diff options
Diffstat (limited to 'drivers/scsi/cxlflash')
| -rw-r--r-- | drivers/scsi/cxlflash/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/Makefile | 5 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/backend.h | 48 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/common.h | 340 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/cxl_hw.c | 177 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/lunmgt.c | 278 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/main.c | 3970 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/main.h | 129 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/ocxl_hw.c | 1399 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/ocxl_hw.h | 72 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/sislite.h | 560 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/superpipe.c | 2220 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/superpipe.h | 153 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/vlun.c | 1337 | ||||
| -rw-r--r-- | drivers/scsi/cxlflash/vlun.h | 82 |
15 files changed, 0 insertions, 10783 deletions
diff --git a/drivers/scsi/cxlflash/Kconfig b/drivers/scsi/cxlflash/Kconfig deleted file mode 100644 index 5533bdcb0458..000000000000 --- a/drivers/scsi/cxlflash/Kconfig +++ /dev/null @@ -1,13 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0-only -# -# IBM CXL-attached Flash Accelerator SCSI Driver -# - -config CXLFLASH - tristate "Support for IBM CAPI Flash" - depends on PCI && SCSI && (CXL || OCXL) && EEH - select IRQ_POLL - default m - help - Allows CAPI Accelerated IO to Flash - If unsure, say N. diff --git a/drivers/scsi/cxlflash/Makefile b/drivers/scsi/cxlflash/Makefile deleted file mode 100644 index fd2f0dd9daf9..000000000000 --- a/drivers/scsi/cxlflash/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -# SPDX-License-Identifier: GPL-2.0-only -obj-$(CONFIG_CXLFLASH) += cxlflash.o -cxlflash-y += main.o superpipe.o lunmgt.o vlun.o -cxlflash-$(CONFIG_CXL) += cxl_hw.o -cxlflash-$(CONFIG_OCXL) += ocxl_hw.o diff --git a/drivers/scsi/cxlflash/backend.h b/drivers/scsi/cxlflash/backend.h deleted file mode 100644 index 181e0445ed42..000000000000 --- a/drivers/scsi/cxlflash/backend.h +++ /dev/null @@ -1,48 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2018 IBM Corporation - */ - -#ifndef _CXLFLASH_BACKEND_H -#define _CXLFLASH_BACKEND_H - -extern const struct cxlflash_backend_ops cxlflash_cxl_ops; -extern const struct cxlflash_backend_ops cxlflash_ocxl_ops; - -struct cxlflash_backend_ops { - struct module *module; - void __iomem * (*psa_map)(void *ctx_cookie); - void (*psa_unmap)(void __iomem *addr); - int (*process_element)(void *ctx_cookie); - int (*map_afu_irq)(void *ctx_cookie, int num, irq_handler_t handler, - void *cookie, char *name); - void (*unmap_afu_irq)(void *ctx_cookie, int num, void *cookie); - u64 (*get_irq_objhndl)(void *ctx_cookie, int irq); - int (*start_context)(void *ctx_cookie); - int (*stop_context)(void *ctx_cookie); - int (*afu_reset)(void *ctx_cookie); - void (*set_master)(void *ctx_cookie); - void * (*get_context)(struct pci_dev *dev, void *afu_cookie); - void * (*dev_context_init)(struct pci_dev *dev, void *afu_cookie); - int (*release_context)(void *ctx_cookie); - void (*perst_reloads_same_image)(void *afu_cookie, bool image); - ssize_t (*read_adapter_vpd)(struct pci_dev *dev, void *buf, - size_t count); - int (*allocate_afu_irqs)(void *ctx_cookie, int num); - void (*free_afu_irqs)(void *ctx_cookie); - void * (*create_afu)(struct pci_dev *dev); - void (*destroy_afu)(void *afu_cookie); - struct file * (*get_fd)(void *ctx_cookie, struct file_operations *fops, - int *fd); - void * (*fops_get_context)(struct file *file); - int (*start_work)(void *ctx_cookie, u64 irqs); - int (*fd_mmap)(struct file *file, struct vm_area_struct *vm); - int (*fd_release)(struct inode *inode, struct file *file); -}; - -#endif /* _CXLFLASH_BACKEND_H */ diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h deleted file mode 100644 index de6229e27b48..000000000000 --- a/drivers/scsi/cxlflash/common.h +++ /dev/null @@ -1,340 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#ifndef _CXLFLASH_COMMON_H -#define _CXLFLASH_COMMON_H - -#include <linux/async.h> -#include <linux/cdev.h> -#include <linux/irq_poll.h> -#include <linux/list.h> -#include <linux/rwsem.h> -#include <linux/types.h> -#include <scsi/scsi.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_device.h> - -#include "backend.h" - -extern const struct file_operations cxlflash_cxl_fops; - -#define MAX_CONTEXT CXLFLASH_MAX_CONTEXT /* num contexts per afu */ -#define MAX_FC_PORTS CXLFLASH_MAX_FC_PORTS /* max ports per AFU */ -#define LEGACY_FC_PORTS 2 /* legacy ports per AFU */ - -#define CHAN2PORTBANK(_x) ((_x) >> ilog2(CXLFLASH_NUM_FC_PORTS_PER_BANK)) -#define CHAN2BANKPORT(_x) ((_x) & (CXLFLASH_NUM_FC_PORTS_PER_BANK - 1)) - -#define CHAN2PORTMASK(_x) (1 << (_x)) /* channel to port mask */ -#define PORTMASK2CHAN(_x) (ilog2((_x))) /* port mask to channel */ -#define PORTNUM2CHAN(_x) ((_x) - 1) /* port number to channel */ - -#define CXLFLASH_BLOCK_SIZE 4096 /* 4K blocks */ -#define CXLFLASH_MAX_XFER_SIZE 16777216 /* 16MB transfer */ -#define CXLFLASH_MAX_SECTORS (CXLFLASH_MAX_XFER_SIZE/512) /* SCSI wants - * max_sectors - * in units of - * 512 byte - * sectors - */ - -#define MAX_RHT_PER_CONTEXT (PAGE_SIZE / sizeof(struct sisl_rht_entry)) - -/* AFU command retry limit */ -#define MC_RETRY_CNT 5 /* Sufficient for SCSI and certain AFU errors */ - -/* Command management definitions */ -#define CXLFLASH_MAX_CMDS 256 -#define CXLFLASH_MAX_CMDS_PER_LUN CXLFLASH_MAX_CMDS - -/* RRQ for master issued cmds */ -#define NUM_RRQ_ENTRY CXLFLASH_MAX_CMDS - -/* SQ for master issued cmds */ -#define NUM_SQ_ENTRY CXLFLASH_MAX_CMDS - -/* Hardware queue definitions */ -#define CXLFLASH_DEF_HWQS 1 -#define CXLFLASH_MAX_HWQS 8 -#define PRIMARY_HWQ 0 - - -static inline void check_sizes(void) -{ - BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_NUM_FC_PORTS_PER_BANK); - BUILD_BUG_ON_NOT_POWER_OF_2(CXLFLASH_MAX_CMDS); -} - -/* AFU defines a fixed size of 4K for command buffers (borrow 4K page define) */ -#define CMD_BUFSIZE SIZE_4K - -enum cxlflash_lr_state { - LINK_RESET_INVALID, - LINK_RESET_REQUIRED, - LINK_RESET_COMPLETE -}; - -enum cxlflash_init_state { - INIT_STATE_NONE, - INIT_STATE_PCI, - INIT_STATE_AFU, - INIT_STATE_SCSI, - INIT_STATE_CDEV -}; - -enum cxlflash_state { - STATE_PROBING, /* Initial state during probe */ - STATE_PROBED, /* Temporary state, probe completed but EEH occurred */ - STATE_NORMAL, /* Normal running state, everything good */ - STATE_RESET, /* Reset state, trying to reset/recover */ - STATE_FAILTERM /* Failed/terminating state, error out users/threads */ -}; - -enum cxlflash_hwq_mode { - HWQ_MODE_RR, /* Roundrobin (default) */ - HWQ_MODE_TAG, /* Distribute based on block MQ tag */ - HWQ_MODE_CPU, /* CPU affinity */ - MAX_HWQ_MODE -}; - -/* - * Each context has its own set of resource handles that is visible - * only from that context. - */ - -struct cxlflash_cfg { - struct afu *afu; - - const struct cxlflash_backend_ops *ops; - struct pci_dev *dev; - struct pci_device_id *dev_id; - struct Scsi_Host *host; - int num_fc_ports; - struct cdev cdev; - struct device *chardev; - - ulong cxlflash_regs_pci; - - struct work_struct work_q; - enum cxlflash_init_state init_state; - enum cxlflash_lr_state lr_state; - int lr_port; - atomic_t scan_host_needed; - - void *afu_cookie; - - atomic_t recovery_threads; - struct mutex ctx_recovery_mutex; - struct mutex ctx_tbl_list_mutex; - struct rw_semaphore ioctl_rwsem; - struct ctx_info *ctx_tbl[MAX_CONTEXT]; - struct list_head ctx_err_recovery; /* contexts w/ recovery pending */ - struct file_operations cxl_fops; - - /* Parameters that are LUN table related */ - int last_lun_index[MAX_FC_PORTS]; - int promote_lun_index; - struct list_head lluns; /* list of llun_info structs */ - - wait_queue_head_t tmf_waitq; - spinlock_t tmf_slock; - bool tmf_active; - bool ws_unmap; /* Write-same unmap supported */ - wait_queue_head_t reset_waitq; - enum cxlflash_state state; - async_cookie_t async_reset_cookie; -}; - -struct afu_cmd { - struct sisl_ioarcb rcb; /* IOARCB (cache line aligned) */ - struct sisl_ioasa sa; /* IOASA must follow IOARCB */ - struct afu *parent; - struct scsi_cmnd *scp; - struct completion cevent; - struct list_head queue; - u32 hwq_index; - - u8 cmd_tmf:1, - cmd_aborted:1; - - struct list_head list; /* Pending commands link */ - - /* As per the SISLITE spec the IOARCB EA has to be 16-byte aligned. - * However for performance reasons the IOARCB/IOASA should be - * cache line aligned. - */ -} __aligned(cache_line_size()); - -static inline struct afu_cmd *sc_to_afuc(struct scsi_cmnd *sc) -{ - return PTR_ALIGN(scsi_cmd_priv(sc), __alignof__(struct afu_cmd)); -} - -static inline struct afu_cmd *sc_to_afuci(struct scsi_cmnd *sc) -{ - struct afu_cmd *afuc = sc_to_afuc(sc); - - INIT_LIST_HEAD(&afuc->queue); - return afuc; -} - -static inline struct afu_cmd *sc_to_afucz(struct scsi_cmnd *sc) -{ - struct afu_cmd *afuc = sc_to_afuc(sc); - - memset(afuc, 0, sizeof(*afuc)); - return sc_to_afuci(sc); -} - -struct hwq { - /* Stuff requiring alignment go first. */ - struct sisl_ioarcb sq[NUM_SQ_ENTRY]; /* 16K SQ */ - u64 rrq_entry[NUM_RRQ_ENTRY]; /* 2K RRQ */ - - /* Beware of alignment till here. Preferably introduce new - * fields after this point - */ - struct afu *afu; - void *ctx_cookie; - struct sisl_host_map __iomem *host_map; /* MC host map */ - struct sisl_ctrl_map __iomem *ctrl_map; /* MC control map */ - ctx_hndl_t ctx_hndl; /* master's context handle */ - u32 index; /* Index of this hwq */ - int num_irqs; /* Number of interrupts requested for context */ - struct list_head pending_cmds; /* Commands pending completion */ - - atomic_t hsq_credits; - spinlock_t hsq_slock; /* Hardware send queue lock */ - struct sisl_ioarcb *hsq_start; - struct sisl_ioarcb *hsq_end; - struct sisl_ioarcb *hsq_curr; - spinlock_t hrrq_slock; - u64 *hrrq_start; - u64 *hrrq_end; - u64 *hrrq_curr; - bool toggle; - bool hrrq_online; - - s64 room; - - struct irq_poll irqpoll; -} __aligned(cache_line_size()); - -struct afu { - struct hwq hwqs[CXLFLASH_MAX_HWQS]; - int (*send_cmd)(struct afu *afu, struct afu_cmd *cmd); - int (*context_reset)(struct hwq *hwq); - - /* AFU HW */ - struct cxlflash_afu_map __iomem *afu_map; /* entire MMIO map */ - - atomic_t cmds_active; /* Number of currently active AFU commands */ - struct mutex sync_active; /* Mutex to serialize AFU commands */ - u64 hb; - u32 internal_lun; /* User-desired LUN mode for this AFU */ - - u32 num_hwqs; /* Number of hardware queues */ - u32 desired_hwqs; /* Desired h/w queues, effective on AFU reset */ - enum cxlflash_hwq_mode hwq_mode; /* Steering mode for h/w queues */ - u32 hwq_rr_count; /* Count to distribute traffic for roundrobin */ - - char version[16]; - u64 interface_version; - - u32 irqpoll_weight; - struct cxlflash_cfg *parent; /* Pointer back to parent cxlflash_cfg */ -}; - -static inline struct hwq *get_hwq(struct afu *afu, u32 index) -{ - WARN_ON(index >= CXLFLASH_MAX_HWQS); - - return &afu->hwqs[index]; -} - -static inline bool afu_is_irqpoll_enabled(struct afu *afu) -{ - return !!afu->irqpoll_weight; -} - -static inline bool afu_has_cap(struct afu *afu, u64 cap) -{ - u64 afu_cap = afu->interface_version >> SISL_INTVER_CAP_SHIFT; - - return afu_cap & cap; -} - -static inline bool afu_is_ocxl_lisn(struct afu *afu) -{ - return afu_has_cap(afu, SISL_INTVER_CAP_OCXL_LISN); -} - -static inline bool afu_is_afu_debug(struct afu *afu) -{ - return afu_has_cap(afu, SISL_INTVER_CAP_AFU_DEBUG); -} - -static inline bool afu_is_lun_provision(struct afu *afu) -{ - return afu_has_cap(afu, SISL_INTVER_CAP_LUN_PROVISION); -} - -static inline bool afu_is_sq_cmd_mode(struct afu *afu) -{ - return afu_has_cap(afu, SISL_INTVER_CAP_SQ_CMD_MODE); -} - -static inline bool afu_is_ioarrin_cmd_mode(struct afu *afu) -{ - return afu_has_cap(afu, SISL_INTVER_CAP_IOARRIN_CMD_MODE); -} - -static inline u64 lun_to_lunid(u64 lun) -{ - __be64 lun_id; - - int_to_scsilun(lun, (struct scsi_lun *)&lun_id); - return be64_to_cpu(lun_id); -} - -static inline struct fc_port_bank __iomem *get_fc_port_bank( - struct cxlflash_cfg *cfg, int i) -{ - struct afu *afu = cfg->afu; - - return &afu->afu_map->global.bank[CHAN2PORTBANK(i)]; -} - -static inline __be64 __iomem *get_fc_port_regs(struct cxlflash_cfg *cfg, int i) -{ - struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i); - - return &fcpb->fc_port_regs[CHAN2BANKPORT(i)][0]; -} - -static inline __be64 __iomem *get_fc_port_luns(struct cxlflash_cfg *cfg, int i) -{ - struct fc_port_bank __iomem *fcpb = get_fc_port_bank(cfg, i); - - return &fcpb->fc_port_luns[CHAN2BANKPORT(i)][0]; -} - -int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t c, res_hndl_t r, u8 mode); -void cxlflash_list_init(void); -void cxlflash_term_global_luns(void); -void cxlflash_free_errpage(void); -int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, - void __user *arg); -void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg); -int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg); -void cxlflash_term_local_luns(struct cxlflash_cfg *cfg); -void cxlflash_restore_luntable(struct cxlflash_cfg *cfg); - -#endif /* ifndef _CXLFLASH_COMMON_H */ diff --git a/drivers/scsi/cxlflash/cxl_hw.c b/drivers/scsi/cxlflash/cxl_hw.c deleted file mode 100644 index b814130f3f5c..000000000000 --- a/drivers/scsi/cxlflash/cxl_hw.c +++ /dev/null @@ -1,177 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2018 IBM Corporation - */ - -#include <misc/cxl.h> - -#include "backend.h" - -/* - * The following routines map the cxlflash backend operations to existing CXL - * kernel API function and are largely simple shims that provide an abstraction - * for converting generic context and AFU cookies into cxl_context or cxl_afu - * pointers. - */ - -static void __iomem *cxlflash_psa_map(void *ctx_cookie) -{ - return cxl_psa_map(ctx_cookie); -} - -static void cxlflash_psa_unmap(void __iomem *addr) -{ - cxl_psa_unmap(addr); -} - -static int cxlflash_process_element(void *ctx_cookie) -{ - return cxl_process_element(ctx_cookie); -} - -static int cxlflash_map_afu_irq(void *ctx_cookie, int num, - irq_handler_t handler, void *cookie, char *name) -{ - return cxl_map_afu_irq(ctx_cookie, num, handler, cookie, name); -} - -static void cxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie) -{ - cxl_unmap_afu_irq(ctx_cookie, num, cookie); -} - -static u64 cxlflash_get_irq_objhndl(void *ctx_cookie, int irq) -{ - /* Dummy fop for cxl */ - return 0; -} - -static int cxlflash_start_context(void *ctx_cookie) -{ - return cxl_start_context(ctx_cookie, 0, NULL); -} - -static int cxlflash_stop_context(void *ctx_cookie) -{ - return cxl_stop_context(ctx_cookie); -} - -static int cxlflash_afu_reset(void *ctx_cookie) -{ - return cxl_afu_reset(ctx_cookie); -} - -static void cxlflash_set_master(void *ctx_cookie) -{ - cxl_set_master(ctx_cookie); -} - -static void *cxlflash_get_context(struct pci_dev *dev, void *afu_cookie) -{ - return cxl_get_context(dev); -} - -static void *cxlflash_dev_context_init(struct pci_dev *dev, void *afu_cookie) -{ - return cxl_dev_context_init(dev); -} - -static int cxlflash_release_context(void *ctx_cookie) -{ - return cxl_release_context(ctx_cookie); -} - -static void cxlflash_perst_reloads_same_image(void *afu_cookie, bool image) -{ - cxl_perst_reloads_same_image(afu_cookie, image); -} - -static ssize_t cxlflash_read_adapter_vpd(struct pci_dev *dev, - void *buf, size_t count) -{ - return cxl_read_adapter_vpd(dev, buf, count); -} - -static int cxlflash_allocate_afu_irqs(void *ctx_cookie, int num) -{ - return cxl_allocate_afu_irqs(ctx_cookie, num); -} - -static void cxlflash_free_afu_irqs(void *ctx_cookie) -{ - cxl_free_afu_irqs(ctx_cookie); -} - -static void *cxlflash_create_afu(struct pci_dev *dev) -{ - return cxl_pci_to_afu(dev); -} - -static void cxlflash_destroy_afu(void *afu) -{ - /* Dummy fop for cxl */ -} - -static struct file *cxlflash_get_fd(void *ctx_cookie, - struct file_operations *fops, int *fd) -{ - return cxl_get_fd(ctx_cookie, fops, fd); -} - -static void *cxlflash_fops_get_context(struct file *file) -{ - return cxl_fops_get_context(file); -} - -static int cxlflash_start_work(void *ctx_cookie, u64 irqs) -{ - struct cxl_ioctl_start_work work = { 0 }; - - work.num_interrupts = irqs; - work.flags = CXL_START_WORK_NUM_IRQS; - - return cxl_start_work(ctx_cookie, &work); -} - -static int cxlflash_fd_mmap(struct file *file, struct vm_area_struct *vm) -{ - return cxl_fd_mmap(file, vm); -} - -static int cxlflash_fd_release(struct inode *inode, struct file *file) -{ - return cxl_fd_release(inode, file); -} - -const struct cxlflash_backend_ops cxlflash_cxl_ops = { - .module = THIS_MODULE, - .psa_map = cxlflash_psa_map, - .psa_unmap = cxlflash_psa_unmap, - .process_element = cxlflash_process_element, - .map_afu_irq = cxlflash_map_afu_irq, - .unmap_afu_irq = cxlflash_unmap_afu_irq, - .get_irq_objhndl = cxlflash_get_irq_objhndl, - .start_context = cxlflash_start_context, - .stop_context = cxlflash_stop_context, - .afu_reset = cxlflash_afu_reset, - .set_master = cxlflash_set_master, - .get_context = cxlflash_get_context, - .dev_context_init = cxlflash_dev_context_init, - .release_context = cxlflash_release_context, - .perst_reloads_same_image = cxlflash_perst_reloads_same_image, - .read_adapter_vpd = cxlflash_read_adapter_vpd, - .allocate_afu_irqs = cxlflash_allocate_afu_irqs, - .free_afu_irqs = cxlflash_free_afu_irqs, - .create_afu = cxlflash_create_afu, - .destroy_afu = cxlflash_destroy_afu, - .get_fd = cxlflash_get_fd, - .fops_get_context = cxlflash_fops_get_context, - .start_work = cxlflash_start_work, - .fd_mmap = cxlflash_fd_mmap, - .fd_release = cxlflash_fd_release, -}; diff --git a/drivers/scsi/cxlflash/lunmgt.c b/drivers/scsi/cxlflash/lunmgt.c deleted file mode 100644 index e0e15b44a2e6..000000000000 --- a/drivers/scsi/cxlflash/lunmgt.c +++ /dev/null @@ -1,278 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#include <asm/unaligned.h> - -#include <linux/interrupt.h> -#include <linux/pci.h> - -#include <scsi/scsi_host.h> -#include <uapi/scsi/cxlflash_ioctl.h> - -#include "sislite.h" -#include "common.h" -#include "vlun.h" -#include "superpipe.h" - -/** - * create_local() - allocate and initialize a local LUN information structure - * @sdev: SCSI device associated with LUN. - * @wwid: World Wide Node Name for LUN. - * - * Return: Allocated local llun_info structure on success, NULL on failure - */ -static struct llun_info *create_local(struct scsi_device *sdev, u8 *wwid) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = NULL; - - lli = kzalloc(sizeof(*lli), GFP_KERNEL); - if (unlikely(!lli)) { - dev_err(dev, "%s: could not allocate lli\n", __func__); - goto out; - } - - lli->sdev = sdev; - lli->host_no = sdev->host->host_no; - lli->in_table = false; - - memcpy(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN); -out: - return lli; -} - -/** - * create_global() - allocate and initialize a global LUN information structure - * @sdev: SCSI device associated with LUN. - * @wwid: World Wide Node Name for LUN. - * - * Return: Allocated global glun_info structure on success, NULL on failure - */ -static struct glun_info *create_global(struct scsi_device *sdev, u8 *wwid) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct glun_info *gli = NULL; - - gli = kzalloc(sizeof(*gli), GFP_KERNEL); - if (unlikely(!gli)) { - dev_err(dev, "%s: could not allocate gli\n", __func__); - goto out; - } - - mutex_init(&gli->mutex); - memcpy(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN); -out: - return gli; -} - -/** - * lookup_local() - find a local LUN information structure by WWID - * @cfg: Internal structure associated with the host. - * @wwid: WWID associated with LUN. - * - * Return: Found local lun_info structure on success, NULL on failure - */ -static struct llun_info *lookup_local(struct cxlflash_cfg *cfg, u8 *wwid) -{ - struct llun_info *lli, *temp; - - list_for_each_entry_safe(lli, temp, &cfg->lluns, list) - if (!memcmp(lli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN)) - return lli; - - return NULL; -} - -/** - * lookup_global() - find a global LUN information structure by WWID - * @wwid: WWID associated with LUN. - * - * Return: Found global lun_info structure on success, NULL on failure - */ -static struct glun_info *lookup_global(u8 *wwid) -{ - struct glun_info *gli, *temp; - - list_for_each_entry_safe(gli, temp, &global.gluns, list) - if (!memcmp(gli->wwid, wwid, DK_CXLFLASH_MANAGE_LUN_WWID_LEN)) - return gli; - - return NULL; -} - -/** - * find_and_create_lun() - find or create a local LUN information structure - * @sdev: SCSI device associated with LUN. - * @wwid: WWID associated with LUN. - * - * The LUN is kept both in a local list (per adapter) and in a global list - * (across all adapters). Certain attributes of the LUN are local to the - * adapter (such as index, port selection mask, etc.). - * - * The block allocation map is shared across all adapters (i.e. associated - * wih the global list). Since different attributes are associated with - * the per adapter and global entries, allocate two separate structures for each - * LUN (one local, one global). - * - * Keep a pointer back from the local to the global entry. - * - * This routine assumes the caller holds the global mutex. - * - * Return: Found/Allocated local lun_info structure on success, NULL on failure - */ -static struct llun_info *find_and_create_lun(struct scsi_device *sdev, u8 *wwid) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = NULL; - struct glun_info *gli = NULL; - - if (unlikely(!wwid)) - goto out; - - lli = lookup_local(cfg, wwid); - if (lli) - goto out; - - lli = create_local(sdev, wwid); - if (unlikely(!lli)) - goto out; - - gli = lookup_global(wwid); - if (gli) { - lli->parent = gli; - list_add(&lli->list, &cfg->lluns); - goto out; - } - - gli = create_global(sdev, wwid); - if (unlikely(!gli)) { - kfree(lli); - lli = NULL; - goto out; - } - - lli->parent = gli; - list_add(&lli->list, &cfg->lluns); - - list_add(&gli->list, &global.gluns); - -out: - dev_dbg(dev, "%s: returning lli=%p, gli=%p\n", __func__, lli, gli); - return lli; -} - -/** - * cxlflash_term_local_luns() - Delete all entries from local LUN list, free. - * @cfg: Internal structure associated with the host. - */ -void cxlflash_term_local_luns(struct cxlflash_cfg *cfg) -{ - struct llun_info *lli, *temp; - - mutex_lock(&global.mutex); - list_for_each_entry_safe(lli, temp, &cfg->lluns, list) { - list_del(&lli->list); - kfree(lli); - } - mutex_unlock(&global.mutex); -} - -/** - * cxlflash_list_init() - initializes the global LUN list - */ -void cxlflash_list_init(void) -{ - INIT_LIST_HEAD(&global.gluns); - mutex_init(&global.mutex); - global.err_page = NULL; -} - -/** - * cxlflash_term_global_luns() - frees resources associated with global LUN list - */ -void cxlflash_term_global_luns(void) -{ - struct glun_info *gli, *temp; - - mutex_lock(&global.mutex); - list_for_each_entry_safe(gli, temp, &global.gluns, list) { - list_del(&gli->list); - cxlflash_ba_terminate(&gli->blka.ba_lun); - kfree(gli); - } - mutex_unlock(&global.mutex); -} - -/** - * cxlflash_manage_lun() - handles LUN management activities - * @sdev: SCSI device associated with LUN. - * @manage: Manage ioctl data structure. - * - * This routine is used to notify the driver about a LUN's WWID and associate - * SCSI devices (sdev) with a global LUN instance. Additionally it serves to - * change a LUN's operating mode: legacy or superpipe. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_manage_lun(struct scsi_device *sdev, - struct dk_cxlflash_manage_lun *manage) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = NULL; - int rc = 0; - u64 flags = manage->hdr.flags; - u32 chan = sdev->channel; - - mutex_lock(&global.mutex); - lli = find_and_create_lun(sdev, manage->wwid); - dev_dbg(dev, "%s: WWID=%016llx%016llx, flags=%016llx lli=%p\n", - __func__, get_unaligned_be64(&manage->wwid[0]), - get_unaligned_be64(&manage->wwid[8]), manage->hdr.flags, lli); - if (unlikely(!lli)) { - rc = -ENOMEM; - goto out; - } - - if (flags & DK_CXLFLASH_MANAGE_LUN_ENABLE_SUPERPIPE) { - /* - * Update port selection mask based upon channel, store off LUN - * in unpacked, AFU-friendly format, and hang LUN reference in - * the sdev. - */ - lli->port_sel |= CHAN2PORTMASK(chan); - lli->lun_id[chan] = lun_to_lunid(sdev->lun); - sdev->hostdata = lli; - } else if (flags & DK_CXLFLASH_MANAGE_LUN_DISABLE_SUPERPIPE) { - if (lli->parent->mode != MODE_NONE) - rc = -EBUSY; - else { - /* - * Clean up local LUN for this port and reset table - * tracking when no more references exist. - */ - sdev->hostdata = NULL; - lli->port_sel &= ~CHAN2PORTMASK(chan); - if (lli->port_sel == 0U) - lli->in_table = false; - } - } - - dev_dbg(dev, "%s: port_sel=%08x chan=%u lun_id=%016llx\n", - __func__, lli->port_sel, chan, lli->lun_id[chan]); - -out: - mutex_unlock(&global.mutex); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c deleted file mode 100644 index e8382cc5cf23..000000000000 --- a/drivers/scsi/cxlflash/main.c +++ /dev/null @@ -1,3970 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#include <linux/delay.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/pci.h> - -#include <asm/unaligned.h> - -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_host.h> -#include <uapi/scsi/cxlflash_ioctl.h> - -#include "main.h" -#include "sislite.h" -#include "common.h" - -MODULE_DESCRIPTION(CXLFLASH_ADAPTER_NAME); -MODULE_AUTHOR("Manoj N. Kumar <manoj@linux.vnet.ibm.com>"); -MODULE_AUTHOR("Matthew R. Ochs <mrochs@linux.vnet.ibm.com>"); -MODULE_LICENSE("GPL"); - -static char *cxlflash_devnode(const struct device *dev, umode_t *mode); -static const struct class cxlflash_class = { - .name = "cxlflash", - .devnode = cxlflash_devnode, -}; - -static u32 cxlflash_major; -static DECLARE_BITMAP(cxlflash_minor, CXLFLASH_MAX_ADAPTERS); - -/** - * process_cmd_err() - command error handler - * @cmd: AFU command that experienced the error. - * @scp: SCSI command associated with the AFU command in error. - * - * Translates error bits from AFU command to SCSI command results. - */ -static void process_cmd_err(struct afu_cmd *cmd, struct scsi_cmnd *scp) -{ - struct afu *afu = cmd->parent; - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct sisl_ioasa *ioasa; - u32 resid; - - ioasa = &(cmd->sa); - - if (ioasa->rc.flags & SISL_RC_FLAGS_UNDERRUN) { - resid = ioasa->resid; - scsi_set_resid(scp, resid); - dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p, resid = %d\n", - __func__, cmd, scp, resid); - } - - if (ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN) { - dev_dbg(dev, "%s: cmd underrun cmd = %p scp = %p\n", - __func__, cmd, scp); - scp->result = (DID_ERROR << 16); - } - - dev_dbg(dev, "%s: cmd failed afu_rc=%02x scsi_rc=%02x fc_rc=%02x " - "afu_extra=%02x scsi_extra=%02x fc_extra=%02x\n", __func__, - ioasa->rc.afu_rc, ioasa->rc.scsi_rc, ioasa->rc.fc_rc, - ioasa->afu_extra, ioasa->scsi_extra, ioasa->fc_extra); - - if (ioasa->rc.scsi_rc) { - /* We have a SCSI status */ - if (ioasa->rc.flags & SISL_RC_FLAGS_SENSE_VALID) { - memcpy(scp->sense_buffer, ioasa->sense_data, - SISL_SENSE_DATA_LEN); - scp->result = ioasa->rc.scsi_rc; - } else - scp->result = ioasa->rc.scsi_rc | (DID_ERROR << 16); - } - - /* - * We encountered an error. Set scp->result based on nature - * of error. - */ - if (ioasa->rc.fc_rc) { - /* We have an FC status */ - switch (ioasa->rc.fc_rc) { - case SISL_FC_RC_LINKDOWN: - scp->result = (DID_REQUEUE << 16); - break; - case SISL_FC_RC_RESID: - /* This indicates an FCP resid underrun */ - if (!(ioasa->rc.flags & SISL_RC_FLAGS_OVERRUN)) { - /* If the SISL_RC_FLAGS_OVERRUN flag was set, - * then we will handle this error else where. - * If not then we must handle it here. - * This is probably an AFU bug. - */ - scp->result = (DID_ERROR << 16); - } - break; - case SISL_FC_RC_RESIDERR: - /* Resid mismatch between adapter and device */ - case SISL_FC_RC_TGTABORT: - case SISL_FC_RC_ABORTOK: - case SISL_FC_RC_ABORTFAIL: - case SISL_FC_RC_NOLOGI: - case SISL_FC_RC_ABORTPEND: - case SISL_FC_RC_WRABORTPEND: - case SISL_FC_RC_NOEXP: - case SISL_FC_RC_INUSE: - scp->result = (DID_ERROR << 16); - break; - } - } - - if (ioasa->rc.afu_rc) { - /* We have an AFU error */ - switch (ioasa->rc.afu_rc) { - case SISL_AFU_RC_NO_CHANNELS: - scp->result = (DID_NO_CONNECT << 16); - break; - case SISL_AFU_RC_DATA_DMA_ERR: - switch (ioasa->afu_extra) { - case SISL_AFU_DMA_ERR_PAGE_IN: - /* Retry */ - scp->result = (DID_IMM_RETRY << 16); - break; - case SISL_AFU_DMA_ERR_INVALID_EA: - default: - scp->result = (DID_ERROR << 16); - } - break; - case SISL_AFU_RC_OUT_OF_DATA_BUFS: - /* Retry */ - scp->result = (DID_ERROR << 16); - break; - default: - scp->result = (DID_ERROR << 16); - } - } -} - -/** - * cmd_complete() - command completion handler - * @cmd: AFU command that has completed. - * - * For SCSI commands this routine prepares and submits commands that have - * either completed or timed out to the SCSI stack. For internal commands - * (TMF or AFU), this routine simply notifies the originator that the - * command has completed. - */ -static void cmd_complete(struct afu_cmd *cmd) -{ - struct scsi_cmnd *scp; - ulong lock_flags; - struct afu *afu = cmd->parent; - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq = get_hwq(afu, cmd->hwq_index); - - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - list_del(&cmd->list); - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); - - if (cmd->scp) { - scp = cmd->scp; - if (unlikely(cmd->sa.ioasc)) - process_cmd_err(cmd, scp); - else - scp->result = (DID_OK << 16); - - dev_dbg_ratelimited(dev, "%s:scp=%p result=%08x ioasc=%08x\n", - __func__, scp, scp->result, cmd->sa.ioasc); - scsi_done(scp); - } else if (cmd->cmd_tmf) { - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - cfg->tmf_active = false; - wake_up_all_locked(&cfg->tmf_waitq); - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - } else - complete(&cmd->cevent); -} - -/** - * flush_pending_cmds() - flush all pending commands on this hardware queue - * @hwq: Hardware queue to flush. - * - * The hardware send queue lock associated with this hardware queue must be - * held when calling this routine. - */ -static void flush_pending_cmds(struct hwq *hwq) -{ - struct cxlflash_cfg *cfg = hwq->afu->parent; - struct afu_cmd *cmd, *tmp; - struct scsi_cmnd *scp; - ulong lock_flags; - - list_for_each_entry_safe(cmd, tmp, &hwq->pending_cmds, list) { - /* Bypass command when on a doneq, cmd_complete() will handle */ - if (!list_empty(&cmd->queue)) - continue; - - list_del(&cmd->list); - - if (cmd->scp) { - scp = cmd->scp; - scp->result = (DID_IMM_RETRY << 16); - scsi_done(scp); - } else { - cmd->cmd_aborted = true; - - if (cmd->cmd_tmf) { - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - cfg->tmf_active = false; - wake_up_all_locked(&cfg->tmf_waitq); - spin_unlock_irqrestore(&cfg->tmf_slock, - lock_flags); - } else - complete(&cmd->cevent); - } - } -} - -/** - * context_reset() - reset context via specified register - * @hwq: Hardware queue owning the context to be reset. - * @reset_reg: MMIO register to perform reset. - * - * When the reset is successful, the SISLite specification guarantees that - * the AFU has aborted all currently pending I/O. Accordingly, these commands - * must be flushed. - * - * Return: 0 on success, -errno on failure - */ -static int context_reset(struct hwq *hwq, __be64 __iomem *reset_reg) -{ - struct cxlflash_cfg *cfg = hwq->afu->parent; - struct device *dev = &cfg->dev->dev; - int rc = -ETIMEDOUT; - int nretry = 0; - u64 val = 0x1; - ulong lock_flags; - - dev_dbg(dev, "%s: hwq=%p\n", __func__, hwq); - - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - - writeq_be(val, reset_reg); - do { - val = readq_be(reset_reg); - if ((val & 0x1) == 0x0) { - rc = 0; - break; - } - - /* Double delay each time */ - udelay(1 << nretry); - } while (nretry++ < MC_ROOM_RETRY_CNT); - - if (!rc) - flush_pending_cmds(hwq); - - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); - - dev_dbg(dev, "%s: returning rc=%d, val=%016llx nretry=%d\n", - __func__, rc, val, nretry); - return rc; -} - -/** - * context_reset_ioarrin() - reset context via IOARRIN register - * @hwq: Hardware queue owning the context to be reset. - * - * Return: 0 on success, -errno on failure - */ -static int context_reset_ioarrin(struct hwq *hwq) -{ - return context_reset(hwq, &hwq->host_map->ioarrin); -} - -/** - * context_reset_sq() - reset context via SQ_CONTEXT_RESET register - * @hwq: Hardware queue owning the context to be reset. - * - * Return: 0 on success, -errno on failure - */ -static int context_reset_sq(struct hwq *hwq) -{ - return context_reset(hwq, &hwq->host_map->sq_ctx_reset); -} - -/** - * send_cmd_ioarrin() - sends an AFU command via IOARRIN register - * @afu: AFU associated with the host. - * @cmd: AFU command to send. - * - * Return: - * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure - */ -static int send_cmd_ioarrin(struct afu *afu, struct afu_cmd *cmd) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq = get_hwq(afu, cmd->hwq_index); - int rc = 0; - s64 room; - ulong lock_flags; - - /* - * To avoid the performance penalty of MMIO, spread the update of - * 'room' over multiple commands. - */ - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - if (--hwq->room < 0) { - room = readq_be(&hwq->host_map->cmd_room); - if (room <= 0) { - dev_dbg_ratelimited(dev, "%s: no cmd_room to send " - "0x%02X, room=0x%016llX\n", - __func__, cmd->rcb.cdb[0], room); - hwq->room = 0; - rc = SCSI_MLQUEUE_HOST_BUSY; - goto out; - } - hwq->room = room - 1; - } - - list_add(&cmd->list, &hwq->pending_cmds); - writeq_be((u64)&cmd->rcb, &hwq->host_map->ioarrin); -out: - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); - dev_dbg_ratelimited(dev, "%s: cmd=%p len=%u ea=%016llx rc=%d\n", - __func__, cmd, cmd->rcb.data_len, cmd->rcb.data_ea, rc); - return rc; -} - -/** - * send_cmd_sq() - sends an AFU command via SQ ring - * @afu: AFU associated with the host. - * @cmd: AFU command to send. - * - * Return: - * 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure - */ -static int send_cmd_sq(struct afu *afu, struct afu_cmd *cmd) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq = get_hwq(afu, cmd->hwq_index); - int rc = 0; - int newval; - ulong lock_flags; - - newval = atomic_dec_if_positive(&hwq->hsq_credits); - if (newval <= 0) { - rc = SCSI_MLQUEUE_HOST_BUSY; - goto out; - } - - cmd->rcb.ioasa = &cmd->sa; - - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - - *hwq->hsq_curr = cmd->rcb; - if (hwq->hsq_curr < hwq->hsq_end) - hwq->hsq_curr++; - else - hwq->hsq_curr = hwq->hsq_start; - - list_add(&cmd->list, &hwq->pending_cmds); - writeq_be((u64)hwq->hsq_curr, &hwq->host_map->sq_tail); - - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); -out: - dev_dbg(dev, "%s: cmd=%p len=%u ea=%016llx ioasa=%p rc=%d curr=%p " - "head=%016llx tail=%016llx\n", __func__, cmd, cmd->rcb.data_len, - cmd->rcb.data_ea, cmd->rcb.ioasa, rc, hwq->hsq_curr, - readq_be(&hwq->host_map->sq_head), - readq_be(&hwq->host_map->sq_tail)); - return rc; -} - -/** - * wait_resp() - polls for a response or timeout to a sent AFU command - * @afu: AFU associated with the host. - * @cmd: AFU command that was sent. - * - * Return: 0 on success, -errno on failure - */ -static int wait_resp(struct afu *afu, struct afu_cmd *cmd) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - int rc = 0; - ulong timeout = msecs_to_jiffies(cmd->rcb.timeout * 2 * 1000); - - timeout = wait_for_completion_timeout(&cmd->cevent, timeout); - if (!timeout) - rc = -ETIMEDOUT; - - if (cmd->cmd_aborted) - rc = -EAGAIN; - - if (unlikely(cmd->sa.ioasc != 0)) { - dev_err(dev, "%s: cmd %02x failed, ioasc=%08x\n", - __func__, cmd->rcb.cdb[0], cmd->sa.ioasc); - rc = -EIO; - } - - return rc; -} - -/** - * cmd_to_target_hwq() - selects a target hardware queue for a SCSI command - * @host: SCSI host associated with device. - * @scp: SCSI command to send. - * @afu: SCSI command to send. - * - * Hashes a command based upon the hardware queue mode. - * - * Return: Trusted index of target hardware queue - */ -static u32 cmd_to_target_hwq(struct Scsi_Host *host, struct scsi_cmnd *scp, - struct afu *afu) -{ - u32 tag; - u32 hwq = 0; - - if (afu->num_hwqs == 1) - return 0; - - switch (afu->hwq_mode) { - case HWQ_MODE_RR: - hwq = afu->hwq_rr_count++ % afu->num_hwqs; - break; - case HWQ_MODE_TAG: - tag = blk_mq_unique_tag(scsi_cmd_to_rq(scp)); - hwq = blk_mq_unique_tag_to_hwq(tag); - break; - case HWQ_MODE_CPU: - hwq = smp_processor_id() % afu->num_hwqs; - break; - default: - WARN_ON_ONCE(1); - } - - return hwq; -} - -/** - * send_tmf() - sends a Task Management Function (TMF) - * @cfg: Internal structure associated with the host. - * @sdev: SCSI device destined for TMF. - * @tmfcmd: TMF command to send. - * - * Return: - * 0 on success, SCSI_MLQUEUE_HOST_BUSY or -errno on failure - */ -static int send_tmf(struct cxlflash_cfg *cfg, struct scsi_device *sdev, - u64 tmfcmd) -{ - struct afu *afu = cfg->afu; - struct afu_cmd *cmd = NULL; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); - bool needs_deletion = false; - char *buf = NULL; - ulong lock_flags; - int rc = 0; - ulong to; - - buf = kzalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); - if (unlikely(!buf)) { - dev_err(dev, "%s: no memory for command\n", __func__); - rc = -ENOMEM; - goto out; - } - - cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); - INIT_LIST_HEAD(&cmd->queue); - - /* When Task Management Function is active do not send another */ - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - if (cfg->tmf_active) - wait_event_interruptible_lock_irq(cfg->tmf_waitq, - !cfg->tmf_active, - cfg->tmf_slock); - cfg->tmf_active = true; - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - - cmd->parent = afu; - cmd->cmd_tmf = true; - cmd->hwq_index = hwq->index; - - cmd->rcb.ctx_id = hwq->ctx_hndl; - cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; - cmd->rcb.port_sel = CHAN2PORTMASK(sdev->channel); - cmd->rcb.lun_id = lun_to_lunid(sdev->lun); - cmd->rcb.req_flags = (SISL_REQ_FLAGS_PORT_LUN_ID | - SISL_REQ_FLAGS_SUP_UNDERRUN | - SISL_REQ_FLAGS_TMF_CMD); - memcpy(cmd->rcb.cdb, &tmfcmd, sizeof(tmfcmd)); - - rc = afu->send_cmd(afu, cmd); - if (unlikely(rc)) { - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - cfg->tmf_active = false; - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - goto out; - } - - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - to = msecs_to_jiffies(5000); - to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq, - !cfg->tmf_active, - cfg->tmf_slock, - to); - if (!to) { - dev_err(dev, "%s: TMF timed out\n", __func__); - rc = -ETIMEDOUT; - needs_deletion = true; - } else if (cmd->cmd_aborted) { - dev_err(dev, "%s: TMF aborted\n", __func__); - rc = -EAGAIN; - } else if (cmd->sa.ioasc) { - dev_err(dev, "%s: TMF failed ioasc=%08x\n", - __func__, cmd->sa.ioasc); - rc = -EIO; - } - cfg->tmf_active = false; - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - - if (needs_deletion) { - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - list_del(&cmd->list); - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); - } -out: - kfree(buf); - return rc; -} - -/** - * cxlflash_driver_info() - information handler for this host driver - * @host: SCSI host associated with device. - * - * Return: A string describing the device. - */ -static const char *cxlflash_driver_info(struct Scsi_Host *host) -{ - return CXLFLASH_ADAPTER_NAME; -} - -/** - * cxlflash_queuecommand() - sends a mid-layer request - * @host: SCSI host associated with device. - * @scp: SCSI command to send. - * - * Return: 0 on success, SCSI_MLQUEUE_HOST_BUSY on failure - */ -static int cxlflash_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scp) -{ - struct cxlflash_cfg *cfg = shost_priv(host); - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct afu_cmd *cmd = sc_to_afuci(scp); - struct scatterlist *sg = scsi_sglist(scp); - int hwq_index = cmd_to_target_hwq(host, scp, afu); - struct hwq *hwq = get_hwq(afu, hwq_index); - u16 req_flags = SISL_REQ_FLAGS_SUP_UNDERRUN; - ulong lock_flags; - int rc = 0; - - dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu " - "cdb=(%08x-%08x-%08x-%08x)\n", - __func__, scp, host->host_no, scp->device->channel, - scp->device->id, scp->device->lun, - get_unaligned_be32(&((u32 *)scp->cmnd)[0]), - get_unaligned_be32(&((u32 *)scp->cmnd)[1]), - get_unaligned_be32(&((u32 *)scp->cmnd)[2]), - get_unaligned_be32(&((u32 *)scp->cmnd)[3])); - - /* - * If a Task Management Function is active, wait for it to complete - * before continuing with regular commands. - */ - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - if (cfg->tmf_active) { - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - rc = SCSI_MLQUEUE_HOST_BUSY; - goto out; - } - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - - switch (cfg->state) { - case STATE_PROBING: - case STATE_PROBED: - case STATE_RESET: - dev_dbg_ratelimited(dev, "%s: device is in reset\n", __func__); - rc = SCSI_MLQUEUE_HOST_BUSY; - goto out; - case STATE_FAILTERM: - dev_dbg_ratelimited(dev, "%s: device has failed\n", __func__); - scp->result = (DID_NO_CONNECT << 16); - scsi_done(scp); - rc = 0; - goto out; - default: - atomic_inc(&afu->cmds_active); - break; - } - - if (likely(sg)) { - cmd->rcb.data_len = sg->length; - cmd->rcb.data_ea = (uintptr_t)sg_virt(sg); - } - - cmd->scp = scp; - cmd->parent = afu; - cmd->hwq_index = hwq_index; - - cmd->sa.ioasc = 0; - cmd->rcb.ctx_id = hwq->ctx_hndl; - cmd->rcb.msi = SISL_MSI_RRQ_UPDATED; - cmd->rcb.port_sel = CHAN2PORTMASK(scp->device->channel); - cmd->rcb.lun_id = lun_to_lunid(scp->device->lun); - - if (scp->sc_data_direction == DMA_TO_DEVICE) - req_flags |= SISL_REQ_FLAGS_HOST_WRITE; - - cmd->rcb.req_flags = req_flags; - memcpy(cmd->rcb.cdb, scp->cmnd, sizeof(cmd->rcb.cdb)); - - rc = afu->send_cmd(afu, cmd); - atomic_dec(&afu->cmds_active); -out: - return rc; -} - -/** - * cxlflash_wait_for_pci_err_recovery() - wait for error recovery during probe - * @cfg: Internal structure associated with the host. - */ -static void cxlflash_wait_for_pci_err_recovery(struct cxlflash_cfg *cfg) -{ - struct pci_dev *pdev = cfg->dev; - - if (pci_channel_offline(pdev)) - wait_event_timeout(cfg->reset_waitq, - !pci_channel_offline(pdev), - CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT); -} - -/** - * free_mem() - free memory associated with the AFU - * @cfg: Internal structure associated with the host. - */ -static void free_mem(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - - if (cfg->afu) { - free_pages((ulong)afu, get_order(sizeof(struct afu))); - cfg->afu = NULL; - } -} - -/** - * cxlflash_reset_sync() - synchronizing point for asynchronous resets - * @cfg: Internal structure associated with the host. - */ -static void cxlflash_reset_sync(struct cxlflash_cfg *cfg) -{ - if (cfg->async_reset_cookie == 0) - return; - - /* Wait until all async calls prior to this cookie have completed */ - async_synchronize_cookie(cfg->async_reset_cookie + 1); - cfg->async_reset_cookie = 0; -} - -/** - * stop_afu() - stops the AFU command timers and unmaps the MMIO space - * @cfg: Internal structure associated with the host. - * - * Safe to call with AFU in a partially allocated/initialized state. - * - * Cancels scheduled worker threads, waits for any active internal AFU - * commands to timeout, disables IRQ polling and then unmaps the MMIO space. - */ -static void stop_afu(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - struct hwq *hwq; - int i; - - cancel_work_sync(&cfg->work_q); - if (!current_is_async()) - cxlflash_reset_sync(cfg); - - if (likely(afu)) { - while (atomic_read(&afu->cmds_active)) - ssleep(1); - - if (afu_is_irqpoll_enabled(afu)) { - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - irq_poll_disable(&hwq->irqpoll); - } - } - - if (likely(afu->afu_map)) { - cfg->ops->psa_unmap(afu->afu_map); - afu->afu_map = NULL; - } - } -} - -/** - * term_intr() - disables all AFU interrupts - * @cfg: Internal structure associated with the host. - * @level: Depth of allocation, where to begin waterfall tear down. - * @index: Index of the hardware queue. - * - * Safe to call with AFU/MC in partially allocated/initialized state. - */ -static void term_intr(struct cxlflash_cfg *cfg, enum undo_level level, - u32 index) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq; - - if (!afu) { - dev_err(dev, "%s: returning with NULL afu\n", __func__); - return; - } - - hwq = get_hwq(afu, index); - - if (!hwq->ctx_cookie) { - dev_err(dev, "%s: returning with NULL MC\n", __func__); - return; - } - - switch (level) { - case UNMAP_THREE: - /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */ - if (index == PRIMARY_HWQ) - cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 3, hwq); - fallthrough; - case UNMAP_TWO: - cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 2, hwq); - fallthrough; - case UNMAP_ONE: - cfg->ops->unmap_afu_irq(hwq->ctx_cookie, 1, hwq); - fallthrough; - case FREE_IRQ: - cfg->ops->free_afu_irqs(hwq->ctx_cookie); - fallthrough; - case UNDO_NOOP: - /* No action required */ - break; - } -} - -/** - * term_mc() - terminates the master context - * @cfg: Internal structure associated with the host. - * @index: Index of the hardware queue. - * - * Safe to call with AFU/MC in partially allocated/initialized state. - */ -static void term_mc(struct cxlflash_cfg *cfg, u32 index) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq; - ulong lock_flags; - - if (!afu) { - dev_err(dev, "%s: returning with NULL afu\n", __func__); - return; - } - - hwq = get_hwq(afu, index); - - if (!hwq->ctx_cookie) { - dev_err(dev, "%s: returning with NULL MC\n", __func__); - return; - } - - WARN_ON(cfg->ops->stop_context(hwq->ctx_cookie)); - if (index != PRIMARY_HWQ) - WARN_ON(cfg->ops->release_context(hwq->ctx_cookie)); - hwq->ctx_cookie = NULL; - - spin_lock_irqsave(&hwq->hrrq_slock, lock_flags); - hwq->hrrq_online = false; - spin_unlock_irqrestore(&hwq->hrrq_slock, lock_flags); - - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - flush_pending_cmds(hwq); - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); -} - -/** - * term_afu() - terminates the AFU - * @cfg: Internal structure associated with the host. - * - * Safe to call with AFU/MC in partially allocated/initialized state. - */ -static void term_afu(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - int k; - - /* - * Tear down is carefully orchestrated to ensure - * no interrupts can come in when the problem state - * area is unmapped. - * - * 1) Disable all AFU interrupts for each master - * 2) Unmap the problem state area - * 3) Stop each master context - */ - for (k = cfg->afu->num_hwqs - 1; k >= 0; k--) - term_intr(cfg, UNMAP_THREE, k); - - stop_afu(cfg); - - for (k = cfg->afu->num_hwqs - 1; k >= 0; k--) - term_mc(cfg, k); - - dev_dbg(dev, "%s: returning\n", __func__); -} - -/** - * notify_shutdown() - notifies device of pending shutdown - * @cfg: Internal structure associated with the host. - * @wait: Whether to wait for shutdown processing to complete. - * - * This function will notify the AFU that the adapter is being shutdown - * and will wait for shutdown processing to complete if wait is true. - * This notification should flush pending I/Os to the device and halt - * further I/Os until the next AFU reset is issued and device restarted. - */ -static void notify_shutdown(struct cxlflash_cfg *cfg, bool wait) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct dev_dependent_vals *ddv; - __be64 __iomem *fc_port_regs; - u64 reg, status; - int i, retry_cnt = 0; - - ddv = (struct dev_dependent_vals *)cfg->dev_id->driver_data; - if (!(ddv->flags & CXLFLASH_NOTIFY_SHUTDOWN)) - return; - - if (!afu || !afu->afu_map) { - dev_dbg(dev, "%s: Problem state area not mapped\n", __func__); - return; - } - - /* Notify AFU */ - for (i = 0; i < cfg->num_fc_ports; i++) { - fc_port_regs = get_fc_port_regs(cfg, i); - - reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]); - reg |= SISL_FC_SHUTDOWN_NORMAL; - writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]); - } - - if (!wait) - return; - - /* Wait up to 1.5 seconds for shutdown processing to complete */ - for (i = 0; i < cfg->num_fc_ports; i++) { - fc_port_regs = get_fc_port_regs(cfg, i); - retry_cnt = 0; - - while (true) { - status = readq_be(&fc_port_regs[FC_STATUS / 8]); - if (status & SISL_STATUS_SHUTDOWN_COMPLETE) - break; - if (++retry_cnt >= MC_RETRY_CNT) { - dev_dbg(dev, "%s: port %d shutdown processing " - "not yet completed\n", __func__, i); - break; - } - msleep(100 * retry_cnt); - } - } -} - -/** - * cxlflash_get_minor() - gets the first available minor number - * - * Return: Unique minor number that can be used to create the character device. - */ -static int cxlflash_get_minor(void) -{ - int minor; - long bit; - - bit = find_first_zero_bit(cxlflash_minor, CXLFLASH_MAX_ADAPTERS); - if (bit >= CXLFLASH_MAX_ADAPTERS) - return -1; - - minor = bit & MINORMASK; - set_bit(minor, cxlflash_minor); - return minor; -} - -/** - * cxlflash_put_minor() - releases the minor number - * @minor: Minor number that is no longer needed. - */ -static void cxlflash_put_minor(int minor) -{ - clear_bit(minor, cxlflash_minor); -} - -/** - * cxlflash_release_chrdev() - release the character device for the host - * @cfg: Internal structure associated with the host. - */ -static void cxlflash_release_chrdev(struct cxlflash_cfg *cfg) -{ - device_unregister(cfg->chardev); - cfg->chardev = NULL; - cdev_del(&cfg->cdev); - cxlflash_put_minor(MINOR(cfg->cdev.dev)); -} - -/** - * cxlflash_remove() - PCI entry point to tear down host - * @pdev: PCI device associated with the host. - * - * Safe to use as a cleanup in partially allocated/initialized state. Note that - * the reset_waitq is flushed as part of the stop/termination of user contexts. - */ -static void cxlflash_remove(struct pci_dev *pdev) -{ - struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); - struct device *dev = &pdev->dev; - ulong lock_flags; - - if (!pci_is_enabled(pdev)) { - dev_dbg(dev, "%s: Device is disabled\n", __func__); - return; - } - - /* Yield to running recovery threads before continuing with remove */ - wait_event(cfg->reset_waitq, cfg->state != STATE_RESET && - cfg->state != STATE_PROBING); - spin_lock_irqsave(&cfg->tmf_slock, lock_flags); - if (cfg->tmf_active) - wait_event_interruptible_lock_irq(cfg->tmf_waitq, - !cfg->tmf_active, - cfg->tmf_slock); - spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags); - - /* Notify AFU and wait for shutdown processing to complete */ - notify_shutdown(cfg, true); - - cfg->state = STATE_FAILTERM; - cxlflash_stop_term_user_contexts(cfg); - - switch (cfg->init_state) { - case INIT_STATE_CDEV: - cxlflash_release_chrdev(cfg); - fallthrough; - case INIT_STATE_SCSI: - cxlflash_term_local_luns(cfg); - scsi_remove_host(cfg->host); - fallthrough; - case INIT_STATE_AFU: - term_afu(cfg); - fallthrough; - case INIT_STATE_PCI: - cfg->ops->destroy_afu(cfg->afu_cookie); - pci_disable_device(pdev); - fallthrough; - case INIT_STATE_NONE: - free_mem(cfg); - scsi_host_put(cfg->host); - break; - } - - dev_dbg(dev, "%s: returning\n", __func__); -} - -/** - * alloc_mem() - allocates the AFU and its command pool - * @cfg: Internal structure associated with the host. - * - * A partially allocated state remains on failure. - * - * Return: - * 0 on success - * -ENOMEM on failure to allocate memory - */ -static int alloc_mem(struct cxlflash_cfg *cfg) -{ - int rc = 0; - struct device *dev = &cfg->dev->dev; - - /* AFU is ~28k, i.e. only one 64k page or up to seven 4k pages */ - cfg->afu = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, - get_order(sizeof(struct afu))); - if (unlikely(!cfg->afu)) { - dev_err(dev, "%s: cannot get %d free pages\n", - __func__, get_order(sizeof(struct afu))); - rc = -ENOMEM; - goto out; - } - cfg->afu->parent = cfg; - cfg->afu->desired_hwqs = CXLFLASH_DEF_HWQS; - cfg->afu->afu_map = NULL; -out: - return rc; -} - -/** - * init_pci() - initializes the host as a PCI device - * @cfg: Internal structure associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int init_pci(struct cxlflash_cfg *cfg) -{ - struct pci_dev *pdev = cfg->dev; - struct device *dev = &cfg->dev->dev; - int rc = 0; - - rc = pci_enable_device(pdev); - if (rc || pci_channel_offline(pdev)) { - if (pci_channel_offline(pdev)) { - cxlflash_wait_for_pci_err_recovery(cfg); - rc = pci_enable_device(pdev); - } - - if (rc) { - dev_err(dev, "%s: Cannot enable adapter\n", __func__); - cxlflash_wait_for_pci_err_recovery(cfg); - goto out; - } - } - -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * init_scsi() - adds the host to the SCSI stack and kicks off host scan - * @cfg: Internal structure associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int init_scsi(struct cxlflash_cfg *cfg) -{ - struct pci_dev *pdev = cfg->dev; - struct device *dev = &cfg->dev->dev; - int rc = 0; - - rc = scsi_add_host(cfg->host, &pdev->dev); - if (rc) { - dev_err(dev, "%s: scsi_add_host failed rc=%d\n", __func__, rc); - goto out; - } - - scsi_scan_host(cfg->host); - -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * set_port_online() - transitions the specified host FC port to online state - * @fc_regs: Top of MMIO region defined for specified port. - * - * The provided MMIO region must be mapped prior to call. Online state means - * that the FC link layer has synced, completed the handshaking process, and - * is ready for login to start. - */ -static void set_port_online(__be64 __iomem *fc_regs) -{ - u64 cmdcfg; - - cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); - cmdcfg &= (~FC_MTIP_CMDCONFIG_OFFLINE); /* clear OFF_LINE */ - cmdcfg |= (FC_MTIP_CMDCONFIG_ONLINE); /* set ON_LINE */ - writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); -} - -/** - * set_port_offline() - transitions the specified host FC port to offline state - * @fc_regs: Top of MMIO region defined for specified port. - * - * The provided MMIO region must be mapped prior to call. - */ -static void set_port_offline(__be64 __iomem *fc_regs) -{ - u64 cmdcfg; - - cmdcfg = readq_be(&fc_regs[FC_MTIP_CMDCONFIG / 8]); - cmdcfg &= (~FC_MTIP_CMDCONFIG_ONLINE); /* clear ON_LINE */ - cmdcfg |= (FC_MTIP_CMDCONFIG_OFFLINE); /* set OFF_LINE */ - writeq_be(cmdcfg, &fc_regs[FC_MTIP_CMDCONFIG / 8]); -} - -/** - * wait_port_online() - waits for the specified host FC port come online - * @fc_regs: Top of MMIO region defined for specified port. - * @delay_us: Number of microseconds to delay between reading port status. - * @nretry: Number of cycles to retry reading port status. - * - * The provided MMIO region must be mapped prior to call. This will timeout - * when the cable is not plugged in. - * - * Return: - * TRUE (1) when the specified port is online - * FALSE (0) when the specified port fails to come online after timeout - */ -static bool wait_port_online(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) -{ - u64 status; - - WARN_ON(delay_us < 1000); - - do { - msleep(delay_us / 1000); - status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); - if (status == U64_MAX) - nretry /= 2; - } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_ONLINE && - nretry--); - - return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_ONLINE); -} - -/** - * wait_port_offline() - waits for the specified host FC port go offline - * @fc_regs: Top of MMIO region defined for specified port. - * @delay_us: Number of microseconds to delay between reading port status. - * @nretry: Number of cycles to retry reading port status. - * - * The provided MMIO region must be mapped prior to call. - * - * Return: - * TRUE (1) when the specified port is offline - * FALSE (0) when the specified port fails to go offline after timeout - */ -static bool wait_port_offline(__be64 __iomem *fc_regs, u32 delay_us, u32 nretry) -{ - u64 status; - - WARN_ON(delay_us < 1000); - - do { - msleep(delay_us / 1000); - status = readq_be(&fc_regs[FC_MTIP_STATUS / 8]); - if (status == U64_MAX) - nretry /= 2; - } while ((status & FC_MTIP_STATUS_MASK) != FC_MTIP_STATUS_OFFLINE && - nretry--); - - return ((status & FC_MTIP_STATUS_MASK) == FC_MTIP_STATUS_OFFLINE); -} - -/** - * afu_set_wwpn() - configures the WWPN for the specified host FC port - * @afu: AFU associated with the host that owns the specified FC port. - * @port: Port number being configured. - * @fc_regs: Top of MMIO region defined for specified port. - * @wwpn: The world-wide-port-number previously discovered for port. - * - * The provided MMIO region must be mapped prior to call. As part of the - * sequence to configure the WWPN, the port is toggled offline and then back - * online. This toggling action can cause this routine to delay up to a few - * seconds. When configured to use the internal LUN feature of the AFU, a - * failure to come online is overridden. - */ -static void afu_set_wwpn(struct afu *afu, int port, __be64 __iomem *fc_regs, - u64 wwpn) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - - set_port_offline(fc_regs); - if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, - FC_PORT_STATUS_RETRY_CNT)) { - dev_dbg(dev, "%s: wait on port %d to go offline timed out\n", - __func__, port); - } - - writeq_be(wwpn, &fc_regs[FC_PNAME / 8]); - - set_port_online(fc_regs); - if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, - FC_PORT_STATUS_RETRY_CNT)) { - dev_dbg(dev, "%s: wait on port %d to go online timed out\n", - __func__, port); - } -} - -/** - * afu_link_reset() - resets the specified host FC port - * @afu: AFU associated with the host that owns the specified FC port. - * @port: Port number being configured. - * @fc_regs: Top of MMIO region defined for specified port. - * - * The provided MMIO region must be mapped prior to call. The sequence to - * reset the port involves toggling it offline and then back online. This - * action can cause this routine to delay up to a few seconds. An effort - * is made to maintain link with the device by switching to host to use - * the alternate port exclusively while the reset takes place. - * failure to come online is overridden. - */ -static void afu_link_reset(struct afu *afu, int port, __be64 __iomem *fc_regs) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - u64 port_sel; - - /* first switch the AFU to the other links, if any */ - port_sel = readq_be(&afu->afu_map->global.regs.afu_port_sel); - port_sel &= ~(1ULL << port); - writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); - cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); - - set_port_offline(fc_regs); - if (!wait_port_offline(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, - FC_PORT_STATUS_RETRY_CNT)) - dev_err(dev, "%s: wait on port %d to go offline timed out\n", - __func__, port); - - set_port_online(fc_regs); - if (!wait_port_online(fc_regs, FC_PORT_STATUS_RETRY_INTERVAL_US, - FC_PORT_STATUS_RETRY_CNT)) - dev_err(dev, "%s: wait on port %d to go online timed out\n", - __func__, port); - - /* switch back to include this port */ - port_sel |= (1ULL << port); - writeq_be(port_sel, &afu->afu_map->global.regs.afu_port_sel); - cxlflash_afu_sync(afu, 0, 0, AFU_GSYNC); - - dev_dbg(dev, "%s: returning port_sel=%016llx\n", __func__, port_sel); -} - -/** - * afu_err_intr_init() - clears and initializes the AFU for error interrupts - * @afu: AFU associated with the host. - */ -static void afu_err_intr_init(struct afu *afu) -{ - struct cxlflash_cfg *cfg = afu->parent; - __be64 __iomem *fc_port_regs; - int i; - struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); - u64 reg; - - /* global async interrupts: AFU clears afu_ctrl on context exit - * if async interrupts were sent to that context. This prevents - * the AFU form sending further async interrupts when - * there is - * nobody to receive them. - */ - - /* mask all */ - writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_mask); - /* set LISN# to send and point to primary master context */ - reg = ((u64) (((hwq->ctx_hndl << 8) | SISL_MSI_ASYNC_ERROR)) << 40); - - if (afu->internal_lun) - reg |= 1; /* Bit 63 indicates local lun */ - writeq_be(reg, &afu->afu_map->global.regs.afu_ctrl); - /* clear all */ - writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); - /* unmask bits that are of interest */ - /* note: afu can send an interrupt after this step */ - writeq_be(SISL_ASTATUS_MASK, &afu->afu_map->global.regs.aintr_mask); - /* clear again in case a bit came on after previous clear but before */ - /* unmask */ - writeq_be(-1ULL, &afu->afu_map->global.regs.aintr_clear); - - /* Clear/Set internal lun bits */ - fc_port_regs = get_fc_port_regs(cfg, 0); - reg = readq_be(&fc_port_regs[FC_CONFIG2 / 8]); - reg &= SISL_FC_INTERNAL_MASK; - if (afu->internal_lun) - reg |= ((u64)(afu->internal_lun - 1) << SISL_FC_INTERNAL_SHIFT); - writeq_be(reg, &fc_port_regs[FC_CONFIG2 / 8]); - - /* now clear FC errors */ - for (i = 0; i < cfg->num_fc_ports; i++) { - fc_port_regs = get_fc_port_regs(cfg, i); - - writeq_be(0xFFFFFFFFU, &fc_port_regs[FC_ERROR / 8]); - writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]); - } - - /* sync interrupts for master's IOARRIN write */ - /* note that unlike asyncs, there can be no pending sync interrupts */ - /* at this time (this is a fresh context and master has not written */ - /* IOARRIN yet), so there is nothing to clear. */ - - /* set LISN#, it is always sent to the context that wrote IOARRIN */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - reg = readq_be(&hwq->host_map->ctx_ctrl); - WARN_ON((reg & SISL_CTX_CTRL_LISN_MASK) != 0); - reg |= SISL_MSI_SYNC_ERROR; - writeq_be(reg, &hwq->host_map->ctx_ctrl); - writeq_be(SISL_ISTATUS_MASK, &hwq->host_map->intr_mask); - } -} - -/** - * cxlflash_sync_err_irq() - interrupt handler for synchronous errors - * @irq: Interrupt number. - * @data: Private data provided at interrupt registration, the AFU. - * - * Return: Always return IRQ_HANDLED. - */ -static irqreturn_t cxlflash_sync_err_irq(int irq, void *data) -{ - struct hwq *hwq = (struct hwq *)data; - struct cxlflash_cfg *cfg = hwq->afu->parent; - struct device *dev = &cfg->dev->dev; - u64 reg; - u64 reg_unmasked; - - reg = readq_be(&hwq->host_map->intr_status); - reg_unmasked = (reg & SISL_ISTATUS_UNMASK); - - if (reg_unmasked == 0UL) { - dev_err(dev, "%s: spurious interrupt, intr_status=%016llx\n", - __func__, reg); - goto cxlflash_sync_err_irq_exit; - } - - dev_err(dev, "%s: unexpected interrupt, intr_status=%016llx\n", - __func__, reg); - - writeq_be(reg_unmasked, &hwq->host_map->intr_clear); - -cxlflash_sync_err_irq_exit: - return IRQ_HANDLED; -} - -/** - * process_hrrq() - process the read-response queue - * @hwq: HWQ associated with the host. - * @doneq: Queue of commands harvested from the RRQ. - * @budget: Threshold of RRQ entries to process. - * - * This routine must be called holding the disabled RRQ spin lock. - * - * Return: The number of entries processed. - */ -static int process_hrrq(struct hwq *hwq, struct list_head *doneq, int budget) -{ - struct afu *afu = hwq->afu; - struct afu_cmd *cmd; - struct sisl_ioasa *ioasa; - struct sisl_ioarcb *ioarcb; - bool toggle = hwq->toggle; - int num_hrrq = 0; - u64 entry, - *hrrq_start = hwq->hrrq_start, - *hrrq_end = hwq->hrrq_end, - *hrrq_curr = hwq->hrrq_curr; - - /* Process ready RRQ entries up to the specified budget (if any) */ - while (true) { - entry = *hrrq_curr; - - if ((entry & SISL_RESP_HANDLE_T_BIT) != toggle) - break; - - entry &= ~SISL_RESP_HANDLE_T_BIT; - - if (afu_is_sq_cmd_mode(afu)) { - ioasa = (struct sisl_ioasa *)entry; - cmd = container_of(ioasa, struct afu_cmd, sa); - } else { - ioarcb = (struct sisl_ioarcb *)entry; - cmd = container_of(ioarcb, struct afu_cmd, rcb); - } - - list_add_tail(&cmd->queue, doneq); - - /* Advance to next entry or wrap and flip the toggle bit */ - if (hrrq_curr < hrrq_end) - hrrq_curr++; - else { - hrrq_curr = hrrq_start; - toggle ^= SISL_RESP_HANDLE_T_BIT; - } - - atomic_inc(&hwq->hsq_credits); - num_hrrq++; - - if (budget > 0 && num_hrrq >= budget) - break; - } - - hwq->hrrq_curr = hrrq_curr; - hwq->toggle = toggle; - - return num_hrrq; -} - -/** - * process_cmd_doneq() - process a queue of harvested RRQ commands - * @doneq: Queue of completed commands. - * - * Note that upon return the queue can no longer be trusted. - */ -static void process_cmd_doneq(struct list_head *doneq) -{ - struct afu_cmd *cmd, *tmp; - - WARN_ON(list_empty(doneq)); - - list_for_each_entry_safe(cmd, tmp, doneq, queue) - cmd_complete(cmd); -} - -/** - * cxlflash_irqpoll() - process a queue of harvested RRQ commands - * @irqpoll: IRQ poll structure associated with queue to poll. - * @budget: Threshold of RRQ entries to process per poll. - * - * Return: The number of entries processed. - */ -static int cxlflash_irqpoll(struct irq_poll *irqpoll, int budget) -{ - struct hwq *hwq = container_of(irqpoll, struct hwq, irqpoll); - unsigned long hrrq_flags; - LIST_HEAD(doneq); - int num_entries = 0; - - spin_lock_irqsave(&hwq->hrrq_slock, hrrq_flags); - - num_entries = process_hrrq(hwq, &doneq, budget); - if (num_entries < budget) - irq_poll_complete(irqpoll); - - spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); - - process_cmd_doneq(&doneq); - return num_entries; -} - -/** - * cxlflash_rrq_irq() - interrupt handler for read-response queue (normal path) - * @irq: Interrupt number. - * @data: Private data provided at interrupt registration, the AFU. - * - * Return: IRQ_HANDLED or IRQ_NONE when no ready entries found. - */ -static irqreturn_t cxlflash_rrq_irq(int irq, void *data) -{ - struct hwq *hwq = (struct hwq *)data; - struct afu *afu = hwq->afu; - unsigned long hrrq_flags; - LIST_HEAD(doneq); - int num_entries = 0; - - spin_lock_irqsave(&hwq->hrrq_slock, hrrq_flags); - - /* Silently drop spurious interrupts when queue is not online */ - if (!hwq->hrrq_online) { - spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); - return IRQ_HANDLED; - } - - if (afu_is_irqpoll_enabled(afu)) { - irq_poll_sched(&hwq->irqpoll); - spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); - return IRQ_HANDLED; - } - - num_entries = process_hrrq(hwq, &doneq, -1); - spin_unlock_irqrestore(&hwq->hrrq_slock, hrrq_flags); - - if (num_entries == 0) - return IRQ_NONE; - - process_cmd_doneq(&doneq); - return IRQ_HANDLED; -} - -/* - * Asynchronous interrupt information table - * - * NOTE: - * - Order matters here as this array is indexed by bit position. - * - * - The checkpatch script considers the BUILD_SISL_ASTATUS_FC_PORT macro - * as complex and complains due to a lack of parentheses/braces. - */ -#define ASTATUS_FC(_a, _b, _c, _d) \ - { SISL_ASTATUS_FC##_a##_##_b, _c, _a, (_d) } - -#define BUILD_SISL_ASTATUS_FC_PORT(_a) \ - ASTATUS_FC(_a, LINK_UP, "link up", 0), \ - ASTATUS_FC(_a, LINK_DN, "link down", 0), \ - ASTATUS_FC(_a, LOGI_S, "login succeeded", SCAN_HOST), \ - ASTATUS_FC(_a, LOGI_F, "login failed", CLR_FC_ERROR), \ - ASTATUS_FC(_a, LOGI_R, "login timed out, retrying", LINK_RESET), \ - ASTATUS_FC(_a, CRC_T, "CRC threshold exceeded", LINK_RESET), \ - ASTATUS_FC(_a, LOGO, "target initiated LOGO", 0), \ - ASTATUS_FC(_a, OTHER, "other error", CLR_FC_ERROR | LINK_RESET) - -static const struct asyc_intr_info ainfo[] = { - BUILD_SISL_ASTATUS_FC_PORT(1), - BUILD_SISL_ASTATUS_FC_PORT(0), - BUILD_SISL_ASTATUS_FC_PORT(3), - BUILD_SISL_ASTATUS_FC_PORT(2) -}; - -/** - * cxlflash_async_err_irq() - interrupt handler for asynchronous errors - * @irq: Interrupt number. - * @data: Private data provided at interrupt registration, the AFU. - * - * Return: Always return IRQ_HANDLED. - */ -static irqreturn_t cxlflash_async_err_irq(int irq, void *data) -{ - struct hwq *hwq = (struct hwq *)data; - struct afu *afu = hwq->afu; - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - const struct asyc_intr_info *info; - struct sisl_global_map __iomem *global = &afu->afu_map->global; - __be64 __iomem *fc_port_regs; - u64 reg_unmasked; - u64 reg; - u64 bit; - u8 port; - - reg = readq_be(&global->regs.aintr_status); - reg_unmasked = (reg & SISL_ASTATUS_UNMASK); - - if (unlikely(reg_unmasked == 0)) { - dev_err(dev, "%s: spurious interrupt, aintr_status=%016llx\n", - __func__, reg); - goto out; - } - - /* FYI, it is 'okay' to clear AFU status before FC_ERROR */ - writeq_be(reg_unmasked, &global->regs.aintr_clear); - - /* Check each bit that is on */ - for_each_set_bit(bit, (ulong *)®_unmasked, BITS_PER_LONG) { - if (unlikely(bit >= ARRAY_SIZE(ainfo))) { - WARN_ON_ONCE(1); - continue; - } - - info = &ainfo[bit]; - if (unlikely(info->status != 1ULL << bit)) { - WARN_ON_ONCE(1); - continue; - } - - port = info->port; - fc_port_regs = get_fc_port_regs(cfg, port); - - dev_err(dev, "%s: FC Port %d -> %s, fc_status=%016llx\n", - __func__, port, info->desc, - readq_be(&fc_port_regs[FC_STATUS / 8])); - - /* - * Do link reset first, some OTHER errors will set FC_ERROR - * again if cleared before or w/o a reset - */ - if (info->action & LINK_RESET) { - dev_err(dev, "%s: FC Port %d: resetting link\n", - __func__, port); - cfg->lr_state = LINK_RESET_REQUIRED; - cfg->lr_port = port; - schedule_work(&cfg->work_q); - } - - if (info->action & CLR_FC_ERROR) { - reg = readq_be(&fc_port_regs[FC_ERROR / 8]); - - /* - * Since all errors are unmasked, FC_ERROR and FC_ERRCAP - * should be the same and tracing one is sufficient. - */ - - dev_err(dev, "%s: fc %d: clearing fc_error=%016llx\n", - __func__, port, reg); - - writeq_be(reg, &fc_port_regs[FC_ERROR / 8]); - writeq_be(0, &fc_port_regs[FC_ERRCAP / 8]); - } - - if (info->action & SCAN_HOST) { - atomic_inc(&cfg->scan_host_needed); - schedule_work(&cfg->work_q); - } - } - -out: - return IRQ_HANDLED; -} - -/** - * read_vpd() - obtains the WWPNs from VPD - * @cfg: Internal structure associated with the host. - * @wwpn: Array of size MAX_FC_PORTS to pass back WWPNs - * - * Return: 0 on success, -errno on failure - */ -static int read_vpd(struct cxlflash_cfg *cfg, u64 wwpn[]) -{ - struct device *dev = &cfg->dev->dev; - struct pci_dev *pdev = cfg->dev; - int i, k, rc = 0; - unsigned int kw_size; - ssize_t vpd_size; - char vpd_data[CXLFLASH_VPD_LEN]; - char tmp_buf[WWPN_BUF_LEN] = { 0 }; - const struct dev_dependent_vals *ddv = (struct dev_dependent_vals *) - cfg->dev_id->driver_data; - const bool wwpn_vpd_required = ddv->flags & CXLFLASH_WWPN_VPD_REQUIRED; - const char *wwpn_vpd_tags[MAX_FC_PORTS] = { "V5", "V6", "V7", "V8" }; - - /* Get the VPD data from the device */ - vpd_size = cfg->ops->read_adapter_vpd(pdev, vpd_data, sizeof(vpd_data)); - if (unlikely(vpd_size <= 0)) { - dev_err(dev, "%s: Unable to read VPD (size = %ld)\n", - __func__, vpd_size); - rc = -ENODEV; - goto out; - } - - /* - * Find the offset of the WWPN tag within the read only - * VPD data and validate the found field (partials are - * no good to us). Convert the ASCII data to an integer - * value. Note that we must copy to a temporary buffer - * because the conversion service requires that the ASCII - * string be terminated. - * - * Allow for WWPN not being found for all devices, setting - * the returned WWPN to zero when not found. Notify with a - * log error for cards that should have had WWPN keywords - * in the VPD - cards requiring WWPN will not have their - * ports programmed and operate in an undefined state. - */ - for (k = 0; k < cfg->num_fc_ports; k++) { - i = pci_vpd_find_ro_info_keyword(vpd_data, vpd_size, - wwpn_vpd_tags[k], &kw_size); - if (i == -ENOENT) { - if (wwpn_vpd_required) - dev_err(dev, "%s: Port %d WWPN not found\n", - __func__, k); - wwpn[k] = 0ULL; - continue; - } - - if (i < 0 || kw_size != WWPN_LEN) { - dev_err(dev, "%s: Port %d WWPN incomplete or bad VPD\n", - __func__, k); - rc = -ENODEV; - goto out; - } - - memcpy(tmp_buf, &vpd_data[i], WWPN_LEN); - rc = kstrtoul(tmp_buf, WWPN_LEN, (ulong *)&wwpn[k]); - if (unlikely(rc)) { - dev_err(dev, "%s: WWPN conversion failed for port %d\n", - __func__, k); - rc = -ENODEV; - goto out; - } - - dev_dbg(dev, "%s: wwpn%d=%016llx\n", __func__, k, wwpn[k]); - } - -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * init_pcr() - initialize the provisioning and control registers - * @cfg: Internal structure associated with the host. - * - * Also sets up fast access to the mapped registers and initializes AFU - * command fields that never change. - */ -static void init_pcr(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - struct sisl_ctrl_map __iomem *ctrl_map; - struct hwq *hwq; - void *cookie; - int i; - - for (i = 0; i < MAX_CONTEXT; i++) { - ctrl_map = &afu->afu_map->ctrls[i].ctrl; - /* Disrupt any clients that could be running */ - /* e.g. clients that survived a master restart */ - writeq_be(0, &ctrl_map->rht_start); - writeq_be(0, &ctrl_map->rht_cnt_id); - writeq_be(0, &ctrl_map->ctx_cap); - } - - /* Copy frequently used fields into hwq */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - cookie = hwq->ctx_cookie; - - hwq->ctx_hndl = (u16) cfg->ops->process_element(cookie); - hwq->host_map = &afu->afu_map->hosts[hwq->ctx_hndl].host; - hwq->ctrl_map = &afu->afu_map->ctrls[hwq->ctx_hndl].ctrl; - - /* Program the Endian Control for the master context */ - writeq_be(SISL_ENDIAN_CTRL, &hwq->host_map->endian_ctrl); - } -} - -/** - * init_global() - initialize AFU global registers - * @cfg: Internal structure associated with the host. - */ -static int init_global(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq; - struct sisl_host_map __iomem *hmap; - __be64 __iomem *fc_port_regs; - u64 wwpn[MAX_FC_PORTS]; /* wwpn of AFU ports */ - int i = 0, num_ports = 0; - int rc = 0; - int j; - void *ctx; - u64 reg; - - rc = read_vpd(cfg, &wwpn[0]); - if (rc) { - dev_err(dev, "%s: could not read vpd rc=%d\n", __func__, rc); - goto out; - } - - /* Set up RRQ and SQ in HWQ for master issued cmds */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - hmap = hwq->host_map; - - writeq_be((u64) hwq->hrrq_start, &hmap->rrq_start); - writeq_be((u64) hwq->hrrq_end, &hmap->rrq_end); - hwq->hrrq_online = true; - - if (afu_is_sq_cmd_mode(afu)) { - writeq_be((u64)hwq->hsq_start, &hmap->sq_start); - writeq_be((u64)hwq->hsq_end, &hmap->sq_end); - } - } - - /* AFU configuration */ - reg = readq_be(&afu->afu_map->global.regs.afu_config); - reg |= SISL_AFUCONF_AR_ALL|SISL_AFUCONF_ENDIAN; - /* enable all auto retry options and control endianness */ - /* leave others at default: */ - /* CTX_CAP write protected, mbox_r does not clear on read and */ - /* checker on if dual afu */ - writeq_be(reg, &afu->afu_map->global.regs.afu_config); - - /* Global port select: select either port */ - if (afu->internal_lun) { - /* Only use port 0 */ - writeq_be(PORT0, &afu->afu_map->global.regs.afu_port_sel); - num_ports = 0; - } else { - writeq_be(PORT_MASK(cfg->num_fc_ports), - &afu->afu_map->global.regs.afu_port_sel); - num_ports = cfg->num_fc_ports; - } - - for (i = 0; i < num_ports; i++) { - fc_port_regs = get_fc_port_regs(cfg, i); - - /* Unmask all errors (but they are still masked at AFU) */ - writeq_be(0, &fc_port_regs[FC_ERRMSK / 8]); - /* Clear CRC error cnt & set a threshold */ - (void)readq_be(&fc_port_regs[FC_CNT_CRCERR / 8]); - writeq_be(MC_CRC_THRESH, &fc_port_regs[FC_CRC_THRESH / 8]); - - /* Set WWPNs. If already programmed, wwpn[i] is 0 */ - if (wwpn[i] != 0) - afu_set_wwpn(afu, i, &fc_port_regs[0], wwpn[i]); - /* Programming WWPN back to back causes additional - * offline/online transitions and a PLOGI - */ - msleep(100); - } - - if (afu_is_ocxl_lisn(afu)) { - /* Set up the LISN effective address for each master */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - ctx = hwq->ctx_cookie; - - for (j = 0; j < hwq->num_irqs; j++) { - reg = cfg->ops->get_irq_objhndl(ctx, j); - writeq_be(reg, &hwq->ctrl_map->lisn_ea[j]); - } - - reg = hwq->ctx_hndl; - writeq_be(SISL_LISN_PASID(reg, reg), - &hwq->ctrl_map->lisn_pasid[0]); - writeq_be(SISL_LISN_PASID(0UL, reg), - &hwq->ctrl_map->lisn_pasid[1]); - } - } - - /* Set up master's own CTX_CAP to allow real mode, host translation */ - /* tables, afu cmds and read/write GSCSI cmds. */ - /* First, unlock ctx_cap write by reading mbox */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - (void)readq_be(&hwq->ctrl_map->mbox_r); /* unlock ctx_cap */ - writeq_be((SISL_CTX_CAP_REAL_MODE | SISL_CTX_CAP_HOST_XLATE | - SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD | - SISL_CTX_CAP_AFU_CMD | SISL_CTX_CAP_GSCSI_CMD), - &hwq->ctrl_map->ctx_cap); - } - - /* - * Determine write-same unmap support for host by evaluating the unmap - * sector support bit of the context control register associated with - * the primary hardware queue. Note that while this status is reflected - * in a context register, the outcome can be assumed to be host-wide. - */ - hwq = get_hwq(afu, PRIMARY_HWQ); - reg = readq_be(&hwq->host_map->ctx_ctrl); - if (reg & SISL_CTX_CTRL_UNMAP_SECTOR) - cfg->ws_unmap = true; - - /* Initialize heartbeat */ - afu->hb = readq_be(&afu->afu_map->global.regs.afu_hb); -out: - return rc; -} - -/** - * start_afu() - initializes and starts the AFU - * @cfg: Internal structure associated with the host. - */ -static int start_afu(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq; - int rc = 0; - int i; - - init_pcr(cfg); - - /* Initialize each HWQ */ - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - /* After an AFU reset, RRQ entries are stale, clear them */ - memset(&hwq->rrq_entry, 0, sizeof(hwq->rrq_entry)); - - /* Initialize RRQ pointers */ - hwq->hrrq_start = &hwq->rrq_entry[0]; - hwq->hrrq_end = &hwq->rrq_entry[NUM_RRQ_ENTRY - 1]; - hwq->hrrq_curr = hwq->hrrq_start; - hwq->toggle = 1; - - /* Initialize spin locks */ - spin_lock_init(&hwq->hrrq_slock); - spin_lock_init(&hwq->hsq_slock); - - /* Initialize SQ */ - if (afu_is_sq_cmd_mode(afu)) { - memset(&hwq->sq, 0, sizeof(hwq->sq)); - hwq->hsq_start = &hwq->sq[0]; - hwq->hsq_end = &hwq->sq[NUM_SQ_ENTRY - 1]; - hwq->hsq_curr = hwq->hsq_start; - - atomic_set(&hwq->hsq_credits, NUM_SQ_ENTRY - 1); - } - - /* Initialize IRQ poll */ - if (afu_is_irqpoll_enabled(afu)) - irq_poll_init(&hwq->irqpoll, afu->irqpoll_weight, - cxlflash_irqpoll); - - } - - rc = init_global(cfg); - - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * init_intr() - setup interrupt handlers for the master context - * @cfg: Internal structure associated with the host. - * @hwq: Hardware queue to initialize. - * - * Return: 0 on success, -errno on failure - */ -static enum undo_level init_intr(struct cxlflash_cfg *cfg, - struct hwq *hwq) -{ - struct device *dev = &cfg->dev->dev; - void *ctx = hwq->ctx_cookie; - int rc = 0; - enum undo_level level = UNDO_NOOP; - bool is_primary_hwq = (hwq->index == PRIMARY_HWQ); - int num_irqs = hwq->num_irqs; - - rc = cfg->ops->allocate_afu_irqs(ctx, num_irqs); - if (unlikely(rc)) { - dev_err(dev, "%s: allocate_afu_irqs failed rc=%d\n", - __func__, rc); - level = UNDO_NOOP; - goto out; - } - - rc = cfg->ops->map_afu_irq(ctx, 1, cxlflash_sync_err_irq, hwq, - "SISL_MSI_SYNC_ERROR"); - if (unlikely(rc <= 0)) { - dev_err(dev, "%s: SISL_MSI_SYNC_ERROR map failed\n", __func__); - level = FREE_IRQ; - goto out; - } - - rc = cfg->ops->map_afu_irq(ctx, 2, cxlflash_rrq_irq, hwq, - "SISL_MSI_RRQ_UPDATED"); - if (unlikely(rc <= 0)) { - dev_err(dev, "%s: SISL_MSI_RRQ_UPDATED map failed\n", __func__); - level = UNMAP_ONE; - goto out; - } - - /* SISL_MSI_ASYNC_ERROR is setup only for the primary HWQ */ - if (!is_primary_hwq) - goto out; - - rc = cfg->ops->map_afu_irq(ctx, 3, cxlflash_async_err_irq, hwq, - "SISL_MSI_ASYNC_ERROR"); - if (unlikely(rc <= 0)) { - dev_err(dev, "%s: SISL_MSI_ASYNC_ERROR map failed\n", __func__); - level = UNMAP_TWO; - goto out; - } -out: - return level; -} - -/** - * init_mc() - create and register as the master context - * @cfg: Internal structure associated with the host. - * @index: HWQ Index of the master context. - * - * Return: 0 on success, -errno on failure - */ -static int init_mc(struct cxlflash_cfg *cfg, u32 index) -{ - void *ctx; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq = get_hwq(cfg->afu, index); - int rc = 0; - int num_irqs; - enum undo_level level; - - hwq->afu = cfg->afu; - hwq->index = index; - INIT_LIST_HEAD(&hwq->pending_cmds); - - if (index == PRIMARY_HWQ) { - ctx = cfg->ops->get_context(cfg->dev, cfg->afu_cookie); - num_irqs = 3; - } else { - ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie); - num_irqs = 2; - } - if (IS_ERR_OR_NULL(ctx)) { - rc = -ENOMEM; - goto err1; - } - - WARN_ON(hwq->ctx_cookie); - hwq->ctx_cookie = ctx; - hwq->num_irqs = num_irqs; - - /* Set it up as a master with the CXL */ - cfg->ops->set_master(ctx); - - /* Reset AFU when initializing primary context */ - if (index == PRIMARY_HWQ) { - rc = cfg->ops->afu_reset(ctx); - if (unlikely(rc)) { - dev_err(dev, "%s: AFU reset failed rc=%d\n", - __func__, rc); - goto err1; - } - } - - level = init_intr(cfg, hwq); - if (unlikely(level)) { - dev_err(dev, "%s: interrupt init failed rc=%d\n", __func__, rc); - goto err2; - } - - /* Finally, activate the context by starting it */ - rc = cfg->ops->start_context(hwq->ctx_cookie); - if (unlikely(rc)) { - dev_err(dev, "%s: start context failed rc=%d\n", __func__, rc); - level = UNMAP_THREE; - goto err2; - } - -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -err2: - term_intr(cfg, level, index); - if (index != PRIMARY_HWQ) - cfg->ops->release_context(ctx); -err1: - hwq->ctx_cookie = NULL; - goto out; -} - -/** - * get_num_afu_ports() - determines and configures the number of AFU ports - * @cfg: Internal structure associated with the host. - * - * This routine determines the number of AFU ports by converting the global - * port selection mask. The converted value is only valid following an AFU - * reset (explicit or power-on). This routine must be invoked shortly after - * mapping as other routines are dependent on the number of ports during the - * initialization sequence. - * - * To support legacy AFUs that might not have reflected an initial global - * port mask (value read is 0), default to the number of ports originally - * supported by the cxlflash driver (2) before hardware with other port - * offerings was introduced. - */ -static void get_num_afu_ports(struct cxlflash_cfg *cfg) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - u64 port_mask; - int num_fc_ports = LEGACY_FC_PORTS; - - port_mask = readq_be(&afu->afu_map->global.regs.afu_port_sel); - if (port_mask != 0ULL) - num_fc_ports = min(ilog2(port_mask) + 1, MAX_FC_PORTS); - - dev_dbg(dev, "%s: port_mask=%016llx num_fc_ports=%d\n", - __func__, port_mask, num_fc_ports); - - cfg->num_fc_ports = num_fc_ports; - cfg->host->max_channel = PORTNUM2CHAN(num_fc_ports); -} - -/** - * init_afu() - setup as master context and start AFU - * @cfg: Internal structure associated with the host. - * - * This routine is a higher level of control for configuring the - * AFU on probe and reset paths. - * - * Return: 0 on success, -errno on failure - */ -static int init_afu(struct cxlflash_cfg *cfg) -{ - u64 reg; - int rc = 0; - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct hwq *hwq; - int i; - - cfg->ops->perst_reloads_same_image(cfg->afu_cookie, true); - - mutex_init(&afu->sync_active); - afu->num_hwqs = afu->desired_hwqs; - for (i = 0; i < afu->num_hwqs; i++) { - rc = init_mc(cfg, i); - if (rc) { - dev_err(dev, "%s: init_mc failed rc=%d index=%d\n", - __func__, rc, i); - goto err1; - } - } - - /* Map the entire MMIO space of the AFU using the first context */ - hwq = get_hwq(afu, PRIMARY_HWQ); - afu->afu_map = cfg->ops->psa_map(hwq->ctx_cookie); - if (!afu->afu_map) { - dev_err(dev, "%s: psa_map failed\n", __func__); - rc = -ENOMEM; - goto err1; - } - - /* No byte reverse on reading afu_version or string will be backwards */ - reg = readq(&afu->afu_map->global.regs.afu_version); - memcpy(afu->version, ®, sizeof(reg)); - afu->interface_version = - readq_be(&afu->afu_map->global.regs.interface_version); - if ((afu->interface_version + 1) == 0) { - dev_err(dev, "Back level AFU, please upgrade. AFU version %s " - "interface version %016llx\n", afu->version, - afu->interface_version); - rc = -EINVAL; - goto err1; - } - - if (afu_is_sq_cmd_mode(afu)) { - afu->send_cmd = send_cmd_sq; - afu->context_reset = context_reset_sq; - } else { - afu->send_cmd = send_cmd_ioarrin; - afu->context_reset = context_reset_ioarrin; - } - - dev_dbg(dev, "%s: afu_ver=%s interface_ver=%016llx\n", __func__, - afu->version, afu->interface_version); - - get_num_afu_ports(cfg); - - rc = start_afu(cfg); - if (rc) { - dev_err(dev, "%s: start_afu failed, rc=%d\n", __func__, rc); - goto err1; - } - - afu_err_intr_init(cfg->afu); - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - hwq->room = readq_be(&hwq->host_map->cmd_room); - } - - /* Restore the LUN mappings */ - cxlflash_restore_luntable(cfg); -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; - -err1: - for (i = afu->num_hwqs - 1; i >= 0; i--) { - term_intr(cfg, UNMAP_THREE, i); - term_mc(cfg, i); - } - goto out; -} - -/** - * afu_reset() - resets the AFU - * @cfg: Internal structure associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int afu_reset(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - int rc = 0; - - /* Stop the context before the reset. Since the context is - * no longer available restart it after the reset is complete - */ - term_afu(cfg); - - rc = init_afu(cfg); - - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * drain_ioctls() - wait until all currently executing ioctls have completed - * @cfg: Internal structure associated with the host. - * - * Obtain write access to read/write semaphore that wraps ioctl - * handling to 'drain' ioctls currently executing. - */ -static void drain_ioctls(struct cxlflash_cfg *cfg) -{ - down_write(&cfg->ioctl_rwsem); - up_write(&cfg->ioctl_rwsem); -} - -/** - * cxlflash_async_reset_host() - asynchronous host reset handler - * @data: Private data provided while scheduling reset. - * @cookie: Cookie that can be used for checkpointing. - */ -static void cxlflash_async_reset_host(void *data, async_cookie_t cookie) -{ - struct cxlflash_cfg *cfg = data; - struct device *dev = &cfg->dev->dev; - int rc = 0; - - if (cfg->state != STATE_RESET) { - dev_dbg(dev, "%s: Not performing a reset, state=%d\n", - __func__, cfg->state); - goto out; - } - - drain_ioctls(cfg); - cxlflash_mark_contexts_error(cfg); - rc = afu_reset(cfg); - if (rc) - cfg->state = STATE_FAILTERM; - else - cfg->state = STATE_NORMAL; - wake_up_all(&cfg->reset_waitq); - -out: - scsi_unblock_requests(cfg->host); -} - -/** - * cxlflash_schedule_async_reset() - schedule an asynchronous host reset - * @cfg: Internal structure associated with the host. - */ -static void cxlflash_schedule_async_reset(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - - if (cfg->state != STATE_NORMAL) { - dev_dbg(dev, "%s: Not performing reset state=%d\n", - __func__, cfg->state); - return; - } - - cfg->state = STATE_RESET; - scsi_block_requests(cfg->host); - cfg->async_reset_cookie = async_schedule(cxlflash_async_reset_host, - cfg); -} - -/** - * send_afu_cmd() - builds and sends an internal AFU command - * @afu: AFU associated with the host. - * @rcb: Pre-populated IOARCB describing command to send. - * - * The AFU can only take one internal AFU command at a time. This limitation is - * enforced by using a mutex to provide exclusive access to the AFU during the - * operation. This design point requires calling threads to not be on interrupt - * context due to the possibility of sleeping during concurrent AFU operations. - * - * The command status is optionally passed back to the caller when the caller - * populates the IOASA field of the IOARCB with a pointer to an IOASA structure. - * - * Return: - * 0 on success, -errno on failure - */ -static int send_afu_cmd(struct afu *afu, struct sisl_ioarcb *rcb) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct afu_cmd *cmd = NULL; - struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); - ulong lock_flags; - char *buf = NULL; - int rc = 0; - int nretry = 0; - - if (cfg->state != STATE_NORMAL) { - dev_dbg(dev, "%s: Sync not required state=%u\n", - __func__, cfg->state); - return 0; - } - - mutex_lock(&afu->sync_active); - atomic_inc(&afu->cmds_active); - buf = kmalloc(sizeof(*cmd) + __alignof__(*cmd) - 1, GFP_KERNEL); - if (unlikely(!buf)) { - dev_err(dev, "%s: no memory for command\n", __func__); - rc = -ENOMEM; - goto out; - } - - cmd = (struct afu_cmd *)PTR_ALIGN(buf, __alignof__(*cmd)); - -retry: - memset(cmd, 0, sizeof(*cmd)); - memcpy(&cmd->rcb, rcb, sizeof(*rcb)); - INIT_LIST_HEAD(&cmd->queue); - init_completion(&cmd->cevent); - cmd->parent = afu; - cmd->hwq_index = hwq->index; - cmd->rcb.ctx_id = hwq->ctx_hndl; - - dev_dbg(dev, "%s: afu=%p cmd=%p type=%02x nretry=%d\n", - __func__, afu, cmd, cmd->rcb.cdb[0], nretry); - - rc = afu->send_cmd(afu, cmd); - if (unlikely(rc)) { - rc = -ENOBUFS; - goto out; - } - - rc = wait_resp(afu, cmd); - switch (rc) { - case -ETIMEDOUT: - rc = afu->context_reset(hwq); - if (rc) { - /* Delete the command from pending_cmds list */ - spin_lock_irqsave(&hwq->hsq_slock, lock_flags); - list_del(&cmd->list); - spin_unlock_irqrestore(&hwq->hsq_slock, lock_flags); - - cxlflash_schedule_async_reset(cfg); - break; - } - fallthrough; /* to retry */ - case -EAGAIN: - if (++nretry < 2) - goto retry; - fallthrough; /* to exit */ - default: - break; - } - - if (rcb->ioasa) - *rcb->ioasa = cmd->sa; -out: - atomic_dec(&afu->cmds_active); - mutex_unlock(&afu->sync_active); - kfree(buf); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_afu_sync() - builds and sends an AFU sync command - * @afu: AFU associated with the host. - * @ctx: Identifies context requesting sync. - * @res: Identifies resource requesting sync. - * @mode: Type of sync to issue (lightweight, heavyweight, global). - * - * AFU sync operations are only necessary and allowed when the device is - * operating normally. When not operating normally, sync requests can occur as - * part of cleaning up resources associated with an adapter prior to removal. - * In this scenario, these requests are simply ignored (safe due to the AFU - * going away). - * - * Return: - * 0 on success, -errno on failure - */ -int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t ctx, res_hndl_t res, u8 mode) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct sisl_ioarcb rcb = { 0 }; - - dev_dbg(dev, "%s: afu=%p ctx=%u res=%u mode=%u\n", - __func__, afu, ctx, res, mode); - - rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; - rcb.msi = SISL_MSI_RRQ_UPDATED; - rcb.timeout = MC_AFU_SYNC_TIMEOUT; - - rcb.cdb[0] = SISL_AFU_CMD_SYNC; - rcb.cdb[1] = mode; - put_unaligned_be16(ctx, &rcb.cdb[2]); - put_unaligned_be32(res, &rcb.cdb[4]); - - return send_afu_cmd(afu, &rcb); -} - -/** - * cxlflash_eh_abort_handler() - abort a SCSI command - * @scp: SCSI command to abort. - * - * CXL Flash devices do not support a single command abort. Reset the context - * as per SISLite specification. Flush any pending commands in the hardware - * queue before the reset. - * - * Return: SUCCESS/FAILED as defined in scsi/scsi.h - */ -static int cxlflash_eh_abort_handler(struct scsi_cmnd *scp) -{ - int rc = FAILED; - struct Scsi_Host *host = scp->device->host; - struct cxlflash_cfg *cfg = shost_priv(host); - struct afu_cmd *cmd = sc_to_afuc(scp); - struct device *dev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct hwq *hwq = get_hwq(afu, cmd->hwq_index); - - dev_dbg(dev, "%s: (scp=%p) %d/%d/%d/%llu " - "cdb=(%08x-%08x-%08x-%08x)\n", __func__, scp, host->host_no, - scp->device->channel, scp->device->id, scp->device->lun, - get_unaligned_be32(&((u32 *)scp->cmnd)[0]), - get_unaligned_be32(&((u32 *)scp->cmnd)[1]), - get_unaligned_be32(&((u32 *)scp->cmnd)[2]), - get_unaligned_be32(&((u32 *)scp->cmnd)[3])); - - /* When the state is not normal, another reset/reload is in progress. - * Return failed and the mid-layer will invoke host reset handler. - */ - if (cfg->state != STATE_NORMAL) { - dev_dbg(dev, "%s: Invalid state for abort, state=%d\n", - __func__, cfg->state); - goto out; - } - - rc = afu->context_reset(hwq); - if (unlikely(rc)) - goto out; - - rc = SUCCESS; - -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_eh_device_reset_handler() - reset a single LUN - * @scp: SCSI command to send. - * - * Return: - * SUCCESS as defined in scsi/scsi.h - * FAILED as defined in scsi/scsi.h - */ -static int cxlflash_eh_device_reset_handler(struct scsi_cmnd *scp) -{ - int rc = SUCCESS; - struct scsi_device *sdev = scp->device; - struct Scsi_Host *host = sdev->host; - struct cxlflash_cfg *cfg = shost_priv(host); - struct device *dev = &cfg->dev->dev; - int rcr = 0; - - dev_dbg(dev, "%s: %d/%d/%d/%llu\n", __func__, - host->host_no, sdev->channel, sdev->id, sdev->lun); -retry: - switch (cfg->state) { - case STATE_NORMAL: - rcr = send_tmf(cfg, sdev, TMF_LUN_RESET); - if (unlikely(rcr)) - rc = FAILED; - break; - case STATE_RESET: - wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); - goto retry; - default: - rc = FAILED; - break; - } - - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_eh_host_reset_handler() - reset the host adapter - * @scp: SCSI command from stack identifying host. - * - * Following a reset, the state is evaluated again in case an EEH occurred - * during the reset. In such a scenario, the host reset will either yield - * until the EEH recovery is complete or return success or failure based - * upon the current device state. - * - * Return: - * SUCCESS as defined in scsi/scsi.h - * FAILED as defined in scsi/scsi.h - */ -static int cxlflash_eh_host_reset_handler(struct scsi_cmnd *scp) -{ - int rc = SUCCESS; - int rcr = 0; - struct Scsi_Host *host = scp->device->host; - struct cxlflash_cfg *cfg = shost_priv(host); - struct device *dev = &cfg->dev->dev; - - dev_dbg(dev, "%s: %d\n", __func__, host->host_no); - - switch (cfg->state) { - case STATE_NORMAL: - cfg->state = STATE_RESET; - drain_ioctls(cfg); - cxlflash_mark_contexts_error(cfg); - rcr = afu_reset(cfg); - if (rcr) { - rc = FAILED; - cfg->state = STATE_FAILTERM; - } else - cfg->state = STATE_NORMAL; - wake_up_all(&cfg->reset_waitq); - ssleep(1); - fallthrough; - case STATE_RESET: - wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); - if (cfg->state == STATE_NORMAL) - break; - fallthrough; - default: - rc = FAILED; - break; - } - - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_change_queue_depth() - change the queue depth for the device - * @sdev: SCSI device destined for queue depth change. - * @qdepth: Requested queue depth value to set. - * - * The requested queue depth is capped to the maximum supported value. - * - * Return: The actual queue depth set. - */ -static int cxlflash_change_queue_depth(struct scsi_device *sdev, int qdepth) -{ - - if (qdepth > CXLFLASH_MAX_CMDS_PER_LUN) - qdepth = CXLFLASH_MAX_CMDS_PER_LUN; - - scsi_change_queue_depth(sdev, qdepth); - return sdev->queue_depth; -} - -/** - * cxlflash_show_port_status() - queries and presents the current port status - * @port: Desired port for status reporting. - * @cfg: Internal structure associated with the host. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf or -EINVAL. - */ -static ssize_t cxlflash_show_port_status(u32 port, - struct cxlflash_cfg *cfg, - char *buf) -{ - struct device *dev = &cfg->dev->dev; - char *disp_status; - u64 status; - __be64 __iomem *fc_port_regs; - - WARN_ON(port >= MAX_FC_PORTS); - - if (port >= cfg->num_fc_ports) { - dev_info(dev, "%s: Port %d not supported on this card.\n", - __func__, port); - return -EINVAL; - } - - fc_port_regs = get_fc_port_regs(cfg, port); - status = readq_be(&fc_port_regs[FC_MTIP_STATUS / 8]); - status &= FC_MTIP_STATUS_MASK; - - if (status == FC_MTIP_STATUS_ONLINE) - disp_status = "online"; - else if (status == FC_MTIP_STATUS_OFFLINE) - disp_status = "offline"; - else - disp_status = "unknown"; - - return scnprintf(buf, PAGE_SIZE, "%s\n", disp_status); -} - -/** - * port0_show() - queries and presents the current status of port 0 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port0_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_status(0, cfg, buf); -} - -/** - * port1_show() - queries and presents the current status of port 1 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port1_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_status(1, cfg, buf); -} - -/** - * port2_show() - queries and presents the current status of port 2 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port2_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_status(2, cfg, buf); -} - -/** - * port3_show() - queries and presents the current status of port 3 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port3_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_status(3, cfg, buf); -} - -/** - * lun_mode_show() - presents the current LUN mode of the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the LUN mode. - * @buf: Buffer of length PAGE_SIZE to report back the LUN mode in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t lun_mode_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct afu *afu = cfg->afu; - - return scnprintf(buf, PAGE_SIZE, "%u\n", afu->internal_lun); -} - -/** - * lun_mode_store() - sets the LUN mode of the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the LUN mode. - * @buf: Buffer of length PAGE_SIZE containing the LUN mode in ASCII. - * @count: Length of data resizing in @buf. - * - * The CXL Flash AFU supports a dummy LUN mode where the external - * links and storage are not required. Space on the FPGA is used - * to create 1 or 2 small LUNs which are presented to the system - * as if they were a normal storage device. This feature is useful - * during development and also provides manufacturing with a way - * to test the AFU without an actual device. - * - * 0 = external LUN[s] (default) - * 1 = internal LUN (1 x 64K, 512B blocks, id 0) - * 2 = internal LUN (1 x 64K, 4K blocks, id 0) - * 3 = internal LUN (2 x 32K, 512B blocks, ids 0,1) - * 4 = internal LUN (2 x 32K, 4K blocks, ids 0,1) - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t lun_mode_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct Scsi_Host *shost = class_to_shost(dev); - struct cxlflash_cfg *cfg = shost_priv(shost); - struct afu *afu = cfg->afu; - int rc; - u32 lun_mode; - - rc = kstrtouint(buf, 10, &lun_mode); - if (!rc && (lun_mode < 5) && (lun_mode != afu->internal_lun)) { - afu->internal_lun = lun_mode; - - /* - * When configured for internal LUN, there is only one channel, - * channel number 0, else there will be one less than the number - * of fc ports for this card. - */ - if (afu->internal_lun) - shost->max_channel = 0; - else - shost->max_channel = PORTNUM2CHAN(cfg->num_fc_ports); - - afu_reset(cfg); - scsi_scan_host(cfg->host); - } - - return count; -} - -/** - * ioctl_version_show() - presents the current ioctl version of the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the ioctl version. - * @buf: Buffer of length PAGE_SIZE to report back the ioctl version. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t ioctl_version_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - ssize_t bytes = 0; - - bytes = scnprintf(buf, PAGE_SIZE, - "disk: %u\n", DK_CXLFLASH_VERSION_0); - bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, - "host: %u\n", HT_CXLFLASH_VERSION_0); - - return bytes; -} - -/** - * cxlflash_show_port_lun_table() - queries and presents the port LUN table - * @port: Desired port for status reporting. - * @cfg: Internal structure associated with the host. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf or -EINVAL. - */ -static ssize_t cxlflash_show_port_lun_table(u32 port, - struct cxlflash_cfg *cfg, - char *buf) -{ - struct device *dev = &cfg->dev->dev; - __be64 __iomem *fc_port_luns; - int i; - ssize_t bytes = 0; - - WARN_ON(port >= MAX_FC_PORTS); - - if (port >= cfg->num_fc_ports) { - dev_info(dev, "%s: Port %d not supported on this card.\n", - __func__, port); - return -EINVAL; - } - - fc_port_luns = get_fc_port_luns(cfg, port); - - for (i = 0; i < CXLFLASH_NUM_VLUNS; i++) - bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes, - "%03d: %016llx\n", - i, readq_be(&fc_port_luns[i])); - return bytes; -} - -/** - * port0_lun_table_show() - presents the current LUN table of port 0 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port0_lun_table_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_lun_table(0, cfg, buf); -} - -/** - * port1_lun_table_show() - presents the current LUN table of port 1 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port1_lun_table_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_lun_table(1, cfg, buf); -} - -/** - * port2_lun_table_show() - presents the current LUN table of port 2 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port2_lun_table_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_lun_table(2, cfg, buf); -} - -/** - * port3_lun_table_show() - presents the current LUN table of port 3 - * @dev: Generic device associated with the host owning the port. - * @attr: Device attribute representing the port. - * @buf: Buffer of length PAGE_SIZE to report back port status in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t port3_lun_table_show(struct device *dev, - struct device_attribute *attr, - char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - - return cxlflash_show_port_lun_table(3, cfg, buf); -} - -/** - * irqpoll_weight_show() - presents the current IRQ poll weight for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the IRQ poll weight. - * @buf: Buffer of length PAGE_SIZE to report back the current IRQ poll - * weight in ASCII. - * - * An IRQ poll weight of 0 indicates polling is disabled. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t irqpoll_weight_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct afu *afu = cfg->afu; - - return scnprintf(buf, PAGE_SIZE, "%u\n", afu->irqpoll_weight); -} - -/** - * irqpoll_weight_store() - sets the current IRQ poll weight for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the IRQ poll weight. - * @buf: Buffer of length PAGE_SIZE containing the desired IRQ poll - * weight in ASCII. - * @count: Length of data resizing in @buf. - * - * An IRQ poll weight of 0 indicates polling is disabled. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t irqpoll_weight_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct device *cfgdev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct hwq *hwq; - u32 weight; - int rc, i; - - rc = kstrtouint(buf, 10, &weight); - if (rc) - return -EINVAL; - - if (weight > 256) { - dev_info(cfgdev, - "Invalid IRQ poll weight. It must be 256 or less.\n"); - return -EINVAL; - } - - if (weight == afu->irqpoll_weight) { - dev_info(cfgdev, - "Current IRQ poll weight has the same weight.\n"); - return -EINVAL; - } - - if (afu_is_irqpoll_enabled(afu)) { - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - irq_poll_disable(&hwq->irqpoll); - } - } - - afu->irqpoll_weight = weight; - - if (weight > 0) { - for (i = 0; i < afu->num_hwqs; i++) { - hwq = get_hwq(afu, i); - - irq_poll_init(&hwq->irqpoll, weight, cxlflash_irqpoll); - } - } - - return count; -} - -/** - * num_hwqs_show() - presents the number of hardware queues for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the number of hardware queues. - * @buf: Buffer of length PAGE_SIZE to report back the number of hardware - * queues in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t num_hwqs_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct afu *afu = cfg->afu; - - return scnprintf(buf, PAGE_SIZE, "%u\n", afu->num_hwqs); -} - -/** - * num_hwqs_store() - sets the number of hardware queues for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the number of hardware queues. - * @buf: Buffer of length PAGE_SIZE containing the number of hardware - * queues in ASCII. - * @count: Length of data resizing in @buf. - * - * n > 0: num_hwqs = n - * n = 0: num_hwqs = num_online_cpus() - * n < 0: num_online_cpus() / abs(n) - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t num_hwqs_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct afu *afu = cfg->afu; - int rc; - int nhwqs, num_hwqs; - - rc = kstrtoint(buf, 10, &nhwqs); - if (rc) - return -EINVAL; - - if (nhwqs >= 1) - num_hwqs = nhwqs; - else if (nhwqs == 0) - num_hwqs = num_online_cpus(); - else - num_hwqs = num_online_cpus() / abs(nhwqs); - - afu->desired_hwqs = min(num_hwqs, CXLFLASH_MAX_HWQS); - WARN_ON_ONCE(afu->desired_hwqs == 0); - -retry: - switch (cfg->state) { - case STATE_NORMAL: - cfg->state = STATE_RESET; - drain_ioctls(cfg); - cxlflash_mark_contexts_error(cfg); - rc = afu_reset(cfg); - if (rc) - cfg->state = STATE_FAILTERM; - else - cfg->state = STATE_NORMAL; - wake_up_all(&cfg->reset_waitq); - break; - case STATE_RESET: - wait_event(cfg->reset_waitq, cfg->state != STATE_RESET); - if (cfg->state == STATE_NORMAL) - goto retry; - fallthrough; - default: - /* Ideally should not happen */ - dev_err(dev, "%s: Device is not ready, state=%d\n", - __func__, cfg->state); - break; - } - - return count; -} - -static const char *hwq_mode_name[MAX_HWQ_MODE] = { "rr", "tag", "cpu" }; - -/** - * hwq_mode_show() - presents the HWQ steering mode for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the HWQ steering mode. - * @buf: Buffer of length PAGE_SIZE to report back the HWQ steering mode - * as a character string. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t hwq_mode_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct cxlflash_cfg *cfg = shost_priv(class_to_shost(dev)); - struct afu *afu = cfg->afu; - - return scnprintf(buf, PAGE_SIZE, "%s\n", hwq_mode_name[afu->hwq_mode]); -} - -/** - * hwq_mode_store() - sets the HWQ steering mode for the host - * @dev: Generic device associated with the host. - * @attr: Device attribute representing the HWQ steering mode. - * @buf: Buffer of length PAGE_SIZE containing the HWQ steering mode - * as a character string. - * @count: Length of data resizing in @buf. - * - * rr = Round-Robin - * tag = Block MQ Tagging - * cpu = CPU Affinity - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t hwq_mode_store(struct device *dev, - struct device_attribute *attr, - const char *buf, size_t count) -{ - struct Scsi_Host *shost = class_to_shost(dev); - struct cxlflash_cfg *cfg = shost_priv(shost); - struct device *cfgdev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - int i; - u32 mode = MAX_HWQ_MODE; - - for (i = 0; i < MAX_HWQ_MODE; i++) { - if (!strncmp(hwq_mode_name[i], buf, strlen(hwq_mode_name[i]))) { - mode = i; - break; - } - } - - if (mode >= MAX_HWQ_MODE) { - dev_info(cfgdev, "Invalid HWQ steering mode.\n"); - return -EINVAL; - } - - afu->hwq_mode = mode; - - return count; -} - -/** - * mode_show() - presents the current mode of the device - * @dev: Generic device associated with the device. - * @attr: Device attribute representing the device mode. - * @buf: Buffer of length PAGE_SIZE to report back the dev mode in ASCII. - * - * Return: The size of the ASCII string returned in @buf. - */ -static ssize_t mode_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct scsi_device *sdev = to_scsi_device(dev); - - return scnprintf(buf, PAGE_SIZE, "%s\n", - sdev->hostdata ? "superpipe" : "legacy"); -} - -/* - * Host attributes - */ -static DEVICE_ATTR_RO(port0); -static DEVICE_ATTR_RO(port1); -static DEVICE_ATTR_RO(port2); -static DEVICE_ATTR_RO(port3); -static DEVICE_ATTR_RW(lun_mode); -static DEVICE_ATTR_RO(ioctl_version); -static DEVICE_ATTR_RO(port0_lun_table); -static DEVICE_ATTR_RO(port1_lun_table); -static DEVICE_ATTR_RO(port2_lun_table); -static DEVICE_ATTR_RO(port3_lun_table); -static DEVICE_ATTR_RW(irqpoll_weight); -static DEVICE_ATTR_RW(num_hwqs); -static DEVICE_ATTR_RW(hwq_mode); - -static struct attribute *cxlflash_host_attrs[] = { - &dev_attr_port0.attr, - &dev_attr_port1.attr, - &dev_attr_port2.attr, - &dev_attr_port3.attr, - &dev_attr_lun_mode.attr, - &dev_attr_ioctl_version.attr, - &dev_attr_port0_lun_table.attr, - &dev_attr_port1_lun_table.attr, - &dev_attr_port2_lun_table.attr, - &dev_attr_port3_lun_table.attr, - &dev_attr_irqpoll_weight.attr, - &dev_attr_num_hwqs.attr, - &dev_attr_hwq_mode.attr, - NULL -}; - -ATTRIBUTE_GROUPS(cxlflash_host); - -/* - * Device attributes - */ -static DEVICE_ATTR_RO(mode); - -static struct attribute *cxlflash_dev_attrs[] = { - &dev_attr_mode.attr, - NULL -}; - -ATTRIBUTE_GROUPS(cxlflash_dev); - -/* - * Host template - */ -static struct scsi_host_template driver_template = { - .module = THIS_MODULE, - .name = CXLFLASH_ADAPTER_NAME, - .info = cxlflash_driver_info, - .ioctl = cxlflash_ioctl, - .proc_name = CXLFLASH_NAME, - .queuecommand = cxlflash_queuecommand, - .eh_abort_handler = cxlflash_eh_abort_handler, - .eh_device_reset_handler = cxlflash_eh_device_reset_handler, - .eh_host_reset_handler = cxlflash_eh_host_reset_handler, - .change_queue_depth = cxlflash_change_queue_depth, - .cmd_per_lun = CXLFLASH_MAX_CMDS_PER_LUN, - .can_queue = CXLFLASH_MAX_CMDS, - .cmd_size = sizeof(struct afu_cmd) + __alignof__(struct afu_cmd) - 1, - .this_id = -1, - .sg_tablesize = 1, /* No scatter gather support */ - .max_sectors = CXLFLASH_MAX_SECTORS, - .shost_groups = cxlflash_host_groups, - .sdev_groups = cxlflash_dev_groups, -}; - -/* - * Device dependent values - */ -static struct dev_dependent_vals dev_corsa_vals = { CXLFLASH_MAX_SECTORS, - CXLFLASH_WWPN_VPD_REQUIRED }; -static struct dev_dependent_vals dev_flash_gt_vals = { CXLFLASH_MAX_SECTORS, - CXLFLASH_NOTIFY_SHUTDOWN }; -static struct dev_dependent_vals dev_briard_vals = { CXLFLASH_MAX_SECTORS, - (CXLFLASH_NOTIFY_SHUTDOWN | - CXLFLASH_OCXL_DEV) }; - -/* - * PCI device binding table - */ -static struct pci_device_id cxlflash_pci_table[] = { - {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_CORSA, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_corsa_vals}, - {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_FLASH_GT, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_flash_gt_vals}, - {PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_BRIARD, - PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)&dev_briard_vals}, - {} -}; - -MODULE_DEVICE_TABLE(pci, cxlflash_pci_table); - -/** - * cxlflash_worker_thread() - work thread handler for the AFU - * @work: Work structure contained within cxlflash associated with host. - * - * Handles the following events: - * - Link reset which cannot be performed on interrupt context due to - * blocking up to a few seconds - * - Rescan the host - */ -static void cxlflash_worker_thread(struct work_struct *work) -{ - struct cxlflash_cfg *cfg = container_of(work, struct cxlflash_cfg, - work_q); - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - __be64 __iomem *fc_port_regs; - int port; - ulong lock_flags; - - /* Avoid MMIO if the device has failed */ - - if (cfg->state != STATE_NORMAL) - return; - - spin_lock_irqsave(cfg->host->host_lock, lock_flags); - - if (cfg->lr_state == LINK_RESET_REQUIRED) { - port = cfg->lr_port; - if (port < 0) - dev_err(dev, "%s: invalid port index %d\n", - __func__, port); - else { - spin_unlock_irqrestore(cfg->host->host_lock, - lock_flags); - - /* The reset can block... */ - fc_port_regs = get_fc_port_regs(cfg, port); - afu_link_reset(afu, port, fc_port_regs); - spin_lock_irqsave(cfg->host->host_lock, lock_flags); - } - - cfg->lr_state = LINK_RESET_COMPLETE; - } - - spin_unlock_irqrestore(cfg->host->host_lock, lock_flags); - - if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0) - scsi_scan_host(cfg->host); -} - -/** - * cxlflash_chr_open() - character device open handler - * @inode: Device inode associated with this character device. - * @file: File pointer for this device. - * - * Only users with admin privileges are allowed to open the character device. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_chr_open(struct inode *inode, struct file *file) -{ - struct cxlflash_cfg *cfg; - - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; - - cfg = container_of(inode->i_cdev, struct cxlflash_cfg, cdev); - file->private_data = cfg; - - return 0; -} - -/** - * decode_hioctl() - translates encoded host ioctl to easily identifiable string - * @cmd: The host ioctl command to decode. - * - * Return: A string identifying the decoded host ioctl. - */ -static char *decode_hioctl(unsigned int cmd) -{ - switch (cmd) { - case HT_CXLFLASH_LUN_PROVISION: - return __stringify_1(HT_CXLFLASH_LUN_PROVISION); - } - - return "UNKNOWN"; -} - -/** - * cxlflash_lun_provision() - host LUN provisioning handler - * @cfg: Internal structure associated with the host. - * @lunprov: Kernel copy of userspace ioctl data structure. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_lun_provision(struct cxlflash_cfg *cfg, - struct ht_cxlflash_lun_provision *lunprov) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct sisl_ioarcb rcb; - struct sisl_ioasa asa; - __be64 __iomem *fc_port_regs; - u16 port = lunprov->port; - u16 scmd = lunprov->hdr.subcmd; - u16 type; - u64 reg; - u64 size; - u64 lun_id; - int rc = 0; - - if (!afu_is_lun_provision(afu)) { - rc = -ENOTSUPP; - goto out; - } - - if (port >= cfg->num_fc_ports) { - rc = -EINVAL; - goto out; - } - - switch (scmd) { - case HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN: - type = SISL_AFU_LUN_PROVISION_CREATE; - size = lunprov->size; - lun_id = 0; - break; - case HT_CXLFLASH_LUN_PROVISION_SUBCMD_DELETE_LUN: - type = SISL_AFU_LUN_PROVISION_DELETE; - size = 0; - lun_id = lunprov->lun_id; - break; - case HT_CXLFLASH_LUN_PROVISION_SUBCMD_QUERY_PORT: - fc_port_regs = get_fc_port_regs(cfg, port); - - reg = readq_be(&fc_port_regs[FC_MAX_NUM_LUNS / 8]); - lunprov->max_num_luns = reg; - reg = readq_be(&fc_port_regs[FC_CUR_NUM_LUNS / 8]); - lunprov->cur_num_luns = reg; - reg = readq_be(&fc_port_regs[FC_MAX_CAP_PORT / 8]); - lunprov->max_cap_port = reg; - reg = readq_be(&fc_port_regs[FC_CUR_CAP_PORT / 8]); - lunprov->cur_cap_port = reg; - - goto out; - default: - rc = -EINVAL; - goto out; - } - - memset(&rcb, 0, sizeof(rcb)); - memset(&asa, 0, sizeof(asa)); - rcb.req_flags = SISL_REQ_FLAGS_AFU_CMD; - rcb.lun_id = lun_id; - rcb.msi = SISL_MSI_RRQ_UPDATED; - rcb.timeout = MC_LUN_PROV_TIMEOUT; - rcb.ioasa = &asa; - - rcb.cdb[0] = SISL_AFU_CMD_LUN_PROVISION; - rcb.cdb[1] = type; - rcb.cdb[2] = port; - put_unaligned_be64(size, &rcb.cdb[8]); - - rc = send_afu_cmd(afu, &rcb); - if (rc) { - dev_err(dev, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n", - __func__, rc, asa.ioasc, asa.afu_extra); - goto out; - } - - if (scmd == HT_CXLFLASH_LUN_PROVISION_SUBCMD_CREATE_LUN) { - lunprov->lun_id = (u64)asa.lunid_hi << 32 | asa.lunid_lo; - memcpy(lunprov->wwid, asa.wwid, sizeof(lunprov->wwid)); - } -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_afu_debug() - host AFU debug handler - * @cfg: Internal structure associated with the host. - * @afu_dbg: Kernel copy of userspace ioctl data structure. - * - * For debug requests requiring a data buffer, always provide an aligned - * (cache line) buffer to the AFU to appease any alignment requirements. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_afu_debug(struct cxlflash_cfg *cfg, - struct ht_cxlflash_afu_debug *afu_dbg) -{ - struct afu *afu = cfg->afu; - struct device *dev = &cfg->dev->dev; - struct sisl_ioarcb rcb; - struct sisl_ioasa asa; - char *buf = NULL; - char *kbuf = NULL; - void __user *ubuf = (__force void __user *)afu_dbg->data_ea; - u16 req_flags = SISL_REQ_FLAGS_AFU_CMD; - u32 ulen = afu_dbg->data_len; - bool is_write = afu_dbg->hdr.flags & HT_CXLFLASH_HOST_WRITE; - int rc = 0; - - if (!afu_is_afu_debug(afu)) { - rc = -ENOTSUPP; - goto out; - } - - if (ulen) { - req_flags |= SISL_REQ_FLAGS_SUP_UNDERRUN; - - if (ulen > HT_CXLFLASH_AFU_DEBUG_MAX_DATA_LEN) { - rc = -EINVAL; - goto out; - } - - buf = kmalloc(ulen + cache_line_size() - 1, GFP_KERNEL); - if (unlikely(!buf)) { - rc = -ENOMEM; - goto out; - } - - kbuf = PTR_ALIGN(buf, cache_line_size()); - - if (is_write) { - req_flags |= SISL_REQ_FLAGS_HOST_WRITE; - - if (copy_from_user(kbuf, ubuf, ulen)) { - rc = -EFAULT; - goto out; - } - } - } - - memset(&rcb, 0, sizeof(rcb)); - memset(&asa, 0, sizeof(asa)); - - rcb.req_flags = req_flags; - rcb.msi = SISL_MSI_RRQ_UPDATED; - rcb.timeout = MC_AFU_DEBUG_TIMEOUT; - rcb.ioasa = &asa; - - if (ulen) { - rcb.data_len = ulen; - rcb.data_ea = (uintptr_t)kbuf; - } - - rcb.cdb[0] = SISL_AFU_CMD_DEBUG; - memcpy(&rcb.cdb[4], afu_dbg->afu_subcmd, - HT_CXLFLASH_AFU_DEBUG_SUBCMD_LEN); - - rc = send_afu_cmd(afu, &rcb); - if (rc) { - dev_err(dev, "%s: send_afu_cmd failed rc=%d asc=%08x afux=%x\n", - __func__, rc, asa.ioasc, asa.afu_extra); - goto out; - } - - if (ulen && !is_write) { - if (copy_to_user(ubuf, kbuf, ulen)) - rc = -EFAULT; - } -out: - kfree(buf); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_chr_ioctl() - character device IOCTL handler - * @file: File pointer for this device. - * @cmd: IOCTL command. - * @arg: Userspace ioctl data structure. - * - * A read/write semaphore is used to implement a 'drain' of currently - * running ioctls. The read semaphore is taken at the beginning of each - * ioctl thread and released upon concluding execution. Additionally the - * semaphore should be released and then reacquired in any ioctl execution - * path which will wait for an event to occur that is outside the scope of - * the ioctl (i.e. an adapter reset). To drain the ioctls currently running, - * a thread simply needs to acquire the write semaphore. - * - * Return: 0 on success, -errno on failure - */ -static long cxlflash_chr_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) -{ - typedef int (*hioctl) (struct cxlflash_cfg *, void *); - - struct cxlflash_cfg *cfg = file->private_data; - struct device *dev = &cfg->dev->dev; - char buf[sizeof(union cxlflash_ht_ioctls)]; - void __user *uarg = (void __user *)arg; - struct ht_cxlflash_hdr *hdr; - size_t size = 0; - bool known_ioctl = false; - int idx = 0; - int rc = 0; - hioctl do_ioctl = NULL; - - static const struct { - size_t size; - hioctl ioctl; - } ioctl_tbl[] = { /* NOTE: order matters here */ - { sizeof(struct ht_cxlflash_lun_provision), - (hioctl)cxlflash_lun_provision }, - { sizeof(struct ht_cxlflash_afu_debug), - (hioctl)cxlflash_afu_debug }, - }; - - /* Hold read semaphore so we can drain if needed */ - down_read(&cfg->ioctl_rwsem); - - dev_dbg(dev, "%s: cmd=%u idx=%d tbl_size=%lu\n", - __func__, cmd, idx, sizeof(ioctl_tbl)); - - switch (cmd) { - case HT_CXLFLASH_LUN_PROVISION: - case HT_CXLFLASH_AFU_DEBUG: - known_ioctl = true; - idx = _IOC_NR(HT_CXLFLASH_LUN_PROVISION) - _IOC_NR(cmd); - size = ioctl_tbl[idx].size; - do_ioctl = ioctl_tbl[idx].ioctl; - - if (likely(do_ioctl)) - break; - - fallthrough; - default: - rc = -EINVAL; - goto out; - } - - if (unlikely(copy_from_user(&buf, uarg, size))) { - dev_err(dev, "%s: copy_from_user() fail " - "size=%lu cmd=%d (%s) uarg=%p\n", - __func__, size, cmd, decode_hioctl(cmd), uarg); - rc = -EFAULT; - goto out; - } - - hdr = (struct ht_cxlflash_hdr *)&buf; - if (hdr->version != HT_CXLFLASH_VERSION_0) { - dev_dbg(dev, "%s: Version %u not supported for %s\n", - __func__, hdr->version, decode_hioctl(cmd)); - rc = -EINVAL; - goto out; - } - - if (hdr->rsvd[0] || hdr->rsvd[1] || hdr->return_flags) { - dev_dbg(dev, "%s: Reserved/rflags populated\n", __func__); - rc = -EINVAL; - goto out; - } - - rc = do_ioctl(cfg, (void *)&buf); - if (likely(!rc)) - if (unlikely(copy_to_user(uarg, &buf, size))) { - dev_err(dev, "%s: copy_to_user() fail " - "size=%lu cmd=%d (%s) uarg=%p\n", - __func__, size, cmd, decode_hioctl(cmd), uarg); - rc = -EFAULT; - } - - /* fall through to exit */ - -out: - up_read(&cfg->ioctl_rwsem); - if (unlikely(rc && known_ioctl)) - dev_err(dev, "%s: ioctl %s (%08X) returned rc=%d\n", - __func__, decode_hioctl(cmd), cmd, rc); - else - dev_dbg(dev, "%s: ioctl %s (%08X) returned rc=%d\n", - __func__, decode_hioctl(cmd), cmd, rc); - return rc; -} - -/* - * Character device file operations - */ -static const struct file_operations cxlflash_chr_fops = { - .owner = THIS_MODULE, - .open = cxlflash_chr_open, - .unlocked_ioctl = cxlflash_chr_ioctl, - .compat_ioctl = compat_ptr_ioctl, -}; - -/** - * init_chrdev() - initialize the character device for the host - * @cfg: Internal structure associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int init_chrdev(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - struct device *char_dev; - dev_t devno; - int minor; - int rc = 0; - - minor = cxlflash_get_minor(); - if (unlikely(minor < 0)) { - dev_err(dev, "%s: Exhausted allowed adapters\n", __func__); - rc = -ENOSPC; - goto out; - } - - devno = MKDEV(cxlflash_major, minor); - cdev_init(&cfg->cdev, &cxlflash_chr_fops); - - rc = cdev_add(&cfg->cdev, devno, 1); - if (rc) { - dev_err(dev, "%s: cdev_add failed rc=%d\n", __func__, rc); - goto err1; - } - - char_dev = device_create(&cxlflash_class, NULL, devno, - NULL, "cxlflash%d", minor); - if (IS_ERR(char_dev)) { - rc = PTR_ERR(char_dev); - dev_err(dev, "%s: device_create failed rc=%d\n", - __func__, rc); - goto err2; - } - - cfg->chardev = char_dev; -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -err2: - cdev_del(&cfg->cdev); -err1: - cxlflash_put_minor(minor); - goto out; -} - -/** - * cxlflash_probe() - PCI entry point to add host - * @pdev: PCI device associated with the host. - * @dev_id: PCI device id associated with device. - * - * The device will initially start out in a 'probing' state and - * transition to the 'normal' state at the end of a successful - * probe. Should an EEH event occur during probe, the notification - * thread (error_detected()) will wait until the probe handler - * is nearly complete. At that time, the device will be moved to - * a 'probed' state and the EEH thread woken up to drive the slot - * reset and recovery (device moves to 'normal' state). Meanwhile, - * the probe will be allowed to exit successfully. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_probe(struct pci_dev *pdev, - const struct pci_device_id *dev_id) -{ - struct Scsi_Host *host; - struct cxlflash_cfg *cfg = NULL; - struct device *dev = &pdev->dev; - struct dev_dependent_vals *ddv; - int rc = 0; - int k; - - dev_dbg(&pdev->dev, "%s: Found CXLFLASH with IRQ: %d\n", - __func__, pdev->irq); - - ddv = (struct dev_dependent_vals *)dev_id->driver_data; - driver_template.max_sectors = ddv->max_sectors; - - host = scsi_host_alloc(&driver_template, sizeof(struct cxlflash_cfg)); - if (!host) { - dev_err(dev, "%s: scsi_host_alloc failed\n", __func__); - rc = -ENOMEM; - goto out; - } - - host->max_id = CXLFLASH_MAX_NUM_TARGETS_PER_BUS; - host->max_lun = CXLFLASH_MAX_NUM_LUNS_PER_TARGET; - host->unique_id = host->host_no; - host->max_cmd_len = CXLFLASH_MAX_CDB_LEN; - - cfg = shost_priv(host); - cfg->state = STATE_PROBING; - cfg->host = host; - rc = alloc_mem(cfg); - if (rc) { - dev_err(dev, "%s: alloc_mem failed\n", __func__); - rc = -ENOMEM; - scsi_host_put(cfg->host); - goto out; - } - - cfg->init_state = INIT_STATE_NONE; - cfg->dev = pdev; - cfg->cxl_fops = cxlflash_cxl_fops; - cfg->ops = cxlflash_assign_ops(ddv); - WARN_ON_ONCE(!cfg->ops); - - /* - * Promoted LUNs move to the top of the LUN table. The rest stay on - * the bottom half. The bottom half grows from the end (index = 255), - * whereas the top half grows from the beginning (index = 0). - * - * Initialize the last LUN index for all possible ports. - */ - cfg->promote_lun_index = 0; - - for (k = 0; k < MAX_FC_PORTS; k++) - cfg->last_lun_index[k] = CXLFLASH_NUM_VLUNS/2 - 1; - - cfg->dev_id = (struct pci_device_id *)dev_id; - - init_waitqueue_head(&cfg->tmf_waitq); - init_waitqueue_head(&cfg->reset_waitq); - - INIT_WORK(&cfg->work_q, cxlflash_worker_thread); - cfg->lr_state = LINK_RESET_INVALID; - cfg->lr_port = -1; - spin_lock_init(&cfg->tmf_slock); - mutex_init(&cfg->ctx_tbl_list_mutex); - mutex_init(&cfg->ctx_recovery_mutex); - init_rwsem(&cfg->ioctl_rwsem); - INIT_LIST_HEAD(&cfg->ctx_err_recovery); - INIT_LIST_HEAD(&cfg->lluns); - - pci_set_drvdata(pdev, cfg); - - rc = init_pci(cfg); - if (rc) { - dev_err(dev, "%s: init_pci failed rc=%d\n", __func__, rc); - goto out_remove; - } - cfg->init_state = INIT_STATE_PCI; - - cfg->afu_cookie = cfg->ops->create_afu(pdev); - if (unlikely(!cfg->afu_cookie)) { - dev_err(dev, "%s: create_afu failed\n", __func__); - rc = -ENOMEM; - goto out_remove; - } - - rc = init_afu(cfg); - if (rc && !wq_has_sleeper(&cfg->reset_waitq)) { - dev_err(dev, "%s: init_afu failed rc=%d\n", __func__, rc); - goto out_remove; - } - cfg->init_state = INIT_STATE_AFU; - - rc = init_scsi(cfg); - if (rc) { - dev_err(dev, "%s: init_scsi failed rc=%d\n", __func__, rc); - goto out_remove; - } - cfg->init_state = INIT_STATE_SCSI; - - rc = init_chrdev(cfg); - if (rc) { - dev_err(dev, "%s: init_chrdev failed rc=%d\n", __func__, rc); - goto out_remove; - } - cfg->init_state = INIT_STATE_CDEV; - - if (wq_has_sleeper(&cfg->reset_waitq)) { - cfg->state = STATE_PROBED; - wake_up_all(&cfg->reset_waitq); - } else - cfg->state = STATE_NORMAL; -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; - -out_remove: - cfg->state = STATE_PROBED; - cxlflash_remove(pdev); - goto out; -} - -/** - * cxlflash_pci_error_detected() - called when a PCI error is detected - * @pdev: PCI device struct. - * @state: PCI channel state. - * - * When an EEH occurs during an active reset, wait until the reset is - * complete and then take action based upon the device state. - * - * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT - */ -static pci_ers_result_t cxlflash_pci_error_detected(struct pci_dev *pdev, - pci_channel_state_t state) -{ - int rc = 0; - struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); - struct device *dev = &cfg->dev->dev; - - dev_dbg(dev, "%s: pdev=%p state=%u\n", __func__, pdev, state); - - switch (state) { - case pci_channel_io_frozen: - wait_event(cfg->reset_waitq, cfg->state != STATE_RESET && - cfg->state != STATE_PROBING); - if (cfg->state == STATE_FAILTERM) - return PCI_ERS_RESULT_DISCONNECT; - - cfg->state = STATE_RESET; - scsi_block_requests(cfg->host); - drain_ioctls(cfg); - rc = cxlflash_mark_contexts_error(cfg); - if (unlikely(rc)) - dev_err(dev, "%s: Failed to mark user contexts rc=%d\n", - __func__, rc); - term_afu(cfg); - return PCI_ERS_RESULT_NEED_RESET; - case pci_channel_io_perm_failure: - cfg->state = STATE_FAILTERM; - wake_up_all(&cfg->reset_waitq); - scsi_unblock_requests(cfg->host); - return PCI_ERS_RESULT_DISCONNECT; - default: - break; - } - return PCI_ERS_RESULT_NEED_RESET; -} - -/** - * cxlflash_pci_slot_reset() - called when PCI slot has been reset - * @pdev: PCI device struct. - * - * This routine is called by the pci error recovery code after the PCI - * slot has been reset, just before we should resume normal operations. - * - * Return: PCI_ERS_RESULT_RECOVERED or PCI_ERS_RESULT_DISCONNECT - */ -static pci_ers_result_t cxlflash_pci_slot_reset(struct pci_dev *pdev) -{ - int rc = 0; - struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); - struct device *dev = &cfg->dev->dev; - - dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); - - rc = init_afu(cfg); - if (unlikely(rc)) { - dev_err(dev, "%s: EEH recovery failed rc=%d\n", __func__, rc); - return PCI_ERS_RESULT_DISCONNECT; - } - - return PCI_ERS_RESULT_RECOVERED; -} - -/** - * cxlflash_pci_resume() - called when normal operation can resume - * @pdev: PCI device struct - */ -static void cxlflash_pci_resume(struct pci_dev *pdev) -{ - struct cxlflash_cfg *cfg = pci_get_drvdata(pdev); - struct device *dev = &cfg->dev->dev; - - dev_dbg(dev, "%s: pdev=%p\n", __func__, pdev); - - cfg->state = STATE_NORMAL; - wake_up_all(&cfg->reset_waitq); - scsi_unblock_requests(cfg->host); -} - -/** - * cxlflash_devnode() - provides devtmpfs for devices in the cxlflash class - * @dev: Character device. - * @mode: Mode that can be used to verify access. - * - * Return: Allocated string describing the devtmpfs structure. - */ -static char *cxlflash_devnode(const struct device *dev, umode_t *mode) -{ - return kasprintf(GFP_KERNEL, "cxlflash/%s", dev_name(dev)); -} - -/** - * cxlflash_class_init() - create character device class - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_class_init(void) -{ - dev_t devno; - int rc = 0; - - rc = alloc_chrdev_region(&devno, 0, CXLFLASH_MAX_ADAPTERS, "cxlflash"); - if (unlikely(rc)) { - pr_err("%s: alloc_chrdev_region failed rc=%d\n", __func__, rc); - goto out; - } - - cxlflash_major = MAJOR(devno); - - rc = class_register(&cxlflash_class); - if (rc) { - pr_err("%s: class_create failed rc=%d\n", __func__, rc); - goto err; - } - -out: - pr_debug("%s: returning rc=%d\n", __func__, rc); - return rc; -err: - unregister_chrdev_region(devno, CXLFLASH_MAX_ADAPTERS); - goto out; -} - -/** - * cxlflash_class_exit() - destroy character device class - */ -static void cxlflash_class_exit(void) -{ - dev_t devno = MKDEV(cxlflash_major, 0); - - class_unregister(&cxlflash_class); - unregister_chrdev_region(devno, CXLFLASH_MAX_ADAPTERS); -} - -static const struct pci_error_handlers cxlflash_err_handler = { - .error_detected = cxlflash_pci_error_detected, - .slot_reset = cxlflash_pci_slot_reset, - .resume = cxlflash_pci_resume, -}; - -/* - * PCI device structure - */ -static struct pci_driver cxlflash_driver = { - .name = CXLFLASH_NAME, - .id_table = cxlflash_pci_table, - .probe = cxlflash_probe, - .remove = cxlflash_remove, - .shutdown = cxlflash_remove, - .err_handler = &cxlflash_err_handler, -}; - -/** - * init_cxlflash() - module entry point - * - * Return: 0 on success, -errno on failure - */ -static int __init init_cxlflash(void) -{ - int rc; - - check_sizes(); - cxlflash_list_init(); - rc = cxlflash_class_init(); - if (unlikely(rc)) - goto out; - - rc = pci_register_driver(&cxlflash_driver); - if (unlikely(rc)) - goto err; -out: - pr_debug("%s: returning rc=%d\n", __func__, rc); - return rc; -err: - cxlflash_class_exit(); - goto out; -} - -/** - * exit_cxlflash() - module exit point - */ -static void __exit exit_cxlflash(void) -{ - cxlflash_term_global_luns(); - cxlflash_free_errpage(); - - pci_unregister_driver(&cxlflash_driver); - cxlflash_class_exit(); -} - -module_init(init_cxlflash); -module_exit(exit_cxlflash); diff --git a/drivers/scsi/cxlflash/main.h b/drivers/scsi/cxlflash/main.h deleted file mode 100644 index 0bfb98effce0..000000000000 --- a/drivers/scsi/cxlflash/main.h +++ /dev/null @@ -1,129 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#ifndef _CXLFLASH_MAIN_H -#define _CXLFLASH_MAIN_H - -#include <linux/list.h> -#include <linux/types.h> -#include <scsi/scsi.h> -#include <scsi/scsi_device.h> - -#include "backend.h" - -#define CXLFLASH_NAME "cxlflash" -#define CXLFLASH_ADAPTER_NAME "IBM POWER CXL Flash Adapter" -#define CXLFLASH_MAX_ADAPTERS 32 - -#define PCI_DEVICE_ID_IBM_CORSA 0x04F0 -#define PCI_DEVICE_ID_IBM_FLASH_GT 0x0600 -#define PCI_DEVICE_ID_IBM_BRIARD 0x0624 - -/* Since there is only one target, make it 0 */ -#define CXLFLASH_TARGET 0 -#define CXLFLASH_MAX_CDB_LEN 16 - -/* Really only one target per bus since the Texan is directly attached */ -#define CXLFLASH_MAX_NUM_TARGETS_PER_BUS 1 -#define CXLFLASH_MAX_NUM_LUNS_PER_TARGET 65536 - -#define CXLFLASH_PCI_ERROR_RECOVERY_TIMEOUT (120 * HZ) - -/* FC defines */ -#define FC_MTIP_CMDCONFIG 0x010 -#define FC_MTIP_STATUS 0x018 -#define FC_MAX_NUM_LUNS 0x080 /* Max LUNs host can provision for port */ -#define FC_CUR_NUM_LUNS 0x088 /* Cur number LUNs provisioned for port */ -#define FC_MAX_CAP_PORT 0x090 /* Max capacity all LUNs for port (4K blocks) */ -#define FC_CUR_CAP_PORT 0x098 /* Cur capacity all LUNs for port (4K blocks) */ - -#define FC_PNAME 0x300 -#define FC_CONFIG 0x320 -#define FC_CONFIG2 0x328 -#define FC_STATUS 0x330 -#define FC_ERROR 0x380 -#define FC_ERRCAP 0x388 -#define FC_ERRMSK 0x390 -#define FC_CNT_CRCERR 0x538 -#define FC_CRC_THRESH 0x580 - -#define FC_MTIP_CMDCONFIG_ONLINE 0x20ULL -#define FC_MTIP_CMDCONFIG_OFFLINE 0x40ULL - -#define FC_MTIP_STATUS_MASK 0x30ULL -#define FC_MTIP_STATUS_ONLINE 0x20ULL -#define FC_MTIP_STATUS_OFFLINE 0x10ULL - -/* TIMEOUT and RETRY definitions */ - -/* AFU command timeout values */ -#define MC_AFU_SYNC_TIMEOUT 5 /* 5 secs */ -#define MC_LUN_PROV_TIMEOUT 5 /* 5 secs */ -#define MC_AFU_DEBUG_TIMEOUT 5 /* 5 secs */ - -/* AFU command room retry limit */ -#define MC_ROOM_RETRY_CNT 10 - -/* FC CRC clear periodic timer */ -#define MC_CRC_THRESH 100 /* threshold in 5 mins */ - -#define FC_PORT_STATUS_RETRY_CNT 100 /* 100 100ms retries = 10 seconds */ -#define FC_PORT_STATUS_RETRY_INTERVAL_US 100000 /* microseconds */ - -/* VPD defines */ -#define CXLFLASH_VPD_LEN 256 -#define WWPN_LEN 16 -#define WWPN_BUF_LEN (WWPN_LEN + 1) - -enum undo_level { - UNDO_NOOP = 0, - FREE_IRQ, - UNMAP_ONE, - UNMAP_TWO, - UNMAP_THREE -}; - -struct dev_dependent_vals { - u64 max_sectors; - u64 flags; -#define CXLFLASH_NOTIFY_SHUTDOWN 0x0000000000000001ULL -#define CXLFLASH_WWPN_VPD_REQUIRED 0x0000000000000002ULL -#define CXLFLASH_OCXL_DEV 0x0000000000000004ULL -}; - -static inline const struct cxlflash_backend_ops * -cxlflash_assign_ops(struct dev_dependent_vals *ddv) -{ - const struct cxlflash_backend_ops *ops = NULL; - -#ifdef CONFIG_OCXL_BASE - if (ddv->flags & CXLFLASH_OCXL_DEV) - ops = &cxlflash_ocxl_ops; -#endif - -#ifdef CONFIG_CXL_BASE - if (!(ddv->flags & CXLFLASH_OCXL_DEV)) - ops = &cxlflash_cxl_ops; -#endif - - return ops; -} - -struct asyc_intr_info { - u64 status; - char *desc; - u8 port; - u8 action; -#define CLR_FC_ERROR 0x01 -#define LINK_RESET 0x02 -#define SCAN_HOST 0x04 -}; - -#endif /* _CXLFLASH_MAIN_H */ diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c deleted file mode 100644 index 6542818e595a..000000000000 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ /dev/null @@ -1,1399 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2018 IBM Corporation - */ - -#include <linux/file.h> -#include <linux/idr.h> -#include <linux/module.h> -#include <linux/mount.h> -#include <linux/pseudo_fs.h> -#include <linux/poll.h> -#include <linux/sched/signal.h> -#include <linux/interrupt.h> -#include <linux/irqdomain.h> -#include <asm/xive.h> -#include <misc/ocxl.h> - -#include <uapi/misc/cxl.h> - -#include "backend.h" -#include "ocxl_hw.h" - -/* - * Pseudo-filesystem to allocate inodes. - */ - -#define OCXLFLASH_FS_MAGIC 0x1697698f - -static int ocxlflash_fs_cnt; -static struct vfsmount *ocxlflash_vfs_mount; - -static int ocxlflash_fs_init_fs_context(struct fs_context *fc) -{ - return init_pseudo(fc, OCXLFLASH_FS_MAGIC) ? 0 : -ENOMEM; -} - -static struct file_system_type ocxlflash_fs_type = { - .name = "ocxlflash", - .owner = THIS_MODULE, - .init_fs_context = ocxlflash_fs_init_fs_context, - .kill_sb = kill_anon_super, -}; - -/* - * ocxlflash_release_mapping() - release the memory mapping - * @ctx: Context whose mapping is to be released. - */ -static void ocxlflash_release_mapping(struct ocxlflash_context *ctx) -{ - if (ctx->mapping) - simple_release_fs(&ocxlflash_vfs_mount, &ocxlflash_fs_cnt); - ctx->mapping = NULL; -} - -/* - * ocxlflash_getfile() - allocate pseudo filesystem, inode, and the file - * @dev: Generic device of the host. - * @name: Name of the pseudo filesystem. - * @fops: File operations. - * @priv: Private data. - * @flags: Flags for the file. - * - * Return: pointer to the file on success, ERR_PTR on failure - */ -static struct file *ocxlflash_getfile(struct device *dev, const char *name, - const struct file_operations *fops, - void *priv, int flags) -{ - struct file *file; - struct inode *inode; - int rc; - - if (fops->owner && !try_module_get(fops->owner)) { - dev_err(dev, "%s: Owner does not exist\n", __func__); - rc = -ENOENT; - goto err1; - } - - rc = simple_pin_fs(&ocxlflash_fs_type, &ocxlflash_vfs_mount, - &ocxlflash_fs_cnt); - if (unlikely(rc < 0)) { - dev_err(dev, "%s: Cannot mount ocxlflash pseudofs rc=%d\n", - __func__, rc); - goto err2; - } - - inode = alloc_anon_inode(ocxlflash_vfs_mount->mnt_sb); - if (IS_ERR(inode)) { - rc = PTR_ERR(inode); - dev_err(dev, "%s: alloc_anon_inode failed rc=%d\n", - __func__, rc); - goto err3; - } - - file = alloc_file_pseudo(inode, ocxlflash_vfs_mount, name, - flags & (O_ACCMODE | O_NONBLOCK), fops); - if (IS_ERR(file)) { - rc = PTR_ERR(file); - dev_err(dev, "%s: alloc_file failed rc=%d\n", - __func__, rc); - goto err4; - } - - file->private_data = priv; -out: - return file; -err4: - iput(inode); -err3: - simple_release_fs(&ocxlflash_vfs_mount, &ocxlflash_fs_cnt); -err2: - module_put(fops->owner); -err1: - file = ERR_PTR(rc); - goto out; -} - -/** - * ocxlflash_psa_map() - map the process specific MMIO space - * @ctx_cookie: Adapter context for which the mapping needs to be done. - * - * Return: MMIO pointer of the mapped region - */ -static void __iomem *ocxlflash_psa_map(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct device *dev = ctx->hw_afu->dev; - - mutex_lock(&ctx->state_mutex); - if (ctx->state != STARTED) { - dev_err(dev, "%s: Context not started, state=%d\n", __func__, - ctx->state); - mutex_unlock(&ctx->state_mutex); - return NULL; - } - mutex_unlock(&ctx->state_mutex); - - return ioremap(ctx->psn_phys, ctx->psn_size); -} - -/** - * ocxlflash_psa_unmap() - unmap the process specific MMIO space - * @addr: MMIO pointer to unmap. - */ -static void ocxlflash_psa_unmap(void __iomem *addr) -{ - iounmap(addr); -} - -/** - * ocxlflash_process_element() - get process element of the adapter context - * @ctx_cookie: Adapter context associated with the process element. - * - * Return: process element of the adapter context - */ -static int ocxlflash_process_element(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - - return ctx->pe; -} - -/** - * afu_map_irq() - map the interrupt of the adapter context - * @flags: Flags. - * @ctx: Adapter context. - * @num: Per-context AFU interrupt number. - * @handler: Interrupt handler to register. - * @cookie: Interrupt handler private data. - * @name: Name of the interrupt. - * - * Return: 0 on success, -errno on failure - */ -static int afu_map_irq(u64 flags, struct ocxlflash_context *ctx, int num, - irq_handler_t handler, void *cookie, char *name) -{ - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct device *dev = afu->dev; - struct ocxlflash_irqs *irq; - struct xive_irq_data *xd; - u32 virq; - int rc = 0; - - if (num < 0 || num >= ctx->num_irqs) { - dev_err(dev, "%s: Interrupt %d not allocated\n", __func__, num); - rc = -ENOENT; - goto out; - } - - irq = &ctx->irqs[num]; - virq = irq_create_mapping(NULL, irq->hwirq); - if (unlikely(!virq)) { - dev_err(dev, "%s: irq_create_mapping failed\n", __func__); - rc = -ENOMEM; - goto out; - } - - rc = request_irq(virq, handler, 0, name, cookie); - if (unlikely(rc)) { - dev_err(dev, "%s: request_irq failed rc=%d\n", __func__, rc); - goto err1; - } - - xd = irq_get_handler_data(virq); - if (unlikely(!xd)) { - dev_err(dev, "%s: Can't get interrupt data\n", __func__); - rc = -ENXIO; - goto err2; - } - - irq->virq = virq; - irq->vtrig = xd->trig_mmio; -out: - return rc; -err2: - free_irq(virq, cookie); -err1: - irq_dispose_mapping(virq); - goto out; -} - -/** - * ocxlflash_map_afu_irq() - map the interrupt of the adapter context - * @ctx_cookie: Adapter context. - * @num: Per-context AFU interrupt number. - * @handler: Interrupt handler to register. - * @cookie: Interrupt handler private data. - * @name: Name of the interrupt. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_map_afu_irq(void *ctx_cookie, int num, - irq_handler_t handler, void *cookie, - char *name) -{ - return afu_map_irq(0, ctx_cookie, num, handler, cookie, name); -} - -/** - * afu_unmap_irq() - unmap the interrupt - * @flags: Flags. - * @ctx: Adapter context. - * @num: Per-context AFU interrupt number. - * @cookie: Interrupt handler private data. - */ -static void afu_unmap_irq(u64 flags, struct ocxlflash_context *ctx, int num, - void *cookie) -{ - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct device *dev = afu->dev; - struct ocxlflash_irqs *irq; - - if (num < 0 || num >= ctx->num_irqs) { - dev_err(dev, "%s: Interrupt %d not allocated\n", __func__, num); - return; - } - - irq = &ctx->irqs[num]; - - if (irq_find_mapping(NULL, irq->hwirq)) { - free_irq(irq->virq, cookie); - irq_dispose_mapping(irq->virq); - } - - memset(irq, 0, sizeof(*irq)); -} - -/** - * ocxlflash_unmap_afu_irq() - unmap the interrupt - * @ctx_cookie: Adapter context. - * @num: Per-context AFU interrupt number. - * @cookie: Interrupt handler private data. - */ -static void ocxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie) -{ - return afu_unmap_irq(0, ctx_cookie, num, cookie); -} - -/** - * ocxlflash_get_irq_objhndl() - get the object handle for an interrupt - * @ctx_cookie: Context associated with the interrupt. - * @irq: Interrupt number. - * - * Return: effective address of the mapped region - */ -static u64 ocxlflash_get_irq_objhndl(void *ctx_cookie, int irq) -{ - struct ocxlflash_context *ctx = ctx_cookie; - - if (irq < 0 || irq >= ctx->num_irqs) - return 0; - - return (__force u64)ctx->irqs[irq].vtrig; -} - -/** - * ocxlflash_xsl_fault() - callback when translation error is triggered - * @data: Private data provided at callback registration, the context. - * @addr: Address that triggered the error. - * @dsisr: Value of dsisr register. - */ -static void ocxlflash_xsl_fault(void *data, u64 addr, u64 dsisr) -{ - struct ocxlflash_context *ctx = data; - - spin_lock(&ctx->slock); - ctx->fault_addr = addr; - ctx->fault_dsisr = dsisr; - ctx->pending_fault = true; - spin_unlock(&ctx->slock); - - wake_up_all(&ctx->wq); -} - -/** - * start_context() - local routine to start a context - * @ctx: Adapter context to be started. - * - * Assign the context specific MMIO space, add and enable the PE. - * - * Return: 0 on success, -errno on failure - */ -static int start_context(struct ocxlflash_context *ctx) -{ - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct ocxl_afu_config *acfg = &afu->acfg; - void *link_token = afu->link_token; - struct pci_dev *pdev = afu->pdev; - struct device *dev = afu->dev; - bool master = ctx->master; - struct mm_struct *mm; - int rc = 0; - u32 pid; - - mutex_lock(&ctx->state_mutex); - if (ctx->state != OPENED) { - dev_err(dev, "%s: Context state invalid, state=%d\n", - __func__, ctx->state); - rc = -EINVAL; - goto out; - } - - if (master) { - ctx->psn_size = acfg->global_mmio_size; - ctx->psn_phys = afu->gmmio_phys; - } else { - ctx->psn_size = acfg->pp_mmio_stride; - ctx->psn_phys = afu->ppmmio_phys + (ctx->pe * ctx->psn_size); - } - - /* pid and mm not set for master contexts */ - if (master) { - pid = 0; - mm = NULL; - } else { - pid = current->mm->context.id; - mm = current->mm; - } - - rc = ocxl_link_add_pe(link_token, ctx->pe, pid, 0, 0, - pci_dev_id(pdev), mm, ocxlflash_xsl_fault, - ctx); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_link_add_pe failed rc=%d\n", - __func__, rc); - goto out; - } - - ctx->state = STARTED; -out: - mutex_unlock(&ctx->state_mutex); - return rc; -} - -/** - * ocxlflash_start_context() - start a kernel context - * @ctx_cookie: Adapter context to be started. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_start_context(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - - return start_context(ctx); -} - -/** - * ocxlflash_stop_context() - stop a context - * @ctx_cookie: Adapter context to be stopped. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_stop_context(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct ocxl_afu_config *acfg = &afu->acfg; - struct pci_dev *pdev = afu->pdev; - struct device *dev = afu->dev; - enum ocxlflash_ctx_state state; - int rc = 0; - - mutex_lock(&ctx->state_mutex); - state = ctx->state; - ctx->state = CLOSED; - mutex_unlock(&ctx->state_mutex); - if (state != STARTED) - goto out; - - rc = ocxl_config_terminate_pasid(pdev, acfg->dvsec_afu_control_pos, - ctx->pe); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_config_terminate_pasid failed rc=%d\n", - __func__, rc); - /* If EBUSY, PE could be referenced in future by the AFU */ - if (rc == -EBUSY) - goto out; - } - - rc = ocxl_link_remove_pe(afu->link_token, ctx->pe); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_link_remove_pe failed rc=%d\n", - __func__, rc); - goto out; - } -out: - return rc; -} - -/** - * ocxlflash_afu_reset() - reset the AFU - * @ctx_cookie: Adapter context. - */ -static int ocxlflash_afu_reset(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct device *dev = ctx->hw_afu->dev; - - /* Pending implementation from OCXL transport services */ - dev_err_once(dev, "%s: afu_reset() fop not supported\n", __func__); - - /* Silently return success until it is implemented */ - return 0; -} - -/** - * ocxlflash_set_master() - sets the context as master - * @ctx_cookie: Adapter context to set as master. - */ -static void ocxlflash_set_master(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - - ctx->master = true; -} - -/** - * ocxlflash_get_context() - obtains the context associated with the host - * @pdev: PCI device associated with the host. - * @afu_cookie: Hardware AFU associated with the host. - * - * Return: returns the pointer to host adapter context - */ -static void *ocxlflash_get_context(struct pci_dev *pdev, void *afu_cookie) -{ - struct ocxl_hw_afu *afu = afu_cookie; - - return afu->ocxl_ctx; -} - -/** - * ocxlflash_dev_context_init() - allocate and initialize an adapter context - * @pdev: PCI device associated with the host. - * @afu_cookie: Hardware AFU associated with the host. - * - * Return: returns the adapter context on success, ERR_PTR on failure - */ -static void *ocxlflash_dev_context_init(struct pci_dev *pdev, void *afu_cookie) -{ - struct ocxl_hw_afu *afu = afu_cookie; - struct device *dev = afu->dev; - struct ocxlflash_context *ctx; - int rc; - - ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); - if (unlikely(!ctx)) { - dev_err(dev, "%s: Context allocation failed\n", __func__); - rc = -ENOMEM; - goto err1; - } - - idr_preload(GFP_KERNEL); - rc = idr_alloc(&afu->idr, ctx, 0, afu->max_pasid, GFP_NOWAIT); - idr_preload_end(); - if (unlikely(rc < 0)) { - dev_err(dev, "%s: idr_alloc failed rc=%d\n", __func__, rc); - goto err2; - } - - spin_lock_init(&ctx->slock); - init_waitqueue_head(&ctx->wq); - mutex_init(&ctx->state_mutex); - - ctx->state = OPENED; - ctx->pe = rc; - ctx->master = false; - ctx->mapping = NULL; - ctx->hw_afu = afu; - ctx->irq_bitmap = 0; - ctx->pending_irq = false; - ctx->pending_fault = false; -out: - return ctx; -err2: - kfree(ctx); -err1: - ctx = ERR_PTR(rc); - goto out; -} - -/** - * ocxlflash_release_context() - releases an adapter context - * @ctx_cookie: Adapter context to be released. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_release_context(void *ctx_cookie) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct device *dev; - int rc = 0; - - if (!ctx) - goto out; - - dev = ctx->hw_afu->dev; - mutex_lock(&ctx->state_mutex); - if (ctx->state >= STARTED) { - dev_err(dev, "%s: Context in use, state=%d\n", __func__, - ctx->state); - mutex_unlock(&ctx->state_mutex); - rc = -EBUSY; - goto out; - } - mutex_unlock(&ctx->state_mutex); - - idr_remove(&ctx->hw_afu->idr, ctx->pe); - ocxlflash_release_mapping(ctx); - kfree(ctx); -out: - return rc; -} - -/** - * ocxlflash_perst_reloads_same_image() - sets the image reload policy - * @afu_cookie: Hardware AFU associated with the host. - * @image: Whether to load the same image on PERST. - */ -static void ocxlflash_perst_reloads_same_image(void *afu_cookie, bool image) -{ - struct ocxl_hw_afu *afu = afu_cookie; - - afu->perst_same_image = image; -} - -/** - * ocxlflash_read_adapter_vpd() - reads the adapter VPD - * @pdev: PCI device associated with the host. - * @buf: Buffer to get the VPD data. - * @count: Size of buffer (maximum bytes that can be read). - * - * Return: size of VPD on success, -errno on failure - */ -static ssize_t ocxlflash_read_adapter_vpd(struct pci_dev *pdev, void *buf, - size_t count) -{ - return pci_read_vpd(pdev, 0, count, buf); -} - -/** - * free_afu_irqs() - internal service to free interrupts - * @ctx: Adapter context. - */ -static void free_afu_irqs(struct ocxlflash_context *ctx) -{ - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct device *dev = afu->dev; - int i; - - if (!ctx->irqs) { - dev_err(dev, "%s: Interrupts not allocated\n", __func__); - return; - } - - for (i = ctx->num_irqs; i >= 0; i--) - ocxl_link_free_irq(afu->link_token, ctx->irqs[i].hwirq); - - kfree(ctx->irqs); - ctx->irqs = NULL; -} - -/** - * alloc_afu_irqs() - internal service to allocate interrupts - * @ctx: Context associated with the request. - * @num: Number of interrupts requested. - * - * Return: 0 on success, -errno on failure - */ -static int alloc_afu_irqs(struct ocxlflash_context *ctx, int num) -{ - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct device *dev = afu->dev; - struct ocxlflash_irqs *irqs; - int rc = 0; - int hwirq; - int i; - - if (ctx->irqs) { - dev_err(dev, "%s: Interrupts already allocated\n", __func__); - rc = -EEXIST; - goto out; - } - - if (num > OCXL_MAX_IRQS) { - dev_err(dev, "%s: Too many interrupts num=%d\n", __func__, num); - rc = -EINVAL; - goto out; - } - - irqs = kcalloc(num, sizeof(*irqs), GFP_KERNEL); - if (unlikely(!irqs)) { - dev_err(dev, "%s: Context irqs allocation failed\n", __func__); - rc = -ENOMEM; - goto out; - } - - for (i = 0; i < num; i++) { - rc = ocxl_link_irq_alloc(afu->link_token, &hwirq); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_link_irq_alloc failed rc=%d\n", - __func__, rc); - goto err; - } - - irqs[i].hwirq = hwirq; - } - - ctx->irqs = irqs; - ctx->num_irqs = num; -out: - return rc; -err: - for (i = i-1; i >= 0; i--) - ocxl_link_free_irq(afu->link_token, irqs[i].hwirq); - kfree(irqs); - goto out; -} - -/** - * ocxlflash_allocate_afu_irqs() - allocates the requested number of interrupts - * @ctx_cookie: Context associated with the request. - * @num: Number of interrupts requested. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_allocate_afu_irqs(void *ctx_cookie, int num) -{ - return alloc_afu_irqs(ctx_cookie, num); -} - -/** - * ocxlflash_free_afu_irqs() - frees the interrupts of an adapter context - * @ctx_cookie: Adapter context. - */ -static void ocxlflash_free_afu_irqs(void *ctx_cookie) -{ - free_afu_irqs(ctx_cookie); -} - -/** - * ocxlflash_unconfig_afu() - unconfigure the AFU - * @afu: AFU associated with the host. - */ -static void ocxlflash_unconfig_afu(struct ocxl_hw_afu *afu) -{ - if (afu->gmmio_virt) { - iounmap(afu->gmmio_virt); - afu->gmmio_virt = NULL; - } -} - -/** - * ocxlflash_destroy_afu() - destroy the AFU structure - * @afu_cookie: AFU to be freed. - */ -static void ocxlflash_destroy_afu(void *afu_cookie) -{ - struct ocxl_hw_afu *afu = afu_cookie; - int pos; - - if (!afu) - return; - - ocxlflash_release_context(afu->ocxl_ctx); - idr_destroy(&afu->idr); - - /* Disable the AFU */ - pos = afu->acfg.dvsec_afu_control_pos; - ocxl_config_set_afu_state(afu->pdev, pos, 0); - - ocxlflash_unconfig_afu(afu); - kfree(afu); -} - -/** - * ocxlflash_config_fn() - configure the host function - * @pdev: PCI device associated with the host. - * @afu: AFU associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_config_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu) -{ - struct ocxl_fn_config *fcfg = &afu->fcfg; - struct device *dev = &pdev->dev; - u16 base, enabled, supported; - int rc = 0; - - /* Read DVSEC config of the function */ - rc = ocxl_config_read_function(pdev, fcfg); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_config_read_function failed rc=%d\n", - __func__, rc); - goto out; - } - - /* Check if function has AFUs defined, only 1 per function supported */ - if (fcfg->max_afu_index >= 0) { - afu->is_present = true; - if (fcfg->max_afu_index != 0) - dev_warn(dev, "%s: Unexpected AFU index value %d\n", - __func__, fcfg->max_afu_index); - } - - rc = ocxl_config_get_actag_info(pdev, &base, &enabled, &supported); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_config_get_actag_info failed rc=%d\n", - __func__, rc); - goto out; - } - - afu->fn_actag_base = base; - afu->fn_actag_enabled = enabled; - - ocxl_config_set_actag(pdev, fcfg->dvsec_function_pos, base, enabled); - dev_dbg(dev, "%s: Function acTag range base=%u enabled=%u\n", - __func__, base, enabled); - - rc = ocxl_link_setup(pdev, 0, &afu->link_token); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_link_setup failed rc=%d\n", - __func__, rc); - goto out; - } - - rc = ocxl_config_set_TL(pdev, fcfg->dvsec_tl_pos); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_config_set_TL failed rc=%d\n", - __func__, rc); - goto err; - } -out: - return rc; -err: - ocxl_link_release(pdev, afu->link_token); - goto out; -} - -/** - * ocxlflash_unconfig_fn() - unconfigure the host function - * @pdev: PCI device associated with the host. - * @afu: AFU associated with the host. - */ -static void ocxlflash_unconfig_fn(struct pci_dev *pdev, struct ocxl_hw_afu *afu) -{ - ocxl_link_release(pdev, afu->link_token); -} - -/** - * ocxlflash_map_mmio() - map the AFU MMIO space - * @afu: AFU associated with the host. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_map_mmio(struct ocxl_hw_afu *afu) -{ - struct ocxl_afu_config *acfg = &afu->acfg; - struct pci_dev *pdev = afu->pdev; - struct device *dev = afu->dev; - phys_addr_t gmmio, ppmmio; - int rc = 0; - - rc = pci_request_region(pdev, acfg->global_mmio_bar, "ocxlflash"); - if (unlikely(rc)) { - dev_err(dev, "%s: pci_request_region for global failed rc=%d\n", - __func__, rc); - goto out; - } - gmmio = pci_resource_start(pdev, acfg->global_mmio_bar); - gmmio += acfg->global_mmio_offset; - - rc = pci_request_region(pdev, acfg->pp_mmio_bar, "ocxlflash"); - if (unlikely(rc)) { - dev_err(dev, "%s: pci_request_region for pp bar failed rc=%d\n", - __func__, rc); - goto err1; - } - ppmmio = pci_resource_start(pdev, acfg->pp_mmio_bar); - ppmmio += acfg->pp_mmio_offset; - - afu->gmmio_virt = ioremap(gmmio, acfg->global_mmio_size); - if (unlikely(!afu->gmmio_virt)) { - dev_err(dev, "%s: MMIO mapping failed\n", __func__); - rc = -ENOMEM; - goto err2; - } - - afu->gmmio_phys = gmmio; - afu->ppmmio_phys = ppmmio; -out: - return rc; -err2: - pci_release_region(pdev, acfg->pp_mmio_bar); -err1: - pci_release_region(pdev, acfg->global_mmio_bar); - goto out; -} - -/** - * ocxlflash_config_afu() - configure the host AFU - * @pdev: PCI device associated with the host. - * @afu: AFU associated with the host. - * - * Must be called _after_ host function configuration. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_config_afu(struct pci_dev *pdev, struct ocxl_hw_afu *afu) -{ - struct ocxl_afu_config *acfg = &afu->acfg; - struct ocxl_fn_config *fcfg = &afu->fcfg; - struct device *dev = &pdev->dev; - int count; - int base; - int pos; - int rc = 0; - - /* This HW AFU function does not have any AFUs defined */ - if (!afu->is_present) - goto out; - - /* Read AFU config at index 0 */ - rc = ocxl_config_read_afu(pdev, fcfg, acfg, 0); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxl_config_read_afu failed rc=%d\n", - __func__, rc); - goto out; - } - - /* Only one AFU per function is supported, so actag_base is same */ - base = afu->fn_actag_base; - count = min_t(int, acfg->actag_supported, afu->fn_actag_enabled); - pos = acfg->dvsec_afu_control_pos; - - ocxl_config_set_afu_actag(pdev, pos, base, count); - dev_dbg(dev, "%s: acTag base=%d enabled=%d\n", __func__, base, count); - afu->afu_actag_base = base; - afu->afu_actag_enabled = count; - afu->max_pasid = 1 << acfg->pasid_supported_log; - - ocxl_config_set_afu_pasid(pdev, pos, 0, acfg->pasid_supported_log); - - rc = ocxlflash_map_mmio(afu); - if (unlikely(rc)) { - dev_err(dev, "%s: ocxlflash_map_mmio failed rc=%d\n", - __func__, rc); - goto out; - } - - /* Enable the AFU */ - ocxl_config_set_afu_state(pdev, acfg->dvsec_afu_control_pos, 1); -out: - return rc; -} - -/** - * ocxlflash_create_afu() - create the AFU for OCXL - * @pdev: PCI device associated with the host. - * - * Return: AFU on success, NULL on failure - */ -static void *ocxlflash_create_afu(struct pci_dev *pdev) -{ - struct device *dev = &pdev->dev; - struct ocxlflash_context *ctx; - struct ocxl_hw_afu *afu; - int rc; - - afu = kzalloc(sizeof(*afu), GFP_KERNEL); - if (unlikely(!afu)) { - dev_err(dev, "%s: HW AFU allocation failed\n", __func__); - goto out; - } - - afu->pdev = pdev; - afu->dev = dev; - idr_init(&afu->idr); - - rc = ocxlflash_config_fn(pdev, afu); - if (unlikely(rc)) { - dev_err(dev, "%s: Function configuration failed rc=%d\n", - __func__, rc); - goto err1; - } - - rc = ocxlflash_config_afu(pdev, afu); - if (unlikely(rc)) { - dev_err(dev, "%s: AFU configuration failed rc=%d\n", - __func__, rc); - goto err2; - } - - ctx = ocxlflash_dev_context_init(pdev, afu); - if (IS_ERR(ctx)) { - rc = PTR_ERR(ctx); - dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n", - __func__, rc); - goto err3; - } - - afu->ocxl_ctx = ctx; -out: - return afu; -err3: - ocxlflash_unconfig_afu(afu); -err2: - ocxlflash_unconfig_fn(pdev, afu); -err1: - idr_destroy(&afu->idr); - kfree(afu); - afu = NULL; - goto out; -} - -/** - * ctx_event_pending() - check for any event pending on the context - * @ctx: Context to be checked. - * - * Return: true if there is an event pending, false if none pending - */ -static inline bool ctx_event_pending(struct ocxlflash_context *ctx) -{ - if (ctx->pending_irq || ctx->pending_fault) - return true; - - return false; -} - -/** - * afu_poll() - poll the AFU for events on the context - * @file: File associated with the adapter context. - * @poll: Poll structure from the user. - * - * Return: poll mask - */ -static unsigned int afu_poll(struct file *file, struct poll_table_struct *poll) -{ - struct ocxlflash_context *ctx = file->private_data; - struct device *dev = ctx->hw_afu->dev; - ulong lock_flags; - int mask = 0; - - poll_wait(file, &ctx->wq, poll); - - spin_lock_irqsave(&ctx->slock, lock_flags); - if (ctx_event_pending(ctx)) - mask |= POLLIN | POLLRDNORM; - else if (ctx->state == CLOSED) - mask |= POLLERR; - spin_unlock_irqrestore(&ctx->slock, lock_flags); - - dev_dbg(dev, "%s: Poll wait completed for pe %i mask %i\n", - __func__, ctx->pe, mask); - - return mask; -} - -/** - * afu_read() - perform a read on the context for any event - * @file: File associated with the adapter context. - * @buf: Buffer to receive the data. - * @count: Size of buffer (maximum bytes that can be read). - * @off: Offset. - * - * Return: size of the data read on success, -errno on failure - */ -static ssize_t afu_read(struct file *file, char __user *buf, size_t count, - loff_t *off) -{ - struct ocxlflash_context *ctx = file->private_data; - struct device *dev = ctx->hw_afu->dev; - struct cxl_event event; - ulong lock_flags; - ssize_t esize; - ssize_t rc; - int bit; - DEFINE_WAIT(event_wait); - - if (*off != 0) { - dev_err(dev, "%s: Non-zero offset not supported, off=%lld\n", - __func__, *off); - rc = -EINVAL; - goto out; - } - - spin_lock_irqsave(&ctx->slock, lock_flags); - - for (;;) { - prepare_to_wait(&ctx->wq, &event_wait, TASK_INTERRUPTIBLE); - - if (ctx_event_pending(ctx) || (ctx->state == CLOSED)) - break; - - if (file->f_flags & O_NONBLOCK) { - dev_err(dev, "%s: File cannot be blocked on I/O\n", - __func__); - rc = -EAGAIN; - goto err; - } - - if (signal_pending(current)) { - dev_err(dev, "%s: Signal pending on the process\n", - __func__); - rc = -ERESTARTSYS; - goto err; - } - - spin_unlock_irqrestore(&ctx->slock, lock_flags); - schedule(); - spin_lock_irqsave(&ctx->slock, lock_flags); - } - - finish_wait(&ctx->wq, &event_wait); - - memset(&event, 0, sizeof(event)); - event.header.process_element = ctx->pe; - event.header.size = sizeof(struct cxl_event_header); - if (ctx->pending_irq) { - esize = sizeof(struct cxl_event_afu_interrupt); - event.header.size += esize; - event.header.type = CXL_EVENT_AFU_INTERRUPT; - - bit = find_first_bit(&ctx->irq_bitmap, ctx->num_irqs); - clear_bit(bit, &ctx->irq_bitmap); - event.irq.irq = bit + 1; - if (bitmap_empty(&ctx->irq_bitmap, ctx->num_irqs)) - ctx->pending_irq = false; - } else if (ctx->pending_fault) { - event.header.size += sizeof(struct cxl_event_data_storage); - event.header.type = CXL_EVENT_DATA_STORAGE; - event.fault.addr = ctx->fault_addr; - event.fault.dsisr = ctx->fault_dsisr; - ctx->pending_fault = false; - } - - spin_unlock_irqrestore(&ctx->slock, lock_flags); - - if (copy_to_user(buf, &event, event.header.size)) { - dev_err(dev, "%s: copy_to_user failed\n", __func__); - rc = -EFAULT; - goto out; - } - - rc = event.header.size; -out: - return rc; -err: - finish_wait(&ctx->wq, &event_wait); - spin_unlock_irqrestore(&ctx->slock, lock_flags); - goto out; -} - -/** - * afu_release() - release and free the context - * @inode: File inode pointer. - * @file: File associated with the context. - * - * Return: 0 on success, -errno on failure - */ -static int afu_release(struct inode *inode, struct file *file) -{ - struct ocxlflash_context *ctx = file->private_data; - int i; - - /* Unmap and free the interrupts associated with the context */ - for (i = ctx->num_irqs; i >= 0; i--) - afu_unmap_irq(0, ctx, i, ctx); - free_afu_irqs(ctx); - - return ocxlflash_release_context(ctx); -} - -/** - * ocxlflash_mmap_fault() - mmap fault handler - * @vmf: VM fault associated with current fault. - * - * Return: 0 on success, -errno on failure - */ -static vm_fault_t ocxlflash_mmap_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - struct ocxlflash_context *ctx = vma->vm_file->private_data; - struct device *dev = ctx->hw_afu->dev; - u64 mmio_area, offset; - - offset = vmf->pgoff << PAGE_SHIFT; - if (offset >= ctx->psn_size) - return VM_FAULT_SIGBUS; - - mutex_lock(&ctx->state_mutex); - if (ctx->state != STARTED) { - dev_err(dev, "%s: Context not started, state=%d\n", - __func__, ctx->state); - mutex_unlock(&ctx->state_mutex); - return VM_FAULT_SIGBUS; - } - mutex_unlock(&ctx->state_mutex); - - mmio_area = ctx->psn_phys; - mmio_area += offset; - - return vmf_insert_pfn(vma, vmf->address, mmio_area >> PAGE_SHIFT); -} - -static const struct vm_operations_struct ocxlflash_vmops = { - .fault = ocxlflash_mmap_fault, -}; - -/** - * afu_mmap() - map the fault handler operations - * @file: File associated with the context. - * @vma: VM area associated with mapping. - * - * Return: 0 on success, -errno on failure - */ -static int afu_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct ocxlflash_context *ctx = file->private_data; - - if ((vma_pages(vma) + vma->vm_pgoff) > - (ctx->psn_size >> PAGE_SHIFT)) - return -EINVAL; - - vm_flags_set(vma, VM_IO | VM_PFNMAP); - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - vma->vm_ops = &ocxlflash_vmops; - return 0; -} - -static const struct file_operations ocxl_afu_fops = { - .owner = THIS_MODULE, - .poll = afu_poll, - .read = afu_read, - .release = afu_release, - .mmap = afu_mmap, -}; - -#define PATCH_FOPS(NAME) \ - do { if (!fops->NAME) fops->NAME = ocxl_afu_fops.NAME; } while (0) - -/** - * ocxlflash_get_fd() - get file descriptor for an adapter context - * @ctx_cookie: Adapter context. - * @fops: File operations to be associated. - * @fd: File descriptor to be returned back. - * - * Return: pointer to the file on success, ERR_PTR on failure - */ -static struct file *ocxlflash_get_fd(void *ctx_cookie, - struct file_operations *fops, int *fd) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct device *dev = ctx->hw_afu->dev; - struct file *file; - int flags, fdtmp; - int rc = 0; - char *name = NULL; - - /* Only allow one fd per context */ - if (ctx->mapping) { - dev_err(dev, "%s: Context is already mapped to an fd\n", - __func__); - rc = -EEXIST; - goto err1; - } - - flags = O_RDWR | O_CLOEXEC; - - /* This code is similar to anon_inode_getfd() */ - rc = get_unused_fd_flags(flags); - if (unlikely(rc < 0)) { - dev_err(dev, "%s: get_unused_fd_flags failed rc=%d\n", - __func__, rc); - goto err1; - } - fdtmp = rc; - - /* Patch the file ops that are not defined */ - if (fops) { - PATCH_FOPS(poll); - PATCH_FOPS(read); - PATCH_FOPS(release); - PATCH_FOPS(mmap); - } else /* Use default ops */ - fops = (struct file_operations *)&ocxl_afu_fops; - - name = kasprintf(GFP_KERNEL, "ocxlflash:%d", ctx->pe); - file = ocxlflash_getfile(dev, name, fops, ctx, flags); - kfree(name); - if (IS_ERR(file)) { - rc = PTR_ERR(file); - dev_err(dev, "%s: ocxlflash_getfile failed rc=%d\n", - __func__, rc); - goto err2; - } - - ctx->mapping = file->f_mapping; - *fd = fdtmp; -out: - return file; -err2: - put_unused_fd(fdtmp); -err1: - file = ERR_PTR(rc); - goto out; -} - -/** - * ocxlflash_fops_get_context() - get the context associated with the file - * @file: File associated with the adapter context. - * - * Return: pointer to the context - */ -static void *ocxlflash_fops_get_context(struct file *file) -{ - return file->private_data; -} - -/** - * ocxlflash_afu_irq() - interrupt handler for user contexts - * @irq: Interrupt number. - * @data: Private data provided at interrupt registration, the context. - * - * Return: Always return IRQ_HANDLED. - */ -static irqreturn_t ocxlflash_afu_irq(int irq, void *data) -{ - struct ocxlflash_context *ctx = data; - struct device *dev = ctx->hw_afu->dev; - int i; - - dev_dbg(dev, "%s: Interrupt raised for pe %i virq %i\n", - __func__, ctx->pe, irq); - - for (i = 0; i < ctx->num_irqs; i++) { - if (ctx->irqs[i].virq == irq) - break; - } - if (unlikely(i >= ctx->num_irqs)) { - dev_err(dev, "%s: Received AFU IRQ out of range\n", __func__); - goto out; - } - - spin_lock(&ctx->slock); - set_bit(i - 1, &ctx->irq_bitmap); - ctx->pending_irq = true; - spin_unlock(&ctx->slock); - - wake_up_all(&ctx->wq); -out: - return IRQ_HANDLED; -} - -/** - * ocxlflash_start_work() - start a user context - * @ctx_cookie: Context to be started. - * @num_irqs: Number of interrupts requested. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_start_work(void *ctx_cookie, u64 num_irqs) -{ - struct ocxlflash_context *ctx = ctx_cookie; - struct ocxl_hw_afu *afu = ctx->hw_afu; - struct device *dev = afu->dev; - char *name; - int rc = 0; - int i; - - rc = alloc_afu_irqs(ctx, num_irqs); - if (unlikely(rc < 0)) { - dev_err(dev, "%s: alloc_afu_irqs failed rc=%d\n", __func__, rc); - goto out; - } - - for (i = 0; i < num_irqs; i++) { - name = kasprintf(GFP_KERNEL, "ocxlflash-%s-pe%i-%i", - dev_name(dev), ctx->pe, i); - rc = afu_map_irq(0, ctx, i, ocxlflash_afu_irq, ctx, name); - kfree(name); - if (unlikely(rc < 0)) { - dev_err(dev, "%s: afu_map_irq failed rc=%d\n", - __func__, rc); - goto err; - } - } - - rc = start_context(ctx); - if (unlikely(rc)) { - dev_err(dev, "%s: start_context failed rc=%d\n", __func__, rc); - goto err; - } -out: - return rc; -err: - for (i = i-1; i >= 0; i--) - afu_unmap_irq(0, ctx, i, ctx); - free_afu_irqs(ctx); - goto out; -}; - -/** - * ocxlflash_fd_mmap() - mmap handler for adapter file descriptor - * @file: File installed with adapter file descriptor. - * @vma: VM area associated with mapping. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_fd_mmap(struct file *file, struct vm_area_struct *vma) -{ - return afu_mmap(file, vma); -} - -/** - * ocxlflash_fd_release() - release the context associated with the file - * @inode: File inode pointer. - * @file: File associated with the adapter context. - * - * Return: 0 on success, -errno on failure - */ -static int ocxlflash_fd_release(struct inode *inode, struct file *file) -{ - return afu_release(inode, file); -} - -/* Backend ops to ocxlflash services */ -const struct cxlflash_backend_ops cxlflash_ocxl_ops = { - .module = THIS_MODULE, - .psa_map = ocxlflash_psa_map, - .psa_unmap = ocxlflash_psa_unmap, - .process_element = ocxlflash_process_element, - .map_afu_irq = ocxlflash_map_afu_irq, - .unmap_afu_irq = ocxlflash_unmap_afu_irq, - .get_irq_objhndl = ocxlflash_get_irq_objhndl, - .start_context = ocxlflash_start_context, - .stop_context = ocxlflash_stop_context, - .afu_reset = ocxlflash_afu_reset, - .set_master = ocxlflash_set_master, - .get_context = ocxlflash_get_context, - .dev_context_init = ocxlflash_dev_context_init, - .release_context = ocxlflash_release_context, - .perst_reloads_same_image = ocxlflash_perst_reloads_same_image, - .read_adapter_vpd = ocxlflash_read_adapter_vpd, - .allocate_afu_irqs = ocxlflash_allocate_afu_irqs, - .free_afu_irqs = ocxlflash_free_afu_irqs, - .create_afu = ocxlflash_create_afu, - .destroy_afu = ocxlflash_destroy_afu, - .get_fd = ocxlflash_get_fd, - .fops_get_context = ocxlflash_fops_get_context, - .start_work = ocxlflash_start_work, - .fd_mmap = ocxlflash_fd_mmap, - .fd_release = ocxlflash_fd_release, -}; diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h deleted file mode 100644 index f2fe88816bea..000000000000 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ /dev/null @@ -1,72 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * Uma Krishnan <ukrishn@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2018 IBM Corporation - */ - -#define OCXL_MAX_IRQS 4 /* Max interrupts per process */ - -struct ocxlflash_irqs { - int hwirq; - u32 virq; - void __iomem *vtrig; -}; - -/* OCXL hardware AFU associated with the host */ -struct ocxl_hw_afu { - struct ocxlflash_context *ocxl_ctx; /* Host context */ - struct pci_dev *pdev; /* PCI device */ - struct device *dev; /* Generic device */ - bool perst_same_image; /* Same image loaded on perst */ - - struct ocxl_fn_config fcfg; /* DVSEC config of the function */ - struct ocxl_afu_config acfg; /* AFU configuration data */ - - int fn_actag_base; /* Function acTag base */ - int fn_actag_enabled; /* Function acTag number enabled */ - int afu_actag_base; /* AFU acTag base */ - int afu_actag_enabled; /* AFU acTag number enabled */ - - phys_addr_t ppmmio_phys; /* Per process MMIO space */ - phys_addr_t gmmio_phys; /* Global AFU MMIO space */ - void __iomem *gmmio_virt; /* Global MMIO map */ - - void *link_token; /* Link token for the SPA */ - struct idr idr; /* IDR to manage contexts */ - int max_pasid; /* Maximum number of contexts */ - bool is_present; /* Function has AFUs defined */ -}; - -enum ocxlflash_ctx_state { - CLOSED, - OPENED, - STARTED -}; - -struct ocxlflash_context { - struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */ - struct address_space *mapping; /* Mapping for pseudo filesystem */ - bool master; /* Whether this is a master context */ - int pe; /* Process element */ - - phys_addr_t psn_phys; /* Process mapping */ - u64 psn_size; /* Process mapping size */ - - spinlock_t slock; /* Protects irq/fault/event updates */ - wait_queue_head_t wq; /* Wait queue for poll and interrupts */ - struct mutex state_mutex; /* Mutex to update context state */ - enum ocxlflash_ctx_state state; /* Context state */ - - struct ocxlflash_irqs *irqs; /* Pointer to array of structures */ - int num_irqs; /* Number of interrupts */ - bool pending_irq; /* Pending interrupt on the context */ - ulong irq_bitmap; /* Bits indicating pending irq num */ - - u64 fault_addr; /* Address that triggered the fault */ - u64 fault_dsisr; /* Value of dsisr register at fault */ - bool pending_fault; /* Pending translation fault */ -}; diff --git a/drivers/scsi/cxlflash/sislite.h b/drivers/scsi/cxlflash/sislite.h deleted file mode 100644 index ab315c59505b..000000000000 --- a/drivers/scsi/cxlflash/sislite.h +++ /dev/null @@ -1,560 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#ifndef _SISLITE_H -#define _SISLITE_H - -#include <linux/types.h> - -typedef u16 ctx_hndl_t; -typedef u32 res_hndl_t; - -#define SIZE_4K 4096 -#define SIZE_64K 65536 - -/* - * IOARCB: 64 bytes, min 16 byte alignment required, host native endianness - * except for SCSI CDB which remains big endian per SCSI standards. - */ -struct sisl_ioarcb { - u16 ctx_id; /* ctx_hndl_t */ - u16 req_flags; -#define SISL_REQ_FLAGS_RES_HNDL 0x8000U /* bit 0 (MSB) */ -#define SISL_REQ_FLAGS_PORT_LUN_ID 0x0000U - -#define SISL_REQ_FLAGS_SUP_UNDERRUN 0x4000U /* bit 1 */ - -#define SISL_REQ_FLAGS_TIMEOUT_SECS 0x0000U /* bits 8,9 */ -#define SISL_REQ_FLAGS_TIMEOUT_MSECS 0x0040U -#define SISL_REQ_FLAGS_TIMEOUT_USECS 0x0080U -#define SISL_REQ_FLAGS_TIMEOUT_CYCLES 0x00C0U - -#define SISL_REQ_FLAGS_TMF_CMD 0x0004u /* bit 13 */ - -#define SISL_REQ_FLAGS_AFU_CMD 0x0002U /* bit 14 */ - -#define SISL_REQ_FLAGS_HOST_WRITE 0x0001U /* bit 15 (LSB) */ -#define SISL_REQ_FLAGS_HOST_READ 0x0000U - - union { - u32 res_hndl; /* res_hndl_t */ - u32 port_sel; /* this is a selection mask: - * 0x1 -> port#0 can be selected, - * 0x2 -> port#1 can be selected. - * Can be bitwise ORed. - */ - }; - u64 lun_id; - u32 data_len; /* 4K for read/write */ - u32 ioadl_len; - union { - u64 data_ea; /* min 16 byte aligned */ - u64 ioadl_ea; - }; - u8 msi; /* LISN to send on RRQ write */ -#define SISL_MSI_CXL_PFAULT 0 /* reserved for CXL page faults */ -#define SISL_MSI_SYNC_ERROR 1 /* recommended for AFU sync error */ -#define SISL_MSI_RRQ_UPDATED 2 /* recommended for IO completion */ -#define SISL_MSI_ASYNC_ERROR 3 /* master only - for AFU async error */ - - u8 rrq; /* 0 for a single RRQ */ - u16 timeout; /* in units specified by req_flags */ - u32 rsvd1; - u8 cdb[16]; /* must be in big endian */ -#define SISL_AFU_CMD_SYNC 0xC0 /* AFU sync command */ -#define SISL_AFU_CMD_LUN_PROVISION 0xD0 /* AFU LUN provision command */ -#define SISL_AFU_CMD_DEBUG 0xE0 /* AFU debug command */ - -#define SISL_AFU_LUN_PROVISION_CREATE 0x00 /* LUN provision create type */ -#define SISL_AFU_LUN_PROVISION_DELETE 0x01 /* LUN provision delete type */ - - union { - u64 reserved; /* Reserved for IOARRIN mode */ - struct sisl_ioasa *ioasa; /* IOASA EA for SQ Mode */ - }; -} __packed; - -struct sisl_rc { - u8 flags; -#define SISL_RC_FLAGS_SENSE_VALID 0x80U -#define SISL_RC_FLAGS_FCP_RSP_CODE_VALID 0x40U -#define SISL_RC_FLAGS_OVERRUN 0x20U -#define SISL_RC_FLAGS_UNDERRUN 0x10U - - u8 afu_rc; -#define SISL_AFU_RC_RHT_INVALID 0x01U /* user error */ -#define SISL_AFU_RC_RHT_UNALIGNED 0x02U /* should never happen */ -#define SISL_AFU_RC_RHT_OUT_OF_BOUNDS 0x03u /* user error */ -#define SISL_AFU_RC_RHT_DMA_ERR 0x04u /* see afu_extra - * may retry if afu_retry is off - * possible on master exit - */ -#define SISL_AFU_RC_RHT_RW_PERM 0x05u /* no RW perms, user error */ -#define SISL_AFU_RC_LXT_UNALIGNED 0x12U /* should never happen */ -#define SISL_AFU_RC_LXT_OUT_OF_BOUNDS 0x13u /* user error */ -#define SISL_AFU_RC_LXT_DMA_ERR 0x14u /* see afu_extra - * may retry if afu_retry is off - * possible on master exit - */ -#define SISL_AFU_RC_LXT_RW_PERM 0x15u /* no RW perms, user error */ - -#define SISL_AFU_RC_NOT_XLATE_HOST 0x1au /* possible if master exited */ - - /* NO_CHANNELS means the FC ports selected by dest_port in - * IOARCB or in the LXT entry are down when the AFU tried to select - * a FC port. If the port went down on an active IO, it will set - * fc_rc to =0x54(NOLOGI) or 0x57(LINKDOWN) instead. - */ -#define SISL_AFU_RC_NO_CHANNELS 0x20U /* see afu_extra, may retry */ -#define SISL_AFU_RC_CAP_VIOLATION 0x21U /* either user error or - * afu reset/master restart - */ -#define SISL_AFU_RC_OUT_OF_DATA_BUFS 0x30U /* always retry */ -#define SISL_AFU_RC_DATA_DMA_ERR 0x31U /* see afu_extra - * may retry if afu_retry is off - */ - - u8 scsi_rc; /* SCSI status byte, retry as appropriate */ -#define SISL_SCSI_RC_CHECK 0x02U -#define SISL_SCSI_RC_BUSY 0x08u - - u8 fc_rc; /* retry */ - /* - * We should only see fc_rc=0x57 (LINKDOWN) or 0x54(NOLOGI) for - * commands that are in flight when a link goes down or is logged out. - * If the link is down or logged out before AFU selects the port, either - * it will choose the other port or we will get afu_rc=0x20 (no_channel) - * if there is no valid port to use. - * - * ABORTPEND/ABORTOK/ABORTFAIL/TGTABORT can be retried, typically these - * would happen if a frame is dropped and something times out. - * NOLOGI or LINKDOWN can be retried if the other port is up. - * RESIDERR can be retried as well. - * - * ABORTFAIL might indicate that lots of frames are getting CRC errors. - * So it maybe retried once and reset the link if it happens again. - * The link can also be reset on the CRC error threshold interrupt. - */ -#define SISL_FC_RC_ABORTPEND 0x52 /* exchange timeout or abort request */ -#define SISL_FC_RC_WRABORTPEND 0x53 /* due to write XFER_RDY invalid */ -#define SISL_FC_RC_NOLOGI 0x54 /* port not logged in, in-flight cmds */ -#define SISL_FC_RC_NOEXP 0x55 /* FC protocol error or HW bug */ -#define SISL_FC_RC_INUSE 0x56 /* tag already in use, HW bug */ -#define SISL_FC_RC_LINKDOWN 0x57 /* link down, in-flight cmds */ -#define SISL_FC_RC_ABORTOK 0x58 /* pending abort completed w/success */ -#define SISL_FC_RC_ABORTFAIL 0x59 /* pending abort completed w/fail */ -#define SISL_FC_RC_RESID 0x5A /* ioasa underrun/overrun flags set */ -#define SISL_FC_RC_RESIDERR 0x5B /* actual data len does not match SCSI - * reported len, possibly due to dropped - * frames - */ -#define SISL_FC_RC_TGTABORT 0x5C /* command aborted by target */ -}; - -#define SISL_SENSE_DATA_LEN 20 /* Sense data length */ -#define SISL_WWID_DATA_LEN 16 /* WWID data length */ - -/* - * IOASA: 64 bytes & must follow IOARCB, min 16 byte alignment required, - * host native endianness - */ -struct sisl_ioasa { - union { - struct sisl_rc rc; - u32 ioasc; -#define SISL_IOASC_GOOD_COMPLETION 0x00000000U - }; - - union { - u32 resid; - u32 lunid_hi; - }; - - u8 port; - u8 afu_extra; - /* when afu_rc=0x04, 0x14, 0x31 (_xxx_DMA_ERR): - * afu_exta contains PSL response code. Useful codes are: - */ -#define SISL_AFU_DMA_ERR_PAGE_IN 0x0A /* AFU_retry_on_pagein Action - * Enabled N/A - * Disabled retry - */ -#define SISL_AFU_DMA_ERR_INVALID_EA 0x0B /* this is a hard error - * afu_rc Implies - * 0x04, 0x14 master exit. - * 0x31 user error. - */ - /* when afu rc=0x20 (no channels): - * afu_extra bits [4:5]: available portmask, [6:7]: requested portmask. - */ -#define SISL_AFU_NO_CLANNELS_AMASK(afu_extra) (((afu_extra) & 0x0C) >> 2) -#define SISL_AFU_NO_CLANNELS_RMASK(afu_extra) ((afu_extra) & 0x03) - - u8 scsi_extra; - u8 fc_extra; - - union { - u8 sense_data[SISL_SENSE_DATA_LEN]; - struct { - u32 lunid_lo; - u8 wwid[SISL_WWID_DATA_LEN]; - }; - }; - - /* These fields are defined by the SISlite architecture for the - * host to use as they see fit for their implementation. - */ - union { - u64 host_use[4]; - u8 host_use_b[32]; - }; -} __packed; - -#define SISL_RESP_HANDLE_T_BIT 0x1ULL /* Toggle bit */ - -/* MMIO space is required to support only 64-bit access */ - -/* - * This AFU has two mechanisms to deal with endian-ness. - * One is a global configuration (in the afu_config) register - * below that specifies the endian-ness of the host. - * The other is a per context (i.e. application) specification - * controlled by the endian_ctrl field here. Since the master - * context is one such application the master context's - * endian-ness is set to be the same as the host. - * - * As per the SISlite spec, the MMIO registers are always - * big endian. - */ -#define SISL_ENDIAN_CTRL_BE 0x8000000000000080ULL -#define SISL_ENDIAN_CTRL_LE 0x0000000000000000ULL - -#ifdef __BIG_ENDIAN -#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_BE -#else -#define SISL_ENDIAN_CTRL SISL_ENDIAN_CTRL_LE -#endif - -/* per context host transport MMIO */ -struct sisl_host_map { - __be64 endian_ctrl; /* Per context Endian Control. The AFU will - * operate on whatever the context is of the - * host application. - */ - - __be64 intr_status; /* this sends LISN# programmed in ctx_ctrl. - * Only recovery in a PERM_ERR is a context - * exit since there is no way to tell which - * command caused the error. - */ -#define SISL_ISTATUS_PERM_ERR_LISN_3_EA 0x0400ULL /* b53, user error */ -#define SISL_ISTATUS_PERM_ERR_LISN_2_EA 0x0200ULL /* b54, user error */ -#define SISL_ISTATUS_PERM_ERR_LISN_1_EA 0x0100ULL /* b55, user error */ -#define SISL_ISTATUS_PERM_ERR_LISN_3_PASID 0x0080ULL /* b56, user error */ -#define SISL_ISTATUS_PERM_ERR_LISN_2_PASID 0x0040ULL /* b57, user error */ -#define SISL_ISTATUS_PERM_ERR_LISN_1_PASID 0x0020ULL /* b58, user error */ -#define SISL_ISTATUS_PERM_ERR_CMDROOM 0x0010ULL /* b59, user error */ -#define SISL_ISTATUS_PERM_ERR_RCB_READ 0x0008ULL /* b60, user error */ -#define SISL_ISTATUS_PERM_ERR_SA_WRITE 0x0004ULL /* b61, user error */ -#define SISL_ISTATUS_PERM_ERR_RRQ_WRITE 0x0002ULL /* b62, user error */ - /* Page in wait accessing RCB/IOASA/RRQ is reported in b63. - * Same error in data/LXT/RHT access is reported via IOASA. - */ -#define SISL_ISTATUS_TEMP_ERR_PAGEIN 0x0001ULL /* b63, can only be - * generated when AFU - * auto retry is - * disabled. If user - * can determine the - * command that caused - * the error, it can - * be retried. - */ -#define SISL_ISTATUS_UNMASK (0x07FFULL) /* 1 means unmasked */ -#define SISL_ISTATUS_MASK ~(SISL_ISTATUS_UNMASK) /* 1 means masked */ - - __be64 intr_clear; - __be64 intr_mask; - __be64 ioarrin; /* only write what cmd_room permits */ - __be64 rrq_start; /* start & end are both inclusive */ - __be64 rrq_end; /* write sequence: start followed by end */ - __be64 cmd_room; - __be64 ctx_ctrl; /* least significant byte or b56:63 is LISN# */ -#define SISL_CTX_CTRL_UNMAP_SECTOR 0x8000000000000000ULL /* b0 */ -#define SISL_CTX_CTRL_LISN_MASK (0xFFULL) - __be64 mbox_w; /* restricted use */ - __be64 sq_start; /* Submission Queue (R/W): write sequence and */ - __be64 sq_end; /* inclusion semantics are the same as RRQ */ - __be64 sq_head; /* Submission Queue Head (R): for debugging */ - __be64 sq_tail; /* Submission Queue TAIL (R/W): next IOARCB */ - __be64 sq_ctx_reset; /* Submission Queue Context Reset (R/W) */ -}; - -/* per context provisioning & control MMIO */ -struct sisl_ctrl_map { - __be64 rht_start; - __be64 rht_cnt_id; - /* both cnt & ctx_id args must be ULL */ -#define SISL_RHT_CNT_ID(cnt, ctx_id) (((cnt) << 48) | ((ctx_id) << 32)) - - __be64 ctx_cap; /* afu_rc below is when the capability is violated */ -#define SISL_CTX_CAP_PROXY_ISSUE 0x8000000000000000ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_REAL_MODE 0x4000000000000000ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_HOST_XLATE 0x2000000000000000ULL /* afu_rc 0x1a */ -#define SISL_CTX_CAP_PROXY_TARGET 0x1000000000000000ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_AFU_CMD 0x0000000000000008ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_GSCSI_CMD 0x0000000000000004ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_WRITE_CMD 0x0000000000000002ULL /* afu_rc 0x21 */ -#define SISL_CTX_CAP_READ_CMD 0x0000000000000001ULL /* afu_rc 0x21 */ - __be64 mbox_r; - __be64 lisn_pasid[2]; - /* pasid _a arg must be ULL */ -#define SISL_LISN_PASID(_a, _b) (((_a) << 32) | (_b)) - __be64 lisn_ea[3]; -}; - -/* single copy global regs */ -struct sisl_global_regs { - __be64 aintr_status; - /* - * In cxlflash, FC port/link are arranged in port pairs, each - * gets a byte of status: - * - * *_OTHER: other err, FC_ERRCAP[31:20] - * *_LOGO: target sent FLOGI/PLOGI/LOGO while logged in - * *_CRC_T: CRC threshold exceeded - * *_LOGI_R: login state machine timed out and retrying - * *_LOGI_F: login failed, FC_ERROR[19:0] - * *_LOGI_S: login succeeded - * *_LINK_DN: link online to offline - * *_LINK_UP: link offline to online - */ -#define SISL_ASTATUS_FC2_OTHER 0x80000000ULL /* b32 */ -#define SISL_ASTATUS_FC2_LOGO 0x40000000ULL /* b33 */ -#define SISL_ASTATUS_FC2_CRC_T 0x20000000ULL /* b34 */ -#define SISL_ASTATUS_FC2_LOGI_R 0x10000000ULL /* b35 */ -#define SISL_ASTATUS_FC2_LOGI_F 0x08000000ULL /* b36 */ -#define SISL_ASTATUS_FC2_LOGI_S 0x04000000ULL /* b37 */ -#define SISL_ASTATUS_FC2_LINK_DN 0x02000000ULL /* b38 */ -#define SISL_ASTATUS_FC2_LINK_UP 0x01000000ULL /* b39 */ - -#define SISL_ASTATUS_FC3_OTHER 0x00800000ULL /* b40 */ -#define SISL_ASTATUS_FC3_LOGO 0x00400000ULL /* b41 */ -#define SISL_ASTATUS_FC3_CRC_T 0x00200000ULL /* b42 */ -#define SISL_ASTATUS_FC3_LOGI_R 0x00100000ULL /* b43 */ -#define SISL_ASTATUS_FC3_LOGI_F 0x00080000ULL /* b44 */ -#define SISL_ASTATUS_FC3_LOGI_S 0x00040000ULL /* b45 */ -#define SISL_ASTATUS_FC3_LINK_DN 0x00020000ULL /* b46 */ -#define SISL_ASTATUS_FC3_LINK_UP 0x00010000ULL /* b47 */ - -#define SISL_ASTATUS_FC0_OTHER 0x00008000ULL /* b48 */ -#define SISL_ASTATUS_FC0_LOGO 0x00004000ULL /* b49 */ -#define SISL_ASTATUS_FC0_CRC_T 0x00002000ULL /* b50 */ -#define SISL_ASTATUS_FC0_LOGI_R 0x00001000ULL /* b51 */ -#define SISL_ASTATUS_FC0_LOGI_F 0x00000800ULL /* b52 */ -#define SISL_ASTATUS_FC0_LOGI_S 0x00000400ULL /* b53 */ -#define SISL_ASTATUS_FC0_LINK_DN 0x00000200ULL /* b54 */ -#define SISL_ASTATUS_FC0_LINK_UP 0x00000100ULL /* b55 */ - -#define SISL_ASTATUS_FC1_OTHER 0x00000080ULL /* b56 */ -#define SISL_ASTATUS_FC1_LOGO 0x00000040ULL /* b57 */ -#define SISL_ASTATUS_FC1_CRC_T 0x00000020ULL /* b58 */ -#define SISL_ASTATUS_FC1_LOGI_R 0x00000010ULL /* b59 */ -#define SISL_ASTATUS_FC1_LOGI_F 0x00000008ULL /* b60 */ -#define SISL_ASTATUS_FC1_LOGI_S 0x00000004ULL /* b61 */ -#define SISL_ASTATUS_FC1_LINK_DN 0x00000002ULL /* b62 */ -#define SISL_ASTATUS_FC1_LINK_UP 0x00000001ULL /* b63 */ - -#define SISL_FC_INTERNAL_UNMASK 0x0000000300000000ULL /* 1 means unmasked */ -#define SISL_FC_INTERNAL_MASK ~(SISL_FC_INTERNAL_UNMASK) -#define SISL_FC_INTERNAL_SHIFT 32 - -#define SISL_FC_SHUTDOWN_NORMAL 0x0000000000000010ULL -#define SISL_FC_SHUTDOWN_ABRUPT 0x0000000000000020ULL - -#define SISL_STATUS_SHUTDOWN_ACTIVE 0x0000000000000010ULL -#define SISL_STATUS_SHUTDOWN_COMPLETE 0x0000000000000020ULL - -#define SISL_ASTATUS_UNMASK 0xFFFFFFFFULL /* 1 means unmasked */ -#define SISL_ASTATUS_MASK ~(SISL_ASTATUS_UNMASK) /* 1 means masked */ - - __be64 aintr_clear; - __be64 aintr_mask; - __be64 afu_ctrl; - __be64 afu_hb; - __be64 afu_scratch_pad; - __be64 afu_port_sel; -#define SISL_AFUCONF_AR_IOARCB 0x4000ULL -#define SISL_AFUCONF_AR_LXT 0x2000ULL -#define SISL_AFUCONF_AR_RHT 0x1000ULL -#define SISL_AFUCONF_AR_DATA 0x0800ULL -#define SISL_AFUCONF_AR_RSRC 0x0400ULL -#define SISL_AFUCONF_AR_IOASA 0x0200ULL -#define SISL_AFUCONF_AR_RRQ 0x0100ULL -/* Aggregate all Auto Retry Bits */ -#define SISL_AFUCONF_AR_ALL (SISL_AFUCONF_AR_IOARCB|SISL_AFUCONF_AR_LXT| \ - SISL_AFUCONF_AR_RHT|SISL_AFUCONF_AR_DATA| \ - SISL_AFUCONF_AR_RSRC|SISL_AFUCONF_AR_IOASA| \ - SISL_AFUCONF_AR_RRQ) -#ifdef __BIG_ENDIAN -#define SISL_AFUCONF_ENDIAN 0x0000ULL -#else -#define SISL_AFUCONF_ENDIAN 0x0020ULL -#endif -#define SISL_AFUCONF_MBOX_CLR_READ 0x0010ULL - __be64 afu_config; - __be64 rsvd[0xf8]; - __le64 afu_version; - __be64 interface_version; -#define SISL_INTVER_CAP_SHIFT 16 -#define SISL_INTVER_MAJ_SHIFT 8 -#define SISL_INTVER_CAP_MASK 0xFFFFFFFF00000000ULL -#define SISL_INTVER_MAJ_MASK 0x00000000FFFF0000ULL -#define SISL_INTVER_MIN_MASK 0x000000000000FFFFULL -#define SISL_INTVER_CAP_IOARRIN_CMD_MODE 0x800000000000ULL -#define SISL_INTVER_CAP_SQ_CMD_MODE 0x400000000000ULL -#define SISL_INTVER_CAP_RESERVED_CMD_MODE_A 0x200000000000ULL -#define SISL_INTVER_CAP_RESERVED_CMD_MODE_B 0x100000000000ULL -#define SISL_INTVER_CAP_LUN_PROVISION 0x080000000000ULL -#define SISL_INTVER_CAP_AFU_DEBUG 0x040000000000ULL -#define SISL_INTVER_CAP_OCXL_LISN 0x020000000000ULL -}; - -#define CXLFLASH_NUM_FC_PORTS_PER_BANK 2 /* fixed # of ports per bank */ -#define CXLFLASH_MAX_FC_BANKS 2 /* max # of banks supported */ -#define CXLFLASH_MAX_FC_PORTS (CXLFLASH_NUM_FC_PORTS_PER_BANK * \ - CXLFLASH_MAX_FC_BANKS) -#define CXLFLASH_MAX_CONTEXT 512 /* number of contexts per AFU */ -#define CXLFLASH_NUM_VLUNS 512 /* number of vluns per AFU/port */ -#define CXLFLASH_NUM_REGS 512 /* number of registers per port */ - -struct fc_port_bank { - __be64 fc_port_regs[CXLFLASH_NUM_FC_PORTS_PER_BANK][CXLFLASH_NUM_REGS]; - __be64 fc_port_luns[CXLFLASH_NUM_FC_PORTS_PER_BANK][CXLFLASH_NUM_VLUNS]; -}; - -struct sisl_global_map { - union { - struct sisl_global_regs regs; - char page0[SIZE_4K]; /* page 0 */ - }; - - char page1[SIZE_4K]; /* page 1 */ - - struct fc_port_bank bank[CXLFLASH_MAX_FC_BANKS]; /* pages 2 - 9 */ - - /* pages 10 - 15 are reserved */ - -}; - -/* - * CXL Flash Memory Map - * - * +-------------------------------+ - * | 512 * 64 KB User MMIO | - * | (per context) | - * | User Accessible | - * +-------------------------------+ - * | 512 * 128 B per context | - * | Provisioning and Control | - * | Trusted Process accessible | - * +-------------------------------+ - * | 64 KB Global | - * | Trusted Process accessible | - * +-------------------------------+ - */ -struct cxlflash_afu_map { - union { - struct sisl_host_map host; - char harea[SIZE_64K]; /* 64KB each */ - } hosts[CXLFLASH_MAX_CONTEXT]; - - union { - struct sisl_ctrl_map ctrl; - char carea[cache_line_size()]; /* 128B each */ - } ctrls[CXLFLASH_MAX_CONTEXT]; - - union { - struct sisl_global_map global; - char garea[SIZE_64K]; /* 64KB single block */ - }; -}; - -/* - * LXT - LBA Translation Table - * LXT control blocks - */ -struct sisl_lxt_entry { - u64 rlba_base; /* bits 0:47 is base - * b48:55 is lun index - * b58:59 is write & read perms - * (if no perm, afu_rc=0x15) - * b60:63 is port_sel mask - */ -}; - -/* - * RHT - Resource Handle Table - * Per the SISlite spec, RHT entries are to be 16-byte aligned - */ -struct sisl_rht_entry { - struct sisl_lxt_entry *lxt_start; - u32 lxt_cnt; - u16 rsvd; - u8 fp; /* format & perm nibbles. - * (if no perm, afu_rc=0x05) - */ - u8 nmask; -} __packed __aligned(16); - -struct sisl_rht_entry_f1 { - u64 lun_id; - union { - struct { - u8 valid; - u8 rsvd[5]; - u8 fp; - u8 port_sel; - }; - - u64 dw; - }; -} __packed __aligned(16); - -/* make the fp byte */ -#define SISL_RHT_FP(fmt, perm) (((fmt) << 4) | (perm)) - -/* make the fp byte for a clone from a source fp and clone flags - * flags must be only 2 LSB bits. - */ -#define SISL_RHT_FP_CLONE(src_fp, cln_flags) ((src_fp) & (0xFC | (cln_flags))) - -#define RHT_PERM_READ 0x01U -#define RHT_PERM_WRITE 0x02U -#define RHT_PERM_RW (RHT_PERM_READ | RHT_PERM_WRITE) - -/* extract the perm bits from a fp */ -#define SISL_RHT_PERM(fp) ((fp) & RHT_PERM_RW) - -#define PORT0 0x01U -#define PORT1 0x02U -#define PORT2 0x04U -#define PORT3 0x08U -#define PORT_MASK(_n) ((1 << (_n)) - 1) - -/* AFU Sync Mode byte */ -#define AFU_LW_SYNC 0x0U -#define AFU_HW_SYNC 0x1U -#define AFU_GSYNC 0x2U - -/* Special Task Management Function CDB */ -#define TMF_LUN_RESET 0x1U -#define TMF_CLEAR_ACA 0x2U - -#endif /* _SISLITE_H */ diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c deleted file mode 100644 index e1b55b03e812..000000000000 --- a/drivers/scsi/cxlflash/superpipe.c +++ /dev/null @@ -1,2220 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#include <linux/delay.h> -#include <linux/file.h> -#include <linux/interrupt.h> -#include <linux/pci.h> -#include <linux/syscalls.h> -#include <asm/unaligned.h> - -#include <scsi/scsi.h> -#include <scsi/scsi_host.h> -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_eh.h> -#include <uapi/scsi/cxlflash_ioctl.h> - -#include "sislite.h" -#include "common.h" -#include "vlun.h" -#include "superpipe.h" - -struct cxlflash_global global; - -/** - * marshal_rele_to_resize() - translate release to resize structure - * @release: Source structure from which to translate/copy. - * @resize: Destination structure for the translate/copy. - */ -static void marshal_rele_to_resize(struct dk_cxlflash_release *release, - struct dk_cxlflash_resize *resize) -{ - resize->hdr = release->hdr; - resize->context_id = release->context_id; - resize->rsrc_handle = release->rsrc_handle; -} - -/** - * marshal_det_to_rele() - translate detach to release structure - * @detach: Destination structure for the translate/copy. - * @release: Source structure from which to translate/copy. - */ -static void marshal_det_to_rele(struct dk_cxlflash_detach *detach, - struct dk_cxlflash_release *release) -{ - release->hdr = detach->hdr; - release->context_id = detach->context_id; -} - -/** - * marshal_udir_to_rele() - translate udirect to release structure - * @udirect: Source structure from which to translate/copy. - * @release: Destination structure for the translate/copy. - */ -static void marshal_udir_to_rele(struct dk_cxlflash_udirect *udirect, - struct dk_cxlflash_release *release) -{ - release->hdr = udirect->hdr; - release->context_id = udirect->context_id; - release->rsrc_handle = udirect->rsrc_handle; -} - -/** - * cxlflash_free_errpage() - frees resources associated with global error page - */ -void cxlflash_free_errpage(void) -{ - - mutex_lock(&global.mutex); - if (global.err_page) { - __free_page(global.err_page); - global.err_page = NULL; - } - mutex_unlock(&global.mutex); -} - -/** - * cxlflash_stop_term_user_contexts() - stops/terminates known user contexts - * @cfg: Internal structure associated with the host. - * - * When the host needs to go down, all users must be quiesced and their - * memory freed. This is accomplished by putting the contexts in error - * state which will notify the user and let them 'drive' the tear down. - * Meanwhile, this routine camps until all user contexts have been removed. - * - * Note that the main loop in this routine will always execute at least once - * to flush the reset_waitq. - */ -void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - int i, found = true; - - cxlflash_mark_contexts_error(cfg); - - while (true) { - for (i = 0; i < MAX_CONTEXT; i++) - if (cfg->ctx_tbl[i]) { - found = true; - break; - } - - if (!found && list_empty(&cfg->ctx_err_recovery)) - return; - - dev_dbg(dev, "%s: Wait for user contexts to quiesce...\n", - __func__); - wake_up_all(&cfg->reset_waitq); - ssleep(1); - found = false; - } -} - -/** - * find_error_context() - locates a context by cookie on the error recovery list - * @cfg: Internal structure associated with the host. - * @rctxid: Desired context by id. - * @file: Desired context by file. - * - * Return: Found context on success, NULL on failure - */ -static struct ctx_info *find_error_context(struct cxlflash_cfg *cfg, u64 rctxid, - struct file *file) -{ - struct ctx_info *ctxi; - - list_for_each_entry(ctxi, &cfg->ctx_err_recovery, list) - if ((ctxi->ctxid == rctxid) || (ctxi->file == file)) - return ctxi; - - return NULL; -} - -/** - * get_context() - obtains a validated and locked context reference - * @cfg: Internal structure associated with the host. - * @rctxid: Desired context (raw, un-decoded format). - * @arg: LUN information or file associated with request. - * @ctx_ctrl: Control information to 'steer' desired lookup. - * - * NOTE: despite the name pid, in linux, current->pid actually refers - * to the lightweight process id (tid) and can change if the process is - * multi threaded. The tgid remains constant for the process and only changes - * when the process of fork. For all intents and purposes, think of tgid - * as a pid in the traditional sense. - * - * Return: Validated context on success, NULL on failure - */ -struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxid, - void *arg, enum ctx_ctrl ctx_ctrl) -{ - struct device *dev = &cfg->dev->dev; - struct ctx_info *ctxi = NULL; - struct lun_access *lun_access = NULL; - struct file *file = NULL; - struct llun_info *lli = arg; - u64 ctxid = DECODE_CTXID(rctxid); - int rc; - pid_t pid = task_tgid_nr(current), ctxpid = 0; - - if (ctx_ctrl & CTX_CTRL_FILE) { - lli = NULL; - file = (struct file *)arg; - } - - if (ctx_ctrl & CTX_CTRL_CLONE) - pid = task_ppid_nr(current); - - if (likely(ctxid < MAX_CONTEXT)) { - while (true) { - mutex_lock(&cfg->ctx_tbl_list_mutex); - ctxi = cfg->ctx_tbl[ctxid]; - if (ctxi) - if ((file && (ctxi->file != file)) || - (!file && (ctxi->ctxid != rctxid))) - ctxi = NULL; - - if ((ctx_ctrl & CTX_CTRL_ERR) || - (!ctxi && (ctx_ctrl & CTX_CTRL_ERR_FALLBACK))) - ctxi = find_error_context(cfg, rctxid, file); - if (!ctxi) { - mutex_unlock(&cfg->ctx_tbl_list_mutex); - goto out; - } - - /* - * Need to acquire ownership of the context while still - * under the table/list lock to serialize with a remove - * thread. Use the 'try' to avoid stalling the - * table/list lock for a single context. - * - * Note that the lock order is: - * - * cfg->ctx_tbl_list_mutex -> ctxi->mutex - * - * Therefore release ctx_tbl_list_mutex before retrying. - */ - rc = mutex_trylock(&ctxi->mutex); - mutex_unlock(&cfg->ctx_tbl_list_mutex); - if (rc) - break; /* got the context's lock! */ - } - - if (ctxi->unavail) - goto denied; - - ctxpid = ctxi->pid; - if (likely(!(ctx_ctrl & CTX_CTRL_NOPID))) - if (pid != ctxpid) - goto denied; - - if (lli) { - list_for_each_entry(lun_access, &ctxi->luns, list) - if (lun_access->lli == lli) - goto out; - goto denied; - } - } - -out: - dev_dbg(dev, "%s: rctxid=%016llx ctxinfo=%p ctxpid=%u pid=%u " - "ctx_ctrl=%u\n", __func__, rctxid, ctxi, ctxpid, pid, - ctx_ctrl); - - return ctxi; - -denied: - mutex_unlock(&ctxi->mutex); - ctxi = NULL; - goto out; -} - -/** - * put_context() - release a context that was retrieved from get_context() - * @ctxi: Context to release. - * - * For now, releasing the context equates to unlocking it's mutex. - */ -void put_context(struct ctx_info *ctxi) -{ - mutex_unlock(&ctxi->mutex); -} - -/** - * afu_attach() - attach a context to the AFU - * @cfg: Internal structure associated with the host. - * @ctxi: Context to attach. - * - * Upon setting the context capabilities, they must be confirmed with - * a read back operation as the context might have been closed since - * the mailbox was unlocked. When this occurs, registration is failed. - * - * Return: 0 on success, -errno on failure - */ -static int afu_attach(struct cxlflash_cfg *cfg, struct ctx_info *ctxi) -{ - struct device *dev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct sisl_ctrl_map __iomem *ctrl_map = ctxi->ctrl_map; - int rc = 0; - struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); - u64 val; - int i; - - /* Unlock cap and restrict user to read/write cmds in translated mode */ - readq_be(&ctrl_map->mbox_r); - val = (SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD); - writeq_be(val, &ctrl_map->ctx_cap); - val = readq_be(&ctrl_map->ctx_cap); - if (val != (SISL_CTX_CAP_READ_CMD | SISL_CTX_CAP_WRITE_CMD)) { - dev_err(dev, "%s: ctx may be closed val=%016llx\n", - __func__, val); - rc = -EAGAIN; - goto out; - } - - if (afu_is_ocxl_lisn(afu)) { - /* Set up the LISN effective address for each interrupt */ - for (i = 0; i < ctxi->irqs; i++) { - val = cfg->ops->get_irq_objhndl(ctxi->ctx, i); - writeq_be(val, &ctrl_map->lisn_ea[i]); - } - - /* Use primary HWQ PASID as identifier for all interrupts */ - val = hwq->ctx_hndl; - writeq_be(SISL_LISN_PASID(val, val), &ctrl_map->lisn_pasid[0]); - writeq_be(SISL_LISN_PASID(0UL, val), &ctrl_map->lisn_pasid[1]); - } - - /* Set up MMIO registers pointing to the RHT */ - writeq_be((u64)ctxi->rht_start, &ctrl_map->rht_start); - val = SISL_RHT_CNT_ID((u64)MAX_RHT_PER_CONTEXT, (u64)(hwq->ctx_hndl)); - writeq_be(val, &ctrl_map->rht_cnt_id); -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * read_cap16() - issues a SCSI READ_CAP16 command - * @sdev: SCSI device associated with LUN. - * @lli: LUN destined for capacity request. - * - * The READ_CAP16 can take quite a while to complete. Should an EEH occur while - * in scsi_execute_cmd(), the EEH handler will attempt to recover. As part of - * the recovery, the handler drains all currently running ioctls, waiting until - * they have completed before proceeding with a reset. As this routine is used - * on the ioctl path, this can create a condition where the EEH handler becomes - * stuck, infinitely waiting for this ioctl thread. To avoid this behavior, - * temporarily unmark this thread as an ioctl thread by releasing the ioctl - * read semaphore. This will allow the EEH handler to proceed with a recovery - * while this thread is still running. Once the scsi_execute_cmd() returns, - * reacquire the ioctl read semaphore and check the adapter state in case it - * changed while inside of scsi_execute_cmd(). The state check will wait if the - * adapter is still being recovered or return a failure if the recovery failed. - * In the event that the adapter reset failed, simply return the failure as the - * ioctl would be unable to continue. - * - * Note that the above puts a requirement on this routine to only be called on - * an ioctl thread. - * - * Return: 0 on success, -errno on failure - */ -static int read_cap16(struct scsi_device *sdev, struct llun_info *lli) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct glun_info *gli = lli->parent; - struct scsi_sense_hdr sshdr; - const struct scsi_exec_args exec_args = { - .sshdr = &sshdr, - }; - u8 *cmd_buf = NULL; - u8 *scsi_cmd = NULL; - int rc = 0; - int result = 0; - int retry_cnt = 0; - u32 to = CMD_TIMEOUT * HZ; - -retry: - cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL); - scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL); - if (unlikely(!cmd_buf || !scsi_cmd)) { - rc = -ENOMEM; - goto out; - } - - scsi_cmd[0] = SERVICE_ACTION_IN_16; /* read cap(16) */ - scsi_cmd[1] = SAI_READ_CAPACITY_16; /* service action */ - put_unaligned_be32(CMD_BUFSIZE, &scsi_cmd[10]); - - dev_dbg(dev, "%s: %ssending cmd(%02x)\n", __func__, - retry_cnt ? "re" : "", scsi_cmd[0]); - - /* Drop the ioctl read semaphore across lengthy call */ - up_read(&cfg->ioctl_rwsem); - result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_IN, cmd_buf, - CMD_BUFSIZE, to, CMD_RETRIES, &exec_args); - down_read(&cfg->ioctl_rwsem); - rc = check_state(cfg); - if (rc) { - dev_err(dev, "%s: Failed state result=%08x\n", - __func__, result); - rc = -ENODEV; - goto out; - } - - if (result > 0 && scsi_sense_valid(&sshdr)) { - if (result & SAM_STAT_CHECK_CONDITION) { - switch (sshdr.sense_key) { - case NO_SENSE: - case RECOVERED_ERROR: - case NOT_READY: - result &= ~SAM_STAT_CHECK_CONDITION; - break; - case UNIT_ATTENTION: - switch (sshdr.asc) { - case 0x29: /* Power on Reset or Device Reset */ - fallthrough; - case 0x2A: /* Device capacity changed */ - case 0x3F: /* Report LUNs changed */ - /* Retry the command once more */ - if (retry_cnt++ < 1) { - kfree(cmd_buf); - kfree(scsi_cmd); - goto retry; - } - } - break; - default: - break; - } - } - } - - if (result) { - dev_err(dev, "%s: command failed, result=%08x\n", - __func__, result); - rc = -EIO; - goto out; - } - - /* - * Read cap was successful, grab values from the buffer; - * note that we don't need to worry about unaligned access - * as the buffer is allocated on an aligned boundary. - */ - mutex_lock(&gli->mutex); - gli->max_lba = be64_to_cpu(*((__be64 *)&cmd_buf[0])); - gli->blk_len = be32_to_cpu(*((__be32 *)&cmd_buf[8])); - mutex_unlock(&gli->mutex); - -out: - kfree(cmd_buf); - kfree(scsi_cmd); - - dev_dbg(dev, "%s: maxlba=%lld blklen=%d rc=%d\n", - __func__, gli->max_lba, gli->blk_len, rc); - return rc; -} - -/** - * get_rhte() - obtains validated resource handle table entry reference - * @ctxi: Context owning the resource handle. - * @rhndl: Resource handle associated with entry. - * @lli: LUN associated with request. - * - * Return: Validated RHTE on success, NULL on failure - */ -struct sisl_rht_entry *get_rhte(struct ctx_info *ctxi, res_hndl_t rhndl, - struct llun_info *lli) -{ - struct cxlflash_cfg *cfg = ctxi->cfg; - struct device *dev = &cfg->dev->dev; - struct sisl_rht_entry *rhte = NULL; - - if (unlikely(!ctxi->rht_start)) { - dev_dbg(dev, "%s: Context does not have allocated RHT\n", - __func__); - goto out; - } - - if (unlikely(rhndl >= MAX_RHT_PER_CONTEXT)) { - dev_dbg(dev, "%s: Bad resource handle rhndl=%d\n", - __func__, rhndl); - goto out; - } - - if (unlikely(ctxi->rht_lun[rhndl] != lli)) { - dev_dbg(dev, "%s: Bad resource handle LUN rhndl=%d\n", - __func__, rhndl); - goto out; - } - - rhte = &ctxi->rht_start[rhndl]; - if (unlikely(rhte->nmask == 0)) { - dev_dbg(dev, "%s: Unopened resource handle rhndl=%d\n", - __func__, rhndl); - rhte = NULL; - goto out; - } - -out: - return rhte; -} - -/** - * rhte_checkout() - obtains free/empty resource handle table entry - * @ctxi: Context owning the resource handle. - * @lli: LUN associated with request. - * - * Return: Free RHTE on success, NULL on failure - */ -struct sisl_rht_entry *rhte_checkout(struct ctx_info *ctxi, - struct llun_info *lli) -{ - struct cxlflash_cfg *cfg = ctxi->cfg; - struct device *dev = &cfg->dev->dev; - struct sisl_rht_entry *rhte = NULL; - int i; - - /* Find a free RHT entry */ - for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) - if (ctxi->rht_start[i].nmask == 0) { - rhte = &ctxi->rht_start[i]; - ctxi->rht_out++; - break; - } - - if (likely(rhte)) - ctxi->rht_lun[i] = lli; - - dev_dbg(dev, "%s: returning rhte=%p index=%d\n", __func__, rhte, i); - return rhte; -} - -/** - * rhte_checkin() - releases a resource handle table entry - * @ctxi: Context owning the resource handle. - * @rhte: RHTE to release. - */ -void rhte_checkin(struct ctx_info *ctxi, - struct sisl_rht_entry *rhte) -{ - u32 rsrc_handle = rhte - ctxi->rht_start; - - rhte->nmask = 0; - rhte->fp = 0; - ctxi->rht_out--; - ctxi->rht_lun[rsrc_handle] = NULL; - ctxi->rht_needs_ws[rsrc_handle] = false; -} - -/** - * rht_format1() - populates a RHTE for format 1 - * @rhte: RHTE to populate. - * @lun_id: LUN ID of LUN associated with RHTE. - * @perm: Desired permissions for RHTE. - * @port_sel: Port selection mask - */ -static void rht_format1(struct sisl_rht_entry *rhte, u64 lun_id, u32 perm, - u32 port_sel) -{ - /* - * Populate the Format 1 RHT entry for direct access (physical - * LUN) using the synchronization sequence defined in the - * SISLite specification. - */ - struct sisl_rht_entry_f1 dummy = { 0 }; - struct sisl_rht_entry_f1 *rhte_f1 = (struct sisl_rht_entry_f1 *)rhte; - - memset(rhte_f1, 0, sizeof(*rhte_f1)); - rhte_f1->fp = SISL_RHT_FP(1U, 0); - dma_wmb(); /* Make setting of format bit visible */ - - rhte_f1->lun_id = lun_id; - dma_wmb(); /* Make setting of LUN id visible */ - - /* - * Use a dummy RHT Format 1 entry to build the second dword - * of the entry that must be populated in a single write when - * enabled (valid bit set to TRUE). - */ - dummy.valid = 0x80; - dummy.fp = SISL_RHT_FP(1U, perm); - dummy.port_sel = port_sel; - rhte_f1->dw = dummy.dw; - - dma_wmb(); /* Make remaining RHT entry fields visible */ -} - -/** - * cxlflash_lun_attach() - attaches a user to a LUN and manages the LUN's mode - * @gli: LUN to attach. - * @mode: Desired mode of the LUN. - * @locked: Mutex status on current thread. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_lun_attach(struct glun_info *gli, enum lun_mode mode, bool locked) -{ - int rc = 0; - - if (!locked) - mutex_lock(&gli->mutex); - - if (gli->mode == MODE_NONE) - gli->mode = mode; - else if (gli->mode != mode) { - pr_debug("%s: gli_mode=%d requested_mode=%d\n", - __func__, gli->mode, mode); - rc = -EINVAL; - goto out; - } - - gli->users++; - WARN_ON(gli->users <= 0); -out: - pr_debug("%s: Returning rc=%d gli->mode=%u gli->users=%u\n", - __func__, rc, gli->mode, gli->users); - if (!locked) - mutex_unlock(&gli->mutex); - return rc; -} - -/** - * cxlflash_lun_detach() - detaches a user from a LUN and resets the LUN's mode - * @gli: LUN to detach. - * - * When resetting the mode, terminate block allocation resources as they - * are no longer required (service is safe to call even when block allocation - * resources were not present - such as when transitioning from physical mode). - * These resources will be reallocated when needed (subsequent transition to - * virtual mode). - */ -void cxlflash_lun_detach(struct glun_info *gli) -{ - mutex_lock(&gli->mutex); - WARN_ON(gli->mode == MODE_NONE); - if (--gli->users == 0) { - gli->mode = MODE_NONE; - cxlflash_ba_terminate(&gli->blka.ba_lun); - } - pr_debug("%s: gli->users=%u\n", __func__, gli->users); - WARN_ON(gli->users < 0); - mutex_unlock(&gli->mutex); -} - -/** - * _cxlflash_disk_release() - releases the specified resource entry - * @sdev: SCSI device associated with LUN. - * @ctxi: Context owning resources. - * @release: Release ioctl data structure. - * - * For LUNs in virtual mode, the virtual LUN associated with the specified - * resource handle is resized to 0 prior to releasing the RHTE. Note that the - * AFU sync should _not_ be performed when the context is sitting on the error - * recovery list. A context on the error recovery list is not known to the AFU - * due to reset. When the context is recovered, it will be reattached and made - * known again to the AFU. - * - * Return: 0 on success, -errno on failure - */ -int _cxlflash_disk_release(struct scsi_device *sdev, - struct ctx_info *ctxi, - struct dk_cxlflash_release *release) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct afu *afu = cfg->afu; - bool put_ctx = false; - - struct dk_cxlflash_resize size; - res_hndl_t rhndl = release->rsrc_handle; - - int rc = 0; - int rcr = 0; - u64 ctxid = DECODE_CTXID(release->context_id), - rctxid = release->context_id; - - struct sisl_rht_entry *rhte; - struct sisl_rht_entry_f1 *rhte_f1; - - dev_dbg(dev, "%s: ctxid=%llu rhndl=%llu gli->mode=%u gli->users=%u\n", - __func__, ctxid, release->rsrc_handle, gli->mode, gli->users); - - if (!ctxi) { - ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", - __func__, ctxid); - rc = -EINVAL; - goto out; - } - - put_ctx = true; - } - - rhte = get_rhte(ctxi, rhndl, lli); - if (unlikely(!rhte)) { - dev_dbg(dev, "%s: Bad resource handle rhndl=%d\n", - __func__, rhndl); - rc = -EINVAL; - goto out; - } - - /* - * Resize to 0 for virtual LUNS by setting the size - * to 0. This will clear LXT_START and LXT_CNT fields - * in the RHT entry and properly sync with the AFU. - * - * Afterwards we clear the remaining fields. - */ - switch (gli->mode) { - case MODE_VIRTUAL: - marshal_rele_to_resize(release, &size); - size.req_size = 0; - rc = _cxlflash_vlun_resize(sdev, ctxi, &size); - if (rc) { - dev_dbg(dev, "%s: resize failed rc %d\n", __func__, rc); - goto out; - } - - break; - case MODE_PHYSICAL: - /* - * Clear the Format 1 RHT entry for direct access - * (physical LUN) using the synchronization sequence - * defined in the SISLite specification. - */ - rhte_f1 = (struct sisl_rht_entry_f1 *)rhte; - - rhte_f1->valid = 0; - dma_wmb(); /* Make revocation of RHT entry visible */ - - rhte_f1->lun_id = 0; - dma_wmb(); /* Make clearing of LUN id visible */ - - rhte_f1->dw = 0; - dma_wmb(); /* Make RHT entry bottom-half clearing visible */ - - if (!ctxi->err_recovery_active) { - rcr = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); - if (unlikely(rcr)) - dev_dbg(dev, "%s: AFU sync failed rc=%d\n", - __func__, rcr); - } - break; - default: - WARN(1, "Unsupported LUN mode!"); - goto out; - } - - rhte_checkin(ctxi, rhte); - cxlflash_lun_detach(gli); - -out: - if (put_ctx) - put_context(ctxi); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -int cxlflash_disk_release(struct scsi_device *sdev, - struct dk_cxlflash_release *release) -{ - return _cxlflash_disk_release(sdev, NULL, release); -} - -/** - * destroy_context() - releases a context - * @cfg: Internal structure associated with the host. - * @ctxi: Context to release. - * - * This routine is safe to be called with a a non-initialized context. - * Also note that the routine conditionally checks for the existence - * of the context control map before clearing the RHT registers and - * context capabilities because it is possible to destroy a context - * while the context is in the error state (previous mapping was - * removed [so there is no need to worry about clearing] and context - * is waiting for a new mapping). - */ -static void destroy_context(struct cxlflash_cfg *cfg, - struct ctx_info *ctxi) -{ - struct afu *afu = cfg->afu; - - if (ctxi->initialized) { - WARN_ON(!list_empty(&ctxi->luns)); - - /* Clear RHT registers and drop all capabilities for context */ - if (afu->afu_map && ctxi->ctrl_map) { - writeq_be(0, &ctxi->ctrl_map->rht_start); - writeq_be(0, &ctxi->ctrl_map->rht_cnt_id); - writeq_be(0, &ctxi->ctrl_map->ctx_cap); - } - } - - /* Free memory associated with context */ - free_page((ulong)ctxi->rht_start); - kfree(ctxi->rht_needs_ws); - kfree(ctxi->rht_lun); - kfree(ctxi); -} - -/** - * create_context() - allocates and initializes a context - * @cfg: Internal structure associated with the host. - * - * Return: Allocated context on success, NULL on failure - */ -static struct ctx_info *create_context(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - struct ctx_info *ctxi = NULL; - struct llun_info **lli = NULL; - u8 *ws = NULL; - struct sisl_rht_entry *rhte; - - ctxi = kzalloc(sizeof(*ctxi), GFP_KERNEL); - lli = kzalloc((MAX_RHT_PER_CONTEXT * sizeof(*lli)), GFP_KERNEL); - ws = kzalloc((MAX_RHT_PER_CONTEXT * sizeof(*ws)), GFP_KERNEL); - if (unlikely(!ctxi || !lli || !ws)) { - dev_err(dev, "%s: Unable to allocate context\n", __func__); - goto err; - } - - rhte = (struct sisl_rht_entry *)get_zeroed_page(GFP_KERNEL); - if (unlikely(!rhte)) { - dev_err(dev, "%s: Unable to allocate RHT\n", __func__); - goto err; - } - - ctxi->rht_lun = lli; - ctxi->rht_needs_ws = ws; - ctxi->rht_start = rhte; -out: - return ctxi; - -err: - kfree(ws); - kfree(lli); - kfree(ctxi); - ctxi = NULL; - goto out; -} - -/** - * init_context() - initializes a previously allocated context - * @ctxi: Previously allocated context - * @cfg: Internal structure associated with the host. - * @ctx: Previously obtained context cookie. - * @ctxid: Previously obtained process element associated with CXL context. - * @file: Previously obtained file associated with CXL context. - * @perms: User-specified permissions. - * @irqs: User-specified number of interrupts. - */ -static void init_context(struct ctx_info *ctxi, struct cxlflash_cfg *cfg, - void *ctx, int ctxid, struct file *file, u32 perms, - u64 irqs) -{ - struct afu *afu = cfg->afu; - - ctxi->rht_perms = perms; - ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl; - ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid); - ctxi->irqs = irqs; - ctxi->pid = task_tgid_nr(current); /* tgid = pid */ - ctxi->ctx = ctx; - ctxi->cfg = cfg; - ctxi->file = file; - ctxi->initialized = true; - mutex_init(&ctxi->mutex); - kref_init(&ctxi->kref); - INIT_LIST_HEAD(&ctxi->luns); - INIT_LIST_HEAD(&ctxi->list); /* initialize for list_empty() */ -} - -/** - * remove_context() - context kref release handler - * @kref: Kernel reference associated with context to be removed. - * - * When a context no longer has any references it can safely be removed - * from global access and destroyed. Note that it is assumed the thread - * relinquishing access to the context holds its mutex. - */ -static void remove_context(struct kref *kref) -{ - struct ctx_info *ctxi = container_of(kref, struct ctx_info, kref); - struct cxlflash_cfg *cfg = ctxi->cfg; - u64 ctxid = DECODE_CTXID(ctxi->ctxid); - - /* Remove context from table/error list */ - WARN_ON(!mutex_is_locked(&ctxi->mutex)); - ctxi->unavail = true; - mutex_unlock(&ctxi->mutex); - mutex_lock(&cfg->ctx_tbl_list_mutex); - mutex_lock(&ctxi->mutex); - - if (!list_empty(&ctxi->list)) - list_del(&ctxi->list); - cfg->ctx_tbl[ctxid] = NULL; - mutex_unlock(&cfg->ctx_tbl_list_mutex); - mutex_unlock(&ctxi->mutex); - - /* Context now completely uncoupled/unreachable */ - destroy_context(cfg, ctxi); -} - -/** - * _cxlflash_disk_detach() - detaches a LUN from a context - * @sdev: SCSI device associated with LUN. - * @ctxi: Context owning resources. - * @detach: Detach ioctl data structure. - * - * As part of the detach, all per-context resources associated with the LUN - * are cleaned up. When detaching the last LUN for a context, the context - * itself is cleaned up and released. - * - * Return: 0 on success, -errno on failure - */ -static int _cxlflash_disk_detach(struct scsi_device *sdev, - struct ctx_info *ctxi, - struct dk_cxlflash_detach *detach) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct lun_access *lun_access, *t; - struct dk_cxlflash_release rel; - bool put_ctx = false; - - int i; - int rc = 0; - u64 ctxid = DECODE_CTXID(detach->context_id), - rctxid = detach->context_id; - - dev_dbg(dev, "%s: ctxid=%llu\n", __func__, ctxid); - - if (!ctxi) { - ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", - __func__, ctxid); - rc = -EINVAL; - goto out; - } - - put_ctx = true; - } - - /* Cleanup outstanding resources tied to this LUN */ - if (ctxi->rht_out) { - marshal_det_to_rele(detach, &rel); - for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) { - if (ctxi->rht_lun[i] == lli) { - rel.rsrc_handle = i; - _cxlflash_disk_release(sdev, ctxi, &rel); - } - - /* No need to loop further if we're done */ - if (ctxi->rht_out == 0) - break; - } - } - - /* Take our LUN out of context, free the node */ - list_for_each_entry_safe(lun_access, t, &ctxi->luns, list) - if (lun_access->lli == lli) { - list_del(&lun_access->list); - kfree(lun_access); - lun_access = NULL; - break; - } - - /* - * Release the context reference and the sdev reference that - * bound this LUN to the context. - */ - if (kref_put(&ctxi->kref, remove_context)) - put_ctx = false; - scsi_device_put(sdev); -out: - if (put_ctx) - put_context(ctxi); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -static int cxlflash_disk_detach(struct scsi_device *sdev, - struct dk_cxlflash_detach *detach) -{ - return _cxlflash_disk_detach(sdev, NULL, detach); -} - -/** - * cxlflash_cxl_release() - release handler for adapter file descriptor - * @inode: File-system inode associated with fd. - * @file: File installed with adapter file descriptor. - * - * This routine is the release handler for the fops registered with - * the CXL services on an initial attach for a context. It is called - * when a close (explicity by the user or as part of a process tear - * down) is performed on the adapter file descriptor returned to the - * user. The user should be aware that explicitly performing a close - * considered catastrophic and subsequent usage of the superpipe API - * with previously saved off tokens will fail. - * - * This routine derives the context reference and calls detach for - * each LUN associated with the context.The final detach operation - * causes the context itself to be freed. With exception to when the - * CXL process element (context id) lookup fails (a case that should - * theoretically never occur), every call into this routine results - * in a complete freeing of a context. - * - * Detaching the LUN is typically an ioctl() operation and the underlying - * code assumes that ioctl_rwsem has been acquired as a reader. To support - * that design point, the semaphore is acquired and released around detach. - * - * Return: 0 on success - */ -static int cxlflash_cxl_release(struct inode *inode, struct file *file) -{ - struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, - cxl_fops); - void *ctx = cfg->ops->fops_get_context(file); - struct device *dev = &cfg->dev->dev; - struct ctx_info *ctxi = NULL; - struct dk_cxlflash_detach detach = { { 0 }, 0 }; - struct lun_access *lun_access, *t; - enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; - int ctxid; - - ctxid = cfg->ops->process_element(ctx); - if (unlikely(ctxid < 0)) { - dev_err(dev, "%s: Context %p was closed ctxid=%d\n", - __func__, ctx, ctxid); - goto out; - } - - ctxi = get_context(cfg, ctxid, file, ctrl); - if (unlikely(!ctxi)) { - ctxi = get_context(cfg, ctxid, file, ctrl | CTX_CTRL_CLONE); - if (!ctxi) { - dev_dbg(dev, "%s: ctxid=%d already free\n", - __func__, ctxid); - goto out_release; - } - - dev_dbg(dev, "%s: Another process owns ctxid=%d\n", - __func__, ctxid); - put_context(ctxi); - goto out; - } - - dev_dbg(dev, "%s: close for ctxid=%d\n", __func__, ctxid); - - down_read(&cfg->ioctl_rwsem); - detach.context_id = ctxi->ctxid; - list_for_each_entry_safe(lun_access, t, &ctxi->luns, list) - _cxlflash_disk_detach(lun_access->sdev, ctxi, &detach); - up_read(&cfg->ioctl_rwsem); -out_release: - cfg->ops->fd_release(inode, file); -out: - dev_dbg(dev, "%s: returning\n", __func__); - return 0; -} - -/** - * unmap_context() - clears a previously established mapping - * @ctxi: Context owning the mapping. - * - * This routine is used to switch between the error notification page - * (dummy page of all 1's) and the real mapping (established by the CXL - * fault handler). - */ -static void unmap_context(struct ctx_info *ctxi) -{ - unmap_mapping_range(ctxi->file->f_mapping, 0, 0, 1); -} - -/** - * get_err_page() - obtains and allocates the error notification page - * @cfg: Internal structure associated with the host. - * - * Return: error notification page on success, NULL on failure - */ -static struct page *get_err_page(struct cxlflash_cfg *cfg) -{ - struct page *err_page = global.err_page; - struct device *dev = &cfg->dev->dev; - - if (unlikely(!err_page)) { - err_page = alloc_page(GFP_KERNEL); - if (unlikely(!err_page)) { - dev_err(dev, "%s: Unable to allocate err_page\n", - __func__); - goto out; - } - - memset(page_address(err_page), -1, PAGE_SIZE); - - /* Serialize update w/ other threads to avoid a leak */ - mutex_lock(&global.mutex); - if (likely(!global.err_page)) - global.err_page = err_page; - else { - __free_page(err_page); - err_page = global.err_page; - } - mutex_unlock(&global.mutex); - } - -out: - dev_dbg(dev, "%s: returning err_page=%p\n", __func__, err_page); - return err_page; -} - -/** - * cxlflash_mmap_fault() - mmap fault handler for adapter file descriptor - * @vmf: VM fault associated with current fault. - * - * To support error notification via MMIO, faults are 'caught' by this routine - * that was inserted before passing back the adapter file descriptor on attach. - * When a fault occurs, this routine evaluates if error recovery is active and - * if so, installs the error page to 'notify' the user about the error state. - * During normal operation, the fault is simply handled by the original fault - * handler that was installed by CXL services as part of initializing the - * adapter file descriptor. The VMA's page protection bits are toggled to - * indicate cached/not-cached depending on the memory backing the fault. - * - * Return: 0 on success, VM_FAULT_SIGBUS on failure - */ -static vm_fault_t cxlflash_mmap_fault(struct vm_fault *vmf) -{ - struct vm_area_struct *vma = vmf->vma; - struct file *file = vma->vm_file; - struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, - cxl_fops); - void *ctx = cfg->ops->fops_get_context(file); - struct device *dev = &cfg->dev->dev; - struct ctx_info *ctxi = NULL; - struct page *err_page = NULL; - enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; - vm_fault_t rc = 0; - int ctxid; - - ctxid = cfg->ops->process_element(ctx); - if (unlikely(ctxid < 0)) { - dev_err(dev, "%s: Context %p was closed ctxid=%d\n", - __func__, ctx, ctxid); - goto err; - } - - ctxi = get_context(cfg, ctxid, file, ctrl); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%d\n", __func__, ctxid); - goto err; - } - - dev_dbg(dev, "%s: fault for context %d\n", __func__, ctxid); - - if (likely(!ctxi->err_recovery_active)) { - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - rc = ctxi->cxl_mmap_vmops->fault(vmf); - } else { - dev_dbg(dev, "%s: err recovery active, use err_page\n", - __func__); - - err_page = get_err_page(cfg); - if (unlikely(!err_page)) { - dev_err(dev, "%s: Could not get err_page\n", __func__); - rc = VM_FAULT_RETRY; - goto out; - } - - get_page(err_page); - vmf->page = err_page; - vma->vm_page_prot = pgprot_cached(vma->vm_page_prot); - } - -out: - if (likely(ctxi)) - put_context(ctxi); - dev_dbg(dev, "%s: returning rc=%x\n", __func__, rc); - return rc; - -err: - rc = VM_FAULT_SIGBUS; - goto out; -} - -/* - * Local MMAP vmops to 'catch' faults - */ -static const struct vm_operations_struct cxlflash_mmap_vmops = { - .fault = cxlflash_mmap_fault, -}; - -/** - * cxlflash_cxl_mmap() - mmap handler for adapter file descriptor - * @file: File installed with adapter file descriptor. - * @vma: VM area associated with mapping. - * - * Installs local mmap vmops to 'catch' faults for error notification support. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_cxl_mmap(struct file *file, struct vm_area_struct *vma) -{ - struct cxlflash_cfg *cfg = container_of(file->f_op, struct cxlflash_cfg, - cxl_fops); - void *ctx = cfg->ops->fops_get_context(file); - struct device *dev = &cfg->dev->dev; - struct ctx_info *ctxi = NULL; - enum ctx_ctrl ctrl = CTX_CTRL_ERR_FALLBACK | CTX_CTRL_FILE; - int ctxid; - int rc = 0; - - ctxid = cfg->ops->process_element(ctx); - if (unlikely(ctxid < 0)) { - dev_err(dev, "%s: Context %p was closed ctxid=%d\n", - __func__, ctx, ctxid); - rc = -EIO; - goto out; - } - - ctxi = get_context(cfg, ctxid, file, ctrl); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%d\n", __func__, ctxid); - rc = -EIO; - goto out; - } - - dev_dbg(dev, "%s: mmap for context %d\n", __func__, ctxid); - - rc = cfg->ops->fd_mmap(file, vma); - if (likely(!rc)) { - /* Insert ourself in the mmap fault handler path */ - ctxi->cxl_mmap_vmops = vma->vm_ops; - vma->vm_ops = &cxlflash_mmap_vmops; - } - -out: - if (likely(ctxi)) - put_context(ctxi); - return rc; -} - -const struct file_operations cxlflash_cxl_fops = { - .owner = THIS_MODULE, - .mmap = cxlflash_cxl_mmap, - .release = cxlflash_cxl_release, -}; - -/** - * cxlflash_mark_contexts_error() - move contexts to error state and list - * @cfg: Internal structure associated with the host. - * - * A context is only moved over to the error list when there are no outstanding - * references to it. This ensures that a running operation has completed. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg) -{ - int i, rc = 0; - struct ctx_info *ctxi = NULL; - - mutex_lock(&cfg->ctx_tbl_list_mutex); - - for (i = 0; i < MAX_CONTEXT; i++) { - ctxi = cfg->ctx_tbl[i]; - if (ctxi) { - mutex_lock(&ctxi->mutex); - cfg->ctx_tbl[i] = NULL; - list_add(&ctxi->list, &cfg->ctx_err_recovery); - ctxi->err_recovery_active = true; - ctxi->ctrl_map = NULL; - unmap_context(ctxi); - mutex_unlock(&ctxi->mutex); - } - } - - mutex_unlock(&cfg->ctx_tbl_list_mutex); - return rc; -} - -/* - * Dummy NULL fops - */ -static const struct file_operations null_fops = { - .owner = THIS_MODULE, -}; - -/** - * check_state() - checks and responds to the current adapter state - * @cfg: Internal structure associated with the host. - * - * This routine can block and should only be used on process context. - * It assumes that the caller is an ioctl thread and holding the ioctl - * read semaphore. This is temporarily let up across the wait to allow - * for draining actively running ioctls. Also note that when waking up - * from waiting in reset, the state is unknown and must be checked again - * before proceeding. - * - * Return: 0 on success, -errno on failure - */ -int check_state(struct cxlflash_cfg *cfg) -{ - struct device *dev = &cfg->dev->dev; - int rc = 0; - -retry: - switch (cfg->state) { - case STATE_RESET: - dev_dbg(dev, "%s: Reset state, going to wait...\n", __func__); - up_read(&cfg->ioctl_rwsem); - rc = wait_event_interruptible(cfg->reset_waitq, - cfg->state != STATE_RESET); - down_read(&cfg->ioctl_rwsem); - if (unlikely(rc)) - break; - goto retry; - case STATE_FAILTERM: - dev_dbg(dev, "%s: Failed/Terminating\n", __func__); - rc = -ENODEV; - break; - default: - break; - } - - return rc; -} - -/** - * cxlflash_disk_attach() - attach a LUN to a context - * @sdev: SCSI device associated with LUN. - * @attach: Attach ioctl data structure. - * - * Creates a context and attaches LUN to it. A LUN can only be attached - * one time to a context (subsequent attaches for the same context/LUN pair - * are not supported). Additional LUNs can be attached to a context by - * specifying the 'reuse' flag defined in the cxlflash_ioctl.h header. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_disk_attach(struct scsi_device *sdev, - struct dk_cxlflash_attach *attach) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct ctx_info *ctxi = NULL; - struct lun_access *lun_access = NULL; - int rc = 0; - u32 perms; - int ctxid = -1; - u64 irqs = attach->num_interrupts; - u64 flags = 0UL; - u64 rctxid = 0UL; - struct file *file = NULL; - - void *ctx = NULL; - - int fd = -1; - - if (irqs > 4) { - dev_dbg(dev, "%s: Cannot support this many interrupts %llu\n", - __func__, irqs); - rc = -EINVAL; - goto out; - } - - if (gli->max_lba == 0) { - dev_dbg(dev, "%s: No capacity info for LUN=%016llx\n", - __func__, lli->lun_id[sdev->channel]); - rc = read_cap16(sdev, lli); - if (rc) { - dev_err(dev, "%s: Invalid device rc=%d\n", - __func__, rc); - rc = -ENODEV; - goto out; - } - dev_dbg(dev, "%s: LBA = %016llx\n", __func__, gli->max_lba); - dev_dbg(dev, "%s: BLK_LEN = %08x\n", __func__, gli->blk_len); - } - - if (attach->hdr.flags & DK_CXLFLASH_ATTACH_REUSE_CONTEXT) { - rctxid = attach->context_id; - ctxi = get_context(cfg, rctxid, NULL, 0); - if (!ctxi) { - dev_dbg(dev, "%s: Bad context rctxid=%016llx\n", - __func__, rctxid); - rc = -EINVAL; - goto out; - } - - list_for_each_entry(lun_access, &ctxi->luns, list) - if (lun_access->lli == lli) { - dev_dbg(dev, "%s: Already attached\n", - __func__); - rc = -EINVAL; - goto out; - } - } - - rc = scsi_device_get(sdev); - if (unlikely(rc)) { - dev_err(dev, "%s: Unable to get sdev reference\n", __func__); - goto out; - } - - lun_access = kzalloc(sizeof(*lun_access), GFP_KERNEL); - if (unlikely(!lun_access)) { - dev_err(dev, "%s: Unable to allocate lun_access\n", __func__); - rc = -ENOMEM; - goto err; - } - - lun_access->lli = lli; - lun_access->sdev = sdev; - - /* Non-NULL context indicates reuse (another context reference) */ - if (ctxi) { - dev_dbg(dev, "%s: Reusing context for LUN rctxid=%016llx\n", - __func__, rctxid); - kref_get(&ctxi->kref); - list_add(&lun_access->list, &ctxi->luns); - goto out_attach; - } - - ctxi = create_context(cfg); - if (unlikely(!ctxi)) { - dev_err(dev, "%s: Failed to create context ctxid=%d\n", - __func__, ctxid); - rc = -ENOMEM; - goto err; - } - - ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie); - if (IS_ERR_OR_NULL(ctx)) { - dev_err(dev, "%s: Could not initialize context %p\n", - __func__, ctx); - rc = -ENODEV; - goto err; - } - - rc = cfg->ops->start_work(ctx, irqs); - if (unlikely(rc)) { - dev_dbg(dev, "%s: Could not start context rc=%d\n", - __func__, rc); - goto err; - } - - ctxid = cfg->ops->process_element(ctx); - if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) { - dev_err(dev, "%s: ctxid=%d invalid\n", __func__, ctxid); - rc = -EPERM; - goto err; - } - - file = cfg->ops->get_fd(ctx, &cfg->cxl_fops, &fd); - if (unlikely(fd < 0)) { - rc = -ENODEV; - dev_err(dev, "%s: Could not get file descriptor\n", __func__); - goto err; - } - - /* Translate read/write O_* flags from fcntl.h to AFU permission bits */ - perms = SISL_RHT_PERM(attach->hdr.flags + 1); - - /* Context mutex is locked upon return */ - init_context(ctxi, cfg, ctx, ctxid, file, perms, irqs); - - rc = afu_attach(cfg, ctxi); - if (unlikely(rc)) { - dev_err(dev, "%s: Could not attach AFU rc %d\n", __func__, rc); - goto err; - } - - /* - * No error paths after this point. Once the fd is installed it's - * visible to user space and can't be undone safely on this thread. - * There is no need to worry about a deadlock here because no one - * knows about us yet; we can be the only one holding our mutex. - */ - list_add(&lun_access->list, &ctxi->luns); - mutex_lock(&cfg->ctx_tbl_list_mutex); - mutex_lock(&ctxi->mutex); - cfg->ctx_tbl[ctxid] = ctxi; - mutex_unlock(&cfg->ctx_tbl_list_mutex); - fd_install(fd, file); - -out_attach: - if (fd != -1) - flags |= DK_CXLFLASH_APP_CLOSE_ADAP_FD; - if (afu_is_sq_cmd_mode(afu)) - flags |= DK_CXLFLASH_CONTEXT_SQ_CMD_MODE; - - attach->hdr.return_flags = flags; - attach->context_id = ctxi->ctxid; - attach->block_size = gli->blk_len; - attach->mmio_size = sizeof(afu->afu_map->hosts[0].harea); - attach->last_lba = gli->max_lba; - attach->max_xfer = sdev->host->max_sectors * MAX_SECTOR_UNIT; - attach->max_xfer /= gli->blk_len; - -out: - attach->adap_fd = fd; - - if (ctxi) - put_context(ctxi); - - dev_dbg(dev, "%s: returning ctxid=%d fd=%d bs=%lld rc=%d llba=%lld\n", - __func__, ctxid, fd, attach->block_size, rc, attach->last_lba); - return rc; - -err: - /* Cleanup CXL context; okay to 'stop' even if it was not started */ - if (!IS_ERR_OR_NULL(ctx)) { - cfg->ops->stop_context(ctx); - cfg->ops->release_context(ctx); - ctx = NULL; - } - - /* - * Here, we're overriding the fops with a dummy all-NULL fops because - * fput() calls the release fop, which will cause us to mistakenly - * call into the CXL code. Rather than try to add yet more complexity - * to that routine (cxlflash_cxl_release) we should try to fix the - * issue here. - */ - if (fd > 0) { - file->f_op = &null_fops; - fput(file); - put_unused_fd(fd); - fd = -1; - file = NULL; - } - - /* Cleanup our context */ - if (ctxi) { - destroy_context(cfg, ctxi); - ctxi = NULL; - } - - kfree(lun_access); - scsi_device_put(sdev); - goto out; -} - -/** - * recover_context() - recovers a context in error - * @cfg: Internal structure associated with the host. - * @ctxi: Context to release. - * @adap_fd: Adapter file descriptor associated with new/recovered context. - * - * Restablishes the state for a context-in-error. - * - * Return: 0 on success, -errno on failure - */ -static int recover_context(struct cxlflash_cfg *cfg, - struct ctx_info *ctxi, - int *adap_fd) -{ - struct device *dev = &cfg->dev->dev; - int rc = 0; - int fd = -1; - int ctxid = -1; - struct file *file; - void *ctx; - struct afu *afu = cfg->afu; - - ctx = cfg->ops->dev_context_init(cfg->dev, cfg->afu_cookie); - if (IS_ERR_OR_NULL(ctx)) { - dev_err(dev, "%s: Could not initialize context %p\n", - __func__, ctx); - rc = -ENODEV; - goto out; - } - - rc = cfg->ops->start_work(ctx, ctxi->irqs); - if (unlikely(rc)) { - dev_dbg(dev, "%s: Could not start context rc=%d\n", - __func__, rc); - goto err1; - } - - ctxid = cfg->ops->process_element(ctx); - if (unlikely((ctxid >= MAX_CONTEXT) || (ctxid < 0))) { - dev_err(dev, "%s: ctxid=%d invalid\n", __func__, ctxid); - rc = -EPERM; - goto err2; - } - - file = cfg->ops->get_fd(ctx, &cfg->cxl_fops, &fd); - if (unlikely(fd < 0)) { - rc = -ENODEV; - dev_err(dev, "%s: Could not get file descriptor\n", __func__); - goto err2; - } - - /* Update with new MMIO area based on updated context id */ - ctxi->ctrl_map = &afu->afu_map->ctrls[ctxid].ctrl; - - rc = afu_attach(cfg, ctxi); - if (rc) { - dev_err(dev, "%s: Could not attach AFU rc %d\n", __func__, rc); - goto err3; - } - - /* - * No error paths after this point. Once the fd is installed it's - * visible to user space and can't be undone safely on this thread. - */ - ctxi->ctxid = ENCODE_CTXID(ctxi, ctxid); - ctxi->ctx = ctx; - ctxi->file = file; - - /* - * Put context back in table (note the reinit of the context list); - * we must first drop the context's mutex and then acquire it in - * order with the table/list mutex to avoid a deadlock - safe to do - * here because no one can find us at this moment in time. - */ - mutex_unlock(&ctxi->mutex); - mutex_lock(&cfg->ctx_tbl_list_mutex); - mutex_lock(&ctxi->mutex); - list_del_init(&ctxi->list); - cfg->ctx_tbl[ctxid] = ctxi; - mutex_unlock(&cfg->ctx_tbl_list_mutex); - fd_install(fd, file); - *adap_fd = fd; -out: - dev_dbg(dev, "%s: returning ctxid=%d fd=%d rc=%d\n", - __func__, ctxid, fd, rc); - return rc; - -err3: - fput(file); - put_unused_fd(fd); -err2: - cfg->ops->stop_context(ctx); -err1: - cfg->ops->release_context(ctx); - goto out; -} - -/** - * cxlflash_afu_recover() - initiates AFU recovery - * @sdev: SCSI device associated with LUN. - * @recover: Recover ioctl data structure. - * - * Only a single recovery is allowed at a time to avoid exhausting CXL - * resources (leading to recovery failure) in the event that we're up - * against the maximum number of contexts limit. For similar reasons, - * a context recovery is retried if there are multiple recoveries taking - * place at the same time and the failure was due to CXL services being - * unable to keep up. - * - * As this routine is called on ioctl context, it holds the ioctl r/w - * semaphore that is used to drain ioctls in recovery scenarios. The - * implementation to achieve the pacing described above (a local mutex) - * requires that the ioctl r/w semaphore be dropped and reacquired to - * avoid a 3-way deadlock when multiple process recoveries operate in - * parallel. - * - * Because a user can detect an error condition before the kernel, it is - * quite possible for this routine to act as the kernel's EEH detection - * source (MMIO read of mbox_r). Because of this, there is a window of - * time where an EEH might have been detected but not yet 'serviced' - * (callback invoked, causing the device to enter reset state). To avoid - * looping in this routine during that window, a 1 second sleep is in place - * between the time the MMIO failure is detected and the time a wait on the - * reset wait queue is attempted via check_state(). - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_afu_recover(struct scsi_device *sdev, - struct dk_cxlflash_recover_afu *recover) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct afu *afu = cfg->afu; - struct ctx_info *ctxi = NULL; - struct mutex *mutex = &cfg->ctx_recovery_mutex; - struct hwq *hwq = get_hwq(afu, PRIMARY_HWQ); - u64 flags; - u64 ctxid = DECODE_CTXID(recover->context_id), - rctxid = recover->context_id; - long reg; - bool locked = true; - int lretry = 20; /* up to 2 seconds */ - int new_adap_fd = -1; - int rc = 0; - - atomic_inc(&cfg->recovery_threads); - up_read(&cfg->ioctl_rwsem); - rc = mutex_lock_interruptible(mutex); - down_read(&cfg->ioctl_rwsem); - if (rc) { - locked = false; - goto out; - } - - rc = check_state(cfg); - if (rc) { - dev_err(dev, "%s: Failed state rc=%d\n", __func__, rc); - rc = -ENODEV; - goto out; - } - - dev_dbg(dev, "%s: reason=%016llx rctxid=%016llx\n", - __func__, recover->reason, rctxid); - -retry: - /* Ensure that this process is attached to the context */ - ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", __func__, ctxid); - rc = -EINVAL; - goto out; - } - - if (ctxi->err_recovery_active) { -retry_recover: - rc = recover_context(cfg, ctxi, &new_adap_fd); - if (unlikely(rc)) { - dev_err(dev, "%s: Recovery failed ctxid=%llu rc=%d\n", - __func__, ctxid, rc); - if ((rc == -ENODEV) && - ((atomic_read(&cfg->recovery_threads) > 1) || - (lretry--))) { - dev_dbg(dev, "%s: Going to try again\n", - __func__); - mutex_unlock(mutex); - msleep(100); - rc = mutex_lock_interruptible(mutex); - if (rc) { - locked = false; - goto out; - } - goto retry_recover; - } - - goto out; - } - - ctxi->err_recovery_active = false; - - flags = DK_CXLFLASH_APP_CLOSE_ADAP_FD | - DK_CXLFLASH_RECOVER_AFU_CONTEXT_RESET; - if (afu_is_sq_cmd_mode(afu)) - flags |= DK_CXLFLASH_CONTEXT_SQ_CMD_MODE; - - recover->hdr.return_flags = flags; - recover->context_id = ctxi->ctxid; - recover->adap_fd = new_adap_fd; - recover->mmio_size = sizeof(afu->afu_map->hosts[0].harea); - goto out; - } - - /* Test if in error state */ - reg = readq_be(&hwq->ctrl_map->mbox_r); - if (reg == -1) { - dev_dbg(dev, "%s: MMIO fail, wait for recovery.\n", __func__); - - /* - * Before checking the state, put back the context obtained with - * get_context() as it is no longer needed and sleep for a short - * period of time (see prolog notes). - */ - put_context(ctxi); - ctxi = NULL; - ssleep(1); - rc = check_state(cfg); - if (unlikely(rc)) - goto out; - goto retry; - } - - dev_dbg(dev, "%s: MMIO working, no recovery required\n", __func__); -out: - if (likely(ctxi)) - put_context(ctxi); - if (locked) - mutex_unlock(mutex); - atomic_dec_if_positive(&cfg->recovery_threads); - return rc; -} - -/** - * process_sense() - evaluates and processes sense data - * @sdev: SCSI device associated with LUN. - * @verify: Verify ioctl data structure. - * - * Return: 0 on success, -errno on failure - */ -static int process_sense(struct scsi_device *sdev, - struct dk_cxlflash_verify *verify) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - u64 prev_lba = gli->max_lba; - struct scsi_sense_hdr sshdr = { 0 }; - int rc = 0; - - rc = scsi_normalize_sense((const u8 *)&verify->sense_data, - DK_CXLFLASH_VERIFY_SENSE_LEN, &sshdr); - if (!rc) { - dev_err(dev, "%s: Failed to normalize sense data\n", __func__); - rc = -EINVAL; - goto out; - } - - switch (sshdr.sense_key) { - case NO_SENSE: - case RECOVERED_ERROR: - case NOT_READY: - break; - case UNIT_ATTENTION: - switch (sshdr.asc) { - case 0x29: /* Power on Reset or Device Reset */ - fallthrough; - case 0x2A: /* Device settings/capacity changed */ - rc = read_cap16(sdev, lli); - if (rc) { - rc = -ENODEV; - break; - } - if (prev_lba != gli->max_lba) - dev_dbg(dev, "%s: Capacity changed old=%lld " - "new=%lld\n", __func__, prev_lba, - gli->max_lba); - break; - case 0x3F: /* Report LUNs changed, Rescan. */ - scsi_scan_host(cfg->host); - break; - default: - rc = -EIO; - break; - } - break; - default: - rc = -EIO; - break; - } -out: - dev_dbg(dev, "%s: sense_key %x asc %x ascq %x rc %d\n", __func__, - sshdr.sense_key, sshdr.asc, sshdr.ascq, rc); - return rc; -} - -/** - * cxlflash_disk_verify() - verifies a LUN is the same and handle size changes - * @sdev: SCSI device associated with LUN. - * @verify: Verify ioctl data structure. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_disk_verify(struct scsi_device *sdev, - struct dk_cxlflash_verify *verify) -{ - int rc = 0; - struct ctx_info *ctxi = NULL; - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct sisl_rht_entry *rhte = NULL; - res_hndl_t rhndl = verify->rsrc_handle; - u64 ctxid = DECODE_CTXID(verify->context_id), - rctxid = verify->context_id; - u64 last_lba = 0; - - dev_dbg(dev, "%s: ctxid=%llu rhndl=%016llx, hint=%016llx, " - "flags=%016llx\n", __func__, ctxid, verify->rsrc_handle, - verify->hint, verify->hdr.flags); - - ctxi = get_context(cfg, rctxid, lli, 0); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", __func__, ctxid); - rc = -EINVAL; - goto out; - } - - rhte = get_rhte(ctxi, rhndl, lli); - if (unlikely(!rhte)) { - dev_dbg(dev, "%s: Bad resource handle rhndl=%d\n", - __func__, rhndl); - rc = -EINVAL; - goto out; - } - - /* - * Look at the hint/sense to see if it requires us to redrive - * inquiry (i.e. the Unit attention is due to the WWN changing). - */ - if (verify->hint & DK_CXLFLASH_VERIFY_HINT_SENSE) { - /* Can't hold mutex across process_sense/read_cap16, - * since we could have an intervening EEH event. - */ - ctxi->unavail = true; - mutex_unlock(&ctxi->mutex); - rc = process_sense(sdev, verify); - if (unlikely(rc)) { - dev_err(dev, "%s: Failed to validate sense data (%d)\n", - __func__, rc); - mutex_lock(&ctxi->mutex); - ctxi->unavail = false; - goto out; - } - mutex_lock(&ctxi->mutex); - ctxi->unavail = false; - } - - switch (gli->mode) { - case MODE_PHYSICAL: - last_lba = gli->max_lba; - break; - case MODE_VIRTUAL: - /* Cast lxt_cnt to u64 for multiply to be treated as 64bit op */ - last_lba = ((u64)rhte->lxt_cnt * MC_CHUNK_SIZE * gli->blk_len); - last_lba /= CXLFLASH_BLOCK_SIZE; - last_lba--; - break; - default: - WARN(1, "Unsupported LUN mode!"); - } - - verify->last_lba = last_lba; - -out: - if (likely(ctxi)) - put_context(ctxi); - dev_dbg(dev, "%s: returning rc=%d llba=%llx\n", - __func__, rc, verify->last_lba); - return rc; -} - -/** - * decode_ioctl() - translates an encoded ioctl to an easily identifiable string - * @cmd: The ioctl command to decode. - * - * Return: A string identifying the decoded ioctl. - */ -static char *decode_ioctl(unsigned int cmd) -{ - switch (cmd) { - case DK_CXLFLASH_ATTACH: - return __stringify_1(DK_CXLFLASH_ATTACH); - case DK_CXLFLASH_USER_DIRECT: - return __stringify_1(DK_CXLFLASH_USER_DIRECT); - case DK_CXLFLASH_USER_VIRTUAL: - return __stringify_1(DK_CXLFLASH_USER_VIRTUAL); - case DK_CXLFLASH_VLUN_RESIZE: - return __stringify_1(DK_CXLFLASH_VLUN_RESIZE); - case DK_CXLFLASH_RELEASE: - return __stringify_1(DK_CXLFLASH_RELEASE); - case DK_CXLFLASH_DETACH: - return __stringify_1(DK_CXLFLASH_DETACH); - case DK_CXLFLASH_VERIFY: - return __stringify_1(DK_CXLFLASH_VERIFY); - case DK_CXLFLASH_VLUN_CLONE: - return __stringify_1(DK_CXLFLASH_VLUN_CLONE); - case DK_CXLFLASH_RECOVER_AFU: - return __stringify_1(DK_CXLFLASH_RECOVER_AFU); - case DK_CXLFLASH_MANAGE_LUN: - return __stringify_1(DK_CXLFLASH_MANAGE_LUN); - } - - return "UNKNOWN"; -} - -/** - * cxlflash_disk_direct_open() - opens a direct (physical) disk - * @sdev: SCSI device associated with LUN. - * @arg: UDirect ioctl data structure. - * - * On successful return, the user is informed of the resource handle - * to be used to identify the direct lun and the size (in blocks) of - * the direct lun in last LBA format. - * - * Return: 0 on success, -errno on failure - */ -static int cxlflash_disk_direct_open(struct scsi_device *sdev, void *arg) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct dk_cxlflash_release rel = { { 0 }, 0 }; - - struct dk_cxlflash_udirect *pphys = (struct dk_cxlflash_udirect *)arg; - - u64 ctxid = DECODE_CTXID(pphys->context_id), - rctxid = pphys->context_id; - u64 lun_size = 0; - u64 last_lba = 0; - u64 rsrc_handle = -1; - u32 port = CHAN2PORTMASK(sdev->channel); - - int rc = 0; - - struct ctx_info *ctxi = NULL; - struct sisl_rht_entry *rhte = NULL; - - dev_dbg(dev, "%s: ctxid=%llu ls=%llu\n", __func__, ctxid, lun_size); - - rc = cxlflash_lun_attach(gli, MODE_PHYSICAL, false); - if (unlikely(rc)) { - dev_dbg(dev, "%s: Failed attach to LUN (PHYSICAL)\n", __func__); - goto out; - } - - ctxi = get_context(cfg, rctxid, lli, 0); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", __func__, ctxid); - rc = -EINVAL; - goto err1; - } - - rhte = rhte_checkout(ctxi, lli); - if (unlikely(!rhte)) { - dev_dbg(dev, "%s: Too many opens ctxid=%lld\n", - __func__, ctxid); - rc = -EMFILE; /* too many opens */ - goto err1; - } - - rsrc_handle = (rhte - ctxi->rht_start); - - rht_format1(rhte, lli->lun_id[sdev->channel], ctxi->rht_perms, port); - - last_lba = gli->max_lba; - pphys->hdr.return_flags = 0; - pphys->last_lba = last_lba; - pphys->rsrc_handle = rsrc_handle; - - rc = cxlflash_afu_sync(afu, ctxid, rsrc_handle, AFU_LW_SYNC); - if (unlikely(rc)) { - dev_dbg(dev, "%s: AFU sync failed rc=%d\n", __func__, rc); - goto err2; - } - -out: - if (likely(ctxi)) - put_context(ctxi); - dev_dbg(dev, "%s: returning handle=%llu rc=%d llba=%llu\n", - __func__, rsrc_handle, rc, last_lba); - return rc; - -err2: - marshal_udir_to_rele(pphys, &rel); - _cxlflash_disk_release(sdev, ctxi, &rel); - goto out; -err1: - cxlflash_lun_detach(gli); - goto out; -} - -/** - * ioctl_common() - common IOCTL handler for driver - * @sdev: SCSI device associated with LUN. - * @cmd: IOCTL command. - * - * Handles common fencing operations that are valid for multiple ioctls. Always - * allow through ioctls that are cleanup oriented in nature, even when operating - * in a failed/terminating state. - * - * Return: 0 on success, -errno on failure - */ -static int ioctl_common(struct scsi_device *sdev, unsigned int cmd) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - int rc = 0; - - if (unlikely(!lli)) { - dev_dbg(dev, "%s: Unknown LUN\n", __func__); - rc = -EINVAL; - goto out; - } - - rc = check_state(cfg); - if (unlikely(rc) && (cfg->state == STATE_FAILTERM)) { - switch (cmd) { - case DK_CXLFLASH_VLUN_RESIZE: - case DK_CXLFLASH_RELEASE: - case DK_CXLFLASH_DETACH: - dev_dbg(dev, "%s: Command override rc=%d\n", - __func__, rc); - rc = 0; - break; - } - } -out: - return rc; -} - -/** - * cxlflash_ioctl() - IOCTL handler for driver - * @sdev: SCSI device associated with LUN. - * @cmd: IOCTL command. - * @arg: Userspace ioctl data structure. - * - * A read/write semaphore is used to implement a 'drain' of currently - * running ioctls. The read semaphore is taken at the beginning of each - * ioctl thread and released upon concluding execution. Additionally the - * semaphore should be released and then reacquired in any ioctl execution - * path which will wait for an event to occur that is outside the scope of - * the ioctl (i.e. an adapter reset). To drain the ioctls currently running, - * a thread simply needs to acquire the write semaphore. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg) -{ - typedef int (*sioctl) (struct scsi_device *, void *); - - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct afu *afu = cfg->afu; - struct dk_cxlflash_hdr *hdr; - char buf[sizeof(union cxlflash_ioctls)]; - size_t size = 0; - bool known_ioctl = false; - int idx; - int rc = 0; - struct Scsi_Host *shost = sdev->host; - sioctl do_ioctl = NULL; - - static const struct { - size_t size; - sioctl ioctl; - } ioctl_tbl[] = { /* NOTE: order matters here */ - {sizeof(struct dk_cxlflash_attach), (sioctl)cxlflash_disk_attach}, - {sizeof(struct dk_cxlflash_udirect), cxlflash_disk_direct_open}, - {sizeof(struct dk_cxlflash_release), (sioctl)cxlflash_disk_release}, - {sizeof(struct dk_cxlflash_detach), (sioctl)cxlflash_disk_detach}, - {sizeof(struct dk_cxlflash_verify), (sioctl)cxlflash_disk_verify}, - {sizeof(struct dk_cxlflash_recover_afu), (sioctl)cxlflash_afu_recover}, - {sizeof(struct dk_cxlflash_manage_lun), (sioctl)cxlflash_manage_lun}, - {sizeof(struct dk_cxlflash_uvirtual), cxlflash_disk_virtual_open}, - {sizeof(struct dk_cxlflash_resize), (sioctl)cxlflash_vlun_resize}, - {sizeof(struct dk_cxlflash_clone), (sioctl)cxlflash_disk_clone}, - }; - - /* Hold read semaphore so we can drain if needed */ - down_read(&cfg->ioctl_rwsem); - - /* Restrict command set to physical support only for internal LUN */ - if (afu->internal_lun) - switch (cmd) { - case DK_CXLFLASH_RELEASE: - case DK_CXLFLASH_USER_VIRTUAL: - case DK_CXLFLASH_VLUN_RESIZE: - case DK_CXLFLASH_VLUN_CLONE: - dev_dbg(dev, "%s: %s not supported for lun_mode=%d\n", - __func__, decode_ioctl(cmd), afu->internal_lun); - rc = -EINVAL; - goto cxlflash_ioctl_exit; - } - - switch (cmd) { - case DK_CXLFLASH_ATTACH: - case DK_CXLFLASH_USER_DIRECT: - case DK_CXLFLASH_RELEASE: - case DK_CXLFLASH_DETACH: - case DK_CXLFLASH_VERIFY: - case DK_CXLFLASH_RECOVER_AFU: - case DK_CXLFLASH_USER_VIRTUAL: - case DK_CXLFLASH_VLUN_RESIZE: - case DK_CXLFLASH_VLUN_CLONE: - dev_dbg(dev, "%s: %s (%08X) on dev(%d/%d/%d/%llu)\n", - __func__, decode_ioctl(cmd), cmd, shost->host_no, - sdev->channel, sdev->id, sdev->lun); - rc = ioctl_common(sdev, cmd); - if (unlikely(rc)) - goto cxlflash_ioctl_exit; - - fallthrough; - - case DK_CXLFLASH_MANAGE_LUN: - known_ioctl = true; - idx = _IOC_NR(cmd) - _IOC_NR(DK_CXLFLASH_ATTACH); - size = ioctl_tbl[idx].size; - do_ioctl = ioctl_tbl[idx].ioctl; - - if (likely(do_ioctl)) - break; - - fallthrough; - default: - rc = -EINVAL; - goto cxlflash_ioctl_exit; - } - - if (unlikely(copy_from_user(&buf, arg, size))) { - dev_err(dev, "%s: copy_from_user() fail size=%lu cmd=%u (%s) arg=%p\n", - __func__, size, cmd, decode_ioctl(cmd), arg); - rc = -EFAULT; - goto cxlflash_ioctl_exit; - } - - hdr = (struct dk_cxlflash_hdr *)&buf; - if (hdr->version != DK_CXLFLASH_VERSION_0) { - dev_dbg(dev, "%s: Version %u not supported for %s\n", - __func__, hdr->version, decode_ioctl(cmd)); - rc = -EINVAL; - goto cxlflash_ioctl_exit; - } - - if (hdr->rsvd[0] || hdr->rsvd[1] || hdr->rsvd[2] || hdr->return_flags) { - dev_dbg(dev, "%s: Reserved/rflags populated\n", __func__); - rc = -EINVAL; - goto cxlflash_ioctl_exit; - } - - rc = do_ioctl(sdev, (void *)&buf); - if (likely(!rc)) - if (unlikely(copy_to_user(arg, &buf, size))) { - dev_err(dev, "%s: copy_to_user() fail size=%lu cmd=%u (%s) arg=%p\n", - __func__, size, cmd, decode_ioctl(cmd), arg); - rc = -EFAULT; - } - - /* fall through to exit */ - -cxlflash_ioctl_exit: - up_read(&cfg->ioctl_rwsem); - if (unlikely(rc && known_ioctl)) - dev_err(dev, "%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) " - "returned rc %d\n", __func__, - decode_ioctl(cmd), cmd, shost->host_no, - sdev->channel, sdev->id, sdev->lun, rc); - else - dev_dbg(dev, "%s: ioctl %s (%08X) on dev(%d/%d/%d/%llu) " - "returned rc %d\n", __func__, decode_ioctl(cmd), - cmd, shost->host_no, sdev->channel, sdev->id, - sdev->lun, rc); - return rc; -} diff --git a/drivers/scsi/cxlflash/superpipe.h b/drivers/scsi/cxlflash/superpipe.h deleted file mode 100644 index 0e3b45964066..000000000000 --- a/drivers/scsi/cxlflash/superpipe.h +++ /dev/null @@ -1,153 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#ifndef _CXLFLASH_SUPERPIPE_H -#define _CXLFLASH_SUPERPIPE_H - -extern struct cxlflash_global global; - -/* - * Terminology: use afu (and not adapter) to refer to the HW. - * Adapter is the entire slot and includes PSL out of which - * only the AFU is visible to user space. - */ - -/* Chunk size parms: note sislite minimum chunk size is - * 0x10000 LBAs corresponding to a NMASK or 16. - */ -#define MC_CHUNK_SIZE (1 << MC_RHT_NMASK) /* in LBAs */ - -#define CMD_TIMEOUT 30 /* 30 secs */ -#define CMD_RETRIES 5 /* 5 retries for scsi_execute */ - -#define MAX_SECTOR_UNIT 512 /* max_sector is in 512 byte multiples */ - -enum lun_mode { - MODE_NONE = 0, - MODE_VIRTUAL, - MODE_PHYSICAL -}; - -/* Global (entire driver, spans adapters) lun_info structure */ -struct glun_info { - u64 max_lba; /* from read cap(16) */ - u32 blk_len; /* from read cap(16) */ - enum lun_mode mode; /* NONE, VIRTUAL, PHYSICAL */ - int users; /* Number of users w/ references to LUN */ - - u8 wwid[16]; - - struct mutex mutex; - - struct blka blka; - struct list_head list; -}; - -/* Local (per-adapter) lun_info structure */ -struct llun_info { - u64 lun_id[MAX_FC_PORTS]; /* from REPORT_LUNS */ - u32 lun_index; /* Index in the LUN table */ - u32 host_no; /* host_no from Scsi_host */ - u32 port_sel; /* What port to use for this LUN */ - bool in_table; /* Whether a LUN table entry was created */ - - u8 wwid[16]; /* Keep a duplicate copy here? */ - - struct glun_info *parent; /* Pointer to entry in global LUN structure */ - struct scsi_device *sdev; - struct list_head list; -}; - -struct lun_access { - struct llun_info *lli; - struct scsi_device *sdev; - struct list_head list; -}; - -enum ctx_ctrl { - CTX_CTRL_CLONE = (1 << 1), - CTX_CTRL_ERR = (1 << 2), - CTX_CTRL_ERR_FALLBACK = (1 << 3), - CTX_CTRL_NOPID = (1 << 4), - CTX_CTRL_FILE = (1 << 5) -}; - -#define ENCODE_CTXID(_ctx, _id) (((((u64)_ctx) & 0xFFFFFFFF0ULL) << 28) | _id) -#define DECODE_CTXID(_val) (_val & 0xFFFFFFFF) - -struct ctx_info { - struct sisl_ctrl_map __iomem *ctrl_map; /* initialized at startup */ - struct sisl_rht_entry *rht_start; /* 1 page (req'd for alignment), - * alloc/free on attach/detach - */ - u32 rht_out; /* Number of checked out RHT entries */ - u32 rht_perms; /* User-defined permissions for RHT entries */ - struct llun_info **rht_lun; /* Mapping of RHT entries to LUNs */ - u8 *rht_needs_ws; /* User-desired write-same function per RHTE */ - - u64 ctxid; - u64 irqs; /* Number of interrupts requested for context */ - pid_t pid; - bool initialized; - bool unavail; - bool err_recovery_active; - struct mutex mutex; /* Context protection */ - struct kref kref; - void *ctx; - struct cxlflash_cfg *cfg; - struct list_head luns; /* LUNs attached to this context */ - const struct vm_operations_struct *cxl_mmap_vmops; - struct file *file; - struct list_head list; /* Link contexts in error recovery */ -}; - -struct cxlflash_global { - struct mutex mutex; - struct list_head gluns;/* list of glun_info structs */ - struct page *err_page; /* One page of all 0xF for error notification */ -}; - -int cxlflash_vlun_resize(struct scsi_device *sdev, - struct dk_cxlflash_resize *resize); -int _cxlflash_vlun_resize(struct scsi_device *sdev, struct ctx_info *ctxi, - struct dk_cxlflash_resize *resize); - -int cxlflash_disk_release(struct scsi_device *sdev, - struct dk_cxlflash_release *release); -int _cxlflash_disk_release(struct scsi_device *sdev, struct ctx_info *ctxi, - struct dk_cxlflash_release *release); - -int cxlflash_disk_clone(struct scsi_device *sdev, - struct dk_cxlflash_clone *clone); - -int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg); - -int cxlflash_lun_attach(struct glun_info *gli, enum lun_mode mode, bool locked); -void cxlflash_lun_detach(struct glun_info *gli); - -struct ctx_info *get_context(struct cxlflash_cfg *cfg, u64 rctxit, void *arg, - enum ctx_ctrl ctrl); -void put_context(struct ctx_info *ctxi); - -struct sisl_rht_entry *get_rhte(struct ctx_info *ctxi, res_hndl_t rhndl, - struct llun_info *lli); - -struct sisl_rht_entry *rhte_checkout(struct ctx_info *ctxi, - struct llun_info *lli); -void rhte_checkin(struct ctx_info *ctxi, struct sisl_rht_entry *rhte); - -void cxlflash_ba_terminate(struct ba_lun *ba_lun); - -int cxlflash_manage_lun(struct scsi_device *sdev, - struct dk_cxlflash_manage_lun *manage); - -int check_state(struct cxlflash_cfg *cfg); - -#endif /* ifndef _CXLFLASH_SUPERPIPE_H */ diff --git a/drivers/scsi/cxlflash/vlun.c b/drivers/scsi/cxlflash/vlun.c deleted file mode 100644 index cbd5a648a131..000000000000 --- a/drivers/scsi/cxlflash/vlun.c +++ /dev/null @@ -1,1337 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#include <linux/interrupt.h> -#include <linux/pci.h> -#include <linux/syscalls.h> -#include <asm/unaligned.h> -#include <asm/bitsperlong.h> - -#include <scsi/scsi_cmnd.h> -#include <scsi/scsi_host.h> -#include <uapi/scsi/cxlflash_ioctl.h> - -#include "sislite.h" -#include "common.h" -#include "vlun.h" -#include "superpipe.h" - -/** - * marshal_virt_to_resize() - translate uvirtual to resize structure - * @virt: Source structure from which to translate/copy. - * @resize: Destination structure for the translate/copy. - */ -static void marshal_virt_to_resize(struct dk_cxlflash_uvirtual *virt, - struct dk_cxlflash_resize *resize) -{ - resize->hdr = virt->hdr; - resize->context_id = virt->context_id; - resize->rsrc_handle = virt->rsrc_handle; - resize->req_size = virt->lun_size; - resize->last_lba = virt->last_lba; -} - -/** - * marshal_clone_to_rele() - translate clone to release structure - * @clone: Source structure from which to translate/copy. - * @release: Destination structure for the translate/copy. - */ -static void marshal_clone_to_rele(struct dk_cxlflash_clone *clone, - struct dk_cxlflash_release *release) -{ - release->hdr = clone->hdr; - release->context_id = clone->context_id_dst; -} - -/** - * ba_init() - initializes a block allocator - * @ba_lun: Block allocator to initialize. - * - * Return: 0 on success, -errno on failure - */ -static int ba_init(struct ba_lun *ba_lun) -{ - struct ba_lun_info *bali = NULL; - int lun_size_au = 0, i = 0; - int last_word_underflow = 0; - u64 *lam; - - pr_debug("%s: Initializing LUN: lun_id=%016llx " - "ba_lun->lsize=%lx ba_lun->au_size=%lX\n", - __func__, ba_lun->lun_id, ba_lun->lsize, ba_lun->au_size); - - /* Calculate bit map size */ - lun_size_au = ba_lun->lsize / ba_lun->au_size; - if (lun_size_au == 0) { - pr_debug("%s: Requested LUN size of 0!\n", __func__); - return -EINVAL; - } - - /* Allocate lun information container */ - bali = kzalloc(sizeof(struct ba_lun_info), GFP_KERNEL); - if (unlikely(!bali)) { - pr_err("%s: Failed to allocate lun_info lun_id=%016llx\n", - __func__, ba_lun->lun_id); - return -ENOMEM; - } - - bali->total_aus = lun_size_au; - bali->lun_bmap_size = lun_size_au / BITS_PER_LONG; - - if (lun_size_au % BITS_PER_LONG) - bali->lun_bmap_size++; - - /* Allocate bitmap space */ - bali->lun_alloc_map = kzalloc((bali->lun_bmap_size * sizeof(u64)), - GFP_KERNEL); - if (unlikely(!bali->lun_alloc_map)) { - pr_err("%s: Failed to allocate lun allocation map: " - "lun_id=%016llx\n", __func__, ba_lun->lun_id); - kfree(bali); - return -ENOMEM; - } - - /* Initialize the bit map size and set all bits to '1' */ - bali->free_aun_cnt = lun_size_au; - - for (i = 0; i < bali->lun_bmap_size; i++) - bali->lun_alloc_map[i] = 0xFFFFFFFFFFFFFFFFULL; - - /* If the last word not fully utilized, mark extra bits as allocated */ - last_word_underflow = (bali->lun_bmap_size * BITS_PER_LONG); - last_word_underflow -= bali->free_aun_cnt; - if (last_word_underflow > 0) { - lam = &bali->lun_alloc_map[bali->lun_bmap_size - 1]; - for (i = (HIBIT - last_word_underflow + 1); - i < BITS_PER_LONG; - i++) - clear_bit(i, (ulong *)lam); - } - - /* Initialize high elevator index, low/curr already at 0 from kzalloc */ - bali->free_high_idx = bali->lun_bmap_size; - - /* Allocate clone map */ - bali->aun_clone_map = kzalloc((bali->total_aus * sizeof(u8)), - GFP_KERNEL); - if (unlikely(!bali->aun_clone_map)) { - pr_err("%s: Failed to allocate clone map: lun_id=%016llx\n", - __func__, ba_lun->lun_id); - kfree(bali->lun_alloc_map); - kfree(bali); - return -ENOMEM; - } - - /* Pass the allocated LUN info as a handle to the user */ - ba_lun->ba_lun_handle = bali; - - pr_debug("%s: Successfully initialized the LUN: " - "lun_id=%016llx bitmap size=%x, free_aun_cnt=%llx\n", - __func__, ba_lun->lun_id, bali->lun_bmap_size, - bali->free_aun_cnt); - return 0; -} - -/** - * find_free_range() - locates a free bit within the block allocator - * @low: First word in block allocator to start search. - * @high: Last word in block allocator to search. - * @bali: LUN information structure owning the block allocator to search. - * @bit_word: Passes back the word in the block allocator owning the free bit. - * - * Return: The bit position within the passed back word, -1 on failure - */ -static int find_free_range(u32 low, - u32 high, - struct ba_lun_info *bali, int *bit_word) -{ - int i; - u64 bit_pos = -1; - ulong *lam, num_bits; - - for (i = low; i < high; i++) - if (bali->lun_alloc_map[i] != 0) { - lam = (ulong *)&bali->lun_alloc_map[i]; - num_bits = (sizeof(*lam) * BITS_PER_BYTE); - bit_pos = find_first_bit(lam, num_bits); - - pr_devel("%s: Found free bit %llu in LUN " - "map entry %016llx at bitmap index = %d\n", - __func__, bit_pos, bali->lun_alloc_map[i], i); - - *bit_word = i; - bali->free_aun_cnt--; - clear_bit(bit_pos, lam); - break; - } - - return bit_pos; -} - -/** - * ba_alloc() - allocates a block from the block allocator - * @ba_lun: Block allocator from which to allocate a block. - * - * Return: The allocated block, -1 on failure - */ -static u64 ba_alloc(struct ba_lun *ba_lun) -{ - u64 bit_pos = -1; - int bit_word = 0; - struct ba_lun_info *bali = NULL; - - bali = ba_lun->ba_lun_handle; - - pr_debug("%s: Received block allocation request: " - "lun_id=%016llx free_aun_cnt=%llx\n", - __func__, ba_lun->lun_id, bali->free_aun_cnt); - - if (bali->free_aun_cnt == 0) { - pr_debug("%s: No space left on LUN: lun_id=%016llx\n", - __func__, ba_lun->lun_id); - return -1ULL; - } - - /* Search to find a free entry, curr->high then low->curr */ - bit_pos = find_free_range(bali->free_curr_idx, - bali->free_high_idx, bali, &bit_word); - if (bit_pos == -1) { - bit_pos = find_free_range(bali->free_low_idx, - bali->free_curr_idx, - bali, &bit_word); - if (bit_pos == -1) { - pr_debug("%s: Could not find an allocation unit on LUN:" - " lun_id=%016llx\n", __func__, ba_lun->lun_id); - return -1ULL; - } - } - - /* Update the free_curr_idx */ - if (bit_pos == HIBIT) - bali->free_curr_idx = bit_word + 1; - else - bali->free_curr_idx = bit_word; - - pr_debug("%s: Allocating AU number=%llx lun_id=%016llx " - "free_aun_cnt=%llx\n", __func__, - ((bit_word * BITS_PER_LONG) + bit_pos), ba_lun->lun_id, - bali->free_aun_cnt); - - return (u64) ((bit_word * BITS_PER_LONG) + bit_pos); -} - -/** - * validate_alloc() - validates the specified block has been allocated - * @bali: LUN info owning the block allocator. - * @aun: Block to validate. - * - * Return: 0 on success, -1 on failure - */ -static int validate_alloc(struct ba_lun_info *bali, u64 aun) -{ - int idx = 0, bit_pos = 0; - - idx = aun / BITS_PER_LONG; - bit_pos = aun % BITS_PER_LONG; - - if (test_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx])) - return -1; - - return 0; -} - -/** - * ba_free() - frees a block from the block allocator - * @ba_lun: Block allocator from which to allocate a block. - * @to_free: Block to free. - * - * Return: 0 on success, -1 on failure - */ -static int ba_free(struct ba_lun *ba_lun, u64 to_free) -{ - int idx = 0, bit_pos = 0; - struct ba_lun_info *bali = NULL; - - bali = ba_lun->ba_lun_handle; - - if (validate_alloc(bali, to_free)) { - pr_debug("%s: AUN %llx is not allocated on lun_id=%016llx\n", - __func__, to_free, ba_lun->lun_id); - return -1; - } - - pr_debug("%s: Received a request to free AU=%llx lun_id=%016llx " - "free_aun_cnt=%llx\n", __func__, to_free, ba_lun->lun_id, - bali->free_aun_cnt); - - if (bali->aun_clone_map[to_free] > 0) { - pr_debug("%s: AUN %llx lun_id=%016llx cloned. Clone count=%x\n", - __func__, to_free, ba_lun->lun_id, - bali->aun_clone_map[to_free]); - bali->aun_clone_map[to_free]--; - return 0; - } - - idx = to_free / BITS_PER_LONG; - bit_pos = to_free % BITS_PER_LONG; - - set_bit(bit_pos, (ulong *)&bali->lun_alloc_map[idx]); - bali->free_aun_cnt++; - - if (idx < bali->free_low_idx) - bali->free_low_idx = idx; - else if (idx > bali->free_high_idx) - bali->free_high_idx = idx; - - pr_debug("%s: Successfully freed AU bit_pos=%x bit map index=%x " - "lun_id=%016llx free_aun_cnt=%llx\n", __func__, bit_pos, idx, - ba_lun->lun_id, bali->free_aun_cnt); - - return 0; -} - -/** - * ba_clone() - Clone a chunk of the block allocation table - * @ba_lun: Block allocator from which to allocate a block. - * @to_clone: Block to clone. - * - * Return: 0 on success, -1 on failure - */ -static int ba_clone(struct ba_lun *ba_lun, u64 to_clone) -{ - struct ba_lun_info *bali = ba_lun->ba_lun_handle; - - if (validate_alloc(bali, to_clone)) { - pr_debug("%s: AUN=%llx not allocated on lun_id=%016llx\n", - __func__, to_clone, ba_lun->lun_id); - return -1; - } - - pr_debug("%s: Received a request to clone AUN %llx on lun_id=%016llx\n", - __func__, to_clone, ba_lun->lun_id); - - if (bali->aun_clone_map[to_clone] == MAX_AUN_CLONE_CNT) { - pr_debug("%s: AUN %llx on lun_id=%016llx hit max clones already\n", - __func__, to_clone, ba_lun->lun_id); - return -1; - } - - bali->aun_clone_map[to_clone]++; - - return 0; -} - -/** - * ba_space() - returns the amount of free space left in the block allocator - * @ba_lun: Block allocator. - * - * Return: Amount of free space in block allocator - */ -static u64 ba_space(struct ba_lun *ba_lun) -{ - struct ba_lun_info *bali = ba_lun->ba_lun_handle; - - return bali->free_aun_cnt; -} - -/** - * cxlflash_ba_terminate() - frees resources associated with the block allocator - * @ba_lun: Block allocator. - * - * Safe to call in a partially allocated state. - */ -void cxlflash_ba_terminate(struct ba_lun *ba_lun) -{ - struct ba_lun_info *bali = ba_lun->ba_lun_handle; - - if (bali) { - kfree(bali->aun_clone_map); - kfree(bali->lun_alloc_map); - kfree(bali); - ba_lun->ba_lun_handle = NULL; - } -} - -/** - * init_vlun() - initializes a LUN for virtual use - * @lli: LUN information structure that owns the block allocator. - * - * Return: 0 on success, -errno on failure - */ -static int init_vlun(struct llun_info *lli) -{ - int rc = 0; - struct glun_info *gli = lli->parent; - struct blka *blka = &gli->blka; - - memset(blka, 0, sizeof(*blka)); - mutex_init(&blka->mutex); - - /* LUN IDs are unique per port, save the index instead */ - blka->ba_lun.lun_id = lli->lun_index; - blka->ba_lun.lsize = gli->max_lba + 1; - blka->ba_lun.lba_size = gli->blk_len; - - blka->ba_lun.au_size = MC_CHUNK_SIZE; - blka->nchunk = blka->ba_lun.lsize / MC_CHUNK_SIZE; - - rc = ba_init(&blka->ba_lun); - if (unlikely(rc)) - pr_debug("%s: cannot init block_alloc, rc=%d\n", __func__, rc); - - pr_debug("%s: returning rc=%d lli=%p\n", __func__, rc, lli); - return rc; -} - -/** - * write_same16() - sends a SCSI WRITE_SAME16 (0) command to specified LUN - * @sdev: SCSI device associated with LUN. - * @lba: Logical block address to start write same. - * @nblks: Number of logical blocks to write same. - * - * The SCSI WRITE_SAME16 can take quite a while to complete. Should an EEH occur - * while in scsi_execute_cmd(), the EEH handler will attempt to recover. As - * part of the recovery, the handler drains all currently running ioctls, - * waiting until they have completed before proceeding with a reset. As this - * routine is used on the ioctl path, this can create a condition where the - * EEH handler becomes stuck, infinitely waiting for this ioctl thread. To - * avoid this behavior, temporarily unmark this thread as an ioctl thread by - * releasing the ioctl read semaphore. This will allow the EEH handler to - * proceed with a recovery while this thread is still running. Once the - * scsi_execute_cmd() returns, reacquire the ioctl read semaphore and check the - * adapter state in case it changed while inside of scsi_execute_cmd(). The - * state check will wait if the adapter is still being recovered or return a - * failure if the recovery failed. In the event that the adapter reset failed, - * simply return the failure as the ioctl would be unable to continue. - * - * Note that the above puts a requirement on this routine to only be called on - * an ioctl thread. - * - * Return: 0 on success, -errno on failure - */ -static int write_same16(struct scsi_device *sdev, - u64 lba, - u32 nblks) -{ - u8 *cmd_buf = NULL; - u8 *scsi_cmd = NULL; - int rc = 0; - int result = 0; - u64 offset = lba; - int left = nblks; - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - const u32 s = ilog2(sdev->sector_size) - 9; - const u32 to = sdev->request_queue->rq_timeout; - const u32 ws_limit = - sdev->request_queue->limits.max_write_zeroes_sectors >> s; - - cmd_buf = kzalloc(CMD_BUFSIZE, GFP_KERNEL); - scsi_cmd = kzalloc(MAX_COMMAND_SIZE, GFP_KERNEL); - if (unlikely(!cmd_buf || !scsi_cmd)) { - rc = -ENOMEM; - goto out; - } - - while (left > 0) { - - scsi_cmd[0] = WRITE_SAME_16; - scsi_cmd[1] = cfg->ws_unmap ? 0x8 : 0; - put_unaligned_be64(offset, &scsi_cmd[2]); - put_unaligned_be32(ws_limit < left ? ws_limit : left, - &scsi_cmd[10]); - - /* Drop the ioctl read semaphore across lengthy call */ - up_read(&cfg->ioctl_rwsem); - result = scsi_execute_cmd(sdev, scsi_cmd, REQ_OP_DRV_OUT, - cmd_buf, CMD_BUFSIZE, to, - CMD_RETRIES, NULL); - down_read(&cfg->ioctl_rwsem); - rc = check_state(cfg); - if (rc) { - dev_err(dev, "%s: Failed state result=%08x\n", - __func__, result); - rc = -ENODEV; - goto out; - } - - if (result) { - dev_err_ratelimited(dev, "%s: command failed for " - "offset=%lld result=%08x\n", - __func__, offset, result); - rc = -EIO; - goto out; - } - left -= ws_limit; - offset += ws_limit; - } - -out: - kfree(cmd_buf); - kfree(scsi_cmd); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * grow_lxt() - expands the translation table associated with the specified RHTE - * @afu: AFU associated with the host. - * @sdev: SCSI device associated with LUN. - * @ctxid: Context ID of context owning the RHTE. - * @rhndl: Resource handle associated with the RHTE. - * @rhte: Resource handle entry (RHTE). - * @new_size: Number of translation entries associated with RHTE. - * - * By design, this routine employs a 'best attempt' allocation and will - * truncate the requested size down if there is not sufficient space in - * the block allocator to satisfy the request but there does exist some - * amount of space. The user is made aware of this by returning the size - * allocated. - * - * Return: 0 on success, -errno on failure - */ -static int grow_lxt(struct afu *afu, - struct scsi_device *sdev, - ctx_hndl_t ctxid, - res_hndl_t rhndl, - struct sisl_rht_entry *rhte, - u64 *new_size) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct sisl_lxt_entry *lxt = NULL, *lxt_old = NULL; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct blka *blka = &gli->blka; - u32 av_size; - u32 ngrps, ngrps_old; - u64 aun; /* chunk# allocated by block allocator */ - u64 delta = *new_size - rhte->lxt_cnt; - u64 my_new_size; - int i, rc = 0; - - /* - * Check what is available in the block allocator before re-allocating - * LXT array. This is done up front under the mutex which must not be - * released until after allocation is complete. - */ - mutex_lock(&blka->mutex); - av_size = ba_space(&blka->ba_lun); - if (unlikely(av_size <= 0)) { - dev_dbg(dev, "%s: ba_space error av_size=%d\n", - __func__, av_size); - mutex_unlock(&blka->mutex); - rc = -ENOSPC; - goto out; - } - - if (av_size < delta) - delta = av_size; - - lxt_old = rhte->lxt_start; - ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); - ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt + delta); - - if (ngrps != ngrps_old) { - /* reallocate to fit new size */ - lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), - GFP_KERNEL); - if (unlikely(!lxt)) { - mutex_unlock(&blka->mutex); - rc = -ENOMEM; - goto out; - } - - /* copy over all old entries */ - memcpy(lxt, lxt_old, (sizeof(*lxt) * rhte->lxt_cnt)); - } else - lxt = lxt_old; - - /* nothing can fail from now on */ - my_new_size = rhte->lxt_cnt + delta; - - /* add new entries to the end */ - for (i = rhte->lxt_cnt; i < my_new_size; i++) { - /* - * Due to the earlier check of available space, ba_alloc - * cannot fail here. If it did due to internal error, - * leave a rlba_base of -1u which will likely be a - * invalid LUN (too large). - */ - aun = ba_alloc(&blka->ba_lun); - if ((aun == -1ULL) || (aun >= blka->nchunk)) - dev_dbg(dev, "%s: ba_alloc error allocated chunk=%llu " - "max=%llu\n", __func__, aun, blka->nchunk - 1); - - /* select both ports, use r/w perms from RHT */ - lxt[i].rlba_base = ((aun << MC_CHUNK_SHIFT) | - (lli->lun_index << LXT_LUNIDX_SHIFT) | - (RHT_PERM_RW << LXT_PERM_SHIFT | - lli->port_sel)); - } - - mutex_unlock(&blka->mutex); - - /* - * The following sequence is prescribed in the SISlite spec - * for syncing up with the AFU when adding LXT entries. - */ - dma_wmb(); /* Make LXT updates are visible */ - - rhte->lxt_start = lxt; - dma_wmb(); /* Make RHT entry's LXT table update visible */ - - rhte->lxt_cnt = my_new_size; - dma_wmb(); /* Make RHT entry's LXT table size update visible */ - - rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); - if (unlikely(rc)) - rc = -EAGAIN; - - /* free old lxt if reallocated */ - if (lxt != lxt_old) - kfree(lxt_old); - *new_size = my_new_size; -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * shrink_lxt() - reduces translation table associated with the specified RHTE - * @afu: AFU associated with the host. - * @sdev: SCSI device associated with LUN. - * @rhndl: Resource handle associated with the RHTE. - * @rhte: Resource handle entry (RHTE). - * @ctxi: Context owning resources. - * @new_size: Number of translation entries associated with RHTE. - * - * Return: 0 on success, -errno on failure - */ -static int shrink_lxt(struct afu *afu, - struct scsi_device *sdev, - res_hndl_t rhndl, - struct sisl_rht_entry *rhte, - struct ctx_info *ctxi, - u64 *new_size) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct sisl_lxt_entry *lxt, *lxt_old; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct blka *blka = &gli->blka; - ctx_hndl_t ctxid = DECODE_CTXID(ctxi->ctxid); - bool needs_ws = ctxi->rht_needs_ws[rhndl]; - bool needs_sync = !ctxi->err_recovery_active; - u32 ngrps, ngrps_old; - u64 aun; /* chunk# allocated by block allocator */ - u64 delta = rhte->lxt_cnt - *new_size; - u64 my_new_size; - int i, rc = 0; - - lxt_old = rhte->lxt_start; - ngrps_old = LXT_NUM_GROUPS(rhte->lxt_cnt); - ngrps = LXT_NUM_GROUPS(rhte->lxt_cnt - delta); - - if (ngrps != ngrps_old) { - /* Reallocate to fit new size unless new size is 0 */ - if (ngrps) { - lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), - GFP_KERNEL); - if (unlikely(!lxt)) { - rc = -ENOMEM; - goto out; - } - - /* Copy over old entries that will remain */ - memcpy(lxt, lxt_old, - (sizeof(*lxt) * (rhte->lxt_cnt - delta))); - } else - lxt = NULL; - } else - lxt = lxt_old; - - /* Nothing can fail from now on */ - my_new_size = rhte->lxt_cnt - delta; - - /* - * The following sequence is prescribed in the SISlite spec - * for syncing up with the AFU when removing LXT entries. - */ - rhte->lxt_cnt = my_new_size; - dma_wmb(); /* Make RHT entry's LXT table size update visible */ - - rhte->lxt_start = lxt; - dma_wmb(); /* Make RHT entry's LXT table update visible */ - - if (needs_sync) { - rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); - if (unlikely(rc)) - rc = -EAGAIN; - } - - if (needs_ws) { - /* - * Mark the context as unavailable, so that we can release - * the mutex safely. - */ - ctxi->unavail = true; - mutex_unlock(&ctxi->mutex); - } - - /* Free LBAs allocated to freed chunks */ - mutex_lock(&blka->mutex); - for (i = delta - 1; i >= 0; i--) { - aun = lxt_old[my_new_size + i].rlba_base >> MC_CHUNK_SHIFT; - if (needs_ws) - write_same16(sdev, aun, MC_CHUNK_SIZE); - ba_free(&blka->ba_lun, aun); - } - mutex_unlock(&blka->mutex); - - if (needs_ws) { - /* Make the context visible again */ - mutex_lock(&ctxi->mutex); - ctxi->unavail = false; - } - - /* Free old lxt if reallocated */ - if (lxt != lxt_old) - kfree(lxt_old); - *new_size = my_new_size; -out: - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * _cxlflash_vlun_resize() - changes the size of a virtual LUN - * @sdev: SCSI device associated with LUN owning virtual LUN. - * @ctxi: Context owning resources. - * @resize: Resize ioctl data structure. - * - * On successful return, the user is informed of the new size (in blocks) - * of the virtual LUN in last LBA format. When the size of the virtual - * LUN is zero, the last LBA is reflected as -1. See comment in the - * prologue for _cxlflash_disk_release() regarding AFU syncs and contexts - * on the error recovery list. - * - * Return: 0 on success, -errno on failure - */ -int _cxlflash_vlun_resize(struct scsi_device *sdev, - struct ctx_info *ctxi, - struct dk_cxlflash_resize *resize) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct afu *afu = cfg->afu; - bool put_ctx = false; - - res_hndl_t rhndl = resize->rsrc_handle; - u64 new_size; - u64 nsectors; - u64 ctxid = DECODE_CTXID(resize->context_id), - rctxid = resize->context_id; - - struct sisl_rht_entry *rhte; - - int rc = 0; - - /* - * The requested size (req_size) is always assumed to be in 4k blocks, - * so we have to convert it here from 4k to chunk size. - */ - nsectors = (resize->req_size * CXLFLASH_BLOCK_SIZE) / gli->blk_len; - new_size = DIV_ROUND_UP(nsectors, MC_CHUNK_SIZE); - - dev_dbg(dev, "%s: ctxid=%llu rhndl=%llu req_size=%llu new_size=%llu\n", - __func__, ctxid, resize->rsrc_handle, resize->req_size, - new_size); - - if (unlikely(gli->mode != MODE_VIRTUAL)) { - dev_dbg(dev, "%s: LUN mode does not support resize mode=%d\n", - __func__, gli->mode); - rc = -EINVAL; - goto out; - - } - - if (!ctxi) { - ctxi = get_context(cfg, rctxid, lli, CTX_CTRL_ERR_FALLBACK); - if (unlikely(!ctxi)) { - dev_dbg(dev, "%s: Bad context ctxid=%llu\n", - __func__, ctxid); - rc = -EINVAL; - goto out; - } - - put_ctx = true; - } - - rhte = get_rhte(ctxi, rhndl, lli); - if (unlikely(!rhte)) { - dev_dbg(dev, "%s: Bad resource handle rhndl=%u\n", - __func__, rhndl); - rc = -EINVAL; - goto out; - } - - if (new_size > rhte->lxt_cnt) - rc = grow_lxt(afu, sdev, ctxid, rhndl, rhte, &new_size); - else if (new_size < rhte->lxt_cnt) - rc = shrink_lxt(afu, sdev, rhndl, rhte, ctxi, &new_size); - else { - /* - * Rare case where there is already sufficient space, just - * need to perform a translation sync with the AFU. This - * scenario likely follows a previous sync failure during - * a resize operation. Accordingly, perform the heavyweight - * form of translation sync as it is unknown which type of - * resize failed previously. - */ - rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_HW_SYNC); - if (unlikely(rc)) { - rc = -EAGAIN; - goto out; - } - } - - resize->hdr.return_flags = 0; - resize->last_lba = (new_size * MC_CHUNK_SIZE * gli->blk_len); - resize->last_lba /= CXLFLASH_BLOCK_SIZE; - resize->last_lba--; - -out: - if (put_ctx) - put_context(ctxi); - dev_dbg(dev, "%s: resized to %llu returning rc=%d\n", - __func__, resize->last_lba, rc); - return rc; -} - -int cxlflash_vlun_resize(struct scsi_device *sdev, - struct dk_cxlflash_resize *resize) -{ - return _cxlflash_vlun_resize(sdev, NULL, resize); -} - -/** - * cxlflash_restore_luntable() - Restore LUN table to prior state - * @cfg: Internal structure associated with the host. - */ -void cxlflash_restore_luntable(struct cxlflash_cfg *cfg) -{ - struct llun_info *lli, *temp; - u32 lind; - int k; - struct device *dev = &cfg->dev->dev; - __be64 __iomem *fc_port_luns; - - mutex_lock(&global.mutex); - - list_for_each_entry_safe(lli, temp, &cfg->lluns, list) { - if (!lli->in_table) - continue; - - lind = lli->lun_index; - dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind); - - for (k = 0; k < cfg->num_fc_ports; k++) - if (lli->port_sel & (1 << k)) { - fc_port_luns = get_fc_port_luns(cfg, k); - writeq_be(lli->lun_id[k], &fc_port_luns[lind]); - dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]); - } - } - - mutex_unlock(&global.mutex); -} - -/** - * get_num_ports() - compute number of ports from port selection mask - * @psm: Port selection mask. - * - * Return: Population count of port selection mask - */ -static inline u8 get_num_ports(u32 psm) -{ - static const u8 bits[16] = { 0, 1, 1, 2, 1, 2, 2, 3, - 1, 2, 2, 3, 2, 3, 3, 4 }; - - return bits[psm & 0xf]; -} - -/** - * init_luntable() - write an entry in the LUN table - * @cfg: Internal structure associated with the host. - * @lli: Per adapter LUN information structure. - * - * On successful return, a LUN table entry is created: - * - at the top for LUNs visible on multiple ports. - * - at the bottom for LUNs visible only on one port. - * - * Return: 0 on success, -errno on failure - */ -static int init_luntable(struct cxlflash_cfg *cfg, struct llun_info *lli) -{ - u32 chan; - u32 lind; - u32 nports; - int rc = 0; - int k; - struct device *dev = &cfg->dev->dev; - __be64 __iomem *fc_port_luns; - - mutex_lock(&global.mutex); - - if (lli->in_table) - goto out; - - nports = get_num_ports(lli->port_sel); - if (nports == 0 || nports > cfg->num_fc_ports) { - WARN(1, "Unsupported port configuration nports=%u", nports); - rc = -EIO; - goto out; - } - - if (nports > 1) { - /* - * When LUN is visible from multiple ports, we will put - * it in the top half of the LUN table. - */ - for (k = 0; k < cfg->num_fc_ports; k++) { - if (!(lli->port_sel & (1 << k))) - continue; - - if (cfg->promote_lun_index == cfg->last_lun_index[k]) { - rc = -ENOSPC; - goto out; - } - } - - lind = lli->lun_index = cfg->promote_lun_index; - dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n", __func__, lind); - - for (k = 0; k < cfg->num_fc_ports; k++) { - if (!(lli->port_sel & (1 << k))) - continue; - - fc_port_luns = get_fc_port_luns(cfg, k); - writeq_be(lli->lun_id[k], &fc_port_luns[lind]); - dev_dbg(dev, "\t%d=%llx\n", k, lli->lun_id[k]); - } - - cfg->promote_lun_index++; - } else { - /* - * When LUN is visible only from one port, we will put - * it in the bottom half of the LUN table. - */ - chan = PORTMASK2CHAN(lli->port_sel); - if (cfg->promote_lun_index == cfg->last_lun_index[chan]) { - rc = -ENOSPC; - goto out; - } - - lind = lli->lun_index = cfg->last_lun_index[chan]; - fc_port_luns = get_fc_port_luns(cfg, chan); - writeq_be(lli->lun_id[chan], &fc_port_luns[lind]); - cfg->last_lun_index[chan]--; - dev_dbg(dev, "%s: Virtual LUNs on slot %d:\n\t%d=%llx\n", - __func__, lind, chan, lli->lun_id[chan]); - } - - lli->in_table = true; -out: - mutex_unlock(&global.mutex); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -} - -/** - * cxlflash_disk_virtual_open() - open a virtual disk of specified size - * @sdev: SCSI device associated with LUN owning virtual LUN. - * @arg: UVirtual ioctl data structure. - * - * On successful return, the user is informed of the resource handle - * to be used to identify the virtual LUN and the size (in blocks) of - * the virtual LUN in last LBA format. When the size of the virtual LUN - * is zero, the last LBA is reflected as -1. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - - struct dk_cxlflash_uvirtual *virt = (struct dk_cxlflash_uvirtual *)arg; - struct dk_cxlflash_resize resize; - - u64 ctxid = DECODE_CTXID(virt->context_id), - rctxid = virt->context_id; - u64 lun_size = virt->lun_size; - u64 last_lba = 0; - u64 rsrc_handle = -1; - - int rc = 0; - - struct ctx_info *ctxi = NULL; - struct sisl_rht_entry *rhte = NULL; - - dev_dbg(dev, "%s: ctxid=%llu ls=%llu\n", __func__, ctxid, lun_size); - - /* Setup the LUNs block allocator on first call */ - mutex_lock(&gli->mutex); - if (gli->mode == MODE_NONE) { - rc = init_vlun(lli); - if (rc) { - dev_err(dev, "%s: init_vlun failed rc=%d\n", - __func__, rc); - rc = -ENOMEM; - goto err0; - } - } - - rc = cxlflash_lun_attach(gli, MODE_VIRTUAL, true); - if (unlikely(rc)) { - dev_err(dev, "%s: Failed attach to LUN (VIRTUAL)\n", __func__); - goto err0; - } - mutex_unlock(&gli->mutex); - - rc = init_luntable(cfg, lli); - if (rc) { - dev_err(dev, "%s: init_luntable failed rc=%d\n", __func__, rc); - goto err1; - } - - ctxi = get_context(cfg, rctxid, lli, 0); - if (unlikely(!ctxi)) { - dev_err(dev, "%s: Bad context ctxid=%llu\n", __func__, ctxid); - rc = -EINVAL; - goto err1; - } - - rhte = rhte_checkout(ctxi, lli); - if (unlikely(!rhte)) { - dev_err(dev, "%s: too many opens ctxid=%llu\n", - __func__, ctxid); - rc = -EMFILE; /* too many opens */ - goto err1; - } - - rsrc_handle = (rhte - ctxi->rht_start); - - /* Populate RHT format 0 */ - rhte->nmask = MC_RHT_NMASK; - rhte->fp = SISL_RHT_FP(0U, ctxi->rht_perms); - - /* Resize even if requested size is 0 */ - marshal_virt_to_resize(virt, &resize); - resize.rsrc_handle = rsrc_handle; - rc = _cxlflash_vlun_resize(sdev, ctxi, &resize); - if (rc) { - dev_err(dev, "%s: resize failed rc=%d\n", __func__, rc); - goto err2; - } - last_lba = resize.last_lba; - - if (virt->hdr.flags & DK_CXLFLASH_UVIRTUAL_NEED_WRITE_SAME) - ctxi->rht_needs_ws[rsrc_handle] = true; - - virt->hdr.return_flags = 0; - virt->last_lba = last_lba; - virt->rsrc_handle = rsrc_handle; - - if (get_num_ports(lli->port_sel) > 1) - virt->hdr.return_flags |= DK_CXLFLASH_ALL_PORTS_ACTIVE; -out: - if (likely(ctxi)) - put_context(ctxi); - dev_dbg(dev, "%s: returning handle=%llu rc=%d llba=%llu\n", - __func__, rsrc_handle, rc, last_lba); - return rc; - -err2: - rhte_checkin(ctxi, rhte); -err1: - cxlflash_lun_detach(gli); - goto out; -err0: - /* Special common cleanup prior to successful LUN attach */ - cxlflash_ba_terminate(&gli->blka.ba_lun); - mutex_unlock(&gli->mutex); - goto out; -} - -/** - * clone_lxt() - copies translation tables from source to destination RHTE - * @afu: AFU associated with the host. - * @blka: Block allocator associated with LUN. - * @ctxid: Context ID of context owning the RHTE. - * @rhndl: Resource handle associated with the RHTE. - * @rhte: Destination resource handle entry (RHTE). - * @rhte_src: Source resource handle entry (RHTE). - * - * Return: 0 on success, -errno on failure - */ -static int clone_lxt(struct afu *afu, - struct blka *blka, - ctx_hndl_t ctxid, - res_hndl_t rhndl, - struct sisl_rht_entry *rhte, - struct sisl_rht_entry *rhte_src) -{ - struct cxlflash_cfg *cfg = afu->parent; - struct device *dev = &cfg->dev->dev; - struct sisl_lxt_entry *lxt = NULL; - bool locked = false; - u32 ngrps; - u64 aun; /* chunk# allocated by block allocator */ - int j; - int i = 0; - int rc = 0; - - ngrps = LXT_NUM_GROUPS(rhte_src->lxt_cnt); - - if (ngrps) { - /* allocate new LXTs for clone */ - lxt = kzalloc((sizeof(*lxt) * LXT_GROUP_SIZE * ngrps), - GFP_KERNEL); - if (unlikely(!lxt)) { - rc = -ENOMEM; - goto out; - } - - /* copy over */ - memcpy(lxt, rhte_src->lxt_start, - (sizeof(*lxt) * rhte_src->lxt_cnt)); - - /* clone the LBAs in block allocator via ref_cnt, note that the - * block allocator mutex must be held until it is established - * that this routine will complete without the need for a - * cleanup. - */ - mutex_lock(&blka->mutex); - locked = true; - for (i = 0; i < rhte_src->lxt_cnt; i++) { - aun = (lxt[i].rlba_base >> MC_CHUNK_SHIFT); - if (ba_clone(&blka->ba_lun, aun) == -1ULL) { - rc = -EIO; - goto err; - } - } - } - - /* - * The following sequence is prescribed in the SISlite spec - * for syncing up with the AFU when adding LXT entries. - */ - dma_wmb(); /* Make LXT updates are visible */ - - rhte->lxt_start = lxt; - dma_wmb(); /* Make RHT entry's LXT table update visible */ - - rhte->lxt_cnt = rhte_src->lxt_cnt; - dma_wmb(); /* Make RHT entry's LXT table size update visible */ - - rc = cxlflash_afu_sync(afu, ctxid, rhndl, AFU_LW_SYNC); - if (unlikely(rc)) { - rc = -EAGAIN; - goto err2; - } - -out: - if (locked) - mutex_unlock(&blka->mutex); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; -err2: - /* Reset the RHTE */ - rhte->lxt_cnt = 0; - dma_wmb(); - rhte->lxt_start = NULL; - dma_wmb(); -err: - /* free the clones already made */ - for (j = 0; j < i; j++) { - aun = (lxt[j].rlba_base >> MC_CHUNK_SHIFT); - ba_free(&blka->ba_lun, aun); - } - kfree(lxt); - goto out; -} - -/** - * cxlflash_disk_clone() - clone a context by making snapshot of another - * @sdev: SCSI device associated with LUN owning virtual LUN. - * @clone: Clone ioctl data structure. - * - * This routine effectively performs cxlflash_disk_open operation for each - * in-use virtual resource in the source context. Note that the destination - * context must be in pristine state and cannot have any resource handles - * open at the time of the clone. - * - * Return: 0 on success, -errno on failure - */ -int cxlflash_disk_clone(struct scsi_device *sdev, - struct dk_cxlflash_clone *clone) -{ - struct cxlflash_cfg *cfg = shost_priv(sdev->host); - struct device *dev = &cfg->dev->dev; - struct llun_info *lli = sdev->hostdata; - struct glun_info *gli = lli->parent; - struct blka *blka = &gli->blka; - struct afu *afu = cfg->afu; - struct dk_cxlflash_release release = { { 0 }, 0 }; - - struct ctx_info *ctxi_src = NULL, - *ctxi_dst = NULL; - struct lun_access *lun_access_src, *lun_access_dst; - u32 perms; - u64 ctxid_src = DECODE_CTXID(clone->context_id_src), - ctxid_dst = DECODE_CTXID(clone->context_id_dst), - rctxid_src = clone->context_id_src, - rctxid_dst = clone->context_id_dst; - int i, j; - int rc = 0; - bool found; - LIST_HEAD(sidecar); - - dev_dbg(dev, "%s: ctxid_src=%llu ctxid_dst=%llu\n", - __func__, ctxid_src, ctxid_dst); - - /* Do not clone yourself */ - if (unlikely(rctxid_src == rctxid_dst)) { - rc = -EINVAL; - goto out; - } - - if (unlikely(gli->mode != MODE_VIRTUAL)) { - rc = -EINVAL; - dev_dbg(dev, "%s: Only supported on virtual LUNs mode=%u\n", - __func__, gli->mode); - goto out; - } - - ctxi_src = get_context(cfg, rctxid_src, lli, CTX_CTRL_CLONE); - ctxi_dst = get_context(cfg, rctxid_dst, lli, 0); - if (unlikely(!ctxi_src || !ctxi_dst)) { - dev_dbg(dev, "%s: Bad context ctxid_src=%llu ctxid_dst=%llu\n", - __func__, ctxid_src, ctxid_dst); - rc = -EINVAL; - goto out; - } - - /* Verify there is no open resource handle in the destination context */ - for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) - if (ctxi_dst->rht_start[i].nmask != 0) { - rc = -EINVAL; - goto out; - } - - /* Clone LUN access list */ - list_for_each_entry(lun_access_src, &ctxi_src->luns, list) { - found = false; - list_for_each_entry(lun_access_dst, &ctxi_dst->luns, list) - if (lun_access_dst->sdev == lun_access_src->sdev) { - found = true; - break; - } - - if (!found) { - lun_access_dst = kzalloc(sizeof(*lun_access_dst), - GFP_KERNEL); - if (unlikely(!lun_access_dst)) { - dev_err(dev, "%s: lun_access allocation fail\n", - __func__); - rc = -ENOMEM; - goto out; - } - - *lun_access_dst = *lun_access_src; - list_add(&lun_access_dst->list, &sidecar); - } - } - - if (unlikely(!ctxi_src->rht_out)) { - dev_dbg(dev, "%s: Nothing to clone\n", __func__); - goto out_success; - } - - /* User specified permission on attach */ - perms = ctxi_dst->rht_perms; - - /* - * Copy over checked-out RHT (and their associated LXT) entries by - * hand, stopping after we've copied all outstanding entries and - * cleaning up if the clone fails. - * - * Note: This loop is equivalent to performing cxlflash_disk_open and - * cxlflash_vlun_resize. As such, LUN accounting needs to be taken into - * account by attaching after each successful RHT entry clone. In the - * event that a clone failure is experienced, the LUN detach is handled - * via the cleanup performed by _cxlflash_disk_release. - */ - for (i = 0; i < MAX_RHT_PER_CONTEXT; i++) { - if (ctxi_src->rht_out == ctxi_dst->rht_out) - break; - if (ctxi_src->rht_start[i].nmask == 0) - continue; - - /* Consume a destination RHT entry */ - ctxi_dst->rht_out++; - ctxi_dst->rht_start[i].nmask = ctxi_src->rht_start[i].nmask; - ctxi_dst->rht_start[i].fp = - SISL_RHT_FP_CLONE(ctxi_src->rht_start[i].fp, perms); - ctxi_dst->rht_lun[i] = ctxi_src->rht_lun[i]; - - rc = clone_lxt(afu, blka, ctxid_dst, i, - &ctxi_dst->rht_start[i], - &ctxi_src->rht_start[i]); - if (rc) { - marshal_clone_to_rele(clone, &release); - for (j = 0; j < i; j++) { - release.rsrc_handle = j; - _cxlflash_disk_release(sdev, ctxi_dst, - &release); - } - - /* Put back the one we failed on */ - rhte_checkin(ctxi_dst, &ctxi_dst->rht_start[i]); - goto err; - } - - cxlflash_lun_attach(gli, gli->mode, false); - } - -out_success: - list_splice(&sidecar, &ctxi_dst->luns); - - /* fall through */ -out: - if (ctxi_src) - put_context(ctxi_src); - if (ctxi_dst) - put_context(ctxi_dst); - dev_dbg(dev, "%s: returning rc=%d\n", __func__, rc); - return rc; - -err: - list_for_each_entry_safe(lun_access_src, lun_access_dst, &sidecar, list) - kfree(lun_access_src); - goto out; -} diff --git a/drivers/scsi/cxlflash/vlun.h b/drivers/scsi/cxlflash/vlun.h deleted file mode 100644 index 68e3ea52fe80..000000000000 --- a/drivers/scsi/cxlflash/vlun.h +++ /dev/null @@ -1,82 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * CXL Flash Device Driver - * - * Written by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>, IBM Corporation - * Matthew R. Ochs <mrochs@linux.vnet.ibm.com>, IBM Corporation - * - * Copyright (C) 2015 IBM Corporation - */ - -#ifndef _CXLFLASH_VLUN_H -#define _CXLFLASH_VLUN_H - -/* RHT - Resource Handle Table */ -#define MC_RHT_NMASK 16 /* in bits */ -#define MC_CHUNK_SHIFT MC_RHT_NMASK /* shift to go from LBA to chunk# */ - -#define HIBIT (BITS_PER_LONG - 1) - -#define MAX_AUN_CLONE_CNT 0xFF - -/* - * LXT - LBA Translation Table - * - * +-------+-------+-------+-------+-------+-------+-------+---+---+ - * | RLBA_BASE |LUN_IDX| P |SEL| - * +-------+-------+-------+-------+-------+-------+-------+---+---+ - * - * The LXT Entry contains the physical LBA where the chunk starts (RLBA_BASE). - * AFU ORes the low order bits from the virtual LBA (offset into the chunk) - * with RLBA_BASE. The result is the physical LBA to be sent to storage. - * The LXT Entry also contains an index to a LUN TBL and a bitmask of which - * outgoing (FC) * ports can be selected. The port select bit-mask is ANDed - * with a global port select bit-mask maintained by the driver. - * In addition, it has permission bits that are ANDed with the - * RHT permissions to arrive at the final permissions for the chunk. - * - * LXT tables are allocated dynamically in groups. This is done to avoid - * a malloc/free overhead each time the LXT has to grow or shrink. - * - * Based on the current lxt_cnt (used), it is always possible to know - * how many are allocated (used+free). The number of allocated entries is - * not stored anywhere. - * - * The LXT table is re-allocated whenever it needs to cross into another group. - */ -#define LXT_GROUP_SIZE 8 -#define LXT_NUM_GROUPS(lxt_cnt) (((lxt_cnt) + 7)/8) /* alloc'ed groups */ -#define LXT_LUNIDX_SHIFT 8 /* LXT entry, shift for LUN index */ -#define LXT_PERM_SHIFT 4 /* LXT entry, shift for permission bits */ - -struct ba_lun_info { - u64 *lun_alloc_map; - u32 lun_bmap_size; - u32 total_aus; - u64 free_aun_cnt; - - /* indices to be used for elevator lookup of free map */ - u32 free_low_idx; - u32 free_curr_idx; - u32 free_high_idx; - - u8 *aun_clone_map; -}; - -struct ba_lun { - u64 lun_id; - u64 wwpn; - size_t lsize; /* LUN size in number of LBAs */ - size_t lba_size; /* LBA size in number of bytes */ - size_t au_size; /* Allocation Unit size in number of LBAs */ - struct ba_lun_info *ba_lun_handle; -}; - -/* Block Allocator */ -struct blka { - struct ba_lun ba_lun; - u64 nchunk; /* number of chunks */ - struct mutex mutex; -}; - -#endif /* ifndef _CXLFLASH_SUPERPIPE_H */ |