diff options
Diffstat (limited to 'drivers/cxl/core/memdev.c')
| -rw-r--r-- | drivers/cxl/core/memdev.c | 850 |
1 files changed, 812 insertions, 38 deletions
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c index a74a93310d26..e370d733e440 100644 --- a/drivers/cxl/core/memdev.c +++ b/drivers/cxl/core/memdev.c @@ -1,11 +1,14 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2020 Intel Corporation. */ +#include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/firmware.h> #include <linux/device.h> #include <linux/slab.h> #include <linux/idr.h> #include <linux/pci.h> #include <cxlmem.h> +#include "trace.h" #include "core.h" static DECLARE_RWSEM(cxl_memdev_rwsem); @@ -24,10 +27,11 @@ static void cxl_memdev_release(struct device *dev) struct cxl_memdev *cxlmd = to_cxl_memdev(dev); ida_free(&cxl_memdev_ida, cxlmd->id); + devm_cxl_memdev_edac_release(cxlmd); kfree(cxlmd); } -static char *cxl_memdev_devnode(struct device *dev, umode_t *mode, kuid_t *uid, +static char *cxl_memdev_devnode(const struct device *dev, umode_t *mode, kuid_t *uid, kgid_t *gid) { return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev)); @@ -38,8 +42,11 @@ static ssize_t firmware_version_show(struct device *dev, { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); - return sysfs_emit(buf, "%.16s\n", cxlds->firmware_version); + if (!mds) + return sysfs_emit(buf, "\n"); + return sysfs_emit(buf, "%.16s\n", mds->firmware_version); } static DEVICE_ATTR_RO(firmware_version); @@ -48,8 +55,11 @@ static ssize_t payload_max_show(struct device *dev, { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); - return sysfs_emit(buf, "%zu\n", cxlds->payload_size); + if (!mds) + return sysfs_emit(buf, "\n"); + return sysfs_emit(buf, "%zu\n", cxlds->cxl_mbox.payload_size); } static DEVICE_ATTR_RO(payload_max); @@ -58,17 +68,28 @@ static ssize_t label_storage_size_show(struct device *dev, { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); - return sysfs_emit(buf, "%zu\n", cxlds->lsa_size); + if (!mds) + return sysfs_emit(buf, "\n"); + return sysfs_emit(buf, "%zu\n", mds->lsa_size); } static DEVICE_ATTR_RO(label_storage_size); +static resource_size_t cxl_ram_size(struct cxl_dev_state *cxlds) +{ + /* Static RAM is only expected at partition 0. */ + if (cxlds->part[0].mode != CXL_PARTMODE_RAM) + return 0; + return resource_size(&cxlds->part[0].res); +} + static ssize_t ram_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; - unsigned long long len = resource_size(&cxlds->ram_res); + unsigned long long len = cxl_ram_size(cxlds); return sysfs_emit(buf, "%#llx\n", len); } @@ -81,7 +102,7 @@ static ssize_t pmem_size_show(struct device *dev, struct device_attribute *attr, { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_dev_state *cxlds = cxlmd->cxlds; - unsigned long long len = resource_size(&cxlds->pmem_res); + unsigned long long len = cxl_pmem_size(cxlds); return sysfs_emit(buf, "%#llx\n", len); } @@ -102,10 +123,296 @@ static DEVICE_ATTR_RO(serial); static ssize_t numa_node_show(struct device *dev, struct device_attribute *attr, char *buf) { - return sprintf(buf, "%d\n", dev_to_node(dev)); + return sysfs_emit(buf, "%d\n", dev_to_node(dev)); } static DEVICE_ATTR_RO(numa_node); +static ssize_t security_state_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + unsigned long state = mds->security.state; + int rc = 0; + + /* sync with latest submission state */ + mutex_lock(&cxl_mbox->mbox_mutex); + if (mds->security.sanitize_active) + rc = sysfs_emit(buf, "sanitize\n"); + mutex_unlock(&cxl_mbox->mbox_mutex); + if (rc) + return rc; + + if (!(state & CXL_PMEM_SEC_STATE_USER_PASS_SET)) + return sysfs_emit(buf, "disabled\n"); + if (state & CXL_PMEM_SEC_STATE_FROZEN || + state & CXL_PMEM_SEC_STATE_MASTER_PLIMIT || + state & CXL_PMEM_SEC_STATE_USER_PLIMIT) + return sysfs_emit(buf, "frozen\n"); + if (state & CXL_PMEM_SEC_STATE_LOCKED) + return sysfs_emit(buf, "locked\n"); + + return sysfs_emit(buf, "unlocked\n"); +} +static struct device_attribute dev_attr_security_state = + __ATTR(state, 0444, security_state_show, NULL); + +static ssize_t security_sanitize_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + bool sanitize; + ssize_t rc; + + if (kstrtobool(buf, &sanitize) || !sanitize) + return -EINVAL; + + rc = cxl_mem_sanitize(cxlmd, CXL_MBOX_OP_SANITIZE); + if (rc) + return rc; + + return len; +} +static struct device_attribute dev_attr_security_sanitize = + __ATTR(sanitize, 0200, NULL, security_sanitize_store); + +static ssize_t security_erase_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + ssize_t rc; + bool erase; + + if (kstrtobool(buf, &erase) || !erase) + return -EINVAL; + + rc = cxl_mem_sanitize(cxlmd, CXL_MBOX_OP_SECURE_ERASE); + if (rc) + return rc; + + return len; +} +static struct device_attribute dev_attr_security_erase = + __ATTR(erase, 0200, NULL, security_erase_store); + +bool cxl_memdev_has_poison_cmd(struct cxl_memdev *cxlmd, + enum poison_cmd_enabled_bits cmd) +{ + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds); + + return test_bit(cmd, mds->poison.enabled_cmds); +} + +static int cxl_get_poison_by_memdev(struct cxl_memdev *cxlmd) +{ + struct cxl_dev_state *cxlds = cxlmd->cxlds; + u64 offset, length; + int rc = 0; + + /* CXL 3.0 Spec 8.2.9.8.4.1 Separate pmem and ram poison requests */ + for (int i = 0; i < cxlds->nr_partitions; i++) { + const struct resource *res = &cxlds->part[i].res; + + offset = res->start; + length = resource_size(res); + rc = cxl_mem_get_poison(cxlmd, offset, length, NULL); + /* + * Invalid Physical Address is not an error for + * volatile addresses. Device support is optional. + */ + if (rc == -EFAULT && cxlds->part[i].mode == CXL_PARTMODE_RAM) + rc = 0; + } + return rc; +} + +int cxl_trigger_poison_list(struct cxl_memdev *cxlmd) +{ + struct cxl_port *port; + int rc; + + port = cxlmd->endpoint; + if (!port || !is_cxl_endpoint(port)) + return -EINVAL; + + ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, ®ion_rwsem))) + return rc; + + ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem))) + return rc; + + if (cxl_num_decoders_committed(port) == 0) { + /* No regions mapped to this memdev */ + rc = cxl_get_poison_by_memdev(cxlmd); + } else { + /* Regions mapped, collect poison by endpoint */ + rc = cxl_get_poison_by_endpoint(port); + } + + return rc; +} +EXPORT_SYMBOL_NS_GPL(cxl_trigger_poison_list, "CXL"); + +static int cxl_validate_poison_dpa(struct cxl_memdev *cxlmd, u64 dpa) +{ + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + if (!resource_size(&cxlds->dpa_res)) { + dev_dbg(cxlds->dev, "device has no dpa resource\n"); + return -EINVAL; + } + if (!cxl_resource_contains_addr(&cxlds->dpa_res, dpa)) { + dev_dbg(cxlds->dev, "dpa:0x%llx not in resource:%pR\n", + dpa, &cxlds->dpa_res); + return -EINVAL; + } + if (!IS_ALIGNED(dpa, 64)) { + dev_dbg(cxlds->dev, "dpa:0x%llx is not 64-byte aligned\n", dpa); + return -EINVAL; + } + + return 0; +} + +int cxl_inject_poison_locked(struct cxl_memdev *cxlmd, u64 dpa) +{ + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_mbox_inject_poison inject; + struct cxl_poison_record record; + struct cxl_mbox_cmd mbox_cmd; + struct cxl_region *cxlr; + int rc; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + lockdep_assert_held(&cxl_rwsem.dpa); + lockdep_assert_held(&cxl_rwsem.region); + + rc = cxl_validate_poison_dpa(cxlmd, dpa); + if (rc) + return rc; + + inject.address = cpu_to_le64(dpa); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_INJECT_POISON, + .size_in = sizeof(inject), + .payload_in = &inject, + }; + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc) + return rc; + + cxlr = cxl_dpa_to_region(cxlmd, dpa); + if (cxlr) + dev_warn_once(cxl_mbox->host, + "poison inject dpa:%#llx region: %s\n", dpa, + dev_name(&cxlr->dev)); + + record = (struct cxl_poison_record) { + .address = cpu_to_le64(dpa), + .length = cpu_to_le32(1), + }; + trace_cxl_poison(cxlmd, cxlr, &record, 0, 0, CXL_POISON_TRACE_INJECT); + + return 0; +} + +int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa) +{ + int rc; + + ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, ®ion_rwsem))) + return rc; + + ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem))) + return rc; + + return cxl_inject_poison_locked(cxlmd, dpa); +} +EXPORT_SYMBOL_NS_GPL(cxl_inject_poison, "CXL"); + +int cxl_clear_poison_locked(struct cxl_memdev *cxlmd, u64 dpa) +{ + struct cxl_mailbox *cxl_mbox = &cxlmd->cxlds->cxl_mbox; + struct cxl_mbox_clear_poison clear; + struct cxl_poison_record record; + struct cxl_mbox_cmd mbox_cmd; + struct cxl_region *cxlr; + int rc; + + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + + lockdep_assert_held(&cxl_rwsem.dpa); + lockdep_assert_held(&cxl_rwsem.region); + + rc = cxl_validate_poison_dpa(cxlmd, dpa); + if (rc) + return rc; + + /* + * In CXL 3.0 Spec 8.2.9.8.4.3, the Clear Poison mailbox command + * is defined to accept 64 bytes of write-data, along with the + * address to clear. This driver uses zeroes as write-data. + */ + clear = (struct cxl_mbox_clear_poison) { + .address = cpu_to_le64(dpa) + }; + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_CLEAR_POISON, + .size_in = sizeof(clear), + .payload_in = &clear, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc) + return rc; + + cxlr = cxl_dpa_to_region(cxlmd, dpa); + if (cxlr) + dev_warn_once(cxl_mbox->host, + "poison clear dpa:%#llx region: %s\n", dpa, + dev_name(&cxlr->dev)); + + record = (struct cxl_poison_record) { + .address = cpu_to_le64(dpa), + .length = cpu_to_le32(1), + }; + trace_cxl_poison(cxlmd, cxlr, &record, 0, 0, CXL_POISON_TRACE_CLEAR); + + return 0; +} + +int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa) +{ + int rc; + + ACQUIRE(rwsem_read_intr, region_rwsem)(&cxl_rwsem.region); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, ®ion_rwsem))) + return rc; + + ACQUIRE(rwsem_read_intr, dpa_rwsem)(&cxl_rwsem.dpa); + if ((rc = ACQUIRE_ERR(rwsem_read_intr, &dpa_rwsem))) + return rc; + + return cxl_clear_poison_locked(cxlmd, dpa); +} +EXPORT_SYMBOL_NS_GPL(cxl_clear_poison, "CXL"); + static struct attribute *cxl_memdev_attributes[] = { &dev_attr_serial.attr, &dev_attr_firmware_version.attr, @@ -115,13 +422,61 @@ static struct attribute *cxl_memdev_attributes[] = { NULL, }; +static struct cxl_dpa_perf *to_pmem_perf(struct cxl_dev_state *cxlds) +{ + for (int i = 0; i < cxlds->nr_partitions; i++) + if (cxlds->part[i].mode == CXL_PARTMODE_PMEM) + return &cxlds->part[i].perf; + return NULL; +} + +static ssize_t pmem_qos_class_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + return sysfs_emit(buf, "%d\n", to_pmem_perf(cxlds)->qos_class); +} + +static struct device_attribute dev_attr_pmem_qos_class = + __ATTR(qos_class, 0444, pmem_qos_class_show, NULL); + static struct attribute *cxl_memdev_pmem_attributes[] = { &dev_attr_pmem_size.attr, + &dev_attr_pmem_qos_class.attr, NULL, }; +static struct cxl_dpa_perf *to_ram_perf(struct cxl_dev_state *cxlds) +{ + if (cxlds->part[0].mode != CXL_PARTMODE_RAM) + return NULL; + return &cxlds->part[0].perf; +} + +static ssize_t ram_qos_class_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dev_state *cxlds = cxlmd->cxlds; + + return sysfs_emit(buf, "%d\n", to_ram_perf(cxlds)->qos_class); +} + +static struct device_attribute dev_attr_ram_qos_class = + __ATTR(qos_class, 0444, ram_qos_class_show, NULL); + static struct attribute *cxl_memdev_ram_attributes[] = { &dev_attr_ram_size.attr, + &dev_attr_ram_qos_class.attr, + NULL, +}; + +static struct attribute *cxl_memdev_security_attributes[] = { + &dev_attr_security_state.attr, + &dev_attr_security_sanitize.attr, + &dev_attr_security_erase.attr, NULL, }; @@ -138,23 +493,83 @@ static struct attribute_group cxl_memdev_attribute_group = { .is_visible = cxl_memdev_visible, }; +static umode_t cxl_ram_visible(struct kobject *kobj, struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dpa_perf *perf = to_ram_perf(cxlmd->cxlds); + + if (a == &dev_attr_ram_qos_class.attr && + (!perf || perf->qos_class == CXL_QOS_CLASS_INVALID)) + return 0; + + return a->mode; +} + static struct attribute_group cxl_memdev_ram_attribute_group = { .name = "ram", .attrs = cxl_memdev_ram_attributes, + .is_visible = cxl_ram_visible, }; +static umode_t cxl_pmem_visible(struct kobject *kobj, struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_dpa_perf *perf = to_pmem_perf(cxlmd->cxlds); + + if (a == &dev_attr_pmem_qos_class.attr && + (!perf || perf->qos_class == CXL_QOS_CLASS_INVALID)) + return 0; + + return a->mode; +} + static struct attribute_group cxl_memdev_pmem_attribute_group = { .name = "pmem", .attrs = cxl_memdev_pmem_attributes, + .is_visible = cxl_pmem_visible, +}; + +static umode_t cxl_memdev_security_visible(struct kobject *kobj, + struct attribute *a, int n) +{ + struct device *dev = kobj_to_dev(kobj); + struct cxl_memdev *cxlmd = to_cxl_memdev(dev); + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds); + + if (a == &dev_attr_security_sanitize.attr && + !test_bit(CXL_SEC_ENABLED_SANITIZE, mds->security.enabled_cmds)) + return 0; + + if (a == &dev_attr_security_erase.attr && + !test_bit(CXL_SEC_ENABLED_SECURE_ERASE, mds->security.enabled_cmds)) + return 0; + + return a->mode; +} + +static struct attribute_group cxl_memdev_security_attribute_group = { + .name = "security", + .attrs = cxl_memdev_security_attributes, + .is_visible = cxl_memdev_security_visible, }; static const struct attribute_group *cxl_memdev_attribute_groups[] = { &cxl_memdev_attribute_group, &cxl_memdev_ram_attribute_group, &cxl_memdev_pmem_attribute_group, + &cxl_memdev_security_attribute_group, NULL, }; +void cxl_memdev_update_perf(struct cxl_memdev *cxlmd) +{ + sysfs_update_group(&cxlmd->dev.kobj, &cxl_memdev_ram_attribute_group); + sysfs_update_group(&cxlmd->dev.kobj, &cxl_memdev_pmem_attribute_group); +} +EXPORT_SYMBOL_NS_GPL(cxl_memdev_update_perf, "CXL"); + static const struct device_type cxl_memdev_type = { .name = "cxl_memdev", .release = cxl_memdev_release, @@ -162,51 +577,54 @@ static const struct device_type cxl_memdev_type = { .groups = cxl_memdev_attribute_groups, }; -bool is_cxl_memdev(struct device *dev) +bool is_cxl_memdev(const struct device *dev) { return dev->type == &cxl_memdev_type; } -EXPORT_SYMBOL_NS_GPL(is_cxl_memdev, CXL); +EXPORT_SYMBOL_NS_GPL(is_cxl_memdev, "CXL"); /** * set_exclusive_cxl_commands() - atomically disable user cxl commands - * @cxlds: The device state to operate on + * @mds: The device state to operate on * @cmds: bitmap of commands to mark exclusive * * Grab the cxl_memdev_rwsem in write mode to flush in-flight * invocations of the ioctl path and then disable future execution of * commands with the command ids set in @cmds. */ -void set_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds) +void set_exclusive_cxl_commands(struct cxl_memdev_state *mds, + unsigned long *cmds) { - down_write(&cxl_memdev_rwsem); - bitmap_or(cxlds->exclusive_cmds, cxlds->exclusive_cmds, cmds, - CXL_MEM_COMMAND_ID_MAX); - up_write(&cxl_memdev_rwsem); + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + + guard(rwsem_write)(&cxl_memdev_rwsem); + bitmap_or(cxl_mbox->exclusive_cmds, cxl_mbox->exclusive_cmds, + cmds, CXL_MEM_COMMAND_ID_MAX); } -EXPORT_SYMBOL_NS_GPL(set_exclusive_cxl_commands, CXL); +EXPORT_SYMBOL_NS_GPL(set_exclusive_cxl_commands, "CXL"); /** * clear_exclusive_cxl_commands() - atomically enable user cxl commands - * @cxlds: The device state to modify + * @mds: The device state to modify * @cmds: bitmap of commands to mark available for userspace */ -void clear_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds) +void clear_exclusive_cxl_commands(struct cxl_memdev_state *mds, + unsigned long *cmds) { - down_write(&cxl_memdev_rwsem); - bitmap_andnot(cxlds->exclusive_cmds, cxlds->exclusive_cmds, cmds, - CXL_MEM_COMMAND_ID_MAX); - up_write(&cxl_memdev_rwsem); + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + + guard(rwsem_write)(&cxl_memdev_rwsem); + bitmap_andnot(cxl_mbox->exclusive_cmds, cxl_mbox->exclusive_cmds, + cmds, CXL_MEM_COMMAND_ID_MAX); } -EXPORT_SYMBOL_NS_GPL(clear_exclusive_cxl_commands, CXL); +EXPORT_SYMBOL_NS_GPL(clear_exclusive_cxl_commands, "CXL"); static void cxl_memdev_shutdown(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); - down_write(&cxl_memdev_rwsem); + guard(rwsem_write)(&cxl_memdev_rwsem); cxlmd->cxlds = NULL; - up_write(&cxl_memdev_rwsem); } static void cxl_memdev_unregister(void *_cxlmd) @@ -214,8 +632,8 @@ static void cxl_memdev_unregister(void *_cxlmd) struct cxl_memdev *cxlmd = _cxlmd; struct device *dev = &cxlmd->dev; - cxl_memdev_shutdown(dev); cdev_device_del(&cxlmd->cdev, dev); + cxl_memdev_shutdown(dev); put_device(dev); } @@ -242,10 +660,11 @@ static struct cxl_memdev *cxl_memdev_alloc(struct cxl_dev_state *cxlds, if (!cxlmd) return ERR_PTR(-ENOMEM); - rc = ida_alloc_range(&cxl_memdev_ida, 0, CXL_MEM_MAX_DEVS, GFP_KERNEL); + rc = ida_alloc_max(&cxl_memdev_ida, CXL_MEM_MAX_DEVS - 1, GFP_KERNEL); if (rc < 0) goto err; cxlmd->id = rc; + cxlmd->depth = -1; dev = &cxlmd->dev; device_initialize(dev); @@ -269,11 +688,14 @@ err: static long __cxl_memdev_ioctl(struct cxl_memdev *cxlmd, unsigned int cmd, unsigned long arg) { + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds); + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + switch (cmd) { case CXL_MEM_QUERY_COMMANDS: - return cxl_query_cmd(cxlmd, (void __user *)arg); + return cxl_query_cmd(cxl_mbox, (void __user *)arg); case CXL_MEM_SEND_COMMAND: - return cxl_send_cmd(cxlmd, (void __user *)arg); + return cxl_send_cmd(cxl_mbox, (void __user *)arg); default: return -ENOTTY; } @@ -283,14 +705,14 @@ static long cxl_memdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct cxl_memdev *cxlmd = file->private_data; - int rc = -ENXIO; + struct cxl_dev_state *cxlds; - down_read(&cxl_memdev_rwsem); - if (cxlmd->cxlds) - rc = __cxl_memdev_ioctl(cxlmd, cmd, arg); - up_read(&cxl_memdev_rwsem); + guard(rwsem_read)(&cxl_memdev_rwsem); + cxlds = cxlmd->cxlds; + if (cxlds && cxlds->type == CXL_DEVTYPE_CLASSMEM) + return __cxl_memdev_ioctl(cxlmd, cmd, arg); - return rc; + return -ENXIO; } static int cxl_memdev_open(struct inode *inode, struct file *file) @@ -314,6 +736,312 @@ static int cxl_memdev_release_file(struct inode *inode, struct file *file) return 0; } +/** + * cxl_mem_get_fw_info - Get Firmware info + * @mds: The device data for the operation + * + * Retrieve firmware info for the device specified. + * + * Return: 0 if no error: or the result of the mailbox command. + * + * See CXL-3.0 8.2.9.3.1 Get FW Info + */ +static int cxl_mem_get_fw_info(struct cxl_memdev_state *mds) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct cxl_mbox_get_fw_info info; + struct cxl_mbox_cmd mbox_cmd; + int rc; + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_FW_INFO, + .size_out = sizeof(info), + .payload_out = &info, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return rc; + + mds->fw.num_slots = info.num_slots; + mds->fw.cur_slot = FIELD_GET(CXL_FW_INFO_SLOT_INFO_CUR_MASK, + info.slot_info); + + return 0; +} + +/** + * cxl_mem_activate_fw - Activate Firmware + * @mds: The device data for the operation + * @slot: slot number to activate + * + * Activate firmware in a given slot for the device specified. + * + * Return: 0 if no error: or the result of the mailbox command. + * + * See CXL-3.0 8.2.9.3.3 Activate FW + */ +static int cxl_mem_activate_fw(struct cxl_memdev_state *mds, int slot) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct cxl_mbox_activate_fw activate; + struct cxl_mbox_cmd mbox_cmd; + + if (slot == 0 || slot > mds->fw.num_slots) + return -EINVAL; + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_ACTIVATE_FW, + .size_in = sizeof(activate), + .payload_in = &activate, + }; + + /* Only offline activation supported for now */ + activate.action = CXL_FW_ACTIVATE_OFFLINE; + activate.slot = slot; + + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); +} + +/** + * cxl_mem_abort_fw_xfer - Abort an in-progress FW transfer + * @mds: The device data for the operation + * + * Abort an in-progress firmware transfer for the device specified. + * + * Return: 0 if no error: or the result of the mailbox command. + * + * See CXL-3.0 8.2.9.3.2 Transfer FW + */ +static int cxl_mem_abort_fw_xfer(struct cxl_memdev_state *mds) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct cxl_mbox_transfer_fw *transfer; + struct cxl_mbox_cmd mbox_cmd; + int rc; + + transfer = kzalloc(struct_size(transfer, data, 0), GFP_KERNEL); + if (!transfer) + return -ENOMEM; + + /* Set a 1s poll interval and a total wait time of 30s */ + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_TRANSFER_FW, + .size_in = sizeof(*transfer), + .payload_in = transfer, + .poll_interval_ms = 1000, + .poll_count = 30, + }; + + transfer->action = CXL_FW_TRANSFER_ACTION_ABORT; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + kfree(transfer); + return rc; +} + +static void cxl_fw_cleanup(struct fw_upload *fwl) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + + mds->fw.next_slot = 0; +} + +static int cxl_fw_do_cancel(struct fw_upload *fwl) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + struct cxl_dev_state *cxlds = &mds->cxlds; + struct cxl_memdev *cxlmd = cxlds->cxlmd; + int rc; + + rc = cxl_mem_abort_fw_xfer(mds); + if (rc < 0) + dev_err(&cxlmd->dev, "Error aborting FW transfer: %d\n", rc); + + return FW_UPLOAD_ERR_CANCELED; +} + +static enum fw_upload_err cxl_fw_prepare(struct fw_upload *fwl, const u8 *data, + u32 size) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + struct cxl_mbox_transfer_fw *transfer; + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + + if (!size) + return FW_UPLOAD_ERR_INVALID_SIZE; + + mds->fw.oneshot = struct_size(transfer, data, size) < + cxl_mbox->payload_size; + + if (cxl_mem_get_fw_info(mds)) + return FW_UPLOAD_ERR_HW_ERROR; + + /* + * So far no state has been changed, hence no other cleanup is + * necessary. Simply return the cancelled status. + */ + if (test_and_clear_bit(CXL_FW_CANCEL, mds->fw.state)) + return FW_UPLOAD_ERR_CANCELED; + + return FW_UPLOAD_ERR_NONE; +} + +static enum fw_upload_err cxl_fw_write(struct fw_upload *fwl, const u8 *data, + u32 offset, u32 size, u32 *written) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + struct cxl_dev_state *cxlds = &mds->cxlds; + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; + struct cxl_memdev *cxlmd = cxlds->cxlmd; + struct cxl_mbox_transfer_fw *transfer; + struct cxl_mbox_cmd mbox_cmd; + u32 cur_size, remaining; + size_t size_in; + int rc; + + *written = 0; + + /* Offset has to be aligned to 128B (CXL-3.0 8.2.9.3.2 Table 8-57) */ + if (!IS_ALIGNED(offset, CXL_FW_TRANSFER_ALIGNMENT)) { + dev_err(&cxlmd->dev, + "misaligned offset for FW transfer slice (%u)\n", + offset); + return FW_UPLOAD_ERR_RW_ERROR; + } + + /* + * Pick transfer size based on mds->payload_size @size must bw 128-byte + * aligned, ->payload_size is a power of 2 starting at 256 bytes, and + * sizeof(*transfer) is 128. These constraints imply that @cur_size + * will always be 128b aligned. + */ + cur_size = min_t(size_t, size, cxl_mbox->payload_size - sizeof(*transfer)); + + remaining = size - cur_size; + size_in = struct_size(transfer, data, cur_size); + + if (test_and_clear_bit(CXL_FW_CANCEL, mds->fw.state)) + return cxl_fw_do_cancel(fwl); + + /* + * Slot numbers are 1-indexed + * cur_slot is the 0-indexed next_slot (i.e. 'cur_slot - 1 + 1') + * Check for rollover using modulo, and 1-index it by adding 1 + */ + mds->fw.next_slot = (mds->fw.cur_slot % mds->fw.num_slots) + 1; + + /* Do the transfer via mailbox cmd */ + transfer = kzalloc(size_in, GFP_KERNEL); + if (!transfer) + return FW_UPLOAD_ERR_RW_ERROR; + + transfer->offset = cpu_to_le32(offset / CXL_FW_TRANSFER_ALIGNMENT); + memcpy(transfer->data, data + offset, cur_size); + if (mds->fw.oneshot) { + transfer->action = CXL_FW_TRANSFER_ACTION_FULL; + transfer->slot = mds->fw.next_slot; + } else { + if (offset == 0) { + transfer->action = CXL_FW_TRANSFER_ACTION_INITIATE; + } else if (remaining == 0) { + transfer->action = CXL_FW_TRANSFER_ACTION_END; + transfer->slot = mds->fw.next_slot; + } else { + transfer->action = CXL_FW_TRANSFER_ACTION_CONTINUE; + } + } + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_TRANSFER_FW, + .size_in = size_in, + .payload_in = transfer, + .poll_interval_ms = 1000, + .poll_count = 30, + }; + + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) { + rc = FW_UPLOAD_ERR_RW_ERROR; + goto out_free; + } + + *written = cur_size; + + /* Activate FW if oneshot or if the last slice was written */ + if (mds->fw.oneshot || remaining == 0) { + dev_dbg(&cxlmd->dev, "Activating firmware slot: %d\n", + mds->fw.next_slot); + rc = cxl_mem_activate_fw(mds, mds->fw.next_slot); + if (rc < 0) { + dev_err(&cxlmd->dev, "Error activating firmware: %d\n", + rc); + rc = FW_UPLOAD_ERR_HW_ERROR; + goto out_free; + } + } + + rc = FW_UPLOAD_ERR_NONE; + +out_free: + kfree(transfer); + return rc; +} + +static enum fw_upload_err cxl_fw_poll_complete(struct fw_upload *fwl) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + + /* + * cxl_internal_send_cmd() handles background operations synchronously. + * No need to wait for completions here - any errors would've been + * reported and handled during the ->write() call(s). + * Just check if a cancel request was received, and return success. + */ + if (test_and_clear_bit(CXL_FW_CANCEL, mds->fw.state)) + return cxl_fw_do_cancel(fwl); + + return FW_UPLOAD_ERR_NONE; +} + +static void cxl_fw_cancel(struct fw_upload *fwl) +{ + struct cxl_memdev_state *mds = fwl->dd_handle; + + set_bit(CXL_FW_CANCEL, mds->fw.state); +} + +static const struct fw_upload_ops cxl_memdev_fw_ops = { + .prepare = cxl_fw_prepare, + .write = cxl_fw_write, + .poll_complete = cxl_fw_poll_complete, + .cancel = cxl_fw_cancel, + .cleanup = cxl_fw_cleanup, +}; + +static void cxl_remove_fw_upload(void *fwl) +{ + firmware_upload_unregister(fwl); +} + +int devm_cxl_setup_fw_upload(struct device *host, struct cxl_memdev_state *mds) +{ + struct cxl_dev_state *cxlds = &mds->cxlds; + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; + struct device *dev = &cxlds->cxlmd->dev; + struct fw_upload *fwl; + + if (!test_bit(CXL_MEM_COMMAND_ID_GET_FW_INFO, cxl_mbox->enabled_cmds)) + return 0; + + fwl = firmware_upload_register(THIS_MODULE, dev, dev_name(dev), + &cxl_memdev_fw_ops, mds); + if (IS_ERR(fwl)) + return PTR_ERR(fwl); + return devm_add_action_or_reset(host, cxl_remove_fw_upload, fwl); +} +EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_fw_upload, "CXL"); + static const struct file_operations cxl_memdev_fops = { .owner = THIS_MODULE, .unlocked_ioctl = cxl_memdev_ioctl, @@ -323,7 +1051,8 @@ static const struct file_operations cxl_memdev_fops = { .llseek = noop_llseek, }; -struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds) +struct cxl_memdev *devm_cxl_add_memdev(struct device *host, + struct cxl_dev_state *cxlds) { struct cxl_memdev *cxlmd; struct device *dev; @@ -351,7 +1080,7 @@ struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds) if (rc) goto err; - rc = devm_add_action_or_reset(cxlds->dev, cxl_memdev_unregister, cxlmd); + rc = devm_add_action_or_reset(host, cxl_memdev_unregister, cxlmd); if (rc) return ERR_PTR(rc); return cxlmd; @@ -365,7 +1094,52 @@ err: put_device(dev); return ERR_PTR(rc); } -EXPORT_SYMBOL_NS_GPL(devm_cxl_add_memdev, CXL); +EXPORT_SYMBOL_NS_GPL(devm_cxl_add_memdev, "CXL"); + +static void sanitize_teardown_notifier(void *data) +{ + struct cxl_memdev_state *mds = data; + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct kernfs_node *state; + + /* + * Prevent new irq triggered invocations of the workqueue and + * flush inflight invocations. + */ + mutex_lock(&cxl_mbox->mbox_mutex); + state = mds->security.sanitize_node; + mds->security.sanitize_node = NULL; + mutex_unlock(&cxl_mbox->mbox_mutex); + + cancel_delayed_work_sync(&mds->security.poll_dwork); + sysfs_put(state); +} + +int devm_cxl_sanitize_setup_notifier(struct device *host, + struct cxl_memdev *cxlmd) +{ + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + struct kernfs_node *sec; + + if (!test_bit(CXL_SEC_ENABLED_SANITIZE, mds->security.enabled_cmds)) + return 0; + + /* + * Note, the expectation is that @cxlmd would have failed to be + * created if these sysfs_get_dirent calls fail. + */ + sec = sysfs_get_dirent(cxlmd->dev.kobj.sd, "security"); + if (!sec) + return -ENOENT; + mds->security.sanitize_node = sysfs_get_dirent(sec, "state"); + sysfs_put(sec); + if (!mds->security.sanitize_node) + return -ENOENT; + + return devm_add_action_or_reset(host, sanitize_teardown_notifier, mds); +} +EXPORT_SYMBOL_NS_GPL(devm_cxl_sanitize_setup_notifier, "CXL"); __init int cxl_memdev_init(void) { |