diff options
Diffstat (limited to 'drivers/ntb/hw/intel/ntb_hw_intel.c')
| -rw-r--r-- | drivers/ntb/hw/intel/ntb_hw_intel.c | 2274 |
1 files changed, 2274 insertions, 0 deletions
diff --git a/drivers/ntb/hw/intel/ntb_hw_intel.c b/drivers/ntb/hw/intel/ntb_hw_intel.c new file mode 100644 index 000000000000..87751cfd6f4f --- /dev/null +++ b/drivers/ntb/hw/intel/ntb_hw_intel.c @@ -0,0 +1,2274 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2012 Intel Corporation. All rights reserved. + * Copyright (C) 2015 EMC Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * BSD LICENSE + * + * Copyright(c) 2012 Intel Corporation. All rights reserved. + * Copyright (C) 2015 EMC Corporation. All Rights Reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copy + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Intel PCIe NTB Linux driver + * + * Contact Information: + * Jon Mason <jon.mason@intel.com> + */ + +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/random.h> +#include <linux/slab.h> +#include <linux/ntb.h> + +#include "ntb_hw_intel.h" + +#define NTB_NAME "ntb_hw_intel" +#define NTB_DESC "Intel(R) PCI-E Non-Transparent Bridge Driver" +#define NTB_VER "2.0" + +MODULE_DESCRIPTION(NTB_DESC); +MODULE_VERSION(NTB_VER); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Intel Corporation"); + +#define bar0_off(base, bar) ((base) + ((bar) << 2)) +#define bar2_off(base, bar) bar0_off(base, (bar) - 2) + +static const struct intel_ntb_reg atom_reg; +static const struct intel_ntb_alt_reg atom_pri_reg; +static const struct intel_ntb_alt_reg atom_sec_reg; +static const struct intel_ntb_alt_reg atom_b2b_reg; +static const struct intel_ntb_xlat_reg atom_pri_xlat; +static const struct intel_ntb_xlat_reg atom_sec_xlat; +static const struct intel_ntb_reg xeon_reg; +static const struct intel_ntb_alt_reg xeon_pri_reg; +static const struct intel_ntb_alt_reg xeon_sec_reg; +static const struct intel_ntb_alt_reg xeon_b2b_reg; +static const struct intel_ntb_xlat_reg xeon_pri_xlat; +static const struct intel_ntb_xlat_reg xeon_sec_xlat; +static struct intel_b2b_addr xeon_b2b_usd_addr; +static struct intel_b2b_addr xeon_b2b_dsd_addr; +static const struct ntb_dev_ops intel_ntb_ops; + +static const struct file_operations intel_ntb_debugfs_info; +static struct dentry *debugfs_dir; + +static int b2b_mw_idx = -1; +module_param(b2b_mw_idx, int, 0644); +MODULE_PARM_DESC(b2b_mw_idx, "Use this mw idx to access the peer ntb. A " + "value of zero or positive starts from first mw idx, and a " + "negative value starts from last mw idx. Both sides MUST " + "set the same value here!"); + +static unsigned int b2b_mw_share; +module_param(b2b_mw_share, uint, 0644); +MODULE_PARM_DESC(b2b_mw_share, "If the b2b mw is large enough, configure the " + "ntb so that the peer ntb only occupies the first half of " + "the mw, so the second half can still be used as a mw. Both " + "sides MUST set the same value here!"); + +module_param_named(xeon_b2b_usd_bar2_addr64, + xeon_b2b_usd_addr.bar2_addr64, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64, + "XEON B2B USD BAR 2 64-bit address"); + +module_param_named(xeon_b2b_usd_bar4_addr64, + xeon_b2b_usd_addr.bar4_addr64, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64, + "XEON B2B USD BAR 4 64-bit address"); + +module_param_named(xeon_b2b_usd_bar4_addr32, + xeon_b2b_usd_addr.bar4_addr32, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64, + "XEON B2B USD split-BAR 4 32-bit address"); + +module_param_named(xeon_b2b_usd_bar5_addr32, + xeon_b2b_usd_addr.bar5_addr32, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_usd_bar2_addr64, + "XEON B2B USD split-BAR 5 32-bit address"); + +module_param_named(xeon_b2b_dsd_bar2_addr64, + xeon_b2b_dsd_addr.bar2_addr64, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64, + "XEON B2B DSD BAR 2 64-bit address"); + +module_param_named(xeon_b2b_dsd_bar4_addr64, + xeon_b2b_dsd_addr.bar4_addr64, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64, + "XEON B2B DSD BAR 4 64-bit address"); + +module_param_named(xeon_b2b_dsd_bar4_addr32, + xeon_b2b_dsd_addr.bar4_addr32, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64, + "XEON B2B DSD split-BAR 4 32-bit address"); + +module_param_named(xeon_b2b_dsd_bar5_addr32, + xeon_b2b_dsd_addr.bar5_addr32, ullong, 0644); +MODULE_PARM_DESC(xeon_b2b_dsd_bar2_addr64, + "XEON B2B DSD split-BAR 5 32-bit address"); + +#ifndef ioread64 +#ifdef readq +#define ioread64 readq +#else +#define ioread64 _ioread64 +static inline u64 _ioread64(void __iomem *mmio) +{ + u64 low, high; + + low = ioread32(mmio); + high = ioread32(mmio + sizeof(u32)); + return low | (high << 32); +} +#endif +#endif + +#ifndef iowrite64 +#ifdef writeq +#define iowrite64 writeq +#else +#define iowrite64 _iowrite64 +static inline void _iowrite64(u64 val, void __iomem *mmio) +{ + iowrite32(val, mmio); + iowrite32(val >> 32, mmio + sizeof(u32)); +} +#endif +#endif + +static inline int pdev_is_atom(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_NTB_B2B_BWD: + return 1; + } + return 0; +} + +static inline int pdev_is_xeon(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_NTB_SS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_SS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_SS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_SS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_PS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_PS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_PS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_PS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF: + case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB: + case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT: + case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX: + return 1; + } + return 0; +} + +static inline void ndev_reset_unsafe_flags(struct intel_ntb_dev *ndev) +{ + ndev->unsafe_flags = 0; + ndev->unsafe_flags_ignore = 0; + + /* Only B2B has a workaround to avoid SDOORBELL */ + if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) + if (!ntb_topo_is_b2b(ndev->ntb.topo)) + ndev->unsafe_flags |= NTB_UNSAFE_DB; + + /* No low level workaround to avoid SB01BASE */ + if (ndev->hwerr_flags & NTB_HWERR_SB01BASE_LOCKUP) { + ndev->unsafe_flags |= NTB_UNSAFE_DB; + ndev->unsafe_flags |= NTB_UNSAFE_SPAD; + } +} + +static inline int ndev_is_unsafe(struct intel_ntb_dev *ndev, + unsigned long flag) +{ + return !!(flag & ndev->unsafe_flags & ~ndev->unsafe_flags_ignore); +} + +static inline int ndev_ignore_unsafe(struct intel_ntb_dev *ndev, + unsigned long flag) +{ + flag &= ndev->unsafe_flags; + ndev->unsafe_flags_ignore |= flag; + + return !!flag; +} + +static int ndev_mw_to_bar(struct intel_ntb_dev *ndev, int idx) +{ + if (idx < 0 || idx > ndev->mw_count) + return -EINVAL; + return ndev->reg->mw_bar[idx]; +} + +static inline int ndev_db_addr(struct intel_ntb_dev *ndev, + phys_addr_t *db_addr, resource_size_t *db_size, + phys_addr_t reg_addr, unsigned long reg) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB)) + pr_warn_once("%s: NTB unsafe doorbell access", __func__); + + if (db_addr) { + *db_addr = reg_addr + reg; + dev_dbg(ndev_dev(ndev), "Peer db addr %llx\n", *db_addr); + } + + if (db_size) { + *db_size = ndev->reg->db_size; + dev_dbg(ndev_dev(ndev), "Peer db size %llx\n", *db_size); + } + + return 0; +} + +static inline u64 ndev_db_read(struct intel_ntb_dev *ndev, + void __iomem *mmio) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB)) + pr_warn_once("%s: NTB unsafe doorbell access", __func__); + + return ndev->reg->db_ioread(mmio); +} + +static inline int ndev_db_write(struct intel_ntb_dev *ndev, u64 db_bits, + void __iomem *mmio) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB)) + pr_warn_once("%s: NTB unsafe doorbell access", __func__); + + if (db_bits & ~ndev->db_valid_mask) + return -EINVAL; + + ndev->reg->db_iowrite(db_bits, mmio); + + return 0; +} + +static inline int ndev_db_set_mask(struct intel_ntb_dev *ndev, u64 db_bits, + void __iomem *mmio) +{ + unsigned long irqflags; + + if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB)) + pr_warn_once("%s: NTB unsafe doorbell access", __func__); + + if (db_bits & ~ndev->db_valid_mask) + return -EINVAL; + + spin_lock_irqsave(&ndev->db_mask_lock, irqflags); + { + ndev->db_mask |= db_bits; + ndev->reg->db_iowrite(ndev->db_mask, mmio); + } + spin_unlock_irqrestore(&ndev->db_mask_lock, irqflags); + + return 0; +} + +static inline int ndev_db_clear_mask(struct intel_ntb_dev *ndev, u64 db_bits, + void __iomem *mmio) +{ + unsigned long irqflags; + + if (ndev_is_unsafe(ndev, NTB_UNSAFE_DB)) + pr_warn_once("%s: NTB unsafe doorbell access", __func__); + + if (db_bits & ~ndev->db_valid_mask) + return -EINVAL; + + spin_lock_irqsave(&ndev->db_mask_lock, irqflags); + { + ndev->db_mask &= ~db_bits; + ndev->reg->db_iowrite(ndev->db_mask, mmio); + } + spin_unlock_irqrestore(&ndev->db_mask_lock, irqflags); + + return 0; +} + +static inline int ndev_vec_mask(struct intel_ntb_dev *ndev, int db_vector) +{ + u64 shift, mask; + + shift = ndev->db_vec_shift; + mask = BIT_ULL(shift) - 1; + + return mask << (shift * db_vector); +} + +static inline int ndev_spad_addr(struct intel_ntb_dev *ndev, int idx, + phys_addr_t *spad_addr, phys_addr_t reg_addr, + unsigned long reg) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD)) + pr_warn_once("%s: NTB unsafe scratchpad access", __func__); + + if (idx < 0 || idx >= ndev->spad_count) + return -EINVAL; + + if (spad_addr) { + *spad_addr = reg_addr + reg + (idx << 2); + dev_dbg(ndev_dev(ndev), "Peer spad addr %llx\n", *spad_addr); + } + + return 0; +} + +static inline u32 ndev_spad_read(struct intel_ntb_dev *ndev, int idx, + void __iomem *mmio) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD)) + pr_warn_once("%s: NTB unsafe scratchpad access", __func__); + + if (idx < 0 || idx >= ndev->spad_count) + return 0; + + return ioread32(mmio + (idx << 2)); +} + +static inline int ndev_spad_write(struct intel_ntb_dev *ndev, int idx, u32 val, + void __iomem *mmio) +{ + if (ndev_is_unsafe(ndev, NTB_UNSAFE_SPAD)) + pr_warn_once("%s: NTB unsafe scratchpad access", __func__); + + if (idx < 0 || idx >= ndev->spad_count) + return -EINVAL; + + iowrite32(val, mmio + (idx << 2)); + + return 0; +} + +static irqreturn_t ndev_interrupt(struct intel_ntb_dev *ndev, int vec) +{ + u64 vec_mask; + + vec_mask = ndev_vec_mask(ndev, vec); + + dev_dbg(ndev_dev(ndev), "vec %d vec_mask %llx\n", vec, vec_mask); + + ndev->last_ts = jiffies; + + if (vec_mask & ndev->db_link_mask) { + if (ndev->reg->poll_link(ndev)) + ntb_link_event(&ndev->ntb); + } + + if (vec_mask & ndev->db_valid_mask) + ntb_db_event(&ndev->ntb, vec); + + return IRQ_HANDLED; +} + +static irqreturn_t ndev_vec_isr(int irq, void *dev) +{ + struct intel_ntb_vec *nvec = dev; + + return ndev_interrupt(nvec->ndev, nvec->num); +} + +static irqreturn_t ndev_irq_isr(int irq, void *dev) +{ + struct intel_ntb_dev *ndev = dev; + + return ndev_interrupt(ndev, irq - ndev_pdev(ndev)->irq); +} + +static int ndev_init_isr(struct intel_ntb_dev *ndev, + int msix_min, int msix_max, + int msix_shift, int total_shift) +{ + struct pci_dev *pdev; + int rc, i, msix_count, node; + + pdev = ndev_pdev(ndev); + + node = dev_to_node(&pdev->dev); + + /* Mask all doorbell interrupts */ + ndev->db_mask = ndev->db_valid_mask; + ndev->reg->db_iowrite(ndev->db_mask, + ndev->self_mmio + + ndev->self_reg->db_mask); + + /* Try to set up msix irq */ + + ndev->vec = kzalloc_node(msix_max * sizeof(*ndev->vec), + GFP_KERNEL, node); + if (!ndev->vec) + goto err_msix_vec_alloc; + + ndev->msix = kzalloc_node(msix_max * sizeof(*ndev->msix), + GFP_KERNEL, node); + if (!ndev->msix) + goto err_msix_alloc; + + for (i = 0; i < msix_max; ++i) + ndev->msix[i].entry = i; + + msix_count = pci_enable_msix_range(pdev, ndev->msix, + msix_min, msix_max); + if (msix_count < 0) + goto err_msix_enable; + + for (i = 0; i < msix_count; ++i) { + ndev->vec[i].ndev = ndev; + ndev->vec[i].num = i; + rc = request_irq(ndev->msix[i].vector, ndev_vec_isr, 0, + "ndev_vec_isr", &ndev->vec[i]); + if (rc) + goto err_msix_request; + } + + dev_dbg(ndev_dev(ndev), "Using msix interrupts\n"); + ndev->db_vec_count = msix_count; + ndev->db_vec_shift = msix_shift; + return 0; + +err_msix_request: + while (i-- > 0) + free_irq(ndev->msix[i].vector, ndev); + pci_disable_msix(pdev); +err_msix_enable: + kfree(ndev->msix); +err_msix_alloc: + kfree(ndev->vec); +err_msix_vec_alloc: + ndev->msix = NULL; + ndev->vec = NULL; + + /* Try to set up msi irq */ + + rc = pci_enable_msi(pdev); + if (rc) + goto err_msi_enable; + + rc = request_irq(pdev->irq, ndev_irq_isr, 0, + "ndev_irq_isr", ndev); + if (rc) + goto err_msi_request; + + dev_dbg(ndev_dev(ndev), "Using msi interrupts\n"); + ndev->db_vec_count = 1; + ndev->db_vec_shift = total_shift; + return 0; + +err_msi_request: + pci_disable_msi(pdev); +err_msi_enable: + + /* Try to set up intx irq */ + + pci_intx(pdev, 1); + + rc = request_irq(pdev->irq, ndev_irq_isr, IRQF_SHARED, + "ndev_irq_isr", ndev); + if (rc) + goto err_intx_request; + + dev_dbg(ndev_dev(ndev), "Using intx interrupts\n"); + ndev->db_vec_count = 1; + ndev->db_vec_shift = total_shift; + return 0; + +err_intx_request: + return rc; +} + +static void ndev_deinit_isr(struct intel_ntb_dev *ndev) +{ + struct pci_dev *pdev; + int i; + + pdev = ndev_pdev(ndev); + + /* Mask all doorbell interrupts */ + ndev->db_mask = ndev->db_valid_mask; + ndev->reg->db_iowrite(ndev->db_mask, + ndev->self_mmio + + ndev->self_reg->db_mask); + + if (ndev->msix) { + i = ndev->db_vec_count; + while (i--) + free_irq(ndev->msix[i].vector, &ndev->vec[i]); + pci_disable_msix(pdev); + kfree(ndev->msix); + kfree(ndev->vec); + } else { + free_irq(pdev->irq, ndev); + if (pci_dev_msi_enabled(pdev)) + pci_disable_msi(pdev); + } +} + +static ssize_t ndev_debugfs_read(struct file *filp, char __user *ubuf, + size_t count, loff_t *offp) +{ + struct intel_ntb_dev *ndev; + void __iomem *mmio; + char *buf; + size_t buf_size; + ssize_t ret, off; + union { u64 v64; u32 v32; u16 v16; } u; + + ndev = filp->private_data; + mmio = ndev->self_mmio; + + buf_size = min(count, 0x800ul); + + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + off = 0; + + off += scnprintf(buf + off, buf_size - off, + "NTB Device Information:\n"); + + off += scnprintf(buf + off, buf_size - off, + "Connection Topology -\t%s\n", + ntb_topo_string(ndev->ntb.topo)); + + off += scnprintf(buf + off, buf_size - off, + "B2B Offset -\t\t%#lx\n", ndev->b2b_off); + off += scnprintf(buf + off, buf_size - off, + "B2B MW Idx -\t\t%d\n", ndev->b2b_idx); + off += scnprintf(buf + off, buf_size - off, + "BAR4 Split -\t\t%s\n", + ndev->bar4_split ? "yes" : "no"); + + off += scnprintf(buf + off, buf_size - off, + "NTB CTL -\t\t%#06x\n", ndev->ntb_ctl); + off += scnprintf(buf + off, buf_size - off, + "LNK STA -\t\t%#06x\n", ndev->lnk_sta); + + if (!ndev->reg->link_is_up(ndev)) { + off += scnprintf(buf + off, buf_size - off, + "Link Status -\t\tDown\n"); + } else { + off += scnprintf(buf + off, buf_size - off, + "Link Status -\t\tUp\n"); + off += scnprintf(buf + off, buf_size - off, + "Link Speed -\t\tPCI-E Gen %u\n", + NTB_LNK_STA_SPEED(ndev->lnk_sta)); + off += scnprintf(buf + off, buf_size - off, + "Link Width -\t\tx%u\n", + NTB_LNK_STA_WIDTH(ndev->lnk_sta)); + } + + off += scnprintf(buf + off, buf_size - off, + "Memory Window Count -\t%u\n", ndev->mw_count); + off += scnprintf(buf + off, buf_size - off, + "Scratchpad Count -\t%u\n", ndev->spad_count); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Count -\t%u\n", ndev->db_count); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Vector Count -\t%u\n", ndev->db_vec_count); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Vector Shift -\t%u\n", ndev->db_vec_shift); + + off += scnprintf(buf + off, buf_size - off, + "Doorbell Valid Mask -\t%#llx\n", ndev->db_valid_mask); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Link Mask -\t%#llx\n", ndev->db_link_mask); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Mask Cached -\t%#llx\n", ndev->db_mask); + + u.v64 = ndev_db_read(ndev, mmio + ndev->self_reg->db_mask); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Mask -\t\t%#llx\n", u.v64); + + u.v64 = ndev_db_read(ndev, mmio + ndev->self_reg->db_bell); + off += scnprintf(buf + off, buf_size - off, + "Doorbell Bell -\t\t%#llx\n", u.v64); + + off += scnprintf(buf + off, buf_size - off, + "\nNTB Incoming XLAT:\n"); + + u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 2)); + off += scnprintf(buf + off, buf_size - off, + "XLAT23 -\t\t%#018llx\n", u.v64); + + if (ndev->bar4_split) { + u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 4)); + off += scnprintf(buf + off, buf_size - off, + "XLAT4 -\t\t\t%#06x\n", u.v32); + + u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 5)); + off += scnprintf(buf + off, buf_size - off, + "XLAT5 -\t\t\t%#06x\n", u.v32); + } else { + u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_xlat, 4)); + off += scnprintf(buf + off, buf_size - off, + "XLAT45 -\t\t%#018llx\n", u.v64); + } + + u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 2)); + off += scnprintf(buf + off, buf_size - off, + "LMT23 -\t\t\t%#018llx\n", u.v64); + + if (ndev->bar4_split) { + u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 4)); + off += scnprintf(buf + off, buf_size - off, + "LMT4 -\t\t\t%#06x\n", u.v32); + u.v32 = ioread32(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 5)); + off += scnprintf(buf + off, buf_size - off, + "LMT5 -\t\t\t%#06x\n", u.v32); + } else { + u.v64 = ioread64(mmio + bar2_off(ndev->xlat_reg->bar2_limit, 4)); + off += scnprintf(buf + off, buf_size - off, + "LMT45 -\t\t\t%#018llx\n", u.v64); + } + + if (pdev_is_xeon(ndev->ntb.pdev)) { + if (ntb_topo_is_b2b(ndev->ntb.topo)) { + off += scnprintf(buf + off, buf_size - off, + "\nNTB Outgoing B2B XLAT:\n"); + + u.v64 = ioread64(mmio + XEON_PBAR23XLAT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B XLAT23 -\t\t%#018llx\n", u.v64); + + if (ndev->bar4_split) { + u.v32 = ioread32(mmio + XEON_PBAR4XLAT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B XLAT4 -\t\t%#06x\n", + u.v32); + u.v32 = ioread32(mmio + XEON_PBAR5XLAT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B XLAT5 -\t\t%#06x\n", + u.v32); + } else { + u.v64 = ioread64(mmio + XEON_PBAR45XLAT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B XLAT45 -\t\t%#018llx\n", + u.v64); + } + + u.v64 = ioread64(mmio + XEON_PBAR23LMT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B LMT23 -\t\t%#018llx\n", u.v64); + + if (ndev->bar4_split) { + u.v32 = ioread32(mmio + XEON_PBAR4LMT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B LMT4 -\t\t%#06x\n", + u.v32); + u.v32 = ioread32(mmio + XEON_PBAR5LMT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B LMT5 -\t\t%#06x\n", + u.v32); + } else { + u.v64 = ioread64(mmio + XEON_PBAR45LMT_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "B2B LMT45 -\t\t%#018llx\n", + u.v64); + } + + off += scnprintf(buf + off, buf_size - off, + "\nNTB Secondary BAR:\n"); + + u.v64 = ioread64(mmio + XEON_SBAR0BASE_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "SBAR01 -\t\t%#018llx\n", u.v64); + + u.v64 = ioread64(mmio + XEON_SBAR23BASE_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "SBAR23 -\t\t%#018llx\n", u.v64); + + if (ndev->bar4_split) { + u.v32 = ioread32(mmio + XEON_SBAR4BASE_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "SBAR4 -\t\t\t%#06x\n", u.v32); + u.v32 = ioread32(mmio + XEON_SBAR5BASE_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "SBAR5 -\t\t\t%#06x\n", u.v32); + } else { + u.v64 = ioread64(mmio + XEON_SBAR45BASE_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "SBAR45 -\t\t%#018llx\n", + u.v64); + } + } + + off += scnprintf(buf + off, buf_size - off, + "\nXEON NTB Statistics:\n"); + + u.v16 = ioread16(mmio + XEON_USMEMMISS_OFFSET); + off += scnprintf(buf + off, buf_size - off, + "Upstream Memory Miss -\t%u\n", u.v16); + + off += scnprintf(buf + off, buf_size - off, + "\nXEON NTB Hardware Errors:\n"); + + if (!pci_read_config_word(ndev->ntb.pdev, + XEON_DEVSTS_OFFSET, &u.v16)) + off += scnprintf(buf + off, buf_size - off, + "DEVSTS -\t\t%#06x\n", u.v16); + + if (!pci_read_config_word(ndev->ntb.pdev, + XEON_LINK_STATUS_OFFSET, &u.v16)) + off += scnprintf(buf + off, buf_size - off, + "LNKSTS -\t\t%#06x\n", u.v16); + + if (!pci_read_config_dword(ndev->ntb.pdev, + XEON_UNCERRSTS_OFFSET, &u.v32)) + off += scnprintf(buf + off, buf_size - off, + "UNCERRSTS -\t\t%#06x\n", u.v32); + + if (!pci_read_config_dword(ndev->ntb.pdev, + XEON_CORERRSTS_OFFSET, &u.v32)) + off += scnprintf(buf + off, buf_size - off, + "CORERRSTS -\t\t%#06x\n", u.v32); + } + + ret = simple_read_from_buffer(ubuf, count, offp, buf, off); + kfree(buf); + return ret; +} + +static void ndev_init_debugfs(struct intel_ntb_dev *ndev) +{ + if (!debugfs_dir) { + ndev->debugfs_dir = NULL; + ndev->debugfs_info = NULL; + } else { + ndev->debugfs_dir = + debugfs_create_dir(ndev_name(ndev), debugfs_dir); + if (!ndev->debugfs_dir) + ndev->debugfs_info = NULL; + else + ndev->debugfs_info = + debugfs_create_file("info", S_IRUSR, + ndev->debugfs_dir, ndev, + &intel_ntb_debugfs_info); + } +} + +static void ndev_deinit_debugfs(struct intel_ntb_dev *ndev) +{ + debugfs_remove_recursive(ndev->debugfs_dir); +} + +static int intel_ntb_mw_count(struct ntb_dev *ntb) +{ + return ntb_ndev(ntb)->mw_count; +} + +static int intel_ntb_mw_get_range(struct ntb_dev *ntb, int idx, + phys_addr_t *base, + resource_size_t *size, + resource_size_t *align, + resource_size_t *align_size) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + int bar; + + if (idx >= ndev->b2b_idx && !ndev->b2b_off) + idx += 1; + + bar = ndev_mw_to_bar(ndev, idx); + if (bar < 0) + return bar; + + if (base) + *base = pci_resource_start(ndev->ntb.pdev, bar) + + (idx == ndev->b2b_idx ? ndev->b2b_off : 0); + + if (size) + *size = pci_resource_len(ndev->ntb.pdev, bar) - + (idx == ndev->b2b_idx ? ndev->b2b_off : 0); + + if (align) + *align = pci_resource_len(ndev->ntb.pdev, bar); + + if (align_size) + *align_size = 1; + + return 0; +} + +static int intel_ntb_mw_set_trans(struct ntb_dev *ntb, int idx, + dma_addr_t addr, resource_size_t size) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + unsigned long base_reg, xlat_reg, limit_reg; + resource_size_t bar_size, mw_size; + void __iomem *mmio; + u64 base, limit, reg_val; + int bar; + + if (idx >= ndev->b2b_idx && !ndev->b2b_off) + idx += 1; + + bar = ndev_mw_to_bar(ndev, idx); + if (bar < 0) + return bar; + + bar_size = pci_resource_len(ndev->ntb.pdev, bar); + + if (idx == ndev->b2b_idx) + mw_size = bar_size - ndev->b2b_off; + else + mw_size = bar_size; + + /* hardware requires that addr is aligned to bar size */ + if (addr & (bar_size - 1)) + return -EINVAL; + + /* make sure the range fits in the usable mw size */ + if (size > mw_size) + return -EINVAL; + + mmio = ndev->self_mmio; + base_reg = bar0_off(ndev->xlat_reg->bar0_base, bar); + xlat_reg = bar2_off(ndev->xlat_reg->bar2_xlat, bar); + limit_reg = bar2_off(ndev->xlat_reg->bar2_limit, bar); + + if (bar < 4 || !ndev->bar4_split) { + base = ioread64(mmio + base_reg); + + /* Set the limit if supported, if size is not mw_size */ + if (limit_reg && size != mw_size) + limit = base + size; + else + limit = 0; + + /* set and verify setting the translation address */ + iowrite64(addr, mmio + xlat_reg); + reg_val = ioread64(mmio + xlat_reg); + if (reg_val != addr) { + iowrite64(0, mmio + xlat_reg); + return -EIO; + } + + /* set and verify setting the limit */ + iowrite64(limit, mmio + limit_reg); + reg_val = ioread64(mmio + limit_reg); + if (reg_val != limit) { + iowrite64(base, mmio + limit_reg); + iowrite64(0, mmio + xlat_reg); + return -EIO; + } + } else { + /* split bar addr range must all be 32 bit */ + if (addr & (~0ull << 32)) + return -EINVAL; + if ((addr + size) & (~0ull << 32)) + return -EINVAL; + + base = ioread32(mmio + base_reg); + + /* Set the limit if supported, if size is not mw_size */ + if (limit_reg && size != mw_size) + limit = base + size; + else + limit = 0; + + /* set and verify setting the translation address */ + iowrite32(addr, mmio + xlat_reg); + reg_val = ioread32(mmio + xlat_reg); + if (reg_val != addr) { + iowrite32(0, mmio + xlat_reg); + return -EIO; + } + + /* set and verify setting the limit */ + iowrite32(limit, mmio + limit_reg); + reg_val = ioread32(mmio + limit_reg); + if (reg_val != limit) { + iowrite32(base, mmio + limit_reg); + iowrite32(0, mmio + xlat_reg); + return -EIO; + } + } + + return 0; +} + +static int intel_ntb_link_is_up(struct ntb_dev *ntb, + enum ntb_speed *speed, + enum ntb_width *width) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + if (ndev->reg->link_is_up(ndev)) { + if (speed) + *speed = NTB_LNK_STA_SPEED(ndev->lnk_sta); + if (width) + *width = NTB_LNK_STA_WIDTH(ndev->lnk_sta); + return 1; + } else { + /* TODO MAYBE: is it possible to observe the link speed and + * width while link is training? */ + if (speed) + *speed = NTB_SPEED_NONE; + if (width) + *width = NTB_WIDTH_NONE; + return 0; + } +} + +static int intel_ntb_link_enable(struct ntb_dev *ntb, + enum ntb_speed max_speed, + enum ntb_width max_width) +{ + struct intel_ntb_dev *ndev; + u32 ntb_ctl; + + ndev = container_of(ntb, struct intel_ntb_dev, ntb); + + if (ndev->ntb.topo == NTB_TOPO_SEC) + return -EINVAL; + + dev_dbg(ndev_dev(ndev), + "Enabling link with max_speed %d max_width %d\n", + max_speed, max_width); + if (max_speed != NTB_SPEED_AUTO) + dev_dbg(ndev_dev(ndev), "ignoring max_speed %d\n", max_speed); + if (max_width != NTB_WIDTH_AUTO) + dev_dbg(ndev_dev(ndev), "ignoring max_width %d\n", max_width); + + ntb_ctl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl); + ntb_ctl &= ~(NTB_CTL_DISABLE | NTB_CTL_CFG_LOCK); + ntb_ctl |= NTB_CTL_P2S_BAR2_SNOOP | NTB_CTL_S2P_BAR2_SNOOP; + ntb_ctl |= NTB_CTL_P2S_BAR4_SNOOP | NTB_CTL_S2P_BAR4_SNOOP; + if (ndev->bar4_split) + ntb_ctl |= NTB_CTL_P2S_BAR5_SNOOP | NTB_CTL_S2P_BAR5_SNOOP; + iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl); + + return 0; +} + +static int intel_ntb_link_disable(struct ntb_dev *ntb) +{ + struct intel_ntb_dev *ndev; + u32 ntb_cntl; + + ndev = container_of(ntb, struct intel_ntb_dev, ntb); + + if (ndev->ntb.topo == NTB_TOPO_SEC) + return -EINVAL; + + dev_dbg(ndev_dev(ndev), "Disabling link\n"); + + /* Bring NTB link down */ + ntb_cntl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl); + ntb_cntl &= ~(NTB_CTL_P2S_BAR2_SNOOP | NTB_CTL_S2P_BAR2_SNOOP); + ntb_cntl &= ~(NTB_CTL_P2S_BAR4_SNOOP | NTB_CTL_S2P_BAR4_SNOOP); + if (ndev->bar4_split) + ntb_cntl &= ~(NTB_CTL_P2S_BAR5_SNOOP | NTB_CTL_S2P_BAR5_SNOOP); + ntb_cntl |= NTB_CTL_DISABLE | NTB_CTL_CFG_LOCK; + iowrite32(ntb_cntl, ndev->self_mmio + ndev->reg->ntb_ctl); + + return 0; +} + +static int intel_ntb_db_is_unsafe(struct ntb_dev *ntb) +{ + return ndev_ignore_unsafe(ntb_ndev(ntb), NTB_UNSAFE_DB); +} + +static u64 intel_ntb_db_valid_mask(struct ntb_dev *ntb) +{ + return ntb_ndev(ntb)->db_valid_mask; +} + +static int intel_ntb_db_vector_count(struct ntb_dev *ntb) +{ + struct intel_ntb_dev *ndev; + + ndev = container_of(ntb, struct intel_ntb_dev, ntb); + + return ndev->db_vec_count; +} + +static u64 intel_ntb_db_vector_mask(struct ntb_dev *ntb, int db_vector) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + if (db_vector < 0 || db_vector > ndev->db_vec_count) + return 0; + + return ndev->db_valid_mask & ndev_vec_mask(ndev, db_vector); +} + +static u64 intel_ntb_db_read(struct ntb_dev *ntb) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_read(ndev, + ndev->self_mmio + + ndev->self_reg->db_bell); +} + +static int intel_ntb_db_clear(struct ntb_dev *ntb, u64 db_bits) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_write(ndev, db_bits, + ndev->self_mmio + + ndev->self_reg->db_bell); +} + +static int intel_ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_set_mask(ndev, db_bits, + ndev->self_mmio + + ndev->self_reg->db_mask); +} + +static int intel_ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_clear_mask(ndev, db_bits, + ndev->self_mmio + + ndev->self_reg->db_mask); +} + +static int intel_ntb_peer_db_addr(struct ntb_dev *ntb, + phys_addr_t *db_addr, + resource_size_t *db_size) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_addr(ndev, db_addr, db_size, ndev->peer_addr, + ndev->peer_reg->db_bell); +} + +static int intel_ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_db_write(ndev, db_bits, + ndev->peer_mmio + + ndev->peer_reg->db_bell); +} + +static int intel_ntb_spad_is_unsafe(struct ntb_dev *ntb) +{ + return ndev_ignore_unsafe(ntb_ndev(ntb), NTB_UNSAFE_SPAD); +} + +static int intel_ntb_spad_count(struct ntb_dev *ntb) +{ + struct intel_ntb_dev *ndev; + + ndev = container_of(ntb, struct intel_ntb_dev, ntb); + + return ndev->spad_count; +} + +static u32 intel_ntb_spad_read(struct ntb_dev *ntb, int idx) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_spad_read(ndev, idx, + ndev->self_mmio + + ndev->self_reg->spad); +} + +static int intel_ntb_spad_write(struct ntb_dev *ntb, + int idx, u32 val) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_spad_write(ndev, idx, val, + ndev->self_mmio + + ndev->self_reg->spad); +} + +static int intel_ntb_peer_spad_addr(struct ntb_dev *ntb, int idx, + phys_addr_t *spad_addr) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_spad_addr(ndev, idx, spad_addr, ndev->peer_addr, + ndev->peer_reg->spad); +} + +static u32 intel_ntb_peer_spad_read(struct ntb_dev *ntb, int idx) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_spad_read(ndev, idx, + ndev->peer_mmio + + ndev->peer_reg->spad); +} + +static int intel_ntb_peer_spad_write(struct ntb_dev *ntb, + int idx, u32 val) +{ + struct intel_ntb_dev *ndev = ntb_ndev(ntb); + + return ndev_spad_write(ndev, idx, val, + ndev->peer_mmio + + ndev->peer_reg->spad); +} + +/* ATOM */ + +static u64 atom_db_ioread(void __iomem *mmio) +{ + return ioread64(mmio); +} + +static void atom_db_iowrite(u64 bits, void __iomem *mmio) +{ + iowrite64(bits, mmio); +} + +static int atom_poll_link(struct intel_ntb_dev *ndev) +{ + u32 ntb_ctl; + + ntb_ctl = ioread32(ndev->self_mmio + ATOM_NTBCNTL_OFFSET); + + if (ntb_ctl == ndev->ntb_ctl) + return 0; + + ndev->ntb_ctl = ntb_ctl; + + ndev->lnk_sta = ioread32(ndev->self_mmio + ATOM_LINK_STATUS_OFFSET); + + return 1; +} + +static int atom_link_is_up(struct intel_ntb_dev *ndev) +{ + return ATOM_NTB_CTL_ACTIVE(ndev->ntb_ctl); +} + +static int atom_link_is_err(struct intel_ntb_dev *ndev) +{ + if (ioread32(ndev->self_mmio + ATOM_LTSSMSTATEJMP_OFFSET) + & ATOM_LTSSMSTATEJMP_FORCEDETECT) + return 1; + + if (ioread32(ndev->self_mmio + ATOM_IBSTERRRCRVSTS0_OFFSET) + & ATOM_IBIST_ERR_OFLOW) + return 1; + + return 0; +} + +static inline enum ntb_topo atom_ppd_topo(struct intel_ntb_dev *ndev, u32 ppd) +{ + switch (ppd & ATOM_PPD_TOPO_MASK) { + case ATOM_PPD_TOPO_B2B_USD: + dev_dbg(ndev_dev(ndev), "PPD %d B2B USD\n", ppd); + return NTB_TOPO_B2B_USD; + + case ATOM_PPD_TOPO_B2B_DSD: + dev_dbg(ndev_dev(ndev), "PPD %d B2B DSD\n", ppd); + return NTB_TOPO_B2B_DSD; + + case ATOM_PPD_TOPO_PRI_USD: + case ATOM_PPD_TOPO_PRI_DSD: /* accept bogus PRI_DSD */ + case ATOM_PPD_TOPO_SEC_USD: + case ATOM_PPD_TOPO_SEC_DSD: /* accept bogus SEC_DSD */ + dev_dbg(ndev_dev(ndev), "PPD %d non B2B disabled\n", ppd); + return NTB_TOPO_NONE; + } + + dev_dbg(ndev_dev(ndev), "PPD %d invalid\n", ppd); + return NTB_TOPO_NONE; +} + +static void atom_link_hb(struct work_struct *work) +{ + struct intel_ntb_dev *ndev = hb_ndev(work); + unsigned long poll_ts; + void __iomem *mmio; + u32 status32; + + poll_ts = ndev->last_ts + ATOM_LINK_HB_TIMEOUT; + + /* Delay polling the link status if an interrupt was received, + * unless the cached link status says the link is down. + */ + if (time_after(poll_ts, jiffies) && atom_link_is_up(ndev)) { + schedule_delayed_work(&ndev->hb_timer, poll_ts - jiffies); + return; + } + + if (atom_poll_link(ndev)) + ntb_link_event(&ndev->ntb); + + if (atom_link_is_up(ndev) || !atom_link_is_err(ndev)) { + schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_HB_TIMEOUT); + return; + } + + /* Link is down with error: recover the link! */ + + mmio = ndev->self_mmio; + + /* Driver resets the NTB ModPhy lanes - magic! */ + iowrite8(0xe0, mmio + ATOM_MODPHY_PCSREG6); + iowrite8(0x40, mmio + ATOM_MODPHY_PCSREG4); + iowrite8(0x60, mmio + ATOM_MODPHY_PCSREG4); + iowrite8(0x60, mmio + ATOM_MODPHY_PCSREG6); + + /* Driver waits 100ms to allow the NTB ModPhy to settle */ + msleep(100); + + /* Clear AER Errors, write to clear */ + status32 = ioread32(mmio + ATOM_ERRCORSTS_OFFSET); + dev_dbg(ndev_dev(ndev), "ERRCORSTS = %x\n", status32); + status32 &= PCI_ERR_COR_REP_ROLL; + iowrite32(status32, mmio + ATOM_ERRCORSTS_OFFSET); + + /* Clear unexpected electrical idle event in LTSSM, write to clear */ + status32 = ioread32(mmio + ATOM_LTSSMERRSTS0_OFFSET); + dev_dbg(ndev_dev(ndev), "LTSSMERRSTS0 = %x\n", status32); + status32 |= ATOM_LTSSMERRSTS0_UNEXPECTEDEI; + iowrite32(status32, mmio + ATOM_LTSSMERRSTS0_OFFSET); + + /* Clear DeSkew Buffer error, write to clear */ + status32 = ioread32(mmio + ATOM_DESKEWSTS_OFFSET); + dev_dbg(ndev_dev(ndev), "DESKEWSTS = %x\n", status32); + status32 |= ATOM_DESKEWSTS_DBERR; + iowrite32(status32, mmio + ATOM_DESKEWSTS_OFFSET); + + status32 = ioread32(mmio + ATOM_IBSTERRRCRVSTS0_OFFSET); + dev_dbg(ndev_dev(ndev), "IBSTERRRCRVSTS0 = %x\n", status32); + status32 &= ATOM_IBIST_ERR_OFLOW; + iowrite32(status32, mmio + ATOM_IBSTERRRCRVSTS0_OFFSET); + + /* Releases the NTB state machine to allow the link to retrain */ + status32 = ioread32(mmio + ATOM_LTSSMSTATEJMP_OFFSET); + dev_dbg(ndev_dev(ndev), "LTSSMSTATEJMP = %x\n", status32); + status32 &= ~ATOM_LTSSMSTATEJMP_FORCEDETECT; + iowrite32(status32, mmio + ATOM_LTSSMSTATEJMP_OFFSET); + + /* There is a potential race between the 2 NTB devices recovering at the + * same time. If the times are the same, the link will not recover and + * the driver will be stuck in this loop forever. Add a random interval + * to the recovery time to prevent this race. + */ + schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_RECOVERY_TIME + + prandom_u32() % ATOM_LINK_RECOVERY_TIME); +} + +static int atom_init_isr(struct intel_ntb_dev *ndev) +{ + int rc; + + rc = ndev_init_isr(ndev, 1, ATOM_DB_MSIX_VECTOR_COUNT, + ATOM_DB_MSIX_VECTOR_SHIFT, ATOM_DB_TOTAL_SHIFT); + if (rc) + return rc; + + /* ATOM doesn't have link status interrupt, poll on that platform */ + ndev->last_ts = jiffies; + INIT_DELAYED_WORK(&ndev->hb_timer, atom_link_hb); + schedule_delayed_work(&ndev->hb_timer, ATOM_LINK_HB_TIMEOUT); + + return 0; +} + +static void atom_deinit_isr(struct intel_ntb_dev *ndev) +{ + cancel_delayed_work_sync(&ndev->hb_timer); + ndev_deinit_isr(ndev); +} + +static int atom_init_ntb(struct intel_ntb_dev *ndev) +{ + ndev->mw_count = ATOM_MW_COUNT; + ndev->spad_count = ATOM_SPAD_COUNT; + ndev->db_count = ATOM_DB_COUNT; + + switch (ndev->ntb.topo) { + case NTB_TOPO_B2B_USD: + case NTB_TOPO_B2B_DSD: + ndev->self_reg = &atom_pri_reg; + ndev->peer_reg = &atom_b2b_reg; + ndev->xlat_reg = &atom_sec_xlat; + + /* Enable Bus Master and Memory Space on the secondary side */ + iowrite16(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER, + ndev->self_mmio + ATOM_SPCICMD_OFFSET); + + break; + + default: + return -EINVAL; + } + + ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1; + + return 0; +} + +static int atom_init_dev(struct intel_ntb_dev *ndev) +{ + u32 ppd; + int rc; + + rc = pci_read_config_dword(ndev->ntb.pdev, ATOM_PPD_OFFSET, &ppd); + if (rc) + return -EIO; + + ndev->ntb.topo = atom_ppd_topo(ndev, ppd); + if (ndev->ntb.topo == NTB_TOPO_NONE) + return -EINVAL; + + rc = atom_init_ntb(ndev); + if (rc) + return rc; + + rc = atom_init_isr(ndev); + if (rc) + return rc; + + if (ndev->ntb.topo != NTB_TOPO_SEC) { + /* Initiate PCI-E link training */ + rc = pci_write_config_dword(ndev->ntb.pdev, ATOM_PPD_OFFSET, + ppd | ATOM_PPD_INIT_LINK); + if (rc) + return rc; + } + + return 0; +} + +static void atom_deinit_dev(struct intel_ntb_dev *ndev) +{ + atom_deinit_isr(ndev); +} + +/* XEON */ + +static u64 xeon_db_ioread(void __iomem *mmio) +{ + return (u64)ioread16(mmio); +} + +static void xeon_db_iowrite(u64 bits, void __iomem *mmio) +{ + iowrite16((u16)bits, mmio); +} + +static int xeon_poll_link(struct intel_ntb_dev *ndev) +{ + u16 reg_val; + int rc; + + ndev->reg->db_iowrite(ndev->db_link_mask, + ndev->self_mmio + + ndev->self_reg->db_bell); + + rc = pci_read_config_word(ndev->ntb.pdev, + XEON_LINK_STATUS_OFFSET, ®_val); + if (rc) + return 0; + + if (reg_val == ndev->lnk_sta) + return 0; + + ndev->lnk_sta = reg_val; + + return 1; +} + +static int xeon_link_is_up(struct intel_ntb_dev *ndev) +{ + if (ndev->ntb.topo == NTB_TOPO_SEC) + return 1; + + return NTB_LNK_STA_ACTIVE(ndev->lnk_sta); +} + +static inline enum ntb_topo xeon_ppd_topo(struct intel_ntb_dev *ndev, u8 ppd) +{ + switch (ppd & XEON_PPD_TOPO_MASK) { + case XEON_PPD_TOPO_B2B_USD: + return NTB_TOPO_B2B_USD; + + case XEON_PPD_TOPO_B2B_DSD: + return NTB_TOPO_B2B_DSD; + + case XEON_PPD_TOPO_PRI_USD: + case XEON_PPD_TOPO_PRI_DSD: /* accept bogus PRI_DSD */ + return NTB_TOPO_PRI; + + case XEON_PPD_TOPO_SEC_USD: + case XEON_PPD_TOPO_SEC_DSD: /* accept bogus SEC_DSD */ + return NTB_TOPO_SEC; + } + + return NTB_TOPO_NONE; +} + +static inline int xeon_ppd_bar4_split(struct intel_ntb_dev *ndev, u8 ppd) +{ + if (ppd & XEON_PPD_SPLIT_BAR_MASK) { + dev_dbg(ndev_dev(ndev), "PPD %d split bar\n", ppd); + return 1; + } + return 0; +} + +static int xeon_init_isr(struct intel_ntb_dev *ndev) +{ + return ndev_init_isr(ndev, XEON_DB_MSIX_VECTOR_COUNT, + XEON_DB_MSIX_VECTOR_COUNT, + XEON_DB_MSIX_VECTOR_SHIFT, + XEON_DB_TOTAL_SHIFT); +} + +static void xeon_deinit_isr(struct intel_ntb_dev *ndev) +{ + ndev_deinit_isr(ndev); +} + +static int xeon_setup_b2b_mw(struct intel_ntb_dev *ndev, + const struct intel_b2b_addr *addr, + const struct intel_b2b_addr *peer_addr) +{ + struct pci_dev *pdev; + void __iomem *mmio; + resource_size_t bar_size; + phys_addr_t bar_addr; + int b2b_bar; + u8 bar_sz; + + pdev = ndev_pdev(ndev); + mmio = ndev->self_mmio; + + if (ndev->b2b_idx >= ndev->mw_count) { + dev_dbg(ndev_dev(ndev), "not using b2b mw\n"); + b2b_bar = 0; + ndev->b2b_off = 0; + } else { + b2b_bar = ndev_mw_to_bar(ndev, ndev->b2b_idx); + if (b2b_bar < 0) + return -EIO; + + dev_dbg(ndev_dev(ndev), "using b2b mw bar %d\n", b2b_bar); + + bar_size = pci_resource_len(ndev->ntb.pdev, b2b_bar); + + dev_dbg(ndev_dev(ndev), "b2b bar size %#llx\n", bar_size); + + if (b2b_mw_share && XEON_B2B_MIN_SIZE <= bar_size >> 1) { + dev_dbg(ndev_dev(ndev), + "b2b using first half of bar\n"); + ndev->b2b_off = bar_size >> 1; + } else if (XEON_B2B_MIN_SIZE <= bar_size) { + dev_dbg(ndev_dev(ndev), + "b2b using whole bar\n"); + ndev->b2b_off = 0; + --ndev->mw_count; + } else { + dev_dbg(ndev_dev(ndev), + "b2b bar size is too small\n"); + return -EIO; + } + } + + /* Reset the secondary bar sizes to match the primary bar sizes, + * except disable or halve the size of the b2b secondary bar. + * + * Note: code for each specific bar size register, because the register + * offsets are not in a consistent order (bar5sz comes after ppd, odd). + */ + pci_read_config_byte(pdev, XEON_PBAR23SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "PBAR23SZ %#x\n", bar_sz); + if (b2b_bar == 2) { + if (ndev->b2b_off) + bar_sz -= 1; + else + bar_sz = 0; + } + pci_write_config_byte(pdev, XEON_SBAR23SZ_OFFSET, bar_sz); + pci_read_config_byte(pdev, XEON_SBAR23SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "SBAR23SZ %#x\n", bar_sz); + + if (!ndev->bar4_split) { + pci_read_config_byte(pdev, XEON_PBAR45SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "PBAR45SZ %#x\n", bar_sz); + if (b2b_bar == 4) { + if (ndev->b2b_off) + bar_sz -= 1; + else + bar_sz = 0; + } + pci_write_config_byte(pdev, XEON_SBAR45SZ_OFFSET, bar_sz); + pci_read_config_byte(pdev, XEON_SBAR45SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "SBAR45SZ %#x\n", bar_sz); + } else { + pci_read_config_byte(pdev, XEON_PBAR4SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "PBAR4SZ %#x\n", bar_sz); + if (b2b_bar == 4) { + if (ndev->b2b_off) + bar_sz -= 1; + else + bar_sz = 0; + } + pci_write_config_byte(pdev, XEON_SBAR4SZ_OFFSET, bar_sz); + pci_read_config_byte(pdev, XEON_SBAR4SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "SBAR4SZ %#x\n", bar_sz); + + pci_read_config_byte(pdev, XEON_PBAR5SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "PBAR5SZ %#x\n", bar_sz); + if (b2b_bar == 5) { + if (ndev->b2b_off) + bar_sz -= 1; + else + bar_sz = 0; + } + pci_write_config_byte(pdev, XEON_SBAR5SZ_OFFSET, bar_sz); + pci_read_config_byte(pdev, XEON_SBAR5SZ_OFFSET, &bar_sz); + dev_dbg(ndev_dev(ndev), "SBAR5SZ %#x\n", bar_sz); + } + + /* SBAR01 hit by first part of the b2b bar */ + if (b2b_bar == 0) + bar_addr = addr->bar0_addr; + else if (b2b_bar == 2) + bar_addr = addr->bar2_addr64; + else if (b2b_bar == 4 && !ndev->bar4_split) + bar_addr = addr->bar4_addr64; + else if (b2b_bar == 4) + bar_addr = addr->bar4_addr32; + else if (b2b_bar == 5) + bar_addr = addr->bar5_addr32; + else + return -EIO; + + dev_dbg(ndev_dev(ndev), "SBAR01 %#018llx\n", bar_addr); + iowrite64(bar_addr, mmio + XEON_SBAR0BASE_OFFSET); + + /* Other SBAR are normally hit by the PBAR xlat, except for b2b bar. + * The b2b bar is either disabled above, or configured half-size, and + * it starts at the PBAR xlat + offset. + */ + + bar_addr = addr->bar2_addr64 + (b2b_bar == 2 ? ndev->b2b_off : 0); + iowrite64(bar_addr, mmio + XEON_SBAR23BASE_OFFSET); + bar_addr = ioread64(mmio + XEON_SBAR23BASE_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR23 %#018llx\n", bar_addr); + + if (!ndev->bar4_split) { + bar_addr = addr->bar4_addr64 + + (b2b_bar == 4 ? ndev->b2b_off : 0); + iowrite64(bar_addr, mmio + XEON_SBAR45BASE_OFFSET); + bar_addr = ioread64(mmio + XEON_SBAR45BASE_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR45 %#018llx\n", bar_addr); + } else { + bar_addr = addr->bar4_addr32 + + (b2b_bar == 4 ? ndev->b2b_off : 0); + iowrite32(bar_addr, mmio + XEON_SBAR4BASE_OFFSET); + bar_addr = ioread32(mmio + XEON_SBAR4BASE_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR4 %#010llx\n", bar_addr); + + bar_addr = addr->bar5_addr32 + + (b2b_bar == 5 ? ndev->b2b_off : 0); + iowrite32(bar_addr, mmio + XEON_SBAR5BASE_OFFSET); + bar_addr = ioread32(mmio + XEON_SBAR5BASE_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR5 %#010llx\n", bar_addr); + } + + /* setup incoming bar limits == base addrs (zero length windows) */ + + bar_addr = addr->bar2_addr64 + (b2b_bar == 2 ? ndev->b2b_off : 0); + iowrite64(bar_addr, mmio + XEON_SBAR23LMT_OFFSET); + bar_addr = ioread64(mmio + XEON_SBAR23LMT_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR23LMT %#018llx\n", bar_addr); + + if (!ndev->bar4_split) { + bar_addr = addr->bar4_addr64 + + (b2b_bar == 4 ? ndev->b2b_off : 0); + iowrite64(bar_addr, mmio + XEON_SBAR45LMT_OFFSET); + bar_addr = ioread64(mmio + XEON_SBAR45LMT_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR45LMT %#018llx\n", bar_addr); + } else { + bar_addr = addr->bar4_addr32 + + (b2b_bar == 4 ? ndev->b2b_off : 0); + iowrite32(bar_addr, mmio + XEON_SBAR4LMT_OFFSET); + bar_addr = ioread32(mmio + XEON_SBAR4LMT_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR4LMT %#010llx\n", bar_addr); + + bar_addr = addr->bar5_addr32 + + (b2b_bar == 5 ? ndev->b2b_off : 0); + iowrite32(bar_addr, mmio + XEON_SBAR5LMT_OFFSET); + bar_addr = ioread32(mmio + XEON_SBAR5LMT_OFFSET); + dev_dbg(ndev_dev(ndev), "SBAR5LMT %#05llx\n", bar_addr); + } + + /* zero incoming translation addrs */ + iowrite64(0, mmio + XEON_SBAR23XLAT_OFFSET); + + if (!ndev->bar4_split) { + iowrite64(0, mmio + XEON_SBAR45XLAT_OFFSET); + } else { + iowrite32(0, mmio + XEON_SBAR4XLAT_OFFSET); + iowrite32(0, mmio + XEON_SBAR5XLAT_OFFSET); + } + + /* zero outgoing translation limits (whole bar size windows) */ + iowrite64(0, mmio + XEON_PBAR23LMT_OFFSET); + if (!ndev->bar4_split) { + iowrite64(0, mmio + XEON_PBAR45LMT_OFFSET); + } else { + iowrite32(0, mmio + XEON_PBAR4LMT_OFFSET); + iowrite32(0, mmio + XEON_PBAR5LMT_OFFSET); + } + + /* set outgoing translation offsets */ + bar_addr = peer_addr->bar2_addr64; + iowrite64(bar_addr, mmio + XEON_PBAR23XLAT_OFFSET); + bar_addr = ioread64(mmio + XEON_PBAR23XLAT_OFFSET); + dev_dbg(ndev_dev(ndev), "PBAR23XLAT %#018llx\n", bar_addr); + + if (!ndev->bar4_split) { + bar_addr = peer_addr->bar4_addr64; + iowrite64(bar_addr, mmio + XEON_PBAR45XLAT_OFFSET); + bar_addr = ioread64(mmio + XEON_PBAR45XLAT_OFFSET); + dev_dbg(ndev_dev(ndev), "PBAR45XLAT %#018llx\n", bar_addr); + } else { + bar_addr = peer_addr->bar4_addr32; + iowrite32(bar_addr, mmio + XEON_PBAR4XLAT_OFFSET); + bar_addr = ioread32(mmio + XEON_PBAR4XLAT_OFFSET); + dev_dbg(ndev_dev(ndev), "PBAR4XLAT %#010llx\n", bar_addr); + + bar_addr = peer_addr->bar5_addr32; + iowrite32(bar_addr, mmio + XEON_PBAR5XLAT_OFFSET); + bar_addr = ioread32(mmio + XEON_PBAR5XLAT_OFFSET); + dev_dbg(ndev_dev(ndev), "PBAR5XLAT %#010llx\n", bar_addr); + } + + /* set the translation offset for b2b registers */ + if (b2b_bar == 0) + bar_addr = peer_addr->bar0_addr; + else if (b2b_bar == 2) + bar_addr = peer_addr->bar2_addr64; + else if (b2b_bar == 4 && !ndev->bar4_split) + bar_addr = peer_addr->bar4_addr64; + else if (b2b_bar == 4) + bar_addr = peer_addr->bar4_addr32; + else if (b2b_bar == 5) + bar_addr = peer_addr->bar5_addr32; + else + return -EIO; + + /* B2B_XLAT_OFFSET is 64bit, but can only take 32bit writes */ + dev_dbg(ndev_dev(ndev), "B2BXLAT %#018llx\n", bar_addr); + iowrite32(bar_addr, mmio + XEON_B2B_XLAT_OFFSETL); + iowrite32(bar_addr >> 32, mmio + XEON_B2B_XLAT_OFFSETU); + + if (b2b_bar) { + /* map peer ntb mmio config space registers */ + ndev->peer_mmio = pci_iomap(pdev, b2b_bar, + XEON_B2B_MIN_SIZE); + if (!ndev->peer_mmio) + return -EIO; + } + + return 0; +} + +static int xeon_init_ntb(struct intel_ntb_dev *ndev) +{ + int rc; + u32 ntb_ctl; + + if (ndev->bar4_split) + ndev->mw_count = HSX_SPLIT_BAR_MW_COUNT; + else + ndev->mw_count = XEON_MW_COUNT; + + ndev->spad_count = XEON_SPAD_COUNT; + ndev->db_count = XEON_DB_COUNT; + ndev->db_link_mask = XEON_DB_LINK_BIT; + + switch (ndev->ntb.topo) { + case NTB_TOPO_PRI: + if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) { + dev_err(ndev_dev(ndev), "NTB Primary config disabled\n"); + return -EINVAL; + } + + /* enable link to allow secondary side device to appear */ + ntb_ctl = ioread32(ndev->self_mmio + ndev->reg->ntb_ctl); + ntb_ctl &= ~NTB_CTL_DISABLE; + iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl); + + /* use half the spads for the peer */ + ndev->spad_count >>= 1; + ndev->self_reg = &xeon_pri_reg; + ndev->peer_reg = &xeon_sec_reg; + ndev->xlat_reg = &xeon_sec_xlat; + break; + + case NTB_TOPO_SEC: + if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) { + dev_err(ndev_dev(ndev), "NTB Secondary config disabled\n"); + return -EINVAL; + } + /* use half the spads for the peer */ + ndev->spad_count >>= 1; + ndev->self_reg = &xeon_sec_reg; + ndev->peer_reg = &xeon_pri_reg; + ndev->xlat_reg = &xeon_pri_xlat; + break; + + case NTB_TOPO_B2B_USD: + case NTB_TOPO_B2B_DSD: + ndev->self_reg = &xeon_pri_reg; + ndev->peer_reg = &xeon_b2b_reg; + ndev->xlat_reg = &xeon_sec_xlat; + + if (ndev->hwerr_flags & NTB_HWERR_SDOORBELL_LOCKUP) { + ndev->peer_reg = &xeon_pri_reg; + + if (b2b_mw_idx < 0) + ndev->b2b_idx = b2b_mw_idx + ndev->mw_count; + else + ndev->b2b_idx = b2b_mw_idx; + + dev_dbg(ndev_dev(ndev), + "setting up b2b mw idx %d means %d\n", + b2b_mw_idx, ndev->b2b_idx); + + } else if (ndev->hwerr_flags & NTB_HWERR_B2BDOORBELL_BIT14) { + dev_warn(ndev_dev(ndev), "Reduce doorbell count by 1\n"); + ndev->db_count -= 1; + } + + if (ndev->ntb.topo == NTB_TOPO_B2B_USD) { + rc = xeon_setup_b2b_mw(ndev, + &xeon_b2b_dsd_addr, + &xeon_b2b_usd_addr); + } else { + rc = xeon_setup_b2b_mw(ndev, + &xeon_b2b_usd_addr, + &xeon_b2b_dsd_addr); + } + if (rc) + return rc; + + /* Enable Bus Master and Memory Space on the secondary side */ + iowrite16(PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER, + ndev->self_mmio + XEON_SPCICMD_OFFSET); + + break; + + default: + return -EINVAL; + } + + ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1; + + ndev->reg->db_iowrite(ndev->db_valid_mask, + ndev->self_mmio + + ndev->self_reg->db_mask); + + return 0; +} + +static int xeon_init_dev(struct intel_ntb_dev *ndev) +{ + struct pci_dev *pdev; + u8 ppd; + int rc, mem; + + pdev = ndev_pdev(ndev); + + switch (pdev->device) { + /* There is a Xeon hardware errata related to writes to SDOORBELL or + * B2BDOORBELL in conjunction with inbound access to NTB MMIO Space, + * which may hang the system. To workaround this use the second memory + * window to access the interrupt and scratch pad registers on the + * remote system. + */ + case PCI_DEVICE_ID_INTEL_NTB_SS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_PS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF: + case PCI_DEVICE_ID_INTEL_NTB_SS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_PS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB: + case PCI_DEVICE_ID_INTEL_NTB_SS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_PS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT: + case PCI_DEVICE_ID_INTEL_NTB_SS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_PS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX: + ndev->hwerr_flags |= NTB_HWERR_SDOORBELL_LOCKUP; + break; + } + + switch (pdev->device) { + /* There is a hardware errata related to accessing any register in + * SB01BASE in the presence of bidirectional traffic crossing the NTB. + */ + case PCI_DEVICE_ID_INTEL_NTB_SS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_PS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT: + case PCI_DEVICE_ID_INTEL_NTB_SS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_PS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX: + ndev->hwerr_flags |= NTB_HWERR_SB01BASE_LOCKUP; + break; + } + + switch (pdev->device) { + /* HW Errata on bit 14 of b2bdoorbell register. Writes will not be + * mirrored to the remote system. Shrink the number of bits by one, + * since bit 14 is the last bit. + */ + case PCI_DEVICE_ID_INTEL_NTB_SS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_PS_JSF: + case PCI_DEVICE_ID_INTEL_NTB_B2B_JSF: + case PCI_DEVICE_ID_INTEL_NTB_SS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_PS_SNB: + case PCI_DEVICE_ID_INTEL_NTB_B2B_SNB: + case PCI_DEVICE_ID_INTEL_NTB_SS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_PS_IVT: + case PCI_DEVICE_ID_INTEL_NTB_B2B_IVT: + case PCI_DEVICE_ID_INTEL_NTB_SS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_PS_HSX: + case PCI_DEVICE_ID_INTEL_NTB_B2B_HSX: + ndev->hwerr_flags |= NTB_HWERR_B2BDOORBELL_BIT14; + break; + } + + ndev->reg = &xeon_reg; + + rc = pci_read_config_byte(pdev, XEON_PPD_OFFSET, &ppd); + if (rc) + return -EIO; + + ndev->ntb.topo = xeon_ppd_topo(ndev, ppd); + dev_dbg(ndev_dev(ndev), "ppd %#x topo %s\n", ppd, + ntb_topo_string(ndev->ntb.topo)); + if (ndev->ntb.topo == NTB_TOPO_NONE) + return -EINVAL; + + if (ndev->ntb.topo != NTB_TOPO_SEC) { + ndev->bar4_split = xeon_ppd_bar4_split(ndev, ppd); + dev_dbg(ndev_dev(ndev), "ppd %#x bar4_split %d\n", + ppd, ndev->bar4_split); + } else { + /* This is a way for transparent BAR to figure out if we are + * doing split BAR or not. There is no way for the hw on the + * transparent side to know and set the PPD. + */ + mem = pci_select_bars(pdev, IORESOURCE_MEM); + ndev->bar4_split = hweight32(mem) == + HSX_SPLIT_BAR_MW_COUNT + 1; + dev_dbg(ndev_dev(ndev), "mem %#x bar4_split %d\n", + mem, ndev->bar4_split); + } + + rc = xeon_init_ntb(ndev); + if (rc) + return rc; + + return xeon_init_isr(ndev); +} + +static void xeon_deinit_dev(struct intel_ntb_dev *ndev) +{ + xeon_deinit_isr(ndev); +} + +static int intel_ntb_init_pci(struct intel_ntb_dev *ndev, struct pci_dev *pdev) +{ + int rc; + + pci_set_drvdata(pdev, ndev); + + rc = pci_enable_device(pdev); + if (rc) + goto err_pci_enable; + + rc = pci_request_regions(pdev, NTB_NAME); + if (rc) + goto err_pci_regions; + + pci_set_master(pdev); + + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (rc) { + rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) + goto err_dma_mask; + dev_warn(ndev_dev(ndev), "Cannot DMA highmem\n"); + } + + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); + if (rc) { + rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (rc) + goto err_dma_mask; + dev_warn(ndev_dev(ndev), "Cannot DMA consistent highmem\n"); + } + + ndev->self_mmio = pci_iomap(pdev, 0, 0); + if (!ndev->self_mmio) { + rc = -EIO; + goto err_mmio; + } + ndev->peer_mmio = ndev->self_mmio; + + return 0; + +err_mmio: +err_dma_mask: + pci_clear_master(pdev); + pci_release_regions(pdev); +err_pci_regions: + pci_disable_device(pdev); +err_pci_enable: + pci_set_drvdata(pdev, NULL); + return rc; +} + +static void intel_ntb_deinit_pci(struct intel_ntb_dev *ndev) +{ + struct pci_dev *pdev = ndev_pdev(ndev); + + if (ndev->peer_mmio && ndev->peer_mmio != ndev->self_mmio) + pci_iounmap(pdev, ndev->peer_mmio); + pci_iounmap(pdev, ndev->self_mmio); + + pci_clear_master(pdev); + pci_release_regions(pdev); + pci_disable_device(pdev); + pci_set_drvdata(pdev, NULL); +} + +static inline void ndev_init_struct(struct intel_ntb_dev *ndev, + struct pci_dev *pdev) +{ + ndev->ntb.pdev = pdev; + ndev->ntb.topo = NTB_TOPO_NONE; + ndev->ntb.ops = &intel_ntb_ops; + + ndev->b2b_off = 0; + ndev->b2b_idx = INT_MAX; + + ndev->bar4_split = 0; + + ndev->mw_count = 0; + ndev->spad_count = 0; + ndev->db_count = 0; + ndev->db_vec_count = 0; + ndev->db_vec_shift = 0; + + ndev->ntb_ctl = 0; + ndev->lnk_sta = 0; + + ndev->db_valid_mask = 0; + ndev->db_link_mask = 0; + ndev->db_mask = 0; + + spin_lock_init(&ndev->db_mask_lock); +} + +static int intel_ntb_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct intel_ntb_dev *ndev; + int rc, node; + + node = dev_to_node(&pdev->dev); + + if (pdev_is_atom(pdev)) { + ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node); + if (!ndev) { + rc = -ENOMEM; + goto err_ndev; + } + + ndev_init_struct(ndev, pdev); + + rc = intel_ntb_init_pci(ndev, pdev); + if (rc) + goto err_init_pci; + + rc = atom_init_dev(ndev); + if (rc) + goto err_init_dev; + + } else if (pdev_is_xeon(pdev)) { + ndev = kzalloc_node(sizeof(*ndev), GFP_KERNEL, node); + if (!ndev) { + rc = -ENOMEM; + goto err_ndev; + } + + ndev_init_struct(ndev, pdev); + + rc = intel_ntb_init_pci(ndev, pdev); + if (rc) + goto err_init_pci; + + rc = xeon_init_dev(ndev); + if (rc) + goto err_init_dev; + + } else { + rc = -EINVAL; + goto err_ndev; + } + + ndev_reset_unsafe_flags(ndev); + + ndev->reg->poll_link(ndev); + + ndev_init_debugfs(ndev); + + rc = ntb_register_device(&ndev->ntb); + if (rc) + goto err_register; + + dev_info(&pdev->dev, "NTB device registered.\n"); + + return 0; + +err_register: + ndev_deinit_debugfs(ndev); + if (pdev_is_atom(pdev)) + atom_deinit_dev(ndev); + else if (pdev_is_xeon(pdev)) + xeon_deinit_dev(ndev); +err_init_dev: + intel_ntb_deinit_pci(ndev); +err_init_pci: + kfree(ndev); +err_ndev: + return rc; +} + +static void intel_ntb_pci_remove(struct pci_dev *pdev) +{ + struct intel_ntb_dev *ndev = pci_get_drvdata(pdev); + + ntb_unregister_device(&ndev->ntb); + ndev_deinit_debugfs(ndev); + if (pdev_is_atom(pdev)) + atom_deinit_dev(ndev); + else if (pdev_is_xeon(pdev)) + xeon_deinit_dev(ndev); + intel_ntb_deinit_pci(ndev); + kfree(ndev); +} + +static const struct intel_ntb_reg atom_reg = { + .poll_link = atom_poll_link, + .link_is_up = atom_link_is_up, + .db_ioread = atom_db_ioread, + .db_iowrite = atom_db_iowrite, + .db_size = sizeof(u64), + .ntb_ctl = ATOM_NTBCNTL_OFFSET, + .mw_bar = {2, 4}, +}; + +static const struct intel_ntb_alt_reg atom_pri_reg = { + .db_bell = ATOM_PDOORBELL_OFFSET, + .db_mask = ATOM_PDBMSK_OFFSET, + .spad = ATOM_SPAD_OFFSET, +}; + +static const struct intel_ntb_alt_reg atom_b2b_reg = { + .db_bell = ATOM_B2B_DOORBELL_OFFSET, + .spad = ATOM_B2B_SPAD_OFFSET, +}; + +static const struct intel_ntb_xlat_reg atom_sec_xlat = { + /* FIXME : .bar0_base = ATOM_SBAR0BASE_OFFSET, */ + /* FIXME : .bar2_limit = ATOM_SBAR2LMT_OFFSET, */ + .bar2_xlat = ATOM_SBAR2XLAT_OFFSET, +}; + +static const struct intel_ntb_reg xeon_reg = { + .poll_link = xeon_poll_link, + .link_is_up = xeon_link_is_up, + .db_ioread = xeon_db_ioread, + .db_iowrite = xeon_db_iowrite, + .db_size = sizeof(u32), + .ntb_ctl = XEON_NTBCNTL_OFFSET, + .mw_bar = {2, 4, 5}, +}; + +static const struct intel_ntb_alt_reg xeon_pri_reg = { + .db_bell = XEON_PDOORBELL_OFFSET, + .db_mask = XEON_PDBMSK_OFFSET, + .spad = XEON_SPAD_OFFSET, +}; + +static const struct intel_ntb_alt_reg xeon_sec_reg = { + .db_bell = XEON_SDOORBELL_OFFSET, + .db_mask = XEON_SDBMSK_OFFSET, + /* second half of the scratchpads */ + .spad = XEON_SPAD_OFFSET + (XEON_SPAD_COUNT << 1), +}; + +static const struct intel_ntb_alt_reg xeon_b2b_reg = { + .db_bell = XEON_B2B_DOORBELL_OFFSET, + .spad = XEON_B2B_SPAD_OFFSET, +}; + +static const struct intel_ntb_xlat_reg xeon_pri_xlat = { + /* Note: no primary .bar0_base visible to the secondary side. + * + * The secondary side cannot get the base address stored in primary + * bars. The base address is necessary to set the limit register to + * any value other than zero, or unlimited. + * + * WITHOUT THE BASE ADDRESS, THE SECONDARY SIDE CANNOT DISABLE the + * window by setting the limit equal to base, nor can it limit the size + * of the memory window by setting the limit to base + size. + */ + .bar2_limit = XEON_PBAR23LMT_OFFSET, + .bar2_xlat = XEON_PBAR23XLAT_OFFSET, +}; + +static const struct intel_ntb_xlat_reg xeon_sec_xlat = { + .bar0_base = XEON_SBAR0BASE_OFFSET, + .bar2_limit = XEON_SBAR23LMT_OFFSET, + .bar2_xlat = XEON_SBAR23XLAT_OFFSET, +}; + +static struct intel_b2b_addr xeon_b2b_usd_addr = { + .bar2_addr64 = XEON_B2B_BAR2_USD_ADDR64, + .bar4_addr64 = XEON_B2B_BAR4_USD_ADDR64, + .bar4_addr32 = XEON_B2B_BAR4_USD_ADDR32, + .bar5_addr32 = XEON_B2B_BAR5_USD_ADDR32, +}; + +static struct intel_b2b_addr xeon_b2b_dsd_addr = { + .bar2_addr64 = XEON_B2B_BAR2_DSD_ADDR64, + .bar4_addr64 = XEON_B2B_BAR4_DSD_ADDR64, + .bar4_addr32 = XEON_B2B_BAR4_DSD_ADDR32, + .bar5_addr32 = XEON_B2B_BAR5_DSD_ADDR32, +}; + +/* operations for primary side of local ntb */ +static const struct ntb_dev_ops intel_ntb_ops = { + .mw_count = intel_ntb_mw_count, + .mw_get_range = intel_ntb_mw_get_range, + .mw_set_trans = intel_ntb_mw_set_trans, + .link_is_up = intel_ntb_link_is_up, + .link_enable = intel_ntb_link_enable, + .link_disable = intel_ntb_link_disable, + .db_is_unsafe = intel_ntb_db_is_unsafe, + .db_valid_mask = intel_ntb_db_valid_mask, + .db_vector_count = intel_ntb_db_vector_count, + .db_vector_mask = intel_ntb_db_vector_mask, + .db_read = intel_ntb_db_read, + .db_clear = intel_ntb_db_clear, + .db_set_mask = intel_ntb_db_set_mask, + .db_clear_mask = intel_ntb_db_clear_mask, + .peer_db_addr = intel_ntb_peer_db_addr, + .peer_db_set = intel_ntb_peer_db_set, + .spad_is_unsafe = intel_ntb_spad_is_unsafe, + .spad_count = intel_ntb_spad_count, + .spad_read = intel_ntb_spad_read, + .spad_write = intel_ntb_spad_write, + .peer_spad_addr = intel_ntb_peer_spad_addr, + .peer_spad_read = intel_ntb_peer_spad_read, + .peer_spad_write = intel_ntb_peer_spad_write, +}; + +static const struct file_operations intel_ntb_debugfs_info = { + .owner = THIS_MODULE, + .open = simple_open, + .read = ndev_debugfs_read, +}; + +static const struct pci_device_id intel_ntb_pci_tbl[] = { + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_BWD)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_JSF)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_SNB)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_IVT)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_B2B_HSX)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_JSF)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_SNB)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_IVT)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_PS_HSX)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_JSF)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_SNB)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_IVT)}, + {PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_NTB_SS_HSX)}, + {0} +}; +MODULE_DEVICE_TABLE(pci, intel_ntb_pci_tbl); + +static struct pci_driver intel_ntb_pci_driver = { + .name = KBUILD_MODNAME, + .id_table = intel_ntb_pci_tbl, + .probe = intel_ntb_pci_probe, + .remove = intel_ntb_pci_remove, +}; + +static int __init intel_ntb_pci_driver_init(void) +{ + pr_info("%s %s\n", NTB_DESC, NTB_VER); + + if (debugfs_initialized()) + debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); + + return pci_register_driver(&intel_ntb_pci_driver); +} +module_init(intel_ntb_pci_driver_init); + +static void __exit intel_ntb_pci_driver_exit(void) +{ + pci_unregister_driver(&intel_ntb_pci_driver); + + debugfs_remove_recursive(debugfs_dir); +} +module_exit(intel_ntb_pci_driver_exit); + |