drivers/pci/host/vmd.c

   1 /*
   2  * Volume Management Device driver
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irq.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/msi.h>
  21 #include <linux/pci.h>
  22 #include <linux/rculist.h>
  23 #include <linux/rcupdate.h>
  24
  25 #include <asm/irqdomain.h>
  26 #include <asm/device.h>
  27 #include <asm/msi.h>
  28 #include <asm/msidef.h>
  29
  30 #define VMD_CFGBAR      0
  31 #define VMD_MEMBAR1     2
  32 #define VMD_MEMBAR2     4
  33
  34 /*
  35  * Lock for manipulating VMD IRQ lists.
  36  */
  37 static DEFINE_RAW_SPINLOCK(list_lock);
  38
  39 /**
  40  * struct vmd_irq - private data to map driver IRQ to the VMD shared vector
  41  * @node:       list item for parent traversal.
  42  * @rcu:        RCU callback item for freeing.
  43  * @irq:        back pointer to parent.
  44  * @enabled:    true if driver enabled IRQ
  45  * @virq:       the virtual IRQ value provided to the requesting driver.
  46  *
  47  * Every MSI/MSI-X IRQ requested for a device in a VMD domain will be mapped to
  48  * a VMD IRQ using this structure.
  49  */
  50 struct vmd_irq {
  51         struct list_head        node;
  52         struct rcu_head         rcu;
  53         struct vmd_irq_list     *irq;
  54         bool                    enabled;
  55         unsigned int            virq;
  56 };
  57
  58 /**
  59  * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
  60  * @irq_list:   the list of irq's the VMD one demuxes to.
  61  * @count:      number of child IRQs assigned to this vector; used to track
  62  *              sharing.
  63  */
  64 struct vmd_irq_list {
  65         struct list_head        irq_list;
  66         unsigned int            count;
  67 };
  68
  69 struct vmd_dev {
  70         struct pci_dev          *dev;
  71
  72         spinlock_t              cfg_lock;
  73         char __iomem            *cfgbar;
  74
  75         int msix_count;
  76         struct vmd_irq_list     *irqs;
  77
  78         struct pci_sysdata      sysdata;
  79         struct resource         resources[3];
  80         struct irq_domain       *irq_domain;
  81         struct pci_bus          *bus;
  82
  83 #ifdef CONFIG_X86_DEV_DMA_OPS
  84         struct dma_map_ops      dma_ops;
  85         struct dma_domain       dma_domain;
  86 #endif
  87 };
  88
  89 static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
  90 {
  91         return container_of(bus->sysdata, struct vmd_dev, sysdata);
  92 }
  93
  94 static inline unsigned int index_from_irqs(struct vmd_dev *vmd,
  95                                            struct vmd_irq_list *irqs)
  96 {
  97         return irqs - vmd->irqs;
  98 }
  99
 100 /*
 101  * Drivers managing a device in a VMD domain allocate their own IRQs as before,
 102  * but the MSI entry for the hardware it's driving will be programmed with a
 103  * destination ID for the VMD MSI-X table.  The VMD muxes interrupts in its
 104  * domain into one of its own, and the VMD driver de-muxes these for the
 105  * handlers sharing that VMD IRQ.  The vmd irq_domain provides the operations
 106  * and irq_chip to set this up.
 107  */
 108 static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 109 {
 110         struct vmd_irq *vmdirq = data->chip_data;
 111         struct vmd_irq_list *irq = vmdirq->irq;
 112         struct vmd_dev *vmd = irq_data_get_irq_handler_data(data);
 113
 114         msg->address_hi = MSI_ADDR_BASE_HI;
 115         msg->address_lo = MSI_ADDR_BASE_LO |
 116                           MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
 117         msg->data = 0;
 118 }
 119
 120 /*
 121  * We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the IRQ mask/unmask ops.
 122  */
 123 static void vmd_irq_enable(struct irq_data *data)
 124 {
 125         struct vmd_irq *vmdirq = data->chip_data;
 126         unsigned long flags;
 127
 128         raw_spin_lock_irqsave(&list_lock, flags);
 129         WARN_ON(vmdirq->enabled);
 130         list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
 131         vmdirq->enabled = true;
 132         raw_spin_unlock_irqrestore(&list_lock, flags);
 133
 134         data->chip->irq_unmask(data);
 135 }
 136
 137 static void vmd_irq_disable(struct irq_data *data)
 138 {
 139         struct vmd_irq *vmdirq = data->chip_data;
 140         unsigned long flags;
 141
 142         data->chip->irq_mask(data);
 143
 144         raw_spin_lock_irqsave(&list_lock, flags);
 145         if (vmdirq->enabled) {
 146                 list_del_rcu(&vmdirq->node);
 147                 vmdirq->enabled = false;
 148         }
 149         raw_spin_unlock_irqrestore(&list_lock, flags);
 150 }
 151
 152 /*
 153  * XXX: Stubbed until we develop acceptable way to not create conflicts with
 154  * other devices sharing the same vector.
 155  */
 156 static int vmd_irq_set_affinity(struct irq_data *data,
 157                                 const struct cpumask *dest, bool force)
 158 {
 159         return -EINVAL;
 160 }
 161
 162 static struct irq_chip vmd_msi_controller = {
 163         .name                   = "VMD-MSI",
 164         .irq_enable             = vmd_irq_enable,
 165         .irq_disable            = vmd_irq_disable,
 166         .irq_compose_msi_msg    = vmd_compose_msi_msg,
 167         .irq_set_affinity       = vmd_irq_set_affinity,
 168 };
 169
 170 static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
 171                                      msi_alloc_info_t *arg)
 172 {
 173         return 0;
 174 }
 175
 176 /*
 177  * XXX: We can be even smarter selecting the best IRQ once we solve the
 178  * affinity problem.
 179  */
 180 static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc)
 181 {
 182         int i, best = 1;
 183         unsigned long flags;
 184
 185         if (!desc->msi_attrib.is_msix || vmd->msix_count == 1)
 186                 return &vmd->irqs[0];
 187
 188         raw_spin_lock_irqsave(&list_lock, flags);
 189         for (i = 1; i < vmd->msix_count; i++)
 190                 if (vmd->irqs[i].count < vmd->irqs[best].count)
 191                         best = i;
 192         vmd->irqs[best].count++;
 193         raw_spin_unlock_irqrestore(&list_lock, flags);
 194
 195         return &vmd->irqs[best];
 196 }
 197
 198 static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
 199                         unsigned int virq, irq_hw_number_t hwirq,
 200                         msi_alloc_info_t *arg)
 201 {
 202         struct msi_desc *desc = arg->desc;
 203         struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus);
 204         struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
 205         unsigned int index, vector;
 206
 207         if (!vmdirq)
 208                 return -ENOMEM;
 209
 210         INIT_LIST_HEAD(&vmdirq->node);
 211         vmdirq->irq = vmd_next_irq(vmd, desc);
 212         vmdirq->virq = virq;
 213         index = index_from_irqs(vmd, vmdirq->irq);
 214         vector = pci_irq_vector(vmd->dev, index);
 215
 216         irq_domain_set_info(domain, virq, vector, info->chip, vmdirq,
 217                             handle_untracked_irq, vmd, NULL);
 218         return 0;
 219 }
 220
 221 static void vmd_msi_free(struct irq_domain *domain,
 222                         struct msi_domain_info *info, unsigned int virq)
 223 {
 224         struct vmd_irq *vmdirq = irq_get_chip_data(virq);
 225         unsigned long flags;
 226
 227         synchronize_rcu();
 228
 229         /* XXX: Potential optimization to rebalance */
 230         raw_spin_lock_irqsave(&list_lock, flags);
 231         vmdirq->irq->count--;
 232         raw_spin_unlock_irqrestore(&list_lock, flags);
 233
 234         kfree_rcu(vmdirq, rcu);
 235 }
 236
 237 static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
 238                            int nvec, msi_alloc_info_t *arg)
 239 {
 240         struct pci_dev *pdev = to_pci_dev(dev);
 241         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 242
 243         if (nvec > vmd->msix_count)
 244                 return vmd->msix_count;
 245
 246         memset(arg, 0, sizeof(*arg));
 247         return 0;
 248 }
 249
 250 static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 251 {
 252         arg->desc = desc;
 253 }
 254
 255 static struct msi_domain_ops vmd_msi_domain_ops = {
 256         .get_hwirq      = vmd_get_hwirq,
 257         .msi_init       = vmd_msi_init,
 258         .msi_free       = vmd_msi_free,
 259         .msi_prepare    = vmd_msi_prepare,
 260         .set_desc       = vmd_set_desc,
 261 };
 262
 263 static struct msi_domain_info vmd_msi_domain_info = {
 264         .flags          = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 265                           MSI_FLAG_PCI_MSIX,
 266         .ops            = &vmd_msi_domain_ops,
 267         .chip           = &vmd_msi_controller,
 268 };
 269
 270 #ifdef CONFIG_X86_DEV_DMA_OPS
 271 /*
 272  * VMD replaces the requester ID with its own.  DMA mappings for devices in a
 273  * VMD domain need to be mapped for the VMD, not the device requiring
 274  * the mapping.
 275  */
 276 static struct device *to_vmd_dev(struct device *dev)
 277 {
 278         struct pci_dev *pdev = to_pci_dev(dev);
 279         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 280
 281         return &vmd->dev->dev;
 282 }
 283
 284 static struct dma_map_ops *vmd_dma_ops(struct device *dev)
 285 {
 286         return get_dma_ops(to_vmd_dev(dev));
 287 }
 288
 289 static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
 290                        gfp_t flag, unsigned long attrs)
 291 {
 292         return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
 293                                        attrs);
 294 }
 295
 296 static void vmd_free(struct device *dev, size_t size, void *vaddr,
 297                      dma_addr_t addr, unsigned long attrs)
 298 {
 299         return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
 300                                       attrs);
 301 }
 302
 303 static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
 304                     void *cpu_addr, dma_addr_t addr, size_t size,
 305                     unsigned long attrs)
 306 {
 307         return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
 308                                       size, attrs);
 309 }
 310
 311 static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
 312                            void *cpu_addr, dma_addr_t addr, size_t size,
 313                            unsigned long attrs)
 314 {
 315         return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
 316                                              addr, size, attrs);
 317 }
 318
 319 static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
 320                                unsigned long offset, size_t size,
 321                                enum dma_data_direction dir,
 322                                unsigned long attrs)
 323 {
 324         return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
 325                                           dir, attrs);
 326 }
 327
 328 static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
 329                            enum dma_data_direction dir, unsigned long attrs)
 330 {
 331         vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
 332 }
 333
 334 static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 335                       enum dma_data_direction dir, unsigned long attrs)
 336 {
 337         return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
 338 }
 339
 340 static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
 341                          enum dma_data_direction dir, unsigned long attrs)
 342 {
 343         vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
 344 }
 345
 346 static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 347                                     size_t size, enum dma_data_direction dir)
 348 {
 349         vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
 350 }
 351
 352 static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
 353                                        size_t size, enum dma_data_direction dir)
 354 {
 355         vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
 356                                                  dir);
 357 }
 358
 359 static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 360                                 int nents, enum dma_data_direction dir)
 361 {
 362         vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
 363 }
 364
 365 static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 366                                    int nents, enum dma_data_direction dir)
 367 {
 368         vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
 369 }
 370
 371 static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
 372 {
 373         return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
 374 }
 375
 376 static int vmd_dma_supported(struct device *dev, u64 mask)
 377 {
 378         return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
 379 }
 380
 381 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 382 static u64 vmd_get_required_mask(struct device *dev)
 383 {
 384         return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
 385 }
 386 #endif
 387
 388 static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
 389 {
 390         struct dma_domain *domain = &vmd->dma_domain;
 391
 392         if (get_dma_ops(&vmd->dev->dev))
 393                 del_dma_domain(domain);
 394 }
 395
 396 #define ASSIGN_VMD_DMA_OPS(source, dest, fn)    \
 397         do {                                    \
 398                 if (source->fn)                 \
 399                         dest->fn = vmd_##fn;    \
 400         } while (0)
 401
 402 static void vmd_setup_dma_ops(struct vmd_dev *vmd)
 403 {
 404         const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
 405         struct dma_map_ops *dest = &vmd->dma_ops;
 406         struct dma_domain *domain = &vmd->dma_domain;
 407
 408         domain->domain_nr = vmd->sysdata.domain;
 409         domain->dma_ops = dest;
 410
 411         if (!source)
 412                 return;
 413         ASSIGN_VMD_DMA_OPS(source, dest, alloc);
 414         ASSIGN_VMD_DMA_OPS(source, dest, free);
 415         ASSIGN_VMD_DMA_OPS(source, dest, mmap);
 416         ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
 417         ASSIGN_VMD_DMA_OPS(source, dest, map_page);
 418         ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
 419         ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
 420         ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
 421         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
 422         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
 423         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
 424         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
 425         ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
 426         ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
 427 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 428         ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
 429 #endif
 430         add_dma_domain(domain);
 431 }
 432 #undef ASSIGN_VMD_DMA_OPS
 433 #else
 434 static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
 435 static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
 436 #endif
 437
 438 static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
 439                                   unsigned int devfn, int reg, int len)
 440 {
 441         char __iomem *addr = vmd->cfgbar +
 442                              (bus->number << 20) + (devfn << 12) + reg;
 443
 444         if ((addr - vmd->cfgbar) + len >=
 445             resource_size(&vmd->dev->resource[VMD_CFGBAR]))
 446                 return NULL;
 447
 448         return addr;
 449 }
 450
 451 /*
 452  * CPU may deadlock if config space is not serialized on some versions of this
 453  * hardware, so all config space access is done under a spinlock.
 454  */
 455 static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
 456                         int len, u32 *value)
 457 {
 458         struct vmd_dev *vmd = vmd_from_bus(bus);
 459         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 460         unsigned long flags;
 461         int ret = 0;
 462
 463         if (!addr)
 464                 return -EFAULT;
 465
 466         spin_lock_irqsave(&vmd->cfg_lock, flags);
 467         switch (len) {
 468         case 1:
 469                 *value = readb(addr);
 470                 break;
 471         case 2:
 472                 *value = readw(addr);
 473                 break;
 474         case 4:
 475                 *value = readl(addr);
 476                 break;
 477         default:
 478                 ret = -EINVAL;
 479                 break;
 480         }
 481         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 482         return ret;
 483 }
 484
 485 /*
 486  * VMD h/w converts non-posted config writes to posted memory writes. The
 487  * read-back in this function forces the completion so it returns only after
 488  * the config space was written, as expected.
 489  */
 490 static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
 491                          int len, u32 value)
 492 {
 493         struct vmd_dev *vmd = vmd_from_bus(bus);
 494         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 495         unsigned long flags;
 496         int ret = 0;
 497
 498         if (!addr)
 499                 return -EFAULT;
 500
 501         spin_lock_irqsave(&vmd->cfg_lock, flags);
 502         switch (len) {
 503         case 1:
 504                 writeb(value, addr);
 505                 readb(addr);
 506                 break;
 507         case 2:
 508                 writew(value, addr);
 509                 readw(addr);
 510                 break;
 511         case 4:
 512                 writel(value, addr);
 513                 readl(addr);
 514                 break;
 515         default:
 516                 ret = -EINVAL;
 517                 break;
 518         }
 519         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 520         return ret;
 521 }
 522
 523 static struct pci_ops vmd_ops = {
 524         .read           = vmd_pci_read,
 525         .write          = vmd_pci_write,
 526 };
 527
 528 static void vmd_attach_resources(struct vmd_dev *vmd)
 529 {
 530         vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
 531         vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
 532 }
 533
 534 static void vmd_detach_resources(struct vmd_dev *vmd)
 535 {
 536         vmd->dev->resource[VMD_MEMBAR1].child = NULL;
 537         vmd->dev->resource[VMD_MEMBAR2].child = NULL;
 538 }
 539
 540 /*
 541  * VMD domains start at 0x1000 to not clash with ACPI _SEG domains.
 542  */
 543 static int vmd_find_free_domain(void)
 544 {
 545         int domain = 0xffff;
 546         struct pci_bus *bus = NULL;
 547
 548         while ((bus = pci_find_next_bus(bus)) != NULL)
 549                 domain = max_t(int, domain, pci_domain_nr(bus));
 550         return domain + 1;
 551 }
 552
 553 static int vmd_enable_domain(struct vmd_dev *vmd)
 554 {
 555         struct pci_sysdata *sd = &vmd->sysdata;
 556         struct resource *res;
 557         u32 upper_bits;
 558         unsigned long flags;
 559         LIST_HEAD(resources);
 560
 561         res = &vmd->dev->resource[VMD_CFGBAR];
 562         vmd->resources[0] = (struct resource) {
 563                 .name  = "VMD CFGBAR",
 564                 .start = 0,
 565                 .end   = (resource_size(res) >> 20) - 1,
 566                 .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
 567         };
 568
 569         /*
 570          * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
 571          * put 32-bit resources in the window.
 572          *
 573          * There's no hardware reason why a 64-bit window *couldn't*
 574          * contain a 32-bit resource, but pbus_size_mem() computes the
 575          * bridge window size assuming a 64-bit window will contain no
 576          * 32-bit resources.  __pci_assign_resource() enforces that
 577          * artificial restriction to make sure everything will fit.
 578          *
 579          * The only way we could use a 64-bit non-prefechable MEMBAR is
 580          * if its address is <4GB so that we can convert it to a 32-bit
 581          * resource.  To be visible to the host OS, all VMD endpoints must
 582          * be initially configured by platform BIOS, which includes setting
 583          * up these resources.  We can assume the device is configured
 584          * according to the platform needs.
 585          */
 586         res = &vmd->dev->resource[VMD_MEMBAR1];
 587         upper_bits = upper_32_bits(res->end);
 588         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 589         if (!upper_bits)
 590                 flags &= ~IORESOURCE_MEM_64;
 591         vmd->resources[1] = (struct resource) {
 592                 .name  = "VMD MEMBAR1",
 593                 .start = res->start,
 594                 .end   = res->end,
 595                 .flags = flags,
 596                 .parent = res,
 597         };
 598
 599         res = &vmd->dev->resource[VMD_MEMBAR2];
 600         upper_bits = upper_32_bits(res->end);
 601         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 602         if (!upper_bits)
 603                 flags &= ~IORESOURCE_MEM_64;
 604         vmd->resources[2] = (struct resource) {
 605                 .name  = "VMD MEMBAR2",
 606                 .start = res->start + 0x2000,
 607                 .end   = res->end,
 608                 .flags = flags,
 609                 .parent = res,
 610         };
 611
 612         sd->vmd_domain = true;
 613         sd->domain = vmd_find_free_domain();
 614         if (sd->domain < 0)
 615                 return sd->domain;
 616
 617         sd->node = pcibus_to_node(vmd->dev->bus);
 618
 619         vmd->irq_domain = pci_msi_create_irq_domain(NULL, &vmd_msi_domain_info,
 620                                                     x86_vector_domain);
 621         if (!vmd->irq_domain)
 622                 return -ENODEV;
 623
 624         pci_add_resource(&resources, &vmd->resources[0]);
 625         pci_add_resource(&resources, &vmd->resources[1]);
 626         pci_add_resource(&resources, &vmd->resources[2]);
 627         vmd->bus = pci_create_root_bus(&vmd->dev->dev, 0, &vmd_ops, sd,
 628                                        &resources);
 629         if (!vmd->bus) {
 630                 pci_free_resource_list(&resources);
 631                 irq_domain_remove(vmd->irq_domain);
 632                 return -ENODEV;
 633         }
 634
 635         vmd_attach_resources(vmd);
 636         vmd_setup_dma_ops(vmd);
 637         dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
 638         pci_rescan_bus(vmd->bus);
 639
 640         WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
 641                                "domain"), "Can't create symlink to domain\n");
 642         return 0;
 643 }
 644
 645 static irqreturn_t vmd_irq(int irq, void *data)
 646 {
 647         struct vmd_irq_list *irqs = data;
 648         struct vmd_irq *vmdirq;
 649
 650         rcu_read_lock();
 651         list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
 652                 generic_handle_irq(vmdirq->virq);
 653         rcu_read_unlock();
 654
 655         return IRQ_HANDLED;
 656 }
 657
 658 static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
 659 {
 660         struct vmd_dev *vmd;
 661         int i, err;
 662
 663         if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
 664                 return -ENOMEM;
 665
 666         vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
 667         if (!vmd)
 668                 return -ENOMEM;
 669
 670         vmd->dev = dev;
 671         err = pcim_enable_device(dev);
 672         if (err < 0)
 673                 return err;
 674
 675         vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
 676         if (!vmd->cfgbar)
 677                 return -ENOMEM;
 678
 679         pci_set_master(dev);
 680         if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
 681             dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
 682                 return -ENODEV;
 683
 684         vmd->msix_count = pci_msix_vec_count(dev);
 685         if (vmd->msix_count < 0)
 686                 return -ENODEV;
 687
 688         vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
 689                                         PCI_IRQ_MSIX | PCI_IRQ_AFFINITY);
 690         if (vmd->msix_count < 0)
 691                 return vmd->msix_count;
 692
 693         vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
 694                                  GFP_KERNEL);
 695         if (!vmd->irqs)
 696                 return -ENOMEM;
 697
 698         for (i = 0; i < vmd->msix_count; i++) {
 699                 INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
 700                 err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
 701                                        vmd_irq, 0, "vmd", &vmd->irqs[i]);
 702                 if (err)
 703                         return err;
 704         }
 705
 706         spin_lock_init(&vmd->cfg_lock);
 707         pci_set_drvdata(dev, vmd);
 708         err = vmd_enable_domain(vmd);
 709         if (err)
 710                 return err;
 711
 712         dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
 713                  vmd->sysdata.domain);
 714         return 0;
 715 }
 716
 717 static void vmd_remove(struct pci_dev *dev)
 718 {
 719         struct vmd_dev *vmd = pci_get_drvdata(dev);
 720
 721         vmd_detach_resources(vmd);
 722         pci_set_drvdata(dev, NULL);
 723         sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
 724         pci_stop_root_bus(vmd->bus);
 725         pci_remove_root_bus(vmd->bus);
 726         vmd_teardown_dma_ops(vmd);
 727         irq_domain_remove(vmd->irq_domain);
 728 }
 729
 730 #ifdef CONFIG_PM
 731 static int vmd_suspend(struct device *dev)
 732 {
 733         struct pci_dev *pdev = to_pci_dev(dev);
 734
 735         pci_save_state(pdev);
 736         return 0;
 737 }
 738
 739 static int vmd_resume(struct device *dev)
 740 {
 741         struct pci_dev *pdev = to_pci_dev(dev);
 742
 743         pci_restore_state(pdev);
 744         return 0;
 745 }
 746 #endif
 747 static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
 748
 749 static const struct pci_device_id vmd_ids[] = {
 750         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x201d),},
 751         {0,}
 752 };
 753 MODULE_DEVICE_TABLE(pci, vmd_ids);
 754
 755 static struct pci_driver vmd_drv = {
 756         .name           = "vmd",
 757         .id_table       = vmd_ids,
 758         .probe          = vmd_probe,
 759         .remove         = vmd_remove,
 760         .driver         = {
 761                 .pm     = &vmd_dev_pm_ops,
 762         },
 763 };
 764 module_pci_driver(vmd_drv);
 765
 766 MODULE_AUTHOR("Intel Corporation");
 767 MODULE_LICENSE("GPL v2");
 768 MODULE_VERSION("0.6");