drivers/pci/controller/vmd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Volume Management Device driver
   4  * Copyright (c) 2015, Intel Corporation.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/irq.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/msi.h>
  13 #include <linux/pci.h>
  14 #include <linux/srcu.h>
  15 #include <linux/rculist.h>
  16 #include <linux/rcupdate.h>
  17
  18 #include <asm/irqdomain.h>
  19 #include <asm/device.h>
  20 #include <asm/msi.h>
  21 #include <asm/msidef.h>
  22
  23 #define VMD_CFGBAR      0
  24 #define VMD_MEMBAR1     2
  25 #define VMD_MEMBAR2     4
  26
  27 #define PCI_REG_VMCAP           0x40
  28 #define BUS_RESTRICT_CAP(vmcap) (vmcap & 0x1)
  29 #define PCI_REG_VMCONFIG        0x44
  30 #define BUS_RESTRICT_CFG(vmcfg) ((vmcfg >> 8) & 0x3)
  31 #define PCI_REG_VMLOCK          0x70
  32 #define MB2_SHADOW_EN(vmlock)   (vmlock & 0x2)
  33
  34 #define MB2_SHADOW_OFFSET       0x2000
  35 #define MB2_SHADOW_SIZE         16
  36
  37 enum vmd_features {
  38         /*
  39          * Device may contain registers which hint the physical location of the
  40          * membars, in order to allow proper address translation during
  41          * resource assignment to enable guest virtualization
  42          */
  43         VMD_FEAT_HAS_MEMBAR_SHADOW      = (1 << 0),
  44
  45         /*
  46          * Device may provide root port configuration information which limits
  47          * bus numbering
  48          */
  49         VMD_FEAT_HAS_BUS_RESTRICTIONS   = (1 << 1),
  50 };
  51
  52 /*
  53  * Lock for manipulating VMD IRQ lists.
  54  */
  55 static DEFINE_RAW_SPINLOCK(list_lock);
  56
  57 /**
  58  * struct vmd_irq - private data to map driver IRQ to the VMD shared vector
  59  * @node:       list item for parent traversal.
  60  * @irq:        back pointer to parent.
  61  * @enabled:    true if driver enabled IRQ
  62  * @virq:       the virtual IRQ value provided to the requesting driver.
  63  *
  64  * Every MSI/MSI-X IRQ requested for a device in a VMD domain will be mapped to
  65  * a VMD IRQ using this structure.
  66  */
  67 struct vmd_irq {
  68         struct list_head        node;
  69         struct vmd_irq_list     *irq;
  70         bool                    enabled;
  71         unsigned int            virq;
  72 };
  73
  74 /**
  75  * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
  76  * @irq_list:   the list of irq's the VMD one demuxes to.
  77  * @srcu:       SRCU struct for local synchronization.
  78  * @count:      number of child IRQs assigned to this vector; used to track
  79  *              sharing.
  80  */
  81 struct vmd_irq_list {
  82         struct list_head        irq_list;
  83         struct srcu_struct      srcu;
  84         unsigned int            count;
  85 };
  86
  87 struct vmd_dev {
  88         struct pci_dev          *dev;
  89
  90         spinlock_t              cfg_lock;
  91         char __iomem            *cfgbar;
  92
  93         int msix_count;
  94         struct vmd_irq_list     *irqs;
  95
  96         struct pci_sysdata      sysdata;
  97         struct resource         resources[3];
  98         struct irq_domain       *irq_domain;
  99         struct pci_bus          *bus;
 100         u8                      busn_start;
 101
 102         struct dma_map_ops      dma_ops;
 103         struct dma_domain       dma_domain;
 104 };
 105
 106 static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
 107 {
 108         return container_of(bus->sysdata, struct vmd_dev, sysdata);
 109 }
 110
 111 static inline unsigned int index_from_irqs(struct vmd_dev *vmd,
 112                                            struct vmd_irq_list *irqs)
 113 {
 114         return irqs - vmd->irqs;
 115 }
 116
 117 /*
 118  * Drivers managing a device in a VMD domain allocate their own IRQs as before,
 119  * but the MSI entry for the hardware it's driving will be programmed with a
 120  * destination ID for the VMD MSI-X table.  The VMD muxes interrupts in its
 121  * domain into one of its own, and the VMD driver de-muxes these for the
 122  * handlers sharing that VMD IRQ.  The vmd irq_domain provides the operations
 123  * and irq_chip to set this up.
 124  */
 125 static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 126 {
 127         struct vmd_irq *vmdirq = data->chip_data;
 128         struct vmd_irq_list *irq = vmdirq->irq;
 129         struct vmd_dev *vmd = irq_data_get_irq_handler_data(data);
 130
 131         msg->address_hi = MSI_ADDR_BASE_HI;
 132         msg->address_lo = MSI_ADDR_BASE_LO |
 133                           MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
 134         msg->data = 0;
 135 }
 136
 137 /*
 138  * We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the IRQ mask/unmask ops.
 139  */
 140 static void vmd_irq_enable(struct irq_data *data)
 141 {
 142         struct vmd_irq *vmdirq = data->chip_data;
 143         unsigned long flags;
 144
 145         raw_spin_lock_irqsave(&list_lock, flags);
 146         WARN_ON(vmdirq->enabled);
 147         list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
 148         vmdirq->enabled = true;
 149         raw_spin_unlock_irqrestore(&list_lock, flags);
 150
 151         data->chip->irq_unmask(data);
 152 }
 153
 154 static void vmd_irq_disable(struct irq_data *data)
 155 {
 156         struct vmd_irq *vmdirq = data->chip_data;
 157         unsigned long flags;
 158
 159         data->chip->irq_mask(data);
 160
 161         raw_spin_lock_irqsave(&list_lock, flags);
 162         if (vmdirq->enabled) {
 163                 list_del_rcu(&vmdirq->node);
 164                 vmdirq->enabled = false;
 165         }
 166         raw_spin_unlock_irqrestore(&list_lock, flags);
 167 }
 168
 169 /*
 170  * XXX: Stubbed until we develop acceptable way to not create conflicts with
 171  * other devices sharing the same vector.
 172  */
 173 static int vmd_irq_set_affinity(struct irq_data *data,
 174                                 const struct cpumask *dest, bool force)
 175 {
 176         return -EINVAL;
 177 }
 178
 179 static struct irq_chip vmd_msi_controller = {
 180         .name                   = "VMD-MSI",
 181         .irq_enable             = vmd_irq_enable,
 182         .irq_disable            = vmd_irq_disable,
 183         .irq_compose_msi_msg    = vmd_compose_msi_msg,
 184         .irq_set_affinity       = vmd_irq_set_affinity,
 185 };
 186
 187 static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
 188                                      msi_alloc_info_t *arg)
 189 {
 190         return 0;
 191 }
 192
 193 /*
 194  * XXX: We can be even smarter selecting the best IRQ once we solve the
 195  * affinity problem.
 196  */
 197 static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc)
 198 {
 199         int i, best = 1;
 200         unsigned long flags;
 201
 202         if (vmd->msix_count == 1)
 203                 return &vmd->irqs[0];
 204
 205         /*
 206          * White list for fast-interrupt handlers. All others will share the
 207          * "slow" interrupt vector.
 208          */
 209         switch (msi_desc_to_pci_dev(desc)->class) {
 210         case PCI_CLASS_STORAGE_EXPRESS:
 211                 break;
 212         default:
 213                 return &vmd->irqs[0];
 214         }
 215
 216         raw_spin_lock_irqsave(&list_lock, flags);
 217         for (i = 1; i < vmd->msix_count; i++)
 218                 if (vmd->irqs[i].count < vmd->irqs[best].count)
 219                         best = i;
 220         vmd->irqs[best].count++;
 221         raw_spin_unlock_irqrestore(&list_lock, flags);
 222
 223         return &vmd->irqs[best];
 224 }
 225
 226 static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
 227                         unsigned int virq, irq_hw_number_t hwirq,
 228                         msi_alloc_info_t *arg)
 229 {
 230         struct msi_desc *desc = arg->desc;
 231         struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus);
 232         struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
 233         unsigned int index, vector;
 234
 235         if (!vmdirq)
 236                 return -ENOMEM;
 237
 238         INIT_LIST_HEAD(&vmdirq->node);
 239         vmdirq->irq = vmd_next_irq(vmd, desc);
 240         vmdirq->virq = virq;
 241         index = index_from_irqs(vmd, vmdirq->irq);
 242         vector = pci_irq_vector(vmd->dev, index);
 243
 244         irq_domain_set_info(domain, virq, vector, info->chip, vmdirq,
 245                             handle_untracked_irq, vmd, NULL);
 246         return 0;
 247 }
 248
 249 static void vmd_msi_free(struct irq_domain *domain,
 250                         struct msi_domain_info *info, unsigned int virq)
 251 {
 252         struct vmd_irq *vmdirq = irq_get_chip_data(virq);
 253         unsigned long flags;
 254
 255         synchronize_srcu(&vmdirq->irq->srcu);
 256
 257         /* XXX: Potential optimization to rebalance */
 258         raw_spin_lock_irqsave(&list_lock, flags);
 259         vmdirq->irq->count--;
 260         raw_spin_unlock_irqrestore(&list_lock, flags);
 261
 262         kfree(vmdirq);
 263 }
 264
 265 static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
 266                            int nvec, msi_alloc_info_t *arg)
 267 {
 268         struct pci_dev *pdev = to_pci_dev(dev);
 269         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 270
 271         if (nvec > vmd->msix_count)
 272                 return vmd->msix_count;
 273
 274         memset(arg, 0, sizeof(*arg));
 275         return 0;
 276 }
 277
 278 static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 279 {
 280         arg->desc = desc;
 281 }
 282
 283 static struct msi_domain_ops vmd_msi_domain_ops = {
 284         .get_hwirq      = vmd_get_hwirq,
 285         .msi_init       = vmd_msi_init,
 286         .msi_free       = vmd_msi_free,
 287         .msi_prepare    = vmd_msi_prepare,
 288         .set_desc       = vmd_set_desc,
 289 };
 290
 291 static struct msi_domain_info vmd_msi_domain_info = {
 292         .flags          = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 293                           MSI_FLAG_PCI_MSIX,
 294         .ops            = &vmd_msi_domain_ops,
 295         .chip           = &vmd_msi_controller,
 296 };
 297
 298 /*
 299  * VMD replaces the requester ID with its own.  DMA mappings for devices in a
 300  * VMD domain need to be mapped for the VMD, not the device requiring
 301  * the mapping.
 302  */
 303 static struct device *to_vmd_dev(struct device *dev)
 304 {
 305         struct pci_dev *pdev = to_pci_dev(dev);
 306         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 307
 308         return &vmd->dev->dev;
 309 }
 310
 311 static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
 312                        gfp_t flag, unsigned long attrs)
 313 {
 314         return dma_alloc_attrs(to_vmd_dev(dev), size, addr, flag, attrs);
 315 }
 316
 317 static void vmd_free(struct device *dev, size_t size, void *vaddr,
 318                      dma_addr_t addr, unsigned long attrs)
 319 {
 320         return dma_free_attrs(to_vmd_dev(dev), size, vaddr, addr, attrs);
 321 }
 322
 323 static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
 324                     void *cpu_addr, dma_addr_t addr, size_t size,
 325                     unsigned long attrs)
 326 {
 327         return dma_mmap_attrs(to_vmd_dev(dev), vma, cpu_addr, addr, size,
 328                         attrs);
 329 }
 330
 331 static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
 332                            void *cpu_addr, dma_addr_t addr, size_t size,
 333                            unsigned long attrs)
 334 {
 335         return dma_get_sgtable_attrs(to_vmd_dev(dev), sgt, cpu_addr, addr, size,
 336                         attrs);
 337 }
 338
 339 static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
 340                                unsigned long offset, size_t size,
 341                                enum dma_data_direction dir,
 342                                unsigned long attrs)
 343 {
 344         return dma_map_page_attrs(to_vmd_dev(dev), page, offset, size, dir,
 345                         attrs);
 346 }
 347
 348 static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
 349                            enum dma_data_direction dir, unsigned long attrs)
 350 {
 351         dma_unmap_page_attrs(to_vmd_dev(dev), addr, size, dir, attrs);
 352 }
 353
 354 static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 355                       enum dma_data_direction dir, unsigned long attrs)
 356 {
 357         return dma_map_sg_attrs(to_vmd_dev(dev), sg, nents, dir, attrs);
 358 }
 359
 360 static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
 361                          enum dma_data_direction dir, unsigned long attrs)
 362 {
 363         dma_unmap_sg_attrs(to_vmd_dev(dev), sg, nents, dir, attrs);
 364 }
 365
 366 static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 367                                     size_t size, enum dma_data_direction dir)
 368 {
 369         dma_sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
 370 }
 371
 372 static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
 373                                        size_t size, enum dma_data_direction dir)
 374 {
 375         dma_sync_single_for_device(to_vmd_dev(dev), addr, size, dir);
 376 }
 377
 378 static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 379                                 int nents, enum dma_data_direction dir)
 380 {
 381         dma_sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
 382 }
 383
 384 static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 385                                    int nents, enum dma_data_direction dir)
 386 {
 387         dma_sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
 388 }
 389
 390 static int vmd_dma_supported(struct device *dev, u64 mask)
 391 {
 392         return dma_supported(to_vmd_dev(dev), mask);
 393 }
 394
 395 static u64 vmd_get_required_mask(struct device *dev)
 396 {
 397         return dma_get_required_mask(to_vmd_dev(dev));
 398 }
 399
 400 static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
 401 {
 402         struct dma_domain *domain = &vmd->dma_domain;
 403
 404         if (get_dma_ops(&vmd->dev->dev))
 405                 del_dma_domain(domain);
 406 }
 407
 408 #define ASSIGN_VMD_DMA_OPS(source, dest, fn)    \
 409         do {                                    \
 410                 if (source->fn)                 \
 411                         dest->fn = vmd_##fn;    \
 412         } while (0)
 413
 414 static void vmd_setup_dma_ops(struct vmd_dev *vmd)
 415 {
 416         const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
 417         struct dma_map_ops *dest = &vmd->dma_ops;
 418         struct dma_domain *domain = &vmd->dma_domain;
 419
 420         domain->domain_nr = vmd->sysdata.domain;
 421         domain->dma_ops = dest;
 422
 423         if (!source)
 424                 return;
 425         ASSIGN_VMD_DMA_OPS(source, dest, alloc);
 426         ASSIGN_VMD_DMA_OPS(source, dest, free);
 427         ASSIGN_VMD_DMA_OPS(source, dest, mmap);
 428         ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
 429         ASSIGN_VMD_DMA_OPS(source, dest, map_page);
 430         ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
 431         ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
 432         ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
 433         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
 434         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
 435         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
 436         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
 437         ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
 438         ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
 439         add_dma_domain(domain);
 440 }
 441 #undef ASSIGN_VMD_DMA_OPS
 442
 443 static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
 444                                   unsigned int devfn, int reg, int len)
 445 {
 446         char __iomem *addr = vmd->cfgbar +
 447                              ((bus->number - vmd->busn_start) << 20) +
 448                              (devfn << 12) + reg;
 449
 450         if ((addr - vmd->cfgbar) + len >=
 451             resource_size(&vmd->dev->resource[VMD_CFGBAR]))
 452                 return NULL;
 453
 454         return addr;
 455 }
 456
 457 /*
 458  * CPU may deadlock if config space is not serialized on some versions of this
 459  * hardware, so all config space access is done under a spinlock.
 460  */
 461 static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
 462                         int len, u32 *value)
 463 {
 464         struct vmd_dev *vmd = vmd_from_bus(bus);
 465         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 466         unsigned long flags;
 467         int ret = 0;
 468
 469         if (!addr)
 470                 return -EFAULT;
 471
 472         spin_lock_irqsave(&vmd->cfg_lock, flags);
 473         switch (len) {
 474         case 1:
 475                 *value = readb(addr);
 476                 break;
 477         case 2:
 478                 *value = readw(addr);
 479                 break;
 480         case 4:
 481                 *value = readl(addr);
 482                 break;
 483         default:
 484                 ret = -EINVAL;
 485                 break;
 486         }
 487         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 488         return ret;
 489 }
 490
 491 /*
 492  * VMD h/w converts non-posted config writes to posted memory writes. The
 493  * read-back in this function forces the completion so it returns only after
 494  * the config space was written, as expected.
 495  */
 496 static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
 497                          int len, u32 value)
 498 {
 499         struct vmd_dev *vmd = vmd_from_bus(bus);
 500         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 501         unsigned long flags;
 502         int ret = 0;
 503
 504         if (!addr)
 505                 return -EFAULT;
 506
 507         spin_lock_irqsave(&vmd->cfg_lock, flags);
 508         switch (len) {
 509         case 1:
 510                 writeb(value, addr);
 511                 readb(addr);
 512                 break;
 513         case 2:
 514                 writew(value, addr);
 515                 readw(addr);
 516                 break;
 517         case 4:
 518                 writel(value, addr);
 519                 readl(addr);
 520                 break;
 521         default:
 522                 ret = -EINVAL;
 523                 break;
 524         }
 525         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 526         return ret;
 527 }
 528
 529 static struct pci_ops vmd_ops = {
 530         .read           = vmd_pci_read,
 531         .write          = vmd_pci_write,
 532 };
 533
 534 static void vmd_attach_resources(struct vmd_dev *vmd)
 535 {
 536         vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
 537         vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
 538 }
 539
 540 static void vmd_detach_resources(struct vmd_dev *vmd)
 541 {
 542         vmd->dev->resource[VMD_MEMBAR1].child = NULL;
 543         vmd->dev->resource[VMD_MEMBAR2].child = NULL;
 544 }
 545
 546 /*
 547  * VMD domains start at 0x10000 to not clash with ACPI _SEG domains.
 548  * Per ACPI r6.0, sec 6.5.6,  _SEG returns an integer, of which the lower
 549  * 16 bits are the PCI Segment Group (domain) number.  Other bits are
 550  * currently reserved.
 551  */
 552 static int vmd_find_free_domain(void)
 553 {
 554         int domain = 0xffff;
 555         struct pci_bus *bus = NULL;
 556
 557         while ((bus = pci_find_next_bus(bus)) != NULL)
 558                 domain = max_t(int, domain, pci_domain_nr(bus));
 559         return domain + 1;
 560 }
 561
 562 static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 563 {
 564         struct pci_sysdata *sd = &vmd->sysdata;
 565         struct fwnode_handle *fn;
 566         struct resource *res;
 567         u32 upper_bits;
 568         unsigned long flags;
 569         LIST_HEAD(resources);
 570         resource_size_t offset[2] = {0};
 571         resource_size_t membar2_offset = 0x2000;
 572         struct pci_bus *child;
 573
 574         /*
 575          * Shadow registers may exist in certain VMD device ids which allow
 576          * guests to correctly assign host physical addresses to the root ports
 577          * and child devices. These registers will either return the host value
 578          * or 0, depending on an enable bit in the VMD device.
 579          */
 580         if (features & VMD_FEAT_HAS_MEMBAR_SHADOW) {
 581                 u32 vmlock;
 582                 int ret;
 583
 584                 membar2_offset = MB2_SHADOW_OFFSET + MB2_SHADOW_SIZE;
 585                 ret = pci_read_config_dword(vmd->dev, PCI_REG_VMLOCK, &vmlock);
 586                 if (ret || vmlock == ~0)
 587                         return -ENODEV;
 588
 589                 if (MB2_SHADOW_EN(vmlock)) {
 590                         void __iomem *membar2;
 591
 592                         membar2 = pci_iomap(vmd->dev, VMD_MEMBAR2, 0);
 593                         if (!membar2)
 594                                 return -ENOMEM;
 595                         offset[0] = vmd->dev->resource[VMD_MEMBAR1].start -
 596                                         readq(membar2 + MB2_SHADOW_OFFSET);
 597                         offset[1] = vmd->dev->resource[VMD_MEMBAR2].start -
 598                                         readq(membar2 + MB2_SHADOW_OFFSET + 8);
 599                         pci_iounmap(vmd->dev, membar2);
 600                 }
 601         }
 602
 603         /*
 604          * Certain VMD devices may have a root port configuration option which
 605          * limits the bus range to between 0-127 or 128-255
 606          */
 607         if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {
 608                 u32 vmcap, vmconfig;
 609
 610                 pci_read_config_dword(vmd->dev, PCI_REG_VMCAP, &vmcap);
 611                 pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig);
 612                 if (BUS_RESTRICT_CAP(vmcap) &&
 613                     (BUS_RESTRICT_CFG(vmconfig) == 0x1))
 614                         vmd->busn_start = 128;
 615         }
 616
 617         res = &vmd->dev->resource[VMD_CFGBAR];
 618         vmd->resources[0] = (struct resource) {
 619                 .name  = "VMD CFGBAR",
 620                 .start = vmd->busn_start,
 621                 .end   = vmd->busn_start + (resource_size(res) >> 20) - 1,
 622                 .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
 623         };
 624
 625         /*
 626          * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
 627          * put 32-bit resources in the window.
 628          *
 629          * There's no hardware reason why a 64-bit window *couldn't*
 630          * contain a 32-bit resource, but pbus_size_mem() computes the
 631          * bridge window size assuming a 64-bit window will contain no
 632          * 32-bit resources.  __pci_assign_resource() enforces that
 633          * artificial restriction to make sure everything will fit.
 634          *
 635          * The only way we could use a 64-bit non-prefetchable MEMBAR is
 636          * if its address is <4GB so that we can convert it to a 32-bit
 637          * resource.  To be visible to the host OS, all VMD endpoints must
 638          * be initially configured by platform BIOS, which includes setting
 639          * up these resources.  We can assume the device is configured
 640          * according to the platform needs.
 641          */
 642         res = &vmd->dev->resource[VMD_MEMBAR1];
 643         upper_bits = upper_32_bits(res->end);
 644         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 645         if (!upper_bits)
 646                 flags &= ~IORESOURCE_MEM_64;
 647         vmd->resources[1] = (struct resource) {
 648                 .name  = "VMD MEMBAR1",
 649                 .start = res->start,
 650                 .end   = res->end,
 651                 .flags = flags,
 652                 .parent = res,
 653         };
 654
 655         res = &vmd->dev->resource[VMD_MEMBAR2];
 656         upper_bits = upper_32_bits(res->end);
 657         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 658         if (!upper_bits)
 659                 flags &= ~IORESOURCE_MEM_64;
 660         vmd->resources[2] = (struct resource) {
 661                 .name  = "VMD MEMBAR2",
 662                 .start = res->start + membar2_offset,
 663                 .end   = res->end,
 664                 .flags = flags,
 665                 .parent = res,
 666         };
 667
 668         sd->vmd_domain = true;
 669         sd->domain = vmd_find_free_domain();
 670         if (sd->domain < 0)
 671                 return sd->domain;
 672
 673         sd->node = pcibus_to_node(vmd->dev->bus);
 674
 675         fn = irq_domain_alloc_named_id_fwnode("VMD-MSI", vmd->sysdata.domain);
 676         if (!fn)
 677                 return -ENODEV;
 678
 679         vmd->irq_domain = pci_msi_create_irq_domain(fn, &vmd_msi_domain_info,
 680                                                     x86_vector_domain);
 681         irq_domain_free_fwnode(fn);
 682         if (!vmd->irq_domain)
 683                 return -ENODEV;
 684
 685         pci_add_resource(&resources, &vmd->resources[0]);
 686         pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
 687         pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
 688
 689         vmd->bus = pci_create_root_bus(&vmd->dev->dev, vmd->busn_start,
 690                                        &vmd_ops, sd, &resources);
 691         if (!vmd->bus) {
 692                 pci_free_resource_list(&resources);
 693                 irq_domain_remove(vmd->irq_domain);
 694                 return -ENODEV;
 695         }
 696
 697         vmd_attach_resources(vmd);
 698         vmd_setup_dma_ops(vmd);
 699         dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
 700
 701         pci_scan_child_bus(vmd->bus);
 702         pci_assign_unassigned_bus_resources(vmd->bus);
 703
 704         /*
 705          * VMD root buses are virtual and don't return true on pci_is_pcie()
 706          * and will fail pcie_bus_configure_settings() early. It can instead be
 707          * run on each of the real root ports.
 708          */
 709         list_for_each_entry(child, &vmd->bus->children, node)
 710                 pcie_bus_configure_settings(child);
 711
 712         pci_bus_add_devices(vmd->bus);
 713
 714         WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
 715                                "domain"), "Can't create symlink to domain\n");
 716         return 0;
 717 }
 718
 719 static irqreturn_t vmd_irq(int irq, void *data)
 720 {
 721         struct vmd_irq_list *irqs = data;
 722         struct vmd_irq *vmdirq;
 723         int idx;
 724
 725         idx = srcu_read_lock(&irqs->srcu);
 726         list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
 727                 generic_handle_irq(vmdirq->virq);
 728         srcu_read_unlock(&irqs->srcu, idx);
 729
 730         return IRQ_HANDLED;
 731 }
 732
 733 static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
 734 {
 735         struct vmd_dev *vmd;
 736         int i, err;
 737
 738         if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
 739                 return -ENOMEM;
 740
 741         vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
 742         if (!vmd)
 743                 return -ENOMEM;
 744
 745         vmd->dev = dev;
 746         err = pcim_enable_device(dev);
 747         if (err < 0)
 748                 return err;
 749
 750         vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
 751         if (!vmd->cfgbar)
 752                 return -ENOMEM;
 753
 754         pci_set_master(dev);
 755         if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
 756             dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
 757                 return -ENODEV;
 758
 759         vmd->msix_count = pci_msix_vec_count(dev);
 760         if (vmd->msix_count < 0)
 761                 return -ENODEV;
 762
 763         vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
 764                                         PCI_IRQ_MSIX);
 765         if (vmd->msix_count < 0)
 766                 return vmd->msix_count;
 767
 768         vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
 769                                  GFP_KERNEL);
 770         if (!vmd->irqs)
 771                 return -ENOMEM;
 772
 773         for (i = 0; i < vmd->msix_count; i++) {
 774                 err = init_srcu_struct(&vmd->irqs[i].srcu);
 775                 if (err)
 776                         return err;
 777
 778                 INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
 779                 err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
 780                                        vmd_irq, IRQF_NO_THREAD,
 781                                        "vmd", &vmd->irqs[i]);
 782                 if (err)
 783                         return err;
 784         }
 785
 786         spin_lock_init(&vmd->cfg_lock);
 787         pci_set_drvdata(dev, vmd);
 788         err = vmd_enable_domain(vmd, (unsigned long) id->driver_data);
 789         if (err)
 790                 return err;
 791
 792         dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
 793                  vmd->sysdata.domain);
 794         return 0;
 795 }
 796
 797 static void vmd_cleanup_srcu(struct vmd_dev *vmd)
 798 {
 799         int i;
 800
 801         for (i = 0; i < vmd->msix_count; i++)
 802                 cleanup_srcu_struct(&vmd->irqs[i].srcu);
 803 }
 804
 805 static void vmd_remove(struct pci_dev *dev)
 806 {
 807         struct vmd_dev *vmd = pci_get_drvdata(dev);
 808
 809         sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
 810         pci_stop_root_bus(vmd->bus);
 811         pci_remove_root_bus(vmd->bus);
 812         vmd_cleanup_srcu(vmd);
 813         vmd_teardown_dma_ops(vmd);
 814         vmd_detach_resources(vmd);
 815         irq_domain_remove(vmd->irq_domain);
 816 }
 817
 818 #ifdef CONFIG_PM_SLEEP
 819 static int vmd_suspend(struct device *dev)
 820 {
 821         struct pci_dev *pdev = to_pci_dev(dev);
 822         struct vmd_dev *vmd = pci_get_drvdata(pdev);
 823         int i;
 824
 825         for (i = 0; i < vmd->msix_count; i++)
 826                 devm_free_irq(dev, pci_irq_vector(pdev, i), &vmd->irqs[i]);
 827
 828         pci_save_state(pdev);
 829         return 0;
 830 }
 831
 832 static int vmd_resume(struct device *dev)
 833 {
 834         struct pci_dev *pdev = to_pci_dev(dev);
 835         struct vmd_dev *vmd = pci_get_drvdata(pdev);
 836         int err, i;
 837
 838         for (i = 0; i < vmd->msix_count; i++) {
 839                 err = devm_request_irq(dev, pci_irq_vector(pdev, i),
 840                                        vmd_irq, IRQF_NO_THREAD,
 841                                        "vmd", &vmd->irqs[i]);
 842                 if (err)
 843                         return err;
 844         }
 845
 846         pci_restore_state(pdev);
 847         return 0;
 848 }
 849 #endif
 850 static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
 851
 852 static const struct pci_device_id vmd_ids[] = {
 853         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),},
 854         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
 855                 .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
 856                                 VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 857         {0,}
 858 };
 859 MODULE_DEVICE_TABLE(pci, vmd_ids);
 860
 861 static struct pci_driver vmd_drv = {
 862         .name           = "vmd",
 863         .id_table       = vmd_ids,
 864         .probe          = vmd_probe,
 865         .remove         = vmd_remove,
 866         .driver         = {
 867                 .pm     = &vmd_dev_pm_ops,
 868         },
 869 };
 870 module_pci_driver(vmd_drv);
 871
 872 MODULE_AUTHOR("Intel Corporation");
 873 MODULE_LICENSE("GPL v2");
 874 MODULE_VERSION("0.6");