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 enum vmd_features {
  35         /*
  36          * Device may contain registers which hint the physical location of the
  37          * membars, in order to allow proper address translation during
  38          * resource assignment to enable guest virtualization
  39          */
  40         VMD_FEAT_HAS_MEMBAR_SHADOW      = (1 << 0),
  41
  42         /*
  43          * Device may provide root port configuration information which limits
  44          * bus numbering
  45          */
  46         VMD_FEAT_HAS_BUS_RESTRICTIONS   = (1 << 1),
  47 };
  48
  49 /*
  50  * Lock for manipulating VMD IRQ lists.
  51  */
  52 static DEFINE_RAW_SPINLOCK(list_lock);
  53
  54 /**
  55  * struct vmd_irq - private data to map driver IRQ to the VMD shared vector
  56  * @node:       list item for parent traversal.
  57  * @irq:        back pointer to parent.
  58  * @enabled:    true if driver enabled IRQ
  59  * @virq:       the virtual IRQ value provided to the requesting driver.
  60  *
  61  * Every MSI/MSI-X IRQ requested for a device in a VMD domain will be mapped to
  62  * a VMD IRQ using this structure.
  63  */
  64 struct vmd_irq {
  65         struct list_head        node;
  66         struct vmd_irq_list     *irq;
  67         bool                    enabled;
  68         unsigned int            virq;
  69 };
  70
  71 /**
  72  * struct vmd_irq_list - list of driver requested IRQs mapping to a VMD vector
  73  * @irq_list:   the list of irq's the VMD one demuxes to.
  74  * @srcu:       SRCU struct for local synchronization.
  75  * @count:      number of child IRQs assigned to this vector; used to track
  76  *              sharing.
  77  */
  78 struct vmd_irq_list {
  79         struct list_head        irq_list;
  80         struct srcu_struct      srcu;
  81         unsigned int            count;
  82 };
  83
  84 struct vmd_dev {
  85         struct pci_dev          *dev;
  86
  87         spinlock_t              cfg_lock;
  88         char __iomem            *cfgbar;
  89
  90         int msix_count;
  91         struct vmd_irq_list     *irqs;
  92
  93         struct pci_sysdata      sysdata;
  94         struct resource         resources[3];
  95         struct irq_domain       *irq_domain;
  96         struct pci_bus          *bus;
  97
  98 #ifdef CONFIG_X86_DEV_DMA_OPS
  99         struct dma_map_ops      dma_ops;
 100         struct dma_domain       dma_domain;
 101 #endif
 102 };
 103
 104 static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus)
 105 {
 106         return container_of(bus->sysdata, struct vmd_dev, sysdata);
 107 }
 108
 109 static inline unsigned int index_from_irqs(struct vmd_dev *vmd,
 110                                            struct vmd_irq_list *irqs)
 111 {
 112         return irqs - vmd->irqs;
 113 }
 114
 115 /*
 116  * Drivers managing a device in a VMD domain allocate their own IRQs as before,
 117  * but the MSI entry for the hardware it's driving will be programmed with a
 118  * destination ID for the VMD MSI-X table.  The VMD muxes interrupts in its
 119  * domain into one of its own, and the VMD driver de-muxes these for the
 120  * handlers sharing that VMD IRQ.  The vmd irq_domain provides the operations
 121  * and irq_chip to set this up.
 122  */
 123 static void vmd_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 124 {
 125         struct vmd_irq *vmdirq = data->chip_data;
 126         struct vmd_irq_list *irq = vmdirq->irq;
 127         struct vmd_dev *vmd = irq_data_get_irq_handler_data(data);
 128
 129         msg->address_hi = MSI_ADDR_BASE_HI;
 130         msg->address_lo = MSI_ADDR_BASE_LO |
 131                           MSI_ADDR_DEST_ID(index_from_irqs(vmd, irq));
 132         msg->data = 0;
 133 }
 134
 135 /*
 136  * We rely on MSI_FLAG_USE_DEF_CHIP_OPS to set the IRQ mask/unmask ops.
 137  */
 138 static void vmd_irq_enable(struct irq_data *data)
 139 {
 140         struct vmd_irq *vmdirq = data->chip_data;
 141         unsigned long flags;
 142
 143         raw_spin_lock_irqsave(&list_lock, flags);
 144         WARN_ON(vmdirq->enabled);
 145         list_add_tail_rcu(&vmdirq->node, &vmdirq->irq->irq_list);
 146         vmdirq->enabled = true;
 147         raw_spin_unlock_irqrestore(&list_lock, flags);
 148
 149         data->chip->irq_unmask(data);
 150 }
 151
 152 static void vmd_irq_disable(struct irq_data *data)
 153 {
 154         struct vmd_irq *vmdirq = data->chip_data;
 155         unsigned long flags;
 156
 157         data->chip->irq_mask(data);
 158
 159         raw_spin_lock_irqsave(&list_lock, flags);
 160         if (vmdirq->enabled) {
 161                 list_del_rcu(&vmdirq->node);
 162                 vmdirq->enabled = false;
 163         }
 164         raw_spin_unlock_irqrestore(&list_lock, flags);
 165 }
 166
 167 /*
 168  * XXX: Stubbed until we develop acceptable way to not create conflicts with
 169  * other devices sharing the same vector.
 170  */
 171 static int vmd_irq_set_affinity(struct irq_data *data,
 172                                 const struct cpumask *dest, bool force)
 173 {
 174         return -EINVAL;
 175 }
 176
 177 static struct irq_chip vmd_msi_controller = {
 178         .name                   = "VMD-MSI",
 179         .irq_enable             = vmd_irq_enable,
 180         .irq_disable            = vmd_irq_disable,
 181         .irq_compose_msi_msg    = vmd_compose_msi_msg,
 182         .irq_set_affinity       = vmd_irq_set_affinity,
 183 };
 184
 185 static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info,
 186                                      msi_alloc_info_t *arg)
 187 {
 188         return 0;
 189 }
 190
 191 /*
 192  * XXX: We can be even smarter selecting the best IRQ once we solve the
 193  * affinity problem.
 194  */
 195 static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc)
 196 {
 197         int i, best = 1;
 198         unsigned long flags;
 199
 200         if (vmd->msix_count == 1)
 201                 return &vmd->irqs[0];
 202
 203         /*
 204          * White list for fast-interrupt handlers. All others will share the
 205          * "slow" interrupt vector.
 206          */
 207         switch (msi_desc_to_pci_dev(desc)->class) {
 208         case PCI_CLASS_STORAGE_EXPRESS:
 209                 break;
 210         default:
 211                 return &vmd->irqs[0];
 212         }
 213
 214         raw_spin_lock_irqsave(&list_lock, flags);
 215         for (i = 1; i < vmd->msix_count; i++)
 216                 if (vmd->irqs[i].count < vmd->irqs[best].count)
 217                         best = i;
 218         vmd->irqs[best].count++;
 219         raw_spin_unlock_irqrestore(&list_lock, flags);
 220
 221         return &vmd->irqs[best];
 222 }
 223
 224 static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info,
 225                         unsigned int virq, irq_hw_number_t hwirq,
 226                         msi_alloc_info_t *arg)
 227 {
 228         struct msi_desc *desc = arg->desc;
 229         struct vmd_dev *vmd = vmd_from_bus(msi_desc_to_pci_dev(desc)->bus);
 230         struct vmd_irq *vmdirq = kzalloc(sizeof(*vmdirq), GFP_KERNEL);
 231         unsigned int index, vector;
 232
 233         if (!vmdirq)
 234                 return -ENOMEM;
 235
 236         INIT_LIST_HEAD(&vmdirq->node);
 237         vmdirq->irq = vmd_next_irq(vmd, desc);
 238         vmdirq->virq = virq;
 239         index = index_from_irqs(vmd, vmdirq->irq);
 240         vector = pci_irq_vector(vmd->dev, index);
 241
 242         irq_domain_set_info(domain, virq, vector, info->chip, vmdirq,
 243                             handle_untracked_irq, vmd, NULL);
 244         return 0;
 245 }
 246
 247 static void vmd_msi_free(struct irq_domain *domain,
 248                         struct msi_domain_info *info, unsigned int virq)
 249 {
 250         struct vmd_irq *vmdirq = irq_get_chip_data(virq);
 251         unsigned long flags;
 252
 253         synchronize_srcu(&vmdirq->irq->srcu);
 254
 255         /* XXX: Potential optimization to rebalance */
 256         raw_spin_lock_irqsave(&list_lock, flags);
 257         vmdirq->irq->count--;
 258         raw_spin_unlock_irqrestore(&list_lock, flags);
 259
 260         kfree(vmdirq);
 261 }
 262
 263 static int vmd_msi_prepare(struct irq_domain *domain, struct device *dev,
 264                            int nvec, msi_alloc_info_t *arg)
 265 {
 266         struct pci_dev *pdev = to_pci_dev(dev);
 267         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 268
 269         if (nvec > vmd->msix_count)
 270                 return vmd->msix_count;
 271
 272         memset(arg, 0, sizeof(*arg));
 273         return 0;
 274 }
 275
 276 static void vmd_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 277 {
 278         arg->desc = desc;
 279 }
 280
 281 static struct msi_domain_ops vmd_msi_domain_ops = {
 282         .get_hwirq      = vmd_get_hwirq,
 283         .msi_init       = vmd_msi_init,
 284         .msi_free       = vmd_msi_free,
 285         .msi_prepare    = vmd_msi_prepare,
 286         .set_desc       = vmd_set_desc,
 287 };
 288
 289 static struct msi_domain_info vmd_msi_domain_info = {
 290         .flags          = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
 291                           MSI_FLAG_PCI_MSIX,
 292         .ops            = &vmd_msi_domain_ops,
 293         .chip           = &vmd_msi_controller,
 294 };
 295
 296 #ifdef CONFIG_X86_DEV_DMA_OPS
 297 /*
 298  * VMD replaces the requester ID with its own.  DMA mappings for devices in a
 299  * VMD domain need to be mapped for the VMD, not the device requiring
 300  * the mapping.
 301  */
 302 static struct device *to_vmd_dev(struct device *dev)
 303 {
 304         struct pci_dev *pdev = to_pci_dev(dev);
 305         struct vmd_dev *vmd = vmd_from_bus(pdev->bus);
 306
 307         return &vmd->dev->dev;
 308 }
 309
 310 static const struct dma_map_ops *vmd_dma_ops(struct device *dev)
 311 {
 312         return get_dma_ops(to_vmd_dev(dev));
 313 }
 314
 315 static void *vmd_alloc(struct device *dev, size_t size, dma_addr_t *addr,
 316                        gfp_t flag, unsigned long attrs)
 317 {
 318         return vmd_dma_ops(dev)->alloc(to_vmd_dev(dev), size, addr, flag,
 319                                        attrs);
 320 }
 321
 322 static void vmd_free(struct device *dev, size_t size, void *vaddr,
 323                      dma_addr_t addr, unsigned long attrs)
 324 {
 325         return vmd_dma_ops(dev)->free(to_vmd_dev(dev), size, vaddr, addr,
 326                                       attrs);
 327 }
 328
 329 static int vmd_mmap(struct device *dev, struct vm_area_struct *vma,
 330                     void *cpu_addr, dma_addr_t addr, size_t size,
 331                     unsigned long attrs)
 332 {
 333         return vmd_dma_ops(dev)->mmap(to_vmd_dev(dev), vma, cpu_addr, addr,
 334                                       size, attrs);
 335 }
 336
 337 static int vmd_get_sgtable(struct device *dev, struct sg_table *sgt,
 338                            void *cpu_addr, dma_addr_t addr, size_t size,
 339                            unsigned long attrs)
 340 {
 341         return vmd_dma_ops(dev)->get_sgtable(to_vmd_dev(dev), sgt, cpu_addr,
 342                                              addr, size, attrs);
 343 }
 344
 345 static dma_addr_t vmd_map_page(struct device *dev, struct page *page,
 346                                unsigned long offset, size_t size,
 347                                enum dma_data_direction dir,
 348                                unsigned long attrs)
 349 {
 350         return vmd_dma_ops(dev)->map_page(to_vmd_dev(dev), page, offset, size,
 351                                           dir, attrs);
 352 }
 353
 354 static void vmd_unmap_page(struct device *dev, dma_addr_t addr, size_t size,
 355                            enum dma_data_direction dir, unsigned long attrs)
 356 {
 357         vmd_dma_ops(dev)->unmap_page(to_vmd_dev(dev), addr, size, dir, attrs);
 358 }
 359
 360 static int vmd_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 361                       enum dma_data_direction dir, unsigned long attrs)
 362 {
 363         return vmd_dma_ops(dev)->map_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
 364 }
 365
 366 static void vmd_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
 367                          enum dma_data_direction dir, unsigned long attrs)
 368 {
 369         vmd_dma_ops(dev)->unmap_sg(to_vmd_dev(dev), sg, nents, dir, attrs);
 370 }
 371
 372 static void vmd_sync_single_for_cpu(struct device *dev, dma_addr_t addr,
 373                                     size_t size, enum dma_data_direction dir)
 374 {
 375         vmd_dma_ops(dev)->sync_single_for_cpu(to_vmd_dev(dev), addr, size, dir);
 376 }
 377
 378 static void vmd_sync_single_for_device(struct device *dev, dma_addr_t addr,
 379                                        size_t size, enum dma_data_direction dir)
 380 {
 381         vmd_dma_ops(dev)->sync_single_for_device(to_vmd_dev(dev), addr, size,
 382                                                  dir);
 383 }
 384
 385 static void vmd_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
 386                                 int nents, enum dma_data_direction dir)
 387 {
 388         vmd_dma_ops(dev)->sync_sg_for_cpu(to_vmd_dev(dev), sg, nents, dir);
 389 }
 390
 391 static void vmd_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
 392                                    int nents, enum dma_data_direction dir)
 393 {
 394         vmd_dma_ops(dev)->sync_sg_for_device(to_vmd_dev(dev), sg, nents, dir);
 395 }
 396
 397 static int vmd_mapping_error(struct device *dev, dma_addr_t addr)
 398 {
 399         return vmd_dma_ops(dev)->mapping_error(to_vmd_dev(dev), addr);
 400 }
 401
 402 static int vmd_dma_supported(struct device *dev, u64 mask)
 403 {
 404         return vmd_dma_ops(dev)->dma_supported(to_vmd_dev(dev), mask);
 405 }
 406
 407 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 408 static u64 vmd_get_required_mask(struct device *dev)
 409 {
 410         return vmd_dma_ops(dev)->get_required_mask(to_vmd_dev(dev));
 411 }
 412 #endif
 413
 414 static void vmd_teardown_dma_ops(struct vmd_dev *vmd)
 415 {
 416         struct dma_domain *domain = &vmd->dma_domain;
 417
 418         if (get_dma_ops(&vmd->dev->dev))
 419                 del_dma_domain(domain);
 420 }
 421
 422 #define ASSIGN_VMD_DMA_OPS(source, dest, fn)    \
 423         do {                                    \
 424                 if (source->fn)                 \
 425                         dest->fn = vmd_##fn;    \
 426         } while (0)
 427
 428 static void vmd_setup_dma_ops(struct vmd_dev *vmd)
 429 {
 430         const struct dma_map_ops *source = get_dma_ops(&vmd->dev->dev);
 431         struct dma_map_ops *dest = &vmd->dma_ops;
 432         struct dma_domain *domain = &vmd->dma_domain;
 433
 434         domain->domain_nr = vmd->sysdata.domain;
 435         domain->dma_ops = dest;
 436
 437         if (!source)
 438                 return;
 439         ASSIGN_VMD_DMA_OPS(source, dest, alloc);
 440         ASSIGN_VMD_DMA_OPS(source, dest, free);
 441         ASSIGN_VMD_DMA_OPS(source, dest, mmap);
 442         ASSIGN_VMD_DMA_OPS(source, dest, get_sgtable);
 443         ASSIGN_VMD_DMA_OPS(source, dest, map_page);
 444         ASSIGN_VMD_DMA_OPS(source, dest, unmap_page);
 445         ASSIGN_VMD_DMA_OPS(source, dest, map_sg);
 446         ASSIGN_VMD_DMA_OPS(source, dest, unmap_sg);
 447         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_cpu);
 448         ASSIGN_VMD_DMA_OPS(source, dest, sync_single_for_device);
 449         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_cpu);
 450         ASSIGN_VMD_DMA_OPS(source, dest, sync_sg_for_device);
 451         ASSIGN_VMD_DMA_OPS(source, dest, mapping_error);
 452         ASSIGN_VMD_DMA_OPS(source, dest, dma_supported);
 453 #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK
 454         ASSIGN_VMD_DMA_OPS(source, dest, get_required_mask);
 455 #endif
 456         add_dma_domain(domain);
 457 }
 458 #undef ASSIGN_VMD_DMA_OPS
 459 #else
 460 static void vmd_teardown_dma_ops(struct vmd_dev *vmd) {}
 461 static void vmd_setup_dma_ops(struct vmd_dev *vmd) {}
 462 #endif
 463
 464 static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
 465                                   unsigned int devfn, int reg, int len)
 466 {
 467         char __iomem *addr = vmd->cfgbar +
 468                              (bus->number << 20) + (devfn << 12) + reg;
 469
 470         if ((addr - vmd->cfgbar) + len >=
 471             resource_size(&vmd->dev->resource[VMD_CFGBAR]))
 472                 return NULL;
 473
 474         return addr;
 475 }
 476
 477 /*
 478  * CPU may deadlock if config space is not serialized on some versions of this
 479  * hardware, so all config space access is done under a spinlock.
 480  */
 481 static int vmd_pci_read(struct pci_bus *bus, unsigned int devfn, int reg,
 482                         int len, u32 *value)
 483 {
 484         struct vmd_dev *vmd = vmd_from_bus(bus);
 485         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 486         unsigned long flags;
 487         int ret = 0;
 488
 489         if (!addr)
 490                 return -EFAULT;
 491
 492         spin_lock_irqsave(&vmd->cfg_lock, flags);
 493         switch (len) {
 494         case 1:
 495                 *value = readb(addr);
 496                 break;
 497         case 2:
 498                 *value = readw(addr);
 499                 break;
 500         case 4:
 501                 *value = readl(addr);
 502                 break;
 503         default:
 504                 ret = -EINVAL;
 505                 break;
 506         }
 507         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 508         return ret;
 509 }
 510
 511 /*
 512  * VMD h/w converts non-posted config writes to posted memory writes. The
 513  * read-back in this function forces the completion so it returns only after
 514  * the config space was written, as expected.
 515  */
 516 static int vmd_pci_write(struct pci_bus *bus, unsigned int devfn, int reg,
 517                          int len, u32 value)
 518 {
 519         struct vmd_dev *vmd = vmd_from_bus(bus);
 520         char __iomem *addr = vmd_cfg_addr(vmd, bus, devfn, reg, len);
 521         unsigned long flags;
 522         int ret = 0;
 523
 524         if (!addr)
 525                 return -EFAULT;
 526
 527         spin_lock_irqsave(&vmd->cfg_lock, flags);
 528         switch (len) {
 529         case 1:
 530                 writeb(value, addr);
 531                 readb(addr);
 532                 break;
 533         case 2:
 534                 writew(value, addr);
 535                 readw(addr);
 536                 break;
 537         case 4:
 538                 writel(value, addr);
 539                 readl(addr);
 540                 break;
 541         default:
 542                 ret = -EINVAL;
 543                 break;
 544         }
 545         spin_unlock_irqrestore(&vmd->cfg_lock, flags);
 546         return ret;
 547 }
 548
 549 static struct pci_ops vmd_ops = {
 550         .read           = vmd_pci_read,
 551         .write          = vmd_pci_write,
 552 };
 553
 554 static void vmd_attach_resources(struct vmd_dev *vmd)
 555 {
 556         vmd->dev->resource[VMD_MEMBAR1].child = &vmd->resources[1];
 557         vmd->dev->resource[VMD_MEMBAR2].child = &vmd->resources[2];
 558 }
 559
 560 static void vmd_detach_resources(struct vmd_dev *vmd)
 561 {
 562         vmd->dev->resource[VMD_MEMBAR1].child = NULL;
 563         vmd->dev->resource[VMD_MEMBAR2].child = NULL;
 564 }
 565
 566 /*
 567  * VMD domains start at 0x10000 to not clash with ACPI _SEG domains.
 568  * Per ACPI r6.0, sec 6.5.6,  _SEG returns an integer, of which the lower
 569  * 16 bits are the PCI Segment Group (domain) number.  Other bits are
 570  * currently reserved.
 571  */
 572 static int vmd_find_free_domain(void)
 573 {
 574         int domain = 0xffff;
 575         struct pci_bus *bus = NULL;
 576
 577         while ((bus = pci_find_next_bus(bus)) != NULL)
 578                 domain = max_t(int, domain, pci_domain_nr(bus));
 579         return domain + 1;
 580 }
 581
 582 static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
 583 {
 584         struct pci_sysdata *sd = &vmd->sysdata;
 585         struct fwnode_handle *fn;
 586         struct resource *res;
 587         u32 upper_bits;
 588         unsigned long flags;
 589         LIST_HEAD(resources);
 590         resource_size_t offset[2] = {0};
 591         resource_size_t membar2_offset = 0x2000, busn_start = 0;
 592
 593         /*
 594          * Shadow registers may exist in certain VMD device ids which allow
 595          * guests to correctly assign host physical addresses to the root ports
 596          * and child devices. These registers will either return the host value
 597          * or 0, depending on an enable bit in the VMD device.
 598          */
 599         if (features & VMD_FEAT_HAS_MEMBAR_SHADOW) {
 600                 u32 vmlock;
 601                 int ret;
 602
 603                 membar2_offset = 0x2018;
 604                 ret = pci_read_config_dword(vmd->dev, PCI_REG_VMLOCK, &vmlock);
 605                 if (ret || vmlock == ~0)
 606                         return -ENODEV;
 607
 608                 if (MB2_SHADOW_EN(vmlock)) {
 609                         void __iomem *membar2;
 610
 611                         membar2 = pci_iomap(vmd->dev, VMD_MEMBAR2, 0);
 612                         if (!membar2)
 613                                 return -ENOMEM;
 614                         offset[0] = vmd->dev->resource[VMD_MEMBAR1].start -
 615                                                 readq(membar2 + 0x2008);
 616                         offset[1] = vmd->dev->resource[VMD_MEMBAR2].start -
 617                                                 readq(membar2 + 0x2010);
 618                         pci_iounmap(vmd->dev, membar2);
 619                 }
 620         }
 621
 622         /*
 623          * Certain VMD devices may have a root port configuration option which
 624          * limits the bus range to between 0-127 or 128-255
 625          */
 626         if (features & VMD_FEAT_HAS_BUS_RESTRICTIONS) {
 627                 u32 vmcap, vmconfig;
 628
 629                 pci_read_config_dword(vmd->dev, PCI_REG_VMCAP, &vmcap);
 630                 pci_read_config_dword(vmd->dev, PCI_REG_VMCONFIG, &vmconfig);
 631                 if (BUS_RESTRICT_CAP(vmcap) &&
 632                     (BUS_RESTRICT_CFG(vmconfig) == 0x1))
 633                         busn_start = 128;
 634         }
 635
 636         res = &vmd->dev->resource[VMD_CFGBAR];
 637         vmd->resources[0] = (struct resource) {
 638                 .name  = "VMD CFGBAR",
 639                 .start = busn_start,
 640                 .end   = busn_start + (resource_size(res) >> 20) - 1,
 641                 .flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
 642         };
 643
 644         /*
 645          * If the window is below 4GB, clear IORESOURCE_MEM_64 so we can
 646          * put 32-bit resources in the window.
 647          *
 648          * There's no hardware reason why a 64-bit window *couldn't*
 649          * contain a 32-bit resource, but pbus_size_mem() computes the
 650          * bridge window size assuming a 64-bit window will contain no
 651          * 32-bit resources.  __pci_assign_resource() enforces that
 652          * artificial restriction to make sure everything will fit.
 653          *
 654          * The only way we could use a 64-bit non-prefechable MEMBAR is
 655          * if its address is <4GB so that we can convert it to a 32-bit
 656          * resource.  To be visible to the host OS, all VMD endpoints must
 657          * be initially configured by platform BIOS, which includes setting
 658          * up these resources.  We can assume the device is configured
 659          * according to the platform needs.
 660          */
 661         res = &vmd->dev->resource[VMD_MEMBAR1];
 662         upper_bits = upper_32_bits(res->end);
 663         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 664         if (!upper_bits)
 665                 flags &= ~IORESOURCE_MEM_64;
 666         vmd->resources[1] = (struct resource) {
 667                 .name  = "VMD MEMBAR1",
 668                 .start = res->start,
 669                 .end   = res->end,
 670                 .flags = flags,
 671                 .parent = res,
 672         };
 673
 674         res = &vmd->dev->resource[VMD_MEMBAR2];
 675         upper_bits = upper_32_bits(res->end);
 676         flags = res->flags & ~IORESOURCE_SIZEALIGN;
 677         if (!upper_bits)
 678                 flags &= ~IORESOURCE_MEM_64;
 679         vmd->resources[2] = (struct resource) {
 680                 .name  = "VMD MEMBAR2",
 681                 .start = res->start + membar2_offset,
 682                 .end   = res->end,
 683                 .flags = flags,
 684                 .parent = res,
 685         };
 686
 687         sd->vmd_domain = true;
 688         sd->domain = vmd_find_free_domain();
 689         if (sd->domain < 0)
 690                 return sd->domain;
 691
 692         sd->node = pcibus_to_node(vmd->dev->bus);
 693
 694         fn = irq_domain_alloc_named_id_fwnode("VMD-MSI", vmd->sysdata.domain);
 695         if (!fn)
 696                 return -ENODEV;
 697
 698         vmd->irq_domain = pci_msi_create_irq_domain(fn, &vmd_msi_domain_info,
 699                                                     x86_vector_domain);
 700         irq_domain_free_fwnode(fn);
 701         if (!vmd->irq_domain)
 702                 return -ENODEV;
 703
 704         pci_add_resource(&resources, &vmd->resources[0]);
 705         pci_add_resource_offset(&resources, &vmd->resources[1], offset[0]);
 706         pci_add_resource_offset(&resources, &vmd->resources[2], offset[1]);
 707
 708         vmd->bus = pci_create_root_bus(&vmd->dev->dev, busn_start, &vmd_ops,
 709                                        sd, &resources);
 710         if (!vmd->bus) {
 711                 pci_free_resource_list(&resources);
 712                 irq_domain_remove(vmd->irq_domain);
 713                 return -ENODEV;
 714         }
 715
 716         vmd_attach_resources(vmd);
 717         vmd_setup_dma_ops(vmd);
 718         dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
 719         pci_rescan_bus(vmd->bus);
 720
 721         WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
 722                                "domain"), "Can't create symlink to domain\n");
 723         return 0;
 724 }
 725
 726 static irqreturn_t vmd_irq(int irq, void *data)
 727 {
 728         struct vmd_irq_list *irqs = data;
 729         struct vmd_irq *vmdirq;
 730         int idx;
 731
 732         idx = srcu_read_lock(&irqs->srcu);
 733         list_for_each_entry_rcu(vmdirq, &irqs->irq_list, node)
 734                 generic_handle_irq(vmdirq->virq);
 735         srcu_read_unlock(&irqs->srcu, idx);
 736
 737         return IRQ_HANDLED;
 738 }
 739
 740 static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
 741 {
 742         struct vmd_dev *vmd;
 743         int i, err;
 744
 745         if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))
 746                 return -ENOMEM;
 747
 748         vmd = devm_kzalloc(&dev->dev, sizeof(*vmd), GFP_KERNEL);
 749         if (!vmd)
 750                 return -ENOMEM;
 751
 752         vmd->dev = dev;
 753         err = pcim_enable_device(dev);
 754         if (err < 0)
 755                 return err;
 756
 757         vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
 758         if (!vmd->cfgbar)
 759                 return -ENOMEM;
 760
 761         pci_set_master(dev);
 762         if (dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(64)) &&
 763             dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32)))
 764                 return -ENODEV;
 765
 766         vmd->msix_count = pci_msix_vec_count(dev);
 767         if (vmd->msix_count < 0)
 768                 return -ENODEV;
 769
 770         vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count,
 771                                         PCI_IRQ_MSIX);
 772         if (vmd->msix_count < 0)
 773                 return vmd->msix_count;
 774
 775         vmd->irqs = devm_kcalloc(&dev->dev, vmd->msix_count, sizeof(*vmd->irqs),
 776                                  GFP_KERNEL);
 777         if (!vmd->irqs)
 778                 return -ENOMEM;
 779
 780         for (i = 0; i < vmd->msix_count; i++) {
 781                 err = init_srcu_struct(&vmd->irqs[i].srcu);
 782                 if (err)
 783                         return err;
 784
 785                 INIT_LIST_HEAD(&vmd->irqs[i].irq_list);
 786                 err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i),
 787                                        vmd_irq, IRQF_NO_THREAD,
 788                                        "vmd", &vmd->irqs[i]);
 789                 if (err)
 790                         return err;
 791         }
 792
 793         spin_lock_init(&vmd->cfg_lock);
 794         pci_set_drvdata(dev, vmd);
 795         err = vmd_enable_domain(vmd, (unsigned long) id->driver_data);
 796         if (err)
 797                 return err;
 798
 799         dev_info(&vmd->dev->dev, "Bound to PCI domain %04x\n",
 800                  vmd->sysdata.domain);
 801         return 0;
 802 }
 803
 804 static void vmd_cleanup_srcu(struct vmd_dev *vmd)
 805 {
 806         int i;
 807
 808         for (i = 0; i < vmd->msix_count; i++)
 809                 cleanup_srcu_struct(&vmd->irqs[i].srcu);
 810 }
 811
 812 static void vmd_remove(struct pci_dev *dev)
 813 {
 814         struct vmd_dev *vmd = pci_get_drvdata(dev);
 815
 816         vmd_detach_resources(vmd);
 817         sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
 818         pci_stop_root_bus(vmd->bus);
 819         pci_remove_root_bus(vmd->bus);
 820         vmd_cleanup_srcu(vmd);
 821         vmd_teardown_dma_ops(vmd);
 822         irq_domain_remove(vmd->irq_domain);
 823 }
 824
 825 #ifdef CONFIG_PM_SLEEP
 826 static int vmd_suspend(struct device *dev)
 827 {
 828         struct pci_dev *pdev = to_pci_dev(dev);
 829         struct vmd_dev *vmd = pci_get_drvdata(pdev);
 830         int i;
 831
 832         for (i = 0; i < vmd->msix_count; i++)
 833                 devm_free_irq(dev, pci_irq_vector(pdev, i), &vmd->irqs[i]);
 834
 835         pci_save_state(pdev);
 836         return 0;
 837 }
 838
 839 static int vmd_resume(struct device *dev)
 840 {
 841         struct pci_dev *pdev = to_pci_dev(dev);
 842         struct vmd_dev *vmd = pci_get_drvdata(pdev);
 843         int err, i;
 844
 845         for (i = 0; i < vmd->msix_count; i++) {
 846                 err = devm_request_irq(dev, pci_irq_vector(pdev, i),
 847                                        vmd_irq, IRQF_NO_THREAD,
 848                                        "vmd", &vmd->irqs[i]);
 849                 if (err)
 850                         return err;
 851         }
 852
 853         pci_restore_state(pdev);
 854         return 0;
 855 }
 856 #endif
 857 static SIMPLE_DEV_PM_OPS(vmd_dev_pm_ops, vmd_suspend, vmd_resume);
 858
 859 static const struct pci_device_id vmd_ids[] = {
 860         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_201D),},
 861         {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_28C0),
 862                 .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW |
 863                                 VMD_FEAT_HAS_BUS_RESTRICTIONS,},
 864         {0,}
 865 };
 866 MODULE_DEVICE_TABLE(pci, vmd_ids);
 867
 868 static struct pci_driver vmd_drv = {
 869         .name           = "vmd",
 870         .id_table       = vmd_ids,
 871         .probe          = vmd_probe,
 872         .remove         = vmd_remove,
 873         .driver         = {
 874                 .pm     = &vmd_dev_pm_ops,
 875         },
 876 };
 877 module_pci_driver(vmd_drv);
 878
 879 MODULE_AUTHOR("Intel Corporation");
 880 MODULE_LICENSE("GPL v2");
 881 MODULE_VERSION("0.6");