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