drivers/vfio/pci/vfio_pci.c

   1 /*
   2  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
   3  *     Author: Alex Williamson <alex.williamson@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Derived from original vfio:
  10  * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
  11  * Author: Tom Lyon, pugs@cisco.com
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/eventfd.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/iommu.h>
  18 #include <linux/module.h>
  19 #include <linux/mutex.h>
  20 #include <linux/notifier.h>
  21 #include <linux/pci.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/slab.h>
  24 #include <linux/types.h>
  25 #include <linux/uaccess.h>
  26 #include <linux/vfio.h>
  27
  28 #include "vfio_pci_private.h"
  29
  30 #define DRIVER_VERSION  "0.2"
  31 #define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@redhat.com>"
  32 #define DRIVER_DESC     "VFIO PCI - User Level meta-driver"
  33
  34 static bool nointxmask;
  35 module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);
  36 MODULE_PARM_DESC(nointxmask,
  37                   "Disable support for PCI 2.3 style INTx masking.  If this resolves problems for specific devices, report lspci -vvvxxx to linux-pci@vger.kernel.org so the device can be fixed automatically via the broken_intx_masking flag.");
  38
  39 static int vfio_pci_enable(struct vfio_pci_device *vdev)
  40 {
  41         struct pci_dev *pdev = vdev->pdev;
  42         int ret;
  43         u16 cmd;
  44         u8 msix_pos;
  45
  46         ret = pci_enable_device(pdev);
  47         if (ret)
  48                 return ret;
  49
  50         vdev->reset_works = (pci_reset_function(pdev) == 0);
  51         pci_save_state(pdev);
  52         vdev->pci_saved_state = pci_store_saved_state(pdev);
  53         if (!vdev->pci_saved_state)
  54                 pr_debug("%s: Couldn't store %s saved state\n",
  55                          __func__, dev_name(&pdev->dev));
  56
  57         ret = vfio_config_init(vdev);
  58         if (ret) {
  59                 pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state);
  60                 pci_disable_device(pdev);
  61                 return ret;
  62         }
  63
  64         if (likely(!nointxmask))
  65                 vdev->pci_2_3 = pci_intx_mask_supported(pdev);
  66
  67         pci_read_config_word(pdev, PCI_COMMAND, &cmd);
  68         if (vdev->pci_2_3 && (cmd & PCI_COMMAND_INTX_DISABLE)) {
  69                 cmd &= ~PCI_COMMAND_INTX_DISABLE;
  70                 pci_write_config_word(pdev, PCI_COMMAND, cmd);
  71         }
  72
  73         msix_pos = pdev->msix_cap;
  74         if (msix_pos) {
  75                 u16 flags;
  76                 u32 table;
  77
  78                 pci_read_config_word(pdev, msix_pos + PCI_MSIX_FLAGS, &flags);
  79                 pci_read_config_dword(pdev, msix_pos + PCI_MSIX_TABLE, &table);
  80
  81                 vdev->msix_bar = table & PCI_MSIX_TABLE_BIR;
  82                 vdev->msix_offset = table & PCI_MSIX_TABLE_OFFSET;
  83                 vdev->msix_size = ((flags & PCI_MSIX_FLAGS_QSIZE) + 1) * 16;
  84         } else
  85                 vdev->msix_bar = 0xFF;
  86
  87 #ifdef CONFIG_VFIO_PCI_VGA
  88         if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
  89                 vdev->has_vga = true;
  90 #endif
  91
  92         return 0;
  93 }
  94
  95 static void vfio_pci_disable(struct vfio_pci_device *vdev)
  96 {
  97         struct pci_dev *pdev = vdev->pdev;
  98         int bar;
  99
 100         pci_disable_device(pdev);
 101
 102         vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
 103                                 VFIO_IRQ_SET_ACTION_TRIGGER,
 104                                 vdev->irq_type, 0, 0, NULL);
 105
 106         vdev->virq_disabled = false;
 107
 108         vfio_config_free(vdev);
 109
 110         for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
 111                 if (!vdev->barmap[bar])
 112                         continue;
 113                 pci_iounmap(pdev, vdev->barmap[bar]);
 114                 pci_release_selected_regions(pdev, 1 << bar);
 115                 vdev->barmap[bar] = NULL;
 116         }
 117
 118         /*
 119          * If we have saved state, restore it.  If we can reset the device,
 120          * even better.  Resetting with current state seems better than
 121          * nothing, but saving and restoring current state without reset
 122          * is just busy work.
 123          */
 124         if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
 125                 pr_info("%s: Couldn't reload %s saved state\n",
 126                         __func__, dev_name(&pdev->dev));
 127
 128                 if (!vdev->reset_works)
 129                         return;
 130
 131                 pci_save_state(pdev);
 132         }
 133
 134         /*
 135          * Disable INTx and MSI, presumably to avoid spurious interrupts
 136          * during reset.  Stolen from pci_reset_function()
 137          */
 138         pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
 139
 140         /*
 141          * Careful, device_lock may already be held.  This is the case if
 142          * a driver unbind is blocked.  Try to get the locks ourselves to
 143          * prevent a deadlock.
 144          */
 145         if (vdev->reset_works) {
 146                 bool reset_done = false;
 147
 148                 if (pci_cfg_access_trylock(pdev)) {
 149                         if (device_trylock(&pdev->dev)) {
 150                                 __pci_reset_function_locked(pdev);
 151                                 reset_done = true;
 152                                 device_unlock(&pdev->dev);
 153                         }
 154                         pci_cfg_access_unlock(pdev);
 155                 }
 156
 157                 if (!reset_done)
 158                         pr_warn("%s: Unable to acquire locks for reset of %s\n",
 159                                 __func__, dev_name(&pdev->dev));
 160         }
 161
 162         pci_restore_state(pdev);
 163 }
 164
 165 static void vfio_pci_release(void *device_data)
 166 {
 167         struct vfio_pci_device *vdev = device_data;
 168
 169         if (atomic_dec_and_test(&vdev->refcnt))
 170                 vfio_pci_disable(vdev);
 171
 172         module_put(THIS_MODULE);
 173 }
 174
 175 static int vfio_pci_open(void *device_data)
 176 {
 177         struct vfio_pci_device *vdev = device_data;
 178
 179         if (!try_module_get(THIS_MODULE))
 180                 return -ENODEV;
 181
 182         if (atomic_inc_return(&vdev->refcnt) == 1) {
 183                 int ret = vfio_pci_enable(vdev);
 184                 if (ret) {
 185                         module_put(THIS_MODULE);
 186                         return ret;
 187                 }
 188         }
 189
 190         return 0;
 191 }
 192
 193 static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
 194 {
 195         if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
 196                 u8 pin;
 197                 pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
 198                 if (pin)
 199                         return 1;
 200
 201         } else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
 202                 u8 pos;
 203                 u16 flags;
 204
 205                 pos = vdev->pdev->msi_cap;
 206                 if (pos) {
 207                         pci_read_config_word(vdev->pdev,
 208                                              pos + PCI_MSI_FLAGS, &flags);
 209
 210                         return 1 << (flags & PCI_MSI_FLAGS_QMASK);
 211                 }
 212         } else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
 213                 u8 pos;
 214                 u16 flags;
 215
 216                 pos = vdev->pdev->msix_cap;
 217                 if (pos) {
 218                         pci_read_config_word(vdev->pdev,
 219                                              pos + PCI_MSIX_FLAGS, &flags);
 220
 221                         return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
 222                 }
 223         } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX)
 224                 if (pci_is_pcie(vdev->pdev))
 225                         return 1;
 226
 227         return 0;
 228 }
 229
 230 static long vfio_pci_ioctl(void *device_data,
 231                            unsigned int cmd, unsigned long arg)
 232 {
 233         struct vfio_pci_device *vdev = device_data;
 234         unsigned long minsz;
 235
 236         if (cmd == VFIO_DEVICE_GET_INFO) {
 237                 struct vfio_device_info info;
 238
 239                 minsz = offsetofend(struct vfio_device_info, num_irqs);
 240
 241                 if (copy_from_user(&info, (void __user *)arg, minsz))
 242                         return -EFAULT;
 243
 244                 if (info.argsz < minsz)
 245                         return -EINVAL;
 246
 247                 info.flags = VFIO_DEVICE_FLAGS_PCI;
 248
 249                 if (vdev->reset_works)
 250                         info.flags |= VFIO_DEVICE_FLAGS_RESET;
 251
 252                 info.num_regions = VFIO_PCI_NUM_REGIONS;
 253                 info.num_irqs = VFIO_PCI_NUM_IRQS;
 254
 255                 return copy_to_user((void __user *)arg, &info, minsz);
 256
 257         } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
 258                 struct pci_dev *pdev = vdev->pdev;
 259                 struct vfio_region_info info;
 260
 261                 minsz = offsetofend(struct vfio_region_info, offset);
 262
 263                 if (copy_from_user(&info, (void __user *)arg, minsz))
 264                         return -EFAULT;
 265
 266                 if (info.argsz < minsz)
 267                         return -EINVAL;
 268
 269                 switch (info.index) {
 270                 case VFIO_PCI_CONFIG_REGION_INDEX:
 271                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
 272                         info.size = pdev->cfg_size;
 273                         info.flags = VFIO_REGION_INFO_FLAG_READ |
 274                                      VFIO_REGION_INFO_FLAG_WRITE;
 275                         break;
 276                 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
 277                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
 278                         info.size = pci_resource_len(pdev, info.index);
 279                         if (!info.size) {
 280                                 info.flags = 0;
 281                                 break;
 282                         }
 283
 284                         info.flags = VFIO_REGION_INFO_FLAG_READ |
 285                                      VFIO_REGION_INFO_FLAG_WRITE;
 286                         if (pci_resource_flags(pdev, info.index) &
 287                             IORESOURCE_MEM && info.size >= PAGE_SIZE)
 288                                 info.flags |= VFIO_REGION_INFO_FLAG_MMAP;
 289                         break;
 290                 case VFIO_PCI_ROM_REGION_INDEX:
 291                 {
 292                         void __iomem *io;
 293                         size_t size;
 294
 295                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
 296                         info.flags = 0;
 297
 298                         /* Report the BAR size, not the ROM size */
 299                         info.size = pci_resource_len(pdev, info.index);
 300                         if (!info.size)
 301                                 break;
 302
 303                         /* Is it really there? */
 304                         io = pci_map_rom(pdev, &size);
 305                         if (!io || !size) {
 306                                 info.size = 0;
 307                                 break;
 308                         }
 309                         pci_unmap_rom(pdev, io);
 310
 311                         info.flags = VFIO_REGION_INFO_FLAG_READ;
 312                         break;
 313                 }
 314                 case VFIO_PCI_VGA_REGION_INDEX:
 315                         if (!vdev->has_vga)
 316                                 return -EINVAL;
 317
 318                         info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
 319                         info.size = 0xc0000;
 320                         info.flags = VFIO_REGION_INFO_FLAG_READ |
 321                                      VFIO_REGION_INFO_FLAG_WRITE;
 322
 323                         break;
 324                 default:
 325                         return -EINVAL;
 326                 }
 327
 328                 return copy_to_user((void __user *)arg, &info, minsz);
 329
 330         } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
 331                 struct vfio_irq_info info;
 332
 333                 minsz = offsetofend(struct vfio_irq_info, count);
 334
 335                 if (copy_from_user(&info, (void __user *)arg, minsz))
 336                         return -EFAULT;
 337
 338                 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
 339                         return -EINVAL;
 340
 341                 switch (info.index) {
 342                 case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
 343                         break;
 344                 case VFIO_PCI_ERR_IRQ_INDEX:
 345                         if (pci_is_pcie(vdev->pdev))
 346                                 break;
 347                 /* pass thru to return error */
 348                 default:
 349                         return -EINVAL;
 350                 }
 351
 352                 info.flags = VFIO_IRQ_INFO_EVENTFD;
 353
 354                 info.count = vfio_pci_get_irq_count(vdev, info.index);
 355
 356                 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
 357                         info.flags |= (VFIO_IRQ_INFO_MASKABLE |
 358                                        VFIO_IRQ_INFO_AUTOMASKED);
 359                 else
 360                         info.flags |= VFIO_IRQ_INFO_NORESIZE;
 361
 362                 return copy_to_user((void __user *)arg, &info, minsz);
 363
 364         } else if (cmd == VFIO_DEVICE_SET_IRQS) {
 365                 struct vfio_irq_set hdr;
 366                 u8 *data = NULL;
 367                 int ret = 0;
 368
 369                 minsz = offsetofend(struct vfio_irq_set, count);
 370
 371                 if (copy_from_user(&hdr, (void __user *)arg, minsz))
 372                         return -EFAULT;
 373
 374                 if (hdr.argsz < minsz || hdr.index >= VFIO_PCI_NUM_IRQS ||
 375                     hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
 376                                   VFIO_IRQ_SET_ACTION_TYPE_MASK))
 377                         return -EINVAL;
 378
 379                 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
 380                         size_t size;
 381                         int max = vfio_pci_get_irq_count(vdev, hdr.index);
 382
 383                         if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
 384                                 size = sizeof(uint8_t);
 385                         else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
 386                                 size = sizeof(int32_t);
 387                         else
 388                                 return -EINVAL;
 389
 390                         if (hdr.argsz - minsz < hdr.count * size ||
 391                             hdr.start >= max || hdr.start + hdr.count > max)
 392                                 return -EINVAL;
 393
 394                         data = memdup_user((void __user *)(arg + minsz),
 395                                            hdr.count * size);
 396                         if (IS_ERR(data))
 397                                 return PTR_ERR(data);
 398                 }
 399
 400                 mutex_lock(&vdev->igate);
 401
 402                 ret = vfio_pci_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
 403                                               hdr.start, hdr.count, data);
 404
 405                 mutex_unlock(&vdev->igate);
 406                 kfree(data);
 407
 408                 return ret;
 409
 410         } else if (cmd == VFIO_DEVICE_RESET)
 411                 return vdev->reset_works ?
 412                         pci_reset_function(vdev->pdev) : -EINVAL;
 413
 414         return -ENOTTY;
 415 }
 416
 417 static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
 418                            size_t count, loff_t *ppos, bool iswrite)
 419 {
 420         unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
 421         struct vfio_pci_device *vdev = device_data;
 422
 423         if (index >= VFIO_PCI_NUM_REGIONS)
 424                 return -EINVAL;
 425
 426         switch (index) {
 427         case VFIO_PCI_CONFIG_REGION_INDEX:
 428                 return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
 429
 430         case VFIO_PCI_ROM_REGION_INDEX:
 431                 if (iswrite)
 432                         return -EINVAL;
 433                 return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
 434
 435         case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
 436                 return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
 437
 438         case VFIO_PCI_VGA_REGION_INDEX:
 439                 return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite);
 440         }
 441
 442         return -EINVAL;
 443 }
 444
 445 static ssize_t vfio_pci_read(void *device_data, char __user *buf,
 446                              size_t count, loff_t *ppos)
 447 {
 448         if (!count)
 449                 return 0;
 450
 451         return vfio_pci_rw(device_data, buf, count, ppos, false);
 452 }
 453
 454 static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
 455                               size_t count, loff_t *ppos)
 456 {
 457         if (!count)
 458                 return 0;
 459
 460         return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
 461 }
 462
 463 static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
 464 {
 465         struct vfio_pci_device *vdev = device_data;
 466         struct pci_dev *pdev = vdev->pdev;
 467         unsigned int index;
 468         u64 phys_len, req_len, pgoff, req_start;
 469         int ret;
 470
 471         index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
 472
 473         if (vma->vm_end < vma->vm_start)
 474                 return -EINVAL;
 475         if ((vma->vm_flags & VM_SHARED) == 0)
 476                 return -EINVAL;
 477         if (index >= VFIO_PCI_ROM_REGION_INDEX)
 478                 return -EINVAL;
 479         if (!(pci_resource_flags(pdev, index) & IORESOURCE_MEM))
 480                 return -EINVAL;
 481
 482         phys_len = pci_resource_len(pdev, index);
 483         req_len = vma->vm_end - vma->vm_start;
 484         pgoff = vma->vm_pgoff &
 485                 ((1U << (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
 486         req_start = pgoff << PAGE_SHIFT;
 487
 488         if (phys_len < PAGE_SIZE || req_start + req_len > phys_len)
 489                 return -EINVAL;
 490
 491         if (index == vdev->msix_bar) {
 492                 /*
 493                  * Disallow mmaps overlapping the MSI-X table; users don't
 494                  * get to touch this directly.  We could find somewhere
 495                  * else to map the overlap, but page granularity is only
 496                  * a recommendation, not a requirement, so the user needs
 497                  * to know which bits are real.  Requiring them to mmap
 498                  * around the table makes that clear.
 499                  */
 500
 501                 /* If neither entirely above nor below, then it overlaps */
 502                 if (!(req_start >= vdev->msix_offset + vdev->msix_size ||
 503                       req_start + req_len <= vdev->msix_offset))
 504                         return -EINVAL;
 505         }
 506
 507         /*
 508          * Even though we don't make use of the barmap for the mmap,
 509          * we need to request the region and the barmap tracks that.
 510          */
 511         if (!vdev->barmap[index]) {
 512                 ret = pci_request_selected_regions(pdev,
 513                                                    1 << index, "vfio-pci");
 514                 if (ret)
 515                         return ret;
 516
 517                 vdev->barmap[index] = pci_iomap(pdev, index, 0);
 518         }
 519
 520         vma->vm_private_data = vdev;
 521         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 522         vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
 523
 524         return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
 525                                req_len, vma->vm_page_prot);
 526 }
 527
 528 static const struct vfio_device_ops vfio_pci_ops = {
 529         .name           = "vfio-pci",
 530         .open           = vfio_pci_open,
 531         .release        = vfio_pci_release,
 532         .ioctl          = vfio_pci_ioctl,
 533         .read           = vfio_pci_read,
 534         .write          = vfio_pci_write,
 535         .mmap           = vfio_pci_mmap,
 536 };
 537
 538 static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 539 {
 540         u8 type;
 541         struct vfio_pci_device *vdev;
 542         struct iommu_group *group;
 543         int ret;
 544
 545         pci_read_config_byte(pdev, PCI_HEADER_TYPE, &type);
 546         if ((type & PCI_HEADER_TYPE) != PCI_HEADER_TYPE_NORMAL)
 547                 return -EINVAL;
 548
 549         group = iommu_group_get(&pdev->dev);
 550         if (!group)
 551                 return -EINVAL;
 552
 553         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 554         if (!vdev) {
 555                 iommu_group_put(group);
 556                 return -ENOMEM;
 557         }
 558
 559         vdev->pdev = pdev;
 560         vdev->irq_type = VFIO_PCI_NUM_IRQS;
 561         mutex_init(&vdev->igate);
 562         spin_lock_init(&vdev->irqlock);
 563         atomic_set(&vdev->refcnt, 0);
 564
 565         ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
 566         if (ret) {
 567                 iommu_group_put(group);
 568                 kfree(vdev);
 569         }
 570
 571         return ret;
 572 }
 573
 574 static void vfio_pci_remove(struct pci_dev *pdev)
 575 {
 576         struct vfio_pci_device *vdev;
 577
 578         vdev = vfio_del_group_dev(&pdev->dev);
 579         if (!vdev)
 580                 return;
 581
 582         iommu_group_put(pdev->dev.iommu_group);
 583         kfree(vdev);
 584 }
 585
 586 static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
 587                                                   pci_channel_state_t state)
 588 {
 589         struct vfio_pci_device *vdev;
 590         struct vfio_device *device;
 591
 592         device = vfio_device_get_from_dev(&pdev->dev);
 593         if (device == NULL)
 594                 return PCI_ERS_RESULT_DISCONNECT;
 595
 596         vdev = vfio_device_data(device);
 597         if (vdev == NULL) {
 598                 vfio_device_put(device);
 599                 return PCI_ERS_RESULT_DISCONNECT;
 600         }
 601
 602         if (vdev->err_trigger)
 603                 eventfd_signal(vdev->err_trigger, 1);
 604
 605         vfio_device_put(device);
 606
 607         return PCI_ERS_RESULT_CAN_RECOVER;
 608 }
 609
 610 static struct pci_error_handlers vfio_err_handlers = {
 611         .error_detected = vfio_pci_aer_err_detected,
 612 };
 613
 614 static struct pci_driver vfio_pci_driver = {
 615         .name           = "vfio-pci",
 616         .id_table       = NULL, /* only dynamic ids */
 617         .probe          = vfio_pci_probe,
 618         .remove         = vfio_pci_remove,
 619         .err_handler    = &vfio_err_handlers,
 620 };
 621
 622 static void __exit vfio_pci_cleanup(void)
 623 {
 624         pci_unregister_driver(&vfio_pci_driver);
 625         vfio_pci_virqfd_exit();
 626         vfio_pci_uninit_perm_bits();
 627 }
 628
 629 static int __init vfio_pci_init(void)
 630 {
 631         int ret;
 632
 633         /* Allocate shared config space permision data used by all devices */
 634         ret = vfio_pci_init_perm_bits();
 635         if (ret)
 636                 return ret;
 637
 638         /* Start the virqfd cleanup handler */
 639         ret = vfio_pci_virqfd_init();
 640         if (ret)
 641                 goto out_virqfd;
 642
 643         /* Register and scan for devices */
 644         ret = pci_register_driver(&vfio_pci_driver);
 645         if (ret)
 646                 goto out_driver;
 647
 648         return 0;
 649
 650 out_driver:
 651         vfio_pci_virqfd_exit();
 652 out_virqfd:
 653         vfio_pci_uninit_perm_bits();
 654         return ret;
 655 }
 656
 657 module_init(vfio_pci_init);
 658 module_exit(vfio_pci_cleanup);
 659
 660 MODULE_VERSION(DRIVER_VERSION);
 661 MODULE_LICENSE("GPL v2");
 662 MODULE_AUTHOR(DRIVER_AUTHOR);
 663 MODULE_DESCRIPTION(DRIVER_DESC);