drivers/xen/xen-pciback/pci_stub.c

   1 /*
   2  * PCI Stub Driver - Grabs devices in backend to be exported later
   3  *
   4  * Ryan Wilson <hap9@epoch.ncsc.mil>
   5  * Chris Bookholt <hap10@epoch.ncsc.mil>
   6  */
   7 #include <linux/module.h>
   8 #include <linux/init.h>
   9 #include <linux/rwsem.h>
  10 #include <linux/list.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/kref.h>
  13 #include <linux/pci.h>
  14 #include <linux/wait.h>
  15 #include <linux/sched.h>
  16 #include <linux/atomic.h>
  17 #include <xen/events.h>
  18 #include <asm/xen/pci.h>
  19 #include <asm/xen/hypervisor.h>
  20 #include "pciback.h"
  21 #include "conf_space.h"
  22 #include "conf_space_quirks.h"
  23
  24 static char *pci_devs_to_hide;
  25 wait_queue_head_t xen_pcibk_aer_wait_queue;
  26 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
  27 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed
  28 */
  29 static DECLARE_RWSEM(pcistub_sem);
  30 module_param_named(hide, pci_devs_to_hide, charp, 0444);
  31
  32 struct pcistub_device_id {
  33         struct list_head slot_list;
  34         int domain;
  35         unsigned char bus;
  36         unsigned int devfn;
  37 };
  38 static LIST_HEAD(pcistub_device_ids);
  39 static DEFINE_SPINLOCK(device_ids_lock);
  40
  41 struct pcistub_device {
  42         struct kref kref;
  43         struct list_head dev_list;
  44         spinlock_t lock;
  45
  46         struct pci_dev *dev;
  47         struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */
  48 };
  49
  50 /* Access to pcistub_devices & seized_devices lists and the initialize_devices
  51  * flag must be locked with pcistub_devices_lock
  52  */
  53 static DEFINE_SPINLOCK(pcistub_devices_lock);
  54 static LIST_HEAD(pcistub_devices);
  55
  56 /* wait for device_initcall before initializing our devices
  57  * (see pcistub_init_devices_late)
  58  */
  59 static int initialize_devices;
  60 static LIST_HEAD(seized_devices);
  61
  62 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
  63 {
  64         struct pcistub_device *psdev;
  65
  66         dev_dbg(&dev->dev, "pcistub_device_alloc\n");
  67
  68         psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC);
  69         if (!psdev)
  70                 return NULL;
  71
  72         psdev->dev = pci_dev_get(dev);
  73         if (!psdev->dev) {
  74                 kfree(psdev);
  75                 return NULL;
  76         }
  77
  78         kref_init(&psdev->kref);
  79         spin_lock_init(&psdev->lock);
  80
  81         return psdev;
  82 }
  83
  84 /* Don't call this directly as it's called by pcistub_device_put */
  85 static void pcistub_device_release(struct kref *kref)
  86 {
  87         struct pcistub_device *psdev;
  88
  89         psdev = container_of(kref, struct pcistub_device, kref);
  90
  91         dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
  92
  93         xen_unregister_device_domain_owner(psdev->dev);
  94
  95         /* Clean-up the device */
  96         xen_pcibk_reset_device(psdev->dev);
  97         xen_pcibk_config_free_dyn_fields(psdev->dev);
  98         xen_pcibk_config_free_dev(psdev->dev);
  99         kfree(pci_get_drvdata(psdev->dev));
 100         pci_set_drvdata(psdev->dev, NULL);
 101
 102         psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
 103         pci_dev_put(psdev->dev);
 104
 105         kfree(psdev);
 106 }
 107
 108 static inline void pcistub_device_get(struct pcistub_device *psdev)
 109 {
 110         kref_get(&psdev->kref);
 111 }
 112
 113 static inline void pcistub_device_put(struct pcistub_device *psdev)
 114 {
 115         kref_put(&psdev->kref, pcistub_device_release);
 116 }
 117
 118 static struct pcistub_device *pcistub_device_find(int domain, int bus,
 119                                                   int slot, int func)
 120 {
 121         struct pcistub_device *psdev = NULL;
 122         unsigned long flags;
 123
 124         spin_lock_irqsave(&pcistub_devices_lock, flags);
 125
 126         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
 127                 if (psdev->dev != NULL
 128                     && domain == pci_domain_nr(psdev->dev->bus)
 129                     && bus == psdev->dev->bus->number
 130                     && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
 131                         pcistub_device_get(psdev);
 132                         goto out;
 133                 }
 134         }
 135
 136         /* didn't find it */
 137         psdev = NULL;
 138
 139 out:
 140         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 141         return psdev;
 142 }
 143
 144 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev,
 145                                                   struct pcistub_device *psdev)
 146 {
 147         struct pci_dev *pci_dev = NULL;
 148         unsigned long flags;
 149
 150         pcistub_device_get(psdev);
 151
 152         spin_lock_irqsave(&psdev->lock, flags);
 153         if (!psdev->pdev) {
 154                 psdev->pdev = pdev;
 155                 pci_dev = psdev->dev;
 156         }
 157         spin_unlock_irqrestore(&psdev->lock, flags);
 158
 159         if (!pci_dev)
 160                 pcistub_device_put(psdev);
 161
 162         return pci_dev;
 163 }
 164
 165 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
 166                                             int domain, int bus,
 167                                             int slot, int func)
 168 {
 169         struct pcistub_device *psdev;
 170         struct pci_dev *found_dev = NULL;
 171         unsigned long flags;
 172
 173         spin_lock_irqsave(&pcistub_devices_lock, flags);
 174
 175         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
 176                 if (psdev->dev != NULL
 177                     && domain == pci_domain_nr(psdev->dev->bus)
 178                     && bus == psdev->dev->bus->number
 179                     && PCI_DEVFN(slot, func) == psdev->dev->devfn) {
 180                         found_dev = pcistub_device_get_pci_dev(pdev, psdev);
 181                         break;
 182                 }
 183         }
 184
 185         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 186         return found_dev;
 187 }
 188
 189 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev,
 190                                     struct pci_dev *dev)
 191 {
 192         struct pcistub_device *psdev;
 193         struct pci_dev *found_dev = NULL;
 194         unsigned long flags;
 195
 196         spin_lock_irqsave(&pcistub_devices_lock, flags);
 197
 198         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
 199                 if (psdev->dev == dev) {
 200                         found_dev = pcistub_device_get_pci_dev(pdev, psdev);
 201                         break;
 202                 }
 203         }
 204
 205         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 206         return found_dev;
 207 }
 208
 209 void pcistub_put_pci_dev(struct pci_dev *dev)
 210 {
 211         struct pcistub_device *psdev, *found_psdev = NULL;
 212         unsigned long flags;
 213
 214         spin_lock_irqsave(&pcistub_devices_lock, flags);
 215
 216         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
 217                 if (psdev->dev == dev) {
 218                         found_psdev = psdev;
 219                         break;
 220                 }
 221         }
 222
 223         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 224         if (WARN_ON(!found_psdev))
 225                 return;
 226
 227         /*hold this lock for avoiding breaking link between
 228         * pcistub and xen_pcibk when AER is in processing
 229         */
 230         down_write(&pcistub_sem);
 231         /* Cleanup our device
 232          * (so it's ready for the next domain)
 233          */
 234         xen_pcibk_reset_device(found_psdev->dev);
 235         xen_pcibk_config_free_dyn_fields(found_psdev->dev);
 236         xen_pcibk_config_reset_dev(found_psdev->dev);
 237
 238         xen_unregister_device_domain_owner(found_psdev->dev);
 239
 240         spin_lock_irqsave(&found_psdev->lock, flags);
 241         found_psdev->pdev = NULL;
 242         spin_unlock_irqrestore(&found_psdev->lock, flags);
 243
 244         pcistub_device_put(found_psdev);
 245         up_write(&pcistub_sem);
 246 }
 247
 248 static int __devinit pcistub_match_one(struct pci_dev *dev,
 249                                        struct pcistub_device_id *pdev_id)
 250 {
 251         /* Match the specified device by domain, bus, slot, func and also if
 252          * any of the device's parent bridges match.
 253          */
 254         for (; dev != NULL; dev = dev->bus->self) {
 255                 if (pci_domain_nr(dev->bus) == pdev_id->domain
 256                     && dev->bus->number == pdev_id->bus
 257                     && dev->devfn == pdev_id->devfn)
 258                         return 1;
 259
 260                 /* Sometimes topmost bridge links to itself. */
 261                 if (dev == dev->bus->self)
 262                         break;
 263         }
 264
 265         return 0;
 266 }
 267
 268 static int __devinit pcistub_match(struct pci_dev *dev)
 269 {
 270         struct pcistub_device_id *pdev_id;
 271         unsigned long flags;
 272         int found = 0;
 273
 274         spin_lock_irqsave(&device_ids_lock, flags);
 275         list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) {
 276                 if (pcistub_match_one(dev, pdev_id)) {
 277                         found = 1;
 278                         break;
 279                 }
 280         }
 281         spin_unlock_irqrestore(&device_ids_lock, flags);
 282
 283         return found;
 284 }
 285
 286 static int __devinit pcistub_init_device(struct pci_dev *dev)
 287 {
 288         struct xen_pcibk_dev_data *dev_data;
 289         int err = 0;
 290
 291         dev_dbg(&dev->dev, "initializing...\n");
 292
 293         /* The PCI backend is not intended to be a module (or to work with
 294          * removable PCI devices (yet). If it were, xen_pcibk_config_free()
 295          * would need to be called somewhere to free the memory allocated
 296          * here and then to call kfree(pci_get_drvdata(psdev->dev)).
 297          */
 298         dev_data = kzalloc(sizeof(*dev_data) +  strlen(DRV_NAME "[]")
 299                                 + strlen(pci_name(dev)) + 1, GFP_ATOMIC);
 300         if (!dev_data) {
 301                 err = -ENOMEM;
 302                 goto out;
 303         }
 304         pci_set_drvdata(dev, dev_data);
 305
 306         /*
 307          * Setup name for fake IRQ handler. It will only be enabled
 308          * once the device is turned on by the guest.
 309          */
 310         sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev));
 311
 312         dev_dbg(&dev->dev, "initializing config\n");
 313
 314         init_waitqueue_head(&xen_pcibk_aer_wait_queue);
 315         err = xen_pcibk_config_init_dev(dev);
 316         if (err)
 317                 goto out;
 318
 319         /* HACK: Force device (& ACPI) to determine what IRQ it's on - we
 320          * must do this here because pcibios_enable_device may specify
 321          * the pci device's true irq (and possibly its other resources)
 322          * if they differ from what's in the configuration space.
 323          * This makes the assumption that the device's resources won't
 324          * change after this point (otherwise this code may break!)
 325          */
 326         dev_dbg(&dev->dev, "enabling device\n");
 327         err = pci_enable_device(dev);
 328         if (err)
 329                 goto config_release;
 330
 331         /* Now disable the device (this also ensures some private device
 332          * data is setup before we export)
 333          */
 334         dev_dbg(&dev->dev, "reset device\n");
 335         xen_pcibk_reset_device(dev);
 336
 337         dev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
 338         return 0;
 339
 340 config_release:
 341         xen_pcibk_config_free_dev(dev);
 342
 343 out:
 344         pci_set_drvdata(dev, NULL);
 345         kfree(dev_data);
 346         return err;
 347 }
 348
 349 /*
 350  * Because some initialization still happens on
 351  * devices during fs_initcall, we need to defer
 352  * full initialization of our devices until
 353  * device_initcall.
 354  */
 355 static int __init pcistub_init_devices_late(void)
 356 {
 357         struct pcistub_device *psdev;
 358         unsigned long flags;
 359         int err = 0;
 360
 361         pr_debug(DRV_NAME ": pcistub_init_devices_late\n");
 362
 363         spin_lock_irqsave(&pcistub_devices_lock, flags);
 364
 365         while (!list_empty(&seized_devices)) {
 366                 psdev = container_of(seized_devices.next,
 367                                      struct pcistub_device, dev_list);
 368                 list_del(&psdev->dev_list);
 369
 370                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 371
 372                 err = pcistub_init_device(psdev->dev);
 373                 if (err) {
 374                         dev_err(&psdev->dev->dev,
 375                                 "error %d initializing device\n", err);
 376                         kfree(psdev);
 377                         psdev = NULL;
 378                 }
 379
 380                 spin_lock_irqsave(&pcistub_devices_lock, flags);
 381
 382                 if (psdev)
 383                         list_add_tail(&psdev->dev_list, &pcistub_devices);
 384         }
 385
 386         initialize_devices = 1;
 387
 388         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 389
 390         return 0;
 391 }
 392
 393 static int __devinit pcistub_seize(struct pci_dev *dev)
 394 {
 395         struct pcistub_device *psdev;
 396         unsigned long flags;
 397         int err = 0;
 398
 399         psdev = pcistub_device_alloc(dev);
 400         if (!psdev)
 401                 return -ENOMEM;
 402
 403         spin_lock_irqsave(&pcistub_devices_lock, flags);
 404
 405         if (initialize_devices) {
 406                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 407
 408                 /* don't want irqs disabled when calling pcistub_init_device */
 409                 err = pcistub_init_device(psdev->dev);
 410
 411                 spin_lock_irqsave(&pcistub_devices_lock, flags);
 412
 413                 if (!err)
 414                         list_add(&psdev->dev_list, &pcistub_devices);
 415         } else {
 416                 dev_dbg(&dev->dev, "deferring initialization\n");
 417                 list_add(&psdev->dev_list, &seized_devices);
 418         }
 419
 420         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 421
 422         if (err)
 423                 pcistub_device_put(psdev);
 424
 425         return err;
 426 }
 427
 428 static int __devinit pcistub_probe(struct pci_dev *dev,
 429                                    const struct pci_device_id *id)
 430 {
 431         int err = 0;
 432
 433         dev_dbg(&dev->dev, "probing...\n");
 434
 435         if (pcistub_match(dev)) {
 436
 437                 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
 438                     && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
 439                         dev_err(&dev->dev, "can't export pci devices that "
 440                                 "don't have a normal (0) or bridge (1) "
 441                                 "header type!\n");
 442                         err = -ENODEV;
 443                         goto out;
 444                 }
 445
 446                 dev_info(&dev->dev, "seizing device\n");
 447                 err = pcistub_seize(dev);
 448         } else
 449                 /* Didn't find the device */
 450                 err = -ENODEV;
 451
 452 out:
 453         return err;
 454 }
 455
 456 static void pcistub_remove(struct pci_dev *dev)
 457 {
 458         struct pcistub_device *psdev, *found_psdev = NULL;
 459         unsigned long flags;
 460
 461         dev_dbg(&dev->dev, "removing\n");
 462
 463         spin_lock_irqsave(&pcistub_devices_lock, flags);
 464
 465         xen_pcibk_config_quirk_release(dev);
 466
 467         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
 468                 if (psdev->dev == dev) {
 469                         found_psdev = psdev;
 470                         break;
 471                 }
 472         }
 473
 474         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 475
 476         if (found_psdev) {
 477                 dev_dbg(&dev->dev, "found device to remove - in use? %p\n",
 478                         found_psdev->pdev);
 479
 480                 if (found_psdev->pdev) {
 481                         printk(KERN_WARNING DRV_NAME ": ****** removing device "
 482                                "%s while still in-use! ******\n",
 483                                pci_name(found_psdev->dev));
 484                         printk(KERN_WARNING DRV_NAME ": ****** driver domain may"
 485                                " still access this device's i/o resources!\n");
 486                         printk(KERN_WARNING DRV_NAME ": ****** shutdown driver "
 487                                "domain before binding device\n");
 488                         printk(KERN_WARNING DRV_NAME ": ****** to other drivers "
 489                                "or domains\n");
 490
 491                         xen_pcibk_release_pci_dev(found_psdev->pdev,
 492                                                 found_psdev->dev);
 493                 }
 494
 495                 spin_lock_irqsave(&pcistub_devices_lock, flags);
 496                 list_del(&found_psdev->dev_list);
 497                 spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 498
 499                 /* the final put for releasing from the list */
 500                 pcistub_device_put(found_psdev);
 501         }
 502 }
 503
 504 static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = {
 505         {
 506          .vendor = PCI_ANY_ID,
 507          .device = PCI_ANY_ID,
 508          .subvendor = PCI_ANY_ID,
 509          .subdevice = PCI_ANY_ID,
 510          },
 511         {0,},
 512 };
 513
 514 #define PCI_NODENAME_MAX 40
 515 static void kill_domain_by_device(struct pcistub_device *psdev)
 516 {
 517         struct xenbus_transaction xbt;
 518         int err;
 519         char nodename[PCI_NODENAME_MAX];
 520
 521         BUG_ON(!psdev);
 522         snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0",
 523                 psdev->pdev->xdev->otherend_id);
 524
 525 again:
 526         err = xenbus_transaction_start(&xbt);
 527         if (err) {
 528                 dev_err(&psdev->dev->dev,
 529                         "error %d when start xenbus transaction\n", err);
 530                 return;
 531         }
 532         /*PV AER handlers will set this flag*/
 533         xenbus_printf(xbt, nodename, "aerState" , "aerfail");
 534         err = xenbus_transaction_end(xbt, 0);
 535         if (err) {
 536                 if (err == -EAGAIN)
 537                         goto again;
 538                 dev_err(&psdev->dev->dev,
 539                         "error %d when end xenbus transaction\n", err);
 540                 return;
 541         }
 542 }
 543
 544 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and
 545  * backend need to have cooperation. In xen_pcibk, those steps will do similar
 546  * jobs: send service request and waiting for front_end response.
 547 */
 548 static pci_ers_result_t common_process(struct pcistub_device *psdev,
 549                                        pci_channel_state_t state, int aer_cmd,
 550                                        pci_ers_result_t result)
 551 {
 552         pci_ers_result_t res = result;
 553         struct xen_pcie_aer_op *aer_op;
 554         int ret;
 555
 556         /*with PV AER drivers*/
 557         aer_op = &(psdev->pdev->sh_info->aer_op);
 558         aer_op->cmd = aer_cmd ;
 559         /*useful for error_detected callback*/
 560         aer_op->err = state;
 561         /*pcifront_end BDF*/
 562         ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev,
 563                 &aer_op->domain, &aer_op->bus, &aer_op->devfn);
 564         if (!ret) {
 565                 dev_err(&psdev->dev->dev,
 566                         DRV_NAME ": failed to get pcifront device\n");
 567                 return PCI_ERS_RESULT_NONE;
 568         }
 569         wmb();
 570
 571         dev_dbg(&psdev->dev->dev,
 572                         DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n",
 573                         aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn);
 574         /*local flag to mark there's aer request, xen_pcibk callback will use
 575         * this flag to judge whether we need to check pci-front give aer
 576         * service ack signal
 577         */
 578         set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
 579
 580         /*It is possible that a pcifront conf_read_write ops request invokes
 581         * the callback which cause the spurious execution of wake_up.
 582         * Yet it is harmless and better than a spinlock here
 583         */
 584         set_bit(_XEN_PCIB_active,
 585                 (unsigned long *)&psdev->pdev->sh_info->flags);
 586         wmb();
 587         notify_remote_via_irq(psdev->pdev->evtchn_irq);
 588
 589         ret = wait_event_timeout(xen_pcibk_aer_wait_queue,
 590                                  !(test_bit(_XEN_PCIB_active, (unsigned long *)
 591                                  &psdev->pdev->sh_info->flags)), 300*HZ);
 592
 593         if (!ret) {
 594                 if (test_bit(_XEN_PCIB_active,
 595                         (unsigned long *)&psdev->pdev->sh_info->flags)) {
 596                         dev_err(&psdev->dev->dev,
 597                                 "pcifront aer process not responding!\n");
 598                         clear_bit(_XEN_PCIB_active,
 599                           (unsigned long *)&psdev->pdev->sh_info->flags);
 600                         aer_op->err = PCI_ERS_RESULT_NONE;
 601                         return res;
 602                 }
 603         }
 604         clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags);
 605
 606         if (test_bit(_XEN_PCIF_active,
 607                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
 608                 dev_dbg(&psdev->dev->dev,
 609                         "schedule pci_conf service in " DRV_NAME "\n");
 610                 xen_pcibk_test_and_schedule_op(psdev->pdev);
 611         }
 612
 613         res = (pci_ers_result_t)aer_op->err;
 614         return res;
 615 }
 616
 617 /*
 618 * xen_pcibk_slot_reset: it will send the slot_reset request to  pcifront in case
 619 * of the device driver could provide this service, and then wait for pcifront
 620 * ack.
 621 * @dev: pointer to PCI devices
 622 * return value is used by aer_core do_recovery policy
 623 */
 624 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev)
 625 {
 626         struct pcistub_device *psdev;
 627         pci_ers_result_t result;
 628
 629         result = PCI_ERS_RESULT_RECOVERED;
 630         dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n",
 631                 dev->bus->number, dev->devfn);
 632
 633         down_write(&pcistub_sem);
 634         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
 635                                 dev->bus->number,
 636                                 PCI_SLOT(dev->devfn),
 637                                 PCI_FUNC(dev->devfn));
 638
 639         if (!psdev || !psdev->pdev) {
 640                 dev_err(&dev->dev,
 641                         DRV_NAME " device is not found/assigned\n");
 642                 goto end;
 643         }
 644
 645         if (!psdev->pdev->sh_info) {
 646                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
 647                         " by HVM, kill it\n");
 648                 kill_domain_by_device(psdev);
 649                 goto release;
 650         }
 651
 652         if (!test_bit(_XEN_PCIB_AERHANDLER,
 653                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
 654                 dev_err(&dev->dev,
 655                         "guest with no AER driver should have been killed\n");
 656                 goto release;
 657         }
 658         result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result);
 659
 660         if (result == PCI_ERS_RESULT_NONE ||
 661                 result == PCI_ERS_RESULT_DISCONNECT) {
 662                 dev_dbg(&dev->dev,
 663                         "No AER slot_reset service or disconnected!\n");
 664                 kill_domain_by_device(psdev);
 665         }
 666 release:
 667         pcistub_device_put(psdev);
 668 end:
 669         up_write(&pcistub_sem);
 670         return result;
 671
 672 }
 673
 674
 675 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to  pcifront
 676 * in case of the device driver could provide this service, and then wait
 677 * for pcifront ack
 678 * @dev: pointer to PCI devices
 679 * return value is used by aer_core do_recovery policy
 680 */
 681
 682 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev)
 683 {
 684         struct pcistub_device *psdev;
 685         pci_ers_result_t result;
 686
 687         result = PCI_ERS_RESULT_RECOVERED;
 688         dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n",
 689                 dev->bus->number, dev->devfn);
 690
 691         down_write(&pcistub_sem);
 692         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
 693                                 dev->bus->number,
 694                                 PCI_SLOT(dev->devfn),
 695                                 PCI_FUNC(dev->devfn));
 696
 697         if (!psdev || !psdev->pdev) {
 698                 dev_err(&dev->dev,
 699                         DRV_NAME " device is not found/assigned\n");
 700                 goto end;
 701         }
 702
 703         if (!psdev->pdev->sh_info) {
 704                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
 705                         " by HVM, kill it\n");
 706                 kill_domain_by_device(psdev);
 707                 goto release;
 708         }
 709
 710         if (!test_bit(_XEN_PCIB_AERHANDLER,
 711                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
 712                 dev_err(&dev->dev,
 713                         "guest with no AER driver should have been killed\n");
 714                 goto release;
 715         }
 716         result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result);
 717
 718         if (result == PCI_ERS_RESULT_NONE ||
 719                 result == PCI_ERS_RESULT_DISCONNECT) {
 720                 dev_dbg(&dev->dev,
 721                         "No AER mmio_enabled service or disconnected!\n");
 722                 kill_domain_by_device(psdev);
 723         }
 724 release:
 725         pcistub_device_put(psdev);
 726 end:
 727         up_write(&pcistub_sem);
 728         return result;
 729 }
 730
 731 /*xen_pcibk_error_detected: it will send the error_detected request to  pcifront
 732 * in case of the device driver could provide this service, and then wait
 733 * for pcifront ack.
 734 * @dev: pointer to PCI devices
 735 * @error: the current PCI connection state
 736 * return value is used by aer_core do_recovery policy
 737 */
 738
 739 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev,
 740         pci_channel_state_t error)
 741 {
 742         struct pcistub_device *psdev;
 743         pci_ers_result_t result;
 744
 745         result = PCI_ERS_RESULT_CAN_RECOVER;
 746         dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n",
 747                 dev->bus->number, dev->devfn);
 748
 749         down_write(&pcistub_sem);
 750         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
 751                                 dev->bus->number,
 752                                 PCI_SLOT(dev->devfn),
 753                                 PCI_FUNC(dev->devfn));
 754
 755         if (!psdev || !psdev->pdev) {
 756                 dev_err(&dev->dev,
 757                         DRV_NAME " device is not found/assigned\n");
 758                 goto end;
 759         }
 760
 761         if (!psdev->pdev->sh_info) {
 762                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
 763                         " by HVM, kill it\n");
 764                 kill_domain_by_device(psdev);
 765                 goto release;
 766         }
 767
 768         /*Guest owns the device yet no aer handler regiested, kill guest*/
 769         if (!test_bit(_XEN_PCIB_AERHANDLER,
 770                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
 771                 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n");
 772                 kill_domain_by_device(psdev);
 773                 goto release;
 774         }
 775         result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result);
 776
 777         if (result == PCI_ERS_RESULT_NONE ||
 778                 result == PCI_ERS_RESULT_DISCONNECT) {
 779                 dev_dbg(&dev->dev,
 780                         "No AER error_detected service or disconnected!\n");
 781                 kill_domain_by_device(psdev);
 782         }
 783 release:
 784         pcistub_device_put(psdev);
 785 end:
 786         up_write(&pcistub_sem);
 787         return result;
 788 }
 789
 790 /*xen_pcibk_error_resume: it will send the error_resume request to  pcifront
 791 * in case of the device driver could provide this service, and then wait
 792 * for pcifront ack.
 793 * @dev: pointer to PCI devices
 794 */
 795
 796 static void xen_pcibk_error_resume(struct pci_dev *dev)
 797 {
 798         struct pcistub_device *psdev;
 799
 800         dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n",
 801                 dev->bus->number, dev->devfn);
 802
 803         down_write(&pcistub_sem);
 804         psdev = pcistub_device_find(pci_domain_nr(dev->bus),
 805                                 dev->bus->number,
 806                                 PCI_SLOT(dev->devfn),
 807                                 PCI_FUNC(dev->devfn));
 808
 809         if (!psdev || !psdev->pdev) {
 810                 dev_err(&dev->dev,
 811                         DRV_NAME " device is not found/assigned\n");
 812                 goto end;
 813         }
 814
 815         if (!psdev->pdev->sh_info) {
 816                 dev_err(&dev->dev, DRV_NAME " device is not connected or owned"
 817                         " by HVM, kill it\n");
 818                 kill_domain_by_device(psdev);
 819                 goto release;
 820         }
 821
 822         if (!test_bit(_XEN_PCIB_AERHANDLER,
 823                 (unsigned long *)&psdev->pdev->sh_info->flags)) {
 824                 dev_err(&dev->dev,
 825                         "guest with no AER driver should have been killed\n");
 826                 kill_domain_by_device(psdev);
 827                 goto release;
 828         }
 829         common_process(psdev, 1, XEN_PCI_OP_aer_resume,
 830                        PCI_ERS_RESULT_RECOVERED);
 831 release:
 832         pcistub_device_put(psdev);
 833 end:
 834         up_write(&pcistub_sem);
 835         return;
 836 }
 837
 838 /*add xen_pcibk AER handling*/
 839 static struct pci_error_handlers xen_pcibk_error_handler = {
 840         .error_detected = xen_pcibk_error_detected,
 841         .mmio_enabled = xen_pcibk_mmio_enabled,
 842         .slot_reset = xen_pcibk_slot_reset,
 843         .resume = xen_pcibk_error_resume,
 844 };
 845
 846 /*
 847  * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't
 848  * for a normal device. I don't want it to be loaded automatically.
 849  */
 850
 851 static struct pci_driver xen_pcibk_pci_driver = {
 852         /* The name should be xen_pciback, but until the tools are updated
 853          * we will keep it as pciback. */
 854         .name = "pciback",
 855         .id_table = pcistub_ids,
 856         .probe = pcistub_probe,
 857         .remove = pcistub_remove,
 858         .err_handler = &xen_pcibk_error_handler,
 859 };
 860
 861 static inline int str_to_slot(const char *buf, int *domain, int *bus,
 862                               int *slot, int *func)
 863 {
 864         int err;
 865
 866         err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func);
 867         if (err == 4)
 868                 return 0;
 869         else if (err < 0)
 870                 return -EINVAL;
 871
 872         /* try again without domain */
 873         *domain = 0;
 874         err = sscanf(buf, " %x:%x.%x", bus, slot, func);
 875         if (err == 3)
 876                 return 0;
 877
 878         return -EINVAL;
 879 }
 880
 881 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int
 882                                *slot, int *func, int *reg, int *size, int *mask)
 883 {
 884         int err;
 885
 886         err =
 887             sscanf(buf, " %04x:%02x:%02x.%d-%08x:%1x:%08x", domain, bus, slot,
 888                    func, reg, size, mask);
 889         if (err == 7)
 890                 return 0;
 891         return -EINVAL;
 892 }
 893
 894 static int pcistub_device_id_add(int domain, int bus, int slot, int func)
 895 {
 896         struct pcistub_device_id *pci_dev_id;
 897         unsigned long flags;
 898
 899         pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL);
 900         if (!pci_dev_id)
 901                 return -ENOMEM;
 902
 903         pci_dev_id->domain = domain;
 904         pci_dev_id->bus = bus;
 905         pci_dev_id->devfn = PCI_DEVFN(slot, func);
 906
 907         pr_debug(DRV_NAME ": wants to seize %04x:%02x:%02x.%d\n",
 908                  domain, bus, slot, func);
 909
 910         spin_lock_irqsave(&device_ids_lock, flags);
 911         list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids);
 912         spin_unlock_irqrestore(&device_ids_lock, flags);
 913
 914         return 0;
 915 }
 916
 917 static int pcistub_device_id_remove(int domain, int bus, int slot, int func)
 918 {
 919         struct pcistub_device_id *pci_dev_id, *t;
 920         int devfn = PCI_DEVFN(slot, func);
 921         int err = -ENOENT;
 922         unsigned long flags;
 923
 924         spin_lock_irqsave(&device_ids_lock, flags);
 925         list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids,
 926                                  slot_list) {
 927                 if (pci_dev_id->domain == domain
 928                     && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) {
 929                         /* Don't break; here because it's possible the same
 930                          * slot could be in the list more than once
 931                          */
 932                         list_del(&pci_dev_id->slot_list);
 933                         kfree(pci_dev_id);
 934
 935                         err = 0;
 936
 937                         pr_debug(DRV_NAME ": removed %04x:%02x:%02x.%d from "
 938                                  "seize list\n", domain, bus, slot, func);
 939                 }
 940         }
 941         spin_unlock_irqrestore(&device_ids_lock, flags);
 942
 943         return err;
 944 }
 945
 946 static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg,
 947                            int size, int mask)
 948 {
 949         int err = 0;
 950         struct pcistub_device *psdev;
 951         struct pci_dev *dev;
 952         struct config_field *field;
 953
 954         psdev = pcistub_device_find(domain, bus, slot, func);
 955         if (!psdev || !psdev->dev) {
 956                 err = -ENODEV;
 957                 goto out;
 958         }
 959         dev = psdev->dev;
 960
 961         field = kzalloc(sizeof(*field), GFP_ATOMIC);
 962         if (!field) {
 963                 err = -ENOMEM;
 964                 goto out;
 965         }
 966
 967         field->offset = reg;
 968         field->size = size;
 969         field->mask = mask;
 970         field->init = NULL;
 971         field->reset = NULL;
 972         field->release = NULL;
 973         field->clean = xen_pcibk_config_field_free;
 974
 975         err = xen_pcibk_config_quirks_add_field(dev, field);
 976         if (err)
 977                 kfree(field);
 978 out:
 979         return err;
 980 }
 981
 982 static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
 983                                 size_t count)
 984 {
 985         int domain, bus, slot, func;
 986         int err;
 987
 988         err = str_to_slot(buf, &domain, &bus, &slot, &func);
 989         if (err)
 990                 goto out;
 991
 992         err = pcistub_device_id_add(domain, bus, slot, func);
 993
 994 out:
 995         if (!err)
 996                 err = count;
 997         return err;
 998 }
 999 static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
1000
1001 static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
1002                                    size_t count)
1003 {
1004         int domain, bus, slot, func;
1005         int err;
1006
1007         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1008         if (err)
1009                 goto out;
1010
1011         err = pcistub_device_id_remove(domain, bus, slot, func);
1012
1013 out:
1014         if (!err)
1015                 err = count;
1016         return err;
1017 }
1018 static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
1019
1020 static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
1021 {
1022         struct pcistub_device_id *pci_dev_id;
1023         size_t count = 0;
1024         unsigned long flags;
1025
1026         spin_lock_irqsave(&device_ids_lock, flags);
1027         list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) {
1028                 if (count >= PAGE_SIZE)
1029                         break;
1030
1031                 count += scnprintf(buf + count, PAGE_SIZE - count,
1032                                    "%04x:%02x:%02x.%d\n",
1033                                    pci_dev_id->domain, pci_dev_id->bus,
1034                                    PCI_SLOT(pci_dev_id->devfn),
1035                                    PCI_FUNC(pci_dev_id->devfn));
1036         }
1037         spin_unlock_irqrestore(&device_ids_lock, flags);
1038
1039         return count;
1040 }
1041 static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
1042
1043 static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
1044 {
1045         struct pcistub_device *psdev;
1046         struct xen_pcibk_dev_data *dev_data;
1047         size_t count = 0;
1048         unsigned long flags;
1049
1050         spin_lock_irqsave(&pcistub_devices_lock, flags);
1051         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1052                 if (count >= PAGE_SIZE)
1053                         break;
1054                 if (!psdev->dev)
1055                         continue;
1056                 dev_data = pci_get_drvdata(psdev->dev);
1057                 if (!dev_data)
1058                         continue;
1059                 count +=
1060                     scnprintf(buf + count, PAGE_SIZE - count,
1061                               "%s:%s:%sing:%ld\n",
1062                               pci_name(psdev->dev),
1063                               dev_data->isr_on ? "on" : "off",
1064                               dev_data->ack_intr ? "ack" : "not ack",
1065                               dev_data->handled);
1066         }
1067         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1068         return count;
1069 }
1070 static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
1071
1072 static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
1073                                           const char *buf,
1074                                           size_t count)
1075 {
1076         struct pcistub_device *psdev;
1077         struct xen_pcibk_dev_data *dev_data;
1078         int domain, bus, slot, func;
1079         int err = -ENOENT;
1080
1081         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1082         if (err)
1083                 goto out;
1084
1085         psdev = pcistub_device_find(domain, bus, slot, func);
1086
1087         if (!psdev)
1088                 goto out;
1089
1090         dev_data = pci_get_drvdata(psdev->dev);
1091         if (!dev_data)
1092                 goto out;
1093
1094         dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n",
1095                 dev_data->irq_name, dev_data->isr_on,
1096                 !dev_data->isr_on);
1097
1098         dev_data->isr_on = !(dev_data->isr_on);
1099         if (dev_data->isr_on)
1100                 dev_data->ack_intr = 1;
1101 out:
1102         if (!err)
1103                 err = count;
1104         return err;
1105 }
1106 static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
1107                    pcistub_irq_handler_switch);
1108
1109 static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
1110                                  size_t count)
1111 {
1112         int domain, bus, slot, func, reg, size, mask;
1113         int err;
1114
1115         err = str_to_quirk(buf, &domain, &bus, &slot, &func, &reg, &size,
1116                            &mask);
1117         if (err)
1118                 goto out;
1119
1120         err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask);
1121
1122 out:
1123         if (!err)
1124                 err = count;
1125         return err;
1126 }
1127
1128 static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
1129 {
1130         int count = 0;
1131         unsigned long flags;
1132         struct xen_pcibk_config_quirk *quirk;
1133         struct xen_pcibk_dev_data *dev_data;
1134         const struct config_field *field;
1135         const struct config_field_entry *cfg_entry;
1136
1137         spin_lock_irqsave(&device_ids_lock, flags);
1138         list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) {
1139                 if (count >= PAGE_SIZE)
1140                         goto out;
1141
1142                 count += scnprintf(buf + count, PAGE_SIZE - count,
1143                                    "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n",
1144                                    quirk->pdev->bus->number,
1145                                    PCI_SLOT(quirk->pdev->devfn),
1146                                    PCI_FUNC(quirk->pdev->devfn),
1147                                    quirk->devid.vendor, quirk->devid.device,
1148                                    quirk->devid.subvendor,
1149                                    quirk->devid.subdevice);
1150
1151                 dev_data = pci_get_drvdata(quirk->pdev);
1152
1153                 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) {
1154                         field = cfg_entry->field;
1155                         if (count >= PAGE_SIZE)
1156                                 goto out;
1157
1158                         count += scnprintf(buf + count, PAGE_SIZE - count,
1159                                            "\t\t%08x:%01x:%08x\n",
1160                                            cfg_entry->base_offset +
1161                                            field->offset, field->size,
1162                                            field->mask);
1163                 }
1164         }
1165
1166 out:
1167         spin_unlock_irqrestore(&device_ids_lock, flags);
1168
1169         return count;
1170 }
1171 static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
1172                    pcistub_quirk_add);
1173
1174 static ssize_t permissive_add(struct device_driver *drv, const char *buf,
1175                               size_t count)
1176 {
1177         int domain, bus, slot, func;
1178         int err;
1179         struct pcistub_device *psdev;
1180         struct xen_pcibk_dev_data *dev_data;
1181         err = str_to_slot(buf, &domain, &bus, &slot, &func);
1182         if (err)
1183                 goto out;
1184         psdev = pcistub_device_find(domain, bus, slot, func);
1185         if (!psdev) {
1186                 err = -ENODEV;
1187                 goto out;
1188         }
1189         if (!psdev->dev) {
1190                 err = -ENODEV;
1191                 goto release;
1192         }
1193         dev_data = pci_get_drvdata(psdev->dev);
1194         /* the driver data for a device should never be null at this point */
1195         if (!dev_data) {
1196                 err = -ENXIO;
1197                 goto release;
1198         }
1199         if (!dev_data->permissive) {
1200                 dev_data->permissive = 1;
1201                 /* Let user know that what they're doing could be unsafe */
1202                 dev_warn(&psdev->dev->dev, "enabling permissive mode "
1203                          "configuration space accesses!\n");
1204                 dev_warn(&psdev->dev->dev,
1205                          "permissive mode is potentially unsafe!\n");
1206         }
1207 release:
1208         pcistub_device_put(psdev);
1209 out:
1210         if (!err)
1211                 err = count;
1212         return err;
1213 }
1214
1215 static ssize_t permissive_show(struct device_driver *drv, char *buf)
1216 {
1217         struct pcistub_device *psdev;
1218         struct xen_pcibk_dev_data *dev_data;
1219         size_t count = 0;
1220         unsigned long flags;
1221         spin_lock_irqsave(&pcistub_devices_lock, flags);
1222         list_for_each_entry(psdev, &pcistub_devices, dev_list) {
1223                 if (count >= PAGE_SIZE)
1224                         break;
1225                 if (!psdev->dev)
1226                         continue;
1227                 dev_data = pci_get_drvdata(psdev->dev);
1228                 if (!dev_data || !dev_data->permissive)
1229                         continue;
1230                 count +=
1231                     scnprintf(buf + count, PAGE_SIZE - count, "%s\n",
1232                               pci_name(psdev->dev));
1233         }
1234         spin_unlock_irqrestore(&pcistub_devices_lock, flags);
1235         return count;
1236 }
1237 static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
1238                    permissive_add);
1239
1240 static void pcistub_exit(void)
1241 {
1242         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot);
1243         driver_remove_file(&xen_pcibk_pci_driver.driver,
1244                            &driver_attr_remove_slot);
1245         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots);
1246         driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks);
1247         driver_remove_file(&xen_pcibk_pci_driver.driver,
1248                            &driver_attr_permissive);
1249         driver_remove_file(&xen_pcibk_pci_driver.driver,
1250                            &driver_attr_irq_handlers);
1251         driver_remove_file(&xen_pcibk_pci_driver.driver,
1252                            &driver_attr_irq_handler_state);
1253         pci_unregister_driver(&xen_pcibk_pci_driver);
1254 }
1255
1256 static int __init pcistub_init(void)
1257 {
1258         int pos = 0;
1259         int err = 0;
1260         int domain, bus, slot, func;
1261         int parsed;
1262
1263         if (pci_devs_to_hide && *pci_devs_to_hide) {
1264                 do {
1265                         parsed = 0;
1266
1267                         err = sscanf(pci_devs_to_hide + pos,
1268                                      " (%x:%x:%x.%x) %n",
1269                                      &domain, &bus, &slot, &func, &parsed);
1270                         if (err != 4) {
1271                                 domain = 0;
1272                                 err = sscanf(pci_devs_to_hide + pos,
1273                                              " (%x:%x.%x) %n",
1274                                              &bus, &slot, &func, &parsed);
1275                                 if (err != 3)
1276                                         goto parse_error;
1277                         }
1278
1279                         err = pcistub_device_id_add(domain, bus, slot, func);
1280                         if (err)
1281                                 goto out;
1282
1283                         /* if parsed<=0, we've reached the end of the string */
1284                         pos += parsed;
1285                 } while (parsed > 0 && pci_devs_to_hide[pos]);
1286         }
1287
1288         /* If we're the first PCI Device Driver to register, we're the
1289          * first one to get offered PCI devices as they become
1290          * available (and thus we can be the first to grab them)
1291          */
1292         err = pci_register_driver(&xen_pcibk_pci_driver);
1293         if (err < 0)
1294                 goto out;
1295
1296         err = driver_create_file(&xen_pcibk_pci_driver.driver,
1297                                  &driver_attr_new_slot);
1298         if (!err)
1299                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1300                                          &driver_attr_remove_slot);
1301         if (!err)
1302                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1303                                          &driver_attr_slots);
1304         if (!err)
1305                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1306                                          &driver_attr_quirks);
1307         if (!err)
1308                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1309                                          &driver_attr_permissive);
1310
1311         if (!err)
1312                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1313                                          &driver_attr_irq_handlers);
1314         if (!err)
1315                 err = driver_create_file(&xen_pcibk_pci_driver.driver,
1316                                         &driver_attr_irq_handler_state);
1317         if (err)
1318                 pcistub_exit();
1319
1320 out:
1321         return err;
1322
1323 parse_error:
1324         printk(KERN_ERR DRV_NAME ": Error parsing pci_devs_to_hide at \"%s\"\n",
1325                pci_devs_to_hide + pos);
1326         return -EINVAL;
1327 }
1328
1329 #ifndef MODULE
1330 /*
1331  * fs_initcall happens before device_initcall
1332  * so xen_pcibk *should* get called first (b/c we
1333  * want to suck up any device before other drivers
1334  * get a chance by being the first pci device
1335  * driver to register)
1336  */
1337 fs_initcall(pcistub_init);
1338 #endif
1339
1340 static int __init xen_pcibk_init(void)
1341 {
1342         int err;
1343
1344         if (!xen_initial_domain())
1345                 return -ENODEV;
1346
1347         err = xen_pcibk_config_init();
1348         if (err)
1349                 return err;
1350
1351 #ifdef MODULE
1352         err = pcistub_init();
1353         if (err < 0)
1354                 return err;
1355 #endif
1356
1357         pcistub_init_devices_late();
1358         err = xen_pcibk_xenbus_register();
1359         if (err)
1360                 pcistub_exit();
1361
1362         return err;
1363 }
1364
1365 static void __exit xen_pcibk_cleanup(void)
1366 {
1367         xen_pcibk_xenbus_unregister();
1368         pcistub_exit();
1369 }
1370
1371 module_init(xen_pcibk_init);
1372 module_exit(xen_pcibk_cleanup);
1373
1374 MODULE_LICENSE("Dual BSD/GPL");
1375 MODULE_ALIAS("xen-backend:pci");