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 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/module.h> 11#include <linux/init.h> 12#include <linux/rwsem.h> 13#include <linux/list.h> 14#include <linux/spinlock.h> 15#include <linux/kref.h> 16#include <linux/pci.h> 17#include <linux/wait.h> 18#include <linux/sched.h> 19#include <linux/atomic.h> 20#include <xen/events.h> 21#include <asm/xen/pci.h> 22#include <asm/xen/hypervisor.h> 23#include <xen/interface/physdev.h> 24#include "pciback.h" 25#include "conf_space.h" 26#include "conf_space_quirks.h" 27 28static char *pci_devs_to_hide; 29wait_queue_head_t xen_pcibk_aer_wait_queue; 30/*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, 31* We want to avoid in middle of AER ops, xen_pcibk devices is being removed 32*/ 33static DECLARE_RWSEM(pcistub_sem); 34module_param_named(hide, pci_devs_to_hide, charp, 0444); 35 36struct pcistub_device_id { 37 struct list_head slot_list; 38 int domain; 39 unsigned char bus; 40 unsigned int devfn; 41}; 42static LIST_HEAD(pcistub_device_ids); 43static DEFINE_SPINLOCK(device_ids_lock); 44 45struct pcistub_device { 46 struct kref kref; 47 struct list_head dev_list; 48 spinlock_t lock; 49 50 struct pci_dev *dev; 51 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ 52}; 53 54/* Access to pcistub_devices & seized_devices lists and the initialize_devices 55 * flag must be locked with pcistub_devices_lock 56 */ 57static DEFINE_SPINLOCK(pcistub_devices_lock); 58static LIST_HEAD(pcistub_devices); 59 60/* wait for device_initcall before initializing our devices 61 * (see pcistub_init_devices_late) 62 */ 63static int initialize_devices; 64static LIST_HEAD(seized_devices); 65 66static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) 67{ 68 struct pcistub_device *psdev; 69 70 dev_dbg(&dev->dev, "pcistub_device_alloc\n"); 71 72 psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC); 73 if (!psdev) 74 return NULL; 75 76 psdev->dev = pci_dev_get(dev); 77 if (!psdev->dev) { 78 kfree(psdev); 79 return NULL; 80 } 81 82 kref_init(&psdev->kref); 83 spin_lock_init(&psdev->lock); 84 85 return psdev; 86} 87 88/* Don't call this directly as it's called by pcistub_device_put */ 89static void pcistub_device_release(struct kref *kref) 90{ 91 struct pcistub_device *psdev; 92 struct pci_dev *dev; 93 struct xen_pcibk_dev_data *dev_data; 94 95 psdev = container_of(kref, struct pcistub_device, kref); 96 dev = psdev->dev; 97 dev_data = pci_get_drvdata(dev); 98 99 dev_dbg(&dev->dev, "pcistub_device_release\n"); 100 101 xen_unregister_device_domain_owner(dev); 102 103 /* Call the reset function which does not take lock as this 104 * is called from "unbind" which takes a device_lock mutex. 105 */ 106 __pci_reset_function_locked(dev); 107 if (pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) 108 dev_info(&dev->dev, "Could not reload PCI state\n"); 109 else 110 pci_restore_state(dev); 111 112 if (dev->msix_cap) { 113 struct physdev_pci_device ppdev = { 114 .seg = pci_domain_nr(dev->bus), 115 .bus = dev->bus->number, 116 .devfn = dev->devfn 117 }; 118 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix, 119 &ppdev); 120 121 if (err && err != -ENOSYS) 122 dev_warn(&dev->dev, "MSI-X release failed (%d)\n", 123 err); 124 } 125 126 /* Disable the device */ 127 xen_pcibk_reset_device(dev); 128 129 kfree(dev_data); 130 pci_set_drvdata(dev, NULL); 131 132 /* Clean-up the device */ 133 xen_pcibk_config_free_dyn_fields(dev); 134 xen_pcibk_config_free_dev(dev); 135 136 pci_clear_dev_assigned(dev); 137 pci_dev_put(dev); 138 139 kfree(psdev); 140} 141 142static inline void pcistub_device_get(struct pcistub_device *psdev) 143{ 144 kref_get(&psdev->kref); 145} 146 147static inline void pcistub_device_put(struct pcistub_device *psdev) 148{ 149 kref_put(&psdev->kref, pcistub_device_release); 150} 151 152static struct pcistub_device *pcistub_device_find(int domain, int bus, 153 int slot, int func) 154{ 155 struct pcistub_device *psdev = NULL; 156 unsigned long flags; 157 158 spin_lock_irqsave(&pcistub_devices_lock, flags); 159 160 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 161 if (psdev->dev != NULL 162 && domain == pci_domain_nr(psdev->dev->bus) 163 && bus == psdev->dev->bus->number 164 && slot == PCI_SLOT(psdev->dev->devfn) 165 && func == PCI_FUNC(psdev->dev->devfn)) { 166 pcistub_device_get(psdev); 167 goto out; 168 } 169 } 170 171 /* didn't find it */ 172 psdev = NULL; 173 174out: 175 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 176 return psdev; 177} 178 179static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, 180 struct pcistub_device *psdev) 181{ 182 struct pci_dev *pci_dev = NULL; 183 unsigned long flags; 184 185 pcistub_device_get(psdev); 186 187 spin_lock_irqsave(&psdev->lock, flags); 188 if (!psdev->pdev) { 189 psdev->pdev = pdev; 190 pci_dev = psdev->dev; 191 } 192 spin_unlock_irqrestore(&psdev->lock, flags); 193 194 if (!pci_dev) 195 pcistub_device_put(psdev); 196 197 return pci_dev; 198} 199 200struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, 201 int domain, int bus, 202 int slot, int func) 203{ 204 struct pcistub_device *psdev; 205 struct pci_dev *found_dev = NULL; 206 unsigned long flags; 207 208 spin_lock_irqsave(&pcistub_devices_lock, flags); 209 210 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 211 if (psdev->dev != NULL 212 && domain == pci_domain_nr(psdev->dev->bus) 213 && bus == psdev->dev->bus->number 214 && slot == PCI_SLOT(psdev->dev->devfn) 215 && func == PCI_FUNC(psdev->dev->devfn)) { 216 found_dev = pcistub_device_get_pci_dev(pdev, psdev); 217 break; 218 } 219 } 220 221 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 222 return found_dev; 223} 224 225struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, 226 struct pci_dev *dev) 227{ 228 struct pcistub_device *psdev; 229 struct pci_dev *found_dev = NULL; 230 unsigned long flags; 231 232 spin_lock_irqsave(&pcistub_devices_lock, flags); 233 234 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 235 if (psdev->dev == dev) { 236 found_dev = pcistub_device_get_pci_dev(pdev, psdev); 237 break; 238 } 239 } 240 241 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 242 return found_dev; 243} 244 245/* 246 * Called when: 247 * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device 248 * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove 249 * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove 250 * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove 251 * 252 * As such we have to be careful. 253 * 254 * To make this easier, the caller has to hold the device lock. 255 */ 256void pcistub_put_pci_dev(struct pci_dev *dev) 257{ 258 struct pcistub_device *psdev, *found_psdev = NULL; 259 unsigned long flags; 260 struct xen_pcibk_dev_data *dev_data; 261 int ret; 262 263 spin_lock_irqsave(&pcistub_devices_lock, flags); 264 265 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 266 if (psdev->dev == dev) { 267 found_psdev = psdev; 268 break; 269 } 270 } 271 272 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 273 if (WARN_ON(!found_psdev)) 274 return; 275 276 /*hold this lock for avoiding breaking link between 277 * pcistub and xen_pcibk when AER is in processing 278 */ 279 down_write(&pcistub_sem); 280 /* Cleanup our device 281 * (so it's ready for the next domain) 282 */ 283 device_lock_assert(&dev->dev); 284 __pci_reset_function_locked(dev); 285 286 dev_data = pci_get_drvdata(dev); 287 ret = pci_load_saved_state(dev, dev_data->pci_saved_state); 288 if (!ret) { 289 /* 290 * The usual sequence is pci_save_state & pci_restore_state 291 * but the guest might have messed the configuration space up. 292 * Use the initial version (when device was bound to us). 293 */ 294 pci_restore_state(dev); 295 } else 296 dev_info(&dev->dev, "Could not reload PCI state\n"); 297 /* This disables the device. */ 298 xen_pcibk_reset_device(dev); 299 300 /* And cleanup up our emulated fields. */ 301 xen_pcibk_config_reset_dev(dev); 302 xen_pcibk_config_free_dyn_fields(dev); 303 304 xen_unregister_device_domain_owner(dev); 305 306 spin_lock_irqsave(&found_psdev->lock, flags); 307 found_psdev->pdev = NULL; 308 spin_unlock_irqrestore(&found_psdev->lock, flags); 309 310 pcistub_device_put(found_psdev); 311 up_write(&pcistub_sem); 312} 313 314static int pcistub_match_one(struct pci_dev *dev, 315 struct pcistub_device_id *pdev_id) 316{ 317 /* Match the specified device by domain, bus, slot, func and also if 318 * any of the device's parent bridges match. 319 */ 320 for (; dev != NULL; dev = dev->bus->self) { 321 if (pci_domain_nr(dev->bus) == pdev_id->domain 322 && dev->bus->number == pdev_id->bus 323 && dev->devfn == pdev_id->devfn) 324 return 1; 325 326 /* Sometimes topmost bridge links to itself. */ 327 if (dev == dev->bus->self) 328 break; 329 } 330 331 return 0; 332} 333 334static int pcistub_match(struct pci_dev *dev) 335{ 336 struct pcistub_device_id *pdev_id; 337 unsigned long flags; 338 int found = 0; 339 340 spin_lock_irqsave(&device_ids_lock, flags); 341 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { 342 if (pcistub_match_one(dev, pdev_id)) { 343 found = 1; 344 break; 345 } 346 } 347 spin_unlock_irqrestore(&device_ids_lock, flags); 348 349 return found; 350} 351 352static int pcistub_init_device(struct pci_dev *dev) 353{ 354 struct xen_pcibk_dev_data *dev_data; 355 int err = 0; 356 357 dev_dbg(&dev->dev, "initializing...\n"); 358 359 /* The PCI backend is not intended to be a module (or to work with 360 * removable PCI devices (yet). If it were, xen_pcibk_config_free() 361 * would need to be called somewhere to free the memory allocated 362 * here and then to call kfree(pci_get_drvdata(psdev->dev)). 363 */ 364 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") 365 + strlen(pci_name(dev)) + 1, GFP_ATOMIC); 366 if (!dev_data) { 367 err = -ENOMEM; 368 goto out; 369 } 370 pci_set_drvdata(dev, dev_data); 371 372 /* 373 * Setup name for fake IRQ handler. It will only be enabled 374 * once the device is turned on by the guest. 375 */ 376 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); 377 378 dev_dbg(&dev->dev, "initializing config\n"); 379 380 init_waitqueue_head(&xen_pcibk_aer_wait_queue); 381 err = xen_pcibk_config_init_dev(dev); 382 if (err) 383 goto out; 384 385 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we 386 * must do this here because pcibios_enable_device may specify 387 * the pci device's true irq (and possibly its other resources) 388 * if they differ from what's in the configuration space. 389 * This makes the assumption that the device's resources won't 390 * change after this point (otherwise this code may break!) 391 */ 392 dev_dbg(&dev->dev, "enabling device\n"); 393 err = pci_enable_device(dev); 394 if (err) 395 goto config_release; 396 397 if (dev->msix_cap) { 398 struct physdev_pci_device ppdev = { 399 .seg = pci_domain_nr(dev->bus), 400 .bus = dev->bus->number, 401 .devfn = dev->devfn 402 }; 403 404 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); 405 if (err && err != -ENOSYS) 406 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", 407 err); 408 } 409 410 /* We need the device active to save the state. */ 411 dev_dbg(&dev->dev, "save state of device\n"); 412 pci_save_state(dev); 413 dev_data->pci_saved_state = pci_store_saved_state(dev); 414 if (!dev_data->pci_saved_state) 415 dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); 416 else { 417 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); 418 __pci_reset_function_locked(dev); 419 pci_restore_state(dev); 420 } 421 /* Now disable the device (this also ensures some private device 422 * data is setup before we export) 423 */ 424 dev_dbg(&dev->dev, "reset device\n"); 425 xen_pcibk_reset_device(dev); 426 427 pci_set_dev_assigned(dev); 428 return 0; 429 430config_release: 431 xen_pcibk_config_free_dev(dev); 432 433out: 434 pci_set_drvdata(dev, NULL); 435 kfree(dev_data); 436 return err; 437} 438 439/* 440 * Because some initialization still happens on 441 * devices during fs_initcall, we need to defer 442 * full initialization of our devices until 443 * device_initcall. 444 */ 445static int __init pcistub_init_devices_late(void) 446{ 447 struct pcistub_device *psdev; 448 unsigned long flags; 449 int err = 0; 450 451 spin_lock_irqsave(&pcistub_devices_lock, flags); 452 453 while (!list_empty(&seized_devices)) { 454 psdev = container_of(seized_devices.next, 455 struct pcistub_device, dev_list); 456 list_del(&psdev->dev_list); 457 458 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 459 460 err = pcistub_init_device(psdev->dev); 461 if (err) { 462 dev_err(&psdev->dev->dev, 463 "error %d initializing device\n", err); 464 kfree(psdev); 465 psdev = NULL; 466 } 467 468 spin_lock_irqsave(&pcistub_devices_lock, flags); 469 470 if (psdev) 471 list_add_tail(&psdev->dev_list, &pcistub_devices); 472 } 473 474 initialize_devices = 1; 475 476 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 477 478 return 0; 479} 480 481static int pcistub_seize(struct pci_dev *dev) 482{ 483 struct pcistub_device *psdev; 484 unsigned long flags; 485 int err = 0; 486 487 psdev = pcistub_device_alloc(dev); 488 if (!psdev) 489 return -ENOMEM; 490 491 spin_lock_irqsave(&pcistub_devices_lock, flags); 492 493 if (initialize_devices) { 494 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 495 496 /* don't want irqs disabled when calling pcistub_init_device */ 497 err = pcistub_init_device(psdev->dev); 498 499 spin_lock_irqsave(&pcistub_devices_lock, flags); 500 501 if (!err) 502 list_add(&psdev->dev_list, &pcistub_devices); 503 } else { 504 dev_dbg(&dev->dev, "deferring initialization\n"); 505 list_add(&psdev->dev_list, &seized_devices); 506 } 507 508 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 509 510 if (err) 511 pcistub_device_put(psdev); 512 513 return err; 514} 515 516/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or 517 * other functions that take the sysfs lock. */ 518static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) 519{ 520 int err = 0; 521 522 dev_dbg(&dev->dev, "probing...\n"); 523 524 if (pcistub_match(dev)) { 525 526 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL 527 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 528 dev_err(&dev->dev, "can't export pci devices that " 529 "don't have a normal (0) or bridge (1) " 530 "header type!\n"); 531 err = -ENODEV; 532 goto out; 533 } 534 535 dev_info(&dev->dev, "seizing device\n"); 536 err = pcistub_seize(dev); 537 } else 538 /* Didn't find the device */ 539 err = -ENODEV; 540 541out: 542 return err; 543} 544 545/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or 546 * other functions that take the sysfs lock. */ 547static void pcistub_remove(struct pci_dev *dev) 548{ 549 struct pcistub_device *psdev, *found_psdev = NULL; 550 unsigned long flags; 551 552 dev_dbg(&dev->dev, "removing\n"); 553 554 spin_lock_irqsave(&pcistub_devices_lock, flags); 555 556 xen_pcibk_config_quirk_release(dev); 557 558 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 559 if (psdev->dev == dev) { 560 found_psdev = psdev; 561 break; 562 } 563 } 564 565 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 566 567 if (found_psdev) { 568 dev_dbg(&dev->dev, "found device to remove %s\n", 569 found_psdev->pdev ? "- in-use" : ""); 570 571 if (found_psdev->pdev) { 572 int domid = xen_find_device_domain_owner(dev); 573 574 pr_warn("****** removing device %s while still in-use by domain %d! ******\n", 575 pci_name(found_psdev->dev), domid); 576 pr_warn("****** driver domain may still access this device's i/o resources!\n"); 577 pr_warn("****** shutdown driver domain before binding device\n"); 578 pr_warn("****** to other drivers or domains\n"); 579 580 /* N.B. This ends up calling pcistub_put_pci_dev which ends up 581 * doing the FLR. */ 582 xen_pcibk_release_pci_dev(found_psdev->pdev, 583 found_psdev->dev, 584 false /* caller holds the lock. */); 585 } 586 587 spin_lock_irqsave(&pcistub_devices_lock, flags); 588 list_del(&found_psdev->dev_list); 589 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 590 591 /* the final put for releasing from the list */ 592 pcistub_device_put(found_psdev); 593 } 594} 595 596static const struct pci_device_id pcistub_ids[] = { 597 { 598 .vendor = PCI_ANY_ID, 599 .device = PCI_ANY_ID, 600 .subvendor = PCI_ANY_ID, 601 .subdevice = PCI_ANY_ID, 602 }, 603 {0,}, 604}; 605 606#define PCI_NODENAME_MAX 40 607static void kill_domain_by_device(struct pcistub_device *psdev) 608{ 609 struct xenbus_transaction xbt; 610 int err; 611 char nodename[PCI_NODENAME_MAX]; 612 613 BUG_ON(!psdev); 614 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", 615 psdev->pdev->xdev->otherend_id); 616 617again: 618 err = xenbus_transaction_start(&xbt); 619 if (err) { 620 dev_err(&psdev->dev->dev, 621 "error %d when start xenbus transaction\n", err); 622 return; 623 } 624 /*PV AER handlers will set this flag*/ 625 xenbus_printf(xbt, nodename, "aerState" , "aerfail"); 626 err = xenbus_transaction_end(xbt, 0); 627 if (err) { 628 if (err == -EAGAIN) 629 goto again; 630 dev_err(&psdev->dev->dev, 631 "error %d when end xenbus transaction\n", err); 632 return; 633 } 634} 635 636/* For each aer recovery step error_detected, mmio_enabled, etc, front_end and 637 * backend need to have cooperation. In xen_pcibk, those steps will do similar 638 * jobs: send service request and waiting for front_end response. 639*/ 640static pci_ers_result_t common_process(struct pcistub_device *psdev, 641 pci_channel_state_t state, int aer_cmd, 642 pci_ers_result_t result) 643{ 644 pci_ers_result_t res = result; 645 struct xen_pcie_aer_op *aer_op; 646 struct xen_pcibk_device *pdev = psdev->pdev; 647 struct xen_pci_sharedinfo *sh_info = pdev->sh_info; 648 int ret; 649 650 /*with PV AER drivers*/ 651 aer_op = &(sh_info->aer_op); 652 aer_op->cmd = aer_cmd ; 653 /*useful for error_detected callback*/ 654 aer_op->err = state; 655 /*pcifront_end BDF*/ 656 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, 657 &aer_op->domain, &aer_op->bus, &aer_op->devfn); 658 if (!ret) { 659 dev_err(&psdev->dev->dev, 660 DRV_NAME ": failed to get pcifront device\n"); 661 return PCI_ERS_RESULT_NONE; 662 } 663 wmb(); 664 665 dev_dbg(&psdev->dev->dev, 666 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", 667 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); 668 /*local flag to mark there's aer request, xen_pcibk callback will use 669 * this flag to judge whether we need to check pci-front give aer 670 * service ack signal 671 */ 672 set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 673 674 /*It is possible that a pcifront conf_read_write ops request invokes 675 * the callback which cause the spurious execution of wake_up. 676 * Yet it is harmless and better than a spinlock here 677 */ 678 set_bit(_XEN_PCIB_active, 679 (unsigned long *)&sh_info->flags); 680 wmb(); 681 notify_remote_via_irq(pdev->evtchn_irq); 682 683 ret = wait_event_timeout(xen_pcibk_aer_wait_queue, 684 !(test_bit(_XEN_PCIB_active, (unsigned long *) 685 &sh_info->flags)), 300*HZ); 686 687 if (!ret) { 688 if (test_bit(_XEN_PCIB_active, 689 (unsigned long *)&sh_info->flags)) { 690 dev_err(&psdev->dev->dev, 691 "pcifront aer process not responding!\n"); 692 clear_bit(_XEN_PCIB_active, 693 (unsigned long *)&sh_info->flags); 694 aer_op->err = PCI_ERS_RESULT_NONE; 695 return res; 696 } 697 } 698 clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 699 700 if (test_bit(_XEN_PCIF_active, 701 (unsigned long *)&sh_info->flags)) { 702 dev_dbg(&psdev->dev->dev, 703 "schedule pci_conf service in " DRV_NAME "\n"); 704 xen_pcibk_test_and_schedule_op(psdev->pdev); 705 } 706 707 res = (pci_ers_result_t)aer_op->err; 708 return res; 709} 710 711/* 712* xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case 713* of the device driver could provide this service, and then wait for pcifront 714* ack. 715* @dev: pointer to PCI devices 716* return value is used by aer_core do_recovery policy 717*/ 718static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) 719{ 720 struct pcistub_device *psdev; 721 pci_ers_result_t result; 722 723 result = PCI_ERS_RESULT_RECOVERED; 724 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", 725 dev->bus->number, dev->devfn); 726 727 down_write(&pcistub_sem); 728 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 729 dev->bus->number, 730 PCI_SLOT(dev->devfn), 731 PCI_FUNC(dev->devfn)); 732 733 if (!psdev || !psdev->pdev) { 734 dev_err(&dev->dev, 735 DRV_NAME " device is not found/assigned\n"); 736 goto end; 737 } 738 739 if (!psdev->pdev->sh_info) { 740 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 741 " by HVM, kill it\n"); 742 kill_domain_by_device(psdev); 743 goto end; 744 } 745 746 if (!test_bit(_XEN_PCIB_AERHANDLER, 747 (unsigned long *)&psdev->pdev->sh_info->flags)) { 748 dev_err(&dev->dev, 749 "guest with no AER driver should have been killed\n"); 750 goto end; 751 } 752 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); 753 754 if (result == PCI_ERS_RESULT_NONE || 755 result == PCI_ERS_RESULT_DISCONNECT) { 756 dev_dbg(&dev->dev, 757 "No AER slot_reset service or disconnected!\n"); 758 kill_domain_by_device(psdev); 759 } 760end: 761 if (psdev) 762 pcistub_device_put(psdev); 763 up_write(&pcistub_sem); 764 return result; 765 766} 767 768 769/*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront 770* in case of the device driver could provide this service, and then wait 771* for pcifront ack 772* @dev: pointer to PCI devices 773* return value is used by aer_core do_recovery policy 774*/ 775 776static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) 777{ 778 struct pcistub_device *psdev; 779 pci_ers_result_t result; 780 781 result = PCI_ERS_RESULT_RECOVERED; 782 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", 783 dev->bus->number, dev->devfn); 784 785 down_write(&pcistub_sem); 786 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 787 dev->bus->number, 788 PCI_SLOT(dev->devfn), 789 PCI_FUNC(dev->devfn)); 790 791 if (!psdev || !psdev->pdev) { 792 dev_err(&dev->dev, 793 DRV_NAME " device is not found/assigned\n"); 794 goto end; 795 } 796 797 if (!psdev->pdev->sh_info) { 798 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 799 " by HVM, kill it\n"); 800 kill_domain_by_device(psdev); 801 goto end; 802 } 803 804 if (!test_bit(_XEN_PCIB_AERHANDLER, 805 (unsigned long *)&psdev->pdev->sh_info->flags)) { 806 dev_err(&dev->dev, 807 "guest with no AER driver should have been killed\n"); 808 goto end; 809 } 810 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); 811 812 if (result == PCI_ERS_RESULT_NONE || 813 result == PCI_ERS_RESULT_DISCONNECT) { 814 dev_dbg(&dev->dev, 815 "No AER mmio_enabled service or disconnected!\n"); 816 kill_domain_by_device(psdev); 817 } 818end: 819 if (psdev) 820 pcistub_device_put(psdev); 821 up_write(&pcistub_sem); 822 return result; 823} 824 825/*xen_pcibk_error_detected: it will send the error_detected request to pcifront 826* in case of the device driver could provide this service, and then wait 827* for pcifront ack. 828* @dev: pointer to PCI devices 829* @error: the current PCI connection state 830* return value is used by aer_core do_recovery policy 831*/ 832 833static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, 834 pci_channel_state_t error) 835{ 836 struct pcistub_device *psdev; 837 pci_ers_result_t result; 838 839 result = PCI_ERS_RESULT_CAN_RECOVER; 840 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", 841 dev->bus->number, dev->devfn); 842 843 down_write(&pcistub_sem); 844 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 845 dev->bus->number, 846 PCI_SLOT(dev->devfn), 847 PCI_FUNC(dev->devfn)); 848 849 if (!psdev || !psdev->pdev) { 850 dev_err(&dev->dev, 851 DRV_NAME " device is not found/assigned\n"); 852 goto end; 853 } 854 855 if (!psdev->pdev->sh_info) { 856 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 857 " by HVM, kill it\n"); 858 kill_domain_by_device(psdev); 859 goto end; 860 } 861 862 /*Guest owns the device yet no aer handler regiested, kill guest*/ 863 if (!test_bit(_XEN_PCIB_AERHANDLER, 864 (unsigned long *)&psdev->pdev->sh_info->flags)) { 865 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); 866 kill_domain_by_device(psdev); 867 goto end; 868 } 869 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); 870 871 if (result == PCI_ERS_RESULT_NONE || 872 result == PCI_ERS_RESULT_DISCONNECT) { 873 dev_dbg(&dev->dev, 874 "No AER error_detected service or disconnected!\n"); 875 kill_domain_by_device(psdev); 876 } 877end: 878 if (psdev) 879 pcistub_device_put(psdev); 880 up_write(&pcistub_sem); 881 return result; 882} 883 884/*xen_pcibk_error_resume: it will send the error_resume request to pcifront 885* in case of the device driver could provide this service, and then wait 886* for pcifront ack. 887* @dev: pointer to PCI devices 888*/ 889 890static void xen_pcibk_error_resume(struct pci_dev *dev) 891{ 892 struct pcistub_device *psdev; 893 894 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", 895 dev->bus->number, dev->devfn); 896 897 down_write(&pcistub_sem); 898 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 899 dev->bus->number, 900 PCI_SLOT(dev->devfn), 901 PCI_FUNC(dev->devfn)); 902 903 if (!psdev || !psdev->pdev) { 904 dev_err(&dev->dev, 905 DRV_NAME " device is not found/assigned\n"); 906 goto end; 907 } 908 909 if (!psdev->pdev->sh_info) { 910 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 911 " by HVM, kill it\n"); 912 kill_domain_by_device(psdev); 913 goto end; 914 } 915 916 if (!test_bit(_XEN_PCIB_AERHANDLER, 917 (unsigned long *)&psdev->pdev->sh_info->flags)) { 918 dev_err(&dev->dev, 919 "guest with no AER driver should have been killed\n"); 920 kill_domain_by_device(psdev); 921 goto end; 922 } 923 common_process(psdev, 1, XEN_PCI_OP_aer_resume, 924 PCI_ERS_RESULT_RECOVERED); 925end: 926 if (psdev) 927 pcistub_device_put(psdev); 928 up_write(&pcistub_sem); 929 return; 930} 931 932/*add xen_pcibk AER handling*/ 933static const struct pci_error_handlers xen_pcibk_error_handler = { 934 .error_detected = xen_pcibk_error_detected, 935 .mmio_enabled = xen_pcibk_mmio_enabled, 936 .slot_reset = xen_pcibk_slot_reset, 937 .resume = xen_pcibk_error_resume, 938}; 939 940/* 941 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't 942 * for a normal device. I don't want it to be loaded automatically. 943 */ 944 945static struct pci_driver xen_pcibk_pci_driver = { 946 /* The name should be xen_pciback, but until the tools are updated 947 * we will keep it as pciback. */ 948 .name = "pciback", 949 .id_table = pcistub_ids, 950 .probe = pcistub_probe, 951 .remove = pcistub_remove, 952 .err_handler = &xen_pcibk_error_handler, 953}; 954 955static inline int str_to_slot(const char *buf, int *domain, int *bus, 956 int *slot, int *func) 957{ 958 int parsed = 0; 959 960 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, 961 &parsed)) { 962 case 3: 963 *func = -1; 964 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); 965 break; 966 case 2: 967 *slot = *func = -1; 968 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); 969 break; 970 } 971 if (parsed && !buf[parsed]) 972 return 0; 973 974 /* try again without domain */ 975 *domain = 0; 976 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { 977 case 2: 978 *func = -1; 979 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); 980 break; 981 case 1: 982 *slot = *func = -1; 983 sscanf(buf, " %x:*.* %n", bus, &parsed); 984 break; 985 } 986 if (parsed && !buf[parsed]) 987 return 0; 988 989 return -EINVAL; 990} 991 992static inline int str_to_quirk(const char *buf, int *domain, int *bus, int 993 *slot, int *func, int *reg, int *size, int *mask) 994{ 995 int parsed = 0; 996 997 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, 998 reg, size, mask, &parsed); 999 if (parsed && !buf[parsed]) 1000 return 0; 1001 1002 /* try again without domain */ 1003 *domain = 0; 1004 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, 1005 mask, &parsed); 1006 if (parsed && !buf[parsed]) 1007 return 0; 1008 1009 return -EINVAL; 1010} 1011 1012static int pcistub_device_id_add(int domain, int bus, int slot, int func) 1013{ 1014 struct pcistub_device_id *pci_dev_id; 1015 unsigned long flags; 1016 int rc = 0, devfn = PCI_DEVFN(slot, func); 1017 1018 if (slot < 0) { 1019 for (slot = 0; !rc && slot < 32; ++slot) 1020 rc = pcistub_device_id_add(domain, bus, slot, func); 1021 return rc; 1022 } 1023 1024 if (func < 0) { 1025 for (func = 0; !rc && func < 8; ++func) 1026 rc = pcistub_device_id_add(domain, bus, slot, func); 1027 return rc; 1028 } 1029 1030 if (( 1031#if !defined(MODULE) /* pci_domains_supported is not being exported */ \ 1032 || !defined(CONFIG_PCI_DOMAINS) 1033 !pci_domains_supported ? domain : 1034#endif 1035 domain < 0 || domain > 0xffff) 1036 || bus < 0 || bus > 0xff 1037 || PCI_SLOT(devfn) != slot 1038 || PCI_FUNC(devfn) != func) 1039 return -EINVAL; 1040 1041 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); 1042 if (!pci_dev_id) 1043 return -ENOMEM; 1044 1045 pci_dev_id->domain = domain; 1046 pci_dev_id->bus = bus; 1047 pci_dev_id->devfn = devfn; 1048 1049 pr_debug("wants to seize %04x:%02x:%02x.%d\n", 1050 domain, bus, slot, func); 1051 1052 spin_lock_irqsave(&device_ids_lock, flags); 1053 list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids); 1054 spin_unlock_irqrestore(&device_ids_lock, flags); 1055 1056 return 0; 1057} 1058 1059static int pcistub_device_id_remove(int domain, int bus, int slot, int func) 1060{ 1061 struct pcistub_device_id *pci_dev_id, *t; 1062 int err = -ENOENT; 1063 unsigned long flags; 1064 1065 spin_lock_irqsave(&device_ids_lock, flags); 1066 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, 1067 slot_list) { 1068 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus 1069 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) 1070 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { 1071 /* Don't break; here because it's possible the same 1072 * slot could be in the list more than once 1073 */ 1074 list_del(&pci_dev_id->slot_list); 1075 kfree(pci_dev_id); 1076 1077 err = 0; 1078 1079 pr_debug("removed %04x:%02x:%02x.%d from seize list\n", 1080 domain, bus, slot, func); 1081 } 1082 } 1083 spin_unlock_irqrestore(&device_ids_lock, flags); 1084 1085 return err; 1086} 1087 1088static int pcistub_reg_add(int domain, int bus, int slot, int func, 1089 unsigned int reg, unsigned int size, 1090 unsigned int mask) 1091{ 1092 int err = 0; 1093 struct pcistub_device *psdev; 1094 struct pci_dev *dev; 1095 struct config_field *field; 1096 1097 if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) 1098 return -EINVAL; 1099 1100 psdev = pcistub_device_find(domain, bus, slot, func); 1101 if (!psdev) { 1102 err = -ENODEV; 1103 goto out; 1104 } 1105 dev = psdev->dev; 1106 1107 field = kzalloc(sizeof(*field), GFP_ATOMIC); 1108 if (!field) { 1109 err = -ENOMEM; 1110 goto out; 1111 } 1112 1113 field->offset = reg; 1114 field->size = size; 1115 field->mask = mask; 1116 field->init = NULL; 1117 field->reset = NULL; 1118 field->release = NULL; 1119 field->clean = xen_pcibk_config_field_free; 1120 1121 err = xen_pcibk_config_quirks_add_field(dev, field); 1122 if (err) 1123 kfree(field); 1124out: 1125 if (psdev) 1126 pcistub_device_put(psdev); 1127 return err; 1128} 1129 1130static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf, 1131 size_t count) 1132{ 1133 int domain, bus, slot, func; 1134 int err; 1135 1136 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1137 if (err) 1138 goto out; 1139 1140 err = pcistub_device_id_add(domain, bus, slot, func); 1141 1142out: 1143 if (!err) 1144 err = count; 1145 return err; 1146} 1147static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add); 1148 1149static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf, 1150 size_t count) 1151{ 1152 int domain, bus, slot, func; 1153 int err; 1154 1155 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1156 if (err) 1157 goto out; 1158 1159 err = pcistub_device_id_remove(domain, bus, slot, func); 1160 1161out: 1162 if (!err) 1163 err = count; 1164 return err; 1165} 1166static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove); 1167 1168static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) 1169{ 1170 struct pcistub_device_id *pci_dev_id; 1171 size_t count = 0; 1172 unsigned long flags; 1173 1174 spin_lock_irqsave(&device_ids_lock, flags); 1175 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { 1176 if (count >= PAGE_SIZE) 1177 break; 1178 1179 count += scnprintf(buf + count, PAGE_SIZE - count, 1180 "%04x:%02x:%02x.%d\n", 1181 pci_dev_id->domain, pci_dev_id->bus, 1182 PCI_SLOT(pci_dev_id->devfn), 1183 PCI_FUNC(pci_dev_id->devfn)); 1184 } 1185 spin_unlock_irqrestore(&device_ids_lock, flags); 1186 1187 return count; 1188} 1189static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); 1190 1191static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf) 1192{ 1193 struct pcistub_device *psdev; 1194 struct xen_pcibk_dev_data *dev_data; 1195 size_t count = 0; 1196 unsigned long flags; 1197 1198 spin_lock_irqsave(&pcistub_devices_lock, flags); 1199 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1200 if (count >= PAGE_SIZE) 1201 break; 1202 if (!psdev->dev) 1203 continue; 1204 dev_data = pci_get_drvdata(psdev->dev); 1205 if (!dev_data) 1206 continue; 1207 count += 1208 scnprintf(buf + count, PAGE_SIZE - count, 1209 "%s:%s:%sing:%ld\n", 1210 pci_name(psdev->dev), 1211 dev_data->isr_on ? "on" : "off", 1212 dev_data->ack_intr ? "ack" : "not ack", 1213 dev_data->handled); 1214 } 1215 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1216 return count; 1217} 1218static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL); 1219 1220static ssize_t pcistub_irq_handler_switch(struct device_driver *drv, 1221 const char *buf, 1222 size_t count) 1223{ 1224 struct pcistub_device *psdev; 1225 struct xen_pcibk_dev_data *dev_data; 1226 int domain, bus, slot, func; 1227 int err; 1228 1229 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1230 if (err) 1231 return err; 1232 1233 psdev = pcistub_device_find(domain, bus, slot, func); 1234 if (!psdev) { 1235 err = -ENOENT; 1236 goto out; 1237 } 1238 1239 dev_data = pci_get_drvdata(psdev->dev); 1240 if (!dev_data) { 1241 err = -ENOENT; 1242 goto out; 1243 } 1244 1245 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", 1246 dev_data->irq_name, dev_data->isr_on, 1247 !dev_data->isr_on); 1248 1249 dev_data->isr_on = !(dev_data->isr_on); 1250 if (dev_data->isr_on) 1251 dev_data->ack_intr = 1; 1252out: 1253 if (psdev) 1254 pcistub_device_put(psdev); 1255 if (!err) 1256 err = count; 1257 return err; 1258} 1259static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL, 1260 pcistub_irq_handler_switch); 1261 1262static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, 1263 size_t count) 1264{ 1265 int domain, bus, slot, func, reg, size, mask; 1266 int err; 1267 1268 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, 1269 &mask); 1270 if (err) 1271 goto out; 1272 1273 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); 1274 1275out: 1276 if (!err) 1277 err = count; 1278 return err; 1279} 1280 1281static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf) 1282{ 1283 int count = 0; 1284 unsigned long flags; 1285 struct xen_pcibk_config_quirk *quirk; 1286 struct xen_pcibk_dev_data *dev_data; 1287 const struct config_field *field; 1288 const struct config_field_entry *cfg_entry; 1289 1290 spin_lock_irqsave(&device_ids_lock, flags); 1291 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { 1292 if (count >= PAGE_SIZE) 1293 goto out; 1294 1295 count += scnprintf(buf + count, PAGE_SIZE - count, 1296 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", 1297 quirk->pdev->bus->number, 1298 PCI_SLOT(quirk->pdev->devfn), 1299 PCI_FUNC(quirk->pdev->devfn), 1300 quirk->devid.vendor, quirk->devid.device, 1301 quirk->devid.subvendor, 1302 quirk->devid.subdevice); 1303 1304 dev_data = pci_get_drvdata(quirk->pdev); 1305 1306 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { 1307 field = cfg_entry->field; 1308 if (count >= PAGE_SIZE) 1309 goto out; 1310 1311 count += scnprintf(buf + count, PAGE_SIZE - count, 1312 "\t\t%08x:%01x:%08x\n", 1313 cfg_entry->base_offset + 1314 field->offset, field->size, 1315 field->mask); 1316 } 1317 } 1318 1319out: 1320 spin_unlock_irqrestore(&device_ids_lock, flags); 1321 1322 return count; 1323} 1324static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, 1325 pcistub_quirk_add); 1326 1327static ssize_t permissive_add(struct device_driver *drv, const char *buf, 1328 size_t count) 1329{ 1330 int domain, bus, slot, func; 1331 int err; 1332 struct pcistub_device *psdev; 1333 struct xen_pcibk_dev_data *dev_data; 1334 1335 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1336 if (err) 1337 goto out; 1338 1339 psdev = pcistub_device_find(domain, bus, slot, func); 1340 if (!psdev) { 1341 err = -ENODEV; 1342 goto out; 1343 } 1344 1345 dev_data = pci_get_drvdata(psdev->dev); 1346 /* the driver data for a device should never be null at this point */ 1347 if (!dev_data) { 1348 err = -ENXIO; 1349 goto release; 1350 } 1351 if (!dev_data->permissive) { 1352 dev_data->permissive = 1; 1353 /* Let user know that what they're doing could be unsafe */ 1354 dev_warn(&psdev->dev->dev, "enabling permissive mode " 1355 "configuration space accesses!\n"); 1356 dev_warn(&psdev->dev->dev, 1357 "permissive mode is potentially unsafe!\n"); 1358 } 1359release: 1360 pcistub_device_put(psdev); 1361out: 1362 if (!err) 1363 err = count; 1364 return err; 1365} 1366 1367static ssize_t permissive_show(struct device_driver *drv, char *buf) 1368{ 1369 struct pcistub_device *psdev; 1370 struct xen_pcibk_dev_data *dev_data; 1371 size_t count = 0; 1372 unsigned long flags; 1373 spin_lock_irqsave(&pcistub_devices_lock, flags); 1374 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1375 if (count >= PAGE_SIZE) 1376 break; 1377 if (!psdev->dev) 1378 continue; 1379 dev_data = pci_get_drvdata(psdev->dev); 1380 if (!dev_data || !dev_data->permissive) 1381 continue; 1382 count += 1383 scnprintf(buf + count, PAGE_SIZE - count, "%s\n", 1384 pci_name(psdev->dev)); 1385 } 1386 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1387 return count; 1388} 1389static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, 1390 permissive_add); 1391 1392static void pcistub_exit(void) 1393{ 1394 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); 1395 driver_remove_file(&xen_pcibk_pci_driver.driver, 1396 &driver_attr_remove_slot); 1397 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); 1398 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); 1399 driver_remove_file(&xen_pcibk_pci_driver.driver, 1400 &driver_attr_permissive); 1401 driver_remove_file(&xen_pcibk_pci_driver.driver, 1402 &driver_attr_irq_handlers); 1403 driver_remove_file(&xen_pcibk_pci_driver.driver, 1404 &driver_attr_irq_handler_state); 1405 pci_unregister_driver(&xen_pcibk_pci_driver); 1406} 1407 1408static int __init pcistub_init(void) 1409{ 1410 int pos = 0; 1411 int err = 0; 1412 int domain, bus, slot, func; 1413 int parsed; 1414 1415 if (pci_devs_to_hide && *pci_devs_to_hide) { 1416 do { 1417 parsed = 0; 1418 1419 err = sscanf(pci_devs_to_hide + pos, 1420 " (%x:%x:%x.%x) %n", 1421 &domain, &bus, &slot, &func, &parsed); 1422 switch (err) { 1423 case 3: 1424 func = -1; 1425 sscanf(pci_devs_to_hide + pos, 1426 " (%x:%x:%x.*) %n", 1427 &domain, &bus, &slot, &parsed); 1428 break; 1429 case 2: 1430 slot = func = -1; 1431 sscanf(pci_devs_to_hide + pos, 1432 " (%x:%x:*.*) %n", 1433 &domain, &bus, &parsed); 1434 break; 1435 } 1436 1437 if (!parsed) { 1438 domain = 0; 1439 err = sscanf(pci_devs_to_hide + pos, 1440 " (%x:%x.%x) %n", 1441 &bus, &slot, &func, &parsed); 1442 switch (err) { 1443 case 2: 1444 func = -1; 1445 sscanf(pci_devs_to_hide + pos, 1446 " (%x:%x.*) %n", 1447 &bus, &slot, &parsed); 1448 break; 1449 case 1: 1450 slot = func = -1; 1451 sscanf(pci_devs_to_hide + pos, 1452 " (%x:*.*) %n", 1453 &bus, &parsed); 1454 break; 1455 } 1456 } 1457 1458 if (parsed <= 0) 1459 goto parse_error; 1460 1461 err = pcistub_device_id_add(domain, bus, slot, func); 1462 if (err) 1463 goto out; 1464 1465 pos += parsed; 1466 } while (pci_devs_to_hide[pos]); 1467 } 1468 1469 /* If we're the first PCI Device Driver to register, we're the 1470 * first one to get offered PCI devices as they become 1471 * available (and thus we can be the first to grab them) 1472 */ 1473 err = pci_register_driver(&xen_pcibk_pci_driver); 1474 if (err < 0) 1475 goto out; 1476 1477 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1478 &driver_attr_new_slot); 1479 if (!err) 1480 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1481 &driver_attr_remove_slot); 1482 if (!err) 1483 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1484 &driver_attr_slots); 1485 if (!err) 1486 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1487 &driver_attr_quirks); 1488 if (!err) 1489 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1490 &driver_attr_permissive); 1491 1492 if (!err) 1493 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1494 &driver_attr_irq_handlers); 1495 if (!err) 1496 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1497 &driver_attr_irq_handler_state); 1498 if (err) 1499 pcistub_exit(); 1500 1501out: 1502 return err; 1503 1504parse_error: 1505 pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", 1506 pci_devs_to_hide + pos); 1507 return -EINVAL; 1508} 1509 1510#ifndef MODULE 1511/* 1512 * fs_initcall happens before device_initcall 1513 * so xen_pcibk *should* get called first (b/c we 1514 * want to suck up any device before other drivers 1515 * get a chance by being the first pci device 1516 * driver to register) 1517 */ 1518fs_initcall(pcistub_init); 1519#endif 1520 1521#ifdef CONFIG_PCI_IOV 1522static struct pcistub_device *find_vfs(const struct pci_dev *pdev) 1523{ 1524 struct pcistub_device *psdev = NULL; 1525 unsigned long flags; 1526 bool found = false; 1527 1528 spin_lock_irqsave(&pcistub_devices_lock, flags); 1529 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1530 if (!psdev->pdev && psdev->dev != pdev 1531 && pci_physfn(psdev->dev) == pdev) { 1532 found = true; 1533 break; 1534 } 1535 } 1536 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1537 if (found) 1538 return psdev; 1539 return NULL; 1540} 1541 1542static int pci_stub_notifier(struct notifier_block *nb, 1543 unsigned long action, void *data) 1544{ 1545 struct device *dev = data; 1546 const struct pci_dev *pdev = to_pci_dev(dev); 1547 1548 if (action != BUS_NOTIFY_UNBIND_DRIVER) 1549 return NOTIFY_DONE; 1550 1551 if (!pdev->is_physfn) 1552 return NOTIFY_DONE; 1553 1554 for (;;) { 1555 struct pcistub_device *psdev = find_vfs(pdev); 1556 if (!psdev) 1557 break; 1558 device_release_driver(&psdev->dev->dev); 1559 } 1560 return NOTIFY_DONE; 1561} 1562 1563static struct notifier_block pci_stub_nb = { 1564 .notifier_call = pci_stub_notifier, 1565}; 1566#endif 1567 1568static int __init xen_pcibk_init(void) 1569{ 1570 int err; 1571 1572 if (!xen_initial_domain()) 1573 return -ENODEV; 1574 1575 err = xen_pcibk_config_init(); 1576 if (err) 1577 return err; 1578 1579#ifdef MODULE 1580 err = pcistub_init(); 1581 if (err < 0) 1582 return err; 1583#endif 1584 1585 pcistub_init_devices_late(); 1586 err = xen_pcibk_xenbus_register(); 1587 if (err) 1588 pcistub_exit(); 1589#ifdef CONFIG_PCI_IOV 1590 else 1591 bus_register_notifier(&pci_bus_type, &pci_stub_nb); 1592#endif 1593 1594 return err; 1595} 1596 1597static void __exit xen_pcibk_cleanup(void) 1598{ 1599#ifdef CONFIG_PCI_IOV 1600 bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); 1601#endif 1602 xen_pcibk_xenbus_unregister(); 1603 pcistub_exit(); 1604} 1605 1606module_init(xen_pcibk_init); 1607module_exit(xen_pcibk_cleanup); 1608 1609MODULE_LICENSE("Dual BSD/GPL"); 1610MODULE_ALIAS("xen-backend:pci"); 1611