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 28 #define PCISTUB_DRIVER_NAME "pciback" 29 30 static char *pci_devs_to_hide; 31 wait_queue_head_t xen_pcibk_aer_wait_queue; 32 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, 33 * We want to avoid in middle of AER ops, xen_pcibk devices is being removed 34 */ 35 static DECLARE_RWSEM(pcistub_sem); 36 module_param_named(hide, pci_devs_to_hide, charp, 0444); 37 38 struct pcistub_device_id { 39 struct list_head slot_list; 40 int domain; 41 unsigned char bus; 42 unsigned int devfn; 43 }; 44 static LIST_HEAD(pcistub_device_ids); 45 static DEFINE_SPINLOCK(device_ids_lock); 46 47 struct pcistub_device { 48 struct kref kref; 49 struct list_head dev_list; 50 spinlock_t lock; 51 52 struct pci_dev *dev; 53 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ 54 }; 55 56 /* Access to pcistub_devices & seized_devices lists and the initialize_devices 57 * flag must be locked with pcistub_devices_lock 58 */ 59 static DEFINE_SPINLOCK(pcistub_devices_lock); 60 static LIST_HEAD(pcistub_devices); 61 62 /* wait for device_initcall before initializing our devices 63 * (see pcistub_init_devices_late) 64 */ 65 static int initialize_devices; 66 static LIST_HEAD(seized_devices); 67 68 static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) 69 { 70 struct pcistub_device *psdev; 71 72 dev_dbg(&dev->dev, "pcistub_device_alloc\n"); 73 74 psdev = kzalloc(sizeof(*psdev), GFP_KERNEL); 75 if (!psdev) 76 return NULL; 77 78 psdev->dev = pci_dev_get(dev); 79 if (!psdev->dev) { 80 kfree(psdev); 81 return NULL; 82 } 83 84 kref_init(&psdev->kref); 85 spin_lock_init(&psdev->lock); 86 87 return psdev; 88 } 89 90 /* Don't call this directly as it's called by pcistub_device_put */ 91 static void pcistub_device_release(struct kref *kref) 92 { 93 struct pcistub_device *psdev; 94 struct pci_dev *dev; 95 struct xen_pcibk_dev_data *dev_data; 96 97 psdev = container_of(kref, struct pcistub_device, kref); 98 dev = psdev->dev; 99 dev_data = pci_get_drvdata(dev); 100 101 dev_dbg(&dev->dev, "pcistub_device_release\n"); 102 103 xen_unregister_device_domain_owner(dev); 104 105 /* Call the reset function which does not take lock as this 106 * is called from "unbind" which takes a device_lock mutex. 107 */ 108 __pci_reset_function_locked(dev); 109 if (dev_data && 110 pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) 111 dev_info(&dev->dev, "Could not reload PCI state\n"); 112 else 113 pci_restore_state(dev); 114 115 if (dev->msix_cap) { 116 struct physdev_pci_device ppdev = { 117 .seg = pci_domain_nr(dev->bus), 118 .bus = dev->bus->number, 119 .devfn = dev->devfn 120 }; 121 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix, 122 &ppdev); 123 124 if (err && err != -ENOSYS) 125 dev_warn(&dev->dev, "MSI-X release failed (%d)\n", 126 err); 127 } 128 129 /* Disable the device */ 130 xen_pcibk_reset_device(dev); 131 132 kfree(dev_data); 133 pci_set_drvdata(dev, NULL); 134 135 /* Clean-up the device */ 136 xen_pcibk_config_free_dyn_fields(dev); 137 xen_pcibk_config_free_dev(dev); 138 139 pci_clear_dev_assigned(dev); 140 pci_dev_put(dev); 141 142 kfree(psdev); 143 } 144 145 static inline void pcistub_device_get(struct pcistub_device *psdev) 146 { 147 kref_get(&psdev->kref); 148 } 149 150 static inline void pcistub_device_put(struct pcistub_device *psdev) 151 { 152 kref_put(&psdev->kref, pcistub_device_release); 153 } 154 155 static struct pcistub_device *pcistub_device_find_locked(int domain, int bus, 156 int slot, int func) 157 { 158 struct pcistub_device *psdev; 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 return psdev; 167 } 168 } 169 170 return NULL; 171 } 172 173 static struct pcistub_device *pcistub_device_find(int domain, int bus, 174 int slot, int func) 175 { 176 struct pcistub_device *psdev; 177 unsigned long flags; 178 179 spin_lock_irqsave(&pcistub_devices_lock, flags); 180 181 psdev = pcistub_device_find_locked(domain, bus, slot, func); 182 if (psdev) 183 pcistub_device_get(psdev); 184 185 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 186 return psdev; 187 } 188 189 static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, 190 struct pcistub_device *psdev) 191 { 192 struct pci_dev *pci_dev = NULL; 193 unsigned long flags; 194 195 pcistub_device_get(psdev); 196 197 spin_lock_irqsave(&psdev->lock, flags); 198 if (!psdev->pdev) { 199 psdev->pdev = pdev; 200 pci_dev = psdev->dev; 201 } 202 spin_unlock_irqrestore(&psdev->lock, flags); 203 204 if (!pci_dev) 205 pcistub_device_put(psdev); 206 207 return pci_dev; 208 } 209 210 struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, 211 int domain, int bus, 212 int slot, int func) 213 { 214 struct pcistub_device *psdev; 215 struct pci_dev *found_dev = NULL; 216 unsigned long flags; 217 218 spin_lock_irqsave(&pcistub_devices_lock, flags); 219 220 psdev = pcistub_device_find_locked(domain, bus, slot, func); 221 if (psdev) 222 found_dev = pcistub_device_get_pci_dev(pdev, psdev); 223 224 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 225 return found_dev; 226 } 227 228 struct pci_dev *pcistub_get_pci_dev(struct xen_pcibk_device *pdev, 229 struct pci_dev *dev) 230 { 231 struct pcistub_device *psdev; 232 struct pci_dev *found_dev = NULL; 233 unsigned long flags; 234 235 spin_lock_irqsave(&pcistub_devices_lock, flags); 236 237 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 238 if (psdev->dev == dev) { 239 found_dev = pcistub_device_get_pci_dev(pdev, psdev); 240 break; 241 } 242 } 243 244 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 245 return found_dev; 246 } 247 248 /* 249 * Called when: 250 * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device 251 * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove 252 * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove 253 * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove 254 * 255 * As such we have to be careful. 256 * 257 * To make this easier, the caller has to hold the device lock. 258 */ 259 void pcistub_put_pci_dev(struct pci_dev *dev) 260 { 261 struct pcistub_device *psdev, *found_psdev = NULL; 262 unsigned long flags; 263 struct xen_pcibk_dev_data *dev_data; 264 int ret; 265 266 spin_lock_irqsave(&pcistub_devices_lock, flags); 267 268 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 269 if (psdev->dev == dev) { 270 found_psdev = psdev; 271 break; 272 } 273 } 274 275 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 276 if (WARN_ON(!found_psdev)) 277 return; 278 279 /*hold this lock for avoiding breaking link between 280 * pcistub and xen_pcibk when AER is in processing 281 */ 282 down_write(&pcistub_sem); 283 /* Cleanup our device 284 * (so it's ready for the next domain) 285 */ 286 device_lock_assert(&dev->dev); 287 __pci_reset_function_locked(dev); 288 289 dev_data = pci_get_drvdata(dev); 290 ret = pci_load_saved_state(dev, dev_data->pci_saved_state); 291 if (!ret) { 292 /* 293 * The usual sequence is pci_save_state & pci_restore_state 294 * but the guest might have messed the configuration space up. 295 * Use the initial version (when device was bound to us). 296 */ 297 pci_restore_state(dev); 298 } else 299 dev_info(&dev->dev, "Could not reload PCI state\n"); 300 /* This disables the device. */ 301 xen_pcibk_reset_device(dev); 302 303 /* And cleanup up our emulated fields. */ 304 xen_pcibk_config_reset_dev(dev); 305 xen_pcibk_config_free_dyn_fields(dev); 306 307 dev_data->allow_interrupt_control = 0; 308 309 xen_unregister_device_domain_owner(dev); 310 311 spin_lock_irqsave(&found_psdev->lock, flags); 312 found_psdev->pdev = NULL; 313 spin_unlock_irqrestore(&found_psdev->lock, flags); 314 315 pcistub_device_put(found_psdev); 316 up_write(&pcistub_sem); 317 } 318 319 static int pcistub_match_one(struct pci_dev *dev, 320 struct pcistub_device_id *pdev_id) 321 { 322 /* Match the specified device by domain, bus, slot, func and also if 323 * any of the device's parent bridges match. 324 */ 325 for (; dev != NULL; dev = dev->bus->self) { 326 if (pci_domain_nr(dev->bus) == pdev_id->domain 327 && dev->bus->number == pdev_id->bus 328 && dev->devfn == pdev_id->devfn) 329 return 1; 330 331 /* Sometimes topmost bridge links to itself. */ 332 if (dev == dev->bus->self) 333 break; 334 } 335 336 return 0; 337 } 338 339 static int pcistub_match(struct pci_dev *dev) 340 { 341 struct pcistub_device_id *pdev_id; 342 unsigned long flags; 343 int found = 0; 344 345 spin_lock_irqsave(&device_ids_lock, flags); 346 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { 347 if (pcistub_match_one(dev, pdev_id)) { 348 found = 1; 349 break; 350 } 351 } 352 spin_unlock_irqrestore(&device_ids_lock, flags); 353 354 return found; 355 } 356 357 static int pcistub_init_device(struct pci_dev *dev) 358 { 359 struct xen_pcibk_dev_data *dev_data; 360 int err = 0; 361 362 dev_dbg(&dev->dev, "initializing...\n"); 363 364 /* The PCI backend is not intended to be a module (or to work with 365 * removable PCI devices (yet). If it were, xen_pcibk_config_free() 366 * would need to be called somewhere to free the memory allocated 367 * here and then to call kfree(pci_get_drvdata(psdev->dev)). 368 */ 369 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") 370 + strlen(pci_name(dev)) + 1, GFP_KERNEL); 371 if (!dev_data) { 372 err = -ENOMEM; 373 goto out; 374 } 375 pci_set_drvdata(dev, dev_data); 376 377 /* 378 * Setup name for fake IRQ handler. It will only be enabled 379 * once the device is turned on by the guest. 380 */ 381 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); 382 383 dev_dbg(&dev->dev, "initializing config\n"); 384 385 init_waitqueue_head(&xen_pcibk_aer_wait_queue); 386 err = xen_pcibk_config_init_dev(dev); 387 if (err) 388 goto out; 389 390 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we 391 * must do this here because pcibios_enable_device may specify 392 * the pci device's true irq (and possibly its other resources) 393 * if they differ from what's in the configuration space. 394 * This makes the assumption that the device's resources won't 395 * change after this point (otherwise this code may break!) 396 */ 397 dev_dbg(&dev->dev, "enabling device\n"); 398 err = pci_enable_device(dev); 399 if (err) 400 goto config_release; 401 402 if (dev->msix_cap) { 403 struct physdev_pci_device ppdev = { 404 .seg = pci_domain_nr(dev->bus), 405 .bus = dev->bus->number, 406 .devfn = dev->devfn 407 }; 408 409 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); 410 if (err && err != -ENOSYS) 411 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", 412 err); 413 } 414 415 /* We need the device active to save the state. */ 416 dev_dbg(&dev->dev, "save state of device\n"); 417 pci_save_state(dev); 418 dev_data->pci_saved_state = pci_store_saved_state(dev); 419 if (!dev_data->pci_saved_state) 420 dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); 421 else { 422 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); 423 __pci_reset_function_locked(dev); 424 pci_restore_state(dev); 425 } 426 /* Now disable the device (this also ensures some private device 427 * data is setup before we export) 428 */ 429 dev_dbg(&dev->dev, "reset device\n"); 430 xen_pcibk_reset_device(dev); 431 432 pci_set_dev_assigned(dev); 433 return 0; 434 435 config_release: 436 xen_pcibk_config_free_dev(dev); 437 438 out: 439 pci_set_drvdata(dev, NULL); 440 kfree(dev_data); 441 return err; 442 } 443 444 /* 445 * Because some initialization still happens on 446 * devices during fs_initcall, we need to defer 447 * full initialization of our devices until 448 * device_initcall. 449 */ 450 static int __init pcistub_init_devices_late(void) 451 { 452 struct pcistub_device *psdev; 453 unsigned long flags; 454 int err = 0; 455 456 spin_lock_irqsave(&pcistub_devices_lock, flags); 457 458 while (!list_empty(&seized_devices)) { 459 psdev = container_of(seized_devices.next, 460 struct pcistub_device, dev_list); 461 list_del(&psdev->dev_list); 462 463 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 464 465 err = pcistub_init_device(psdev->dev); 466 if (err) { 467 dev_err(&psdev->dev->dev, 468 "error %d initializing device\n", err); 469 kfree(psdev); 470 psdev = NULL; 471 } 472 473 spin_lock_irqsave(&pcistub_devices_lock, flags); 474 475 if (psdev) 476 list_add_tail(&psdev->dev_list, &pcistub_devices); 477 } 478 479 initialize_devices = 1; 480 481 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 482 483 return 0; 484 } 485 486 static void pcistub_device_id_add_list(struct pcistub_device_id *new, 487 int domain, int bus, unsigned int devfn) 488 { 489 struct pcistub_device_id *pci_dev_id; 490 unsigned long flags; 491 int found = 0; 492 493 spin_lock_irqsave(&device_ids_lock, flags); 494 495 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { 496 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus && 497 pci_dev_id->devfn == devfn) { 498 found = 1; 499 break; 500 } 501 } 502 503 if (!found) { 504 new->domain = domain; 505 new->bus = bus; 506 new->devfn = devfn; 507 list_add_tail(&new->slot_list, &pcistub_device_ids); 508 } 509 510 spin_unlock_irqrestore(&device_ids_lock, flags); 511 512 if (found) 513 kfree(new); 514 } 515 516 static int pcistub_seize(struct pci_dev *dev, 517 struct pcistub_device_id *pci_dev_id) 518 { 519 struct pcistub_device *psdev; 520 unsigned long flags; 521 int err = 0; 522 523 psdev = pcistub_device_alloc(dev); 524 if (!psdev) { 525 kfree(pci_dev_id); 526 return -ENOMEM; 527 } 528 529 spin_lock_irqsave(&pcistub_devices_lock, flags); 530 531 if (initialize_devices) { 532 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 533 534 /* don't want irqs disabled when calling pcistub_init_device */ 535 err = pcistub_init_device(psdev->dev); 536 537 spin_lock_irqsave(&pcistub_devices_lock, flags); 538 539 if (!err) 540 list_add(&psdev->dev_list, &pcistub_devices); 541 } else { 542 dev_dbg(&dev->dev, "deferring initialization\n"); 543 list_add(&psdev->dev_list, &seized_devices); 544 } 545 546 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 547 548 if (err) { 549 kfree(pci_dev_id); 550 pcistub_device_put(psdev); 551 } else if (pci_dev_id) 552 pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus), 553 dev->bus->number, dev->devfn); 554 555 return err; 556 } 557 558 /* Called when 'bind'. This means we must _NOT_ call pci_reset_function or 559 * other functions that take the sysfs lock. */ 560 static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) 561 { 562 int err = 0, match; 563 struct pcistub_device_id *pci_dev_id = NULL; 564 565 dev_dbg(&dev->dev, "probing...\n"); 566 567 match = pcistub_match(dev); 568 569 if ((dev->driver_override && 570 !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) || 571 match) { 572 573 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL 574 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 575 dev_err(&dev->dev, "can't export pci devices that " 576 "don't have a normal (0) or bridge (1) " 577 "header type!\n"); 578 err = -ENODEV; 579 goto out; 580 } 581 582 if (!match) { 583 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); 584 if (!pci_dev_id) { 585 err = -ENOMEM; 586 goto out; 587 } 588 } 589 590 dev_info(&dev->dev, "seizing device\n"); 591 err = pcistub_seize(dev, pci_dev_id); 592 } else 593 /* Didn't find the device */ 594 err = -ENODEV; 595 596 out: 597 return err; 598 } 599 600 /* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or 601 * other functions that take the sysfs lock. */ 602 static void pcistub_remove(struct pci_dev *dev) 603 { 604 struct pcistub_device *psdev, *found_psdev = NULL; 605 unsigned long flags; 606 607 dev_dbg(&dev->dev, "removing\n"); 608 609 spin_lock_irqsave(&pcistub_devices_lock, flags); 610 611 xen_pcibk_config_quirk_release(dev); 612 613 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 614 if (psdev->dev == dev) { 615 found_psdev = psdev; 616 break; 617 } 618 } 619 620 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 621 622 if (found_psdev) { 623 dev_dbg(&dev->dev, "found device to remove %s\n", 624 found_psdev->pdev ? "- in-use" : ""); 625 626 if (found_psdev->pdev) { 627 int domid = xen_find_device_domain_owner(dev); 628 629 pr_warn("****** removing device %s while still in-use by domain %d! ******\n", 630 pci_name(found_psdev->dev), domid); 631 pr_warn("****** driver domain may still access this device's i/o resources!\n"); 632 pr_warn("****** shutdown driver domain before binding device\n"); 633 pr_warn("****** to other drivers or domains\n"); 634 635 /* N.B. This ends up calling pcistub_put_pci_dev which ends up 636 * doing the FLR. */ 637 xen_pcibk_release_pci_dev(found_psdev->pdev, 638 found_psdev->dev, 639 false /* caller holds the lock. */); 640 } 641 642 spin_lock_irqsave(&pcistub_devices_lock, flags); 643 list_del(&found_psdev->dev_list); 644 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 645 646 /* the final put for releasing from the list */ 647 pcistub_device_put(found_psdev); 648 } 649 } 650 651 static const struct pci_device_id pcistub_ids[] = { 652 { 653 .vendor = PCI_ANY_ID, 654 .device = PCI_ANY_ID, 655 .subvendor = PCI_ANY_ID, 656 .subdevice = PCI_ANY_ID, 657 }, 658 {0,}, 659 }; 660 661 #define PCI_NODENAME_MAX 40 662 static void kill_domain_by_device(struct pcistub_device *psdev) 663 { 664 struct xenbus_transaction xbt; 665 int err; 666 char nodename[PCI_NODENAME_MAX]; 667 668 BUG_ON(!psdev); 669 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", 670 psdev->pdev->xdev->otherend_id); 671 672 again: 673 err = xenbus_transaction_start(&xbt); 674 if (err) { 675 dev_err(&psdev->dev->dev, 676 "error %d when start xenbus transaction\n", err); 677 return; 678 } 679 /*PV AER handlers will set this flag*/ 680 xenbus_printf(xbt, nodename, "aerState" , "aerfail"); 681 err = xenbus_transaction_end(xbt, 0); 682 if (err) { 683 if (err == -EAGAIN) 684 goto again; 685 dev_err(&psdev->dev->dev, 686 "error %d when end xenbus transaction\n", err); 687 return; 688 } 689 } 690 691 /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and 692 * backend need to have cooperation. In xen_pcibk, those steps will do similar 693 * jobs: send service request and waiting for front_end response. 694 */ 695 static pci_ers_result_t common_process(struct pcistub_device *psdev, 696 pci_channel_state_t state, int aer_cmd, 697 pci_ers_result_t result) 698 { 699 pci_ers_result_t res = result; 700 struct xen_pcie_aer_op *aer_op; 701 struct xen_pcibk_device *pdev = psdev->pdev; 702 struct xen_pci_sharedinfo *sh_info = pdev->sh_info; 703 int ret; 704 705 /*with PV AER drivers*/ 706 aer_op = &(sh_info->aer_op); 707 aer_op->cmd = aer_cmd ; 708 /*useful for error_detected callback*/ 709 aer_op->err = state; 710 /*pcifront_end BDF*/ 711 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, 712 &aer_op->domain, &aer_op->bus, &aer_op->devfn); 713 if (!ret) { 714 dev_err(&psdev->dev->dev, 715 DRV_NAME ": failed to get pcifront device\n"); 716 return PCI_ERS_RESULT_NONE; 717 } 718 wmb(); 719 720 dev_dbg(&psdev->dev->dev, 721 DRV_NAME ": aer_op %x dom %x bus %x devfn %x\n", 722 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); 723 /*local flag to mark there's aer request, xen_pcibk callback will use 724 * this flag to judge whether we need to check pci-front give aer 725 * service ack signal 726 */ 727 set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 728 729 /*It is possible that a pcifront conf_read_write ops request invokes 730 * the callback which cause the spurious execution of wake_up. 731 * Yet it is harmless and better than a spinlock here 732 */ 733 set_bit(_XEN_PCIB_active, 734 (unsigned long *)&sh_info->flags); 735 wmb(); 736 notify_remote_via_irq(pdev->evtchn_irq); 737 738 ret = wait_event_timeout(xen_pcibk_aer_wait_queue, 739 !(test_bit(_XEN_PCIB_active, (unsigned long *) 740 &sh_info->flags)), 300*HZ); 741 742 if (!ret) { 743 if (test_bit(_XEN_PCIB_active, 744 (unsigned long *)&sh_info->flags)) { 745 dev_err(&psdev->dev->dev, 746 "pcifront aer process not responding!\n"); 747 clear_bit(_XEN_PCIB_active, 748 (unsigned long *)&sh_info->flags); 749 aer_op->err = PCI_ERS_RESULT_NONE; 750 return res; 751 } 752 } 753 clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 754 755 if (test_bit(_XEN_PCIF_active, 756 (unsigned long *)&sh_info->flags)) { 757 dev_dbg(&psdev->dev->dev, 758 "schedule pci_conf service in " DRV_NAME "\n"); 759 xen_pcibk_test_and_schedule_op(psdev->pdev); 760 } 761 762 res = (pci_ers_result_t)aer_op->err; 763 return res; 764 } 765 766 /* 767 * xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case 768 * of the device driver could provide this service, and then wait for pcifront 769 * ack. 770 * @dev: pointer to PCI devices 771 * return value is used by aer_core do_recovery policy 772 */ 773 static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) 774 { 775 struct pcistub_device *psdev; 776 pci_ers_result_t result; 777 778 result = PCI_ERS_RESULT_RECOVERED; 779 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", 780 dev->bus->number, dev->devfn); 781 782 down_write(&pcistub_sem); 783 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 784 dev->bus->number, 785 PCI_SLOT(dev->devfn), 786 PCI_FUNC(dev->devfn)); 787 788 if (!psdev || !psdev->pdev) { 789 dev_err(&dev->dev, 790 DRV_NAME " device is not found/assigned\n"); 791 goto end; 792 } 793 794 if (!psdev->pdev->sh_info) { 795 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 796 " by HVM, kill it\n"); 797 kill_domain_by_device(psdev); 798 goto end; 799 } 800 801 if (!test_bit(_XEN_PCIB_AERHANDLER, 802 (unsigned long *)&psdev->pdev->sh_info->flags)) { 803 dev_err(&dev->dev, 804 "guest with no AER driver should have been killed\n"); 805 goto end; 806 } 807 result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); 808 809 if (result == PCI_ERS_RESULT_NONE || 810 result == PCI_ERS_RESULT_DISCONNECT) { 811 dev_dbg(&dev->dev, 812 "No AER slot_reset service or disconnected!\n"); 813 kill_domain_by_device(psdev); 814 } 815 end: 816 if (psdev) 817 pcistub_device_put(psdev); 818 up_write(&pcistub_sem); 819 return result; 820 821 } 822 823 824 /*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront 825 * in case of the device driver could provide this service, and then wait 826 * for pcifront ack 827 * @dev: pointer to PCI devices 828 * return value is used by aer_core do_recovery policy 829 */ 830 831 static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) 832 { 833 struct pcistub_device *psdev; 834 pci_ers_result_t result; 835 836 result = PCI_ERS_RESULT_RECOVERED; 837 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", 838 dev->bus->number, dev->devfn); 839 840 down_write(&pcistub_sem); 841 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 842 dev->bus->number, 843 PCI_SLOT(dev->devfn), 844 PCI_FUNC(dev->devfn)); 845 846 if (!psdev || !psdev->pdev) { 847 dev_err(&dev->dev, 848 DRV_NAME " device is not found/assigned\n"); 849 goto end; 850 } 851 852 if (!psdev->pdev->sh_info) { 853 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 854 " by HVM, kill it\n"); 855 kill_domain_by_device(psdev); 856 goto end; 857 } 858 859 if (!test_bit(_XEN_PCIB_AERHANDLER, 860 (unsigned long *)&psdev->pdev->sh_info->flags)) { 861 dev_err(&dev->dev, 862 "guest with no AER driver should have been killed\n"); 863 goto end; 864 } 865 result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); 866 867 if (result == PCI_ERS_RESULT_NONE || 868 result == PCI_ERS_RESULT_DISCONNECT) { 869 dev_dbg(&dev->dev, 870 "No AER mmio_enabled service or disconnected!\n"); 871 kill_domain_by_device(psdev); 872 } 873 end: 874 if (psdev) 875 pcistub_device_put(psdev); 876 up_write(&pcistub_sem); 877 return result; 878 } 879 880 /*xen_pcibk_error_detected: it will send the error_detected request to pcifront 881 * in case of the device driver could provide this service, and then wait 882 * for pcifront ack. 883 * @dev: pointer to PCI devices 884 * @error: the current PCI connection state 885 * return value is used by aer_core do_recovery policy 886 */ 887 888 static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, 889 pci_channel_state_t error) 890 { 891 struct pcistub_device *psdev; 892 pci_ers_result_t result; 893 894 result = PCI_ERS_RESULT_CAN_RECOVER; 895 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", 896 dev->bus->number, dev->devfn); 897 898 down_write(&pcistub_sem); 899 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 900 dev->bus->number, 901 PCI_SLOT(dev->devfn), 902 PCI_FUNC(dev->devfn)); 903 904 if (!psdev || !psdev->pdev) { 905 dev_err(&dev->dev, 906 DRV_NAME " device is not found/assigned\n"); 907 goto end; 908 } 909 910 if (!psdev->pdev->sh_info) { 911 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 912 " by HVM, kill it\n"); 913 kill_domain_by_device(psdev); 914 goto end; 915 } 916 917 /*Guest owns the device yet no aer handler regiested, kill guest*/ 918 if (!test_bit(_XEN_PCIB_AERHANDLER, 919 (unsigned long *)&psdev->pdev->sh_info->flags)) { 920 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); 921 kill_domain_by_device(psdev); 922 goto end; 923 } 924 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); 925 926 if (result == PCI_ERS_RESULT_NONE || 927 result == PCI_ERS_RESULT_DISCONNECT) { 928 dev_dbg(&dev->dev, 929 "No AER error_detected service or disconnected!\n"); 930 kill_domain_by_device(psdev); 931 } 932 end: 933 if (psdev) 934 pcistub_device_put(psdev); 935 up_write(&pcistub_sem); 936 return result; 937 } 938 939 /*xen_pcibk_error_resume: it will send the error_resume request to pcifront 940 * in case of the device driver could provide this service, and then wait 941 * for pcifront ack. 942 * @dev: pointer to PCI devices 943 */ 944 945 static void xen_pcibk_error_resume(struct pci_dev *dev) 946 { 947 struct pcistub_device *psdev; 948 949 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", 950 dev->bus->number, dev->devfn); 951 952 down_write(&pcistub_sem); 953 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 954 dev->bus->number, 955 PCI_SLOT(dev->devfn), 956 PCI_FUNC(dev->devfn)); 957 958 if (!psdev || !psdev->pdev) { 959 dev_err(&dev->dev, 960 DRV_NAME " device is not found/assigned\n"); 961 goto end; 962 } 963 964 if (!psdev->pdev->sh_info) { 965 dev_err(&dev->dev, DRV_NAME " device is not connected or owned" 966 " by HVM, kill it\n"); 967 kill_domain_by_device(psdev); 968 goto end; 969 } 970 971 if (!test_bit(_XEN_PCIB_AERHANDLER, 972 (unsigned long *)&psdev->pdev->sh_info->flags)) { 973 dev_err(&dev->dev, 974 "guest with no AER driver should have been killed\n"); 975 kill_domain_by_device(psdev); 976 goto end; 977 } 978 common_process(psdev, 1, XEN_PCI_OP_aer_resume, 979 PCI_ERS_RESULT_RECOVERED); 980 end: 981 if (psdev) 982 pcistub_device_put(psdev); 983 up_write(&pcistub_sem); 984 return; 985 } 986 987 /*add xen_pcibk AER handling*/ 988 static const struct pci_error_handlers xen_pcibk_error_handler = { 989 .error_detected = xen_pcibk_error_detected, 990 .mmio_enabled = xen_pcibk_mmio_enabled, 991 .slot_reset = xen_pcibk_slot_reset, 992 .resume = xen_pcibk_error_resume, 993 }; 994 995 /* 996 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't 997 * for a normal device. I don't want it to be loaded automatically. 998 */ 999 1000 static struct pci_driver xen_pcibk_pci_driver = { 1001 /* The name should be xen_pciback, but until the tools are updated 1002 * we will keep it as pciback. */ 1003 .name = PCISTUB_DRIVER_NAME, 1004 .id_table = pcistub_ids, 1005 .probe = pcistub_probe, 1006 .remove = pcistub_remove, 1007 .err_handler = &xen_pcibk_error_handler, 1008 }; 1009 1010 static inline int str_to_slot(const char *buf, int *domain, int *bus, 1011 int *slot, int *func) 1012 { 1013 int parsed = 0; 1014 1015 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, 1016 &parsed)) { 1017 case 3: 1018 *func = -1; 1019 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); 1020 break; 1021 case 2: 1022 *slot = *func = -1; 1023 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); 1024 break; 1025 } 1026 if (parsed && !buf[parsed]) 1027 return 0; 1028 1029 /* try again without domain */ 1030 *domain = 0; 1031 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { 1032 case 2: 1033 *func = -1; 1034 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); 1035 break; 1036 case 1: 1037 *slot = *func = -1; 1038 sscanf(buf, " %x:*.* %n", bus, &parsed); 1039 break; 1040 } 1041 if (parsed && !buf[parsed]) 1042 return 0; 1043 1044 return -EINVAL; 1045 } 1046 1047 static inline int str_to_quirk(const char *buf, int *domain, int *bus, int 1048 *slot, int *func, int *reg, int *size, int *mask) 1049 { 1050 int parsed = 0; 1051 1052 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, 1053 reg, size, mask, &parsed); 1054 if (parsed && !buf[parsed]) 1055 return 0; 1056 1057 /* try again without domain */ 1058 *domain = 0; 1059 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, 1060 mask, &parsed); 1061 if (parsed && !buf[parsed]) 1062 return 0; 1063 1064 return -EINVAL; 1065 } 1066 1067 static int pcistub_device_id_add(int domain, int bus, int slot, int func) 1068 { 1069 struct pcistub_device_id *pci_dev_id; 1070 int rc = 0, devfn = PCI_DEVFN(slot, func); 1071 1072 if (slot < 0) { 1073 for (slot = 0; !rc && slot < 32; ++slot) 1074 rc = pcistub_device_id_add(domain, bus, slot, func); 1075 return rc; 1076 } 1077 1078 if (func < 0) { 1079 for (func = 0; !rc && func < 8; ++func) 1080 rc = pcistub_device_id_add(domain, bus, slot, func); 1081 return rc; 1082 } 1083 1084 if (( 1085 #if !defined(MODULE) /* pci_domains_supported is not being exported */ \ 1086 || !defined(CONFIG_PCI_DOMAINS) 1087 !pci_domains_supported ? domain : 1088 #endif 1089 domain < 0 || domain > 0xffff) 1090 || bus < 0 || bus > 0xff 1091 || PCI_SLOT(devfn) != slot 1092 || PCI_FUNC(devfn) != func) 1093 return -EINVAL; 1094 1095 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); 1096 if (!pci_dev_id) 1097 return -ENOMEM; 1098 1099 pr_debug("wants to seize %04x:%02x:%02x.%d\n", 1100 domain, bus, slot, func); 1101 1102 pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn); 1103 1104 return 0; 1105 } 1106 1107 static int pcistub_device_id_remove(int domain, int bus, int slot, int func) 1108 { 1109 struct pcistub_device_id *pci_dev_id, *t; 1110 int err = -ENOENT; 1111 unsigned long flags; 1112 1113 spin_lock_irqsave(&device_ids_lock, flags); 1114 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, 1115 slot_list) { 1116 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus 1117 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) 1118 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { 1119 /* Don't break; here because it's possible the same 1120 * slot could be in the list more than once 1121 */ 1122 list_del(&pci_dev_id->slot_list); 1123 kfree(pci_dev_id); 1124 1125 err = 0; 1126 1127 pr_debug("removed %04x:%02x:%02x.%d from seize list\n", 1128 domain, bus, slot, func); 1129 } 1130 } 1131 spin_unlock_irqrestore(&device_ids_lock, flags); 1132 1133 return err; 1134 } 1135 1136 static int pcistub_reg_add(int domain, int bus, int slot, int func, 1137 unsigned int reg, unsigned int size, 1138 unsigned int mask) 1139 { 1140 int err = 0; 1141 struct pcistub_device *psdev; 1142 struct pci_dev *dev; 1143 struct config_field *field; 1144 1145 if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) 1146 return -EINVAL; 1147 1148 psdev = pcistub_device_find(domain, bus, slot, func); 1149 if (!psdev) { 1150 err = -ENODEV; 1151 goto out; 1152 } 1153 dev = psdev->dev; 1154 1155 field = kzalloc(sizeof(*field), GFP_KERNEL); 1156 if (!field) { 1157 err = -ENOMEM; 1158 goto out; 1159 } 1160 1161 field->offset = reg; 1162 field->size = size; 1163 field->mask = mask; 1164 field->init = NULL; 1165 field->reset = NULL; 1166 field->release = NULL; 1167 field->clean = xen_pcibk_config_field_free; 1168 1169 err = xen_pcibk_config_quirks_add_field(dev, field); 1170 if (err) 1171 kfree(field); 1172 out: 1173 if (psdev) 1174 pcistub_device_put(psdev); 1175 return err; 1176 } 1177 1178 static ssize_t new_slot_store(struct device_driver *drv, const char *buf, 1179 size_t count) 1180 { 1181 int domain, bus, slot, func; 1182 int err; 1183 1184 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1185 if (err) 1186 goto out; 1187 1188 err = pcistub_device_id_add(domain, bus, slot, func); 1189 1190 out: 1191 if (!err) 1192 err = count; 1193 return err; 1194 } 1195 static DRIVER_ATTR_WO(new_slot); 1196 1197 static ssize_t remove_slot_store(struct device_driver *drv, const char *buf, 1198 size_t count) 1199 { 1200 int domain, bus, slot, func; 1201 int err; 1202 1203 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1204 if (err) 1205 goto out; 1206 1207 err = pcistub_device_id_remove(domain, bus, slot, func); 1208 1209 out: 1210 if (!err) 1211 err = count; 1212 return err; 1213 } 1214 static DRIVER_ATTR_WO(remove_slot); 1215 1216 static ssize_t slots_show(struct device_driver *drv, char *buf) 1217 { 1218 struct pcistub_device_id *pci_dev_id; 1219 size_t count = 0; 1220 unsigned long flags; 1221 1222 spin_lock_irqsave(&device_ids_lock, flags); 1223 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { 1224 if (count >= PAGE_SIZE) 1225 break; 1226 1227 count += scnprintf(buf + count, PAGE_SIZE - count, 1228 "%04x:%02x:%02x.%d\n", 1229 pci_dev_id->domain, pci_dev_id->bus, 1230 PCI_SLOT(pci_dev_id->devfn), 1231 PCI_FUNC(pci_dev_id->devfn)); 1232 } 1233 spin_unlock_irqrestore(&device_ids_lock, flags); 1234 1235 return count; 1236 } 1237 static DRIVER_ATTR_RO(slots); 1238 1239 static ssize_t irq_handlers_show(struct device_driver *drv, char *buf) 1240 { 1241 struct pcistub_device *psdev; 1242 struct xen_pcibk_dev_data *dev_data; 1243 size_t count = 0; 1244 unsigned long flags; 1245 1246 spin_lock_irqsave(&pcistub_devices_lock, flags); 1247 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1248 if (count >= PAGE_SIZE) 1249 break; 1250 if (!psdev->dev) 1251 continue; 1252 dev_data = pci_get_drvdata(psdev->dev); 1253 if (!dev_data) 1254 continue; 1255 count += 1256 scnprintf(buf + count, PAGE_SIZE - count, 1257 "%s:%s:%sing:%ld\n", 1258 pci_name(psdev->dev), 1259 dev_data->isr_on ? "on" : "off", 1260 dev_data->ack_intr ? "ack" : "not ack", 1261 dev_data->handled); 1262 } 1263 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1264 return count; 1265 } 1266 static DRIVER_ATTR_RO(irq_handlers); 1267 1268 static ssize_t irq_handler_state_store(struct device_driver *drv, 1269 const char *buf, size_t count) 1270 { 1271 struct pcistub_device *psdev; 1272 struct xen_pcibk_dev_data *dev_data; 1273 int domain, bus, slot, func; 1274 int err; 1275 1276 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1277 if (err) 1278 return err; 1279 1280 psdev = pcistub_device_find(domain, bus, slot, func); 1281 if (!psdev) { 1282 err = -ENOENT; 1283 goto out; 1284 } 1285 1286 dev_data = pci_get_drvdata(psdev->dev); 1287 if (!dev_data) { 1288 err = -ENOENT; 1289 goto out; 1290 } 1291 1292 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", 1293 dev_data->irq_name, dev_data->isr_on, 1294 !dev_data->isr_on); 1295 1296 dev_data->isr_on = !(dev_data->isr_on); 1297 if (dev_data->isr_on) 1298 dev_data->ack_intr = 1; 1299 out: 1300 if (psdev) 1301 pcistub_device_put(psdev); 1302 if (!err) 1303 err = count; 1304 return err; 1305 } 1306 static DRIVER_ATTR_WO(irq_handler_state); 1307 1308 static ssize_t quirks_store(struct device_driver *drv, const char *buf, 1309 size_t count) 1310 { 1311 int domain, bus, slot, func, reg, size, mask; 1312 int err; 1313 1314 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, 1315 &mask); 1316 if (err) 1317 goto out; 1318 1319 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); 1320 1321 out: 1322 if (!err) 1323 err = count; 1324 return err; 1325 } 1326 1327 static ssize_t quirks_show(struct device_driver *drv, char *buf) 1328 { 1329 int count = 0; 1330 unsigned long flags; 1331 struct xen_pcibk_config_quirk *quirk; 1332 struct xen_pcibk_dev_data *dev_data; 1333 const struct config_field *field; 1334 const struct config_field_entry *cfg_entry; 1335 1336 spin_lock_irqsave(&device_ids_lock, flags); 1337 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { 1338 if (count >= PAGE_SIZE) 1339 goto out; 1340 1341 count += scnprintf(buf + count, PAGE_SIZE - count, 1342 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", 1343 quirk->pdev->bus->number, 1344 PCI_SLOT(quirk->pdev->devfn), 1345 PCI_FUNC(quirk->pdev->devfn), 1346 quirk->devid.vendor, quirk->devid.device, 1347 quirk->devid.subvendor, 1348 quirk->devid.subdevice); 1349 1350 dev_data = pci_get_drvdata(quirk->pdev); 1351 1352 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { 1353 field = cfg_entry->field; 1354 if (count >= PAGE_SIZE) 1355 goto out; 1356 1357 count += scnprintf(buf + count, PAGE_SIZE - count, 1358 "\t\t%08x:%01x:%08x\n", 1359 cfg_entry->base_offset + 1360 field->offset, field->size, 1361 field->mask); 1362 } 1363 } 1364 1365 out: 1366 spin_unlock_irqrestore(&device_ids_lock, flags); 1367 1368 return count; 1369 } 1370 static DRIVER_ATTR_RW(quirks); 1371 1372 static ssize_t permissive_store(struct device_driver *drv, const char *buf, 1373 size_t count) 1374 { 1375 int domain, bus, slot, func; 1376 int err; 1377 struct pcistub_device *psdev; 1378 struct xen_pcibk_dev_data *dev_data; 1379 1380 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1381 if (err) 1382 goto out; 1383 1384 psdev = pcistub_device_find(domain, bus, slot, func); 1385 if (!psdev) { 1386 err = -ENODEV; 1387 goto out; 1388 } 1389 1390 dev_data = pci_get_drvdata(psdev->dev); 1391 /* the driver data for a device should never be null at this point */ 1392 if (!dev_data) { 1393 err = -ENXIO; 1394 goto release; 1395 } 1396 if (!dev_data->permissive) { 1397 dev_data->permissive = 1; 1398 /* Let user know that what they're doing could be unsafe */ 1399 dev_warn(&psdev->dev->dev, "enabling permissive mode " 1400 "configuration space accesses!\n"); 1401 dev_warn(&psdev->dev->dev, 1402 "permissive mode is potentially unsafe!\n"); 1403 } 1404 release: 1405 pcistub_device_put(psdev); 1406 out: 1407 if (!err) 1408 err = count; 1409 return err; 1410 } 1411 1412 static ssize_t permissive_show(struct device_driver *drv, char *buf) 1413 { 1414 struct pcistub_device *psdev; 1415 struct xen_pcibk_dev_data *dev_data; 1416 size_t count = 0; 1417 unsigned long flags; 1418 spin_lock_irqsave(&pcistub_devices_lock, flags); 1419 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1420 if (count >= PAGE_SIZE) 1421 break; 1422 if (!psdev->dev) 1423 continue; 1424 dev_data = pci_get_drvdata(psdev->dev); 1425 if (!dev_data || !dev_data->permissive) 1426 continue; 1427 count += 1428 scnprintf(buf + count, PAGE_SIZE - count, "%s\n", 1429 pci_name(psdev->dev)); 1430 } 1431 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1432 return count; 1433 } 1434 static DRIVER_ATTR_RW(permissive); 1435 1436 static ssize_t allow_interrupt_control_store(struct device_driver *drv, 1437 const char *buf, size_t count) 1438 { 1439 int domain, bus, slot, func; 1440 int err; 1441 struct pcistub_device *psdev; 1442 struct xen_pcibk_dev_data *dev_data; 1443 1444 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1445 if (err) 1446 goto out; 1447 1448 psdev = pcistub_device_find(domain, bus, slot, func); 1449 if (!psdev) { 1450 err = -ENODEV; 1451 goto out; 1452 } 1453 1454 dev_data = pci_get_drvdata(psdev->dev); 1455 /* the driver data for a device should never be null at this point */ 1456 if (!dev_data) { 1457 err = -ENXIO; 1458 goto release; 1459 } 1460 dev_data->allow_interrupt_control = 1; 1461 release: 1462 pcistub_device_put(psdev); 1463 out: 1464 if (!err) 1465 err = count; 1466 return err; 1467 } 1468 1469 static ssize_t allow_interrupt_control_show(struct device_driver *drv, 1470 char *buf) 1471 { 1472 struct pcistub_device *psdev; 1473 struct xen_pcibk_dev_data *dev_data; 1474 size_t count = 0; 1475 unsigned long flags; 1476 1477 spin_lock_irqsave(&pcistub_devices_lock, flags); 1478 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1479 if (count >= PAGE_SIZE) 1480 break; 1481 if (!psdev->dev) 1482 continue; 1483 dev_data = pci_get_drvdata(psdev->dev); 1484 if (!dev_data || !dev_data->allow_interrupt_control) 1485 continue; 1486 count += 1487 scnprintf(buf + count, PAGE_SIZE - count, "%s\n", 1488 pci_name(psdev->dev)); 1489 } 1490 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1491 return count; 1492 } 1493 static DRIVER_ATTR_RW(allow_interrupt_control); 1494 1495 static void pcistub_exit(void) 1496 { 1497 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); 1498 driver_remove_file(&xen_pcibk_pci_driver.driver, 1499 &driver_attr_remove_slot); 1500 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); 1501 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); 1502 driver_remove_file(&xen_pcibk_pci_driver.driver, 1503 &driver_attr_permissive); 1504 driver_remove_file(&xen_pcibk_pci_driver.driver, 1505 &driver_attr_allow_interrupt_control); 1506 driver_remove_file(&xen_pcibk_pci_driver.driver, 1507 &driver_attr_irq_handlers); 1508 driver_remove_file(&xen_pcibk_pci_driver.driver, 1509 &driver_attr_irq_handler_state); 1510 pci_unregister_driver(&xen_pcibk_pci_driver); 1511 } 1512 1513 static int __init pcistub_init(void) 1514 { 1515 int pos = 0; 1516 int err = 0; 1517 int domain, bus, slot, func; 1518 int parsed; 1519 1520 if (pci_devs_to_hide && *pci_devs_to_hide) { 1521 do { 1522 parsed = 0; 1523 1524 err = sscanf(pci_devs_to_hide + pos, 1525 " (%x:%x:%x.%x) %n", 1526 &domain, &bus, &slot, &func, &parsed); 1527 switch (err) { 1528 case 3: 1529 func = -1; 1530 sscanf(pci_devs_to_hide + pos, 1531 " (%x:%x:%x.*) %n", 1532 &domain, &bus, &slot, &parsed); 1533 break; 1534 case 2: 1535 slot = func = -1; 1536 sscanf(pci_devs_to_hide + pos, 1537 " (%x:%x:*.*) %n", 1538 &domain, &bus, &parsed); 1539 break; 1540 } 1541 1542 if (!parsed) { 1543 domain = 0; 1544 err = sscanf(pci_devs_to_hide + pos, 1545 " (%x:%x.%x) %n", 1546 &bus, &slot, &func, &parsed); 1547 switch (err) { 1548 case 2: 1549 func = -1; 1550 sscanf(pci_devs_to_hide + pos, 1551 " (%x:%x.*) %n", 1552 &bus, &slot, &parsed); 1553 break; 1554 case 1: 1555 slot = func = -1; 1556 sscanf(pci_devs_to_hide + pos, 1557 " (%x:*.*) %n", 1558 &bus, &parsed); 1559 break; 1560 } 1561 } 1562 1563 if (parsed <= 0) 1564 goto parse_error; 1565 1566 err = pcistub_device_id_add(domain, bus, slot, func); 1567 if (err) 1568 goto out; 1569 1570 pos += parsed; 1571 } while (pci_devs_to_hide[pos]); 1572 } 1573 1574 /* If we're the first PCI Device Driver to register, we're the 1575 * first one to get offered PCI devices as they become 1576 * available (and thus we can be the first to grab them) 1577 */ 1578 err = pci_register_driver(&xen_pcibk_pci_driver); 1579 if (err < 0) 1580 goto out; 1581 1582 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1583 &driver_attr_new_slot); 1584 if (!err) 1585 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1586 &driver_attr_remove_slot); 1587 if (!err) 1588 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1589 &driver_attr_slots); 1590 if (!err) 1591 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1592 &driver_attr_quirks); 1593 if (!err) 1594 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1595 &driver_attr_permissive); 1596 if (!err) 1597 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1598 &driver_attr_allow_interrupt_control); 1599 1600 if (!err) 1601 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1602 &driver_attr_irq_handlers); 1603 if (!err) 1604 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1605 &driver_attr_irq_handler_state); 1606 if (err) 1607 pcistub_exit(); 1608 1609 out: 1610 return err; 1611 1612 parse_error: 1613 pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", 1614 pci_devs_to_hide + pos); 1615 return -EINVAL; 1616 } 1617 1618 #ifndef MODULE 1619 /* 1620 * fs_initcall happens before device_initcall 1621 * so xen_pcibk *should* get called first (b/c we 1622 * want to suck up any device before other drivers 1623 * get a chance by being the first pci device 1624 * driver to register) 1625 */ 1626 fs_initcall(pcistub_init); 1627 #endif 1628 1629 #ifdef CONFIG_PCI_IOV 1630 static struct pcistub_device *find_vfs(const struct pci_dev *pdev) 1631 { 1632 struct pcistub_device *psdev = NULL; 1633 unsigned long flags; 1634 bool found = false; 1635 1636 spin_lock_irqsave(&pcistub_devices_lock, flags); 1637 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1638 if (!psdev->pdev && psdev->dev != pdev 1639 && pci_physfn(psdev->dev) == pdev) { 1640 found = true; 1641 break; 1642 } 1643 } 1644 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1645 if (found) 1646 return psdev; 1647 return NULL; 1648 } 1649 1650 static int pci_stub_notifier(struct notifier_block *nb, 1651 unsigned long action, void *data) 1652 { 1653 struct device *dev = data; 1654 const struct pci_dev *pdev = to_pci_dev(dev); 1655 1656 if (action != BUS_NOTIFY_UNBIND_DRIVER) 1657 return NOTIFY_DONE; 1658 1659 if (!pdev->is_physfn) 1660 return NOTIFY_DONE; 1661 1662 for (;;) { 1663 struct pcistub_device *psdev = find_vfs(pdev); 1664 if (!psdev) 1665 break; 1666 device_release_driver(&psdev->dev->dev); 1667 } 1668 return NOTIFY_DONE; 1669 } 1670 1671 static struct notifier_block pci_stub_nb = { 1672 .notifier_call = pci_stub_notifier, 1673 }; 1674 #endif 1675 1676 static int __init xen_pcibk_init(void) 1677 { 1678 int err; 1679 1680 if (!xen_initial_domain()) 1681 return -ENODEV; 1682 1683 err = xen_pcibk_config_init(); 1684 if (err) 1685 return err; 1686 1687 #ifdef MODULE 1688 err = pcistub_init(); 1689 if (err < 0) 1690 return err; 1691 #endif 1692 1693 pcistub_init_devices_late(); 1694 err = xen_pcibk_xenbus_register(); 1695 if (err) 1696 pcistub_exit(); 1697 #ifdef CONFIG_PCI_IOV 1698 else 1699 bus_register_notifier(&pci_bus_type, &pci_stub_nb); 1700 #endif 1701 1702 return err; 1703 } 1704 1705 static void __exit xen_pcibk_cleanup(void) 1706 { 1707 #ifdef CONFIG_PCI_IOV 1708 bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); 1709 #endif 1710 xen_pcibk_xenbus_unregister(); 1711 pcistub_exit(); 1712 } 1713 1714 module_init(xen_pcibk_init); 1715 module_exit(xen_pcibk_cleanup); 1716 1717 MODULE_LICENSE("Dual BSD/GPL"); 1718 MODULE_ALIAS("xen-backend:pci"); 1719