FILE
pci_stub.c
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linux-6.19.14/drivers/xen/xen-pciback/pci_stub.c
1/* 2 * PCI Stub Driver - Grabs devices in backend to be exported later 3 * 4 * Ryan Wilson <hap9@epoch.ncsc.mil> 5 * Chris Bookholt <hap10@epoch.ncsc.mil> 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9#define dev_fmt pr_fmt 10 11#include <linux/module.h> 12#include <linux/init.h> 13#include <linux/rwsem.h> 14#include <linux/list.h> 15#include <linux/spinlock.h> 16#include <linux/kref.h> 17#include <linux/pci.h> 18#include <linux/wait.h> 19#include <linux/sched.h> 20#include <linux/atomic.h> 21#include <xen/events.h> 22#include <xen/pci.h> 23#include <xen/xen.h> 24#ifdef CONFIG_XEN_ACPI 25#include <xen/acpi.h> 26#endif 27#include <asm/xen/hypervisor.h> 28#include <xen/interface/physdev.h> 29#include "pciback.h" 30#include "conf_space.h" 31#include "conf_space_quirks.h" 32 33#define PCISTUB_DRIVER_NAME "pciback" 34 35static char *pci_devs_to_hide; 36wait_queue_head_t xen_pcibk_aer_wait_queue; 37/*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops, 38* We want to avoid in middle of AER ops, xen_pcibk devices is being removed 39*/ 40static DECLARE_RWSEM(pcistub_sem); 41module_param_named(hide, pci_devs_to_hide, charp, 0444); 42 43struct pcistub_device_id { 44 struct list_head slot_list; 45 int domain; 46 unsigned char bus; 47 unsigned int devfn; 48}; 49static LIST_HEAD(pcistub_device_ids); 50static DEFINE_SPINLOCK(device_ids_lock); 51 52struct pcistub_device { 53 struct kref kref; 54 struct list_head dev_list; 55 spinlock_t lock; 56 57 struct pci_dev *dev; 58 struct xen_pcibk_device *pdev;/* non-NULL if struct pci_dev is in use */ 59#ifdef CONFIG_XEN_ACPI 60 int gsi; 61#endif 62}; 63 64/* Access to pcistub_devices & seized_devices lists and the initialize_devices 65 * flag must be locked with pcistub_devices_lock 66 */ 67static DEFINE_SPINLOCK(pcistub_devices_lock); 68static LIST_HEAD(pcistub_devices); 69 70/* wait for device_initcall before initializing our devices 71 * (see pcistub_init_devices_late) 72 */ 73static int initialize_devices; 74static LIST_HEAD(seized_devices); 75 76static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) 77{ 78 struct pcistub_device *psdev; 79 80 dev_dbg(&dev->dev, "pcistub_device_alloc\n"); 81 82 psdev = kzalloc(sizeof(*psdev), GFP_KERNEL); 83 if (!psdev) 84 return NULL; 85 86 psdev->dev = pci_dev_get(dev); 87 if (!psdev->dev) { 88 kfree(psdev); 89 return NULL; 90 } 91 92 kref_init(&psdev->kref); 93 spin_lock_init(&psdev->lock); 94#ifdef CONFIG_XEN_ACPI 95 psdev->gsi = -1; 96#endif 97 98 return psdev; 99} 100 101static int pcistub_reset_device_state(struct pci_dev *dev) 102{ 103 __pci_reset_function_locked(dev); 104 105 if (!xen_pv_domain()) 106 return xen_reset_device(dev); 107 else 108 return 0; 109} 110 111/* Don't call this directly as it's called by pcistub_device_put */ 112static void pcistub_device_release(struct kref *kref) 113{ 114 struct pcistub_device *psdev; 115 struct pci_dev *dev; 116 struct xen_pcibk_dev_data *dev_data; 117 118 psdev = container_of(kref, struct pcistub_device, kref); 119 dev = psdev->dev; 120 dev_data = pci_get_drvdata(dev); 121 122 dev_dbg(&dev->dev, "pcistub_device_release\n"); 123 124 xen_unregister_device_domain_owner(dev); 125 126 /* Call the reset function which does not take lock as this 127 * is called from "unbind" which takes a device_lock mutex. 128 */ 129 pcistub_reset_device_state(dev); 130 if (dev_data && 131 pci_load_and_free_saved_state(dev, &dev_data->pci_saved_state)) 132 dev_info(&dev->dev, "Could not reload PCI state\n"); 133 else 134 pci_restore_state(dev); 135 136 if (dev->msix_cap) { 137 struct physdev_pci_device ppdev = { 138 .seg = pci_domain_nr(dev->bus), 139 .bus = dev->bus->number, 140 .devfn = dev->devfn 141 }; 142 int err = HYPERVISOR_physdev_op(PHYSDEVOP_release_msix, 143 &ppdev); 144 145 if (err && err != -ENOSYS) 146 dev_warn(&dev->dev, "MSI-X release failed (%d)\n", 147 err); 148 } 149 150 /* Disable the device */ 151 xen_pcibk_reset_device(dev); 152 153 kfree(dev_data); 154 pci_set_drvdata(dev, NULL); 155 156 /* Clean-up the device */ 157 xen_pcibk_config_free_dyn_fields(dev); 158 xen_pcibk_config_free_dev(dev); 159 160 pci_clear_dev_assigned(dev); 161 pci_dev_put(dev); 162 163 kfree(psdev); 164} 165 166static inline void pcistub_device_get(struct pcistub_device *psdev) 167{ 168 kref_get(&psdev->kref); 169} 170 171static inline void pcistub_device_put(struct pcistub_device *psdev) 172{ 173 kref_put(&psdev->kref, pcistub_device_release); 174} 175 176static struct pcistub_device *pcistub_device_find_locked(int domain, int bus, 177 int slot, int func) 178{ 179 struct pcistub_device *psdev; 180 181 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 182 if (psdev->dev != NULL 183 && domain == pci_domain_nr(psdev->dev->bus) 184 && bus == psdev->dev->bus->number 185 && slot == PCI_SLOT(psdev->dev->devfn) 186 && func == PCI_FUNC(psdev->dev->devfn)) { 187 return psdev; 188 } 189 } 190 191 return NULL; 192} 193 194static struct pcistub_device *pcistub_device_find(int domain, int bus, 195 int slot, int func) 196{ 197 struct pcistub_device *psdev; 198 unsigned long flags; 199 200 spin_lock_irqsave(&pcistub_devices_lock, flags); 201 202 psdev = pcistub_device_find_locked(domain, bus, slot, func); 203 if (psdev) 204 pcistub_device_get(psdev); 205 206 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 207 return psdev; 208} 209 210static struct pci_dev *pcistub_device_get_pci_dev(struct xen_pcibk_device *pdev, 211 struct pcistub_device *psdev) 212{ 213 struct pci_dev *pci_dev = NULL; 214 unsigned long flags; 215 216 spin_lock_irqsave(&psdev->lock, flags); 217 if (!psdev->pdev) { 218 psdev->pdev = pdev; 219 pci_dev = psdev->dev; 220 } 221 spin_unlock_irqrestore(&psdev->lock, flags); 222 223 if (pci_dev) 224 pcistub_device_get(psdev); 225 226 return pci_dev; 227} 228 229#ifdef CONFIG_XEN_ACPI 230static int pcistub_get_gsi_from_sbdf(unsigned int sbdf) 231{ 232 struct pcistub_device *psdev; 233 int domain = (sbdf >> 16) & 0xffff; 234 int bus = PCI_BUS_NUM(sbdf); 235 int slot = PCI_SLOT(sbdf); 236 int func = PCI_FUNC(sbdf); 237 238 psdev = pcistub_device_find(domain, bus, slot, func); 239 240 if (!psdev) 241 return -ENODEV; 242 243 return psdev->gsi; 244} 245#endif 246 247struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev, 248 int domain, int bus, 249 int slot, int func) 250{ 251 struct pcistub_device *psdev; 252 struct pci_dev *found_dev = NULL; 253 unsigned long flags; 254 255 spin_lock_irqsave(&pcistub_devices_lock, flags); 256 257 psdev = pcistub_device_find_locked(domain, bus, slot, func); 258 if (psdev) 259 found_dev = pcistub_device_get_pci_dev(pdev, psdev); 260 261 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 262 return found_dev; 263} 264 265/* 266 * Called when: 267 * - XenBus state has been reconfigure (pci unplug). See xen_pcibk_remove_device 268 * - XenBus state has been disconnected (guest shutdown). See xen_pcibk_xenbus_remove 269 * - 'echo BDF > unbind' on pciback module with no guest attached. See pcistub_remove 270 * - 'echo BDF > unbind' with a guest still using it. See pcistub_remove 271 * 272 * As such we have to be careful. 273 * 274 * To make this easier, the caller has to hold the device lock. 275 */ 276void pcistub_put_pci_dev(struct pci_dev *dev) 277{ 278 struct pcistub_device *psdev, *found_psdev = NULL; 279 unsigned long flags; 280 struct xen_pcibk_dev_data *dev_data; 281 int ret; 282 283 spin_lock_irqsave(&pcistub_devices_lock, flags); 284 285 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 286 if (psdev->dev == dev) { 287 found_psdev = psdev; 288 break; 289 } 290 } 291 292 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 293 if (WARN_ON(!found_psdev)) 294 return; 295 296 /*hold this lock for avoiding breaking link between 297 * pcistub and xen_pcibk when AER is in processing 298 */ 299 down_write(&pcistub_sem); 300 /* Cleanup our device 301 * (so it's ready for the next domain) 302 */ 303 device_lock_assert(&dev->dev); 304 pcistub_reset_device_state(dev); 305 306 dev_data = pci_get_drvdata(dev); 307 ret = pci_load_saved_state(dev, dev_data->pci_saved_state); 308 if (!ret) { 309 /* 310 * The usual sequence is pci_save_state & pci_restore_state 311 * but the guest might have messed the configuration space up. 312 * Use the initial version (when device was bound to us). 313 */ 314 pci_restore_state(dev); 315 } else 316 dev_info(&dev->dev, "Could not reload PCI state\n"); 317 /* This disables the device. */ 318 xen_pcibk_reset_device(dev); 319 320 /* And cleanup up our emulated fields. */ 321 xen_pcibk_config_reset_dev(dev); 322 xen_pcibk_config_free_dyn_fields(dev); 323 324 dev_data->allow_interrupt_control = 0; 325 326 xen_unregister_device_domain_owner(dev); 327 328 spin_lock_irqsave(&found_psdev->lock, flags); 329 found_psdev->pdev = NULL; 330 spin_unlock_irqrestore(&found_psdev->lock, flags); 331 332 pcistub_device_put(found_psdev); 333 up_write(&pcistub_sem); 334} 335 336static int pcistub_match_one(struct pci_dev *dev, 337 struct pcistub_device_id *pdev_id) 338{ 339 /* Match the specified device by domain, bus, slot, func and also if 340 * any of the device's parent bridges match. 341 */ 342 for (; dev != NULL; dev = dev->bus->self) { 343 if (pci_domain_nr(dev->bus) == pdev_id->domain 344 && dev->bus->number == pdev_id->bus 345 && dev->devfn == pdev_id->devfn) 346 return 1; 347 348 /* Sometimes topmost bridge links to itself. */ 349 if (dev == dev->bus->self) 350 break; 351 } 352 353 return 0; 354} 355 356static int pcistub_match(struct pci_dev *dev) 357{ 358 struct pcistub_device_id *pdev_id; 359 unsigned long flags; 360 int found = 0; 361 362 spin_lock_irqsave(&device_ids_lock, flags); 363 list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { 364 if (pcistub_match_one(dev, pdev_id)) { 365 found = 1; 366 break; 367 } 368 } 369 spin_unlock_irqrestore(&device_ids_lock, flags); 370 371 return found; 372} 373 374static int pcistub_init_device(struct pcistub_device *psdev) 375{ 376 struct xen_pcibk_dev_data *dev_data; 377 struct pci_dev *dev; 378#ifdef CONFIG_XEN_ACPI 379 int gsi, trigger, polarity; 380#endif 381 int err = 0; 382 383 if (!psdev) 384 return -EINVAL; 385 386 dev = psdev->dev; 387 388 dev_dbg(&dev->dev, "initializing...\n"); 389 390 /* The PCI backend is not intended to be a module (or to work with 391 * removable PCI devices (yet). If it were, xen_pcibk_config_free() 392 * would need to be called somewhere to free the memory allocated 393 * here and then to call kfree(pci_get_drvdata(psdev->dev)). 394 */ 395 dev_data = kzalloc(sizeof(*dev_data) + strlen(DRV_NAME "[]") 396 + strlen(pci_name(dev)) + 1, GFP_KERNEL); 397 if (!dev_data) { 398 err = -ENOMEM; 399 goto out; 400 } 401 pci_set_drvdata(dev, dev_data); 402 403 /* 404 * Setup name for fake IRQ handler. It will only be enabled 405 * once the device is turned on by the guest. 406 */ 407 sprintf(dev_data->irq_name, DRV_NAME "[%s]", pci_name(dev)); 408 409 dev_dbg(&dev->dev, "initializing config\n"); 410 411 init_waitqueue_head(&xen_pcibk_aer_wait_queue); 412 err = xen_pcibk_config_init_dev(dev); 413 if (err) 414 goto out; 415 416 /* HACK: Force device (& ACPI) to determine what IRQ it's on - we 417 * must do this here because pcibios_enable_device may specify 418 * the pci device's true irq (and possibly its other resources) 419 * if they differ from what's in the configuration space. 420 * This makes the assumption that the device's resources won't 421 * change after this point (otherwise this code may break!) 422 */ 423 dev_dbg(&dev->dev, "enabling device\n"); 424 err = pci_enable_device(dev); 425 if (err) 426 goto config_release; 427 428 if (dev->msix_cap) { 429 struct physdev_pci_device ppdev = { 430 .seg = pci_domain_nr(dev->bus), 431 .bus = dev->bus->number, 432 .devfn = dev->devfn 433 }; 434 435 err = HYPERVISOR_physdev_op(PHYSDEVOP_prepare_msix, &ppdev); 436 if (err && err != -ENOSYS) 437 dev_err(&dev->dev, "MSI-X preparation failed (%d)\n", 438 err); 439 } 440 441 /* We need the device active to save the state. */ 442 dev_dbg(&dev->dev, "save state of device\n"); 443 pci_save_state(dev); 444 dev_data->pci_saved_state = pci_store_saved_state(dev); 445 if (!dev_data->pci_saved_state) 446 dev_err(&dev->dev, "Could not store PCI conf saved state!\n"); 447 else { 448 dev_dbg(&dev->dev, "resetting (FLR, D3, etc) the device\n"); 449 err = pcistub_reset_device_state(dev); 450 if (err) 451 goto config_release; 452 pci_restore_state(dev); 453 } 454 455#ifdef CONFIG_XEN_ACPI 456 if (xen_initial_domain() && xen_pvh_domain()) { 457 err = xen_acpi_get_gsi_info(dev, &gsi, &trigger, &polarity); 458 if (err) { 459 dev_err(&dev->dev, "Fail to get gsi info!\n"); 460 goto config_release; 461 } 462 err = xen_pvh_setup_gsi(gsi, trigger, polarity); 463 if (err) 464 goto config_release; 465 psdev->gsi = gsi; 466 } 467#endif 468 469 /* Now disable the device (this also ensures some private device 470 * data is setup before we export) 471 */ 472 dev_dbg(&dev->dev, "reset device\n"); 473 xen_pcibk_reset_device(dev); 474 475 pci_set_dev_assigned(dev); 476 return 0; 477 478config_release: 479 xen_pcibk_config_free_dev(dev); 480 481out: 482 pci_set_drvdata(dev, NULL); 483 kfree(dev_data); 484 return err; 485} 486 487/* 488 * Because some initialization still happens on 489 * devices during fs_initcall, we need to defer 490 * full initialization of our devices until 491 * device_initcall. 492 */ 493static int __init pcistub_init_devices_late(void) 494{ 495 struct pcistub_device *psdev; 496 unsigned long flags; 497 int err = 0; 498 499 spin_lock_irqsave(&pcistub_devices_lock, flags); 500 501 while (!list_empty(&seized_devices)) { 502 psdev = container_of(seized_devices.next, 503 struct pcistub_device, dev_list); 504 list_del(&psdev->dev_list); 505 506 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 507 508 err = pcistub_init_device(psdev); 509 if (err) { 510 dev_err(&psdev->dev->dev, 511 "error %d initializing device\n", err); 512 kfree(psdev); 513 psdev = NULL; 514 } 515 516 spin_lock_irqsave(&pcistub_devices_lock, flags); 517 518 if (psdev) 519 list_add_tail(&psdev->dev_list, &pcistub_devices); 520 } 521 522 initialize_devices = 1; 523 524 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 525 526 return 0; 527} 528 529static void pcistub_device_id_add_list(struct pcistub_device_id *new, 530 int domain, int bus, unsigned int devfn) 531{ 532 struct pcistub_device_id *pci_dev_id; 533 unsigned long flags; 534 int found = 0; 535 536 spin_lock_irqsave(&device_ids_lock, flags); 537 538 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { 539 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus && 540 pci_dev_id->devfn == devfn) { 541 found = 1; 542 break; 543 } 544 } 545 546 if (!found) { 547 new->domain = domain; 548 new->bus = bus; 549 new->devfn = devfn; 550 list_add_tail(&new->slot_list, &pcistub_device_ids); 551 } 552 553 spin_unlock_irqrestore(&device_ids_lock, flags); 554 555 if (found) 556 kfree(new); 557} 558 559static int pcistub_seize(struct pci_dev *dev, 560 struct pcistub_device_id *pci_dev_id) 561{ 562 struct pcistub_device *psdev; 563 unsigned long flags; 564 int err = 0; 565 566 psdev = pcistub_device_alloc(dev); 567 if (!psdev) { 568 kfree(pci_dev_id); 569 return -ENOMEM; 570 } 571 572 spin_lock_irqsave(&pcistub_devices_lock, flags); 573 574 if (initialize_devices) { 575 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 576 577 /* don't want irqs disabled when calling pcistub_init_device */ 578 err = pcistub_init_device(psdev); 579 580 spin_lock_irqsave(&pcistub_devices_lock, flags); 581 582 if (!err) 583 list_add(&psdev->dev_list, &pcistub_devices); 584 } else { 585 dev_dbg(&dev->dev, "deferring initialization\n"); 586 list_add(&psdev->dev_list, &seized_devices); 587 } 588 589 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 590 591 if (err) { 592 kfree(pci_dev_id); 593 pcistub_device_put(psdev); 594 } else if (pci_dev_id) 595 pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus), 596 dev->bus->number, dev->devfn); 597 598 return err; 599} 600 601/* Called when 'bind'. This means we must _NOT_ call pci_reset_function or 602 * other functions that take the sysfs lock. */ 603static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id) 604{ 605 int err = 0, match; 606 struct pcistub_device_id *pci_dev_id = NULL; 607 608 dev_dbg(&dev->dev, "probing...\n"); 609 610 match = pcistub_match(dev); 611 612 if ((dev->driver_override && 613 !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) || 614 match) { 615 616 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL 617 && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { 618 dev_err(&dev->dev, "can't export pci devices that " 619 "don't have a normal (0) or bridge (1) " 620 "header type!\n"); 621 err = -ENODEV; 622 goto out; 623 } 624 625 if (!match) { 626 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); 627 if (!pci_dev_id) { 628 err = -ENOMEM; 629 goto out; 630 } 631 } 632 633 dev_info(&dev->dev, "seizing device\n"); 634 err = pcistub_seize(dev, pci_dev_id); 635 } else 636 /* Didn't find the device */ 637 err = -ENODEV; 638 639out: 640 return err; 641} 642 643/* Called when 'unbind'. This means we must _NOT_ call pci_reset_function or 644 * other functions that take the sysfs lock. */ 645static void pcistub_remove(struct pci_dev *dev) 646{ 647 struct pcistub_device *psdev, *found_psdev = NULL; 648 unsigned long flags; 649 650 dev_dbg(&dev->dev, "removing\n"); 651 652 spin_lock_irqsave(&pcistub_devices_lock, flags); 653 654 xen_pcibk_config_quirk_release(dev); 655 656 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 657 if (psdev->dev == dev) { 658 found_psdev = psdev; 659 break; 660 } 661 } 662 663 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 664 665 if (found_psdev) { 666 dev_dbg(&dev->dev, "found device to remove %s\n", 667 found_psdev->pdev ? "- in-use" : ""); 668 669 if (found_psdev->pdev) { 670 int domid = xen_find_device_domain_owner(dev); 671 672 dev_warn(&dev->dev, "****** removing device %s while still in-use by domain %d! ******\n", 673 pci_name(found_psdev->dev), domid); 674 dev_warn(&dev->dev, "****** driver domain may still access this device's i/o resources!\n"); 675 dev_warn(&dev->dev, "****** shutdown driver domain before binding device\n"); 676 dev_warn(&dev->dev, "****** to other drivers or domains\n"); 677 678 /* N.B. This ends up calling pcistub_put_pci_dev which ends up 679 * doing the FLR. */ 680 xen_pcibk_release_pci_dev(found_psdev->pdev, 681 found_psdev->dev, 682 false /* caller holds the lock. */); 683 } 684 685 spin_lock_irqsave(&pcistub_devices_lock, flags); 686 list_del(&found_psdev->dev_list); 687 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 688 689 /* the final put for releasing from the list */ 690 pcistub_device_put(found_psdev); 691 } 692} 693 694static const struct pci_device_id pcistub_ids[] = { 695 { 696 .vendor = PCI_ANY_ID, 697 .device = PCI_ANY_ID, 698 .subvendor = PCI_ANY_ID, 699 .subdevice = PCI_ANY_ID, 700 }, 701 {0,}, 702}; 703 704#define PCI_NODENAME_MAX 40 705static void kill_domain_by_device(struct pcistub_device *psdev) 706{ 707 struct xenbus_transaction xbt; 708 int err; 709 char nodename[PCI_NODENAME_MAX]; 710 711 BUG_ON(!psdev); 712 snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", 713 psdev->pdev->xdev->otherend_id); 714 715again: 716 err = xenbus_transaction_start(&xbt); 717 if (err) { 718 dev_err(&psdev->dev->dev, 719 "error %d when start xenbus transaction\n", err); 720 return; 721 } 722 /*PV AER handlers will set this flag*/ 723 xenbus_printf(xbt, nodename, "aerState" , "aerfail"); 724 err = xenbus_transaction_end(xbt, 0); 725 if (err) { 726 if (err == -EAGAIN) 727 goto again; 728 dev_err(&psdev->dev->dev, 729 "error %d when end xenbus transaction\n", err); 730 return; 731 } 732} 733 734/* For each aer recovery step error_detected, mmio_enabled, etc, front_end and 735 * backend need to have cooperation. In xen_pcibk, those steps will do similar 736 * jobs: send service request and waiting for front_end response. 737*/ 738static pci_ers_result_t common_process(struct pcistub_device *psdev, 739 pci_channel_state_t state, int aer_cmd, 740 pci_ers_result_t result) 741{ 742 pci_ers_result_t res = result; 743 struct xen_pcie_aer_op *aer_op; 744 struct xen_pcibk_device *pdev = psdev->pdev; 745 struct xen_pci_sharedinfo *sh_info = pdev->sh_info; 746 int ret; 747 748 /*with PV AER drivers*/ 749 aer_op = &(sh_info->aer_op); 750 aer_op->cmd = aer_cmd ; 751 /*useful for error_detected callback*/ 752 aer_op->err = state; 753 /*pcifront_end BDF*/ 754 ret = xen_pcibk_get_pcifront_dev(psdev->dev, psdev->pdev, 755 &aer_op->domain, &aer_op->bus, &aer_op->devfn); 756 if (!ret) { 757 dev_err(&psdev->dev->dev, "failed to get pcifront device\n"); 758 return PCI_ERS_RESULT_NONE; 759 } 760 wmb(); 761 762 dev_dbg(&psdev->dev->dev, "aer_op %x dom %x bus %x devfn %x\n", 763 aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); 764 /*local flag to mark there's aer request, xen_pcibk callback will use 765 * this flag to judge whether we need to check pci-front give aer 766 * service ack signal 767 */ 768 set_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 769 770 /*It is possible that a pcifront conf_read_write ops request invokes 771 * the callback which cause the spurious execution of wake_up. 772 * Yet it is harmless and better than a spinlock here 773 */ 774 set_bit(_XEN_PCIB_active, 775 (unsigned long *)&sh_info->flags); 776 wmb(); 777 notify_remote_via_irq(pdev->evtchn_irq); 778 779 /* Enable IRQ to signal "request done". */ 780 xen_pcibk_lateeoi(pdev, 0); 781 782 ret = wait_event_timeout(xen_pcibk_aer_wait_queue, 783 !(test_bit(_XEN_PCIB_active, (unsigned long *) 784 &sh_info->flags)), 300*HZ); 785 786 /* Enable IRQ for pcifront request if not already active. */ 787 if (!test_bit(_PDEVF_op_active, &pdev->flags)) 788 xen_pcibk_lateeoi(pdev, 0); 789 790 if (!ret) { 791 if (test_bit(_XEN_PCIB_active, 792 (unsigned long *)&sh_info->flags)) { 793 dev_err(&psdev->dev->dev, 794 "pcifront aer process not responding!\n"); 795 clear_bit(_XEN_PCIB_active, 796 (unsigned long *)&sh_info->flags); 797 aer_op->err = PCI_ERS_RESULT_NONE; 798 return res; 799 } 800 } 801 clear_bit(_PCIB_op_pending, (unsigned long *)&pdev->flags); 802 803 res = (__force pci_ers_result_t)aer_op->err; 804 return res; 805} 806 807/* 808* xen_pcibk_slot_reset: it will send the slot_reset request to pcifront in case 809* of the device driver could provide this service, and then wait for pcifront 810* ack. 811* @dev: pointer to PCI devices 812* return value is used by aer_core do_recovery policy 813*/ 814static pci_ers_result_t xen_pcibk_slot_reset(struct pci_dev *dev) 815{ 816 struct pcistub_device *psdev; 817 pci_ers_result_t result; 818 819 result = PCI_ERS_RESULT_RECOVERED; 820 dev_dbg(&dev->dev, "xen_pcibk_slot_reset(bus:%x,devfn:%x)\n", 821 dev->bus->number, dev->devfn); 822 823 down_write(&pcistub_sem); 824 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 825 dev->bus->number, 826 PCI_SLOT(dev->devfn), 827 PCI_FUNC(dev->devfn)); 828 829 if (!psdev || !psdev->pdev) { 830 dev_err(&dev->dev, "device is not found/assigned\n"); 831 goto end; 832 } 833 834 if (!psdev->pdev->sh_info) { 835 dev_err(&dev->dev, "device is not connected or owned" 836 " by HVM, kill it\n"); 837 kill_domain_by_device(psdev); 838 goto end; 839 } 840 841 if (!test_bit(_XEN_PCIB_AERHANDLER, 842 (unsigned long *)&psdev->pdev->sh_info->flags)) { 843 dev_err(&dev->dev, 844 "guest with no AER driver should have been killed\n"); 845 goto end; 846 } 847 result = common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_slotreset, result); 848 849 if (result == PCI_ERS_RESULT_NONE || 850 result == PCI_ERS_RESULT_DISCONNECT) { 851 dev_dbg(&dev->dev, 852 "No AER slot_reset service or disconnected!\n"); 853 kill_domain_by_device(psdev); 854 } 855end: 856 if (psdev) 857 pcistub_device_put(psdev); 858 up_write(&pcistub_sem); 859 return result; 860 861} 862 863 864/*xen_pcibk_mmio_enabled: it will send the mmio_enabled request to pcifront 865* in case of the device driver could provide this service, and then wait 866* for pcifront ack 867* @dev: pointer to PCI devices 868* return value is used by aer_core do_recovery policy 869*/ 870 871static pci_ers_result_t xen_pcibk_mmio_enabled(struct pci_dev *dev) 872{ 873 struct pcistub_device *psdev; 874 pci_ers_result_t result; 875 876 result = PCI_ERS_RESULT_RECOVERED; 877 dev_dbg(&dev->dev, "xen_pcibk_mmio_enabled(bus:%x,devfn:%x)\n", 878 dev->bus->number, dev->devfn); 879 880 down_write(&pcistub_sem); 881 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 882 dev->bus->number, 883 PCI_SLOT(dev->devfn), 884 PCI_FUNC(dev->devfn)); 885 886 if (!psdev || !psdev->pdev) { 887 dev_err(&dev->dev, "device is not found/assigned\n"); 888 goto end; 889 } 890 891 if (!psdev->pdev->sh_info) { 892 dev_err(&dev->dev, "device is not connected or owned" 893 " by HVM, kill it\n"); 894 kill_domain_by_device(psdev); 895 goto end; 896 } 897 898 if (!test_bit(_XEN_PCIB_AERHANDLER, 899 (unsigned long *)&psdev->pdev->sh_info->flags)) { 900 dev_err(&dev->dev, 901 "guest with no AER driver should have been killed\n"); 902 goto end; 903 } 904 result = common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_mmio, result); 905 906 if (result == PCI_ERS_RESULT_NONE || 907 result == PCI_ERS_RESULT_DISCONNECT) { 908 dev_dbg(&dev->dev, 909 "No AER mmio_enabled service or disconnected!\n"); 910 kill_domain_by_device(psdev); 911 } 912end: 913 if (psdev) 914 pcistub_device_put(psdev); 915 up_write(&pcistub_sem); 916 return result; 917} 918 919/*xen_pcibk_error_detected: it will send the error_detected request to pcifront 920* in case of the device driver could provide this service, and then wait 921* for pcifront ack. 922* @dev: pointer to PCI devices 923* @error: the current PCI connection state 924* return value is used by aer_core do_recovery policy 925*/ 926 927static pci_ers_result_t xen_pcibk_error_detected(struct pci_dev *dev, 928 pci_channel_state_t error) 929{ 930 struct pcistub_device *psdev; 931 pci_ers_result_t result; 932 933 result = PCI_ERS_RESULT_CAN_RECOVER; 934 dev_dbg(&dev->dev, "xen_pcibk_error_detected(bus:%x,devfn:%x)\n", 935 dev->bus->number, dev->devfn); 936 937 down_write(&pcistub_sem); 938 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 939 dev->bus->number, 940 PCI_SLOT(dev->devfn), 941 PCI_FUNC(dev->devfn)); 942 943 if (!psdev || !psdev->pdev) { 944 dev_err(&dev->dev, "device is not found/assigned\n"); 945 goto end; 946 } 947 948 if (!psdev->pdev->sh_info) { 949 dev_err(&dev->dev, "device is not connected or owned" 950 " by HVM, kill it\n"); 951 kill_domain_by_device(psdev); 952 goto end; 953 } 954 955 /*Guest owns the device yet no aer handler regiested, kill guest*/ 956 if (!test_bit(_XEN_PCIB_AERHANDLER, 957 (unsigned long *)&psdev->pdev->sh_info->flags)) { 958 dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); 959 kill_domain_by_device(psdev); 960 goto end; 961 } 962 result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); 963 964 if (result == PCI_ERS_RESULT_NONE || 965 result == PCI_ERS_RESULT_DISCONNECT) { 966 dev_dbg(&dev->dev, 967 "No AER error_detected service or disconnected!\n"); 968 kill_domain_by_device(psdev); 969 } 970end: 971 if (psdev) 972 pcistub_device_put(psdev); 973 up_write(&pcistub_sem); 974 return result; 975} 976 977/*xen_pcibk_error_resume: it will send the error_resume request to pcifront 978* in case of the device driver could provide this service, and then wait 979* for pcifront ack. 980* @dev: pointer to PCI devices 981*/ 982 983static void xen_pcibk_error_resume(struct pci_dev *dev) 984{ 985 struct pcistub_device *psdev; 986 987 dev_dbg(&dev->dev, "xen_pcibk_error_resume(bus:%x,devfn:%x)\n", 988 dev->bus->number, dev->devfn); 989 990 down_write(&pcistub_sem); 991 psdev = pcistub_device_find(pci_domain_nr(dev->bus), 992 dev->bus->number, 993 PCI_SLOT(dev->devfn), 994 PCI_FUNC(dev->devfn)); 995 996 if (!psdev || !psdev->pdev) { 997 dev_err(&dev->dev, "device is not found/assigned\n"); 998 goto end; 999 } 1000 1001 if (!psdev->pdev->sh_info) { 1002 dev_err(&dev->dev, "device is not connected or owned" 1003 " by HVM, kill it\n"); 1004 kill_domain_by_device(psdev); 1005 goto end; 1006 } 1007 1008 if (!test_bit(_XEN_PCIB_AERHANDLER, 1009 (unsigned long *)&psdev->pdev->sh_info->flags)) { 1010 dev_err(&dev->dev, 1011 "guest with no AER driver should have been killed\n"); 1012 kill_domain_by_device(psdev); 1013 goto end; 1014 } 1015 common_process(psdev, pci_channel_io_normal, XEN_PCI_OP_aer_resume, 1016 PCI_ERS_RESULT_RECOVERED); 1017end: 1018 if (psdev) 1019 pcistub_device_put(psdev); 1020 up_write(&pcistub_sem); 1021 return; 1022} 1023 1024/*add xen_pcibk AER handling*/ 1025static const struct pci_error_handlers xen_pcibk_error_handler = { 1026 .error_detected = xen_pcibk_error_detected, 1027 .mmio_enabled = xen_pcibk_mmio_enabled, 1028 .slot_reset = xen_pcibk_slot_reset, 1029 .resume = xen_pcibk_error_resume, 1030}; 1031 1032/* 1033 * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't 1034 * for a normal device. I don't want it to be loaded automatically. 1035 */ 1036 1037static struct pci_driver xen_pcibk_pci_driver = { 1038 /* The name should be xen_pciback, but until the tools are updated 1039 * we will keep it as pciback. */ 1040 .name = PCISTUB_DRIVER_NAME, 1041 .id_table = pcistub_ids, 1042 .probe = pcistub_probe, 1043 .remove = pcistub_remove, 1044 .err_handler = &xen_pcibk_error_handler, 1045}; 1046 1047static inline int str_to_slot(const char *buf, int *domain, int *bus, 1048 int *slot, int *func) 1049{ 1050 int parsed = 0; 1051 1052 switch (sscanf(buf, " %x:%x:%x.%x %n", domain, bus, slot, func, 1053 &parsed)) { 1054 case 3: 1055 *func = -1; 1056 sscanf(buf, " %x:%x:%x.* %n", domain, bus, slot, &parsed); 1057 break; 1058 case 2: 1059 *slot = *func = -1; 1060 sscanf(buf, " %x:%x:*.* %n", domain, bus, &parsed); 1061 break; 1062 } 1063 if (parsed && !buf[parsed]) 1064 return 0; 1065 1066 /* try again without domain */ 1067 *domain = 0; 1068 switch (sscanf(buf, " %x:%x.%x %n", bus, slot, func, &parsed)) { 1069 case 2: 1070 *func = -1; 1071 sscanf(buf, " %x:%x.* %n", bus, slot, &parsed); 1072 break; 1073 case 1: 1074 *slot = *func = -1; 1075 sscanf(buf, " %x:*.* %n", bus, &parsed); 1076 break; 1077 } 1078 if (parsed && !buf[parsed]) 1079 return 0; 1080 1081 return -EINVAL; 1082} 1083 1084static inline int str_to_quirk(const char *buf, int *domain, int *bus, int 1085 *slot, int *func, int *reg, int *size, int *mask) 1086{ 1087 int parsed = 0; 1088 1089 sscanf(buf, " %x:%x:%x.%x-%x:%x:%x %n", domain, bus, slot, func, 1090 reg, size, mask, &parsed); 1091 if (parsed && !buf[parsed]) 1092 return 0; 1093 1094 /* try again without domain */ 1095 *domain = 0; 1096 sscanf(buf, " %x:%x.%x-%x:%x:%x %n", bus, slot, func, reg, size, 1097 mask, &parsed); 1098 if (parsed && !buf[parsed]) 1099 return 0; 1100 1101 return -EINVAL; 1102} 1103 1104static int pcistub_device_id_add(int domain, int bus, int slot, int func) 1105{ 1106 struct pcistub_device_id *pci_dev_id; 1107 int rc = 0, devfn = PCI_DEVFN(slot, func); 1108 1109 if (slot < 0) { 1110 for (slot = 0; !rc && slot < 32; ++slot) 1111 rc = pcistub_device_id_add(domain, bus, slot, func); 1112 return rc; 1113 } 1114 1115 if (func < 0) { 1116 for (func = 0; !rc && func < 8; ++func) 1117 rc = pcistub_device_id_add(domain, bus, slot, func); 1118 return rc; 1119 } 1120 1121 if (( 1122#if !defined(MODULE) /* pci_domains_supported is not being exported */ \ 1123 || !defined(CONFIG_PCI_DOMAINS) 1124 !pci_domains_supported ? domain : 1125#endif 1126 domain < 0 || domain > 0xffff) 1127 || bus < 0 || bus > 0xff 1128 || PCI_SLOT(devfn) != slot 1129 || PCI_FUNC(devfn) != func) 1130 return -EINVAL; 1131 1132 pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); 1133 if (!pci_dev_id) 1134 return -ENOMEM; 1135 1136 pr_debug("wants to seize %04x:%02x:%02x.%d\n", 1137 domain, bus, slot, func); 1138 1139 pcistub_device_id_add_list(pci_dev_id, domain, bus, devfn); 1140 1141 return 0; 1142} 1143 1144static int pcistub_device_id_remove(int domain, int bus, int slot, int func) 1145{ 1146 struct pcistub_device_id *pci_dev_id, *t; 1147 int err = -ENOENT; 1148 unsigned long flags; 1149 1150 spin_lock_irqsave(&device_ids_lock, flags); 1151 list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, 1152 slot_list) { 1153 if (pci_dev_id->domain == domain && pci_dev_id->bus == bus 1154 && (slot < 0 || PCI_SLOT(pci_dev_id->devfn) == slot) 1155 && (func < 0 || PCI_FUNC(pci_dev_id->devfn) == func)) { 1156 /* Don't break; here because it's possible the same 1157 * slot could be in the list more than once 1158 */ 1159 list_del(&pci_dev_id->slot_list); 1160 kfree(pci_dev_id); 1161 1162 err = 0; 1163 1164 pr_debug("removed %04x:%02x:%02x.%d from seize list\n", 1165 domain, bus, slot, func); 1166 } 1167 } 1168 spin_unlock_irqrestore(&device_ids_lock, flags); 1169 1170 return err; 1171} 1172 1173static int pcistub_reg_add(int domain, int bus, int slot, int func, 1174 unsigned int reg, unsigned int size, 1175 unsigned int mask) 1176{ 1177 int err = 0; 1178 struct pcistub_device *psdev; 1179 struct pci_dev *dev; 1180 struct config_field *field; 1181 1182 if (reg > 0xfff || (size < 4 && (mask >> (size * 8)))) 1183 return -EINVAL; 1184 1185 psdev = pcistub_device_find(domain, bus, slot, func); 1186 if (!psdev) { 1187 err = -ENODEV; 1188 goto out; 1189 } 1190 dev = psdev->dev; 1191 1192 field = kzalloc(sizeof(*field), GFP_KERNEL); 1193 if (!field) { 1194 err = -ENOMEM; 1195 goto out; 1196 } 1197 1198 field->offset = reg; 1199 field->size = size; 1200 field->mask = mask; 1201 field->init = NULL; 1202 field->reset = NULL; 1203 field->release = NULL; 1204 field->clean = xen_pcibk_config_field_free; 1205 1206 err = xen_pcibk_config_quirks_add_field(dev, field); 1207 if (err) 1208 kfree(field); 1209out: 1210 if (psdev) 1211 pcistub_device_put(psdev); 1212 return err; 1213} 1214 1215static ssize_t new_slot_store(struct device_driver *drv, const char *buf, 1216 size_t count) 1217{ 1218 int domain, bus, slot, func; 1219 int err; 1220 1221 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1222 if (err) 1223 goto out; 1224 1225 err = pcistub_device_id_add(domain, bus, slot, func); 1226 1227out: 1228 if (!err) 1229 err = count; 1230 return err; 1231} 1232static DRIVER_ATTR_WO(new_slot); 1233 1234static ssize_t remove_slot_store(struct device_driver *drv, const char *buf, 1235 size_t count) 1236{ 1237 int domain, bus, slot, func; 1238 int err; 1239 1240 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1241 if (err) 1242 goto out; 1243 1244 err = pcistub_device_id_remove(domain, bus, slot, func); 1245 1246out: 1247 if (!err) 1248 err = count; 1249 return err; 1250} 1251static DRIVER_ATTR_WO(remove_slot); 1252 1253static ssize_t slots_show(struct device_driver *drv, char *buf) 1254{ 1255 struct pcistub_device_id *pci_dev_id; 1256 size_t count = 0; 1257 unsigned long flags; 1258 1259 spin_lock_irqsave(&device_ids_lock, flags); 1260 list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { 1261 if (count >= PAGE_SIZE) 1262 break; 1263 1264 count += sysfs_emit_at(buf, count, 1265 "%04x:%02x:%02x.%d\n", 1266 pci_dev_id->domain, pci_dev_id->bus, 1267 PCI_SLOT(pci_dev_id->devfn), 1268 PCI_FUNC(pci_dev_id->devfn)); 1269 } 1270 spin_unlock_irqrestore(&device_ids_lock, flags); 1271 1272 return count; 1273} 1274static DRIVER_ATTR_RO(slots); 1275 1276static ssize_t irq_handlers_show(struct device_driver *drv, char *buf) 1277{ 1278 struct pcistub_device *psdev; 1279 struct xen_pcibk_dev_data *dev_data; 1280 size_t count = 0; 1281 unsigned long flags; 1282 1283 spin_lock_irqsave(&pcistub_devices_lock, flags); 1284 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1285 if (count >= PAGE_SIZE) 1286 break; 1287 if (!psdev->dev) 1288 continue; 1289 dev_data = pci_get_drvdata(psdev->dev); 1290 if (!dev_data) 1291 continue; 1292 count += 1293 sysfs_emit_at(buf, count, 1294 "%s:%s:%sing:%ld\n", 1295 pci_name(psdev->dev), 1296 dev_data->isr_on ? "on" : "off", 1297 dev_data->ack_intr ? "ack" : "not ack", 1298 dev_data->handled); 1299 } 1300 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1301 return count; 1302} 1303static DRIVER_ATTR_RO(irq_handlers); 1304 1305static ssize_t irq_handler_state_store(struct device_driver *drv, 1306 const char *buf, size_t count) 1307{ 1308 struct pcistub_device *psdev; 1309 struct xen_pcibk_dev_data *dev_data; 1310 int domain, bus, slot, func; 1311 int err; 1312 1313 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1314 if (err) 1315 return err; 1316 1317 psdev = pcistub_device_find(domain, bus, slot, func); 1318 if (!psdev) { 1319 err = -ENOENT; 1320 goto out; 1321 } 1322 1323 dev_data = pci_get_drvdata(psdev->dev); 1324 if (!dev_data) { 1325 err = -ENOENT; 1326 goto out; 1327 } 1328 1329 dev_dbg(&psdev->dev->dev, "%s fake irq handler: %d->%d\n", 1330 dev_data->irq_name, dev_data->isr_on, 1331 !dev_data->isr_on); 1332 1333 dev_data->isr_on = !(dev_data->isr_on); 1334 if (dev_data->isr_on) 1335 dev_data->ack_intr = 1; 1336out: 1337 if (psdev) 1338 pcistub_device_put(psdev); 1339 if (!err) 1340 err = count; 1341 return err; 1342} 1343static DRIVER_ATTR_WO(irq_handler_state); 1344 1345static ssize_t quirks_store(struct device_driver *drv, const char *buf, 1346 size_t count) 1347{ 1348 int domain, bus, slot, func, reg, size, mask; 1349 int err; 1350 1351 err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, 1352 &mask); 1353 if (err) 1354 goto out; 1355 1356 err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); 1357 1358out: 1359 if (!err) 1360 err = count; 1361 return err; 1362} 1363 1364static ssize_t quirks_show(struct device_driver *drv, char *buf) 1365{ 1366 int count = 0; 1367 unsigned long flags; 1368 struct xen_pcibk_config_quirk *quirk; 1369 struct xen_pcibk_dev_data *dev_data; 1370 const struct config_field *field; 1371 const struct config_field_entry *cfg_entry; 1372 1373 spin_lock_irqsave(&device_ids_lock, flags); 1374 list_for_each_entry(quirk, &xen_pcibk_quirks, quirks_list) { 1375 if (count >= PAGE_SIZE) 1376 goto out; 1377 1378 count += sysfs_emit_at(buf, count, 1379 "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", 1380 quirk->pdev->bus->number, 1381 PCI_SLOT(quirk->pdev->devfn), 1382 PCI_FUNC(quirk->pdev->devfn), 1383 quirk->devid.vendor, quirk->devid.device, 1384 quirk->devid.subvendor, 1385 quirk->devid.subdevice); 1386 1387 dev_data = pci_get_drvdata(quirk->pdev); 1388 1389 list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { 1390 field = cfg_entry->field; 1391 if (count >= PAGE_SIZE) 1392 goto out; 1393 1394 count += sysfs_emit_at(buf, count, 1395 "\t\t%08x:%01x:%08x\n", 1396 cfg_entry->base_offset + 1397 field->offset, field->size, 1398 field->mask); 1399 } 1400 } 1401 1402out: 1403 spin_unlock_irqrestore(&device_ids_lock, flags); 1404 1405 return count; 1406} 1407static DRIVER_ATTR_RW(quirks); 1408 1409static ssize_t permissive_store(struct device_driver *drv, const char *buf, 1410 size_t count) 1411{ 1412 int domain, bus, slot, func; 1413 int err; 1414 struct pcistub_device *psdev; 1415 struct xen_pcibk_dev_data *dev_data; 1416 1417 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1418 if (err) 1419 goto out; 1420 1421 psdev = pcistub_device_find(domain, bus, slot, func); 1422 if (!psdev) { 1423 err = -ENODEV; 1424 goto out; 1425 } 1426 1427 dev_data = pci_get_drvdata(psdev->dev); 1428 /* the driver data for a device should never be null at this point */ 1429 if (!dev_data) { 1430 err = -ENXIO; 1431 goto release; 1432 } 1433 if (!dev_data->permissive) { 1434 dev_data->permissive = 1; 1435 /* Let user know that what they're doing could be unsafe */ 1436 dev_warn(&psdev->dev->dev, "enabling permissive mode " 1437 "configuration space accesses!\n"); 1438 dev_warn(&psdev->dev->dev, 1439 "permissive mode is potentially unsafe!\n"); 1440 } 1441release: 1442 pcistub_device_put(psdev); 1443out: 1444 if (!err) 1445 err = count; 1446 return err; 1447} 1448 1449static ssize_t permissive_show(struct device_driver *drv, char *buf) 1450{ 1451 struct pcistub_device *psdev; 1452 struct xen_pcibk_dev_data *dev_data; 1453 size_t count = 0; 1454 unsigned long flags; 1455 spin_lock_irqsave(&pcistub_devices_lock, flags); 1456 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1457 if (count >= PAGE_SIZE) 1458 break; 1459 if (!psdev->dev) 1460 continue; 1461 dev_data = pci_get_drvdata(psdev->dev); 1462 if (!dev_data || !dev_data->permissive) 1463 continue; 1464 count += 1465 sysfs_emit_at(buf, count, "%s\n", 1466 pci_name(psdev->dev)); 1467 } 1468 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1469 return count; 1470} 1471static DRIVER_ATTR_RW(permissive); 1472 1473static ssize_t allow_interrupt_control_store(struct device_driver *drv, 1474 const char *buf, size_t count) 1475{ 1476 int domain, bus, slot, func; 1477 int err; 1478 struct pcistub_device *psdev; 1479 struct xen_pcibk_dev_data *dev_data; 1480 1481 err = str_to_slot(buf, &domain, &bus, &slot, &func); 1482 if (err) 1483 goto out; 1484 1485 psdev = pcistub_device_find(domain, bus, slot, func); 1486 if (!psdev) { 1487 err = -ENODEV; 1488 goto out; 1489 } 1490 1491 dev_data = pci_get_drvdata(psdev->dev); 1492 /* the driver data for a device should never be null at this point */ 1493 if (!dev_data) { 1494 err = -ENXIO; 1495 goto release; 1496 } 1497 dev_data->allow_interrupt_control = 1; 1498release: 1499 pcistub_device_put(psdev); 1500out: 1501 if (!err) 1502 err = count; 1503 return err; 1504} 1505 1506static ssize_t allow_interrupt_control_show(struct device_driver *drv, 1507 char *buf) 1508{ 1509 struct pcistub_device *psdev; 1510 struct xen_pcibk_dev_data *dev_data; 1511 size_t count = 0; 1512 unsigned long flags; 1513 1514 spin_lock_irqsave(&pcistub_devices_lock, flags); 1515 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1516 if (count >= PAGE_SIZE) 1517 break; 1518 if (!psdev->dev) 1519 continue; 1520 dev_data = pci_get_drvdata(psdev->dev); 1521 if (!dev_data || !dev_data->allow_interrupt_control) 1522 continue; 1523 count += 1524 sysfs_emit_at(buf, count, "%s\n", 1525 pci_name(psdev->dev)); 1526 } 1527 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1528 return count; 1529} 1530static DRIVER_ATTR_RW(allow_interrupt_control); 1531 1532static void pcistub_exit(void) 1533{ 1534 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_new_slot); 1535 driver_remove_file(&xen_pcibk_pci_driver.driver, 1536 &driver_attr_remove_slot); 1537 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_slots); 1538 driver_remove_file(&xen_pcibk_pci_driver.driver, &driver_attr_quirks); 1539 driver_remove_file(&xen_pcibk_pci_driver.driver, 1540 &driver_attr_permissive); 1541 driver_remove_file(&xen_pcibk_pci_driver.driver, 1542 &driver_attr_allow_interrupt_control); 1543 driver_remove_file(&xen_pcibk_pci_driver.driver, 1544 &driver_attr_irq_handlers); 1545 driver_remove_file(&xen_pcibk_pci_driver.driver, 1546 &driver_attr_irq_handler_state); 1547 pci_unregister_driver(&xen_pcibk_pci_driver); 1548} 1549 1550static int __init pcistub_init(void) 1551{ 1552 int pos = 0; 1553 int err = 0; 1554 int domain, bus, slot, func; 1555 int parsed; 1556 1557 if (pci_devs_to_hide && *pci_devs_to_hide) { 1558 do { 1559 parsed = 0; 1560 1561 err = sscanf(pci_devs_to_hide + pos, 1562 " (%x:%x:%x.%x) %n", 1563 &domain, &bus, &slot, &func, &parsed); 1564 switch (err) { 1565 case 3: 1566 func = -1; 1567 sscanf(pci_devs_to_hide + pos, 1568 " (%x:%x:%x.*) %n", 1569 &domain, &bus, &slot, &parsed); 1570 break; 1571 case 2: 1572 slot = func = -1; 1573 sscanf(pci_devs_to_hide + pos, 1574 " (%x:%x:*.*) %n", 1575 &domain, &bus, &parsed); 1576 break; 1577 } 1578 1579 if (!parsed) { 1580 domain = 0; 1581 err = sscanf(pci_devs_to_hide + pos, 1582 " (%x:%x.%x) %n", 1583 &bus, &slot, &func, &parsed); 1584 switch (err) { 1585 case 2: 1586 func = -1; 1587 sscanf(pci_devs_to_hide + pos, 1588 " (%x:%x.*) %n", 1589 &bus, &slot, &parsed); 1590 break; 1591 case 1: 1592 slot = func = -1; 1593 sscanf(pci_devs_to_hide + pos, 1594 " (%x:*.*) %n", 1595 &bus, &parsed); 1596 break; 1597 } 1598 } 1599 1600 if (parsed <= 0) 1601 goto parse_error; 1602 1603 err = pcistub_device_id_add(domain, bus, slot, func); 1604 if (err) 1605 goto out; 1606 1607 pos += parsed; 1608 } while (pci_devs_to_hide[pos]); 1609 } 1610 1611 /* If we're the first PCI Device Driver to register, we're the 1612 * first one to get offered PCI devices as they become 1613 * available (and thus we can be the first to grab them) 1614 */ 1615 err = pci_register_driver(&xen_pcibk_pci_driver); 1616 if (err < 0) 1617 goto out; 1618 1619 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1620 &driver_attr_new_slot); 1621 if (!err) 1622 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1623 &driver_attr_remove_slot); 1624 if (!err) 1625 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1626 &driver_attr_slots); 1627 if (!err) 1628 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1629 &driver_attr_quirks); 1630 if (!err) 1631 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1632 &driver_attr_permissive); 1633 if (!err) 1634 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1635 &driver_attr_allow_interrupt_control); 1636 1637 if (!err) 1638 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1639 &driver_attr_irq_handlers); 1640 if (!err) 1641 err = driver_create_file(&xen_pcibk_pci_driver.driver, 1642 &driver_attr_irq_handler_state); 1643 if (err) 1644 pcistub_exit(); 1645 1646out: 1647 return err; 1648 1649parse_error: 1650 pr_err("Error parsing pci_devs_to_hide at \"%s\"\n", 1651 pci_devs_to_hide + pos); 1652 return -EINVAL; 1653} 1654 1655#ifndef MODULE 1656/* 1657 * fs_initcall happens before device_initcall 1658 * so xen_pcibk *should* get called first (b/c we 1659 * want to suck up any device before other drivers 1660 * get a chance by being the first pci device 1661 * driver to register) 1662 */ 1663fs_initcall(pcistub_init); 1664#endif 1665 1666#ifdef CONFIG_PCI_IOV 1667static struct pcistub_device *find_vfs(const struct pci_dev *pdev) 1668{ 1669 struct pcistub_device *psdev = NULL; 1670 unsigned long flags; 1671 bool found = false; 1672 1673 spin_lock_irqsave(&pcistub_devices_lock, flags); 1674 list_for_each_entry(psdev, &pcistub_devices, dev_list) { 1675 if (!psdev->pdev && psdev->dev != pdev 1676 && pci_physfn(psdev->dev) == pdev) { 1677 found = true; 1678 break; 1679 } 1680 } 1681 spin_unlock_irqrestore(&pcistub_devices_lock, flags); 1682 if (found) 1683 return psdev; 1684 return NULL; 1685} 1686 1687static int pci_stub_notifier(struct notifier_block *nb, 1688 unsigned long action, void *data) 1689{ 1690 struct device *dev = data; 1691 const struct pci_dev *pdev = to_pci_dev(dev); 1692 1693 if (action != BUS_NOTIFY_UNBIND_DRIVER) 1694 return NOTIFY_DONE; 1695 1696 if (!pdev->is_physfn) 1697 return NOTIFY_DONE; 1698 1699 for (;;) { 1700 struct pcistub_device *psdev = find_vfs(pdev); 1701 if (!psdev) 1702 break; 1703 device_release_driver(&psdev->dev->dev); 1704 } 1705 return NOTIFY_DONE; 1706} 1707 1708static struct notifier_block pci_stub_nb = { 1709 .notifier_call = pci_stub_notifier, 1710}; 1711#endif 1712 1713static int __init xen_pcibk_init(void) 1714{ 1715 int err; 1716 1717 if (!xen_initial_domain()) 1718 return -ENODEV; 1719 1720 err = xen_pcibk_config_init(); 1721 if (err) 1722 return err; 1723 1724#ifdef MODULE 1725 err = pcistub_init(); 1726 if (err < 0) 1727 return err; 1728#endif 1729 1730 pcistub_init_devices_late(); 1731 err = xen_pcibk_xenbus_register(); 1732 if (err) 1733 pcistub_exit(); 1734#ifdef CONFIG_PCI_IOV 1735 else 1736 bus_register_notifier(&pci_bus_type, &pci_stub_nb); 1737#endif 1738 1739#ifdef CONFIG_XEN_ACPI 1740 xen_acpi_register_get_gsi_func(pcistub_get_gsi_from_sbdf); 1741#endif 1742 1743 return err; 1744} 1745 1746static void __exit xen_pcibk_cleanup(void) 1747{ 1748#ifdef CONFIG_XEN_ACPI 1749 xen_acpi_register_get_gsi_func(NULL); 1750#endif 1751 1752#ifdef CONFIG_PCI_IOV 1753 bus_unregister_notifier(&pci_bus_type, &pci_stub_nb); 1754#endif 1755 xen_pcibk_xenbus_unregister(); 1756 pcistub_exit(); 1757} 1758 1759module_init(xen_pcibk_init); 1760module_exit(xen_pcibk_cleanup); 1761 1762MODULE_DESCRIPTION("Xen PCI-device stub driver"); 1763MODULE_LICENSE("Dual BSD/GPL"); 1764MODULE_ALIAS("xen-backend:pci");
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