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