| 1 | /* |
| 2 | * drivers/pci/pci-driver.c |
| 3 | * |
| 4 | * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com> |
| 5 | * (C) Copyright 2007 Novell Inc. |
| 6 | * |
| 7 | * Released under the GPL v2 only. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/pci.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/device.h> |
| 15 | #include <linux/mempolicy.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/slab.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/cpu.h> |
| 20 | #include "pci.h" |
| 21 | |
| 22 | /* |
| 23 | * Dynamic device IDs are disabled for !CONFIG_HOTPLUG |
| 24 | */ |
| 25 | |
| 26 | struct pci_dynid { |
| 27 | struct list_head node; |
| 28 | struct pci_device_id id; |
| 29 | }; |
| 30 | |
| 31 | #ifdef CONFIG_HOTPLUG |
| 32 | |
| 33 | /** |
| 34 | * store_new_id - add a new PCI device ID to this driver and re-probe devices |
| 35 | * @driver: target device driver |
| 36 | * @buf: buffer for scanning device ID data |
| 37 | * @count: input size |
| 38 | * |
| 39 | * Adds a new dynamic pci device ID to this driver, |
| 40 | * and causes the driver to probe for all devices again. |
| 41 | */ |
| 42 | static ssize_t |
| 43 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
| 44 | { |
| 45 | struct pci_dynid *dynid; |
| 46 | struct pci_driver *pdrv = to_pci_driver(driver); |
| 47 | const struct pci_device_id *ids = pdrv->id_table; |
| 48 | __u32 vendor, device, subvendor=PCI_ANY_ID, |
| 49 | subdevice=PCI_ANY_ID, class=0, class_mask=0; |
| 50 | unsigned long driver_data=0; |
| 51 | int fields=0; |
| 52 | int retval=0; |
| 53 | |
| 54 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
| 55 | &vendor, &device, &subvendor, &subdevice, |
| 56 | &class, &class_mask, &driver_data); |
| 57 | if (fields < 2) |
| 58 | return -EINVAL; |
| 59 | |
| 60 | /* Only accept driver_data values that match an existing id_table |
| 61 | entry */ |
| 62 | if (ids) { |
| 63 | retval = -EINVAL; |
| 64 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
| 65 | if (driver_data == ids->driver_data) { |
| 66 | retval = 0; |
| 67 | break; |
| 68 | } |
| 69 | ids++; |
| 70 | } |
| 71 | if (retval) /* No match */ |
| 72 | return retval; |
| 73 | } |
| 74 | |
| 75 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
| 76 | if (!dynid) |
| 77 | return -ENOMEM; |
| 78 | |
| 79 | dynid->id.vendor = vendor; |
| 80 | dynid->id.device = device; |
| 81 | dynid->id.subvendor = subvendor; |
| 82 | dynid->id.subdevice = subdevice; |
| 83 | dynid->id.class = class; |
| 84 | dynid->id.class_mask = class_mask; |
| 85 | dynid->id.driver_data = driver_data; |
| 86 | |
| 87 | spin_lock(&pdrv->dynids.lock); |
| 88 | list_add_tail(&dynid->node, &pdrv->dynids.list); |
| 89 | spin_unlock(&pdrv->dynids.lock); |
| 90 | |
| 91 | if (get_driver(&pdrv->driver)) { |
| 92 | retval = driver_attach(&pdrv->driver); |
| 93 | put_driver(&pdrv->driver); |
| 94 | } |
| 95 | |
| 96 | if (retval) |
| 97 | return retval; |
| 98 | return count; |
| 99 | } |
| 100 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
| 101 | |
| 102 | /** |
| 103 | * store_remove_id - remove a PCI device ID from this driver |
| 104 | * @driver: target device driver |
| 105 | * @buf: buffer for scanning device ID data |
| 106 | * @count: input size |
| 107 | * |
| 108 | * Removes a dynamic pci device ID to this driver. |
| 109 | */ |
| 110 | static ssize_t |
| 111 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) |
| 112 | { |
| 113 | struct pci_dynid *dynid, *n; |
| 114 | struct pci_driver *pdrv = to_pci_driver(driver); |
| 115 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
| 116 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; |
| 117 | int fields = 0; |
| 118 | int retval = -ENODEV; |
| 119 | |
| 120 | fields = sscanf(buf, "%x %x %x %x %x %x", |
| 121 | &vendor, &device, &subvendor, &subdevice, |
| 122 | &class, &class_mask); |
| 123 | if (fields < 2) |
| 124 | return -EINVAL; |
| 125 | |
| 126 | spin_lock(&pdrv->dynids.lock); |
| 127 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { |
| 128 | struct pci_device_id *id = &dynid->id; |
| 129 | if ((id->vendor == vendor) && |
| 130 | (id->device == device) && |
| 131 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && |
| 132 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && |
| 133 | !((id->class ^ class) & class_mask)) { |
| 134 | list_del(&dynid->node); |
| 135 | kfree(dynid); |
| 136 | retval = 0; |
| 137 | break; |
| 138 | } |
| 139 | } |
| 140 | spin_unlock(&pdrv->dynids.lock); |
| 141 | |
| 142 | if (retval) |
| 143 | return retval; |
| 144 | return count; |
| 145 | } |
| 146 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
| 147 | |
| 148 | static void |
| 149 | pci_free_dynids(struct pci_driver *drv) |
| 150 | { |
| 151 | struct pci_dynid *dynid, *n; |
| 152 | |
| 153 | spin_lock(&drv->dynids.lock); |
| 154 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { |
| 155 | list_del(&dynid->node); |
| 156 | kfree(dynid); |
| 157 | } |
| 158 | spin_unlock(&drv->dynids.lock); |
| 159 | } |
| 160 | |
| 161 | static int |
| 162 | pci_create_newid_file(struct pci_driver *drv) |
| 163 | { |
| 164 | int error = 0; |
| 165 | if (drv->probe != NULL) |
| 166 | error = driver_create_file(&drv->driver, &driver_attr_new_id); |
| 167 | return error; |
| 168 | } |
| 169 | |
| 170 | static void pci_remove_newid_file(struct pci_driver *drv) |
| 171 | { |
| 172 | driver_remove_file(&drv->driver, &driver_attr_new_id); |
| 173 | } |
| 174 | |
| 175 | static int |
| 176 | pci_create_removeid_file(struct pci_driver *drv) |
| 177 | { |
| 178 | int error = 0; |
| 179 | if (drv->probe != NULL) |
| 180 | error = driver_create_file(&drv->driver,&driver_attr_remove_id); |
| 181 | return error; |
| 182 | } |
| 183 | |
| 184 | static void pci_remove_removeid_file(struct pci_driver *drv) |
| 185 | { |
| 186 | driver_remove_file(&drv->driver, &driver_attr_remove_id); |
| 187 | } |
| 188 | #else /* !CONFIG_HOTPLUG */ |
| 189 | static inline void pci_free_dynids(struct pci_driver *drv) {} |
| 190 | static inline int pci_create_newid_file(struct pci_driver *drv) |
| 191 | { |
| 192 | return 0; |
| 193 | } |
| 194 | static inline void pci_remove_newid_file(struct pci_driver *drv) {} |
| 195 | static inline int pci_create_removeid_file(struct pci_driver *drv) |
| 196 | { |
| 197 | return 0; |
| 198 | } |
| 199 | static inline void pci_remove_removeid_file(struct pci_driver *drv) {} |
| 200 | #endif |
| 201 | |
| 202 | /** |
| 203 | * pci_match_id - See if a pci device matches a given pci_id table |
| 204 | * @ids: array of PCI device id structures to search in |
| 205 | * @dev: the PCI device structure to match against. |
| 206 | * |
| 207 | * Used by a driver to check whether a PCI device present in the |
| 208 | * system is in its list of supported devices. Returns the matching |
| 209 | * pci_device_id structure or %NULL if there is no match. |
| 210 | * |
| 211 | * Deprecated, don't use this as it will not catch any dynamic ids |
| 212 | * that a driver might want to check for. |
| 213 | */ |
| 214 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
| 215 | struct pci_dev *dev) |
| 216 | { |
| 217 | if (ids) { |
| 218 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
| 219 | if (pci_match_one_device(ids, dev)) |
| 220 | return ids; |
| 221 | ids++; |
| 222 | } |
| 223 | } |
| 224 | return NULL; |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
| 229 | * @drv: the PCI driver to match against |
| 230 | * @dev: the PCI device structure to match against |
| 231 | * |
| 232 | * Used by a driver to check whether a PCI device present in the |
| 233 | * system is in its list of supported devices. Returns the matching |
| 234 | * pci_device_id structure or %NULL if there is no match. |
| 235 | */ |
| 236 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
| 237 | struct pci_dev *dev) |
| 238 | { |
| 239 | struct pci_dynid *dynid; |
| 240 | |
| 241 | /* Look at the dynamic ids first, before the static ones */ |
| 242 | spin_lock(&drv->dynids.lock); |
| 243 | list_for_each_entry(dynid, &drv->dynids.list, node) { |
| 244 | if (pci_match_one_device(&dynid->id, dev)) { |
| 245 | spin_unlock(&drv->dynids.lock); |
| 246 | return &dynid->id; |
| 247 | } |
| 248 | } |
| 249 | spin_unlock(&drv->dynids.lock); |
| 250 | |
| 251 | return pci_match_id(drv->id_table, dev); |
| 252 | } |
| 253 | |
| 254 | struct drv_dev_and_id { |
| 255 | struct pci_driver *drv; |
| 256 | struct pci_dev *dev; |
| 257 | const struct pci_device_id *id; |
| 258 | }; |
| 259 | |
| 260 | static long local_pci_probe(void *_ddi) |
| 261 | { |
| 262 | struct drv_dev_and_id *ddi = _ddi; |
| 263 | |
| 264 | return ddi->drv->probe(ddi->dev, ddi->id); |
| 265 | } |
| 266 | |
| 267 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
| 268 | const struct pci_device_id *id) |
| 269 | { |
| 270 | int error, node; |
| 271 | struct drv_dev_and_id ddi = { drv, dev, id }; |
| 272 | |
| 273 | /* Execute driver initialization on node where the device's |
| 274 | bus is attached to. This way the driver likely allocates |
| 275 | its local memory on the right node without any need to |
| 276 | change it. */ |
| 277 | node = dev_to_node(&dev->dev); |
| 278 | if (node >= 0) { |
| 279 | int cpu; |
| 280 | |
| 281 | get_online_cpus(); |
| 282 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
| 283 | if (cpu < nr_cpu_ids) |
| 284 | error = work_on_cpu(cpu, local_pci_probe, &ddi); |
| 285 | else |
| 286 | error = local_pci_probe(&ddi); |
| 287 | put_online_cpus(); |
| 288 | } else |
| 289 | error = local_pci_probe(&ddi); |
| 290 | return error; |
| 291 | } |
| 292 | |
| 293 | /** |
| 294 | * __pci_device_probe() |
| 295 | * @drv: driver to call to check if it wants the PCI device |
| 296 | * @pci_dev: PCI device being probed |
| 297 | * |
| 298 | * returns 0 on success, else error. |
| 299 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
| 300 | */ |
| 301 | static int |
| 302 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
| 303 | { |
| 304 | const struct pci_device_id *id; |
| 305 | int error = 0; |
| 306 | |
| 307 | if (!pci_dev->driver && drv->probe) { |
| 308 | error = -ENODEV; |
| 309 | |
| 310 | id = pci_match_device(drv, pci_dev); |
| 311 | if (id) |
| 312 | error = pci_call_probe(drv, pci_dev, id); |
| 313 | if (error >= 0) { |
| 314 | pci_dev->driver = drv; |
| 315 | error = 0; |
| 316 | } |
| 317 | } |
| 318 | return error; |
| 319 | } |
| 320 | |
| 321 | static int pci_device_probe(struct device * dev) |
| 322 | { |
| 323 | int error = 0; |
| 324 | struct pci_driver *drv; |
| 325 | struct pci_dev *pci_dev; |
| 326 | |
| 327 | drv = to_pci_driver(dev->driver); |
| 328 | pci_dev = to_pci_dev(dev); |
| 329 | pci_dev_get(pci_dev); |
| 330 | error = __pci_device_probe(drv, pci_dev); |
| 331 | if (error) |
| 332 | pci_dev_put(pci_dev); |
| 333 | |
| 334 | return error; |
| 335 | } |
| 336 | |
| 337 | static int pci_device_remove(struct device * dev) |
| 338 | { |
| 339 | struct pci_dev * pci_dev = to_pci_dev(dev); |
| 340 | struct pci_driver * drv = pci_dev->driver; |
| 341 | |
| 342 | if (drv) { |
| 343 | if (drv->remove) |
| 344 | drv->remove(pci_dev); |
| 345 | pci_dev->driver = NULL; |
| 346 | } |
| 347 | |
| 348 | /* |
| 349 | * If the device is still on, set the power state as "unknown", |
| 350 | * since it might change by the next time we load the driver. |
| 351 | */ |
| 352 | if (pci_dev->current_state == PCI_D0) |
| 353 | pci_dev->current_state = PCI_UNKNOWN; |
| 354 | |
| 355 | /* |
| 356 | * We would love to complain here if pci_dev->is_enabled is set, that |
| 357 | * the driver should have called pci_disable_device(), but the |
| 358 | * unfortunate fact is there are too many odd BIOS and bridge setups |
| 359 | * that don't like drivers doing that all of the time. |
| 360 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
| 361 | * horrible the crap we have to deal with is when we are awake... |
| 362 | */ |
| 363 | |
| 364 | pci_dev_put(pci_dev); |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static void pci_device_shutdown(struct device *dev) |
| 369 | { |
| 370 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 371 | struct pci_driver *drv = pci_dev->driver; |
| 372 | |
| 373 | if (drv && drv->shutdown) |
| 374 | drv->shutdown(pci_dev); |
| 375 | pci_msi_shutdown(pci_dev); |
| 376 | pci_msix_shutdown(pci_dev); |
| 377 | } |
| 378 | |
| 379 | #ifdef CONFIG_PM_SLEEP |
| 380 | |
| 381 | /* |
| 382 | * Default "suspend" method for devices that have no driver provided suspend, |
| 383 | * or not even a driver at all (second part). |
| 384 | */ |
| 385 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
| 386 | { |
| 387 | /* |
| 388 | * mark its power state as "unknown", since we don't know if |
| 389 | * e.g. the BIOS will change its device state when we suspend. |
| 390 | */ |
| 391 | if (pci_dev->current_state == PCI_D0) |
| 392 | pci_dev->current_state = PCI_UNKNOWN; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Default "resume" method for devices that have no driver provided resume, |
| 397 | * or not even a driver at all (second part). |
| 398 | */ |
| 399 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
| 400 | { |
| 401 | int retval; |
| 402 | |
| 403 | /* if the device was enabled before suspend, reenable */ |
| 404 | retval = pci_reenable_device(pci_dev); |
| 405 | /* |
| 406 | * if the device was busmaster before the suspend, make it busmaster |
| 407 | * again |
| 408 | */ |
| 409 | if (pci_dev->is_busmaster) |
| 410 | pci_set_master(pci_dev); |
| 411 | |
| 412 | return retval; |
| 413 | } |
| 414 | |
| 415 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) |
| 416 | { |
| 417 | struct pci_dev * pci_dev = to_pci_dev(dev); |
| 418 | struct pci_driver * drv = pci_dev->driver; |
| 419 | |
| 420 | pci_dev->state_saved = false; |
| 421 | |
| 422 | if (drv && drv->suspend) { |
| 423 | pci_power_t prev = pci_dev->current_state; |
| 424 | int error; |
| 425 | |
| 426 | error = drv->suspend(pci_dev, state); |
| 427 | suspend_report_result(drv->suspend, error); |
| 428 | if (error) |
| 429 | return error; |
| 430 | |
| 431 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
| 432 | && pci_dev->current_state != PCI_UNKNOWN) { |
| 433 | WARN_ONCE(pci_dev->current_state != prev, |
| 434 | "PCI PM: Device state not saved by %pF\n", |
| 435 | drv->suspend); |
| 436 | } |
| 437 | } |
| 438 | |
| 439 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
| 440 | |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
| 445 | { |
| 446 | struct pci_dev * pci_dev = to_pci_dev(dev); |
| 447 | struct pci_driver * drv = pci_dev->driver; |
| 448 | |
| 449 | if (drv && drv->suspend_late) { |
| 450 | pci_power_t prev = pci_dev->current_state; |
| 451 | int error; |
| 452 | |
| 453 | error = drv->suspend_late(pci_dev, state); |
| 454 | suspend_report_result(drv->suspend_late, error); |
| 455 | if (error) |
| 456 | return error; |
| 457 | |
| 458 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
| 459 | && pci_dev->current_state != PCI_UNKNOWN) { |
| 460 | WARN_ONCE(pci_dev->current_state != prev, |
| 461 | "PCI PM: Device state not saved by %pF\n", |
| 462 | drv->suspend_late); |
| 463 | return 0; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | if (!pci_dev->state_saved) |
| 468 | pci_save_state(pci_dev); |
| 469 | |
| 470 | pci_pm_set_unknown_state(pci_dev); |
| 471 | |
| 472 | return 0; |
| 473 | } |
| 474 | |
| 475 | static int pci_legacy_resume_early(struct device *dev) |
| 476 | { |
| 477 | struct pci_dev * pci_dev = to_pci_dev(dev); |
| 478 | struct pci_driver * drv = pci_dev->driver; |
| 479 | |
| 480 | return drv && drv->resume_early ? |
| 481 | drv->resume_early(pci_dev) : 0; |
| 482 | } |
| 483 | |
| 484 | static int pci_legacy_resume(struct device *dev) |
| 485 | { |
| 486 | struct pci_dev * pci_dev = to_pci_dev(dev); |
| 487 | struct pci_driver * drv = pci_dev->driver; |
| 488 | |
| 489 | pci_fixup_device(pci_fixup_resume, pci_dev); |
| 490 | |
| 491 | return drv && drv->resume ? |
| 492 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); |
| 493 | } |
| 494 | |
| 495 | /* Auxiliary functions used by the new power management framework */ |
| 496 | |
| 497 | /** |
| 498 | * pci_restore_standard_config - restore standard config registers of PCI device |
| 499 | * @pci_dev: PCI device to handle |
| 500 | */ |
| 501 | static int pci_restore_standard_config(struct pci_dev *pci_dev) |
| 502 | { |
| 503 | pci_update_current_state(pci_dev, PCI_UNKNOWN); |
| 504 | |
| 505 | if (pci_dev->current_state != PCI_D0) { |
| 506 | int error = pci_set_power_state(pci_dev, PCI_D0); |
| 507 | if (error) |
| 508 | return error; |
| 509 | } |
| 510 | |
| 511 | return pci_dev->state_saved ? pci_restore_state(pci_dev) : 0; |
| 512 | } |
| 513 | |
| 514 | static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev) |
| 515 | { |
| 516 | pci_restore_standard_config(pci_dev); |
| 517 | pci_dev->state_saved = false; |
| 518 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
| 519 | } |
| 520 | |
| 521 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
| 522 | { |
| 523 | pci_fixup_device(pci_fixup_resume, pci_dev); |
| 524 | |
| 525 | if (!pci_is_bridge(pci_dev)) |
| 526 | pci_enable_wake(pci_dev, PCI_D0, false); |
| 527 | } |
| 528 | |
| 529 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
| 530 | { |
| 531 | /* Disable non-bridge devices without PM support */ |
| 532 | if (!pci_is_bridge(pci_dev)) |
| 533 | pci_disable_enabled_device(pci_dev); |
| 534 | } |
| 535 | |
| 536 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
| 537 | { |
| 538 | struct pci_driver *drv = pci_dev->driver; |
| 539 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
| 540 | || drv->resume_early); |
| 541 | |
| 542 | /* |
| 543 | * Legacy PM support is used by default, so warn if the new framework is |
| 544 | * supported as well. Drivers are supposed to support either the |
| 545 | * former, or the latter, but not both at the same time. |
| 546 | */ |
| 547 | WARN_ON(ret && drv->driver.pm); |
| 548 | |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | /* New power management framework */ |
| 553 | |
| 554 | static int pci_pm_prepare(struct device *dev) |
| 555 | { |
| 556 | struct device_driver *drv = dev->driver; |
| 557 | int error = 0; |
| 558 | |
| 559 | if (drv && drv->pm && drv->pm->prepare) |
| 560 | error = drv->pm->prepare(dev); |
| 561 | |
| 562 | return error; |
| 563 | } |
| 564 | |
| 565 | static void pci_pm_complete(struct device *dev) |
| 566 | { |
| 567 | struct device_driver *drv = dev->driver; |
| 568 | |
| 569 | if (drv && drv->pm && drv->pm->complete) |
| 570 | drv->pm->complete(dev); |
| 571 | } |
| 572 | |
| 573 | #ifdef CONFIG_SUSPEND |
| 574 | |
| 575 | static int pci_pm_suspend(struct device *dev) |
| 576 | { |
| 577 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 578 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 579 | |
| 580 | if (pci_has_legacy_pm_support(pci_dev)) |
| 581 | return pci_legacy_suspend(dev, PMSG_SUSPEND); |
| 582 | |
| 583 | pci_dev->state_saved = false; |
| 584 | |
| 585 | if (!pm) { |
| 586 | pci_pm_default_suspend(pci_dev); |
| 587 | goto Fixup; |
| 588 | } |
| 589 | |
| 590 | if (pm->suspend) { |
| 591 | pci_power_t prev = pci_dev->current_state; |
| 592 | int error; |
| 593 | |
| 594 | error = pm->suspend(dev); |
| 595 | suspend_report_result(pm->suspend, error); |
| 596 | if (error) |
| 597 | return error; |
| 598 | |
| 599 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
| 600 | && pci_dev->current_state != PCI_UNKNOWN) { |
| 601 | WARN_ONCE(pci_dev->current_state != prev, |
| 602 | "PCI PM: State of device not saved by %pF\n", |
| 603 | pm->suspend); |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | Fixup: |
| 608 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
| 609 | |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | static int pci_pm_suspend_noirq(struct device *dev) |
| 614 | { |
| 615 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 616 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 617 | |
| 618 | if (pci_has_legacy_pm_support(pci_dev)) |
| 619 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); |
| 620 | |
| 621 | if (!pm) { |
| 622 | pci_save_state(pci_dev); |
| 623 | return 0; |
| 624 | } |
| 625 | |
| 626 | if (pm->suspend_noirq) { |
| 627 | pci_power_t prev = pci_dev->current_state; |
| 628 | int error; |
| 629 | |
| 630 | error = pm->suspend_noirq(dev); |
| 631 | suspend_report_result(pm->suspend_noirq, error); |
| 632 | if (error) |
| 633 | return error; |
| 634 | |
| 635 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
| 636 | && pci_dev->current_state != PCI_UNKNOWN) { |
| 637 | WARN_ONCE(pci_dev->current_state != prev, |
| 638 | "PCI PM: State of device not saved by %pF\n", |
| 639 | pm->suspend_noirq); |
| 640 | return 0; |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | if (!pci_dev->state_saved) { |
| 645 | pci_save_state(pci_dev); |
| 646 | if (!pci_is_bridge(pci_dev)) |
| 647 | pci_prepare_to_sleep(pci_dev); |
| 648 | } |
| 649 | |
| 650 | pci_pm_set_unknown_state(pci_dev); |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static int pci_pm_resume_noirq(struct device *dev) |
| 656 | { |
| 657 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 658 | struct device_driver *drv = dev->driver; |
| 659 | int error = 0; |
| 660 | |
| 661 | pci_pm_default_resume_noirq(pci_dev); |
| 662 | |
| 663 | if (pci_has_legacy_pm_support(pci_dev)) |
| 664 | return pci_legacy_resume_early(dev); |
| 665 | |
| 666 | if (drv && drv->pm && drv->pm->resume_noirq) |
| 667 | error = drv->pm->resume_noirq(dev); |
| 668 | |
| 669 | return error; |
| 670 | } |
| 671 | |
| 672 | static int pci_pm_resume(struct device *dev) |
| 673 | { |
| 674 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 675 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 676 | int error = 0; |
| 677 | |
| 678 | /* |
| 679 | * This is necessary for the suspend error path in which resume is |
| 680 | * called without restoring the standard config registers of the device. |
| 681 | */ |
| 682 | if (pci_dev->state_saved) |
| 683 | pci_restore_standard_config(pci_dev); |
| 684 | |
| 685 | if (pci_has_legacy_pm_support(pci_dev)) |
| 686 | return pci_legacy_resume(dev); |
| 687 | |
| 688 | pci_pm_default_resume(pci_dev); |
| 689 | |
| 690 | if (pm) { |
| 691 | if (pm->resume) |
| 692 | error = pm->resume(dev); |
| 693 | } else { |
| 694 | pci_pm_reenable_device(pci_dev); |
| 695 | } |
| 696 | |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | #else /* !CONFIG_SUSPEND */ |
| 701 | |
| 702 | #define pci_pm_suspend NULL |
| 703 | #define pci_pm_suspend_noirq NULL |
| 704 | #define pci_pm_resume NULL |
| 705 | #define pci_pm_resume_noirq NULL |
| 706 | |
| 707 | #endif /* !CONFIG_SUSPEND */ |
| 708 | |
| 709 | #ifdef CONFIG_HIBERNATION |
| 710 | |
| 711 | static int pci_pm_freeze(struct device *dev) |
| 712 | { |
| 713 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 714 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 715 | |
| 716 | if (pci_has_legacy_pm_support(pci_dev)) |
| 717 | return pci_legacy_suspend(dev, PMSG_FREEZE); |
| 718 | |
| 719 | pci_dev->state_saved = false; |
| 720 | |
| 721 | if (!pm) { |
| 722 | pci_pm_default_suspend(pci_dev); |
| 723 | return 0; |
| 724 | } |
| 725 | |
| 726 | if (pm->freeze) { |
| 727 | int error; |
| 728 | |
| 729 | error = pm->freeze(dev); |
| 730 | suspend_report_result(pm->freeze, error); |
| 731 | if (error) |
| 732 | return error; |
| 733 | } |
| 734 | |
| 735 | return 0; |
| 736 | } |
| 737 | |
| 738 | static int pci_pm_freeze_noirq(struct device *dev) |
| 739 | { |
| 740 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 741 | struct device_driver *drv = dev->driver; |
| 742 | |
| 743 | if (pci_has_legacy_pm_support(pci_dev)) |
| 744 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); |
| 745 | |
| 746 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
| 747 | int error; |
| 748 | |
| 749 | error = drv->pm->freeze_noirq(dev); |
| 750 | suspend_report_result(drv->pm->freeze_noirq, error); |
| 751 | if (error) |
| 752 | return error; |
| 753 | } |
| 754 | |
| 755 | if (!pci_dev->state_saved) |
| 756 | pci_save_state(pci_dev); |
| 757 | |
| 758 | pci_pm_set_unknown_state(pci_dev); |
| 759 | |
| 760 | return 0; |
| 761 | } |
| 762 | |
| 763 | static int pci_pm_thaw_noirq(struct device *dev) |
| 764 | { |
| 765 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 766 | struct device_driver *drv = dev->driver; |
| 767 | int error = 0; |
| 768 | |
| 769 | if (pci_has_legacy_pm_support(pci_dev)) |
| 770 | return pci_legacy_resume_early(dev); |
| 771 | |
| 772 | pci_update_current_state(pci_dev, PCI_D0); |
| 773 | |
| 774 | if (drv && drv->pm && drv->pm->thaw_noirq) |
| 775 | error = drv->pm->thaw_noirq(dev); |
| 776 | |
| 777 | return error; |
| 778 | } |
| 779 | |
| 780 | static int pci_pm_thaw(struct device *dev) |
| 781 | { |
| 782 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 783 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 784 | int error = 0; |
| 785 | |
| 786 | if (pci_has_legacy_pm_support(pci_dev)) |
| 787 | return pci_legacy_resume(dev); |
| 788 | |
| 789 | if (pm) { |
| 790 | if (pm->thaw) |
| 791 | error = pm->thaw(dev); |
| 792 | } else { |
| 793 | pci_pm_reenable_device(pci_dev); |
| 794 | } |
| 795 | |
| 796 | return error; |
| 797 | } |
| 798 | |
| 799 | static int pci_pm_poweroff(struct device *dev) |
| 800 | { |
| 801 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 802 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 803 | |
| 804 | if (pci_has_legacy_pm_support(pci_dev)) |
| 805 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); |
| 806 | |
| 807 | pci_dev->state_saved = false; |
| 808 | |
| 809 | if (!pm) { |
| 810 | pci_pm_default_suspend(pci_dev); |
| 811 | goto Fixup; |
| 812 | } |
| 813 | |
| 814 | if (pm->poweroff) { |
| 815 | int error; |
| 816 | |
| 817 | error = pm->poweroff(dev); |
| 818 | suspend_report_result(pm->poweroff, error); |
| 819 | if (error) |
| 820 | return error; |
| 821 | } |
| 822 | |
| 823 | Fixup: |
| 824 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
| 825 | |
| 826 | return 0; |
| 827 | } |
| 828 | |
| 829 | static int pci_pm_poweroff_noirq(struct device *dev) |
| 830 | { |
| 831 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 832 | struct device_driver *drv = dev->driver; |
| 833 | |
| 834 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
| 835 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); |
| 836 | |
| 837 | if (!drv || !drv->pm) |
| 838 | return 0; |
| 839 | |
| 840 | if (drv->pm->poweroff_noirq) { |
| 841 | int error; |
| 842 | |
| 843 | error = drv->pm->poweroff_noirq(dev); |
| 844 | suspend_report_result(drv->pm->poweroff_noirq, error); |
| 845 | if (error) |
| 846 | return error; |
| 847 | } |
| 848 | |
| 849 | if (!pci_dev->state_saved && !pci_is_bridge(pci_dev)) |
| 850 | pci_prepare_to_sleep(pci_dev); |
| 851 | |
| 852 | return 0; |
| 853 | } |
| 854 | |
| 855 | static int pci_pm_restore_noirq(struct device *dev) |
| 856 | { |
| 857 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 858 | struct device_driver *drv = dev->driver; |
| 859 | int error = 0; |
| 860 | |
| 861 | pci_pm_default_resume_noirq(pci_dev); |
| 862 | |
| 863 | if (pci_has_legacy_pm_support(pci_dev)) |
| 864 | return pci_legacy_resume_early(dev); |
| 865 | |
| 866 | if (drv && drv->pm && drv->pm->restore_noirq) |
| 867 | error = drv->pm->restore_noirq(dev); |
| 868 | |
| 869 | return error; |
| 870 | } |
| 871 | |
| 872 | static int pci_pm_restore(struct device *dev) |
| 873 | { |
| 874 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 875 | struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| 876 | int error = 0; |
| 877 | |
| 878 | /* |
| 879 | * This is necessary for the hibernation error path in which restore is |
| 880 | * called without restoring the standard config registers of the device. |
| 881 | */ |
| 882 | if (pci_dev->state_saved) |
| 883 | pci_restore_standard_config(pci_dev); |
| 884 | |
| 885 | if (pci_has_legacy_pm_support(pci_dev)) |
| 886 | return pci_legacy_resume(dev); |
| 887 | |
| 888 | pci_pm_default_resume(pci_dev); |
| 889 | |
| 890 | if (pm) { |
| 891 | if (pm->restore) |
| 892 | error = pm->restore(dev); |
| 893 | } else { |
| 894 | pci_pm_reenable_device(pci_dev); |
| 895 | } |
| 896 | |
| 897 | return error; |
| 898 | } |
| 899 | |
| 900 | #else /* !CONFIG_HIBERNATION */ |
| 901 | |
| 902 | #define pci_pm_freeze NULL |
| 903 | #define pci_pm_freeze_noirq NULL |
| 904 | #define pci_pm_thaw NULL |
| 905 | #define pci_pm_thaw_noirq NULL |
| 906 | #define pci_pm_poweroff NULL |
| 907 | #define pci_pm_poweroff_noirq NULL |
| 908 | #define pci_pm_restore NULL |
| 909 | #define pci_pm_restore_noirq NULL |
| 910 | |
| 911 | #endif /* !CONFIG_HIBERNATION */ |
| 912 | |
| 913 | struct dev_pm_ops pci_dev_pm_ops = { |
| 914 | .prepare = pci_pm_prepare, |
| 915 | .complete = pci_pm_complete, |
| 916 | .suspend = pci_pm_suspend, |
| 917 | .resume = pci_pm_resume, |
| 918 | .freeze = pci_pm_freeze, |
| 919 | .thaw = pci_pm_thaw, |
| 920 | .poweroff = pci_pm_poweroff, |
| 921 | .restore = pci_pm_restore, |
| 922 | .suspend_noirq = pci_pm_suspend_noirq, |
| 923 | .resume_noirq = pci_pm_resume_noirq, |
| 924 | .freeze_noirq = pci_pm_freeze_noirq, |
| 925 | .thaw_noirq = pci_pm_thaw_noirq, |
| 926 | .poweroff_noirq = pci_pm_poweroff_noirq, |
| 927 | .restore_noirq = pci_pm_restore_noirq, |
| 928 | }; |
| 929 | |
| 930 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
| 931 | |
| 932 | #else /* !CONFIG_PM_SLEEP */ |
| 933 | |
| 934 | #define PCI_PM_OPS_PTR NULL |
| 935 | |
| 936 | #endif /* !CONFIG_PM_SLEEP */ |
| 937 | |
| 938 | /** |
| 939 | * __pci_register_driver - register a new pci driver |
| 940 | * @drv: the driver structure to register |
| 941 | * @owner: owner module of drv |
| 942 | * @mod_name: module name string |
| 943 | * |
| 944 | * Adds the driver structure to the list of registered drivers. |
| 945 | * Returns a negative value on error, otherwise 0. |
| 946 | * If no error occurred, the driver remains registered even if |
| 947 | * no device was claimed during registration. |
| 948 | */ |
| 949 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
| 950 | const char *mod_name) |
| 951 | { |
| 952 | int error; |
| 953 | |
| 954 | /* initialize common driver fields */ |
| 955 | drv->driver.name = drv->name; |
| 956 | drv->driver.bus = &pci_bus_type; |
| 957 | drv->driver.owner = owner; |
| 958 | drv->driver.mod_name = mod_name; |
| 959 | |
| 960 | spin_lock_init(&drv->dynids.lock); |
| 961 | INIT_LIST_HEAD(&drv->dynids.list); |
| 962 | |
| 963 | /* register with core */ |
| 964 | error = driver_register(&drv->driver); |
| 965 | if (error) |
| 966 | goto out; |
| 967 | |
| 968 | error = pci_create_newid_file(drv); |
| 969 | if (error) |
| 970 | goto out_newid; |
| 971 | |
| 972 | error = pci_create_removeid_file(drv); |
| 973 | if (error) |
| 974 | goto out_removeid; |
| 975 | out: |
| 976 | return error; |
| 977 | |
| 978 | out_removeid: |
| 979 | pci_remove_newid_file(drv); |
| 980 | out_newid: |
| 981 | driver_unregister(&drv->driver); |
| 982 | goto out; |
| 983 | } |
| 984 | |
| 985 | /** |
| 986 | * pci_unregister_driver - unregister a pci driver |
| 987 | * @drv: the driver structure to unregister |
| 988 | * |
| 989 | * Deletes the driver structure from the list of registered PCI drivers, |
| 990 | * gives it a chance to clean up by calling its remove() function for |
| 991 | * each device it was responsible for, and marks those devices as |
| 992 | * driverless. |
| 993 | */ |
| 994 | |
| 995 | void |
| 996 | pci_unregister_driver(struct pci_driver *drv) |
| 997 | { |
| 998 | pci_remove_removeid_file(drv); |
| 999 | pci_remove_newid_file(drv); |
| 1000 | driver_unregister(&drv->driver); |
| 1001 | pci_free_dynids(drv); |
| 1002 | } |
| 1003 | |
| 1004 | static struct pci_driver pci_compat_driver = { |
| 1005 | .name = "compat" |
| 1006 | }; |
| 1007 | |
| 1008 | /** |
| 1009 | * pci_dev_driver - get the pci_driver of a device |
| 1010 | * @dev: the device to query |
| 1011 | * |
| 1012 | * Returns the appropriate pci_driver structure or %NULL if there is no |
| 1013 | * registered driver for the device. |
| 1014 | */ |
| 1015 | struct pci_driver * |
| 1016 | pci_dev_driver(const struct pci_dev *dev) |
| 1017 | { |
| 1018 | if (dev->driver) |
| 1019 | return dev->driver; |
| 1020 | else { |
| 1021 | int i; |
| 1022 | for(i=0; i<=PCI_ROM_RESOURCE; i++) |
| 1023 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
| 1024 | return &pci_compat_driver; |
| 1025 | } |
| 1026 | return NULL; |
| 1027 | } |
| 1028 | |
| 1029 | /** |
| 1030 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure |
| 1031 | * @dev: the PCI device structure to match against |
| 1032 | * @drv: the device driver to search for matching PCI device id structures |
| 1033 | * |
| 1034 | * Used by a driver to check whether a PCI device present in the |
| 1035 | * system is in its list of supported devices. Returns the matching |
| 1036 | * pci_device_id structure or %NULL if there is no match. |
| 1037 | */ |
| 1038 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
| 1039 | { |
| 1040 | struct pci_dev *pci_dev = to_pci_dev(dev); |
| 1041 | struct pci_driver *pci_drv = to_pci_driver(drv); |
| 1042 | const struct pci_device_id *found_id; |
| 1043 | |
| 1044 | found_id = pci_match_device(pci_drv, pci_dev); |
| 1045 | if (found_id) |
| 1046 | return 1; |
| 1047 | |
| 1048 | return 0; |
| 1049 | } |
| 1050 | |
| 1051 | /** |
| 1052 | * pci_dev_get - increments the reference count of the pci device structure |
| 1053 | * @dev: the device being referenced |
| 1054 | * |
| 1055 | * Each live reference to a device should be refcounted. |
| 1056 | * |
| 1057 | * Drivers for PCI devices should normally record such references in |
| 1058 | * their probe() methods, when they bind to a device, and release |
| 1059 | * them by calling pci_dev_put(), in their disconnect() methods. |
| 1060 | * |
| 1061 | * A pointer to the device with the incremented reference counter is returned. |
| 1062 | */ |
| 1063 | struct pci_dev *pci_dev_get(struct pci_dev *dev) |
| 1064 | { |
| 1065 | if (dev) |
| 1066 | get_device(&dev->dev); |
| 1067 | return dev; |
| 1068 | } |
| 1069 | |
| 1070 | /** |
| 1071 | * pci_dev_put - release a use of the pci device structure |
| 1072 | * @dev: device that's been disconnected |
| 1073 | * |
| 1074 | * Must be called when a user of a device is finished with it. When the last |
| 1075 | * user of the device calls this function, the memory of the device is freed. |
| 1076 | */ |
| 1077 | void pci_dev_put(struct pci_dev *dev) |
| 1078 | { |
| 1079 | if (dev) |
| 1080 | put_device(&dev->dev); |
| 1081 | } |
| 1082 | |
| 1083 | #ifndef CONFIG_HOTPLUG |
| 1084 | int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 1085 | { |
| 1086 | return -ENODEV; |
| 1087 | } |
| 1088 | #endif |
| 1089 | |
| 1090 | struct bus_type pci_bus_type = { |
| 1091 | .name = "pci", |
| 1092 | .match = pci_bus_match, |
| 1093 | .uevent = pci_uevent, |
| 1094 | .probe = pci_device_probe, |
| 1095 | .remove = pci_device_remove, |
| 1096 | .shutdown = pci_device_shutdown, |
| 1097 | .dev_attrs = pci_dev_attrs, |
| 1098 | .bus_attrs = pci_bus_attrs, |
| 1099 | .pm = PCI_PM_OPS_PTR, |
| 1100 | }; |
| 1101 | |
| 1102 | static int __init pci_driver_init(void) |
| 1103 | { |
| 1104 | return bus_register(&pci_bus_type); |
| 1105 | } |
| 1106 | |
| 1107 | postcore_initcall(pci_driver_init); |
| 1108 | |
| 1109 | EXPORT_SYMBOL(pci_match_id); |
| 1110 | EXPORT_SYMBOL(__pci_register_driver); |
| 1111 | EXPORT_SYMBOL(pci_unregister_driver); |
| 1112 | EXPORT_SYMBOL(pci_dev_driver); |
| 1113 | EXPORT_SYMBOL(pci_bus_type); |
| 1114 | EXPORT_SYMBOL(pci_dev_get); |
| 1115 | EXPORT_SYMBOL(pci_dev_put); |