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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 | struct pci_dynid { |
23 | struct list_head node; |
24 | struct pci_device_id id; |
25 | }; |
26 | |
27 | /** |
28 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices |
29 | * @drv: target pci driver |
30 | * @vendor: PCI vendor ID |
31 | * @device: PCI device ID |
32 | * @subvendor: PCI subvendor ID |
33 | * @subdevice: PCI subdevice ID |
34 | * @class: PCI class |
35 | * @class_mask: PCI class mask |
36 | * @driver_data: private driver data |
37 | * |
38 | * Adds a new dynamic pci device ID to this driver and causes the |
39 | * driver to probe for all devices again. @drv must have been |
40 | * registered prior to calling this function. |
41 | * |
42 | * CONTEXT: |
43 | * Does GFP_KERNEL allocation. |
44 | * |
45 | * RETURNS: |
46 | * 0 on success, -errno on failure. |
47 | */ |
48 | int pci_add_dynid(struct pci_driver *drv, |
49 | unsigned int vendor, unsigned int device, |
50 | unsigned int subvendor, unsigned int subdevice, |
51 | unsigned int class, unsigned int class_mask, |
52 | unsigned long driver_data) |
53 | { |
54 | struct pci_dynid *dynid; |
55 | int retval; |
56 | |
57 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
58 | if (!dynid) |
59 | return -ENOMEM; |
60 | |
61 | dynid->id.vendor = vendor; |
62 | dynid->id.device = device; |
63 | dynid->id.subvendor = subvendor; |
64 | dynid->id.subdevice = subdevice; |
65 | dynid->id.class = class; |
66 | dynid->id.class_mask = class_mask; |
67 | dynid->id.driver_data = driver_data; |
68 | |
69 | spin_lock(&drv->dynids.lock); |
70 | list_add_tail(&dynid->node, &drv->dynids.list); |
71 | spin_unlock(&drv->dynids.lock); |
72 | |
73 | get_driver(&drv->driver); |
74 | retval = driver_attach(&drv->driver); |
75 | put_driver(&drv->driver); |
76 | |
77 | return retval; |
78 | } |
79 | |
80 | static void pci_free_dynids(struct pci_driver *drv) |
81 | { |
82 | struct pci_dynid *dynid, *n; |
83 | |
84 | spin_lock(&drv->dynids.lock); |
85 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { |
86 | list_del(&dynid->node); |
87 | kfree(dynid); |
88 | } |
89 | spin_unlock(&drv->dynids.lock); |
90 | } |
91 | |
92 | /* |
93 | * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG |
94 | */ |
95 | #ifdef CONFIG_HOTPLUG |
96 | /** |
97 | * store_new_id - sysfs frontend to pci_add_dynid() |
98 | * @driver: target device driver |
99 | * @buf: buffer for scanning device ID data |
100 | * @count: input size |
101 | * |
102 | * Allow PCI IDs to be added to an existing driver via sysfs. |
103 | */ |
104 | static ssize_t |
105 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
106 | { |
107 | struct pci_driver *pdrv = to_pci_driver(driver); |
108 | const struct pci_device_id *ids = pdrv->id_table; |
109 | __u32 vendor, device, subvendor=PCI_ANY_ID, |
110 | subdevice=PCI_ANY_ID, class=0, class_mask=0; |
111 | unsigned long driver_data=0; |
112 | int fields=0; |
113 | int retval; |
114 | |
115 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
116 | &vendor, &device, &subvendor, &subdevice, |
117 | &class, &class_mask, &driver_data); |
118 | if (fields < 2) |
119 | return -EINVAL; |
120 | |
121 | /* Only accept driver_data values that match an existing id_table |
122 | entry */ |
123 | if (ids) { |
124 | retval = -EINVAL; |
125 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
126 | if (driver_data == ids->driver_data) { |
127 | retval = 0; |
128 | break; |
129 | } |
130 | ids++; |
131 | } |
132 | if (retval) /* No match */ |
133 | return retval; |
134 | } |
135 | |
136 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
137 | class, class_mask, driver_data); |
138 | if (retval) |
139 | return retval; |
140 | return count; |
141 | } |
142 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
143 | |
144 | /** |
145 | * store_remove_id - remove a PCI device ID from this driver |
146 | * @driver: target device driver |
147 | * @buf: buffer for scanning device ID data |
148 | * @count: input size |
149 | * |
150 | * Removes a dynamic pci device ID to this driver. |
151 | */ |
152 | static ssize_t |
153 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) |
154 | { |
155 | struct pci_dynid *dynid, *n; |
156 | struct pci_driver *pdrv = to_pci_driver(driver); |
157 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
158 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; |
159 | int fields = 0; |
160 | int retval = -ENODEV; |
161 | |
162 | fields = sscanf(buf, "%x %x %x %x %x %x", |
163 | &vendor, &device, &subvendor, &subdevice, |
164 | &class, &class_mask); |
165 | if (fields < 2) |
166 | return -EINVAL; |
167 | |
168 | spin_lock(&pdrv->dynids.lock); |
169 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { |
170 | struct pci_device_id *id = &dynid->id; |
171 | if ((id->vendor == vendor) && |
172 | (id->device == device) && |
173 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && |
174 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && |
175 | !((id->class ^ class) & class_mask)) { |
176 | list_del(&dynid->node); |
177 | kfree(dynid); |
178 | retval = 0; |
179 | break; |
180 | } |
181 | } |
182 | spin_unlock(&pdrv->dynids.lock); |
183 | |
184 | if (retval) |
185 | return retval; |
186 | return count; |
187 | } |
188 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
189 | |
190 | static int |
191 | pci_create_newid_file(struct pci_driver *drv) |
192 | { |
193 | int error = 0; |
194 | if (drv->probe != NULL) |
195 | error = driver_create_file(&drv->driver, &driver_attr_new_id); |
196 | return error; |
197 | } |
198 | |
199 | static void pci_remove_newid_file(struct pci_driver *drv) |
200 | { |
201 | driver_remove_file(&drv->driver, &driver_attr_new_id); |
202 | } |
203 | |
204 | static int |
205 | pci_create_removeid_file(struct pci_driver *drv) |
206 | { |
207 | int error = 0; |
208 | if (drv->probe != NULL) |
209 | error = driver_create_file(&drv->driver,&driver_attr_remove_id); |
210 | return error; |
211 | } |
212 | |
213 | static void pci_remove_removeid_file(struct pci_driver *drv) |
214 | { |
215 | driver_remove_file(&drv->driver, &driver_attr_remove_id); |
216 | } |
217 | #else /* !CONFIG_HOTPLUG */ |
218 | static inline int pci_create_newid_file(struct pci_driver *drv) |
219 | { |
220 | return 0; |
221 | } |
222 | static inline void pci_remove_newid_file(struct pci_driver *drv) {} |
223 | static inline int pci_create_removeid_file(struct pci_driver *drv) |
224 | { |
225 | return 0; |
226 | } |
227 | static inline void pci_remove_removeid_file(struct pci_driver *drv) {} |
228 | #endif |
229 | |
230 | /** |
231 | * pci_match_id - See if a pci device matches a given pci_id table |
232 | * @ids: array of PCI device id structures to search in |
233 | * @dev: the PCI device structure to match against. |
234 | * |
235 | * Used by a driver to check whether a PCI device present in the |
236 | * system is in its list of supported devices. Returns the matching |
237 | * pci_device_id structure or %NULL if there is no match. |
238 | * |
239 | * Deprecated, don't use this as it will not catch any dynamic ids |
240 | * that a driver might want to check for. |
241 | */ |
242 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
243 | struct pci_dev *dev) |
244 | { |
245 | if (ids) { |
246 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
247 | if (pci_match_one_device(ids, dev)) |
248 | return ids; |
249 | ids++; |
250 | } |
251 | } |
252 | return NULL; |
253 | } |
254 | |
255 | /** |
256 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
257 | * @drv: the PCI driver to match against |
258 | * @dev: the PCI device structure to match against |
259 | * |
260 | * Used by a driver to check whether a PCI device present in the |
261 | * system is in its list of supported devices. Returns the matching |
262 | * pci_device_id structure or %NULL if there is no match. |
263 | */ |
264 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
265 | struct pci_dev *dev) |
266 | { |
267 | struct pci_dynid *dynid; |
268 | |
269 | /* Look at the dynamic ids first, before the static ones */ |
270 | spin_lock(&drv->dynids.lock); |
271 | list_for_each_entry(dynid, &drv->dynids.list, node) { |
272 | if (pci_match_one_device(&dynid->id, dev)) { |
273 | spin_unlock(&drv->dynids.lock); |
274 | return &dynid->id; |
275 | } |
276 | } |
277 | spin_unlock(&drv->dynids.lock); |
278 | |
279 | return pci_match_id(drv->id_table, dev); |
280 | } |
281 | |
282 | struct drv_dev_and_id { |
283 | struct pci_driver *drv; |
284 | struct pci_dev *dev; |
285 | const struct pci_device_id *id; |
286 | }; |
287 | |
288 | static long local_pci_probe(void *_ddi) |
289 | { |
290 | struct drv_dev_and_id *ddi = _ddi; |
291 | |
292 | return ddi->drv->probe(ddi->dev, ddi->id); |
293 | } |
294 | |
295 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
296 | const struct pci_device_id *id) |
297 | { |
298 | int error, node; |
299 | struct drv_dev_and_id ddi = { drv, dev, id }; |
300 | |
301 | /* Execute driver initialization on node where the device's |
302 | bus is attached to. This way the driver likely allocates |
303 | its local memory on the right node without any need to |
304 | change it. */ |
305 | node = dev_to_node(&dev->dev); |
306 | if (node >= 0) { |
307 | int cpu; |
308 | |
309 | get_online_cpus(); |
310 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
311 | if (cpu < nr_cpu_ids) |
312 | error = work_on_cpu(cpu, local_pci_probe, &ddi); |
313 | else |
314 | error = local_pci_probe(&ddi); |
315 | put_online_cpus(); |
316 | } else |
317 | error = local_pci_probe(&ddi); |
318 | return error; |
319 | } |
320 | |
321 | /** |
322 | * __pci_device_probe() |
323 | * @drv: driver to call to check if it wants the PCI device |
324 | * @pci_dev: PCI device being probed |
325 | * |
326 | * returns 0 on success, else error. |
327 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
328 | */ |
329 | static int |
330 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
331 | { |
332 | const struct pci_device_id *id; |
333 | int error = 0; |
334 | |
335 | if (!pci_dev->driver && drv->probe) { |
336 | error = -ENODEV; |
337 | |
338 | id = pci_match_device(drv, pci_dev); |
339 | if (id) |
340 | error = pci_call_probe(drv, pci_dev, id); |
341 | if (error >= 0) { |
342 | pci_dev->driver = drv; |
343 | error = 0; |
344 | } |
345 | } |
346 | return error; |
347 | } |
348 | |
349 | static int pci_device_probe(struct device * dev) |
350 | { |
351 | int error = 0; |
352 | struct pci_driver *drv; |
353 | struct pci_dev *pci_dev; |
354 | |
355 | drv = to_pci_driver(dev->driver); |
356 | pci_dev = to_pci_dev(dev); |
357 | pci_dev_get(pci_dev); |
358 | error = __pci_device_probe(drv, pci_dev); |
359 | if (error) |
360 | pci_dev_put(pci_dev); |
361 | |
362 | return error; |
363 | } |
364 | |
365 | static int pci_device_remove(struct device * dev) |
366 | { |
367 | struct pci_dev * pci_dev = to_pci_dev(dev); |
368 | struct pci_driver * drv = pci_dev->driver; |
369 | |
370 | if (drv) { |
371 | if (drv->remove) |
372 | drv->remove(pci_dev); |
373 | pci_dev->driver = NULL; |
374 | } |
375 | |
376 | /* |
377 | * If the device is still on, set the power state as "unknown", |
378 | * since it might change by the next time we load the driver. |
379 | */ |
380 | if (pci_dev->current_state == PCI_D0) |
381 | pci_dev->current_state = PCI_UNKNOWN; |
382 | |
383 | /* |
384 | * We would love to complain here if pci_dev->is_enabled is set, that |
385 | * the driver should have called pci_disable_device(), but the |
386 | * unfortunate fact is there are too many odd BIOS and bridge setups |
387 | * that don't like drivers doing that all of the time. |
388 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
389 | * horrible the crap we have to deal with is when we are awake... |
390 | */ |
391 | |
392 | pci_dev_put(pci_dev); |
393 | return 0; |
394 | } |
395 | |
396 | static void pci_device_shutdown(struct device *dev) |
397 | { |
398 | struct pci_dev *pci_dev = to_pci_dev(dev); |
399 | struct pci_driver *drv = pci_dev->driver; |
400 | |
401 | if (drv && drv->shutdown) |
402 | drv->shutdown(pci_dev); |
403 | pci_msi_shutdown(pci_dev); |
404 | pci_msix_shutdown(pci_dev); |
405 | } |
406 | |
407 | #ifdef CONFIG_PM_SLEEP |
408 | |
409 | /* |
410 | * Default "suspend" method for devices that have no driver provided suspend, |
411 | * or not even a driver at all (second part). |
412 | */ |
413 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
414 | { |
415 | /* |
416 | * mark its power state as "unknown", since we don't know if |
417 | * e.g. the BIOS will change its device state when we suspend. |
418 | */ |
419 | if (pci_dev->current_state == PCI_D0) |
420 | pci_dev->current_state = PCI_UNKNOWN; |
421 | } |
422 | |
423 | /* |
424 | * Default "resume" method for devices that have no driver provided resume, |
425 | * or not even a driver at all (second part). |
426 | */ |
427 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
428 | { |
429 | int retval; |
430 | |
431 | /* if the device was enabled before suspend, reenable */ |
432 | retval = pci_reenable_device(pci_dev); |
433 | /* |
434 | * if the device was busmaster before the suspend, make it busmaster |
435 | * again |
436 | */ |
437 | if (pci_dev->is_busmaster) |
438 | pci_set_master(pci_dev); |
439 | |
440 | return retval; |
441 | } |
442 | |
443 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) |
444 | { |
445 | struct pci_dev * pci_dev = to_pci_dev(dev); |
446 | struct pci_driver * drv = pci_dev->driver; |
447 | |
448 | if (drv && drv->suspend) { |
449 | pci_power_t prev = pci_dev->current_state; |
450 | int error; |
451 | |
452 | error = drv->suspend(pci_dev, state); |
453 | suspend_report_result(drv->suspend, error); |
454 | if (error) |
455 | return error; |
456 | |
457 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
458 | && pci_dev->current_state != PCI_UNKNOWN) { |
459 | WARN_ONCE(pci_dev->current_state != prev, |
460 | "PCI PM: Device state not saved by %pF\n", |
461 | drv->suspend); |
462 | } |
463 | } |
464 | |
465 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
466 | |
467 | return 0; |
468 | } |
469 | |
470 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
471 | { |
472 | struct pci_dev * pci_dev = to_pci_dev(dev); |
473 | struct pci_driver * drv = pci_dev->driver; |
474 | |
475 | if (drv && drv->suspend_late) { |
476 | pci_power_t prev = pci_dev->current_state; |
477 | int error; |
478 | |
479 | error = drv->suspend_late(pci_dev, state); |
480 | suspend_report_result(drv->suspend_late, error); |
481 | if (error) |
482 | return error; |
483 | |
484 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
485 | && pci_dev->current_state != PCI_UNKNOWN) { |
486 | WARN_ONCE(pci_dev->current_state != prev, |
487 | "PCI PM: Device state not saved by %pF\n", |
488 | drv->suspend_late); |
489 | return 0; |
490 | } |
491 | } |
492 | |
493 | if (!pci_dev->state_saved) |
494 | pci_save_state(pci_dev); |
495 | |
496 | pci_pm_set_unknown_state(pci_dev); |
497 | |
498 | return 0; |
499 | } |
500 | |
501 | static int pci_legacy_resume_early(struct device *dev) |
502 | { |
503 | struct pci_dev * pci_dev = to_pci_dev(dev); |
504 | struct pci_driver * drv = pci_dev->driver; |
505 | |
506 | return drv && drv->resume_early ? |
507 | drv->resume_early(pci_dev) : 0; |
508 | } |
509 | |
510 | static int pci_legacy_resume(struct device *dev) |
511 | { |
512 | struct pci_dev * pci_dev = to_pci_dev(dev); |
513 | struct pci_driver * drv = pci_dev->driver; |
514 | |
515 | pci_fixup_device(pci_fixup_resume, pci_dev); |
516 | |
517 | return drv && drv->resume ? |
518 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); |
519 | } |
520 | |
521 | /* Auxiliary functions used by the new power management framework */ |
522 | |
523 | /** |
524 | * pci_restore_standard_config - restore standard config registers of PCI device |
525 | * @pci_dev: PCI device to handle |
526 | */ |
527 | static int pci_restore_standard_config(struct pci_dev *pci_dev) |
528 | { |
529 | pci_update_current_state(pci_dev, PCI_UNKNOWN); |
530 | |
531 | if (pci_dev->current_state != PCI_D0) { |
532 | int error = pci_set_power_state(pci_dev, PCI_D0); |
533 | if (error) |
534 | return error; |
535 | } |
536 | |
537 | return pci_restore_state(pci_dev); |
538 | } |
539 | |
540 | static void pci_pm_default_resume_noirq(struct pci_dev *pci_dev) |
541 | { |
542 | pci_restore_standard_config(pci_dev); |
543 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
544 | } |
545 | |
546 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
547 | { |
548 | pci_fixup_device(pci_fixup_resume, pci_dev); |
549 | |
550 | if (!pci_is_bridge(pci_dev)) |
551 | pci_enable_wake(pci_dev, PCI_D0, false); |
552 | } |
553 | |
554 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
555 | { |
556 | /* Disable non-bridge devices without PM support */ |
557 | if (!pci_is_bridge(pci_dev)) |
558 | pci_disable_enabled_device(pci_dev); |
559 | } |
560 | |
561 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
562 | { |
563 | struct pci_driver *drv = pci_dev->driver; |
564 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
565 | || drv->resume_early); |
566 | |
567 | /* |
568 | * Legacy PM support is used by default, so warn if the new framework is |
569 | * supported as well. Drivers are supposed to support either the |
570 | * former, or the latter, but not both at the same time. |
571 | */ |
572 | WARN_ON(ret && drv->driver.pm); |
573 | |
574 | return ret; |
575 | } |
576 | |
577 | /* New power management framework */ |
578 | |
579 | static int pci_pm_prepare(struct device *dev) |
580 | { |
581 | struct device_driver *drv = dev->driver; |
582 | int error = 0; |
583 | |
584 | if (drv && drv->pm && drv->pm->prepare) |
585 | error = drv->pm->prepare(dev); |
586 | |
587 | return error; |
588 | } |
589 | |
590 | static void pci_pm_complete(struct device *dev) |
591 | { |
592 | struct device_driver *drv = dev->driver; |
593 | |
594 | if (drv && drv->pm && drv->pm->complete) |
595 | drv->pm->complete(dev); |
596 | } |
597 | |
598 | #ifdef CONFIG_SUSPEND |
599 | |
600 | static int pci_pm_suspend(struct device *dev) |
601 | { |
602 | struct pci_dev *pci_dev = to_pci_dev(dev); |
603 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
604 | |
605 | if (pci_has_legacy_pm_support(pci_dev)) |
606 | return pci_legacy_suspend(dev, PMSG_SUSPEND); |
607 | |
608 | if (!pm) { |
609 | pci_pm_default_suspend(pci_dev); |
610 | goto Fixup; |
611 | } |
612 | |
613 | if (pm->suspend) { |
614 | pci_power_t prev = pci_dev->current_state; |
615 | int error; |
616 | |
617 | error = pm->suspend(dev); |
618 | suspend_report_result(pm->suspend, error); |
619 | if (error) |
620 | return error; |
621 | |
622 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
623 | && pci_dev->current_state != PCI_UNKNOWN) { |
624 | WARN_ONCE(pci_dev->current_state != prev, |
625 | "PCI PM: State of device not saved by %pF\n", |
626 | pm->suspend); |
627 | } |
628 | } |
629 | |
630 | Fixup: |
631 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
632 | |
633 | return 0; |
634 | } |
635 | |
636 | static int pci_pm_suspend_noirq(struct device *dev) |
637 | { |
638 | struct pci_dev *pci_dev = to_pci_dev(dev); |
639 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
640 | |
641 | if (pci_has_legacy_pm_support(pci_dev)) |
642 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); |
643 | |
644 | if (!pm) { |
645 | pci_save_state(pci_dev); |
646 | return 0; |
647 | } |
648 | |
649 | if (pm->suspend_noirq) { |
650 | pci_power_t prev = pci_dev->current_state; |
651 | int error; |
652 | |
653 | error = pm->suspend_noirq(dev); |
654 | suspend_report_result(pm->suspend_noirq, error); |
655 | if (error) |
656 | return error; |
657 | |
658 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
659 | && pci_dev->current_state != PCI_UNKNOWN) { |
660 | WARN_ONCE(pci_dev->current_state != prev, |
661 | "PCI PM: State of device not saved by %pF\n", |
662 | pm->suspend_noirq); |
663 | return 0; |
664 | } |
665 | } |
666 | |
667 | if (!pci_dev->state_saved) { |
668 | pci_save_state(pci_dev); |
669 | if (!pci_is_bridge(pci_dev)) |
670 | pci_prepare_to_sleep(pci_dev); |
671 | } |
672 | |
673 | pci_pm_set_unknown_state(pci_dev); |
674 | |
675 | return 0; |
676 | } |
677 | |
678 | static int pci_pm_resume_noirq(struct device *dev) |
679 | { |
680 | struct pci_dev *pci_dev = to_pci_dev(dev); |
681 | struct device_driver *drv = dev->driver; |
682 | int error = 0; |
683 | |
684 | pci_pm_default_resume_noirq(pci_dev); |
685 | |
686 | if (pci_has_legacy_pm_support(pci_dev)) |
687 | return pci_legacy_resume_early(dev); |
688 | |
689 | if (drv && drv->pm && drv->pm->resume_noirq) |
690 | error = drv->pm->resume_noirq(dev); |
691 | |
692 | return error; |
693 | } |
694 | |
695 | static int pci_pm_resume(struct device *dev) |
696 | { |
697 | struct pci_dev *pci_dev = to_pci_dev(dev); |
698 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
699 | int error = 0; |
700 | |
701 | /* |
702 | * This is necessary for the suspend error path in which resume is |
703 | * called without restoring the standard config registers of the device. |
704 | */ |
705 | if (pci_dev->state_saved) |
706 | pci_restore_standard_config(pci_dev); |
707 | |
708 | if (pci_has_legacy_pm_support(pci_dev)) |
709 | return pci_legacy_resume(dev); |
710 | |
711 | pci_pm_default_resume(pci_dev); |
712 | |
713 | if (pm) { |
714 | if (pm->resume) |
715 | error = pm->resume(dev); |
716 | } else { |
717 | pci_pm_reenable_device(pci_dev); |
718 | } |
719 | |
720 | return error; |
721 | } |
722 | |
723 | #else /* !CONFIG_SUSPEND */ |
724 | |
725 | #define pci_pm_suspend NULL |
726 | #define pci_pm_suspend_noirq NULL |
727 | #define pci_pm_resume NULL |
728 | #define pci_pm_resume_noirq NULL |
729 | |
730 | #endif /* !CONFIG_SUSPEND */ |
731 | |
732 | #ifdef CONFIG_HIBERNATION |
733 | |
734 | static int pci_pm_freeze(struct device *dev) |
735 | { |
736 | struct pci_dev *pci_dev = to_pci_dev(dev); |
737 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
738 | |
739 | if (pci_has_legacy_pm_support(pci_dev)) |
740 | return pci_legacy_suspend(dev, PMSG_FREEZE); |
741 | |
742 | if (!pm) { |
743 | pci_pm_default_suspend(pci_dev); |
744 | return 0; |
745 | } |
746 | |
747 | if (pm->freeze) { |
748 | int error; |
749 | |
750 | error = pm->freeze(dev); |
751 | suspend_report_result(pm->freeze, error); |
752 | if (error) |
753 | return error; |
754 | } |
755 | |
756 | return 0; |
757 | } |
758 | |
759 | static int pci_pm_freeze_noirq(struct device *dev) |
760 | { |
761 | struct pci_dev *pci_dev = to_pci_dev(dev); |
762 | struct device_driver *drv = dev->driver; |
763 | |
764 | if (pci_has_legacy_pm_support(pci_dev)) |
765 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); |
766 | |
767 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
768 | int error; |
769 | |
770 | error = drv->pm->freeze_noirq(dev); |
771 | suspend_report_result(drv->pm->freeze_noirq, error); |
772 | if (error) |
773 | return error; |
774 | } |
775 | |
776 | if (!pci_dev->state_saved) |
777 | pci_save_state(pci_dev); |
778 | |
779 | pci_pm_set_unknown_state(pci_dev); |
780 | |
781 | return 0; |
782 | } |
783 | |
784 | static int pci_pm_thaw_noirq(struct device *dev) |
785 | { |
786 | struct pci_dev *pci_dev = to_pci_dev(dev); |
787 | struct device_driver *drv = dev->driver; |
788 | int error = 0; |
789 | |
790 | if (pci_has_legacy_pm_support(pci_dev)) |
791 | return pci_legacy_resume_early(dev); |
792 | |
793 | pci_update_current_state(pci_dev, PCI_D0); |
794 | |
795 | if (drv && drv->pm && drv->pm->thaw_noirq) |
796 | error = drv->pm->thaw_noirq(dev); |
797 | |
798 | return error; |
799 | } |
800 | |
801 | static int pci_pm_thaw(struct device *dev) |
802 | { |
803 | struct pci_dev *pci_dev = to_pci_dev(dev); |
804 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
805 | int error = 0; |
806 | |
807 | if (pci_has_legacy_pm_support(pci_dev)) |
808 | return pci_legacy_resume(dev); |
809 | |
810 | if (pm) { |
811 | if (pm->thaw) |
812 | error = pm->thaw(dev); |
813 | } else { |
814 | pci_pm_reenable_device(pci_dev); |
815 | } |
816 | |
817 | pci_dev->state_saved = false; |
818 | |
819 | return error; |
820 | } |
821 | |
822 | static int pci_pm_poweroff(struct device *dev) |
823 | { |
824 | struct pci_dev *pci_dev = to_pci_dev(dev); |
825 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
826 | |
827 | if (pci_has_legacy_pm_support(pci_dev)) |
828 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); |
829 | |
830 | if (!pm) { |
831 | pci_pm_default_suspend(pci_dev); |
832 | goto Fixup; |
833 | } |
834 | |
835 | if (pm->poweroff) { |
836 | int error; |
837 | |
838 | error = pm->poweroff(dev); |
839 | suspend_report_result(pm->poweroff, error); |
840 | if (error) |
841 | return error; |
842 | } |
843 | |
844 | Fixup: |
845 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
846 | |
847 | return 0; |
848 | } |
849 | |
850 | static int pci_pm_poweroff_noirq(struct device *dev) |
851 | { |
852 | struct pci_dev *pci_dev = to_pci_dev(dev); |
853 | struct device_driver *drv = dev->driver; |
854 | |
855 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
856 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); |
857 | |
858 | if (!drv || !drv->pm) |
859 | return 0; |
860 | |
861 | if (drv->pm->poweroff_noirq) { |
862 | int error; |
863 | |
864 | error = drv->pm->poweroff_noirq(dev); |
865 | suspend_report_result(drv->pm->poweroff_noirq, error); |
866 | if (error) |
867 | return error; |
868 | } |
869 | |
870 | if (!pci_dev->state_saved && !pci_is_bridge(pci_dev)) |
871 | pci_prepare_to_sleep(pci_dev); |
872 | |
873 | return 0; |
874 | } |
875 | |
876 | static int pci_pm_restore_noirq(struct device *dev) |
877 | { |
878 | struct pci_dev *pci_dev = to_pci_dev(dev); |
879 | struct device_driver *drv = dev->driver; |
880 | int error = 0; |
881 | |
882 | pci_pm_default_resume_noirq(pci_dev); |
883 | |
884 | if (pci_has_legacy_pm_support(pci_dev)) |
885 | return pci_legacy_resume_early(dev); |
886 | |
887 | if (drv && drv->pm && drv->pm->restore_noirq) |
888 | error = drv->pm->restore_noirq(dev); |
889 | |
890 | return error; |
891 | } |
892 | |
893 | static int pci_pm_restore(struct device *dev) |
894 | { |
895 | struct pci_dev *pci_dev = to_pci_dev(dev); |
896 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
897 | int error = 0; |
898 | |
899 | /* |
900 | * This is necessary for the hibernation error path in which restore is |
901 | * called without restoring the standard config registers of the device. |
902 | */ |
903 | if (pci_dev->state_saved) |
904 | pci_restore_standard_config(pci_dev); |
905 | |
906 | if (pci_has_legacy_pm_support(pci_dev)) |
907 | return pci_legacy_resume(dev); |
908 | |
909 | pci_pm_default_resume(pci_dev); |
910 | |
911 | if (pm) { |
912 | if (pm->restore) |
913 | error = pm->restore(dev); |
914 | } else { |
915 | pci_pm_reenable_device(pci_dev); |
916 | } |
917 | |
918 | return error; |
919 | } |
920 | |
921 | #else /* !CONFIG_HIBERNATION */ |
922 | |
923 | #define pci_pm_freeze NULL |
924 | #define pci_pm_freeze_noirq NULL |
925 | #define pci_pm_thaw NULL |
926 | #define pci_pm_thaw_noirq NULL |
927 | #define pci_pm_poweroff NULL |
928 | #define pci_pm_poweroff_noirq NULL |
929 | #define pci_pm_restore NULL |
930 | #define pci_pm_restore_noirq NULL |
931 | |
932 | #endif /* !CONFIG_HIBERNATION */ |
933 | |
934 | const struct dev_pm_ops pci_dev_pm_ops = { |
935 | .prepare = pci_pm_prepare, |
936 | .complete = pci_pm_complete, |
937 | .suspend = pci_pm_suspend, |
938 | .resume = pci_pm_resume, |
939 | .freeze = pci_pm_freeze, |
940 | .thaw = pci_pm_thaw, |
941 | .poweroff = pci_pm_poweroff, |
942 | .restore = pci_pm_restore, |
943 | .suspend_noirq = pci_pm_suspend_noirq, |
944 | .resume_noirq = pci_pm_resume_noirq, |
945 | .freeze_noirq = pci_pm_freeze_noirq, |
946 | .thaw_noirq = pci_pm_thaw_noirq, |
947 | .poweroff_noirq = pci_pm_poweroff_noirq, |
948 | .restore_noirq = pci_pm_restore_noirq, |
949 | }; |
950 | |
951 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
952 | |
953 | #else /* !CONFIG_PM_SLEEP */ |
954 | |
955 | #define PCI_PM_OPS_PTR NULL |
956 | |
957 | #endif /* !CONFIG_PM_SLEEP */ |
958 | |
959 | /** |
960 | * __pci_register_driver - register a new pci driver |
961 | * @drv: the driver structure to register |
962 | * @owner: owner module of drv |
963 | * @mod_name: module name string |
964 | * |
965 | * Adds the driver structure to the list of registered drivers. |
966 | * Returns a negative value on error, otherwise 0. |
967 | * If no error occurred, the driver remains registered even if |
968 | * no device was claimed during registration. |
969 | */ |
970 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
971 | const char *mod_name) |
972 | { |
973 | int error; |
974 | |
975 | /* initialize common driver fields */ |
976 | drv->driver.name = drv->name; |
977 | drv->driver.bus = &pci_bus_type; |
978 | drv->driver.owner = owner; |
979 | drv->driver.mod_name = mod_name; |
980 | |
981 | spin_lock_init(&drv->dynids.lock); |
982 | INIT_LIST_HEAD(&drv->dynids.list); |
983 | |
984 | /* register with core */ |
985 | error = driver_register(&drv->driver); |
986 | if (error) |
987 | goto out; |
988 | |
989 | error = pci_create_newid_file(drv); |
990 | if (error) |
991 | goto out_newid; |
992 | |
993 | error = pci_create_removeid_file(drv); |
994 | if (error) |
995 | goto out_removeid; |
996 | out: |
997 | return error; |
998 | |
999 | out_removeid: |
1000 | pci_remove_newid_file(drv); |
1001 | out_newid: |
1002 | driver_unregister(&drv->driver); |
1003 | goto out; |
1004 | } |
1005 | |
1006 | /** |
1007 | * pci_unregister_driver - unregister a pci driver |
1008 | * @drv: the driver structure to unregister |
1009 | * |
1010 | * Deletes the driver structure from the list of registered PCI drivers, |
1011 | * gives it a chance to clean up by calling its remove() function for |
1012 | * each device it was responsible for, and marks those devices as |
1013 | * driverless. |
1014 | */ |
1015 | |
1016 | void |
1017 | pci_unregister_driver(struct pci_driver *drv) |
1018 | { |
1019 | pci_remove_removeid_file(drv); |
1020 | pci_remove_newid_file(drv); |
1021 | driver_unregister(&drv->driver); |
1022 | pci_free_dynids(drv); |
1023 | } |
1024 | |
1025 | static struct pci_driver pci_compat_driver = { |
1026 | .name = "compat" |
1027 | }; |
1028 | |
1029 | /** |
1030 | * pci_dev_driver - get the pci_driver of a device |
1031 | * @dev: the device to query |
1032 | * |
1033 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1034 | * registered driver for the device. |
1035 | */ |
1036 | struct pci_driver * |
1037 | pci_dev_driver(const struct pci_dev *dev) |
1038 | { |
1039 | if (dev->driver) |
1040 | return dev->driver; |
1041 | else { |
1042 | int i; |
1043 | for(i=0; i<=PCI_ROM_RESOURCE; i++) |
1044 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1045 | return &pci_compat_driver; |
1046 | } |
1047 | return NULL; |
1048 | } |
1049 | |
1050 | /** |
1051 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure |
1052 | * @dev: the PCI device structure to match against |
1053 | * @drv: the device driver to search for matching PCI device id structures |
1054 | * |
1055 | * Used by a driver to check whether a PCI device present in the |
1056 | * system is in its list of supported devices. Returns the matching |
1057 | * pci_device_id structure or %NULL if there is no match. |
1058 | */ |
1059 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1060 | { |
1061 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1062 | struct pci_driver *pci_drv = to_pci_driver(drv); |
1063 | const struct pci_device_id *found_id; |
1064 | |
1065 | found_id = pci_match_device(pci_drv, pci_dev); |
1066 | if (found_id) |
1067 | return 1; |
1068 | |
1069 | return 0; |
1070 | } |
1071 | |
1072 | /** |
1073 | * pci_dev_get - increments the reference count of the pci device structure |
1074 | * @dev: the device being referenced |
1075 | * |
1076 | * Each live reference to a device should be refcounted. |
1077 | * |
1078 | * Drivers for PCI devices should normally record such references in |
1079 | * their probe() methods, when they bind to a device, and release |
1080 | * them by calling pci_dev_put(), in their disconnect() methods. |
1081 | * |
1082 | * A pointer to the device with the incremented reference counter is returned. |
1083 | */ |
1084 | struct pci_dev *pci_dev_get(struct pci_dev *dev) |
1085 | { |
1086 | if (dev) |
1087 | get_device(&dev->dev); |
1088 | return dev; |
1089 | } |
1090 | |
1091 | /** |
1092 | * pci_dev_put - release a use of the pci device structure |
1093 | * @dev: device that's been disconnected |
1094 | * |
1095 | * Must be called when a user of a device is finished with it. When the last |
1096 | * user of the device calls this function, the memory of the device is freed. |
1097 | */ |
1098 | void pci_dev_put(struct pci_dev *dev) |
1099 | { |
1100 | if (dev) |
1101 | put_device(&dev->dev); |
1102 | } |
1103 | |
1104 | #ifndef CONFIG_HOTPLUG |
1105 | int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1106 | { |
1107 | return -ENODEV; |
1108 | } |
1109 | #endif |
1110 | |
1111 | struct bus_type pci_bus_type = { |
1112 | .name = "pci", |
1113 | .match = pci_bus_match, |
1114 | .uevent = pci_uevent, |
1115 | .probe = pci_device_probe, |
1116 | .remove = pci_device_remove, |
1117 | .shutdown = pci_device_shutdown, |
1118 | .dev_attrs = pci_dev_attrs, |
1119 | .bus_attrs = pci_bus_attrs, |
1120 | .pm = PCI_PM_OPS_PTR, |
1121 | }; |
1122 | |
1123 | static int __init pci_driver_init(void) |
1124 | { |
1125 | return bus_register(&pci_bus_type); |
1126 | } |
1127 | |
1128 | postcore_initcall(pci_driver_init); |
1129 | |
1130 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
1131 | EXPORT_SYMBOL(pci_match_id); |
1132 | EXPORT_SYMBOL(__pci_register_driver); |
1133 | EXPORT_SYMBOL(pci_unregister_driver); |
1134 | EXPORT_SYMBOL(pci_dev_driver); |
1135 | EXPORT_SYMBOL(pci_bus_type); |
1136 | EXPORT_SYMBOL(pci_dev_get); |
1137 | EXPORT_SYMBOL(pci_dev_put); |
1138 |
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