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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 | /* | |
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); |