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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 <linux/pm_runtime.h> |
21 | #include "pci.h" |
22 | |
23 | struct pci_dynid { |
24 | struct list_head node; |
25 | struct pci_device_id id; |
26 | }; |
27 | |
28 | /** |
29 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices |
30 | * @drv: target pci driver |
31 | * @vendor: PCI vendor ID |
32 | * @device: PCI device ID |
33 | * @subvendor: PCI subvendor ID |
34 | * @subdevice: PCI subdevice ID |
35 | * @class: PCI class |
36 | * @class_mask: PCI class mask |
37 | * @driver_data: private driver data |
38 | * |
39 | * Adds a new dynamic pci device ID to this driver and causes the |
40 | * driver to probe for all devices again. @drv must have been |
41 | * registered prior to calling this function. |
42 | * |
43 | * CONTEXT: |
44 | * Does GFP_KERNEL allocation. |
45 | * |
46 | * RETURNS: |
47 | * 0 on success, -errno on failure. |
48 | */ |
49 | int pci_add_dynid(struct pci_driver *drv, |
50 | unsigned int vendor, unsigned int device, |
51 | unsigned int subvendor, unsigned int subdevice, |
52 | unsigned int class, unsigned int class_mask, |
53 | unsigned long driver_data) |
54 | { |
55 | struct pci_dynid *dynid; |
56 | int retval; |
57 | |
58 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
59 | if (!dynid) |
60 | return -ENOMEM; |
61 | |
62 | dynid->id.vendor = vendor; |
63 | dynid->id.device = device; |
64 | dynid->id.subvendor = subvendor; |
65 | dynid->id.subdevice = subdevice; |
66 | dynid->id.class = class; |
67 | dynid->id.class_mask = class_mask; |
68 | dynid->id.driver_data = driver_data; |
69 | |
70 | spin_lock(&drv->dynids.lock); |
71 | list_add_tail(&dynid->node, &drv->dynids.list); |
72 | spin_unlock(&drv->dynids.lock); |
73 | |
74 | get_driver(&drv->driver); |
75 | retval = driver_attach(&drv->driver); |
76 | put_driver(&drv->driver); |
77 | |
78 | return retval; |
79 | } |
80 | |
81 | static void pci_free_dynids(struct pci_driver *drv) |
82 | { |
83 | struct pci_dynid *dynid, *n; |
84 | |
85 | spin_lock(&drv->dynids.lock); |
86 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { |
87 | list_del(&dynid->node); |
88 | kfree(dynid); |
89 | } |
90 | spin_unlock(&drv->dynids.lock); |
91 | } |
92 | |
93 | /* |
94 | * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG |
95 | */ |
96 | #ifdef CONFIG_HOTPLUG |
97 | /** |
98 | * store_new_id - sysfs frontend to pci_add_dynid() |
99 | * @driver: target device driver |
100 | * @buf: buffer for scanning device ID data |
101 | * @count: input size |
102 | * |
103 | * Allow PCI IDs to be added to an existing driver via sysfs. |
104 | */ |
105 | static ssize_t |
106 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
107 | { |
108 | struct pci_driver *pdrv = to_pci_driver(driver); |
109 | const struct pci_device_id *ids = pdrv->id_table; |
110 | __u32 vendor, device, subvendor=PCI_ANY_ID, |
111 | subdevice=PCI_ANY_ID, class=0, class_mask=0; |
112 | unsigned long driver_data=0; |
113 | int fields=0; |
114 | int retval; |
115 | |
116 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
117 | &vendor, &device, &subvendor, &subdevice, |
118 | &class, &class_mask, &driver_data); |
119 | if (fields < 2) |
120 | return -EINVAL; |
121 | |
122 | /* Only accept driver_data values that match an existing id_table |
123 | entry */ |
124 | if (ids) { |
125 | retval = -EINVAL; |
126 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
127 | if (driver_data == ids->driver_data) { |
128 | retval = 0; |
129 | break; |
130 | } |
131 | ids++; |
132 | } |
133 | if (retval) /* No match */ |
134 | return retval; |
135 | } |
136 | |
137 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
138 | class, class_mask, driver_data); |
139 | if (retval) |
140 | return retval; |
141 | return count; |
142 | } |
143 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
144 | |
145 | /** |
146 | * store_remove_id - remove a PCI device ID from this driver |
147 | * @driver: target device driver |
148 | * @buf: buffer for scanning device ID data |
149 | * @count: input size |
150 | * |
151 | * Removes a dynamic pci device ID to this driver. |
152 | */ |
153 | static ssize_t |
154 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) |
155 | { |
156 | struct pci_dynid *dynid, *n; |
157 | struct pci_driver *pdrv = to_pci_driver(driver); |
158 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
159 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; |
160 | int fields = 0; |
161 | int retval = -ENODEV; |
162 | |
163 | fields = sscanf(buf, "%x %x %x %x %x %x", |
164 | &vendor, &device, &subvendor, &subdevice, |
165 | &class, &class_mask); |
166 | if (fields < 2) |
167 | return -EINVAL; |
168 | |
169 | spin_lock(&pdrv->dynids.lock); |
170 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { |
171 | struct pci_device_id *id = &dynid->id; |
172 | if ((id->vendor == vendor) && |
173 | (id->device == device) && |
174 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && |
175 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && |
176 | !((id->class ^ class) & class_mask)) { |
177 | list_del(&dynid->node); |
178 | kfree(dynid); |
179 | retval = 0; |
180 | break; |
181 | } |
182 | } |
183 | spin_unlock(&pdrv->dynids.lock); |
184 | |
185 | if (retval) |
186 | return retval; |
187 | return count; |
188 | } |
189 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
190 | |
191 | static int |
192 | pci_create_newid_file(struct pci_driver *drv) |
193 | { |
194 | int error = 0; |
195 | if (drv->probe != NULL) |
196 | error = driver_create_file(&drv->driver, &driver_attr_new_id); |
197 | return error; |
198 | } |
199 | |
200 | static void pci_remove_newid_file(struct pci_driver *drv) |
201 | { |
202 | driver_remove_file(&drv->driver, &driver_attr_new_id); |
203 | } |
204 | |
205 | static int |
206 | pci_create_removeid_file(struct pci_driver *drv) |
207 | { |
208 | int error = 0; |
209 | if (drv->probe != NULL) |
210 | error = driver_create_file(&drv->driver,&driver_attr_remove_id); |
211 | return error; |
212 | } |
213 | |
214 | static void pci_remove_removeid_file(struct pci_driver *drv) |
215 | { |
216 | driver_remove_file(&drv->driver, &driver_attr_remove_id); |
217 | } |
218 | #else /* !CONFIG_HOTPLUG */ |
219 | static inline int pci_create_newid_file(struct pci_driver *drv) |
220 | { |
221 | return 0; |
222 | } |
223 | static inline void pci_remove_newid_file(struct pci_driver *drv) {} |
224 | static inline int pci_create_removeid_file(struct pci_driver *drv) |
225 | { |
226 | return 0; |
227 | } |
228 | static inline void pci_remove_removeid_file(struct pci_driver *drv) {} |
229 | #endif |
230 | |
231 | /** |
232 | * pci_match_id - See if a pci device matches a given pci_id table |
233 | * @ids: array of PCI device id structures to search in |
234 | * @dev: the PCI device structure to match against. |
235 | * |
236 | * Used by a driver to check whether a PCI device present in the |
237 | * system is in its list of supported devices. Returns the matching |
238 | * pci_device_id structure or %NULL if there is no match. |
239 | * |
240 | * Deprecated, don't use this as it will not catch any dynamic ids |
241 | * that a driver might want to check for. |
242 | */ |
243 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
244 | struct pci_dev *dev) |
245 | { |
246 | if (ids) { |
247 | while (ids->vendor || ids->subvendor || ids->class_mask) { |
248 | if (pci_match_one_device(ids, dev)) |
249 | return ids; |
250 | ids++; |
251 | } |
252 | } |
253 | return NULL; |
254 | } |
255 | |
256 | /** |
257 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
258 | * @drv: the PCI driver to match against |
259 | * @dev: the PCI device structure to match against |
260 | * |
261 | * Used by a driver to check whether a PCI device present in the |
262 | * system is in its list of supported devices. Returns the matching |
263 | * pci_device_id structure or %NULL if there is no match. |
264 | */ |
265 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
266 | struct pci_dev *dev) |
267 | { |
268 | struct pci_dynid *dynid; |
269 | |
270 | /* Look at the dynamic ids first, before the static ones */ |
271 | spin_lock(&drv->dynids.lock); |
272 | list_for_each_entry(dynid, &drv->dynids.list, node) { |
273 | if (pci_match_one_device(&dynid->id, dev)) { |
274 | spin_unlock(&drv->dynids.lock); |
275 | return &dynid->id; |
276 | } |
277 | } |
278 | spin_unlock(&drv->dynids.lock); |
279 | |
280 | return pci_match_id(drv->id_table, dev); |
281 | } |
282 | |
283 | struct drv_dev_and_id { |
284 | struct pci_driver *drv; |
285 | struct pci_dev *dev; |
286 | const struct pci_device_id *id; |
287 | }; |
288 | |
289 | static long local_pci_probe(void *_ddi) |
290 | { |
291 | struct drv_dev_and_id *ddi = _ddi; |
292 | |
293 | return ddi->drv->probe(ddi->dev, ddi->id); |
294 | } |
295 | |
296 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
297 | const struct pci_device_id *id) |
298 | { |
299 | int error, node; |
300 | struct drv_dev_and_id ddi = { drv, dev, id }; |
301 | |
302 | /* Execute driver initialization on node where the device's |
303 | bus is attached to. This way the driver likely allocates |
304 | its local memory on the right node without any need to |
305 | change it. */ |
306 | node = dev_to_node(&dev->dev); |
307 | if (node >= 0) { |
308 | int cpu; |
309 | |
310 | get_online_cpus(); |
311 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
312 | if (cpu < nr_cpu_ids) |
313 | error = work_on_cpu(cpu, local_pci_probe, &ddi); |
314 | else |
315 | error = local_pci_probe(&ddi); |
316 | put_online_cpus(); |
317 | } else |
318 | error = local_pci_probe(&ddi); |
319 | return error; |
320 | } |
321 | |
322 | /** |
323 | * __pci_device_probe() |
324 | * @drv: driver to call to check if it wants the PCI device |
325 | * @pci_dev: PCI device being probed |
326 | * |
327 | * returns 0 on success, else error. |
328 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
329 | */ |
330 | static int |
331 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
332 | { |
333 | const struct pci_device_id *id; |
334 | int error = 0; |
335 | |
336 | if (!pci_dev->driver && drv->probe) { |
337 | error = -ENODEV; |
338 | |
339 | id = pci_match_device(drv, pci_dev); |
340 | if (id) |
341 | error = pci_call_probe(drv, pci_dev, id); |
342 | if (error >= 0) { |
343 | pci_dev->driver = drv; |
344 | error = 0; |
345 | } |
346 | } |
347 | return error; |
348 | } |
349 | |
350 | static int pci_device_probe(struct device * dev) |
351 | { |
352 | int error = 0; |
353 | struct pci_driver *drv; |
354 | struct pci_dev *pci_dev; |
355 | |
356 | drv = to_pci_driver(dev->driver); |
357 | pci_dev = to_pci_dev(dev); |
358 | pci_dev_get(pci_dev); |
359 | error = __pci_device_probe(drv, pci_dev); |
360 | if (error) |
361 | pci_dev_put(pci_dev); |
362 | |
363 | return error; |
364 | } |
365 | |
366 | static int pci_device_remove(struct device * dev) |
367 | { |
368 | struct pci_dev * pci_dev = to_pci_dev(dev); |
369 | struct pci_driver * drv = pci_dev->driver; |
370 | |
371 | if (drv) { |
372 | if (drv->remove) |
373 | drv->remove(pci_dev); |
374 | pci_dev->driver = NULL; |
375 | } |
376 | |
377 | /* |
378 | * If the device is still on, set the power state as "unknown", |
379 | * since it might change by the next time we load the driver. |
380 | */ |
381 | if (pci_dev->current_state == PCI_D0) |
382 | pci_dev->current_state = PCI_UNKNOWN; |
383 | |
384 | /* |
385 | * We would love to complain here if pci_dev->is_enabled is set, that |
386 | * the driver should have called pci_disable_device(), but the |
387 | * unfortunate fact is there are too many odd BIOS and bridge setups |
388 | * that don't like drivers doing that all of the time. |
389 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
390 | * horrible the crap we have to deal with is when we are awake... |
391 | */ |
392 | |
393 | pci_dev_put(pci_dev); |
394 | return 0; |
395 | } |
396 | |
397 | static void pci_device_shutdown(struct device *dev) |
398 | { |
399 | struct pci_dev *pci_dev = to_pci_dev(dev); |
400 | struct pci_driver *drv = pci_dev->driver; |
401 | |
402 | if (drv && drv->shutdown) |
403 | drv->shutdown(pci_dev); |
404 | pci_msi_shutdown(pci_dev); |
405 | pci_msix_shutdown(pci_dev); |
406 | } |
407 | |
408 | #ifdef CONFIG_PM_OPS |
409 | |
410 | /* Auxiliary functions used for system resume and run-time resume. */ |
411 | |
412 | /** |
413 | * pci_restore_standard_config - restore standard config registers of PCI device |
414 | * @pci_dev: PCI device to handle |
415 | */ |
416 | static int pci_restore_standard_config(struct pci_dev *pci_dev) |
417 | { |
418 | pci_update_current_state(pci_dev, PCI_UNKNOWN); |
419 | |
420 | if (pci_dev->current_state != PCI_D0) { |
421 | int error = pci_set_power_state(pci_dev, PCI_D0); |
422 | if (error) |
423 | return error; |
424 | } |
425 | |
426 | return pci_restore_state(pci_dev); |
427 | } |
428 | |
429 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
430 | { |
431 | pci_restore_standard_config(pci_dev); |
432 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
433 | } |
434 | |
435 | #endif |
436 | |
437 | #ifdef CONFIG_PM_SLEEP |
438 | |
439 | /* |
440 | * Default "suspend" method for devices that have no driver provided suspend, |
441 | * or not even a driver at all (second part). |
442 | */ |
443 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
444 | { |
445 | /* |
446 | * mark its power state as "unknown", since we don't know if |
447 | * e.g. the BIOS will change its device state when we suspend. |
448 | */ |
449 | if (pci_dev->current_state == PCI_D0) |
450 | pci_dev->current_state = PCI_UNKNOWN; |
451 | } |
452 | |
453 | /* |
454 | * Default "resume" method for devices that have no driver provided resume, |
455 | * or not even a driver at all (second part). |
456 | */ |
457 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
458 | { |
459 | int retval; |
460 | |
461 | /* if the device was enabled before suspend, reenable */ |
462 | retval = pci_reenable_device(pci_dev); |
463 | /* |
464 | * if the device was busmaster before the suspend, make it busmaster |
465 | * again |
466 | */ |
467 | if (pci_dev->is_busmaster) |
468 | pci_set_master(pci_dev); |
469 | |
470 | return retval; |
471 | } |
472 | |
473 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) |
474 | { |
475 | struct pci_dev * pci_dev = to_pci_dev(dev); |
476 | struct pci_driver * drv = pci_dev->driver; |
477 | |
478 | if (drv && drv->suspend) { |
479 | pci_power_t prev = pci_dev->current_state; |
480 | int error; |
481 | |
482 | error = drv->suspend(pci_dev, state); |
483 | suspend_report_result(drv->suspend, error); |
484 | if (error) |
485 | return error; |
486 | |
487 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
488 | && pci_dev->current_state != PCI_UNKNOWN) { |
489 | WARN_ONCE(pci_dev->current_state != prev, |
490 | "PCI PM: Device state not saved by %pF\n", |
491 | drv->suspend); |
492 | } |
493 | } |
494 | |
495 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
496 | |
497 | return 0; |
498 | } |
499 | |
500 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
501 | { |
502 | struct pci_dev * pci_dev = to_pci_dev(dev); |
503 | struct pci_driver * drv = pci_dev->driver; |
504 | |
505 | if (drv && drv->suspend_late) { |
506 | pci_power_t prev = pci_dev->current_state; |
507 | int error; |
508 | |
509 | error = drv->suspend_late(pci_dev, state); |
510 | suspend_report_result(drv->suspend_late, error); |
511 | if (error) |
512 | return error; |
513 | |
514 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
515 | && pci_dev->current_state != PCI_UNKNOWN) { |
516 | WARN_ONCE(pci_dev->current_state != prev, |
517 | "PCI PM: Device state not saved by %pF\n", |
518 | drv->suspend_late); |
519 | return 0; |
520 | } |
521 | } |
522 | |
523 | if (!pci_dev->state_saved) |
524 | pci_save_state(pci_dev); |
525 | |
526 | pci_pm_set_unknown_state(pci_dev); |
527 | |
528 | return 0; |
529 | } |
530 | |
531 | static int pci_legacy_resume_early(struct device *dev) |
532 | { |
533 | struct pci_dev * pci_dev = to_pci_dev(dev); |
534 | struct pci_driver * drv = pci_dev->driver; |
535 | |
536 | return drv && drv->resume_early ? |
537 | drv->resume_early(pci_dev) : 0; |
538 | } |
539 | |
540 | static int pci_legacy_resume(struct device *dev) |
541 | { |
542 | struct pci_dev * pci_dev = to_pci_dev(dev); |
543 | struct pci_driver * drv = pci_dev->driver; |
544 | |
545 | pci_fixup_device(pci_fixup_resume, pci_dev); |
546 | |
547 | return drv && drv->resume ? |
548 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); |
549 | } |
550 | |
551 | /* Auxiliary functions used by the new power management framework */ |
552 | |
553 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
554 | { |
555 | pci_fixup_device(pci_fixup_resume, pci_dev); |
556 | |
557 | if (!pci_is_bridge(pci_dev)) |
558 | pci_enable_wake(pci_dev, PCI_D0, false); |
559 | } |
560 | |
561 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
562 | { |
563 | /* Disable non-bridge devices without PM support */ |
564 | if (!pci_is_bridge(pci_dev)) |
565 | pci_disable_enabled_device(pci_dev); |
566 | } |
567 | |
568 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
569 | { |
570 | struct pci_driver *drv = pci_dev->driver; |
571 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
572 | || drv->resume_early); |
573 | |
574 | /* |
575 | * Legacy PM support is used by default, so warn if the new framework is |
576 | * supported as well. Drivers are supposed to support either the |
577 | * former, or the latter, but not both at the same time. |
578 | */ |
579 | WARN_ON(ret && drv->driver.pm); |
580 | |
581 | return ret; |
582 | } |
583 | |
584 | /* New power management framework */ |
585 | |
586 | static int pci_pm_prepare(struct device *dev) |
587 | { |
588 | struct device_driver *drv = dev->driver; |
589 | int error = 0; |
590 | |
591 | /* |
592 | * PCI devices suspended at run time need to be resumed at this |
593 | * point, because in general it is necessary to reconfigure them for |
594 | * system suspend. Namely, if the device is supposed to wake up the |
595 | * system from the sleep state, we may need to reconfigure it for this |
596 | * purpose. In turn, if the device is not supposed to wake up the |
597 | * system from the sleep state, we'll have to prevent it from signaling |
598 | * wake-up. |
599 | */ |
600 | pm_runtime_resume(dev); |
601 | |
602 | if (drv && drv->pm && drv->pm->prepare) |
603 | error = drv->pm->prepare(dev); |
604 | |
605 | return error; |
606 | } |
607 | |
608 | static void pci_pm_complete(struct device *dev) |
609 | { |
610 | struct device_driver *drv = dev->driver; |
611 | |
612 | if (drv && drv->pm && drv->pm->complete) |
613 | drv->pm->complete(dev); |
614 | } |
615 | |
616 | #else /* !CONFIG_PM_SLEEP */ |
617 | |
618 | #define pci_pm_prepare NULL |
619 | #define pci_pm_complete NULL |
620 | |
621 | #endif /* !CONFIG_PM_SLEEP */ |
622 | |
623 | #ifdef CONFIG_SUSPEND |
624 | |
625 | static int pci_pm_suspend(struct device *dev) |
626 | { |
627 | struct pci_dev *pci_dev = to_pci_dev(dev); |
628 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
629 | |
630 | if (pci_has_legacy_pm_support(pci_dev)) |
631 | return pci_legacy_suspend(dev, PMSG_SUSPEND); |
632 | |
633 | if (!pm) { |
634 | pci_pm_default_suspend(pci_dev); |
635 | goto Fixup; |
636 | } |
637 | |
638 | if (pm->suspend) { |
639 | pci_power_t prev = pci_dev->current_state; |
640 | int error; |
641 | |
642 | error = pm->suspend(dev); |
643 | suspend_report_result(pm->suspend, error); |
644 | if (error) |
645 | return error; |
646 | |
647 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
648 | && pci_dev->current_state != PCI_UNKNOWN) { |
649 | WARN_ONCE(pci_dev->current_state != prev, |
650 | "PCI PM: State of device not saved by %pF\n", |
651 | pm->suspend); |
652 | } |
653 | } |
654 | |
655 | Fixup: |
656 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
657 | |
658 | return 0; |
659 | } |
660 | |
661 | static int pci_pm_suspend_noirq(struct device *dev) |
662 | { |
663 | struct pci_dev *pci_dev = to_pci_dev(dev); |
664 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
665 | |
666 | if (pci_has_legacy_pm_support(pci_dev)) |
667 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); |
668 | |
669 | if (!pm) { |
670 | pci_save_state(pci_dev); |
671 | return 0; |
672 | } |
673 | |
674 | if (pm->suspend_noirq) { |
675 | pci_power_t prev = pci_dev->current_state; |
676 | int error; |
677 | |
678 | error = pm->suspend_noirq(dev); |
679 | suspend_report_result(pm->suspend_noirq, error); |
680 | if (error) |
681 | return error; |
682 | |
683 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
684 | && pci_dev->current_state != PCI_UNKNOWN) { |
685 | WARN_ONCE(pci_dev->current_state != prev, |
686 | "PCI PM: State of device not saved by %pF\n", |
687 | pm->suspend_noirq); |
688 | return 0; |
689 | } |
690 | } |
691 | |
692 | if (!pci_dev->state_saved) { |
693 | pci_save_state(pci_dev); |
694 | if (!pci_is_bridge(pci_dev)) |
695 | pci_prepare_to_sleep(pci_dev); |
696 | } |
697 | |
698 | pci_pm_set_unknown_state(pci_dev); |
699 | |
700 | return 0; |
701 | } |
702 | |
703 | static int pci_pm_resume_noirq(struct device *dev) |
704 | { |
705 | struct pci_dev *pci_dev = to_pci_dev(dev); |
706 | struct device_driver *drv = dev->driver; |
707 | int error = 0; |
708 | |
709 | pci_pm_default_resume_early(pci_dev); |
710 | |
711 | if (pci_has_legacy_pm_support(pci_dev)) |
712 | return pci_legacy_resume_early(dev); |
713 | |
714 | if (drv && drv->pm && drv->pm->resume_noirq) |
715 | error = drv->pm->resume_noirq(dev); |
716 | |
717 | return error; |
718 | } |
719 | |
720 | static int pci_pm_resume(struct device *dev) |
721 | { |
722 | struct pci_dev *pci_dev = to_pci_dev(dev); |
723 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
724 | int error = 0; |
725 | |
726 | /* |
727 | * This is necessary for the suspend error path in which resume is |
728 | * called without restoring the standard config registers of the device. |
729 | */ |
730 | if (pci_dev->state_saved) |
731 | pci_restore_standard_config(pci_dev); |
732 | |
733 | if (pci_has_legacy_pm_support(pci_dev)) |
734 | return pci_legacy_resume(dev); |
735 | |
736 | pci_pm_default_resume(pci_dev); |
737 | |
738 | if (pm) { |
739 | if (pm->resume) |
740 | error = pm->resume(dev); |
741 | } else { |
742 | pci_pm_reenable_device(pci_dev); |
743 | } |
744 | |
745 | return error; |
746 | } |
747 | |
748 | #else /* !CONFIG_SUSPEND */ |
749 | |
750 | #define pci_pm_suspend NULL |
751 | #define pci_pm_suspend_noirq NULL |
752 | #define pci_pm_resume NULL |
753 | #define pci_pm_resume_noirq NULL |
754 | |
755 | #endif /* !CONFIG_SUSPEND */ |
756 | |
757 | #ifdef CONFIG_HIBERNATION |
758 | |
759 | static int pci_pm_freeze(struct device *dev) |
760 | { |
761 | struct pci_dev *pci_dev = to_pci_dev(dev); |
762 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
763 | |
764 | if (pci_has_legacy_pm_support(pci_dev)) |
765 | return pci_legacy_suspend(dev, PMSG_FREEZE); |
766 | |
767 | if (!pm) { |
768 | pci_pm_default_suspend(pci_dev); |
769 | return 0; |
770 | } |
771 | |
772 | if (pm->freeze) { |
773 | int error; |
774 | |
775 | error = pm->freeze(dev); |
776 | suspend_report_result(pm->freeze, error); |
777 | if (error) |
778 | return error; |
779 | } |
780 | |
781 | return 0; |
782 | } |
783 | |
784 | static int pci_pm_freeze_noirq(struct device *dev) |
785 | { |
786 | struct pci_dev *pci_dev = to_pci_dev(dev); |
787 | struct device_driver *drv = dev->driver; |
788 | |
789 | if (pci_has_legacy_pm_support(pci_dev)) |
790 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); |
791 | |
792 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
793 | int error; |
794 | |
795 | error = drv->pm->freeze_noirq(dev); |
796 | suspend_report_result(drv->pm->freeze_noirq, error); |
797 | if (error) |
798 | return error; |
799 | } |
800 | |
801 | if (!pci_dev->state_saved) |
802 | pci_save_state(pci_dev); |
803 | |
804 | pci_pm_set_unknown_state(pci_dev); |
805 | |
806 | return 0; |
807 | } |
808 | |
809 | static int pci_pm_thaw_noirq(struct device *dev) |
810 | { |
811 | struct pci_dev *pci_dev = to_pci_dev(dev); |
812 | struct device_driver *drv = dev->driver; |
813 | int error = 0; |
814 | |
815 | if (pci_has_legacy_pm_support(pci_dev)) |
816 | return pci_legacy_resume_early(dev); |
817 | |
818 | pci_update_current_state(pci_dev, PCI_D0); |
819 | |
820 | if (drv && drv->pm && drv->pm->thaw_noirq) |
821 | error = drv->pm->thaw_noirq(dev); |
822 | |
823 | return error; |
824 | } |
825 | |
826 | static int pci_pm_thaw(struct device *dev) |
827 | { |
828 | struct pci_dev *pci_dev = to_pci_dev(dev); |
829 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
830 | int error = 0; |
831 | |
832 | if (pci_has_legacy_pm_support(pci_dev)) |
833 | return pci_legacy_resume(dev); |
834 | |
835 | if (pm) { |
836 | if (pm->thaw) |
837 | error = pm->thaw(dev); |
838 | } else { |
839 | pci_pm_reenable_device(pci_dev); |
840 | } |
841 | |
842 | pci_dev->state_saved = false; |
843 | |
844 | return error; |
845 | } |
846 | |
847 | static int pci_pm_poweroff(struct device *dev) |
848 | { |
849 | struct pci_dev *pci_dev = to_pci_dev(dev); |
850 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
851 | |
852 | if (pci_has_legacy_pm_support(pci_dev)) |
853 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); |
854 | |
855 | if (!pm) { |
856 | pci_pm_default_suspend(pci_dev); |
857 | goto Fixup; |
858 | } |
859 | |
860 | if (pm->poweroff) { |
861 | int error; |
862 | |
863 | error = pm->poweroff(dev); |
864 | suspend_report_result(pm->poweroff, error); |
865 | if (error) |
866 | return error; |
867 | } |
868 | |
869 | Fixup: |
870 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
871 | |
872 | return 0; |
873 | } |
874 | |
875 | static int pci_pm_poweroff_noirq(struct device *dev) |
876 | { |
877 | struct pci_dev *pci_dev = to_pci_dev(dev); |
878 | struct device_driver *drv = dev->driver; |
879 | |
880 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
881 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); |
882 | |
883 | if (!drv || !drv->pm) |
884 | return 0; |
885 | |
886 | if (drv->pm->poweroff_noirq) { |
887 | int error; |
888 | |
889 | error = drv->pm->poweroff_noirq(dev); |
890 | suspend_report_result(drv->pm->poweroff_noirq, error); |
891 | if (error) |
892 | return error; |
893 | } |
894 | |
895 | if (!pci_dev->state_saved && !pci_is_bridge(pci_dev)) |
896 | pci_prepare_to_sleep(pci_dev); |
897 | |
898 | return 0; |
899 | } |
900 | |
901 | static int pci_pm_restore_noirq(struct device *dev) |
902 | { |
903 | struct pci_dev *pci_dev = to_pci_dev(dev); |
904 | struct device_driver *drv = dev->driver; |
905 | int error = 0; |
906 | |
907 | pci_pm_default_resume_early(pci_dev); |
908 | |
909 | if (pci_has_legacy_pm_support(pci_dev)) |
910 | return pci_legacy_resume_early(dev); |
911 | |
912 | if (drv && drv->pm && drv->pm->restore_noirq) |
913 | error = drv->pm->restore_noirq(dev); |
914 | |
915 | return error; |
916 | } |
917 | |
918 | static int pci_pm_restore(struct device *dev) |
919 | { |
920 | struct pci_dev *pci_dev = to_pci_dev(dev); |
921 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
922 | int error = 0; |
923 | |
924 | /* |
925 | * This is necessary for the hibernation error path in which restore is |
926 | * called without restoring the standard config registers of the device. |
927 | */ |
928 | if (pci_dev->state_saved) |
929 | pci_restore_standard_config(pci_dev); |
930 | |
931 | if (pci_has_legacy_pm_support(pci_dev)) |
932 | return pci_legacy_resume(dev); |
933 | |
934 | pci_pm_default_resume(pci_dev); |
935 | |
936 | if (pm) { |
937 | if (pm->restore) |
938 | error = pm->restore(dev); |
939 | } else { |
940 | pci_pm_reenable_device(pci_dev); |
941 | } |
942 | |
943 | return error; |
944 | } |
945 | |
946 | #else /* !CONFIG_HIBERNATION */ |
947 | |
948 | #define pci_pm_freeze NULL |
949 | #define pci_pm_freeze_noirq NULL |
950 | #define pci_pm_thaw NULL |
951 | #define pci_pm_thaw_noirq NULL |
952 | #define pci_pm_poweroff NULL |
953 | #define pci_pm_poweroff_noirq NULL |
954 | #define pci_pm_restore NULL |
955 | #define pci_pm_restore_noirq NULL |
956 | |
957 | #endif /* !CONFIG_HIBERNATION */ |
958 | |
959 | #ifdef CONFIG_PM_RUNTIME |
960 | |
961 | static int pci_pm_runtime_suspend(struct device *dev) |
962 | { |
963 | struct pci_dev *pci_dev = to_pci_dev(dev); |
964 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
965 | pci_power_t prev = pci_dev->current_state; |
966 | int error; |
967 | |
968 | if (!pm || !pm->runtime_suspend) |
969 | return -ENOSYS; |
970 | |
971 | error = pm->runtime_suspend(dev); |
972 | suspend_report_result(pm->runtime_suspend, error); |
973 | if (error) |
974 | return error; |
975 | |
976 | pci_fixup_device(pci_fixup_suspend, pci_dev); |
977 | |
978 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
979 | && pci_dev->current_state != PCI_UNKNOWN) { |
980 | WARN_ONCE(pci_dev->current_state != prev, |
981 | "PCI PM: State of device not saved by %pF\n", |
982 | pm->runtime_suspend); |
983 | return 0; |
984 | } |
985 | |
986 | if (!pci_dev->state_saved) |
987 | pci_save_state(pci_dev); |
988 | |
989 | pci_finish_runtime_suspend(pci_dev); |
990 | |
991 | return 0; |
992 | } |
993 | |
994 | static int pci_pm_runtime_resume(struct device *dev) |
995 | { |
996 | struct pci_dev *pci_dev = to_pci_dev(dev); |
997 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
998 | |
999 | if (!pm || !pm->runtime_resume) |
1000 | return -ENOSYS; |
1001 | |
1002 | pci_pm_default_resume_early(pci_dev); |
1003 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1004 | pci_fixup_device(pci_fixup_resume, pci_dev); |
1005 | |
1006 | return pm->runtime_resume(dev); |
1007 | } |
1008 | |
1009 | static int pci_pm_runtime_idle(struct device *dev) |
1010 | { |
1011 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
1012 | |
1013 | if (!pm) |
1014 | return -ENOSYS; |
1015 | |
1016 | if (pm->runtime_idle) { |
1017 | int ret = pm->runtime_idle(dev); |
1018 | if (ret) |
1019 | return ret; |
1020 | } |
1021 | |
1022 | pm_runtime_suspend(dev); |
1023 | |
1024 | return 0; |
1025 | } |
1026 | |
1027 | #else /* !CONFIG_PM_RUNTIME */ |
1028 | |
1029 | #define pci_pm_runtime_suspend NULL |
1030 | #define pci_pm_runtime_resume NULL |
1031 | #define pci_pm_runtime_idle NULL |
1032 | |
1033 | #endif /* !CONFIG_PM_RUNTIME */ |
1034 | |
1035 | #ifdef CONFIG_PM_OPS |
1036 | |
1037 | const struct dev_pm_ops pci_dev_pm_ops = { |
1038 | .prepare = pci_pm_prepare, |
1039 | .complete = pci_pm_complete, |
1040 | .suspend = pci_pm_suspend, |
1041 | .resume = pci_pm_resume, |
1042 | .freeze = pci_pm_freeze, |
1043 | .thaw = pci_pm_thaw, |
1044 | .poweroff = pci_pm_poweroff, |
1045 | .restore = pci_pm_restore, |
1046 | .suspend_noirq = pci_pm_suspend_noirq, |
1047 | .resume_noirq = pci_pm_resume_noirq, |
1048 | .freeze_noirq = pci_pm_freeze_noirq, |
1049 | .thaw_noirq = pci_pm_thaw_noirq, |
1050 | .poweroff_noirq = pci_pm_poweroff_noirq, |
1051 | .restore_noirq = pci_pm_restore_noirq, |
1052 | .runtime_suspend = pci_pm_runtime_suspend, |
1053 | .runtime_resume = pci_pm_runtime_resume, |
1054 | .runtime_idle = pci_pm_runtime_idle, |
1055 | }; |
1056 | |
1057 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
1058 | |
1059 | #else /* !COMFIG_PM_OPS */ |
1060 | |
1061 | #define PCI_PM_OPS_PTR NULL |
1062 | |
1063 | #endif /* !COMFIG_PM_OPS */ |
1064 | |
1065 | /** |
1066 | * __pci_register_driver - register a new pci driver |
1067 | * @drv: the driver structure to register |
1068 | * @owner: owner module of drv |
1069 | * @mod_name: module name string |
1070 | * |
1071 | * Adds the driver structure to the list of registered drivers. |
1072 | * Returns a negative value on error, otherwise 0. |
1073 | * If no error occurred, the driver remains registered even if |
1074 | * no device was claimed during registration. |
1075 | */ |
1076 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1077 | const char *mod_name) |
1078 | { |
1079 | int error; |
1080 | |
1081 | /* initialize common driver fields */ |
1082 | drv->driver.name = drv->name; |
1083 | drv->driver.bus = &pci_bus_type; |
1084 | drv->driver.owner = owner; |
1085 | drv->driver.mod_name = mod_name; |
1086 | |
1087 | spin_lock_init(&drv->dynids.lock); |
1088 | INIT_LIST_HEAD(&drv->dynids.list); |
1089 | |
1090 | /* register with core */ |
1091 | error = driver_register(&drv->driver); |
1092 | if (error) |
1093 | goto out; |
1094 | |
1095 | error = pci_create_newid_file(drv); |
1096 | if (error) |
1097 | goto out_newid; |
1098 | |
1099 | error = pci_create_removeid_file(drv); |
1100 | if (error) |
1101 | goto out_removeid; |
1102 | out: |
1103 | return error; |
1104 | |
1105 | out_removeid: |
1106 | pci_remove_newid_file(drv); |
1107 | out_newid: |
1108 | driver_unregister(&drv->driver); |
1109 | goto out; |
1110 | } |
1111 | |
1112 | /** |
1113 | * pci_unregister_driver - unregister a pci driver |
1114 | * @drv: the driver structure to unregister |
1115 | * |
1116 | * Deletes the driver structure from the list of registered PCI drivers, |
1117 | * gives it a chance to clean up by calling its remove() function for |
1118 | * each device it was responsible for, and marks those devices as |
1119 | * driverless. |
1120 | */ |
1121 | |
1122 | void |
1123 | pci_unregister_driver(struct pci_driver *drv) |
1124 | { |
1125 | pci_remove_removeid_file(drv); |
1126 | pci_remove_newid_file(drv); |
1127 | driver_unregister(&drv->driver); |
1128 | pci_free_dynids(drv); |
1129 | } |
1130 | |
1131 | static struct pci_driver pci_compat_driver = { |
1132 | .name = "compat" |
1133 | }; |
1134 | |
1135 | /** |
1136 | * pci_dev_driver - get the pci_driver of a device |
1137 | * @dev: the device to query |
1138 | * |
1139 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1140 | * registered driver for the device. |
1141 | */ |
1142 | struct pci_driver * |
1143 | pci_dev_driver(const struct pci_dev *dev) |
1144 | { |
1145 | if (dev->driver) |
1146 | return dev->driver; |
1147 | else { |
1148 | int i; |
1149 | for(i=0; i<=PCI_ROM_RESOURCE; i++) |
1150 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1151 | return &pci_compat_driver; |
1152 | } |
1153 | return NULL; |
1154 | } |
1155 | |
1156 | /** |
1157 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure |
1158 | * @dev: the PCI device structure to match against |
1159 | * @drv: the device driver to search for matching PCI device id structures |
1160 | * |
1161 | * Used by a driver to check whether a PCI device present in the |
1162 | * system is in its list of supported devices. Returns the matching |
1163 | * pci_device_id structure or %NULL if there is no match. |
1164 | */ |
1165 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1166 | { |
1167 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1168 | struct pci_driver *pci_drv = to_pci_driver(drv); |
1169 | const struct pci_device_id *found_id; |
1170 | |
1171 | found_id = pci_match_device(pci_drv, pci_dev); |
1172 | if (found_id) |
1173 | return 1; |
1174 | |
1175 | return 0; |
1176 | } |
1177 | |
1178 | /** |
1179 | * pci_dev_get - increments the reference count of the pci device structure |
1180 | * @dev: the device being referenced |
1181 | * |
1182 | * Each live reference to a device should be refcounted. |
1183 | * |
1184 | * Drivers for PCI devices should normally record such references in |
1185 | * their probe() methods, when they bind to a device, and release |
1186 | * them by calling pci_dev_put(), in their disconnect() methods. |
1187 | * |
1188 | * A pointer to the device with the incremented reference counter is returned. |
1189 | */ |
1190 | struct pci_dev *pci_dev_get(struct pci_dev *dev) |
1191 | { |
1192 | if (dev) |
1193 | get_device(&dev->dev); |
1194 | return dev; |
1195 | } |
1196 | |
1197 | /** |
1198 | * pci_dev_put - release a use of the pci device structure |
1199 | * @dev: device that's been disconnected |
1200 | * |
1201 | * Must be called when a user of a device is finished with it. When the last |
1202 | * user of the device calls this function, the memory of the device is freed. |
1203 | */ |
1204 | void pci_dev_put(struct pci_dev *dev) |
1205 | { |
1206 | if (dev) |
1207 | put_device(&dev->dev); |
1208 | } |
1209 | |
1210 | #ifndef CONFIG_HOTPLUG |
1211 | int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1212 | { |
1213 | return -ENODEV; |
1214 | } |
1215 | #endif |
1216 | |
1217 | struct bus_type pci_bus_type = { |
1218 | .name = "pci", |
1219 | .match = pci_bus_match, |
1220 | .uevent = pci_uevent, |
1221 | .probe = pci_device_probe, |
1222 | .remove = pci_device_remove, |
1223 | .shutdown = pci_device_shutdown, |
1224 | .dev_attrs = pci_dev_attrs, |
1225 | .bus_attrs = pci_bus_attrs, |
1226 | .pm = PCI_PM_OPS_PTR, |
1227 | }; |
1228 | |
1229 | static int __init pci_driver_init(void) |
1230 | { |
1231 | return bus_register(&pci_bus_type); |
1232 | } |
1233 | |
1234 | postcore_initcall(pci_driver_init); |
1235 | |
1236 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
1237 | EXPORT_SYMBOL(pci_match_id); |
1238 | EXPORT_SYMBOL(__pci_register_driver); |
1239 | EXPORT_SYMBOL(pci_unregister_driver); |
1240 | EXPORT_SYMBOL(pci_dev_driver); |
1241 | EXPORT_SYMBOL(pci_bus_type); |
1242 | EXPORT_SYMBOL(pci_dev_get); |
1243 | EXPORT_SYMBOL(pci_dev_put); |
1244 |
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jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9