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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/pci/pci-driver.c | |
3 | * | |
2b937303 GKH |
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 | * | |
1da177e4 LT |
9 | */ |
10 | ||
11 | #include <linux/pci.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/device.h> | |
d42c6997 | 15 | #include <linux/mempolicy.h> |
4e57b681 TS |
16 | #include <linux/string.h> |
17 | #include <linux/slab.h> | |
8c65b4a6 | 18 | #include <linux/sched.h> |
873392ca | 19 | #include <linux/cpu.h> |
6cbf8214 | 20 | #include <linux/pm_runtime.h> |
eea3fc03 | 21 | #include <linux/suspend.h> |
1da177e4 LT |
22 | #include "pci.h" |
23 | ||
75865858 GKH |
24 | struct pci_dynid { |
25 | struct list_head node; | |
26 | struct pci_device_id id; | |
27 | }; | |
1da177e4 | 28 | |
9dba910e TH |
29 | /** |
30 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices | |
31 | * @drv: target pci driver | |
32 | * @vendor: PCI vendor ID | |
33 | * @device: PCI device ID | |
34 | * @subvendor: PCI subvendor ID | |
35 | * @subdevice: PCI subdevice ID | |
36 | * @class: PCI class | |
37 | * @class_mask: PCI class mask | |
38 | * @driver_data: private driver data | |
39 | * | |
40 | * Adds a new dynamic pci device ID to this driver and causes the | |
41 | * driver to probe for all devices again. @drv must have been | |
42 | * registered prior to calling this function. | |
43 | * | |
44 | * CONTEXT: | |
45 | * Does GFP_KERNEL allocation. | |
46 | * | |
47 | * RETURNS: | |
48 | * 0 on success, -errno on failure. | |
49 | */ | |
50 | int pci_add_dynid(struct pci_driver *drv, | |
51 | unsigned int vendor, unsigned int device, | |
52 | unsigned int subvendor, unsigned int subdevice, | |
53 | unsigned int class, unsigned int class_mask, | |
54 | unsigned long driver_data) | |
55 | { | |
56 | struct pci_dynid *dynid; | |
57 | int retval; | |
58 | ||
59 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
60 | if (!dynid) | |
61 | return -ENOMEM; | |
62 | ||
63 | dynid->id.vendor = vendor; | |
64 | dynid->id.device = device; | |
65 | dynid->id.subvendor = subvendor; | |
66 | dynid->id.subdevice = subdevice; | |
67 | dynid->id.class = class; | |
68 | dynid->id.class_mask = class_mask; | |
69 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 70 | |
9dba910e TH |
71 | spin_lock(&drv->dynids.lock); |
72 | list_add_tail(&dynid->node, &drv->dynids.list); | |
73 | spin_unlock(&drv->dynids.lock); | |
74 | ||
9dba910e | 75 | retval = driver_attach(&drv->driver); |
9dba910e TH |
76 | |
77 | return retval; | |
78 | } | |
79 | ||
80 | static void pci_free_dynids(struct pci_driver *drv) | |
81 | { | |
82 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 83 | |
9dba910e TH |
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 | |
1da177e4 | 96 | /** |
9dba910e | 97 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
98 | * @driver: target device driver |
99 | * @buf: buffer for scanning device ID data | |
100 | * @count: input size | |
1da177e4 | 101 | * |
9dba910e | 102 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 103 | */ |
f8eb1005 | 104 | static ssize_t |
1da177e4 LT |
105 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
106 | { | |
1da177e4 | 107 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 108 | const struct pci_device_id *ids = pdrv->id_table; |
6ba18636 | 109 | __u32 vendor, device, subvendor=PCI_ANY_ID, |
1da177e4 LT |
110 | subdevice=PCI_ANY_ID, class=0, class_mask=0; |
111 | unsigned long driver_data=0; | |
112 | int fields=0; | |
9dba910e | 113 | int retval; |
1da177e4 | 114 | |
b41d6cf3 | 115 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
116 | &vendor, &device, &subvendor, &subdevice, |
117 | &class, &class_mask, &driver_data); | |
6ba18636 | 118 | if (fields < 2) |
1da177e4 LT |
119 | return -EINVAL; |
120 | ||
b41d6cf3 JD |
121 | /* Only accept driver_data values that match an existing id_table |
122 | entry */ | |
2debb4d2 CW |
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++; | |
b41d6cf3 | 131 | } |
2debb4d2 CW |
132 | if (retval) /* No match */ |
133 | return retval; | |
b41d6cf3 | 134 | } |
b41d6cf3 | 135 | |
9dba910e TH |
136 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
137 | class, class_mask, driver_data); | |
b19441af GKH |
138 | if (retval) |
139 | return retval; | |
1da177e4 LT |
140 | return count; |
141 | } | |
1da177e4 | 142 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
1da177e4 | 143 | |
0994375e CW |
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 | ||
1da177e4 | 190 | static int |
ed283e9f | 191 | pci_create_newid_files(struct pci_driver *drv) |
1da177e4 LT |
192 | { |
193 | int error = 0; | |
0994375e | 194 | |
ed283e9f AS |
195 | if (drv->probe != NULL) { |
196 | error = driver_create_file(&drv->driver, &driver_attr_new_id); | |
197 | if (error == 0) { | |
198 | error = driver_create_file(&drv->driver, | |
199 | &driver_attr_remove_id); | |
200 | if (error) | |
201 | driver_remove_file(&drv->driver, | |
202 | &driver_attr_new_id); | |
203 | } | |
204 | } | |
0994375e CW |
205 | return error; |
206 | } | |
207 | ||
ed283e9f | 208 | static void pci_remove_newid_files(struct pci_driver *drv) |
0994375e CW |
209 | { |
210 | driver_remove_file(&drv->driver, &driver_attr_remove_id); | |
ed283e9f | 211 | driver_remove_file(&drv->driver, &driver_attr_new_id); |
0994375e | 212 | } |
1da177e4 | 213 | #else /* !CONFIG_HOTPLUG */ |
ed283e9f | 214 | static inline int pci_create_newid_files(struct pci_driver *drv) |
1da177e4 LT |
215 | { |
216 | return 0; | |
217 | } | |
ed283e9f | 218 | static inline void pci_remove_newid_files(struct pci_driver *drv) {} |
1da177e4 LT |
219 | #endif |
220 | ||
221 | /** | |
75865858 | 222 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 223 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
224 | * @dev: the PCI device structure to match against. |
225 | * | |
1da177e4 | 226 | * Used by a driver to check whether a PCI device present in the |
75865858 | 227 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 228 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 229 | * |
8b60756a | 230 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 231 | * that a driver might want to check for. |
1da177e4 | 232 | */ |
75865858 GKH |
233 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
234 | struct pci_dev *dev) | |
1da177e4 | 235 | { |
75865858 GKH |
236 | if (ids) { |
237 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
238 | if (pci_match_one_device(ids, dev)) | |
239 | return ids; | |
240 | ids++; | |
241 | } | |
1da177e4 LT |
242 | } |
243 | return NULL; | |
244 | } | |
245 | ||
246 | /** | |
ae9608af | 247 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 248 | * @drv: the PCI driver to match against |
39ba487f | 249 | * @dev: the PCI device structure to match against |
75865858 GKH |
250 | * |
251 | * Used by a driver to check whether a PCI device present in the | |
252 | * system is in its list of supported devices. Returns the matching | |
253 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 254 | */ |
d73460d7 AB |
255 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
256 | struct pci_dev *dev) | |
75865858 | 257 | { |
75865858 | 258 | struct pci_dynid *dynid; |
1da177e4 | 259 | |
7461b60a | 260 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
261 | spin_lock(&drv->dynids.lock); |
262 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
263 | if (pci_match_one_device(&dynid->id, dev)) { | |
264 | spin_unlock(&drv->dynids.lock); | |
265 | return &dynid->id; | |
266 | } | |
1da177e4 | 267 | } |
75865858 | 268 | spin_unlock(&drv->dynids.lock); |
7461b60a RK |
269 | |
270 | return pci_match_id(drv->id_table, dev); | |
1da177e4 LT |
271 | } |
272 | ||
873392ca RR |
273 | struct drv_dev_and_id { |
274 | struct pci_driver *drv; | |
275 | struct pci_dev *dev; | |
276 | const struct pci_device_id *id; | |
277 | }; | |
278 | ||
279 | static long local_pci_probe(void *_ddi) | |
280 | { | |
281 | struct drv_dev_and_id *ddi = _ddi; | |
f3ec4f87 AS |
282 | struct device *dev = &ddi->dev->dev; |
283 | int rc; | |
284 | ||
285 | /* Unbound PCI devices are always set to disabled and suspended. | |
286 | * During probe, the device is set to enabled and active and the | |
287 | * usage count is incremented. If the driver supports runtime PM, | |
288 | * it should call pm_runtime_put_noidle() in its probe routine and | |
289 | * pm_runtime_get_noresume() in its remove routine. | |
290 | */ | |
291 | pm_runtime_get_noresume(dev); | |
292 | pm_runtime_set_active(dev); | |
293 | pm_runtime_enable(dev); | |
294 | ||
295 | rc = ddi->drv->probe(ddi->dev, ddi->id); | |
296 | if (rc) { | |
297 | pm_runtime_disable(dev); | |
298 | pm_runtime_set_suspended(dev); | |
299 | pm_runtime_put_noidle(dev); | |
300 | } | |
301 | return rc; | |
873392ca RR |
302 | } |
303 | ||
d42c6997 AK |
304 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
305 | const struct pci_device_id *id) | |
306 | { | |
873392ca RR |
307 | int error, node; |
308 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
309 | ||
310 | /* Execute driver initialization on node where the device's | |
311 | bus is attached to. This way the driver likely allocates | |
312 | its local memory on the right node without any need to | |
313 | change it. */ | |
314 | node = dev_to_node(&dev->dev); | |
f70316da | 315 | if (node >= 0) { |
873392ca | 316 | int cpu; |
873392ca RR |
317 | |
318 | get_online_cpus(); | |
a70f7302 | 319 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
320 | if (cpu < nr_cpu_ids) |
321 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
322 | else | |
323 | error = local_pci_probe(&ddi); | |
324 | put_online_cpus(); | |
325 | } else | |
326 | error = local_pci_probe(&ddi); | |
d42c6997 AK |
327 | return error; |
328 | } | |
329 | ||
1da177e4 | 330 | /** |
23ea3793 | 331 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
332 | * @drv: driver to call to check if it wants the PCI device |
333 | * @pci_dev: PCI device being probed | |
1da177e4 | 334 | * |
8f7020d3 | 335 | * returns 0 on success, else error. |
1da177e4 LT |
336 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
337 | */ | |
338 | static int | |
339 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) | |
75865858 GKH |
340 | { |
341 | const struct pci_device_id *id; | |
1da177e4 LT |
342 | int error = 0; |
343 | ||
344 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
345 | error = -ENODEV; |
346 | ||
347 | id = pci_match_device(drv, pci_dev); | |
348 | if (id) | |
d42c6997 | 349 | error = pci_call_probe(drv, pci_dev, id); |
75865858 GKH |
350 | if (error >= 0) { |
351 | pci_dev->driver = drv; | |
352 | error = 0; | |
353 | } | |
1da177e4 LT |
354 | } |
355 | return error; | |
356 | } | |
357 | ||
358 | static int pci_device_probe(struct device * dev) | |
359 | { | |
360 | int error = 0; | |
361 | struct pci_driver *drv; | |
362 | struct pci_dev *pci_dev; | |
363 | ||
364 | drv = to_pci_driver(dev->driver); | |
365 | pci_dev = to_pci_dev(dev); | |
366 | pci_dev_get(pci_dev); | |
367 | error = __pci_device_probe(drv, pci_dev); | |
368 | if (error) | |
369 | pci_dev_put(pci_dev); | |
370 | ||
371 | return error; | |
372 | } | |
373 | ||
374 | static int pci_device_remove(struct device * dev) | |
375 | { | |
376 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
377 | struct pci_driver * drv = pci_dev->driver; | |
378 | ||
379 | if (drv) { | |
f3ec4f87 AS |
380 | if (drv->remove) { |
381 | pm_runtime_get_sync(dev); | |
1da177e4 | 382 | drv->remove(pci_dev); |
f3ec4f87 AS |
383 | pm_runtime_put_noidle(dev); |
384 | } | |
1da177e4 LT |
385 | pci_dev->driver = NULL; |
386 | } | |
387 | ||
f3ec4f87 AS |
388 | /* Undo the runtime PM settings in local_pci_probe() */ |
389 | pm_runtime_disable(dev); | |
390 | pm_runtime_set_suspended(dev); | |
391 | pm_runtime_put_noidle(dev); | |
392 | ||
2449e06a SL |
393 | /* |
394 | * If the device is still on, set the power state as "unknown", | |
395 | * since it might change by the next time we load the driver. | |
396 | */ | |
397 | if (pci_dev->current_state == PCI_D0) | |
398 | pci_dev->current_state = PCI_UNKNOWN; | |
399 | ||
1da177e4 LT |
400 | /* |
401 | * We would love to complain here if pci_dev->is_enabled is set, that | |
402 | * the driver should have called pci_disable_device(), but the | |
403 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
404 | * that don't like drivers doing that all of the time. | |
405 | * Oh well, we can dream of sane hardware when we sleep, no matter how | |
406 | * horrible the crap we have to deal with is when we are awake... | |
407 | */ | |
408 | ||
409 | pci_dev_put(pci_dev); | |
410 | return 0; | |
411 | } | |
412 | ||
bbb44d9f RW |
413 | static void pci_device_shutdown(struct device *dev) |
414 | { | |
415 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
416 | struct pci_driver *drv = pci_dev->driver; | |
417 | ||
418 | if (drv && drv->shutdown) | |
419 | drv->shutdown(pci_dev); | |
420 | pci_msi_shutdown(pci_dev); | |
421 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 422 | |
b566a22c KA |
423 | /* |
424 | * Turn off Bus Master bit on the device to tell it to not | |
425 | * continue to do DMA | |
426 | */ | |
427 | pci_disable_device(pci_dev); | |
428 | ||
5b415f1e RW |
429 | /* |
430 | * Devices may be enabled to wake up by runtime PM, but they need not | |
431 | * be supposed to wake up the system from its "power off" state (e.g. | |
432 | * ACPI S5). Therefore disable wakeup for all devices that aren't | |
433 | * supposed to wake up the system at this point. The state argument | |
434 | * will be ignored by pci_enable_wake(). | |
435 | */ | |
436 | if (!device_may_wakeup(dev)) | |
437 | pci_enable_wake(pci_dev, PCI_UNKNOWN, false); | |
bbb44d9f RW |
438 | } |
439 | ||
aa338601 | 440 | #ifdef CONFIG_PM |
6cbf8214 RW |
441 | |
442 | /* Auxiliary functions used for system resume and run-time resume. */ | |
443 | ||
444 | /** | |
445 | * pci_restore_standard_config - restore standard config registers of PCI device | |
446 | * @pci_dev: PCI device to handle | |
447 | */ | |
448 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
449 | { | |
450 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
451 | ||
452 | if (pci_dev->current_state != PCI_D0) { | |
453 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
454 | if (error) | |
455 | return error; | |
456 | } | |
457 | ||
1d3c16a8 JM |
458 | pci_restore_state(pci_dev); |
459 | return 0; | |
6cbf8214 RW |
460 | } |
461 | ||
db288c9c RW |
462 | #endif |
463 | ||
464 | #ifdef CONFIG_PM_SLEEP | |
465 | ||
6cbf8214 RW |
466 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
467 | { | |
db288c9c RW |
468 | pci_power_up(pci_dev); |
469 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
470 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
471 | } | |
472 | ||
fa58d305 RW |
473 | /* |
474 | * Default "suspend" method for devices that have no driver provided suspend, | |
475 | * or not even a driver at all (second part). | |
bbb44d9f | 476 | */ |
bb808945 | 477 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 478 | { |
bbb44d9f RW |
479 | /* |
480 | * mark its power state as "unknown", since we don't know if | |
481 | * e.g. the BIOS will change its device state when we suspend. | |
482 | */ | |
483 | if (pci_dev->current_state == PCI_D0) | |
484 | pci_dev->current_state = PCI_UNKNOWN; | |
485 | } | |
486 | ||
355a72d7 RW |
487 | /* |
488 | * Default "resume" method for devices that have no driver provided resume, | |
489 | * or not even a driver at all (second part). | |
490 | */ | |
bb808945 | 491 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
492 | { |
493 | int retval; | |
494 | ||
bbb44d9f RW |
495 | /* if the device was enabled before suspend, reenable */ |
496 | retval = pci_reenable_device(pci_dev); | |
497 | /* | |
498 | * if the device was busmaster before the suspend, make it busmaster | |
499 | * again | |
500 | */ | |
501 | if (pci_dev->is_busmaster) | |
502 | pci_set_master(pci_dev); | |
503 | ||
504 | return retval; | |
505 | } | |
506 | ||
507 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 LT |
508 | { |
509 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
510 | struct pci_driver * drv = pci_dev->driver; | |
46939f8b | 511 | |
02669492 | 512 | if (drv && drv->suspend) { |
99dadce8 | 513 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 514 | int error; |
aa8c6c93 | 515 | |
57ef8026 FP |
516 | error = drv->suspend(pci_dev, state); |
517 | suspend_report_result(drv->suspend, error); | |
518 | if (error) | |
519 | return error; | |
aa8c6c93 | 520 | |
46939f8b | 521 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
522 | && pci_dev->current_state != PCI_UNKNOWN) { |
523 | WARN_ONCE(pci_dev->current_state != prev, | |
524 | "PCI PM: Device state not saved by %pF\n", | |
525 | drv->suspend); | |
99dadce8 | 526 | } |
02669492 | 527 | } |
ad8cfa1d RW |
528 | |
529 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
530 | ||
46939f8b | 531 | return 0; |
1da177e4 LT |
532 | } |
533 | ||
bbb44d9f | 534 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb LT |
535 | { |
536 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
537 | struct pci_driver * drv = pci_dev->driver; | |
cbd69dbb LT |
538 | |
539 | if (drv && drv->suspend_late) { | |
46939f8b RW |
540 | pci_power_t prev = pci_dev->current_state; |
541 | int error; | |
542 | ||
57ef8026 FP |
543 | error = drv->suspend_late(pci_dev, state); |
544 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
545 | if (error) |
546 | return error; | |
547 | ||
548 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
549 | && pci_dev->current_state != PCI_UNKNOWN) { | |
550 | WARN_ONCE(pci_dev->current_state != prev, | |
551 | "PCI PM: Device state not saved by %pF\n", | |
552 | drv->suspend_late); | |
553 | return 0; | |
554 | } | |
cbd69dbb | 555 | } |
46939f8b RW |
556 | |
557 | if (!pci_dev->state_saved) | |
558 | pci_save_state(pci_dev); | |
559 | ||
560 | pci_pm_set_unknown_state(pci_dev); | |
561 | ||
562 | return 0; | |
cbd69dbb | 563 | } |
1da177e4 | 564 | |
f6dc1e5e RW |
565 | static int pci_legacy_resume_early(struct device *dev) |
566 | { | |
f6dc1e5e RW |
567 | struct pci_dev * pci_dev = to_pci_dev(dev); |
568 | struct pci_driver * drv = pci_dev->driver; | |
569 | ||
aa8c6c93 RW |
570 | return drv && drv->resume_early ? |
571 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
572 | } |
573 | ||
bbb44d9f | 574 | static int pci_legacy_resume(struct device *dev) |
1da177e4 LT |
575 | { |
576 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
577 | struct pci_driver * drv = pci_dev->driver; | |
578 | ||
ad8cfa1d RW |
579 | pci_fixup_device(pci_fixup_resume, pci_dev); |
580 | ||
aa8c6c93 RW |
581 | return drv && drv->resume ? |
582 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
583 | } |
584 | ||
571ff758 RW |
585 | /* Auxiliary functions used by the new power management framework */ |
586 | ||
5294e256 | 587 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 588 | { |
73410429 RW |
589 | pci_fixup_device(pci_fixup_resume, pci_dev); |
590 | ||
5294e256 RW |
591 | if (!pci_is_bridge(pci_dev)) |
592 | pci_enable_wake(pci_dev, PCI_D0, false); | |
571ff758 RW |
593 | } |
594 | ||
5294e256 | 595 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 596 | { |
5294e256 | 597 | /* Disable non-bridge devices without PM support */ |
cbbc2f6b RW |
598 | if (!pci_is_bridge(pci_dev)) |
599 | pci_disable_enabled_device(pci_dev); | |
73410429 RW |
600 | } |
601 | ||
07e836e8 RW |
602 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
603 | { | |
604 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 605 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 606 | || drv->resume_early); |
bb808945 RW |
607 | |
608 | /* | |
609 | * Legacy PM support is used by default, so warn if the new framework is | |
610 | * supported as well. Drivers are supposed to support either the | |
611 | * former, or the latter, but not both at the same time. | |
612 | */ | |
82440a82 DF |
613 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
614 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
615 | |
616 | return ret; | |
07e836e8 RW |
617 | } |
618 | ||
571ff758 RW |
619 | /* New power management framework */ |
620 | ||
bbb44d9f RW |
621 | static int pci_pm_prepare(struct device *dev) |
622 | { | |
623 | struct device_driver *drv = dev->driver; | |
624 | int error = 0; | |
625 | ||
eea3fc03 RW |
626 | /* |
627 | * If a PCI device configured to wake up the system from sleep states | |
628 | * has been suspended at run time and there's a resume request pending | |
629 | * for it, this is equivalent to the device signaling wakeup, so the | |
630 | * system suspend operation should be aborted. | |
631 | */ | |
632 | pm_runtime_get_noresume(dev); | |
633 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) | |
634 | pm_wakeup_event(dev, 0); | |
635 | ||
636 | if (pm_wakeup_pending()) { | |
637 | pm_runtime_put_sync(dev); | |
638 | return -EBUSY; | |
639 | } | |
640 | ||
6cbf8214 RW |
641 | /* |
642 | * PCI devices suspended at run time need to be resumed at this | |
643 | * point, because in general it is necessary to reconfigure them for | |
644 | * system suspend. Namely, if the device is supposed to wake up the | |
645 | * system from the sleep state, we may need to reconfigure it for this | |
646 | * purpose. In turn, if the device is not supposed to wake up the | |
647 | * system from the sleep state, we'll have to prevent it from signaling | |
648 | * wake-up. | |
649 | */ | |
eea3fc03 | 650 | pm_runtime_resume(dev); |
6cbf8214 | 651 | |
bbb44d9f RW |
652 | if (drv && drv->pm && drv->pm->prepare) |
653 | error = drv->pm->prepare(dev); | |
654 | ||
655 | return error; | |
656 | } | |
657 | ||
658 | static void pci_pm_complete(struct device *dev) | |
659 | { | |
660 | struct device_driver *drv = dev->driver; | |
661 | ||
662 | if (drv && drv->pm && drv->pm->complete) | |
663 | drv->pm->complete(dev); | |
a5f76d5e RW |
664 | |
665 | pm_runtime_put_sync(dev); | |
bbb44d9f RW |
666 | } |
667 | ||
6cbf8214 RW |
668 | #else /* !CONFIG_PM_SLEEP */ |
669 | ||
670 | #define pci_pm_prepare NULL | |
671 | #define pci_pm_complete NULL | |
672 | ||
673 | #endif /* !CONFIG_PM_SLEEP */ | |
674 | ||
bbb44d9f RW |
675 | #ifdef CONFIG_SUSPEND |
676 | ||
677 | static int pci_pm_suspend(struct device *dev) | |
678 | { | |
679 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 680 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 681 | |
ad8cfa1d RW |
682 | if (pci_has_legacy_pm_support(pci_dev)) |
683 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 684 | |
5294e256 RW |
685 | if (!pm) { |
686 | pci_pm_default_suspend(pci_dev); | |
687 | goto Fixup; | |
688 | } | |
689 | ||
5294e256 RW |
690 | if (pm->suspend) { |
691 | pci_power_t prev = pci_dev->current_state; | |
692 | int error; | |
693 | ||
ddb7c9d2 RW |
694 | error = pm->suspend(dev); |
695 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
696 | if (error) |
697 | return error; | |
698 | ||
46939f8b | 699 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
700 | && pci_dev->current_state != PCI_UNKNOWN) { |
701 | WARN_ONCE(pci_dev->current_state != prev, | |
702 | "PCI PM: State of device not saved by %pF\n", | |
703 | pm->suspend); | |
5294e256 | 704 | } |
bbb44d9f | 705 | } |
fa58d305 | 706 | |
5294e256 RW |
707 | Fixup: |
708 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
709 | ||
710 | return 0; | |
bbb44d9f RW |
711 | } |
712 | ||
713 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 714 | { |
355a72d7 | 715 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 716 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 717 | |
bb808945 RW |
718 | if (pci_has_legacy_pm_support(pci_dev)) |
719 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
720 | ||
931ff68a RW |
721 | if (!pm) { |
722 | pci_save_state(pci_dev); | |
46939f8b | 723 | return 0; |
931ff68a | 724 | } |
46939f8b RW |
725 | |
726 | if (pm->suspend_noirq) { | |
727 | pci_power_t prev = pci_dev->current_state; | |
728 | int error; | |
729 | ||
730 | error = pm->suspend_noirq(dev); | |
731 | suspend_report_result(pm->suspend_noirq, error); | |
732 | if (error) | |
733 | return error; | |
734 | ||
735 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
736 | && pci_dev->current_state != PCI_UNKNOWN) { | |
737 | WARN_ONCE(pci_dev->current_state != prev, | |
738 | "PCI PM: State of device not saved by %pF\n", | |
739 | pm->suspend_noirq); | |
740 | return 0; | |
741 | } | |
bbb44d9f RW |
742 | } |
743 | ||
46939f8b RW |
744 | if (!pci_dev->state_saved) { |
745 | pci_save_state(pci_dev); | |
746 | if (!pci_is_bridge(pci_dev)) | |
747 | pci_prepare_to_sleep(pci_dev); | |
748 | } | |
d67e37d7 | 749 | |
46939f8b RW |
750 | pci_pm_set_unknown_state(pci_dev); |
751 | ||
dbf0e4c7 AS |
752 | /* |
753 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
754 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
755 | * hasn't been quiesced and tries to turn it off. If the controller | |
756 | * is already in D3, this can hang or cause memory corruption. | |
757 | * | |
758 | * Since the value of the COMMAND register doesn't matter once the | |
759 | * device has been suspended, we can safely set it to 0 here. | |
760 | */ | |
761 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
762 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
763 | ||
46939f8b | 764 | return 0; |
c8958177 | 765 | } |
1da177e4 | 766 | |
f6dc1e5e | 767 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
768 | { |
769 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
770 | struct device_driver *drv = dev->driver; | |
355a72d7 | 771 | int error = 0; |
bbb44d9f | 772 | |
6cbf8214 | 773 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 774 | |
ad8cfa1d | 775 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 776 | return pci_legacy_resume_early(dev); |
bb808945 | 777 | |
f6dc1e5e RW |
778 | if (drv && drv->pm && drv->pm->resume_noirq) |
779 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
780 | |
781 | return error; | |
782 | } | |
783 | ||
f6dc1e5e | 784 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 785 | { |
355a72d7 | 786 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 787 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
788 | int error = 0; |
789 | ||
418e4da3 RW |
790 | /* |
791 | * This is necessary for the suspend error path in which resume is | |
792 | * called without restoring the standard config registers of the device. | |
793 | */ | |
794 | if (pci_dev->state_saved) | |
795 | pci_restore_standard_config(pci_dev); | |
796 | ||
ad8cfa1d | 797 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 798 | return pci_legacy_resume(dev); |
bb808945 | 799 | |
5294e256 | 800 | pci_pm_default_resume(pci_dev); |
73410429 | 801 | |
5294e256 RW |
802 | if (pm) { |
803 | if (pm->resume) | |
804 | error = pm->resume(dev); | |
805 | } else { | |
806 | pci_pm_reenable_device(pci_dev); | |
807 | } | |
bbb44d9f | 808 | |
999cce4a | 809 | return error; |
bbb44d9f RW |
810 | } |
811 | ||
812 | #else /* !CONFIG_SUSPEND */ | |
813 | ||
814 | #define pci_pm_suspend NULL | |
815 | #define pci_pm_suspend_noirq NULL | |
816 | #define pci_pm_resume NULL | |
817 | #define pci_pm_resume_noirq NULL | |
818 | ||
819 | #endif /* !CONFIG_SUSPEND */ | |
820 | ||
1f112cee | 821 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f RW |
822 | |
823 | static int pci_pm_freeze(struct device *dev) | |
824 | { | |
825 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 826 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 827 | |
ad8cfa1d RW |
828 | if (pci_has_legacy_pm_support(pci_dev)) |
829 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 830 | |
5294e256 RW |
831 | if (!pm) { |
832 | pci_pm_default_suspend(pci_dev); | |
833 | return 0; | |
bbb44d9f RW |
834 | } |
835 | ||
5294e256 RW |
836 | if (pm->freeze) { |
837 | int error; | |
838 | ||
839 | error = pm->freeze(dev); | |
840 | suspend_report_result(pm->freeze, error); | |
841 | if (error) | |
842 | return error; | |
843 | } | |
844 | ||
5294e256 | 845 | return 0; |
bbb44d9f RW |
846 | } |
847 | ||
848 | static int pci_pm_freeze_noirq(struct device *dev) | |
849 | { | |
355a72d7 | 850 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 851 | struct device_driver *drv = dev->driver; |
bbb44d9f | 852 | |
bb808945 RW |
853 | if (pci_has_legacy_pm_support(pci_dev)) |
854 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
855 | ||
d67e37d7 | 856 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
857 | int error; |
858 | ||
d67e37d7 RW |
859 | error = drv->pm->freeze_noirq(dev); |
860 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
861 | if (error) |
862 | return error; | |
bbb44d9f RW |
863 | } |
864 | ||
46939f8b RW |
865 | if (!pci_dev->state_saved) |
866 | pci_save_state(pci_dev); | |
d67e37d7 | 867 | |
46939f8b RW |
868 | pci_pm_set_unknown_state(pci_dev); |
869 | ||
870 | return 0; | |
bbb44d9f RW |
871 | } |
872 | ||
f6dc1e5e | 873 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 874 | { |
355a72d7 | 875 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
876 | struct device_driver *drv = dev->driver; |
877 | int error = 0; | |
878 | ||
ad8cfa1d | 879 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 880 | return pci_legacy_resume_early(dev); |
bb808945 | 881 | |
f6dc1e5e | 882 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 883 | |
f6dc1e5e RW |
884 | if (drv && drv->pm && drv->pm->thaw_noirq) |
885 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
886 | |
887 | return error; | |
888 | } | |
889 | ||
f6dc1e5e | 890 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 891 | { |
355a72d7 | 892 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 893 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
894 | int error = 0; |
895 | ||
ad8cfa1d | 896 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 897 | return pci_legacy_resume(dev); |
bb808945 | 898 | |
5294e256 RW |
899 | if (pm) { |
900 | if (pm->thaw) | |
901 | error = pm->thaw(dev); | |
902 | } else { | |
903 | pci_pm_reenable_device(pci_dev); | |
904 | } | |
bbb44d9f | 905 | |
4b77b0a2 RW |
906 | pci_dev->state_saved = false; |
907 | ||
bbb44d9f RW |
908 | return error; |
909 | } | |
910 | ||
911 | static int pci_pm_poweroff(struct device *dev) | |
912 | { | |
355a72d7 | 913 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 914 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 915 | |
ad8cfa1d RW |
916 | if (pci_has_legacy_pm_support(pci_dev)) |
917 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 918 | |
5294e256 RW |
919 | if (!pm) { |
920 | pci_pm_default_suspend(pci_dev); | |
921 | goto Fixup; | |
922 | } | |
923 | ||
5294e256 | 924 | if (pm->poweroff) { |
46939f8b RW |
925 | int error; |
926 | ||
ddb7c9d2 RW |
927 | error = pm->poweroff(dev); |
928 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
929 | if (error) |
930 | return error; | |
bbb44d9f RW |
931 | } |
932 | ||
5294e256 RW |
933 | Fixup: |
934 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 935 | |
46939f8b | 936 | return 0; |
bbb44d9f RW |
937 | } |
938 | ||
939 | static int pci_pm_poweroff_noirq(struct device *dev) | |
940 | { | |
46939f8b | 941 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 942 | struct device_driver *drv = dev->driver; |
bbb44d9f | 943 | |
bb808945 RW |
944 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
945 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
946 | ||
46939f8b RW |
947 | if (!drv || !drv->pm) |
948 | return 0; | |
949 | ||
950 | if (drv->pm->poweroff_noirq) { | |
951 | int error; | |
952 | ||
d67e37d7 RW |
953 | error = drv->pm->poweroff_noirq(dev); |
954 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
955 | if (error) |
956 | return error; | |
bbb44d9f RW |
957 | } |
958 | ||
46939f8b RW |
959 | if (!pci_dev->state_saved && !pci_is_bridge(pci_dev)) |
960 | pci_prepare_to_sleep(pci_dev); | |
961 | ||
962 | return 0; | |
bbb44d9f RW |
963 | } |
964 | ||
f6dc1e5e | 965 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
966 | { |
967 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
968 | struct device_driver *drv = dev->driver; | |
355a72d7 | 969 | int error = 0; |
bbb44d9f | 970 | |
6cbf8214 | 971 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 972 | |
ad8cfa1d | 973 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 974 | return pci_legacy_resume_early(dev); |
bb808945 | 975 | |
f6dc1e5e RW |
976 | if (drv && drv->pm && drv->pm->restore_noirq) |
977 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
978 | |
979 | return error; | |
980 | } | |
981 | ||
f6dc1e5e | 982 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
983 | { |
984 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 985 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
986 | int error = 0; |
987 | ||
418e4da3 RW |
988 | /* |
989 | * This is necessary for the hibernation error path in which restore is | |
990 | * called without restoring the standard config registers of the device. | |
991 | */ | |
992 | if (pci_dev->state_saved) | |
993 | pci_restore_standard_config(pci_dev); | |
994 | ||
ad8cfa1d | 995 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 996 | return pci_legacy_resume(dev); |
bb808945 | 997 | |
5294e256 | 998 | pci_pm_default_resume(pci_dev); |
73410429 | 999 | |
5294e256 RW |
1000 | if (pm) { |
1001 | if (pm->restore) | |
1002 | error = pm->restore(dev); | |
1003 | } else { | |
1004 | pci_pm_reenable_device(pci_dev); | |
1005 | } | |
bbb44d9f RW |
1006 | |
1007 | return error; | |
c8958177 | 1008 | } |
1da177e4 | 1009 | |
1f112cee | 1010 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1011 | |
1012 | #define pci_pm_freeze NULL | |
1013 | #define pci_pm_freeze_noirq NULL | |
1014 | #define pci_pm_thaw NULL | |
1015 | #define pci_pm_thaw_noirq NULL | |
1016 | #define pci_pm_poweroff NULL | |
1017 | #define pci_pm_poweroff_noirq NULL | |
1018 | #define pci_pm_restore NULL | |
1019 | #define pci_pm_restore_noirq NULL | |
1020 | ||
1f112cee | 1021 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1022 | |
6cbf8214 RW |
1023 | #ifdef CONFIG_PM_RUNTIME |
1024 | ||
1025 | static int pci_pm_runtime_suspend(struct device *dev) | |
1026 | { | |
1027 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1028 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1029 | pci_power_t prev = pci_dev->current_state; | |
1030 | int error; | |
1031 | ||
1032 | if (!pm || !pm->runtime_suspend) | |
1033 | return -ENOSYS; | |
1034 | ||
448bd857 | 1035 | pci_dev->no_d3cold = false; |
6cbf8214 RW |
1036 | error = pm->runtime_suspend(dev); |
1037 | suspend_report_result(pm->runtime_suspend, error); | |
1038 | if (error) | |
1039 | return error; | |
448bd857 HY |
1040 | if (!pci_dev->d3cold_allowed) |
1041 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1042 | |
1043 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1044 | ||
1045 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1046 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1047 | WARN_ONCE(pci_dev->current_state != prev, | |
1048 | "PCI PM: State of device not saved by %pF\n", | |
1049 | pm->runtime_suspend); | |
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | if (!pci_dev->state_saved) | |
1054 | pci_save_state(pci_dev); | |
1055 | ||
1056 | pci_finish_runtime_suspend(pci_dev); | |
1057 | ||
1058 | return 0; | |
1059 | } | |
1060 | ||
1061 | static int pci_pm_runtime_resume(struct device *dev) | |
1062 | { | |
448bd857 | 1063 | int rc; |
6cbf8214 RW |
1064 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1065 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1066 | ||
1067 | if (!pm || !pm->runtime_resume) | |
1068 | return -ENOSYS; | |
1069 | ||
db288c9c RW |
1070 | pci_restore_standard_config(pci_dev); |
1071 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1072 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1073 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1074 | ||
448bd857 HY |
1075 | rc = pm->runtime_resume(dev); |
1076 | ||
1077 | pci_dev->runtime_d3cold = false; | |
1078 | ||
1079 | return rc; | |
6cbf8214 RW |
1080 | } |
1081 | ||
1082 | static int pci_pm_runtime_idle(struct device *dev) | |
1083 | { | |
1084 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1085 | ||
1086 | if (!pm) | |
1087 | return -ENOSYS; | |
1088 | ||
1089 | if (pm->runtime_idle) { | |
1090 | int ret = pm->runtime_idle(dev); | |
1091 | if (ret) | |
1092 | return ret; | |
1093 | } | |
1094 | ||
1095 | pm_runtime_suspend(dev); | |
1096 | ||
1097 | return 0; | |
1098 | } | |
1099 | ||
1100 | #else /* !CONFIG_PM_RUNTIME */ | |
1101 | ||
1102 | #define pci_pm_runtime_suspend NULL | |
1103 | #define pci_pm_runtime_resume NULL | |
1104 | #define pci_pm_runtime_idle NULL | |
1105 | ||
1106 | #endif /* !CONFIG_PM_RUNTIME */ | |
1107 | ||
aa338601 | 1108 | #ifdef CONFIG_PM |
6cbf8214 | 1109 | |
8150f32b | 1110 | const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 RW |
1111 | .prepare = pci_pm_prepare, |
1112 | .complete = pci_pm_complete, | |
1113 | .suspend = pci_pm_suspend, | |
1114 | .resume = pci_pm_resume, | |
1115 | .freeze = pci_pm_freeze, | |
1116 | .thaw = pci_pm_thaw, | |
1117 | .poweroff = pci_pm_poweroff, | |
1118 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1119 | .suspend_noirq = pci_pm_suspend_noirq, |
1120 | .resume_noirq = pci_pm_resume_noirq, | |
1121 | .freeze_noirq = pci_pm_freeze_noirq, | |
1122 | .thaw_noirq = pci_pm_thaw_noirq, | |
1123 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1124 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1125 | .runtime_suspend = pci_pm_runtime_suspend, |
1126 | .runtime_resume = pci_pm_runtime_resume, | |
1127 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1128 | }; |
1129 | ||
adf09493 | 1130 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1131 | |
6cbf8214 | 1132 | #else /* !COMFIG_PM_OPS */ |
bbb44d9f RW |
1133 | |
1134 | #define PCI_PM_OPS_PTR NULL | |
1135 | ||
6cbf8214 | 1136 | #endif /* !COMFIG_PM_OPS */ |
bbb44d9f | 1137 | |
1da177e4 | 1138 | /** |
863b18f4 | 1139 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1140 | * @drv: the driver structure to register |
863b18f4 | 1141 | * @owner: owner module of drv |
f95d882d | 1142 | * @mod_name: module name string |
1da177e4 LT |
1143 | * |
1144 | * Adds the driver structure to the list of registered drivers. | |
1145 | * Returns a negative value on error, otherwise 0. | |
eaae4b3a | 1146 | * If no error occurred, the driver remains registered even if |
1da177e4 LT |
1147 | * no device was claimed during registration. |
1148 | */ | |
725522b5 GKH |
1149 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1150 | const char *mod_name) | |
1da177e4 LT |
1151 | { |
1152 | int error; | |
1153 | ||
1154 | /* initialize common driver fields */ | |
1155 | drv->driver.name = drv->name; | |
1156 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1157 | drv->driver.owner = owner; |
725522b5 | 1158 | drv->driver.mod_name = mod_name; |
50b00755 | 1159 | |
75865858 GKH |
1160 | spin_lock_init(&drv->dynids.lock); |
1161 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1162 | |
1163 | /* register with core */ | |
1164 | error = driver_register(&drv->driver); | |
50bf14b3 | 1165 | if (error) |
0994375e | 1166 | goto out; |
1da177e4 | 1167 | |
ed283e9f | 1168 | error = pci_create_newid_files(drv); |
50bf14b3 | 1169 | if (error) |
0994375e | 1170 | goto out_newid; |
0994375e | 1171 | out: |
1da177e4 | 1172 | return error; |
0994375e | 1173 | |
0994375e CW |
1174 | out_newid: |
1175 | driver_unregister(&drv->driver); | |
1176 | goto out; | |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | /** | |
1180 | * pci_unregister_driver - unregister a pci driver | |
1181 | * @drv: the driver structure to unregister | |
1182 | * | |
1183 | * Deletes the driver structure from the list of registered PCI drivers, | |
1184 | * gives it a chance to clean up by calling its remove() function for | |
1185 | * each device it was responsible for, and marks those devices as | |
1186 | * driverless. | |
1187 | */ | |
1188 | ||
1189 | void | |
1190 | pci_unregister_driver(struct pci_driver *drv) | |
1191 | { | |
ed283e9f | 1192 | pci_remove_newid_files(drv); |
1da177e4 LT |
1193 | driver_unregister(&drv->driver); |
1194 | pci_free_dynids(drv); | |
1195 | } | |
1196 | ||
1197 | static struct pci_driver pci_compat_driver = { | |
1198 | .name = "compat" | |
1199 | }; | |
1200 | ||
1201 | /** | |
1202 | * pci_dev_driver - get the pci_driver of a device | |
1203 | * @dev: the device to query | |
1204 | * | |
1205 | * Returns the appropriate pci_driver structure or %NULL if there is no | |
1206 | * registered driver for the device. | |
1207 | */ | |
1208 | struct pci_driver * | |
1209 | pci_dev_driver(const struct pci_dev *dev) | |
1210 | { | |
1211 | if (dev->driver) | |
1212 | return dev->driver; | |
1213 | else { | |
1214 | int i; | |
1215 | for(i=0; i<=PCI_ROM_RESOURCE; i++) | |
1216 | if (dev->resource[i].flags & IORESOURCE_BUSY) | |
1217 | return &pci_compat_driver; | |
1218 | } | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | /** | |
1223 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1224 | * @dev: the PCI device structure to match against |
8f7020d3 | 1225 | * @drv: the device driver to search for matching PCI device id structures |
1da177e4 LT |
1226 | * |
1227 | * Used by a driver to check whether a PCI device present in the | |
8f7020d3 | 1228 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1229 | * pci_device_id structure or %NULL if there is no match. |
1230 | */ | |
75865858 | 1231 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1232 | { |
75865858 GKH |
1233 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1234 | struct pci_driver *pci_drv = to_pci_driver(drv); | |
1da177e4 LT |
1235 | const struct pci_device_id *found_id; |
1236 | ||
75865858 | 1237 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1238 | if (found_id) |
1239 | return 1; | |
1240 | ||
75865858 | 1241 | return 0; |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | /** | |
1245 | * pci_dev_get - increments the reference count of the pci device structure | |
1246 | * @dev: the device being referenced | |
1247 | * | |
1248 | * Each live reference to a device should be refcounted. | |
1249 | * | |
1250 | * Drivers for PCI devices should normally record such references in | |
1251 | * their probe() methods, when they bind to a device, and release | |
1252 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1253 | * | |
1254 | * A pointer to the device with the incremented reference counter is returned. | |
1255 | */ | |
1256 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1257 | { | |
1258 | if (dev) | |
1259 | get_device(&dev->dev); | |
1260 | return dev; | |
1261 | } | |
1262 | ||
1263 | /** | |
1264 | * pci_dev_put - release a use of the pci device structure | |
1265 | * @dev: device that's been disconnected | |
1266 | * | |
1267 | * Must be called when a user of a device is finished with it. When the last | |
1268 | * user of the device calls this function, the memory of the device is freed. | |
1269 | */ | |
1270 | void pci_dev_put(struct pci_dev *dev) | |
1271 | { | |
1272 | if (dev) | |
1273 | put_device(&dev->dev); | |
1274 | } | |
1275 | ||
1276 | #ifndef CONFIG_HOTPLUG | |
7eff2e7a | 1277 | int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 LT |
1278 | { |
1279 | return -ENODEV; | |
1280 | } | |
1281 | #endif | |
1282 | ||
1283 | struct bus_type pci_bus_type = { | |
1284 | .name = "pci", | |
1285 | .match = pci_bus_match, | |
312c004d | 1286 | .uevent = pci_uevent, |
b15d686a RK |
1287 | .probe = pci_device_probe, |
1288 | .remove = pci_device_remove, | |
cbd69dbb | 1289 | .shutdown = pci_device_shutdown, |
1da177e4 | 1290 | .dev_attrs = pci_dev_attrs, |
705b1aaa | 1291 | .bus_attrs = pci_bus_attrs, |
bbb44d9f | 1292 | .pm = PCI_PM_OPS_PTR, |
1da177e4 LT |
1293 | }; |
1294 | ||
1295 | static int __init pci_driver_init(void) | |
1296 | { | |
1297 | return bus_register(&pci_bus_type); | |
1298 | } | |
1299 | ||
1300 | postcore_initcall(pci_driver_init); | |
1301 | ||
9dba910e | 1302 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
75865858 | 1303 | EXPORT_SYMBOL(pci_match_id); |
863b18f4 | 1304 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1305 | EXPORT_SYMBOL(pci_unregister_driver); |
1306 | EXPORT_SYMBOL(pci_dev_driver); | |
1307 | EXPORT_SYMBOL(pci_bus_type); | |
1308 | EXPORT_SYMBOL(pci_dev_get); | |
1309 | EXPORT_SYMBOL(pci_dev_put); |