Commit | Line | Data |
---|---|---|
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> |
4fc9bbf9 | 22 | #include <linux/kexec.h> |
1da177e4 LT |
23 | #include "pci.h" |
24 | ||
75865858 GKH |
25 | struct pci_dynid { |
26 | struct list_head node; | |
27 | struct pci_device_id id; | |
28 | }; | |
1da177e4 | 29 | |
9dba910e TH |
30 | /** |
31 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices | |
32 | * @drv: target pci driver | |
33 | * @vendor: PCI vendor ID | |
34 | * @device: PCI device ID | |
35 | * @subvendor: PCI subvendor ID | |
36 | * @subdevice: PCI subdevice ID | |
37 | * @class: PCI class | |
38 | * @class_mask: PCI class mask | |
39 | * @driver_data: private driver data | |
40 | * | |
41 | * Adds a new dynamic pci device ID to this driver and causes the | |
42 | * driver to probe for all devices again. @drv must have been | |
43 | * registered prior to calling this function. | |
44 | * | |
45 | * CONTEXT: | |
46 | * Does GFP_KERNEL allocation. | |
47 | * | |
48 | * RETURNS: | |
49 | * 0 on success, -errno on failure. | |
50 | */ | |
51 | int pci_add_dynid(struct pci_driver *drv, | |
52 | unsigned int vendor, unsigned int device, | |
53 | unsigned int subvendor, unsigned int subdevice, | |
54 | unsigned int class, unsigned int class_mask, | |
55 | unsigned long driver_data) | |
56 | { | |
57 | struct pci_dynid *dynid; | |
58 | int retval; | |
59 | ||
60 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
61 | if (!dynid) | |
62 | return -ENOMEM; | |
63 | ||
64 | dynid->id.vendor = vendor; | |
65 | dynid->id.device = device; | |
66 | dynid->id.subvendor = subvendor; | |
67 | dynid->id.subdevice = subdevice; | |
68 | dynid->id.class = class; | |
69 | dynid->id.class_mask = class_mask; | |
70 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 71 | |
9dba910e TH |
72 | spin_lock(&drv->dynids.lock); |
73 | list_add_tail(&dynid->node, &drv->dynids.list); | |
74 | spin_unlock(&drv->dynids.lock); | |
75 | ||
9dba910e | 76 | retval = driver_attach(&drv->driver); |
9dba910e TH |
77 | |
78 | return retval; | |
79 | } | |
80 | ||
81 | static void pci_free_dynids(struct pci_driver *drv) | |
82 | { | |
83 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 84 | |
9dba910e TH |
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 | ||
1da177e4 | 93 | /** |
9dba910e | 94 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
95 | * @driver: target device driver |
96 | * @buf: buffer for scanning device ID data | |
97 | * @count: input size | |
1da177e4 | 98 | * |
9dba910e | 99 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 100 | */ |
f8eb1005 | 101 | static ssize_t |
1da177e4 LT |
102 | store_new_id(struct device_driver *driver, const char *buf, size_t count) |
103 | { | |
1da177e4 | 104 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 105 | const struct pci_device_id *ids = pdrv->id_table; |
6ba18636 | 106 | __u32 vendor, device, subvendor=PCI_ANY_ID, |
1da177e4 LT |
107 | subdevice=PCI_ANY_ID, class=0, class_mask=0; |
108 | unsigned long driver_data=0; | |
109 | int fields=0; | |
8895d3bc | 110 | int retval = 0; |
1da177e4 | 111 | |
b41d6cf3 | 112 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
113 | &vendor, &device, &subvendor, &subdevice, |
114 | &class, &class_mask, &driver_data); | |
6ba18636 | 115 | if (fields < 2) |
1da177e4 LT |
116 | return -EINVAL; |
117 | ||
8895d3bc BD |
118 | if (fields != 7) { |
119 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
120 | if (!pdev) | |
121 | return -ENOMEM; | |
122 | ||
123 | pdev->vendor = vendor; | |
124 | pdev->device = device; | |
125 | pdev->subsystem_vendor = subvendor; | |
126 | pdev->subsystem_device = subdevice; | |
127 | pdev->class = class; | |
128 | ||
129 | if (pci_match_id(pdrv->id_table, pdev)) | |
130 | retval = -EEXIST; | |
131 | ||
132 | kfree(pdev); | |
133 | ||
134 | if (retval) | |
135 | return retval; | |
136 | } | |
137 | ||
b41d6cf3 JD |
138 | /* Only accept driver_data values that match an existing id_table |
139 | entry */ | |
2debb4d2 CW |
140 | if (ids) { |
141 | retval = -EINVAL; | |
142 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
143 | if (driver_data == ids->driver_data) { | |
144 | retval = 0; | |
145 | break; | |
146 | } | |
147 | ids++; | |
b41d6cf3 | 148 | } |
2debb4d2 CW |
149 | if (retval) /* No match */ |
150 | return retval; | |
b41d6cf3 | 151 | } |
b41d6cf3 | 152 | |
9dba910e TH |
153 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
154 | class, class_mask, driver_data); | |
b19441af GKH |
155 | if (retval) |
156 | return retval; | |
1da177e4 LT |
157 | return count; |
158 | } | |
2229c1fb | 159 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
1da177e4 | 160 | |
0994375e CW |
161 | /** |
162 | * store_remove_id - remove a PCI device ID from this driver | |
163 | * @driver: target device driver | |
164 | * @buf: buffer for scanning device ID data | |
165 | * @count: input size | |
166 | * | |
167 | * Removes a dynamic pci device ID to this driver. | |
168 | */ | |
169 | static ssize_t | |
170 | store_remove_id(struct device_driver *driver, const char *buf, size_t count) | |
171 | { | |
172 | struct pci_dynid *dynid, *n; | |
173 | struct pci_driver *pdrv = to_pci_driver(driver); | |
174 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
175 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
176 | int fields = 0; | |
177 | int retval = -ENODEV; | |
178 | ||
179 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
180 | &vendor, &device, &subvendor, &subdevice, | |
181 | &class, &class_mask); | |
182 | if (fields < 2) | |
183 | return -EINVAL; | |
184 | ||
185 | spin_lock(&pdrv->dynids.lock); | |
186 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
187 | struct pci_device_id *id = &dynid->id; | |
188 | if ((id->vendor == vendor) && | |
189 | (id->device == device) && | |
190 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
191 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
192 | !((id->class ^ class) & class_mask)) { | |
193 | list_del(&dynid->node); | |
194 | kfree(dynid); | |
195 | retval = 0; | |
196 | break; | |
197 | } | |
198 | } | |
199 | spin_unlock(&pdrv->dynids.lock); | |
200 | ||
201 | if (retval) | |
202 | return retval; | |
203 | return count; | |
204 | } | |
2229c1fb | 205 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
0994375e | 206 | |
2229c1fb GKH |
207 | static struct attribute *pci_drv_attrs[] = { |
208 | &driver_attr_new_id.attr, | |
209 | &driver_attr_remove_id.attr, | |
210 | NULL, | |
bfb09a86 | 211 | }; |
2229c1fb | 212 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 213 | |
1da177e4 | 214 | /** |
75865858 | 215 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 216 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
217 | * @dev: the PCI device structure to match against. |
218 | * | |
1da177e4 | 219 | * Used by a driver to check whether a PCI device present in the |
75865858 | 220 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 221 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 222 | * |
8b60756a | 223 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 224 | * that a driver might want to check for. |
1da177e4 | 225 | */ |
75865858 GKH |
226 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
227 | struct pci_dev *dev) | |
1da177e4 | 228 | { |
75865858 GKH |
229 | if (ids) { |
230 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
231 | if (pci_match_one_device(ids, dev)) | |
232 | return ids; | |
233 | ids++; | |
234 | } | |
1da177e4 LT |
235 | } |
236 | return NULL; | |
237 | } | |
238 | ||
239 | /** | |
ae9608af | 240 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 241 | * @drv: the PCI driver to match against |
39ba487f | 242 | * @dev: the PCI device structure to match against |
75865858 GKH |
243 | * |
244 | * Used by a driver to check whether a PCI device present in the | |
245 | * system is in its list of supported devices. Returns the matching | |
246 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 247 | */ |
d73460d7 AB |
248 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
249 | struct pci_dev *dev) | |
75865858 | 250 | { |
75865858 | 251 | struct pci_dynid *dynid; |
1da177e4 | 252 | |
7461b60a | 253 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
254 | spin_lock(&drv->dynids.lock); |
255 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
256 | if (pci_match_one_device(&dynid->id, dev)) { | |
257 | spin_unlock(&drv->dynids.lock); | |
258 | return &dynid->id; | |
259 | } | |
1da177e4 | 260 | } |
75865858 | 261 | spin_unlock(&drv->dynids.lock); |
7461b60a RK |
262 | |
263 | return pci_match_id(drv->id_table, dev); | |
1da177e4 LT |
264 | } |
265 | ||
873392ca RR |
266 | struct drv_dev_and_id { |
267 | struct pci_driver *drv; | |
268 | struct pci_dev *dev; | |
269 | const struct pci_device_id *id; | |
270 | }; | |
271 | ||
272 | static long local_pci_probe(void *_ddi) | |
273 | { | |
274 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
275 | struct pci_dev *pci_dev = ddi->dev; |
276 | struct pci_driver *pci_drv = ddi->drv; | |
277 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
278 | int rc; |
279 | ||
967577b0 HY |
280 | /* |
281 | * Unbound PCI devices are always put in D0, regardless of | |
282 | * runtime PM status. During probe, the device is set to | |
283 | * active and the usage count is incremented. If the driver | |
284 | * supports runtime PM, it should call pm_runtime_put_noidle() | |
285 | * in its probe routine and pm_runtime_get_noresume() in its | |
286 | * remove routine. | |
f3ec4f87 | 287 | */ |
967577b0 HY |
288 | pm_runtime_get_sync(dev); |
289 | pci_dev->driver = pci_drv; | |
290 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
291 | if (!rc) |
292 | return rc; | |
293 | if (rc < 0) { | |
967577b0 HY |
294 | pci_dev->driver = NULL; |
295 | pm_runtime_put_sync(dev); | |
f92d74c1 | 296 | return rc; |
f3ec4f87 | 297 | } |
f92d74c1 SC |
298 | /* |
299 | * Probe function should return < 0 for failure, 0 for success | |
300 | * Treat values > 0 as success, but warn. | |
301 | */ | |
302 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
303 | return 0; | |
873392ca RR |
304 | } |
305 | ||
d42c6997 AK |
306 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
307 | const struct pci_device_id *id) | |
308 | { | |
873392ca RR |
309 | int error, node; |
310 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
311 | ||
12c3156f AD |
312 | /* |
313 | * Execute driver initialization on node where the device is | |
314 | * attached. This way the driver likely allocates its local memory | |
315 | * on the right node. | |
316 | */ | |
873392ca | 317 | node = dev_to_node(&dev->dev); |
12c3156f AD |
318 | |
319 | /* | |
320 | * On NUMA systems, we are likely to call a PF probe function using | |
321 | * work_on_cpu(). If that probe calls pci_enable_sriov() (which | |
322 | * adds the VF devices via pci_bus_add_device()), we may re-enter | |
323 | * this function to call the VF probe function. Calling | |
324 | * work_on_cpu() again will cause a lockdep warning. Since VFs are | |
325 | * always on the same node as the PF, we can work around this by | |
326 | * avoiding work_on_cpu() when we're already on the correct node. | |
327 | * | |
328 | * Preemption is enabled, so it's theoretically unsafe to use | |
329 | * numa_node_id(), but even if we run the probe function on the | |
330 | * wrong node, it should be functionally correct. | |
331 | */ | |
332 | if (node >= 0 && node != numa_node_id()) { | |
873392ca | 333 | int cpu; |
873392ca RR |
334 | |
335 | get_online_cpus(); | |
a70f7302 | 336 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
337 | if (cpu < nr_cpu_ids) |
338 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
339 | else | |
340 | error = local_pci_probe(&ddi); | |
341 | put_online_cpus(); | |
342 | } else | |
343 | error = local_pci_probe(&ddi); | |
12c3156f | 344 | |
d42c6997 AK |
345 | return error; |
346 | } | |
347 | ||
1da177e4 | 348 | /** |
23ea3793 | 349 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
350 | * @drv: driver to call to check if it wants the PCI device |
351 | * @pci_dev: PCI device being probed | |
f7625980 | 352 | * |
8f7020d3 | 353 | * returns 0 on success, else error. |
1da177e4 LT |
354 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
355 | */ | |
356 | static int | |
357 | __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) | |
75865858 GKH |
358 | { |
359 | const struct pci_device_id *id; | |
1da177e4 LT |
360 | int error = 0; |
361 | ||
362 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
363 | error = -ENODEV; |
364 | ||
365 | id = pci_match_device(drv, pci_dev); | |
366 | if (id) | |
d42c6997 | 367 | error = pci_call_probe(drv, pci_dev, id); |
967577b0 | 368 | if (error >= 0) |
75865858 | 369 | error = 0; |
1da177e4 LT |
370 | } |
371 | return error; | |
372 | } | |
373 | ||
374 | static int pci_device_probe(struct device * dev) | |
375 | { | |
376 | int error = 0; | |
377 | struct pci_driver *drv; | |
378 | struct pci_dev *pci_dev; | |
379 | ||
380 | drv = to_pci_driver(dev->driver); | |
381 | pci_dev = to_pci_dev(dev); | |
382 | pci_dev_get(pci_dev); | |
383 | error = __pci_device_probe(drv, pci_dev); | |
384 | if (error) | |
385 | pci_dev_put(pci_dev); | |
386 | ||
387 | return error; | |
388 | } | |
389 | ||
390 | static int pci_device_remove(struct device * dev) | |
391 | { | |
392 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
393 | struct pci_driver * drv = pci_dev->driver; | |
394 | ||
395 | if (drv) { | |
f3ec4f87 AS |
396 | if (drv->remove) { |
397 | pm_runtime_get_sync(dev); | |
1da177e4 | 398 | drv->remove(pci_dev); |
f3ec4f87 AS |
399 | pm_runtime_put_noidle(dev); |
400 | } | |
1da177e4 LT |
401 | pci_dev->driver = NULL; |
402 | } | |
403 | ||
f3ec4f87 | 404 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 405 | pm_runtime_put_sync(dev); |
f3ec4f87 | 406 | |
2449e06a SL |
407 | /* |
408 | * If the device is still on, set the power state as "unknown", | |
409 | * since it might change by the next time we load the driver. | |
410 | */ | |
411 | if (pci_dev->current_state == PCI_D0) | |
412 | pci_dev->current_state = PCI_UNKNOWN; | |
413 | ||
1da177e4 LT |
414 | /* |
415 | * We would love to complain here if pci_dev->is_enabled is set, that | |
416 | * the driver should have called pci_disable_device(), but the | |
417 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 418 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
419 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
420 | * horrible the crap we have to deal with is when we are awake... | |
421 | */ | |
422 | ||
423 | pci_dev_put(pci_dev); | |
424 | return 0; | |
425 | } | |
426 | ||
bbb44d9f RW |
427 | static void pci_device_shutdown(struct device *dev) |
428 | { | |
429 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
430 | struct pci_driver *drv = pci_dev->driver; | |
431 | ||
3ff2de9b HY |
432 | pm_runtime_resume(dev); |
433 | ||
bbb44d9f RW |
434 | if (drv && drv->shutdown) |
435 | drv->shutdown(pci_dev); | |
436 | pci_msi_shutdown(pci_dev); | |
437 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 438 | |
4fc9bbf9 | 439 | #ifdef CONFIG_KEXEC |
b566a22c | 440 | /* |
4fc9bbf9 KA |
441 | * If this is a kexec reboot, turn off Bus Master bit on the |
442 | * device to tell it to not continue to do DMA. Don't touch | |
443 | * devices in D3cold or unknown states. | |
444 | * If it is not a kexec reboot, firmware will hit the PCI | |
445 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 446 | */ |
4fc9bbf9 | 447 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 448 | pci_clear_master(pci_dev); |
4fc9bbf9 | 449 | #endif |
bbb44d9f RW |
450 | } |
451 | ||
aa338601 | 452 | #ifdef CONFIG_PM |
6cbf8214 RW |
453 | |
454 | /* Auxiliary functions used for system resume and run-time resume. */ | |
455 | ||
456 | /** | |
457 | * pci_restore_standard_config - restore standard config registers of PCI device | |
458 | * @pci_dev: PCI device to handle | |
459 | */ | |
460 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
461 | { | |
462 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
463 | ||
464 | if (pci_dev->current_state != PCI_D0) { | |
465 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
466 | if (error) | |
467 | return error; | |
468 | } | |
469 | ||
1d3c16a8 JM |
470 | pci_restore_state(pci_dev); |
471 | return 0; | |
6cbf8214 RW |
472 | } |
473 | ||
db288c9c RW |
474 | #endif |
475 | ||
476 | #ifdef CONFIG_PM_SLEEP | |
477 | ||
6cbf8214 RW |
478 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
479 | { | |
db288c9c RW |
480 | pci_power_up(pci_dev); |
481 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
482 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
483 | } | |
484 | ||
fa58d305 RW |
485 | /* |
486 | * Default "suspend" method for devices that have no driver provided suspend, | |
487 | * or not even a driver at all (second part). | |
bbb44d9f | 488 | */ |
bb808945 | 489 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 490 | { |
bbb44d9f RW |
491 | /* |
492 | * mark its power state as "unknown", since we don't know if | |
493 | * e.g. the BIOS will change its device state when we suspend. | |
494 | */ | |
495 | if (pci_dev->current_state == PCI_D0) | |
496 | pci_dev->current_state = PCI_UNKNOWN; | |
497 | } | |
498 | ||
355a72d7 RW |
499 | /* |
500 | * Default "resume" method for devices that have no driver provided resume, | |
501 | * or not even a driver at all (second part). | |
502 | */ | |
bb808945 | 503 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
504 | { |
505 | int retval; | |
506 | ||
bbb44d9f RW |
507 | /* if the device was enabled before suspend, reenable */ |
508 | retval = pci_reenable_device(pci_dev); | |
509 | /* | |
510 | * if the device was busmaster before the suspend, make it busmaster | |
511 | * again | |
512 | */ | |
513 | if (pci_dev->is_busmaster) | |
514 | pci_set_master(pci_dev); | |
515 | ||
516 | return retval; | |
517 | } | |
518 | ||
519 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 LT |
520 | { |
521 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
522 | struct pci_driver * drv = pci_dev->driver; | |
46939f8b | 523 | |
02669492 | 524 | if (drv && drv->suspend) { |
99dadce8 | 525 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 526 | int error; |
aa8c6c93 | 527 | |
57ef8026 FP |
528 | error = drv->suspend(pci_dev, state); |
529 | suspend_report_result(drv->suspend, error); | |
530 | if (error) | |
531 | return error; | |
aa8c6c93 | 532 | |
46939f8b | 533 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
534 | && pci_dev->current_state != PCI_UNKNOWN) { |
535 | WARN_ONCE(pci_dev->current_state != prev, | |
536 | "PCI PM: Device state not saved by %pF\n", | |
537 | drv->suspend); | |
99dadce8 | 538 | } |
02669492 | 539 | } |
ad8cfa1d RW |
540 | |
541 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
542 | ||
46939f8b | 543 | return 0; |
1da177e4 LT |
544 | } |
545 | ||
bbb44d9f | 546 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb LT |
547 | { |
548 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
549 | struct pci_driver * drv = pci_dev->driver; | |
cbd69dbb LT |
550 | |
551 | if (drv && drv->suspend_late) { | |
46939f8b RW |
552 | pci_power_t prev = pci_dev->current_state; |
553 | int error; | |
554 | ||
57ef8026 FP |
555 | error = drv->suspend_late(pci_dev, state); |
556 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
557 | if (error) |
558 | return error; | |
559 | ||
560 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
561 | && pci_dev->current_state != PCI_UNKNOWN) { | |
562 | WARN_ONCE(pci_dev->current_state != prev, | |
563 | "PCI PM: Device state not saved by %pF\n", | |
564 | drv->suspend_late); | |
565 | return 0; | |
566 | } | |
cbd69dbb | 567 | } |
46939f8b RW |
568 | |
569 | if (!pci_dev->state_saved) | |
570 | pci_save_state(pci_dev); | |
571 | ||
572 | pci_pm_set_unknown_state(pci_dev); | |
573 | ||
574 | return 0; | |
cbd69dbb | 575 | } |
1da177e4 | 576 | |
f6dc1e5e RW |
577 | static int pci_legacy_resume_early(struct device *dev) |
578 | { | |
f6dc1e5e RW |
579 | struct pci_dev * pci_dev = to_pci_dev(dev); |
580 | struct pci_driver * drv = pci_dev->driver; | |
581 | ||
aa8c6c93 RW |
582 | return drv && drv->resume_early ? |
583 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
584 | } |
585 | ||
bbb44d9f | 586 | static int pci_legacy_resume(struct device *dev) |
1da177e4 LT |
587 | { |
588 | struct pci_dev * pci_dev = to_pci_dev(dev); | |
589 | struct pci_driver * drv = pci_dev->driver; | |
590 | ||
ad8cfa1d RW |
591 | pci_fixup_device(pci_fixup_resume, pci_dev); |
592 | ||
aa8c6c93 RW |
593 | return drv && drv->resume ? |
594 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
595 | } |
596 | ||
571ff758 RW |
597 | /* Auxiliary functions used by the new power management framework */ |
598 | ||
5294e256 | 599 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 600 | { |
73410429 RW |
601 | pci_fixup_device(pci_fixup_resume, pci_dev); |
602 | ||
5294e256 RW |
603 | if (!pci_is_bridge(pci_dev)) |
604 | pci_enable_wake(pci_dev, PCI_D0, false); | |
571ff758 RW |
605 | } |
606 | ||
5294e256 | 607 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 608 | { |
5294e256 | 609 | /* Disable non-bridge devices without PM support */ |
cbbc2f6b RW |
610 | if (!pci_is_bridge(pci_dev)) |
611 | pci_disable_enabled_device(pci_dev); | |
73410429 RW |
612 | } |
613 | ||
07e836e8 RW |
614 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
615 | { | |
616 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 617 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 618 | || drv->resume_early); |
bb808945 RW |
619 | |
620 | /* | |
621 | * Legacy PM support is used by default, so warn if the new framework is | |
622 | * supported as well. Drivers are supposed to support either the | |
623 | * former, or the latter, but not both at the same time. | |
624 | */ | |
82440a82 DF |
625 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
626 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
627 | |
628 | return ret; | |
07e836e8 RW |
629 | } |
630 | ||
571ff758 RW |
631 | /* New power management framework */ |
632 | ||
bbb44d9f RW |
633 | static int pci_pm_prepare(struct device *dev) |
634 | { | |
635 | struct device_driver *drv = dev->driver; | |
636 | int error = 0; | |
637 | ||
6cbf8214 | 638 | /* |
7cd0602d RW |
639 | * Devices having power.ignore_children set may still be necessary for |
640 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 641 | */ |
7cd0602d RW |
642 | if (dev->power.ignore_children) |
643 | pm_runtime_resume(dev); | |
6cbf8214 | 644 | |
bbb44d9f RW |
645 | if (drv && drv->pm && drv->pm->prepare) |
646 | error = drv->pm->prepare(dev); | |
647 | ||
648 | return error; | |
649 | } | |
650 | ||
bbb44d9f | 651 | |
6cbf8214 RW |
652 | #else /* !CONFIG_PM_SLEEP */ |
653 | ||
654 | #define pci_pm_prepare NULL | |
6cbf8214 RW |
655 | |
656 | #endif /* !CONFIG_PM_SLEEP */ | |
657 | ||
bbb44d9f RW |
658 | #ifdef CONFIG_SUSPEND |
659 | ||
660 | static int pci_pm_suspend(struct device *dev) | |
661 | { | |
662 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 663 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 664 | |
ad8cfa1d RW |
665 | if (pci_has_legacy_pm_support(pci_dev)) |
666 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 667 | |
5294e256 RW |
668 | if (!pm) { |
669 | pci_pm_default_suspend(pci_dev); | |
670 | goto Fixup; | |
671 | } | |
672 | ||
7cd0602d RW |
673 | /* |
674 | * PCI devices suspended at run time need to be resumed at this point, | |
675 | * because in general it is necessary to reconfigure them for system | |
676 | * suspend. Namely, if the device is supposed to wake up the system | |
677 | * from the sleep state, we may need to reconfigure it for this purpose. | |
678 | * In turn, if the device is not supposed to wake up the system from the | |
679 | * sleep state, we'll have to prevent it from signaling wake-up. | |
680 | */ | |
681 | pm_runtime_resume(dev); | |
682 | ||
82fee4d6 | 683 | pci_dev->state_saved = false; |
5294e256 RW |
684 | if (pm->suspend) { |
685 | pci_power_t prev = pci_dev->current_state; | |
686 | int error; | |
687 | ||
ddb7c9d2 RW |
688 | error = pm->suspend(dev); |
689 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
690 | if (error) |
691 | return error; | |
692 | ||
46939f8b | 693 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
694 | && pci_dev->current_state != PCI_UNKNOWN) { |
695 | WARN_ONCE(pci_dev->current_state != prev, | |
696 | "PCI PM: State of device not saved by %pF\n", | |
697 | pm->suspend); | |
5294e256 | 698 | } |
bbb44d9f | 699 | } |
fa58d305 | 700 | |
5294e256 RW |
701 | Fixup: |
702 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
703 | ||
704 | return 0; | |
bbb44d9f RW |
705 | } |
706 | ||
707 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 708 | { |
355a72d7 | 709 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 710 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 711 | |
bb808945 RW |
712 | if (pci_has_legacy_pm_support(pci_dev)) |
713 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
714 | ||
931ff68a RW |
715 | if (!pm) { |
716 | pci_save_state(pci_dev); | |
46939f8b | 717 | return 0; |
931ff68a | 718 | } |
46939f8b RW |
719 | |
720 | if (pm->suspend_noirq) { | |
721 | pci_power_t prev = pci_dev->current_state; | |
722 | int error; | |
723 | ||
724 | error = pm->suspend_noirq(dev); | |
725 | suspend_report_result(pm->suspend_noirq, error); | |
726 | if (error) | |
727 | return error; | |
728 | ||
729 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
730 | && pci_dev->current_state != PCI_UNKNOWN) { | |
731 | WARN_ONCE(pci_dev->current_state != prev, | |
732 | "PCI PM: State of device not saved by %pF\n", | |
733 | pm->suspend_noirq); | |
734 | return 0; | |
735 | } | |
bbb44d9f RW |
736 | } |
737 | ||
46939f8b RW |
738 | if (!pci_dev->state_saved) { |
739 | pci_save_state(pci_dev); | |
740 | if (!pci_is_bridge(pci_dev)) | |
741 | pci_prepare_to_sleep(pci_dev); | |
742 | } | |
d67e37d7 | 743 | |
46939f8b RW |
744 | pci_pm_set_unknown_state(pci_dev); |
745 | ||
dbf0e4c7 AS |
746 | /* |
747 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
748 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
749 | * hasn't been quiesced and tries to turn it off. If the controller | |
750 | * is already in D3, this can hang or cause memory corruption. | |
751 | * | |
752 | * Since the value of the COMMAND register doesn't matter once the | |
753 | * device has been suspended, we can safely set it to 0 here. | |
754 | */ | |
755 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
756 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
757 | ||
46939f8b | 758 | return 0; |
c8958177 | 759 | } |
1da177e4 | 760 | |
f6dc1e5e | 761 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
762 | { |
763 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
764 | struct device_driver *drv = dev->driver; | |
355a72d7 | 765 | int error = 0; |
bbb44d9f | 766 | |
6cbf8214 | 767 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 768 | |
ad8cfa1d | 769 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 770 | return pci_legacy_resume_early(dev); |
bb808945 | 771 | |
f6dc1e5e RW |
772 | if (drv && drv->pm && drv->pm->resume_noirq) |
773 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
774 | |
775 | return error; | |
776 | } | |
777 | ||
f6dc1e5e | 778 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 779 | { |
355a72d7 | 780 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 781 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
782 | int error = 0; |
783 | ||
418e4da3 RW |
784 | /* |
785 | * This is necessary for the suspend error path in which resume is | |
786 | * called without restoring the standard config registers of the device. | |
787 | */ | |
788 | if (pci_dev->state_saved) | |
789 | pci_restore_standard_config(pci_dev); | |
790 | ||
ad8cfa1d | 791 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 792 | return pci_legacy_resume(dev); |
bb808945 | 793 | |
5294e256 | 794 | pci_pm_default_resume(pci_dev); |
73410429 | 795 | |
5294e256 RW |
796 | if (pm) { |
797 | if (pm->resume) | |
798 | error = pm->resume(dev); | |
799 | } else { | |
800 | pci_pm_reenable_device(pci_dev); | |
801 | } | |
bbb44d9f | 802 | |
999cce4a | 803 | return error; |
bbb44d9f RW |
804 | } |
805 | ||
806 | #else /* !CONFIG_SUSPEND */ | |
807 | ||
808 | #define pci_pm_suspend NULL | |
809 | #define pci_pm_suspend_noirq NULL | |
810 | #define pci_pm_resume NULL | |
811 | #define pci_pm_resume_noirq NULL | |
812 | ||
813 | #endif /* !CONFIG_SUSPEND */ | |
814 | ||
1f112cee | 815 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 816 | |
699c1985 SO |
817 | |
818 | /* | |
819 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
820 | * a hibernate transition | |
821 | */ | |
822 | struct dev_pm_ops __weak pcibios_pm_ops; | |
823 | ||
bbb44d9f RW |
824 | static int pci_pm_freeze(struct device *dev) |
825 | { | |
826 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 827 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 828 | |
ad8cfa1d RW |
829 | if (pci_has_legacy_pm_support(pci_dev)) |
830 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 831 | |
5294e256 RW |
832 | if (!pm) { |
833 | pci_pm_default_suspend(pci_dev); | |
834 | return 0; | |
bbb44d9f RW |
835 | } |
836 | ||
7cd0602d RW |
837 | /* |
838 | * This used to be done in pci_pm_prepare() for all devices and some | |
839 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
840 | * devices should not be touched during freeze/thaw transitions, | |
841 | * however. | |
842 | */ | |
843 | pm_runtime_resume(dev); | |
844 | ||
82fee4d6 | 845 | pci_dev->state_saved = false; |
5294e256 RW |
846 | if (pm->freeze) { |
847 | int error; | |
848 | ||
849 | error = pm->freeze(dev); | |
850 | suspend_report_result(pm->freeze, error); | |
851 | if (error) | |
852 | return error; | |
853 | } | |
854 | ||
699c1985 SO |
855 | if (pcibios_pm_ops.freeze) |
856 | return pcibios_pm_ops.freeze(dev); | |
857 | ||
5294e256 | 858 | return 0; |
bbb44d9f RW |
859 | } |
860 | ||
861 | static int pci_pm_freeze_noirq(struct device *dev) | |
862 | { | |
355a72d7 | 863 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 864 | struct device_driver *drv = dev->driver; |
bbb44d9f | 865 | |
bb808945 RW |
866 | if (pci_has_legacy_pm_support(pci_dev)) |
867 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
868 | ||
d67e37d7 | 869 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
870 | int error; |
871 | ||
d67e37d7 RW |
872 | error = drv->pm->freeze_noirq(dev); |
873 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
874 | if (error) |
875 | return error; | |
bbb44d9f RW |
876 | } |
877 | ||
46939f8b RW |
878 | if (!pci_dev->state_saved) |
879 | pci_save_state(pci_dev); | |
d67e37d7 | 880 | |
46939f8b RW |
881 | pci_pm_set_unknown_state(pci_dev); |
882 | ||
699c1985 SO |
883 | if (pcibios_pm_ops.freeze_noirq) |
884 | return pcibios_pm_ops.freeze_noirq(dev); | |
885 | ||
46939f8b | 886 | return 0; |
bbb44d9f RW |
887 | } |
888 | ||
f6dc1e5e | 889 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 890 | { |
355a72d7 | 891 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
892 | struct device_driver *drv = dev->driver; |
893 | int error = 0; | |
894 | ||
699c1985 SO |
895 | if (pcibios_pm_ops.thaw_noirq) { |
896 | error = pcibios_pm_ops.thaw_noirq(dev); | |
897 | if (error) | |
898 | return error; | |
899 | } | |
900 | ||
ad8cfa1d | 901 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 902 | return pci_legacy_resume_early(dev); |
bb808945 | 903 | |
f6dc1e5e | 904 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 905 | |
f6dc1e5e RW |
906 | if (drv && drv->pm && drv->pm->thaw_noirq) |
907 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
908 | |
909 | return error; | |
910 | } | |
911 | ||
f6dc1e5e | 912 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 913 | { |
355a72d7 | 914 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 915 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
916 | int error = 0; |
917 | ||
699c1985 SO |
918 | if (pcibios_pm_ops.thaw) { |
919 | error = pcibios_pm_ops.thaw(dev); | |
920 | if (error) | |
921 | return error; | |
922 | } | |
923 | ||
ad8cfa1d | 924 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 925 | return pci_legacy_resume(dev); |
bb808945 | 926 | |
5294e256 RW |
927 | if (pm) { |
928 | if (pm->thaw) | |
929 | error = pm->thaw(dev); | |
930 | } else { | |
931 | pci_pm_reenable_device(pci_dev); | |
932 | } | |
bbb44d9f | 933 | |
4b77b0a2 RW |
934 | pci_dev->state_saved = false; |
935 | ||
bbb44d9f RW |
936 | return error; |
937 | } | |
938 | ||
939 | static int pci_pm_poweroff(struct device *dev) | |
940 | { | |
355a72d7 | 941 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 942 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 943 | |
ad8cfa1d RW |
944 | if (pci_has_legacy_pm_support(pci_dev)) |
945 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 946 | |
5294e256 RW |
947 | if (!pm) { |
948 | pci_pm_default_suspend(pci_dev); | |
949 | goto Fixup; | |
950 | } | |
951 | ||
7cd0602d RW |
952 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
953 | pm_runtime_resume(dev); | |
954 | ||
82fee4d6 | 955 | pci_dev->state_saved = false; |
5294e256 | 956 | if (pm->poweroff) { |
46939f8b RW |
957 | int error; |
958 | ||
ddb7c9d2 RW |
959 | error = pm->poweroff(dev); |
960 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
961 | if (error) |
962 | return error; | |
bbb44d9f RW |
963 | } |
964 | ||
5294e256 RW |
965 | Fixup: |
966 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 967 | |
699c1985 SO |
968 | if (pcibios_pm_ops.poweroff) |
969 | return pcibios_pm_ops.poweroff(dev); | |
970 | ||
46939f8b | 971 | return 0; |
bbb44d9f RW |
972 | } |
973 | ||
974 | static int pci_pm_poweroff_noirq(struct device *dev) | |
975 | { | |
46939f8b | 976 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 977 | struct device_driver *drv = dev->driver; |
bbb44d9f | 978 | |
bb808945 RW |
979 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
980 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
981 | ||
46939f8b RW |
982 | if (!drv || !drv->pm) |
983 | return 0; | |
984 | ||
985 | if (drv->pm->poweroff_noirq) { | |
986 | int error; | |
987 | ||
d67e37d7 RW |
988 | error = drv->pm->poweroff_noirq(dev); |
989 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
990 | if (error) |
991 | return error; | |
bbb44d9f RW |
992 | } |
993 | ||
46939f8b RW |
994 | if (!pci_dev->state_saved && !pci_is_bridge(pci_dev)) |
995 | pci_prepare_to_sleep(pci_dev); | |
996 | ||
0b68c8e2 RW |
997 | /* |
998 | * The reason for doing this here is the same as for the analogous code | |
999 | * in pci_pm_suspend_noirq(). | |
1000 | */ | |
1001 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1002 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1003 | ||
699c1985 SO |
1004 | if (pcibios_pm_ops.poweroff_noirq) |
1005 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1006 | ||
46939f8b | 1007 | return 0; |
bbb44d9f RW |
1008 | } |
1009 | ||
f6dc1e5e | 1010 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1011 | { |
1012 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1013 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1014 | int error = 0; |
bbb44d9f | 1015 | |
699c1985 SO |
1016 | if (pcibios_pm_ops.restore_noirq) { |
1017 | error = pcibios_pm_ops.restore_noirq(dev); | |
1018 | if (error) | |
1019 | return error; | |
1020 | } | |
1021 | ||
6cbf8214 | 1022 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1023 | |
ad8cfa1d | 1024 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1025 | return pci_legacy_resume_early(dev); |
bb808945 | 1026 | |
f6dc1e5e RW |
1027 | if (drv && drv->pm && drv->pm->restore_noirq) |
1028 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1029 | |
1030 | return error; | |
1031 | } | |
1032 | ||
f6dc1e5e | 1033 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1034 | { |
1035 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1036 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1037 | int error = 0; |
1038 | ||
699c1985 SO |
1039 | if (pcibios_pm_ops.restore) { |
1040 | error = pcibios_pm_ops.restore(dev); | |
1041 | if (error) | |
1042 | return error; | |
1043 | } | |
1044 | ||
418e4da3 RW |
1045 | /* |
1046 | * This is necessary for the hibernation error path in which restore is | |
1047 | * called without restoring the standard config registers of the device. | |
1048 | */ | |
1049 | if (pci_dev->state_saved) | |
1050 | pci_restore_standard_config(pci_dev); | |
1051 | ||
ad8cfa1d | 1052 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1053 | return pci_legacy_resume(dev); |
bb808945 | 1054 | |
5294e256 | 1055 | pci_pm_default_resume(pci_dev); |
73410429 | 1056 | |
5294e256 RW |
1057 | if (pm) { |
1058 | if (pm->restore) | |
1059 | error = pm->restore(dev); | |
1060 | } else { | |
1061 | pci_pm_reenable_device(pci_dev); | |
1062 | } | |
bbb44d9f RW |
1063 | |
1064 | return error; | |
c8958177 | 1065 | } |
1da177e4 | 1066 | |
1f112cee | 1067 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1068 | |
1069 | #define pci_pm_freeze NULL | |
1070 | #define pci_pm_freeze_noirq NULL | |
1071 | #define pci_pm_thaw NULL | |
1072 | #define pci_pm_thaw_noirq NULL | |
1073 | #define pci_pm_poweroff NULL | |
1074 | #define pci_pm_poweroff_noirq NULL | |
1075 | #define pci_pm_restore NULL | |
1076 | #define pci_pm_restore_noirq NULL | |
1077 | ||
1f112cee | 1078 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1079 | |
6cbf8214 RW |
1080 | #ifdef CONFIG_PM_RUNTIME |
1081 | ||
1082 | static int pci_pm_runtime_suspend(struct device *dev) | |
1083 | { | |
1084 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1085 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1086 | pci_power_t prev = pci_dev->current_state; | |
1087 | int error; | |
1088 | ||
967577b0 HY |
1089 | /* |
1090 | * If pci_dev->driver is not set (unbound), the device should | |
1091 | * always remain in D0 regardless of the runtime PM status | |
1092 | */ | |
1093 | if (!pci_dev->driver) | |
1094 | return 0; | |
1095 | ||
6cbf8214 RW |
1096 | if (!pm || !pm->runtime_suspend) |
1097 | return -ENOSYS; | |
1098 | ||
82fee4d6 | 1099 | pci_dev->state_saved = false; |
448bd857 | 1100 | pci_dev->no_d3cold = false; |
6cbf8214 RW |
1101 | error = pm->runtime_suspend(dev); |
1102 | suspend_report_result(pm->runtime_suspend, error); | |
1103 | if (error) | |
1104 | return error; | |
448bd857 HY |
1105 | if (!pci_dev->d3cold_allowed) |
1106 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1107 | |
1108 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1109 | ||
1110 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1111 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1112 | WARN_ONCE(pci_dev->current_state != prev, | |
1113 | "PCI PM: State of device not saved by %pF\n", | |
1114 | pm->runtime_suspend); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
42eca230 | 1118 | if (!pci_dev->state_saved) { |
6cbf8214 | 1119 | pci_save_state(pci_dev); |
42eca230 DA |
1120 | pci_finish_runtime_suspend(pci_dev); |
1121 | } | |
6cbf8214 RW |
1122 | |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static int pci_pm_runtime_resume(struct device *dev) | |
1127 | { | |
448bd857 | 1128 | int rc; |
6cbf8214 RW |
1129 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1130 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1131 | ||
967577b0 HY |
1132 | /* |
1133 | * If pci_dev->driver is not set (unbound), the device should | |
1134 | * always remain in D0 regardless of the runtime PM status | |
1135 | */ | |
1136 | if (!pci_dev->driver) | |
1137 | return 0; | |
1138 | ||
6cbf8214 RW |
1139 | if (!pm || !pm->runtime_resume) |
1140 | return -ENOSYS; | |
1141 | ||
db288c9c RW |
1142 | pci_restore_standard_config(pci_dev); |
1143 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1144 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1145 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1146 | ||
448bd857 HY |
1147 | rc = pm->runtime_resume(dev); |
1148 | ||
1149 | pci_dev->runtime_d3cold = false; | |
1150 | ||
1151 | return rc; | |
6cbf8214 RW |
1152 | } |
1153 | ||
1154 | static int pci_pm_runtime_idle(struct device *dev) | |
1155 | { | |
967577b0 | 1156 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1157 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1158 | int ret = 0; |
6cbf8214 | 1159 | |
967577b0 HY |
1160 | /* |
1161 | * If pci_dev->driver is not set (unbound), the device should | |
1162 | * always remain in D0 regardless of the runtime PM status | |
1163 | */ | |
1164 | if (!pci_dev->driver) | |
45f0a85c | 1165 | return 0; |
967577b0 | 1166 | |
6cbf8214 RW |
1167 | if (!pm) |
1168 | return -ENOSYS; | |
1169 | ||
45f0a85c RW |
1170 | if (pm->runtime_idle) |
1171 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1172 | |
45f0a85c | 1173 | return ret; |
6cbf8214 RW |
1174 | } |
1175 | ||
1176 | #else /* !CONFIG_PM_RUNTIME */ | |
1177 | ||
1178 | #define pci_pm_runtime_suspend NULL | |
1179 | #define pci_pm_runtime_resume NULL | |
1180 | #define pci_pm_runtime_idle NULL | |
1181 | ||
1182 | #endif /* !CONFIG_PM_RUNTIME */ | |
1183 | ||
aa338601 | 1184 | #ifdef CONFIG_PM |
6cbf8214 | 1185 | |
f91da04d | 1186 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1187 | .prepare = pci_pm_prepare, |
adf09493 RW |
1188 | .suspend = pci_pm_suspend, |
1189 | .resume = pci_pm_resume, | |
1190 | .freeze = pci_pm_freeze, | |
1191 | .thaw = pci_pm_thaw, | |
1192 | .poweroff = pci_pm_poweroff, | |
1193 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1194 | .suspend_noirq = pci_pm_suspend_noirq, |
1195 | .resume_noirq = pci_pm_resume_noirq, | |
1196 | .freeze_noirq = pci_pm_freeze_noirq, | |
1197 | .thaw_noirq = pci_pm_thaw_noirq, | |
1198 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1199 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1200 | .runtime_suspend = pci_pm_runtime_suspend, |
1201 | .runtime_resume = pci_pm_runtime_resume, | |
1202 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1203 | }; |
1204 | ||
adf09493 | 1205 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1206 | |
6cbf8214 | 1207 | #else /* !COMFIG_PM_OPS */ |
bbb44d9f RW |
1208 | |
1209 | #define PCI_PM_OPS_PTR NULL | |
1210 | ||
6cbf8214 | 1211 | #endif /* !COMFIG_PM_OPS */ |
bbb44d9f | 1212 | |
1da177e4 | 1213 | /** |
863b18f4 | 1214 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1215 | * @drv: the driver structure to register |
863b18f4 | 1216 | * @owner: owner module of drv |
f95d882d | 1217 | * @mod_name: module name string |
f7625980 | 1218 | * |
1da177e4 | 1219 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1220 | * Returns a negative value on error, otherwise 0. |
1221 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1222 | * no device was claimed during registration. |
1223 | */ | |
725522b5 GKH |
1224 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1225 | const char *mod_name) | |
1da177e4 | 1226 | { |
1da177e4 LT |
1227 | /* initialize common driver fields */ |
1228 | drv->driver.name = drv->name; | |
1229 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1230 | drv->driver.owner = owner; |
725522b5 | 1231 | drv->driver.mod_name = mod_name; |
50b00755 | 1232 | |
75865858 GKH |
1233 | spin_lock_init(&drv->dynids.lock); |
1234 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1235 | |
1236 | /* register with core */ | |
bfb09a86 | 1237 | return driver_register(&drv->driver); |
1da177e4 LT |
1238 | } |
1239 | ||
1240 | /** | |
1241 | * pci_unregister_driver - unregister a pci driver | |
1242 | * @drv: the driver structure to unregister | |
f7625980 | 1243 | * |
1da177e4 LT |
1244 | * Deletes the driver structure from the list of registered PCI drivers, |
1245 | * gives it a chance to clean up by calling its remove() function for | |
1246 | * each device it was responsible for, and marks those devices as | |
1247 | * driverless. | |
1248 | */ | |
1249 | ||
1250 | void | |
1251 | pci_unregister_driver(struct pci_driver *drv) | |
1252 | { | |
1253 | driver_unregister(&drv->driver); | |
1254 | pci_free_dynids(drv); | |
1255 | } | |
1256 | ||
1257 | static struct pci_driver pci_compat_driver = { | |
1258 | .name = "compat" | |
1259 | }; | |
1260 | ||
1261 | /** | |
1262 | * pci_dev_driver - get the pci_driver of a device | |
1263 | * @dev: the device to query | |
1264 | * | |
f7625980 | 1265 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1266 | * registered driver for the device. |
1267 | */ | |
1268 | struct pci_driver * | |
1269 | pci_dev_driver(const struct pci_dev *dev) | |
1270 | { | |
1271 | if (dev->driver) | |
1272 | return dev->driver; | |
1273 | else { | |
1274 | int i; | |
1275 | for(i=0; i<=PCI_ROM_RESOURCE; i++) | |
1276 | if (dev->resource[i].flags & IORESOURCE_BUSY) | |
1277 | return &pci_compat_driver; | |
1278 | } | |
1279 | return NULL; | |
1280 | } | |
1281 | ||
1282 | /** | |
1283 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1284 | * @dev: the PCI device structure to match against |
8f7020d3 | 1285 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1286 | * |
1da177e4 | 1287 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1288 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1289 | * pci_device_id structure or %NULL if there is no match. |
1290 | */ | |
75865858 | 1291 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1292 | { |
75865858 | 1293 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1294 | struct pci_driver *pci_drv; |
1da177e4 LT |
1295 | const struct pci_device_id *found_id; |
1296 | ||
58d9a38f YL |
1297 | if (!pci_dev->match_driver) |
1298 | return 0; | |
1299 | ||
1300 | pci_drv = to_pci_driver(drv); | |
75865858 | 1301 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1302 | if (found_id) |
1303 | return 1; | |
1304 | ||
75865858 | 1305 | return 0; |
1da177e4 LT |
1306 | } |
1307 | ||
1308 | /** | |
1309 | * pci_dev_get - increments the reference count of the pci device structure | |
1310 | * @dev: the device being referenced | |
1311 | * | |
1312 | * Each live reference to a device should be refcounted. | |
1313 | * | |
1314 | * Drivers for PCI devices should normally record such references in | |
1315 | * their probe() methods, when they bind to a device, and release | |
1316 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1317 | * | |
1318 | * A pointer to the device with the incremented reference counter is returned. | |
1319 | */ | |
1320 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1321 | { | |
1322 | if (dev) | |
1323 | get_device(&dev->dev); | |
1324 | return dev; | |
1325 | } | |
1326 | ||
1327 | /** | |
1328 | * pci_dev_put - release a use of the pci device structure | |
1329 | * @dev: device that's been disconnected | |
1330 | * | |
1331 | * Must be called when a user of a device is finished with it. When the last | |
1332 | * user of the device calls this function, the memory of the device is freed. | |
1333 | */ | |
1334 | void pci_dev_put(struct pci_dev *dev) | |
1335 | { | |
1336 | if (dev) | |
1337 | put_device(&dev->dev); | |
1338 | } | |
1339 | ||
8ccc9aa1 BP |
1340 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1341 | { | |
1342 | struct pci_dev *pdev; | |
1343 | ||
1344 | if (!dev) | |
1345 | return -ENODEV; | |
1346 | ||
1347 | pdev = to_pci_dev(dev); | |
1348 | if (!pdev) | |
1349 | return -ENODEV; | |
1350 | ||
1351 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1352 | return -ENOMEM; | |
1353 | ||
1354 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1355 | return -ENOMEM; | |
1356 | ||
1357 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1358 | pdev->subsystem_device)) | |
1359 | return -ENOMEM; | |
1360 | ||
1361 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1362 | return -ENOMEM; | |
1363 | ||
1364 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x", | |
1365 | pdev->vendor, pdev->device, | |
1366 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1367 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1368 | (u8)(pdev->class))) | |
1369 | return -ENOMEM; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
1da177e4 LT |
1373 | struct bus_type pci_bus_type = { |
1374 | .name = "pci", | |
1375 | .match = pci_bus_match, | |
312c004d | 1376 | .uevent = pci_uevent, |
b15d686a RK |
1377 | .probe = pci_device_probe, |
1378 | .remove = pci_device_remove, | |
cbd69dbb | 1379 | .shutdown = pci_device_shutdown, |
5136b2da | 1380 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1381 | .bus_groups = pci_bus_groups, |
2229c1fb | 1382 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1383 | .pm = PCI_PM_OPS_PTR, |
1da177e4 LT |
1384 | }; |
1385 | ||
1386 | static int __init pci_driver_init(void) | |
1387 | { | |
1388 | return bus_register(&pci_bus_type); | |
1389 | } | |
1390 | ||
1391 | postcore_initcall(pci_driver_init); | |
1392 | ||
9dba910e | 1393 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
75865858 | 1394 | EXPORT_SYMBOL(pci_match_id); |
863b18f4 | 1395 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1396 | EXPORT_SYMBOL(pci_unregister_driver); |
1397 | EXPORT_SYMBOL(pci_dev_driver); | |
1398 | EXPORT_SYMBOL(pci_bus_type); | |
1399 | EXPORT_SYMBOL(pci_dev_get); | |
1400 | EXPORT_SYMBOL(pci_dev_put); |