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 | } | |
b7fe9434 | 80 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
9dba910e TH |
81 | |
82 | static void pci_free_dynids(struct pci_driver *drv) | |
83 | { | |
84 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 85 | |
9dba910e TH |
86 | spin_lock(&drv->dynids.lock); |
87 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
88 | list_del(&dynid->node); | |
89 | kfree(dynid); | |
90 | } | |
91 | spin_unlock(&drv->dynids.lock); | |
92 | } | |
93 | ||
1da177e4 | 94 | /** |
9dba910e | 95 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
96 | * @driver: target device driver |
97 | * @buf: buffer for scanning device ID data | |
98 | * @count: input size | |
1da177e4 | 99 | * |
9dba910e | 100 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 101 | */ |
3c78bc61 RD |
102 | static ssize_t store_new_id(struct device_driver *driver, const char *buf, |
103 | size_t count) | |
1da177e4 | 104 | { |
1da177e4 | 105 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 106 | const struct pci_device_id *ids = pdrv->id_table; |
3c78bc61 RD |
107 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
108 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
109 | unsigned long driver_data = 0; | |
110 | int fields = 0; | |
8895d3bc | 111 | int retval = 0; |
1da177e4 | 112 | |
b41d6cf3 | 113 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
114 | &vendor, &device, &subvendor, &subdevice, |
115 | &class, &class_mask, &driver_data); | |
6ba18636 | 116 | if (fields < 2) |
1da177e4 LT |
117 | return -EINVAL; |
118 | ||
8895d3bc BD |
119 | if (fields != 7) { |
120 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
121 | if (!pdev) | |
122 | return -ENOMEM; | |
123 | ||
124 | pdev->vendor = vendor; | |
125 | pdev->device = device; | |
126 | pdev->subsystem_vendor = subvendor; | |
127 | pdev->subsystem_device = subdevice; | |
128 | pdev->class = class; | |
129 | ||
130 | if (pci_match_id(pdrv->id_table, pdev)) | |
131 | retval = -EEXIST; | |
132 | ||
133 | kfree(pdev); | |
134 | ||
135 | if (retval) | |
136 | return retval; | |
137 | } | |
138 | ||
b41d6cf3 JD |
139 | /* Only accept driver_data values that match an existing id_table |
140 | entry */ | |
2debb4d2 CW |
141 | if (ids) { |
142 | retval = -EINVAL; | |
143 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
144 | if (driver_data == ids->driver_data) { | |
145 | retval = 0; | |
146 | break; | |
147 | } | |
148 | ids++; | |
b41d6cf3 | 149 | } |
2debb4d2 CW |
150 | if (retval) /* No match */ |
151 | return retval; | |
b41d6cf3 | 152 | } |
b41d6cf3 | 153 | |
9dba910e TH |
154 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
155 | class, class_mask, driver_data); | |
b19441af GKH |
156 | if (retval) |
157 | return retval; | |
1da177e4 LT |
158 | return count; |
159 | } | |
2229c1fb | 160 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
1da177e4 | 161 | |
0994375e CW |
162 | /** |
163 | * store_remove_id - remove a PCI device ID from this driver | |
164 | * @driver: target device driver | |
165 | * @buf: buffer for scanning device ID data | |
166 | * @count: input size | |
167 | * | |
168 | * Removes a dynamic pci device ID to this driver. | |
169 | */ | |
3c78bc61 RD |
170 | static ssize_t store_remove_id(struct device_driver *driver, const char *buf, |
171 | size_t count) | |
0994375e CW |
172 | { |
173 | struct pci_dynid *dynid, *n; | |
174 | struct pci_driver *pdrv = to_pci_driver(driver); | |
175 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
176 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
177 | int fields = 0; | |
178 | int retval = -ENODEV; | |
179 | ||
180 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
181 | &vendor, &device, &subvendor, &subdevice, | |
182 | &class, &class_mask); | |
183 | if (fields < 2) | |
184 | return -EINVAL; | |
185 | ||
186 | spin_lock(&pdrv->dynids.lock); | |
187 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
188 | struct pci_device_id *id = &dynid->id; | |
189 | if ((id->vendor == vendor) && | |
190 | (id->device == device) && | |
191 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
192 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
193 | !((id->class ^ class) & class_mask)) { | |
194 | list_del(&dynid->node); | |
195 | kfree(dynid); | |
196 | retval = 0; | |
197 | break; | |
198 | } | |
199 | } | |
200 | spin_unlock(&pdrv->dynids.lock); | |
201 | ||
202 | if (retval) | |
203 | return retval; | |
204 | return count; | |
205 | } | |
2229c1fb | 206 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
0994375e | 207 | |
2229c1fb GKH |
208 | static struct attribute *pci_drv_attrs[] = { |
209 | &driver_attr_new_id.attr, | |
210 | &driver_attr_remove_id.attr, | |
211 | NULL, | |
bfb09a86 | 212 | }; |
2229c1fb | 213 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 214 | |
1da177e4 | 215 | /** |
75865858 | 216 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 217 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
218 | * @dev: the PCI device structure to match against. |
219 | * | |
1da177e4 | 220 | * Used by a driver to check whether a PCI device present in the |
75865858 | 221 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 222 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 223 | * |
8b60756a | 224 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 225 | * that a driver might want to check for. |
1da177e4 | 226 | */ |
75865858 GKH |
227 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
228 | struct pci_dev *dev) | |
1da177e4 | 229 | { |
75865858 GKH |
230 | if (ids) { |
231 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
232 | if (pci_match_one_device(ids, dev)) | |
233 | return ids; | |
234 | ids++; | |
235 | } | |
1da177e4 LT |
236 | } |
237 | return NULL; | |
238 | } | |
b7fe9434 | 239 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 240 | |
782a985d AW |
241 | static const struct pci_device_id pci_device_id_any = { |
242 | .vendor = PCI_ANY_ID, | |
243 | .device = PCI_ANY_ID, | |
244 | .subvendor = PCI_ANY_ID, | |
245 | .subdevice = PCI_ANY_ID, | |
246 | }; | |
247 | ||
1da177e4 | 248 | /** |
ae9608af | 249 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 250 | * @drv: the PCI driver to match against |
39ba487f | 251 | * @dev: the PCI device structure to match against |
75865858 GKH |
252 | * |
253 | * Used by a driver to check whether a PCI device present in the | |
254 | * system is in its list of supported devices. Returns the matching | |
255 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 256 | */ |
d73460d7 AB |
257 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
258 | struct pci_dev *dev) | |
75865858 | 259 | { |
75865858 | 260 | struct pci_dynid *dynid; |
782a985d AW |
261 | const struct pci_device_id *found_id = NULL; |
262 | ||
263 | /* When driver_override is set, only bind to the matching driver */ | |
264 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
265 | return NULL; | |
1da177e4 | 266 | |
7461b60a | 267 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
268 | spin_lock(&drv->dynids.lock); |
269 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
270 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
271 | found_id = &dynid->id; |
272 | break; | |
75865858 | 273 | } |
1da177e4 | 274 | } |
75865858 | 275 | spin_unlock(&drv->dynids.lock); |
7461b60a | 276 | |
782a985d AW |
277 | if (!found_id) |
278 | found_id = pci_match_id(drv->id_table, dev); | |
279 | ||
280 | /* driver_override will always match, send a dummy id */ | |
281 | if (!found_id && dev->driver_override) | |
282 | found_id = &pci_device_id_any; | |
283 | ||
284 | return found_id; | |
1da177e4 LT |
285 | } |
286 | ||
873392ca RR |
287 | struct drv_dev_and_id { |
288 | struct pci_driver *drv; | |
289 | struct pci_dev *dev; | |
290 | const struct pci_device_id *id; | |
291 | }; | |
292 | ||
293 | static long local_pci_probe(void *_ddi) | |
294 | { | |
295 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
296 | struct pci_dev *pci_dev = ddi->dev; |
297 | struct pci_driver *pci_drv = ddi->drv; | |
298 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
299 | int rc; |
300 | ||
967577b0 HY |
301 | /* |
302 | * Unbound PCI devices are always put in D0, regardless of | |
303 | * runtime PM status. During probe, the device is set to | |
304 | * active and the usage count is incremented. If the driver | |
305 | * supports runtime PM, it should call pm_runtime_put_noidle() | |
306 | * in its probe routine and pm_runtime_get_noresume() in its | |
307 | * remove routine. | |
f3ec4f87 | 308 | */ |
967577b0 HY |
309 | pm_runtime_get_sync(dev); |
310 | pci_dev->driver = pci_drv; | |
311 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
312 | if (!rc) |
313 | return rc; | |
314 | if (rc < 0) { | |
967577b0 HY |
315 | pci_dev->driver = NULL; |
316 | pm_runtime_put_sync(dev); | |
f92d74c1 | 317 | return rc; |
f3ec4f87 | 318 | } |
f92d74c1 SC |
319 | /* |
320 | * Probe function should return < 0 for failure, 0 for success | |
321 | * Treat values > 0 as success, but warn. | |
322 | */ | |
323 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
324 | return 0; | |
873392ca RR |
325 | } |
326 | ||
d42c6997 AK |
327 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
328 | const struct pci_device_id *id) | |
329 | { | |
873392ca RR |
330 | int error, node; |
331 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
332 | ||
12c3156f AD |
333 | /* |
334 | * Execute driver initialization on node where the device is | |
335 | * attached. This way the driver likely allocates its local memory | |
336 | * on the right node. | |
337 | */ | |
873392ca | 338 | node = dev_to_node(&dev->dev); |
12c3156f AD |
339 | |
340 | /* | |
341 | * On NUMA systems, we are likely to call a PF probe function using | |
342 | * work_on_cpu(). If that probe calls pci_enable_sriov() (which | |
343 | * adds the VF devices via pci_bus_add_device()), we may re-enter | |
344 | * this function to call the VF probe function. Calling | |
345 | * work_on_cpu() again will cause a lockdep warning. Since VFs are | |
346 | * always on the same node as the PF, we can work around this by | |
347 | * avoiding work_on_cpu() when we're already on the correct node. | |
348 | * | |
349 | * Preemption is enabled, so it's theoretically unsafe to use | |
350 | * numa_node_id(), but even if we run the probe function on the | |
351 | * wrong node, it should be functionally correct. | |
352 | */ | |
353 | if (node >= 0 && node != numa_node_id()) { | |
873392ca | 354 | int cpu; |
873392ca RR |
355 | |
356 | get_online_cpus(); | |
a70f7302 | 357 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
358 | if (cpu < nr_cpu_ids) |
359 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
360 | else | |
361 | error = local_pci_probe(&ddi); | |
362 | put_online_cpus(); | |
363 | } else | |
364 | error = local_pci_probe(&ddi); | |
12c3156f | 365 | |
d42c6997 AK |
366 | return error; |
367 | } | |
368 | ||
1da177e4 | 369 | /** |
23ea3793 | 370 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
371 | * @drv: driver to call to check if it wants the PCI device |
372 | * @pci_dev: PCI device being probed | |
f7625980 | 373 | * |
8f7020d3 | 374 | * returns 0 on success, else error. |
1da177e4 LT |
375 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
376 | */ | |
3c78bc61 | 377 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
378 | { |
379 | const struct pci_device_id *id; | |
1da177e4 LT |
380 | int error = 0; |
381 | ||
382 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
383 | error = -ENODEV; |
384 | ||
385 | id = pci_match_device(drv, pci_dev); | |
386 | if (id) | |
d42c6997 | 387 | error = pci_call_probe(drv, pci_dev, id); |
967577b0 | 388 | if (error >= 0) |
75865858 | 389 | error = 0; |
1da177e4 LT |
390 | } |
391 | return error; | |
392 | } | |
393 | ||
3c78bc61 | 394 | static int pci_device_probe(struct device *dev) |
1da177e4 LT |
395 | { |
396 | int error = 0; | |
397 | struct pci_driver *drv; | |
398 | struct pci_dev *pci_dev; | |
399 | ||
400 | drv = to_pci_driver(dev->driver); | |
401 | pci_dev = to_pci_dev(dev); | |
402 | pci_dev_get(pci_dev); | |
403 | error = __pci_device_probe(drv, pci_dev); | |
404 | if (error) | |
405 | pci_dev_put(pci_dev); | |
406 | ||
407 | return error; | |
408 | } | |
409 | ||
3c78bc61 | 410 | static int pci_device_remove(struct device *dev) |
1da177e4 | 411 | { |
3c78bc61 RD |
412 | struct pci_dev *pci_dev = to_pci_dev(dev); |
413 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
414 | |
415 | if (drv) { | |
f3ec4f87 AS |
416 | if (drv->remove) { |
417 | pm_runtime_get_sync(dev); | |
1da177e4 | 418 | drv->remove(pci_dev); |
f3ec4f87 AS |
419 | pm_runtime_put_noidle(dev); |
420 | } | |
1da177e4 LT |
421 | pci_dev->driver = NULL; |
422 | } | |
423 | ||
f3ec4f87 | 424 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 425 | pm_runtime_put_sync(dev); |
f3ec4f87 | 426 | |
2449e06a SL |
427 | /* |
428 | * If the device is still on, set the power state as "unknown", | |
429 | * since it might change by the next time we load the driver. | |
430 | */ | |
431 | if (pci_dev->current_state == PCI_D0) | |
432 | pci_dev->current_state = PCI_UNKNOWN; | |
433 | ||
1da177e4 LT |
434 | /* |
435 | * We would love to complain here if pci_dev->is_enabled is set, that | |
436 | * the driver should have called pci_disable_device(), but the | |
437 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 438 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
439 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
440 | * horrible the crap we have to deal with is when we are awake... | |
441 | */ | |
442 | ||
443 | pci_dev_put(pci_dev); | |
444 | return 0; | |
445 | } | |
446 | ||
bbb44d9f RW |
447 | static void pci_device_shutdown(struct device *dev) |
448 | { | |
449 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
450 | struct pci_driver *drv = pci_dev->driver; | |
451 | ||
3ff2de9b HY |
452 | pm_runtime_resume(dev); |
453 | ||
bbb44d9f RW |
454 | if (drv && drv->shutdown) |
455 | drv->shutdown(pci_dev); | |
456 | pci_msi_shutdown(pci_dev); | |
457 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 458 | |
4fc9bbf9 | 459 | #ifdef CONFIG_KEXEC |
b566a22c | 460 | /* |
4fc9bbf9 KA |
461 | * If this is a kexec reboot, turn off Bus Master bit on the |
462 | * device to tell it to not continue to do DMA. Don't touch | |
463 | * devices in D3cold or unknown states. | |
464 | * If it is not a kexec reboot, firmware will hit the PCI | |
465 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 466 | */ |
4fc9bbf9 | 467 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 468 | pci_clear_master(pci_dev); |
4fc9bbf9 | 469 | #endif |
bbb44d9f RW |
470 | } |
471 | ||
aa338601 | 472 | #ifdef CONFIG_PM |
6cbf8214 RW |
473 | |
474 | /* Auxiliary functions used for system resume and run-time resume. */ | |
475 | ||
476 | /** | |
477 | * pci_restore_standard_config - restore standard config registers of PCI device | |
478 | * @pci_dev: PCI device to handle | |
479 | */ | |
480 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
481 | { | |
482 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
483 | ||
484 | if (pci_dev->current_state != PCI_D0) { | |
485 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
486 | if (error) | |
487 | return error; | |
488 | } | |
489 | ||
1d3c16a8 JM |
490 | pci_restore_state(pci_dev); |
491 | return 0; | |
6cbf8214 RW |
492 | } |
493 | ||
db288c9c RW |
494 | #endif |
495 | ||
496 | #ifdef CONFIG_PM_SLEEP | |
497 | ||
6cbf8214 RW |
498 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
499 | { | |
db288c9c RW |
500 | pci_power_up(pci_dev); |
501 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
502 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
503 | } | |
504 | ||
fa58d305 RW |
505 | /* |
506 | * Default "suspend" method for devices that have no driver provided suspend, | |
507 | * or not even a driver at all (second part). | |
bbb44d9f | 508 | */ |
bb808945 | 509 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 510 | { |
bbb44d9f RW |
511 | /* |
512 | * mark its power state as "unknown", since we don't know if | |
513 | * e.g. the BIOS will change its device state when we suspend. | |
514 | */ | |
515 | if (pci_dev->current_state == PCI_D0) | |
516 | pci_dev->current_state = PCI_UNKNOWN; | |
517 | } | |
518 | ||
355a72d7 RW |
519 | /* |
520 | * Default "resume" method for devices that have no driver provided resume, | |
521 | * or not even a driver at all (second part). | |
522 | */ | |
bb808945 | 523 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
524 | { |
525 | int retval; | |
526 | ||
bbb44d9f RW |
527 | /* if the device was enabled before suspend, reenable */ |
528 | retval = pci_reenable_device(pci_dev); | |
529 | /* | |
530 | * if the device was busmaster before the suspend, make it busmaster | |
531 | * again | |
532 | */ | |
533 | if (pci_dev->is_busmaster) | |
534 | pci_set_master(pci_dev); | |
535 | ||
536 | return retval; | |
537 | } | |
538 | ||
539 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 540 | { |
3c78bc61 RD |
541 | struct pci_dev *pci_dev = to_pci_dev(dev); |
542 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 543 | |
02669492 | 544 | if (drv && drv->suspend) { |
99dadce8 | 545 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 546 | int error; |
aa8c6c93 | 547 | |
57ef8026 FP |
548 | error = drv->suspend(pci_dev, state); |
549 | suspend_report_result(drv->suspend, error); | |
550 | if (error) | |
551 | return error; | |
aa8c6c93 | 552 | |
46939f8b | 553 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
554 | && pci_dev->current_state != PCI_UNKNOWN) { |
555 | WARN_ONCE(pci_dev->current_state != prev, | |
556 | "PCI PM: Device state not saved by %pF\n", | |
557 | drv->suspend); | |
99dadce8 | 558 | } |
02669492 | 559 | } |
ad8cfa1d RW |
560 | |
561 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
562 | ||
46939f8b | 563 | return 0; |
1da177e4 LT |
564 | } |
565 | ||
bbb44d9f | 566 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 567 | { |
3c78bc61 RD |
568 | struct pci_dev *pci_dev = to_pci_dev(dev); |
569 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
570 | |
571 | if (drv && drv->suspend_late) { | |
46939f8b RW |
572 | pci_power_t prev = pci_dev->current_state; |
573 | int error; | |
574 | ||
57ef8026 FP |
575 | error = drv->suspend_late(pci_dev, state); |
576 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
577 | if (error) |
578 | return error; | |
579 | ||
580 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
581 | && pci_dev->current_state != PCI_UNKNOWN) { | |
582 | WARN_ONCE(pci_dev->current_state != prev, | |
583 | "PCI PM: Device state not saved by %pF\n", | |
584 | drv->suspend_late); | |
7d2a01b8 | 585 | goto Fixup; |
46939f8b | 586 | } |
cbd69dbb | 587 | } |
46939f8b RW |
588 | |
589 | if (!pci_dev->state_saved) | |
590 | pci_save_state(pci_dev); | |
591 | ||
592 | pci_pm_set_unknown_state(pci_dev); | |
593 | ||
7d2a01b8 AN |
594 | Fixup: |
595 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
596 | ||
46939f8b | 597 | return 0; |
cbd69dbb | 598 | } |
1da177e4 | 599 | |
f6dc1e5e RW |
600 | static int pci_legacy_resume_early(struct device *dev) |
601 | { | |
3c78bc61 RD |
602 | struct pci_dev *pci_dev = to_pci_dev(dev); |
603 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 604 | |
aa8c6c93 RW |
605 | return drv && drv->resume_early ? |
606 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
607 | } |
608 | ||
bbb44d9f | 609 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 610 | { |
3c78bc61 RD |
611 | struct pci_dev *pci_dev = to_pci_dev(dev); |
612 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 613 | |
ad8cfa1d RW |
614 | pci_fixup_device(pci_fixup_resume, pci_dev); |
615 | ||
aa8c6c93 RW |
616 | return drv && drv->resume ? |
617 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
618 | } |
619 | ||
571ff758 RW |
620 | /* Auxiliary functions used by the new power management framework */ |
621 | ||
5294e256 | 622 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 623 | { |
73410429 RW |
624 | pci_fixup_device(pci_fixup_resume, pci_dev); |
625 | ||
326c1cda | 626 | if (!pci_has_subordinate(pci_dev)) |
5294e256 | 627 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
628 | } |
629 | ||
5294e256 | 630 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 631 | { |
5294e256 | 632 | /* Disable non-bridge devices without PM support */ |
326c1cda | 633 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 634 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
635 | } |
636 | ||
07e836e8 RW |
637 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
638 | { | |
639 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 640 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 641 | || drv->resume_early); |
bb808945 RW |
642 | |
643 | /* | |
644 | * Legacy PM support is used by default, so warn if the new framework is | |
645 | * supported as well. Drivers are supposed to support either the | |
646 | * former, or the latter, but not both at the same time. | |
647 | */ | |
82440a82 DF |
648 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
649 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
650 | |
651 | return ret; | |
07e836e8 RW |
652 | } |
653 | ||
571ff758 RW |
654 | /* New power management framework */ |
655 | ||
bbb44d9f RW |
656 | static int pci_pm_prepare(struct device *dev) |
657 | { | |
658 | struct device_driver *drv = dev->driver; | |
659 | int error = 0; | |
660 | ||
6cbf8214 | 661 | /* |
7cd0602d RW |
662 | * Devices having power.ignore_children set may still be necessary for |
663 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 664 | */ |
7cd0602d RW |
665 | if (dev->power.ignore_children) |
666 | pm_runtime_resume(dev); | |
6cbf8214 | 667 | |
bbb44d9f RW |
668 | if (drv && drv->pm && drv->pm->prepare) |
669 | error = drv->pm->prepare(dev); | |
670 | ||
671 | return error; | |
672 | } | |
673 | ||
bbb44d9f | 674 | |
6cbf8214 RW |
675 | #else /* !CONFIG_PM_SLEEP */ |
676 | ||
677 | #define pci_pm_prepare NULL | |
6cbf8214 RW |
678 | |
679 | #endif /* !CONFIG_PM_SLEEP */ | |
680 | ||
bbb44d9f RW |
681 | #ifdef CONFIG_SUSPEND |
682 | ||
683 | static int pci_pm_suspend(struct device *dev) | |
684 | { | |
685 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 686 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 687 | |
ad8cfa1d RW |
688 | if (pci_has_legacy_pm_support(pci_dev)) |
689 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 690 | |
5294e256 RW |
691 | if (!pm) { |
692 | pci_pm_default_suspend(pci_dev); | |
693 | goto Fixup; | |
694 | } | |
695 | ||
7cd0602d RW |
696 | /* |
697 | * PCI devices suspended at run time need to be resumed at this point, | |
698 | * because in general it is necessary to reconfigure them for system | |
699 | * suspend. Namely, if the device is supposed to wake up the system | |
700 | * from the sleep state, we may need to reconfigure it for this purpose. | |
701 | * In turn, if the device is not supposed to wake up the system from the | |
702 | * sleep state, we'll have to prevent it from signaling wake-up. | |
703 | */ | |
704 | pm_runtime_resume(dev); | |
705 | ||
82fee4d6 | 706 | pci_dev->state_saved = false; |
5294e256 RW |
707 | if (pm->suspend) { |
708 | pci_power_t prev = pci_dev->current_state; | |
709 | int error; | |
710 | ||
ddb7c9d2 RW |
711 | error = pm->suspend(dev); |
712 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
713 | if (error) |
714 | return error; | |
715 | ||
46939f8b | 716 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
717 | && pci_dev->current_state != PCI_UNKNOWN) { |
718 | WARN_ONCE(pci_dev->current_state != prev, | |
719 | "PCI PM: State of device not saved by %pF\n", | |
720 | pm->suspend); | |
5294e256 | 721 | } |
bbb44d9f | 722 | } |
fa58d305 | 723 | |
5294e256 RW |
724 | Fixup: |
725 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
726 | ||
727 | return 0; | |
bbb44d9f RW |
728 | } |
729 | ||
730 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 731 | { |
355a72d7 | 732 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 733 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 734 | |
bb808945 RW |
735 | if (pci_has_legacy_pm_support(pci_dev)) |
736 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
737 | ||
931ff68a RW |
738 | if (!pm) { |
739 | pci_save_state(pci_dev); | |
7d2a01b8 | 740 | goto Fixup; |
931ff68a | 741 | } |
46939f8b RW |
742 | |
743 | if (pm->suspend_noirq) { | |
744 | pci_power_t prev = pci_dev->current_state; | |
745 | int error; | |
746 | ||
747 | error = pm->suspend_noirq(dev); | |
748 | suspend_report_result(pm->suspend_noirq, error); | |
749 | if (error) | |
750 | return error; | |
751 | ||
752 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
753 | && pci_dev->current_state != PCI_UNKNOWN) { | |
754 | WARN_ONCE(pci_dev->current_state != prev, | |
755 | "PCI PM: State of device not saved by %pF\n", | |
756 | pm->suspend_noirq); | |
7d2a01b8 | 757 | goto Fixup; |
46939f8b | 758 | } |
bbb44d9f RW |
759 | } |
760 | ||
46939f8b RW |
761 | if (!pci_dev->state_saved) { |
762 | pci_save_state(pci_dev); | |
326c1cda | 763 | if (!pci_has_subordinate(pci_dev)) |
46939f8b RW |
764 | pci_prepare_to_sleep(pci_dev); |
765 | } | |
d67e37d7 | 766 | |
46939f8b RW |
767 | pci_pm_set_unknown_state(pci_dev); |
768 | ||
dbf0e4c7 AS |
769 | /* |
770 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
771 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
772 | * hasn't been quiesced and tries to turn it off. If the controller | |
773 | * is already in D3, this can hang or cause memory corruption. | |
774 | * | |
775 | * Since the value of the COMMAND register doesn't matter once the | |
776 | * device has been suspended, we can safely set it to 0 here. | |
777 | */ | |
778 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
779 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
780 | ||
7d2a01b8 AN |
781 | Fixup: |
782 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
783 | ||
46939f8b | 784 | return 0; |
c8958177 | 785 | } |
1da177e4 | 786 | |
f6dc1e5e | 787 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
788 | { |
789 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
790 | struct device_driver *drv = dev->driver; | |
355a72d7 | 791 | int error = 0; |
bbb44d9f | 792 | |
6cbf8214 | 793 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 794 | |
ad8cfa1d | 795 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 796 | return pci_legacy_resume_early(dev); |
bb808945 | 797 | |
f6dc1e5e RW |
798 | if (drv && drv->pm && drv->pm->resume_noirq) |
799 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
800 | |
801 | return error; | |
802 | } | |
803 | ||
f6dc1e5e | 804 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 805 | { |
355a72d7 | 806 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 807 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
808 | int error = 0; |
809 | ||
418e4da3 RW |
810 | /* |
811 | * This is necessary for the suspend error path in which resume is | |
812 | * called without restoring the standard config registers of the device. | |
813 | */ | |
814 | if (pci_dev->state_saved) | |
815 | pci_restore_standard_config(pci_dev); | |
816 | ||
ad8cfa1d | 817 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 818 | return pci_legacy_resume(dev); |
bb808945 | 819 | |
5294e256 | 820 | pci_pm_default_resume(pci_dev); |
73410429 | 821 | |
5294e256 RW |
822 | if (pm) { |
823 | if (pm->resume) | |
824 | error = pm->resume(dev); | |
825 | } else { | |
826 | pci_pm_reenable_device(pci_dev); | |
827 | } | |
bbb44d9f | 828 | |
999cce4a | 829 | return error; |
bbb44d9f RW |
830 | } |
831 | ||
832 | #else /* !CONFIG_SUSPEND */ | |
833 | ||
834 | #define pci_pm_suspend NULL | |
835 | #define pci_pm_suspend_noirq NULL | |
836 | #define pci_pm_resume NULL | |
837 | #define pci_pm_resume_noirq NULL | |
838 | ||
839 | #endif /* !CONFIG_SUSPEND */ | |
840 | ||
1f112cee | 841 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 842 | |
699c1985 SO |
843 | |
844 | /* | |
845 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
846 | * a hibernate transition | |
847 | */ | |
848 | struct dev_pm_ops __weak pcibios_pm_ops; | |
849 | ||
bbb44d9f RW |
850 | static int pci_pm_freeze(struct device *dev) |
851 | { | |
852 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 853 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 854 | |
ad8cfa1d RW |
855 | if (pci_has_legacy_pm_support(pci_dev)) |
856 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 857 | |
5294e256 RW |
858 | if (!pm) { |
859 | pci_pm_default_suspend(pci_dev); | |
860 | return 0; | |
bbb44d9f RW |
861 | } |
862 | ||
7cd0602d RW |
863 | /* |
864 | * This used to be done in pci_pm_prepare() for all devices and some | |
865 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
866 | * devices should not be touched during freeze/thaw transitions, | |
867 | * however. | |
868 | */ | |
869 | pm_runtime_resume(dev); | |
870 | ||
82fee4d6 | 871 | pci_dev->state_saved = false; |
5294e256 RW |
872 | if (pm->freeze) { |
873 | int error; | |
874 | ||
875 | error = pm->freeze(dev); | |
876 | suspend_report_result(pm->freeze, error); | |
877 | if (error) | |
878 | return error; | |
879 | } | |
880 | ||
699c1985 SO |
881 | if (pcibios_pm_ops.freeze) |
882 | return pcibios_pm_ops.freeze(dev); | |
883 | ||
5294e256 | 884 | return 0; |
bbb44d9f RW |
885 | } |
886 | ||
887 | static int pci_pm_freeze_noirq(struct device *dev) | |
888 | { | |
355a72d7 | 889 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 890 | struct device_driver *drv = dev->driver; |
bbb44d9f | 891 | |
bb808945 RW |
892 | if (pci_has_legacy_pm_support(pci_dev)) |
893 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
894 | ||
d67e37d7 | 895 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
896 | int error; |
897 | ||
d67e37d7 RW |
898 | error = drv->pm->freeze_noirq(dev); |
899 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
900 | if (error) |
901 | return error; | |
bbb44d9f RW |
902 | } |
903 | ||
46939f8b RW |
904 | if (!pci_dev->state_saved) |
905 | pci_save_state(pci_dev); | |
d67e37d7 | 906 | |
46939f8b RW |
907 | pci_pm_set_unknown_state(pci_dev); |
908 | ||
699c1985 SO |
909 | if (pcibios_pm_ops.freeze_noirq) |
910 | return pcibios_pm_ops.freeze_noirq(dev); | |
911 | ||
46939f8b | 912 | return 0; |
bbb44d9f RW |
913 | } |
914 | ||
f6dc1e5e | 915 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 916 | { |
355a72d7 | 917 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
918 | struct device_driver *drv = dev->driver; |
919 | int error = 0; | |
920 | ||
699c1985 SO |
921 | if (pcibios_pm_ops.thaw_noirq) { |
922 | error = pcibios_pm_ops.thaw_noirq(dev); | |
923 | if (error) | |
924 | return error; | |
925 | } | |
926 | ||
ad8cfa1d | 927 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 928 | return pci_legacy_resume_early(dev); |
bb808945 | 929 | |
f6dc1e5e | 930 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 931 | |
f6dc1e5e RW |
932 | if (drv && drv->pm && drv->pm->thaw_noirq) |
933 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
934 | |
935 | return error; | |
936 | } | |
937 | ||
f6dc1e5e | 938 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 939 | { |
355a72d7 | 940 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 941 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
942 | int error = 0; |
943 | ||
699c1985 SO |
944 | if (pcibios_pm_ops.thaw) { |
945 | error = pcibios_pm_ops.thaw(dev); | |
946 | if (error) | |
947 | return error; | |
948 | } | |
949 | ||
ad8cfa1d | 950 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 951 | return pci_legacy_resume(dev); |
bb808945 | 952 | |
5294e256 RW |
953 | if (pm) { |
954 | if (pm->thaw) | |
955 | error = pm->thaw(dev); | |
956 | } else { | |
957 | pci_pm_reenable_device(pci_dev); | |
958 | } | |
bbb44d9f | 959 | |
4b77b0a2 RW |
960 | pci_dev->state_saved = false; |
961 | ||
bbb44d9f RW |
962 | return error; |
963 | } | |
964 | ||
965 | static int pci_pm_poweroff(struct device *dev) | |
966 | { | |
355a72d7 | 967 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 968 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 969 | |
ad8cfa1d RW |
970 | if (pci_has_legacy_pm_support(pci_dev)) |
971 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 972 | |
5294e256 RW |
973 | if (!pm) { |
974 | pci_pm_default_suspend(pci_dev); | |
975 | goto Fixup; | |
976 | } | |
977 | ||
7cd0602d RW |
978 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
979 | pm_runtime_resume(dev); | |
980 | ||
82fee4d6 | 981 | pci_dev->state_saved = false; |
5294e256 | 982 | if (pm->poweroff) { |
46939f8b RW |
983 | int error; |
984 | ||
ddb7c9d2 RW |
985 | error = pm->poweroff(dev); |
986 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
987 | if (error) |
988 | return error; | |
bbb44d9f RW |
989 | } |
990 | ||
5294e256 RW |
991 | Fixup: |
992 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 993 | |
699c1985 SO |
994 | if (pcibios_pm_ops.poweroff) |
995 | return pcibios_pm_ops.poweroff(dev); | |
996 | ||
46939f8b | 997 | return 0; |
bbb44d9f RW |
998 | } |
999 | ||
1000 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1001 | { | |
46939f8b | 1002 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1003 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1004 | |
bb808945 RW |
1005 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1006 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1007 | ||
7d2a01b8 AN |
1008 | if (!drv || !drv->pm) { |
1009 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1010 | return 0; |
7d2a01b8 | 1011 | } |
46939f8b RW |
1012 | |
1013 | if (drv->pm->poweroff_noirq) { | |
1014 | int error; | |
1015 | ||
d67e37d7 RW |
1016 | error = drv->pm->poweroff_noirq(dev); |
1017 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1018 | if (error) |
1019 | return error; | |
bbb44d9f RW |
1020 | } |
1021 | ||
326c1cda | 1022 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1023 | pci_prepare_to_sleep(pci_dev); |
1024 | ||
0b68c8e2 RW |
1025 | /* |
1026 | * The reason for doing this here is the same as for the analogous code | |
1027 | * in pci_pm_suspend_noirq(). | |
1028 | */ | |
1029 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1030 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1031 | ||
7d2a01b8 AN |
1032 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1033 | ||
699c1985 SO |
1034 | if (pcibios_pm_ops.poweroff_noirq) |
1035 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1036 | ||
46939f8b | 1037 | return 0; |
bbb44d9f RW |
1038 | } |
1039 | ||
f6dc1e5e | 1040 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1041 | { |
1042 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1043 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1044 | int error = 0; |
bbb44d9f | 1045 | |
699c1985 SO |
1046 | if (pcibios_pm_ops.restore_noirq) { |
1047 | error = pcibios_pm_ops.restore_noirq(dev); | |
1048 | if (error) | |
1049 | return error; | |
1050 | } | |
1051 | ||
6cbf8214 | 1052 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1053 | |
ad8cfa1d | 1054 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1055 | return pci_legacy_resume_early(dev); |
bb808945 | 1056 | |
f6dc1e5e RW |
1057 | if (drv && drv->pm && drv->pm->restore_noirq) |
1058 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1059 | |
1060 | return error; | |
1061 | } | |
1062 | ||
f6dc1e5e | 1063 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1064 | { |
1065 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1066 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1067 | int error = 0; |
1068 | ||
699c1985 SO |
1069 | if (pcibios_pm_ops.restore) { |
1070 | error = pcibios_pm_ops.restore(dev); | |
1071 | if (error) | |
1072 | return error; | |
1073 | } | |
1074 | ||
418e4da3 RW |
1075 | /* |
1076 | * This is necessary for the hibernation error path in which restore is | |
1077 | * called without restoring the standard config registers of the device. | |
1078 | */ | |
1079 | if (pci_dev->state_saved) | |
1080 | pci_restore_standard_config(pci_dev); | |
1081 | ||
ad8cfa1d | 1082 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1083 | return pci_legacy_resume(dev); |
bb808945 | 1084 | |
5294e256 | 1085 | pci_pm_default_resume(pci_dev); |
73410429 | 1086 | |
5294e256 RW |
1087 | if (pm) { |
1088 | if (pm->restore) | |
1089 | error = pm->restore(dev); | |
1090 | } else { | |
1091 | pci_pm_reenable_device(pci_dev); | |
1092 | } | |
bbb44d9f RW |
1093 | |
1094 | return error; | |
c8958177 | 1095 | } |
1da177e4 | 1096 | |
1f112cee | 1097 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1098 | |
1099 | #define pci_pm_freeze NULL | |
1100 | #define pci_pm_freeze_noirq NULL | |
1101 | #define pci_pm_thaw NULL | |
1102 | #define pci_pm_thaw_noirq NULL | |
1103 | #define pci_pm_poweroff NULL | |
1104 | #define pci_pm_poweroff_noirq NULL | |
1105 | #define pci_pm_restore NULL | |
1106 | #define pci_pm_restore_noirq NULL | |
1107 | ||
1f112cee | 1108 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1109 | |
6cbf8214 RW |
1110 | #ifdef CONFIG_PM_RUNTIME |
1111 | ||
1112 | static int pci_pm_runtime_suspend(struct device *dev) | |
1113 | { | |
1114 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1115 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1116 | pci_power_t prev = pci_dev->current_state; | |
1117 | int error; | |
1118 | ||
967577b0 HY |
1119 | /* |
1120 | * If pci_dev->driver is not set (unbound), the device should | |
1121 | * always remain in D0 regardless of the runtime PM status | |
1122 | */ | |
1123 | if (!pci_dev->driver) | |
1124 | return 0; | |
1125 | ||
6cbf8214 RW |
1126 | if (!pm || !pm->runtime_suspend) |
1127 | return -ENOSYS; | |
1128 | ||
82fee4d6 | 1129 | pci_dev->state_saved = false; |
448bd857 | 1130 | pci_dev->no_d3cold = false; |
6cbf8214 RW |
1131 | error = pm->runtime_suspend(dev); |
1132 | suspend_report_result(pm->runtime_suspend, error); | |
1133 | if (error) | |
1134 | return error; | |
448bd857 HY |
1135 | if (!pci_dev->d3cold_allowed) |
1136 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1137 | |
1138 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1139 | ||
1140 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1141 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1142 | WARN_ONCE(pci_dev->current_state != prev, | |
1143 | "PCI PM: State of device not saved by %pF\n", | |
1144 | pm->runtime_suspend); | |
1145 | return 0; | |
1146 | } | |
1147 | ||
42eca230 | 1148 | if (!pci_dev->state_saved) { |
6cbf8214 | 1149 | pci_save_state(pci_dev); |
42eca230 DA |
1150 | pci_finish_runtime_suspend(pci_dev); |
1151 | } | |
6cbf8214 RW |
1152 | |
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static int pci_pm_runtime_resume(struct device *dev) | |
1157 | { | |
448bd857 | 1158 | int rc; |
6cbf8214 RW |
1159 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1160 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1161 | ||
967577b0 HY |
1162 | /* |
1163 | * If pci_dev->driver is not set (unbound), the device should | |
1164 | * always remain in D0 regardless of the runtime PM status | |
1165 | */ | |
1166 | if (!pci_dev->driver) | |
1167 | return 0; | |
1168 | ||
6cbf8214 RW |
1169 | if (!pm || !pm->runtime_resume) |
1170 | return -ENOSYS; | |
1171 | ||
db288c9c RW |
1172 | pci_restore_standard_config(pci_dev); |
1173 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1174 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1175 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1176 | ||
448bd857 HY |
1177 | rc = pm->runtime_resume(dev); |
1178 | ||
1179 | pci_dev->runtime_d3cold = false; | |
1180 | ||
1181 | return rc; | |
6cbf8214 RW |
1182 | } |
1183 | ||
1184 | static int pci_pm_runtime_idle(struct device *dev) | |
1185 | { | |
967577b0 | 1186 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1187 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1188 | int ret = 0; |
6cbf8214 | 1189 | |
967577b0 HY |
1190 | /* |
1191 | * If pci_dev->driver is not set (unbound), the device should | |
1192 | * always remain in D0 regardless of the runtime PM status | |
1193 | */ | |
1194 | if (!pci_dev->driver) | |
45f0a85c | 1195 | return 0; |
967577b0 | 1196 | |
6cbf8214 RW |
1197 | if (!pm) |
1198 | return -ENOSYS; | |
1199 | ||
45f0a85c RW |
1200 | if (pm->runtime_idle) |
1201 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1202 | |
45f0a85c | 1203 | return ret; |
6cbf8214 RW |
1204 | } |
1205 | ||
1206 | #else /* !CONFIG_PM_RUNTIME */ | |
1207 | ||
1208 | #define pci_pm_runtime_suspend NULL | |
1209 | #define pci_pm_runtime_resume NULL | |
1210 | #define pci_pm_runtime_idle NULL | |
1211 | ||
1212 | #endif /* !CONFIG_PM_RUNTIME */ | |
1213 | ||
aa338601 | 1214 | #ifdef CONFIG_PM |
6cbf8214 | 1215 | |
f91da04d | 1216 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1217 | .prepare = pci_pm_prepare, |
adf09493 RW |
1218 | .suspend = pci_pm_suspend, |
1219 | .resume = pci_pm_resume, | |
1220 | .freeze = pci_pm_freeze, | |
1221 | .thaw = pci_pm_thaw, | |
1222 | .poweroff = pci_pm_poweroff, | |
1223 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1224 | .suspend_noirq = pci_pm_suspend_noirq, |
1225 | .resume_noirq = pci_pm_resume_noirq, | |
1226 | .freeze_noirq = pci_pm_freeze_noirq, | |
1227 | .thaw_noirq = pci_pm_thaw_noirq, | |
1228 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1229 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1230 | .runtime_suspend = pci_pm_runtime_suspend, |
1231 | .runtime_resume = pci_pm_runtime_resume, | |
1232 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1233 | }; |
1234 | ||
adf09493 | 1235 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1236 | |
6cbf8214 | 1237 | #else /* !COMFIG_PM_OPS */ |
bbb44d9f RW |
1238 | |
1239 | #define PCI_PM_OPS_PTR NULL | |
1240 | ||
6cbf8214 | 1241 | #endif /* !COMFIG_PM_OPS */ |
bbb44d9f | 1242 | |
1da177e4 | 1243 | /** |
863b18f4 | 1244 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1245 | * @drv: the driver structure to register |
863b18f4 | 1246 | * @owner: owner module of drv |
f95d882d | 1247 | * @mod_name: module name string |
f7625980 | 1248 | * |
1da177e4 | 1249 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1250 | * Returns a negative value on error, otherwise 0. |
1251 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1252 | * no device was claimed during registration. |
1253 | */ | |
725522b5 GKH |
1254 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1255 | const char *mod_name) | |
1da177e4 | 1256 | { |
1da177e4 LT |
1257 | /* initialize common driver fields */ |
1258 | drv->driver.name = drv->name; | |
1259 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1260 | drv->driver.owner = owner; |
725522b5 | 1261 | drv->driver.mod_name = mod_name; |
50b00755 | 1262 | |
75865858 GKH |
1263 | spin_lock_init(&drv->dynids.lock); |
1264 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1265 | |
1266 | /* register with core */ | |
bfb09a86 | 1267 | return driver_register(&drv->driver); |
1da177e4 | 1268 | } |
b7fe9434 | 1269 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1270 | |
1271 | /** | |
1272 | * pci_unregister_driver - unregister a pci driver | |
1273 | * @drv: the driver structure to unregister | |
f7625980 | 1274 | * |
1da177e4 LT |
1275 | * Deletes the driver structure from the list of registered PCI drivers, |
1276 | * gives it a chance to clean up by calling its remove() function for | |
1277 | * each device it was responsible for, and marks those devices as | |
1278 | * driverless. | |
1279 | */ | |
1280 | ||
3c78bc61 | 1281 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1282 | { |
1283 | driver_unregister(&drv->driver); | |
1284 | pci_free_dynids(drv); | |
1285 | } | |
b7fe9434 | 1286 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1287 | |
1288 | static struct pci_driver pci_compat_driver = { | |
1289 | .name = "compat" | |
1290 | }; | |
1291 | ||
1292 | /** | |
1293 | * pci_dev_driver - get the pci_driver of a device | |
1294 | * @dev: the device to query | |
1295 | * | |
f7625980 | 1296 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1297 | * registered driver for the device. |
1298 | */ | |
3c78bc61 | 1299 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1300 | { |
1301 | if (dev->driver) | |
1302 | return dev->driver; | |
1303 | else { | |
1304 | int i; | |
3c78bc61 | 1305 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1306 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1307 | return &pci_compat_driver; | |
1308 | } | |
1309 | return NULL; | |
1310 | } | |
b7fe9434 | 1311 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1312 | |
1313 | /** | |
1314 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1315 | * @dev: the PCI device structure to match against |
8f7020d3 | 1316 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1317 | * |
1da177e4 | 1318 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1319 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1320 | * pci_device_id structure or %NULL if there is no match. |
1321 | */ | |
75865858 | 1322 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1323 | { |
75865858 | 1324 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1325 | struct pci_driver *pci_drv; |
1da177e4 LT |
1326 | const struct pci_device_id *found_id; |
1327 | ||
58d9a38f YL |
1328 | if (!pci_dev->match_driver) |
1329 | return 0; | |
1330 | ||
1331 | pci_drv = to_pci_driver(drv); | |
75865858 | 1332 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1333 | if (found_id) |
1334 | return 1; | |
1335 | ||
75865858 | 1336 | return 0; |
1da177e4 LT |
1337 | } |
1338 | ||
1339 | /** | |
1340 | * pci_dev_get - increments the reference count of the pci device structure | |
1341 | * @dev: the device being referenced | |
1342 | * | |
1343 | * Each live reference to a device should be refcounted. | |
1344 | * | |
1345 | * Drivers for PCI devices should normally record such references in | |
1346 | * their probe() methods, when they bind to a device, and release | |
1347 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1348 | * | |
1349 | * A pointer to the device with the incremented reference counter is returned. | |
1350 | */ | |
1351 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1352 | { | |
1353 | if (dev) | |
1354 | get_device(&dev->dev); | |
1355 | return dev; | |
1356 | } | |
b7fe9434 | 1357 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1358 | |
1359 | /** | |
1360 | * pci_dev_put - release a use of the pci device structure | |
1361 | * @dev: device that's been disconnected | |
1362 | * | |
1363 | * Must be called when a user of a device is finished with it. When the last | |
1364 | * user of the device calls this function, the memory of the device is freed. | |
1365 | */ | |
1366 | void pci_dev_put(struct pci_dev *dev) | |
1367 | { | |
1368 | if (dev) | |
1369 | put_device(&dev->dev); | |
1370 | } | |
b7fe9434 | 1371 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1372 | |
8ccc9aa1 BP |
1373 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1374 | { | |
1375 | struct pci_dev *pdev; | |
1376 | ||
1377 | if (!dev) | |
1378 | return -ENODEV; | |
1379 | ||
1380 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1381 | |
1382 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1383 | return -ENOMEM; | |
1384 | ||
1385 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1386 | return -ENOMEM; | |
1387 | ||
1388 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1389 | pdev->subsystem_device)) | |
1390 | return -ENOMEM; | |
1391 | ||
1392 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1393 | return -ENOMEM; | |
1394 | ||
1395 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x", | |
1396 | pdev->vendor, pdev->device, | |
1397 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1398 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1399 | (u8)(pdev->class))) | |
1400 | return -ENOMEM; | |
efdd4070 | 1401 | |
8ccc9aa1 BP |
1402 | return 0; |
1403 | } | |
1404 | ||
1da177e4 LT |
1405 | struct bus_type pci_bus_type = { |
1406 | .name = "pci", | |
1407 | .match = pci_bus_match, | |
312c004d | 1408 | .uevent = pci_uevent, |
b15d686a RK |
1409 | .probe = pci_device_probe, |
1410 | .remove = pci_device_remove, | |
cbd69dbb | 1411 | .shutdown = pci_device_shutdown, |
5136b2da | 1412 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1413 | .bus_groups = pci_bus_groups, |
2229c1fb | 1414 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1415 | .pm = PCI_PM_OPS_PTR, |
1da177e4 | 1416 | }; |
b7fe9434 | 1417 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1418 | |
1419 | static int __init pci_driver_init(void) | |
1420 | { | |
1421 | return bus_register(&pci_bus_type); | |
1422 | } | |
1da177e4 | 1423 | postcore_initcall(pci_driver_init); |