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; | |
9dba910e TH |
58 | |
59 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
60 | if (!dynid) | |
61 | return -ENOMEM; | |
62 | ||
63 | dynid->id.vendor = vendor; | |
64 | dynid->id.device = device; | |
65 | dynid->id.subvendor = subvendor; | |
66 | dynid->id.subdevice = subdevice; | |
67 | dynid->id.class = class; | |
68 | dynid->id.class_mask = class_mask; | |
69 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 70 | |
9dba910e TH |
71 | spin_lock(&drv->dynids.lock); |
72 | list_add_tail(&dynid->node, &drv->dynids.list); | |
73 | spin_unlock(&drv->dynids.lock); | |
74 | ||
3b7f1016 | 75 | return driver_attach(&drv->driver); |
9dba910e | 76 | } |
b7fe9434 | 77 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
9dba910e TH |
78 | |
79 | static void pci_free_dynids(struct pci_driver *drv) | |
80 | { | |
81 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 82 | |
9dba910e TH |
83 | spin_lock(&drv->dynids.lock); |
84 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
85 | list_del(&dynid->node); | |
86 | kfree(dynid); | |
87 | } | |
88 | spin_unlock(&drv->dynids.lock); | |
89 | } | |
90 | ||
1da177e4 | 91 | /** |
9dba910e | 92 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
93 | * @driver: target device driver |
94 | * @buf: buffer for scanning device ID data | |
95 | * @count: input size | |
1da177e4 | 96 | * |
9dba910e | 97 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 98 | */ |
3c78bc61 RD |
99 | static ssize_t store_new_id(struct device_driver *driver, const char *buf, |
100 | size_t count) | |
1da177e4 | 101 | { |
1da177e4 | 102 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 103 | const struct pci_device_id *ids = pdrv->id_table; |
3c78bc61 RD |
104 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
105 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
106 | unsigned long driver_data = 0; | |
107 | int fields = 0; | |
8895d3bc | 108 | int retval = 0; |
1da177e4 | 109 | |
b41d6cf3 | 110 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
111 | &vendor, &device, &subvendor, &subdevice, |
112 | &class, &class_mask, &driver_data); | |
6ba18636 | 113 | if (fields < 2) |
1da177e4 LT |
114 | return -EINVAL; |
115 | ||
8895d3bc BD |
116 | if (fields != 7) { |
117 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
118 | if (!pdev) | |
119 | return -ENOMEM; | |
120 | ||
121 | pdev->vendor = vendor; | |
122 | pdev->device = device; | |
123 | pdev->subsystem_vendor = subvendor; | |
124 | pdev->subsystem_device = subdevice; | |
125 | pdev->class = class; | |
126 | ||
127 | if (pci_match_id(pdrv->id_table, pdev)) | |
128 | retval = -EEXIST; | |
129 | ||
130 | kfree(pdev); | |
131 | ||
132 | if (retval) | |
133 | return retval; | |
134 | } | |
135 | ||
b41d6cf3 JD |
136 | /* Only accept driver_data values that match an existing id_table |
137 | entry */ | |
2debb4d2 CW |
138 | if (ids) { |
139 | retval = -EINVAL; | |
140 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
141 | if (driver_data == ids->driver_data) { | |
142 | retval = 0; | |
143 | break; | |
144 | } | |
145 | ids++; | |
b41d6cf3 | 146 | } |
2debb4d2 CW |
147 | if (retval) /* No match */ |
148 | return retval; | |
b41d6cf3 | 149 | } |
b41d6cf3 | 150 | |
9dba910e TH |
151 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
152 | class, class_mask, driver_data); | |
b19441af GKH |
153 | if (retval) |
154 | return retval; | |
1da177e4 LT |
155 | return count; |
156 | } | |
2229c1fb | 157 | static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id); |
1da177e4 | 158 | |
0994375e CW |
159 | /** |
160 | * store_remove_id - remove a PCI device ID from this driver | |
161 | * @driver: target device driver | |
162 | * @buf: buffer for scanning device ID data | |
163 | * @count: input size | |
164 | * | |
165 | * Removes a dynamic pci device ID to this driver. | |
166 | */ | |
3c78bc61 RD |
167 | static ssize_t store_remove_id(struct device_driver *driver, const char *buf, |
168 | size_t count) | |
0994375e CW |
169 | { |
170 | struct pci_dynid *dynid, *n; | |
171 | struct pci_driver *pdrv = to_pci_driver(driver); | |
172 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
173 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
174 | int fields = 0; | |
175 | int retval = -ENODEV; | |
176 | ||
177 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
178 | &vendor, &device, &subvendor, &subdevice, | |
179 | &class, &class_mask); | |
180 | if (fields < 2) | |
181 | return -EINVAL; | |
182 | ||
183 | spin_lock(&pdrv->dynids.lock); | |
184 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
185 | struct pci_device_id *id = &dynid->id; | |
186 | if ((id->vendor == vendor) && | |
187 | (id->device == device) && | |
188 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
189 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
190 | !((id->class ^ class) & class_mask)) { | |
191 | list_del(&dynid->node); | |
192 | kfree(dynid); | |
193 | retval = 0; | |
194 | break; | |
195 | } | |
196 | } | |
197 | spin_unlock(&pdrv->dynids.lock); | |
198 | ||
199 | if (retval) | |
200 | return retval; | |
201 | return count; | |
202 | } | |
2229c1fb | 203 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
0994375e | 204 | |
2229c1fb GKH |
205 | static struct attribute *pci_drv_attrs[] = { |
206 | &driver_attr_new_id.attr, | |
207 | &driver_attr_remove_id.attr, | |
208 | NULL, | |
bfb09a86 | 209 | }; |
2229c1fb | 210 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 211 | |
1da177e4 | 212 | /** |
75865858 | 213 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 214 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
215 | * @dev: the PCI device structure to match against. |
216 | * | |
1da177e4 | 217 | * Used by a driver to check whether a PCI device present in the |
75865858 | 218 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 219 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 220 | * |
8b60756a | 221 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 222 | * that a driver might want to check for. |
1da177e4 | 223 | */ |
75865858 GKH |
224 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
225 | struct pci_dev *dev) | |
1da177e4 | 226 | { |
75865858 GKH |
227 | if (ids) { |
228 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
229 | if (pci_match_one_device(ids, dev)) | |
230 | return ids; | |
231 | ids++; | |
232 | } | |
1da177e4 LT |
233 | } |
234 | return NULL; | |
235 | } | |
b7fe9434 | 236 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 237 | |
782a985d AW |
238 | static const struct pci_device_id pci_device_id_any = { |
239 | .vendor = PCI_ANY_ID, | |
240 | .device = PCI_ANY_ID, | |
241 | .subvendor = PCI_ANY_ID, | |
242 | .subdevice = PCI_ANY_ID, | |
243 | }; | |
244 | ||
1da177e4 | 245 | /** |
ae9608af | 246 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 247 | * @drv: the PCI driver to match against |
39ba487f | 248 | * @dev: the PCI device structure to match against |
75865858 GKH |
249 | * |
250 | * Used by a driver to check whether a PCI device present in the | |
251 | * system is in its list of supported devices. Returns the matching | |
252 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 253 | */ |
d73460d7 AB |
254 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
255 | struct pci_dev *dev) | |
75865858 | 256 | { |
75865858 | 257 | struct pci_dynid *dynid; |
782a985d AW |
258 | const struct pci_device_id *found_id = NULL; |
259 | ||
260 | /* When driver_override is set, only bind to the matching driver */ | |
261 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
262 | return NULL; | |
1da177e4 | 263 | |
7461b60a | 264 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
265 | spin_lock(&drv->dynids.lock); |
266 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
267 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
268 | found_id = &dynid->id; |
269 | break; | |
75865858 | 270 | } |
1da177e4 | 271 | } |
75865858 | 272 | spin_unlock(&drv->dynids.lock); |
7461b60a | 273 | |
782a985d AW |
274 | if (!found_id) |
275 | found_id = pci_match_id(drv->id_table, dev); | |
276 | ||
277 | /* driver_override will always match, send a dummy id */ | |
278 | if (!found_id && dev->driver_override) | |
279 | found_id = &pci_device_id_any; | |
280 | ||
281 | return found_id; | |
1da177e4 LT |
282 | } |
283 | ||
873392ca RR |
284 | struct drv_dev_and_id { |
285 | struct pci_driver *drv; | |
286 | struct pci_dev *dev; | |
287 | const struct pci_device_id *id; | |
288 | }; | |
289 | ||
290 | static long local_pci_probe(void *_ddi) | |
291 | { | |
292 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
293 | struct pci_dev *pci_dev = ddi->dev; |
294 | struct pci_driver *pci_drv = ddi->drv; | |
295 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
296 | int rc; |
297 | ||
967577b0 HY |
298 | /* |
299 | * Unbound PCI devices are always put in D0, regardless of | |
300 | * runtime PM status. During probe, the device is set to | |
301 | * active and the usage count is incremented. If the driver | |
302 | * supports runtime PM, it should call pm_runtime_put_noidle() | |
303 | * in its probe routine and pm_runtime_get_noresume() in its | |
304 | * remove routine. | |
f3ec4f87 | 305 | */ |
967577b0 HY |
306 | pm_runtime_get_sync(dev); |
307 | pci_dev->driver = pci_drv; | |
308 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
309 | if (!rc) |
310 | return rc; | |
311 | if (rc < 0) { | |
967577b0 HY |
312 | pci_dev->driver = NULL; |
313 | pm_runtime_put_sync(dev); | |
f92d74c1 | 314 | return rc; |
f3ec4f87 | 315 | } |
f92d74c1 SC |
316 | /* |
317 | * Probe function should return < 0 for failure, 0 for success | |
318 | * Treat values > 0 as success, but warn. | |
319 | */ | |
320 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
321 | return 0; | |
873392ca RR |
322 | } |
323 | ||
d42c6997 AK |
324 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
325 | const struct pci_device_id *id) | |
326 | { | |
873392ca RR |
327 | int error, node; |
328 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
329 | ||
12c3156f AD |
330 | /* |
331 | * Execute driver initialization on node where the device is | |
332 | * attached. This way the driver likely allocates its local memory | |
333 | * on the right node. | |
334 | */ | |
873392ca | 335 | node = dev_to_node(&dev->dev); |
12c3156f AD |
336 | |
337 | /* | |
338 | * On NUMA systems, we are likely to call a PF probe function using | |
339 | * work_on_cpu(). If that probe calls pci_enable_sriov() (which | |
340 | * adds the VF devices via pci_bus_add_device()), we may re-enter | |
341 | * this function to call the VF probe function. Calling | |
342 | * work_on_cpu() again will cause a lockdep warning. Since VFs are | |
343 | * always on the same node as the PF, we can work around this by | |
344 | * avoiding work_on_cpu() when we're already on the correct node. | |
345 | * | |
346 | * Preemption is enabled, so it's theoretically unsafe to use | |
347 | * numa_node_id(), but even if we run the probe function on the | |
348 | * wrong node, it should be functionally correct. | |
349 | */ | |
350 | if (node >= 0 && node != numa_node_id()) { | |
873392ca | 351 | int cpu; |
873392ca RR |
352 | |
353 | get_online_cpus(); | |
a70f7302 | 354 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
355 | if (cpu < nr_cpu_ids) |
356 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
357 | else | |
358 | error = local_pci_probe(&ddi); | |
359 | put_online_cpus(); | |
360 | } else | |
361 | error = local_pci_probe(&ddi); | |
12c3156f | 362 | |
d42c6997 AK |
363 | return error; |
364 | } | |
365 | ||
1da177e4 | 366 | /** |
23ea3793 | 367 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
368 | * @drv: driver to call to check if it wants the PCI device |
369 | * @pci_dev: PCI device being probed | |
f7625980 | 370 | * |
8f7020d3 | 371 | * returns 0 on success, else error. |
1da177e4 LT |
372 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
373 | */ | |
3c78bc61 | 374 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
375 | { |
376 | const struct pci_device_id *id; | |
1da177e4 LT |
377 | int error = 0; |
378 | ||
379 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
380 | error = -ENODEV; |
381 | ||
382 | id = pci_match_device(drv, pci_dev); | |
383 | if (id) | |
d42c6997 | 384 | error = pci_call_probe(drv, pci_dev, id); |
967577b0 | 385 | if (error >= 0) |
75865858 | 386 | error = 0; |
1da177e4 LT |
387 | } |
388 | return error; | |
389 | } | |
390 | ||
3c78bc61 | 391 | static int pci_device_probe(struct device *dev) |
1da177e4 LT |
392 | { |
393 | int error = 0; | |
394 | struct pci_driver *drv; | |
395 | struct pci_dev *pci_dev; | |
396 | ||
397 | drv = to_pci_driver(dev->driver); | |
398 | pci_dev = to_pci_dev(dev); | |
399 | pci_dev_get(pci_dev); | |
400 | error = __pci_device_probe(drv, pci_dev); | |
401 | if (error) | |
402 | pci_dev_put(pci_dev); | |
403 | ||
404 | return error; | |
405 | } | |
406 | ||
3c78bc61 | 407 | static int pci_device_remove(struct device *dev) |
1da177e4 | 408 | { |
3c78bc61 RD |
409 | struct pci_dev *pci_dev = to_pci_dev(dev); |
410 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
411 | |
412 | if (drv) { | |
f3ec4f87 AS |
413 | if (drv->remove) { |
414 | pm_runtime_get_sync(dev); | |
1da177e4 | 415 | drv->remove(pci_dev); |
f3ec4f87 AS |
416 | pm_runtime_put_noidle(dev); |
417 | } | |
1da177e4 LT |
418 | pci_dev->driver = NULL; |
419 | } | |
420 | ||
f3ec4f87 | 421 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 422 | pm_runtime_put_sync(dev); |
f3ec4f87 | 423 | |
2449e06a SL |
424 | /* |
425 | * If the device is still on, set the power state as "unknown", | |
426 | * since it might change by the next time we load the driver. | |
427 | */ | |
428 | if (pci_dev->current_state == PCI_D0) | |
429 | pci_dev->current_state = PCI_UNKNOWN; | |
430 | ||
1da177e4 LT |
431 | /* |
432 | * We would love to complain here if pci_dev->is_enabled is set, that | |
433 | * the driver should have called pci_disable_device(), but the | |
434 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 435 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
436 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
437 | * horrible the crap we have to deal with is when we are awake... | |
438 | */ | |
439 | ||
440 | pci_dev_put(pci_dev); | |
441 | return 0; | |
442 | } | |
443 | ||
bbb44d9f RW |
444 | static void pci_device_shutdown(struct device *dev) |
445 | { | |
446 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
447 | struct pci_driver *drv = pci_dev->driver; | |
448 | ||
3ff2de9b HY |
449 | pm_runtime_resume(dev); |
450 | ||
bbb44d9f RW |
451 | if (drv && drv->shutdown) |
452 | drv->shutdown(pci_dev); | |
453 | pci_msi_shutdown(pci_dev); | |
454 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 455 | |
4fc9bbf9 | 456 | #ifdef CONFIG_KEXEC |
b566a22c | 457 | /* |
4fc9bbf9 KA |
458 | * If this is a kexec reboot, turn off Bus Master bit on the |
459 | * device to tell it to not continue to do DMA. Don't touch | |
460 | * devices in D3cold or unknown states. | |
461 | * If it is not a kexec reboot, firmware will hit the PCI | |
462 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 463 | */ |
4fc9bbf9 | 464 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 465 | pci_clear_master(pci_dev); |
4fc9bbf9 | 466 | #endif |
bbb44d9f RW |
467 | } |
468 | ||
aa338601 | 469 | #ifdef CONFIG_PM |
6cbf8214 RW |
470 | |
471 | /* Auxiliary functions used for system resume and run-time resume. */ | |
472 | ||
473 | /** | |
474 | * pci_restore_standard_config - restore standard config registers of PCI device | |
475 | * @pci_dev: PCI device to handle | |
476 | */ | |
477 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
478 | { | |
479 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
480 | ||
481 | if (pci_dev->current_state != PCI_D0) { | |
482 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
483 | if (error) | |
484 | return error; | |
485 | } | |
486 | ||
1d3c16a8 JM |
487 | pci_restore_state(pci_dev); |
488 | return 0; | |
6cbf8214 RW |
489 | } |
490 | ||
db288c9c RW |
491 | #endif |
492 | ||
493 | #ifdef CONFIG_PM_SLEEP | |
494 | ||
6cbf8214 RW |
495 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
496 | { | |
db288c9c RW |
497 | pci_power_up(pci_dev); |
498 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
499 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
500 | } | |
501 | ||
fa58d305 RW |
502 | /* |
503 | * Default "suspend" method for devices that have no driver provided suspend, | |
504 | * or not even a driver at all (second part). | |
bbb44d9f | 505 | */ |
bb808945 | 506 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 507 | { |
bbb44d9f RW |
508 | /* |
509 | * mark its power state as "unknown", since we don't know if | |
510 | * e.g. the BIOS will change its device state when we suspend. | |
511 | */ | |
512 | if (pci_dev->current_state == PCI_D0) | |
513 | pci_dev->current_state = PCI_UNKNOWN; | |
514 | } | |
515 | ||
355a72d7 RW |
516 | /* |
517 | * Default "resume" method for devices that have no driver provided resume, | |
518 | * or not even a driver at all (second part). | |
519 | */ | |
bb808945 | 520 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
521 | { |
522 | int retval; | |
523 | ||
bbb44d9f RW |
524 | /* if the device was enabled before suspend, reenable */ |
525 | retval = pci_reenable_device(pci_dev); | |
526 | /* | |
527 | * if the device was busmaster before the suspend, make it busmaster | |
528 | * again | |
529 | */ | |
530 | if (pci_dev->is_busmaster) | |
531 | pci_set_master(pci_dev); | |
532 | ||
533 | return retval; | |
534 | } | |
535 | ||
536 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 537 | { |
3c78bc61 RD |
538 | struct pci_dev *pci_dev = to_pci_dev(dev); |
539 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 540 | |
02669492 | 541 | if (drv && drv->suspend) { |
99dadce8 | 542 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 543 | int error; |
aa8c6c93 | 544 | |
57ef8026 FP |
545 | error = drv->suspend(pci_dev, state); |
546 | suspend_report_result(drv->suspend, error); | |
547 | if (error) | |
548 | return error; | |
aa8c6c93 | 549 | |
46939f8b | 550 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
551 | && pci_dev->current_state != PCI_UNKNOWN) { |
552 | WARN_ONCE(pci_dev->current_state != prev, | |
553 | "PCI PM: Device state not saved by %pF\n", | |
554 | drv->suspend); | |
99dadce8 | 555 | } |
02669492 | 556 | } |
ad8cfa1d RW |
557 | |
558 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
559 | ||
46939f8b | 560 | return 0; |
1da177e4 LT |
561 | } |
562 | ||
bbb44d9f | 563 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 564 | { |
3c78bc61 RD |
565 | struct pci_dev *pci_dev = to_pci_dev(dev); |
566 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
567 | |
568 | if (drv && drv->suspend_late) { | |
46939f8b RW |
569 | pci_power_t prev = pci_dev->current_state; |
570 | int error; | |
571 | ||
57ef8026 FP |
572 | error = drv->suspend_late(pci_dev, state); |
573 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
574 | if (error) |
575 | return error; | |
576 | ||
577 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
578 | && pci_dev->current_state != PCI_UNKNOWN) { | |
579 | WARN_ONCE(pci_dev->current_state != prev, | |
580 | "PCI PM: Device state not saved by %pF\n", | |
581 | drv->suspend_late); | |
7d2a01b8 | 582 | goto Fixup; |
46939f8b | 583 | } |
cbd69dbb | 584 | } |
46939f8b RW |
585 | |
586 | if (!pci_dev->state_saved) | |
587 | pci_save_state(pci_dev); | |
588 | ||
589 | pci_pm_set_unknown_state(pci_dev); | |
590 | ||
7d2a01b8 AN |
591 | Fixup: |
592 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
593 | ||
46939f8b | 594 | return 0; |
cbd69dbb | 595 | } |
1da177e4 | 596 | |
f6dc1e5e RW |
597 | static int pci_legacy_resume_early(struct device *dev) |
598 | { | |
3c78bc61 RD |
599 | struct pci_dev *pci_dev = to_pci_dev(dev); |
600 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 601 | |
aa8c6c93 RW |
602 | return drv && drv->resume_early ? |
603 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
604 | } |
605 | ||
bbb44d9f | 606 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 607 | { |
3c78bc61 RD |
608 | struct pci_dev *pci_dev = to_pci_dev(dev); |
609 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 610 | |
ad8cfa1d RW |
611 | pci_fixup_device(pci_fixup_resume, pci_dev); |
612 | ||
aa8c6c93 RW |
613 | return drv && drv->resume ? |
614 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
615 | } |
616 | ||
571ff758 RW |
617 | /* Auxiliary functions used by the new power management framework */ |
618 | ||
5294e256 | 619 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 620 | { |
73410429 RW |
621 | pci_fixup_device(pci_fixup_resume, pci_dev); |
622 | ||
326c1cda | 623 | if (!pci_has_subordinate(pci_dev)) |
5294e256 | 624 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
625 | } |
626 | ||
5294e256 | 627 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 628 | { |
5294e256 | 629 | /* Disable non-bridge devices without PM support */ |
326c1cda | 630 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 631 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
632 | } |
633 | ||
07e836e8 RW |
634 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
635 | { | |
636 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 637 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 638 | || drv->resume_early); |
bb808945 RW |
639 | |
640 | /* | |
641 | * Legacy PM support is used by default, so warn if the new framework is | |
642 | * supported as well. Drivers are supposed to support either the | |
643 | * former, or the latter, but not both at the same time. | |
644 | */ | |
82440a82 DF |
645 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
646 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
647 | |
648 | return ret; | |
07e836e8 RW |
649 | } |
650 | ||
571ff758 RW |
651 | /* New power management framework */ |
652 | ||
bbb44d9f RW |
653 | static int pci_pm_prepare(struct device *dev) |
654 | { | |
655 | struct device_driver *drv = dev->driver; | |
656 | int error = 0; | |
657 | ||
6cbf8214 | 658 | /* |
7cd0602d RW |
659 | * Devices having power.ignore_children set may still be necessary for |
660 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 661 | */ |
7cd0602d RW |
662 | if (dev->power.ignore_children) |
663 | pm_runtime_resume(dev); | |
6cbf8214 | 664 | |
bbb44d9f RW |
665 | if (drv && drv->pm && drv->pm->prepare) |
666 | error = drv->pm->prepare(dev); | |
667 | ||
668 | return error; | |
669 | } | |
670 | ||
bbb44d9f | 671 | |
6cbf8214 RW |
672 | #else /* !CONFIG_PM_SLEEP */ |
673 | ||
674 | #define pci_pm_prepare NULL | |
6cbf8214 RW |
675 | |
676 | #endif /* !CONFIG_PM_SLEEP */ | |
677 | ||
bbb44d9f RW |
678 | #ifdef CONFIG_SUSPEND |
679 | ||
680 | static int pci_pm_suspend(struct device *dev) | |
681 | { | |
682 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 683 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 684 | |
ad8cfa1d RW |
685 | if (pci_has_legacy_pm_support(pci_dev)) |
686 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 687 | |
5294e256 RW |
688 | if (!pm) { |
689 | pci_pm_default_suspend(pci_dev); | |
690 | goto Fixup; | |
691 | } | |
692 | ||
7cd0602d RW |
693 | /* |
694 | * PCI devices suspended at run time need to be resumed at this point, | |
695 | * because in general it is necessary to reconfigure them for system | |
696 | * suspend. Namely, if the device is supposed to wake up the system | |
697 | * from the sleep state, we may need to reconfigure it for this purpose. | |
698 | * In turn, if the device is not supposed to wake up the system from the | |
699 | * sleep state, we'll have to prevent it from signaling wake-up. | |
700 | */ | |
701 | pm_runtime_resume(dev); | |
702 | ||
82fee4d6 | 703 | pci_dev->state_saved = false; |
5294e256 RW |
704 | if (pm->suspend) { |
705 | pci_power_t prev = pci_dev->current_state; | |
706 | int error; | |
707 | ||
ddb7c9d2 RW |
708 | error = pm->suspend(dev); |
709 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
710 | if (error) |
711 | return error; | |
712 | ||
46939f8b | 713 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
714 | && pci_dev->current_state != PCI_UNKNOWN) { |
715 | WARN_ONCE(pci_dev->current_state != prev, | |
716 | "PCI PM: State of device not saved by %pF\n", | |
717 | pm->suspend); | |
5294e256 | 718 | } |
bbb44d9f | 719 | } |
fa58d305 | 720 | |
5294e256 RW |
721 | Fixup: |
722 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
723 | ||
724 | return 0; | |
bbb44d9f RW |
725 | } |
726 | ||
727 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 728 | { |
355a72d7 | 729 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 730 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 731 | |
bb808945 RW |
732 | if (pci_has_legacy_pm_support(pci_dev)) |
733 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
734 | ||
931ff68a RW |
735 | if (!pm) { |
736 | pci_save_state(pci_dev); | |
7d2a01b8 | 737 | goto Fixup; |
931ff68a | 738 | } |
46939f8b RW |
739 | |
740 | if (pm->suspend_noirq) { | |
741 | pci_power_t prev = pci_dev->current_state; | |
742 | int error; | |
743 | ||
744 | error = pm->suspend_noirq(dev); | |
745 | suspend_report_result(pm->suspend_noirq, error); | |
746 | if (error) | |
747 | return error; | |
748 | ||
749 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
750 | && pci_dev->current_state != PCI_UNKNOWN) { | |
751 | WARN_ONCE(pci_dev->current_state != prev, | |
752 | "PCI PM: State of device not saved by %pF\n", | |
753 | pm->suspend_noirq); | |
7d2a01b8 | 754 | goto Fixup; |
46939f8b | 755 | } |
bbb44d9f RW |
756 | } |
757 | ||
46939f8b RW |
758 | if (!pci_dev->state_saved) { |
759 | pci_save_state(pci_dev); | |
326c1cda | 760 | if (!pci_has_subordinate(pci_dev)) |
46939f8b RW |
761 | pci_prepare_to_sleep(pci_dev); |
762 | } | |
d67e37d7 | 763 | |
46939f8b RW |
764 | pci_pm_set_unknown_state(pci_dev); |
765 | ||
dbf0e4c7 AS |
766 | /* |
767 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
768 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
769 | * hasn't been quiesced and tries to turn it off. If the controller | |
770 | * is already in D3, this can hang or cause memory corruption. | |
771 | * | |
772 | * Since the value of the COMMAND register doesn't matter once the | |
773 | * device has been suspended, we can safely set it to 0 here. | |
774 | */ | |
775 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
776 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
777 | ||
7d2a01b8 AN |
778 | Fixup: |
779 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
780 | ||
46939f8b | 781 | return 0; |
c8958177 | 782 | } |
1da177e4 | 783 | |
f6dc1e5e | 784 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
785 | { |
786 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
787 | struct device_driver *drv = dev->driver; | |
355a72d7 | 788 | int error = 0; |
bbb44d9f | 789 | |
6cbf8214 | 790 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 791 | |
ad8cfa1d | 792 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 793 | return pci_legacy_resume_early(dev); |
bb808945 | 794 | |
f6dc1e5e RW |
795 | if (drv && drv->pm && drv->pm->resume_noirq) |
796 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
797 | |
798 | return error; | |
799 | } | |
800 | ||
f6dc1e5e | 801 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 802 | { |
355a72d7 | 803 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 804 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
805 | int error = 0; |
806 | ||
418e4da3 RW |
807 | /* |
808 | * This is necessary for the suspend error path in which resume is | |
809 | * called without restoring the standard config registers of the device. | |
810 | */ | |
811 | if (pci_dev->state_saved) | |
812 | pci_restore_standard_config(pci_dev); | |
813 | ||
ad8cfa1d | 814 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 815 | return pci_legacy_resume(dev); |
bb808945 | 816 | |
5294e256 | 817 | pci_pm_default_resume(pci_dev); |
73410429 | 818 | |
5294e256 RW |
819 | if (pm) { |
820 | if (pm->resume) | |
821 | error = pm->resume(dev); | |
822 | } else { | |
823 | pci_pm_reenable_device(pci_dev); | |
824 | } | |
bbb44d9f | 825 | |
999cce4a | 826 | return error; |
bbb44d9f RW |
827 | } |
828 | ||
829 | #else /* !CONFIG_SUSPEND */ | |
830 | ||
831 | #define pci_pm_suspend NULL | |
832 | #define pci_pm_suspend_noirq NULL | |
833 | #define pci_pm_resume NULL | |
834 | #define pci_pm_resume_noirq NULL | |
835 | ||
836 | #endif /* !CONFIG_SUSPEND */ | |
837 | ||
1f112cee | 838 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 839 | |
699c1985 SO |
840 | |
841 | /* | |
842 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
843 | * a hibernate transition | |
844 | */ | |
845 | struct dev_pm_ops __weak pcibios_pm_ops; | |
846 | ||
bbb44d9f RW |
847 | static int pci_pm_freeze(struct device *dev) |
848 | { | |
849 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 850 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 851 | |
ad8cfa1d RW |
852 | if (pci_has_legacy_pm_support(pci_dev)) |
853 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 854 | |
5294e256 RW |
855 | if (!pm) { |
856 | pci_pm_default_suspend(pci_dev); | |
857 | return 0; | |
bbb44d9f RW |
858 | } |
859 | ||
7cd0602d RW |
860 | /* |
861 | * This used to be done in pci_pm_prepare() for all devices and some | |
862 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
863 | * devices should not be touched during freeze/thaw transitions, | |
864 | * however. | |
865 | */ | |
866 | pm_runtime_resume(dev); | |
867 | ||
82fee4d6 | 868 | pci_dev->state_saved = false; |
5294e256 RW |
869 | if (pm->freeze) { |
870 | int error; | |
871 | ||
872 | error = pm->freeze(dev); | |
873 | suspend_report_result(pm->freeze, error); | |
874 | if (error) | |
875 | return error; | |
876 | } | |
877 | ||
699c1985 SO |
878 | if (pcibios_pm_ops.freeze) |
879 | return pcibios_pm_ops.freeze(dev); | |
880 | ||
5294e256 | 881 | return 0; |
bbb44d9f RW |
882 | } |
883 | ||
884 | static int pci_pm_freeze_noirq(struct device *dev) | |
885 | { | |
355a72d7 | 886 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 887 | struct device_driver *drv = dev->driver; |
bbb44d9f | 888 | |
bb808945 RW |
889 | if (pci_has_legacy_pm_support(pci_dev)) |
890 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
891 | ||
d67e37d7 | 892 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
893 | int error; |
894 | ||
d67e37d7 RW |
895 | error = drv->pm->freeze_noirq(dev); |
896 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
897 | if (error) |
898 | return error; | |
bbb44d9f RW |
899 | } |
900 | ||
46939f8b RW |
901 | if (!pci_dev->state_saved) |
902 | pci_save_state(pci_dev); | |
d67e37d7 | 903 | |
46939f8b RW |
904 | pci_pm_set_unknown_state(pci_dev); |
905 | ||
699c1985 SO |
906 | if (pcibios_pm_ops.freeze_noirq) |
907 | return pcibios_pm_ops.freeze_noirq(dev); | |
908 | ||
46939f8b | 909 | return 0; |
bbb44d9f RW |
910 | } |
911 | ||
f6dc1e5e | 912 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 913 | { |
355a72d7 | 914 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
915 | struct device_driver *drv = dev->driver; |
916 | int error = 0; | |
917 | ||
699c1985 SO |
918 | if (pcibios_pm_ops.thaw_noirq) { |
919 | error = pcibios_pm_ops.thaw_noirq(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_early(dev); |
bb808945 | 926 | |
f6dc1e5e | 927 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 928 | |
f6dc1e5e RW |
929 | if (drv && drv->pm && drv->pm->thaw_noirq) |
930 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
931 | |
932 | return error; | |
933 | } | |
934 | ||
f6dc1e5e | 935 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 936 | { |
355a72d7 | 937 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 938 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
939 | int error = 0; |
940 | ||
699c1985 SO |
941 | if (pcibios_pm_ops.thaw) { |
942 | error = pcibios_pm_ops.thaw(dev); | |
943 | if (error) | |
944 | return error; | |
945 | } | |
946 | ||
ad8cfa1d | 947 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 948 | return pci_legacy_resume(dev); |
bb808945 | 949 | |
5294e256 RW |
950 | if (pm) { |
951 | if (pm->thaw) | |
952 | error = pm->thaw(dev); | |
953 | } else { | |
954 | pci_pm_reenable_device(pci_dev); | |
955 | } | |
bbb44d9f | 956 | |
4b77b0a2 RW |
957 | pci_dev->state_saved = false; |
958 | ||
bbb44d9f RW |
959 | return error; |
960 | } | |
961 | ||
962 | static int pci_pm_poweroff(struct device *dev) | |
963 | { | |
355a72d7 | 964 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 965 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 966 | |
ad8cfa1d RW |
967 | if (pci_has_legacy_pm_support(pci_dev)) |
968 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 969 | |
5294e256 RW |
970 | if (!pm) { |
971 | pci_pm_default_suspend(pci_dev); | |
972 | goto Fixup; | |
973 | } | |
974 | ||
7cd0602d RW |
975 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
976 | pm_runtime_resume(dev); | |
977 | ||
82fee4d6 | 978 | pci_dev->state_saved = false; |
5294e256 | 979 | if (pm->poweroff) { |
46939f8b RW |
980 | int error; |
981 | ||
ddb7c9d2 RW |
982 | error = pm->poweroff(dev); |
983 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
984 | if (error) |
985 | return error; | |
bbb44d9f RW |
986 | } |
987 | ||
5294e256 RW |
988 | Fixup: |
989 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 990 | |
699c1985 SO |
991 | if (pcibios_pm_ops.poweroff) |
992 | return pcibios_pm_ops.poweroff(dev); | |
993 | ||
46939f8b | 994 | return 0; |
bbb44d9f RW |
995 | } |
996 | ||
997 | static int pci_pm_poweroff_noirq(struct device *dev) | |
998 | { | |
46939f8b | 999 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1000 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1001 | |
bb808945 RW |
1002 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1003 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1004 | ||
7d2a01b8 AN |
1005 | if (!drv || !drv->pm) { |
1006 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1007 | return 0; |
7d2a01b8 | 1008 | } |
46939f8b RW |
1009 | |
1010 | if (drv->pm->poweroff_noirq) { | |
1011 | int error; | |
1012 | ||
d67e37d7 RW |
1013 | error = drv->pm->poweroff_noirq(dev); |
1014 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1015 | if (error) |
1016 | return error; | |
bbb44d9f RW |
1017 | } |
1018 | ||
326c1cda | 1019 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1020 | pci_prepare_to_sleep(pci_dev); |
1021 | ||
0b68c8e2 RW |
1022 | /* |
1023 | * The reason for doing this here is the same as for the analogous code | |
1024 | * in pci_pm_suspend_noirq(). | |
1025 | */ | |
1026 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1027 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1028 | ||
7d2a01b8 AN |
1029 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1030 | ||
699c1985 SO |
1031 | if (pcibios_pm_ops.poweroff_noirq) |
1032 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1033 | ||
46939f8b | 1034 | return 0; |
bbb44d9f RW |
1035 | } |
1036 | ||
f6dc1e5e | 1037 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1038 | { |
1039 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1040 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1041 | int error = 0; |
bbb44d9f | 1042 | |
699c1985 SO |
1043 | if (pcibios_pm_ops.restore_noirq) { |
1044 | error = pcibios_pm_ops.restore_noirq(dev); | |
1045 | if (error) | |
1046 | return error; | |
1047 | } | |
1048 | ||
6cbf8214 | 1049 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1050 | |
ad8cfa1d | 1051 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1052 | return pci_legacy_resume_early(dev); |
bb808945 | 1053 | |
f6dc1e5e RW |
1054 | if (drv && drv->pm && drv->pm->restore_noirq) |
1055 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1056 | |
1057 | return error; | |
1058 | } | |
1059 | ||
f6dc1e5e | 1060 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1061 | { |
1062 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1063 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1064 | int error = 0; |
1065 | ||
699c1985 SO |
1066 | if (pcibios_pm_ops.restore) { |
1067 | error = pcibios_pm_ops.restore(dev); | |
1068 | if (error) | |
1069 | return error; | |
1070 | } | |
1071 | ||
418e4da3 RW |
1072 | /* |
1073 | * This is necessary for the hibernation error path in which restore is | |
1074 | * called without restoring the standard config registers of the device. | |
1075 | */ | |
1076 | if (pci_dev->state_saved) | |
1077 | pci_restore_standard_config(pci_dev); | |
1078 | ||
ad8cfa1d | 1079 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1080 | return pci_legacy_resume(dev); |
bb808945 | 1081 | |
5294e256 | 1082 | pci_pm_default_resume(pci_dev); |
73410429 | 1083 | |
5294e256 RW |
1084 | if (pm) { |
1085 | if (pm->restore) | |
1086 | error = pm->restore(dev); | |
1087 | } else { | |
1088 | pci_pm_reenable_device(pci_dev); | |
1089 | } | |
bbb44d9f RW |
1090 | |
1091 | return error; | |
c8958177 | 1092 | } |
1da177e4 | 1093 | |
1f112cee | 1094 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1095 | |
1096 | #define pci_pm_freeze NULL | |
1097 | #define pci_pm_freeze_noirq NULL | |
1098 | #define pci_pm_thaw NULL | |
1099 | #define pci_pm_thaw_noirq NULL | |
1100 | #define pci_pm_poweroff NULL | |
1101 | #define pci_pm_poweroff_noirq NULL | |
1102 | #define pci_pm_restore NULL | |
1103 | #define pci_pm_restore_noirq NULL | |
1104 | ||
1f112cee | 1105 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1106 | |
6cbf8214 RW |
1107 | #ifdef CONFIG_PM_RUNTIME |
1108 | ||
1109 | static int pci_pm_runtime_suspend(struct device *dev) | |
1110 | { | |
1111 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1112 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1113 | pci_power_t prev = pci_dev->current_state; | |
1114 | int error; | |
1115 | ||
967577b0 HY |
1116 | /* |
1117 | * If pci_dev->driver is not set (unbound), the device should | |
1118 | * always remain in D0 regardless of the runtime PM status | |
1119 | */ | |
1120 | if (!pci_dev->driver) | |
1121 | return 0; | |
1122 | ||
6cbf8214 RW |
1123 | if (!pm || !pm->runtime_suspend) |
1124 | return -ENOSYS; | |
1125 | ||
82fee4d6 | 1126 | pci_dev->state_saved = false; |
448bd857 | 1127 | pci_dev->no_d3cold = false; |
6cbf8214 RW |
1128 | error = pm->runtime_suspend(dev); |
1129 | suspend_report_result(pm->runtime_suspend, error); | |
1130 | if (error) | |
1131 | return error; | |
448bd857 HY |
1132 | if (!pci_dev->d3cold_allowed) |
1133 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1134 | |
1135 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1136 | ||
1137 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1138 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1139 | WARN_ONCE(pci_dev->current_state != prev, | |
1140 | "PCI PM: State of device not saved by %pF\n", | |
1141 | pm->runtime_suspend); | |
1142 | return 0; | |
1143 | } | |
1144 | ||
42eca230 | 1145 | if (!pci_dev->state_saved) { |
6cbf8214 | 1146 | pci_save_state(pci_dev); |
42eca230 DA |
1147 | pci_finish_runtime_suspend(pci_dev); |
1148 | } | |
6cbf8214 RW |
1149 | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static int pci_pm_runtime_resume(struct device *dev) | |
1154 | { | |
448bd857 | 1155 | int rc; |
6cbf8214 RW |
1156 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1157 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1158 | ||
967577b0 HY |
1159 | /* |
1160 | * If pci_dev->driver is not set (unbound), the device should | |
1161 | * always remain in D0 regardless of the runtime PM status | |
1162 | */ | |
1163 | if (!pci_dev->driver) | |
1164 | return 0; | |
1165 | ||
6cbf8214 RW |
1166 | if (!pm || !pm->runtime_resume) |
1167 | return -ENOSYS; | |
1168 | ||
db288c9c RW |
1169 | pci_restore_standard_config(pci_dev); |
1170 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1171 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1172 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1173 | ||
448bd857 HY |
1174 | rc = pm->runtime_resume(dev); |
1175 | ||
1176 | pci_dev->runtime_d3cold = false; | |
1177 | ||
1178 | return rc; | |
6cbf8214 RW |
1179 | } |
1180 | ||
1181 | static int pci_pm_runtime_idle(struct device *dev) | |
1182 | { | |
967577b0 | 1183 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1184 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1185 | int ret = 0; |
6cbf8214 | 1186 | |
967577b0 HY |
1187 | /* |
1188 | * If pci_dev->driver is not set (unbound), the device should | |
1189 | * always remain in D0 regardless of the runtime PM status | |
1190 | */ | |
1191 | if (!pci_dev->driver) | |
45f0a85c | 1192 | return 0; |
967577b0 | 1193 | |
6cbf8214 RW |
1194 | if (!pm) |
1195 | return -ENOSYS; | |
1196 | ||
45f0a85c RW |
1197 | if (pm->runtime_idle) |
1198 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1199 | |
45f0a85c | 1200 | return ret; |
6cbf8214 RW |
1201 | } |
1202 | ||
1203 | #else /* !CONFIG_PM_RUNTIME */ | |
1204 | ||
1205 | #define pci_pm_runtime_suspend NULL | |
1206 | #define pci_pm_runtime_resume NULL | |
1207 | #define pci_pm_runtime_idle NULL | |
1208 | ||
1209 | #endif /* !CONFIG_PM_RUNTIME */ | |
1210 | ||
aa338601 | 1211 | #ifdef CONFIG_PM |
6cbf8214 | 1212 | |
f91da04d | 1213 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1214 | .prepare = pci_pm_prepare, |
adf09493 RW |
1215 | .suspend = pci_pm_suspend, |
1216 | .resume = pci_pm_resume, | |
1217 | .freeze = pci_pm_freeze, | |
1218 | .thaw = pci_pm_thaw, | |
1219 | .poweroff = pci_pm_poweroff, | |
1220 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1221 | .suspend_noirq = pci_pm_suspend_noirq, |
1222 | .resume_noirq = pci_pm_resume_noirq, | |
1223 | .freeze_noirq = pci_pm_freeze_noirq, | |
1224 | .thaw_noirq = pci_pm_thaw_noirq, | |
1225 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1226 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1227 | .runtime_suspend = pci_pm_runtime_suspend, |
1228 | .runtime_resume = pci_pm_runtime_resume, | |
1229 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1230 | }; |
1231 | ||
adf09493 | 1232 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1233 | |
6cbf8214 | 1234 | #else /* !COMFIG_PM_OPS */ |
bbb44d9f RW |
1235 | |
1236 | #define PCI_PM_OPS_PTR NULL | |
1237 | ||
6cbf8214 | 1238 | #endif /* !COMFIG_PM_OPS */ |
bbb44d9f | 1239 | |
1da177e4 | 1240 | /** |
863b18f4 | 1241 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1242 | * @drv: the driver structure to register |
863b18f4 | 1243 | * @owner: owner module of drv |
f95d882d | 1244 | * @mod_name: module name string |
f7625980 | 1245 | * |
1da177e4 | 1246 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1247 | * Returns a negative value on error, otherwise 0. |
1248 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1249 | * no device was claimed during registration. |
1250 | */ | |
725522b5 GKH |
1251 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1252 | const char *mod_name) | |
1da177e4 | 1253 | { |
1da177e4 LT |
1254 | /* initialize common driver fields */ |
1255 | drv->driver.name = drv->name; | |
1256 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1257 | drv->driver.owner = owner; |
725522b5 | 1258 | drv->driver.mod_name = mod_name; |
50b00755 | 1259 | |
75865858 GKH |
1260 | spin_lock_init(&drv->dynids.lock); |
1261 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1262 | |
1263 | /* register with core */ | |
bfb09a86 | 1264 | return driver_register(&drv->driver); |
1da177e4 | 1265 | } |
b7fe9434 | 1266 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1267 | |
1268 | /** | |
1269 | * pci_unregister_driver - unregister a pci driver | |
1270 | * @drv: the driver structure to unregister | |
f7625980 | 1271 | * |
1da177e4 LT |
1272 | * Deletes the driver structure from the list of registered PCI drivers, |
1273 | * gives it a chance to clean up by calling its remove() function for | |
1274 | * each device it was responsible for, and marks those devices as | |
1275 | * driverless. | |
1276 | */ | |
1277 | ||
3c78bc61 | 1278 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1279 | { |
1280 | driver_unregister(&drv->driver); | |
1281 | pci_free_dynids(drv); | |
1282 | } | |
b7fe9434 | 1283 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1284 | |
1285 | static struct pci_driver pci_compat_driver = { | |
1286 | .name = "compat" | |
1287 | }; | |
1288 | ||
1289 | /** | |
1290 | * pci_dev_driver - get the pci_driver of a device | |
1291 | * @dev: the device to query | |
1292 | * | |
f7625980 | 1293 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1294 | * registered driver for the device. |
1295 | */ | |
3c78bc61 | 1296 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1297 | { |
1298 | if (dev->driver) | |
1299 | return dev->driver; | |
1300 | else { | |
1301 | int i; | |
3c78bc61 | 1302 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1303 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1304 | return &pci_compat_driver; | |
1305 | } | |
1306 | return NULL; | |
1307 | } | |
b7fe9434 | 1308 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1309 | |
1310 | /** | |
1311 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1312 | * @dev: the PCI device structure to match against |
8f7020d3 | 1313 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1314 | * |
1da177e4 | 1315 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1316 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1317 | * pci_device_id structure or %NULL if there is no match. |
1318 | */ | |
75865858 | 1319 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1320 | { |
75865858 | 1321 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1322 | struct pci_driver *pci_drv; |
1da177e4 LT |
1323 | const struct pci_device_id *found_id; |
1324 | ||
58d9a38f YL |
1325 | if (!pci_dev->match_driver) |
1326 | return 0; | |
1327 | ||
1328 | pci_drv = to_pci_driver(drv); | |
75865858 | 1329 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1330 | if (found_id) |
1331 | return 1; | |
1332 | ||
75865858 | 1333 | return 0; |
1da177e4 LT |
1334 | } |
1335 | ||
1336 | /** | |
1337 | * pci_dev_get - increments the reference count of the pci device structure | |
1338 | * @dev: the device being referenced | |
1339 | * | |
1340 | * Each live reference to a device should be refcounted. | |
1341 | * | |
1342 | * Drivers for PCI devices should normally record such references in | |
1343 | * their probe() methods, when they bind to a device, and release | |
1344 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1345 | * | |
1346 | * A pointer to the device with the incremented reference counter is returned. | |
1347 | */ | |
1348 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1349 | { | |
1350 | if (dev) | |
1351 | get_device(&dev->dev); | |
1352 | return dev; | |
1353 | } | |
b7fe9434 | 1354 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1355 | |
1356 | /** | |
1357 | * pci_dev_put - release a use of the pci device structure | |
1358 | * @dev: device that's been disconnected | |
1359 | * | |
1360 | * Must be called when a user of a device is finished with it. When the last | |
1361 | * user of the device calls this function, the memory of the device is freed. | |
1362 | */ | |
1363 | void pci_dev_put(struct pci_dev *dev) | |
1364 | { | |
1365 | if (dev) | |
1366 | put_device(&dev->dev); | |
1367 | } | |
b7fe9434 | 1368 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1369 | |
8ccc9aa1 BP |
1370 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1371 | { | |
1372 | struct pci_dev *pdev; | |
1373 | ||
1374 | if (!dev) | |
1375 | return -ENODEV; | |
1376 | ||
1377 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1378 | |
1379 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1380 | return -ENOMEM; | |
1381 | ||
1382 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1383 | return -ENOMEM; | |
1384 | ||
1385 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1386 | pdev->subsystem_device)) | |
1387 | return -ENOMEM; | |
1388 | ||
1389 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1390 | return -ENOMEM; | |
1391 | ||
1392 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x", | |
1393 | pdev->vendor, pdev->device, | |
1394 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1395 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1396 | (u8)(pdev->class))) | |
1397 | return -ENOMEM; | |
efdd4070 | 1398 | |
8ccc9aa1 BP |
1399 | return 0; |
1400 | } | |
1401 | ||
1da177e4 LT |
1402 | struct bus_type pci_bus_type = { |
1403 | .name = "pci", | |
1404 | .match = pci_bus_match, | |
312c004d | 1405 | .uevent = pci_uevent, |
b15d686a RK |
1406 | .probe = pci_device_probe, |
1407 | .remove = pci_device_remove, | |
cbd69dbb | 1408 | .shutdown = pci_device_shutdown, |
5136b2da | 1409 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1410 | .bus_groups = pci_bus_groups, |
2229c1fb | 1411 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1412 | .pm = PCI_PM_OPS_PTR, |
1da177e4 | 1413 | }; |
b7fe9434 | 1414 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1415 | |
1416 | static int __init pci_driver_init(void) | |
1417 | { | |
1418 | return bus_register(&pci_bus_type); | |
1419 | } | |
1da177e4 | 1420 | postcore_initcall(pci_driver_init); |