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 | |
a8360062 RW |
302 | * supports runtime PM, it should call pm_runtime_put_noidle(), |
303 | * or any other runtime PM helper function decrementing the usage | |
304 | * count, in its probe routine and pm_runtime_get_noresume() in | |
305 | * its remove routine. | |
f3ec4f87 | 306 | */ |
967577b0 HY |
307 | pm_runtime_get_sync(dev); |
308 | pci_dev->driver = pci_drv; | |
309 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
310 | if (!rc) |
311 | return rc; | |
312 | if (rc < 0) { | |
967577b0 HY |
313 | pci_dev->driver = NULL; |
314 | pm_runtime_put_sync(dev); | |
f92d74c1 | 315 | return rc; |
f3ec4f87 | 316 | } |
f92d74c1 SC |
317 | /* |
318 | * Probe function should return < 0 for failure, 0 for success | |
319 | * Treat values > 0 as success, but warn. | |
320 | */ | |
321 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
322 | return 0; | |
873392ca RR |
323 | } |
324 | ||
d42c6997 AK |
325 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
326 | const struct pci_device_id *id) | |
327 | { | |
873392ca RR |
328 | int error, node; |
329 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
330 | ||
12c3156f AD |
331 | /* |
332 | * Execute driver initialization on node where the device is | |
333 | * attached. This way the driver likely allocates its local memory | |
334 | * on the right node. | |
335 | */ | |
873392ca | 336 | node = dev_to_node(&dev->dev); |
12c3156f AD |
337 | |
338 | /* | |
339 | * On NUMA systems, we are likely to call a PF probe function using | |
340 | * work_on_cpu(). If that probe calls pci_enable_sriov() (which | |
341 | * adds the VF devices via pci_bus_add_device()), we may re-enter | |
342 | * this function to call the VF probe function. Calling | |
343 | * work_on_cpu() again will cause a lockdep warning. Since VFs are | |
344 | * always on the same node as the PF, we can work around this by | |
345 | * avoiding work_on_cpu() when we're already on the correct node. | |
346 | * | |
347 | * Preemption is enabled, so it's theoretically unsafe to use | |
348 | * numa_node_id(), but even if we run the probe function on the | |
349 | * wrong node, it should be functionally correct. | |
350 | */ | |
351 | if (node >= 0 && node != numa_node_id()) { | |
873392ca | 352 | int cpu; |
873392ca RR |
353 | |
354 | get_online_cpus(); | |
a70f7302 | 355 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
356 | if (cpu < nr_cpu_ids) |
357 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
358 | else | |
359 | error = local_pci_probe(&ddi); | |
360 | put_online_cpus(); | |
361 | } else | |
362 | error = local_pci_probe(&ddi); | |
12c3156f | 363 | |
d42c6997 AK |
364 | return error; |
365 | } | |
366 | ||
1da177e4 | 367 | /** |
23ea3793 | 368 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
369 | * @drv: driver to call to check if it wants the PCI device |
370 | * @pci_dev: PCI device being probed | |
f7625980 | 371 | * |
8f7020d3 | 372 | * returns 0 on success, else error. |
1da177e4 LT |
373 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
374 | */ | |
3c78bc61 | 375 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
376 | { |
377 | const struct pci_device_id *id; | |
1da177e4 LT |
378 | int error = 0; |
379 | ||
380 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
381 | error = -ENODEV; |
382 | ||
383 | id = pci_match_device(drv, pci_dev); | |
384 | if (id) | |
d42c6997 | 385 | error = pci_call_probe(drv, pci_dev, id); |
967577b0 | 386 | if (error >= 0) |
75865858 | 387 | error = 0; |
1da177e4 LT |
388 | } |
389 | return error; | |
390 | } | |
391 | ||
890e4847 JL |
392 | int __weak pcibios_alloc_irq(struct pci_dev *dev) |
393 | { | |
394 | return 0; | |
395 | } | |
396 | ||
397 | void __weak pcibios_free_irq(struct pci_dev *dev) | |
398 | { | |
399 | } | |
400 | ||
3c78bc61 | 401 | static int pci_device_probe(struct device *dev) |
1da177e4 | 402 | { |
890e4847 JL |
403 | int error; |
404 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
405 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
406 | ||
407 | error = pcibios_alloc_irq(pci_dev); | |
408 | if (error < 0) | |
409 | return error; | |
1da177e4 | 410 | |
1da177e4 LT |
411 | pci_dev_get(pci_dev); |
412 | error = __pci_device_probe(drv, pci_dev); | |
890e4847 JL |
413 | if (error) { |
414 | pcibios_free_irq(pci_dev); | |
1da177e4 | 415 | pci_dev_put(pci_dev); |
890e4847 | 416 | } |
1da177e4 LT |
417 | |
418 | return error; | |
419 | } | |
420 | ||
3c78bc61 | 421 | static int pci_device_remove(struct device *dev) |
1da177e4 | 422 | { |
3c78bc61 RD |
423 | struct pci_dev *pci_dev = to_pci_dev(dev); |
424 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
425 | |
426 | if (drv) { | |
f3ec4f87 AS |
427 | if (drv->remove) { |
428 | pm_runtime_get_sync(dev); | |
1da177e4 | 429 | drv->remove(pci_dev); |
f3ec4f87 AS |
430 | pm_runtime_put_noidle(dev); |
431 | } | |
890e4847 | 432 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
433 | pci_dev->driver = NULL; |
434 | } | |
435 | ||
f3ec4f87 | 436 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 437 | pm_runtime_put_sync(dev); |
f3ec4f87 | 438 | |
2449e06a SL |
439 | /* |
440 | * If the device is still on, set the power state as "unknown", | |
441 | * since it might change by the next time we load the driver. | |
442 | */ | |
443 | if (pci_dev->current_state == PCI_D0) | |
444 | pci_dev->current_state = PCI_UNKNOWN; | |
445 | ||
1da177e4 LT |
446 | /* |
447 | * We would love to complain here if pci_dev->is_enabled is set, that | |
448 | * the driver should have called pci_disable_device(), but the | |
449 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 450 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
451 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
452 | * horrible the crap we have to deal with is when we are awake... | |
453 | */ | |
454 | ||
455 | pci_dev_put(pci_dev); | |
456 | return 0; | |
457 | } | |
458 | ||
bbb44d9f RW |
459 | static void pci_device_shutdown(struct device *dev) |
460 | { | |
461 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
462 | struct pci_driver *drv = pci_dev->driver; | |
463 | ||
3ff2de9b HY |
464 | pm_runtime_resume(dev); |
465 | ||
bbb44d9f RW |
466 | if (drv && drv->shutdown) |
467 | drv->shutdown(pci_dev); | |
468 | pci_msi_shutdown(pci_dev); | |
469 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 470 | |
2965faa5 | 471 | #ifdef CONFIG_KEXEC_CORE |
b566a22c | 472 | /* |
4fc9bbf9 KA |
473 | * If this is a kexec reboot, turn off Bus Master bit on the |
474 | * device to tell it to not continue to do DMA. Don't touch | |
475 | * devices in D3cold or unknown states. | |
476 | * If it is not a kexec reboot, firmware will hit the PCI | |
477 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 478 | */ |
4fc9bbf9 | 479 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 480 | pci_clear_master(pci_dev); |
4fc9bbf9 | 481 | #endif |
bbb44d9f RW |
482 | } |
483 | ||
aa338601 | 484 | #ifdef CONFIG_PM |
6cbf8214 RW |
485 | |
486 | /* Auxiliary functions used for system resume and run-time resume. */ | |
487 | ||
488 | /** | |
489 | * pci_restore_standard_config - restore standard config registers of PCI device | |
490 | * @pci_dev: PCI device to handle | |
491 | */ | |
492 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
493 | { | |
494 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
495 | ||
496 | if (pci_dev->current_state != PCI_D0) { | |
497 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
498 | if (error) | |
499 | return error; | |
500 | } | |
501 | ||
1d3c16a8 JM |
502 | pci_restore_state(pci_dev); |
503 | return 0; | |
6cbf8214 RW |
504 | } |
505 | ||
db288c9c RW |
506 | #endif |
507 | ||
508 | #ifdef CONFIG_PM_SLEEP | |
509 | ||
6cbf8214 RW |
510 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
511 | { | |
db288c9c RW |
512 | pci_power_up(pci_dev); |
513 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
514 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
515 | } | |
516 | ||
fa58d305 RW |
517 | /* |
518 | * Default "suspend" method for devices that have no driver provided suspend, | |
519 | * or not even a driver at all (second part). | |
bbb44d9f | 520 | */ |
bb808945 | 521 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 522 | { |
bbb44d9f RW |
523 | /* |
524 | * mark its power state as "unknown", since we don't know if | |
525 | * e.g. the BIOS will change its device state when we suspend. | |
526 | */ | |
527 | if (pci_dev->current_state == PCI_D0) | |
528 | pci_dev->current_state = PCI_UNKNOWN; | |
529 | } | |
530 | ||
355a72d7 RW |
531 | /* |
532 | * Default "resume" method for devices that have no driver provided resume, | |
533 | * or not even a driver at all (second part). | |
534 | */ | |
bb808945 | 535 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
536 | { |
537 | int retval; | |
538 | ||
bbb44d9f RW |
539 | /* if the device was enabled before suspend, reenable */ |
540 | retval = pci_reenable_device(pci_dev); | |
541 | /* | |
542 | * if the device was busmaster before the suspend, make it busmaster | |
543 | * again | |
544 | */ | |
545 | if (pci_dev->is_busmaster) | |
546 | pci_set_master(pci_dev); | |
547 | ||
548 | return retval; | |
549 | } | |
550 | ||
551 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 552 | { |
3c78bc61 RD |
553 | struct pci_dev *pci_dev = to_pci_dev(dev); |
554 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 555 | |
02669492 | 556 | if (drv && drv->suspend) { |
99dadce8 | 557 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 558 | int error; |
aa8c6c93 | 559 | |
57ef8026 FP |
560 | error = drv->suspend(pci_dev, state); |
561 | suspend_report_result(drv->suspend, error); | |
562 | if (error) | |
563 | return error; | |
aa8c6c93 | 564 | |
46939f8b | 565 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
566 | && pci_dev->current_state != PCI_UNKNOWN) { |
567 | WARN_ONCE(pci_dev->current_state != prev, | |
568 | "PCI PM: Device state not saved by %pF\n", | |
569 | drv->suspend); | |
99dadce8 | 570 | } |
02669492 | 571 | } |
ad8cfa1d RW |
572 | |
573 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
574 | ||
46939f8b | 575 | return 0; |
1da177e4 LT |
576 | } |
577 | ||
bbb44d9f | 578 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 579 | { |
3c78bc61 RD |
580 | struct pci_dev *pci_dev = to_pci_dev(dev); |
581 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
582 | |
583 | if (drv && drv->suspend_late) { | |
46939f8b RW |
584 | pci_power_t prev = pci_dev->current_state; |
585 | int error; | |
586 | ||
57ef8026 FP |
587 | error = drv->suspend_late(pci_dev, state); |
588 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
589 | if (error) |
590 | return error; | |
591 | ||
592 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
593 | && pci_dev->current_state != PCI_UNKNOWN) { | |
594 | WARN_ONCE(pci_dev->current_state != prev, | |
595 | "PCI PM: Device state not saved by %pF\n", | |
596 | drv->suspend_late); | |
7d2a01b8 | 597 | goto Fixup; |
46939f8b | 598 | } |
cbd69dbb | 599 | } |
46939f8b RW |
600 | |
601 | if (!pci_dev->state_saved) | |
602 | pci_save_state(pci_dev); | |
603 | ||
604 | pci_pm_set_unknown_state(pci_dev); | |
605 | ||
7d2a01b8 AN |
606 | Fixup: |
607 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
608 | ||
46939f8b | 609 | return 0; |
cbd69dbb | 610 | } |
1da177e4 | 611 | |
f6dc1e5e RW |
612 | static int pci_legacy_resume_early(struct device *dev) |
613 | { | |
3c78bc61 RD |
614 | struct pci_dev *pci_dev = to_pci_dev(dev); |
615 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 616 | |
aa8c6c93 RW |
617 | return drv && drv->resume_early ? |
618 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
619 | } |
620 | ||
bbb44d9f | 621 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 622 | { |
3c78bc61 RD |
623 | struct pci_dev *pci_dev = to_pci_dev(dev); |
624 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 625 | |
ad8cfa1d RW |
626 | pci_fixup_device(pci_fixup_resume, pci_dev); |
627 | ||
aa8c6c93 RW |
628 | return drv && drv->resume ? |
629 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
630 | } |
631 | ||
571ff758 RW |
632 | /* Auxiliary functions used by the new power management framework */ |
633 | ||
5294e256 | 634 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 635 | { |
73410429 RW |
636 | pci_fixup_device(pci_fixup_resume, pci_dev); |
637 | ||
326c1cda | 638 | if (!pci_has_subordinate(pci_dev)) |
5294e256 | 639 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
640 | } |
641 | ||
5294e256 | 642 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 643 | { |
5294e256 | 644 | /* Disable non-bridge devices without PM support */ |
326c1cda | 645 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 646 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
647 | } |
648 | ||
07e836e8 RW |
649 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
650 | { | |
651 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 652 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 653 | || drv->resume_early); |
bb808945 RW |
654 | |
655 | /* | |
656 | * Legacy PM support is used by default, so warn if the new framework is | |
657 | * supported as well. Drivers are supposed to support either the | |
658 | * former, or the latter, but not both at the same time. | |
659 | */ | |
82440a82 DF |
660 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
661 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
662 | |
663 | return ret; | |
07e836e8 RW |
664 | } |
665 | ||
571ff758 RW |
666 | /* New power management framework */ |
667 | ||
bbb44d9f RW |
668 | static int pci_pm_prepare(struct device *dev) |
669 | { | |
670 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 671 | |
6cbf8214 | 672 | /* |
7cd0602d RW |
673 | * Devices having power.ignore_children set may still be necessary for |
674 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 675 | */ |
7cd0602d RW |
676 | if (dev->power.ignore_children) |
677 | pm_runtime_resume(dev); | |
6cbf8214 | 678 | |
bac2a909 RW |
679 | if (drv && drv->pm && drv->pm->prepare) { |
680 | int error = drv->pm->prepare(dev); | |
681 | if (error) | |
682 | return error; | |
683 | } | |
684 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
685 | } |
686 | ||
2cef548a RW |
687 | static void pci_pm_complete(struct device *dev) |
688 | { | |
c2df86ea RW |
689 | pci_dev_complete_resume(to_pci_dev(dev)); |
690 | pm_generic_complete(dev); | |
2cef548a | 691 | } |
bbb44d9f | 692 | |
6cbf8214 RW |
693 | #else /* !CONFIG_PM_SLEEP */ |
694 | ||
695 | #define pci_pm_prepare NULL | |
2cef548a | 696 | #define pci_pm_complete NULL |
6cbf8214 RW |
697 | |
698 | #endif /* !CONFIG_PM_SLEEP */ | |
699 | ||
bbb44d9f RW |
700 | #ifdef CONFIG_SUSPEND |
701 | ||
702 | static int pci_pm_suspend(struct device *dev) | |
703 | { | |
704 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 705 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 706 | |
ad8cfa1d RW |
707 | if (pci_has_legacy_pm_support(pci_dev)) |
708 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 709 | |
5294e256 RW |
710 | if (!pm) { |
711 | pci_pm_default_suspend(pci_dev); | |
712 | goto Fixup; | |
713 | } | |
714 | ||
7cd0602d RW |
715 | /* |
716 | * PCI devices suspended at run time need to be resumed at this point, | |
717 | * because in general it is necessary to reconfigure them for system | |
718 | * suspend. Namely, if the device is supposed to wake up the system | |
719 | * from the sleep state, we may need to reconfigure it for this purpose. | |
720 | * In turn, if the device is not supposed to wake up the system from the | |
721 | * sleep state, we'll have to prevent it from signaling wake-up. | |
722 | */ | |
723 | pm_runtime_resume(dev); | |
724 | ||
82fee4d6 | 725 | pci_dev->state_saved = false; |
5294e256 RW |
726 | if (pm->suspend) { |
727 | pci_power_t prev = pci_dev->current_state; | |
728 | int error; | |
729 | ||
ddb7c9d2 RW |
730 | error = pm->suspend(dev); |
731 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
732 | if (error) |
733 | return error; | |
734 | ||
46939f8b | 735 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
736 | && pci_dev->current_state != PCI_UNKNOWN) { |
737 | WARN_ONCE(pci_dev->current_state != prev, | |
738 | "PCI PM: State of device not saved by %pF\n", | |
739 | pm->suspend); | |
5294e256 | 740 | } |
bbb44d9f | 741 | } |
fa58d305 | 742 | |
5294e256 RW |
743 | Fixup: |
744 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
745 | ||
746 | return 0; | |
bbb44d9f RW |
747 | } |
748 | ||
749 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 750 | { |
355a72d7 | 751 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 752 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 753 | |
bb808945 RW |
754 | if (pci_has_legacy_pm_support(pci_dev)) |
755 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
756 | ||
931ff68a RW |
757 | if (!pm) { |
758 | pci_save_state(pci_dev); | |
7d2a01b8 | 759 | goto Fixup; |
931ff68a | 760 | } |
46939f8b RW |
761 | |
762 | if (pm->suspend_noirq) { | |
763 | pci_power_t prev = pci_dev->current_state; | |
764 | int error; | |
765 | ||
766 | error = pm->suspend_noirq(dev); | |
767 | suspend_report_result(pm->suspend_noirq, error); | |
768 | if (error) | |
769 | return error; | |
770 | ||
771 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
772 | && pci_dev->current_state != PCI_UNKNOWN) { | |
773 | WARN_ONCE(pci_dev->current_state != prev, | |
774 | "PCI PM: State of device not saved by %pF\n", | |
775 | pm->suspend_noirq); | |
7d2a01b8 | 776 | goto Fixup; |
46939f8b | 777 | } |
bbb44d9f RW |
778 | } |
779 | ||
46939f8b RW |
780 | if (!pci_dev->state_saved) { |
781 | pci_save_state(pci_dev); | |
326c1cda | 782 | if (!pci_has_subordinate(pci_dev)) |
46939f8b RW |
783 | pci_prepare_to_sleep(pci_dev); |
784 | } | |
d67e37d7 | 785 | |
46939f8b RW |
786 | pci_pm_set_unknown_state(pci_dev); |
787 | ||
dbf0e4c7 AS |
788 | /* |
789 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
790 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
791 | * hasn't been quiesced and tries to turn it off. If the controller | |
792 | * is already in D3, this can hang or cause memory corruption. | |
793 | * | |
794 | * Since the value of the COMMAND register doesn't matter once the | |
795 | * device has been suspended, we can safely set it to 0 here. | |
796 | */ | |
797 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
798 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
799 | ||
7d2a01b8 AN |
800 | Fixup: |
801 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
802 | ||
46939f8b | 803 | return 0; |
c8958177 | 804 | } |
1da177e4 | 805 | |
f6dc1e5e | 806 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
807 | { |
808 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
809 | struct device_driver *drv = dev->driver; | |
355a72d7 | 810 | int error = 0; |
bbb44d9f | 811 | |
6cbf8214 | 812 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 813 | |
ad8cfa1d | 814 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 815 | return pci_legacy_resume_early(dev); |
bb808945 | 816 | |
f6dc1e5e RW |
817 | if (drv && drv->pm && drv->pm->resume_noirq) |
818 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
819 | |
820 | return error; | |
821 | } | |
822 | ||
f6dc1e5e | 823 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 824 | { |
355a72d7 | 825 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 826 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
827 | int error = 0; |
828 | ||
418e4da3 RW |
829 | /* |
830 | * This is necessary for the suspend error path in which resume is | |
831 | * called without restoring the standard config registers of the device. | |
832 | */ | |
833 | if (pci_dev->state_saved) | |
834 | pci_restore_standard_config(pci_dev); | |
835 | ||
ad8cfa1d | 836 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 837 | return pci_legacy_resume(dev); |
bb808945 | 838 | |
5294e256 | 839 | pci_pm_default_resume(pci_dev); |
73410429 | 840 | |
5294e256 RW |
841 | if (pm) { |
842 | if (pm->resume) | |
843 | error = pm->resume(dev); | |
844 | } else { | |
845 | pci_pm_reenable_device(pci_dev); | |
846 | } | |
bbb44d9f | 847 | |
999cce4a | 848 | return error; |
bbb44d9f RW |
849 | } |
850 | ||
851 | #else /* !CONFIG_SUSPEND */ | |
852 | ||
853 | #define pci_pm_suspend NULL | |
854 | #define pci_pm_suspend_noirq NULL | |
855 | #define pci_pm_resume NULL | |
856 | #define pci_pm_resume_noirq NULL | |
857 | ||
858 | #endif /* !CONFIG_SUSPEND */ | |
859 | ||
1f112cee | 860 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 861 | |
699c1985 SO |
862 | |
863 | /* | |
864 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
865 | * a hibernate transition | |
866 | */ | |
867 | struct dev_pm_ops __weak pcibios_pm_ops; | |
868 | ||
bbb44d9f RW |
869 | static int pci_pm_freeze(struct device *dev) |
870 | { | |
871 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 872 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 873 | |
ad8cfa1d RW |
874 | if (pci_has_legacy_pm_support(pci_dev)) |
875 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 876 | |
5294e256 RW |
877 | if (!pm) { |
878 | pci_pm_default_suspend(pci_dev); | |
879 | return 0; | |
bbb44d9f RW |
880 | } |
881 | ||
7cd0602d RW |
882 | /* |
883 | * This used to be done in pci_pm_prepare() for all devices and some | |
884 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
885 | * devices should not be touched during freeze/thaw transitions, | |
886 | * however. | |
887 | */ | |
888 | pm_runtime_resume(dev); | |
889 | ||
82fee4d6 | 890 | pci_dev->state_saved = false; |
5294e256 RW |
891 | if (pm->freeze) { |
892 | int error; | |
893 | ||
894 | error = pm->freeze(dev); | |
895 | suspend_report_result(pm->freeze, error); | |
896 | if (error) | |
897 | return error; | |
898 | } | |
899 | ||
699c1985 SO |
900 | if (pcibios_pm_ops.freeze) |
901 | return pcibios_pm_ops.freeze(dev); | |
902 | ||
5294e256 | 903 | return 0; |
bbb44d9f RW |
904 | } |
905 | ||
906 | static int pci_pm_freeze_noirq(struct device *dev) | |
907 | { | |
355a72d7 | 908 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 909 | struct device_driver *drv = dev->driver; |
bbb44d9f | 910 | |
bb808945 RW |
911 | if (pci_has_legacy_pm_support(pci_dev)) |
912 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
913 | ||
d67e37d7 | 914 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
915 | int error; |
916 | ||
d67e37d7 RW |
917 | error = drv->pm->freeze_noirq(dev); |
918 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
919 | if (error) |
920 | return error; | |
bbb44d9f RW |
921 | } |
922 | ||
46939f8b RW |
923 | if (!pci_dev->state_saved) |
924 | pci_save_state(pci_dev); | |
d67e37d7 | 925 | |
46939f8b RW |
926 | pci_pm_set_unknown_state(pci_dev); |
927 | ||
699c1985 SO |
928 | if (pcibios_pm_ops.freeze_noirq) |
929 | return pcibios_pm_ops.freeze_noirq(dev); | |
930 | ||
46939f8b | 931 | return 0; |
bbb44d9f RW |
932 | } |
933 | ||
f6dc1e5e | 934 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 935 | { |
355a72d7 | 936 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
937 | struct device_driver *drv = dev->driver; |
938 | int error = 0; | |
939 | ||
699c1985 SO |
940 | if (pcibios_pm_ops.thaw_noirq) { |
941 | error = pcibios_pm_ops.thaw_noirq(dev); | |
942 | if (error) | |
943 | return error; | |
944 | } | |
945 | ||
ad8cfa1d | 946 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 947 | return pci_legacy_resume_early(dev); |
bb808945 | 948 | |
f6dc1e5e | 949 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 950 | |
f6dc1e5e RW |
951 | if (drv && drv->pm && drv->pm->thaw_noirq) |
952 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
953 | |
954 | return error; | |
955 | } | |
956 | ||
f6dc1e5e | 957 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 958 | { |
355a72d7 | 959 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 960 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
961 | int error = 0; |
962 | ||
699c1985 SO |
963 | if (pcibios_pm_ops.thaw) { |
964 | error = pcibios_pm_ops.thaw(dev); | |
965 | if (error) | |
966 | return error; | |
967 | } | |
968 | ||
ad8cfa1d | 969 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 970 | return pci_legacy_resume(dev); |
bb808945 | 971 | |
5294e256 RW |
972 | if (pm) { |
973 | if (pm->thaw) | |
974 | error = pm->thaw(dev); | |
975 | } else { | |
976 | pci_pm_reenable_device(pci_dev); | |
977 | } | |
bbb44d9f | 978 | |
4b77b0a2 RW |
979 | pci_dev->state_saved = false; |
980 | ||
bbb44d9f RW |
981 | return error; |
982 | } | |
983 | ||
984 | static int pci_pm_poweroff(struct device *dev) | |
985 | { | |
355a72d7 | 986 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 987 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 988 | |
ad8cfa1d RW |
989 | if (pci_has_legacy_pm_support(pci_dev)) |
990 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 991 | |
5294e256 RW |
992 | if (!pm) { |
993 | pci_pm_default_suspend(pci_dev); | |
994 | goto Fixup; | |
995 | } | |
996 | ||
7cd0602d RW |
997 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
998 | pm_runtime_resume(dev); | |
999 | ||
82fee4d6 | 1000 | pci_dev->state_saved = false; |
5294e256 | 1001 | if (pm->poweroff) { |
46939f8b RW |
1002 | int error; |
1003 | ||
ddb7c9d2 RW |
1004 | error = pm->poweroff(dev); |
1005 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1006 | if (error) |
1007 | return error; | |
bbb44d9f RW |
1008 | } |
1009 | ||
5294e256 RW |
1010 | Fixup: |
1011 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 1012 | |
699c1985 SO |
1013 | if (pcibios_pm_ops.poweroff) |
1014 | return pcibios_pm_ops.poweroff(dev); | |
1015 | ||
46939f8b | 1016 | return 0; |
bbb44d9f RW |
1017 | } |
1018 | ||
1019 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1020 | { | |
46939f8b | 1021 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1022 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1023 | |
bb808945 RW |
1024 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1025 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1026 | ||
7d2a01b8 AN |
1027 | if (!drv || !drv->pm) { |
1028 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1029 | return 0; |
7d2a01b8 | 1030 | } |
46939f8b RW |
1031 | |
1032 | if (drv->pm->poweroff_noirq) { | |
1033 | int error; | |
1034 | ||
d67e37d7 RW |
1035 | error = drv->pm->poweroff_noirq(dev); |
1036 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1037 | if (error) |
1038 | return error; | |
bbb44d9f RW |
1039 | } |
1040 | ||
326c1cda | 1041 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1042 | pci_prepare_to_sleep(pci_dev); |
1043 | ||
0b68c8e2 RW |
1044 | /* |
1045 | * The reason for doing this here is the same as for the analogous code | |
1046 | * in pci_pm_suspend_noirq(). | |
1047 | */ | |
1048 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1049 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1050 | ||
7d2a01b8 AN |
1051 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1052 | ||
699c1985 SO |
1053 | if (pcibios_pm_ops.poweroff_noirq) |
1054 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1055 | ||
46939f8b | 1056 | return 0; |
bbb44d9f RW |
1057 | } |
1058 | ||
f6dc1e5e | 1059 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1060 | { |
1061 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1062 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1063 | int error = 0; |
bbb44d9f | 1064 | |
699c1985 SO |
1065 | if (pcibios_pm_ops.restore_noirq) { |
1066 | error = pcibios_pm_ops.restore_noirq(dev); | |
1067 | if (error) | |
1068 | return error; | |
1069 | } | |
1070 | ||
6cbf8214 | 1071 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1072 | |
ad8cfa1d | 1073 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1074 | return pci_legacy_resume_early(dev); |
bb808945 | 1075 | |
f6dc1e5e RW |
1076 | if (drv && drv->pm && drv->pm->restore_noirq) |
1077 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1078 | |
1079 | return error; | |
1080 | } | |
1081 | ||
f6dc1e5e | 1082 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1083 | { |
1084 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1085 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1086 | int error = 0; |
1087 | ||
699c1985 SO |
1088 | if (pcibios_pm_ops.restore) { |
1089 | error = pcibios_pm_ops.restore(dev); | |
1090 | if (error) | |
1091 | return error; | |
1092 | } | |
1093 | ||
418e4da3 RW |
1094 | /* |
1095 | * This is necessary for the hibernation error path in which restore is | |
1096 | * called without restoring the standard config registers of the device. | |
1097 | */ | |
1098 | if (pci_dev->state_saved) | |
1099 | pci_restore_standard_config(pci_dev); | |
1100 | ||
ad8cfa1d | 1101 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1102 | return pci_legacy_resume(dev); |
bb808945 | 1103 | |
5294e256 | 1104 | pci_pm_default_resume(pci_dev); |
73410429 | 1105 | |
5294e256 RW |
1106 | if (pm) { |
1107 | if (pm->restore) | |
1108 | error = pm->restore(dev); | |
1109 | } else { | |
1110 | pci_pm_reenable_device(pci_dev); | |
1111 | } | |
bbb44d9f RW |
1112 | |
1113 | return error; | |
c8958177 | 1114 | } |
1da177e4 | 1115 | |
1f112cee | 1116 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1117 | |
1118 | #define pci_pm_freeze NULL | |
1119 | #define pci_pm_freeze_noirq NULL | |
1120 | #define pci_pm_thaw NULL | |
1121 | #define pci_pm_thaw_noirq NULL | |
1122 | #define pci_pm_poweroff NULL | |
1123 | #define pci_pm_poweroff_noirq NULL | |
1124 | #define pci_pm_restore NULL | |
1125 | #define pci_pm_restore_noirq NULL | |
1126 | ||
1f112cee | 1127 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1128 | |
fbb988be | 1129 | #ifdef CONFIG_PM |
6cbf8214 RW |
1130 | |
1131 | static int pci_pm_runtime_suspend(struct device *dev) | |
1132 | { | |
1133 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1134 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1135 | pci_power_t prev = pci_dev->current_state; | |
1136 | int error; | |
1137 | ||
967577b0 HY |
1138 | /* |
1139 | * If pci_dev->driver is not set (unbound), the device should | |
1140 | * always remain in D0 regardless of the runtime PM status | |
1141 | */ | |
1142 | if (!pci_dev->driver) | |
1143 | return 0; | |
1144 | ||
6cbf8214 RW |
1145 | if (!pm || !pm->runtime_suspend) |
1146 | return -ENOSYS; | |
1147 | ||
82fee4d6 | 1148 | pci_dev->state_saved = false; |
448bd857 | 1149 | pci_dev->no_d3cold = false; |
6cbf8214 RW |
1150 | error = pm->runtime_suspend(dev); |
1151 | suspend_report_result(pm->runtime_suspend, error); | |
1152 | if (error) | |
1153 | return error; | |
448bd857 HY |
1154 | if (!pci_dev->d3cold_allowed) |
1155 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1156 | |
1157 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1158 | ||
1159 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1160 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1161 | WARN_ONCE(pci_dev->current_state != prev, | |
1162 | "PCI PM: State of device not saved by %pF\n", | |
1163 | pm->runtime_suspend); | |
1164 | return 0; | |
1165 | } | |
1166 | ||
42eca230 | 1167 | if (!pci_dev->state_saved) { |
6cbf8214 | 1168 | pci_save_state(pci_dev); |
42eca230 DA |
1169 | pci_finish_runtime_suspend(pci_dev); |
1170 | } | |
6cbf8214 RW |
1171 | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | static int pci_pm_runtime_resume(struct device *dev) | |
1176 | { | |
448bd857 | 1177 | int rc; |
6cbf8214 RW |
1178 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1179 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1180 | ||
967577b0 HY |
1181 | /* |
1182 | * If pci_dev->driver is not set (unbound), the device should | |
1183 | * always remain in D0 regardless of the runtime PM status | |
1184 | */ | |
1185 | if (!pci_dev->driver) | |
1186 | return 0; | |
1187 | ||
6cbf8214 RW |
1188 | if (!pm || !pm->runtime_resume) |
1189 | return -ENOSYS; | |
1190 | ||
db288c9c RW |
1191 | pci_restore_standard_config(pci_dev); |
1192 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1193 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1194 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1195 | ||
448bd857 HY |
1196 | rc = pm->runtime_resume(dev); |
1197 | ||
1198 | pci_dev->runtime_d3cold = false; | |
1199 | ||
1200 | return rc; | |
6cbf8214 RW |
1201 | } |
1202 | ||
1203 | static int pci_pm_runtime_idle(struct device *dev) | |
1204 | { | |
967577b0 | 1205 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1206 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1207 | int ret = 0; |
6cbf8214 | 1208 | |
967577b0 HY |
1209 | /* |
1210 | * If pci_dev->driver is not set (unbound), the device should | |
1211 | * always remain in D0 regardless of the runtime PM status | |
1212 | */ | |
1213 | if (!pci_dev->driver) | |
45f0a85c | 1214 | return 0; |
967577b0 | 1215 | |
6cbf8214 RW |
1216 | if (!pm) |
1217 | return -ENOSYS; | |
1218 | ||
45f0a85c RW |
1219 | if (pm->runtime_idle) |
1220 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1221 | |
45f0a85c | 1222 | return ret; |
6cbf8214 RW |
1223 | } |
1224 | ||
f91da04d | 1225 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1226 | .prepare = pci_pm_prepare, |
2cef548a | 1227 | .complete = pci_pm_complete, |
adf09493 RW |
1228 | .suspend = pci_pm_suspend, |
1229 | .resume = pci_pm_resume, | |
1230 | .freeze = pci_pm_freeze, | |
1231 | .thaw = pci_pm_thaw, | |
1232 | .poweroff = pci_pm_poweroff, | |
1233 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1234 | .suspend_noirq = pci_pm_suspend_noirq, |
1235 | .resume_noirq = pci_pm_resume_noirq, | |
1236 | .freeze_noirq = pci_pm_freeze_noirq, | |
1237 | .thaw_noirq = pci_pm_thaw_noirq, | |
1238 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1239 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1240 | .runtime_suspend = pci_pm_runtime_suspend, |
1241 | .runtime_resume = pci_pm_runtime_resume, | |
1242 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1243 | }; |
1244 | ||
adf09493 | 1245 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1246 | |
fbb988be RW |
1247 | #else /* !CONFIG_PM */ |
1248 | ||
1249 | #define pci_pm_runtime_suspend NULL | |
1250 | #define pci_pm_runtime_resume NULL | |
1251 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1252 | |
1253 | #define PCI_PM_OPS_PTR NULL | |
1254 | ||
fbb988be | 1255 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1256 | |
1da177e4 | 1257 | /** |
863b18f4 | 1258 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1259 | * @drv: the driver structure to register |
863b18f4 | 1260 | * @owner: owner module of drv |
f95d882d | 1261 | * @mod_name: module name string |
f7625980 | 1262 | * |
1da177e4 | 1263 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1264 | * Returns a negative value on error, otherwise 0. |
1265 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1266 | * no device was claimed during registration. |
1267 | */ | |
725522b5 GKH |
1268 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1269 | const char *mod_name) | |
1da177e4 | 1270 | { |
1da177e4 LT |
1271 | /* initialize common driver fields */ |
1272 | drv->driver.name = drv->name; | |
1273 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1274 | drv->driver.owner = owner; |
725522b5 | 1275 | drv->driver.mod_name = mod_name; |
50b00755 | 1276 | |
75865858 GKH |
1277 | spin_lock_init(&drv->dynids.lock); |
1278 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1279 | |
1280 | /* register with core */ | |
bfb09a86 | 1281 | return driver_register(&drv->driver); |
1da177e4 | 1282 | } |
b7fe9434 | 1283 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1284 | |
1285 | /** | |
1286 | * pci_unregister_driver - unregister a pci driver | |
1287 | * @drv: the driver structure to unregister | |
f7625980 | 1288 | * |
1da177e4 LT |
1289 | * Deletes the driver structure from the list of registered PCI drivers, |
1290 | * gives it a chance to clean up by calling its remove() function for | |
1291 | * each device it was responsible for, and marks those devices as | |
1292 | * driverless. | |
1293 | */ | |
1294 | ||
3c78bc61 | 1295 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1296 | { |
1297 | driver_unregister(&drv->driver); | |
1298 | pci_free_dynids(drv); | |
1299 | } | |
b7fe9434 | 1300 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1301 | |
1302 | static struct pci_driver pci_compat_driver = { | |
1303 | .name = "compat" | |
1304 | }; | |
1305 | ||
1306 | /** | |
1307 | * pci_dev_driver - get the pci_driver of a device | |
1308 | * @dev: the device to query | |
1309 | * | |
f7625980 | 1310 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1311 | * registered driver for the device. |
1312 | */ | |
3c78bc61 | 1313 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1314 | { |
1315 | if (dev->driver) | |
1316 | return dev->driver; | |
1317 | else { | |
1318 | int i; | |
3c78bc61 | 1319 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1320 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1321 | return &pci_compat_driver; | |
1322 | } | |
1323 | return NULL; | |
1324 | } | |
b7fe9434 | 1325 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1326 | |
1327 | /** | |
1328 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1329 | * @dev: the PCI device structure to match against |
8f7020d3 | 1330 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1331 | * |
1da177e4 | 1332 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1333 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1334 | * pci_device_id structure or %NULL if there is no match. |
1335 | */ | |
75865858 | 1336 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1337 | { |
75865858 | 1338 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1339 | struct pci_driver *pci_drv; |
1da177e4 LT |
1340 | const struct pci_device_id *found_id; |
1341 | ||
58d9a38f YL |
1342 | if (!pci_dev->match_driver) |
1343 | return 0; | |
1344 | ||
1345 | pci_drv = to_pci_driver(drv); | |
75865858 | 1346 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1347 | if (found_id) |
1348 | return 1; | |
1349 | ||
75865858 | 1350 | return 0; |
1da177e4 LT |
1351 | } |
1352 | ||
1353 | /** | |
1354 | * pci_dev_get - increments the reference count of the pci device structure | |
1355 | * @dev: the device being referenced | |
1356 | * | |
1357 | * Each live reference to a device should be refcounted. | |
1358 | * | |
1359 | * Drivers for PCI devices should normally record such references in | |
1360 | * their probe() methods, when they bind to a device, and release | |
1361 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1362 | * | |
1363 | * A pointer to the device with the incremented reference counter is returned. | |
1364 | */ | |
1365 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1366 | { | |
1367 | if (dev) | |
1368 | get_device(&dev->dev); | |
1369 | return dev; | |
1370 | } | |
b7fe9434 | 1371 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1372 | |
1373 | /** | |
1374 | * pci_dev_put - release a use of the pci device structure | |
1375 | * @dev: device that's been disconnected | |
1376 | * | |
1377 | * Must be called when a user of a device is finished with it. When the last | |
1378 | * user of the device calls this function, the memory of the device is freed. | |
1379 | */ | |
1380 | void pci_dev_put(struct pci_dev *dev) | |
1381 | { | |
1382 | if (dev) | |
1383 | put_device(&dev->dev); | |
1384 | } | |
b7fe9434 | 1385 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1386 | |
8ccc9aa1 BP |
1387 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1388 | { | |
1389 | struct pci_dev *pdev; | |
1390 | ||
1391 | if (!dev) | |
1392 | return -ENODEV; | |
1393 | ||
1394 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1395 | |
1396 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1397 | return -ENOMEM; | |
1398 | ||
1399 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1400 | return -ENOMEM; | |
1401 | ||
1402 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1403 | pdev->subsystem_device)) | |
1404 | return -ENOMEM; | |
1405 | ||
1406 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1407 | return -ENOMEM; | |
1408 | ||
145b3fe5 | 1409 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1410 | pdev->vendor, pdev->device, |
1411 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1412 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1413 | (u8)(pdev->class))) | |
1414 | return -ENOMEM; | |
efdd4070 | 1415 | |
8ccc9aa1 BP |
1416 | return 0; |
1417 | } | |
1418 | ||
1da177e4 LT |
1419 | struct bus_type pci_bus_type = { |
1420 | .name = "pci", | |
1421 | .match = pci_bus_match, | |
312c004d | 1422 | .uevent = pci_uevent, |
b15d686a RK |
1423 | .probe = pci_device_probe, |
1424 | .remove = pci_device_remove, | |
cbd69dbb | 1425 | .shutdown = pci_device_shutdown, |
5136b2da | 1426 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1427 | .bus_groups = pci_bus_groups, |
2229c1fb | 1428 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1429 | .pm = PCI_PM_OPS_PTR, |
1da177e4 | 1430 | }; |
b7fe9434 | 1431 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1432 | |
1433 | static int __init pci_driver_init(void) | |
1434 | { | |
1435 | return bus_register(&pci_bus_type); | |
1436 | } | |
1da177e4 | 1437 | postcore_initcall(pci_driver_init); |