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; | |
9222097f | 175 | size_t retval = -ENODEV; |
0994375e CW |
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); | |
9222097f | 193 | retval = count; |
0994375e CW |
194 | break; |
195 | } | |
196 | } | |
197 | spin_unlock(&pdrv->dynids.lock); | |
198 | ||
9222097f | 199 | return retval; |
0994375e | 200 | } |
2229c1fb | 201 | static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id); |
0994375e | 202 | |
2229c1fb GKH |
203 | static struct attribute *pci_drv_attrs[] = { |
204 | &driver_attr_new_id.attr, | |
205 | &driver_attr_remove_id.attr, | |
206 | NULL, | |
bfb09a86 | 207 | }; |
2229c1fb | 208 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 209 | |
1da177e4 | 210 | /** |
75865858 | 211 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 212 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
213 | * @dev: the PCI device structure to match against. |
214 | * | |
1da177e4 | 215 | * Used by a driver to check whether a PCI device present in the |
75865858 | 216 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 217 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 218 | * |
8b60756a | 219 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 220 | * that a driver might want to check for. |
1da177e4 | 221 | */ |
75865858 GKH |
222 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
223 | struct pci_dev *dev) | |
1da177e4 | 224 | { |
75865858 GKH |
225 | if (ids) { |
226 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
227 | if (pci_match_one_device(ids, dev)) | |
228 | return ids; | |
229 | ids++; | |
230 | } | |
1da177e4 LT |
231 | } |
232 | return NULL; | |
233 | } | |
b7fe9434 | 234 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 235 | |
782a985d AW |
236 | static const struct pci_device_id pci_device_id_any = { |
237 | .vendor = PCI_ANY_ID, | |
238 | .device = PCI_ANY_ID, | |
239 | .subvendor = PCI_ANY_ID, | |
240 | .subdevice = PCI_ANY_ID, | |
241 | }; | |
242 | ||
1da177e4 | 243 | /** |
ae9608af | 244 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 245 | * @drv: the PCI driver to match against |
39ba487f | 246 | * @dev: the PCI device structure to match against |
75865858 GKH |
247 | * |
248 | * Used by a driver to check whether a PCI device present in the | |
249 | * system is in its list of supported devices. Returns the matching | |
250 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 251 | */ |
d73460d7 AB |
252 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
253 | struct pci_dev *dev) | |
75865858 | 254 | { |
75865858 | 255 | struct pci_dynid *dynid; |
782a985d AW |
256 | const struct pci_device_id *found_id = NULL; |
257 | ||
258 | /* When driver_override is set, only bind to the matching driver */ | |
259 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
260 | return NULL; | |
1da177e4 | 261 | |
7461b60a | 262 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
263 | spin_lock(&drv->dynids.lock); |
264 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
265 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
266 | found_id = &dynid->id; |
267 | break; | |
75865858 | 268 | } |
1da177e4 | 269 | } |
75865858 | 270 | spin_unlock(&drv->dynids.lock); |
7461b60a | 271 | |
782a985d AW |
272 | if (!found_id) |
273 | found_id = pci_match_id(drv->id_table, dev); | |
274 | ||
275 | /* driver_override will always match, send a dummy id */ | |
276 | if (!found_id && dev->driver_override) | |
277 | found_id = &pci_device_id_any; | |
278 | ||
279 | return found_id; | |
1da177e4 LT |
280 | } |
281 | ||
873392ca RR |
282 | struct drv_dev_and_id { |
283 | struct pci_driver *drv; | |
284 | struct pci_dev *dev; | |
285 | const struct pci_device_id *id; | |
286 | }; | |
287 | ||
288 | static long local_pci_probe(void *_ddi) | |
289 | { | |
290 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
291 | struct pci_dev *pci_dev = ddi->dev; |
292 | struct pci_driver *pci_drv = ddi->drv; | |
293 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
294 | int rc; |
295 | ||
967577b0 HY |
296 | /* |
297 | * Unbound PCI devices are always put in D0, regardless of | |
298 | * runtime PM status. During probe, the device is set to | |
299 | * active and the usage count is incremented. If the driver | |
a8360062 RW |
300 | * supports runtime PM, it should call pm_runtime_put_noidle(), |
301 | * or any other runtime PM helper function decrementing the usage | |
302 | * count, in its probe routine and pm_runtime_get_noresume() in | |
303 | * its remove routine. | |
f3ec4f87 | 304 | */ |
967577b0 HY |
305 | pm_runtime_get_sync(dev); |
306 | pci_dev->driver = pci_drv; | |
307 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
308 | if (!rc) |
309 | return rc; | |
310 | if (rc < 0) { | |
967577b0 HY |
311 | pci_dev->driver = NULL; |
312 | pm_runtime_put_sync(dev); | |
f92d74c1 | 313 | return rc; |
f3ec4f87 | 314 | } |
f92d74c1 SC |
315 | /* |
316 | * Probe function should return < 0 for failure, 0 for success | |
317 | * Treat values > 0 as success, but warn. | |
318 | */ | |
319 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
320 | return 0; | |
873392ca RR |
321 | } |
322 | ||
d42c6997 AK |
323 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
324 | const struct pci_device_id *id) | |
325 | { | |
873392ca RR |
326 | int error, node; |
327 | struct drv_dev_and_id ddi = { drv, dev, id }; | |
328 | ||
12c3156f AD |
329 | /* |
330 | * Execute driver initialization on node where the device is | |
331 | * attached. This way the driver likely allocates its local memory | |
332 | * on the right node. | |
333 | */ | |
873392ca | 334 | node = dev_to_node(&dev->dev); |
12c3156f AD |
335 | |
336 | /* | |
337 | * On NUMA systems, we are likely to call a PF probe function using | |
338 | * work_on_cpu(). If that probe calls pci_enable_sriov() (which | |
339 | * adds the VF devices via pci_bus_add_device()), we may re-enter | |
340 | * this function to call the VF probe function. Calling | |
341 | * work_on_cpu() again will cause a lockdep warning. Since VFs are | |
342 | * always on the same node as the PF, we can work around this by | |
343 | * avoiding work_on_cpu() when we're already on the correct node. | |
344 | * | |
345 | * Preemption is enabled, so it's theoretically unsafe to use | |
346 | * numa_node_id(), but even if we run the probe function on the | |
347 | * wrong node, it should be functionally correct. | |
348 | */ | |
349 | if (node >= 0 && node != numa_node_id()) { | |
873392ca | 350 | int cpu; |
873392ca RR |
351 | |
352 | get_online_cpus(); | |
a70f7302 | 353 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
873392ca RR |
354 | if (cpu < nr_cpu_ids) |
355 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
356 | else | |
357 | error = local_pci_probe(&ddi); | |
358 | put_online_cpus(); | |
359 | } else | |
360 | error = local_pci_probe(&ddi); | |
12c3156f | 361 | |
d42c6997 AK |
362 | return error; |
363 | } | |
364 | ||
1da177e4 | 365 | /** |
23ea3793 | 366 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
367 | * @drv: driver to call to check if it wants the PCI device |
368 | * @pci_dev: PCI device being probed | |
f7625980 | 369 | * |
8f7020d3 | 370 | * returns 0 on success, else error. |
1da177e4 LT |
371 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
372 | */ | |
3c78bc61 | 373 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
374 | { |
375 | const struct pci_device_id *id; | |
1da177e4 LT |
376 | int error = 0; |
377 | ||
378 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
379 | error = -ENODEV; |
380 | ||
381 | id = pci_match_device(drv, pci_dev); | |
382 | if (id) | |
d42c6997 | 383 | error = pci_call_probe(drv, pci_dev, id); |
967577b0 | 384 | if (error >= 0) |
75865858 | 385 | error = 0; |
1da177e4 LT |
386 | } |
387 | return error; | |
388 | } | |
389 | ||
890e4847 JL |
390 | int __weak pcibios_alloc_irq(struct pci_dev *dev) |
391 | { | |
392 | return 0; | |
393 | } | |
394 | ||
395 | void __weak pcibios_free_irq(struct pci_dev *dev) | |
396 | { | |
397 | } | |
398 | ||
3c78bc61 | 399 | static int pci_device_probe(struct device *dev) |
1da177e4 | 400 | { |
890e4847 JL |
401 | int error; |
402 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
403 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
404 | ||
405 | error = pcibios_alloc_irq(pci_dev); | |
406 | if (error < 0) | |
407 | return error; | |
1da177e4 | 408 | |
1da177e4 LT |
409 | pci_dev_get(pci_dev); |
410 | error = __pci_device_probe(drv, pci_dev); | |
890e4847 JL |
411 | if (error) { |
412 | pcibios_free_irq(pci_dev); | |
1da177e4 | 413 | pci_dev_put(pci_dev); |
890e4847 | 414 | } |
1da177e4 LT |
415 | |
416 | return error; | |
417 | } | |
418 | ||
3c78bc61 | 419 | static int pci_device_remove(struct device *dev) |
1da177e4 | 420 | { |
3c78bc61 RD |
421 | struct pci_dev *pci_dev = to_pci_dev(dev); |
422 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
423 | |
424 | if (drv) { | |
f3ec4f87 AS |
425 | if (drv->remove) { |
426 | pm_runtime_get_sync(dev); | |
1da177e4 | 427 | drv->remove(pci_dev); |
f3ec4f87 AS |
428 | pm_runtime_put_noidle(dev); |
429 | } | |
890e4847 | 430 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
431 | pci_dev->driver = NULL; |
432 | } | |
433 | ||
f3ec4f87 | 434 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 435 | pm_runtime_put_sync(dev); |
f3ec4f87 | 436 | |
2449e06a SL |
437 | /* |
438 | * If the device is still on, set the power state as "unknown", | |
439 | * since it might change by the next time we load the driver. | |
440 | */ | |
441 | if (pci_dev->current_state == PCI_D0) | |
442 | pci_dev->current_state = PCI_UNKNOWN; | |
443 | ||
1da177e4 LT |
444 | /* |
445 | * We would love to complain here if pci_dev->is_enabled is set, that | |
446 | * the driver should have called pci_disable_device(), but the | |
447 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 448 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
449 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
450 | * horrible the crap we have to deal with is when we are awake... | |
451 | */ | |
452 | ||
453 | pci_dev_put(pci_dev); | |
454 | return 0; | |
455 | } | |
456 | ||
bbb44d9f RW |
457 | static void pci_device_shutdown(struct device *dev) |
458 | { | |
459 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
460 | struct pci_driver *drv = pci_dev->driver; | |
461 | ||
3ff2de9b HY |
462 | pm_runtime_resume(dev); |
463 | ||
bbb44d9f RW |
464 | if (drv && drv->shutdown) |
465 | drv->shutdown(pci_dev); | |
466 | pci_msi_shutdown(pci_dev); | |
467 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 468 | |
2965faa5 | 469 | #ifdef CONFIG_KEXEC_CORE |
b566a22c | 470 | /* |
4fc9bbf9 KA |
471 | * If this is a kexec reboot, turn off Bus Master bit on the |
472 | * device to tell it to not continue to do DMA. Don't touch | |
473 | * devices in D3cold or unknown states. | |
474 | * If it is not a kexec reboot, firmware will hit the PCI | |
475 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 476 | */ |
4fc9bbf9 | 477 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 478 | pci_clear_master(pci_dev); |
4fc9bbf9 | 479 | #endif |
bbb44d9f RW |
480 | } |
481 | ||
aa338601 | 482 | #ifdef CONFIG_PM |
6cbf8214 RW |
483 | |
484 | /* Auxiliary functions used for system resume and run-time resume. */ | |
485 | ||
486 | /** | |
487 | * pci_restore_standard_config - restore standard config registers of PCI device | |
488 | * @pci_dev: PCI device to handle | |
489 | */ | |
490 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
491 | { | |
492 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
493 | ||
494 | if (pci_dev->current_state != PCI_D0) { | |
495 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
496 | if (error) | |
497 | return error; | |
498 | } | |
499 | ||
1d3c16a8 JM |
500 | pci_restore_state(pci_dev); |
501 | return 0; | |
6cbf8214 RW |
502 | } |
503 | ||
db288c9c RW |
504 | #endif |
505 | ||
506 | #ifdef CONFIG_PM_SLEEP | |
507 | ||
6cbf8214 RW |
508 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
509 | { | |
db288c9c RW |
510 | pci_power_up(pci_dev); |
511 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
512 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
513 | } | |
514 | ||
fa58d305 RW |
515 | /* |
516 | * Default "suspend" method for devices that have no driver provided suspend, | |
517 | * or not even a driver at all (second part). | |
bbb44d9f | 518 | */ |
bb808945 | 519 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 520 | { |
bbb44d9f RW |
521 | /* |
522 | * mark its power state as "unknown", since we don't know if | |
523 | * e.g. the BIOS will change its device state when we suspend. | |
524 | */ | |
525 | if (pci_dev->current_state == PCI_D0) | |
526 | pci_dev->current_state = PCI_UNKNOWN; | |
527 | } | |
528 | ||
355a72d7 RW |
529 | /* |
530 | * Default "resume" method for devices that have no driver provided resume, | |
531 | * or not even a driver at all (second part). | |
532 | */ | |
bb808945 | 533 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
534 | { |
535 | int retval; | |
536 | ||
bbb44d9f RW |
537 | /* if the device was enabled before suspend, reenable */ |
538 | retval = pci_reenable_device(pci_dev); | |
539 | /* | |
540 | * if the device was busmaster before the suspend, make it busmaster | |
541 | * again | |
542 | */ | |
543 | if (pci_dev->is_busmaster) | |
544 | pci_set_master(pci_dev); | |
545 | ||
546 | return retval; | |
547 | } | |
548 | ||
549 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 550 | { |
3c78bc61 RD |
551 | struct pci_dev *pci_dev = to_pci_dev(dev); |
552 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 553 | |
02669492 | 554 | if (drv && drv->suspend) { |
99dadce8 | 555 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 556 | int error; |
aa8c6c93 | 557 | |
57ef8026 FP |
558 | error = drv->suspend(pci_dev, state); |
559 | suspend_report_result(drv->suspend, error); | |
560 | if (error) | |
561 | return error; | |
aa8c6c93 | 562 | |
46939f8b | 563 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
564 | && pci_dev->current_state != PCI_UNKNOWN) { |
565 | WARN_ONCE(pci_dev->current_state != prev, | |
566 | "PCI PM: Device state not saved by %pF\n", | |
567 | drv->suspend); | |
99dadce8 | 568 | } |
02669492 | 569 | } |
ad8cfa1d RW |
570 | |
571 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
572 | ||
46939f8b | 573 | return 0; |
1da177e4 LT |
574 | } |
575 | ||
bbb44d9f | 576 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 577 | { |
3c78bc61 RD |
578 | struct pci_dev *pci_dev = to_pci_dev(dev); |
579 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
580 | |
581 | if (drv && drv->suspend_late) { | |
46939f8b RW |
582 | pci_power_t prev = pci_dev->current_state; |
583 | int error; | |
584 | ||
57ef8026 FP |
585 | error = drv->suspend_late(pci_dev, state); |
586 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
587 | if (error) |
588 | return error; | |
589 | ||
590 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
591 | && pci_dev->current_state != PCI_UNKNOWN) { | |
592 | WARN_ONCE(pci_dev->current_state != prev, | |
593 | "PCI PM: Device state not saved by %pF\n", | |
594 | drv->suspend_late); | |
7d2a01b8 | 595 | goto Fixup; |
46939f8b | 596 | } |
cbd69dbb | 597 | } |
46939f8b RW |
598 | |
599 | if (!pci_dev->state_saved) | |
600 | pci_save_state(pci_dev); | |
601 | ||
602 | pci_pm_set_unknown_state(pci_dev); | |
603 | ||
7d2a01b8 AN |
604 | Fixup: |
605 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
606 | ||
46939f8b | 607 | return 0; |
cbd69dbb | 608 | } |
1da177e4 | 609 | |
f6dc1e5e RW |
610 | static int pci_legacy_resume_early(struct device *dev) |
611 | { | |
3c78bc61 RD |
612 | struct pci_dev *pci_dev = to_pci_dev(dev); |
613 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 614 | |
aa8c6c93 RW |
615 | return drv && drv->resume_early ? |
616 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
617 | } |
618 | ||
bbb44d9f | 619 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 620 | { |
3c78bc61 RD |
621 | struct pci_dev *pci_dev = to_pci_dev(dev); |
622 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 623 | |
ad8cfa1d RW |
624 | pci_fixup_device(pci_fixup_resume, pci_dev); |
625 | ||
aa8c6c93 RW |
626 | return drv && drv->resume ? |
627 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
628 | } |
629 | ||
571ff758 RW |
630 | /* Auxiliary functions used by the new power management framework */ |
631 | ||
5294e256 | 632 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 633 | { |
73410429 RW |
634 | pci_fixup_device(pci_fixup_resume, pci_dev); |
635 | ||
326c1cda | 636 | if (!pci_has_subordinate(pci_dev)) |
5294e256 | 637 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
638 | } |
639 | ||
5294e256 | 640 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 641 | { |
5294e256 | 642 | /* Disable non-bridge devices without PM support */ |
326c1cda | 643 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 644 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
645 | } |
646 | ||
07e836e8 RW |
647 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
648 | { | |
649 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 650 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 651 | || drv->resume_early); |
bb808945 RW |
652 | |
653 | /* | |
654 | * Legacy PM support is used by default, so warn if the new framework is | |
655 | * supported as well. Drivers are supposed to support either the | |
656 | * former, or the latter, but not both at the same time. | |
657 | */ | |
82440a82 DF |
658 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
659 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
660 | |
661 | return ret; | |
07e836e8 RW |
662 | } |
663 | ||
571ff758 RW |
664 | /* New power management framework */ |
665 | ||
bbb44d9f RW |
666 | static int pci_pm_prepare(struct device *dev) |
667 | { | |
668 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 669 | |
6cbf8214 | 670 | /* |
7cd0602d RW |
671 | * Devices having power.ignore_children set may still be necessary for |
672 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 673 | */ |
7cd0602d RW |
674 | if (dev->power.ignore_children) |
675 | pm_runtime_resume(dev); | |
6cbf8214 | 676 | |
bac2a909 RW |
677 | if (drv && drv->pm && drv->pm->prepare) { |
678 | int error = drv->pm->prepare(dev); | |
679 | if (error) | |
680 | return error; | |
681 | } | |
682 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
683 | } |
684 | ||
2cef548a RW |
685 | static void pci_pm_complete(struct device *dev) |
686 | { | |
c2df86ea | 687 | pci_dev_complete_resume(to_pci_dev(dev)); |
58a1fbbb | 688 | pm_complete_with_resume_check(dev); |
2cef548a | 689 | } |
bbb44d9f | 690 | |
6cbf8214 RW |
691 | #else /* !CONFIG_PM_SLEEP */ |
692 | ||
693 | #define pci_pm_prepare NULL | |
2cef548a | 694 | #define pci_pm_complete NULL |
6cbf8214 RW |
695 | |
696 | #endif /* !CONFIG_PM_SLEEP */ | |
697 | ||
bbb44d9f RW |
698 | #ifdef CONFIG_SUSPEND |
699 | ||
700 | static int pci_pm_suspend(struct device *dev) | |
701 | { | |
702 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 703 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 704 | |
ad8cfa1d RW |
705 | if (pci_has_legacy_pm_support(pci_dev)) |
706 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 707 | |
5294e256 RW |
708 | if (!pm) { |
709 | pci_pm_default_suspend(pci_dev); | |
710 | goto Fixup; | |
711 | } | |
712 | ||
7cd0602d RW |
713 | /* |
714 | * PCI devices suspended at run time need to be resumed at this point, | |
715 | * because in general it is necessary to reconfigure them for system | |
716 | * suspend. Namely, if the device is supposed to wake up the system | |
717 | * from the sleep state, we may need to reconfigure it for this purpose. | |
718 | * In turn, if the device is not supposed to wake up the system from the | |
719 | * sleep state, we'll have to prevent it from signaling wake-up. | |
720 | */ | |
721 | pm_runtime_resume(dev); | |
722 | ||
82fee4d6 | 723 | pci_dev->state_saved = false; |
5294e256 RW |
724 | if (pm->suspend) { |
725 | pci_power_t prev = pci_dev->current_state; | |
726 | int error; | |
727 | ||
ddb7c9d2 RW |
728 | error = pm->suspend(dev); |
729 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
730 | if (error) |
731 | return error; | |
732 | ||
46939f8b | 733 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
734 | && pci_dev->current_state != PCI_UNKNOWN) { |
735 | WARN_ONCE(pci_dev->current_state != prev, | |
736 | "PCI PM: State of device not saved by %pF\n", | |
737 | pm->suspend); | |
5294e256 | 738 | } |
bbb44d9f | 739 | } |
fa58d305 | 740 | |
5294e256 RW |
741 | Fixup: |
742 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
743 | ||
744 | return 0; | |
bbb44d9f RW |
745 | } |
746 | ||
747 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 748 | { |
355a72d7 | 749 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 750 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 751 | |
bb808945 RW |
752 | if (pci_has_legacy_pm_support(pci_dev)) |
753 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
754 | ||
931ff68a RW |
755 | if (!pm) { |
756 | pci_save_state(pci_dev); | |
7d2a01b8 | 757 | goto Fixup; |
931ff68a | 758 | } |
46939f8b RW |
759 | |
760 | if (pm->suspend_noirq) { | |
761 | pci_power_t prev = pci_dev->current_state; | |
762 | int error; | |
763 | ||
764 | error = pm->suspend_noirq(dev); | |
765 | suspend_report_result(pm->suspend_noirq, error); | |
766 | if (error) | |
767 | return error; | |
768 | ||
769 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
770 | && pci_dev->current_state != PCI_UNKNOWN) { | |
771 | WARN_ONCE(pci_dev->current_state != prev, | |
772 | "PCI PM: State of device not saved by %pF\n", | |
773 | pm->suspend_noirq); | |
7d2a01b8 | 774 | goto Fixup; |
46939f8b | 775 | } |
bbb44d9f RW |
776 | } |
777 | ||
46939f8b RW |
778 | if (!pci_dev->state_saved) { |
779 | pci_save_state(pci_dev); | |
326c1cda | 780 | if (!pci_has_subordinate(pci_dev)) |
46939f8b RW |
781 | pci_prepare_to_sleep(pci_dev); |
782 | } | |
d67e37d7 | 783 | |
46939f8b RW |
784 | pci_pm_set_unknown_state(pci_dev); |
785 | ||
dbf0e4c7 AS |
786 | /* |
787 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
788 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
789 | * hasn't been quiesced and tries to turn it off. If the controller | |
790 | * is already in D3, this can hang or cause memory corruption. | |
791 | * | |
792 | * Since the value of the COMMAND register doesn't matter once the | |
793 | * device has been suspended, we can safely set it to 0 here. | |
794 | */ | |
795 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
796 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
797 | ||
7d2a01b8 AN |
798 | Fixup: |
799 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
800 | ||
46939f8b | 801 | return 0; |
c8958177 | 802 | } |
1da177e4 | 803 | |
f6dc1e5e | 804 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
805 | { |
806 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
807 | struct device_driver *drv = dev->driver; | |
355a72d7 | 808 | int error = 0; |
bbb44d9f | 809 | |
6cbf8214 | 810 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 811 | |
ad8cfa1d | 812 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 813 | return pci_legacy_resume_early(dev); |
bb808945 | 814 | |
f6dc1e5e RW |
815 | if (drv && drv->pm && drv->pm->resume_noirq) |
816 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
817 | |
818 | return error; | |
819 | } | |
820 | ||
f6dc1e5e | 821 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 822 | { |
355a72d7 | 823 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 824 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
825 | int error = 0; |
826 | ||
418e4da3 RW |
827 | /* |
828 | * This is necessary for the suspend error path in which resume is | |
829 | * called without restoring the standard config registers of the device. | |
830 | */ | |
831 | if (pci_dev->state_saved) | |
832 | pci_restore_standard_config(pci_dev); | |
833 | ||
ad8cfa1d | 834 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 835 | return pci_legacy_resume(dev); |
bb808945 | 836 | |
5294e256 | 837 | pci_pm_default_resume(pci_dev); |
73410429 | 838 | |
5294e256 RW |
839 | if (pm) { |
840 | if (pm->resume) | |
841 | error = pm->resume(dev); | |
842 | } else { | |
843 | pci_pm_reenable_device(pci_dev); | |
844 | } | |
bbb44d9f | 845 | |
999cce4a | 846 | return error; |
bbb44d9f RW |
847 | } |
848 | ||
849 | #else /* !CONFIG_SUSPEND */ | |
850 | ||
851 | #define pci_pm_suspend NULL | |
852 | #define pci_pm_suspend_noirq NULL | |
853 | #define pci_pm_resume NULL | |
854 | #define pci_pm_resume_noirq NULL | |
855 | ||
856 | #endif /* !CONFIG_SUSPEND */ | |
857 | ||
1f112cee | 858 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 859 | |
699c1985 SO |
860 | |
861 | /* | |
862 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
863 | * a hibernate transition | |
864 | */ | |
865 | struct dev_pm_ops __weak pcibios_pm_ops; | |
866 | ||
bbb44d9f RW |
867 | static int pci_pm_freeze(struct device *dev) |
868 | { | |
869 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 870 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 871 | |
ad8cfa1d RW |
872 | if (pci_has_legacy_pm_support(pci_dev)) |
873 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 874 | |
5294e256 RW |
875 | if (!pm) { |
876 | pci_pm_default_suspend(pci_dev); | |
877 | return 0; | |
bbb44d9f RW |
878 | } |
879 | ||
7cd0602d RW |
880 | /* |
881 | * This used to be done in pci_pm_prepare() for all devices and some | |
882 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
883 | * devices should not be touched during freeze/thaw transitions, | |
884 | * however. | |
885 | */ | |
886 | pm_runtime_resume(dev); | |
887 | ||
82fee4d6 | 888 | pci_dev->state_saved = false; |
5294e256 RW |
889 | if (pm->freeze) { |
890 | int error; | |
891 | ||
892 | error = pm->freeze(dev); | |
893 | suspend_report_result(pm->freeze, error); | |
894 | if (error) | |
895 | return error; | |
896 | } | |
897 | ||
699c1985 SO |
898 | if (pcibios_pm_ops.freeze) |
899 | return pcibios_pm_ops.freeze(dev); | |
900 | ||
5294e256 | 901 | return 0; |
bbb44d9f RW |
902 | } |
903 | ||
904 | static int pci_pm_freeze_noirq(struct device *dev) | |
905 | { | |
355a72d7 | 906 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 907 | struct device_driver *drv = dev->driver; |
bbb44d9f | 908 | |
bb808945 RW |
909 | if (pci_has_legacy_pm_support(pci_dev)) |
910 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
911 | ||
d67e37d7 | 912 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
913 | int error; |
914 | ||
d67e37d7 RW |
915 | error = drv->pm->freeze_noirq(dev); |
916 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
917 | if (error) |
918 | return error; | |
bbb44d9f RW |
919 | } |
920 | ||
46939f8b RW |
921 | if (!pci_dev->state_saved) |
922 | pci_save_state(pci_dev); | |
d67e37d7 | 923 | |
46939f8b RW |
924 | pci_pm_set_unknown_state(pci_dev); |
925 | ||
699c1985 SO |
926 | if (pcibios_pm_ops.freeze_noirq) |
927 | return pcibios_pm_ops.freeze_noirq(dev); | |
928 | ||
46939f8b | 929 | return 0; |
bbb44d9f RW |
930 | } |
931 | ||
f6dc1e5e | 932 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 933 | { |
355a72d7 | 934 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
935 | struct device_driver *drv = dev->driver; |
936 | int error = 0; | |
937 | ||
699c1985 SO |
938 | if (pcibios_pm_ops.thaw_noirq) { |
939 | error = pcibios_pm_ops.thaw_noirq(dev); | |
940 | if (error) | |
941 | return error; | |
942 | } | |
943 | ||
ad8cfa1d | 944 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 945 | return pci_legacy_resume_early(dev); |
bb808945 | 946 | |
f6dc1e5e | 947 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 948 | |
f6dc1e5e RW |
949 | if (drv && drv->pm && drv->pm->thaw_noirq) |
950 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
951 | |
952 | return error; | |
953 | } | |
954 | ||
f6dc1e5e | 955 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 956 | { |
355a72d7 | 957 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 958 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
959 | int error = 0; |
960 | ||
699c1985 SO |
961 | if (pcibios_pm_ops.thaw) { |
962 | error = pcibios_pm_ops.thaw(dev); | |
963 | if (error) | |
964 | return error; | |
965 | } | |
966 | ||
ad8cfa1d | 967 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 968 | return pci_legacy_resume(dev); |
bb808945 | 969 | |
5294e256 RW |
970 | if (pm) { |
971 | if (pm->thaw) | |
972 | error = pm->thaw(dev); | |
973 | } else { | |
974 | pci_pm_reenable_device(pci_dev); | |
975 | } | |
bbb44d9f | 976 | |
4b77b0a2 RW |
977 | pci_dev->state_saved = false; |
978 | ||
bbb44d9f RW |
979 | return error; |
980 | } | |
981 | ||
982 | static int pci_pm_poweroff(struct device *dev) | |
983 | { | |
355a72d7 | 984 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 985 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 986 | |
ad8cfa1d RW |
987 | if (pci_has_legacy_pm_support(pci_dev)) |
988 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 989 | |
5294e256 RW |
990 | if (!pm) { |
991 | pci_pm_default_suspend(pci_dev); | |
992 | goto Fixup; | |
993 | } | |
994 | ||
7cd0602d RW |
995 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
996 | pm_runtime_resume(dev); | |
997 | ||
82fee4d6 | 998 | pci_dev->state_saved = false; |
5294e256 | 999 | if (pm->poweroff) { |
46939f8b RW |
1000 | int error; |
1001 | ||
ddb7c9d2 RW |
1002 | error = pm->poweroff(dev); |
1003 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1004 | if (error) |
1005 | return error; | |
bbb44d9f RW |
1006 | } |
1007 | ||
5294e256 RW |
1008 | Fixup: |
1009 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 1010 | |
699c1985 SO |
1011 | if (pcibios_pm_ops.poweroff) |
1012 | return pcibios_pm_ops.poweroff(dev); | |
1013 | ||
46939f8b | 1014 | return 0; |
bbb44d9f RW |
1015 | } |
1016 | ||
1017 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1018 | { | |
46939f8b | 1019 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1020 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1021 | |
bb808945 RW |
1022 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1023 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1024 | ||
7d2a01b8 AN |
1025 | if (!drv || !drv->pm) { |
1026 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1027 | return 0; |
7d2a01b8 | 1028 | } |
46939f8b RW |
1029 | |
1030 | if (drv->pm->poweroff_noirq) { | |
1031 | int error; | |
1032 | ||
d67e37d7 RW |
1033 | error = drv->pm->poweroff_noirq(dev); |
1034 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1035 | if (error) |
1036 | return error; | |
bbb44d9f RW |
1037 | } |
1038 | ||
326c1cda | 1039 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1040 | pci_prepare_to_sleep(pci_dev); |
1041 | ||
0b68c8e2 RW |
1042 | /* |
1043 | * The reason for doing this here is the same as for the analogous code | |
1044 | * in pci_pm_suspend_noirq(). | |
1045 | */ | |
1046 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1047 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1048 | ||
7d2a01b8 AN |
1049 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1050 | ||
699c1985 SO |
1051 | if (pcibios_pm_ops.poweroff_noirq) |
1052 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1053 | ||
46939f8b | 1054 | return 0; |
bbb44d9f RW |
1055 | } |
1056 | ||
f6dc1e5e | 1057 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1058 | { |
1059 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1060 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1061 | int error = 0; |
bbb44d9f | 1062 | |
699c1985 SO |
1063 | if (pcibios_pm_ops.restore_noirq) { |
1064 | error = pcibios_pm_ops.restore_noirq(dev); | |
1065 | if (error) | |
1066 | return error; | |
1067 | } | |
1068 | ||
6cbf8214 | 1069 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1070 | |
ad8cfa1d | 1071 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1072 | return pci_legacy_resume_early(dev); |
bb808945 | 1073 | |
f6dc1e5e RW |
1074 | if (drv && drv->pm && drv->pm->restore_noirq) |
1075 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1076 | |
1077 | return error; | |
1078 | } | |
1079 | ||
f6dc1e5e | 1080 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1081 | { |
1082 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1083 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1084 | int error = 0; |
1085 | ||
699c1985 SO |
1086 | if (pcibios_pm_ops.restore) { |
1087 | error = pcibios_pm_ops.restore(dev); | |
1088 | if (error) | |
1089 | return error; | |
1090 | } | |
1091 | ||
418e4da3 RW |
1092 | /* |
1093 | * This is necessary for the hibernation error path in which restore is | |
1094 | * called without restoring the standard config registers of the device. | |
1095 | */ | |
1096 | if (pci_dev->state_saved) | |
1097 | pci_restore_standard_config(pci_dev); | |
1098 | ||
ad8cfa1d | 1099 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1100 | return pci_legacy_resume(dev); |
bb808945 | 1101 | |
5294e256 | 1102 | pci_pm_default_resume(pci_dev); |
73410429 | 1103 | |
5294e256 RW |
1104 | if (pm) { |
1105 | if (pm->restore) | |
1106 | error = pm->restore(dev); | |
1107 | } else { | |
1108 | pci_pm_reenable_device(pci_dev); | |
1109 | } | |
bbb44d9f RW |
1110 | |
1111 | return error; | |
c8958177 | 1112 | } |
1da177e4 | 1113 | |
1f112cee | 1114 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1115 | |
1116 | #define pci_pm_freeze NULL | |
1117 | #define pci_pm_freeze_noirq NULL | |
1118 | #define pci_pm_thaw NULL | |
1119 | #define pci_pm_thaw_noirq NULL | |
1120 | #define pci_pm_poweroff NULL | |
1121 | #define pci_pm_poweroff_noirq NULL | |
1122 | #define pci_pm_restore NULL | |
1123 | #define pci_pm_restore_noirq NULL | |
1124 | ||
1f112cee | 1125 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1126 | |
fbb988be | 1127 | #ifdef CONFIG_PM |
6cbf8214 RW |
1128 | |
1129 | static int pci_pm_runtime_suspend(struct device *dev) | |
1130 | { | |
1131 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1132 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1133 | pci_power_t prev = pci_dev->current_state; | |
1134 | int error; | |
1135 | ||
967577b0 HY |
1136 | /* |
1137 | * If pci_dev->driver is not set (unbound), the device should | |
1138 | * always remain in D0 regardless of the runtime PM status | |
1139 | */ | |
1140 | if (!pci_dev->driver) | |
1141 | return 0; | |
1142 | ||
6cbf8214 RW |
1143 | if (!pm || !pm->runtime_suspend) |
1144 | return -ENOSYS; | |
1145 | ||
82fee4d6 | 1146 | pci_dev->state_saved = false; |
448bd857 | 1147 | pci_dev->no_d3cold = false; |
6cbf8214 | 1148 | error = pm->runtime_suspend(dev); |
06bf403d ID |
1149 | if (error) { |
1150 | /* | |
1151 | * -EBUSY and -EAGAIN is used to request the runtime PM core | |
1152 | * to schedule a new suspend, so log the event only with debug | |
1153 | * log level. | |
1154 | */ | |
1155 | if (error == -EBUSY || error == -EAGAIN) | |
1156 | dev_dbg(dev, "can't suspend now (%pf returned %d)\n", | |
1157 | pm->runtime_suspend, error); | |
1158 | else | |
1159 | dev_err(dev, "can't suspend (%pf returned %d)\n", | |
1160 | pm->runtime_suspend, error); | |
1161 | ||
6cbf8214 | 1162 | return error; |
06bf403d | 1163 | } |
448bd857 HY |
1164 | if (!pci_dev->d3cold_allowed) |
1165 | pci_dev->no_d3cold = true; | |
6cbf8214 RW |
1166 | |
1167 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1168 | ||
1169 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1170 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1171 | WARN_ONCE(pci_dev->current_state != prev, | |
1172 | "PCI PM: State of device not saved by %pF\n", | |
1173 | pm->runtime_suspend); | |
1174 | return 0; | |
1175 | } | |
1176 | ||
42eca230 | 1177 | if (!pci_dev->state_saved) { |
6cbf8214 | 1178 | pci_save_state(pci_dev); |
42eca230 DA |
1179 | pci_finish_runtime_suspend(pci_dev); |
1180 | } | |
6cbf8214 RW |
1181 | |
1182 | return 0; | |
1183 | } | |
1184 | ||
1185 | static int pci_pm_runtime_resume(struct device *dev) | |
1186 | { | |
448bd857 | 1187 | int rc; |
6cbf8214 RW |
1188 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1189 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1190 | ||
967577b0 HY |
1191 | /* |
1192 | * If pci_dev->driver is not set (unbound), the device should | |
1193 | * always remain in D0 regardless of the runtime PM status | |
1194 | */ | |
1195 | if (!pci_dev->driver) | |
1196 | return 0; | |
1197 | ||
6cbf8214 RW |
1198 | if (!pm || !pm->runtime_resume) |
1199 | return -ENOSYS; | |
1200 | ||
db288c9c RW |
1201 | pci_restore_standard_config(pci_dev); |
1202 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1203 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1204 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1205 | ||
448bd857 HY |
1206 | rc = pm->runtime_resume(dev); |
1207 | ||
1208 | pci_dev->runtime_d3cold = false; | |
1209 | ||
1210 | return rc; | |
6cbf8214 RW |
1211 | } |
1212 | ||
1213 | static int pci_pm_runtime_idle(struct device *dev) | |
1214 | { | |
967577b0 | 1215 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1216 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1217 | int ret = 0; |
6cbf8214 | 1218 | |
967577b0 HY |
1219 | /* |
1220 | * If pci_dev->driver is not set (unbound), the device should | |
1221 | * always remain in D0 regardless of the runtime PM status | |
1222 | */ | |
1223 | if (!pci_dev->driver) | |
45f0a85c | 1224 | return 0; |
967577b0 | 1225 | |
6cbf8214 RW |
1226 | if (!pm) |
1227 | return -ENOSYS; | |
1228 | ||
45f0a85c RW |
1229 | if (pm->runtime_idle) |
1230 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1231 | |
45f0a85c | 1232 | return ret; |
6cbf8214 RW |
1233 | } |
1234 | ||
f91da04d | 1235 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1236 | .prepare = pci_pm_prepare, |
2cef548a | 1237 | .complete = pci_pm_complete, |
adf09493 RW |
1238 | .suspend = pci_pm_suspend, |
1239 | .resume = pci_pm_resume, | |
1240 | .freeze = pci_pm_freeze, | |
1241 | .thaw = pci_pm_thaw, | |
1242 | .poweroff = pci_pm_poweroff, | |
1243 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1244 | .suspend_noirq = pci_pm_suspend_noirq, |
1245 | .resume_noirq = pci_pm_resume_noirq, | |
1246 | .freeze_noirq = pci_pm_freeze_noirq, | |
1247 | .thaw_noirq = pci_pm_thaw_noirq, | |
1248 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1249 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1250 | .runtime_suspend = pci_pm_runtime_suspend, |
1251 | .runtime_resume = pci_pm_runtime_resume, | |
1252 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1253 | }; |
1254 | ||
adf09493 | 1255 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1256 | |
fbb988be RW |
1257 | #else /* !CONFIG_PM */ |
1258 | ||
1259 | #define pci_pm_runtime_suspend NULL | |
1260 | #define pci_pm_runtime_resume NULL | |
1261 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1262 | |
1263 | #define PCI_PM_OPS_PTR NULL | |
1264 | ||
fbb988be | 1265 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1266 | |
1da177e4 | 1267 | /** |
863b18f4 | 1268 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1269 | * @drv: the driver structure to register |
863b18f4 | 1270 | * @owner: owner module of drv |
f95d882d | 1271 | * @mod_name: module name string |
f7625980 | 1272 | * |
1da177e4 | 1273 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1274 | * Returns a negative value on error, otherwise 0. |
1275 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1276 | * no device was claimed during registration. |
1277 | */ | |
725522b5 GKH |
1278 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1279 | const char *mod_name) | |
1da177e4 | 1280 | { |
1da177e4 LT |
1281 | /* initialize common driver fields */ |
1282 | drv->driver.name = drv->name; | |
1283 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1284 | drv->driver.owner = owner; |
725522b5 | 1285 | drv->driver.mod_name = mod_name; |
50b00755 | 1286 | |
75865858 GKH |
1287 | spin_lock_init(&drv->dynids.lock); |
1288 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1289 | |
1290 | /* register with core */ | |
bfb09a86 | 1291 | return driver_register(&drv->driver); |
1da177e4 | 1292 | } |
b7fe9434 | 1293 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1294 | |
1295 | /** | |
1296 | * pci_unregister_driver - unregister a pci driver | |
1297 | * @drv: the driver structure to unregister | |
f7625980 | 1298 | * |
1da177e4 LT |
1299 | * Deletes the driver structure from the list of registered PCI drivers, |
1300 | * gives it a chance to clean up by calling its remove() function for | |
1301 | * each device it was responsible for, and marks those devices as | |
1302 | * driverless. | |
1303 | */ | |
1304 | ||
3c78bc61 | 1305 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1306 | { |
1307 | driver_unregister(&drv->driver); | |
1308 | pci_free_dynids(drv); | |
1309 | } | |
b7fe9434 | 1310 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1311 | |
1312 | static struct pci_driver pci_compat_driver = { | |
1313 | .name = "compat" | |
1314 | }; | |
1315 | ||
1316 | /** | |
1317 | * pci_dev_driver - get the pci_driver of a device | |
1318 | * @dev: the device to query | |
1319 | * | |
f7625980 | 1320 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1321 | * registered driver for the device. |
1322 | */ | |
3c78bc61 | 1323 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1324 | { |
1325 | if (dev->driver) | |
1326 | return dev->driver; | |
1327 | else { | |
1328 | int i; | |
3c78bc61 | 1329 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1330 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1331 | return &pci_compat_driver; | |
1332 | } | |
1333 | return NULL; | |
1334 | } | |
b7fe9434 | 1335 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1336 | |
1337 | /** | |
1338 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1339 | * @dev: the PCI device structure to match against |
8f7020d3 | 1340 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1341 | * |
1da177e4 | 1342 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1343 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1344 | * pci_device_id structure or %NULL if there is no match. |
1345 | */ | |
75865858 | 1346 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1347 | { |
75865858 | 1348 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1349 | struct pci_driver *pci_drv; |
1da177e4 LT |
1350 | const struct pci_device_id *found_id; |
1351 | ||
58d9a38f YL |
1352 | if (!pci_dev->match_driver) |
1353 | return 0; | |
1354 | ||
1355 | pci_drv = to_pci_driver(drv); | |
75865858 | 1356 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1357 | if (found_id) |
1358 | return 1; | |
1359 | ||
75865858 | 1360 | return 0; |
1da177e4 LT |
1361 | } |
1362 | ||
1363 | /** | |
1364 | * pci_dev_get - increments the reference count of the pci device structure | |
1365 | * @dev: the device being referenced | |
1366 | * | |
1367 | * Each live reference to a device should be refcounted. | |
1368 | * | |
1369 | * Drivers for PCI devices should normally record such references in | |
1370 | * their probe() methods, when they bind to a device, and release | |
1371 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1372 | * | |
1373 | * A pointer to the device with the incremented reference counter is returned. | |
1374 | */ | |
1375 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1376 | { | |
1377 | if (dev) | |
1378 | get_device(&dev->dev); | |
1379 | return dev; | |
1380 | } | |
b7fe9434 | 1381 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1382 | |
1383 | /** | |
1384 | * pci_dev_put - release a use of the pci device structure | |
1385 | * @dev: device that's been disconnected | |
1386 | * | |
1387 | * Must be called when a user of a device is finished with it. When the last | |
1388 | * user of the device calls this function, the memory of the device is freed. | |
1389 | */ | |
1390 | void pci_dev_put(struct pci_dev *dev) | |
1391 | { | |
1392 | if (dev) | |
1393 | put_device(&dev->dev); | |
1394 | } | |
b7fe9434 | 1395 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1396 | |
8ccc9aa1 BP |
1397 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1398 | { | |
1399 | struct pci_dev *pdev; | |
1400 | ||
1401 | if (!dev) | |
1402 | return -ENODEV; | |
1403 | ||
1404 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1405 | |
1406 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1407 | return -ENOMEM; | |
1408 | ||
1409 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1410 | return -ENOMEM; | |
1411 | ||
1412 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1413 | pdev->subsystem_device)) | |
1414 | return -ENOMEM; | |
1415 | ||
1416 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1417 | return -ENOMEM; | |
1418 | ||
145b3fe5 | 1419 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1420 | pdev->vendor, pdev->device, |
1421 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1422 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1423 | (u8)(pdev->class))) | |
1424 | return -ENOMEM; | |
efdd4070 | 1425 | |
8ccc9aa1 BP |
1426 | return 0; |
1427 | } | |
1428 | ||
1da177e4 LT |
1429 | struct bus_type pci_bus_type = { |
1430 | .name = "pci", | |
1431 | .match = pci_bus_match, | |
312c004d | 1432 | .uevent = pci_uevent, |
b15d686a RK |
1433 | .probe = pci_device_probe, |
1434 | .remove = pci_device_remove, | |
cbd69dbb | 1435 | .shutdown = pci_device_shutdown, |
5136b2da | 1436 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1437 | .bus_groups = pci_bus_groups, |
2229c1fb | 1438 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1439 | .pm = PCI_PM_OPS_PTR, |
1da177e4 | 1440 | }; |
b7fe9434 | 1441 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1442 | |
1443 | static int __init pci_driver_init(void) | |
1444 | { | |
1445 | return bus_register(&pci_bus_type); | |
1446 | } | |
1da177e4 | 1447 | postcore_initcall(pci_driver_init); |