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); |
1da177e4 LT |
384 | } |
385 | return error; | |
386 | } | |
387 | ||
890e4847 JL |
388 | int __weak pcibios_alloc_irq(struct pci_dev *dev) |
389 | { | |
390 | return 0; | |
391 | } | |
392 | ||
393 | void __weak pcibios_free_irq(struct pci_dev *dev) | |
394 | { | |
395 | } | |
396 | ||
3c78bc61 | 397 | static int pci_device_probe(struct device *dev) |
1da177e4 | 398 | { |
890e4847 JL |
399 | int error; |
400 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
401 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
402 | ||
403 | error = pcibios_alloc_irq(pci_dev); | |
404 | if (error < 0) | |
405 | return error; | |
1da177e4 | 406 | |
1da177e4 LT |
407 | pci_dev_get(pci_dev); |
408 | error = __pci_device_probe(drv, pci_dev); | |
890e4847 JL |
409 | if (error) { |
410 | pcibios_free_irq(pci_dev); | |
1da177e4 | 411 | pci_dev_put(pci_dev); |
890e4847 | 412 | } |
1da177e4 LT |
413 | |
414 | return error; | |
415 | } | |
416 | ||
3c78bc61 | 417 | static int pci_device_remove(struct device *dev) |
1da177e4 | 418 | { |
3c78bc61 RD |
419 | struct pci_dev *pci_dev = to_pci_dev(dev); |
420 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
421 | |
422 | if (drv) { | |
f3ec4f87 AS |
423 | if (drv->remove) { |
424 | pm_runtime_get_sync(dev); | |
1da177e4 | 425 | drv->remove(pci_dev); |
f3ec4f87 AS |
426 | pm_runtime_put_noidle(dev); |
427 | } | |
890e4847 | 428 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
429 | pci_dev->driver = NULL; |
430 | } | |
431 | ||
f3ec4f87 | 432 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 433 | pm_runtime_put_sync(dev); |
f3ec4f87 | 434 | |
2449e06a SL |
435 | /* |
436 | * If the device is still on, set the power state as "unknown", | |
437 | * since it might change by the next time we load the driver. | |
438 | */ | |
439 | if (pci_dev->current_state == PCI_D0) | |
440 | pci_dev->current_state = PCI_UNKNOWN; | |
441 | ||
1da177e4 LT |
442 | /* |
443 | * We would love to complain here if pci_dev->is_enabled is set, that | |
444 | * the driver should have called pci_disable_device(), but the | |
445 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 446 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
447 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
448 | * horrible the crap we have to deal with is when we are awake... | |
449 | */ | |
450 | ||
451 | pci_dev_put(pci_dev); | |
452 | return 0; | |
453 | } | |
454 | ||
bbb44d9f RW |
455 | static void pci_device_shutdown(struct device *dev) |
456 | { | |
457 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
458 | struct pci_driver *drv = pci_dev->driver; | |
459 | ||
3ff2de9b HY |
460 | pm_runtime_resume(dev); |
461 | ||
bbb44d9f RW |
462 | if (drv && drv->shutdown) |
463 | drv->shutdown(pci_dev); | |
464 | pci_msi_shutdown(pci_dev); | |
465 | pci_msix_shutdown(pci_dev); | |
5b415f1e | 466 | |
b566a22c | 467 | /* |
4fc9bbf9 KA |
468 | * If this is a kexec reboot, turn off Bus Master bit on the |
469 | * device to tell it to not continue to do DMA. Don't touch | |
470 | * devices in D3cold or unknown states. | |
471 | * If it is not a kexec reboot, firmware will hit the PCI | |
472 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 473 | */ |
4fc9bbf9 | 474 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 475 | pci_clear_master(pci_dev); |
bbb44d9f RW |
476 | } |
477 | ||
aa338601 | 478 | #ifdef CONFIG_PM |
6cbf8214 RW |
479 | |
480 | /* Auxiliary functions used for system resume and run-time resume. */ | |
481 | ||
482 | /** | |
483 | * pci_restore_standard_config - restore standard config registers of PCI device | |
484 | * @pci_dev: PCI device to handle | |
485 | */ | |
486 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
487 | { | |
488 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
489 | ||
490 | if (pci_dev->current_state != PCI_D0) { | |
491 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
492 | if (error) | |
493 | return error; | |
494 | } | |
495 | ||
1d3c16a8 JM |
496 | pci_restore_state(pci_dev); |
497 | return 0; | |
6cbf8214 RW |
498 | } |
499 | ||
db288c9c RW |
500 | #endif |
501 | ||
502 | #ifdef CONFIG_PM_SLEEP | |
503 | ||
6cbf8214 RW |
504 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
505 | { | |
db288c9c RW |
506 | pci_power_up(pci_dev); |
507 | pci_restore_state(pci_dev); | |
6cbf8214 RW |
508 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
509 | } | |
510 | ||
fa58d305 RW |
511 | /* |
512 | * Default "suspend" method for devices that have no driver provided suspend, | |
513 | * or not even a driver at all (second part). | |
bbb44d9f | 514 | */ |
bb808945 | 515 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 516 | { |
bbb44d9f RW |
517 | /* |
518 | * mark its power state as "unknown", since we don't know if | |
519 | * e.g. the BIOS will change its device state when we suspend. | |
520 | */ | |
521 | if (pci_dev->current_state == PCI_D0) | |
522 | pci_dev->current_state = PCI_UNKNOWN; | |
523 | } | |
524 | ||
355a72d7 RW |
525 | /* |
526 | * Default "resume" method for devices that have no driver provided resume, | |
527 | * or not even a driver at all (second part). | |
528 | */ | |
bb808945 | 529 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
530 | { |
531 | int retval; | |
532 | ||
bbb44d9f RW |
533 | /* if the device was enabled before suspend, reenable */ |
534 | retval = pci_reenable_device(pci_dev); | |
535 | /* | |
536 | * if the device was busmaster before the suspend, make it busmaster | |
537 | * again | |
538 | */ | |
539 | if (pci_dev->is_busmaster) | |
540 | pci_set_master(pci_dev); | |
541 | ||
542 | return retval; | |
543 | } | |
544 | ||
545 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 546 | { |
3c78bc61 RD |
547 | struct pci_dev *pci_dev = to_pci_dev(dev); |
548 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 549 | |
02669492 | 550 | if (drv && drv->suspend) { |
99dadce8 | 551 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 552 | int error; |
aa8c6c93 | 553 | |
57ef8026 FP |
554 | error = drv->suspend(pci_dev, state); |
555 | suspend_report_result(drv->suspend, error); | |
556 | if (error) | |
557 | return error; | |
aa8c6c93 | 558 | |
46939f8b | 559 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
560 | && pci_dev->current_state != PCI_UNKNOWN) { |
561 | WARN_ONCE(pci_dev->current_state != prev, | |
562 | "PCI PM: Device state not saved by %pF\n", | |
563 | drv->suspend); | |
99dadce8 | 564 | } |
02669492 | 565 | } |
ad8cfa1d RW |
566 | |
567 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
568 | ||
46939f8b | 569 | return 0; |
1da177e4 LT |
570 | } |
571 | ||
bbb44d9f | 572 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 573 | { |
3c78bc61 RD |
574 | struct pci_dev *pci_dev = to_pci_dev(dev); |
575 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
576 | |
577 | if (drv && drv->suspend_late) { | |
46939f8b RW |
578 | pci_power_t prev = pci_dev->current_state; |
579 | int error; | |
580 | ||
57ef8026 FP |
581 | error = drv->suspend_late(pci_dev, state); |
582 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
583 | if (error) |
584 | return error; | |
585 | ||
586 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
587 | && pci_dev->current_state != PCI_UNKNOWN) { | |
588 | WARN_ONCE(pci_dev->current_state != prev, | |
589 | "PCI PM: Device state not saved by %pF\n", | |
590 | drv->suspend_late); | |
7d2a01b8 | 591 | goto Fixup; |
46939f8b | 592 | } |
cbd69dbb | 593 | } |
46939f8b RW |
594 | |
595 | if (!pci_dev->state_saved) | |
596 | pci_save_state(pci_dev); | |
597 | ||
598 | pci_pm_set_unknown_state(pci_dev); | |
599 | ||
7d2a01b8 AN |
600 | Fixup: |
601 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
602 | ||
46939f8b | 603 | return 0; |
cbd69dbb | 604 | } |
1da177e4 | 605 | |
f6dc1e5e RW |
606 | static int pci_legacy_resume_early(struct device *dev) |
607 | { | |
3c78bc61 RD |
608 | struct pci_dev *pci_dev = to_pci_dev(dev); |
609 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 610 | |
aa8c6c93 RW |
611 | return drv && drv->resume_early ? |
612 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
613 | } |
614 | ||
bbb44d9f | 615 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 616 | { |
3c78bc61 RD |
617 | struct pci_dev *pci_dev = to_pci_dev(dev); |
618 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 619 | |
ad8cfa1d RW |
620 | pci_fixup_device(pci_fixup_resume, pci_dev); |
621 | ||
aa8c6c93 RW |
622 | return drv && drv->resume ? |
623 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
624 | } |
625 | ||
571ff758 RW |
626 | /* Auxiliary functions used by the new power management framework */ |
627 | ||
5294e256 | 628 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 629 | { |
73410429 RW |
630 | pci_fixup_device(pci_fixup_resume, pci_dev); |
631 | ||
326c1cda | 632 | if (!pci_has_subordinate(pci_dev)) |
5294e256 | 633 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
634 | } |
635 | ||
5294e256 | 636 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 637 | { |
5294e256 | 638 | /* Disable non-bridge devices without PM support */ |
326c1cda | 639 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 640 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
641 | } |
642 | ||
07e836e8 RW |
643 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
644 | { | |
645 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 646 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 647 | || drv->resume_early); |
bb808945 RW |
648 | |
649 | /* | |
650 | * Legacy PM support is used by default, so warn if the new framework is | |
651 | * supported as well. Drivers are supposed to support either the | |
652 | * former, or the latter, but not both at the same time. | |
653 | */ | |
82440a82 DF |
654 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
655 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
656 | |
657 | return ret; | |
07e836e8 RW |
658 | } |
659 | ||
571ff758 RW |
660 | /* New power management framework */ |
661 | ||
bbb44d9f RW |
662 | static int pci_pm_prepare(struct device *dev) |
663 | { | |
664 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 665 | |
6cbf8214 | 666 | /* |
7cd0602d RW |
667 | * Devices having power.ignore_children set may still be necessary for |
668 | * suspending their children in the next phase of device suspend. | |
6cbf8214 | 669 | */ |
7cd0602d RW |
670 | if (dev->power.ignore_children) |
671 | pm_runtime_resume(dev); | |
6cbf8214 | 672 | |
bac2a909 RW |
673 | if (drv && drv->pm && drv->pm->prepare) { |
674 | int error = drv->pm->prepare(dev); | |
675 | if (error) | |
676 | return error; | |
677 | } | |
678 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
679 | } |
680 | ||
2cef548a RW |
681 | static void pci_pm_complete(struct device *dev) |
682 | { | |
a0d2a959 LW |
683 | struct pci_dev *pci_dev = to_pci_dev(dev); |
684 | ||
685 | pci_dev_complete_resume(pci_dev); | |
686 | pm_generic_complete(dev); | |
687 | ||
688 | /* Resume device if platform firmware has put it in reset-power-on */ | |
689 | if (dev->power.direct_complete && pm_resume_via_firmware()) { | |
690 | pci_power_t pre_sleep_state = pci_dev->current_state; | |
691 | ||
692 | pci_update_current_state(pci_dev, pci_dev->current_state); | |
693 | if (pci_dev->current_state < pre_sleep_state) | |
694 | pm_request_resume(dev); | |
695 | } | |
2cef548a | 696 | } |
bbb44d9f | 697 | |
6cbf8214 RW |
698 | #else /* !CONFIG_PM_SLEEP */ |
699 | ||
700 | #define pci_pm_prepare NULL | |
2cef548a | 701 | #define pci_pm_complete NULL |
6cbf8214 RW |
702 | |
703 | #endif /* !CONFIG_PM_SLEEP */ | |
704 | ||
bbb44d9f RW |
705 | #ifdef CONFIG_SUSPEND |
706 | ||
707 | static int pci_pm_suspend(struct device *dev) | |
708 | { | |
709 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 710 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 711 | |
ad8cfa1d RW |
712 | if (pci_has_legacy_pm_support(pci_dev)) |
713 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 714 | |
5294e256 RW |
715 | if (!pm) { |
716 | pci_pm_default_suspend(pci_dev); | |
717 | goto Fixup; | |
718 | } | |
719 | ||
7cd0602d RW |
720 | /* |
721 | * PCI devices suspended at run time need to be resumed at this point, | |
722 | * because in general it is necessary to reconfigure them for system | |
723 | * suspend. Namely, if the device is supposed to wake up the system | |
724 | * from the sleep state, we may need to reconfigure it for this purpose. | |
725 | * In turn, if the device is not supposed to wake up the system from the | |
726 | * sleep state, we'll have to prevent it from signaling wake-up. | |
727 | */ | |
728 | pm_runtime_resume(dev); | |
729 | ||
82fee4d6 | 730 | pci_dev->state_saved = false; |
5294e256 RW |
731 | if (pm->suspend) { |
732 | pci_power_t prev = pci_dev->current_state; | |
733 | int error; | |
734 | ||
ddb7c9d2 RW |
735 | error = pm->suspend(dev); |
736 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
737 | if (error) |
738 | return error; | |
739 | ||
46939f8b | 740 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
741 | && pci_dev->current_state != PCI_UNKNOWN) { |
742 | WARN_ONCE(pci_dev->current_state != prev, | |
743 | "PCI PM: State of device not saved by %pF\n", | |
744 | pm->suspend); | |
5294e256 | 745 | } |
bbb44d9f | 746 | } |
fa58d305 | 747 | |
5294e256 RW |
748 | Fixup: |
749 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
750 | ||
751 | return 0; | |
bbb44d9f RW |
752 | } |
753 | ||
754 | static int pci_pm_suspend_noirq(struct device *dev) | |
c8958177 | 755 | { |
355a72d7 | 756 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 757 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 758 | |
bb808945 RW |
759 | if (pci_has_legacy_pm_support(pci_dev)) |
760 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
761 | ||
931ff68a RW |
762 | if (!pm) { |
763 | pci_save_state(pci_dev); | |
7d2a01b8 | 764 | goto Fixup; |
931ff68a | 765 | } |
46939f8b RW |
766 | |
767 | if (pm->suspend_noirq) { | |
768 | pci_power_t prev = pci_dev->current_state; | |
769 | int error; | |
770 | ||
771 | error = pm->suspend_noirq(dev); | |
772 | suspend_report_result(pm->suspend_noirq, error); | |
773 | if (error) | |
774 | return error; | |
775 | ||
776 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
777 | && pci_dev->current_state != PCI_UNKNOWN) { | |
778 | WARN_ONCE(pci_dev->current_state != prev, | |
779 | "PCI PM: State of device not saved by %pF\n", | |
780 | pm->suspend_noirq); | |
7d2a01b8 | 781 | goto Fixup; |
46939f8b | 782 | } |
bbb44d9f RW |
783 | } |
784 | ||
46939f8b RW |
785 | if (!pci_dev->state_saved) { |
786 | pci_save_state(pci_dev); | |
9d26d3a8 | 787 | if (pci_power_manageable(pci_dev)) |
46939f8b RW |
788 | pci_prepare_to_sleep(pci_dev); |
789 | } | |
d67e37d7 | 790 | |
46939f8b RW |
791 | pci_pm_set_unknown_state(pci_dev); |
792 | ||
dbf0e4c7 AS |
793 | /* |
794 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
795 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
796 | * hasn't been quiesced and tries to turn it off. If the controller | |
797 | * is already in D3, this can hang or cause memory corruption. | |
798 | * | |
799 | * Since the value of the COMMAND register doesn't matter once the | |
800 | * device has been suspended, we can safely set it to 0 here. | |
801 | */ | |
802 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
803 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
804 | ||
7d2a01b8 AN |
805 | Fixup: |
806 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
807 | ||
46939f8b | 808 | return 0; |
c8958177 | 809 | } |
1da177e4 | 810 | |
f6dc1e5e | 811 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
812 | { |
813 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
814 | struct device_driver *drv = dev->driver; | |
355a72d7 | 815 | int error = 0; |
bbb44d9f | 816 | |
6cbf8214 | 817 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 818 | |
ad8cfa1d | 819 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 820 | return pci_legacy_resume_early(dev); |
bb808945 | 821 | |
f6dc1e5e RW |
822 | if (drv && drv->pm && drv->pm->resume_noirq) |
823 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
824 | |
825 | return error; | |
826 | } | |
827 | ||
f6dc1e5e | 828 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 829 | { |
355a72d7 | 830 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 831 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
832 | int error = 0; |
833 | ||
418e4da3 RW |
834 | /* |
835 | * This is necessary for the suspend error path in which resume is | |
836 | * called without restoring the standard config registers of the device. | |
837 | */ | |
838 | if (pci_dev->state_saved) | |
839 | pci_restore_standard_config(pci_dev); | |
840 | ||
ad8cfa1d | 841 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 842 | return pci_legacy_resume(dev); |
bb808945 | 843 | |
5294e256 | 844 | pci_pm_default_resume(pci_dev); |
73410429 | 845 | |
5294e256 RW |
846 | if (pm) { |
847 | if (pm->resume) | |
848 | error = pm->resume(dev); | |
849 | } else { | |
850 | pci_pm_reenable_device(pci_dev); | |
851 | } | |
bbb44d9f | 852 | |
999cce4a | 853 | return error; |
bbb44d9f RW |
854 | } |
855 | ||
856 | #else /* !CONFIG_SUSPEND */ | |
857 | ||
858 | #define pci_pm_suspend NULL | |
859 | #define pci_pm_suspend_noirq NULL | |
860 | #define pci_pm_resume NULL | |
861 | #define pci_pm_resume_noirq NULL | |
862 | ||
863 | #endif /* !CONFIG_SUSPEND */ | |
864 | ||
1f112cee | 865 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 866 | |
699c1985 SO |
867 | |
868 | /* | |
869 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
870 | * a hibernate transition | |
871 | */ | |
872 | struct dev_pm_ops __weak pcibios_pm_ops; | |
873 | ||
bbb44d9f RW |
874 | static int pci_pm_freeze(struct device *dev) |
875 | { | |
876 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 877 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 878 | |
ad8cfa1d RW |
879 | if (pci_has_legacy_pm_support(pci_dev)) |
880 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 881 | |
5294e256 RW |
882 | if (!pm) { |
883 | pci_pm_default_suspend(pci_dev); | |
884 | return 0; | |
bbb44d9f RW |
885 | } |
886 | ||
7cd0602d RW |
887 | /* |
888 | * This used to be done in pci_pm_prepare() for all devices and some | |
889 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
890 | * devices should not be touched during freeze/thaw transitions, | |
891 | * however. | |
892 | */ | |
893 | pm_runtime_resume(dev); | |
894 | ||
82fee4d6 | 895 | pci_dev->state_saved = false; |
5294e256 RW |
896 | if (pm->freeze) { |
897 | int error; | |
898 | ||
899 | error = pm->freeze(dev); | |
900 | suspend_report_result(pm->freeze, error); | |
901 | if (error) | |
902 | return error; | |
903 | } | |
904 | ||
699c1985 SO |
905 | if (pcibios_pm_ops.freeze) |
906 | return pcibios_pm_ops.freeze(dev); | |
907 | ||
5294e256 | 908 | return 0; |
bbb44d9f RW |
909 | } |
910 | ||
911 | static int pci_pm_freeze_noirq(struct device *dev) | |
912 | { | |
355a72d7 | 913 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 914 | struct device_driver *drv = dev->driver; |
bbb44d9f | 915 | |
bb808945 RW |
916 | if (pci_has_legacy_pm_support(pci_dev)) |
917 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
918 | ||
d67e37d7 | 919 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
920 | int error; |
921 | ||
d67e37d7 RW |
922 | error = drv->pm->freeze_noirq(dev); |
923 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
924 | if (error) |
925 | return error; | |
bbb44d9f RW |
926 | } |
927 | ||
46939f8b RW |
928 | if (!pci_dev->state_saved) |
929 | pci_save_state(pci_dev); | |
d67e37d7 | 930 | |
46939f8b RW |
931 | pci_pm_set_unknown_state(pci_dev); |
932 | ||
699c1985 SO |
933 | if (pcibios_pm_ops.freeze_noirq) |
934 | return pcibios_pm_ops.freeze_noirq(dev); | |
935 | ||
46939f8b | 936 | return 0; |
bbb44d9f RW |
937 | } |
938 | ||
f6dc1e5e | 939 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 940 | { |
355a72d7 | 941 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
942 | struct device_driver *drv = dev->driver; |
943 | int error = 0; | |
944 | ||
699c1985 SO |
945 | if (pcibios_pm_ops.thaw_noirq) { |
946 | error = pcibios_pm_ops.thaw_noirq(dev); | |
947 | if (error) | |
948 | return error; | |
949 | } | |
950 | ||
ad8cfa1d | 951 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 952 | return pci_legacy_resume_early(dev); |
bb808945 | 953 | |
f6dc1e5e | 954 | pci_update_current_state(pci_dev, PCI_D0); |
d67e37d7 | 955 | |
f6dc1e5e RW |
956 | if (drv && drv->pm && drv->pm->thaw_noirq) |
957 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
958 | |
959 | return error; | |
960 | } | |
961 | ||
f6dc1e5e | 962 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 963 | { |
355a72d7 | 964 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 965 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
966 | int error = 0; |
967 | ||
699c1985 SO |
968 | if (pcibios_pm_ops.thaw) { |
969 | error = pcibios_pm_ops.thaw(dev); | |
970 | if (error) | |
971 | return error; | |
972 | } | |
973 | ||
ad8cfa1d | 974 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 975 | return pci_legacy_resume(dev); |
bb808945 | 976 | |
5294e256 RW |
977 | if (pm) { |
978 | if (pm->thaw) | |
979 | error = pm->thaw(dev); | |
980 | } else { | |
981 | pci_pm_reenable_device(pci_dev); | |
982 | } | |
bbb44d9f | 983 | |
4b77b0a2 RW |
984 | pci_dev->state_saved = false; |
985 | ||
bbb44d9f RW |
986 | return error; |
987 | } | |
988 | ||
989 | static int pci_pm_poweroff(struct device *dev) | |
990 | { | |
355a72d7 | 991 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 992 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 993 | |
ad8cfa1d RW |
994 | if (pci_has_legacy_pm_support(pci_dev)) |
995 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 996 | |
5294e256 RW |
997 | if (!pm) { |
998 | pci_pm_default_suspend(pci_dev); | |
999 | goto Fixup; | |
1000 | } | |
1001 | ||
7cd0602d RW |
1002 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
1003 | pm_runtime_resume(dev); | |
1004 | ||
82fee4d6 | 1005 | pci_dev->state_saved = false; |
5294e256 | 1006 | if (pm->poweroff) { |
46939f8b RW |
1007 | int error; |
1008 | ||
ddb7c9d2 RW |
1009 | error = pm->poweroff(dev); |
1010 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1011 | if (error) |
1012 | return error; | |
bbb44d9f RW |
1013 | } |
1014 | ||
5294e256 RW |
1015 | Fixup: |
1016 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
c9b9972b | 1017 | |
699c1985 SO |
1018 | if (pcibios_pm_ops.poweroff) |
1019 | return pcibios_pm_ops.poweroff(dev); | |
1020 | ||
46939f8b | 1021 | return 0; |
bbb44d9f RW |
1022 | } |
1023 | ||
1024 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1025 | { | |
46939f8b | 1026 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1027 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1028 | |
bb808945 RW |
1029 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1030 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1031 | ||
7d2a01b8 AN |
1032 | if (!drv || !drv->pm) { |
1033 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1034 | return 0; |
7d2a01b8 | 1035 | } |
46939f8b RW |
1036 | |
1037 | if (drv->pm->poweroff_noirq) { | |
1038 | int error; | |
1039 | ||
d67e37d7 RW |
1040 | error = drv->pm->poweroff_noirq(dev); |
1041 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1042 | if (error) |
1043 | return error; | |
bbb44d9f RW |
1044 | } |
1045 | ||
326c1cda | 1046 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1047 | pci_prepare_to_sleep(pci_dev); |
1048 | ||
0b68c8e2 RW |
1049 | /* |
1050 | * The reason for doing this here is the same as for the analogous code | |
1051 | * in pci_pm_suspend_noirq(). | |
1052 | */ | |
1053 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1054 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1055 | ||
7d2a01b8 AN |
1056 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1057 | ||
699c1985 SO |
1058 | if (pcibios_pm_ops.poweroff_noirq) |
1059 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1060 | ||
46939f8b | 1061 | return 0; |
bbb44d9f RW |
1062 | } |
1063 | ||
f6dc1e5e | 1064 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1065 | { |
1066 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1067 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1068 | int error = 0; |
bbb44d9f | 1069 | |
699c1985 SO |
1070 | if (pcibios_pm_ops.restore_noirq) { |
1071 | error = pcibios_pm_ops.restore_noirq(dev); | |
1072 | if (error) | |
1073 | return error; | |
1074 | } | |
1075 | ||
6cbf8214 | 1076 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1077 | |
ad8cfa1d | 1078 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1079 | return pci_legacy_resume_early(dev); |
bb808945 | 1080 | |
f6dc1e5e RW |
1081 | if (drv && drv->pm && drv->pm->restore_noirq) |
1082 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1083 | |
1084 | return error; | |
1085 | } | |
1086 | ||
f6dc1e5e | 1087 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1088 | { |
1089 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1090 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1091 | int error = 0; |
1092 | ||
699c1985 SO |
1093 | if (pcibios_pm_ops.restore) { |
1094 | error = pcibios_pm_ops.restore(dev); | |
1095 | if (error) | |
1096 | return error; | |
1097 | } | |
1098 | ||
418e4da3 RW |
1099 | /* |
1100 | * This is necessary for the hibernation error path in which restore is | |
1101 | * called without restoring the standard config registers of the device. | |
1102 | */ | |
1103 | if (pci_dev->state_saved) | |
1104 | pci_restore_standard_config(pci_dev); | |
1105 | ||
ad8cfa1d | 1106 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1107 | return pci_legacy_resume(dev); |
bb808945 | 1108 | |
5294e256 | 1109 | pci_pm_default_resume(pci_dev); |
73410429 | 1110 | |
5294e256 RW |
1111 | if (pm) { |
1112 | if (pm->restore) | |
1113 | error = pm->restore(dev); | |
1114 | } else { | |
1115 | pci_pm_reenable_device(pci_dev); | |
1116 | } | |
bbb44d9f RW |
1117 | |
1118 | return error; | |
c8958177 | 1119 | } |
1da177e4 | 1120 | |
1f112cee | 1121 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1122 | |
1123 | #define pci_pm_freeze NULL | |
1124 | #define pci_pm_freeze_noirq NULL | |
1125 | #define pci_pm_thaw NULL | |
1126 | #define pci_pm_thaw_noirq NULL | |
1127 | #define pci_pm_poweroff NULL | |
1128 | #define pci_pm_poweroff_noirq NULL | |
1129 | #define pci_pm_restore NULL | |
1130 | #define pci_pm_restore_noirq NULL | |
1131 | ||
1f112cee | 1132 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1133 | |
fbb988be | 1134 | #ifdef CONFIG_PM |
6cbf8214 RW |
1135 | |
1136 | static int pci_pm_runtime_suspend(struct device *dev) | |
1137 | { | |
1138 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1139 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1140 | pci_power_t prev = pci_dev->current_state; | |
1141 | int error; | |
1142 | ||
967577b0 HY |
1143 | /* |
1144 | * If pci_dev->driver is not set (unbound), the device should | |
1145 | * always remain in D0 regardless of the runtime PM status | |
1146 | */ | |
1147 | if (!pci_dev->driver) | |
1148 | return 0; | |
1149 | ||
6cbf8214 RW |
1150 | if (!pm || !pm->runtime_suspend) |
1151 | return -ENOSYS; | |
1152 | ||
82fee4d6 | 1153 | pci_dev->state_saved = false; |
6cbf8214 | 1154 | error = pm->runtime_suspend(dev); |
06bf403d ID |
1155 | if (error) { |
1156 | /* | |
1157 | * -EBUSY and -EAGAIN is used to request the runtime PM core | |
1158 | * to schedule a new suspend, so log the event only with debug | |
1159 | * log level. | |
1160 | */ | |
1161 | if (error == -EBUSY || error == -EAGAIN) | |
1162 | dev_dbg(dev, "can't suspend now (%pf returned %d)\n", | |
1163 | pm->runtime_suspend, error); | |
1164 | else | |
1165 | dev_err(dev, "can't suspend (%pf returned %d)\n", | |
1166 | pm->runtime_suspend, error); | |
1167 | ||
6cbf8214 | 1168 | return error; |
06bf403d | 1169 | } |
6cbf8214 RW |
1170 | |
1171 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1172 | ||
1173 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1174 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1175 | WARN_ONCE(pci_dev->current_state != prev, | |
1176 | "PCI PM: State of device not saved by %pF\n", | |
1177 | pm->runtime_suspend); | |
1178 | return 0; | |
1179 | } | |
1180 | ||
42eca230 | 1181 | if (!pci_dev->state_saved) { |
6cbf8214 | 1182 | pci_save_state(pci_dev); |
42eca230 DA |
1183 | pci_finish_runtime_suspend(pci_dev); |
1184 | } | |
6cbf8214 RW |
1185 | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | static int pci_pm_runtime_resume(struct device *dev) | |
1190 | { | |
448bd857 | 1191 | int rc; |
6cbf8214 RW |
1192 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1193 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1194 | ||
967577b0 HY |
1195 | /* |
1196 | * If pci_dev->driver is not set (unbound), the device should | |
1197 | * always remain in D0 regardless of the runtime PM status | |
1198 | */ | |
1199 | if (!pci_dev->driver) | |
1200 | return 0; | |
1201 | ||
6cbf8214 RW |
1202 | if (!pm || !pm->runtime_resume) |
1203 | return -ENOSYS; | |
1204 | ||
db288c9c RW |
1205 | pci_restore_standard_config(pci_dev); |
1206 | pci_fixup_device(pci_fixup_resume_early, pci_dev); | |
6cbf8214 RW |
1207 | __pci_enable_wake(pci_dev, PCI_D0, true, false); |
1208 | pci_fixup_device(pci_fixup_resume, pci_dev); | |
1209 | ||
448bd857 HY |
1210 | rc = pm->runtime_resume(dev); |
1211 | ||
1212 | pci_dev->runtime_d3cold = false; | |
1213 | ||
1214 | return rc; | |
6cbf8214 RW |
1215 | } |
1216 | ||
1217 | static int pci_pm_runtime_idle(struct device *dev) | |
1218 | { | |
967577b0 | 1219 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1220 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1221 | int ret = 0; |
6cbf8214 | 1222 | |
967577b0 HY |
1223 | /* |
1224 | * If pci_dev->driver is not set (unbound), the device should | |
1225 | * always remain in D0 regardless of the runtime PM status | |
1226 | */ | |
1227 | if (!pci_dev->driver) | |
45f0a85c | 1228 | return 0; |
967577b0 | 1229 | |
6cbf8214 RW |
1230 | if (!pm) |
1231 | return -ENOSYS; | |
1232 | ||
45f0a85c RW |
1233 | if (pm->runtime_idle) |
1234 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1235 | |
45f0a85c | 1236 | return ret; |
6cbf8214 RW |
1237 | } |
1238 | ||
f91da04d | 1239 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1240 | .prepare = pci_pm_prepare, |
2cef548a | 1241 | .complete = pci_pm_complete, |
adf09493 RW |
1242 | .suspend = pci_pm_suspend, |
1243 | .resume = pci_pm_resume, | |
1244 | .freeze = pci_pm_freeze, | |
1245 | .thaw = pci_pm_thaw, | |
1246 | .poweroff = pci_pm_poweroff, | |
1247 | .restore = pci_pm_restore, | |
bbb44d9f RW |
1248 | .suspend_noirq = pci_pm_suspend_noirq, |
1249 | .resume_noirq = pci_pm_resume_noirq, | |
1250 | .freeze_noirq = pci_pm_freeze_noirq, | |
1251 | .thaw_noirq = pci_pm_thaw_noirq, | |
1252 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1253 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1254 | .runtime_suspend = pci_pm_runtime_suspend, |
1255 | .runtime_resume = pci_pm_runtime_resume, | |
1256 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1257 | }; |
1258 | ||
adf09493 | 1259 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1260 | |
fbb988be RW |
1261 | #else /* !CONFIG_PM */ |
1262 | ||
1263 | #define pci_pm_runtime_suspend NULL | |
1264 | #define pci_pm_runtime_resume NULL | |
1265 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1266 | |
1267 | #define PCI_PM_OPS_PTR NULL | |
1268 | ||
fbb988be | 1269 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1270 | |
1da177e4 | 1271 | /** |
863b18f4 | 1272 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1273 | * @drv: the driver structure to register |
863b18f4 | 1274 | * @owner: owner module of drv |
f95d882d | 1275 | * @mod_name: module name string |
f7625980 | 1276 | * |
1da177e4 | 1277 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1278 | * Returns a negative value on error, otherwise 0. |
1279 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1280 | * no device was claimed during registration. |
1281 | */ | |
725522b5 GKH |
1282 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1283 | const char *mod_name) | |
1da177e4 | 1284 | { |
1da177e4 LT |
1285 | /* initialize common driver fields */ |
1286 | drv->driver.name = drv->name; | |
1287 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1288 | drv->driver.owner = owner; |
725522b5 | 1289 | drv->driver.mod_name = mod_name; |
50b00755 | 1290 | |
75865858 GKH |
1291 | spin_lock_init(&drv->dynids.lock); |
1292 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1293 | |
1294 | /* register with core */ | |
bfb09a86 | 1295 | return driver_register(&drv->driver); |
1da177e4 | 1296 | } |
b7fe9434 | 1297 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1298 | |
1299 | /** | |
1300 | * pci_unregister_driver - unregister a pci driver | |
1301 | * @drv: the driver structure to unregister | |
f7625980 | 1302 | * |
1da177e4 LT |
1303 | * Deletes the driver structure from the list of registered PCI drivers, |
1304 | * gives it a chance to clean up by calling its remove() function for | |
1305 | * each device it was responsible for, and marks those devices as | |
1306 | * driverless. | |
1307 | */ | |
1308 | ||
3c78bc61 | 1309 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1310 | { |
1311 | driver_unregister(&drv->driver); | |
1312 | pci_free_dynids(drv); | |
1313 | } | |
b7fe9434 | 1314 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1315 | |
1316 | static struct pci_driver pci_compat_driver = { | |
1317 | .name = "compat" | |
1318 | }; | |
1319 | ||
1320 | /** | |
1321 | * pci_dev_driver - get the pci_driver of a device | |
1322 | * @dev: the device to query | |
1323 | * | |
f7625980 | 1324 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1325 | * registered driver for the device. |
1326 | */ | |
3c78bc61 | 1327 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1328 | { |
1329 | if (dev->driver) | |
1330 | return dev->driver; | |
1331 | else { | |
1332 | int i; | |
3c78bc61 | 1333 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1334 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1335 | return &pci_compat_driver; | |
1336 | } | |
1337 | return NULL; | |
1338 | } | |
b7fe9434 | 1339 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1340 | |
1341 | /** | |
1342 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1343 | * @dev: the PCI device structure to match against |
8f7020d3 | 1344 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1345 | * |
1da177e4 | 1346 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1347 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1348 | * pci_device_id structure or %NULL if there is no match. |
1349 | */ | |
75865858 | 1350 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1351 | { |
75865858 | 1352 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1353 | struct pci_driver *pci_drv; |
1da177e4 LT |
1354 | const struct pci_device_id *found_id; |
1355 | ||
58d9a38f YL |
1356 | if (!pci_dev->match_driver) |
1357 | return 0; | |
1358 | ||
1359 | pci_drv = to_pci_driver(drv); | |
75865858 | 1360 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1361 | if (found_id) |
1362 | return 1; | |
1363 | ||
75865858 | 1364 | return 0; |
1da177e4 LT |
1365 | } |
1366 | ||
1367 | /** | |
1368 | * pci_dev_get - increments the reference count of the pci device structure | |
1369 | * @dev: the device being referenced | |
1370 | * | |
1371 | * Each live reference to a device should be refcounted. | |
1372 | * | |
1373 | * Drivers for PCI devices should normally record such references in | |
1374 | * their probe() methods, when they bind to a device, and release | |
1375 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1376 | * | |
1377 | * A pointer to the device with the incremented reference counter is returned. | |
1378 | */ | |
1379 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1380 | { | |
1381 | if (dev) | |
1382 | get_device(&dev->dev); | |
1383 | return dev; | |
1384 | } | |
b7fe9434 | 1385 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1386 | |
1387 | /** | |
1388 | * pci_dev_put - release a use of the pci device structure | |
1389 | * @dev: device that's been disconnected | |
1390 | * | |
1391 | * Must be called when a user of a device is finished with it. When the last | |
1392 | * user of the device calls this function, the memory of the device is freed. | |
1393 | */ | |
1394 | void pci_dev_put(struct pci_dev *dev) | |
1395 | { | |
1396 | if (dev) | |
1397 | put_device(&dev->dev); | |
1398 | } | |
b7fe9434 | 1399 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1400 | |
8ccc9aa1 BP |
1401 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1402 | { | |
1403 | struct pci_dev *pdev; | |
1404 | ||
1405 | if (!dev) | |
1406 | return -ENODEV; | |
1407 | ||
1408 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1409 | |
1410 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1411 | return -ENOMEM; | |
1412 | ||
1413 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1414 | return -ENOMEM; | |
1415 | ||
1416 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1417 | pdev->subsystem_device)) | |
1418 | return -ENOMEM; | |
1419 | ||
1420 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1421 | return -ENOMEM; | |
1422 | ||
145b3fe5 | 1423 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1424 | pdev->vendor, pdev->device, |
1425 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1426 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1427 | (u8)(pdev->class))) | |
1428 | return -ENOMEM; | |
efdd4070 | 1429 | |
8ccc9aa1 BP |
1430 | return 0; |
1431 | } | |
1432 | ||
02e0bea6 PS |
1433 | static int pci_bus_num_vf(struct device *dev) |
1434 | { | |
1435 | return pci_num_vf(to_pci_dev(dev)); | |
1436 | } | |
1437 | ||
1da177e4 LT |
1438 | struct bus_type pci_bus_type = { |
1439 | .name = "pci", | |
1440 | .match = pci_bus_match, | |
312c004d | 1441 | .uevent = pci_uevent, |
b15d686a RK |
1442 | .probe = pci_device_probe, |
1443 | .remove = pci_device_remove, | |
cbd69dbb | 1444 | .shutdown = pci_device_shutdown, |
5136b2da | 1445 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1446 | .bus_groups = pci_bus_groups, |
2229c1fb | 1447 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1448 | .pm = PCI_PM_OPS_PTR, |
02e0bea6 | 1449 | .num_vf = pci_bus_num_vf, |
1da177e4 | 1450 | }; |
b7fe9434 | 1451 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 LT |
1452 | |
1453 | static int __init pci_driver_init(void) | |
1454 | { | |
1455 | return bus_register(&pci_bus_type); | |
1456 | } | |
1da177e4 | 1457 | postcore_initcall(pci_driver_init); |