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8cfab3cf | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
2b937303 GKH |
3 | * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com> |
4 | * (C) Copyright 2007 Novell Inc. | |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/pci.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/init.h> | |
10 | #include <linux/device.h> | |
d42c6997 | 11 | #include <linux/mempolicy.h> |
4e57b681 TS |
12 | #include <linux/string.h> |
13 | #include <linux/slab.h> | |
8c65b4a6 | 14 | #include <linux/sched.h> |
873392ca | 15 | #include <linux/cpu.h> |
6cbf8214 | 16 | #include <linux/pm_runtime.h> |
eea3fc03 | 17 | #include <linux/suspend.h> |
4fc9bbf9 | 18 | #include <linux/kexec.h> |
1da177e4 | 19 | #include "pci.h" |
c6c889d9 | 20 | #include "pcie/portdrv.h" |
1da177e4 | 21 | |
75865858 GKH |
22 | struct pci_dynid { |
23 | struct list_head node; | |
24 | struct pci_device_id id; | |
25 | }; | |
1da177e4 | 26 | |
9dba910e TH |
27 | /** |
28 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices | |
29 | * @drv: target pci driver | |
30 | * @vendor: PCI vendor ID | |
31 | * @device: PCI device ID | |
32 | * @subvendor: PCI subvendor ID | |
33 | * @subdevice: PCI subdevice ID | |
34 | * @class: PCI class | |
35 | * @class_mask: PCI class mask | |
36 | * @driver_data: private driver data | |
37 | * | |
38 | * Adds a new dynamic pci device ID to this driver and causes the | |
39 | * driver to probe for all devices again. @drv must have been | |
40 | * registered prior to calling this function. | |
41 | * | |
42 | * CONTEXT: | |
43 | * Does GFP_KERNEL allocation. | |
44 | * | |
45 | * RETURNS: | |
46 | * 0 on success, -errno on failure. | |
47 | */ | |
48 | int pci_add_dynid(struct pci_driver *drv, | |
49 | unsigned int vendor, unsigned int device, | |
50 | unsigned int subvendor, unsigned int subdevice, | |
51 | unsigned int class, unsigned int class_mask, | |
52 | unsigned long driver_data) | |
53 | { | |
54 | struct pci_dynid *dynid; | |
9dba910e TH |
55 | |
56 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
57 | if (!dynid) | |
58 | return -ENOMEM; | |
59 | ||
60 | dynid->id.vendor = vendor; | |
61 | dynid->id.device = device; | |
62 | dynid->id.subvendor = subvendor; | |
63 | dynid->id.subdevice = subdevice; | |
64 | dynid->id.class = class; | |
65 | dynid->id.class_mask = class_mask; | |
66 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 67 | |
9dba910e TH |
68 | spin_lock(&drv->dynids.lock); |
69 | list_add_tail(&dynid->node, &drv->dynids.list); | |
70 | spin_unlock(&drv->dynids.lock); | |
71 | ||
3b7f1016 | 72 | return driver_attach(&drv->driver); |
9dba910e | 73 | } |
b7fe9434 | 74 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
9dba910e TH |
75 | |
76 | static void pci_free_dynids(struct pci_driver *drv) | |
77 | { | |
78 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 79 | |
9dba910e TH |
80 | spin_lock(&drv->dynids.lock); |
81 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
82 | list_del(&dynid->node); | |
83 | kfree(dynid); | |
84 | } | |
85 | spin_unlock(&drv->dynids.lock); | |
86 | } | |
87 | ||
1da177e4 | 88 | /** |
9dba910e | 89 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
90 | * @driver: target device driver |
91 | * @buf: buffer for scanning device ID data | |
92 | * @count: input size | |
1da177e4 | 93 | * |
9dba910e | 94 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 95 | */ |
a9427741 | 96 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 97 | size_t count) |
1da177e4 | 98 | { |
1da177e4 | 99 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 100 | const struct pci_device_id *ids = pdrv->id_table; |
3c78bc61 RD |
101 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
102 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
103 | unsigned long driver_data = 0; | |
104 | int fields = 0; | |
8895d3bc | 105 | int retval = 0; |
1da177e4 | 106 | |
b41d6cf3 | 107 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
108 | &vendor, &device, &subvendor, &subdevice, |
109 | &class, &class_mask, &driver_data); | |
6ba18636 | 110 | if (fields < 2) |
1da177e4 LT |
111 | return -EINVAL; |
112 | ||
8895d3bc BD |
113 | if (fields != 7) { |
114 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
115 | if (!pdev) | |
116 | return -ENOMEM; | |
117 | ||
118 | pdev->vendor = vendor; | |
119 | pdev->device = device; | |
120 | pdev->subsystem_vendor = subvendor; | |
121 | pdev->subsystem_device = subdevice; | |
122 | pdev->class = class; | |
123 | ||
124 | if (pci_match_id(pdrv->id_table, pdev)) | |
125 | retval = -EEXIST; | |
126 | ||
127 | kfree(pdev); | |
128 | ||
129 | if (retval) | |
130 | return retval; | |
131 | } | |
132 | ||
b41d6cf3 JD |
133 | /* Only accept driver_data values that match an existing id_table |
134 | entry */ | |
2debb4d2 CW |
135 | if (ids) { |
136 | retval = -EINVAL; | |
137 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
138 | if (driver_data == ids->driver_data) { | |
139 | retval = 0; | |
140 | break; | |
141 | } | |
142 | ids++; | |
b41d6cf3 | 143 | } |
2debb4d2 CW |
144 | if (retval) /* No match */ |
145 | return retval; | |
b41d6cf3 | 146 | } |
b41d6cf3 | 147 | |
9dba910e TH |
148 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
149 | class, class_mask, driver_data); | |
b19441af GKH |
150 | if (retval) |
151 | return retval; | |
1da177e4 LT |
152 | return count; |
153 | } | |
a9427741 | 154 | static DRIVER_ATTR_WO(new_id); |
1da177e4 | 155 | |
0994375e CW |
156 | /** |
157 | * store_remove_id - remove a PCI device ID from this driver | |
158 | * @driver: target device driver | |
159 | * @buf: buffer for scanning device ID data | |
160 | * @count: input size | |
161 | * | |
162 | * Removes a dynamic pci device ID to this driver. | |
163 | */ | |
a9427741 | 164 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 165 | size_t count) |
0994375e CW |
166 | { |
167 | struct pci_dynid *dynid, *n; | |
168 | struct pci_driver *pdrv = to_pci_driver(driver); | |
169 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
170 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
171 | int fields = 0; | |
9222097f | 172 | size_t retval = -ENODEV; |
0994375e CW |
173 | |
174 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
175 | &vendor, &device, &subvendor, &subdevice, | |
176 | &class, &class_mask); | |
177 | if (fields < 2) | |
178 | return -EINVAL; | |
179 | ||
180 | spin_lock(&pdrv->dynids.lock); | |
181 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
182 | struct pci_device_id *id = &dynid->id; | |
183 | if ((id->vendor == vendor) && | |
184 | (id->device == device) && | |
185 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
186 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
187 | !((id->class ^ class) & class_mask)) { | |
188 | list_del(&dynid->node); | |
189 | kfree(dynid); | |
9222097f | 190 | retval = count; |
0994375e CW |
191 | break; |
192 | } | |
193 | } | |
194 | spin_unlock(&pdrv->dynids.lock); | |
195 | ||
9222097f | 196 | return retval; |
0994375e | 197 | } |
a9427741 | 198 | static DRIVER_ATTR_WO(remove_id); |
0994375e | 199 | |
2229c1fb GKH |
200 | static struct attribute *pci_drv_attrs[] = { |
201 | &driver_attr_new_id.attr, | |
202 | &driver_attr_remove_id.attr, | |
203 | NULL, | |
bfb09a86 | 204 | }; |
2229c1fb | 205 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 206 | |
1da177e4 | 207 | /** |
75865858 | 208 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 209 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
210 | * @dev: the PCI device structure to match against. |
211 | * | |
1da177e4 | 212 | * Used by a driver to check whether a PCI device present in the |
75865858 | 213 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 214 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 215 | * |
8b60756a | 216 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 217 | * that a driver might want to check for. |
1da177e4 | 218 | */ |
75865858 GKH |
219 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
220 | struct pci_dev *dev) | |
1da177e4 | 221 | { |
75865858 GKH |
222 | if (ids) { |
223 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
224 | if (pci_match_one_device(ids, dev)) | |
225 | return ids; | |
226 | ids++; | |
227 | } | |
1da177e4 LT |
228 | } |
229 | return NULL; | |
230 | } | |
b7fe9434 | 231 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 232 | |
782a985d AW |
233 | static const struct pci_device_id pci_device_id_any = { |
234 | .vendor = PCI_ANY_ID, | |
235 | .device = PCI_ANY_ID, | |
236 | .subvendor = PCI_ANY_ID, | |
237 | .subdevice = PCI_ANY_ID, | |
238 | }; | |
239 | ||
1da177e4 | 240 | /** |
ae9608af | 241 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 242 | * @drv: the PCI driver to match against |
39ba487f | 243 | * @dev: the PCI device structure to match against |
75865858 GKH |
244 | * |
245 | * Used by a driver to check whether a PCI device present in the | |
246 | * system is in its list of supported devices. Returns the matching | |
247 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 248 | */ |
d73460d7 AB |
249 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
250 | struct pci_dev *dev) | |
75865858 | 251 | { |
75865858 | 252 | struct pci_dynid *dynid; |
782a985d AW |
253 | const struct pci_device_id *found_id = NULL; |
254 | ||
255 | /* When driver_override is set, only bind to the matching driver */ | |
256 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
257 | return NULL; | |
1da177e4 | 258 | |
7461b60a | 259 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
260 | spin_lock(&drv->dynids.lock); |
261 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
262 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
263 | found_id = &dynid->id; |
264 | break; | |
75865858 | 265 | } |
1da177e4 | 266 | } |
75865858 | 267 | spin_unlock(&drv->dynids.lock); |
7461b60a | 268 | |
782a985d AW |
269 | if (!found_id) |
270 | found_id = pci_match_id(drv->id_table, dev); | |
271 | ||
272 | /* driver_override will always match, send a dummy id */ | |
273 | if (!found_id && dev->driver_override) | |
274 | found_id = &pci_device_id_any; | |
275 | ||
276 | return found_id; | |
1da177e4 LT |
277 | } |
278 | ||
873392ca RR |
279 | struct drv_dev_and_id { |
280 | struct pci_driver *drv; | |
281 | struct pci_dev *dev; | |
282 | const struct pci_device_id *id; | |
283 | }; | |
284 | ||
285 | static long local_pci_probe(void *_ddi) | |
286 | { | |
287 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
288 | struct pci_dev *pci_dev = ddi->dev; |
289 | struct pci_driver *pci_drv = ddi->drv; | |
290 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
291 | int rc; |
292 | ||
967577b0 HY |
293 | /* |
294 | * Unbound PCI devices are always put in D0, regardless of | |
295 | * runtime PM status. During probe, the device is set to | |
296 | * active and the usage count is incremented. If the driver | |
a8360062 RW |
297 | * supports runtime PM, it should call pm_runtime_put_noidle(), |
298 | * or any other runtime PM helper function decrementing the usage | |
299 | * count, in its probe routine and pm_runtime_get_noresume() in | |
300 | * its remove routine. | |
f3ec4f87 | 301 | */ |
967577b0 HY |
302 | pm_runtime_get_sync(dev); |
303 | pci_dev->driver = pci_drv; | |
304 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
305 | if (!rc) |
306 | return rc; | |
307 | if (rc < 0) { | |
967577b0 HY |
308 | pci_dev->driver = NULL; |
309 | pm_runtime_put_sync(dev); | |
f92d74c1 | 310 | return rc; |
f3ec4f87 | 311 | } |
f92d74c1 SC |
312 | /* |
313 | * Probe function should return < 0 for failure, 0 for success | |
314 | * Treat values > 0 as success, but warn. | |
315 | */ | |
316 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
317 | return 0; | |
873392ca RR |
318 | } |
319 | ||
0b2c2a71 TG |
320 | static bool pci_physfn_is_probed(struct pci_dev *dev) |
321 | { | |
322 | #ifdef CONFIG_PCI_IOV | |
323 | return dev->is_virtfn && dev->physfn->is_probed; | |
324 | #else | |
325 | return false; | |
326 | #endif | |
327 | } | |
328 | ||
d42c6997 AK |
329 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
330 | const struct pci_device_id *id) | |
331 | { | |
0b2c2a71 | 332 | int error, node, cpu; |
873392ca RR |
333 | struct drv_dev_and_id ddi = { drv, dev, id }; |
334 | ||
12c3156f AD |
335 | /* |
336 | * Execute driver initialization on node where the device is | |
337 | * attached. This way the driver likely allocates its local memory | |
338 | * on the right node. | |
339 | */ | |
873392ca | 340 | node = dev_to_node(&dev->dev); |
0b2c2a71 TG |
341 | dev->is_probed = 1; |
342 | ||
343 | cpu_hotplug_disable(); | |
12c3156f AD |
344 | |
345 | /* | |
0b2c2a71 TG |
346 | * Prevent nesting work_on_cpu() for the case where a Virtual Function |
347 | * device is probed from work_on_cpu() of the Physical device. | |
12c3156f | 348 | */ |
0b2c2a71 TG |
349 | if (node < 0 || node >= MAX_NUMNODES || !node_online(node) || |
350 | pci_physfn_is_probed(dev)) | |
351 | cpu = nr_cpu_ids; | |
352 | else | |
a70f7302 | 353 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
0b2c2a71 TG |
354 | |
355 | if (cpu < nr_cpu_ids) | |
356 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
357 | else | |
873392ca | 358 | error = local_pci_probe(&ddi); |
12c3156f | 359 | |
0b2c2a71 TG |
360 | dev->is_probed = 0; |
361 | cpu_hotplug_enable(); | |
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 | ||
0e7df224 BW |
397 | #ifdef CONFIG_PCI_IOV |
398 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
399 | { | |
400 | return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe); | |
401 | } | |
402 | #else | |
403 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
404 | { | |
405 | return true; | |
406 | } | |
407 | #endif | |
408 | ||
3c78bc61 | 409 | static int pci_device_probe(struct device *dev) |
1da177e4 | 410 | { |
890e4847 JL |
411 | int error; |
412 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
413 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
414 | ||
30fdfb92 MM |
415 | pci_assign_irq(pci_dev); |
416 | ||
890e4847 JL |
417 | error = pcibios_alloc_irq(pci_dev); |
418 | if (error < 0) | |
419 | return error; | |
1da177e4 | 420 | |
1da177e4 | 421 | pci_dev_get(pci_dev); |
0e7df224 BW |
422 | if (pci_device_can_probe(pci_dev)) { |
423 | error = __pci_device_probe(drv, pci_dev); | |
424 | if (error) { | |
425 | pcibios_free_irq(pci_dev); | |
426 | pci_dev_put(pci_dev); | |
427 | } | |
890e4847 | 428 | } |
1da177e4 LT |
429 | |
430 | return error; | |
431 | } | |
432 | ||
3c78bc61 | 433 | static int pci_device_remove(struct device *dev) |
1da177e4 | 434 | { |
3c78bc61 RD |
435 | struct pci_dev *pci_dev = to_pci_dev(dev); |
436 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
437 | |
438 | if (drv) { | |
f3ec4f87 AS |
439 | if (drv->remove) { |
440 | pm_runtime_get_sync(dev); | |
1da177e4 | 441 | drv->remove(pci_dev); |
f3ec4f87 AS |
442 | pm_runtime_put_noidle(dev); |
443 | } | |
890e4847 | 444 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
445 | pci_dev->driver = NULL; |
446 | } | |
447 | ||
f3ec4f87 | 448 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 449 | pm_runtime_put_sync(dev); |
f3ec4f87 | 450 | |
2449e06a SL |
451 | /* |
452 | * If the device is still on, set the power state as "unknown", | |
453 | * since it might change by the next time we load the driver. | |
454 | */ | |
455 | if (pci_dev->current_state == PCI_D0) | |
456 | pci_dev->current_state = PCI_UNKNOWN; | |
457 | ||
1da177e4 LT |
458 | /* |
459 | * We would love to complain here if pci_dev->is_enabled is set, that | |
460 | * the driver should have called pci_disable_device(), but the | |
461 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 462 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
463 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
464 | * horrible the crap we have to deal with is when we are awake... | |
465 | */ | |
466 | ||
467 | pci_dev_put(pci_dev); | |
468 | return 0; | |
469 | } | |
470 | ||
bbb44d9f RW |
471 | static void pci_device_shutdown(struct device *dev) |
472 | { | |
473 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
474 | struct pci_driver *drv = pci_dev->driver; | |
475 | ||
3ff2de9b HY |
476 | pm_runtime_resume(dev); |
477 | ||
bbb44d9f RW |
478 | if (drv && drv->shutdown) |
479 | drv->shutdown(pci_dev); | |
5b415f1e | 480 | |
b566a22c | 481 | /* |
4fc9bbf9 KA |
482 | * If this is a kexec reboot, turn off Bus Master bit on the |
483 | * device to tell it to not continue to do DMA. Don't touch | |
484 | * devices in D3cold or unknown states. | |
485 | * If it is not a kexec reboot, firmware will hit the PCI | |
486 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 487 | */ |
4fc9bbf9 | 488 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 489 | pci_clear_master(pci_dev); |
bbb44d9f RW |
490 | } |
491 | ||
aa338601 | 492 | #ifdef CONFIG_PM |
6cbf8214 RW |
493 | |
494 | /* Auxiliary functions used for system resume and run-time resume. */ | |
495 | ||
496 | /** | |
497 | * pci_restore_standard_config - restore standard config registers of PCI device | |
498 | * @pci_dev: PCI device to handle | |
499 | */ | |
500 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
501 | { | |
502 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
503 | ||
504 | if (pci_dev->current_state != PCI_D0) { | |
505 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
506 | if (error) | |
507 | return error; | |
508 | } | |
509 | ||
1d3c16a8 | 510 | pci_restore_state(pci_dev); |
0ce3fcaf | 511 | pci_pme_restore(pci_dev); |
1d3c16a8 | 512 | return 0; |
6cbf8214 RW |
513 | } |
514 | ||
db288c9c RW |
515 | #endif |
516 | ||
517 | #ifdef CONFIG_PM_SLEEP | |
518 | ||
6cbf8214 RW |
519 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
520 | { | |
db288c9c RW |
521 | pci_power_up(pci_dev); |
522 | pci_restore_state(pci_dev); | |
0ce3fcaf | 523 | pci_pme_restore(pci_dev); |
6cbf8214 RW |
524 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
525 | } | |
526 | ||
fa58d305 RW |
527 | /* |
528 | * Default "suspend" method for devices that have no driver provided suspend, | |
529 | * or not even a driver at all (second part). | |
bbb44d9f | 530 | */ |
bb808945 | 531 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 532 | { |
bbb44d9f RW |
533 | /* |
534 | * mark its power state as "unknown", since we don't know if | |
535 | * e.g. the BIOS will change its device state when we suspend. | |
536 | */ | |
537 | if (pci_dev->current_state == PCI_D0) | |
538 | pci_dev->current_state = PCI_UNKNOWN; | |
539 | } | |
540 | ||
355a72d7 RW |
541 | /* |
542 | * Default "resume" method for devices that have no driver provided resume, | |
543 | * or not even a driver at all (second part). | |
544 | */ | |
bb808945 | 545 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
546 | { |
547 | int retval; | |
548 | ||
bbb44d9f RW |
549 | /* if the device was enabled before suspend, reenable */ |
550 | retval = pci_reenable_device(pci_dev); | |
551 | /* | |
552 | * if the device was busmaster before the suspend, make it busmaster | |
553 | * again | |
554 | */ | |
555 | if (pci_dev->is_busmaster) | |
556 | pci_set_master(pci_dev); | |
557 | ||
558 | return retval; | |
559 | } | |
560 | ||
561 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 562 | { |
3c78bc61 RD |
563 | struct pci_dev *pci_dev = to_pci_dev(dev); |
564 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 565 | |
02669492 | 566 | if (drv && drv->suspend) { |
99dadce8 | 567 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 568 | int error; |
aa8c6c93 | 569 | |
57ef8026 FP |
570 | error = drv->suspend(pci_dev, state); |
571 | suspend_report_result(drv->suspend, error); | |
572 | if (error) | |
573 | return error; | |
aa8c6c93 | 574 | |
46939f8b | 575 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
576 | && pci_dev->current_state != PCI_UNKNOWN) { |
577 | WARN_ONCE(pci_dev->current_state != prev, | |
578 | "PCI PM: Device state not saved by %pF\n", | |
579 | drv->suspend); | |
99dadce8 | 580 | } |
02669492 | 581 | } |
ad8cfa1d RW |
582 | |
583 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
584 | ||
46939f8b | 585 | return 0; |
1da177e4 LT |
586 | } |
587 | ||
bbb44d9f | 588 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 589 | { |
3c78bc61 RD |
590 | struct pci_dev *pci_dev = to_pci_dev(dev); |
591 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
592 | |
593 | if (drv && drv->suspend_late) { | |
46939f8b RW |
594 | pci_power_t prev = pci_dev->current_state; |
595 | int error; | |
596 | ||
57ef8026 FP |
597 | error = drv->suspend_late(pci_dev, state); |
598 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
599 | if (error) |
600 | return error; | |
601 | ||
602 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
603 | && pci_dev->current_state != PCI_UNKNOWN) { | |
604 | WARN_ONCE(pci_dev->current_state != prev, | |
605 | "PCI PM: Device state not saved by %pF\n", | |
606 | drv->suspend_late); | |
7d2a01b8 | 607 | goto Fixup; |
46939f8b | 608 | } |
cbd69dbb | 609 | } |
46939f8b RW |
610 | |
611 | if (!pci_dev->state_saved) | |
612 | pci_save_state(pci_dev); | |
613 | ||
614 | pci_pm_set_unknown_state(pci_dev); | |
615 | ||
7d2a01b8 AN |
616 | Fixup: |
617 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
618 | ||
46939f8b | 619 | return 0; |
cbd69dbb | 620 | } |
1da177e4 | 621 | |
f6dc1e5e RW |
622 | static int pci_legacy_resume_early(struct device *dev) |
623 | { | |
3c78bc61 RD |
624 | struct pci_dev *pci_dev = to_pci_dev(dev); |
625 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 626 | |
aa8c6c93 RW |
627 | return drv && drv->resume_early ? |
628 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
629 | } |
630 | ||
bbb44d9f | 631 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 632 | { |
3c78bc61 RD |
633 | struct pci_dev *pci_dev = to_pci_dev(dev); |
634 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 635 | |
ad8cfa1d RW |
636 | pci_fixup_device(pci_fixup_resume, pci_dev); |
637 | ||
aa8c6c93 RW |
638 | return drv && drv->resume ? |
639 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
640 | } |
641 | ||
571ff758 RW |
642 | /* Auxiliary functions used by the new power management framework */ |
643 | ||
5294e256 | 644 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 645 | { |
73410429 | 646 | pci_fixup_device(pci_fixup_resume, pci_dev); |
baecc470 | 647 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
648 | } |
649 | ||
5294e256 | 650 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 651 | { |
5294e256 | 652 | /* Disable non-bridge devices without PM support */ |
326c1cda | 653 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 654 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
655 | } |
656 | ||
07e836e8 RW |
657 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
658 | { | |
659 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 660 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 661 | || drv->resume_early); |
bb808945 RW |
662 | |
663 | /* | |
664 | * Legacy PM support is used by default, so warn if the new framework is | |
665 | * supported as well. Drivers are supposed to support either the | |
666 | * former, or the latter, but not both at the same time. | |
667 | */ | |
82440a82 DF |
668 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
669 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
670 | |
671 | return ret; | |
07e836e8 RW |
672 | } |
673 | ||
571ff758 RW |
674 | /* New power management framework */ |
675 | ||
bbb44d9f RW |
676 | static int pci_pm_prepare(struct device *dev) |
677 | { | |
678 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 679 | |
bac2a909 RW |
680 | if (drv && drv->pm && drv->pm->prepare) { |
681 | int error = drv->pm->prepare(dev); | |
08810a41 | 682 | if (error < 0) |
bac2a909 | 683 | return error; |
08810a41 RW |
684 | |
685 | if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) | |
686 | return 0; | |
bac2a909 RW |
687 | } |
688 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
689 | } |
690 | ||
2cef548a RW |
691 | static void pci_pm_complete(struct device *dev) |
692 | { | |
a0d2a959 LW |
693 | struct pci_dev *pci_dev = to_pci_dev(dev); |
694 | ||
695 | pci_dev_complete_resume(pci_dev); | |
696 | pm_generic_complete(dev); | |
697 | ||
698 | /* Resume device if platform firmware has put it in reset-power-on */ | |
bd755d77 | 699 | if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) { |
a0d2a959 LW |
700 | pci_power_t pre_sleep_state = pci_dev->current_state; |
701 | ||
702 | pci_update_current_state(pci_dev, pci_dev->current_state); | |
703 | if (pci_dev->current_state < pre_sleep_state) | |
704 | pm_request_resume(dev); | |
705 | } | |
2cef548a | 706 | } |
bbb44d9f | 707 | |
6cbf8214 RW |
708 | #else /* !CONFIG_PM_SLEEP */ |
709 | ||
710 | #define pci_pm_prepare NULL | |
2cef548a | 711 | #define pci_pm_complete NULL |
6cbf8214 RW |
712 | |
713 | #endif /* !CONFIG_PM_SLEEP */ | |
714 | ||
bbb44d9f | 715 | #ifdef CONFIG_SUSPEND |
a39bd851 BH |
716 | static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev) |
717 | { | |
718 | /* | |
719 | * Some BIOSes forget to clear Root PME Status bits after system | |
720 | * wakeup, which breaks ACPI-based runtime wakeup on PCI Express. | |
721 | * Clear those bits now just in case (shouldn't hurt). | |
722 | */ | |
723 | if (pci_is_pcie(pci_dev) && | |
3620c714 BH |
724 | (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT || |
725 | pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC)) | |
a39bd851 BH |
726 | pcie_clear_root_pme_status(pci_dev); |
727 | } | |
bbb44d9f RW |
728 | |
729 | static int pci_pm_suspend(struct device *dev) | |
730 | { | |
731 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 732 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 733 | |
ad8cfa1d RW |
734 | if (pci_has_legacy_pm_support(pci_dev)) |
735 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 736 | |
5294e256 RW |
737 | if (!pm) { |
738 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 739 | return 0; |
5294e256 RW |
740 | } |
741 | ||
7cd0602d | 742 | /* |
c4b65157 RW |
743 | * PCI devices suspended at run time may need to be resumed at this |
744 | * point, because in general it may be necessary to reconfigure them for | |
745 | * system suspend. Namely, if the device is expected to wake up the | |
746 | * system from the sleep state, it may have to be reconfigured for this | |
747 | * purpose, or if the device is not expected to wake up the system from | |
748 | * the sleep state, it should be prevented from signaling wakeup events | |
749 | * going forward. | |
750 | * | |
751 | * Also if the driver of the device does not indicate that its system | |
752 | * suspend callbacks can cope with runtime-suspended devices, it is | |
753 | * better to resume the device from runtime suspend here. | |
7cd0602d | 754 | */ |
c4b65157 RW |
755 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
756 | !pci_dev_keep_suspended(pci_dev)) | |
757 | pm_runtime_resume(dev); | |
7cd0602d | 758 | |
82fee4d6 | 759 | pci_dev->state_saved = false; |
5294e256 RW |
760 | if (pm->suspend) { |
761 | pci_power_t prev = pci_dev->current_state; | |
762 | int error; | |
763 | ||
ddb7c9d2 RW |
764 | error = pm->suspend(dev); |
765 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
766 | if (error) |
767 | return error; | |
768 | ||
46939f8b | 769 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
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); | |
5294e256 | 774 | } |
bbb44d9f | 775 | } |
fa58d305 | 776 | |
5294e256 | 777 | return 0; |
bbb44d9f RW |
778 | } |
779 | ||
c4b65157 RW |
780 | static int pci_pm_suspend_late(struct device *dev) |
781 | { | |
782 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
783 | return 0; | |
784 | ||
785 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); | |
786 | ||
787 | return pm_generic_suspend_late(dev); | |
788 | } | |
789 | ||
bbb44d9f | 790 | static int pci_pm_suspend_noirq(struct device *dev) |
c8958177 | 791 | { |
355a72d7 | 792 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 793 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 794 | |
bd755d77 RW |
795 | if (dev_pm_smart_suspend_and_suspended(dev)) { |
796 | dev->power.may_skip_resume = true; | |
c4b65157 | 797 | return 0; |
bd755d77 | 798 | } |
c4b65157 | 799 | |
bb808945 RW |
800 | if (pci_has_legacy_pm_support(pci_dev)) |
801 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
802 | ||
931ff68a RW |
803 | if (!pm) { |
804 | pci_save_state(pci_dev); | |
7d2a01b8 | 805 | goto Fixup; |
931ff68a | 806 | } |
46939f8b RW |
807 | |
808 | if (pm->suspend_noirq) { | |
809 | pci_power_t prev = pci_dev->current_state; | |
810 | int error; | |
811 | ||
812 | error = pm->suspend_noirq(dev); | |
813 | suspend_report_result(pm->suspend_noirq, error); | |
814 | if (error) | |
815 | return error; | |
816 | ||
817 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
818 | && pci_dev->current_state != PCI_UNKNOWN) { | |
819 | WARN_ONCE(pci_dev->current_state != prev, | |
820 | "PCI PM: State of device not saved by %pF\n", | |
821 | pm->suspend_noirq); | |
7d2a01b8 | 822 | goto Fixup; |
46939f8b | 823 | } |
bbb44d9f RW |
824 | } |
825 | ||
46939f8b RW |
826 | if (!pci_dev->state_saved) { |
827 | pci_save_state(pci_dev); | |
9d26d3a8 | 828 | if (pci_power_manageable(pci_dev)) |
46939f8b RW |
829 | pci_prepare_to_sleep(pci_dev); |
830 | } | |
d67e37d7 | 831 | |
ca67ab5c RW |
832 | dev_dbg(dev, "PCI PM: Suspend power state: %s\n", |
833 | pci_power_name(pci_dev->current_state)); | |
834 | ||
46939f8b RW |
835 | pci_pm_set_unknown_state(pci_dev); |
836 | ||
dbf0e4c7 AS |
837 | /* |
838 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
839 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
840 | * hasn't been quiesced and tries to turn it off. If the controller | |
841 | * is already in D3, this can hang or cause memory corruption. | |
842 | * | |
843 | * Since the value of the COMMAND register doesn't matter once the | |
844 | * device has been suspended, we can safely set it to 0 here. | |
845 | */ | |
846 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
847 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
848 | ||
7d2a01b8 AN |
849 | Fixup: |
850 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
851 | ||
bd755d77 RW |
852 | /* |
853 | * If the target system sleep state is suspend-to-idle, it is sufficient | |
854 | * to check whether or not the device's wakeup settings are good for | |
855 | * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause | |
856 | * pci_pm_complete() to take care of fixing up the device's state | |
857 | * anyway, if need be. | |
858 | */ | |
859 | dev->power.may_skip_resume = device_may_wakeup(dev) || | |
860 | !device_can_wakeup(dev); | |
861 | ||
46939f8b | 862 | return 0; |
c8958177 | 863 | } |
1da177e4 | 864 | |
f6dc1e5e | 865 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
866 | { |
867 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
868 | struct device_driver *drv = dev->driver; | |
355a72d7 | 869 | int error = 0; |
bbb44d9f | 870 | |
bd755d77 RW |
871 | if (dev_pm_may_skip_resume(dev)) |
872 | return 0; | |
873 | ||
c4b65157 RW |
874 | /* |
875 | * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend | |
876 | * during system suspend, so update their runtime PM status to "active" | |
877 | * as they are going to be put into D0 shortly. | |
878 | */ | |
879 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
880 | pm_runtime_set_active(dev); | |
881 | ||
6cbf8214 | 882 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 883 | |
ad8cfa1d | 884 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 885 | return pci_legacy_resume_early(dev); |
bb808945 | 886 | |
a39bd851 BH |
887 | pcie_pme_root_status_cleanup(pci_dev); |
888 | ||
f6dc1e5e RW |
889 | if (drv && drv->pm && drv->pm->resume_noirq) |
890 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
891 | |
892 | return error; | |
893 | } | |
894 | ||
f6dc1e5e | 895 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 896 | { |
355a72d7 | 897 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 898 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
899 | int error = 0; |
900 | ||
418e4da3 RW |
901 | /* |
902 | * This is necessary for the suspend error path in which resume is | |
903 | * called without restoring the standard config registers of the device. | |
904 | */ | |
905 | if (pci_dev->state_saved) | |
906 | pci_restore_standard_config(pci_dev); | |
907 | ||
ad8cfa1d | 908 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 909 | return pci_legacy_resume(dev); |
bb808945 | 910 | |
5294e256 | 911 | pci_pm_default_resume(pci_dev); |
73410429 | 912 | |
5294e256 RW |
913 | if (pm) { |
914 | if (pm->resume) | |
915 | error = pm->resume(dev); | |
916 | } else { | |
917 | pci_pm_reenable_device(pci_dev); | |
918 | } | |
bbb44d9f | 919 | |
999cce4a | 920 | return error; |
bbb44d9f RW |
921 | } |
922 | ||
923 | #else /* !CONFIG_SUSPEND */ | |
924 | ||
925 | #define pci_pm_suspend NULL | |
c4b65157 | 926 | #define pci_pm_suspend_late NULL |
bbb44d9f RW |
927 | #define pci_pm_suspend_noirq NULL |
928 | #define pci_pm_resume NULL | |
929 | #define pci_pm_resume_noirq NULL | |
930 | ||
931 | #endif /* !CONFIG_SUSPEND */ | |
932 | ||
1f112cee | 933 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 934 | |
699c1985 SO |
935 | |
936 | /* | |
937 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
938 | * a hibernate transition | |
939 | */ | |
940 | struct dev_pm_ops __weak pcibios_pm_ops; | |
941 | ||
bbb44d9f RW |
942 | static int pci_pm_freeze(struct device *dev) |
943 | { | |
944 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 945 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 946 | |
ad8cfa1d RW |
947 | if (pci_has_legacy_pm_support(pci_dev)) |
948 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 949 | |
5294e256 RW |
950 | if (!pm) { |
951 | pci_pm_default_suspend(pci_dev); | |
952 | return 0; | |
bbb44d9f RW |
953 | } |
954 | ||
7cd0602d RW |
955 | /* |
956 | * This used to be done in pci_pm_prepare() for all devices and some | |
957 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
958 | * devices should not be touched during freeze/thaw transitions, | |
959 | * however. | |
960 | */ | |
ae860a19 | 961 | if (!dev_pm_smart_suspend_and_suspended(dev)) { |
c4b65157 | 962 | pm_runtime_resume(dev); |
ae860a19 MW |
963 | pci_dev->state_saved = false; |
964 | } | |
7cd0602d | 965 | |
5294e256 RW |
966 | if (pm->freeze) { |
967 | int error; | |
968 | ||
969 | error = pm->freeze(dev); | |
970 | suspend_report_result(pm->freeze, error); | |
971 | if (error) | |
972 | return error; | |
973 | } | |
974 | ||
5294e256 | 975 | return 0; |
bbb44d9f RW |
976 | } |
977 | ||
c4b65157 RW |
978 | static int pci_pm_freeze_late(struct device *dev) |
979 | { | |
980 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
981 | return 0; | |
982 | ||
bee344cb | 983 | return pm_generic_freeze_late(dev); |
c4b65157 RW |
984 | } |
985 | ||
bbb44d9f RW |
986 | static int pci_pm_freeze_noirq(struct device *dev) |
987 | { | |
355a72d7 | 988 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 989 | struct device_driver *drv = dev->driver; |
bbb44d9f | 990 | |
c4b65157 RW |
991 | if (dev_pm_smart_suspend_and_suspended(dev)) |
992 | return 0; | |
993 | ||
bb808945 RW |
994 | if (pci_has_legacy_pm_support(pci_dev)) |
995 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
996 | ||
d67e37d7 | 997 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
998 | int error; |
999 | ||
d67e37d7 RW |
1000 | error = drv->pm->freeze_noirq(dev); |
1001 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
1002 | if (error) |
1003 | return error; | |
bbb44d9f RW |
1004 | } |
1005 | ||
46939f8b RW |
1006 | if (!pci_dev->state_saved) |
1007 | pci_save_state(pci_dev); | |
d67e37d7 | 1008 | |
46939f8b RW |
1009 | pci_pm_set_unknown_state(pci_dev); |
1010 | ||
699c1985 SO |
1011 | if (pcibios_pm_ops.freeze_noirq) |
1012 | return pcibios_pm_ops.freeze_noirq(dev); | |
1013 | ||
46939f8b | 1014 | return 0; |
bbb44d9f RW |
1015 | } |
1016 | ||
f6dc1e5e | 1017 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 1018 | { |
355a72d7 | 1019 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
1020 | struct device_driver *drv = dev->driver; |
1021 | int error = 0; | |
1022 | ||
c4b65157 RW |
1023 | /* |
1024 | * If the device is in runtime suspend, the code below may not work | |
1025 | * correctly with it, so skip that code and make the PM core skip all of | |
1026 | * the subsequent "thaw" callbacks for the device. | |
1027 | */ | |
1028 | if (dev_pm_smart_suspend_and_suspended(dev)) { | |
3487972d | 1029 | dev_pm_skip_next_resume_phases(dev); |
c4b65157 RW |
1030 | return 0; |
1031 | } | |
1032 | ||
699c1985 SO |
1033 | if (pcibios_pm_ops.thaw_noirq) { |
1034 | error = pcibios_pm_ops.thaw_noirq(dev); | |
1035 | if (error) | |
1036 | return error; | |
1037 | } | |
1038 | ||
ad8cfa1d | 1039 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1040 | return pci_legacy_resume_early(dev); |
bb808945 | 1041 | |
5839ee73 RW |
1042 | /* |
1043 | * pci_restore_state() requires the device to be in D0 (because of MSI | |
1044 | * restoration among other things), so force it into D0 in case the | |
1045 | * driver's "freeze" callbacks put it into a low-power state directly. | |
1046 | */ | |
1047 | pci_set_power_state(pci_dev, PCI_D0); | |
e60514bd | 1048 | pci_restore_state(pci_dev); |
d67e37d7 | 1049 | |
f6dc1e5e RW |
1050 | if (drv && drv->pm && drv->pm->thaw_noirq) |
1051 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
1052 | |
1053 | return error; | |
1054 | } | |
1055 | ||
f6dc1e5e | 1056 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 1057 | { |
355a72d7 | 1058 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1059 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1060 | int error = 0; |
1061 | ||
ad8cfa1d | 1062 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1063 | return pci_legacy_resume(dev); |
bb808945 | 1064 | |
5294e256 RW |
1065 | if (pm) { |
1066 | if (pm->thaw) | |
1067 | error = pm->thaw(dev); | |
1068 | } else { | |
1069 | pci_pm_reenable_device(pci_dev); | |
1070 | } | |
bbb44d9f | 1071 | |
4b77b0a2 RW |
1072 | pci_dev->state_saved = false; |
1073 | ||
bbb44d9f RW |
1074 | return error; |
1075 | } | |
1076 | ||
1077 | static int pci_pm_poweroff(struct device *dev) | |
1078 | { | |
355a72d7 | 1079 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1080 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 1081 | |
ad8cfa1d RW |
1082 | if (pci_has_legacy_pm_support(pci_dev)) |
1083 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 1084 | |
5294e256 RW |
1085 | if (!pm) { |
1086 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 1087 | return 0; |
5294e256 RW |
1088 | } |
1089 | ||
7cd0602d | 1090 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
c4b65157 RW |
1091 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
1092 | !pci_dev_keep_suspended(pci_dev)) | |
1093 | pm_runtime_resume(dev); | |
7cd0602d | 1094 | |
82fee4d6 | 1095 | pci_dev->state_saved = false; |
5294e256 | 1096 | if (pm->poweroff) { |
46939f8b RW |
1097 | int error; |
1098 | ||
ddb7c9d2 RW |
1099 | error = pm->poweroff(dev); |
1100 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1101 | if (error) |
1102 | return error; | |
bbb44d9f RW |
1103 | } |
1104 | ||
46939f8b | 1105 | return 0; |
bbb44d9f | 1106 | } |
c9b9972b | 1107 | |
c4b65157 RW |
1108 | static int pci_pm_poweroff_late(struct device *dev) |
1109 | { | |
1110 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1111 | return 0; | |
699c1985 | 1112 | |
c4b65157 RW |
1113 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); |
1114 | ||
1115 | return pm_generic_poweroff_late(dev); | |
bbb44d9f RW |
1116 | } |
1117 | ||
1118 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1119 | { | |
46939f8b | 1120 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1121 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1122 | |
c4b65157 RW |
1123 | if (dev_pm_smart_suspend_and_suspended(dev)) |
1124 | return 0; | |
1125 | ||
bb808945 RW |
1126 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1127 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1128 | ||
7d2a01b8 AN |
1129 | if (!drv || !drv->pm) { |
1130 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1131 | return 0; |
7d2a01b8 | 1132 | } |
46939f8b RW |
1133 | |
1134 | if (drv->pm->poweroff_noirq) { | |
1135 | int error; | |
1136 | ||
d67e37d7 RW |
1137 | error = drv->pm->poweroff_noirq(dev); |
1138 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1139 | if (error) |
1140 | return error; | |
bbb44d9f RW |
1141 | } |
1142 | ||
326c1cda | 1143 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1144 | pci_prepare_to_sleep(pci_dev); |
1145 | ||
0b68c8e2 RW |
1146 | /* |
1147 | * The reason for doing this here is the same as for the analogous code | |
1148 | * in pci_pm_suspend_noirq(). | |
1149 | */ | |
1150 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1151 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1152 | ||
7d2a01b8 AN |
1153 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1154 | ||
699c1985 SO |
1155 | if (pcibios_pm_ops.poweroff_noirq) |
1156 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1157 | ||
46939f8b | 1158 | return 0; |
bbb44d9f RW |
1159 | } |
1160 | ||
f6dc1e5e | 1161 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1162 | { |
1163 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1164 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1165 | int error = 0; |
bbb44d9f | 1166 | |
c4b65157 RW |
1167 | /* This is analogous to the pci_pm_resume_noirq() case. */ |
1168 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1169 | pm_runtime_set_active(dev); | |
1170 | ||
699c1985 SO |
1171 | if (pcibios_pm_ops.restore_noirq) { |
1172 | error = pcibios_pm_ops.restore_noirq(dev); | |
1173 | if (error) | |
1174 | return error; | |
1175 | } | |
1176 | ||
6cbf8214 | 1177 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1178 | |
ad8cfa1d | 1179 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1180 | return pci_legacy_resume_early(dev); |
bb808945 | 1181 | |
f6dc1e5e RW |
1182 | if (drv && drv->pm && drv->pm->restore_noirq) |
1183 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1184 | |
1185 | return error; | |
1186 | } | |
1187 | ||
f6dc1e5e | 1188 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1189 | { |
1190 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1191 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1192 | int error = 0; |
1193 | ||
418e4da3 RW |
1194 | /* |
1195 | * This is necessary for the hibernation error path in which restore is | |
1196 | * called without restoring the standard config registers of the device. | |
1197 | */ | |
1198 | if (pci_dev->state_saved) | |
1199 | pci_restore_standard_config(pci_dev); | |
1200 | ||
ad8cfa1d | 1201 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1202 | return pci_legacy_resume(dev); |
bb808945 | 1203 | |
5294e256 | 1204 | pci_pm_default_resume(pci_dev); |
73410429 | 1205 | |
5294e256 RW |
1206 | if (pm) { |
1207 | if (pm->restore) | |
1208 | error = pm->restore(dev); | |
1209 | } else { | |
1210 | pci_pm_reenable_device(pci_dev); | |
1211 | } | |
bbb44d9f RW |
1212 | |
1213 | return error; | |
c8958177 | 1214 | } |
1da177e4 | 1215 | |
1f112cee | 1216 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1217 | |
1218 | #define pci_pm_freeze NULL | |
c4b65157 | 1219 | #define pci_pm_freeze_late NULL |
bbb44d9f RW |
1220 | #define pci_pm_freeze_noirq NULL |
1221 | #define pci_pm_thaw NULL | |
1222 | #define pci_pm_thaw_noirq NULL | |
1223 | #define pci_pm_poweroff NULL | |
c4b65157 | 1224 | #define pci_pm_poweroff_late NULL |
bbb44d9f RW |
1225 | #define pci_pm_poweroff_noirq NULL |
1226 | #define pci_pm_restore NULL | |
1227 | #define pci_pm_restore_noirq NULL | |
1228 | ||
1f112cee | 1229 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1230 | |
fbb988be | 1231 | #ifdef CONFIG_PM |
6cbf8214 RW |
1232 | |
1233 | static int pci_pm_runtime_suspend(struct device *dev) | |
1234 | { | |
1235 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1236 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1237 | pci_power_t prev = pci_dev->current_state; | |
1238 | int error; | |
1239 | ||
967577b0 | 1240 | /* |
5775b843 RW |
1241 | * If pci_dev->driver is not set (unbound), we leave the device in D0, |
1242 | * but it may go to D3cold when the bridge above it runtime suspends. | |
1243 | * Save its config space in case that happens. | |
967577b0 | 1244 | */ |
5775b843 RW |
1245 | if (!pci_dev->driver) { |
1246 | pci_save_state(pci_dev); | |
967577b0 | 1247 | return 0; |
5775b843 | 1248 | } |
967577b0 | 1249 | |
6cbf8214 RW |
1250 | if (!pm || !pm->runtime_suspend) |
1251 | return -ENOSYS; | |
1252 | ||
82fee4d6 | 1253 | pci_dev->state_saved = false; |
6cbf8214 | 1254 | error = pm->runtime_suspend(dev); |
06bf403d ID |
1255 | if (error) { |
1256 | /* | |
1257 | * -EBUSY and -EAGAIN is used to request the runtime PM core | |
1258 | * to schedule a new suspend, so log the event only with debug | |
1259 | * log level. | |
1260 | */ | |
1261 | if (error == -EBUSY || error == -EAGAIN) | |
1262 | dev_dbg(dev, "can't suspend now (%pf returned %d)\n", | |
1263 | pm->runtime_suspend, error); | |
1264 | else | |
1265 | dev_err(dev, "can't suspend (%pf returned %d)\n", | |
1266 | pm->runtime_suspend, error); | |
1267 | ||
6cbf8214 | 1268 | return error; |
06bf403d | 1269 | } |
6cbf8214 RW |
1270 | |
1271 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1272 | ||
1273 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1274 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1275 | WARN_ONCE(pci_dev->current_state != prev, | |
1276 | "PCI PM: State of device not saved by %pF\n", | |
1277 | pm->runtime_suspend); | |
1278 | return 0; | |
1279 | } | |
1280 | ||
42eca230 | 1281 | if (!pci_dev->state_saved) { |
6cbf8214 | 1282 | pci_save_state(pci_dev); |
42eca230 DA |
1283 | pci_finish_runtime_suspend(pci_dev); |
1284 | } | |
6cbf8214 RW |
1285 | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | static int pci_pm_runtime_resume(struct device *dev) | |
1290 | { | |
448bd857 | 1291 | int rc; |
6cbf8214 RW |
1292 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1293 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1294 | ||
967577b0 | 1295 | /* |
5775b843 RW |
1296 | * Restoring config space is necessary even if the device is not bound |
1297 | * to a driver because although we left it in D0, it may have gone to | |
1298 | * D3cold when the bridge above it runtime suspended. | |
967577b0 | 1299 | */ |
5775b843 RW |
1300 | pci_restore_standard_config(pci_dev); |
1301 | ||
967577b0 HY |
1302 | if (!pci_dev->driver) |
1303 | return 0; | |
1304 | ||
6cbf8214 RW |
1305 | if (!pm || !pm->runtime_resume) |
1306 | return -ENOSYS; | |
1307 | ||
db288c9c | 1308 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
0847684c | 1309 | pci_enable_wake(pci_dev, PCI_D0, false); |
6cbf8214 RW |
1310 | pci_fixup_device(pci_fixup_resume, pci_dev); |
1311 | ||
448bd857 HY |
1312 | rc = pm->runtime_resume(dev); |
1313 | ||
1314 | pci_dev->runtime_d3cold = false; | |
1315 | ||
1316 | return rc; | |
6cbf8214 RW |
1317 | } |
1318 | ||
1319 | static int pci_pm_runtime_idle(struct device *dev) | |
1320 | { | |
967577b0 | 1321 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1322 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1323 | int ret = 0; |
6cbf8214 | 1324 | |
967577b0 HY |
1325 | /* |
1326 | * If pci_dev->driver is not set (unbound), the device should | |
1327 | * always remain in D0 regardless of the runtime PM status | |
1328 | */ | |
1329 | if (!pci_dev->driver) | |
45f0a85c | 1330 | return 0; |
967577b0 | 1331 | |
6cbf8214 RW |
1332 | if (!pm) |
1333 | return -ENOSYS; | |
1334 | ||
45f0a85c RW |
1335 | if (pm->runtime_idle) |
1336 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1337 | |
45f0a85c | 1338 | return ret; |
6cbf8214 RW |
1339 | } |
1340 | ||
f91da04d | 1341 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1342 | .prepare = pci_pm_prepare, |
2cef548a | 1343 | .complete = pci_pm_complete, |
adf09493 | 1344 | .suspend = pci_pm_suspend, |
c4b65157 | 1345 | .suspend_late = pci_pm_suspend_late, |
adf09493 RW |
1346 | .resume = pci_pm_resume, |
1347 | .freeze = pci_pm_freeze, | |
c4b65157 | 1348 | .freeze_late = pci_pm_freeze_late, |
adf09493 RW |
1349 | .thaw = pci_pm_thaw, |
1350 | .poweroff = pci_pm_poweroff, | |
c4b65157 | 1351 | .poweroff_late = pci_pm_poweroff_late, |
adf09493 | 1352 | .restore = pci_pm_restore, |
bbb44d9f RW |
1353 | .suspend_noirq = pci_pm_suspend_noirq, |
1354 | .resume_noirq = pci_pm_resume_noirq, | |
1355 | .freeze_noirq = pci_pm_freeze_noirq, | |
1356 | .thaw_noirq = pci_pm_thaw_noirq, | |
1357 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1358 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1359 | .runtime_suspend = pci_pm_runtime_suspend, |
1360 | .runtime_resume = pci_pm_runtime_resume, | |
1361 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1362 | }; |
1363 | ||
adf09493 | 1364 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1365 | |
fbb988be RW |
1366 | #else /* !CONFIG_PM */ |
1367 | ||
1368 | #define pci_pm_runtime_suspend NULL | |
1369 | #define pci_pm_runtime_resume NULL | |
1370 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1371 | |
1372 | #define PCI_PM_OPS_PTR NULL | |
1373 | ||
fbb988be | 1374 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1375 | |
1da177e4 | 1376 | /** |
863b18f4 | 1377 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1378 | * @drv: the driver structure to register |
863b18f4 | 1379 | * @owner: owner module of drv |
f95d882d | 1380 | * @mod_name: module name string |
f7625980 | 1381 | * |
1da177e4 | 1382 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1383 | * Returns a negative value on error, otherwise 0. |
1384 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1385 | * no device was claimed during registration. |
1386 | */ | |
725522b5 GKH |
1387 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1388 | const char *mod_name) | |
1da177e4 | 1389 | { |
1da177e4 LT |
1390 | /* initialize common driver fields */ |
1391 | drv->driver.name = drv->name; | |
1392 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1393 | drv->driver.owner = owner; |
725522b5 | 1394 | drv->driver.mod_name = mod_name; |
92d50fc1 | 1395 | drv->driver.groups = drv->groups; |
50b00755 | 1396 | |
75865858 GKH |
1397 | spin_lock_init(&drv->dynids.lock); |
1398 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1399 | |
1400 | /* register with core */ | |
bfb09a86 | 1401 | return driver_register(&drv->driver); |
1da177e4 | 1402 | } |
b7fe9434 | 1403 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1404 | |
1405 | /** | |
1406 | * pci_unregister_driver - unregister a pci driver | |
1407 | * @drv: the driver structure to unregister | |
f7625980 | 1408 | * |
1da177e4 LT |
1409 | * Deletes the driver structure from the list of registered PCI drivers, |
1410 | * gives it a chance to clean up by calling its remove() function for | |
1411 | * each device it was responsible for, and marks those devices as | |
1412 | * driverless. | |
1413 | */ | |
1414 | ||
3c78bc61 | 1415 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1416 | { |
1417 | driver_unregister(&drv->driver); | |
1418 | pci_free_dynids(drv); | |
1419 | } | |
b7fe9434 | 1420 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1421 | |
1422 | static struct pci_driver pci_compat_driver = { | |
1423 | .name = "compat" | |
1424 | }; | |
1425 | ||
1426 | /** | |
1427 | * pci_dev_driver - get the pci_driver of a device | |
1428 | * @dev: the device to query | |
1429 | * | |
f7625980 | 1430 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1431 | * registered driver for the device. |
1432 | */ | |
3c78bc61 | 1433 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1434 | { |
1435 | if (dev->driver) | |
1436 | return dev->driver; | |
1437 | else { | |
1438 | int i; | |
3c78bc61 | 1439 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1440 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1441 | return &pci_compat_driver; | |
1442 | } | |
1443 | return NULL; | |
1444 | } | |
b7fe9434 | 1445 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1446 | |
1447 | /** | |
1448 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1449 | * @dev: the PCI device structure to match against |
8f7020d3 | 1450 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1451 | * |
1da177e4 | 1452 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1453 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1454 | * pci_device_id structure or %NULL if there is no match. |
1455 | */ | |
75865858 | 1456 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1457 | { |
75865858 | 1458 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1459 | struct pci_driver *pci_drv; |
1da177e4 LT |
1460 | const struct pci_device_id *found_id; |
1461 | ||
58d9a38f YL |
1462 | if (!pci_dev->match_driver) |
1463 | return 0; | |
1464 | ||
1465 | pci_drv = to_pci_driver(drv); | |
75865858 | 1466 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1467 | if (found_id) |
1468 | return 1; | |
1469 | ||
75865858 | 1470 | return 0; |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | /** | |
1474 | * pci_dev_get - increments the reference count of the pci device structure | |
1475 | * @dev: the device being referenced | |
1476 | * | |
1477 | * Each live reference to a device should be refcounted. | |
1478 | * | |
1479 | * Drivers for PCI devices should normally record such references in | |
1480 | * their probe() methods, when they bind to a device, and release | |
1481 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1482 | * | |
1483 | * A pointer to the device with the incremented reference counter is returned. | |
1484 | */ | |
1485 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1486 | { | |
1487 | if (dev) | |
1488 | get_device(&dev->dev); | |
1489 | return dev; | |
1490 | } | |
b7fe9434 | 1491 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1492 | |
1493 | /** | |
1494 | * pci_dev_put - release a use of the pci device structure | |
1495 | * @dev: device that's been disconnected | |
1496 | * | |
1497 | * Must be called when a user of a device is finished with it. When the last | |
1498 | * user of the device calls this function, the memory of the device is freed. | |
1499 | */ | |
1500 | void pci_dev_put(struct pci_dev *dev) | |
1501 | { | |
1502 | if (dev) | |
1503 | put_device(&dev->dev); | |
1504 | } | |
b7fe9434 | 1505 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1506 | |
8ccc9aa1 BP |
1507 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1508 | { | |
1509 | struct pci_dev *pdev; | |
1510 | ||
1511 | if (!dev) | |
1512 | return -ENODEV; | |
1513 | ||
1514 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1515 | |
1516 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1517 | return -ENOMEM; | |
1518 | ||
1519 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1520 | return -ENOMEM; | |
1521 | ||
1522 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1523 | pdev->subsystem_device)) | |
1524 | return -ENOMEM; | |
1525 | ||
1526 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1527 | return -ENOMEM; | |
1528 | ||
145b3fe5 | 1529 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1530 | pdev->vendor, pdev->device, |
1531 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1532 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1533 | (u8)(pdev->class))) | |
1534 | return -ENOMEM; | |
efdd4070 | 1535 | |
8ccc9aa1 BP |
1536 | return 0; |
1537 | } | |
1538 | ||
3ecac020 ME |
1539 | #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH) |
1540 | /** | |
1541 | * pci_uevent_ers - emit a uevent during recovery path of PCI device | |
1542 | * @pdev: PCI device undergoing error recovery | |
1543 | * @err_type: type of error event | |
1544 | */ | |
1545 | void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type) | |
1546 | { | |
1547 | int idx = 0; | |
1548 | char *envp[3]; | |
1549 | ||
1550 | switch (err_type) { | |
1551 | case PCI_ERS_RESULT_NONE: | |
1552 | case PCI_ERS_RESULT_CAN_RECOVER: | |
1553 | envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY"; | |
1554 | envp[idx++] = "DEVICE_ONLINE=0"; | |
1555 | break; | |
1556 | case PCI_ERS_RESULT_RECOVERED: | |
1557 | envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY"; | |
1558 | envp[idx++] = "DEVICE_ONLINE=1"; | |
1559 | break; | |
1560 | case PCI_ERS_RESULT_DISCONNECT: | |
1561 | envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY"; | |
1562 | envp[idx++] = "DEVICE_ONLINE=0"; | |
1563 | break; | |
1564 | default: | |
1565 | break; | |
1566 | } | |
1567 | ||
1568 | if (idx > 0) { | |
1569 | envp[idx++] = NULL; | |
1570 | kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp); | |
1571 | } | |
1572 | } | |
1573 | #endif | |
1574 | ||
02e0bea6 PS |
1575 | static int pci_bus_num_vf(struct device *dev) |
1576 | { | |
1577 | return pci_num_vf(to_pci_dev(dev)); | |
1578 | } | |
1579 | ||
1da177e4 LT |
1580 | struct bus_type pci_bus_type = { |
1581 | .name = "pci", | |
1582 | .match = pci_bus_match, | |
312c004d | 1583 | .uevent = pci_uevent, |
b15d686a RK |
1584 | .probe = pci_device_probe, |
1585 | .remove = pci_device_remove, | |
cbd69dbb | 1586 | .shutdown = pci_device_shutdown, |
5136b2da | 1587 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1588 | .bus_groups = pci_bus_groups, |
2229c1fb | 1589 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1590 | .pm = PCI_PM_OPS_PTR, |
02e0bea6 | 1591 | .num_vf = pci_bus_num_vf, |
d89e2378 | 1592 | .force_dma = true, |
1da177e4 | 1593 | }; |
b7fe9434 | 1594 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 | 1595 | |
c6c889d9 BH |
1596 | #ifdef CONFIG_PCIEPORTBUS |
1597 | static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) | |
1598 | { | |
1599 | struct pcie_device *pciedev; | |
1600 | struct pcie_port_service_driver *driver; | |
1601 | ||
1602 | if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) | |
1603 | return 0; | |
1604 | ||
1605 | pciedev = to_pcie_device(dev); | |
1606 | driver = to_service_driver(drv); | |
1607 | ||
1608 | if (driver->service != pciedev->service) | |
1609 | return 0; | |
1610 | ||
1611 | if (driver->port_type != PCIE_ANY_PORT && | |
1612 | driver->port_type != pci_pcie_type(pciedev->port)) | |
1613 | return 0; | |
1614 | ||
1615 | return 1; | |
1616 | } | |
1617 | ||
1618 | struct bus_type pcie_port_bus_type = { | |
1619 | .name = "pci_express", | |
1620 | .match = pcie_port_bus_match, | |
1621 | }; | |
1622 | EXPORT_SYMBOL_GPL(pcie_port_bus_type); | |
1623 | #endif | |
1624 | ||
1da177e4 LT |
1625 | static int __init pci_driver_init(void) |
1626 | { | |
c6c889d9 BH |
1627 | int ret; |
1628 | ||
1629 | ret = bus_register(&pci_bus_type); | |
1630 | if (ret) | |
1631 | return ret; | |
1632 | ||
1633 | #ifdef CONFIG_PCIEPORTBUS | |
1634 | ret = bus_register(&pcie_port_bus_type); | |
1635 | if (ret) | |
1636 | return ret; | |
1637 | #endif | |
1638 | ||
1639 | return 0; | |
1da177e4 | 1640 | } |
1da177e4 | 1641 | postcore_initcall(pci_driver_init); |