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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> |
07397df2 NG |
19 | #include <linux/of_device.h> |
20 | #include <linux/acpi.h> | |
1da177e4 | 21 | #include "pci.h" |
c6c889d9 | 22 | #include "pcie/portdrv.h" |
1da177e4 | 23 | |
75865858 GKH |
24 | struct pci_dynid { |
25 | struct list_head node; | |
26 | struct pci_device_id id; | |
27 | }; | |
1da177e4 | 28 | |
9dba910e TH |
29 | /** |
30 | * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices | |
31 | * @drv: target pci driver | |
32 | * @vendor: PCI vendor ID | |
33 | * @device: PCI device ID | |
34 | * @subvendor: PCI subvendor ID | |
35 | * @subdevice: PCI subdevice ID | |
36 | * @class: PCI class | |
37 | * @class_mask: PCI class mask | |
38 | * @driver_data: private driver data | |
39 | * | |
40 | * Adds a new dynamic pci device ID to this driver and causes the | |
41 | * driver to probe for all devices again. @drv must have been | |
42 | * registered prior to calling this function. | |
43 | * | |
44 | * CONTEXT: | |
45 | * Does GFP_KERNEL allocation. | |
46 | * | |
47 | * RETURNS: | |
48 | * 0 on success, -errno on failure. | |
49 | */ | |
50 | int pci_add_dynid(struct pci_driver *drv, | |
51 | unsigned int vendor, unsigned int device, | |
52 | unsigned int subvendor, unsigned int subdevice, | |
53 | unsigned int class, unsigned int class_mask, | |
54 | unsigned long driver_data) | |
55 | { | |
56 | struct pci_dynid *dynid; | |
9dba910e TH |
57 | |
58 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
59 | if (!dynid) | |
60 | return -ENOMEM; | |
61 | ||
62 | dynid->id.vendor = vendor; | |
63 | dynid->id.device = device; | |
64 | dynid->id.subvendor = subvendor; | |
65 | dynid->id.subdevice = subdevice; | |
66 | dynid->id.class = class; | |
67 | dynid->id.class_mask = class_mask; | |
68 | dynid->id.driver_data = driver_data; | |
3d3c2ae1 | 69 | |
9dba910e TH |
70 | spin_lock(&drv->dynids.lock); |
71 | list_add_tail(&dynid->node, &drv->dynids.list); | |
72 | spin_unlock(&drv->dynids.lock); | |
73 | ||
3b7f1016 | 74 | return driver_attach(&drv->driver); |
9dba910e | 75 | } |
b7fe9434 | 76 | EXPORT_SYMBOL_GPL(pci_add_dynid); |
9dba910e TH |
77 | |
78 | static void pci_free_dynids(struct pci_driver *drv) | |
79 | { | |
80 | struct pci_dynid *dynid, *n; | |
3d3c2ae1 | 81 | |
9dba910e TH |
82 | spin_lock(&drv->dynids.lock); |
83 | list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) { | |
84 | list_del(&dynid->node); | |
85 | kfree(dynid); | |
86 | } | |
87 | spin_unlock(&drv->dynids.lock); | |
88 | } | |
89 | ||
1da177e4 | 90 | /** |
9dba910e | 91 | * store_new_id - sysfs frontend to pci_add_dynid() |
8f7020d3 RD |
92 | * @driver: target device driver |
93 | * @buf: buffer for scanning device ID data | |
94 | * @count: input size | |
1da177e4 | 95 | * |
9dba910e | 96 | * Allow PCI IDs to be added to an existing driver via sysfs. |
1da177e4 | 97 | */ |
a9427741 | 98 | static ssize_t new_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 99 | size_t count) |
1da177e4 | 100 | { |
1da177e4 | 101 | struct pci_driver *pdrv = to_pci_driver(driver); |
b41d6cf3 | 102 | const struct pci_device_id *ids = pdrv->id_table; |
3c78bc61 RD |
103 | __u32 vendor, device, subvendor = PCI_ANY_ID, |
104 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
105 | unsigned long driver_data = 0; | |
106 | int fields = 0; | |
8895d3bc | 107 | int retval = 0; |
1da177e4 | 108 | |
b41d6cf3 | 109 | fields = sscanf(buf, "%x %x %x %x %x %x %lx", |
1da177e4 LT |
110 | &vendor, &device, &subvendor, &subdevice, |
111 | &class, &class_mask, &driver_data); | |
6ba18636 | 112 | if (fields < 2) |
1da177e4 LT |
113 | return -EINVAL; |
114 | ||
8895d3bc BD |
115 | if (fields != 7) { |
116 | struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL); | |
117 | if (!pdev) | |
118 | return -ENOMEM; | |
119 | ||
120 | pdev->vendor = vendor; | |
121 | pdev->device = device; | |
122 | pdev->subsystem_vendor = subvendor; | |
123 | pdev->subsystem_device = subdevice; | |
124 | pdev->class = class; | |
125 | ||
126 | if (pci_match_id(pdrv->id_table, pdev)) | |
127 | retval = -EEXIST; | |
128 | ||
129 | kfree(pdev); | |
130 | ||
131 | if (retval) | |
132 | return retval; | |
133 | } | |
134 | ||
b41d6cf3 JD |
135 | /* Only accept driver_data values that match an existing id_table |
136 | entry */ | |
2debb4d2 CW |
137 | if (ids) { |
138 | retval = -EINVAL; | |
139 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
140 | if (driver_data == ids->driver_data) { | |
141 | retval = 0; | |
142 | break; | |
143 | } | |
144 | ids++; | |
b41d6cf3 | 145 | } |
2debb4d2 CW |
146 | if (retval) /* No match */ |
147 | return retval; | |
b41d6cf3 | 148 | } |
b41d6cf3 | 149 | |
9dba910e TH |
150 | retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice, |
151 | class, class_mask, driver_data); | |
b19441af GKH |
152 | if (retval) |
153 | return retval; | |
1da177e4 LT |
154 | return count; |
155 | } | |
a9427741 | 156 | static DRIVER_ATTR_WO(new_id); |
1da177e4 | 157 | |
0994375e CW |
158 | /** |
159 | * store_remove_id - remove a PCI device ID from this driver | |
160 | * @driver: target device driver | |
161 | * @buf: buffer for scanning device ID data | |
162 | * @count: input size | |
163 | * | |
164 | * Removes a dynamic pci device ID to this driver. | |
165 | */ | |
a9427741 | 166 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, |
3c78bc61 | 167 | size_t count) |
0994375e CW |
168 | { |
169 | struct pci_dynid *dynid, *n; | |
170 | struct pci_driver *pdrv = to_pci_driver(driver); | |
171 | __u32 vendor, device, subvendor = PCI_ANY_ID, | |
172 | subdevice = PCI_ANY_ID, class = 0, class_mask = 0; | |
173 | int fields = 0; | |
9222097f | 174 | size_t retval = -ENODEV; |
0994375e CW |
175 | |
176 | fields = sscanf(buf, "%x %x %x %x %x %x", | |
177 | &vendor, &device, &subvendor, &subdevice, | |
178 | &class, &class_mask); | |
179 | if (fields < 2) | |
180 | return -EINVAL; | |
181 | ||
182 | spin_lock(&pdrv->dynids.lock); | |
183 | list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) { | |
184 | struct pci_device_id *id = &dynid->id; | |
185 | if ((id->vendor == vendor) && | |
186 | (id->device == device) && | |
187 | (subvendor == PCI_ANY_ID || id->subvendor == subvendor) && | |
188 | (subdevice == PCI_ANY_ID || id->subdevice == subdevice) && | |
189 | !((id->class ^ class) & class_mask)) { | |
190 | list_del(&dynid->node); | |
191 | kfree(dynid); | |
9222097f | 192 | retval = count; |
0994375e CW |
193 | break; |
194 | } | |
195 | } | |
196 | spin_unlock(&pdrv->dynids.lock); | |
197 | ||
9222097f | 198 | return retval; |
0994375e | 199 | } |
a9427741 | 200 | static DRIVER_ATTR_WO(remove_id); |
0994375e | 201 | |
2229c1fb GKH |
202 | static struct attribute *pci_drv_attrs[] = { |
203 | &driver_attr_new_id.attr, | |
204 | &driver_attr_remove_id.attr, | |
205 | NULL, | |
bfb09a86 | 206 | }; |
2229c1fb | 207 | ATTRIBUTE_GROUPS(pci_drv); |
0994375e | 208 | |
1da177e4 | 209 | /** |
75865858 | 210 | * pci_match_id - See if a pci device matches a given pci_id table |
1da177e4 | 211 | * @ids: array of PCI device id structures to search in |
75865858 GKH |
212 | * @dev: the PCI device structure to match against. |
213 | * | |
1da177e4 | 214 | * Used by a driver to check whether a PCI device present in the |
75865858 | 215 | * system is in its list of supported devices. Returns the matching |
1da177e4 | 216 | * pci_device_id structure or %NULL if there is no match. |
75865858 | 217 | * |
8b60756a | 218 | * Deprecated, don't use this as it will not catch any dynamic ids |
75865858 | 219 | * that a driver might want to check for. |
1da177e4 | 220 | */ |
75865858 GKH |
221 | const struct pci_device_id *pci_match_id(const struct pci_device_id *ids, |
222 | struct pci_dev *dev) | |
1da177e4 | 223 | { |
75865858 GKH |
224 | if (ids) { |
225 | while (ids->vendor || ids->subvendor || ids->class_mask) { | |
226 | if (pci_match_one_device(ids, dev)) | |
227 | return ids; | |
228 | ids++; | |
229 | } | |
1da177e4 LT |
230 | } |
231 | return NULL; | |
232 | } | |
b7fe9434 | 233 | EXPORT_SYMBOL(pci_match_id); |
1da177e4 | 234 | |
782a985d AW |
235 | static const struct pci_device_id pci_device_id_any = { |
236 | .vendor = PCI_ANY_ID, | |
237 | .device = PCI_ANY_ID, | |
238 | .subvendor = PCI_ANY_ID, | |
239 | .subdevice = PCI_ANY_ID, | |
240 | }; | |
241 | ||
1da177e4 | 242 | /** |
ae9608af | 243 | * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure |
75865858 | 244 | * @drv: the PCI driver to match against |
39ba487f | 245 | * @dev: the PCI device structure to match against |
75865858 GKH |
246 | * |
247 | * Used by a driver to check whether a PCI device present in the | |
248 | * system is in its list of supported devices. Returns the matching | |
249 | * pci_device_id structure or %NULL if there is no match. | |
1da177e4 | 250 | */ |
d73460d7 AB |
251 | static const struct pci_device_id *pci_match_device(struct pci_driver *drv, |
252 | struct pci_dev *dev) | |
75865858 | 253 | { |
75865858 | 254 | struct pci_dynid *dynid; |
782a985d AW |
255 | const struct pci_device_id *found_id = NULL; |
256 | ||
257 | /* When driver_override is set, only bind to the matching driver */ | |
258 | if (dev->driver_override && strcmp(dev->driver_override, drv->name)) | |
259 | return NULL; | |
1da177e4 | 260 | |
7461b60a | 261 | /* Look at the dynamic ids first, before the static ones */ |
75865858 GKH |
262 | spin_lock(&drv->dynids.lock); |
263 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
264 | if (pci_match_one_device(&dynid->id, dev)) { | |
782a985d AW |
265 | found_id = &dynid->id; |
266 | break; | |
75865858 | 267 | } |
1da177e4 | 268 | } |
75865858 | 269 | spin_unlock(&drv->dynids.lock); |
7461b60a | 270 | |
782a985d AW |
271 | if (!found_id) |
272 | found_id = pci_match_id(drv->id_table, dev); | |
273 | ||
274 | /* driver_override will always match, send a dummy id */ | |
275 | if (!found_id && dev->driver_override) | |
276 | found_id = &pci_device_id_any; | |
277 | ||
278 | return found_id; | |
1da177e4 LT |
279 | } |
280 | ||
873392ca RR |
281 | struct drv_dev_and_id { |
282 | struct pci_driver *drv; | |
283 | struct pci_dev *dev; | |
284 | const struct pci_device_id *id; | |
285 | }; | |
286 | ||
287 | static long local_pci_probe(void *_ddi) | |
288 | { | |
289 | struct drv_dev_and_id *ddi = _ddi; | |
967577b0 HY |
290 | struct pci_dev *pci_dev = ddi->dev; |
291 | struct pci_driver *pci_drv = ddi->drv; | |
292 | struct device *dev = &pci_dev->dev; | |
f3ec4f87 AS |
293 | int rc; |
294 | ||
967577b0 HY |
295 | /* |
296 | * Unbound PCI devices are always put in D0, regardless of | |
297 | * runtime PM status. During probe, the device is set to | |
298 | * active and the usage count is incremented. If the driver | |
a8360062 RW |
299 | * supports runtime PM, it should call pm_runtime_put_noidle(), |
300 | * or any other runtime PM helper function decrementing the usage | |
301 | * count, in its probe routine and pm_runtime_get_noresume() in | |
302 | * its remove routine. | |
f3ec4f87 | 303 | */ |
967577b0 HY |
304 | pm_runtime_get_sync(dev); |
305 | pci_dev->driver = pci_drv; | |
306 | rc = pci_drv->probe(pci_dev, ddi->id); | |
f92d74c1 SC |
307 | if (!rc) |
308 | return rc; | |
309 | if (rc < 0) { | |
967577b0 HY |
310 | pci_dev->driver = NULL; |
311 | pm_runtime_put_sync(dev); | |
f92d74c1 | 312 | return rc; |
f3ec4f87 | 313 | } |
f92d74c1 SC |
314 | /* |
315 | * Probe function should return < 0 for failure, 0 for success | |
316 | * Treat values > 0 as success, but warn. | |
317 | */ | |
318 | dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc); | |
319 | return 0; | |
873392ca RR |
320 | } |
321 | ||
0b2c2a71 TG |
322 | static bool pci_physfn_is_probed(struct pci_dev *dev) |
323 | { | |
324 | #ifdef CONFIG_PCI_IOV | |
325 | return dev->is_virtfn && dev->physfn->is_probed; | |
326 | #else | |
327 | return false; | |
328 | #endif | |
329 | } | |
330 | ||
d42c6997 AK |
331 | static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev, |
332 | const struct pci_device_id *id) | |
333 | { | |
0b2c2a71 | 334 | int error, node, cpu; |
873392ca RR |
335 | struct drv_dev_and_id ddi = { drv, dev, id }; |
336 | ||
12c3156f AD |
337 | /* |
338 | * Execute driver initialization on node where the device is | |
339 | * attached. This way the driver likely allocates its local memory | |
340 | * on the right node. | |
341 | */ | |
873392ca | 342 | node = dev_to_node(&dev->dev); |
0b2c2a71 TG |
343 | dev->is_probed = 1; |
344 | ||
345 | cpu_hotplug_disable(); | |
12c3156f AD |
346 | |
347 | /* | |
0b2c2a71 TG |
348 | * Prevent nesting work_on_cpu() for the case where a Virtual Function |
349 | * device is probed from work_on_cpu() of the Physical device. | |
12c3156f | 350 | */ |
0b2c2a71 TG |
351 | if (node < 0 || node >= MAX_NUMNODES || !node_online(node) || |
352 | pci_physfn_is_probed(dev)) | |
353 | cpu = nr_cpu_ids; | |
354 | else | |
a70f7302 | 355 | cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask); |
0b2c2a71 TG |
356 | |
357 | if (cpu < nr_cpu_ids) | |
358 | error = work_on_cpu(cpu, local_pci_probe, &ddi); | |
359 | else | |
873392ca | 360 | error = local_pci_probe(&ddi); |
12c3156f | 361 | |
0b2c2a71 TG |
362 | dev->is_probed = 0; |
363 | cpu_hotplug_enable(); | |
d42c6997 AK |
364 | return error; |
365 | } | |
366 | ||
1da177e4 | 367 | /** |
23ea3793 | 368 | * __pci_device_probe - check if a driver wants to claim a specific PCI device |
8f7020d3 RD |
369 | * @drv: driver to call to check if it wants the PCI device |
370 | * @pci_dev: PCI device being probed | |
f7625980 | 371 | * |
8f7020d3 | 372 | * returns 0 on success, else error. |
1da177e4 LT |
373 | * side-effect: pci_dev->driver is set to drv when drv claims pci_dev. |
374 | */ | |
3c78bc61 | 375 | static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev) |
75865858 GKH |
376 | { |
377 | const struct pci_device_id *id; | |
1da177e4 LT |
378 | int error = 0; |
379 | ||
380 | if (!pci_dev->driver && drv->probe) { | |
75865858 GKH |
381 | error = -ENODEV; |
382 | ||
383 | id = pci_match_device(drv, pci_dev); | |
384 | if (id) | |
d42c6997 | 385 | error = pci_call_probe(drv, pci_dev, id); |
1da177e4 LT |
386 | } |
387 | return error; | |
388 | } | |
389 | ||
890e4847 JL |
390 | int __weak pcibios_alloc_irq(struct pci_dev *dev) |
391 | { | |
392 | return 0; | |
393 | } | |
394 | ||
395 | void __weak pcibios_free_irq(struct pci_dev *dev) | |
396 | { | |
397 | } | |
398 | ||
0e7df224 BW |
399 | #ifdef CONFIG_PCI_IOV |
400 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
401 | { | |
402 | return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe); | |
403 | } | |
404 | #else | |
405 | static inline bool pci_device_can_probe(struct pci_dev *pdev) | |
406 | { | |
407 | return true; | |
408 | } | |
409 | #endif | |
410 | ||
3c78bc61 | 411 | static int pci_device_probe(struct device *dev) |
1da177e4 | 412 | { |
890e4847 JL |
413 | int error; |
414 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
415 | struct pci_driver *drv = to_pci_driver(dev->driver); | |
416 | ||
30fdfb92 MM |
417 | pci_assign_irq(pci_dev); |
418 | ||
890e4847 JL |
419 | error = pcibios_alloc_irq(pci_dev); |
420 | if (error < 0) | |
421 | return error; | |
1da177e4 | 422 | |
1da177e4 | 423 | pci_dev_get(pci_dev); |
0e7df224 BW |
424 | if (pci_device_can_probe(pci_dev)) { |
425 | error = __pci_device_probe(drv, pci_dev); | |
426 | if (error) { | |
427 | pcibios_free_irq(pci_dev); | |
428 | pci_dev_put(pci_dev); | |
429 | } | |
890e4847 | 430 | } |
1da177e4 LT |
431 | |
432 | return error; | |
433 | } | |
434 | ||
3c78bc61 | 435 | static int pci_device_remove(struct device *dev) |
1da177e4 | 436 | { |
3c78bc61 RD |
437 | struct pci_dev *pci_dev = to_pci_dev(dev); |
438 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 LT |
439 | |
440 | if (drv) { | |
f3ec4f87 AS |
441 | if (drv->remove) { |
442 | pm_runtime_get_sync(dev); | |
1da177e4 | 443 | drv->remove(pci_dev); |
f3ec4f87 AS |
444 | pm_runtime_put_noidle(dev); |
445 | } | |
890e4847 | 446 | pcibios_free_irq(pci_dev); |
1da177e4 LT |
447 | pci_dev->driver = NULL; |
448 | } | |
449 | ||
f3ec4f87 | 450 | /* Undo the runtime PM settings in local_pci_probe() */ |
967577b0 | 451 | pm_runtime_put_sync(dev); |
f3ec4f87 | 452 | |
2449e06a SL |
453 | /* |
454 | * If the device is still on, set the power state as "unknown", | |
455 | * since it might change by the next time we load the driver. | |
456 | */ | |
457 | if (pci_dev->current_state == PCI_D0) | |
458 | pci_dev->current_state = PCI_UNKNOWN; | |
459 | ||
1da177e4 LT |
460 | /* |
461 | * We would love to complain here if pci_dev->is_enabled is set, that | |
462 | * the driver should have called pci_disable_device(), but the | |
463 | * unfortunate fact is there are too many odd BIOS and bridge setups | |
f7625980 | 464 | * that don't like drivers doing that all of the time. |
1da177e4 LT |
465 | * Oh well, we can dream of sane hardware when we sleep, no matter how |
466 | * horrible the crap we have to deal with is when we are awake... | |
467 | */ | |
468 | ||
469 | pci_dev_put(pci_dev); | |
470 | return 0; | |
471 | } | |
472 | ||
bbb44d9f RW |
473 | static void pci_device_shutdown(struct device *dev) |
474 | { | |
475 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
476 | struct pci_driver *drv = pci_dev->driver; | |
477 | ||
3ff2de9b HY |
478 | pm_runtime_resume(dev); |
479 | ||
bbb44d9f RW |
480 | if (drv && drv->shutdown) |
481 | drv->shutdown(pci_dev); | |
5b415f1e | 482 | |
b566a22c | 483 | /* |
4fc9bbf9 KA |
484 | * If this is a kexec reboot, turn off Bus Master bit on the |
485 | * device to tell it to not continue to do DMA. Don't touch | |
486 | * devices in D3cold or unknown states. | |
487 | * If it is not a kexec reboot, firmware will hit the PCI | |
488 | * devices with big hammer and stop their DMA any way. | |
b566a22c | 489 | */ |
4fc9bbf9 | 490 | if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) |
6e0eda3c | 491 | pci_clear_master(pci_dev); |
bbb44d9f RW |
492 | } |
493 | ||
aa338601 | 494 | #ifdef CONFIG_PM |
6cbf8214 RW |
495 | |
496 | /* Auxiliary functions used for system resume and run-time resume. */ | |
497 | ||
498 | /** | |
499 | * pci_restore_standard_config - restore standard config registers of PCI device | |
500 | * @pci_dev: PCI device to handle | |
501 | */ | |
502 | static int pci_restore_standard_config(struct pci_dev *pci_dev) | |
503 | { | |
504 | pci_update_current_state(pci_dev, PCI_UNKNOWN); | |
505 | ||
506 | if (pci_dev->current_state != PCI_D0) { | |
507 | int error = pci_set_power_state(pci_dev, PCI_D0); | |
508 | if (error) | |
509 | return error; | |
510 | } | |
511 | ||
1d3c16a8 | 512 | pci_restore_state(pci_dev); |
0ce3fcaf | 513 | pci_pme_restore(pci_dev); |
1d3c16a8 | 514 | return 0; |
6cbf8214 RW |
515 | } |
516 | ||
db288c9c RW |
517 | #endif |
518 | ||
519 | #ifdef CONFIG_PM_SLEEP | |
520 | ||
6cbf8214 RW |
521 | static void pci_pm_default_resume_early(struct pci_dev *pci_dev) |
522 | { | |
db288c9c RW |
523 | pci_power_up(pci_dev); |
524 | pci_restore_state(pci_dev); | |
0ce3fcaf | 525 | pci_pme_restore(pci_dev); |
6cbf8214 RW |
526 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
527 | } | |
528 | ||
fa58d305 RW |
529 | /* |
530 | * Default "suspend" method for devices that have no driver provided suspend, | |
531 | * or not even a driver at all (second part). | |
bbb44d9f | 532 | */ |
bb808945 | 533 | static void pci_pm_set_unknown_state(struct pci_dev *pci_dev) |
bbb44d9f | 534 | { |
bbb44d9f RW |
535 | /* |
536 | * mark its power state as "unknown", since we don't know if | |
537 | * e.g. the BIOS will change its device state when we suspend. | |
538 | */ | |
539 | if (pci_dev->current_state == PCI_D0) | |
540 | pci_dev->current_state = PCI_UNKNOWN; | |
541 | } | |
542 | ||
355a72d7 RW |
543 | /* |
544 | * Default "resume" method for devices that have no driver provided resume, | |
545 | * or not even a driver at all (second part). | |
546 | */ | |
bb808945 | 547 | static int pci_pm_reenable_device(struct pci_dev *pci_dev) |
355a72d7 RW |
548 | { |
549 | int retval; | |
550 | ||
bbb44d9f RW |
551 | /* if the device was enabled before suspend, reenable */ |
552 | retval = pci_reenable_device(pci_dev); | |
553 | /* | |
554 | * if the device was busmaster before the suspend, make it busmaster | |
555 | * again | |
556 | */ | |
557 | if (pci_dev->is_busmaster) | |
558 | pci_set_master(pci_dev); | |
559 | ||
560 | return retval; | |
561 | } | |
562 | ||
563 | static int pci_legacy_suspend(struct device *dev, pm_message_t state) | |
1da177e4 | 564 | { |
3c78bc61 RD |
565 | struct pci_dev *pci_dev = to_pci_dev(dev); |
566 | struct pci_driver *drv = pci_dev->driver; | |
46939f8b | 567 | |
02669492 | 568 | if (drv && drv->suspend) { |
99dadce8 | 569 | pci_power_t prev = pci_dev->current_state; |
46939f8b | 570 | int error; |
aa8c6c93 | 571 | |
57ef8026 FP |
572 | error = drv->suspend(pci_dev, state); |
573 | suspend_report_result(drv->suspend, error); | |
574 | if (error) | |
575 | return error; | |
aa8c6c93 | 576 | |
46939f8b | 577 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
99dadce8 RW |
578 | && pci_dev->current_state != PCI_UNKNOWN) { |
579 | WARN_ONCE(pci_dev->current_state != prev, | |
580 | "PCI PM: Device state not saved by %pF\n", | |
581 | drv->suspend); | |
99dadce8 | 582 | } |
02669492 | 583 | } |
ad8cfa1d RW |
584 | |
585 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
586 | ||
46939f8b | 587 | return 0; |
1da177e4 LT |
588 | } |
589 | ||
bbb44d9f | 590 | static int pci_legacy_suspend_late(struct device *dev, pm_message_t state) |
cbd69dbb | 591 | { |
3c78bc61 RD |
592 | struct pci_dev *pci_dev = to_pci_dev(dev); |
593 | struct pci_driver *drv = pci_dev->driver; | |
cbd69dbb LT |
594 | |
595 | if (drv && drv->suspend_late) { | |
46939f8b RW |
596 | pci_power_t prev = pci_dev->current_state; |
597 | int error; | |
598 | ||
57ef8026 FP |
599 | error = drv->suspend_late(pci_dev, state); |
600 | suspend_report_result(drv->suspend_late, error); | |
46939f8b RW |
601 | if (error) |
602 | return error; | |
603 | ||
604 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
605 | && pci_dev->current_state != PCI_UNKNOWN) { | |
606 | WARN_ONCE(pci_dev->current_state != prev, | |
607 | "PCI PM: Device state not saved by %pF\n", | |
608 | drv->suspend_late); | |
7d2a01b8 | 609 | goto Fixup; |
46939f8b | 610 | } |
cbd69dbb | 611 | } |
46939f8b RW |
612 | |
613 | if (!pci_dev->state_saved) | |
614 | pci_save_state(pci_dev); | |
615 | ||
616 | pci_pm_set_unknown_state(pci_dev); | |
617 | ||
7d2a01b8 AN |
618 | Fixup: |
619 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
620 | ||
46939f8b | 621 | return 0; |
cbd69dbb | 622 | } |
1da177e4 | 623 | |
f6dc1e5e RW |
624 | static int pci_legacy_resume_early(struct device *dev) |
625 | { | |
3c78bc61 RD |
626 | struct pci_dev *pci_dev = to_pci_dev(dev); |
627 | struct pci_driver *drv = pci_dev->driver; | |
f6dc1e5e | 628 | |
aa8c6c93 RW |
629 | return drv && drv->resume_early ? |
630 | drv->resume_early(pci_dev) : 0; | |
f6dc1e5e RW |
631 | } |
632 | ||
bbb44d9f | 633 | static int pci_legacy_resume(struct device *dev) |
1da177e4 | 634 | { |
3c78bc61 RD |
635 | struct pci_dev *pci_dev = to_pci_dev(dev); |
636 | struct pci_driver *drv = pci_dev->driver; | |
1da177e4 | 637 | |
ad8cfa1d RW |
638 | pci_fixup_device(pci_fixup_resume, pci_dev); |
639 | ||
aa8c6c93 RW |
640 | return drv && drv->resume ? |
641 | drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev); | |
1da177e4 LT |
642 | } |
643 | ||
571ff758 RW |
644 | /* Auxiliary functions used by the new power management framework */ |
645 | ||
5294e256 | 646 | static void pci_pm_default_resume(struct pci_dev *pci_dev) |
571ff758 | 647 | { |
73410429 | 648 | pci_fixup_device(pci_fixup_resume, pci_dev); |
baecc470 | 649 | pci_enable_wake(pci_dev, PCI_D0, false); |
571ff758 RW |
650 | } |
651 | ||
5294e256 | 652 | static void pci_pm_default_suspend(struct pci_dev *pci_dev) |
73410429 | 653 | { |
5294e256 | 654 | /* Disable non-bridge devices without PM support */ |
326c1cda | 655 | if (!pci_has_subordinate(pci_dev)) |
cbbc2f6b | 656 | pci_disable_enabled_device(pci_dev); |
73410429 RW |
657 | } |
658 | ||
07e836e8 RW |
659 | static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev) |
660 | { | |
661 | struct pci_driver *drv = pci_dev->driver; | |
bb808945 | 662 | bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume |
07e836e8 | 663 | || drv->resume_early); |
bb808945 RW |
664 | |
665 | /* | |
666 | * Legacy PM support is used by default, so warn if the new framework is | |
667 | * supported as well. Drivers are supposed to support either the | |
668 | * former, or the latter, but not both at the same time. | |
669 | */ | |
82440a82 DF |
670 | WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n", |
671 | drv->name, pci_dev->vendor, pci_dev->device); | |
bb808945 RW |
672 | |
673 | return ret; | |
07e836e8 RW |
674 | } |
675 | ||
571ff758 RW |
676 | /* New power management framework */ |
677 | ||
bbb44d9f RW |
678 | static int pci_pm_prepare(struct device *dev) |
679 | { | |
680 | struct device_driver *drv = dev->driver; | |
bbb44d9f | 681 | |
bac2a909 RW |
682 | if (drv && drv->pm && drv->pm->prepare) { |
683 | int error = drv->pm->prepare(dev); | |
08810a41 | 684 | if (error < 0) |
bac2a909 | 685 | return error; |
08810a41 RW |
686 | |
687 | if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE)) | |
688 | return 0; | |
bac2a909 RW |
689 | } |
690 | return pci_dev_keep_suspended(to_pci_dev(dev)); | |
bbb44d9f RW |
691 | } |
692 | ||
2cef548a RW |
693 | static void pci_pm_complete(struct device *dev) |
694 | { | |
a0d2a959 LW |
695 | struct pci_dev *pci_dev = to_pci_dev(dev); |
696 | ||
697 | pci_dev_complete_resume(pci_dev); | |
698 | pm_generic_complete(dev); | |
699 | ||
700 | /* Resume device if platform firmware has put it in reset-power-on */ | |
bd755d77 | 701 | if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) { |
a0d2a959 LW |
702 | pci_power_t pre_sleep_state = pci_dev->current_state; |
703 | ||
704 | pci_update_current_state(pci_dev, pci_dev->current_state); | |
705 | if (pci_dev->current_state < pre_sleep_state) | |
706 | pm_request_resume(dev); | |
707 | } | |
2cef548a | 708 | } |
bbb44d9f | 709 | |
6cbf8214 RW |
710 | #else /* !CONFIG_PM_SLEEP */ |
711 | ||
712 | #define pci_pm_prepare NULL | |
2cef548a | 713 | #define pci_pm_complete NULL |
6cbf8214 RW |
714 | |
715 | #endif /* !CONFIG_PM_SLEEP */ | |
716 | ||
bbb44d9f | 717 | #ifdef CONFIG_SUSPEND |
a39bd851 BH |
718 | static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev) |
719 | { | |
720 | /* | |
721 | * Some BIOSes forget to clear Root PME Status bits after system | |
722 | * wakeup, which breaks ACPI-based runtime wakeup on PCI Express. | |
723 | * Clear those bits now just in case (shouldn't hurt). | |
724 | */ | |
725 | if (pci_is_pcie(pci_dev) && | |
3620c714 BH |
726 | (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT || |
727 | pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC)) | |
a39bd851 BH |
728 | pcie_clear_root_pme_status(pci_dev); |
729 | } | |
bbb44d9f RW |
730 | |
731 | static int pci_pm_suspend(struct device *dev) | |
732 | { | |
733 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 734 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 735 | |
ad8cfa1d RW |
736 | if (pci_has_legacy_pm_support(pci_dev)) |
737 | return pci_legacy_suspend(dev, PMSG_SUSPEND); | |
bb808945 | 738 | |
5294e256 RW |
739 | if (!pm) { |
740 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 741 | return 0; |
5294e256 RW |
742 | } |
743 | ||
7cd0602d | 744 | /* |
c4b65157 RW |
745 | * PCI devices suspended at run time may need to be resumed at this |
746 | * point, because in general it may be necessary to reconfigure them for | |
747 | * system suspend. Namely, if the device is expected to wake up the | |
748 | * system from the sleep state, it may have to be reconfigured for this | |
749 | * purpose, or if the device is not expected to wake up the system from | |
750 | * the sleep state, it should be prevented from signaling wakeup events | |
751 | * going forward. | |
752 | * | |
753 | * Also if the driver of the device does not indicate that its system | |
754 | * suspend callbacks can cope with runtime-suspended devices, it is | |
755 | * better to resume the device from runtime suspend here. | |
7cd0602d | 756 | */ |
c4b65157 | 757 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
656088aa | 758 | !pci_dev_keep_suspended(pci_dev)) { |
c4b65157 | 759 | pm_runtime_resume(dev); |
656088aa RW |
760 | pci_dev->state_saved = false; |
761 | } | |
7cd0602d | 762 | |
5294e256 RW |
763 | if (pm->suspend) { |
764 | pci_power_t prev = pci_dev->current_state; | |
765 | int error; | |
766 | ||
ddb7c9d2 RW |
767 | error = pm->suspend(dev); |
768 | suspend_report_result(pm->suspend, error); | |
5294e256 RW |
769 | if (error) |
770 | return error; | |
771 | ||
46939f8b | 772 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 |
5294e256 RW |
773 | && pci_dev->current_state != PCI_UNKNOWN) { |
774 | WARN_ONCE(pci_dev->current_state != prev, | |
775 | "PCI PM: State of device not saved by %pF\n", | |
776 | pm->suspend); | |
5294e256 | 777 | } |
bbb44d9f | 778 | } |
fa58d305 | 779 | |
5294e256 | 780 | return 0; |
bbb44d9f RW |
781 | } |
782 | ||
c4b65157 RW |
783 | static int pci_pm_suspend_late(struct device *dev) |
784 | { | |
785 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
786 | return 0; | |
787 | ||
788 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); | |
789 | ||
790 | return pm_generic_suspend_late(dev); | |
791 | } | |
792 | ||
bbb44d9f | 793 | static int pci_pm_suspend_noirq(struct device *dev) |
c8958177 | 794 | { |
355a72d7 | 795 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 796 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
c8958177 | 797 | |
bd755d77 RW |
798 | if (dev_pm_smart_suspend_and_suspended(dev)) { |
799 | dev->power.may_skip_resume = true; | |
c4b65157 | 800 | return 0; |
bd755d77 | 801 | } |
c4b65157 | 802 | |
bb808945 RW |
803 | if (pci_has_legacy_pm_support(pci_dev)) |
804 | return pci_legacy_suspend_late(dev, PMSG_SUSPEND); | |
805 | ||
931ff68a RW |
806 | if (!pm) { |
807 | pci_save_state(pci_dev); | |
7d2a01b8 | 808 | goto Fixup; |
931ff68a | 809 | } |
46939f8b RW |
810 | |
811 | if (pm->suspend_noirq) { | |
812 | pci_power_t prev = pci_dev->current_state; | |
813 | int error; | |
814 | ||
815 | error = pm->suspend_noirq(dev); | |
816 | suspend_report_result(pm->suspend_noirq, error); | |
817 | if (error) | |
818 | return error; | |
819 | ||
820 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
821 | && pci_dev->current_state != PCI_UNKNOWN) { | |
822 | WARN_ONCE(pci_dev->current_state != prev, | |
823 | "PCI PM: State of device not saved by %pF\n", | |
824 | pm->suspend_noirq); | |
7d2a01b8 | 825 | goto Fixup; |
46939f8b | 826 | } |
bbb44d9f RW |
827 | } |
828 | ||
46939f8b RW |
829 | if (!pci_dev->state_saved) { |
830 | pci_save_state(pci_dev); | |
9d26d3a8 | 831 | if (pci_power_manageable(pci_dev)) |
46939f8b RW |
832 | pci_prepare_to_sleep(pci_dev); |
833 | } | |
d67e37d7 | 834 | |
ca67ab5c RW |
835 | dev_dbg(dev, "PCI PM: Suspend power state: %s\n", |
836 | pci_power_name(pci_dev->current_state)); | |
837 | ||
46939f8b RW |
838 | pci_pm_set_unknown_state(pci_dev); |
839 | ||
dbf0e4c7 AS |
840 | /* |
841 | * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's | |
842 | * PCI COMMAND register isn't 0, the BIOS assumes that the controller | |
843 | * hasn't been quiesced and tries to turn it off. If the controller | |
844 | * is already in D3, this can hang or cause memory corruption. | |
845 | * | |
846 | * Since the value of the COMMAND register doesn't matter once the | |
847 | * device has been suspended, we can safely set it to 0 here. | |
848 | */ | |
849 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
850 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
851 | ||
7d2a01b8 AN |
852 | Fixup: |
853 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
854 | ||
bd755d77 RW |
855 | /* |
856 | * If the target system sleep state is suspend-to-idle, it is sufficient | |
857 | * to check whether or not the device's wakeup settings are good for | |
858 | * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause | |
859 | * pci_pm_complete() to take care of fixing up the device's state | |
860 | * anyway, if need be. | |
861 | */ | |
862 | dev->power.may_skip_resume = device_may_wakeup(dev) || | |
863 | !device_can_wakeup(dev); | |
864 | ||
46939f8b | 865 | return 0; |
c8958177 | 866 | } |
1da177e4 | 867 | |
f6dc1e5e | 868 | static int pci_pm_resume_noirq(struct device *dev) |
bbb44d9f RW |
869 | { |
870 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
871 | struct device_driver *drv = dev->driver; | |
355a72d7 | 872 | int error = 0; |
bbb44d9f | 873 | |
bd755d77 RW |
874 | if (dev_pm_may_skip_resume(dev)) |
875 | return 0; | |
876 | ||
c4b65157 RW |
877 | /* |
878 | * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend | |
879 | * during system suspend, so update their runtime PM status to "active" | |
880 | * as they are going to be put into D0 shortly. | |
881 | */ | |
882 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
883 | pm_runtime_set_active(dev); | |
884 | ||
6cbf8214 | 885 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 886 | |
ad8cfa1d | 887 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 888 | return pci_legacy_resume_early(dev); |
bb808945 | 889 | |
a39bd851 BH |
890 | pcie_pme_root_status_cleanup(pci_dev); |
891 | ||
f6dc1e5e RW |
892 | if (drv && drv->pm && drv->pm->resume_noirq) |
893 | error = drv->pm->resume_noirq(dev); | |
bbb44d9f RW |
894 | |
895 | return error; | |
896 | } | |
897 | ||
f6dc1e5e | 898 | static int pci_pm_resume(struct device *dev) |
bbb44d9f | 899 | { |
355a72d7 | 900 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 901 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
902 | int error = 0; |
903 | ||
418e4da3 RW |
904 | /* |
905 | * This is necessary for the suspend error path in which resume is | |
906 | * called without restoring the standard config registers of the device. | |
907 | */ | |
908 | if (pci_dev->state_saved) | |
909 | pci_restore_standard_config(pci_dev); | |
910 | ||
ad8cfa1d | 911 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 912 | return pci_legacy_resume(dev); |
bb808945 | 913 | |
5294e256 | 914 | pci_pm_default_resume(pci_dev); |
73410429 | 915 | |
5294e256 RW |
916 | if (pm) { |
917 | if (pm->resume) | |
918 | error = pm->resume(dev); | |
919 | } else { | |
920 | pci_pm_reenable_device(pci_dev); | |
921 | } | |
bbb44d9f | 922 | |
999cce4a | 923 | return error; |
bbb44d9f RW |
924 | } |
925 | ||
926 | #else /* !CONFIG_SUSPEND */ | |
927 | ||
928 | #define pci_pm_suspend NULL | |
c4b65157 | 929 | #define pci_pm_suspend_late NULL |
bbb44d9f RW |
930 | #define pci_pm_suspend_noirq NULL |
931 | #define pci_pm_resume NULL | |
932 | #define pci_pm_resume_noirq NULL | |
933 | ||
934 | #endif /* !CONFIG_SUSPEND */ | |
935 | ||
1f112cee | 936 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
bbb44d9f | 937 | |
699c1985 SO |
938 | |
939 | /* | |
940 | * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing | |
941 | * a hibernate transition | |
942 | */ | |
943 | struct dev_pm_ops __weak pcibios_pm_ops; | |
944 | ||
bbb44d9f RW |
945 | static int pci_pm_freeze(struct device *dev) |
946 | { | |
947 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 948 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 949 | |
ad8cfa1d RW |
950 | if (pci_has_legacy_pm_support(pci_dev)) |
951 | return pci_legacy_suspend(dev, PMSG_FREEZE); | |
bb808945 | 952 | |
5294e256 RW |
953 | if (!pm) { |
954 | pci_pm_default_suspend(pci_dev); | |
955 | return 0; | |
bbb44d9f RW |
956 | } |
957 | ||
7cd0602d RW |
958 | /* |
959 | * This used to be done in pci_pm_prepare() for all devices and some | |
960 | * drivers may depend on it, so do it here. Ideally, runtime-suspended | |
961 | * devices should not be touched during freeze/thaw transitions, | |
962 | * however. | |
963 | */ | |
ae860a19 | 964 | if (!dev_pm_smart_suspend_and_suspended(dev)) { |
c4b65157 | 965 | pm_runtime_resume(dev); |
ae860a19 MW |
966 | pci_dev->state_saved = false; |
967 | } | |
7cd0602d | 968 | |
5294e256 RW |
969 | if (pm->freeze) { |
970 | int error; | |
971 | ||
972 | error = pm->freeze(dev); | |
973 | suspend_report_result(pm->freeze, error); | |
974 | if (error) | |
975 | return error; | |
976 | } | |
977 | ||
5294e256 | 978 | return 0; |
bbb44d9f RW |
979 | } |
980 | ||
c4b65157 RW |
981 | static int pci_pm_freeze_late(struct device *dev) |
982 | { | |
983 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
984 | return 0; | |
985 | ||
bee344cb | 986 | return pm_generic_freeze_late(dev); |
c4b65157 RW |
987 | } |
988 | ||
bbb44d9f RW |
989 | static int pci_pm_freeze_noirq(struct device *dev) |
990 | { | |
355a72d7 | 991 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 992 | struct device_driver *drv = dev->driver; |
bbb44d9f | 993 | |
c4b65157 RW |
994 | if (dev_pm_smart_suspend_and_suspended(dev)) |
995 | return 0; | |
996 | ||
bb808945 RW |
997 | if (pci_has_legacy_pm_support(pci_dev)) |
998 | return pci_legacy_suspend_late(dev, PMSG_FREEZE); | |
999 | ||
d67e37d7 | 1000 | if (drv && drv->pm && drv->pm->freeze_noirq) { |
46939f8b RW |
1001 | int error; |
1002 | ||
d67e37d7 RW |
1003 | error = drv->pm->freeze_noirq(dev); |
1004 | suspend_report_result(drv->pm->freeze_noirq, error); | |
46939f8b RW |
1005 | if (error) |
1006 | return error; | |
bbb44d9f RW |
1007 | } |
1008 | ||
46939f8b RW |
1009 | if (!pci_dev->state_saved) |
1010 | pci_save_state(pci_dev); | |
d67e37d7 | 1011 | |
46939f8b RW |
1012 | pci_pm_set_unknown_state(pci_dev); |
1013 | ||
699c1985 SO |
1014 | if (pcibios_pm_ops.freeze_noirq) |
1015 | return pcibios_pm_ops.freeze_noirq(dev); | |
1016 | ||
46939f8b | 1017 | return 0; |
bbb44d9f RW |
1018 | } |
1019 | ||
f6dc1e5e | 1020 | static int pci_pm_thaw_noirq(struct device *dev) |
bbb44d9f | 1021 | { |
355a72d7 | 1022 | struct pci_dev *pci_dev = to_pci_dev(dev); |
bbb44d9f RW |
1023 | struct device_driver *drv = dev->driver; |
1024 | int error = 0; | |
1025 | ||
c4b65157 RW |
1026 | /* |
1027 | * If the device is in runtime suspend, the code below may not work | |
1028 | * correctly with it, so skip that code and make the PM core skip all of | |
1029 | * the subsequent "thaw" callbacks for the device. | |
1030 | */ | |
1031 | if (dev_pm_smart_suspend_and_suspended(dev)) { | |
3487972d | 1032 | dev_pm_skip_next_resume_phases(dev); |
c4b65157 RW |
1033 | return 0; |
1034 | } | |
1035 | ||
699c1985 SO |
1036 | if (pcibios_pm_ops.thaw_noirq) { |
1037 | error = pcibios_pm_ops.thaw_noirq(dev); | |
1038 | if (error) | |
1039 | return error; | |
1040 | } | |
1041 | ||
ad8cfa1d | 1042 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1043 | return pci_legacy_resume_early(dev); |
bb808945 | 1044 | |
5839ee73 RW |
1045 | /* |
1046 | * pci_restore_state() requires the device to be in D0 (because of MSI | |
1047 | * restoration among other things), so force it into D0 in case the | |
1048 | * driver's "freeze" callbacks put it into a low-power state directly. | |
1049 | */ | |
1050 | pci_set_power_state(pci_dev, PCI_D0); | |
e60514bd | 1051 | pci_restore_state(pci_dev); |
d67e37d7 | 1052 | |
f6dc1e5e RW |
1053 | if (drv && drv->pm && drv->pm->thaw_noirq) |
1054 | error = drv->pm->thaw_noirq(dev); | |
bbb44d9f RW |
1055 | |
1056 | return error; | |
1057 | } | |
1058 | ||
f6dc1e5e | 1059 | static int pci_pm_thaw(struct device *dev) |
bbb44d9f | 1060 | { |
355a72d7 | 1061 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1062 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1063 | int error = 0; |
1064 | ||
ad8cfa1d | 1065 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1066 | return pci_legacy_resume(dev); |
bb808945 | 1067 | |
5294e256 RW |
1068 | if (pm) { |
1069 | if (pm->thaw) | |
1070 | error = pm->thaw(dev); | |
1071 | } else { | |
1072 | pci_pm_reenable_device(pci_dev); | |
1073 | } | |
bbb44d9f | 1074 | |
4b77b0a2 RW |
1075 | pci_dev->state_saved = false; |
1076 | ||
bbb44d9f RW |
1077 | return error; |
1078 | } | |
1079 | ||
1080 | static int pci_pm_poweroff(struct device *dev) | |
1081 | { | |
355a72d7 | 1082 | struct pci_dev *pci_dev = to_pci_dev(dev); |
8150f32b | 1083 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f | 1084 | |
ad8cfa1d RW |
1085 | if (pci_has_legacy_pm_support(pci_dev)) |
1086 | return pci_legacy_suspend(dev, PMSG_HIBERNATE); | |
bb808945 | 1087 | |
5294e256 RW |
1088 | if (!pm) { |
1089 | pci_pm_default_suspend(pci_dev); | |
c4b65157 | 1090 | return 0; |
5294e256 RW |
1091 | } |
1092 | ||
7cd0602d | 1093 | /* The reason to do that is the same as in pci_pm_suspend(). */ |
c4b65157 RW |
1094 | if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) || |
1095 | !pci_dev_keep_suspended(pci_dev)) | |
1096 | pm_runtime_resume(dev); | |
7cd0602d | 1097 | |
82fee4d6 | 1098 | pci_dev->state_saved = false; |
5294e256 | 1099 | if (pm->poweroff) { |
46939f8b RW |
1100 | int error; |
1101 | ||
ddb7c9d2 RW |
1102 | error = pm->poweroff(dev); |
1103 | suspend_report_result(pm->poweroff, error); | |
46939f8b RW |
1104 | if (error) |
1105 | return error; | |
bbb44d9f RW |
1106 | } |
1107 | ||
46939f8b | 1108 | return 0; |
bbb44d9f | 1109 | } |
c9b9972b | 1110 | |
c4b65157 RW |
1111 | static int pci_pm_poweroff_late(struct device *dev) |
1112 | { | |
1113 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1114 | return 0; | |
699c1985 | 1115 | |
c4b65157 RW |
1116 | pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev)); |
1117 | ||
1118 | return pm_generic_poweroff_late(dev); | |
bbb44d9f RW |
1119 | } |
1120 | ||
1121 | static int pci_pm_poweroff_noirq(struct device *dev) | |
1122 | { | |
46939f8b | 1123 | struct pci_dev *pci_dev = to_pci_dev(dev); |
adf09493 | 1124 | struct device_driver *drv = dev->driver; |
bbb44d9f | 1125 | |
c4b65157 RW |
1126 | if (dev_pm_smart_suspend_and_suspended(dev)) |
1127 | return 0; | |
1128 | ||
bb808945 RW |
1129 | if (pci_has_legacy_pm_support(to_pci_dev(dev))) |
1130 | return pci_legacy_suspend_late(dev, PMSG_HIBERNATE); | |
1131 | ||
7d2a01b8 AN |
1132 | if (!drv || !drv->pm) { |
1133 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); | |
46939f8b | 1134 | return 0; |
7d2a01b8 | 1135 | } |
46939f8b RW |
1136 | |
1137 | if (drv->pm->poweroff_noirq) { | |
1138 | int error; | |
1139 | ||
d67e37d7 RW |
1140 | error = drv->pm->poweroff_noirq(dev); |
1141 | suspend_report_result(drv->pm->poweroff_noirq, error); | |
46939f8b RW |
1142 | if (error) |
1143 | return error; | |
bbb44d9f RW |
1144 | } |
1145 | ||
326c1cda | 1146 | if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev)) |
46939f8b RW |
1147 | pci_prepare_to_sleep(pci_dev); |
1148 | ||
0b68c8e2 RW |
1149 | /* |
1150 | * The reason for doing this here is the same as for the analogous code | |
1151 | * in pci_pm_suspend_noirq(). | |
1152 | */ | |
1153 | if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) | |
1154 | pci_write_config_word(pci_dev, PCI_COMMAND, 0); | |
1155 | ||
7d2a01b8 AN |
1156 | pci_fixup_device(pci_fixup_suspend_late, pci_dev); |
1157 | ||
699c1985 SO |
1158 | if (pcibios_pm_ops.poweroff_noirq) |
1159 | return pcibios_pm_ops.poweroff_noirq(dev); | |
1160 | ||
46939f8b | 1161 | return 0; |
bbb44d9f RW |
1162 | } |
1163 | ||
f6dc1e5e | 1164 | static int pci_pm_restore_noirq(struct device *dev) |
bbb44d9f RW |
1165 | { |
1166 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1167 | struct device_driver *drv = dev->driver; | |
355a72d7 | 1168 | int error = 0; |
bbb44d9f | 1169 | |
c4b65157 RW |
1170 | /* This is analogous to the pci_pm_resume_noirq() case. */ |
1171 | if (dev_pm_smart_suspend_and_suspended(dev)) | |
1172 | pm_runtime_set_active(dev); | |
1173 | ||
699c1985 SO |
1174 | if (pcibios_pm_ops.restore_noirq) { |
1175 | error = pcibios_pm_ops.restore_noirq(dev); | |
1176 | if (error) | |
1177 | return error; | |
1178 | } | |
1179 | ||
6cbf8214 | 1180 | pci_pm_default_resume_early(pci_dev); |
aa8c6c93 | 1181 | |
ad8cfa1d | 1182 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1183 | return pci_legacy_resume_early(dev); |
bb808945 | 1184 | |
f6dc1e5e RW |
1185 | if (drv && drv->pm && drv->pm->restore_noirq) |
1186 | error = drv->pm->restore_noirq(dev); | |
bbb44d9f RW |
1187 | |
1188 | return error; | |
1189 | } | |
1190 | ||
f6dc1e5e | 1191 | static int pci_pm_restore(struct device *dev) |
bbb44d9f RW |
1192 | { |
1193 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
8150f32b | 1194 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
bbb44d9f RW |
1195 | int error = 0; |
1196 | ||
418e4da3 RW |
1197 | /* |
1198 | * This is necessary for the hibernation error path in which restore is | |
1199 | * called without restoring the standard config registers of the device. | |
1200 | */ | |
1201 | if (pci_dev->state_saved) | |
1202 | pci_restore_standard_config(pci_dev); | |
1203 | ||
ad8cfa1d | 1204 | if (pci_has_legacy_pm_support(pci_dev)) |
f6dc1e5e | 1205 | return pci_legacy_resume(dev); |
bb808945 | 1206 | |
5294e256 | 1207 | pci_pm_default_resume(pci_dev); |
73410429 | 1208 | |
5294e256 RW |
1209 | if (pm) { |
1210 | if (pm->restore) | |
1211 | error = pm->restore(dev); | |
1212 | } else { | |
1213 | pci_pm_reenable_device(pci_dev); | |
1214 | } | |
bbb44d9f RW |
1215 | |
1216 | return error; | |
c8958177 | 1217 | } |
1da177e4 | 1218 | |
1f112cee | 1219 | #else /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f RW |
1220 | |
1221 | #define pci_pm_freeze NULL | |
c4b65157 | 1222 | #define pci_pm_freeze_late NULL |
bbb44d9f RW |
1223 | #define pci_pm_freeze_noirq NULL |
1224 | #define pci_pm_thaw NULL | |
1225 | #define pci_pm_thaw_noirq NULL | |
1226 | #define pci_pm_poweroff NULL | |
c4b65157 | 1227 | #define pci_pm_poweroff_late NULL |
bbb44d9f RW |
1228 | #define pci_pm_poweroff_noirq NULL |
1229 | #define pci_pm_restore NULL | |
1230 | #define pci_pm_restore_noirq NULL | |
1231 | ||
1f112cee | 1232 | #endif /* !CONFIG_HIBERNATE_CALLBACKS */ |
bbb44d9f | 1233 | |
fbb988be | 1234 | #ifdef CONFIG_PM |
6cbf8214 RW |
1235 | |
1236 | static int pci_pm_runtime_suspend(struct device *dev) | |
1237 | { | |
1238 | struct pci_dev *pci_dev = to_pci_dev(dev); | |
1239 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1240 | pci_power_t prev = pci_dev->current_state; | |
1241 | int error; | |
1242 | ||
967577b0 | 1243 | /* |
5775b843 RW |
1244 | * If pci_dev->driver is not set (unbound), we leave the device in D0, |
1245 | * but it may go to D3cold when the bridge above it runtime suspends. | |
1246 | * Save its config space in case that happens. | |
967577b0 | 1247 | */ |
5775b843 RW |
1248 | if (!pci_dev->driver) { |
1249 | pci_save_state(pci_dev); | |
967577b0 | 1250 | return 0; |
5775b843 | 1251 | } |
967577b0 | 1252 | |
6cbf8214 RW |
1253 | if (!pm || !pm->runtime_suspend) |
1254 | return -ENOSYS; | |
1255 | ||
82fee4d6 | 1256 | pci_dev->state_saved = false; |
6cbf8214 | 1257 | error = pm->runtime_suspend(dev); |
06bf403d ID |
1258 | if (error) { |
1259 | /* | |
1260 | * -EBUSY and -EAGAIN is used to request the runtime PM core | |
1261 | * to schedule a new suspend, so log the event only with debug | |
1262 | * log level. | |
1263 | */ | |
1264 | if (error == -EBUSY || error == -EAGAIN) | |
1265 | dev_dbg(dev, "can't suspend now (%pf returned %d)\n", | |
1266 | pm->runtime_suspend, error); | |
1267 | else | |
1268 | dev_err(dev, "can't suspend (%pf returned %d)\n", | |
1269 | pm->runtime_suspend, error); | |
1270 | ||
6cbf8214 | 1271 | return error; |
06bf403d | 1272 | } |
6cbf8214 RW |
1273 | |
1274 | pci_fixup_device(pci_fixup_suspend, pci_dev); | |
1275 | ||
1276 | if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0 | |
1277 | && pci_dev->current_state != PCI_UNKNOWN) { | |
1278 | WARN_ONCE(pci_dev->current_state != prev, | |
1279 | "PCI PM: State of device not saved by %pF\n", | |
1280 | pm->runtime_suspend); | |
1281 | return 0; | |
1282 | } | |
1283 | ||
42eca230 | 1284 | if (!pci_dev->state_saved) { |
6cbf8214 | 1285 | pci_save_state(pci_dev); |
42eca230 DA |
1286 | pci_finish_runtime_suspend(pci_dev); |
1287 | } | |
6cbf8214 RW |
1288 | |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | static int pci_pm_runtime_resume(struct device *dev) | |
1293 | { | |
448bd857 | 1294 | int rc; |
6cbf8214 RW |
1295 | struct pci_dev *pci_dev = to_pci_dev(dev); |
1296 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; | |
1297 | ||
967577b0 | 1298 | /* |
5775b843 RW |
1299 | * Restoring config space is necessary even if the device is not bound |
1300 | * to a driver because although we left it in D0, it may have gone to | |
1301 | * D3cold when the bridge above it runtime suspended. | |
967577b0 | 1302 | */ |
5775b843 RW |
1303 | pci_restore_standard_config(pci_dev); |
1304 | ||
967577b0 HY |
1305 | if (!pci_dev->driver) |
1306 | return 0; | |
1307 | ||
6cbf8214 RW |
1308 | if (!pm || !pm->runtime_resume) |
1309 | return -ENOSYS; | |
1310 | ||
db288c9c | 1311 | pci_fixup_device(pci_fixup_resume_early, pci_dev); |
0847684c | 1312 | pci_enable_wake(pci_dev, PCI_D0, false); |
6cbf8214 RW |
1313 | pci_fixup_device(pci_fixup_resume, pci_dev); |
1314 | ||
448bd857 HY |
1315 | rc = pm->runtime_resume(dev); |
1316 | ||
1317 | pci_dev->runtime_d3cold = false; | |
1318 | ||
1319 | return rc; | |
6cbf8214 RW |
1320 | } |
1321 | ||
1322 | static int pci_pm_runtime_idle(struct device *dev) | |
1323 | { | |
967577b0 | 1324 | struct pci_dev *pci_dev = to_pci_dev(dev); |
6cbf8214 | 1325 | const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
45f0a85c | 1326 | int ret = 0; |
6cbf8214 | 1327 | |
967577b0 HY |
1328 | /* |
1329 | * If pci_dev->driver is not set (unbound), the device should | |
1330 | * always remain in D0 regardless of the runtime PM status | |
1331 | */ | |
1332 | if (!pci_dev->driver) | |
45f0a85c | 1333 | return 0; |
967577b0 | 1334 | |
6cbf8214 RW |
1335 | if (!pm) |
1336 | return -ENOSYS; | |
1337 | ||
45f0a85c RW |
1338 | if (pm->runtime_idle) |
1339 | ret = pm->runtime_idle(dev); | |
6cbf8214 | 1340 | |
45f0a85c | 1341 | return ret; |
6cbf8214 RW |
1342 | } |
1343 | ||
f91da04d | 1344 | static const struct dev_pm_ops pci_dev_pm_ops = { |
adf09493 | 1345 | .prepare = pci_pm_prepare, |
2cef548a | 1346 | .complete = pci_pm_complete, |
adf09493 | 1347 | .suspend = pci_pm_suspend, |
c4b65157 | 1348 | .suspend_late = pci_pm_suspend_late, |
adf09493 RW |
1349 | .resume = pci_pm_resume, |
1350 | .freeze = pci_pm_freeze, | |
c4b65157 | 1351 | .freeze_late = pci_pm_freeze_late, |
adf09493 RW |
1352 | .thaw = pci_pm_thaw, |
1353 | .poweroff = pci_pm_poweroff, | |
c4b65157 | 1354 | .poweroff_late = pci_pm_poweroff_late, |
adf09493 | 1355 | .restore = pci_pm_restore, |
bbb44d9f RW |
1356 | .suspend_noirq = pci_pm_suspend_noirq, |
1357 | .resume_noirq = pci_pm_resume_noirq, | |
1358 | .freeze_noirq = pci_pm_freeze_noirq, | |
1359 | .thaw_noirq = pci_pm_thaw_noirq, | |
1360 | .poweroff_noirq = pci_pm_poweroff_noirq, | |
1361 | .restore_noirq = pci_pm_restore_noirq, | |
6cbf8214 RW |
1362 | .runtime_suspend = pci_pm_runtime_suspend, |
1363 | .runtime_resume = pci_pm_runtime_resume, | |
1364 | .runtime_idle = pci_pm_runtime_idle, | |
bbb44d9f RW |
1365 | }; |
1366 | ||
adf09493 | 1367 | #define PCI_PM_OPS_PTR (&pci_dev_pm_ops) |
bbb44d9f | 1368 | |
fbb988be RW |
1369 | #else /* !CONFIG_PM */ |
1370 | ||
1371 | #define pci_pm_runtime_suspend NULL | |
1372 | #define pci_pm_runtime_resume NULL | |
1373 | #define pci_pm_runtime_idle NULL | |
bbb44d9f RW |
1374 | |
1375 | #define PCI_PM_OPS_PTR NULL | |
1376 | ||
fbb988be | 1377 | #endif /* !CONFIG_PM */ |
bbb44d9f | 1378 | |
1da177e4 | 1379 | /** |
863b18f4 | 1380 | * __pci_register_driver - register a new pci driver |
1da177e4 | 1381 | * @drv: the driver structure to register |
863b18f4 | 1382 | * @owner: owner module of drv |
f95d882d | 1383 | * @mod_name: module name string |
f7625980 | 1384 | * |
1da177e4 | 1385 | * Adds the driver structure to the list of registered drivers. |
f7625980 BH |
1386 | * Returns a negative value on error, otherwise 0. |
1387 | * If no error occurred, the driver remains registered even if | |
1da177e4 LT |
1388 | * no device was claimed during registration. |
1389 | */ | |
725522b5 GKH |
1390 | int __pci_register_driver(struct pci_driver *drv, struct module *owner, |
1391 | const char *mod_name) | |
1da177e4 | 1392 | { |
1da177e4 LT |
1393 | /* initialize common driver fields */ |
1394 | drv->driver.name = drv->name; | |
1395 | drv->driver.bus = &pci_bus_type; | |
863b18f4 | 1396 | drv->driver.owner = owner; |
725522b5 | 1397 | drv->driver.mod_name = mod_name; |
92d50fc1 | 1398 | drv->driver.groups = drv->groups; |
50b00755 | 1399 | |
75865858 GKH |
1400 | spin_lock_init(&drv->dynids.lock); |
1401 | INIT_LIST_HEAD(&drv->dynids.list); | |
1da177e4 LT |
1402 | |
1403 | /* register with core */ | |
bfb09a86 | 1404 | return driver_register(&drv->driver); |
1da177e4 | 1405 | } |
b7fe9434 | 1406 | EXPORT_SYMBOL(__pci_register_driver); |
1da177e4 LT |
1407 | |
1408 | /** | |
1409 | * pci_unregister_driver - unregister a pci driver | |
1410 | * @drv: the driver structure to unregister | |
f7625980 | 1411 | * |
1da177e4 LT |
1412 | * Deletes the driver structure from the list of registered PCI drivers, |
1413 | * gives it a chance to clean up by calling its remove() function for | |
1414 | * each device it was responsible for, and marks those devices as | |
1415 | * driverless. | |
1416 | */ | |
1417 | ||
3c78bc61 | 1418 | void pci_unregister_driver(struct pci_driver *drv) |
1da177e4 LT |
1419 | { |
1420 | driver_unregister(&drv->driver); | |
1421 | pci_free_dynids(drv); | |
1422 | } | |
b7fe9434 | 1423 | EXPORT_SYMBOL(pci_unregister_driver); |
1da177e4 LT |
1424 | |
1425 | static struct pci_driver pci_compat_driver = { | |
1426 | .name = "compat" | |
1427 | }; | |
1428 | ||
1429 | /** | |
1430 | * pci_dev_driver - get the pci_driver of a device | |
1431 | * @dev: the device to query | |
1432 | * | |
f7625980 | 1433 | * Returns the appropriate pci_driver structure or %NULL if there is no |
1da177e4 LT |
1434 | * registered driver for the device. |
1435 | */ | |
3c78bc61 | 1436 | struct pci_driver *pci_dev_driver(const struct pci_dev *dev) |
1da177e4 LT |
1437 | { |
1438 | if (dev->driver) | |
1439 | return dev->driver; | |
1440 | else { | |
1441 | int i; | |
3c78bc61 | 1442 | for (i = 0; i <= PCI_ROM_RESOURCE; i++) |
1da177e4 LT |
1443 | if (dev->resource[i].flags & IORESOURCE_BUSY) |
1444 | return &pci_compat_driver; | |
1445 | } | |
1446 | return NULL; | |
1447 | } | |
b7fe9434 | 1448 | EXPORT_SYMBOL(pci_dev_driver); |
1da177e4 LT |
1449 | |
1450 | /** | |
1451 | * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure | |
1da177e4 | 1452 | * @dev: the PCI device structure to match against |
8f7020d3 | 1453 | * @drv: the device driver to search for matching PCI device id structures |
f7625980 | 1454 | * |
1da177e4 | 1455 | * Used by a driver to check whether a PCI device present in the |
8f7020d3 | 1456 | * system is in its list of supported devices. Returns the matching |
1da177e4 LT |
1457 | * pci_device_id structure or %NULL if there is no match. |
1458 | */ | |
75865858 | 1459 | static int pci_bus_match(struct device *dev, struct device_driver *drv) |
1da177e4 | 1460 | { |
75865858 | 1461 | struct pci_dev *pci_dev = to_pci_dev(dev); |
58d9a38f | 1462 | struct pci_driver *pci_drv; |
1da177e4 LT |
1463 | const struct pci_device_id *found_id; |
1464 | ||
58d9a38f YL |
1465 | if (!pci_dev->match_driver) |
1466 | return 0; | |
1467 | ||
1468 | pci_drv = to_pci_driver(drv); | |
75865858 | 1469 | found_id = pci_match_device(pci_drv, pci_dev); |
1da177e4 LT |
1470 | if (found_id) |
1471 | return 1; | |
1472 | ||
75865858 | 1473 | return 0; |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | /** | |
1477 | * pci_dev_get - increments the reference count of the pci device structure | |
1478 | * @dev: the device being referenced | |
1479 | * | |
1480 | * Each live reference to a device should be refcounted. | |
1481 | * | |
1482 | * Drivers for PCI devices should normally record such references in | |
1483 | * their probe() methods, when they bind to a device, and release | |
1484 | * them by calling pci_dev_put(), in their disconnect() methods. | |
1485 | * | |
1486 | * A pointer to the device with the incremented reference counter is returned. | |
1487 | */ | |
1488 | struct pci_dev *pci_dev_get(struct pci_dev *dev) | |
1489 | { | |
1490 | if (dev) | |
1491 | get_device(&dev->dev); | |
1492 | return dev; | |
1493 | } | |
b7fe9434 | 1494 | EXPORT_SYMBOL(pci_dev_get); |
1da177e4 LT |
1495 | |
1496 | /** | |
1497 | * pci_dev_put - release a use of the pci device structure | |
1498 | * @dev: device that's been disconnected | |
1499 | * | |
1500 | * Must be called when a user of a device is finished with it. When the last | |
1501 | * user of the device calls this function, the memory of the device is freed. | |
1502 | */ | |
1503 | void pci_dev_put(struct pci_dev *dev) | |
1504 | { | |
1505 | if (dev) | |
1506 | put_device(&dev->dev); | |
1507 | } | |
b7fe9434 | 1508 | EXPORT_SYMBOL(pci_dev_put); |
1da177e4 | 1509 | |
8ccc9aa1 BP |
1510 | static int pci_uevent(struct device *dev, struct kobj_uevent_env *env) |
1511 | { | |
1512 | struct pci_dev *pdev; | |
1513 | ||
1514 | if (!dev) | |
1515 | return -ENODEV; | |
1516 | ||
1517 | pdev = to_pci_dev(dev); | |
8ccc9aa1 BP |
1518 | |
1519 | if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class)) | |
1520 | return -ENOMEM; | |
1521 | ||
1522 | if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device)) | |
1523 | return -ENOMEM; | |
1524 | ||
1525 | if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor, | |
1526 | pdev->subsystem_device)) | |
1527 | return -ENOMEM; | |
1528 | ||
1529 | if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev))) | |
1530 | return -ENOMEM; | |
1531 | ||
145b3fe5 | 1532 | if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X", |
8ccc9aa1 BP |
1533 | pdev->vendor, pdev->device, |
1534 | pdev->subsystem_vendor, pdev->subsystem_device, | |
1535 | (u8)(pdev->class >> 16), (u8)(pdev->class >> 8), | |
1536 | (u8)(pdev->class))) | |
1537 | return -ENOMEM; | |
efdd4070 | 1538 | |
8ccc9aa1 BP |
1539 | return 0; |
1540 | } | |
1541 | ||
2e28bc84 | 1542 | #if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH) |
3ecac020 ME |
1543 | /** |
1544 | * pci_uevent_ers - emit a uevent during recovery path of PCI device | |
1545 | * @pdev: PCI device undergoing error recovery | |
1546 | * @err_type: type of error event | |
1547 | */ | |
1548 | void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type) | |
1549 | { | |
1550 | int idx = 0; | |
1551 | char *envp[3]; | |
1552 | ||
1553 | switch (err_type) { | |
1554 | case PCI_ERS_RESULT_NONE: | |
1555 | case PCI_ERS_RESULT_CAN_RECOVER: | |
1556 | envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY"; | |
1557 | envp[idx++] = "DEVICE_ONLINE=0"; | |
1558 | break; | |
1559 | case PCI_ERS_RESULT_RECOVERED: | |
1560 | envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY"; | |
1561 | envp[idx++] = "DEVICE_ONLINE=1"; | |
1562 | break; | |
1563 | case PCI_ERS_RESULT_DISCONNECT: | |
1564 | envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY"; | |
1565 | envp[idx++] = "DEVICE_ONLINE=0"; | |
1566 | break; | |
1567 | default: | |
1568 | break; | |
1569 | } | |
1570 | ||
1571 | if (idx > 0) { | |
1572 | envp[idx++] = NULL; | |
1573 | kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp); | |
1574 | } | |
1575 | } | |
1576 | #endif | |
1577 | ||
02e0bea6 PS |
1578 | static int pci_bus_num_vf(struct device *dev) |
1579 | { | |
1580 | return pci_num_vf(to_pci_dev(dev)); | |
1581 | } | |
1582 | ||
07397df2 NG |
1583 | /** |
1584 | * pci_dma_configure - Setup DMA configuration | |
1585 | * @dev: ptr to dev structure | |
1586 | * | |
1587 | * Function to update PCI devices's DMA configuration using the same | |
1588 | * info from the OF node or ACPI node of host bridge's parent (if any). | |
1589 | */ | |
1590 | static int pci_dma_configure(struct device *dev) | |
1591 | { | |
1592 | struct device *bridge; | |
1593 | int ret = 0; | |
1594 | ||
1595 | bridge = pci_get_host_bridge_device(to_pci_dev(dev)); | |
1596 | ||
1597 | if (IS_ENABLED(CONFIG_OF) && bridge->parent && | |
1598 | bridge->parent->of_node) { | |
3d6ce86e | 1599 | ret = of_dma_configure(dev, bridge->parent->of_node, true); |
07397df2 NG |
1600 | } else if (has_acpi_companion(bridge)) { |
1601 | struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); | |
1602 | enum dev_dma_attr attr = acpi_get_dma_attr(adev); | |
1603 | ||
1604 | if (attr != DEV_DMA_NOT_SUPPORTED) | |
1605 | ret = acpi_dma_configure(dev, attr); | |
1606 | } | |
1607 | ||
1608 | pci_put_host_bridge_device(bridge); | |
1609 | return ret; | |
1610 | } | |
1611 | ||
1da177e4 LT |
1612 | struct bus_type pci_bus_type = { |
1613 | .name = "pci", | |
1614 | .match = pci_bus_match, | |
312c004d | 1615 | .uevent = pci_uevent, |
b15d686a RK |
1616 | .probe = pci_device_probe, |
1617 | .remove = pci_device_remove, | |
cbd69dbb | 1618 | .shutdown = pci_device_shutdown, |
5136b2da | 1619 | .dev_groups = pci_dev_groups, |
0f49ba55 | 1620 | .bus_groups = pci_bus_groups, |
2229c1fb | 1621 | .drv_groups = pci_drv_groups, |
bbb44d9f | 1622 | .pm = PCI_PM_OPS_PTR, |
02e0bea6 | 1623 | .num_vf = pci_bus_num_vf, |
07397df2 | 1624 | .dma_configure = pci_dma_configure, |
1da177e4 | 1625 | }; |
b7fe9434 | 1626 | EXPORT_SYMBOL(pci_bus_type); |
1da177e4 | 1627 | |
c6c889d9 BH |
1628 | #ifdef CONFIG_PCIEPORTBUS |
1629 | static int pcie_port_bus_match(struct device *dev, struct device_driver *drv) | |
1630 | { | |
1631 | struct pcie_device *pciedev; | |
1632 | struct pcie_port_service_driver *driver; | |
1633 | ||
1634 | if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type) | |
1635 | return 0; | |
1636 | ||
1637 | pciedev = to_pcie_device(dev); | |
1638 | driver = to_service_driver(drv); | |
1639 | ||
1640 | if (driver->service != pciedev->service) | |
1641 | return 0; | |
1642 | ||
1643 | if (driver->port_type != PCIE_ANY_PORT && | |
1644 | driver->port_type != pci_pcie_type(pciedev->port)) | |
1645 | return 0; | |
1646 | ||
1647 | return 1; | |
1648 | } | |
1649 | ||
1650 | struct bus_type pcie_port_bus_type = { | |
1651 | .name = "pci_express", | |
1652 | .match = pcie_port_bus_match, | |
1653 | }; | |
1654 | EXPORT_SYMBOL_GPL(pcie_port_bus_type); | |
1655 | #endif | |
1656 | ||
1da177e4 LT |
1657 | static int __init pci_driver_init(void) |
1658 | { | |
c6c889d9 BH |
1659 | int ret; |
1660 | ||
1661 | ret = bus_register(&pci_bus_type); | |
1662 | if (ret) | |
1663 | return ret; | |
1664 | ||
1665 | #ifdef CONFIG_PCIEPORTBUS | |
1666 | ret = bus_register(&pcie_port_bus_type); | |
1667 | if (ret) | |
1668 | return ret; | |
1669 | #endif | |
1670 | ||
1671 | return 0; | |
1da177e4 | 1672 | } |
1da177e4 | 1673 | postcore_initcall(pci_driver_init); |