Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0
2 : /*
3 : * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
4 : * (C) Copyright 2007 Novell Inc.
5 : */
6 :
7 : #include <linux/pci.h>
8 : #include <linux/module.h>
9 : #include <linux/init.h>
10 : #include <linux/device.h>
11 : #include <linux/mempolicy.h>
12 : #include <linux/string.h>
13 : #include <linux/slab.h>
14 : #include <linux/sched.h>
15 : #include <linux/sched/isolation.h>
16 : #include <linux/cpu.h>
17 : #include <linux/pm_runtime.h>
18 : #include <linux/suspend.h>
19 : #include <linux/kexec.h>
20 : #include <linux/of_device.h>
21 : #include <linux/acpi.h>
22 : #include <linux/dma-map-ops.h>
23 : #include <linux/iommu.h>
24 : #include "pci.h"
25 : #include "pcie/portdrv.h"
26 :
27 : struct pci_dynid {
28 : struct list_head node;
29 : struct pci_device_id id;
30 : };
31 :
32 : /**
33 : * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
34 : * @drv: target pci driver
35 : * @vendor: PCI vendor ID
36 : * @device: PCI device ID
37 : * @subvendor: PCI subvendor ID
38 : * @subdevice: PCI subdevice ID
39 : * @class: PCI class
40 : * @class_mask: PCI class mask
41 : * @driver_data: private driver data
42 : *
43 : * Adds a new dynamic pci device ID to this driver and causes the
44 : * driver to probe for all devices again. @drv must have been
45 : * registered prior to calling this function.
46 : *
47 : * CONTEXT:
48 : * Does GFP_KERNEL allocation.
49 : *
50 : * RETURNS:
51 : * 0 on success, -errno on failure.
52 : */
53 0 : int pci_add_dynid(struct pci_driver *drv,
54 : unsigned int vendor, unsigned int device,
55 : unsigned int subvendor, unsigned int subdevice,
56 : unsigned int class, unsigned int class_mask,
57 : unsigned long driver_data)
58 : {
59 : struct pci_dynid *dynid;
60 :
61 0 : dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
62 0 : if (!dynid)
63 : return -ENOMEM;
64 :
65 0 : dynid->id.vendor = vendor;
66 0 : dynid->id.device = device;
67 0 : dynid->id.subvendor = subvendor;
68 0 : dynid->id.subdevice = subdevice;
69 0 : dynid->id.class = class;
70 0 : dynid->id.class_mask = class_mask;
71 0 : dynid->id.driver_data = driver_data;
72 :
73 0 : spin_lock(&drv->dynids.lock);
74 0 : list_add_tail(&dynid->node, &drv->dynids.list);
75 0 : spin_unlock(&drv->dynids.lock);
76 :
77 0 : return driver_attach(&drv->driver);
78 : }
79 : EXPORT_SYMBOL_GPL(pci_add_dynid);
80 :
81 0 : static void pci_free_dynids(struct pci_driver *drv)
82 : {
83 : struct pci_dynid *dynid, *n;
84 :
85 0 : spin_lock(&drv->dynids.lock);
86 0 : list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 0 : list_del(&dynid->node);
88 0 : kfree(dynid);
89 : }
90 0 : spin_unlock(&drv->dynids.lock);
91 0 : }
92 :
93 : /**
94 : * pci_match_id - See if a PCI device matches a given pci_id table
95 : * @ids: array of PCI device ID structures to search in
96 : * @dev: the PCI device structure to match against.
97 : *
98 : * Used by a driver to check whether a PCI device is in its list of
99 : * supported devices. Returns the matching pci_device_id structure or
100 : * %NULL if there is no match.
101 : *
102 : * Deprecated; don't use this as it will not catch any dynamic IDs
103 : * that a driver might want to check for.
104 : */
105 0 : const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
106 : struct pci_dev *dev)
107 : {
108 0 : if (ids) {
109 0 : while (ids->vendor || ids->subvendor || ids->class_mask) {
110 0 : if (pci_match_one_device(ids, dev))
111 : return ids;
112 0 : ids++;
113 : }
114 : }
115 : return NULL;
116 : }
117 : EXPORT_SYMBOL(pci_match_id);
118 :
119 : static const struct pci_device_id pci_device_id_any = {
120 : .vendor = PCI_ANY_ID,
121 : .device = PCI_ANY_ID,
122 : .subvendor = PCI_ANY_ID,
123 : .subdevice = PCI_ANY_ID,
124 : };
125 :
126 : /**
127 : * pci_match_device - See if a device matches a driver's list of IDs
128 : * @drv: the PCI driver to match against
129 : * @dev: the PCI device structure to match against
130 : *
131 : * Used by a driver to check whether a PCI device is in its list of
132 : * supported devices or in the dynids list, which may have been augmented
133 : * via the sysfs "new_id" file. Returns the matching pci_device_id
134 : * structure or %NULL if there is no match.
135 : */
136 0 : static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
137 : struct pci_dev *dev)
138 : {
139 : struct pci_dynid *dynid;
140 0 : const struct pci_device_id *found_id = NULL, *ids;
141 :
142 : /* When driver_override is set, only bind to the matching driver */
143 0 : if (dev->driver_override && strcmp(dev->driver_override, drv->name))
144 : return NULL;
145 :
146 : /* Look at the dynamic ids first, before the static ones */
147 0 : spin_lock(&drv->dynids.lock);
148 0 : list_for_each_entry(dynid, &drv->dynids.list, node) {
149 0 : if (pci_match_one_device(&dynid->id, dev)) {
150 : found_id = &dynid->id;
151 : break;
152 : }
153 : }
154 0 : spin_unlock(&drv->dynids.lock);
155 :
156 0 : if (found_id)
157 : return found_id;
158 :
159 0 : for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
160 0 : ids = found_id + 1) {
161 : /*
162 : * The match table is split based on driver_override.
163 : * In case override_only was set, enforce driver_override
164 : * matching.
165 : */
166 0 : if (found_id->override_only) {
167 0 : if (dev->driver_override)
168 : return found_id;
169 : } else {
170 : return found_id;
171 : }
172 : }
173 :
174 : /* driver_override will always match, send a dummy id */
175 0 : if (dev->driver_override)
176 : return &pci_device_id_any;
177 0 : return NULL;
178 : }
179 :
180 : /**
181 : * new_id_store - sysfs frontend to pci_add_dynid()
182 : * @driver: target device driver
183 : * @buf: buffer for scanning device ID data
184 : * @count: input size
185 : *
186 : * Allow PCI IDs to be added to an existing driver via sysfs.
187 : */
188 0 : static ssize_t new_id_store(struct device_driver *driver, const char *buf,
189 : size_t count)
190 : {
191 0 : struct pci_driver *pdrv = to_pci_driver(driver);
192 0 : const struct pci_device_id *ids = pdrv->id_table;
193 0 : u32 vendor, device, subvendor = PCI_ANY_ID,
194 0 : subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
195 0 : unsigned long driver_data = 0;
196 0 : int fields = 0;
197 0 : int retval = 0;
198 :
199 0 : fields = sscanf(buf, "%x %x %x %x %x %x %lx",
200 : &vendor, &device, &subvendor, &subdevice,
201 : &class, &class_mask, &driver_data);
202 0 : if (fields < 2)
203 : return -EINVAL;
204 :
205 0 : if (fields != 7) {
206 0 : struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
207 0 : if (!pdev)
208 : return -ENOMEM;
209 :
210 0 : pdev->vendor = vendor;
211 0 : pdev->device = device;
212 0 : pdev->subsystem_vendor = subvendor;
213 0 : pdev->subsystem_device = subdevice;
214 0 : pdev->class = class;
215 :
216 0 : if (pci_match_device(pdrv, pdev))
217 0 : retval = -EEXIST;
218 :
219 0 : kfree(pdev);
220 :
221 0 : if (retval)
222 0 : return retval;
223 : }
224 :
225 : /* Only accept driver_data values that match an existing id_table
226 : entry */
227 0 : if (ids) {
228 : retval = -EINVAL;
229 0 : while (ids->vendor || ids->subvendor || ids->class_mask) {
230 0 : if (driver_data == ids->driver_data) {
231 : retval = 0;
232 : break;
233 : }
234 0 : ids++;
235 : }
236 0 : if (retval) /* No match */
237 0 : return retval;
238 : }
239 :
240 0 : retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
241 : class, class_mask, driver_data);
242 0 : if (retval)
243 0 : return retval;
244 0 : return count;
245 : }
246 : static DRIVER_ATTR_WO(new_id);
247 :
248 : /**
249 : * remove_id_store - remove a PCI device ID from this driver
250 : * @driver: target device driver
251 : * @buf: buffer for scanning device ID data
252 : * @count: input size
253 : *
254 : * Removes a dynamic pci device ID to this driver.
255 : */
256 0 : static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
257 : size_t count)
258 : {
259 : struct pci_dynid *dynid, *n;
260 0 : struct pci_driver *pdrv = to_pci_driver(driver);
261 0 : u32 vendor, device, subvendor = PCI_ANY_ID,
262 0 : subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
263 0 : int fields = 0;
264 0 : size_t retval = -ENODEV;
265 :
266 0 : fields = sscanf(buf, "%x %x %x %x %x %x",
267 : &vendor, &device, &subvendor, &subdevice,
268 : &class, &class_mask);
269 0 : if (fields < 2)
270 : return -EINVAL;
271 :
272 0 : spin_lock(&pdrv->dynids.lock);
273 0 : list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
274 0 : struct pci_device_id *id = &dynid->id;
275 0 : if ((id->vendor == vendor) &&
276 0 : (id->device == device) &&
277 0 : (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
278 0 : (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
279 0 : !((id->class ^ class) & class_mask)) {
280 0 : list_del(&dynid->node);
281 0 : kfree(dynid);
282 0 : retval = count;
283 0 : break;
284 : }
285 : }
286 0 : spin_unlock(&pdrv->dynids.lock);
287 :
288 0 : return retval;
289 : }
290 : static DRIVER_ATTR_WO(remove_id);
291 :
292 : static struct attribute *pci_drv_attrs[] = {
293 : &driver_attr_new_id.attr,
294 : &driver_attr_remove_id.attr,
295 : NULL,
296 : };
297 : ATTRIBUTE_GROUPS(pci_drv);
298 :
299 : struct drv_dev_and_id {
300 : struct pci_driver *drv;
301 : struct pci_dev *dev;
302 : const struct pci_device_id *id;
303 : };
304 :
305 0 : static long local_pci_probe(void *_ddi)
306 : {
307 0 : struct drv_dev_and_id *ddi = _ddi;
308 0 : struct pci_dev *pci_dev = ddi->dev;
309 0 : struct pci_driver *pci_drv = ddi->drv;
310 0 : struct device *dev = &pci_dev->dev;
311 : int rc;
312 :
313 : /*
314 : * Unbound PCI devices are always put in D0, regardless of
315 : * runtime PM status. During probe, the device is set to
316 : * active and the usage count is incremented. If the driver
317 : * supports runtime PM, it should call pm_runtime_put_noidle(),
318 : * or any other runtime PM helper function decrementing the usage
319 : * count, in its probe routine and pm_runtime_get_noresume() in
320 : * its remove routine.
321 : */
322 0 : pm_runtime_get_sync(dev);
323 0 : pci_dev->driver = pci_drv;
324 0 : rc = pci_drv->probe(pci_dev, ddi->id);
325 0 : if (!rc)
326 0 : return rc;
327 0 : if (rc < 0) {
328 0 : pci_dev->driver = NULL;
329 0 : pm_runtime_put_sync(dev);
330 0 : return rc;
331 : }
332 : /*
333 : * Probe function should return < 0 for failure, 0 for success
334 : * Treat values > 0 as success, but warn.
335 : */
336 0 : pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
337 : rc);
338 0 : return 0;
339 : }
340 :
341 : static bool pci_physfn_is_probed(struct pci_dev *dev)
342 : {
343 : #ifdef CONFIG_PCI_IOV
344 : return dev->is_virtfn && dev->physfn->is_probed;
345 : #else
346 : return false;
347 : #endif
348 : }
349 :
350 : static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
351 : const struct pci_device_id *id)
352 : {
353 : int error, node, cpu;
354 0 : struct drv_dev_and_id ddi = { drv, dev, id };
355 :
356 : /*
357 : * Execute driver initialization on node where the device is
358 : * attached. This way the driver likely allocates its local memory
359 : * on the right node.
360 : */
361 0 : node = dev_to_node(&dev->dev);
362 0 : dev->is_probed = 1;
363 :
364 : cpu_hotplug_disable();
365 :
366 : /*
367 : * Prevent nesting work_on_cpu() for the case where a Virtual Function
368 : * device is probed from work_on_cpu() of the Physical device.
369 : */
370 : if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
371 : pci_physfn_is_probed(dev)) {
372 0 : cpu = nr_cpu_ids;
373 : } else {
374 : cpumask_var_t wq_domain_mask;
375 :
376 : if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
377 : error = -ENOMEM;
378 : goto out;
379 : }
380 : cpumask_and(wq_domain_mask,
381 : housekeeping_cpumask(HK_TYPE_WQ),
382 : housekeeping_cpumask(HK_TYPE_DOMAIN));
383 :
384 : cpu = cpumask_any_and(cpumask_of_node(node),
385 : wq_domain_mask);
386 : free_cpumask_var(wq_domain_mask);
387 : }
388 :
389 : if (cpu < nr_cpu_ids)
390 : error = work_on_cpu(cpu, local_pci_probe, &ddi);
391 : else
392 0 : error = local_pci_probe(&ddi);
393 : out:
394 0 : dev->is_probed = 0;
395 : cpu_hotplug_enable();
396 : return error;
397 : }
398 :
399 : /**
400 : * __pci_device_probe - check if a driver wants to claim a specific PCI device
401 : * @drv: driver to call to check if it wants the PCI device
402 : * @pci_dev: PCI device being probed
403 : *
404 : * returns 0 on success, else error.
405 : * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
406 : */
407 0 : static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
408 : {
409 : const struct pci_device_id *id;
410 0 : int error = 0;
411 :
412 0 : if (drv->probe) {
413 0 : error = -ENODEV;
414 :
415 0 : id = pci_match_device(drv, pci_dev);
416 0 : if (id)
417 0 : error = pci_call_probe(drv, pci_dev, id);
418 : }
419 0 : return error;
420 : }
421 :
422 0 : int __weak pcibios_alloc_irq(struct pci_dev *dev)
423 : {
424 0 : return 0;
425 : }
426 :
427 0 : void __weak pcibios_free_irq(struct pci_dev *dev)
428 : {
429 0 : }
430 :
431 : #ifdef CONFIG_PCI_IOV
432 : static inline bool pci_device_can_probe(struct pci_dev *pdev)
433 : {
434 : return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
435 : pdev->driver_override);
436 : }
437 : #else
438 : static inline bool pci_device_can_probe(struct pci_dev *pdev)
439 : {
440 : return true;
441 : }
442 : #endif
443 :
444 0 : static int pci_device_probe(struct device *dev)
445 : {
446 : int error;
447 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
448 0 : struct pci_driver *drv = to_pci_driver(dev->driver);
449 :
450 0 : if (!pci_device_can_probe(pci_dev))
451 : return -ENODEV;
452 :
453 0 : pci_assign_irq(pci_dev);
454 :
455 0 : error = pcibios_alloc_irq(pci_dev);
456 0 : if (error < 0)
457 : return error;
458 :
459 0 : pci_dev_get(pci_dev);
460 0 : error = __pci_device_probe(drv, pci_dev);
461 0 : if (error) {
462 0 : pcibios_free_irq(pci_dev);
463 : pci_dev_put(pci_dev);
464 : }
465 :
466 : return error;
467 : }
468 :
469 0 : static void pci_device_remove(struct device *dev)
470 : {
471 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
472 0 : struct pci_driver *drv = pci_dev->driver;
473 :
474 0 : if (drv->remove) {
475 0 : pm_runtime_get_sync(dev);
476 0 : drv->remove(pci_dev);
477 : pm_runtime_put_noidle(dev);
478 : }
479 0 : pcibios_free_irq(pci_dev);
480 0 : pci_dev->driver = NULL;
481 0 : pci_iov_remove(pci_dev);
482 :
483 : /* Undo the runtime PM settings in local_pci_probe() */
484 0 : pm_runtime_put_sync(dev);
485 :
486 : /*
487 : * If the device is still on, set the power state as "unknown",
488 : * since it might change by the next time we load the driver.
489 : */
490 0 : if (pci_dev->current_state == PCI_D0)
491 0 : pci_dev->current_state = PCI_UNKNOWN;
492 :
493 : /*
494 : * We would love to complain here if pci_dev->is_enabled is set, that
495 : * the driver should have called pci_disable_device(), but the
496 : * unfortunate fact is there are too many odd BIOS and bridge setups
497 : * that don't like drivers doing that all of the time.
498 : * Oh well, we can dream of sane hardware when we sleep, no matter how
499 : * horrible the crap we have to deal with is when we are awake...
500 : */
501 :
502 0 : pci_dev_put(pci_dev);
503 0 : }
504 :
505 0 : static void pci_device_shutdown(struct device *dev)
506 : {
507 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
508 0 : struct pci_driver *drv = pci_dev->driver;
509 :
510 0 : pm_runtime_resume(dev);
511 :
512 0 : if (drv && drv->shutdown)
513 0 : drv->shutdown(pci_dev);
514 :
515 : /*
516 : * If this is a kexec reboot, turn off Bus Master bit on the
517 : * device to tell it to not continue to do DMA. Don't touch
518 : * devices in D3cold or unknown states.
519 : * If it is not a kexec reboot, firmware will hit the PCI
520 : * devices with big hammer and stop their DMA any way.
521 : */
522 : if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
523 : pci_clear_master(pci_dev);
524 0 : }
525 :
526 : #ifdef CONFIG_PM_SLEEP
527 :
528 : /* Auxiliary functions used for system resume */
529 :
530 : /**
531 : * pci_restore_standard_config - restore standard config registers of PCI device
532 : * @pci_dev: PCI device to handle
533 : */
534 0 : static int pci_restore_standard_config(struct pci_dev *pci_dev)
535 : {
536 0 : pci_update_current_state(pci_dev, PCI_UNKNOWN);
537 :
538 0 : if (pci_dev->current_state != PCI_D0) {
539 0 : int error = pci_set_power_state(pci_dev, PCI_D0);
540 0 : if (error)
541 : return error;
542 : }
543 :
544 0 : pci_restore_state(pci_dev);
545 0 : pci_pme_restore(pci_dev);
546 0 : return 0;
547 : }
548 : #endif /* CONFIG_PM_SLEEP */
549 :
550 : #ifdef CONFIG_PM
551 :
552 : /* Auxiliary functions used for system resume and run-time resume */
553 :
554 0 : static void pci_pm_default_resume(struct pci_dev *pci_dev)
555 : {
556 0 : pci_fixup_device(pci_fixup_resume, pci_dev);
557 0 : pci_enable_wake(pci_dev, PCI_D0, false);
558 0 : }
559 :
560 : static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev)
561 : {
562 0 : pci_power_up(pci_dev);
563 0 : pci_update_current_state(pci_dev, PCI_D0);
564 : }
565 :
566 0 : static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
567 : {
568 0 : pci_pm_power_up_and_verify_state(pci_dev);
569 0 : pci_restore_state(pci_dev);
570 0 : pci_pme_restore(pci_dev);
571 0 : }
572 :
573 0 : static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev)
574 : {
575 0 : pci_bridge_wait_for_secondary_bus(pci_dev, "resume", PCI_RESET_WAIT);
576 : /*
577 : * When powering on a bridge from D3cold, the whole hierarchy may be
578 : * powered on into D0uninitialized state, resume them to give them a
579 : * chance to suspend again
580 : */
581 0 : pci_resume_bus(pci_dev->subordinate);
582 0 : }
583 :
584 : #endif /* CONFIG_PM */
585 :
586 : #ifdef CONFIG_PM_SLEEP
587 :
588 : /*
589 : * Default "suspend" method for devices that have no driver provided suspend,
590 : * or not even a driver at all (second part).
591 : */
592 : static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
593 : {
594 : /*
595 : * mark its power state as "unknown", since we don't know if
596 : * e.g. the BIOS will change its device state when we suspend.
597 : */
598 0 : if (pci_dev->current_state == PCI_D0)
599 0 : pci_dev->current_state = PCI_UNKNOWN;
600 : }
601 :
602 : /*
603 : * Default "resume" method for devices that have no driver provided resume,
604 : * or not even a driver at all (second part).
605 : */
606 0 : static int pci_pm_reenable_device(struct pci_dev *pci_dev)
607 : {
608 : int retval;
609 :
610 : /* if the device was enabled before suspend, re-enable */
611 0 : retval = pci_reenable_device(pci_dev);
612 : /*
613 : * if the device was busmaster before the suspend, make it busmaster
614 : * again
615 : */
616 0 : if (pci_dev->is_busmaster)
617 0 : pci_set_master(pci_dev);
618 :
619 0 : return retval;
620 : }
621 :
622 0 : static int pci_legacy_suspend(struct device *dev, pm_message_t state)
623 : {
624 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
625 0 : struct pci_driver *drv = pci_dev->driver;
626 :
627 0 : if (drv && drv->suspend) {
628 0 : pci_power_t prev = pci_dev->current_state;
629 : int error;
630 :
631 0 : error = drv->suspend(pci_dev, state);
632 0 : suspend_report_result(dev, drv->suspend, error);
633 0 : if (error)
634 : return error;
635 :
636 0 : if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
637 0 : && pci_dev->current_state != PCI_UNKNOWN) {
638 0 : pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
639 : "PCI PM: Device state not saved by %pS\n",
640 : drv->suspend);
641 : }
642 : }
643 :
644 0 : pci_fixup_device(pci_fixup_suspend, pci_dev);
645 :
646 0 : return 0;
647 : }
648 :
649 0 : static int pci_legacy_suspend_late(struct device *dev)
650 : {
651 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
652 :
653 0 : if (!pci_dev->state_saved)
654 0 : pci_save_state(pci_dev);
655 :
656 0 : pci_pm_set_unknown_state(pci_dev);
657 :
658 0 : pci_fixup_device(pci_fixup_suspend_late, pci_dev);
659 :
660 0 : return 0;
661 : }
662 :
663 0 : static int pci_legacy_resume(struct device *dev)
664 : {
665 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
666 0 : struct pci_driver *drv = pci_dev->driver;
667 :
668 0 : pci_fixup_device(pci_fixup_resume, pci_dev);
669 :
670 0 : return drv && drv->resume ?
671 0 : drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
672 : }
673 :
674 : /* Auxiliary functions used by the new power management framework */
675 :
676 : static void pci_pm_default_suspend(struct pci_dev *pci_dev)
677 : {
678 : /* Disable non-bridge devices without PM support */
679 0 : if (!pci_has_subordinate(pci_dev))
680 0 : pci_disable_enabled_device(pci_dev);
681 : }
682 :
683 0 : static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
684 : {
685 0 : struct pci_driver *drv = pci_dev->driver;
686 0 : bool ret = drv && (drv->suspend || drv->resume);
687 :
688 : /*
689 : * Legacy PM support is used by default, so warn if the new framework is
690 : * supported as well. Drivers are supposed to support either the
691 : * former, or the latter, but not both at the same time.
692 : */
693 0 : pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
694 : pci_dev->vendor, pci_dev->device);
695 :
696 0 : return ret;
697 : }
698 :
699 : /* New power management framework */
700 :
701 0 : static int pci_pm_prepare(struct device *dev)
702 : {
703 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
704 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
705 :
706 0 : if (pm && pm->prepare) {
707 0 : int error = pm->prepare(dev);
708 0 : if (error < 0)
709 : return error;
710 :
711 0 : if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
712 : return 0;
713 : }
714 0 : if (pci_dev_need_resume(pci_dev))
715 : return 0;
716 :
717 : /*
718 : * The PME setting needs to be adjusted here in case the direct-complete
719 : * optimization is used with respect to this device.
720 : */
721 0 : pci_dev_adjust_pme(pci_dev);
722 0 : return 1;
723 : }
724 :
725 0 : static void pci_pm_complete(struct device *dev)
726 : {
727 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
728 :
729 0 : pci_dev_complete_resume(pci_dev);
730 0 : pm_generic_complete(dev);
731 :
732 : /* Resume device if platform firmware has put it in reset-power-on */
733 0 : if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
734 0 : pci_power_t pre_sleep_state = pci_dev->current_state;
735 :
736 0 : pci_refresh_power_state(pci_dev);
737 : /*
738 : * On platforms with ACPI this check may also trigger for
739 : * devices sharing power resources if one of those power
740 : * resources has been activated as a result of a change of the
741 : * power state of another device sharing it. However, in that
742 : * case it is also better to resume the device, in general.
743 : */
744 0 : if (pci_dev->current_state < pre_sleep_state)
745 : pm_request_resume(dev);
746 : }
747 0 : }
748 :
749 : #else /* !CONFIG_PM_SLEEP */
750 :
751 : #define pci_pm_prepare NULL
752 : #define pci_pm_complete NULL
753 :
754 : #endif /* !CONFIG_PM_SLEEP */
755 :
756 : #ifdef CONFIG_SUSPEND
757 0 : static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
758 : {
759 : /*
760 : * Some BIOSes forget to clear Root PME Status bits after system
761 : * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
762 : * Clear those bits now just in case (shouldn't hurt).
763 : */
764 0 : if (pci_is_pcie(pci_dev) &&
765 0 : (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
766 0 : pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
767 0 : pcie_clear_root_pme_status(pci_dev);
768 0 : }
769 :
770 0 : static int pci_pm_suspend(struct device *dev)
771 : {
772 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
773 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
774 :
775 0 : pci_dev->skip_bus_pm = false;
776 :
777 : /*
778 : * Disabling PTM allows some systems, e.g., Intel mobile chips
779 : * since Coffee Lake, to enter a lower-power PM state.
780 : */
781 0 : pci_suspend_ptm(pci_dev);
782 :
783 0 : if (pci_has_legacy_pm_support(pci_dev))
784 0 : return pci_legacy_suspend(dev, PMSG_SUSPEND);
785 :
786 0 : if (!pm) {
787 : pci_pm_default_suspend(pci_dev);
788 : return 0;
789 : }
790 :
791 : /*
792 : * PCI devices suspended at run time may need to be resumed at this
793 : * point, because in general it may be necessary to reconfigure them for
794 : * system suspend. Namely, if the device is expected to wake up the
795 : * system from the sleep state, it may have to be reconfigured for this
796 : * purpose, or if the device is not expected to wake up the system from
797 : * the sleep state, it should be prevented from signaling wakeup events
798 : * going forward.
799 : *
800 : * Also if the driver of the device does not indicate that its system
801 : * suspend callbacks can cope with runtime-suspended devices, it is
802 : * better to resume the device from runtime suspend here.
803 : */
804 0 : if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
805 0 : pci_dev_need_resume(pci_dev)) {
806 0 : pm_runtime_resume(dev);
807 0 : pci_dev->state_saved = false;
808 : } else {
809 0 : pci_dev_adjust_pme(pci_dev);
810 : }
811 :
812 0 : if (pm->suspend) {
813 0 : pci_power_t prev = pci_dev->current_state;
814 : int error;
815 :
816 0 : error = pm->suspend(dev);
817 0 : suspend_report_result(dev, pm->suspend, error);
818 0 : if (error)
819 : return error;
820 :
821 0 : if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
822 0 : && pci_dev->current_state != PCI_UNKNOWN) {
823 0 : pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
824 : "PCI PM: State of device not saved by %pS\n",
825 : pm->suspend);
826 : }
827 : }
828 :
829 : return 0;
830 : }
831 :
832 0 : static int pci_pm_suspend_late(struct device *dev)
833 : {
834 0 : if (dev_pm_skip_suspend(dev))
835 : return 0;
836 :
837 0 : pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
838 :
839 0 : return pm_generic_suspend_late(dev);
840 : }
841 :
842 0 : static int pci_pm_suspend_noirq(struct device *dev)
843 : {
844 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
845 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
846 :
847 0 : if (dev_pm_skip_suspend(dev))
848 : return 0;
849 :
850 0 : if (pci_has_legacy_pm_support(pci_dev))
851 0 : return pci_legacy_suspend_late(dev);
852 :
853 0 : if (!pm) {
854 0 : pci_save_state(pci_dev);
855 0 : goto Fixup;
856 : }
857 :
858 0 : if (pm->suspend_noirq) {
859 0 : pci_power_t prev = pci_dev->current_state;
860 : int error;
861 :
862 0 : error = pm->suspend_noirq(dev);
863 0 : suspend_report_result(dev, pm->suspend_noirq, error);
864 0 : if (error)
865 : return error;
866 :
867 0 : if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
868 0 : && pci_dev->current_state != PCI_UNKNOWN) {
869 0 : pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
870 : "PCI PM: State of device not saved by %pS\n",
871 : pm->suspend_noirq);
872 : goto Fixup;
873 : }
874 : }
875 :
876 0 : if (!pci_dev->state_saved) {
877 0 : pci_save_state(pci_dev);
878 :
879 : /*
880 : * If the device is a bridge with a child in D0 below it,
881 : * it needs to stay in D0, so check skip_bus_pm to avoid
882 : * putting it into a low-power state in that case.
883 : */
884 0 : if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
885 0 : pci_prepare_to_sleep(pci_dev);
886 : }
887 :
888 : pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
889 : pci_power_name(pci_dev->current_state));
890 :
891 0 : if (pci_dev->current_state == PCI_D0) {
892 0 : pci_dev->skip_bus_pm = true;
893 : /*
894 : * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
895 : * downstream device is in D0, so avoid changing the power state
896 : * of the parent bridge by setting the skip_bus_pm flag for it.
897 : */
898 0 : if (pci_dev->bus->self)
899 0 : pci_dev->bus->self->skip_bus_pm = true;
900 : }
901 :
902 0 : if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
903 : pci_dbg(pci_dev, "PCI PM: Skipped\n");
904 : goto Fixup;
905 : }
906 :
907 0 : pci_pm_set_unknown_state(pci_dev);
908 :
909 : /*
910 : * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
911 : * PCI COMMAND register isn't 0, the BIOS assumes that the controller
912 : * hasn't been quiesced and tries to turn it off. If the controller
913 : * is already in D3, this can hang or cause memory corruption.
914 : *
915 : * Since the value of the COMMAND register doesn't matter once the
916 : * device has been suspended, we can safely set it to 0 here.
917 : */
918 0 : if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
919 0 : pci_write_config_word(pci_dev, PCI_COMMAND, 0);
920 :
921 : Fixup:
922 0 : pci_fixup_device(pci_fixup_suspend_late, pci_dev);
923 :
924 : /*
925 : * If the target system sleep state is suspend-to-idle, it is sufficient
926 : * to check whether or not the device's wakeup settings are good for
927 : * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
928 : * pci_pm_complete() to take care of fixing up the device's state
929 : * anyway, if need be.
930 : */
931 0 : if (device_can_wakeup(dev) && !device_may_wakeup(dev))
932 0 : dev->power.may_skip_resume = false;
933 :
934 : return 0;
935 : }
936 :
937 0 : static int pci_pm_resume_noirq(struct device *dev)
938 : {
939 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
940 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
941 0 : pci_power_t prev_state = pci_dev->current_state;
942 0 : bool skip_bus_pm = pci_dev->skip_bus_pm;
943 :
944 0 : if (dev_pm_skip_resume(dev))
945 : return 0;
946 :
947 : /*
948 : * In the suspend-to-idle case, devices left in D0 during suspend will
949 : * stay in D0, so it is not necessary to restore or update their
950 : * configuration here and attempting to put them into D0 again is
951 : * pointless, so avoid doing that.
952 : */
953 0 : if (!(skip_bus_pm && pm_suspend_no_platform()))
954 0 : pci_pm_default_resume_early(pci_dev);
955 :
956 0 : pci_fixup_device(pci_fixup_resume_early, pci_dev);
957 0 : pcie_pme_root_status_cleanup(pci_dev);
958 :
959 0 : if (!skip_bus_pm && prev_state == PCI_D3cold)
960 0 : pci_pm_bridge_power_up_actions(pci_dev);
961 :
962 0 : if (pci_has_legacy_pm_support(pci_dev))
963 : return 0;
964 :
965 0 : if (pm && pm->resume_noirq)
966 0 : return pm->resume_noirq(dev);
967 :
968 : return 0;
969 : }
970 :
971 0 : static int pci_pm_resume_early(struct device *dev)
972 : {
973 0 : if (dev_pm_skip_resume(dev))
974 : return 0;
975 :
976 0 : return pm_generic_resume_early(dev);
977 : }
978 :
979 0 : static int pci_pm_resume(struct device *dev)
980 : {
981 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
982 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
983 :
984 : /*
985 : * This is necessary for the suspend error path in which resume is
986 : * called without restoring the standard config registers of the device.
987 : */
988 0 : if (pci_dev->state_saved)
989 0 : pci_restore_standard_config(pci_dev);
990 :
991 0 : pci_resume_ptm(pci_dev);
992 :
993 0 : if (pci_has_legacy_pm_support(pci_dev))
994 0 : return pci_legacy_resume(dev);
995 :
996 0 : pci_pm_default_resume(pci_dev);
997 :
998 0 : if (pm) {
999 0 : if (pm->resume)
1000 0 : return pm->resume(dev);
1001 : } else {
1002 0 : pci_pm_reenable_device(pci_dev);
1003 : }
1004 :
1005 : return 0;
1006 : }
1007 :
1008 : #else /* !CONFIG_SUSPEND */
1009 :
1010 : #define pci_pm_suspend NULL
1011 : #define pci_pm_suspend_late NULL
1012 : #define pci_pm_suspend_noirq NULL
1013 : #define pci_pm_resume NULL
1014 : #define pci_pm_resume_early NULL
1015 : #define pci_pm_resume_noirq NULL
1016 :
1017 : #endif /* !CONFIG_SUSPEND */
1018 :
1019 : #ifdef CONFIG_HIBERNATE_CALLBACKS
1020 :
1021 : static int pci_pm_freeze(struct device *dev)
1022 : {
1023 : struct pci_dev *pci_dev = to_pci_dev(dev);
1024 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1025 :
1026 : if (pci_has_legacy_pm_support(pci_dev))
1027 : return pci_legacy_suspend(dev, PMSG_FREEZE);
1028 :
1029 : if (!pm) {
1030 : pci_pm_default_suspend(pci_dev);
1031 : return 0;
1032 : }
1033 :
1034 : /*
1035 : * Resume all runtime-suspended devices before creating a snapshot
1036 : * image of system memory, because the restore kernel generally cannot
1037 : * be expected to always handle them consistently and they need to be
1038 : * put into the runtime-active metastate during system resume anyway,
1039 : * so it is better to ensure that the state saved in the image will be
1040 : * always consistent with that.
1041 : */
1042 : pm_runtime_resume(dev);
1043 : pci_dev->state_saved = false;
1044 :
1045 : if (pm->freeze) {
1046 : int error;
1047 :
1048 : error = pm->freeze(dev);
1049 : suspend_report_result(dev, pm->freeze, error);
1050 : if (error)
1051 : return error;
1052 : }
1053 :
1054 : return 0;
1055 : }
1056 :
1057 : static int pci_pm_freeze_noirq(struct device *dev)
1058 : {
1059 : struct pci_dev *pci_dev = to_pci_dev(dev);
1060 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1061 :
1062 : if (pci_has_legacy_pm_support(pci_dev))
1063 : return pci_legacy_suspend_late(dev);
1064 :
1065 : if (pm && pm->freeze_noirq) {
1066 : int error;
1067 :
1068 : error = pm->freeze_noirq(dev);
1069 : suspend_report_result(dev, pm->freeze_noirq, error);
1070 : if (error)
1071 : return error;
1072 : }
1073 :
1074 : if (!pci_dev->state_saved)
1075 : pci_save_state(pci_dev);
1076 :
1077 : pci_pm_set_unknown_state(pci_dev);
1078 :
1079 : return 0;
1080 : }
1081 :
1082 : static int pci_pm_thaw_noirq(struct device *dev)
1083 : {
1084 : struct pci_dev *pci_dev = to_pci_dev(dev);
1085 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1086 :
1087 : /*
1088 : * The pm->thaw_noirq() callback assumes the device has been
1089 : * returned to D0 and its config state has been restored.
1090 : *
1091 : * In addition, pci_restore_state() restores MSI-X state in MMIO
1092 : * space, which requires the device to be in D0, so return it to D0
1093 : * in case the driver's "freeze" callbacks put it into a low-power
1094 : * state.
1095 : */
1096 : pci_pm_power_up_and_verify_state(pci_dev);
1097 : pci_restore_state(pci_dev);
1098 :
1099 : if (pci_has_legacy_pm_support(pci_dev))
1100 : return 0;
1101 :
1102 : if (pm && pm->thaw_noirq)
1103 : return pm->thaw_noirq(dev);
1104 :
1105 : return 0;
1106 : }
1107 :
1108 : static int pci_pm_thaw(struct device *dev)
1109 : {
1110 : struct pci_dev *pci_dev = to_pci_dev(dev);
1111 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1112 : int error = 0;
1113 :
1114 : if (pci_has_legacy_pm_support(pci_dev))
1115 : return pci_legacy_resume(dev);
1116 :
1117 : if (pm) {
1118 : if (pm->thaw)
1119 : error = pm->thaw(dev);
1120 : } else {
1121 : pci_pm_reenable_device(pci_dev);
1122 : }
1123 :
1124 : pci_dev->state_saved = false;
1125 :
1126 : return error;
1127 : }
1128 :
1129 : static int pci_pm_poweroff(struct device *dev)
1130 : {
1131 : struct pci_dev *pci_dev = to_pci_dev(dev);
1132 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1133 :
1134 : if (pci_has_legacy_pm_support(pci_dev))
1135 : return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1136 :
1137 : if (!pm) {
1138 : pci_pm_default_suspend(pci_dev);
1139 : return 0;
1140 : }
1141 :
1142 : /* The reason to do that is the same as in pci_pm_suspend(). */
1143 : if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1144 : pci_dev_need_resume(pci_dev)) {
1145 : pm_runtime_resume(dev);
1146 : pci_dev->state_saved = false;
1147 : } else {
1148 : pci_dev_adjust_pme(pci_dev);
1149 : }
1150 :
1151 : if (pm->poweroff) {
1152 : int error;
1153 :
1154 : error = pm->poweroff(dev);
1155 : suspend_report_result(dev, pm->poweroff, error);
1156 : if (error)
1157 : return error;
1158 : }
1159 :
1160 : return 0;
1161 : }
1162 :
1163 : static int pci_pm_poweroff_late(struct device *dev)
1164 : {
1165 : if (dev_pm_skip_suspend(dev))
1166 : return 0;
1167 :
1168 : pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1169 :
1170 : return pm_generic_poweroff_late(dev);
1171 : }
1172 :
1173 : static int pci_pm_poweroff_noirq(struct device *dev)
1174 : {
1175 : struct pci_dev *pci_dev = to_pci_dev(dev);
1176 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1177 :
1178 : if (dev_pm_skip_suspend(dev))
1179 : return 0;
1180 :
1181 : if (pci_has_legacy_pm_support(pci_dev))
1182 : return pci_legacy_suspend_late(dev);
1183 :
1184 : if (!pm) {
1185 : pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1186 : return 0;
1187 : }
1188 :
1189 : if (pm->poweroff_noirq) {
1190 : int error;
1191 :
1192 : error = pm->poweroff_noirq(dev);
1193 : suspend_report_result(dev, pm->poweroff_noirq, error);
1194 : if (error)
1195 : return error;
1196 : }
1197 :
1198 : if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1199 : pci_prepare_to_sleep(pci_dev);
1200 :
1201 : /*
1202 : * The reason for doing this here is the same as for the analogous code
1203 : * in pci_pm_suspend_noirq().
1204 : */
1205 : if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1206 : pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1207 :
1208 : pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1209 :
1210 : return 0;
1211 : }
1212 :
1213 : static int pci_pm_restore_noirq(struct device *dev)
1214 : {
1215 : struct pci_dev *pci_dev = to_pci_dev(dev);
1216 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1217 :
1218 : pci_pm_default_resume_early(pci_dev);
1219 : pci_fixup_device(pci_fixup_resume_early, pci_dev);
1220 :
1221 : if (pci_has_legacy_pm_support(pci_dev))
1222 : return 0;
1223 :
1224 : if (pm && pm->restore_noirq)
1225 : return pm->restore_noirq(dev);
1226 :
1227 : return 0;
1228 : }
1229 :
1230 : static int pci_pm_restore(struct device *dev)
1231 : {
1232 : struct pci_dev *pci_dev = to_pci_dev(dev);
1233 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1234 :
1235 : /*
1236 : * This is necessary for the hibernation error path in which restore is
1237 : * called without restoring the standard config registers of the device.
1238 : */
1239 : if (pci_dev->state_saved)
1240 : pci_restore_standard_config(pci_dev);
1241 :
1242 : if (pci_has_legacy_pm_support(pci_dev))
1243 : return pci_legacy_resume(dev);
1244 :
1245 : pci_pm_default_resume(pci_dev);
1246 :
1247 : if (pm) {
1248 : if (pm->restore)
1249 : return pm->restore(dev);
1250 : } else {
1251 : pci_pm_reenable_device(pci_dev);
1252 : }
1253 :
1254 : return 0;
1255 : }
1256 :
1257 : #else /* !CONFIG_HIBERNATE_CALLBACKS */
1258 :
1259 : #define pci_pm_freeze NULL
1260 : #define pci_pm_freeze_noirq NULL
1261 : #define pci_pm_thaw NULL
1262 : #define pci_pm_thaw_noirq NULL
1263 : #define pci_pm_poweroff NULL
1264 : #define pci_pm_poweroff_late NULL
1265 : #define pci_pm_poweroff_noirq NULL
1266 : #define pci_pm_restore NULL
1267 : #define pci_pm_restore_noirq NULL
1268 :
1269 : #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1270 :
1271 : #ifdef CONFIG_PM
1272 :
1273 0 : static int pci_pm_runtime_suspend(struct device *dev)
1274 : {
1275 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
1276 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1277 0 : pci_power_t prev = pci_dev->current_state;
1278 : int error;
1279 :
1280 0 : pci_suspend_ptm(pci_dev);
1281 :
1282 : /*
1283 : * If pci_dev->driver is not set (unbound), we leave the device in D0,
1284 : * but it may go to D3cold when the bridge above it runtime suspends.
1285 : * Save its config space in case that happens.
1286 : */
1287 0 : if (!pci_dev->driver) {
1288 0 : pci_save_state(pci_dev);
1289 0 : return 0;
1290 : }
1291 :
1292 0 : pci_dev->state_saved = false;
1293 0 : if (pm && pm->runtime_suspend) {
1294 0 : error = pm->runtime_suspend(dev);
1295 : /*
1296 : * -EBUSY and -EAGAIN is used to request the runtime PM core
1297 : * to schedule a new suspend, so log the event only with debug
1298 : * log level.
1299 : */
1300 0 : if (error == -EBUSY || error == -EAGAIN) {
1301 : pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1302 : pm->runtime_suspend, error);
1303 : return error;
1304 0 : } else if (error) {
1305 0 : pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1306 : pm->runtime_suspend, error);
1307 0 : return error;
1308 : }
1309 : }
1310 :
1311 0 : pci_fixup_device(pci_fixup_suspend, pci_dev);
1312 :
1313 0 : if (pm && pm->runtime_suspend
1314 0 : && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1315 0 : && pci_dev->current_state != PCI_UNKNOWN) {
1316 0 : pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1317 : "PCI PM: State of device not saved by %pS\n",
1318 : pm->runtime_suspend);
1319 : return 0;
1320 : }
1321 :
1322 0 : if (!pci_dev->state_saved) {
1323 0 : pci_save_state(pci_dev);
1324 0 : pci_finish_runtime_suspend(pci_dev);
1325 : }
1326 :
1327 : return 0;
1328 : }
1329 :
1330 0 : static int pci_pm_runtime_resume(struct device *dev)
1331 : {
1332 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
1333 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1334 0 : pci_power_t prev_state = pci_dev->current_state;
1335 0 : int error = 0;
1336 :
1337 : /*
1338 : * Restoring config space is necessary even if the device is not bound
1339 : * to a driver because although we left it in D0, it may have gone to
1340 : * D3cold when the bridge above it runtime suspended.
1341 : */
1342 0 : pci_pm_default_resume_early(pci_dev);
1343 0 : pci_resume_ptm(pci_dev);
1344 :
1345 0 : if (!pci_dev->driver)
1346 : return 0;
1347 :
1348 0 : pci_fixup_device(pci_fixup_resume_early, pci_dev);
1349 0 : pci_pm_default_resume(pci_dev);
1350 :
1351 0 : if (prev_state == PCI_D3cold)
1352 0 : pci_pm_bridge_power_up_actions(pci_dev);
1353 :
1354 0 : if (pm && pm->runtime_resume)
1355 0 : error = pm->runtime_resume(dev);
1356 :
1357 : return error;
1358 : }
1359 :
1360 0 : static int pci_pm_runtime_idle(struct device *dev)
1361 : {
1362 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
1363 0 : const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1364 :
1365 : /*
1366 : * If pci_dev->driver is not set (unbound), the device should
1367 : * always remain in D0 regardless of the runtime PM status
1368 : */
1369 0 : if (!pci_dev->driver)
1370 : return 0;
1371 :
1372 0 : if (!pm)
1373 : return -ENOSYS;
1374 :
1375 0 : if (pm->runtime_idle)
1376 0 : return pm->runtime_idle(dev);
1377 :
1378 : return 0;
1379 : }
1380 :
1381 : static const struct dev_pm_ops pci_dev_pm_ops = {
1382 : .prepare = pci_pm_prepare,
1383 : .complete = pci_pm_complete,
1384 : .suspend = pci_pm_suspend,
1385 : .suspend_late = pci_pm_suspend_late,
1386 : .resume = pci_pm_resume,
1387 : .resume_early = pci_pm_resume_early,
1388 : .freeze = pci_pm_freeze,
1389 : .thaw = pci_pm_thaw,
1390 : .poweroff = pci_pm_poweroff,
1391 : .poweroff_late = pci_pm_poweroff_late,
1392 : .restore = pci_pm_restore,
1393 : .suspend_noirq = pci_pm_suspend_noirq,
1394 : .resume_noirq = pci_pm_resume_noirq,
1395 : .freeze_noirq = pci_pm_freeze_noirq,
1396 : .thaw_noirq = pci_pm_thaw_noirq,
1397 : .poweroff_noirq = pci_pm_poweroff_noirq,
1398 : .restore_noirq = pci_pm_restore_noirq,
1399 : .runtime_suspend = pci_pm_runtime_suspend,
1400 : .runtime_resume = pci_pm_runtime_resume,
1401 : .runtime_idle = pci_pm_runtime_idle,
1402 : };
1403 :
1404 : #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1405 :
1406 : #else /* !CONFIG_PM */
1407 :
1408 : #define pci_pm_runtime_suspend NULL
1409 : #define pci_pm_runtime_resume NULL
1410 : #define pci_pm_runtime_idle NULL
1411 :
1412 : #define PCI_PM_OPS_PTR NULL
1413 :
1414 : #endif /* !CONFIG_PM */
1415 :
1416 : /**
1417 : * __pci_register_driver - register a new pci driver
1418 : * @drv: the driver structure to register
1419 : * @owner: owner module of drv
1420 : * @mod_name: module name string
1421 : *
1422 : * Adds the driver structure to the list of registered drivers.
1423 : * Returns a negative value on error, otherwise 0.
1424 : * If no error occurred, the driver remains registered even if
1425 : * no device was claimed during registration.
1426 : */
1427 0 : int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1428 : const char *mod_name)
1429 : {
1430 : /* initialize common driver fields */
1431 0 : drv->driver.name = drv->name;
1432 0 : drv->driver.bus = &pci_bus_type;
1433 0 : drv->driver.owner = owner;
1434 0 : drv->driver.mod_name = mod_name;
1435 0 : drv->driver.groups = drv->groups;
1436 0 : drv->driver.dev_groups = drv->dev_groups;
1437 :
1438 0 : spin_lock_init(&drv->dynids.lock);
1439 0 : INIT_LIST_HEAD(&drv->dynids.list);
1440 :
1441 : /* register with core */
1442 0 : return driver_register(&drv->driver);
1443 : }
1444 : EXPORT_SYMBOL(__pci_register_driver);
1445 :
1446 : /**
1447 : * pci_unregister_driver - unregister a pci driver
1448 : * @drv: the driver structure to unregister
1449 : *
1450 : * Deletes the driver structure from the list of registered PCI drivers,
1451 : * gives it a chance to clean up by calling its remove() function for
1452 : * each device it was responsible for, and marks those devices as
1453 : * driverless.
1454 : */
1455 :
1456 0 : void pci_unregister_driver(struct pci_driver *drv)
1457 : {
1458 0 : driver_unregister(&drv->driver);
1459 0 : pci_free_dynids(drv);
1460 0 : }
1461 : EXPORT_SYMBOL(pci_unregister_driver);
1462 :
1463 : static struct pci_driver pci_compat_driver = {
1464 : .name = "compat"
1465 : };
1466 :
1467 : /**
1468 : * pci_dev_driver - get the pci_driver of a device
1469 : * @dev: the device to query
1470 : *
1471 : * Returns the appropriate pci_driver structure or %NULL if there is no
1472 : * registered driver for the device.
1473 : */
1474 0 : struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1475 : {
1476 0 : if (dev->driver)
1477 : return dev->driver;
1478 : else {
1479 : int i;
1480 0 : for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1481 0 : if (dev->resource[i].flags & IORESOURCE_BUSY)
1482 : return &pci_compat_driver;
1483 : }
1484 : return NULL;
1485 : }
1486 : EXPORT_SYMBOL(pci_dev_driver);
1487 :
1488 : /**
1489 : * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1490 : * @dev: the PCI device structure to match against
1491 : * @drv: the device driver to search for matching PCI device id structures
1492 : *
1493 : * Used by a driver to check whether a PCI device present in the
1494 : * system is in its list of supported devices. Returns the matching
1495 : * pci_device_id structure or %NULL if there is no match.
1496 : */
1497 0 : static int pci_bus_match(struct device *dev, struct device_driver *drv)
1498 : {
1499 0 : struct pci_dev *pci_dev = to_pci_dev(dev);
1500 : struct pci_driver *pci_drv;
1501 : const struct pci_device_id *found_id;
1502 :
1503 0 : if (!pci_dev->match_driver)
1504 : return 0;
1505 :
1506 0 : pci_drv = to_pci_driver(drv);
1507 0 : found_id = pci_match_device(pci_drv, pci_dev);
1508 0 : if (found_id)
1509 : return 1;
1510 :
1511 0 : return 0;
1512 : }
1513 :
1514 : /**
1515 : * pci_dev_get - increments the reference count of the pci device structure
1516 : * @dev: the device being referenced
1517 : *
1518 : * Each live reference to a device should be refcounted.
1519 : *
1520 : * Drivers for PCI devices should normally record such references in
1521 : * their probe() methods, when they bind to a device, and release
1522 : * them by calling pci_dev_put(), in their disconnect() methods.
1523 : *
1524 : * A pointer to the device with the incremented reference counter is returned.
1525 : */
1526 0 : struct pci_dev *pci_dev_get(struct pci_dev *dev)
1527 : {
1528 0 : if (dev)
1529 0 : get_device(&dev->dev);
1530 0 : return dev;
1531 : }
1532 : EXPORT_SYMBOL(pci_dev_get);
1533 :
1534 : /**
1535 : * pci_dev_put - release a use of the pci device structure
1536 : * @dev: device that's been disconnected
1537 : *
1538 : * Must be called when a user of a device is finished with it. When the last
1539 : * user of the device calls this function, the memory of the device is freed.
1540 : */
1541 4 : void pci_dev_put(struct pci_dev *dev)
1542 : {
1543 4 : if (dev)
1544 0 : put_device(&dev->dev);
1545 4 : }
1546 : EXPORT_SYMBOL(pci_dev_put);
1547 :
1548 0 : static int pci_uevent(const struct device *dev, struct kobj_uevent_env *env)
1549 : {
1550 : const struct pci_dev *pdev;
1551 :
1552 0 : if (!dev)
1553 : return -ENODEV;
1554 :
1555 0 : pdev = to_pci_dev(dev);
1556 :
1557 0 : if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1558 : return -ENOMEM;
1559 :
1560 0 : if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1561 : return -ENOMEM;
1562 :
1563 0 : if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1564 0 : pdev->subsystem_device))
1565 : return -ENOMEM;
1566 :
1567 0 : if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1568 : return -ENOMEM;
1569 :
1570 0 : if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1571 0 : pdev->vendor, pdev->device,
1572 0 : pdev->subsystem_vendor, pdev->subsystem_device,
1573 0 : (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1574 0 : (u8)(pdev->class)))
1575 : return -ENOMEM;
1576 :
1577 0 : return 0;
1578 : }
1579 :
1580 : #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1581 : /**
1582 : * pci_uevent_ers - emit a uevent during recovery path of PCI device
1583 : * @pdev: PCI device undergoing error recovery
1584 : * @err_type: type of error event
1585 : */
1586 : void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1587 : {
1588 : int idx = 0;
1589 : char *envp[3];
1590 :
1591 : switch (err_type) {
1592 : case PCI_ERS_RESULT_NONE:
1593 : case PCI_ERS_RESULT_CAN_RECOVER:
1594 : envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1595 : envp[idx++] = "DEVICE_ONLINE=0";
1596 : break;
1597 : case PCI_ERS_RESULT_RECOVERED:
1598 : envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1599 : envp[idx++] = "DEVICE_ONLINE=1";
1600 : break;
1601 : case PCI_ERS_RESULT_DISCONNECT:
1602 : envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1603 : envp[idx++] = "DEVICE_ONLINE=0";
1604 : break;
1605 : default:
1606 : break;
1607 : }
1608 :
1609 : if (idx > 0) {
1610 : envp[idx++] = NULL;
1611 : kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1612 : }
1613 : }
1614 : #endif
1615 :
1616 0 : static int pci_bus_num_vf(struct device *dev)
1617 : {
1618 0 : return pci_num_vf(to_pci_dev(dev));
1619 : }
1620 :
1621 : /**
1622 : * pci_dma_configure - Setup DMA configuration
1623 : * @dev: ptr to dev structure
1624 : *
1625 : * Function to update PCI devices's DMA configuration using the same
1626 : * info from the OF node or ACPI node of host bridge's parent (if any).
1627 : */
1628 0 : static int pci_dma_configure(struct device *dev)
1629 : {
1630 0 : struct pci_driver *driver = to_pci_driver(dev->driver);
1631 : struct device *bridge;
1632 0 : int ret = 0;
1633 :
1634 0 : bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1635 :
1636 : if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1637 : bridge->parent->of_node) {
1638 : ret = of_dma_configure(dev, bridge->parent->of_node, true);
1639 0 : } else if (has_acpi_companion(bridge)) {
1640 : struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1641 :
1642 : ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1643 : }
1644 :
1645 0 : pci_put_host_bridge_device(bridge);
1646 :
1647 : if (!ret && !driver->driver_managed_dma) {
1648 : ret = iommu_device_use_default_domain(dev);
1649 : if (ret)
1650 : arch_teardown_dma_ops(dev);
1651 : }
1652 :
1653 0 : return ret;
1654 : }
1655 :
1656 0 : static void pci_dma_cleanup(struct device *dev)
1657 : {
1658 0 : struct pci_driver *driver = to_pci_driver(dev->driver);
1659 :
1660 : if (!driver->driver_managed_dma)
1661 : iommu_device_unuse_default_domain(dev);
1662 0 : }
1663 :
1664 : struct bus_type pci_bus_type = {
1665 : .name = "pci",
1666 : .match = pci_bus_match,
1667 : .uevent = pci_uevent,
1668 : .probe = pci_device_probe,
1669 : .remove = pci_device_remove,
1670 : .shutdown = pci_device_shutdown,
1671 : .dev_groups = pci_dev_groups,
1672 : .bus_groups = pci_bus_groups,
1673 : .drv_groups = pci_drv_groups,
1674 : .pm = PCI_PM_OPS_PTR,
1675 : .num_vf = pci_bus_num_vf,
1676 : .dma_configure = pci_dma_configure,
1677 : .dma_cleanup = pci_dma_cleanup,
1678 : };
1679 : EXPORT_SYMBOL(pci_bus_type);
1680 :
1681 : #ifdef CONFIG_PCIEPORTBUS
1682 : static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1683 : {
1684 : struct pcie_device *pciedev;
1685 : struct pcie_port_service_driver *driver;
1686 :
1687 : if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1688 : return 0;
1689 :
1690 : pciedev = to_pcie_device(dev);
1691 : driver = to_service_driver(drv);
1692 :
1693 : if (driver->service != pciedev->service)
1694 : return 0;
1695 :
1696 : if (driver->port_type != PCIE_ANY_PORT &&
1697 : driver->port_type != pci_pcie_type(pciedev->port))
1698 : return 0;
1699 :
1700 : return 1;
1701 : }
1702 :
1703 : struct bus_type pcie_port_bus_type = {
1704 : .name = "pci_express",
1705 : .match = pcie_port_bus_match,
1706 : };
1707 : EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1708 : #endif
1709 :
1710 1 : static int __init pci_driver_init(void)
1711 : {
1712 : int ret;
1713 :
1714 1 : ret = bus_register(&pci_bus_type);
1715 1 : if (ret)
1716 : return ret;
1717 :
1718 : #ifdef CONFIG_PCIEPORTBUS
1719 : ret = bus_register(&pcie_port_bus_type);
1720 : if (ret)
1721 : return ret;
1722 : #endif
1723 1 : dma_debug_add_bus(&pci_bus_type);
1724 1 : return 0;
1725 : }
1726 : postcore_initcall(pci_driver_init);
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