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1/*
2 * drivers/pci/pci-driver.c
3 *
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
6 *
7 * Released under the GPL v2 only.
8 *
9 */
10
11#include <linux/pci.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/device.h>
15#include <linux/mempolicy.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18#include <linux/sched.h>
19#include <linux/cpu.h>
20#include <linux/pm_runtime.h>
21#include <linux/suspend.h>
22#include "pci.h"
23
24struct pci_dynid {
25 struct list_head node;
26 struct pci_device_id id;
27};
28
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 */
50int 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;
57 int retval;
58
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 if (!dynid)
61 return -ENOMEM;
62
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
70
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
74
75 retval = driver_attach(&drv->driver);
76
77 return retval;
78}
79
80static void pci_free_dynids(struct pci_driver *drv)
81{
82 struct pci_dynid *dynid, *n;
83
84 spin_lock(&drv->dynids.lock);
85 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
86 list_del(&dynid->node);
87 kfree(dynid);
88 }
89 spin_unlock(&drv->dynids.lock);
90}
91
92/*
93 * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG
94 */
95#ifdef CONFIG_HOTPLUG
96/**
97 * store_new_id - sysfs frontend to pci_add_dynid()
98 * @driver: target device driver
99 * @buf: buffer for scanning device ID data
100 * @count: input size
101 *
102 * Allow PCI IDs to be added to an existing driver via sysfs.
103 */
104static ssize_t
105store_new_id(struct device_driver *driver, const char *buf, size_t count)
106{
107 struct pci_driver *pdrv = to_pci_driver(driver);
108 const struct pci_device_id *ids = pdrv->id_table;
109 __u32 vendor, device, subvendor=PCI_ANY_ID,
110 subdevice=PCI_ANY_ID, class=0, class_mask=0;
111 unsigned long driver_data=0;
112 int fields=0;
113 int retval;
114
115 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
116 &vendor, &device, &subvendor, &subdevice,
117 &class, &class_mask, &driver_data);
118 if (fields < 2)
119 return -EINVAL;
120
121 /* Only accept driver_data values that match an existing id_table
122 entry */
123 if (ids) {
124 retval = -EINVAL;
125 while (ids->vendor || ids->subvendor || ids->class_mask) {
126 if (driver_data == ids->driver_data) {
127 retval = 0;
128 break;
129 }
130 ids++;
131 }
132 if (retval) /* No match */
133 return retval;
134 }
135
136 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
137 class, class_mask, driver_data);
138 if (retval)
139 return retval;
140 return count;
141}
142static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
143
144/**
145 * store_remove_id - remove a PCI device ID from this driver
146 * @driver: target device driver
147 * @buf: buffer for scanning device ID data
148 * @count: input size
149 *
150 * Removes a dynamic pci device ID to this driver.
151 */
152static ssize_t
153store_remove_id(struct device_driver *driver, const char *buf, size_t count)
154{
155 struct pci_dynid *dynid, *n;
156 struct pci_driver *pdrv = to_pci_driver(driver);
157 __u32 vendor, device, subvendor = PCI_ANY_ID,
158 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
159 int fields = 0;
160 int retval = -ENODEV;
161
162 fields = sscanf(buf, "%x %x %x %x %x %x",
163 &vendor, &device, &subvendor, &subdevice,
164 &class, &class_mask);
165 if (fields < 2)
166 return -EINVAL;
167
168 spin_lock(&pdrv->dynids.lock);
169 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
170 struct pci_device_id *id = &dynid->id;
171 if ((id->vendor == vendor) &&
172 (id->device == device) &&
173 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
174 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
175 !((id->class ^ class) & class_mask)) {
176 list_del(&dynid->node);
177 kfree(dynid);
178 retval = 0;
179 break;
180 }
181 }
182 spin_unlock(&pdrv->dynids.lock);
183
184 if (retval)
185 return retval;
186 return count;
187}
188static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
189
190static int
191pci_create_newid_files(struct pci_driver *drv)
192{
193 int error = 0;
194
195 if (drv->probe != NULL) {
196 error = driver_create_file(&drv->driver, &driver_attr_new_id);
197 if (error == 0) {
198 error = driver_create_file(&drv->driver,
199 &driver_attr_remove_id);
200 if (error)
201 driver_remove_file(&drv->driver,
202 &driver_attr_new_id);
203 }
204 }
205 return error;
206}
207
208static void pci_remove_newid_files(struct pci_driver *drv)
209{
210 driver_remove_file(&drv->driver, &driver_attr_remove_id);
211 driver_remove_file(&drv->driver, &driver_attr_new_id);
212}
213#else /* !CONFIG_HOTPLUG */
214static inline int pci_create_newid_files(struct pci_driver *drv)
215{
216 return 0;
217}
218static inline void pci_remove_newid_files(struct pci_driver *drv) {}
219#endif
220
221/**
222 * pci_match_id - See if a pci device matches a given pci_id table
223 * @ids: array of PCI device id structures to search in
224 * @dev: the PCI device structure to match against.
225 *
226 * Used by a driver to check whether a PCI device present in the
227 * system is in its list of supported devices. Returns the matching
228 * pci_device_id structure or %NULL if there is no match.
229 *
230 * Deprecated, don't use this as it will not catch any dynamic ids
231 * that a driver might want to check for.
232 */
233const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
234 struct pci_dev *dev)
235{
236 if (ids) {
237 while (ids->vendor || ids->subvendor || ids->class_mask) {
238 if (pci_match_one_device(ids, dev))
239 return ids;
240 ids++;
241 }
242 }
243 return NULL;
244}
245
246/**
247 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
248 * @drv: the PCI driver to match against
249 * @dev: the PCI device structure to match against
250 *
251 * Used by a driver to check whether a PCI device present in the
252 * system is in its list of supported devices. Returns the matching
253 * pci_device_id structure or %NULL if there is no match.
254 */
255static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
256 struct pci_dev *dev)
257{
258 struct pci_dynid *dynid;
259
260 /* Look at the dynamic ids first, before the static ones */
261 spin_lock(&drv->dynids.lock);
262 list_for_each_entry(dynid, &drv->dynids.list, node) {
263 if (pci_match_one_device(&dynid->id, dev)) {
264 spin_unlock(&drv->dynids.lock);
265 return &dynid->id;
266 }
267 }
268 spin_unlock(&drv->dynids.lock);
269
270 return pci_match_id(drv->id_table, dev);
271}
272
273struct drv_dev_and_id {
274 struct pci_driver *drv;
275 struct pci_dev *dev;
276 const struct pci_device_id *id;
277};
278
279static long local_pci_probe(void *_ddi)
280{
281 struct drv_dev_and_id *ddi = _ddi;
282 struct device *dev = &ddi->dev->dev;
283 int rc;
284
285 /* Unbound PCI devices are always set to disabled and suspended.
286 * During probe, the device is set to enabled and active and the
287 * usage count is incremented. If the driver supports runtime PM,
288 * it should call pm_runtime_put_noidle() in its probe routine and
289 * pm_runtime_get_noresume() in its remove routine.
290 */
291 pm_runtime_get_noresume(dev);
292 pm_runtime_set_active(dev);
293 pm_runtime_enable(dev);
294
295 rc = ddi->drv->probe(ddi->dev, ddi->id);
296 if (rc) {
297 pm_runtime_disable(dev);
298 pm_runtime_set_suspended(dev);
299 pm_runtime_put_noidle(dev);
300 }
301 return rc;
302}
303
304static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
305 const struct pci_device_id *id)
306{
307 int error, node;
308 struct drv_dev_and_id ddi = { drv, dev, id };
309
310 /* Execute driver initialization on node where the device's
311 bus is attached to. This way the driver likely allocates
312 its local memory on the right node without any need to
313 change it. */
314 node = dev_to_node(&dev->dev);
315 if (node >= 0) {
316 int cpu;
317
318 get_online_cpus();
319 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
320 if (cpu < nr_cpu_ids)
321 error = work_on_cpu(cpu, local_pci_probe, &ddi);
322 else
323 error = local_pci_probe(&ddi);
324 put_online_cpus();
325 } else
326 error = local_pci_probe(&ddi);
327 return error;
328}
329
330/**
331 * __pci_device_probe - check if a driver wants to claim a specific PCI device
332 * @drv: driver to call to check if it wants the PCI device
333 * @pci_dev: PCI device being probed
334 *
335 * returns 0 on success, else error.
336 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
337 */
338static int
339__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
340{
341 const struct pci_device_id *id;
342 int error = 0;
343
344 if (!pci_dev->driver && drv->probe) {
345 error = -ENODEV;
346
347 id = pci_match_device(drv, pci_dev);
348 if (id)
349 error = pci_call_probe(drv, pci_dev, id);
350 if (error >= 0) {
351 pci_dev->driver = drv;
352 error = 0;
353 }
354 }
355 return error;
356}
357
358static int pci_device_probe(struct device * dev)
359{
360 int error = 0;
361 struct pci_driver *drv;
362 struct pci_dev *pci_dev;
363
364 drv = to_pci_driver(dev->driver);
365 pci_dev = to_pci_dev(dev);
366 pci_dev_get(pci_dev);
367 error = __pci_device_probe(drv, pci_dev);
368 if (error)
369 pci_dev_put(pci_dev);
370
371 return error;
372}
373
374static int pci_device_remove(struct device * dev)
375{
376 struct pci_dev * pci_dev = to_pci_dev(dev);
377 struct pci_driver * drv = pci_dev->driver;
378
379 if (drv) {
380 if (drv->remove) {
381 pm_runtime_get_sync(dev);
382 drv->remove(pci_dev);
383 pm_runtime_put_noidle(dev);
384 }
385 pci_dev->driver = NULL;
386 }
387
388 /* Undo the runtime PM settings in local_pci_probe() */
389 pm_runtime_disable(dev);
390 pm_runtime_set_suspended(dev);
391 pm_runtime_put_noidle(dev);
392
393 /*
394 * If the device is still on, set the power state as "unknown",
395 * since it might change by the next time we load the driver.
396 */
397 if (pci_dev->current_state == PCI_D0)
398 pci_dev->current_state = PCI_UNKNOWN;
399
400 /*
401 * We would love to complain here if pci_dev->is_enabled is set, that
402 * the driver should have called pci_disable_device(), but the
403 * unfortunate fact is there are too many odd BIOS and bridge setups
404 * that don't like drivers doing that all of the time.
405 * Oh well, we can dream of sane hardware when we sleep, no matter how
406 * horrible the crap we have to deal with is when we are awake...
407 */
408
409 pci_dev_put(pci_dev);
410 return 0;
411}
412
413static void pci_device_shutdown(struct device *dev)
414{
415 struct pci_dev *pci_dev = to_pci_dev(dev);
416 struct pci_driver *drv = pci_dev->driver;
417
418 if (drv && drv->shutdown)
419 drv->shutdown(pci_dev);
420 pci_msi_shutdown(pci_dev);
421 pci_msix_shutdown(pci_dev);
422
423 /*
424 * Turn off Bus Master bit on the device to tell it to not
425 * continue to do DMA
426 */
427 pci_disable_device(pci_dev);
428
429 /*
430 * Devices may be enabled to wake up by runtime PM, but they need not
431 * be supposed to wake up the system from its "power off" state (e.g.
432 * ACPI S5). Therefore disable wakeup for all devices that aren't
433 * supposed to wake up the system at this point. The state argument
434 * will be ignored by pci_enable_wake().
435 */
436 if (!device_may_wakeup(dev))
437 pci_enable_wake(pci_dev, PCI_UNKNOWN, false);
438}
439
440#ifdef CONFIG_PM
441
442/* Auxiliary functions used for system resume and run-time resume. */
443
444/**
445 * pci_restore_standard_config - restore standard config registers of PCI device
446 * @pci_dev: PCI device to handle
447 */
448static int pci_restore_standard_config(struct pci_dev *pci_dev)
449{
450 pci_update_current_state(pci_dev, PCI_UNKNOWN);
451
452 if (pci_dev->current_state != PCI_D0) {
453 int error = pci_set_power_state(pci_dev, PCI_D0);
454 if (error)
455 return error;
456 }
457
458 pci_restore_state(pci_dev);
459 return 0;
460}
461
462static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
463{
464 pci_restore_standard_config(pci_dev);
465 pci_fixup_device(pci_fixup_resume_early, pci_dev);
466}
467
468#endif
469
470#ifdef CONFIG_PM_SLEEP
471
472/*
473 * Default "suspend" method for devices that have no driver provided suspend,
474 * or not even a driver at all (second part).
475 */
476static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
477{
478 /*
479 * mark its power state as "unknown", since we don't know if
480 * e.g. the BIOS will change its device state when we suspend.
481 */
482 if (pci_dev->current_state == PCI_D0)
483 pci_dev->current_state = PCI_UNKNOWN;
484}
485
486/*
487 * Default "resume" method for devices that have no driver provided resume,
488 * or not even a driver at all (second part).
489 */
490static int pci_pm_reenable_device(struct pci_dev *pci_dev)
491{
492 int retval;
493
494 /* if the device was enabled before suspend, reenable */
495 retval = pci_reenable_device(pci_dev);
496 /*
497 * if the device was busmaster before the suspend, make it busmaster
498 * again
499 */
500 if (pci_dev->is_busmaster)
501 pci_set_master(pci_dev);
502
503 return retval;
504}
505
506static int pci_legacy_suspend(struct device *dev, pm_message_t state)
507{
508 struct pci_dev * pci_dev = to_pci_dev(dev);
509 struct pci_driver * drv = pci_dev->driver;
510
511 if (drv && drv->suspend) {
512 pci_power_t prev = pci_dev->current_state;
513 int error;
514
515 error = drv->suspend(pci_dev, state);
516 suspend_report_result(drv->suspend, error);
517 if (error)
518 return error;
519
520 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
521 && pci_dev->current_state != PCI_UNKNOWN) {
522 WARN_ONCE(pci_dev->current_state != prev,
523 "PCI PM: Device state not saved by %pF\n",
524 drv->suspend);
525 }
526 }
527
528 pci_fixup_device(pci_fixup_suspend, pci_dev);
529
530 return 0;
531}
532
533static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
534{
535 struct pci_dev * pci_dev = to_pci_dev(dev);
536 struct pci_driver * drv = pci_dev->driver;
537
538 if (drv && drv->suspend_late) {
539 pci_power_t prev = pci_dev->current_state;
540 int error;
541
542 error = drv->suspend_late(pci_dev, state);
543 suspend_report_result(drv->suspend_late, error);
544 if (error)
545 return error;
546
547 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
548 && pci_dev->current_state != PCI_UNKNOWN) {
549 WARN_ONCE(pci_dev->current_state != prev,
550 "PCI PM: Device state not saved by %pF\n",
551 drv->suspend_late);
552 return 0;
553 }
554 }
555
556 if (!pci_dev->state_saved)
557 pci_save_state(pci_dev);
558
559 pci_pm_set_unknown_state(pci_dev);
560
561 return 0;
562}
563
564static int pci_legacy_resume_early(struct device *dev)
565{
566 struct pci_dev * pci_dev = to_pci_dev(dev);
567 struct pci_driver * drv = pci_dev->driver;
568
569 return drv && drv->resume_early ?
570 drv->resume_early(pci_dev) : 0;
571}
572
573static int pci_legacy_resume(struct device *dev)
574{
575 struct pci_dev * pci_dev = to_pci_dev(dev);
576 struct pci_driver * drv = pci_dev->driver;
577
578 pci_fixup_device(pci_fixup_resume, pci_dev);
579
580 return drv && drv->resume ?
581 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
582}
583
584/* Auxiliary functions used by the new power management framework */
585
586static void pci_pm_default_resume(struct pci_dev *pci_dev)
587{
588 pci_fixup_device(pci_fixup_resume, pci_dev);
589
590 if (!pci_is_bridge(pci_dev))
591 pci_enable_wake(pci_dev, PCI_D0, false);
592}
593
594static void pci_pm_default_suspend(struct pci_dev *pci_dev)
595{
596 /* Disable non-bridge devices without PM support */
597 if (!pci_is_bridge(pci_dev))
598 pci_disable_enabled_device(pci_dev);
599}
600
601static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
602{
603 struct pci_driver *drv = pci_dev->driver;
604 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
605 || drv->resume_early);
606
607 /*
608 * Legacy PM support is used by default, so warn if the new framework is
609 * supported as well. Drivers are supposed to support either the
610 * former, or the latter, but not both at the same time.
611 */
612 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
613 drv->name, pci_dev->vendor, pci_dev->device);
614
615 return ret;
616}
617
618/* New power management framework */
619
620static int pci_pm_prepare(struct device *dev)
621{
622 struct device_driver *drv = dev->driver;
623 int error = 0;
624
625 /*
626 * If a PCI device configured to wake up the system from sleep states
627 * has been suspended at run time and there's a resume request pending
628 * for it, this is equivalent to the device signaling wakeup, so the
629 * system suspend operation should be aborted.
630 */
631 pm_runtime_get_noresume(dev);
632 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
633 pm_wakeup_event(dev, 0);
634
635 if (pm_wakeup_pending()) {
636 pm_runtime_put_sync(dev);
637 return -EBUSY;
638 }
639
640 /*
641 * PCI devices suspended at run time need to be resumed at this
642 * point, because in general it is necessary to reconfigure them for
643 * system suspend. Namely, if the device is supposed to wake up the
644 * system from the sleep state, we may need to reconfigure it for this
645 * purpose. In turn, if the device is not supposed to wake up the
646 * system from the sleep state, we'll have to prevent it from signaling
647 * wake-up.
648 */
649 pm_runtime_resume(dev);
650
651 if (drv && drv->pm && drv->pm->prepare)
652 error = drv->pm->prepare(dev);
653
654 return error;
655}
656
657static void pci_pm_complete(struct device *dev)
658{
659 struct device_driver *drv = dev->driver;
660
661 if (drv && drv->pm && drv->pm->complete)
662 drv->pm->complete(dev);
663
664 pm_runtime_put_sync(dev);
665}
666
667#else /* !CONFIG_PM_SLEEP */
668
669#define pci_pm_prepare NULL
670#define pci_pm_complete NULL
671
672#endif /* !CONFIG_PM_SLEEP */
673
674#ifdef CONFIG_SUSPEND
675
676static int pci_pm_suspend(struct device *dev)
677{
678 struct pci_dev *pci_dev = to_pci_dev(dev);
679 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
680
681 if (pci_has_legacy_pm_support(pci_dev))
682 return pci_legacy_suspend(dev, PMSG_SUSPEND);
683
684 if (!pm) {
685 pci_pm_default_suspend(pci_dev);
686 goto Fixup;
687 }
688
689 if (pm->suspend) {
690 pci_power_t prev = pci_dev->current_state;
691 int error;
692
693 error = pm->suspend(dev);
694 suspend_report_result(pm->suspend, error);
695 if (error)
696 return error;
697
698 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
699 && pci_dev->current_state != PCI_UNKNOWN) {
700 WARN_ONCE(pci_dev->current_state != prev,
701 "PCI PM: State of device not saved by %pF\n",
702 pm->suspend);
703 }
704 }
705
706 Fixup:
707 pci_fixup_device(pci_fixup_suspend, pci_dev);
708
709 return 0;
710}
711
712static int pci_pm_suspend_noirq(struct device *dev)
713{
714 struct pci_dev *pci_dev = to_pci_dev(dev);
715 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
716
717 if (pci_has_legacy_pm_support(pci_dev))
718 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
719
720 if (!pm) {
721 pci_save_state(pci_dev);
722 return 0;
723 }
724
725 if (pm->suspend_noirq) {
726 pci_power_t prev = pci_dev->current_state;
727 int error;
728
729 error = pm->suspend_noirq(dev);
730 suspend_report_result(pm->suspend_noirq, error);
731 if (error)
732 return error;
733
734 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
735 && pci_dev->current_state != PCI_UNKNOWN) {
736 WARN_ONCE(pci_dev->current_state != prev,
737 "PCI PM: State of device not saved by %pF\n",
738 pm->suspend_noirq);
739 return 0;
740 }
741 }
742
743 if (!pci_dev->state_saved) {
744 pci_save_state(pci_dev);
745 if (!pci_is_bridge(pci_dev))
746 pci_prepare_to_sleep(pci_dev);
747 }
748
749 pci_pm_set_unknown_state(pci_dev);
750
751 /*
752 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
753 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
754 * hasn't been quiesced and tries to turn it off. If the controller
755 * is already in D3, this can hang or cause memory corruption.
756 *
757 * Since the value of the COMMAND register doesn't matter once the
758 * device has been suspended, we can safely set it to 0 here.
759 */
760 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
761 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
762
763 return 0;
764}
765
766static int pci_pm_resume_noirq(struct device *dev)
767{
768 struct pci_dev *pci_dev = to_pci_dev(dev);
769 struct device_driver *drv = dev->driver;
770 int error = 0;
771
772 pci_pm_default_resume_early(pci_dev);
773
774 if (pci_has_legacy_pm_support(pci_dev))
775 return pci_legacy_resume_early(dev);
776
777 if (drv && drv->pm && drv->pm->resume_noirq)
778 error = drv->pm->resume_noirq(dev);
779
780 return error;
781}
782
783static int pci_pm_resume(struct device *dev)
784{
785 struct pci_dev *pci_dev = to_pci_dev(dev);
786 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
787 int error = 0;
788
789 /*
790 * This is necessary for the suspend error path in which resume is
791 * called without restoring the standard config registers of the device.
792 */
793 if (pci_dev->state_saved)
794 pci_restore_standard_config(pci_dev);
795
796 if (pci_has_legacy_pm_support(pci_dev))
797 return pci_legacy_resume(dev);
798
799 pci_pm_default_resume(pci_dev);
800
801 if (pm) {
802 if (pm->resume)
803 error = pm->resume(dev);
804 } else {
805 pci_pm_reenable_device(pci_dev);
806 }
807
808 return error;
809}
810
811#else /* !CONFIG_SUSPEND */
812
813#define pci_pm_suspend NULL
814#define pci_pm_suspend_noirq NULL
815#define pci_pm_resume NULL
816#define pci_pm_resume_noirq NULL
817
818#endif /* !CONFIG_SUSPEND */
819
820#ifdef CONFIG_HIBERNATE_CALLBACKS
821
822static int pci_pm_freeze(struct device *dev)
823{
824 struct pci_dev *pci_dev = to_pci_dev(dev);
825 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
826
827 if (pci_has_legacy_pm_support(pci_dev))
828 return pci_legacy_suspend(dev, PMSG_FREEZE);
829
830 if (!pm) {
831 pci_pm_default_suspend(pci_dev);
832 return 0;
833 }
834
835 if (pm->freeze) {
836 int error;
837
838 error = pm->freeze(dev);
839 suspend_report_result(pm->freeze, error);
840 if (error)
841 return error;
842 }
843
844 return 0;
845}
846
847static int pci_pm_freeze_noirq(struct device *dev)
848{
849 struct pci_dev *pci_dev = to_pci_dev(dev);
850 struct device_driver *drv = dev->driver;
851
852 if (pci_has_legacy_pm_support(pci_dev))
853 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
854
855 if (drv && drv->pm && drv->pm->freeze_noirq) {
856 int error;
857
858 error = drv->pm->freeze_noirq(dev);
859 suspend_report_result(drv->pm->freeze_noirq, error);
860 if (error)
861 return error;
862 }
863
864 if (!pci_dev->state_saved)
865 pci_save_state(pci_dev);
866
867 pci_pm_set_unknown_state(pci_dev);
868
869 return 0;
870}
871
872static int pci_pm_thaw_noirq(struct device *dev)
873{
874 struct pci_dev *pci_dev = to_pci_dev(dev);
875 struct device_driver *drv = dev->driver;
876 int error = 0;
877
878 if (pci_has_legacy_pm_support(pci_dev))
879 return pci_legacy_resume_early(dev);
880
881 pci_update_current_state(pci_dev, PCI_D0);
882
883 if (drv && drv->pm && drv->pm->thaw_noirq)
884 error = drv->pm->thaw_noirq(dev);
885
886 return error;
887}
888
889static int pci_pm_thaw(struct device *dev)
890{
891 struct pci_dev *pci_dev = to_pci_dev(dev);
892 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
893 int error = 0;
894
895 if (pci_has_legacy_pm_support(pci_dev))
896 return pci_legacy_resume(dev);
897
898 if (pm) {
899 if (pm->thaw)
900 error = pm->thaw(dev);
901 } else {
902 pci_pm_reenable_device(pci_dev);
903 }
904
905 pci_dev->state_saved = false;
906
907 return error;
908}
909
910static int pci_pm_poweroff(struct device *dev)
911{
912 struct pci_dev *pci_dev = to_pci_dev(dev);
913 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
914
915 if (pci_has_legacy_pm_support(pci_dev))
916 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
917
918 if (!pm) {
919 pci_pm_default_suspend(pci_dev);
920 goto Fixup;
921 }
922
923 if (pm->poweroff) {
924 int error;
925
926 error = pm->poweroff(dev);
927 suspend_report_result(pm->poweroff, error);
928 if (error)
929 return error;
930 }
931
932 Fixup:
933 pci_fixup_device(pci_fixup_suspend, pci_dev);
934
935 return 0;
936}
937
938static int pci_pm_poweroff_noirq(struct device *dev)
939{
940 struct pci_dev *pci_dev = to_pci_dev(dev);
941 struct device_driver *drv = dev->driver;
942
943 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
944 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
945
946 if (!drv || !drv->pm)
947 return 0;
948
949 if (drv->pm->poweroff_noirq) {
950 int error;
951
952 error = drv->pm->poweroff_noirq(dev);
953 suspend_report_result(drv->pm->poweroff_noirq, error);
954 if (error)
955 return error;
956 }
957
958 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
959 pci_prepare_to_sleep(pci_dev);
960
961 /*
962 * The reason for doing this here is the same as for the analogous code
963 * in pci_pm_suspend_noirq().
964 */
965 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
966 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
967
968 return 0;
969}
970
971static int pci_pm_restore_noirq(struct device *dev)
972{
973 struct pci_dev *pci_dev = to_pci_dev(dev);
974 struct device_driver *drv = dev->driver;
975 int error = 0;
976
977 pci_pm_default_resume_early(pci_dev);
978
979 if (pci_has_legacy_pm_support(pci_dev))
980 return pci_legacy_resume_early(dev);
981
982 if (drv && drv->pm && drv->pm->restore_noirq)
983 error = drv->pm->restore_noirq(dev);
984
985 return error;
986}
987
988static int pci_pm_restore(struct device *dev)
989{
990 struct pci_dev *pci_dev = to_pci_dev(dev);
991 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
992 int error = 0;
993
994 /*
995 * This is necessary for the hibernation error path in which restore is
996 * called without restoring the standard config registers of the device.
997 */
998 if (pci_dev->state_saved)
999 pci_restore_standard_config(pci_dev);
1000
1001 if (pci_has_legacy_pm_support(pci_dev))
1002 return pci_legacy_resume(dev);
1003
1004 pci_pm_default_resume(pci_dev);
1005
1006 if (pm) {
1007 if (pm->restore)
1008 error = pm->restore(dev);
1009 } else {
1010 pci_pm_reenable_device(pci_dev);
1011 }
1012
1013 return error;
1014}
1015
1016#else /* !CONFIG_HIBERNATE_CALLBACKS */
1017
1018#define pci_pm_freeze NULL
1019#define pci_pm_freeze_noirq NULL
1020#define pci_pm_thaw NULL
1021#define pci_pm_thaw_noirq NULL
1022#define pci_pm_poweroff NULL
1023#define pci_pm_poweroff_noirq NULL
1024#define pci_pm_restore NULL
1025#define pci_pm_restore_noirq NULL
1026
1027#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1028
1029#ifdef CONFIG_PM_RUNTIME
1030
1031static int pci_pm_runtime_suspend(struct device *dev)
1032{
1033 struct pci_dev *pci_dev = to_pci_dev(dev);
1034 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1035 pci_power_t prev = pci_dev->current_state;
1036 int error;
1037
1038 if (!pm || !pm->runtime_suspend)
1039 return -ENOSYS;
1040
1041 error = pm->runtime_suspend(dev);
1042 suspend_report_result(pm->runtime_suspend, error);
1043 if (error)
1044 return error;
1045
1046 pci_fixup_device(pci_fixup_suspend, pci_dev);
1047
1048 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1049 && pci_dev->current_state != PCI_UNKNOWN) {
1050 WARN_ONCE(pci_dev->current_state != prev,
1051 "PCI PM: State of device not saved by %pF\n",
1052 pm->runtime_suspend);
1053 return 0;
1054 }
1055
1056 if (!pci_dev->state_saved)
1057 pci_save_state(pci_dev);
1058
1059 pci_finish_runtime_suspend(pci_dev);
1060
1061 return 0;
1062}
1063
1064static int pci_pm_runtime_resume(struct device *dev)
1065{
1066 struct pci_dev *pci_dev = to_pci_dev(dev);
1067 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1068
1069 if (!pm || !pm->runtime_resume)
1070 return -ENOSYS;
1071
1072 pci_pm_default_resume_early(pci_dev);
1073 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1074 pci_fixup_device(pci_fixup_resume, pci_dev);
1075
1076 return pm->runtime_resume(dev);
1077}
1078
1079static int pci_pm_runtime_idle(struct device *dev)
1080{
1081 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1082
1083 if (!pm)
1084 return -ENOSYS;
1085
1086 if (pm->runtime_idle) {
1087 int ret = pm->runtime_idle(dev);
1088 if (ret)
1089 return ret;
1090 }
1091
1092 pm_runtime_suspend(dev);
1093
1094 return 0;
1095}
1096
1097#else /* !CONFIG_PM_RUNTIME */
1098
1099#define pci_pm_runtime_suspend NULL
1100#define pci_pm_runtime_resume NULL
1101#define pci_pm_runtime_idle NULL
1102
1103#endif /* !CONFIG_PM_RUNTIME */
1104
1105#ifdef CONFIG_PM
1106
1107const struct dev_pm_ops pci_dev_pm_ops = {
1108 .prepare = pci_pm_prepare,
1109 .complete = pci_pm_complete,
1110 .suspend = pci_pm_suspend,
1111 .resume = pci_pm_resume,
1112 .freeze = pci_pm_freeze,
1113 .thaw = pci_pm_thaw,
1114 .poweroff = pci_pm_poweroff,
1115 .restore = pci_pm_restore,
1116 .suspend_noirq = pci_pm_suspend_noirq,
1117 .resume_noirq = pci_pm_resume_noirq,
1118 .freeze_noirq = pci_pm_freeze_noirq,
1119 .thaw_noirq = pci_pm_thaw_noirq,
1120 .poweroff_noirq = pci_pm_poweroff_noirq,
1121 .restore_noirq = pci_pm_restore_noirq,
1122 .runtime_suspend = pci_pm_runtime_suspend,
1123 .runtime_resume = pci_pm_runtime_resume,
1124 .runtime_idle = pci_pm_runtime_idle,
1125};
1126
1127#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1128
1129#else /* !COMFIG_PM_OPS */
1130
1131#define PCI_PM_OPS_PTR NULL
1132
1133#endif /* !COMFIG_PM_OPS */
1134
1135/**
1136 * __pci_register_driver - register a new pci driver
1137 * @drv: the driver structure to register
1138 * @owner: owner module of drv
1139 * @mod_name: module name string
1140 *
1141 * Adds the driver structure to the list of registered drivers.
1142 * Returns a negative value on error, otherwise 0.
1143 * If no error occurred, the driver remains registered even if
1144 * no device was claimed during registration.
1145 */
1146int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1147 const char *mod_name)
1148{
1149 int error;
1150
1151 /* initialize common driver fields */
1152 drv->driver.name = drv->name;
1153 drv->driver.bus = &pci_bus_type;
1154 drv->driver.owner = owner;
1155 drv->driver.mod_name = mod_name;
1156
1157 spin_lock_init(&drv->dynids.lock);
1158 INIT_LIST_HEAD(&drv->dynids.list);
1159
1160 /* register with core */
1161 error = driver_register(&drv->driver);
1162 if (error)
1163 goto out;
1164
1165 error = pci_create_newid_files(drv);
1166 if (error)
1167 goto out_newid;
1168out:
1169 return error;
1170
1171out_newid:
1172 driver_unregister(&drv->driver);
1173 goto out;
1174}
1175
1176/**
1177 * pci_unregister_driver - unregister a pci driver
1178 * @drv: the driver structure to unregister
1179 *
1180 * Deletes the driver structure from the list of registered PCI drivers,
1181 * gives it a chance to clean up by calling its remove() function for
1182 * each device it was responsible for, and marks those devices as
1183 * driverless.
1184 */
1185
1186void
1187pci_unregister_driver(struct pci_driver *drv)
1188{
1189 pci_remove_newid_files(drv);
1190 driver_unregister(&drv->driver);
1191 pci_free_dynids(drv);
1192}
1193
1194static struct pci_driver pci_compat_driver = {
1195 .name = "compat"
1196};
1197
1198/**
1199 * pci_dev_driver - get the pci_driver of a device
1200 * @dev: the device to query
1201 *
1202 * Returns the appropriate pci_driver structure or %NULL if there is no
1203 * registered driver for the device.
1204 */
1205struct pci_driver *
1206pci_dev_driver(const struct pci_dev *dev)
1207{
1208 if (dev->driver)
1209 return dev->driver;
1210 else {
1211 int i;
1212 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1213 if (dev->resource[i].flags & IORESOURCE_BUSY)
1214 return &pci_compat_driver;
1215 }
1216 return NULL;
1217}
1218
1219/**
1220 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1221 * @dev: the PCI device structure to match against
1222 * @drv: the device driver to search for matching PCI device id structures
1223 *
1224 * Used by a driver to check whether a PCI device present in the
1225 * system is in its list of supported devices. Returns the matching
1226 * pci_device_id structure or %NULL if there is no match.
1227 */
1228static int pci_bus_match(struct device *dev, struct device_driver *drv)
1229{
1230 struct pci_dev *pci_dev = to_pci_dev(dev);
1231 struct pci_driver *pci_drv = to_pci_driver(drv);
1232 const struct pci_device_id *found_id;
1233
1234 found_id = pci_match_device(pci_drv, pci_dev);
1235 if (found_id)
1236 return 1;
1237
1238 return 0;
1239}
1240
1241/**
1242 * pci_dev_get - increments the reference count of the pci device structure
1243 * @dev: the device being referenced
1244 *
1245 * Each live reference to a device should be refcounted.
1246 *
1247 * Drivers for PCI devices should normally record such references in
1248 * their probe() methods, when they bind to a device, and release
1249 * them by calling pci_dev_put(), in their disconnect() methods.
1250 *
1251 * A pointer to the device with the incremented reference counter is returned.
1252 */
1253struct pci_dev *pci_dev_get(struct pci_dev *dev)
1254{
1255 if (dev)
1256 get_device(&dev->dev);
1257 return dev;
1258}
1259
1260/**
1261 * pci_dev_put - release a use of the pci device structure
1262 * @dev: device that's been disconnected
1263 *
1264 * Must be called when a user of a device is finished with it. When the last
1265 * user of the device calls this function, the memory of the device is freed.
1266 */
1267void pci_dev_put(struct pci_dev *dev)
1268{
1269 if (dev)
1270 put_device(&dev->dev);
1271}
1272
1273#ifndef CONFIG_HOTPLUG
1274int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1275{
1276 return -ENODEV;
1277}
1278#endif
1279
1280struct bus_type pci_bus_type = {
1281 .name = "pci",
1282 .match = pci_bus_match,
1283 .uevent = pci_uevent,
1284 .probe = pci_device_probe,
1285 .remove = pci_device_remove,
1286 .shutdown = pci_device_shutdown,
1287 .dev_attrs = pci_dev_attrs,
1288 .bus_attrs = pci_bus_attrs,
1289 .pm = PCI_PM_OPS_PTR,
1290};
1291
1292static int __init pci_driver_init(void)
1293{
1294 return bus_register(&pci_bus_type);
1295}
1296
1297postcore_initcall(pci_driver_init);
1298
1299EXPORT_SYMBOL_GPL(pci_add_dynid);
1300EXPORT_SYMBOL(pci_match_id);
1301EXPORT_SYMBOL(__pci_register_driver);
1302EXPORT_SYMBOL(pci_unregister_driver);
1303EXPORT_SYMBOL(pci_dev_driver);
1304EXPORT_SYMBOL(pci_bus_type);
1305EXPORT_SYMBOL(pci_dev_get);
1306EXPORT_SYMBOL(pci_dev_put);
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 "pci.h"
23#include "pcie/portdrv.h"
24
25struct pci_dynid {
26 struct list_head node;
27 struct pci_device_id id;
28};
29
30/**
31 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
32 * @drv: target pci driver
33 * @vendor: PCI vendor ID
34 * @device: PCI device ID
35 * @subvendor: PCI subvendor ID
36 * @subdevice: PCI subdevice ID
37 * @class: PCI class
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
40 *
41 * Adds a new dynamic pci device ID to this driver and causes the
42 * driver to probe for all devices again. @drv must have been
43 * registered prior to calling this function.
44 *
45 * CONTEXT:
46 * Does GFP_KERNEL allocation.
47 *
48 * RETURNS:
49 * 0 on success, -errno on failure.
50 */
51int pci_add_dynid(struct pci_driver *drv,
52 unsigned int vendor, unsigned int device,
53 unsigned int subvendor, unsigned int subdevice,
54 unsigned int class, unsigned int class_mask,
55 unsigned long driver_data)
56{
57 struct pci_dynid *dynid;
58
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 if (!dynid)
61 return -ENOMEM;
62
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
70
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
74
75 return driver_attach(&drv->driver);
76}
77EXPORT_SYMBOL_GPL(pci_add_dynid);
78
79static void pci_free_dynids(struct pci_driver *drv)
80{
81 struct pci_dynid *dynid, *n;
82
83 spin_lock(&drv->dynids.lock);
84 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
85 list_del(&dynid->node);
86 kfree(dynid);
87 }
88 spin_unlock(&drv->dynids.lock);
89}
90
91/**
92 * store_new_id - sysfs frontend to pci_add_dynid()
93 * @driver: target device driver
94 * @buf: buffer for scanning device ID data
95 * @count: input size
96 *
97 * Allow PCI IDs to be added to an existing driver via sysfs.
98 */
99static ssize_t new_id_store(struct device_driver *driver, const char *buf,
100 size_t count)
101{
102 struct pci_driver *pdrv = to_pci_driver(driver);
103 const struct pci_device_id *ids = pdrv->id_table;
104 u32 vendor, device, subvendor = PCI_ANY_ID,
105 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
106 unsigned long driver_data = 0;
107 int fields = 0;
108 int retval = 0;
109
110 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
111 &vendor, &device, &subvendor, &subdevice,
112 &class, &class_mask, &driver_data);
113 if (fields < 2)
114 return -EINVAL;
115
116 if (fields != 7) {
117 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
118 if (!pdev)
119 return -ENOMEM;
120
121 pdev->vendor = vendor;
122 pdev->device = device;
123 pdev->subsystem_vendor = subvendor;
124 pdev->subsystem_device = subdevice;
125 pdev->class = class;
126
127 if (pci_match_id(pdrv->id_table, pdev))
128 retval = -EEXIST;
129
130 kfree(pdev);
131
132 if (retval)
133 return retval;
134 }
135
136 /* Only accept driver_data values that match an existing id_table
137 entry */
138 if (ids) {
139 retval = -EINVAL;
140 while (ids->vendor || ids->subvendor || ids->class_mask) {
141 if (driver_data == ids->driver_data) {
142 retval = 0;
143 break;
144 }
145 ids++;
146 }
147 if (retval) /* No match */
148 return retval;
149 }
150
151 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
152 class, class_mask, driver_data);
153 if (retval)
154 return retval;
155 return count;
156}
157static DRIVER_ATTR_WO(new_id);
158
159/**
160 * store_remove_id - remove a PCI device ID from this driver
161 * @driver: target device driver
162 * @buf: buffer for scanning device ID data
163 * @count: input size
164 *
165 * Removes a dynamic pci device ID to this driver.
166 */
167static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
168 size_t count)
169{
170 struct pci_dynid *dynid, *n;
171 struct pci_driver *pdrv = to_pci_driver(driver);
172 u32 vendor, device, subvendor = PCI_ANY_ID,
173 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
174 int fields = 0;
175 size_t retval = -ENODEV;
176
177 fields = sscanf(buf, "%x %x %x %x %x %x",
178 &vendor, &device, &subvendor, &subdevice,
179 &class, &class_mask);
180 if (fields < 2)
181 return -EINVAL;
182
183 spin_lock(&pdrv->dynids.lock);
184 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
185 struct pci_device_id *id = &dynid->id;
186 if ((id->vendor == vendor) &&
187 (id->device == device) &&
188 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
189 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
190 !((id->class ^ class) & class_mask)) {
191 list_del(&dynid->node);
192 kfree(dynid);
193 retval = count;
194 break;
195 }
196 }
197 spin_unlock(&pdrv->dynids.lock);
198
199 return retval;
200}
201static DRIVER_ATTR_WO(remove_id);
202
203static struct attribute *pci_drv_attrs[] = {
204 &driver_attr_new_id.attr,
205 &driver_attr_remove_id.attr,
206 NULL,
207};
208ATTRIBUTE_GROUPS(pci_drv);
209
210/**
211 * pci_match_id - See if a pci device matches a given pci_id table
212 * @ids: array of PCI device id structures to search in
213 * @dev: the PCI device structure to match against.
214 *
215 * Used by a driver to check whether a PCI device present in the
216 * system is in its list of supported devices. Returns the matching
217 * pci_device_id structure or %NULL if there is no match.
218 *
219 * Deprecated, don't use this as it will not catch any dynamic ids
220 * that a driver might want to check for.
221 */
222const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
223 struct pci_dev *dev)
224{
225 if (ids) {
226 while (ids->vendor || ids->subvendor || ids->class_mask) {
227 if (pci_match_one_device(ids, dev))
228 return ids;
229 ids++;
230 }
231 }
232 return NULL;
233}
234EXPORT_SYMBOL(pci_match_id);
235
236static const struct pci_device_id pci_device_id_any = {
237 .vendor = PCI_ANY_ID,
238 .device = PCI_ANY_ID,
239 .subvendor = PCI_ANY_ID,
240 .subdevice = PCI_ANY_ID,
241};
242
243/**
244 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
245 * @drv: the PCI driver to match against
246 * @dev: the PCI device structure to match against
247 *
248 * Used by a driver to check whether a PCI device present in the
249 * system is in its list of supported devices. Returns the matching
250 * pci_device_id structure or %NULL if there is no match.
251 */
252static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
253 struct pci_dev *dev)
254{
255 struct pci_dynid *dynid;
256 const struct pci_device_id *found_id = NULL;
257
258 /* When driver_override is set, only bind to the matching driver */
259 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
260 return NULL;
261
262 /* Look at the dynamic ids first, before the static ones */
263 spin_lock(&drv->dynids.lock);
264 list_for_each_entry(dynid, &drv->dynids.list, node) {
265 if (pci_match_one_device(&dynid->id, dev)) {
266 found_id = &dynid->id;
267 break;
268 }
269 }
270 spin_unlock(&drv->dynids.lock);
271
272 if (!found_id)
273 found_id = pci_match_id(drv->id_table, dev);
274
275 /* driver_override will always match, send a dummy id */
276 if (!found_id && dev->driver_override)
277 found_id = &pci_device_id_any;
278
279 return found_id;
280}
281
282struct drv_dev_and_id {
283 struct pci_driver *drv;
284 struct pci_dev *dev;
285 const struct pci_device_id *id;
286};
287
288static long local_pci_probe(void *_ddi)
289{
290 struct drv_dev_and_id *ddi = _ddi;
291 struct pci_dev *pci_dev = ddi->dev;
292 struct pci_driver *pci_drv = ddi->drv;
293 struct device *dev = &pci_dev->dev;
294 int rc;
295
296 /*
297 * Unbound PCI devices are always put in D0, regardless of
298 * runtime PM status. During probe, the device is set to
299 * active and the usage count is incremented. If the driver
300 * supports runtime PM, it should call pm_runtime_put_noidle(),
301 * or any other runtime PM helper function decrementing the usage
302 * count, in its probe routine and pm_runtime_get_noresume() in
303 * its remove routine.
304 */
305 pm_runtime_get_sync(dev);
306 pci_dev->driver = pci_drv;
307 rc = pci_drv->probe(pci_dev, ddi->id);
308 if (!rc)
309 return rc;
310 if (rc < 0) {
311 pci_dev->driver = NULL;
312 pm_runtime_put_sync(dev);
313 return rc;
314 }
315 /*
316 * Probe function should return < 0 for failure, 0 for success
317 * Treat values > 0 as success, but warn.
318 */
319 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
320 rc);
321 return 0;
322}
323
324static bool pci_physfn_is_probed(struct pci_dev *dev)
325{
326#ifdef CONFIG_PCI_IOV
327 return dev->is_virtfn && dev->physfn->is_probed;
328#else
329 return false;
330#endif
331}
332
333static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
334 const struct pci_device_id *id)
335{
336 int error, node, cpu;
337 int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
338 struct drv_dev_and_id ddi = { drv, dev, id };
339
340 /*
341 * Execute driver initialization on node where the device is
342 * attached. This way the driver likely allocates its local memory
343 * on the right node.
344 */
345 node = dev_to_node(&dev->dev);
346 dev->is_probed = 1;
347
348 cpu_hotplug_disable();
349
350 /*
351 * Prevent nesting work_on_cpu() for the case where a Virtual Function
352 * device is probed from work_on_cpu() of the Physical device.
353 */
354 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
355 pci_physfn_is_probed(dev))
356 cpu = nr_cpu_ids;
357 else
358 cpu = cpumask_any_and(cpumask_of_node(node),
359 housekeeping_cpumask(hk_flags));
360
361 if (cpu < nr_cpu_ids)
362 error = work_on_cpu(cpu, local_pci_probe, &ddi);
363 else
364 error = local_pci_probe(&ddi);
365
366 dev->is_probed = 0;
367 cpu_hotplug_enable();
368 return error;
369}
370
371/**
372 * __pci_device_probe - check if a driver wants to claim a specific PCI device
373 * @drv: driver to call to check if it wants the PCI device
374 * @pci_dev: PCI device being probed
375 *
376 * returns 0 on success, else error.
377 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
378 */
379static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
380{
381 const struct pci_device_id *id;
382 int error = 0;
383
384 if (!pci_dev->driver && drv->probe) {
385 error = -ENODEV;
386
387 id = pci_match_device(drv, pci_dev);
388 if (id)
389 error = pci_call_probe(drv, pci_dev, id);
390 }
391 return error;
392}
393
394int __weak pcibios_alloc_irq(struct pci_dev *dev)
395{
396 return 0;
397}
398
399void __weak pcibios_free_irq(struct pci_dev *dev)
400{
401}
402
403#ifdef CONFIG_PCI_IOV
404static inline bool pci_device_can_probe(struct pci_dev *pdev)
405{
406 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
407 pdev->driver_override);
408}
409#else
410static inline bool pci_device_can_probe(struct pci_dev *pdev)
411{
412 return true;
413}
414#endif
415
416static int pci_device_probe(struct device *dev)
417{
418 int error;
419 struct pci_dev *pci_dev = to_pci_dev(dev);
420 struct pci_driver *drv = to_pci_driver(dev->driver);
421
422 if (!pci_device_can_probe(pci_dev))
423 return -ENODEV;
424
425 pci_assign_irq(pci_dev);
426
427 error = pcibios_alloc_irq(pci_dev);
428 if (error < 0)
429 return error;
430
431 pci_dev_get(pci_dev);
432 error = __pci_device_probe(drv, pci_dev);
433 if (error) {
434 pcibios_free_irq(pci_dev);
435 pci_dev_put(pci_dev);
436 }
437
438 return error;
439}
440
441static int pci_device_remove(struct device *dev)
442{
443 struct pci_dev *pci_dev = to_pci_dev(dev);
444 struct pci_driver *drv = pci_dev->driver;
445
446 if (drv) {
447 if (drv->remove) {
448 pm_runtime_get_sync(dev);
449 drv->remove(pci_dev);
450 pm_runtime_put_noidle(dev);
451 }
452 pcibios_free_irq(pci_dev);
453 pci_dev->driver = NULL;
454 pci_iov_remove(pci_dev);
455 }
456
457 /* Undo the runtime PM settings in local_pci_probe() */
458 pm_runtime_put_sync(dev);
459
460 /*
461 * If the device is still on, set the power state as "unknown",
462 * since it might change by the next time we load the driver.
463 */
464 if (pci_dev->current_state == PCI_D0)
465 pci_dev->current_state = PCI_UNKNOWN;
466
467 /*
468 * We would love to complain here if pci_dev->is_enabled is set, that
469 * the driver should have called pci_disable_device(), but the
470 * unfortunate fact is there are too many odd BIOS and bridge setups
471 * that don't like drivers doing that all of the time.
472 * Oh well, we can dream of sane hardware when we sleep, no matter how
473 * horrible the crap we have to deal with is when we are awake...
474 */
475
476 pci_dev_put(pci_dev);
477 return 0;
478}
479
480static void pci_device_shutdown(struct device *dev)
481{
482 struct pci_dev *pci_dev = to_pci_dev(dev);
483 struct pci_driver *drv = pci_dev->driver;
484
485 pm_runtime_resume(dev);
486
487 if (drv && drv->shutdown)
488 drv->shutdown(pci_dev);
489
490 /*
491 * If this is a kexec reboot, turn off Bus Master bit on the
492 * device to tell it to not continue to do DMA. Don't touch
493 * devices in D3cold or unknown states.
494 * If it is not a kexec reboot, firmware will hit the PCI
495 * devices with big hammer and stop their DMA any way.
496 */
497 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
498 pci_clear_master(pci_dev);
499}
500
501#ifdef CONFIG_PM
502
503/* Auxiliary functions used for system resume and run-time resume. */
504
505/**
506 * pci_restore_standard_config - restore standard config registers of PCI device
507 * @pci_dev: PCI device to handle
508 */
509static int pci_restore_standard_config(struct pci_dev *pci_dev)
510{
511 pci_update_current_state(pci_dev, PCI_UNKNOWN);
512
513 if (pci_dev->current_state != PCI_D0) {
514 int error = pci_set_power_state(pci_dev, PCI_D0);
515 if (error)
516 return error;
517 }
518
519 pci_restore_state(pci_dev);
520 pci_pme_restore(pci_dev);
521 return 0;
522}
523
524static void pci_pm_default_resume(struct pci_dev *pci_dev)
525{
526 pci_fixup_device(pci_fixup_resume, pci_dev);
527 pci_enable_wake(pci_dev, PCI_D0, false);
528}
529
530#endif
531
532#ifdef CONFIG_PM_SLEEP
533
534static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
535{
536 pci_power_up(pci_dev);
537 pci_update_current_state(pci_dev, PCI_D0);
538 pci_restore_state(pci_dev);
539 pci_pme_restore(pci_dev);
540}
541
542/*
543 * Default "suspend" method for devices that have no driver provided suspend,
544 * or not even a driver at all (second part).
545 */
546static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
547{
548 /*
549 * mark its power state as "unknown", since we don't know if
550 * e.g. the BIOS will change its device state when we suspend.
551 */
552 if (pci_dev->current_state == PCI_D0)
553 pci_dev->current_state = PCI_UNKNOWN;
554}
555
556/*
557 * Default "resume" method for devices that have no driver provided resume,
558 * or not even a driver at all (second part).
559 */
560static int pci_pm_reenable_device(struct pci_dev *pci_dev)
561{
562 int retval;
563
564 /* if the device was enabled before suspend, reenable */
565 retval = pci_reenable_device(pci_dev);
566 /*
567 * if the device was busmaster before the suspend, make it busmaster
568 * again
569 */
570 if (pci_dev->is_busmaster)
571 pci_set_master(pci_dev);
572
573 return retval;
574}
575
576static int pci_legacy_suspend(struct device *dev, pm_message_t state)
577{
578 struct pci_dev *pci_dev = to_pci_dev(dev);
579 struct pci_driver *drv = pci_dev->driver;
580
581 if (drv && drv->suspend) {
582 pci_power_t prev = pci_dev->current_state;
583 int error;
584
585 error = drv->suspend(pci_dev, state);
586 suspend_report_result(drv->suspend, error);
587 if (error)
588 return error;
589
590 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
591 && pci_dev->current_state != PCI_UNKNOWN) {
592 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
593 "PCI PM: Device state not saved by %pS\n",
594 drv->suspend);
595 }
596 }
597
598 pci_fixup_device(pci_fixup_suspend, pci_dev);
599
600 return 0;
601}
602
603static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
604{
605 struct pci_dev *pci_dev = to_pci_dev(dev);
606
607 if (!pci_dev->state_saved)
608 pci_save_state(pci_dev);
609
610 pci_pm_set_unknown_state(pci_dev);
611
612 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
613
614 return 0;
615}
616
617static int pci_legacy_resume(struct device *dev)
618{
619 struct pci_dev *pci_dev = to_pci_dev(dev);
620 struct pci_driver *drv = pci_dev->driver;
621
622 pci_fixup_device(pci_fixup_resume, pci_dev);
623
624 return drv && drv->resume ?
625 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
626}
627
628/* Auxiliary functions used by the new power management framework */
629
630static void pci_pm_default_suspend(struct pci_dev *pci_dev)
631{
632 /* Disable non-bridge devices without PM support */
633 if (!pci_has_subordinate(pci_dev))
634 pci_disable_enabled_device(pci_dev);
635}
636
637static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
638{
639 struct pci_driver *drv = pci_dev->driver;
640 bool ret = drv && (drv->suspend || drv->resume);
641
642 /*
643 * Legacy PM support is used by default, so warn if the new framework is
644 * supported as well. Drivers are supposed to support either the
645 * former, or the latter, but not both at the same time.
646 */
647 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
648 pci_dev->vendor, pci_dev->device);
649
650 return ret;
651}
652
653/* New power management framework */
654
655static int pci_pm_prepare(struct device *dev)
656{
657 struct pci_dev *pci_dev = to_pci_dev(dev);
658 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
659
660 if (pm && pm->prepare) {
661 int error = pm->prepare(dev);
662 if (error < 0)
663 return error;
664
665 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
666 return 0;
667 }
668 if (pci_dev_need_resume(pci_dev))
669 return 0;
670
671 /*
672 * The PME setting needs to be adjusted here in case the direct-complete
673 * optimization is used with respect to this device.
674 */
675 pci_dev_adjust_pme(pci_dev);
676 return 1;
677}
678
679static void pci_pm_complete(struct device *dev)
680{
681 struct pci_dev *pci_dev = to_pci_dev(dev);
682
683 pci_dev_complete_resume(pci_dev);
684 pm_generic_complete(dev);
685
686 /* Resume device if platform firmware has put it in reset-power-on */
687 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
688 pci_power_t pre_sleep_state = pci_dev->current_state;
689
690 pci_refresh_power_state(pci_dev);
691 /*
692 * On platforms with ACPI this check may also trigger for
693 * devices sharing power resources if one of those power
694 * resources has been activated as a result of a change of the
695 * power state of another device sharing it. However, in that
696 * case it is also better to resume the device, in general.
697 */
698 if (pci_dev->current_state < pre_sleep_state)
699 pm_request_resume(dev);
700 }
701}
702
703#else /* !CONFIG_PM_SLEEP */
704
705#define pci_pm_prepare NULL
706#define pci_pm_complete NULL
707
708#endif /* !CONFIG_PM_SLEEP */
709
710#ifdef CONFIG_SUSPEND
711static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
712{
713 /*
714 * Some BIOSes forget to clear Root PME Status bits after system
715 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
716 * Clear those bits now just in case (shouldn't hurt).
717 */
718 if (pci_is_pcie(pci_dev) &&
719 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
720 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
721 pcie_clear_root_pme_status(pci_dev);
722}
723
724static int pci_pm_suspend(struct device *dev)
725{
726 struct pci_dev *pci_dev = to_pci_dev(dev);
727 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
728
729 pci_dev->skip_bus_pm = false;
730
731 if (pci_has_legacy_pm_support(pci_dev))
732 return pci_legacy_suspend(dev, PMSG_SUSPEND);
733
734 if (!pm) {
735 pci_pm_default_suspend(pci_dev);
736 return 0;
737 }
738
739 /*
740 * PCI devices suspended at run time may need to be resumed at this
741 * point, because in general it may be necessary to reconfigure them for
742 * system suspend. Namely, if the device is expected to wake up the
743 * system from the sleep state, it may have to be reconfigured for this
744 * purpose, or if the device is not expected to wake up the system from
745 * the sleep state, it should be prevented from signaling wakeup events
746 * going forward.
747 *
748 * Also if the driver of the device does not indicate that its system
749 * suspend callbacks can cope with runtime-suspended devices, it is
750 * better to resume the device from runtime suspend here.
751 */
752 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
753 pci_dev_need_resume(pci_dev)) {
754 pm_runtime_resume(dev);
755 pci_dev->state_saved = false;
756 } else {
757 pci_dev_adjust_pme(pci_dev);
758 }
759
760 if (pm->suspend) {
761 pci_power_t prev = pci_dev->current_state;
762 int error;
763
764 error = pm->suspend(dev);
765 suspend_report_result(pm->suspend, error);
766 if (error)
767 return error;
768
769 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
770 && pci_dev->current_state != PCI_UNKNOWN) {
771 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
772 "PCI PM: State of device not saved by %pS\n",
773 pm->suspend);
774 }
775 }
776
777 return 0;
778}
779
780static int pci_pm_suspend_late(struct device *dev)
781{
782 if (dev_pm_skip_suspend(dev))
783 return 0;
784
785 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
786
787 return pm_generic_suspend_late(dev);
788}
789
790static int pci_pm_suspend_noirq(struct device *dev)
791{
792 struct pci_dev *pci_dev = to_pci_dev(dev);
793 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
794
795 if (dev_pm_skip_suspend(dev))
796 return 0;
797
798 if (pci_has_legacy_pm_support(pci_dev))
799 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
800
801 if (!pm) {
802 pci_save_state(pci_dev);
803 goto Fixup;
804 }
805
806 if (pm->suspend_noirq) {
807 pci_power_t prev = pci_dev->current_state;
808 int error;
809
810 error = pm->suspend_noirq(dev);
811 suspend_report_result(pm->suspend_noirq, error);
812 if (error)
813 return error;
814
815 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
816 && pci_dev->current_state != PCI_UNKNOWN) {
817 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
818 "PCI PM: State of device not saved by %pS\n",
819 pm->suspend_noirq);
820 goto Fixup;
821 }
822 }
823
824 if (pci_dev->skip_bus_pm) {
825 /*
826 * Either the device is a bridge with a child in D0 below it, or
827 * the function is running for the second time in a row without
828 * going through full resume, which is possible only during
829 * suspend-to-idle in a spurious wakeup case. The device should
830 * be in D0 at this point, but if it is a bridge, it may be
831 * necessary to save its state.
832 */
833 if (!pci_dev->state_saved)
834 pci_save_state(pci_dev);
835 } else if (!pci_dev->state_saved) {
836 pci_save_state(pci_dev);
837 if (pci_power_manageable(pci_dev))
838 pci_prepare_to_sleep(pci_dev);
839 }
840
841 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
842 pci_power_name(pci_dev->current_state));
843
844 if (pci_dev->current_state == PCI_D0) {
845 pci_dev->skip_bus_pm = true;
846 /*
847 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
848 * downstream device is in D0, so avoid changing the power state
849 * of the parent bridge by setting the skip_bus_pm flag for it.
850 */
851 if (pci_dev->bus->self)
852 pci_dev->bus->self->skip_bus_pm = true;
853 }
854
855 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
856 pci_dbg(pci_dev, "PCI PM: Skipped\n");
857 goto Fixup;
858 }
859
860 pci_pm_set_unknown_state(pci_dev);
861
862 /*
863 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
864 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
865 * hasn't been quiesced and tries to turn it off. If the controller
866 * is already in D3, this can hang or cause memory corruption.
867 *
868 * Since the value of the COMMAND register doesn't matter once the
869 * device has been suspended, we can safely set it to 0 here.
870 */
871 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
872 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
873
874Fixup:
875 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
876
877 /*
878 * If the target system sleep state is suspend-to-idle, it is sufficient
879 * to check whether or not the device's wakeup settings are good for
880 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
881 * pci_pm_complete() to take care of fixing up the device's state
882 * anyway, if need be.
883 */
884 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
885 dev->power.may_skip_resume = false;
886
887 return 0;
888}
889
890static int pci_pm_resume_noirq(struct device *dev)
891{
892 struct pci_dev *pci_dev = to_pci_dev(dev);
893 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
894 pci_power_t prev_state = pci_dev->current_state;
895 bool skip_bus_pm = pci_dev->skip_bus_pm;
896
897 if (dev_pm_skip_resume(dev))
898 return 0;
899
900 /*
901 * In the suspend-to-idle case, devices left in D0 during suspend will
902 * stay in D0, so it is not necessary to restore or update their
903 * configuration here and attempting to put them into D0 again is
904 * pointless, so avoid doing that.
905 */
906 if (!(skip_bus_pm && pm_suspend_no_platform()))
907 pci_pm_default_resume_early(pci_dev);
908
909 pci_fixup_device(pci_fixup_resume_early, pci_dev);
910 pcie_pme_root_status_cleanup(pci_dev);
911
912 if (!skip_bus_pm && prev_state == PCI_D3cold)
913 pci_bridge_wait_for_secondary_bus(pci_dev);
914
915 if (pci_has_legacy_pm_support(pci_dev))
916 return 0;
917
918 if (pm && pm->resume_noirq)
919 return pm->resume_noirq(dev);
920
921 return 0;
922}
923
924static int pci_pm_resume_early(struct device *dev)
925{
926 if (dev_pm_skip_resume(dev))
927 return 0;
928
929 return pm_generic_resume_early(dev);
930}
931
932static int pci_pm_resume(struct device *dev)
933{
934 struct pci_dev *pci_dev = to_pci_dev(dev);
935 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
936
937 /*
938 * This is necessary for the suspend error path in which resume is
939 * called without restoring the standard config registers of the device.
940 */
941 if (pci_dev->state_saved)
942 pci_restore_standard_config(pci_dev);
943
944 if (pci_has_legacy_pm_support(pci_dev))
945 return pci_legacy_resume(dev);
946
947 pci_pm_default_resume(pci_dev);
948
949 if (pm) {
950 if (pm->resume)
951 return pm->resume(dev);
952 } else {
953 pci_pm_reenable_device(pci_dev);
954 }
955
956 return 0;
957}
958
959#else /* !CONFIG_SUSPEND */
960
961#define pci_pm_suspend NULL
962#define pci_pm_suspend_late NULL
963#define pci_pm_suspend_noirq NULL
964#define pci_pm_resume NULL
965#define pci_pm_resume_early NULL
966#define pci_pm_resume_noirq NULL
967
968#endif /* !CONFIG_SUSPEND */
969
970#ifdef CONFIG_HIBERNATE_CALLBACKS
971
972/*
973 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
974 * a hibernate transition
975 */
976struct dev_pm_ops __weak pcibios_pm_ops;
977
978static int pci_pm_freeze(struct device *dev)
979{
980 struct pci_dev *pci_dev = to_pci_dev(dev);
981 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
982
983 if (pci_has_legacy_pm_support(pci_dev))
984 return pci_legacy_suspend(dev, PMSG_FREEZE);
985
986 if (!pm) {
987 pci_pm_default_suspend(pci_dev);
988 return 0;
989 }
990
991 /*
992 * Resume all runtime-suspended devices before creating a snapshot
993 * image of system memory, because the restore kernel generally cannot
994 * be expected to always handle them consistently and they need to be
995 * put into the runtime-active metastate during system resume anyway,
996 * so it is better to ensure that the state saved in the image will be
997 * always consistent with that.
998 */
999 pm_runtime_resume(dev);
1000 pci_dev->state_saved = false;
1001
1002 if (pm->freeze) {
1003 int error;
1004
1005 error = pm->freeze(dev);
1006 suspend_report_result(pm->freeze, error);
1007 if (error)
1008 return error;
1009 }
1010
1011 return 0;
1012}
1013
1014static int pci_pm_freeze_noirq(struct device *dev)
1015{
1016 struct pci_dev *pci_dev = to_pci_dev(dev);
1017 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1018
1019 if (pci_has_legacy_pm_support(pci_dev))
1020 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1021
1022 if (pm && pm->freeze_noirq) {
1023 int error;
1024
1025 error = pm->freeze_noirq(dev);
1026 suspend_report_result(pm->freeze_noirq, error);
1027 if (error)
1028 return error;
1029 }
1030
1031 if (!pci_dev->state_saved)
1032 pci_save_state(pci_dev);
1033
1034 pci_pm_set_unknown_state(pci_dev);
1035
1036 if (pcibios_pm_ops.freeze_noirq)
1037 return pcibios_pm_ops.freeze_noirq(dev);
1038
1039 return 0;
1040}
1041
1042static int pci_pm_thaw_noirq(struct device *dev)
1043{
1044 struct pci_dev *pci_dev = to_pci_dev(dev);
1045 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1046 int error;
1047
1048 if (pcibios_pm_ops.thaw_noirq) {
1049 error = pcibios_pm_ops.thaw_noirq(dev);
1050 if (error)
1051 return error;
1052 }
1053
1054 /*
1055 * The pm->thaw_noirq() callback assumes the device has been
1056 * returned to D0 and its config state has been restored.
1057 *
1058 * In addition, pci_restore_state() restores MSI-X state in MMIO
1059 * space, which requires the device to be in D0, so return it to D0
1060 * in case the driver's "freeze" callbacks put it into a low-power
1061 * state.
1062 */
1063 pci_set_power_state(pci_dev, PCI_D0);
1064 pci_restore_state(pci_dev);
1065
1066 if (pci_has_legacy_pm_support(pci_dev))
1067 return 0;
1068
1069 if (pm && pm->thaw_noirq)
1070 return pm->thaw_noirq(dev);
1071
1072 return 0;
1073}
1074
1075static int pci_pm_thaw(struct device *dev)
1076{
1077 struct pci_dev *pci_dev = to_pci_dev(dev);
1078 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1079 int error = 0;
1080
1081 if (pci_has_legacy_pm_support(pci_dev))
1082 return pci_legacy_resume(dev);
1083
1084 if (pm) {
1085 if (pm->thaw)
1086 error = pm->thaw(dev);
1087 } else {
1088 pci_pm_reenable_device(pci_dev);
1089 }
1090
1091 pci_dev->state_saved = false;
1092
1093 return error;
1094}
1095
1096static int pci_pm_poweroff(struct device *dev)
1097{
1098 struct pci_dev *pci_dev = to_pci_dev(dev);
1099 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1100
1101 if (pci_has_legacy_pm_support(pci_dev))
1102 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1103
1104 if (!pm) {
1105 pci_pm_default_suspend(pci_dev);
1106 return 0;
1107 }
1108
1109 /* The reason to do that is the same as in pci_pm_suspend(). */
1110 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1111 pci_dev_need_resume(pci_dev)) {
1112 pm_runtime_resume(dev);
1113 pci_dev->state_saved = false;
1114 } else {
1115 pci_dev_adjust_pme(pci_dev);
1116 }
1117
1118 if (pm->poweroff) {
1119 int error;
1120
1121 error = pm->poweroff(dev);
1122 suspend_report_result(pm->poweroff, error);
1123 if (error)
1124 return error;
1125 }
1126
1127 return 0;
1128}
1129
1130static int pci_pm_poweroff_late(struct device *dev)
1131{
1132 if (dev_pm_skip_suspend(dev))
1133 return 0;
1134
1135 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1136
1137 return pm_generic_poweroff_late(dev);
1138}
1139
1140static int pci_pm_poweroff_noirq(struct device *dev)
1141{
1142 struct pci_dev *pci_dev = to_pci_dev(dev);
1143 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1144
1145 if (dev_pm_skip_suspend(dev))
1146 return 0;
1147
1148 if (pci_has_legacy_pm_support(pci_dev))
1149 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1150
1151 if (!pm) {
1152 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1153 return 0;
1154 }
1155
1156 if (pm->poweroff_noirq) {
1157 int error;
1158
1159 error = pm->poweroff_noirq(dev);
1160 suspend_report_result(pm->poweroff_noirq, error);
1161 if (error)
1162 return error;
1163 }
1164
1165 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1166 pci_prepare_to_sleep(pci_dev);
1167
1168 /*
1169 * The reason for doing this here is the same as for the analogous code
1170 * in pci_pm_suspend_noirq().
1171 */
1172 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1173 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1174
1175 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1176
1177 if (pcibios_pm_ops.poweroff_noirq)
1178 return pcibios_pm_ops.poweroff_noirq(dev);
1179
1180 return 0;
1181}
1182
1183static int pci_pm_restore_noirq(struct device *dev)
1184{
1185 struct pci_dev *pci_dev = to_pci_dev(dev);
1186 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1187 int error;
1188
1189 if (pcibios_pm_ops.restore_noirq) {
1190 error = pcibios_pm_ops.restore_noirq(dev);
1191 if (error)
1192 return error;
1193 }
1194
1195 pci_pm_default_resume_early(pci_dev);
1196 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1197
1198 if (pci_has_legacy_pm_support(pci_dev))
1199 return 0;
1200
1201 if (pm && pm->restore_noirq)
1202 return pm->restore_noirq(dev);
1203
1204 return 0;
1205}
1206
1207static int pci_pm_restore(struct device *dev)
1208{
1209 struct pci_dev *pci_dev = to_pci_dev(dev);
1210 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1211
1212 /*
1213 * This is necessary for the hibernation error path in which restore is
1214 * called without restoring the standard config registers of the device.
1215 */
1216 if (pci_dev->state_saved)
1217 pci_restore_standard_config(pci_dev);
1218
1219 if (pci_has_legacy_pm_support(pci_dev))
1220 return pci_legacy_resume(dev);
1221
1222 pci_pm_default_resume(pci_dev);
1223
1224 if (pm) {
1225 if (pm->restore)
1226 return pm->restore(dev);
1227 } else {
1228 pci_pm_reenable_device(pci_dev);
1229 }
1230
1231 return 0;
1232}
1233
1234#else /* !CONFIG_HIBERNATE_CALLBACKS */
1235
1236#define pci_pm_freeze NULL
1237#define pci_pm_freeze_noirq NULL
1238#define pci_pm_thaw NULL
1239#define pci_pm_thaw_noirq NULL
1240#define pci_pm_poweroff NULL
1241#define pci_pm_poweroff_late NULL
1242#define pci_pm_poweroff_noirq NULL
1243#define pci_pm_restore NULL
1244#define pci_pm_restore_noirq NULL
1245
1246#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1247
1248#ifdef CONFIG_PM
1249
1250static int pci_pm_runtime_suspend(struct device *dev)
1251{
1252 struct pci_dev *pci_dev = to_pci_dev(dev);
1253 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1254 pci_power_t prev = pci_dev->current_state;
1255 int error;
1256
1257 /*
1258 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1259 * but it may go to D3cold when the bridge above it runtime suspends.
1260 * Save its config space in case that happens.
1261 */
1262 if (!pci_dev->driver) {
1263 pci_save_state(pci_dev);
1264 return 0;
1265 }
1266
1267 pci_dev->state_saved = false;
1268 if (pm && pm->runtime_suspend) {
1269 error = pm->runtime_suspend(dev);
1270 /*
1271 * -EBUSY and -EAGAIN is used to request the runtime PM core
1272 * to schedule a new suspend, so log the event only with debug
1273 * log level.
1274 */
1275 if (error == -EBUSY || error == -EAGAIN) {
1276 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1277 pm->runtime_suspend, error);
1278 return error;
1279 } else if (error) {
1280 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1281 pm->runtime_suspend, error);
1282 return error;
1283 }
1284 }
1285
1286 pci_fixup_device(pci_fixup_suspend, pci_dev);
1287
1288 if (pm && pm->runtime_suspend
1289 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1290 && pci_dev->current_state != PCI_UNKNOWN) {
1291 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1292 "PCI PM: State of device not saved by %pS\n",
1293 pm->runtime_suspend);
1294 return 0;
1295 }
1296
1297 if (!pci_dev->state_saved) {
1298 pci_save_state(pci_dev);
1299 pci_finish_runtime_suspend(pci_dev);
1300 }
1301
1302 return 0;
1303}
1304
1305static int pci_pm_runtime_resume(struct device *dev)
1306{
1307 struct pci_dev *pci_dev = to_pci_dev(dev);
1308 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1309 pci_power_t prev_state = pci_dev->current_state;
1310 int error = 0;
1311
1312 /*
1313 * Restoring config space is necessary even if the device is not bound
1314 * to a driver because although we left it in D0, it may have gone to
1315 * D3cold when the bridge above it runtime suspended.
1316 */
1317 pci_restore_standard_config(pci_dev);
1318
1319 if (!pci_dev->driver)
1320 return 0;
1321
1322 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1323 pci_pm_default_resume(pci_dev);
1324
1325 if (prev_state == PCI_D3cold)
1326 pci_bridge_wait_for_secondary_bus(pci_dev);
1327
1328 if (pm && pm->runtime_resume)
1329 error = pm->runtime_resume(dev);
1330
1331 pci_dev->runtime_d3cold = false;
1332
1333 return error;
1334}
1335
1336static int pci_pm_runtime_idle(struct device *dev)
1337{
1338 struct pci_dev *pci_dev = to_pci_dev(dev);
1339 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1340
1341 /*
1342 * If pci_dev->driver is not set (unbound), the device should
1343 * always remain in D0 regardless of the runtime PM status
1344 */
1345 if (!pci_dev->driver)
1346 return 0;
1347
1348 if (!pm)
1349 return -ENOSYS;
1350
1351 if (pm->runtime_idle)
1352 return pm->runtime_idle(dev);
1353
1354 return 0;
1355}
1356
1357static const struct dev_pm_ops pci_dev_pm_ops = {
1358 .prepare = pci_pm_prepare,
1359 .complete = pci_pm_complete,
1360 .suspend = pci_pm_suspend,
1361 .suspend_late = pci_pm_suspend_late,
1362 .resume = pci_pm_resume,
1363 .resume_early = pci_pm_resume_early,
1364 .freeze = pci_pm_freeze,
1365 .thaw = pci_pm_thaw,
1366 .poweroff = pci_pm_poweroff,
1367 .poweroff_late = pci_pm_poweroff_late,
1368 .restore = pci_pm_restore,
1369 .suspend_noirq = pci_pm_suspend_noirq,
1370 .resume_noirq = pci_pm_resume_noirq,
1371 .freeze_noirq = pci_pm_freeze_noirq,
1372 .thaw_noirq = pci_pm_thaw_noirq,
1373 .poweroff_noirq = pci_pm_poweroff_noirq,
1374 .restore_noirq = pci_pm_restore_noirq,
1375 .runtime_suspend = pci_pm_runtime_suspend,
1376 .runtime_resume = pci_pm_runtime_resume,
1377 .runtime_idle = pci_pm_runtime_idle,
1378};
1379
1380#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1381
1382#else /* !CONFIG_PM */
1383
1384#define pci_pm_runtime_suspend NULL
1385#define pci_pm_runtime_resume NULL
1386#define pci_pm_runtime_idle NULL
1387
1388#define PCI_PM_OPS_PTR NULL
1389
1390#endif /* !CONFIG_PM */
1391
1392/**
1393 * __pci_register_driver - register a new pci driver
1394 * @drv: the driver structure to register
1395 * @owner: owner module of drv
1396 * @mod_name: module name string
1397 *
1398 * Adds the driver structure to the list of registered drivers.
1399 * Returns a negative value on error, otherwise 0.
1400 * If no error occurred, the driver remains registered even if
1401 * no device was claimed during registration.
1402 */
1403int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1404 const char *mod_name)
1405{
1406 /* initialize common driver fields */
1407 drv->driver.name = drv->name;
1408 drv->driver.bus = &pci_bus_type;
1409 drv->driver.owner = owner;
1410 drv->driver.mod_name = mod_name;
1411 drv->driver.groups = drv->groups;
1412
1413 spin_lock_init(&drv->dynids.lock);
1414 INIT_LIST_HEAD(&drv->dynids.list);
1415
1416 /* register with core */
1417 return driver_register(&drv->driver);
1418}
1419EXPORT_SYMBOL(__pci_register_driver);
1420
1421/**
1422 * pci_unregister_driver - unregister a pci driver
1423 * @drv: the driver structure to unregister
1424 *
1425 * Deletes the driver structure from the list of registered PCI drivers,
1426 * gives it a chance to clean up by calling its remove() function for
1427 * each device it was responsible for, and marks those devices as
1428 * driverless.
1429 */
1430
1431void pci_unregister_driver(struct pci_driver *drv)
1432{
1433 driver_unregister(&drv->driver);
1434 pci_free_dynids(drv);
1435}
1436EXPORT_SYMBOL(pci_unregister_driver);
1437
1438static struct pci_driver pci_compat_driver = {
1439 .name = "compat"
1440};
1441
1442/**
1443 * pci_dev_driver - get the pci_driver of a device
1444 * @dev: the device to query
1445 *
1446 * Returns the appropriate pci_driver structure or %NULL if there is no
1447 * registered driver for the device.
1448 */
1449struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1450{
1451 if (dev->driver)
1452 return dev->driver;
1453 else {
1454 int i;
1455 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1456 if (dev->resource[i].flags & IORESOURCE_BUSY)
1457 return &pci_compat_driver;
1458 }
1459 return NULL;
1460}
1461EXPORT_SYMBOL(pci_dev_driver);
1462
1463/**
1464 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1465 * @dev: the PCI device structure to match against
1466 * @drv: the device driver to search for matching PCI device id structures
1467 *
1468 * Used by a driver to check whether a PCI device present in the
1469 * system is in its list of supported devices. Returns the matching
1470 * pci_device_id structure or %NULL if there is no match.
1471 */
1472static int pci_bus_match(struct device *dev, struct device_driver *drv)
1473{
1474 struct pci_dev *pci_dev = to_pci_dev(dev);
1475 struct pci_driver *pci_drv;
1476 const struct pci_device_id *found_id;
1477
1478 if (!pci_dev->match_driver)
1479 return 0;
1480
1481 pci_drv = to_pci_driver(drv);
1482 found_id = pci_match_device(pci_drv, pci_dev);
1483 if (found_id)
1484 return 1;
1485
1486 return 0;
1487}
1488
1489/**
1490 * pci_dev_get - increments the reference count of the pci device structure
1491 * @dev: the device being referenced
1492 *
1493 * Each live reference to a device should be refcounted.
1494 *
1495 * Drivers for PCI devices should normally record such references in
1496 * their probe() methods, when they bind to a device, and release
1497 * them by calling pci_dev_put(), in their disconnect() methods.
1498 *
1499 * A pointer to the device with the incremented reference counter is returned.
1500 */
1501struct pci_dev *pci_dev_get(struct pci_dev *dev)
1502{
1503 if (dev)
1504 get_device(&dev->dev);
1505 return dev;
1506}
1507EXPORT_SYMBOL(pci_dev_get);
1508
1509/**
1510 * pci_dev_put - release a use of the pci device structure
1511 * @dev: device that's been disconnected
1512 *
1513 * Must be called when a user of a device is finished with it. When the last
1514 * user of the device calls this function, the memory of the device is freed.
1515 */
1516void pci_dev_put(struct pci_dev *dev)
1517{
1518 if (dev)
1519 put_device(&dev->dev);
1520}
1521EXPORT_SYMBOL(pci_dev_put);
1522
1523static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1524{
1525 struct pci_dev *pdev;
1526
1527 if (!dev)
1528 return -ENODEV;
1529
1530 pdev = to_pci_dev(dev);
1531
1532 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1533 return -ENOMEM;
1534
1535 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1536 return -ENOMEM;
1537
1538 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1539 pdev->subsystem_device))
1540 return -ENOMEM;
1541
1542 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1543 return -ENOMEM;
1544
1545 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1546 pdev->vendor, pdev->device,
1547 pdev->subsystem_vendor, pdev->subsystem_device,
1548 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1549 (u8)(pdev->class)))
1550 return -ENOMEM;
1551
1552 return 0;
1553}
1554
1555#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
1556/**
1557 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1558 * @pdev: PCI device undergoing error recovery
1559 * @err_type: type of error event
1560 */
1561void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1562{
1563 int idx = 0;
1564 char *envp[3];
1565
1566 switch (err_type) {
1567 case PCI_ERS_RESULT_NONE:
1568 case PCI_ERS_RESULT_CAN_RECOVER:
1569 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1570 envp[idx++] = "DEVICE_ONLINE=0";
1571 break;
1572 case PCI_ERS_RESULT_RECOVERED:
1573 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1574 envp[idx++] = "DEVICE_ONLINE=1";
1575 break;
1576 case PCI_ERS_RESULT_DISCONNECT:
1577 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1578 envp[idx++] = "DEVICE_ONLINE=0";
1579 break;
1580 default:
1581 break;
1582 }
1583
1584 if (idx > 0) {
1585 envp[idx++] = NULL;
1586 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1587 }
1588}
1589#endif
1590
1591static int pci_bus_num_vf(struct device *dev)
1592{
1593 return pci_num_vf(to_pci_dev(dev));
1594}
1595
1596/**
1597 * pci_dma_configure - Setup DMA configuration
1598 * @dev: ptr to dev structure
1599 *
1600 * Function to update PCI devices's DMA configuration using the same
1601 * info from the OF node or ACPI node of host bridge's parent (if any).
1602 */
1603static int pci_dma_configure(struct device *dev)
1604{
1605 struct device *bridge;
1606 int ret = 0;
1607
1608 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1609
1610 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1611 bridge->parent->of_node) {
1612 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1613 } else if (has_acpi_companion(bridge)) {
1614 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1615
1616 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1617 }
1618
1619 pci_put_host_bridge_device(bridge);
1620 return ret;
1621}
1622
1623struct bus_type pci_bus_type = {
1624 .name = "pci",
1625 .match = pci_bus_match,
1626 .uevent = pci_uevent,
1627 .probe = pci_device_probe,
1628 .remove = pci_device_remove,
1629 .shutdown = pci_device_shutdown,
1630 .dev_groups = pci_dev_groups,
1631 .bus_groups = pci_bus_groups,
1632 .drv_groups = pci_drv_groups,
1633 .pm = PCI_PM_OPS_PTR,
1634 .num_vf = pci_bus_num_vf,
1635 .dma_configure = pci_dma_configure,
1636};
1637EXPORT_SYMBOL(pci_bus_type);
1638
1639#ifdef CONFIG_PCIEPORTBUS
1640static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1641{
1642 struct pcie_device *pciedev;
1643 struct pcie_port_service_driver *driver;
1644
1645 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1646 return 0;
1647
1648 pciedev = to_pcie_device(dev);
1649 driver = to_service_driver(drv);
1650
1651 if (driver->service != pciedev->service)
1652 return 0;
1653
1654 if (driver->port_type != PCIE_ANY_PORT &&
1655 driver->port_type != pci_pcie_type(pciedev->port))
1656 return 0;
1657
1658 return 1;
1659}
1660
1661struct bus_type pcie_port_bus_type = {
1662 .name = "pci_express",
1663 .match = pcie_port_bus_match,
1664};
1665EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1666#endif
1667
1668static int __init pci_driver_init(void)
1669{
1670 int ret;
1671
1672 ret = bus_register(&pci_bus_type);
1673 if (ret)
1674 return ret;
1675
1676#ifdef CONFIG_PCIEPORTBUS
1677 ret = bus_register(&pcie_port_bus_type);
1678 if (ret)
1679 return ret;
1680#endif
1681 dma_debug_add_bus(&pci_bus_type);
1682 return 0;
1683}
1684postcore_initcall(pci_driver_init);