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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 <linux/kexec.h>
23#include "pci.h"
24
25struct pci_dynid {
26 struct list_head node;
27 struct pci_device_id id;
28};
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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
93
94
95
96
97
98
99static ssize_t store_new_id(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
137
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)
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(new_id, S_IWUSR, NULL, store_new_id);
158
159
160
161
162
163
164
165
166
167static ssize_t store_remove_id(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 int 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 = 0;
194 break;
195 }
196 }
197 spin_unlock(&pdrv->dynids.lock);
198
199 if (retval)
200 return retval;
201 return count;
202}
203static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
204
205static struct attribute *pci_drv_attrs[] = {
206 &driver_attr_new_id.attr,
207 &driver_attr_remove_id.attr,
208 NULL,
209};
210ATTRIBUTE_GROUPS(pci_drv);
211
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220
221
222
223
224const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
225 struct pci_dev *dev)
226{
227 if (ids) {
228 while (ids->vendor || ids->subvendor || ids->class_mask) {
229 if (pci_match_one_device(ids, dev))
230 return ids;
231 ids++;
232 }
233 }
234 return NULL;
235}
236EXPORT_SYMBOL(pci_match_id);
237
238static const struct pci_device_id pci_device_id_any = {
239 .vendor = PCI_ANY_ID,
240 .device = PCI_ANY_ID,
241 .subvendor = PCI_ANY_ID,
242 .subdevice = PCI_ANY_ID,
243};
244
245
246
247
248
249
250
251
252
253
254static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
255 struct pci_dev *dev)
256{
257 struct pci_dynid *dynid;
258 const struct pci_device_id *found_id = NULL;
259
260
261 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
262 return NULL;
263
264
265 spin_lock(&drv->dynids.lock);
266 list_for_each_entry(dynid, &drv->dynids.list, node) {
267 if (pci_match_one_device(&dynid->id, dev)) {
268 found_id = &dynid->id;
269 break;
270 }
271 }
272 spin_unlock(&drv->dynids.lock);
273
274 if (!found_id)
275 found_id = pci_match_id(drv->id_table, dev);
276
277
278 if (!found_id && dev->driver_override)
279 found_id = &pci_device_id_any;
280
281 return found_id;
282}
283
284struct drv_dev_and_id {
285 struct pci_driver *drv;
286 struct pci_dev *dev;
287 const struct pci_device_id *id;
288};
289
290static long local_pci_probe(void *_ddi)
291{
292 struct drv_dev_and_id *ddi = _ddi;
293 struct pci_dev *pci_dev = ddi->dev;
294 struct pci_driver *pci_drv = ddi->drv;
295 struct device *dev = &pci_dev->dev;
296 int rc;
297
298
299
300
301
302
303
304
305
306 pm_runtime_get_sync(dev);
307 pci_dev->driver = pci_drv;
308 rc = pci_drv->probe(pci_dev, ddi->id);
309 if (!rc)
310 return rc;
311 if (rc < 0) {
312 pci_dev->driver = NULL;
313 pm_runtime_put_sync(dev);
314 return rc;
315 }
316
317
318
319
320 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
321 return 0;
322}
323
324static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
325 const struct pci_device_id *id)
326{
327 int error, node;
328 struct drv_dev_and_id ddi = { drv, dev, id };
329
330
331
332
333
334
335 node = dev_to_node(&dev->dev);
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350 if (node >= 0 && node != numa_node_id()) {
351 int cpu;
352
353 get_online_cpus();
354 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
355 if (cpu < nr_cpu_ids)
356 error = work_on_cpu(cpu, local_pci_probe, &ddi);
357 else
358 error = local_pci_probe(&ddi);
359 put_online_cpus();
360 } else
361 error = local_pci_probe(&ddi);
362
363 return error;
364}
365
366
367
368
369
370
371
372
373
374static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
375{
376 const struct pci_device_id *id;
377 int error = 0;
378
379 if (!pci_dev->driver && drv->probe) {
380 error = -ENODEV;
381
382 id = pci_match_device(drv, pci_dev);
383 if (id)
384 error = pci_call_probe(drv, pci_dev, id);
385 if (error >= 0)
386 error = 0;
387 }
388 return error;
389}
390
391static int pci_device_probe(struct device *dev)
392{
393 int error = 0;
394 struct pci_driver *drv;
395 struct pci_dev *pci_dev;
396
397 drv = to_pci_driver(dev->driver);
398 pci_dev = to_pci_dev(dev);
399 pci_dev_get(pci_dev);
400 error = __pci_device_probe(drv, pci_dev);
401 if (error)
402 pci_dev_put(pci_dev);
403
404 return error;
405}
406
407static int pci_device_remove(struct device *dev)
408{
409 struct pci_dev *pci_dev = to_pci_dev(dev);
410 struct pci_driver *drv = pci_dev->driver;
411
412 if (drv) {
413 if (drv->remove) {
414 pm_runtime_get_sync(dev);
415 drv->remove(pci_dev);
416 pm_runtime_put_noidle(dev);
417 }
418 pci_dev->driver = NULL;
419 }
420
421
422 pm_runtime_put_sync(dev);
423
424
425
426
427
428 if (pci_dev->current_state == PCI_D0)
429 pci_dev->current_state = PCI_UNKNOWN;
430
431
432
433
434
435
436
437
438
439
440 pci_dev_put(pci_dev);
441 return 0;
442}
443
444static void pci_device_shutdown(struct device *dev)
445{
446 struct pci_dev *pci_dev = to_pci_dev(dev);
447 struct pci_driver *drv = pci_dev->driver;
448
449 pm_runtime_resume(dev);
450
451 if (drv && drv->shutdown)
452 drv->shutdown(pci_dev);
453 pci_msi_shutdown(pci_dev);
454 pci_msix_shutdown(pci_dev);
455
456#ifdef CONFIG_KEXEC
457
458
459
460
461
462
463
464 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
465 pci_clear_master(pci_dev);
466#endif
467}
468
469#ifdef CONFIG_PM
470
471
472
473
474
475
476
477static int pci_restore_standard_config(struct pci_dev *pci_dev)
478{
479 pci_update_current_state(pci_dev, PCI_UNKNOWN);
480
481 if (pci_dev->current_state != PCI_D0) {
482 int error = pci_set_power_state(pci_dev, PCI_D0);
483 if (error)
484 return error;
485 }
486
487 pci_restore_state(pci_dev);
488 return 0;
489}
490
491#endif
492
493#ifdef CONFIG_PM_SLEEP
494
495static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
496{
497 pci_power_up(pci_dev);
498 pci_restore_state(pci_dev);
499 pci_fixup_device(pci_fixup_resume_early, pci_dev);
500}
501
502
503
504
505
506static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
507{
508
509
510
511
512 if (pci_dev->current_state == PCI_D0)
513 pci_dev->current_state = PCI_UNKNOWN;
514}
515
516
517
518
519
520static int pci_pm_reenable_device(struct pci_dev *pci_dev)
521{
522 int retval;
523
524
525 retval = pci_reenable_device(pci_dev);
526
527
528
529
530 if (pci_dev->is_busmaster)
531 pci_set_master(pci_dev);
532
533 return retval;
534}
535
536static int pci_legacy_suspend(struct device *dev, pm_message_t state)
537{
538 struct pci_dev *pci_dev = to_pci_dev(dev);
539 struct pci_driver *drv = pci_dev->driver;
540
541 if (drv && drv->suspend) {
542 pci_power_t prev = pci_dev->current_state;
543 int error;
544
545 error = drv->suspend(pci_dev, state);
546 suspend_report_result(drv->suspend, error);
547 if (error)
548 return error;
549
550 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
551 && pci_dev->current_state != PCI_UNKNOWN) {
552 WARN_ONCE(pci_dev->current_state != prev,
553 "PCI PM: Device state not saved by %pF\n",
554 drv->suspend);
555 }
556 }
557
558 pci_fixup_device(pci_fixup_suspend, pci_dev);
559
560 return 0;
561}
562
563static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
564{
565 struct pci_dev *pci_dev = to_pci_dev(dev);
566 struct pci_driver *drv = pci_dev->driver;
567
568 if (drv && drv->suspend_late) {
569 pci_power_t prev = pci_dev->current_state;
570 int error;
571
572 error = drv->suspend_late(pci_dev, state);
573 suspend_report_result(drv->suspend_late, error);
574 if (error)
575 return error;
576
577 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
578 && pci_dev->current_state != PCI_UNKNOWN) {
579 WARN_ONCE(pci_dev->current_state != prev,
580 "PCI PM: Device state not saved by %pF\n",
581 drv->suspend_late);
582 goto Fixup;
583 }
584 }
585
586 if (!pci_dev->state_saved)
587 pci_save_state(pci_dev);
588
589 pci_pm_set_unknown_state(pci_dev);
590
591Fixup:
592 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
593
594 return 0;
595}
596
597static int pci_legacy_resume_early(struct device *dev)
598{
599 struct pci_dev *pci_dev = to_pci_dev(dev);
600 struct pci_driver *drv = pci_dev->driver;
601
602 return drv && drv->resume_early ?
603 drv->resume_early(pci_dev) : 0;
604}
605
606static int pci_legacy_resume(struct device *dev)
607{
608 struct pci_dev *pci_dev = to_pci_dev(dev);
609 struct pci_driver *drv = pci_dev->driver;
610
611 pci_fixup_device(pci_fixup_resume, pci_dev);
612
613 return drv && drv->resume ?
614 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
615}
616
617
618
619static void pci_pm_default_resume(struct pci_dev *pci_dev)
620{
621 pci_fixup_device(pci_fixup_resume, pci_dev);
622
623 if (!pci_has_subordinate(pci_dev))
624 pci_enable_wake(pci_dev, PCI_D0, false);
625}
626
627static void pci_pm_default_suspend(struct pci_dev *pci_dev)
628{
629
630 if (!pci_has_subordinate(pci_dev))
631 pci_disable_enabled_device(pci_dev);
632}
633
634static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
635{
636 struct pci_driver *drv = pci_dev->driver;
637 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
638 || drv->resume_early);
639
640
641
642
643
644
645 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
646 drv->name, pci_dev->vendor, pci_dev->device);
647
648 return ret;
649}
650
651
652
653static int pci_pm_prepare(struct device *dev)
654{
655 struct device_driver *drv = dev->driver;
656
657
658
659
660
661 if (dev->power.ignore_children)
662 pm_runtime_resume(dev);
663
664 if (drv && drv->pm && drv->pm->prepare) {
665 int error = drv->pm->prepare(dev);
666 if (error)
667 return error;
668 }
669 return pci_dev_keep_suspended(to_pci_dev(dev));
670}
671
672
673#else
674
675#define pci_pm_prepare NULL
676
677#endif
678
679#ifdef CONFIG_SUSPEND
680
681static int pci_pm_suspend(struct device *dev)
682{
683 struct pci_dev *pci_dev = to_pci_dev(dev);
684 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
685
686 if (pci_has_legacy_pm_support(pci_dev))
687 return pci_legacy_suspend(dev, PMSG_SUSPEND);
688
689 if (!pm) {
690 pci_pm_default_suspend(pci_dev);
691 goto Fixup;
692 }
693
694
695
696
697
698
699
700
701
702 pm_runtime_resume(dev);
703
704 pci_dev->state_saved = false;
705 if (pm->suspend) {
706 pci_power_t prev = pci_dev->current_state;
707 int error;
708
709 error = pm->suspend(dev);
710 suspend_report_result(pm->suspend, error);
711 if (error)
712 return error;
713
714 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
715 && pci_dev->current_state != PCI_UNKNOWN) {
716 WARN_ONCE(pci_dev->current_state != prev,
717 "PCI PM: State of device not saved by %pF\n",
718 pm->suspend);
719 }
720 }
721
722 Fixup:
723 pci_fixup_device(pci_fixup_suspend, pci_dev);
724
725 return 0;
726}
727
728static int pci_pm_suspend_noirq(struct device *dev)
729{
730 struct pci_dev *pci_dev = to_pci_dev(dev);
731 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
732
733 if (pci_has_legacy_pm_support(pci_dev))
734 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
735
736 if (!pm) {
737 pci_save_state(pci_dev);
738 goto Fixup;
739 }
740
741 if (pm->suspend_noirq) {
742 pci_power_t prev = pci_dev->current_state;
743 int error;
744
745 error = pm->suspend_noirq(dev);
746 suspend_report_result(pm->suspend_noirq, error);
747 if (error)
748 return error;
749
750 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
751 && pci_dev->current_state != PCI_UNKNOWN) {
752 WARN_ONCE(pci_dev->current_state != prev,
753 "PCI PM: State of device not saved by %pF\n",
754 pm->suspend_noirq);
755 goto Fixup;
756 }
757 }
758
759 if (!pci_dev->state_saved) {
760 pci_save_state(pci_dev);
761 if (!pci_has_subordinate(pci_dev))
762 pci_prepare_to_sleep(pci_dev);
763 }
764
765 pci_pm_set_unknown_state(pci_dev);
766
767
768
769
770
771
772
773
774
775
776 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
777 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
778
779Fixup:
780 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
781
782 return 0;
783}
784
785static int pci_pm_resume_noirq(struct device *dev)
786{
787 struct pci_dev *pci_dev = to_pci_dev(dev);
788 struct device_driver *drv = dev->driver;
789 int error = 0;
790
791 pci_pm_default_resume_early(pci_dev);
792
793 if (pci_has_legacy_pm_support(pci_dev))
794 return pci_legacy_resume_early(dev);
795
796 if (drv && drv->pm && drv->pm->resume_noirq)
797 error = drv->pm->resume_noirq(dev);
798
799 return error;
800}
801
802static int pci_pm_resume(struct device *dev)
803{
804 struct pci_dev *pci_dev = to_pci_dev(dev);
805 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
806 int error = 0;
807
808
809
810
811
812 if (pci_dev->state_saved)
813 pci_restore_standard_config(pci_dev);
814
815 if (pci_has_legacy_pm_support(pci_dev))
816 return pci_legacy_resume(dev);
817
818 pci_pm_default_resume(pci_dev);
819
820 if (pm) {
821 if (pm->resume)
822 error = pm->resume(dev);
823 } else {
824 pci_pm_reenable_device(pci_dev);
825 }
826
827 return error;
828}
829
830#else
831
832#define pci_pm_suspend NULL
833#define pci_pm_suspend_noirq NULL
834#define pci_pm_resume NULL
835#define pci_pm_resume_noirq NULL
836
837#endif
838
839#ifdef CONFIG_HIBERNATE_CALLBACKS
840
841
842
843
844
845
846struct dev_pm_ops __weak pcibios_pm_ops;
847
848static int pci_pm_freeze(struct device *dev)
849{
850 struct pci_dev *pci_dev = to_pci_dev(dev);
851 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
852
853 if (pci_has_legacy_pm_support(pci_dev))
854 return pci_legacy_suspend(dev, PMSG_FREEZE);
855
856 if (!pm) {
857 pci_pm_default_suspend(pci_dev);
858 return 0;
859 }
860
861
862
863
864
865
866
867 pm_runtime_resume(dev);
868
869 pci_dev->state_saved = false;
870 if (pm->freeze) {
871 int error;
872
873 error = pm->freeze(dev);
874 suspend_report_result(pm->freeze, error);
875 if (error)
876 return error;
877 }
878
879 if (pcibios_pm_ops.freeze)
880 return pcibios_pm_ops.freeze(dev);
881
882 return 0;
883}
884
885static int pci_pm_freeze_noirq(struct device *dev)
886{
887 struct pci_dev *pci_dev = to_pci_dev(dev);
888 struct device_driver *drv = dev->driver;
889
890 if (pci_has_legacy_pm_support(pci_dev))
891 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
892
893 if (drv && drv->pm && drv->pm->freeze_noirq) {
894 int error;
895
896 error = drv->pm->freeze_noirq(dev);
897 suspend_report_result(drv->pm->freeze_noirq, error);
898 if (error)
899 return error;
900 }
901
902 if (!pci_dev->state_saved)
903 pci_save_state(pci_dev);
904
905 pci_pm_set_unknown_state(pci_dev);
906
907 if (pcibios_pm_ops.freeze_noirq)
908 return pcibios_pm_ops.freeze_noirq(dev);
909
910 return 0;
911}
912
913static int pci_pm_thaw_noirq(struct device *dev)
914{
915 struct pci_dev *pci_dev = to_pci_dev(dev);
916 struct device_driver *drv = dev->driver;
917 int error = 0;
918
919 if (pcibios_pm_ops.thaw_noirq) {
920 error = pcibios_pm_ops.thaw_noirq(dev);
921 if (error)
922 return error;
923 }
924
925 if (pci_has_legacy_pm_support(pci_dev))
926 return pci_legacy_resume_early(dev);
927
928 pci_update_current_state(pci_dev, PCI_D0);
929
930 if (drv && drv->pm && drv->pm->thaw_noirq)
931 error = drv->pm->thaw_noirq(dev);
932
933 return error;
934}
935
936static int pci_pm_thaw(struct device *dev)
937{
938 struct pci_dev *pci_dev = to_pci_dev(dev);
939 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
940 int error = 0;
941
942 if (pcibios_pm_ops.thaw) {
943 error = pcibios_pm_ops.thaw(dev);
944 if (error)
945 return error;
946 }
947
948 if (pci_has_legacy_pm_support(pci_dev))
949 return pci_legacy_resume(dev);
950
951 if (pm) {
952 if (pm->thaw)
953 error = pm->thaw(dev);
954 } else {
955 pci_pm_reenable_device(pci_dev);
956 }
957
958 pci_dev->state_saved = false;
959
960 return error;
961}
962
963static int pci_pm_poweroff(struct device *dev)
964{
965 struct pci_dev *pci_dev = to_pci_dev(dev);
966 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
967
968 if (pci_has_legacy_pm_support(pci_dev))
969 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
970
971 if (!pm) {
972 pci_pm_default_suspend(pci_dev);
973 goto Fixup;
974 }
975
976
977 pm_runtime_resume(dev);
978
979 pci_dev->state_saved = false;
980 if (pm->poweroff) {
981 int error;
982
983 error = pm->poweroff(dev);
984 suspend_report_result(pm->poweroff, error);
985 if (error)
986 return error;
987 }
988
989 Fixup:
990 pci_fixup_device(pci_fixup_suspend, pci_dev);
991
992 if (pcibios_pm_ops.poweroff)
993 return pcibios_pm_ops.poweroff(dev);
994
995 return 0;
996}
997
998static int pci_pm_poweroff_noirq(struct device *dev)
999{
1000 struct pci_dev *pci_dev = to_pci_dev(dev);
1001 struct device_driver *drv = dev->driver;
1002
1003 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1004 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1005
1006 if (!drv || !drv->pm) {
1007 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1008 return 0;
1009 }
1010
1011 if (drv->pm->poweroff_noirq) {
1012 int error;
1013
1014 error = drv->pm->poweroff_noirq(dev);
1015 suspend_report_result(drv->pm->poweroff_noirq, error);
1016 if (error)
1017 return error;
1018 }
1019
1020 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1021 pci_prepare_to_sleep(pci_dev);
1022
1023
1024
1025
1026
1027 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1028 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1029
1030 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1031
1032 if (pcibios_pm_ops.poweroff_noirq)
1033 return pcibios_pm_ops.poweroff_noirq(dev);
1034
1035 return 0;
1036}
1037
1038static int pci_pm_restore_noirq(struct device *dev)
1039{
1040 struct pci_dev *pci_dev = to_pci_dev(dev);
1041 struct device_driver *drv = dev->driver;
1042 int error = 0;
1043
1044 if (pcibios_pm_ops.restore_noirq) {
1045 error = pcibios_pm_ops.restore_noirq(dev);
1046 if (error)
1047 return error;
1048 }
1049
1050 pci_pm_default_resume_early(pci_dev);
1051
1052 if (pci_has_legacy_pm_support(pci_dev))
1053 return pci_legacy_resume_early(dev);
1054
1055 if (drv && drv->pm && drv->pm->restore_noirq)
1056 error = drv->pm->restore_noirq(dev);
1057
1058 return error;
1059}
1060
1061static int pci_pm_restore(struct device *dev)
1062{
1063 struct pci_dev *pci_dev = to_pci_dev(dev);
1064 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1065 int error = 0;
1066
1067 if (pcibios_pm_ops.restore) {
1068 error = pcibios_pm_ops.restore(dev);
1069 if (error)
1070 return error;
1071 }
1072
1073
1074
1075
1076
1077 if (pci_dev->state_saved)
1078 pci_restore_standard_config(pci_dev);
1079
1080 if (pci_has_legacy_pm_support(pci_dev))
1081 return pci_legacy_resume(dev);
1082
1083 pci_pm_default_resume(pci_dev);
1084
1085 if (pm) {
1086 if (pm->restore)
1087 error = pm->restore(dev);
1088 } else {
1089 pci_pm_reenable_device(pci_dev);
1090 }
1091
1092 return error;
1093}
1094
1095#else
1096
1097#define pci_pm_freeze NULL
1098#define pci_pm_freeze_noirq NULL
1099#define pci_pm_thaw NULL
1100#define pci_pm_thaw_noirq NULL
1101#define pci_pm_poweroff NULL
1102#define pci_pm_poweroff_noirq NULL
1103#define pci_pm_restore NULL
1104#define pci_pm_restore_noirq NULL
1105
1106#endif
1107
1108#ifdef CONFIG_PM
1109
1110static int pci_pm_runtime_suspend(struct device *dev)
1111{
1112 struct pci_dev *pci_dev = to_pci_dev(dev);
1113 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1114 pci_power_t prev = pci_dev->current_state;
1115 int error;
1116
1117
1118
1119
1120
1121 if (!pci_dev->driver)
1122 return 0;
1123
1124 if (!pm || !pm->runtime_suspend)
1125 return -ENOSYS;
1126
1127 pci_dev->state_saved = false;
1128 pci_dev->no_d3cold = false;
1129 error = pm->runtime_suspend(dev);
1130 suspend_report_result(pm->runtime_suspend, error);
1131 if (error)
1132 return error;
1133 if (!pci_dev->d3cold_allowed)
1134 pci_dev->no_d3cold = true;
1135
1136 pci_fixup_device(pci_fixup_suspend, pci_dev);
1137
1138 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1139 && pci_dev->current_state != PCI_UNKNOWN) {
1140 WARN_ONCE(pci_dev->current_state != prev,
1141 "PCI PM: State of device not saved by %pF\n",
1142 pm->runtime_suspend);
1143 return 0;
1144 }
1145
1146 if (!pci_dev->state_saved) {
1147 pci_save_state(pci_dev);
1148 pci_finish_runtime_suspend(pci_dev);
1149 }
1150
1151 return 0;
1152}
1153
1154static int pci_pm_runtime_resume(struct device *dev)
1155{
1156 int rc;
1157 struct pci_dev *pci_dev = to_pci_dev(dev);
1158 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1159
1160
1161
1162
1163
1164 if (!pci_dev->driver)
1165 return 0;
1166
1167 if (!pm || !pm->runtime_resume)
1168 return -ENOSYS;
1169
1170 pci_restore_standard_config(pci_dev);
1171 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1172 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1173 pci_fixup_device(pci_fixup_resume, pci_dev);
1174
1175 rc = pm->runtime_resume(dev);
1176
1177 pci_dev->runtime_d3cold = false;
1178
1179 return rc;
1180}
1181
1182static int pci_pm_runtime_idle(struct device *dev)
1183{
1184 struct pci_dev *pci_dev = to_pci_dev(dev);
1185 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1186 int ret = 0;
1187
1188
1189
1190
1191
1192 if (!pci_dev->driver)
1193 return 0;
1194
1195 if (!pm)
1196 return -ENOSYS;
1197
1198 if (pm->runtime_idle)
1199 ret = pm->runtime_idle(dev);
1200
1201 return ret;
1202}
1203
1204static const struct dev_pm_ops pci_dev_pm_ops = {
1205 .prepare = pci_pm_prepare,
1206 .suspend = pci_pm_suspend,
1207 .resume = pci_pm_resume,
1208 .freeze = pci_pm_freeze,
1209 .thaw = pci_pm_thaw,
1210 .poweroff = pci_pm_poweroff,
1211 .restore = pci_pm_restore,
1212 .suspend_noirq = pci_pm_suspend_noirq,
1213 .resume_noirq = pci_pm_resume_noirq,
1214 .freeze_noirq = pci_pm_freeze_noirq,
1215 .thaw_noirq = pci_pm_thaw_noirq,
1216 .poweroff_noirq = pci_pm_poweroff_noirq,
1217 .restore_noirq = pci_pm_restore_noirq,
1218 .runtime_suspend = pci_pm_runtime_suspend,
1219 .runtime_resume = pci_pm_runtime_resume,
1220 .runtime_idle = pci_pm_runtime_idle,
1221};
1222
1223#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1224
1225#else
1226
1227#define pci_pm_runtime_suspend NULL
1228#define pci_pm_runtime_resume NULL
1229#define pci_pm_runtime_idle NULL
1230
1231#define PCI_PM_OPS_PTR NULL
1232
1233#endif
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1247 const char *mod_name)
1248{
1249
1250 drv->driver.name = drv->name;
1251 drv->driver.bus = &pci_bus_type;
1252 drv->driver.owner = owner;
1253 drv->driver.mod_name = mod_name;
1254
1255 spin_lock_init(&drv->dynids.lock);
1256 INIT_LIST_HEAD(&drv->dynids.list);
1257
1258
1259 return driver_register(&drv->driver);
1260}
1261EXPORT_SYMBOL(__pci_register_driver);
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273void pci_unregister_driver(struct pci_driver *drv)
1274{
1275 driver_unregister(&drv->driver);
1276 pci_free_dynids(drv);
1277}
1278EXPORT_SYMBOL(pci_unregister_driver);
1279
1280static struct pci_driver pci_compat_driver = {
1281 .name = "compat"
1282};
1283
1284
1285
1286
1287
1288
1289
1290
1291struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1292{
1293 if (dev->driver)
1294 return dev->driver;
1295 else {
1296 int i;
1297 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1298 if (dev->resource[i].flags & IORESOURCE_BUSY)
1299 return &pci_compat_driver;
1300 }
1301 return NULL;
1302}
1303EXPORT_SYMBOL(pci_dev_driver);
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314static int pci_bus_match(struct device *dev, struct device_driver *drv)
1315{
1316 struct pci_dev *pci_dev = to_pci_dev(dev);
1317 struct pci_driver *pci_drv;
1318 const struct pci_device_id *found_id;
1319
1320 if (!pci_dev->match_driver)
1321 return 0;
1322
1323 pci_drv = to_pci_driver(drv);
1324 found_id = pci_match_device(pci_drv, pci_dev);
1325 if (found_id)
1326 return 1;
1327
1328 return 0;
1329}
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343struct pci_dev *pci_dev_get(struct pci_dev *dev)
1344{
1345 if (dev)
1346 get_device(&dev->dev);
1347 return dev;
1348}
1349EXPORT_SYMBOL(pci_dev_get);
1350
1351
1352
1353
1354
1355
1356
1357
1358void pci_dev_put(struct pci_dev *dev)
1359{
1360 if (dev)
1361 put_device(&dev->dev);
1362}
1363EXPORT_SYMBOL(pci_dev_put);
1364
1365static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1366{
1367 struct pci_dev *pdev;
1368
1369 if (!dev)
1370 return -ENODEV;
1371
1372 pdev = to_pci_dev(dev);
1373
1374 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1375 return -ENOMEM;
1376
1377 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1378 return -ENOMEM;
1379
1380 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1381 pdev->subsystem_device))
1382 return -ENOMEM;
1383
1384 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1385 return -ENOMEM;
1386
1387 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1388 pdev->vendor, pdev->device,
1389 pdev->subsystem_vendor, pdev->subsystem_device,
1390 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1391 (u8)(pdev->class)))
1392 return -ENOMEM;
1393
1394 return 0;
1395}
1396
1397struct bus_type pci_bus_type = {
1398 .name = "pci",
1399 .match = pci_bus_match,
1400 .uevent = pci_uevent,
1401 .probe = pci_device_probe,
1402 .remove = pci_device_remove,
1403 .shutdown = pci_device_shutdown,
1404 .dev_groups = pci_dev_groups,
1405 .bus_groups = pci_bus_groups,
1406 .drv_groups = pci_drv_groups,
1407 .pm = PCI_PM_OPS_PTR,
1408};
1409EXPORT_SYMBOL(pci_bus_type);
1410
1411static int __init pci_driver_init(void)
1412{
1413 return bus_register(&pci_bus_type);
1414}
1415postcore_initcall(pci_driver_init);
1416