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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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218
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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
307 pm_runtime_get_sync(dev);
308 pci_dev->driver = pci_drv;
309 rc = pci_drv->probe(pci_dev, ddi->id);
310 if (!rc)
311 return rc;
312 if (rc < 0) {
313 pci_dev->driver = NULL;
314 pm_runtime_put_sync(dev);
315 return rc;
316 }
317
318
319
320
321 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
322 return 0;
323}
324
325static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
326 const struct pci_device_id *id)
327{
328 int error, node;
329 struct drv_dev_and_id ddi = { drv, dev, id };
330
331
332
333
334
335
336 node = dev_to_node(&dev->dev);
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351 if (node >= 0 && node != numa_node_id()) {
352 int cpu;
353
354 get_online_cpus();
355 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
356 if (cpu < nr_cpu_ids)
357 error = work_on_cpu(cpu, local_pci_probe, &ddi);
358 else
359 error = local_pci_probe(&ddi);
360 put_online_cpus();
361 } else
362 error = local_pci_probe(&ddi);
363
364 return error;
365}
366
367
368
369
370
371
372
373
374
375static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
376{
377 const struct pci_device_id *id;
378 int error = 0;
379
380 if (!pci_dev->driver && drv->probe) {
381 error = -ENODEV;
382
383 id = pci_match_device(drv, pci_dev);
384 if (id)
385 error = pci_call_probe(drv, pci_dev, id);
386 if (error >= 0)
387 error = 0;
388 }
389 return error;
390}
391
392int __weak pcibios_alloc_irq(struct pci_dev *dev)
393{
394 return 0;
395}
396
397void __weak pcibios_free_irq(struct pci_dev *dev)
398{
399}
400
401static int pci_device_probe(struct device *dev)
402{
403 int error;
404 struct pci_dev *pci_dev = to_pci_dev(dev);
405 struct pci_driver *drv = to_pci_driver(dev->driver);
406
407 error = pcibios_alloc_irq(pci_dev);
408 if (error < 0)
409 return error;
410
411 pci_dev_get(pci_dev);
412 error = __pci_device_probe(drv, pci_dev);
413 if (error) {
414 pcibios_free_irq(pci_dev);
415 pci_dev_put(pci_dev);
416 }
417
418 return error;
419}
420
421static int pci_device_remove(struct device *dev)
422{
423 struct pci_dev *pci_dev = to_pci_dev(dev);
424 struct pci_driver *drv = pci_dev->driver;
425
426 if (drv) {
427 if (drv->remove) {
428 pm_runtime_get_sync(dev);
429 drv->remove(pci_dev);
430 pm_runtime_put_noidle(dev);
431 }
432 pcibios_free_irq(pci_dev);
433 pci_dev->driver = NULL;
434 }
435
436
437 pm_runtime_put_sync(dev);
438
439
440
441
442
443 if (pci_dev->current_state == PCI_D0)
444 pci_dev->current_state = PCI_UNKNOWN;
445
446
447
448
449
450
451
452
453
454
455 pci_dev_put(pci_dev);
456 return 0;
457}
458
459static void pci_device_shutdown(struct device *dev)
460{
461 struct pci_dev *pci_dev = to_pci_dev(dev);
462 struct pci_driver *drv = pci_dev->driver;
463
464 pm_runtime_resume(dev);
465
466 if (drv && drv->shutdown)
467 drv->shutdown(pci_dev);
468 pci_msi_shutdown(pci_dev);
469 pci_msix_shutdown(pci_dev);
470
471#ifdef CONFIG_KEXEC_CORE
472
473
474
475
476
477
478
479 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
480 pci_clear_master(pci_dev);
481#endif
482}
483
484#ifdef CONFIG_PM
485
486
487
488
489
490
491
492static int pci_restore_standard_config(struct pci_dev *pci_dev)
493{
494 pci_update_current_state(pci_dev, PCI_UNKNOWN);
495
496 if (pci_dev->current_state != PCI_D0) {
497 int error = pci_set_power_state(pci_dev, PCI_D0);
498 if (error)
499 return error;
500 }
501
502 pci_restore_state(pci_dev);
503 return 0;
504}
505
506#endif
507
508#ifdef CONFIG_PM_SLEEP
509
510static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
511{
512 pci_power_up(pci_dev);
513 pci_restore_state(pci_dev);
514 pci_fixup_device(pci_fixup_resume_early, pci_dev);
515}
516
517
518
519
520
521static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
522{
523
524
525
526
527 if (pci_dev->current_state == PCI_D0)
528 pci_dev->current_state = PCI_UNKNOWN;
529}
530
531
532
533
534
535static int pci_pm_reenable_device(struct pci_dev *pci_dev)
536{
537 int retval;
538
539
540 retval = pci_reenable_device(pci_dev);
541
542
543
544
545 if (pci_dev->is_busmaster)
546 pci_set_master(pci_dev);
547
548 return retval;
549}
550
551static int pci_legacy_suspend(struct device *dev, pm_message_t state)
552{
553 struct pci_dev *pci_dev = to_pci_dev(dev);
554 struct pci_driver *drv = pci_dev->driver;
555
556 if (drv && drv->suspend) {
557 pci_power_t prev = pci_dev->current_state;
558 int error;
559
560 error = drv->suspend(pci_dev, state);
561 suspend_report_result(drv->suspend, error);
562 if (error)
563 return error;
564
565 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
566 && pci_dev->current_state != PCI_UNKNOWN) {
567 WARN_ONCE(pci_dev->current_state != prev,
568 "PCI PM: Device state not saved by %pF\n",
569 drv->suspend);
570 }
571 }
572
573 pci_fixup_device(pci_fixup_suspend, pci_dev);
574
575 return 0;
576}
577
578static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
579{
580 struct pci_dev *pci_dev = to_pci_dev(dev);
581 struct pci_driver *drv = pci_dev->driver;
582
583 if (drv && drv->suspend_late) {
584 pci_power_t prev = pci_dev->current_state;
585 int error;
586
587 error = drv->suspend_late(pci_dev, state);
588 suspend_report_result(drv->suspend_late, error);
589 if (error)
590 return error;
591
592 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
593 && pci_dev->current_state != PCI_UNKNOWN) {
594 WARN_ONCE(pci_dev->current_state != prev,
595 "PCI PM: Device state not saved by %pF\n",
596 drv->suspend_late);
597 goto Fixup;
598 }
599 }
600
601 if (!pci_dev->state_saved)
602 pci_save_state(pci_dev);
603
604 pci_pm_set_unknown_state(pci_dev);
605
606Fixup:
607 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
608
609 return 0;
610}
611
612static int pci_legacy_resume_early(struct device *dev)
613{
614 struct pci_dev *pci_dev = to_pci_dev(dev);
615 struct pci_driver *drv = pci_dev->driver;
616
617 return drv && drv->resume_early ?
618 drv->resume_early(pci_dev) : 0;
619}
620
621static int pci_legacy_resume(struct device *dev)
622{
623 struct pci_dev *pci_dev = to_pci_dev(dev);
624 struct pci_driver *drv = pci_dev->driver;
625
626 pci_fixup_device(pci_fixup_resume, pci_dev);
627
628 return drv && drv->resume ?
629 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
630}
631
632
633
634static void pci_pm_default_resume(struct pci_dev *pci_dev)
635{
636 pci_fixup_device(pci_fixup_resume, pci_dev);
637
638 if (!pci_has_subordinate(pci_dev))
639 pci_enable_wake(pci_dev, PCI_D0, false);
640}
641
642static void pci_pm_default_suspend(struct pci_dev *pci_dev)
643{
644
645 if (!pci_has_subordinate(pci_dev))
646 pci_disable_enabled_device(pci_dev);
647}
648
649static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
650{
651 struct pci_driver *drv = pci_dev->driver;
652 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
653 || drv->resume_early);
654
655
656
657
658
659
660 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
661 drv->name, pci_dev->vendor, pci_dev->device);
662
663 return ret;
664}
665
666
667
668static int pci_pm_prepare(struct device *dev)
669{
670 struct device_driver *drv = dev->driver;
671
672
673
674
675
676 if (dev->power.ignore_children)
677 pm_runtime_resume(dev);
678
679 if (drv && drv->pm && drv->pm->prepare) {
680 int error = drv->pm->prepare(dev);
681 if (error)
682 return error;
683 }
684 return pci_dev_keep_suspended(to_pci_dev(dev));
685}
686
687
688#else
689
690#define pci_pm_prepare NULL
691
692#endif
693
694#ifdef CONFIG_SUSPEND
695
696static int pci_pm_suspend(struct device *dev)
697{
698 struct pci_dev *pci_dev = to_pci_dev(dev);
699 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
700
701 if (pci_has_legacy_pm_support(pci_dev))
702 return pci_legacy_suspend(dev, PMSG_SUSPEND);
703
704 if (!pm) {
705 pci_pm_default_suspend(pci_dev);
706 goto Fixup;
707 }
708
709
710
711
712
713
714
715
716
717 pm_runtime_resume(dev);
718
719 pci_dev->state_saved = false;
720 if (pm->suspend) {
721 pci_power_t prev = pci_dev->current_state;
722 int error;
723
724 error = pm->suspend(dev);
725 suspend_report_result(pm->suspend, error);
726 if (error)
727 return error;
728
729 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
730 && pci_dev->current_state != PCI_UNKNOWN) {
731 WARN_ONCE(pci_dev->current_state != prev,
732 "PCI PM: State of device not saved by %pF\n",
733 pm->suspend);
734 }
735 }
736
737 Fixup:
738 pci_fixup_device(pci_fixup_suspend, pci_dev);
739
740 return 0;
741}
742
743static int pci_pm_suspend_noirq(struct device *dev)
744{
745 struct pci_dev *pci_dev = to_pci_dev(dev);
746 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
747
748 if (pci_has_legacy_pm_support(pci_dev))
749 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
750
751 if (!pm) {
752 pci_save_state(pci_dev);
753 goto Fixup;
754 }
755
756 if (pm->suspend_noirq) {
757 pci_power_t prev = pci_dev->current_state;
758 int error;
759
760 error = pm->suspend_noirq(dev);
761 suspend_report_result(pm->suspend_noirq, error);
762 if (error)
763 return error;
764
765 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
766 && pci_dev->current_state != PCI_UNKNOWN) {
767 WARN_ONCE(pci_dev->current_state != prev,
768 "PCI PM: State of device not saved by %pF\n",
769 pm->suspend_noirq);
770 goto Fixup;
771 }
772 }
773
774 if (!pci_dev->state_saved) {
775 pci_save_state(pci_dev);
776 if (!pci_has_subordinate(pci_dev))
777 pci_prepare_to_sleep(pci_dev);
778 }
779
780 pci_pm_set_unknown_state(pci_dev);
781
782
783
784
785
786
787
788
789
790
791 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
792 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
793
794Fixup:
795 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
796
797 return 0;
798}
799
800static int pci_pm_resume_noirq(struct device *dev)
801{
802 struct pci_dev *pci_dev = to_pci_dev(dev);
803 struct device_driver *drv = dev->driver;
804 int error = 0;
805
806 pci_pm_default_resume_early(pci_dev);
807
808 if (pci_has_legacy_pm_support(pci_dev))
809 return pci_legacy_resume_early(dev);
810
811 if (drv && drv->pm && drv->pm->resume_noirq)
812 error = drv->pm->resume_noirq(dev);
813
814 return error;
815}
816
817static int pci_pm_resume(struct device *dev)
818{
819 struct pci_dev *pci_dev = to_pci_dev(dev);
820 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
821 int error = 0;
822
823
824
825
826
827 if (pci_dev->state_saved)
828 pci_restore_standard_config(pci_dev);
829
830 if (pci_has_legacy_pm_support(pci_dev))
831 return pci_legacy_resume(dev);
832
833 pci_pm_default_resume(pci_dev);
834
835 if (pm) {
836 if (pm->resume)
837 error = pm->resume(dev);
838 } else {
839 pci_pm_reenable_device(pci_dev);
840 }
841
842 return error;
843}
844
845#else
846
847#define pci_pm_suspend NULL
848#define pci_pm_suspend_noirq NULL
849#define pci_pm_resume NULL
850#define pci_pm_resume_noirq NULL
851
852#endif
853
854#ifdef CONFIG_HIBERNATE_CALLBACKS
855
856
857
858
859
860
861struct dev_pm_ops __weak pcibios_pm_ops;
862
863static int pci_pm_freeze(struct device *dev)
864{
865 struct pci_dev *pci_dev = to_pci_dev(dev);
866 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
867
868 if (pci_has_legacy_pm_support(pci_dev))
869 return pci_legacy_suspend(dev, PMSG_FREEZE);
870
871 if (!pm) {
872 pci_pm_default_suspend(pci_dev);
873 return 0;
874 }
875
876
877
878
879
880
881
882 pm_runtime_resume(dev);
883
884 pci_dev->state_saved = false;
885 if (pm->freeze) {
886 int error;
887
888 error = pm->freeze(dev);
889 suspend_report_result(pm->freeze, error);
890 if (error)
891 return error;
892 }
893
894 if (pcibios_pm_ops.freeze)
895 return pcibios_pm_ops.freeze(dev);
896
897 return 0;
898}
899
900static int pci_pm_freeze_noirq(struct device *dev)
901{
902 struct pci_dev *pci_dev = to_pci_dev(dev);
903 struct device_driver *drv = dev->driver;
904
905 if (pci_has_legacy_pm_support(pci_dev))
906 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
907
908 if (drv && drv->pm && drv->pm->freeze_noirq) {
909 int error;
910
911 error = drv->pm->freeze_noirq(dev);
912 suspend_report_result(drv->pm->freeze_noirq, error);
913 if (error)
914 return error;
915 }
916
917 if (!pci_dev->state_saved)
918 pci_save_state(pci_dev);
919
920 pci_pm_set_unknown_state(pci_dev);
921
922 if (pcibios_pm_ops.freeze_noirq)
923 return pcibios_pm_ops.freeze_noirq(dev);
924
925 return 0;
926}
927
928static int pci_pm_thaw_noirq(struct device *dev)
929{
930 struct pci_dev *pci_dev = to_pci_dev(dev);
931 struct device_driver *drv = dev->driver;
932 int error = 0;
933
934 if (pcibios_pm_ops.thaw_noirq) {
935 error = pcibios_pm_ops.thaw_noirq(dev);
936 if (error)
937 return error;
938 }
939
940 if (pci_has_legacy_pm_support(pci_dev))
941 return pci_legacy_resume_early(dev);
942
943 pci_update_current_state(pci_dev, PCI_D0);
944
945 if (drv && drv->pm && drv->pm->thaw_noirq)
946 error = drv->pm->thaw_noirq(dev);
947
948 return error;
949}
950
951static int pci_pm_thaw(struct device *dev)
952{
953 struct pci_dev *pci_dev = to_pci_dev(dev);
954 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
955 int error = 0;
956
957 if (pcibios_pm_ops.thaw) {
958 error = pcibios_pm_ops.thaw(dev);
959 if (error)
960 return error;
961 }
962
963 if (pci_has_legacy_pm_support(pci_dev))
964 return pci_legacy_resume(dev);
965
966 if (pm) {
967 if (pm->thaw)
968 error = pm->thaw(dev);
969 } else {
970 pci_pm_reenable_device(pci_dev);
971 }
972
973 pci_dev->state_saved = false;
974
975 return error;
976}
977
978static int pci_pm_poweroff(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_HIBERNATE);
985
986 if (!pm) {
987 pci_pm_default_suspend(pci_dev);
988 goto Fixup;
989 }
990
991
992 pm_runtime_resume(dev);
993
994 pci_dev->state_saved = false;
995 if (pm->poweroff) {
996 int error;
997
998 error = pm->poweroff(dev);
999 suspend_report_result(pm->poweroff, error);
1000 if (error)
1001 return error;
1002 }
1003
1004 Fixup:
1005 pci_fixup_device(pci_fixup_suspend, pci_dev);
1006
1007 if (pcibios_pm_ops.poweroff)
1008 return pcibios_pm_ops.poweroff(dev);
1009
1010 return 0;
1011}
1012
1013static int pci_pm_poweroff_noirq(struct device *dev)
1014{
1015 struct pci_dev *pci_dev = to_pci_dev(dev);
1016 struct device_driver *drv = dev->driver;
1017
1018 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1019 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1020
1021 if (!drv || !drv->pm) {
1022 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1023 return 0;
1024 }
1025
1026 if (drv->pm->poweroff_noirq) {
1027 int error;
1028
1029 error = drv->pm->poweroff_noirq(dev);
1030 suspend_report_result(drv->pm->poweroff_noirq, error);
1031 if (error)
1032 return error;
1033 }
1034
1035 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1036 pci_prepare_to_sleep(pci_dev);
1037
1038
1039
1040
1041
1042 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1043 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1044
1045 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1046
1047 if (pcibios_pm_ops.poweroff_noirq)
1048 return pcibios_pm_ops.poweroff_noirq(dev);
1049
1050 return 0;
1051}
1052
1053static int pci_pm_restore_noirq(struct device *dev)
1054{
1055 struct pci_dev *pci_dev = to_pci_dev(dev);
1056 struct device_driver *drv = dev->driver;
1057 int error = 0;
1058
1059 if (pcibios_pm_ops.restore_noirq) {
1060 error = pcibios_pm_ops.restore_noirq(dev);
1061 if (error)
1062 return error;
1063 }
1064
1065 pci_pm_default_resume_early(pci_dev);
1066
1067 if (pci_has_legacy_pm_support(pci_dev))
1068 return pci_legacy_resume_early(dev);
1069
1070 if (drv && drv->pm && drv->pm->restore_noirq)
1071 error = drv->pm->restore_noirq(dev);
1072
1073 return error;
1074}
1075
1076static int pci_pm_restore(struct device *dev)
1077{
1078 struct pci_dev *pci_dev = to_pci_dev(dev);
1079 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1080 int error = 0;
1081
1082 if (pcibios_pm_ops.restore) {
1083 error = pcibios_pm_ops.restore(dev);
1084 if (error)
1085 return error;
1086 }
1087
1088
1089
1090
1091
1092 if (pci_dev->state_saved)
1093 pci_restore_standard_config(pci_dev);
1094
1095 if (pci_has_legacy_pm_support(pci_dev))
1096 return pci_legacy_resume(dev);
1097
1098 pci_pm_default_resume(pci_dev);
1099
1100 if (pm) {
1101 if (pm->restore)
1102 error = pm->restore(dev);
1103 } else {
1104 pci_pm_reenable_device(pci_dev);
1105 }
1106
1107 return error;
1108}
1109
1110#else
1111
1112#define pci_pm_freeze NULL
1113#define pci_pm_freeze_noirq NULL
1114#define pci_pm_thaw NULL
1115#define pci_pm_thaw_noirq NULL
1116#define pci_pm_poweroff NULL
1117#define pci_pm_poweroff_noirq NULL
1118#define pci_pm_restore NULL
1119#define pci_pm_restore_noirq NULL
1120
1121#endif
1122
1123#ifdef CONFIG_PM
1124
1125static int pci_pm_runtime_suspend(struct device *dev)
1126{
1127 struct pci_dev *pci_dev = to_pci_dev(dev);
1128 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1129 pci_power_t prev = pci_dev->current_state;
1130 int error;
1131
1132
1133
1134
1135
1136 if (!pci_dev->driver)
1137 return 0;
1138
1139 if (!pm || !pm->runtime_suspend)
1140 return -ENOSYS;
1141
1142 pci_dev->state_saved = false;
1143 pci_dev->no_d3cold = false;
1144 error = pm->runtime_suspend(dev);
1145 suspend_report_result(pm->runtime_suspend, error);
1146 if (error)
1147 return error;
1148 if (!pci_dev->d3cold_allowed)
1149 pci_dev->no_d3cold = true;
1150
1151 pci_fixup_device(pci_fixup_suspend, pci_dev);
1152
1153 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1154 && pci_dev->current_state != PCI_UNKNOWN) {
1155 WARN_ONCE(pci_dev->current_state != prev,
1156 "PCI PM: State of device not saved by %pF\n",
1157 pm->runtime_suspend);
1158 return 0;
1159 }
1160
1161 if (!pci_dev->state_saved) {
1162 pci_save_state(pci_dev);
1163 pci_finish_runtime_suspend(pci_dev);
1164 }
1165
1166 return 0;
1167}
1168
1169static int pci_pm_runtime_resume(struct device *dev)
1170{
1171 int rc;
1172 struct pci_dev *pci_dev = to_pci_dev(dev);
1173 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1174
1175
1176
1177
1178
1179 if (!pci_dev->driver)
1180 return 0;
1181
1182 if (!pm || !pm->runtime_resume)
1183 return -ENOSYS;
1184
1185 pci_restore_standard_config(pci_dev);
1186 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1187 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1188 pci_fixup_device(pci_fixup_resume, pci_dev);
1189
1190 rc = pm->runtime_resume(dev);
1191
1192 pci_dev->runtime_d3cold = false;
1193
1194 return rc;
1195}
1196
1197static int pci_pm_runtime_idle(struct device *dev)
1198{
1199 struct pci_dev *pci_dev = to_pci_dev(dev);
1200 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1201 int ret = 0;
1202
1203
1204
1205
1206
1207 if (!pci_dev->driver)
1208 return 0;
1209
1210 if (!pm)
1211 return -ENOSYS;
1212
1213 if (pm->runtime_idle)
1214 ret = pm->runtime_idle(dev);
1215
1216 return ret;
1217}
1218
1219static const struct dev_pm_ops pci_dev_pm_ops = {
1220 .prepare = pci_pm_prepare,
1221 .suspend = pci_pm_suspend,
1222 .resume = pci_pm_resume,
1223 .freeze = pci_pm_freeze,
1224 .thaw = pci_pm_thaw,
1225 .poweroff = pci_pm_poweroff,
1226 .restore = pci_pm_restore,
1227 .suspend_noirq = pci_pm_suspend_noirq,
1228 .resume_noirq = pci_pm_resume_noirq,
1229 .freeze_noirq = pci_pm_freeze_noirq,
1230 .thaw_noirq = pci_pm_thaw_noirq,
1231 .poweroff_noirq = pci_pm_poweroff_noirq,
1232 .restore_noirq = pci_pm_restore_noirq,
1233 .runtime_suspend = pci_pm_runtime_suspend,
1234 .runtime_resume = pci_pm_runtime_resume,
1235 .runtime_idle = pci_pm_runtime_idle,
1236};
1237
1238#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1239
1240#else
1241
1242#define pci_pm_runtime_suspend NULL
1243#define pci_pm_runtime_resume NULL
1244#define pci_pm_runtime_idle NULL
1245
1246#define PCI_PM_OPS_PTR NULL
1247
1248#endif
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1262 const char *mod_name)
1263{
1264
1265 drv->driver.name = drv->name;
1266 drv->driver.bus = &pci_bus_type;
1267 drv->driver.owner = owner;
1268 drv->driver.mod_name = mod_name;
1269
1270 spin_lock_init(&drv->dynids.lock);
1271 INIT_LIST_HEAD(&drv->dynids.list);
1272
1273
1274 return driver_register(&drv->driver);
1275}
1276EXPORT_SYMBOL(__pci_register_driver);
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288void pci_unregister_driver(struct pci_driver *drv)
1289{
1290 driver_unregister(&drv->driver);
1291 pci_free_dynids(drv);
1292}
1293EXPORT_SYMBOL(pci_unregister_driver);
1294
1295static struct pci_driver pci_compat_driver = {
1296 .name = "compat"
1297};
1298
1299
1300
1301
1302
1303
1304
1305
1306struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1307{
1308 if (dev->driver)
1309 return dev->driver;
1310 else {
1311 int i;
1312 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1313 if (dev->resource[i].flags & IORESOURCE_BUSY)
1314 return &pci_compat_driver;
1315 }
1316 return NULL;
1317}
1318EXPORT_SYMBOL(pci_dev_driver);
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329static int pci_bus_match(struct device *dev, struct device_driver *drv)
1330{
1331 struct pci_dev *pci_dev = to_pci_dev(dev);
1332 struct pci_driver *pci_drv;
1333 const struct pci_device_id *found_id;
1334
1335 if (!pci_dev->match_driver)
1336 return 0;
1337
1338 pci_drv = to_pci_driver(drv);
1339 found_id = pci_match_device(pci_drv, pci_dev);
1340 if (found_id)
1341 return 1;
1342
1343 return 0;
1344}
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358struct pci_dev *pci_dev_get(struct pci_dev *dev)
1359{
1360 if (dev)
1361 get_device(&dev->dev);
1362 return dev;
1363}
1364EXPORT_SYMBOL(pci_dev_get);
1365
1366
1367
1368
1369
1370
1371
1372
1373void pci_dev_put(struct pci_dev *dev)
1374{
1375 if (dev)
1376 put_device(&dev->dev);
1377}
1378EXPORT_SYMBOL(pci_dev_put);
1379
1380static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1381{
1382 struct pci_dev *pdev;
1383
1384 if (!dev)
1385 return -ENODEV;
1386
1387 pdev = to_pci_dev(dev);
1388
1389 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1390 return -ENOMEM;
1391
1392 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1393 return -ENOMEM;
1394
1395 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1396 pdev->subsystem_device))
1397 return -ENOMEM;
1398
1399 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1400 return -ENOMEM;
1401
1402 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1403 pdev->vendor, pdev->device,
1404 pdev->subsystem_vendor, pdev->subsystem_device,
1405 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1406 (u8)(pdev->class)))
1407 return -ENOMEM;
1408
1409 return 0;
1410}
1411
1412struct bus_type pci_bus_type = {
1413 .name = "pci",
1414 .match = pci_bus_match,
1415 .uevent = pci_uevent,
1416 .probe = pci_device_probe,
1417 .remove = pci_device_remove,
1418 .shutdown = pci_device_shutdown,
1419 .dev_groups = pci_dev_groups,
1420 .bus_groups = pci_bus_groups,
1421 .drv_groups = pci_drv_groups,
1422 .pm = PCI_PM_OPS_PTR,
1423};
1424EXPORT_SYMBOL(pci_bus_type);
1425
1426static int __init pci_driver_init(void)
1427{
1428 return bus_register(&pci_bus_type);
1429}
1430postcore_initcall(pci_driver_init);
1431