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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
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48
49
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 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
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_WO(new_id);
158
159
160
161
162
163
164
165
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
212
213
214
215
216
217
218
219
220
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
245
246
247
248
249
250
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
259 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
260 return NULL;
261
262
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
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
298
299
300
301
302
303
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
317
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
342
343
344
345 node = dev_to_node(&dev->dev);
346 dev->is_probed = 1;
347
348 cpu_hotplug_disable();
349
350
351
352
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
373
374
375
376
377
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
458 pm_runtime_put_sync(dev);
459
460
461
462
463
464 if (pci_dev->current_state == PCI_D0)
465 pci_dev->current_state = PCI_UNKNOWN;
466
467
468
469
470
471
472
473
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
492
493
494
495
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
504
505
506
507
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
544
545
546static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
547{
548
549
550
551
552 if (pci_dev->current_state == PCI_D0)
553 pci_dev->current_state = PCI_UNKNOWN;
554}
555
556
557
558
559
560static int pci_pm_reenable_device(struct pci_dev *pci_dev)
561{
562 int retval;
563
564
565 retval = pci_reenable_device(pci_dev);
566
567
568
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
629
630static void pci_pm_default_suspend(struct pci_dev *pci_dev)
631{
632
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
644
645
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
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
673
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
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
693
694
695
696
697
698 if (pci_dev->current_state < pre_sleep_state)
699 pm_request_resume(dev);
700 }
701}
702
703#else
704
705#define pci_pm_prepare NULL
706#define pci_pm_complete NULL
707
708#endif
709
710#ifdef CONFIG_SUSPEND
711static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
712{
713
714
715
716
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
741
742
743
744
745
746
747
748
749
750
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
827
828
829
830
831
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
848
849
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
864
865
866
867
868
869
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
879
880
881
882
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
902
903
904
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
939
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
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
969
970#ifdef CONFIG_HIBERNATE_CALLBACKS
971
972
973
974
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
993
994
995
996
997
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
1056
1057
1058
1059
1060
1061
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
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
1170
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
1214
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
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
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
1259
1260
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
1272
1273
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
1314
1315
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
1343
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
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
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1404 const char *mod_name)
1405{
1406
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
1417 return driver_register(&drv->driver);
1418}
1419EXPORT_SYMBOL(__pci_register_driver);
1420
1421
1422
1423
1424
1425
1426
1427
1428
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
1444
1445
1446
1447
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
1465
1466
1467
1468
1469
1470
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
1491
1492
1493
1494
1495
1496
1497
1498
1499
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
1511
1512
1513
1514
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
1558
1559
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
1598
1599
1600
1601
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);
1685