1
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6
7#include <linux/pci.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/device.h>
11#include <linux/mempolicy.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <linux/sched.h>
15#include <linux/sched/isolation.h>
16#include <linux/cpu.h>
17#include <linux/pm_runtime.h>
18#include <linux/suspend.h>
19#include <linux/kexec.h>
20#include <linux/of_device.h>
21#include <linux/acpi.h>
22#include <linux/dma-map-ops.h>
23#include <linux/iommu.h>
24#include "pci.h"
25#include "pcie/portdrv.h"
26
27struct pci_dynid {
28 struct list_head node;
29 struct pci_device_id id;
30};
31
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50
51
52
53int pci_add_dynid(struct pci_driver *drv,
54 unsigned int vendor, unsigned int device,
55 unsigned int subvendor, unsigned int subdevice,
56 unsigned int class, unsigned int class_mask,
57 unsigned long driver_data)
58{
59 struct pci_dynid *dynid;
60
61 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
62 if (!dynid)
63 return -ENOMEM;
64
65 dynid->id.vendor = vendor;
66 dynid->id.device = device;
67 dynid->id.subvendor = subvendor;
68 dynid->id.subdevice = subdevice;
69 dynid->id.class = class;
70 dynid->id.class_mask = class_mask;
71 dynid->id.driver_data = driver_data;
72
73 spin_lock(&drv->dynids.lock);
74 list_add_tail(&dynid->node, &drv->dynids.list);
75 spin_unlock(&drv->dynids.lock);
76
77 return driver_attach(&drv->driver);
78}
79EXPORT_SYMBOL_GPL(pci_add_dynid);
80
81static void pci_free_dynids(struct pci_driver *drv)
82{
83 struct pci_dynid *dynid, *n;
84
85 spin_lock(&drv->dynids.lock);
86 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 list_del(&dynid->node);
88 kfree(dynid);
89 }
90 spin_unlock(&drv->dynids.lock);
91}
92
93
94
95
96
97
98
99
100
101
102
103
104
105const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
106 struct pci_dev *dev)
107{
108 if (ids) {
109 while (ids->vendor || ids->subvendor || ids->class_mask) {
110 if (pci_match_one_device(ids, dev))
111 return ids;
112 ids++;
113 }
114 }
115 return NULL;
116}
117EXPORT_SYMBOL(pci_match_id);
118
119static const struct pci_device_id pci_device_id_any = {
120 .vendor = PCI_ANY_ID,
121 .device = PCI_ANY_ID,
122 .subvendor = PCI_ANY_ID,
123 .subdevice = PCI_ANY_ID,
124};
125
126
127
128
129
130
131
132
133
134
135
136static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
137 struct pci_dev *dev)
138{
139 struct pci_dynid *dynid;
140 const struct pci_device_id *found_id = NULL, *ids;
141
142
143 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
144 return NULL;
145
146
147 spin_lock(&drv->dynids.lock);
148 list_for_each_entry(dynid, &drv->dynids.list, node) {
149 if (pci_match_one_device(&dynid->id, dev)) {
150 found_id = &dynid->id;
151 break;
152 }
153 }
154 spin_unlock(&drv->dynids.lock);
155
156 if (found_id)
157 return found_id;
158
159 for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
160 ids = found_id + 1) {
161
162
163
164
165
166 if (found_id->override_only) {
167 if (dev->driver_override)
168 return found_id;
169 } else {
170 return found_id;
171 }
172 }
173
174
175 if (dev->driver_override)
176 return &pci_device_id_any;
177 return NULL;
178}
179
180
181
182
183
184
185
186
187
188static ssize_t new_id_store(struct device_driver *driver, const char *buf,
189 size_t count)
190{
191 struct pci_driver *pdrv = to_pci_driver(driver);
192 const struct pci_device_id *ids = pdrv->id_table;
193 u32 vendor, device, subvendor = PCI_ANY_ID,
194 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
195 unsigned long driver_data = 0;
196 int fields = 0;
197 int retval = 0;
198
199 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
200 &vendor, &device, &subvendor, &subdevice,
201 &class, &class_mask, &driver_data);
202 if (fields < 2)
203 return -EINVAL;
204
205 if (fields != 7) {
206 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
207 if (!pdev)
208 return -ENOMEM;
209
210 pdev->vendor = vendor;
211 pdev->device = device;
212 pdev->subsystem_vendor = subvendor;
213 pdev->subsystem_device = subdevice;
214 pdev->class = class;
215
216 if (pci_match_device(pdrv, pdev))
217 retval = -EEXIST;
218
219 kfree(pdev);
220
221 if (retval)
222 return retval;
223 }
224
225
226
227 if (ids) {
228 retval = -EINVAL;
229 while (ids->vendor || ids->subvendor || ids->class_mask) {
230 if (driver_data == ids->driver_data) {
231 retval = 0;
232 break;
233 }
234 ids++;
235 }
236 if (retval)
237 return retval;
238 }
239
240 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
241 class, class_mask, driver_data);
242 if (retval)
243 return retval;
244 return count;
245}
246static DRIVER_ATTR_WO(new_id);
247
248
249
250
251
252
253
254
255
256static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
257 size_t count)
258{
259 struct pci_dynid *dynid, *n;
260 struct pci_driver *pdrv = to_pci_driver(driver);
261 u32 vendor, device, subvendor = PCI_ANY_ID,
262 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
263 int fields = 0;
264 size_t retval = -ENODEV;
265
266 fields = sscanf(buf, "%x %x %x %x %x %x",
267 &vendor, &device, &subvendor, &subdevice,
268 &class, &class_mask);
269 if (fields < 2)
270 return -EINVAL;
271
272 spin_lock(&pdrv->dynids.lock);
273 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
274 struct pci_device_id *id = &dynid->id;
275 if ((id->vendor == vendor) &&
276 (id->device == device) &&
277 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
278 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
279 !((id->class ^ class) & class_mask)) {
280 list_del(&dynid->node);
281 kfree(dynid);
282 retval = count;
283 break;
284 }
285 }
286 spin_unlock(&pdrv->dynids.lock);
287
288 return retval;
289}
290static DRIVER_ATTR_WO(remove_id);
291
292static struct attribute *pci_drv_attrs[] = {
293 &driver_attr_new_id.attr,
294 &driver_attr_remove_id.attr,
295 NULL,
296};
297ATTRIBUTE_GROUPS(pci_drv);
298
299struct drv_dev_and_id {
300 struct pci_driver *drv;
301 struct pci_dev *dev;
302 const struct pci_device_id *id;
303};
304
305static long local_pci_probe(void *_ddi)
306{
307 struct drv_dev_and_id *ddi = _ddi;
308 struct pci_dev *pci_dev = ddi->dev;
309 struct pci_driver *pci_drv = ddi->drv;
310 struct device *dev = &pci_dev->dev;
311 int rc;
312
313
314
315
316
317
318
319
320
321
322 pm_runtime_get_sync(dev);
323 pci_dev->driver = pci_drv;
324 rc = pci_drv->probe(pci_dev, ddi->id);
325 if (!rc)
326 return rc;
327 if (rc < 0) {
328 pci_dev->driver = NULL;
329 pm_runtime_put_sync(dev);
330 return rc;
331 }
332
333
334
335
336 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
337 rc);
338 return 0;
339}
340
341static bool pci_physfn_is_probed(struct pci_dev *dev)
342{
343#ifdef CONFIG_PCI_IOV
344 return dev->is_virtfn && dev->physfn->is_probed;
345#else
346 return false;
347#endif
348}
349
350static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
351 const struct pci_device_id *id)
352{
353 int error, node, cpu;
354 struct drv_dev_and_id ddi = { drv, dev, id };
355
356
357
358
359
360
361 node = dev_to_node(&dev->dev);
362 dev->is_probed = 1;
363
364 cpu_hotplug_disable();
365
366
367
368
369
370 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
371 pci_physfn_is_probed(dev)) {
372 cpu = nr_cpu_ids;
373 } else {
374 cpumask_var_t wq_domain_mask;
375
376 if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
377 error = -ENOMEM;
378 goto out;
379 }
380 cpumask_and(wq_domain_mask,
381 housekeeping_cpumask(HK_TYPE_WQ),
382 housekeeping_cpumask(HK_TYPE_DOMAIN));
383
384 cpu = cpumask_any_and(cpumask_of_node(node),
385 wq_domain_mask);
386 free_cpumask_var(wq_domain_mask);
387 }
388
389 if (cpu < nr_cpu_ids)
390 error = work_on_cpu(cpu, local_pci_probe, &ddi);
391 else
392 error = local_pci_probe(&ddi);
393out:
394 dev->is_probed = 0;
395 cpu_hotplug_enable();
396 return error;
397}
398
399
400
401
402
403
404
405
406
407static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
408{
409 const struct pci_device_id *id;
410 int error = 0;
411
412 if (drv->probe) {
413 error = -ENODEV;
414
415 id = pci_match_device(drv, pci_dev);
416 if (id)
417 error = pci_call_probe(drv, pci_dev, id);
418 }
419 return error;
420}
421
422int __weak pcibios_alloc_irq(struct pci_dev *dev)
423{
424 return 0;
425}
426
427void __weak pcibios_free_irq(struct pci_dev *dev)
428{
429}
430
431#ifdef CONFIG_PCI_IOV
432static inline bool pci_device_can_probe(struct pci_dev *pdev)
433{
434 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
435 pdev->driver_override);
436}
437#else
438static inline bool pci_device_can_probe(struct pci_dev *pdev)
439{
440 return true;
441}
442#endif
443
444static int pci_device_probe(struct device *dev)
445{
446 int error;
447 struct pci_dev *pci_dev = to_pci_dev(dev);
448 struct pci_driver *drv = to_pci_driver(dev->driver);
449
450 if (!pci_device_can_probe(pci_dev))
451 return -ENODEV;
452
453 pci_assign_irq(pci_dev);
454
455 error = pcibios_alloc_irq(pci_dev);
456 if (error < 0)
457 return error;
458
459 pci_dev_get(pci_dev);
460 error = __pci_device_probe(drv, pci_dev);
461 if (error) {
462 pcibios_free_irq(pci_dev);
463 pci_dev_put(pci_dev);
464 }
465
466 return error;
467}
468
469static void pci_device_remove(struct device *dev)
470{
471 struct pci_dev *pci_dev = to_pci_dev(dev);
472 struct pci_driver *drv = pci_dev->driver;
473
474 if (drv->remove) {
475 pm_runtime_get_sync(dev);
476 drv->remove(pci_dev);
477 pm_runtime_put_noidle(dev);
478 }
479 pcibios_free_irq(pci_dev);
480 pci_dev->driver = NULL;
481 pci_iov_remove(pci_dev);
482
483
484 pm_runtime_put_sync(dev);
485
486
487
488
489
490 if (pci_dev->current_state == PCI_D0)
491 pci_dev->current_state = PCI_UNKNOWN;
492
493
494
495
496
497
498
499
500
501
502 pci_dev_put(pci_dev);
503}
504
505static void pci_device_shutdown(struct device *dev)
506{
507 struct pci_dev *pci_dev = to_pci_dev(dev);
508 struct pci_driver *drv = pci_dev->driver;
509
510 pm_runtime_resume(dev);
511
512 if (drv && drv->shutdown)
513 drv->shutdown(pci_dev);
514
515
516
517
518
519
520
521
522 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
523 pci_clear_master(pci_dev);
524}
525
526#ifdef CONFIG_PM_SLEEP
527
528
529
530
531
532
533
534static int pci_restore_standard_config(struct pci_dev *pci_dev)
535{
536 pci_update_current_state(pci_dev, PCI_UNKNOWN);
537
538 if (pci_dev->current_state != PCI_D0) {
539 int error = pci_set_power_state(pci_dev, PCI_D0);
540 if (error)
541 return error;
542 }
543
544 pci_restore_state(pci_dev);
545 pci_pme_restore(pci_dev);
546 return 0;
547}
548#endif
549
550#ifdef CONFIG_PM
551
552
553
554static void pci_pm_default_resume(struct pci_dev *pci_dev)
555{
556 pci_fixup_device(pci_fixup_resume, pci_dev);
557 pci_enable_wake(pci_dev, PCI_D0, false);
558}
559
560static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev)
561{
562 pci_power_up(pci_dev);
563 pci_update_current_state(pci_dev, PCI_D0);
564}
565
566static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
567{
568 pci_pm_power_up_and_verify_state(pci_dev);
569 pci_restore_state(pci_dev);
570 pci_pme_restore(pci_dev);
571}
572
573static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev)
574{
575 pci_bridge_wait_for_secondary_bus(pci_dev);
576
577
578
579
580
581 pci_resume_bus(pci_dev->subordinate);
582}
583
584#endif
585
586#ifdef CONFIG_PM_SLEEP
587
588
589
590
591
592static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
593{
594
595
596
597
598 if (pci_dev->current_state == PCI_D0)
599 pci_dev->current_state = PCI_UNKNOWN;
600}
601
602
603
604
605
606static int pci_pm_reenable_device(struct pci_dev *pci_dev)
607{
608 int retval;
609
610
611 retval = pci_reenable_device(pci_dev);
612
613
614
615
616 if (pci_dev->is_busmaster)
617 pci_set_master(pci_dev);
618
619 return retval;
620}
621
622static int pci_legacy_suspend(struct device *dev, pm_message_t state)
623{
624 struct pci_dev *pci_dev = to_pci_dev(dev);
625 struct pci_driver *drv = pci_dev->driver;
626
627 if (drv && drv->suspend) {
628 pci_power_t prev = pci_dev->current_state;
629 int error;
630
631 error = drv->suspend(pci_dev, state);
632 suspend_report_result(dev, drv->suspend, error);
633 if (error)
634 return error;
635
636 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
637 && pci_dev->current_state != PCI_UNKNOWN) {
638 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
639 "PCI PM: Device state not saved by %pS\n",
640 drv->suspend);
641 }
642 }
643
644 pci_fixup_device(pci_fixup_suspend, pci_dev);
645
646 return 0;
647}
648
649static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
650{
651 struct pci_dev *pci_dev = to_pci_dev(dev);
652
653 if (!pci_dev->state_saved)
654 pci_save_state(pci_dev);
655
656 pci_pm_set_unknown_state(pci_dev);
657
658 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
659
660 return 0;
661}
662
663static int pci_legacy_resume(struct device *dev)
664{
665 struct pci_dev *pci_dev = to_pci_dev(dev);
666 struct pci_driver *drv = pci_dev->driver;
667
668 pci_fixup_device(pci_fixup_resume, pci_dev);
669
670 return drv && drv->resume ?
671 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
672}
673
674
675
676static void pci_pm_default_suspend(struct pci_dev *pci_dev)
677{
678
679 if (!pci_has_subordinate(pci_dev))
680 pci_disable_enabled_device(pci_dev);
681}
682
683static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
684{
685 struct pci_driver *drv = pci_dev->driver;
686 bool ret = drv && (drv->suspend || drv->resume);
687
688
689
690
691
692
693 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
694 pci_dev->vendor, pci_dev->device);
695
696 return ret;
697}
698
699
700
701static int pci_pm_prepare(struct device *dev)
702{
703 struct pci_dev *pci_dev = to_pci_dev(dev);
704 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
705
706 if (pm && pm->prepare) {
707 int error = pm->prepare(dev);
708 if (error < 0)
709 return error;
710
711 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
712 return 0;
713 }
714 if (pci_dev_need_resume(pci_dev))
715 return 0;
716
717
718
719
720
721 pci_dev_adjust_pme(pci_dev);
722 return 1;
723}
724
725static void pci_pm_complete(struct device *dev)
726{
727 struct pci_dev *pci_dev = to_pci_dev(dev);
728
729 pci_dev_complete_resume(pci_dev);
730 pm_generic_complete(dev);
731
732
733 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
734 pci_power_t pre_sleep_state = pci_dev->current_state;
735
736 pci_refresh_power_state(pci_dev);
737
738
739
740
741
742
743
744 if (pci_dev->current_state < pre_sleep_state)
745 pm_request_resume(dev);
746 }
747}
748
749#else
750
751#define pci_pm_prepare NULL
752#define pci_pm_complete NULL
753
754#endif
755
756#ifdef CONFIG_SUSPEND
757static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
758{
759
760
761
762
763
764 if (pci_is_pcie(pci_dev) &&
765 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
766 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
767 pcie_clear_root_pme_status(pci_dev);
768}
769
770static int pci_pm_suspend(struct device *dev)
771{
772 struct pci_dev *pci_dev = to_pci_dev(dev);
773 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
774
775 pci_dev->skip_bus_pm = false;
776
777 if (pci_has_legacy_pm_support(pci_dev))
778 return pci_legacy_suspend(dev, PMSG_SUSPEND);
779
780 if (!pm) {
781 pci_pm_default_suspend(pci_dev);
782 return 0;
783 }
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
799 pci_dev_need_resume(pci_dev)) {
800 pm_runtime_resume(dev);
801 pci_dev->state_saved = false;
802 } else {
803 pci_dev_adjust_pme(pci_dev);
804 }
805
806 if (pm->suspend) {
807 pci_power_t prev = pci_dev->current_state;
808 int error;
809
810 error = pm->suspend(dev);
811 suspend_report_result(dev, pm->suspend, 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);
820 }
821 }
822
823 return 0;
824}
825
826static int pci_pm_suspend_late(struct device *dev)
827{
828 if (dev_pm_skip_suspend(dev))
829 return 0;
830
831 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
832
833 return pm_generic_suspend_late(dev);
834}
835
836static int pci_pm_suspend_noirq(struct device *dev)
837{
838 struct pci_dev *pci_dev = to_pci_dev(dev);
839 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
840
841 if (dev_pm_skip_suspend(dev))
842 return 0;
843
844 if (pci_has_legacy_pm_support(pci_dev))
845 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
846
847 if (!pm) {
848 pci_save_state(pci_dev);
849 goto Fixup;
850 }
851
852 if (pm->suspend_noirq) {
853 pci_power_t prev = pci_dev->current_state;
854 int error;
855
856 error = pm->suspend_noirq(dev);
857 suspend_report_result(dev, pm->suspend_noirq, error);
858 if (error)
859 return error;
860
861 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
862 && pci_dev->current_state != PCI_UNKNOWN) {
863 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
864 "PCI PM: State of device not saved by %pS\n",
865 pm->suspend_noirq);
866 goto Fixup;
867 }
868 }
869
870 if (pci_dev->skip_bus_pm) {
871
872
873
874
875
876
877
878
879 if (!pci_dev->state_saved)
880 pci_save_state(pci_dev);
881 } else if (!pci_dev->state_saved) {
882 pci_save_state(pci_dev);
883 if (pci_power_manageable(pci_dev))
884 pci_prepare_to_sleep(pci_dev);
885 }
886
887 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
888 pci_power_name(pci_dev->current_state));
889
890 if (pci_dev->current_state == PCI_D0) {
891 pci_dev->skip_bus_pm = true;
892
893
894
895
896
897 if (pci_dev->bus->self)
898 pci_dev->bus->self->skip_bus_pm = true;
899 }
900
901 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
902 pci_dbg(pci_dev, "PCI PM: Skipped\n");
903 goto Fixup;
904 }
905
906 pci_pm_set_unknown_state(pci_dev);
907
908
909
910
911
912
913
914
915
916
917 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
918 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
919
920Fixup:
921 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
922
923
924
925
926
927
928
929
930 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
931 dev->power.may_skip_resume = false;
932
933 return 0;
934}
935
936static int pci_pm_resume_noirq(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 pci_power_t prev_state = pci_dev->current_state;
941 bool skip_bus_pm = pci_dev->skip_bus_pm;
942
943 if (dev_pm_skip_resume(dev))
944 return 0;
945
946
947
948
949
950
951
952 if (!(skip_bus_pm && pm_suspend_no_platform()))
953 pci_pm_default_resume_early(pci_dev);
954
955 pci_fixup_device(pci_fixup_resume_early, pci_dev);
956 pcie_pme_root_status_cleanup(pci_dev);
957
958 if (!skip_bus_pm && prev_state == PCI_D3cold)
959 pci_pm_bridge_power_up_actions(pci_dev);
960
961 if (pci_has_legacy_pm_support(pci_dev))
962 return 0;
963
964 if (pm && pm->resume_noirq)
965 return pm->resume_noirq(dev);
966
967 return 0;
968}
969
970static int pci_pm_resume_early(struct device *dev)
971{
972 if (dev_pm_skip_resume(dev))
973 return 0;
974
975 return pm_generic_resume_early(dev);
976}
977
978static int pci_pm_resume(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
984
985
986
987 if (pci_dev->state_saved)
988 pci_restore_standard_config(pci_dev);
989
990 if (pci_has_legacy_pm_support(pci_dev))
991 return pci_legacy_resume(dev);
992
993 pci_pm_default_resume(pci_dev);
994
995 if (pm) {
996 if (pm->resume)
997 return pm->resume(dev);
998 } else {
999 pci_pm_reenable_device(pci_dev);
1000 }
1001
1002 return 0;
1003}
1004
1005#else
1006
1007#define pci_pm_suspend NULL
1008#define pci_pm_suspend_late NULL
1009#define pci_pm_suspend_noirq NULL
1010#define pci_pm_resume NULL
1011#define pci_pm_resume_early NULL
1012#define pci_pm_resume_noirq NULL
1013
1014#endif
1015
1016#ifdef CONFIG_HIBERNATE_CALLBACKS
1017
1018static int pci_pm_freeze(struct device *dev)
1019{
1020 struct pci_dev *pci_dev = to_pci_dev(dev);
1021 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1022
1023 if (pci_has_legacy_pm_support(pci_dev))
1024 return pci_legacy_suspend(dev, PMSG_FREEZE);
1025
1026 if (!pm) {
1027 pci_pm_default_suspend(pci_dev);
1028 return 0;
1029 }
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039 pm_runtime_resume(dev);
1040 pci_dev->state_saved = false;
1041
1042 if (pm->freeze) {
1043 int error;
1044
1045 error = pm->freeze(dev);
1046 suspend_report_result(dev, pm->freeze, error);
1047 if (error)
1048 return error;
1049 }
1050
1051 return 0;
1052}
1053
1054static int pci_pm_freeze_noirq(struct device *dev)
1055{
1056 struct pci_dev *pci_dev = to_pci_dev(dev);
1057 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1058
1059 if (pci_has_legacy_pm_support(pci_dev))
1060 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1061
1062 if (pm && pm->freeze_noirq) {
1063 int error;
1064
1065 error = pm->freeze_noirq(dev);
1066 suspend_report_result(dev, pm->freeze_noirq, error);
1067 if (error)
1068 return error;
1069 }
1070
1071 if (!pci_dev->state_saved)
1072 pci_save_state(pci_dev);
1073
1074 pci_pm_set_unknown_state(pci_dev);
1075
1076 return 0;
1077}
1078
1079static int pci_pm_thaw_noirq(struct device *dev)
1080{
1081 struct pci_dev *pci_dev = to_pci_dev(dev);
1082 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093 pci_pm_power_up_and_verify_state(pci_dev);
1094 pci_restore_state(pci_dev);
1095
1096 if (pci_has_legacy_pm_support(pci_dev))
1097 return 0;
1098
1099 if (pm && pm->thaw_noirq)
1100 return pm->thaw_noirq(dev);
1101
1102 return 0;
1103}
1104
1105static int pci_pm_thaw(struct device *dev)
1106{
1107 struct pci_dev *pci_dev = to_pci_dev(dev);
1108 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1109 int error = 0;
1110
1111 if (pci_has_legacy_pm_support(pci_dev))
1112 return pci_legacy_resume(dev);
1113
1114 if (pm) {
1115 if (pm->thaw)
1116 error = pm->thaw(dev);
1117 } else {
1118 pci_pm_reenable_device(pci_dev);
1119 }
1120
1121 pci_dev->state_saved = false;
1122
1123 return error;
1124}
1125
1126static int pci_pm_poweroff(struct device *dev)
1127{
1128 struct pci_dev *pci_dev = to_pci_dev(dev);
1129 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1130
1131 if (pci_has_legacy_pm_support(pci_dev))
1132 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1133
1134 if (!pm) {
1135 pci_pm_default_suspend(pci_dev);
1136 return 0;
1137 }
1138
1139
1140 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1141 pci_dev_need_resume(pci_dev)) {
1142 pm_runtime_resume(dev);
1143 pci_dev->state_saved = false;
1144 } else {
1145 pci_dev_adjust_pme(pci_dev);
1146 }
1147
1148 if (pm->poweroff) {
1149 int error;
1150
1151 error = pm->poweroff(dev);
1152 suspend_report_result(dev, pm->poweroff, error);
1153 if (error)
1154 return error;
1155 }
1156
1157 return 0;
1158}
1159
1160static int pci_pm_poweroff_late(struct device *dev)
1161{
1162 if (dev_pm_skip_suspend(dev))
1163 return 0;
1164
1165 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1166
1167 return pm_generic_poweroff_late(dev);
1168}
1169
1170static int pci_pm_poweroff_noirq(struct device *dev)
1171{
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 if (dev_pm_skip_suspend(dev))
1176 return 0;
1177
1178 if (pci_has_legacy_pm_support(pci_dev))
1179 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1180
1181 if (!pm) {
1182 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1183 return 0;
1184 }
1185
1186 if (pm->poweroff_noirq) {
1187 int error;
1188
1189 error = pm->poweroff_noirq(dev);
1190 suspend_report_result(dev, pm->poweroff_noirq, error);
1191 if (error)
1192 return error;
1193 }
1194
1195 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1196 pci_prepare_to_sleep(pci_dev);
1197
1198
1199
1200
1201
1202 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1203 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1204
1205 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1206
1207 return 0;
1208}
1209
1210static int pci_pm_restore_noirq(struct device *dev)
1211{
1212 struct pci_dev *pci_dev = to_pci_dev(dev);
1213 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1214
1215 pci_pm_default_resume_early(pci_dev);
1216 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1217
1218 if (pci_has_legacy_pm_support(pci_dev))
1219 return 0;
1220
1221 if (pm && pm->restore_noirq)
1222 return pm->restore_noirq(dev);
1223
1224 return 0;
1225}
1226
1227static int pci_pm_restore(struct device *dev)
1228{
1229 struct pci_dev *pci_dev = to_pci_dev(dev);
1230 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1231
1232
1233
1234
1235
1236 if (pci_dev->state_saved)
1237 pci_restore_standard_config(pci_dev);
1238
1239 if (pci_has_legacy_pm_support(pci_dev))
1240 return pci_legacy_resume(dev);
1241
1242 pci_pm_default_resume(pci_dev);
1243
1244 if (pm) {
1245 if (pm->restore)
1246 return pm->restore(dev);
1247 } else {
1248 pci_pm_reenable_device(pci_dev);
1249 }
1250
1251 return 0;
1252}
1253
1254#else
1255
1256#define pci_pm_freeze NULL
1257#define pci_pm_freeze_noirq NULL
1258#define pci_pm_thaw NULL
1259#define pci_pm_thaw_noirq NULL
1260#define pci_pm_poweroff NULL
1261#define pci_pm_poweroff_late NULL
1262#define pci_pm_poweroff_noirq NULL
1263#define pci_pm_restore NULL
1264#define pci_pm_restore_noirq NULL
1265
1266#endif
1267
1268#ifdef CONFIG_PM
1269
1270static int pci_pm_runtime_suspend(struct device *dev)
1271{
1272 struct pci_dev *pci_dev = to_pci_dev(dev);
1273 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1274 pci_power_t prev = pci_dev->current_state;
1275 int error;
1276
1277
1278
1279
1280
1281
1282 if (!pci_dev->driver) {
1283 pci_save_state(pci_dev);
1284 return 0;
1285 }
1286
1287 pci_dev->state_saved = false;
1288 if (pm && pm->runtime_suspend) {
1289 error = pm->runtime_suspend(dev);
1290
1291
1292
1293
1294
1295 if (error == -EBUSY || error == -EAGAIN) {
1296 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1297 pm->runtime_suspend, error);
1298 return error;
1299 } else if (error) {
1300 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1301 pm->runtime_suspend, error);
1302 return error;
1303 }
1304 }
1305
1306 pci_fixup_device(pci_fixup_suspend, pci_dev);
1307
1308 if (pm && pm->runtime_suspend
1309 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1310 && pci_dev->current_state != PCI_UNKNOWN) {
1311 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1312 "PCI PM: State of device not saved by %pS\n",
1313 pm->runtime_suspend);
1314 return 0;
1315 }
1316
1317 if (!pci_dev->state_saved) {
1318 pci_save_state(pci_dev);
1319 pci_finish_runtime_suspend(pci_dev);
1320 }
1321
1322 return 0;
1323}
1324
1325static int pci_pm_runtime_resume(struct device *dev)
1326{
1327 struct pci_dev *pci_dev = to_pci_dev(dev);
1328 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1329 pci_power_t prev_state = pci_dev->current_state;
1330 int error = 0;
1331
1332
1333
1334
1335
1336
1337 pci_pm_default_resume_early(pci_dev);
1338
1339 if (!pci_dev->driver)
1340 return 0;
1341
1342 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1343 pci_pm_default_resume(pci_dev);
1344
1345 if (prev_state == PCI_D3cold)
1346 pci_pm_bridge_power_up_actions(pci_dev);
1347
1348 if (pm && pm->runtime_resume)
1349 error = pm->runtime_resume(dev);
1350
1351 return error;
1352}
1353
1354static int pci_pm_runtime_idle(struct device *dev)
1355{
1356 struct pci_dev *pci_dev = to_pci_dev(dev);
1357 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1358
1359
1360
1361
1362
1363 if (!pci_dev->driver)
1364 return 0;
1365
1366 if (!pm)
1367 return -ENOSYS;
1368
1369 if (pm->runtime_idle)
1370 return pm->runtime_idle(dev);
1371
1372 return 0;
1373}
1374
1375static const struct dev_pm_ops pci_dev_pm_ops = {
1376 .prepare = pci_pm_prepare,
1377 .complete = pci_pm_complete,
1378 .suspend = pci_pm_suspend,
1379 .suspend_late = pci_pm_suspend_late,
1380 .resume = pci_pm_resume,
1381 .resume_early = pci_pm_resume_early,
1382 .freeze = pci_pm_freeze,
1383 .thaw = pci_pm_thaw,
1384 .poweroff = pci_pm_poweroff,
1385 .poweroff_late = pci_pm_poweroff_late,
1386 .restore = pci_pm_restore,
1387 .suspend_noirq = pci_pm_suspend_noirq,
1388 .resume_noirq = pci_pm_resume_noirq,
1389 .freeze_noirq = pci_pm_freeze_noirq,
1390 .thaw_noirq = pci_pm_thaw_noirq,
1391 .poweroff_noirq = pci_pm_poweroff_noirq,
1392 .restore_noirq = pci_pm_restore_noirq,
1393 .runtime_suspend = pci_pm_runtime_suspend,
1394 .runtime_resume = pci_pm_runtime_resume,
1395 .runtime_idle = pci_pm_runtime_idle,
1396};
1397
1398#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1399
1400#else
1401
1402#define pci_pm_runtime_suspend NULL
1403#define pci_pm_runtime_resume NULL
1404#define pci_pm_runtime_idle NULL
1405
1406#define PCI_PM_OPS_PTR NULL
1407
1408#endif
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1422 const char *mod_name)
1423{
1424
1425 drv->driver.name = drv->name;
1426 drv->driver.bus = &pci_bus_type;
1427 drv->driver.owner = owner;
1428 drv->driver.mod_name = mod_name;
1429 drv->driver.groups = drv->groups;
1430 drv->driver.dev_groups = drv->dev_groups;
1431
1432 spin_lock_init(&drv->dynids.lock);
1433 INIT_LIST_HEAD(&drv->dynids.list);
1434
1435
1436 return driver_register(&drv->driver);
1437}
1438EXPORT_SYMBOL(__pci_register_driver);
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450void pci_unregister_driver(struct pci_driver *drv)
1451{
1452 driver_unregister(&drv->driver);
1453 pci_free_dynids(drv);
1454}
1455EXPORT_SYMBOL(pci_unregister_driver);
1456
1457static struct pci_driver pci_compat_driver = {
1458 .name = "compat"
1459};
1460
1461
1462
1463
1464
1465
1466
1467
1468struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1469{
1470 if (dev->driver)
1471 return dev->driver;
1472 else {
1473 int i;
1474 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1475 if (dev->resource[i].flags & IORESOURCE_BUSY)
1476 return &pci_compat_driver;
1477 }
1478 return NULL;
1479}
1480EXPORT_SYMBOL(pci_dev_driver);
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491static int pci_bus_match(struct device *dev, struct device_driver *drv)
1492{
1493 struct pci_dev *pci_dev = to_pci_dev(dev);
1494 struct pci_driver *pci_drv;
1495 const struct pci_device_id *found_id;
1496
1497 if (!pci_dev->match_driver)
1498 return 0;
1499
1500 pci_drv = to_pci_driver(drv);
1501 found_id = pci_match_device(pci_drv, pci_dev);
1502 if (found_id)
1503 return 1;
1504
1505 return 0;
1506}
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520struct pci_dev *pci_dev_get(struct pci_dev *dev)
1521{
1522 if (dev)
1523 get_device(&dev->dev);
1524 return dev;
1525}
1526EXPORT_SYMBOL(pci_dev_get);
1527
1528
1529
1530
1531
1532
1533
1534
1535void pci_dev_put(struct pci_dev *dev)
1536{
1537 if (dev)
1538 put_device(&dev->dev);
1539}
1540EXPORT_SYMBOL(pci_dev_put);
1541
1542static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1543{
1544 struct pci_dev *pdev;
1545
1546 if (!dev)
1547 return -ENODEV;
1548
1549 pdev = to_pci_dev(dev);
1550
1551 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1552 return -ENOMEM;
1553
1554 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1555 return -ENOMEM;
1556
1557 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1558 pdev->subsystem_device))
1559 return -ENOMEM;
1560
1561 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1562 return -ENOMEM;
1563
1564 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1565 pdev->vendor, pdev->device,
1566 pdev->subsystem_vendor, pdev->subsystem_device,
1567 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1568 (u8)(pdev->class)))
1569 return -ENOMEM;
1570
1571 return 0;
1572}
1573
1574#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1575
1576
1577
1578
1579
1580void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1581{
1582 int idx = 0;
1583 char *envp[3];
1584
1585 switch (err_type) {
1586 case PCI_ERS_RESULT_NONE:
1587 case PCI_ERS_RESULT_CAN_RECOVER:
1588 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1589 envp[idx++] = "DEVICE_ONLINE=0";
1590 break;
1591 case PCI_ERS_RESULT_RECOVERED:
1592 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1593 envp[idx++] = "DEVICE_ONLINE=1";
1594 break;
1595 case PCI_ERS_RESULT_DISCONNECT:
1596 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1597 envp[idx++] = "DEVICE_ONLINE=0";
1598 break;
1599 default:
1600 break;
1601 }
1602
1603 if (idx > 0) {
1604 envp[idx++] = NULL;
1605 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1606 }
1607}
1608#endif
1609
1610static int pci_bus_num_vf(struct device *dev)
1611{
1612 return pci_num_vf(to_pci_dev(dev));
1613}
1614
1615
1616
1617
1618
1619
1620
1621
1622static int pci_dma_configure(struct device *dev)
1623{
1624 struct pci_driver *driver = to_pci_driver(dev->driver);
1625 struct device *bridge;
1626 int ret = 0;
1627
1628 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1629
1630 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1631 bridge->parent->of_node) {
1632 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1633 } else if (has_acpi_companion(bridge)) {
1634 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1635
1636 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1637 }
1638
1639 pci_put_host_bridge_device(bridge);
1640
1641 if (!ret && !driver->driver_managed_dma) {
1642 ret = iommu_device_use_default_domain(dev);
1643 if (ret)
1644 arch_teardown_dma_ops(dev);
1645 }
1646
1647 return ret;
1648}
1649
1650static void pci_dma_cleanup(struct device *dev)
1651{
1652 struct pci_driver *driver = to_pci_driver(dev->driver);
1653
1654 if (!driver->driver_managed_dma)
1655 iommu_device_unuse_default_domain(dev);
1656}
1657
1658struct bus_type pci_bus_type = {
1659 .name = "pci",
1660 .match = pci_bus_match,
1661 .uevent = pci_uevent,
1662 .probe = pci_device_probe,
1663 .remove = pci_device_remove,
1664 .shutdown = pci_device_shutdown,
1665 .dev_groups = pci_dev_groups,
1666 .bus_groups = pci_bus_groups,
1667 .drv_groups = pci_drv_groups,
1668 .pm = PCI_PM_OPS_PTR,
1669 .num_vf = pci_bus_num_vf,
1670 .dma_configure = pci_dma_configure,
1671 .dma_cleanup = pci_dma_cleanup,
1672};
1673EXPORT_SYMBOL(pci_bus_type);
1674
1675#ifdef CONFIG_PCIEPORTBUS
1676static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1677{
1678 struct pcie_device *pciedev;
1679 struct pcie_port_service_driver *driver;
1680
1681 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1682 return 0;
1683
1684 pciedev = to_pcie_device(dev);
1685 driver = to_service_driver(drv);
1686
1687 if (driver->service != pciedev->service)
1688 return 0;
1689
1690 if (driver->port_type != PCIE_ANY_PORT &&
1691 driver->port_type != pci_pcie_type(pciedev->port))
1692 return 0;
1693
1694 return 1;
1695}
1696
1697struct bus_type pcie_port_bus_type = {
1698 .name = "pci_express",
1699 .match = pcie_port_bus_match,
1700};
1701EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1702#endif
1703
1704static int __init pci_driver_init(void)
1705{
1706 int ret;
1707
1708 ret = bus_register(&pci_bus_type);
1709 if (ret)
1710 return ret;
1711
1712#ifdef CONFIG_PCIEPORTBUS
1713 ret = bus_register(&pcie_port_bus_type);
1714 if (ret)
1715 return ret;
1716#endif
1717 dma_debug_add_bus(&pci_bus_type);
1718 return 0;
1719}
1720postcore_initcall(pci_driver_init);
1721