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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2007 Novell Inc.
5 */
6
7#include <linux/pci.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/device.h>
11#include <linux/mempolicy.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <linux/sched.h>
15#include <linux/cpu.h>
16#include <linux/pm_runtime.h>
17#include <linux/suspend.h>
18#include <linux/kexec.h>
19#include <linux/of_device.h>
20#include <linux/acpi.h>
21#include "pci.h"
22#include "pcie/portdrv.h"
23
24struct pci_dynid {
25 struct list_head node;
26 struct pci_device_id id;
27};
28
29/**
30 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
31 * @drv: target pci driver
32 * @vendor: PCI vendor ID
33 * @device: PCI device ID
34 * @subvendor: PCI subvendor ID
35 * @subdevice: PCI subdevice ID
36 * @class: PCI class
37 * @class_mask: PCI class mask
38 * @driver_data: private driver data
39 *
40 * Adds a new dynamic pci device ID to this driver and causes the
41 * driver to probe for all devices again. @drv must have been
42 * registered prior to calling this function.
43 *
44 * CONTEXT:
45 * Does GFP_KERNEL allocation.
46 *
47 * RETURNS:
48 * 0 on success, -errno on failure.
49 */
50int pci_add_dynid(struct pci_driver *drv,
51 unsigned int vendor, unsigned int device,
52 unsigned int subvendor, unsigned int subdevice,
53 unsigned int class, unsigned int class_mask,
54 unsigned long driver_data)
55{
56 struct pci_dynid *dynid;
57
58 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
59 if (!dynid)
60 return -ENOMEM;
61
62 dynid->id.vendor = vendor;
63 dynid->id.device = device;
64 dynid->id.subvendor = subvendor;
65 dynid->id.subdevice = subdevice;
66 dynid->id.class = class;
67 dynid->id.class_mask = class_mask;
68 dynid->id.driver_data = driver_data;
69
70 spin_lock(&drv->dynids.lock);
71 list_add_tail(&dynid->node, &drv->dynids.list);
72 spin_unlock(&drv->dynids.lock);
73
74 return driver_attach(&drv->driver);
75}
76EXPORT_SYMBOL_GPL(pci_add_dynid);
77
78static void pci_free_dynids(struct pci_driver *drv)
79{
80 struct pci_dynid *dynid, *n;
81
82 spin_lock(&drv->dynids.lock);
83 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
84 list_del(&dynid->node);
85 kfree(dynid);
86 }
87 spin_unlock(&drv->dynids.lock);
88}
89
90/**
91 * store_new_id - sysfs frontend to pci_add_dynid()
92 * @driver: target device driver
93 * @buf: buffer for scanning device ID data
94 * @count: input size
95 *
96 * Allow PCI IDs to be added to an existing driver via sysfs.
97 */
98static ssize_t new_id_store(struct device_driver *driver, const char *buf,
99 size_t count)
100{
101 struct pci_driver *pdrv = to_pci_driver(driver);
102 const struct pci_device_id *ids = pdrv->id_table;
103 u32 vendor, device, subvendor = PCI_ANY_ID,
104 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
105 unsigned long driver_data = 0;
106 int fields = 0;
107 int retval = 0;
108
109 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
110 &vendor, &device, &subvendor, &subdevice,
111 &class, &class_mask, &driver_data);
112 if (fields < 2)
113 return -EINVAL;
114
115 if (fields != 7) {
116 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
117 if (!pdev)
118 return -ENOMEM;
119
120 pdev->vendor = vendor;
121 pdev->device = device;
122 pdev->subsystem_vendor = subvendor;
123 pdev->subsystem_device = subdevice;
124 pdev->class = class;
125
126 if (pci_match_id(pdrv->id_table, pdev))
127 retval = -EEXIST;
128
129 kfree(pdev);
130
131 if (retval)
132 return retval;
133 }
134
135 /* Only accept driver_data values that match an existing id_table
136 entry */
137 if (ids) {
138 retval = -EINVAL;
139 while (ids->vendor || ids->subvendor || ids->class_mask) {
140 if (driver_data == ids->driver_data) {
141 retval = 0;
142 break;
143 }
144 ids++;
145 }
146 if (retval) /* No match */
147 return retval;
148 }
149
150 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
151 class, class_mask, driver_data);
152 if (retval)
153 return retval;
154 return count;
155}
156static DRIVER_ATTR_WO(new_id);
157
158/**
159 * store_remove_id - remove a PCI device ID from this driver
160 * @driver: target device driver
161 * @buf: buffer for scanning device ID data
162 * @count: input size
163 *
164 * Removes a dynamic pci device ID to this driver.
165 */
166static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
167 size_t count)
168{
169 struct pci_dynid *dynid, *n;
170 struct pci_driver *pdrv = to_pci_driver(driver);
171 u32 vendor, device, subvendor = PCI_ANY_ID,
172 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
173 int fields = 0;
174 size_t retval = -ENODEV;
175
176 fields = sscanf(buf, "%x %x %x %x %x %x",
177 &vendor, &device, &subvendor, &subdevice,
178 &class, &class_mask);
179 if (fields < 2)
180 return -EINVAL;
181
182 spin_lock(&pdrv->dynids.lock);
183 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
184 struct pci_device_id *id = &dynid->id;
185 if ((id->vendor == vendor) &&
186 (id->device == device) &&
187 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
188 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
189 !((id->class ^ class) & class_mask)) {
190 list_del(&dynid->node);
191 kfree(dynid);
192 retval = count;
193 break;
194 }
195 }
196 spin_unlock(&pdrv->dynids.lock);
197
198 return retval;
199}
200static DRIVER_ATTR_WO(remove_id);
201
202static struct attribute *pci_drv_attrs[] = {
203 &driver_attr_new_id.attr,
204 &driver_attr_remove_id.attr,
205 NULL,
206};
207ATTRIBUTE_GROUPS(pci_drv);
208
209/**
210 * pci_match_id - See if a pci device matches a given pci_id table
211 * @ids: array of PCI device id structures to search in
212 * @dev: the PCI device structure to match against.
213 *
214 * Used by a driver to check whether a PCI device present in the
215 * system is in its list of supported devices. Returns the matching
216 * pci_device_id structure or %NULL if there is no match.
217 *
218 * Deprecated, don't use this as it will not catch any dynamic ids
219 * that a driver might want to check for.
220 */
221const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
222 struct pci_dev *dev)
223{
224 if (ids) {
225 while (ids->vendor || ids->subvendor || ids->class_mask) {
226 if (pci_match_one_device(ids, dev))
227 return ids;
228 ids++;
229 }
230 }
231 return NULL;
232}
233EXPORT_SYMBOL(pci_match_id);
234
235static const struct pci_device_id pci_device_id_any = {
236 .vendor = PCI_ANY_ID,
237 .device = PCI_ANY_ID,
238 .subvendor = PCI_ANY_ID,
239 .subdevice = PCI_ANY_ID,
240};
241
242/**
243 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
244 * @drv: the PCI driver to match against
245 * @dev: the PCI device structure to match against
246 *
247 * Used by a driver to check whether a PCI device present in the
248 * system is in its list of supported devices. Returns the matching
249 * pci_device_id structure or %NULL if there is no match.
250 */
251static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
252 struct pci_dev *dev)
253{
254 struct pci_dynid *dynid;
255 const struct pci_device_id *found_id = NULL;
256
257 /* When driver_override is set, only bind to the matching driver */
258 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
259 return NULL;
260
261 /* Look at the dynamic ids first, before the static ones */
262 spin_lock(&drv->dynids.lock);
263 list_for_each_entry(dynid, &drv->dynids.list, node) {
264 if (pci_match_one_device(&dynid->id, dev)) {
265 found_id = &dynid->id;
266 break;
267 }
268 }
269 spin_unlock(&drv->dynids.lock);
270
271 if (!found_id)
272 found_id = pci_match_id(drv->id_table, dev);
273
274 /* driver_override will always match, send a dummy id */
275 if (!found_id && dev->driver_override)
276 found_id = &pci_device_id_any;
277
278 return found_id;
279}
280
281struct drv_dev_and_id {
282 struct pci_driver *drv;
283 struct pci_dev *dev;
284 const struct pci_device_id *id;
285};
286
287static long local_pci_probe(void *_ddi)
288{
289 struct drv_dev_and_id *ddi = _ddi;
290 struct pci_dev *pci_dev = ddi->dev;
291 struct pci_driver *pci_drv = ddi->drv;
292 struct device *dev = &pci_dev->dev;
293 int rc;
294
295 /*
296 * Unbound PCI devices are always put in D0, regardless of
297 * runtime PM status. During probe, the device is set to
298 * active and the usage count is incremented. If the driver
299 * supports runtime PM, it should call pm_runtime_put_noidle(),
300 * or any other runtime PM helper function decrementing the usage
301 * count, in its probe routine and pm_runtime_get_noresume() in
302 * its remove routine.
303 */
304 pm_runtime_get_sync(dev);
305 pci_dev->driver = pci_drv;
306 rc = pci_drv->probe(pci_dev, ddi->id);
307 if (!rc)
308 return rc;
309 if (rc < 0) {
310 pci_dev->driver = NULL;
311 pm_runtime_put_sync(dev);
312 return rc;
313 }
314 /*
315 * Probe function should return < 0 for failure, 0 for success
316 * Treat values > 0 as success, but warn.
317 */
318 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
319 return 0;
320}
321
322static bool pci_physfn_is_probed(struct pci_dev *dev)
323{
324#ifdef CONFIG_PCI_IOV
325 return dev->is_virtfn && dev->physfn->is_probed;
326#else
327 return false;
328#endif
329}
330
331static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
332 const struct pci_device_id *id)
333{
334 int error, node, cpu;
335 struct drv_dev_and_id ddi = { drv, dev, id };
336
337 /*
338 * Execute driver initialization on node where the device is
339 * attached. This way the driver likely allocates its local memory
340 * on the right node.
341 */
342 node = dev_to_node(&dev->dev);
343 dev->is_probed = 1;
344
345 cpu_hotplug_disable();
346
347 /*
348 * Prevent nesting work_on_cpu() for the case where a Virtual Function
349 * device is probed from work_on_cpu() of the Physical device.
350 */
351 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
352 pci_physfn_is_probed(dev))
353 cpu = nr_cpu_ids;
354 else
355 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
356
357 if (cpu < nr_cpu_ids)
358 error = work_on_cpu(cpu, local_pci_probe, &ddi);
359 else
360 error = local_pci_probe(&ddi);
361
362 dev->is_probed = 0;
363 cpu_hotplug_enable();
364 return error;
365}
366
367/**
368 * __pci_device_probe - check if a driver wants to claim a specific PCI device
369 * @drv: driver to call to check if it wants the PCI device
370 * @pci_dev: PCI device being probed
371 *
372 * returns 0 on success, else error.
373 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
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 }
387 return error;
388}
389
390int __weak pcibios_alloc_irq(struct pci_dev *dev)
391{
392 return 0;
393}
394
395void __weak pcibios_free_irq(struct pci_dev *dev)
396{
397}
398
399#ifdef CONFIG_PCI_IOV
400static inline bool pci_device_can_probe(struct pci_dev *pdev)
401{
402 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
403 pdev->driver_override);
404}
405#else
406static inline bool pci_device_can_probe(struct pci_dev *pdev)
407{
408 return true;
409}
410#endif
411
412static int pci_device_probe(struct device *dev)
413{
414 int error;
415 struct pci_dev *pci_dev = to_pci_dev(dev);
416 struct pci_driver *drv = to_pci_driver(dev->driver);
417
418 if (!pci_device_can_probe(pci_dev))
419 return -ENODEV;
420
421 pci_assign_irq(pci_dev);
422
423 error = pcibios_alloc_irq(pci_dev);
424 if (error < 0)
425 return error;
426
427 pci_dev_get(pci_dev);
428 error = __pci_device_probe(drv, pci_dev);
429 if (error) {
430 pcibios_free_irq(pci_dev);
431 pci_dev_put(pci_dev);
432 }
433
434 return error;
435}
436
437static int pci_device_remove(struct device *dev)
438{
439 struct pci_dev *pci_dev = to_pci_dev(dev);
440 struct pci_driver *drv = pci_dev->driver;
441
442 if (drv) {
443 if (drv->remove) {
444 pm_runtime_get_sync(dev);
445 drv->remove(pci_dev);
446 pm_runtime_put_noidle(dev);
447 }
448 pcibios_free_irq(pci_dev);
449 pci_dev->driver = NULL;
450 pci_iov_remove(pci_dev);
451 }
452
453 /* Undo the runtime PM settings in local_pci_probe() */
454 pm_runtime_put_sync(dev);
455
456 /*
457 * If the device is still on, set the power state as "unknown",
458 * since it might change by the next time we load the driver.
459 */
460 if (pci_dev->current_state == PCI_D0)
461 pci_dev->current_state = PCI_UNKNOWN;
462
463 /*
464 * We would love to complain here if pci_dev->is_enabled is set, that
465 * the driver should have called pci_disable_device(), but the
466 * unfortunate fact is there are too many odd BIOS and bridge setups
467 * that don't like drivers doing that all of the time.
468 * Oh well, we can dream of sane hardware when we sleep, no matter how
469 * horrible the crap we have to deal with is when we are awake...
470 */
471
472 pci_dev_put(pci_dev);
473 return 0;
474}
475
476static void pci_device_shutdown(struct device *dev)
477{
478 struct pci_dev *pci_dev = to_pci_dev(dev);
479 struct pci_driver *drv = pci_dev->driver;
480
481 pm_runtime_resume(dev);
482
483 if (drv && drv->shutdown)
484 drv->shutdown(pci_dev);
485
486 /*
487 * If this is a kexec reboot, turn off Bus Master bit on the
488 * device to tell it to not continue to do DMA. Don't touch
489 * devices in D3cold or unknown states.
490 * If it is not a kexec reboot, firmware will hit the PCI
491 * devices with big hammer and stop their DMA any way.
492 */
493 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
494 pci_clear_master(pci_dev);
495}
496
497#ifdef CONFIG_PM
498
499/* Auxiliary functions used for system resume and run-time resume. */
500
501/**
502 * pci_restore_standard_config - restore standard config registers of PCI device
503 * @pci_dev: PCI device to handle
504 */
505static int pci_restore_standard_config(struct pci_dev *pci_dev)
506{
507 pci_update_current_state(pci_dev, PCI_UNKNOWN);
508
509 if (pci_dev->current_state != PCI_D0) {
510 int error = pci_set_power_state(pci_dev, PCI_D0);
511 if (error)
512 return error;
513 }
514
515 pci_restore_state(pci_dev);
516 pci_pme_restore(pci_dev);
517 return 0;
518}
519
520#endif
521
522#ifdef CONFIG_PM_SLEEP
523
524static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
525{
526 pci_power_up(pci_dev);
527 pci_restore_state(pci_dev);
528 pci_pme_restore(pci_dev);
529}
530
531/*
532 * Default "suspend" method for devices that have no driver provided suspend,
533 * or not even a driver at all (second part).
534 */
535static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
536{
537 /*
538 * mark its power state as "unknown", since we don't know if
539 * e.g. the BIOS will change its device state when we suspend.
540 */
541 if (pci_dev->current_state == PCI_D0)
542 pci_dev->current_state = PCI_UNKNOWN;
543}
544
545/*
546 * Default "resume" method for devices that have no driver provided resume,
547 * or not even a driver at all (second part).
548 */
549static int pci_pm_reenable_device(struct pci_dev *pci_dev)
550{
551 int retval;
552
553 /* if the device was enabled before suspend, reenable */
554 retval = pci_reenable_device(pci_dev);
555 /*
556 * if the device was busmaster before the suspend, make it busmaster
557 * again
558 */
559 if (pci_dev->is_busmaster)
560 pci_set_master(pci_dev);
561
562 return retval;
563}
564
565static int pci_legacy_suspend(struct device *dev, pm_message_t state)
566{
567 struct pci_dev *pci_dev = to_pci_dev(dev);
568 struct pci_driver *drv = pci_dev->driver;
569
570 if (drv && drv->suspend) {
571 pci_power_t prev = pci_dev->current_state;
572 int error;
573
574 error = drv->suspend(pci_dev, state);
575 suspend_report_result(drv->suspend, error);
576 if (error)
577 return error;
578
579 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
580 && pci_dev->current_state != PCI_UNKNOWN) {
581 WARN_ONCE(pci_dev->current_state != prev,
582 "PCI PM: Device state not saved by %pS\n",
583 drv->suspend);
584 }
585 }
586
587 pci_fixup_device(pci_fixup_suspend, pci_dev);
588
589 return 0;
590}
591
592static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
593{
594 struct pci_dev *pci_dev = to_pci_dev(dev);
595 struct pci_driver *drv = pci_dev->driver;
596
597 if (drv && drv->suspend_late) {
598 pci_power_t prev = pci_dev->current_state;
599 int error;
600
601 error = drv->suspend_late(pci_dev, state);
602 suspend_report_result(drv->suspend_late, error);
603 if (error)
604 return error;
605
606 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
607 && pci_dev->current_state != PCI_UNKNOWN) {
608 WARN_ONCE(pci_dev->current_state != prev,
609 "PCI PM: Device state not saved by %pS\n",
610 drv->suspend_late);
611 goto Fixup;
612 }
613 }
614
615 if (!pci_dev->state_saved)
616 pci_save_state(pci_dev);
617
618 pci_pm_set_unknown_state(pci_dev);
619
620Fixup:
621 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
622
623 return 0;
624}
625
626static int pci_legacy_resume_early(struct device *dev)
627{
628 struct pci_dev *pci_dev = to_pci_dev(dev);
629 struct pci_driver *drv = pci_dev->driver;
630
631 return drv && drv->resume_early ?
632 drv->resume_early(pci_dev) : 0;
633}
634
635static int pci_legacy_resume(struct device *dev)
636{
637 struct pci_dev *pci_dev = to_pci_dev(dev);
638 struct pci_driver *drv = pci_dev->driver;
639
640 pci_fixup_device(pci_fixup_resume, pci_dev);
641
642 return drv && drv->resume ?
643 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
644}
645
646/* Auxiliary functions used by the new power management framework */
647
648static void pci_pm_default_resume(struct pci_dev *pci_dev)
649{
650 pci_fixup_device(pci_fixup_resume, pci_dev);
651 pci_enable_wake(pci_dev, PCI_D0, false);
652}
653
654static void pci_pm_default_suspend(struct pci_dev *pci_dev)
655{
656 /* Disable non-bridge devices without PM support */
657 if (!pci_has_subordinate(pci_dev))
658 pci_disable_enabled_device(pci_dev);
659}
660
661static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
662{
663 struct pci_driver *drv = pci_dev->driver;
664 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
665 || drv->resume_early);
666
667 /*
668 * Legacy PM support is used by default, so warn if the new framework is
669 * supported as well. Drivers are supposed to support either the
670 * former, or the latter, but not both at the same time.
671 */
672 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
673 drv->name, pci_dev->vendor, pci_dev->device);
674
675 return ret;
676}
677
678/* New power management framework */
679
680static int pci_pm_prepare(struct device *dev)
681{
682 struct device_driver *drv = dev->driver;
683 struct pci_dev *pci_dev = to_pci_dev(dev);
684
685 if (drv && drv->pm && drv->pm->prepare) {
686 int error = drv->pm->prepare(dev);
687 if (error < 0)
688 return error;
689
690 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
691 return 0;
692 }
693 if (pci_dev_need_resume(pci_dev))
694 return 0;
695
696 /*
697 * The PME setting needs to be adjusted here in case the direct-complete
698 * optimization is used with respect to this device.
699 */
700 pci_dev_adjust_pme(pci_dev);
701 return 1;
702}
703
704static void pci_pm_complete(struct device *dev)
705{
706 struct pci_dev *pci_dev = to_pci_dev(dev);
707
708 pci_dev_complete_resume(pci_dev);
709 pm_generic_complete(dev);
710
711 /* Resume device if platform firmware has put it in reset-power-on */
712 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
713 pci_power_t pre_sleep_state = pci_dev->current_state;
714
715 pci_refresh_power_state(pci_dev);
716 /*
717 * On platforms with ACPI this check may also trigger for
718 * devices sharing power resources if one of those power
719 * resources has been activated as a result of a change of the
720 * power state of another device sharing it. However, in that
721 * case it is also better to resume the device, in general.
722 */
723 if (pci_dev->current_state < pre_sleep_state)
724 pm_request_resume(dev);
725 }
726}
727
728#else /* !CONFIG_PM_SLEEP */
729
730#define pci_pm_prepare NULL
731#define pci_pm_complete NULL
732
733#endif /* !CONFIG_PM_SLEEP */
734
735#ifdef CONFIG_SUSPEND
736static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
737{
738 /*
739 * Some BIOSes forget to clear Root PME Status bits after system
740 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
741 * Clear those bits now just in case (shouldn't hurt).
742 */
743 if (pci_is_pcie(pci_dev) &&
744 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
745 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
746 pcie_clear_root_pme_status(pci_dev);
747}
748
749static int pci_pm_suspend(struct device *dev)
750{
751 struct pci_dev *pci_dev = to_pci_dev(dev);
752 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
753
754 pci_dev->skip_bus_pm = false;
755
756 if (pci_has_legacy_pm_support(pci_dev))
757 return pci_legacy_suspend(dev, PMSG_SUSPEND);
758
759 if (!pm) {
760 pci_pm_default_suspend(pci_dev);
761 return 0;
762 }
763
764 /*
765 * PCI devices suspended at run time may need to be resumed at this
766 * point, because in general it may be necessary to reconfigure them for
767 * system suspend. Namely, if the device is expected to wake up the
768 * system from the sleep state, it may have to be reconfigured for this
769 * purpose, or if the device is not expected to wake up the system from
770 * the sleep state, it should be prevented from signaling wakeup events
771 * going forward.
772 *
773 * Also if the driver of the device does not indicate that its system
774 * suspend callbacks can cope with runtime-suspended devices, it is
775 * better to resume the device from runtime suspend here.
776 */
777 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
778 pci_dev_need_resume(pci_dev)) {
779 pm_runtime_resume(dev);
780 pci_dev->state_saved = false;
781 } else {
782 pci_dev_adjust_pme(pci_dev);
783 }
784
785 if (pm->suspend) {
786 pci_power_t prev = pci_dev->current_state;
787 int error;
788
789 error = pm->suspend(dev);
790 suspend_report_result(pm->suspend, error);
791 if (error)
792 return error;
793
794 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
795 && pci_dev->current_state != PCI_UNKNOWN) {
796 WARN_ONCE(pci_dev->current_state != prev,
797 "PCI PM: State of device not saved by %pS\n",
798 pm->suspend);
799 }
800 }
801
802 return 0;
803}
804
805static int pci_pm_suspend_late(struct device *dev)
806{
807 if (dev_pm_smart_suspend_and_suspended(dev))
808 return 0;
809
810 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
811
812 return pm_generic_suspend_late(dev);
813}
814
815static int pci_pm_suspend_noirq(struct device *dev)
816{
817 struct pci_dev *pci_dev = to_pci_dev(dev);
818 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
819
820 if (dev_pm_smart_suspend_and_suspended(dev)) {
821 dev->power.may_skip_resume = true;
822 return 0;
823 }
824
825 if (pci_has_legacy_pm_support(pci_dev))
826 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
827
828 if (!pm) {
829 pci_save_state(pci_dev);
830 goto Fixup;
831 }
832
833 if (pm->suspend_noirq) {
834 pci_power_t prev = pci_dev->current_state;
835 int error;
836
837 error = pm->suspend_noirq(dev);
838 suspend_report_result(pm->suspend_noirq, error);
839 if (error)
840 return error;
841
842 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
843 && pci_dev->current_state != PCI_UNKNOWN) {
844 WARN_ONCE(pci_dev->current_state != prev,
845 "PCI PM: State of device not saved by %pS\n",
846 pm->suspend_noirq);
847 goto Fixup;
848 }
849 }
850
851 if (pci_dev->skip_bus_pm) {
852 /*
853 * Either the device is a bridge with a child in D0 below it, or
854 * the function is running for the second time in a row without
855 * going through full resume, which is possible only during
856 * suspend-to-idle in a spurious wakeup case. The device should
857 * be in D0 at this point, but if it is a bridge, it may be
858 * necessary to save its state.
859 */
860 if (!pci_dev->state_saved)
861 pci_save_state(pci_dev);
862 } else if (!pci_dev->state_saved) {
863 pci_save_state(pci_dev);
864 if (pci_power_manageable(pci_dev))
865 pci_prepare_to_sleep(pci_dev);
866 }
867
868 dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
869 pci_power_name(pci_dev->current_state));
870
871 if (pci_dev->current_state == PCI_D0) {
872 pci_dev->skip_bus_pm = true;
873 /*
874 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
875 * downstream device is in D0, so avoid changing the power state
876 * of the parent bridge by setting the skip_bus_pm flag for it.
877 */
878 if (pci_dev->bus->self)
879 pci_dev->bus->self->skip_bus_pm = true;
880 }
881
882 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
883 dev_dbg(dev, "PCI PM: Skipped\n");
884 goto Fixup;
885 }
886
887 pci_pm_set_unknown_state(pci_dev);
888
889 /*
890 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
891 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
892 * hasn't been quiesced and tries to turn it off. If the controller
893 * is already in D3, this can hang or cause memory corruption.
894 *
895 * Since the value of the COMMAND register doesn't matter once the
896 * device has been suspended, we can safely set it to 0 here.
897 */
898 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
899 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
900
901Fixup:
902 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
903
904 /*
905 * If the target system sleep state is suspend-to-idle, it is sufficient
906 * to check whether or not the device's wakeup settings are good for
907 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
908 * pci_pm_complete() to take care of fixing up the device's state
909 * anyway, if need be.
910 */
911 dev->power.may_skip_resume = device_may_wakeup(dev) ||
912 !device_can_wakeup(dev);
913
914 return 0;
915}
916
917static int pci_pm_resume_noirq(struct device *dev)
918{
919 struct pci_dev *pci_dev = to_pci_dev(dev);
920 struct device_driver *drv = dev->driver;
921 int error = 0;
922
923 if (dev_pm_may_skip_resume(dev))
924 return 0;
925
926 /*
927 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
928 * during system suspend, so update their runtime PM status to "active"
929 * as they are going to be put into D0 shortly.
930 */
931 if (dev_pm_smart_suspend_and_suspended(dev))
932 pm_runtime_set_active(dev);
933
934 /*
935 * In the suspend-to-idle case, devices left in D0 during suspend will
936 * stay in D0, so it is not necessary to restore or update their
937 * configuration here and attempting to put them into D0 again is
938 * pointless, so avoid doing that.
939 */
940 if (!(pci_dev->skip_bus_pm && pm_suspend_no_platform()))
941 pci_pm_default_resume_early(pci_dev);
942
943 pci_fixup_device(pci_fixup_resume_early, pci_dev);
944
945 if (pci_has_legacy_pm_support(pci_dev))
946 return pci_legacy_resume_early(dev);
947
948 pcie_pme_root_status_cleanup(pci_dev);
949
950 if (drv && drv->pm && drv->pm->resume_noirq)
951 error = drv->pm->resume_noirq(dev);
952
953 return error;
954}
955
956static int pci_pm_resume(struct device *dev)
957{
958 struct pci_dev *pci_dev = to_pci_dev(dev);
959 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
960 int error = 0;
961
962 /*
963 * This is necessary for the suspend error path in which resume is
964 * called without restoring the standard config registers of the device.
965 */
966 if (pci_dev->state_saved)
967 pci_restore_standard_config(pci_dev);
968
969 if (pci_has_legacy_pm_support(pci_dev))
970 return pci_legacy_resume(dev);
971
972 pci_pm_default_resume(pci_dev);
973
974 if (pm) {
975 if (pm->resume)
976 error = pm->resume(dev);
977 } else {
978 pci_pm_reenable_device(pci_dev);
979 }
980
981 return error;
982}
983
984#else /* !CONFIG_SUSPEND */
985
986#define pci_pm_suspend NULL
987#define pci_pm_suspend_late NULL
988#define pci_pm_suspend_noirq NULL
989#define pci_pm_resume NULL
990#define pci_pm_resume_noirq NULL
991
992#endif /* !CONFIG_SUSPEND */
993
994#ifdef CONFIG_HIBERNATE_CALLBACKS
995
996
997/*
998 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
999 * a hibernate transition
1000 */
1001struct dev_pm_ops __weak pcibios_pm_ops;
1002
1003static int pci_pm_freeze(struct device *dev)
1004{
1005 struct pci_dev *pci_dev = to_pci_dev(dev);
1006 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1007
1008 if (pci_has_legacy_pm_support(pci_dev))
1009 return pci_legacy_suspend(dev, PMSG_FREEZE);
1010
1011 if (!pm) {
1012 pci_pm_default_suspend(pci_dev);
1013 return 0;
1014 }
1015
1016 /*
1017 * Resume all runtime-suspended devices before creating a snapshot
1018 * image of system memory, because the restore kernel generally cannot
1019 * be expected to always handle them consistently and they need to be
1020 * put into the runtime-active metastate during system resume anyway,
1021 * so it is better to ensure that the state saved in the image will be
1022 * always consistent with that.
1023 */
1024 pm_runtime_resume(dev);
1025 pci_dev->state_saved = false;
1026
1027 if (pm->freeze) {
1028 int error;
1029
1030 error = pm->freeze(dev);
1031 suspend_report_result(pm->freeze, error);
1032 if (error)
1033 return error;
1034 }
1035
1036 return 0;
1037}
1038
1039static int pci_pm_freeze_noirq(struct device *dev)
1040{
1041 struct pci_dev *pci_dev = to_pci_dev(dev);
1042 struct device_driver *drv = dev->driver;
1043
1044 if (pci_has_legacy_pm_support(pci_dev))
1045 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1046
1047 if (drv && drv->pm && drv->pm->freeze_noirq) {
1048 int error;
1049
1050 error = drv->pm->freeze_noirq(dev);
1051 suspend_report_result(drv->pm->freeze_noirq, error);
1052 if (error)
1053 return error;
1054 }
1055
1056 if (!pci_dev->state_saved)
1057 pci_save_state(pci_dev);
1058
1059 pci_pm_set_unknown_state(pci_dev);
1060
1061 if (pcibios_pm_ops.freeze_noirq)
1062 return pcibios_pm_ops.freeze_noirq(dev);
1063
1064 return 0;
1065}
1066
1067static int pci_pm_thaw_noirq(struct device *dev)
1068{
1069 struct pci_dev *pci_dev = to_pci_dev(dev);
1070 struct device_driver *drv = dev->driver;
1071 int error = 0;
1072
1073 if (pcibios_pm_ops.thaw_noirq) {
1074 error = pcibios_pm_ops.thaw_noirq(dev);
1075 if (error)
1076 return error;
1077 }
1078
1079 if (pci_has_legacy_pm_support(pci_dev))
1080 return pci_legacy_resume_early(dev);
1081
1082 /*
1083 * pci_restore_state() requires the device to be in D0 (because of MSI
1084 * restoration among other things), so force it into D0 in case the
1085 * driver's "freeze" callbacks put it into a low-power state directly.
1086 */
1087 pci_set_power_state(pci_dev, PCI_D0);
1088 pci_restore_state(pci_dev);
1089
1090 if (drv && drv->pm && drv->pm->thaw_noirq)
1091 error = drv->pm->thaw_noirq(dev);
1092
1093 return error;
1094}
1095
1096static int pci_pm_thaw(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 int error = 0;
1101
1102 if (pci_has_legacy_pm_support(pci_dev))
1103 return pci_legacy_resume(dev);
1104
1105 if (pm) {
1106 if (pm->thaw)
1107 error = pm->thaw(dev);
1108 } else {
1109 pci_pm_reenable_device(pci_dev);
1110 }
1111
1112 pci_dev->state_saved = false;
1113
1114 return error;
1115}
1116
1117static int pci_pm_poweroff(struct device *dev)
1118{
1119 struct pci_dev *pci_dev = to_pci_dev(dev);
1120 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1121
1122 if (pci_has_legacy_pm_support(pci_dev))
1123 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1124
1125 if (!pm) {
1126 pci_pm_default_suspend(pci_dev);
1127 return 0;
1128 }
1129
1130 /* The reason to do that is the same as in pci_pm_suspend(). */
1131 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1132 pci_dev_need_resume(pci_dev)) {
1133 pm_runtime_resume(dev);
1134 pci_dev->state_saved = false;
1135 } else {
1136 pci_dev_adjust_pme(pci_dev);
1137 }
1138
1139 if (pm->poweroff) {
1140 int error;
1141
1142 error = pm->poweroff(dev);
1143 suspend_report_result(pm->poweroff, error);
1144 if (error)
1145 return error;
1146 }
1147
1148 return 0;
1149}
1150
1151static int pci_pm_poweroff_late(struct device *dev)
1152{
1153 if (dev_pm_smart_suspend_and_suspended(dev))
1154 return 0;
1155
1156 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1157
1158 return pm_generic_poweroff_late(dev);
1159}
1160
1161static int pci_pm_poweroff_noirq(struct device *dev)
1162{
1163 struct pci_dev *pci_dev = to_pci_dev(dev);
1164 struct device_driver *drv = dev->driver;
1165
1166 if (dev_pm_smart_suspend_and_suspended(dev))
1167 return 0;
1168
1169 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1170 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1171
1172 if (!drv || !drv->pm) {
1173 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1174 return 0;
1175 }
1176
1177 if (drv->pm->poweroff_noirq) {
1178 int error;
1179
1180 error = drv->pm->poweroff_noirq(dev);
1181 suspend_report_result(drv->pm->poweroff_noirq, error);
1182 if (error)
1183 return error;
1184 }
1185
1186 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1187 pci_prepare_to_sleep(pci_dev);
1188
1189 /*
1190 * The reason for doing this here is the same as for the analogous code
1191 * in pci_pm_suspend_noirq().
1192 */
1193 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1194 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1195
1196 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1197
1198 if (pcibios_pm_ops.poweroff_noirq)
1199 return pcibios_pm_ops.poweroff_noirq(dev);
1200
1201 return 0;
1202}
1203
1204static int pci_pm_restore_noirq(struct device *dev)
1205{
1206 struct pci_dev *pci_dev = to_pci_dev(dev);
1207 struct device_driver *drv = dev->driver;
1208 int error = 0;
1209
1210 if (pcibios_pm_ops.restore_noirq) {
1211 error = pcibios_pm_ops.restore_noirq(dev);
1212 if (error)
1213 return error;
1214 }
1215
1216 pci_pm_default_resume_early(pci_dev);
1217 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1218
1219 if (pci_has_legacy_pm_support(pci_dev))
1220 return pci_legacy_resume_early(dev);
1221
1222 if (drv && drv->pm && drv->pm->restore_noirq)
1223 error = drv->pm->restore_noirq(dev);
1224
1225 return error;
1226}
1227
1228static int pci_pm_restore(struct device *dev)
1229{
1230 struct pci_dev *pci_dev = to_pci_dev(dev);
1231 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1232 int error = 0;
1233
1234 /*
1235 * This is necessary for the hibernation error path in which restore is
1236 * called without restoring the standard config registers of the device.
1237 */
1238 if (pci_dev->state_saved)
1239 pci_restore_standard_config(pci_dev);
1240
1241 if (pci_has_legacy_pm_support(pci_dev))
1242 return pci_legacy_resume(dev);
1243
1244 pci_pm_default_resume(pci_dev);
1245
1246 if (pm) {
1247 if (pm->restore)
1248 error = pm->restore(dev);
1249 } else {
1250 pci_pm_reenable_device(pci_dev);
1251 }
1252
1253 return error;
1254}
1255
1256#else /* !CONFIG_HIBERNATE_CALLBACKS */
1257
1258#define pci_pm_freeze NULL
1259#define pci_pm_freeze_noirq NULL
1260#define pci_pm_thaw NULL
1261#define pci_pm_thaw_noirq NULL
1262#define pci_pm_poweroff NULL
1263#define pci_pm_poweroff_late NULL
1264#define pci_pm_poweroff_noirq NULL
1265#define pci_pm_restore NULL
1266#define pci_pm_restore_noirq NULL
1267
1268#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1269
1270#ifdef CONFIG_PM
1271
1272static int pci_pm_runtime_suspend(struct device *dev)
1273{
1274 struct pci_dev *pci_dev = to_pci_dev(dev);
1275 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1276 pci_power_t prev = pci_dev->current_state;
1277 int error;
1278
1279 /*
1280 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1281 * but it may go to D3cold when the bridge above it runtime suspends.
1282 * Save its config space in case that happens.
1283 */
1284 if (!pci_dev->driver) {
1285 pci_save_state(pci_dev);
1286 return 0;
1287 }
1288
1289 pci_dev->state_saved = false;
1290 if (pm && pm->runtime_suspend) {
1291 error = pm->runtime_suspend(dev);
1292 /*
1293 * -EBUSY and -EAGAIN is used to request the runtime PM core
1294 * to schedule a new suspend, so log the event only with debug
1295 * log level.
1296 */
1297 if (error == -EBUSY || error == -EAGAIN) {
1298 dev_dbg(dev, "can't suspend now (%ps returned %d)\n",
1299 pm->runtime_suspend, error);
1300 return error;
1301 } else if (error) {
1302 dev_err(dev, "can't suspend (%ps returned %d)\n",
1303 pm->runtime_suspend, error);
1304 return error;
1305 }
1306 }
1307
1308 pci_fixup_device(pci_fixup_suspend, pci_dev);
1309
1310 if (pm && pm->runtime_suspend
1311 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1312 && pci_dev->current_state != PCI_UNKNOWN) {
1313 WARN_ONCE(pci_dev->current_state != prev,
1314 "PCI PM: State of device not saved by %pS\n",
1315 pm->runtime_suspend);
1316 return 0;
1317 }
1318
1319 if (!pci_dev->state_saved) {
1320 pci_save_state(pci_dev);
1321 pci_finish_runtime_suspend(pci_dev);
1322 }
1323
1324 return 0;
1325}
1326
1327static int pci_pm_runtime_resume(struct device *dev)
1328{
1329 int rc = 0;
1330 struct pci_dev *pci_dev = to_pci_dev(dev);
1331 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1332
1333 /*
1334 * Restoring config space is necessary even if the device is not bound
1335 * to a driver because although we left it in D0, it may have gone to
1336 * D3cold when the bridge above it runtime suspended.
1337 */
1338 pci_restore_standard_config(pci_dev);
1339
1340 if (!pci_dev->driver)
1341 return 0;
1342
1343 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1344 pci_enable_wake(pci_dev, PCI_D0, false);
1345 pci_fixup_device(pci_fixup_resume, pci_dev);
1346
1347 if (pm && pm->runtime_resume)
1348 rc = pm->runtime_resume(dev);
1349
1350 pci_dev->runtime_d3cold = false;
1351
1352 return rc;
1353}
1354
1355static int pci_pm_runtime_idle(struct device *dev)
1356{
1357 struct pci_dev *pci_dev = to_pci_dev(dev);
1358 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1359 int ret = 0;
1360
1361 /*
1362 * If pci_dev->driver is not set (unbound), the device should
1363 * always remain in D0 regardless of the runtime PM status
1364 */
1365 if (!pci_dev->driver)
1366 return 0;
1367
1368 if (!pm)
1369 return -ENOSYS;
1370
1371 if (pm->runtime_idle)
1372 ret = pm->runtime_idle(dev);
1373
1374 return ret;
1375}
1376
1377static const struct dev_pm_ops pci_dev_pm_ops = {
1378 .prepare = pci_pm_prepare,
1379 .complete = pci_pm_complete,
1380 .suspend = pci_pm_suspend,
1381 .suspend_late = pci_pm_suspend_late,
1382 .resume = pci_pm_resume,
1383 .freeze = pci_pm_freeze,
1384 .thaw = pci_pm_thaw,
1385 .poweroff = pci_pm_poweroff,
1386 .poweroff_late = pci_pm_poweroff_late,
1387 .restore = pci_pm_restore,
1388 .suspend_noirq = pci_pm_suspend_noirq,
1389 .resume_noirq = pci_pm_resume_noirq,
1390 .freeze_noirq = pci_pm_freeze_noirq,
1391 .thaw_noirq = pci_pm_thaw_noirq,
1392 .poweroff_noirq = pci_pm_poweroff_noirq,
1393 .restore_noirq = pci_pm_restore_noirq,
1394 .runtime_suspend = pci_pm_runtime_suspend,
1395 .runtime_resume = pci_pm_runtime_resume,
1396 .runtime_idle = pci_pm_runtime_idle,
1397};
1398
1399#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1400
1401#else /* !CONFIG_PM */
1402
1403#define pci_pm_runtime_suspend NULL
1404#define pci_pm_runtime_resume NULL
1405#define pci_pm_runtime_idle NULL
1406
1407#define PCI_PM_OPS_PTR NULL
1408
1409#endif /* !CONFIG_PM */
1410
1411/**
1412 * __pci_register_driver - register a new pci driver
1413 * @drv: the driver structure to register
1414 * @owner: owner module of drv
1415 * @mod_name: module name string
1416 *
1417 * Adds the driver structure to the list of registered drivers.
1418 * Returns a negative value on error, otherwise 0.
1419 * If no error occurred, the driver remains registered even if
1420 * no device was claimed during registration.
1421 */
1422int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1423 const char *mod_name)
1424{
1425 /* initialize common driver fields */
1426 drv->driver.name = drv->name;
1427 drv->driver.bus = &pci_bus_type;
1428 drv->driver.owner = owner;
1429 drv->driver.mod_name = mod_name;
1430 drv->driver.groups = drv->groups;
1431
1432 spin_lock_init(&drv->dynids.lock);
1433 INIT_LIST_HEAD(&drv->dynids.list);
1434
1435 /* register with core */
1436 return driver_register(&drv->driver);
1437}
1438EXPORT_SYMBOL(__pci_register_driver);
1439
1440/**
1441 * pci_unregister_driver - unregister a pci driver
1442 * @drv: the driver structure to unregister
1443 *
1444 * Deletes the driver structure from the list of registered PCI drivers,
1445 * gives it a chance to clean up by calling its remove() function for
1446 * each device it was responsible for, and marks those devices as
1447 * driverless.
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 * pci_dev_driver - get the pci_driver of a device
1463 * @dev: the device to query
1464 *
1465 * Returns the appropriate pci_driver structure or %NULL if there is no
1466 * registered driver for the device.
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 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1484 * @dev: the PCI device structure to match against
1485 * @drv: the device driver to search for matching PCI device id structures
1486 *
1487 * Used by a driver to check whether a PCI device present in the
1488 * system is in its list of supported devices. Returns the matching
1489 * pci_device_id structure or %NULL if there is no match.
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 * pci_dev_get - increments the reference count of the pci device structure
1510 * @dev: the device being referenced
1511 *
1512 * Each live reference to a device should be refcounted.
1513 *
1514 * Drivers for PCI devices should normally record such references in
1515 * their probe() methods, when they bind to a device, and release
1516 * them by calling pci_dev_put(), in their disconnect() methods.
1517 *
1518 * A pointer to the device with the incremented reference counter is returned.
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 * pci_dev_put - release a use of the pci device structure
1530 * @dev: device that's been disconnected
1531 *
1532 * Must be called when a user of a device is finished with it. When the last
1533 * user of the device calls this function, the memory of the device is freed.
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_PCIEPORTBUS) || defined(CONFIG_EEH)
1575/**
1576 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1577 * @pdev: PCI device undergoing error recovery
1578 * @err_type: type of error event
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 * pci_dma_configure - Setup DMA configuration
1617 * @dev: ptr to dev structure
1618 *
1619 * Function to update PCI devices's DMA configuration using the same
1620 * info from the OF node or ACPI node of host bridge's parent (if any).
1621 */
1622static int pci_dma_configure(struct device *dev)
1623{
1624 struct device *bridge;
1625 int ret = 0;
1626
1627 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1628
1629 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1630 bridge->parent->of_node) {
1631 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1632 } else if (has_acpi_companion(bridge)) {
1633 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1634
1635 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1636 }
1637
1638 pci_put_host_bridge_device(bridge);
1639 return ret;
1640}
1641
1642struct bus_type pci_bus_type = {
1643 .name = "pci",
1644 .match = pci_bus_match,
1645 .uevent = pci_uevent,
1646 .probe = pci_device_probe,
1647 .remove = pci_device_remove,
1648 .shutdown = pci_device_shutdown,
1649 .dev_groups = pci_dev_groups,
1650 .bus_groups = pci_bus_groups,
1651 .drv_groups = pci_drv_groups,
1652 .pm = PCI_PM_OPS_PTR,
1653 .num_vf = pci_bus_num_vf,
1654 .dma_configure = pci_dma_configure,
1655};
1656EXPORT_SYMBOL(pci_bus_type);
1657
1658#ifdef CONFIG_PCIEPORTBUS
1659static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1660{
1661 struct pcie_device *pciedev;
1662 struct pcie_port_service_driver *driver;
1663
1664 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1665 return 0;
1666
1667 pciedev = to_pcie_device(dev);
1668 driver = to_service_driver(drv);
1669
1670 if (driver->service != pciedev->service)
1671 return 0;
1672
1673 if (driver->port_type != PCIE_ANY_PORT &&
1674 driver->port_type != pci_pcie_type(pciedev->port))
1675 return 0;
1676
1677 return 1;
1678}
1679
1680struct bus_type pcie_port_bus_type = {
1681 .name = "pci_express",
1682 .match = pcie_port_bus_match,
1683};
1684EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1685#endif
1686
1687static int __init pci_driver_init(void)
1688{
1689 int ret;
1690
1691 ret = bus_register(&pci_bus_type);
1692 if (ret)
1693 return ret;
1694
1695#ifdef CONFIG_PCIEPORTBUS
1696 ret = bus_register(&pcie_port_bus_type);
1697 if (ret)
1698 return ret;
1699#endif
1700 dma_debug_add_bus(&pci_bus_type);
1701 return 0;
1702}
1703postcore_initcall(pci_driver_init);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
4 * (C) Copyright 2007 Novell Inc.
5 */
6
7#include <linux/pci.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/device.h>
11#include <linux/mempolicy.h>
12#include <linux/string.h>
13#include <linux/slab.h>
14#include <linux/sched.h>
15#include <linux/sched/isolation.h>
16#include <linux/cpu.h>
17#include <linux/pm_runtime.h>
18#include <linux/suspend.h>
19#include <linux/kexec.h>
20#include <linux/of_device.h>
21#include <linux/acpi.h>
22#include <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
32/**
33 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
34 * @drv: target pci driver
35 * @vendor: PCI vendor ID
36 * @device: PCI device ID
37 * @subvendor: PCI subvendor ID
38 * @subdevice: PCI subdevice ID
39 * @class: PCI class
40 * @class_mask: PCI class mask
41 * @driver_data: private driver data
42 *
43 * Adds a new dynamic pci device ID to this driver and causes the
44 * driver to probe for all devices again. @drv must have been
45 * registered prior to calling this function.
46 *
47 * CONTEXT:
48 * Does GFP_KERNEL allocation.
49 *
50 * RETURNS:
51 * 0 on success, -errno on failure.
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 * pci_match_id - See if a PCI device matches a given pci_id table
95 * @ids: array of PCI device ID structures to search in
96 * @dev: the PCI device structure to match against.
97 *
98 * Used by a driver to check whether a PCI device is in its list of
99 * supported devices. Returns the matching pci_device_id structure or
100 * %NULL if there is no match.
101 *
102 * Deprecated; don't use this as it will not catch any dynamic IDs
103 * that a driver might want to check for.
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 * pci_match_device - See if a device matches a driver's list of IDs
128 * @drv: the PCI driver to match against
129 * @dev: the PCI device structure to match against
130 *
131 * Used by a driver to check whether a PCI device is in its list of
132 * supported devices or in the dynids list, which may have been augmented
133 * via the sysfs "new_id" file. Returns the matching pci_device_id
134 * structure or %NULL if there is no match.
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 /* When driver_override is set, only bind to the matching driver */
143 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
144 return NULL;
145
146 /* Look at the dynamic ids first, before the static ones */
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 * The match table is split based on driver_override.
163 * In case override_only was set, enforce driver_override
164 * matching.
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 /* driver_override will always match, send a dummy id */
175 if (dev->driver_override)
176 return &pci_device_id_any;
177 return NULL;
178}
179
180/**
181 * new_id_store - sysfs frontend to pci_add_dynid()
182 * @driver: target device driver
183 * @buf: buffer for scanning device ID data
184 * @count: input size
185 *
186 * Allow PCI IDs to be added to an existing driver via sysfs.
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;
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 /* Only accept driver_data values that match an existing id_table
226 entry */
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) /* No match */
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 * remove_id_store - remove a PCI device ID from this driver
250 * @driver: target device driver
251 * @buf: buffer for scanning device ID data
252 * @count: input size
253 *
254 * Removes a dynamic pci device ID to this driver.
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;
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 * Unbound PCI devices are always put in D0, regardless of
315 * runtime PM status. During probe, the device is set to
316 * active and the usage count is incremented. If the driver
317 * supports runtime PM, it should call pm_runtime_put_noidle(),
318 * or any other runtime PM helper function decrementing the usage
319 * count, in its probe routine and pm_runtime_get_noresume() in
320 * its remove routine.
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 * Probe function should return < 0 for failure, 0 for success
334 * Treat values > 0 as success, but warn.
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 * Execute driver initialization on node where the device is
358 * attached. This way the driver likely allocates its local memory
359 * on the right node.
360 */
361 node = dev_to_node(&dev->dev);
362 dev->is_probed = 1;
363
364 cpu_hotplug_disable();
365
366 /*
367 * Prevent nesting work_on_cpu() for the case where a Virtual Function
368 * device is probed from work_on_cpu() of the Physical device.
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 * __pci_device_probe - check if a driver wants to claim a specific PCI device
401 * @drv: driver to call to check if it wants the PCI device
402 * @pci_dev: PCI device being probed
403 *
404 * returns 0 on success, else error.
405 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
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 /* Undo the runtime PM settings in local_pci_probe() */
484 pm_runtime_put_sync(dev);
485
486 /*
487 * If the device is still on, set the power state as "unknown",
488 * since it might change by the next time we load the driver.
489 */
490 if (pci_dev->current_state == PCI_D0)
491 pci_dev->current_state = PCI_UNKNOWN;
492
493 /*
494 * We would love to complain here if pci_dev->is_enabled is set, that
495 * the driver should have called pci_disable_device(), but the
496 * unfortunate fact is there are too many odd BIOS and bridge setups
497 * that don't like drivers doing that all of the time.
498 * Oh well, we can dream of sane hardware when we sleep, no matter how
499 * horrible the crap we have to deal with is when we are awake...
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 * If this is a kexec reboot, turn off Bus Master bit on the
517 * device to tell it to not continue to do DMA. Don't touch
518 * devices in D3cold or unknown states.
519 * If it is not a kexec reboot, firmware will hit the PCI
520 * devices with big hammer and stop their DMA any way.
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/* Auxiliary functions used for system resume */
529
530/**
531 * pci_restore_standard_config - restore standard config registers of PCI device
532 * @pci_dev: PCI device to handle
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 /* CONFIG_PM_SLEEP */
549
550#ifdef CONFIG_PM
551
552/* Auxiliary functions used for system resume and run-time resume */
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 int ret;
576
577 ret = pci_bridge_wait_for_secondary_bus(pci_dev, "resume");
578 if (ret) {
579 /*
580 * The downstream link failed to come up, so mark the
581 * devices below as disconnected to make sure we don't
582 * attempt to resume them.
583 */
584 pci_walk_bus(pci_dev->subordinate, pci_dev_set_disconnected,
585 NULL);
586 return;
587 }
588
589 /*
590 * When powering on a bridge from D3cold, the whole hierarchy may be
591 * powered on into D0uninitialized state, resume them to give them a
592 * chance to suspend again
593 */
594 pci_resume_bus(pci_dev->subordinate);
595}
596
597#endif /* CONFIG_PM */
598
599#ifdef CONFIG_PM_SLEEP
600
601/*
602 * Default "suspend" method for devices that have no driver provided suspend,
603 * or not even a driver at all (second part).
604 */
605static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
606{
607 /*
608 * mark its power state as "unknown", since we don't know if
609 * e.g. the BIOS will change its device state when we suspend.
610 */
611 if (pci_dev->current_state == PCI_D0)
612 pci_dev->current_state = PCI_UNKNOWN;
613}
614
615/*
616 * Default "resume" method for devices that have no driver provided resume,
617 * or not even a driver at all (second part).
618 */
619static int pci_pm_reenable_device(struct pci_dev *pci_dev)
620{
621 int retval;
622
623 /* if the device was enabled before suspend, re-enable */
624 retval = pci_reenable_device(pci_dev);
625 /*
626 * if the device was busmaster before the suspend, make it busmaster
627 * again
628 */
629 if (pci_dev->is_busmaster)
630 pci_set_master(pci_dev);
631
632 return retval;
633}
634
635static int pci_legacy_suspend(struct device *dev, pm_message_t state)
636{
637 struct pci_dev *pci_dev = to_pci_dev(dev);
638 struct pci_driver *drv = pci_dev->driver;
639
640 if (drv && drv->suspend) {
641 pci_power_t prev = pci_dev->current_state;
642 int error;
643
644 error = drv->suspend(pci_dev, state);
645 suspend_report_result(dev, drv->suspend, error);
646 if (error)
647 return error;
648
649 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
650 && pci_dev->current_state != PCI_UNKNOWN) {
651 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
652 "PCI PM: Device state not saved by %pS\n",
653 drv->suspend);
654 }
655 }
656
657 pci_fixup_device(pci_fixup_suspend, pci_dev);
658
659 return 0;
660}
661
662static int pci_legacy_suspend_late(struct device *dev)
663{
664 struct pci_dev *pci_dev = to_pci_dev(dev);
665
666 if (!pci_dev->state_saved)
667 pci_save_state(pci_dev);
668
669 pci_pm_set_unknown_state(pci_dev);
670
671 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
672
673 return 0;
674}
675
676static int pci_legacy_resume(struct device *dev)
677{
678 struct pci_dev *pci_dev = to_pci_dev(dev);
679 struct pci_driver *drv = pci_dev->driver;
680
681 pci_fixup_device(pci_fixup_resume, pci_dev);
682
683 return drv && drv->resume ?
684 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
685}
686
687/* Auxiliary functions used by the new power management framework */
688
689static void pci_pm_default_suspend(struct pci_dev *pci_dev)
690{
691 /* Disable non-bridge devices without PM support */
692 if (!pci_has_subordinate(pci_dev))
693 pci_disable_enabled_device(pci_dev);
694}
695
696static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
697{
698 struct pci_driver *drv = pci_dev->driver;
699 bool ret = drv && (drv->suspend || drv->resume);
700
701 /*
702 * Legacy PM support is used by default, so warn if the new framework is
703 * supported as well. Drivers are supposed to support either the
704 * former, or the latter, but not both at the same time.
705 */
706 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
707 pci_dev->vendor, pci_dev->device);
708
709 return ret;
710}
711
712/* New power management framework */
713
714static int pci_pm_prepare(struct device *dev)
715{
716 struct pci_dev *pci_dev = to_pci_dev(dev);
717 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
718
719 if (pm && pm->prepare) {
720 int error = pm->prepare(dev);
721 if (error < 0)
722 return error;
723
724 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
725 return 0;
726 }
727 if (pci_dev_need_resume(pci_dev))
728 return 0;
729
730 /*
731 * The PME setting needs to be adjusted here in case the direct-complete
732 * optimization is used with respect to this device.
733 */
734 pci_dev_adjust_pme(pci_dev);
735 return 1;
736}
737
738static void pci_pm_complete(struct device *dev)
739{
740 struct pci_dev *pci_dev = to_pci_dev(dev);
741
742 pci_dev_complete_resume(pci_dev);
743 pm_generic_complete(dev);
744
745 /* Resume device if platform firmware has put it in reset-power-on */
746 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
747 pci_power_t pre_sleep_state = pci_dev->current_state;
748
749 pci_refresh_power_state(pci_dev);
750 /*
751 * On platforms with ACPI this check may also trigger for
752 * devices sharing power resources if one of those power
753 * resources has been activated as a result of a change of the
754 * power state of another device sharing it. However, in that
755 * case it is also better to resume the device, in general.
756 */
757 if (pci_dev->current_state < pre_sleep_state)
758 pm_request_resume(dev);
759 }
760}
761
762#else /* !CONFIG_PM_SLEEP */
763
764#define pci_pm_prepare NULL
765#define pci_pm_complete NULL
766
767#endif /* !CONFIG_PM_SLEEP */
768
769#ifdef CONFIG_SUSPEND
770static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
771{
772 /*
773 * Some BIOSes forget to clear Root PME Status bits after system
774 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
775 * Clear those bits now just in case (shouldn't hurt).
776 */
777 if (pci_is_pcie(pci_dev) &&
778 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
779 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
780 pcie_clear_root_pme_status(pci_dev);
781}
782
783static int pci_pm_suspend(struct device *dev)
784{
785 struct pci_dev *pci_dev = to_pci_dev(dev);
786 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
787
788 pci_dev->skip_bus_pm = false;
789
790 /*
791 * Disabling PTM allows some systems, e.g., Intel mobile chips
792 * since Coffee Lake, to enter a lower-power PM state.
793 */
794 pci_suspend_ptm(pci_dev);
795
796 if (pci_has_legacy_pm_support(pci_dev))
797 return pci_legacy_suspend(dev, PMSG_SUSPEND);
798
799 if (!pm) {
800 pci_pm_default_suspend(pci_dev);
801 return 0;
802 }
803
804 /*
805 * PCI devices suspended at run time may need to be resumed at this
806 * point, because in general it may be necessary to reconfigure them for
807 * system suspend. Namely, if the device is expected to wake up the
808 * system from the sleep state, it may have to be reconfigured for this
809 * purpose, or if the device is not expected to wake up the system from
810 * the sleep state, it should be prevented from signaling wakeup events
811 * going forward.
812 *
813 * Also if the driver of the device does not indicate that its system
814 * suspend callbacks can cope with runtime-suspended devices, it is
815 * better to resume the device from runtime suspend here.
816 */
817 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
818 pci_dev_need_resume(pci_dev)) {
819 pm_runtime_resume(dev);
820 pci_dev->state_saved = false;
821 } else {
822 pci_dev_adjust_pme(pci_dev);
823 }
824
825 if (pm->suspend) {
826 pci_power_t prev = pci_dev->current_state;
827 int error;
828
829 error = pm->suspend(dev);
830 suspend_report_result(dev, pm->suspend, error);
831 if (error)
832 return error;
833
834 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
835 && pci_dev->current_state != PCI_UNKNOWN) {
836 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
837 "PCI PM: State of device not saved by %pS\n",
838 pm->suspend);
839 }
840 }
841
842 return 0;
843}
844
845static int pci_pm_suspend_late(struct device *dev)
846{
847 if (dev_pm_skip_suspend(dev))
848 return 0;
849
850 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
851
852 return pm_generic_suspend_late(dev);
853}
854
855static int pci_pm_suspend_noirq(struct device *dev)
856{
857 struct pci_dev *pci_dev = to_pci_dev(dev);
858 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
859
860 if (dev_pm_skip_suspend(dev))
861 return 0;
862
863 if (pci_has_legacy_pm_support(pci_dev))
864 return pci_legacy_suspend_late(dev);
865
866 if (!pm) {
867 pci_save_state(pci_dev);
868 goto Fixup;
869 }
870
871 if (pm->suspend_noirq) {
872 pci_power_t prev = pci_dev->current_state;
873 int error;
874
875 error = pm->suspend_noirq(dev);
876 suspend_report_result(dev, pm->suspend_noirq, error);
877 if (error)
878 return error;
879
880 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
881 && pci_dev->current_state != PCI_UNKNOWN) {
882 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
883 "PCI PM: State of device not saved by %pS\n",
884 pm->suspend_noirq);
885 goto Fixup;
886 }
887 }
888
889 if (!pci_dev->state_saved) {
890 pci_save_state(pci_dev);
891
892 /*
893 * If the device is a bridge with a child in D0 below it,
894 * it needs to stay in D0, so check skip_bus_pm to avoid
895 * putting it into a low-power state in that case.
896 */
897 if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
898 pci_prepare_to_sleep(pci_dev);
899 }
900
901 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
902 pci_power_name(pci_dev->current_state));
903
904 if (pci_dev->current_state == PCI_D0) {
905 pci_dev->skip_bus_pm = true;
906 /*
907 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
908 * downstream device is in D0, so avoid changing the power state
909 * of the parent bridge by setting the skip_bus_pm flag for it.
910 */
911 if (pci_dev->bus->self)
912 pci_dev->bus->self->skip_bus_pm = true;
913 }
914
915 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
916 pci_dbg(pci_dev, "PCI PM: Skipped\n");
917 goto Fixup;
918 }
919
920 pci_pm_set_unknown_state(pci_dev);
921
922 /*
923 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
924 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
925 * hasn't been quiesced and tries to turn it off. If the controller
926 * is already in D3, this can hang or cause memory corruption.
927 *
928 * Since the value of the COMMAND register doesn't matter once the
929 * device has been suspended, we can safely set it to 0 here.
930 */
931 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
932 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
933
934Fixup:
935 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
936
937 /*
938 * If the target system sleep state is suspend-to-idle, it is sufficient
939 * to check whether or not the device's wakeup settings are good for
940 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
941 * pci_pm_complete() to take care of fixing up the device's state
942 * anyway, if need be.
943 */
944 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
945 dev->power.may_skip_resume = false;
946
947 return 0;
948}
949
950static int pci_pm_resume_noirq(struct device *dev)
951{
952 struct pci_dev *pci_dev = to_pci_dev(dev);
953 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
954 pci_power_t prev_state = pci_dev->current_state;
955 bool skip_bus_pm = pci_dev->skip_bus_pm;
956
957 if (dev_pm_skip_resume(dev))
958 return 0;
959
960 /*
961 * In the suspend-to-idle case, devices left in D0 during suspend will
962 * stay in D0, so it is not necessary to restore or update their
963 * configuration here and attempting to put them into D0 again is
964 * pointless, so avoid doing that.
965 */
966 if (!(skip_bus_pm && pm_suspend_no_platform()))
967 pci_pm_default_resume_early(pci_dev);
968
969 pci_fixup_device(pci_fixup_resume_early, pci_dev);
970 pcie_pme_root_status_cleanup(pci_dev);
971
972 if (!skip_bus_pm && prev_state == PCI_D3cold)
973 pci_pm_bridge_power_up_actions(pci_dev);
974
975 if (pci_has_legacy_pm_support(pci_dev))
976 return 0;
977
978 if (pm && pm->resume_noirq)
979 return pm->resume_noirq(dev);
980
981 return 0;
982}
983
984static int pci_pm_resume_early(struct device *dev)
985{
986 if (dev_pm_skip_resume(dev))
987 return 0;
988
989 return pm_generic_resume_early(dev);
990}
991
992static int pci_pm_resume(struct device *dev)
993{
994 struct pci_dev *pci_dev = to_pci_dev(dev);
995 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
996
997 /*
998 * This is necessary for the suspend error path in which resume is
999 * called without restoring the standard config registers of the device.
1000 */
1001 if (pci_dev->state_saved)
1002 pci_restore_standard_config(pci_dev);
1003
1004 pci_resume_ptm(pci_dev);
1005
1006 if (pci_has_legacy_pm_support(pci_dev))
1007 return pci_legacy_resume(dev);
1008
1009 pci_pm_default_resume(pci_dev);
1010
1011 if (pm) {
1012 if (pm->resume)
1013 return pm->resume(dev);
1014 } else {
1015 pci_pm_reenable_device(pci_dev);
1016 }
1017
1018 return 0;
1019}
1020
1021#else /* !CONFIG_SUSPEND */
1022
1023#define pci_pm_suspend NULL
1024#define pci_pm_suspend_late NULL
1025#define pci_pm_suspend_noirq NULL
1026#define pci_pm_resume NULL
1027#define pci_pm_resume_early NULL
1028#define pci_pm_resume_noirq NULL
1029
1030#endif /* !CONFIG_SUSPEND */
1031
1032#ifdef CONFIG_HIBERNATE_CALLBACKS
1033
1034static int pci_pm_freeze(struct device *dev)
1035{
1036 struct pci_dev *pci_dev = to_pci_dev(dev);
1037 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1038
1039 if (pci_has_legacy_pm_support(pci_dev))
1040 return pci_legacy_suspend(dev, PMSG_FREEZE);
1041
1042 if (!pm) {
1043 pci_pm_default_suspend(pci_dev);
1044 return 0;
1045 }
1046
1047 /*
1048 * Resume all runtime-suspended devices before creating a snapshot
1049 * image of system memory, because the restore kernel generally cannot
1050 * be expected to always handle them consistently and they need to be
1051 * put into the runtime-active metastate during system resume anyway,
1052 * so it is better to ensure that the state saved in the image will be
1053 * always consistent with that.
1054 */
1055 pm_runtime_resume(dev);
1056 pci_dev->state_saved = false;
1057
1058 if (pm->freeze) {
1059 int error;
1060
1061 error = pm->freeze(dev);
1062 suspend_report_result(dev, pm->freeze, error);
1063 if (error)
1064 return error;
1065 }
1066
1067 return 0;
1068}
1069
1070static int pci_pm_freeze_noirq(struct device *dev)
1071{
1072 struct pci_dev *pci_dev = to_pci_dev(dev);
1073 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1074
1075 if (pci_has_legacy_pm_support(pci_dev))
1076 return pci_legacy_suspend_late(dev);
1077
1078 if (pm && pm->freeze_noirq) {
1079 int error;
1080
1081 error = pm->freeze_noirq(dev);
1082 suspend_report_result(dev, pm->freeze_noirq, error);
1083 if (error)
1084 return error;
1085 }
1086
1087 if (!pci_dev->state_saved)
1088 pci_save_state(pci_dev);
1089
1090 pci_pm_set_unknown_state(pci_dev);
1091
1092 return 0;
1093}
1094
1095static int pci_pm_thaw_noirq(struct device *dev)
1096{
1097 struct pci_dev *pci_dev = to_pci_dev(dev);
1098 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1099
1100 /*
1101 * The pm->thaw_noirq() callback assumes the device has been
1102 * returned to D0 and its config state has been restored.
1103 *
1104 * In addition, pci_restore_state() restores MSI-X state in MMIO
1105 * space, which requires the device to be in D0, so return it to D0
1106 * in case the driver's "freeze" callbacks put it into a low-power
1107 * state.
1108 */
1109 pci_pm_power_up_and_verify_state(pci_dev);
1110 pci_restore_state(pci_dev);
1111
1112 if (pci_has_legacy_pm_support(pci_dev))
1113 return 0;
1114
1115 if (pm && pm->thaw_noirq)
1116 return pm->thaw_noirq(dev);
1117
1118 return 0;
1119}
1120
1121static int pci_pm_thaw(struct device *dev)
1122{
1123 struct pci_dev *pci_dev = to_pci_dev(dev);
1124 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1125 int error = 0;
1126
1127 if (pci_has_legacy_pm_support(pci_dev))
1128 return pci_legacy_resume(dev);
1129
1130 if (pm) {
1131 if (pm->thaw)
1132 error = pm->thaw(dev);
1133 } else {
1134 pci_pm_reenable_device(pci_dev);
1135 }
1136
1137 pci_dev->state_saved = false;
1138
1139 return error;
1140}
1141
1142static int pci_pm_poweroff(struct device *dev)
1143{
1144 struct pci_dev *pci_dev = to_pci_dev(dev);
1145 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1146
1147 if (pci_has_legacy_pm_support(pci_dev))
1148 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1149
1150 if (!pm) {
1151 pci_pm_default_suspend(pci_dev);
1152 return 0;
1153 }
1154
1155 /* The reason to do that is the same as in pci_pm_suspend(). */
1156 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1157 pci_dev_need_resume(pci_dev)) {
1158 pm_runtime_resume(dev);
1159 pci_dev->state_saved = false;
1160 } else {
1161 pci_dev_adjust_pme(pci_dev);
1162 }
1163
1164 if (pm->poweroff) {
1165 int error;
1166
1167 error = pm->poweroff(dev);
1168 suspend_report_result(dev, pm->poweroff, error);
1169 if (error)
1170 return error;
1171 }
1172
1173 return 0;
1174}
1175
1176static int pci_pm_poweroff_late(struct device *dev)
1177{
1178 if (dev_pm_skip_suspend(dev))
1179 return 0;
1180
1181 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1182
1183 return pm_generic_poweroff_late(dev);
1184}
1185
1186static int pci_pm_poweroff_noirq(struct device *dev)
1187{
1188 struct pci_dev *pci_dev = to_pci_dev(dev);
1189 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1190
1191 if (dev_pm_skip_suspend(dev))
1192 return 0;
1193
1194 if (pci_has_legacy_pm_support(pci_dev))
1195 return pci_legacy_suspend_late(dev);
1196
1197 if (!pm) {
1198 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1199 return 0;
1200 }
1201
1202 if (pm->poweroff_noirq) {
1203 int error;
1204
1205 error = pm->poweroff_noirq(dev);
1206 suspend_report_result(dev, pm->poweroff_noirq, error);
1207 if (error)
1208 return error;
1209 }
1210
1211 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1212 pci_prepare_to_sleep(pci_dev);
1213
1214 /*
1215 * The reason for doing this here is the same as for the analogous code
1216 * in pci_pm_suspend_noirq().
1217 */
1218 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1219 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1220
1221 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1222
1223 return 0;
1224}
1225
1226static int pci_pm_restore_noirq(struct device *dev)
1227{
1228 struct pci_dev *pci_dev = to_pci_dev(dev);
1229 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1230
1231 pci_pm_default_resume_early(pci_dev);
1232 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1233
1234 if (pci_has_legacy_pm_support(pci_dev))
1235 return 0;
1236
1237 if (pm && pm->restore_noirq)
1238 return pm->restore_noirq(dev);
1239
1240 return 0;
1241}
1242
1243static int pci_pm_restore(struct device *dev)
1244{
1245 struct pci_dev *pci_dev = to_pci_dev(dev);
1246 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1247
1248 /*
1249 * This is necessary for the hibernation error path in which restore is
1250 * called without restoring the standard config registers of the device.
1251 */
1252 if (pci_dev->state_saved)
1253 pci_restore_standard_config(pci_dev);
1254
1255 if (pci_has_legacy_pm_support(pci_dev))
1256 return pci_legacy_resume(dev);
1257
1258 pci_pm_default_resume(pci_dev);
1259
1260 if (pm) {
1261 if (pm->restore)
1262 return pm->restore(dev);
1263 } else {
1264 pci_pm_reenable_device(pci_dev);
1265 }
1266
1267 return 0;
1268}
1269
1270#else /* !CONFIG_HIBERNATE_CALLBACKS */
1271
1272#define pci_pm_freeze NULL
1273#define pci_pm_freeze_noirq NULL
1274#define pci_pm_thaw NULL
1275#define pci_pm_thaw_noirq NULL
1276#define pci_pm_poweroff NULL
1277#define pci_pm_poweroff_late NULL
1278#define pci_pm_poweroff_noirq NULL
1279#define pci_pm_restore NULL
1280#define pci_pm_restore_noirq NULL
1281
1282#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1283
1284#ifdef CONFIG_PM
1285
1286static int pci_pm_runtime_suspend(struct device *dev)
1287{
1288 struct pci_dev *pci_dev = to_pci_dev(dev);
1289 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1290 pci_power_t prev = pci_dev->current_state;
1291 int error;
1292
1293 pci_suspend_ptm(pci_dev);
1294
1295 /*
1296 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1297 * but it may go to D3cold when the bridge above it runtime suspends.
1298 * Save its config space in case that happens.
1299 */
1300 if (!pci_dev->driver) {
1301 pci_save_state(pci_dev);
1302 return 0;
1303 }
1304
1305 pci_dev->state_saved = false;
1306 if (pm && pm->runtime_suspend) {
1307 error = pm->runtime_suspend(dev);
1308 /*
1309 * -EBUSY and -EAGAIN is used to request the runtime PM core
1310 * to schedule a new suspend, so log the event only with debug
1311 * log level.
1312 */
1313 if (error == -EBUSY || error == -EAGAIN) {
1314 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1315 pm->runtime_suspend, error);
1316 return error;
1317 } else if (error) {
1318 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1319 pm->runtime_suspend, error);
1320 return error;
1321 }
1322 }
1323
1324 pci_fixup_device(pci_fixup_suspend, pci_dev);
1325
1326 if (pm && pm->runtime_suspend
1327 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1328 && pci_dev->current_state != PCI_UNKNOWN) {
1329 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1330 "PCI PM: State of device not saved by %pS\n",
1331 pm->runtime_suspend);
1332 return 0;
1333 }
1334
1335 if (!pci_dev->state_saved) {
1336 pci_save_state(pci_dev);
1337 pci_finish_runtime_suspend(pci_dev);
1338 }
1339
1340 return 0;
1341}
1342
1343static int pci_pm_runtime_resume(struct device *dev)
1344{
1345 struct pci_dev *pci_dev = to_pci_dev(dev);
1346 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1347 pci_power_t prev_state = pci_dev->current_state;
1348 int error = 0;
1349
1350 /*
1351 * Restoring config space is necessary even if the device is not bound
1352 * to a driver because although we left it in D0, it may have gone to
1353 * D3cold when the bridge above it runtime suspended.
1354 */
1355 pci_pm_default_resume_early(pci_dev);
1356 pci_resume_ptm(pci_dev);
1357
1358 if (!pci_dev->driver)
1359 return 0;
1360
1361 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1362 pci_pm_default_resume(pci_dev);
1363
1364 if (prev_state == PCI_D3cold)
1365 pci_pm_bridge_power_up_actions(pci_dev);
1366
1367 if (pm && pm->runtime_resume)
1368 error = pm->runtime_resume(dev);
1369
1370 return error;
1371}
1372
1373static int pci_pm_runtime_idle(struct device *dev)
1374{
1375 struct pci_dev *pci_dev = to_pci_dev(dev);
1376 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1377
1378 /*
1379 * If pci_dev->driver is not set (unbound), the device should
1380 * always remain in D0 regardless of the runtime PM status
1381 */
1382 if (!pci_dev->driver)
1383 return 0;
1384
1385 if (!pm)
1386 return -ENOSYS;
1387
1388 if (pm->runtime_idle)
1389 return pm->runtime_idle(dev);
1390
1391 return 0;
1392}
1393
1394static const struct dev_pm_ops pci_dev_pm_ops = {
1395 .prepare = pci_pm_prepare,
1396 .complete = pci_pm_complete,
1397 .suspend = pci_pm_suspend,
1398 .suspend_late = pci_pm_suspend_late,
1399 .resume = pci_pm_resume,
1400 .resume_early = pci_pm_resume_early,
1401 .freeze = pci_pm_freeze,
1402 .thaw = pci_pm_thaw,
1403 .poweroff = pci_pm_poweroff,
1404 .poweroff_late = pci_pm_poweroff_late,
1405 .restore = pci_pm_restore,
1406 .suspend_noirq = pci_pm_suspend_noirq,
1407 .resume_noirq = pci_pm_resume_noirq,
1408 .freeze_noirq = pci_pm_freeze_noirq,
1409 .thaw_noirq = pci_pm_thaw_noirq,
1410 .poweroff_noirq = pci_pm_poweroff_noirq,
1411 .restore_noirq = pci_pm_restore_noirq,
1412 .runtime_suspend = pci_pm_runtime_suspend,
1413 .runtime_resume = pci_pm_runtime_resume,
1414 .runtime_idle = pci_pm_runtime_idle,
1415};
1416
1417#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1418
1419#else /* !CONFIG_PM */
1420
1421#define pci_pm_runtime_suspend NULL
1422#define pci_pm_runtime_resume NULL
1423#define pci_pm_runtime_idle NULL
1424
1425#define PCI_PM_OPS_PTR NULL
1426
1427#endif /* !CONFIG_PM */
1428
1429/**
1430 * __pci_register_driver - register a new pci driver
1431 * @drv: the driver structure to register
1432 * @owner: owner module of drv
1433 * @mod_name: module name string
1434 *
1435 * Adds the driver structure to the list of registered drivers.
1436 * Returns a negative value on error, otherwise 0.
1437 * If no error occurred, the driver remains registered even if
1438 * no device was claimed during registration.
1439 */
1440int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1441 const char *mod_name)
1442{
1443 /* initialize common driver fields */
1444 drv->driver.name = drv->name;
1445 drv->driver.bus = &pci_bus_type;
1446 drv->driver.owner = owner;
1447 drv->driver.mod_name = mod_name;
1448 drv->driver.groups = drv->groups;
1449 drv->driver.dev_groups = drv->dev_groups;
1450
1451 spin_lock_init(&drv->dynids.lock);
1452 INIT_LIST_HEAD(&drv->dynids.list);
1453
1454 /* register with core */
1455 return driver_register(&drv->driver);
1456}
1457EXPORT_SYMBOL(__pci_register_driver);
1458
1459/**
1460 * pci_unregister_driver - unregister a pci driver
1461 * @drv: the driver structure to unregister
1462 *
1463 * Deletes the driver structure from the list of registered PCI drivers,
1464 * gives it a chance to clean up by calling its remove() function for
1465 * each device it was responsible for, and marks those devices as
1466 * driverless.
1467 */
1468
1469void pci_unregister_driver(struct pci_driver *drv)
1470{
1471 driver_unregister(&drv->driver);
1472 pci_free_dynids(drv);
1473}
1474EXPORT_SYMBOL(pci_unregister_driver);
1475
1476static struct pci_driver pci_compat_driver = {
1477 .name = "compat"
1478};
1479
1480/**
1481 * pci_dev_driver - get the pci_driver of a device
1482 * @dev: the device to query
1483 *
1484 * Returns the appropriate pci_driver structure or %NULL if there is no
1485 * registered driver for the device.
1486 */
1487struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1488{
1489 int i;
1490
1491 if (dev->driver)
1492 return dev->driver;
1493
1494 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1495 if (dev->resource[i].flags & IORESOURCE_BUSY)
1496 return &pci_compat_driver;
1497
1498 return NULL;
1499}
1500EXPORT_SYMBOL(pci_dev_driver);
1501
1502/**
1503 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1504 * @dev: the PCI device structure to match against
1505 * @drv: the device driver to search for matching PCI device id structures
1506 *
1507 * Used by a driver to check whether a PCI device present in the
1508 * system is in its list of supported devices. Returns the matching
1509 * pci_device_id structure or %NULL if there is no match.
1510 */
1511static int pci_bus_match(struct device *dev, struct device_driver *drv)
1512{
1513 struct pci_dev *pci_dev = to_pci_dev(dev);
1514 struct pci_driver *pci_drv;
1515 const struct pci_device_id *found_id;
1516
1517 if (!pci_dev->match_driver)
1518 return 0;
1519
1520 pci_drv = to_pci_driver(drv);
1521 found_id = pci_match_device(pci_drv, pci_dev);
1522 if (found_id)
1523 return 1;
1524
1525 return 0;
1526}
1527
1528/**
1529 * pci_dev_get - increments the reference count of the pci device structure
1530 * @dev: the device being referenced
1531 *
1532 * Each live reference to a device should be refcounted.
1533 *
1534 * Drivers for PCI devices should normally record such references in
1535 * their probe() methods, when they bind to a device, and release
1536 * them by calling pci_dev_put(), in their disconnect() methods.
1537 *
1538 * A pointer to the device with the incremented reference counter is returned.
1539 */
1540struct pci_dev *pci_dev_get(struct pci_dev *dev)
1541{
1542 if (dev)
1543 get_device(&dev->dev);
1544 return dev;
1545}
1546EXPORT_SYMBOL(pci_dev_get);
1547
1548/**
1549 * pci_dev_put - release a use of the pci device structure
1550 * @dev: device that's been disconnected
1551 *
1552 * Must be called when a user of a device is finished with it. When the last
1553 * user of the device calls this function, the memory of the device is freed.
1554 */
1555void pci_dev_put(struct pci_dev *dev)
1556{
1557 if (dev)
1558 put_device(&dev->dev);
1559}
1560EXPORT_SYMBOL(pci_dev_put);
1561
1562static int pci_uevent(const struct device *dev, struct kobj_uevent_env *env)
1563{
1564 const struct pci_dev *pdev;
1565
1566 if (!dev)
1567 return -ENODEV;
1568
1569 pdev = to_pci_dev(dev);
1570
1571 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1572 return -ENOMEM;
1573
1574 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1575 return -ENOMEM;
1576
1577 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1578 pdev->subsystem_device))
1579 return -ENOMEM;
1580
1581 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1582 return -ENOMEM;
1583
1584 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1585 pdev->vendor, pdev->device,
1586 pdev->subsystem_vendor, pdev->subsystem_device,
1587 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1588 (u8)(pdev->class)))
1589 return -ENOMEM;
1590
1591 return 0;
1592}
1593
1594#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1595/**
1596 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1597 * @pdev: PCI device undergoing error recovery
1598 * @err_type: type of error event
1599 */
1600void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1601{
1602 int idx = 0;
1603 char *envp[3];
1604
1605 switch (err_type) {
1606 case PCI_ERS_RESULT_NONE:
1607 case PCI_ERS_RESULT_CAN_RECOVER:
1608 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1609 envp[idx++] = "DEVICE_ONLINE=0";
1610 break;
1611 case PCI_ERS_RESULT_RECOVERED:
1612 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1613 envp[idx++] = "DEVICE_ONLINE=1";
1614 break;
1615 case PCI_ERS_RESULT_DISCONNECT:
1616 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1617 envp[idx++] = "DEVICE_ONLINE=0";
1618 break;
1619 default:
1620 break;
1621 }
1622
1623 if (idx > 0) {
1624 envp[idx++] = NULL;
1625 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1626 }
1627}
1628#endif
1629
1630static int pci_bus_num_vf(struct device *dev)
1631{
1632 return pci_num_vf(to_pci_dev(dev));
1633}
1634
1635/**
1636 * pci_dma_configure - Setup DMA configuration
1637 * @dev: ptr to dev structure
1638 *
1639 * Function to update PCI devices's DMA configuration using the same
1640 * info from the OF node or ACPI node of host bridge's parent (if any).
1641 */
1642static int pci_dma_configure(struct device *dev)
1643{
1644 struct pci_driver *driver = to_pci_driver(dev->driver);
1645 struct device *bridge;
1646 int ret = 0;
1647
1648 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1649
1650 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1651 bridge->parent->of_node) {
1652 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1653 } else if (has_acpi_companion(bridge)) {
1654 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1655
1656 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1657 }
1658
1659 pci_put_host_bridge_device(bridge);
1660
1661 if (!ret && !driver->driver_managed_dma) {
1662 ret = iommu_device_use_default_domain(dev);
1663 if (ret)
1664 arch_teardown_dma_ops(dev);
1665 }
1666
1667 return ret;
1668}
1669
1670static void pci_dma_cleanup(struct device *dev)
1671{
1672 struct pci_driver *driver = to_pci_driver(dev->driver);
1673
1674 if (!driver->driver_managed_dma)
1675 iommu_device_unuse_default_domain(dev);
1676}
1677
1678struct bus_type pci_bus_type = {
1679 .name = "pci",
1680 .match = pci_bus_match,
1681 .uevent = pci_uevent,
1682 .probe = pci_device_probe,
1683 .remove = pci_device_remove,
1684 .shutdown = pci_device_shutdown,
1685 .dev_groups = pci_dev_groups,
1686 .bus_groups = pci_bus_groups,
1687 .drv_groups = pci_drv_groups,
1688 .pm = PCI_PM_OPS_PTR,
1689 .num_vf = pci_bus_num_vf,
1690 .dma_configure = pci_dma_configure,
1691 .dma_cleanup = pci_dma_cleanup,
1692};
1693EXPORT_SYMBOL(pci_bus_type);
1694
1695#ifdef CONFIG_PCIEPORTBUS
1696static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1697{
1698 struct pcie_device *pciedev;
1699 struct pcie_port_service_driver *driver;
1700
1701 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1702 return 0;
1703
1704 pciedev = to_pcie_device(dev);
1705 driver = to_service_driver(drv);
1706
1707 if (driver->service != pciedev->service)
1708 return 0;
1709
1710 if (driver->port_type != PCIE_ANY_PORT &&
1711 driver->port_type != pci_pcie_type(pciedev->port))
1712 return 0;
1713
1714 return 1;
1715}
1716
1717struct bus_type pcie_port_bus_type = {
1718 .name = "pci_express",
1719 .match = pcie_port_bus_match,
1720};
1721#endif
1722
1723static int __init pci_driver_init(void)
1724{
1725 int ret;
1726
1727 ret = bus_register(&pci_bus_type);
1728 if (ret)
1729 return ret;
1730
1731#ifdef CONFIG_PCIEPORTBUS
1732 ret = bus_register(&pcie_port_bus_type);
1733 if (ret)
1734 return ret;
1735#endif
1736 dma_debug_add_bus(&pci_bus_type);
1737 return 0;
1738}
1739postcore_initcall(pci_driver_init);