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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/*
2 * drivers/pci/pci-driver.c
3 *
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
6 *
7 * Released under the GPL v2 only.
8 *
9 */
10
11#include <linux/pci.h>
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/device.h>
15#include <linux/mempolicy.h>
16#include <linux/string.h>
17#include <linux/slab.h>
18#include <linux/sched.h>
19#include <linux/cpu.h>
20#include <linux/pm_runtime.h>
21#include <linux/suspend.h>
22#include <linux/kexec.h>
23#include "pci.h"
24
25struct pci_dynid {
26 struct list_head node;
27 struct pci_device_id id;
28};
29
30/**
31 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
32 * @drv: target pci driver
33 * @vendor: PCI vendor ID
34 * @device: PCI device ID
35 * @subvendor: PCI subvendor ID
36 * @subdevice: PCI subdevice ID
37 * @class: PCI class
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
40 *
41 * Adds a new dynamic pci device ID to this driver and causes the
42 * driver to probe for all devices again. @drv must have been
43 * registered prior to calling this function.
44 *
45 * CONTEXT:
46 * Does GFP_KERNEL allocation.
47 *
48 * RETURNS:
49 * 0 on success, -errno on failure.
50 */
51int pci_add_dynid(struct pci_driver *drv,
52 unsigned int vendor, unsigned int device,
53 unsigned int subvendor, unsigned int subdevice,
54 unsigned int class, unsigned int class_mask,
55 unsigned long driver_data)
56{
57 struct pci_dynid *dynid;
58 int retval;
59
60 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
61 if (!dynid)
62 return -ENOMEM;
63
64 dynid->id.vendor = vendor;
65 dynid->id.device = device;
66 dynid->id.subvendor = subvendor;
67 dynid->id.subdevice = subdevice;
68 dynid->id.class = class;
69 dynid->id.class_mask = class_mask;
70 dynid->id.driver_data = driver_data;
71
72 spin_lock(&drv->dynids.lock);
73 list_add_tail(&dynid->node, &drv->dynids.list);
74 spin_unlock(&drv->dynids.lock);
75
76 retval = driver_attach(&drv->driver);
77
78 return retval;
79}
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 * store_new_id - sysfs frontend to pci_add_dynid()
95 * @driver: target device driver
96 * @buf: buffer for scanning device ID data
97 * @count: input size
98 *
99 * Allow PCI IDs to be added to an existing driver via sysfs.
100 */
101static ssize_t
102store_new_id(struct device_driver *driver, const char *buf, size_t count)
103{
104 struct pci_driver *pdrv = to_pci_driver(driver);
105 const struct pci_device_id *ids = pdrv->id_table;
106 __u32 vendor, device, subvendor=PCI_ANY_ID,
107 subdevice=PCI_ANY_ID, class=0, class_mask=0;
108 unsigned long driver_data=0;
109 int fields=0;
110 int retval;
111
112 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
113 &vendor, &device, &subvendor, &subdevice,
114 &class, &class_mask, &driver_data);
115 if (fields < 2)
116 return -EINVAL;
117
118 /* Only accept driver_data values that match an existing id_table
119 entry */
120 if (ids) {
121 retval = -EINVAL;
122 while (ids->vendor || ids->subvendor || ids->class_mask) {
123 if (driver_data == ids->driver_data) {
124 retval = 0;
125 break;
126 }
127 ids++;
128 }
129 if (retval) /* No match */
130 return retval;
131 }
132
133 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
134 class, class_mask, driver_data);
135 if (retval)
136 return retval;
137 return count;
138}
139static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
140
141/**
142 * store_remove_id - remove a PCI device ID from this driver
143 * @driver: target device driver
144 * @buf: buffer for scanning device ID data
145 * @count: input size
146 *
147 * Removes a dynamic pci device ID to this driver.
148 */
149static ssize_t
150store_remove_id(struct device_driver *driver, const char *buf, size_t count)
151{
152 struct pci_dynid *dynid, *n;
153 struct pci_driver *pdrv = to_pci_driver(driver);
154 __u32 vendor, device, subvendor = PCI_ANY_ID,
155 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
156 int fields = 0;
157 int retval = -ENODEV;
158
159 fields = sscanf(buf, "%x %x %x %x %x %x",
160 &vendor, &device, &subvendor, &subdevice,
161 &class, &class_mask);
162 if (fields < 2)
163 return -EINVAL;
164
165 spin_lock(&pdrv->dynids.lock);
166 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
167 struct pci_device_id *id = &dynid->id;
168 if ((id->vendor == vendor) &&
169 (id->device == device) &&
170 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
171 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
172 !((id->class ^ class) & class_mask)) {
173 list_del(&dynid->node);
174 kfree(dynid);
175 retval = 0;
176 break;
177 }
178 }
179 spin_unlock(&pdrv->dynids.lock);
180
181 if (retval)
182 return retval;
183 return count;
184}
185static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
186
187static struct attribute *pci_drv_attrs[] = {
188 &driver_attr_new_id.attr,
189 &driver_attr_remove_id.attr,
190 NULL,
191};
192ATTRIBUTE_GROUPS(pci_drv);
193
194/**
195 * pci_match_id - See if a pci device matches a given pci_id table
196 * @ids: array of PCI device id structures to search in
197 * @dev: the PCI device structure to match against.
198 *
199 * Used by a driver to check whether a PCI device present in the
200 * system is in its list of supported devices. Returns the matching
201 * pci_device_id structure or %NULL if there is no match.
202 *
203 * Deprecated, don't use this as it will not catch any dynamic ids
204 * that a driver might want to check for.
205 */
206const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
207 struct pci_dev *dev)
208{
209 if (ids) {
210 while (ids->vendor || ids->subvendor || ids->class_mask) {
211 if (pci_match_one_device(ids, dev))
212 return ids;
213 ids++;
214 }
215 }
216 return NULL;
217}
218
219/**
220 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
221 * @drv: the PCI driver to match against
222 * @dev: the PCI device structure to match against
223 *
224 * Used by a driver to check whether a PCI device present in the
225 * system is in its list of supported devices. Returns the matching
226 * pci_device_id structure or %NULL if there is no match.
227 */
228static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
229 struct pci_dev *dev)
230{
231 struct pci_dynid *dynid;
232
233 /* Look at the dynamic ids first, before the static ones */
234 spin_lock(&drv->dynids.lock);
235 list_for_each_entry(dynid, &drv->dynids.list, node) {
236 if (pci_match_one_device(&dynid->id, dev)) {
237 spin_unlock(&drv->dynids.lock);
238 return &dynid->id;
239 }
240 }
241 spin_unlock(&drv->dynids.lock);
242
243 return pci_match_id(drv->id_table, dev);
244}
245
246struct drv_dev_and_id {
247 struct pci_driver *drv;
248 struct pci_dev *dev;
249 const struct pci_device_id *id;
250};
251
252static long local_pci_probe(void *_ddi)
253{
254 struct drv_dev_and_id *ddi = _ddi;
255 struct pci_dev *pci_dev = ddi->dev;
256 struct pci_driver *pci_drv = ddi->drv;
257 struct device *dev = &pci_dev->dev;
258 int rc;
259
260 /*
261 * Unbound PCI devices are always put in D0, regardless of
262 * runtime PM status. During probe, the device is set to
263 * active and the usage count is incremented. If the driver
264 * supports runtime PM, it should call pm_runtime_put_noidle()
265 * in its probe routine and pm_runtime_get_noresume() in its
266 * remove routine.
267 */
268 pm_runtime_get_sync(dev);
269 pci_dev->driver = pci_drv;
270 rc = pci_drv->probe(pci_dev, ddi->id);
271 if (!rc)
272 return rc;
273 if (rc < 0) {
274 pci_dev->driver = NULL;
275 pm_runtime_put_sync(dev);
276 return rc;
277 }
278 /*
279 * Probe function should return < 0 for failure, 0 for success
280 * Treat values > 0 as success, but warn.
281 */
282 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
283 return 0;
284}
285
286static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
287 const struct pci_device_id *id)
288{
289 int error, node;
290 struct drv_dev_and_id ddi = { drv, dev, id };
291
292 /*
293 * Execute driver initialization on node where the device is
294 * attached. This way the driver likely allocates its local memory
295 * on the right node.
296 */
297 node = dev_to_node(&dev->dev);
298
299 /*
300 * On NUMA systems, we are likely to call a PF probe function using
301 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
302 * adds the VF devices via pci_bus_add_device()), we may re-enter
303 * this function to call the VF probe function. Calling
304 * work_on_cpu() again will cause a lockdep warning. Since VFs are
305 * always on the same node as the PF, we can work around this by
306 * avoiding work_on_cpu() when we're already on the correct node.
307 *
308 * Preemption is enabled, so it's theoretically unsafe to use
309 * numa_node_id(), but even if we run the probe function on the
310 * wrong node, it should be functionally correct.
311 */
312 if (node >= 0 && node != numa_node_id()) {
313 int cpu;
314
315 get_online_cpus();
316 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
317 if (cpu < nr_cpu_ids)
318 error = work_on_cpu(cpu, local_pci_probe, &ddi);
319 else
320 error = local_pci_probe(&ddi);
321 put_online_cpus();
322 } else
323 error = local_pci_probe(&ddi);
324
325 return error;
326}
327
328/**
329 * __pci_device_probe - check if a driver wants to claim a specific PCI device
330 * @drv: driver to call to check if it wants the PCI device
331 * @pci_dev: PCI device being probed
332 *
333 * returns 0 on success, else error.
334 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
335 */
336static int
337__pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
338{
339 const struct pci_device_id *id;
340 int error = 0;
341
342 if (!pci_dev->driver && drv->probe) {
343 error = -ENODEV;
344
345 id = pci_match_device(drv, pci_dev);
346 if (id)
347 error = pci_call_probe(drv, pci_dev, id);
348 if (error >= 0)
349 error = 0;
350 }
351 return error;
352}
353
354static int pci_device_probe(struct device * dev)
355{
356 int error = 0;
357 struct pci_driver *drv;
358 struct pci_dev *pci_dev;
359
360 drv = to_pci_driver(dev->driver);
361 pci_dev = to_pci_dev(dev);
362 pci_dev_get(pci_dev);
363 error = __pci_device_probe(drv, pci_dev);
364 if (error)
365 pci_dev_put(pci_dev);
366
367 return error;
368}
369
370static int pci_device_remove(struct device * dev)
371{
372 struct pci_dev * pci_dev = to_pci_dev(dev);
373 struct pci_driver * drv = pci_dev->driver;
374
375 if (drv) {
376 if (drv->remove) {
377 pm_runtime_get_sync(dev);
378 drv->remove(pci_dev);
379 pm_runtime_put_noidle(dev);
380 }
381 pci_dev->driver = NULL;
382 }
383
384 /* Undo the runtime PM settings in local_pci_probe() */
385 pm_runtime_put_sync(dev);
386
387 /*
388 * If the device is still on, set the power state as "unknown",
389 * since it might change by the next time we load the driver.
390 */
391 if (pci_dev->current_state == PCI_D0)
392 pci_dev->current_state = PCI_UNKNOWN;
393
394 /*
395 * We would love to complain here if pci_dev->is_enabled is set, that
396 * the driver should have called pci_disable_device(), but the
397 * unfortunate fact is there are too many odd BIOS and bridge setups
398 * that don't like drivers doing that all of the time.
399 * Oh well, we can dream of sane hardware when we sleep, no matter how
400 * horrible the crap we have to deal with is when we are awake...
401 */
402
403 pci_dev_put(pci_dev);
404 return 0;
405}
406
407static void pci_device_shutdown(struct device *dev)
408{
409 struct pci_dev *pci_dev = to_pci_dev(dev);
410 struct pci_driver *drv = pci_dev->driver;
411
412 pm_runtime_resume(dev);
413
414 if (drv && drv->shutdown)
415 drv->shutdown(pci_dev);
416 pci_msi_shutdown(pci_dev);
417 pci_msix_shutdown(pci_dev);
418
419#ifdef CONFIG_KEXEC
420 /*
421 * If this is a kexec reboot, turn off Bus Master bit on the
422 * device to tell it to not continue to do DMA. Don't touch
423 * devices in D3cold or unknown states.
424 * If it is not a kexec reboot, firmware will hit the PCI
425 * devices with big hammer and stop their DMA any way.
426 */
427 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
428 pci_clear_master(pci_dev);
429#endif
430}
431
432#ifdef CONFIG_PM
433
434/* Auxiliary functions used for system resume and run-time resume. */
435
436/**
437 * pci_restore_standard_config - restore standard config registers of PCI device
438 * @pci_dev: PCI device to handle
439 */
440static int pci_restore_standard_config(struct pci_dev *pci_dev)
441{
442 pci_update_current_state(pci_dev, PCI_UNKNOWN);
443
444 if (pci_dev->current_state != PCI_D0) {
445 int error = pci_set_power_state(pci_dev, PCI_D0);
446 if (error)
447 return error;
448 }
449
450 pci_restore_state(pci_dev);
451 return 0;
452}
453
454#endif
455
456#ifdef CONFIG_PM_SLEEP
457
458static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
459{
460 pci_power_up(pci_dev);
461 pci_restore_state(pci_dev);
462 pci_fixup_device(pci_fixup_resume_early, pci_dev);
463}
464
465/*
466 * Default "suspend" method for devices that have no driver provided suspend,
467 * or not even a driver at all (second part).
468 */
469static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
470{
471 /*
472 * mark its power state as "unknown", since we don't know if
473 * e.g. the BIOS will change its device state when we suspend.
474 */
475 if (pci_dev->current_state == PCI_D0)
476 pci_dev->current_state = PCI_UNKNOWN;
477}
478
479/*
480 * Default "resume" method for devices that have no driver provided resume,
481 * or not even a driver at all (second part).
482 */
483static int pci_pm_reenable_device(struct pci_dev *pci_dev)
484{
485 int retval;
486
487 /* if the device was enabled before suspend, reenable */
488 retval = pci_reenable_device(pci_dev);
489 /*
490 * if the device was busmaster before the suspend, make it busmaster
491 * again
492 */
493 if (pci_dev->is_busmaster)
494 pci_set_master(pci_dev);
495
496 return retval;
497}
498
499static int pci_legacy_suspend(struct device *dev, pm_message_t state)
500{
501 struct pci_dev * pci_dev = to_pci_dev(dev);
502 struct pci_driver * drv = pci_dev->driver;
503
504 if (drv && drv->suspend) {
505 pci_power_t prev = pci_dev->current_state;
506 int error;
507
508 error = drv->suspend(pci_dev, state);
509 suspend_report_result(drv->suspend, error);
510 if (error)
511 return error;
512
513 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
514 && pci_dev->current_state != PCI_UNKNOWN) {
515 WARN_ONCE(pci_dev->current_state != prev,
516 "PCI PM: Device state not saved by %pF\n",
517 drv->suspend);
518 }
519 }
520
521 pci_fixup_device(pci_fixup_suspend, pci_dev);
522
523 return 0;
524}
525
526static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
527{
528 struct pci_dev * pci_dev = to_pci_dev(dev);
529 struct pci_driver * drv = pci_dev->driver;
530
531 if (drv && drv->suspend_late) {
532 pci_power_t prev = pci_dev->current_state;
533 int error;
534
535 error = drv->suspend_late(pci_dev, state);
536 suspend_report_result(drv->suspend_late, error);
537 if (error)
538 return error;
539
540 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
541 && pci_dev->current_state != PCI_UNKNOWN) {
542 WARN_ONCE(pci_dev->current_state != prev,
543 "PCI PM: Device state not saved by %pF\n",
544 drv->suspend_late);
545 return 0;
546 }
547 }
548
549 if (!pci_dev->state_saved)
550 pci_save_state(pci_dev);
551
552 pci_pm_set_unknown_state(pci_dev);
553
554 return 0;
555}
556
557static int pci_legacy_resume_early(struct device *dev)
558{
559 struct pci_dev * pci_dev = to_pci_dev(dev);
560 struct pci_driver * drv = pci_dev->driver;
561
562 return drv && drv->resume_early ?
563 drv->resume_early(pci_dev) : 0;
564}
565
566static int pci_legacy_resume(struct device *dev)
567{
568 struct pci_dev * pci_dev = to_pci_dev(dev);
569 struct pci_driver * drv = pci_dev->driver;
570
571 pci_fixup_device(pci_fixup_resume, pci_dev);
572
573 return drv && drv->resume ?
574 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
575}
576
577/* Auxiliary functions used by the new power management framework */
578
579static void pci_pm_default_resume(struct pci_dev *pci_dev)
580{
581 pci_fixup_device(pci_fixup_resume, pci_dev);
582
583 if (!pci_is_bridge(pci_dev))
584 pci_enable_wake(pci_dev, PCI_D0, false);
585}
586
587static void pci_pm_default_suspend(struct pci_dev *pci_dev)
588{
589 /* Disable non-bridge devices without PM support */
590 if (!pci_is_bridge(pci_dev))
591 pci_disable_enabled_device(pci_dev);
592}
593
594static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
595{
596 struct pci_driver *drv = pci_dev->driver;
597 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
598 || drv->resume_early);
599
600 /*
601 * Legacy PM support is used by default, so warn if the new framework is
602 * supported as well. Drivers are supposed to support either the
603 * former, or the latter, but not both at the same time.
604 */
605 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
606 drv->name, pci_dev->vendor, pci_dev->device);
607
608 return ret;
609}
610
611/* New power management framework */
612
613static int pci_pm_prepare(struct device *dev)
614{
615 struct device_driver *drv = dev->driver;
616 int error = 0;
617
618 /*
619 * Devices having power.ignore_children set may still be necessary for
620 * suspending their children in the next phase of device suspend.
621 */
622 if (dev->power.ignore_children)
623 pm_runtime_resume(dev);
624
625 if (drv && drv->pm && drv->pm->prepare)
626 error = drv->pm->prepare(dev);
627
628 return error;
629}
630
631
632#else /* !CONFIG_PM_SLEEP */
633
634#define pci_pm_prepare NULL
635
636#endif /* !CONFIG_PM_SLEEP */
637
638#ifdef CONFIG_SUSPEND
639
640static int pci_pm_suspend(struct device *dev)
641{
642 struct pci_dev *pci_dev = to_pci_dev(dev);
643 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
644
645 if (pci_has_legacy_pm_support(pci_dev))
646 return pci_legacy_suspend(dev, PMSG_SUSPEND);
647
648 if (!pm) {
649 pci_pm_default_suspend(pci_dev);
650 goto Fixup;
651 }
652
653 /*
654 * PCI devices suspended at run time need to be resumed at this point,
655 * because in general it is necessary to reconfigure them for system
656 * suspend. Namely, if the device is supposed to wake up the system
657 * from the sleep state, we may need to reconfigure it for this purpose.
658 * In turn, if the device is not supposed to wake up the system from the
659 * sleep state, we'll have to prevent it from signaling wake-up.
660 */
661 pm_runtime_resume(dev);
662
663 pci_dev->state_saved = false;
664 if (pm->suspend) {
665 pci_power_t prev = pci_dev->current_state;
666 int error;
667
668 error = pm->suspend(dev);
669 suspend_report_result(pm->suspend, error);
670 if (error)
671 return error;
672
673 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
674 && pci_dev->current_state != PCI_UNKNOWN) {
675 WARN_ONCE(pci_dev->current_state != prev,
676 "PCI PM: State of device not saved by %pF\n",
677 pm->suspend);
678 }
679 }
680
681 Fixup:
682 pci_fixup_device(pci_fixup_suspend, pci_dev);
683
684 return 0;
685}
686
687static int pci_pm_suspend_noirq(struct device *dev)
688{
689 struct pci_dev *pci_dev = to_pci_dev(dev);
690 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
691
692 if (pci_has_legacy_pm_support(pci_dev))
693 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
694
695 if (!pm) {
696 pci_save_state(pci_dev);
697 return 0;
698 }
699
700 if (pm->suspend_noirq) {
701 pci_power_t prev = pci_dev->current_state;
702 int error;
703
704 error = pm->suspend_noirq(dev);
705 suspend_report_result(pm->suspend_noirq, error);
706 if (error)
707 return error;
708
709 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
710 && pci_dev->current_state != PCI_UNKNOWN) {
711 WARN_ONCE(pci_dev->current_state != prev,
712 "PCI PM: State of device not saved by %pF\n",
713 pm->suspend_noirq);
714 return 0;
715 }
716 }
717
718 if (!pci_dev->state_saved) {
719 pci_save_state(pci_dev);
720 if (!pci_is_bridge(pci_dev))
721 pci_prepare_to_sleep(pci_dev);
722 }
723
724 pci_pm_set_unknown_state(pci_dev);
725
726 /*
727 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
728 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
729 * hasn't been quiesced and tries to turn it off. If the controller
730 * is already in D3, this can hang or cause memory corruption.
731 *
732 * Since the value of the COMMAND register doesn't matter once the
733 * device has been suspended, we can safely set it to 0 here.
734 */
735 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
736 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
737
738 return 0;
739}
740
741static int pci_pm_resume_noirq(struct device *dev)
742{
743 struct pci_dev *pci_dev = to_pci_dev(dev);
744 struct device_driver *drv = dev->driver;
745 int error = 0;
746
747 pci_pm_default_resume_early(pci_dev);
748
749 if (pci_has_legacy_pm_support(pci_dev))
750 return pci_legacy_resume_early(dev);
751
752 if (drv && drv->pm && drv->pm->resume_noirq)
753 error = drv->pm->resume_noirq(dev);
754
755 return error;
756}
757
758static int pci_pm_resume(struct device *dev)
759{
760 struct pci_dev *pci_dev = to_pci_dev(dev);
761 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
762 int error = 0;
763
764 /*
765 * This is necessary for the suspend error path in which resume is
766 * called without restoring the standard config registers of the device.
767 */
768 if (pci_dev->state_saved)
769 pci_restore_standard_config(pci_dev);
770
771 if (pci_has_legacy_pm_support(pci_dev))
772 return pci_legacy_resume(dev);
773
774 pci_pm_default_resume(pci_dev);
775
776 if (pm) {
777 if (pm->resume)
778 error = pm->resume(dev);
779 } else {
780 pci_pm_reenable_device(pci_dev);
781 }
782
783 return error;
784}
785
786#else /* !CONFIG_SUSPEND */
787
788#define pci_pm_suspend NULL
789#define pci_pm_suspend_noirq NULL
790#define pci_pm_resume NULL
791#define pci_pm_resume_noirq NULL
792
793#endif /* !CONFIG_SUSPEND */
794
795#ifdef CONFIG_HIBERNATE_CALLBACKS
796
797
798/*
799 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
800 * a hibernate transition
801 */
802struct dev_pm_ops __weak pcibios_pm_ops;
803
804static int pci_pm_freeze(struct device *dev)
805{
806 struct pci_dev *pci_dev = to_pci_dev(dev);
807 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
808
809 if (pci_has_legacy_pm_support(pci_dev))
810 return pci_legacy_suspend(dev, PMSG_FREEZE);
811
812 if (!pm) {
813 pci_pm_default_suspend(pci_dev);
814 return 0;
815 }
816
817 /*
818 * This used to be done in pci_pm_prepare() for all devices and some
819 * drivers may depend on it, so do it here. Ideally, runtime-suspended
820 * devices should not be touched during freeze/thaw transitions,
821 * however.
822 */
823 pm_runtime_resume(dev);
824
825 pci_dev->state_saved = false;
826 if (pm->freeze) {
827 int error;
828
829 error = pm->freeze(dev);
830 suspend_report_result(pm->freeze, error);
831 if (error)
832 return error;
833 }
834
835 if (pcibios_pm_ops.freeze)
836 return pcibios_pm_ops.freeze(dev);
837
838 return 0;
839}
840
841static int pci_pm_freeze_noirq(struct device *dev)
842{
843 struct pci_dev *pci_dev = to_pci_dev(dev);
844 struct device_driver *drv = dev->driver;
845
846 if (pci_has_legacy_pm_support(pci_dev))
847 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
848
849 if (drv && drv->pm && drv->pm->freeze_noirq) {
850 int error;
851
852 error = drv->pm->freeze_noirq(dev);
853 suspend_report_result(drv->pm->freeze_noirq, error);
854 if (error)
855 return error;
856 }
857
858 if (!pci_dev->state_saved)
859 pci_save_state(pci_dev);
860
861 pci_pm_set_unknown_state(pci_dev);
862
863 if (pcibios_pm_ops.freeze_noirq)
864 return pcibios_pm_ops.freeze_noirq(dev);
865
866 return 0;
867}
868
869static int pci_pm_thaw_noirq(struct device *dev)
870{
871 struct pci_dev *pci_dev = to_pci_dev(dev);
872 struct device_driver *drv = dev->driver;
873 int error = 0;
874
875 if (pcibios_pm_ops.thaw_noirq) {
876 error = pcibios_pm_ops.thaw_noirq(dev);
877 if (error)
878 return error;
879 }
880
881 if (pci_has_legacy_pm_support(pci_dev))
882 return pci_legacy_resume_early(dev);
883
884 pci_update_current_state(pci_dev, PCI_D0);
885
886 if (drv && drv->pm && drv->pm->thaw_noirq)
887 error = drv->pm->thaw_noirq(dev);
888
889 return error;
890}
891
892static int pci_pm_thaw(struct device *dev)
893{
894 struct pci_dev *pci_dev = to_pci_dev(dev);
895 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
896 int error = 0;
897
898 if (pcibios_pm_ops.thaw) {
899 error = pcibios_pm_ops.thaw(dev);
900 if (error)
901 return error;
902 }
903
904 if (pci_has_legacy_pm_support(pci_dev))
905 return pci_legacy_resume(dev);
906
907 if (pm) {
908 if (pm->thaw)
909 error = pm->thaw(dev);
910 } else {
911 pci_pm_reenable_device(pci_dev);
912 }
913
914 pci_dev->state_saved = false;
915
916 return error;
917}
918
919static int pci_pm_poweroff(struct device *dev)
920{
921 struct pci_dev *pci_dev = to_pci_dev(dev);
922 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
923
924 if (pci_has_legacy_pm_support(pci_dev))
925 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
926
927 if (!pm) {
928 pci_pm_default_suspend(pci_dev);
929 goto Fixup;
930 }
931
932 /* The reason to do that is the same as in pci_pm_suspend(). */
933 pm_runtime_resume(dev);
934
935 pci_dev->state_saved = false;
936 if (pm->poweroff) {
937 int error;
938
939 error = pm->poweroff(dev);
940 suspend_report_result(pm->poweroff, error);
941 if (error)
942 return error;
943 }
944
945 Fixup:
946 pci_fixup_device(pci_fixup_suspend, pci_dev);
947
948 if (pcibios_pm_ops.poweroff)
949 return pcibios_pm_ops.poweroff(dev);
950
951 return 0;
952}
953
954static int pci_pm_poweroff_noirq(struct device *dev)
955{
956 struct pci_dev *pci_dev = to_pci_dev(dev);
957 struct device_driver *drv = dev->driver;
958
959 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
960 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
961
962 if (!drv || !drv->pm)
963 return 0;
964
965 if (drv->pm->poweroff_noirq) {
966 int error;
967
968 error = drv->pm->poweroff_noirq(dev);
969 suspend_report_result(drv->pm->poweroff_noirq, error);
970 if (error)
971 return error;
972 }
973
974 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
975 pci_prepare_to_sleep(pci_dev);
976
977 /*
978 * The reason for doing this here is the same as for the analogous code
979 * in pci_pm_suspend_noirq().
980 */
981 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
982 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
983
984 if (pcibios_pm_ops.poweroff_noirq)
985 return pcibios_pm_ops.poweroff_noirq(dev);
986
987 return 0;
988}
989
990static int pci_pm_restore_noirq(struct device *dev)
991{
992 struct pci_dev *pci_dev = to_pci_dev(dev);
993 struct device_driver *drv = dev->driver;
994 int error = 0;
995
996 if (pcibios_pm_ops.restore_noirq) {
997 error = pcibios_pm_ops.restore_noirq(dev);
998 if (error)
999 return error;
1000 }
1001
1002 pci_pm_default_resume_early(pci_dev);
1003
1004 if (pci_has_legacy_pm_support(pci_dev))
1005 return pci_legacy_resume_early(dev);
1006
1007 if (drv && drv->pm && drv->pm->restore_noirq)
1008 error = drv->pm->restore_noirq(dev);
1009
1010 return error;
1011}
1012
1013static int pci_pm_restore(struct device *dev)
1014{
1015 struct pci_dev *pci_dev = to_pci_dev(dev);
1016 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1017 int error = 0;
1018
1019 if (pcibios_pm_ops.restore) {
1020 error = pcibios_pm_ops.restore(dev);
1021 if (error)
1022 return error;
1023 }
1024
1025 /*
1026 * This is necessary for the hibernation error path in which restore is
1027 * called without restoring the standard config registers of the device.
1028 */
1029 if (pci_dev->state_saved)
1030 pci_restore_standard_config(pci_dev);
1031
1032 if (pci_has_legacy_pm_support(pci_dev))
1033 return pci_legacy_resume(dev);
1034
1035 pci_pm_default_resume(pci_dev);
1036
1037 if (pm) {
1038 if (pm->restore)
1039 error = pm->restore(dev);
1040 } else {
1041 pci_pm_reenable_device(pci_dev);
1042 }
1043
1044 return error;
1045}
1046
1047#else /* !CONFIG_HIBERNATE_CALLBACKS */
1048
1049#define pci_pm_freeze NULL
1050#define pci_pm_freeze_noirq NULL
1051#define pci_pm_thaw NULL
1052#define pci_pm_thaw_noirq NULL
1053#define pci_pm_poweroff NULL
1054#define pci_pm_poweroff_noirq NULL
1055#define pci_pm_restore NULL
1056#define pci_pm_restore_noirq NULL
1057
1058#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1059
1060#ifdef CONFIG_PM_RUNTIME
1061
1062static int pci_pm_runtime_suspend(struct device *dev)
1063{
1064 struct pci_dev *pci_dev = to_pci_dev(dev);
1065 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1066 pci_power_t prev = pci_dev->current_state;
1067 int error;
1068
1069 /*
1070 * If pci_dev->driver is not set (unbound), the device should
1071 * always remain in D0 regardless of the runtime PM status
1072 */
1073 if (!pci_dev->driver)
1074 return 0;
1075
1076 if (!pm || !pm->runtime_suspend)
1077 return -ENOSYS;
1078
1079 pci_dev->state_saved = false;
1080 pci_dev->no_d3cold = false;
1081 error = pm->runtime_suspend(dev);
1082 suspend_report_result(pm->runtime_suspend, error);
1083 if (error)
1084 return error;
1085 if (!pci_dev->d3cold_allowed)
1086 pci_dev->no_d3cold = true;
1087
1088 pci_fixup_device(pci_fixup_suspend, pci_dev);
1089
1090 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1091 && pci_dev->current_state != PCI_UNKNOWN) {
1092 WARN_ONCE(pci_dev->current_state != prev,
1093 "PCI PM: State of device not saved by %pF\n",
1094 pm->runtime_suspend);
1095 return 0;
1096 }
1097
1098 if (!pci_dev->state_saved) {
1099 pci_save_state(pci_dev);
1100 pci_finish_runtime_suspend(pci_dev);
1101 }
1102
1103 return 0;
1104}
1105
1106static int pci_pm_runtime_resume(struct device *dev)
1107{
1108 int rc;
1109 struct pci_dev *pci_dev = to_pci_dev(dev);
1110 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1111
1112 /*
1113 * If pci_dev->driver is not set (unbound), the device should
1114 * always remain in D0 regardless of the runtime PM status
1115 */
1116 if (!pci_dev->driver)
1117 return 0;
1118
1119 if (!pm || !pm->runtime_resume)
1120 return -ENOSYS;
1121
1122 pci_restore_standard_config(pci_dev);
1123 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1124 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1125 pci_fixup_device(pci_fixup_resume, pci_dev);
1126
1127 rc = pm->runtime_resume(dev);
1128
1129 pci_dev->runtime_d3cold = false;
1130
1131 return rc;
1132}
1133
1134static int pci_pm_runtime_idle(struct device *dev)
1135{
1136 struct pci_dev *pci_dev = to_pci_dev(dev);
1137 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1138 int ret = 0;
1139
1140 /*
1141 * If pci_dev->driver is not set (unbound), the device should
1142 * always remain in D0 regardless of the runtime PM status
1143 */
1144 if (!pci_dev->driver)
1145 return 0;
1146
1147 if (!pm)
1148 return -ENOSYS;
1149
1150 if (pm->runtime_idle)
1151 ret = pm->runtime_idle(dev);
1152
1153 return ret;
1154}
1155
1156#else /* !CONFIG_PM_RUNTIME */
1157
1158#define pci_pm_runtime_suspend NULL
1159#define pci_pm_runtime_resume NULL
1160#define pci_pm_runtime_idle NULL
1161
1162#endif /* !CONFIG_PM_RUNTIME */
1163
1164#ifdef CONFIG_PM
1165
1166static const struct dev_pm_ops pci_dev_pm_ops = {
1167 .prepare = pci_pm_prepare,
1168 .suspend = pci_pm_suspend,
1169 .resume = pci_pm_resume,
1170 .freeze = pci_pm_freeze,
1171 .thaw = pci_pm_thaw,
1172 .poweroff = pci_pm_poweroff,
1173 .restore = pci_pm_restore,
1174 .suspend_noirq = pci_pm_suspend_noirq,
1175 .resume_noirq = pci_pm_resume_noirq,
1176 .freeze_noirq = pci_pm_freeze_noirq,
1177 .thaw_noirq = pci_pm_thaw_noirq,
1178 .poweroff_noirq = pci_pm_poweroff_noirq,
1179 .restore_noirq = pci_pm_restore_noirq,
1180 .runtime_suspend = pci_pm_runtime_suspend,
1181 .runtime_resume = pci_pm_runtime_resume,
1182 .runtime_idle = pci_pm_runtime_idle,
1183};
1184
1185#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1186
1187#else /* !COMFIG_PM_OPS */
1188
1189#define PCI_PM_OPS_PTR NULL
1190
1191#endif /* !COMFIG_PM_OPS */
1192
1193/**
1194 * __pci_register_driver - register a new pci driver
1195 * @drv: the driver structure to register
1196 * @owner: owner module of drv
1197 * @mod_name: module name string
1198 *
1199 * Adds the driver structure to the list of registered drivers.
1200 * Returns a negative value on error, otherwise 0.
1201 * If no error occurred, the driver remains registered even if
1202 * no device was claimed during registration.
1203 */
1204int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1205 const char *mod_name)
1206{
1207 /* initialize common driver fields */
1208 drv->driver.name = drv->name;
1209 drv->driver.bus = &pci_bus_type;
1210 drv->driver.owner = owner;
1211 drv->driver.mod_name = mod_name;
1212
1213 spin_lock_init(&drv->dynids.lock);
1214 INIT_LIST_HEAD(&drv->dynids.list);
1215
1216 /* register with core */
1217 return driver_register(&drv->driver);
1218}
1219
1220/**
1221 * pci_unregister_driver - unregister a pci driver
1222 * @drv: the driver structure to unregister
1223 *
1224 * Deletes the driver structure from the list of registered PCI drivers,
1225 * gives it a chance to clean up by calling its remove() function for
1226 * each device it was responsible for, and marks those devices as
1227 * driverless.
1228 */
1229
1230void
1231pci_unregister_driver(struct pci_driver *drv)
1232{
1233 driver_unregister(&drv->driver);
1234 pci_free_dynids(drv);
1235}
1236
1237static struct pci_driver pci_compat_driver = {
1238 .name = "compat"
1239};
1240
1241/**
1242 * pci_dev_driver - get the pci_driver of a device
1243 * @dev: the device to query
1244 *
1245 * Returns the appropriate pci_driver structure or %NULL if there is no
1246 * registered driver for the device.
1247 */
1248struct pci_driver *
1249pci_dev_driver(const struct pci_dev *dev)
1250{
1251 if (dev->driver)
1252 return dev->driver;
1253 else {
1254 int i;
1255 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1256 if (dev->resource[i].flags & IORESOURCE_BUSY)
1257 return &pci_compat_driver;
1258 }
1259 return NULL;
1260}
1261
1262/**
1263 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1264 * @dev: the PCI device structure to match against
1265 * @drv: the device driver to search for matching PCI device id structures
1266 *
1267 * Used by a driver to check whether a PCI device present in the
1268 * system is in its list of supported devices. Returns the matching
1269 * pci_device_id structure or %NULL if there is no match.
1270 */
1271static int pci_bus_match(struct device *dev, struct device_driver *drv)
1272{
1273 struct pci_dev *pci_dev = to_pci_dev(dev);
1274 struct pci_driver *pci_drv;
1275 const struct pci_device_id *found_id;
1276
1277 if (!pci_dev->match_driver)
1278 return 0;
1279
1280 pci_drv = to_pci_driver(drv);
1281 found_id = pci_match_device(pci_drv, pci_dev);
1282 if (found_id)
1283 return 1;
1284
1285 return 0;
1286}
1287
1288/**
1289 * pci_dev_get - increments the reference count of the pci device structure
1290 * @dev: the device being referenced
1291 *
1292 * Each live reference to a device should be refcounted.
1293 *
1294 * Drivers for PCI devices should normally record such references in
1295 * their probe() methods, when they bind to a device, and release
1296 * them by calling pci_dev_put(), in their disconnect() methods.
1297 *
1298 * A pointer to the device with the incremented reference counter is returned.
1299 */
1300struct pci_dev *pci_dev_get(struct pci_dev *dev)
1301{
1302 if (dev)
1303 get_device(&dev->dev);
1304 return dev;
1305}
1306
1307/**
1308 * pci_dev_put - release a use of the pci device structure
1309 * @dev: device that's been disconnected
1310 *
1311 * Must be called when a user of a device is finished with it. When the last
1312 * user of the device calls this function, the memory of the device is freed.
1313 */
1314void pci_dev_put(struct pci_dev *dev)
1315{
1316 if (dev)
1317 put_device(&dev->dev);
1318}
1319
1320static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1321{
1322 struct pci_dev *pdev;
1323
1324 if (!dev)
1325 return -ENODEV;
1326
1327 pdev = to_pci_dev(dev);
1328 if (!pdev)
1329 return -ENODEV;
1330
1331 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1332 return -ENOMEM;
1333
1334 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1335 return -ENOMEM;
1336
1337 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1338 pdev->subsystem_device))
1339 return -ENOMEM;
1340
1341 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1342 return -ENOMEM;
1343
1344 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1345 pdev->vendor, pdev->device,
1346 pdev->subsystem_vendor, pdev->subsystem_device,
1347 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1348 (u8)(pdev->class)))
1349 return -ENOMEM;
1350 return 0;
1351}
1352
1353struct bus_type pci_bus_type = {
1354 .name = "pci",
1355 .match = pci_bus_match,
1356 .uevent = pci_uevent,
1357 .probe = pci_device_probe,
1358 .remove = pci_device_remove,
1359 .shutdown = pci_device_shutdown,
1360 .dev_groups = pci_dev_groups,
1361 .bus_groups = pci_bus_groups,
1362 .drv_groups = pci_drv_groups,
1363 .pm = PCI_PM_OPS_PTR,
1364};
1365
1366static int __init pci_driver_init(void)
1367{
1368 return bus_register(&pci_bus_type);
1369}
1370
1371postcore_initcall(pci_driver_init);
1372
1373EXPORT_SYMBOL_GPL(pci_add_dynid);
1374EXPORT_SYMBOL(pci_match_id);
1375EXPORT_SYMBOL(__pci_register_driver);
1376EXPORT_SYMBOL(pci_unregister_driver);
1377EXPORT_SYMBOL(pci_dev_driver);
1378EXPORT_SYMBOL(pci_bus_type);
1379EXPORT_SYMBOL(pci_dev_get);
1380EXPORT_SYMBOL(pci_dev_put);