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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/sched/isolation.h>
16#include <linux/cpu.h>
17#include <linux/pm_runtime.h>
18#include <linux/suspend.h>
19#include <linux/kexec.h>
20#include <linux/of_device.h>
21#include <linux/acpi.h>
22#include "pci.h"
23#include "pcie/portdrv.h"
24
25struct pci_dynid {
26 struct list_head node;
27 struct pci_device_id id;
28};
29
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
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 if (!dynid)
61 return -ENOMEM;
62
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
70
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
74
75 return driver_attach(&drv->driver);
76}
77EXPORT_SYMBOL_GPL(pci_add_dynid);
78
79static void pci_free_dynids(struct pci_driver *drv)
80{
81 struct pci_dynid *dynid, *n;
82
83 spin_lock(&drv->dynids.lock);
84 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
85 list_del(&dynid->node);
86 kfree(dynid);
87 }
88 spin_unlock(&drv->dynids.lock);
89}
90
91/**
92 * store_new_id - sysfs frontend to pci_add_dynid()
93 * @driver: target device driver
94 * @buf: buffer for scanning device ID data
95 * @count: input size
96 *
97 * Allow PCI IDs to be added to an existing driver via sysfs.
98 */
99static ssize_t new_id_store(struct device_driver *driver, const char *buf,
100 size_t count)
101{
102 struct pci_driver *pdrv = to_pci_driver(driver);
103 const struct pci_device_id *ids = pdrv->id_table;
104 u32 vendor, device, subvendor = PCI_ANY_ID,
105 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
106 unsigned long driver_data = 0;
107 int fields = 0;
108 int retval = 0;
109
110 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
111 &vendor, &device, &subvendor, &subdevice,
112 &class, &class_mask, &driver_data);
113 if (fields < 2)
114 return -EINVAL;
115
116 if (fields != 7) {
117 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
118 if (!pdev)
119 return -ENOMEM;
120
121 pdev->vendor = vendor;
122 pdev->device = device;
123 pdev->subsystem_vendor = subvendor;
124 pdev->subsystem_device = subdevice;
125 pdev->class = class;
126
127 if (pci_match_id(pdrv->id_table, pdev))
128 retval = -EEXIST;
129
130 kfree(pdev);
131
132 if (retval)
133 return retval;
134 }
135
136 /* Only accept driver_data values that match an existing id_table
137 entry */
138 if (ids) {
139 retval = -EINVAL;
140 while (ids->vendor || ids->subvendor || ids->class_mask) {
141 if (driver_data == ids->driver_data) {
142 retval = 0;
143 break;
144 }
145 ids++;
146 }
147 if (retval) /* No match */
148 return retval;
149 }
150
151 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
152 class, class_mask, driver_data);
153 if (retval)
154 return retval;
155 return count;
156}
157static DRIVER_ATTR_WO(new_id);
158
159/**
160 * store_remove_id - remove a PCI device ID from this driver
161 * @driver: target device driver
162 * @buf: buffer for scanning device ID data
163 * @count: input size
164 *
165 * Removes a dynamic pci device ID to this driver.
166 */
167static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
168 size_t count)
169{
170 struct pci_dynid *dynid, *n;
171 struct pci_driver *pdrv = to_pci_driver(driver);
172 u32 vendor, device, subvendor = PCI_ANY_ID,
173 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
174 int fields = 0;
175 size_t retval = -ENODEV;
176
177 fields = sscanf(buf, "%x %x %x %x %x %x",
178 &vendor, &device, &subvendor, &subdevice,
179 &class, &class_mask);
180 if (fields < 2)
181 return -EINVAL;
182
183 spin_lock(&pdrv->dynids.lock);
184 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
185 struct pci_device_id *id = &dynid->id;
186 if ((id->vendor == vendor) &&
187 (id->device == device) &&
188 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
189 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
190 !((id->class ^ class) & class_mask)) {
191 list_del(&dynid->node);
192 kfree(dynid);
193 retval = count;
194 break;
195 }
196 }
197 spin_unlock(&pdrv->dynids.lock);
198
199 return retval;
200}
201static DRIVER_ATTR_WO(remove_id);
202
203static struct attribute *pci_drv_attrs[] = {
204 &driver_attr_new_id.attr,
205 &driver_attr_remove_id.attr,
206 NULL,
207};
208ATTRIBUTE_GROUPS(pci_drv);
209
210/**
211 * pci_match_id - See if a pci device matches a given pci_id table
212 * @ids: array of PCI device id structures to search in
213 * @dev: the PCI device structure to match against.
214 *
215 * Used by a driver to check whether a PCI device present in the
216 * system is in its list of supported devices. Returns the matching
217 * pci_device_id structure or %NULL if there is no match.
218 *
219 * Deprecated, don't use this as it will not catch any dynamic ids
220 * that a driver might want to check for.
221 */
222const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
223 struct pci_dev *dev)
224{
225 if (ids) {
226 while (ids->vendor || ids->subvendor || ids->class_mask) {
227 if (pci_match_one_device(ids, dev))
228 return ids;
229 ids++;
230 }
231 }
232 return NULL;
233}
234EXPORT_SYMBOL(pci_match_id);
235
236static const struct pci_device_id pci_device_id_any = {
237 .vendor = PCI_ANY_ID,
238 .device = PCI_ANY_ID,
239 .subvendor = PCI_ANY_ID,
240 .subdevice = PCI_ANY_ID,
241};
242
243/**
244 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
245 * @drv: the PCI driver to match against
246 * @dev: the PCI device structure to match against
247 *
248 * Used by a driver to check whether a PCI device present in the
249 * system is in its list of supported devices. Returns the matching
250 * pci_device_id structure or %NULL if there is no match.
251 */
252static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
253 struct pci_dev *dev)
254{
255 struct pci_dynid *dynid;
256 const struct pci_device_id *found_id = NULL;
257
258 /* When driver_override is set, only bind to the matching driver */
259 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
260 return NULL;
261
262 /* Look at the dynamic ids first, before the static ones */
263 spin_lock(&drv->dynids.lock);
264 list_for_each_entry(dynid, &drv->dynids.list, node) {
265 if (pci_match_one_device(&dynid->id, dev)) {
266 found_id = &dynid->id;
267 break;
268 }
269 }
270 spin_unlock(&drv->dynids.lock);
271
272 if (!found_id)
273 found_id = pci_match_id(drv->id_table, dev);
274
275 /* driver_override will always match, send a dummy id */
276 if (!found_id && dev->driver_override)
277 found_id = &pci_device_id_any;
278
279 return found_id;
280}
281
282struct drv_dev_and_id {
283 struct pci_driver *drv;
284 struct pci_dev *dev;
285 const struct pci_device_id *id;
286};
287
288static long local_pci_probe(void *_ddi)
289{
290 struct drv_dev_and_id *ddi = _ddi;
291 struct pci_dev *pci_dev = ddi->dev;
292 struct pci_driver *pci_drv = ddi->drv;
293 struct device *dev = &pci_dev->dev;
294 int rc;
295
296 /*
297 * Unbound PCI devices are always put in D0, regardless of
298 * runtime PM status. During probe, the device is set to
299 * active and the usage count is incremented. If the driver
300 * supports runtime PM, it should call pm_runtime_put_noidle(),
301 * or any other runtime PM helper function decrementing the usage
302 * count, in its probe routine and pm_runtime_get_noresume() in
303 * its remove routine.
304 */
305 pm_runtime_get_sync(dev);
306 pci_dev->driver = pci_drv;
307 rc = pci_drv->probe(pci_dev, ddi->id);
308 if (!rc)
309 return rc;
310 if (rc < 0) {
311 pci_dev->driver = NULL;
312 pm_runtime_put_sync(dev);
313 return rc;
314 }
315 /*
316 * Probe function should return < 0 for failure, 0 for success
317 * Treat values > 0 as success, but warn.
318 */
319 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
320 rc);
321 return 0;
322}
323
324static bool pci_physfn_is_probed(struct pci_dev *dev)
325{
326#ifdef CONFIG_PCI_IOV
327 return dev->is_virtfn && dev->physfn->is_probed;
328#else
329 return false;
330#endif
331}
332
333static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
334 const struct pci_device_id *id)
335{
336 int error, node, cpu;
337 int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
338 struct drv_dev_and_id ddi = { drv, dev, id };
339
340 /*
341 * Execute driver initialization on node where the device is
342 * attached. This way the driver likely allocates its local memory
343 * on the right node.
344 */
345 node = dev_to_node(&dev->dev);
346 dev->is_probed = 1;
347
348 cpu_hotplug_disable();
349
350 /*
351 * Prevent nesting work_on_cpu() for the case where a Virtual Function
352 * device is probed from work_on_cpu() of the Physical device.
353 */
354 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
355 pci_physfn_is_probed(dev))
356 cpu = nr_cpu_ids;
357 else
358 cpu = cpumask_any_and(cpumask_of_node(node),
359 housekeeping_cpumask(hk_flags));
360
361 if (cpu < nr_cpu_ids)
362 error = work_on_cpu(cpu, local_pci_probe, &ddi);
363 else
364 error = local_pci_probe(&ddi);
365
366 dev->is_probed = 0;
367 cpu_hotplug_enable();
368 return error;
369}
370
371/**
372 * __pci_device_probe - check if a driver wants to claim a specific PCI device
373 * @drv: driver to call to check if it wants the PCI device
374 * @pci_dev: PCI device being probed
375 *
376 * returns 0 on success, else error.
377 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
378 */
379static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
380{
381 const struct pci_device_id *id;
382 int error = 0;
383
384 if (!pci_dev->driver && drv->probe) {
385 error = -ENODEV;
386
387 id = pci_match_device(drv, pci_dev);
388 if (id)
389 error = pci_call_probe(drv, pci_dev, id);
390 }
391 return error;
392}
393
394int __weak pcibios_alloc_irq(struct pci_dev *dev)
395{
396 return 0;
397}
398
399void __weak pcibios_free_irq(struct pci_dev *dev)
400{
401}
402
403#ifdef CONFIG_PCI_IOV
404static inline bool pci_device_can_probe(struct pci_dev *pdev)
405{
406 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
407 pdev->driver_override);
408}
409#else
410static inline bool pci_device_can_probe(struct pci_dev *pdev)
411{
412 return true;
413}
414#endif
415
416static int pci_device_probe(struct device *dev)
417{
418 int error;
419 struct pci_dev *pci_dev = to_pci_dev(dev);
420 struct pci_driver *drv = to_pci_driver(dev->driver);
421
422 if (!pci_device_can_probe(pci_dev))
423 return -ENODEV;
424
425 pci_assign_irq(pci_dev);
426
427 error = pcibios_alloc_irq(pci_dev);
428 if (error < 0)
429 return error;
430
431 pci_dev_get(pci_dev);
432 error = __pci_device_probe(drv, pci_dev);
433 if (error) {
434 pcibios_free_irq(pci_dev);
435 pci_dev_put(pci_dev);
436 }
437
438 return error;
439}
440
441static int pci_device_remove(struct device *dev)
442{
443 struct pci_dev *pci_dev = to_pci_dev(dev);
444 struct pci_driver *drv = pci_dev->driver;
445
446 if (drv) {
447 if (drv->remove) {
448 pm_runtime_get_sync(dev);
449 drv->remove(pci_dev);
450 pm_runtime_put_noidle(dev);
451 }
452 pcibios_free_irq(pci_dev);
453 pci_dev->driver = NULL;
454 pci_iov_remove(pci_dev);
455 }
456
457 /* Undo the runtime PM settings in local_pci_probe() */
458 pm_runtime_put_sync(dev);
459
460 /*
461 * If the device is still on, set the power state as "unknown",
462 * since it might change by the next time we load the driver.
463 */
464 if (pci_dev->current_state == PCI_D0)
465 pci_dev->current_state = PCI_UNKNOWN;
466
467 /*
468 * We would love to complain here if pci_dev->is_enabled is set, that
469 * the driver should have called pci_disable_device(), but the
470 * unfortunate fact is there are too many odd BIOS and bridge setups
471 * that don't like drivers doing that all of the time.
472 * Oh well, we can dream of sane hardware when we sleep, no matter how
473 * horrible the crap we have to deal with is when we are awake...
474 */
475
476 pci_dev_put(pci_dev);
477 return 0;
478}
479
480static void pci_device_shutdown(struct device *dev)
481{
482 struct pci_dev *pci_dev = to_pci_dev(dev);
483 struct pci_driver *drv = pci_dev->driver;
484
485 pm_runtime_resume(dev);
486
487 if (drv && drv->shutdown)
488 drv->shutdown(pci_dev);
489
490 /*
491 * If this is a kexec reboot, turn off Bus Master bit on the
492 * device to tell it to not continue to do DMA. Don't touch
493 * devices in D3cold or unknown states.
494 * If it is not a kexec reboot, firmware will hit the PCI
495 * devices with big hammer and stop their DMA any way.
496 */
497 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
498 pci_clear_master(pci_dev);
499}
500
501#ifdef CONFIG_PM
502
503/* Auxiliary functions used for system resume and run-time resume. */
504
505/**
506 * pci_restore_standard_config - restore standard config registers of PCI device
507 * @pci_dev: PCI device to handle
508 */
509static int pci_restore_standard_config(struct pci_dev *pci_dev)
510{
511 pci_update_current_state(pci_dev, PCI_UNKNOWN);
512
513 if (pci_dev->current_state != PCI_D0) {
514 int error = pci_set_power_state(pci_dev, PCI_D0);
515 if (error)
516 return error;
517 }
518
519 pci_restore_state(pci_dev);
520 pci_pme_restore(pci_dev);
521 return 0;
522}
523
524static void pci_pm_default_resume(struct pci_dev *pci_dev)
525{
526 pci_fixup_device(pci_fixup_resume, pci_dev);
527 pci_enable_wake(pci_dev, PCI_D0, false);
528}
529
530#endif
531
532#ifdef CONFIG_PM_SLEEP
533
534static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
535{
536 pci_power_up(pci_dev);
537 pci_update_current_state(pci_dev, PCI_D0);
538 pci_restore_state(pci_dev);
539 pci_pme_restore(pci_dev);
540}
541
542/*
543 * Default "suspend" method for devices that have no driver provided suspend,
544 * or not even a driver at all (second part).
545 */
546static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
547{
548 /*
549 * mark its power state as "unknown", since we don't know if
550 * e.g. the BIOS will change its device state when we suspend.
551 */
552 if (pci_dev->current_state == PCI_D0)
553 pci_dev->current_state = PCI_UNKNOWN;
554}
555
556/*
557 * Default "resume" method for devices that have no driver provided resume,
558 * or not even a driver at all (second part).
559 */
560static int pci_pm_reenable_device(struct pci_dev *pci_dev)
561{
562 int retval;
563
564 /* if the device was enabled before suspend, reenable */
565 retval = pci_reenable_device(pci_dev);
566 /*
567 * if the device was busmaster before the suspend, make it busmaster
568 * again
569 */
570 if (pci_dev->is_busmaster)
571 pci_set_master(pci_dev);
572
573 return retval;
574}
575
576static int pci_legacy_suspend(struct device *dev, pm_message_t state)
577{
578 struct pci_dev *pci_dev = to_pci_dev(dev);
579 struct pci_driver *drv = pci_dev->driver;
580
581 if (drv && drv->suspend) {
582 pci_power_t prev = pci_dev->current_state;
583 int error;
584
585 error = drv->suspend(pci_dev, state);
586 suspend_report_result(drv->suspend, error);
587 if (error)
588 return error;
589
590 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
591 && pci_dev->current_state != PCI_UNKNOWN) {
592 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
593 "PCI PM: Device state not saved by %pS\n",
594 drv->suspend);
595 }
596 }
597
598 pci_fixup_device(pci_fixup_suspend, pci_dev);
599
600 return 0;
601}
602
603static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
604{
605 struct pci_dev *pci_dev = to_pci_dev(dev);
606
607 if (!pci_dev->state_saved)
608 pci_save_state(pci_dev);
609
610 pci_pm_set_unknown_state(pci_dev);
611
612 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
613
614 return 0;
615}
616
617static int pci_legacy_resume(struct device *dev)
618{
619 struct pci_dev *pci_dev = to_pci_dev(dev);
620 struct pci_driver *drv = pci_dev->driver;
621
622 pci_fixup_device(pci_fixup_resume, pci_dev);
623
624 return drv && drv->resume ?
625 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
626}
627
628/* Auxiliary functions used by the new power management framework */
629
630static void pci_pm_default_suspend(struct pci_dev *pci_dev)
631{
632 /* Disable non-bridge devices without PM support */
633 if (!pci_has_subordinate(pci_dev))
634 pci_disable_enabled_device(pci_dev);
635}
636
637static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
638{
639 struct pci_driver *drv = pci_dev->driver;
640 bool ret = drv && (drv->suspend || drv->resume);
641
642 /*
643 * Legacy PM support is used by default, so warn if the new framework is
644 * supported as well. Drivers are supposed to support either the
645 * former, or the latter, but not both at the same time.
646 */
647 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
648 pci_dev->vendor, pci_dev->device);
649
650 return ret;
651}
652
653/* New power management framework */
654
655static int pci_pm_prepare(struct device *dev)
656{
657 struct pci_dev *pci_dev = to_pci_dev(dev);
658 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
659
660 if (pm && pm->prepare) {
661 int error = pm->prepare(dev);
662 if (error < 0)
663 return error;
664
665 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
666 return 0;
667 }
668 if (pci_dev_need_resume(pci_dev))
669 return 0;
670
671 /*
672 * The PME setting needs to be adjusted here in case the direct-complete
673 * optimization is used with respect to this device.
674 */
675 pci_dev_adjust_pme(pci_dev);
676 return 1;
677}
678
679static void pci_pm_complete(struct device *dev)
680{
681 struct pci_dev *pci_dev = to_pci_dev(dev);
682
683 pci_dev_complete_resume(pci_dev);
684 pm_generic_complete(dev);
685
686 /* Resume device if platform firmware has put it in reset-power-on */
687 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
688 pci_power_t pre_sleep_state = pci_dev->current_state;
689
690 pci_refresh_power_state(pci_dev);
691 /*
692 * On platforms with ACPI this check may also trigger for
693 * devices sharing power resources if one of those power
694 * resources has been activated as a result of a change of the
695 * power state of another device sharing it. However, in that
696 * case it is also better to resume the device, in general.
697 */
698 if (pci_dev->current_state < pre_sleep_state)
699 pm_request_resume(dev);
700 }
701}
702
703#else /* !CONFIG_PM_SLEEP */
704
705#define pci_pm_prepare NULL
706#define pci_pm_complete NULL
707
708#endif /* !CONFIG_PM_SLEEP */
709
710#ifdef CONFIG_SUSPEND
711static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
712{
713 /*
714 * Some BIOSes forget to clear Root PME Status bits after system
715 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
716 * Clear those bits now just in case (shouldn't hurt).
717 */
718 if (pci_is_pcie(pci_dev) &&
719 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
720 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
721 pcie_clear_root_pme_status(pci_dev);
722}
723
724static int pci_pm_suspend(struct device *dev)
725{
726 struct pci_dev *pci_dev = to_pci_dev(dev);
727 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
728
729 pci_dev->skip_bus_pm = false;
730
731 if (pci_has_legacy_pm_support(pci_dev))
732 return pci_legacy_suspend(dev, PMSG_SUSPEND);
733
734 if (!pm) {
735 pci_pm_default_suspend(pci_dev);
736 return 0;
737 }
738
739 /*
740 * PCI devices suspended at run time may need to be resumed at this
741 * point, because in general it may be necessary to reconfigure them for
742 * system suspend. Namely, if the device is expected to wake up the
743 * system from the sleep state, it may have to be reconfigured for this
744 * purpose, or if the device is not expected to wake up the system from
745 * the sleep state, it should be prevented from signaling wakeup events
746 * going forward.
747 *
748 * Also if the driver of the device does not indicate that its system
749 * suspend callbacks can cope with runtime-suspended devices, it is
750 * better to resume the device from runtime suspend here.
751 */
752 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
753 pci_dev_need_resume(pci_dev)) {
754 pm_runtime_resume(dev);
755 pci_dev->state_saved = false;
756 } else {
757 pci_dev_adjust_pme(pci_dev);
758 }
759
760 if (pm->suspend) {
761 pci_power_t prev = pci_dev->current_state;
762 int error;
763
764 error = pm->suspend(dev);
765 suspend_report_result(pm->suspend, error);
766 if (error)
767 return error;
768
769 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
770 && pci_dev->current_state != PCI_UNKNOWN) {
771 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
772 "PCI PM: State of device not saved by %pS\n",
773 pm->suspend);
774 }
775 }
776
777 return 0;
778}
779
780static int pci_pm_suspend_late(struct device *dev)
781{
782 if (dev_pm_skip_suspend(dev))
783 return 0;
784
785 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
786
787 return pm_generic_suspend_late(dev);
788}
789
790static int pci_pm_suspend_noirq(struct device *dev)
791{
792 struct pci_dev *pci_dev = to_pci_dev(dev);
793 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
794
795 if (dev_pm_skip_suspend(dev))
796 return 0;
797
798 if (pci_has_legacy_pm_support(pci_dev))
799 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
800
801 if (!pm) {
802 pci_save_state(pci_dev);
803 goto Fixup;
804 }
805
806 if (pm->suspend_noirq) {
807 pci_power_t prev = pci_dev->current_state;
808 int error;
809
810 error = pm->suspend_noirq(dev);
811 suspend_report_result(pm->suspend_noirq, error);
812 if (error)
813 return error;
814
815 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
816 && pci_dev->current_state != PCI_UNKNOWN) {
817 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
818 "PCI PM: State of device not saved by %pS\n",
819 pm->suspend_noirq);
820 goto Fixup;
821 }
822 }
823
824 if (pci_dev->skip_bus_pm) {
825 /*
826 * Either the device is a bridge with a child in D0 below it, or
827 * the function is running for the second time in a row without
828 * going through full resume, which is possible only during
829 * suspend-to-idle in a spurious wakeup case. The device should
830 * be in D0 at this point, but if it is a bridge, it may be
831 * necessary to save its state.
832 */
833 if (!pci_dev->state_saved)
834 pci_save_state(pci_dev);
835 } else if (!pci_dev->state_saved) {
836 pci_save_state(pci_dev);
837 if (pci_power_manageable(pci_dev))
838 pci_prepare_to_sleep(pci_dev);
839 }
840
841 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
842 pci_power_name(pci_dev->current_state));
843
844 if (pci_dev->current_state == PCI_D0) {
845 pci_dev->skip_bus_pm = true;
846 /*
847 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
848 * downstream device is in D0, so avoid changing the power state
849 * of the parent bridge by setting the skip_bus_pm flag for it.
850 */
851 if (pci_dev->bus->self)
852 pci_dev->bus->self->skip_bus_pm = true;
853 }
854
855 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
856 pci_dbg(pci_dev, "PCI PM: Skipped\n");
857 goto Fixup;
858 }
859
860 pci_pm_set_unknown_state(pci_dev);
861
862 /*
863 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
864 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
865 * hasn't been quiesced and tries to turn it off. If the controller
866 * is already in D3, this can hang or cause memory corruption.
867 *
868 * Since the value of the COMMAND register doesn't matter once the
869 * device has been suspended, we can safely set it to 0 here.
870 */
871 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
872 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
873
874Fixup:
875 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
876
877 /*
878 * If the target system sleep state is suspend-to-idle, it is sufficient
879 * to check whether or not the device's wakeup settings are good for
880 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
881 * pci_pm_complete() to take care of fixing up the device's state
882 * anyway, if need be.
883 */
884 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
885 dev->power.may_skip_resume = false;
886
887 return 0;
888}
889
890static int pci_pm_resume_noirq(struct device *dev)
891{
892 struct pci_dev *pci_dev = to_pci_dev(dev);
893 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
894 pci_power_t prev_state = pci_dev->current_state;
895 bool skip_bus_pm = pci_dev->skip_bus_pm;
896
897 if (dev_pm_skip_resume(dev))
898 return 0;
899
900 /*
901 * In the suspend-to-idle case, devices left in D0 during suspend will
902 * stay in D0, so it is not necessary to restore or update their
903 * configuration here and attempting to put them into D0 again is
904 * pointless, so avoid doing that.
905 */
906 if (!(skip_bus_pm && pm_suspend_no_platform()))
907 pci_pm_default_resume_early(pci_dev);
908
909 pci_fixup_device(pci_fixup_resume_early, pci_dev);
910 pcie_pme_root_status_cleanup(pci_dev);
911
912 if (!skip_bus_pm && prev_state == PCI_D3cold)
913 pci_bridge_wait_for_secondary_bus(pci_dev);
914
915 if (pci_has_legacy_pm_support(pci_dev))
916 return 0;
917
918 if (pm && pm->resume_noirq)
919 return pm->resume_noirq(dev);
920
921 return 0;
922}
923
924static int pci_pm_resume_early(struct device *dev)
925{
926 if (dev_pm_skip_resume(dev))
927 return 0;
928
929 return pm_generic_resume_early(dev);
930}
931
932static int pci_pm_resume(struct device *dev)
933{
934 struct pci_dev *pci_dev = to_pci_dev(dev);
935 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
936
937 /*
938 * This is necessary for the suspend error path in which resume is
939 * called without restoring the standard config registers of the device.
940 */
941 if (pci_dev->state_saved)
942 pci_restore_standard_config(pci_dev);
943
944 if (pci_has_legacy_pm_support(pci_dev))
945 return pci_legacy_resume(dev);
946
947 pci_pm_default_resume(pci_dev);
948
949 if (pm) {
950 if (pm->resume)
951 return pm->resume(dev);
952 } else {
953 pci_pm_reenable_device(pci_dev);
954 }
955
956 return 0;
957}
958
959#else /* !CONFIG_SUSPEND */
960
961#define pci_pm_suspend NULL
962#define pci_pm_suspend_late NULL
963#define pci_pm_suspend_noirq NULL
964#define pci_pm_resume NULL
965#define pci_pm_resume_early NULL
966#define pci_pm_resume_noirq NULL
967
968#endif /* !CONFIG_SUSPEND */
969
970#ifdef CONFIG_HIBERNATE_CALLBACKS
971
972/*
973 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
974 * a hibernate transition
975 */
976struct dev_pm_ops __weak pcibios_pm_ops;
977
978static int pci_pm_freeze(struct device *dev)
979{
980 struct pci_dev *pci_dev = to_pci_dev(dev);
981 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
982
983 if (pci_has_legacy_pm_support(pci_dev))
984 return pci_legacy_suspend(dev, PMSG_FREEZE);
985
986 if (!pm) {
987 pci_pm_default_suspend(pci_dev);
988 return 0;
989 }
990
991 /*
992 * Resume all runtime-suspended devices before creating a snapshot
993 * image of system memory, because the restore kernel generally cannot
994 * be expected to always handle them consistently and they need to be
995 * put into the runtime-active metastate during system resume anyway,
996 * so it is better to ensure that the state saved in the image will be
997 * always consistent with that.
998 */
999 pm_runtime_resume(dev);
1000 pci_dev->state_saved = false;
1001
1002 if (pm->freeze) {
1003 int error;
1004
1005 error = pm->freeze(dev);
1006 suspend_report_result(pm->freeze, error);
1007 if (error)
1008 return error;
1009 }
1010
1011 return 0;
1012}
1013
1014static int pci_pm_freeze_noirq(struct device *dev)
1015{
1016 struct pci_dev *pci_dev = to_pci_dev(dev);
1017 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1018
1019 if (pci_has_legacy_pm_support(pci_dev))
1020 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1021
1022 if (pm && pm->freeze_noirq) {
1023 int error;
1024
1025 error = pm->freeze_noirq(dev);
1026 suspend_report_result(pm->freeze_noirq, error);
1027 if (error)
1028 return error;
1029 }
1030
1031 if (!pci_dev->state_saved)
1032 pci_save_state(pci_dev);
1033
1034 pci_pm_set_unknown_state(pci_dev);
1035
1036 if (pcibios_pm_ops.freeze_noirq)
1037 return pcibios_pm_ops.freeze_noirq(dev);
1038
1039 return 0;
1040}
1041
1042static int pci_pm_thaw_noirq(struct device *dev)
1043{
1044 struct pci_dev *pci_dev = to_pci_dev(dev);
1045 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1046 int error;
1047
1048 if (pcibios_pm_ops.thaw_noirq) {
1049 error = pcibios_pm_ops.thaw_noirq(dev);
1050 if (error)
1051 return error;
1052 }
1053
1054 /*
1055 * The pm->thaw_noirq() callback assumes the device has been
1056 * returned to D0 and its config state has been restored.
1057 *
1058 * In addition, pci_restore_state() restores MSI-X state in MMIO
1059 * space, which requires the device to be in D0, so return it to D0
1060 * in case the driver's "freeze" callbacks put it into a low-power
1061 * state.
1062 */
1063 pci_set_power_state(pci_dev, PCI_D0);
1064 pci_restore_state(pci_dev);
1065
1066 if (pci_has_legacy_pm_support(pci_dev))
1067 return 0;
1068
1069 if (pm && pm->thaw_noirq)
1070 return pm->thaw_noirq(dev);
1071
1072 return 0;
1073}
1074
1075static int pci_pm_thaw(struct device *dev)
1076{
1077 struct pci_dev *pci_dev = to_pci_dev(dev);
1078 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1079 int error = 0;
1080
1081 if (pci_has_legacy_pm_support(pci_dev))
1082 return pci_legacy_resume(dev);
1083
1084 if (pm) {
1085 if (pm->thaw)
1086 error = pm->thaw(dev);
1087 } else {
1088 pci_pm_reenable_device(pci_dev);
1089 }
1090
1091 pci_dev->state_saved = false;
1092
1093 return error;
1094}
1095
1096static int pci_pm_poweroff(struct device *dev)
1097{
1098 struct pci_dev *pci_dev = to_pci_dev(dev);
1099 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1100
1101 if (pci_has_legacy_pm_support(pci_dev))
1102 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1103
1104 if (!pm) {
1105 pci_pm_default_suspend(pci_dev);
1106 return 0;
1107 }
1108
1109 /* The reason to do that is the same as in pci_pm_suspend(). */
1110 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1111 pci_dev_need_resume(pci_dev)) {
1112 pm_runtime_resume(dev);
1113 pci_dev->state_saved = false;
1114 } else {
1115 pci_dev_adjust_pme(pci_dev);
1116 }
1117
1118 if (pm->poweroff) {
1119 int error;
1120
1121 error = pm->poweroff(dev);
1122 suspend_report_result(pm->poweroff, error);
1123 if (error)
1124 return error;
1125 }
1126
1127 return 0;
1128}
1129
1130static int pci_pm_poweroff_late(struct device *dev)
1131{
1132 if (dev_pm_skip_suspend(dev))
1133 return 0;
1134
1135 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1136
1137 return pm_generic_poweroff_late(dev);
1138}
1139
1140static int pci_pm_poweroff_noirq(struct device *dev)
1141{
1142 struct pci_dev *pci_dev = to_pci_dev(dev);
1143 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1144
1145 if (dev_pm_skip_suspend(dev))
1146 return 0;
1147
1148 if (pci_has_legacy_pm_support(pci_dev))
1149 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1150
1151 if (!pm) {
1152 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1153 return 0;
1154 }
1155
1156 if (pm->poweroff_noirq) {
1157 int error;
1158
1159 error = pm->poweroff_noirq(dev);
1160 suspend_report_result(pm->poweroff_noirq, error);
1161 if (error)
1162 return error;
1163 }
1164
1165 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1166 pci_prepare_to_sleep(pci_dev);
1167
1168 /*
1169 * The reason for doing this here is the same as for the analogous code
1170 * in pci_pm_suspend_noirq().
1171 */
1172 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1173 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1174
1175 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1176
1177 if (pcibios_pm_ops.poweroff_noirq)
1178 return pcibios_pm_ops.poweroff_noirq(dev);
1179
1180 return 0;
1181}
1182
1183static int pci_pm_restore_noirq(struct device *dev)
1184{
1185 struct pci_dev *pci_dev = to_pci_dev(dev);
1186 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1187 int error;
1188
1189 if (pcibios_pm_ops.restore_noirq) {
1190 error = pcibios_pm_ops.restore_noirq(dev);
1191 if (error)
1192 return error;
1193 }
1194
1195 pci_pm_default_resume_early(pci_dev);
1196 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1197
1198 if (pci_has_legacy_pm_support(pci_dev))
1199 return 0;
1200
1201 if (pm && pm->restore_noirq)
1202 return pm->restore_noirq(dev);
1203
1204 return 0;
1205}
1206
1207static int pci_pm_restore(struct device *dev)
1208{
1209 struct pci_dev *pci_dev = to_pci_dev(dev);
1210 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1211
1212 /*
1213 * This is necessary for the hibernation error path in which restore is
1214 * called without restoring the standard config registers of the device.
1215 */
1216 if (pci_dev->state_saved)
1217 pci_restore_standard_config(pci_dev);
1218
1219 if (pci_has_legacy_pm_support(pci_dev))
1220 return pci_legacy_resume(dev);
1221
1222 pci_pm_default_resume(pci_dev);
1223
1224 if (pm) {
1225 if (pm->restore)
1226 return pm->restore(dev);
1227 } else {
1228 pci_pm_reenable_device(pci_dev);
1229 }
1230
1231 return 0;
1232}
1233
1234#else /* !CONFIG_HIBERNATE_CALLBACKS */
1235
1236#define pci_pm_freeze NULL
1237#define pci_pm_freeze_noirq NULL
1238#define pci_pm_thaw NULL
1239#define pci_pm_thaw_noirq NULL
1240#define pci_pm_poweroff NULL
1241#define pci_pm_poweroff_late NULL
1242#define pci_pm_poweroff_noirq NULL
1243#define pci_pm_restore NULL
1244#define pci_pm_restore_noirq NULL
1245
1246#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1247
1248#ifdef CONFIG_PM
1249
1250static int pci_pm_runtime_suspend(struct device *dev)
1251{
1252 struct pci_dev *pci_dev = to_pci_dev(dev);
1253 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1254 pci_power_t prev = pci_dev->current_state;
1255 int error;
1256
1257 /*
1258 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1259 * but it may go to D3cold when the bridge above it runtime suspends.
1260 * Save its config space in case that happens.
1261 */
1262 if (!pci_dev->driver) {
1263 pci_save_state(pci_dev);
1264 return 0;
1265 }
1266
1267 pci_dev->state_saved = false;
1268 if (pm && pm->runtime_suspend) {
1269 error = pm->runtime_suspend(dev);
1270 /*
1271 * -EBUSY and -EAGAIN is used to request the runtime PM core
1272 * to schedule a new suspend, so log the event only with debug
1273 * log level.
1274 */
1275 if (error == -EBUSY || error == -EAGAIN) {
1276 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1277 pm->runtime_suspend, error);
1278 return error;
1279 } else if (error) {
1280 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1281 pm->runtime_suspend, error);
1282 return error;
1283 }
1284 }
1285
1286 pci_fixup_device(pci_fixup_suspend, pci_dev);
1287
1288 if (pm && pm->runtime_suspend
1289 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1290 && pci_dev->current_state != PCI_UNKNOWN) {
1291 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1292 "PCI PM: State of device not saved by %pS\n",
1293 pm->runtime_suspend);
1294 return 0;
1295 }
1296
1297 if (!pci_dev->state_saved) {
1298 pci_save_state(pci_dev);
1299 pci_finish_runtime_suspend(pci_dev);
1300 }
1301
1302 return 0;
1303}
1304
1305static int pci_pm_runtime_resume(struct device *dev)
1306{
1307 struct pci_dev *pci_dev = to_pci_dev(dev);
1308 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1309 pci_power_t prev_state = pci_dev->current_state;
1310 int error = 0;
1311
1312 /*
1313 * Restoring config space is necessary even if the device is not bound
1314 * to a driver because although we left it in D0, it may have gone to
1315 * D3cold when the bridge above it runtime suspended.
1316 */
1317 pci_restore_standard_config(pci_dev);
1318
1319 if (!pci_dev->driver)
1320 return 0;
1321
1322 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1323 pci_pm_default_resume(pci_dev);
1324
1325 if (prev_state == PCI_D3cold)
1326 pci_bridge_wait_for_secondary_bus(pci_dev);
1327
1328 if (pm && pm->runtime_resume)
1329 error = pm->runtime_resume(dev);
1330
1331 pci_dev->runtime_d3cold = false;
1332
1333 return error;
1334}
1335
1336static int pci_pm_runtime_idle(struct device *dev)
1337{
1338 struct pci_dev *pci_dev = to_pci_dev(dev);
1339 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1340
1341 /*
1342 * If pci_dev->driver is not set (unbound), the device should
1343 * always remain in D0 regardless of the runtime PM status
1344 */
1345 if (!pci_dev->driver)
1346 return 0;
1347
1348 if (!pm)
1349 return -ENOSYS;
1350
1351 if (pm->runtime_idle)
1352 return pm->runtime_idle(dev);
1353
1354 return 0;
1355}
1356
1357static const struct dev_pm_ops pci_dev_pm_ops = {
1358 .prepare = pci_pm_prepare,
1359 .complete = pci_pm_complete,
1360 .suspend = pci_pm_suspend,
1361 .suspend_late = pci_pm_suspend_late,
1362 .resume = pci_pm_resume,
1363 .resume_early = pci_pm_resume_early,
1364 .freeze = pci_pm_freeze,
1365 .thaw = pci_pm_thaw,
1366 .poweroff = pci_pm_poweroff,
1367 .poweroff_late = pci_pm_poweroff_late,
1368 .restore = pci_pm_restore,
1369 .suspend_noirq = pci_pm_suspend_noirq,
1370 .resume_noirq = pci_pm_resume_noirq,
1371 .freeze_noirq = pci_pm_freeze_noirq,
1372 .thaw_noirq = pci_pm_thaw_noirq,
1373 .poweroff_noirq = pci_pm_poweroff_noirq,
1374 .restore_noirq = pci_pm_restore_noirq,
1375 .runtime_suspend = pci_pm_runtime_suspend,
1376 .runtime_resume = pci_pm_runtime_resume,
1377 .runtime_idle = pci_pm_runtime_idle,
1378};
1379
1380#define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1381
1382#else /* !CONFIG_PM */
1383
1384#define pci_pm_runtime_suspend NULL
1385#define pci_pm_runtime_resume NULL
1386#define pci_pm_runtime_idle NULL
1387
1388#define PCI_PM_OPS_PTR NULL
1389
1390#endif /* !CONFIG_PM */
1391
1392/**
1393 * __pci_register_driver - register a new pci driver
1394 * @drv: the driver structure to register
1395 * @owner: owner module of drv
1396 * @mod_name: module name string
1397 *
1398 * Adds the driver structure to the list of registered drivers.
1399 * Returns a negative value on error, otherwise 0.
1400 * If no error occurred, the driver remains registered even if
1401 * no device was claimed during registration.
1402 */
1403int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1404 const char *mod_name)
1405{
1406 /* initialize common driver fields */
1407 drv->driver.name = drv->name;
1408 drv->driver.bus = &pci_bus_type;
1409 drv->driver.owner = owner;
1410 drv->driver.mod_name = mod_name;
1411 drv->driver.groups = drv->groups;
1412
1413 spin_lock_init(&drv->dynids.lock);
1414 INIT_LIST_HEAD(&drv->dynids.list);
1415
1416 /* register with core */
1417 return driver_register(&drv->driver);
1418}
1419EXPORT_SYMBOL(__pci_register_driver);
1420
1421/**
1422 * pci_unregister_driver - unregister a pci driver
1423 * @drv: the driver structure to unregister
1424 *
1425 * Deletes the driver structure from the list of registered PCI drivers,
1426 * gives it a chance to clean up by calling its remove() function for
1427 * each device it was responsible for, and marks those devices as
1428 * driverless.
1429 */
1430
1431void pci_unregister_driver(struct pci_driver *drv)
1432{
1433 driver_unregister(&drv->driver);
1434 pci_free_dynids(drv);
1435}
1436EXPORT_SYMBOL(pci_unregister_driver);
1437
1438static struct pci_driver pci_compat_driver = {
1439 .name = "compat"
1440};
1441
1442/**
1443 * pci_dev_driver - get the pci_driver of a device
1444 * @dev: the device to query
1445 *
1446 * Returns the appropriate pci_driver structure or %NULL if there is no
1447 * registered driver for the device.
1448 */
1449struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1450{
1451 if (dev->driver)
1452 return dev->driver;
1453 else {
1454 int i;
1455 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1456 if (dev->resource[i].flags & IORESOURCE_BUSY)
1457 return &pci_compat_driver;
1458 }
1459 return NULL;
1460}
1461EXPORT_SYMBOL(pci_dev_driver);
1462
1463/**
1464 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1465 * @dev: the PCI device structure to match against
1466 * @drv: the device driver to search for matching PCI device id structures
1467 *
1468 * Used by a driver to check whether a PCI device present in the
1469 * system is in its list of supported devices. Returns the matching
1470 * pci_device_id structure or %NULL if there is no match.
1471 */
1472static int pci_bus_match(struct device *dev, struct device_driver *drv)
1473{
1474 struct pci_dev *pci_dev = to_pci_dev(dev);
1475 struct pci_driver *pci_drv;
1476 const struct pci_device_id *found_id;
1477
1478 if (!pci_dev->match_driver)
1479 return 0;
1480
1481 pci_drv = to_pci_driver(drv);
1482 found_id = pci_match_device(pci_drv, pci_dev);
1483 if (found_id)
1484 return 1;
1485
1486 return 0;
1487}
1488
1489/**
1490 * pci_dev_get - increments the reference count of the pci device structure
1491 * @dev: the device being referenced
1492 *
1493 * Each live reference to a device should be refcounted.
1494 *
1495 * Drivers for PCI devices should normally record such references in
1496 * their probe() methods, when they bind to a device, and release
1497 * them by calling pci_dev_put(), in their disconnect() methods.
1498 *
1499 * A pointer to the device with the incremented reference counter is returned.
1500 */
1501struct pci_dev *pci_dev_get(struct pci_dev *dev)
1502{
1503 if (dev)
1504 get_device(&dev->dev);
1505 return dev;
1506}
1507EXPORT_SYMBOL(pci_dev_get);
1508
1509/**
1510 * pci_dev_put - release a use of the pci device structure
1511 * @dev: device that's been disconnected
1512 *
1513 * Must be called when a user of a device is finished with it. When the last
1514 * user of the device calls this function, the memory of the device is freed.
1515 */
1516void pci_dev_put(struct pci_dev *dev)
1517{
1518 if (dev)
1519 put_device(&dev->dev);
1520}
1521EXPORT_SYMBOL(pci_dev_put);
1522
1523static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1524{
1525 struct pci_dev *pdev;
1526
1527 if (!dev)
1528 return -ENODEV;
1529
1530 pdev = to_pci_dev(dev);
1531
1532 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1533 return -ENOMEM;
1534
1535 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1536 return -ENOMEM;
1537
1538 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1539 pdev->subsystem_device))
1540 return -ENOMEM;
1541
1542 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1543 return -ENOMEM;
1544
1545 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1546 pdev->vendor, pdev->device,
1547 pdev->subsystem_vendor, pdev->subsystem_device,
1548 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1549 (u8)(pdev->class)))
1550 return -ENOMEM;
1551
1552 return 0;
1553}
1554
1555#if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
1556/**
1557 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1558 * @pdev: PCI device undergoing error recovery
1559 * @err_type: type of error event
1560 */
1561void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1562{
1563 int idx = 0;
1564 char *envp[3];
1565
1566 switch (err_type) {
1567 case PCI_ERS_RESULT_NONE:
1568 case PCI_ERS_RESULT_CAN_RECOVER:
1569 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1570 envp[idx++] = "DEVICE_ONLINE=0";
1571 break;
1572 case PCI_ERS_RESULT_RECOVERED:
1573 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1574 envp[idx++] = "DEVICE_ONLINE=1";
1575 break;
1576 case PCI_ERS_RESULT_DISCONNECT:
1577 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1578 envp[idx++] = "DEVICE_ONLINE=0";
1579 break;
1580 default:
1581 break;
1582 }
1583
1584 if (idx > 0) {
1585 envp[idx++] = NULL;
1586 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1587 }
1588}
1589#endif
1590
1591static int pci_bus_num_vf(struct device *dev)
1592{
1593 return pci_num_vf(to_pci_dev(dev));
1594}
1595
1596/**
1597 * pci_dma_configure - Setup DMA configuration
1598 * @dev: ptr to dev structure
1599 *
1600 * Function to update PCI devices's DMA configuration using the same
1601 * info from the OF node or ACPI node of host bridge's parent (if any).
1602 */
1603static int pci_dma_configure(struct device *dev)
1604{
1605 struct device *bridge;
1606 int ret = 0;
1607
1608 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1609
1610 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1611 bridge->parent->of_node) {
1612 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1613 } else if (has_acpi_companion(bridge)) {
1614 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1615
1616 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1617 }
1618
1619 pci_put_host_bridge_device(bridge);
1620 return ret;
1621}
1622
1623struct bus_type pci_bus_type = {
1624 .name = "pci",
1625 .match = pci_bus_match,
1626 .uevent = pci_uevent,
1627 .probe = pci_device_probe,
1628 .remove = pci_device_remove,
1629 .shutdown = pci_device_shutdown,
1630 .dev_groups = pci_dev_groups,
1631 .bus_groups = pci_bus_groups,
1632 .drv_groups = pci_drv_groups,
1633 .pm = PCI_PM_OPS_PTR,
1634 .num_vf = pci_bus_num_vf,
1635 .dma_configure = pci_dma_configure,
1636};
1637EXPORT_SYMBOL(pci_bus_type);
1638
1639#ifdef CONFIG_PCIEPORTBUS
1640static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1641{
1642 struct pcie_device *pciedev;
1643 struct pcie_port_service_driver *driver;
1644
1645 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1646 return 0;
1647
1648 pciedev = to_pcie_device(dev);
1649 driver = to_service_driver(drv);
1650
1651 if (driver->service != pciedev->service)
1652 return 0;
1653
1654 if (driver->port_type != PCIE_ANY_PORT &&
1655 driver->port_type != pci_pcie_type(pciedev->port))
1656 return 0;
1657
1658 return 1;
1659}
1660
1661struct bus_type pcie_port_bus_type = {
1662 .name = "pci_express",
1663 .match = pcie_port_bus_match,
1664};
1665EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1666#endif
1667
1668static int __init pci_driver_init(void)
1669{
1670 int ret;
1671
1672 ret = bus_register(&pci_bus_type);
1673 if (ret)
1674 return ret;
1675
1676#ifdef CONFIG_PCIEPORTBUS
1677 ret = bus_register(&pcie_port_bus_type);
1678 if (ret)
1679 return ret;
1680#endif
1681 dma_debug_add_bus(&pci_bus_type);
1682 return 0;
1683}
1684postcore_initcall(pci_driver_init);
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);