Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux/fpc-iii.git] / drivers / pci / pci-driver.c
blob79b1610a8bebe7c156125ccf877e8e3b50e58d2d
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 */
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"
24 struct pci_dynid {
25 struct list_head node;
26 struct pci_device_id id;
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
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.
44 * CONTEXT:
45 * Does GFP_KERNEL allocation.
47 * RETURNS:
48 * 0 on success, -errno on failure.
50 int 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)
56 struct pci_dynid *dynid;
58 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
59 if (!dynid)
60 return -ENOMEM;
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;
70 spin_lock(&drv->dynids.lock);
71 list_add_tail(&dynid->node, &drv->dynids.list);
72 spin_unlock(&drv->dynids.lock);
74 return driver_attach(&drv->driver);
76 EXPORT_SYMBOL_GPL(pci_add_dynid);
78 static void pci_free_dynids(struct pci_driver *drv)
80 struct pci_dynid *dynid, *n;
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);
87 spin_unlock(&drv->dynids.lock);
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
96 * Allow PCI IDs to be added to an existing driver via sysfs.
98 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
99 size_t count)
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;
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;
115 if (fields != 7) {
116 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
117 if (!pdev)
118 return -ENOMEM;
120 pdev->vendor = vendor;
121 pdev->device = device;
122 pdev->subsystem_vendor = subvendor;
123 pdev->subsystem_device = subdevice;
124 pdev->class = class;
126 if (pci_match_id(pdrv->id_table, pdev))
127 retval = -EEXIST;
129 kfree(pdev);
131 if (retval)
132 return retval;
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;
144 ids++;
146 if (retval) /* No match */
147 return retval;
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;
156 static DRIVER_ATTR_WO(new_id);
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
164 * Removes a dynamic pci device ID to this driver.
166 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
167 size_t count)
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;
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;
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;
196 spin_unlock(&pdrv->dynids.lock);
198 return retval;
200 static DRIVER_ATTR_WO(remove_id);
202 static struct attribute *pci_drv_attrs[] = {
203 &driver_attr_new_id.attr,
204 &driver_attr_remove_id.attr,
205 NULL,
207 ATTRIBUTE_GROUPS(pci_drv);
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.
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.
218 * Deprecated, don't use this as it will not catch any dynamic ids
219 * that a driver might want to check for.
221 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
222 struct pci_dev *dev)
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++;
231 return NULL;
233 EXPORT_SYMBOL(pci_match_id);
235 static 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,
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
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.
251 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
252 struct pci_dev *dev)
254 struct pci_dynid *dynid;
255 const struct pci_device_id *found_id = NULL;
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;
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;
269 spin_unlock(&drv->dynids.lock);
271 if (!found_id)
272 found_id = pci_match_id(drv->id_table, dev);
274 /* driver_override will always match, send a dummy id */
275 if (!found_id && dev->driver_override)
276 found_id = &pci_device_id_any;
278 return found_id;
281 struct drv_dev_and_id {
282 struct pci_driver *drv;
283 struct pci_dev *dev;
284 const struct pci_device_id *id;
287 static long local_pci_probe(void *_ddi)
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;
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.
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;
315 * Probe function should return < 0 for failure, 0 for success
316 * Treat values > 0 as success, but warn.
318 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
319 return 0;
322 static bool pci_physfn_is_probed(struct pci_dev *dev)
324 #ifdef CONFIG_PCI_IOV
325 return dev->is_virtfn && dev->physfn->is_probed;
326 #else
327 return false;
328 #endif
331 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
332 const struct pci_device_id *id)
334 int error, node, cpu;
335 struct drv_dev_and_id ddi = { drv, dev, id };
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.
342 node = dev_to_node(&dev->dev);
343 dev->is_probed = 1;
345 cpu_hotplug_disable();
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.
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);
357 if (cpu < nr_cpu_ids)
358 error = work_on_cpu(cpu, local_pci_probe, &ddi);
359 else
360 error = local_pci_probe(&ddi);
362 dev->is_probed = 0;
363 cpu_hotplug_enable();
364 return error;
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
372 * returns 0 on success, else error.
373 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
375 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
377 const struct pci_device_id *id;
378 int error = 0;
380 if (!pci_dev->driver && drv->probe) {
381 error = -ENODEV;
383 id = pci_match_device(drv, pci_dev);
384 if (id)
385 error = pci_call_probe(drv, pci_dev, id);
387 return error;
390 int __weak pcibios_alloc_irq(struct pci_dev *dev)
392 return 0;
395 void __weak pcibios_free_irq(struct pci_dev *dev)
399 #ifdef CONFIG_PCI_IOV
400 static inline bool pci_device_can_probe(struct pci_dev *pdev)
402 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe);
404 #else
405 static inline bool pci_device_can_probe(struct pci_dev *pdev)
407 return true;
409 #endif
411 static int pci_device_probe(struct device *dev)
413 int error;
414 struct pci_dev *pci_dev = to_pci_dev(dev);
415 struct pci_driver *drv = to_pci_driver(dev->driver);
417 pci_assign_irq(pci_dev);
419 error = pcibios_alloc_irq(pci_dev);
420 if (error < 0)
421 return error;
423 pci_dev_get(pci_dev);
424 if (pci_device_can_probe(pci_dev)) {
425 error = __pci_device_probe(drv, pci_dev);
426 if (error) {
427 pcibios_free_irq(pci_dev);
428 pci_dev_put(pci_dev);
432 return error;
435 static int pci_device_remove(struct device *dev)
437 struct pci_dev *pci_dev = to_pci_dev(dev);
438 struct pci_driver *drv = pci_dev->driver;
440 if (drv) {
441 if (drv->remove) {
442 pm_runtime_get_sync(dev);
443 drv->remove(pci_dev);
444 pm_runtime_put_noidle(dev);
446 pcibios_free_irq(pci_dev);
447 pci_dev->driver = NULL;
448 pci_iov_remove(pci_dev);
451 /* Undo the runtime PM settings in local_pci_probe() */
452 pm_runtime_put_sync(dev);
455 * If the device is still on, set the power state as "unknown",
456 * since it might change by the next time we load the driver.
458 if (pci_dev->current_state == PCI_D0)
459 pci_dev->current_state = PCI_UNKNOWN;
462 * We would love to complain here if pci_dev->is_enabled is set, that
463 * the driver should have called pci_disable_device(), but the
464 * unfortunate fact is there are too many odd BIOS and bridge setups
465 * that don't like drivers doing that all of the time.
466 * Oh well, we can dream of sane hardware when we sleep, no matter how
467 * horrible the crap we have to deal with is when we are awake...
470 pci_dev_put(pci_dev);
471 return 0;
474 static void pci_device_shutdown(struct device *dev)
476 struct pci_dev *pci_dev = to_pci_dev(dev);
477 struct pci_driver *drv = pci_dev->driver;
479 pm_runtime_resume(dev);
481 if (drv && drv->shutdown)
482 drv->shutdown(pci_dev);
485 * If this is a kexec reboot, turn off Bus Master bit on the
486 * device to tell it to not continue to do DMA. Don't touch
487 * devices in D3cold or unknown states.
488 * If it is not a kexec reboot, firmware will hit the PCI
489 * devices with big hammer and stop their DMA any way.
491 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
492 pci_clear_master(pci_dev);
495 #ifdef CONFIG_PM
497 /* Auxiliary functions used for system resume and run-time resume. */
500 * pci_restore_standard_config - restore standard config registers of PCI device
501 * @pci_dev: PCI device to handle
503 static int pci_restore_standard_config(struct pci_dev *pci_dev)
505 pci_update_current_state(pci_dev, PCI_UNKNOWN);
507 if (pci_dev->current_state != PCI_D0) {
508 int error = pci_set_power_state(pci_dev, PCI_D0);
509 if (error)
510 return error;
513 pci_restore_state(pci_dev);
514 pci_pme_restore(pci_dev);
515 return 0;
518 #endif
520 #ifdef CONFIG_PM_SLEEP
522 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
524 pci_power_up(pci_dev);
525 pci_restore_state(pci_dev);
526 pci_pme_restore(pci_dev);
527 pci_fixup_device(pci_fixup_resume_early, pci_dev);
531 * Default "suspend" method for devices that have no driver provided suspend,
532 * or not even a driver at all (second part).
534 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
537 * mark its power state as "unknown", since we don't know if
538 * e.g. the BIOS will change its device state when we suspend.
540 if (pci_dev->current_state == PCI_D0)
541 pci_dev->current_state = PCI_UNKNOWN;
545 * Default "resume" method for devices that have no driver provided resume,
546 * or not even a driver at all (second part).
548 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
550 int retval;
552 /* if the device was enabled before suspend, reenable */
553 retval = pci_reenable_device(pci_dev);
555 * if the device was busmaster before the suspend, make it busmaster
556 * again
558 if (pci_dev->is_busmaster)
559 pci_set_master(pci_dev);
561 return retval;
564 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
566 struct pci_dev *pci_dev = to_pci_dev(dev);
567 struct pci_driver *drv = pci_dev->driver;
569 if (drv && drv->suspend) {
570 pci_power_t prev = pci_dev->current_state;
571 int error;
573 error = drv->suspend(pci_dev, state);
574 suspend_report_result(drv->suspend, error);
575 if (error)
576 return error;
578 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
579 && pci_dev->current_state != PCI_UNKNOWN) {
580 WARN_ONCE(pci_dev->current_state != prev,
581 "PCI PM: Device state not saved by %pF\n",
582 drv->suspend);
586 pci_fixup_device(pci_fixup_suspend, pci_dev);
588 return 0;
591 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
593 struct pci_dev *pci_dev = to_pci_dev(dev);
594 struct pci_driver *drv = pci_dev->driver;
596 if (drv && drv->suspend_late) {
597 pci_power_t prev = pci_dev->current_state;
598 int error;
600 error = drv->suspend_late(pci_dev, state);
601 suspend_report_result(drv->suspend_late, error);
602 if (error)
603 return error;
605 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
606 && pci_dev->current_state != PCI_UNKNOWN) {
607 WARN_ONCE(pci_dev->current_state != prev,
608 "PCI PM: Device state not saved by %pF\n",
609 drv->suspend_late);
610 goto Fixup;
614 if (!pci_dev->state_saved)
615 pci_save_state(pci_dev);
617 pci_pm_set_unknown_state(pci_dev);
619 Fixup:
620 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
622 return 0;
625 static int pci_legacy_resume_early(struct device *dev)
627 struct pci_dev *pci_dev = to_pci_dev(dev);
628 struct pci_driver *drv = pci_dev->driver;
630 return drv && drv->resume_early ?
631 drv->resume_early(pci_dev) : 0;
634 static int pci_legacy_resume(struct device *dev)
636 struct pci_dev *pci_dev = to_pci_dev(dev);
637 struct pci_driver *drv = pci_dev->driver;
639 pci_fixup_device(pci_fixup_resume, pci_dev);
641 return drv && drv->resume ?
642 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
645 /* Auxiliary functions used by the new power management framework */
647 static void pci_pm_default_resume(struct pci_dev *pci_dev)
649 pci_fixup_device(pci_fixup_resume, pci_dev);
650 pci_enable_wake(pci_dev, PCI_D0, false);
653 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
655 /* Disable non-bridge devices without PM support */
656 if (!pci_has_subordinate(pci_dev))
657 pci_disable_enabled_device(pci_dev);
660 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
662 struct pci_driver *drv = pci_dev->driver;
663 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
664 || drv->resume_early);
667 * Legacy PM support is used by default, so warn if the new framework is
668 * supported as well. Drivers are supposed to support either the
669 * former, or the latter, but not both at the same time.
671 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
672 drv->name, pci_dev->vendor, pci_dev->device);
674 return ret;
677 /* New power management framework */
679 static int pci_pm_prepare(struct device *dev)
681 struct device_driver *drv = dev->driver;
683 if (drv && drv->pm && drv->pm->prepare) {
684 int error = drv->pm->prepare(dev);
685 if (error < 0)
686 return error;
688 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
689 return 0;
691 return pci_dev_keep_suspended(to_pci_dev(dev));
694 static void pci_pm_complete(struct device *dev)
696 struct pci_dev *pci_dev = to_pci_dev(dev);
698 pci_dev_complete_resume(pci_dev);
699 pm_generic_complete(dev);
701 /* Resume device if platform firmware has put it in reset-power-on */
702 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
703 pci_power_t pre_sleep_state = pci_dev->current_state;
705 pci_update_current_state(pci_dev, pci_dev->current_state);
706 if (pci_dev->current_state < pre_sleep_state)
707 pm_request_resume(dev);
711 #else /* !CONFIG_PM_SLEEP */
713 #define pci_pm_prepare NULL
714 #define pci_pm_complete NULL
716 #endif /* !CONFIG_PM_SLEEP */
718 #ifdef CONFIG_SUSPEND
719 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
722 * Some BIOSes forget to clear Root PME Status bits after system
723 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
724 * Clear those bits now just in case (shouldn't hurt).
726 if (pci_is_pcie(pci_dev) &&
727 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
728 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
729 pcie_clear_root_pme_status(pci_dev);
732 static int pci_pm_suspend(struct device *dev)
734 struct pci_dev *pci_dev = to_pci_dev(dev);
735 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
737 if (pci_has_legacy_pm_support(pci_dev))
738 return pci_legacy_suspend(dev, PMSG_SUSPEND);
740 if (!pm) {
741 pci_pm_default_suspend(pci_dev);
742 return 0;
746 * PCI devices suspended at run time may need to be resumed at this
747 * point, because in general it may be necessary to reconfigure them for
748 * system suspend. Namely, if the device is expected to wake up the
749 * system from the sleep state, it may have to be reconfigured for this
750 * purpose, or if the device is not expected to wake up the system from
751 * the sleep state, it should be prevented from signaling wakeup events
752 * going forward.
754 * Also if the driver of the device does not indicate that its system
755 * suspend callbacks can cope with runtime-suspended devices, it is
756 * better to resume the device from runtime suspend here.
758 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
759 !pci_dev_keep_suspended(pci_dev)) {
760 pm_runtime_resume(dev);
761 pci_dev->state_saved = false;
764 if (pm->suspend) {
765 pci_power_t prev = pci_dev->current_state;
766 int error;
768 error = pm->suspend(dev);
769 suspend_report_result(pm->suspend, error);
770 if (error)
771 return error;
773 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
774 && pci_dev->current_state != PCI_UNKNOWN) {
775 WARN_ONCE(pci_dev->current_state != prev,
776 "PCI PM: State of device not saved by %pF\n",
777 pm->suspend);
781 return 0;
784 static int pci_pm_suspend_late(struct device *dev)
786 if (dev_pm_smart_suspend_and_suspended(dev))
787 return 0;
789 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
791 return pm_generic_suspend_late(dev);
794 static int pci_pm_suspend_noirq(struct device *dev)
796 struct pci_dev *pci_dev = to_pci_dev(dev);
797 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
799 if (dev_pm_smart_suspend_and_suspended(dev)) {
800 dev->power.may_skip_resume = true;
801 return 0;
804 if (pci_has_legacy_pm_support(pci_dev))
805 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
807 if (!pm) {
808 pci_save_state(pci_dev);
809 goto Fixup;
812 if (pm->suspend_noirq) {
813 pci_power_t prev = pci_dev->current_state;
814 int error;
816 error = pm->suspend_noirq(dev);
817 suspend_report_result(pm->suspend_noirq, error);
818 if (error)
819 return error;
821 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
822 && pci_dev->current_state != PCI_UNKNOWN) {
823 WARN_ONCE(pci_dev->current_state != prev,
824 "PCI PM: State of device not saved by %pF\n",
825 pm->suspend_noirq);
826 goto Fixup;
830 if (!pci_dev->state_saved) {
831 pci_save_state(pci_dev);
832 if (pci_power_manageable(pci_dev))
833 pci_prepare_to_sleep(pci_dev);
836 dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
837 pci_power_name(pci_dev->current_state));
839 pci_pm_set_unknown_state(pci_dev);
842 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
843 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
844 * hasn't been quiesced and tries to turn it off. If the controller
845 * is already in D3, this can hang or cause memory corruption.
847 * Since the value of the COMMAND register doesn't matter once the
848 * device has been suspended, we can safely set it to 0 here.
850 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
851 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
853 Fixup:
854 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
857 * If the target system sleep state is suspend-to-idle, it is sufficient
858 * to check whether or not the device's wakeup settings are good for
859 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
860 * pci_pm_complete() to take care of fixing up the device's state
861 * anyway, if need be.
863 dev->power.may_skip_resume = device_may_wakeup(dev) ||
864 !device_can_wakeup(dev);
866 return 0;
869 static int pci_pm_resume_noirq(struct device *dev)
871 struct pci_dev *pci_dev = to_pci_dev(dev);
872 struct device_driver *drv = dev->driver;
873 int error = 0;
875 if (dev_pm_may_skip_resume(dev))
876 return 0;
879 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
880 * during system suspend, so update their runtime PM status to "active"
881 * as they are going to be put into D0 shortly.
883 if (dev_pm_smart_suspend_and_suspended(dev))
884 pm_runtime_set_active(dev);
886 pci_pm_default_resume_early(pci_dev);
888 if (pci_has_legacy_pm_support(pci_dev))
889 return pci_legacy_resume_early(dev);
891 pcie_pme_root_status_cleanup(pci_dev);
893 if (drv && drv->pm && drv->pm->resume_noirq)
894 error = drv->pm->resume_noirq(dev);
896 return error;
899 static int pci_pm_resume(struct device *dev)
901 struct pci_dev *pci_dev = to_pci_dev(dev);
902 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
903 int error = 0;
906 * This is necessary for the suspend error path in which resume is
907 * called without restoring the standard config registers of the device.
909 if (pci_dev->state_saved)
910 pci_restore_standard_config(pci_dev);
912 if (pci_has_legacy_pm_support(pci_dev))
913 return pci_legacy_resume(dev);
915 pci_pm_default_resume(pci_dev);
917 if (pm) {
918 if (pm->resume)
919 error = pm->resume(dev);
920 } else {
921 pci_pm_reenable_device(pci_dev);
924 return error;
927 #else /* !CONFIG_SUSPEND */
929 #define pci_pm_suspend NULL
930 #define pci_pm_suspend_late NULL
931 #define pci_pm_suspend_noirq NULL
932 #define pci_pm_resume NULL
933 #define pci_pm_resume_noirq NULL
935 #endif /* !CONFIG_SUSPEND */
937 #ifdef CONFIG_HIBERNATE_CALLBACKS
941 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
942 * a hibernate transition
944 struct dev_pm_ops __weak pcibios_pm_ops;
946 static int pci_pm_freeze(struct device *dev)
948 struct pci_dev *pci_dev = to_pci_dev(dev);
949 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
951 if (pci_has_legacy_pm_support(pci_dev))
952 return pci_legacy_suspend(dev, PMSG_FREEZE);
954 if (!pm) {
955 pci_pm_default_suspend(pci_dev);
956 return 0;
960 * This used to be done in pci_pm_prepare() for all devices and some
961 * drivers may depend on it, so do it here. Ideally, runtime-suspended
962 * devices should not be touched during freeze/thaw transitions,
963 * however.
965 if (!dev_pm_smart_suspend_and_suspended(dev)) {
966 pm_runtime_resume(dev);
967 pci_dev->state_saved = false;
970 if (pm->freeze) {
971 int error;
973 error = pm->freeze(dev);
974 suspend_report_result(pm->freeze, error);
975 if (error)
976 return error;
979 return 0;
982 static int pci_pm_freeze_late(struct device *dev)
984 if (dev_pm_smart_suspend_and_suspended(dev))
985 return 0;
987 return pm_generic_freeze_late(dev);
990 static int pci_pm_freeze_noirq(struct device *dev)
992 struct pci_dev *pci_dev = to_pci_dev(dev);
993 struct device_driver *drv = dev->driver;
995 if (dev_pm_smart_suspend_and_suspended(dev))
996 return 0;
998 if (pci_has_legacy_pm_support(pci_dev))
999 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1001 if (drv && drv->pm && drv->pm->freeze_noirq) {
1002 int error;
1004 error = drv->pm->freeze_noirq(dev);
1005 suspend_report_result(drv->pm->freeze_noirq, error);
1006 if (error)
1007 return error;
1010 if (!pci_dev->state_saved)
1011 pci_save_state(pci_dev);
1013 pci_pm_set_unknown_state(pci_dev);
1015 if (pcibios_pm_ops.freeze_noirq)
1016 return pcibios_pm_ops.freeze_noirq(dev);
1018 return 0;
1021 static int pci_pm_thaw_noirq(struct device *dev)
1023 struct pci_dev *pci_dev = to_pci_dev(dev);
1024 struct device_driver *drv = dev->driver;
1025 int error = 0;
1028 * If the device is in runtime suspend, the code below may not work
1029 * correctly with it, so skip that code and make the PM core skip all of
1030 * the subsequent "thaw" callbacks for the device.
1032 if (dev_pm_smart_suspend_and_suspended(dev)) {
1033 dev_pm_skip_next_resume_phases(dev);
1034 return 0;
1037 if (pcibios_pm_ops.thaw_noirq) {
1038 error = pcibios_pm_ops.thaw_noirq(dev);
1039 if (error)
1040 return error;
1043 if (pci_has_legacy_pm_support(pci_dev))
1044 return pci_legacy_resume_early(dev);
1047 * pci_restore_state() requires the device to be in D0 (because of MSI
1048 * restoration among other things), so force it into D0 in case the
1049 * driver's "freeze" callbacks put it into a low-power state directly.
1051 pci_set_power_state(pci_dev, PCI_D0);
1052 pci_restore_state(pci_dev);
1054 if (drv && drv->pm && drv->pm->thaw_noirq)
1055 error = drv->pm->thaw_noirq(dev);
1057 return error;
1060 static int pci_pm_thaw(struct device *dev)
1062 struct pci_dev *pci_dev = to_pci_dev(dev);
1063 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1064 int error = 0;
1066 if (pci_has_legacy_pm_support(pci_dev))
1067 return pci_legacy_resume(dev);
1069 if (pm) {
1070 if (pm->thaw)
1071 error = pm->thaw(dev);
1072 } else {
1073 pci_pm_reenable_device(pci_dev);
1076 pci_dev->state_saved = false;
1078 return error;
1081 static int pci_pm_poweroff(struct device *dev)
1083 struct pci_dev *pci_dev = to_pci_dev(dev);
1084 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1086 if (pci_has_legacy_pm_support(pci_dev))
1087 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1089 if (!pm) {
1090 pci_pm_default_suspend(pci_dev);
1091 return 0;
1094 /* The reason to do that is the same as in pci_pm_suspend(). */
1095 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1096 !pci_dev_keep_suspended(pci_dev))
1097 pm_runtime_resume(dev);
1099 pci_dev->state_saved = false;
1100 if (pm->poweroff) {
1101 int error;
1103 error = pm->poweroff(dev);
1104 suspend_report_result(pm->poweroff, error);
1105 if (error)
1106 return error;
1109 return 0;
1112 static int pci_pm_poweroff_late(struct device *dev)
1114 if (dev_pm_smart_suspend_and_suspended(dev))
1115 return 0;
1117 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1119 return pm_generic_poweroff_late(dev);
1122 static int pci_pm_poweroff_noirq(struct device *dev)
1124 struct pci_dev *pci_dev = to_pci_dev(dev);
1125 struct device_driver *drv = dev->driver;
1127 if (dev_pm_smart_suspend_and_suspended(dev))
1128 return 0;
1130 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1131 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1133 if (!drv || !drv->pm) {
1134 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1135 return 0;
1138 if (drv->pm->poweroff_noirq) {
1139 int error;
1141 error = drv->pm->poweroff_noirq(dev);
1142 suspend_report_result(drv->pm->poweroff_noirq, error);
1143 if (error)
1144 return error;
1147 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1148 pci_prepare_to_sleep(pci_dev);
1151 * The reason for doing this here is the same as for the analogous code
1152 * in pci_pm_suspend_noirq().
1154 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1155 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1157 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1159 if (pcibios_pm_ops.poweroff_noirq)
1160 return pcibios_pm_ops.poweroff_noirq(dev);
1162 return 0;
1165 static int pci_pm_restore_noirq(struct device *dev)
1167 struct pci_dev *pci_dev = to_pci_dev(dev);
1168 struct device_driver *drv = dev->driver;
1169 int error = 0;
1171 /* This is analogous to the pci_pm_resume_noirq() case. */
1172 if (dev_pm_smart_suspend_and_suspended(dev))
1173 pm_runtime_set_active(dev);
1175 if (pcibios_pm_ops.restore_noirq) {
1176 error = pcibios_pm_ops.restore_noirq(dev);
1177 if (error)
1178 return error;
1181 pci_pm_default_resume_early(pci_dev);
1183 if (pci_has_legacy_pm_support(pci_dev))
1184 return pci_legacy_resume_early(dev);
1186 if (drv && drv->pm && drv->pm->restore_noirq)
1187 error = drv->pm->restore_noirq(dev);
1189 return error;
1192 static int pci_pm_restore(struct device *dev)
1194 struct pci_dev *pci_dev = to_pci_dev(dev);
1195 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1196 int error = 0;
1199 * This is necessary for the hibernation error path in which restore is
1200 * called without restoring the standard config registers of the device.
1202 if (pci_dev->state_saved)
1203 pci_restore_standard_config(pci_dev);
1205 if (pci_has_legacy_pm_support(pci_dev))
1206 return pci_legacy_resume(dev);
1208 pci_pm_default_resume(pci_dev);
1210 if (pm) {
1211 if (pm->restore)
1212 error = pm->restore(dev);
1213 } else {
1214 pci_pm_reenable_device(pci_dev);
1217 return error;
1220 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1222 #define pci_pm_freeze NULL
1223 #define pci_pm_freeze_late NULL
1224 #define pci_pm_freeze_noirq NULL
1225 #define pci_pm_thaw NULL
1226 #define pci_pm_thaw_noirq NULL
1227 #define pci_pm_poweroff NULL
1228 #define pci_pm_poweroff_late NULL
1229 #define pci_pm_poweroff_noirq NULL
1230 #define pci_pm_restore NULL
1231 #define pci_pm_restore_noirq NULL
1233 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1235 #ifdef CONFIG_PM
1237 static int pci_pm_runtime_suspend(struct device *dev)
1239 struct pci_dev *pci_dev = to_pci_dev(dev);
1240 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1241 pci_power_t prev = pci_dev->current_state;
1242 int error;
1245 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1246 * but it may go to D3cold when the bridge above it runtime suspends.
1247 * Save its config space in case that happens.
1249 if (!pci_dev->driver) {
1250 pci_save_state(pci_dev);
1251 return 0;
1254 pci_dev->state_saved = false;
1255 if (pm && pm->runtime_suspend) {
1256 error = pm->runtime_suspend(dev);
1258 * -EBUSY and -EAGAIN is used to request the runtime PM core
1259 * to schedule a new suspend, so log the event only with debug
1260 * log level.
1262 if (error == -EBUSY || error == -EAGAIN) {
1263 dev_dbg(dev, "can't suspend now (%pf returned %d)\n",
1264 pm->runtime_suspend, error);
1265 return error;
1266 } else if (error) {
1267 dev_err(dev, "can't suspend (%pf returned %d)\n",
1268 pm->runtime_suspend, error);
1269 return error;
1273 pci_fixup_device(pci_fixup_suspend, pci_dev);
1275 if (pm && pm->runtime_suspend
1276 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1277 && pci_dev->current_state != PCI_UNKNOWN) {
1278 WARN_ONCE(pci_dev->current_state != prev,
1279 "PCI PM: State of device not saved by %pF\n",
1280 pm->runtime_suspend);
1281 return 0;
1284 if (!pci_dev->state_saved) {
1285 pci_save_state(pci_dev);
1286 pci_finish_runtime_suspend(pci_dev);
1289 return 0;
1292 static int pci_pm_runtime_resume(struct device *dev)
1294 int rc = 0;
1295 struct pci_dev *pci_dev = to_pci_dev(dev);
1296 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1299 * Restoring config space is necessary even if the device is not bound
1300 * to a driver because although we left it in D0, it may have gone to
1301 * D3cold when the bridge above it runtime suspended.
1303 pci_restore_standard_config(pci_dev);
1305 if (!pci_dev->driver)
1306 return 0;
1308 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1309 pci_enable_wake(pci_dev, PCI_D0, false);
1310 pci_fixup_device(pci_fixup_resume, pci_dev);
1312 if (pm && pm->runtime_resume)
1313 rc = pm->runtime_resume(dev);
1315 pci_dev->runtime_d3cold = false;
1317 return rc;
1320 static int pci_pm_runtime_idle(struct device *dev)
1322 struct pci_dev *pci_dev = to_pci_dev(dev);
1323 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1324 int ret = 0;
1327 * If pci_dev->driver is not set (unbound), the device should
1328 * always remain in D0 regardless of the runtime PM status
1330 if (!pci_dev->driver)
1331 return 0;
1333 if (!pm)
1334 return -ENOSYS;
1336 if (pm->runtime_idle)
1337 ret = pm->runtime_idle(dev);
1339 return ret;
1342 static const struct dev_pm_ops pci_dev_pm_ops = {
1343 .prepare = pci_pm_prepare,
1344 .complete = pci_pm_complete,
1345 .suspend = pci_pm_suspend,
1346 .suspend_late = pci_pm_suspend_late,
1347 .resume = pci_pm_resume,
1348 .freeze = pci_pm_freeze,
1349 .freeze_late = pci_pm_freeze_late,
1350 .thaw = pci_pm_thaw,
1351 .poweroff = pci_pm_poweroff,
1352 .poweroff_late = pci_pm_poweroff_late,
1353 .restore = pci_pm_restore,
1354 .suspend_noirq = pci_pm_suspend_noirq,
1355 .resume_noirq = pci_pm_resume_noirq,
1356 .freeze_noirq = pci_pm_freeze_noirq,
1357 .thaw_noirq = pci_pm_thaw_noirq,
1358 .poweroff_noirq = pci_pm_poweroff_noirq,
1359 .restore_noirq = pci_pm_restore_noirq,
1360 .runtime_suspend = pci_pm_runtime_suspend,
1361 .runtime_resume = pci_pm_runtime_resume,
1362 .runtime_idle = pci_pm_runtime_idle,
1365 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1367 #else /* !CONFIG_PM */
1369 #define pci_pm_runtime_suspend NULL
1370 #define pci_pm_runtime_resume NULL
1371 #define pci_pm_runtime_idle NULL
1373 #define PCI_PM_OPS_PTR NULL
1375 #endif /* !CONFIG_PM */
1378 * __pci_register_driver - register a new pci driver
1379 * @drv: the driver structure to register
1380 * @owner: owner module of drv
1381 * @mod_name: module name string
1383 * Adds the driver structure to the list of registered drivers.
1384 * Returns a negative value on error, otherwise 0.
1385 * If no error occurred, the driver remains registered even if
1386 * no device was claimed during registration.
1388 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1389 const char *mod_name)
1391 /* initialize common driver fields */
1392 drv->driver.name = drv->name;
1393 drv->driver.bus = &pci_bus_type;
1394 drv->driver.owner = owner;
1395 drv->driver.mod_name = mod_name;
1396 drv->driver.groups = drv->groups;
1398 spin_lock_init(&drv->dynids.lock);
1399 INIT_LIST_HEAD(&drv->dynids.list);
1401 /* register with core */
1402 return driver_register(&drv->driver);
1404 EXPORT_SYMBOL(__pci_register_driver);
1407 * pci_unregister_driver - unregister a pci driver
1408 * @drv: the driver structure to unregister
1410 * Deletes the driver structure from the list of registered PCI drivers,
1411 * gives it a chance to clean up by calling its remove() function for
1412 * each device it was responsible for, and marks those devices as
1413 * driverless.
1416 void pci_unregister_driver(struct pci_driver *drv)
1418 driver_unregister(&drv->driver);
1419 pci_free_dynids(drv);
1421 EXPORT_SYMBOL(pci_unregister_driver);
1423 static struct pci_driver pci_compat_driver = {
1424 .name = "compat"
1428 * pci_dev_driver - get the pci_driver of a device
1429 * @dev: the device to query
1431 * Returns the appropriate pci_driver structure or %NULL if there is no
1432 * registered driver for the device.
1434 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1436 if (dev->driver)
1437 return dev->driver;
1438 else {
1439 int i;
1440 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1441 if (dev->resource[i].flags & IORESOURCE_BUSY)
1442 return &pci_compat_driver;
1444 return NULL;
1446 EXPORT_SYMBOL(pci_dev_driver);
1449 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1450 * @dev: the PCI device structure to match against
1451 * @drv: the device driver to search for matching PCI device id structures
1453 * Used by a driver to check whether a PCI device present in the
1454 * system is in its list of supported devices. Returns the matching
1455 * pci_device_id structure or %NULL if there is no match.
1457 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1459 struct pci_dev *pci_dev = to_pci_dev(dev);
1460 struct pci_driver *pci_drv;
1461 const struct pci_device_id *found_id;
1463 if (!pci_dev->match_driver)
1464 return 0;
1466 pci_drv = to_pci_driver(drv);
1467 found_id = pci_match_device(pci_drv, pci_dev);
1468 if (found_id)
1469 return 1;
1471 return 0;
1475 * pci_dev_get - increments the reference count of the pci device structure
1476 * @dev: the device being referenced
1478 * Each live reference to a device should be refcounted.
1480 * Drivers for PCI devices should normally record such references in
1481 * their probe() methods, when they bind to a device, and release
1482 * them by calling pci_dev_put(), in their disconnect() methods.
1484 * A pointer to the device with the incremented reference counter is returned.
1486 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1488 if (dev)
1489 get_device(&dev->dev);
1490 return dev;
1492 EXPORT_SYMBOL(pci_dev_get);
1495 * pci_dev_put - release a use of the pci device structure
1496 * @dev: device that's been disconnected
1498 * Must be called when a user of a device is finished with it. When the last
1499 * user of the device calls this function, the memory of the device is freed.
1501 void pci_dev_put(struct pci_dev *dev)
1503 if (dev)
1504 put_device(&dev->dev);
1506 EXPORT_SYMBOL(pci_dev_put);
1508 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1510 struct pci_dev *pdev;
1512 if (!dev)
1513 return -ENODEV;
1515 pdev = to_pci_dev(dev);
1517 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1518 return -ENOMEM;
1520 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1521 return -ENOMEM;
1523 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1524 pdev->subsystem_device))
1525 return -ENOMEM;
1527 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1528 return -ENOMEM;
1530 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1531 pdev->vendor, pdev->device,
1532 pdev->subsystem_vendor, pdev->subsystem_device,
1533 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1534 (u8)(pdev->class)))
1535 return -ENOMEM;
1537 return 0;
1540 #if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
1542 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1543 * @pdev: PCI device undergoing error recovery
1544 * @err_type: type of error event
1546 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1548 int idx = 0;
1549 char *envp[3];
1551 switch (err_type) {
1552 case PCI_ERS_RESULT_NONE:
1553 case PCI_ERS_RESULT_CAN_RECOVER:
1554 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1555 envp[idx++] = "DEVICE_ONLINE=0";
1556 break;
1557 case PCI_ERS_RESULT_RECOVERED:
1558 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1559 envp[idx++] = "DEVICE_ONLINE=1";
1560 break;
1561 case PCI_ERS_RESULT_DISCONNECT:
1562 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1563 envp[idx++] = "DEVICE_ONLINE=0";
1564 break;
1565 default:
1566 break;
1569 if (idx > 0) {
1570 envp[idx++] = NULL;
1571 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1574 #endif
1576 static int pci_bus_num_vf(struct device *dev)
1578 return pci_num_vf(to_pci_dev(dev));
1582 * pci_dma_configure - Setup DMA configuration
1583 * @dev: ptr to dev structure
1585 * Function to update PCI devices's DMA configuration using the same
1586 * info from the OF node or ACPI node of host bridge's parent (if any).
1588 static int pci_dma_configure(struct device *dev)
1590 struct device *bridge;
1591 int ret = 0;
1593 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1595 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1596 bridge->parent->of_node) {
1597 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1598 } else if (has_acpi_companion(bridge)) {
1599 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1601 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1604 pci_put_host_bridge_device(bridge);
1605 return ret;
1608 struct bus_type pci_bus_type = {
1609 .name = "pci",
1610 .match = pci_bus_match,
1611 .uevent = pci_uevent,
1612 .probe = pci_device_probe,
1613 .remove = pci_device_remove,
1614 .shutdown = pci_device_shutdown,
1615 .dev_groups = pci_dev_groups,
1616 .bus_groups = pci_bus_groups,
1617 .drv_groups = pci_drv_groups,
1618 .pm = PCI_PM_OPS_PTR,
1619 .num_vf = pci_bus_num_vf,
1620 .dma_configure = pci_dma_configure,
1622 EXPORT_SYMBOL(pci_bus_type);
1624 #ifdef CONFIG_PCIEPORTBUS
1625 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1627 struct pcie_device *pciedev;
1628 struct pcie_port_service_driver *driver;
1630 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1631 return 0;
1633 pciedev = to_pcie_device(dev);
1634 driver = to_service_driver(drv);
1636 if (driver->service != pciedev->service)
1637 return 0;
1639 if (driver->port_type != PCIE_ANY_PORT &&
1640 driver->port_type != pci_pcie_type(pciedev->port))
1641 return 0;
1643 return 1;
1646 struct bus_type pcie_port_bus_type = {
1647 .name = "pci_express",
1648 .match = pcie_port_bus_match,
1650 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1651 #endif
1653 static int __init pci_driver_init(void)
1655 int ret;
1657 ret = bus_register(&pci_bus_type);
1658 if (ret)
1659 return ret;
1661 #ifdef CONFIG_PCIEPORTBUS
1662 ret = bus_register(&pcie_port_bus_type);
1663 if (ret)
1664 return ret;
1665 #endif
1666 dma_debug_add_bus(&pci_bus_type);
1667 return 0;
1669 postcore_initcall(pci_driver_init);