2 * drivers/pci/pci-driver.c
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
7 * Released under the GPL v2 only.
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>
26 struct list_head node;
27 struct pci_device_id id;
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
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
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.
46 * Does GFP_KERNEL allocation.
49 * 0 on success, -errno on failure.
51 int 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)
57 struct pci_dynid *dynid;
60 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
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;
72 spin_lock(&drv->dynids.lock);
73 list_add_tail(&dynid->node, &drv->dynids.list);
74 spin_unlock(&drv->dynids.lock);
76 retval = driver_attach(&drv->driver);
81 static void pci_free_dynids(struct pci_driver *drv)
83 struct pci_dynid *dynid, *n;
85 spin_lock(&drv->dynids.lock);
86 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 list_del(&dynid->node);
90 spin_unlock(&drv->dynids.lock);
94 * store_new_id - sysfs frontend to pci_add_dynid()
95 * @driver: target device driver
96 * @buf: buffer for scanning device ID data
99 * Allow PCI IDs to be added to an existing driver via sysfs.
102 store_new_id(struct device_driver *driver, const char *buf, size_t count)
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;
112 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
113 &vendor, &device, &subvendor, &subdevice,
114 &class, &class_mask, &driver_data);
119 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
123 pdev->vendor = vendor;
124 pdev->device = device;
125 pdev->subsystem_vendor = subvendor;
126 pdev->subsystem_device = subdevice;
129 if (pci_match_id(pdrv->id_table, pdev))
138 /* Only accept driver_data values that match an existing id_table
142 while (ids->vendor || ids->subvendor || ids->class_mask) {
143 if (driver_data == ids->driver_data) {
149 if (retval) /* No match */
153 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
154 class, class_mask, driver_data);
159 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
162 * store_remove_id - remove a PCI device ID from this driver
163 * @driver: target device driver
164 * @buf: buffer for scanning device ID data
167 * Removes a dynamic pci device ID to this driver.
170 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
172 struct pci_dynid *dynid, *n;
173 struct pci_driver *pdrv = to_pci_driver(driver);
174 __u32 vendor, device, subvendor = PCI_ANY_ID,
175 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
177 int retval = -ENODEV;
179 fields = sscanf(buf, "%x %x %x %x %x %x",
180 &vendor, &device, &subvendor, &subdevice,
181 &class, &class_mask);
185 spin_lock(&pdrv->dynids.lock);
186 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
187 struct pci_device_id *id = &dynid->id;
188 if ((id->vendor == vendor) &&
189 (id->device == device) &&
190 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
191 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
192 !((id->class ^ class) & class_mask)) {
193 list_del(&dynid->node);
199 spin_unlock(&pdrv->dynids.lock);
205 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
207 static struct attribute *pci_drv_attrs[] = {
208 &driver_attr_new_id.attr,
209 &driver_attr_remove_id.attr,
212 ATTRIBUTE_GROUPS(pci_drv);
215 * pci_match_id - See if a pci device matches a given pci_id table
216 * @ids: array of PCI device id structures to search in
217 * @dev: the PCI device structure to match against.
219 * Used by a driver to check whether a PCI device present in the
220 * system is in its list of supported devices. Returns the matching
221 * pci_device_id structure or %NULL if there is no match.
223 * Deprecated, don't use this as it will not catch any dynamic ids
224 * that a driver might want to check for.
226 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
230 while (ids->vendor || ids->subvendor || ids->class_mask) {
231 if (pci_match_one_device(ids, dev))
239 static const struct pci_device_id pci_device_id_any = {
240 .vendor = PCI_ANY_ID,
241 .device = PCI_ANY_ID,
242 .subvendor = PCI_ANY_ID,
243 .subdevice = PCI_ANY_ID,
247 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
248 * @drv: the PCI driver to match against
249 * @dev: the PCI device structure to match against
251 * Used by a driver to check whether a PCI device present in the
252 * system is in its list of supported devices. Returns the matching
253 * pci_device_id structure or %NULL if there is no match.
255 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
258 struct pci_dynid *dynid;
259 const struct pci_device_id *found_id = NULL;
261 /* When driver_override is set, only bind to the matching driver */
262 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
265 /* Look at the dynamic ids first, before the static ones */
266 spin_lock(&drv->dynids.lock);
267 list_for_each_entry(dynid, &drv->dynids.list, node) {
268 if (pci_match_one_device(&dynid->id, dev)) {
269 found_id = &dynid->id;
273 spin_unlock(&drv->dynids.lock);
276 found_id = pci_match_id(drv->id_table, dev);
278 /* driver_override will always match, send a dummy id */
279 if (!found_id && dev->driver_override)
280 found_id = &pci_device_id_any;
285 struct drv_dev_and_id {
286 struct pci_driver *drv;
288 const struct pci_device_id *id;
291 static long local_pci_probe(void *_ddi)
293 struct drv_dev_and_id *ddi = _ddi;
294 struct pci_dev *pci_dev = ddi->dev;
295 struct pci_driver *pci_drv = ddi->drv;
296 struct device *dev = &pci_dev->dev;
300 * Unbound PCI devices are always put in D0, regardless of
301 * runtime PM status. During probe, the device is set to
302 * active and the usage count is incremented. If the driver
303 * supports runtime PM, it should call pm_runtime_put_noidle()
304 * in its probe routine and pm_runtime_get_noresume() in its
307 pm_runtime_get_sync(dev);
308 pci_dev->driver = pci_drv;
309 rc = pci_drv->probe(pci_dev, ddi->id);
313 pci_dev->driver = NULL;
314 pm_runtime_put_sync(dev);
318 * Probe function should return < 0 for failure, 0 for success
319 * Treat values > 0 as success, but warn.
321 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
325 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
326 const struct pci_device_id *id)
329 struct drv_dev_and_id ddi = { drv, dev, id };
332 * Execute driver initialization on node where the device is
333 * attached. This way the driver likely allocates its local memory
336 node = dev_to_node(&dev->dev);
339 * On NUMA systems, we are likely to call a PF probe function using
340 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
341 * adds the VF devices via pci_bus_add_device()), we may re-enter
342 * this function to call the VF probe function. Calling
343 * work_on_cpu() again will cause a lockdep warning. Since VFs are
344 * always on the same node as the PF, we can work around this by
345 * avoiding work_on_cpu() when we're already on the correct node.
347 * Preemption is enabled, so it's theoretically unsafe to use
348 * numa_node_id(), but even if we run the probe function on the
349 * wrong node, it should be functionally correct.
351 if (node >= 0 && node != numa_node_id()) {
355 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
356 if (cpu < nr_cpu_ids)
357 error = work_on_cpu(cpu, local_pci_probe, &ddi);
359 error = local_pci_probe(&ddi);
362 error = local_pci_probe(&ddi);
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.
376 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
378 const struct pci_device_id *id;
381 if (!pci_dev->driver && drv->probe) {
384 id = pci_match_device(drv, pci_dev);
386 error = pci_call_probe(drv, pci_dev, id);
393 static int pci_device_probe(struct device * dev)
396 struct pci_driver *drv;
397 struct pci_dev *pci_dev;
399 drv = to_pci_driver(dev->driver);
400 pci_dev = to_pci_dev(dev);
401 pci_dev_get(pci_dev);
402 error = __pci_device_probe(drv, pci_dev);
404 pci_dev_put(pci_dev);
409 static int pci_device_remove(struct device * dev)
411 struct pci_dev * pci_dev = to_pci_dev(dev);
412 struct pci_driver * drv = pci_dev->driver;
416 pm_runtime_get_sync(dev);
417 drv->remove(pci_dev);
418 pm_runtime_put_noidle(dev);
420 pci_dev->driver = NULL;
423 /* Undo the runtime PM settings in local_pci_probe() */
424 pm_runtime_put_sync(dev);
427 * If the device is still on, set the power state as "unknown",
428 * since it might change by the next time we load the driver.
430 if (pci_dev->current_state == PCI_D0)
431 pci_dev->current_state = PCI_UNKNOWN;
434 * We would love to complain here if pci_dev->is_enabled is set, that
435 * the driver should have called pci_disable_device(), but the
436 * unfortunate fact is there are too many odd BIOS and bridge setups
437 * that don't like drivers doing that all of the time.
438 * Oh well, we can dream of sane hardware when we sleep, no matter how
439 * horrible the crap we have to deal with is when we are awake...
442 pci_dev_put(pci_dev);
446 static void pci_device_shutdown(struct device *dev)
448 struct pci_dev *pci_dev = to_pci_dev(dev);
449 struct pci_driver *drv = pci_dev->driver;
451 pm_runtime_resume(dev);
453 if (drv && drv->shutdown)
454 drv->shutdown(pci_dev);
455 pci_msi_shutdown(pci_dev);
456 pci_msix_shutdown(pci_dev);
460 * If this is a kexec reboot, turn off Bus Master bit on the
461 * device to tell it to not continue to do DMA. Don't touch
462 * devices in D3cold or unknown states.
463 * If it is not a kexec reboot, firmware will hit the PCI
464 * devices with big hammer and stop their DMA any way.
466 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
467 pci_clear_master(pci_dev);
473 /* Auxiliary functions used for system resume and run-time resume. */
476 * pci_restore_standard_config - restore standard config registers of PCI device
477 * @pci_dev: PCI device to handle
479 static int pci_restore_standard_config(struct pci_dev *pci_dev)
481 pci_update_current_state(pci_dev, PCI_UNKNOWN);
483 if (pci_dev->current_state != PCI_D0) {
484 int error = pci_set_power_state(pci_dev, PCI_D0);
489 pci_restore_state(pci_dev);
495 #ifdef CONFIG_PM_SLEEP
497 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
499 pci_power_up(pci_dev);
500 pci_restore_state(pci_dev);
501 pci_fixup_device(pci_fixup_resume_early, pci_dev);
505 * Default "suspend" method for devices that have no driver provided suspend,
506 * or not even a driver at all (second part).
508 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
511 * mark its power state as "unknown", since we don't know if
512 * e.g. the BIOS will change its device state when we suspend.
514 if (pci_dev->current_state == PCI_D0)
515 pci_dev->current_state = PCI_UNKNOWN;
519 * Default "resume" method for devices that have no driver provided resume,
520 * or not even a driver at all (second part).
522 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
526 /* if the device was enabled before suspend, reenable */
527 retval = pci_reenable_device(pci_dev);
529 * if the device was busmaster before the suspend, make it busmaster
532 if (pci_dev->is_busmaster)
533 pci_set_master(pci_dev);
538 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
540 struct pci_dev * pci_dev = to_pci_dev(dev);
541 struct pci_driver * drv = pci_dev->driver;
543 if (drv && drv->suspend) {
544 pci_power_t prev = pci_dev->current_state;
547 error = drv->suspend(pci_dev, state);
548 suspend_report_result(drv->suspend, error);
552 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
553 && pci_dev->current_state != PCI_UNKNOWN) {
554 WARN_ONCE(pci_dev->current_state != prev,
555 "PCI PM: Device state not saved by %pF\n",
560 pci_fixup_device(pci_fixup_suspend, pci_dev);
565 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
567 struct pci_dev * pci_dev = to_pci_dev(dev);
568 struct pci_driver * drv = pci_dev->driver;
570 if (drv && drv->suspend_late) {
571 pci_power_t prev = pci_dev->current_state;
574 error = drv->suspend_late(pci_dev, state);
575 suspend_report_result(drv->suspend_late, error);
579 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
580 && pci_dev->current_state != PCI_UNKNOWN) {
581 WARN_ONCE(pci_dev->current_state != prev,
582 "PCI PM: Device state not saved by %pF\n",
588 if (!pci_dev->state_saved)
589 pci_save_state(pci_dev);
591 pci_pm_set_unknown_state(pci_dev);
596 static int pci_legacy_resume_early(struct device *dev)
598 struct pci_dev * pci_dev = to_pci_dev(dev);
599 struct pci_driver * drv = pci_dev->driver;
601 return drv && drv->resume_early ?
602 drv->resume_early(pci_dev) : 0;
605 static int pci_legacy_resume(struct device *dev)
607 struct pci_dev * pci_dev = to_pci_dev(dev);
608 struct pci_driver * drv = pci_dev->driver;
610 pci_fixup_device(pci_fixup_resume, pci_dev);
612 return drv && drv->resume ?
613 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
616 /* Auxiliary functions used by the new power management framework */
618 static void pci_pm_default_resume(struct pci_dev *pci_dev)
620 pci_fixup_device(pci_fixup_resume, pci_dev);
622 if (!pci_has_subordinate(pci_dev))
623 pci_enable_wake(pci_dev, PCI_D0, false);
626 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
628 /* Disable non-bridge devices without PM support */
629 if (!pci_has_subordinate(pci_dev))
630 pci_disable_enabled_device(pci_dev);
633 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
635 struct pci_driver *drv = pci_dev->driver;
636 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
637 || drv->resume_early);
640 * Legacy PM support is used by default, so warn if the new framework is
641 * supported as well. Drivers are supposed to support either the
642 * former, or the latter, but not both at the same time.
644 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
645 drv->name, pci_dev->vendor, pci_dev->device);
650 /* New power management framework */
652 static int pci_pm_prepare(struct device *dev)
654 struct device_driver *drv = dev->driver;
658 * Devices having power.ignore_children set may still be necessary for
659 * suspending their children in the next phase of device suspend.
661 if (dev->power.ignore_children)
662 pm_runtime_resume(dev);
664 if (drv && drv->pm && drv->pm->prepare)
665 error = drv->pm->prepare(dev);
671 #else /* !CONFIG_PM_SLEEP */
673 #define pci_pm_prepare NULL
675 #endif /* !CONFIG_PM_SLEEP */
677 #ifdef CONFIG_SUSPEND
679 static int pci_pm_suspend(struct device *dev)
681 struct pci_dev *pci_dev = to_pci_dev(dev);
682 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
684 if (pci_has_legacy_pm_support(pci_dev))
685 return pci_legacy_suspend(dev, PMSG_SUSPEND);
688 pci_pm_default_suspend(pci_dev);
693 * PCI devices suspended at run time need to be resumed at this point,
694 * because in general it is necessary to reconfigure them for system
695 * suspend. Namely, if the device is supposed to wake up the system
696 * from the sleep state, we may need to reconfigure it for this purpose.
697 * In turn, if the device is not supposed to wake up the system from the
698 * sleep state, we'll have to prevent it from signaling wake-up.
700 pm_runtime_resume(dev);
702 pci_dev->state_saved = false;
704 pci_power_t prev = pci_dev->current_state;
707 error = pm->suspend(dev);
708 suspend_report_result(pm->suspend, error);
712 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
713 && pci_dev->current_state != PCI_UNKNOWN) {
714 WARN_ONCE(pci_dev->current_state != prev,
715 "PCI PM: State of device not saved by %pF\n",
721 pci_fixup_device(pci_fixup_suspend, pci_dev);
726 static int pci_pm_suspend_noirq(struct device *dev)
728 struct pci_dev *pci_dev = to_pci_dev(dev);
729 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
731 if (pci_has_legacy_pm_support(pci_dev))
732 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
735 pci_save_state(pci_dev);
739 if (pm->suspend_noirq) {
740 pci_power_t prev = pci_dev->current_state;
743 error = pm->suspend_noirq(dev);
744 suspend_report_result(pm->suspend_noirq, error);
748 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
749 && pci_dev->current_state != PCI_UNKNOWN) {
750 WARN_ONCE(pci_dev->current_state != prev,
751 "PCI PM: State of device not saved by %pF\n",
757 if (!pci_dev->state_saved) {
758 pci_save_state(pci_dev);
759 if (!pci_has_subordinate(pci_dev))
760 pci_prepare_to_sleep(pci_dev);
763 pci_pm_set_unknown_state(pci_dev);
766 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
767 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
768 * hasn't been quiesced and tries to turn it off. If the controller
769 * is already in D3, this can hang or cause memory corruption.
771 * Since the value of the COMMAND register doesn't matter once the
772 * device has been suspended, we can safely set it to 0 here.
774 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
775 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
780 static int pci_pm_resume_noirq(struct device *dev)
782 struct pci_dev *pci_dev = to_pci_dev(dev);
783 struct device_driver *drv = dev->driver;
786 pci_pm_default_resume_early(pci_dev);
788 if (pci_has_legacy_pm_support(pci_dev))
789 return pci_legacy_resume_early(dev);
791 if (drv && drv->pm && drv->pm->resume_noirq)
792 error = drv->pm->resume_noirq(dev);
797 static int pci_pm_resume(struct device *dev)
799 struct pci_dev *pci_dev = to_pci_dev(dev);
800 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
804 * This is necessary for the suspend error path in which resume is
805 * called without restoring the standard config registers of the device.
807 if (pci_dev->state_saved)
808 pci_restore_standard_config(pci_dev);
810 if (pci_has_legacy_pm_support(pci_dev))
811 return pci_legacy_resume(dev);
813 pci_pm_default_resume(pci_dev);
817 error = pm->resume(dev);
819 pci_pm_reenable_device(pci_dev);
825 #else /* !CONFIG_SUSPEND */
827 #define pci_pm_suspend NULL
828 #define pci_pm_suspend_noirq NULL
829 #define pci_pm_resume NULL
830 #define pci_pm_resume_noirq NULL
832 #endif /* !CONFIG_SUSPEND */
834 #ifdef CONFIG_HIBERNATE_CALLBACKS
838 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
839 * a hibernate transition
841 struct dev_pm_ops __weak pcibios_pm_ops;
843 static int pci_pm_freeze(struct device *dev)
845 struct pci_dev *pci_dev = to_pci_dev(dev);
846 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
848 if (pci_has_legacy_pm_support(pci_dev))
849 return pci_legacy_suspend(dev, PMSG_FREEZE);
852 pci_pm_default_suspend(pci_dev);
857 * This used to be done in pci_pm_prepare() for all devices and some
858 * drivers may depend on it, so do it here. Ideally, runtime-suspended
859 * devices should not be touched during freeze/thaw transitions,
862 pm_runtime_resume(dev);
864 pci_dev->state_saved = false;
868 error = pm->freeze(dev);
869 suspend_report_result(pm->freeze, error);
874 if (pcibios_pm_ops.freeze)
875 return pcibios_pm_ops.freeze(dev);
880 static int pci_pm_freeze_noirq(struct device *dev)
882 struct pci_dev *pci_dev = to_pci_dev(dev);
883 struct device_driver *drv = dev->driver;
885 if (pci_has_legacy_pm_support(pci_dev))
886 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
888 if (drv && drv->pm && drv->pm->freeze_noirq) {
891 error = drv->pm->freeze_noirq(dev);
892 suspend_report_result(drv->pm->freeze_noirq, error);
897 if (!pci_dev->state_saved)
898 pci_save_state(pci_dev);
900 pci_pm_set_unknown_state(pci_dev);
902 if (pcibios_pm_ops.freeze_noirq)
903 return pcibios_pm_ops.freeze_noirq(dev);
908 static int pci_pm_thaw_noirq(struct device *dev)
910 struct pci_dev *pci_dev = to_pci_dev(dev);
911 struct device_driver *drv = dev->driver;
914 if (pcibios_pm_ops.thaw_noirq) {
915 error = pcibios_pm_ops.thaw_noirq(dev);
920 if (pci_has_legacy_pm_support(pci_dev))
921 return pci_legacy_resume_early(dev);
923 pci_update_current_state(pci_dev, PCI_D0);
925 if (drv && drv->pm && drv->pm->thaw_noirq)
926 error = drv->pm->thaw_noirq(dev);
931 static int pci_pm_thaw(struct device *dev)
933 struct pci_dev *pci_dev = to_pci_dev(dev);
934 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
937 if (pcibios_pm_ops.thaw) {
938 error = pcibios_pm_ops.thaw(dev);
943 if (pci_has_legacy_pm_support(pci_dev))
944 return pci_legacy_resume(dev);
948 error = pm->thaw(dev);
950 pci_pm_reenable_device(pci_dev);
953 pci_dev->state_saved = false;
958 static int pci_pm_poweroff(struct device *dev)
960 struct pci_dev *pci_dev = to_pci_dev(dev);
961 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
963 if (pci_has_legacy_pm_support(pci_dev))
964 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
967 pci_pm_default_suspend(pci_dev);
971 /* The reason to do that is the same as in pci_pm_suspend(). */
972 pm_runtime_resume(dev);
974 pci_dev->state_saved = false;
978 error = pm->poweroff(dev);
979 suspend_report_result(pm->poweroff, error);
985 pci_fixup_device(pci_fixup_suspend, pci_dev);
987 if (pcibios_pm_ops.poweroff)
988 return pcibios_pm_ops.poweroff(dev);
993 static int pci_pm_poweroff_noirq(struct device *dev)
995 struct pci_dev *pci_dev = to_pci_dev(dev);
996 struct device_driver *drv = dev->driver;
998 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
999 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1001 if (!drv || !drv->pm)
1004 if (drv->pm->poweroff_noirq) {
1007 error = drv->pm->poweroff_noirq(dev);
1008 suspend_report_result(drv->pm->poweroff_noirq, error);
1013 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1014 pci_prepare_to_sleep(pci_dev);
1017 * The reason for doing this here is the same as for the analogous code
1018 * in pci_pm_suspend_noirq().
1020 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1021 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1023 if (pcibios_pm_ops.poweroff_noirq)
1024 return pcibios_pm_ops.poweroff_noirq(dev);
1029 static int pci_pm_restore_noirq(struct device *dev)
1031 struct pci_dev *pci_dev = to_pci_dev(dev);
1032 struct device_driver *drv = dev->driver;
1035 if (pcibios_pm_ops.restore_noirq) {
1036 error = pcibios_pm_ops.restore_noirq(dev);
1041 pci_pm_default_resume_early(pci_dev);
1043 if (pci_has_legacy_pm_support(pci_dev))
1044 return pci_legacy_resume_early(dev);
1046 if (drv && drv->pm && drv->pm->restore_noirq)
1047 error = drv->pm->restore_noirq(dev);
1052 static int pci_pm_restore(struct device *dev)
1054 struct pci_dev *pci_dev = to_pci_dev(dev);
1055 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1058 if (pcibios_pm_ops.restore) {
1059 error = pcibios_pm_ops.restore(dev);
1065 * This is necessary for the hibernation error path in which restore is
1066 * called without restoring the standard config registers of the device.
1068 if (pci_dev->state_saved)
1069 pci_restore_standard_config(pci_dev);
1071 if (pci_has_legacy_pm_support(pci_dev))
1072 return pci_legacy_resume(dev);
1074 pci_pm_default_resume(pci_dev);
1078 error = pm->restore(dev);
1080 pci_pm_reenable_device(pci_dev);
1086 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1088 #define pci_pm_freeze NULL
1089 #define pci_pm_freeze_noirq NULL
1090 #define pci_pm_thaw NULL
1091 #define pci_pm_thaw_noirq NULL
1092 #define pci_pm_poweroff NULL
1093 #define pci_pm_poweroff_noirq NULL
1094 #define pci_pm_restore NULL
1095 #define pci_pm_restore_noirq NULL
1097 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1099 #ifdef CONFIG_PM_RUNTIME
1101 static int pci_pm_runtime_suspend(struct device *dev)
1103 struct pci_dev *pci_dev = to_pci_dev(dev);
1104 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1105 pci_power_t prev = pci_dev->current_state;
1109 * If pci_dev->driver is not set (unbound), the device should
1110 * always remain in D0 regardless of the runtime PM status
1112 if (!pci_dev->driver)
1115 if (!pm || !pm->runtime_suspend)
1118 pci_dev->state_saved = false;
1119 pci_dev->no_d3cold = false;
1120 error = pm->runtime_suspend(dev);
1121 suspend_report_result(pm->runtime_suspend, error);
1124 if (!pci_dev->d3cold_allowed)
1125 pci_dev->no_d3cold = true;
1127 pci_fixup_device(pci_fixup_suspend, pci_dev);
1129 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1130 && pci_dev->current_state != PCI_UNKNOWN) {
1131 WARN_ONCE(pci_dev->current_state != prev,
1132 "PCI PM: State of device not saved by %pF\n",
1133 pm->runtime_suspend);
1137 if (!pci_dev->state_saved) {
1138 pci_save_state(pci_dev);
1139 pci_finish_runtime_suspend(pci_dev);
1145 static int pci_pm_runtime_resume(struct device *dev)
1148 struct pci_dev *pci_dev = to_pci_dev(dev);
1149 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1152 * If pci_dev->driver is not set (unbound), the device should
1153 * always remain in D0 regardless of the runtime PM status
1155 if (!pci_dev->driver)
1158 if (!pm || !pm->runtime_resume)
1161 pci_restore_standard_config(pci_dev);
1162 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1163 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1164 pci_fixup_device(pci_fixup_resume, pci_dev);
1166 rc = pm->runtime_resume(dev);
1168 pci_dev->runtime_d3cold = false;
1173 static int pci_pm_runtime_idle(struct device *dev)
1175 struct pci_dev *pci_dev = to_pci_dev(dev);
1176 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1180 * If pci_dev->driver is not set (unbound), the device should
1181 * always remain in D0 regardless of the runtime PM status
1183 if (!pci_dev->driver)
1189 if (pm->runtime_idle)
1190 ret = pm->runtime_idle(dev);
1195 #else /* !CONFIG_PM_RUNTIME */
1197 #define pci_pm_runtime_suspend NULL
1198 #define pci_pm_runtime_resume NULL
1199 #define pci_pm_runtime_idle NULL
1201 #endif /* !CONFIG_PM_RUNTIME */
1205 static const struct dev_pm_ops pci_dev_pm_ops = {
1206 .prepare = pci_pm_prepare,
1207 .suspend = pci_pm_suspend,
1208 .resume = pci_pm_resume,
1209 .freeze = pci_pm_freeze,
1210 .thaw = pci_pm_thaw,
1211 .poweroff = pci_pm_poweroff,
1212 .restore = pci_pm_restore,
1213 .suspend_noirq = pci_pm_suspend_noirq,
1214 .resume_noirq = pci_pm_resume_noirq,
1215 .freeze_noirq = pci_pm_freeze_noirq,
1216 .thaw_noirq = pci_pm_thaw_noirq,
1217 .poweroff_noirq = pci_pm_poweroff_noirq,
1218 .restore_noirq = pci_pm_restore_noirq,
1219 .runtime_suspend = pci_pm_runtime_suspend,
1220 .runtime_resume = pci_pm_runtime_resume,
1221 .runtime_idle = pci_pm_runtime_idle,
1224 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1226 #else /* !COMFIG_PM_OPS */
1228 #define PCI_PM_OPS_PTR NULL
1230 #endif /* !COMFIG_PM_OPS */
1233 * __pci_register_driver - register a new pci driver
1234 * @drv: the driver structure to register
1235 * @owner: owner module of drv
1236 * @mod_name: module name string
1238 * Adds the driver structure to the list of registered drivers.
1239 * Returns a negative value on error, otherwise 0.
1240 * If no error occurred, the driver remains registered even if
1241 * no device was claimed during registration.
1243 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1244 const char *mod_name)
1246 /* initialize common driver fields */
1247 drv->driver.name = drv->name;
1248 drv->driver.bus = &pci_bus_type;
1249 drv->driver.owner = owner;
1250 drv->driver.mod_name = mod_name;
1252 spin_lock_init(&drv->dynids.lock);
1253 INIT_LIST_HEAD(&drv->dynids.list);
1255 /* register with core */
1256 return driver_register(&drv->driver);
1260 * pci_unregister_driver - unregister a pci driver
1261 * @drv: the driver structure to unregister
1263 * Deletes the driver structure from the list of registered PCI drivers,
1264 * gives it a chance to clean up by calling its remove() function for
1265 * each device it was responsible for, and marks those devices as
1270 pci_unregister_driver(struct pci_driver *drv)
1272 driver_unregister(&drv->driver);
1273 pci_free_dynids(drv);
1276 static struct pci_driver pci_compat_driver = {
1281 * pci_dev_driver - get the pci_driver of a device
1282 * @dev: the device to query
1284 * Returns the appropriate pci_driver structure or %NULL if there is no
1285 * registered driver for the device.
1288 pci_dev_driver(const struct pci_dev *dev)
1294 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1295 if (dev->resource[i].flags & IORESOURCE_BUSY)
1296 return &pci_compat_driver;
1302 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1303 * @dev: the PCI device structure to match against
1304 * @drv: the device driver to search for matching PCI device id structures
1306 * Used by a driver to check whether a PCI device present in the
1307 * system is in its list of supported devices. Returns the matching
1308 * pci_device_id structure or %NULL if there is no match.
1310 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1312 struct pci_dev *pci_dev = to_pci_dev(dev);
1313 struct pci_driver *pci_drv;
1314 const struct pci_device_id *found_id;
1316 if (!pci_dev->match_driver)
1319 pci_drv = to_pci_driver(drv);
1320 found_id = pci_match_device(pci_drv, pci_dev);
1328 * pci_dev_get - increments the reference count of the pci device structure
1329 * @dev: the device being referenced
1331 * Each live reference to a device should be refcounted.
1333 * Drivers for PCI devices should normally record such references in
1334 * their probe() methods, when they bind to a device, and release
1335 * them by calling pci_dev_put(), in their disconnect() methods.
1337 * A pointer to the device with the incremented reference counter is returned.
1339 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1342 get_device(&dev->dev);
1347 * pci_dev_put - release a use of the pci device structure
1348 * @dev: device that's been disconnected
1350 * Must be called when a user of a device is finished with it. When the last
1351 * user of the device calls this function, the memory of the device is freed.
1353 void pci_dev_put(struct pci_dev *dev)
1356 put_device(&dev->dev);
1359 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1361 struct pci_dev *pdev;
1366 pdev = to_pci_dev(dev);
1368 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1371 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1374 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1375 pdev->subsystem_device))
1378 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1381 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1382 pdev->vendor, pdev->device,
1383 pdev->subsystem_vendor, pdev->subsystem_device,
1384 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1391 struct bus_type pci_bus_type = {
1393 .match = pci_bus_match,
1394 .uevent = pci_uevent,
1395 .probe = pci_device_probe,
1396 .remove = pci_device_remove,
1397 .shutdown = pci_device_shutdown,
1398 .dev_groups = pci_dev_groups,
1399 .bus_groups = pci_bus_groups,
1400 .drv_groups = pci_drv_groups,
1401 .pm = PCI_PM_OPS_PTR,
1404 static int __init pci_driver_init(void)
1406 return bus_register(&pci_bus_type);
1409 postcore_initcall(pci_driver_init);
1411 EXPORT_SYMBOL_GPL(pci_add_dynid);
1412 EXPORT_SYMBOL(pci_match_id);
1413 EXPORT_SYMBOL(__pci_register_driver);
1414 EXPORT_SYMBOL(pci_unregister_driver);
1415 EXPORT_SYMBOL(pci_dev_driver);
1416 EXPORT_SYMBOL(pci_bus_type);
1417 EXPORT_SYMBOL(pci_dev_get);
1418 EXPORT_SYMBOL(pci_dev_put);