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);
118 /* Only accept driver_data values that match an existing id_table
122 while (ids->vendor || ids->subvendor || ids->class_mask) {
123 if (driver_data == ids->driver_data) {
129 if (retval) /* No match */
133 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
134 class, class_mask, driver_data);
139 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
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
147 * Removes a dynamic pci device ID to this driver.
150 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
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;
157 int retval = -ENODEV;
159 fields = sscanf(buf, "%x %x %x %x %x %x",
160 &vendor, &device, &subvendor, &subdevice,
161 &class, &class_mask);
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);
179 spin_unlock(&pdrv->dynids.lock);
185 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
187 static struct attribute *pci_drv_attrs[] = {
188 &driver_attr_new_id.attr,
189 &driver_attr_remove_id.attr,
192 ATTRIBUTE_GROUPS(pci_drv);
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.
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.
203 * Deprecated, don't use this as it will not catch any dynamic ids
204 * that a driver might want to check for.
206 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
210 while (ids->vendor || ids->subvendor || ids->class_mask) {
211 if (pci_match_one_device(ids, dev))
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
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.
228 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
231 struct pci_dynid *dynid;
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);
241 spin_unlock(&drv->dynids.lock);
243 return pci_match_id(drv->id_table, dev);
246 struct drv_dev_and_id {
247 struct pci_driver *drv;
249 const struct pci_device_id *id;
252 static long local_pci_probe(void *_ddi)
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;
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
268 pm_runtime_get_sync(dev);
269 pci_dev->driver = pci_drv;
270 rc = pci_drv->probe(pci_dev, ddi->id);
274 pci_dev->driver = NULL;
275 pm_runtime_put_sync(dev);
279 * Probe function should return < 0 for failure, 0 for success
280 * Treat values > 0 as success, but warn.
282 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
286 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
287 const struct pci_device_id *id)
290 struct drv_dev_and_id ddi = { drv, dev, id };
293 * Execute driver initialization on node where the device is
294 * attached. This way the driver likely allocates its local memory
297 node = dev_to_node(&dev->dev);
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.
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.
312 if (node >= 0 && node != numa_node_id()) {
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);
320 error = local_pci_probe(&ddi);
323 error = local_pci_probe(&ddi);
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
333 * returns 0 on success, else error.
334 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
337 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
339 const struct pci_device_id *id;
342 if (!pci_dev->driver && drv->probe) {
345 id = pci_match_device(drv, pci_dev);
347 error = pci_call_probe(drv, pci_dev, id);
354 static int pci_device_probe(struct device * dev)
357 struct pci_driver *drv;
358 struct pci_dev *pci_dev;
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);
365 pci_dev_put(pci_dev);
370 static int pci_device_remove(struct device * dev)
372 struct pci_dev * pci_dev = to_pci_dev(dev);
373 struct pci_driver * drv = pci_dev->driver;
377 pm_runtime_get_sync(dev);
378 drv->remove(pci_dev);
379 pm_runtime_put_noidle(dev);
381 pci_dev->driver = NULL;
384 /* Undo the runtime PM settings in local_pci_probe() */
385 pm_runtime_put_sync(dev);
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.
391 if (pci_dev->current_state == PCI_D0)
392 pci_dev->current_state = PCI_UNKNOWN;
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...
403 pci_dev_put(pci_dev);
407 static void pci_device_shutdown(struct device *dev)
409 struct pci_dev *pci_dev = to_pci_dev(dev);
410 struct pci_driver *drv = pci_dev->driver;
412 pm_runtime_resume(dev);
414 if (drv && drv->shutdown)
415 drv->shutdown(pci_dev);
416 pci_msi_shutdown(pci_dev);
417 pci_msix_shutdown(pci_dev);
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.
427 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
428 pci_clear_master(pci_dev);
434 /* Auxiliary functions used for system resume and run-time resume. */
437 * pci_restore_standard_config - restore standard config registers of PCI device
438 * @pci_dev: PCI device to handle
440 static int pci_restore_standard_config(struct pci_dev *pci_dev)
442 pci_update_current_state(pci_dev, PCI_UNKNOWN);
444 if (pci_dev->current_state != PCI_D0) {
445 int error = pci_set_power_state(pci_dev, PCI_D0);
450 pci_restore_state(pci_dev);
456 #ifdef CONFIG_PM_SLEEP
458 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
460 pci_power_up(pci_dev);
461 pci_restore_state(pci_dev);
462 pci_fixup_device(pci_fixup_resume_early, pci_dev);
466 * Default "suspend" method for devices that have no driver provided suspend,
467 * or not even a driver at all (second part).
469 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
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.
475 if (pci_dev->current_state == PCI_D0)
476 pci_dev->current_state = PCI_UNKNOWN;
480 * Default "resume" method for devices that have no driver provided resume,
481 * or not even a driver at all (second part).
483 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
487 /* if the device was enabled before suspend, reenable */
488 retval = pci_reenable_device(pci_dev);
490 * if the device was busmaster before the suspend, make it busmaster
493 if (pci_dev->is_busmaster)
494 pci_set_master(pci_dev);
499 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
501 struct pci_dev * pci_dev = to_pci_dev(dev);
502 struct pci_driver * drv = pci_dev->driver;
504 if (drv && drv->suspend) {
505 pci_power_t prev = pci_dev->current_state;
508 error = drv->suspend(pci_dev, state);
509 suspend_report_result(drv->suspend, error);
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",
521 pci_fixup_device(pci_fixup_suspend, pci_dev);
526 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
528 struct pci_dev * pci_dev = to_pci_dev(dev);
529 struct pci_driver * drv = pci_dev->driver;
531 if (drv && drv->suspend_late) {
532 pci_power_t prev = pci_dev->current_state;
535 error = drv->suspend_late(pci_dev, state);
536 suspend_report_result(drv->suspend_late, error);
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",
549 if (!pci_dev->state_saved)
550 pci_save_state(pci_dev);
552 pci_pm_set_unknown_state(pci_dev);
557 static int pci_legacy_resume_early(struct device *dev)
559 struct pci_dev * pci_dev = to_pci_dev(dev);
560 struct pci_driver * drv = pci_dev->driver;
562 return drv && drv->resume_early ?
563 drv->resume_early(pci_dev) : 0;
566 static int pci_legacy_resume(struct device *dev)
568 struct pci_dev * pci_dev = to_pci_dev(dev);
569 struct pci_driver * drv = pci_dev->driver;
571 pci_fixup_device(pci_fixup_resume, pci_dev);
573 return drv && drv->resume ?
574 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
577 /* Auxiliary functions used by the new power management framework */
579 static void pci_pm_default_resume(struct pci_dev *pci_dev)
581 pci_fixup_device(pci_fixup_resume, pci_dev);
583 if (!pci_is_bridge(pci_dev))
584 pci_enable_wake(pci_dev, PCI_D0, false);
587 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
589 /* Disable non-bridge devices without PM support */
590 if (!pci_is_bridge(pci_dev))
591 pci_disable_enabled_device(pci_dev);
594 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
596 struct pci_driver *drv = pci_dev->driver;
597 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
598 || drv->resume_early);
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.
605 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
606 drv->name, pci_dev->vendor, pci_dev->device);
611 /* New power management framework */
613 static int pci_pm_prepare(struct device *dev)
615 struct device_driver *drv = dev->driver;
619 * PCI devices suspended at run time need to be resumed at this
620 * point, because in general it is necessary to reconfigure them for
621 * system suspend. Namely, if the device is supposed to wake up the
622 * system from the sleep state, we may need to reconfigure it for this
623 * purpose. In turn, if the device is not supposed to wake up the
624 * system from the sleep state, we'll have to prevent it from signaling
627 pm_runtime_resume(dev);
629 if (drv && drv->pm && drv->pm->prepare)
630 error = drv->pm->prepare(dev);
636 #else /* !CONFIG_PM_SLEEP */
638 #define pci_pm_prepare NULL
640 #endif /* !CONFIG_PM_SLEEP */
642 #ifdef CONFIG_SUSPEND
644 static int pci_pm_suspend(struct device *dev)
646 struct pci_dev *pci_dev = to_pci_dev(dev);
647 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
649 if (pci_has_legacy_pm_support(pci_dev))
650 return pci_legacy_suspend(dev, PMSG_SUSPEND);
653 pci_pm_default_suspend(pci_dev);
657 pci_dev->state_saved = false;
659 pci_power_t prev = pci_dev->current_state;
662 error = pm->suspend(dev);
663 suspend_report_result(pm->suspend, error);
667 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
668 && pci_dev->current_state != PCI_UNKNOWN) {
669 WARN_ONCE(pci_dev->current_state != prev,
670 "PCI PM: State of device not saved by %pF\n",
676 pci_fixup_device(pci_fixup_suspend, pci_dev);
681 static int pci_pm_suspend_noirq(struct device *dev)
683 struct pci_dev *pci_dev = to_pci_dev(dev);
684 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
686 if (pci_has_legacy_pm_support(pci_dev))
687 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
690 pci_save_state(pci_dev);
694 if (pm->suspend_noirq) {
695 pci_power_t prev = pci_dev->current_state;
698 error = pm->suspend_noirq(dev);
699 suspend_report_result(pm->suspend_noirq, error);
703 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
704 && pci_dev->current_state != PCI_UNKNOWN) {
705 WARN_ONCE(pci_dev->current_state != prev,
706 "PCI PM: State of device not saved by %pF\n",
712 if (!pci_dev->state_saved) {
713 pci_save_state(pci_dev);
714 if (!pci_is_bridge(pci_dev))
715 pci_prepare_to_sleep(pci_dev);
718 pci_pm_set_unknown_state(pci_dev);
721 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
722 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
723 * hasn't been quiesced and tries to turn it off. If the controller
724 * is already in D3, this can hang or cause memory corruption.
726 * Since the value of the COMMAND register doesn't matter once the
727 * device has been suspended, we can safely set it to 0 here.
729 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
730 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
735 static int pci_pm_resume_noirq(struct device *dev)
737 struct pci_dev *pci_dev = to_pci_dev(dev);
738 struct device_driver *drv = dev->driver;
741 pci_pm_default_resume_early(pci_dev);
743 if (pci_has_legacy_pm_support(pci_dev))
744 return pci_legacy_resume_early(dev);
746 if (drv && drv->pm && drv->pm->resume_noirq)
747 error = drv->pm->resume_noirq(dev);
752 static int pci_pm_resume(struct device *dev)
754 struct pci_dev *pci_dev = to_pci_dev(dev);
755 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
759 * This is necessary for the suspend error path in which resume is
760 * called without restoring the standard config registers of the device.
762 if (pci_dev->state_saved)
763 pci_restore_standard_config(pci_dev);
765 if (pci_has_legacy_pm_support(pci_dev))
766 return pci_legacy_resume(dev);
768 pci_pm_default_resume(pci_dev);
772 error = pm->resume(dev);
774 pci_pm_reenable_device(pci_dev);
780 #else /* !CONFIG_SUSPEND */
782 #define pci_pm_suspend NULL
783 #define pci_pm_suspend_noirq NULL
784 #define pci_pm_resume NULL
785 #define pci_pm_resume_noirq NULL
787 #endif /* !CONFIG_SUSPEND */
789 #ifdef CONFIG_HIBERNATE_CALLBACKS
793 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
794 * a hibernate transition
796 struct dev_pm_ops __weak pcibios_pm_ops;
798 static int pci_pm_freeze(struct device *dev)
800 struct pci_dev *pci_dev = to_pci_dev(dev);
801 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
803 if (pci_has_legacy_pm_support(pci_dev))
804 return pci_legacy_suspend(dev, PMSG_FREEZE);
807 pci_pm_default_suspend(pci_dev);
811 pci_dev->state_saved = false;
815 error = pm->freeze(dev);
816 suspend_report_result(pm->freeze, error);
821 if (pcibios_pm_ops.freeze)
822 return pcibios_pm_ops.freeze(dev);
827 static int pci_pm_freeze_noirq(struct device *dev)
829 struct pci_dev *pci_dev = to_pci_dev(dev);
830 struct device_driver *drv = dev->driver;
832 if (pci_has_legacy_pm_support(pci_dev))
833 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
835 if (drv && drv->pm && drv->pm->freeze_noirq) {
838 error = drv->pm->freeze_noirq(dev);
839 suspend_report_result(drv->pm->freeze_noirq, error);
844 if (!pci_dev->state_saved)
845 pci_save_state(pci_dev);
847 pci_pm_set_unknown_state(pci_dev);
849 if (pcibios_pm_ops.freeze_noirq)
850 return pcibios_pm_ops.freeze_noirq(dev);
855 static int pci_pm_thaw_noirq(struct device *dev)
857 struct pci_dev *pci_dev = to_pci_dev(dev);
858 struct device_driver *drv = dev->driver;
861 if (pcibios_pm_ops.thaw_noirq) {
862 error = pcibios_pm_ops.thaw_noirq(dev);
867 if (pci_has_legacy_pm_support(pci_dev))
868 return pci_legacy_resume_early(dev);
870 pci_update_current_state(pci_dev, PCI_D0);
872 if (drv && drv->pm && drv->pm->thaw_noirq)
873 error = drv->pm->thaw_noirq(dev);
878 static int pci_pm_thaw(struct device *dev)
880 struct pci_dev *pci_dev = to_pci_dev(dev);
881 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
884 if (pcibios_pm_ops.thaw) {
885 error = pcibios_pm_ops.thaw(dev);
890 if (pci_has_legacy_pm_support(pci_dev))
891 return pci_legacy_resume(dev);
895 error = pm->thaw(dev);
897 pci_pm_reenable_device(pci_dev);
900 pci_dev->state_saved = false;
905 static int pci_pm_poweroff(struct device *dev)
907 struct pci_dev *pci_dev = to_pci_dev(dev);
908 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
910 if (pci_has_legacy_pm_support(pci_dev))
911 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
914 pci_pm_default_suspend(pci_dev);
918 pci_dev->state_saved = false;
922 error = pm->poweroff(dev);
923 suspend_report_result(pm->poweroff, error);
929 pci_fixup_device(pci_fixup_suspend, pci_dev);
931 if (pcibios_pm_ops.poweroff)
932 return pcibios_pm_ops.poweroff(dev);
937 static int pci_pm_poweroff_noirq(struct device *dev)
939 struct pci_dev *pci_dev = to_pci_dev(dev);
940 struct device_driver *drv = dev->driver;
942 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
943 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
945 if (!drv || !drv->pm)
948 if (drv->pm->poweroff_noirq) {
951 error = drv->pm->poweroff_noirq(dev);
952 suspend_report_result(drv->pm->poweroff_noirq, error);
957 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
958 pci_prepare_to_sleep(pci_dev);
961 * The reason for doing this here is the same as for the analogous code
962 * in pci_pm_suspend_noirq().
964 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
965 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
967 if (pcibios_pm_ops.poweroff_noirq)
968 return pcibios_pm_ops.poweroff_noirq(dev);
973 static int pci_pm_restore_noirq(struct device *dev)
975 struct pci_dev *pci_dev = to_pci_dev(dev);
976 struct device_driver *drv = dev->driver;
979 if (pcibios_pm_ops.restore_noirq) {
980 error = pcibios_pm_ops.restore_noirq(dev);
985 pci_pm_default_resume_early(pci_dev);
987 if (pci_has_legacy_pm_support(pci_dev))
988 return pci_legacy_resume_early(dev);
990 if (drv && drv->pm && drv->pm->restore_noirq)
991 error = drv->pm->restore_noirq(dev);
996 static int pci_pm_restore(struct device *dev)
998 struct pci_dev *pci_dev = to_pci_dev(dev);
999 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1002 if (pcibios_pm_ops.restore) {
1003 error = pcibios_pm_ops.restore(dev);
1009 * This is necessary for the hibernation error path in which restore is
1010 * called without restoring the standard config registers of the device.
1012 if (pci_dev->state_saved)
1013 pci_restore_standard_config(pci_dev);
1015 if (pci_has_legacy_pm_support(pci_dev))
1016 return pci_legacy_resume(dev);
1018 pci_pm_default_resume(pci_dev);
1022 error = pm->restore(dev);
1024 pci_pm_reenable_device(pci_dev);
1030 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1032 #define pci_pm_freeze NULL
1033 #define pci_pm_freeze_noirq NULL
1034 #define pci_pm_thaw NULL
1035 #define pci_pm_thaw_noirq NULL
1036 #define pci_pm_poweroff NULL
1037 #define pci_pm_poweroff_noirq NULL
1038 #define pci_pm_restore NULL
1039 #define pci_pm_restore_noirq NULL
1041 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1043 #ifdef CONFIG_PM_RUNTIME
1045 static int pci_pm_runtime_suspend(struct device *dev)
1047 struct pci_dev *pci_dev = to_pci_dev(dev);
1048 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1049 pci_power_t prev = pci_dev->current_state;
1053 * If pci_dev->driver is not set (unbound), the device should
1054 * always remain in D0 regardless of the runtime PM status
1056 if (!pci_dev->driver)
1059 if (!pm || !pm->runtime_suspend)
1062 pci_dev->state_saved = false;
1063 pci_dev->no_d3cold = false;
1064 error = pm->runtime_suspend(dev);
1065 suspend_report_result(pm->runtime_suspend, error);
1068 if (!pci_dev->d3cold_allowed)
1069 pci_dev->no_d3cold = true;
1071 pci_fixup_device(pci_fixup_suspend, pci_dev);
1073 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1074 && pci_dev->current_state != PCI_UNKNOWN) {
1075 WARN_ONCE(pci_dev->current_state != prev,
1076 "PCI PM: State of device not saved by %pF\n",
1077 pm->runtime_suspend);
1081 if (!pci_dev->state_saved) {
1082 pci_save_state(pci_dev);
1083 pci_finish_runtime_suspend(pci_dev);
1089 static int pci_pm_runtime_resume(struct device *dev)
1092 struct pci_dev *pci_dev = to_pci_dev(dev);
1093 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1096 * If pci_dev->driver is not set (unbound), the device should
1097 * always remain in D0 regardless of the runtime PM status
1099 if (!pci_dev->driver)
1102 if (!pm || !pm->runtime_resume)
1105 pci_restore_standard_config(pci_dev);
1106 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1107 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1108 pci_fixup_device(pci_fixup_resume, pci_dev);
1110 rc = pm->runtime_resume(dev);
1112 pci_dev->runtime_d3cold = false;
1117 static int pci_pm_runtime_idle(struct device *dev)
1119 struct pci_dev *pci_dev = to_pci_dev(dev);
1120 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1124 * If pci_dev->driver is not set (unbound), the device should
1125 * always remain in D0 regardless of the runtime PM status
1127 if (!pci_dev->driver)
1133 if (pm->runtime_idle)
1134 ret = pm->runtime_idle(dev);
1139 #else /* !CONFIG_PM_RUNTIME */
1141 #define pci_pm_runtime_suspend NULL
1142 #define pci_pm_runtime_resume NULL
1143 #define pci_pm_runtime_idle NULL
1145 #endif /* !CONFIG_PM_RUNTIME */
1149 static const struct dev_pm_ops pci_dev_pm_ops = {
1150 .prepare = pci_pm_prepare,
1151 .suspend = pci_pm_suspend,
1152 .resume = pci_pm_resume,
1153 .freeze = pci_pm_freeze,
1154 .thaw = pci_pm_thaw,
1155 .poweroff = pci_pm_poweroff,
1156 .restore = pci_pm_restore,
1157 .suspend_noirq = pci_pm_suspend_noirq,
1158 .resume_noirq = pci_pm_resume_noirq,
1159 .freeze_noirq = pci_pm_freeze_noirq,
1160 .thaw_noirq = pci_pm_thaw_noirq,
1161 .poweroff_noirq = pci_pm_poweroff_noirq,
1162 .restore_noirq = pci_pm_restore_noirq,
1163 .runtime_suspend = pci_pm_runtime_suspend,
1164 .runtime_resume = pci_pm_runtime_resume,
1165 .runtime_idle = pci_pm_runtime_idle,
1168 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1170 #else /* !COMFIG_PM_OPS */
1172 #define PCI_PM_OPS_PTR NULL
1174 #endif /* !COMFIG_PM_OPS */
1177 * __pci_register_driver - register a new pci driver
1178 * @drv: the driver structure to register
1179 * @owner: owner module of drv
1180 * @mod_name: module name string
1182 * Adds the driver structure to the list of registered drivers.
1183 * Returns a negative value on error, otherwise 0.
1184 * If no error occurred, the driver remains registered even if
1185 * no device was claimed during registration.
1187 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1188 const char *mod_name)
1190 /* initialize common driver fields */
1191 drv->driver.name = drv->name;
1192 drv->driver.bus = &pci_bus_type;
1193 drv->driver.owner = owner;
1194 drv->driver.mod_name = mod_name;
1196 spin_lock_init(&drv->dynids.lock);
1197 INIT_LIST_HEAD(&drv->dynids.list);
1199 /* register with core */
1200 return driver_register(&drv->driver);
1204 * pci_unregister_driver - unregister a pci driver
1205 * @drv: the driver structure to unregister
1207 * Deletes the driver structure from the list of registered PCI drivers,
1208 * gives it a chance to clean up by calling its remove() function for
1209 * each device it was responsible for, and marks those devices as
1214 pci_unregister_driver(struct pci_driver *drv)
1216 driver_unregister(&drv->driver);
1217 pci_free_dynids(drv);
1220 static struct pci_driver pci_compat_driver = {
1225 * pci_dev_driver - get the pci_driver of a device
1226 * @dev: the device to query
1228 * Returns the appropriate pci_driver structure or %NULL if there is no
1229 * registered driver for the device.
1232 pci_dev_driver(const struct pci_dev *dev)
1238 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1239 if (dev->resource[i].flags & IORESOURCE_BUSY)
1240 return &pci_compat_driver;
1246 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1247 * @dev: the PCI device structure to match against
1248 * @drv: the device driver to search for matching PCI device id structures
1250 * Used by a driver to check whether a PCI device present in the
1251 * system is in its list of supported devices. Returns the matching
1252 * pci_device_id structure or %NULL if there is no match.
1254 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1256 struct pci_dev *pci_dev = to_pci_dev(dev);
1257 struct pci_driver *pci_drv;
1258 const struct pci_device_id *found_id;
1260 if (!pci_dev->match_driver)
1263 pci_drv = to_pci_driver(drv);
1264 found_id = pci_match_device(pci_drv, pci_dev);
1272 * pci_dev_get - increments the reference count of the pci device structure
1273 * @dev: the device being referenced
1275 * Each live reference to a device should be refcounted.
1277 * Drivers for PCI devices should normally record such references in
1278 * their probe() methods, when they bind to a device, and release
1279 * them by calling pci_dev_put(), in their disconnect() methods.
1281 * A pointer to the device with the incremented reference counter is returned.
1283 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1286 get_device(&dev->dev);
1291 * pci_dev_put - release a use of the pci device structure
1292 * @dev: device that's been disconnected
1294 * Must be called when a user of a device is finished with it. When the last
1295 * user of the device calls this function, the memory of the device is freed.
1297 void pci_dev_put(struct pci_dev *dev)
1300 put_device(&dev->dev);
1303 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1305 struct pci_dev *pdev;
1310 pdev = to_pci_dev(dev);
1314 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1317 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1320 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1321 pdev->subsystem_device))
1324 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1327 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1328 pdev->vendor, pdev->device,
1329 pdev->subsystem_vendor, pdev->subsystem_device,
1330 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1336 struct bus_type pci_bus_type = {
1338 .match = pci_bus_match,
1339 .uevent = pci_uevent,
1340 .probe = pci_device_probe,
1341 .remove = pci_device_remove,
1342 .shutdown = pci_device_shutdown,
1343 .dev_groups = pci_dev_groups,
1344 .bus_groups = pci_bus_groups,
1345 .drv_groups = pci_drv_groups,
1346 .pm = PCI_PM_OPS_PTR,
1349 static int __init pci_driver_init(void)
1351 return bus_register(&pci_bus_type);
1354 postcore_initcall(pci_driver_init);
1356 EXPORT_SYMBOL_GPL(pci_add_dynid);
1357 EXPORT_SYMBOL(pci_match_id);
1358 EXPORT_SYMBOL(__pci_register_driver);
1359 EXPORT_SYMBOL(pci_unregister_driver);
1360 EXPORT_SYMBOL(pci_dev_driver);
1361 EXPORT_SYMBOL(pci_bus_type);
1362 EXPORT_SYMBOL(pci_dev_get);
1363 EXPORT_SYMBOL(pci_dev_put);