1 // SPDX-License-Identifier: GPL-2.0
4 * (C) Copyright 2007 Novell Inc.
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>
20 #include "pcie/portdrv.h"
23 struct list_head node;
24 struct pci_device_id id;
28 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
29 * @drv: target pci driver
30 * @vendor: PCI vendor ID
31 * @device: PCI device ID
32 * @subvendor: PCI subvendor ID
33 * @subdevice: PCI subdevice ID
35 * @class_mask: PCI class mask
36 * @driver_data: private driver data
38 * Adds a new dynamic pci device ID to this driver and causes the
39 * driver to probe for all devices again. @drv must have been
40 * registered prior to calling this function.
43 * Does GFP_KERNEL allocation.
46 * 0 on success, -errno on failure.
48 int pci_add_dynid(struct pci_driver *drv,
49 unsigned int vendor, unsigned int device,
50 unsigned int subvendor, unsigned int subdevice,
51 unsigned int class, unsigned int class_mask,
52 unsigned long driver_data)
54 struct pci_dynid *dynid;
56 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
60 dynid->id.vendor = vendor;
61 dynid->id.device = device;
62 dynid->id.subvendor = subvendor;
63 dynid->id.subdevice = subdevice;
64 dynid->id.class = class;
65 dynid->id.class_mask = class_mask;
66 dynid->id.driver_data = driver_data;
68 spin_lock(&drv->dynids.lock);
69 list_add_tail(&dynid->node, &drv->dynids.list);
70 spin_unlock(&drv->dynids.lock);
72 return driver_attach(&drv->driver);
74 EXPORT_SYMBOL_GPL(pci_add_dynid);
76 static void pci_free_dynids(struct pci_driver *drv)
78 struct pci_dynid *dynid, *n;
80 spin_lock(&drv->dynids.lock);
81 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
82 list_del(&dynid->node);
85 spin_unlock(&drv->dynids.lock);
89 * store_new_id - sysfs frontend to pci_add_dynid()
90 * @driver: target device driver
91 * @buf: buffer for scanning device ID data
94 * Allow PCI IDs to be added to an existing driver via sysfs.
96 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
99 struct pci_driver *pdrv = to_pci_driver(driver);
100 const struct pci_device_id *ids = pdrv->id_table;
101 __u32 vendor, device, subvendor = PCI_ANY_ID,
102 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
103 unsigned long driver_data = 0;
107 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
108 &vendor, &device, &subvendor, &subdevice,
109 &class, &class_mask, &driver_data);
114 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
118 pdev->vendor = vendor;
119 pdev->device = device;
120 pdev->subsystem_vendor = subvendor;
121 pdev->subsystem_device = subdevice;
124 if (pci_match_id(pdrv->id_table, pdev))
133 /* Only accept driver_data values that match an existing id_table
137 while (ids->vendor || ids->subvendor || ids->class_mask) {
138 if (driver_data == ids->driver_data) {
144 if (retval) /* No match */
148 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
149 class, class_mask, driver_data);
154 static DRIVER_ATTR_WO(new_id);
157 * store_remove_id - remove a PCI device ID from this driver
158 * @driver: target device driver
159 * @buf: buffer for scanning device ID data
162 * Removes a dynamic pci device ID to this driver.
164 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
167 struct pci_dynid *dynid, *n;
168 struct pci_driver *pdrv = to_pci_driver(driver);
169 __u32 vendor, device, subvendor = PCI_ANY_ID,
170 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
172 size_t retval = -ENODEV;
174 fields = sscanf(buf, "%x %x %x %x %x %x",
175 &vendor, &device, &subvendor, &subdevice,
176 &class, &class_mask);
180 spin_lock(&pdrv->dynids.lock);
181 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
182 struct pci_device_id *id = &dynid->id;
183 if ((id->vendor == vendor) &&
184 (id->device == device) &&
185 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
186 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
187 !((id->class ^ class) & class_mask)) {
188 list_del(&dynid->node);
194 spin_unlock(&pdrv->dynids.lock);
198 static DRIVER_ATTR_WO(remove_id);
200 static struct attribute *pci_drv_attrs[] = {
201 &driver_attr_new_id.attr,
202 &driver_attr_remove_id.attr,
205 ATTRIBUTE_GROUPS(pci_drv);
208 * pci_match_id - See if a pci device matches a given pci_id table
209 * @ids: array of PCI device id structures to search in
210 * @dev: the PCI device structure to match against.
212 * Used by a driver to check whether a PCI device present in the
213 * system is in its list of supported devices. Returns the matching
214 * pci_device_id structure or %NULL if there is no match.
216 * Deprecated, don't use this as it will not catch any dynamic ids
217 * that a driver might want to check for.
219 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
223 while (ids->vendor || ids->subvendor || ids->class_mask) {
224 if (pci_match_one_device(ids, dev))
231 EXPORT_SYMBOL(pci_match_id);
233 static const struct pci_device_id pci_device_id_any = {
234 .vendor = PCI_ANY_ID,
235 .device = PCI_ANY_ID,
236 .subvendor = PCI_ANY_ID,
237 .subdevice = PCI_ANY_ID,
241 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
242 * @drv: the PCI driver to match against
243 * @dev: the PCI device structure to match against
245 * Used by a driver to check whether a PCI device present in the
246 * system is in its list of supported devices. Returns the matching
247 * pci_device_id structure or %NULL if there is no match.
249 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
252 struct pci_dynid *dynid;
253 const struct pci_device_id *found_id = NULL;
255 /* When driver_override is set, only bind to the matching driver */
256 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
259 /* Look at the dynamic ids first, before the static ones */
260 spin_lock(&drv->dynids.lock);
261 list_for_each_entry(dynid, &drv->dynids.list, node) {
262 if (pci_match_one_device(&dynid->id, dev)) {
263 found_id = &dynid->id;
267 spin_unlock(&drv->dynids.lock);
270 found_id = pci_match_id(drv->id_table, dev);
272 /* driver_override will always match, send a dummy id */
273 if (!found_id && dev->driver_override)
274 found_id = &pci_device_id_any;
279 struct drv_dev_and_id {
280 struct pci_driver *drv;
282 const struct pci_device_id *id;
285 static long local_pci_probe(void *_ddi)
287 struct drv_dev_and_id *ddi = _ddi;
288 struct pci_dev *pci_dev = ddi->dev;
289 struct pci_driver *pci_drv = ddi->drv;
290 struct device *dev = &pci_dev->dev;
294 * Unbound PCI devices are always put in D0, regardless of
295 * runtime PM status. During probe, the device is set to
296 * active and the usage count is incremented. If the driver
297 * supports runtime PM, it should call pm_runtime_put_noidle(),
298 * or any other runtime PM helper function decrementing the usage
299 * count, in its probe routine and pm_runtime_get_noresume() in
300 * its remove routine.
302 pm_runtime_get_sync(dev);
303 pci_dev->driver = pci_drv;
304 rc = pci_drv->probe(pci_dev, ddi->id);
308 pci_dev->driver = NULL;
309 pm_runtime_put_sync(dev);
313 * Probe function should return < 0 for failure, 0 for success
314 * Treat values > 0 as success, but warn.
316 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
320 static bool pci_physfn_is_probed(struct pci_dev *dev)
322 #ifdef CONFIG_PCI_IOV
323 return dev->is_virtfn && dev->physfn->is_probed;
329 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
330 const struct pci_device_id *id)
332 int error, node, cpu;
333 struct drv_dev_and_id ddi = { drv, dev, id };
336 * Execute driver initialization on node where the device is
337 * attached. This way the driver likely allocates its local memory
340 node = dev_to_node(&dev->dev);
343 cpu_hotplug_disable();
346 * Prevent nesting work_on_cpu() for the case where a Virtual Function
347 * device is probed from work_on_cpu() of the Physical device.
349 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
350 pci_physfn_is_probed(dev))
353 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
355 if (cpu < nr_cpu_ids)
356 error = work_on_cpu(cpu, local_pci_probe, &ddi);
358 error = local_pci_probe(&ddi);
361 cpu_hotplug_enable();
366 * __pci_device_probe - check if a driver wants to claim a specific PCI device
367 * @drv: driver to call to check if it wants the PCI device
368 * @pci_dev: PCI device being probed
370 * returns 0 on success, else error.
371 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
373 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
375 const struct pci_device_id *id;
378 if (!pci_dev->driver && drv->probe) {
381 id = pci_match_device(drv, pci_dev);
383 error = pci_call_probe(drv, pci_dev, id);
388 int __weak pcibios_alloc_irq(struct pci_dev *dev)
393 void __weak pcibios_free_irq(struct pci_dev *dev)
397 #ifdef CONFIG_PCI_IOV
398 static inline bool pci_device_can_probe(struct pci_dev *pdev)
400 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe);
403 static inline bool pci_device_can_probe(struct pci_dev *pdev)
409 static int pci_device_probe(struct device *dev)
412 struct pci_dev *pci_dev = to_pci_dev(dev);
413 struct pci_driver *drv = to_pci_driver(dev->driver);
415 pci_assign_irq(pci_dev);
417 error = pcibios_alloc_irq(pci_dev);
421 pci_dev_get(pci_dev);
422 if (pci_device_can_probe(pci_dev)) {
423 error = __pci_device_probe(drv, pci_dev);
425 pcibios_free_irq(pci_dev);
426 pci_dev_put(pci_dev);
433 static int pci_device_remove(struct device *dev)
435 struct pci_dev *pci_dev = to_pci_dev(dev);
436 struct pci_driver *drv = pci_dev->driver;
440 pm_runtime_get_sync(dev);
441 drv->remove(pci_dev);
442 pm_runtime_put_noidle(dev);
444 pcibios_free_irq(pci_dev);
445 pci_dev->driver = NULL;
448 /* Undo the runtime PM settings in local_pci_probe() */
449 pm_runtime_put_sync(dev);
452 * If the device is still on, set the power state as "unknown",
453 * since it might change by the next time we load the driver.
455 if (pci_dev->current_state == PCI_D0)
456 pci_dev->current_state = PCI_UNKNOWN;
459 * We would love to complain here if pci_dev->is_enabled is set, that
460 * the driver should have called pci_disable_device(), but the
461 * unfortunate fact is there are too many odd BIOS and bridge setups
462 * that don't like drivers doing that all of the time.
463 * Oh well, we can dream of sane hardware when we sleep, no matter how
464 * horrible the crap we have to deal with is when we are awake...
467 pci_dev_put(pci_dev);
471 static void pci_device_shutdown(struct device *dev)
473 struct pci_dev *pci_dev = to_pci_dev(dev);
474 struct pci_driver *drv = pci_dev->driver;
476 pm_runtime_resume(dev);
478 if (drv && drv->shutdown)
479 drv->shutdown(pci_dev);
482 * If this is a kexec reboot, turn off Bus Master bit on the
483 * device to tell it to not continue to do DMA. Don't touch
484 * devices in D3cold or unknown states.
485 * If it is not a kexec reboot, firmware will hit the PCI
486 * devices with big hammer and stop their DMA any way.
488 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
489 pci_clear_master(pci_dev);
494 /* Auxiliary functions used for system resume and run-time resume. */
497 * pci_restore_standard_config - restore standard config registers of PCI device
498 * @pci_dev: PCI device to handle
500 static int pci_restore_standard_config(struct pci_dev *pci_dev)
502 pci_update_current_state(pci_dev, PCI_UNKNOWN);
504 if (pci_dev->current_state != PCI_D0) {
505 int error = pci_set_power_state(pci_dev, PCI_D0);
510 pci_restore_state(pci_dev);
511 pci_pme_restore(pci_dev);
517 #ifdef CONFIG_PM_SLEEP
519 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
521 pci_power_up(pci_dev);
522 pci_restore_state(pci_dev);
523 pci_pme_restore(pci_dev);
524 pci_fixup_device(pci_fixup_resume_early, pci_dev);
528 * Default "suspend" method for devices that have no driver provided suspend,
529 * or not even a driver at all (second part).
531 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
534 * mark its power state as "unknown", since we don't know if
535 * e.g. the BIOS will change its device state when we suspend.
537 if (pci_dev->current_state == PCI_D0)
538 pci_dev->current_state = PCI_UNKNOWN;
542 * Default "resume" method for devices that have no driver provided resume,
543 * or not even a driver at all (second part).
545 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
549 /* if the device was enabled before suspend, reenable */
550 retval = pci_reenable_device(pci_dev);
552 * if the device was busmaster before the suspend, make it busmaster
555 if (pci_dev->is_busmaster)
556 pci_set_master(pci_dev);
561 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
563 struct pci_dev *pci_dev = to_pci_dev(dev);
564 struct pci_driver *drv = pci_dev->driver;
566 if (drv && drv->suspend) {
567 pci_power_t prev = pci_dev->current_state;
570 error = drv->suspend(pci_dev, state);
571 suspend_report_result(drv->suspend, error);
575 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
576 && pci_dev->current_state != PCI_UNKNOWN) {
577 WARN_ONCE(pci_dev->current_state != prev,
578 "PCI PM: Device state not saved by %pF\n",
583 pci_fixup_device(pci_fixup_suspend, pci_dev);
588 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
590 struct pci_dev *pci_dev = to_pci_dev(dev);
591 struct pci_driver *drv = pci_dev->driver;
593 if (drv && drv->suspend_late) {
594 pci_power_t prev = pci_dev->current_state;
597 error = drv->suspend_late(pci_dev, state);
598 suspend_report_result(drv->suspend_late, error);
602 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
603 && pci_dev->current_state != PCI_UNKNOWN) {
604 WARN_ONCE(pci_dev->current_state != prev,
605 "PCI PM: Device state not saved by %pF\n",
611 if (!pci_dev->state_saved)
612 pci_save_state(pci_dev);
614 pci_pm_set_unknown_state(pci_dev);
617 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
622 static int pci_legacy_resume_early(struct device *dev)
624 struct pci_dev *pci_dev = to_pci_dev(dev);
625 struct pci_driver *drv = pci_dev->driver;
627 return drv && drv->resume_early ?
628 drv->resume_early(pci_dev) : 0;
631 static int pci_legacy_resume(struct device *dev)
633 struct pci_dev *pci_dev = to_pci_dev(dev);
634 struct pci_driver *drv = pci_dev->driver;
636 pci_fixup_device(pci_fixup_resume, pci_dev);
638 return drv && drv->resume ?
639 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
642 /* Auxiliary functions used by the new power management framework */
644 static void pci_pm_default_resume(struct pci_dev *pci_dev)
646 pci_fixup_device(pci_fixup_resume, pci_dev);
647 pci_enable_wake(pci_dev, PCI_D0, false);
650 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
652 /* Disable non-bridge devices without PM support */
653 if (!pci_has_subordinate(pci_dev))
654 pci_disable_enabled_device(pci_dev);
657 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
659 struct pci_driver *drv = pci_dev->driver;
660 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
661 || drv->resume_early);
664 * Legacy PM support is used by default, so warn if the new framework is
665 * supported as well. Drivers are supposed to support either the
666 * former, or the latter, but not both at the same time.
668 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
669 drv->name, pci_dev->vendor, pci_dev->device);
674 /* New power management framework */
676 static int pci_pm_prepare(struct device *dev)
678 struct device_driver *drv = dev->driver;
680 if (drv && drv->pm && drv->pm->prepare) {
681 int error = drv->pm->prepare(dev);
685 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
688 return pci_dev_keep_suspended(to_pci_dev(dev));
691 static void pci_pm_complete(struct device *dev)
693 struct pci_dev *pci_dev = to_pci_dev(dev);
695 pci_dev_complete_resume(pci_dev);
696 pm_generic_complete(dev);
698 /* Resume device if platform firmware has put it in reset-power-on */
699 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
700 pci_power_t pre_sleep_state = pci_dev->current_state;
702 pci_update_current_state(pci_dev, pci_dev->current_state);
703 if (pci_dev->current_state < pre_sleep_state)
704 pm_request_resume(dev);
708 #else /* !CONFIG_PM_SLEEP */
710 #define pci_pm_prepare NULL
711 #define pci_pm_complete NULL
713 #endif /* !CONFIG_PM_SLEEP */
715 #ifdef CONFIG_SUSPEND
716 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
719 * Some BIOSes forget to clear Root PME Status bits after system
720 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
721 * Clear those bits now just in case (shouldn't hurt).
723 if (pci_is_pcie(pci_dev) &&
724 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
725 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
726 pcie_clear_root_pme_status(pci_dev);
729 static int pci_pm_suspend(struct device *dev)
731 struct pci_dev *pci_dev = to_pci_dev(dev);
732 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
734 if (pci_has_legacy_pm_support(pci_dev))
735 return pci_legacy_suspend(dev, PMSG_SUSPEND);
738 pci_pm_default_suspend(pci_dev);
743 * PCI devices suspended at run time may need to be resumed at this
744 * point, because in general it may be necessary to reconfigure them for
745 * system suspend. Namely, if the device is expected to wake up the
746 * system from the sleep state, it may have to be reconfigured for this
747 * purpose, or if the device is not expected to wake up the system from
748 * the sleep state, it should be prevented from signaling wakeup events
751 * Also if the driver of the device does not indicate that its system
752 * suspend callbacks can cope with runtime-suspended devices, it is
753 * better to resume the device from runtime suspend here.
755 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
756 !pci_dev_keep_suspended(pci_dev))
757 pm_runtime_resume(dev);
759 pci_dev->state_saved = false;
761 pci_power_t prev = pci_dev->current_state;
764 error = pm->suspend(dev);
765 suspend_report_result(pm->suspend, error);
769 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
770 && pci_dev->current_state != PCI_UNKNOWN) {
771 WARN_ONCE(pci_dev->current_state != prev,
772 "PCI PM: State of device not saved by %pF\n",
780 static int pci_pm_suspend_late(struct device *dev)
782 if (dev_pm_smart_suspend_and_suspended(dev))
785 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
787 return pm_generic_suspend_late(dev);
790 static int pci_pm_suspend_noirq(struct device *dev)
792 struct pci_dev *pci_dev = to_pci_dev(dev);
793 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
795 if (dev_pm_smart_suspend_and_suspended(dev)) {
796 dev->power.may_skip_resume = true;
800 if (pci_has_legacy_pm_support(pci_dev))
801 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
804 pci_save_state(pci_dev);
808 if (pm->suspend_noirq) {
809 pci_power_t prev = pci_dev->current_state;
812 error = pm->suspend_noirq(dev);
813 suspend_report_result(pm->suspend_noirq, error);
817 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
818 && pci_dev->current_state != PCI_UNKNOWN) {
819 WARN_ONCE(pci_dev->current_state != prev,
820 "PCI PM: State of device not saved by %pF\n",
826 if (!pci_dev->state_saved) {
827 pci_save_state(pci_dev);
828 if (pci_power_manageable(pci_dev))
829 pci_prepare_to_sleep(pci_dev);
832 dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
833 pci_power_name(pci_dev->current_state));
835 pci_pm_set_unknown_state(pci_dev);
838 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
839 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
840 * hasn't been quiesced and tries to turn it off. If the controller
841 * is already in D3, this can hang or cause memory corruption.
843 * Since the value of the COMMAND register doesn't matter once the
844 * device has been suspended, we can safely set it to 0 here.
846 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
847 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
850 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
853 * If the target system sleep state is suspend-to-idle, it is sufficient
854 * to check whether or not the device's wakeup settings are good for
855 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
856 * pci_pm_complete() to take care of fixing up the device's state
857 * anyway, if need be.
859 dev->power.may_skip_resume = device_may_wakeup(dev) ||
860 !device_can_wakeup(dev);
865 static int pci_pm_resume_noirq(struct device *dev)
867 struct pci_dev *pci_dev = to_pci_dev(dev);
868 struct device_driver *drv = dev->driver;
871 if (dev_pm_may_skip_resume(dev))
875 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
876 * during system suspend, so update their runtime PM status to "active"
877 * as they are going to be put into D0 shortly.
879 if (dev_pm_smart_suspend_and_suspended(dev))
880 pm_runtime_set_active(dev);
882 pci_pm_default_resume_early(pci_dev);
884 if (pci_has_legacy_pm_support(pci_dev))
885 return pci_legacy_resume_early(dev);
887 pcie_pme_root_status_cleanup(pci_dev);
889 if (drv && drv->pm && drv->pm->resume_noirq)
890 error = drv->pm->resume_noirq(dev);
895 static int pci_pm_resume(struct device *dev)
897 struct pci_dev *pci_dev = to_pci_dev(dev);
898 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
902 * This is necessary for the suspend error path in which resume is
903 * called without restoring the standard config registers of the device.
905 if (pci_dev->state_saved)
906 pci_restore_standard_config(pci_dev);
908 if (pci_has_legacy_pm_support(pci_dev))
909 return pci_legacy_resume(dev);
911 pci_pm_default_resume(pci_dev);
915 error = pm->resume(dev);
917 pci_pm_reenable_device(pci_dev);
923 #else /* !CONFIG_SUSPEND */
925 #define pci_pm_suspend NULL
926 #define pci_pm_suspend_late NULL
927 #define pci_pm_suspend_noirq NULL
928 #define pci_pm_resume NULL
929 #define pci_pm_resume_noirq NULL
931 #endif /* !CONFIG_SUSPEND */
933 #ifdef CONFIG_HIBERNATE_CALLBACKS
937 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
938 * a hibernate transition
940 struct dev_pm_ops __weak pcibios_pm_ops;
942 static int pci_pm_freeze(struct device *dev)
944 struct pci_dev *pci_dev = to_pci_dev(dev);
945 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
947 if (pci_has_legacy_pm_support(pci_dev))
948 return pci_legacy_suspend(dev, PMSG_FREEZE);
951 pci_pm_default_suspend(pci_dev);
956 * This used to be done in pci_pm_prepare() for all devices and some
957 * drivers may depend on it, so do it here. Ideally, runtime-suspended
958 * devices should not be touched during freeze/thaw transitions,
961 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND))
962 pm_runtime_resume(dev);
964 pci_dev->state_saved = false;
968 error = pm->freeze(dev);
969 suspend_report_result(pm->freeze, error);
977 static int pci_pm_freeze_late(struct device *dev)
979 if (dev_pm_smart_suspend_and_suspended(dev))
982 return pm_generic_freeze_late(dev);
985 static int pci_pm_freeze_noirq(struct device *dev)
987 struct pci_dev *pci_dev = to_pci_dev(dev);
988 struct device_driver *drv = dev->driver;
990 if (dev_pm_smart_suspend_and_suspended(dev))
993 if (pci_has_legacy_pm_support(pci_dev))
994 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
996 if (drv && drv->pm && drv->pm->freeze_noirq) {
999 error = drv->pm->freeze_noirq(dev);
1000 suspend_report_result(drv->pm->freeze_noirq, error);
1005 if (!pci_dev->state_saved)
1006 pci_save_state(pci_dev);
1008 pci_pm_set_unknown_state(pci_dev);
1010 if (pcibios_pm_ops.freeze_noirq)
1011 return pcibios_pm_ops.freeze_noirq(dev);
1016 static int pci_pm_thaw_noirq(struct device *dev)
1018 struct pci_dev *pci_dev = to_pci_dev(dev);
1019 struct device_driver *drv = dev->driver;
1023 * If the device is in runtime suspend, the code below may not work
1024 * correctly with it, so skip that code and make the PM core skip all of
1025 * the subsequent "thaw" callbacks for the device.
1027 if (dev_pm_smart_suspend_and_suspended(dev)) {
1028 dev_pm_skip_next_resume_phases(dev);
1032 if (pcibios_pm_ops.thaw_noirq) {
1033 error = pcibios_pm_ops.thaw_noirq(dev);
1038 if (pci_has_legacy_pm_support(pci_dev))
1039 return pci_legacy_resume_early(dev);
1042 * pci_restore_state() requires the device to be in D0 (because of MSI
1043 * restoration among other things), so force it into D0 in case the
1044 * driver's "freeze" callbacks put it into a low-power state directly.
1046 pci_set_power_state(pci_dev, PCI_D0);
1047 pci_restore_state(pci_dev);
1049 if (drv && drv->pm && drv->pm->thaw_noirq)
1050 error = drv->pm->thaw_noirq(dev);
1055 static int pci_pm_thaw(struct device *dev)
1057 struct pci_dev *pci_dev = to_pci_dev(dev);
1058 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1061 if (pci_has_legacy_pm_support(pci_dev))
1062 return pci_legacy_resume(dev);
1066 error = pm->thaw(dev);
1068 pci_pm_reenable_device(pci_dev);
1071 pci_dev->state_saved = false;
1076 static int pci_pm_poweroff(struct device *dev)
1078 struct pci_dev *pci_dev = to_pci_dev(dev);
1079 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1081 if (pci_has_legacy_pm_support(pci_dev))
1082 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1085 pci_pm_default_suspend(pci_dev);
1089 /* The reason to do that is the same as in pci_pm_suspend(). */
1090 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1091 !pci_dev_keep_suspended(pci_dev))
1092 pm_runtime_resume(dev);
1094 pci_dev->state_saved = false;
1098 error = pm->poweroff(dev);
1099 suspend_report_result(pm->poweroff, error);
1107 static int pci_pm_poweroff_late(struct device *dev)
1109 if (dev_pm_smart_suspend_and_suspended(dev))
1112 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1114 return pm_generic_poweroff_late(dev);
1117 static int pci_pm_poweroff_noirq(struct device *dev)
1119 struct pci_dev *pci_dev = to_pci_dev(dev);
1120 struct device_driver *drv = dev->driver;
1122 if (dev_pm_smart_suspend_and_suspended(dev))
1125 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1126 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1128 if (!drv || !drv->pm) {
1129 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1133 if (drv->pm->poweroff_noirq) {
1136 error = drv->pm->poweroff_noirq(dev);
1137 suspend_report_result(drv->pm->poweroff_noirq, error);
1142 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1143 pci_prepare_to_sleep(pci_dev);
1146 * The reason for doing this here is the same as for the analogous code
1147 * in pci_pm_suspend_noirq().
1149 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1150 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1152 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1154 if (pcibios_pm_ops.poweroff_noirq)
1155 return pcibios_pm_ops.poweroff_noirq(dev);
1160 static int pci_pm_restore_noirq(struct device *dev)
1162 struct pci_dev *pci_dev = to_pci_dev(dev);
1163 struct device_driver *drv = dev->driver;
1166 /* This is analogous to the pci_pm_resume_noirq() case. */
1167 if (dev_pm_smart_suspend_and_suspended(dev))
1168 pm_runtime_set_active(dev);
1170 if (pcibios_pm_ops.restore_noirq) {
1171 error = pcibios_pm_ops.restore_noirq(dev);
1176 pci_pm_default_resume_early(pci_dev);
1178 if (pci_has_legacy_pm_support(pci_dev))
1179 return pci_legacy_resume_early(dev);
1181 if (drv && drv->pm && drv->pm->restore_noirq)
1182 error = drv->pm->restore_noirq(dev);
1187 static int pci_pm_restore(struct device *dev)
1189 struct pci_dev *pci_dev = to_pci_dev(dev);
1190 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1194 * This is necessary for the hibernation error path in which restore is
1195 * called without restoring the standard config registers of the device.
1197 if (pci_dev->state_saved)
1198 pci_restore_standard_config(pci_dev);
1200 if (pci_has_legacy_pm_support(pci_dev))
1201 return pci_legacy_resume(dev);
1203 pci_pm_default_resume(pci_dev);
1207 error = pm->restore(dev);
1209 pci_pm_reenable_device(pci_dev);
1215 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1217 #define pci_pm_freeze NULL
1218 #define pci_pm_freeze_late NULL
1219 #define pci_pm_freeze_noirq NULL
1220 #define pci_pm_thaw NULL
1221 #define pci_pm_thaw_noirq NULL
1222 #define pci_pm_poweroff NULL
1223 #define pci_pm_poweroff_late NULL
1224 #define pci_pm_poweroff_noirq NULL
1225 #define pci_pm_restore NULL
1226 #define pci_pm_restore_noirq NULL
1228 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1232 static int pci_pm_runtime_suspend(struct device *dev)
1234 struct pci_dev *pci_dev = to_pci_dev(dev);
1235 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1236 pci_power_t prev = pci_dev->current_state;
1240 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1241 * but it may go to D3cold when the bridge above it runtime suspends.
1242 * Save its config space in case that happens.
1244 if (!pci_dev->driver) {
1245 pci_save_state(pci_dev);
1249 if (!pm || !pm->runtime_suspend)
1252 pci_dev->state_saved = false;
1253 error = pm->runtime_suspend(dev);
1256 * -EBUSY and -EAGAIN is used to request the runtime PM core
1257 * to schedule a new suspend, so log the event only with debug
1260 if (error == -EBUSY || error == -EAGAIN)
1261 dev_dbg(dev, "can't suspend now (%pf returned %d)\n",
1262 pm->runtime_suspend, error);
1264 dev_err(dev, "can't suspend (%pf returned %d)\n",
1265 pm->runtime_suspend, error);
1270 pci_fixup_device(pci_fixup_suspend, pci_dev);
1272 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1273 && pci_dev->current_state != PCI_UNKNOWN) {
1274 WARN_ONCE(pci_dev->current_state != prev,
1275 "PCI PM: State of device not saved by %pF\n",
1276 pm->runtime_suspend);
1280 if (!pci_dev->state_saved) {
1281 pci_save_state(pci_dev);
1282 pci_finish_runtime_suspend(pci_dev);
1288 static int pci_pm_runtime_resume(struct device *dev)
1291 struct pci_dev *pci_dev = to_pci_dev(dev);
1292 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1295 * Restoring config space is necessary even if the device is not bound
1296 * to a driver because although we left it in D0, it may have gone to
1297 * D3cold when the bridge above it runtime suspended.
1299 pci_restore_standard_config(pci_dev);
1301 if (!pci_dev->driver)
1304 if (!pm || !pm->runtime_resume)
1307 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1308 pci_enable_wake(pci_dev, PCI_D0, false);
1309 pci_fixup_device(pci_fixup_resume, pci_dev);
1311 rc = pm->runtime_resume(dev);
1313 pci_dev->runtime_d3cold = false;
1318 static int pci_pm_runtime_idle(struct device *dev)
1320 struct pci_dev *pci_dev = to_pci_dev(dev);
1321 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1325 * If pci_dev->driver is not set (unbound), the device should
1326 * always remain in D0 regardless of the runtime PM status
1328 if (!pci_dev->driver)
1334 if (pm->runtime_idle)
1335 ret = pm->runtime_idle(dev);
1340 static const struct dev_pm_ops pci_dev_pm_ops = {
1341 .prepare = pci_pm_prepare,
1342 .complete = pci_pm_complete,
1343 .suspend = pci_pm_suspend,
1344 .suspend_late = pci_pm_suspend_late,
1345 .resume = pci_pm_resume,
1346 .freeze = pci_pm_freeze,
1347 .freeze_late = pci_pm_freeze_late,
1348 .thaw = pci_pm_thaw,
1349 .poweroff = pci_pm_poweroff,
1350 .poweroff_late = pci_pm_poweroff_late,
1351 .restore = pci_pm_restore,
1352 .suspend_noirq = pci_pm_suspend_noirq,
1353 .resume_noirq = pci_pm_resume_noirq,
1354 .freeze_noirq = pci_pm_freeze_noirq,
1355 .thaw_noirq = pci_pm_thaw_noirq,
1356 .poweroff_noirq = pci_pm_poweroff_noirq,
1357 .restore_noirq = pci_pm_restore_noirq,
1358 .runtime_suspend = pci_pm_runtime_suspend,
1359 .runtime_resume = pci_pm_runtime_resume,
1360 .runtime_idle = pci_pm_runtime_idle,
1363 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1365 #else /* !CONFIG_PM */
1367 #define pci_pm_runtime_suspend NULL
1368 #define pci_pm_runtime_resume NULL
1369 #define pci_pm_runtime_idle NULL
1371 #define PCI_PM_OPS_PTR NULL
1373 #endif /* !CONFIG_PM */
1376 * __pci_register_driver - register a new pci driver
1377 * @drv: the driver structure to register
1378 * @owner: owner module of drv
1379 * @mod_name: module name string
1381 * Adds the driver structure to the list of registered drivers.
1382 * Returns a negative value on error, otherwise 0.
1383 * If no error occurred, the driver remains registered even if
1384 * no device was claimed during registration.
1386 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1387 const char *mod_name)
1389 /* initialize common driver fields */
1390 drv->driver.name = drv->name;
1391 drv->driver.bus = &pci_bus_type;
1392 drv->driver.owner = owner;
1393 drv->driver.mod_name = mod_name;
1394 drv->driver.groups = drv->groups;
1396 spin_lock_init(&drv->dynids.lock);
1397 INIT_LIST_HEAD(&drv->dynids.list);
1399 /* register with core */
1400 return driver_register(&drv->driver);
1402 EXPORT_SYMBOL(__pci_register_driver);
1405 * pci_unregister_driver - unregister a pci driver
1406 * @drv: the driver structure to unregister
1408 * Deletes the driver structure from the list of registered PCI drivers,
1409 * gives it a chance to clean up by calling its remove() function for
1410 * each device it was responsible for, and marks those devices as
1414 void pci_unregister_driver(struct pci_driver *drv)
1416 driver_unregister(&drv->driver);
1417 pci_free_dynids(drv);
1419 EXPORT_SYMBOL(pci_unregister_driver);
1421 static struct pci_driver pci_compat_driver = {
1426 * pci_dev_driver - get the pci_driver of a device
1427 * @dev: the device to query
1429 * Returns the appropriate pci_driver structure or %NULL if there is no
1430 * registered driver for the device.
1432 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1438 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1439 if (dev->resource[i].flags & IORESOURCE_BUSY)
1440 return &pci_compat_driver;
1444 EXPORT_SYMBOL(pci_dev_driver);
1447 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1448 * @dev: the PCI device structure to match against
1449 * @drv: the device driver to search for matching PCI device id structures
1451 * Used by a driver to check whether a PCI device present in the
1452 * system is in its list of supported devices. Returns the matching
1453 * pci_device_id structure or %NULL if there is no match.
1455 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1457 struct pci_dev *pci_dev = to_pci_dev(dev);
1458 struct pci_driver *pci_drv;
1459 const struct pci_device_id *found_id;
1461 if (!pci_dev->match_driver)
1464 pci_drv = to_pci_driver(drv);
1465 found_id = pci_match_device(pci_drv, pci_dev);
1473 * pci_dev_get - increments the reference count of the pci device structure
1474 * @dev: the device being referenced
1476 * Each live reference to a device should be refcounted.
1478 * Drivers for PCI devices should normally record such references in
1479 * their probe() methods, when they bind to a device, and release
1480 * them by calling pci_dev_put(), in their disconnect() methods.
1482 * A pointer to the device with the incremented reference counter is returned.
1484 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1487 get_device(&dev->dev);
1490 EXPORT_SYMBOL(pci_dev_get);
1493 * pci_dev_put - release a use of the pci device structure
1494 * @dev: device that's been disconnected
1496 * Must be called when a user of a device is finished with it. When the last
1497 * user of the device calls this function, the memory of the device is freed.
1499 void pci_dev_put(struct pci_dev *dev)
1502 put_device(&dev->dev);
1504 EXPORT_SYMBOL(pci_dev_put);
1506 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1508 struct pci_dev *pdev;
1513 pdev = to_pci_dev(dev);
1515 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1518 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1521 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1522 pdev->subsystem_device))
1525 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1528 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1529 pdev->vendor, pdev->device,
1530 pdev->subsystem_vendor, pdev->subsystem_device,
1531 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1538 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1540 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1541 * @pdev: PCI device undergoing error recovery
1542 * @err_type: type of error event
1544 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1550 case PCI_ERS_RESULT_NONE:
1551 case PCI_ERS_RESULT_CAN_RECOVER:
1552 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1553 envp[idx++] = "DEVICE_ONLINE=0";
1555 case PCI_ERS_RESULT_RECOVERED:
1556 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1557 envp[idx++] = "DEVICE_ONLINE=1";
1559 case PCI_ERS_RESULT_DISCONNECT:
1560 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1561 envp[idx++] = "DEVICE_ONLINE=0";
1569 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1574 static int pci_bus_num_vf(struct device *dev)
1576 return pci_num_vf(to_pci_dev(dev));
1579 struct bus_type pci_bus_type = {
1581 .match = pci_bus_match,
1582 .uevent = pci_uevent,
1583 .probe = pci_device_probe,
1584 .remove = pci_device_remove,
1585 .shutdown = pci_device_shutdown,
1586 .dev_groups = pci_dev_groups,
1587 .bus_groups = pci_bus_groups,
1588 .drv_groups = pci_drv_groups,
1589 .pm = PCI_PM_OPS_PTR,
1590 .num_vf = pci_bus_num_vf,
1593 EXPORT_SYMBOL(pci_bus_type);
1595 #ifdef CONFIG_PCIEPORTBUS
1596 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1598 struct pcie_device *pciedev;
1599 struct pcie_port_service_driver *driver;
1601 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1604 pciedev = to_pcie_device(dev);
1605 driver = to_service_driver(drv);
1607 if (driver->service != pciedev->service)
1610 if (driver->port_type != PCIE_ANY_PORT &&
1611 driver->port_type != pci_pcie_type(pciedev->port))
1617 struct bus_type pcie_port_bus_type = {
1618 .name = "pci_express",
1619 .match = pcie_port_bus_match,
1621 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1624 static int __init pci_driver_init(void)
1628 ret = bus_register(&pci_bus_type);
1632 #ifdef CONFIG_PCIEPORTBUS
1633 ret = bus_register(&pcie_port_bus_type);
1640 postcore_initcall(pci_driver_init);