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/sched/isolation.h>
16 #include <linux/cpu.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/suspend.h>
19 #include <linux/kexec.h>
20 #include <linux/of_device.h>
21 #include <linux/acpi.h>
22 #include <linux/dma-map-ops.h>
23 #include <linux/iommu.h>
25 #include "pcie/portdrv.h"
28 struct list_head node;
29 struct pci_device_id id;
33 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
34 * @drv: target pci driver
35 * @vendor: PCI vendor ID
36 * @device: PCI device ID
37 * @subvendor: PCI subvendor ID
38 * @subdevice: PCI subdevice ID
40 * @class_mask: PCI class mask
41 * @driver_data: private driver data
43 * Adds a new dynamic pci device ID to this driver and causes the
44 * driver to probe for all devices again. @drv must have been
45 * registered prior to calling this function.
48 * Does GFP_KERNEL allocation.
51 * 0 on success, -errno on failure.
53 int pci_add_dynid(struct pci_driver *drv,
54 unsigned int vendor, unsigned int device,
55 unsigned int subvendor, unsigned int subdevice,
56 unsigned int class, unsigned int class_mask,
57 unsigned long driver_data)
59 struct pci_dynid *dynid;
61 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
65 dynid->id.vendor = vendor;
66 dynid->id.device = device;
67 dynid->id.subvendor = subvendor;
68 dynid->id.subdevice = subdevice;
69 dynid->id.class = class;
70 dynid->id.class_mask = class_mask;
71 dynid->id.driver_data = driver_data;
73 spin_lock(&drv->dynids.lock);
74 list_add_tail(&dynid->node, &drv->dynids.list);
75 spin_unlock(&drv->dynids.lock);
77 return driver_attach(&drv->driver);
79 EXPORT_SYMBOL_GPL(pci_add_dynid);
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 * pci_match_id - See if a PCI device matches a given pci_id table
95 * @ids: array of PCI device ID structures to search in
96 * @dev: the PCI device structure to match against.
98 * Used by a driver to check whether a PCI device is in its list of
99 * supported devices. Returns the matching pci_device_id structure or
100 * %NULL if there is no match.
102 * Deprecated; don't use this as it will not catch any dynamic IDs
103 * that a driver might want to check for.
105 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
109 while (ids->vendor || ids->subvendor || ids->class_mask) {
110 if (pci_match_one_device(ids, dev))
117 EXPORT_SYMBOL(pci_match_id);
119 static const struct pci_device_id pci_device_id_any = {
120 .vendor = PCI_ANY_ID,
121 .device = PCI_ANY_ID,
122 .subvendor = PCI_ANY_ID,
123 .subdevice = PCI_ANY_ID,
127 * pci_match_device - See if a device matches a driver's list of IDs
128 * @drv: the PCI driver to match against
129 * @dev: the PCI device structure to match against
131 * Used by a driver to check whether a PCI device is in its list of
132 * supported devices or in the dynids list, which may have been augmented
133 * via the sysfs "new_id" file. Returns the matching pci_device_id
134 * structure or %NULL if there is no match.
136 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
139 struct pci_dynid *dynid;
140 const struct pci_device_id *found_id = NULL, *ids;
142 /* When driver_override is set, only bind to the matching driver */
143 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
146 /* Look at the dynamic ids first, before the static ones */
147 spin_lock(&drv->dynids.lock);
148 list_for_each_entry(dynid, &drv->dynids.list, node) {
149 if (pci_match_one_device(&dynid->id, dev)) {
150 found_id = &dynid->id;
154 spin_unlock(&drv->dynids.lock);
159 for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
160 ids = found_id + 1) {
162 * The match table is split based on driver_override.
163 * In case override_only was set, enforce driver_override
166 if (found_id->override_only) {
167 if (dev->driver_override)
174 /* driver_override will always match, send a dummy id */
175 if (dev->driver_override)
176 return &pci_device_id_any;
181 * new_id_store - sysfs frontend to pci_add_dynid()
182 * @driver: target device driver
183 * @buf: buffer for scanning device ID data
186 * Allow PCI IDs to be added to an existing driver via sysfs.
188 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
191 struct pci_driver *pdrv = to_pci_driver(driver);
192 const struct pci_device_id *ids = pdrv->id_table;
193 u32 vendor, device, subvendor = PCI_ANY_ID,
194 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
195 unsigned long driver_data = 0;
199 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
200 &vendor, &device, &subvendor, &subdevice,
201 &class, &class_mask, &driver_data);
206 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
210 pdev->vendor = vendor;
211 pdev->device = device;
212 pdev->subsystem_vendor = subvendor;
213 pdev->subsystem_device = subdevice;
216 if (pci_match_device(pdrv, pdev))
225 /* Only accept driver_data values that match an existing id_table
229 while (ids->vendor || ids->subvendor || ids->class_mask) {
230 if (driver_data == ids->driver_data) {
236 if (retval) /* No match */
240 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
241 class, class_mask, driver_data);
246 static DRIVER_ATTR_WO(new_id);
249 * remove_id_store - remove a PCI device ID from this driver
250 * @driver: target device driver
251 * @buf: buffer for scanning device ID data
254 * Removes a dynamic pci device ID to this driver.
256 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
259 struct pci_dynid *dynid, *n;
260 struct pci_driver *pdrv = to_pci_driver(driver);
261 u32 vendor, device, subvendor = PCI_ANY_ID,
262 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
264 size_t retval = -ENODEV;
266 fields = sscanf(buf, "%x %x %x %x %x %x",
267 &vendor, &device, &subvendor, &subdevice,
268 &class, &class_mask);
272 spin_lock(&pdrv->dynids.lock);
273 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
274 struct pci_device_id *id = &dynid->id;
275 if ((id->vendor == vendor) &&
276 (id->device == device) &&
277 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
278 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
279 !((id->class ^ class) & class_mask)) {
280 list_del(&dynid->node);
286 spin_unlock(&pdrv->dynids.lock);
290 static DRIVER_ATTR_WO(remove_id);
292 static struct attribute *pci_drv_attrs[] = {
293 &driver_attr_new_id.attr,
294 &driver_attr_remove_id.attr,
297 ATTRIBUTE_GROUPS(pci_drv);
299 struct drv_dev_and_id {
300 struct pci_driver *drv;
302 const struct pci_device_id *id;
305 static long local_pci_probe(void *_ddi)
307 struct drv_dev_and_id *ddi = _ddi;
308 struct pci_dev *pci_dev = ddi->dev;
309 struct pci_driver *pci_drv = ddi->drv;
310 struct device *dev = &pci_dev->dev;
314 * Unbound PCI devices are always put in D0, regardless of
315 * runtime PM status. During probe, the device is set to
316 * active and the usage count is incremented. If the driver
317 * supports runtime PM, it should call pm_runtime_put_noidle(),
318 * or any other runtime PM helper function decrementing the usage
319 * count, in its probe routine and pm_runtime_get_noresume() in
320 * its remove routine.
322 pm_runtime_get_sync(dev);
323 pci_dev->driver = pci_drv;
324 rc = pci_drv->probe(pci_dev, ddi->id);
328 pci_dev->driver = NULL;
329 pm_runtime_put_sync(dev);
333 * Probe function should return < 0 for failure, 0 for success
334 * Treat values > 0 as success, but warn.
336 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
341 static bool pci_physfn_is_probed(struct pci_dev *dev)
343 #ifdef CONFIG_PCI_IOV
344 return dev->is_virtfn && dev->physfn->is_probed;
350 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
351 const struct pci_device_id *id)
353 int error, node, cpu;
354 struct drv_dev_and_id ddi = { drv, dev, id };
357 * Execute driver initialization on node where the device is
358 * attached. This way the driver likely allocates its local memory
361 node = dev_to_node(&dev->dev);
364 cpu_hotplug_disable();
367 * Prevent nesting work_on_cpu() for the case where a Virtual Function
368 * device is probed from work_on_cpu() of the Physical device.
370 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
371 pci_physfn_is_probed(dev)) {
374 cpumask_var_t wq_domain_mask;
376 if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
380 cpumask_and(wq_domain_mask,
381 housekeeping_cpumask(HK_TYPE_WQ),
382 housekeeping_cpumask(HK_TYPE_DOMAIN));
384 cpu = cpumask_any_and(cpumask_of_node(node),
386 free_cpumask_var(wq_domain_mask);
389 if (cpu < nr_cpu_ids)
390 error = work_on_cpu(cpu, local_pci_probe, &ddi);
392 error = local_pci_probe(&ddi);
395 cpu_hotplug_enable();
400 * __pci_device_probe - check if a driver wants to claim a specific PCI device
401 * @drv: driver to call to check if it wants the PCI device
402 * @pci_dev: PCI device being probed
404 * returns 0 on success, else error.
405 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
407 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
409 const struct pci_device_id *id;
415 id = pci_match_device(drv, pci_dev);
417 error = pci_call_probe(drv, pci_dev, id);
422 int __weak pcibios_alloc_irq(struct pci_dev *dev)
427 void __weak pcibios_free_irq(struct pci_dev *dev)
431 #ifdef CONFIG_PCI_IOV
432 static inline bool pci_device_can_probe(struct pci_dev *pdev)
434 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
435 pdev->driver_override);
438 static inline bool pci_device_can_probe(struct pci_dev *pdev)
444 static int pci_device_probe(struct device *dev)
447 struct pci_dev *pci_dev = to_pci_dev(dev);
448 struct pci_driver *drv = to_pci_driver(dev->driver);
450 if (!pci_device_can_probe(pci_dev))
453 pci_assign_irq(pci_dev);
455 error = pcibios_alloc_irq(pci_dev);
459 pci_dev_get(pci_dev);
460 error = __pci_device_probe(drv, pci_dev);
462 pcibios_free_irq(pci_dev);
463 pci_dev_put(pci_dev);
469 static void pci_device_remove(struct device *dev)
471 struct pci_dev *pci_dev = to_pci_dev(dev);
472 struct pci_driver *drv = pci_dev->driver;
475 pm_runtime_get_sync(dev);
476 drv->remove(pci_dev);
477 pm_runtime_put_noidle(dev);
479 pcibios_free_irq(pci_dev);
480 pci_dev->driver = NULL;
481 pci_iov_remove(pci_dev);
483 /* Undo the runtime PM settings in local_pci_probe() */
484 pm_runtime_put_sync(dev);
487 * If the device is still on, set the power state as "unknown",
488 * since it might change by the next time we load the driver.
490 if (pci_dev->current_state == PCI_D0)
491 pci_dev->current_state = PCI_UNKNOWN;
494 * We would love to complain here if pci_dev->is_enabled is set, that
495 * the driver should have called pci_disable_device(), but the
496 * unfortunate fact is there are too many odd BIOS and bridge setups
497 * that don't like drivers doing that all of the time.
498 * Oh well, we can dream of sane hardware when we sleep, no matter how
499 * horrible the crap we have to deal with is when we are awake...
502 pci_dev_put(pci_dev);
505 static void pci_device_shutdown(struct device *dev)
507 struct pci_dev *pci_dev = to_pci_dev(dev);
508 struct pci_driver *drv = pci_dev->driver;
510 pm_runtime_resume(dev);
512 if (drv && drv->shutdown)
513 drv->shutdown(pci_dev);
516 * If this is a kexec reboot, turn off Bus Master bit on the
517 * device to tell it to not continue to do DMA. Don't touch
518 * devices in D3cold or unknown states.
519 * If it is not a kexec reboot, firmware will hit the PCI
520 * devices with big hammer and stop their DMA any way.
522 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
523 pci_clear_master(pci_dev);
526 #ifdef CONFIG_PM_SLEEP
528 /* Auxiliary functions used for system resume */
531 * pci_restore_standard_config - restore standard config registers of PCI device
532 * @pci_dev: PCI device to handle
534 static int pci_restore_standard_config(struct pci_dev *pci_dev)
536 pci_update_current_state(pci_dev, PCI_UNKNOWN);
538 if (pci_dev->current_state != PCI_D0) {
539 int error = pci_set_power_state(pci_dev, PCI_D0);
544 pci_restore_state(pci_dev);
545 pci_pme_restore(pci_dev);
548 #endif /* CONFIG_PM_SLEEP */
552 /* Auxiliary functions used for system resume and run-time resume */
554 static void pci_pm_default_resume(struct pci_dev *pci_dev)
556 pci_fixup_device(pci_fixup_resume, pci_dev);
557 pci_enable_wake(pci_dev, PCI_D0, false);
560 static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev)
562 pci_power_up(pci_dev);
563 pci_update_current_state(pci_dev, PCI_D0);
566 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
568 pci_pm_power_up_and_verify_state(pci_dev);
569 pci_restore_state(pci_dev);
570 pci_pme_restore(pci_dev);
573 static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev)
575 pci_bridge_wait_for_secondary_bus(pci_dev);
577 * When powering on a bridge from D3cold, the whole hierarchy may be
578 * powered on into D0uninitialized state, resume them to give them a
579 * chance to suspend again
581 pci_resume_bus(pci_dev->subordinate);
584 #endif /* CONFIG_PM */
586 #ifdef CONFIG_PM_SLEEP
589 * Default "suspend" method for devices that have no driver provided suspend,
590 * or not even a driver at all (second part).
592 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
595 * mark its power state as "unknown", since we don't know if
596 * e.g. the BIOS will change its device state when we suspend.
598 if (pci_dev->current_state == PCI_D0)
599 pci_dev->current_state = PCI_UNKNOWN;
603 * Default "resume" method for devices that have no driver provided resume,
604 * or not even a driver at all (second part).
606 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
610 /* if the device was enabled before suspend, re-enable */
611 retval = pci_reenable_device(pci_dev);
613 * if the device was busmaster before the suspend, make it busmaster
616 if (pci_dev->is_busmaster)
617 pci_set_master(pci_dev);
622 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
624 struct pci_dev *pci_dev = to_pci_dev(dev);
625 struct pci_driver *drv = pci_dev->driver;
627 if (drv && drv->suspend) {
628 pci_power_t prev = pci_dev->current_state;
631 error = drv->suspend(pci_dev, state);
632 suspend_report_result(dev, drv->suspend, error);
636 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
637 && pci_dev->current_state != PCI_UNKNOWN) {
638 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
639 "PCI PM: Device state not saved by %pS\n",
644 pci_fixup_device(pci_fixup_suspend, pci_dev);
649 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
651 struct pci_dev *pci_dev = to_pci_dev(dev);
653 if (!pci_dev->state_saved)
654 pci_save_state(pci_dev);
656 pci_pm_set_unknown_state(pci_dev);
658 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
663 static int pci_legacy_resume(struct device *dev)
665 struct pci_dev *pci_dev = to_pci_dev(dev);
666 struct pci_driver *drv = pci_dev->driver;
668 pci_fixup_device(pci_fixup_resume, pci_dev);
670 return drv && drv->resume ?
671 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
674 /* Auxiliary functions used by the new power management framework */
676 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
678 /* Disable non-bridge devices without PM support */
679 if (!pci_has_subordinate(pci_dev))
680 pci_disable_enabled_device(pci_dev);
683 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
685 struct pci_driver *drv = pci_dev->driver;
686 bool ret = drv && (drv->suspend || drv->resume);
689 * Legacy PM support is used by default, so warn if the new framework is
690 * supported as well. Drivers are supposed to support either the
691 * former, or the latter, but not both at the same time.
693 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
694 pci_dev->vendor, pci_dev->device);
699 /* New power management framework */
701 static int pci_pm_prepare(struct device *dev)
703 struct pci_dev *pci_dev = to_pci_dev(dev);
704 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
706 if (pm && pm->prepare) {
707 int error = pm->prepare(dev);
711 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
714 if (pci_dev_need_resume(pci_dev))
718 * The PME setting needs to be adjusted here in case the direct-complete
719 * optimization is used with respect to this device.
721 pci_dev_adjust_pme(pci_dev);
725 static void pci_pm_complete(struct device *dev)
727 struct pci_dev *pci_dev = to_pci_dev(dev);
729 pci_dev_complete_resume(pci_dev);
730 pm_generic_complete(dev);
732 /* Resume device if platform firmware has put it in reset-power-on */
733 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
734 pci_power_t pre_sleep_state = pci_dev->current_state;
736 pci_refresh_power_state(pci_dev);
738 * On platforms with ACPI this check may also trigger for
739 * devices sharing power resources if one of those power
740 * resources has been activated as a result of a change of the
741 * power state of another device sharing it. However, in that
742 * case it is also better to resume the device, in general.
744 if (pci_dev->current_state < pre_sleep_state)
745 pm_request_resume(dev);
749 #else /* !CONFIG_PM_SLEEP */
751 #define pci_pm_prepare NULL
752 #define pci_pm_complete NULL
754 #endif /* !CONFIG_PM_SLEEP */
756 #ifdef CONFIG_SUSPEND
757 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
760 * Some BIOSes forget to clear Root PME Status bits after system
761 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
762 * Clear those bits now just in case (shouldn't hurt).
764 if (pci_is_pcie(pci_dev) &&
765 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
766 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
767 pcie_clear_root_pme_status(pci_dev);
770 static int pci_pm_suspend(struct device *dev)
772 struct pci_dev *pci_dev = to_pci_dev(dev);
773 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
775 pci_dev->skip_bus_pm = false;
777 if (pci_has_legacy_pm_support(pci_dev))
778 return pci_legacy_suspend(dev, PMSG_SUSPEND);
781 pci_pm_default_suspend(pci_dev);
786 * PCI devices suspended at run time may need to be resumed at this
787 * point, because in general it may be necessary to reconfigure them for
788 * system suspend. Namely, if the device is expected to wake up the
789 * system from the sleep state, it may have to be reconfigured for this
790 * purpose, or if the device is not expected to wake up the system from
791 * the sleep state, it should be prevented from signaling wakeup events
794 * Also if the driver of the device does not indicate that its system
795 * suspend callbacks can cope with runtime-suspended devices, it is
796 * better to resume the device from runtime suspend here.
798 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
799 pci_dev_need_resume(pci_dev)) {
800 pm_runtime_resume(dev);
801 pci_dev->state_saved = false;
803 pci_dev_adjust_pme(pci_dev);
807 pci_power_t prev = pci_dev->current_state;
810 error = pm->suspend(dev);
811 suspend_report_result(dev, pm->suspend, error);
815 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
816 && pci_dev->current_state != PCI_UNKNOWN) {
817 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
818 "PCI PM: State of device not saved by %pS\n",
826 static int pci_pm_suspend_late(struct device *dev)
828 if (dev_pm_skip_suspend(dev))
831 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
833 return pm_generic_suspend_late(dev);
836 static int pci_pm_suspend_noirq(struct device *dev)
838 struct pci_dev *pci_dev = to_pci_dev(dev);
839 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
841 if (dev_pm_skip_suspend(dev))
844 if (pci_has_legacy_pm_support(pci_dev))
845 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
848 pci_save_state(pci_dev);
852 if (pm->suspend_noirq) {
853 pci_power_t prev = pci_dev->current_state;
856 error = pm->suspend_noirq(dev);
857 suspend_report_result(dev, pm->suspend_noirq, error);
861 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
862 && pci_dev->current_state != PCI_UNKNOWN) {
863 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
864 "PCI PM: State of device not saved by %pS\n",
870 if (pci_dev->skip_bus_pm) {
872 * Either the device is a bridge with a child in D0 below it, or
873 * the function is running for the second time in a row without
874 * going through full resume, which is possible only during
875 * suspend-to-idle in a spurious wakeup case. The device should
876 * be in D0 at this point, but if it is a bridge, it may be
877 * necessary to save its state.
879 if (!pci_dev->state_saved)
880 pci_save_state(pci_dev);
881 } else if (!pci_dev->state_saved) {
882 pci_save_state(pci_dev);
883 if (pci_power_manageable(pci_dev))
884 pci_prepare_to_sleep(pci_dev);
887 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
888 pci_power_name(pci_dev->current_state));
890 if (pci_dev->current_state == PCI_D0) {
891 pci_dev->skip_bus_pm = true;
893 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
894 * downstream device is in D0, so avoid changing the power state
895 * of the parent bridge by setting the skip_bus_pm flag for it.
897 if (pci_dev->bus->self)
898 pci_dev->bus->self->skip_bus_pm = true;
901 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
902 pci_dbg(pci_dev, "PCI PM: Skipped\n");
906 pci_pm_set_unknown_state(pci_dev);
909 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
910 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
911 * hasn't been quiesced and tries to turn it off. If the controller
912 * is already in D3, this can hang or cause memory corruption.
914 * Since the value of the COMMAND register doesn't matter once the
915 * device has been suspended, we can safely set it to 0 here.
917 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
918 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
921 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
924 * If the target system sleep state is suspend-to-idle, it is sufficient
925 * to check whether or not the device's wakeup settings are good for
926 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
927 * pci_pm_complete() to take care of fixing up the device's state
928 * anyway, if need be.
930 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
931 dev->power.may_skip_resume = false;
936 static int pci_pm_resume_noirq(struct device *dev)
938 struct pci_dev *pci_dev = to_pci_dev(dev);
939 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
940 pci_power_t prev_state = pci_dev->current_state;
941 bool skip_bus_pm = pci_dev->skip_bus_pm;
943 if (dev_pm_skip_resume(dev))
947 * In the suspend-to-idle case, devices left in D0 during suspend will
948 * stay in D0, so it is not necessary to restore or update their
949 * configuration here and attempting to put them into D0 again is
950 * pointless, so avoid doing that.
952 if (!(skip_bus_pm && pm_suspend_no_platform()))
953 pci_pm_default_resume_early(pci_dev);
955 pci_fixup_device(pci_fixup_resume_early, pci_dev);
956 pcie_pme_root_status_cleanup(pci_dev);
958 if (!skip_bus_pm && prev_state == PCI_D3cold)
959 pci_pm_bridge_power_up_actions(pci_dev);
961 if (pci_has_legacy_pm_support(pci_dev))
964 if (pm && pm->resume_noirq)
965 return pm->resume_noirq(dev);
970 static int pci_pm_resume_early(struct device *dev)
972 if (dev_pm_skip_resume(dev))
975 return pm_generic_resume_early(dev);
978 static int pci_pm_resume(struct device *dev)
980 struct pci_dev *pci_dev = to_pci_dev(dev);
981 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
984 * This is necessary for the suspend error path in which resume is
985 * called without restoring the standard config registers of the device.
987 if (pci_dev->state_saved)
988 pci_restore_standard_config(pci_dev);
990 if (pci_has_legacy_pm_support(pci_dev))
991 return pci_legacy_resume(dev);
993 pci_pm_default_resume(pci_dev);
997 return pm->resume(dev);
999 pci_pm_reenable_device(pci_dev);
1005 #else /* !CONFIG_SUSPEND */
1007 #define pci_pm_suspend NULL
1008 #define pci_pm_suspend_late NULL
1009 #define pci_pm_suspend_noirq NULL
1010 #define pci_pm_resume NULL
1011 #define pci_pm_resume_early NULL
1012 #define pci_pm_resume_noirq NULL
1014 #endif /* !CONFIG_SUSPEND */
1016 #ifdef CONFIG_HIBERNATE_CALLBACKS
1018 static int pci_pm_freeze(struct device *dev)
1020 struct pci_dev *pci_dev = to_pci_dev(dev);
1021 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1023 if (pci_has_legacy_pm_support(pci_dev))
1024 return pci_legacy_suspend(dev, PMSG_FREEZE);
1027 pci_pm_default_suspend(pci_dev);
1032 * Resume all runtime-suspended devices before creating a snapshot
1033 * image of system memory, because the restore kernel generally cannot
1034 * be expected to always handle them consistently and they need to be
1035 * put into the runtime-active metastate during system resume anyway,
1036 * so it is better to ensure that the state saved in the image will be
1037 * always consistent with that.
1039 pm_runtime_resume(dev);
1040 pci_dev->state_saved = false;
1045 error = pm->freeze(dev);
1046 suspend_report_result(dev, pm->freeze, error);
1054 static int pci_pm_freeze_noirq(struct device *dev)
1056 struct pci_dev *pci_dev = to_pci_dev(dev);
1057 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1059 if (pci_has_legacy_pm_support(pci_dev))
1060 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1062 if (pm && pm->freeze_noirq) {
1065 error = pm->freeze_noirq(dev);
1066 suspend_report_result(dev, pm->freeze_noirq, error);
1071 if (!pci_dev->state_saved)
1072 pci_save_state(pci_dev);
1074 pci_pm_set_unknown_state(pci_dev);
1079 static int pci_pm_thaw_noirq(struct device *dev)
1081 struct pci_dev *pci_dev = to_pci_dev(dev);
1082 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1085 * The pm->thaw_noirq() callback assumes the device has been
1086 * returned to D0 and its config state has been restored.
1088 * In addition, pci_restore_state() restores MSI-X state in MMIO
1089 * space, which requires the device to be in D0, so return it to D0
1090 * in case the driver's "freeze" callbacks put it into a low-power
1093 pci_pm_power_up_and_verify_state(pci_dev);
1094 pci_restore_state(pci_dev);
1096 if (pci_has_legacy_pm_support(pci_dev))
1099 if (pm && pm->thaw_noirq)
1100 return pm->thaw_noirq(dev);
1105 static int pci_pm_thaw(struct device *dev)
1107 struct pci_dev *pci_dev = to_pci_dev(dev);
1108 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1111 if (pci_has_legacy_pm_support(pci_dev))
1112 return pci_legacy_resume(dev);
1116 error = pm->thaw(dev);
1118 pci_pm_reenable_device(pci_dev);
1121 pci_dev->state_saved = false;
1126 static int pci_pm_poweroff(struct device *dev)
1128 struct pci_dev *pci_dev = to_pci_dev(dev);
1129 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1131 if (pci_has_legacy_pm_support(pci_dev))
1132 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1135 pci_pm_default_suspend(pci_dev);
1139 /* The reason to do that is the same as in pci_pm_suspend(). */
1140 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1141 pci_dev_need_resume(pci_dev)) {
1142 pm_runtime_resume(dev);
1143 pci_dev->state_saved = false;
1145 pci_dev_adjust_pme(pci_dev);
1151 error = pm->poweroff(dev);
1152 suspend_report_result(dev, pm->poweroff, error);
1160 static int pci_pm_poweroff_late(struct device *dev)
1162 if (dev_pm_skip_suspend(dev))
1165 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1167 return pm_generic_poweroff_late(dev);
1170 static int pci_pm_poweroff_noirq(struct device *dev)
1172 struct pci_dev *pci_dev = to_pci_dev(dev);
1173 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1175 if (dev_pm_skip_suspend(dev))
1178 if (pci_has_legacy_pm_support(pci_dev))
1179 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1182 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1186 if (pm->poweroff_noirq) {
1189 error = pm->poweroff_noirq(dev);
1190 suspend_report_result(dev, pm->poweroff_noirq, error);
1195 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1196 pci_prepare_to_sleep(pci_dev);
1199 * The reason for doing this here is the same as for the analogous code
1200 * in pci_pm_suspend_noirq().
1202 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1203 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1205 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1210 static int pci_pm_restore_noirq(struct device *dev)
1212 struct pci_dev *pci_dev = to_pci_dev(dev);
1213 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1215 pci_pm_default_resume_early(pci_dev);
1216 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1218 if (pci_has_legacy_pm_support(pci_dev))
1221 if (pm && pm->restore_noirq)
1222 return pm->restore_noirq(dev);
1227 static int pci_pm_restore(struct device *dev)
1229 struct pci_dev *pci_dev = to_pci_dev(dev);
1230 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1233 * This is necessary for the hibernation error path in which restore is
1234 * called without restoring the standard config registers of the device.
1236 if (pci_dev->state_saved)
1237 pci_restore_standard_config(pci_dev);
1239 if (pci_has_legacy_pm_support(pci_dev))
1240 return pci_legacy_resume(dev);
1242 pci_pm_default_resume(pci_dev);
1246 return pm->restore(dev);
1248 pci_pm_reenable_device(pci_dev);
1254 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1256 #define pci_pm_freeze NULL
1257 #define pci_pm_freeze_noirq NULL
1258 #define pci_pm_thaw NULL
1259 #define pci_pm_thaw_noirq NULL
1260 #define pci_pm_poweroff NULL
1261 #define pci_pm_poweroff_late NULL
1262 #define pci_pm_poweroff_noirq NULL
1263 #define pci_pm_restore NULL
1264 #define pci_pm_restore_noirq NULL
1266 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1270 static int pci_pm_runtime_suspend(struct device *dev)
1272 struct pci_dev *pci_dev = to_pci_dev(dev);
1273 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1274 pci_power_t prev = pci_dev->current_state;
1278 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1279 * but it may go to D3cold when the bridge above it runtime suspends.
1280 * Save its config space in case that happens.
1282 if (!pci_dev->driver) {
1283 pci_save_state(pci_dev);
1287 pci_dev->state_saved = false;
1288 if (pm && pm->runtime_suspend) {
1289 error = pm->runtime_suspend(dev);
1291 * -EBUSY and -EAGAIN is used to request the runtime PM core
1292 * to schedule a new suspend, so log the event only with debug
1295 if (error == -EBUSY || error == -EAGAIN) {
1296 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1297 pm->runtime_suspend, error);
1300 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1301 pm->runtime_suspend, error);
1306 pci_fixup_device(pci_fixup_suspend, pci_dev);
1308 if (pm && pm->runtime_suspend
1309 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1310 && pci_dev->current_state != PCI_UNKNOWN) {
1311 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1312 "PCI PM: State of device not saved by %pS\n",
1313 pm->runtime_suspend);
1317 if (!pci_dev->state_saved) {
1318 pci_save_state(pci_dev);
1319 pci_finish_runtime_suspend(pci_dev);
1325 static int pci_pm_runtime_resume(struct device *dev)
1327 struct pci_dev *pci_dev = to_pci_dev(dev);
1328 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1329 pci_power_t prev_state = pci_dev->current_state;
1333 * Restoring config space is necessary even if the device is not bound
1334 * to a driver because although we left it in D0, it may have gone to
1335 * D3cold when the bridge above it runtime suspended.
1337 pci_pm_default_resume_early(pci_dev);
1339 if (!pci_dev->driver)
1342 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1343 pci_pm_default_resume(pci_dev);
1345 if (prev_state == PCI_D3cold)
1346 pci_pm_bridge_power_up_actions(pci_dev);
1348 if (pm && pm->runtime_resume)
1349 error = pm->runtime_resume(dev);
1354 static int pci_pm_runtime_idle(struct device *dev)
1356 struct pci_dev *pci_dev = to_pci_dev(dev);
1357 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1360 * If pci_dev->driver is not set (unbound), the device should
1361 * always remain in D0 regardless of the runtime PM status
1363 if (!pci_dev->driver)
1369 if (pm->runtime_idle)
1370 return pm->runtime_idle(dev);
1375 static const struct dev_pm_ops pci_dev_pm_ops = {
1376 .prepare = pci_pm_prepare,
1377 .complete = pci_pm_complete,
1378 .suspend = pci_pm_suspend,
1379 .suspend_late = pci_pm_suspend_late,
1380 .resume = pci_pm_resume,
1381 .resume_early = pci_pm_resume_early,
1382 .freeze = pci_pm_freeze,
1383 .thaw = pci_pm_thaw,
1384 .poweroff = pci_pm_poweroff,
1385 .poweroff_late = pci_pm_poweroff_late,
1386 .restore = pci_pm_restore,
1387 .suspend_noirq = pci_pm_suspend_noirq,
1388 .resume_noirq = pci_pm_resume_noirq,
1389 .freeze_noirq = pci_pm_freeze_noirq,
1390 .thaw_noirq = pci_pm_thaw_noirq,
1391 .poweroff_noirq = pci_pm_poweroff_noirq,
1392 .restore_noirq = pci_pm_restore_noirq,
1393 .runtime_suspend = pci_pm_runtime_suspend,
1394 .runtime_resume = pci_pm_runtime_resume,
1395 .runtime_idle = pci_pm_runtime_idle,
1398 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1400 #else /* !CONFIG_PM */
1402 #define pci_pm_runtime_suspend NULL
1403 #define pci_pm_runtime_resume NULL
1404 #define pci_pm_runtime_idle NULL
1406 #define PCI_PM_OPS_PTR NULL
1408 #endif /* !CONFIG_PM */
1411 * __pci_register_driver - register a new pci driver
1412 * @drv: the driver structure to register
1413 * @owner: owner module of drv
1414 * @mod_name: module name string
1416 * Adds the driver structure to the list of registered drivers.
1417 * Returns a negative value on error, otherwise 0.
1418 * If no error occurred, the driver remains registered even if
1419 * no device was claimed during registration.
1421 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1422 const char *mod_name)
1424 /* initialize common driver fields */
1425 drv->driver.name = drv->name;
1426 drv->driver.bus = &pci_bus_type;
1427 drv->driver.owner = owner;
1428 drv->driver.mod_name = mod_name;
1429 drv->driver.groups = drv->groups;
1430 drv->driver.dev_groups = drv->dev_groups;
1432 spin_lock_init(&drv->dynids.lock);
1433 INIT_LIST_HEAD(&drv->dynids.list);
1435 /* register with core */
1436 return driver_register(&drv->driver);
1438 EXPORT_SYMBOL(__pci_register_driver);
1441 * pci_unregister_driver - unregister a pci driver
1442 * @drv: the driver structure to unregister
1444 * Deletes the driver structure from the list of registered PCI drivers,
1445 * gives it a chance to clean up by calling its remove() function for
1446 * each device it was responsible for, and marks those devices as
1450 void pci_unregister_driver(struct pci_driver *drv)
1452 driver_unregister(&drv->driver);
1453 pci_free_dynids(drv);
1455 EXPORT_SYMBOL(pci_unregister_driver);
1457 static struct pci_driver pci_compat_driver = {
1462 * pci_dev_driver - get the pci_driver of a device
1463 * @dev: the device to query
1465 * Returns the appropriate pci_driver structure or %NULL if there is no
1466 * registered driver for the device.
1468 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1474 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1475 if (dev->resource[i].flags & IORESOURCE_BUSY)
1476 return &pci_compat_driver;
1480 EXPORT_SYMBOL(pci_dev_driver);
1483 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1484 * @dev: the PCI device structure to match against
1485 * @drv: the device driver to search for matching PCI device id structures
1487 * Used by a driver to check whether a PCI device present in the
1488 * system is in its list of supported devices. Returns the matching
1489 * pci_device_id structure or %NULL if there is no match.
1491 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1493 struct pci_dev *pci_dev = to_pci_dev(dev);
1494 struct pci_driver *pci_drv;
1495 const struct pci_device_id *found_id;
1497 if (!pci_dev->match_driver)
1500 pci_drv = to_pci_driver(drv);
1501 found_id = pci_match_device(pci_drv, pci_dev);
1509 * pci_dev_get - increments the reference count of the pci device structure
1510 * @dev: the device being referenced
1512 * Each live reference to a device should be refcounted.
1514 * Drivers for PCI devices should normally record such references in
1515 * their probe() methods, when they bind to a device, and release
1516 * them by calling pci_dev_put(), in their disconnect() methods.
1518 * A pointer to the device with the incremented reference counter is returned.
1520 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1523 get_device(&dev->dev);
1526 EXPORT_SYMBOL(pci_dev_get);
1529 * pci_dev_put - release a use of the pci device structure
1530 * @dev: device that's been disconnected
1532 * Must be called when a user of a device is finished with it. When the last
1533 * user of the device calls this function, the memory of the device is freed.
1535 void pci_dev_put(struct pci_dev *dev)
1538 put_device(&dev->dev);
1540 EXPORT_SYMBOL(pci_dev_put);
1542 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1544 struct pci_dev *pdev;
1549 pdev = to_pci_dev(dev);
1551 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1554 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1557 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1558 pdev->subsystem_device))
1561 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1564 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1565 pdev->vendor, pdev->device,
1566 pdev->subsystem_vendor, pdev->subsystem_device,
1567 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1574 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1576 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1577 * @pdev: PCI device undergoing error recovery
1578 * @err_type: type of error event
1580 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1586 case PCI_ERS_RESULT_NONE:
1587 case PCI_ERS_RESULT_CAN_RECOVER:
1588 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1589 envp[idx++] = "DEVICE_ONLINE=0";
1591 case PCI_ERS_RESULT_RECOVERED:
1592 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1593 envp[idx++] = "DEVICE_ONLINE=1";
1595 case PCI_ERS_RESULT_DISCONNECT:
1596 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1597 envp[idx++] = "DEVICE_ONLINE=0";
1605 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1610 static int pci_bus_num_vf(struct device *dev)
1612 return pci_num_vf(to_pci_dev(dev));
1616 * pci_dma_configure - Setup DMA configuration
1617 * @dev: ptr to dev structure
1619 * Function to update PCI devices's DMA configuration using the same
1620 * info from the OF node or ACPI node of host bridge's parent (if any).
1622 static int pci_dma_configure(struct device *dev)
1624 struct pci_driver *driver = to_pci_driver(dev->driver);
1625 struct device *bridge;
1628 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1630 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1631 bridge->parent->of_node) {
1632 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1633 } else if (has_acpi_companion(bridge)) {
1634 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1636 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1639 pci_put_host_bridge_device(bridge);
1641 if (!ret && !driver->driver_managed_dma) {
1642 ret = iommu_device_use_default_domain(dev);
1644 arch_teardown_dma_ops(dev);
1650 static void pci_dma_cleanup(struct device *dev)
1652 struct pci_driver *driver = to_pci_driver(dev->driver);
1654 if (!driver->driver_managed_dma)
1655 iommu_device_unuse_default_domain(dev);
1658 struct bus_type pci_bus_type = {
1660 .match = pci_bus_match,
1661 .uevent = pci_uevent,
1662 .probe = pci_device_probe,
1663 .remove = pci_device_remove,
1664 .shutdown = pci_device_shutdown,
1665 .dev_groups = pci_dev_groups,
1666 .bus_groups = pci_bus_groups,
1667 .drv_groups = pci_drv_groups,
1668 .pm = PCI_PM_OPS_PTR,
1669 .num_vf = pci_bus_num_vf,
1670 .dma_configure = pci_dma_configure,
1671 .dma_cleanup = pci_dma_cleanup,
1673 EXPORT_SYMBOL(pci_bus_type);
1675 #ifdef CONFIG_PCIEPORTBUS
1676 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1678 struct pcie_device *pciedev;
1679 struct pcie_port_service_driver *driver;
1681 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1684 pciedev = to_pcie_device(dev);
1685 driver = to_service_driver(drv);
1687 if (driver->service != pciedev->service)
1690 if (driver->port_type != PCIE_ANY_PORT &&
1691 driver->port_type != pci_pcie_type(pciedev->port))
1697 struct bus_type pcie_port_bus_type = {
1698 .name = "pci_express",
1699 .match = pcie_port_bus_match,
1701 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1704 static int __init pci_driver_init(void)
1708 ret = bus_register(&pci_bus_type);
1712 #ifdef CONFIG_PCIEPORTBUS
1713 ret = bus_register(&pcie_port_bus_type);
1717 dma_debug_add_bus(&pci_bus_type);
1720 postcore_initcall(pci_driver_init);