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>
24 #include "pcie/portdrv.h"
27 struct list_head node;
28 struct pci_device_id id;
32 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
33 * @drv: target pci driver
34 * @vendor: PCI vendor ID
35 * @device: PCI device ID
36 * @subvendor: PCI subvendor ID
37 * @subdevice: PCI subdevice ID
39 * @class_mask: PCI class mask
40 * @driver_data: private driver data
42 * Adds a new dynamic pci device ID to this driver and causes the
43 * driver to probe for all devices again. @drv must have been
44 * registered prior to calling this function.
47 * Does GFP_KERNEL allocation.
50 * 0 on success, -errno on failure.
52 int pci_add_dynid(struct pci_driver *drv,
53 unsigned int vendor, unsigned int device,
54 unsigned int subvendor, unsigned int subdevice,
55 unsigned int class, unsigned int class_mask,
56 unsigned long driver_data)
58 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 return driver_attach(&drv->driver);
78 EXPORT_SYMBOL_GPL(pci_add_dynid);
80 static void pci_free_dynids(struct pci_driver *drv)
82 struct pci_dynid *dynid, *n;
84 spin_lock(&drv->dynids.lock);
85 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
86 list_del(&dynid->node);
89 spin_unlock(&drv->dynids.lock);
93 * pci_match_id - See if a PCI device matches a given pci_id table
94 * @ids: array of PCI device ID structures to search in
95 * @dev: the PCI device structure to match against.
97 * Used by a driver to check whether a PCI device is in its list of
98 * supported devices. Returns the matching pci_device_id structure or
99 * %NULL if there is no match.
101 * Deprecated; don't use this as it will not catch any dynamic IDs
102 * that a driver might want to check for.
104 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
108 while (ids->vendor || ids->subvendor || ids->class_mask) {
109 if (pci_match_one_device(ids, dev))
116 EXPORT_SYMBOL(pci_match_id);
118 static const struct pci_device_id pci_device_id_any = {
119 .vendor = PCI_ANY_ID,
120 .device = PCI_ANY_ID,
121 .subvendor = PCI_ANY_ID,
122 .subdevice = PCI_ANY_ID,
126 * pci_match_device - See if a device matches a driver's list of IDs
127 * @drv: the PCI driver to match against
128 * @dev: the PCI device structure to match against
130 * Used by a driver to check whether a PCI device is in its list of
131 * supported devices or in the dynids list, which may have been augmented
132 * via the sysfs "new_id" file. Returns the matching pci_device_id
133 * structure or %NULL if there is no match.
135 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
138 struct pci_dynid *dynid;
139 const struct pci_device_id *found_id = NULL, *ids;
141 /* When driver_override is set, only bind to the matching driver */
142 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
145 /* Look at the dynamic ids first, before the static ones */
146 spin_lock(&drv->dynids.lock);
147 list_for_each_entry(dynid, &drv->dynids.list, node) {
148 if (pci_match_one_device(&dynid->id, dev)) {
149 found_id = &dynid->id;
153 spin_unlock(&drv->dynids.lock);
158 for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
159 ids = found_id + 1) {
161 * The match table is split based on driver_override.
162 * In case override_only was set, enforce driver_override
165 if (found_id->override_only) {
166 if (dev->driver_override)
173 /* driver_override will always match, send a dummy id */
174 if (dev->driver_override)
175 return &pci_device_id_any;
180 * new_id_store - sysfs frontend to pci_add_dynid()
181 * @driver: target device driver
182 * @buf: buffer for scanning device ID data
185 * Allow PCI IDs to be added to an existing driver via sysfs.
187 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
190 struct pci_driver *pdrv = to_pci_driver(driver);
191 const struct pci_device_id *ids = pdrv->id_table;
192 u32 vendor, device, subvendor = PCI_ANY_ID,
193 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
194 unsigned long driver_data = 0;
198 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
199 &vendor, &device, &subvendor, &subdevice,
200 &class, &class_mask, &driver_data);
205 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
209 pdev->vendor = vendor;
210 pdev->device = device;
211 pdev->subsystem_vendor = subvendor;
212 pdev->subsystem_device = subdevice;
215 if (pci_match_device(pdrv, pdev))
224 /* Only accept driver_data values that match an existing id_table
228 while (ids->vendor || ids->subvendor || ids->class_mask) {
229 if (driver_data == ids->driver_data) {
235 if (retval) /* No match */
239 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
240 class, class_mask, driver_data);
245 static DRIVER_ATTR_WO(new_id);
248 * remove_id_store - remove a PCI device ID from this driver
249 * @driver: target device driver
250 * @buf: buffer for scanning device ID data
253 * Removes a dynamic pci device ID to this driver.
255 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
258 struct pci_dynid *dynid, *n;
259 struct pci_driver *pdrv = to_pci_driver(driver);
260 u32 vendor, device, subvendor = PCI_ANY_ID,
261 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
263 size_t retval = -ENODEV;
265 fields = sscanf(buf, "%x %x %x %x %x %x",
266 &vendor, &device, &subvendor, &subdevice,
267 &class, &class_mask);
271 spin_lock(&pdrv->dynids.lock);
272 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
273 struct pci_device_id *id = &dynid->id;
274 if ((id->vendor == vendor) &&
275 (id->device == device) &&
276 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
277 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
278 !((id->class ^ class) & class_mask)) {
279 list_del(&dynid->node);
285 spin_unlock(&pdrv->dynids.lock);
289 static DRIVER_ATTR_WO(remove_id);
291 static struct attribute *pci_drv_attrs[] = {
292 &driver_attr_new_id.attr,
293 &driver_attr_remove_id.attr,
296 ATTRIBUTE_GROUPS(pci_drv);
298 struct drv_dev_and_id {
299 struct pci_driver *drv;
301 const struct pci_device_id *id;
304 static long local_pci_probe(void *_ddi)
306 struct drv_dev_and_id *ddi = _ddi;
307 struct pci_dev *pci_dev = ddi->dev;
308 struct pci_driver *pci_drv = ddi->drv;
309 struct device *dev = &pci_dev->dev;
313 * Unbound PCI devices are always put in D0, regardless of
314 * runtime PM status. During probe, the device is set to
315 * active and the usage count is incremented. If the driver
316 * supports runtime PM, it should call pm_runtime_put_noidle(),
317 * or any other runtime PM helper function decrementing the usage
318 * count, in its probe routine and pm_runtime_get_noresume() in
319 * its remove routine.
321 pm_runtime_get_sync(dev);
322 pci_dev->driver = pci_drv;
323 rc = pci_drv->probe(pci_dev, ddi->id);
327 pci_dev->driver = NULL;
328 pm_runtime_put_sync(dev);
332 * Probe function should return < 0 for failure, 0 for success
333 * Treat values > 0 as success, but warn.
335 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
340 static bool pci_physfn_is_probed(struct pci_dev *dev)
342 #ifdef CONFIG_PCI_IOV
343 return dev->is_virtfn && dev->physfn->is_probed;
349 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
350 const struct pci_device_id *id)
352 int error, node, cpu;
353 int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
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 cpu = cpumask_any_and(cpumask_of_node(node),
375 housekeeping_cpumask(hk_flags));
377 if (cpu < nr_cpu_ids)
378 error = work_on_cpu(cpu, local_pci_probe, &ddi);
380 error = local_pci_probe(&ddi);
383 cpu_hotplug_enable();
388 * __pci_device_probe - check if a driver wants to claim a specific PCI device
389 * @drv: driver to call to check if it wants the PCI device
390 * @pci_dev: PCI device being probed
392 * returns 0 on success, else error.
393 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
395 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
397 const struct pci_device_id *id;
403 id = pci_match_device(drv, pci_dev);
405 error = pci_call_probe(drv, pci_dev, id);
410 int __weak pcibios_alloc_irq(struct pci_dev *dev)
415 void __weak pcibios_free_irq(struct pci_dev *dev)
419 #ifdef CONFIG_PCI_IOV
420 static inline bool pci_device_can_probe(struct pci_dev *pdev)
422 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
423 pdev->driver_override);
426 static inline bool pci_device_can_probe(struct pci_dev *pdev)
432 static int pci_device_probe(struct device *dev)
435 struct pci_dev *pci_dev = to_pci_dev(dev);
436 struct pci_driver *drv = to_pci_driver(dev->driver);
438 if (!pci_device_can_probe(pci_dev))
441 pci_assign_irq(pci_dev);
443 error = pcibios_alloc_irq(pci_dev);
447 pci_dev_get(pci_dev);
448 error = __pci_device_probe(drv, pci_dev);
450 pcibios_free_irq(pci_dev);
451 pci_dev_put(pci_dev);
457 static void pci_device_remove(struct device *dev)
459 struct pci_dev *pci_dev = to_pci_dev(dev);
460 struct pci_driver *drv = pci_dev->driver;
463 pm_runtime_get_sync(dev);
464 drv->remove(pci_dev);
465 pm_runtime_put_noidle(dev);
467 pcibios_free_irq(pci_dev);
468 pci_dev->driver = NULL;
469 pci_iov_remove(pci_dev);
471 /* Undo the runtime PM settings in local_pci_probe() */
472 pm_runtime_put_sync(dev);
475 * If the device is still on, set the power state as "unknown",
476 * since it might change by the next time we load the driver.
478 if (pci_dev->current_state == PCI_D0)
479 pci_dev->current_state = PCI_UNKNOWN;
482 * We would love to complain here if pci_dev->is_enabled is set, that
483 * the driver should have called pci_disable_device(), but the
484 * unfortunate fact is there are too many odd BIOS and bridge setups
485 * that don't like drivers doing that all of the time.
486 * Oh well, we can dream of sane hardware when we sleep, no matter how
487 * horrible the crap we have to deal with is when we are awake...
490 pci_dev_put(pci_dev);
493 static void pci_device_shutdown(struct device *dev)
495 struct pci_dev *pci_dev = to_pci_dev(dev);
496 struct pci_driver *drv = pci_dev->driver;
498 pm_runtime_resume(dev);
500 if (drv && drv->shutdown)
501 drv->shutdown(pci_dev);
504 * If this is a kexec reboot, turn off Bus Master bit on the
505 * device to tell it to not continue to do DMA. Don't touch
506 * devices in D3cold or unknown states.
507 * If it is not a kexec reboot, firmware will hit the PCI
508 * devices with big hammer and stop their DMA any way.
510 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
511 pci_clear_master(pci_dev);
516 /* Auxiliary functions used for system resume and run-time resume. */
519 * pci_restore_standard_config - restore standard config registers of PCI device
520 * @pci_dev: PCI device to handle
522 static int pci_restore_standard_config(struct pci_dev *pci_dev)
524 pci_update_current_state(pci_dev, PCI_UNKNOWN);
526 if (pci_dev->current_state != PCI_D0) {
527 int error = pci_set_power_state(pci_dev, PCI_D0);
532 pci_restore_state(pci_dev);
533 pci_pme_restore(pci_dev);
537 static void pci_pm_default_resume(struct pci_dev *pci_dev)
539 pci_fixup_device(pci_fixup_resume, pci_dev);
540 pci_enable_wake(pci_dev, PCI_D0, false);
545 #ifdef CONFIG_PM_SLEEP
547 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
549 pci_power_up(pci_dev);
550 pci_update_current_state(pci_dev, PCI_D0);
551 pci_restore_state(pci_dev);
552 pci_pme_restore(pci_dev);
556 * Default "suspend" method for devices that have no driver provided suspend,
557 * or not even a driver at all (second part).
559 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
562 * mark its power state as "unknown", since we don't know if
563 * e.g. the BIOS will change its device state when we suspend.
565 if (pci_dev->current_state == PCI_D0)
566 pci_dev->current_state = PCI_UNKNOWN;
570 * Default "resume" method for devices that have no driver provided resume,
571 * or not even a driver at all (second part).
573 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
577 /* if the device was enabled before suspend, re-enable */
578 retval = pci_reenable_device(pci_dev);
580 * if the device was busmaster before the suspend, make it busmaster
583 if (pci_dev->is_busmaster)
584 pci_set_master(pci_dev);
589 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
591 struct pci_dev *pci_dev = to_pci_dev(dev);
592 struct pci_driver *drv = pci_dev->driver;
594 if (drv && drv->suspend) {
595 pci_power_t prev = pci_dev->current_state;
598 error = drv->suspend(pci_dev, state);
599 suspend_report_result(drv->suspend, error);
603 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
604 && pci_dev->current_state != PCI_UNKNOWN) {
605 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
606 "PCI PM: Device state not saved by %pS\n",
611 pci_fixup_device(pci_fixup_suspend, pci_dev);
616 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
618 struct pci_dev *pci_dev = to_pci_dev(dev);
620 if (!pci_dev->state_saved)
621 pci_save_state(pci_dev);
623 pci_pm_set_unknown_state(pci_dev);
625 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
630 static int pci_legacy_resume(struct device *dev)
632 struct pci_dev *pci_dev = to_pci_dev(dev);
633 struct pci_driver *drv = pci_dev->driver;
635 pci_fixup_device(pci_fixup_resume, pci_dev);
637 return drv && drv->resume ?
638 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
641 /* Auxiliary functions used by the new power management framework */
643 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
645 /* Disable non-bridge devices without PM support */
646 if (!pci_has_subordinate(pci_dev))
647 pci_disable_enabled_device(pci_dev);
650 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
652 struct pci_driver *drv = pci_dev->driver;
653 bool ret = drv && (drv->suspend || drv->resume);
656 * Legacy PM support is used by default, so warn if the new framework is
657 * supported as well. Drivers are supposed to support either the
658 * former, or the latter, but not both at the same time.
660 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
661 pci_dev->vendor, pci_dev->device);
666 /* New power management framework */
668 static int pci_pm_prepare(struct device *dev)
670 struct pci_dev *pci_dev = to_pci_dev(dev);
671 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
673 if (pm && pm->prepare) {
674 int error = pm->prepare(dev);
678 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
681 if (pci_dev_need_resume(pci_dev))
685 * The PME setting needs to be adjusted here in case the direct-complete
686 * optimization is used with respect to this device.
688 pci_dev_adjust_pme(pci_dev);
692 static void pci_pm_complete(struct device *dev)
694 struct pci_dev *pci_dev = to_pci_dev(dev);
696 pci_dev_complete_resume(pci_dev);
697 pm_generic_complete(dev);
699 /* Resume device if platform firmware has put it in reset-power-on */
700 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
701 pci_power_t pre_sleep_state = pci_dev->current_state;
703 pci_refresh_power_state(pci_dev);
705 * On platforms with ACPI this check may also trigger for
706 * devices sharing power resources if one of those power
707 * resources has been activated as a result of a change of the
708 * power state of another device sharing it. However, in that
709 * case it is also better to resume the device, in general.
711 if (pci_dev->current_state < pre_sleep_state)
712 pm_request_resume(dev);
716 #else /* !CONFIG_PM_SLEEP */
718 #define pci_pm_prepare NULL
719 #define pci_pm_complete NULL
721 #endif /* !CONFIG_PM_SLEEP */
723 #ifdef CONFIG_SUSPEND
724 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
727 * Some BIOSes forget to clear Root PME Status bits after system
728 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
729 * Clear those bits now just in case (shouldn't hurt).
731 if (pci_is_pcie(pci_dev) &&
732 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
733 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
734 pcie_clear_root_pme_status(pci_dev);
737 static int pci_pm_suspend(struct device *dev)
739 struct pci_dev *pci_dev = to_pci_dev(dev);
740 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
742 pci_dev->skip_bus_pm = false;
744 if (pci_has_legacy_pm_support(pci_dev))
745 return pci_legacy_suspend(dev, PMSG_SUSPEND);
748 pci_pm_default_suspend(pci_dev);
753 * PCI devices suspended at run time may need to be resumed at this
754 * point, because in general it may be necessary to reconfigure them for
755 * system suspend. Namely, if the device is expected to wake up the
756 * system from the sleep state, it may have to be reconfigured for this
757 * purpose, or if the device is not expected to wake up the system from
758 * the sleep state, it should be prevented from signaling wakeup events
761 * Also if the driver of the device does not indicate that its system
762 * suspend callbacks can cope with runtime-suspended devices, it is
763 * better to resume the device from runtime suspend here.
765 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
766 pci_dev_need_resume(pci_dev)) {
767 pm_runtime_resume(dev);
768 pci_dev->state_saved = false;
770 pci_dev_adjust_pme(pci_dev);
774 pci_power_t prev = pci_dev->current_state;
777 error = pm->suspend(dev);
778 suspend_report_result(pm->suspend, error);
782 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
783 && pci_dev->current_state != PCI_UNKNOWN) {
784 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
785 "PCI PM: State of device not saved by %pS\n",
793 static int pci_pm_suspend_late(struct device *dev)
795 if (dev_pm_skip_suspend(dev))
798 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
800 return pm_generic_suspend_late(dev);
803 static int pci_pm_suspend_noirq(struct device *dev)
805 struct pci_dev *pci_dev = to_pci_dev(dev);
806 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
808 if (dev_pm_skip_suspend(dev))
811 if (pci_has_legacy_pm_support(pci_dev))
812 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
815 pci_save_state(pci_dev);
819 if (pm->suspend_noirq) {
820 pci_power_t prev = pci_dev->current_state;
823 error = pm->suspend_noirq(dev);
824 suspend_report_result(pm->suspend_noirq, error);
828 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
829 && pci_dev->current_state != PCI_UNKNOWN) {
830 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
831 "PCI PM: State of device not saved by %pS\n",
837 if (pci_dev->skip_bus_pm) {
839 * Either the device is a bridge with a child in D0 below it, or
840 * the function is running for the second time in a row without
841 * going through full resume, which is possible only during
842 * suspend-to-idle in a spurious wakeup case. The device should
843 * be in D0 at this point, but if it is a bridge, it may be
844 * necessary to save its state.
846 if (!pci_dev->state_saved)
847 pci_save_state(pci_dev);
848 } else if (!pci_dev->state_saved) {
849 pci_save_state(pci_dev);
850 if (pci_power_manageable(pci_dev))
851 pci_prepare_to_sleep(pci_dev);
854 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
855 pci_power_name(pci_dev->current_state));
857 if (pci_dev->current_state == PCI_D0) {
858 pci_dev->skip_bus_pm = true;
860 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
861 * downstream device is in D0, so avoid changing the power state
862 * of the parent bridge by setting the skip_bus_pm flag for it.
864 if (pci_dev->bus->self)
865 pci_dev->bus->self->skip_bus_pm = true;
868 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
869 pci_dbg(pci_dev, "PCI PM: Skipped\n");
873 pci_pm_set_unknown_state(pci_dev);
876 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
877 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
878 * hasn't been quiesced and tries to turn it off. If the controller
879 * is already in D3, this can hang or cause memory corruption.
881 * Since the value of the COMMAND register doesn't matter once the
882 * device has been suspended, we can safely set it to 0 here.
884 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
885 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
888 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
891 * If the target system sleep state is suspend-to-idle, it is sufficient
892 * to check whether or not the device's wakeup settings are good for
893 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
894 * pci_pm_complete() to take care of fixing up the device's state
895 * anyway, if need be.
897 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
898 dev->power.may_skip_resume = false;
903 static int pci_pm_resume_noirq(struct device *dev)
905 struct pci_dev *pci_dev = to_pci_dev(dev);
906 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
907 pci_power_t prev_state = pci_dev->current_state;
908 bool skip_bus_pm = pci_dev->skip_bus_pm;
910 if (dev_pm_skip_resume(dev))
914 * In the suspend-to-idle case, devices left in D0 during suspend will
915 * stay in D0, so it is not necessary to restore or update their
916 * configuration here and attempting to put them into D0 again is
917 * pointless, so avoid doing that.
919 if (!(skip_bus_pm && pm_suspend_no_platform()))
920 pci_pm_default_resume_early(pci_dev);
922 pci_fixup_device(pci_fixup_resume_early, pci_dev);
923 pcie_pme_root_status_cleanup(pci_dev);
925 if (!skip_bus_pm && prev_state == PCI_D3cold)
926 pci_bridge_wait_for_secondary_bus(pci_dev);
928 if (pci_has_legacy_pm_support(pci_dev))
931 if (pm && pm->resume_noirq)
932 return pm->resume_noirq(dev);
937 static int pci_pm_resume_early(struct device *dev)
939 if (dev_pm_skip_resume(dev))
942 return pm_generic_resume_early(dev);
945 static int pci_pm_resume(struct device *dev)
947 struct pci_dev *pci_dev = to_pci_dev(dev);
948 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
951 * This is necessary for the suspend error path in which resume is
952 * called without restoring the standard config registers of the device.
954 if (pci_dev->state_saved)
955 pci_restore_standard_config(pci_dev);
957 if (pci_has_legacy_pm_support(pci_dev))
958 return pci_legacy_resume(dev);
960 pci_pm_default_resume(pci_dev);
964 return pm->resume(dev);
966 pci_pm_reenable_device(pci_dev);
972 #else /* !CONFIG_SUSPEND */
974 #define pci_pm_suspend NULL
975 #define pci_pm_suspend_late NULL
976 #define pci_pm_suspend_noirq NULL
977 #define pci_pm_resume NULL
978 #define pci_pm_resume_early NULL
979 #define pci_pm_resume_noirq NULL
981 #endif /* !CONFIG_SUSPEND */
983 #ifdef CONFIG_HIBERNATE_CALLBACKS
985 static int pci_pm_freeze(struct device *dev)
987 struct pci_dev *pci_dev = to_pci_dev(dev);
988 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
990 if (pci_has_legacy_pm_support(pci_dev))
991 return pci_legacy_suspend(dev, PMSG_FREEZE);
994 pci_pm_default_suspend(pci_dev);
999 * Resume all runtime-suspended devices before creating a snapshot
1000 * image of system memory, because the restore kernel generally cannot
1001 * be expected to always handle them consistently and they need to be
1002 * put into the runtime-active metastate during system resume anyway,
1003 * so it is better to ensure that the state saved in the image will be
1004 * always consistent with that.
1006 pm_runtime_resume(dev);
1007 pci_dev->state_saved = false;
1012 error = pm->freeze(dev);
1013 suspend_report_result(pm->freeze, error);
1021 static int pci_pm_freeze_noirq(struct device *dev)
1023 struct pci_dev *pci_dev = to_pci_dev(dev);
1024 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1026 if (pci_has_legacy_pm_support(pci_dev))
1027 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1029 if (pm && pm->freeze_noirq) {
1032 error = pm->freeze_noirq(dev);
1033 suspend_report_result(pm->freeze_noirq, error);
1038 if (!pci_dev->state_saved)
1039 pci_save_state(pci_dev);
1041 pci_pm_set_unknown_state(pci_dev);
1046 static int pci_pm_thaw_noirq(struct device *dev)
1048 struct pci_dev *pci_dev = to_pci_dev(dev);
1049 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1052 * The pm->thaw_noirq() callback assumes the device has been
1053 * returned to D0 and its config state has been restored.
1055 * In addition, pci_restore_state() restores MSI-X state in MMIO
1056 * space, which requires the device to be in D0, so return it to D0
1057 * in case the driver's "freeze" callbacks put it into a low-power
1060 pci_set_power_state(pci_dev, PCI_D0);
1061 pci_restore_state(pci_dev);
1063 if (pci_has_legacy_pm_support(pci_dev))
1066 if (pm && pm->thaw_noirq)
1067 return pm->thaw_noirq(dev);
1072 static int pci_pm_thaw(struct device *dev)
1074 struct pci_dev *pci_dev = to_pci_dev(dev);
1075 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1078 if (pci_has_legacy_pm_support(pci_dev))
1079 return pci_legacy_resume(dev);
1083 error = pm->thaw(dev);
1085 pci_pm_reenable_device(pci_dev);
1088 pci_dev->state_saved = false;
1093 static int pci_pm_poweroff(struct device *dev)
1095 struct pci_dev *pci_dev = to_pci_dev(dev);
1096 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1098 if (pci_has_legacy_pm_support(pci_dev))
1099 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1102 pci_pm_default_suspend(pci_dev);
1106 /* The reason to do that is the same as in pci_pm_suspend(). */
1107 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1108 pci_dev_need_resume(pci_dev)) {
1109 pm_runtime_resume(dev);
1110 pci_dev->state_saved = false;
1112 pci_dev_adjust_pme(pci_dev);
1118 error = pm->poweroff(dev);
1119 suspend_report_result(pm->poweroff, error);
1127 static int pci_pm_poweroff_late(struct device *dev)
1129 if (dev_pm_skip_suspend(dev))
1132 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1134 return pm_generic_poweroff_late(dev);
1137 static int pci_pm_poweroff_noirq(struct device *dev)
1139 struct pci_dev *pci_dev = to_pci_dev(dev);
1140 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1142 if (dev_pm_skip_suspend(dev))
1145 if (pci_has_legacy_pm_support(pci_dev))
1146 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1149 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1153 if (pm->poweroff_noirq) {
1156 error = pm->poweroff_noirq(dev);
1157 suspend_report_result(pm->poweroff_noirq, error);
1162 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1163 pci_prepare_to_sleep(pci_dev);
1166 * The reason for doing this here is the same as for the analogous code
1167 * in pci_pm_suspend_noirq().
1169 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1170 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1172 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1177 static int pci_pm_restore_noirq(struct device *dev)
1179 struct pci_dev *pci_dev = to_pci_dev(dev);
1180 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1182 pci_pm_default_resume_early(pci_dev);
1183 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1185 if (pci_has_legacy_pm_support(pci_dev))
1188 if (pm && pm->restore_noirq)
1189 return pm->restore_noirq(dev);
1194 static int pci_pm_restore(struct device *dev)
1196 struct pci_dev *pci_dev = to_pci_dev(dev);
1197 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1200 * This is necessary for the hibernation error path in which restore is
1201 * called without restoring the standard config registers of the device.
1203 if (pci_dev->state_saved)
1204 pci_restore_standard_config(pci_dev);
1206 if (pci_has_legacy_pm_support(pci_dev))
1207 return pci_legacy_resume(dev);
1209 pci_pm_default_resume(pci_dev);
1213 return pm->restore(dev);
1215 pci_pm_reenable_device(pci_dev);
1221 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1223 #define pci_pm_freeze NULL
1224 #define pci_pm_freeze_noirq NULL
1225 #define pci_pm_thaw NULL
1226 #define pci_pm_thaw_noirq NULL
1227 #define pci_pm_poweroff NULL
1228 #define pci_pm_poweroff_late NULL
1229 #define pci_pm_poweroff_noirq NULL
1230 #define pci_pm_restore NULL
1231 #define pci_pm_restore_noirq NULL
1233 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1237 static int pci_pm_runtime_suspend(struct device *dev)
1239 struct pci_dev *pci_dev = to_pci_dev(dev);
1240 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1241 pci_power_t prev = pci_dev->current_state;
1245 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1246 * but it may go to D3cold when the bridge above it runtime suspends.
1247 * Save its config space in case that happens.
1249 if (!pci_dev->driver) {
1250 pci_save_state(pci_dev);
1254 pci_dev->state_saved = false;
1255 if (pm && pm->runtime_suspend) {
1256 error = pm->runtime_suspend(dev);
1258 * -EBUSY and -EAGAIN is used to request the runtime PM core
1259 * to schedule a new suspend, so log the event only with debug
1262 if (error == -EBUSY || error == -EAGAIN) {
1263 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1264 pm->runtime_suspend, error);
1267 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1268 pm->runtime_suspend, error);
1273 pci_fixup_device(pci_fixup_suspend, pci_dev);
1275 if (pm && pm->runtime_suspend
1276 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1277 && pci_dev->current_state != PCI_UNKNOWN) {
1278 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1279 "PCI PM: State of device not saved by %pS\n",
1280 pm->runtime_suspend);
1284 if (!pci_dev->state_saved) {
1285 pci_save_state(pci_dev);
1286 pci_finish_runtime_suspend(pci_dev);
1292 static int pci_pm_runtime_resume(struct device *dev)
1294 struct pci_dev *pci_dev = to_pci_dev(dev);
1295 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1296 pci_power_t prev_state = pci_dev->current_state;
1300 * Restoring config space is necessary even if the device is not bound
1301 * to a driver because although we left it in D0, it may have gone to
1302 * D3cold when the bridge above it runtime suspended.
1304 pci_restore_standard_config(pci_dev);
1306 if (!pci_dev->driver)
1309 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1310 pci_pm_default_resume(pci_dev);
1312 if (prev_state == PCI_D3cold)
1313 pci_bridge_wait_for_secondary_bus(pci_dev);
1315 if (pm && pm->runtime_resume)
1316 error = pm->runtime_resume(dev);
1318 pci_dev->runtime_d3cold = false;
1323 static int pci_pm_runtime_idle(struct device *dev)
1325 struct pci_dev *pci_dev = to_pci_dev(dev);
1326 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1329 * If pci_dev->driver is not set (unbound), the device should
1330 * always remain in D0 regardless of the runtime PM status
1332 if (!pci_dev->driver)
1338 if (pm->runtime_idle)
1339 return pm->runtime_idle(dev);
1344 static const struct dev_pm_ops pci_dev_pm_ops = {
1345 .prepare = pci_pm_prepare,
1346 .complete = pci_pm_complete,
1347 .suspend = pci_pm_suspend,
1348 .suspend_late = pci_pm_suspend_late,
1349 .resume = pci_pm_resume,
1350 .resume_early = pci_pm_resume_early,
1351 .freeze = pci_pm_freeze,
1352 .thaw = pci_pm_thaw,
1353 .poweroff = pci_pm_poweroff,
1354 .poweroff_late = pci_pm_poweroff_late,
1355 .restore = pci_pm_restore,
1356 .suspend_noirq = pci_pm_suspend_noirq,
1357 .resume_noirq = pci_pm_resume_noirq,
1358 .freeze_noirq = pci_pm_freeze_noirq,
1359 .thaw_noirq = pci_pm_thaw_noirq,
1360 .poweroff_noirq = pci_pm_poweroff_noirq,
1361 .restore_noirq = pci_pm_restore_noirq,
1362 .runtime_suspend = pci_pm_runtime_suspend,
1363 .runtime_resume = pci_pm_runtime_resume,
1364 .runtime_idle = pci_pm_runtime_idle,
1367 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1369 #else /* !CONFIG_PM */
1371 #define pci_pm_runtime_suspend NULL
1372 #define pci_pm_runtime_resume NULL
1373 #define pci_pm_runtime_idle NULL
1375 #define PCI_PM_OPS_PTR NULL
1377 #endif /* !CONFIG_PM */
1380 * __pci_register_driver - register a new pci driver
1381 * @drv: the driver structure to register
1382 * @owner: owner module of drv
1383 * @mod_name: module name string
1385 * Adds the driver structure to the list of registered drivers.
1386 * Returns a negative value on error, otherwise 0.
1387 * If no error occurred, the driver remains registered even if
1388 * no device was claimed during registration.
1390 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1391 const char *mod_name)
1393 /* initialize common driver fields */
1394 drv->driver.name = drv->name;
1395 drv->driver.bus = &pci_bus_type;
1396 drv->driver.owner = owner;
1397 drv->driver.mod_name = mod_name;
1398 drv->driver.groups = drv->groups;
1399 drv->driver.dev_groups = drv->dev_groups;
1401 spin_lock_init(&drv->dynids.lock);
1402 INIT_LIST_HEAD(&drv->dynids.list);
1404 /* register with core */
1405 return driver_register(&drv->driver);
1407 EXPORT_SYMBOL(__pci_register_driver);
1410 * pci_unregister_driver - unregister a pci driver
1411 * @drv: the driver structure to unregister
1413 * Deletes the driver structure from the list of registered PCI drivers,
1414 * gives it a chance to clean up by calling its remove() function for
1415 * each device it was responsible for, and marks those devices as
1419 void pci_unregister_driver(struct pci_driver *drv)
1421 driver_unregister(&drv->driver);
1422 pci_free_dynids(drv);
1424 EXPORT_SYMBOL(pci_unregister_driver);
1426 static struct pci_driver pci_compat_driver = {
1431 * pci_dev_driver - get the pci_driver of a device
1432 * @dev: the device to query
1434 * Returns the appropriate pci_driver structure or %NULL if there is no
1435 * registered driver for the device.
1437 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1443 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1444 if (dev->resource[i].flags & IORESOURCE_BUSY)
1445 return &pci_compat_driver;
1449 EXPORT_SYMBOL(pci_dev_driver);
1452 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1453 * @dev: the PCI device structure to match against
1454 * @drv: the device driver to search for matching PCI device id structures
1456 * Used by a driver to check whether a PCI device present in the
1457 * system is in its list of supported devices. Returns the matching
1458 * pci_device_id structure or %NULL if there is no match.
1460 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1462 struct pci_dev *pci_dev = to_pci_dev(dev);
1463 struct pci_driver *pci_drv;
1464 const struct pci_device_id *found_id;
1466 if (!pci_dev->match_driver)
1469 pci_drv = to_pci_driver(drv);
1470 found_id = pci_match_device(pci_drv, pci_dev);
1478 * pci_dev_get - increments the reference count of the pci device structure
1479 * @dev: the device being referenced
1481 * Each live reference to a device should be refcounted.
1483 * Drivers for PCI devices should normally record such references in
1484 * their probe() methods, when they bind to a device, and release
1485 * them by calling pci_dev_put(), in their disconnect() methods.
1487 * A pointer to the device with the incremented reference counter is returned.
1489 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1492 get_device(&dev->dev);
1495 EXPORT_SYMBOL(pci_dev_get);
1498 * pci_dev_put - release a use of the pci device structure
1499 * @dev: device that's been disconnected
1501 * Must be called when a user of a device is finished with it. When the last
1502 * user of the device calls this function, the memory of the device is freed.
1504 void pci_dev_put(struct pci_dev *dev)
1507 put_device(&dev->dev);
1509 EXPORT_SYMBOL(pci_dev_put);
1511 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1513 struct pci_dev *pdev;
1518 pdev = to_pci_dev(dev);
1520 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1523 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1526 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1527 pdev->subsystem_device))
1530 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1533 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1534 pdev->vendor, pdev->device,
1535 pdev->subsystem_vendor, pdev->subsystem_device,
1536 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1543 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1545 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1546 * @pdev: PCI device undergoing error recovery
1547 * @err_type: type of error event
1549 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1555 case PCI_ERS_RESULT_NONE:
1556 case PCI_ERS_RESULT_CAN_RECOVER:
1557 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1558 envp[idx++] = "DEVICE_ONLINE=0";
1560 case PCI_ERS_RESULT_RECOVERED:
1561 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1562 envp[idx++] = "DEVICE_ONLINE=1";
1564 case PCI_ERS_RESULT_DISCONNECT:
1565 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1566 envp[idx++] = "DEVICE_ONLINE=0";
1574 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1579 static int pci_bus_num_vf(struct device *dev)
1581 return pci_num_vf(to_pci_dev(dev));
1585 * pci_dma_configure - Setup DMA configuration
1586 * @dev: ptr to dev structure
1588 * Function to update PCI devices's DMA configuration using the same
1589 * info from the OF node or ACPI node of host bridge's parent (if any).
1591 static int pci_dma_configure(struct device *dev)
1593 struct device *bridge;
1596 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1598 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1599 bridge->parent->of_node) {
1600 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1601 } else if (has_acpi_companion(bridge)) {
1602 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1604 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1607 pci_put_host_bridge_device(bridge);
1611 struct bus_type pci_bus_type = {
1613 .match = pci_bus_match,
1614 .uevent = pci_uevent,
1615 .probe = pci_device_probe,
1616 .remove = pci_device_remove,
1617 .shutdown = pci_device_shutdown,
1618 .dev_groups = pci_dev_groups,
1619 .bus_groups = pci_bus_groups,
1620 .drv_groups = pci_drv_groups,
1621 .pm = PCI_PM_OPS_PTR,
1622 .num_vf = pci_bus_num_vf,
1623 .dma_configure = pci_dma_configure,
1625 EXPORT_SYMBOL(pci_bus_type);
1627 #ifdef CONFIG_PCIEPORTBUS
1628 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1630 struct pcie_device *pciedev;
1631 struct pcie_port_service_driver *driver;
1633 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1636 pciedev = to_pcie_device(dev);
1637 driver = to_service_driver(drv);
1639 if (driver->service != pciedev->service)
1642 if (driver->port_type != PCIE_ANY_PORT &&
1643 driver->port_type != pci_pcie_type(pciedev->port))
1649 struct bus_type pcie_port_bus_type = {
1650 .name = "pci_express",
1651 .match = pcie_port_bus_match,
1653 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1656 static int __init pci_driver_init(void)
1660 ret = bus_register(&pci_bus_type);
1664 #ifdef CONFIG_PCIEPORTBUS
1665 ret = bus_register(&pcie_port_bus_type);
1669 dma_debug_add_bus(&pci_bus_type);
1672 postcore_initcall(pci_driver_init);