1 // SPDX-License-Identifier: GPL-2.0
3 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
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 struct drv_dev_and_id ddi = { drv, dev, id };
356 * Execute driver initialization on node where the device is
357 * attached. This way the driver likely allocates its local memory
360 node = dev_to_node(&dev->dev);
363 cpu_hotplug_disable();
366 * Prevent nesting work_on_cpu() for the case where a Virtual Function
367 * device is probed from work_on_cpu() of the Physical device.
369 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
370 pci_physfn_is_probed(dev)) {
373 cpumask_var_t wq_domain_mask;
375 if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
379 cpumask_and(wq_domain_mask,
380 housekeeping_cpumask(HK_TYPE_WQ),
381 housekeeping_cpumask(HK_TYPE_DOMAIN));
383 cpu = cpumask_any_and(cpumask_of_node(node),
385 free_cpumask_var(wq_domain_mask);
388 if (cpu < nr_cpu_ids)
389 error = work_on_cpu(cpu, local_pci_probe, &ddi);
391 error = local_pci_probe(&ddi);
394 cpu_hotplug_enable();
399 * __pci_device_probe - check if a driver wants to claim a specific PCI device
400 * @drv: driver to call to check if it wants the PCI device
401 * @pci_dev: PCI device being probed
403 * returns 0 on success, else error.
404 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
406 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
408 const struct pci_device_id *id;
414 id = pci_match_device(drv, pci_dev);
416 error = pci_call_probe(drv, pci_dev, id);
421 int __weak pcibios_alloc_irq(struct pci_dev *dev)
426 void __weak pcibios_free_irq(struct pci_dev *dev)
430 #ifdef CONFIG_PCI_IOV
431 static inline bool pci_device_can_probe(struct pci_dev *pdev)
433 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
434 pdev->driver_override);
437 static inline bool pci_device_can_probe(struct pci_dev *pdev)
443 static int pci_device_probe(struct device *dev)
446 struct pci_dev *pci_dev = to_pci_dev(dev);
447 struct pci_driver *drv = to_pci_driver(dev->driver);
449 if (!pci_device_can_probe(pci_dev))
452 pci_assign_irq(pci_dev);
454 error = pcibios_alloc_irq(pci_dev);
458 pci_dev_get(pci_dev);
459 error = __pci_device_probe(drv, pci_dev);
461 pcibios_free_irq(pci_dev);
462 pci_dev_put(pci_dev);
468 static void pci_device_remove(struct device *dev)
470 struct pci_dev *pci_dev = to_pci_dev(dev);
471 struct pci_driver *drv = pci_dev->driver;
474 pm_runtime_get_sync(dev);
475 drv->remove(pci_dev);
476 pm_runtime_put_noidle(dev);
478 pcibios_free_irq(pci_dev);
479 pci_dev->driver = NULL;
480 pci_iov_remove(pci_dev);
482 /* Undo the runtime PM settings in local_pci_probe() */
483 pm_runtime_put_sync(dev);
486 * If the device is still on, set the power state as "unknown",
487 * since it might change by the next time we load the driver.
489 if (pci_dev->current_state == PCI_D0)
490 pci_dev->current_state = PCI_UNKNOWN;
493 * We would love to complain here if pci_dev->is_enabled is set, that
494 * the driver should have called pci_disable_device(), but the
495 * unfortunate fact is there are too many odd BIOS and bridge setups
496 * that don't like drivers doing that all of the time.
497 * Oh well, we can dream of sane hardware when we sleep, no matter how
498 * horrible the crap we have to deal with is when we are awake...
501 pci_dev_put(pci_dev);
504 static void pci_device_shutdown(struct device *dev)
506 struct pci_dev *pci_dev = to_pci_dev(dev);
507 struct pci_driver *drv = pci_dev->driver;
509 pm_runtime_resume(dev);
511 if (drv && drv->shutdown)
512 drv->shutdown(pci_dev);
515 * If this is a kexec reboot, turn off Bus Master bit on the
516 * device to tell it to not continue to do DMA. Don't touch
517 * devices in D3cold or unknown states.
518 * If it is not a kexec reboot, firmware will hit the PCI
519 * devices with big hammer and stop their DMA any way.
521 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
522 pci_clear_master(pci_dev);
527 /* Auxiliary functions used for system resume and run-time resume. */
530 * pci_restore_standard_config - restore standard config registers of PCI device
531 * @pci_dev: PCI device to handle
533 static int pci_restore_standard_config(struct pci_dev *pci_dev)
535 pci_update_current_state(pci_dev, PCI_UNKNOWN);
537 if (pci_dev->current_state != PCI_D0) {
538 int error = pci_set_power_state(pci_dev, PCI_D0);
543 pci_restore_state(pci_dev);
544 pci_pme_restore(pci_dev);
548 static void pci_pm_default_resume(struct pci_dev *pci_dev)
550 pci_fixup_device(pci_fixup_resume, pci_dev);
551 pci_enable_wake(pci_dev, PCI_D0, false);
556 #ifdef CONFIG_PM_SLEEP
558 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
560 pci_power_up(pci_dev);
561 pci_update_current_state(pci_dev, PCI_D0);
562 pci_restore_state(pci_dev);
563 pci_pme_restore(pci_dev);
567 * Default "suspend" method for devices that have no driver provided suspend,
568 * or not even a driver at all (second part).
570 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
573 * mark its power state as "unknown", since we don't know if
574 * e.g. the BIOS will change its device state when we suspend.
576 if (pci_dev->current_state == PCI_D0)
577 pci_dev->current_state = PCI_UNKNOWN;
581 * Default "resume" method for devices that have no driver provided resume,
582 * or not even a driver at all (second part).
584 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
588 /* if the device was enabled before suspend, re-enable */
589 retval = pci_reenable_device(pci_dev);
591 * if the device was busmaster before the suspend, make it busmaster
594 if (pci_dev->is_busmaster)
595 pci_set_master(pci_dev);
600 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
602 struct pci_dev *pci_dev = to_pci_dev(dev);
603 struct pci_driver *drv = pci_dev->driver;
605 if (drv && drv->suspend) {
606 pci_power_t prev = pci_dev->current_state;
609 error = drv->suspend(pci_dev, state);
610 suspend_report_result(dev, drv->suspend, error);
614 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
615 && pci_dev->current_state != PCI_UNKNOWN) {
616 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
617 "PCI PM: Device state not saved by %pS\n",
622 pci_fixup_device(pci_fixup_suspend, pci_dev);
627 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
629 struct pci_dev *pci_dev = to_pci_dev(dev);
631 if (!pci_dev->state_saved)
632 pci_save_state(pci_dev);
634 pci_pm_set_unknown_state(pci_dev);
636 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
641 static int pci_legacy_resume(struct device *dev)
643 struct pci_dev *pci_dev = to_pci_dev(dev);
644 struct pci_driver *drv = pci_dev->driver;
646 pci_fixup_device(pci_fixup_resume, pci_dev);
648 return drv && drv->resume ?
649 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
652 /* Auxiliary functions used by the new power management framework */
654 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
656 /* Disable non-bridge devices without PM support */
657 if (!pci_has_subordinate(pci_dev))
658 pci_disable_enabled_device(pci_dev);
661 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
663 struct pci_driver *drv = pci_dev->driver;
664 bool ret = drv && (drv->suspend || drv->resume);
667 * Legacy PM support is used by default, so warn if the new framework is
668 * supported as well. Drivers are supposed to support either the
669 * former, or the latter, but not both at the same time.
671 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
672 pci_dev->vendor, pci_dev->device);
677 /* New power management framework */
679 static int pci_pm_prepare(struct device *dev)
681 struct pci_dev *pci_dev = to_pci_dev(dev);
682 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
684 if (pm && pm->prepare) {
685 int error = pm->prepare(dev);
689 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
692 if (pci_dev_need_resume(pci_dev))
696 * The PME setting needs to be adjusted here in case the direct-complete
697 * optimization is used with respect to this device.
699 pci_dev_adjust_pme(pci_dev);
703 static void pci_pm_complete(struct device *dev)
705 struct pci_dev *pci_dev = to_pci_dev(dev);
707 pci_dev_complete_resume(pci_dev);
708 pm_generic_complete(dev);
710 /* Resume device if platform firmware has put it in reset-power-on */
711 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
712 pci_power_t pre_sleep_state = pci_dev->current_state;
714 pci_refresh_power_state(pci_dev);
716 * On platforms with ACPI this check may also trigger for
717 * devices sharing power resources if one of those power
718 * resources has been activated as a result of a change of the
719 * power state of another device sharing it. However, in that
720 * case it is also better to resume the device, in general.
722 if (pci_dev->current_state < pre_sleep_state)
723 pm_request_resume(dev);
727 #else /* !CONFIG_PM_SLEEP */
729 #define pci_pm_prepare NULL
730 #define pci_pm_complete NULL
732 #endif /* !CONFIG_PM_SLEEP */
734 #ifdef CONFIG_SUSPEND
735 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
738 * Some BIOSes forget to clear Root PME Status bits after system
739 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
740 * Clear those bits now just in case (shouldn't hurt).
742 if (pci_is_pcie(pci_dev) &&
743 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
744 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
745 pcie_clear_root_pme_status(pci_dev);
748 static int pci_pm_suspend(struct device *dev)
750 struct pci_dev *pci_dev = to_pci_dev(dev);
751 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
753 pci_dev->skip_bus_pm = false;
755 if (pci_has_legacy_pm_support(pci_dev))
756 return pci_legacy_suspend(dev, PMSG_SUSPEND);
759 pci_pm_default_suspend(pci_dev);
764 * PCI devices suspended at run time may need to be resumed at this
765 * point, because in general it may be necessary to reconfigure them for
766 * system suspend. Namely, if the device is expected to wake up the
767 * system from the sleep state, it may have to be reconfigured for this
768 * purpose, or if the device is not expected to wake up the system from
769 * the sleep state, it should be prevented from signaling wakeup events
772 * Also if the driver of the device does not indicate that its system
773 * suspend callbacks can cope with runtime-suspended devices, it is
774 * better to resume the device from runtime suspend here.
776 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
777 pci_dev_need_resume(pci_dev)) {
778 pm_runtime_resume(dev);
779 pci_dev->state_saved = false;
781 pci_dev_adjust_pme(pci_dev);
785 pci_power_t prev = pci_dev->current_state;
788 error = pm->suspend(dev);
789 suspend_report_result(dev, pm->suspend, error);
793 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
794 && pci_dev->current_state != PCI_UNKNOWN) {
795 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
796 "PCI PM: State of device not saved by %pS\n",
804 static int pci_pm_suspend_late(struct device *dev)
806 if (dev_pm_skip_suspend(dev))
809 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
811 return pm_generic_suspend_late(dev);
814 static int pci_pm_suspend_noirq(struct device *dev)
816 struct pci_dev *pci_dev = to_pci_dev(dev);
817 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
819 if (dev_pm_skip_suspend(dev))
822 if (pci_has_legacy_pm_support(pci_dev))
823 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
826 pci_save_state(pci_dev);
830 if (pm->suspend_noirq) {
831 pci_power_t prev = pci_dev->current_state;
834 error = pm->suspend_noirq(dev);
835 suspend_report_result(dev, pm->suspend_noirq, error);
839 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
840 && pci_dev->current_state != PCI_UNKNOWN) {
841 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
842 "PCI PM: State of device not saved by %pS\n",
848 if (pci_dev->skip_bus_pm) {
850 * Either the device is a bridge with a child in D0 below it, or
851 * the function is running for the second time in a row without
852 * going through full resume, which is possible only during
853 * suspend-to-idle in a spurious wakeup case. The device should
854 * be in D0 at this point, but if it is a bridge, it may be
855 * necessary to save its state.
857 if (!pci_dev->state_saved)
858 pci_save_state(pci_dev);
859 } else if (!pci_dev->state_saved) {
860 pci_save_state(pci_dev);
861 if (pci_power_manageable(pci_dev))
862 pci_prepare_to_sleep(pci_dev);
865 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
866 pci_power_name(pci_dev->current_state));
868 if (pci_dev->current_state == PCI_D0) {
869 pci_dev->skip_bus_pm = true;
871 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
872 * downstream device is in D0, so avoid changing the power state
873 * of the parent bridge by setting the skip_bus_pm flag for it.
875 if (pci_dev->bus->self)
876 pci_dev->bus->self->skip_bus_pm = true;
879 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
880 pci_dbg(pci_dev, "PCI PM: Skipped\n");
884 pci_pm_set_unknown_state(pci_dev);
887 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
888 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
889 * hasn't been quiesced and tries to turn it off. If the controller
890 * is already in D3, this can hang or cause memory corruption.
892 * Since the value of the COMMAND register doesn't matter once the
893 * device has been suspended, we can safely set it to 0 here.
895 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
896 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
899 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
902 * If the target system sleep state is suspend-to-idle, it is sufficient
903 * to check whether or not the device's wakeup settings are good for
904 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
905 * pci_pm_complete() to take care of fixing up the device's state
906 * anyway, if need be.
908 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
909 dev->power.may_skip_resume = false;
914 static int pci_pm_resume_noirq(struct device *dev)
916 struct pci_dev *pci_dev = to_pci_dev(dev);
917 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
918 pci_power_t prev_state = pci_dev->current_state;
919 bool skip_bus_pm = pci_dev->skip_bus_pm;
921 if (dev_pm_skip_resume(dev))
925 * In the suspend-to-idle case, devices left in D0 during suspend will
926 * stay in D0, so it is not necessary to restore or update their
927 * configuration here and attempting to put them into D0 again is
928 * pointless, so avoid doing that.
930 if (!(skip_bus_pm && pm_suspend_no_platform()))
931 pci_pm_default_resume_early(pci_dev);
933 pci_fixup_device(pci_fixup_resume_early, pci_dev);
934 pcie_pme_root_status_cleanup(pci_dev);
936 if (!skip_bus_pm && prev_state == PCI_D3cold)
937 pci_bridge_wait_for_secondary_bus(pci_dev);
939 if (pci_has_legacy_pm_support(pci_dev))
942 if (pm && pm->resume_noirq)
943 return pm->resume_noirq(dev);
948 static int pci_pm_resume_early(struct device *dev)
950 if (dev_pm_skip_resume(dev))
953 return pm_generic_resume_early(dev);
956 static int pci_pm_resume(struct device *dev)
958 struct pci_dev *pci_dev = to_pci_dev(dev);
959 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
962 * This is necessary for the suspend error path in which resume is
963 * called without restoring the standard config registers of the device.
965 if (pci_dev->state_saved)
966 pci_restore_standard_config(pci_dev);
968 if (pci_has_legacy_pm_support(pci_dev))
969 return pci_legacy_resume(dev);
971 pci_pm_default_resume(pci_dev);
975 return pm->resume(dev);
977 pci_pm_reenable_device(pci_dev);
983 #else /* !CONFIG_SUSPEND */
985 #define pci_pm_suspend NULL
986 #define pci_pm_suspend_late NULL
987 #define pci_pm_suspend_noirq NULL
988 #define pci_pm_resume NULL
989 #define pci_pm_resume_early NULL
990 #define pci_pm_resume_noirq NULL
992 #endif /* !CONFIG_SUSPEND */
994 #ifdef CONFIG_HIBERNATE_CALLBACKS
996 static int pci_pm_freeze(struct device *dev)
998 struct pci_dev *pci_dev = to_pci_dev(dev);
999 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1001 if (pci_has_legacy_pm_support(pci_dev))
1002 return pci_legacy_suspend(dev, PMSG_FREEZE);
1005 pci_pm_default_suspend(pci_dev);
1010 * Resume all runtime-suspended devices before creating a snapshot
1011 * image of system memory, because the restore kernel generally cannot
1012 * be expected to always handle them consistently and they need to be
1013 * put into the runtime-active metastate during system resume anyway,
1014 * so it is better to ensure that the state saved in the image will be
1015 * always consistent with that.
1017 pm_runtime_resume(dev);
1018 pci_dev->state_saved = false;
1023 error = pm->freeze(dev);
1024 suspend_report_result(dev, pm->freeze, error);
1032 static int pci_pm_freeze_noirq(struct device *dev)
1034 struct pci_dev *pci_dev = to_pci_dev(dev);
1035 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1037 if (pci_has_legacy_pm_support(pci_dev))
1038 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1040 if (pm && pm->freeze_noirq) {
1043 error = pm->freeze_noirq(dev);
1044 suspend_report_result(dev, pm->freeze_noirq, error);
1049 if (!pci_dev->state_saved)
1050 pci_save_state(pci_dev);
1052 pci_pm_set_unknown_state(pci_dev);
1057 static int pci_pm_thaw_noirq(struct device *dev)
1059 struct pci_dev *pci_dev = to_pci_dev(dev);
1060 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1063 * The pm->thaw_noirq() callback assumes the device has been
1064 * returned to D0 and its config state has been restored.
1066 * In addition, pci_restore_state() restores MSI-X state in MMIO
1067 * space, which requires the device to be in D0, so return it to D0
1068 * in case the driver's "freeze" callbacks put it into a low-power
1071 pci_set_power_state(pci_dev, PCI_D0);
1072 pci_restore_state(pci_dev);
1074 if (pci_has_legacy_pm_support(pci_dev))
1077 if (pm && pm->thaw_noirq)
1078 return pm->thaw_noirq(dev);
1083 static int pci_pm_thaw(struct device *dev)
1085 struct pci_dev *pci_dev = to_pci_dev(dev);
1086 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1089 if (pci_has_legacy_pm_support(pci_dev))
1090 return pci_legacy_resume(dev);
1094 error = pm->thaw(dev);
1096 pci_pm_reenable_device(pci_dev);
1099 pci_dev->state_saved = false;
1104 static int pci_pm_poweroff(struct device *dev)
1106 struct pci_dev *pci_dev = to_pci_dev(dev);
1107 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1109 if (pci_has_legacy_pm_support(pci_dev))
1110 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1113 pci_pm_default_suspend(pci_dev);
1117 /* The reason to do that is the same as in pci_pm_suspend(). */
1118 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1119 pci_dev_need_resume(pci_dev)) {
1120 pm_runtime_resume(dev);
1121 pci_dev->state_saved = false;
1123 pci_dev_adjust_pme(pci_dev);
1129 error = pm->poweroff(dev);
1130 suspend_report_result(dev, pm->poweroff, error);
1138 static int pci_pm_poweroff_late(struct device *dev)
1140 if (dev_pm_skip_suspend(dev))
1143 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1145 return pm_generic_poweroff_late(dev);
1148 static int pci_pm_poweroff_noirq(struct device *dev)
1150 struct pci_dev *pci_dev = to_pci_dev(dev);
1151 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1153 if (dev_pm_skip_suspend(dev))
1156 if (pci_has_legacy_pm_support(pci_dev))
1157 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1160 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1164 if (pm->poweroff_noirq) {
1167 error = pm->poweroff_noirq(dev);
1168 suspend_report_result(dev, pm->poweroff_noirq, error);
1173 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1174 pci_prepare_to_sleep(pci_dev);
1177 * The reason for doing this here is the same as for the analogous code
1178 * in pci_pm_suspend_noirq().
1180 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1181 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1183 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1188 static int pci_pm_restore_noirq(struct device *dev)
1190 struct pci_dev *pci_dev = to_pci_dev(dev);
1191 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1193 pci_pm_default_resume_early(pci_dev);
1194 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1196 if (pci_has_legacy_pm_support(pci_dev))
1199 if (pm && pm->restore_noirq)
1200 return pm->restore_noirq(dev);
1205 static int pci_pm_restore(struct device *dev)
1207 struct pci_dev *pci_dev = to_pci_dev(dev);
1208 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1211 * This is necessary for the hibernation error path in which restore is
1212 * called without restoring the standard config registers of the device.
1214 if (pci_dev->state_saved)
1215 pci_restore_standard_config(pci_dev);
1217 if (pci_has_legacy_pm_support(pci_dev))
1218 return pci_legacy_resume(dev);
1220 pci_pm_default_resume(pci_dev);
1224 return pm->restore(dev);
1226 pci_pm_reenable_device(pci_dev);
1232 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1234 #define pci_pm_freeze NULL
1235 #define pci_pm_freeze_noirq NULL
1236 #define pci_pm_thaw NULL
1237 #define pci_pm_thaw_noirq NULL
1238 #define pci_pm_poweroff NULL
1239 #define pci_pm_poweroff_late NULL
1240 #define pci_pm_poweroff_noirq NULL
1241 #define pci_pm_restore NULL
1242 #define pci_pm_restore_noirq NULL
1244 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1248 static int pci_pm_runtime_suspend(struct device *dev)
1250 struct pci_dev *pci_dev = to_pci_dev(dev);
1251 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1252 pci_power_t prev = pci_dev->current_state;
1256 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1257 * but it may go to D3cold when the bridge above it runtime suspends.
1258 * Save its config space in case that happens.
1260 if (!pci_dev->driver) {
1261 pci_save_state(pci_dev);
1265 pci_dev->state_saved = false;
1266 if (pm && pm->runtime_suspend) {
1267 error = pm->runtime_suspend(dev);
1269 * -EBUSY and -EAGAIN is used to request the runtime PM core
1270 * to schedule a new suspend, so log the event only with debug
1273 if (error == -EBUSY || error == -EAGAIN) {
1274 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1275 pm->runtime_suspend, error);
1278 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1279 pm->runtime_suspend, error);
1284 pci_fixup_device(pci_fixup_suspend, pci_dev);
1286 if (pm && pm->runtime_suspend
1287 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1288 && pci_dev->current_state != PCI_UNKNOWN) {
1289 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1290 "PCI PM: State of device not saved by %pS\n",
1291 pm->runtime_suspend);
1295 if (!pci_dev->state_saved) {
1296 pci_save_state(pci_dev);
1297 pci_finish_runtime_suspend(pci_dev);
1303 static int pci_pm_runtime_resume(struct device *dev)
1305 struct pci_dev *pci_dev = to_pci_dev(dev);
1306 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1307 pci_power_t prev_state = pci_dev->current_state;
1311 * Restoring config space is necessary even if the device is not bound
1312 * to a driver because although we left it in D0, it may have gone to
1313 * D3cold when the bridge above it runtime suspended.
1315 pci_restore_standard_config(pci_dev);
1317 if (!pci_dev->driver)
1320 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1321 pci_pm_default_resume(pci_dev);
1323 if (prev_state == PCI_D3cold)
1324 pci_bridge_wait_for_secondary_bus(pci_dev);
1326 if (pm && pm->runtime_resume)
1327 error = pm->runtime_resume(dev);
1329 pci_dev->runtime_d3cold = false;
1334 static int pci_pm_runtime_idle(struct device *dev)
1336 struct pci_dev *pci_dev = to_pci_dev(dev);
1337 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1340 * If pci_dev->driver is not set (unbound), the device should
1341 * always remain in D0 regardless of the runtime PM status
1343 if (!pci_dev->driver)
1349 if (pm->runtime_idle)
1350 return pm->runtime_idle(dev);
1355 static const struct dev_pm_ops pci_dev_pm_ops = {
1356 .prepare = pci_pm_prepare,
1357 .complete = pci_pm_complete,
1358 .suspend = pci_pm_suspend,
1359 .suspend_late = pci_pm_suspend_late,
1360 .resume = pci_pm_resume,
1361 .resume_early = pci_pm_resume_early,
1362 .freeze = pci_pm_freeze,
1363 .thaw = pci_pm_thaw,
1364 .poweroff = pci_pm_poweroff,
1365 .poweroff_late = pci_pm_poweroff_late,
1366 .restore = pci_pm_restore,
1367 .suspend_noirq = pci_pm_suspend_noirq,
1368 .resume_noirq = pci_pm_resume_noirq,
1369 .freeze_noirq = pci_pm_freeze_noirq,
1370 .thaw_noirq = pci_pm_thaw_noirq,
1371 .poweroff_noirq = pci_pm_poweroff_noirq,
1372 .restore_noirq = pci_pm_restore_noirq,
1373 .runtime_suspend = pci_pm_runtime_suspend,
1374 .runtime_resume = pci_pm_runtime_resume,
1375 .runtime_idle = pci_pm_runtime_idle,
1378 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1380 #else /* !CONFIG_PM */
1382 #define pci_pm_runtime_suspend NULL
1383 #define pci_pm_runtime_resume NULL
1384 #define pci_pm_runtime_idle NULL
1386 #define PCI_PM_OPS_PTR NULL
1388 #endif /* !CONFIG_PM */
1391 * __pci_register_driver - register a new pci driver
1392 * @drv: the driver structure to register
1393 * @owner: owner module of drv
1394 * @mod_name: module name string
1396 * Adds the driver structure to the list of registered drivers.
1397 * Returns a negative value on error, otherwise 0.
1398 * If no error occurred, the driver remains registered even if
1399 * no device was claimed during registration.
1401 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1402 const char *mod_name)
1404 /* initialize common driver fields */
1405 drv->driver.name = drv->name;
1406 drv->driver.bus = &pci_bus_type;
1407 drv->driver.owner = owner;
1408 drv->driver.mod_name = mod_name;
1409 drv->driver.groups = drv->groups;
1410 drv->driver.dev_groups = drv->dev_groups;
1412 spin_lock_init(&drv->dynids.lock);
1413 INIT_LIST_HEAD(&drv->dynids.list);
1415 /* register with core */
1416 return driver_register(&drv->driver);
1418 EXPORT_SYMBOL(__pci_register_driver);
1421 * pci_unregister_driver - unregister a pci driver
1422 * @drv: the driver structure to unregister
1424 * Deletes the driver structure from the list of registered PCI drivers,
1425 * gives it a chance to clean up by calling its remove() function for
1426 * each device it was responsible for, and marks those devices as
1430 void pci_unregister_driver(struct pci_driver *drv)
1432 driver_unregister(&drv->driver);
1433 pci_free_dynids(drv);
1435 EXPORT_SYMBOL(pci_unregister_driver);
1437 static struct pci_driver pci_compat_driver = {
1442 * pci_dev_driver - get the pci_driver of a device
1443 * @dev: the device to query
1445 * Returns the appropriate pci_driver structure or %NULL if there is no
1446 * registered driver for the device.
1448 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1454 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1455 if (dev->resource[i].flags & IORESOURCE_BUSY)
1456 return &pci_compat_driver;
1460 EXPORT_SYMBOL(pci_dev_driver);
1463 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1464 * @dev: the PCI device structure to match against
1465 * @drv: the device driver to search for matching PCI device id structures
1467 * Used by a driver to check whether a PCI device present in the
1468 * system is in its list of supported devices. Returns the matching
1469 * pci_device_id structure or %NULL if there is no match.
1471 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1473 struct pci_dev *pci_dev = to_pci_dev(dev);
1474 struct pci_driver *pci_drv;
1475 const struct pci_device_id *found_id;
1477 if (!pci_dev->match_driver)
1480 pci_drv = to_pci_driver(drv);
1481 found_id = pci_match_device(pci_drv, pci_dev);
1489 * pci_dev_get - increments the reference count of the pci device structure
1490 * @dev: the device being referenced
1492 * Each live reference to a device should be refcounted.
1494 * Drivers for PCI devices should normally record such references in
1495 * their probe() methods, when they bind to a device, and release
1496 * them by calling pci_dev_put(), in their disconnect() methods.
1498 * A pointer to the device with the incremented reference counter is returned.
1500 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1503 get_device(&dev->dev);
1506 EXPORT_SYMBOL(pci_dev_get);
1509 * pci_dev_put - release a use of the pci device structure
1510 * @dev: device that's been disconnected
1512 * Must be called when a user of a device is finished with it. When the last
1513 * user of the device calls this function, the memory of the device is freed.
1515 void pci_dev_put(struct pci_dev *dev)
1518 put_device(&dev->dev);
1520 EXPORT_SYMBOL(pci_dev_put);
1522 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1524 struct pci_dev *pdev;
1529 pdev = to_pci_dev(dev);
1531 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1534 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1537 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1538 pdev->subsystem_device))
1541 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1544 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1545 pdev->vendor, pdev->device,
1546 pdev->subsystem_vendor, pdev->subsystem_device,
1547 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1554 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1556 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1557 * @pdev: PCI device undergoing error recovery
1558 * @err_type: type of error event
1560 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1566 case PCI_ERS_RESULT_NONE:
1567 case PCI_ERS_RESULT_CAN_RECOVER:
1568 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1569 envp[idx++] = "DEVICE_ONLINE=0";
1571 case PCI_ERS_RESULT_RECOVERED:
1572 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1573 envp[idx++] = "DEVICE_ONLINE=1";
1575 case PCI_ERS_RESULT_DISCONNECT:
1576 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1577 envp[idx++] = "DEVICE_ONLINE=0";
1585 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1590 static int pci_bus_num_vf(struct device *dev)
1592 return pci_num_vf(to_pci_dev(dev));
1596 * pci_dma_configure - Setup DMA configuration
1597 * @dev: ptr to dev structure
1599 * Function to update PCI devices's DMA configuration using the same
1600 * info from the OF node or ACPI node of host bridge's parent (if any).
1602 static int pci_dma_configure(struct device *dev)
1604 struct device *bridge;
1607 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1609 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1610 bridge->parent->of_node) {
1611 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1612 } else if (has_acpi_companion(bridge)) {
1613 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1615 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1618 pci_put_host_bridge_device(bridge);
1622 struct bus_type pci_bus_type = {
1624 .match = pci_bus_match,
1625 .uevent = pci_uevent,
1626 .probe = pci_device_probe,
1627 .remove = pci_device_remove,
1628 .shutdown = pci_device_shutdown,
1629 .dev_groups = pci_dev_groups,
1630 .bus_groups = pci_bus_groups,
1631 .drv_groups = pci_drv_groups,
1632 .pm = PCI_PM_OPS_PTR,
1633 .num_vf = pci_bus_num_vf,
1634 .dma_configure = pci_dma_configure,
1636 EXPORT_SYMBOL(pci_bus_type);
1638 #ifdef CONFIG_PCIEPORTBUS
1639 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1641 struct pcie_device *pciedev;
1642 struct pcie_port_service_driver *driver;
1644 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1647 pciedev = to_pcie_device(dev);
1648 driver = to_service_driver(drv);
1650 if (driver->service != pciedev->service)
1653 if (driver->port_type != PCIE_ANY_PORT &&
1654 driver->port_type != pci_pcie_type(pciedev->port))
1660 struct bus_type pcie_port_bus_type = {
1661 .name = "pci_express",
1662 .match = pcie_port_bus_match,
1664 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1667 static int __init pci_driver_init(void)
1671 ret = bus_register(&pci_bus_type);
1675 #ifdef CONFIG_PCIEPORTBUS
1676 ret = bus_register(&pcie_port_bus_type);
1680 dma_debug_add_bus(&pci_bus_type);
1683 postcore_initcall(pci_driver_init);