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 rc = pci_drv->probe(pci_dev, ddi->id);
326 pm_runtime_put_sync(dev);
330 * Probe function should return < 0 for failure, 0 for success
331 * Treat values > 0 as success, but warn.
333 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
338 static bool pci_physfn_is_probed(struct pci_dev *dev)
340 #ifdef CONFIG_PCI_IOV
341 return dev->is_virtfn && dev->physfn->is_probed;
347 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
348 const struct pci_device_id *id)
350 int error, node, cpu;
351 int hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
352 struct drv_dev_and_id ddi = { drv, dev, id };
355 * Execute driver initialization on node where the device is
356 * attached. This way the driver likely allocates its local memory
359 node = dev_to_node(&dev->dev);
362 cpu_hotplug_disable();
365 * Prevent nesting work_on_cpu() for the case where a Virtual Function
366 * device is probed from work_on_cpu() of the Physical device.
368 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
369 pci_physfn_is_probed(dev))
372 cpu = cpumask_any_and(cpumask_of_node(node),
373 housekeeping_cpumask(hk_flags));
375 if (cpu < nr_cpu_ids)
376 error = work_on_cpu(cpu, local_pci_probe, &ddi);
378 error = local_pci_probe(&ddi);
381 cpu_hotplug_enable();
386 * __pci_device_probe - check if a driver wants to claim a specific PCI device
387 * @drv: driver to call to check if it wants the PCI device
388 * @pci_dev: PCI device being probed
390 * returns 0 on success, else error.
392 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
394 const struct pci_device_id *id;
400 id = pci_match_device(drv, pci_dev);
402 error = pci_call_probe(drv, pci_dev, id);
407 int __weak pcibios_alloc_irq(struct pci_dev *dev)
412 void __weak pcibios_free_irq(struct pci_dev *dev)
416 #ifdef CONFIG_PCI_IOV
417 static inline bool pci_device_can_probe(struct pci_dev *pdev)
419 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
420 pdev->driver_override);
423 static inline bool pci_device_can_probe(struct pci_dev *pdev)
429 static int pci_device_probe(struct device *dev)
432 struct pci_dev *pci_dev = to_pci_dev(dev);
433 struct pci_driver *drv = to_pci_driver(dev->driver);
435 if (!pci_device_can_probe(pci_dev))
438 pci_assign_irq(pci_dev);
440 error = pcibios_alloc_irq(pci_dev);
444 pci_dev_get(pci_dev);
445 error = __pci_device_probe(drv, pci_dev);
447 pcibios_free_irq(pci_dev);
448 pci_dev_put(pci_dev);
454 static void pci_device_remove(struct device *dev)
456 struct pci_dev *pci_dev = to_pci_dev(dev);
457 struct pci_driver *drv = to_pci_driver(dev->driver);
460 pm_runtime_get_sync(dev);
461 drv->remove(pci_dev);
462 pm_runtime_put_noidle(dev);
464 pcibios_free_irq(pci_dev);
465 pci_iov_remove(pci_dev);
467 /* Undo the runtime PM settings in local_pci_probe() */
468 pm_runtime_put_sync(dev);
471 * If the device is still on, set the power state as "unknown",
472 * since it might change by the next time we load the driver.
474 if (pci_dev->current_state == PCI_D0)
475 pci_dev->current_state = PCI_UNKNOWN;
478 * We would love to complain here if pci_dev->is_enabled is set, that
479 * the driver should have called pci_disable_device(), but the
480 * unfortunate fact is there are too many odd BIOS and bridge setups
481 * that don't like drivers doing that all of the time.
482 * Oh well, we can dream of sane hardware when we sleep, no matter how
483 * horrible the crap we have to deal with is when we are awake...
486 pci_dev_put(pci_dev);
489 static void pci_device_shutdown(struct device *dev)
491 struct pci_dev *pci_dev = to_pci_dev(dev);
492 struct pci_driver *drv = to_pci_driver(dev->driver);
494 pm_runtime_resume(dev);
496 if (drv && drv->shutdown)
497 drv->shutdown(pci_dev);
500 * If this is a kexec reboot, turn off Bus Master bit on the
501 * device to tell it to not continue to do DMA. Don't touch
502 * devices in D3cold or unknown states.
503 * If it is not a kexec reboot, firmware will hit the PCI
504 * devices with big hammer and stop their DMA any way.
506 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
507 pci_clear_master(pci_dev);
512 /* Auxiliary functions used for system resume and run-time resume. */
515 * pci_restore_standard_config - restore standard config registers of PCI device
516 * @pci_dev: PCI device to handle
518 static int pci_restore_standard_config(struct pci_dev *pci_dev)
520 pci_update_current_state(pci_dev, PCI_UNKNOWN);
522 if (pci_dev->current_state != PCI_D0) {
523 int error = pci_set_power_state(pci_dev, PCI_D0);
528 pci_restore_state(pci_dev);
529 pci_pme_restore(pci_dev);
533 static void pci_pm_default_resume(struct pci_dev *pci_dev)
535 pci_fixup_device(pci_fixup_resume, pci_dev);
536 pci_enable_wake(pci_dev, PCI_D0, false);
541 #ifdef CONFIG_PM_SLEEP
543 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
545 pci_power_up(pci_dev);
546 pci_update_current_state(pci_dev, PCI_D0);
547 pci_restore_state(pci_dev);
548 pci_pme_restore(pci_dev);
552 * Default "suspend" method for devices that have no driver provided suspend,
553 * or not even a driver at all (second part).
555 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
558 * mark its power state as "unknown", since we don't know if
559 * e.g. the BIOS will change its device state when we suspend.
561 if (pci_dev->current_state == PCI_D0)
562 pci_dev->current_state = PCI_UNKNOWN;
566 * Default "resume" method for devices that have no driver provided resume,
567 * or not even a driver at all (second part).
569 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
573 /* if the device was enabled before suspend, reenable */
574 retval = pci_reenable_device(pci_dev);
576 * if the device was busmaster before the suspend, make it busmaster
579 if (pci_dev->is_busmaster)
580 pci_set_master(pci_dev);
585 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
587 struct pci_dev *pci_dev = to_pci_dev(dev);
588 struct pci_driver *drv = to_pci_driver(dev->driver);
590 if (drv && drv->suspend) {
591 pci_power_t prev = pci_dev->current_state;
594 error = drv->suspend(pci_dev, state);
595 suspend_report_result(drv->suspend, error);
599 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
600 && pci_dev->current_state != PCI_UNKNOWN) {
601 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
602 "PCI PM: Device state not saved by %pS\n",
607 pci_fixup_device(pci_fixup_suspend, pci_dev);
612 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
614 struct pci_dev *pci_dev = to_pci_dev(dev);
616 if (!pci_dev->state_saved)
617 pci_save_state(pci_dev);
619 pci_pm_set_unknown_state(pci_dev);
621 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
626 static int pci_legacy_resume(struct device *dev)
628 struct pci_dev *pci_dev = to_pci_dev(dev);
629 struct pci_driver *drv = to_pci_driver(dev->driver);
631 pci_fixup_device(pci_fixup_resume, pci_dev);
633 return drv && drv->resume ?
634 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
637 /* Auxiliary functions used by the new power management framework */
639 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
641 /* Disable non-bridge devices without PM support */
642 if (!pci_has_subordinate(pci_dev))
643 pci_disable_enabled_device(pci_dev);
646 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
648 struct pci_driver *drv = to_pci_driver(pci_dev->dev.driver);
649 bool ret = drv && (drv->suspend || drv->resume);
652 * Legacy PM support is used by default, so warn if the new framework is
653 * supported as well. Drivers are supposed to support either the
654 * former, or the latter, but not both at the same time.
656 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
657 pci_dev->vendor, pci_dev->device);
662 /* New power management framework */
664 static int pci_pm_prepare(struct device *dev)
666 struct pci_dev *pci_dev = to_pci_dev(dev);
667 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
669 if (pm && pm->prepare) {
670 int error = pm->prepare(dev);
674 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
677 if (pci_dev_need_resume(pci_dev))
681 * The PME setting needs to be adjusted here in case the direct-complete
682 * optimization is used with respect to this device.
684 pci_dev_adjust_pme(pci_dev);
688 static void pci_pm_complete(struct device *dev)
690 struct pci_dev *pci_dev = to_pci_dev(dev);
692 pci_dev_complete_resume(pci_dev);
693 pm_generic_complete(dev);
695 /* Resume device if platform firmware has put it in reset-power-on */
696 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
697 pci_power_t pre_sleep_state = pci_dev->current_state;
699 pci_refresh_power_state(pci_dev);
701 * On platforms with ACPI this check may also trigger for
702 * devices sharing power resources if one of those power
703 * resources has been activated as a result of a change of the
704 * power state of another device sharing it. However, in that
705 * case it is also better to resume the device, in general.
707 if (pci_dev->current_state < pre_sleep_state)
708 pm_request_resume(dev);
712 #else /* !CONFIG_PM_SLEEP */
714 #define pci_pm_prepare NULL
715 #define pci_pm_complete NULL
717 #endif /* !CONFIG_PM_SLEEP */
719 #ifdef CONFIG_SUSPEND
720 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
723 * Some BIOSes forget to clear Root PME Status bits after system
724 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
725 * Clear those bits now just in case (shouldn't hurt).
727 if (pci_is_pcie(pci_dev) &&
728 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
729 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
730 pcie_clear_root_pme_status(pci_dev);
733 static int pci_pm_suspend(struct device *dev)
735 struct pci_dev *pci_dev = to_pci_dev(dev);
736 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
738 pci_dev->skip_bus_pm = false;
740 if (pci_has_legacy_pm_support(pci_dev))
741 return pci_legacy_suspend(dev, PMSG_SUSPEND);
744 pci_pm_default_suspend(pci_dev);
749 * PCI devices suspended at run time may need to be resumed at this
750 * point, because in general it may be necessary to reconfigure them for
751 * system suspend. Namely, if the device is expected to wake up the
752 * system from the sleep state, it may have to be reconfigured for this
753 * purpose, or if the device is not expected to wake up the system from
754 * the sleep state, it should be prevented from signaling wakeup events
757 * Also if the driver of the device does not indicate that its system
758 * suspend callbacks can cope with runtime-suspended devices, it is
759 * better to resume the device from runtime suspend here.
761 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
762 pci_dev_need_resume(pci_dev)) {
763 pm_runtime_resume(dev);
764 pci_dev->state_saved = false;
766 pci_dev_adjust_pme(pci_dev);
770 pci_power_t prev = pci_dev->current_state;
773 error = pm->suspend(dev);
774 suspend_report_result(pm->suspend, error);
778 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
779 && pci_dev->current_state != PCI_UNKNOWN) {
780 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
781 "PCI PM: State of device not saved by %pS\n",
789 static int pci_pm_suspend_late(struct device *dev)
791 if (dev_pm_skip_suspend(dev))
794 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
796 return pm_generic_suspend_late(dev);
799 static int pci_pm_suspend_noirq(struct device *dev)
801 struct pci_dev *pci_dev = to_pci_dev(dev);
802 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
804 if (dev_pm_skip_suspend(dev))
807 if (pci_has_legacy_pm_support(pci_dev))
808 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
811 pci_save_state(pci_dev);
815 if (pm->suspend_noirq) {
816 pci_power_t prev = pci_dev->current_state;
819 error = pm->suspend_noirq(dev);
820 suspend_report_result(pm->suspend_noirq, error);
824 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
825 && pci_dev->current_state != PCI_UNKNOWN) {
826 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
827 "PCI PM: State of device not saved by %pS\n",
833 if (pci_dev->skip_bus_pm) {
835 * Either the device is a bridge with a child in D0 below it, or
836 * the function is running for the second time in a row without
837 * going through full resume, which is possible only during
838 * suspend-to-idle in a spurious wakeup case. The device should
839 * be in D0 at this point, but if it is a bridge, it may be
840 * necessary to save its state.
842 if (!pci_dev->state_saved)
843 pci_save_state(pci_dev);
844 } else if (!pci_dev->state_saved) {
845 pci_save_state(pci_dev);
846 if (pci_power_manageable(pci_dev))
847 pci_prepare_to_sleep(pci_dev);
850 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
851 pci_power_name(pci_dev->current_state));
853 if (pci_dev->current_state == PCI_D0) {
854 pci_dev->skip_bus_pm = true;
856 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
857 * downstream device is in D0, so avoid changing the power state
858 * of the parent bridge by setting the skip_bus_pm flag for it.
860 if (pci_dev->bus->self)
861 pci_dev->bus->self->skip_bus_pm = true;
864 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
865 pci_dbg(pci_dev, "PCI PM: Skipped\n");
869 pci_pm_set_unknown_state(pci_dev);
872 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
873 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
874 * hasn't been quiesced and tries to turn it off. If the controller
875 * is already in D3, this can hang or cause memory corruption.
877 * Since the value of the COMMAND register doesn't matter once the
878 * device has been suspended, we can safely set it to 0 here.
880 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
881 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
884 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
887 * If the target system sleep state is suspend-to-idle, it is sufficient
888 * to check whether or not the device's wakeup settings are good for
889 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
890 * pci_pm_complete() to take care of fixing up the device's state
891 * anyway, if need be.
893 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
894 dev->power.may_skip_resume = false;
899 static int pci_pm_resume_noirq(struct device *dev)
901 struct pci_dev *pci_dev = to_pci_dev(dev);
902 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
903 pci_power_t prev_state = pci_dev->current_state;
904 bool skip_bus_pm = pci_dev->skip_bus_pm;
906 if (dev_pm_skip_resume(dev))
910 * In the suspend-to-idle case, devices left in D0 during suspend will
911 * stay in D0, so it is not necessary to restore or update their
912 * configuration here and attempting to put them into D0 again is
913 * pointless, so avoid doing that.
915 if (!(skip_bus_pm && pm_suspend_no_platform()))
916 pci_pm_default_resume_early(pci_dev);
918 pci_fixup_device(pci_fixup_resume_early, pci_dev);
919 pcie_pme_root_status_cleanup(pci_dev);
921 if (!skip_bus_pm && prev_state == PCI_D3cold)
922 pci_bridge_wait_for_secondary_bus(pci_dev);
924 if (pci_has_legacy_pm_support(pci_dev))
927 if (pm && pm->resume_noirq)
928 return pm->resume_noirq(dev);
933 static int pci_pm_resume_early(struct device *dev)
935 if (dev_pm_skip_resume(dev))
938 return pm_generic_resume_early(dev);
941 static int pci_pm_resume(struct device *dev)
943 struct pci_dev *pci_dev = to_pci_dev(dev);
944 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
947 * This is necessary for the suspend error path in which resume is
948 * called without restoring the standard config registers of the device.
950 if (pci_dev->state_saved)
951 pci_restore_standard_config(pci_dev);
953 if (pci_has_legacy_pm_support(pci_dev))
954 return pci_legacy_resume(dev);
956 pci_pm_default_resume(pci_dev);
960 return pm->resume(dev);
962 pci_pm_reenable_device(pci_dev);
968 #else /* !CONFIG_SUSPEND */
970 #define pci_pm_suspend NULL
971 #define pci_pm_suspend_late NULL
972 #define pci_pm_suspend_noirq NULL
973 #define pci_pm_resume NULL
974 #define pci_pm_resume_early NULL
975 #define pci_pm_resume_noirq NULL
977 #endif /* !CONFIG_SUSPEND */
979 #ifdef CONFIG_HIBERNATE_CALLBACKS
981 static int pci_pm_freeze(struct device *dev)
983 struct pci_dev *pci_dev = to_pci_dev(dev);
984 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
986 if (pci_has_legacy_pm_support(pci_dev))
987 return pci_legacy_suspend(dev, PMSG_FREEZE);
990 pci_pm_default_suspend(pci_dev);
995 * Resume all runtime-suspended devices before creating a snapshot
996 * image of system memory, because the restore kernel generally cannot
997 * be expected to always handle them consistently and they need to be
998 * put into the runtime-active metastate during system resume anyway,
999 * so it is better to ensure that the state saved in the image will be
1000 * always consistent with that.
1002 pm_runtime_resume(dev);
1003 pci_dev->state_saved = false;
1008 error = pm->freeze(dev);
1009 suspend_report_result(pm->freeze, error);
1017 static int pci_pm_freeze_noirq(struct device *dev)
1019 struct pci_dev *pci_dev = to_pci_dev(dev);
1020 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1022 if (pci_has_legacy_pm_support(pci_dev))
1023 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1025 if (pm && pm->freeze_noirq) {
1028 error = pm->freeze_noirq(dev);
1029 suspend_report_result(pm->freeze_noirq, error);
1034 if (!pci_dev->state_saved)
1035 pci_save_state(pci_dev);
1037 pci_pm_set_unknown_state(pci_dev);
1042 static int pci_pm_thaw_noirq(struct device *dev)
1044 struct pci_dev *pci_dev = to_pci_dev(dev);
1045 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1048 * The pm->thaw_noirq() callback assumes the device has been
1049 * returned to D0 and its config state has been restored.
1051 * In addition, pci_restore_state() restores MSI-X state in MMIO
1052 * space, which requires the device to be in D0, so return it to D0
1053 * in case the driver's "freeze" callbacks put it into a low-power
1056 pci_set_power_state(pci_dev, PCI_D0);
1057 pci_restore_state(pci_dev);
1059 if (pci_has_legacy_pm_support(pci_dev))
1062 if (pm && pm->thaw_noirq)
1063 return pm->thaw_noirq(dev);
1068 static int pci_pm_thaw(struct device *dev)
1070 struct pci_dev *pci_dev = to_pci_dev(dev);
1071 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1074 if (pci_has_legacy_pm_support(pci_dev))
1075 return pci_legacy_resume(dev);
1079 error = pm->thaw(dev);
1081 pci_pm_reenable_device(pci_dev);
1084 pci_dev->state_saved = false;
1089 static int pci_pm_poweroff(struct device *dev)
1091 struct pci_dev *pci_dev = to_pci_dev(dev);
1092 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1094 if (pci_has_legacy_pm_support(pci_dev))
1095 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1098 pci_pm_default_suspend(pci_dev);
1102 /* The reason to do that is the same as in pci_pm_suspend(). */
1103 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1104 pci_dev_need_resume(pci_dev)) {
1105 pm_runtime_resume(dev);
1106 pci_dev->state_saved = false;
1108 pci_dev_adjust_pme(pci_dev);
1114 error = pm->poweroff(dev);
1115 suspend_report_result(pm->poweroff, error);
1123 static int pci_pm_poweroff_late(struct device *dev)
1125 if (dev_pm_skip_suspend(dev))
1128 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1130 return pm_generic_poweroff_late(dev);
1133 static int pci_pm_poweroff_noirq(struct device *dev)
1135 struct pci_dev *pci_dev = to_pci_dev(dev);
1136 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1138 if (dev_pm_skip_suspend(dev))
1141 if (pci_has_legacy_pm_support(pci_dev))
1142 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1145 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1149 if (pm->poweroff_noirq) {
1152 error = pm->poweroff_noirq(dev);
1153 suspend_report_result(pm->poweroff_noirq, error);
1158 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1159 pci_prepare_to_sleep(pci_dev);
1162 * The reason for doing this here is the same as for the analogous code
1163 * in pci_pm_suspend_noirq().
1165 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1166 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1168 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1173 static int pci_pm_restore_noirq(struct device *dev)
1175 struct pci_dev *pci_dev = to_pci_dev(dev);
1176 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1178 pci_pm_default_resume_early(pci_dev);
1179 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1181 if (pci_has_legacy_pm_support(pci_dev))
1184 if (pm && pm->restore_noirq)
1185 return pm->restore_noirq(dev);
1190 static int pci_pm_restore(struct device *dev)
1192 struct pci_dev *pci_dev = to_pci_dev(dev);
1193 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1196 * This is necessary for the hibernation error path in which restore is
1197 * called without restoring the standard config registers of the device.
1199 if (pci_dev->state_saved)
1200 pci_restore_standard_config(pci_dev);
1202 if (pci_has_legacy_pm_support(pci_dev))
1203 return pci_legacy_resume(dev);
1205 pci_pm_default_resume(pci_dev);
1209 return pm->restore(dev);
1211 pci_pm_reenable_device(pci_dev);
1217 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1219 #define pci_pm_freeze NULL
1220 #define pci_pm_freeze_noirq NULL
1221 #define pci_pm_thaw NULL
1222 #define pci_pm_thaw_noirq NULL
1223 #define pci_pm_poweroff NULL
1224 #define pci_pm_poweroff_late NULL
1225 #define pci_pm_poweroff_noirq NULL
1226 #define pci_pm_restore NULL
1227 #define pci_pm_restore_noirq NULL
1229 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1233 static int pci_pm_runtime_suspend(struct device *dev)
1235 struct pci_dev *pci_dev = to_pci_dev(dev);
1236 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1237 pci_power_t prev = pci_dev->current_state;
1241 * If the device has no driver, we leave it in D0, but it may go to
1242 * D3cold when the bridge above it runtime suspends. Save its
1243 * config space in case that happens.
1245 if (!to_pci_driver(dev->driver)) {
1246 pci_save_state(pci_dev);
1250 pci_dev->state_saved = false;
1251 if (pm && pm->runtime_suspend) {
1252 error = pm->runtime_suspend(dev);
1254 * -EBUSY and -EAGAIN is used to request the runtime PM core
1255 * to schedule a new suspend, so log the event only with debug
1258 if (error == -EBUSY || error == -EAGAIN) {
1259 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1260 pm->runtime_suspend, error);
1263 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1264 pm->runtime_suspend, error);
1269 pci_fixup_device(pci_fixup_suspend, pci_dev);
1271 if (pm && pm->runtime_suspend
1272 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1273 && pci_dev->current_state != PCI_UNKNOWN) {
1274 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1275 "PCI PM: State of device not saved by %pS\n",
1276 pm->runtime_suspend);
1280 if (!pci_dev->state_saved) {
1281 pci_save_state(pci_dev);
1282 pci_finish_runtime_suspend(pci_dev);
1288 static int pci_pm_runtime_resume(struct device *dev)
1290 struct pci_dev *pci_dev = to_pci_dev(dev);
1291 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1292 pci_power_t prev_state = pci_dev->current_state;
1296 * Restoring config space is necessary even if the device is not bound
1297 * to a driver because although we left it in D0, it may have gone to
1298 * D3cold when the bridge above it runtime suspended.
1300 pci_restore_standard_config(pci_dev);
1302 if (!to_pci_driver(dev->driver))
1305 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1306 pci_pm_default_resume(pci_dev);
1308 if (prev_state == PCI_D3cold)
1309 pci_bridge_wait_for_secondary_bus(pci_dev);
1311 if (pm && pm->runtime_resume)
1312 error = pm->runtime_resume(dev);
1314 pci_dev->runtime_d3cold = false;
1319 static int pci_pm_runtime_idle(struct device *dev)
1321 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1324 * If the device has no driver, it should always remain in D0
1325 * regardless of the runtime PM status
1327 if (!to_pci_driver(dev->driver))
1333 if (pm->runtime_idle)
1334 return pm->runtime_idle(dev);
1339 static const struct dev_pm_ops pci_dev_pm_ops = {
1340 .prepare = pci_pm_prepare,
1341 .complete = pci_pm_complete,
1342 .suspend = pci_pm_suspend,
1343 .suspend_late = pci_pm_suspend_late,
1344 .resume = pci_pm_resume,
1345 .resume_early = pci_pm_resume_early,
1346 .freeze = pci_pm_freeze,
1347 .thaw = pci_pm_thaw,
1348 .poweroff = pci_pm_poweroff,
1349 .poweroff_late = pci_pm_poweroff_late,
1350 .restore = pci_pm_restore,
1351 .suspend_noirq = pci_pm_suspend_noirq,
1352 .resume_noirq = pci_pm_resume_noirq,
1353 .freeze_noirq = pci_pm_freeze_noirq,
1354 .thaw_noirq = pci_pm_thaw_noirq,
1355 .poweroff_noirq = pci_pm_poweroff_noirq,
1356 .restore_noirq = pci_pm_restore_noirq,
1357 .runtime_suspend = pci_pm_runtime_suspend,
1358 .runtime_resume = pci_pm_runtime_resume,
1359 .runtime_idle = pci_pm_runtime_idle,
1362 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1364 #else /* !CONFIG_PM */
1366 #define pci_pm_runtime_suspend NULL
1367 #define pci_pm_runtime_resume NULL
1368 #define pci_pm_runtime_idle NULL
1370 #define PCI_PM_OPS_PTR NULL
1372 #endif /* !CONFIG_PM */
1375 * __pci_register_driver - register a new pci driver
1376 * @drv: the driver structure to register
1377 * @owner: owner module of drv
1378 * @mod_name: module name string
1380 * Adds the driver structure to the list of registered drivers.
1381 * Returns a negative value on error, otherwise 0.
1382 * If no error occurred, the driver remains registered even if
1383 * no device was claimed during registration.
1385 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1386 const char *mod_name)
1388 /* initialize common driver fields */
1389 drv->driver.name = drv->name;
1390 drv->driver.bus = &pci_bus_type;
1391 drv->driver.owner = owner;
1392 drv->driver.mod_name = mod_name;
1393 drv->driver.groups = drv->groups;
1394 drv->driver.dev_groups = drv->dev_groups;
1396 spin_lock_init(&drv->dynids.lock);
1397 INIT_LIST_HEAD(&drv->dynids.list);
1399 /* register with core */
1400 return driver_register(&drv->driver);
1402 EXPORT_SYMBOL(__pci_register_driver);
1405 * pci_unregister_driver - unregister a pci driver
1406 * @drv: the driver structure to unregister
1408 * Deletes the driver structure from the list of registered PCI drivers,
1409 * gives it a chance to clean up by calling its remove() function for
1410 * each device it was responsible for, and marks those devices as
1414 void pci_unregister_driver(struct pci_driver *drv)
1416 driver_unregister(&drv->driver);
1417 pci_free_dynids(drv);
1419 EXPORT_SYMBOL(pci_unregister_driver);
1421 static struct pci_driver pci_compat_driver = {
1426 * pci_dev_driver - get the pci_driver of a device
1427 * @dev: the device to query
1429 * Returns the appropriate pci_driver structure or %NULL if there is no
1430 * registered driver for the device.
1432 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1434 struct pci_driver *drv = to_pci_driver(dev->dev.driver);
1440 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1441 if (dev->resource[i].flags & IORESOURCE_BUSY)
1442 return &pci_compat_driver;
1446 EXPORT_SYMBOL(pci_dev_driver);
1449 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1450 * @dev: the PCI device structure to match against
1451 * @drv: the device driver to search for matching PCI device id structures
1453 * Used by a driver to check whether a PCI device present in the
1454 * system is in its list of supported devices. Returns the matching
1455 * pci_device_id structure or %NULL if there is no match.
1457 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1459 struct pci_dev *pci_dev = to_pci_dev(dev);
1460 struct pci_driver *pci_drv;
1461 const struct pci_device_id *found_id;
1463 if (!pci_dev->match_driver)
1466 pci_drv = to_pci_driver(drv);
1467 found_id = pci_match_device(pci_drv, pci_dev);
1475 * pci_dev_get - increments the reference count of the pci device structure
1476 * @dev: the device being referenced
1478 * Each live reference to a device should be refcounted.
1480 * Drivers for PCI devices should normally record such references in
1481 * their probe() methods, when they bind to a device, and release
1482 * them by calling pci_dev_put(), in their disconnect() methods.
1484 * A pointer to the device with the incremented reference counter is returned.
1486 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1489 get_device(&dev->dev);
1492 EXPORT_SYMBOL(pci_dev_get);
1495 * pci_dev_put - release a use of the pci device structure
1496 * @dev: device that's been disconnected
1498 * Must be called when a user of a device is finished with it. When the last
1499 * user of the device calls this function, the memory of the device is freed.
1501 void pci_dev_put(struct pci_dev *dev)
1504 put_device(&dev->dev);
1506 EXPORT_SYMBOL(pci_dev_put);
1508 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1510 struct pci_dev *pdev;
1515 pdev = to_pci_dev(dev);
1517 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1520 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1523 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1524 pdev->subsystem_device))
1527 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1530 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1531 pdev->vendor, pdev->device,
1532 pdev->subsystem_vendor, pdev->subsystem_device,
1533 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1540 #if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
1542 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1543 * @pdev: PCI device undergoing error recovery
1544 * @err_type: type of error event
1546 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1552 case PCI_ERS_RESULT_NONE:
1553 case PCI_ERS_RESULT_CAN_RECOVER:
1554 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1555 envp[idx++] = "DEVICE_ONLINE=0";
1557 case PCI_ERS_RESULT_RECOVERED:
1558 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1559 envp[idx++] = "DEVICE_ONLINE=1";
1561 case PCI_ERS_RESULT_DISCONNECT:
1562 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1563 envp[idx++] = "DEVICE_ONLINE=0";
1571 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1576 static int pci_bus_num_vf(struct device *dev)
1578 return pci_num_vf(to_pci_dev(dev));
1582 * pci_dma_configure - Setup DMA configuration
1583 * @dev: ptr to dev structure
1585 * Function to update PCI devices's DMA configuration using the same
1586 * info from the OF node or ACPI node of host bridge's parent (if any).
1588 static int pci_dma_configure(struct device *dev)
1590 struct device *bridge;
1593 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1595 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1596 bridge->parent->of_node) {
1597 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1598 } else if (has_acpi_companion(bridge)) {
1599 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1601 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1604 pci_put_host_bridge_device(bridge);
1608 struct bus_type pci_bus_type = {
1610 .match = pci_bus_match,
1611 .uevent = pci_uevent,
1612 .probe = pci_device_probe,
1613 .remove = pci_device_remove,
1614 .shutdown = pci_device_shutdown,
1615 .dev_groups = pci_dev_groups,
1616 .bus_groups = pci_bus_groups,
1617 .drv_groups = pci_drv_groups,
1618 .pm = PCI_PM_OPS_PTR,
1619 .num_vf = pci_bus_num_vf,
1620 .dma_configure = pci_dma_configure,
1622 EXPORT_SYMBOL(pci_bus_type);
1624 #ifdef CONFIG_PCIEPORTBUS
1625 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1627 struct pcie_device *pciedev;
1628 struct pcie_port_service_driver *driver;
1630 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1633 pciedev = to_pcie_device(dev);
1634 driver = to_service_driver(drv);
1636 if (driver->service != pciedev->service)
1639 if (driver->port_type != PCIE_ANY_PORT &&
1640 driver->port_type != pci_pcie_type(pciedev->port))
1646 struct bus_type pcie_port_bus_type = {
1647 .name = "pci_express",
1648 .match = pcie_port_bus_match,
1650 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1653 static int __init pci_driver_init(void)
1657 ret = bus_register(&pci_bus_type);
1661 #ifdef CONFIG_PCIEPORTBUS
1662 ret = bus_register(&pcie_port_bus_type);
1666 dma_debug_add_bus(&pci_bus_type);
1669 postcore_initcall(pci_driver_init);