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>
23 #include <linux/iommu.h>
25 #include "pcie/portdrv.h"
28 struct list_head node;
29 struct pci_device_id id;
33 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
34 * @drv: target pci driver
35 * @vendor: PCI vendor ID
36 * @device: PCI device ID
37 * @subvendor: PCI subvendor ID
38 * @subdevice: PCI subdevice ID
40 * @class_mask: PCI class mask
41 * @driver_data: private driver data
43 * Adds a new dynamic pci device ID to this driver and causes the
44 * driver to probe for all devices again. @drv must have been
45 * registered prior to calling this function.
48 * Does GFP_KERNEL allocation.
51 * 0 on success, -errno on failure.
53 int pci_add_dynid(struct pci_driver *drv,
54 unsigned int vendor, unsigned int device,
55 unsigned int subvendor, unsigned int subdevice,
56 unsigned int class, unsigned int class_mask,
57 unsigned long driver_data)
59 struct pci_dynid *dynid;
61 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
65 dynid->id.vendor = vendor;
66 dynid->id.device = device;
67 dynid->id.subvendor = subvendor;
68 dynid->id.subdevice = subdevice;
69 dynid->id.class = class;
70 dynid->id.class_mask = class_mask;
71 dynid->id.driver_data = driver_data;
73 spin_lock(&drv->dynids.lock);
74 list_add_tail(&dynid->node, &drv->dynids.list);
75 spin_unlock(&drv->dynids.lock);
77 return driver_attach(&drv->driver);
79 EXPORT_SYMBOL_GPL(pci_add_dynid);
81 static void pci_free_dynids(struct pci_driver *drv)
83 struct pci_dynid *dynid, *n;
85 spin_lock(&drv->dynids.lock);
86 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 list_del(&dynid->node);
90 spin_unlock(&drv->dynids.lock);
94 * pci_match_id - See if a PCI device matches a given pci_id table
95 * @ids: array of PCI device ID structures to search in
96 * @dev: the PCI device structure to match against.
98 * Used by a driver to check whether a PCI device is in its list of
99 * supported devices. Returns the matching pci_device_id structure or
100 * %NULL if there is no match.
102 * Deprecated; don't use this as it will not catch any dynamic IDs
103 * that a driver might want to check for.
105 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
109 while (ids->vendor || ids->subvendor || ids->class_mask) {
110 if (pci_match_one_device(ids, dev))
117 EXPORT_SYMBOL(pci_match_id);
119 static const struct pci_device_id pci_device_id_any = {
120 .vendor = PCI_ANY_ID,
121 .device = PCI_ANY_ID,
122 .subvendor = PCI_ANY_ID,
123 .subdevice = PCI_ANY_ID,
127 * pci_match_device - See if a device matches a driver's list of IDs
128 * @drv: the PCI driver to match against
129 * @dev: the PCI device structure to match against
131 * Used by a driver to check whether a PCI device is in its list of
132 * supported devices or in the dynids list, which may have been augmented
133 * via the sysfs "new_id" file. Returns the matching pci_device_id
134 * structure or %NULL if there is no match.
136 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
139 struct pci_dynid *dynid;
140 const struct pci_device_id *found_id = NULL, *ids;
142 /* When driver_override is set, only bind to the matching driver */
143 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
146 /* Look at the dynamic ids first, before the static ones */
147 spin_lock(&drv->dynids.lock);
148 list_for_each_entry(dynid, &drv->dynids.list, node) {
149 if (pci_match_one_device(&dynid->id, dev)) {
150 found_id = &dynid->id;
154 spin_unlock(&drv->dynids.lock);
159 for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
160 ids = found_id + 1) {
162 * The match table is split based on driver_override.
163 * In case override_only was set, enforce driver_override
166 if (found_id->override_only) {
167 if (dev->driver_override)
174 /* driver_override will always match, send a dummy id */
175 if (dev->driver_override)
176 return &pci_device_id_any;
181 * new_id_store - sysfs frontend to pci_add_dynid()
182 * @driver: target device driver
183 * @buf: buffer for scanning device ID data
186 * Allow PCI IDs to be added to an existing driver via sysfs.
188 static ssize_t new_id_store(struct device_driver *driver, const char *buf,
191 struct pci_driver *pdrv = to_pci_driver(driver);
192 const struct pci_device_id *ids = pdrv->id_table;
193 u32 vendor, device, subvendor = PCI_ANY_ID,
194 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
195 unsigned long driver_data = 0;
199 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
200 &vendor, &device, &subvendor, &subdevice,
201 &class, &class_mask, &driver_data);
206 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
210 pdev->vendor = vendor;
211 pdev->device = device;
212 pdev->subsystem_vendor = subvendor;
213 pdev->subsystem_device = subdevice;
216 if (pci_match_device(pdrv, pdev))
225 /* Only accept driver_data values that match an existing id_table
229 while (ids->vendor || ids->subvendor || ids->class_mask) {
230 if (driver_data == ids->driver_data) {
236 if (retval) /* No match */
240 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
241 class, class_mask, driver_data);
246 static DRIVER_ATTR_WO(new_id);
249 * remove_id_store - remove a PCI device ID from this driver
250 * @driver: target device driver
251 * @buf: buffer for scanning device ID data
254 * Removes a dynamic pci device ID to this driver.
256 static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
259 struct pci_dynid *dynid, *n;
260 struct pci_driver *pdrv = to_pci_driver(driver);
261 u32 vendor, device, subvendor = PCI_ANY_ID,
262 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
264 size_t retval = -ENODEV;
266 fields = sscanf(buf, "%x %x %x %x %x %x",
267 &vendor, &device, &subvendor, &subdevice,
268 &class, &class_mask);
272 spin_lock(&pdrv->dynids.lock);
273 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
274 struct pci_device_id *id = &dynid->id;
275 if ((id->vendor == vendor) &&
276 (id->device == device) &&
277 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
278 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
279 !((id->class ^ class) & class_mask)) {
280 list_del(&dynid->node);
286 spin_unlock(&pdrv->dynids.lock);
290 static DRIVER_ATTR_WO(remove_id);
292 static struct attribute *pci_drv_attrs[] = {
293 &driver_attr_new_id.attr,
294 &driver_attr_remove_id.attr,
297 ATTRIBUTE_GROUPS(pci_drv);
299 struct drv_dev_and_id {
300 struct pci_driver *drv;
302 const struct pci_device_id *id;
305 static long local_pci_probe(void *_ddi)
307 struct drv_dev_and_id *ddi = _ddi;
308 struct pci_dev *pci_dev = ddi->dev;
309 struct pci_driver *pci_drv = ddi->drv;
310 struct device *dev = &pci_dev->dev;
314 * Unbound PCI devices are always put in D0, regardless of
315 * runtime PM status. During probe, the device is set to
316 * active and the usage count is incremented. If the driver
317 * supports runtime PM, it should call pm_runtime_put_noidle(),
318 * or any other runtime PM helper function decrementing the usage
319 * count, in its probe routine and pm_runtime_get_noresume() in
320 * its remove routine.
322 pm_runtime_get_sync(dev);
323 pci_dev->driver = pci_drv;
324 rc = pci_drv->probe(pci_dev, ddi->id);
328 pci_dev->driver = NULL;
329 pm_runtime_put_sync(dev);
333 * Probe function should return < 0 for failure, 0 for success
334 * Treat values > 0 as success, but warn.
336 pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
341 static bool pci_physfn_is_probed(struct pci_dev *dev)
343 #ifdef CONFIG_PCI_IOV
344 return dev->is_virtfn && dev->physfn->is_probed;
350 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
351 const struct pci_device_id *id)
353 int error, node, cpu;
354 struct drv_dev_and_id ddi = { drv, dev, id };
357 * Execute driver initialization on node where the device is
358 * attached. This way the driver likely allocates its local memory
361 node = dev_to_node(&dev->dev);
364 cpu_hotplug_disable();
367 * Prevent nesting work_on_cpu() for the case where a Virtual Function
368 * device is probed from work_on_cpu() of the Physical device.
370 if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
371 pci_physfn_is_probed(dev)) {
374 cpumask_var_t wq_domain_mask;
376 if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
380 cpumask_and(wq_domain_mask,
381 housekeeping_cpumask(HK_TYPE_WQ),
382 housekeeping_cpumask(HK_TYPE_DOMAIN));
384 cpu = cpumask_any_and(cpumask_of_node(node),
386 free_cpumask_var(wq_domain_mask);
389 if (cpu < nr_cpu_ids)
390 error = work_on_cpu(cpu, local_pci_probe, &ddi);
392 error = local_pci_probe(&ddi);
395 cpu_hotplug_enable();
400 * __pci_device_probe - check if a driver wants to claim a specific PCI device
401 * @drv: driver to call to check if it wants the PCI device
402 * @pci_dev: PCI device being probed
404 * returns 0 on success, else error.
405 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
407 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
409 const struct pci_device_id *id;
415 id = pci_match_device(drv, pci_dev);
417 error = pci_call_probe(drv, pci_dev, id);
422 int __weak pcibios_alloc_irq(struct pci_dev *dev)
427 void __weak pcibios_free_irq(struct pci_dev *dev)
431 #ifdef CONFIG_PCI_IOV
432 static inline bool pci_device_can_probe(struct pci_dev *pdev)
434 return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
435 pdev->driver_override);
438 static inline bool pci_device_can_probe(struct pci_dev *pdev)
444 static int pci_device_probe(struct device *dev)
447 struct pci_dev *pci_dev = to_pci_dev(dev);
448 struct pci_driver *drv = to_pci_driver(dev->driver);
450 if (!pci_device_can_probe(pci_dev))
453 pci_assign_irq(pci_dev);
455 error = pcibios_alloc_irq(pci_dev);
459 pci_dev_get(pci_dev);
460 error = __pci_device_probe(drv, pci_dev);
462 pcibios_free_irq(pci_dev);
463 pci_dev_put(pci_dev);
469 static void pci_device_remove(struct device *dev)
471 struct pci_dev *pci_dev = to_pci_dev(dev);
472 struct pci_driver *drv = pci_dev->driver;
475 pm_runtime_get_sync(dev);
477 * If the driver provides a .runtime_idle() callback and it has
478 * started to run already, it may continue to run in parallel
479 * with the code below, so wait until all of the runtime PM
480 * activity has completed.
482 pm_runtime_barrier(dev);
483 drv->remove(pci_dev);
484 pm_runtime_put_noidle(dev);
486 pcibios_free_irq(pci_dev);
487 pci_dev->driver = NULL;
488 pci_iov_remove(pci_dev);
490 /* Undo the runtime PM settings in local_pci_probe() */
491 pm_runtime_put_sync(dev);
494 * If the device is still on, set the power state as "unknown",
495 * since it might change by the next time we load the driver.
497 if (pci_dev->current_state == PCI_D0)
498 pci_dev->current_state = PCI_UNKNOWN;
501 * We would love to complain here if pci_dev->is_enabled is set, that
502 * the driver should have called pci_disable_device(), but the
503 * unfortunate fact is there are too many odd BIOS and bridge setups
504 * that don't like drivers doing that all of the time.
505 * Oh well, we can dream of sane hardware when we sleep, no matter how
506 * horrible the crap we have to deal with is when we are awake...
509 pci_dev_put(pci_dev);
512 static void pci_device_shutdown(struct device *dev)
514 struct pci_dev *pci_dev = to_pci_dev(dev);
515 struct pci_driver *drv = pci_dev->driver;
517 pm_runtime_resume(dev);
519 if (drv && drv->shutdown)
520 drv->shutdown(pci_dev);
523 * If this is a kexec reboot, turn off Bus Master bit on the
524 * device to tell it to not continue to do DMA. Don't touch
525 * devices in D3cold or unknown states.
526 * If it is not a kexec reboot, firmware will hit the PCI
527 * devices with big hammer and stop their DMA any way.
529 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
530 pci_clear_master(pci_dev);
533 #ifdef CONFIG_PM_SLEEP
535 /* Auxiliary functions used for system resume */
538 * pci_restore_standard_config - restore standard config registers of PCI device
539 * @pci_dev: PCI device to handle
541 static int pci_restore_standard_config(struct pci_dev *pci_dev)
543 pci_update_current_state(pci_dev, PCI_UNKNOWN);
545 if (pci_dev->current_state != PCI_D0) {
546 int error = pci_set_power_state(pci_dev, PCI_D0);
551 pci_restore_state(pci_dev);
552 pci_pme_restore(pci_dev);
555 #endif /* CONFIG_PM_SLEEP */
559 /* Auxiliary functions used for system resume and run-time resume */
561 static void pci_pm_default_resume(struct pci_dev *pci_dev)
563 pci_fixup_device(pci_fixup_resume, pci_dev);
564 pci_enable_wake(pci_dev, PCI_D0, false);
567 static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev)
569 pci_power_up(pci_dev);
570 pci_update_current_state(pci_dev, PCI_D0);
573 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
575 pci_pm_power_up_and_verify_state(pci_dev);
576 pci_restore_state(pci_dev);
577 pci_pme_restore(pci_dev);
580 static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev)
582 pci_bridge_wait_for_secondary_bus(pci_dev, "resume", PCI_RESET_WAIT);
584 * When powering on a bridge from D3cold, the whole hierarchy may be
585 * powered on into D0uninitialized state, resume them to give them a
586 * chance to suspend again
588 pci_resume_bus(pci_dev->subordinate);
591 #endif /* CONFIG_PM */
593 #ifdef CONFIG_PM_SLEEP
596 * Default "suspend" method for devices that have no driver provided suspend,
597 * or not even a driver at all (second part).
599 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
602 * mark its power state as "unknown", since we don't know if
603 * e.g. the BIOS will change its device state when we suspend.
605 if (pci_dev->current_state == PCI_D0)
606 pci_dev->current_state = PCI_UNKNOWN;
610 * Default "resume" method for devices that have no driver provided resume,
611 * or not even a driver at all (second part).
613 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
617 /* if the device was enabled before suspend, re-enable */
618 retval = pci_reenable_device(pci_dev);
620 * if the device was busmaster before the suspend, make it busmaster
623 if (pci_dev->is_busmaster)
624 pci_set_master(pci_dev);
629 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
631 struct pci_dev *pci_dev = to_pci_dev(dev);
632 struct pci_driver *drv = pci_dev->driver;
634 if (drv && drv->suspend) {
635 pci_power_t prev = pci_dev->current_state;
638 error = drv->suspend(pci_dev, state);
639 suspend_report_result(dev, drv->suspend, error);
643 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
644 && pci_dev->current_state != PCI_UNKNOWN) {
645 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
646 "PCI PM: Device state not saved by %pS\n",
651 pci_fixup_device(pci_fixup_suspend, pci_dev);
656 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
658 struct pci_dev *pci_dev = to_pci_dev(dev);
660 if (!pci_dev->state_saved)
661 pci_save_state(pci_dev);
663 pci_pm_set_unknown_state(pci_dev);
665 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
670 static int pci_legacy_resume(struct device *dev)
672 struct pci_dev *pci_dev = to_pci_dev(dev);
673 struct pci_driver *drv = pci_dev->driver;
675 pci_fixup_device(pci_fixup_resume, pci_dev);
677 return drv && drv->resume ?
678 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
681 /* Auxiliary functions used by the new power management framework */
683 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
685 /* Disable non-bridge devices without PM support */
686 if (!pci_has_subordinate(pci_dev))
687 pci_disable_enabled_device(pci_dev);
690 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
692 struct pci_driver *drv = pci_dev->driver;
693 bool ret = drv && (drv->suspend || drv->resume);
696 * Legacy PM support is used by default, so warn if the new framework is
697 * supported as well. Drivers are supposed to support either the
698 * former, or the latter, but not both at the same time.
700 pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
701 pci_dev->vendor, pci_dev->device);
706 /* New power management framework */
708 static int pci_pm_prepare(struct device *dev)
710 struct pci_dev *pci_dev = to_pci_dev(dev);
711 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
713 if (pm && pm->prepare) {
714 int error = pm->prepare(dev);
718 if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
721 if (pci_dev_need_resume(pci_dev))
725 * The PME setting needs to be adjusted here in case the direct-complete
726 * optimization is used with respect to this device.
728 pci_dev_adjust_pme(pci_dev);
732 static void pci_pm_complete(struct device *dev)
734 struct pci_dev *pci_dev = to_pci_dev(dev);
736 pci_dev_complete_resume(pci_dev);
737 pm_generic_complete(dev);
739 /* Resume device if platform firmware has put it in reset-power-on */
740 if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
741 pci_power_t pre_sleep_state = pci_dev->current_state;
743 pci_refresh_power_state(pci_dev);
745 * On platforms with ACPI this check may also trigger for
746 * devices sharing power resources if one of those power
747 * resources has been activated as a result of a change of the
748 * power state of another device sharing it. However, in that
749 * case it is also better to resume the device, in general.
751 if (pci_dev->current_state < pre_sleep_state)
752 pm_request_resume(dev);
756 #else /* !CONFIG_PM_SLEEP */
758 #define pci_pm_prepare NULL
759 #define pci_pm_complete NULL
761 #endif /* !CONFIG_PM_SLEEP */
763 #ifdef CONFIG_SUSPEND
764 static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
767 * Some BIOSes forget to clear Root PME Status bits after system
768 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
769 * Clear those bits now just in case (shouldn't hurt).
771 if (pci_is_pcie(pci_dev) &&
772 (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
773 pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
774 pcie_clear_root_pme_status(pci_dev);
777 static int pci_pm_suspend(struct device *dev)
779 struct pci_dev *pci_dev = to_pci_dev(dev);
780 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
782 pci_dev->skip_bus_pm = false;
785 * Disabling PTM allows some systems, e.g., Intel mobile chips
786 * since Coffee Lake, to enter a lower-power PM state.
788 pci_suspend_ptm(pci_dev);
790 if (pci_has_legacy_pm_support(pci_dev))
791 return pci_legacy_suspend(dev, PMSG_SUSPEND);
794 pci_pm_default_suspend(pci_dev);
799 * PCI devices suspended at run time may need to be resumed at this
800 * point, because in general it may be necessary to reconfigure them for
801 * system suspend. Namely, if the device is expected to wake up the
802 * system from the sleep state, it may have to be reconfigured for this
803 * purpose, or if the device is not expected to wake up the system from
804 * the sleep state, it should be prevented from signaling wakeup events
807 * Also if the driver of the device does not indicate that its system
808 * suspend callbacks can cope with runtime-suspended devices, it is
809 * better to resume the device from runtime suspend here.
811 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
812 pci_dev_need_resume(pci_dev)) {
813 pm_runtime_resume(dev);
814 pci_dev->state_saved = false;
816 pci_dev_adjust_pme(pci_dev);
820 pci_power_t prev = pci_dev->current_state;
823 error = pm->suspend(dev);
824 suspend_report_result(dev, pm->suspend, 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",
839 static int pci_pm_suspend_late(struct device *dev)
841 if (dev_pm_skip_suspend(dev))
844 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
846 return pm_generic_suspend_late(dev);
849 static int pci_pm_suspend_noirq(struct device *dev)
851 struct pci_dev *pci_dev = to_pci_dev(dev);
852 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
854 if (dev_pm_skip_suspend(dev))
857 if (pci_has_legacy_pm_support(pci_dev))
858 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
861 pci_save_state(pci_dev);
865 if (pm->suspend_noirq) {
866 pci_power_t prev = pci_dev->current_state;
869 error = pm->suspend_noirq(dev);
870 suspend_report_result(dev, pm->suspend_noirq, error);
874 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
875 && pci_dev->current_state != PCI_UNKNOWN) {
876 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
877 "PCI PM: State of device not saved by %pS\n",
883 if (!pci_dev->state_saved) {
884 pci_save_state(pci_dev);
887 * If the device is a bridge with a child in D0 below it,
888 * it needs to stay in D0, so check skip_bus_pm to avoid
889 * putting it into a low-power state in that case.
891 if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
892 pci_prepare_to_sleep(pci_dev);
895 pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
896 pci_power_name(pci_dev->current_state));
898 if (pci_dev->current_state == PCI_D0) {
899 pci_dev->skip_bus_pm = true;
901 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
902 * downstream device is in D0, so avoid changing the power state
903 * of the parent bridge by setting the skip_bus_pm flag for it.
905 if (pci_dev->bus->self)
906 pci_dev->bus->self->skip_bus_pm = true;
909 if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
910 pci_dbg(pci_dev, "PCI PM: Skipped\n");
914 pci_pm_set_unknown_state(pci_dev);
917 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
918 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
919 * hasn't been quiesced and tries to turn it off. If the controller
920 * is already in D3, this can hang or cause memory corruption.
922 * Since the value of the COMMAND register doesn't matter once the
923 * device has been suspended, we can safely set it to 0 here.
925 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
926 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
929 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
932 * If the target system sleep state is suspend-to-idle, it is sufficient
933 * to check whether or not the device's wakeup settings are good for
934 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
935 * pci_pm_complete() to take care of fixing up the device's state
936 * anyway, if need be.
938 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
939 dev->power.may_skip_resume = false;
944 static int pci_pm_resume_noirq(struct device *dev)
946 struct pci_dev *pci_dev = to_pci_dev(dev);
947 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
948 pci_power_t prev_state = pci_dev->current_state;
949 bool skip_bus_pm = pci_dev->skip_bus_pm;
951 if (dev_pm_skip_resume(dev))
955 * In the suspend-to-idle case, devices left in D0 during suspend will
956 * stay in D0, so it is not necessary to restore or update their
957 * configuration here and attempting to put them into D0 again is
958 * pointless, so avoid doing that.
960 if (!(skip_bus_pm && pm_suspend_no_platform()))
961 pci_pm_default_resume_early(pci_dev);
963 pci_fixup_device(pci_fixup_resume_early, pci_dev);
964 pcie_pme_root_status_cleanup(pci_dev);
966 if (!skip_bus_pm && prev_state == PCI_D3cold)
967 pci_pm_bridge_power_up_actions(pci_dev);
969 if (pci_has_legacy_pm_support(pci_dev))
972 if (pm && pm->resume_noirq)
973 return pm->resume_noirq(dev);
978 static int pci_pm_resume_early(struct device *dev)
980 if (dev_pm_skip_resume(dev))
983 return pm_generic_resume_early(dev);
986 static int pci_pm_resume(struct device *dev)
988 struct pci_dev *pci_dev = to_pci_dev(dev);
989 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
992 * This is necessary for the suspend error path in which resume is
993 * called without restoring the standard config registers of the device.
995 if (pci_dev->state_saved)
996 pci_restore_standard_config(pci_dev);
998 pci_resume_ptm(pci_dev);
1000 if (pci_has_legacy_pm_support(pci_dev))
1001 return pci_legacy_resume(dev);
1003 pci_pm_default_resume(pci_dev);
1007 return pm->resume(dev);
1009 pci_pm_reenable_device(pci_dev);
1015 #else /* !CONFIG_SUSPEND */
1017 #define pci_pm_suspend NULL
1018 #define pci_pm_suspend_late NULL
1019 #define pci_pm_suspend_noirq NULL
1020 #define pci_pm_resume NULL
1021 #define pci_pm_resume_early NULL
1022 #define pci_pm_resume_noirq NULL
1024 #endif /* !CONFIG_SUSPEND */
1026 #ifdef CONFIG_HIBERNATE_CALLBACKS
1028 static int pci_pm_freeze(struct device *dev)
1030 struct pci_dev *pci_dev = to_pci_dev(dev);
1031 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1033 if (pci_has_legacy_pm_support(pci_dev))
1034 return pci_legacy_suspend(dev, PMSG_FREEZE);
1037 pci_pm_default_suspend(pci_dev);
1042 * Resume all runtime-suspended devices before creating a snapshot
1043 * image of system memory, because the restore kernel generally cannot
1044 * be expected to always handle them consistently and they need to be
1045 * put into the runtime-active metastate during system resume anyway,
1046 * so it is better to ensure that the state saved in the image will be
1047 * always consistent with that.
1049 pm_runtime_resume(dev);
1050 pci_dev->state_saved = false;
1055 error = pm->freeze(dev);
1056 suspend_report_result(dev, pm->freeze, error);
1064 static int pci_pm_freeze_noirq(struct device *dev)
1066 struct pci_dev *pci_dev = to_pci_dev(dev);
1067 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1069 if (pci_has_legacy_pm_support(pci_dev))
1070 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
1072 if (pm && pm->freeze_noirq) {
1075 error = pm->freeze_noirq(dev);
1076 suspend_report_result(dev, pm->freeze_noirq, error);
1081 if (!pci_dev->state_saved)
1082 pci_save_state(pci_dev);
1084 pci_pm_set_unknown_state(pci_dev);
1089 static int pci_pm_thaw_noirq(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;
1095 * The pm->thaw_noirq() callback assumes the device has been
1096 * returned to D0 and its config state has been restored.
1098 * In addition, pci_restore_state() restores MSI-X state in MMIO
1099 * space, which requires the device to be in D0, so return it to D0
1100 * in case the driver's "freeze" callbacks put it into a low-power
1103 pci_pm_power_up_and_verify_state(pci_dev);
1104 pci_restore_state(pci_dev);
1106 if (pci_has_legacy_pm_support(pci_dev))
1109 if (pm && pm->thaw_noirq)
1110 return pm->thaw_noirq(dev);
1115 static int pci_pm_thaw(struct device *dev)
1117 struct pci_dev *pci_dev = to_pci_dev(dev);
1118 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1121 if (pci_has_legacy_pm_support(pci_dev))
1122 return pci_legacy_resume(dev);
1126 error = pm->thaw(dev);
1128 pci_pm_reenable_device(pci_dev);
1131 pci_dev->state_saved = false;
1136 static int pci_pm_poweroff(struct device *dev)
1138 struct pci_dev *pci_dev = to_pci_dev(dev);
1139 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1141 if (pci_has_legacy_pm_support(pci_dev))
1142 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1145 pci_pm_default_suspend(pci_dev);
1149 /* The reason to do that is the same as in pci_pm_suspend(). */
1150 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1151 pci_dev_need_resume(pci_dev)) {
1152 pm_runtime_resume(dev);
1153 pci_dev->state_saved = false;
1155 pci_dev_adjust_pme(pci_dev);
1161 error = pm->poweroff(dev);
1162 suspend_report_result(dev, pm->poweroff, error);
1170 static int pci_pm_poweroff_late(struct device *dev)
1172 if (dev_pm_skip_suspend(dev))
1175 pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1177 return pm_generic_poweroff_late(dev);
1180 static int pci_pm_poweroff_noirq(struct device *dev)
1182 struct pci_dev *pci_dev = to_pci_dev(dev);
1183 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1185 if (dev_pm_skip_suspend(dev))
1188 if (pci_has_legacy_pm_support(pci_dev))
1189 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1192 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1196 if (pm->poweroff_noirq) {
1199 error = pm->poweroff_noirq(dev);
1200 suspend_report_result(dev, pm->poweroff_noirq, error);
1205 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1206 pci_prepare_to_sleep(pci_dev);
1209 * The reason for doing this here is the same as for the analogous code
1210 * in pci_pm_suspend_noirq().
1212 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1213 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1215 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1220 static int pci_pm_restore_noirq(struct device *dev)
1222 struct pci_dev *pci_dev = to_pci_dev(dev);
1223 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1225 pci_pm_default_resume_early(pci_dev);
1226 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1228 if (pci_has_legacy_pm_support(pci_dev))
1231 if (pm && pm->restore_noirq)
1232 return pm->restore_noirq(dev);
1237 static int pci_pm_restore(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;
1243 * This is necessary for the hibernation error path in which restore is
1244 * called without restoring the standard config registers of the device.
1246 if (pci_dev->state_saved)
1247 pci_restore_standard_config(pci_dev);
1249 if (pci_has_legacy_pm_support(pci_dev))
1250 return pci_legacy_resume(dev);
1252 pci_pm_default_resume(pci_dev);
1256 return pm->restore(dev);
1258 pci_pm_reenable_device(pci_dev);
1264 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1266 #define pci_pm_freeze NULL
1267 #define pci_pm_freeze_noirq NULL
1268 #define pci_pm_thaw NULL
1269 #define pci_pm_thaw_noirq NULL
1270 #define pci_pm_poweroff NULL
1271 #define pci_pm_poweroff_late NULL
1272 #define pci_pm_poweroff_noirq NULL
1273 #define pci_pm_restore NULL
1274 #define pci_pm_restore_noirq NULL
1276 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1280 static int pci_pm_runtime_suspend(struct device *dev)
1282 struct pci_dev *pci_dev = to_pci_dev(dev);
1283 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1284 pci_power_t prev = pci_dev->current_state;
1287 pci_suspend_ptm(pci_dev);
1290 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1291 * but it may go to D3cold when the bridge above it runtime suspends.
1292 * Save its config space in case that happens.
1294 if (!pci_dev->driver) {
1295 pci_save_state(pci_dev);
1299 pci_dev->state_saved = false;
1300 if (pm && pm->runtime_suspend) {
1301 error = pm->runtime_suspend(dev);
1303 * -EBUSY and -EAGAIN is used to request the runtime PM core
1304 * to schedule a new suspend, so log the event only with debug
1307 if (error == -EBUSY || error == -EAGAIN) {
1308 pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1309 pm->runtime_suspend, error);
1312 pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1313 pm->runtime_suspend, error);
1318 pci_fixup_device(pci_fixup_suspend, pci_dev);
1320 if (pm && pm->runtime_suspend
1321 && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1322 && pci_dev->current_state != PCI_UNKNOWN) {
1323 pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1324 "PCI PM: State of device not saved by %pS\n",
1325 pm->runtime_suspend);
1329 if (!pci_dev->state_saved) {
1330 pci_save_state(pci_dev);
1331 pci_finish_runtime_suspend(pci_dev);
1337 static int pci_pm_runtime_resume(struct device *dev)
1339 struct pci_dev *pci_dev = to_pci_dev(dev);
1340 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1341 pci_power_t prev_state = pci_dev->current_state;
1345 * Restoring config space is necessary even if the device is not bound
1346 * to a driver because although we left it in D0, it may have gone to
1347 * D3cold when the bridge above it runtime suspended.
1349 pci_pm_default_resume_early(pci_dev);
1350 pci_resume_ptm(pci_dev);
1352 if (!pci_dev->driver)
1355 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1356 pci_pm_default_resume(pci_dev);
1358 if (prev_state == PCI_D3cold)
1359 pci_pm_bridge_power_up_actions(pci_dev);
1361 if (pm && pm->runtime_resume)
1362 error = pm->runtime_resume(dev);
1367 static int pci_pm_runtime_idle(struct device *dev)
1369 struct pci_dev *pci_dev = to_pci_dev(dev);
1370 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1373 * If pci_dev->driver is not set (unbound), the device should
1374 * always remain in D0 regardless of the runtime PM status
1376 if (!pci_dev->driver)
1382 if (pm->runtime_idle)
1383 return pm->runtime_idle(dev);
1388 static const struct dev_pm_ops pci_dev_pm_ops = {
1389 .prepare = pci_pm_prepare,
1390 .complete = pci_pm_complete,
1391 .suspend = pci_pm_suspend,
1392 .suspend_late = pci_pm_suspend_late,
1393 .resume = pci_pm_resume,
1394 .resume_early = pci_pm_resume_early,
1395 .freeze = pci_pm_freeze,
1396 .thaw = pci_pm_thaw,
1397 .poweroff = pci_pm_poweroff,
1398 .poweroff_late = pci_pm_poweroff_late,
1399 .restore = pci_pm_restore,
1400 .suspend_noirq = pci_pm_suspend_noirq,
1401 .resume_noirq = pci_pm_resume_noirq,
1402 .freeze_noirq = pci_pm_freeze_noirq,
1403 .thaw_noirq = pci_pm_thaw_noirq,
1404 .poweroff_noirq = pci_pm_poweroff_noirq,
1405 .restore_noirq = pci_pm_restore_noirq,
1406 .runtime_suspend = pci_pm_runtime_suspend,
1407 .runtime_resume = pci_pm_runtime_resume,
1408 .runtime_idle = pci_pm_runtime_idle,
1411 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1413 #else /* !CONFIG_PM */
1415 #define pci_pm_runtime_suspend NULL
1416 #define pci_pm_runtime_resume NULL
1417 #define pci_pm_runtime_idle NULL
1419 #define PCI_PM_OPS_PTR NULL
1421 #endif /* !CONFIG_PM */
1424 * __pci_register_driver - register a new pci driver
1425 * @drv: the driver structure to register
1426 * @owner: owner module of drv
1427 * @mod_name: module name string
1429 * Adds the driver structure to the list of registered drivers.
1430 * Returns a negative value on error, otherwise 0.
1431 * If no error occurred, the driver remains registered even if
1432 * no device was claimed during registration.
1434 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1435 const char *mod_name)
1437 /* initialize common driver fields */
1438 drv->driver.name = drv->name;
1439 drv->driver.bus = &pci_bus_type;
1440 drv->driver.owner = owner;
1441 drv->driver.mod_name = mod_name;
1442 drv->driver.groups = drv->groups;
1443 drv->driver.dev_groups = drv->dev_groups;
1445 spin_lock_init(&drv->dynids.lock);
1446 INIT_LIST_HEAD(&drv->dynids.list);
1448 /* register with core */
1449 return driver_register(&drv->driver);
1451 EXPORT_SYMBOL(__pci_register_driver);
1454 * pci_unregister_driver - unregister a pci driver
1455 * @drv: the driver structure to unregister
1457 * Deletes the driver structure from the list of registered PCI drivers,
1458 * gives it a chance to clean up by calling its remove() function for
1459 * each device it was responsible for, and marks those devices as
1463 void pci_unregister_driver(struct pci_driver *drv)
1465 driver_unregister(&drv->driver);
1466 pci_free_dynids(drv);
1468 EXPORT_SYMBOL(pci_unregister_driver);
1470 static struct pci_driver pci_compat_driver = {
1475 * pci_dev_driver - get the pci_driver of a device
1476 * @dev: the device to query
1478 * Returns the appropriate pci_driver structure or %NULL if there is no
1479 * registered driver for the device.
1481 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1487 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1488 if (dev->resource[i].flags & IORESOURCE_BUSY)
1489 return &pci_compat_driver;
1493 EXPORT_SYMBOL(pci_dev_driver);
1496 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1497 * @dev: the PCI device structure to match against
1498 * @drv: the device driver to search for matching PCI device id structures
1500 * Used by a driver to check whether a PCI device present in the
1501 * system is in its list of supported devices. Returns the matching
1502 * pci_device_id structure or %NULL if there is no match.
1504 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1506 struct pci_dev *pci_dev = to_pci_dev(dev);
1507 struct pci_driver *pci_drv;
1508 const struct pci_device_id *found_id;
1510 if (!pci_dev->match_driver)
1513 pci_drv = to_pci_driver(drv);
1514 found_id = pci_match_device(pci_drv, pci_dev);
1522 * pci_dev_get - increments the reference count of the pci device structure
1523 * @dev: the device being referenced
1525 * Each live reference to a device should be refcounted.
1527 * Drivers for PCI devices should normally record such references in
1528 * their probe() methods, when they bind to a device, and release
1529 * them by calling pci_dev_put(), in their disconnect() methods.
1531 * A pointer to the device with the incremented reference counter is returned.
1533 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1536 get_device(&dev->dev);
1539 EXPORT_SYMBOL(pci_dev_get);
1542 * pci_dev_put - release a use of the pci device structure
1543 * @dev: device that's been disconnected
1545 * Must be called when a user of a device is finished with it. When the last
1546 * user of the device calls this function, the memory of the device is freed.
1548 void pci_dev_put(struct pci_dev *dev)
1551 put_device(&dev->dev);
1553 EXPORT_SYMBOL(pci_dev_put);
1555 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1557 struct pci_dev *pdev;
1562 pdev = to_pci_dev(dev);
1564 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1567 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1570 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1571 pdev->subsystem_device))
1574 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1577 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1578 pdev->vendor, pdev->device,
1579 pdev->subsystem_vendor, pdev->subsystem_device,
1580 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1587 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1589 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1590 * @pdev: PCI device undergoing error recovery
1591 * @err_type: type of error event
1593 void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1599 case PCI_ERS_RESULT_NONE:
1600 case PCI_ERS_RESULT_CAN_RECOVER:
1601 envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1602 envp[idx++] = "DEVICE_ONLINE=0";
1604 case PCI_ERS_RESULT_RECOVERED:
1605 envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1606 envp[idx++] = "DEVICE_ONLINE=1";
1608 case PCI_ERS_RESULT_DISCONNECT:
1609 envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1610 envp[idx++] = "DEVICE_ONLINE=0";
1618 kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1623 static int pci_bus_num_vf(struct device *dev)
1625 return pci_num_vf(to_pci_dev(dev));
1629 * pci_dma_configure - Setup DMA configuration
1630 * @dev: ptr to dev structure
1632 * Function to update PCI devices's DMA configuration using the same
1633 * info from the OF node or ACPI node of host bridge's parent (if any).
1635 static int pci_dma_configure(struct device *dev)
1637 struct pci_driver *driver = to_pci_driver(dev->driver);
1638 struct device *bridge;
1641 bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1643 if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1644 bridge->parent->of_node) {
1645 ret = of_dma_configure(dev, bridge->parent->of_node, true);
1646 } else if (has_acpi_companion(bridge)) {
1647 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1649 ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1652 pci_put_host_bridge_device(bridge);
1654 if (!ret && !driver->driver_managed_dma) {
1655 ret = iommu_device_use_default_domain(dev);
1657 arch_teardown_dma_ops(dev);
1663 static void pci_dma_cleanup(struct device *dev)
1665 struct pci_driver *driver = to_pci_driver(dev->driver);
1667 if (!driver->driver_managed_dma)
1668 iommu_device_unuse_default_domain(dev);
1671 struct bus_type pci_bus_type = {
1673 .match = pci_bus_match,
1674 .uevent = pci_uevent,
1675 .probe = pci_device_probe,
1676 .remove = pci_device_remove,
1677 .shutdown = pci_device_shutdown,
1678 .dev_groups = pci_dev_groups,
1679 .bus_groups = pci_bus_groups,
1680 .drv_groups = pci_drv_groups,
1681 .pm = PCI_PM_OPS_PTR,
1682 .num_vf = pci_bus_num_vf,
1683 .dma_configure = pci_dma_configure,
1684 .dma_cleanup = pci_dma_cleanup,
1686 EXPORT_SYMBOL(pci_bus_type);
1688 #ifdef CONFIG_PCIEPORTBUS
1689 static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1691 struct pcie_device *pciedev;
1692 struct pcie_port_service_driver *driver;
1694 if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1697 pciedev = to_pcie_device(dev);
1698 driver = to_service_driver(drv);
1700 if (driver->service != pciedev->service)
1703 if (driver->port_type != PCIE_ANY_PORT &&
1704 driver->port_type != pci_pcie_type(pciedev->port))
1710 struct bus_type pcie_port_bus_type = {
1711 .name = "pci_express",
1712 .match = pcie_port_bus_match,
1714 EXPORT_SYMBOL_GPL(pcie_port_bus_type);
1717 static int __init pci_driver_init(void)
1721 ret = bus_register(&pci_bus_type);
1725 #ifdef CONFIG_PCIEPORTBUS
1726 ret = bus_register(&pcie_port_bus_type);
1730 dma_debug_add_bus(&pci_bus_type);
1733 postcore_initcall(pci_driver_init);