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/cpu.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/suspend.h>
18 #include <linux/kexec.h>
19 #include <linux/of_device.h>
20 #include <linux/acpi.h>
22 #include "pcie/portdrv.h"
25 struct list_head node
;
26 struct pci_device_id id
;
30 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
31 * @drv: target pci driver
32 * @vendor: PCI vendor ID
33 * @device: PCI device ID
34 * @subvendor: PCI subvendor ID
35 * @subdevice: PCI subdevice ID
37 * @class_mask: PCI class mask
38 * @driver_data: private driver data
40 * Adds a new dynamic pci device ID to this driver and causes the
41 * driver to probe for all devices again. @drv must have been
42 * registered prior to calling this function.
45 * Does GFP_KERNEL allocation.
48 * 0 on success, -errno on failure.
50 int pci_add_dynid(struct pci_driver
*drv
,
51 unsigned int vendor
, unsigned int device
,
52 unsigned int subvendor
, unsigned int subdevice
,
53 unsigned int class, unsigned int class_mask
,
54 unsigned long driver_data
)
56 struct pci_dynid
*dynid
;
58 dynid
= kzalloc(sizeof(*dynid
), GFP_KERNEL
);
62 dynid
->id
.vendor
= vendor
;
63 dynid
->id
.device
= device
;
64 dynid
->id
.subvendor
= subvendor
;
65 dynid
->id
.subdevice
= subdevice
;
66 dynid
->id
.class = class;
67 dynid
->id
.class_mask
= class_mask
;
68 dynid
->id
.driver_data
= driver_data
;
70 spin_lock(&drv
->dynids
.lock
);
71 list_add_tail(&dynid
->node
, &drv
->dynids
.list
);
72 spin_unlock(&drv
->dynids
.lock
);
74 return driver_attach(&drv
->driver
);
76 EXPORT_SYMBOL_GPL(pci_add_dynid
);
78 static void pci_free_dynids(struct pci_driver
*drv
)
80 struct pci_dynid
*dynid
, *n
;
82 spin_lock(&drv
->dynids
.lock
);
83 list_for_each_entry_safe(dynid
, n
, &drv
->dynids
.list
, node
) {
84 list_del(&dynid
->node
);
87 spin_unlock(&drv
->dynids
.lock
);
91 * store_new_id - sysfs frontend to pci_add_dynid()
92 * @driver: target device driver
93 * @buf: buffer for scanning device ID data
96 * Allow PCI IDs to be added to an existing driver via sysfs.
98 static ssize_t
new_id_store(struct device_driver
*driver
, const char *buf
,
101 struct pci_driver
*pdrv
= to_pci_driver(driver
);
102 const struct pci_device_id
*ids
= pdrv
->id_table
;
103 u32 vendor
, device
, subvendor
= PCI_ANY_ID
,
104 subdevice
= PCI_ANY_ID
, class = 0, class_mask
= 0;
105 unsigned long driver_data
= 0;
109 fields
= sscanf(buf
, "%x %x %x %x %x %x %lx",
110 &vendor
, &device
, &subvendor
, &subdevice
,
111 &class, &class_mask
, &driver_data
);
116 struct pci_dev
*pdev
= kzalloc(sizeof(*pdev
), GFP_KERNEL
);
120 pdev
->vendor
= vendor
;
121 pdev
->device
= device
;
122 pdev
->subsystem_vendor
= subvendor
;
123 pdev
->subsystem_device
= subdevice
;
126 if (pci_match_id(pdrv
->id_table
, pdev
))
135 /* Only accept driver_data values that match an existing id_table
139 while (ids
->vendor
|| ids
->subvendor
|| ids
->class_mask
) {
140 if (driver_data
== ids
->driver_data
) {
146 if (retval
) /* No match */
150 retval
= pci_add_dynid(pdrv
, vendor
, device
, subvendor
, subdevice
,
151 class, class_mask
, driver_data
);
156 static DRIVER_ATTR_WO(new_id
);
159 * store_remove_id - remove a PCI device ID from this driver
160 * @driver: target device driver
161 * @buf: buffer for scanning device ID data
164 * Removes a dynamic pci device ID to this driver.
166 static ssize_t
remove_id_store(struct device_driver
*driver
, const char *buf
,
169 struct pci_dynid
*dynid
, *n
;
170 struct pci_driver
*pdrv
= to_pci_driver(driver
);
171 u32 vendor
, device
, subvendor
= PCI_ANY_ID
,
172 subdevice
= PCI_ANY_ID
, class = 0, class_mask
= 0;
174 size_t retval
= -ENODEV
;
176 fields
= sscanf(buf
, "%x %x %x %x %x %x",
177 &vendor
, &device
, &subvendor
, &subdevice
,
178 &class, &class_mask
);
182 spin_lock(&pdrv
->dynids
.lock
);
183 list_for_each_entry_safe(dynid
, n
, &pdrv
->dynids
.list
, node
) {
184 struct pci_device_id
*id
= &dynid
->id
;
185 if ((id
->vendor
== vendor
) &&
186 (id
->device
== device
) &&
187 (subvendor
== PCI_ANY_ID
|| id
->subvendor
== subvendor
) &&
188 (subdevice
== PCI_ANY_ID
|| id
->subdevice
== subdevice
) &&
189 !((id
->class ^ class) & class_mask
)) {
190 list_del(&dynid
->node
);
196 spin_unlock(&pdrv
->dynids
.lock
);
200 static DRIVER_ATTR_WO(remove_id
);
202 static struct attribute
*pci_drv_attrs
[] = {
203 &driver_attr_new_id
.attr
,
204 &driver_attr_remove_id
.attr
,
207 ATTRIBUTE_GROUPS(pci_drv
);
210 * pci_match_id - See if a pci device matches a given pci_id table
211 * @ids: array of PCI device id structures to search in
212 * @dev: the PCI device structure to match against.
214 * Used by a driver to check whether a PCI device present in the
215 * system is in its list of supported devices. Returns the matching
216 * pci_device_id structure or %NULL if there is no match.
218 * Deprecated, don't use this as it will not catch any dynamic ids
219 * that a driver might want to check for.
221 const struct pci_device_id
*pci_match_id(const struct pci_device_id
*ids
,
225 while (ids
->vendor
|| ids
->subvendor
|| ids
->class_mask
) {
226 if (pci_match_one_device(ids
, dev
))
233 EXPORT_SYMBOL(pci_match_id
);
235 static const struct pci_device_id pci_device_id_any
= {
236 .vendor
= PCI_ANY_ID
,
237 .device
= PCI_ANY_ID
,
238 .subvendor
= PCI_ANY_ID
,
239 .subdevice
= PCI_ANY_ID
,
243 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
244 * @drv: the PCI driver to match against
245 * @dev: the PCI device structure to match against
247 * Used by a driver to check whether a PCI device present in the
248 * system is in its list of supported devices. Returns the matching
249 * pci_device_id structure or %NULL if there is no match.
251 static const struct pci_device_id
*pci_match_device(struct pci_driver
*drv
,
254 struct pci_dynid
*dynid
;
255 const struct pci_device_id
*found_id
= NULL
;
257 /* When driver_override is set, only bind to the matching driver */
258 if (dev
->driver_override
&& strcmp(dev
->driver_override
, drv
->name
))
261 /* Look at the dynamic ids first, before the static ones */
262 spin_lock(&drv
->dynids
.lock
);
263 list_for_each_entry(dynid
, &drv
->dynids
.list
, node
) {
264 if (pci_match_one_device(&dynid
->id
, dev
)) {
265 found_id
= &dynid
->id
;
269 spin_unlock(&drv
->dynids
.lock
);
272 found_id
= pci_match_id(drv
->id_table
, dev
);
274 /* driver_override will always match, send a dummy id */
275 if (!found_id
&& dev
->driver_override
)
276 found_id
= &pci_device_id_any
;
281 struct drv_dev_and_id
{
282 struct pci_driver
*drv
;
284 const struct pci_device_id
*id
;
287 static long local_pci_probe(void *_ddi
)
289 struct drv_dev_and_id
*ddi
= _ddi
;
290 struct pci_dev
*pci_dev
= ddi
->dev
;
291 struct pci_driver
*pci_drv
= ddi
->drv
;
292 struct device
*dev
= &pci_dev
->dev
;
296 * Unbound PCI devices are always put in D0, regardless of
297 * runtime PM status. During probe, the device is set to
298 * active and the usage count is incremented. If the driver
299 * supports runtime PM, it should call pm_runtime_put_noidle(),
300 * or any other runtime PM helper function decrementing the usage
301 * count, in its probe routine and pm_runtime_get_noresume() in
302 * its remove routine.
304 pm_runtime_get_sync(dev
);
305 pci_dev
->driver
= pci_drv
;
306 rc
= pci_drv
->probe(pci_dev
, ddi
->id
);
310 pci_dev
->driver
= NULL
;
311 pm_runtime_put_sync(dev
);
315 * Probe function should return < 0 for failure, 0 for success
316 * Treat values > 0 as success, but warn.
318 dev_warn(dev
, "Driver probe function unexpectedly returned %d\n", rc
);
322 static bool pci_physfn_is_probed(struct pci_dev
*dev
)
324 #ifdef CONFIG_PCI_IOV
325 return dev
->is_virtfn
&& dev
->physfn
->is_probed
;
331 static int pci_call_probe(struct pci_driver
*drv
, struct pci_dev
*dev
,
332 const struct pci_device_id
*id
)
334 int error
, node
, cpu
;
335 struct drv_dev_and_id ddi
= { drv
, dev
, id
};
338 * Execute driver initialization on node where the device is
339 * attached. This way the driver likely allocates its local memory
342 node
= dev_to_node(&dev
->dev
);
345 cpu_hotplug_disable();
348 * Prevent nesting work_on_cpu() for the case where a Virtual Function
349 * device is probed from work_on_cpu() of the Physical device.
351 if (node
< 0 || node
>= MAX_NUMNODES
|| !node_online(node
) ||
352 pci_physfn_is_probed(dev
))
355 cpu
= cpumask_any_and(cpumask_of_node(node
), cpu_online_mask
);
357 if (cpu
< nr_cpu_ids
)
358 error
= work_on_cpu(cpu
, local_pci_probe
, &ddi
);
360 error
= local_pci_probe(&ddi
);
363 cpu_hotplug_enable();
368 * __pci_device_probe - check if a driver wants to claim a specific PCI device
369 * @drv: driver to call to check if it wants the PCI device
370 * @pci_dev: PCI device being probed
372 * returns 0 on success, else error.
373 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
375 static int __pci_device_probe(struct pci_driver
*drv
, struct pci_dev
*pci_dev
)
377 const struct pci_device_id
*id
;
380 if (!pci_dev
->driver
&& drv
->probe
) {
383 id
= pci_match_device(drv
, pci_dev
);
385 error
= pci_call_probe(drv
, pci_dev
, id
);
390 int __weak
pcibios_alloc_irq(struct pci_dev
*dev
)
395 void __weak
pcibios_free_irq(struct pci_dev
*dev
)
399 #ifdef CONFIG_PCI_IOV
400 static inline bool pci_device_can_probe(struct pci_dev
*pdev
)
402 return (!pdev
->is_virtfn
|| pdev
->physfn
->sriov
->drivers_autoprobe
);
405 static inline bool pci_device_can_probe(struct pci_dev
*pdev
)
411 static int pci_device_probe(struct device
*dev
)
414 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
415 struct pci_driver
*drv
= to_pci_driver(dev
->driver
);
417 pci_assign_irq(pci_dev
);
419 error
= pcibios_alloc_irq(pci_dev
);
423 pci_dev_get(pci_dev
);
424 if (pci_device_can_probe(pci_dev
)) {
425 error
= __pci_device_probe(drv
, pci_dev
);
427 pcibios_free_irq(pci_dev
);
428 pci_dev_put(pci_dev
);
435 static int pci_device_remove(struct device
*dev
)
437 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
438 struct pci_driver
*drv
= pci_dev
->driver
;
442 pm_runtime_get_sync(dev
);
443 drv
->remove(pci_dev
);
444 pm_runtime_put_noidle(dev
);
446 pcibios_free_irq(pci_dev
);
447 pci_dev
->driver
= NULL
;
448 pci_iov_remove(pci_dev
);
451 /* Undo the runtime PM settings in local_pci_probe() */
452 pm_runtime_put_sync(dev
);
455 * If the device is still on, set the power state as "unknown",
456 * since it might change by the next time we load the driver.
458 if (pci_dev
->current_state
== PCI_D0
)
459 pci_dev
->current_state
= PCI_UNKNOWN
;
462 * We would love to complain here if pci_dev->is_enabled is set, that
463 * the driver should have called pci_disable_device(), but the
464 * unfortunate fact is there are too many odd BIOS and bridge setups
465 * that don't like drivers doing that all of the time.
466 * Oh well, we can dream of sane hardware when we sleep, no matter how
467 * horrible the crap we have to deal with is when we are awake...
470 pci_dev_put(pci_dev
);
474 static void pci_device_shutdown(struct device
*dev
)
476 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
477 struct pci_driver
*drv
= pci_dev
->driver
;
479 pm_runtime_resume(dev
);
481 if (drv
&& drv
->shutdown
)
482 drv
->shutdown(pci_dev
);
485 * If this is a kexec reboot, turn off Bus Master bit on the
486 * device to tell it to not continue to do DMA. Don't touch
487 * devices in D3cold or unknown states.
488 * If it is not a kexec reboot, firmware will hit the PCI
489 * devices with big hammer and stop their DMA any way.
491 if (kexec_in_progress
&& (pci_dev
->current_state
<= PCI_D3hot
))
492 pci_clear_master(pci_dev
);
497 /* Auxiliary functions used for system resume and run-time resume. */
500 * pci_restore_standard_config - restore standard config registers of PCI device
501 * @pci_dev: PCI device to handle
503 static int pci_restore_standard_config(struct pci_dev
*pci_dev
)
505 pci_update_current_state(pci_dev
, PCI_UNKNOWN
);
507 if (pci_dev
->current_state
!= PCI_D0
) {
508 int error
= pci_set_power_state(pci_dev
, PCI_D0
);
513 pci_restore_state(pci_dev
);
514 pci_pme_restore(pci_dev
);
520 #ifdef CONFIG_PM_SLEEP
522 static void pci_pm_default_resume_early(struct pci_dev
*pci_dev
)
524 pci_power_up(pci_dev
);
525 pci_restore_state(pci_dev
);
526 pci_pme_restore(pci_dev
);
527 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
531 * Default "suspend" method for devices that have no driver provided suspend,
532 * or not even a driver at all (second part).
534 static void pci_pm_set_unknown_state(struct pci_dev
*pci_dev
)
537 * mark its power state as "unknown", since we don't know if
538 * e.g. the BIOS will change its device state when we suspend.
540 if (pci_dev
->current_state
== PCI_D0
)
541 pci_dev
->current_state
= PCI_UNKNOWN
;
545 * Default "resume" method for devices that have no driver provided resume,
546 * or not even a driver at all (second part).
548 static int pci_pm_reenable_device(struct pci_dev
*pci_dev
)
552 /* if the device was enabled before suspend, reenable */
553 retval
= pci_reenable_device(pci_dev
);
555 * if the device was busmaster before the suspend, make it busmaster
558 if (pci_dev
->is_busmaster
)
559 pci_set_master(pci_dev
);
564 static int pci_legacy_suspend(struct device
*dev
, pm_message_t state
)
566 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
567 struct pci_driver
*drv
= pci_dev
->driver
;
569 if (drv
&& drv
->suspend
) {
570 pci_power_t prev
= pci_dev
->current_state
;
573 error
= drv
->suspend(pci_dev
, state
);
574 suspend_report_result(drv
->suspend
, error
);
578 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
579 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
580 WARN_ONCE(pci_dev
->current_state
!= prev
,
581 "PCI PM: Device state not saved by %pS\n",
586 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
591 static int pci_legacy_suspend_late(struct device
*dev
, pm_message_t state
)
593 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
594 struct pci_driver
*drv
= pci_dev
->driver
;
596 if (drv
&& drv
->suspend_late
) {
597 pci_power_t prev
= pci_dev
->current_state
;
600 error
= drv
->suspend_late(pci_dev
, state
);
601 suspend_report_result(drv
->suspend_late
, error
);
605 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
606 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
607 WARN_ONCE(pci_dev
->current_state
!= prev
,
608 "PCI PM: Device state not saved by %pS\n",
614 if (!pci_dev
->state_saved
)
615 pci_save_state(pci_dev
);
617 pci_pm_set_unknown_state(pci_dev
);
620 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
625 static int pci_legacy_resume_early(struct device
*dev
)
627 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
628 struct pci_driver
*drv
= pci_dev
->driver
;
630 return drv
&& drv
->resume_early
?
631 drv
->resume_early(pci_dev
) : 0;
634 static int pci_legacy_resume(struct device
*dev
)
636 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
637 struct pci_driver
*drv
= pci_dev
->driver
;
639 pci_fixup_device(pci_fixup_resume
, pci_dev
);
641 return drv
&& drv
->resume
?
642 drv
->resume(pci_dev
) : pci_pm_reenable_device(pci_dev
);
645 /* Auxiliary functions used by the new power management framework */
647 static void pci_pm_default_resume(struct pci_dev
*pci_dev
)
649 pci_fixup_device(pci_fixup_resume
, pci_dev
);
650 pci_enable_wake(pci_dev
, PCI_D0
, false);
653 static void pci_pm_default_suspend(struct pci_dev
*pci_dev
)
655 /* Disable non-bridge devices without PM support */
656 if (!pci_has_subordinate(pci_dev
))
657 pci_disable_enabled_device(pci_dev
);
660 static bool pci_has_legacy_pm_support(struct pci_dev
*pci_dev
)
662 struct pci_driver
*drv
= pci_dev
->driver
;
663 bool ret
= drv
&& (drv
->suspend
|| drv
->suspend_late
|| drv
->resume
664 || drv
->resume_early
);
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 WARN(ret
&& drv
->driver
.pm
, "driver %s device %04x:%04x\n",
672 drv
->name
, pci_dev
->vendor
, pci_dev
->device
);
677 /* New power management framework */
679 static int pci_pm_prepare(struct device
*dev
)
681 struct device_driver
*drv
= dev
->driver
;
683 if (drv
&& drv
->pm
&& drv
->pm
->prepare
) {
684 int error
= drv
->pm
->prepare(dev
);
688 if (!error
&& dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_PREPARE
))
691 return pci_dev_keep_suspended(to_pci_dev(dev
));
694 static void pci_pm_complete(struct device
*dev
)
696 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
698 pci_dev_complete_resume(pci_dev
);
699 pm_generic_complete(dev
);
701 /* Resume device if platform firmware has put it in reset-power-on */
702 if (pm_runtime_suspended(dev
) && pm_resume_via_firmware()) {
703 pci_power_t pre_sleep_state
= pci_dev
->current_state
;
705 pci_update_current_state(pci_dev
, pci_dev
->current_state
);
706 if (pci_dev
->current_state
< pre_sleep_state
)
707 pm_request_resume(dev
);
711 #else /* !CONFIG_PM_SLEEP */
713 #define pci_pm_prepare NULL
714 #define pci_pm_complete NULL
716 #endif /* !CONFIG_PM_SLEEP */
718 #ifdef CONFIG_SUSPEND
719 static void pcie_pme_root_status_cleanup(struct pci_dev
*pci_dev
)
722 * Some BIOSes forget to clear Root PME Status bits after system
723 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
724 * Clear those bits now just in case (shouldn't hurt).
726 if (pci_is_pcie(pci_dev
) &&
727 (pci_pcie_type(pci_dev
) == PCI_EXP_TYPE_ROOT_PORT
||
728 pci_pcie_type(pci_dev
) == PCI_EXP_TYPE_RC_EC
))
729 pcie_clear_root_pme_status(pci_dev
);
732 static int pci_pm_suspend(struct device
*dev
)
734 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
735 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
737 pci_dev
->skip_bus_pm
= false;
739 if (pci_has_legacy_pm_support(pci_dev
))
740 return pci_legacy_suspend(dev
, PMSG_SUSPEND
);
743 pci_pm_default_suspend(pci_dev
);
748 * PCI devices suspended at run time may need to be resumed at this
749 * point, because in general it may be necessary to reconfigure them for
750 * system suspend. Namely, if the device is expected to wake up the
751 * system from the sleep state, it may have to be reconfigured for this
752 * purpose, or if the device is not expected to wake up the system from
753 * the sleep state, it should be prevented from signaling wakeup events
756 * Also if the driver of the device does not indicate that its system
757 * suspend callbacks can cope with runtime-suspended devices, it is
758 * better to resume the device from runtime suspend here.
760 if (!dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_SUSPEND
) ||
761 !pci_dev_keep_suspended(pci_dev
)) {
762 pm_runtime_resume(dev
);
763 pci_dev
->state_saved
= false;
767 pci_power_t prev
= pci_dev
->current_state
;
770 error
= pm
->suspend(dev
);
771 suspend_report_result(pm
->suspend
, error
);
775 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
776 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
777 WARN_ONCE(pci_dev
->current_state
!= prev
,
778 "PCI PM: State of device not saved by %pS\n",
786 static int pci_pm_suspend_late(struct device
*dev
)
788 if (dev_pm_smart_suspend_and_suspended(dev
))
791 pci_fixup_device(pci_fixup_suspend
, to_pci_dev(dev
));
793 return pm_generic_suspend_late(dev
);
796 static int pci_pm_suspend_noirq(struct device
*dev
)
798 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
799 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
801 if (dev_pm_smart_suspend_and_suspended(dev
)) {
802 dev
->power
.may_skip_resume
= true;
806 if (pci_has_legacy_pm_support(pci_dev
))
807 return pci_legacy_suspend_late(dev
, PMSG_SUSPEND
);
810 pci_save_state(pci_dev
);
814 if (pm
->suspend_noirq
) {
815 pci_power_t prev
= pci_dev
->current_state
;
818 error
= pm
->suspend_noirq(dev
);
819 suspend_report_result(pm
->suspend_noirq
, error
);
823 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
824 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
825 WARN_ONCE(pci_dev
->current_state
!= prev
,
826 "PCI PM: State of device not saved by %pS\n",
832 if (pci_dev
->skip_bus_pm
) {
834 * The function is running for the second time in a row without
835 * going through full resume, which is possible only during
836 * suspend-to-idle in a spurious wakeup case. Moreover, the
837 * device was originally left in D0, so its power state should
838 * not be changed here and the device register values saved
839 * originally should be restored on resume again.
841 pci_dev
->state_saved
= true;
842 } else if (pci_dev
->state_saved
) {
843 if (pci_dev
->current_state
== PCI_D0
)
844 pci_dev
->skip_bus_pm
= true;
846 pci_save_state(pci_dev
);
847 if (pci_power_manageable(pci_dev
))
848 pci_prepare_to_sleep(pci_dev
);
851 dev_dbg(dev
, "PCI PM: Suspend power state: %s\n",
852 pci_power_name(pci_dev
->current_state
));
854 pci_pm_set_unknown_state(pci_dev
);
857 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
858 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
859 * hasn't been quiesced and tries to turn it off. If the controller
860 * is already in D3, this can hang or cause memory corruption.
862 * Since the value of the COMMAND register doesn't matter once the
863 * device has been suspended, we can safely set it to 0 here.
865 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
866 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
869 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
872 * If the target system sleep state is suspend-to-idle, it is sufficient
873 * to check whether or not the device's wakeup settings are good for
874 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
875 * pci_pm_complete() to take care of fixing up the device's state
876 * anyway, if need be.
878 dev
->power
.may_skip_resume
= device_may_wakeup(dev
) ||
879 !device_can_wakeup(dev
);
884 static int pci_pm_resume_noirq(struct device
*dev
)
886 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
887 struct device_driver
*drv
= dev
->driver
;
890 if (dev_pm_may_skip_resume(dev
))
894 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
895 * during system suspend, so update their runtime PM status to "active"
896 * as they are going to be put into D0 shortly.
898 if (dev_pm_smart_suspend_and_suspended(dev
))
899 pm_runtime_set_active(dev
);
901 pci_pm_default_resume_early(pci_dev
);
903 if (pci_has_legacy_pm_support(pci_dev
))
904 return pci_legacy_resume_early(dev
);
906 pcie_pme_root_status_cleanup(pci_dev
);
908 if (drv
&& drv
->pm
&& drv
->pm
->resume_noirq
)
909 error
= drv
->pm
->resume_noirq(dev
);
914 static int pci_pm_resume(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
;
921 * This is necessary for the suspend error path in which resume is
922 * called without restoring the standard config registers of the device.
924 if (pci_dev
->state_saved
)
925 pci_restore_standard_config(pci_dev
);
927 if (pci_has_legacy_pm_support(pci_dev
))
928 return pci_legacy_resume(dev
);
930 pci_pm_default_resume(pci_dev
);
934 error
= pm
->resume(dev
);
936 pci_pm_reenable_device(pci_dev
);
942 #else /* !CONFIG_SUSPEND */
944 #define pci_pm_suspend NULL
945 #define pci_pm_suspend_late NULL
946 #define pci_pm_suspend_noirq NULL
947 #define pci_pm_resume NULL
948 #define pci_pm_resume_noirq NULL
950 #endif /* !CONFIG_SUSPEND */
952 #ifdef CONFIG_HIBERNATE_CALLBACKS
956 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
957 * a hibernate transition
959 struct dev_pm_ops __weak pcibios_pm_ops
;
961 static int pci_pm_freeze(struct device
*dev
)
963 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
964 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
966 if (pci_has_legacy_pm_support(pci_dev
))
967 return pci_legacy_suspend(dev
, PMSG_FREEZE
);
970 pci_pm_default_suspend(pci_dev
);
975 * Resume all runtime-suspended devices before creating a snapshot
976 * image of system memory, because the restore kernel generally cannot
977 * be expected to always handle them consistently and they need to be
978 * put into the runtime-active metastate during system resume anyway,
979 * so it is better to ensure that the state saved in the image will be
980 * always consistent with that.
982 pm_runtime_resume(dev
);
983 pci_dev
->state_saved
= false;
988 error
= pm
->freeze(dev
);
989 suspend_report_result(pm
->freeze
, error
);
997 static int pci_pm_freeze_noirq(struct device
*dev
)
999 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1000 struct device_driver
*drv
= dev
->driver
;
1002 if (pci_has_legacy_pm_support(pci_dev
))
1003 return pci_legacy_suspend_late(dev
, PMSG_FREEZE
);
1005 if (drv
&& drv
->pm
&& drv
->pm
->freeze_noirq
) {
1008 error
= drv
->pm
->freeze_noirq(dev
);
1009 suspend_report_result(drv
->pm
->freeze_noirq
, error
);
1014 if (!pci_dev
->state_saved
)
1015 pci_save_state(pci_dev
);
1017 pci_pm_set_unknown_state(pci_dev
);
1019 if (pcibios_pm_ops
.freeze_noirq
)
1020 return pcibios_pm_ops
.freeze_noirq(dev
);
1025 static int pci_pm_thaw_noirq(struct device
*dev
)
1027 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1028 struct device_driver
*drv
= dev
->driver
;
1031 if (pcibios_pm_ops
.thaw_noirq
) {
1032 error
= pcibios_pm_ops
.thaw_noirq(dev
);
1037 if (pci_has_legacy_pm_support(pci_dev
))
1038 return pci_legacy_resume_early(dev
);
1041 * pci_restore_state() requires the device to be in D0 (because of MSI
1042 * restoration among other things), so force it into D0 in case the
1043 * driver's "freeze" callbacks put it into a low-power state directly.
1045 pci_set_power_state(pci_dev
, PCI_D0
);
1046 pci_restore_state(pci_dev
);
1048 if (drv
&& drv
->pm
&& drv
->pm
->thaw_noirq
)
1049 error
= drv
->pm
->thaw_noirq(dev
);
1054 static int pci_pm_thaw(struct device
*dev
)
1056 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1057 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1060 if (pci_has_legacy_pm_support(pci_dev
))
1061 return pci_legacy_resume(dev
);
1065 error
= pm
->thaw(dev
);
1067 pci_pm_reenable_device(pci_dev
);
1070 pci_dev
->state_saved
= false;
1075 static int pci_pm_poweroff(struct device
*dev
)
1077 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1078 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1080 if (pci_has_legacy_pm_support(pci_dev
))
1081 return pci_legacy_suspend(dev
, PMSG_HIBERNATE
);
1084 pci_pm_default_suspend(pci_dev
);
1088 /* The reason to do that is the same as in pci_pm_suspend(). */
1089 if (!dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_SUSPEND
) ||
1090 !pci_dev_keep_suspended(pci_dev
))
1091 pm_runtime_resume(dev
);
1093 pci_dev
->state_saved
= false;
1097 error
= pm
->poweroff(dev
);
1098 suspend_report_result(pm
->poweroff
, error
);
1106 static int pci_pm_poweroff_late(struct device
*dev
)
1108 if (dev_pm_smart_suspend_and_suspended(dev
))
1111 pci_fixup_device(pci_fixup_suspend
, to_pci_dev(dev
));
1113 return pm_generic_poweroff_late(dev
);
1116 static int pci_pm_poweroff_noirq(struct device
*dev
)
1118 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1119 struct device_driver
*drv
= dev
->driver
;
1121 if (dev_pm_smart_suspend_and_suspended(dev
))
1124 if (pci_has_legacy_pm_support(to_pci_dev(dev
)))
1125 return pci_legacy_suspend_late(dev
, PMSG_HIBERNATE
);
1127 if (!drv
|| !drv
->pm
) {
1128 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
1132 if (drv
->pm
->poweroff_noirq
) {
1135 error
= drv
->pm
->poweroff_noirq(dev
);
1136 suspend_report_result(drv
->pm
->poweroff_noirq
, error
);
1141 if (!pci_dev
->state_saved
&& !pci_has_subordinate(pci_dev
))
1142 pci_prepare_to_sleep(pci_dev
);
1145 * The reason for doing this here is the same as for the analogous code
1146 * in pci_pm_suspend_noirq().
1148 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
1149 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
1151 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
1153 if (pcibios_pm_ops
.poweroff_noirq
)
1154 return pcibios_pm_ops
.poweroff_noirq(dev
);
1159 static int pci_pm_restore_noirq(struct device
*dev
)
1161 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1162 struct device_driver
*drv
= dev
->driver
;
1165 if (pcibios_pm_ops
.restore_noirq
) {
1166 error
= pcibios_pm_ops
.restore_noirq(dev
);
1171 pci_pm_default_resume_early(pci_dev
);
1173 if (pci_has_legacy_pm_support(pci_dev
))
1174 return pci_legacy_resume_early(dev
);
1176 if (drv
&& drv
->pm
&& drv
->pm
->restore_noirq
)
1177 error
= drv
->pm
->restore_noirq(dev
);
1182 static int pci_pm_restore(struct device
*dev
)
1184 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1185 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1189 * This is necessary for the hibernation error path in which restore is
1190 * called without restoring the standard config registers of the device.
1192 if (pci_dev
->state_saved
)
1193 pci_restore_standard_config(pci_dev
);
1195 if (pci_has_legacy_pm_support(pci_dev
))
1196 return pci_legacy_resume(dev
);
1198 pci_pm_default_resume(pci_dev
);
1202 error
= pm
->restore(dev
);
1204 pci_pm_reenable_device(pci_dev
);
1210 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1212 #define pci_pm_freeze NULL
1213 #define pci_pm_freeze_noirq NULL
1214 #define pci_pm_thaw NULL
1215 #define pci_pm_thaw_noirq NULL
1216 #define pci_pm_poweroff NULL
1217 #define pci_pm_poweroff_late NULL
1218 #define pci_pm_poweroff_noirq NULL
1219 #define pci_pm_restore NULL
1220 #define pci_pm_restore_noirq NULL
1222 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1226 static int pci_pm_runtime_suspend(struct device
*dev
)
1228 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1229 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1230 pci_power_t prev
= pci_dev
->current_state
;
1234 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1235 * but it may go to D3cold when the bridge above it runtime suspends.
1236 * Save its config space in case that happens.
1238 if (!pci_dev
->driver
) {
1239 pci_save_state(pci_dev
);
1243 pci_dev
->state_saved
= false;
1244 if (pm
&& pm
->runtime_suspend
) {
1245 error
= pm
->runtime_suspend(dev
);
1247 * -EBUSY and -EAGAIN is used to request the runtime PM core
1248 * to schedule a new suspend, so log the event only with debug
1251 if (error
== -EBUSY
|| error
== -EAGAIN
) {
1252 dev_dbg(dev
, "can't suspend now (%ps returned %d)\n",
1253 pm
->runtime_suspend
, error
);
1256 dev_err(dev
, "can't suspend (%ps returned %d)\n",
1257 pm
->runtime_suspend
, error
);
1262 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
1264 if (pm
&& pm
->runtime_suspend
1265 && !pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
1266 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
1267 WARN_ONCE(pci_dev
->current_state
!= prev
,
1268 "PCI PM: State of device not saved by %pS\n",
1269 pm
->runtime_suspend
);
1273 if (!pci_dev
->state_saved
) {
1274 pci_save_state(pci_dev
);
1275 pci_finish_runtime_suspend(pci_dev
);
1281 static int pci_pm_runtime_resume(struct device
*dev
)
1284 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1285 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1288 * Restoring config space is necessary even if the device is not bound
1289 * to a driver because although we left it in D0, it may have gone to
1290 * D3cold when the bridge above it runtime suspended.
1292 pci_restore_standard_config(pci_dev
);
1294 if (!pci_dev
->driver
)
1297 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
1298 pci_enable_wake(pci_dev
, PCI_D0
, false);
1299 pci_fixup_device(pci_fixup_resume
, pci_dev
);
1301 if (pm
&& pm
->runtime_resume
)
1302 rc
= pm
->runtime_resume(dev
);
1304 pci_dev
->runtime_d3cold
= false;
1309 static int pci_pm_runtime_idle(struct device
*dev
)
1311 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1312 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1316 * If pci_dev->driver is not set (unbound), the device should
1317 * always remain in D0 regardless of the runtime PM status
1319 if (!pci_dev
->driver
)
1325 if (pm
->runtime_idle
)
1326 ret
= pm
->runtime_idle(dev
);
1331 static const struct dev_pm_ops pci_dev_pm_ops
= {
1332 .prepare
= pci_pm_prepare
,
1333 .complete
= pci_pm_complete
,
1334 .suspend
= pci_pm_suspend
,
1335 .suspend_late
= pci_pm_suspend_late
,
1336 .resume
= pci_pm_resume
,
1337 .freeze
= pci_pm_freeze
,
1338 .thaw
= pci_pm_thaw
,
1339 .poweroff
= pci_pm_poweroff
,
1340 .poweroff_late
= pci_pm_poweroff_late
,
1341 .restore
= pci_pm_restore
,
1342 .suspend_noirq
= pci_pm_suspend_noirq
,
1343 .resume_noirq
= pci_pm_resume_noirq
,
1344 .freeze_noirq
= pci_pm_freeze_noirq
,
1345 .thaw_noirq
= pci_pm_thaw_noirq
,
1346 .poweroff_noirq
= pci_pm_poweroff_noirq
,
1347 .restore_noirq
= pci_pm_restore_noirq
,
1348 .runtime_suspend
= pci_pm_runtime_suspend
,
1349 .runtime_resume
= pci_pm_runtime_resume
,
1350 .runtime_idle
= pci_pm_runtime_idle
,
1353 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1355 #else /* !CONFIG_PM */
1357 #define pci_pm_runtime_suspend NULL
1358 #define pci_pm_runtime_resume NULL
1359 #define pci_pm_runtime_idle NULL
1361 #define PCI_PM_OPS_PTR NULL
1363 #endif /* !CONFIG_PM */
1366 * __pci_register_driver - register a new pci driver
1367 * @drv: the driver structure to register
1368 * @owner: owner module of drv
1369 * @mod_name: module name string
1371 * Adds the driver structure to the list of registered drivers.
1372 * Returns a negative value on error, otherwise 0.
1373 * If no error occurred, the driver remains registered even if
1374 * no device was claimed during registration.
1376 int __pci_register_driver(struct pci_driver
*drv
, struct module
*owner
,
1377 const char *mod_name
)
1379 /* initialize common driver fields */
1380 drv
->driver
.name
= drv
->name
;
1381 drv
->driver
.bus
= &pci_bus_type
;
1382 drv
->driver
.owner
= owner
;
1383 drv
->driver
.mod_name
= mod_name
;
1384 drv
->driver
.groups
= drv
->groups
;
1386 spin_lock_init(&drv
->dynids
.lock
);
1387 INIT_LIST_HEAD(&drv
->dynids
.list
);
1389 /* register with core */
1390 return driver_register(&drv
->driver
);
1392 EXPORT_SYMBOL(__pci_register_driver
);
1395 * pci_unregister_driver - unregister a pci driver
1396 * @drv: the driver structure to unregister
1398 * Deletes the driver structure from the list of registered PCI drivers,
1399 * gives it a chance to clean up by calling its remove() function for
1400 * each device it was responsible for, and marks those devices as
1404 void pci_unregister_driver(struct pci_driver
*drv
)
1406 driver_unregister(&drv
->driver
);
1407 pci_free_dynids(drv
);
1409 EXPORT_SYMBOL(pci_unregister_driver
);
1411 static struct pci_driver pci_compat_driver
= {
1416 * pci_dev_driver - get the pci_driver of a device
1417 * @dev: the device to query
1419 * Returns the appropriate pci_driver structure or %NULL if there is no
1420 * registered driver for the device.
1422 struct pci_driver
*pci_dev_driver(const struct pci_dev
*dev
)
1428 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1429 if (dev
->resource
[i
].flags
& IORESOURCE_BUSY
)
1430 return &pci_compat_driver
;
1434 EXPORT_SYMBOL(pci_dev_driver
);
1437 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1438 * @dev: the PCI device structure to match against
1439 * @drv: the device driver to search for matching PCI device id structures
1441 * Used by a driver to check whether a PCI device present in the
1442 * system is in its list of supported devices. Returns the matching
1443 * pci_device_id structure or %NULL if there is no match.
1445 static int pci_bus_match(struct device
*dev
, struct device_driver
*drv
)
1447 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1448 struct pci_driver
*pci_drv
;
1449 const struct pci_device_id
*found_id
;
1451 if (!pci_dev
->match_driver
)
1454 pci_drv
= to_pci_driver(drv
);
1455 found_id
= pci_match_device(pci_drv
, pci_dev
);
1463 * pci_dev_get - increments the reference count of the pci device structure
1464 * @dev: the device being referenced
1466 * Each live reference to a device should be refcounted.
1468 * Drivers for PCI devices should normally record such references in
1469 * their probe() methods, when they bind to a device, and release
1470 * them by calling pci_dev_put(), in their disconnect() methods.
1472 * A pointer to the device with the incremented reference counter is returned.
1474 struct pci_dev
*pci_dev_get(struct pci_dev
*dev
)
1477 get_device(&dev
->dev
);
1480 EXPORT_SYMBOL(pci_dev_get
);
1483 * pci_dev_put - release a use of the pci device structure
1484 * @dev: device that's been disconnected
1486 * Must be called when a user of a device is finished with it. When the last
1487 * user of the device calls this function, the memory of the device is freed.
1489 void pci_dev_put(struct pci_dev
*dev
)
1492 put_device(&dev
->dev
);
1494 EXPORT_SYMBOL(pci_dev_put
);
1496 static int pci_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1498 struct pci_dev
*pdev
;
1503 pdev
= to_pci_dev(dev
);
1505 if (add_uevent_var(env
, "PCI_CLASS=%04X", pdev
->class))
1508 if (add_uevent_var(env
, "PCI_ID=%04X:%04X", pdev
->vendor
, pdev
->device
))
1511 if (add_uevent_var(env
, "PCI_SUBSYS_ID=%04X:%04X", pdev
->subsystem_vendor
,
1512 pdev
->subsystem_device
))
1515 if (add_uevent_var(env
, "PCI_SLOT_NAME=%s", pci_name(pdev
)))
1518 if (add_uevent_var(env
, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1519 pdev
->vendor
, pdev
->device
,
1520 pdev
->subsystem_vendor
, pdev
->subsystem_device
,
1521 (u8
)(pdev
->class >> 16), (u8
)(pdev
->class >> 8),
1528 #if defined(CONFIG_PCIEPORTBUS) || defined(CONFIG_EEH)
1530 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1531 * @pdev: PCI device undergoing error recovery
1532 * @err_type: type of error event
1534 void pci_uevent_ers(struct pci_dev
*pdev
, enum pci_ers_result err_type
)
1540 case PCI_ERS_RESULT_NONE
:
1541 case PCI_ERS_RESULT_CAN_RECOVER
:
1542 envp
[idx
++] = "ERROR_EVENT=BEGIN_RECOVERY";
1543 envp
[idx
++] = "DEVICE_ONLINE=0";
1545 case PCI_ERS_RESULT_RECOVERED
:
1546 envp
[idx
++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1547 envp
[idx
++] = "DEVICE_ONLINE=1";
1549 case PCI_ERS_RESULT_DISCONNECT
:
1550 envp
[idx
++] = "ERROR_EVENT=FAILED_RECOVERY";
1551 envp
[idx
++] = "DEVICE_ONLINE=0";
1559 kobject_uevent_env(&pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
1564 static int pci_bus_num_vf(struct device
*dev
)
1566 return pci_num_vf(to_pci_dev(dev
));
1570 * pci_dma_configure - Setup DMA configuration
1571 * @dev: ptr to dev structure
1573 * Function to update PCI devices's DMA configuration using the same
1574 * info from the OF node or ACPI node of host bridge's parent (if any).
1576 static int pci_dma_configure(struct device
*dev
)
1578 struct device
*bridge
;
1581 bridge
= pci_get_host_bridge_device(to_pci_dev(dev
));
1583 if (IS_ENABLED(CONFIG_OF
) && bridge
->parent
&&
1584 bridge
->parent
->of_node
) {
1585 ret
= of_dma_configure(dev
, bridge
->parent
->of_node
, true);
1586 } else if (has_acpi_companion(bridge
)) {
1587 struct acpi_device
*adev
= to_acpi_device_node(bridge
->fwnode
);
1589 ret
= acpi_dma_configure(dev
, acpi_get_dma_attr(adev
));
1592 pci_put_host_bridge_device(bridge
);
1596 struct bus_type pci_bus_type
= {
1598 .match
= pci_bus_match
,
1599 .uevent
= pci_uevent
,
1600 .probe
= pci_device_probe
,
1601 .remove
= pci_device_remove
,
1602 .shutdown
= pci_device_shutdown
,
1603 .dev_groups
= pci_dev_groups
,
1604 .bus_groups
= pci_bus_groups
,
1605 .drv_groups
= pci_drv_groups
,
1606 .pm
= PCI_PM_OPS_PTR
,
1607 .num_vf
= pci_bus_num_vf
,
1608 .dma_configure
= pci_dma_configure
,
1610 EXPORT_SYMBOL(pci_bus_type
);
1612 #ifdef CONFIG_PCIEPORTBUS
1613 static int pcie_port_bus_match(struct device
*dev
, struct device_driver
*drv
)
1615 struct pcie_device
*pciedev
;
1616 struct pcie_port_service_driver
*driver
;
1618 if (drv
->bus
!= &pcie_port_bus_type
|| dev
->bus
!= &pcie_port_bus_type
)
1621 pciedev
= to_pcie_device(dev
);
1622 driver
= to_service_driver(drv
);
1624 if (driver
->service
!= pciedev
->service
)
1627 if (driver
->port_type
!= PCIE_ANY_PORT
&&
1628 driver
->port_type
!= pci_pcie_type(pciedev
->port
))
1634 struct bus_type pcie_port_bus_type
= {
1635 .name
= "pci_express",
1636 .match
= pcie_port_bus_match
,
1638 EXPORT_SYMBOL_GPL(pcie_port_bus_type
);
1641 static int __init
pci_driver_init(void)
1645 ret
= bus_register(&pci_bus_type
);
1649 #ifdef CONFIG_PCIEPORTBUS
1650 ret
= bus_register(&pcie_port_bus_type
);
1654 dma_debug_add_bus(&pci_bus_type
);
1657 postcore_initcall(pci_driver_init
);