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 #ifdef CONFIG_PCI_IOV
423 static inline bool pci_device_can_probe(struct pci_dev
*pdev
)
425 return (!pdev
->is_virtfn
|| pdev
->physfn
->sriov
->drivers_autoprobe
||
426 pdev
->driver_override
);
429 static inline bool pci_device_can_probe(struct pci_dev
*pdev
)
435 static int pci_device_probe(struct device
*dev
)
438 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
439 struct pci_driver
*drv
= to_pci_driver(dev
->driver
);
441 if (!pci_device_can_probe(pci_dev
))
444 pci_assign_irq(pci_dev
);
446 error
= pcibios_alloc_irq(pci_dev
);
450 pci_dev_get(pci_dev
);
451 error
= __pci_device_probe(drv
, pci_dev
);
453 pcibios_free_irq(pci_dev
);
454 pci_dev_put(pci_dev
);
460 static void pci_device_remove(struct device
*dev
)
462 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
463 struct pci_driver
*drv
= pci_dev
->driver
;
466 pm_runtime_get_sync(dev
);
468 * If the driver provides a .runtime_idle() callback and it has
469 * started to run already, it may continue to run in parallel
470 * with the code below, so wait until all of the runtime PM
471 * activity has completed.
473 pm_runtime_barrier(dev
);
474 drv
->remove(pci_dev
);
475 pm_runtime_put_noidle(dev
);
477 pcibios_free_irq(pci_dev
);
478 pci_dev
->driver
= NULL
;
479 pci_iov_remove(pci_dev
);
481 /* Undo the runtime PM settings in local_pci_probe() */
482 pm_runtime_put_sync(dev
);
485 * If the device is still on, set the power state as "unknown",
486 * since it might change by the next time we load the driver.
488 if (pci_dev
->current_state
== PCI_D0
)
489 pci_dev
->current_state
= PCI_UNKNOWN
;
492 * We would love to complain here if pci_dev->is_enabled is set, that
493 * the driver should have called pci_disable_device(), but the
494 * unfortunate fact is there are too many odd BIOS and bridge setups
495 * that don't like drivers doing that all of the time.
496 * Oh well, we can dream of sane hardware when we sleep, no matter how
497 * horrible the crap we have to deal with is when we are awake...
500 pci_dev_put(pci_dev
);
503 static void pci_device_shutdown(struct device
*dev
)
505 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
506 struct pci_driver
*drv
= pci_dev
->driver
;
508 pm_runtime_resume(dev
);
510 if (drv
&& drv
->shutdown
)
511 drv
->shutdown(pci_dev
);
514 * If this is a kexec reboot, turn off Bus Master bit on the
515 * device to tell it to not continue to do DMA. Don't touch
516 * devices in D3cold or unknown states.
517 * If it is not a kexec reboot, firmware will hit the PCI
518 * devices with big hammer and stop their DMA any way.
520 if (kexec_in_progress
&& (pci_dev
->current_state
<= PCI_D3hot
))
521 pci_clear_master(pci_dev
);
524 #ifdef CONFIG_PM_SLEEP
526 /* Auxiliary functions used for system resume */
529 * pci_restore_standard_config - restore standard config registers of PCI device
530 * @pci_dev: PCI device to handle
532 static int pci_restore_standard_config(struct pci_dev
*pci_dev
)
534 pci_update_current_state(pci_dev
, PCI_UNKNOWN
);
536 if (pci_dev
->current_state
!= PCI_D0
) {
537 int error
= pci_set_power_state(pci_dev
, PCI_D0
);
542 pci_restore_state(pci_dev
);
543 pci_pme_restore(pci_dev
);
546 #endif /* CONFIG_PM_SLEEP */
550 /* Auxiliary functions used for system resume and run-time resume */
552 static void pci_pm_default_resume(struct pci_dev
*pci_dev
)
554 pci_fixup_device(pci_fixup_resume
, pci_dev
);
555 pci_enable_wake(pci_dev
, PCI_D0
, false);
558 static void pci_pm_power_up_and_verify_state(struct pci_dev
*pci_dev
)
560 pci_power_up(pci_dev
);
561 pci_update_current_state(pci_dev
, PCI_D0
);
564 static void pci_pm_default_resume_early(struct pci_dev
*pci_dev
)
566 pci_pm_power_up_and_verify_state(pci_dev
);
567 pci_restore_state(pci_dev
);
568 pci_pme_restore(pci_dev
);
571 static void pci_pm_bridge_power_up_actions(struct pci_dev
*pci_dev
)
575 ret
= pci_bridge_wait_for_secondary_bus(pci_dev
, "resume");
578 * The downstream link failed to come up, so mark the
579 * devices below as disconnected to make sure we don't
580 * attempt to resume them.
582 pci_walk_bus(pci_dev
->subordinate
, pci_dev_set_disconnected
,
588 * When powering on a bridge from D3cold, the whole hierarchy may be
589 * powered on into D0uninitialized state, resume them to give them a
590 * chance to suspend again
592 pci_resume_bus(pci_dev
->subordinate
);
595 #endif /* CONFIG_PM */
597 #ifdef CONFIG_PM_SLEEP
600 * Default "suspend" method for devices that have no driver provided suspend,
601 * or not even a driver at all (second part).
603 static void pci_pm_set_unknown_state(struct pci_dev
*pci_dev
)
606 * mark its power state as "unknown", since we don't know if
607 * e.g. the BIOS will change its device state when we suspend.
609 if (pci_dev
->current_state
== PCI_D0
)
610 pci_dev
->current_state
= PCI_UNKNOWN
;
614 * Default "resume" method for devices that have no driver provided resume,
615 * or not even a driver at all (second part).
617 static int pci_pm_reenable_device(struct pci_dev
*pci_dev
)
621 /* if the device was enabled before suspend, re-enable */
622 retval
= pci_reenable_device(pci_dev
);
624 * if the device was busmaster before the suspend, make it busmaster
627 if (pci_dev
->is_busmaster
)
628 pci_set_master(pci_dev
);
633 static int pci_legacy_suspend(struct device
*dev
, pm_message_t state
)
635 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
636 struct pci_driver
*drv
= pci_dev
->driver
;
638 if (drv
&& drv
->suspend
) {
639 pci_power_t prev
= pci_dev
->current_state
;
642 error
= drv
->suspend(pci_dev
, state
);
643 suspend_report_result(dev
, drv
->suspend
, error
);
647 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
648 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
649 pci_WARN_ONCE(pci_dev
, pci_dev
->current_state
!= prev
,
650 "PCI PM: Device state not saved by %pS\n",
655 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
660 static int pci_legacy_suspend_late(struct device
*dev
)
662 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
664 if (!pci_dev
->state_saved
)
665 pci_save_state(pci_dev
);
667 pci_pm_set_unknown_state(pci_dev
);
669 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
674 static int pci_legacy_resume(struct device
*dev
)
676 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
677 struct pci_driver
*drv
= pci_dev
->driver
;
679 pci_fixup_device(pci_fixup_resume
, pci_dev
);
681 return drv
&& drv
->resume
?
682 drv
->resume(pci_dev
) : pci_pm_reenable_device(pci_dev
);
685 /* Auxiliary functions used by the new power management framework */
687 static void pci_pm_default_suspend(struct pci_dev
*pci_dev
)
689 /* Disable non-bridge devices without PM support */
690 if (!pci_has_subordinate(pci_dev
))
691 pci_disable_enabled_device(pci_dev
);
694 static bool pci_has_legacy_pm_support(struct pci_dev
*pci_dev
)
696 struct pci_driver
*drv
= pci_dev
->driver
;
697 bool ret
= drv
&& (drv
->suspend
|| drv
->resume
);
700 * Legacy PM support is used by default, so warn if the new framework is
701 * supported as well. Drivers are supposed to support either the
702 * former, or the latter, but not both at the same time.
704 pci_WARN(pci_dev
, ret
&& drv
->driver
.pm
, "device %04x:%04x\n",
705 pci_dev
->vendor
, pci_dev
->device
);
710 /* New power management framework */
712 static int pci_pm_prepare(struct device
*dev
)
714 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
715 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
717 if (pm
&& pm
->prepare
) {
718 int error
= pm
->prepare(dev
);
722 if (!error
&& dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_PREPARE
))
725 if (pci_dev_need_resume(pci_dev
))
729 * The PME setting needs to be adjusted here in case the direct-complete
730 * optimization is used with respect to this device.
732 pci_dev_adjust_pme(pci_dev
);
736 static void pci_pm_complete(struct device
*dev
)
738 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
740 pci_dev_complete_resume(pci_dev
);
741 pm_generic_complete(dev
);
743 /* Resume device if platform firmware has put it in reset-power-on */
744 if (pm_runtime_suspended(dev
) && pm_resume_via_firmware()) {
745 pci_power_t pre_sleep_state
= pci_dev
->current_state
;
747 pci_refresh_power_state(pci_dev
);
749 * On platforms with ACPI this check may also trigger for
750 * devices sharing power resources if one of those power
751 * resources has been activated as a result of a change of the
752 * power state of another device sharing it. However, in that
753 * case it is also better to resume the device, in general.
755 if (pci_dev
->current_state
< pre_sleep_state
)
756 pm_request_resume(dev
);
760 #else /* !CONFIG_PM_SLEEP */
762 #define pci_pm_prepare NULL
763 #define pci_pm_complete NULL
765 #endif /* !CONFIG_PM_SLEEP */
767 #ifdef CONFIG_SUSPEND
768 static void pcie_pme_root_status_cleanup(struct pci_dev
*pci_dev
)
771 * Some BIOSes forget to clear Root PME Status bits after system
772 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
773 * Clear those bits now just in case (shouldn't hurt).
775 if (pci_is_pcie(pci_dev
) &&
776 (pci_pcie_type(pci_dev
) == PCI_EXP_TYPE_ROOT_PORT
||
777 pci_pcie_type(pci_dev
) == PCI_EXP_TYPE_RC_EC
))
778 pcie_clear_root_pme_status(pci_dev
);
781 static int pci_pm_suspend(struct device
*dev
)
783 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
784 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
786 pci_dev
->skip_bus_pm
= false;
789 * Disabling PTM allows some systems, e.g., Intel mobile chips
790 * since Coffee Lake, to enter a lower-power PM state.
792 pci_suspend_ptm(pci_dev
);
794 if (pci_has_legacy_pm_support(pci_dev
))
795 return pci_legacy_suspend(dev
, PMSG_SUSPEND
);
798 pci_pm_default_suspend(pci_dev
);
803 * PCI devices suspended at run time may need to be resumed at this
804 * point, because in general it may be necessary to reconfigure them for
805 * system suspend. Namely, if the device is expected to wake up the
806 * system from the sleep state, it may have to be reconfigured for this
807 * purpose, or if the device is not expected to wake up the system from
808 * the sleep state, it should be prevented from signaling wakeup events
811 * Also if the driver of the device does not indicate that its system
812 * suspend callbacks can cope with runtime-suspended devices, it is
813 * better to resume the device from runtime suspend here.
815 if (!dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_SUSPEND
) ||
816 pci_dev_need_resume(pci_dev
)) {
817 pm_runtime_resume(dev
);
818 pci_dev
->state_saved
= false;
820 pci_dev_adjust_pme(pci_dev
);
824 pci_power_t prev
= pci_dev
->current_state
;
827 error
= pm
->suspend(dev
);
828 suspend_report_result(dev
, pm
->suspend
, error
);
832 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
833 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
834 pci_WARN_ONCE(pci_dev
, pci_dev
->current_state
!= prev
,
835 "PCI PM: State of device not saved by %pS\n",
843 static int pci_pm_suspend_late(struct device
*dev
)
845 if (dev_pm_skip_suspend(dev
))
848 pci_fixup_device(pci_fixup_suspend
, to_pci_dev(dev
));
850 return pm_generic_suspend_late(dev
);
853 static int pci_pm_suspend_noirq(struct device
*dev
)
855 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
856 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
858 if (dev_pm_skip_suspend(dev
))
861 if (pci_has_legacy_pm_support(pci_dev
))
862 return pci_legacy_suspend_late(dev
);
865 pci_save_state(pci_dev
);
869 if (pm
->suspend_noirq
) {
870 pci_power_t prev
= pci_dev
->current_state
;
873 error
= pm
->suspend_noirq(dev
);
874 suspend_report_result(dev
, pm
->suspend_noirq
, error
);
878 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
879 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
880 pci_WARN_ONCE(pci_dev
, pci_dev
->current_state
!= prev
,
881 "PCI PM: State of device not saved by %pS\n",
887 if (!pci_dev
->state_saved
) {
888 pci_save_state(pci_dev
);
891 * If the device is a bridge with a child in D0 below it,
892 * it needs to stay in D0, so check skip_bus_pm to avoid
893 * putting it into a low-power state in that case.
895 if (!pci_dev
->skip_bus_pm
&& pci_power_manageable(pci_dev
))
896 pci_prepare_to_sleep(pci_dev
);
899 pci_dbg(pci_dev
, "PCI PM: Suspend power state: %s\n",
900 pci_power_name(pci_dev
->current_state
));
902 if (pci_dev
->current_state
== PCI_D0
) {
903 pci_dev
->skip_bus_pm
= true;
905 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
906 * downstream device is in D0, so avoid changing the power state
907 * of the parent bridge by setting the skip_bus_pm flag for it.
909 if (pci_dev
->bus
->self
)
910 pci_dev
->bus
->self
->skip_bus_pm
= true;
913 if (pci_dev
->skip_bus_pm
&& pm_suspend_no_platform()) {
914 pci_dbg(pci_dev
, "PCI PM: Skipped\n");
918 pci_pm_set_unknown_state(pci_dev
);
921 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
922 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
923 * hasn't been quiesced and tries to turn it off. If the controller
924 * is already in D3, this can hang or cause memory corruption.
926 * Since the value of the COMMAND register doesn't matter once the
927 * device has been suspended, we can safely set it to 0 here.
929 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
930 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
933 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
936 * If the target system sleep state is suspend-to-idle, it is sufficient
937 * to check whether or not the device's wakeup settings are good for
938 * runtime PM. Otherwise, the pm_resume_via_firmware() check will cause
939 * pci_pm_complete() to take care of fixing up the device's state
940 * anyway, if need be.
942 if (device_can_wakeup(dev
) && !device_may_wakeup(dev
))
943 dev
->power
.may_skip_resume
= false;
948 static int pci_pm_resume_noirq(struct device
*dev
)
950 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
951 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
952 pci_power_t prev_state
= pci_dev
->current_state
;
953 bool skip_bus_pm
= pci_dev
->skip_bus_pm
;
955 if (dev_pm_skip_resume(dev
))
959 * In the suspend-to-idle case, devices left in D0 during suspend will
960 * stay in D0, so it is not necessary to restore or update their
961 * configuration here and attempting to put them into D0 again is
962 * pointless, so avoid doing that.
964 if (!(skip_bus_pm
&& pm_suspend_no_platform()))
965 pci_pm_default_resume_early(pci_dev
);
967 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
968 pcie_pme_root_status_cleanup(pci_dev
);
970 if (!skip_bus_pm
&& prev_state
== PCI_D3cold
)
971 pci_pm_bridge_power_up_actions(pci_dev
);
973 if (pci_has_legacy_pm_support(pci_dev
))
976 if (pm
&& pm
->resume_noirq
)
977 return pm
->resume_noirq(dev
);
982 static int pci_pm_resume_early(struct device
*dev
)
984 if (dev_pm_skip_resume(dev
))
987 return pm_generic_resume_early(dev
);
990 static int pci_pm_resume(struct device
*dev
)
992 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
993 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
996 * This is necessary for the suspend error path in which resume is
997 * called without restoring the standard config registers of the device.
999 if (pci_dev
->state_saved
)
1000 pci_restore_standard_config(pci_dev
);
1002 pci_resume_ptm(pci_dev
);
1004 if (pci_has_legacy_pm_support(pci_dev
))
1005 return pci_legacy_resume(dev
);
1007 pci_pm_default_resume(pci_dev
);
1011 return pm
->resume(dev
);
1013 pci_pm_reenable_device(pci_dev
);
1019 #else /* !CONFIG_SUSPEND */
1021 #define pci_pm_suspend NULL
1022 #define pci_pm_suspend_late NULL
1023 #define pci_pm_suspend_noirq NULL
1024 #define pci_pm_resume NULL
1025 #define pci_pm_resume_early NULL
1026 #define pci_pm_resume_noirq NULL
1028 #endif /* !CONFIG_SUSPEND */
1030 #ifdef CONFIG_HIBERNATE_CALLBACKS
1032 static int pci_pm_freeze(struct device
*dev
)
1034 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1035 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1037 if (pci_has_legacy_pm_support(pci_dev
))
1038 return pci_legacy_suspend(dev
, PMSG_FREEZE
);
1041 pci_pm_default_suspend(pci_dev
);
1046 * Resume all runtime-suspended devices before creating a snapshot
1047 * image of system memory, because the restore kernel generally cannot
1048 * be expected to always handle them consistently and they need to be
1049 * put into the runtime-active metastate during system resume anyway,
1050 * so it is better to ensure that the state saved in the image will be
1051 * always consistent with that.
1053 pm_runtime_resume(dev
);
1054 pci_dev
->state_saved
= false;
1059 error
= pm
->freeze(dev
);
1060 suspend_report_result(dev
, pm
->freeze
, error
);
1068 static int pci_pm_freeze_noirq(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
;
1073 if (pci_has_legacy_pm_support(pci_dev
))
1074 return pci_legacy_suspend_late(dev
);
1076 if (pm
&& pm
->freeze_noirq
) {
1079 error
= pm
->freeze_noirq(dev
);
1080 suspend_report_result(dev
, pm
->freeze_noirq
, error
);
1085 if (!pci_dev
->state_saved
)
1086 pci_save_state(pci_dev
);
1088 pci_pm_set_unknown_state(pci_dev
);
1093 static int pci_pm_thaw_noirq(struct device
*dev
)
1095 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1096 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1099 * The pm->thaw_noirq() callback assumes the device has been
1100 * returned to D0 and its config state has been restored.
1102 * In addition, pci_restore_state() restores MSI-X state in MMIO
1103 * space, which requires the device to be in D0, so return it to D0
1104 * in case the driver's "freeze" callbacks put it into a low-power
1107 pci_pm_power_up_and_verify_state(pci_dev
);
1108 pci_restore_state(pci_dev
);
1110 if (pci_has_legacy_pm_support(pci_dev
))
1113 if (pm
&& pm
->thaw_noirq
)
1114 return pm
->thaw_noirq(dev
);
1119 static int pci_pm_thaw(struct device
*dev
)
1121 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1122 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1125 if (pci_has_legacy_pm_support(pci_dev
))
1126 return pci_legacy_resume(dev
);
1130 error
= pm
->thaw(dev
);
1132 pci_pm_reenable_device(pci_dev
);
1135 pci_dev
->state_saved
= false;
1140 static int pci_pm_poweroff(struct device
*dev
)
1142 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1143 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1145 if (pci_has_legacy_pm_support(pci_dev
))
1146 return pci_legacy_suspend(dev
, PMSG_HIBERNATE
);
1149 pci_pm_default_suspend(pci_dev
);
1153 /* The reason to do that is the same as in pci_pm_suspend(). */
1154 if (!dev_pm_test_driver_flags(dev
, DPM_FLAG_SMART_SUSPEND
) ||
1155 pci_dev_need_resume(pci_dev
)) {
1156 pm_runtime_resume(dev
);
1157 pci_dev
->state_saved
= false;
1159 pci_dev_adjust_pme(pci_dev
);
1165 error
= pm
->poweroff(dev
);
1166 suspend_report_result(dev
, pm
->poweroff
, error
);
1174 static int pci_pm_poweroff_late(struct device
*dev
)
1176 if (dev_pm_skip_suspend(dev
))
1179 pci_fixup_device(pci_fixup_suspend
, to_pci_dev(dev
));
1181 return pm_generic_poweroff_late(dev
);
1184 static int pci_pm_poweroff_noirq(struct device
*dev
)
1186 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1187 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1189 if (dev_pm_skip_suspend(dev
))
1192 if (pci_has_legacy_pm_support(pci_dev
))
1193 return pci_legacy_suspend_late(dev
);
1196 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
1200 if (pm
->poweroff_noirq
) {
1203 error
= pm
->poweroff_noirq(dev
);
1204 suspend_report_result(dev
, pm
->poweroff_noirq
, error
);
1209 if (!pci_dev
->state_saved
&& !pci_has_subordinate(pci_dev
))
1210 pci_prepare_to_sleep(pci_dev
);
1213 * The reason for doing this here is the same as for the analogous code
1214 * in pci_pm_suspend_noirq().
1216 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
1217 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
1219 pci_fixup_device(pci_fixup_suspend_late
, pci_dev
);
1224 static int pci_pm_restore_noirq(struct device
*dev
)
1226 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1227 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1229 pci_pm_default_resume_early(pci_dev
);
1230 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
1232 if (pci_has_legacy_pm_support(pci_dev
))
1235 if (pm
&& pm
->restore_noirq
)
1236 return pm
->restore_noirq(dev
);
1241 static int pci_pm_restore(struct device
*dev
)
1243 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1244 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1247 * This is necessary for the hibernation error path in which restore is
1248 * called without restoring the standard config registers of the device.
1250 if (pci_dev
->state_saved
)
1251 pci_restore_standard_config(pci_dev
);
1253 if (pci_has_legacy_pm_support(pci_dev
))
1254 return pci_legacy_resume(dev
);
1256 pci_pm_default_resume(pci_dev
);
1260 return pm
->restore(dev
);
1262 pci_pm_reenable_device(pci_dev
);
1268 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1270 #define pci_pm_freeze NULL
1271 #define pci_pm_freeze_noirq NULL
1272 #define pci_pm_thaw NULL
1273 #define pci_pm_thaw_noirq NULL
1274 #define pci_pm_poweroff NULL
1275 #define pci_pm_poweroff_late NULL
1276 #define pci_pm_poweroff_noirq NULL
1277 #define pci_pm_restore NULL
1278 #define pci_pm_restore_noirq NULL
1280 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1284 static int pci_pm_runtime_suspend(struct device
*dev
)
1286 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1287 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1288 pci_power_t prev
= pci_dev
->current_state
;
1291 pci_suspend_ptm(pci_dev
);
1294 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1295 * but it may go to D3cold when the bridge above it runtime suspends.
1296 * Save its config space in case that happens.
1298 if (!pci_dev
->driver
) {
1299 pci_save_state(pci_dev
);
1303 pci_dev
->state_saved
= false;
1304 if (pm
&& pm
->runtime_suspend
) {
1305 error
= pm
->runtime_suspend(dev
);
1307 * -EBUSY and -EAGAIN is used to request the runtime PM core
1308 * to schedule a new suspend, so log the event only with debug
1311 if (error
== -EBUSY
|| error
== -EAGAIN
) {
1312 pci_dbg(pci_dev
, "can't suspend now (%ps returned %d)\n",
1313 pm
->runtime_suspend
, error
);
1316 pci_err(pci_dev
, "can't suspend (%ps returned %d)\n",
1317 pm
->runtime_suspend
, error
);
1322 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
1324 if (pm
&& pm
->runtime_suspend
1325 && !pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
1326 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
1327 pci_WARN_ONCE(pci_dev
, pci_dev
->current_state
!= prev
,
1328 "PCI PM: State of device not saved by %pS\n",
1329 pm
->runtime_suspend
);
1333 if (!pci_dev
->state_saved
) {
1334 pci_save_state(pci_dev
);
1335 pci_finish_runtime_suspend(pci_dev
);
1341 static int pci_pm_runtime_resume(struct device
*dev
)
1343 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1344 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1345 pci_power_t prev_state
= pci_dev
->current_state
;
1349 * Restoring config space is necessary even if the device is not bound
1350 * to a driver because although we left it in D0, it may have gone to
1351 * D3cold when the bridge above it runtime suspended.
1353 pci_pm_default_resume_early(pci_dev
);
1354 pci_resume_ptm(pci_dev
);
1356 if (!pci_dev
->driver
)
1359 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
1360 pci_pm_default_resume(pci_dev
);
1362 if (prev_state
== PCI_D3cold
)
1363 pci_pm_bridge_power_up_actions(pci_dev
);
1365 if (pm
&& pm
->runtime_resume
)
1366 error
= pm
->runtime_resume(dev
);
1371 static int pci_pm_runtime_idle(struct device
*dev
)
1373 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1374 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1377 * If pci_dev->driver is not set (unbound), the device should
1378 * always remain in D0 regardless of the runtime PM status
1380 if (!pci_dev
->driver
)
1383 if (pm
&& pm
->runtime_idle
)
1384 return pm
->runtime_idle(dev
);
1389 static const struct dev_pm_ops pci_dev_pm_ops
= {
1390 .prepare
= pci_pm_prepare
,
1391 .complete
= pci_pm_complete
,
1392 .suspend
= pci_pm_suspend
,
1393 .suspend_late
= pci_pm_suspend_late
,
1394 .resume
= pci_pm_resume
,
1395 .resume_early
= pci_pm_resume_early
,
1396 .freeze
= pci_pm_freeze
,
1397 .thaw
= pci_pm_thaw
,
1398 .poweroff
= pci_pm_poweroff
,
1399 .poweroff_late
= pci_pm_poweroff_late
,
1400 .restore
= pci_pm_restore
,
1401 .suspend_noirq
= pci_pm_suspend_noirq
,
1402 .resume_noirq
= pci_pm_resume_noirq
,
1403 .freeze_noirq
= pci_pm_freeze_noirq
,
1404 .thaw_noirq
= pci_pm_thaw_noirq
,
1405 .poweroff_noirq
= pci_pm_poweroff_noirq
,
1406 .restore_noirq
= pci_pm_restore_noirq
,
1407 .runtime_suspend
= pci_pm_runtime_suspend
,
1408 .runtime_resume
= pci_pm_runtime_resume
,
1409 .runtime_idle
= pci_pm_runtime_idle
,
1412 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1414 #else /* !CONFIG_PM */
1416 #define pci_pm_runtime_suspend NULL
1417 #define pci_pm_runtime_resume NULL
1418 #define pci_pm_runtime_idle NULL
1420 #define PCI_PM_OPS_PTR NULL
1422 #endif /* !CONFIG_PM */
1425 * __pci_register_driver - register a new pci driver
1426 * @drv: the driver structure to register
1427 * @owner: owner module of drv
1428 * @mod_name: module name string
1430 * Adds the driver structure to the list of registered drivers.
1431 * Returns a negative value on error, otherwise 0.
1432 * If no error occurred, the driver remains registered even if
1433 * no device was claimed during registration.
1435 int __pci_register_driver(struct pci_driver
*drv
, struct module
*owner
,
1436 const char *mod_name
)
1438 /* initialize common driver fields */
1439 drv
->driver
.name
= drv
->name
;
1440 drv
->driver
.bus
= &pci_bus_type
;
1441 drv
->driver
.owner
= owner
;
1442 drv
->driver
.mod_name
= mod_name
;
1443 drv
->driver
.groups
= drv
->groups
;
1444 drv
->driver
.dev_groups
= drv
->dev_groups
;
1446 spin_lock_init(&drv
->dynids
.lock
);
1447 INIT_LIST_HEAD(&drv
->dynids
.list
);
1449 /* register with core */
1450 return driver_register(&drv
->driver
);
1452 EXPORT_SYMBOL(__pci_register_driver
);
1455 * pci_unregister_driver - unregister a pci driver
1456 * @drv: the driver structure to unregister
1458 * Deletes the driver structure from the list of registered PCI drivers,
1459 * gives it a chance to clean up by calling its remove() function for
1460 * each device it was responsible for, and marks those devices as
1464 void pci_unregister_driver(struct pci_driver
*drv
)
1466 driver_unregister(&drv
->driver
);
1467 pci_free_dynids(drv
);
1469 EXPORT_SYMBOL(pci_unregister_driver
);
1471 static struct pci_driver pci_compat_driver
= {
1476 * pci_dev_driver - get the pci_driver of a device
1477 * @dev: the device to query
1479 * Returns the appropriate pci_driver structure or %NULL if there is no
1480 * registered driver for the device.
1482 struct pci_driver
*pci_dev_driver(const struct pci_dev
*dev
)
1489 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1490 if (dev
->resource
[i
].flags
& IORESOURCE_BUSY
)
1491 return &pci_compat_driver
;
1495 EXPORT_SYMBOL(pci_dev_driver
);
1498 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1499 * @dev: the PCI device structure to match against
1500 * @drv: the device driver to search for matching PCI device id structures
1502 * Used by a driver to check whether a PCI device present in the
1503 * system is in its list of supported devices. Returns the matching
1504 * pci_device_id structure or %NULL if there is no match.
1506 static int pci_bus_match(struct device
*dev
, const struct device_driver
*drv
)
1508 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1509 struct pci_driver
*pci_drv
;
1510 const struct pci_device_id
*found_id
;
1512 if (!pci_dev
->match_driver
)
1515 pci_drv
= (struct pci_driver
*)to_pci_driver(drv
);
1516 found_id
= pci_match_device(pci_drv
, pci_dev
);
1524 * pci_dev_get - increments the reference count of the pci device structure
1525 * @dev: the device being referenced
1527 * Each live reference to a device should be refcounted.
1529 * Drivers for PCI devices should normally record such references in
1530 * their probe() methods, when they bind to a device, and release
1531 * them by calling pci_dev_put(), in their disconnect() methods.
1533 * A pointer to the device with the incremented reference counter is returned.
1535 struct pci_dev
*pci_dev_get(struct pci_dev
*dev
)
1538 get_device(&dev
->dev
);
1541 EXPORT_SYMBOL(pci_dev_get
);
1544 * pci_dev_put - release a use of the pci device structure
1545 * @dev: device that's been disconnected
1547 * Must be called when a user of a device is finished with it. When the last
1548 * user of the device calls this function, the memory of the device is freed.
1550 void pci_dev_put(struct pci_dev
*dev
)
1553 put_device(&dev
->dev
);
1555 EXPORT_SYMBOL(pci_dev_put
);
1557 static int pci_uevent(const struct device
*dev
, struct kobj_uevent_env
*env
)
1559 const struct pci_dev
*pdev
;
1564 pdev
= to_pci_dev(dev
);
1566 if (add_uevent_var(env
, "PCI_CLASS=%04X", pdev
->class))
1569 if (add_uevent_var(env
, "PCI_ID=%04X:%04X", pdev
->vendor
, pdev
->device
))
1572 if (add_uevent_var(env
, "PCI_SUBSYS_ID=%04X:%04X", pdev
->subsystem_vendor
,
1573 pdev
->subsystem_device
))
1576 if (add_uevent_var(env
, "PCI_SLOT_NAME=%s", pci_name(pdev
)))
1579 if (add_uevent_var(env
, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1580 pdev
->vendor
, pdev
->device
,
1581 pdev
->subsystem_vendor
, pdev
->subsystem_device
,
1582 (u8
)(pdev
->class >> 16), (u8
)(pdev
->class >> 8),
1589 #if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1591 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1592 * @pdev: PCI device undergoing error recovery
1593 * @err_type: type of error event
1595 void pci_uevent_ers(struct pci_dev
*pdev
, enum pci_ers_result err_type
)
1601 case PCI_ERS_RESULT_NONE
:
1602 case PCI_ERS_RESULT_CAN_RECOVER
:
1603 envp
[idx
++] = "ERROR_EVENT=BEGIN_RECOVERY";
1604 envp
[idx
++] = "DEVICE_ONLINE=0";
1606 case PCI_ERS_RESULT_RECOVERED
:
1607 envp
[idx
++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1608 envp
[idx
++] = "DEVICE_ONLINE=1";
1610 case PCI_ERS_RESULT_DISCONNECT
:
1611 envp
[idx
++] = "ERROR_EVENT=FAILED_RECOVERY";
1612 envp
[idx
++] = "DEVICE_ONLINE=0";
1620 kobject_uevent_env(&pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
1625 static int pci_bus_num_vf(struct device
*dev
)
1627 return pci_num_vf(to_pci_dev(dev
));
1631 * pci_dma_configure - Setup DMA configuration
1632 * @dev: ptr to dev structure
1634 * Function to update PCI devices's DMA configuration using the same
1635 * info from the OF node or ACPI node of host bridge's parent (if any).
1637 static int pci_dma_configure(struct device
*dev
)
1639 struct pci_driver
*driver
= to_pci_driver(dev
->driver
);
1640 struct device
*bridge
;
1643 bridge
= pci_get_host_bridge_device(to_pci_dev(dev
));
1645 if (IS_ENABLED(CONFIG_OF
) && bridge
->parent
&&
1646 bridge
->parent
->of_node
) {
1647 ret
= of_dma_configure(dev
, bridge
->parent
->of_node
, true);
1648 } else if (has_acpi_companion(bridge
)) {
1649 struct acpi_device
*adev
= to_acpi_device_node(bridge
->fwnode
);
1651 ret
= acpi_dma_configure(dev
, acpi_get_dma_attr(adev
));
1654 pci_put_host_bridge_device(bridge
);
1656 if (!ret
&& !driver
->driver_managed_dma
) {
1657 ret
= iommu_device_use_default_domain(dev
);
1659 arch_teardown_dma_ops(dev
);
1665 static void pci_dma_cleanup(struct device
*dev
)
1667 struct pci_driver
*driver
= to_pci_driver(dev
->driver
);
1669 if (!driver
->driver_managed_dma
)
1670 iommu_device_unuse_default_domain(dev
);
1673 const struct bus_type pci_bus_type
= {
1675 .match
= pci_bus_match
,
1676 .uevent
= pci_uevent
,
1677 .probe
= pci_device_probe
,
1678 .remove
= pci_device_remove
,
1679 .shutdown
= pci_device_shutdown
,
1680 .dev_groups
= pci_dev_groups
,
1681 .bus_groups
= pci_bus_groups
,
1682 .drv_groups
= pci_drv_groups
,
1683 .pm
= PCI_PM_OPS_PTR
,
1684 .num_vf
= pci_bus_num_vf
,
1685 .dma_configure
= pci_dma_configure
,
1686 .dma_cleanup
= pci_dma_cleanup
,
1688 EXPORT_SYMBOL(pci_bus_type
);
1690 #ifdef CONFIG_PCIEPORTBUS
1691 static int pcie_port_bus_match(struct device
*dev
, const struct device_driver
*drv
)
1693 struct pcie_device
*pciedev
;
1694 const struct pcie_port_service_driver
*driver
;
1696 if (drv
->bus
!= &pcie_port_bus_type
|| dev
->bus
!= &pcie_port_bus_type
)
1699 pciedev
= to_pcie_device(dev
);
1700 driver
= to_service_driver(drv
);
1702 if (driver
->service
!= pciedev
->service
)
1705 if (driver
->port_type
!= PCIE_ANY_PORT
&&
1706 driver
->port_type
!= pci_pcie_type(pciedev
->port
))
1712 const struct bus_type pcie_port_bus_type
= {
1713 .name
= "pci_express",
1714 .match
= pcie_port_bus_match
,
1718 static int __init
pci_driver_init(void)
1722 ret
= bus_register(&pci_bus_type
);
1726 #ifdef CONFIG_PCIEPORTBUS
1727 ret
= bus_register(&pcie_port_bus_type
);
1731 dma_debug_add_bus(&pci_bus_type
);
1734 postcore_initcall(pci_driver_init
);