2 * drivers/pci/pci-driver.c
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
7 * Released under the GPL v2 only.
11 #include <linux/pci.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/mempolicy.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
19 #include <linux/cpu.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/suspend.h>
22 #include <linux/kexec.h>
26 struct list_head node
;
27 struct pci_device_id id
;
31 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
32 * @drv: target pci driver
33 * @vendor: PCI vendor ID
34 * @device: PCI device ID
35 * @subvendor: PCI subvendor ID
36 * @subdevice: PCI subdevice ID
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
41 * Adds a new dynamic pci device ID to this driver and causes the
42 * driver to probe for all devices again. @drv must have been
43 * registered prior to calling this function.
46 * Does GFP_KERNEL allocation.
49 * 0 on success, -errno on failure.
51 int pci_add_dynid(struct pci_driver
*drv
,
52 unsigned int vendor
, unsigned int device
,
53 unsigned int subvendor
, unsigned int subdevice
,
54 unsigned int class, unsigned int class_mask
,
55 unsigned long driver_data
)
57 struct pci_dynid
*dynid
;
60 dynid
= kzalloc(sizeof(*dynid
), GFP_KERNEL
);
64 dynid
->id
.vendor
= vendor
;
65 dynid
->id
.device
= device
;
66 dynid
->id
.subvendor
= subvendor
;
67 dynid
->id
.subdevice
= subdevice
;
68 dynid
->id
.class = class;
69 dynid
->id
.class_mask
= class_mask
;
70 dynid
->id
.driver_data
= driver_data
;
72 spin_lock(&drv
->dynids
.lock
);
73 list_add_tail(&dynid
->node
, &drv
->dynids
.list
);
74 spin_unlock(&drv
->dynids
.lock
);
76 retval
= driver_attach(&drv
->driver
);
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 * store_new_id - sysfs frontend to pci_add_dynid()
95 * @driver: target device driver
96 * @buf: buffer for scanning device ID data
99 * Allow PCI IDs to be added to an existing driver via sysfs.
102 store_new_id(struct device_driver
*driver
, const char *buf
, size_t count
)
104 struct pci_driver
*pdrv
= to_pci_driver(driver
);
105 const struct pci_device_id
*ids
= pdrv
->id_table
;
106 __u32 vendor
, device
, subvendor
=PCI_ANY_ID
,
107 subdevice
=PCI_ANY_ID
, class=0, class_mask
=0;
108 unsigned long driver_data
=0;
112 fields
= sscanf(buf
, "%x %x %x %x %x %x %lx",
113 &vendor
, &device
, &subvendor
, &subdevice
,
114 &class, &class_mask
, &driver_data
);
119 struct pci_dev
*pdev
= kzalloc(sizeof(*pdev
), GFP_KERNEL
);
123 pdev
->vendor
= vendor
;
124 pdev
->device
= device
;
125 pdev
->subsystem_vendor
= subvendor
;
126 pdev
->subsystem_device
= subdevice
;
129 if (pci_match_id(pdrv
->id_table
, pdev
))
138 /* Only accept driver_data values that match an existing id_table
142 while (ids
->vendor
|| ids
->subvendor
|| ids
->class_mask
) {
143 if (driver_data
== ids
->driver_data
) {
149 if (retval
) /* No match */
153 retval
= pci_add_dynid(pdrv
, vendor
, device
, subvendor
, subdevice
,
154 class, class_mask
, driver_data
);
159 static DRIVER_ATTR(new_id
, S_IWUSR
, NULL
, store_new_id
);
162 * store_remove_id - remove a PCI device ID from this driver
163 * @driver: target device driver
164 * @buf: buffer for scanning device ID data
167 * Removes a dynamic pci device ID to this driver.
170 store_remove_id(struct device_driver
*driver
, const char *buf
, size_t count
)
172 struct pci_dynid
*dynid
, *n
;
173 struct pci_driver
*pdrv
= to_pci_driver(driver
);
174 __u32 vendor
, device
, subvendor
= PCI_ANY_ID
,
175 subdevice
= PCI_ANY_ID
, class = 0, class_mask
= 0;
177 int retval
= -ENODEV
;
179 fields
= sscanf(buf
, "%x %x %x %x %x %x",
180 &vendor
, &device
, &subvendor
, &subdevice
,
181 &class, &class_mask
);
185 spin_lock(&pdrv
->dynids
.lock
);
186 list_for_each_entry_safe(dynid
, n
, &pdrv
->dynids
.list
, node
) {
187 struct pci_device_id
*id
= &dynid
->id
;
188 if ((id
->vendor
== vendor
) &&
189 (id
->device
== device
) &&
190 (subvendor
== PCI_ANY_ID
|| id
->subvendor
== subvendor
) &&
191 (subdevice
== PCI_ANY_ID
|| id
->subdevice
== subdevice
) &&
192 !((id
->class ^ class) & class_mask
)) {
193 list_del(&dynid
->node
);
199 spin_unlock(&pdrv
->dynids
.lock
);
205 static DRIVER_ATTR(remove_id
, S_IWUSR
, NULL
, store_remove_id
);
207 static struct attribute
*pci_drv_attrs
[] = {
208 &driver_attr_new_id
.attr
,
209 &driver_attr_remove_id
.attr
,
212 ATTRIBUTE_GROUPS(pci_drv
);
215 * pci_match_id - See if a pci device matches a given pci_id table
216 * @ids: array of PCI device id structures to search in
217 * @dev: the PCI device structure to match against.
219 * Used by a driver to check whether a PCI device present in the
220 * system is in its list of supported devices. Returns the matching
221 * pci_device_id structure or %NULL if there is no match.
223 * Deprecated, don't use this as it will not catch any dynamic ids
224 * that a driver might want to check for.
226 const struct pci_device_id
*pci_match_id(const struct pci_device_id
*ids
,
230 while (ids
->vendor
|| ids
->subvendor
|| ids
->class_mask
) {
231 if (pci_match_one_device(ids
, dev
))
240 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
241 * @drv: the PCI driver to match against
242 * @dev: the PCI device structure to match against
244 * Used by a driver to check whether a PCI device present in the
245 * system is in its list of supported devices. Returns the matching
246 * pci_device_id structure or %NULL if there is no match.
248 static const struct pci_device_id
*pci_match_device(struct pci_driver
*drv
,
251 struct pci_dynid
*dynid
;
253 /* Look at the dynamic ids first, before the static ones */
254 spin_lock(&drv
->dynids
.lock
);
255 list_for_each_entry(dynid
, &drv
->dynids
.list
, node
) {
256 if (pci_match_one_device(&dynid
->id
, dev
)) {
257 spin_unlock(&drv
->dynids
.lock
);
261 spin_unlock(&drv
->dynids
.lock
);
263 return pci_match_id(drv
->id_table
, dev
);
266 struct drv_dev_and_id
{
267 struct pci_driver
*drv
;
269 const struct pci_device_id
*id
;
272 static long local_pci_probe(void *_ddi
)
274 struct drv_dev_and_id
*ddi
= _ddi
;
275 struct pci_dev
*pci_dev
= ddi
->dev
;
276 struct pci_driver
*pci_drv
= ddi
->drv
;
277 struct device
*dev
= &pci_dev
->dev
;
281 * Unbound PCI devices are always put in D0, regardless of
282 * runtime PM status. During probe, the device is set to
283 * active and the usage count is incremented. If the driver
284 * supports runtime PM, it should call pm_runtime_put_noidle()
285 * in its probe routine and pm_runtime_get_noresume() in its
288 pm_runtime_get_sync(dev
);
289 pci_dev
->driver
= pci_drv
;
290 rc
= pci_drv
->probe(pci_dev
, ddi
->id
);
294 pci_dev
->driver
= NULL
;
295 pm_runtime_put_sync(dev
);
299 * Probe function should return < 0 for failure, 0 for success
300 * Treat values > 0 as success, but warn.
302 dev_warn(dev
, "Driver probe function unexpectedly returned %d\n", rc
);
306 static int pci_call_probe(struct pci_driver
*drv
, struct pci_dev
*dev
,
307 const struct pci_device_id
*id
)
310 struct drv_dev_and_id ddi
= { drv
, dev
, id
};
313 * Execute driver initialization on node where the device is
314 * attached. This way the driver likely allocates its local memory
317 node
= dev_to_node(&dev
->dev
);
320 * On NUMA systems, we are likely to call a PF probe function using
321 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
322 * adds the VF devices via pci_bus_add_device()), we may re-enter
323 * this function to call the VF probe function. Calling
324 * work_on_cpu() again will cause a lockdep warning. Since VFs are
325 * always on the same node as the PF, we can work around this by
326 * avoiding work_on_cpu() when we're already on the correct node.
328 * Preemption is enabled, so it's theoretically unsafe to use
329 * numa_node_id(), but even if we run the probe function on the
330 * wrong node, it should be functionally correct.
332 if (node
>= 0 && node
!= numa_node_id()) {
336 cpu
= cpumask_any_and(cpumask_of_node(node
), cpu_online_mask
);
337 if (cpu
< nr_cpu_ids
)
338 error
= work_on_cpu(cpu
, local_pci_probe
, &ddi
);
340 error
= local_pci_probe(&ddi
);
343 error
= local_pci_probe(&ddi
);
349 * __pci_device_probe - check if a driver wants to claim a specific PCI device
350 * @drv: driver to call to check if it wants the PCI device
351 * @pci_dev: PCI device being probed
353 * returns 0 on success, else error.
354 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
357 __pci_device_probe(struct pci_driver
*drv
, struct pci_dev
*pci_dev
)
359 const struct pci_device_id
*id
;
362 if (!pci_dev
->driver
&& drv
->probe
) {
365 id
= pci_match_device(drv
, pci_dev
);
367 error
= pci_call_probe(drv
, pci_dev
, id
);
374 static int pci_device_probe(struct device
* dev
)
377 struct pci_driver
*drv
;
378 struct pci_dev
*pci_dev
;
380 drv
= to_pci_driver(dev
->driver
);
381 pci_dev
= to_pci_dev(dev
);
382 pci_dev_get(pci_dev
);
383 error
= __pci_device_probe(drv
, pci_dev
);
385 pci_dev_put(pci_dev
);
390 static int pci_device_remove(struct device
* dev
)
392 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
393 struct pci_driver
* drv
= pci_dev
->driver
;
397 pm_runtime_get_sync(dev
);
398 drv
->remove(pci_dev
);
399 pm_runtime_put_noidle(dev
);
401 pci_dev
->driver
= NULL
;
404 /* Undo the runtime PM settings in local_pci_probe() */
405 pm_runtime_put_sync(dev
);
408 * If the device is still on, set the power state as "unknown",
409 * since it might change by the next time we load the driver.
411 if (pci_dev
->current_state
== PCI_D0
)
412 pci_dev
->current_state
= PCI_UNKNOWN
;
415 * We would love to complain here if pci_dev->is_enabled is set, that
416 * the driver should have called pci_disable_device(), but the
417 * unfortunate fact is there are too many odd BIOS and bridge setups
418 * that don't like drivers doing that all of the time.
419 * Oh well, we can dream of sane hardware when we sleep, no matter how
420 * horrible the crap we have to deal with is when we are awake...
423 pci_dev_put(pci_dev
);
427 static void pci_device_shutdown(struct device
*dev
)
429 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
430 struct pci_driver
*drv
= pci_dev
->driver
;
432 pm_runtime_resume(dev
);
434 if (drv
&& drv
->shutdown
)
435 drv
->shutdown(pci_dev
);
436 pci_msi_shutdown(pci_dev
);
437 pci_msix_shutdown(pci_dev
);
441 * If this is a kexec reboot, turn off Bus Master bit on the
442 * device to tell it to not continue to do DMA. Don't touch
443 * devices in D3cold or unknown states.
444 * If it is not a kexec reboot, firmware will hit the PCI
445 * devices with big hammer and stop their DMA any way.
447 if (kexec_in_progress
&& (pci_dev
->current_state
<= PCI_D3hot
))
448 pci_clear_master(pci_dev
);
454 /* Auxiliary functions used for system resume and run-time resume. */
457 * pci_restore_standard_config - restore standard config registers of PCI device
458 * @pci_dev: PCI device to handle
460 static int pci_restore_standard_config(struct pci_dev
*pci_dev
)
462 pci_update_current_state(pci_dev
, PCI_UNKNOWN
);
464 if (pci_dev
->current_state
!= PCI_D0
) {
465 int error
= pci_set_power_state(pci_dev
, PCI_D0
);
470 pci_restore_state(pci_dev
);
476 #ifdef CONFIG_PM_SLEEP
478 static void pci_pm_default_resume_early(struct pci_dev
*pci_dev
)
480 pci_power_up(pci_dev
);
481 pci_restore_state(pci_dev
);
482 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
486 * Default "suspend" method for devices that have no driver provided suspend,
487 * or not even a driver at all (second part).
489 static void pci_pm_set_unknown_state(struct pci_dev
*pci_dev
)
492 * mark its power state as "unknown", since we don't know if
493 * e.g. the BIOS will change its device state when we suspend.
495 if (pci_dev
->current_state
== PCI_D0
)
496 pci_dev
->current_state
= PCI_UNKNOWN
;
500 * Default "resume" method for devices that have no driver provided resume,
501 * or not even a driver at all (second part).
503 static int pci_pm_reenable_device(struct pci_dev
*pci_dev
)
507 /* if the device was enabled before suspend, reenable */
508 retval
= pci_reenable_device(pci_dev
);
510 * if the device was busmaster before the suspend, make it busmaster
513 if (pci_dev
->is_busmaster
)
514 pci_set_master(pci_dev
);
519 static int pci_legacy_suspend(struct device
*dev
, pm_message_t state
)
521 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
522 struct pci_driver
* drv
= pci_dev
->driver
;
524 if (drv
&& drv
->suspend
) {
525 pci_power_t prev
= pci_dev
->current_state
;
528 error
= drv
->suspend(pci_dev
, state
);
529 suspend_report_result(drv
->suspend
, error
);
533 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
534 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
535 WARN_ONCE(pci_dev
->current_state
!= prev
,
536 "PCI PM: Device state not saved by %pF\n",
541 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
546 static int pci_legacy_suspend_late(struct device
*dev
, pm_message_t state
)
548 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
549 struct pci_driver
* drv
= pci_dev
->driver
;
551 if (drv
&& drv
->suspend_late
) {
552 pci_power_t prev
= pci_dev
->current_state
;
555 error
= drv
->suspend_late(pci_dev
, state
);
556 suspend_report_result(drv
->suspend_late
, error
);
560 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
561 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
562 WARN_ONCE(pci_dev
->current_state
!= prev
,
563 "PCI PM: Device state not saved by %pF\n",
569 if (!pci_dev
->state_saved
)
570 pci_save_state(pci_dev
);
572 pci_pm_set_unknown_state(pci_dev
);
577 static int pci_legacy_resume_early(struct device
*dev
)
579 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
580 struct pci_driver
* drv
= pci_dev
->driver
;
582 return drv
&& drv
->resume_early
?
583 drv
->resume_early(pci_dev
) : 0;
586 static int pci_legacy_resume(struct device
*dev
)
588 struct pci_dev
* pci_dev
= to_pci_dev(dev
);
589 struct pci_driver
* drv
= pci_dev
->driver
;
591 pci_fixup_device(pci_fixup_resume
, pci_dev
);
593 return drv
&& drv
->resume
?
594 drv
->resume(pci_dev
) : pci_pm_reenable_device(pci_dev
);
597 /* Auxiliary functions used by the new power management framework */
599 static void pci_pm_default_resume(struct pci_dev
*pci_dev
)
601 pci_fixup_device(pci_fixup_resume
, pci_dev
);
603 if (!pci_is_bridge(pci_dev
))
604 pci_enable_wake(pci_dev
, PCI_D0
, false);
607 static void pci_pm_default_suspend(struct pci_dev
*pci_dev
)
609 /* Disable non-bridge devices without PM support */
610 if (!pci_is_bridge(pci_dev
))
611 pci_disable_enabled_device(pci_dev
);
614 static bool pci_has_legacy_pm_support(struct pci_dev
*pci_dev
)
616 struct pci_driver
*drv
= pci_dev
->driver
;
617 bool ret
= drv
&& (drv
->suspend
|| drv
->suspend_late
|| drv
->resume
618 || drv
->resume_early
);
621 * Legacy PM support is used by default, so warn if the new framework is
622 * supported as well. Drivers are supposed to support either the
623 * former, or the latter, but not both at the same time.
625 WARN(ret
&& drv
->driver
.pm
, "driver %s device %04x:%04x\n",
626 drv
->name
, pci_dev
->vendor
, pci_dev
->device
);
631 /* New power management framework */
633 static int pci_pm_prepare(struct device
*dev
)
635 struct device_driver
*drv
= dev
->driver
;
639 * Devices having power.ignore_children set may still be necessary for
640 * suspending their children in the next phase of device suspend.
642 if (dev
->power
.ignore_children
)
643 pm_runtime_resume(dev
);
645 if (drv
&& drv
->pm
&& drv
->pm
->prepare
)
646 error
= drv
->pm
->prepare(dev
);
652 #else /* !CONFIG_PM_SLEEP */
654 #define pci_pm_prepare NULL
656 #endif /* !CONFIG_PM_SLEEP */
658 #ifdef CONFIG_SUSPEND
660 static int pci_pm_suspend(struct device
*dev
)
662 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
663 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
665 if (pci_has_legacy_pm_support(pci_dev
))
666 return pci_legacy_suspend(dev
, PMSG_SUSPEND
);
669 pci_pm_default_suspend(pci_dev
);
674 * PCI devices suspended at run time need to be resumed at this point,
675 * because in general it is necessary to reconfigure them for system
676 * suspend. Namely, if the device is supposed to wake up the system
677 * from the sleep state, we may need to reconfigure it for this purpose.
678 * In turn, if the device is not supposed to wake up the system from the
679 * sleep state, we'll have to prevent it from signaling wake-up.
681 pm_runtime_resume(dev
);
683 pci_dev
->state_saved
= false;
685 pci_power_t prev
= pci_dev
->current_state
;
688 error
= pm
->suspend(dev
);
689 suspend_report_result(pm
->suspend
, error
);
693 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
694 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
695 WARN_ONCE(pci_dev
->current_state
!= prev
,
696 "PCI PM: State of device not saved by %pF\n",
702 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
707 static int pci_pm_suspend_noirq(struct device
*dev
)
709 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
710 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
712 if (pci_has_legacy_pm_support(pci_dev
))
713 return pci_legacy_suspend_late(dev
, PMSG_SUSPEND
);
716 pci_save_state(pci_dev
);
720 if (pm
->suspend_noirq
) {
721 pci_power_t prev
= pci_dev
->current_state
;
724 error
= pm
->suspend_noirq(dev
);
725 suspend_report_result(pm
->suspend_noirq
, error
);
729 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
730 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
731 WARN_ONCE(pci_dev
->current_state
!= prev
,
732 "PCI PM: State of device not saved by %pF\n",
738 if (!pci_dev
->state_saved
) {
739 pci_save_state(pci_dev
);
740 if (!pci_is_bridge(pci_dev
))
741 pci_prepare_to_sleep(pci_dev
);
744 pci_pm_set_unknown_state(pci_dev
);
747 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
748 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
749 * hasn't been quiesced and tries to turn it off. If the controller
750 * is already in D3, this can hang or cause memory corruption.
752 * Since the value of the COMMAND register doesn't matter once the
753 * device has been suspended, we can safely set it to 0 here.
755 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
756 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
761 static int pci_pm_resume_noirq(struct device
*dev
)
763 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
764 struct device_driver
*drv
= dev
->driver
;
767 pci_pm_default_resume_early(pci_dev
);
769 if (pci_has_legacy_pm_support(pci_dev
))
770 return pci_legacy_resume_early(dev
);
772 if (drv
&& drv
->pm
&& drv
->pm
->resume_noirq
)
773 error
= drv
->pm
->resume_noirq(dev
);
778 static int pci_pm_resume(struct device
*dev
)
780 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
781 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
785 * This is necessary for the suspend error path in which resume is
786 * called without restoring the standard config registers of the device.
788 if (pci_dev
->state_saved
)
789 pci_restore_standard_config(pci_dev
);
791 if (pci_has_legacy_pm_support(pci_dev
))
792 return pci_legacy_resume(dev
);
794 pci_pm_default_resume(pci_dev
);
798 error
= pm
->resume(dev
);
800 pci_pm_reenable_device(pci_dev
);
806 #else /* !CONFIG_SUSPEND */
808 #define pci_pm_suspend NULL
809 #define pci_pm_suspend_noirq NULL
810 #define pci_pm_resume NULL
811 #define pci_pm_resume_noirq NULL
813 #endif /* !CONFIG_SUSPEND */
815 #ifdef CONFIG_HIBERNATE_CALLBACKS
819 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
820 * a hibernate transition
822 struct dev_pm_ops __weak pcibios_pm_ops
;
824 static int pci_pm_freeze(struct device
*dev
)
826 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
827 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
829 if (pci_has_legacy_pm_support(pci_dev
))
830 return pci_legacy_suspend(dev
, PMSG_FREEZE
);
833 pci_pm_default_suspend(pci_dev
);
838 * This used to be done in pci_pm_prepare() for all devices and some
839 * drivers may depend on it, so do it here. Ideally, runtime-suspended
840 * devices should not be touched during freeze/thaw transitions,
843 pm_runtime_resume(dev
);
845 pci_dev
->state_saved
= false;
849 error
= pm
->freeze(dev
);
850 suspend_report_result(pm
->freeze
, error
);
855 if (pcibios_pm_ops
.freeze
)
856 return pcibios_pm_ops
.freeze(dev
);
861 static int pci_pm_freeze_noirq(struct device
*dev
)
863 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
864 struct device_driver
*drv
= dev
->driver
;
866 if (pci_has_legacy_pm_support(pci_dev
))
867 return pci_legacy_suspend_late(dev
, PMSG_FREEZE
);
869 if (drv
&& drv
->pm
&& drv
->pm
->freeze_noirq
) {
872 error
= drv
->pm
->freeze_noirq(dev
);
873 suspend_report_result(drv
->pm
->freeze_noirq
, error
);
878 if (!pci_dev
->state_saved
)
879 pci_save_state(pci_dev
);
881 pci_pm_set_unknown_state(pci_dev
);
883 if (pcibios_pm_ops
.freeze_noirq
)
884 return pcibios_pm_ops
.freeze_noirq(dev
);
889 static int pci_pm_thaw_noirq(struct device
*dev
)
891 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
892 struct device_driver
*drv
= dev
->driver
;
895 if (pcibios_pm_ops
.thaw_noirq
) {
896 error
= pcibios_pm_ops
.thaw_noirq(dev
);
901 if (pci_has_legacy_pm_support(pci_dev
))
902 return pci_legacy_resume_early(dev
);
904 pci_update_current_state(pci_dev
, PCI_D0
);
906 if (drv
&& drv
->pm
&& drv
->pm
->thaw_noirq
)
907 error
= drv
->pm
->thaw_noirq(dev
);
912 static int pci_pm_thaw(struct device
*dev
)
914 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
915 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
918 if (pcibios_pm_ops
.thaw
) {
919 error
= pcibios_pm_ops
.thaw(dev
);
924 if (pci_has_legacy_pm_support(pci_dev
))
925 return pci_legacy_resume(dev
);
929 error
= pm
->thaw(dev
);
931 pci_pm_reenable_device(pci_dev
);
934 pci_dev
->state_saved
= false;
939 static int pci_pm_poweroff(struct device
*dev
)
941 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
942 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
944 if (pci_has_legacy_pm_support(pci_dev
))
945 return pci_legacy_suspend(dev
, PMSG_HIBERNATE
);
948 pci_pm_default_suspend(pci_dev
);
952 /* The reason to do that is the same as in pci_pm_suspend(). */
953 pm_runtime_resume(dev
);
955 pci_dev
->state_saved
= false;
959 error
= pm
->poweroff(dev
);
960 suspend_report_result(pm
->poweroff
, error
);
966 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
968 if (pcibios_pm_ops
.poweroff
)
969 return pcibios_pm_ops
.poweroff(dev
);
974 static int pci_pm_poweroff_noirq(struct device
*dev
)
976 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
977 struct device_driver
*drv
= dev
->driver
;
979 if (pci_has_legacy_pm_support(to_pci_dev(dev
)))
980 return pci_legacy_suspend_late(dev
, PMSG_HIBERNATE
);
982 if (!drv
|| !drv
->pm
)
985 if (drv
->pm
->poweroff_noirq
) {
988 error
= drv
->pm
->poweroff_noirq(dev
);
989 suspend_report_result(drv
->pm
->poweroff_noirq
, error
);
994 if (!pci_dev
->state_saved
&& !pci_is_bridge(pci_dev
))
995 pci_prepare_to_sleep(pci_dev
);
998 * The reason for doing this here is the same as for the analogous code
999 * in pci_pm_suspend_noirq().
1001 if (pci_dev
->class == PCI_CLASS_SERIAL_USB_EHCI
)
1002 pci_write_config_word(pci_dev
, PCI_COMMAND
, 0);
1004 if (pcibios_pm_ops
.poweroff_noirq
)
1005 return pcibios_pm_ops
.poweroff_noirq(dev
);
1010 static int pci_pm_restore_noirq(struct device
*dev
)
1012 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1013 struct device_driver
*drv
= dev
->driver
;
1016 if (pcibios_pm_ops
.restore_noirq
) {
1017 error
= pcibios_pm_ops
.restore_noirq(dev
);
1022 pci_pm_default_resume_early(pci_dev
);
1024 if (pci_has_legacy_pm_support(pci_dev
))
1025 return pci_legacy_resume_early(dev
);
1027 if (drv
&& drv
->pm
&& drv
->pm
->restore_noirq
)
1028 error
= drv
->pm
->restore_noirq(dev
);
1033 static int pci_pm_restore(struct device
*dev
)
1035 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1036 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1039 if (pcibios_pm_ops
.restore
) {
1040 error
= pcibios_pm_ops
.restore(dev
);
1046 * This is necessary for the hibernation error path in which restore is
1047 * called without restoring the standard config registers of the device.
1049 if (pci_dev
->state_saved
)
1050 pci_restore_standard_config(pci_dev
);
1052 if (pci_has_legacy_pm_support(pci_dev
))
1053 return pci_legacy_resume(dev
);
1055 pci_pm_default_resume(pci_dev
);
1059 error
= pm
->restore(dev
);
1061 pci_pm_reenable_device(pci_dev
);
1067 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1069 #define pci_pm_freeze NULL
1070 #define pci_pm_freeze_noirq NULL
1071 #define pci_pm_thaw NULL
1072 #define pci_pm_thaw_noirq NULL
1073 #define pci_pm_poweroff NULL
1074 #define pci_pm_poweroff_noirq NULL
1075 #define pci_pm_restore NULL
1076 #define pci_pm_restore_noirq NULL
1078 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1080 #ifdef CONFIG_PM_RUNTIME
1082 static int pci_pm_runtime_suspend(struct device
*dev
)
1084 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1085 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1086 pci_power_t prev
= pci_dev
->current_state
;
1090 * If pci_dev->driver is not set (unbound), the device should
1091 * always remain in D0 regardless of the runtime PM status
1093 if (!pci_dev
->driver
)
1096 if (!pm
|| !pm
->runtime_suspend
)
1099 pci_dev
->state_saved
= false;
1100 pci_dev
->no_d3cold
= false;
1101 error
= pm
->runtime_suspend(dev
);
1102 suspend_report_result(pm
->runtime_suspend
, error
);
1105 if (!pci_dev
->d3cold_allowed
)
1106 pci_dev
->no_d3cold
= true;
1108 pci_fixup_device(pci_fixup_suspend
, pci_dev
);
1110 if (!pci_dev
->state_saved
&& pci_dev
->current_state
!= PCI_D0
1111 && pci_dev
->current_state
!= PCI_UNKNOWN
) {
1112 WARN_ONCE(pci_dev
->current_state
!= prev
,
1113 "PCI PM: State of device not saved by %pF\n",
1114 pm
->runtime_suspend
);
1118 if (!pci_dev
->state_saved
) {
1119 pci_save_state(pci_dev
);
1120 pci_finish_runtime_suspend(pci_dev
);
1126 static int pci_pm_runtime_resume(struct device
*dev
)
1129 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1130 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1133 * If pci_dev->driver is not set (unbound), the device should
1134 * always remain in D0 regardless of the runtime PM status
1136 if (!pci_dev
->driver
)
1139 if (!pm
|| !pm
->runtime_resume
)
1142 pci_restore_standard_config(pci_dev
);
1143 pci_fixup_device(pci_fixup_resume_early
, pci_dev
);
1144 __pci_enable_wake(pci_dev
, PCI_D0
, true, false);
1145 pci_fixup_device(pci_fixup_resume
, pci_dev
);
1147 rc
= pm
->runtime_resume(dev
);
1149 pci_dev
->runtime_d3cold
= false;
1154 static int pci_pm_runtime_idle(struct device
*dev
)
1156 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1157 const struct dev_pm_ops
*pm
= dev
->driver
? dev
->driver
->pm
: NULL
;
1161 * If pci_dev->driver is not set (unbound), the device should
1162 * always remain in D0 regardless of the runtime PM status
1164 if (!pci_dev
->driver
)
1170 if (pm
->runtime_idle
)
1171 ret
= pm
->runtime_idle(dev
);
1176 #else /* !CONFIG_PM_RUNTIME */
1178 #define pci_pm_runtime_suspend NULL
1179 #define pci_pm_runtime_resume NULL
1180 #define pci_pm_runtime_idle NULL
1182 #endif /* !CONFIG_PM_RUNTIME */
1186 static const struct dev_pm_ops pci_dev_pm_ops
= {
1187 .prepare
= pci_pm_prepare
,
1188 .suspend
= pci_pm_suspend
,
1189 .resume
= pci_pm_resume
,
1190 .freeze
= pci_pm_freeze
,
1191 .thaw
= pci_pm_thaw
,
1192 .poweroff
= pci_pm_poweroff
,
1193 .restore
= pci_pm_restore
,
1194 .suspend_noirq
= pci_pm_suspend_noirq
,
1195 .resume_noirq
= pci_pm_resume_noirq
,
1196 .freeze_noirq
= pci_pm_freeze_noirq
,
1197 .thaw_noirq
= pci_pm_thaw_noirq
,
1198 .poweroff_noirq
= pci_pm_poweroff_noirq
,
1199 .restore_noirq
= pci_pm_restore_noirq
,
1200 .runtime_suspend
= pci_pm_runtime_suspend
,
1201 .runtime_resume
= pci_pm_runtime_resume
,
1202 .runtime_idle
= pci_pm_runtime_idle
,
1205 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1207 #else /* !COMFIG_PM_OPS */
1209 #define PCI_PM_OPS_PTR NULL
1211 #endif /* !COMFIG_PM_OPS */
1214 * __pci_register_driver - register a new pci driver
1215 * @drv: the driver structure to register
1216 * @owner: owner module of drv
1217 * @mod_name: module name string
1219 * Adds the driver structure to the list of registered drivers.
1220 * Returns a negative value on error, otherwise 0.
1221 * If no error occurred, the driver remains registered even if
1222 * no device was claimed during registration.
1224 int __pci_register_driver(struct pci_driver
*drv
, struct module
*owner
,
1225 const char *mod_name
)
1227 /* initialize common driver fields */
1228 drv
->driver
.name
= drv
->name
;
1229 drv
->driver
.bus
= &pci_bus_type
;
1230 drv
->driver
.owner
= owner
;
1231 drv
->driver
.mod_name
= mod_name
;
1233 spin_lock_init(&drv
->dynids
.lock
);
1234 INIT_LIST_HEAD(&drv
->dynids
.list
);
1236 /* register with core */
1237 return driver_register(&drv
->driver
);
1241 * pci_unregister_driver - unregister a pci driver
1242 * @drv: the driver structure to unregister
1244 * Deletes the driver structure from the list of registered PCI drivers,
1245 * gives it a chance to clean up by calling its remove() function for
1246 * each device it was responsible for, and marks those devices as
1251 pci_unregister_driver(struct pci_driver
*drv
)
1253 driver_unregister(&drv
->driver
);
1254 pci_free_dynids(drv
);
1257 static struct pci_driver pci_compat_driver
= {
1262 * pci_dev_driver - get the pci_driver of a device
1263 * @dev: the device to query
1265 * Returns the appropriate pci_driver structure or %NULL if there is no
1266 * registered driver for the device.
1269 pci_dev_driver(const struct pci_dev
*dev
)
1275 for(i
=0; i
<=PCI_ROM_RESOURCE
; i
++)
1276 if (dev
->resource
[i
].flags
& IORESOURCE_BUSY
)
1277 return &pci_compat_driver
;
1283 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1284 * @dev: the PCI device structure to match against
1285 * @drv: the device driver to search for matching PCI device id structures
1287 * Used by a driver to check whether a PCI device present in the
1288 * system is in its list of supported devices. Returns the matching
1289 * pci_device_id structure or %NULL if there is no match.
1291 static int pci_bus_match(struct device
*dev
, struct device_driver
*drv
)
1293 struct pci_dev
*pci_dev
= to_pci_dev(dev
);
1294 struct pci_driver
*pci_drv
;
1295 const struct pci_device_id
*found_id
;
1297 if (!pci_dev
->match_driver
)
1300 pci_drv
= to_pci_driver(drv
);
1301 found_id
= pci_match_device(pci_drv
, pci_dev
);
1309 * pci_dev_get - increments the reference count of the pci device structure
1310 * @dev: the device being referenced
1312 * Each live reference to a device should be refcounted.
1314 * Drivers for PCI devices should normally record such references in
1315 * their probe() methods, when they bind to a device, and release
1316 * them by calling pci_dev_put(), in their disconnect() methods.
1318 * A pointer to the device with the incremented reference counter is returned.
1320 struct pci_dev
*pci_dev_get(struct pci_dev
*dev
)
1323 get_device(&dev
->dev
);
1328 * pci_dev_put - release a use of the pci device structure
1329 * @dev: device that's been disconnected
1331 * Must be called when a user of a device is finished with it. When the last
1332 * user of the device calls this function, the memory of the device is freed.
1334 void pci_dev_put(struct pci_dev
*dev
)
1337 put_device(&dev
->dev
);
1340 static int pci_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
1342 struct pci_dev
*pdev
;
1347 pdev
= to_pci_dev(dev
);
1349 if (add_uevent_var(env
, "PCI_CLASS=%04X", pdev
->class))
1352 if (add_uevent_var(env
, "PCI_ID=%04X:%04X", pdev
->vendor
, pdev
->device
))
1355 if (add_uevent_var(env
, "PCI_SUBSYS_ID=%04X:%04X", pdev
->subsystem_vendor
,
1356 pdev
->subsystem_device
))
1359 if (add_uevent_var(env
, "PCI_SLOT_NAME=%s", pci_name(pdev
)))
1362 if (add_uevent_var(env
, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1363 pdev
->vendor
, pdev
->device
,
1364 pdev
->subsystem_vendor
, pdev
->subsystem_device
,
1365 (u8
)(pdev
->class >> 16), (u8
)(pdev
->class >> 8),
1372 struct bus_type pci_bus_type
= {
1374 .match
= pci_bus_match
,
1375 .uevent
= pci_uevent
,
1376 .probe
= pci_device_probe
,
1377 .remove
= pci_device_remove
,
1378 .shutdown
= pci_device_shutdown
,
1379 .dev_groups
= pci_dev_groups
,
1380 .bus_groups
= pci_bus_groups
,
1381 .drv_groups
= pci_drv_groups
,
1382 .pm
= PCI_PM_OPS_PTR
,
1385 static int __init
pci_driver_init(void)
1387 return bus_register(&pci_bus_type
);
1390 postcore_initcall(pci_driver_init
);
1392 EXPORT_SYMBOL_GPL(pci_add_dynid
);
1393 EXPORT_SYMBOL(pci_match_id
);
1394 EXPORT_SYMBOL(__pci_register_driver
);
1395 EXPORT_SYMBOL(pci_unregister_driver
);
1396 EXPORT_SYMBOL(pci_dev_driver
);
1397 EXPORT_SYMBOL(pci_bus_type
);
1398 EXPORT_SYMBOL(pci_dev_get
);
1399 EXPORT_SYMBOL(pci_dev_put
);