2 * PCI Bus Services, see include/linux/pci.h for further explanation.
4 * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
7 * Copyright 1997 -- 2000 Martin Mares <mj@ucw.cz>
10 #include <linux/kernel.h>
11 #include <linux/delay.h>
12 #include <linux/init.h>
13 #include <linux/pci.h>
15 #include <linux/slab.h>
16 #include <linux/module.h>
17 #include <linux/spinlock.h>
18 #include <linux/string.h>
19 #include <linux/log2.h>
20 #include <linux/pci-aspm.h>
21 #include <linux/pm_wakeup.h>
22 #include <linux/interrupt.h>
23 #include <linux/device.h>
24 #include <linux/pm_runtime.h>
25 #include <asm-generic/pci-bridge.h>
26 #include <asm/setup.h>
29 const char *pci_power_names
[] = {
30 "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
32 EXPORT_SYMBOL_GPL(pci_power_names
);
34 int isa_dma_bridge_buggy
;
35 EXPORT_SYMBOL(isa_dma_bridge_buggy
);
38 EXPORT_SYMBOL(pci_pci_problems
);
40 unsigned int pci_pm_d3_delay
;
42 static void pci_pme_list_scan(struct work_struct
*work
);
44 static LIST_HEAD(pci_pme_list
);
45 static DEFINE_MUTEX(pci_pme_list_mutex
);
46 static DECLARE_DELAYED_WORK(pci_pme_work
, pci_pme_list_scan
);
48 struct pci_pme_device
{
49 struct list_head list
;
53 #define PME_TIMEOUT 1000 /* How long between PME checks */
55 static void pci_dev_d3_sleep(struct pci_dev
*dev
)
57 unsigned int delay
= dev
->d3_delay
;
59 if (delay
< pci_pm_d3_delay
)
60 delay
= pci_pm_d3_delay
;
65 #ifdef CONFIG_PCI_DOMAINS
66 int pci_domains_supported
= 1;
69 #define DEFAULT_CARDBUS_IO_SIZE (256)
70 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
71 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
72 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
73 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
75 #define DEFAULT_HOTPLUG_IO_SIZE (256)
76 #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
77 /* pci=hpmemsize=nnM,hpiosize=nn can override this */
78 unsigned long pci_hotplug_io_size
= DEFAULT_HOTPLUG_IO_SIZE
;
79 unsigned long pci_hotplug_mem_size
= DEFAULT_HOTPLUG_MEM_SIZE
;
81 enum pcie_bus_config_types pcie_bus_config
= PCIE_BUS_TUNE_OFF
;
84 * The default CLS is used if arch didn't set CLS explicitly and not
85 * all pci devices agree on the same value. Arch can override either
86 * the dfl or actual value as it sees fit. Don't forget this is
87 * measured in 32-bit words, not bytes.
89 u8 pci_dfl_cache_line_size __devinitdata
= L1_CACHE_BYTES
>> 2;
90 u8 pci_cache_line_size
;
93 * If we set up a device for bus mastering, we need to check the latency
94 * timer as certain BIOSes forget to set it properly.
96 unsigned int pcibios_max_latency
= 255;
98 /* If set, the PCIe ARI capability will not be used. */
99 static bool pcie_ari_disabled
;
102 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
103 * @bus: pointer to PCI bus structure to search
105 * Given a PCI bus, returns the highest PCI bus number present in the set
106 * including the given PCI bus and its list of child PCI buses.
108 unsigned char pci_bus_max_busnr(struct pci_bus
* bus
)
110 struct list_head
*tmp
;
111 unsigned char max
, n
;
113 max
= bus
->subordinate
;
114 list_for_each(tmp
, &bus
->children
) {
115 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
121 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
123 #ifdef CONFIG_HAS_IOMEM
124 void __iomem
*pci_ioremap_bar(struct pci_dev
*pdev
, int bar
)
127 * Make sure the BAR is actually a memory resource, not an IO resource
129 if (!(pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)) {
133 return ioremap_nocache(pci_resource_start(pdev
, bar
),
134 pci_resource_len(pdev
, bar
));
136 EXPORT_SYMBOL_GPL(pci_ioremap_bar
);
141 * pci_max_busnr - returns maximum PCI bus number
143 * Returns the highest PCI bus number present in the system global list of
146 unsigned char __devinit
149 struct pci_bus
*bus
= NULL
;
150 unsigned char max
, n
;
153 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
154 n
= pci_bus_max_busnr(bus
);
163 #define PCI_FIND_CAP_TTL 48
165 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
166 u8 pos
, int cap
, int *ttl
)
171 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
175 pci_bus_read_config_byte(bus
, devfn
, pos
+ PCI_CAP_LIST_ID
,
181 pos
+= PCI_CAP_LIST_NEXT
;
186 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
189 int ttl
= PCI_FIND_CAP_TTL
;
191 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
194 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
196 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
197 pos
+ PCI_CAP_LIST_NEXT
, cap
);
199 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
201 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
202 unsigned int devfn
, u8 hdr_type
)
206 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
207 if (!(status
& PCI_STATUS_CAP_LIST
))
211 case PCI_HEADER_TYPE_NORMAL
:
212 case PCI_HEADER_TYPE_BRIDGE
:
213 return PCI_CAPABILITY_LIST
;
214 case PCI_HEADER_TYPE_CARDBUS
:
215 return PCI_CB_CAPABILITY_LIST
;
224 * pci_find_capability - query for devices' capabilities
225 * @dev: PCI device to query
226 * @cap: capability code
228 * Tell if a device supports a given PCI capability.
229 * Returns the address of the requested capability structure within the
230 * device's PCI configuration space or 0 in case the device does not
231 * support it. Possible values for @cap:
233 * %PCI_CAP_ID_PM Power Management
234 * %PCI_CAP_ID_AGP Accelerated Graphics Port
235 * %PCI_CAP_ID_VPD Vital Product Data
236 * %PCI_CAP_ID_SLOTID Slot Identification
237 * %PCI_CAP_ID_MSI Message Signalled Interrupts
238 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
239 * %PCI_CAP_ID_PCIX PCI-X
240 * %PCI_CAP_ID_EXP PCI Express
242 int pci_find_capability(struct pci_dev
*dev
, int cap
)
246 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
248 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
254 * pci_bus_find_capability - query for devices' capabilities
255 * @bus: the PCI bus to query
256 * @devfn: PCI device to query
257 * @cap: capability code
259 * Like pci_find_capability() but works for pci devices that do not have a
260 * pci_dev structure set up yet.
262 * Returns the address of the requested capability structure within the
263 * device's PCI configuration space or 0 in case the device does not
266 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
271 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
273 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
275 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
281 * pci_find_ext_capability - Find an extended capability
282 * @dev: PCI device to query
283 * @cap: capability code
285 * Returns the address of the requested extended capability structure
286 * within the device's PCI configuration space or 0 if the device does
287 * not support it. Possible values for @cap:
289 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
290 * %PCI_EXT_CAP_ID_VC Virtual Channel
291 * %PCI_EXT_CAP_ID_DSN Device Serial Number
292 * %PCI_EXT_CAP_ID_PWR Power Budgeting
294 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
298 int pos
= PCI_CFG_SPACE_SIZE
;
300 /* minimum 8 bytes per capability */
301 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
303 if (dev
->cfg_size
<= PCI_CFG_SPACE_SIZE
)
306 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
310 * If we have no capabilities, this is indicated by cap ID,
311 * cap version and next pointer all being 0.
317 if (PCI_EXT_CAP_ID(header
) == cap
)
320 pos
= PCI_EXT_CAP_NEXT(header
);
321 if (pos
< PCI_CFG_SPACE_SIZE
)
324 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
330 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
333 * pci_bus_find_ext_capability - find an extended capability
334 * @bus: the PCI bus to query
335 * @devfn: PCI device to query
336 * @cap: capability code
338 * Like pci_find_ext_capability() but works for pci devices that do not have a
339 * pci_dev structure set up yet.
341 * Returns the address of the requested capability structure within the
342 * device's PCI configuration space or 0 in case the device does not
345 int pci_bus_find_ext_capability(struct pci_bus
*bus
, unsigned int devfn
,
350 int pos
= PCI_CFG_SPACE_SIZE
;
352 /* minimum 8 bytes per capability */
353 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
355 if (!pci_bus_read_config_dword(bus
, devfn
, pos
, &header
))
357 if (header
== 0xffffffff || header
== 0)
361 if (PCI_EXT_CAP_ID(header
) == cap
)
364 pos
= PCI_EXT_CAP_NEXT(header
);
365 if (pos
< PCI_CFG_SPACE_SIZE
)
368 if (!pci_bus_read_config_dword(bus
, devfn
, pos
, &header
))
375 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
377 int rc
, ttl
= PCI_FIND_CAP_TTL
;
380 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
381 mask
= HT_3BIT_CAP_MASK
;
383 mask
= HT_5BIT_CAP_MASK
;
385 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
386 PCI_CAP_ID_HT
, &ttl
);
388 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
389 if (rc
!= PCIBIOS_SUCCESSFUL
)
392 if ((cap
& mask
) == ht_cap
)
395 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
396 pos
+ PCI_CAP_LIST_NEXT
,
397 PCI_CAP_ID_HT
, &ttl
);
403 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
404 * @dev: PCI device to query
405 * @pos: Position from which to continue searching
406 * @ht_cap: Hypertransport capability code
408 * To be used in conjunction with pci_find_ht_capability() to search for
409 * all capabilities matching @ht_cap. @pos should always be a value returned
410 * from pci_find_ht_capability().
412 * NB. To be 100% safe against broken PCI devices, the caller should take
413 * steps to avoid an infinite loop.
415 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
417 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
419 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
422 * pci_find_ht_capability - query a device's Hypertransport capabilities
423 * @dev: PCI device to query
424 * @ht_cap: Hypertransport capability code
426 * Tell if a device supports a given Hypertransport capability.
427 * Returns an address within the device's PCI configuration space
428 * or 0 in case the device does not support the request capability.
429 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
430 * which has a Hypertransport capability matching @ht_cap.
432 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
436 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
438 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
442 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
445 * pci_find_parent_resource - return resource region of parent bus of given region
446 * @dev: PCI device structure contains resources to be searched
447 * @res: child resource record for which parent is sought
449 * For given resource region of given device, return the resource
450 * region of parent bus the given region is contained in or where
451 * it should be allocated from.
454 pci_find_parent_resource(const struct pci_dev
*dev
, struct resource
*res
)
456 const struct pci_bus
*bus
= dev
->bus
;
458 struct resource
*best
= NULL
, *r
;
460 pci_bus_for_each_resource(bus
, r
, i
) {
463 if (res
->start
&& !(res
->start
>= r
->start
&& res
->end
<= r
->end
))
464 continue; /* Not contained */
465 if ((res
->flags
^ r
->flags
) & (IORESOURCE_IO
| IORESOURCE_MEM
))
466 continue; /* Wrong type */
467 if (!((res
->flags
^ r
->flags
) & IORESOURCE_PREFETCH
))
468 return r
; /* Exact match */
469 /* We can't insert a non-prefetch resource inside a prefetchable parent .. */
470 if (r
->flags
& IORESOURCE_PREFETCH
)
472 /* .. but we can put a prefetchable resource inside a non-prefetchable one */
480 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
481 * @dev: PCI device to have its BARs restored
483 * Restore the BAR values for a given device, so as to make it
484 * accessible by its driver.
487 pci_restore_bars(struct pci_dev
*dev
)
491 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++)
492 pci_update_resource(dev
, i
);
495 static struct pci_platform_pm_ops
*pci_platform_pm
;
497 int pci_set_platform_pm(struct pci_platform_pm_ops
*ops
)
499 if (!ops
->is_manageable
|| !ops
->set_state
|| !ops
->choose_state
500 || !ops
->sleep_wake
|| !ops
->can_wakeup
)
502 pci_platform_pm
= ops
;
506 static inline bool platform_pci_power_manageable(struct pci_dev
*dev
)
508 return pci_platform_pm
? pci_platform_pm
->is_manageable(dev
) : false;
511 static inline int platform_pci_set_power_state(struct pci_dev
*dev
,
514 return pci_platform_pm
? pci_platform_pm
->set_state(dev
, t
) : -ENOSYS
;
517 static inline pci_power_t
platform_pci_choose_state(struct pci_dev
*dev
)
519 return pci_platform_pm
?
520 pci_platform_pm
->choose_state(dev
) : PCI_POWER_ERROR
;
523 static inline bool platform_pci_can_wakeup(struct pci_dev
*dev
)
525 return pci_platform_pm
? pci_platform_pm
->can_wakeup(dev
) : false;
528 static inline int platform_pci_sleep_wake(struct pci_dev
*dev
, bool enable
)
530 return pci_platform_pm
?
531 pci_platform_pm
->sleep_wake(dev
, enable
) : -ENODEV
;
534 static inline int platform_pci_run_wake(struct pci_dev
*dev
, bool enable
)
536 return pci_platform_pm
?
537 pci_platform_pm
->run_wake(dev
, enable
) : -ENODEV
;
541 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
543 * @dev: PCI device to handle.
544 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
547 * -EINVAL if the requested state is invalid.
548 * -EIO if device does not support PCI PM or its PM capabilities register has a
549 * wrong version, or device doesn't support the requested state.
550 * 0 if device already is in the requested state.
551 * 0 if device's power state has been successfully changed.
553 static int pci_raw_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
556 bool need_restore
= false;
558 /* Check if we're already there */
559 if (dev
->current_state
== state
)
565 if (state
< PCI_D0
|| state
> PCI_D3hot
)
568 /* Validate current state:
569 * Can enter D0 from any state, but if we can only go deeper
570 * to sleep if we're already in a low power state
572 if (state
!= PCI_D0
&& dev
->current_state
<= PCI_D3cold
573 && dev
->current_state
> state
) {
574 dev_err(&dev
->dev
, "invalid power transition "
575 "(from state %d to %d)\n", dev
->current_state
, state
);
579 /* check if this device supports the desired state */
580 if ((state
== PCI_D1
&& !dev
->d1_support
)
581 || (state
== PCI_D2
&& !dev
->d2_support
))
584 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
586 /* If we're (effectively) in D3, force entire word to 0.
587 * This doesn't affect PME_Status, disables PME_En, and
588 * sets PowerState to 0.
590 switch (dev
->current_state
) {
594 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
599 case PCI_UNKNOWN
: /* Boot-up */
600 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
601 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
603 /* Fall-through: force to D0 */
609 /* enter specified state */
610 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
612 /* Mandatory power management transition delays */
613 /* see PCI PM 1.1 5.6.1 table 18 */
614 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
615 pci_dev_d3_sleep(dev
);
616 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
617 udelay(PCI_PM_D2_DELAY
);
619 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
620 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
621 if (dev
->current_state
!= state
&& printk_ratelimit())
622 dev_info(&dev
->dev
, "Refused to change power state, "
623 "currently in D%d\n", dev
->current_state
);
625 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
626 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
627 * from D3hot to D0 _may_ perform an internal reset, thereby
628 * going to "D0 Uninitialized" rather than "D0 Initialized".
629 * For example, at least some versions of the 3c905B and the
630 * 3c556B exhibit this behaviour.
632 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
633 * devices in a D3hot state at boot. Consequently, we need to
634 * restore at least the BARs so that the device will be
635 * accessible to its driver.
638 pci_restore_bars(dev
);
641 pcie_aspm_pm_state_change(dev
->bus
->self
);
647 * pci_update_current_state - Read PCI power state of given device from its
648 * PCI PM registers and cache it
649 * @dev: PCI device to handle.
650 * @state: State to cache in case the device doesn't have the PM capability
652 void pci_update_current_state(struct pci_dev
*dev
, pci_power_t state
)
657 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
658 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
660 dev
->current_state
= state
;
665 * pci_platform_power_transition - Use platform to change device power state
666 * @dev: PCI device to handle.
667 * @state: State to put the device into.
669 static int pci_platform_power_transition(struct pci_dev
*dev
, pci_power_t state
)
673 if (platform_pci_power_manageable(dev
)) {
674 error
= platform_pci_set_power_state(dev
, state
);
676 pci_update_current_state(dev
, state
);
677 /* Fall back to PCI_D0 if native PM is not supported */
679 dev
->current_state
= PCI_D0
;
682 /* Fall back to PCI_D0 if native PM is not supported */
684 dev
->current_state
= PCI_D0
;
691 * __pci_start_power_transition - Start power transition of a PCI device
692 * @dev: PCI device to handle.
693 * @state: State to put the device into.
695 static void __pci_start_power_transition(struct pci_dev
*dev
, pci_power_t state
)
698 pci_platform_power_transition(dev
, PCI_D0
);
702 * __pci_complete_power_transition - Complete power transition of a PCI device
703 * @dev: PCI device to handle.
704 * @state: State to put the device into.
706 * This function should not be called directly by device drivers.
708 int __pci_complete_power_transition(struct pci_dev
*dev
, pci_power_t state
)
710 return state
>= PCI_D0
?
711 pci_platform_power_transition(dev
, state
) : -EINVAL
;
713 EXPORT_SYMBOL_GPL(__pci_complete_power_transition
);
716 * pci_set_power_state - Set the power state of a PCI device
717 * @dev: PCI device to handle.
718 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
720 * Transition a device to a new power state, using the platform firmware and/or
721 * the device's PCI PM registers.
724 * -EINVAL if the requested state is invalid.
725 * -EIO if device does not support PCI PM or its PM capabilities register has a
726 * wrong version, or device doesn't support the requested state.
727 * 0 if device already is in the requested state.
728 * 0 if device's power state has been successfully changed.
730 int pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
734 /* bound the state we're entering */
735 if (state
> PCI_D3hot
)
737 else if (state
< PCI_D0
)
739 else if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
741 * If the device or the parent bridge do not support PCI PM,
742 * ignore the request if we're doing anything other than putting
743 * it into D0 (which would only happen on boot).
747 __pci_start_power_transition(dev
, state
);
749 /* This device is quirked not to be put into D3, so
750 don't put it in D3 */
751 if (state
== PCI_D3hot
&& (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3
))
754 error
= pci_raw_set_power_state(dev
, state
);
756 if (!__pci_complete_power_transition(dev
, state
))
759 * When aspm_policy is "powersave" this call ensures
760 * that ASPM is configured.
762 if (!error
&& dev
->bus
->self
)
763 pcie_aspm_powersave_config_link(dev
->bus
->self
);
769 * pci_choose_state - Choose the power state of a PCI device
770 * @dev: PCI device to be suspended
771 * @state: target sleep state for the whole system. This is the value
772 * that is passed to suspend() function.
774 * Returns PCI power state suitable for given device and given system
778 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
782 if (!pci_find_capability(dev
, PCI_CAP_ID_PM
))
785 ret
= platform_pci_choose_state(dev
);
786 if (ret
!= PCI_POWER_ERROR
)
789 switch (state
.event
) {
792 case PM_EVENT_FREEZE
:
793 case PM_EVENT_PRETHAW
:
794 /* REVISIT both freeze and pre-thaw "should" use D0 */
795 case PM_EVENT_SUSPEND
:
796 case PM_EVENT_HIBERNATE
:
799 dev_info(&dev
->dev
, "unrecognized suspend event %d\n",
806 EXPORT_SYMBOL(pci_choose_state
);
808 #define PCI_EXP_SAVE_REGS 7
810 #define pcie_cap_has_devctl(type, flags) 1
811 #define pcie_cap_has_lnkctl(type, flags) \
812 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
813 (type == PCI_EXP_TYPE_ROOT_PORT || \
814 type == PCI_EXP_TYPE_ENDPOINT || \
815 type == PCI_EXP_TYPE_LEG_END))
816 #define pcie_cap_has_sltctl(type, flags) \
817 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
818 ((type == PCI_EXP_TYPE_ROOT_PORT) || \
819 (type == PCI_EXP_TYPE_DOWNSTREAM && \
820 (flags & PCI_EXP_FLAGS_SLOT))))
821 #define pcie_cap_has_rtctl(type, flags) \
822 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
823 (type == PCI_EXP_TYPE_ROOT_PORT || \
824 type == PCI_EXP_TYPE_RC_EC))
825 #define pcie_cap_has_devctl2(type, flags) \
826 ((flags & PCI_EXP_FLAGS_VERS) > 1)
827 #define pcie_cap_has_lnkctl2(type, flags) \
828 ((flags & PCI_EXP_FLAGS_VERS) > 1)
829 #define pcie_cap_has_sltctl2(type, flags) \
830 ((flags & PCI_EXP_FLAGS_VERS) > 1)
832 static struct pci_cap_saved_state
*pci_find_saved_cap(
833 struct pci_dev
*pci_dev
, char cap
)
835 struct pci_cap_saved_state
*tmp
;
836 struct hlist_node
*pos
;
838 hlist_for_each_entry(tmp
, pos
, &pci_dev
->saved_cap_space
, next
) {
839 if (tmp
->cap
.cap_nr
== cap
)
845 static int pci_save_pcie_state(struct pci_dev
*dev
)
848 struct pci_cap_saved_state
*save_state
;
852 pos
= pci_pcie_cap(dev
);
856 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
858 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
861 cap
= (u16
*)&save_state
->cap
.data
[0];
863 pci_read_config_word(dev
, pos
+ PCI_EXP_FLAGS
, &flags
);
865 if (pcie_cap_has_devctl(dev
->pcie_type
, flags
))
866 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &cap
[i
++]);
867 if (pcie_cap_has_lnkctl(dev
->pcie_type
, flags
))
868 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, &cap
[i
++]);
869 if (pcie_cap_has_sltctl(dev
->pcie_type
, flags
))
870 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, &cap
[i
++]);
871 if (pcie_cap_has_rtctl(dev
->pcie_type
, flags
))
872 pci_read_config_word(dev
, pos
+ PCI_EXP_RTCTL
, &cap
[i
++]);
873 if (pcie_cap_has_devctl2(dev
->pcie_type
, flags
))
874 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &cap
[i
++]);
875 if (pcie_cap_has_lnkctl2(dev
->pcie_type
, flags
))
876 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL2
, &cap
[i
++]);
877 if (pcie_cap_has_sltctl2(dev
->pcie_type
, flags
))
878 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL2
, &cap
[i
++]);
883 static void pci_restore_pcie_state(struct pci_dev
*dev
)
886 struct pci_cap_saved_state
*save_state
;
890 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
891 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
892 if (!save_state
|| pos
<= 0)
894 cap
= (u16
*)&save_state
->cap
.data
[0];
896 pci_read_config_word(dev
, pos
+ PCI_EXP_FLAGS
, &flags
);
898 if (pcie_cap_has_devctl(dev
->pcie_type
, flags
))
899 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, cap
[i
++]);
900 if (pcie_cap_has_lnkctl(dev
->pcie_type
, flags
))
901 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, cap
[i
++]);
902 if (pcie_cap_has_sltctl(dev
->pcie_type
, flags
))
903 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, cap
[i
++]);
904 if (pcie_cap_has_rtctl(dev
->pcie_type
, flags
))
905 pci_write_config_word(dev
, pos
+ PCI_EXP_RTCTL
, cap
[i
++]);
906 if (pcie_cap_has_devctl2(dev
->pcie_type
, flags
))
907 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, cap
[i
++]);
908 if (pcie_cap_has_lnkctl2(dev
->pcie_type
, flags
))
909 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL2
, cap
[i
++]);
910 if (pcie_cap_has_sltctl2(dev
->pcie_type
, flags
))
911 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL2
, cap
[i
++]);
915 static int pci_save_pcix_state(struct pci_dev
*dev
)
918 struct pci_cap_saved_state
*save_state
;
920 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
924 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
926 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
930 pci_read_config_word(dev
, pos
+ PCI_X_CMD
,
931 (u16
*)save_state
->cap
.data
);
936 static void pci_restore_pcix_state(struct pci_dev
*dev
)
939 struct pci_cap_saved_state
*save_state
;
942 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
943 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
944 if (!save_state
|| pos
<= 0)
946 cap
= (u16
*)&save_state
->cap
.data
[0];
948 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
953 * pci_save_state - save the PCI configuration space of a device before suspending
954 * @dev: - PCI device that we're dealing with
957 pci_save_state(struct pci_dev
*dev
)
960 /* XXX: 100% dword access ok here? */
961 for (i
= 0; i
< 16; i
++)
962 pci_read_config_dword(dev
, i
* 4, &dev
->saved_config_space
[i
]);
963 dev
->state_saved
= true;
964 if ((i
= pci_save_pcie_state(dev
)) != 0)
966 if ((i
= pci_save_pcix_state(dev
)) != 0)
971 static void pci_restore_config_dword(struct pci_dev
*pdev
, int offset
,
972 u32 saved_val
, int retry
)
976 pci_read_config_dword(pdev
, offset
, &val
);
977 if (val
== saved_val
)
981 dev_dbg(&pdev
->dev
, "restoring config space at offset "
982 "%#x (was %#x, writing %#x)\n", offset
, val
, saved_val
);
983 pci_write_config_dword(pdev
, offset
, saved_val
);
987 pci_read_config_dword(pdev
, offset
, &val
);
988 if (val
== saved_val
)
995 static void pci_restore_config_space_range(struct pci_dev
*pdev
,
996 int start
, int end
, int retry
)
1000 for (index
= end
; index
>= start
; index
--)
1001 pci_restore_config_dword(pdev
, 4 * index
,
1002 pdev
->saved_config_space
[index
],
1006 static void pci_restore_config_space(struct pci_dev
*pdev
)
1008 if (pdev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
) {
1009 pci_restore_config_space_range(pdev
, 10, 15, 0);
1010 /* Restore BARs before the command register. */
1011 pci_restore_config_space_range(pdev
, 4, 9, 10);
1012 pci_restore_config_space_range(pdev
, 0, 3, 0);
1014 pci_restore_config_space_range(pdev
, 0, 15, 0);
1019 * pci_restore_state - Restore the saved state of a PCI device
1020 * @dev: - PCI device that we're dealing with
1022 void pci_restore_state(struct pci_dev
*dev
)
1024 if (!dev
->state_saved
)
1027 /* PCI Express register must be restored first */
1028 pci_restore_pcie_state(dev
);
1029 pci_restore_ats_state(dev
);
1031 pci_restore_config_space(dev
);
1033 pci_restore_pcix_state(dev
);
1034 pci_restore_msi_state(dev
);
1035 pci_restore_iov_state(dev
);
1037 dev
->state_saved
= false;
1040 struct pci_saved_state
{
1041 u32 config_space
[16];
1042 struct pci_cap_saved_data cap
[0];
1046 * pci_store_saved_state - Allocate and return an opaque struct containing
1047 * the device saved state.
1048 * @dev: PCI device that we're dealing with
1050 * Rerturn NULL if no state or error.
1052 struct pci_saved_state
*pci_store_saved_state(struct pci_dev
*dev
)
1054 struct pci_saved_state
*state
;
1055 struct pci_cap_saved_state
*tmp
;
1056 struct pci_cap_saved_data
*cap
;
1057 struct hlist_node
*pos
;
1060 if (!dev
->state_saved
)
1063 size
= sizeof(*state
) + sizeof(struct pci_cap_saved_data
);
1065 hlist_for_each_entry(tmp
, pos
, &dev
->saved_cap_space
, next
)
1066 size
+= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1068 state
= kzalloc(size
, GFP_KERNEL
);
1072 memcpy(state
->config_space
, dev
->saved_config_space
,
1073 sizeof(state
->config_space
));
1076 hlist_for_each_entry(tmp
, pos
, &dev
->saved_cap_space
, next
) {
1077 size_t len
= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1078 memcpy(cap
, &tmp
->cap
, len
);
1079 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+ len
);
1081 /* Empty cap_save terminates list */
1085 EXPORT_SYMBOL_GPL(pci_store_saved_state
);
1088 * pci_load_saved_state - Reload the provided save state into struct pci_dev.
1089 * @dev: PCI device that we're dealing with
1090 * @state: Saved state returned from pci_store_saved_state()
1092 int pci_load_saved_state(struct pci_dev
*dev
, struct pci_saved_state
*state
)
1094 struct pci_cap_saved_data
*cap
;
1096 dev
->state_saved
= false;
1101 memcpy(dev
->saved_config_space
, state
->config_space
,
1102 sizeof(state
->config_space
));
1106 struct pci_cap_saved_state
*tmp
;
1108 tmp
= pci_find_saved_cap(dev
, cap
->cap_nr
);
1109 if (!tmp
|| tmp
->cap
.size
!= cap
->size
)
1112 memcpy(tmp
->cap
.data
, cap
->data
, tmp
->cap
.size
);
1113 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+
1114 sizeof(struct pci_cap_saved_data
) + cap
->size
);
1117 dev
->state_saved
= true;
1120 EXPORT_SYMBOL_GPL(pci_load_saved_state
);
1123 * pci_load_and_free_saved_state - Reload the save state pointed to by state,
1124 * and free the memory allocated for it.
1125 * @dev: PCI device that we're dealing with
1126 * @state: Pointer to saved state returned from pci_store_saved_state()
1128 int pci_load_and_free_saved_state(struct pci_dev
*dev
,
1129 struct pci_saved_state
**state
)
1131 int ret
= pci_load_saved_state(dev
, *state
);
1136 EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state
);
1138 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
1142 err
= pci_set_power_state(dev
, PCI_D0
);
1143 if (err
< 0 && err
!= -EIO
)
1145 err
= pcibios_enable_device(dev
, bars
);
1148 pci_fixup_device(pci_fixup_enable
, dev
);
1154 * pci_reenable_device - Resume abandoned device
1155 * @dev: PCI device to be resumed
1157 * Note this function is a backend of pci_default_resume and is not supposed
1158 * to be called by normal code, write proper resume handler and use it instead.
1160 int pci_reenable_device(struct pci_dev
*dev
)
1162 if (pci_is_enabled(dev
))
1163 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
1167 static int __pci_enable_device_flags(struct pci_dev
*dev
,
1168 resource_size_t flags
)
1174 * Power state could be unknown at this point, either due to a fresh
1175 * boot or a device removal call. So get the current power state
1176 * so that things like MSI message writing will behave as expected
1177 * (e.g. if the device really is in D0 at enable time).
1181 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1182 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
1185 if (atomic_add_return(1, &dev
->enable_cnt
) > 1)
1186 return 0; /* already enabled */
1188 /* only skip sriov related */
1189 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1190 if (dev
->resource
[i
].flags
& flags
)
1192 for (i
= PCI_BRIDGE_RESOURCES
; i
< DEVICE_COUNT_RESOURCE
; i
++)
1193 if (dev
->resource
[i
].flags
& flags
)
1196 err
= do_pci_enable_device(dev
, bars
);
1198 atomic_dec(&dev
->enable_cnt
);
1203 * pci_enable_device_io - Initialize a device for use with IO space
1204 * @dev: PCI device to be initialized
1206 * Initialize device before it's used by a driver. Ask low-level code
1207 * to enable I/O resources. Wake up the device if it was suspended.
1208 * Beware, this function can fail.
1210 int pci_enable_device_io(struct pci_dev
*dev
)
1212 return __pci_enable_device_flags(dev
, IORESOURCE_IO
);
1216 * pci_enable_device_mem - Initialize a device for use with Memory space
1217 * @dev: PCI device to be initialized
1219 * Initialize device before it's used by a driver. Ask low-level code
1220 * to enable Memory resources. Wake up the device if it was suspended.
1221 * Beware, this function can fail.
1223 int pci_enable_device_mem(struct pci_dev
*dev
)
1225 return __pci_enable_device_flags(dev
, IORESOURCE_MEM
);
1229 * pci_enable_device - Initialize device before it's used by a driver.
1230 * @dev: PCI device to be initialized
1232 * Initialize device before it's used by a driver. Ask low-level code
1233 * to enable I/O and memory. Wake up the device if it was suspended.
1234 * Beware, this function can fail.
1236 * Note we don't actually enable the device many times if we call
1237 * this function repeatedly (we just increment the count).
1239 int pci_enable_device(struct pci_dev
*dev
)
1241 return __pci_enable_device_flags(dev
, IORESOURCE_MEM
| IORESOURCE_IO
);
1245 * Managed PCI resources. This manages device on/off, intx/msi/msix
1246 * on/off and BAR regions. pci_dev itself records msi/msix status, so
1247 * there's no need to track it separately. pci_devres is initialized
1248 * when a device is enabled using managed PCI device enable interface.
1251 unsigned int enabled
:1;
1252 unsigned int pinned
:1;
1253 unsigned int orig_intx
:1;
1254 unsigned int restore_intx
:1;
1258 static void pcim_release(struct device
*gendev
, void *res
)
1260 struct pci_dev
*dev
= container_of(gendev
, struct pci_dev
, dev
);
1261 struct pci_devres
*this = res
;
1264 if (dev
->msi_enabled
)
1265 pci_disable_msi(dev
);
1266 if (dev
->msix_enabled
)
1267 pci_disable_msix(dev
);
1269 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
1270 if (this->region_mask
& (1 << i
))
1271 pci_release_region(dev
, i
);
1273 if (this->restore_intx
)
1274 pci_intx(dev
, this->orig_intx
);
1276 if (this->enabled
&& !this->pinned
)
1277 pci_disable_device(dev
);
1280 static struct pci_devres
* get_pci_dr(struct pci_dev
*pdev
)
1282 struct pci_devres
*dr
, *new_dr
;
1284 dr
= devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1288 new_dr
= devres_alloc(pcim_release
, sizeof(*new_dr
), GFP_KERNEL
);
1291 return devres_get(&pdev
->dev
, new_dr
, NULL
, NULL
);
1294 static struct pci_devres
* find_pci_dr(struct pci_dev
*pdev
)
1296 if (pci_is_managed(pdev
))
1297 return devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1302 * pcim_enable_device - Managed pci_enable_device()
1303 * @pdev: PCI device to be initialized
1305 * Managed pci_enable_device().
1307 int pcim_enable_device(struct pci_dev
*pdev
)
1309 struct pci_devres
*dr
;
1312 dr
= get_pci_dr(pdev
);
1318 rc
= pci_enable_device(pdev
);
1320 pdev
->is_managed
= 1;
1327 * pcim_pin_device - Pin managed PCI device
1328 * @pdev: PCI device to pin
1330 * Pin managed PCI device @pdev. Pinned device won't be disabled on
1331 * driver detach. @pdev must have been enabled with
1332 * pcim_enable_device().
1334 void pcim_pin_device(struct pci_dev
*pdev
)
1336 struct pci_devres
*dr
;
1338 dr
= find_pci_dr(pdev
);
1339 WARN_ON(!dr
|| !dr
->enabled
);
1345 * pcibios_disable_device - disable arch specific PCI resources for device dev
1346 * @dev: the PCI device to disable
1348 * Disables architecture specific PCI resources for the device. This
1349 * is the default implementation. Architecture implementations can
1352 void __attribute__ ((weak
)) pcibios_disable_device (struct pci_dev
*dev
) {}
1354 static void do_pci_disable_device(struct pci_dev
*dev
)
1358 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
1359 if (pci_command
& PCI_COMMAND_MASTER
) {
1360 pci_command
&= ~PCI_COMMAND_MASTER
;
1361 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
1364 pcibios_disable_device(dev
);
1368 * pci_disable_enabled_device - Disable device without updating enable_cnt
1369 * @dev: PCI device to disable
1371 * NOTE: This function is a backend of PCI power management routines and is
1372 * not supposed to be called drivers.
1374 void pci_disable_enabled_device(struct pci_dev
*dev
)
1376 if (pci_is_enabled(dev
))
1377 do_pci_disable_device(dev
);
1381 * pci_disable_device - Disable PCI device after use
1382 * @dev: PCI device to be disabled
1384 * Signal to the system that the PCI device is not in use by the system
1385 * anymore. This only involves disabling PCI bus-mastering, if active.
1387 * Note we don't actually disable the device until all callers of
1388 * pci_enable_device() have called pci_disable_device().
1391 pci_disable_device(struct pci_dev
*dev
)
1393 struct pci_devres
*dr
;
1395 dr
= find_pci_dr(dev
);
1399 if (atomic_sub_return(1, &dev
->enable_cnt
) != 0)
1402 do_pci_disable_device(dev
);
1404 dev
->is_busmaster
= 0;
1408 * pcibios_set_pcie_reset_state - set reset state for device dev
1409 * @dev: the PCIe device reset
1410 * @state: Reset state to enter into
1413 * Sets the PCIe reset state for the device. This is the default
1414 * implementation. Architecture implementations can override this.
1416 int __attribute__ ((weak
)) pcibios_set_pcie_reset_state(struct pci_dev
*dev
,
1417 enum pcie_reset_state state
)
1423 * pci_set_pcie_reset_state - set reset state for device dev
1424 * @dev: the PCIe device reset
1425 * @state: Reset state to enter into
1428 * Sets the PCI reset state for the device.
1430 int pci_set_pcie_reset_state(struct pci_dev
*dev
, enum pcie_reset_state state
)
1432 return pcibios_set_pcie_reset_state(dev
, state
);
1436 * pci_check_pme_status - Check if given device has generated PME.
1437 * @dev: Device to check.
1439 * Check the PME status of the device and if set, clear it and clear PME enable
1440 * (if set). Return 'true' if PME status and PME enable were both set or
1441 * 'false' otherwise.
1443 bool pci_check_pme_status(struct pci_dev
*dev
)
1452 pmcsr_pos
= dev
->pm_cap
+ PCI_PM_CTRL
;
1453 pci_read_config_word(dev
, pmcsr_pos
, &pmcsr
);
1454 if (!(pmcsr
& PCI_PM_CTRL_PME_STATUS
))
1457 /* Clear PME status. */
1458 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1459 if (pmcsr
& PCI_PM_CTRL_PME_ENABLE
) {
1460 /* Disable PME to avoid interrupt flood. */
1461 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1465 pci_write_config_word(dev
, pmcsr_pos
, pmcsr
);
1471 * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
1472 * @dev: Device to handle.
1473 * @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
1475 * Check if @dev has generated PME and queue a resume request for it in that
1478 static int pci_pme_wakeup(struct pci_dev
*dev
, void *pme_poll_reset
)
1480 if (pme_poll_reset
&& dev
->pme_poll
)
1481 dev
->pme_poll
= false;
1483 if (pci_check_pme_status(dev
)) {
1484 pci_wakeup_event(dev
);
1485 pm_request_resume(&dev
->dev
);
1491 * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
1492 * @bus: Top bus of the subtree to walk.
1494 void pci_pme_wakeup_bus(struct pci_bus
*bus
)
1497 pci_walk_bus(bus
, pci_pme_wakeup
, (void *)true);
1501 * pci_pme_capable - check the capability of PCI device to generate PME#
1502 * @dev: PCI device to handle.
1503 * @state: PCI state from which device will issue PME#.
1505 bool pci_pme_capable(struct pci_dev
*dev
, pci_power_t state
)
1510 return !!(dev
->pme_support
& (1 << state
));
1513 static void pci_pme_list_scan(struct work_struct
*work
)
1515 struct pci_pme_device
*pme_dev
, *n
;
1517 mutex_lock(&pci_pme_list_mutex
);
1518 if (!list_empty(&pci_pme_list
)) {
1519 list_for_each_entry_safe(pme_dev
, n
, &pci_pme_list
, list
) {
1520 if (pme_dev
->dev
->pme_poll
) {
1521 pci_pme_wakeup(pme_dev
->dev
, NULL
);
1523 list_del(&pme_dev
->list
);
1527 if (!list_empty(&pci_pme_list
))
1528 schedule_delayed_work(&pci_pme_work
,
1529 msecs_to_jiffies(PME_TIMEOUT
));
1531 mutex_unlock(&pci_pme_list_mutex
);
1535 * pci_pme_active - enable or disable PCI device's PME# function
1536 * @dev: PCI device to handle.
1537 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1539 * The caller must verify that the device is capable of generating PME# before
1540 * calling this function with @enable equal to 'true'.
1542 void pci_pme_active(struct pci_dev
*dev
, bool enable
)
1549 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1550 /* Clear PME_Status by writing 1 to it and enable PME# */
1551 pmcsr
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
1553 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1555 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1557 /* PCI (as opposed to PCIe) PME requires that the device have
1558 its PME# line hooked up correctly. Not all hardware vendors
1559 do this, so the PME never gets delivered and the device
1560 remains asleep. The easiest way around this is to
1561 periodically walk the list of suspended devices and check
1562 whether any have their PME flag set. The assumption is that
1563 we'll wake up often enough anyway that this won't be a huge
1564 hit, and the power savings from the devices will still be a
1567 if (dev
->pme_poll
) {
1568 struct pci_pme_device
*pme_dev
;
1570 pme_dev
= kmalloc(sizeof(struct pci_pme_device
),
1575 mutex_lock(&pci_pme_list_mutex
);
1576 list_add(&pme_dev
->list
, &pci_pme_list
);
1577 if (list_is_singular(&pci_pme_list
))
1578 schedule_delayed_work(&pci_pme_work
,
1579 msecs_to_jiffies(PME_TIMEOUT
));
1580 mutex_unlock(&pci_pme_list_mutex
);
1582 mutex_lock(&pci_pme_list_mutex
);
1583 list_for_each_entry(pme_dev
, &pci_pme_list
, list
) {
1584 if (pme_dev
->dev
== dev
) {
1585 list_del(&pme_dev
->list
);
1590 mutex_unlock(&pci_pme_list_mutex
);
1595 dev_dbg(&dev
->dev
, "PME# %s\n", enable
? "enabled" : "disabled");
1599 * __pci_enable_wake - enable PCI device as wakeup event source
1600 * @dev: PCI device affected
1601 * @state: PCI state from which device will issue wakeup events
1602 * @runtime: True if the events are to be generated at run time
1603 * @enable: True to enable event generation; false to disable
1605 * This enables the device as a wakeup event source, or disables it.
1606 * When such events involves platform-specific hooks, those hooks are
1607 * called automatically by this routine.
1609 * Devices with legacy power management (no standard PCI PM capabilities)
1610 * always require such platform hooks.
1613 * 0 is returned on success
1614 * -EINVAL is returned if device is not supposed to wake up the system
1615 * Error code depending on the platform is returned if both the platform and
1616 * the native mechanism fail to enable the generation of wake-up events
1618 int __pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
,
1619 bool runtime
, bool enable
)
1623 if (enable
&& !runtime
&& !device_may_wakeup(&dev
->dev
))
1626 /* Don't do the same thing twice in a row for one device. */
1627 if (!!enable
== !!dev
->wakeup_prepared
)
1631 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1632 * Anderson we should be doing PME# wake enable followed by ACPI wake
1633 * enable. To disable wake-up we call the platform first, for symmetry.
1639 if (pci_pme_capable(dev
, state
))
1640 pci_pme_active(dev
, true);
1643 error
= runtime
? platform_pci_run_wake(dev
, true) :
1644 platform_pci_sleep_wake(dev
, true);
1648 dev
->wakeup_prepared
= true;
1651 platform_pci_run_wake(dev
, false);
1653 platform_pci_sleep_wake(dev
, false);
1654 pci_pme_active(dev
, false);
1655 dev
->wakeup_prepared
= false;
1660 EXPORT_SYMBOL(__pci_enable_wake
);
1663 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1664 * @dev: PCI device to prepare
1665 * @enable: True to enable wake-up event generation; false to disable
1667 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1668 * and this function allows them to set that up cleanly - pci_enable_wake()
1669 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1670 * ordering constraints.
1672 * This function only returns error code if the device is not capable of
1673 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1674 * enable wake-up power for it.
1676 int pci_wake_from_d3(struct pci_dev
*dev
, bool enable
)
1678 return pci_pme_capable(dev
, PCI_D3cold
) ?
1679 pci_enable_wake(dev
, PCI_D3cold
, enable
) :
1680 pci_enable_wake(dev
, PCI_D3hot
, enable
);
1684 * pci_target_state - find an appropriate low power state for a given PCI dev
1687 * Use underlying platform code to find a supported low power state for @dev.
1688 * If the platform can't manage @dev, return the deepest state from which it
1689 * can generate wake events, based on any available PME info.
1691 pci_power_t
pci_target_state(struct pci_dev
*dev
)
1693 pci_power_t target_state
= PCI_D3hot
;
1695 if (platform_pci_power_manageable(dev
)) {
1697 * Call the platform to choose the target state of the device
1698 * and enable wake-up from this state if supported.
1700 pci_power_t state
= platform_pci_choose_state(dev
);
1703 case PCI_POWER_ERROR
:
1708 if (pci_no_d1d2(dev
))
1711 target_state
= state
;
1713 } else if (!dev
->pm_cap
) {
1714 target_state
= PCI_D0
;
1715 } else if (device_may_wakeup(&dev
->dev
)) {
1717 * Find the deepest state from which the device can generate
1718 * wake-up events, make it the target state and enable device
1721 if (dev
->pme_support
) {
1723 && !(dev
->pme_support
& (1 << target_state
)))
1728 return target_state
;
1732 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
1733 * @dev: Device to handle.
1735 * Choose the power state appropriate for the device depending on whether
1736 * it can wake up the system and/or is power manageable by the platform
1737 * (PCI_D3hot is the default) and put the device into that state.
1739 int pci_prepare_to_sleep(struct pci_dev
*dev
)
1741 pci_power_t target_state
= pci_target_state(dev
);
1744 if (target_state
== PCI_POWER_ERROR
)
1747 /* Some devices mustn't be in D3 during system sleep */
1748 if (target_state
== PCI_D3hot
&&
1749 (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3_DURING_SLEEP
))
1752 pci_enable_wake(dev
, target_state
, device_may_wakeup(&dev
->dev
));
1754 error
= pci_set_power_state(dev
, target_state
);
1757 pci_enable_wake(dev
, target_state
, false);
1763 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
1764 * @dev: Device to handle.
1766 * Disable device's system wake-up capability and put it into D0.
1768 int pci_back_from_sleep(struct pci_dev
*dev
)
1770 pci_enable_wake(dev
, PCI_D0
, false);
1771 return pci_set_power_state(dev
, PCI_D0
);
1775 * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
1776 * @dev: PCI device being suspended.
1778 * Prepare @dev to generate wake-up events at run time and put it into a low
1781 int pci_finish_runtime_suspend(struct pci_dev
*dev
)
1783 pci_power_t target_state
= pci_target_state(dev
);
1786 if (target_state
== PCI_POWER_ERROR
)
1789 __pci_enable_wake(dev
, target_state
, true, pci_dev_run_wake(dev
));
1791 error
= pci_set_power_state(dev
, target_state
);
1794 __pci_enable_wake(dev
, target_state
, true, false);
1800 * pci_dev_run_wake - Check if device can generate run-time wake-up events.
1801 * @dev: Device to check.
1803 * Return true if the device itself is cabable of generating wake-up events
1804 * (through the platform or using the native PCIe PME) or if the device supports
1805 * PME and one of its upstream bridges can generate wake-up events.
1807 bool pci_dev_run_wake(struct pci_dev
*dev
)
1809 struct pci_bus
*bus
= dev
->bus
;
1811 if (device_run_wake(&dev
->dev
))
1814 if (!dev
->pme_support
)
1817 while (bus
->parent
) {
1818 struct pci_dev
*bridge
= bus
->self
;
1820 if (device_run_wake(&bridge
->dev
))
1826 /* We have reached the root bus. */
1828 return device_run_wake(bus
->bridge
);
1832 EXPORT_SYMBOL_GPL(pci_dev_run_wake
);
1835 * pci_pm_init - Initialize PM functions of given PCI device
1836 * @dev: PCI device to handle.
1838 void pci_pm_init(struct pci_dev
*dev
)
1843 pm_runtime_forbid(&dev
->dev
);
1844 device_enable_async_suspend(&dev
->dev
);
1845 dev
->wakeup_prepared
= false;
1849 /* find PCI PM capability in list */
1850 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
1853 /* Check device's ability to generate PME# */
1854 pci_read_config_word(dev
, pm
+ PCI_PM_PMC
, &pmc
);
1856 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
1857 dev_err(&dev
->dev
, "unsupported PM cap regs version (%u)\n",
1858 pmc
& PCI_PM_CAP_VER_MASK
);
1863 dev
->d3_delay
= PCI_PM_D3_WAIT
;
1865 dev
->d1_support
= false;
1866 dev
->d2_support
= false;
1867 if (!pci_no_d1d2(dev
)) {
1868 if (pmc
& PCI_PM_CAP_D1
)
1869 dev
->d1_support
= true;
1870 if (pmc
& PCI_PM_CAP_D2
)
1871 dev
->d2_support
= true;
1873 if (dev
->d1_support
|| dev
->d2_support
)
1874 dev_printk(KERN_DEBUG
, &dev
->dev
, "supports%s%s\n",
1875 dev
->d1_support
? " D1" : "",
1876 dev
->d2_support
? " D2" : "");
1879 pmc
&= PCI_PM_CAP_PME_MASK
;
1881 dev_printk(KERN_DEBUG
, &dev
->dev
,
1882 "PME# supported from%s%s%s%s%s\n",
1883 (pmc
& PCI_PM_CAP_PME_D0
) ? " D0" : "",
1884 (pmc
& PCI_PM_CAP_PME_D1
) ? " D1" : "",
1885 (pmc
& PCI_PM_CAP_PME_D2
) ? " D2" : "",
1886 (pmc
& PCI_PM_CAP_PME_D3
) ? " D3hot" : "",
1887 (pmc
& PCI_PM_CAP_PME_D3cold
) ? " D3cold" : "");
1888 dev
->pme_support
= pmc
>> PCI_PM_CAP_PME_SHIFT
;
1889 dev
->pme_poll
= true;
1891 * Make device's PM flags reflect the wake-up capability, but
1892 * let the user space enable it to wake up the system as needed.
1894 device_set_wakeup_capable(&dev
->dev
, true);
1895 /* Disable the PME# generation functionality */
1896 pci_pme_active(dev
, false);
1898 dev
->pme_support
= 0;
1903 * platform_pci_wakeup_init - init platform wakeup if present
1906 * Some devices don't have PCI PM caps but can still generate wakeup
1907 * events through platform methods (like ACPI events). If @dev supports
1908 * platform wakeup events, set the device flag to indicate as much. This
1909 * may be redundant if the device also supports PCI PM caps, but double
1910 * initialization should be safe in that case.
1912 void platform_pci_wakeup_init(struct pci_dev
*dev
)
1914 if (!platform_pci_can_wakeup(dev
))
1917 device_set_wakeup_capable(&dev
->dev
, true);
1918 platform_pci_sleep_wake(dev
, false);
1921 static void pci_add_saved_cap(struct pci_dev
*pci_dev
,
1922 struct pci_cap_saved_state
*new_cap
)
1924 hlist_add_head(&new_cap
->next
, &pci_dev
->saved_cap_space
);
1928 * pci_add_save_buffer - allocate buffer for saving given capability registers
1929 * @dev: the PCI device
1930 * @cap: the capability to allocate the buffer for
1931 * @size: requested size of the buffer
1933 static int pci_add_cap_save_buffer(
1934 struct pci_dev
*dev
, char cap
, unsigned int size
)
1937 struct pci_cap_saved_state
*save_state
;
1939 pos
= pci_find_capability(dev
, cap
);
1943 save_state
= kzalloc(sizeof(*save_state
) + size
, GFP_KERNEL
);
1947 save_state
->cap
.cap_nr
= cap
;
1948 save_state
->cap
.size
= size
;
1949 pci_add_saved_cap(dev
, save_state
);
1955 * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
1956 * @dev: the PCI device
1958 void pci_allocate_cap_save_buffers(struct pci_dev
*dev
)
1962 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_EXP
,
1963 PCI_EXP_SAVE_REGS
* sizeof(u16
));
1966 "unable to preallocate PCI Express save buffer\n");
1968 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_PCIX
, sizeof(u16
));
1971 "unable to preallocate PCI-X save buffer\n");
1974 void pci_free_cap_save_buffers(struct pci_dev
*dev
)
1976 struct pci_cap_saved_state
*tmp
;
1977 struct hlist_node
*pos
, *n
;
1979 hlist_for_each_entry_safe(tmp
, pos
, n
, &dev
->saved_cap_space
, next
)
1984 * pci_enable_ari - enable ARI forwarding if hardware support it
1985 * @dev: the PCI device
1987 void pci_enable_ari(struct pci_dev
*dev
)
1992 struct pci_dev
*bridge
;
1994 if (pcie_ari_disabled
|| !pci_is_pcie(dev
) || dev
->devfn
)
1997 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
);
2001 bridge
= dev
->bus
->self
;
2002 if (!bridge
|| !pci_is_pcie(bridge
))
2005 pos
= pci_pcie_cap(bridge
);
2009 /* ARI is a PCIe v2 feature */
2010 pci_read_config_word(bridge
, pos
+ PCI_EXP_FLAGS
, &flags
);
2011 if ((flags
& PCI_EXP_FLAGS_VERS
) < 2)
2014 pci_read_config_dword(bridge
, pos
+ PCI_EXP_DEVCAP2
, &cap
);
2015 if (!(cap
& PCI_EXP_DEVCAP2_ARI
))
2018 pci_read_config_word(bridge
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2019 ctrl
|= PCI_EXP_DEVCTL2_ARI
;
2020 pci_write_config_word(bridge
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2022 bridge
->ari_enabled
= 1;
2026 * pci_enable_ido - enable ID-based ordering on a device
2027 * @dev: the PCI device
2028 * @type: which types of IDO to enable
2030 * Enable ID-based ordering on @dev. @type can contain the bits
2031 * %PCI_EXP_IDO_REQUEST and/or %PCI_EXP_IDO_COMPLETION to indicate
2032 * which types of transactions are allowed to be re-ordered.
2034 void pci_enable_ido(struct pci_dev
*dev
, unsigned long type
)
2039 pos
= pci_pcie_cap(dev
);
2043 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2044 if (type
& PCI_EXP_IDO_REQUEST
)
2045 ctrl
|= PCI_EXP_IDO_REQ_EN
;
2046 if (type
& PCI_EXP_IDO_COMPLETION
)
2047 ctrl
|= PCI_EXP_IDO_CMP_EN
;
2048 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2050 EXPORT_SYMBOL(pci_enable_ido
);
2053 * pci_disable_ido - disable ID-based ordering on a device
2054 * @dev: the PCI device
2055 * @type: which types of IDO to disable
2057 void pci_disable_ido(struct pci_dev
*dev
, unsigned long type
)
2062 if (!pci_is_pcie(dev
))
2065 pos
= pci_pcie_cap(dev
);
2069 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2070 if (type
& PCI_EXP_IDO_REQUEST
)
2071 ctrl
&= ~PCI_EXP_IDO_REQ_EN
;
2072 if (type
& PCI_EXP_IDO_COMPLETION
)
2073 ctrl
&= ~PCI_EXP_IDO_CMP_EN
;
2074 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2076 EXPORT_SYMBOL(pci_disable_ido
);
2079 * pci_enable_obff - enable optimized buffer flush/fill
2081 * @type: type of signaling to use
2083 * Try to enable @type OBFF signaling on @dev. It will try using WAKE#
2084 * signaling if possible, falling back to message signaling only if
2085 * WAKE# isn't supported. @type should indicate whether the PCIe link
2086 * be brought out of L0s or L1 to send the message. It should be either
2087 * %PCI_EXP_OBFF_SIGNAL_ALWAYS or %PCI_OBFF_SIGNAL_L0.
2089 * If your device can benefit from receiving all messages, even at the
2090 * power cost of bringing the link back up from a low power state, use
2091 * %PCI_EXP_OBFF_SIGNAL_ALWAYS. Otherwise, use %PCI_OBFF_SIGNAL_L0 (the
2095 * Zero on success, appropriate error number on failure.
2097 int pci_enable_obff(struct pci_dev
*dev
, enum pci_obff_signal_type type
)
2104 if (!pci_is_pcie(dev
))
2107 pos
= pci_pcie_cap(dev
);
2111 pci_read_config_dword(dev
, pos
+ PCI_EXP_DEVCAP2
, &cap
);
2112 if (!(cap
& PCI_EXP_OBFF_MASK
))
2113 return -ENOTSUPP
; /* no OBFF support at all */
2115 /* Make sure the topology supports OBFF as well */
2117 ret
= pci_enable_obff(dev
->bus
->self
, type
);
2122 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2123 if (cap
& PCI_EXP_OBFF_WAKE
)
2124 ctrl
|= PCI_EXP_OBFF_WAKE_EN
;
2127 case PCI_EXP_OBFF_SIGNAL_L0
:
2128 if (!(ctrl
& PCI_EXP_OBFF_WAKE_EN
))
2129 ctrl
|= PCI_EXP_OBFF_MSGA_EN
;
2131 case PCI_EXP_OBFF_SIGNAL_ALWAYS
:
2132 ctrl
&= ~PCI_EXP_OBFF_WAKE_EN
;
2133 ctrl
|= PCI_EXP_OBFF_MSGB_EN
;
2136 WARN(1, "bad OBFF signal type\n");
2140 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2144 EXPORT_SYMBOL(pci_enable_obff
);
2147 * pci_disable_obff - disable optimized buffer flush/fill
2150 * Disable OBFF on @dev.
2152 void pci_disable_obff(struct pci_dev
*dev
)
2157 if (!pci_is_pcie(dev
))
2160 pos
= pci_pcie_cap(dev
);
2164 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2165 ctrl
&= ~PCI_EXP_OBFF_WAKE_EN
;
2166 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2168 EXPORT_SYMBOL(pci_disable_obff
);
2171 * pci_ltr_supported - check whether a device supports LTR
2175 * True if @dev supports latency tolerance reporting, false otherwise.
2177 bool pci_ltr_supported(struct pci_dev
*dev
)
2182 if (!pci_is_pcie(dev
))
2185 pos
= pci_pcie_cap(dev
);
2189 pci_read_config_dword(dev
, pos
+ PCI_EXP_DEVCAP2
, &cap
);
2191 return cap
& PCI_EXP_DEVCAP2_LTR
;
2193 EXPORT_SYMBOL(pci_ltr_supported
);
2196 * pci_enable_ltr - enable latency tolerance reporting
2199 * Enable LTR on @dev if possible, which means enabling it first on
2203 * Zero on success, errno on failure.
2205 int pci_enable_ltr(struct pci_dev
*dev
)
2211 if (!pci_ltr_supported(dev
))
2214 pos
= pci_pcie_cap(dev
);
2218 /* Only primary function can enable/disable LTR */
2219 if (PCI_FUNC(dev
->devfn
) != 0)
2222 /* Enable upstream ports first */
2224 ret
= pci_enable_ltr(dev
->bus
->self
);
2229 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2230 ctrl
|= PCI_EXP_LTR_EN
;
2231 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2235 EXPORT_SYMBOL(pci_enable_ltr
);
2238 * pci_disable_ltr - disable latency tolerance reporting
2241 void pci_disable_ltr(struct pci_dev
*dev
)
2246 if (!pci_ltr_supported(dev
))
2249 pos
= pci_pcie_cap(dev
);
2253 /* Only primary function can enable/disable LTR */
2254 if (PCI_FUNC(dev
->devfn
) != 0)
2257 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
2258 ctrl
&= ~PCI_EXP_LTR_EN
;
2259 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
2261 EXPORT_SYMBOL(pci_disable_ltr
);
2263 static int __pci_ltr_scale(int *val
)
2267 while (*val
> 1023) {
2268 *val
= (*val
+ 31) / 32;
2275 * pci_set_ltr - set LTR latency values
2277 * @snoop_lat_ns: snoop latency in nanoseconds
2278 * @nosnoop_lat_ns: nosnoop latency in nanoseconds
2280 * Figure out the scale and set the LTR values accordingly.
2282 int pci_set_ltr(struct pci_dev
*dev
, int snoop_lat_ns
, int nosnoop_lat_ns
)
2284 int pos
, ret
, snoop_scale
, nosnoop_scale
;
2287 if (!pci_ltr_supported(dev
))
2290 snoop_scale
= __pci_ltr_scale(&snoop_lat_ns
);
2291 nosnoop_scale
= __pci_ltr_scale(&nosnoop_lat_ns
);
2293 if (snoop_lat_ns
> PCI_LTR_VALUE_MASK
||
2294 nosnoop_lat_ns
> PCI_LTR_VALUE_MASK
)
2297 if ((snoop_scale
> (PCI_LTR_SCALE_MASK
>> PCI_LTR_SCALE_SHIFT
)) ||
2298 (nosnoop_scale
> (PCI_LTR_SCALE_MASK
>> PCI_LTR_SCALE_SHIFT
)))
2301 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_LTR
);
2305 val
= (snoop_scale
<< PCI_LTR_SCALE_SHIFT
) | snoop_lat_ns
;
2306 ret
= pci_write_config_word(dev
, pos
+ PCI_LTR_MAX_SNOOP_LAT
, val
);
2310 val
= (nosnoop_scale
<< PCI_LTR_SCALE_SHIFT
) | nosnoop_lat_ns
;
2311 ret
= pci_write_config_word(dev
, pos
+ PCI_LTR_MAX_NOSNOOP_LAT
, val
);
2317 EXPORT_SYMBOL(pci_set_ltr
);
2319 static int pci_acs_enable
;
2322 * pci_request_acs - ask for ACS to be enabled if supported
2324 void pci_request_acs(void)
2330 * pci_enable_acs - enable ACS if hardware support it
2331 * @dev: the PCI device
2333 void pci_enable_acs(struct pci_dev
*dev
)
2339 if (!pci_acs_enable
)
2342 if (!pci_is_pcie(dev
))
2345 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ACS
);
2349 pci_read_config_word(dev
, pos
+ PCI_ACS_CAP
, &cap
);
2350 pci_read_config_word(dev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2352 /* Source Validation */
2353 ctrl
|= (cap
& PCI_ACS_SV
);
2355 /* P2P Request Redirect */
2356 ctrl
|= (cap
& PCI_ACS_RR
);
2358 /* P2P Completion Redirect */
2359 ctrl
|= (cap
& PCI_ACS_CR
);
2361 /* Upstream Forwarding */
2362 ctrl
|= (cap
& PCI_ACS_UF
);
2364 pci_write_config_word(dev
, pos
+ PCI_ACS_CTRL
, ctrl
);
2368 * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
2369 * @dev: the PCI device
2370 * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD)
2372 * Perform INTx swizzling for a device behind one level of bridge. This is
2373 * required by section 9.1 of the PCI-to-PCI bridge specification for devices
2374 * behind bridges on add-in cards. For devices with ARI enabled, the slot
2375 * number is always 0 (see the Implementation Note in section 2.2.8.1 of
2376 * the PCI Express Base Specification, Revision 2.1)
2378 u8
pci_swizzle_interrupt_pin(const struct pci_dev
*dev
, u8 pin
)
2382 if (pci_ari_enabled(dev
->bus
))
2385 slot
= PCI_SLOT(dev
->devfn
);
2387 return (((pin
- 1) + slot
) % 4) + 1;
2391 pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
2399 while (!pci_is_root_bus(dev
->bus
)) {
2400 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2401 dev
= dev
->bus
->self
;
2408 * pci_common_swizzle - swizzle INTx all the way to root bridge
2409 * @dev: the PCI device
2410 * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
2412 * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
2413 * bridges all the way up to a PCI root bus.
2415 u8
pci_common_swizzle(struct pci_dev
*dev
, u8
*pinp
)
2419 while (!pci_is_root_bus(dev
->bus
)) {
2420 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2421 dev
= dev
->bus
->self
;
2424 return PCI_SLOT(dev
->devfn
);
2428 * pci_release_region - Release a PCI bar
2429 * @pdev: PCI device whose resources were previously reserved by pci_request_region
2430 * @bar: BAR to release
2432 * Releases the PCI I/O and memory resources previously reserved by a
2433 * successful call to pci_request_region. Call this function only
2434 * after all use of the PCI regions has ceased.
2436 void pci_release_region(struct pci_dev
*pdev
, int bar
)
2438 struct pci_devres
*dr
;
2440 if (pci_resource_len(pdev
, bar
) == 0)
2442 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
2443 release_region(pci_resource_start(pdev
, bar
),
2444 pci_resource_len(pdev
, bar
));
2445 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
2446 release_mem_region(pci_resource_start(pdev
, bar
),
2447 pci_resource_len(pdev
, bar
));
2449 dr
= find_pci_dr(pdev
);
2451 dr
->region_mask
&= ~(1 << bar
);
2455 * __pci_request_region - Reserved PCI I/O and memory resource
2456 * @pdev: PCI device whose resources are to be reserved
2457 * @bar: BAR to be reserved
2458 * @res_name: Name to be associated with resource.
2459 * @exclusive: whether the region access is exclusive or not
2461 * Mark the PCI region associated with PCI device @pdev BR @bar as
2462 * being reserved by owner @res_name. Do not access any
2463 * address inside the PCI regions unless this call returns
2466 * If @exclusive is set, then the region is marked so that userspace
2467 * is explicitly not allowed to map the resource via /dev/mem or
2468 * sysfs MMIO access.
2470 * Returns 0 on success, or %EBUSY on error. A warning
2471 * message is also printed on failure.
2473 static int __pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
,
2476 struct pci_devres
*dr
;
2478 if (pci_resource_len(pdev
, bar
) == 0)
2481 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
2482 if (!request_region(pci_resource_start(pdev
, bar
),
2483 pci_resource_len(pdev
, bar
), res_name
))
2486 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
2487 if (!__request_mem_region(pci_resource_start(pdev
, bar
),
2488 pci_resource_len(pdev
, bar
), res_name
,
2493 dr
= find_pci_dr(pdev
);
2495 dr
->region_mask
|= 1 << bar
;
2500 dev_warn(&pdev
->dev
, "BAR %d: can't reserve %pR\n", bar
,
2501 &pdev
->resource
[bar
]);
2506 * pci_request_region - Reserve PCI I/O and memory resource
2507 * @pdev: PCI device whose resources are to be reserved
2508 * @bar: BAR to be reserved
2509 * @res_name: Name to be associated with resource
2511 * Mark the PCI region associated with PCI device @pdev BAR @bar as
2512 * being reserved by owner @res_name. Do not access any
2513 * address inside the PCI regions unless this call returns
2516 * Returns 0 on success, or %EBUSY on error. A warning
2517 * message is also printed on failure.
2519 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
2521 return __pci_request_region(pdev
, bar
, res_name
, 0);
2525 * pci_request_region_exclusive - Reserved PCI I/O and memory resource
2526 * @pdev: PCI device whose resources are to be reserved
2527 * @bar: BAR to be reserved
2528 * @res_name: Name to be associated with resource.
2530 * Mark the PCI region associated with PCI device @pdev BR @bar as
2531 * being reserved by owner @res_name. Do not access any
2532 * address inside the PCI regions unless this call returns
2535 * Returns 0 on success, or %EBUSY on error. A warning
2536 * message is also printed on failure.
2538 * The key difference that _exclusive makes it that userspace is
2539 * explicitly not allowed to map the resource via /dev/mem or
2542 int pci_request_region_exclusive(struct pci_dev
*pdev
, int bar
, const char *res_name
)
2544 return __pci_request_region(pdev
, bar
, res_name
, IORESOURCE_EXCLUSIVE
);
2547 * pci_release_selected_regions - Release selected PCI I/O and memory resources
2548 * @pdev: PCI device whose resources were previously reserved
2549 * @bars: Bitmask of BARs to be released
2551 * Release selected PCI I/O and memory resources previously reserved.
2552 * Call this function only after all use of the PCI regions has ceased.
2554 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
2558 for (i
= 0; i
< 6; i
++)
2559 if (bars
& (1 << i
))
2560 pci_release_region(pdev
, i
);
2563 int __pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
2564 const char *res_name
, int excl
)
2568 for (i
= 0; i
< 6; i
++)
2569 if (bars
& (1 << i
))
2570 if (__pci_request_region(pdev
, i
, res_name
, excl
))
2576 if (bars
& (1 << i
))
2577 pci_release_region(pdev
, i
);
2584 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
2585 * @pdev: PCI device whose resources are to be reserved
2586 * @bars: Bitmask of BARs to be requested
2587 * @res_name: Name to be associated with resource
2589 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
2590 const char *res_name
)
2592 return __pci_request_selected_regions(pdev
, bars
, res_name
, 0);
2595 int pci_request_selected_regions_exclusive(struct pci_dev
*pdev
,
2596 int bars
, const char *res_name
)
2598 return __pci_request_selected_regions(pdev
, bars
, res_name
,
2599 IORESOURCE_EXCLUSIVE
);
2603 * pci_release_regions - Release reserved PCI I/O and memory resources
2604 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
2606 * Releases all PCI I/O and memory resources previously reserved by a
2607 * successful call to pci_request_regions. Call this function only
2608 * after all use of the PCI regions has ceased.
2611 void pci_release_regions(struct pci_dev
*pdev
)
2613 pci_release_selected_regions(pdev
, (1 << 6) - 1);
2617 * pci_request_regions - Reserved PCI I/O and memory resources
2618 * @pdev: PCI device whose resources are to be reserved
2619 * @res_name: Name to be associated with resource.
2621 * Mark all PCI regions associated with PCI device @pdev as
2622 * being reserved by owner @res_name. Do not access any
2623 * address inside the PCI regions unless this call returns
2626 * Returns 0 on success, or %EBUSY on error. A warning
2627 * message is also printed on failure.
2629 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
2631 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
2635 * pci_request_regions_exclusive - Reserved PCI I/O and memory resources
2636 * @pdev: PCI device whose resources are to be reserved
2637 * @res_name: Name to be associated with resource.
2639 * Mark all PCI regions associated with PCI device @pdev as
2640 * being reserved by owner @res_name. Do not access any
2641 * address inside the PCI regions unless this call returns
2644 * pci_request_regions_exclusive() will mark the region so that
2645 * /dev/mem and the sysfs MMIO access will not be allowed.
2647 * Returns 0 on success, or %EBUSY on error. A warning
2648 * message is also printed on failure.
2650 int pci_request_regions_exclusive(struct pci_dev
*pdev
, const char *res_name
)
2652 return pci_request_selected_regions_exclusive(pdev
,
2653 ((1 << 6) - 1), res_name
);
2656 static void __pci_set_master(struct pci_dev
*dev
, bool enable
)
2660 pci_read_config_word(dev
, PCI_COMMAND
, &old_cmd
);
2662 cmd
= old_cmd
| PCI_COMMAND_MASTER
;
2664 cmd
= old_cmd
& ~PCI_COMMAND_MASTER
;
2665 if (cmd
!= old_cmd
) {
2666 dev_dbg(&dev
->dev
, "%s bus mastering\n",
2667 enable
? "enabling" : "disabling");
2668 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2670 dev
->is_busmaster
= enable
;
2674 * pcibios_set_master - enable PCI bus-mastering for device dev
2675 * @dev: the PCI device to enable
2677 * Enables PCI bus-mastering for the device. This is the default
2678 * implementation. Architecture specific implementations can override
2679 * this if necessary.
2681 void __weak
pcibios_set_master(struct pci_dev
*dev
)
2685 /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
2686 if (pci_is_pcie(dev
))
2689 pci_read_config_byte(dev
, PCI_LATENCY_TIMER
, &lat
);
2691 lat
= (64 <= pcibios_max_latency
) ? 64 : pcibios_max_latency
;
2692 else if (lat
> pcibios_max_latency
)
2693 lat
= pcibios_max_latency
;
2696 dev_printk(KERN_DEBUG
, &dev
->dev
, "setting latency timer to %d\n", lat
);
2697 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, lat
);
2701 * pci_set_master - enables bus-mastering for device dev
2702 * @dev: the PCI device to enable
2704 * Enables bus-mastering on the device and calls pcibios_set_master()
2705 * to do the needed arch specific settings.
2707 void pci_set_master(struct pci_dev
*dev
)
2709 __pci_set_master(dev
, true);
2710 pcibios_set_master(dev
);
2714 * pci_clear_master - disables bus-mastering for device dev
2715 * @dev: the PCI device to disable
2717 void pci_clear_master(struct pci_dev
*dev
)
2719 __pci_set_master(dev
, false);
2723 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
2724 * @dev: the PCI device for which MWI is to be enabled
2726 * Helper function for pci_set_mwi.
2727 * Originally copied from drivers/net/acenic.c.
2728 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
2730 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2732 int pci_set_cacheline_size(struct pci_dev
*dev
)
2736 if (!pci_cache_line_size
)
2739 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
2740 equal to or multiple of the right value. */
2741 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
2742 if (cacheline_size
>= pci_cache_line_size
&&
2743 (cacheline_size
% pci_cache_line_size
) == 0)
2746 /* Write the correct value. */
2747 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
2749 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
2750 if (cacheline_size
== pci_cache_line_size
)
2753 dev_printk(KERN_DEBUG
, &dev
->dev
, "cache line size of %d is not "
2754 "supported\n", pci_cache_line_size
<< 2);
2758 EXPORT_SYMBOL_GPL(pci_set_cacheline_size
);
2760 #ifdef PCI_DISABLE_MWI
2761 int pci_set_mwi(struct pci_dev
*dev
)
2766 int pci_try_set_mwi(struct pci_dev
*dev
)
2771 void pci_clear_mwi(struct pci_dev
*dev
)
2778 * pci_set_mwi - enables memory-write-invalidate PCI transaction
2779 * @dev: the PCI device for which MWI is enabled
2781 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
2783 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2786 pci_set_mwi(struct pci_dev
*dev
)
2791 rc
= pci_set_cacheline_size(dev
);
2795 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
2796 if (! (cmd
& PCI_COMMAND_INVALIDATE
)) {
2797 dev_dbg(&dev
->dev
, "enabling Mem-Wr-Inval\n");
2798 cmd
|= PCI_COMMAND_INVALIDATE
;
2799 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2806 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
2807 * @dev: the PCI device for which MWI is enabled
2809 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
2810 * Callers are not required to check the return value.
2812 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2814 int pci_try_set_mwi(struct pci_dev
*dev
)
2816 int rc
= pci_set_mwi(dev
);
2821 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
2822 * @dev: the PCI device to disable
2824 * Disables PCI Memory-Write-Invalidate transaction on the device
2827 pci_clear_mwi(struct pci_dev
*dev
)
2831 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
2832 if (cmd
& PCI_COMMAND_INVALIDATE
) {
2833 cmd
&= ~PCI_COMMAND_INVALIDATE
;
2834 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2837 #endif /* ! PCI_DISABLE_MWI */
2840 * pci_intx - enables/disables PCI INTx for device dev
2841 * @pdev: the PCI device to operate on
2842 * @enable: boolean: whether to enable or disable PCI INTx
2844 * Enables/disables PCI INTx for device dev
2847 pci_intx(struct pci_dev
*pdev
, int enable
)
2849 u16 pci_command
, new;
2851 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
2854 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
2856 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
2859 if (new != pci_command
) {
2860 struct pci_devres
*dr
;
2862 pci_write_config_word(pdev
, PCI_COMMAND
, new);
2864 dr
= find_pci_dr(pdev
);
2865 if (dr
&& !dr
->restore_intx
) {
2866 dr
->restore_intx
= 1;
2867 dr
->orig_intx
= !enable
;
2873 * pci_intx_mask_supported - probe for INTx masking support
2874 * @dev: the PCI device to operate on
2876 * Check if the device dev support INTx masking via the config space
2879 bool pci_intx_mask_supported(struct pci_dev
*dev
)
2881 bool mask_supported
= false;
2884 pci_cfg_access_lock(dev
);
2886 pci_read_config_word(dev
, PCI_COMMAND
, &orig
);
2887 pci_write_config_word(dev
, PCI_COMMAND
,
2888 orig
^ PCI_COMMAND_INTX_DISABLE
);
2889 pci_read_config_word(dev
, PCI_COMMAND
, &new);
2892 * There's no way to protect against hardware bugs or detect them
2893 * reliably, but as long as we know what the value should be, let's
2894 * go ahead and check it.
2896 if ((new ^ orig
) & ~PCI_COMMAND_INTX_DISABLE
) {
2897 dev_err(&dev
->dev
, "Command register changed from "
2898 "0x%x to 0x%x: driver or hardware bug?\n", orig
, new);
2899 } else if ((new ^ orig
) & PCI_COMMAND_INTX_DISABLE
) {
2900 mask_supported
= true;
2901 pci_write_config_word(dev
, PCI_COMMAND
, orig
);
2904 pci_cfg_access_unlock(dev
);
2905 return mask_supported
;
2907 EXPORT_SYMBOL_GPL(pci_intx_mask_supported
);
2909 static bool pci_check_and_set_intx_mask(struct pci_dev
*dev
, bool mask
)
2911 struct pci_bus
*bus
= dev
->bus
;
2912 bool mask_updated
= true;
2913 u32 cmd_status_dword
;
2914 u16 origcmd
, newcmd
;
2915 unsigned long flags
;
2919 * We do a single dword read to retrieve both command and status.
2920 * Document assumptions that make this possible.
2922 BUILD_BUG_ON(PCI_COMMAND
% 4);
2923 BUILD_BUG_ON(PCI_COMMAND
+ 2 != PCI_STATUS
);
2925 raw_spin_lock_irqsave(&pci_lock
, flags
);
2927 bus
->ops
->read(bus
, dev
->devfn
, PCI_COMMAND
, 4, &cmd_status_dword
);
2929 irq_pending
= (cmd_status_dword
>> 16) & PCI_STATUS_INTERRUPT
;
2932 * Check interrupt status register to see whether our device
2933 * triggered the interrupt (when masking) or the next IRQ is
2934 * already pending (when unmasking).
2936 if (mask
!= irq_pending
) {
2937 mask_updated
= false;
2941 origcmd
= cmd_status_dword
;
2942 newcmd
= origcmd
& ~PCI_COMMAND_INTX_DISABLE
;
2944 newcmd
|= PCI_COMMAND_INTX_DISABLE
;
2945 if (newcmd
!= origcmd
)
2946 bus
->ops
->write(bus
, dev
->devfn
, PCI_COMMAND
, 2, newcmd
);
2949 raw_spin_unlock_irqrestore(&pci_lock
, flags
);
2951 return mask_updated
;
2955 * pci_check_and_mask_intx - mask INTx on pending interrupt
2956 * @dev: the PCI device to operate on
2958 * Check if the device dev has its INTx line asserted, mask it and
2959 * return true in that case. False is returned if not interrupt was
2962 bool pci_check_and_mask_intx(struct pci_dev
*dev
)
2964 return pci_check_and_set_intx_mask(dev
, true);
2966 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx
);
2969 * pci_check_and_mask_intx - unmask INTx of no interrupt is pending
2970 * @dev: the PCI device to operate on
2972 * Check if the device dev has its INTx line asserted, unmask it if not
2973 * and return true. False is returned and the mask remains active if
2974 * there was still an interrupt pending.
2976 bool pci_check_and_unmask_intx(struct pci_dev
*dev
)
2978 return pci_check_and_set_intx_mask(dev
, false);
2980 EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx
);
2983 * pci_msi_off - disables any msi or msix capabilities
2984 * @dev: the PCI device to operate on
2986 * If you want to use msi see pci_enable_msi and friends.
2987 * This is a lower level primitive that allows us to disable
2988 * msi operation at the device level.
2990 void pci_msi_off(struct pci_dev
*dev
)
2995 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSI
);
2997 pci_read_config_word(dev
, pos
+ PCI_MSI_FLAGS
, &control
);
2998 control
&= ~PCI_MSI_FLAGS_ENABLE
;
2999 pci_write_config_word(dev
, pos
+ PCI_MSI_FLAGS
, control
);
3001 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSIX
);
3003 pci_read_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, &control
);
3004 control
&= ~PCI_MSIX_FLAGS_ENABLE
;
3005 pci_write_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, control
);
3008 EXPORT_SYMBOL_GPL(pci_msi_off
);
3010 int pci_set_dma_max_seg_size(struct pci_dev
*dev
, unsigned int size
)
3012 return dma_set_max_seg_size(&dev
->dev
, size
);
3014 EXPORT_SYMBOL(pci_set_dma_max_seg_size
);
3016 int pci_set_dma_seg_boundary(struct pci_dev
*dev
, unsigned long mask
)
3018 return dma_set_seg_boundary(&dev
->dev
, mask
);
3020 EXPORT_SYMBOL(pci_set_dma_seg_boundary
);
3022 static int pcie_flr(struct pci_dev
*dev
, int probe
)
3027 u16 status
, control
;
3029 pos
= pci_pcie_cap(dev
);
3033 pci_read_config_dword(dev
, pos
+ PCI_EXP_DEVCAP
, &cap
);
3034 if (!(cap
& PCI_EXP_DEVCAP_FLR
))
3040 /* Wait for Transaction Pending bit clean */
3041 for (i
= 0; i
< 4; i
++) {
3043 msleep((1 << (i
- 1)) * 100);
3045 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVSTA
, &status
);
3046 if (!(status
& PCI_EXP_DEVSTA_TRPND
))
3050 dev_err(&dev
->dev
, "transaction is not cleared; "
3051 "proceeding with reset anyway\n");
3054 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &control
);
3055 control
|= PCI_EXP_DEVCTL_BCR_FLR
;
3056 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, control
);
3063 static int pci_af_flr(struct pci_dev
*dev
, int probe
)
3070 pos
= pci_find_capability(dev
, PCI_CAP_ID_AF
);
3074 pci_read_config_byte(dev
, pos
+ PCI_AF_CAP
, &cap
);
3075 if (!(cap
& PCI_AF_CAP_TP
) || !(cap
& PCI_AF_CAP_FLR
))
3081 /* Wait for Transaction Pending bit clean */
3082 for (i
= 0; i
< 4; i
++) {
3084 msleep((1 << (i
- 1)) * 100);
3086 pci_read_config_byte(dev
, pos
+ PCI_AF_STATUS
, &status
);
3087 if (!(status
& PCI_AF_STATUS_TP
))
3091 dev_err(&dev
->dev
, "transaction is not cleared; "
3092 "proceeding with reset anyway\n");
3095 pci_write_config_byte(dev
, pos
+ PCI_AF_CTRL
, PCI_AF_CTRL_FLR
);
3102 * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
3103 * @dev: Device to reset.
3104 * @probe: If set, only check if the device can be reset this way.
3106 * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
3107 * unset, it will be reinitialized internally when going from PCI_D3hot to
3108 * PCI_D0. If that's the case and the device is not in a low-power state
3109 * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
3111 * NOTE: This causes the caller to sleep for twice the device power transition
3112 * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
3113 * by devault (i.e. unless the @dev's d3_delay field has a different value).
3114 * Moreover, only devices in D0 can be reset by this function.
3116 static int pci_pm_reset(struct pci_dev
*dev
, int probe
)
3123 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &csr
);
3124 if (csr
& PCI_PM_CTRL_NO_SOFT_RESET
)
3130 if (dev
->current_state
!= PCI_D0
)
3133 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3135 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3136 pci_dev_d3_sleep(dev
);
3138 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3140 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3141 pci_dev_d3_sleep(dev
);
3146 static int pci_parent_bus_reset(struct pci_dev
*dev
, int probe
)
3149 struct pci_dev
*pdev
;
3151 if (pci_is_root_bus(dev
->bus
) || dev
->subordinate
|| !dev
->bus
->self
)
3154 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
3161 pci_read_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, &ctrl
);
3162 ctrl
|= PCI_BRIDGE_CTL_BUS_RESET
;
3163 pci_write_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, ctrl
);
3166 ctrl
&= ~PCI_BRIDGE_CTL_BUS_RESET
;
3167 pci_write_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, ctrl
);
3173 static int __pci_dev_reset(struct pci_dev
*dev
, int probe
)
3179 rc
= pci_dev_specific_reset(dev
, probe
);
3183 rc
= pcie_flr(dev
, probe
);
3187 rc
= pci_af_flr(dev
, probe
);
3191 rc
= pci_pm_reset(dev
, probe
);
3195 rc
= pci_parent_bus_reset(dev
, probe
);
3200 static int pci_dev_reset(struct pci_dev
*dev
, int probe
)
3205 pci_cfg_access_lock(dev
);
3206 /* block PM suspend, driver probe, etc. */
3207 device_lock(&dev
->dev
);
3210 rc
= __pci_dev_reset(dev
, probe
);
3213 device_unlock(&dev
->dev
);
3214 pci_cfg_access_unlock(dev
);
3219 * __pci_reset_function - reset a PCI device function
3220 * @dev: PCI device to reset
3222 * Some devices allow an individual function to be reset without affecting
3223 * other functions in the same device. The PCI device must be responsive
3224 * to PCI config space in order to use this function.
3226 * The device function is presumed to be unused when this function is called.
3227 * Resetting the device will make the contents of PCI configuration space
3228 * random, so any caller of this must be prepared to reinitialise the
3229 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
3232 * Returns 0 if the device function was successfully reset or negative if the
3233 * device doesn't support resetting a single function.
3235 int __pci_reset_function(struct pci_dev
*dev
)
3237 return pci_dev_reset(dev
, 0);
3239 EXPORT_SYMBOL_GPL(__pci_reset_function
);
3242 * __pci_reset_function_locked - reset a PCI device function while holding
3243 * the @dev mutex lock.
3244 * @dev: PCI device to reset
3246 * Some devices allow an individual function to be reset without affecting
3247 * other functions in the same device. The PCI device must be responsive
3248 * to PCI config space in order to use this function.
3250 * The device function is presumed to be unused and the caller is holding
3251 * the device mutex lock when this function is called.
3252 * Resetting the device will make the contents of PCI configuration space
3253 * random, so any caller of this must be prepared to reinitialise the
3254 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
3257 * Returns 0 if the device function was successfully reset or negative if the
3258 * device doesn't support resetting a single function.
3260 int __pci_reset_function_locked(struct pci_dev
*dev
)
3262 return __pci_dev_reset(dev
, 0);
3264 EXPORT_SYMBOL_GPL(__pci_reset_function_locked
);
3267 * pci_probe_reset_function - check whether the device can be safely reset
3268 * @dev: PCI device to reset
3270 * Some devices allow an individual function to be reset without affecting
3271 * other functions in the same device. The PCI device must be responsive
3272 * to PCI config space in order to use this function.
3274 * Returns 0 if the device function can be reset or negative if the
3275 * device doesn't support resetting a single function.
3277 int pci_probe_reset_function(struct pci_dev
*dev
)
3279 return pci_dev_reset(dev
, 1);
3283 * pci_reset_function - quiesce and reset a PCI device function
3284 * @dev: PCI device to reset
3286 * Some devices allow an individual function to be reset without affecting
3287 * other functions in the same device. The PCI device must be responsive
3288 * to PCI config space in order to use this function.
3290 * This function does not just reset the PCI portion of a device, but
3291 * clears all the state associated with the device. This function differs
3292 * from __pci_reset_function in that it saves and restores device state
3295 * Returns 0 if the device function was successfully reset or negative if the
3296 * device doesn't support resetting a single function.
3298 int pci_reset_function(struct pci_dev
*dev
)
3302 rc
= pci_dev_reset(dev
, 1);
3306 pci_save_state(dev
);
3309 * both INTx and MSI are disabled after the Interrupt Disable bit
3310 * is set and the Bus Master bit is cleared.
3312 pci_write_config_word(dev
, PCI_COMMAND
, PCI_COMMAND_INTX_DISABLE
);
3314 rc
= pci_dev_reset(dev
, 0);
3316 pci_restore_state(dev
);
3320 EXPORT_SYMBOL_GPL(pci_reset_function
);
3323 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
3324 * @dev: PCI device to query
3326 * Returns mmrbc: maximum designed memory read count in bytes
3327 * or appropriate error value.
3329 int pcix_get_max_mmrbc(struct pci_dev
*dev
)
3334 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
3338 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
3341 return 512 << ((stat
& PCI_X_STATUS_MAX_READ
) >> 21);
3343 EXPORT_SYMBOL(pcix_get_max_mmrbc
);
3346 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
3347 * @dev: PCI device to query
3349 * Returns mmrbc: maximum memory read count in bytes
3350 * or appropriate error value.
3352 int pcix_get_mmrbc(struct pci_dev
*dev
)
3357 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
3361 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
3364 return 512 << ((cmd
& PCI_X_CMD_MAX_READ
) >> 2);
3366 EXPORT_SYMBOL(pcix_get_mmrbc
);
3369 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
3370 * @dev: PCI device to query
3371 * @mmrbc: maximum memory read count in bytes
3372 * valid values are 512, 1024, 2048, 4096
3374 * If possible sets maximum memory read byte count, some bridges have erratas
3375 * that prevent this.
3377 int pcix_set_mmrbc(struct pci_dev
*dev
, int mmrbc
)
3383 if (mmrbc
< 512 || mmrbc
> 4096 || !is_power_of_2(mmrbc
))
3386 v
= ffs(mmrbc
) - 10;
3388 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
3392 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
3395 if (v
> (stat
& PCI_X_STATUS_MAX_READ
) >> 21)
3398 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
3401 o
= (cmd
& PCI_X_CMD_MAX_READ
) >> 2;
3403 if (v
> o
&& dev
->bus
&&
3404 (dev
->bus
->bus_flags
& PCI_BUS_FLAGS_NO_MMRBC
))
3407 cmd
&= ~PCI_X_CMD_MAX_READ
;
3409 if (pci_write_config_word(dev
, cap
+ PCI_X_CMD
, cmd
))
3414 EXPORT_SYMBOL(pcix_set_mmrbc
);
3417 * pcie_get_readrq - get PCI Express read request size
3418 * @dev: PCI device to query
3420 * Returns maximum memory read request in bytes
3421 * or appropriate error value.
3423 int pcie_get_readrq(struct pci_dev
*dev
)
3428 cap
= pci_pcie_cap(dev
);
3432 ret
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
3434 ret
= 128 << ((ctl
& PCI_EXP_DEVCTL_READRQ
) >> 12);
3438 EXPORT_SYMBOL(pcie_get_readrq
);
3441 * pcie_set_readrq - set PCI Express maximum memory read request
3442 * @dev: PCI device to query
3443 * @rq: maximum memory read count in bytes
3444 * valid values are 128, 256, 512, 1024, 2048, 4096
3446 * If possible sets maximum memory read request in bytes
3448 int pcie_set_readrq(struct pci_dev
*dev
, int rq
)
3450 int cap
, err
= -EINVAL
;
3453 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
3456 cap
= pci_pcie_cap(dev
);
3460 err
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
3464 * If using the "performance" PCIe config, we clamp the
3465 * read rq size to the max packet size to prevent the
3466 * host bridge generating requests larger than we can
3469 if (pcie_bus_config
== PCIE_BUS_PERFORMANCE
) {
3470 int mps
= pcie_get_mps(dev
);
3478 v
= (ffs(rq
) - 8) << 12;
3480 if ((ctl
& PCI_EXP_DEVCTL_READRQ
) != v
) {
3481 ctl
&= ~PCI_EXP_DEVCTL_READRQ
;
3483 err
= pci_write_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, ctl
);
3489 EXPORT_SYMBOL(pcie_set_readrq
);
3492 * pcie_get_mps - get PCI Express maximum payload size
3493 * @dev: PCI device to query
3495 * Returns maximum payload size in bytes
3496 * or appropriate error value.
3498 int pcie_get_mps(struct pci_dev
*dev
)
3503 cap
= pci_pcie_cap(dev
);
3507 ret
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
3509 ret
= 128 << ((ctl
& PCI_EXP_DEVCTL_PAYLOAD
) >> 5);
3515 * pcie_set_mps - set PCI Express maximum payload size
3516 * @dev: PCI device to query
3517 * @mps: maximum payload size in bytes
3518 * valid values are 128, 256, 512, 1024, 2048, 4096
3520 * If possible sets maximum payload size
3522 int pcie_set_mps(struct pci_dev
*dev
, int mps
)
3524 int cap
, err
= -EINVAL
;
3527 if (mps
< 128 || mps
> 4096 || !is_power_of_2(mps
))
3531 if (v
> dev
->pcie_mpss
)
3535 cap
= pci_pcie_cap(dev
);
3539 err
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
3543 if ((ctl
& PCI_EXP_DEVCTL_PAYLOAD
) != v
) {
3544 ctl
&= ~PCI_EXP_DEVCTL_PAYLOAD
;
3546 err
= pci_write_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, ctl
);
3553 * pci_select_bars - Make BAR mask from the type of resource
3554 * @dev: the PCI device for which BAR mask is made
3555 * @flags: resource type mask to be selected
3557 * This helper routine makes bar mask from the type of resource.
3559 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
3562 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
3563 if (pci_resource_flags(dev
, i
) & flags
)
3569 * pci_resource_bar - get position of the BAR associated with a resource
3570 * @dev: the PCI device
3571 * @resno: the resource number
3572 * @type: the BAR type to be filled in
3574 * Returns BAR position in config space, or 0 if the BAR is invalid.
3576 int pci_resource_bar(struct pci_dev
*dev
, int resno
, enum pci_bar_type
*type
)
3580 if (resno
< PCI_ROM_RESOURCE
) {
3581 *type
= pci_bar_unknown
;
3582 return PCI_BASE_ADDRESS_0
+ 4 * resno
;
3583 } else if (resno
== PCI_ROM_RESOURCE
) {
3584 *type
= pci_bar_mem32
;
3585 return dev
->rom_base_reg
;
3586 } else if (resno
< PCI_BRIDGE_RESOURCES
) {
3587 /* device specific resource */
3588 reg
= pci_iov_resource_bar(dev
, resno
, type
);
3593 dev_err(&dev
->dev
, "BAR %d: invalid resource\n", resno
);
3597 /* Some architectures require additional programming to enable VGA */
3598 static arch_set_vga_state_t arch_set_vga_state
;
3600 void __init
pci_register_set_vga_state(arch_set_vga_state_t func
)
3602 arch_set_vga_state
= func
; /* NULL disables */
3605 static int pci_set_vga_state_arch(struct pci_dev
*dev
, bool decode
,
3606 unsigned int command_bits
, u32 flags
)
3608 if (arch_set_vga_state
)
3609 return arch_set_vga_state(dev
, decode
, command_bits
,
3615 * pci_set_vga_state - set VGA decode state on device and parents if requested
3616 * @dev: the PCI device
3617 * @decode: true = enable decoding, false = disable decoding
3618 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
3619 * @flags: traverse ancestors and change bridges
3620 * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
3622 int pci_set_vga_state(struct pci_dev
*dev
, bool decode
,
3623 unsigned int command_bits
, u32 flags
)
3625 struct pci_bus
*bus
;
3626 struct pci_dev
*bridge
;
3630 WARN_ON((flags
& PCI_VGA_STATE_CHANGE_DECODES
) & (command_bits
& ~(PCI_COMMAND_IO
|PCI_COMMAND_MEMORY
)));
3632 /* ARCH specific VGA enables */
3633 rc
= pci_set_vga_state_arch(dev
, decode
, command_bits
, flags
);
3637 if (flags
& PCI_VGA_STATE_CHANGE_DECODES
) {
3638 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3640 cmd
|= command_bits
;
3642 cmd
&= ~command_bits
;
3643 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3646 if (!(flags
& PCI_VGA_STATE_CHANGE_BRIDGE
))
3653 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
3656 cmd
|= PCI_BRIDGE_CTL_VGA
;
3658 cmd
&= ~PCI_BRIDGE_CTL_VGA
;
3659 pci_write_config_word(bridge
, PCI_BRIDGE_CONTROL
,
3667 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
3668 static char resource_alignment_param
[RESOURCE_ALIGNMENT_PARAM_SIZE
] = {0};
3669 static DEFINE_SPINLOCK(resource_alignment_lock
);
3672 * pci_specified_resource_alignment - get resource alignment specified by user.
3673 * @dev: the PCI device to get
3675 * RETURNS: Resource alignment if it is specified.
3676 * Zero if it is not specified.
3678 resource_size_t
pci_specified_resource_alignment(struct pci_dev
*dev
)
3680 int seg
, bus
, slot
, func
, align_order
, count
;
3681 resource_size_t align
= 0;
3684 spin_lock(&resource_alignment_lock
);
3685 p
= resource_alignment_param
;
3688 if (sscanf(p
, "%d%n", &align_order
, &count
) == 1 &&
3694 if (sscanf(p
, "%x:%x:%x.%x%n",
3695 &seg
, &bus
, &slot
, &func
, &count
) != 4) {
3697 if (sscanf(p
, "%x:%x.%x%n",
3698 &bus
, &slot
, &func
, &count
) != 3) {
3699 /* Invalid format */
3700 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: %s\n",
3706 if (seg
== pci_domain_nr(dev
->bus
) &&
3707 bus
== dev
->bus
->number
&&
3708 slot
== PCI_SLOT(dev
->devfn
) &&
3709 func
== PCI_FUNC(dev
->devfn
)) {
3710 if (align_order
== -1) {
3713 align
= 1 << align_order
;
3718 if (*p
!= ';' && *p
!= ',') {
3719 /* End of param or invalid format */
3724 spin_unlock(&resource_alignment_lock
);
3729 * pci_is_reassigndev - check if specified PCI is target device to reassign
3730 * @dev: the PCI device to check
3732 * RETURNS: non-zero for PCI device is a target device to reassign,
3735 int pci_is_reassigndev(struct pci_dev
*dev
)
3737 return (pci_specified_resource_alignment(dev
) != 0);
3741 * This function disables memory decoding and releases memory resources
3742 * of the device specified by kernel's boot parameter 'pci=resource_alignment='.
3743 * It also rounds up size to specified alignment.
3744 * Later on, the kernel will assign page-aligned memory resource back
3747 void pci_reassigndev_resource_alignment(struct pci_dev
*dev
)
3751 resource_size_t align
, size
;
3754 if (!pci_is_reassigndev(dev
))
3757 if (dev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
&&
3758 (dev
->class >> 8) == PCI_CLASS_BRIDGE_HOST
) {
3760 "Can't reassign resources to host bridge.\n");
3765 "Disabling memory decoding and releasing memory resources.\n");
3766 pci_read_config_word(dev
, PCI_COMMAND
, &command
);
3767 command
&= ~PCI_COMMAND_MEMORY
;
3768 pci_write_config_word(dev
, PCI_COMMAND
, command
);
3770 align
= pci_specified_resource_alignment(dev
);
3771 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++) {
3772 r
= &dev
->resource
[i
];
3773 if (!(r
->flags
& IORESOURCE_MEM
))
3775 size
= resource_size(r
);
3779 "Rounding up size of resource #%d to %#llx.\n",
3780 i
, (unsigned long long)size
);
3785 /* Need to disable bridge's resource window,
3786 * to enable the kernel to reassign new resource
3789 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
&&
3790 (dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
3791 for (i
= PCI_BRIDGE_RESOURCES
; i
< PCI_NUM_RESOURCES
; i
++) {
3792 r
= &dev
->resource
[i
];
3793 if (!(r
->flags
& IORESOURCE_MEM
))
3795 r
->end
= resource_size(r
) - 1;
3798 pci_disable_bridge_window(dev
);
3802 ssize_t
pci_set_resource_alignment_param(const char *buf
, size_t count
)
3804 if (count
> RESOURCE_ALIGNMENT_PARAM_SIZE
- 1)
3805 count
= RESOURCE_ALIGNMENT_PARAM_SIZE
- 1;
3806 spin_lock(&resource_alignment_lock
);
3807 strncpy(resource_alignment_param
, buf
, count
);
3808 resource_alignment_param
[count
] = '\0';
3809 spin_unlock(&resource_alignment_lock
);
3813 ssize_t
pci_get_resource_alignment_param(char *buf
, size_t size
)
3816 spin_lock(&resource_alignment_lock
);
3817 count
= snprintf(buf
, size
, "%s", resource_alignment_param
);
3818 spin_unlock(&resource_alignment_lock
);
3822 static ssize_t
pci_resource_alignment_show(struct bus_type
*bus
, char *buf
)
3824 return pci_get_resource_alignment_param(buf
, PAGE_SIZE
);
3827 static ssize_t
pci_resource_alignment_store(struct bus_type
*bus
,
3828 const char *buf
, size_t count
)
3830 return pci_set_resource_alignment_param(buf
, count
);
3833 BUS_ATTR(resource_alignment
, 0644, pci_resource_alignment_show
,
3834 pci_resource_alignment_store
);
3836 static int __init
pci_resource_alignment_sysfs_init(void)
3838 return bus_create_file(&pci_bus_type
,
3839 &bus_attr_resource_alignment
);
3842 late_initcall(pci_resource_alignment_sysfs_init
);
3844 static void __devinit
pci_no_domains(void)
3846 #ifdef CONFIG_PCI_DOMAINS
3847 pci_domains_supported
= 0;
3852 * pci_ext_cfg_enabled - can we access extended PCI config space?
3853 * @dev: The PCI device of the root bridge.
3855 * Returns 1 if we can access PCI extended config space (offsets
3856 * greater than 0xff). This is the default implementation. Architecture
3857 * implementations can override this.
3859 int __attribute__ ((weak
)) pci_ext_cfg_avail(struct pci_dev
*dev
)
3864 void __weak
pci_fixup_cardbus(struct pci_bus
*bus
)
3867 EXPORT_SYMBOL(pci_fixup_cardbus
);
3869 static int __init
pci_setup(char *str
)
3872 char *k
= strchr(str
, ',');
3875 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
3876 if (!strcmp(str
, "nomsi")) {
3878 } else if (!strcmp(str
, "noaer")) {
3880 } else if (!strncmp(str
, "realloc=", 8)) {
3881 pci_realloc_get_opt(str
+ 8);
3882 } else if (!strncmp(str
, "realloc", 7)) {
3883 pci_realloc_get_opt("on");
3884 } else if (!strcmp(str
, "nodomains")) {
3886 } else if (!strncmp(str
, "noari", 5)) {
3887 pcie_ari_disabled
= true;
3888 } else if (!strncmp(str
, "cbiosize=", 9)) {
3889 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
3890 } else if (!strncmp(str
, "cbmemsize=", 10)) {
3891 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
3892 } else if (!strncmp(str
, "resource_alignment=", 19)) {
3893 pci_set_resource_alignment_param(str
+ 19,
3895 } else if (!strncmp(str
, "ecrc=", 5)) {
3896 pcie_ecrc_get_policy(str
+ 5);
3897 } else if (!strncmp(str
, "hpiosize=", 9)) {
3898 pci_hotplug_io_size
= memparse(str
+ 9, &str
);
3899 } else if (!strncmp(str
, "hpmemsize=", 10)) {
3900 pci_hotplug_mem_size
= memparse(str
+ 10, &str
);
3901 } else if (!strncmp(str
, "pcie_bus_tune_off", 17)) {
3902 pcie_bus_config
= PCIE_BUS_TUNE_OFF
;
3903 } else if (!strncmp(str
, "pcie_bus_safe", 13)) {
3904 pcie_bus_config
= PCIE_BUS_SAFE
;
3905 } else if (!strncmp(str
, "pcie_bus_perf", 13)) {
3906 pcie_bus_config
= PCIE_BUS_PERFORMANCE
;
3907 } else if (!strncmp(str
, "pcie_bus_peer2peer", 18)) {
3908 pcie_bus_config
= PCIE_BUS_PEER2PEER
;
3909 } else if (!strncmp(str
, "pcie_scan_all", 13)) {
3910 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS
);
3912 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
3920 early_param("pci", pci_setup
);
3922 EXPORT_SYMBOL(pci_reenable_device
);
3923 EXPORT_SYMBOL(pci_enable_device_io
);
3924 EXPORT_SYMBOL(pci_enable_device_mem
);
3925 EXPORT_SYMBOL(pci_enable_device
);
3926 EXPORT_SYMBOL(pcim_enable_device
);
3927 EXPORT_SYMBOL(pcim_pin_device
);
3928 EXPORT_SYMBOL(pci_disable_device
);
3929 EXPORT_SYMBOL(pci_find_capability
);
3930 EXPORT_SYMBOL(pci_bus_find_capability
);
3931 EXPORT_SYMBOL(pci_release_regions
);
3932 EXPORT_SYMBOL(pci_request_regions
);
3933 EXPORT_SYMBOL(pci_request_regions_exclusive
);
3934 EXPORT_SYMBOL(pci_release_region
);
3935 EXPORT_SYMBOL(pci_request_region
);
3936 EXPORT_SYMBOL(pci_request_region_exclusive
);
3937 EXPORT_SYMBOL(pci_release_selected_regions
);
3938 EXPORT_SYMBOL(pci_request_selected_regions
);
3939 EXPORT_SYMBOL(pci_request_selected_regions_exclusive
);
3940 EXPORT_SYMBOL(pci_set_master
);
3941 EXPORT_SYMBOL(pci_clear_master
);
3942 EXPORT_SYMBOL(pci_set_mwi
);
3943 EXPORT_SYMBOL(pci_try_set_mwi
);
3944 EXPORT_SYMBOL(pci_clear_mwi
);
3945 EXPORT_SYMBOL_GPL(pci_intx
);
3946 EXPORT_SYMBOL(pci_assign_resource
);
3947 EXPORT_SYMBOL(pci_find_parent_resource
);
3948 EXPORT_SYMBOL(pci_select_bars
);
3950 EXPORT_SYMBOL(pci_set_power_state
);
3951 EXPORT_SYMBOL(pci_save_state
);
3952 EXPORT_SYMBOL(pci_restore_state
);
3953 EXPORT_SYMBOL(pci_pme_capable
);
3954 EXPORT_SYMBOL(pci_pme_active
);
3955 EXPORT_SYMBOL(pci_wake_from_d3
);
3956 EXPORT_SYMBOL(pci_target_state
);
3957 EXPORT_SYMBOL(pci_prepare_to_sleep
);
3958 EXPORT_SYMBOL(pci_back_from_sleep
);
3959 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state
);