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/module.h>
16 #include <linux/spinlock.h>
17 #include <linux/string.h>
18 #include <linux/log2.h>
19 #include <linux/pci-aspm.h>
20 #include <linux/pm_wakeup.h>
21 #include <linux/interrupt.h>
22 #include <linux/device.h>
23 #include <linux/pm_runtime.h>
24 #include <asm/setup.h>
27 const char *pci_power_names
[] = {
28 "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
30 EXPORT_SYMBOL_GPL(pci_power_names
);
32 int isa_dma_bridge_buggy
;
33 EXPORT_SYMBOL(isa_dma_bridge_buggy
);
36 EXPORT_SYMBOL(pci_pci_problems
);
38 unsigned int pci_pm_d3_delay
;
40 static void pci_dev_d3_sleep(struct pci_dev
*dev
)
42 unsigned int delay
= dev
->d3_delay
;
44 if (delay
< pci_pm_d3_delay
)
45 delay
= pci_pm_d3_delay
;
50 #ifdef CONFIG_PCI_DOMAINS
51 int pci_domains_supported
= 1;
54 #define DEFAULT_CARDBUS_IO_SIZE (256)
55 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
56 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
57 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
58 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
60 #define DEFAULT_HOTPLUG_IO_SIZE (256)
61 #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
62 /* pci=hpmemsize=nnM,hpiosize=nn can override this */
63 unsigned long pci_hotplug_io_size
= DEFAULT_HOTPLUG_IO_SIZE
;
64 unsigned long pci_hotplug_mem_size
= DEFAULT_HOTPLUG_MEM_SIZE
;
67 * The default CLS is used if arch didn't set CLS explicitly and not
68 * all pci devices agree on the same value. Arch can override either
69 * the dfl or actual value as it sees fit. Don't forget this is
70 * measured in 32-bit words, not bytes.
72 u8 pci_dfl_cache_line_size __devinitdata
= L1_CACHE_BYTES
>> 2;
73 u8 pci_cache_line_size
;
76 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
77 * @bus: pointer to PCI bus structure to search
79 * Given a PCI bus, returns the highest PCI bus number present in the set
80 * including the given PCI bus and its list of child PCI buses.
82 unsigned char pci_bus_max_busnr(struct pci_bus
* bus
)
84 struct list_head
*tmp
;
87 max
= bus
->subordinate
;
88 list_for_each(tmp
, &bus
->children
) {
89 n
= pci_bus_max_busnr(pci_bus_b(tmp
));
95 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
97 #ifdef CONFIG_HAS_IOMEM
98 void __iomem
*pci_ioremap_bar(struct pci_dev
*pdev
, int bar
)
101 * Make sure the BAR is actually a memory resource, not an IO resource
103 if (!(pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)) {
107 return ioremap_nocache(pci_resource_start(pdev
, bar
),
108 pci_resource_len(pdev
, bar
));
110 EXPORT_SYMBOL_GPL(pci_ioremap_bar
);
115 * pci_max_busnr - returns maximum PCI bus number
117 * Returns the highest PCI bus number present in the system global list of
120 unsigned char __devinit
123 struct pci_bus
*bus
= NULL
;
124 unsigned char max
, n
;
127 while ((bus
= pci_find_next_bus(bus
)) != NULL
) {
128 n
= pci_bus_max_busnr(bus
);
137 #define PCI_FIND_CAP_TTL 48
139 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
140 u8 pos
, int cap
, int *ttl
)
145 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
149 pci_bus_read_config_byte(bus
, devfn
, pos
+ PCI_CAP_LIST_ID
,
155 pos
+= PCI_CAP_LIST_NEXT
;
160 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
163 int ttl
= PCI_FIND_CAP_TTL
;
165 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
168 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
170 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
171 pos
+ PCI_CAP_LIST_NEXT
, cap
);
173 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
175 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
176 unsigned int devfn
, u8 hdr_type
)
180 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
181 if (!(status
& PCI_STATUS_CAP_LIST
))
185 case PCI_HEADER_TYPE_NORMAL
:
186 case PCI_HEADER_TYPE_BRIDGE
:
187 return PCI_CAPABILITY_LIST
;
188 case PCI_HEADER_TYPE_CARDBUS
:
189 return PCI_CB_CAPABILITY_LIST
;
198 * pci_find_capability - query for devices' capabilities
199 * @dev: PCI device to query
200 * @cap: capability code
202 * Tell if a device supports a given PCI capability.
203 * Returns the address of the requested capability structure within the
204 * device's PCI configuration space or 0 in case the device does not
205 * support it. Possible values for @cap:
207 * %PCI_CAP_ID_PM Power Management
208 * %PCI_CAP_ID_AGP Accelerated Graphics Port
209 * %PCI_CAP_ID_VPD Vital Product Data
210 * %PCI_CAP_ID_SLOTID Slot Identification
211 * %PCI_CAP_ID_MSI Message Signalled Interrupts
212 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
213 * %PCI_CAP_ID_PCIX PCI-X
214 * %PCI_CAP_ID_EXP PCI Express
216 int pci_find_capability(struct pci_dev
*dev
, int cap
)
220 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
222 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
228 * pci_bus_find_capability - query for devices' capabilities
229 * @bus: the PCI bus to query
230 * @devfn: PCI device to query
231 * @cap: capability code
233 * Like pci_find_capability() but works for pci devices that do not have a
234 * pci_dev structure set up yet.
236 * Returns the address of the requested capability structure within the
237 * device's PCI configuration space or 0 in case the device does not
240 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
245 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
247 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
249 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
255 * pci_find_ext_capability - Find an extended capability
256 * @dev: PCI device to query
257 * @cap: capability code
259 * Returns the address of the requested extended capability structure
260 * within the device's PCI configuration space or 0 if the device does
261 * not support it. Possible values for @cap:
263 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
264 * %PCI_EXT_CAP_ID_VC Virtual Channel
265 * %PCI_EXT_CAP_ID_DSN Device Serial Number
266 * %PCI_EXT_CAP_ID_PWR Power Budgeting
268 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
272 int pos
= PCI_CFG_SPACE_SIZE
;
274 /* minimum 8 bytes per capability */
275 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
277 if (dev
->cfg_size
<= PCI_CFG_SPACE_SIZE
)
280 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
284 * If we have no capabilities, this is indicated by cap ID,
285 * cap version and next pointer all being 0.
291 if (PCI_EXT_CAP_ID(header
) == cap
)
294 pos
= PCI_EXT_CAP_NEXT(header
);
295 if (pos
< PCI_CFG_SPACE_SIZE
)
298 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
304 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
306 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
308 int rc
, ttl
= PCI_FIND_CAP_TTL
;
311 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
312 mask
= HT_3BIT_CAP_MASK
;
314 mask
= HT_5BIT_CAP_MASK
;
316 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
317 PCI_CAP_ID_HT
, &ttl
);
319 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
320 if (rc
!= PCIBIOS_SUCCESSFUL
)
323 if ((cap
& mask
) == ht_cap
)
326 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
327 pos
+ PCI_CAP_LIST_NEXT
,
328 PCI_CAP_ID_HT
, &ttl
);
334 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
335 * @dev: PCI device to query
336 * @pos: Position from which to continue searching
337 * @ht_cap: Hypertransport capability code
339 * To be used in conjunction with pci_find_ht_capability() to search for
340 * all capabilities matching @ht_cap. @pos should always be a value returned
341 * from pci_find_ht_capability().
343 * NB. To be 100% safe against broken PCI devices, the caller should take
344 * steps to avoid an infinite loop.
346 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
348 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
350 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
353 * pci_find_ht_capability - query a device's Hypertransport capabilities
354 * @dev: PCI device to query
355 * @ht_cap: Hypertransport capability code
357 * Tell if a device supports a given Hypertransport capability.
358 * Returns an address within the device's PCI configuration space
359 * or 0 in case the device does not support the request capability.
360 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
361 * which has a Hypertransport capability matching @ht_cap.
363 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
367 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
369 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
373 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
376 * pci_find_parent_resource - return resource region of parent bus of given region
377 * @dev: PCI device structure contains resources to be searched
378 * @res: child resource record for which parent is sought
380 * For given resource region of given device, return the resource
381 * region of parent bus the given region is contained in or where
382 * it should be allocated from.
385 pci_find_parent_resource(const struct pci_dev
*dev
, struct resource
*res
)
387 const struct pci_bus
*bus
= dev
->bus
;
389 struct resource
*best
= NULL
, *r
;
391 pci_bus_for_each_resource(bus
, r
, i
) {
394 if (res
->start
&& !(res
->start
>= r
->start
&& res
->end
<= r
->end
))
395 continue; /* Not contained */
396 if ((res
->flags
^ r
->flags
) & (IORESOURCE_IO
| IORESOURCE_MEM
))
397 continue; /* Wrong type */
398 if (!((res
->flags
^ r
->flags
) & IORESOURCE_PREFETCH
))
399 return r
; /* Exact match */
400 /* We can't insert a non-prefetch resource inside a prefetchable parent .. */
401 if (r
->flags
& IORESOURCE_PREFETCH
)
403 /* .. but we can put a prefetchable resource inside a non-prefetchable one */
411 * pci_restore_bars - restore a devices BAR values (e.g. after wake-up)
412 * @dev: PCI device to have its BARs restored
414 * Restore the BAR values for a given device, so as to make it
415 * accessible by its driver.
418 pci_restore_bars(struct pci_dev
*dev
)
422 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++)
423 pci_update_resource(dev
, i
);
426 static struct pci_platform_pm_ops
*pci_platform_pm
;
428 int pci_set_platform_pm(struct pci_platform_pm_ops
*ops
)
430 if (!ops
->is_manageable
|| !ops
->set_state
|| !ops
->choose_state
431 || !ops
->sleep_wake
|| !ops
->can_wakeup
)
433 pci_platform_pm
= ops
;
437 static inline bool platform_pci_power_manageable(struct pci_dev
*dev
)
439 return pci_platform_pm
? pci_platform_pm
->is_manageable(dev
) : false;
442 static inline int platform_pci_set_power_state(struct pci_dev
*dev
,
445 return pci_platform_pm
? pci_platform_pm
->set_state(dev
, t
) : -ENOSYS
;
448 static inline pci_power_t
platform_pci_choose_state(struct pci_dev
*dev
)
450 return pci_platform_pm
?
451 pci_platform_pm
->choose_state(dev
) : PCI_POWER_ERROR
;
454 static inline bool platform_pci_can_wakeup(struct pci_dev
*dev
)
456 return pci_platform_pm
? pci_platform_pm
->can_wakeup(dev
) : false;
459 static inline int platform_pci_sleep_wake(struct pci_dev
*dev
, bool enable
)
461 return pci_platform_pm
?
462 pci_platform_pm
->sleep_wake(dev
, enable
) : -ENODEV
;
465 static inline int platform_pci_run_wake(struct pci_dev
*dev
, bool enable
)
467 return pci_platform_pm
?
468 pci_platform_pm
->run_wake(dev
, enable
) : -ENODEV
;
472 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
474 * @dev: PCI device to handle.
475 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
478 * -EINVAL if the requested state is invalid.
479 * -EIO if device does not support PCI PM or its PM capabilities register has a
480 * wrong version, or device doesn't support the requested state.
481 * 0 if device already is in the requested state.
482 * 0 if device's power state has been successfully changed.
484 static int pci_raw_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
487 bool need_restore
= false;
489 /* Check if we're already there */
490 if (dev
->current_state
== state
)
496 if (state
< PCI_D0
|| state
> PCI_D3hot
)
499 /* Validate current state:
500 * Can enter D0 from any state, but if we can only go deeper
501 * to sleep if we're already in a low power state
503 if (state
!= PCI_D0
&& dev
->current_state
<= PCI_D3cold
504 && dev
->current_state
> state
) {
505 dev_err(&dev
->dev
, "invalid power transition "
506 "(from state %d to %d)\n", dev
->current_state
, state
);
510 /* check if this device supports the desired state */
511 if ((state
== PCI_D1
&& !dev
->d1_support
)
512 || (state
== PCI_D2
&& !dev
->d2_support
))
515 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
517 /* If we're (effectively) in D3, force entire word to 0.
518 * This doesn't affect PME_Status, disables PME_En, and
519 * sets PowerState to 0.
521 switch (dev
->current_state
) {
525 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
530 case PCI_UNKNOWN
: /* Boot-up */
531 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
532 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
534 /* Fall-through: force to D0 */
540 /* enter specified state */
541 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
543 /* Mandatory power management transition delays */
544 /* see PCI PM 1.1 5.6.1 table 18 */
545 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
546 pci_dev_d3_sleep(dev
);
547 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
548 udelay(PCI_PM_D2_DELAY
);
550 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
551 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
552 if (dev
->current_state
!= state
&& printk_ratelimit())
553 dev_info(&dev
->dev
, "Refused to change power state, "
554 "currently in D%d\n", dev
->current_state
);
556 /* According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
557 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
558 * from D3hot to D0 _may_ perform an internal reset, thereby
559 * going to "D0 Uninitialized" rather than "D0 Initialized".
560 * For example, at least some versions of the 3c905B and the
561 * 3c556B exhibit this behaviour.
563 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
564 * devices in a D3hot state at boot. Consequently, we need to
565 * restore at least the BARs so that the device will be
566 * accessible to its driver.
569 pci_restore_bars(dev
);
572 pcie_aspm_pm_state_change(dev
->bus
->self
);
578 * pci_update_current_state - Read PCI power state of given device from its
579 * PCI PM registers and cache it
580 * @dev: PCI device to handle.
581 * @state: State to cache in case the device doesn't have the PM capability
583 void pci_update_current_state(struct pci_dev
*dev
, pci_power_t state
)
588 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
589 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
591 dev
->current_state
= state
;
596 * pci_platform_power_transition - Use platform to change device power state
597 * @dev: PCI device to handle.
598 * @state: State to put the device into.
600 static int pci_platform_power_transition(struct pci_dev
*dev
, pci_power_t state
)
604 if (platform_pci_power_manageable(dev
)) {
605 error
= platform_pci_set_power_state(dev
, state
);
607 pci_update_current_state(dev
, state
);
610 /* Fall back to PCI_D0 if native PM is not supported */
612 dev
->current_state
= PCI_D0
;
619 * __pci_start_power_transition - Start power transition of a PCI device
620 * @dev: PCI device to handle.
621 * @state: State to put the device into.
623 static void __pci_start_power_transition(struct pci_dev
*dev
, pci_power_t state
)
626 pci_platform_power_transition(dev
, PCI_D0
);
630 * __pci_complete_power_transition - Complete power transition of a PCI device
631 * @dev: PCI device to handle.
632 * @state: State to put the device into.
634 * This function should not be called directly by device drivers.
636 int __pci_complete_power_transition(struct pci_dev
*dev
, pci_power_t state
)
638 return state
> PCI_D0
?
639 pci_platform_power_transition(dev
, state
) : -EINVAL
;
641 EXPORT_SYMBOL_GPL(__pci_complete_power_transition
);
644 * pci_set_power_state - Set the power state of a PCI device
645 * @dev: PCI device to handle.
646 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
648 * Transition a device to a new power state, using the platform firmware and/or
649 * the device's PCI PM registers.
652 * -EINVAL if the requested state is invalid.
653 * -EIO if device does not support PCI PM or its PM capabilities register has a
654 * wrong version, or device doesn't support the requested state.
655 * 0 if device already is in the requested state.
656 * 0 if device's power state has been successfully changed.
658 int pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
662 /* bound the state we're entering */
663 if (state
> PCI_D3hot
)
665 else if (state
< PCI_D0
)
667 else if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
669 * If the device or the parent bridge do not support PCI PM,
670 * ignore the request if we're doing anything other than putting
671 * it into D0 (which would only happen on boot).
675 /* Check if we're already there */
676 if (dev
->current_state
== state
)
679 __pci_start_power_transition(dev
, state
);
681 /* This device is quirked not to be put into D3, so
682 don't put it in D3 */
683 if (state
== PCI_D3hot
&& (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3
))
686 error
= pci_raw_set_power_state(dev
, state
);
688 if (!__pci_complete_power_transition(dev
, state
))
695 * pci_choose_state - Choose the power state of a PCI device
696 * @dev: PCI device to be suspended
697 * @state: target sleep state for the whole system. This is the value
698 * that is passed to suspend() function.
700 * Returns PCI power state suitable for given device and given system
704 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
708 if (!pci_find_capability(dev
, PCI_CAP_ID_PM
))
711 ret
= platform_pci_choose_state(dev
);
712 if (ret
!= PCI_POWER_ERROR
)
715 switch (state
.event
) {
718 case PM_EVENT_FREEZE
:
719 case PM_EVENT_PRETHAW
:
720 /* REVISIT both freeze and pre-thaw "should" use D0 */
721 case PM_EVENT_SUSPEND
:
722 case PM_EVENT_HIBERNATE
:
725 dev_info(&dev
->dev
, "unrecognized suspend event %d\n",
732 EXPORT_SYMBOL(pci_choose_state
);
734 #define PCI_EXP_SAVE_REGS 7
736 #define pcie_cap_has_devctl(type, flags) 1
737 #define pcie_cap_has_lnkctl(type, flags) \
738 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
739 (type == PCI_EXP_TYPE_ROOT_PORT || \
740 type == PCI_EXP_TYPE_ENDPOINT || \
741 type == PCI_EXP_TYPE_LEG_END))
742 #define pcie_cap_has_sltctl(type, flags) \
743 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
744 ((type == PCI_EXP_TYPE_ROOT_PORT) || \
745 (type == PCI_EXP_TYPE_DOWNSTREAM && \
746 (flags & PCI_EXP_FLAGS_SLOT))))
747 #define pcie_cap_has_rtctl(type, flags) \
748 ((flags & PCI_EXP_FLAGS_VERS) > 1 || \
749 (type == PCI_EXP_TYPE_ROOT_PORT || \
750 type == PCI_EXP_TYPE_RC_EC))
751 #define pcie_cap_has_devctl2(type, flags) \
752 ((flags & PCI_EXP_FLAGS_VERS) > 1)
753 #define pcie_cap_has_lnkctl2(type, flags) \
754 ((flags & PCI_EXP_FLAGS_VERS) > 1)
755 #define pcie_cap_has_sltctl2(type, flags) \
756 ((flags & PCI_EXP_FLAGS_VERS) > 1)
758 static int pci_save_pcie_state(struct pci_dev
*dev
)
761 struct pci_cap_saved_state
*save_state
;
765 pos
= pci_pcie_cap(dev
);
769 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
771 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
774 cap
= (u16
*)&save_state
->data
[0];
776 pci_read_config_word(dev
, pos
+ PCI_EXP_FLAGS
, &flags
);
778 if (pcie_cap_has_devctl(dev
->pcie_type
, flags
))
779 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &cap
[i
++]);
780 if (pcie_cap_has_lnkctl(dev
->pcie_type
, flags
))
781 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, &cap
[i
++]);
782 if (pcie_cap_has_sltctl(dev
->pcie_type
, flags
))
783 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, &cap
[i
++]);
784 if (pcie_cap_has_rtctl(dev
->pcie_type
, flags
))
785 pci_read_config_word(dev
, pos
+ PCI_EXP_RTCTL
, &cap
[i
++]);
786 if (pcie_cap_has_devctl2(dev
->pcie_type
, flags
))
787 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, &cap
[i
++]);
788 if (pcie_cap_has_lnkctl2(dev
->pcie_type
, flags
))
789 pci_read_config_word(dev
, pos
+ PCI_EXP_LNKCTL2
, &cap
[i
++]);
790 if (pcie_cap_has_sltctl2(dev
->pcie_type
, flags
))
791 pci_read_config_word(dev
, pos
+ PCI_EXP_SLTCTL2
, &cap
[i
++]);
796 static void pci_restore_pcie_state(struct pci_dev
*dev
)
799 struct pci_cap_saved_state
*save_state
;
803 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
804 pos
= pci_find_capability(dev
, PCI_CAP_ID_EXP
);
805 if (!save_state
|| pos
<= 0)
807 cap
= (u16
*)&save_state
->data
[0];
809 pci_read_config_word(dev
, pos
+ PCI_EXP_FLAGS
, &flags
);
811 if (pcie_cap_has_devctl(dev
->pcie_type
, flags
))
812 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, cap
[i
++]);
813 if (pcie_cap_has_lnkctl(dev
->pcie_type
, flags
))
814 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL
, cap
[i
++]);
815 if (pcie_cap_has_sltctl(dev
->pcie_type
, flags
))
816 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL
, cap
[i
++]);
817 if (pcie_cap_has_rtctl(dev
->pcie_type
, flags
))
818 pci_write_config_word(dev
, pos
+ PCI_EXP_RTCTL
, cap
[i
++]);
819 if (pcie_cap_has_devctl2(dev
->pcie_type
, flags
))
820 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL2
, cap
[i
++]);
821 if (pcie_cap_has_lnkctl2(dev
->pcie_type
, flags
))
822 pci_write_config_word(dev
, pos
+ PCI_EXP_LNKCTL2
, cap
[i
++]);
823 if (pcie_cap_has_sltctl2(dev
->pcie_type
, flags
))
824 pci_write_config_word(dev
, pos
+ PCI_EXP_SLTCTL2
, cap
[i
++]);
828 static int pci_save_pcix_state(struct pci_dev
*dev
)
831 struct pci_cap_saved_state
*save_state
;
833 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
837 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
839 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
843 pci_read_config_word(dev
, pos
+ PCI_X_CMD
, (u16
*)save_state
->data
);
848 static void pci_restore_pcix_state(struct pci_dev
*dev
)
851 struct pci_cap_saved_state
*save_state
;
854 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
855 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
856 if (!save_state
|| pos
<= 0)
858 cap
= (u16
*)&save_state
->data
[0];
860 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
865 * pci_save_state - save the PCI configuration space of a device before suspending
866 * @dev: - PCI device that we're dealing with
869 pci_save_state(struct pci_dev
*dev
)
872 /* XXX: 100% dword access ok here? */
873 for (i
= 0; i
< 16; i
++)
874 pci_read_config_dword(dev
, i
* 4, &dev
->saved_config_space
[i
]);
875 dev
->state_saved
= true;
876 if ((i
= pci_save_pcie_state(dev
)) != 0)
878 if ((i
= pci_save_pcix_state(dev
)) != 0)
884 * pci_restore_state - Restore the saved state of a PCI device
885 * @dev: - PCI device that we're dealing with
888 pci_restore_state(struct pci_dev
*dev
)
893 if (!dev
->state_saved
)
896 /* PCI Express register must be restored first */
897 pci_restore_pcie_state(dev
);
900 * The Base Address register should be programmed before the command
903 for (i
= 15; i
>= 0; i
--) {
904 pci_read_config_dword(dev
, i
* 4, &val
);
905 if (val
!= dev
->saved_config_space
[i
]) {
906 dev_printk(KERN_DEBUG
, &dev
->dev
, "restoring config "
907 "space at offset %#x (was %#x, writing %#x)\n",
908 i
, val
, (int)dev
->saved_config_space
[i
]);
909 pci_write_config_dword(dev
,i
* 4,
910 dev
->saved_config_space
[i
]);
913 pci_restore_pcix_state(dev
);
914 pci_restore_msi_state(dev
);
915 pci_restore_iov_state(dev
);
917 dev
->state_saved
= false;
922 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
926 err
= pci_set_power_state(dev
, PCI_D0
);
927 if (err
< 0 && err
!= -EIO
)
929 err
= pcibios_enable_device(dev
, bars
);
932 pci_fixup_device(pci_fixup_enable
, dev
);
938 * pci_reenable_device - Resume abandoned device
939 * @dev: PCI device to be resumed
941 * Note this function is a backend of pci_default_resume and is not supposed
942 * to be called by normal code, write proper resume handler and use it instead.
944 int pci_reenable_device(struct pci_dev
*dev
)
946 if (pci_is_enabled(dev
))
947 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
951 static int __pci_enable_device_flags(struct pci_dev
*dev
,
952 resource_size_t flags
)
957 if (atomic_add_return(1, &dev
->enable_cnt
) > 1)
958 return 0; /* already enabled */
960 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
961 if (dev
->resource
[i
].flags
& flags
)
964 err
= do_pci_enable_device(dev
, bars
);
966 atomic_dec(&dev
->enable_cnt
);
971 * pci_enable_device_io - Initialize a device for use with IO space
972 * @dev: PCI device to be initialized
974 * Initialize device before it's used by a driver. Ask low-level code
975 * to enable I/O resources. Wake up the device if it was suspended.
976 * Beware, this function can fail.
978 int pci_enable_device_io(struct pci_dev
*dev
)
980 return __pci_enable_device_flags(dev
, IORESOURCE_IO
);
984 * pci_enable_device_mem - Initialize a device for use with Memory space
985 * @dev: PCI device to be initialized
987 * Initialize device before it's used by a driver. Ask low-level code
988 * to enable Memory resources. Wake up the device if it was suspended.
989 * Beware, this function can fail.
991 int pci_enable_device_mem(struct pci_dev
*dev
)
993 return __pci_enable_device_flags(dev
, IORESOURCE_MEM
);
997 * pci_enable_device - Initialize device before it's used by a driver.
998 * @dev: PCI device to be initialized
1000 * Initialize device before it's used by a driver. Ask low-level code
1001 * to enable I/O and memory. Wake up the device if it was suspended.
1002 * Beware, this function can fail.
1004 * Note we don't actually enable the device many times if we call
1005 * this function repeatedly (we just increment the count).
1007 int pci_enable_device(struct pci_dev
*dev
)
1009 return __pci_enable_device_flags(dev
, IORESOURCE_MEM
| IORESOURCE_IO
);
1013 * Managed PCI resources. This manages device on/off, intx/msi/msix
1014 * on/off and BAR regions. pci_dev itself records msi/msix status, so
1015 * there's no need to track it separately. pci_devres is initialized
1016 * when a device is enabled using managed PCI device enable interface.
1019 unsigned int enabled
:1;
1020 unsigned int pinned
:1;
1021 unsigned int orig_intx
:1;
1022 unsigned int restore_intx
:1;
1026 static void pcim_release(struct device
*gendev
, void *res
)
1028 struct pci_dev
*dev
= container_of(gendev
, struct pci_dev
, dev
);
1029 struct pci_devres
*this = res
;
1032 if (dev
->msi_enabled
)
1033 pci_disable_msi(dev
);
1034 if (dev
->msix_enabled
)
1035 pci_disable_msix(dev
);
1037 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
1038 if (this->region_mask
& (1 << i
))
1039 pci_release_region(dev
, i
);
1041 if (this->restore_intx
)
1042 pci_intx(dev
, this->orig_intx
);
1044 if (this->enabled
&& !this->pinned
)
1045 pci_disable_device(dev
);
1048 static struct pci_devres
* get_pci_dr(struct pci_dev
*pdev
)
1050 struct pci_devres
*dr
, *new_dr
;
1052 dr
= devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1056 new_dr
= devres_alloc(pcim_release
, sizeof(*new_dr
), GFP_KERNEL
);
1059 return devres_get(&pdev
->dev
, new_dr
, NULL
, NULL
);
1062 static struct pci_devres
* find_pci_dr(struct pci_dev
*pdev
)
1064 if (pci_is_managed(pdev
))
1065 return devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1070 * pcim_enable_device - Managed pci_enable_device()
1071 * @pdev: PCI device to be initialized
1073 * Managed pci_enable_device().
1075 int pcim_enable_device(struct pci_dev
*pdev
)
1077 struct pci_devres
*dr
;
1080 dr
= get_pci_dr(pdev
);
1086 rc
= pci_enable_device(pdev
);
1088 pdev
->is_managed
= 1;
1095 * pcim_pin_device - Pin managed PCI device
1096 * @pdev: PCI device to pin
1098 * Pin managed PCI device @pdev. Pinned device won't be disabled on
1099 * driver detach. @pdev must have been enabled with
1100 * pcim_enable_device().
1102 void pcim_pin_device(struct pci_dev
*pdev
)
1104 struct pci_devres
*dr
;
1106 dr
= find_pci_dr(pdev
);
1107 WARN_ON(!dr
|| !dr
->enabled
);
1113 * pcibios_disable_device - disable arch specific PCI resources for device dev
1114 * @dev: the PCI device to disable
1116 * Disables architecture specific PCI resources for the device. This
1117 * is the default implementation. Architecture implementations can
1120 void __attribute__ ((weak
)) pcibios_disable_device (struct pci_dev
*dev
) {}
1122 static void do_pci_disable_device(struct pci_dev
*dev
)
1126 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
1127 if (pci_command
& PCI_COMMAND_MASTER
) {
1128 pci_command
&= ~PCI_COMMAND_MASTER
;
1129 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
1132 pcibios_disable_device(dev
);
1136 * pci_disable_enabled_device - Disable device without updating enable_cnt
1137 * @dev: PCI device to disable
1139 * NOTE: This function is a backend of PCI power management routines and is
1140 * not supposed to be called drivers.
1142 void pci_disable_enabled_device(struct pci_dev
*dev
)
1144 if (pci_is_enabled(dev
))
1145 do_pci_disable_device(dev
);
1149 * pci_disable_device - Disable PCI device after use
1150 * @dev: PCI device to be disabled
1152 * Signal to the system that the PCI device is not in use by the system
1153 * anymore. This only involves disabling PCI bus-mastering, if active.
1155 * Note we don't actually disable the device until all callers of
1156 * pci_device_enable() have called pci_device_disable().
1159 pci_disable_device(struct pci_dev
*dev
)
1161 struct pci_devres
*dr
;
1163 dr
= find_pci_dr(dev
);
1167 if (atomic_sub_return(1, &dev
->enable_cnt
) != 0)
1170 do_pci_disable_device(dev
);
1172 dev
->is_busmaster
= 0;
1176 * pcibios_set_pcie_reset_state - set reset state for device dev
1177 * @dev: the PCIe device reset
1178 * @state: Reset state to enter into
1181 * Sets the PCIe reset state for the device. This is the default
1182 * implementation. Architecture implementations can override this.
1184 int __attribute__ ((weak
)) pcibios_set_pcie_reset_state(struct pci_dev
*dev
,
1185 enum pcie_reset_state state
)
1191 * pci_set_pcie_reset_state - set reset state for device dev
1192 * @dev: the PCIe device reset
1193 * @state: Reset state to enter into
1196 * Sets the PCI reset state for the device.
1198 int pci_set_pcie_reset_state(struct pci_dev
*dev
, enum pcie_reset_state state
)
1200 return pcibios_set_pcie_reset_state(dev
, state
);
1204 * pci_check_pme_status - Check if given device has generated PME.
1205 * @dev: Device to check.
1207 * Check the PME status of the device and if set, clear it and clear PME enable
1208 * (if set). Return 'true' if PME status and PME enable were both set or
1209 * 'false' otherwise.
1211 bool pci_check_pme_status(struct pci_dev
*dev
)
1220 pmcsr_pos
= dev
->pm_cap
+ PCI_PM_CTRL
;
1221 pci_read_config_word(dev
, pmcsr_pos
, &pmcsr
);
1222 if (!(pmcsr
& PCI_PM_CTRL_PME_STATUS
))
1225 /* Clear PME status. */
1226 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1227 if (pmcsr
& PCI_PM_CTRL_PME_ENABLE
) {
1228 /* Disable PME to avoid interrupt flood. */
1229 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1233 pci_write_config_word(dev
, pmcsr_pos
, pmcsr
);
1239 * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
1240 * @dev: Device to handle.
1243 * Check if @dev has generated PME and queue a resume request for it in that
1246 static int pci_pme_wakeup(struct pci_dev
*dev
, void *ign
)
1248 if (pci_check_pme_status(dev
))
1249 pm_request_resume(&dev
->dev
);
1254 * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
1255 * @bus: Top bus of the subtree to walk.
1257 void pci_pme_wakeup_bus(struct pci_bus
*bus
)
1260 pci_walk_bus(bus
, pci_pme_wakeup
, NULL
);
1264 * pci_pme_capable - check the capability of PCI device to generate PME#
1265 * @dev: PCI device to handle.
1266 * @state: PCI state from which device will issue PME#.
1268 bool pci_pme_capable(struct pci_dev
*dev
, pci_power_t state
)
1273 return !!(dev
->pme_support
& (1 << state
));
1277 * pci_pme_active - enable or disable PCI device's PME# function
1278 * @dev: PCI device to handle.
1279 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1281 * The caller must verify that the device is capable of generating PME# before
1282 * calling this function with @enable equal to 'true'.
1284 void pci_pme_active(struct pci_dev
*dev
, bool enable
)
1291 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1292 /* Clear PME_Status by writing 1 to it and enable PME# */
1293 pmcsr
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
1295 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1297 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1299 dev_printk(KERN_DEBUG
, &dev
->dev
, "PME# %s\n",
1300 enable
? "enabled" : "disabled");
1304 * __pci_enable_wake - enable PCI device as wakeup event source
1305 * @dev: PCI device affected
1306 * @state: PCI state from which device will issue wakeup events
1307 * @runtime: True if the events are to be generated at run time
1308 * @enable: True to enable event generation; false to disable
1310 * This enables the device as a wakeup event source, or disables it.
1311 * When such events involves platform-specific hooks, those hooks are
1312 * called automatically by this routine.
1314 * Devices with legacy power management (no standard PCI PM capabilities)
1315 * always require such platform hooks.
1318 * 0 is returned on success
1319 * -EINVAL is returned if device is not supposed to wake up the system
1320 * Error code depending on the platform is returned if both the platform and
1321 * the native mechanism fail to enable the generation of wake-up events
1323 int __pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
,
1324 bool runtime
, bool enable
)
1328 if (enable
&& !runtime
&& !device_may_wakeup(&dev
->dev
))
1331 /* Don't do the same thing twice in a row for one device. */
1332 if (!!enable
== !!dev
->wakeup_prepared
)
1336 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1337 * Anderson we should be doing PME# wake enable followed by ACPI wake
1338 * enable. To disable wake-up we call the platform first, for symmetry.
1344 if (pci_pme_capable(dev
, state
))
1345 pci_pme_active(dev
, true);
1348 error
= runtime
? platform_pci_run_wake(dev
, true) :
1349 platform_pci_sleep_wake(dev
, true);
1353 dev
->wakeup_prepared
= true;
1356 platform_pci_run_wake(dev
, false);
1358 platform_pci_sleep_wake(dev
, false);
1359 pci_pme_active(dev
, false);
1360 dev
->wakeup_prepared
= false;
1365 EXPORT_SYMBOL(__pci_enable_wake
);
1368 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1369 * @dev: PCI device to prepare
1370 * @enable: True to enable wake-up event generation; false to disable
1372 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1373 * and this function allows them to set that up cleanly - pci_enable_wake()
1374 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1375 * ordering constraints.
1377 * This function only returns error code if the device is not capable of
1378 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1379 * enable wake-up power for it.
1381 int pci_wake_from_d3(struct pci_dev
*dev
, bool enable
)
1383 return pci_pme_capable(dev
, PCI_D3cold
) ?
1384 pci_enable_wake(dev
, PCI_D3cold
, enable
) :
1385 pci_enable_wake(dev
, PCI_D3hot
, enable
);
1389 * pci_target_state - find an appropriate low power state for a given PCI dev
1392 * Use underlying platform code to find a supported low power state for @dev.
1393 * If the platform can't manage @dev, return the deepest state from which it
1394 * can generate wake events, based on any available PME info.
1396 pci_power_t
pci_target_state(struct pci_dev
*dev
)
1398 pci_power_t target_state
= PCI_D3hot
;
1400 if (platform_pci_power_manageable(dev
)) {
1402 * Call the platform to choose the target state of the device
1403 * and enable wake-up from this state if supported.
1405 pci_power_t state
= platform_pci_choose_state(dev
);
1408 case PCI_POWER_ERROR
:
1413 if (pci_no_d1d2(dev
))
1416 target_state
= state
;
1418 } else if (!dev
->pm_cap
) {
1419 target_state
= PCI_D0
;
1420 } else if (device_may_wakeup(&dev
->dev
)) {
1422 * Find the deepest state from which the device can generate
1423 * wake-up events, make it the target state and enable device
1426 if (dev
->pme_support
) {
1428 && !(dev
->pme_support
& (1 << target_state
)))
1433 return target_state
;
1437 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
1438 * @dev: Device to handle.
1440 * Choose the power state appropriate for the device depending on whether
1441 * it can wake up the system and/or is power manageable by the platform
1442 * (PCI_D3hot is the default) and put the device into that state.
1444 int pci_prepare_to_sleep(struct pci_dev
*dev
)
1446 pci_power_t target_state
= pci_target_state(dev
);
1449 if (target_state
== PCI_POWER_ERROR
)
1452 pci_enable_wake(dev
, target_state
, device_may_wakeup(&dev
->dev
));
1454 error
= pci_set_power_state(dev
, target_state
);
1457 pci_enable_wake(dev
, target_state
, false);
1463 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
1464 * @dev: Device to handle.
1466 * Disable device's sytem wake-up capability and put it into D0.
1468 int pci_back_from_sleep(struct pci_dev
*dev
)
1470 pci_enable_wake(dev
, PCI_D0
, false);
1471 return pci_set_power_state(dev
, PCI_D0
);
1475 * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
1476 * @dev: PCI device being suspended.
1478 * Prepare @dev to generate wake-up events at run time and put it into a low
1481 int pci_finish_runtime_suspend(struct pci_dev
*dev
)
1483 pci_power_t target_state
= pci_target_state(dev
);
1486 if (target_state
== PCI_POWER_ERROR
)
1489 __pci_enable_wake(dev
, target_state
, true, pci_dev_run_wake(dev
));
1491 error
= pci_set_power_state(dev
, target_state
);
1494 __pci_enable_wake(dev
, target_state
, true, false);
1500 * pci_dev_run_wake - Check if device can generate run-time wake-up events.
1501 * @dev: Device to check.
1503 * Return true if the device itself is cabable of generating wake-up events
1504 * (through the platform or using the native PCIe PME) or if the device supports
1505 * PME and one of its upstream bridges can generate wake-up events.
1507 bool pci_dev_run_wake(struct pci_dev
*dev
)
1509 struct pci_bus
*bus
= dev
->bus
;
1511 if (device_run_wake(&dev
->dev
))
1514 if (!dev
->pme_support
)
1517 while (bus
->parent
) {
1518 struct pci_dev
*bridge
= bus
->self
;
1520 if (device_run_wake(&bridge
->dev
))
1526 /* We have reached the root bus. */
1528 return device_run_wake(bus
->bridge
);
1532 EXPORT_SYMBOL_GPL(pci_dev_run_wake
);
1535 * pci_pm_init - Initialize PM functions of given PCI device
1536 * @dev: PCI device to handle.
1538 void pci_pm_init(struct pci_dev
*dev
)
1543 dev
->wakeup_prepared
= false;
1546 /* find PCI PM capability in list */
1547 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
1550 /* Check device's ability to generate PME# */
1551 pci_read_config_word(dev
, pm
+ PCI_PM_PMC
, &pmc
);
1553 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
1554 dev_err(&dev
->dev
, "unsupported PM cap regs version (%u)\n",
1555 pmc
& PCI_PM_CAP_VER_MASK
);
1560 dev
->d3_delay
= PCI_PM_D3_WAIT
;
1562 dev
->d1_support
= false;
1563 dev
->d2_support
= false;
1564 if (!pci_no_d1d2(dev
)) {
1565 if (pmc
& PCI_PM_CAP_D1
)
1566 dev
->d1_support
= true;
1567 if (pmc
& PCI_PM_CAP_D2
)
1568 dev
->d2_support
= true;
1570 if (dev
->d1_support
|| dev
->d2_support
)
1571 dev_printk(KERN_DEBUG
, &dev
->dev
, "supports%s%s\n",
1572 dev
->d1_support
? " D1" : "",
1573 dev
->d2_support
? " D2" : "");
1576 pmc
&= PCI_PM_CAP_PME_MASK
;
1578 dev_printk(KERN_DEBUG
, &dev
->dev
,
1579 "PME# supported from%s%s%s%s%s\n",
1580 (pmc
& PCI_PM_CAP_PME_D0
) ? " D0" : "",
1581 (pmc
& PCI_PM_CAP_PME_D1
) ? " D1" : "",
1582 (pmc
& PCI_PM_CAP_PME_D2
) ? " D2" : "",
1583 (pmc
& PCI_PM_CAP_PME_D3
) ? " D3hot" : "",
1584 (pmc
& PCI_PM_CAP_PME_D3cold
) ? " D3cold" : "");
1585 dev
->pme_support
= pmc
>> PCI_PM_CAP_PME_SHIFT
;
1587 * Make device's PM flags reflect the wake-up capability, but
1588 * let the user space enable it to wake up the system as needed.
1590 device_set_wakeup_capable(&dev
->dev
, true);
1591 device_set_wakeup_enable(&dev
->dev
, false);
1592 /* Disable the PME# generation functionality */
1593 pci_pme_active(dev
, false);
1595 dev
->pme_support
= 0;
1600 * platform_pci_wakeup_init - init platform wakeup if present
1603 * Some devices don't have PCI PM caps but can still generate wakeup
1604 * events through platform methods (like ACPI events). If @dev supports
1605 * platform wakeup events, set the device flag to indicate as much. This
1606 * may be redundant if the device also supports PCI PM caps, but double
1607 * initialization should be safe in that case.
1609 void platform_pci_wakeup_init(struct pci_dev
*dev
)
1611 if (!platform_pci_can_wakeup(dev
))
1614 device_set_wakeup_capable(&dev
->dev
, true);
1615 device_set_wakeup_enable(&dev
->dev
, false);
1616 platform_pci_sleep_wake(dev
, false);
1620 * pci_add_save_buffer - allocate buffer for saving given capability registers
1621 * @dev: the PCI device
1622 * @cap: the capability to allocate the buffer for
1623 * @size: requested size of the buffer
1625 static int pci_add_cap_save_buffer(
1626 struct pci_dev
*dev
, char cap
, unsigned int size
)
1629 struct pci_cap_saved_state
*save_state
;
1631 pos
= pci_find_capability(dev
, cap
);
1635 save_state
= kzalloc(sizeof(*save_state
) + size
, GFP_KERNEL
);
1639 save_state
->cap_nr
= cap
;
1640 pci_add_saved_cap(dev
, save_state
);
1646 * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
1647 * @dev: the PCI device
1649 void pci_allocate_cap_save_buffers(struct pci_dev
*dev
)
1653 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_EXP
,
1654 PCI_EXP_SAVE_REGS
* sizeof(u16
));
1657 "unable to preallocate PCI Express save buffer\n");
1659 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_PCIX
, sizeof(u16
));
1662 "unable to preallocate PCI-X save buffer\n");
1666 * pci_enable_ari - enable ARI forwarding if hardware support it
1667 * @dev: the PCI device
1669 void pci_enable_ari(struct pci_dev
*dev
)
1674 struct pci_dev
*bridge
;
1676 if (!pci_is_pcie(dev
) || dev
->devfn
)
1679 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
);
1683 bridge
= dev
->bus
->self
;
1684 if (!bridge
|| !pci_is_pcie(bridge
))
1687 pos
= pci_pcie_cap(bridge
);
1691 pci_read_config_dword(bridge
, pos
+ PCI_EXP_DEVCAP2
, &cap
);
1692 if (!(cap
& PCI_EXP_DEVCAP2_ARI
))
1695 pci_read_config_word(bridge
, pos
+ PCI_EXP_DEVCTL2
, &ctrl
);
1696 ctrl
|= PCI_EXP_DEVCTL2_ARI
;
1697 pci_write_config_word(bridge
, pos
+ PCI_EXP_DEVCTL2
, ctrl
);
1699 bridge
->ari_enabled
= 1;
1702 static int pci_acs_enable
;
1705 * pci_request_acs - ask for ACS to be enabled if supported
1707 void pci_request_acs(void)
1713 * pci_enable_acs - enable ACS if hardware support it
1714 * @dev: the PCI device
1716 void pci_enable_acs(struct pci_dev
*dev
)
1722 if (!pci_acs_enable
)
1725 if (!pci_is_pcie(dev
))
1728 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ACS
);
1732 pci_read_config_word(dev
, pos
+ PCI_ACS_CAP
, &cap
);
1733 pci_read_config_word(dev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
1735 /* Source Validation */
1736 ctrl
|= (cap
& PCI_ACS_SV
);
1738 /* P2P Request Redirect */
1739 ctrl
|= (cap
& PCI_ACS_RR
);
1741 /* P2P Completion Redirect */
1742 ctrl
|= (cap
& PCI_ACS_CR
);
1744 /* Upstream Forwarding */
1745 ctrl
|= (cap
& PCI_ACS_UF
);
1747 pci_write_config_word(dev
, pos
+ PCI_ACS_CTRL
, ctrl
);
1751 * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
1752 * @dev: the PCI device
1753 * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTD, 4=INTD)
1755 * Perform INTx swizzling for a device behind one level of bridge. This is
1756 * required by section 9.1 of the PCI-to-PCI bridge specification for devices
1757 * behind bridges on add-in cards. For devices with ARI enabled, the slot
1758 * number is always 0 (see the Implementation Note in section 2.2.8.1 of
1759 * the PCI Express Base Specification, Revision 2.1)
1761 u8
pci_swizzle_interrupt_pin(struct pci_dev
*dev
, u8 pin
)
1765 if (pci_ari_enabled(dev
->bus
))
1768 slot
= PCI_SLOT(dev
->devfn
);
1770 return (((pin
- 1) + slot
) % 4) + 1;
1774 pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
1782 while (!pci_is_root_bus(dev
->bus
)) {
1783 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
1784 dev
= dev
->bus
->self
;
1791 * pci_common_swizzle - swizzle INTx all the way to root bridge
1792 * @dev: the PCI device
1793 * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
1795 * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
1796 * bridges all the way up to a PCI root bus.
1798 u8
pci_common_swizzle(struct pci_dev
*dev
, u8
*pinp
)
1802 while (!pci_is_root_bus(dev
->bus
)) {
1803 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
1804 dev
= dev
->bus
->self
;
1807 return PCI_SLOT(dev
->devfn
);
1811 * pci_release_region - Release a PCI bar
1812 * @pdev: PCI device whose resources were previously reserved by pci_request_region
1813 * @bar: BAR to release
1815 * Releases the PCI I/O and memory resources previously reserved by a
1816 * successful call to pci_request_region. Call this function only
1817 * after all use of the PCI regions has ceased.
1819 void pci_release_region(struct pci_dev
*pdev
, int bar
)
1821 struct pci_devres
*dr
;
1823 if (pci_resource_len(pdev
, bar
) == 0)
1825 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
1826 release_region(pci_resource_start(pdev
, bar
),
1827 pci_resource_len(pdev
, bar
));
1828 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
1829 release_mem_region(pci_resource_start(pdev
, bar
),
1830 pci_resource_len(pdev
, bar
));
1832 dr
= find_pci_dr(pdev
);
1834 dr
->region_mask
&= ~(1 << bar
);
1838 * __pci_request_region - Reserved PCI I/O and memory resource
1839 * @pdev: PCI device whose resources are to be reserved
1840 * @bar: BAR to be reserved
1841 * @res_name: Name to be associated with resource.
1842 * @exclusive: whether the region access is exclusive or not
1844 * Mark the PCI region associated with PCI device @pdev BR @bar as
1845 * being reserved by owner @res_name. Do not access any
1846 * address inside the PCI regions unless this call returns
1849 * If @exclusive is set, then the region is marked so that userspace
1850 * is explicitly not allowed to map the resource via /dev/mem or
1851 * sysfs MMIO access.
1853 * Returns 0 on success, or %EBUSY on error. A warning
1854 * message is also printed on failure.
1856 static int __pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
,
1859 struct pci_devres
*dr
;
1861 if (pci_resource_len(pdev
, bar
) == 0)
1864 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
1865 if (!request_region(pci_resource_start(pdev
, bar
),
1866 pci_resource_len(pdev
, bar
), res_name
))
1869 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
1870 if (!__request_mem_region(pci_resource_start(pdev
, bar
),
1871 pci_resource_len(pdev
, bar
), res_name
,
1876 dr
= find_pci_dr(pdev
);
1878 dr
->region_mask
|= 1 << bar
;
1883 dev_warn(&pdev
->dev
, "BAR %d: can't reserve %pR\n", bar
,
1884 &pdev
->resource
[bar
]);
1889 * pci_request_region - Reserve PCI I/O and memory resource
1890 * @pdev: PCI device whose resources are to be reserved
1891 * @bar: BAR to be reserved
1892 * @res_name: Name to be associated with resource
1894 * Mark the PCI region associated with PCI device @pdev BAR @bar as
1895 * being reserved by owner @res_name. Do not access any
1896 * address inside the PCI regions unless this call returns
1899 * Returns 0 on success, or %EBUSY on error. A warning
1900 * message is also printed on failure.
1902 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
1904 return __pci_request_region(pdev
, bar
, res_name
, 0);
1908 * pci_request_region_exclusive - Reserved PCI I/O and memory resource
1909 * @pdev: PCI device whose resources are to be reserved
1910 * @bar: BAR to be reserved
1911 * @res_name: Name to be associated with resource.
1913 * Mark the PCI region associated with PCI device @pdev BR @bar as
1914 * being reserved by owner @res_name. Do not access any
1915 * address inside the PCI regions unless this call returns
1918 * Returns 0 on success, or %EBUSY on error. A warning
1919 * message is also printed on failure.
1921 * The key difference that _exclusive makes it that userspace is
1922 * explicitly not allowed to map the resource via /dev/mem or
1925 int pci_request_region_exclusive(struct pci_dev
*pdev
, int bar
, const char *res_name
)
1927 return __pci_request_region(pdev
, bar
, res_name
, IORESOURCE_EXCLUSIVE
);
1930 * pci_release_selected_regions - Release selected PCI I/O and memory resources
1931 * @pdev: PCI device whose resources were previously reserved
1932 * @bars: Bitmask of BARs to be released
1934 * Release selected PCI I/O and memory resources previously reserved.
1935 * Call this function only after all use of the PCI regions has ceased.
1937 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
1941 for (i
= 0; i
< 6; i
++)
1942 if (bars
& (1 << i
))
1943 pci_release_region(pdev
, i
);
1946 int __pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
1947 const char *res_name
, int excl
)
1951 for (i
= 0; i
< 6; i
++)
1952 if (bars
& (1 << i
))
1953 if (__pci_request_region(pdev
, i
, res_name
, excl
))
1959 if (bars
& (1 << i
))
1960 pci_release_region(pdev
, i
);
1967 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
1968 * @pdev: PCI device whose resources are to be reserved
1969 * @bars: Bitmask of BARs to be requested
1970 * @res_name: Name to be associated with resource
1972 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
1973 const char *res_name
)
1975 return __pci_request_selected_regions(pdev
, bars
, res_name
, 0);
1978 int pci_request_selected_regions_exclusive(struct pci_dev
*pdev
,
1979 int bars
, const char *res_name
)
1981 return __pci_request_selected_regions(pdev
, bars
, res_name
,
1982 IORESOURCE_EXCLUSIVE
);
1986 * pci_release_regions - Release reserved PCI I/O and memory resources
1987 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
1989 * Releases all PCI I/O and memory resources previously reserved by a
1990 * successful call to pci_request_regions. Call this function only
1991 * after all use of the PCI regions has ceased.
1994 void pci_release_regions(struct pci_dev
*pdev
)
1996 pci_release_selected_regions(pdev
, (1 << 6) - 1);
2000 * pci_request_regions - Reserved PCI I/O and memory resources
2001 * @pdev: PCI device whose resources are to be reserved
2002 * @res_name: Name to be associated with resource.
2004 * Mark all PCI regions associated with PCI device @pdev as
2005 * being reserved by owner @res_name. Do not access any
2006 * address inside the PCI regions unless this call returns
2009 * Returns 0 on success, or %EBUSY on error. A warning
2010 * message is also printed on failure.
2012 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
2014 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
2018 * pci_request_regions_exclusive - Reserved PCI I/O and memory resources
2019 * @pdev: PCI device whose resources are to be reserved
2020 * @res_name: Name to be associated with resource.
2022 * Mark all PCI regions associated with PCI device @pdev as
2023 * being reserved by owner @res_name. Do not access any
2024 * address inside the PCI regions unless this call returns
2027 * pci_request_regions_exclusive() will mark the region so that
2028 * /dev/mem and the sysfs MMIO access will not be allowed.
2030 * Returns 0 on success, or %EBUSY on error. A warning
2031 * message is also printed on failure.
2033 int pci_request_regions_exclusive(struct pci_dev
*pdev
, const char *res_name
)
2035 return pci_request_selected_regions_exclusive(pdev
,
2036 ((1 << 6) - 1), res_name
);
2039 static void __pci_set_master(struct pci_dev
*dev
, bool enable
)
2043 pci_read_config_word(dev
, PCI_COMMAND
, &old_cmd
);
2045 cmd
= old_cmd
| PCI_COMMAND_MASTER
;
2047 cmd
= old_cmd
& ~PCI_COMMAND_MASTER
;
2048 if (cmd
!= old_cmd
) {
2049 dev_dbg(&dev
->dev
, "%s bus mastering\n",
2050 enable
? "enabling" : "disabling");
2051 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2053 dev
->is_busmaster
= enable
;
2057 * pci_set_master - enables bus-mastering for device dev
2058 * @dev: the PCI device to enable
2060 * Enables bus-mastering on the device and calls pcibios_set_master()
2061 * to do the needed arch specific settings.
2063 void pci_set_master(struct pci_dev
*dev
)
2065 __pci_set_master(dev
, true);
2066 pcibios_set_master(dev
);
2070 * pci_clear_master - disables bus-mastering for device dev
2071 * @dev: the PCI device to disable
2073 void pci_clear_master(struct pci_dev
*dev
)
2075 __pci_set_master(dev
, false);
2079 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
2080 * @dev: the PCI device for which MWI is to be enabled
2082 * Helper function for pci_set_mwi.
2083 * Originally copied from drivers/net/acenic.c.
2084 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
2086 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2088 int pci_set_cacheline_size(struct pci_dev
*dev
)
2092 if (!pci_cache_line_size
)
2095 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
2096 equal to or multiple of the right value. */
2097 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
2098 if (cacheline_size
>= pci_cache_line_size
&&
2099 (cacheline_size
% pci_cache_line_size
) == 0)
2102 /* Write the correct value. */
2103 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
2105 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
2106 if (cacheline_size
== pci_cache_line_size
)
2109 dev_printk(KERN_DEBUG
, &dev
->dev
, "cache line size of %d is not "
2110 "supported\n", pci_cache_line_size
<< 2);
2114 EXPORT_SYMBOL_GPL(pci_set_cacheline_size
);
2116 #ifdef PCI_DISABLE_MWI
2117 int pci_set_mwi(struct pci_dev
*dev
)
2122 int pci_try_set_mwi(struct pci_dev
*dev
)
2127 void pci_clear_mwi(struct pci_dev
*dev
)
2134 * pci_set_mwi - enables memory-write-invalidate PCI transaction
2135 * @dev: the PCI device for which MWI is enabled
2137 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
2139 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2142 pci_set_mwi(struct pci_dev
*dev
)
2147 rc
= pci_set_cacheline_size(dev
);
2151 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
2152 if (! (cmd
& PCI_COMMAND_INVALIDATE
)) {
2153 dev_dbg(&dev
->dev
, "enabling Mem-Wr-Inval\n");
2154 cmd
|= PCI_COMMAND_INVALIDATE
;
2155 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2162 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
2163 * @dev: the PCI device for which MWI is enabled
2165 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
2166 * Callers are not required to check the return value.
2168 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
2170 int pci_try_set_mwi(struct pci_dev
*dev
)
2172 int rc
= pci_set_mwi(dev
);
2177 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
2178 * @dev: the PCI device to disable
2180 * Disables PCI Memory-Write-Invalidate transaction on the device
2183 pci_clear_mwi(struct pci_dev
*dev
)
2187 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
2188 if (cmd
& PCI_COMMAND_INVALIDATE
) {
2189 cmd
&= ~PCI_COMMAND_INVALIDATE
;
2190 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2193 #endif /* ! PCI_DISABLE_MWI */
2196 * pci_intx - enables/disables PCI INTx for device dev
2197 * @pdev: the PCI device to operate on
2198 * @enable: boolean: whether to enable or disable PCI INTx
2200 * Enables/disables PCI INTx for device dev
2203 pci_intx(struct pci_dev
*pdev
, int enable
)
2205 u16 pci_command
, new;
2207 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
2210 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
2212 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
2215 if (new != pci_command
) {
2216 struct pci_devres
*dr
;
2218 pci_write_config_word(pdev
, PCI_COMMAND
, new);
2220 dr
= find_pci_dr(pdev
);
2221 if (dr
&& !dr
->restore_intx
) {
2222 dr
->restore_intx
= 1;
2223 dr
->orig_intx
= !enable
;
2229 * pci_msi_off - disables any msi or msix capabilities
2230 * @dev: the PCI device to operate on
2232 * If you want to use msi see pci_enable_msi and friends.
2233 * This is a lower level primitive that allows us to disable
2234 * msi operation at the device level.
2236 void pci_msi_off(struct pci_dev
*dev
)
2241 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSI
);
2243 pci_read_config_word(dev
, pos
+ PCI_MSI_FLAGS
, &control
);
2244 control
&= ~PCI_MSI_FLAGS_ENABLE
;
2245 pci_write_config_word(dev
, pos
+ PCI_MSI_FLAGS
, control
);
2247 pos
= pci_find_capability(dev
, PCI_CAP_ID_MSIX
);
2249 pci_read_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, &control
);
2250 control
&= ~PCI_MSIX_FLAGS_ENABLE
;
2251 pci_write_config_word(dev
, pos
+ PCI_MSIX_FLAGS
, control
);
2255 #ifndef HAVE_ARCH_PCI_SET_DMA_MASK
2257 * These can be overridden by arch-specific implementations
2260 pci_set_dma_mask(struct pci_dev
*dev
, u64 mask
)
2262 if (!pci_dma_supported(dev
, mask
))
2265 dev
->dma_mask
= mask
;
2266 dev_dbg(&dev
->dev
, "using %dbit DMA mask\n", fls64(mask
));
2272 pci_set_consistent_dma_mask(struct pci_dev
*dev
, u64 mask
)
2274 if (!pci_dma_supported(dev
, mask
))
2277 dev
->dev
.coherent_dma_mask
= mask
;
2278 dev_dbg(&dev
->dev
, "using %dbit consistent DMA mask\n", fls64(mask
));
2284 #ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE
2285 int pci_set_dma_max_seg_size(struct pci_dev
*dev
, unsigned int size
)
2287 return dma_set_max_seg_size(&dev
->dev
, size
);
2289 EXPORT_SYMBOL(pci_set_dma_max_seg_size
);
2292 #ifndef HAVE_ARCH_PCI_SET_DMA_SEGMENT_BOUNDARY
2293 int pci_set_dma_seg_boundary(struct pci_dev
*dev
, unsigned long mask
)
2295 return dma_set_seg_boundary(&dev
->dev
, mask
);
2297 EXPORT_SYMBOL(pci_set_dma_seg_boundary
);
2300 static int pcie_flr(struct pci_dev
*dev
, int probe
)
2305 u16 status
, control
;
2307 pos
= pci_pcie_cap(dev
);
2311 pci_read_config_dword(dev
, pos
+ PCI_EXP_DEVCAP
, &cap
);
2312 if (!(cap
& PCI_EXP_DEVCAP_FLR
))
2318 /* Wait for Transaction Pending bit clean */
2319 for (i
= 0; i
< 4; i
++) {
2321 msleep((1 << (i
- 1)) * 100);
2323 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVSTA
, &status
);
2324 if (!(status
& PCI_EXP_DEVSTA_TRPND
))
2328 dev_err(&dev
->dev
, "transaction is not cleared; "
2329 "proceeding with reset anyway\n");
2332 pci_read_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, &control
);
2333 control
|= PCI_EXP_DEVCTL_BCR_FLR
;
2334 pci_write_config_word(dev
, pos
+ PCI_EXP_DEVCTL
, control
);
2341 static int pci_af_flr(struct pci_dev
*dev
, int probe
)
2348 pos
= pci_find_capability(dev
, PCI_CAP_ID_AF
);
2352 pci_read_config_byte(dev
, pos
+ PCI_AF_CAP
, &cap
);
2353 if (!(cap
& PCI_AF_CAP_TP
) || !(cap
& PCI_AF_CAP_FLR
))
2359 /* Wait for Transaction Pending bit clean */
2360 for (i
= 0; i
< 4; i
++) {
2362 msleep((1 << (i
- 1)) * 100);
2364 pci_read_config_byte(dev
, pos
+ PCI_AF_STATUS
, &status
);
2365 if (!(status
& PCI_AF_STATUS_TP
))
2369 dev_err(&dev
->dev
, "transaction is not cleared; "
2370 "proceeding with reset anyway\n");
2373 pci_write_config_byte(dev
, pos
+ PCI_AF_CTRL
, PCI_AF_CTRL_FLR
);
2379 static int pci_pm_reset(struct pci_dev
*dev
, int probe
)
2386 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &csr
);
2387 if (csr
& PCI_PM_CTRL_NO_SOFT_RESET
)
2393 if (dev
->current_state
!= PCI_D0
)
2396 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
2398 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
2399 pci_dev_d3_sleep(dev
);
2401 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
2403 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
2404 pci_dev_d3_sleep(dev
);
2409 static int pci_parent_bus_reset(struct pci_dev
*dev
, int probe
)
2412 struct pci_dev
*pdev
;
2414 if (pci_is_root_bus(dev
->bus
) || dev
->subordinate
|| !dev
->bus
->self
)
2417 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
2424 pci_read_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, &ctrl
);
2425 ctrl
|= PCI_BRIDGE_CTL_BUS_RESET
;
2426 pci_write_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, ctrl
);
2429 ctrl
&= ~PCI_BRIDGE_CTL_BUS_RESET
;
2430 pci_write_config_word(dev
->bus
->self
, PCI_BRIDGE_CONTROL
, ctrl
);
2436 static int pci_dev_reset(struct pci_dev
*dev
, int probe
)
2443 pci_block_user_cfg_access(dev
);
2444 /* block PM suspend, driver probe, etc. */
2445 down(&dev
->dev
.sem
);
2448 rc
= pci_dev_specific_reset(dev
, probe
);
2452 rc
= pcie_flr(dev
, probe
);
2456 rc
= pci_af_flr(dev
, probe
);
2460 rc
= pci_pm_reset(dev
, probe
);
2464 rc
= pci_parent_bus_reset(dev
, probe
);
2468 pci_unblock_user_cfg_access(dev
);
2475 * __pci_reset_function - reset a PCI device function
2476 * @dev: PCI device to reset
2478 * Some devices allow an individual function to be reset without affecting
2479 * other functions in the same device. The PCI device must be responsive
2480 * to PCI config space in order to use this function.
2482 * The device function is presumed to be unused when this function is called.
2483 * Resetting the device will make the contents of PCI configuration space
2484 * random, so any caller of this must be prepared to reinitialise the
2485 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
2488 * Returns 0 if the device function was successfully reset or negative if the
2489 * device doesn't support resetting a single function.
2491 int __pci_reset_function(struct pci_dev
*dev
)
2493 return pci_dev_reset(dev
, 0);
2495 EXPORT_SYMBOL_GPL(__pci_reset_function
);
2498 * pci_probe_reset_function - check whether the device can be safely reset
2499 * @dev: PCI device to reset
2501 * Some devices allow an individual function to be reset without affecting
2502 * other functions in the same device. The PCI device must be responsive
2503 * to PCI config space in order to use this function.
2505 * Returns 0 if the device function can be reset or negative if the
2506 * device doesn't support resetting a single function.
2508 int pci_probe_reset_function(struct pci_dev
*dev
)
2510 return pci_dev_reset(dev
, 1);
2514 * pci_reset_function - quiesce and reset a PCI device function
2515 * @dev: PCI device to reset
2517 * Some devices allow an individual function to be reset without affecting
2518 * other functions in the same device. The PCI device must be responsive
2519 * to PCI config space in order to use this function.
2521 * This function does not just reset the PCI portion of a device, but
2522 * clears all the state associated with the device. This function differs
2523 * from __pci_reset_function in that it saves and restores device state
2526 * Returns 0 if the device function was successfully reset or negative if the
2527 * device doesn't support resetting a single function.
2529 int pci_reset_function(struct pci_dev
*dev
)
2533 rc
= pci_dev_reset(dev
, 1);
2537 pci_save_state(dev
);
2540 * both INTx and MSI are disabled after the Interrupt Disable bit
2541 * is set and the Bus Master bit is cleared.
2543 pci_write_config_word(dev
, PCI_COMMAND
, PCI_COMMAND_INTX_DISABLE
);
2545 rc
= pci_dev_reset(dev
, 0);
2547 pci_restore_state(dev
);
2551 EXPORT_SYMBOL_GPL(pci_reset_function
);
2554 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
2555 * @dev: PCI device to query
2557 * Returns mmrbc: maximum designed memory read count in bytes
2558 * or appropriate error value.
2560 int pcix_get_max_mmrbc(struct pci_dev
*dev
)
2565 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
2569 err
= pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
);
2573 return (stat
& PCI_X_STATUS_MAX_READ
) >> 12;
2575 EXPORT_SYMBOL(pcix_get_max_mmrbc
);
2578 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
2579 * @dev: PCI device to query
2581 * Returns mmrbc: maximum memory read count in bytes
2582 * or appropriate error value.
2584 int pcix_get_mmrbc(struct pci_dev
*dev
)
2589 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
2593 ret
= pci_read_config_dword(dev
, cap
+ PCI_X_CMD
, &cmd
);
2595 ret
= 512 << ((cmd
& PCI_X_CMD_MAX_READ
) >> 2);
2599 EXPORT_SYMBOL(pcix_get_mmrbc
);
2602 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
2603 * @dev: PCI device to query
2604 * @mmrbc: maximum memory read count in bytes
2605 * valid values are 512, 1024, 2048, 4096
2607 * If possible sets maximum memory read byte count, some bridges have erratas
2608 * that prevent this.
2610 int pcix_set_mmrbc(struct pci_dev
*dev
, int mmrbc
)
2612 int cap
, err
= -EINVAL
;
2613 u32 stat
, cmd
, v
, o
;
2615 if (mmrbc
< 512 || mmrbc
> 4096 || !is_power_of_2(mmrbc
))
2618 v
= ffs(mmrbc
) - 10;
2620 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
2624 err
= pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
);
2628 if (v
> (stat
& PCI_X_STATUS_MAX_READ
) >> 21)
2631 err
= pci_read_config_dword(dev
, cap
+ PCI_X_CMD
, &cmd
);
2635 o
= (cmd
& PCI_X_CMD_MAX_READ
) >> 2;
2637 if (v
> o
&& dev
->bus
&&
2638 (dev
->bus
->bus_flags
& PCI_BUS_FLAGS_NO_MMRBC
))
2641 cmd
&= ~PCI_X_CMD_MAX_READ
;
2643 err
= pci_write_config_dword(dev
, cap
+ PCI_X_CMD
, cmd
);
2648 EXPORT_SYMBOL(pcix_set_mmrbc
);
2651 * pcie_get_readrq - get PCI Express read request size
2652 * @dev: PCI device to query
2654 * Returns maximum memory read request in bytes
2655 * or appropriate error value.
2657 int pcie_get_readrq(struct pci_dev
*dev
)
2662 cap
= pci_pcie_cap(dev
);
2666 ret
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
2668 ret
= 128 << ((ctl
& PCI_EXP_DEVCTL_READRQ
) >> 12);
2672 EXPORT_SYMBOL(pcie_get_readrq
);
2675 * pcie_set_readrq - set PCI Express maximum memory read request
2676 * @dev: PCI device to query
2677 * @rq: maximum memory read count in bytes
2678 * valid values are 128, 256, 512, 1024, 2048, 4096
2680 * If possible sets maximum read byte count
2682 int pcie_set_readrq(struct pci_dev
*dev
, int rq
)
2684 int cap
, err
= -EINVAL
;
2687 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
2690 v
= (ffs(rq
) - 8) << 12;
2692 cap
= pci_pcie_cap(dev
);
2696 err
= pci_read_config_word(dev
, cap
+ PCI_EXP_DEVCTL
, &ctl
);
2700 if ((ctl
& PCI_EXP_DEVCTL_READRQ
) != v
) {
2701 ctl
&= ~PCI_EXP_DEVCTL_READRQ
;
2703 err
= pci_write_config_dword(dev
, cap
+ PCI_EXP_DEVCTL
, ctl
);
2709 EXPORT_SYMBOL(pcie_set_readrq
);
2712 * pci_select_bars - Make BAR mask from the type of resource
2713 * @dev: the PCI device for which BAR mask is made
2714 * @flags: resource type mask to be selected
2716 * This helper routine makes bar mask from the type of resource.
2718 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
2721 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
2722 if (pci_resource_flags(dev
, i
) & flags
)
2728 * pci_resource_bar - get position of the BAR associated with a resource
2729 * @dev: the PCI device
2730 * @resno: the resource number
2731 * @type: the BAR type to be filled in
2733 * Returns BAR position in config space, or 0 if the BAR is invalid.
2735 int pci_resource_bar(struct pci_dev
*dev
, int resno
, enum pci_bar_type
*type
)
2739 if (resno
< PCI_ROM_RESOURCE
) {
2740 *type
= pci_bar_unknown
;
2741 return PCI_BASE_ADDRESS_0
+ 4 * resno
;
2742 } else if (resno
== PCI_ROM_RESOURCE
) {
2743 *type
= pci_bar_mem32
;
2744 return dev
->rom_base_reg
;
2745 } else if (resno
< PCI_BRIDGE_RESOURCES
) {
2746 /* device specific resource */
2747 reg
= pci_iov_resource_bar(dev
, resno
, type
);
2752 dev_err(&dev
->dev
, "BAR %d: invalid resource\n", resno
);
2757 * pci_set_vga_state - set VGA decode state on device and parents if requested
2758 * @dev: the PCI device
2759 * @decode: true = enable decoding, false = disable decoding
2760 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
2761 * @change_bridge: traverse ancestors and change bridges
2763 int pci_set_vga_state(struct pci_dev
*dev
, bool decode
,
2764 unsigned int command_bits
, bool change_bridge
)
2766 struct pci_bus
*bus
;
2767 struct pci_dev
*bridge
;
2770 WARN_ON(command_bits
& ~(PCI_COMMAND_IO
|PCI_COMMAND_MEMORY
));
2772 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
2774 cmd
|= command_bits
;
2776 cmd
&= ~command_bits
;
2777 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
2779 if (change_bridge
== false)
2786 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
2789 cmd
|= PCI_BRIDGE_CTL_VGA
;
2791 cmd
&= ~PCI_BRIDGE_CTL_VGA
;
2792 pci_write_config_word(bridge
, PCI_BRIDGE_CONTROL
,
2800 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
2801 static char resource_alignment_param
[RESOURCE_ALIGNMENT_PARAM_SIZE
] = {0};
2802 static DEFINE_SPINLOCK(resource_alignment_lock
);
2805 * pci_specified_resource_alignment - get resource alignment specified by user.
2806 * @dev: the PCI device to get
2808 * RETURNS: Resource alignment if it is specified.
2809 * Zero if it is not specified.
2811 resource_size_t
pci_specified_resource_alignment(struct pci_dev
*dev
)
2813 int seg
, bus
, slot
, func
, align_order
, count
;
2814 resource_size_t align
= 0;
2817 spin_lock(&resource_alignment_lock
);
2818 p
= resource_alignment_param
;
2821 if (sscanf(p
, "%d%n", &align_order
, &count
) == 1 &&
2827 if (sscanf(p
, "%x:%x:%x.%x%n",
2828 &seg
, &bus
, &slot
, &func
, &count
) != 4) {
2830 if (sscanf(p
, "%x:%x.%x%n",
2831 &bus
, &slot
, &func
, &count
) != 3) {
2832 /* Invalid format */
2833 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: %s\n",
2839 if (seg
== pci_domain_nr(dev
->bus
) &&
2840 bus
== dev
->bus
->number
&&
2841 slot
== PCI_SLOT(dev
->devfn
) &&
2842 func
== PCI_FUNC(dev
->devfn
)) {
2843 if (align_order
== -1) {
2846 align
= 1 << align_order
;
2851 if (*p
!= ';' && *p
!= ',') {
2852 /* End of param or invalid format */
2857 spin_unlock(&resource_alignment_lock
);
2862 * pci_is_reassigndev - check if specified PCI is target device to reassign
2863 * @dev: the PCI device to check
2865 * RETURNS: non-zero for PCI device is a target device to reassign,
2868 int pci_is_reassigndev(struct pci_dev
*dev
)
2870 return (pci_specified_resource_alignment(dev
) != 0);
2873 ssize_t
pci_set_resource_alignment_param(const char *buf
, size_t count
)
2875 if (count
> RESOURCE_ALIGNMENT_PARAM_SIZE
- 1)
2876 count
= RESOURCE_ALIGNMENT_PARAM_SIZE
- 1;
2877 spin_lock(&resource_alignment_lock
);
2878 strncpy(resource_alignment_param
, buf
, count
);
2879 resource_alignment_param
[count
] = '\0';
2880 spin_unlock(&resource_alignment_lock
);
2884 ssize_t
pci_get_resource_alignment_param(char *buf
, size_t size
)
2887 spin_lock(&resource_alignment_lock
);
2888 count
= snprintf(buf
, size
, "%s", resource_alignment_param
);
2889 spin_unlock(&resource_alignment_lock
);
2893 static ssize_t
pci_resource_alignment_show(struct bus_type
*bus
, char *buf
)
2895 return pci_get_resource_alignment_param(buf
, PAGE_SIZE
);
2898 static ssize_t
pci_resource_alignment_store(struct bus_type
*bus
,
2899 const char *buf
, size_t count
)
2901 return pci_set_resource_alignment_param(buf
, count
);
2904 BUS_ATTR(resource_alignment
, 0644, pci_resource_alignment_show
,
2905 pci_resource_alignment_store
);
2907 static int __init
pci_resource_alignment_sysfs_init(void)
2909 return bus_create_file(&pci_bus_type
,
2910 &bus_attr_resource_alignment
);
2913 late_initcall(pci_resource_alignment_sysfs_init
);
2915 static void __devinit
pci_no_domains(void)
2917 #ifdef CONFIG_PCI_DOMAINS
2918 pci_domains_supported
= 0;
2923 * pci_ext_cfg_enabled - can we access extended PCI config space?
2924 * @dev: The PCI device of the root bridge.
2926 * Returns 1 if we can access PCI extended config space (offsets
2927 * greater than 0xff). This is the default implementation. Architecture
2928 * implementations can override this.
2930 int __attribute__ ((weak
)) pci_ext_cfg_avail(struct pci_dev
*dev
)
2935 void __weak
pci_fixup_cardbus(struct pci_bus
*bus
)
2938 EXPORT_SYMBOL(pci_fixup_cardbus
);
2940 static int __init
pci_setup(char *str
)
2943 char *k
= strchr(str
, ',');
2946 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
2947 if (!strcmp(str
, "nomsi")) {
2949 } else if (!strcmp(str
, "noaer")) {
2951 } else if (!strcmp(str
, "nodomains")) {
2953 } else if (!strncmp(str
, "cbiosize=", 9)) {
2954 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
2955 } else if (!strncmp(str
, "cbmemsize=", 10)) {
2956 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
2957 } else if (!strncmp(str
, "resource_alignment=", 19)) {
2958 pci_set_resource_alignment_param(str
+ 19,
2960 } else if (!strncmp(str
, "ecrc=", 5)) {
2961 pcie_ecrc_get_policy(str
+ 5);
2962 } else if (!strncmp(str
, "hpiosize=", 9)) {
2963 pci_hotplug_io_size
= memparse(str
+ 9, &str
);
2964 } else if (!strncmp(str
, "hpmemsize=", 10)) {
2965 pci_hotplug_mem_size
= memparse(str
+ 10, &str
);
2967 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
2975 early_param("pci", pci_setup
);
2977 EXPORT_SYMBOL(pci_reenable_device
);
2978 EXPORT_SYMBOL(pci_enable_device_io
);
2979 EXPORT_SYMBOL(pci_enable_device_mem
);
2980 EXPORT_SYMBOL(pci_enable_device
);
2981 EXPORT_SYMBOL(pcim_enable_device
);
2982 EXPORT_SYMBOL(pcim_pin_device
);
2983 EXPORT_SYMBOL(pci_disable_device
);
2984 EXPORT_SYMBOL(pci_find_capability
);
2985 EXPORT_SYMBOL(pci_bus_find_capability
);
2986 EXPORT_SYMBOL(pci_release_regions
);
2987 EXPORT_SYMBOL(pci_request_regions
);
2988 EXPORT_SYMBOL(pci_request_regions_exclusive
);
2989 EXPORT_SYMBOL(pci_release_region
);
2990 EXPORT_SYMBOL(pci_request_region
);
2991 EXPORT_SYMBOL(pci_request_region_exclusive
);
2992 EXPORT_SYMBOL(pci_release_selected_regions
);
2993 EXPORT_SYMBOL(pci_request_selected_regions
);
2994 EXPORT_SYMBOL(pci_request_selected_regions_exclusive
);
2995 EXPORT_SYMBOL(pci_set_master
);
2996 EXPORT_SYMBOL(pci_clear_master
);
2997 EXPORT_SYMBOL(pci_set_mwi
);
2998 EXPORT_SYMBOL(pci_try_set_mwi
);
2999 EXPORT_SYMBOL(pci_clear_mwi
);
3000 EXPORT_SYMBOL_GPL(pci_intx
);
3001 EXPORT_SYMBOL(pci_set_dma_mask
);
3002 EXPORT_SYMBOL(pci_set_consistent_dma_mask
);
3003 EXPORT_SYMBOL(pci_assign_resource
);
3004 EXPORT_SYMBOL(pci_find_parent_resource
);
3005 EXPORT_SYMBOL(pci_select_bars
);
3007 EXPORT_SYMBOL(pci_set_power_state
);
3008 EXPORT_SYMBOL(pci_save_state
);
3009 EXPORT_SYMBOL(pci_restore_state
);
3010 EXPORT_SYMBOL(pci_pme_capable
);
3011 EXPORT_SYMBOL(pci_pme_active
);
3012 EXPORT_SYMBOL(pci_wake_from_d3
);
3013 EXPORT_SYMBOL(pci_target_state
);
3014 EXPORT_SYMBOL(pci_prepare_to_sleep
);
3015 EXPORT_SYMBOL(pci_back_from_sleep
);
3016 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state
);