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/acpi.h>
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/dmi.h>
14 #include <linux/init.h>
16 #include <linux/of_pci.h>
17 #include <linux/pci.h>
19 #include <linux/slab.h>
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
22 #include <linux/string.h>
23 #include <linux/log2.h>
24 #include <linux/pci-aspm.h>
25 #include <linux/pm_wakeup.h>
26 #include <linux/interrupt.h>
27 #include <linux/device.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/pci_hotplug.h>
30 #include <linux/vmalloc.h>
31 #include <asm/setup.h>
33 #include <linux/aer.h>
36 const char *pci_power_names
[] = {
37 "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
39 EXPORT_SYMBOL_GPL(pci_power_names
);
41 int isa_dma_bridge_buggy
;
42 EXPORT_SYMBOL(isa_dma_bridge_buggy
);
45 EXPORT_SYMBOL(pci_pci_problems
);
47 unsigned int pci_pm_d3_delay
;
49 static void pci_pme_list_scan(struct work_struct
*work
);
51 static LIST_HEAD(pci_pme_list
);
52 static DEFINE_MUTEX(pci_pme_list_mutex
);
53 static DECLARE_DELAYED_WORK(pci_pme_work
, pci_pme_list_scan
);
55 struct pci_pme_device
{
56 struct list_head list
;
60 #define PME_TIMEOUT 1000 /* How long between PME checks */
62 static void pci_dev_d3_sleep(struct pci_dev
*dev
)
64 unsigned int delay
= dev
->d3_delay
;
66 if (delay
< pci_pm_d3_delay
)
67 delay
= pci_pm_d3_delay
;
73 #ifdef CONFIG_PCI_DOMAINS
74 int pci_domains_supported
= 1;
77 #define DEFAULT_CARDBUS_IO_SIZE (256)
78 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
79 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
80 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
81 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
83 #define DEFAULT_HOTPLUG_IO_SIZE (256)
84 #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
85 /* pci=hpmemsize=nnM,hpiosize=nn can override this */
86 unsigned long pci_hotplug_io_size
= DEFAULT_HOTPLUG_IO_SIZE
;
87 unsigned long pci_hotplug_mem_size
= DEFAULT_HOTPLUG_MEM_SIZE
;
89 #define DEFAULT_HOTPLUG_BUS_SIZE 1
90 unsigned long pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
92 enum pcie_bus_config_types pcie_bus_config
= PCIE_BUS_DEFAULT
;
95 * The default CLS is used if arch didn't set CLS explicitly and not
96 * all pci devices agree on the same value. Arch can override either
97 * the dfl or actual value as it sees fit. Don't forget this is
98 * measured in 32-bit words, not bytes.
100 u8 pci_dfl_cache_line_size
= L1_CACHE_BYTES
>> 2;
101 u8 pci_cache_line_size
;
104 * If we set up a device for bus mastering, we need to check the latency
105 * timer as certain BIOSes forget to set it properly.
107 unsigned int pcibios_max_latency
= 255;
109 /* If set, the PCIe ARI capability will not be used. */
110 static bool pcie_ari_disabled
;
112 /* Disable bridge_d3 for all PCIe ports */
113 static bool pci_bridge_d3_disable
;
114 /* Force bridge_d3 for all PCIe ports */
115 static bool pci_bridge_d3_force
;
117 static int __init
pcie_port_pm_setup(char *str
)
119 if (!strcmp(str
, "off"))
120 pci_bridge_d3_disable
= true;
121 else if (!strcmp(str
, "force"))
122 pci_bridge_d3_force
= true;
125 __setup("pcie_port_pm=", pcie_port_pm_setup
);
128 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
129 * @bus: pointer to PCI bus structure to search
131 * Given a PCI bus, returns the highest PCI bus number present in the set
132 * including the given PCI bus and its list of child PCI buses.
134 unsigned char pci_bus_max_busnr(struct pci_bus
*bus
)
137 unsigned char max
, n
;
139 max
= bus
->busn_res
.end
;
140 list_for_each_entry(tmp
, &bus
->children
, node
) {
141 n
= pci_bus_max_busnr(tmp
);
147 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
149 #ifdef CONFIG_HAS_IOMEM
150 void __iomem
*pci_ioremap_bar(struct pci_dev
*pdev
, int bar
)
152 struct resource
*res
= &pdev
->resource
[bar
];
155 * Make sure the BAR is actually a memory resource, not an IO resource
157 if (res
->flags
& IORESOURCE_UNSET
|| !(res
->flags
& IORESOURCE_MEM
)) {
158 dev_warn(&pdev
->dev
, "can't ioremap BAR %d: %pR\n", bar
, res
);
161 return ioremap_nocache(res
->start
, resource_size(res
));
163 EXPORT_SYMBOL_GPL(pci_ioremap_bar
);
165 void __iomem
*pci_ioremap_wc_bar(struct pci_dev
*pdev
, int bar
)
168 * Make sure the BAR is actually a memory resource, not an IO resource
170 if (!(pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)) {
174 return ioremap_wc(pci_resource_start(pdev
, bar
),
175 pci_resource_len(pdev
, bar
));
177 EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar
);
181 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
182 u8 pos
, int cap
, int *ttl
)
187 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
193 pci_bus_read_config_word(bus
, devfn
, pos
, &ent
);
205 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
208 int ttl
= PCI_FIND_CAP_TTL
;
210 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
213 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
215 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
216 pos
+ PCI_CAP_LIST_NEXT
, cap
);
218 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
220 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
221 unsigned int devfn
, u8 hdr_type
)
225 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
226 if (!(status
& PCI_STATUS_CAP_LIST
))
230 case PCI_HEADER_TYPE_NORMAL
:
231 case PCI_HEADER_TYPE_BRIDGE
:
232 return PCI_CAPABILITY_LIST
;
233 case PCI_HEADER_TYPE_CARDBUS
:
234 return PCI_CB_CAPABILITY_LIST
;
241 * pci_find_capability - query for devices' capabilities
242 * @dev: PCI device to query
243 * @cap: capability code
245 * Tell if a device supports a given PCI capability.
246 * Returns the address of the requested capability structure within the
247 * device's PCI configuration space or 0 in case the device does not
248 * support it. Possible values for @cap:
250 * %PCI_CAP_ID_PM Power Management
251 * %PCI_CAP_ID_AGP Accelerated Graphics Port
252 * %PCI_CAP_ID_VPD Vital Product Data
253 * %PCI_CAP_ID_SLOTID Slot Identification
254 * %PCI_CAP_ID_MSI Message Signalled Interrupts
255 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
256 * %PCI_CAP_ID_PCIX PCI-X
257 * %PCI_CAP_ID_EXP PCI Express
259 int pci_find_capability(struct pci_dev
*dev
, int cap
)
263 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
265 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
269 EXPORT_SYMBOL(pci_find_capability
);
272 * pci_bus_find_capability - query for devices' capabilities
273 * @bus: the PCI bus to query
274 * @devfn: PCI device to query
275 * @cap: capability code
277 * Like pci_find_capability() but works for pci devices that do not have a
278 * pci_dev structure set up yet.
280 * Returns the address of the requested capability structure within the
281 * device's PCI configuration space or 0 in case the device does not
284 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
289 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
291 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
293 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
297 EXPORT_SYMBOL(pci_bus_find_capability
);
300 * pci_find_next_ext_capability - Find an extended capability
301 * @dev: PCI device to query
302 * @start: address at which to start looking (0 to start at beginning of list)
303 * @cap: capability code
305 * Returns the address of the next matching extended capability structure
306 * within the device's PCI configuration space or 0 if the device does
307 * not support it. Some capabilities can occur several times, e.g., the
308 * vendor-specific capability, and this provides a way to find them all.
310 int pci_find_next_ext_capability(struct pci_dev
*dev
, int start
, int cap
)
314 int pos
= PCI_CFG_SPACE_SIZE
;
316 /* minimum 8 bytes per capability */
317 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
319 if (dev
->cfg_size
<= PCI_CFG_SPACE_SIZE
)
325 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
329 * If we have no capabilities, this is indicated by cap ID,
330 * cap version and next pointer all being 0.
336 if (PCI_EXT_CAP_ID(header
) == cap
&& pos
!= start
)
339 pos
= PCI_EXT_CAP_NEXT(header
);
340 if (pos
< PCI_CFG_SPACE_SIZE
)
343 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
349 EXPORT_SYMBOL_GPL(pci_find_next_ext_capability
);
352 * pci_find_ext_capability - Find an extended capability
353 * @dev: PCI device to query
354 * @cap: capability code
356 * Returns the address of the requested extended capability structure
357 * within the device's PCI configuration space or 0 if the device does
358 * not support it. Possible values for @cap:
360 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
361 * %PCI_EXT_CAP_ID_VC Virtual Channel
362 * %PCI_EXT_CAP_ID_DSN Device Serial Number
363 * %PCI_EXT_CAP_ID_PWR Power Budgeting
365 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
367 return pci_find_next_ext_capability(dev
, 0, cap
);
369 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
371 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
373 int rc
, ttl
= PCI_FIND_CAP_TTL
;
376 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
377 mask
= HT_3BIT_CAP_MASK
;
379 mask
= HT_5BIT_CAP_MASK
;
381 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
382 PCI_CAP_ID_HT
, &ttl
);
384 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
385 if (rc
!= PCIBIOS_SUCCESSFUL
)
388 if ((cap
& mask
) == ht_cap
)
391 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
392 pos
+ PCI_CAP_LIST_NEXT
,
393 PCI_CAP_ID_HT
, &ttl
);
399 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
400 * @dev: PCI device to query
401 * @pos: Position from which to continue searching
402 * @ht_cap: Hypertransport capability code
404 * To be used in conjunction with pci_find_ht_capability() to search for
405 * all capabilities matching @ht_cap. @pos should always be a value returned
406 * from pci_find_ht_capability().
408 * NB. To be 100% safe against broken PCI devices, the caller should take
409 * steps to avoid an infinite loop.
411 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
413 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
415 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
418 * pci_find_ht_capability - query a device's Hypertransport capabilities
419 * @dev: PCI device to query
420 * @ht_cap: Hypertransport capability code
422 * Tell if a device supports a given Hypertransport capability.
423 * Returns an address within the device's PCI configuration space
424 * or 0 in case the device does not support the request capability.
425 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
426 * which has a Hypertransport capability matching @ht_cap.
428 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
432 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
434 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
438 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
441 * pci_find_parent_resource - return resource region of parent bus of given region
442 * @dev: PCI device structure contains resources to be searched
443 * @res: child resource record for which parent is sought
445 * For given resource region of given device, return the resource
446 * region of parent bus the given region is contained in.
448 struct resource
*pci_find_parent_resource(const struct pci_dev
*dev
,
449 struct resource
*res
)
451 const struct pci_bus
*bus
= dev
->bus
;
455 pci_bus_for_each_resource(bus
, r
, i
) {
458 if (res
->start
&& resource_contains(r
, res
)) {
461 * If the window is prefetchable but the BAR is
462 * not, the allocator made a mistake.
464 if (r
->flags
& IORESOURCE_PREFETCH
&&
465 !(res
->flags
& IORESOURCE_PREFETCH
))
469 * If we're below a transparent bridge, there may
470 * be both a positively-decoded aperture and a
471 * subtractively-decoded region that contain the BAR.
472 * We want the positively-decoded one, so this depends
473 * on pci_bus_for_each_resource() giving us those
481 EXPORT_SYMBOL(pci_find_parent_resource
);
484 * pci_find_resource - Return matching PCI device resource
485 * @dev: PCI device to query
486 * @res: Resource to look for
488 * Goes over standard PCI resources (BARs) and checks if the given resource
489 * is partially or fully contained in any of them. In that case the
490 * matching resource is returned, %NULL otherwise.
492 struct resource
*pci_find_resource(struct pci_dev
*dev
, struct resource
*res
)
496 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
497 struct resource
*r
= &dev
->resource
[i
];
499 if (r
->start
&& resource_contains(r
, res
))
505 EXPORT_SYMBOL(pci_find_resource
);
508 * pci_find_pcie_root_port - return PCIe Root Port
509 * @dev: PCI device to query
511 * Traverse up the parent chain and return the PCIe Root Port PCI Device
512 * for a given PCI Device.
514 struct pci_dev
*pci_find_pcie_root_port(struct pci_dev
*dev
)
516 struct pci_dev
*bridge
, *highest_pcie_bridge
= NULL
;
518 bridge
= pci_upstream_bridge(dev
);
519 while (bridge
&& pci_is_pcie(bridge
)) {
520 highest_pcie_bridge
= bridge
;
521 bridge
= pci_upstream_bridge(bridge
);
524 if (pci_pcie_type(highest_pcie_bridge
) != PCI_EXP_TYPE_ROOT_PORT
)
527 return highest_pcie_bridge
;
529 EXPORT_SYMBOL(pci_find_pcie_root_port
);
532 * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
533 * @dev: the PCI device to operate on
534 * @pos: config space offset of status word
535 * @mask: mask of bit(s) to care about in status word
537 * Return 1 when mask bit(s) in status word clear, 0 otherwise.
539 int pci_wait_for_pending(struct pci_dev
*dev
, int pos
, u16 mask
)
543 /* Wait for Transaction Pending bit clean */
544 for (i
= 0; i
< 4; i
++) {
547 msleep((1 << (i
- 1)) * 100);
549 pci_read_config_word(dev
, pos
, &status
);
550 if (!(status
& mask
))
558 * pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
559 * @dev: PCI device to have its BARs restored
561 * Restore the BAR values for a given device, so as to make it
562 * accessible by its driver.
564 static void pci_restore_bars(struct pci_dev
*dev
)
568 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++)
569 pci_update_resource(dev
, i
);
572 static const struct pci_platform_pm_ops
*pci_platform_pm
;
574 int pci_set_platform_pm(const struct pci_platform_pm_ops
*ops
)
576 if (!ops
->is_manageable
|| !ops
->set_state
|| !ops
->get_state
||
577 !ops
->choose_state
|| !ops
->sleep_wake
|| !ops
->run_wake
||
580 pci_platform_pm
= ops
;
584 static inline bool platform_pci_power_manageable(struct pci_dev
*dev
)
586 return pci_platform_pm
? pci_platform_pm
->is_manageable(dev
) : false;
589 static inline int platform_pci_set_power_state(struct pci_dev
*dev
,
592 return pci_platform_pm
? pci_platform_pm
->set_state(dev
, t
) : -ENOSYS
;
595 static inline pci_power_t
platform_pci_get_power_state(struct pci_dev
*dev
)
597 return pci_platform_pm
? pci_platform_pm
->get_state(dev
) : PCI_UNKNOWN
;
600 static inline pci_power_t
platform_pci_choose_state(struct pci_dev
*dev
)
602 return pci_platform_pm
?
603 pci_platform_pm
->choose_state(dev
) : PCI_POWER_ERROR
;
606 static inline int platform_pci_sleep_wake(struct pci_dev
*dev
, bool enable
)
608 return pci_platform_pm
?
609 pci_platform_pm
->sleep_wake(dev
, enable
) : -ENODEV
;
612 static inline int platform_pci_run_wake(struct pci_dev
*dev
, bool enable
)
614 return pci_platform_pm
?
615 pci_platform_pm
->run_wake(dev
, enable
) : -ENODEV
;
618 static inline bool platform_pci_need_resume(struct pci_dev
*dev
)
620 return pci_platform_pm
? pci_platform_pm
->need_resume(dev
) : false;
624 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
626 * @dev: PCI device to handle.
627 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
630 * -EINVAL if the requested state is invalid.
631 * -EIO if device does not support PCI PM or its PM capabilities register has a
632 * wrong version, or device doesn't support the requested state.
633 * 0 if device already is in the requested state.
634 * 0 if device's power state has been successfully changed.
636 static int pci_raw_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
639 bool need_restore
= false;
641 /* Check if we're already there */
642 if (dev
->current_state
== state
)
648 if (state
< PCI_D0
|| state
> PCI_D3hot
)
651 /* Validate current state:
652 * Can enter D0 from any state, but if we can only go deeper
653 * to sleep if we're already in a low power state
655 if (state
!= PCI_D0
&& dev
->current_state
<= PCI_D3cold
656 && dev
->current_state
> state
) {
657 dev_err(&dev
->dev
, "invalid power transition (from state %d to %d)\n",
658 dev
->current_state
, state
);
662 /* check if this device supports the desired state */
663 if ((state
== PCI_D1
&& !dev
->d1_support
)
664 || (state
== PCI_D2
&& !dev
->d2_support
))
667 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
669 /* If we're (effectively) in D3, force entire word to 0.
670 * This doesn't affect PME_Status, disables PME_En, and
671 * sets PowerState to 0.
673 switch (dev
->current_state
) {
677 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
682 case PCI_UNKNOWN
: /* Boot-up */
683 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
684 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
686 /* Fall-through: force to D0 */
692 /* enter specified state */
693 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
695 /* Mandatory power management transition delays */
696 /* see PCI PM 1.1 5.6.1 table 18 */
697 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
698 pci_dev_d3_sleep(dev
);
699 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
700 udelay(PCI_PM_D2_DELAY
);
702 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
703 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
704 if (dev
->current_state
!= state
&& printk_ratelimit())
705 dev_info(&dev
->dev
, "Refused to change power state, currently in D%d\n",
709 * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
710 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
711 * from D3hot to D0 _may_ perform an internal reset, thereby
712 * going to "D0 Uninitialized" rather than "D0 Initialized".
713 * For example, at least some versions of the 3c905B and the
714 * 3c556B exhibit this behaviour.
716 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
717 * devices in a D3hot state at boot. Consequently, we need to
718 * restore at least the BARs so that the device will be
719 * accessible to its driver.
722 pci_restore_bars(dev
);
725 pcie_aspm_pm_state_change(dev
->bus
->self
);
731 * pci_update_current_state - Read power state of given device and cache it
732 * @dev: PCI device to handle.
733 * @state: State to cache in case the device doesn't have the PM capability
735 * The power state is read from the PMCSR register, which however is
736 * inaccessible in D3cold. The platform firmware is therefore queried first
737 * to detect accessibility of the register. In case the platform firmware
738 * reports an incorrect state or the device isn't power manageable by the
739 * platform at all, we try to detect D3cold by testing accessibility of the
740 * vendor ID in config space.
742 void pci_update_current_state(struct pci_dev
*dev
, pci_power_t state
)
744 if (platform_pci_get_power_state(dev
) == PCI_D3cold
||
745 !pci_device_is_present(dev
)) {
746 dev
->current_state
= PCI_D3cold
;
747 } else if (dev
->pm_cap
) {
750 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
751 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
753 dev
->current_state
= state
;
758 * pci_power_up - Put the given device into D0 forcibly
759 * @dev: PCI device to power up
761 void pci_power_up(struct pci_dev
*dev
)
763 if (platform_pci_power_manageable(dev
))
764 platform_pci_set_power_state(dev
, PCI_D0
);
766 pci_raw_set_power_state(dev
, PCI_D0
);
767 pci_update_current_state(dev
, PCI_D0
);
771 * pci_platform_power_transition - Use platform to change device power state
772 * @dev: PCI device to handle.
773 * @state: State to put the device into.
775 static int pci_platform_power_transition(struct pci_dev
*dev
, pci_power_t state
)
779 if (platform_pci_power_manageable(dev
)) {
780 error
= platform_pci_set_power_state(dev
, state
);
782 pci_update_current_state(dev
, state
);
786 if (error
&& !dev
->pm_cap
) /* Fall back to PCI_D0 */
787 dev
->current_state
= PCI_D0
;
793 * pci_wakeup - Wake up a PCI device
794 * @pci_dev: Device to handle.
795 * @ign: ignored parameter
797 static int pci_wakeup(struct pci_dev
*pci_dev
, void *ign
)
799 pci_wakeup_event(pci_dev
);
800 pm_request_resume(&pci_dev
->dev
);
805 * pci_wakeup_bus - Walk given bus and wake up devices on it
806 * @bus: Top bus of the subtree to walk.
808 static void pci_wakeup_bus(struct pci_bus
*bus
)
811 pci_walk_bus(bus
, pci_wakeup
, NULL
);
815 * __pci_start_power_transition - Start power transition of a PCI device
816 * @dev: PCI device to handle.
817 * @state: State to put the device into.
819 static void __pci_start_power_transition(struct pci_dev
*dev
, pci_power_t state
)
821 if (state
== PCI_D0
) {
822 pci_platform_power_transition(dev
, PCI_D0
);
824 * Mandatory power management transition delays, see
825 * PCI Express Base Specification Revision 2.0 Section
826 * 6.6.1: Conventional Reset. Do not delay for
827 * devices powered on/off by corresponding bridge,
828 * because have already delayed for the bridge.
830 if (dev
->runtime_d3cold
) {
831 if (dev
->d3cold_delay
)
832 msleep(dev
->d3cold_delay
);
834 * When powering on a bridge from D3cold, the
835 * whole hierarchy may be powered on into
836 * D0uninitialized state, resume them to give
837 * them a chance to suspend again
839 pci_wakeup_bus(dev
->subordinate
);
845 * __pci_dev_set_current_state - Set current state of a PCI device
846 * @dev: Device to handle
847 * @data: pointer to state to be set
849 static int __pci_dev_set_current_state(struct pci_dev
*dev
, void *data
)
851 pci_power_t state
= *(pci_power_t
*)data
;
853 dev
->current_state
= state
;
858 * __pci_bus_set_current_state - Walk given bus and set current state of devices
859 * @bus: Top bus of the subtree to walk.
860 * @state: state to be set
862 static void __pci_bus_set_current_state(struct pci_bus
*bus
, pci_power_t state
)
865 pci_walk_bus(bus
, __pci_dev_set_current_state
, &state
);
869 * __pci_complete_power_transition - Complete power transition of a PCI device
870 * @dev: PCI device to handle.
871 * @state: State to put the device into.
873 * This function should not be called directly by device drivers.
875 int __pci_complete_power_transition(struct pci_dev
*dev
, pci_power_t state
)
881 ret
= pci_platform_power_transition(dev
, state
);
882 /* Power off the bridge may power off the whole hierarchy */
883 if (!ret
&& state
== PCI_D3cold
)
884 __pci_bus_set_current_state(dev
->subordinate
, PCI_D3cold
);
887 EXPORT_SYMBOL_GPL(__pci_complete_power_transition
);
890 * pci_set_power_state - Set the power state of a PCI device
891 * @dev: PCI device to handle.
892 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
894 * Transition a device to a new power state, using the platform firmware and/or
895 * the device's PCI PM registers.
898 * -EINVAL if the requested state is invalid.
899 * -EIO if device does not support PCI PM or its PM capabilities register has a
900 * wrong version, or device doesn't support the requested state.
901 * 0 if device already is in the requested state.
902 * 0 if device's power state has been successfully changed.
904 int pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
908 /* bound the state we're entering */
909 if (state
> PCI_D3cold
)
911 else if (state
< PCI_D0
)
913 else if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
915 * If the device or the parent bridge do not support PCI PM,
916 * ignore the request if we're doing anything other than putting
917 * it into D0 (which would only happen on boot).
921 /* Check if we're already there */
922 if (dev
->current_state
== state
)
925 __pci_start_power_transition(dev
, state
);
927 /* This device is quirked not to be put into D3, so
928 don't put it in D3 */
929 if (state
>= PCI_D3hot
&& (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3
))
933 * To put device in D3cold, we put device into D3hot in native
934 * way, then put device into D3cold with platform ops
936 error
= pci_raw_set_power_state(dev
, state
> PCI_D3hot
?
939 if (!__pci_complete_power_transition(dev
, state
))
944 EXPORT_SYMBOL(pci_set_power_state
);
947 * pci_choose_state - Choose the power state of a PCI device
948 * @dev: PCI device to be suspended
949 * @state: target sleep state for the whole system. This is the value
950 * that is passed to suspend() function.
952 * Returns PCI power state suitable for given device and given system
956 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
963 ret
= platform_pci_choose_state(dev
);
964 if (ret
!= PCI_POWER_ERROR
)
967 switch (state
.event
) {
970 case PM_EVENT_FREEZE
:
971 case PM_EVENT_PRETHAW
:
972 /* REVISIT both freeze and pre-thaw "should" use D0 */
973 case PM_EVENT_SUSPEND
:
974 case PM_EVENT_HIBERNATE
:
977 dev_info(&dev
->dev
, "unrecognized suspend event %d\n",
983 EXPORT_SYMBOL(pci_choose_state
);
985 #define PCI_EXP_SAVE_REGS 7
987 static struct pci_cap_saved_state
*_pci_find_saved_cap(struct pci_dev
*pci_dev
,
988 u16 cap
, bool extended
)
990 struct pci_cap_saved_state
*tmp
;
992 hlist_for_each_entry(tmp
, &pci_dev
->saved_cap_space
, next
) {
993 if (tmp
->cap
.cap_extended
== extended
&& tmp
->cap
.cap_nr
== cap
)
999 struct pci_cap_saved_state
*pci_find_saved_cap(struct pci_dev
*dev
, char cap
)
1001 return _pci_find_saved_cap(dev
, cap
, false);
1004 struct pci_cap_saved_state
*pci_find_saved_ext_cap(struct pci_dev
*dev
, u16 cap
)
1006 return _pci_find_saved_cap(dev
, cap
, true);
1009 static int pci_save_pcie_state(struct pci_dev
*dev
)
1012 struct pci_cap_saved_state
*save_state
;
1015 if (!pci_is_pcie(dev
))
1018 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1020 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1024 cap
= (u16
*)&save_state
->cap
.data
[0];
1025 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &cap
[i
++]);
1026 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL
, &cap
[i
++]);
1027 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL
, &cap
[i
++]);
1028 pcie_capability_read_word(dev
, PCI_EXP_RTCTL
, &cap
[i
++]);
1029 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL2
, &cap
[i
++]);
1030 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL2
, &cap
[i
++]);
1031 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL2
, &cap
[i
++]);
1036 static void pci_restore_pcie_state(struct pci_dev
*dev
)
1039 struct pci_cap_saved_state
*save_state
;
1042 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1046 cap
= (u16
*)&save_state
->cap
.data
[0];
1047 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL
, cap
[i
++]);
1048 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL
, cap
[i
++]);
1049 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL
, cap
[i
++]);
1050 pcie_capability_write_word(dev
, PCI_EXP_RTCTL
, cap
[i
++]);
1051 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL2
, cap
[i
++]);
1052 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL2
, cap
[i
++]);
1053 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL2
, cap
[i
++]);
1057 static int pci_save_pcix_state(struct pci_dev
*dev
)
1060 struct pci_cap_saved_state
*save_state
;
1062 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1066 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1068 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1072 pci_read_config_word(dev
, pos
+ PCI_X_CMD
,
1073 (u16
*)save_state
->cap
.data
);
1078 static void pci_restore_pcix_state(struct pci_dev
*dev
)
1081 struct pci_cap_saved_state
*save_state
;
1084 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1085 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1086 if (!save_state
|| !pos
)
1088 cap
= (u16
*)&save_state
->cap
.data
[0];
1090 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
1095 * pci_save_state - save the PCI configuration space of a device before suspending
1096 * @dev: - PCI device that we're dealing with
1098 int pci_save_state(struct pci_dev
*dev
)
1101 /* XXX: 100% dword access ok here? */
1102 for (i
= 0; i
< 16; i
++)
1103 pci_read_config_dword(dev
, i
* 4, &dev
->saved_config_space
[i
]);
1104 dev
->state_saved
= true;
1106 i
= pci_save_pcie_state(dev
);
1110 i
= pci_save_pcix_state(dev
);
1114 return pci_save_vc_state(dev
);
1116 EXPORT_SYMBOL(pci_save_state
);
1118 static void pci_restore_config_dword(struct pci_dev
*pdev
, int offset
,
1119 u32 saved_val
, int retry
)
1123 pci_read_config_dword(pdev
, offset
, &val
);
1124 if (val
== saved_val
)
1128 dev_dbg(&pdev
->dev
, "restoring config space at offset %#x (was %#x, writing %#x)\n",
1129 offset
, val
, saved_val
);
1130 pci_write_config_dword(pdev
, offset
, saved_val
);
1134 pci_read_config_dword(pdev
, offset
, &val
);
1135 if (val
== saved_val
)
1142 static void pci_restore_config_space_range(struct pci_dev
*pdev
,
1143 int start
, int end
, int retry
)
1147 for (index
= end
; index
>= start
; index
--)
1148 pci_restore_config_dword(pdev
, 4 * index
,
1149 pdev
->saved_config_space
[index
],
1153 static void pci_restore_config_space(struct pci_dev
*pdev
)
1155 if (pdev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
) {
1156 pci_restore_config_space_range(pdev
, 10, 15, 0);
1157 /* Restore BARs before the command register. */
1158 pci_restore_config_space_range(pdev
, 4, 9, 10);
1159 pci_restore_config_space_range(pdev
, 0, 3, 0);
1161 pci_restore_config_space_range(pdev
, 0, 15, 0);
1166 * pci_restore_state - Restore the saved state of a PCI device
1167 * @dev: - PCI device that we're dealing with
1169 void pci_restore_state(struct pci_dev
*dev
)
1171 if (!dev
->state_saved
)
1174 /* PCI Express register must be restored first */
1175 pci_restore_pcie_state(dev
);
1176 pci_restore_ats_state(dev
);
1177 pci_restore_vc_state(dev
);
1179 pci_cleanup_aer_error_status_regs(dev
);
1181 pci_restore_config_space(dev
);
1183 pci_restore_pcix_state(dev
);
1184 pci_restore_msi_state(dev
);
1186 /* Restore ACS and IOV configuration state */
1187 pci_enable_acs(dev
);
1188 pci_restore_iov_state(dev
);
1190 dev
->state_saved
= false;
1192 EXPORT_SYMBOL(pci_restore_state
);
1194 struct pci_saved_state
{
1195 u32 config_space
[16];
1196 struct pci_cap_saved_data cap
[0];
1200 * pci_store_saved_state - Allocate and return an opaque struct containing
1201 * the device saved state.
1202 * @dev: PCI device that we're dealing with
1204 * Return NULL if no state or error.
1206 struct pci_saved_state
*pci_store_saved_state(struct pci_dev
*dev
)
1208 struct pci_saved_state
*state
;
1209 struct pci_cap_saved_state
*tmp
;
1210 struct pci_cap_saved_data
*cap
;
1213 if (!dev
->state_saved
)
1216 size
= sizeof(*state
) + sizeof(struct pci_cap_saved_data
);
1218 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
)
1219 size
+= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1221 state
= kzalloc(size
, GFP_KERNEL
);
1225 memcpy(state
->config_space
, dev
->saved_config_space
,
1226 sizeof(state
->config_space
));
1229 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
) {
1230 size_t len
= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1231 memcpy(cap
, &tmp
->cap
, len
);
1232 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+ len
);
1234 /* Empty cap_save terminates list */
1238 EXPORT_SYMBOL_GPL(pci_store_saved_state
);
1241 * pci_load_saved_state - Reload the provided save state into struct pci_dev.
1242 * @dev: PCI device that we're dealing with
1243 * @state: Saved state returned from pci_store_saved_state()
1245 int pci_load_saved_state(struct pci_dev
*dev
,
1246 struct pci_saved_state
*state
)
1248 struct pci_cap_saved_data
*cap
;
1250 dev
->state_saved
= false;
1255 memcpy(dev
->saved_config_space
, state
->config_space
,
1256 sizeof(state
->config_space
));
1260 struct pci_cap_saved_state
*tmp
;
1262 tmp
= _pci_find_saved_cap(dev
, cap
->cap_nr
, cap
->cap_extended
);
1263 if (!tmp
|| tmp
->cap
.size
!= cap
->size
)
1266 memcpy(tmp
->cap
.data
, cap
->data
, tmp
->cap
.size
);
1267 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+
1268 sizeof(struct pci_cap_saved_data
) + cap
->size
);
1271 dev
->state_saved
= true;
1274 EXPORT_SYMBOL_GPL(pci_load_saved_state
);
1277 * pci_load_and_free_saved_state - Reload the save state pointed to by state,
1278 * and free the memory allocated for it.
1279 * @dev: PCI device that we're dealing with
1280 * @state: Pointer to saved state returned from pci_store_saved_state()
1282 int pci_load_and_free_saved_state(struct pci_dev
*dev
,
1283 struct pci_saved_state
**state
)
1285 int ret
= pci_load_saved_state(dev
, *state
);
1290 EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state
);
1292 int __weak
pcibios_enable_device(struct pci_dev
*dev
, int bars
)
1294 return pci_enable_resources(dev
, bars
);
1297 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
1300 struct pci_dev
*bridge
;
1304 err
= pci_set_power_state(dev
, PCI_D0
);
1305 if (err
< 0 && err
!= -EIO
)
1308 bridge
= pci_upstream_bridge(dev
);
1310 pcie_aspm_powersave_config_link(bridge
);
1312 err
= pcibios_enable_device(dev
, bars
);
1315 pci_fixup_device(pci_fixup_enable
, dev
);
1317 if (dev
->msi_enabled
|| dev
->msix_enabled
)
1320 pci_read_config_byte(dev
, PCI_INTERRUPT_PIN
, &pin
);
1322 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1323 if (cmd
& PCI_COMMAND_INTX_DISABLE
)
1324 pci_write_config_word(dev
, PCI_COMMAND
,
1325 cmd
& ~PCI_COMMAND_INTX_DISABLE
);
1332 * pci_reenable_device - Resume abandoned device
1333 * @dev: PCI device to be resumed
1335 * Note this function is a backend of pci_default_resume and is not supposed
1336 * to be called by normal code, write proper resume handler and use it instead.
1338 int pci_reenable_device(struct pci_dev
*dev
)
1340 if (pci_is_enabled(dev
))
1341 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
1344 EXPORT_SYMBOL(pci_reenable_device
);
1346 static void pci_enable_bridge(struct pci_dev
*dev
)
1348 struct pci_dev
*bridge
;
1351 bridge
= pci_upstream_bridge(dev
);
1353 pci_enable_bridge(bridge
);
1355 if (pci_is_enabled(dev
)) {
1356 if (!dev
->is_busmaster
)
1357 pci_set_master(dev
);
1361 retval
= pci_enable_device(dev
);
1363 dev_err(&dev
->dev
, "Error enabling bridge (%d), continuing\n",
1365 pci_set_master(dev
);
1368 static int pci_enable_device_flags(struct pci_dev
*dev
, unsigned long flags
)
1370 struct pci_dev
*bridge
;
1375 * Power state could be unknown at this point, either due to a fresh
1376 * boot or a device removal call. So get the current power state
1377 * so that things like MSI message writing will behave as expected
1378 * (e.g. if the device really is in D0 at enable time).
1382 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1383 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
1386 if (atomic_inc_return(&dev
->enable_cnt
) > 1)
1387 return 0; /* already enabled */
1389 bridge
= pci_upstream_bridge(dev
);
1391 pci_enable_bridge(bridge
);
1393 /* only skip sriov related */
1394 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1395 if (dev
->resource
[i
].flags
& flags
)
1397 for (i
= PCI_BRIDGE_RESOURCES
; i
< DEVICE_COUNT_RESOURCE
; i
++)
1398 if (dev
->resource
[i
].flags
& flags
)
1401 err
= do_pci_enable_device(dev
, bars
);
1403 atomic_dec(&dev
->enable_cnt
);
1408 * pci_enable_device_io - Initialize a device for use with IO space
1409 * @dev: PCI device to be initialized
1411 * Initialize device before it's used by a driver. Ask low-level code
1412 * to enable I/O resources. Wake up the device if it was suspended.
1413 * Beware, this function can fail.
1415 int pci_enable_device_io(struct pci_dev
*dev
)
1417 return pci_enable_device_flags(dev
, IORESOURCE_IO
);
1419 EXPORT_SYMBOL(pci_enable_device_io
);
1422 * pci_enable_device_mem - Initialize a device for use with Memory space
1423 * @dev: PCI device to be initialized
1425 * Initialize device before it's used by a driver. Ask low-level code
1426 * to enable Memory resources. Wake up the device if it was suspended.
1427 * Beware, this function can fail.
1429 int pci_enable_device_mem(struct pci_dev
*dev
)
1431 return pci_enable_device_flags(dev
, IORESOURCE_MEM
);
1433 EXPORT_SYMBOL(pci_enable_device_mem
);
1436 * pci_enable_device - Initialize device before it's used by a driver.
1437 * @dev: PCI device to be initialized
1439 * Initialize device before it's used by a driver. Ask low-level code
1440 * to enable I/O and memory. Wake up the device if it was suspended.
1441 * Beware, this function can fail.
1443 * Note we don't actually enable the device many times if we call
1444 * this function repeatedly (we just increment the count).
1446 int pci_enable_device(struct pci_dev
*dev
)
1448 return pci_enable_device_flags(dev
, IORESOURCE_MEM
| IORESOURCE_IO
);
1450 EXPORT_SYMBOL(pci_enable_device
);
1453 * Managed PCI resources. This manages device on/off, intx/msi/msix
1454 * on/off and BAR regions. pci_dev itself records msi/msix status, so
1455 * there's no need to track it separately. pci_devres is initialized
1456 * when a device is enabled using managed PCI device enable interface.
1459 unsigned int enabled
:1;
1460 unsigned int pinned
:1;
1461 unsigned int orig_intx
:1;
1462 unsigned int restore_intx
:1;
1466 static void pcim_release(struct device
*gendev
, void *res
)
1468 struct pci_dev
*dev
= to_pci_dev(gendev
);
1469 struct pci_devres
*this = res
;
1472 if (dev
->msi_enabled
)
1473 pci_disable_msi(dev
);
1474 if (dev
->msix_enabled
)
1475 pci_disable_msix(dev
);
1477 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
1478 if (this->region_mask
& (1 << i
))
1479 pci_release_region(dev
, i
);
1481 if (this->restore_intx
)
1482 pci_intx(dev
, this->orig_intx
);
1484 if (this->enabled
&& !this->pinned
)
1485 pci_disable_device(dev
);
1488 static struct pci_devres
*get_pci_dr(struct pci_dev
*pdev
)
1490 struct pci_devres
*dr
, *new_dr
;
1492 dr
= devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1496 new_dr
= devres_alloc(pcim_release
, sizeof(*new_dr
), GFP_KERNEL
);
1499 return devres_get(&pdev
->dev
, new_dr
, NULL
, NULL
);
1502 static struct pci_devres
*find_pci_dr(struct pci_dev
*pdev
)
1504 if (pci_is_managed(pdev
))
1505 return devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1510 * pcim_enable_device - Managed pci_enable_device()
1511 * @pdev: PCI device to be initialized
1513 * Managed pci_enable_device().
1515 int pcim_enable_device(struct pci_dev
*pdev
)
1517 struct pci_devres
*dr
;
1520 dr
= get_pci_dr(pdev
);
1526 rc
= pci_enable_device(pdev
);
1528 pdev
->is_managed
= 1;
1533 EXPORT_SYMBOL(pcim_enable_device
);
1536 * pcim_pin_device - Pin managed PCI device
1537 * @pdev: PCI device to pin
1539 * Pin managed PCI device @pdev. Pinned device won't be disabled on
1540 * driver detach. @pdev must have been enabled with
1541 * pcim_enable_device().
1543 void pcim_pin_device(struct pci_dev
*pdev
)
1545 struct pci_devres
*dr
;
1547 dr
= find_pci_dr(pdev
);
1548 WARN_ON(!dr
|| !dr
->enabled
);
1552 EXPORT_SYMBOL(pcim_pin_device
);
1555 * pcibios_add_device - provide arch specific hooks when adding device dev
1556 * @dev: the PCI device being added
1558 * Permits the platform to provide architecture specific functionality when
1559 * devices are added. This is the default implementation. Architecture
1560 * implementations can override this.
1562 int __weak
pcibios_add_device(struct pci_dev
*dev
)
1568 * pcibios_release_device - provide arch specific hooks when releasing device dev
1569 * @dev: the PCI device being released
1571 * Permits the platform to provide architecture specific functionality when
1572 * devices are released. This is the default implementation. Architecture
1573 * implementations can override this.
1575 void __weak
pcibios_release_device(struct pci_dev
*dev
) {}
1578 * pcibios_disable_device - disable arch specific PCI resources for device dev
1579 * @dev: the PCI device to disable
1581 * Disables architecture specific PCI resources for the device. This
1582 * is the default implementation. Architecture implementations can
1585 void __weak
pcibios_disable_device(struct pci_dev
*dev
) {}
1588 * pcibios_penalize_isa_irq - penalize an ISA IRQ
1589 * @irq: ISA IRQ to penalize
1590 * @active: IRQ active or not
1592 * Permits the platform to provide architecture-specific functionality when
1593 * penalizing ISA IRQs. This is the default implementation. Architecture
1594 * implementations can override this.
1596 void __weak
pcibios_penalize_isa_irq(int irq
, int active
) {}
1598 static void do_pci_disable_device(struct pci_dev
*dev
)
1602 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
1603 if (pci_command
& PCI_COMMAND_MASTER
) {
1604 pci_command
&= ~PCI_COMMAND_MASTER
;
1605 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
1608 pcibios_disable_device(dev
);
1612 * pci_disable_enabled_device - Disable device without updating enable_cnt
1613 * @dev: PCI device to disable
1615 * NOTE: This function is a backend of PCI power management routines and is
1616 * not supposed to be called drivers.
1618 void pci_disable_enabled_device(struct pci_dev
*dev
)
1620 if (pci_is_enabled(dev
))
1621 do_pci_disable_device(dev
);
1625 * pci_disable_device - Disable PCI device after use
1626 * @dev: PCI device to be disabled
1628 * Signal to the system that the PCI device is not in use by the system
1629 * anymore. This only involves disabling PCI bus-mastering, if active.
1631 * Note we don't actually disable the device until all callers of
1632 * pci_enable_device() have called pci_disable_device().
1634 void pci_disable_device(struct pci_dev
*dev
)
1636 struct pci_devres
*dr
;
1638 dr
= find_pci_dr(dev
);
1642 dev_WARN_ONCE(&dev
->dev
, atomic_read(&dev
->enable_cnt
) <= 0,
1643 "disabling already-disabled device");
1645 if (atomic_dec_return(&dev
->enable_cnt
) != 0)
1648 do_pci_disable_device(dev
);
1650 dev
->is_busmaster
= 0;
1652 EXPORT_SYMBOL(pci_disable_device
);
1655 * pcibios_set_pcie_reset_state - set reset state for device dev
1656 * @dev: the PCIe device reset
1657 * @state: Reset state to enter into
1660 * Sets the PCIe reset state for the device. This is the default
1661 * implementation. Architecture implementations can override this.
1663 int __weak
pcibios_set_pcie_reset_state(struct pci_dev
*dev
,
1664 enum pcie_reset_state state
)
1670 * pci_set_pcie_reset_state - set reset state for device dev
1671 * @dev: the PCIe device reset
1672 * @state: Reset state to enter into
1675 * Sets the PCI reset state for the device.
1677 int pci_set_pcie_reset_state(struct pci_dev
*dev
, enum pcie_reset_state state
)
1679 return pcibios_set_pcie_reset_state(dev
, state
);
1681 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state
);
1684 * pci_check_pme_status - Check if given device has generated PME.
1685 * @dev: Device to check.
1687 * Check the PME status of the device and if set, clear it and clear PME enable
1688 * (if set). Return 'true' if PME status and PME enable were both set or
1689 * 'false' otherwise.
1691 bool pci_check_pme_status(struct pci_dev
*dev
)
1700 pmcsr_pos
= dev
->pm_cap
+ PCI_PM_CTRL
;
1701 pci_read_config_word(dev
, pmcsr_pos
, &pmcsr
);
1702 if (!(pmcsr
& PCI_PM_CTRL_PME_STATUS
))
1705 /* Clear PME status. */
1706 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1707 if (pmcsr
& PCI_PM_CTRL_PME_ENABLE
) {
1708 /* Disable PME to avoid interrupt flood. */
1709 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1713 pci_write_config_word(dev
, pmcsr_pos
, pmcsr
);
1719 * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
1720 * @dev: Device to handle.
1721 * @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
1723 * Check if @dev has generated PME and queue a resume request for it in that
1726 static int pci_pme_wakeup(struct pci_dev
*dev
, void *pme_poll_reset
)
1728 if (pme_poll_reset
&& dev
->pme_poll
)
1729 dev
->pme_poll
= false;
1731 if (pci_check_pme_status(dev
)) {
1732 pci_wakeup_event(dev
);
1733 pm_request_resume(&dev
->dev
);
1739 * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
1740 * @bus: Top bus of the subtree to walk.
1742 void pci_pme_wakeup_bus(struct pci_bus
*bus
)
1745 pci_walk_bus(bus
, pci_pme_wakeup
, (void *)true);
1750 * pci_pme_capable - check the capability of PCI device to generate PME#
1751 * @dev: PCI device to handle.
1752 * @state: PCI state from which device will issue PME#.
1754 bool pci_pme_capable(struct pci_dev
*dev
, pci_power_t state
)
1759 return !!(dev
->pme_support
& (1 << state
));
1761 EXPORT_SYMBOL(pci_pme_capable
);
1763 static void pci_pme_list_scan(struct work_struct
*work
)
1765 struct pci_pme_device
*pme_dev
, *n
;
1767 mutex_lock(&pci_pme_list_mutex
);
1768 list_for_each_entry_safe(pme_dev
, n
, &pci_pme_list
, list
) {
1769 if (pme_dev
->dev
->pme_poll
) {
1770 struct pci_dev
*bridge
;
1772 bridge
= pme_dev
->dev
->bus
->self
;
1774 * If bridge is in low power state, the
1775 * configuration space of subordinate devices
1776 * may be not accessible
1778 if (bridge
&& bridge
->current_state
!= PCI_D0
)
1780 pci_pme_wakeup(pme_dev
->dev
, NULL
);
1782 list_del(&pme_dev
->list
);
1786 if (!list_empty(&pci_pme_list
))
1787 schedule_delayed_work(&pci_pme_work
,
1788 msecs_to_jiffies(PME_TIMEOUT
));
1789 mutex_unlock(&pci_pme_list_mutex
);
1792 static void __pci_pme_active(struct pci_dev
*dev
, bool enable
)
1796 if (!dev
->pme_support
)
1799 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1800 /* Clear PME_Status by writing 1 to it and enable PME# */
1801 pmcsr
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
1803 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1805 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1809 * pci_pme_active - enable or disable PCI device's PME# function
1810 * @dev: PCI device to handle.
1811 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1813 * The caller must verify that the device is capable of generating PME# before
1814 * calling this function with @enable equal to 'true'.
1816 void pci_pme_active(struct pci_dev
*dev
, bool enable
)
1818 __pci_pme_active(dev
, enable
);
1821 * PCI (as opposed to PCIe) PME requires that the device have
1822 * its PME# line hooked up correctly. Not all hardware vendors
1823 * do this, so the PME never gets delivered and the device
1824 * remains asleep. The easiest way around this is to
1825 * periodically walk the list of suspended devices and check
1826 * whether any have their PME flag set. The assumption is that
1827 * we'll wake up often enough anyway that this won't be a huge
1828 * hit, and the power savings from the devices will still be a
1831 * Although PCIe uses in-band PME message instead of PME# line
1832 * to report PME, PME does not work for some PCIe devices in
1833 * reality. For example, there are devices that set their PME
1834 * status bits, but don't really bother to send a PME message;
1835 * there are PCI Express Root Ports that don't bother to
1836 * trigger interrupts when they receive PME messages from the
1837 * devices below. So PME poll is used for PCIe devices too.
1840 if (dev
->pme_poll
) {
1841 struct pci_pme_device
*pme_dev
;
1843 pme_dev
= kmalloc(sizeof(struct pci_pme_device
),
1846 dev_warn(&dev
->dev
, "can't enable PME#\n");
1850 mutex_lock(&pci_pme_list_mutex
);
1851 list_add(&pme_dev
->list
, &pci_pme_list
);
1852 if (list_is_singular(&pci_pme_list
))
1853 schedule_delayed_work(&pci_pme_work
,
1854 msecs_to_jiffies(PME_TIMEOUT
));
1855 mutex_unlock(&pci_pme_list_mutex
);
1857 mutex_lock(&pci_pme_list_mutex
);
1858 list_for_each_entry(pme_dev
, &pci_pme_list
, list
) {
1859 if (pme_dev
->dev
== dev
) {
1860 list_del(&pme_dev
->list
);
1865 mutex_unlock(&pci_pme_list_mutex
);
1869 dev_dbg(&dev
->dev
, "PME# %s\n", enable
? "enabled" : "disabled");
1871 EXPORT_SYMBOL(pci_pme_active
);
1874 * __pci_enable_wake - enable PCI device as wakeup event source
1875 * @dev: PCI device affected
1876 * @state: PCI state from which device will issue wakeup events
1877 * @runtime: True if the events are to be generated at run time
1878 * @enable: True to enable event generation; false to disable
1880 * This enables the device as a wakeup event source, or disables it.
1881 * When such events involves platform-specific hooks, those hooks are
1882 * called automatically by this routine.
1884 * Devices with legacy power management (no standard PCI PM capabilities)
1885 * always require such platform hooks.
1888 * 0 is returned on success
1889 * -EINVAL is returned if device is not supposed to wake up the system
1890 * Error code depending on the platform is returned if both the platform and
1891 * the native mechanism fail to enable the generation of wake-up events
1893 int __pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
,
1894 bool runtime
, bool enable
)
1898 if (enable
&& !runtime
&& !device_may_wakeup(&dev
->dev
))
1901 /* Don't do the same thing twice in a row for one device. */
1902 if (!!enable
== !!dev
->wakeup_prepared
)
1906 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1907 * Anderson we should be doing PME# wake enable followed by ACPI wake
1908 * enable. To disable wake-up we call the platform first, for symmetry.
1914 if (pci_pme_capable(dev
, state
))
1915 pci_pme_active(dev
, true);
1918 error
= runtime
? platform_pci_run_wake(dev
, true) :
1919 platform_pci_sleep_wake(dev
, true);
1923 dev
->wakeup_prepared
= true;
1926 platform_pci_run_wake(dev
, false);
1928 platform_pci_sleep_wake(dev
, false);
1929 pci_pme_active(dev
, false);
1930 dev
->wakeup_prepared
= false;
1935 EXPORT_SYMBOL(__pci_enable_wake
);
1938 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1939 * @dev: PCI device to prepare
1940 * @enable: True to enable wake-up event generation; false to disable
1942 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1943 * and this function allows them to set that up cleanly - pci_enable_wake()
1944 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1945 * ordering constraints.
1947 * This function only returns error code if the device is not capable of
1948 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1949 * enable wake-up power for it.
1951 int pci_wake_from_d3(struct pci_dev
*dev
, bool enable
)
1953 return pci_pme_capable(dev
, PCI_D3cold
) ?
1954 pci_enable_wake(dev
, PCI_D3cold
, enable
) :
1955 pci_enable_wake(dev
, PCI_D3hot
, enable
);
1957 EXPORT_SYMBOL(pci_wake_from_d3
);
1960 * pci_target_state - find an appropriate low power state for a given PCI dev
1963 * Use underlying platform code to find a supported low power state for @dev.
1964 * If the platform can't manage @dev, return the deepest state from which it
1965 * can generate wake events, based on any available PME info.
1967 static pci_power_t
pci_target_state(struct pci_dev
*dev
)
1969 pci_power_t target_state
= PCI_D3hot
;
1971 if (platform_pci_power_manageable(dev
)) {
1973 * Call the platform to choose the target state of the device
1974 * and enable wake-up from this state if supported.
1976 pci_power_t state
= platform_pci_choose_state(dev
);
1979 case PCI_POWER_ERROR
:
1984 if (pci_no_d1d2(dev
))
1987 target_state
= state
;
1990 return target_state
;
1994 target_state
= PCI_D0
;
1997 * If the device is in D3cold even though it's not power-manageable by
1998 * the platform, it may have been powered down by non-standard means.
1999 * Best to let it slumber.
2001 if (dev
->current_state
== PCI_D3cold
)
2002 target_state
= PCI_D3cold
;
2004 if (device_may_wakeup(&dev
->dev
)) {
2006 * Find the deepest state from which the device can generate
2007 * wake-up events, make it the target state and enable device
2010 if (dev
->pme_support
) {
2012 && !(dev
->pme_support
& (1 << target_state
)))
2017 return target_state
;
2021 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
2022 * @dev: Device to handle.
2024 * Choose the power state appropriate for the device depending on whether
2025 * it can wake up the system and/or is power manageable by the platform
2026 * (PCI_D3hot is the default) and put the device into that state.
2028 int pci_prepare_to_sleep(struct pci_dev
*dev
)
2030 pci_power_t target_state
= pci_target_state(dev
);
2033 if (target_state
== PCI_POWER_ERROR
)
2036 pci_enable_wake(dev
, target_state
, device_may_wakeup(&dev
->dev
));
2038 error
= pci_set_power_state(dev
, target_state
);
2041 pci_enable_wake(dev
, target_state
, false);
2045 EXPORT_SYMBOL(pci_prepare_to_sleep
);
2048 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
2049 * @dev: Device to handle.
2051 * Disable device's system wake-up capability and put it into D0.
2053 int pci_back_from_sleep(struct pci_dev
*dev
)
2055 pci_enable_wake(dev
, PCI_D0
, false);
2056 return pci_set_power_state(dev
, PCI_D0
);
2058 EXPORT_SYMBOL(pci_back_from_sleep
);
2061 * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
2062 * @dev: PCI device being suspended.
2064 * Prepare @dev to generate wake-up events at run time and put it into a low
2067 int pci_finish_runtime_suspend(struct pci_dev
*dev
)
2069 pci_power_t target_state
= pci_target_state(dev
);
2072 if (target_state
== PCI_POWER_ERROR
)
2075 dev
->runtime_d3cold
= target_state
== PCI_D3cold
;
2077 __pci_enable_wake(dev
, target_state
, true, pci_dev_run_wake(dev
));
2079 error
= pci_set_power_state(dev
, target_state
);
2082 __pci_enable_wake(dev
, target_state
, true, false);
2083 dev
->runtime_d3cold
= false;
2090 * pci_dev_run_wake - Check if device can generate run-time wake-up events.
2091 * @dev: Device to check.
2093 * Return true if the device itself is capable of generating wake-up events
2094 * (through the platform or using the native PCIe PME) or if the device supports
2095 * PME and one of its upstream bridges can generate wake-up events.
2097 bool pci_dev_run_wake(struct pci_dev
*dev
)
2099 struct pci_bus
*bus
= dev
->bus
;
2101 if (device_run_wake(&dev
->dev
))
2104 if (!dev
->pme_support
)
2107 /* PME-capable in principle, but not from the intended sleep state */
2108 if (!pci_pme_capable(dev
, pci_target_state(dev
)))
2111 while (bus
->parent
) {
2112 struct pci_dev
*bridge
= bus
->self
;
2114 if (device_run_wake(&bridge
->dev
))
2120 /* We have reached the root bus. */
2122 return device_run_wake(bus
->bridge
);
2126 EXPORT_SYMBOL_GPL(pci_dev_run_wake
);
2129 * pci_dev_keep_suspended - Check if the device can stay in the suspended state.
2130 * @pci_dev: Device to check.
2132 * Return 'true' if the device is runtime-suspended, it doesn't have to be
2133 * reconfigured due to wakeup settings difference between system and runtime
2134 * suspend and the current power state of it is suitable for the upcoming
2135 * (system) transition.
2137 * If the device is not configured for system wakeup, disable PME for it before
2138 * returning 'true' to prevent it from waking up the system unnecessarily.
2140 bool pci_dev_keep_suspended(struct pci_dev
*pci_dev
)
2142 struct device
*dev
= &pci_dev
->dev
;
2144 if (!pm_runtime_suspended(dev
)
2145 || pci_target_state(pci_dev
) != pci_dev
->current_state
2146 || platform_pci_need_resume(pci_dev
))
2150 * At this point the device is good to go unless it's been configured
2151 * to generate PME at the runtime suspend time, but it is not supposed
2152 * to wake up the system. In that case, simply disable PME for it
2153 * (it will have to be re-enabled on exit from system resume).
2155 * If the device's power state is D3cold and the platform check above
2156 * hasn't triggered, the device's configuration is suitable and we don't
2157 * need to manipulate it at all.
2159 spin_lock_irq(&dev
->power
.lock
);
2161 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
&&
2162 !device_may_wakeup(dev
))
2163 __pci_pme_active(pci_dev
, false);
2165 spin_unlock_irq(&dev
->power
.lock
);
2170 * pci_dev_complete_resume - Finalize resume from system sleep for a device.
2171 * @pci_dev: Device to handle.
2173 * If the device is runtime suspended and wakeup-capable, enable PME for it as
2174 * it might have been disabled during the prepare phase of system suspend if
2175 * the device was not configured for system wakeup.
2177 void pci_dev_complete_resume(struct pci_dev
*pci_dev
)
2179 struct device
*dev
= &pci_dev
->dev
;
2181 if (!pci_dev_run_wake(pci_dev
))
2184 spin_lock_irq(&dev
->power
.lock
);
2186 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
)
2187 __pci_pme_active(pci_dev
, true);
2189 spin_unlock_irq(&dev
->power
.lock
);
2192 void pci_config_pm_runtime_get(struct pci_dev
*pdev
)
2194 struct device
*dev
= &pdev
->dev
;
2195 struct device
*parent
= dev
->parent
;
2198 pm_runtime_get_sync(parent
);
2199 pm_runtime_get_noresume(dev
);
2201 * pdev->current_state is set to PCI_D3cold during suspending,
2202 * so wait until suspending completes
2204 pm_runtime_barrier(dev
);
2206 * Only need to resume devices in D3cold, because config
2207 * registers are still accessible for devices suspended but
2210 if (pdev
->current_state
== PCI_D3cold
)
2211 pm_runtime_resume(dev
);
2214 void pci_config_pm_runtime_put(struct pci_dev
*pdev
)
2216 struct device
*dev
= &pdev
->dev
;
2217 struct device
*parent
= dev
->parent
;
2219 pm_runtime_put(dev
);
2221 pm_runtime_put_sync(parent
);
2225 * pci_bridge_d3_possible - Is it possible to put the bridge into D3
2226 * @bridge: Bridge to check
2228 * This function checks if it is possible to move the bridge to D3.
2229 * Currently we only allow D3 for recent enough PCIe ports.
2231 bool pci_bridge_d3_possible(struct pci_dev
*bridge
)
2235 if (!pci_is_pcie(bridge
))
2238 switch (pci_pcie_type(bridge
)) {
2239 case PCI_EXP_TYPE_ROOT_PORT
:
2240 case PCI_EXP_TYPE_UPSTREAM
:
2241 case PCI_EXP_TYPE_DOWNSTREAM
:
2242 if (pci_bridge_d3_disable
)
2246 * Hotplug interrupts cannot be delivered if the link is down,
2247 * so parents of a hotplug port must stay awake. In addition,
2248 * hotplug ports handled by firmware in System Management Mode
2249 * may not be put into D3 by the OS (Thunderbolt on non-Macs).
2250 * For simplicity, disallow in general for now.
2252 if (bridge
->is_hotplug_bridge
)
2255 if (pci_bridge_d3_force
)
2259 * It should be safe to put PCIe ports from 2015 or newer
2262 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) &&
2272 static int pci_dev_check_d3cold(struct pci_dev
*dev
, void *data
)
2274 bool *d3cold_ok
= data
;
2276 if (/* The device needs to be allowed to go D3cold ... */
2277 dev
->no_d3cold
|| !dev
->d3cold_allowed
||
2279 /* ... and if it is wakeup capable to do so from D3cold. */
2280 (device_may_wakeup(&dev
->dev
) &&
2281 !pci_pme_capable(dev
, PCI_D3cold
)) ||
2283 /* If it is a bridge it must be allowed to go to D3. */
2284 !pci_power_manageable(dev
))
2292 * pci_bridge_d3_update - Update bridge D3 capabilities
2293 * @dev: PCI device which is changed
2295 * Update upstream bridge PM capabilities accordingly depending on if the
2296 * device PM configuration was changed or the device is being removed. The
2297 * change is also propagated upstream.
2299 void pci_bridge_d3_update(struct pci_dev
*dev
)
2301 bool remove
= !device_is_registered(&dev
->dev
);
2302 struct pci_dev
*bridge
;
2303 bool d3cold_ok
= true;
2305 bridge
= pci_upstream_bridge(dev
);
2306 if (!bridge
|| !pci_bridge_d3_possible(bridge
))
2310 * If D3 is currently allowed for the bridge, removing one of its
2311 * children won't change that.
2313 if (remove
&& bridge
->bridge_d3
)
2317 * If D3 is currently allowed for the bridge and a child is added or
2318 * changed, disallowance of D3 can only be caused by that child, so
2319 * we only need to check that single device, not any of its siblings.
2321 * If D3 is currently not allowed for the bridge, checking the device
2322 * first may allow us to skip checking its siblings.
2325 pci_dev_check_d3cold(dev
, &d3cold_ok
);
2328 * If D3 is currently not allowed for the bridge, this may be caused
2329 * either by the device being changed/removed or any of its siblings,
2330 * so we need to go through all children to find out if one of them
2331 * continues to block D3.
2333 if (d3cold_ok
&& !bridge
->bridge_d3
)
2334 pci_walk_bus(bridge
->subordinate
, pci_dev_check_d3cold
,
2337 if (bridge
->bridge_d3
!= d3cold_ok
) {
2338 bridge
->bridge_d3
= d3cold_ok
;
2339 /* Propagate change to upstream bridges */
2340 pci_bridge_d3_update(bridge
);
2345 * pci_d3cold_enable - Enable D3cold for device
2346 * @dev: PCI device to handle
2348 * This function can be used in drivers to enable D3cold from the device
2349 * they handle. It also updates upstream PCI bridge PM capabilities
2352 void pci_d3cold_enable(struct pci_dev
*dev
)
2354 if (dev
->no_d3cold
) {
2355 dev
->no_d3cold
= false;
2356 pci_bridge_d3_update(dev
);
2359 EXPORT_SYMBOL_GPL(pci_d3cold_enable
);
2362 * pci_d3cold_disable - Disable D3cold for device
2363 * @dev: PCI device to handle
2365 * This function can be used in drivers to disable D3cold from the device
2366 * they handle. It also updates upstream PCI bridge PM capabilities
2369 void pci_d3cold_disable(struct pci_dev
*dev
)
2371 if (!dev
->no_d3cold
) {
2372 dev
->no_d3cold
= true;
2373 pci_bridge_d3_update(dev
);
2376 EXPORT_SYMBOL_GPL(pci_d3cold_disable
);
2379 * pci_pm_init - Initialize PM functions of given PCI device
2380 * @dev: PCI device to handle.
2382 void pci_pm_init(struct pci_dev
*dev
)
2387 pm_runtime_forbid(&dev
->dev
);
2388 pm_runtime_set_active(&dev
->dev
);
2389 pm_runtime_enable(&dev
->dev
);
2390 device_enable_async_suspend(&dev
->dev
);
2391 dev
->wakeup_prepared
= false;
2394 dev
->pme_support
= 0;
2396 /* find PCI PM capability in list */
2397 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
2400 /* Check device's ability to generate PME# */
2401 pci_read_config_word(dev
, pm
+ PCI_PM_PMC
, &pmc
);
2403 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
2404 dev_err(&dev
->dev
, "unsupported PM cap regs version (%u)\n",
2405 pmc
& PCI_PM_CAP_VER_MASK
);
2410 dev
->d3_delay
= PCI_PM_D3_WAIT
;
2411 dev
->d3cold_delay
= PCI_PM_D3COLD_WAIT
;
2412 dev
->bridge_d3
= pci_bridge_d3_possible(dev
);
2413 dev
->d3cold_allowed
= true;
2415 dev
->d1_support
= false;
2416 dev
->d2_support
= false;
2417 if (!pci_no_d1d2(dev
)) {
2418 if (pmc
& PCI_PM_CAP_D1
)
2419 dev
->d1_support
= true;
2420 if (pmc
& PCI_PM_CAP_D2
)
2421 dev
->d2_support
= true;
2423 if (dev
->d1_support
|| dev
->d2_support
)
2424 dev_printk(KERN_DEBUG
, &dev
->dev
, "supports%s%s\n",
2425 dev
->d1_support
? " D1" : "",
2426 dev
->d2_support
? " D2" : "");
2429 pmc
&= PCI_PM_CAP_PME_MASK
;
2431 dev_printk(KERN_DEBUG
, &dev
->dev
,
2432 "PME# supported from%s%s%s%s%s\n",
2433 (pmc
& PCI_PM_CAP_PME_D0
) ? " D0" : "",
2434 (pmc
& PCI_PM_CAP_PME_D1
) ? " D1" : "",
2435 (pmc
& PCI_PM_CAP_PME_D2
) ? " D2" : "",
2436 (pmc
& PCI_PM_CAP_PME_D3
) ? " D3hot" : "",
2437 (pmc
& PCI_PM_CAP_PME_D3cold
) ? " D3cold" : "");
2438 dev
->pme_support
= pmc
>> PCI_PM_CAP_PME_SHIFT
;
2439 dev
->pme_poll
= true;
2441 * Make device's PM flags reflect the wake-up capability, but
2442 * let the user space enable it to wake up the system as needed.
2444 device_set_wakeup_capable(&dev
->dev
, true);
2445 /* Disable the PME# generation functionality */
2446 pci_pme_active(dev
, false);
2450 static unsigned long pci_ea_flags(struct pci_dev
*dev
, u8 prop
)
2452 unsigned long flags
= IORESOURCE_PCI_FIXED
| IORESOURCE_PCI_EA_BEI
;
2456 case PCI_EA_P_VF_MEM
:
2457 flags
|= IORESOURCE_MEM
;
2459 case PCI_EA_P_MEM_PREFETCH
:
2460 case PCI_EA_P_VF_MEM_PREFETCH
:
2461 flags
|= IORESOURCE_MEM
| IORESOURCE_PREFETCH
;
2464 flags
|= IORESOURCE_IO
;
2473 static struct resource
*pci_ea_get_resource(struct pci_dev
*dev
, u8 bei
,
2476 if (bei
<= PCI_EA_BEI_BAR5
&& prop
<= PCI_EA_P_IO
)
2477 return &dev
->resource
[bei
];
2478 #ifdef CONFIG_PCI_IOV
2479 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
&&
2480 (prop
== PCI_EA_P_VF_MEM
|| prop
== PCI_EA_P_VF_MEM_PREFETCH
))
2481 return &dev
->resource
[PCI_IOV_RESOURCES
+
2482 bei
- PCI_EA_BEI_VF_BAR0
];
2484 else if (bei
== PCI_EA_BEI_ROM
)
2485 return &dev
->resource
[PCI_ROM_RESOURCE
];
2490 /* Read an Enhanced Allocation (EA) entry */
2491 static int pci_ea_read(struct pci_dev
*dev
, int offset
)
2493 struct resource
*res
;
2494 int ent_size
, ent_offset
= offset
;
2495 resource_size_t start
, end
;
2496 unsigned long flags
;
2497 u32 dw0
, bei
, base
, max_offset
;
2499 bool support_64
= (sizeof(resource_size_t
) >= 8);
2501 pci_read_config_dword(dev
, ent_offset
, &dw0
);
2504 /* Entry size field indicates DWORDs after 1st */
2505 ent_size
= ((dw0
& PCI_EA_ES
) + 1) << 2;
2507 if (!(dw0
& PCI_EA_ENABLE
)) /* Entry not enabled */
2510 bei
= (dw0
& PCI_EA_BEI
) >> 4;
2511 prop
= (dw0
& PCI_EA_PP
) >> 8;
2514 * If the Property is in the reserved range, try the Secondary
2517 if (prop
> PCI_EA_P_BRIDGE_IO
&& prop
< PCI_EA_P_MEM_RESERVED
)
2518 prop
= (dw0
& PCI_EA_SP
) >> 16;
2519 if (prop
> PCI_EA_P_BRIDGE_IO
)
2522 res
= pci_ea_get_resource(dev
, bei
, prop
);
2524 dev_err(&dev
->dev
, "Unsupported EA entry BEI: %u\n", bei
);
2528 flags
= pci_ea_flags(dev
, prop
);
2530 dev_err(&dev
->dev
, "Unsupported EA properties: %#x\n", prop
);
2535 pci_read_config_dword(dev
, ent_offset
, &base
);
2536 start
= (base
& PCI_EA_FIELD_MASK
);
2539 /* Read MaxOffset */
2540 pci_read_config_dword(dev
, ent_offset
, &max_offset
);
2543 /* Read Base MSBs (if 64-bit entry) */
2544 if (base
& PCI_EA_IS_64
) {
2547 pci_read_config_dword(dev
, ent_offset
, &base_upper
);
2550 flags
|= IORESOURCE_MEM_64
;
2552 /* entry starts above 32-bit boundary, can't use */
2553 if (!support_64
&& base_upper
)
2557 start
|= ((u64
)base_upper
<< 32);
2560 end
= start
+ (max_offset
| 0x03);
2562 /* Read MaxOffset MSBs (if 64-bit entry) */
2563 if (max_offset
& PCI_EA_IS_64
) {
2564 u32 max_offset_upper
;
2566 pci_read_config_dword(dev
, ent_offset
, &max_offset_upper
);
2569 flags
|= IORESOURCE_MEM_64
;
2571 /* entry too big, can't use */
2572 if (!support_64
&& max_offset_upper
)
2576 end
+= ((u64
)max_offset_upper
<< 32);
2580 dev_err(&dev
->dev
, "EA Entry crosses address boundary\n");
2584 if (ent_size
!= ent_offset
- offset
) {
2586 "EA Entry Size (%d) does not match length read (%d)\n",
2587 ent_size
, ent_offset
- offset
);
2591 res
->name
= pci_name(dev
);
2596 if (bei
<= PCI_EA_BEI_BAR5
)
2597 dev_printk(KERN_DEBUG
, &dev
->dev
, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2599 else if (bei
== PCI_EA_BEI_ROM
)
2600 dev_printk(KERN_DEBUG
, &dev
->dev
, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n",
2602 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
)
2603 dev_printk(KERN_DEBUG
, &dev
->dev
, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2604 bei
- PCI_EA_BEI_VF_BAR0
, res
, prop
);
2606 dev_printk(KERN_DEBUG
, &dev
->dev
, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n",
2610 return offset
+ ent_size
;
2613 /* Enhanced Allocation Initialization */
2614 void pci_ea_init(struct pci_dev
*dev
)
2621 /* find PCI EA capability in list */
2622 ea
= pci_find_capability(dev
, PCI_CAP_ID_EA
);
2626 /* determine the number of entries */
2627 pci_bus_read_config_byte(dev
->bus
, dev
->devfn
, ea
+ PCI_EA_NUM_ENT
,
2629 num_ent
&= PCI_EA_NUM_ENT_MASK
;
2631 offset
= ea
+ PCI_EA_FIRST_ENT
;
2633 /* Skip DWORD 2 for type 1 functions */
2634 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
)
2637 /* parse each EA entry */
2638 for (i
= 0; i
< num_ent
; ++i
)
2639 offset
= pci_ea_read(dev
, offset
);
2642 static void pci_add_saved_cap(struct pci_dev
*pci_dev
,
2643 struct pci_cap_saved_state
*new_cap
)
2645 hlist_add_head(&new_cap
->next
, &pci_dev
->saved_cap_space
);
2649 * _pci_add_cap_save_buffer - allocate buffer for saving given
2650 * capability registers
2651 * @dev: the PCI device
2652 * @cap: the capability to allocate the buffer for
2653 * @extended: Standard or Extended capability ID
2654 * @size: requested size of the buffer
2656 static int _pci_add_cap_save_buffer(struct pci_dev
*dev
, u16 cap
,
2657 bool extended
, unsigned int size
)
2660 struct pci_cap_saved_state
*save_state
;
2663 pos
= pci_find_ext_capability(dev
, cap
);
2665 pos
= pci_find_capability(dev
, cap
);
2670 save_state
= kzalloc(sizeof(*save_state
) + size
, GFP_KERNEL
);
2674 save_state
->cap
.cap_nr
= cap
;
2675 save_state
->cap
.cap_extended
= extended
;
2676 save_state
->cap
.size
= size
;
2677 pci_add_saved_cap(dev
, save_state
);
2682 int pci_add_cap_save_buffer(struct pci_dev
*dev
, char cap
, unsigned int size
)
2684 return _pci_add_cap_save_buffer(dev
, cap
, false, size
);
2687 int pci_add_ext_cap_save_buffer(struct pci_dev
*dev
, u16 cap
, unsigned int size
)
2689 return _pci_add_cap_save_buffer(dev
, cap
, true, size
);
2693 * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
2694 * @dev: the PCI device
2696 void pci_allocate_cap_save_buffers(struct pci_dev
*dev
)
2700 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_EXP
,
2701 PCI_EXP_SAVE_REGS
* sizeof(u16
));
2704 "unable to preallocate PCI Express save buffer\n");
2706 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_PCIX
, sizeof(u16
));
2709 "unable to preallocate PCI-X save buffer\n");
2711 pci_allocate_vc_save_buffers(dev
);
2714 void pci_free_cap_save_buffers(struct pci_dev
*dev
)
2716 struct pci_cap_saved_state
*tmp
;
2717 struct hlist_node
*n
;
2719 hlist_for_each_entry_safe(tmp
, n
, &dev
->saved_cap_space
, next
)
2724 * pci_configure_ari - enable or disable ARI forwarding
2725 * @dev: the PCI device
2727 * If @dev and its upstream bridge both support ARI, enable ARI in the
2728 * bridge. Otherwise, disable ARI in the bridge.
2730 void pci_configure_ari(struct pci_dev
*dev
)
2733 struct pci_dev
*bridge
;
2735 if (pcie_ari_disabled
|| !pci_is_pcie(dev
) || dev
->devfn
)
2738 bridge
= dev
->bus
->self
;
2742 pcie_capability_read_dword(bridge
, PCI_EXP_DEVCAP2
, &cap
);
2743 if (!(cap
& PCI_EXP_DEVCAP2_ARI
))
2746 if (pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
)) {
2747 pcie_capability_set_word(bridge
, PCI_EXP_DEVCTL2
,
2748 PCI_EXP_DEVCTL2_ARI
);
2749 bridge
->ari_enabled
= 1;
2751 pcie_capability_clear_word(bridge
, PCI_EXP_DEVCTL2
,
2752 PCI_EXP_DEVCTL2_ARI
);
2753 bridge
->ari_enabled
= 0;
2757 static int pci_acs_enable
;
2760 * pci_request_acs - ask for ACS to be enabled if supported
2762 void pci_request_acs(void)
2768 * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites
2769 * @dev: the PCI device
2771 static void pci_std_enable_acs(struct pci_dev
*dev
)
2777 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ACS
);
2781 pci_read_config_word(dev
, pos
+ PCI_ACS_CAP
, &cap
);
2782 pci_read_config_word(dev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2784 /* Source Validation */
2785 ctrl
|= (cap
& PCI_ACS_SV
);
2787 /* P2P Request Redirect */
2788 ctrl
|= (cap
& PCI_ACS_RR
);
2790 /* P2P Completion Redirect */
2791 ctrl
|= (cap
& PCI_ACS_CR
);
2793 /* Upstream Forwarding */
2794 ctrl
|= (cap
& PCI_ACS_UF
);
2796 pci_write_config_word(dev
, pos
+ PCI_ACS_CTRL
, ctrl
);
2800 * pci_enable_acs - enable ACS if hardware support it
2801 * @dev: the PCI device
2803 void pci_enable_acs(struct pci_dev
*dev
)
2805 if (!pci_acs_enable
)
2808 if (!pci_dev_specific_enable_acs(dev
))
2811 pci_std_enable_acs(dev
);
2814 static bool pci_acs_flags_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2819 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_ACS
);
2824 * Except for egress control, capabilities are either required
2825 * or only required if controllable. Features missing from the
2826 * capability field can therefore be assumed as hard-wired enabled.
2828 pci_read_config_word(pdev
, pos
+ PCI_ACS_CAP
, &cap
);
2829 acs_flags
&= (cap
| PCI_ACS_EC
);
2831 pci_read_config_word(pdev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2832 return (ctrl
& acs_flags
) == acs_flags
;
2836 * pci_acs_enabled - test ACS against required flags for a given device
2837 * @pdev: device to test
2838 * @acs_flags: required PCI ACS flags
2840 * Return true if the device supports the provided flags. Automatically
2841 * filters out flags that are not implemented on multifunction devices.
2843 * Note that this interface checks the effective ACS capabilities of the
2844 * device rather than the actual capabilities. For instance, most single
2845 * function endpoints are not required to support ACS because they have no
2846 * opportunity for peer-to-peer access. We therefore return 'true'
2847 * regardless of whether the device exposes an ACS capability. This makes
2848 * it much easier for callers of this function to ignore the actual type
2849 * or topology of the device when testing ACS support.
2851 bool pci_acs_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2855 ret
= pci_dev_specific_acs_enabled(pdev
, acs_flags
);
2860 * Conventional PCI and PCI-X devices never support ACS, either
2861 * effectively or actually. The shared bus topology implies that
2862 * any device on the bus can receive or snoop DMA.
2864 if (!pci_is_pcie(pdev
))
2867 switch (pci_pcie_type(pdev
)) {
2869 * PCI/X-to-PCIe bridges are not specifically mentioned by the spec,
2870 * but since their primary interface is PCI/X, we conservatively
2871 * handle them as we would a non-PCIe device.
2873 case PCI_EXP_TYPE_PCIE_BRIDGE
:
2875 * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never
2876 * applicable... must never implement an ACS Extended Capability...".
2877 * This seems arbitrary, but we take a conservative interpretation
2878 * of this statement.
2880 case PCI_EXP_TYPE_PCI_BRIDGE
:
2881 case PCI_EXP_TYPE_RC_EC
:
2884 * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should
2885 * implement ACS in order to indicate their peer-to-peer capabilities,
2886 * regardless of whether they are single- or multi-function devices.
2888 case PCI_EXP_TYPE_DOWNSTREAM
:
2889 case PCI_EXP_TYPE_ROOT_PORT
:
2890 return pci_acs_flags_enabled(pdev
, acs_flags
);
2892 * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be
2893 * implemented by the remaining PCIe types to indicate peer-to-peer
2894 * capabilities, but only when they are part of a multifunction
2895 * device. The footnote for section 6.12 indicates the specific
2896 * PCIe types included here.
2898 case PCI_EXP_TYPE_ENDPOINT
:
2899 case PCI_EXP_TYPE_UPSTREAM
:
2900 case PCI_EXP_TYPE_LEG_END
:
2901 case PCI_EXP_TYPE_RC_END
:
2902 if (!pdev
->multifunction
)
2905 return pci_acs_flags_enabled(pdev
, acs_flags
);
2909 * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable
2910 * to single function devices with the exception of downstream ports.
2916 * pci_acs_path_enable - test ACS flags from start to end in a hierarchy
2917 * @start: starting downstream device
2918 * @end: ending upstream device or NULL to search to the root bus
2919 * @acs_flags: required flags
2921 * Walk up a device tree from start to end testing PCI ACS support. If
2922 * any step along the way does not support the required flags, return false.
2924 bool pci_acs_path_enabled(struct pci_dev
*start
,
2925 struct pci_dev
*end
, u16 acs_flags
)
2927 struct pci_dev
*pdev
, *parent
= start
;
2932 if (!pci_acs_enabled(pdev
, acs_flags
))
2935 if (pci_is_root_bus(pdev
->bus
))
2936 return (end
== NULL
);
2938 parent
= pdev
->bus
->self
;
2939 } while (pdev
!= end
);
2945 * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
2946 * @dev: the PCI device
2947 * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
2949 * Perform INTx swizzling for a device behind one level of bridge. This is
2950 * required by section 9.1 of the PCI-to-PCI bridge specification for devices
2951 * behind bridges on add-in cards. For devices with ARI enabled, the slot
2952 * number is always 0 (see the Implementation Note in section 2.2.8.1 of
2953 * the PCI Express Base Specification, Revision 2.1)
2955 u8
pci_swizzle_interrupt_pin(const struct pci_dev
*dev
, u8 pin
)
2959 if (pci_ari_enabled(dev
->bus
))
2962 slot
= PCI_SLOT(dev
->devfn
);
2964 return (((pin
- 1) + slot
) % 4) + 1;
2967 int pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
2975 while (!pci_is_root_bus(dev
->bus
)) {
2976 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2977 dev
= dev
->bus
->self
;
2984 * pci_common_swizzle - swizzle INTx all the way to root bridge
2985 * @dev: the PCI device
2986 * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
2988 * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
2989 * bridges all the way up to a PCI root bus.
2991 u8
pci_common_swizzle(struct pci_dev
*dev
, u8
*pinp
)
2995 while (!pci_is_root_bus(dev
->bus
)) {
2996 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2997 dev
= dev
->bus
->self
;
3000 return PCI_SLOT(dev
->devfn
);
3002 EXPORT_SYMBOL_GPL(pci_common_swizzle
);
3005 * pci_release_region - Release a PCI bar
3006 * @pdev: PCI device whose resources were previously reserved by pci_request_region
3007 * @bar: BAR to release
3009 * Releases the PCI I/O and memory resources previously reserved by a
3010 * successful call to pci_request_region. Call this function only
3011 * after all use of the PCI regions has ceased.
3013 void pci_release_region(struct pci_dev
*pdev
, int bar
)
3015 struct pci_devres
*dr
;
3017 if (pci_resource_len(pdev
, bar
) == 0)
3019 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
3020 release_region(pci_resource_start(pdev
, bar
),
3021 pci_resource_len(pdev
, bar
));
3022 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
3023 release_mem_region(pci_resource_start(pdev
, bar
),
3024 pci_resource_len(pdev
, bar
));
3026 dr
= find_pci_dr(pdev
);
3028 dr
->region_mask
&= ~(1 << bar
);
3030 EXPORT_SYMBOL(pci_release_region
);
3033 * __pci_request_region - Reserved PCI I/O and memory resource
3034 * @pdev: PCI device whose resources are to be reserved
3035 * @bar: BAR to be reserved
3036 * @res_name: Name to be associated with resource.
3037 * @exclusive: whether the region access is exclusive or not
3039 * Mark the PCI region associated with PCI device @pdev BR @bar as
3040 * being reserved by owner @res_name. Do not access any
3041 * address inside the PCI regions unless this call returns
3044 * If @exclusive is set, then the region is marked so that userspace
3045 * is explicitly not allowed to map the resource via /dev/mem or
3046 * sysfs MMIO access.
3048 * Returns 0 on success, or %EBUSY on error. A warning
3049 * message is also printed on failure.
3051 static int __pci_request_region(struct pci_dev
*pdev
, int bar
,
3052 const char *res_name
, int exclusive
)
3054 struct pci_devres
*dr
;
3056 if (pci_resource_len(pdev
, bar
) == 0)
3059 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
3060 if (!request_region(pci_resource_start(pdev
, bar
),
3061 pci_resource_len(pdev
, bar
), res_name
))
3063 } else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
3064 if (!__request_mem_region(pci_resource_start(pdev
, bar
),
3065 pci_resource_len(pdev
, bar
), res_name
,
3070 dr
= find_pci_dr(pdev
);
3072 dr
->region_mask
|= 1 << bar
;
3077 dev_warn(&pdev
->dev
, "BAR %d: can't reserve %pR\n", bar
,
3078 &pdev
->resource
[bar
]);
3083 * pci_request_region - Reserve PCI I/O and memory resource
3084 * @pdev: PCI device whose resources are to be reserved
3085 * @bar: BAR to be reserved
3086 * @res_name: Name to be associated with resource
3088 * Mark the PCI region associated with PCI device @pdev BAR @bar as
3089 * being reserved by owner @res_name. Do not access any
3090 * address inside the PCI regions unless this call returns
3093 * Returns 0 on success, or %EBUSY on error. A warning
3094 * message is also printed on failure.
3096 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
3098 return __pci_request_region(pdev
, bar
, res_name
, 0);
3100 EXPORT_SYMBOL(pci_request_region
);
3103 * pci_request_region_exclusive - Reserved PCI I/O and memory resource
3104 * @pdev: PCI device whose resources are to be reserved
3105 * @bar: BAR to be reserved
3106 * @res_name: Name to be associated with resource.
3108 * Mark the PCI region associated with PCI device @pdev BR @bar as
3109 * being reserved by owner @res_name. Do not access any
3110 * address inside the PCI regions unless this call returns
3113 * Returns 0 on success, or %EBUSY on error. A warning
3114 * message is also printed on failure.
3116 * The key difference that _exclusive makes it that userspace is
3117 * explicitly not allowed to map the resource via /dev/mem or
3120 int pci_request_region_exclusive(struct pci_dev
*pdev
, int bar
,
3121 const char *res_name
)
3123 return __pci_request_region(pdev
, bar
, res_name
, IORESOURCE_EXCLUSIVE
);
3125 EXPORT_SYMBOL(pci_request_region_exclusive
);
3128 * pci_release_selected_regions - Release selected PCI I/O and memory resources
3129 * @pdev: PCI device whose resources were previously reserved
3130 * @bars: Bitmask of BARs to be released
3132 * Release selected PCI I/O and memory resources previously reserved.
3133 * Call this function only after all use of the PCI regions has ceased.
3135 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
3139 for (i
= 0; i
< 6; i
++)
3140 if (bars
& (1 << i
))
3141 pci_release_region(pdev
, i
);
3143 EXPORT_SYMBOL(pci_release_selected_regions
);
3145 static int __pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3146 const char *res_name
, int excl
)
3150 for (i
= 0; i
< 6; i
++)
3151 if (bars
& (1 << i
))
3152 if (__pci_request_region(pdev
, i
, res_name
, excl
))
3158 if (bars
& (1 << i
))
3159 pci_release_region(pdev
, i
);
3166 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
3167 * @pdev: PCI device whose resources are to be reserved
3168 * @bars: Bitmask of BARs to be requested
3169 * @res_name: Name to be associated with resource
3171 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3172 const char *res_name
)
3174 return __pci_request_selected_regions(pdev
, bars
, res_name
, 0);
3176 EXPORT_SYMBOL(pci_request_selected_regions
);
3178 int pci_request_selected_regions_exclusive(struct pci_dev
*pdev
, int bars
,
3179 const char *res_name
)
3181 return __pci_request_selected_regions(pdev
, bars
, res_name
,
3182 IORESOURCE_EXCLUSIVE
);
3184 EXPORT_SYMBOL(pci_request_selected_regions_exclusive
);
3187 * pci_release_regions - Release reserved PCI I/O and memory resources
3188 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
3190 * Releases all PCI I/O and memory resources previously reserved by a
3191 * successful call to pci_request_regions. Call this function only
3192 * after all use of the PCI regions has ceased.
3195 void pci_release_regions(struct pci_dev
*pdev
)
3197 pci_release_selected_regions(pdev
, (1 << 6) - 1);
3199 EXPORT_SYMBOL(pci_release_regions
);
3202 * pci_request_regions - Reserved PCI I/O and memory resources
3203 * @pdev: PCI device whose resources are to be reserved
3204 * @res_name: Name to be associated with resource.
3206 * Mark all PCI regions associated with PCI device @pdev as
3207 * being reserved by owner @res_name. Do not access any
3208 * address inside the PCI regions unless this call returns
3211 * Returns 0 on success, or %EBUSY on error. A warning
3212 * message is also printed on failure.
3214 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
3216 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
3218 EXPORT_SYMBOL(pci_request_regions
);
3221 * pci_request_regions_exclusive - Reserved PCI I/O and memory resources
3222 * @pdev: PCI device whose resources are to be reserved
3223 * @res_name: Name to be associated with resource.
3225 * Mark all PCI regions associated with PCI device @pdev as
3226 * being reserved by owner @res_name. Do not access any
3227 * address inside the PCI regions unless this call returns
3230 * pci_request_regions_exclusive() will mark the region so that
3231 * /dev/mem and the sysfs MMIO access will not be allowed.
3233 * Returns 0 on success, or %EBUSY on error. A warning
3234 * message is also printed on failure.
3236 int pci_request_regions_exclusive(struct pci_dev
*pdev
, const char *res_name
)
3238 return pci_request_selected_regions_exclusive(pdev
,
3239 ((1 << 6) - 1), res_name
);
3241 EXPORT_SYMBOL(pci_request_regions_exclusive
);
3245 struct list_head list
;
3247 resource_size_t size
;
3250 static LIST_HEAD(io_range_list
);
3251 static DEFINE_SPINLOCK(io_range_lock
);
3255 * Record the PCI IO range (expressed as CPU physical address + size).
3256 * Return a negative value if an error has occured, zero otherwise
3258 int __weak
pci_register_io_range(phys_addr_t addr
, resource_size_t size
)
3263 struct io_range
*range
;
3264 resource_size_t allocated_size
= 0;
3266 /* check if the range hasn't been previously recorded */
3267 spin_lock(&io_range_lock
);
3268 list_for_each_entry(range
, &io_range_list
, list
) {
3269 if (addr
>= range
->start
&& addr
+ size
<= range
->start
+ size
) {
3270 /* range already registered, bail out */
3273 allocated_size
+= range
->size
;
3276 /* range not registed yet, check for available space */
3277 if (allocated_size
+ size
- 1 > IO_SPACE_LIMIT
) {
3278 /* if it's too big check if 64K space can be reserved */
3279 if (allocated_size
+ SZ_64K
- 1 > IO_SPACE_LIMIT
) {
3285 pr_warn("Requested IO range too big, new size set to 64K\n");
3288 /* add the range to the list */
3289 range
= kzalloc(sizeof(*range
), GFP_ATOMIC
);
3295 range
->start
= addr
;
3298 list_add_tail(&range
->list
, &io_range_list
);
3301 spin_unlock(&io_range_lock
);
3307 phys_addr_t
pci_pio_to_address(unsigned long pio
)
3309 phys_addr_t address
= (phys_addr_t
)OF_BAD_ADDR
;
3312 struct io_range
*range
;
3313 resource_size_t allocated_size
= 0;
3315 if (pio
> IO_SPACE_LIMIT
)
3318 spin_lock(&io_range_lock
);
3319 list_for_each_entry(range
, &io_range_list
, list
) {
3320 if (pio
>= allocated_size
&& pio
< allocated_size
+ range
->size
) {
3321 address
= range
->start
+ pio
- allocated_size
;
3324 allocated_size
+= range
->size
;
3326 spin_unlock(&io_range_lock
);
3332 unsigned long __weak
pci_address_to_pio(phys_addr_t address
)
3335 struct io_range
*res
;
3336 resource_size_t offset
= 0;
3337 unsigned long addr
= -1;
3339 spin_lock(&io_range_lock
);
3340 list_for_each_entry(res
, &io_range_list
, list
) {
3341 if (address
>= res
->start
&& address
< res
->start
+ res
->size
) {
3342 addr
= address
- res
->start
+ offset
;
3345 offset
+= res
->size
;
3347 spin_unlock(&io_range_lock
);
3351 if (address
> IO_SPACE_LIMIT
)
3352 return (unsigned long)-1;
3354 return (unsigned long) address
;
3359 * pci_remap_iospace - Remap the memory mapped I/O space
3360 * @res: Resource describing the I/O space
3361 * @phys_addr: physical address of range to be mapped
3363 * Remap the memory mapped I/O space described by the @res
3364 * and the CPU physical address @phys_addr into virtual address space.
3365 * Only architectures that have memory mapped IO functions defined
3366 * (and the PCI_IOBASE value defined) should call this function.
3368 int __weak
pci_remap_iospace(const struct resource
*res
, phys_addr_t phys_addr
)
3370 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3371 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3373 if (!(res
->flags
& IORESOURCE_IO
))
3376 if (res
->end
> IO_SPACE_LIMIT
)
3379 return ioremap_page_range(vaddr
, vaddr
+ resource_size(res
), phys_addr
,
3380 pgprot_device(PAGE_KERNEL
));
3382 /* this architecture does not have memory mapped I/O space,
3383 so this function should never be called */
3384 WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
3390 * pci_unmap_iospace - Unmap the memory mapped I/O space
3391 * @res: resource to be unmapped
3393 * Unmap the CPU virtual address @res from virtual address space.
3394 * Only architectures that have memory mapped IO functions defined
3395 * (and the PCI_IOBASE value defined) should call this function.
3397 void pci_unmap_iospace(struct resource
*res
)
3399 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3400 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3402 unmap_kernel_range(vaddr
, resource_size(res
));
3406 static void __pci_set_master(struct pci_dev
*dev
, bool enable
)
3410 pci_read_config_word(dev
, PCI_COMMAND
, &old_cmd
);
3412 cmd
= old_cmd
| PCI_COMMAND_MASTER
;
3414 cmd
= old_cmd
& ~PCI_COMMAND_MASTER
;
3415 if (cmd
!= old_cmd
) {
3416 dev_dbg(&dev
->dev
, "%s bus mastering\n",
3417 enable
? "enabling" : "disabling");
3418 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3420 dev
->is_busmaster
= enable
;
3424 * pcibios_setup - process "pci=" kernel boot arguments
3425 * @str: string used to pass in "pci=" kernel boot arguments
3427 * Process kernel boot arguments. This is the default implementation.
3428 * Architecture specific implementations can override this as necessary.
3430 char * __weak __init
pcibios_setup(char *str
)
3436 * pcibios_set_master - enable PCI bus-mastering for device dev
3437 * @dev: the PCI device to enable
3439 * Enables PCI bus-mastering for the device. This is the default
3440 * implementation. Architecture specific implementations can override
3441 * this if necessary.
3443 void __weak
pcibios_set_master(struct pci_dev
*dev
)
3447 /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
3448 if (pci_is_pcie(dev
))
3451 pci_read_config_byte(dev
, PCI_LATENCY_TIMER
, &lat
);
3453 lat
= (64 <= pcibios_max_latency
) ? 64 : pcibios_max_latency
;
3454 else if (lat
> pcibios_max_latency
)
3455 lat
= pcibios_max_latency
;
3459 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, lat
);
3463 * pci_set_master - enables bus-mastering for device dev
3464 * @dev: the PCI device to enable
3466 * Enables bus-mastering on the device and calls pcibios_set_master()
3467 * to do the needed arch specific settings.
3469 void pci_set_master(struct pci_dev
*dev
)
3471 __pci_set_master(dev
, true);
3472 pcibios_set_master(dev
);
3474 EXPORT_SYMBOL(pci_set_master
);
3477 * pci_clear_master - disables bus-mastering for device dev
3478 * @dev: the PCI device to disable
3480 void pci_clear_master(struct pci_dev
*dev
)
3482 __pci_set_master(dev
, false);
3484 EXPORT_SYMBOL(pci_clear_master
);
3487 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
3488 * @dev: the PCI device for which MWI is to be enabled
3490 * Helper function for pci_set_mwi.
3491 * Originally copied from drivers/net/acenic.c.
3492 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
3494 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3496 int pci_set_cacheline_size(struct pci_dev
*dev
)
3500 if (!pci_cache_line_size
)
3503 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
3504 equal to or multiple of the right value. */
3505 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3506 if (cacheline_size
>= pci_cache_line_size
&&
3507 (cacheline_size
% pci_cache_line_size
) == 0)
3510 /* Write the correct value. */
3511 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
3513 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3514 if (cacheline_size
== pci_cache_line_size
)
3517 dev_printk(KERN_DEBUG
, &dev
->dev
, "cache line size of %d is not supported\n",
3518 pci_cache_line_size
<< 2);
3522 EXPORT_SYMBOL_GPL(pci_set_cacheline_size
);
3525 * pci_set_mwi - enables memory-write-invalidate PCI transaction
3526 * @dev: the PCI device for which MWI is enabled
3528 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3530 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3532 int pci_set_mwi(struct pci_dev
*dev
)
3534 #ifdef PCI_DISABLE_MWI
3540 rc
= pci_set_cacheline_size(dev
);
3544 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3545 if (!(cmd
& PCI_COMMAND_INVALIDATE
)) {
3546 dev_dbg(&dev
->dev
, "enabling Mem-Wr-Inval\n");
3547 cmd
|= PCI_COMMAND_INVALIDATE
;
3548 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3553 EXPORT_SYMBOL(pci_set_mwi
);
3556 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
3557 * @dev: the PCI device for which MWI is enabled
3559 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3560 * Callers are not required to check the return value.
3562 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3564 int pci_try_set_mwi(struct pci_dev
*dev
)
3566 #ifdef PCI_DISABLE_MWI
3569 return pci_set_mwi(dev
);
3572 EXPORT_SYMBOL(pci_try_set_mwi
);
3575 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
3576 * @dev: the PCI device to disable
3578 * Disables PCI Memory-Write-Invalidate transaction on the device
3580 void pci_clear_mwi(struct pci_dev
*dev
)
3582 #ifndef PCI_DISABLE_MWI
3585 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3586 if (cmd
& PCI_COMMAND_INVALIDATE
) {
3587 cmd
&= ~PCI_COMMAND_INVALIDATE
;
3588 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3592 EXPORT_SYMBOL(pci_clear_mwi
);
3595 * pci_intx - enables/disables PCI INTx for device dev
3596 * @pdev: the PCI device to operate on
3597 * @enable: boolean: whether to enable or disable PCI INTx
3599 * Enables/disables PCI INTx for device dev
3601 void pci_intx(struct pci_dev
*pdev
, int enable
)
3603 u16 pci_command
, new;
3605 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
3608 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
3610 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
3612 if (new != pci_command
) {
3613 struct pci_devres
*dr
;
3615 pci_write_config_word(pdev
, PCI_COMMAND
, new);
3617 dr
= find_pci_dr(pdev
);
3618 if (dr
&& !dr
->restore_intx
) {
3619 dr
->restore_intx
= 1;
3620 dr
->orig_intx
= !enable
;
3624 EXPORT_SYMBOL_GPL(pci_intx
);
3627 * pci_intx_mask_supported - probe for INTx masking support
3628 * @dev: the PCI device to operate on
3630 * Check if the device dev support INTx masking via the config space
3633 bool pci_intx_mask_supported(struct pci_dev
*dev
)
3635 bool mask_supported
= false;
3638 if (dev
->broken_intx_masking
)
3641 pci_cfg_access_lock(dev
);
3643 pci_read_config_word(dev
, PCI_COMMAND
, &orig
);
3644 pci_write_config_word(dev
, PCI_COMMAND
,
3645 orig
^ PCI_COMMAND_INTX_DISABLE
);
3646 pci_read_config_word(dev
, PCI_COMMAND
, &new);
3649 * There's no way to protect against hardware bugs or detect them
3650 * reliably, but as long as we know what the value should be, let's
3651 * go ahead and check it.
3653 if ((new ^ orig
) & ~PCI_COMMAND_INTX_DISABLE
) {
3654 dev_err(&dev
->dev
, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n",
3656 } else if ((new ^ orig
) & PCI_COMMAND_INTX_DISABLE
) {
3657 mask_supported
= true;
3658 pci_write_config_word(dev
, PCI_COMMAND
, orig
);
3661 pci_cfg_access_unlock(dev
);
3662 return mask_supported
;
3664 EXPORT_SYMBOL_GPL(pci_intx_mask_supported
);
3666 static bool pci_check_and_set_intx_mask(struct pci_dev
*dev
, bool mask
)
3668 struct pci_bus
*bus
= dev
->bus
;
3669 bool mask_updated
= true;
3670 u32 cmd_status_dword
;
3671 u16 origcmd
, newcmd
;
3672 unsigned long flags
;
3676 * We do a single dword read to retrieve both command and status.
3677 * Document assumptions that make this possible.
3679 BUILD_BUG_ON(PCI_COMMAND
% 4);
3680 BUILD_BUG_ON(PCI_COMMAND
+ 2 != PCI_STATUS
);
3682 raw_spin_lock_irqsave(&pci_lock
, flags
);
3684 bus
->ops
->read(bus
, dev
->devfn
, PCI_COMMAND
, 4, &cmd_status_dword
);
3686 irq_pending
= (cmd_status_dword
>> 16) & PCI_STATUS_INTERRUPT
;
3689 * Check interrupt status register to see whether our device
3690 * triggered the interrupt (when masking) or the next IRQ is
3691 * already pending (when unmasking).
3693 if (mask
!= irq_pending
) {
3694 mask_updated
= false;
3698 origcmd
= cmd_status_dword
;
3699 newcmd
= origcmd
& ~PCI_COMMAND_INTX_DISABLE
;
3701 newcmd
|= PCI_COMMAND_INTX_DISABLE
;
3702 if (newcmd
!= origcmd
)
3703 bus
->ops
->write(bus
, dev
->devfn
, PCI_COMMAND
, 2, newcmd
);
3706 raw_spin_unlock_irqrestore(&pci_lock
, flags
);
3708 return mask_updated
;
3712 * pci_check_and_mask_intx - mask INTx on pending interrupt
3713 * @dev: the PCI device to operate on
3715 * Check if the device dev has its INTx line asserted, mask it and
3716 * return true in that case. False is returned if not interrupt was
3719 bool pci_check_and_mask_intx(struct pci_dev
*dev
)
3721 return pci_check_and_set_intx_mask(dev
, true);
3723 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx
);
3726 * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
3727 * @dev: the PCI device to operate on
3729 * Check if the device dev has its INTx line asserted, unmask it if not
3730 * and return true. False is returned and the mask remains active if
3731 * there was still an interrupt pending.
3733 bool pci_check_and_unmask_intx(struct pci_dev
*dev
)
3735 return pci_check_and_set_intx_mask(dev
, false);
3737 EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx
);
3740 * pci_wait_for_pending_transaction - waits for pending transaction
3741 * @dev: the PCI device to operate on
3743 * Return 0 if transaction is pending 1 otherwise.
3745 int pci_wait_for_pending_transaction(struct pci_dev
*dev
)
3747 if (!pci_is_pcie(dev
))
3750 return pci_wait_for_pending(dev
, pci_pcie_cap(dev
) + PCI_EXP_DEVSTA
,
3751 PCI_EXP_DEVSTA_TRPND
);
3753 EXPORT_SYMBOL(pci_wait_for_pending_transaction
);
3756 * We should only need to wait 100ms after FLR, but some devices take longer.
3757 * Wait for up to 1000ms for config space to return something other than -1.
3758 * Intel IGD requires this when an LCD panel is attached. We read the 2nd
3759 * dword because VFs don't implement the 1st dword.
3761 static void pci_flr_wait(struct pci_dev
*dev
)
3768 pci_read_config_dword(dev
, PCI_COMMAND
, &id
);
3769 } while (i
++ < 10 && id
== ~0);
3772 dev_warn(&dev
->dev
, "Failed to return from FLR\n");
3774 dev_info(&dev
->dev
, "Required additional %dms to return from FLR\n",
3778 static int pcie_flr(struct pci_dev
*dev
, int probe
)
3782 pcie_capability_read_dword(dev
, PCI_EXP_DEVCAP
, &cap
);
3783 if (!(cap
& PCI_EXP_DEVCAP_FLR
))
3789 if (!pci_wait_for_pending_transaction(dev
))
3790 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing function level reset anyway\n");
3792 pcie_capability_set_word(dev
, PCI_EXP_DEVCTL
, PCI_EXP_DEVCTL_BCR_FLR
);
3797 static int pci_af_flr(struct pci_dev
*dev
, int probe
)
3802 pos
= pci_find_capability(dev
, PCI_CAP_ID_AF
);
3806 pci_read_config_byte(dev
, pos
+ PCI_AF_CAP
, &cap
);
3807 if (!(cap
& PCI_AF_CAP_TP
) || !(cap
& PCI_AF_CAP_FLR
))
3814 * Wait for Transaction Pending bit to clear. A word-aligned test
3815 * is used, so we use the conrol offset rather than status and shift
3816 * the test bit to match.
3818 if (!pci_wait_for_pending(dev
, pos
+ PCI_AF_CTRL
,
3819 PCI_AF_STATUS_TP
<< 8))
3820 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
3822 pci_write_config_byte(dev
, pos
+ PCI_AF_CTRL
, PCI_AF_CTRL_FLR
);
3828 * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
3829 * @dev: Device to reset.
3830 * @probe: If set, only check if the device can be reset this way.
3832 * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
3833 * unset, it will be reinitialized internally when going from PCI_D3hot to
3834 * PCI_D0. If that's the case and the device is not in a low-power state
3835 * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
3837 * NOTE: This causes the caller to sleep for twice the device power transition
3838 * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
3839 * by default (i.e. unless the @dev's d3_delay field has a different value).
3840 * Moreover, only devices in D0 can be reset by this function.
3842 static int pci_pm_reset(struct pci_dev
*dev
, int probe
)
3846 if (!dev
->pm_cap
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_PM_RESET
)
3849 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &csr
);
3850 if (csr
& PCI_PM_CTRL_NO_SOFT_RESET
)
3856 if (dev
->current_state
!= PCI_D0
)
3859 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3861 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3862 pci_dev_d3_sleep(dev
);
3864 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3866 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3867 pci_dev_d3_sleep(dev
);
3872 void pci_reset_secondary_bus(struct pci_dev
*dev
)
3876 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &ctrl
);
3877 ctrl
|= PCI_BRIDGE_CTL_BUS_RESET
;
3878 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3880 * PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double
3881 * this to 2ms to ensure that we meet the minimum requirement.
3885 ctrl
&= ~PCI_BRIDGE_CTL_BUS_RESET
;
3886 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3889 * Trhfa for conventional PCI is 2^25 clock cycles.
3890 * Assuming a minimum 33MHz clock this results in a 1s
3891 * delay before we can consider subordinate devices to
3892 * be re-initialized. PCIe has some ways to shorten this,
3893 * but we don't make use of them yet.
3898 void __weak
pcibios_reset_secondary_bus(struct pci_dev
*dev
)
3900 pci_reset_secondary_bus(dev
);
3904 * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge.
3905 * @dev: Bridge device
3907 * Use the bridge control register to assert reset on the secondary bus.
3908 * Devices on the secondary bus are left in power-on state.
3910 void pci_reset_bridge_secondary_bus(struct pci_dev
*dev
)
3912 pcibios_reset_secondary_bus(dev
);
3914 EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus
);
3916 static int pci_parent_bus_reset(struct pci_dev
*dev
, int probe
)
3918 struct pci_dev
*pdev
;
3920 if (pci_is_root_bus(dev
->bus
) || dev
->subordinate
||
3921 !dev
->bus
->self
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
3924 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
3931 pci_reset_bridge_secondary_bus(dev
->bus
->self
);
3936 static int pci_reset_hotplug_slot(struct hotplug_slot
*hotplug
, int probe
)
3940 if (!hotplug
|| !try_module_get(hotplug
->ops
->owner
))
3943 if (hotplug
->ops
->reset_slot
)
3944 rc
= hotplug
->ops
->reset_slot(hotplug
, probe
);
3946 module_put(hotplug
->ops
->owner
);
3951 static int pci_dev_reset_slot_function(struct pci_dev
*dev
, int probe
)
3953 struct pci_dev
*pdev
;
3955 if (dev
->subordinate
|| !dev
->slot
||
3956 dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
3959 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
3960 if (pdev
!= dev
&& pdev
->slot
== dev
->slot
)
3963 return pci_reset_hotplug_slot(dev
->slot
->hotplug
, probe
);
3966 static int __pci_dev_reset(struct pci_dev
*dev
, int probe
)
3972 rc
= pci_dev_specific_reset(dev
, probe
);
3976 rc
= pcie_flr(dev
, probe
);
3980 rc
= pci_af_flr(dev
, probe
);
3984 rc
= pci_pm_reset(dev
, probe
);
3988 rc
= pci_dev_reset_slot_function(dev
, probe
);
3992 rc
= pci_parent_bus_reset(dev
, probe
);
3997 static void pci_dev_lock(struct pci_dev
*dev
)
3999 pci_cfg_access_lock(dev
);
4000 /* block PM suspend, driver probe, etc. */
4001 device_lock(&dev
->dev
);
4004 /* Return 1 on successful lock, 0 on contention */
4005 static int pci_dev_trylock(struct pci_dev
*dev
)
4007 if (pci_cfg_access_trylock(dev
)) {
4008 if (device_trylock(&dev
->dev
))
4010 pci_cfg_access_unlock(dev
);
4016 static void pci_dev_unlock(struct pci_dev
*dev
)
4018 device_unlock(&dev
->dev
);
4019 pci_cfg_access_unlock(dev
);
4023 * pci_reset_notify - notify device driver of reset
4024 * @dev: device to be notified of reset
4025 * @prepare: 'true' if device is about to be reset; 'false' if reset attempt
4028 * Must be called prior to device access being disabled and after device
4029 * access is restored.
4031 static void pci_reset_notify(struct pci_dev
*dev
, bool prepare
)
4033 const struct pci_error_handlers
*err_handler
=
4034 dev
->driver
? dev
->driver
->err_handler
: NULL
;
4035 if (err_handler
&& err_handler
->reset_notify
)
4036 err_handler
->reset_notify(dev
, prepare
);
4039 static void pci_dev_save_and_disable(struct pci_dev
*dev
)
4041 pci_reset_notify(dev
, true);
4044 * Wake-up device prior to save. PM registers default to D0 after
4045 * reset and a simple register restore doesn't reliably return
4046 * to a non-D0 state anyway.
4048 pci_set_power_state(dev
, PCI_D0
);
4050 pci_save_state(dev
);
4052 * Disable the device by clearing the Command register, except for
4053 * INTx-disable which is set. This not only disables MMIO and I/O port
4054 * BARs, but also prevents the device from being Bus Master, preventing
4055 * DMA from the device including MSI/MSI-X interrupts. For PCI 2.3
4056 * compliant devices, INTx-disable prevents legacy interrupts.
4058 pci_write_config_word(dev
, PCI_COMMAND
, PCI_COMMAND_INTX_DISABLE
);
4061 static void pci_dev_restore(struct pci_dev
*dev
)
4063 pci_restore_state(dev
);
4064 pci_reset_notify(dev
, false);
4067 static int pci_dev_reset(struct pci_dev
*dev
, int probe
)
4074 rc
= __pci_dev_reset(dev
, probe
);
4077 pci_dev_unlock(dev
);
4083 * __pci_reset_function - reset a PCI device function
4084 * @dev: PCI device to reset
4086 * Some devices allow an individual function to be reset without affecting
4087 * other functions in the same device. The PCI device must be responsive
4088 * to PCI config space in order to use this function.
4090 * The device function is presumed to be unused when this function is called.
4091 * Resetting the device will make the contents of PCI configuration space
4092 * random, so any caller of this must be prepared to reinitialise the
4093 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
4096 * Returns 0 if the device function was successfully reset or negative if the
4097 * device doesn't support resetting a single function.
4099 int __pci_reset_function(struct pci_dev
*dev
)
4101 return pci_dev_reset(dev
, 0);
4103 EXPORT_SYMBOL_GPL(__pci_reset_function
);
4106 * __pci_reset_function_locked - reset a PCI device function while holding
4107 * the @dev mutex lock.
4108 * @dev: PCI device to reset
4110 * Some devices allow an individual function to be reset without affecting
4111 * other functions in the same device. The PCI device must be responsive
4112 * to PCI config space in order to use this function.
4114 * The device function is presumed to be unused and the caller is holding
4115 * the device mutex lock when this function is called.
4116 * Resetting the device will make the contents of PCI configuration space
4117 * random, so any caller of this must be prepared to reinitialise the
4118 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
4121 * Returns 0 if the device function was successfully reset or negative if the
4122 * device doesn't support resetting a single function.
4124 int __pci_reset_function_locked(struct pci_dev
*dev
)
4126 return __pci_dev_reset(dev
, 0);
4128 EXPORT_SYMBOL_GPL(__pci_reset_function_locked
);
4131 * pci_probe_reset_function - check whether the device can be safely reset
4132 * @dev: PCI device to reset
4134 * Some devices allow an individual function to be reset without affecting
4135 * other functions in the same device. The PCI device must be responsive
4136 * to PCI config space in order to use this function.
4138 * Returns 0 if the device function can be reset or negative if the
4139 * device doesn't support resetting a single function.
4141 int pci_probe_reset_function(struct pci_dev
*dev
)
4143 return pci_dev_reset(dev
, 1);
4147 * pci_reset_function - quiesce and reset a PCI device function
4148 * @dev: PCI device to reset
4150 * Some devices allow an individual function to be reset without affecting
4151 * other functions in the same device. The PCI device must be responsive
4152 * to PCI config space in order to use this function.
4154 * This function does not just reset the PCI portion of a device, but
4155 * clears all the state associated with the device. This function differs
4156 * from __pci_reset_function in that it saves and restores device state
4159 * Returns 0 if the device function was successfully reset or negative if the
4160 * device doesn't support resetting a single function.
4162 int pci_reset_function(struct pci_dev
*dev
)
4166 rc
= pci_dev_reset(dev
, 1);
4170 pci_dev_save_and_disable(dev
);
4172 rc
= pci_dev_reset(dev
, 0);
4174 pci_dev_restore(dev
);
4178 EXPORT_SYMBOL_GPL(pci_reset_function
);
4181 * pci_try_reset_function - quiesce and reset a PCI device function
4182 * @dev: PCI device to reset
4184 * Same as above, except return -EAGAIN if unable to lock device.
4186 int pci_try_reset_function(struct pci_dev
*dev
)
4190 rc
= pci_dev_reset(dev
, 1);
4194 pci_dev_save_and_disable(dev
);
4196 if (pci_dev_trylock(dev
)) {
4197 rc
= __pci_dev_reset(dev
, 0);
4198 pci_dev_unlock(dev
);
4202 pci_dev_restore(dev
);
4206 EXPORT_SYMBOL_GPL(pci_try_reset_function
);
4208 /* Do any devices on or below this bus prevent a bus reset? */
4209 static bool pci_bus_resetable(struct pci_bus
*bus
)
4211 struct pci_dev
*dev
;
4213 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4214 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4215 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4222 /* Lock devices from the top of the tree down */
4223 static void pci_bus_lock(struct pci_bus
*bus
)
4225 struct pci_dev
*dev
;
4227 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4229 if (dev
->subordinate
)
4230 pci_bus_lock(dev
->subordinate
);
4234 /* Unlock devices from the bottom of the tree up */
4235 static void pci_bus_unlock(struct pci_bus
*bus
)
4237 struct pci_dev
*dev
;
4239 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4240 if (dev
->subordinate
)
4241 pci_bus_unlock(dev
->subordinate
);
4242 pci_dev_unlock(dev
);
4246 /* Return 1 on successful lock, 0 on contention */
4247 static int pci_bus_trylock(struct pci_bus
*bus
)
4249 struct pci_dev
*dev
;
4251 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4252 if (!pci_dev_trylock(dev
))
4254 if (dev
->subordinate
) {
4255 if (!pci_bus_trylock(dev
->subordinate
)) {
4256 pci_dev_unlock(dev
);
4264 list_for_each_entry_continue_reverse(dev
, &bus
->devices
, bus_list
) {
4265 if (dev
->subordinate
)
4266 pci_bus_unlock(dev
->subordinate
);
4267 pci_dev_unlock(dev
);
4272 /* Do any devices on or below this slot prevent a bus reset? */
4273 static bool pci_slot_resetable(struct pci_slot
*slot
)
4275 struct pci_dev
*dev
;
4277 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4278 if (!dev
->slot
|| dev
->slot
!= slot
)
4280 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4281 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4288 /* Lock devices from the top of the tree down */
4289 static void pci_slot_lock(struct pci_slot
*slot
)
4291 struct pci_dev
*dev
;
4293 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4294 if (!dev
->slot
|| dev
->slot
!= slot
)
4297 if (dev
->subordinate
)
4298 pci_bus_lock(dev
->subordinate
);
4302 /* Unlock devices from the bottom of the tree up */
4303 static void pci_slot_unlock(struct pci_slot
*slot
)
4305 struct pci_dev
*dev
;
4307 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4308 if (!dev
->slot
|| dev
->slot
!= slot
)
4310 if (dev
->subordinate
)
4311 pci_bus_unlock(dev
->subordinate
);
4312 pci_dev_unlock(dev
);
4316 /* Return 1 on successful lock, 0 on contention */
4317 static int pci_slot_trylock(struct pci_slot
*slot
)
4319 struct pci_dev
*dev
;
4321 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4322 if (!dev
->slot
|| dev
->slot
!= slot
)
4324 if (!pci_dev_trylock(dev
))
4326 if (dev
->subordinate
) {
4327 if (!pci_bus_trylock(dev
->subordinate
)) {
4328 pci_dev_unlock(dev
);
4336 list_for_each_entry_continue_reverse(dev
,
4337 &slot
->bus
->devices
, bus_list
) {
4338 if (!dev
->slot
|| dev
->slot
!= slot
)
4340 if (dev
->subordinate
)
4341 pci_bus_unlock(dev
->subordinate
);
4342 pci_dev_unlock(dev
);
4347 /* Save and disable devices from the top of the tree down */
4348 static void pci_bus_save_and_disable(struct pci_bus
*bus
)
4350 struct pci_dev
*dev
;
4352 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4353 pci_dev_save_and_disable(dev
);
4354 if (dev
->subordinate
)
4355 pci_bus_save_and_disable(dev
->subordinate
);
4360 * Restore devices from top of the tree down - parent bridges need to be
4361 * restored before we can get to subordinate devices.
4363 static void pci_bus_restore(struct pci_bus
*bus
)
4365 struct pci_dev
*dev
;
4367 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4368 pci_dev_restore(dev
);
4369 if (dev
->subordinate
)
4370 pci_bus_restore(dev
->subordinate
);
4374 /* Save and disable devices from the top of the tree down */
4375 static void pci_slot_save_and_disable(struct pci_slot
*slot
)
4377 struct pci_dev
*dev
;
4379 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4380 if (!dev
->slot
|| dev
->slot
!= slot
)
4382 pci_dev_save_and_disable(dev
);
4383 if (dev
->subordinate
)
4384 pci_bus_save_and_disable(dev
->subordinate
);
4389 * Restore devices from top of the tree down - parent bridges need to be
4390 * restored before we can get to subordinate devices.
4392 static void pci_slot_restore(struct pci_slot
*slot
)
4394 struct pci_dev
*dev
;
4396 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4397 if (!dev
->slot
|| dev
->slot
!= slot
)
4399 pci_dev_restore(dev
);
4400 if (dev
->subordinate
)
4401 pci_bus_restore(dev
->subordinate
);
4405 static int pci_slot_reset(struct pci_slot
*slot
, int probe
)
4409 if (!slot
|| !pci_slot_resetable(slot
))
4413 pci_slot_lock(slot
);
4417 rc
= pci_reset_hotplug_slot(slot
->hotplug
, probe
);
4420 pci_slot_unlock(slot
);
4426 * pci_probe_reset_slot - probe whether a PCI slot can be reset
4427 * @slot: PCI slot to probe
4429 * Return 0 if slot can be reset, negative if a slot reset is not supported.
4431 int pci_probe_reset_slot(struct pci_slot
*slot
)
4433 return pci_slot_reset(slot
, 1);
4435 EXPORT_SYMBOL_GPL(pci_probe_reset_slot
);
4438 * pci_reset_slot - reset a PCI slot
4439 * @slot: PCI slot to reset
4441 * A PCI bus may host multiple slots, each slot may support a reset mechanism
4442 * independent of other slots. For instance, some slots may support slot power
4443 * control. In the case of a 1:1 bus to slot architecture, this function may
4444 * wrap the bus reset to avoid spurious slot related events such as hotplug.
4445 * Generally a slot reset should be attempted before a bus reset. All of the
4446 * function of the slot and any subordinate buses behind the slot are reset
4447 * through this function. PCI config space of all devices in the slot and
4448 * behind the slot is saved before and restored after reset.
4450 * Return 0 on success, non-zero on error.
4452 int pci_reset_slot(struct pci_slot
*slot
)
4456 rc
= pci_slot_reset(slot
, 1);
4460 pci_slot_save_and_disable(slot
);
4462 rc
= pci_slot_reset(slot
, 0);
4464 pci_slot_restore(slot
);
4468 EXPORT_SYMBOL_GPL(pci_reset_slot
);
4471 * pci_try_reset_slot - Try to reset a PCI slot
4472 * @slot: PCI slot to reset
4474 * Same as above except return -EAGAIN if the slot cannot be locked
4476 int pci_try_reset_slot(struct pci_slot
*slot
)
4480 rc
= pci_slot_reset(slot
, 1);
4484 pci_slot_save_and_disable(slot
);
4486 if (pci_slot_trylock(slot
)) {
4488 rc
= pci_reset_hotplug_slot(slot
->hotplug
, 0);
4489 pci_slot_unlock(slot
);
4493 pci_slot_restore(slot
);
4497 EXPORT_SYMBOL_GPL(pci_try_reset_slot
);
4499 static int pci_bus_reset(struct pci_bus
*bus
, int probe
)
4501 if (!bus
->self
|| !pci_bus_resetable(bus
))
4511 pci_reset_bridge_secondary_bus(bus
->self
);
4513 pci_bus_unlock(bus
);
4519 * pci_probe_reset_bus - probe whether a PCI bus can be reset
4520 * @bus: PCI bus to probe
4522 * Return 0 if bus can be reset, negative if a bus reset is not supported.
4524 int pci_probe_reset_bus(struct pci_bus
*bus
)
4526 return pci_bus_reset(bus
, 1);
4528 EXPORT_SYMBOL_GPL(pci_probe_reset_bus
);
4531 * pci_reset_bus - reset a PCI bus
4532 * @bus: top level PCI bus to reset
4534 * Do a bus reset on the given bus and any subordinate buses, saving
4535 * and restoring state of all devices.
4537 * Return 0 on success, non-zero on error.
4539 int pci_reset_bus(struct pci_bus
*bus
)
4543 rc
= pci_bus_reset(bus
, 1);
4547 pci_bus_save_and_disable(bus
);
4549 rc
= pci_bus_reset(bus
, 0);
4551 pci_bus_restore(bus
);
4555 EXPORT_SYMBOL_GPL(pci_reset_bus
);
4558 * pci_try_reset_bus - Try to reset a PCI bus
4559 * @bus: top level PCI bus to reset
4561 * Same as above except return -EAGAIN if the bus cannot be locked
4563 int pci_try_reset_bus(struct pci_bus
*bus
)
4567 rc
= pci_bus_reset(bus
, 1);
4571 pci_bus_save_and_disable(bus
);
4573 if (pci_bus_trylock(bus
)) {
4575 pci_reset_bridge_secondary_bus(bus
->self
);
4576 pci_bus_unlock(bus
);
4580 pci_bus_restore(bus
);
4584 EXPORT_SYMBOL_GPL(pci_try_reset_bus
);
4587 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
4588 * @dev: PCI device to query
4590 * Returns mmrbc: maximum designed memory read count in bytes
4591 * or appropriate error value.
4593 int pcix_get_max_mmrbc(struct pci_dev
*dev
)
4598 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4602 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4605 return 512 << ((stat
& PCI_X_STATUS_MAX_READ
) >> 21);
4607 EXPORT_SYMBOL(pcix_get_max_mmrbc
);
4610 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
4611 * @dev: PCI device to query
4613 * Returns mmrbc: maximum memory read count in bytes
4614 * or appropriate error value.
4616 int pcix_get_mmrbc(struct pci_dev
*dev
)
4621 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4625 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4628 return 512 << ((cmd
& PCI_X_CMD_MAX_READ
) >> 2);
4630 EXPORT_SYMBOL(pcix_get_mmrbc
);
4633 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
4634 * @dev: PCI device to query
4635 * @mmrbc: maximum memory read count in bytes
4636 * valid values are 512, 1024, 2048, 4096
4638 * If possible sets maximum memory read byte count, some bridges have erratas
4639 * that prevent this.
4641 int pcix_set_mmrbc(struct pci_dev
*dev
, int mmrbc
)
4647 if (mmrbc
< 512 || mmrbc
> 4096 || !is_power_of_2(mmrbc
))
4650 v
= ffs(mmrbc
) - 10;
4652 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4656 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4659 if (v
> (stat
& PCI_X_STATUS_MAX_READ
) >> 21)
4662 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4665 o
= (cmd
& PCI_X_CMD_MAX_READ
) >> 2;
4667 if (v
> o
&& (dev
->bus
->bus_flags
& PCI_BUS_FLAGS_NO_MMRBC
))
4670 cmd
&= ~PCI_X_CMD_MAX_READ
;
4672 if (pci_write_config_word(dev
, cap
+ PCI_X_CMD
, cmd
))
4677 EXPORT_SYMBOL(pcix_set_mmrbc
);
4680 * pcie_get_readrq - get PCI Express read request size
4681 * @dev: PCI device to query
4683 * Returns maximum memory read request in bytes
4684 * or appropriate error value.
4686 int pcie_get_readrq(struct pci_dev
*dev
)
4690 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4692 return 128 << ((ctl
& PCI_EXP_DEVCTL_READRQ
) >> 12);
4694 EXPORT_SYMBOL(pcie_get_readrq
);
4697 * pcie_set_readrq - set PCI Express maximum memory read request
4698 * @dev: PCI device to query
4699 * @rq: maximum memory read count in bytes
4700 * valid values are 128, 256, 512, 1024, 2048, 4096
4702 * If possible sets maximum memory read request in bytes
4704 int pcie_set_readrq(struct pci_dev
*dev
, int rq
)
4708 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
4712 * If using the "performance" PCIe config, we clamp the
4713 * read rq size to the max packet size to prevent the
4714 * host bridge generating requests larger than we can
4717 if (pcie_bus_config
== PCIE_BUS_PERFORMANCE
) {
4718 int mps
= pcie_get_mps(dev
);
4724 v
= (ffs(rq
) - 8) << 12;
4726 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4727 PCI_EXP_DEVCTL_READRQ
, v
);
4729 EXPORT_SYMBOL(pcie_set_readrq
);
4732 * pcie_get_mps - get PCI Express maximum payload size
4733 * @dev: PCI device to query
4735 * Returns maximum payload size in bytes
4737 int pcie_get_mps(struct pci_dev
*dev
)
4741 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4743 return 128 << ((ctl
& PCI_EXP_DEVCTL_PAYLOAD
) >> 5);
4745 EXPORT_SYMBOL(pcie_get_mps
);
4748 * pcie_set_mps - set PCI Express maximum payload size
4749 * @dev: PCI device to query
4750 * @mps: maximum payload size in bytes
4751 * valid values are 128, 256, 512, 1024, 2048, 4096
4753 * If possible sets maximum payload size
4755 int pcie_set_mps(struct pci_dev
*dev
, int mps
)
4759 if (mps
< 128 || mps
> 4096 || !is_power_of_2(mps
))
4763 if (v
> dev
->pcie_mpss
)
4767 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4768 PCI_EXP_DEVCTL_PAYLOAD
, v
);
4770 EXPORT_SYMBOL(pcie_set_mps
);
4773 * pcie_get_minimum_link - determine minimum link settings of a PCI device
4774 * @dev: PCI device to query
4775 * @speed: storage for minimum speed
4776 * @width: storage for minimum width
4778 * This function will walk up the PCI device chain and determine the minimum
4779 * link width and speed of the device.
4781 int pcie_get_minimum_link(struct pci_dev
*dev
, enum pci_bus_speed
*speed
,
4782 enum pcie_link_width
*width
)
4786 *speed
= PCI_SPEED_UNKNOWN
;
4787 *width
= PCIE_LNK_WIDTH_UNKNOWN
;
4791 enum pci_bus_speed next_speed
;
4792 enum pcie_link_width next_width
;
4794 ret
= pcie_capability_read_word(dev
, PCI_EXP_LNKSTA
, &lnksta
);
4798 next_speed
= pcie_link_speed
[lnksta
& PCI_EXP_LNKSTA_CLS
];
4799 next_width
= (lnksta
& PCI_EXP_LNKSTA_NLW
) >>
4800 PCI_EXP_LNKSTA_NLW_SHIFT
;
4802 if (next_speed
< *speed
)
4803 *speed
= next_speed
;
4805 if (next_width
< *width
)
4806 *width
= next_width
;
4808 dev
= dev
->bus
->self
;
4813 EXPORT_SYMBOL(pcie_get_minimum_link
);
4816 * pci_select_bars - Make BAR mask from the type of resource
4817 * @dev: the PCI device for which BAR mask is made
4818 * @flags: resource type mask to be selected
4820 * This helper routine makes bar mask from the type of resource.
4822 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
4825 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
4826 if (pci_resource_flags(dev
, i
) & flags
)
4830 EXPORT_SYMBOL(pci_select_bars
);
4832 /* Some architectures require additional programming to enable VGA */
4833 static arch_set_vga_state_t arch_set_vga_state
;
4835 void __init
pci_register_set_vga_state(arch_set_vga_state_t func
)
4837 arch_set_vga_state
= func
; /* NULL disables */
4840 static int pci_set_vga_state_arch(struct pci_dev
*dev
, bool decode
,
4841 unsigned int command_bits
, u32 flags
)
4843 if (arch_set_vga_state
)
4844 return arch_set_vga_state(dev
, decode
, command_bits
,
4850 * pci_set_vga_state - set VGA decode state on device and parents if requested
4851 * @dev: the PCI device
4852 * @decode: true = enable decoding, false = disable decoding
4853 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
4854 * @flags: traverse ancestors and change bridges
4855 * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
4857 int pci_set_vga_state(struct pci_dev
*dev
, bool decode
,
4858 unsigned int command_bits
, u32 flags
)
4860 struct pci_bus
*bus
;
4861 struct pci_dev
*bridge
;
4865 WARN_ON((flags
& PCI_VGA_STATE_CHANGE_DECODES
) && (command_bits
& ~(PCI_COMMAND_IO
|PCI_COMMAND_MEMORY
)));
4867 /* ARCH specific VGA enables */
4868 rc
= pci_set_vga_state_arch(dev
, decode
, command_bits
, flags
);
4872 if (flags
& PCI_VGA_STATE_CHANGE_DECODES
) {
4873 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
4875 cmd
|= command_bits
;
4877 cmd
&= ~command_bits
;
4878 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
4881 if (!(flags
& PCI_VGA_STATE_CHANGE_BRIDGE
))
4888 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
4891 cmd
|= PCI_BRIDGE_CTL_VGA
;
4893 cmd
&= ~PCI_BRIDGE_CTL_VGA
;
4894 pci_write_config_word(bridge
, PCI_BRIDGE_CONTROL
,
4903 * pci_add_dma_alias - Add a DMA devfn alias for a device
4904 * @dev: the PCI device for which alias is added
4905 * @devfn: alias slot and function
4907 * This helper encodes 8-bit devfn as bit number in dma_alias_mask.
4908 * It should be called early, preferably as PCI fixup header quirk.
4910 void pci_add_dma_alias(struct pci_dev
*dev
, u8 devfn
)
4912 if (!dev
->dma_alias_mask
)
4913 dev
->dma_alias_mask
= kcalloc(BITS_TO_LONGS(U8_MAX
),
4914 sizeof(long), GFP_KERNEL
);
4915 if (!dev
->dma_alias_mask
) {
4916 dev_warn(&dev
->dev
, "Unable to allocate DMA alias mask\n");
4920 set_bit(devfn
, dev
->dma_alias_mask
);
4921 dev_info(&dev
->dev
, "Enabling fixed DMA alias to %02x.%d\n",
4922 PCI_SLOT(devfn
), PCI_FUNC(devfn
));
4925 bool pci_devs_are_dma_aliases(struct pci_dev
*dev1
, struct pci_dev
*dev2
)
4927 return (dev1
->dma_alias_mask
&&
4928 test_bit(dev2
->devfn
, dev1
->dma_alias_mask
)) ||
4929 (dev2
->dma_alias_mask
&&
4930 test_bit(dev1
->devfn
, dev2
->dma_alias_mask
));
4933 bool pci_device_is_present(struct pci_dev
*pdev
)
4937 return pci_bus_read_dev_vendor_id(pdev
->bus
, pdev
->devfn
, &v
, 0);
4939 EXPORT_SYMBOL_GPL(pci_device_is_present
);
4941 void pci_ignore_hotplug(struct pci_dev
*dev
)
4943 struct pci_dev
*bridge
= dev
->bus
->self
;
4945 dev
->ignore_hotplug
= 1;
4946 /* Propagate the "ignore hotplug" setting to the parent bridge. */
4948 bridge
->ignore_hotplug
= 1;
4950 EXPORT_SYMBOL_GPL(pci_ignore_hotplug
);
4952 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
4953 static char resource_alignment_param
[RESOURCE_ALIGNMENT_PARAM_SIZE
] = {0};
4954 static DEFINE_SPINLOCK(resource_alignment_lock
);
4957 * pci_specified_resource_alignment - get resource alignment specified by user.
4958 * @dev: the PCI device to get
4960 * RETURNS: Resource alignment if it is specified.
4961 * Zero if it is not specified.
4963 static resource_size_t
pci_specified_resource_alignment(struct pci_dev
*dev
)
4965 int seg
, bus
, slot
, func
, align_order
, count
;
4966 unsigned short vendor
, device
, subsystem_vendor
, subsystem_device
;
4967 resource_size_t align
= 0;
4970 spin_lock(&resource_alignment_lock
);
4971 p
= resource_alignment_param
;
4974 if (pci_has_flag(PCI_PROBE_ONLY
)) {
4975 pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n");
4981 if (sscanf(p
, "%d%n", &align_order
, &count
) == 1 &&
4987 if (strncmp(p
, "pci:", 4) == 0) {
4988 /* PCI vendor/device (subvendor/subdevice) ids are specified */
4990 if (sscanf(p
, "%hx:%hx:%hx:%hx%n",
4991 &vendor
, &device
, &subsystem_vendor
, &subsystem_device
, &count
) != 4) {
4992 if (sscanf(p
, "%hx:%hx%n", &vendor
, &device
, &count
) != 2) {
4993 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: pci:%s\n",
4997 subsystem_vendor
= subsystem_device
= 0;
5000 if ((!vendor
|| (vendor
== dev
->vendor
)) &&
5001 (!device
|| (device
== dev
->device
)) &&
5002 (!subsystem_vendor
|| (subsystem_vendor
== dev
->subsystem_vendor
)) &&
5003 (!subsystem_device
|| (subsystem_device
== dev
->subsystem_device
))) {
5004 if (align_order
== -1)
5007 align
= 1 << align_order
;
5013 if (sscanf(p
, "%x:%x:%x.%x%n",
5014 &seg
, &bus
, &slot
, &func
, &count
) != 4) {
5016 if (sscanf(p
, "%x:%x.%x%n",
5017 &bus
, &slot
, &func
, &count
) != 3) {
5018 /* Invalid format */
5019 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: %s\n",
5025 if (seg
== pci_domain_nr(dev
->bus
) &&
5026 bus
== dev
->bus
->number
&&
5027 slot
== PCI_SLOT(dev
->devfn
) &&
5028 func
== PCI_FUNC(dev
->devfn
)) {
5029 if (align_order
== -1)
5032 align
= 1 << align_order
;
5037 if (*p
!= ';' && *p
!= ',') {
5038 /* End of param or invalid format */
5044 spin_unlock(&resource_alignment_lock
);
5049 * This function disables memory decoding and releases memory resources
5050 * of the device specified by kernel's boot parameter 'pci=resource_alignment='.
5051 * It also rounds up size to specified alignment.
5052 * Later on, the kernel will assign page-aligned memory resource back
5055 void pci_reassigndev_resource_alignment(struct pci_dev
*dev
)
5059 resource_size_t align
, size
;
5063 * VF BARs are read-only zero according to SR-IOV spec r1.1, sec
5064 * 3.4.1.11. Their resources are allocated from the space
5065 * described by the VF BARx register in the PF's SR-IOV capability.
5066 * We can't influence their alignment here.
5071 /* check if specified PCI is target device to reassign */
5072 align
= pci_specified_resource_alignment(dev
);
5076 if (dev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
&&
5077 (dev
->class >> 8) == PCI_CLASS_BRIDGE_HOST
) {
5079 "Can't reassign resources to host bridge.\n");
5084 "Disabling memory decoding and releasing memory resources.\n");
5085 pci_read_config_word(dev
, PCI_COMMAND
, &command
);
5086 command
&= ~PCI_COMMAND_MEMORY
;
5087 pci_write_config_word(dev
, PCI_COMMAND
, command
);
5089 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++) {
5090 r
= &dev
->resource
[i
];
5091 if (!(r
->flags
& IORESOURCE_MEM
))
5093 if (r
->flags
& IORESOURCE_PCI_FIXED
) {
5094 dev_info(&dev
->dev
, "Ignoring requested alignment for BAR%d: %pR\n",
5099 size
= resource_size(r
);
5103 "Rounding up size of resource #%d to %#llx.\n",
5104 i
, (unsigned long long)size
);
5106 r
->flags
|= IORESOURCE_UNSET
;
5110 /* Need to disable bridge's resource window,
5111 * to enable the kernel to reassign new resource
5114 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
&&
5115 (dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
5116 for (i
= PCI_BRIDGE_RESOURCES
; i
< PCI_NUM_RESOURCES
; i
++) {
5117 r
= &dev
->resource
[i
];
5118 if (!(r
->flags
& IORESOURCE_MEM
))
5120 r
->flags
|= IORESOURCE_UNSET
;
5121 r
->end
= resource_size(r
) - 1;
5124 pci_disable_bridge_window(dev
);
5128 static ssize_t
pci_set_resource_alignment_param(const char *buf
, size_t count
)
5130 if (count
> RESOURCE_ALIGNMENT_PARAM_SIZE
- 1)
5131 count
= RESOURCE_ALIGNMENT_PARAM_SIZE
- 1;
5132 spin_lock(&resource_alignment_lock
);
5133 strncpy(resource_alignment_param
, buf
, count
);
5134 resource_alignment_param
[count
] = '\0';
5135 spin_unlock(&resource_alignment_lock
);
5139 static ssize_t
pci_get_resource_alignment_param(char *buf
, size_t size
)
5142 spin_lock(&resource_alignment_lock
);
5143 count
= snprintf(buf
, size
, "%s", resource_alignment_param
);
5144 spin_unlock(&resource_alignment_lock
);
5148 static ssize_t
pci_resource_alignment_show(struct bus_type
*bus
, char *buf
)
5150 return pci_get_resource_alignment_param(buf
, PAGE_SIZE
);
5153 static ssize_t
pci_resource_alignment_store(struct bus_type
*bus
,
5154 const char *buf
, size_t count
)
5156 return pci_set_resource_alignment_param(buf
, count
);
5159 static BUS_ATTR(resource_alignment
, 0644, pci_resource_alignment_show
,
5160 pci_resource_alignment_store
);
5162 static int __init
pci_resource_alignment_sysfs_init(void)
5164 return bus_create_file(&pci_bus_type
,
5165 &bus_attr_resource_alignment
);
5167 late_initcall(pci_resource_alignment_sysfs_init
);
5169 static void pci_no_domains(void)
5171 #ifdef CONFIG_PCI_DOMAINS
5172 pci_domains_supported
= 0;
5176 #ifdef CONFIG_PCI_DOMAINS
5177 static atomic_t __domain_nr
= ATOMIC_INIT(-1);
5179 int pci_get_new_domain_nr(void)
5181 return atomic_inc_return(&__domain_nr
);
5184 #ifdef CONFIG_PCI_DOMAINS_GENERIC
5185 static int of_pci_bus_find_domain_nr(struct device
*parent
)
5187 static int use_dt_domains
= -1;
5191 domain
= of_get_pci_domain_nr(parent
->of_node
);
5193 * Check DT domain and use_dt_domains values.
5195 * If DT domain property is valid (domain >= 0) and
5196 * use_dt_domains != 0, the DT assignment is valid since this means
5197 * we have not previously allocated a domain number by using
5198 * pci_get_new_domain_nr(); we should also update use_dt_domains to
5199 * 1, to indicate that we have just assigned a domain number from
5202 * If DT domain property value is not valid (ie domain < 0), and we
5203 * have not previously assigned a domain number from DT
5204 * (use_dt_domains != 1) we should assign a domain number by
5207 * pci_get_new_domain_nr()
5209 * API and update the use_dt_domains value to keep track of method we
5210 * are using to assign domain numbers (use_dt_domains = 0).
5212 * All other combinations imply we have a platform that is trying
5213 * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
5214 * which is a recipe for domain mishandling and it is prevented by
5215 * invalidating the domain value (domain = -1) and printing a
5216 * corresponding error.
5218 if (domain
>= 0 && use_dt_domains
) {
5220 } else if (domain
< 0 && use_dt_domains
!= 1) {
5222 domain
= pci_get_new_domain_nr();
5224 dev_err(parent
, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
5225 parent
->of_node
->full_name
);
5232 int pci_bus_find_domain_nr(struct pci_bus
*bus
, struct device
*parent
)
5234 return acpi_disabled
? of_pci_bus_find_domain_nr(parent
) :
5235 acpi_pci_bus_find_domain_nr(bus
);
5241 * pci_ext_cfg_avail - can we access extended PCI config space?
5243 * Returns 1 if we can access PCI extended config space (offsets
5244 * greater than 0xff). This is the default implementation. Architecture
5245 * implementations can override this.
5247 int __weak
pci_ext_cfg_avail(void)
5252 void __weak
pci_fixup_cardbus(struct pci_bus
*bus
)
5255 EXPORT_SYMBOL(pci_fixup_cardbus
);
5257 static int __init
pci_setup(char *str
)
5260 char *k
= strchr(str
, ',');
5263 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
5264 if (!strcmp(str
, "nomsi")) {
5266 } else if (!strcmp(str
, "noaer")) {
5268 } else if (!strncmp(str
, "realloc=", 8)) {
5269 pci_realloc_get_opt(str
+ 8);
5270 } else if (!strncmp(str
, "realloc", 7)) {
5271 pci_realloc_get_opt("on");
5272 } else if (!strcmp(str
, "nodomains")) {
5274 } else if (!strncmp(str
, "noari", 5)) {
5275 pcie_ari_disabled
= true;
5276 } else if (!strncmp(str
, "cbiosize=", 9)) {
5277 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
5278 } else if (!strncmp(str
, "cbmemsize=", 10)) {
5279 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
5280 } else if (!strncmp(str
, "resource_alignment=", 19)) {
5281 pci_set_resource_alignment_param(str
+ 19,
5283 } else if (!strncmp(str
, "ecrc=", 5)) {
5284 pcie_ecrc_get_policy(str
+ 5);
5285 } else if (!strncmp(str
, "hpiosize=", 9)) {
5286 pci_hotplug_io_size
= memparse(str
+ 9, &str
);
5287 } else if (!strncmp(str
, "hpmemsize=", 10)) {
5288 pci_hotplug_mem_size
= memparse(str
+ 10, &str
);
5289 } else if (!strncmp(str
, "hpbussize=", 10)) {
5290 pci_hotplug_bus_size
=
5291 simple_strtoul(str
+ 10, &str
, 0);
5292 if (pci_hotplug_bus_size
> 0xff)
5293 pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
5294 } else if (!strncmp(str
, "pcie_bus_tune_off", 17)) {
5295 pcie_bus_config
= PCIE_BUS_TUNE_OFF
;
5296 } else if (!strncmp(str
, "pcie_bus_safe", 13)) {
5297 pcie_bus_config
= PCIE_BUS_SAFE
;
5298 } else if (!strncmp(str
, "pcie_bus_perf", 13)) {
5299 pcie_bus_config
= PCIE_BUS_PERFORMANCE
;
5300 } else if (!strncmp(str
, "pcie_bus_peer2peer", 18)) {
5301 pcie_bus_config
= PCIE_BUS_PEER2PEER
;
5302 } else if (!strncmp(str
, "pcie_scan_all", 13)) {
5303 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS
);
5305 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
5313 early_param("pci", pci_setup
);