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
;
72 #ifdef CONFIG_PCI_DOMAINS
73 int pci_domains_supported
= 1;
76 #define DEFAULT_CARDBUS_IO_SIZE (256)
77 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
78 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
79 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
80 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
82 #define DEFAULT_HOTPLUG_IO_SIZE (256)
83 #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
84 /* pci=hpmemsize=nnM,hpiosize=nn can override this */
85 unsigned long pci_hotplug_io_size
= DEFAULT_HOTPLUG_IO_SIZE
;
86 unsigned long pci_hotplug_mem_size
= DEFAULT_HOTPLUG_MEM_SIZE
;
88 #define DEFAULT_HOTPLUG_BUS_SIZE 1
89 unsigned long pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
91 enum pcie_bus_config_types pcie_bus_config
= PCIE_BUS_DEFAULT
;
94 * The default CLS is used if arch didn't set CLS explicitly and not
95 * all pci devices agree on the same value. Arch can override either
96 * the dfl or actual value as it sees fit. Don't forget this is
97 * measured in 32-bit words, not bytes.
99 u8 pci_dfl_cache_line_size
= L1_CACHE_BYTES
>> 2;
100 u8 pci_cache_line_size
;
103 * If we set up a device for bus mastering, we need to check the latency
104 * timer as certain BIOSes forget to set it properly.
106 unsigned int pcibios_max_latency
= 255;
108 /* If set, the PCIe ARI capability will not be used. */
109 static bool pcie_ari_disabled
;
111 /* Disable bridge_d3 for all PCIe ports */
112 static bool pci_bridge_d3_disable
;
113 /* Force bridge_d3 for all PCIe ports */
114 static bool pci_bridge_d3_force
;
116 static int __init
pcie_port_pm_setup(char *str
)
118 if (!strcmp(str
, "off"))
119 pci_bridge_d3_disable
= true;
120 else if (!strcmp(str
, "force"))
121 pci_bridge_d3_force
= true;
124 __setup("pcie_port_pm=", pcie_port_pm_setup
);
127 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
128 * @bus: pointer to PCI bus structure to search
130 * Given a PCI bus, returns the highest PCI bus number present in the set
131 * including the given PCI bus and its list of child PCI buses.
133 unsigned char pci_bus_max_busnr(struct pci_bus
*bus
)
136 unsigned char max
, n
;
138 max
= bus
->busn_res
.end
;
139 list_for_each_entry(tmp
, &bus
->children
, node
) {
140 n
= pci_bus_max_busnr(tmp
);
146 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
148 #ifdef CONFIG_HAS_IOMEM
149 void __iomem
*pci_ioremap_bar(struct pci_dev
*pdev
, int bar
)
151 struct resource
*res
= &pdev
->resource
[bar
];
154 * Make sure the BAR is actually a memory resource, not an IO resource
156 if (res
->flags
& IORESOURCE_UNSET
|| !(res
->flags
& IORESOURCE_MEM
)) {
157 dev_warn(&pdev
->dev
, "can't ioremap BAR %d: %pR\n", bar
, res
);
160 return ioremap_nocache(res
->start
, resource_size(res
));
162 EXPORT_SYMBOL_GPL(pci_ioremap_bar
);
164 void __iomem
*pci_ioremap_wc_bar(struct pci_dev
*pdev
, int bar
)
167 * Make sure the BAR is actually a memory resource, not an IO resource
169 if (!(pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)) {
173 return ioremap_wc(pci_resource_start(pdev
, bar
),
174 pci_resource_len(pdev
, bar
));
176 EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar
);
180 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
181 u8 pos
, int cap
, int *ttl
)
186 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
192 pci_bus_read_config_word(bus
, devfn
, pos
, &ent
);
204 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
207 int ttl
= PCI_FIND_CAP_TTL
;
209 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
212 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
214 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
215 pos
+ PCI_CAP_LIST_NEXT
, cap
);
217 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
219 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
220 unsigned int devfn
, u8 hdr_type
)
224 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
225 if (!(status
& PCI_STATUS_CAP_LIST
))
229 case PCI_HEADER_TYPE_NORMAL
:
230 case PCI_HEADER_TYPE_BRIDGE
:
231 return PCI_CAPABILITY_LIST
;
232 case PCI_HEADER_TYPE_CARDBUS
:
233 return PCI_CB_CAPABILITY_LIST
;
240 * pci_find_capability - query for devices' capabilities
241 * @dev: PCI device to query
242 * @cap: capability code
244 * Tell if a device supports a given PCI capability.
245 * Returns the address of the requested capability structure within the
246 * device's PCI configuration space or 0 in case the device does not
247 * support it. Possible values for @cap:
249 * %PCI_CAP_ID_PM Power Management
250 * %PCI_CAP_ID_AGP Accelerated Graphics Port
251 * %PCI_CAP_ID_VPD Vital Product Data
252 * %PCI_CAP_ID_SLOTID Slot Identification
253 * %PCI_CAP_ID_MSI Message Signalled Interrupts
254 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
255 * %PCI_CAP_ID_PCIX PCI-X
256 * %PCI_CAP_ID_EXP PCI Express
258 int pci_find_capability(struct pci_dev
*dev
, int cap
)
262 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
264 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
268 EXPORT_SYMBOL(pci_find_capability
);
271 * pci_bus_find_capability - query for devices' capabilities
272 * @bus: the PCI bus to query
273 * @devfn: PCI device to query
274 * @cap: capability code
276 * Like pci_find_capability() but works for pci devices that do not have a
277 * pci_dev structure set up yet.
279 * Returns the address of the requested capability structure within the
280 * device's PCI configuration space or 0 in case the device does not
283 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
288 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
290 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
292 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
296 EXPORT_SYMBOL(pci_bus_find_capability
);
299 * pci_find_next_ext_capability - Find an extended capability
300 * @dev: PCI device to query
301 * @start: address at which to start looking (0 to start at beginning of list)
302 * @cap: capability code
304 * Returns the address of the next matching extended capability structure
305 * within the device's PCI configuration space or 0 if the device does
306 * not support it. Some capabilities can occur several times, e.g., the
307 * vendor-specific capability, and this provides a way to find them all.
309 int pci_find_next_ext_capability(struct pci_dev
*dev
, int start
, int cap
)
313 int pos
= PCI_CFG_SPACE_SIZE
;
315 /* minimum 8 bytes per capability */
316 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
318 if (dev
->cfg_size
<= PCI_CFG_SPACE_SIZE
)
324 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
328 * If we have no capabilities, this is indicated by cap ID,
329 * cap version and next pointer all being 0.
335 if (PCI_EXT_CAP_ID(header
) == cap
&& pos
!= start
)
338 pos
= PCI_EXT_CAP_NEXT(header
);
339 if (pos
< PCI_CFG_SPACE_SIZE
)
342 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
348 EXPORT_SYMBOL_GPL(pci_find_next_ext_capability
);
351 * pci_find_ext_capability - Find an extended capability
352 * @dev: PCI device to query
353 * @cap: capability code
355 * Returns the address of the requested extended capability structure
356 * within the device's PCI configuration space or 0 if the device does
357 * not support it. Possible values for @cap:
359 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
360 * %PCI_EXT_CAP_ID_VC Virtual Channel
361 * %PCI_EXT_CAP_ID_DSN Device Serial Number
362 * %PCI_EXT_CAP_ID_PWR Power Budgeting
364 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
366 return pci_find_next_ext_capability(dev
, 0, cap
);
368 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
370 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
372 int rc
, ttl
= PCI_FIND_CAP_TTL
;
375 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
376 mask
= HT_3BIT_CAP_MASK
;
378 mask
= HT_5BIT_CAP_MASK
;
380 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
381 PCI_CAP_ID_HT
, &ttl
);
383 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
384 if (rc
!= PCIBIOS_SUCCESSFUL
)
387 if ((cap
& mask
) == ht_cap
)
390 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
391 pos
+ PCI_CAP_LIST_NEXT
,
392 PCI_CAP_ID_HT
, &ttl
);
398 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
399 * @dev: PCI device to query
400 * @pos: Position from which to continue searching
401 * @ht_cap: Hypertransport capability code
403 * To be used in conjunction with pci_find_ht_capability() to search for
404 * all capabilities matching @ht_cap. @pos should always be a value returned
405 * from pci_find_ht_capability().
407 * NB. To be 100% safe against broken PCI devices, the caller should take
408 * steps to avoid an infinite loop.
410 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
412 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
414 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
417 * pci_find_ht_capability - query a device's Hypertransport capabilities
418 * @dev: PCI device to query
419 * @ht_cap: Hypertransport capability code
421 * Tell if a device supports a given Hypertransport capability.
422 * Returns an address within the device's PCI configuration space
423 * or 0 in case the device does not support the request capability.
424 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
425 * which has a Hypertransport capability matching @ht_cap.
427 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
431 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
433 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
437 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
440 * pci_find_parent_resource - return resource region of parent bus of given region
441 * @dev: PCI device structure contains resources to be searched
442 * @res: child resource record for which parent is sought
444 * For given resource region of given device, return the resource
445 * region of parent bus the given region is contained in.
447 struct resource
*pci_find_parent_resource(const struct pci_dev
*dev
,
448 struct resource
*res
)
450 const struct pci_bus
*bus
= dev
->bus
;
454 pci_bus_for_each_resource(bus
, r
, i
) {
457 if (res
->start
&& resource_contains(r
, res
)) {
460 * If the window is prefetchable but the BAR is
461 * not, the allocator made a mistake.
463 if (r
->flags
& IORESOURCE_PREFETCH
&&
464 !(res
->flags
& IORESOURCE_PREFETCH
))
468 * If we're below a transparent bridge, there may
469 * be both a positively-decoded aperture and a
470 * subtractively-decoded region that contain the BAR.
471 * We want the positively-decoded one, so this depends
472 * on pci_bus_for_each_resource() giving us those
480 EXPORT_SYMBOL(pci_find_parent_resource
);
483 * pci_find_resource - Return matching PCI device resource
484 * @dev: PCI device to query
485 * @res: Resource to look for
487 * Goes over standard PCI resources (BARs) and checks if the given resource
488 * is partially or fully contained in any of them. In that case the
489 * matching resource is returned, %NULL otherwise.
491 struct resource
*pci_find_resource(struct pci_dev
*dev
, struct resource
*res
)
495 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
496 struct resource
*r
= &dev
->resource
[i
];
498 if (r
->start
&& resource_contains(r
, res
))
504 EXPORT_SYMBOL(pci_find_resource
);
507 * pci_find_pcie_root_port - return PCIe Root Port
508 * @dev: PCI device to query
510 * Traverse up the parent chain and return the PCIe Root Port PCI Device
511 * for a given PCI Device.
513 struct pci_dev
*pci_find_pcie_root_port(struct pci_dev
*dev
)
515 struct pci_dev
*bridge
, *highest_pcie_bridge
= NULL
;
517 bridge
= pci_upstream_bridge(dev
);
518 while (bridge
&& pci_is_pcie(bridge
)) {
519 highest_pcie_bridge
= bridge
;
520 bridge
= pci_upstream_bridge(bridge
);
523 if (pci_pcie_type(highest_pcie_bridge
) != PCI_EXP_TYPE_ROOT_PORT
)
526 return highest_pcie_bridge
;
528 EXPORT_SYMBOL(pci_find_pcie_root_port
);
531 * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
532 * @dev: the PCI device to operate on
533 * @pos: config space offset of status word
534 * @mask: mask of bit(s) to care about in status word
536 * Return 1 when mask bit(s) in status word clear, 0 otherwise.
538 int pci_wait_for_pending(struct pci_dev
*dev
, int pos
, u16 mask
)
542 /* Wait for Transaction Pending bit clean */
543 for (i
= 0; i
< 4; i
++) {
546 msleep((1 << (i
- 1)) * 100);
548 pci_read_config_word(dev
, pos
, &status
);
549 if (!(status
& mask
))
557 * pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
558 * @dev: PCI device to have its BARs restored
560 * Restore the BAR values for a given device, so as to make it
561 * accessible by its driver.
563 static void pci_restore_bars(struct pci_dev
*dev
)
567 /* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
571 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++)
572 pci_update_resource(dev
, i
);
575 static const struct pci_platform_pm_ops
*pci_platform_pm
;
577 int pci_set_platform_pm(const struct pci_platform_pm_ops
*ops
)
579 if (!ops
->is_manageable
|| !ops
->set_state
|| !ops
->get_state
||
580 !ops
->choose_state
|| !ops
->sleep_wake
|| !ops
->run_wake
||
583 pci_platform_pm
= ops
;
587 static inline bool platform_pci_power_manageable(struct pci_dev
*dev
)
589 return pci_platform_pm
? pci_platform_pm
->is_manageable(dev
) : false;
592 static inline int platform_pci_set_power_state(struct pci_dev
*dev
,
595 return pci_platform_pm
? pci_platform_pm
->set_state(dev
, t
) : -ENOSYS
;
598 static inline pci_power_t
platform_pci_get_power_state(struct pci_dev
*dev
)
600 return pci_platform_pm
? pci_platform_pm
->get_state(dev
) : PCI_UNKNOWN
;
603 static inline pci_power_t
platform_pci_choose_state(struct pci_dev
*dev
)
605 return pci_platform_pm
?
606 pci_platform_pm
->choose_state(dev
) : PCI_POWER_ERROR
;
609 static inline int platform_pci_sleep_wake(struct pci_dev
*dev
, bool enable
)
611 return pci_platform_pm
?
612 pci_platform_pm
->sleep_wake(dev
, enable
) : -ENODEV
;
615 static inline int platform_pci_run_wake(struct pci_dev
*dev
, bool enable
)
617 return pci_platform_pm
?
618 pci_platform_pm
->run_wake(dev
, enable
) : -ENODEV
;
621 static inline bool platform_pci_need_resume(struct pci_dev
*dev
)
623 return pci_platform_pm
? pci_platform_pm
->need_resume(dev
) : false;
627 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
629 * @dev: PCI device to handle.
630 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
633 * -EINVAL if the requested state is invalid.
634 * -EIO if device does not support PCI PM or its PM capabilities register has a
635 * wrong version, or device doesn't support the requested state.
636 * 0 if device already is in the requested state.
637 * 0 if device's power state has been successfully changed.
639 static int pci_raw_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
642 bool need_restore
= false;
644 /* Check if we're already there */
645 if (dev
->current_state
== state
)
651 if (state
< PCI_D0
|| state
> PCI_D3hot
)
654 /* Validate current state:
655 * Can enter D0 from any state, but if we can only go deeper
656 * to sleep if we're already in a low power state
658 if (state
!= PCI_D0
&& dev
->current_state
<= PCI_D3cold
659 && dev
->current_state
> state
) {
660 dev_err(&dev
->dev
, "invalid power transition (from state %d to %d)\n",
661 dev
->current_state
, state
);
665 /* check if this device supports the desired state */
666 if ((state
== PCI_D1
&& !dev
->d1_support
)
667 || (state
== PCI_D2
&& !dev
->d2_support
))
670 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
672 /* If we're (effectively) in D3, force entire word to 0.
673 * This doesn't affect PME_Status, disables PME_En, and
674 * sets PowerState to 0.
676 switch (dev
->current_state
) {
680 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
685 case PCI_UNKNOWN
: /* Boot-up */
686 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
687 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
689 /* Fall-through: force to D0 */
695 /* enter specified state */
696 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
698 /* Mandatory power management transition delays */
699 /* see PCI PM 1.1 5.6.1 table 18 */
700 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
701 pci_dev_d3_sleep(dev
);
702 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
703 udelay(PCI_PM_D2_DELAY
);
705 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
706 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
707 if (dev
->current_state
!= state
&& printk_ratelimit())
708 dev_info(&dev
->dev
, "Refused to change power state, currently in D%d\n",
712 * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
713 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
714 * from D3hot to D0 _may_ perform an internal reset, thereby
715 * going to "D0 Uninitialized" rather than "D0 Initialized".
716 * For example, at least some versions of the 3c905B and the
717 * 3c556B exhibit this behaviour.
719 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
720 * devices in a D3hot state at boot. Consequently, we need to
721 * restore at least the BARs so that the device will be
722 * accessible to its driver.
725 pci_restore_bars(dev
);
728 pcie_aspm_pm_state_change(dev
->bus
->self
);
734 * pci_update_current_state - Read power state of given device and cache it
735 * @dev: PCI device to handle.
736 * @state: State to cache in case the device doesn't have the PM capability
738 * The power state is read from the PMCSR register, which however is
739 * inaccessible in D3cold. The platform firmware is therefore queried first
740 * to detect accessibility of the register. In case the platform firmware
741 * reports an incorrect state or the device isn't power manageable by the
742 * platform at all, we try to detect D3cold by testing accessibility of the
743 * vendor ID in config space.
745 void pci_update_current_state(struct pci_dev
*dev
, pci_power_t state
)
747 if (platform_pci_get_power_state(dev
) == PCI_D3cold
||
748 !pci_device_is_present(dev
)) {
749 dev
->current_state
= PCI_D3cold
;
750 } else if (dev
->pm_cap
) {
753 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
754 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
756 dev
->current_state
= state
;
761 * pci_power_up - Put the given device into D0 forcibly
762 * @dev: PCI device to power up
764 void pci_power_up(struct pci_dev
*dev
)
766 if (platform_pci_power_manageable(dev
))
767 platform_pci_set_power_state(dev
, PCI_D0
);
769 pci_raw_set_power_state(dev
, PCI_D0
);
770 pci_update_current_state(dev
, PCI_D0
);
774 * pci_platform_power_transition - Use platform to change device power state
775 * @dev: PCI device to handle.
776 * @state: State to put the device into.
778 static int pci_platform_power_transition(struct pci_dev
*dev
, pci_power_t state
)
782 if (platform_pci_power_manageable(dev
)) {
783 error
= platform_pci_set_power_state(dev
, state
);
785 pci_update_current_state(dev
, state
);
789 if (error
&& !dev
->pm_cap
) /* Fall back to PCI_D0 */
790 dev
->current_state
= PCI_D0
;
796 * pci_wakeup - Wake up a PCI device
797 * @pci_dev: Device to handle.
798 * @ign: ignored parameter
800 static int pci_wakeup(struct pci_dev
*pci_dev
, void *ign
)
802 pci_wakeup_event(pci_dev
);
803 pm_request_resume(&pci_dev
->dev
);
808 * pci_wakeup_bus - Walk given bus and wake up devices on it
809 * @bus: Top bus of the subtree to walk.
811 static void pci_wakeup_bus(struct pci_bus
*bus
)
814 pci_walk_bus(bus
, pci_wakeup
, NULL
);
818 * __pci_start_power_transition - Start power transition of a PCI device
819 * @dev: PCI device to handle.
820 * @state: State to put the device into.
822 static void __pci_start_power_transition(struct pci_dev
*dev
, pci_power_t state
)
824 if (state
== PCI_D0
) {
825 pci_platform_power_transition(dev
, PCI_D0
);
827 * Mandatory power management transition delays, see
828 * PCI Express Base Specification Revision 2.0 Section
829 * 6.6.1: Conventional Reset. Do not delay for
830 * devices powered on/off by corresponding bridge,
831 * because have already delayed for the bridge.
833 if (dev
->runtime_d3cold
) {
834 msleep(dev
->d3cold_delay
);
836 * When powering on a bridge from D3cold, the
837 * whole hierarchy may be powered on into
838 * D0uninitialized state, resume them to give
839 * them a chance to suspend again
841 pci_wakeup_bus(dev
->subordinate
);
847 * __pci_dev_set_current_state - Set current state of a PCI device
848 * @dev: Device to handle
849 * @data: pointer to state to be set
851 static int __pci_dev_set_current_state(struct pci_dev
*dev
, void *data
)
853 pci_power_t state
= *(pci_power_t
*)data
;
855 dev
->current_state
= state
;
860 * __pci_bus_set_current_state - Walk given bus and set current state of devices
861 * @bus: Top bus of the subtree to walk.
862 * @state: state to be set
864 static void __pci_bus_set_current_state(struct pci_bus
*bus
, pci_power_t state
)
867 pci_walk_bus(bus
, __pci_dev_set_current_state
, &state
);
871 * __pci_complete_power_transition - Complete power transition of a PCI device
872 * @dev: PCI device to handle.
873 * @state: State to put the device into.
875 * This function should not be called directly by device drivers.
877 int __pci_complete_power_transition(struct pci_dev
*dev
, pci_power_t state
)
883 ret
= pci_platform_power_transition(dev
, state
);
884 /* Power off the bridge may power off the whole hierarchy */
885 if (!ret
&& state
== PCI_D3cold
)
886 __pci_bus_set_current_state(dev
->subordinate
, PCI_D3cold
);
889 EXPORT_SYMBOL_GPL(__pci_complete_power_transition
);
892 * pci_set_power_state - Set the power state of a PCI device
893 * @dev: PCI device to handle.
894 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
896 * Transition a device to a new power state, using the platform firmware and/or
897 * the device's PCI PM registers.
900 * -EINVAL if the requested state is invalid.
901 * -EIO if device does not support PCI PM or its PM capabilities register has a
902 * wrong version, or device doesn't support the requested state.
903 * 0 if device already is in the requested state.
904 * 0 if device's power state has been successfully changed.
906 int pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
910 /* bound the state we're entering */
911 if (state
> PCI_D3cold
)
913 else if (state
< PCI_D0
)
915 else if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
917 * If the device or the parent bridge do not support PCI PM,
918 * ignore the request if we're doing anything other than putting
919 * it into D0 (which would only happen on boot).
923 /* Check if we're already there */
924 if (dev
->current_state
== state
)
927 __pci_start_power_transition(dev
, state
);
929 /* This device is quirked not to be put into D3, so
930 don't put it in D3 */
931 if (state
>= PCI_D3hot
&& (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3
))
935 * To put device in D3cold, we put device into D3hot in native
936 * way, then put device into D3cold with platform ops
938 error
= pci_raw_set_power_state(dev
, state
> PCI_D3hot
?
941 if (!__pci_complete_power_transition(dev
, state
))
946 EXPORT_SYMBOL(pci_set_power_state
);
949 * pci_choose_state - Choose the power state of a PCI device
950 * @dev: PCI device to be suspended
951 * @state: target sleep state for the whole system. This is the value
952 * that is passed to suspend() function.
954 * Returns PCI power state suitable for given device and given system
958 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
965 ret
= platform_pci_choose_state(dev
);
966 if (ret
!= PCI_POWER_ERROR
)
969 switch (state
.event
) {
972 case PM_EVENT_FREEZE
:
973 case PM_EVENT_PRETHAW
:
974 /* REVISIT both freeze and pre-thaw "should" use D0 */
975 case PM_EVENT_SUSPEND
:
976 case PM_EVENT_HIBERNATE
:
979 dev_info(&dev
->dev
, "unrecognized suspend event %d\n",
985 EXPORT_SYMBOL(pci_choose_state
);
987 #define PCI_EXP_SAVE_REGS 7
989 static struct pci_cap_saved_state
*_pci_find_saved_cap(struct pci_dev
*pci_dev
,
990 u16 cap
, bool extended
)
992 struct pci_cap_saved_state
*tmp
;
994 hlist_for_each_entry(tmp
, &pci_dev
->saved_cap_space
, next
) {
995 if (tmp
->cap
.cap_extended
== extended
&& tmp
->cap
.cap_nr
== cap
)
1001 struct pci_cap_saved_state
*pci_find_saved_cap(struct pci_dev
*dev
, char cap
)
1003 return _pci_find_saved_cap(dev
, cap
, false);
1006 struct pci_cap_saved_state
*pci_find_saved_ext_cap(struct pci_dev
*dev
, u16 cap
)
1008 return _pci_find_saved_cap(dev
, cap
, true);
1011 static int pci_save_pcie_state(struct pci_dev
*dev
)
1014 struct pci_cap_saved_state
*save_state
;
1017 if (!pci_is_pcie(dev
))
1020 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1022 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1026 cap
= (u16
*)&save_state
->cap
.data
[0];
1027 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &cap
[i
++]);
1028 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL
, &cap
[i
++]);
1029 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL
, &cap
[i
++]);
1030 pcie_capability_read_word(dev
, PCI_EXP_RTCTL
, &cap
[i
++]);
1031 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL2
, &cap
[i
++]);
1032 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL2
, &cap
[i
++]);
1033 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL2
, &cap
[i
++]);
1038 static void pci_restore_pcie_state(struct pci_dev
*dev
)
1041 struct pci_cap_saved_state
*save_state
;
1044 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1048 cap
= (u16
*)&save_state
->cap
.data
[0];
1049 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL
, cap
[i
++]);
1050 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL
, cap
[i
++]);
1051 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL
, cap
[i
++]);
1052 pcie_capability_write_word(dev
, PCI_EXP_RTCTL
, cap
[i
++]);
1053 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL2
, cap
[i
++]);
1054 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL2
, cap
[i
++]);
1055 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL2
, cap
[i
++]);
1059 static int pci_save_pcix_state(struct pci_dev
*dev
)
1062 struct pci_cap_saved_state
*save_state
;
1064 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1068 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1070 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1074 pci_read_config_word(dev
, pos
+ PCI_X_CMD
,
1075 (u16
*)save_state
->cap
.data
);
1080 static void pci_restore_pcix_state(struct pci_dev
*dev
)
1083 struct pci_cap_saved_state
*save_state
;
1086 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1087 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1088 if (!save_state
|| !pos
)
1090 cap
= (u16
*)&save_state
->cap
.data
[0];
1092 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
1097 * pci_save_state - save the PCI configuration space of a device before suspending
1098 * @dev: - PCI device that we're dealing with
1100 int pci_save_state(struct pci_dev
*dev
)
1103 /* XXX: 100% dword access ok here? */
1104 for (i
= 0; i
< 16; i
++)
1105 pci_read_config_dword(dev
, i
* 4, &dev
->saved_config_space
[i
]);
1106 dev
->state_saved
= true;
1108 i
= pci_save_pcie_state(dev
);
1112 i
= pci_save_pcix_state(dev
);
1116 return pci_save_vc_state(dev
);
1118 EXPORT_SYMBOL(pci_save_state
);
1120 static void pci_restore_config_dword(struct pci_dev
*pdev
, int offset
,
1121 u32 saved_val
, int retry
)
1125 pci_read_config_dword(pdev
, offset
, &val
);
1126 if (val
== saved_val
)
1130 dev_dbg(&pdev
->dev
, "restoring config space at offset %#x (was %#x, writing %#x)\n",
1131 offset
, val
, saved_val
);
1132 pci_write_config_dword(pdev
, offset
, saved_val
);
1136 pci_read_config_dword(pdev
, offset
, &val
);
1137 if (val
== saved_val
)
1144 static void pci_restore_config_space_range(struct pci_dev
*pdev
,
1145 int start
, int end
, int retry
)
1149 for (index
= end
; index
>= start
; index
--)
1150 pci_restore_config_dword(pdev
, 4 * index
,
1151 pdev
->saved_config_space
[index
],
1155 static void pci_restore_config_space(struct pci_dev
*pdev
)
1157 if (pdev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
) {
1158 pci_restore_config_space_range(pdev
, 10, 15, 0);
1159 /* Restore BARs before the command register. */
1160 pci_restore_config_space_range(pdev
, 4, 9, 10);
1161 pci_restore_config_space_range(pdev
, 0, 3, 0);
1163 pci_restore_config_space_range(pdev
, 0, 15, 0);
1168 * pci_restore_state - Restore the saved state of a PCI device
1169 * @dev: - PCI device that we're dealing with
1171 void pci_restore_state(struct pci_dev
*dev
)
1173 if (!dev
->state_saved
)
1176 /* PCI Express register must be restored first */
1177 pci_restore_pcie_state(dev
);
1178 pci_restore_ats_state(dev
);
1179 pci_restore_vc_state(dev
);
1181 pci_cleanup_aer_error_status_regs(dev
);
1183 pci_restore_config_space(dev
);
1185 pci_restore_pcix_state(dev
);
1186 pci_restore_msi_state(dev
);
1188 /* Restore ACS and IOV configuration state */
1189 pci_enable_acs(dev
);
1190 pci_restore_iov_state(dev
);
1192 dev
->state_saved
= false;
1194 EXPORT_SYMBOL(pci_restore_state
);
1196 struct pci_saved_state
{
1197 u32 config_space
[16];
1198 struct pci_cap_saved_data cap
[0];
1202 * pci_store_saved_state - Allocate and return an opaque struct containing
1203 * the device saved state.
1204 * @dev: PCI device that we're dealing with
1206 * Return NULL if no state or error.
1208 struct pci_saved_state
*pci_store_saved_state(struct pci_dev
*dev
)
1210 struct pci_saved_state
*state
;
1211 struct pci_cap_saved_state
*tmp
;
1212 struct pci_cap_saved_data
*cap
;
1215 if (!dev
->state_saved
)
1218 size
= sizeof(*state
) + sizeof(struct pci_cap_saved_data
);
1220 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
)
1221 size
+= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1223 state
= kzalloc(size
, GFP_KERNEL
);
1227 memcpy(state
->config_space
, dev
->saved_config_space
,
1228 sizeof(state
->config_space
));
1231 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
) {
1232 size_t len
= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1233 memcpy(cap
, &tmp
->cap
, len
);
1234 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+ len
);
1236 /* Empty cap_save terminates list */
1240 EXPORT_SYMBOL_GPL(pci_store_saved_state
);
1243 * pci_load_saved_state - Reload the provided save state into struct pci_dev.
1244 * @dev: PCI device that we're dealing with
1245 * @state: Saved state returned from pci_store_saved_state()
1247 int pci_load_saved_state(struct pci_dev
*dev
,
1248 struct pci_saved_state
*state
)
1250 struct pci_cap_saved_data
*cap
;
1252 dev
->state_saved
= false;
1257 memcpy(dev
->saved_config_space
, state
->config_space
,
1258 sizeof(state
->config_space
));
1262 struct pci_cap_saved_state
*tmp
;
1264 tmp
= _pci_find_saved_cap(dev
, cap
->cap_nr
, cap
->cap_extended
);
1265 if (!tmp
|| tmp
->cap
.size
!= cap
->size
)
1268 memcpy(tmp
->cap
.data
, cap
->data
, tmp
->cap
.size
);
1269 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+
1270 sizeof(struct pci_cap_saved_data
) + cap
->size
);
1273 dev
->state_saved
= true;
1276 EXPORT_SYMBOL_GPL(pci_load_saved_state
);
1279 * pci_load_and_free_saved_state - Reload the save state pointed to by state,
1280 * and free the memory allocated for it.
1281 * @dev: PCI device that we're dealing with
1282 * @state: Pointer to saved state returned from pci_store_saved_state()
1284 int pci_load_and_free_saved_state(struct pci_dev
*dev
,
1285 struct pci_saved_state
**state
)
1287 int ret
= pci_load_saved_state(dev
, *state
);
1292 EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state
);
1294 int __weak
pcibios_enable_device(struct pci_dev
*dev
, int bars
)
1296 return pci_enable_resources(dev
, bars
);
1299 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
1302 struct pci_dev
*bridge
;
1306 err
= pci_set_power_state(dev
, PCI_D0
);
1307 if (err
< 0 && err
!= -EIO
)
1310 bridge
= pci_upstream_bridge(dev
);
1312 pcie_aspm_powersave_config_link(bridge
);
1314 err
= pcibios_enable_device(dev
, bars
);
1317 pci_fixup_device(pci_fixup_enable
, dev
);
1319 if (dev
->msi_enabled
|| dev
->msix_enabled
)
1322 pci_read_config_byte(dev
, PCI_INTERRUPT_PIN
, &pin
);
1324 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1325 if (cmd
& PCI_COMMAND_INTX_DISABLE
)
1326 pci_write_config_word(dev
, PCI_COMMAND
,
1327 cmd
& ~PCI_COMMAND_INTX_DISABLE
);
1334 * pci_reenable_device - Resume abandoned device
1335 * @dev: PCI device to be resumed
1337 * Note this function is a backend of pci_default_resume and is not supposed
1338 * to be called by normal code, write proper resume handler and use it instead.
1340 int pci_reenable_device(struct pci_dev
*dev
)
1342 if (pci_is_enabled(dev
))
1343 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
1346 EXPORT_SYMBOL(pci_reenable_device
);
1348 static void pci_enable_bridge(struct pci_dev
*dev
)
1350 struct pci_dev
*bridge
;
1353 bridge
= pci_upstream_bridge(dev
);
1355 pci_enable_bridge(bridge
);
1357 if (pci_is_enabled(dev
)) {
1358 if (!dev
->is_busmaster
)
1359 pci_set_master(dev
);
1363 retval
= pci_enable_device(dev
);
1365 dev_err(&dev
->dev
, "Error enabling bridge (%d), continuing\n",
1367 pci_set_master(dev
);
1370 static int pci_enable_device_flags(struct pci_dev
*dev
, unsigned long flags
)
1372 struct pci_dev
*bridge
;
1377 * Power state could be unknown at this point, either due to a fresh
1378 * boot or a device removal call. So get the current power state
1379 * so that things like MSI message writing will behave as expected
1380 * (e.g. if the device really is in D0 at enable time).
1384 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1385 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
1388 if (atomic_inc_return(&dev
->enable_cnt
) > 1)
1389 return 0; /* already enabled */
1391 bridge
= pci_upstream_bridge(dev
);
1393 pci_enable_bridge(bridge
);
1395 /* only skip sriov related */
1396 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1397 if (dev
->resource
[i
].flags
& flags
)
1399 for (i
= PCI_BRIDGE_RESOURCES
; i
< DEVICE_COUNT_RESOURCE
; i
++)
1400 if (dev
->resource
[i
].flags
& flags
)
1403 err
= do_pci_enable_device(dev
, bars
);
1405 atomic_dec(&dev
->enable_cnt
);
1410 * pci_enable_device_io - Initialize a device for use with IO space
1411 * @dev: PCI device to be initialized
1413 * Initialize device before it's used by a driver. Ask low-level code
1414 * to enable I/O resources. Wake up the device if it was suspended.
1415 * Beware, this function can fail.
1417 int pci_enable_device_io(struct pci_dev
*dev
)
1419 return pci_enable_device_flags(dev
, IORESOURCE_IO
);
1421 EXPORT_SYMBOL(pci_enable_device_io
);
1424 * pci_enable_device_mem - Initialize a device for use with Memory space
1425 * @dev: PCI device to be initialized
1427 * Initialize device before it's used by a driver. Ask low-level code
1428 * to enable Memory resources. Wake up the device if it was suspended.
1429 * Beware, this function can fail.
1431 int pci_enable_device_mem(struct pci_dev
*dev
)
1433 return pci_enable_device_flags(dev
, IORESOURCE_MEM
);
1435 EXPORT_SYMBOL(pci_enable_device_mem
);
1438 * pci_enable_device - Initialize device before it's used by a driver.
1439 * @dev: PCI device to be initialized
1441 * Initialize device before it's used by a driver. Ask low-level code
1442 * to enable I/O and memory. Wake up the device if it was suspended.
1443 * Beware, this function can fail.
1445 * Note we don't actually enable the device many times if we call
1446 * this function repeatedly (we just increment the count).
1448 int pci_enable_device(struct pci_dev
*dev
)
1450 return pci_enable_device_flags(dev
, IORESOURCE_MEM
| IORESOURCE_IO
);
1452 EXPORT_SYMBOL(pci_enable_device
);
1455 * Managed PCI resources. This manages device on/off, intx/msi/msix
1456 * on/off and BAR regions. pci_dev itself records msi/msix status, so
1457 * there's no need to track it separately. pci_devres is initialized
1458 * when a device is enabled using managed PCI device enable interface.
1461 unsigned int enabled
:1;
1462 unsigned int pinned
:1;
1463 unsigned int orig_intx
:1;
1464 unsigned int restore_intx
:1;
1468 static void pcim_release(struct device
*gendev
, void *res
)
1470 struct pci_dev
*dev
= to_pci_dev(gendev
);
1471 struct pci_devres
*this = res
;
1474 if (dev
->msi_enabled
)
1475 pci_disable_msi(dev
);
1476 if (dev
->msix_enabled
)
1477 pci_disable_msix(dev
);
1479 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
1480 if (this->region_mask
& (1 << i
))
1481 pci_release_region(dev
, i
);
1483 if (this->restore_intx
)
1484 pci_intx(dev
, this->orig_intx
);
1486 if (this->enabled
&& !this->pinned
)
1487 pci_disable_device(dev
);
1490 static struct pci_devres
*get_pci_dr(struct pci_dev
*pdev
)
1492 struct pci_devres
*dr
, *new_dr
;
1494 dr
= devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1498 new_dr
= devres_alloc(pcim_release
, sizeof(*new_dr
), GFP_KERNEL
);
1501 return devres_get(&pdev
->dev
, new_dr
, NULL
, NULL
);
1504 static struct pci_devres
*find_pci_dr(struct pci_dev
*pdev
)
1506 if (pci_is_managed(pdev
))
1507 return devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1512 * pcim_enable_device - Managed pci_enable_device()
1513 * @pdev: PCI device to be initialized
1515 * Managed pci_enable_device().
1517 int pcim_enable_device(struct pci_dev
*pdev
)
1519 struct pci_devres
*dr
;
1522 dr
= get_pci_dr(pdev
);
1528 rc
= pci_enable_device(pdev
);
1530 pdev
->is_managed
= 1;
1535 EXPORT_SYMBOL(pcim_enable_device
);
1538 * pcim_pin_device - Pin managed PCI device
1539 * @pdev: PCI device to pin
1541 * Pin managed PCI device @pdev. Pinned device won't be disabled on
1542 * driver detach. @pdev must have been enabled with
1543 * pcim_enable_device().
1545 void pcim_pin_device(struct pci_dev
*pdev
)
1547 struct pci_devres
*dr
;
1549 dr
= find_pci_dr(pdev
);
1550 WARN_ON(!dr
|| !dr
->enabled
);
1554 EXPORT_SYMBOL(pcim_pin_device
);
1557 * pcibios_add_device - provide arch specific hooks when adding device dev
1558 * @dev: the PCI device being added
1560 * Permits the platform to provide architecture specific functionality when
1561 * devices are added. This is the default implementation. Architecture
1562 * implementations can override this.
1564 int __weak
pcibios_add_device(struct pci_dev
*dev
)
1570 * pcibios_release_device - provide arch specific hooks when releasing device dev
1571 * @dev: the PCI device being released
1573 * Permits the platform to provide architecture specific functionality when
1574 * devices are released. This is the default implementation. Architecture
1575 * implementations can override this.
1577 void __weak
pcibios_release_device(struct pci_dev
*dev
) {}
1580 * pcibios_disable_device - disable arch specific PCI resources for device dev
1581 * @dev: the PCI device to disable
1583 * Disables architecture specific PCI resources for the device. This
1584 * is the default implementation. Architecture implementations can
1587 void __weak
pcibios_disable_device(struct pci_dev
*dev
) {}
1590 * pcibios_penalize_isa_irq - penalize an ISA IRQ
1591 * @irq: ISA IRQ to penalize
1592 * @active: IRQ active or not
1594 * Permits the platform to provide architecture-specific functionality when
1595 * penalizing ISA IRQs. This is the default implementation. Architecture
1596 * implementations can override this.
1598 void __weak
pcibios_penalize_isa_irq(int irq
, int active
) {}
1600 static void do_pci_disable_device(struct pci_dev
*dev
)
1604 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
1605 if (pci_command
& PCI_COMMAND_MASTER
) {
1606 pci_command
&= ~PCI_COMMAND_MASTER
;
1607 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
1610 pcibios_disable_device(dev
);
1614 * pci_disable_enabled_device - Disable device without updating enable_cnt
1615 * @dev: PCI device to disable
1617 * NOTE: This function is a backend of PCI power management routines and is
1618 * not supposed to be called drivers.
1620 void pci_disable_enabled_device(struct pci_dev
*dev
)
1622 if (pci_is_enabled(dev
))
1623 do_pci_disable_device(dev
);
1627 * pci_disable_device - Disable PCI device after use
1628 * @dev: PCI device to be disabled
1630 * Signal to the system that the PCI device is not in use by the system
1631 * anymore. This only involves disabling PCI bus-mastering, if active.
1633 * Note we don't actually disable the device until all callers of
1634 * pci_enable_device() have called pci_disable_device().
1636 void pci_disable_device(struct pci_dev
*dev
)
1638 struct pci_devres
*dr
;
1640 dr
= find_pci_dr(dev
);
1644 dev_WARN_ONCE(&dev
->dev
, atomic_read(&dev
->enable_cnt
) <= 0,
1645 "disabling already-disabled device");
1647 if (atomic_dec_return(&dev
->enable_cnt
) != 0)
1650 do_pci_disable_device(dev
);
1652 dev
->is_busmaster
= 0;
1654 EXPORT_SYMBOL(pci_disable_device
);
1657 * pcibios_set_pcie_reset_state - set reset state for device dev
1658 * @dev: the PCIe device reset
1659 * @state: Reset state to enter into
1662 * Sets the PCIe reset state for the device. This is the default
1663 * implementation. Architecture implementations can override this.
1665 int __weak
pcibios_set_pcie_reset_state(struct pci_dev
*dev
,
1666 enum pcie_reset_state state
)
1672 * pci_set_pcie_reset_state - set reset state for device dev
1673 * @dev: the PCIe device reset
1674 * @state: Reset state to enter into
1677 * Sets the PCI reset state for the device.
1679 int pci_set_pcie_reset_state(struct pci_dev
*dev
, enum pcie_reset_state state
)
1681 return pcibios_set_pcie_reset_state(dev
, state
);
1683 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state
);
1686 * pci_check_pme_status - Check if given device has generated PME.
1687 * @dev: Device to check.
1689 * Check the PME status of the device and if set, clear it and clear PME enable
1690 * (if set). Return 'true' if PME status and PME enable were both set or
1691 * 'false' otherwise.
1693 bool pci_check_pme_status(struct pci_dev
*dev
)
1702 pmcsr_pos
= dev
->pm_cap
+ PCI_PM_CTRL
;
1703 pci_read_config_word(dev
, pmcsr_pos
, &pmcsr
);
1704 if (!(pmcsr
& PCI_PM_CTRL_PME_STATUS
))
1707 /* Clear PME status. */
1708 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1709 if (pmcsr
& PCI_PM_CTRL_PME_ENABLE
) {
1710 /* Disable PME to avoid interrupt flood. */
1711 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1715 pci_write_config_word(dev
, pmcsr_pos
, pmcsr
);
1721 * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
1722 * @dev: Device to handle.
1723 * @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
1725 * Check if @dev has generated PME and queue a resume request for it in that
1728 static int pci_pme_wakeup(struct pci_dev
*dev
, void *pme_poll_reset
)
1730 if (pme_poll_reset
&& dev
->pme_poll
)
1731 dev
->pme_poll
= false;
1733 if (pci_check_pme_status(dev
)) {
1734 pci_wakeup_event(dev
);
1735 pm_request_resume(&dev
->dev
);
1741 * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
1742 * @bus: Top bus of the subtree to walk.
1744 void pci_pme_wakeup_bus(struct pci_bus
*bus
)
1747 pci_walk_bus(bus
, pci_pme_wakeup
, (void *)true);
1752 * pci_pme_capable - check the capability of PCI device to generate PME#
1753 * @dev: PCI device to handle.
1754 * @state: PCI state from which device will issue PME#.
1756 bool pci_pme_capable(struct pci_dev
*dev
, pci_power_t state
)
1761 return !!(dev
->pme_support
& (1 << state
));
1763 EXPORT_SYMBOL(pci_pme_capable
);
1765 static void pci_pme_list_scan(struct work_struct
*work
)
1767 struct pci_pme_device
*pme_dev
, *n
;
1769 mutex_lock(&pci_pme_list_mutex
);
1770 list_for_each_entry_safe(pme_dev
, n
, &pci_pme_list
, list
) {
1771 if (pme_dev
->dev
->pme_poll
) {
1772 struct pci_dev
*bridge
;
1774 bridge
= pme_dev
->dev
->bus
->self
;
1776 * If bridge is in low power state, the
1777 * configuration space of subordinate devices
1778 * may be not accessible
1780 if (bridge
&& bridge
->current_state
!= PCI_D0
)
1782 pci_pme_wakeup(pme_dev
->dev
, NULL
);
1784 list_del(&pme_dev
->list
);
1788 if (!list_empty(&pci_pme_list
))
1789 schedule_delayed_work(&pci_pme_work
,
1790 msecs_to_jiffies(PME_TIMEOUT
));
1791 mutex_unlock(&pci_pme_list_mutex
);
1794 static void __pci_pme_active(struct pci_dev
*dev
, bool enable
)
1798 if (!dev
->pme_support
)
1801 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1802 /* Clear PME_Status by writing 1 to it and enable PME# */
1803 pmcsr
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
1805 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1807 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1811 * pci_pme_active - enable or disable PCI device's PME# function
1812 * @dev: PCI device to handle.
1813 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1815 * The caller must verify that the device is capable of generating PME# before
1816 * calling this function with @enable equal to 'true'.
1818 void pci_pme_active(struct pci_dev
*dev
, bool enable
)
1820 __pci_pme_active(dev
, enable
);
1823 * PCI (as opposed to PCIe) PME requires that the device have
1824 * its PME# line hooked up correctly. Not all hardware vendors
1825 * do this, so the PME never gets delivered and the device
1826 * remains asleep. The easiest way around this is to
1827 * periodically walk the list of suspended devices and check
1828 * whether any have their PME flag set. The assumption is that
1829 * we'll wake up often enough anyway that this won't be a huge
1830 * hit, and the power savings from the devices will still be a
1833 * Although PCIe uses in-band PME message instead of PME# line
1834 * to report PME, PME does not work for some PCIe devices in
1835 * reality. For example, there are devices that set their PME
1836 * status bits, but don't really bother to send a PME message;
1837 * there are PCI Express Root Ports that don't bother to
1838 * trigger interrupts when they receive PME messages from the
1839 * devices below. So PME poll is used for PCIe devices too.
1842 if (dev
->pme_poll
) {
1843 struct pci_pme_device
*pme_dev
;
1845 pme_dev
= kmalloc(sizeof(struct pci_pme_device
),
1848 dev_warn(&dev
->dev
, "can't enable PME#\n");
1852 mutex_lock(&pci_pme_list_mutex
);
1853 list_add(&pme_dev
->list
, &pci_pme_list
);
1854 if (list_is_singular(&pci_pme_list
))
1855 schedule_delayed_work(&pci_pme_work
,
1856 msecs_to_jiffies(PME_TIMEOUT
));
1857 mutex_unlock(&pci_pme_list_mutex
);
1859 mutex_lock(&pci_pme_list_mutex
);
1860 list_for_each_entry(pme_dev
, &pci_pme_list
, list
) {
1861 if (pme_dev
->dev
== dev
) {
1862 list_del(&pme_dev
->list
);
1867 mutex_unlock(&pci_pme_list_mutex
);
1871 dev_dbg(&dev
->dev
, "PME# %s\n", enable
? "enabled" : "disabled");
1873 EXPORT_SYMBOL(pci_pme_active
);
1876 * __pci_enable_wake - enable PCI device as wakeup event source
1877 * @dev: PCI device affected
1878 * @state: PCI state from which device will issue wakeup events
1879 * @runtime: True if the events are to be generated at run time
1880 * @enable: True to enable event generation; false to disable
1882 * This enables the device as a wakeup event source, or disables it.
1883 * When such events involves platform-specific hooks, those hooks are
1884 * called automatically by this routine.
1886 * Devices with legacy power management (no standard PCI PM capabilities)
1887 * always require such platform hooks.
1890 * 0 is returned on success
1891 * -EINVAL is returned if device is not supposed to wake up the system
1892 * Error code depending on the platform is returned if both the platform and
1893 * the native mechanism fail to enable the generation of wake-up events
1895 int __pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
,
1896 bool runtime
, bool enable
)
1900 if (enable
&& !runtime
&& !device_may_wakeup(&dev
->dev
))
1903 /* Don't do the same thing twice in a row for one device. */
1904 if (!!enable
== !!dev
->wakeup_prepared
)
1908 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1909 * Anderson we should be doing PME# wake enable followed by ACPI wake
1910 * enable. To disable wake-up we call the platform first, for symmetry.
1916 if (pci_pme_capable(dev
, state
))
1917 pci_pme_active(dev
, true);
1920 error
= runtime
? platform_pci_run_wake(dev
, true) :
1921 platform_pci_sleep_wake(dev
, true);
1925 dev
->wakeup_prepared
= true;
1928 platform_pci_run_wake(dev
, false);
1930 platform_pci_sleep_wake(dev
, false);
1931 pci_pme_active(dev
, false);
1932 dev
->wakeup_prepared
= false;
1937 EXPORT_SYMBOL(__pci_enable_wake
);
1940 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1941 * @dev: PCI device to prepare
1942 * @enable: True to enable wake-up event generation; false to disable
1944 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1945 * and this function allows them to set that up cleanly - pci_enable_wake()
1946 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1947 * ordering constraints.
1949 * This function only returns error code if the device is not capable of
1950 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1951 * enable wake-up power for it.
1953 int pci_wake_from_d3(struct pci_dev
*dev
, bool enable
)
1955 return pci_pme_capable(dev
, PCI_D3cold
) ?
1956 pci_enable_wake(dev
, PCI_D3cold
, enable
) :
1957 pci_enable_wake(dev
, PCI_D3hot
, enable
);
1959 EXPORT_SYMBOL(pci_wake_from_d3
);
1962 * pci_target_state - find an appropriate low power state for a given PCI dev
1965 * Use underlying platform code to find a supported low power state for @dev.
1966 * If the platform can't manage @dev, return the deepest state from which it
1967 * can generate wake events, based on any available PME info.
1969 static pci_power_t
pci_target_state(struct pci_dev
*dev
)
1971 pci_power_t target_state
= PCI_D3hot
;
1973 if (platform_pci_power_manageable(dev
)) {
1975 * Call the platform to choose the target state of the device
1976 * and enable wake-up from this state if supported.
1978 pci_power_t state
= platform_pci_choose_state(dev
);
1981 case PCI_POWER_ERROR
:
1986 if (pci_no_d1d2(dev
))
1989 target_state
= state
;
1992 return target_state
;
1996 target_state
= PCI_D0
;
1999 * If the device is in D3cold even though it's not power-manageable by
2000 * the platform, it may have been powered down by non-standard means.
2001 * Best to let it slumber.
2003 if (dev
->current_state
== PCI_D3cold
)
2004 target_state
= PCI_D3cold
;
2006 if (device_may_wakeup(&dev
->dev
)) {
2008 * Find the deepest state from which the device can generate
2009 * wake-up events, make it the target state and enable device
2012 if (dev
->pme_support
) {
2014 && !(dev
->pme_support
& (1 << target_state
)))
2019 return target_state
;
2023 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
2024 * @dev: Device to handle.
2026 * Choose the power state appropriate for the device depending on whether
2027 * it can wake up the system and/or is power manageable by the platform
2028 * (PCI_D3hot is the default) and put the device into that state.
2030 int pci_prepare_to_sleep(struct pci_dev
*dev
)
2032 pci_power_t target_state
= pci_target_state(dev
);
2035 if (target_state
== PCI_POWER_ERROR
)
2038 pci_enable_wake(dev
, target_state
, device_may_wakeup(&dev
->dev
));
2040 error
= pci_set_power_state(dev
, target_state
);
2043 pci_enable_wake(dev
, target_state
, false);
2047 EXPORT_SYMBOL(pci_prepare_to_sleep
);
2050 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
2051 * @dev: Device to handle.
2053 * Disable device's system wake-up capability and put it into D0.
2055 int pci_back_from_sleep(struct pci_dev
*dev
)
2057 pci_enable_wake(dev
, PCI_D0
, false);
2058 return pci_set_power_state(dev
, PCI_D0
);
2060 EXPORT_SYMBOL(pci_back_from_sleep
);
2063 * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
2064 * @dev: PCI device being suspended.
2066 * Prepare @dev to generate wake-up events at run time and put it into a low
2069 int pci_finish_runtime_suspend(struct pci_dev
*dev
)
2071 pci_power_t target_state
= pci_target_state(dev
);
2074 if (target_state
== PCI_POWER_ERROR
)
2077 dev
->runtime_d3cold
= target_state
== PCI_D3cold
;
2079 __pci_enable_wake(dev
, target_state
, true, pci_dev_run_wake(dev
));
2081 error
= pci_set_power_state(dev
, target_state
);
2084 __pci_enable_wake(dev
, target_state
, true, false);
2085 dev
->runtime_d3cold
= false;
2092 * pci_dev_run_wake - Check if device can generate run-time wake-up events.
2093 * @dev: Device to check.
2095 * Return true if the device itself is capable of generating wake-up events
2096 * (through the platform or using the native PCIe PME) or if the device supports
2097 * PME and one of its upstream bridges can generate wake-up events.
2099 bool pci_dev_run_wake(struct pci_dev
*dev
)
2101 struct pci_bus
*bus
= dev
->bus
;
2103 if (device_run_wake(&dev
->dev
))
2106 if (!dev
->pme_support
)
2109 /* PME-capable in principle, but not from the intended sleep state */
2110 if (!pci_pme_capable(dev
, pci_target_state(dev
)))
2113 while (bus
->parent
) {
2114 struct pci_dev
*bridge
= bus
->self
;
2116 if (device_run_wake(&bridge
->dev
))
2122 /* We have reached the root bus. */
2124 return device_run_wake(bus
->bridge
);
2128 EXPORT_SYMBOL_GPL(pci_dev_run_wake
);
2131 * pci_dev_keep_suspended - Check if the device can stay in the suspended state.
2132 * @pci_dev: Device to check.
2134 * Return 'true' if the device is runtime-suspended, it doesn't have to be
2135 * reconfigured due to wakeup settings difference between system and runtime
2136 * suspend and the current power state of it is suitable for the upcoming
2137 * (system) transition.
2139 * If the device is not configured for system wakeup, disable PME for it before
2140 * returning 'true' to prevent it from waking up the system unnecessarily.
2142 bool pci_dev_keep_suspended(struct pci_dev
*pci_dev
)
2144 struct device
*dev
= &pci_dev
->dev
;
2146 if (!pm_runtime_suspended(dev
)
2147 || pci_target_state(pci_dev
) != pci_dev
->current_state
2148 || platform_pci_need_resume(pci_dev
))
2152 * At this point the device is good to go unless it's been configured
2153 * to generate PME at the runtime suspend time, but it is not supposed
2154 * to wake up the system. In that case, simply disable PME for it
2155 * (it will have to be re-enabled on exit from system resume).
2157 * If the device's power state is D3cold and the platform check above
2158 * hasn't triggered, the device's configuration is suitable and we don't
2159 * need to manipulate it at all.
2161 spin_lock_irq(&dev
->power
.lock
);
2163 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
&&
2164 !device_may_wakeup(dev
))
2165 __pci_pme_active(pci_dev
, false);
2167 spin_unlock_irq(&dev
->power
.lock
);
2172 * pci_dev_complete_resume - Finalize resume from system sleep for a device.
2173 * @pci_dev: Device to handle.
2175 * If the device is runtime suspended and wakeup-capable, enable PME for it as
2176 * it might have been disabled during the prepare phase of system suspend if
2177 * the device was not configured for system wakeup.
2179 void pci_dev_complete_resume(struct pci_dev
*pci_dev
)
2181 struct device
*dev
= &pci_dev
->dev
;
2183 if (!pci_dev_run_wake(pci_dev
))
2186 spin_lock_irq(&dev
->power
.lock
);
2188 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
)
2189 __pci_pme_active(pci_dev
, true);
2191 spin_unlock_irq(&dev
->power
.lock
);
2194 void pci_config_pm_runtime_get(struct pci_dev
*pdev
)
2196 struct device
*dev
= &pdev
->dev
;
2197 struct device
*parent
= dev
->parent
;
2200 pm_runtime_get_sync(parent
);
2201 pm_runtime_get_noresume(dev
);
2203 * pdev->current_state is set to PCI_D3cold during suspending,
2204 * so wait until suspending completes
2206 pm_runtime_barrier(dev
);
2208 * Only need to resume devices in D3cold, because config
2209 * registers are still accessible for devices suspended but
2212 if (pdev
->current_state
== PCI_D3cold
)
2213 pm_runtime_resume(dev
);
2216 void pci_config_pm_runtime_put(struct pci_dev
*pdev
)
2218 struct device
*dev
= &pdev
->dev
;
2219 struct device
*parent
= dev
->parent
;
2221 pm_runtime_put(dev
);
2223 pm_runtime_put_sync(parent
);
2227 * pci_bridge_d3_possible - Is it possible to put the bridge into D3
2228 * @bridge: Bridge to check
2230 * This function checks if it is possible to move the bridge to D3.
2231 * Currently we only allow D3 for recent enough PCIe ports.
2233 static bool pci_bridge_d3_possible(struct pci_dev
*bridge
)
2237 if (!pci_is_pcie(bridge
))
2240 switch (pci_pcie_type(bridge
)) {
2241 case PCI_EXP_TYPE_ROOT_PORT
:
2242 case PCI_EXP_TYPE_UPSTREAM
:
2243 case PCI_EXP_TYPE_DOWNSTREAM
:
2244 if (pci_bridge_d3_disable
)
2246 if (pci_bridge_d3_force
)
2250 * It should be safe to put PCIe ports from 2015 or newer
2253 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) &&
2263 static int pci_dev_check_d3cold(struct pci_dev
*dev
, void *data
)
2265 bool *d3cold_ok
= data
;
2269 * The device needs to be allowed to go D3cold and if it is wake
2270 * capable to do so from D3cold.
2272 no_d3cold
= dev
->no_d3cold
|| !dev
->d3cold_allowed
||
2273 (device_may_wakeup(&dev
->dev
) && !pci_pme_capable(dev
, PCI_D3cold
)) ||
2274 !pci_power_manageable(dev
);
2276 *d3cold_ok
= !no_d3cold
;
2282 * pci_bridge_d3_update - Update bridge D3 capabilities
2283 * @dev: PCI device which is changed
2284 * @remove: Is the device being removed
2286 * Update upstream bridge PM capabilities accordingly depending on if the
2287 * device PM configuration was changed or the device is being removed. The
2288 * change is also propagated upstream.
2290 static void pci_bridge_d3_update(struct pci_dev
*dev
, bool remove
)
2292 struct pci_dev
*bridge
;
2293 bool d3cold_ok
= true;
2295 bridge
= pci_upstream_bridge(dev
);
2296 if (!bridge
|| !pci_bridge_d3_possible(bridge
))
2300 * If the device is removed we do not care about its D3cold
2304 pci_dev_check_d3cold(dev
, &d3cold_ok
);
2308 * We need to go through all children to find out if all of
2309 * them can still go to D3cold.
2311 pci_walk_bus(bridge
->subordinate
, pci_dev_check_d3cold
,
2315 if (bridge
->bridge_d3
!= d3cold_ok
) {
2316 bridge
->bridge_d3
= d3cold_ok
;
2317 /* Propagate change to upstream bridges */
2318 pci_bridge_d3_update(bridge
, false);
2323 * pci_bridge_d3_device_changed - Update bridge D3 capabilities on change
2324 * @dev: PCI device that was changed
2326 * If a device is added or its PM configuration, such as is it allowed to
2327 * enter D3cold, is changed this function updates upstream bridge PM
2328 * capabilities accordingly.
2330 void pci_bridge_d3_device_changed(struct pci_dev
*dev
)
2332 pci_bridge_d3_update(dev
, false);
2336 * pci_bridge_d3_device_removed - Update bridge D3 capabilities on remove
2337 * @dev: PCI device being removed
2339 * Function updates upstream bridge PM capabilities based on other devices
2340 * still left on the bus.
2342 void pci_bridge_d3_device_removed(struct pci_dev
*dev
)
2344 pci_bridge_d3_update(dev
, true);
2348 * pci_d3cold_enable - Enable D3cold for device
2349 * @dev: PCI device to handle
2351 * This function can be used in drivers to enable D3cold from the device
2352 * they handle. It also updates upstream PCI bridge PM capabilities
2355 void pci_d3cold_enable(struct pci_dev
*dev
)
2357 if (dev
->no_d3cold
) {
2358 dev
->no_d3cold
= false;
2359 pci_bridge_d3_device_changed(dev
);
2362 EXPORT_SYMBOL_GPL(pci_d3cold_enable
);
2365 * pci_d3cold_disable - Disable D3cold for device
2366 * @dev: PCI device to handle
2368 * This function can be used in drivers to disable D3cold from the device
2369 * they handle. It also updates upstream PCI bridge PM capabilities
2372 void pci_d3cold_disable(struct pci_dev
*dev
)
2374 if (!dev
->no_d3cold
) {
2375 dev
->no_d3cold
= true;
2376 pci_bridge_d3_device_changed(dev
);
2379 EXPORT_SYMBOL_GPL(pci_d3cold_disable
);
2382 * pci_pm_init - Initialize PM functions of given PCI device
2383 * @dev: PCI device to handle.
2385 void pci_pm_init(struct pci_dev
*dev
)
2390 pm_runtime_forbid(&dev
->dev
);
2391 pm_runtime_set_active(&dev
->dev
);
2392 pm_runtime_enable(&dev
->dev
);
2393 device_enable_async_suspend(&dev
->dev
);
2394 dev
->wakeup_prepared
= false;
2397 dev
->pme_support
= 0;
2399 /* find PCI PM capability in list */
2400 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
2403 /* Check device's ability to generate PME# */
2404 pci_read_config_word(dev
, pm
+ PCI_PM_PMC
, &pmc
);
2406 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
2407 dev_err(&dev
->dev
, "unsupported PM cap regs version (%u)\n",
2408 pmc
& PCI_PM_CAP_VER_MASK
);
2413 dev
->d3_delay
= PCI_PM_D3_WAIT
;
2414 dev
->d3cold_delay
= PCI_PM_D3COLD_WAIT
;
2415 dev
->bridge_d3
= pci_bridge_d3_possible(dev
);
2416 dev
->d3cold_allowed
= true;
2418 dev
->d1_support
= false;
2419 dev
->d2_support
= false;
2420 if (!pci_no_d1d2(dev
)) {
2421 if (pmc
& PCI_PM_CAP_D1
)
2422 dev
->d1_support
= true;
2423 if (pmc
& PCI_PM_CAP_D2
)
2424 dev
->d2_support
= true;
2426 if (dev
->d1_support
|| dev
->d2_support
)
2427 dev_printk(KERN_DEBUG
, &dev
->dev
, "supports%s%s\n",
2428 dev
->d1_support
? " D1" : "",
2429 dev
->d2_support
? " D2" : "");
2432 pmc
&= PCI_PM_CAP_PME_MASK
;
2434 dev_printk(KERN_DEBUG
, &dev
->dev
,
2435 "PME# supported from%s%s%s%s%s\n",
2436 (pmc
& PCI_PM_CAP_PME_D0
) ? " D0" : "",
2437 (pmc
& PCI_PM_CAP_PME_D1
) ? " D1" : "",
2438 (pmc
& PCI_PM_CAP_PME_D2
) ? " D2" : "",
2439 (pmc
& PCI_PM_CAP_PME_D3
) ? " D3hot" : "",
2440 (pmc
& PCI_PM_CAP_PME_D3cold
) ? " D3cold" : "");
2441 dev
->pme_support
= pmc
>> PCI_PM_CAP_PME_SHIFT
;
2442 dev
->pme_poll
= true;
2444 * Make device's PM flags reflect the wake-up capability, but
2445 * let the user space enable it to wake up the system as needed.
2447 device_set_wakeup_capable(&dev
->dev
, true);
2448 /* Disable the PME# generation functionality */
2449 pci_pme_active(dev
, false);
2453 static unsigned long pci_ea_flags(struct pci_dev
*dev
, u8 prop
)
2455 unsigned long flags
= IORESOURCE_PCI_FIXED
| IORESOURCE_PCI_EA_BEI
;
2459 case PCI_EA_P_VF_MEM
:
2460 flags
|= IORESOURCE_MEM
;
2462 case PCI_EA_P_MEM_PREFETCH
:
2463 case PCI_EA_P_VF_MEM_PREFETCH
:
2464 flags
|= IORESOURCE_MEM
| IORESOURCE_PREFETCH
;
2467 flags
|= IORESOURCE_IO
;
2476 static struct resource
*pci_ea_get_resource(struct pci_dev
*dev
, u8 bei
,
2479 if (bei
<= PCI_EA_BEI_BAR5
&& prop
<= PCI_EA_P_IO
)
2480 return &dev
->resource
[bei
];
2481 #ifdef CONFIG_PCI_IOV
2482 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
&&
2483 (prop
== PCI_EA_P_VF_MEM
|| prop
== PCI_EA_P_VF_MEM_PREFETCH
))
2484 return &dev
->resource
[PCI_IOV_RESOURCES
+
2485 bei
- PCI_EA_BEI_VF_BAR0
];
2487 else if (bei
== PCI_EA_BEI_ROM
)
2488 return &dev
->resource
[PCI_ROM_RESOURCE
];
2493 /* Read an Enhanced Allocation (EA) entry */
2494 static int pci_ea_read(struct pci_dev
*dev
, int offset
)
2496 struct resource
*res
;
2497 int ent_size
, ent_offset
= offset
;
2498 resource_size_t start
, end
;
2499 unsigned long flags
;
2500 u32 dw0
, bei
, base
, max_offset
;
2502 bool support_64
= (sizeof(resource_size_t
) >= 8);
2504 pci_read_config_dword(dev
, ent_offset
, &dw0
);
2507 /* Entry size field indicates DWORDs after 1st */
2508 ent_size
= ((dw0
& PCI_EA_ES
) + 1) << 2;
2510 if (!(dw0
& PCI_EA_ENABLE
)) /* Entry not enabled */
2513 bei
= (dw0
& PCI_EA_BEI
) >> 4;
2514 prop
= (dw0
& PCI_EA_PP
) >> 8;
2517 * If the Property is in the reserved range, try the Secondary
2520 if (prop
> PCI_EA_P_BRIDGE_IO
&& prop
< PCI_EA_P_MEM_RESERVED
)
2521 prop
= (dw0
& PCI_EA_SP
) >> 16;
2522 if (prop
> PCI_EA_P_BRIDGE_IO
)
2525 res
= pci_ea_get_resource(dev
, bei
, prop
);
2527 dev_err(&dev
->dev
, "Unsupported EA entry BEI: %u\n", bei
);
2531 flags
= pci_ea_flags(dev
, prop
);
2533 dev_err(&dev
->dev
, "Unsupported EA properties: %#x\n", prop
);
2538 pci_read_config_dword(dev
, ent_offset
, &base
);
2539 start
= (base
& PCI_EA_FIELD_MASK
);
2542 /* Read MaxOffset */
2543 pci_read_config_dword(dev
, ent_offset
, &max_offset
);
2546 /* Read Base MSBs (if 64-bit entry) */
2547 if (base
& PCI_EA_IS_64
) {
2550 pci_read_config_dword(dev
, ent_offset
, &base_upper
);
2553 flags
|= IORESOURCE_MEM_64
;
2555 /* entry starts above 32-bit boundary, can't use */
2556 if (!support_64
&& base_upper
)
2560 start
|= ((u64
)base_upper
<< 32);
2563 end
= start
+ (max_offset
| 0x03);
2565 /* Read MaxOffset MSBs (if 64-bit entry) */
2566 if (max_offset
& PCI_EA_IS_64
) {
2567 u32 max_offset_upper
;
2569 pci_read_config_dword(dev
, ent_offset
, &max_offset_upper
);
2572 flags
|= IORESOURCE_MEM_64
;
2574 /* entry too big, can't use */
2575 if (!support_64
&& max_offset_upper
)
2579 end
+= ((u64
)max_offset_upper
<< 32);
2583 dev_err(&dev
->dev
, "EA Entry crosses address boundary\n");
2587 if (ent_size
!= ent_offset
- offset
) {
2589 "EA Entry Size (%d) does not match length read (%d)\n",
2590 ent_size
, ent_offset
- offset
);
2594 res
->name
= pci_name(dev
);
2599 if (bei
<= PCI_EA_BEI_BAR5
)
2600 dev_printk(KERN_DEBUG
, &dev
->dev
, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2602 else if (bei
== PCI_EA_BEI_ROM
)
2603 dev_printk(KERN_DEBUG
, &dev
->dev
, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n",
2605 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
)
2606 dev_printk(KERN_DEBUG
, &dev
->dev
, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2607 bei
- PCI_EA_BEI_VF_BAR0
, res
, prop
);
2609 dev_printk(KERN_DEBUG
, &dev
->dev
, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n",
2613 return offset
+ ent_size
;
2616 /* Enhanced Allocation Initialization */
2617 void pci_ea_init(struct pci_dev
*dev
)
2624 /* find PCI EA capability in list */
2625 ea
= pci_find_capability(dev
, PCI_CAP_ID_EA
);
2629 /* determine the number of entries */
2630 pci_bus_read_config_byte(dev
->bus
, dev
->devfn
, ea
+ PCI_EA_NUM_ENT
,
2632 num_ent
&= PCI_EA_NUM_ENT_MASK
;
2634 offset
= ea
+ PCI_EA_FIRST_ENT
;
2636 /* Skip DWORD 2 for type 1 functions */
2637 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
)
2640 /* parse each EA entry */
2641 for (i
= 0; i
< num_ent
; ++i
)
2642 offset
= pci_ea_read(dev
, offset
);
2645 static void pci_add_saved_cap(struct pci_dev
*pci_dev
,
2646 struct pci_cap_saved_state
*new_cap
)
2648 hlist_add_head(&new_cap
->next
, &pci_dev
->saved_cap_space
);
2652 * _pci_add_cap_save_buffer - allocate buffer for saving given
2653 * capability registers
2654 * @dev: the PCI device
2655 * @cap: the capability to allocate the buffer for
2656 * @extended: Standard or Extended capability ID
2657 * @size: requested size of the buffer
2659 static int _pci_add_cap_save_buffer(struct pci_dev
*dev
, u16 cap
,
2660 bool extended
, unsigned int size
)
2663 struct pci_cap_saved_state
*save_state
;
2666 pos
= pci_find_ext_capability(dev
, cap
);
2668 pos
= pci_find_capability(dev
, cap
);
2673 save_state
= kzalloc(sizeof(*save_state
) + size
, GFP_KERNEL
);
2677 save_state
->cap
.cap_nr
= cap
;
2678 save_state
->cap
.cap_extended
= extended
;
2679 save_state
->cap
.size
= size
;
2680 pci_add_saved_cap(dev
, save_state
);
2685 int pci_add_cap_save_buffer(struct pci_dev
*dev
, char cap
, unsigned int size
)
2687 return _pci_add_cap_save_buffer(dev
, cap
, false, size
);
2690 int pci_add_ext_cap_save_buffer(struct pci_dev
*dev
, u16 cap
, unsigned int size
)
2692 return _pci_add_cap_save_buffer(dev
, cap
, true, size
);
2696 * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
2697 * @dev: the PCI device
2699 void pci_allocate_cap_save_buffers(struct pci_dev
*dev
)
2703 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_EXP
,
2704 PCI_EXP_SAVE_REGS
* sizeof(u16
));
2707 "unable to preallocate PCI Express save buffer\n");
2709 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_PCIX
, sizeof(u16
));
2712 "unable to preallocate PCI-X save buffer\n");
2714 pci_allocate_vc_save_buffers(dev
);
2717 void pci_free_cap_save_buffers(struct pci_dev
*dev
)
2719 struct pci_cap_saved_state
*tmp
;
2720 struct hlist_node
*n
;
2722 hlist_for_each_entry_safe(tmp
, n
, &dev
->saved_cap_space
, next
)
2727 * pci_configure_ari - enable or disable ARI forwarding
2728 * @dev: the PCI device
2730 * If @dev and its upstream bridge both support ARI, enable ARI in the
2731 * bridge. Otherwise, disable ARI in the bridge.
2733 void pci_configure_ari(struct pci_dev
*dev
)
2736 struct pci_dev
*bridge
;
2738 if (pcie_ari_disabled
|| !pci_is_pcie(dev
) || dev
->devfn
)
2741 bridge
= dev
->bus
->self
;
2745 pcie_capability_read_dword(bridge
, PCI_EXP_DEVCAP2
, &cap
);
2746 if (!(cap
& PCI_EXP_DEVCAP2_ARI
))
2749 if (pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
)) {
2750 pcie_capability_set_word(bridge
, PCI_EXP_DEVCTL2
,
2751 PCI_EXP_DEVCTL2_ARI
);
2752 bridge
->ari_enabled
= 1;
2754 pcie_capability_clear_word(bridge
, PCI_EXP_DEVCTL2
,
2755 PCI_EXP_DEVCTL2_ARI
);
2756 bridge
->ari_enabled
= 0;
2760 static int pci_acs_enable
;
2763 * pci_request_acs - ask for ACS to be enabled if supported
2765 void pci_request_acs(void)
2771 * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites
2772 * @dev: the PCI device
2774 static void pci_std_enable_acs(struct pci_dev
*dev
)
2780 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ACS
);
2784 pci_read_config_word(dev
, pos
+ PCI_ACS_CAP
, &cap
);
2785 pci_read_config_word(dev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2787 /* Source Validation */
2788 ctrl
|= (cap
& PCI_ACS_SV
);
2790 /* P2P Request Redirect */
2791 ctrl
|= (cap
& PCI_ACS_RR
);
2793 /* P2P Completion Redirect */
2794 ctrl
|= (cap
& PCI_ACS_CR
);
2796 /* Upstream Forwarding */
2797 ctrl
|= (cap
& PCI_ACS_UF
);
2799 pci_write_config_word(dev
, pos
+ PCI_ACS_CTRL
, ctrl
);
2803 * pci_enable_acs - enable ACS if hardware support it
2804 * @dev: the PCI device
2806 void pci_enable_acs(struct pci_dev
*dev
)
2808 if (!pci_acs_enable
)
2811 if (!pci_dev_specific_enable_acs(dev
))
2814 pci_std_enable_acs(dev
);
2817 static bool pci_acs_flags_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2822 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_ACS
);
2827 * Except for egress control, capabilities are either required
2828 * or only required if controllable. Features missing from the
2829 * capability field can therefore be assumed as hard-wired enabled.
2831 pci_read_config_word(pdev
, pos
+ PCI_ACS_CAP
, &cap
);
2832 acs_flags
&= (cap
| PCI_ACS_EC
);
2834 pci_read_config_word(pdev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2835 return (ctrl
& acs_flags
) == acs_flags
;
2839 * pci_acs_enabled - test ACS against required flags for a given device
2840 * @pdev: device to test
2841 * @acs_flags: required PCI ACS flags
2843 * Return true if the device supports the provided flags. Automatically
2844 * filters out flags that are not implemented on multifunction devices.
2846 * Note that this interface checks the effective ACS capabilities of the
2847 * device rather than the actual capabilities. For instance, most single
2848 * function endpoints are not required to support ACS because they have no
2849 * opportunity for peer-to-peer access. We therefore return 'true'
2850 * regardless of whether the device exposes an ACS capability. This makes
2851 * it much easier for callers of this function to ignore the actual type
2852 * or topology of the device when testing ACS support.
2854 bool pci_acs_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2858 ret
= pci_dev_specific_acs_enabled(pdev
, acs_flags
);
2863 * Conventional PCI and PCI-X devices never support ACS, either
2864 * effectively or actually. The shared bus topology implies that
2865 * any device on the bus can receive or snoop DMA.
2867 if (!pci_is_pcie(pdev
))
2870 switch (pci_pcie_type(pdev
)) {
2872 * PCI/X-to-PCIe bridges are not specifically mentioned by the spec,
2873 * but since their primary interface is PCI/X, we conservatively
2874 * handle them as we would a non-PCIe device.
2876 case PCI_EXP_TYPE_PCIE_BRIDGE
:
2878 * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never
2879 * applicable... must never implement an ACS Extended Capability...".
2880 * This seems arbitrary, but we take a conservative interpretation
2881 * of this statement.
2883 case PCI_EXP_TYPE_PCI_BRIDGE
:
2884 case PCI_EXP_TYPE_RC_EC
:
2887 * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should
2888 * implement ACS in order to indicate their peer-to-peer capabilities,
2889 * regardless of whether they are single- or multi-function devices.
2891 case PCI_EXP_TYPE_DOWNSTREAM
:
2892 case PCI_EXP_TYPE_ROOT_PORT
:
2893 return pci_acs_flags_enabled(pdev
, acs_flags
);
2895 * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be
2896 * implemented by the remaining PCIe types to indicate peer-to-peer
2897 * capabilities, but only when they are part of a multifunction
2898 * device. The footnote for section 6.12 indicates the specific
2899 * PCIe types included here.
2901 case PCI_EXP_TYPE_ENDPOINT
:
2902 case PCI_EXP_TYPE_UPSTREAM
:
2903 case PCI_EXP_TYPE_LEG_END
:
2904 case PCI_EXP_TYPE_RC_END
:
2905 if (!pdev
->multifunction
)
2908 return pci_acs_flags_enabled(pdev
, acs_flags
);
2912 * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable
2913 * to single function devices with the exception of downstream ports.
2919 * pci_acs_path_enable - test ACS flags from start to end in a hierarchy
2920 * @start: starting downstream device
2921 * @end: ending upstream device or NULL to search to the root bus
2922 * @acs_flags: required flags
2924 * Walk up a device tree from start to end testing PCI ACS support. If
2925 * any step along the way does not support the required flags, return false.
2927 bool pci_acs_path_enabled(struct pci_dev
*start
,
2928 struct pci_dev
*end
, u16 acs_flags
)
2930 struct pci_dev
*pdev
, *parent
= start
;
2935 if (!pci_acs_enabled(pdev
, acs_flags
))
2938 if (pci_is_root_bus(pdev
->bus
))
2939 return (end
== NULL
);
2941 parent
= pdev
->bus
->self
;
2942 } while (pdev
!= end
);
2948 * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
2949 * @dev: the PCI device
2950 * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
2952 * Perform INTx swizzling for a device behind one level of bridge. This is
2953 * required by section 9.1 of the PCI-to-PCI bridge specification for devices
2954 * behind bridges on add-in cards. For devices with ARI enabled, the slot
2955 * number is always 0 (see the Implementation Note in section 2.2.8.1 of
2956 * the PCI Express Base Specification, Revision 2.1)
2958 u8
pci_swizzle_interrupt_pin(const struct pci_dev
*dev
, u8 pin
)
2962 if (pci_ari_enabled(dev
->bus
))
2965 slot
= PCI_SLOT(dev
->devfn
);
2967 return (((pin
- 1) + slot
) % 4) + 1;
2970 int pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
2978 while (!pci_is_root_bus(dev
->bus
)) {
2979 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2980 dev
= dev
->bus
->self
;
2987 * pci_common_swizzle - swizzle INTx all the way to root bridge
2988 * @dev: the PCI device
2989 * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
2991 * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
2992 * bridges all the way up to a PCI root bus.
2994 u8
pci_common_swizzle(struct pci_dev
*dev
, u8
*pinp
)
2998 while (!pci_is_root_bus(dev
->bus
)) {
2999 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
3000 dev
= dev
->bus
->self
;
3003 return PCI_SLOT(dev
->devfn
);
3005 EXPORT_SYMBOL_GPL(pci_common_swizzle
);
3008 * pci_release_region - Release a PCI bar
3009 * @pdev: PCI device whose resources were previously reserved by pci_request_region
3010 * @bar: BAR to release
3012 * Releases the PCI I/O and memory resources previously reserved by a
3013 * successful call to pci_request_region. Call this function only
3014 * after all use of the PCI regions has ceased.
3016 void pci_release_region(struct pci_dev
*pdev
, int bar
)
3018 struct pci_devres
*dr
;
3020 if (pci_resource_len(pdev
, bar
) == 0)
3022 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
3023 release_region(pci_resource_start(pdev
, bar
),
3024 pci_resource_len(pdev
, bar
));
3025 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
3026 release_mem_region(pci_resource_start(pdev
, bar
),
3027 pci_resource_len(pdev
, bar
));
3029 dr
= find_pci_dr(pdev
);
3031 dr
->region_mask
&= ~(1 << bar
);
3033 EXPORT_SYMBOL(pci_release_region
);
3036 * __pci_request_region - Reserved PCI I/O and memory resource
3037 * @pdev: PCI device whose resources are to be reserved
3038 * @bar: BAR to be reserved
3039 * @res_name: Name to be associated with resource.
3040 * @exclusive: whether the region access is exclusive or not
3042 * Mark the PCI region associated with PCI device @pdev BR @bar as
3043 * being reserved by owner @res_name. Do not access any
3044 * address inside the PCI regions unless this call returns
3047 * If @exclusive is set, then the region is marked so that userspace
3048 * is explicitly not allowed to map the resource via /dev/mem or
3049 * sysfs MMIO access.
3051 * Returns 0 on success, or %EBUSY on error. A warning
3052 * message is also printed on failure.
3054 static int __pci_request_region(struct pci_dev
*pdev
, int bar
,
3055 const char *res_name
, int exclusive
)
3057 struct pci_devres
*dr
;
3059 if (pci_resource_len(pdev
, bar
) == 0)
3062 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
3063 if (!request_region(pci_resource_start(pdev
, bar
),
3064 pci_resource_len(pdev
, bar
), res_name
))
3066 } else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
3067 if (!__request_mem_region(pci_resource_start(pdev
, bar
),
3068 pci_resource_len(pdev
, bar
), res_name
,
3073 dr
= find_pci_dr(pdev
);
3075 dr
->region_mask
|= 1 << bar
;
3080 dev_warn(&pdev
->dev
, "BAR %d: can't reserve %pR\n", bar
,
3081 &pdev
->resource
[bar
]);
3086 * pci_request_region - Reserve PCI I/O and memory resource
3087 * @pdev: PCI device whose resources are to be reserved
3088 * @bar: BAR to be reserved
3089 * @res_name: Name to be associated with resource
3091 * Mark the PCI region associated with PCI device @pdev BAR @bar as
3092 * being reserved by owner @res_name. Do not access any
3093 * address inside the PCI regions unless this call returns
3096 * Returns 0 on success, or %EBUSY on error. A warning
3097 * message is also printed on failure.
3099 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
3101 return __pci_request_region(pdev
, bar
, res_name
, 0);
3103 EXPORT_SYMBOL(pci_request_region
);
3106 * pci_request_region_exclusive - Reserved PCI I/O and memory resource
3107 * @pdev: PCI device whose resources are to be reserved
3108 * @bar: BAR to be reserved
3109 * @res_name: Name to be associated with resource.
3111 * Mark the PCI region associated with PCI device @pdev BR @bar as
3112 * being reserved by owner @res_name. Do not access any
3113 * address inside the PCI regions unless this call returns
3116 * Returns 0 on success, or %EBUSY on error. A warning
3117 * message is also printed on failure.
3119 * The key difference that _exclusive makes it that userspace is
3120 * explicitly not allowed to map the resource via /dev/mem or
3123 int pci_request_region_exclusive(struct pci_dev
*pdev
, int bar
,
3124 const char *res_name
)
3126 return __pci_request_region(pdev
, bar
, res_name
, IORESOURCE_EXCLUSIVE
);
3128 EXPORT_SYMBOL(pci_request_region_exclusive
);
3131 * pci_release_selected_regions - Release selected PCI I/O and memory resources
3132 * @pdev: PCI device whose resources were previously reserved
3133 * @bars: Bitmask of BARs to be released
3135 * Release selected PCI I/O and memory resources previously reserved.
3136 * Call this function only after all use of the PCI regions has ceased.
3138 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
3142 for (i
= 0; i
< 6; i
++)
3143 if (bars
& (1 << i
))
3144 pci_release_region(pdev
, i
);
3146 EXPORT_SYMBOL(pci_release_selected_regions
);
3148 static int __pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3149 const char *res_name
, int excl
)
3153 for (i
= 0; i
< 6; i
++)
3154 if (bars
& (1 << i
))
3155 if (__pci_request_region(pdev
, i
, res_name
, excl
))
3161 if (bars
& (1 << i
))
3162 pci_release_region(pdev
, i
);
3169 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
3170 * @pdev: PCI device whose resources are to be reserved
3171 * @bars: Bitmask of BARs to be requested
3172 * @res_name: Name to be associated with resource
3174 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3175 const char *res_name
)
3177 return __pci_request_selected_regions(pdev
, bars
, res_name
, 0);
3179 EXPORT_SYMBOL(pci_request_selected_regions
);
3181 int pci_request_selected_regions_exclusive(struct pci_dev
*pdev
, int bars
,
3182 const char *res_name
)
3184 return __pci_request_selected_regions(pdev
, bars
, res_name
,
3185 IORESOURCE_EXCLUSIVE
);
3187 EXPORT_SYMBOL(pci_request_selected_regions_exclusive
);
3190 * pci_release_regions - Release reserved PCI I/O and memory resources
3191 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
3193 * Releases all PCI I/O and memory resources previously reserved by a
3194 * successful call to pci_request_regions. Call this function only
3195 * after all use of the PCI regions has ceased.
3198 void pci_release_regions(struct pci_dev
*pdev
)
3200 pci_release_selected_regions(pdev
, (1 << 6) - 1);
3202 EXPORT_SYMBOL(pci_release_regions
);
3205 * pci_request_regions - Reserved PCI I/O and memory resources
3206 * @pdev: PCI device whose resources are to be reserved
3207 * @res_name: Name to be associated with resource.
3209 * Mark all PCI regions associated with PCI device @pdev as
3210 * being reserved by owner @res_name. Do not access any
3211 * address inside the PCI regions unless this call returns
3214 * Returns 0 on success, or %EBUSY on error. A warning
3215 * message is also printed on failure.
3217 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
3219 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
3221 EXPORT_SYMBOL(pci_request_regions
);
3224 * pci_request_regions_exclusive - Reserved PCI I/O and memory resources
3225 * @pdev: PCI device whose resources are to be reserved
3226 * @res_name: Name to be associated with resource.
3228 * Mark all PCI regions associated with PCI device @pdev as
3229 * being reserved by owner @res_name. Do not access any
3230 * address inside the PCI regions unless this call returns
3233 * pci_request_regions_exclusive() will mark the region so that
3234 * /dev/mem and the sysfs MMIO access will not be allowed.
3236 * Returns 0 on success, or %EBUSY on error. A warning
3237 * message is also printed on failure.
3239 int pci_request_regions_exclusive(struct pci_dev
*pdev
, const char *res_name
)
3241 return pci_request_selected_regions_exclusive(pdev
,
3242 ((1 << 6) - 1), res_name
);
3244 EXPORT_SYMBOL(pci_request_regions_exclusive
);
3248 struct list_head list
;
3250 resource_size_t size
;
3253 static LIST_HEAD(io_range_list
);
3254 static DEFINE_SPINLOCK(io_range_lock
);
3258 * Record the PCI IO range (expressed as CPU physical address + size).
3259 * Return a negative value if an error has occured, zero otherwise
3261 int __weak
pci_register_io_range(phys_addr_t addr
, resource_size_t size
)
3266 struct io_range
*range
;
3267 resource_size_t allocated_size
= 0;
3269 /* check if the range hasn't been previously recorded */
3270 spin_lock(&io_range_lock
);
3271 list_for_each_entry(range
, &io_range_list
, list
) {
3272 if (addr
>= range
->start
&& addr
+ size
<= range
->start
+ size
) {
3273 /* range already registered, bail out */
3276 allocated_size
+= range
->size
;
3279 /* range not registed yet, check for available space */
3280 if (allocated_size
+ size
- 1 > IO_SPACE_LIMIT
) {
3281 /* if it's too big check if 64K space can be reserved */
3282 if (allocated_size
+ SZ_64K
- 1 > IO_SPACE_LIMIT
) {
3288 pr_warn("Requested IO range too big, new size set to 64K\n");
3291 /* add the range to the list */
3292 range
= kzalloc(sizeof(*range
), GFP_ATOMIC
);
3298 range
->start
= addr
;
3301 list_add_tail(&range
->list
, &io_range_list
);
3304 spin_unlock(&io_range_lock
);
3310 phys_addr_t
pci_pio_to_address(unsigned long pio
)
3312 phys_addr_t address
= (phys_addr_t
)OF_BAD_ADDR
;
3315 struct io_range
*range
;
3316 resource_size_t allocated_size
= 0;
3318 if (pio
> IO_SPACE_LIMIT
)
3321 spin_lock(&io_range_lock
);
3322 list_for_each_entry(range
, &io_range_list
, list
) {
3323 if (pio
>= allocated_size
&& pio
< allocated_size
+ range
->size
) {
3324 address
= range
->start
+ pio
- allocated_size
;
3327 allocated_size
+= range
->size
;
3329 spin_unlock(&io_range_lock
);
3335 unsigned long __weak
pci_address_to_pio(phys_addr_t address
)
3338 struct io_range
*res
;
3339 resource_size_t offset
= 0;
3340 unsigned long addr
= -1;
3342 spin_lock(&io_range_lock
);
3343 list_for_each_entry(res
, &io_range_list
, list
) {
3344 if (address
>= res
->start
&& address
< res
->start
+ res
->size
) {
3345 addr
= address
- res
->start
+ offset
;
3348 offset
+= res
->size
;
3350 spin_unlock(&io_range_lock
);
3354 if (address
> IO_SPACE_LIMIT
)
3355 return (unsigned long)-1;
3357 return (unsigned long) address
;
3362 * pci_remap_iospace - Remap the memory mapped I/O space
3363 * @res: Resource describing the I/O space
3364 * @phys_addr: physical address of range to be mapped
3366 * Remap the memory mapped I/O space described by the @res
3367 * and the CPU physical address @phys_addr into virtual address space.
3368 * Only architectures that have memory mapped IO functions defined
3369 * (and the PCI_IOBASE value defined) should call this function.
3371 int __weak
pci_remap_iospace(const struct resource
*res
, phys_addr_t phys_addr
)
3373 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3374 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3376 if (!(res
->flags
& IORESOURCE_IO
))
3379 if (res
->end
> IO_SPACE_LIMIT
)
3382 return ioremap_page_range(vaddr
, vaddr
+ resource_size(res
), phys_addr
,
3383 pgprot_device(PAGE_KERNEL
));
3385 /* this architecture does not have memory mapped I/O space,
3386 so this function should never be called */
3387 WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
3393 * pci_unmap_iospace - Unmap the memory mapped I/O space
3394 * @res: resource to be unmapped
3396 * Unmap the CPU virtual address @res from virtual address space.
3397 * Only architectures that have memory mapped IO functions defined
3398 * (and the PCI_IOBASE value defined) should call this function.
3400 void pci_unmap_iospace(struct resource
*res
)
3402 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3403 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3405 unmap_kernel_range(vaddr
, resource_size(res
));
3409 static void __pci_set_master(struct pci_dev
*dev
, bool enable
)
3413 pci_read_config_word(dev
, PCI_COMMAND
, &old_cmd
);
3415 cmd
= old_cmd
| PCI_COMMAND_MASTER
;
3417 cmd
= old_cmd
& ~PCI_COMMAND_MASTER
;
3418 if (cmd
!= old_cmd
) {
3419 dev_dbg(&dev
->dev
, "%s bus mastering\n",
3420 enable
? "enabling" : "disabling");
3421 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3423 dev
->is_busmaster
= enable
;
3427 * pcibios_setup - process "pci=" kernel boot arguments
3428 * @str: string used to pass in "pci=" kernel boot arguments
3430 * Process kernel boot arguments. This is the default implementation.
3431 * Architecture specific implementations can override this as necessary.
3433 char * __weak __init
pcibios_setup(char *str
)
3439 * pcibios_set_master - enable PCI bus-mastering for device dev
3440 * @dev: the PCI device to enable
3442 * Enables PCI bus-mastering for the device. This is the default
3443 * implementation. Architecture specific implementations can override
3444 * this if necessary.
3446 void __weak
pcibios_set_master(struct pci_dev
*dev
)
3450 /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
3451 if (pci_is_pcie(dev
))
3454 pci_read_config_byte(dev
, PCI_LATENCY_TIMER
, &lat
);
3456 lat
= (64 <= pcibios_max_latency
) ? 64 : pcibios_max_latency
;
3457 else if (lat
> pcibios_max_latency
)
3458 lat
= pcibios_max_latency
;
3462 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, lat
);
3466 * pci_set_master - enables bus-mastering for device dev
3467 * @dev: the PCI device to enable
3469 * Enables bus-mastering on the device and calls pcibios_set_master()
3470 * to do the needed arch specific settings.
3472 void pci_set_master(struct pci_dev
*dev
)
3474 __pci_set_master(dev
, true);
3475 pcibios_set_master(dev
);
3477 EXPORT_SYMBOL(pci_set_master
);
3480 * pci_clear_master - disables bus-mastering for device dev
3481 * @dev: the PCI device to disable
3483 void pci_clear_master(struct pci_dev
*dev
)
3485 __pci_set_master(dev
, false);
3487 EXPORT_SYMBOL(pci_clear_master
);
3490 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
3491 * @dev: the PCI device for which MWI is to be enabled
3493 * Helper function for pci_set_mwi.
3494 * Originally copied from drivers/net/acenic.c.
3495 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
3497 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3499 int pci_set_cacheline_size(struct pci_dev
*dev
)
3503 if (!pci_cache_line_size
)
3506 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
3507 equal to or multiple of the right value. */
3508 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3509 if (cacheline_size
>= pci_cache_line_size
&&
3510 (cacheline_size
% pci_cache_line_size
) == 0)
3513 /* Write the correct value. */
3514 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
3516 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3517 if (cacheline_size
== pci_cache_line_size
)
3520 dev_printk(KERN_DEBUG
, &dev
->dev
, "cache line size of %d is not supported\n",
3521 pci_cache_line_size
<< 2);
3525 EXPORT_SYMBOL_GPL(pci_set_cacheline_size
);
3528 * pci_set_mwi - enables memory-write-invalidate PCI transaction
3529 * @dev: the PCI device for which MWI is enabled
3531 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3533 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3535 int pci_set_mwi(struct pci_dev
*dev
)
3537 #ifdef PCI_DISABLE_MWI
3543 rc
= pci_set_cacheline_size(dev
);
3547 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3548 if (!(cmd
& PCI_COMMAND_INVALIDATE
)) {
3549 dev_dbg(&dev
->dev
, "enabling Mem-Wr-Inval\n");
3550 cmd
|= PCI_COMMAND_INVALIDATE
;
3551 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3556 EXPORT_SYMBOL(pci_set_mwi
);
3559 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
3560 * @dev: the PCI device for which MWI is enabled
3562 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3563 * Callers are not required to check the return value.
3565 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3567 int pci_try_set_mwi(struct pci_dev
*dev
)
3569 #ifdef PCI_DISABLE_MWI
3572 return pci_set_mwi(dev
);
3575 EXPORT_SYMBOL(pci_try_set_mwi
);
3578 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
3579 * @dev: the PCI device to disable
3581 * Disables PCI Memory-Write-Invalidate transaction on the device
3583 void pci_clear_mwi(struct pci_dev
*dev
)
3585 #ifndef PCI_DISABLE_MWI
3588 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3589 if (cmd
& PCI_COMMAND_INVALIDATE
) {
3590 cmd
&= ~PCI_COMMAND_INVALIDATE
;
3591 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3595 EXPORT_SYMBOL(pci_clear_mwi
);
3598 * pci_intx - enables/disables PCI INTx for device dev
3599 * @pdev: the PCI device to operate on
3600 * @enable: boolean: whether to enable or disable PCI INTx
3602 * Enables/disables PCI INTx for device dev
3604 void pci_intx(struct pci_dev
*pdev
, int enable
)
3606 u16 pci_command
, new;
3608 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
3611 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
3613 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
3615 if (new != pci_command
) {
3616 struct pci_devres
*dr
;
3618 pci_write_config_word(pdev
, PCI_COMMAND
, new);
3620 dr
= find_pci_dr(pdev
);
3621 if (dr
&& !dr
->restore_intx
) {
3622 dr
->restore_intx
= 1;
3623 dr
->orig_intx
= !enable
;
3627 EXPORT_SYMBOL_GPL(pci_intx
);
3630 * pci_intx_mask_supported - probe for INTx masking support
3631 * @dev: the PCI device to operate on
3633 * Check if the device dev support INTx masking via the config space
3636 bool pci_intx_mask_supported(struct pci_dev
*dev
)
3638 bool mask_supported
= false;
3641 if (dev
->broken_intx_masking
)
3644 pci_cfg_access_lock(dev
);
3646 pci_read_config_word(dev
, PCI_COMMAND
, &orig
);
3647 pci_write_config_word(dev
, PCI_COMMAND
,
3648 orig
^ PCI_COMMAND_INTX_DISABLE
);
3649 pci_read_config_word(dev
, PCI_COMMAND
, &new);
3652 * There's no way to protect against hardware bugs or detect them
3653 * reliably, but as long as we know what the value should be, let's
3654 * go ahead and check it.
3656 if ((new ^ orig
) & ~PCI_COMMAND_INTX_DISABLE
) {
3657 dev_err(&dev
->dev
, "Command register changed from 0x%x to 0x%x: driver or hardware bug?\n",
3659 } else if ((new ^ orig
) & PCI_COMMAND_INTX_DISABLE
) {
3660 mask_supported
= true;
3661 pci_write_config_word(dev
, PCI_COMMAND
, orig
);
3664 pci_cfg_access_unlock(dev
);
3665 return mask_supported
;
3667 EXPORT_SYMBOL_GPL(pci_intx_mask_supported
);
3669 static bool pci_check_and_set_intx_mask(struct pci_dev
*dev
, bool mask
)
3671 struct pci_bus
*bus
= dev
->bus
;
3672 bool mask_updated
= true;
3673 u32 cmd_status_dword
;
3674 u16 origcmd
, newcmd
;
3675 unsigned long flags
;
3679 * We do a single dword read to retrieve both command and status.
3680 * Document assumptions that make this possible.
3682 BUILD_BUG_ON(PCI_COMMAND
% 4);
3683 BUILD_BUG_ON(PCI_COMMAND
+ 2 != PCI_STATUS
);
3685 raw_spin_lock_irqsave(&pci_lock
, flags
);
3687 bus
->ops
->read(bus
, dev
->devfn
, PCI_COMMAND
, 4, &cmd_status_dword
);
3689 irq_pending
= (cmd_status_dword
>> 16) & PCI_STATUS_INTERRUPT
;
3692 * Check interrupt status register to see whether our device
3693 * triggered the interrupt (when masking) or the next IRQ is
3694 * already pending (when unmasking).
3696 if (mask
!= irq_pending
) {
3697 mask_updated
= false;
3701 origcmd
= cmd_status_dword
;
3702 newcmd
= origcmd
& ~PCI_COMMAND_INTX_DISABLE
;
3704 newcmd
|= PCI_COMMAND_INTX_DISABLE
;
3705 if (newcmd
!= origcmd
)
3706 bus
->ops
->write(bus
, dev
->devfn
, PCI_COMMAND
, 2, newcmd
);
3709 raw_spin_unlock_irqrestore(&pci_lock
, flags
);
3711 return mask_updated
;
3715 * pci_check_and_mask_intx - mask INTx on pending interrupt
3716 * @dev: the PCI device to operate on
3718 * Check if the device dev has its INTx line asserted, mask it and
3719 * return true in that case. False is returned if not interrupt was
3722 bool pci_check_and_mask_intx(struct pci_dev
*dev
)
3724 return pci_check_and_set_intx_mask(dev
, true);
3726 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx
);
3729 * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
3730 * @dev: the PCI device to operate on
3732 * Check if the device dev has its INTx line asserted, unmask it if not
3733 * and return true. False is returned and the mask remains active if
3734 * there was still an interrupt pending.
3736 bool pci_check_and_unmask_intx(struct pci_dev
*dev
)
3738 return pci_check_and_set_intx_mask(dev
, false);
3740 EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx
);
3743 * pci_wait_for_pending_transaction - waits for pending transaction
3744 * @dev: the PCI device to operate on
3746 * Return 0 if transaction is pending 1 otherwise.
3748 int pci_wait_for_pending_transaction(struct pci_dev
*dev
)
3750 if (!pci_is_pcie(dev
))
3753 return pci_wait_for_pending(dev
, pci_pcie_cap(dev
) + PCI_EXP_DEVSTA
,
3754 PCI_EXP_DEVSTA_TRPND
);
3756 EXPORT_SYMBOL(pci_wait_for_pending_transaction
);
3759 * We should only need to wait 100ms after FLR, but some devices take longer.
3760 * Wait for up to 1000ms for config space to return something other than -1.
3761 * Intel IGD requires this when an LCD panel is attached. We read the 2nd
3762 * dword because VFs don't implement the 1st dword.
3764 static void pci_flr_wait(struct pci_dev
*dev
)
3771 pci_read_config_dword(dev
, PCI_COMMAND
, &id
);
3772 } while (i
++ < 10 && id
== ~0);
3775 dev_warn(&dev
->dev
, "Failed to return from FLR\n");
3777 dev_info(&dev
->dev
, "Required additional %dms to return from FLR\n",
3781 static int pcie_flr(struct pci_dev
*dev
, int probe
)
3785 pcie_capability_read_dword(dev
, PCI_EXP_DEVCAP
, &cap
);
3786 if (!(cap
& PCI_EXP_DEVCAP_FLR
))
3792 if (!pci_wait_for_pending_transaction(dev
))
3793 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing function level reset anyway\n");
3795 pcie_capability_set_word(dev
, PCI_EXP_DEVCTL
, PCI_EXP_DEVCTL_BCR_FLR
);
3800 static int pci_af_flr(struct pci_dev
*dev
, int probe
)
3805 pos
= pci_find_capability(dev
, PCI_CAP_ID_AF
);
3809 pci_read_config_byte(dev
, pos
+ PCI_AF_CAP
, &cap
);
3810 if (!(cap
& PCI_AF_CAP_TP
) || !(cap
& PCI_AF_CAP_FLR
))
3817 * Wait for Transaction Pending bit to clear. A word-aligned test
3818 * is used, so we use the conrol offset rather than status and shift
3819 * the test bit to match.
3821 if (!pci_wait_for_pending(dev
, pos
+ PCI_AF_CTRL
,
3822 PCI_AF_STATUS_TP
<< 8))
3823 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
3825 pci_write_config_byte(dev
, pos
+ PCI_AF_CTRL
, PCI_AF_CTRL_FLR
);
3831 * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
3832 * @dev: Device to reset.
3833 * @probe: If set, only check if the device can be reset this way.
3835 * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
3836 * unset, it will be reinitialized internally when going from PCI_D3hot to
3837 * PCI_D0. If that's the case and the device is not in a low-power state
3838 * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
3840 * NOTE: This causes the caller to sleep for twice the device power transition
3841 * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
3842 * by default (i.e. unless the @dev's d3_delay field has a different value).
3843 * Moreover, only devices in D0 can be reset by this function.
3845 static int pci_pm_reset(struct pci_dev
*dev
, int probe
)
3849 if (!dev
->pm_cap
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_PM_RESET
)
3852 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &csr
);
3853 if (csr
& PCI_PM_CTRL_NO_SOFT_RESET
)
3859 if (dev
->current_state
!= PCI_D0
)
3862 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3864 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3865 pci_dev_d3_sleep(dev
);
3867 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3869 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3870 pci_dev_d3_sleep(dev
);
3875 void pci_reset_secondary_bus(struct pci_dev
*dev
)
3879 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &ctrl
);
3880 ctrl
|= PCI_BRIDGE_CTL_BUS_RESET
;
3881 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3883 * PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double
3884 * this to 2ms to ensure that we meet the minimum requirement.
3888 ctrl
&= ~PCI_BRIDGE_CTL_BUS_RESET
;
3889 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3892 * Trhfa for conventional PCI is 2^25 clock cycles.
3893 * Assuming a minimum 33MHz clock this results in a 1s
3894 * delay before we can consider subordinate devices to
3895 * be re-initialized. PCIe has some ways to shorten this,
3896 * but we don't make use of them yet.
3901 void __weak
pcibios_reset_secondary_bus(struct pci_dev
*dev
)
3903 pci_reset_secondary_bus(dev
);
3907 * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge.
3908 * @dev: Bridge device
3910 * Use the bridge control register to assert reset on the secondary bus.
3911 * Devices on the secondary bus are left in power-on state.
3913 void pci_reset_bridge_secondary_bus(struct pci_dev
*dev
)
3915 pcibios_reset_secondary_bus(dev
);
3917 EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus
);
3919 static int pci_parent_bus_reset(struct pci_dev
*dev
, int probe
)
3921 struct pci_dev
*pdev
;
3923 if (pci_is_root_bus(dev
->bus
) || dev
->subordinate
||
3924 !dev
->bus
->self
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
3927 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
3934 pci_reset_bridge_secondary_bus(dev
->bus
->self
);
3939 static int pci_reset_hotplug_slot(struct hotplug_slot
*hotplug
, int probe
)
3943 if (!hotplug
|| !try_module_get(hotplug
->ops
->owner
))
3946 if (hotplug
->ops
->reset_slot
)
3947 rc
= hotplug
->ops
->reset_slot(hotplug
, probe
);
3949 module_put(hotplug
->ops
->owner
);
3954 static int pci_dev_reset_slot_function(struct pci_dev
*dev
, int probe
)
3956 struct pci_dev
*pdev
;
3958 if (dev
->subordinate
|| !dev
->slot
||
3959 dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
3962 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
3963 if (pdev
!= dev
&& pdev
->slot
== dev
->slot
)
3966 return pci_reset_hotplug_slot(dev
->slot
->hotplug
, probe
);
3969 static int __pci_dev_reset(struct pci_dev
*dev
, int probe
)
3975 rc
= pci_dev_specific_reset(dev
, probe
);
3979 rc
= pcie_flr(dev
, probe
);
3983 rc
= pci_af_flr(dev
, probe
);
3987 rc
= pci_pm_reset(dev
, probe
);
3991 rc
= pci_dev_reset_slot_function(dev
, probe
);
3995 rc
= pci_parent_bus_reset(dev
, probe
);
4000 static void pci_dev_lock(struct pci_dev
*dev
)
4002 pci_cfg_access_lock(dev
);
4003 /* block PM suspend, driver probe, etc. */
4004 device_lock(&dev
->dev
);
4007 /* Return 1 on successful lock, 0 on contention */
4008 static int pci_dev_trylock(struct pci_dev
*dev
)
4010 if (pci_cfg_access_trylock(dev
)) {
4011 if (device_trylock(&dev
->dev
))
4013 pci_cfg_access_unlock(dev
);
4019 static void pci_dev_unlock(struct pci_dev
*dev
)
4021 device_unlock(&dev
->dev
);
4022 pci_cfg_access_unlock(dev
);
4026 * pci_reset_notify - notify device driver of reset
4027 * @dev: device to be notified of reset
4028 * @prepare: 'true' if device is about to be reset; 'false' if reset attempt
4031 * Must be called prior to device access being disabled and after device
4032 * access is restored.
4034 static void pci_reset_notify(struct pci_dev
*dev
, bool prepare
)
4036 const struct pci_error_handlers
*err_handler
=
4037 dev
->driver
? dev
->driver
->err_handler
: NULL
;
4038 if (err_handler
&& err_handler
->reset_notify
)
4039 err_handler
->reset_notify(dev
, prepare
);
4042 static void pci_dev_save_and_disable(struct pci_dev
*dev
)
4044 pci_reset_notify(dev
, true);
4047 * Wake-up device prior to save. PM registers default to D0 after
4048 * reset and a simple register restore doesn't reliably return
4049 * to a non-D0 state anyway.
4051 pci_set_power_state(dev
, PCI_D0
);
4053 pci_save_state(dev
);
4055 * Disable the device by clearing the Command register, except for
4056 * INTx-disable which is set. This not only disables MMIO and I/O port
4057 * BARs, but also prevents the device from being Bus Master, preventing
4058 * DMA from the device including MSI/MSI-X interrupts. For PCI 2.3
4059 * compliant devices, INTx-disable prevents legacy interrupts.
4061 pci_write_config_word(dev
, PCI_COMMAND
, PCI_COMMAND_INTX_DISABLE
);
4064 static void pci_dev_restore(struct pci_dev
*dev
)
4066 pci_restore_state(dev
);
4067 pci_reset_notify(dev
, false);
4070 static int pci_dev_reset(struct pci_dev
*dev
, int probe
)
4077 rc
= __pci_dev_reset(dev
, probe
);
4080 pci_dev_unlock(dev
);
4086 * __pci_reset_function - reset a PCI device function
4087 * @dev: PCI device to reset
4089 * Some devices allow an individual function to be reset without affecting
4090 * other functions in the same device. The PCI device must be responsive
4091 * to PCI config space in order to use this function.
4093 * The device function is presumed to be unused when this function is called.
4094 * Resetting the device will make the contents of PCI configuration space
4095 * random, so any caller of this must be prepared to reinitialise the
4096 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
4099 * Returns 0 if the device function was successfully reset or negative if the
4100 * device doesn't support resetting a single function.
4102 int __pci_reset_function(struct pci_dev
*dev
)
4104 return pci_dev_reset(dev
, 0);
4106 EXPORT_SYMBOL_GPL(__pci_reset_function
);
4109 * __pci_reset_function_locked - reset a PCI device function while holding
4110 * the @dev mutex lock.
4111 * @dev: PCI device to reset
4113 * Some devices allow an individual function to be reset without affecting
4114 * other functions in the same device. The PCI device must be responsive
4115 * to PCI config space in order to use this function.
4117 * The device function is presumed to be unused and the caller is holding
4118 * the device mutex lock when this function is called.
4119 * Resetting the device will make the contents of PCI configuration space
4120 * random, so any caller of this must be prepared to reinitialise the
4121 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
4124 * Returns 0 if the device function was successfully reset or negative if the
4125 * device doesn't support resetting a single function.
4127 int __pci_reset_function_locked(struct pci_dev
*dev
)
4129 return __pci_dev_reset(dev
, 0);
4131 EXPORT_SYMBOL_GPL(__pci_reset_function_locked
);
4134 * pci_probe_reset_function - check whether the device can be safely reset
4135 * @dev: PCI device to reset
4137 * Some devices allow an individual function to be reset without affecting
4138 * other functions in the same device. The PCI device must be responsive
4139 * to PCI config space in order to use this function.
4141 * Returns 0 if the device function can be reset or negative if the
4142 * device doesn't support resetting a single function.
4144 int pci_probe_reset_function(struct pci_dev
*dev
)
4146 return pci_dev_reset(dev
, 1);
4150 * pci_reset_function - quiesce and reset a PCI device function
4151 * @dev: PCI device to reset
4153 * Some devices allow an individual function to be reset without affecting
4154 * other functions in the same device. The PCI device must be responsive
4155 * to PCI config space in order to use this function.
4157 * This function does not just reset the PCI portion of a device, but
4158 * clears all the state associated with the device. This function differs
4159 * from __pci_reset_function in that it saves and restores device state
4162 * Returns 0 if the device function was successfully reset or negative if the
4163 * device doesn't support resetting a single function.
4165 int pci_reset_function(struct pci_dev
*dev
)
4169 rc
= pci_dev_reset(dev
, 1);
4173 pci_dev_save_and_disable(dev
);
4175 rc
= pci_dev_reset(dev
, 0);
4177 pci_dev_restore(dev
);
4181 EXPORT_SYMBOL_GPL(pci_reset_function
);
4184 * pci_try_reset_function - quiesce and reset a PCI device function
4185 * @dev: PCI device to reset
4187 * Same as above, except return -EAGAIN if unable to lock device.
4189 int pci_try_reset_function(struct pci_dev
*dev
)
4193 rc
= pci_dev_reset(dev
, 1);
4197 pci_dev_save_and_disable(dev
);
4199 if (pci_dev_trylock(dev
)) {
4200 rc
= __pci_dev_reset(dev
, 0);
4201 pci_dev_unlock(dev
);
4205 pci_dev_restore(dev
);
4209 EXPORT_SYMBOL_GPL(pci_try_reset_function
);
4211 /* Do any devices on or below this bus prevent a bus reset? */
4212 static bool pci_bus_resetable(struct pci_bus
*bus
)
4214 struct pci_dev
*dev
;
4216 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4217 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4218 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4225 /* Lock devices from the top of the tree down */
4226 static void pci_bus_lock(struct pci_bus
*bus
)
4228 struct pci_dev
*dev
;
4230 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4232 if (dev
->subordinate
)
4233 pci_bus_lock(dev
->subordinate
);
4237 /* Unlock devices from the bottom of the tree up */
4238 static void pci_bus_unlock(struct pci_bus
*bus
)
4240 struct pci_dev
*dev
;
4242 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4243 if (dev
->subordinate
)
4244 pci_bus_unlock(dev
->subordinate
);
4245 pci_dev_unlock(dev
);
4249 /* Return 1 on successful lock, 0 on contention */
4250 static int pci_bus_trylock(struct pci_bus
*bus
)
4252 struct pci_dev
*dev
;
4254 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4255 if (!pci_dev_trylock(dev
))
4257 if (dev
->subordinate
) {
4258 if (!pci_bus_trylock(dev
->subordinate
)) {
4259 pci_dev_unlock(dev
);
4267 list_for_each_entry_continue_reverse(dev
, &bus
->devices
, bus_list
) {
4268 if (dev
->subordinate
)
4269 pci_bus_unlock(dev
->subordinate
);
4270 pci_dev_unlock(dev
);
4275 /* Do any devices on or below this slot prevent a bus reset? */
4276 static bool pci_slot_resetable(struct pci_slot
*slot
)
4278 struct pci_dev
*dev
;
4280 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4281 if (!dev
->slot
|| dev
->slot
!= slot
)
4283 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4284 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4291 /* Lock devices from the top of the tree down */
4292 static void pci_slot_lock(struct pci_slot
*slot
)
4294 struct pci_dev
*dev
;
4296 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4297 if (!dev
->slot
|| dev
->slot
!= slot
)
4300 if (dev
->subordinate
)
4301 pci_bus_lock(dev
->subordinate
);
4305 /* Unlock devices from the bottom of the tree up */
4306 static void pci_slot_unlock(struct pci_slot
*slot
)
4308 struct pci_dev
*dev
;
4310 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4311 if (!dev
->slot
|| dev
->slot
!= slot
)
4313 if (dev
->subordinate
)
4314 pci_bus_unlock(dev
->subordinate
);
4315 pci_dev_unlock(dev
);
4319 /* Return 1 on successful lock, 0 on contention */
4320 static int pci_slot_trylock(struct pci_slot
*slot
)
4322 struct pci_dev
*dev
;
4324 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4325 if (!dev
->slot
|| dev
->slot
!= slot
)
4327 if (!pci_dev_trylock(dev
))
4329 if (dev
->subordinate
) {
4330 if (!pci_bus_trylock(dev
->subordinate
)) {
4331 pci_dev_unlock(dev
);
4339 list_for_each_entry_continue_reverse(dev
,
4340 &slot
->bus
->devices
, bus_list
) {
4341 if (!dev
->slot
|| dev
->slot
!= slot
)
4343 if (dev
->subordinate
)
4344 pci_bus_unlock(dev
->subordinate
);
4345 pci_dev_unlock(dev
);
4350 /* Save and disable devices from the top of the tree down */
4351 static void pci_bus_save_and_disable(struct pci_bus
*bus
)
4353 struct pci_dev
*dev
;
4355 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4356 pci_dev_save_and_disable(dev
);
4357 if (dev
->subordinate
)
4358 pci_bus_save_and_disable(dev
->subordinate
);
4363 * Restore devices from top of the tree down - parent bridges need to be
4364 * restored before we can get to subordinate devices.
4366 static void pci_bus_restore(struct pci_bus
*bus
)
4368 struct pci_dev
*dev
;
4370 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4371 pci_dev_restore(dev
);
4372 if (dev
->subordinate
)
4373 pci_bus_restore(dev
->subordinate
);
4377 /* Save and disable devices from the top of the tree down */
4378 static void pci_slot_save_and_disable(struct pci_slot
*slot
)
4380 struct pci_dev
*dev
;
4382 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4383 if (!dev
->slot
|| dev
->slot
!= slot
)
4385 pci_dev_save_and_disable(dev
);
4386 if (dev
->subordinate
)
4387 pci_bus_save_and_disable(dev
->subordinate
);
4392 * Restore devices from top of the tree down - parent bridges need to be
4393 * restored before we can get to subordinate devices.
4395 static void pci_slot_restore(struct pci_slot
*slot
)
4397 struct pci_dev
*dev
;
4399 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4400 if (!dev
->slot
|| dev
->slot
!= slot
)
4402 pci_dev_restore(dev
);
4403 if (dev
->subordinate
)
4404 pci_bus_restore(dev
->subordinate
);
4408 static int pci_slot_reset(struct pci_slot
*slot
, int probe
)
4412 if (!slot
|| !pci_slot_resetable(slot
))
4416 pci_slot_lock(slot
);
4420 rc
= pci_reset_hotplug_slot(slot
->hotplug
, probe
);
4423 pci_slot_unlock(slot
);
4429 * pci_probe_reset_slot - probe whether a PCI slot can be reset
4430 * @slot: PCI slot to probe
4432 * Return 0 if slot can be reset, negative if a slot reset is not supported.
4434 int pci_probe_reset_slot(struct pci_slot
*slot
)
4436 return pci_slot_reset(slot
, 1);
4438 EXPORT_SYMBOL_GPL(pci_probe_reset_slot
);
4441 * pci_reset_slot - reset a PCI slot
4442 * @slot: PCI slot to reset
4444 * A PCI bus may host multiple slots, each slot may support a reset mechanism
4445 * independent of other slots. For instance, some slots may support slot power
4446 * control. In the case of a 1:1 bus to slot architecture, this function may
4447 * wrap the bus reset to avoid spurious slot related events such as hotplug.
4448 * Generally a slot reset should be attempted before a bus reset. All of the
4449 * function of the slot and any subordinate buses behind the slot are reset
4450 * through this function. PCI config space of all devices in the slot and
4451 * behind the slot is saved before and restored after reset.
4453 * Return 0 on success, non-zero on error.
4455 int pci_reset_slot(struct pci_slot
*slot
)
4459 rc
= pci_slot_reset(slot
, 1);
4463 pci_slot_save_and_disable(slot
);
4465 rc
= pci_slot_reset(slot
, 0);
4467 pci_slot_restore(slot
);
4471 EXPORT_SYMBOL_GPL(pci_reset_slot
);
4474 * pci_try_reset_slot - Try to reset a PCI slot
4475 * @slot: PCI slot to reset
4477 * Same as above except return -EAGAIN if the slot cannot be locked
4479 int pci_try_reset_slot(struct pci_slot
*slot
)
4483 rc
= pci_slot_reset(slot
, 1);
4487 pci_slot_save_and_disable(slot
);
4489 if (pci_slot_trylock(slot
)) {
4491 rc
= pci_reset_hotplug_slot(slot
->hotplug
, 0);
4492 pci_slot_unlock(slot
);
4496 pci_slot_restore(slot
);
4500 EXPORT_SYMBOL_GPL(pci_try_reset_slot
);
4502 static int pci_bus_reset(struct pci_bus
*bus
, int probe
)
4504 if (!bus
->self
|| !pci_bus_resetable(bus
))
4514 pci_reset_bridge_secondary_bus(bus
->self
);
4516 pci_bus_unlock(bus
);
4522 * pci_probe_reset_bus - probe whether a PCI bus can be reset
4523 * @bus: PCI bus to probe
4525 * Return 0 if bus can be reset, negative if a bus reset is not supported.
4527 int pci_probe_reset_bus(struct pci_bus
*bus
)
4529 return pci_bus_reset(bus
, 1);
4531 EXPORT_SYMBOL_GPL(pci_probe_reset_bus
);
4534 * pci_reset_bus - reset a PCI bus
4535 * @bus: top level PCI bus to reset
4537 * Do a bus reset on the given bus and any subordinate buses, saving
4538 * and restoring state of all devices.
4540 * Return 0 on success, non-zero on error.
4542 int pci_reset_bus(struct pci_bus
*bus
)
4546 rc
= pci_bus_reset(bus
, 1);
4550 pci_bus_save_and_disable(bus
);
4552 rc
= pci_bus_reset(bus
, 0);
4554 pci_bus_restore(bus
);
4558 EXPORT_SYMBOL_GPL(pci_reset_bus
);
4561 * pci_try_reset_bus - Try to reset a PCI bus
4562 * @bus: top level PCI bus to reset
4564 * Same as above except return -EAGAIN if the bus cannot be locked
4566 int pci_try_reset_bus(struct pci_bus
*bus
)
4570 rc
= pci_bus_reset(bus
, 1);
4574 pci_bus_save_and_disable(bus
);
4576 if (pci_bus_trylock(bus
)) {
4578 pci_reset_bridge_secondary_bus(bus
->self
);
4579 pci_bus_unlock(bus
);
4583 pci_bus_restore(bus
);
4587 EXPORT_SYMBOL_GPL(pci_try_reset_bus
);
4590 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
4591 * @dev: PCI device to query
4593 * Returns mmrbc: maximum designed memory read count in bytes
4594 * or appropriate error value.
4596 int pcix_get_max_mmrbc(struct pci_dev
*dev
)
4601 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4605 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4608 return 512 << ((stat
& PCI_X_STATUS_MAX_READ
) >> 21);
4610 EXPORT_SYMBOL(pcix_get_max_mmrbc
);
4613 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
4614 * @dev: PCI device to query
4616 * Returns mmrbc: maximum memory read count in bytes
4617 * or appropriate error value.
4619 int pcix_get_mmrbc(struct pci_dev
*dev
)
4624 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4628 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4631 return 512 << ((cmd
& PCI_X_CMD_MAX_READ
) >> 2);
4633 EXPORT_SYMBOL(pcix_get_mmrbc
);
4636 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
4637 * @dev: PCI device to query
4638 * @mmrbc: maximum memory read count in bytes
4639 * valid values are 512, 1024, 2048, 4096
4641 * If possible sets maximum memory read byte count, some bridges have erratas
4642 * that prevent this.
4644 int pcix_set_mmrbc(struct pci_dev
*dev
, int mmrbc
)
4650 if (mmrbc
< 512 || mmrbc
> 4096 || !is_power_of_2(mmrbc
))
4653 v
= ffs(mmrbc
) - 10;
4655 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4659 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4662 if (v
> (stat
& PCI_X_STATUS_MAX_READ
) >> 21)
4665 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4668 o
= (cmd
& PCI_X_CMD_MAX_READ
) >> 2;
4670 if (v
> o
&& (dev
->bus
->bus_flags
& PCI_BUS_FLAGS_NO_MMRBC
))
4673 cmd
&= ~PCI_X_CMD_MAX_READ
;
4675 if (pci_write_config_word(dev
, cap
+ PCI_X_CMD
, cmd
))
4680 EXPORT_SYMBOL(pcix_set_mmrbc
);
4683 * pcie_get_readrq - get PCI Express read request size
4684 * @dev: PCI device to query
4686 * Returns maximum memory read request in bytes
4687 * or appropriate error value.
4689 int pcie_get_readrq(struct pci_dev
*dev
)
4693 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4695 return 128 << ((ctl
& PCI_EXP_DEVCTL_READRQ
) >> 12);
4697 EXPORT_SYMBOL(pcie_get_readrq
);
4700 * pcie_set_readrq - set PCI Express maximum memory read request
4701 * @dev: PCI device to query
4702 * @rq: maximum memory read count in bytes
4703 * valid values are 128, 256, 512, 1024, 2048, 4096
4705 * If possible sets maximum memory read request in bytes
4707 int pcie_set_readrq(struct pci_dev
*dev
, int rq
)
4711 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
4715 * If using the "performance" PCIe config, we clamp the
4716 * read rq size to the max packet size to prevent the
4717 * host bridge generating requests larger than we can
4720 if (pcie_bus_config
== PCIE_BUS_PERFORMANCE
) {
4721 int mps
= pcie_get_mps(dev
);
4727 v
= (ffs(rq
) - 8) << 12;
4729 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4730 PCI_EXP_DEVCTL_READRQ
, v
);
4732 EXPORT_SYMBOL(pcie_set_readrq
);
4735 * pcie_get_mps - get PCI Express maximum payload size
4736 * @dev: PCI device to query
4738 * Returns maximum payload size in bytes
4740 int pcie_get_mps(struct pci_dev
*dev
)
4744 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4746 return 128 << ((ctl
& PCI_EXP_DEVCTL_PAYLOAD
) >> 5);
4748 EXPORT_SYMBOL(pcie_get_mps
);
4751 * pcie_set_mps - set PCI Express maximum payload size
4752 * @dev: PCI device to query
4753 * @mps: maximum payload size in bytes
4754 * valid values are 128, 256, 512, 1024, 2048, 4096
4756 * If possible sets maximum payload size
4758 int pcie_set_mps(struct pci_dev
*dev
, int mps
)
4762 if (mps
< 128 || mps
> 4096 || !is_power_of_2(mps
))
4766 if (v
> dev
->pcie_mpss
)
4770 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4771 PCI_EXP_DEVCTL_PAYLOAD
, v
);
4773 EXPORT_SYMBOL(pcie_set_mps
);
4776 * pcie_get_minimum_link - determine minimum link settings of a PCI device
4777 * @dev: PCI device to query
4778 * @speed: storage for minimum speed
4779 * @width: storage for minimum width
4781 * This function will walk up the PCI device chain and determine the minimum
4782 * link width and speed of the device.
4784 int pcie_get_minimum_link(struct pci_dev
*dev
, enum pci_bus_speed
*speed
,
4785 enum pcie_link_width
*width
)
4789 *speed
= PCI_SPEED_UNKNOWN
;
4790 *width
= PCIE_LNK_WIDTH_UNKNOWN
;
4794 enum pci_bus_speed next_speed
;
4795 enum pcie_link_width next_width
;
4797 ret
= pcie_capability_read_word(dev
, PCI_EXP_LNKSTA
, &lnksta
);
4801 next_speed
= pcie_link_speed
[lnksta
& PCI_EXP_LNKSTA_CLS
];
4802 next_width
= (lnksta
& PCI_EXP_LNKSTA_NLW
) >>
4803 PCI_EXP_LNKSTA_NLW_SHIFT
;
4805 if (next_speed
< *speed
)
4806 *speed
= next_speed
;
4808 if (next_width
< *width
)
4809 *width
= next_width
;
4811 dev
= dev
->bus
->self
;
4816 EXPORT_SYMBOL(pcie_get_minimum_link
);
4819 * pci_select_bars - Make BAR mask from the type of resource
4820 * @dev: the PCI device for which BAR mask is made
4821 * @flags: resource type mask to be selected
4823 * This helper routine makes bar mask from the type of resource.
4825 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
4828 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
4829 if (pci_resource_flags(dev
, i
) & flags
)
4833 EXPORT_SYMBOL(pci_select_bars
);
4836 * pci_resource_bar - get position of the BAR associated with a resource
4837 * @dev: the PCI device
4838 * @resno: the resource number
4839 * @type: the BAR type to be filled in
4841 * Returns BAR position in config space, or 0 if the BAR is invalid.
4843 int pci_resource_bar(struct pci_dev
*dev
, int resno
, enum pci_bar_type
*type
)
4847 if (resno
< PCI_ROM_RESOURCE
) {
4848 *type
= pci_bar_unknown
;
4849 return PCI_BASE_ADDRESS_0
+ 4 * resno
;
4850 } else if (resno
== PCI_ROM_RESOURCE
) {
4851 *type
= pci_bar_mem32
;
4852 return dev
->rom_base_reg
;
4853 } else if (resno
< PCI_BRIDGE_RESOURCES
) {
4854 /* device specific resource */
4855 *type
= pci_bar_unknown
;
4856 reg
= pci_iov_resource_bar(dev
, resno
);
4861 dev_err(&dev
->dev
, "BAR %d: invalid resource\n", resno
);
4865 /* Some architectures require additional programming to enable VGA */
4866 static arch_set_vga_state_t arch_set_vga_state
;
4868 void __init
pci_register_set_vga_state(arch_set_vga_state_t func
)
4870 arch_set_vga_state
= func
; /* NULL disables */
4873 static int pci_set_vga_state_arch(struct pci_dev
*dev
, bool decode
,
4874 unsigned int command_bits
, u32 flags
)
4876 if (arch_set_vga_state
)
4877 return arch_set_vga_state(dev
, decode
, command_bits
,
4883 * pci_set_vga_state - set VGA decode state on device and parents if requested
4884 * @dev: the PCI device
4885 * @decode: true = enable decoding, false = disable decoding
4886 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
4887 * @flags: traverse ancestors and change bridges
4888 * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
4890 int pci_set_vga_state(struct pci_dev
*dev
, bool decode
,
4891 unsigned int command_bits
, u32 flags
)
4893 struct pci_bus
*bus
;
4894 struct pci_dev
*bridge
;
4898 WARN_ON((flags
& PCI_VGA_STATE_CHANGE_DECODES
) && (command_bits
& ~(PCI_COMMAND_IO
|PCI_COMMAND_MEMORY
)));
4900 /* ARCH specific VGA enables */
4901 rc
= pci_set_vga_state_arch(dev
, decode
, command_bits
, flags
);
4905 if (flags
& PCI_VGA_STATE_CHANGE_DECODES
) {
4906 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
4908 cmd
|= command_bits
;
4910 cmd
&= ~command_bits
;
4911 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
4914 if (!(flags
& PCI_VGA_STATE_CHANGE_BRIDGE
))
4921 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
4924 cmd
|= PCI_BRIDGE_CTL_VGA
;
4926 cmd
&= ~PCI_BRIDGE_CTL_VGA
;
4927 pci_write_config_word(bridge
, PCI_BRIDGE_CONTROL
,
4936 * pci_add_dma_alias - Add a DMA devfn alias for a device
4937 * @dev: the PCI device for which alias is added
4938 * @devfn: alias slot and function
4940 * This helper encodes 8-bit devfn as bit number in dma_alias_mask.
4941 * It should be called early, preferably as PCI fixup header quirk.
4943 void pci_add_dma_alias(struct pci_dev
*dev
, u8 devfn
)
4945 if (!dev
->dma_alias_mask
)
4946 dev
->dma_alias_mask
= kcalloc(BITS_TO_LONGS(U8_MAX
),
4947 sizeof(long), GFP_KERNEL
);
4948 if (!dev
->dma_alias_mask
) {
4949 dev_warn(&dev
->dev
, "Unable to allocate DMA alias mask\n");
4953 set_bit(devfn
, dev
->dma_alias_mask
);
4954 dev_info(&dev
->dev
, "Enabling fixed DMA alias to %02x.%d\n",
4955 PCI_SLOT(devfn
), PCI_FUNC(devfn
));
4958 bool pci_devs_are_dma_aliases(struct pci_dev
*dev1
, struct pci_dev
*dev2
)
4960 return (dev1
->dma_alias_mask
&&
4961 test_bit(dev2
->devfn
, dev1
->dma_alias_mask
)) ||
4962 (dev2
->dma_alias_mask
&&
4963 test_bit(dev1
->devfn
, dev2
->dma_alias_mask
));
4966 bool pci_device_is_present(struct pci_dev
*pdev
)
4970 return pci_bus_read_dev_vendor_id(pdev
->bus
, pdev
->devfn
, &v
, 0);
4972 EXPORT_SYMBOL_GPL(pci_device_is_present
);
4974 void pci_ignore_hotplug(struct pci_dev
*dev
)
4976 struct pci_dev
*bridge
= dev
->bus
->self
;
4978 dev
->ignore_hotplug
= 1;
4979 /* Propagate the "ignore hotplug" setting to the parent bridge. */
4981 bridge
->ignore_hotplug
= 1;
4983 EXPORT_SYMBOL_GPL(pci_ignore_hotplug
);
4985 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
4986 static char resource_alignment_param
[RESOURCE_ALIGNMENT_PARAM_SIZE
] = {0};
4987 static DEFINE_SPINLOCK(resource_alignment_lock
);
4990 * pci_specified_resource_alignment - get resource alignment specified by user.
4991 * @dev: the PCI device to get
4993 * RETURNS: Resource alignment if it is specified.
4994 * Zero if it is not specified.
4996 static resource_size_t
pci_specified_resource_alignment(struct pci_dev
*dev
)
4998 int seg
, bus
, slot
, func
, align_order
, count
;
4999 unsigned short vendor
, device
, subsystem_vendor
, subsystem_device
;
5000 resource_size_t align
= 0;
5003 spin_lock(&resource_alignment_lock
);
5004 p
= resource_alignment_param
;
5007 if (pci_has_flag(PCI_PROBE_ONLY
)) {
5008 pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n");
5014 if (sscanf(p
, "%d%n", &align_order
, &count
) == 1 &&
5020 if (strncmp(p
, "pci:", 4) == 0) {
5021 /* PCI vendor/device (subvendor/subdevice) ids are specified */
5023 if (sscanf(p
, "%hx:%hx:%hx:%hx%n",
5024 &vendor
, &device
, &subsystem_vendor
, &subsystem_device
, &count
) != 4) {
5025 if (sscanf(p
, "%hx:%hx%n", &vendor
, &device
, &count
) != 2) {
5026 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: pci:%s\n",
5030 subsystem_vendor
= subsystem_device
= 0;
5033 if ((!vendor
|| (vendor
== dev
->vendor
)) &&
5034 (!device
|| (device
== dev
->device
)) &&
5035 (!subsystem_vendor
|| (subsystem_vendor
== dev
->subsystem_vendor
)) &&
5036 (!subsystem_device
|| (subsystem_device
== dev
->subsystem_device
))) {
5037 if (align_order
== -1)
5040 align
= 1 << align_order
;
5046 if (sscanf(p
, "%x:%x:%x.%x%n",
5047 &seg
, &bus
, &slot
, &func
, &count
) != 4) {
5049 if (sscanf(p
, "%x:%x.%x%n",
5050 &bus
, &slot
, &func
, &count
) != 3) {
5051 /* Invalid format */
5052 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: %s\n",
5058 if (seg
== pci_domain_nr(dev
->bus
) &&
5059 bus
== dev
->bus
->number
&&
5060 slot
== PCI_SLOT(dev
->devfn
) &&
5061 func
== PCI_FUNC(dev
->devfn
)) {
5062 if (align_order
== -1)
5065 align
= 1 << align_order
;
5070 if (*p
!= ';' && *p
!= ',') {
5071 /* End of param or invalid format */
5077 spin_unlock(&resource_alignment_lock
);
5082 * This function disables memory decoding and releases memory resources
5083 * of the device specified by kernel's boot parameter 'pci=resource_alignment='.
5084 * It also rounds up size to specified alignment.
5085 * Later on, the kernel will assign page-aligned memory resource back
5088 void pci_reassigndev_resource_alignment(struct pci_dev
*dev
)
5092 resource_size_t align
, size
;
5096 * VF BARs are read-only zero according to SR-IOV spec r1.1, sec
5097 * 3.4.1.11. Their resources are allocated from the space
5098 * described by the VF BARx register in the PF's SR-IOV capability.
5099 * We can't influence their alignment here.
5104 /* check if specified PCI is target device to reassign */
5105 align
= pci_specified_resource_alignment(dev
);
5109 if (dev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
&&
5110 (dev
->class >> 8) == PCI_CLASS_BRIDGE_HOST
) {
5112 "Can't reassign resources to host bridge.\n");
5117 "Disabling memory decoding and releasing memory resources.\n");
5118 pci_read_config_word(dev
, PCI_COMMAND
, &command
);
5119 command
&= ~PCI_COMMAND_MEMORY
;
5120 pci_write_config_word(dev
, PCI_COMMAND
, command
);
5122 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++) {
5123 r
= &dev
->resource
[i
];
5124 if (!(r
->flags
& IORESOURCE_MEM
))
5126 if (r
->flags
& IORESOURCE_PCI_FIXED
) {
5127 dev_info(&dev
->dev
, "Ignoring requested alignment for BAR%d: %pR\n",
5132 size
= resource_size(r
);
5136 "Rounding up size of resource #%d to %#llx.\n",
5137 i
, (unsigned long long)size
);
5139 r
->flags
|= IORESOURCE_UNSET
;
5143 /* Need to disable bridge's resource window,
5144 * to enable the kernel to reassign new resource
5147 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
&&
5148 (dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
5149 for (i
= PCI_BRIDGE_RESOURCES
; i
< PCI_NUM_RESOURCES
; i
++) {
5150 r
= &dev
->resource
[i
];
5151 if (!(r
->flags
& IORESOURCE_MEM
))
5153 r
->flags
|= IORESOURCE_UNSET
;
5154 r
->end
= resource_size(r
) - 1;
5157 pci_disable_bridge_window(dev
);
5161 static ssize_t
pci_set_resource_alignment_param(const char *buf
, size_t count
)
5163 if (count
> RESOURCE_ALIGNMENT_PARAM_SIZE
- 1)
5164 count
= RESOURCE_ALIGNMENT_PARAM_SIZE
- 1;
5165 spin_lock(&resource_alignment_lock
);
5166 strncpy(resource_alignment_param
, buf
, count
);
5167 resource_alignment_param
[count
] = '\0';
5168 spin_unlock(&resource_alignment_lock
);
5172 static ssize_t
pci_get_resource_alignment_param(char *buf
, size_t size
)
5175 spin_lock(&resource_alignment_lock
);
5176 count
= snprintf(buf
, size
, "%s", resource_alignment_param
);
5177 spin_unlock(&resource_alignment_lock
);
5181 static ssize_t
pci_resource_alignment_show(struct bus_type
*bus
, char *buf
)
5183 return pci_get_resource_alignment_param(buf
, PAGE_SIZE
);
5186 static ssize_t
pci_resource_alignment_store(struct bus_type
*bus
,
5187 const char *buf
, size_t count
)
5189 return pci_set_resource_alignment_param(buf
, count
);
5192 static BUS_ATTR(resource_alignment
, 0644, pci_resource_alignment_show
,
5193 pci_resource_alignment_store
);
5195 static int __init
pci_resource_alignment_sysfs_init(void)
5197 return bus_create_file(&pci_bus_type
,
5198 &bus_attr_resource_alignment
);
5200 late_initcall(pci_resource_alignment_sysfs_init
);
5202 static void pci_no_domains(void)
5204 #ifdef CONFIG_PCI_DOMAINS
5205 pci_domains_supported
= 0;
5209 #ifdef CONFIG_PCI_DOMAINS
5210 static atomic_t __domain_nr
= ATOMIC_INIT(-1);
5212 int pci_get_new_domain_nr(void)
5214 return atomic_inc_return(&__domain_nr
);
5217 #ifdef CONFIG_PCI_DOMAINS_GENERIC
5218 static int of_pci_bus_find_domain_nr(struct device
*parent
)
5220 static int use_dt_domains
= -1;
5224 domain
= of_get_pci_domain_nr(parent
->of_node
);
5226 * Check DT domain and use_dt_domains values.
5228 * If DT domain property is valid (domain >= 0) and
5229 * use_dt_domains != 0, the DT assignment is valid since this means
5230 * we have not previously allocated a domain number by using
5231 * pci_get_new_domain_nr(); we should also update use_dt_domains to
5232 * 1, to indicate that we have just assigned a domain number from
5235 * If DT domain property value is not valid (ie domain < 0), and we
5236 * have not previously assigned a domain number from DT
5237 * (use_dt_domains != 1) we should assign a domain number by
5240 * pci_get_new_domain_nr()
5242 * API and update the use_dt_domains value to keep track of method we
5243 * are using to assign domain numbers (use_dt_domains = 0).
5245 * All other combinations imply we have a platform that is trying
5246 * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
5247 * which is a recipe for domain mishandling and it is prevented by
5248 * invalidating the domain value (domain = -1) and printing a
5249 * corresponding error.
5251 if (domain
>= 0 && use_dt_domains
) {
5253 } else if (domain
< 0 && use_dt_domains
!= 1) {
5255 domain
= pci_get_new_domain_nr();
5257 dev_err(parent
, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
5258 parent
->of_node
->full_name
);
5265 int pci_bus_find_domain_nr(struct pci_bus
*bus
, struct device
*parent
)
5267 return acpi_disabled
? of_pci_bus_find_domain_nr(parent
) :
5268 acpi_pci_bus_find_domain_nr(bus
);
5274 * pci_ext_cfg_avail - can we access extended PCI config space?
5276 * Returns 1 if we can access PCI extended config space (offsets
5277 * greater than 0xff). This is the default implementation. Architecture
5278 * implementations can override this.
5280 int __weak
pci_ext_cfg_avail(void)
5285 void __weak
pci_fixup_cardbus(struct pci_bus
*bus
)
5288 EXPORT_SYMBOL(pci_fixup_cardbus
);
5290 static int __init
pci_setup(char *str
)
5293 char *k
= strchr(str
, ',');
5296 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
5297 if (!strcmp(str
, "nomsi")) {
5299 } else if (!strcmp(str
, "noaer")) {
5301 } else if (!strncmp(str
, "realloc=", 8)) {
5302 pci_realloc_get_opt(str
+ 8);
5303 } else if (!strncmp(str
, "realloc", 7)) {
5304 pci_realloc_get_opt("on");
5305 } else if (!strcmp(str
, "nodomains")) {
5307 } else if (!strncmp(str
, "noari", 5)) {
5308 pcie_ari_disabled
= true;
5309 } else if (!strncmp(str
, "cbiosize=", 9)) {
5310 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
5311 } else if (!strncmp(str
, "cbmemsize=", 10)) {
5312 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
5313 } else if (!strncmp(str
, "resource_alignment=", 19)) {
5314 pci_set_resource_alignment_param(str
+ 19,
5316 } else if (!strncmp(str
, "ecrc=", 5)) {
5317 pcie_ecrc_get_policy(str
+ 5);
5318 } else if (!strncmp(str
, "hpiosize=", 9)) {
5319 pci_hotplug_io_size
= memparse(str
+ 9, &str
);
5320 } else if (!strncmp(str
, "hpmemsize=", 10)) {
5321 pci_hotplug_mem_size
= memparse(str
+ 10, &str
);
5322 } else if (!strncmp(str
, "hpbussize=", 10)) {
5323 pci_hotplug_bus_size
=
5324 simple_strtoul(str
+ 10, &str
, 0);
5325 if (pci_hotplug_bus_size
> 0xff)
5326 pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
5327 } else if (!strncmp(str
, "pcie_bus_tune_off", 17)) {
5328 pcie_bus_config
= PCIE_BUS_TUNE_OFF
;
5329 } else if (!strncmp(str
, "pcie_bus_safe", 13)) {
5330 pcie_bus_config
= PCIE_BUS_SAFE
;
5331 } else if (!strncmp(str
, "pcie_bus_perf", 13)) {
5332 pcie_bus_config
= PCIE_BUS_PERFORMANCE
;
5333 } else if (!strncmp(str
, "pcie_bus_peer2peer", 18)) {
5334 pcie_bus_config
= PCIE_BUS_PEER2PEER
;
5335 } else if (!strncmp(str
, "pcie_scan_all", 13)) {
5336 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS
);
5338 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
5346 early_param("pci", pci_setup
);