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 <linux/pci-ats.h>
32 #include <asm/setup.h>
34 #include <linux/aer.h>
37 const char *pci_power_names
[] = {
38 "error", "D0", "D1", "D2", "D3hot", "D3cold", "unknown",
40 EXPORT_SYMBOL_GPL(pci_power_names
);
42 int isa_dma_bridge_buggy
;
43 EXPORT_SYMBOL(isa_dma_bridge_buggy
);
46 EXPORT_SYMBOL(pci_pci_problems
);
48 unsigned int pci_pm_d3_delay
;
50 static void pci_pme_list_scan(struct work_struct
*work
);
52 static LIST_HEAD(pci_pme_list
);
53 static DEFINE_MUTEX(pci_pme_list_mutex
);
54 static DECLARE_DELAYED_WORK(pci_pme_work
, pci_pme_list_scan
);
56 struct pci_pme_device
{
57 struct list_head list
;
61 #define PME_TIMEOUT 1000 /* How long between PME checks */
63 static void pci_dev_d3_sleep(struct pci_dev
*dev
)
65 unsigned int delay
= dev
->d3_delay
;
67 if (delay
< pci_pm_d3_delay
)
68 delay
= pci_pm_d3_delay
;
74 #ifdef CONFIG_PCI_DOMAINS
75 int pci_domains_supported
= 1;
78 #define DEFAULT_CARDBUS_IO_SIZE (256)
79 #define DEFAULT_CARDBUS_MEM_SIZE (64*1024*1024)
80 /* pci=cbmemsize=nnM,cbiosize=nn can override this */
81 unsigned long pci_cardbus_io_size
= DEFAULT_CARDBUS_IO_SIZE
;
82 unsigned long pci_cardbus_mem_size
= DEFAULT_CARDBUS_MEM_SIZE
;
84 #define DEFAULT_HOTPLUG_IO_SIZE (256)
85 #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
86 /* pci=hpmemsize=nnM,hpiosize=nn can override this */
87 unsigned long pci_hotplug_io_size
= DEFAULT_HOTPLUG_IO_SIZE
;
88 unsigned long pci_hotplug_mem_size
= DEFAULT_HOTPLUG_MEM_SIZE
;
90 #define DEFAULT_HOTPLUG_BUS_SIZE 1
91 unsigned long pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
93 enum pcie_bus_config_types pcie_bus_config
= PCIE_BUS_DEFAULT
;
96 * The default CLS is used if arch didn't set CLS explicitly and not
97 * all pci devices agree on the same value. Arch can override either
98 * the dfl or actual value as it sees fit. Don't forget this is
99 * measured in 32-bit words, not bytes.
101 u8 pci_dfl_cache_line_size
= L1_CACHE_BYTES
>> 2;
102 u8 pci_cache_line_size
;
105 * If we set up a device for bus mastering, we need to check the latency
106 * timer as certain BIOSes forget to set it properly.
108 unsigned int pcibios_max_latency
= 255;
110 /* If set, the PCIe ARI capability will not be used. */
111 static bool pcie_ari_disabled
;
113 /* Disable bridge_d3 for all PCIe ports */
114 static bool pci_bridge_d3_disable
;
115 /* Force bridge_d3 for all PCIe ports */
116 static bool pci_bridge_d3_force
;
118 static int __init
pcie_port_pm_setup(char *str
)
120 if (!strcmp(str
, "off"))
121 pci_bridge_d3_disable
= true;
122 else if (!strcmp(str
, "force"))
123 pci_bridge_d3_force
= true;
126 __setup("pcie_port_pm=", pcie_port_pm_setup
);
129 * pci_bus_max_busnr - returns maximum PCI bus number of given bus' children
130 * @bus: pointer to PCI bus structure to search
132 * Given a PCI bus, returns the highest PCI bus number present in the set
133 * including the given PCI bus and its list of child PCI buses.
135 unsigned char pci_bus_max_busnr(struct pci_bus
*bus
)
138 unsigned char max
, n
;
140 max
= bus
->busn_res
.end
;
141 list_for_each_entry(tmp
, &bus
->children
, node
) {
142 n
= pci_bus_max_busnr(tmp
);
148 EXPORT_SYMBOL_GPL(pci_bus_max_busnr
);
150 #ifdef CONFIG_HAS_IOMEM
151 void __iomem
*pci_ioremap_bar(struct pci_dev
*pdev
, int bar
)
153 struct resource
*res
= &pdev
->resource
[bar
];
156 * Make sure the BAR is actually a memory resource, not an IO resource
158 if (res
->flags
& IORESOURCE_UNSET
|| !(res
->flags
& IORESOURCE_MEM
)) {
159 dev_warn(&pdev
->dev
, "can't ioremap BAR %d: %pR\n", bar
, res
);
162 return ioremap_nocache(res
->start
, resource_size(res
));
164 EXPORT_SYMBOL_GPL(pci_ioremap_bar
);
166 void __iomem
*pci_ioremap_wc_bar(struct pci_dev
*pdev
, int bar
)
169 * Make sure the BAR is actually a memory resource, not an IO resource
171 if (!(pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)) {
175 return ioremap_wc(pci_resource_start(pdev
, bar
),
176 pci_resource_len(pdev
, bar
));
178 EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar
);
182 static int __pci_find_next_cap_ttl(struct pci_bus
*bus
, unsigned int devfn
,
183 u8 pos
, int cap
, int *ttl
)
188 pci_bus_read_config_byte(bus
, devfn
, pos
, &pos
);
194 pci_bus_read_config_word(bus
, devfn
, pos
, &ent
);
206 static int __pci_find_next_cap(struct pci_bus
*bus
, unsigned int devfn
,
209 int ttl
= PCI_FIND_CAP_TTL
;
211 return __pci_find_next_cap_ttl(bus
, devfn
, pos
, cap
, &ttl
);
214 int pci_find_next_capability(struct pci_dev
*dev
, u8 pos
, int cap
)
216 return __pci_find_next_cap(dev
->bus
, dev
->devfn
,
217 pos
+ PCI_CAP_LIST_NEXT
, cap
);
219 EXPORT_SYMBOL_GPL(pci_find_next_capability
);
221 static int __pci_bus_find_cap_start(struct pci_bus
*bus
,
222 unsigned int devfn
, u8 hdr_type
)
226 pci_bus_read_config_word(bus
, devfn
, PCI_STATUS
, &status
);
227 if (!(status
& PCI_STATUS_CAP_LIST
))
231 case PCI_HEADER_TYPE_NORMAL
:
232 case PCI_HEADER_TYPE_BRIDGE
:
233 return PCI_CAPABILITY_LIST
;
234 case PCI_HEADER_TYPE_CARDBUS
:
235 return PCI_CB_CAPABILITY_LIST
;
242 * pci_find_capability - query for devices' capabilities
243 * @dev: PCI device to query
244 * @cap: capability code
246 * Tell if a device supports a given PCI capability.
247 * Returns the address of the requested capability structure within the
248 * device's PCI configuration space or 0 in case the device does not
249 * support it. Possible values for @cap:
251 * %PCI_CAP_ID_PM Power Management
252 * %PCI_CAP_ID_AGP Accelerated Graphics Port
253 * %PCI_CAP_ID_VPD Vital Product Data
254 * %PCI_CAP_ID_SLOTID Slot Identification
255 * %PCI_CAP_ID_MSI Message Signalled Interrupts
256 * %PCI_CAP_ID_CHSWP CompactPCI HotSwap
257 * %PCI_CAP_ID_PCIX PCI-X
258 * %PCI_CAP_ID_EXP PCI Express
260 int pci_find_capability(struct pci_dev
*dev
, int cap
)
264 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
266 pos
= __pci_find_next_cap(dev
->bus
, dev
->devfn
, pos
, cap
);
270 EXPORT_SYMBOL(pci_find_capability
);
273 * pci_bus_find_capability - query for devices' capabilities
274 * @bus: the PCI bus to query
275 * @devfn: PCI device to query
276 * @cap: capability code
278 * Like pci_find_capability() but works for pci devices that do not have a
279 * pci_dev structure set up yet.
281 * Returns the address of the requested capability structure within the
282 * device's PCI configuration space or 0 in case the device does not
285 int pci_bus_find_capability(struct pci_bus
*bus
, unsigned int devfn
, int cap
)
290 pci_bus_read_config_byte(bus
, devfn
, PCI_HEADER_TYPE
, &hdr_type
);
292 pos
= __pci_bus_find_cap_start(bus
, devfn
, hdr_type
& 0x7f);
294 pos
= __pci_find_next_cap(bus
, devfn
, pos
, cap
);
298 EXPORT_SYMBOL(pci_bus_find_capability
);
301 * pci_find_next_ext_capability - Find an extended capability
302 * @dev: PCI device to query
303 * @start: address at which to start looking (0 to start at beginning of list)
304 * @cap: capability code
306 * Returns the address of the next matching extended capability structure
307 * within the device's PCI configuration space or 0 if the device does
308 * not support it. Some capabilities can occur several times, e.g., the
309 * vendor-specific capability, and this provides a way to find them all.
311 int pci_find_next_ext_capability(struct pci_dev
*dev
, int start
, int cap
)
315 int pos
= PCI_CFG_SPACE_SIZE
;
317 /* minimum 8 bytes per capability */
318 ttl
= (PCI_CFG_SPACE_EXP_SIZE
- PCI_CFG_SPACE_SIZE
) / 8;
320 if (dev
->cfg_size
<= PCI_CFG_SPACE_SIZE
)
326 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
330 * If we have no capabilities, this is indicated by cap ID,
331 * cap version and next pointer all being 0.
337 if (PCI_EXT_CAP_ID(header
) == cap
&& pos
!= start
)
340 pos
= PCI_EXT_CAP_NEXT(header
);
341 if (pos
< PCI_CFG_SPACE_SIZE
)
344 if (pci_read_config_dword(dev
, pos
, &header
) != PCIBIOS_SUCCESSFUL
)
350 EXPORT_SYMBOL_GPL(pci_find_next_ext_capability
);
353 * pci_find_ext_capability - Find an extended capability
354 * @dev: PCI device to query
355 * @cap: capability code
357 * Returns the address of the requested extended capability structure
358 * within the device's PCI configuration space or 0 if the device does
359 * not support it. Possible values for @cap:
361 * %PCI_EXT_CAP_ID_ERR Advanced Error Reporting
362 * %PCI_EXT_CAP_ID_VC Virtual Channel
363 * %PCI_EXT_CAP_ID_DSN Device Serial Number
364 * %PCI_EXT_CAP_ID_PWR Power Budgeting
366 int pci_find_ext_capability(struct pci_dev
*dev
, int cap
)
368 return pci_find_next_ext_capability(dev
, 0, cap
);
370 EXPORT_SYMBOL_GPL(pci_find_ext_capability
);
372 static int __pci_find_next_ht_cap(struct pci_dev
*dev
, int pos
, int ht_cap
)
374 int rc
, ttl
= PCI_FIND_CAP_TTL
;
377 if (ht_cap
== HT_CAPTYPE_SLAVE
|| ht_cap
== HT_CAPTYPE_HOST
)
378 mask
= HT_3BIT_CAP_MASK
;
380 mask
= HT_5BIT_CAP_MASK
;
382 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
, pos
,
383 PCI_CAP_ID_HT
, &ttl
);
385 rc
= pci_read_config_byte(dev
, pos
+ 3, &cap
);
386 if (rc
!= PCIBIOS_SUCCESSFUL
)
389 if ((cap
& mask
) == ht_cap
)
392 pos
= __pci_find_next_cap_ttl(dev
->bus
, dev
->devfn
,
393 pos
+ PCI_CAP_LIST_NEXT
,
394 PCI_CAP_ID_HT
, &ttl
);
400 * pci_find_next_ht_capability - query a device's Hypertransport capabilities
401 * @dev: PCI device to query
402 * @pos: Position from which to continue searching
403 * @ht_cap: Hypertransport capability code
405 * To be used in conjunction with pci_find_ht_capability() to search for
406 * all capabilities matching @ht_cap. @pos should always be a value returned
407 * from pci_find_ht_capability().
409 * NB. To be 100% safe against broken PCI devices, the caller should take
410 * steps to avoid an infinite loop.
412 int pci_find_next_ht_capability(struct pci_dev
*dev
, int pos
, int ht_cap
)
414 return __pci_find_next_ht_cap(dev
, pos
+ PCI_CAP_LIST_NEXT
, ht_cap
);
416 EXPORT_SYMBOL_GPL(pci_find_next_ht_capability
);
419 * pci_find_ht_capability - query a device's Hypertransport capabilities
420 * @dev: PCI device to query
421 * @ht_cap: Hypertransport capability code
423 * Tell if a device supports a given Hypertransport capability.
424 * Returns an address within the device's PCI configuration space
425 * or 0 in case the device does not support the request capability.
426 * The address points to the PCI capability, of type PCI_CAP_ID_HT,
427 * which has a Hypertransport capability matching @ht_cap.
429 int pci_find_ht_capability(struct pci_dev
*dev
, int ht_cap
)
433 pos
= __pci_bus_find_cap_start(dev
->bus
, dev
->devfn
, dev
->hdr_type
);
435 pos
= __pci_find_next_ht_cap(dev
, pos
, ht_cap
);
439 EXPORT_SYMBOL_GPL(pci_find_ht_capability
);
442 * pci_find_parent_resource - return resource region of parent bus of given region
443 * @dev: PCI device structure contains resources to be searched
444 * @res: child resource record for which parent is sought
446 * For given resource region of given device, return the resource
447 * region of parent bus the given region is contained in.
449 struct resource
*pci_find_parent_resource(const struct pci_dev
*dev
,
450 struct resource
*res
)
452 const struct pci_bus
*bus
= dev
->bus
;
456 pci_bus_for_each_resource(bus
, r
, i
) {
459 if (resource_contains(r
, res
)) {
462 * If the window is prefetchable but the BAR is
463 * not, the allocator made a mistake.
465 if (r
->flags
& IORESOURCE_PREFETCH
&&
466 !(res
->flags
& IORESOURCE_PREFETCH
))
470 * If we're below a transparent bridge, there may
471 * be both a positively-decoded aperture and a
472 * subtractively-decoded region that contain the BAR.
473 * We want the positively-decoded one, so this depends
474 * on pci_bus_for_each_resource() giving us those
482 EXPORT_SYMBOL(pci_find_parent_resource
);
485 * pci_find_resource - Return matching PCI device resource
486 * @dev: PCI device to query
487 * @res: Resource to look for
489 * Goes over standard PCI resources (BARs) and checks if the given resource
490 * is partially or fully contained in any of them. In that case the
491 * matching resource is returned, %NULL otherwise.
493 struct resource
*pci_find_resource(struct pci_dev
*dev
, struct resource
*res
)
497 for (i
= 0; i
< PCI_ROM_RESOURCE
; i
++) {
498 struct resource
*r
= &dev
->resource
[i
];
500 if (r
->start
&& resource_contains(r
, res
))
506 EXPORT_SYMBOL(pci_find_resource
);
509 * pci_find_pcie_root_port - return PCIe Root Port
510 * @dev: PCI device to query
512 * Traverse up the parent chain and return the PCIe Root Port PCI Device
513 * for a given PCI Device.
515 struct pci_dev
*pci_find_pcie_root_port(struct pci_dev
*dev
)
517 struct pci_dev
*bridge
, *highest_pcie_bridge
= NULL
;
519 bridge
= pci_upstream_bridge(dev
);
520 while (bridge
&& pci_is_pcie(bridge
)) {
521 highest_pcie_bridge
= bridge
;
522 bridge
= pci_upstream_bridge(bridge
);
525 if (pci_pcie_type(highest_pcie_bridge
) != PCI_EXP_TYPE_ROOT_PORT
)
528 return highest_pcie_bridge
;
530 EXPORT_SYMBOL(pci_find_pcie_root_port
);
533 * pci_wait_for_pending - wait for @mask bit(s) to clear in status word @pos
534 * @dev: the PCI device to operate on
535 * @pos: config space offset of status word
536 * @mask: mask of bit(s) to care about in status word
538 * Return 1 when mask bit(s) in status word clear, 0 otherwise.
540 int pci_wait_for_pending(struct pci_dev
*dev
, int pos
, u16 mask
)
544 /* Wait for Transaction Pending bit clean */
545 for (i
= 0; i
< 4; i
++) {
548 msleep((1 << (i
- 1)) * 100);
550 pci_read_config_word(dev
, pos
, &status
);
551 if (!(status
& mask
))
559 * pci_restore_bars - restore a device's BAR values (e.g. after wake-up)
560 * @dev: PCI device to have its BARs restored
562 * Restore the BAR values for a given device, so as to make it
563 * accessible by its driver.
565 static void pci_restore_bars(struct pci_dev
*dev
)
569 for (i
= 0; i
< PCI_BRIDGE_RESOURCES
; i
++)
570 pci_update_resource(dev
, i
);
573 static const struct pci_platform_pm_ops
*pci_platform_pm
;
575 int pci_set_platform_pm(const struct pci_platform_pm_ops
*ops
)
577 if (!ops
->is_manageable
|| !ops
->set_state
|| !ops
->get_state
||
578 !ops
->choose_state
|| !ops
->set_wakeup
|| !ops
->need_resume
)
580 pci_platform_pm
= ops
;
584 static inline bool platform_pci_power_manageable(struct pci_dev
*dev
)
586 return pci_platform_pm
? pci_platform_pm
->is_manageable(dev
) : false;
589 static inline int platform_pci_set_power_state(struct pci_dev
*dev
,
592 return pci_platform_pm
? pci_platform_pm
->set_state(dev
, t
) : -ENOSYS
;
595 static inline pci_power_t
platform_pci_get_power_state(struct pci_dev
*dev
)
597 return pci_platform_pm
? pci_platform_pm
->get_state(dev
) : PCI_UNKNOWN
;
600 static inline pci_power_t
platform_pci_choose_state(struct pci_dev
*dev
)
602 return pci_platform_pm
?
603 pci_platform_pm
->choose_state(dev
) : PCI_POWER_ERROR
;
606 static inline int platform_pci_set_wakeup(struct pci_dev
*dev
, bool enable
)
608 return pci_platform_pm
?
609 pci_platform_pm
->set_wakeup(dev
, enable
) : -ENODEV
;
612 static inline bool platform_pci_need_resume(struct pci_dev
*dev
)
614 return pci_platform_pm
? pci_platform_pm
->need_resume(dev
) : false;
618 * pci_raw_set_power_state - Use PCI PM registers to set the power state of
620 * @dev: PCI device to handle.
621 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
624 * -EINVAL if the requested state is invalid.
625 * -EIO if device does not support PCI PM or its PM capabilities register has a
626 * wrong version, or device doesn't support the requested state.
627 * 0 if device already is in the requested state.
628 * 0 if device's power state has been successfully changed.
630 static int pci_raw_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
633 bool need_restore
= false;
635 /* Check if we're already there */
636 if (dev
->current_state
== state
)
642 if (state
< PCI_D0
|| state
> PCI_D3hot
)
645 /* Validate current state:
646 * Can enter D0 from any state, but if we can only go deeper
647 * to sleep if we're already in a low power state
649 if (state
!= PCI_D0
&& dev
->current_state
<= PCI_D3cold
650 && dev
->current_state
> state
) {
651 dev_err(&dev
->dev
, "invalid power transition (from state %d to %d)\n",
652 dev
->current_state
, state
);
656 /* check if this device supports the desired state */
657 if ((state
== PCI_D1
&& !dev
->d1_support
)
658 || (state
== PCI_D2
&& !dev
->d2_support
))
661 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
663 /* If we're (effectively) in D3, force entire word to 0.
664 * This doesn't affect PME_Status, disables PME_En, and
665 * sets PowerState to 0.
667 switch (dev
->current_state
) {
671 pmcsr
&= ~PCI_PM_CTRL_STATE_MASK
;
676 case PCI_UNKNOWN
: /* Boot-up */
677 if ((pmcsr
& PCI_PM_CTRL_STATE_MASK
) == PCI_D3hot
678 && !(pmcsr
& PCI_PM_CTRL_NO_SOFT_RESET
))
680 /* Fall-through: force to D0 */
686 /* enter specified state */
687 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
689 /* Mandatory power management transition delays */
690 /* see PCI PM 1.1 5.6.1 table 18 */
691 if (state
== PCI_D3hot
|| dev
->current_state
== PCI_D3hot
)
692 pci_dev_d3_sleep(dev
);
693 else if (state
== PCI_D2
|| dev
->current_state
== PCI_D2
)
694 udelay(PCI_PM_D2_DELAY
);
696 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
697 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
698 if (dev
->current_state
!= state
&& printk_ratelimit())
699 dev_info(&dev
->dev
, "Refused to change power state, currently in D%d\n",
703 * According to section 5.4.1 of the "PCI BUS POWER MANAGEMENT
704 * INTERFACE SPECIFICATION, REV. 1.2", a device transitioning
705 * from D3hot to D0 _may_ perform an internal reset, thereby
706 * going to "D0 Uninitialized" rather than "D0 Initialized".
707 * For example, at least some versions of the 3c905B and the
708 * 3c556B exhibit this behaviour.
710 * At least some laptop BIOSen (e.g. the Thinkpad T21) leave
711 * devices in a D3hot state at boot. Consequently, we need to
712 * restore at least the BARs so that the device will be
713 * accessible to its driver.
716 pci_restore_bars(dev
);
719 pcie_aspm_pm_state_change(dev
->bus
->self
);
725 * pci_update_current_state - Read power state of given device and cache it
726 * @dev: PCI device to handle.
727 * @state: State to cache in case the device doesn't have the PM capability
729 * The power state is read from the PMCSR register, which however is
730 * inaccessible in D3cold. The platform firmware is therefore queried first
731 * to detect accessibility of the register. In case the platform firmware
732 * reports an incorrect state or the device isn't power manageable by the
733 * platform at all, we try to detect D3cold by testing accessibility of the
734 * vendor ID in config space.
736 void pci_update_current_state(struct pci_dev
*dev
, pci_power_t state
)
738 if (platform_pci_get_power_state(dev
) == PCI_D3cold
||
739 !pci_device_is_present(dev
)) {
740 dev
->current_state
= PCI_D3cold
;
741 } else if (dev
->pm_cap
) {
744 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
745 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
747 dev
->current_state
= state
;
752 * pci_power_up - Put the given device into D0 forcibly
753 * @dev: PCI device to power up
755 void pci_power_up(struct pci_dev
*dev
)
757 if (platform_pci_power_manageable(dev
))
758 platform_pci_set_power_state(dev
, PCI_D0
);
760 pci_raw_set_power_state(dev
, PCI_D0
);
761 pci_update_current_state(dev
, PCI_D0
);
765 * pci_platform_power_transition - Use platform to change device power state
766 * @dev: PCI device to handle.
767 * @state: State to put the device into.
769 static int pci_platform_power_transition(struct pci_dev
*dev
, pci_power_t state
)
773 if (platform_pci_power_manageable(dev
)) {
774 error
= platform_pci_set_power_state(dev
, state
);
776 pci_update_current_state(dev
, state
);
780 if (error
&& !dev
->pm_cap
) /* Fall back to PCI_D0 */
781 dev
->current_state
= PCI_D0
;
787 * pci_wakeup - Wake up a PCI device
788 * @pci_dev: Device to handle.
789 * @ign: ignored parameter
791 static int pci_wakeup(struct pci_dev
*pci_dev
, void *ign
)
793 pci_wakeup_event(pci_dev
);
794 pm_request_resume(&pci_dev
->dev
);
799 * pci_wakeup_bus - Walk given bus and wake up devices on it
800 * @bus: Top bus of the subtree to walk.
802 static void pci_wakeup_bus(struct pci_bus
*bus
)
805 pci_walk_bus(bus
, pci_wakeup
, NULL
);
809 * __pci_start_power_transition - Start power transition of a PCI device
810 * @dev: PCI device to handle.
811 * @state: State to put the device into.
813 static void __pci_start_power_transition(struct pci_dev
*dev
, pci_power_t state
)
815 if (state
== PCI_D0
) {
816 pci_platform_power_transition(dev
, PCI_D0
);
818 * Mandatory power management transition delays, see
819 * PCI Express Base Specification Revision 2.0 Section
820 * 6.6.1: Conventional Reset. Do not delay for
821 * devices powered on/off by corresponding bridge,
822 * because have already delayed for the bridge.
824 if (dev
->runtime_d3cold
) {
825 if (dev
->d3cold_delay
)
826 msleep(dev
->d3cold_delay
);
828 * When powering on a bridge from D3cold, the
829 * whole hierarchy may be powered on into
830 * D0uninitialized state, resume them to give
831 * them a chance to suspend again
833 pci_wakeup_bus(dev
->subordinate
);
839 * __pci_dev_set_current_state - Set current state of a PCI device
840 * @dev: Device to handle
841 * @data: pointer to state to be set
843 static int __pci_dev_set_current_state(struct pci_dev
*dev
, void *data
)
845 pci_power_t state
= *(pci_power_t
*)data
;
847 dev
->current_state
= state
;
852 * __pci_bus_set_current_state - Walk given bus and set current state of devices
853 * @bus: Top bus of the subtree to walk.
854 * @state: state to be set
856 static void __pci_bus_set_current_state(struct pci_bus
*bus
, pci_power_t state
)
859 pci_walk_bus(bus
, __pci_dev_set_current_state
, &state
);
863 * __pci_complete_power_transition - Complete power transition of a PCI device
864 * @dev: PCI device to handle.
865 * @state: State to put the device into.
867 * This function should not be called directly by device drivers.
869 int __pci_complete_power_transition(struct pci_dev
*dev
, pci_power_t state
)
875 ret
= pci_platform_power_transition(dev
, state
);
876 /* Power off the bridge may power off the whole hierarchy */
877 if (!ret
&& state
== PCI_D3cold
)
878 __pci_bus_set_current_state(dev
->subordinate
, PCI_D3cold
);
881 EXPORT_SYMBOL_GPL(__pci_complete_power_transition
);
884 * pci_set_power_state - Set the power state of a PCI device
885 * @dev: PCI device to handle.
886 * @state: PCI power state (D0, D1, D2, D3hot) to put the device into.
888 * Transition a device to a new power state, using the platform firmware and/or
889 * the device's PCI PM registers.
892 * -EINVAL if the requested state is invalid.
893 * -EIO if device does not support PCI PM or its PM capabilities register has a
894 * wrong version, or device doesn't support the requested state.
895 * 0 if device already is in the requested state.
896 * 0 if device's power state has been successfully changed.
898 int pci_set_power_state(struct pci_dev
*dev
, pci_power_t state
)
902 /* bound the state we're entering */
903 if (state
> PCI_D3cold
)
905 else if (state
< PCI_D0
)
907 else if ((state
== PCI_D1
|| state
== PCI_D2
) && pci_no_d1d2(dev
))
909 * If the device or the parent bridge do not support PCI PM,
910 * ignore the request if we're doing anything other than putting
911 * it into D0 (which would only happen on boot).
915 /* Check if we're already there */
916 if (dev
->current_state
== state
)
919 __pci_start_power_transition(dev
, state
);
921 /* This device is quirked not to be put into D3, so
922 don't put it in D3 */
923 if (state
>= PCI_D3hot
&& (dev
->dev_flags
& PCI_DEV_FLAGS_NO_D3
))
927 * To put device in D3cold, we put device into D3hot in native
928 * way, then put device into D3cold with platform ops
930 error
= pci_raw_set_power_state(dev
, state
> PCI_D3hot
?
933 if (!__pci_complete_power_transition(dev
, state
))
938 EXPORT_SYMBOL(pci_set_power_state
);
941 * pci_choose_state - Choose the power state of a PCI device
942 * @dev: PCI device to be suspended
943 * @state: target sleep state for the whole system. This is the value
944 * that is passed to suspend() function.
946 * Returns PCI power state suitable for given device and given system
950 pci_power_t
pci_choose_state(struct pci_dev
*dev
, pm_message_t state
)
957 ret
= platform_pci_choose_state(dev
);
958 if (ret
!= PCI_POWER_ERROR
)
961 switch (state
.event
) {
964 case PM_EVENT_FREEZE
:
965 case PM_EVENT_PRETHAW
:
966 /* REVISIT both freeze and pre-thaw "should" use D0 */
967 case PM_EVENT_SUSPEND
:
968 case PM_EVENT_HIBERNATE
:
971 dev_info(&dev
->dev
, "unrecognized suspend event %d\n",
977 EXPORT_SYMBOL(pci_choose_state
);
979 #define PCI_EXP_SAVE_REGS 7
981 static struct pci_cap_saved_state
*_pci_find_saved_cap(struct pci_dev
*pci_dev
,
982 u16 cap
, bool extended
)
984 struct pci_cap_saved_state
*tmp
;
986 hlist_for_each_entry(tmp
, &pci_dev
->saved_cap_space
, next
) {
987 if (tmp
->cap
.cap_extended
== extended
&& tmp
->cap
.cap_nr
== cap
)
993 struct pci_cap_saved_state
*pci_find_saved_cap(struct pci_dev
*dev
, char cap
)
995 return _pci_find_saved_cap(dev
, cap
, false);
998 struct pci_cap_saved_state
*pci_find_saved_ext_cap(struct pci_dev
*dev
, u16 cap
)
1000 return _pci_find_saved_cap(dev
, cap
, true);
1003 static int pci_save_pcie_state(struct pci_dev
*dev
)
1006 struct pci_cap_saved_state
*save_state
;
1009 if (!pci_is_pcie(dev
))
1012 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1014 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1018 cap
= (u16
*)&save_state
->cap
.data
[0];
1019 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &cap
[i
++]);
1020 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL
, &cap
[i
++]);
1021 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL
, &cap
[i
++]);
1022 pcie_capability_read_word(dev
, PCI_EXP_RTCTL
, &cap
[i
++]);
1023 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL2
, &cap
[i
++]);
1024 pcie_capability_read_word(dev
, PCI_EXP_LNKCTL2
, &cap
[i
++]);
1025 pcie_capability_read_word(dev
, PCI_EXP_SLTCTL2
, &cap
[i
++]);
1030 static void pci_restore_pcie_state(struct pci_dev
*dev
)
1033 struct pci_cap_saved_state
*save_state
;
1036 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_EXP
);
1040 cap
= (u16
*)&save_state
->cap
.data
[0];
1041 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL
, cap
[i
++]);
1042 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL
, cap
[i
++]);
1043 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL
, cap
[i
++]);
1044 pcie_capability_write_word(dev
, PCI_EXP_RTCTL
, cap
[i
++]);
1045 pcie_capability_write_word(dev
, PCI_EXP_DEVCTL2
, cap
[i
++]);
1046 pcie_capability_write_word(dev
, PCI_EXP_LNKCTL2
, cap
[i
++]);
1047 pcie_capability_write_word(dev
, PCI_EXP_SLTCTL2
, cap
[i
++]);
1051 static int pci_save_pcix_state(struct pci_dev
*dev
)
1054 struct pci_cap_saved_state
*save_state
;
1056 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1060 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1062 dev_err(&dev
->dev
, "buffer not found in %s\n", __func__
);
1066 pci_read_config_word(dev
, pos
+ PCI_X_CMD
,
1067 (u16
*)save_state
->cap
.data
);
1072 static void pci_restore_pcix_state(struct pci_dev
*dev
)
1075 struct pci_cap_saved_state
*save_state
;
1078 save_state
= pci_find_saved_cap(dev
, PCI_CAP_ID_PCIX
);
1079 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1080 if (!save_state
|| !pos
)
1082 cap
= (u16
*)&save_state
->cap
.data
[0];
1084 pci_write_config_word(dev
, pos
+ PCI_X_CMD
, cap
[i
++]);
1089 * pci_save_state - save the PCI configuration space of a device before suspending
1090 * @dev: - PCI device that we're dealing with
1092 int pci_save_state(struct pci_dev
*dev
)
1095 /* XXX: 100% dword access ok here? */
1096 for (i
= 0; i
< 16; i
++)
1097 pci_read_config_dword(dev
, i
* 4, &dev
->saved_config_space
[i
]);
1098 dev
->state_saved
= true;
1100 i
= pci_save_pcie_state(dev
);
1104 i
= pci_save_pcix_state(dev
);
1108 return pci_save_vc_state(dev
);
1110 EXPORT_SYMBOL(pci_save_state
);
1112 static void pci_restore_config_dword(struct pci_dev
*pdev
, int offset
,
1113 u32 saved_val
, int retry
)
1117 pci_read_config_dword(pdev
, offset
, &val
);
1118 if (val
== saved_val
)
1122 dev_dbg(&pdev
->dev
, "restoring config space at offset %#x (was %#x, writing %#x)\n",
1123 offset
, val
, saved_val
);
1124 pci_write_config_dword(pdev
, offset
, saved_val
);
1128 pci_read_config_dword(pdev
, offset
, &val
);
1129 if (val
== saved_val
)
1136 static void pci_restore_config_space_range(struct pci_dev
*pdev
,
1137 int start
, int end
, int retry
)
1141 for (index
= end
; index
>= start
; index
--)
1142 pci_restore_config_dword(pdev
, 4 * index
,
1143 pdev
->saved_config_space
[index
],
1147 static void pci_restore_config_space(struct pci_dev
*pdev
)
1149 if (pdev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
) {
1150 pci_restore_config_space_range(pdev
, 10, 15, 0);
1151 /* Restore BARs before the command register. */
1152 pci_restore_config_space_range(pdev
, 4, 9, 10);
1153 pci_restore_config_space_range(pdev
, 0, 3, 0);
1155 pci_restore_config_space_range(pdev
, 0, 15, 0);
1160 * pci_restore_state - Restore the saved state of a PCI device
1161 * @dev: - PCI device that we're dealing with
1163 void pci_restore_state(struct pci_dev
*dev
)
1165 if (!dev
->state_saved
)
1168 /* PCI Express register must be restored first */
1169 pci_restore_pcie_state(dev
);
1170 pci_restore_pasid_state(dev
);
1171 pci_restore_pri_state(dev
);
1172 pci_restore_ats_state(dev
);
1173 pci_restore_vc_state(dev
);
1175 pci_cleanup_aer_error_status_regs(dev
);
1177 pci_restore_config_space(dev
);
1179 pci_restore_pcix_state(dev
);
1180 pci_restore_msi_state(dev
);
1182 /* Restore ACS and IOV configuration state */
1183 pci_enable_acs(dev
);
1184 pci_restore_iov_state(dev
);
1186 dev
->state_saved
= false;
1188 EXPORT_SYMBOL(pci_restore_state
);
1190 struct pci_saved_state
{
1191 u32 config_space
[16];
1192 struct pci_cap_saved_data cap
[0];
1196 * pci_store_saved_state - Allocate and return an opaque struct containing
1197 * the device saved state.
1198 * @dev: PCI device that we're dealing with
1200 * Return NULL if no state or error.
1202 struct pci_saved_state
*pci_store_saved_state(struct pci_dev
*dev
)
1204 struct pci_saved_state
*state
;
1205 struct pci_cap_saved_state
*tmp
;
1206 struct pci_cap_saved_data
*cap
;
1209 if (!dev
->state_saved
)
1212 size
= sizeof(*state
) + sizeof(struct pci_cap_saved_data
);
1214 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
)
1215 size
+= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1217 state
= kzalloc(size
, GFP_KERNEL
);
1221 memcpy(state
->config_space
, dev
->saved_config_space
,
1222 sizeof(state
->config_space
));
1225 hlist_for_each_entry(tmp
, &dev
->saved_cap_space
, next
) {
1226 size_t len
= sizeof(struct pci_cap_saved_data
) + tmp
->cap
.size
;
1227 memcpy(cap
, &tmp
->cap
, len
);
1228 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+ len
);
1230 /* Empty cap_save terminates list */
1234 EXPORT_SYMBOL_GPL(pci_store_saved_state
);
1237 * pci_load_saved_state - Reload the provided save state into struct pci_dev.
1238 * @dev: PCI device that we're dealing with
1239 * @state: Saved state returned from pci_store_saved_state()
1241 int pci_load_saved_state(struct pci_dev
*dev
,
1242 struct pci_saved_state
*state
)
1244 struct pci_cap_saved_data
*cap
;
1246 dev
->state_saved
= false;
1251 memcpy(dev
->saved_config_space
, state
->config_space
,
1252 sizeof(state
->config_space
));
1256 struct pci_cap_saved_state
*tmp
;
1258 tmp
= _pci_find_saved_cap(dev
, cap
->cap_nr
, cap
->cap_extended
);
1259 if (!tmp
|| tmp
->cap
.size
!= cap
->size
)
1262 memcpy(tmp
->cap
.data
, cap
->data
, tmp
->cap
.size
);
1263 cap
= (struct pci_cap_saved_data
*)((u8
*)cap
+
1264 sizeof(struct pci_cap_saved_data
) + cap
->size
);
1267 dev
->state_saved
= true;
1270 EXPORT_SYMBOL_GPL(pci_load_saved_state
);
1273 * pci_load_and_free_saved_state - Reload the save state pointed to by state,
1274 * and free the memory allocated for it.
1275 * @dev: PCI device that we're dealing with
1276 * @state: Pointer to saved state returned from pci_store_saved_state()
1278 int pci_load_and_free_saved_state(struct pci_dev
*dev
,
1279 struct pci_saved_state
**state
)
1281 int ret
= pci_load_saved_state(dev
, *state
);
1286 EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state
);
1288 int __weak
pcibios_enable_device(struct pci_dev
*dev
, int bars
)
1290 return pci_enable_resources(dev
, bars
);
1293 static int do_pci_enable_device(struct pci_dev
*dev
, int bars
)
1296 struct pci_dev
*bridge
;
1300 err
= pci_set_power_state(dev
, PCI_D0
);
1301 if (err
< 0 && err
!= -EIO
)
1304 bridge
= pci_upstream_bridge(dev
);
1306 pcie_aspm_powersave_config_link(bridge
);
1308 err
= pcibios_enable_device(dev
, bars
);
1311 pci_fixup_device(pci_fixup_enable
, dev
);
1313 if (dev
->msi_enabled
|| dev
->msix_enabled
)
1316 pci_read_config_byte(dev
, PCI_INTERRUPT_PIN
, &pin
);
1318 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1319 if (cmd
& PCI_COMMAND_INTX_DISABLE
)
1320 pci_write_config_word(dev
, PCI_COMMAND
,
1321 cmd
& ~PCI_COMMAND_INTX_DISABLE
);
1328 * pci_reenable_device - Resume abandoned device
1329 * @dev: PCI device to be resumed
1331 * Note this function is a backend of pci_default_resume and is not supposed
1332 * to be called by normal code, write proper resume handler and use it instead.
1334 int pci_reenable_device(struct pci_dev
*dev
)
1336 if (pci_is_enabled(dev
))
1337 return do_pci_enable_device(dev
, (1 << PCI_NUM_RESOURCES
) - 1);
1340 EXPORT_SYMBOL(pci_reenable_device
);
1342 static void pci_enable_bridge(struct pci_dev
*dev
)
1344 struct pci_dev
*bridge
;
1347 bridge
= pci_upstream_bridge(dev
);
1349 pci_enable_bridge(bridge
);
1351 if (pci_is_enabled(dev
)) {
1352 if (!dev
->is_busmaster
)
1353 pci_set_master(dev
);
1357 retval
= pci_enable_device(dev
);
1359 dev_err(&dev
->dev
, "Error enabling bridge (%d), continuing\n",
1361 pci_set_master(dev
);
1364 static int pci_enable_device_flags(struct pci_dev
*dev
, unsigned long flags
)
1366 struct pci_dev
*bridge
;
1371 * Power state could be unknown at this point, either due to a fresh
1372 * boot or a device removal call. So get the current power state
1373 * so that things like MSI message writing will behave as expected
1374 * (e.g. if the device really is in D0 at enable time).
1378 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1379 dev
->current_state
= (pmcsr
& PCI_PM_CTRL_STATE_MASK
);
1382 if (atomic_inc_return(&dev
->enable_cnt
) > 1)
1383 return 0; /* already enabled */
1385 bridge
= pci_upstream_bridge(dev
);
1387 pci_enable_bridge(bridge
);
1389 /* only skip sriov related */
1390 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
1391 if (dev
->resource
[i
].flags
& flags
)
1393 for (i
= PCI_BRIDGE_RESOURCES
; i
< DEVICE_COUNT_RESOURCE
; i
++)
1394 if (dev
->resource
[i
].flags
& flags
)
1397 err
= do_pci_enable_device(dev
, bars
);
1399 atomic_dec(&dev
->enable_cnt
);
1404 * pci_enable_device_io - Initialize a device for use with IO space
1405 * @dev: PCI device to be initialized
1407 * Initialize device before it's used by a driver. Ask low-level code
1408 * to enable I/O resources. Wake up the device if it was suspended.
1409 * Beware, this function can fail.
1411 int pci_enable_device_io(struct pci_dev
*dev
)
1413 return pci_enable_device_flags(dev
, IORESOURCE_IO
);
1415 EXPORT_SYMBOL(pci_enable_device_io
);
1418 * pci_enable_device_mem - Initialize a device for use with Memory space
1419 * @dev: PCI device to be initialized
1421 * Initialize device before it's used by a driver. Ask low-level code
1422 * to enable Memory resources. Wake up the device if it was suspended.
1423 * Beware, this function can fail.
1425 int pci_enable_device_mem(struct pci_dev
*dev
)
1427 return pci_enable_device_flags(dev
, IORESOURCE_MEM
);
1429 EXPORT_SYMBOL(pci_enable_device_mem
);
1432 * pci_enable_device - Initialize device before it's used by a driver.
1433 * @dev: PCI device to be initialized
1435 * Initialize device before it's used by a driver. Ask low-level code
1436 * to enable I/O and memory. Wake up the device if it was suspended.
1437 * Beware, this function can fail.
1439 * Note we don't actually enable the device many times if we call
1440 * this function repeatedly (we just increment the count).
1442 int pci_enable_device(struct pci_dev
*dev
)
1444 return pci_enable_device_flags(dev
, IORESOURCE_MEM
| IORESOURCE_IO
);
1446 EXPORT_SYMBOL(pci_enable_device
);
1449 * Managed PCI resources. This manages device on/off, intx/msi/msix
1450 * on/off and BAR regions. pci_dev itself records msi/msix status, so
1451 * there's no need to track it separately. pci_devres is initialized
1452 * when a device is enabled using managed PCI device enable interface.
1455 unsigned int enabled
:1;
1456 unsigned int pinned
:1;
1457 unsigned int orig_intx
:1;
1458 unsigned int restore_intx
:1;
1462 static void pcim_release(struct device
*gendev
, void *res
)
1464 struct pci_dev
*dev
= to_pci_dev(gendev
);
1465 struct pci_devres
*this = res
;
1468 if (dev
->msi_enabled
)
1469 pci_disable_msi(dev
);
1470 if (dev
->msix_enabled
)
1471 pci_disable_msix(dev
);
1473 for (i
= 0; i
< DEVICE_COUNT_RESOURCE
; i
++)
1474 if (this->region_mask
& (1 << i
))
1475 pci_release_region(dev
, i
);
1477 if (this->restore_intx
)
1478 pci_intx(dev
, this->orig_intx
);
1480 if (this->enabled
&& !this->pinned
)
1481 pci_disable_device(dev
);
1484 static struct pci_devres
*get_pci_dr(struct pci_dev
*pdev
)
1486 struct pci_devres
*dr
, *new_dr
;
1488 dr
= devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1492 new_dr
= devres_alloc(pcim_release
, sizeof(*new_dr
), GFP_KERNEL
);
1495 return devres_get(&pdev
->dev
, new_dr
, NULL
, NULL
);
1498 static struct pci_devres
*find_pci_dr(struct pci_dev
*pdev
)
1500 if (pci_is_managed(pdev
))
1501 return devres_find(&pdev
->dev
, pcim_release
, NULL
, NULL
);
1506 * pcim_enable_device - Managed pci_enable_device()
1507 * @pdev: PCI device to be initialized
1509 * Managed pci_enable_device().
1511 int pcim_enable_device(struct pci_dev
*pdev
)
1513 struct pci_devres
*dr
;
1516 dr
= get_pci_dr(pdev
);
1522 rc
= pci_enable_device(pdev
);
1524 pdev
->is_managed
= 1;
1529 EXPORT_SYMBOL(pcim_enable_device
);
1532 * pcim_pin_device - Pin managed PCI device
1533 * @pdev: PCI device to pin
1535 * Pin managed PCI device @pdev. Pinned device won't be disabled on
1536 * driver detach. @pdev must have been enabled with
1537 * pcim_enable_device().
1539 void pcim_pin_device(struct pci_dev
*pdev
)
1541 struct pci_devres
*dr
;
1543 dr
= find_pci_dr(pdev
);
1544 WARN_ON(!dr
|| !dr
->enabled
);
1548 EXPORT_SYMBOL(pcim_pin_device
);
1551 * pcibios_add_device - provide arch specific hooks when adding device dev
1552 * @dev: the PCI device being added
1554 * Permits the platform to provide architecture specific functionality when
1555 * devices are added. This is the default implementation. Architecture
1556 * implementations can override this.
1558 int __weak
pcibios_add_device(struct pci_dev
*dev
)
1564 * pcibios_release_device - provide arch specific hooks when releasing device dev
1565 * @dev: the PCI device being released
1567 * Permits the platform to provide architecture specific functionality when
1568 * devices are released. This is the default implementation. Architecture
1569 * implementations can override this.
1571 void __weak
pcibios_release_device(struct pci_dev
*dev
) {}
1574 * pcibios_disable_device - disable arch specific PCI resources for device dev
1575 * @dev: the PCI device to disable
1577 * Disables architecture specific PCI resources for the device. This
1578 * is the default implementation. Architecture implementations can
1581 void __weak
pcibios_disable_device(struct pci_dev
*dev
) {}
1584 * pcibios_penalize_isa_irq - penalize an ISA IRQ
1585 * @irq: ISA IRQ to penalize
1586 * @active: IRQ active or not
1588 * Permits the platform to provide architecture-specific functionality when
1589 * penalizing ISA IRQs. This is the default implementation. Architecture
1590 * implementations can override this.
1592 void __weak
pcibios_penalize_isa_irq(int irq
, int active
) {}
1594 static void do_pci_disable_device(struct pci_dev
*dev
)
1598 pci_read_config_word(dev
, PCI_COMMAND
, &pci_command
);
1599 if (pci_command
& PCI_COMMAND_MASTER
) {
1600 pci_command
&= ~PCI_COMMAND_MASTER
;
1601 pci_write_config_word(dev
, PCI_COMMAND
, pci_command
);
1604 pcibios_disable_device(dev
);
1608 * pci_disable_enabled_device - Disable device without updating enable_cnt
1609 * @dev: PCI device to disable
1611 * NOTE: This function is a backend of PCI power management routines and is
1612 * not supposed to be called drivers.
1614 void pci_disable_enabled_device(struct pci_dev
*dev
)
1616 if (pci_is_enabled(dev
))
1617 do_pci_disable_device(dev
);
1621 * pci_disable_device - Disable PCI device after use
1622 * @dev: PCI device to be disabled
1624 * Signal to the system that the PCI device is not in use by the system
1625 * anymore. This only involves disabling PCI bus-mastering, if active.
1627 * Note we don't actually disable the device until all callers of
1628 * pci_enable_device() have called pci_disable_device().
1630 void pci_disable_device(struct pci_dev
*dev
)
1632 struct pci_devres
*dr
;
1634 dr
= find_pci_dr(dev
);
1638 dev_WARN_ONCE(&dev
->dev
, atomic_read(&dev
->enable_cnt
) <= 0,
1639 "disabling already-disabled device");
1641 if (atomic_dec_return(&dev
->enable_cnt
) != 0)
1644 do_pci_disable_device(dev
);
1646 dev
->is_busmaster
= 0;
1648 EXPORT_SYMBOL(pci_disable_device
);
1651 * pcibios_set_pcie_reset_state - set reset state for device dev
1652 * @dev: the PCIe device reset
1653 * @state: Reset state to enter into
1656 * Sets the PCIe reset state for the device. This is the default
1657 * implementation. Architecture implementations can override this.
1659 int __weak
pcibios_set_pcie_reset_state(struct pci_dev
*dev
,
1660 enum pcie_reset_state state
)
1666 * pci_set_pcie_reset_state - set reset state for device dev
1667 * @dev: the PCIe device reset
1668 * @state: Reset state to enter into
1671 * Sets the PCI reset state for the device.
1673 int pci_set_pcie_reset_state(struct pci_dev
*dev
, enum pcie_reset_state state
)
1675 return pcibios_set_pcie_reset_state(dev
, state
);
1677 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state
);
1680 * pci_check_pme_status - Check if given device has generated PME.
1681 * @dev: Device to check.
1683 * Check the PME status of the device and if set, clear it and clear PME enable
1684 * (if set). Return 'true' if PME status and PME enable were both set or
1685 * 'false' otherwise.
1687 bool pci_check_pme_status(struct pci_dev
*dev
)
1696 pmcsr_pos
= dev
->pm_cap
+ PCI_PM_CTRL
;
1697 pci_read_config_word(dev
, pmcsr_pos
, &pmcsr
);
1698 if (!(pmcsr
& PCI_PM_CTRL_PME_STATUS
))
1701 /* Clear PME status. */
1702 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1703 if (pmcsr
& PCI_PM_CTRL_PME_ENABLE
) {
1704 /* Disable PME to avoid interrupt flood. */
1705 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1709 pci_write_config_word(dev
, pmcsr_pos
, pmcsr
);
1715 * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
1716 * @dev: Device to handle.
1717 * @pme_poll_reset: Whether or not to reset the device's pme_poll flag.
1719 * Check if @dev has generated PME and queue a resume request for it in that
1722 static int pci_pme_wakeup(struct pci_dev
*dev
, void *pme_poll_reset
)
1724 if (pme_poll_reset
&& dev
->pme_poll
)
1725 dev
->pme_poll
= false;
1727 if (pci_check_pme_status(dev
)) {
1728 pci_wakeup_event(dev
);
1729 pm_request_resume(&dev
->dev
);
1735 * pci_pme_wakeup_bus - Walk given bus and wake up devices on it, if necessary.
1736 * @bus: Top bus of the subtree to walk.
1738 void pci_pme_wakeup_bus(struct pci_bus
*bus
)
1741 pci_walk_bus(bus
, pci_pme_wakeup
, (void *)true);
1746 * pci_pme_capable - check the capability of PCI device to generate PME#
1747 * @dev: PCI device to handle.
1748 * @state: PCI state from which device will issue PME#.
1750 bool pci_pme_capable(struct pci_dev
*dev
, pci_power_t state
)
1755 return !!(dev
->pme_support
& (1 << state
));
1757 EXPORT_SYMBOL(pci_pme_capable
);
1759 static void pci_pme_list_scan(struct work_struct
*work
)
1761 struct pci_pme_device
*pme_dev
, *n
;
1763 mutex_lock(&pci_pme_list_mutex
);
1764 list_for_each_entry_safe(pme_dev
, n
, &pci_pme_list
, list
) {
1765 if (pme_dev
->dev
->pme_poll
) {
1766 struct pci_dev
*bridge
;
1768 bridge
= pme_dev
->dev
->bus
->self
;
1770 * If bridge is in low power state, the
1771 * configuration space of subordinate devices
1772 * may be not accessible
1774 if (bridge
&& bridge
->current_state
!= PCI_D0
)
1776 pci_pme_wakeup(pme_dev
->dev
, NULL
);
1778 list_del(&pme_dev
->list
);
1782 if (!list_empty(&pci_pme_list
))
1783 queue_delayed_work(system_freezable_wq
, &pci_pme_work
,
1784 msecs_to_jiffies(PME_TIMEOUT
));
1785 mutex_unlock(&pci_pme_list_mutex
);
1788 static void __pci_pme_active(struct pci_dev
*dev
, bool enable
)
1792 if (!dev
->pme_support
)
1795 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1796 /* Clear PME_Status by writing 1 to it and enable PME# */
1797 pmcsr
|= PCI_PM_CTRL_PME_STATUS
| PCI_PM_CTRL_PME_ENABLE
;
1799 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1801 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1805 * pci_pme_restore - Restore PME configuration after config space restore.
1806 * @dev: PCI device to update.
1808 void pci_pme_restore(struct pci_dev
*dev
)
1812 if (!dev
->pme_support
)
1815 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &pmcsr
);
1816 if (dev
->wakeup_prepared
) {
1817 pmcsr
|= PCI_PM_CTRL_PME_ENABLE
;
1818 pmcsr
&= ~PCI_PM_CTRL_PME_STATUS
;
1820 pmcsr
&= ~PCI_PM_CTRL_PME_ENABLE
;
1821 pmcsr
|= PCI_PM_CTRL_PME_STATUS
;
1823 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, pmcsr
);
1827 * pci_pme_active - enable or disable PCI device's PME# function
1828 * @dev: PCI device to handle.
1829 * @enable: 'true' to enable PME# generation; 'false' to disable it.
1831 * The caller must verify that the device is capable of generating PME# before
1832 * calling this function with @enable equal to 'true'.
1834 void pci_pme_active(struct pci_dev
*dev
, bool enable
)
1836 __pci_pme_active(dev
, enable
);
1839 * PCI (as opposed to PCIe) PME requires that the device have
1840 * its PME# line hooked up correctly. Not all hardware vendors
1841 * do this, so the PME never gets delivered and the device
1842 * remains asleep. The easiest way around this is to
1843 * periodically walk the list of suspended devices and check
1844 * whether any have their PME flag set. The assumption is that
1845 * we'll wake up often enough anyway that this won't be a huge
1846 * hit, and the power savings from the devices will still be a
1849 * Although PCIe uses in-band PME message instead of PME# line
1850 * to report PME, PME does not work for some PCIe devices in
1851 * reality. For example, there are devices that set their PME
1852 * status bits, but don't really bother to send a PME message;
1853 * there are PCI Express Root Ports that don't bother to
1854 * trigger interrupts when they receive PME messages from the
1855 * devices below. So PME poll is used for PCIe devices too.
1858 if (dev
->pme_poll
) {
1859 struct pci_pme_device
*pme_dev
;
1861 pme_dev
= kmalloc(sizeof(struct pci_pme_device
),
1864 dev_warn(&dev
->dev
, "can't enable PME#\n");
1868 mutex_lock(&pci_pme_list_mutex
);
1869 list_add(&pme_dev
->list
, &pci_pme_list
);
1870 if (list_is_singular(&pci_pme_list
))
1871 queue_delayed_work(system_freezable_wq
,
1873 msecs_to_jiffies(PME_TIMEOUT
));
1874 mutex_unlock(&pci_pme_list_mutex
);
1876 mutex_lock(&pci_pme_list_mutex
);
1877 list_for_each_entry(pme_dev
, &pci_pme_list
, list
) {
1878 if (pme_dev
->dev
== dev
) {
1879 list_del(&pme_dev
->list
);
1884 mutex_unlock(&pci_pme_list_mutex
);
1888 dev_dbg(&dev
->dev
, "PME# %s\n", enable
? "enabled" : "disabled");
1890 EXPORT_SYMBOL(pci_pme_active
);
1893 * pci_enable_wake - enable PCI device as wakeup event source
1894 * @dev: PCI device affected
1895 * @state: PCI state from which device will issue wakeup events
1896 * @enable: True to enable event generation; false to disable
1898 * This enables the device as a wakeup event source, or disables it.
1899 * When such events involves platform-specific hooks, those hooks are
1900 * called automatically by this routine.
1902 * Devices with legacy power management (no standard PCI PM capabilities)
1903 * always require such platform hooks.
1906 * 0 is returned on success
1907 * -EINVAL is returned if device is not supposed to wake up the system
1908 * Error code depending on the platform is returned if both the platform and
1909 * the native mechanism fail to enable the generation of wake-up events
1911 int pci_enable_wake(struct pci_dev
*dev
, pci_power_t state
, bool enable
)
1915 /* Don't do the same thing twice in a row for one device. */
1916 if (!!enable
== !!dev
->wakeup_prepared
)
1920 * According to "PCI System Architecture" 4th ed. by Tom Shanley & Don
1921 * Anderson we should be doing PME# wake enable followed by ACPI wake
1922 * enable. To disable wake-up we call the platform first, for symmetry.
1928 if (pci_pme_capable(dev
, state
))
1929 pci_pme_active(dev
, true);
1932 error
= platform_pci_set_wakeup(dev
, true);
1936 dev
->wakeup_prepared
= true;
1938 platform_pci_set_wakeup(dev
, false);
1939 pci_pme_active(dev
, false);
1940 dev
->wakeup_prepared
= false;
1945 EXPORT_SYMBOL(pci_enable_wake
);
1948 * pci_wake_from_d3 - enable/disable device to wake up from D3_hot or D3_cold
1949 * @dev: PCI device to prepare
1950 * @enable: True to enable wake-up event generation; false to disable
1952 * Many drivers want the device to wake up the system from D3_hot or D3_cold
1953 * and this function allows them to set that up cleanly - pci_enable_wake()
1954 * should not be called twice in a row to enable wake-up due to PCI PM vs ACPI
1955 * ordering constraints.
1957 * This function only returns error code if the device is not capable of
1958 * generating PME# from both D3_hot and D3_cold, and the platform is unable to
1959 * enable wake-up power for it.
1961 int pci_wake_from_d3(struct pci_dev
*dev
, bool enable
)
1963 return pci_pme_capable(dev
, PCI_D3cold
) ?
1964 pci_enable_wake(dev
, PCI_D3cold
, enable
) :
1965 pci_enable_wake(dev
, PCI_D3hot
, enable
);
1967 EXPORT_SYMBOL(pci_wake_from_d3
);
1970 * pci_target_state - find an appropriate low power state for a given PCI dev
1972 * @wakeup: Whether or not wakeup functionality will be enabled for the device.
1974 * Use underlying platform code to find a supported low power state for @dev.
1975 * If the platform can't manage @dev, return the deepest state from which it
1976 * can generate wake events, based on any available PME info.
1978 static pci_power_t
pci_target_state(struct pci_dev
*dev
, bool wakeup
)
1980 pci_power_t target_state
= PCI_D3hot
;
1982 if (platform_pci_power_manageable(dev
)) {
1984 * Call the platform to choose the target state of the device
1985 * and enable wake-up from this state if supported.
1987 pci_power_t state
= platform_pci_choose_state(dev
);
1990 case PCI_POWER_ERROR
:
1995 if (pci_no_d1d2(dev
))
1998 target_state
= state
;
2001 return target_state
;
2005 target_state
= PCI_D0
;
2008 * If the device is in D3cold even though it's not power-manageable by
2009 * the platform, it may have been powered down by non-standard means.
2010 * Best to let it slumber.
2012 if (dev
->current_state
== PCI_D3cold
)
2013 target_state
= PCI_D3cold
;
2017 * Find the deepest state from which the device can generate
2018 * wake-up events, make it the target state and enable device
2021 if (dev
->pme_support
) {
2023 && !(dev
->pme_support
& (1 << target_state
)))
2028 return target_state
;
2032 * pci_prepare_to_sleep - prepare PCI device for system-wide transition into a sleep state
2033 * @dev: Device to handle.
2035 * Choose the power state appropriate for the device depending on whether
2036 * it can wake up the system and/or is power manageable by the platform
2037 * (PCI_D3hot is the default) and put the device into that state.
2039 int pci_prepare_to_sleep(struct pci_dev
*dev
)
2041 bool wakeup
= device_may_wakeup(&dev
->dev
);
2042 pci_power_t target_state
= pci_target_state(dev
, wakeup
);
2045 if (target_state
== PCI_POWER_ERROR
)
2048 pci_enable_wake(dev
, target_state
, wakeup
);
2050 error
= pci_set_power_state(dev
, target_state
);
2053 pci_enable_wake(dev
, target_state
, false);
2057 EXPORT_SYMBOL(pci_prepare_to_sleep
);
2060 * pci_back_from_sleep - turn PCI device on during system-wide transition into working state
2061 * @dev: Device to handle.
2063 * Disable device's system wake-up capability and put it into D0.
2065 int pci_back_from_sleep(struct pci_dev
*dev
)
2067 pci_enable_wake(dev
, PCI_D0
, false);
2068 return pci_set_power_state(dev
, PCI_D0
);
2070 EXPORT_SYMBOL(pci_back_from_sleep
);
2073 * pci_finish_runtime_suspend - Carry out PCI-specific part of runtime suspend.
2074 * @dev: PCI device being suspended.
2076 * Prepare @dev to generate wake-up events at run time and put it into a low
2079 int pci_finish_runtime_suspend(struct pci_dev
*dev
)
2081 pci_power_t target_state
;
2084 target_state
= pci_target_state(dev
, device_can_wakeup(&dev
->dev
));
2085 if (target_state
== PCI_POWER_ERROR
)
2088 dev
->runtime_d3cold
= target_state
== PCI_D3cold
;
2090 pci_enable_wake(dev
, target_state
, pci_dev_run_wake(dev
));
2092 error
= pci_set_power_state(dev
, target_state
);
2095 pci_enable_wake(dev
, target_state
, false);
2096 dev
->runtime_d3cold
= false;
2103 * pci_dev_run_wake - Check if device can generate run-time wake-up events.
2104 * @dev: Device to check.
2106 * Return true if the device itself is capable of generating wake-up events
2107 * (through the platform or using the native PCIe PME) or if the device supports
2108 * PME and one of its upstream bridges can generate wake-up events.
2110 bool pci_dev_run_wake(struct pci_dev
*dev
)
2112 struct pci_bus
*bus
= dev
->bus
;
2114 if (device_can_wakeup(&dev
->dev
))
2117 if (!dev
->pme_support
)
2120 /* PME-capable in principle, but not from the target power state */
2121 if (!pci_pme_capable(dev
, pci_target_state(dev
, false)))
2124 while (bus
->parent
) {
2125 struct pci_dev
*bridge
= bus
->self
;
2127 if (device_can_wakeup(&bridge
->dev
))
2133 /* We have reached the root bus. */
2135 return device_can_wakeup(bus
->bridge
);
2139 EXPORT_SYMBOL_GPL(pci_dev_run_wake
);
2142 * pci_dev_keep_suspended - Check if the device can stay in the suspended state.
2143 * @pci_dev: Device to check.
2145 * Return 'true' if the device is runtime-suspended, it doesn't have to be
2146 * reconfigured due to wakeup settings difference between system and runtime
2147 * suspend and the current power state of it is suitable for the upcoming
2148 * (system) transition.
2150 * If the device is not configured for system wakeup, disable PME for it before
2151 * returning 'true' to prevent it from waking up the system unnecessarily.
2153 bool pci_dev_keep_suspended(struct pci_dev
*pci_dev
)
2155 struct device
*dev
= &pci_dev
->dev
;
2156 bool wakeup
= device_may_wakeup(dev
);
2158 if (!pm_runtime_suspended(dev
)
2159 || pci_target_state(pci_dev
, wakeup
) != pci_dev
->current_state
2160 || platform_pci_need_resume(pci_dev
)
2161 || (pci_dev
->dev_flags
& PCI_DEV_FLAGS_NEEDS_RESUME
))
2165 * At this point the device is good to go unless it's been configured
2166 * to generate PME at the runtime suspend time, but it is not supposed
2167 * to wake up the system. In that case, simply disable PME for it
2168 * (it will have to be re-enabled on exit from system resume).
2170 * If the device's power state is D3cold and the platform check above
2171 * hasn't triggered, the device's configuration is suitable and we don't
2172 * need to manipulate it at all.
2174 spin_lock_irq(&dev
->power
.lock
);
2176 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
&&
2178 __pci_pme_active(pci_dev
, false);
2180 spin_unlock_irq(&dev
->power
.lock
);
2185 * pci_dev_complete_resume - Finalize resume from system sleep for a device.
2186 * @pci_dev: Device to handle.
2188 * If the device is runtime suspended and wakeup-capable, enable PME for it as
2189 * it might have been disabled during the prepare phase of system suspend if
2190 * the device was not configured for system wakeup.
2192 void pci_dev_complete_resume(struct pci_dev
*pci_dev
)
2194 struct device
*dev
= &pci_dev
->dev
;
2196 if (!pci_dev_run_wake(pci_dev
))
2199 spin_lock_irq(&dev
->power
.lock
);
2201 if (pm_runtime_suspended(dev
) && pci_dev
->current_state
< PCI_D3cold
)
2202 __pci_pme_active(pci_dev
, true);
2204 spin_unlock_irq(&dev
->power
.lock
);
2207 void pci_config_pm_runtime_get(struct pci_dev
*pdev
)
2209 struct device
*dev
= &pdev
->dev
;
2210 struct device
*parent
= dev
->parent
;
2213 pm_runtime_get_sync(parent
);
2214 pm_runtime_get_noresume(dev
);
2216 * pdev->current_state is set to PCI_D3cold during suspending,
2217 * so wait until suspending completes
2219 pm_runtime_barrier(dev
);
2221 * Only need to resume devices in D3cold, because config
2222 * registers are still accessible for devices suspended but
2225 if (pdev
->current_state
== PCI_D3cold
)
2226 pm_runtime_resume(dev
);
2229 void pci_config_pm_runtime_put(struct pci_dev
*pdev
)
2231 struct device
*dev
= &pdev
->dev
;
2232 struct device
*parent
= dev
->parent
;
2234 pm_runtime_put(dev
);
2236 pm_runtime_put_sync(parent
);
2240 * pci_bridge_d3_possible - Is it possible to put the bridge into D3
2241 * @bridge: Bridge to check
2243 * This function checks if it is possible to move the bridge to D3.
2244 * Currently we only allow D3 for recent enough PCIe ports.
2246 bool pci_bridge_d3_possible(struct pci_dev
*bridge
)
2250 if (!pci_is_pcie(bridge
))
2253 switch (pci_pcie_type(bridge
)) {
2254 case PCI_EXP_TYPE_ROOT_PORT
:
2255 case PCI_EXP_TYPE_UPSTREAM
:
2256 case PCI_EXP_TYPE_DOWNSTREAM
:
2257 if (pci_bridge_d3_disable
)
2261 * Hotplug interrupts cannot be delivered if the link is down,
2262 * so parents of a hotplug port must stay awake. In addition,
2263 * hotplug ports handled by firmware in System Management Mode
2264 * may not be put into D3 by the OS (Thunderbolt on non-Macs).
2265 * For simplicity, disallow in general for now.
2267 if (bridge
->is_hotplug_bridge
)
2270 if (pci_bridge_d3_force
)
2274 * It should be safe to put PCIe ports from 2015 or newer
2277 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) &&
2287 static int pci_dev_check_d3cold(struct pci_dev
*dev
, void *data
)
2289 bool *d3cold_ok
= data
;
2291 if (/* The device needs to be allowed to go D3cold ... */
2292 dev
->no_d3cold
|| !dev
->d3cold_allowed
||
2294 /* ... and if it is wakeup capable to do so from D3cold. */
2295 (device_may_wakeup(&dev
->dev
) &&
2296 !pci_pme_capable(dev
, PCI_D3cold
)) ||
2298 /* If it is a bridge it must be allowed to go to D3. */
2299 !pci_power_manageable(dev
))
2307 * pci_bridge_d3_update - Update bridge D3 capabilities
2308 * @dev: PCI device which is changed
2310 * Update upstream bridge PM capabilities accordingly depending on if the
2311 * device PM configuration was changed or the device is being removed. The
2312 * change is also propagated upstream.
2314 void pci_bridge_d3_update(struct pci_dev
*dev
)
2316 bool remove
= !device_is_registered(&dev
->dev
);
2317 struct pci_dev
*bridge
;
2318 bool d3cold_ok
= true;
2320 bridge
= pci_upstream_bridge(dev
);
2321 if (!bridge
|| !pci_bridge_d3_possible(bridge
))
2325 * If D3 is currently allowed for the bridge, removing one of its
2326 * children won't change that.
2328 if (remove
&& bridge
->bridge_d3
)
2332 * If D3 is currently allowed for the bridge and a child is added or
2333 * changed, disallowance of D3 can only be caused by that child, so
2334 * we only need to check that single device, not any of its siblings.
2336 * If D3 is currently not allowed for the bridge, checking the device
2337 * first may allow us to skip checking its siblings.
2340 pci_dev_check_d3cold(dev
, &d3cold_ok
);
2343 * If D3 is currently not allowed for the bridge, this may be caused
2344 * either by the device being changed/removed or any of its siblings,
2345 * so we need to go through all children to find out if one of them
2346 * continues to block D3.
2348 if (d3cold_ok
&& !bridge
->bridge_d3
)
2349 pci_walk_bus(bridge
->subordinate
, pci_dev_check_d3cold
,
2352 if (bridge
->bridge_d3
!= d3cold_ok
) {
2353 bridge
->bridge_d3
= d3cold_ok
;
2354 /* Propagate change to upstream bridges */
2355 pci_bridge_d3_update(bridge
);
2360 * pci_d3cold_enable - Enable D3cold for device
2361 * @dev: PCI device to handle
2363 * This function can be used in drivers to enable D3cold from the device
2364 * they handle. It also updates upstream PCI bridge PM capabilities
2367 void pci_d3cold_enable(struct pci_dev
*dev
)
2369 if (dev
->no_d3cold
) {
2370 dev
->no_d3cold
= false;
2371 pci_bridge_d3_update(dev
);
2374 EXPORT_SYMBOL_GPL(pci_d3cold_enable
);
2377 * pci_d3cold_disable - Disable D3cold for device
2378 * @dev: PCI device to handle
2380 * This function can be used in drivers to disable D3cold from the device
2381 * they handle. It also updates upstream PCI bridge PM capabilities
2384 void pci_d3cold_disable(struct pci_dev
*dev
)
2386 if (!dev
->no_d3cold
) {
2387 dev
->no_d3cold
= true;
2388 pci_bridge_d3_update(dev
);
2391 EXPORT_SYMBOL_GPL(pci_d3cold_disable
);
2394 * pci_pm_init - Initialize PM functions of given PCI device
2395 * @dev: PCI device to handle.
2397 void pci_pm_init(struct pci_dev
*dev
)
2402 pm_runtime_forbid(&dev
->dev
);
2403 pm_runtime_set_active(&dev
->dev
);
2404 pm_runtime_enable(&dev
->dev
);
2405 device_enable_async_suspend(&dev
->dev
);
2406 dev
->wakeup_prepared
= false;
2409 dev
->pme_support
= 0;
2411 /* find PCI PM capability in list */
2412 pm
= pci_find_capability(dev
, PCI_CAP_ID_PM
);
2415 /* Check device's ability to generate PME# */
2416 pci_read_config_word(dev
, pm
+ PCI_PM_PMC
, &pmc
);
2418 if ((pmc
& PCI_PM_CAP_VER_MASK
) > 3) {
2419 dev_err(&dev
->dev
, "unsupported PM cap regs version (%u)\n",
2420 pmc
& PCI_PM_CAP_VER_MASK
);
2425 dev
->d3_delay
= PCI_PM_D3_WAIT
;
2426 dev
->d3cold_delay
= PCI_PM_D3COLD_WAIT
;
2427 dev
->bridge_d3
= pci_bridge_d3_possible(dev
);
2428 dev
->d3cold_allowed
= true;
2430 dev
->d1_support
= false;
2431 dev
->d2_support
= false;
2432 if (!pci_no_d1d2(dev
)) {
2433 if (pmc
& PCI_PM_CAP_D1
)
2434 dev
->d1_support
= true;
2435 if (pmc
& PCI_PM_CAP_D2
)
2436 dev
->d2_support
= true;
2438 if (dev
->d1_support
|| dev
->d2_support
)
2439 dev_printk(KERN_DEBUG
, &dev
->dev
, "supports%s%s\n",
2440 dev
->d1_support
? " D1" : "",
2441 dev
->d2_support
? " D2" : "");
2444 pmc
&= PCI_PM_CAP_PME_MASK
;
2446 dev_printk(KERN_DEBUG
, &dev
->dev
,
2447 "PME# supported from%s%s%s%s%s\n",
2448 (pmc
& PCI_PM_CAP_PME_D0
) ? " D0" : "",
2449 (pmc
& PCI_PM_CAP_PME_D1
) ? " D1" : "",
2450 (pmc
& PCI_PM_CAP_PME_D2
) ? " D2" : "",
2451 (pmc
& PCI_PM_CAP_PME_D3
) ? " D3hot" : "",
2452 (pmc
& PCI_PM_CAP_PME_D3cold
) ? " D3cold" : "");
2453 dev
->pme_support
= pmc
>> PCI_PM_CAP_PME_SHIFT
;
2454 dev
->pme_poll
= true;
2456 * Make device's PM flags reflect the wake-up capability, but
2457 * let the user space enable it to wake up the system as needed.
2459 device_set_wakeup_capable(&dev
->dev
, true);
2460 /* Disable the PME# generation functionality */
2461 pci_pme_active(dev
, false);
2465 static unsigned long pci_ea_flags(struct pci_dev
*dev
, u8 prop
)
2467 unsigned long flags
= IORESOURCE_PCI_FIXED
| IORESOURCE_PCI_EA_BEI
;
2471 case PCI_EA_P_VF_MEM
:
2472 flags
|= IORESOURCE_MEM
;
2474 case PCI_EA_P_MEM_PREFETCH
:
2475 case PCI_EA_P_VF_MEM_PREFETCH
:
2476 flags
|= IORESOURCE_MEM
| IORESOURCE_PREFETCH
;
2479 flags
|= IORESOURCE_IO
;
2488 static struct resource
*pci_ea_get_resource(struct pci_dev
*dev
, u8 bei
,
2491 if (bei
<= PCI_EA_BEI_BAR5
&& prop
<= PCI_EA_P_IO
)
2492 return &dev
->resource
[bei
];
2493 #ifdef CONFIG_PCI_IOV
2494 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
&&
2495 (prop
== PCI_EA_P_VF_MEM
|| prop
== PCI_EA_P_VF_MEM_PREFETCH
))
2496 return &dev
->resource
[PCI_IOV_RESOURCES
+
2497 bei
- PCI_EA_BEI_VF_BAR0
];
2499 else if (bei
== PCI_EA_BEI_ROM
)
2500 return &dev
->resource
[PCI_ROM_RESOURCE
];
2505 /* Read an Enhanced Allocation (EA) entry */
2506 static int pci_ea_read(struct pci_dev
*dev
, int offset
)
2508 struct resource
*res
;
2509 int ent_size
, ent_offset
= offset
;
2510 resource_size_t start
, end
;
2511 unsigned long flags
;
2512 u32 dw0
, bei
, base
, max_offset
;
2514 bool support_64
= (sizeof(resource_size_t
) >= 8);
2516 pci_read_config_dword(dev
, ent_offset
, &dw0
);
2519 /* Entry size field indicates DWORDs after 1st */
2520 ent_size
= ((dw0
& PCI_EA_ES
) + 1) << 2;
2522 if (!(dw0
& PCI_EA_ENABLE
)) /* Entry not enabled */
2525 bei
= (dw0
& PCI_EA_BEI
) >> 4;
2526 prop
= (dw0
& PCI_EA_PP
) >> 8;
2529 * If the Property is in the reserved range, try the Secondary
2532 if (prop
> PCI_EA_P_BRIDGE_IO
&& prop
< PCI_EA_P_MEM_RESERVED
)
2533 prop
= (dw0
& PCI_EA_SP
) >> 16;
2534 if (prop
> PCI_EA_P_BRIDGE_IO
)
2537 res
= pci_ea_get_resource(dev
, bei
, prop
);
2539 dev_err(&dev
->dev
, "Unsupported EA entry BEI: %u\n", bei
);
2543 flags
= pci_ea_flags(dev
, prop
);
2545 dev_err(&dev
->dev
, "Unsupported EA properties: %#x\n", prop
);
2550 pci_read_config_dword(dev
, ent_offset
, &base
);
2551 start
= (base
& PCI_EA_FIELD_MASK
);
2554 /* Read MaxOffset */
2555 pci_read_config_dword(dev
, ent_offset
, &max_offset
);
2558 /* Read Base MSBs (if 64-bit entry) */
2559 if (base
& PCI_EA_IS_64
) {
2562 pci_read_config_dword(dev
, ent_offset
, &base_upper
);
2565 flags
|= IORESOURCE_MEM_64
;
2567 /* entry starts above 32-bit boundary, can't use */
2568 if (!support_64
&& base_upper
)
2572 start
|= ((u64
)base_upper
<< 32);
2575 end
= start
+ (max_offset
| 0x03);
2577 /* Read MaxOffset MSBs (if 64-bit entry) */
2578 if (max_offset
& PCI_EA_IS_64
) {
2579 u32 max_offset_upper
;
2581 pci_read_config_dword(dev
, ent_offset
, &max_offset_upper
);
2584 flags
|= IORESOURCE_MEM_64
;
2586 /* entry too big, can't use */
2587 if (!support_64
&& max_offset_upper
)
2591 end
+= ((u64
)max_offset_upper
<< 32);
2595 dev_err(&dev
->dev
, "EA Entry crosses address boundary\n");
2599 if (ent_size
!= ent_offset
- offset
) {
2601 "EA Entry Size (%d) does not match length read (%d)\n",
2602 ent_size
, ent_offset
- offset
);
2606 res
->name
= pci_name(dev
);
2611 if (bei
<= PCI_EA_BEI_BAR5
)
2612 dev_printk(KERN_DEBUG
, &dev
->dev
, "BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2614 else if (bei
== PCI_EA_BEI_ROM
)
2615 dev_printk(KERN_DEBUG
, &dev
->dev
, "ROM: %pR (from Enhanced Allocation, properties %#02x)\n",
2617 else if (bei
>= PCI_EA_BEI_VF_BAR0
&& bei
<= PCI_EA_BEI_VF_BAR5
)
2618 dev_printk(KERN_DEBUG
, &dev
->dev
, "VF BAR %d: %pR (from Enhanced Allocation, properties %#02x)\n",
2619 bei
- PCI_EA_BEI_VF_BAR0
, res
, prop
);
2621 dev_printk(KERN_DEBUG
, &dev
->dev
, "BEI %d res: %pR (from Enhanced Allocation, properties %#02x)\n",
2625 return offset
+ ent_size
;
2628 /* Enhanced Allocation Initialization */
2629 void pci_ea_init(struct pci_dev
*dev
)
2636 /* find PCI EA capability in list */
2637 ea
= pci_find_capability(dev
, PCI_CAP_ID_EA
);
2641 /* determine the number of entries */
2642 pci_bus_read_config_byte(dev
->bus
, dev
->devfn
, ea
+ PCI_EA_NUM_ENT
,
2644 num_ent
&= PCI_EA_NUM_ENT_MASK
;
2646 offset
= ea
+ PCI_EA_FIRST_ENT
;
2648 /* Skip DWORD 2 for type 1 functions */
2649 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
)
2652 /* parse each EA entry */
2653 for (i
= 0; i
< num_ent
; ++i
)
2654 offset
= pci_ea_read(dev
, offset
);
2657 static void pci_add_saved_cap(struct pci_dev
*pci_dev
,
2658 struct pci_cap_saved_state
*new_cap
)
2660 hlist_add_head(&new_cap
->next
, &pci_dev
->saved_cap_space
);
2664 * _pci_add_cap_save_buffer - allocate buffer for saving given
2665 * capability registers
2666 * @dev: the PCI device
2667 * @cap: the capability to allocate the buffer for
2668 * @extended: Standard or Extended capability ID
2669 * @size: requested size of the buffer
2671 static int _pci_add_cap_save_buffer(struct pci_dev
*dev
, u16 cap
,
2672 bool extended
, unsigned int size
)
2675 struct pci_cap_saved_state
*save_state
;
2678 pos
= pci_find_ext_capability(dev
, cap
);
2680 pos
= pci_find_capability(dev
, cap
);
2685 save_state
= kzalloc(sizeof(*save_state
) + size
, GFP_KERNEL
);
2689 save_state
->cap
.cap_nr
= cap
;
2690 save_state
->cap
.cap_extended
= extended
;
2691 save_state
->cap
.size
= size
;
2692 pci_add_saved_cap(dev
, save_state
);
2697 int pci_add_cap_save_buffer(struct pci_dev
*dev
, char cap
, unsigned int size
)
2699 return _pci_add_cap_save_buffer(dev
, cap
, false, size
);
2702 int pci_add_ext_cap_save_buffer(struct pci_dev
*dev
, u16 cap
, unsigned int size
)
2704 return _pci_add_cap_save_buffer(dev
, cap
, true, size
);
2708 * pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
2709 * @dev: the PCI device
2711 void pci_allocate_cap_save_buffers(struct pci_dev
*dev
)
2715 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_EXP
,
2716 PCI_EXP_SAVE_REGS
* sizeof(u16
));
2719 "unable to preallocate PCI Express save buffer\n");
2721 error
= pci_add_cap_save_buffer(dev
, PCI_CAP_ID_PCIX
, sizeof(u16
));
2724 "unable to preallocate PCI-X save buffer\n");
2726 pci_allocate_vc_save_buffers(dev
);
2729 void pci_free_cap_save_buffers(struct pci_dev
*dev
)
2731 struct pci_cap_saved_state
*tmp
;
2732 struct hlist_node
*n
;
2734 hlist_for_each_entry_safe(tmp
, n
, &dev
->saved_cap_space
, next
)
2739 * pci_configure_ari - enable or disable ARI forwarding
2740 * @dev: the PCI device
2742 * If @dev and its upstream bridge both support ARI, enable ARI in the
2743 * bridge. Otherwise, disable ARI in the bridge.
2745 void pci_configure_ari(struct pci_dev
*dev
)
2748 struct pci_dev
*bridge
;
2750 if (pcie_ari_disabled
|| !pci_is_pcie(dev
) || dev
->devfn
)
2753 bridge
= dev
->bus
->self
;
2757 pcie_capability_read_dword(bridge
, PCI_EXP_DEVCAP2
, &cap
);
2758 if (!(cap
& PCI_EXP_DEVCAP2_ARI
))
2761 if (pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
)) {
2762 pcie_capability_set_word(bridge
, PCI_EXP_DEVCTL2
,
2763 PCI_EXP_DEVCTL2_ARI
);
2764 bridge
->ari_enabled
= 1;
2766 pcie_capability_clear_word(bridge
, PCI_EXP_DEVCTL2
,
2767 PCI_EXP_DEVCTL2_ARI
);
2768 bridge
->ari_enabled
= 0;
2772 static int pci_acs_enable
;
2775 * pci_request_acs - ask for ACS to be enabled if supported
2777 void pci_request_acs(void)
2783 * pci_std_enable_acs - enable ACS on devices using standard ACS capabilites
2784 * @dev: the PCI device
2786 static void pci_std_enable_acs(struct pci_dev
*dev
)
2792 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ACS
);
2796 pci_read_config_word(dev
, pos
+ PCI_ACS_CAP
, &cap
);
2797 pci_read_config_word(dev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2799 /* Source Validation */
2800 ctrl
|= (cap
& PCI_ACS_SV
);
2802 /* P2P Request Redirect */
2803 ctrl
|= (cap
& PCI_ACS_RR
);
2805 /* P2P Completion Redirect */
2806 ctrl
|= (cap
& PCI_ACS_CR
);
2808 /* Upstream Forwarding */
2809 ctrl
|= (cap
& PCI_ACS_UF
);
2811 pci_write_config_word(dev
, pos
+ PCI_ACS_CTRL
, ctrl
);
2815 * pci_enable_acs - enable ACS if hardware support it
2816 * @dev: the PCI device
2818 void pci_enable_acs(struct pci_dev
*dev
)
2820 if (!pci_acs_enable
)
2823 if (!pci_dev_specific_enable_acs(dev
))
2826 pci_std_enable_acs(dev
);
2829 static bool pci_acs_flags_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2834 pos
= pci_find_ext_capability(pdev
, PCI_EXT_CAP_ID_ACS
);
2839 * Except for egress control, capabilities are either required
2840 * or only required if controllable. Features missing from the
2841 * capability field can therefore be assumed as hard-wired enabled.
2843 pci_read_config_word(pdev
, pos
+ PCI_ACS_CAP
, &cap
);
2844 acs_flags
&= (cap
| PCI_ACS_EC
);
2846 pci_read_config_word(pdev
, pos
+ PCI_ACS_CTRL
, &ctrl
);
2847 return (ctrl
& acs_flags
) == acs_flags
;
2851 * pci_acs_enabled - test ACS against required flags for a given device
2852 * @pdev: device to test
2853 * @acs_flags: required PCI ACS flags
2855 * Return true if the device supports the provided flags. Automatically
2856 * filters out flags that are not implemented on multifunction devices.
2858 * Note that this interface checks the effective ACS capabilities of the
2859 * device rather than the actual capabilities. For instance, most single
2860 * function endpoints are not required to support ACS because they have no
2861 * opportunity for peer-to-peer access. We therefore return 'true'
2862 * regardless of whether the device exposes an ACS capability. This makes
2863 * it much easier for callers of this function to ignore the actual type
2864 * or topology of the device when testing ACS support.
2866 bool pci_acs_enabled(struct pci_dev
*pdev
, u16 acs_flags
)
2870 ret
= pci_dev_specific_acs_enabled(pdev
, acs_flags
);
2875 * Conventional PCI and PCI-X devices never support ACS, either
2876 * effectively or actually. The shared bus topology implies that
2877 * any device on the bus can receive or snoop DMA.
2879 if (!pci_is_pcie(pdev
))
2882 switch (pci_pcie_type(pdev
)) {
2884 * PCI/X-to-PCIe bridges are not specifically mentioned by the spec,
2885 * but since their primary interface is PCI/X, we conservatively
2886 * handle them as we would a non-PCIe device.
2888 case PCI_EXP_TYPE_PCIE_BRIDGE
:
2890 * PCIe 3.0, 6.12.1 excludes ACS on these devices. "ACS is never
2891 * applicable... must never implement an ACS Extended Capability...".
2892 * This seems arbitrary, but we take a conservative interpretation
2893 * of this statement.
2895 case PCI_EXP_TYPE_PCI_BRIDGE
:
2896 case PCI_EXP_TYPE_RC_EC
:
2899 * PCIe 3.0, 6.12.1.1 specifies that downstream and root ports should
2900 * implement ACS in order to indicate their peer-to-peer capabilities,
2901 * regardless of whether they are single- or multi-function devices.
2903 case PCI_EXP_TYPE_DOWNSTREAM
:
2904 case PCI_EXP_TYPE_ROOT_PORT
:
2905 return pci_acs_flags_enabled(pdev
, acs_flags
);
2907 * PCIe 3.0, 6.12.1.2 specifies ACS capabilities that should be
2908 * implemented by the remaining PCIe types to indicate peer-to-peer
2909 * capabilities, but only when they are part of a multifunction
2910 * device. The footnote for section 6.12 indicates the specific
2911 * PCIe types included here.
2913 case PCI_EXP_TYPE_ENDPOINT
:
2914 case PCI_EXP_TYPE_UPSTREAM
:
2915 case PCI_EXP_TYPE_LEG_END
:
2916 case PCI_EXP_TYPE_RC_END
:
2917 if (!pdev
->multifunction
)
2920 return pci_acs_flags_enabled(pdev
, acs_flags
);
2924 * PCIe 3.0, 6.12.1.3 specifies no ACS capabilities are applicable
2925 * to single function devices with the exception of downstream ports.
2931 * pci_acs_path_enable - test ACS flags from start to end in a hierarchy
2932 * @start: starting downstream device
2933 * @end: ending upstream device or NULL to search to the root bus
2934 * @acs_flags: required flags
2936 * Walk up a device tree from start to end testing PCI ACS support. If
2937 * any step along the way does not support the required flags, return false.
2939 bool pci_acs_path_enabled(struct pci_dev
*start
,
2940 struct pci_dev
*end
, u16 acs_flags
)
2942 struct pci_dev
*pdev
, *parent
= start
;
2947 if (!pci_acs_enabled(pdev
, acs_flags
))
2950 if (pci_is_root_bus(pdev
->bus
))
2951 return (end
== NULL
);
2953 parent
= pdev
->bus
->self
;
2954 } while (pdev
!= end
);
2960 * pci_swizzle_interrupt_pin - swizzle INTx for device behind bridge
2961 * @dev: the PCI device
2962 * @pin: the INTx pin (1=INTA, 2=INTB, 3=INTC, 4=INTD)
2964 * Perform INTx swizzling for a device behind one level of bridge. This is
2965 * required by section 9.1 of the PCI-to-PCI bridge specification for devices
2966 * behind bridges on add-in cards. For devices with ARI enabled, the slot
2967 * number is always 0 (see the Implementation Note in section 2.2.8.1 of
2968 * the PCI Express Base Specification, Revision 2.1)
2970 u8
pci_swizzle_interrupt_pin(const struct pci_dev
*dev
, u8 pin
)
2974 if (pci_ari_enabled(dev
->bus
))
2977 slot
= PCI_SLOT(dev
->devfn
);
2979 return (((pin
- 1) + slot
) % 4) + 1;
2982 int pci_get_interrupt_pin(struct pci_dev
*dev
, struct pci_dev
**bridge
)
2990 while (!pci_is_root_bus(dev
->bus
)) {
2991 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
2992 dev
= dev
->bus
->self
;
2999 * pci_common_swizzle - swizzle INTx all the way to root bridge
3000 * @dev: the PCI device
3001 * @pinp: pointer to the INTx pin value (1=INTA, 2=INTB, 3=INTD, 4=INTD)
3003 * Perform INTx swizzling for a device. This traverses through all PCI-to-PCI
3004 * bridges all the way up to a PCI root bus.
3006 u8
pci_common_swizzle(struct pci_dev
*dev
, u8
*pinp
)
3010 while (!pci_is_root_bus(dev
->bus
)) {
3011 pin
= pci_swizzle_interrupt_pin(dev
, pin
);
3012 dev
= dev
->bus
->self
;
3015 return PCI_SLOT(dev
->devfn
);
3017 EXPORT_SYMBOL_GPL(pci_common_swizzle
);
3020 * pci_release_region - Release a PCI bar
3021 * @pdev: PCI device whose resources were previously reserved by pci_request_region
3022 * @bar: BAR to release
3024 * Releases the PCI I/O and memory resources previously reserved by a
3025 * successful call to pci_request_region. Call this function only
3026 * after all use of the PCI regions has ceased.
3028 void pci_release_region(struct pci_dev
*pdev
, int bar
)
3030 struct pci_devres
*dr
;
3032 if (pci_resource_len(pdev
, bar
) == 0)
3034 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
)
3035 release_region(pci_resource_start(pdev
, bar
),
3036 pci_resource_len(pdev
, bar
));
3037 else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
)
3038 release_mem_region(pci_resource_start(pdev
, bar
),
3039 pci_resource_len(pdev
, bar
));
3041 dr
= find_pci_dr(pdev
);
3043 dr
->region_mask
&= ~(1 << bar
);
3045 EXPORT_SYMBOL(pci_release_region
);
3048 * __pci_request_region - Reserved PCI I/O and memory resource
3049 * @pdev: PCI device whose resources are to be reserved
3050 * @bar: BAR to be reserved
3051 * @res_name: Name to be associated with resource.
3052 * @exclusive: whether the region access is exclusive or not
3054 * Mark the PCI region associated with PCI device @pdev BR @bar as
3055 * being reserved by owner @res_name. Do not access any
3056 * address inside the PCI regions unless this call returns
3059 * If @exclusive is set, then the region is marked so that userspace
3060 * is explicitly not allowed to map the resource via /dev/mem or
3061 * sysfs MMIO access.
3063 * Returns 0 on success, or %EBUSY on error. A warning
3064 * message is also printed on failure.
3066 static int __pci_request_region(struct pci_dev
*pdev
, int bar
,
3067 const char *res_name
, int exclusive
)
3069 struct pci_devres
*dr
;
3071 if (pci_resource_len(pdev
, bar
) == 0)
3074 if (pci_resource_flags(pdev
, bar
) & IORESOURCE_IO
) {
3075 if (!request_region(pci_resource_start(pdev
, bar
),
3076 pci_resource_len(pdev
, bar
), res_name
))
3078 } else if (pci_resource_flags(pdev
, bar
) & IORESOURCE_MEM
) {
3079 if (!__request_mem_region(pci_resource_start(pdev
, bar
),
3080 pci_resource_len(pdev
, bar
), res_name
,
3085 dr
= find_pci_dr(pdev
);
3087 dr
->region_mask
|= 1 << bar
;
3092 dev_warn(&pdev
->dev
, "BAR %d: can't reserve %pR\n", bar
,
3093 &pdev
->resource
[bar
]);
3098 * pci_request_region - Reserve PCI I/O and memory resource
3099 * @pdev: PCI device whose resources are to be reserved
3100 * @bar: BAR to be reserved
3101 * @res_name: Name to be associated with resource
3103 * Mark the PCI region associated with PCI device @pdev BAR @bar as
3104 * being reserved by owner @res_name. Do not access any
3105 * address inside the PCI regions unless this call returns
3108 * Returns 0 on success, or %EBUSY on error. A warning
3109 * message is also printed on failure.
3111 int pci_request_region(struct pci_dev
*pdev
, int bar
, const char *res_name
)
3113 return __pci_request_region(pdev
, bar
, res_name
, 0);
3115 EXPORT_SYMBOL(pci_request_region
);
3118 * pci_request_region_exclusive - Reserved PCI I/O and memory resource
3119 * @pdev: PCI device whose resources are to be reserved
3120 * @bar: BAR to be reserved
3121 * @res_name: Name to be associated with resource.
3123 * Mark the PCI region associated with PCI device @pdev BR @bar as
3124 * being reserved by owner @res_name. Do not access any
3125 * address inside the PCI regions unless this call returns
3128 * Returns 0 on success, or %EBUSY on error. A warning
3129 * message is also printed on failure.
3131 * The key difference that _exclusive makes it that userspace is
3132 * explicitly not allowed to map the resource via /dev/mem or
3135 int pci_request_region_exclusive(struct pci_dev
*pdev
, int bar
,
3136 const char *res_name
)
3138 return __pci_request_region(pdev
, bar
, res_name
, IORESOURCE_EXCLUSIVE
);
3140 EXPORT_SYMBOL(pci_request_region_exclusive
);
3143 * pci_release_selected_regions - Release selected PCI I/O and memory resources
3144 * @pdev: PCI device whose resources were previously reserved
3145 * @bars: Bitmask of BARs to be released
3147 * Release selected PCI I/O and memory resources previously reserved.
3148 * Call this function only after all use of the PCI regions has ceased.
3150 void pci_release_selected_regions(struct pci_dev
*pdev
, int bars
)
3154 for (i
= 0; i
< 6; i
++)
3155 if (bars
& (1 << i
))
3156 pci_release_region(pdev
, i
);
3158 EXPORT_SYMBOL(pci_release_selected_regions
);
3160 static int __pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3161 const char *res_name
, int excl
)
3165 for (i
= 0; i
< 6; i
++)
3166 if (bars
& (1 << i
))
3167 if (__pci_request_region(pdev
, i
, res_name
, excl
))
3173 if (bars
& (1 << i
))
3174 pci_release_region(pdev
, i
);
3181 * pci_request_selected_regions - Reserve selected PCI I/O and memory resources
3182 * @pdev: PCI device whose resources are to be reserved
3183 * @bars: Bitmask of BARs to be requested
3184 * @res_name: Name to be associated with resource
3186 int pci_request_selected_regions(struct pci_dev
*pdev
, int bars
,
3187 const char *res_name
)
3189 return __pci_request_selected_regions(pdev
, bars
, res_name
, 0);
3191 EXPORT_SYMBOL(pci_request_selected_regions
);
3193 int pci_request_selected_regions_exclusive(struct pci_dev
*pdev
, int bars
,
3194 const char *res_name
)
3196 return __pci_request_selected_regions(pdev
, bars
, res_name
,
3197 IORESOURCE_EXCLUSIVE
);
3199 EXPORT_SYMBOL(pci_request_selected_regions_exclusive
);
3202 * pci_release_regions - Release reserved PCI I/O and memory resources
3203 * @pdev: PCI device whose resources were previously reserved by pci_request_regions
3205 * Releases all PCI I/O and memory resources previously reserved by a
3206 * successful call to pci_request_regions. Call this function only
3207 * after all use of the PCI regions has ceased.
3210 void pci_release_regions(struct pci_dev
*pdev
)
3212 pci_release_selected_regions(pdev
, (1 << 6) - 1);
3214 EXPORT_SYMBOL(pci_release_regions
);
3217 * pci_request_regions - Reserved PCI I/O and memory resources
3218 * @pdev: PCI device whose resources are to be reserved
3219 * @res_name: Name to be associated with resource.
3221 * Mark all PCI regions associated with PCI device @pdev as
3222 * being reserved by owner @res_name. Do not access any
3223 * address inside the PCI regions unless this call returns
3226 * Returns 0 on success, or %EBUSY on error. A warning
3227 * message is also printed on failure.
3229 int pci_request_regions(struct pci_dev
*pdev
, const char *res_name
)
3231 return pci_request_selected_regions(pdev
, ((1 << 6) - 1), res_name
);
3233 EXPORT_SYMBOL(pci_request_regions
);
3236 * pci_request_regions_exclusive - Reserved PCI I/O and memory resources
3237 * @pdev: PCI device whose resources are to be reserved
3238 * @res_name: Name to be associated with resource.
3240 * Mark all PCI regions associated with PCI device @pdev as
3241 * being reserved by owner @res_name. Do not access any
3242 * address inside the PCI regions unless this call returns
3245 * pci_request_regions_exclusive() will mark the region so that
3246 * /dev/mem and the sysfs MMIO access will not be allowed.
3248 * Returns 0 on success, or %EBUSY on error. A warning
3249 * message is also printed on failure.
3251 int pci_request_regions_exclusive(struct pci_dev
*pdev
, const char *res_name
)
3253 return pci_request_selected_regions_exclusive(pdev
,
3254 ((1 << 6) - 1), res_name
);
3256 EXPORT_SYMBOL(pci_request_regions_exclusive
);
3260 struct list_head list
;
3262 resource_size_t size
;
3265 static LIST_HEAD(io_range_list
);
3266 static DEFINE_SPINLOCK(io_range_lock
);
3270 * Record the PCI IO range (expressed as CPU physical address + size).
3271 * Return a negative value if an error has occured, zero otherwise
3273 int __weak
pci_register_io_range(phys_addr_t addr
, resource_size_t size
)
3278 struct io_range
*range
;
3279 resource_size_t allocated_size
= 0;
3281 /* check if the range hasn't been previously recorded */
3282 spin_lock(&io_range_lock
);
3283 list_for_each_entry(range
, &io_range_list
, list
) {
3284 if (addr
>= range
->start
&& addr
+ size
<= range
->start
+ size
) {
3285 /* range already registered, bail out */
3288 allocated_size
+= range
->size
;
3291 /* range not registed yet, check for available space */
3292 if (allocated_size
+ size
- 1 > IO_SPACE_LIMIT
) {
3293 /* if it's too big check if 64K space can be reserved */
3294 if (allocated_size
+ SZ_64K
- 1 > IO_SPACE_LIMIT
) {
3300 pr_warn("Requested IO range too big, new size set to 64K\n");
3303 /* add the range to the list */
3304 range
= kzalloc(sizeof(*range
), GFP_ATOMIC
);
3310 range
->start
= addr
;
3313 list_add_tail(&range
->list
, &io_range_list
);
3316 spin_unlock(&io_range_lock
);
3322 phys_addr_t
pci_pio_to_address(unsigned long pio
)
3324 phys_addr_t address
= (phys_addr_t
)OF_BAD_ADDR
;
3327 struct io_range
*range
;
3328 resource_size_t allocated_size
= 0;
3330 if (pio
> IO_SPACE_LIMIT
)
3333 spin_lock(&io_range_lock
);
3334 list_for_each_entry(range
, &io_range_list
, list
) {
3335 if (pio
>= allocated_size
&& pio
< allocated_size
+ range
->size
) {
3336 address
= range
->start
+ pio
- allocated_size
;
3339 allocated_size
+= range
->size
;
3341 spin_unlock(&io_range_lock
);
3347 unsigned long __weak
pci_address_to_pio(phys_addr_t address
)
3350 struct io_range
*res
;
3351 resource_size_t offset
= 0;
3352 unsigned long addr
= -1;
3354 spin_lock(&io_range_lock
);
3355 list_for_each_entry(res
, &io_range_list
, list
) {
3356 if (address
>= res
->start
&& address
< res
->start
+ res
->size
) {
3357 addr
= address
- res
->start
+ offset
;
3360 offset
+= res
->size
;
3362 spin_unlock(&io_range_lock
);
3366 if (address
> IO_SPACE_LIMIT
)
3367 return (unsigned long)-1;
3369 return (unsigned long) address
;
3374 * pci_remap_iospace - Remap the memory mapped I/O space
3375 * @res: Resource describing the I/O space
3376 * @phys_addr: physical address of range to be mapped
3378 * Remap the memory mapped I/O space described by the @res
3379 * and the CPU physical address @phys_addr into virtual address space.
3380 * Only architectures that have memory mapped IO functions defined
3381 * (and the PCI_IOBASE value defined) should call this function.
3383 int pci_remap_iospace(const struct resource
*res
, phys_addr_t phys_addr
)
3385 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3386 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3388 if (!(res
->flags
& IORESOURCE_IO
))
3391 if (res
->end
> IO_SPACE_LIMIT
)
3394 return ioremap_page_range(vaddr
, vaddr
+ resource_size(res
), phys_addr
,
3395 pgprot_device(PAGE_KERNEL
));
3397 /* this architecture does not have memory mapped I/O space,
3398 so this function should never be called */
3399 WARN_ONCE(1, "This architecture does not support memory mapped I/O\n");
3403 EXPORT_SYMBOL(pci_remap_iospace
);
3406 * pci_unmap_iospace - Unmap the memory mapped I/O space
3407 * @res: resource to be unmapped
3409 * Unmap the CPU virtual address @res from virtual address space.
3410 * Only architectures that have memory mapped IO functions defined
3411 * (and the PCI_IOBASE value defined) should call this function.
3413 void pci_unmap_iospace(struct resource
*res
)
3415 #if defined(PCI_IOBASE) && defined(CONFIG_MMU)
3416 unsigned long vaddr
= (unsigned long)PCI_IOBASE
+ res
->start
;
3418 unmap_kernel_range(vaddr
, resource_size(res
));
3421 EXPORT_SYMBOL(pci_unmap_iospace
);
3424 * devm_pci_remap_cfgspace - Managed pci_remap_cfgspace()
3425 * @dev: Generic device to remap IO address for
3426 * @offset: Resource address to map
3427 * @size: Size of map
3429 * Managed pci_remap_cfgspace(). Map is automatically unmapped on driver
3432 void __iomem
*devm_pci_remap_cfgspace(struct device
*dev
,
3433 resource_size_t offset
,
3434 resource_size_t size
)
3436 void __iomem
**ptr
, *addr
;
3438 ptr
= devres_alloc(devm_ioremap_release
, sizeof(*ptr
), GFP_KERNEL
);
3442 addr
= pci_remap_cfgspace(offset
, size
);
3445 devres_add(dev
, ptr
);
3451 EXPORT_SYMBOL(devm_pci_remap_cfgspace
);
3454 * devm_pci_remap_cfg_resource - check, request region and ioremap cfg resource
3455 * @dev: generic device to handle the resource for
3456 * @res: configuration space resource to be handled
3458 * Checks that a resource is a valid memory region, requests the memory
3459 * region and ioremaps with pci_remap_cfgspace() API that ensures the
3460 * proper PCI configuration space memory attributes are guaranteed.
3462 * All operations are managed and will be undone on driver detach.
3464 * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code
3465 * on failure. Usage example:
3467 * res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
3468 * base = devm_pci_remap_cfg_resource(&pdev->dev, res);
3470 * return PTR_ERR(base);
3472 void __iomem
*devm_pci_remap_cfg_resource(struct device
*dev
,
3473 struct resource
*res
)
3475 resource_size_t size
;
3477 void __iomem
*dest_ptr
;
3481 if (!res
|| resource_type(res
) != IORESOURCE_MEM
) {
3482 dev_err(dev
, "invalid resource\n");
3483 return IOMEM_ERR_PTR(-EINVAL
);
3486 size
= resource_size(res
);
3487 name
= res
->name
?: dev_name(dev
);
3489 if (!devm_request_mem_region(dev
, res
->start
, size
, name
)) {
3490 dev_err(dev
, "can't request region for resource %pR\n", res
);
3491 return IOMEM_ERR_PTR(-EBUSY
);
3494 dest_ptr
= devm_pci_remap_cfgspace(dev
, res
->start
, size
);
3496 dev_err(dev
, "ioremap failed for resource %pR\n", res
);
3497 devm_release_mem_region(dev
, res
->start
, size
);
3498 dest_ptr
= IOMEM_ERR_PTR(-ENOMEM
);
3503 EXPORT_SYMBOL(devm_pci_remap_cfg_resource
);
3505 static void __pci_set_master(struct pci_dev
*dev
, bool enable
)
3509 pci_read_config_word(dev
, PCI_COMMAND
, &old_cmd
);
3511 cmd
= old_cmd
| PCI_COMMAND_MASTER
;
3513 cmd
= old_cmd
& ~PCI_COMMAND_MASTER
;
3514 if (cmd
!= old_cmd
) {
3515 dev_dbg(&dev
->dev
, "%s bus mastering\n",
3516 enable
? "enabling" : "disabling");
3517 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3519 dev
->is_busmaster
= enable
;
3523 * pcibios_setup - process "pci=" kernel boot arguments
3524 * @str: string used to pass in "pci=" kernel boot arguments
3526 * Process kernel boot arguments. This is the default implementation.
3527 * Architecture specific implementations can override this as necessary.
3529 char * __weak __init
pcibios_setup(char *str
)
3535 * pcibios_set_master - enable PCI bus-mastering for device dev
3536 * @dev: the PCI device to enable
3538 * Enables PCI bus-mastering for the device. This is the default
3539 * implementation. Architecture specific implementations can override
3540 * this if necessary.
3542 void __weak
pcibios_set_master(struct pci_dev
*dev
)
3546 /* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
3547 if (pci_is_pcie(dev
))
3550 pci_read_config_byte(dev
, PCI_LATENCY_TIMER
, &lat
);
3552 lat
= (64 <= pcibios_max_latency
) ? 64 : pcibios_max_latency
;
3553 else if (lat
> pcibios_max_latency
)
3554 lat
= pcibios_max_latency
;
3558 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, lat
);
3562 * pci_set_master - enables bus-mastering for device dev
3563 * @dev: the PCI device to enable
3565 * Enables bus-mastering on the device and calls pcibios_set_master()
3566 * to do the needed arch specific settings.
3568 void pci_set_master(struct pci_dev
*dev
)
3570 __pci_set_master(dev
, true);
3571 pcibios_set_master(dev
);
3573 EXPORT_SYMBOL(pci_set_master
);
3576 * pci_clear_master - disables bus-mastering for device dev
3577 * @dev: the PCI device to disable
3579 void pci_clear_master(struct pci_dev
*dev
)
3581 __pci_set_master(dev
, false);
3583 EXPORT_SYMBOL(pci_clear_master
);
3586 * pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
3587 * @dev: the PCI device for which MWI is to be enabled
3589 * Helper function for pci_set_mwi.
3590 * Originally copied from drivers/net/acenic.c.
3591 * Copyright 1998-2001 by Jes Sorensen, <jes@trained-monkey.org>.
3593 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3595 int pci_set_cacheline_size(struct pci_dev
*dev
)
3599 if (!pci_cache_line_size
)
3602 /* Validate current setting: the PCI_CACHE_LINE_SIZE must be
3603 equal to or multiple of the right value. */
3604 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3605 if (cacheline_size
>= pci_cache_line_size
&&
3606 (cacheline_size
% pci_cache_line_size
) == 0)
3609 /* Write the correct value. */
3610 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, pci_cache_line_size
);
3612 pci_read_config_byte(dev
, PCI_CACHE_LINE_SIZE
, &cacheline_size
);
3613 if (cacheline_size
== pci_cache_line_size
)
3616 dev_printk(KERN_DEBUG
, &dev
->dev
, "cache line size of %d is not supported\n",
3617 pci_cache_line_size
<< 2);
3621 EXPORT_SYMBOL_GPL(pci_set_cacheline_size
);
3624 * pci_set_mwi - enables memory-write-invalidate PCI transaction
3625 * @dev: the PCI device for which MWI is enabled
3627 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3629 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3631 int pci_set_mwi(struct pci_dev
*dev
)
3633 #ifdef PCI_DISABLE_MWI
3639 rc
= pci_set_cacheline_size(dev
);
3643 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3644 if (!(cmd
& PCI_COMMAND_INVALIDATE
)) {
3645 dev_dbg(&dev
->dev
, "enabling Mem-Wr-Inval\n");
3646 cmd
|= PCI_COMMAND_INVALIDATE
;
3647 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3652 EXPORT_SYMBOL(pci_set_mwi
);
3655 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction
3656 * @dev: the PCI device for which MWI is enabled
3658 * Enables the Memory-Write-Invalidate transaction in %PCI_COMMAND.
3659 * Callers are not required to check the return value.
3661 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
3663 int pci_try_set_mwi(struct pci_dev
*dev
)
3665 #ifdef PCI_DISABLE_MWI
3668 return pci_set_mwi(dev
);
3671 EXPORT_SYMBOL(pci_try_set_mwi
);
3674 * pci_clear_mwi - disables Memory-Write-Invalidate for device dev
3675 * @dev: the PCI device to disable
3677 * Disables PCI Memory-Write-Invalidate transaction on the device
3679 void pci_clear_mwi(struct pci_dev
*dev
)
3681 #ifndef PCI_DISABLE_MWI
3684 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
3685 if (cmd
& PCI_COMMAND_INVALIDATE
) {
3686 cmd
&= ~PCI_COMMAND_INVALIDATE
;
3687 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
3691 EXPORT_SYMBOL(pci_clear_mwi
);
3694 * pci_intx - enables/disables PCI INTx for device dev
3695 * @pdev: the PCI device to operate on
3696 * @enable: boolean: whether to enable or disable PCI INTx
3698 * Enables/disables PCI INTx for device dev
3700 void pci_intx(struct pci_dev
*pdev
, int enable
)
3702 u16 pci_command
, new;
3704 pci_read_config_word(pdev
, PCI_COMMAND
, &pci_command
);
3707 new = pci_command
& ~PCI_COMMAND_INTX_DISABLE
;
3709 new = pci_command
| PCI_COMMAND_INTX_DISABLE
;
3711 if (new != pci_command
) {
3712 struct pci_devres
*dr
;
3714 pci_write_config_word(pdev
, PCI_COMMAND
, new);
3716 dr
= find_pci_dr(pdev
);
3717 if (dr
&& !dr
->restore_intx
) {
3718 dr
->restore_intx
= 1;
3719 dr
->orig_intx
= !enable
;
3723 EXPORT_SYMBOL_GPL(pci_intx
);
3725 static bool pci_check_and_set_intx_mask(struct pci_dev
*dev
, bool mask
)
3727 struct pci_bus
*bus
= dev
->bus
;
3728 bool mask_updated
= true;
3729 u32 cmd_status_dword
;
3730 u16 origcmd
, newcmd
;
3731 unsigned long flags
;
3735 * We do a single dword read to retrieve both command and status.
3736 * Document assumptions that make this possible.
3738 BUILD_BUG_ON(PCI_COMMAND
% 4);
3739 BUILD_BUG_ON(PCI_COMMAND
+ 2 != PCI_STATUS
);
3741 raw_spin_lock_irqsave(&pci_lock
, flags
);
3743 bus
->ops
->read(bus
, dev
->devfn
, PCI_COMMAND
, 4, &cmd_status_dword
);
3745 irq_pending
= (cmd_status_dword
>> 16) & PCI_STATUS_INTERRUPT
;
3748 * Check interrupt status register to see whether our device
3749 * triggered the interrupt (when masking) or the next IRQ is
3750 * already pending (when unmasking).
3752 if (mask
!= irq_pending
) {
3753 mask_updated
= false;
3757 origcmd
= cmd_status_dword
;
3758 newcmd
= origcmd
& ~PCI_COMMAND_INTX_DISABLE
;
3760 newcmd
|= PCI_COMMAND_INTX_DISABLE
;
3761 if (newcmd
!= origcmd
)
3762 bus
->ops
->write(bus
, dev
->devfn
, PCI_COMMAND
, 2, newcmd
);
3765 raw_spin_unlock_irqrestore(&pci_lock
, flags
);
3767 return mask_updated
;
3771 * pci_check_and_mask_intx - mask INTx on pending interrupt
3772 * @dev: the PCI device to operate on
3774 * Check if the device dev has its INTx line asserted, mask it and
3775 * return true in that case. False is returned if no interrupt was
3778 bool pci_check_and_mask_intx(struct pci_dev
*dev
)
3780 return pci_check_and_set_intx_mask(dev
, true);
3782 EXPORT_SYMBOL_GPL(pci_check_and_mask_intx
);
3785 * pci_check_and_unmask_intx - unmask INTx if no interrupt is pending
3786 * @dev: the PCI device to operate on
3788 * Check if the device dev has its INTx line asserted, unmask it if not
3789 * and return true. False is returned and the mask remains active if
3790 * there was still an interrupt pending.
3792 bool pci_check_and_unmask_intx(struct pci_dev
*dev
)
3794 return pci_check_and_set_intx_mask(dev
, false);
3796 EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx
);
3799 * pci_wait_for_pending_transaction - waits for pending transaction
3800 * @dev: the PCI device to operate on
3802 * Return 0 if transaction is pending 1 otherwise.
3804 int pci_wait_for_pending_transaction(struct pci_dev
*dev
)
3806 if (!pci_is_pcie(dev
))
3809 return pci_wait_for_pending(dev
, pci_pcie_cap(dev
) + PCI_EXP_DEVSTA
,
3810 PCI_EXP_DEVSTA_TRPND
);
3812 EXPORT_SYMBOL(pci_wait_for_pending_transaction
);
3815 * We should only need to wait 100ms after FLR, but some devices take longer.
3816 * Wait for up to 1000ms for config space to return something other than -1.
3817 * Intel IGD requires this when an LCD panel is attached. We read the 2nd
3818 * dword because VFs don't implement the 1st dword.
3820 static void pci_flr_wait(struct pci_dev
*dev
)
3827 pci_read_config_dword(dev
, PCI_COMMAND
, &id
);
3828 } while (i
++ < 10 && id
== ~0);
3831 dev_warn(&dev
->dev
, "Failed to return from FLR\n");
3833 dev_info(&dev
->dev
, "Required additional %dms to return from FLR\n",
3838 * pcie_has_flr - check if a device supports function level resets
3839 * @dev: device to check
3841 * Returns true if the device advertises support for PCIe function level
3844 static bool pcie_has_flr(struct pci_dev
*dev
)
3848 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_FLR_RESET
)
3851 pcie_capability_read_dword(dev
, PCI_EXP_DEVCAP
, &cap
);
3852 return cap
& PCI_EXP_DEVCAP_FLR
;
3856 * pcie_flr - initiate a PCIe function level reset
3857 * @dev: device to reset
3859 * Initiate a function level reset on @dev. The caller should ensure the
3860 * device supports FLR before calling this function, e.g. by using the
3861 * pcie_has_flr() helper.
3863 void pcie_flr(struct pci_dev
*dev
)
3865 if (!pci_wait_for_pending_transaction(dev
))
3866 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing function level reset anyway\n");
3868 pcie_capability_set_word(dev
, PCI_EXP_DEVCTL
, PCI_EXP_DEVCTL_BCR_FLR
);
3871 EXPORT_SYMBOL_GPL(pcie_flr
);
3873 static int pci_af_flr(struct pci_dev
*dev
, int probe
)
3878 pos
= pci_find_capability(dev
, PCI_CAP_ID_AF
);
3882 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_FLR_RESET
)
3885 pci_read_config_byte(dev
, pos
+ PCI_AF_CAP
, &cap
);
3886 if (!(cap
& PCI_AF_CAP_TP
) || !(cap
& PCI_AF_CAP_FLR
))
3893 * Wait for Transaction Pending bit to clear. A word-aligned test
3894 * is used, so we use the conrol offset rather than status and shift
3895 * the test bit to match.
3897 if (!pci_wait_for_pending(dev
, pos
+ PCI_AF_CTRL
,
3898 PCI_AF_STATUS_TP
<< 8))
3899 dev_err(&dev
->dev
, "timed out waiting for pending transaction; performing AF function level reset anyway\n");
3901 pci_write_config_byte(dev
, pos
+ PCI_AF_CTRL
, PCI_AF_CTRL_FLR
);
3907 * pci_pm_reset - Put device into PCI_D3 and back into PCI_D0.
3908 * @dev: Device to reset.
3909 * @probe: If set, only check if the device can be reset this way.
3911 * If @dev supports native PCI PM and its PCI_PM_CTRL_NO_SOFT_RESET flag is
3912 * unset, it will be reinitialized internally when going from PCI_D3hot to
3913 * PCI_D0. If that's the case and the device is not in a low-power state
3914 * already, force it into PCI_D3hot and back to PCI_D0, causing it to be reset.
3916 * NOTE: This causes the caller to sleep for twice the device power transition
3917 * cooldown period, which for the D0->D3hot and D3hot->D0 transitions is 10 ms
3918 * by default (i.e. unless the @dev's d3_delay field has a different value).
3919 * Moreover, only devices in D0 can be reset by this function.
3921 static int pci_pm_reset(struct pci_dev
*dev
, int probe
)
3925 if (!dev
->pm_cap
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_PM_RESET
)
3928 pci_read_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, &csr
);
3929 if (csr
& PCI_PM_CTRL_NO_SOFT_RESET
)
3935 if (dev
->current_state
!= PCI_D0
)
3938 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3940 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3941 pci_dev_d3_sleep(dev
);
3943 csr
&= ~PCI_PM_CTRL_STATE_MASK
;
3945 pci_write_config_word(dev
, dev
->pm_cap
+ PCI_PM_CTRL
, csr
);
3946 pci_dev_d3_sleep(dev
);
3951 void pci_reset_secondary_bus(struct pci_dev
*dev
)
3955 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &ctrl
);
3956 ctrl
|= PCI_BRIDGE_CTL_BUS_RESET
;
3957 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3959 * PCI spec v3.0 7.6.4.2 requires minimum Trst of 1ms. Double
3960 * this to 2ms to ensure that we meet the minimum requirement.
3964 ctrl
&= ~PCI_BRIDGE_CTL_BUS_RESET
;
3965 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, ctrl
);
3968 * Trhfa for conventional PCI is 2^25 clock cycles.
3969 * Assuming a minimum 33MHz clock this results in a 1s
3970 * delay before we can consider subordinate devices to
3971 * be re-initialized. PCIe has some ways to shorten this,
3972 * but we don't make use of them yet.
3977 void __weak
pcibios_reset_secondary_bus(struct pci_dev
*dev
)
3979 pci_reset_secondary_bus(dev
);
3983 * pci_reset_bridge_secondary_bus - Reset the secondary bus on a PCI bridge.
3984 * @dev: Bridge device
3986 * Use the bridge control register to assert reset on the secondary bus.
3987 * Devices on the secondary bus are left in power-on state.
3989 void pci_reset_bridge_secondary_bus(struct pci_dev
*dev
)
3991 pcibios_reset_secondary_bus(dev
);
3993 EXPORT_SYMBOL_GPL(pci_reset_bridge_secondary_bus
);
3995 static int pci_parent_bus_reset(struct pci_dev
*dev
, int probe
)
3997 struct pci_dev
*pdev
;
3999 if (pci_is_root_bus(dev
->bus
) || dev
->subordinate
||
4000 !dev
->bus
->self
|| dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
4003 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
4010 pci_reset_bridge_secondary_bus(dev
->bus
->self
);
4015 static int pci_reset_hotplug_slot(struct hotplug_slot
*hotplug
, int probe
)
4019 if (!hotplug
|| !try_module_get(hotplug
->ops
->owner
))
4022 if (hotplug
->ops
->reset_slot
)
4023 rc
= hotplug
->ops
->reset_slot(hotplug
, probe
);
4025 module_put(hotplug
->ops
->owner
);
4030 static int pci_dev_reset_slot_function(struct pci_dev
*dev
, int probe
)
4032 struct pci_dev
*pdev
;
4034 if (dev
->subordinate
|| !dev
->slot
||
4035 dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
)
4038 list_for_each_entry(pdev
, &dev
->bus
->devices
, bus_list
)
4039 if (pdev
!= dev
&& pdev
->slot
== dev
->slot
)
4042 return pci_reset_hotplug_slot(dev
->slot
->hotplug
, probe
);
4045 static void pci_dev_lock(struct pci_dev
*dev
)
4047 pci_cfg_access_lock(dev
);
4048 /* block PM suspend, driver probe, etc. */
4049 device_lock(&dev
->dev
);
4052 /* Return 1 on successful lock, 0 on contention */
4053 static int pci_dev_trylock(struct pci_dev
*dev
)
4055 if (pci_cfg_access_trylock(dev
)) {
4056 if (device_trylock(&dev
->dev
))
4058 pci_cfg_access_unlock(dev
);
4064 static void pci_dev_unlock(struct pci_dev
*dev
)
4066 device_unlock(&dev
->dev
);
4067 pci_cfg_access_unlock(dev
);
4070 static void pci_dev_save_and_disable(struct pci_dev
*dev
)
4072 const struct pci_error_handlers
*err_handler
=
4073 dev
->driver
? dev
->driver
->err_handler
: NULL
;
4076 * dev->driver->err_handler->reset_prepare() is protected against
4077 * races with ->remove() by the device lock, which must be held by
4080 if (err_handler
&& err_handler
->reset_prepare
)
4081 err_handler
->reset_prepare(dev
);
4084 * Wake-up device prior to save. PM registers default to D0 after
4085 * reset and a simple register restore doesn't reliably return
4086 * to a non-D0 state anyway.
4088 pci_set_power_state(dev
, PCI_D0
);
4090 pci_save_state(dev
);
4092 * Disable the device by clearing the Command register, except for
4093 * INTx-disable which is set. This not only disables MMIO and I/O port
4094 * BARs, but also prevents the device from being Bus Master, preventing
4095 * DMA from the device including MSI/MSI-X interrupts. For PCI 2.3
4096 * compliant devices, INTx-disable prevents legacy interrupts.
4098 pci_write_config_word(dev
, PCI_COMMAND
, PCI_COMMAND_INTX_DISABLE
);
4101 static void pci_dev_restore(struct pci_dev
*dev
)
4103 const struct pci_error_handlers
*err_handler
=
4104 dev
->driver
? dev
->driver
->err_handler
: NULL
;
4106 pci_restore_state(dev
);
4109 * dev->driver->err_handler->reset_done() is protected against
4110 * races with ->remove() by the device lock, which must be held by
4113 if (err_handler
&& err_handler
->reset_done
)
4114 err_handler
->reset_done(dev
);
4118 * __pci_reset_function - reset a PCI device function
4119 * @dev: PCI device to reset
4121 * Some devices allow an individual function to be reset without affecting
4122 * other functions in the same device. The PCI device must be responsive
4123 * to PCI config space in order to use this function.
4125 * The device function is presumed to be unused when this function is called.
4126 * Resetting the device will make the contents of PCI configuration space
4127 * random, so any caller of this must be prepared to reinitialise the
4128 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
4131 * Returns 0 if the device function was successfully reset or negative if the
4132 * device doesn't support resetting a single function.
4134 int __pci_reset_function(struct pci_dev
*dev
)
4139 ret
= __pci_reset_function_locked(dev
);
4140 pci_dev_unlock(dev
);
4144 EXPORT_SYMBOL_GPL(__pci_reset_function
);
4147 * __pci_reset_function_locked - reset a PCI device function while holding
4148 * the @dev mutex lock.
4149 * @dev: PCI device to reset
4151 * Some devices allow an individual function to be reset without affecting
4152 * other functions in the same device. The PCI device must be responsive
4153 * to PCI config space in order to use this function.
4155 * The device function is presumed to be unused and the caller is holding
4156 * the device mutex lock when this function is called.
4157 * Resetting the device will make the contents of PCI configuration space
4158 * random, so any caller of this must be prepared to reinitialise the
4159 * device including MSI, bus mastering, BARs, decoding IO and memory spaces,
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_locked(struct pci_dev
*dev
)
4171 rc
= pci_dev_specific_reset(dev
, 0);
4174 if (pcie_has_flr(dev
)) {
4178 rc
= pci_af_flr(dev
, 0);
4181 rc
= pci_pm_reset(dev
, 0);
4184 rc
= pci_dev_reset_slot_function(dev
, 0);
4187 return pci_parent_bus_reset(dev
, 0);
4189 EXPORT_SYMBOL_GPL(__pci_reset_function_locked
);
4192 * pci_probe_reset_function - check whether the device can be safely reset
4193 * @dev: PCI device to reset
4195 * Some devices allow an individual function to be reset without affecting
4196 * other functions in the same device. The PCI device must be responsive
4197 * to PCI config space in order to use this function.
4199 * Returns 0 if the device function can be reset or negative if the
4200 * device doesn't support resetting a single function.
4202 int pci_probe_reset_function(struct pci_dev
*dev
)
4208 rc
= pci_dev_specific_reset(dev
, 1);
4211 if (pcie_has_flr(dev
))
4213 rc
= pci_af_flr(dev
, 1);
4216 rc
= pci_pm_reset(dev
, 1);
4219 rc
= pci_dev_reset_slot_function(dev
, 1);
4223 return pci_parent_bus_reset(dev
, 1);
4227 * pci_reset_function - quiesce and reset a PCI device function
4228 * @dev: PCI device to reset
4230 * Some devices allow an individual function to be reset without affecting
4231 * other functions in the same device. The PCI device must be responsive
4232 * to PCI config space in order to use this function.
4234 * This function does not just reset the PCI portion of a device, but
4235 * clears all the state associated with the device. This function differs
4236 * from __pci_reset_function in that it saves and restores device state
4239 * Returns 0 if the device function was successfully reset or negative if the
4240 * device doesn't support resetting a single function.
4242 int pci_reset_function(struct pci_dev
*dev
)
4246 rc
= pci_probe_reset_function(dev
);
4251 pci_dev_save_and_disable(dev
);
4253 rc
= __pci_reset_function_locked(dev
);
4255 pci_dev_restore(dev
);
4256 pci_dev_unlock(dev
);
4260 EXPORT_SYMBOL_GPL(pci_reset_function
);
4263 * pci_reset_function_locked - quiesce and reset a PCI device function
4264 * @dev: PCI device to reset
4266 * Some devices allow an individual function to be reset without affecting
4267 * other functions in the same device. The PCI device must be responsive
4268 * to PCI config space in order to use this function.
4270 * This function does not just reset the PCI portion of a device, but
4271 * clears all the state associated with the device. This function differs
4272 * from __pci_reset_function() in that it saves and restores device state
4273 * over the reset. It also differs from pci_reset_function() in that it
4274 * requires the PCI device lock to be held.
4276 * Returns 0 if the device function was successfully reset or negative if the
4277 * device doesn't support resetting a single function.
4279 int pci_reset_function_locked(struct pci_dev
*dev
)
4283 rc
= pci_probe_reset_function(dev
);
4287 pci_dev_save_and_disable(dev
);
4289 rc
= __pci_reset_function_locked(dev
);
4291 pci_dev_restore(dev
);
4295 EXPORT_SYMBOL_GPL(pci_reset_function_locked
);
4298 * pci_try_reset_function - quiesce and reset a PCI device function
4299 * @dev: PCI device to reset
4301 * Same as above, except return -EAGAIN if unable to lock device.
4303 int pci_try_reset_function(struct pci_dev
*dev
)
4307 rc
= pci_probe_reset_function(dev
);
4311 if (!pci_dev_trylock(dev
))
4314 pci_dev_save_and_disable(dev
);
4315 rc
= __pci_reset_function_locked(dev
);
4316 pci_dev_unlock(dev
);
4318 pci_dev_restore(dev
);
4321 EXPORT_SYMBOL_GPL(pci_try_reset_function
);
4323 /* Do any devices on or below this bus prevent a bus reset? */
4324 static bool pci_bus_resetable(struct pci_bus
*bus
)
4326 struct pci_dev
*dev
;
4328 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4329 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4330 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4337 /* Lock devices from the top of the tree down */
4338 static void pci_bus_lock(struct pci_bus
*bus
)
4340 struct pci_dev
*dev
;
4342 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4344 if (dev
->subordinate
)
4345 pci_bus_lock(dev
->subordinate
);
4349 /* Unlock devices from the bottom of the tree up */
4350 static void pci_bus_unlock(struct pci_bus
*bus
)
4352 struct pci_dev
*dev
;
4354 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4355 if (dev
->subordinate
)
4356 pci_bus_unlock(dev
->subordinate
);
4357 pci_dev_unlock(dev
);
4361 /* Return 1 on successful lock, 0 on contention */
4362 static int pci_bus_trylock(struct pci_bus
*bus
)
4364 struct pci_dev
*dev
;
4366 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4367 if (!pci_dev_trylock(dev
))
4369 if (dev
->subordinate
) {
4370 if (!pci_bus_trylock(dev
->subordinate
)) {
4371 pci_dev_unlock(dev
);
4379 list_for_each_entry_continue_reverse(dev
, &bus
->devices
, bus_list
) {
4380 if (dev
->subordinate
)
4381 pci_bus_unlock(dev
->subordinate
);
4382 pci_dev_unlock(dev
);
4387 /* Do any devices on or below this slot prevent a bus reset? */
4388 static bool pci_slot_resetable(struct pci_slot
*slot
)
4390 struct pci_dev
*dev
;
4392 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4393 if (!dev
->slot
|| dev
->slot
!= slot
)
4395 if (dev
->dev_flags
& PCI_DEV_FLAGS_NO_BUS_RESET
||
4396 (dev
->subordinate
&& !pci_bus_resetable(dev
->subordinate
)))
4403 /* Lock devices from the top of the tree down */
4404 static void pci_slot_lock(struct pci_slot
*slot
)
4406 struct pci_dev
*dev
;
4408 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4409 if (!dev
->slot
|| dev
->slot
!= slot
)
4412 if (dev
->subordinate
)
4413 pci_bus_lock(dev
->subordinate
);
4417 /* Unlock devices from the bottom of the tree up */
4418 static void pci_slot_unlock(struct pci_slot
*slot
)
4420 struct pci_dev
*dev
;
4422 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4423 if (!dev
->slot
|| dev
->slot
!= slot
)
4425 if (dev
->subordinate
)
4426 pci_bus_unlock(dev
->subordinate
);
4427 pci_dev_unlock(dev
);
4431 /* Return 1 on successful lock, 0 on contention */
4432 static int pci_slot_trylock(struct pci_slot
*slot
)
4434 struct pci_dev
*dev
;
4436 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4437 if (!dev
->slot
|| dev
->slot
!= slot
)
4439 if (!pci_dev_trylock(dev
))
4441 if (dev
->subordinate
) {
4442 if (!pci_bus_trylock(dev
->subordinate
)) {
4443 pci_dev_unlock(dev
);
4451 list_for_each_entry_continue_reverse(dev
,
4452 &slot
->bus
->devices
, bus_list
) {
4453 if (!dev
->slot
|| dev
->slot
!= slot
)
4455 if (dev
->subordinate
)
4456 pci_bus_unlock(dev
->subordinate
);
4457 pci_dev_unlock(dev
);
4462 /* Save and disable devices from the top of the tree down */
4463 static void pci_bus_save_and_disable(struct pci_bus
*bus
)
4465 struct pci_dev
*dev
;
4467 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4469 pci_dev_save_and_disable(dev
);
4470 pci_dev_unlock(dev
);
4471 if (dev
->subordinate
)
4472 pci_bus_save_and_disable(dev
->subordinate
);
4477 * Restore devices from top of the tree down - parent bridges need to be
4478 * restored before we can get to subordinate devices.
4480 static void pci_bus_restore(struct pci_bus
*bus
)
4482 struct pci_dev
*dev
;
4484 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
4486 pci_dev_restore(dev
);
4487 pci_dev_unlock(dev
);
4488 if (dev
->subordinate
)
4489 pci_bus_restore(dev
->subordinate
);
4493 /* Save and disable devices from the top of the tree down */
4494 static void pci_slot_save_and_disable(struct pci_slot
*slot
)
4496 struct pci_dev
*dev
;
4498 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4499 if (!dev
->slot
|| dev
->slot
!= slot
)
4501 pci_dev_save_and_disable(dev
);
4502 if (dev
->subordinate
)
4503 pci_bus_save_and_disable(dev
->subordinate
);
4508 * Restore devices from top of the tree down - parent bridges need to be
4509 * restored before we can get to subordinate devices.
4511 static void pci_slot_restore(struct pci_slot
*slot
)
4513 struct pci_dev
*dev
;
4515 list_for_each_entry(dev
, &slot
->bus
->devices
, bus_list
) {
4516 if (!dev
->slot
|| dev
->slot
!= slot
)
4518 pci_dev_restore(dev
);
4519 if (dev
->subordinate
)
4520 pci_bus_restore(dev
->subordinate
);
4524 static int pci_slot_reset(struct pci_slot
*slot
, int probe
)
4528 if (!slot
|| !pci_slot_resetable(slot
))
4532 pci_slot_lock(slot
);
4536 rc
= pci_reset_hotplug_slot(slot
->hotplug
, probe
);
4539 pci_slot_unlock(slot
);
4545 * pci_probe_reset_slot - probe whether a PCI slot can be reset
4546 * @slot: PCI slot to probe
4548 * Return 0 if slot can be reset, negative if a slot reset is not supported.
4550 int pci_probe_reset_slot(struct pci_slot
*slot
)
4552 return pci_slot_reset(slot
, 1);
4554 EXPORT_SYMBOL_GPL(pci_probe_reset_slot
);
4557 * pci_reset_slot - reset a PCI slot
4558 * @slot: PCI slot to reset
4560 * A PCI bus may host multiple slots, each slot may support a reset mechanism
4561 * independent of other slots. For instance, some slots may support slot power
4562 * control. In the case of a 1:1 bus to slot architecture, this function may
4563 * wrap the bus reset to avoid spurious slot related events such as hotplug.
4564 * Generally a slot reset should be attempted before a bus reset. All of the
4565 * function of the slot and any subordinate buses behind the slot are reset
4566 * through this function. PCI config space of all devices in the slot and
4567 * behind the slot is saved before and restored after reset.
4569 * Return 0 on success, non-zero on error.
4571 int pci_reset_slot(struct pci_slot
*slot
)
4575 rc
= pci_slot_reset(slot
, 1);
4579 pci_slot_save_and_disable(slot
);
4581 rc
= pci_slot_reset(slot
, 0);
4583 pci_slot_restore(slot
);
4587 EXPORT_SYMBOL_GPL(pci_reset_slot
);
4590 * pci_try_reset_slot - Try to reset a PCI slot
4591 * @slot: PCI slot to reset
4593 * Same as above except return -EAGAIN if the slot cannot be locked
4595 int pci_try_reset_slot(struct pci_slot
*slot
)
4599 rc
= pci_slot_reset(slot
, 1);
4603 pci_slot_save_and_disable(slot
);
4605 if (pci_slot_trylock(slot
)) {
4607 rc
= pci_reset_hotplug_slot(slot
->hotplug
, 0);
4608 pci_slot_unlock(slot
);
4612 pci_slot_restore(slot
);
4616 EXPORT_SYMBOL_GPL(pci_try_reset_slot
);
4618 static int pci_bus_reset(struct pci_bus
*bus
, int probe
)
4620 if (!bus
->self
|| !pci_bus_resetable(bus
))
4630 pci_reset_bridge_secondary_bus(bus
->self
);
4632 pci_bus_unlock(bus
);
4638 * pci_probe_reset_bus - probe whether a PCI bus can be reset
4639 * @bus: PCI bus to probe
4641 * Return 0 if bus can be reset, negative if a bus reset is not supported.
4643 int pci_probe_reset_bus(struct pci_bus
*bus
)
4645 return pci_bus_reset(bus
, 1);
4647 EXPORT_SYMBOL_GPL(pci_probe_reset_bus
);
4650 * pci_reset_bus - reset a PCI bus
4651 * @bus: top level PCI bus to reset
4653 * Do a bus reset on the given bus and any subordinate buses, saving
4654 * and restoring state of all devices.
4656 * Return 0 on success, non-zero on error.
4658 int pci_reset_bus(struct pci_bus
*bus
)
4662 rc
= pci_bus_reset(bus
, 1);
4666 pci_bus_save_and_disable(bus
);
4668 rc
= pci_bus_reset(bus
, 0);
4670 pci_bus_restore(bus
);
4674 EXPORT_SYMBOL_GPL(pci_reset_bus
);
4677 * pci_try_reset_bus - Try to reset a PCI bus
4678 * @bus: top level PCI bus to reset
4680 * Same as above except return -EAGAIN if the bus cannot be locked
4682 int pci_try_reset_bus(struct pci_bus
*bus
)
4686 rc
= pci_bus_reset(bus
, 1);
4690 pci_bus_save_and_disable(bus
);
4692 if (pci_bus_trylock(bus
)) {
4694 pci_reset_bridge_secondary_bus(bus
->self
);
4695 pci_bus_unlock(bus
);
4699 pci_bus_restore(bus
);
4703 EXPORT_SYMBOL_GPL(pci_try_reset_bus
);
4706 * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count
4707 * @dev: PCI device to query
4709 * Returns mmrbc: maximum designed memory read count in bytes
4710 * or appropriate error value.
4712 int pcix_get_max_mmrbc(struct pci_dev
*dev
)
4717 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4721 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4724 return 512 << ((stat
& PCI_X_STATUS_MAX_READ
) >> 21);
4726 EXPORT_SYMBOL(pcix_get_max_mmrbc
);
4729 * pcix_get_mmrbc - get PCI-X maximum memory read byte count
4730 * @dev: PCI device to query
4732 * Returns mmrbc: maximum memory read count in bytes
4733 * or appropriate error value.
4735 int pcix_get_mmrbc(struct pci_dev
*dev
)
4740 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4744 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4747 return 512 << ((cmd
& PCI_X_CMD_MAX_READ
) >> 2);
4749 EXPORT_SYMBOL(pcix_get_mmrbc
);
4752 * pcix_set_mmrbc - set PCI-X maximum memory read byte count
4753 * @dev: PCI device to query
4754 * @mmrbc: maximum memory read count in bytes
4755 * valid values are 512, 1024, 2048, 4096
4757 * If possible sets maximum memory read byte count, some bridges have erratas
4758 * that prevent this.
4760 int pcix_set_mmrbc(struct pci_dev
*dev
, int mmrbc
)
4766 if (mmrbc
< 512 || mmrbc
> 4096 || !is_power_of_2(mmrbc
))
4769 v
= ffs(mmrbc
) - 10;
4771 cap
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
4775 if (pci_read_config_dword(dev
, cap
+ PCI_X_STATUS
, &stat
))
4778 if (v
> (stat
& PCI_X_STATUS_MAX_READ
) >> 21)
4781 if (pci_read_config_word(dev
, cap
+ PCI_X_CMD
, &cmd
))
4784 o
= (cmd
& PCI_X_CMD_MAX_READ
) >> 2;
4786 if (v
> o
&& (dev
->bus
->bus_flags
& PCI_BUS_FLAGS_NO_MMRBC
))
4789 cmd
&= ~PCI_X_CMD_MAX_READ
;
4791 if (pci_write_config_word(dev
, cap
+ PCI_X_CMD
, cmd
))
4796 EXPORT_SYMBOL(pcix_set_mmrbc
);
4799 * pcie_get_readrq - get PCI Express read request size
4800 * @dev: PCI device to query
4802 * Returns maximum memory read request in bytes
4803 * or appropriate error value.
4805 int pcie_get_readrq(struct pci_dev
*dev
)
4809 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4811 return 128 << ((ctl
& PCI_EXP_DEVCTL_READRQ
) >> 12);
4813 EXPORT_SYMBOL(pcie_get_readrq
);
4816 * pcie_set_readrq - set PCI Express maximum memory read request
4817 * @dev: PCI device to query
4818 * @rq: maximum memory read count in bytes
4819 * valid values are 128, 256, 512, 1024, 2048, 4096
4821 * If possible sets maximum memory read request in bytes
4823 int pcie_set_readrq(struct pci_dev
*dev
, int rq
)
4827 if (rq
< 128 || rq
> 4096 || !is_power_of_2(rq
))
4831 * If using the "performance" PCIe config, we clamp the
4832 * read rq size to the max packet size to prevent the
4833 * host bridge generating requests larger than we can
4836 if (pcie_bus_config
== PCIE_BUS_PERFORMANCE
) {
4837 int mps
= pcie_get_mps(dev
);
4843 v
= (ffs(rq
) - 8) << 12;
4845 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4846 PCI_EXP_DEVCTL_READRQ
, v
);
4848 EXPORT_SYMBOL(pcie_set_readrq
);
4851 * pcie_get_mps - get PCI Express maximum payload size
4852 * @dev: PCI device to query
4854 * Returns maximum payload size in bytes
4856 int pcie_get_mps(struct pci_dev
*dev
)
4860 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
4862 return 128 << ((ctl
& PCI_EXP_DEVCTL_PAYLOAD
) >> 5);
4864 EXPORT_SYMBOL(pcie_get_mps
);
4867 * pcie_set_mps - set PCI Express maximum payload size
4868 * @dev: PCI device to query
4869 * @mps: maximum payload size in bytes
4870 * valid values are 128, 256, 512, 1024, 2048, 4096
4872 * If possible sets maximum payload size
4874 int pcie_set_mps(struct pci_dev
*dev
, int mps
)
4878 if (mps
< 128 || mps
> 4096 || !is_power_of_2(mps
))
4882 if (v
> dev
->pcie_mpss
)
4886 return pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
4887 PCI_EXP_DEVCTL_PAYLOAD
, v
);
4889 EXPORT_SYMBOL(pcie_set_mps
);
4892 * pcie_get_minimum_link - determine minimum link settings of a PCI device
4893 * @dev: PCI device to query
4894 * @speed: storage for minimum speed
4895 * @width: storage for minimum width
4897 * This function will walk up the PCI device chain and determine the minimum
4898 * link width and speed of the device.
4900 int pcie_get_minimum_link(struct pci_dev
*dev
, enum pci_bus_speed
*speed
,
4901 enum pcie_link_width
*width
)
4905 *speed
= PCI_SPEED_UNKNOWN
;
4906 *width
= PCIE_LNK_WIDTH_UNKNOWN
;
4910 enum pci_bus_speed next_speed
;
4911 enum pcie_link_width next_width
;
4913 ret
= pcie_capability_read_word(dev
, PCI_EXP_LNKSTA
, &lnksta
);
4917 next_speed
= pcie_link_speed
[lnksta
& PCI_EXP_LNKSTA_CLS
];
4918 next_width
= (lnksta
& PCI_EXP_LNKSTA_NLW
) >>
4919 PCI_EXP_LNKSTA_NLW_SHIFT
;
4921 if (next_speed
< *speed
)
4922 *speed
= next_speed
;
4924 if (next_width
< *width
)
4925 *width
= next_width
;
4927 dev
= dev
->bus
->self
;
4932 EXPORT_SYMBOL(pcie_get_minimum_link
);
4935 * pci_select_bars - Make BAR mask from the type of resource
4936 * @dev: the PCI device for which BAR mask is made
4937 * @flags: resource type mask to be selected
4939 * This helper routine makes bar mask from the type of resource.
4941 int pci_select_bars(struct pci_dev
*dev
, unsigned long flags
)
4944 for (i
= 0; i
< PCI_NUM_RESOURCES
; i
++)
4945 if (pci_resource_flags(dev
, i
) & flags
)
4949 EXPORT_SYMBOL(pci_select_bars
);
4951 /* Some architectures require additional programming to enable VGA */
4952 static arch_set_vga_state_t arch_set_vga_state
;
4954 void __init
pci_register_set_vga_state(arch_set_vga_state_t func
)
4956 arch_set_vga_state
= func
; /* NULL disables */
4959 static int pci_set_vga_state_arch(struct pci_dev
*dev
, bool decode
,
4960 unsigned int command_bits
, u32 flags
)
4962 if (arch_set_vga_state
)
4963 return arch_set_vga_state(dev
, decode
, command_bits
,
4969 * pci_set_vga_state - set VGA decode state on device and parents if requested
4970 * @dev: the PCI device
4971 * @decode: true = enable decoding, false = disable decoding
4972 * @command_bits: PCI_COMMAND_IO and/or PCI_COMMAND_MEMORY
4973 * @flags: traverse ancestors and change bridges
4974 * CHANGE_BRIDGE_ONLY / CHANGE_BRIDGE
4976 int pci_set_vga_state(struct pci_dev
*dev
, bool decode
,
4977 unsigned int command_bits
, u32 flags
)
4979 struct pci_bus
*bus
;
4980 struct pci_dev
*bridge
;
4984 WARN_ON((flags
& PCI_VGA_STATE_CHANGE_DECODES
) && (command_bits
& ~(PCI_COMMAND_IO
|PCI_COMMAND_MEMORY
)));
4986 /* ARCH specific VGA enables */
4987 rc
= pci_set_vga_state_arch(dev
, decode
, command_bits
, flags
);
4991 if (flags
& PCI_VGA_STATE_CHANGE_DECODES
) {
4992 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
4994 cmd
|= command_bits
;
4996 cmd
&= ~command_bits
;
4997 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
5000 if (!(flags
& PCI_VGA_STATE_CHANGE_BRIDGE
))
5007 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
5010 cmd
|= PCI_BRIDGE_CTL_VGA
;
5012 cmd
&= ~PCI_BRIDGE_CTL_VGA
;
5013 pci_write_config_word(bridge
, PCI_BRIDGE_CONTROL
,
5022 * pci_add_dma_alias - Add a DMA devfn alias for a device
5023 * @dev: the PCI device for which alias is added
5024 * @devfn: alias slot and function
5026 * This helper encodes 8-bit devfn as bit number in dma_alias_mask.
5027 * It should be called early, preferably as PCI fixup header quirk.
5029 void pci_add_dma_alias(struct pci_dev
*dev
, u8 devfn
)
5031 if (!dev
->dma_alias_mask
)
5032 dev
->dma_alias_mask
= kcalloc(BITS_TO_LONGS(U8_MAX
),
5033 sizeof(long), GFP_KERNEL
);
5034 if (!dev
->dma_alias_mask
) {
5035 dev_warn(&dev
->dev
, "Unable to allocate DMA alias mask\n");
5039 set_bit(devfn
, dev
->dma_alias_mask
);
5040 dev_info(&dev
->dev
, "Enabling fixed DMA alias to %02x.%d\n",
5041 PCI_SLOT(devfn
), PCI_FUNC(devfn
));
5044 bool pci_devs_are_dma_aliases(struct pci_dev
*dev1
, struct pci_dev
*dev2
)
5046 return (dev1
->dma_alias_mask
&&
5047 test_bit(dev2
->devfn
, dev1
->dma_alias_mask
)) ||
5048 (dev2
->dma_alias_mask
&&
5049 test_bit(dev1
->devfn
, dev2
->dma_alias_mask
));
5052 bool pci_device_is_present(struct pci_dev
*pdev
)
5056 if (pci_dev_is_disconnected(pdev
))
5058 return pci_bus_read_dev_vendor_id(pdev
->bus
, pdev
->devfn
, &v
, 0);
5060 EXPORT_SYMBOL_GPL(pci_device_is_present
);
5062 void pci_ignore_hotplug(struct pci_dev
*dev
)
5064 struct pci_dev
*bridge
= dev
->bus
->self
;
5066 dev
->ignore_hotplug
= 1;
5067 /* Propagate the "ignore hotplug" setting to the parent bridge. */
5069 bridge
->ignore_hotplug
= 1;
5071 EXPORT_SYMBOL_GPL(pci_ignore_hotplug
);
5073 resource_size_t __weak
pcibios_default_alignment(void)
5078 #define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
5079 static char resource_alignment_param
[RESOURCE_ALIGNMENT_PARAM_SIZE
] = {0};
5080 static DEFINE_SPINLOCK(resource_alignment_lock
);
5083 * pci_specified_resource_alignment - get resource alignment specified by user.
5084 * @dev: the PCI device to get
5085 * @resize: whether or not to change resources' size when reassigning alignment
5087 * RETURNS: Resource alignment if it is specified.
5088 * Zero if it is not specified.
5090 static resource_size_t
pci_specified_resource_alignment(struct pci_dev
*dev
,
5093 int seg
, bus
, slot
, func
, align_order
, count
;
5094 unsigned short vendor
, device
, subsystem_vendor
, subsystem_device
;
5095 resource_size_t align
= pcibios_default_alignment();
5098 spin_lock(&resource_alignment_lock
);
5099 p
= resource_alignment_param
;
5102 if (pci_has_flag(PCI_PROBE_ONLY
)) {
5104 pr_info_once("PCI: Ignoring requested alignments (PCI_PROBE_ONLY)\n");
5110 if (sscanf(p
, "%d%n", &align_order
, &count
) == 1 &&
5116 if (strncmp(p
, "pci:", 4) == 0) {
5117 /* PCI vendor/device (subvendor/subdevice) ids are specified */
5119 if (sscanf(p
, "%hx:%hx:%hx:%hx%n",
5120 &vendor
, &device
, &subsystem_vendor
, &subsystem_device
, &count
) != 4) {
5121 if (sscanf(p
, "%hx:%hx%n", &vendor
, &device
, &count
) != 2) {
5122 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: pci:%s\n",
5126 subsystem_vendor
= subsystem_device
= 0;
5129 if ((!vendor
|| (vendor
== dev
->vendor
)) &&
5130 (!device
|| (device
== dev
->device
)) &&
5131 (!subsystem_vendor
|| (subsystem_vendor
== dev
->subsystem_vendor
)) &&
5132 (!subsystem_device
|| (subsystem_device
== dev
->subsystem_device
))) {
5134 if (align_order
== -1)
5137 align
= 1 << align_order
;
5143 if (sscanf(p
, "%x:%x:%x.%x%n",
5144 &seg
, &bus
, &slot
, &func
, &count
) != 4) {
5146 if (sscanf(p
, "%x:%x.%x%n",
5147 &bus
, &slot
, &func
, &count
) != 3) {
5148 /* Invalid format */
5149 printk(KERN_ERR
"PCI: Can't parse resource_alignment parameter: %s\n",
5155 if (seg
== pci_domain_nr(dev
->bus
) &&
5156 bus
== dev
->bus
->number
&&
5157 slot
== PCI_SLOT(dev
->devfn
) &&
5158 func
== PCI_FUNC(dev
->devfn
)) {
5160 if (align_order
== -1)
5163 align
= 1 << align_order
;
5168 if (*p
!= ';' && *p
!= ',') {
5169 /* End of param or invalid format */
5175 spin_unlock(&resource_alignment_lock
);
5179 static void pci_request_resource_alignment(struct pci_dev
*dev
, int bar
,
5180 resource_size_t align
, bool resize
)
5182 struct resource
*r
= &dev
->resource
[bar
];
5183 resource_size_t size
;
5185 if (!(r
->flags
& IORESOURCE_MEM
))
5188 if (r
->flags
& IORESOURCE_PCI_FIXED
) {
5189 dev_info(&dev
->dev
, "BAR%d %pR: ignoring requested alignment %#llx\n",
5190 bar
, r
, (unsigned long long)align
);
5194 size
= resource_size(r
);
5199 * Increase the alignment of the resource. There are two ways we
5202 * 1) Increase the size of the resource. BARs are aligned on their
5203 * size, so when we reallocate space for this resource, we'll
5204 * allocate it with the larger alignment. This also prevents
5205 * assignment of any other BARs inside the alignment region, so
5206 * if we're requesting page alignment, this means no other BARs
5207 * will share the page.
5209 * The disadvantage is that this makes the resource larger than
5210 * the hardware BAR, which may break drivers that compute things
5211 * based on the resource size, e.g., to find registers at a
5212 * fixed offset before the end of the BAR.
5214 * 2) Retain the resource size, but use IORESOURCE_STARTALIGN and
5215 * set r->start to the desired alignment. By itself this
5216 * doesn't prevent other BARs being put inside the alignment
5217 * region, but if we realign *every* resource of every device in
5218 * the system, none of them will share an alignment region.
5220 * When the user has requested alignment for only some devices via
5221 * the "pci=resource_alignment" argument, "resize" is true and we
5222 * use the first method. Otherwise we assume we're aligning all
5223 * devices and we use the second.
5226 dev_info(&dev
->dev
, "BAR%d %pR: requesting alignment to %#llx\n",
5227 bar
, r
, (unsigned long long)align
);
5233 r
->flags
&= ~IORESOURCE_SIZEALIGN
;
5234 r
->flags
|= IORESOURCE_STARTALIGN
;
5236 r
->end
= r
->start
+ size
- 1;
5238 r
->flags
|= IORESOURCE_UNSET
;
5242 * This function disables memory decoding and releases memory resources
5243 * of the device specified by kernel's boot parameter 'pci=resource_alignment='.
5244 * It also rounds up size to specified alignment.
5245 * Later on, the kernel will assign page-aligned memory resource back
5248 void pci_reassigndev_resource_alignment(struct pci_dev
*dev
)
5252 resource_size_t align
;
5254 bool resize
= false;
5257 * VF BARs are read-only zero according to SR-IOV spec r1.1, sec
5258 * 3.4.1.11. Their resources are allocated from the space
5259 * described by the VF BARx register in the PF's SR-IOV capability.
5260 * We can't influence their alignment here.
5265 /* check if specified PCI is target device to reassign */
5266 align
= pci_specified_resource_alignment(dev
, &resize
);
5270 if (dev
->hdr_type
== PCI_HEADER_TYPE_NORMAL
&&
5271 (dev
->class >> 8) == PCI_CLASS_BRIDGE_HOST
) {
5273 "Can't reassign resources to host bridge.\n");
5278 "Disabling memory decoding and releasing memory resources.\n");
5279 pci_read_config_word(dev
, PCI_COMMAND
, &command
);
5280 command
&= ~PCI_COMMAND_MEMORY
;
5281 pci_write_config_word(dev
, PCI_COMMAND
, command
);
5283 for (i
= 0; i
<= PCI_ROM_RESOURCE
; i
++)
5284 pci_request_resource_alignment(dev
, i
, align
, resize
);
5287 * Need to disable bridge's resource window,
5288 * to enable the kernel to reassign new resource
5291 if (dev
->hdr_type
== PCI_HEADER_TYPE_BRIDGE
&&
5292 (dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
5293 for (i
= PCI_BRIDGE_RESOURCES
; i
< PCI_NUM_RESOURCES
; i
++) {
5294 r
= &dev
->resource
[i
];
5295 if (!(r
->flags
& IORESOURCE_MEM
))
5297 r
->flags
|= IORESOURCE_UNSET
;
5298 r
->end
= resource_size(r
) - 1;
5301 pci_disable_bridge_window(dev
);
5305 static ssize_t
pci_set_resource_alignment_param(const char *buf
, size_t count
)
5307 if (count
> RESOURCE_ALIGNMENT_PARAM_SIZE
- 1)
5308 count
= RESOURCE_ALIGNMENT_PARAM_SIZE
- 1;
5309 spin_lock(&resource_alignment_lock
);
5310 strncpy(resource_alignment_param
, buf
, count
);
5311 resource_alignment_param
[count
] = '\0';
5312 spin_unlock(&resource_alignment_lock
);
5316 static ssize_t
pci_get_resource_alignment_param(char *buf
, size_t size
)
5319 spin_lock(&resource_alignment_lock
);
5320 count
= snprintf(buf
, size
, "%s", resource_alignment_param
);
5321 spin_unlock(&resource_alignment_lock
);
5325 static ssize_t
pci_resource_alignment_show(struct bus_type
*bus
, char *buf
)
5327 return pci_get_resource_alignment_param(buf
, PAGE_SIZE
);
5330 static ssize_t
pci_resource_alignment_store(struct bus_type
*bus
,
5331 const char *buf
, size_t count
)
5333 return pci_set_resource_alignment_param(buf
, count
);
5336 static BUS_ATTR(resource_alignment
, 0644, pci_resource_alignment_show
,
5337 pci_resource_alignment_store
);
5339 static int __init
pci_resource_alignment_sysfs_init(void)
5341 return bus_create_file(&pci_bus_type
,
5342 &bus_attr_resource_alignment
);
5344 late_initcall(pci_resource_alignment_sysfs_init
);
5346 static void pci_no_domains(void)
5348 #ifdef CONFIG_PCI_DOMAINS
5349 pci_domains_supported
= 0;
5353 #ifdef CONFIG_PCI_DOMAINS
5354 static atomic_t __domain_nr
= ATOMIC_INIT(-1);
5356 int pci_get_new_domain_nr(void)
5358 return atomic_inc_return(&__domain_nr
);
5361 #ifdef CONFIG_PCI_DOMAINS_GENERIC
5362 static int of_pci_bus_find_domain_nr(struct device
*parent
)
5364 static int use_dt_domains
= -1;
5368 domain
= of_get_pci_domain_nr(parent
->of_node
);
5370 * Check DT domain and use_dt_domains values.
5372 * If DT domain property is valid (domain >= 0) and
5373 * use_dt_domains != 0, the DT assignment is valid since this means
5374 * we have not previously allocated a domain number by using
5375 * pci_get_new_domain_nr(); we should also update use_dt_domains to
5376 * 1, to indicate that we have just assigned a domain number from
5379 * If DT domain property value is not valid (ie domain < 0), and we
5380 * have not previously assigned a domain number from DT
5381 * (use_dt_domains != 1) we should assign a domain number by
5384 * pci_get_new_domain_nr()
5386 * API and update the use_dt_domains value to keep track of method we
5387 * are using to assign domain numbers (use_dt_domains = 0).
5389 * All other combinations imply we have a platform that is trying
5390 * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
5391 * which is a recipe for domain mishandling and it is prevented by
5392 * invalidating the domain value (domain = -1) and printing a
5393 * corresponding error.
5395 if (domain
>= 0 && use_dt_domains
) {
5397 } else if (domain
< 0 && use_dt_domains
!= 1) {
5399 domain
= pci_get_new_domain_nr();
5401 dev_err(parent
, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
5402 parent
->of_node
->full_name
);
5409 int pci_bus_find_domain_nr(struct pci_bus
*bus
, struct device
*parent
)
5411 return acpi_disabled
? of_pci_bus_find_domain_nr(parent
) :
5412 acpi_pci_bus_find_domain_nr(bus
);
5418 * pci_ext_cfg_avail - can we access extended PCI config space?
5420 * Returns 1 if we can access PCI extended config space (offsets
5421 * greater than 0xff). This is the default implementation. Architecture
5422 * implementations can override this.
5424 int __weak
pci_ext_cfg_avail(void)
5429 void __weak
pci_fixup_cardbus(struct pci_bus
*bus
)
5432 EXPORT_SYMBOL(pci_fixup_cardbus
);
5434 static int __init
pci_setup(char *str
)
5437 char *k
= strchr(str
, ',');
5440 if (*str
&& (str
= pcibios_setup(str
)) && *str
) {
5441 if (!strcmp(str
, "nomsi")) {
5443 } else if (!strcmp(str
, "noaer")) {
5445 } else if (!strncmp(str
, "realloc=", 8)) {
5446 pci_realloc_get_opt(str
+ 8);
5447 } else if (!strncmp(str
, "realloc", 7)) {
5448 pci_realloc_get_opt("on");
5449 } else if (!strcmp(str
, "nodomains")) {
5451 } else if (!strncmp(str
, "noari", 5)) {
5452 pcie_ari_disabled
= true;
5453 } else if (!strncmp(str
, "cbiosize=", 9)) {
5454 pci_cardbus_io_size
= memparse(str
+ 9, &str
);
5455 } else if (!strncmp(str
, "cbmemsize=", 10)) {
5456 pci_cardbus_mem_size
= memparse(str
+ 10, &str
);
5457 } else if (!strncmp(str
, "resource_alignment=", 19)) {
5458 pci_set_resource_alignment_param(str
+ 19,
5460 } else if (!strncmp(str
, "ecrc=", 5)) {
5461 pcie_ecrc_get_policy(str
+ 5);
5462 } else if (!strncmp(str
, "hpiosize=", 9)) {
5463 pci_hotplug_io_size
= memparse(str
+ 9, &str
);
5464 } else if (!strncmp(str
, "hpmemsize=", 10)) {
5465 pci_hotplug_mem_size
= memparse(str
+ 10, &str
);
5466 } else if (!strncmp(str
, "hpbussize=", 10)) {
5467 pci_hotplug_bus_size
=
5468 simple_strtoul(str
+ 10, &str
, 0);
5469 if (pci_hotplug_bus_size
> 0xff)
5470 pci_hotplug_bus_size
= DEFAULT_HOTPLUG_BUS_SIZE
;
5471 } else if (!strncmp(str
, "pcie_bus_tune_off", 17)) {
5472 pcie_bus_config
= PCIE_BUS_TUNE_OFF
;
5473 } else if (!strncmp(str
, "pcie_bus_safe", 13)) {
5474 pcie_bus_config
= PCIE_BUS_SAFE
;
5475 } else if (!strncmp(str
, "pcie_bus_perf", 13)) {
5476 pcie_bus_config
= PCIE_BUS_PERFORMANCE
;
5477 } else if (!strncmp(str
, "pcie_bus_peer2peer", 18)) {
5478 pcie_bus_config
= PCIE_BUS_PEER2PEER
;
5479 } else if (!strncmp(str
, "pcie_scan_all", 13)) {
5480 pci_add_flags(PCI_SCAN_ALL_PCIE_DEVS
);
5482 printk(KERN_ERR
"PCI: Unknown option `%s'\n",
5490 early_param("pci", pci_setup
);