2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/of_device.h>
10 #include <linux/of_pci.h>
11 #include <linux/pci_hotplug.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/cpumask.h>
15 #include <linux/pci-aspm.h>
16 #include <linux/aer.h>
17 #include <linux/acpi.h>
18 #include <linux/irqdomain.h>
19 #include <linux/pm_runtime.h>
22 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
23 #define CARDBUS_RESERVE_BUSNR 3
25 static struct resource busn_resource
= {
29 .flags
= IORESOURCE_BUS
,
32 /* Ugh. Need to stop exporting this to modules. */
33 LIST_HEAD(pci_root_buses
);
34 EXPORT_SYMBOL(pci_root_buses
);
36 static LIST_HEAD(pci_domain_busn_res_list
);
38 struct pci_domain_busn_res
{
39 struct list_head list
;
44 static struct resource
*get_pci_domain_busn_res(int domain_nr
)
46 struct pci_domain_busn_res
*r
;
48 list_for_each_entry(r
, &pci_domain_busn_res_list
, list
)
49 if (r
->domain_nr
== domain_nr
)
52 r
= kzalloc(sizeof(*r
), GFP_KERNEL
);
56 r
->domain_nr
= domain_nr
;
59 r
->res
.flags
= IORESOURCE_BUS
| IORESOURCE_PCI_FIXED
;
61 list_add_tail(&r
->list
, &pci_domain_busn_res_list
);
66 static int find_anything(struct device
*dev
, void *data
)
72 * Some device drivers need know if pci is initiated.
73 * Basically, we think pci is not initiated when there
74 * is no device to be found on the pci_bus_type.
76 int no_pci_devices(void)
81 dev
= bus_find_device(&pci_bus_type
, NULL
, NULL
, find_anything
);
82 no_devices
= (dev
== NULL
);
86 EXPORT_SYMBOL(no_pci_devices
);
91 static void release_pcibus_dev(struct device
*dev
)
93 struct pci_bus
*pci_bus
= to_pci_bus(dev
);
95 put_device(pci_bus
->bridge
);
96 pci_bus_remove_resources(pci_bus
);
97 pci_release_bus_of_node(pci_bus
);
101 static struct class pcibus_class
= {
103 .dev_release
= &release_pcibus_dev
,
104 .dev_groups
= pcibus_groups
,
107 static int __init
pcibus_class_init(void)
109 return class_register(&pcibus_class
);
111 postcore_initcall(pcibus_class_init
);
113 static u64
pci_size(u64 base
, u64 maxbase
, u64 mask
)
115 u64 size
= mask
& maxbase
; /* Find the significant bits */
119 /* Get the lowest of them to find the decode size, and
120 from that the extent. */
121 size
= (size
& ~(size
-1)) - 1;
123 /* base == maxbase can be valid only if the BAR has
124 already been programmed with all 1s. */
125 if (base
== maxbase
&& ((base
| size
) & mask
) != mask
)
131 static inline unsigned long decode_bar(struct pci_dev
*dev
, u32 bar
)
136 if ((bar
& PCI_BASE_ADDRESS_SPACE
) == PCI_BASE_ADDRESS_SPACE_IO
) {
137 flags
= bar
& ~PCI_BASE_ADDRESS_IO_MASK
;
138 flags
|= IORESOURCE_IO
;
142 flags
= bar
& ~PCI_BASE_ADDRESS_MEM_MASK
;
143 flags
|= IORESOURCE_MEM
;
144 if (flags
& PCI_BASE_ADDRESS_MEM_PREFETCH
)
145 flags
|= IORESOURCE_PREFETCH
;
147 mem_type
= bar
& PCI_BASE_ADDRESS_MEM_TYPE_MASK
;
149 case PCI_BASE_ADDRESS_MEM_TYPE_32
:
151 case PCI_BASE_ADDRESS_MEM_TYPE_1M
:
152 /* 1M mem BAR treated as 32-bit BAR */
154 case PCI_BASE_ADDRESS_MEM_TYPE_64
:
155 flags
|= IORESOURCE_MEM_64
;
158 /* mem unknown type treated as 32-bit BAR */
164 #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
167 * pci_read_base - read a PCI BAR
168 * @dev: the PCI device
169 * @type: type of the BAR
170 * @res: resource buffer to be filled in
171 * @pos: BAR position in the config space
173 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
175 int __pci_read_base(struct pci_dev
*dev
, enum pci_bar_type type
,
176 struct resource
*res
, unsigned int pos
)
178 u32 l
= 0, sz
= 0, mask
;
179 u64 l64
, sz64
, mask64
;
181 struct pci_bus_region region
, inverted_region
;
183 mask
= type
? PCI_ROM_ADDRESS_MASK
: ~0;
185 /* No printks while decoding is disabled! */
186 if (!dev
->mmio_always_on
) {
187 pci_read_config_word(dev
, PCI_COMMAND
, &orig_cmd
);
188 if (orig_cmd
& PCI_COMMAND_DECODE_ENABLE
) {
189 pci_write_config_word(dev
, PCI_COMMAND
,
190 orig_cmd
& ~PCI_COMMAND_DECODE_ENABLE
);
194 res
->name
= pci_name(dev
);
196 pci_read_config_dword(dev
, pos
, &l
);
197 pci_write_config_dword(dev
, pos
, l
| mask
);
198 pci_read_config_dword(dev
, pos
, &sz
);
199 pci_write_config_dword(dev
, pos
, l
);
202 * All bits set in sz means the device isn't working properly.
203 * If the BAR isn't implemented, all bits must be 0. If it's a
204 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
207 if (sz
== 0xffffffff)
211 * I don't know how l can have all bits set. Copied from old code.
212 * Maybe it fixes a bug on some ancient platform.
217 if (type
== pci_bar_unknown
) {
218 res
->flags
= decode_bar(dev
, l
);
219 res
->flags
|= IORESOURCE_SIZEALIGN
;
220 if (res
->flags
& IORESOURCE_IO
) {
221 l64
= l
& PCI_BASE_ADDRESS_IO_MASK
;
222 sz64
= sz
& PCI_BASE_ADDRESS_IO_MASK
;
223 mask64
= PCI_BASE_ADDRESS_IO_MASK
& (u32
)IO_SPACE_LIMIT
;
225 l64
= l
& PCI_BASE_ADDRESS_MEM_MASK
;
226 sz64
= sz
& PCI_BASE_ADDRESS_MEM_MASK
;
227 mask64
= (u32
)PCI_BASE_ADDRESS_MEM_MASK
;
230 if (l
& PCI_ROM_ADDRESS_ENABLE
)
231 res
->flags
|= IORESOURCE_ROM_ENABLE
;
232 l64
= l
& PCI_ROM_ADDRESS_MASK
;
233 sz64
= sz
& PCI_ROM_ADDRESS_MASK
;
234 mask64
= PCI_ROM_ADDRESS_MASK
;
237 if (res
->flags
& IORESOURCE_MEM_64
) {
238 pci_read_config_dword(dev
, pos
+ 4, &l
);
239 pci_write_config_dword(dev
, pos
+ 4, ~0);
240 pci_read_config_dword(dev
, pos
+ 4, &sz
);
241 pci_write_config_dword(dev
, pos
+ 4, l
);
243 l64
|= ((u64
)l
<< 32);
244 sz64
|= ((u64
)sz
<< 32);
245 mask64
|= ((u64
)~0 << 32);
248 if (!dev
->mmio_always_on
&& (orig_cmd
& PCI_COMMAND_DECODE_ENABLE
))
249 pci_write_config_word(dev
, PCI_COMMAND
, orig_cmd
);
254 sz64
= pci_size(l64
, sz64
, mask64
);
256 dev_info(&dev
->dev
, FW_BUG
"reg 0x%x: invalid BAR (can't size)\n",
261 if (res
->flags
& IORESOURCE_MEM_64
) {
262 if ((sizeof(pci_bus_addr_t
) < 8 || sizeof(resource_size_t
) < 8)
263 && sz64
> 0x100000000ULL
) {
264 res
->flags
|= IORESOURCE_UNSET
| IORESOURCE_DISABLED
;
267 dev_err(&dev
->dev
, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
268 pos
, (unsigned long long)sz64
);
272 if ((sizeof(pci_bus_addr_t
) < 8) && l
) {
273 /* Above 32-bit boundary; try to reallocate */
274 res
->flags
|= IORESOURCE_UNSET
;
277 dev_info(&dev
->dev
, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n",
278 pos
, (unsigned long long)l64
);
284 region
.end
= l64
+ sz64
;
286 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
287 pcibios_resource_to_bus(dev
->bus
, &inverted_region
, res
);
290 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
291 * the corresponding resource address (the physical address used by
292 * the CPU. Converting that resource address back to a bus address
293 * should yield the original BAR value:
295 * resource_to_bus(bus_to_resource(A)) == A
297 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not
298 * be claimed by the device.
300 if (inverted_region
.start
!= region
.start
) {
301 res
->flags
|= IORESOURCE_UNSET
;
303 res
->end
= region
.end
- region
.start
;
304 dev_info(&dev
->dev
, "reg 0x%x: initial BAR value %#010llx invalid\n",
305 pos
, (unsigned long long)region
.start
);
315 dev_printk(KERN_DEBUG
, &dev
->dev
, "reg 0x%x: %pR\n", pos
, res
);
317 return (res
->flags
& IORESOURCE_MEM_64
) ? 1 : 0;
320 static void pci_read_bases(struct pci_dev
*dev
, unsigned int howmany
, int rom
)
322 unsigned int pos
, reg
;
324 if (dev
->non_compliant_bars
)
327 for (pos
= 0; pos
< howmany
; pos
++) {
328 struct resource
*res
= &dev
->resource
[pos
];
329 reg
= PCI_BASE_ADDRESS_0
+ (pos
<< 2);
330 pos
+= __pci_read_base(dev
, pci_bar_unknown
, res
, reg
);
334 struct resource
*res
= &dev
->resource
[PCI_ROM_RESOURCE
];
335 dev
->rom_base_reg
= rom
;
336 res
->flags
= IORESOURCE_MEM
| IORESOURCE_PREFETCH
|
337 IORESOURCE_READONLY
| IORESOURCE_SIZEALIGN
;
338 __pci_read_base(dev
, pci_bar_mem32
, res
, rom
);
342 static void pci_read_bridge_io(struct pci_bus
*child
)
344 struct pci_dev
*dev
= child
->self
;
345 u8 io_base_lo
, io_limit_lo
;
346 unsigned long io_mask
, io_granularity
, base
, limit
;
347 struct pci_bus_region region
;
348 struct resource
*res
;
350 io_mask
= PCI_IO_RANGE_MASK
;
351 io_granularity
= 0x1000;
352 if (dev
->io_window_1k
) {
353 /* Support 1K I/O space granularity */
354 io_mask
= PCI_IO_1K_RANGE_MASK
;
355 io_granularity
= 0x400;
358 res
= child
->resource
[0];
359 pci_read_config_byte(dev
, PCI_IO_BASE
, &io_base_lo
);
360 pci_read_config_byte(dev
, PCI_IO_LIMIT
, &io_limit_lo
);
361 base
= (io_base_lo
& io_mask
) << 8;
362 limit
= (io_limit_lo
& io_mask
) << 8;
364 if ((io_base_lo
& PCI_IO_RANGE_TYPE_MASK
) == PCI_IO_RANGE_TYPE_32
) {
365 u16 io_base_hi
, io_limit_hi
;
367 pci_read_config_word(dev
, PCI_IO_BASE_UPPER16
, &io_base_hi
);
368 pci_read_config_word(dev
, PCI_IO_LIMIT_UPPER16
, &io_limit_hi
);
369 base
|= ((unsigned long) io_base_hi
<< 16);
370 limit
|= ((unsigned long) io_limit_hi
<< 16);
374 res
->flags
= (io_base_lo
& PCI_IO_RANGE_TYPE_MASK
) | IORESOURCE_IO
;
376 region
.end
= limit
+ io_granularity
- 1;
377 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
378 dev_printk(KERN_DEBUG
, &dev
->dev
, " bridge window %pR\n", res
);
382 static void pci_read_bridge_mmio(struct pci_bus
*child
)
384 struct pci_dev
*dev
= child
->self
;
385 u16 mem_base_lo
, mem_limit_lo
;
386 unsigned long base
, limit
;
387 struct pci_bus_region region
;
388 struct resource
*res
;
390 res
= child
->resource
[1];
391 pci_read_config_word(dev
, PCI_MEMORY_BASE
, &mem_base_lo
);
392 pci_read_config_word(dev
, PCI_MEMORY_LIMIT
, &mem_limit_lo
);
393 base
= ((unsigned long) mem_base_lo
& PCI_MEMORY_RANGE_MASK
) << 16;
394 limit
= ((unsigned long) mem_limit_lo
& PCI_MEMORY_RANGE_MASK
) << 16;
396 res
->flags
= (mem_base_lo
& PCI_MEMORY_RANGE_TYPE_MASK
) | IORESOURCE_MEM
;
398 region
.end
= limit
+ 0xfffff;
399 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
400 dev_printk(KERN_DEBUG
, &dev
->dev
, " bridge window %pR\n", res
);
404 static void pci_read_bridge_mmio_pref(struct pci_bus
*child
)
406 struct pci_dev
*dev
= child
->self
;
407 u16 mem_base_lo
, mem_limit_lo
;
409 pci_bus_addr_t base
, limit
;
410 struct pci_bus_region region
;
411 struct resource
*res
;
413 res
= child
->resource
[2];
414 pci_read_config_word(dev
, PCI_PREF_MEMORY_BASE
, &mem_base_lo
);
415 pci_read_config_word(dev
, PCI_PREF_MEMORY_LIMIT
, &mem_limit_lo
);
416 base64
= (mem_base_lo
& PCI_PREF_RANGE_MASK
) << 16;
417 limit64
= (mem_limit_lo
& PCI_PREF_RANGE_MASK
) << 16;
419 if ((mem_base_lo
& PCI_PREF_RANGE_TYPE_MASK
) == PCI_PREF_RANGE_TYPE_64
) {
420 u32 mem_base_hi
, mem_limit_hi
;
422 pci_read_config_dword(dev
, PCI_PREF_BASE_UPPER32
, &mem_base_hi
);
423 pci_read_config_dword(dev
, PCI_PREF_LIMIT_UPPER32
, &mem_limit_hi
);
426 * Some bridges set the base > limit by default, and some
427 * (broken) BIOSes do not initialize them. If we find
428 * this, just assume they are not being used.
430 if (mem_base_hi
<= mem_limit_hi
) {
431 base64
|= (u64
) mem_base_hi
<< 32;
432 limit64
|= (u64
) mem_limit_hi
<< 32;
436 base
= (pci_bus_addr_t
) base64
;
437 limit
= (pci_bus_addr_t
) limit64
;
439 if (base
!= base64
) {
440 dev_err(&dev
->dev
, "can't handle bridge window above 4GB (bus address %#010llx)\n",
441 (unsigned long long) base64
);
446 res
->flags
= (mem_base_lo
& PCI_PREF_RANGE_TYPE_MASK
) |
447 IORESOURCE_MEM
| IORESOURCE_PREFETCH
;
448 if (res
->flags
& PCI_PREF_RANGE_TYPE_64
)
449 res
->flags
|= IORESOURCE_MEM_64
;
451 region
.end
= limit
+ 0xfffff;
452 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
453 dev_printk(KERN_DEBUG
, &dev
->dev
, " bridge window %pR\n", res
);
457 void pci_read_bridge_bases(struct pci_bus
*child
)
459 struct pci_dev
*dev
= child
->self
;
460 struct resource
*res
;
463 if (pci_is_root_bus(child
)) /* It's a host bus, nothing to read */
466 dev_info(&dev
->dev
, "PCI bridge to %pR%s\n",
468 dev
->transparent
? " (subtractive decode)" : "");
470 pci_bus_remove_resources(child
);
471 for (i
= 0; i
< PCI_BRIDGE_RESOURCE_NUM
; i
++)
472 child
->resource
[i
] = &dev
->resource
[PCI_BRIDGE_RESOURCES
+i
];
474 pci_read_bridge_io(child
);
475 pci_read_bridge_mmio(child
);
476 pci_read_bridge_mmio_pref(child
);
478 if (dev
->transparent
) {
479 pci_bus_for_each_resource(child
->parent
, res
, i
) {
480 if (res
&& res
->flags
) {
481 pci_bus_add_resource(child
, res
,
482 PCI_SUBTRACTIVE_DECODE
);
483 dev_printk(KERN_DEBUG
, &dev
->dev
,
484 " bridge window %pR (subtractive decode)\n",
491 static struct pci_bus
*pci_alloc_bus(struct pci_bus
*parent
)
495 b
= kzalloc(sizeof(*b
), GFP_KERNEL
);
499 INIT_LIST_HEAD(&b
->node
);
500 INIT_LIST_HEAD(&b
->children
);
501 INIT_LIST_HEAD(&b
->devices
);
502 INIT_LIST_HEAD(&b
->slots
);
503 INIT_LIST_HEAD(&b
->resources
);
504 b
->max_bus_speed
= PCI_SPEED_UNKNOWN
;
505 b
->cur_bus_speed
= PCI_SPEED_UNKNOWN
;
506 #ifdef CONFIG_PCI_DOMAINS_GENERIC
508 b
->domain_nr
= parent
->domain_nr
;
513 static void devm_pci_release_host_bridge_dev(struct device
*dev
)
515 struct pci_host_bridge
*bridge
= to_pci_host_bridge(dev
);
517 if (bridge
->release_fn
)
518 bridge
->release_fn(bridge
);
521 static void pci_release_host_bridge_dev(struct device
*dev
)
523 devm_pci_release_host_bridge_dev(dev
);
524 pci_free_host_bridge(to_pci_host_bridge(dev
));
527 struct pci_host_bridge
*pci_alloc_host_bridge(size_t priv
)
529 struct pci_host_bridge
*bridge
;
531 bridge
= kzalloc(sizeof(*bridge
) + priv
, GFP_KERNEL
);
535 INIT_LIST_HEAD(&bridge
->windows
);
536 bridge
->dev
.release
= pci_release_host_bridge_dev
;
540 EXPORT_SYMBOL(pci_alloc_host_bridge
);
542 struct pci_host_bridge
*devm_pci_alloc_host_bridge(struct device
*dev
,
545 struct pci_host_bridge
*bridge
;
547 bridge
= devm_kzalloc(dev
, sizeof(*bridge
) + priv
, GFP_KERNEL
);
551 INIT_LIST_HEAD(&bridge
->windows
);
552 bridge
->dev
.release
= devm_pci_release_host_bridge_dev
;
556 EXPORT_SYMBOL(devm_pci_alloc_host_bridge
);
558 void pci_free_host_bridge(struct pci_host_bridge
*bridge
)
560 pci_free_resource_list(&bridge
->windows
);
564 EXPORT_SYMBOL(pci_free_host_bridge
);
566 static const unsigned char pcix_bus_speed
[] = {
567 PCI_SPEED_UNKNOWN
, /* 0 */
568 PCI_SPEED_66MHz_PCIX
, /* 1 */
569 PCI_SPEED_100MHz_PCIX
, /* 2 */
570 PCI_SPEED_133MHz_PCIX
, /* 3 */
571 PCI_SPEED_UNKNOWN
, /* 4 */
572 PCI_SPEED_66MHz_PCIX_ECC
, /* 5 */
573 PCI_SPEED_100MHz_PCIX_ECC
, /* 6 */
574 PCI_SPEED_133MHz_PCIX_ECC
, /* 7 */
575 PCI_SPEED_UNKNOWN
, /* 8 */
576 PCI_SPEED_66MHz_PCIX_266
, /* 9 */
577 PCI_SPEED_100MHz_PCIX_266
, /* A */
578 PCI_SPEED_133MHz_PCIX_266
, /* B */
579 PCI_SPEED_UNKNOWN
, /* C */
580 PCI_SPEED_66MHz_PCIX_533
, /* D */
581 PCI_SPEED_100MHz_PCIX_533
, /* E */
582 PCI_SPEED_133MHz_PCIX_533
/* F */
585 const unsigned char pcie_link_speed
[] = {
586 PCI_SPEED_UNKNOWN
, /* 0 */
587 PCIE_SPEED_2_5GT
, /* 1 */
588 PCIE_SPEED_5_0GT
, /* 2 */
589 PCIE_SPEED_8_0GT
, /* 3 */
590 PCI_SPEED_UNKNOWN
, /* 4 */
591 PCI_SPEED_UNKNOWN
, /* 5 */
592 PCI_SPEED_UNKNOWN
, /* 6 */
593 PCI_SPEED_UNKNOWN
, /* 7 */
594 PCI_SPEED_UNKNOWN
, /* 8 */
595 PCI_SPEED_UNKNOWN
, /* 9 */
596 PCI_SPEED_UNKNOWN
, /* A */
597 PCI_SPEED_UNKNOWN
, /* B */
598 PCI_SPEED_UNKNOWN
, /* C */
599 PCI_SPEED_UNKNOWN
, /* D */
600 PCI_SPEED_UNKNOWN
, /* E */
601 PCI_SPEED_UNKNOWN
/* F */
604 void pcie_update_link_speed(struct pci_bus
*bus
, u16 linksta
)
606 bus
->cur_bus_speed
= pcie_link_speed
[linksta
& PCI_EXP_LNKSTA_CLS
];
608 EXPORT_SYMBOL_GPL(pcie_update_link_speed
);
610 static unsigned char agp_speeds
[] = {
618 static enum pci_bus_speed
agp_speed(int agp3
, int agpstat
)
624 else if (agpstat
& 2)
626 else if (agpstat
& 1)
638 return agp_speeds
[index
];
641 static void pci_set_bus_speed(struct pci_bus
*bus
)
643 struct pci_dev
*bridge
= bus
->self
;
646 pos
= pci_find_capability(bridge
, PCI_CAP_ID_AGP
);
648 pos
= pci_find_capability(bridge
, PCI_CAP_ID_AGP3
);
652 pci_read_config_dword(bridge
, pos
+ PCI_AGP_STATUS
, &agpstat
);
653 bus
->max_bus_speed
= agp_speed(agpstat
& 8, agpstat
& 7);
655 pci_read_config_dword(bridge
, pos
+ PCI_AGP_COMMAND
, &agpcmd
);
656 bus
->cur_bus_speed
= agp_speed(agpstat
& 8, agpcmd
& 7);
659 pos
= pci_find_capability(bridge
, PCI_CAP_ID_PCIX
);
662 enum pci_bus_speed max
;
664 pci_read_config_word(bridge
, pos
+ PCI_X_BRIDGE_SSTATUS
,
667 if (status
& PCI_X_SSTATUS_533MHZ
) {
668 max
= PCI_SPEED_133MHz_PCIX_533
;
669 } else if (status
& PCI_X_SSTATUS_266MHZ
) {
670 max
= PCI_SPEED_133MHz_PCIX_266
;
671 } else if (status
& PCI_X_SSTATUS_133MHZ
) {
672 if ((status
& PCI_X_SSTATUS_VERS
) == PCI_X_SSTATUS_V2
)
673 max
= PCI_SPEED_133MHz_PCIX_ECC
;
675 max
= PCI_SPEED_133MHz_PCIX
;
677 max
= PCI_SPEED_66MHz_PCIX
;
680 bus
->max_bus_speed
= max
;
681 bus
->cur_bus_speed
= pcix_bus_speed
[
682 (status
& PCI_X_SSTATUS_FREQ
) >> 6];
687 if (pci_is_pcie(bridge
)) {
691 pcie_capability_read_dword(bridge
, PCI_EXP_LNKCAP
, &linkcap
);
692 bus
->max_bus_speed
= pcie_link_speed
[linkcap
& PCI_EXP_LNKCAP_SLS
];
694 pcie_capability_read_word(bridge
, PCI_EXP_LNKSTA
, &linksta
);
695 pcie_update_link_speed(bus
, linksta
);
699 static struct irq_domain
*pci_host_bridge_msi_domain(struct pci_bus
*bus
)
701 struct irq_domain
*d
;
704 * Any firmware interface that can resolve the msi_domain
705 * should be called from here.
707 d
= pci_host_bridge_of_msi_domain(bus
);
709 d
= pci_host_bridge_acpi_msi_domain(bus
);
711 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
713 * If no IRQ domain was found via the OF tree, try looking it up
714 * directly through the fwnode_handle.
717 struct fwnode_handle
*fwnode
= pci_root_bus_fwnode(bus
);
720 d
= irq_find_matching_fwnode(fwnode
,
728 static void pci_set_bus_msi_domain(struct pci_bus
*bus
)
730 struct irq_domain
*d
;
734 * The bus can be a root bus, a subordinate bus, or a virtual bus
735 * created by an SR-IOV device. Walk up to the first bridge device
736 * found or derive the domain from the host bridge.
738 for (b
= bus
, d
= NULL
; !d
&& !pci_is_root_bus(b
); b
= b
->parent
) {
740 d
= dev_get_msi_domain(&b
->self
->dev
);
744 d
= pci_host_bridge_msi_domain(b
);
746 dev_set_msi_domain(&bus
->dev
, d
);
749 static int pci_register_host_bridge(struct pci_host_bridge
*bridge
)
751 struct device
*parent
= bridge
->dev
.parent
;
752 struct resource_entry
*window
, *n
;
753 struct pci_bus
*bus
, *b
;
754 resource_size_t offset
;
755 LIST_HEAD(resources
);
756 struct resource
*res
;
761 bus
= pci_alloc_bus(NULL
);
767 /* temporarily move resources off the list */
768 list_splice_init(&bridge
->windows
, &resources
);
769 bus
->sysdata
= bridge
->sysdata
;
770 bus
->msi
= bridge
->msi
;
771 bus
->ops
= bridge
->ops
;
772 bus
->number
= bus
->busn_res
.start
= bridge
->busnr
;
773 #ifdef CONFIG_PCI_DOMAINS_GENERIC
774 bus
->domain_nr
= pci_bus_find_domain_nr(bus
, parent
);
777 b
= pci_find_bus(pci_domain_nr(bus
), bridge
->busnr
);
779 /* If we already got to this bus through a different bridge, ignore it */
780 dev_dbg(&b
->dev
, "bus already known\n");
785 dev_set_name(&bridge
->dev
, "pci%04x:%02x", pci_domain_nr(bus
),
788 err
= pcibios_root_bridge_prepare(bridge
);
792 err
= device_register(&bridge
->dev
);
794 put_device(&bridge
->dev
);
796 bus
->bridge
= get_device(&bridge
->dev
);
797 device_enable_async_suspend(bus
->bridge
);
798 pci_set_bus_of_node(bus
);
799 pci_set_bus_msi_domain(bus
);
802 set_dev_node(bus
->bridge
, pcibus_to_node(bus
));
804 bus
->dev
.class = &pcibus_class
;
805 bus
->dev
.parent
= bus
->bridge
;
807 dev_set_name(&bus
->dev
, "%04x:%02x", pci_domain_nr(bus
), bus
->number
);
808 name
= dev_name(&bus
->dev
);
810 err
= device_register(&bus
->dev
);
814 pcibios_add_bus(bus
);
816 /* Create legacy_io and legacy_mem files for this bus */
817 pci_create_legacy_files(bus
);
820 dev_info(parent
, "PCI host bridge to bus %s\n", name
);
822 pr_info("PCI host bridge to bus %s\n", name
);
824 /* Add initial resources to the bus */
825 resource_list_for_each_entry_safe(window
, n
, &resources
) {
826 list_move_tail(&window
->node
, &bridge
->windows
);
827 offset
= window
->offset
;
830 if (res
->flags
& IORESOURCE_BUS
)
831 pci_bus_insert_busn_res(bus
, bus
->number
, res
->end
);
833 pci_bus_add_resource(bus
, res
, 0);
836 if (resource_type(res
) == IORESOURCE_IO
)
837 fmt
= " (bus address [%#06llx-%#06llx])";
839 fmt
= " (bus address [%#010llx-%#010llx])";
841 snprintf(addr
, sizeof(addr
), fmt
,
842 (unsigned long long)(res
->start
- offset
),
843 (unsigned long long)(res
->end
- offset
));
847 dev_info(&bus
->dev
, "root bus resource %pR%s\n", res
, addr
);
850 down_write(&pci_bus_sem
);
851 list_add_tail(&bus
->node
, &pci_root_buses
);
852 up_write(&pci_bus_sem
);
857 put_device(&bridge
->dev
);
858 device_unregister(&bridge
->dev
);
865 static struct pci_bus
*pci_alloc_child_bus(struct pci_bus
*parent
,
866 struct pci_dev
*bridge
, int busnr
)
868 struct pci_bus
*child
;
873 * Allocate a new bus, and inherit stuff from the parent..
875 child
= pci_alloc_bus(parent
);
879 child
->parent
= parent
;
880 child
->ops
= parent
->ops
;
881 child
->msi
= parent
->msi
;
882 child
->sysdata
= parent
->sysdata
;
883 child
->bus_flags
= parent
->bus_flags
;
885 /* initialize some portions of the bus device, but don't register it
886 * now as the parent is not properly set up yet.
888 child
->dev
.class = &pcibus_class
;
889 dev_set_name(&child
->dev
, "%04x:%02x", pci_domain_nr(child
), busnr
);
892 * Set up the primary, secondary and subordinate
895 child
->number
= child
->busn_res
.start
= busnr
;
896 child
->primary
= parent
->busn_res
.start
;
897 child
->busn_res
.end
= 0xff;
900 child
->dev
.parent
= parent
->bridge
;
904 child
->self
= bridge
;
905 child
->bridge
= get_device(&bridge
->dev
);
906 child
->dev
.parent
= child
->bridge
;
907 pci_set_bus_of_node(child
);
908 pci_set_bus_speed(child
);
910 /* Set up default resource pointers and names.. */
911 for (i
= 0; i
< PCI_BRIDGE_RESOURCE_NUM
; i
++) {
912 child
->resource
[i
] = &bridge
->resource
[PCI_BRIDGE_RESOURCES
+i
];
913 child
->resource
[i
]->name
= child
->name
;
915 bridge
->subordinate
= child
;
918 pci_set_bus_msi_domain(child
);
919 ret
= device_register(&child
->dev
);
922 pcibios_add_bus(child
);
924 if (child
->ops
->add_bus
) {
925 ret
= child
->ops
->add_bus(child
);
926 if (WARN_ON(ret
< 0))
927 dev_err(&child
->dev
, "failed to add bus: %d\n", ret
);
930 /* Create legacy_io and legacy_mem files for this bus */
931 pci_create_legacy_files(child
);
936 struct pci_bus
*pci_add_new_bus(struct pci_bus
*parent
, struct pci_dev
*dev
,
939 struct pci_bus
*child
;
941 child
= pci_alloc_child_bus(parent
, dev
, busnr
);
943 down_write(&pci_bus_sem
);
944 list_add_tail(&child
->node
, &parent
->children
);
945 up_write(&pci_bus_sem
);
949 EXPORT_SYMBOL(pci_add_new_bus
);
951 static void pci_enable_crs(struct pci_dev
*pdev
)
955 /* Enable CRS Software Visibility if supported */
956 pcie_capability_read_word(pdev
, PCI_EXP_RTCAP
, &root_cap
);
957 if (root_cap
& PCI_EXP_RTCAP_CRSVIS
)
958 pcie_capability_set_word(pdev
, PCI_EXP_RTCTL
,
959 PCI_EXP_RTCTL_CRSSVE
);
963 * If it's a bridge, configure it and scan the bus behind it.
964 * For CardBus bridges, we don't scan behind as the devices will
965 * be handled by the bridge driver itself.
967 * We need to process bridges in two passes -- first we scan those
968 * already configured by the BIOS and after we are done with all of
969 * them, we proceed to assigning numbers to the remaining buses in
970 * order to avoid overlaps between old and new bus numbers.
972 int pci_scan_bridge(struct pci_bus
*bus
, struct pci_dev
*dev
, int max
, int pass
)
974 struct pci_bus
*child
;
975 int is_cardbus
= (dev
->hdr_type
== PCI_HEADER_TYPE_CARDBUS
);
978 u8 primary
, secondary
, subordinate
;
982 * Make sure the bridge is powered on to be able to access config
983 * space of devices below it.
985 pm_runtime_get_sync(&dev
->dev
);
987 pci_read_config_dword(dev
, PCI_PRIMARY_BUS
, &buses
);
988 primary
= buses
& 0xFF;
989 secondary
= (buses
>> 8) & 0xFF;
990 subordinate
= (buses
>> 16) & 0xFF;
992 dev_dbg(&dev
->dev
, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
993 secondary
, subordinate
, pass
);
995 if (!primary
&& (primary
!= bus
->number
) && secondary
&& subordinate
) {
996 dev_warn(&dev
->dev
, "Primary bus is hard wired to 0\n");
997 primary
= bus
->number
;
1000 /* Check if setup is sensible at all */
1002 (primary
!= bus
->number
|| secondary
<= bus
->number
||
1003 secondary
> subordinate
)) {
1004 dev_info(&dev
->dev
, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
1005 secondary
, subordinate
);
1009 /* Disable MasterAbortMode during probing to avoid reporting
1010 of bus errors (in some architectures) */
1011 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &bctl
);
1012 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
,
1013 bctl
& ~PCI_BRIDGE_CTL_MASTER_ABORT
);
1015 pci_enable_crs(dev
);
1017 if ((secondary
|| subordinate
) && !pcibios_assign_all_busses() &&
1018 !is_cardbus
&& !broken
) {
1021 * Bus already configured by firmware, process it in the first
1022 * pass and just note the configuration.
1028 * The bus might already exist for two reasons: Either we are
1029 * rescanning the bus or the bus is reachable through more than
1030 * one bridge. The second case can happen with the i450NX
1033 child
= pci_find_bus(pci_domain_nr(bus
), secondary
);
1035 child
= pci_add_new_bus(bus
, dev
, secondary
);
1038 child
->primary
= primary
;
1039 pci_bus_insert_busn_res(child
, secondary
, subordinate
);
1040 child
->bridge_ctl
= bctl
;
1043 cmax
= pci_scan_child_bus(child
);
1044 if (cmax
> subordinate
)
1045 dev_warn(&dev
->dev
, "bridge has subordinate %02x but max busn %02x\n",
1047 /* subordinate should equal child->busn_res.end */
1048 if (subordinate
> max
)
1052 * We need to assign a number to this bus which we always
1053 * do in the second pass.
1056 if (pcibios_assign_all_busses() || broken
|| is_cardbus
)
1057 /* Temporarily disable forwarding of the
1058 configuration cycles on all bridges in
1059 this bus segment to avoid possible
1060 conflicts in the second pass between two
1061 bridges programmed with overlapping
1063 pci_write_config_dword(dev
, PCI_PRIMARY_BUS
,
1069 pci_write_config_word(dev
, PCI_STATUS
, 0xffff);
1071 /* Prevent assigning a bus number that already exists.
1072 * This can happen when a bridge is hot-plugged, so in
1073 * this case we only re-scan this bus. */
1074 child
= pci_find_bus(pci_domain_nr(bus
), max
+1);
1076 child
= pci_add_new_bus(bus
, dev
, max
+1);
1079 pci_bus_insert_busn_res(child
, max
+1, 0xff);
1082 buses
= (buses
& 0xff000000)
1083 | ((unsigned int)(child
->primary
) << 0)
1084 | ((unsigned int)(child
->busn_res
.start
) << 8)
1085 | ((unsigned int)(child
->busn_res
.end
) << 16);
1088 * yenta.c forces a secondary latency timer of 176.
1089 * Copy that behaviour here.
1092 buses
&= ~0xff000000;
1093 buses
|= CARDBUS_LATENCY_TIMER
<< 24;
1097 * We need to blast all three values with a single write.
1099 pci_write_config_dword(dev
, PCI_PRIMARY_BUS
, buses
);
1102 child
->bridge_ctl
= bctl
;
1103 max
= pci_scan_child_bus(child
);
1106 * For CardBus bridges, we leave 4 bus numbers
1107 * as cards with a PCI-to-PCI bridge can be
1110 for (i
= 0; i
< CARDBUS_RESERVE_BUSNR
; i
++) {
1111 struct pci_bus
*parent
= bus
;
1112 if (pci_find_bus(pci_domain_nr(bus
),
1115 while (parent
->parent
) {
1116 if ((!pcibios_assign_all_busses()) &&
1117 (parent
->busn_res
.end
> max
) &&
1118 (parent
->busn_res
.end
<= max
+i
)) {
1121 parent
= parent
->parent
;
1125 * Often, there are two cardbus bridges
1126 * -- try to leave one valid bus number
1136 * Set the subordinate bus number to its real value.
1138 pci_bus_update_busn_res_end(child
, max
);
1139 pci_write_config_byte(dev
, PCI_SUBORDINATE_BUS
, max
);
1142 sprintf(child
->name
,
1143 (is_cardbus
? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
1144 pci_domain_nr(bus
), child
->number
);
1146 /* Has only triggered on CardBus, fixup is in yenta_socket */
1147 while (bus
->parent
) {
1148 if ((child
->busn_res
.end
> bus
->busn_res
.end
) ||
1149 (child
->number
> bus
->busn_res
.end
) ||
1150 (child
->number
< bus
->number
) ||
1151 (child
->busn_res
.end
< bus
->number
)) {
1152 dev_info(&child
->dev
, "%pR %s hidden behind%s bridge %s %pR\n",
1154 (bus
->number
> child
->busn_res
.end
&&
1155 bus
->busn_res
.end
< child
->number
) ?
1156 "wholly" : "partially",
1157 bus
->self
->transparent
? " transparent" : "",
1158 dev_name(&bus
->dev
),
1165 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, bctl
);
1167 pm_runtime_put(&dev
->dev
);
1171 EXPORT_SYMBOL(pci_scan_bridge
);
1174 * Read interrupt line and base address registers.
1175 * The architecture-dependent code can tweak these, of course.
1177 static void pci_read_irq(struct pci_dev
*dev
)
1181 pci_read_config_byte(dev
, PCI_INTERRUPT_PIN
, &irq
);
1184 pci_read_config_byte(dev
, PCI_INTERRUPT_LINE
, &irq
);
1188 void set_pcie_port_type(struct pci_dev
*pdev
)
1193 struct pci_dev
*parent
;
1195 pos
= pci_find_capability(pdev
, PCI_CAP_ID_EXP
);
1199 pdev
->pcie_cap
= pos
;
1200 pci_read_config_word(pdev
, pos
+ PCI_EXP_FLAGS
, ®16
);
1201 pdev
->pcie_flags_reg
= reg16
;
1202 pci_read_config_word(pdev
, pos
+ PCI_EXP_DEVCAP
, ®16
);
1203 pdev
->pcie_mpss
= reg16
& PCI_EXP_DEVCAP_PAYLOAD
;
1206 * A Root Port or a PCI-to-PCIe bridge is always the upstream end
1207 * of a Link. No PCIe component has two Links. Two Links are
1208 * connected by a Switch that has a Port on each Link and internal
1209 * logic to connect the two Ports.
1211 type
= pci_pcie_type(pdev
);
1212 if (type
== PCI_EXP_TYPE_ROOT_PORT
||
1213 type
== PCI_EXP_TYPE_PCIE_BRIDGE
)
1214 pdev
->has_secondary_link
= 1;
1215 else if (type
== PCI_EXP_TYPE_UPSTREAM
||
1216 type
== PCI_EXP_TYPE_DOWNSTREAM
) {
1217 parent
= pci_upstream_bridge(pdev
);
1220 * Usually there's an upstream device (Root Port or Switch
1221 * Downstream Port), but we can't assume one exists.
1223 if (parent
&& !parent
->has_secondary_link
)
1224 pdev
->has_secondary_link
= 1;
1228 void set_pcie_hotplug_bridge(struct pci_dev
*pdev
)
1232 pcie_capability_read_dword(pdev
, PCI_EXP_SLTCAP
, ®32
);
1233 if (reg32
& PCI_EXP_SLTCAP_HPC
)
1234 pdev
->is_hotplug_bridge
= 1;
1237 static void set_pcie_thunderbolt(struct pci_dev
*dev
)
1242 while ((vsec
= pci_find_next_ext_capability(dev
, vsec
,
1243 PCI_EXT_CAP_ID_VNDR
))) {
1244 pci_read_config_dword(dev
, vsec
+ PCI_VNDR_HEADER
, &header
);
1246 /* Is the device part of a Thunderbolt controller? */
1247 if (dev
->vendor
== PCI_VENDOR_ID_INTEL
&&
1248 PCI_VNDR_HEADER_ID(header
) == PCI_VSEC_ID_INTEL_TBT
) {
1249 dev
->is_thunderbolt
= 1;
1256 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
1259 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
1260 * when forwarding a type1 configuration request the bridge must check that
1261 * the extended register address field is zero. The bridge is not permitted
1262 * to forward the transactions and must handle it as an Unsupported Request.
1263 * Some bridges do not follow this rule and simply drop the extended register
1264 * bits, resulting in the standard config space being aliased, every 256
1265 * bytes across the entire configuration space. Test for this condition by
1266 * comparing the first dword of each potential alias to the vendor/device ID.
1268 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
1269 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
1271 static bool pci_ext_cfg_is_aliased(struct pci_dev
*dev
)
1273 #ifdef CONFIG_PCI_QUIRKS
1277 pci_read_config_dword(dev
, PCI_VENDOR_ID
, &header
);
1279 for (pos
= PCI_CFG_SPACE_SIZE
;
1280 pos
< PCI_CFG_SPACE_EXP_SIZE
; pos
+= PCI_CFG_SPACE_SIZE
) {
1281 if (pci_read_config_dword(dev
, pos
, &tmp
) != PCIBIOS_SUCCESSFUL
1293 * pci_cfg_space_size - get the configuration space size of the PCI device.
1296 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1297 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1298 * access it. Maybe we don't have a way to generate extended config space
1299 * accesses, or the device is behind a reverse Express bridge. So we try
1300 * reading the dword at 0x100 which must either be 0 or a valid extended
1301 * capability header.
1303 static int pci_cfg_space_size_ext(struct pci_dev
*dev
)
1306 int pos
= PCI_CFG_SPACE_SIZE
;
1308 if (pci_read_config_dword(dev
, pos
, &status
) != PCIBIOS_SUCCESSFUL
)
1309 return PCI_CFG_SPACE_SIZE
;
1310 if (status
== 0xffffffff || pci_ext_cfg_is_aliased(dev
))
1311 return PCI_CFG_SPACE_SIZE
;
1313 return PCI_CFG_SPACE_EXP_SIZE
;
1316 int pci_cfg_space_size(struct pci_dev
*dev
)
1322 class = dev
->class >> 8;
1323 if (class == PCI_CLASS_BRIDGE_HOST
)
1324 return pci_cfg_space_size_ext(dev
);
1326 if (pci_is_pcie(dev
))
1327 return pci_cfg_space_size_ext(dev
);
1329 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1331 return PCI_CFG_SPACE_SIZE
;
1333 pci_read_config_dword(dev
, pos
+ PCI_X_STATUS
, &status
);
1334 if (status
& (PCI_X_STATUS_266MHZ
| PCI_X_STATUS_533MHZ
))
1335 return pci_cfg_space_size_ext(dev
);
1337 return PCI_CFG_SPACE_SIZE
;
1340 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1342 static void pci_msi_setup_pci_dev(struct pci_dev
*dev
)
1345 * Disable the MSI hardware to avoid screaming interrupts
1346 * during boot. This is the power on reset default so
1347 * usually this should be a noop.
1349 dev
->msi_cap
= pci_find_capability(dev
, PCI_CAP_ID_MSI
);
1351 pci_msi_set_enable(dev
, 0);
1353 dev
->msix_cap
= pci_find_capability(dev
, PCI_CAP_ID_MSIX
);
1355 pci_msix_clear_and_set_ctrl(dev
, PCI_MSIX_FLAGS_ENABLE
, 0);
1359 * pci_intx_mask_broken - test PCI_COMMAND_INTX_DISABLE writability
1362 * Test whether PCI_COMMAND_INTX_DISABLE is writable for @dev. Check this
1363 * at enumeration-time to avoid modifying PCI_COMMAND at run-time.
1365 static int pci_intx_mask_broken(struct pci_dev
*dev
)
1367 u16 orig
, toggle
, new;
1369 pci_read_config_word(dev
, PCI_COMMAND
, &orig
);
1370 toggle
= orig
^ PCI_COMMAND_INTX_DISABLE
;
1371 pci_write_config_word(dev
, PCI_COMMAND
, toggle
);
1372 pci_read_config_word(dev
, PCI_COMMAND
, &new);
1374 pci_write_config_word(dev
, PCI_COMMAND
, orig
);
1377 * PCI_COMMAND_INTX_DISABLE was reserved and read-only prior to PCI
1378 * r2.3, so strictly speaking, a device is not *broken* if it's not
1379 * writable. But we'll live with the misnomer for now.
1387 * pci_setup_device - fill in class and map information of a device
1388 * @dev: the device structure to fill
1390 * Initialize the device structure with information about the device's
1391 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1392 * Called at initialisation of the PCI subsystem and by CardBus services.
1393 * Returns 0 on success and negative if unknown type of device (not normal,
1394 * bridge or CardBus).
1396 int pci_setup_device(struct pci_dev
*dev
)
1402 struct pci_bus_region region
;
1403 struct resource
*res
;
1405 if (pci_read_config_byte(dev
, PCI_HEADER_TYPE
, &hdr_type
))
1408 dev
->sysdata
= dev
->bus
->sysdata
;
1409 dev
->dev
.parent
= dev
->bus
->bridge
;
1410 dev
->dev
.bus
= &pci_bus_type
;
1411 dev
->hdr_type
= hdr_type
& 0x7f;
1412 dev
->multifunction
= !!(hdr_type
& 0x80);
1413 dev
->error_state
= pci_channel_io_normal
;
1414 set_pcie_port_type(dev
);
1416 pci_dev_assign_slot(dev
);
1417 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1418 set this higher, assuming the system even supports it. */
1419 dev
->dma_mask
= 0xffffffff;
1421 dev_set_name(&dev
->dev
, "%04x:%02x:%02x.%d", pci_domain_nr(dev
->bus
),
1422 dev
->bus
->number
, PCI_SLOT(dev
->devfn
),
1423 PCI_FUNC(dev
->devfn
));
1425 pci_read_config_dword(dev
, PCI_CLASS_REVISION
, &class);
1426 dev
->revision
= class & 0xff;
1427 dev
->class = class >> 8; /* upper 3 bytes */
1429 dev_printk(KERN_DEBUG
, &dev
->dev
, "[%04x:%04x] type %02x class %#08x\n",
1430 dev
->vendor
, dev
->device
, dev
->hdr_type
, dev
->class);
1432 /* need to have dev->class ready */
1433 dev
->cfg_size
= pci_cfg_space_size(dev
);
1435 /* need to have dev->cfg_size ready */
1436 set_pcie_thunderbolt(dev
);
1438 /* "Unknown power state" */
1439 dev
->current_state
= PCI_UNKNOWN
;
1441 /* Early fixups, before probing the BARs */
1442 pci_fixup_device(pci_fixup_early
, dev
);
1443 /* device class may be changed after fixup */
1444 class = dev
->class >> 8;
1446 if (dev
->non_compliant_bars
) {
1447 pci_read_config_word(dev
, PCI_COMMAND
, &cmd
);
1448 if (cmd
& (PCI_COMMAND_IO
| PCI_COMMAND_MEMORY
)) {
1449 dev_info(&dev
->dev
, "device has non-compliant BARs; disabling IO/MEM decoding\n");
1450 cmd
&= ~PCI_COMMAND_IO
;
1451 cmd
&= ~PCI_COMMAND_MEMORY
;
1452 pci_write_config_word(dev
, PCI_COMMAND
, cmd
);
1456 dev
->broken_intx_masking
= pci_intx_mask_broken(dev
);
1458 switch (dev
->hdr_type
) { /* header type */
1459 case PCI_HEADER_TYPE_NORMAL
: /* standard header */
1460 if (class == PCI_CLASS_BRIDGE_PCI
)
1463 pci_read_bases(dev
, 6, PCI_ROM_ADDRESS
);
1464 pci_read_config_word(dev
, PCI_SUBSYSTEM_VENDOR_ID
, &dev
->subsystem_vendor
);
1465 pci_read_config_word(dev
, PCI_SUBSYSTEM_ID
, &dev
->subsystem_device
);
1468 * Do the ugly legacy mode stuff here rather than broken chip
1469 * quirk code. Legacy mode ATA controllers have fixed
1470 * addresses. These are not always echoed in BAR0-3, and
1471 * BAR0-3 in a few cases contain junk!
1473 if (class == PCI_CLASS_STORAGE_IDE
) {
1475 pci_read_config_byte(dev
, PCI_CLASS_PROG
, &progif
);
1476 if ((progif
& 1) == 0) {
1477 region
.start
= 0x1F0;
1479 res
= &dev
->resource
[0];
1480 res
->flags
= LEGACY_IO_RESOURCE
;
1481 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
1482 dev_info(&dev
->dev
, "legacy IDE quirk: reg 0x10: %pR\n",
1484 region
.start
= 0x3F6;
1486 res
= &dev
->resource
[1];
1487 res
->flags
= LEGACY_IO_RESOURCE
;
1488 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
1489 dev_info(&dev
->dev
, "legacy IDE quirk: reg 0x14: %pR\n",
1492 if ((progif
& 4) == 0) {
1493 region
.start
= 0x170;
1495 res
= &dev
->resource
[2];
1496 res
->flags
= LEGACY_IO_RESOURCE
;
1497 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
1498 dev_info(&dev
->dev
, "legacy IDE quirk: reg 0x18: %pR\n",
1500 region
.start
= 0x376;
1502 res
= &dev
->resource
[3];
1503 res
->flags
= LEGACY_IO_RESOURCE
;
1504 pcibios_bus_to_resource(dev
->bus
, res
, ®ion
);
1505 dev_info(&dev
->dev
, "legacy IDE quirk: reg 0x1c: %pR\n",
1511 case PCI_HEADER_TYPE_BRIDGE
: /* bridge header */
1512 if (class != PCI_CLASS_BRIDGE_PCI
)
1514 /* The PCI-to-PCI bridge spec requires that subtractive
1515 decoding (i.e. transparent) bridge must have programming
1516 interface code of 0x01. */
1518 dev
->transparent
= ((dev
->class & 0xff) == 1);
1519 pci_read_bases(dev
, 2, PCI_ROM_ADDRESS1
);
1520 set_pcie_hotplug_bridge(dev
);
1521 pos
= pci_find_capability(dev
, PCI_CAP_ID_SSVID
);
1523 pci_read_config_word(dev
, pos
+ PCI_SSVID_VENDOR_ID
, &dev
->subsystem_vendor
);
1524 pci_read_config_word(dev
, pos
+ PCI_SSVID_DEVICE_ID
, &dev
->subsystem_device
);
1528 case PCI_HEADER_TYPE_CARDBUS
: /* CardBus bridge header */
1529 if (class != PCI_CLASS_BRIDGE_CARDBUS
)
1532 pci_read_bases(dev
, 1, 0);
1533 pci_read_config_word(dev
, PCI_CB_SUBSYSTEM_VENDOR_ID
, &dev
->subsystem_vendor
);
1534 pci_read_config_word(dev
, PCI_CB_SUBSYSTEM_ID
, &dev
->subsystem_device
);
1537 default: /* unknown header */
1538 dev_err(&dev
->dev
, "unknown header type %02x, ignoring device\n",
1543 dev_err(&dev
->dev
, "ignoring class %#08x (doesn't match header type %02x)\n",
1544 dev
->class, dev
->hdr_type
);
1545 dev
->class = PCI_CLASS_NOT_DEFINED
<< 8;
1548 /* We found a fine healthy device, go go go... */
1552 static void pci_configure_mps(struct pci_dev
*dev
)
1554 struct pci_dev
*bridge
= pci_upstream_bridge(dev
);
1557 if (!pci_is_pcie(dev
) || !bridge
|| !pci_is_pcie(bridge
))
1560 mps
= pcie_get_mps(dev
);
1561 p_mps
= pcie_get_mps(bridge
);
1566 if (pcie_bus_config
== PCIE_BUS_TUNE_OFF
) {
1567 dev_warn(&dev
->dev
, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1568 mps
, pci_name(bridge
), p_mps
);
1573 * Fancier MPS configuration is done later by
1574 * pcie_bus_configure_settings()
1576 if (pcie_bus_config
!= PCIE_BUS_DEFAULT
)
1579 rc
= pcie_set_mps(dev
, p_mps
);
1581 dev_warn(&dev
->dev
, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1586 dev_info(&dev
->dev
, "Max Payload Size set to %d (was %d, max %d)\n",
1587 p_mps
, mps
, 128 << dev
->pcie_mpss
);
1590 static struct hpp_type0 pci_default_type0
= {
1592 .cache_line_size
= 8,
1593 .latency_timer
= 0x40,
1598 static void program_hpp_type0(struct pci_dev
*dev
, struct hpp_type0
*hpp
)
1600 u16 pci_cmd
, pci_bctl
;
1603 hpp
= &pci_default_type0
;
1605 if (hpp
->revision
> 1) {
1607 "PCI settings rev %d not supported; using defaults\n",
1609 hpp
= &pci_default_type0
;
1612 pci_write_config_byte(dev
, PCI_CACHE_LINE_SIZE
, hpp
->cache_line_size
);
1613 pci_write_config_byte(dev
, PCI_LATENCY_TIMER
, hpp
->latency_timer
);
1614 pci_read_config_word(dev
, PCI_COMMAND
, &pci_cmd
);
1615 if (hpp
->enable_serr
)
1616 pci_cmd
|= PCI_COMMAND_SERR
;
1617 if (hpp
->enable_perr
)
1618 pci_cmd
|= PCI_COMMAND_PARITY
;
1619 pci_write_config_word(dev
, PCI_COMMAND
, pci_cmd
);
1621 /* Program bridge control value */
1622 if ((dev
->class >> 8) == PCI_CLASS_BRIDGE_PCI
) {
1623 pci_write_config_byte(dev
, PCI_SEC_LATENCY_TIMER
,
1624 hpp
->latency_timer
);
1625 pci_read_config_word(dev
, PCI_BRIDGE_CONTROL
, &pci_bctl
);
1626 if (hpp
->enable_serr
)
1627 pci_bctl
|= PCI_BRIDGE_CTL_SERR
;
1628 if (hpp
->enable_perr
)
1629 pci_bctl
|= PCI_BRIDGE_CTL_PARITY
;
1630 pci_write_config_word(dev
, PCI_BRIDGE_CONTROL
, pci_bctl
);
1634 static void program_hpp_type1(struct pci_dev
*dev
, struct hpp_type1
*hpp
)
1641 pos
= pci_find_capability(dev
, PCI_CAP_ID_PCIX
);
1645 dev_warn(&dev
->dev
, "PCI-X settings not supported\n");
1648 static bool pcie_root_rcb_set(struct pci_dev
*dev
)
1650 struct pci_dev
*rp
= pcie_find_root_port(dev
);
1656 pcie_capability_read_word(rp
, PCI_EXP_LNKCTL
, &lnkctl
);
1657 if (lnkctl
& PCI_EXP_LNKCTL_RCB
)
1663 static void program_hpp_type2(struct pci_dev
*dev
, struct hpp_type2
*hpp
)
1671 if (!pci_is_pcie(dev
))
1674 if (hpp
->revision
> 1) {
1675 dev_warn(&dev
->dev
, "PCIe settings rev %d not supported\n",
1681 * Don't allow _HPX to change MPS or MRRS settings. We manage
1682 * those to make sure they're consistent with the rest of the
1685 hpp
->pci_exp_devctl_and
|= PCI_EXP_DEVCTL_PAYLOAD
|
1686 PCI_EXP_DEVCTL_READRQ
;
1687 hpp
->pci_exp_devctl_or
&= ~(PCI_EXP_DEVCTL_PAYLOAD
|
1688 PCI_EXP_DEVCTL_READRQ
);
1690 /* Initialize Device Control Register */
1691 pcie_capability_clear_and_set_word(dev
, PCI_EXP_DEVCTL
,
1692 ~hpp
->pci_exp_devctl_and
, hpp
->pci_exp_devctl_or
);
1694 /* Initialize Link Control Register */
1695 if (pcie_cap_has_lnkctl(dev
)) {
1698 * If the Root Port supports Read Completion Boundary of
1699 * 128, set RCB to 128. Otherwise, clear it.
1701 hpp
->pci_exp_lnkctl_and
|= PCI_EXP_LNKCTL_RCB
;
1702 hpp
->pci_exp_lnkctl_or
&= ~PCI_EXP_LNKCTL_RCB
;
1703 if (pcie_root_rcb_set(dev
))
1704 hpp
->pci_exp_lnkctl_or
|= PCI_EXP_LNKCTL_RCB
;
1706 pcie_capability_clear_and_set_word(dev
, PCI_EXP_LNKCTL
,
1707 ~hpp
->pci_exp_lnkctl_and
, hpp
->pci_exp_lnkctl_or
);
1710 /* Find Advanced Error Reporting Enhanced Capability */
1711 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ERR
);
1715 /* Initialize Uncorrectable Error Mask Register */
1716 pci_read_config_dword(dev
, pos
+ PCI_ERR_UNCOR_MASK
, ®32
);
1717 reg32
= (reg32
& hpp
->unc_err_mask_and
) | hpp
->unc_err_mask_or
;
1718 pci_write_config_dword(dev
, pos
+ PCI_ERR_UNCOR_MASK
, reg32
);
1720 /* Initialize Uncorrectable Error Severity Register */
1721 pci_read_config_dword(dev
, pos
+ PCI_ERR_UNCOR_SEVER
, ®32
);
1722 reg32
= (reg32
& hpp
->unc_err_sever_and
) | hpp
->unc_err_sever_or
;
1723 pci_write_config_dword(dev
, pos
+ PCI_ERR_UNCOR_SEVER
, reg32
);
1725 /* Initialize Correctable Error Mask Register */
1726 pci_read_config_dword(dev
, pos
+ PCI_ERR_COR_MASK
, ®32
);
1727 reg32
= (reg32
& hpp
->cor_err_mask_and
) | hpp
->cor_err_mask_or
;
1728 pci_write_config_dword(dev
, pos
+ PCI_ERR_COR_MASK
, reg32
);
1730 /* Initialize Advanced Error Capabilities and Control Register */
1731 pci_read_config_dword(dev
, pos
+ PCI_ERR_CAP
, ®32
);
1732 reg32
= (reg32
& hpp
->adv_err_cap_and
) | hpp
->adv_err_cap_or
;
1733 /* Don't enable ECRC generation or checking if unsupported */
1734 if (!(reg32
& PCI_ERR_CAP_ECRC_GENC
))
1735 reg32
&= ~PCI_ERR_CAP_ECRC_GENE
;
1736 if (!(reg32
& PCI_ERR_CAP_ECRC_CHKC
))
1737 reg32
&= ~PCI_ERR_CAP_ECRC_CHKE
;
1738 pci_write_config_dword(dev
, pos
+ PCI_ERR_CAP
, reg32
);
1741 * FIXME: The following two registers are not supported yet.
1743 * o Secondary Uncorrectable Error Severity Register
1744 * o Secondary Uncorrectable Error Mask Register
1748 int pci_configure_extended_tags(struct pci_dev
*dev
, void *ign
)
1750 struct pci_host_bridge
*host
;
1755 if (!pci_is_pcie(dev
))
1758 ret
= pcie_capability_read_dword(dev
, PCI_EXP_DEVCAP
, &cap
);
1762 if (!(cap
& PCI_EXP_DEVCAP_EXT_TAG
))
1765 ret
= pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &ctl
);
1769 host
= pci_find_host_bridge(dev
->bus
);
1774 * If some device in the hierarchy doesn't handle Extended Tags
1775 * correctly, make sure they're disabled.
1777 if (host
->no_ext_tags
) {
1778 if (ctl
& PCI_EXP_DEVCTL_EXT_TAG
) {
1779 dev_info(&dev
->dev
, "disabling Extended Tags\n");
1780 pcie_capability_clear_word(dev
, PCI_EXP_DEVCTL
,
1781 PCI_EXP_DEVCTL_EXT_TAG
);
1786 if (!(ctl
& PCI_EXP_DEVCTL_EXT_TAG
)) {
1787 dev_info(&dev
->dev
, "enabling Extended Tags\n");
1788 pcie_capability_set_word(dev
, PCI_EXP_DEVCTL
,
1789 PCI_EXP_DEVCTL_EXT_TAG
);
1795 * pcie_relaxed_ordering_enabled - Probe for PCIe relaxed ordering enable
1796 * @dev: PCI device to query
1798 * Returns true if the device has enabled relaxed ordering attribute.
1800 bool pcie_relaxed_ordering_enabled(struct pci_dev
*dev
)
1804 pcie_capability_read_word(dev
, PCI_EXP_DEVCTL
, &v
);
1806 return !!(v
& PCI_EXP_DEVCTL_RELAX_EN
);
1808 EXPORT_SYMBOL(pcie_relaxed_ordering_enabled
);
1810 static void pci_configure_relaxed_ordering(struct pci_dev
*dev
)
1812 struct pci_dev
*root
;
1814 /* PCI_EXP_DEVICE_RELAX_EN is RsvdP in VFs */
1818 if (!pcie_relaxed_ordering_enabled(dev
))
1822 * For now, we only deal with Relaxed Ordering issues with Root
1823 * Ports. Peer-to-Peer DMA is another can of worms.
1825 root
= pci_find_pcie_root_port(dev
);
1829 if (root
->dev_flags
& PCI_DEV_FLAGS_NO_RELAXED_ORDERING
) {
1830 pcie_capability_clear_word(dev
, PCI_EXP_DEVCTL
,
1831 PCI_EXP_DEVCTL_RELAX_EN
);
1832 dev_info(&dev
->dev
, "Disable Relaxed Ordering because the Root Port didn't support it\n");
1836 static void pci_configure_device(struct pci_dev
*dev
)
1838 struct hotplug_params hpp
;
1841 pci_configure_mps(dev
);
1842 pci_configure_extended_tags(dev
, NULL
);
1843 pci_configure_relaxed_ordering(dev
);
1845 memset(&hpp
, 0, sizeof(hpp
));
1846 ret
= pci_get_hp_params(dev
, &hpp
);
1850 program_hpp_type2(dev
, hpp
.t2
);
1851 program_hpp_type1(dev
, hpp
.t1
);
1852 program_hpp_type0(dev
, hpp
.t0
);
1855 static void pci_release_capabilities(struct pci_dev
*dev
)
1857 pci_vpd_release(dev
);
1858 pci_iov_release(dev
);
1859 pci_free_cap_save_buffers(dev
);
1863 * pci_release_dev - free a pci device structure when all users of it are finished.
1864 * @dev: device that's been disconnected
1866 * Will be called only by the device core when all users of this pci device are
1869 static void pci_release_dev(struct device
*dev
)
1871 struct pci_dev
*pci_dev
;
1873 pci_dev
= to_pci_dev(dev
);
1874 pci_release_capabilities(pci_dev
);
1875 pci_release_of_node(pci_dev
);
1876 pcibios_release_device(pci_dev
);
1877 pci_bus_put(pci_dev
->bus
);
1878 kfree(pci_dev
->driver_override
);
1879 kfree(pci_dev
->dma_alias_mask
);
1883 struct pci_dev
*pci_alloc_dev(struct pci_bus
*bus
)
1885 struct pci_dev
*dev
;
1887 dev
= kzalloc(sizeof(struct pci_dev
), GFP_KERNEL
);
1891 INIT_LIST_HEAD(&dev
->bus_list
);
1892 dev
->dev
.type
= &pci_dev_type
;
1893 dev
->bus
= pci_bus_get(bus
);
1897 EXPORT_SYMBOL(pci_alloc_dev
);
1899 static bool pci_bus_crs_vendor_id(u32 l
)
1901 return (l
& 0xffff) == 0x0001;
1904 static bool pci_bus_wait_crs(struct pci_bus
*bus
, int devfn
, u32
*l
,
1909 if (!pci_bus_crs_vendor_id(*l
))
1910 return true; /* not a CRS completion */
1913 return false; /* CRS, but caller doesn't want to wait */
1916 * We got the reserved Vendor ID that indicates a completion with
1917 * Configuration Request Retry Status (CRS). Retry until we get a
1918 * valid Vendor ID or we time out.
1920 while (pci_bus_crs_vendor_id(*l
)) {
1921 if (delay
> timeout
) {
1922 pr_warn("pci %04x:%02x:%02x.%d: not ready after %dms; giving up\n",
1923 pci_domain_nr(bus
), bus
->number
,
1924 PCI_SLOT(devfn
), PCI_FUNC(devfn
), delay
- 1);
1929 pr_info("pci %04x:%02x:%02x.%d: not ready after %dms; waiting\n",
1930 pci_domain_nr(bus
), bus
->number
,
1931 PCI_SLOT(devfn
), PCI_FUNC(devfn
), delay
- 1);
1936 if (pci_bus_read_config_dword(bus
, devfn
, PCI_VENDOR_ID
, l
))
1941 pr_info("pci %04x:%02x:%02x.%d: ready after %dms\n",
1942 pci_domain_nr(bus
), bus
->number
,
1943 PCI_SLOT(devfn
), PCI_FUNC(devfn
), delay
- 1);
1948 bool pci_bus_read_dev_vendor_id(struct pci_bus
*bus
, int devfn
, u32
*l
,
1951 if (pci_bus_read_config_dword(bus
, devfn
, PCI_VENDOR_ID
, l
))
1954 /* some broken boards return 0 or ~0 if a slot is empty: */
1955 if (*l
== 0xffffffff || *l
== 0x00000000 ||
1956 *l
== 0x0000ffff || *l
== 0xffff0000)
1959 if (pci_bus_crs_vendor_id(*l
))
1960 return pci_bus_wait_crs(bus
, devfn
, l
, timeout
);
1964 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id
);
1967 * Read the config data for a PCI device, sanity-check it
1968 * and fill in the dev structure...
1970 static struct pci_dev
*pci_scan_device(struct pci_bus
*bus
, int devfn
)
1972 struct pci_dev
*dev
;
1975 if (!pci_bus_read_dev_vendor_id(bus
, devfn
, &l
, 60*1000))
1978 dev
= pci_alloc_dev(bus
);
1983 dev
->vendor
= l
& 0xffff;
1984 dev
->device
= (l
>> 16) & 0xffff;
1986 pci_set_of_node(dev
);
1988 if (pci_setup_device(dev
)) {
1989 pci_bus_put(dev
->bus
);
1997 static void pci_init_capabilities(struct pci_dev
*dev
)
1999 /* Enhanced Allocation */
2002 /* Setup MSI caps & disable MSI/MSI-X interrupts */
2003 pci_msi_setup_pci_dev(dev
);
2005 /* Buffers for saving PCIe and PCI-X capabilities */
2006 pci_allocate_cap_save_buffers(dev
);
2008 /* Power Management */
2011 /* Vital Product Data */
2014 /* Alternative Routing-ID Forwarding */
2015 pci_configure_ari(dev
);
2017 /* Single Root I/O Virtualization */
2020 /* Address Translation Services */
2023 /* Enable ACS P2P upstream forwarding */
2024 pci_enable_acs(dev
);
2026 /* Precision Time Measurement */
2029 /* Advanced Error Reporting */
2034 * This is the equivalent of pci_host_bridge_msi_domain that acts on
2035 * devices. Firmware interfaces that can select the MSI domain on a
2036 * per-device basis should be called from here.
2038 static struct irq_domain
*pci_dev_msi_domain(struct pci_dev
*dev
)
2040 struct irq_domain
*d
;
2043 * If a domain has been set through the pcibios_add_device
2044 * callback, then this is the one (platform code knows best).
2046 d
= dev_get_msi_domain(&dev
->dev
);
2051 * Let's see if we have a firmware interface able to provide
2054 d
= pci_msi_get_device_domain(dev
);
2061 static void pci_set_msi_domain(struct pci_dev
*dev
)
2063 struct irq_domain
*d
;
2066 * If the platform or firmware interfaces cannot supply a
2067 * device-specific MSI domain, then inherit the default domain
2068 * from the host bridge itself.
2070 d
= pci_dev_msi_domain(dev
);
2072 d
= dev_get_msi_domain(&dev
->bus
->dev
);
2074 dev_set_msi_domain(&dev
->dev
, d
);
2077 void pci_device_add(struct pci_dev
*dev
, struct pci_bus
*bus
)
2081 pci_configure_device(dev
);
2083 device_initialize(&dev
->dev
);
2084 dev
->dev
.release
= pci_release_dev
;
2086 set_dev_node(&dev
->dev
, pcibus_to_node(bus
));
2087 dev
->dev
.dma_mask
= &dev
->dma_mask
;
2088 dev
->dev
.dma_parms
= &dev
->dma_parms
;
2089 dev
->dev
.coherent_dma_mask
= 0xffffffffull
;
2091 pci_set_dma_max_seg_size(dev
, 65536);
2092 pci_set_dma_seg_boundary(dev
, 0xffffffff);
2094 /* Fix up broken headers */
2095 pci_fixup_device(pci_fixup_header
, dev
);
2097 /* moved out from quirk header fixup code */
2098 pci_reassigndev_resource_alignment(dev
);
2100 /* Clear the state_saved flag. */
2101 dev
->state_saved
= false;
2103 /* Initialize various capabilities */
2104 pci_init_capabilities(dev
);
2107 * Add the device to our list of discovered devices
2108 * and the bus list for fixup functions, etc.
2110 down_write(&pci_bus_sem
);
2111 list_add_tail(&dev
->bus_list
, &bus
->devices
);
2112 up_write(&pci_bus_sem
);
2114 ret
= pcibios_add_device(dev
);
2117 /* Setup MSI irq domain */
2118 pci_set_msi_domain(dev
);
2120 /* Notifier could use PCI capabilities */
2121 dev
->match_driver
= false;
2122 ret
= device_add(&dev
->dev
);
2126 struct pci_dev
*pci_scan_single_device(struct pci_bus
*bus
, int devfn
)
2128 struct pci_dev
*dev
;
2130 dev
= pci_get_slot(bus
, devfn
);
2136 dev
= pci_scan_device(bus
, devfn
);
2140 pci_device_add(dev
, bus
);
2144 EXPORT_SYMBOL(pci_scan_single_device
);
2146 static unsigned next_fn(struct pci_bus
*bus
, struct pci_dev
*dev
, unsigned fn
)
2152 if (pci_ari_enabled(bus
)) {
2155 pos
= pci_find_ext_capability(dev
, PCI_EXT_CAP_ID_ARI
);
2159 pci_read_config_word(dev
, pos
+ PCI_ARI_CAP
, &cap
);
2160 next_fn
= PCI_ARI_CAP_NFN(cap
);
2162 return 0; /* protect against malformed list */
2167 /* dev may be NULL for non-contiguous multifunction devices */
2168 if (!dev
|| dev
->multifunction
)
2169 return (fn
+ 1) % 8;
2174 static int only_one_child(struct pci_bus
*bus
)
2176 struct pci_dev
*parent
= bus
->self
;
2178 if (!parent
|| !pci_is_pcie(parent
))
2180 if (pci_pcie_type(parent
) == PCI_EXP_TYPE_ROOT_PORT
)
2184 * PCIe downstream ports are bridges that normally lead to only a
2185 * device 0, but if PCI_SCAN_ALL_PCIE_DEVS is set, scan all
2186 * possible devices, not just device 0. See PCIe spec r3.0,
2189 if (parent
->has_secondary_link
&&
2190 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS
))
2196 * pci_scan_slot - scan a PCI slot on a bus for devices.
2197 * @bus: PCI bus to scan
2198 * @devfn: slot number to scan (must have zero function.)
2200 * Scan a PCI slot on the specified PCI bus for devices, adding
2201 * discovered devices to the @bus->devices list. New devices
2202 * will not have is_added set.
2204 * Returns the number of new devices found.
2206 int pci_scan_slot(struct pci_bus
*bus
, int devfn
)
2208 unsigned fn
, nr
= 0;
2209 struct pci_dev
*dev
;
2211 if (only_one_child(bus
) && (devfn
> 0))
2212 return 0; /* Already scanned the entire slot */
2214 dev
= pci_scan_single_device(bus
, devfn
);
2220 for (fn
= next_fn(bus
, dev
, 0); fn
> 0; fn
= next_fn(bus
, dev
, fn
)) {
2221 dev
= pci_scan_single_device(bus
, devfn
+ fn
);
2225 dev
->multifunction
= 1;
2229 /* only one slot has pcie device */
2230 if (bus
->self
&& nr
)
2231 pcie_aspm_init_link_state(bus
->self
);
2235 EXPORT_SYMBOL(pci_scan_slot
);
2237 static int pcie_find_smpss(struct pci_dev
*dev
, void *data
)
2241 if (!pci_is_pcie(dev
))
2245 * We don't have a way to change MPS settings on devices that have
2246 * drivers attached. A hot-added device might support only the minimum
2247 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
2248 * where devices may be hot-added, we limit the fabric MPS to 128 so
2249 * hot-added devices will work correctly.
2251 * However, if we hot-add a device to a slot directly below a Root
2252 * Port, it's impossible for there to be other existing devices below
2253 * the port. We don't limit the MPS in this case because we can
2254 * reconfigure MPS on both the Root Port and the hot-added device,
2255 * and there are no other devices involved.
2257 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
2259 if (dev
->is_hotplug_bridge
&&
2260 pci_pcie_type(dev
) != PCI_EXP_TYPE_ROOT_PORT
)
2263 if (*smpss
> dev
->pcie_mpss
)
2264 *smpss
= dev
->pcie_mpss
;
2269 static void pcie_write_mps(struct pci_dev
*dev
, int mps
)
2273 if (pcie_bus_config
== PCIE_BUS_PERFORMANCE
) {
2274 mps
= 128 << dev
->pcie_mpss
;
2276 if (pci_pcie_type(dev
) != PCI_EXP_TYPE_ROOT_PORT
&&
2278 /* For "Performance", the assumption is made that
2279 * downstream communication will never be larger than
2280 * the MRRS. So, the MPS only needs to be configured
2281 * for the upstream communication. This being the case,
2282 * walk from the top down and set the MPS of the child
2283 * to that of the parent bus.
2285 * Configure the device MPS with the smaller of the
2286 * device MPSS or the bridge MPS (which is assumed to be
2287 * properly configured at this point to the largest
2288 * allowable MPS based on its parent bus).
2290 mps
= min(mps
, pcie_get_mps(dev
->bus
->self
));
2293 rc
= pcie_set_mps(dev
, mps
);
2295 dev_err(&dev
->dev
, "Failed attempting to set the MPS\n");
2298 static void pcie_write_mrrs(struct pci_dev
*dev
)
2302 /* In the "safe" case, do not configure the MRRS. There appear to be
2303 * issues with setting MRRS to 0 on a number of devices.
2305 if (pcie_bus_config
!= PCIE_BUS_PERFORMANCE
)
2308 /* For Max performance, the MRRS must be set to the largest supported
2309 * value. However, it cannot be configured larger than the MPS the
2310 * device or the bus can support. This should already be properly
2311 * configured by a prior call to pcie_write_mps.
2313 mrrs
= pcie_get_mps(dev
);
2315 /* MRRS is a R/W register. Invalid values can be written, but a
2316 * subsequent read will verify if the value is acceptable or not.
2317 * If the MRRS value provided is not acceptable (e.g., too large),
2318 * shrink the value until it is acceptable to the HW.
2320 while (mrrs
!= pcie_get_readrq(dev
) && mrrs
>= 128) {
2321 rc
= pcie_set_readrq(dev
, mrrs
);
2325 dev_warn(&dev
->dev
, "Failed attempting to set the MRRS\n");
2330 dev_err(&dev
->dev
, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
2333 static int pcie_bus_configure_set(struct pci_dev
*dev
, void *data
)
2337 if (!pci_is_pcie(dev
))
2340 if (pcie_bus_config
== PCIE_BUS_TUNE_OFF
||
2341 pcie_bus_config
== PCIE_BUS_DEFAULT
)
2344 mps
= 128 << *(u8
*)data
;
2345 orig_mps
= pcie_get_mps(dev
);
2347 pcie_write_mps(dev
, mps
);
2348 pcie_write_mrrs(dev
);
2350 dev_info(&dev
->dev
, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
2351 pcie_get_mps(dev
), 128 << dev
->pcie_mpss
,
2352 orig_mps
, pcie_get_readrq(dev
));
2357 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
2358 * parents then children fashion. If this changes, then this code will not
2361 void pcie_bus_configure_settings(struct pci_bus
*bus
)
2368 if (!pci_is_pcie(bus
->self
))
2371 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
2372 * to be aware of the MPS of the destination. To work around this,
2373 * simply force the MPS of the entire system to the smallest possible.
2375 if (pcie_bus_config
== PCIE_BUS_PEER2PEER
)
2378 if (pcie_bus_config
== PCIE_BUS_SAFE
) {
2379 smpss
= bus
->self
->pcie_mpss
;
2381 pcie_find_smpss(bus
->self
, &smpss
);
2382 pci_walk_bus(bus
, pcie_find_smpss
, &smpss
);
2385 pcie_bus_configure_set(bus
->self
, &smpss
);
2386 pci_walk_bus(bus
, pcie_bus_configure_set
, &smpss
);
2388 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings
);
2391 * Called after each bus is probed, but before its children are examined. This
2392 * is marked as __weak because multiple architectures define it.
2394 void __weak
pcibios_fixup_bus(struct pci_bus
*bus
)
2396 /* nothing to do, expected to be removed in the future */
2399 unsigned int pci_scan_child_bus(struct pci_bus
*bus
)
2401 unsigned int devfn
, pass
, max
= bus
->busn_res
.start
;
2402 struct pci_dev
*dev
;
2404 dev_dbg(&bus
->dev
, "scanning bus\n");
2406 /* Go find them, Rover! */
2407 for (devfn
= 0; devfn
< 0x100; devfn
+= 8)
2408 pci_scan_slot(bus
, devfn
);
2410 /* Reserve buses for SR-IOV capability. */
2411 max
+= pci_iov_bus_range(bus
);
2414 * After performing arch-dependent fixup of the bus, look behind
2415 * all PCI-to-PCI bridges on this bus.
2417 if (!bus
->is_added
) {
2418 dev_dbg(&bus
->dev
, "fixups for bus\n");
2419 pcibios_fixup_bus(bus
);
2423 for (pass
= 0; pass
< 2; pass
++)
2424 list_for_each_entry(dev
, &bus
->devices
, bus_list
) {
2425 if (pci_is_bridge(dev
))
2426 max
= pci_scan_bridge(bus
, dev
, max
, pass
);
2430 * Make sure a hotplug bridge has at least the minimum requested
2433 if (bus
->self
&& bus
->self
->is_hotplug_bridge
&& pci_hotplug_bus_size
) {
2434 if (max
- bus
->busn_res
.start
< pci_hotplug_bus_size
- 1)
2435 max
= bus
->busn_res
.start
+ pci_hotplug_bus_size
- 1;
2439 * We've scanned the bus and so we know all about what's on
2440 * the other side of any bridges that may be on this bus plus
2443 * Return how far we've got finding sub-buses.
2445 dev_dbg(&bus
->dev
, "bus scan returning with max=%02x\n", max
);
2448 EXPORT_SYMBOL_GPL(pci_scan_child_bus
);
2451 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
2452 * @bridge: Host bridge to set up.
2454 * Default empty implementation. Replace with an architecture-specific setup
2455 * routine, if necessary.
2457 int __weak
pcibios_root_bridge_prepare(struct pci_host_bridge
*bridge
)
2462 void __weak
pcibios_add_bus(struct pci_bus
*bus
)
2466 void __weak
pcibios_remove_bus(struct pci_bus
*bus
)
2470 struct pci_bus
*pci_create_root_bus(struct device
*parent
, int bus
,
2471 struct pci_ops
*ops
, void *sysdata
, struct list_head
*resources
)
2474 struct pci_host_bridge
*bridge
;
2476 bridge
= pci_alloc_host_bridge(0);
2480 bridge
->dev
.parent
= parent
;
2482 list_splice_init(resources
, &bridge
->windows
);
2483 bridge
->sysdata
= sysdata
;
2484 bridge
->busnr
= bus
;
2487 error
= pci_register_host_bridge(bridge
);
2497 EXPORT_SYMBOL_GPL(pci_create_root_bus
);
2499 int pci_bus_insert_busn_res(struct pci_bus
*b
, int bus
, int bus_max
)
2501 struct resource
*res
= &b
->busn_res
;
2502 struct resource
*parent_res
, *conflict
;
2506 res
->flags
= IORESOURCE_BUS
;
2508 if (!pci_is_root_bus(b
))
2509 parent_res
= &b
->parent
->busn_res
;
2511 parent_res
= get_pci_domain_busn_res(pci_domain_nr(b
));
2512 res
->flags
|= IORESOURCE_PCI_FIXED
;
2515 conflict
= request_resource_conflict(parent_res
, res
);
2518 dev_printk(KERN_DEBUG
, &b
->dev
,
2519 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
2520 res
, pci_is_root_bus(b
) ? "domain " : "",
2521 parent_res
, conflict
->name
, conflict
);
2523 return conflict
== NULL
;
2526 int pci_bus_update_busn_res_end(struct pci_bus
*b
, int bus_max
)
2528 struct resource
*res
= &b
->busn_res
;
2529 struct resource old_res
= *res
;
2530 resource_size_t size
;
2533 if (res
->start
> bus_max
)
2536 size
= bus_max
- res
->start
+ 1;
2537 ret
= adjust_resource(res
, res
->start
, size
);
2538 dev_printk(KERN_DEBUG
, &b
->dev
,
2539 "busn_res: %pR end %s updated to %02x\n",
2540 &old_res
, ret
? "can not be" : "is", bus_max
);
2542 if (!ret
&& !res
->parent
)
2543 pci_bus_insert_busn_res(b
, res
->start
, res
->end
);
2548 void pci_bus_release_busn_res(struct pci_bus
*b
)
2550 struct resource
*res
= &b
->busn_res
;
2553 if (!res
->flags
|| !res
->parent
)
2556 ret
= release_resource(res
);
2557 dev_printk(KERN_DEBUG
, &b
->dev
,
2558 "busn_res: %pR %s released\n",
2559 res
, ret
? "can not be" : "is");
2562 int pci_scan_root_bus_bridge(struct pci_host_bridge
*bridge
)
2564 struct resource_entry
*window
;
2572 resource_list_for_each_entry(window
, &bridge
->windows
)
2573 if (window
->res
->flags
& IORESOURCE_BUS
) {
2578 ret
= pci_register_host_bridge(bridge
);
2583 bus
= bridge
->busnr
;
2587 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2589 pci_bus_insert_busn_res(b
, bus
, 255);
2592 max
= pci_scan_child_bus(b
);
2595 pci_bus_update_busn_res_end(b
, max
);
2599 EXPORT_SYMBOL(pci_scan_root_bus_bridge
);
2601 struct pci_bus
*pci_scan_root_bus(struct device
*parent
, int bus
,
2602 struct pci_ops
*ops
, void *sysdata
, struct list_head
*resources
)
2604 struct resource_entry
*window
;
2609 resource_list_for_each_entry(window
, resources
)
2610 if (window
->res
->flags
& IORESOURCE_BUS
) {
2615 b
= pci_create_root_bus(parent
, bus
, ops
, sysdata
, resources
);
2621 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2623 pci_bus_insert_busn_res(b
, bus
, 255);
2626 max
= pci_scan_child_bus(b
);
2629 pci_bus_update_busn_res_end(b
, max
);
2633 EXPORT_SYMBOL(pci_scan_root_bus
);
2635 struct pci_bus
*pci_scan_bus(int bus
, struct pci_ops
*ops
,
2638 LIST_HEAD(resources
);
2641 pci_add_resource(&resources
, &ioport_resource
);
2642 pci_add_resource(&resources
, &iomem_resource
);
2643 pci_add_resource(&resources
, &busn_resource
);
2644 b
= pci_create_root_bus(NULL
, bus
, ops
, sysdata
, &resources
);
2646 pci_scan_child_bus(b
);
2648 pci_free_resource_list(&resources
);
2652 EXPORT_SYMBOL(pci_scan_bus
);
2655 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
2656 * @bridge: PCI bridge for the bus to scan
2658 * Scan a PCI bus and child buses for new devices, add them,
2659 * and enable them, resizing bridge mmio/io resource if necessary
2660 * and possible. The caller must ensure the child devices are already
2661 * removed for resizing to occur.
2663 * Returns the max number of subordinate bus discovered.
2665 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev
*bridge
)
2668 struct pci_bus
*bus
= bridge
->subordinate
;
2670 max
= pci_scan_child_bus(bus
);
2672 pci_assign_unassigned_bridge_resources(bridge
);
2674 pci_bus_add_devices(bus
);
2680 * pci_rescan_bus - scan a PCI bus for devices.
2681 * @bus: PCI bus to scan
2683 * Scan a PCI bus and child buses for new devices, adds them,
2686 * Returns the max number of subordinate bus discovered.
2688 unsigned int pci_rescan_bus(struct pci_bus
*bus
)
2692 max
= pci_scan_child_bus(bus
);
2693 pci_assign_unassigned_bus_resources(bus
);
2694 pci_bus_add_devices(bus
);
2698 EXPORT_SYMBOL_GPL(pci_rescan_bus
);
2701 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2702 * routines should always be executed under this mutex.
2704 static DEFINE_MUTEX(pci_rescan_remove_lock
);
2706 void pci_lock_rescan_remove(void)
2708 mutex_lock(&pci_rescan_remove_lock
);
2710 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove
);
2712 void pci_unlock_rescan_remove(void)
2714 mutex_unlock(&pci_rescan_remove_lock
);
2716 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove
);
2718 static int __init
pci_sort_bf_cmp(const struct device
*d_a
,
2719 const struct device
*d_b
)
2721 const struct pci_dev
*a
= to_pci_dev(d_a
);
2722 const struct pci_dev
*b
= to_pci_dev(d_b
);
2724 if (pci_domain_nr(a
->bus
) < pci_domain_nr(b
->bus
)) return -1;
2725 else if (pci_domain_nr(a
->bus
) > pci_domain_nr(b
->bus
)) return 1;
2727 if (a
->bus
->number
< b
->bus
->number
) return -1;
2728 else if (a
->bus
->number
> b
->bus
->number
) return 1;
2730 if (a
->devfn
< b
->devfn
) return -1;
2731 else if (a
->devfn
> b
->devfn
) return 1;
2736 void __init
pci_sort_breadthfirst(void)
2738 bus_sort_breadthfirst(&pci_bus_type
, &pci_sort_bf_cmp
);