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/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
13 #include <asm-generic/pci-bridge.h>
16 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
17 #define CARDBUS_RESERVE_BUSNR 3
19 struct resource busn_resource = {
23 .flags = IORESOURCE_BUS,
26 /* Ugh. Need to stop exporting this to modules. */
27 LIST_HEAD(pci_root_buses);
28 EXPORT_SYMBOL(pci_root_buses);
30 static LIST_HEAD(pci_domain_busn_res_list);
32 struct pci_domain_busn_res {
33 struct list_head list;
38 static struct resource *get_pci_domain_busn_res(int domain_nr)
40 struct pci_domain_busn_res *r;
42 list_for_each_entry(r, &pci_domain_busn_res_list, list)
43 if (r->domain_nr == domain_nr)
46 r = kzalloc(sizeof(*r), GFP_KERNEL);
50 r->domain_nr = domain_nr;
53 r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
55 list_add_tail(&r->list, &pci_domain_busn_res_list);
60 static int find_anything(struct device *dev, void *data)
66 * Some device drivers need know if pci is initiated.
67 * Basically, we think pci is not initiated when there
68 * is no device to be found on the pci_bus_type.
70 int no_pci_devices(void)
75 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
76 no_devices = (dev == NULL);
80 EXPORT_SYMBOL(no_pci_devices);
85 static void release_pcibus_dev(struct device *dev)
87 struct pci_bus *pci_bus = to_pci_bus(dev);
90 put_device(pci_bus->bridge);
91 pci_bus_remove_resources(pci_bus);
92 pci_release_bus_of_node(pci_bus);
96 static struct class pcibus_class = {
98 .dev_release = &release_pcibus_dev,
99 .dev_attrs = pcibus_dev_attrs,
102 static int __init pcibus_class_init(void)
104 return class_register(&pcibus_class);
106 postcore_initcall(pcibus_class_init);
108 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
110 u64 size = mask & maxbase; /* Find the significant bits */
114 /* Get the lowest of them to find the decode size, and
115 from that the extent. */
116 size = (size & ~(size-1)) - 1;
118 /* base == maxbase can be valid only if the BAR has
119 already been programmed with all 1s. */
120 if (base == maxbase && ((base | size) & mask) != mask)
126 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
131 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
132 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
133 flags |= IORESOURCE_IO;
137 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
138 flags |= IORESOURCE_MEM;
139 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
140 flags |= IORESOURCE_PREFETCH;
142 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
144 case PCI_BASE_ADDRESS_MEM_TYPE_32:
146 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
147 /* 1M mem BAR treated as 32-bit BAR */
149 case PCI_BASE_ADDRESS_MEM_TYPE_64:
150 flags |= IORESOURCE_MEM_64;
153 /* mem unknown type treated as 32-bit BAR */
160 * pci_read_base - read a PCI BAR
161 * @dev: the PCI device
162 * @type: type of the BAR
163 * @res: resource buffer to be filled in
164 * @pos: BAR position in the config space
166 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
168 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
169 struct resource *res, unsigned int pos)
173 struct pci_bus_region region;
174 bool bar_too_big = false, bar_disabled = false;
176 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
178 /* No printks while decoding is disabled! */
179 if (!dev->mmio_always_on) {
180 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
181 pci_write_config_word(dev, PCI_COMMAND,
182 orig_cmd & ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO));
185 res->name = pci_name(dev);
187 pci_read_config_dword(dev, pos, &l);
188 pci_write_config_dword(dev, pos, l | mask);
189 pci_read_config_dword(dev, pos, &sz);
190 pci_write_config_dword(dev, pos, l);
193 * All bits set in sz means the device isn't working properly.
194 * If the BAR isn't implemented, all bits must be 0. If it's a
195 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
198 if (!sz || sz == 0xffffffff)
202 * I don't know how l can have all bits set. Copied from old code.
203 * Maybe it fixes a bug on some ancient platform.
208 if (type == pci_bar_unknown) {
209 res->flags = decode_bar(dev, l);
210 res->flags |= IORESOURCE_SIZEALIGN;
211 if (res->flags & IORESOURCE_IO) {
212 l &= PCI_BASE_ADDRESS_IO_MASK;
213 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
215 l &= PCI_BASE_ADDRESS_MEM_MASK;
216 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
219 res->flags |= (l & IORESOURCE_ROM_ENABLE);
220 l &= PCI_ROM_ADDRESS_MASK;
221 mask = (u32)PCI_ROM_ADDRESS_MASK;
224 if (res->flags & IORESOURCE_MEM_64) {
227 u64 mask64 = mask | (u64)~0 << 32;
229 pci_read_config_dword(dev, pos + 4, &l);
230 pci_write_config_dword(dev, pos + 4, ~0);
231 pci_read_config_dword(dev, pos + 4, &sz);
232 pci_write_config_dword(dev, pos + 4, l);
234 l64 |= ((u64)l << 32);
235 sz64 |= ((u64)sz << 32);
237 sz64 = pci_size(l64, sz64, mask64);
242 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
247 if ((sizeof(resource_size_t) < 8) && l) {
248 /* Address above 32-bit boundary; disable the BAR */
249 pci_write_config_dword(dev, pos, 0);
250 pci_write_config_dword(dev, pos + 4, 0);
256 region.end = l64 + sz64;
259 sz = pci_size(l, sz, mask);
268 pcibios_bus_to_resource(dev, res, ®ion);
276 if (!dev->mmio_always_on)
277 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
280 dev_err(&dev->dev, "reg 0x%x: can't handle 64-bit BAR\n", pos);
281 if (res->flags && !bar_disabled)
282 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
284 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
287 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
289 unsigned int pos, reg;
291 for (pos = 0; pos < howmany; pos++) {
292 struct resource *res = &dev->resource[pos];
293 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
294 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
298 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
299 dev->rom_base_reg = rom;
300 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
301 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
302 IORESOURCE_SIZEALIGN;
303 __pci_read_base(dev, pci_bar_mem32, res, rom);
307 static void pci_read_bridge_io(struct pci_bus *child)
309 struct pci_dev *dev = child->self;
310 u8 io_base_lo, io_limit_lo;
311 unsigned long io_mask, io_granularity, base, limit;
312 struct pci_bus_region region;
313 struct resource *res;
315 io_mask = PCI_IO_RANGE_MASK;
316 io_granularity = 0x1000;
317 if (dev->io_window_1k) {
318 /* Support 1K I/O space granularity */
319 io_mask = PCI_IO_1K_RANGE_MASK;
320 io_granularity = 0x400;
323 res = child->resource[0];
324 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
325 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
326 base = (io_base_lo & io_mask) << 8;
327 limit = (io_limit_lo & io_mask) << 8;
329 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
330 u16 io_base_hi, io_limit_hi;
332 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
333 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
334 base |= ((unsigned long) io_base_hi << 16);
335 limit |= ((unsigned long) io_limit_hi << 16);
339 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
341 region.end = limit + io_granularity - 1;
342 pcibios_bus_to_resource(dev, res, ®ion);
343 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
347 static void pci_read_bridge_mmio(struct pci_bus *child)
349 struct pci_dev *dev = child->self;
350 u16 mem_base_lo, mem_limit_lo;
351 unsigned long base, limit;
352 struct pci_bus_region region;
353 struct resource *res;
355 res = child->resource[1];
356 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
357 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
358 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
359 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
361 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
363 region.end = limit + 0xfffff;
364 pcibios_bus_to_resource(dev, res, ®ion);
365 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
369 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
371 struct pci_dev *dev = child->self;
372 u16 mem_base_lo, mem_limit_lo;
373 unsigned long base, limit;
374 struct pci_bus_region region;
375 struct resource *res;
377 res = child->resource[2];
378 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
379 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
380 base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
381 limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
383 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
384 u32 mem_base_hi, mem_limit_hi;
386 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
387 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
390 * Some bridges set the base > limit by default, and some
391 * (broken) BIOSes do not initialize them. If we find
392 * this, just assume they are not being used.
394 if (mem_base_hi <= mem_limit_hi) {
395 #if BITS_PER_LONG == 64
396 base |= ((unsigned long) mem_base_hi) << 32;
397 limit |= ((unsigned long) mem_limit_hi) << 32;
399 if (mem_base_hi || mem_limit_hi) {
400 dev_err(&dev->dev, "can't handle 64-bit "
401 "address space for bridge\n");
408 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
409 IORESOURCE_MEM | IORESOURCE_PREFETCH;
410 if (res->flags & PCI_PREF_RANGE_TYPE_64)
411 res->flags |= IORESOURCE_MEM_64;
413 region.end = limit + 0xfffff;
414 pcibios_bus_to_resource(dev, res, ®ion);
415 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
419 void pci_read_bridge_bases(struct pci_bus *child)
421 struct pci_dev *dev = child->self;
422 struct resource *res;
425 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
428 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
430 dev->transparent ? " (subtractive decode)" : "");
432 pci_bus_remove_resources(child);
433 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
434 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
436 pci_read_bridge_io(child);
437 pci_read_bridge_mmio(child);
438 pci_read_bridge_mmio_pref(child);
440 if (dev->transparent) {
441 pci_bus_for_each_resource(child->parent, res, i) {
443 pci_bus_add_resource(child, res,
444 PCI_SUBTRACTIVE_DECODE);
445 dev_printk(KERN_DEBUG, &dev->dev,
446 " bridge window %pR (subtractive decode)\n",
453 static struct pci_bus * pci_alloc_bus(void)
457 b = kzalloc(sizeof(*b), GFP_KERNEL);
459 INIT_LIST_HEAD(&b->node);
460 INIT_LIST_HEAD(&b->children);
461 INIT_LIST_HEAD(&b->devices);
462 INIT_LIST_HEAD(&b->slots);
463 INIT_LIST_HEAD(&b->resources);
464 b->max_bus_speed = PCI_SPEED_UNKNOWN;
465 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
470 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
472 struct pci_host_bridge *bridge;
474 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
476 INIT_LIST_HEAD(&bridge->windows);
483 static unsigned char pcix_bus_speed[] = {
484 PCI_SPEED_UNKNOWN, /* 0 */
485 PCI_SPEED_66MHz_PCIX, /* 1 */
486 PCI_SPEED_100MHz_PCIX, /* 2 */
487 PCI_SPEED_133MHz_PCIX, /* 3 */
488 PCI_SPEED_UNKNOWN, /* 4 */
489 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
490 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
491 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
492 PCI_SPEED_UNKNOWN, /* 8 */
493 PCI_SPEED_66MHz_PCIX_266, /* 9 */
494 PCI_SPEED_100MHz_PCIX_266, /* A */
495 PCI_SPEED_133MHz_PCIX_266, /* B */
496 PCI_SPEED_UNKNOWN, /* C */
497 PCI_SPEED_66MHz_PCIX_533, /* D */
498 PCI_SPEED_100MHz_PCIX_533, /* E */
499 PCI_SPEED_133MHz_PCIX_533 /* F */
502 static unsigned char pcie_link_speed[] = {
503 PCI_SPEED_UNKNOWN, /* 0 */
504 PCIE_SPEED_2_5GT, /* 1 */
505 PCIE_SPEED_5_0GT, /* 2 */
506 PCIE_SPEED_8_0GT, /* 3 */
507 PCI_SPEED_UNKNOWN, /* 4 */
508 PCI_SPEED_UNKNOWN, /* 5 */
509 PCI_SPEED_UNKNOWN, /* 6 */
510 PCI_SPEED_UNKNOWN, /* 7 */
511 PCI_SPEED_UNKNOWN, /* 8 */
512 PCI_SPEED_UNKNOWN, /* 9 */
513 PCI_SPEED_UNKNOWN, /* A */
514 PCI_SPEED_UNKNOWN, /* B */
515 PCI_SPEED_UNKNOWN, /* C */
516 PCI_SPEED_UNKNOWN, /* D */
517 PCI_SPEED_UNKNOWN, /* E */
518 PCI_SPEED_UNKNOWN /* F */
521 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
523 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
525 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
527 static unsigned char agp_speeds[] = {
535 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
541 else if (agpstat & 2)
543 else if (agpstat & 1)
555 return agp_speeds[index];
559 static void pci_set_bus_speed(struct pci_bus *bus)
561 struct pci_dev *bridge = bus->self;
564 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
566 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
570 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
571 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
573 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
574 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
577 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
580 enum pci_bus_speed max;
582 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
585 if (status & PCI_X_SSTATUS_533MHZ) {
586 max = PCI_SPEED_133MHz_PCIX_533;
587 } else if (status & PCI_X_SSTATUS_266MHZ) {
588 max = PCI_SPEED_133MHz_PCIX_266;
589 } else if (status & PCI_X_SSTATUS_133MHZ) {
590 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) {
591 max = PCI_SPEED_133MHz_PCIX_ECC;
593 max = PCI_SPEED_133MHz_PCIX;
596 max = PCI_SPEED_66MHz_PCIX;
599 bus->max_bus_speed = max;
600 bus->cur_bus_speed = pcix_bus_speed[
601 (status & PCI_X_SSTATUS_FREQ) >> 6];
606 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
611 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
612 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
614 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
615 pcie_update_link_speed(bus, linksta);
620 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
621 struct pci_dev *bridge, int busnr)
623 struct pci_bus *child;
628 * Allocate a new bus, and inherit stuff from the parent..
630 child = pci_alloc_bus();
634 child->parent = parent;
635 child->ops = parent->ops;
636 child->sysdata = parent->sysdata;
637 child->bus_flags = parent->bus_flags;
639 /* initialize some portions of the bus device, but don't register it
640 * now as the parent is not properly set up yet.
642 child->dev.class = &pcibus_class;
643 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
646 * Set up the primary, secondary and subordinate
649 child->number = child->busn_res.start = busnr;
650 child->primary = parent->busn_res.start;
651 child->busn_res.end = 0xff;
654 child->dev.parent = parent->bridge;
658 child->self = bridge;
659 child->bridge = get_device(&bridge->dev);
660 child->dev.parent = child->bridge;
661 pci_set_bus_of_node(child);
662 pci_set_bus_speed(child);
664 /* Set up default resource pointers and names.. */
665 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
666 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
667 child->resource[i]->name = child->name;
669 bridge->subordinate = child;
672 ret = device_register(&child->dev);
675 pcibios_add_bus(child);
677 /* Create legacy_io and legacy_mem files for this bus */
678 pci_create_legacy_files(child);
683 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
685 struct pci_bus *child;
687 child = pci_alloc_child_bus(parent, dev, busnr);
689 down_write(&pci_bus_sem);
690 list_add_tail(&child->node, &parent->children);
691 up_write(&pci_bus_sem);
696 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
698 struct pci_bus *parent = child->parent;
700 /* Attempts to fix that up are really dangerous unless
701 we're going to re-assign all bus numbers. */
702 if (!pcibios_assign_all_busses())
705 while (parent->parent && parent->busn_res.end < max) {
706 parent->busn_res.end = max;
707 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
708 parent = parent->parent;
713 * If it's a bridge, configure it and scan the bus behind it.
714 * For CardBus bridges, we don't scan behind as the devices will
715 * be handled by the bridge driver itself.
717 * We need to process bridges in two passes -- first we scan those
718 * already configured by the BIOS and after we are done with all of
719 * them, we proceed to assigning numbers to the remaining buses in
720 * order to avoid overlaps between old and new bus numbers.
722 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
724 struct pci_bus *child;
725 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
728 u8 primary, secondary, subordinate;
731 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
732 primary = buses & 0xFF;
733 secondary = (buses >> 8) & 0xFF;
734 subordinate = (buses >> 16) & 0xFF;
736 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
737 secondary, subordinate, pass);
739 if (!primary && (primary != bus->number) && secondary && subordinate) {
740 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
741 primary = bus->number;
744 /* Check if setup is sensible at all */
746 (primary != bus->number || secondary <= bus->number ||
747 secondary > subordinate)) {
748 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
749 secondary, subordinate);
753 /* Disable MasterAbortMode during probing to avoid reporting
754 of bus errors (in some architectures) */
755 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
756 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
757 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
759 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
760 !is_cardbus && !broken) {
763 * Bus already configured by firmware, process it in the first
764 * pass and just note the configuration.
770 * If we already got to this bus through a different bridge,
771 * don't re-add it. This can happen with the i450NX chipset.
773 * However, we continue to descend down the hierarchy and
774 * scan remaining child buses.
776 child = pci_find_bus(pci_domain_nr(bus), secondary);
778 child = pci_add_new_bus(bus, dev, secondary);
781 child->primary = primary;
782 pci_bus_insert_busn_res(child, secondary, subordinate);
783 child->bridge_ctl = bctl;
786 cmax = pci_scan_child_bus(child);
789 if (child->busn_res.end > max)
790 max = child->busn_res.end;
793 * We need to assign a number to this bus which we always
794 * do in the second pass.
797 if (pcibios_assign_all_busses() || broken)
798 /* Temporarily disable forwarding of the
799 configuration cycles on all bridges in
800 this bus segment to avoid possible
801 conflicts in the second pass between two
802 bridges programmed with overlapping
804 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
810 pci_write_config_word(dev, PCI_STATUS, 0xffff);
812 /* Prevent assigning a bus number that already exists.
813 * This can happen when a bridge is hot-plugged, so in
814 * this case we only re-scan this bus. */
815 child = pci_find_bus(pci_domain_nr(bus), max+1);
817 child = pci_add_new_bus(bus, dev, ++max);
820 pci_bus_insert_busn_res(child, max, 0xff);
822 buses = (buses & 0xff000000)
823 | ((unsigned int)(child->primary) << 0)
824 | ((unsigned int)(child->busn_res.start) << 8)
825 | ((unsigned int)(child->busn_res.end) << 16);
828 * yenta.c forces a secondary latency timer of 176.
829 * Copy that behaviour here.
832 buses &= ~0xff000000;
833 buses |= CARDBUS_LATENCY_TIMER << 24;
837 * We need to blast all three values with a single write.
839 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
842 child->bridge_ctl = bctl;
844 * Adjust subordinate busnr in parent buses.
845 * We do this before scanning for children because
846 * some devices may not be detected if the bios
849 pci_fixup_parent_subordinate_busnr(child, max);
850 /* Now we can scan all subordinate buses... */
851 max = pci_scan_child_bus(child);
853 * now fix it up again since we have found
854 * the real value of max.
856 pci_fixup_parent_subordinate_busnr(child, max);
859 * For CardBus bridges, we leave 4 bus numbers
860 * as cards with a PCI-to-PCI bridge can be
863 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
864 struct pci_bus *parent = bus;
865 if (pci_find_bus(pci_domain_nr(bus),
868 while (parent->parent) {
869 if ((!pcibios_assign_all_busses()) &&
870 (parent->busn_res.end > max) &&
871 (parent->busn_res.end <= max+i)) {
874 parent = parent->parent;
878 * Often, there are two cardbus bridges
879 * -- try to leave one valid bus number
887 pci_fixup_parent_subordinate_busnr(child, max);
890 * Set the subordinate bus number to its real value.
892 pci_bus_update_busn_res_end(child, max);
893 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
897 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
898 pci_domain_nr(bus), child->number);
900 /* Has only triggered on CardBus, fixup is in yenta_socket */
901 while (bus->parent) {
902 if ((child->busn_res.end > bus->busn_res.end) ||
903 (child->number > bus->busn_res.end) ||
904 (child->number < bus->number) ||
905 (child->busn_res.end < bus->number)) {
906 dev_info(&child->dev, "%pR %s "
907 "hidden behind%s bridge %s %pR\n",
909 (bus->number > child->busn_res.end &&
910 bus->busn_res.end < child->number) ?
911 "wholly" : "partially",
912 bus->self->transparent ? " transparent" : "",
920 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
926 * Read interrupt line and base address registers.
927 * The architecture-dependent code can tweak these, of course.
929 static void pci_read_irq(struct pci_dev *dev)
933 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
936 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
940 void set_pcie_port_type(struct pci_dev *pdev)
945 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
949 pdev->pcie_cap = pos;
950 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
951 pdev->pcie_flags_reg = reg16;
952 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
953 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
956 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
960 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
961 if (reg32 & PCI_EXP_SLTCAP_HPC)
962 pdev->is_hotplug_bridge = 1;
965 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
968 * pci_setup_device - fill in class and map information of a device
969 * @dev: the device structure to fill
971 * Initialize the device structure with information about the device's
972 * vendor,class,memory and IO-space addresses,IRQ lines etc.
973 * Called at initialisation of the PCI subsystem and by CardBus services.
974 * Returns 0 on success and negative if unknown type of device (not normal,
975 * bridge or CardBus).
977 int pci_setup_device(struct pci_dev *dev)
981 struct pci_slot *slot;
983 struct pci_bus_region region;
984 struct resource *res;
986 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
989 dev->sysdata = dev->bus->sysdata;
990 dev->dev.parent = dev->bus->bridge;
991 dev->dev.bus = &pci_bus_type;
992 dev->hdr_type = hdr_type & 0x7f;
993 dev->multifunction = !!(hdr_type & 0x80);
994 dev->error_state = pci_channel_io_normal;
995 set_pcie_port_type(dev);
997 list_for_each_entry(slot, &dev->bus->slots, list)
998 if (PCI_SLOT(dev->devfn) == slot->number)
1001 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1002 set this higher, assuming the system even supports it. */
1003 dev->dma_mask = 0xffffffff;
1005 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1006 dev->bus->number, PCI_SLOT(dev->devfn),
1007 PCI_FUNC(dev->devfn));
1009 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1010 dev->revision = class & 0xff;
1011 dev->class = class >> 8; /* upper 3 bytes */
1013 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1014 dev->vendor, dev->device, dev->hdr_type, dev->class);
1016 /* need to have dev->class ready */
1017 dev->cfg_size = pci_cfg_space_size(dev);
1019 /* "Unknown power state" */
1020 dev->current_state = PCI_UNKNOWN;
1022 /* Early fixups, before probing the BARs */
1023 pci_fixup_device(pci_fixup_early, dev);
1024 /* device class may be changed after fixup */
1025 class = dev->class >> 8;
1027 switch (dev->hdr_type) { /* header type */
1028 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1029 if (class == PCI_CLASS_BRIDGE_PCI)
1032 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1033 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1034 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1037 * Do the ugly legacy mode stuff here rather than broken chip
1038 * quirk code. Legacy mode ATA controllers have fixed
1039 * addresses. These are not always echoed in BAR0-3, and
1040 * BAR0-3 in a few cases contain junk!
1042 if (class == PCI_CLASS_STORAGE_IDE) {
1044 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1045 if ((progif & 1) == 0) {
1046 region.start = 0x1F0;
1048 res = &dev->resource[0];
1049 res->flags = LEGACY_IO_RESOURCE;
1050 pcibios_bus_to_resource(dev, res, ®ion);
1051 region.start = 0x3F6;
1053 res = &dev->resource[1];
1054 res->flags = LEGACY_IO_RESOURCE;
1055 pcibios_bus_to_resource(dev, res, ®ion);
1057 if ((progif & 4) == 0) {
1058 region.start = 0x170;
1060 res = &dev->resource[2];
1061 res->flags = LEGACY_IO_RESOURCE;
1062 pcibios_bus_to_resource(dev, res, ®ion);
1063 region.start = 0x376;
1065 res = &dev->resource[3];
1066 res->flags = LEGACY_IO_RESOURCE;
1067 pcibios_bus_to_resource(dev, res, ®ion);
1072 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1073 if (class != PCI_CLASS_BRIDGE_PCI)
1075 /* The PCI-to-PCI bridge spec requires that subtractive
1076 decoding (i.e. transparent) bridge must have programming
1077 interface code of 0x01. */
1079 dev->transparent = ((dev->class & 0xff) == 1);
1080 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1081 set_pcie_hotplug_bridge(dev);
1082 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1084 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1085 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1089 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1090 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1093 pci_read_bases(dev, 1, 0);
1094 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1095 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1098 default: /* unknown header */
1099 dev_err(&dev->dev, "unknown header type %02x, "
1100 "ignoring device\n", dev->hdr_type);
1104 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header "
1105 "type %02x)\n", dev->class, dev->hdr_type);
1106 dev->class = PCI_CLASS_NOT_DEFINED;
1109 /* We found a fine healthy device, go go go... */
1113 static void pci_release_capabilities(struct pci_dev *dev)
1115 pci_vpd_release(dev);
1116 pci_iov_release(dev);
1117 pci_free_cap_save_buffers(dev);
1121 * pci_release_dev - free a pci device structure when all users of it are finished.
1122 * @dev: device that's been disconnected
1124 * Will be called only by the device core when all users of this pci device are
1127 static void pci_release_dev(struct device *dev)
1129 struct pci_dev *pci_dev;
1131 pci_dev = to_pci_dev(dev);
1132 pci_release_capabilities(pci_dev);
1133 pci_release_of_node(pci_dev);
1138 * pci_cfg_space_size - get the configuration space size of the PCI device.
1141 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1142 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1143 * access it. Maybe we don't have a way to generate extended config space
1144 * accesses, or the device is behind a reverse Express bridge. So we try
1145 * reading the dword at 0x100 which must either be 0 or a valid extended
1146 * capability header.
1148 int pci_cfg_space_size_ext(struct pci_dev *dev)
1151 int pos = PCI_CFG_SPACE_SIZE;
1153 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1155 if (status == 0xffffffff)
1158 return PCI_CFG_SPACE_EXP_SIZE;
1161 return PCI_CFG_SPACE_SIZE;
1164 int pci_cfg_space_size(struct pci_dev *dev)
1170 class = dev->class >> 8;
1171 if (class == PCI_CLASS_BRIDGE_HOST)
1172 return pci_cfg_space_size_ext(dev);
1174 if (!pci_is_pcie(dev)) {
1175 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1179 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1180 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1184 return pci_cfg_space_size_ext(dev);
1187 return PCI_CFG_SPACE_SIZE;
1190 static void pci_release_bus_bridge_dev(struct device *dev)
1192 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
1194 if (bridge->release_fn)
1195 bridge->release_fn(bridge);
1197 pci_free_resource_list(&bridge->windows);
1202 struct pci_dev *alloc_pci_dev(void)
1204 struct pci_dev *dev;
1206 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1210 INIT_LIST_HEAD(&dev->bus_list);
1211 dev->dev.type = &pci_dev_type;
1215 EXPORT_SYMBOL(alloc_pci_dev);
1217 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1222 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1225 /* some broken boards return 0 or ~0 if a slot is empty: */
1226 if (*l == 0xffffffff || *l == 0x00000000 ||
1227 *l == 0x0000ffff || *l == 0xffff0000)
1230 /* Configuration request Retry Status */
1231 while (*l == 0xffff0001) {
1237 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1239 /* Card hasn't responded in 60 seconds? Must be stuck. */
1240 if (delay > crs_timeout) {
1241 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1242 "responding\n", pci_domain_nr(bus),
1243 bus->number, PCI_SLOT(devfn),
1251 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1254 * Read the config data for a PCI device, sanity-check it
1255 * and fill in the dev structure...
1257 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1259 struct pci_dev *dev;
1262 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1265 dev = alloc_pci_dev();
1271 dev->vendor = l & 0xffff;
1272 dev->device = (l >> 16) & 0xffff;
1274 pci_set_of_node(dev);
1276 if (pci_setup_device(dev)) {
1284 static void pci_init_capabilities(struct pci_dev *dev)
1286 /* MSI/MSI-X list */
1287 pci_msi_init_pci_dev(dev);
1289 /* Buffers for saving PCIe and PCI-X capabilities */
1290 pci_allocate_cap_save_buffers(dev);
1292 /* Power Management */
1295 /* Vital Product Data */
1296 pci_vpd_pci22_init(dev);
1298 /* Alternative Routing-ID Forwarding */
1299 pci_configure_ari(dev);
1301 /* Single Root I/O Virtualization */
1304 /* Enable ACS P2P upstream forwarding */
1305 pci_enable_acs(dev);
1308 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1312 device_initialize(&dev->dev);
1313 dev->dev.release = pci_release_dev;
1315 set_dev_node(&dev->dev, pcibus_to_node(bus));
1316 dev->dev.dma_mask = &dev->dma_mask;
1317 dev->dev.dma_parms = &dev->dma_parms;
1318 dev->dev.coherent_dma_mask = 0xffffffffull;
1320 pci_set_dma_max_seg_size(dev, 65536);
1321 pci_set_dma_seg_boundary(dev, 0xffffffff);
1323 /* Fix up broken headers */
1324 pci_fixup_device(pci_fixup_header, dev);
1326 /* moved out from quirk header fixup code */
1327 pci_reassigndev_resource_alignment(dev);
1329 /* Clear the state_saved flag. */
1330 dev->state_saved = false;
1332 /* Initialize various capabilities */
1333 pci_init_capabilities(dev);
1336 * Add the device to our list of discovered devices
1337 * and the bus list for fixup functions, etc.
1339 down_write(&pci_bus_sem);
1340 list_add_tail(&dev->bus_list, &bus->devices);
1341 up_write(&pci_bus_sem);
1343 ret = pcibios_add_device(dev);
1346 /* Notifier could use PCI capabilities */
1347 dev->match_driver = false;
1348 ret = device_add(&dev->dev);
1351 pci_proc_attach_device(dev);
1354 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1356 struct pci_dev *dev;
1358 dev = pci_get_slot(bus, devfn);
1364 dev = pci_scan_device(bus, devfn);
1368 pci_device_add(dev, bus);
1372 EXPORT_SYMBOL(pci_scan_single_device);
1374 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1380 if (pci_ari_enabled(bus)) {
1383 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1387 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1388 next_fn = PCI_ARI_CAP_NFN(cap);
1390 return 0; /* protect against malformed list */
1395 /* dev may be NULL for non-contiguous multifunction devices */
1396 if (!dev || dev->multifunction)
1397 return (fn + 1) % 8;
1402 static int only_one_child(struct pci_bus *bus)
1404 struct pci_dev *parent = bus->self;
1406 if (!parent || !pci_is_pcie(parent))
1408 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1410 if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
1411 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1417 * pci_scan_slot - scan a PCI slot on a bus for devices.
1418 * @bus: PCI bus to scan
1419 * @devfn: slot number to scan (must have zero function.)
1421 * Scan a PCI slot on the specified PCI bus for devices, adding
1422 * discovered devices to the @bus->devices list. New devices
1423 * will not have is_added set.
1425 * Returns the number of new devices found.
1427 int pci_scan_slot(struct pci_bus *bus, int devfn)
1429 unsigned fn, nr = 0;
1430 struct pci_dev *dev;
1432 if (only_one_child(bus) && (devfn > 0))
1433 return 0; /* Already scanned the entire slot */
1435 dev = pci_scan_single_device(bus, devfn);
1441 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1442 dev = pci_scan_single_device(bus, devfn + fn);
1446 dev->multifunction = 1;
1450 /* only one slot has pcie device */
1451 if (bus->self && nr)
1452 pcie_aspm_init_link_state(bus->self);
1457 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1461 if (!pci_is_pcie(dev))
1464 /* For PCIE hotplug enabled slots not connected directly to a
1465 * PCI-E root port, there can be problems when hotplugging
1466 * devices. This is due to the possibility of hotplugging a
1467 * device into the fabric with a smaller MPS that the devices
1468 * currently running have configured. Modifying the MPS on the
1469 * running devices could cause a fatal bus error due to an
1470 * incoming frame being larger than the newly configured MPS.
1471 * To work around this, the MPS for the entire fabric must be
1472 * set to the minimum size. Any devices hotplugged into this
1473 * fabric will have the minimum MPS set. If the PCI hotplug
1474 * slot is directly connected to the root port and there are not
1475 * other devices on the fabric (which seems to be the most
1476 * common case), then this is not an issue and MPS discovery
1477 * will occur as normal.
1479 if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) ||
1481 pci_pcie_type(dev->bus->self) != PCI_EXP_TYPE_ROOT_PORT)))
1484 if (*smpss > dev->pcie_mpss)
1485 *smpss = dev->pcie_mpss;
1490 static void pcie_write_mps(struct pci_dev *dev, int mps)
1494 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1495 mps = 128 << dev->pcie_mpss;
1497 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1499 /* For "Performance", the assumption is made that
1500 * downstream communication will never be larger than
1501 * the MRRS. So, the MPS only needs to be configured
1502 * for the upstream communication. This being the case,
1503 * walk from the top down and set the MPS of the child
1504 * to that of the parent bus.
1506 * Configure the device MPS with the smaller of the
1507 * device MPSS or the bridge MPS (which is assumed to be
1508 * properly configured at this point to the largest
1509 * allowable MPS based on its parent bus).
1511 mps = min(mps, pcie_get_mps(dev->bus->self));
1514 rc = pcie_set_mps(dev, mps);
1516 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1519 static void pcie_write_mrrs(struct pci_dev *dev)
1523 /* In the "safe" case, do not configure the MRRS. There appear to be
1524 * issues with setting MRRS to 0 on a number of devices.
1526 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1529 /* For Max performance, the MRRS must be set to the largest supported
1530 * value. However, it cannot be configured larger than the MPS the
1531 * device or the bus can support. This should already be properly
1532 * configured by a prior call to pcie_write_mps.
1534 mrrs = pcie_get_mps(dev);
1536 /* MRRS is a R/W register. Invalid values can be written, but a
1537 * subsequent read will verify if the value is acceptable or not.
1538 * If the MRRS value provided is not acceptable (e.g., too large),
1539 * shrink the value until it is acceptable to the HW.
1541 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1542 rc = pcie_set_readrq(dev, mrrs);
1546 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1551 dev_err(&dev->dev, "MRRS was unable to be configured with a "
1552 "safe value. If problems are experienced, try running "
1553 "with pci=pcie_bus_safe.\n");
1556 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1560 if (!pci_is_pcie(dev))
1563 mps = 128 << *(u8 *)data;
1564 orig_mps = pcie_get_mps(dev);
1566 pcie_write_mps(dev, mps);
1567 pcie_write_mrrs(dev);
1569 dev_info(&dev->dev, "PCI-E Max Payload Size set to %4d/%4d (was %4d), "
1570 "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss,
1571 orig_mps, pcie_get_readrq(dev));
1576 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1577 * parents then children fashion. If this changes, then this code will not
1580 void pcie_bus_configure_settings(struct pci_bus *bus, u8 mpss)
1584 if (!pci_is_pcie(bus->self))
1587 if (pcie_bus_config == PCIE_BUS_TUNE_OFF)
1590 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1591 * to be aware to the MPS of the destination. To work around this,
1592 * simply force the MPS of the entire system to the smallest possible.
1594 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1597 if (pcie_bus_config == PCIE_BUS_SAFE) {
1600 pcie_find_smpss(bus->self, &smpss);
1601 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1604 pcie_bus_configure_set(bus->self, &smpss);
1605 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1607 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1609 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1611 unsigned int devfn, pass, max = bus->busn_res.start;
1612 struct pci_dev *dev;
1614 dev_dbg(&bus->dev, "scanning bus\n");
1616 /* Go find them, Rover! */
1617 for (devfn = 0; devfn < 0x100; devfn += 8)
1618 pci_scan_slot(bus, devfn);
1620 /* Reserve buses for SR-IOV capability. */
1621 max += pci_iov_bus_range(bus);
1624 * After performing arch-dependent fixup of the bus, look behind
1625 * all PCI-to-PCI bridges on this bus.
1627 if (!bus->is_added) {
1628 dev_dbg(&bus->dev, "fixups for bus\n");
1629 pcibios_fixup_bus(bus);
1633 for (pass=0; pass < 2; pass++)
1634 list_for_each_entry(dev, &bus->devices, bus_list) {
1635 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1636 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1637 max = pci_scan_bridge(bus, dev, max, pass);
1641 * We've scanned the bus and so we know all about what's on
1642 * the other side of any bridges that may be on this bus plus
1645 * Return how far we've got finding sub-buses.
1647 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1652 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
1653 * @bridge: Host bridge to set up.
1655 * Default empty implementation. Replace with an architecture-specific setup
1656 * routine, if necessary.
1658 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1663 void __weak pcibios_add_bus(struct pci_bus *bus)
1667 void __weak pcibios_remove_bus(struct pci_bus *bus)
1671 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
1672 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1675 struct pci_host_bridge *bridge;
1676 struct pci_bus *b, *b2;
1677 struct pci_host_bridge_window *window, *n;
1678 struct resource *res;
1679 resource_size_t offset;
1683 b = pci_alloc_bus();
1687 b->sysdata = sysdata;
1689 b->number = b->busn_res.start = bus;
1690 b2 = pci_find_bus(pci_domain_nr(b), bus);
1692 /* If we already got to this bus through a different bridge, ignore it */
1693 dev_dbg(&b2->dev, "bus already known\n");
1697 bridge = pci_alloc_host_bridge(b);
1701 bridge->dev.parent = parent;
1702 bridge->dev.release = pci_release_bus_bridge_dev;
1703 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1704 error = pcibios_root_bridge_prepare(bridge);
1706 goto bridge_dev_reg_err;
1708 error = device_register(&bridge->dev);
1710 goto bridge_dev_reg_err;
1711 b->bridge = get_device(&bridge->dev);
1712 device_enable_async_suspend(b->bridge);
1713 pci_set_bus_of_node(b);
1716 set_dev_node(b->bridge, pcibus_to_node(b));
1718 b->dev.class = &pcibus_class;
1719 b->dev.parent = b->bridge;
1720 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1721 error = device_register(&b->dev);
1723 goto class_dev_reg_err;
1727 /* Create legacy_io and legacy_mem files for this bus */
1728 pci_create_legacy_files(b);
1731 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
1733 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
1735 /* Add initial resources to the bus */
1736 list_for_each_entry_safe(window, n, resources, list) {
1737 list_move_tail(&window->list, &bridge->windows);
1739 offset = window->offset;
1740 if (res->flags & IORESOURCE_BUS)
1741 pci_bus_insert_busn_res(b, bus, res->end);
1743 pci_bus_add_resource(b, res, 0);
1745 if (resource_type(res) == IORESOURCE_IO)
1746 fmt = " (bus address [%#06llx-%#06llx])";
1748 fmt = " (bus address [%#010llx-%#010llx])";
1749 snprintf(bus_addr, sizeof(bus_addr), fmt,
1750 (unsigned long long) (res->start - offset),
1751 (unsigned long long) (res->end - offset));
1754 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
1757 down_write(&pci_bus_sem);
1758 list_add_tail(&b->node, &pci_root_buses);
1759 up_write(&pci_bus_sem);
1764 put_device(&bridge->dev);
1765 device_unregister(&bridge->dev);
1773 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
1775 struct resource *res = &b->busn_res;
1776 struct resource *parent_res, *conflict;
1780 res->flags = IORESOURCE_BUS;
1782 if (!pci_is_root_bus(b))
1783 parent_res = &b->parent->busn_res;
1785 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
1786 res->flags |= IORESOURCE_PCI_FIXED;
1789 conflict = insert_resource_conflict(parent_res, res);
1792 dev_printk(KERN_DEBUG, &b->dev,
1793 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
1794 res, pci_is_root_bus(b) ? "domain " : "",
1795 parent_res, conflict->name, conflict);
1797 return conflict == NULL;
1800 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
1802 struct resource *res = &b->busn_res;
1803 struct resource old_res = *res;
1804 resource_size_t size;
1807 if (res->start > bus_max)
1810 size = bus_max - res->start + 1;
1811 ret = adjust_resource(res, res->start, size);
1812 dev_printk(KERN_DEBUG, &b->dev,
1813 "busn_res: %pR end %s updated to %02x\n",
1814 &old_res, ret ? "can not be" : "is", bus_max);
1816 if (!ret && !res->parent)
1817 pci_bus_insert_busn_res(b, res->start, res->end);
1822 void pci_bus_release_busn_res(struct pci_bus *b)
1824 struct resource *res = &b->busn_res;
1827 if (!res->flags || !res->parent)
1830 ret = release_resource(res);
1831 dev_printk(KERN_DEBUG, &b->dev,
1832 "busn_res: %pR %s released\n",
1833 res, ret ? "can not be" : "is");
1836 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
1837 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1839 struct pci_host_bridge_window *window;
1844 list_for_each_entry(window, resources, list)
1845 if (window->res->flags & IORESOURCE_BUS) {
1850 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
1856 "No busn resource found for root bus, will use [bus %02x-ff]\n",
1858 pci_bus_insert_busn_res(b, bus, 255);
1861 max = pci_scan_child_bus(b);
1864 pci_bus_update_busn_res_end(b, max);
1866 pci_bus_add_devices(b);
1869 EXPORT_SYMBOL(pci_scan_root_bus);
1871 /* Deprecated; use pci_scan_root_bus() instead */
1872 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1873 int bus, struct pci_ops *ops, void *sysdata)
1875 LIST_HEAD(resources);
1878 pci_add_resource(&resources, &ioport_resource);
1879 pci_add_resource(&resources, &iomem_resource);
1880 pci_add_resource(&resources, &busn_resource);
1881 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
1883 pci_scan_child_bus(b);
1885 pci_free_resource_list(&resources);
1888 EXPORT_SYMBOL(pci_scan_bus_parented);
1890 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
1893 LIST_HEAD(resources);
1896 pci_add_resource(&resources, &ioport_resource);
1897 pci_add_resource(&resources, &iomem_resource);
1898 pci_add_resource(&resources, &busn_resource);
1899 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
1901 pci_scan_child_bus(b);
1902 pci_bus_add_devices(b);
1904 pci_free_resource_list(&resources);
1908 EXPORT_SYMBOL(pci_scan_bus);
1911 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
1912 * @bridge: PCI bridge for the bus to scan
1914 * Scan a PCI bus and child buses for new devices, add them,
1915 * and enable them, resizing bridge mmio/io resource if necessary
1916 * and possible. The caller must ensure the child devices are already
1917 * removed for resizing to occur.
1919 * Returns the max number of subordinate bus discovered.
1921 unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
1924 struct pci_bus *bus = bridge->subordinate;
1926 max = pci_scan_child_bus(bus);
1928 pci_assign_unassigned_bridge_resources(bridge);
1930 pci_bus_add_devices(bus);
1936 * pci_rescan_bus - scan a PCI bus for devices.
1937 * @bus: PCI bus to scan
1939 * Scan a PCI bus and child buses for new devices, adds them,
1942 * Returns the max number of subordinate bus discovered.
1944 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1948 max = pci_scan_child_bus(bus);
1949 pci_assign_unassigned_bus_resources(bus);
1950 pci_enable_bridges(bus);
1951 pci_bus_add_devices(bus);
1955 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1957 EXPORT_SYMBOL(pci_add_new_bus);
1958 EXPORT_SYMBOL(pci_scan_slot);
1959 EXPORT_SYMBOL(pci_scan_bridge);
1960 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1962 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1964 const struct pci_dev *a = to_pci_dev(d_a);
1965 const struct pci_dev *b = to_pci_dev(d_b);
1967 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1968 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1970 if (a->bus->number < b->bus->number) return -1;
1971 else if (a->bus->number > b->bus->number) return 1;
1973 if (a->devfn < b->devfn) return -1;
1974 else if (a->devfn > b->devfn) return 1;
1979 void __init pci_sort_breadthfirst(void)
1981 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);