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 sz &= PCI_BASE_ADDRESS_IO_MASK;
214 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
216 l &= PCI_BASE_ADDRESS_MEM_MASK;
217 sz &= PCI_BASE_ADDRESS_MEM_MASK;
218 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
221 res->flags |= (l & IORESOURCE_ROM_ENABLE);
222 l &= PCI_ROM_ADDRESS_MASK;
223 sz &= PCI_ROM_ADDRESS_MASK;
224 mask = (u32)PCI_ROM_ADDRESS_MASK;
227 if (res->flags & IORESOURCE_MEM_64) {
230 u64 mask64 = mask | (u64)~0 << 32;
232 pci_read_config_dword(dev, pos + 4, &l);
233 pci_write_config_dword(dev, pos + 4, ~0);
234 pci_read_config_dword(dev, pos + 4, &sz);
235 pci_write_config_dword(dev, pos + 4, l);
237 l64 |= ((u64)l << 32);
238 sz64 |= ((u64)sz << 32);
240 sz64 = pci_size(l64, sz64, mask64);
245 if ((sizeof(resource_size_t) < 8) && (sz64 > 0x100000000ULL)) {
250 if ((sizeof(resource_size_t) < 8) && l) {
251 /* Address above 32-bit boundary; disable the BAR */
252 pci_write_config_dword(dev, pos, 0);
253 pci_write_config_dword(dev, pos + 4, 0);
256 pcibios_bus_to_resource(dev, res, ®ion);
260 region.end = l64 + sz64;
261 pcibios_bus_to_resource(dev, res, ®ion);
264 sz = pci_size(l, sz, mask);
271 pcibios_bus_to_resource(dev, res, ®ion);
280 if (!dev->mmio_always_on)
281 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
284 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", pos);
285 if (res->flags && !bar_disabled)
286 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
288 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
291 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
293 unsigned int pos, reg;
295 for (pos = 0; pos < howmany; pos++) {
296 struct resource *res = &dev->resource[pos];
297 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
298 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
302 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
303 dev->rom_base_reg = rom;
304 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
305 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
306 IORESOURCE_SIZEALIGN;
307 __pci_read_base(dev, pci_bar_mem32, res, rom);
311 static void pci_read_bridge_io(struct pci_bus *child)
313 struct pci_dev *dev = child->self;
314 u8 io_base_lo, io_limit_lo;
315 unsigned long io_mask, io_granularity, base, limit;
316 struct pci_bus_region region;
317 struct resource *res;
319 io_mask = PCI_IO_RANGE_MASK;
320 io_granularity = 0x1000;
321 if (dev->io_window_1k) {
322 /* Support 1K I/O space granularity */
323 io_mask = PCI_IO_1K_RANGE_MASK;
324 io_granularity = 0x400;
327 res = child->resource[0];
328 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
329 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
330 base = (io_base_lo & io_mask) << 8;
331 limit = (io_limit_lo & io_mask) << 8;
333 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
334 u16 io_base_hi, io_limit_hi;
336 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
337 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
338 base |= ((unsigned long) io_base_hi << 16);
339 limit |= ((unsigned long) io_limit_hi << 16);
343 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
345 region.end = limit + io_granularity - 1;
346 pcibios_bus_to_resource(dev, res, ®ion);
347 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
351 static void pci_read_bridge_mmio(struct pci_bus *child)
353 struct pci_dev *dev = child->self;
354 u16 mem_base_lo, mem_limit_lo;
355 unsigned long base, limit;
356 struct pci_bus_region region;
357 struct resource *res;
359 res = child->resource[1];
360 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
361 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
362 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
363 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
365 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
367 region.end = limit + 0xfffff;
368 pcibios_bus_to_resource(dev, res, ®ion);
369 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
373 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
375 struct pci_dev *dev = child->self;
376 u16 mem_base_lo, mem_limit_lo;
377 unsigned long base, limit;
378 struct pci_bus_region region;
379 struct resource *res;
381 res = child->resource[2];
382 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
383 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
384 base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
385 limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
387 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
388 u32 mem_base_hi, mem_limit_hi;
390 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
391 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
394 * Some bridges set the base > limit by default, and some
395 * (broken) BIOSes do not initialize them. If we find
396 * this, just assume they are not being used.
398 if (mem_base_hi <= mem_limit_hi) {
399 #if BITS_PER_LONG == 64
400 base |= ((unsigned long) mem_base_hi) << 32;
401 limit |= ((unsigned long) mem_limit_hi) << 32;
403 if (mem_base_hi || mem_limit_hi) {
404 dev_err(&dev->dev, "can't handle 64-bit "
405 "address space for bridge\n");
412 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
413 IORESOURCE_MEM | IORESOURCE_PREFETCH;
414 if (res->flags & PCI_PREF_RANGE_TYPE_64)
415 res->flags |= IORESOURCE_MEM_64;
417 region.end = limit + 0xfffff;
418 pcibios_bus_to_resource(dev, res, ®ion);
419 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
423 void pci_read_bridge_bases(struct pci_bus *child)
425 struct pci_dev *dev = child->self;
426 struct resource *res;
429 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
432 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
434 dev->transparent ? " (subtractive decode)" : "");
436 pci_bus_remove_resources(child);
437 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
438 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
440 pci_read_bridge_io(child);
441 pci_read_bridge_mmio(child);
442 pci_read_bridge_mmio_pref(child);
444 if (dev->transparent) {
445 pci_bus_for_each_resource(child->parent, res, i) {
447 pci_bus_add_resource(child, res,
448 PCI_SUBTRACTIVE_DECODE);
449 dev_printk(KERN_DEBUG, &dev->dev,
450 " bridge window %pR (subtractive decode)\n",
457 static struct pci_bus * pci_alloc_bus(void)
461 b = kzalloc(sizeof(*b), GFP_KERNEL);
463 INIT_LIST_HEAD(&b->node);
464 INIT_LIST_HEAD(&b->children);
465 INIT_LIST_HEAD(&b->devices);
466 INIT_LIST_HEAD(&b->slots);
467 INIT_LIST_HEAD(&b->resources);
468 b->max_bus_speed = PCI_SPEED_UNKNOWN;
469 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
474 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
476 struct pci_host_bridge *bridge;
478 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
480 INIT_LIST_HEAD(&bridge->windows);
487 static unsigned char pcix_bus_speed[] = {
488 PCI_SPEED_UNKNOWN, /* 0 */
489 PCI_SPEED_66MHz_PCIX, /* 1 */
490 PCI_SPEED_100MHz_PCIX, /* 2 */
491 PCI_SPEED_133MHz_PCIX, /* 3 */
492 PCI_SPEED_UNKNOWN, /* 4 */
493 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
494 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
495 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
496 PCI_SPEED_UNKNOWN, /* 8 */
497 PCI_SPEED_66MHz_PCIX_266, /* 9 */
498 PCI_SPEED_100MHz_PCIX_266, /* A */
499 PCI_SPEED_133MHz_PCIX_266, /* B */
500 PCI_SPEED_UNKNOWN, /* C */
501 PCI_SPEED_66MHz_PCIX_533, /* D */
502 PCI_SPEED_100MHz_PCIX_533, /* E */
503 PCI_SPEED_133MHz_PCIX_533 /* F */
506 static unsigned char pcie_link_speed[] = {
507 PCI_SPEED_UNKNOWN, /* 0 */
508 PCIE_SPEED_2_5GT, /* 1 */
509 PCIE_SPEED_5_0GT, /* 2 */
510 PCIE_SPEED_8_0GT, /* 3 */
511 PCI_SPEED_UNKNOWN, /* 4 */
512 PCI_SPEED_UNKNOWN, /* 5 */
513 PCI_SPEED_UNKNOWN, /* 6 */
514 PCI_SPEED_UNKNOWN, /* 7 */
515 PCI_SPEED_UNKNOWN, /* 8 */
516 PCI_SPEED_UNKNOWN, /* 9 */
517 PCI_SPEED_UNKNOWN, /* A */
518 PCI_SPEED_UNKNOWN, /* B */
519 PCI_SPEED_UNKNOWN, /* C */
520 PCI_SPEED_UNKNOWN, /* D */
521 PCI_SPEED_UNKNOWN, /* E */
522 PCI_SPEED_UNKNOWN /* F */
525 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
527 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
529 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
531 static unsigned char agp_speeds[] = {
539 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
545 else if (agpstat & 2)
547 else if (agpstat & 1)
559 return agp_speeds[index];
563 static void pci_set_bus_speed(struct pci_bus *bus)
565 struct pci_dev *bridge = bus->self;
568 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
570 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
574 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
575 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
577 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
578 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
581 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
584 enum pci_bus_speed max;
586 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
589 if (status & PCI_X_SSTATUS_533MHZ) {
590 max = PCI_SPEED_133MHz_PCIX_533;
591 } else if (status & PCI_X_SSTATUS_266MHZ) {
592 max = PCI_SPEED_133MHz_PCIX_266;
593 } else if (status & PCI_X_SSTATUS_133MHZ) {
594 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) {
595 max = PCI_SPEED_133MHz_PCIX_ECC;
597 max = PCI_SPEED_133MHz_PCIX;
600 max = PCI_SPEED_66MHz_PCIX;
603 bus->max_bus_speed = max;
604 bus->cur_bus_speed = pcix_bus_speed[
605 (status & PCI_X_SSTATUS_FREQ) >> 6];
610 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
615 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
616 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
618 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
619 pcie_update_link_speed(bus, linksta);
624 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
625 struct pci_dev *bridge, int busnr)
627 struct pci_bus *child;
632 * Allocate a new bus, and inherit stuff from the parent..
634 child = pci_alloc_bus();
638 child->parent = parent;
639 child->ops = parent->ops;
640 child->msi = parent->msi;
641 child->sysdata = parent->sysdata;
642 child->bus_flags = parent->bus_flags;
644 /* initialize some portions of the bus device, but don't register it
645 * now as the parent is not properly set up yet.
647 child->dev.class = &pcibus_class;
648 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
651 * Set up the primary, secondary and subordinate
654 child->number = child->busn_res.start = busnr;
655 child->primary = parent->busn_res.start;
656 child->busn_res.end = 0xff;
659 child->dev.parent = parent->bridge;
663 child->self = bridge;
664 child->bridge = get_device(&bridge->dev);
665 child->dev.parent = child->bridge;
666 pci_set_bus_of_node(child);
667 pci_set_bus_speed(child);
669 /* Set up default resource pointers and names.. */
670 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
671 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
672 child->resource[i]->name = child->name;
674 bridge->subordinate = child;
677 ret = device_register(&child->dev);
680 pcibios_add_bus(child);
682 /* Create legacy_io and legacy_mem files for this bus */
683 pci_create_legacy_files(child);
688 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
690 struct pci_bus *child;
692 child = pci_alloc_child_bus(parent, dev, busnr);
694 down_write(&pci_bus_sem);
695 list_add_tail(&child->node, &parent->children);
696 up_write(&pci_bus_sem);
701 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
703 struct pci_bus *parent = child->parent;
705 /* Attempts to fix that up are really dangerous unless
706 we're going to re-assign all bus numbers. */
707 if (!pcibios_assign_all_busses())
710 while (parent->parent && parent->busn_res.end < max) {
711 parent->busn_res.end = max;
712 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
713 parent = parent->parent;
718 * If it's a bridge, configure it and scan the bus behind it.
719 * For CardBus bridges, we don't scan behind as the devices will
720 * be handled by the bridge driver itself.
722 * We need to process bridges in two passes -- first we scan those
723 * already configured by the BIOS and after we are done with all of
724 * them, we proceed to assigning numbers to the remaining buses in
725 * order to avoid overlaps between old and new bus numbers.
727 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
729 struct pci_bus *child;
730 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
733 u8 primary, secondary, subordinate;
736 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
737 primary = buses & 0xFF;
738 secondary = (buses >> 8) & 0xFF;
739 subordinate = (buses >> 16) & 0xFF;
741 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
742 secondary, subordinate, pass);
744 if (!primary && (primary != bus->number) && secondary && subordinate) {
745 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
746 primary = bus->number;
749 /* Check if setup is sensible at all */
751 (primary != bus->number || secondary <= bus->number ||
752 secondary > subordinate)) {
753 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
754 secondary, subordinate);
758 /* Disable MasterAbortMode during probing to avoid reporting
759 of bus errors (in some architectures) */
760 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
761 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
762 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
764 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
765 !is_cardbus && !broken) {
768 * Bus already configured by firmware, process it in the first
769 * pass and just note the configuration.
775 * If we already got to this bus through a different bridge,
776 * don't re-add it. This can happen with the i450NX chipset.
778 * However, we continue to descend down the hierarchy and
779 * scan remaining child buses.
781 child = pci_find_bus(pci_domain_nr(bus), secondary);
783 child = pci_add_new_bus(bus, dev, secondary);
786 child->primary = primary;
787 pci_bus_insert_busn_res(child, secondary, subordinate);
788 child->bridge_ctl = bctl;
791 cmax = pci_scan_child_bus(child);
794 if (child->busn_res.end > max)
795 max = child->busn_res.end;
798 * We need to assign a number to this bus which we always
799 * do in the second pass.
802 if (pcibios_assign_all_busses() || broken)
803 /* Temporarily disable forwarding of the
804 configuration cycles on all bridges in
805 this bus segment to avoid possible
806 conflicts in the second pass between two
807 bridges programmed with overlapping
809 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
815 pci_write_config_word(dev, PCI_STATUS, 0xffff);
817 /* Prevent assigning a bus number that already exists.
818 * This can happen when a bridge is hot-plugged, so in
819 * this case we only re-scan this bus. */
820 child = pci_find_bus(pci_domain_nr(bus), max+1);
822 child = pci_add_new_bus(bus, dev, ++max);
825 pci_bus_insert_busn_res(child, max, 0xff);
827 buses = (buses & 0xff000000)
828 | ((unsigned int)(child->primary) << 0)
829 | ((unsigned int)(child->busn_res.start) << 8)
830 | ((unsigned int)(child->busn_res.end) << 16);
833 * yenta.c forces a secondary latency timer of 176.
834 * Copy that behaviour here.
837 buses &= ~0xff000000;
838 buses |= CARDBUS_LATENCY_TIMER << 24;
842 * We need to blast all three values with a single write.
844 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
847 child->bridge_ctl = bctl;
849 * Adjust subordinate busnr in parent buses.
850 * We do this before scanning for children because
851 * some devices may not be detected if the bios
854 pci_fixup_parent_subordinate_busnr(child, max);
855 /* Now we can scan all subordinate buses... */
856 max = pci_scan_child_bus(child);
858 * now fix it up again since we have found
859 * the real value of max.
861 pci_fixup_parent_subordinate_busnr(child, max);
864 * For CardBus bridges, we leave 4 bus numbers
865 * as cards with a PCI-to-PCI bridge can be
868 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
869 struct pci_bus *parent = bus;
870 if (pci_find_bus(pci_domain_nr(bus),
873 while (parent->parent) {
874 if ((!pcibios_assign_all_busses()) &&
875 (parent->busn_res.end > max) &&
876 (parent->busn_res.end <= max+i)) {
879 parent = parent->parent;
883 * Often, there are two cardbus bridges
884 * -- try to leave one valid bus number
892 pci_fixup_parent_subordinate_busnr(child, max);
895 * Set the subordinate bus number to its real value.
897 pci_bus_update_busn_res_end(child, max);
898 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
902 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
903 pci_domain_nr(bus), child->number);
905 /* Has only triggered on CardBus, fixup is in yenta_socket */
906 while (bus->parent) {
907 if ((child->busn_res.end > bus->busn_res.end) ||
908 (child->number > bus->busn_res.end) ||
909 (child->number < bus->number) ||
910 (child->busn_res.end < bus->number)) {
911 dev_info(&child->dev, "%pR %s "
912 "hidden behind%s bridge %s %pR\n",
914 (bus->number > child->busn_res.end &&
915 bus->busn_res.end < child->number) ?
916 "wholly" : "partially",
917 bus->self->transparent ? " transparent" : "",
925 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
931 * Read interrupt line and base address registers.
932 * The architecture-dependent code can tweak these, of course.
934 static void pci_read_irq(struct pci_dev *dev)
938 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
941 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
945 void set_pcie_port_type(struct pci_dev *pdev)
950 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
954 pdev->pcie_cap = pos;
955 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
956 pdev->pcie_flags_reg = reg16;
957 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
958 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
961 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
965 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
966 if (reg32 & PCI_EXP_SLTCAP_HPC)
967 pdev->is_hotplug_bridge = 1;
970 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
973 * pci_setup_device - fill in class and map information of a device
974 * @dev: the device structure to fill
976 * Initialize the device structure with information about the device's
977 * vendor,class,memory and IO-space addresses,IRQ lines etc.
978 * Called at initialisation of the PCI subsystem and by CardBus services.
979 * Returns 0 on success and negative if unknown type of device (not normal,
980 * bridge or CardBus).
982 int pci_setup_device(struct pci_dev *dev)
986 struct pci_slot *slot;
988 struct pci_bus_region region;
989 struct resource *res;
991 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
994 dev->sysdata = dev->bus->sysdata;
995 dev->dev.parent = dev->bus->bridge;
996 dev->dev.bus = &pci_bus_type;
997 dev->hdr_type = hdr_type & 0x7f;
998 dev->multifunction = !!(hdr_type & 0x80);
999 dev->error_state = pci_channel_io_normal;
1000 set_pcie_port_type(dev);
1002 list_for_each_entry(slot, &dev->bus->slots, list)
1003 if (PCI_SLOT(dev->devfn) == slot->number)
1006 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1007 set this higher, assuming the system even supports it. */
1008 dev->dma_mask = 0xffffffff;
1010 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1011 dev->bus->number, PCI_SLOT(dev->devfn),
1012 PCI_FUNC(dev->devfn));
1014 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1015 dev->revision = class & 0xff;
1016 dev->class = class >> 8; /* upper 3 bytes */
1018 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1019 dev->vendor, dev->device, dev->hdr_type, dev->class);
1021 /* need to have dev->class ready */
1022 dev->cfg_size = pci_cfg_space_size(dev);
1024 /* "Unknown power state" */
1025 dev->current_state = PCI_UNKNOWN;
1027 /* Early fixups, before probing the BARs */
1028 pci_fixup_device(pci_fixup_early, dev);
1029 /* device class may be changed after fixup */
1030 class = dev->class >> 8;
1032 switch (dev->hdr_type) { /* header type */
1033 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1034 if (class == PCI_CLASS_BRIDGE_PCI)
1037 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1038 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1039 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1042 * Do the ugly legacy mode stuff here rather than broken chip
1043 * quirk code. Legacy mode ATA controllers have fixed
1044 * addresses. These are not always echoed in BAR0-3, and
1045 * BAR0-3 in a few cases contain junk!
1047 if (class == PCI_CLASS_STORAGE_IDE) {
1049 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1050 if ((progif & 1) == 0) {
1051 region.start = 0x1F0;
1053 res = &dev->resource[0];
1054 res->flags = LEGACY_IO_RESOURCE;
1055 pcibios_bus_to_resource(dev, res, ®ion);
1056 region.start = 0x3F6;
1058 res = &dev->resource[1];
1059 res->flags = LEGACY_IO_RESOURCE;
1060 pcibios_bus_to_resource(dev, res, ®ion);
1062 if ((progif & 4) == 0) {
1063 region.start = 0x170;
1065 res = &dev->resource[2];
1066 res->flags = LEGACY_IO_RESOURCE;
1067 pcibios_bus_to_resource(dev, res, ®ion);
1068 region.start = 0x376;
1070 res = &dev->resource[3];
1071 res->flags = LEGACY_IO_RESOURCE;
1072 pcibios_bus_to_resource(dev, res, ®ion);
1077 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1078 if (class != PCI_CLASS_BRIDGE_PCI)
1080 /* The PCI-to-PCI bridge spec requires that subtractive
1081 decoding (i.e. transparent) bridge must have programming
1082 interface code of 0x01. */
1084 dev->transparent = ((dev->class & 0xff) == 1);
1085 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1086 set_pcie_hotplug_bridge(dev);
1087 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1089 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1090 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1094 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1095 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1098 pci_read_bases(dev, 1, 0);
1099 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1100 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1103 default: /* unknown header */
1104 dev_err(&dev->dev, "unknown header type %02x, "
1105 "ignoring device\n", dev->hdr_type);
1109 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header "
1110 "type %02x)\n", dev->class, dev->hdr_type);
1111 dev->class = PCI_CLASS_NOT_DEFINED;
1114 /* We found a fine healthy device, go go go... */
1118 static void pci_release_capabilities(struct pci_dev *dev)
1120 pci_vpd_release(dev);
1121 pci_iov_release(dev);
1122 pci_free_cap_save_buffers(dev);
1126 * pci_release_dev - free a pci device structure when all users of it are finished.
1127 * @dev: device that's been disconnected
1129 * Will be called only by the device core when all users of this pci device are
1132 static void pci_release_dev(struct device *dev)
1134 struct pci_dev *pci_dev;
1136 pci_dev = to_pci_dev(dev);
1137 pci_release_capabilities(pci_dev);
1138 pci_release_of_node(pci_dev);
1143 * pci_cfg_space_size - get the configuration space size of the PCI device.
1146 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1147 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1148 * access it. Maybe we don't have a way to generate extended config space
1149 * accesses, or the device is behind a reverse Express bridge. So we try
1150 * reading the dword at 0x100 which must either be 0 or a valid extended
1151 * capability header.
1153 int pci_cfg_space_size_ext(struct pci_dev *dev)
1156 int pos = PCI_CFG_SPACE_SIZE;
1158 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1160 if (status == 0xffffffff)
1163 return PCI_CFG_SPACE_EXP_SIZE;
1166 return PCI_CFG_SPACE_SIZE;
1169 int pci_cfg_space_size(struct pci_dev *dev)
1175 class = dev->class >> 8;
1176 if (class == PCI_CLASS_BRIDGE_HOST)
1177 return pci_cfg_space_size_ext(dev);
1179 if (!pci_is_pcie(dev)) {
1180 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1184 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1185 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1189 return pci_cfg_space_size_ext(dev);
1192 return PCI_CFG_SPACE_SIZE;
1195 static void pci_release_bus_bridge_dev(struct device *dev)
1197 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
1199 if (bridge->release_fn)
1200 bridge->release_fn(bridge);
1202 pci_free_resource_list(&bridge->windows);
1207 struct pci_dev *alloc_pci_dev(void)
1209 struct pci_dev *dev;
1211 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1215 INIT_LIST_HEAD(&dev->bus_list);
1216 dev->dev.type = &pci_dev_type;
1220 EXPORT_SYMBOL(alloc_pci_dev);
1222 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1227 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1230 /* some broken boards return 0 or ~0 if a slot is empty: */
1231 if (*l == 0xffffffff || *l == 0x00000000 ||
1232 *l == 0x0000ffff || *l == 0xffff0000)
1235 /* Configuration request Retry Status */
1236 while (*l == 0xffff0001) {
1242 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1244 /* Card hasn't responded in 60 seconds? Must be stuck. */
1245 if (delay > crs_timeout) {
1246 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1247 "responding\n", pci_domain_nr(bus),
1248 bus->number, PCI_SLOT(devfn),
1256 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1259 * Read the config data for a PCI device, sanity-check it
1260 * and fill in the dev structure...
1262 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1264 struct pci_dev *dev;
1267 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1270 dev = alloc_pci_dev();
1276 dev->vendor = l & 0xffff;
1277 dev->device = (l >> 16) & 0xffff;
1279 pci_set_of_node(dev);
1281 if (pci_setup_device(dev)) {
1289 static void pci_init_capabilities(struct pci_dev *dev)
1291 /* MSI/MSI-X list */
1292 pci_msi_init_pci_dev(dev);
1294 /* Buffers for saving PCIe and PCI-X capabilities */
1295 pci_allocate_cap_save_buffers(dev);
1297 /* Power Management */
1300 /* Vital Product Data */
1301 pci_vpd_pci22_init(dev);
1303 /* Alternative Routing-ID Forwarding */
1304 pci_configure_ari(dev);
1306 /* Single Root I/O Virtualization */
1309 /* Enable ACS P2P upstream forwarding */
1310 pci_enable_acs(dev);
1313 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1317 device_initialize(&dev->dev);
1318 dev->dev.release = pci_release_dev;
1320 set_dev_node(&dev->dev, pcibus_to_node(bus));
1321 dev->dev.dma_mask = &dev->dma_mask;
1322 dev->dev.dma_parms = &dev->dma_parms;
1323 dev->dev.coherent_dma_mask = 0xffffffffull;
1325 pci_set_dma_max_seg_size(dev, 65536);
1326 pci_set_dma_seg_boundary(dev, 0xffffffff);
1328 /* Fix up broken headers */
1329 pci_fixup_device(pci_fixup_header, dev);
1331 /* moved out from quirk header fixup code */
1332 pci_reassigndev_resource_alignment(dev);
1334 /* Clear the state_saved flag. */
1335 dev->state_saved = false;
1337 /* Initialize various capabilities */
1338 pci_init_capabilities(dev);
1341 * Add the device to our list of discovered devices
1342 * and the bus list for fixup functions, etc.
1344 down_write(&pci_bus_sem);
1345 list_add_tail(&dev->bus_list, &bus->devices);
1346 up_write(&pci_bus_sem);
1348 ret = pcibios_add_device(dev);
1351 /* Notifier could use PCI capabilities */
1352 dev->match_driver = false;
1353 ret = device_add(&dev->dev);
1356 pci_proc_attach_device(dev);
1359 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1361 struct pci_dev *dev;
1363 dev = pci_get_slot(bus, devfn);
1369 dev = pci_scan_device(bus, devfn);
1373 pci_device_add(dev, bus);
1377 EXPORT_SYMBOL(pci_scan_single_device);
1379 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1385 if (pci_ari_enabled(bus)) {
1388 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1392 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1393 next_fn = PCI_ARI_CAP_NFN(cap);
1395 return 0; /* protect against malformed list */
1400 /* dev may be NULL for non-contiguous multifunction devices */
1401 if (!dev || dev->multifunction)
1402 return (fn + 1) % 8;
1407 static int only_one_child(struct pci_bus *bus)
1409 struct pci_dev *parent = bus->self;
1411 if (!parent || !pci_is_pcie(parent))
1413 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1415 if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
1416 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1422 * pci_scan_slot - scan a PCI slot on a bus for devices.
1423 * @bus: PCI bus to scan
1424 * @devfn: slot number to scan (must have zero function.)
1426 * Scan a PCI slot on the specified PCI bus for devices, adding
1427 * discovered devices to the @bus->devices list. New devices
1428 * will not have is_added set.
1430 * Returns the number of new devices found.
1432 int pci_scan_slot(struct pci_bus *bus, int devfn)
1434 unsigned fn, nr = 0;
1435 struct pci_dev *dev;
1437 if (only_one_child(bus) && (devfn > 0))
1438 return 0; /* Already scanned the entire slot */
1440 dev = pci_scan_single_device(bus, devfn);
1446 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1447 dev = pci_scan_single_device(bus, devfn + fn);
1451 dev->multifunction = 1;
1455 /* only one slot has pcie device */
1456 if (bus->self && nr)
1457 pcie_aspm_init_link_state(bus->self);
1462 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1466 if (!pci_is_pcie(dev))
1469 /* For PCIE hotplug enabled slots not connected directly to a
1470 * PCI-E root port, there can be problems when hotplugging
1471 * devices. This is due to the possibility of hotplugging a
1472 * device into the fabric with a smaller MPS that the devices
1473 * currently running have configured. Modifying the MPS on the
1474 * running devices could cause a fatal bus error due to an
1475 * incoming frame being larger than the newly configured MPS.
1476 * To work around this, the MPS for the entire fabric must be
1477 * set to the minimum size. Any devices hotplugged into this
1478 * fabric will have the minimum MPS set. If the PCI hotplug
1479 * slot is directly connected to the root port and there are not
1480 * other devices on the fabric (which seems to be the most
1481 * common case), then this is not an issue and MPS discovery
1482 * will occur as normal.
1484 if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) ||
1486 pci_pcie_type(dev->bus->self) != PCI_EXP_TYPE_ROOT_PORT)))
1489 if (*smpss > dev->pcie_mpss)
1490 *smpss = dev->pcie_mpss;
1495 static void pcie_write_mps(struct pci_dev *dev, int mps)
1499 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1500 mps = 128 << dev->pcie_mpss;
1502 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1504 /* For "Performance", the assumption is made that
1505 * downstream communication will never be larger than
1506 * the MRRS. So, the MPS only needs to be configured
1507 * for the upstream communication. This being the case,
1508 * walk from the top down and set the MPS of the child
1509 * to that of the parent bus.
1511 * Configure the device MPS with the smaller of the
1512 * device MPSS or the bridge MPS (which is assumed to be
1513 * properly configured at this point to the largest
1514 * allowable MPS based on its parent bus).
1516 mps = min(mps, pcie_get_mps(dev->bus->self));
1519 rc = pcie_set_mps(dev, mps);
1521 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1524 static void pcie_write_mrrs(struct pci_dev *dev)
1528 /* In the "safe" case, do not configure the MRRS. There appear to be
1529 * issues with setting MRRS to 0 on a number of devices.
1531 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1534 /* For Max performance, the MRRS must be set to the largest supported
1535 * value. However, it cannot be configured larger than the MPS the
1536 * device or the bus can support. This should already be properly
1537 * configured by a prior call to pcie_write_mps.
1539 mrrs = pcie_get_mps(dev);
1541 /* MRRS is a R/W register. Invalid values can be written, but a
1542 * subsequent read will verify if the value is acceptable or not.
1543 * If the MRRS value provided is not acceptable (e.g., too large),
1544 * shrink the value until it is acceptable to the HW.
1546 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1547 rc = pcie_set_readrq(dev, mrrs);
1551 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1556 dev_err(&dev->dev, "MRRS was unable to be configured with a "
1557 "safe value. If problems are experienced, try running "
1558 "with pci=pcie_bus_safe.\n");
1561 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1565 if (!pci_is_pcie(dev))
1568 mps = 128 << *(u8 *)data;
1569 orig_mps = pcie_get_mps(dev);
1571 pcie_write_mps(dev, mps);
1572 pcie_write_mrrs(dev);
1574 dev_info(&dev->dev, "PCI-E Max Payload Size set to %4d/%4d (was %4d), "
1575 "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss,
1576 orig_mps, pcie_get_readrq(dev));
1581 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1582 * parents then children fashion. If this changes, then this code will not
1585 void pcie_bus_configure_settings(struct pci_bus *bus)
1592 if (!pci_is_pcie(bus->self))
1595 if (pcie_bus_config == PCIE_BUS_TUNE_OFF)
1598 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1599 * to be aware to the MPS of the destination. To work around this,
1600 * simply force the MPS of the entire system to the smallest possible.
1602 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1605 if (pcie_bus_config == PCIE_BUS_SAFE) {
1606 smpss = bus->self->pcie_mpss;
1608 pcie_find_smpss(bus->self, &smpss);
1609 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1612 pcie_bus_configure_set(bus->self, &smpss);
1613 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1615 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1617 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1619 unsigned int devfn, pass, max = bus->busn_res.start;
1620 struct pci_dev *dev;
1622 dev_dbg(&bus->dev, "scanning bus\n");
1624 /* Go find them, Rover! */
1625 for (devfn = 0; devfn < 0x100; devfn += 8)
1626 pci_scan_slot(bus, devfn);
1628 /* Reserve buses for SR-IOV capability. */
1629 max += pci_iov_bus_range(bus);
1632 * After performing arch-dependent fixup of the bus, look behind
1633 * all PCI-to-PCI bridges on this bus.
1635 if (!bus->is_added) {
1636 dev_dbg(&bus->dev, "fixups for bus\n");
1637 pcibios_fixup_bus(bus);
1641 for (pass=0; pass < 2; pass++)
1642 list_for_each_entry(dev, &bus->devices, bus_list) {
1643 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1644 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1645 max = pci_scan_bridge(bus, dev, max, pass);
1649 * We've scanned the bus and so we know all about what's on
1650 * the other side of any bridges that may be on this bus plus
1653 * Return how far we've got finding sub-buses.
1655 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1660 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
1661 * @bridge: Host bridge to set up.
1663 * Default empty implementation. Replace with an architecture-specific setup
1664 * routine, if necessary.
1666 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1671 void __weak pcibios_add_bus(struct pci_bus *bus)
1675 void __weak pcibios_remove_bus(struct pci_bus *bus)
1679 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
1680 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1683 struct pci_host_bridge *bridge;
1684 struct pci_bus *b, *b2;
1685 struct pci_host_bridge_window *window, *n;
1686 struct resource *res;
1687 resource_size_t offset;
1691 b = pci_alloc_bus();
1695 b->sysdata = sysdata;
1697 b->number = b->busn_res.start = bus;
1698 b2 = pci_find_bus(pci_domain_nr(b), bus);
1700 /* If we already got to this bus through a different bridge, ignore it */
1701 dev_dbg(&b2->dev, "bus already known\n");
1705 bridge = pci_alloc_host_bridge(b);
1709 bridge->dev.parent = parent;
1710 bridge->dev.release = pci_release_bus_bridge_dev;
1711 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1712 error = pcibios_root_bridge_prepare(bridge);
1718 error = device_register(&bridge->dev);
1720 put_device(&bridge->dev);
1723 b->bridge = get_device(&bridge->dev);
1724 device_enable_async_suspend(b->bridge);
1725 pci_set_bus_of_node(b);
1728 set_dev_node(b->bridge, pcibus_to_node(b));
1730 b->dev.class = &pcibus_class;
1731 b->dev.parent = b->bridge;
1732 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1733 error = device_register(&b->dev);
1735 goto class_dev_reg_err;
1739 /* Create legacy_io and legacy_mem files for this bus */
1740 pci_create_legacy_files(b);
1743 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
1745 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
1747 /* Add initial resources to the bus */
1748 list_for_each_entry_safe(window, n, resources, list) {
1749 list_move_tail(&window->list, &bridge->windows);
1751 offset = window->offset;
1752 if (res->flags & IORESOURCE_BUS)
1753 pci_bus_insert_busn_res(b, bus, res->end);
1755 pci_bus_add_resource(b, res, 0);
1757 if (resource_type(res) == IORESOURCE_IO)
1758 fmt = " (bus address [%#06llx-%#06llx])";
1760 fmt = " (bus address [%#010llx-%#010llx])";
1761 snprintf(bus_addr, sizeof(bus_addr), fmt,
1762 (unsigned long long) (res->start - offset),
1763 (unsigned long long) (res->end - offset));
1766 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
1769 down_write(&pci_bus_sem);
1770 list_add_tail(&b->node, &pci_root_buses);
1771 up_write(&pci_bus_sem);
1776 put_device(&bridge->dev);
1777 device_unregister(&bridge->dev);
1782 EXPORT_SYMBOL(pci_create_root_bus);
1784 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
1786 struct resource *res = &b->busn_res;
1787 struct resource *parent_res, *conflict;
1791 res->flags = IORESOURCE_BUS;
1793 if (!pci_is_root_bus(b))
1794 parent_res = &b->parent->busn_res;
1796 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
1797 res->flags |= IORESOURCE_PCI_FIXED;
1800 conflict = insert_resource_conflict(parent_res, res);
1803 dev_printk(KERN_DEBUG, &b->dev,
1804 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
1805 res, pci_is_root_bus(b) ? "domain " : "",
1806 parent_res, conflict->name, conflict);
1808 return conflict == NULL;
1811 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
1813 struct resource *res = &b->busn_res;
1814 struct resource old_res = *res;
1815 resource_size_t size;
1818 if (res->start > bus_max)
1821 size = bus_max - res->start + 1;
1822 ret = adjust_resource(res, res->start, size);
1823 dev_printk(KERN_DEBUG, &b->dev,
1824 "busn_res: %pR end %s updated to %02x\n",
1825 &old_res, ret ? "can not be" : "is", bus_max);
1827 if (!ret && !res->parent)
1828 pci_bus_insert_busn_res(b, res->start, res->end);
1833 void pci_bus_release_busn_res(struct pci_bus *b)
1835 struct resource *res = &b->busn_res;
1838 if (!res->flags || !res->parent)
1841 ret = release_resource(res);
1842 dev_printk(KERN_DEBUG, &b->dev,
1843 "busn_res: %pR %s released\n",
1844 res, ret ? "can not be" : "is");
1847 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
1848 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1850 struct pci_host_bridge_window *window;
1855 list_for_each_entry(window, resources, list)
1856 if (window->res->flags & IORESOURCE_BUS) {
1861 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
1867 "No busn resource found for root bus, will use [bus %02x-ff]\n",
1869 pci_bus_insert_busn_res(b, bus, 255);
1872 max = pci_scan_child_bus(b);
1875 pci_bus_update_busn_res_end(b, max);
1877 pci_bus_add_devices(b);
1880 EXPORT_SYMBOL(pci_scan_root_bus);
1882 /* Deprecated; use pci_scan_root_bus() instead */
1883 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1884 int bus, struct pci_ops *ops, void *sysdata)
1886 LIST_HEAD(resources);
1889 pci_add_resource(&resources, &ioport_resource);
1890 pci_add_resource(&resources, &iomem_resource);
1891 pci_add_resource(&resources, &busn_resource);
1892 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
1894 pci_scan_child_bus(b);
1896 pci_free_resource_list(&resources);
1899 EXPORT_SYMBOL(pci_scan_bus_parented);
1901 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
1904 LIST_HEAD(resources);
1907 pci_add_resource(&resources, &ioport_resource);
1908 pci_add_resource(&resources, &iomem_resource);
1909 pci_add_resource(&resources, &busn_resource);
1910 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
1912 pci_scan_child_bus(b);
1913 pci_bus_add_devices(b);
1915 pci_free_resource_list(&resources);
1919 EXPORT_SYMBOL(pci_scan_bus);
1922 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
1923 * @bridge: PCI bridge for the bus to scan
1925 * Scan a PCI bus and child buses for new devices, add them,
1926 * and enable them, resizing bridge mmio/io resource if necessary
1927 * and possible. The caller must ensure the child devices are already
1928 * removed for resizing to occur.
1930 * Returns the max number of subordinate bus discovered.
1932 unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
1935 struct pci_bus *bus = bridge->subordinate;
1937 max = pci_scan_child_bus(bus);
1939 pci_assign_unassigned_bridge_resources(bridge);
1941 pci_bus_add_devices(bus);
1947 * pci_rescan_bus - scan a PCI bus for devices.
1948 * @bus: PCI bus to scan
1950 * Scan a PCI bus and child buses for new devices, adds them,
1953 * Returns the max number of subordinate bus discovered.
1955 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1959 max = pci_scan_child_bus(bus);
1960 pci_assign_unassigned_bus_resources(bus);
1961 pci_enable_bridges(bus);
1962 pci_bus_add_devices(bus);
1966 EXPORT_SYMBOL_GPL(pci_rescan_bus);
1968 EXPORT_SYMBOL(pci_add_new_bus);
1969 EXPORT_SYMBOL(pci_scan_slot);
1970 EXPORT_SYMBOL(pci_scan_bridge);
1971 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1973 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1975 const struct pci_dev *a = to_pci_dev(d_a);
1976 const struct pci_dev *b = to_pci_dev(d_b);
1978 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1979 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1981 if (a->bus->number < b->bus->number) return -1;
1982 else if (a->bus->number > b->bus->number) return 1;
1984 if (a->devfn < b->devfn) return -1;
1985 else if (a->devfn > b->devfn) return 1;
1990 void __init pci_sort_breadthfirst(void)
1992 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);