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);
253 pcibios_bus_to_resource(dev, res, ®ion);
257 region.end = l64 + sz64;
258 pcibios_bus_to_resource(dev, res, ®ion);
261 sz = pci_size(l, sz, mask);
268 pcibios_bus_to_resource(dev, res, ®ion);
277 if (!dev->mmio_always_on)
278 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
281 dev_err(&dev->dev, "reg %x: can't handle 64-bit BAR\n", pos);
282 if (res->flags && !bar_disabled)
283 dev_printk(KERN_DEBUG, &dev->dev, "reg %x: %pR\n", pos, res);
285 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
288 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
290 unsigned int pos, reg;
292 for (pos = 0; pos < howmany; pos++) {
293 struct resource *res = &dev->resource[pos];
294 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
295 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
299 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
300 dev->rom_base_reg = rom;
301 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
302 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
303 IORESOURCE_SIZEALIGN;
304 __pci_read_base(dev, pci_bar_mem32, res, rom);
308 static void __devinit pci_read_bridge_io(struct pci_bus *child)
310 struct pci_dev *dev = child->self;
311 u8 io_base_lo, io_limit_lo;
312 unsigned long io_mask, io_granularity, base, limit;
313 struct pci_bus_region region;
314 struct resource *res;
316 io_mask = PCI_IO_RANGE_MASK;
317 io_granularity = 0x1000;
318 if (dev->io_window_1k) {
319 /* Support 1K I/O space granularity */
320 io_mask = PCI_IO_1K_RANGE_MASK;
321 io_granularity = 0x400;
324 res = child->resource[0];
325 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
326 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
327 base = (io_base_lo & io_mask) << 8;
328 limit = (io_limit_lo & io_mask) << 8;
330 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
331 u16 io_base_hi, io_limit_hi;
333 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
334 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
335 base |= ((unsigned long) io_base_hi << 16);
336 limit |= ((unsigned long) io_limit_hi << 16);
340 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
342 region.end = limit + io_granularity - 1;
343 pcibios_bus_to_resource(dev, res, ®ion);
344 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
348 static void __devinit pci_read_bridge_mmio(struct pci_bus *child)
350 struct pci_dev *dev = child->self;
351 u16 mem_base_lo, mem_limit_lo;
352 unsigned long base, limit;
353 struct pci_bus_region region;
354 struct resource *res;
356 res = child->resource[1];
357 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
358 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
359 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
360 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
362 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
364 region.end = limit + 0xfffff;
365 pcibios_bus_to_resource(dev, res, ®ion);
366 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
370 static void __devinit pci_read_bridge_mmio_pref(struct pci_bus *child)
372 struct pci_dev *dev = child->self;
373 u16 mem_base_lo, mem_limit_lo;
374 unsigned long base, limit;
375 struct pci_bus_region region;
376 struct resource *res;
378 res = child->resource[2];
379 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
380 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
381 base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
382 limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
384 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
385 u32 mem_base_hi, mem_limit_hi;
387 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
388 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
391 * Some bridges set the base > limit by default, and some
392 * (broken) BIOSes do not initialize them. If we find
393 * this, just assume they are not being used.
395 if (mem_base_hi <= mem_limit_hi) {
396 #if BITS_PER_LONG == 64
397 base |= ((unsigned long) mem_base_hi) << 32;
398 limit |= ((unsigned long) mem_limit_hi) << 32;
400 if (mem_base_hi || mem_limit_hi) {
401 dev_err(&dev->dev, "can't handle 64-bit "
402 "address space for bridge\n");
409 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
410 IORESOURCE_MEM | IORESOURCE_PREFETCH;
411 if (res->flags & PCI_PREF_RANGE_TYPE_64)
412 res->flags |= IORESOURCE_MEM_64;
414 region.end = limit + 0xfffff;
415 pcibios_bus_to_resource(dev, res, ®ion);
416 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
420 void __devinit pci_read_bridge_bases(struct pci_bus *child)
422 struct pci_dev *dev = child->self;
423 struct resource *res;
426 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
429 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
431 dev->transparent ? " (subtractive decode)" : "");
433 pci_bus_remove_resources(child);
434 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
435 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
437 pci_read_bridge_io(child);
438 pci_read_bridge_mmio(child);
439 pci_read_bridge_mmio_pref(child);
441 if (dev->transparent) {
442 pci_bus_for_each_resource(child->parent, res, i) {
444 pci_bus_add_resource(child, res,
445 PCI_SUBTRACTIVE_DECODE);
446 dev_printk(KERN_DEBUG, &dev->dev,
447 " bridge window %pR (subtractive decode)\n",
454 static struct pci_bus * pci_alloc_bus(void)
458 b = kzalloc(sizeof(*b), GFP_KERNEL);
460 INIT_LIST_HEAD(&b->node);
461 INIT_LIST_HEAD(&b->children);
462 INIT_LIST_HEAD(&b->devices);
463 INIT_LIST_HEAD(&b->slots);
464 INIT_LIST_HEAD(&b->resources);
465 b->max_bus_speed = PCI_SPEED_UNKNOWN;
466 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
471 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
473 struct pci_host_bridge *bridge;
475 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
477 INIT_LIST_HEAD(&bridge->windows);
484 static unsigned char pcix_bus_speed[] = {
485 PCI_SPEED_UNKNOWN, /* 0 */
486 PCI_SPEED_66MHz_PCIX, /* 1 */
487 PCI_SPEED_100MHz_PCIX, /* 2 */
488 PCI_SPEED_133MHz_PCIX, /* 3 */
489 PCI_SPEED_UNKNOWN, /* 4 */
490 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
491 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
492 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
493 PCI_SPEED_UNKNOWN, /* 8 */
494 PCI_SPEED_66MHz_PCIX_266, /* 9 */
495 PCI_SPEED_100MHz_PCIX_266, /* A */
496 PCI_SPEED_133MHz_PCIX_266, /* B */
497 PCI_SPEED_UNKNOWN, /* C */
498 PCI_SPEED_66MHz_PCIX_533, /* D */
499 PCI_SPEED_100MHz_PCIX_533, /* E */
500 PCI_SPEED_133MHz_PCIX_533 /* F */
503 static unsigned char pcie_link_speed[] = {
504 PCI_SPEED_UNKNOWN, /* 0 */
505 PCIE_SPEED_2_5GT, /* 1 */
506 PCIE_SPEED_5_0GT, /* 2 */
507 PCIE_SPEED_8_0GT, /* 3 */
508 PCI_SPEED_UNKNOWN, /* 4 */
509 PCI_SPEED_UNKNOWN, /* 5 */
510 PCI_SPEED_UNKNOWN, /* 6 */
511 PCI_SPEED_UNKNOWN, /* 7 */
512 PCI_SPEED_UNKNOWN, /* 8 */
513 PCI_SPEED_UNKNOWN, /* 9 */
514 PCI_SPEED_UNKNOWN, /* A */
515 PCI_SPEED_UNKNOWN, /* B */
516 PCI_SPEED_UNKNOWN, /* C */
517 PCI_SPEED_UNKNOWN, /* D */
518 PCI_SPEED_UNKNOWN, /* E */
519 PCI_SPEED_UNKNOWN /* F */
522 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
524 bus->cur_bus_speed = pcie_link_speed[linksta & 0xf];
526 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
528 static unsigned char agp_speeds[] = {
536 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
542 else if (agpstat & 2)
544 else if (agpstat & 1)
556 return agp_speeds[index];
560 static void pci_set_bus_speed(struct pci_bus *bus)
562 struct pci_dev *bridge = bus->self;
565 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
567 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
571 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
572 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
574 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
575 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
578 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
581 enum pci_bus_speed max;
582 pci_read_config_word(bridge, pos + 2, &status);
584 if (status & 0x8000) {
585 max = PCI_SPEED_133MHz_PCIX_533;
586 } else if (status & 0x4000) {
587 max = PCI_SPEED_133MHz_PCIX_266;
588 } else if (status & 0x0002) {
589 if (((status >> 12) & 0x3) == 2) {
590 max = PCI_SPEED_133MHz_PCIX_ECC;
592 max = PCI_SPEED_133MHz_PCIX;
595 max = PCI_SPEED_66MHz_PCIX;
598 bus->max_bus_speed = max;
599 bus->cur_bus_speed = pcix_bus_speed[(status >> 6) & 0xf];
604 pos = pci_find_capability(bridge, PCI_CAP_ID_EXP);
609 pci_read_config_dword(bridge, pos + PCI_EXP_LNKCAP, &linkcap);
610 bus->max_bus_speed = pcie_link_speed[linkcap & 0xf];
612 pci_read_config_word(bridge, pos + PCI_EXP_LNKSTA, &linksta);
613 pcie_update_link_speed(bus, linksta);
618 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
619 struct pci_dev *bridge, int busnr)
621 struct pci_bus *child;
625 * Allocate a new bus, and inherit stuff from the parent..
627 child = pci_alloc_bus();
631 child->parent = parent;
632 child->ops = parent->ops;
633 child->sysdata = parent->sysdata;
634 child->bus_flags = parent->bus_flags;
636 /* initialize some portions of the bus device, but don't register it
637 * now as the parent is not properly set up yet. This device will get
638 * registered later in pci_bus_add_devices()
640 child->dev.class = &pcibus_class;
641 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
644 * Set up the primary, secondary and subordinate
647 child->number = child->busn_res.start = busnr;
648 child->primary = parent->busn_res.start;
649 child->busn_res.end = 0xff;
654 child->self = bridge;
655 child->bridge = get_device(&bridge->dev);
656 pci_set_bus_of_node(child);
657 pci_set_bus_speed(child);
659 /* Set up default resource pointers and names.. */
660 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
661 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
662 child->resource[i]->name = child->name;
664 bridge->subordinate = child;
669 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
671 struct pci_bus *child;
673 child = pci_alloc_child_bus(parent, dev, busnr);
675 down_write(&pci_bus_sem);
676 list_add_tail(&child->node, &parent->children);
677 up_write(&pci_bus_sem);
682 static void pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
684 struct pci_bus *parent = child->parent;
686 /* Attempts to fix that up are really dangerous unless
687 we're going to re-assign all bus numbers. */
688 if (!pcibios_assign_all_busses())
691 while (parent->parent && parent->busn_res.end < max) {
692 parent->busn_res.end = max;
693 pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
694 parent = parent->parent;
699 * If it's a bridge, configure it and scan the bus behind it.
700 * For CardBus bridges, we don't scan behind as the devices will
701 * be handled by the bridge driver itself.
703 * We need to process bridges in two passes -- first we scan those
704 * already configured by the BIOS and after we are done with all of
705 * them, we proceed to assigning numbers to the remaining buses in
706 * order to avoid overlaps between old and new bus numbers.
708 int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
710 struct pci_bus *child;
711 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
714 u8 primary, secondary, subordinate;
717 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
718 primary = buses & 0xFF;
719 secondary = (buses >> 8) & 0xFF;
720 subordinate = (buses >> 16) & 0xFF;
722 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
723 secondary, subordinate, pass);
725 if (!primary && (primary != bus->number) && secondary && subordinate) {
726 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
727 primary = bus->number;
730 /* Check if setup is sensible at all */
732 (primary != bus->number || secondary <= bus->number)) {
733 dev_dbg(&dev->dev, "bus configuration invalid, reconfiguring\n");
737 /* Disable MasterAbortMode during probing to avoid reporting
738 of bus errors (in some architectures) */
739 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
740 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
741 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
743 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
744 !is_cardbus && !broken) {
747 * Bus already configured by firmware, process it in the first
748 * pass and just note the configuration.
754 * If we already got to this bus through a different bridge,
755 * don't re-add it. This can happen with the i450NX chipset.
757 * However, we continue to descend down the hierarchy and
758 * scan remaining child buses.
760 child = pci_find_bus(pci_domain_nr(bus), secondary);
762 child = pci_add_new_bus(bus, dev, secondary);
765 child->primary = primary;
766 pci_bus_insert_busn_res(child, secondary, subordinate);
767 child->bridge_ctl = bctl;
770 cmax = pci_scan_child_bus(child);
773 if (child->busn_res.end > max)
774 max = child->busn_res.end;
777 * We need to assign a number to this bus which we always
778 * do in the second pass.
781 if (pcibios_assign_all_busses() || broken)
782 /* Temporarily disable forwarding of the
783 configuration cycles on all bridges in
784 this bus segment to avoid possible
785 conflicts in the second pass between two
786 bridges programmed with overlapping
788 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
794 pci_write_config_word(dev, PCI_STATUS, 0xffff);
796 /* Prevent assigning a bus number that already exists.
797 * This can happen when a bridge is hot-plugged, so in
798 * this case we only re-scan this bus. */
799 child = pci_find_bus(pci_domain_nr(bus), max+1);
801 child = pci_add_new_bus(bus, dev, ++max);
804 pci_bus_insert_busn_res(child, max, 0xff);
806 buses = (buses & 0xff000000)
807 | ((unsigned int)(child->primary) << 0)
808 | ((unsigned int)(child->busn_res.start) << 8)
809 | ((unsigned int)(child->busn_res.end) << 16);
812 * yenta.c forces a secondary latency timer of 176.
813 * Copy that behaviour here.
816 buses &= ~0xff000000;
817 buses |= CARDBUS_LATENCY_TIMER << 24;
821 * We need to blast all three values with a single write.
823 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
826 child->bridge_ctl = bctl;
828 * Adjust subordinate busnr in parent buses.
829 * We do this before scanning for children because
830 * some devices may not be detected if the bios
833 pci_fixup_parent_subordinate_busnr(child, max);
834 /* Now we can scan all subordinate buses... */
835 max = pci_scan_child_bus(child);
837 * now fix it up again since we have found
838 * the real value of max.
840 pci_fixup_parent_subordinate_busnr(child, max);
843 * For CardBus bridges, we leave 4 bus numbers
844 * as cards with a PCI-to-PCI bridge can be
847 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
848 struct pci_bus *parent = bus;
849 if (pci_find_bus(pci_domain_nr(bus),
852 while (parent->parent) {
853 if ((!pcibios_assign_all_busses()) &&
854 (parent->busn_res.end > max) &&
855 (parent->busn_res.end <= max+i)) {
858 parent = parent->parent;
862 * Often, there are two cardbus bridges
863 * -- try to leave one valid bus number
871 pci_fixup_parent_subordinate_busnr(child, max);
874 * Set the subordinate bus number to its real value.
876 pci_bus_update_busn_res_end(child, max);
877 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
881 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
882 pci_domain_nr(bus), child->number);
884 /* Has only triggered on CardBus, fixup is in yenta_socket */
885 while (bus->parent) {
886 if ((child->busn_res.end > bus->busn_res.end) ||
887 (child->number > bus->busn_res.end) ||
888 (child->number < bus->number) ||
889 (child->busn_res.end < bus->number)) {
890 dev_info(&child->dev, "%pR %s "
891 "hidden behind%s bridge %s %pR\n",
893 (bus->number > child->busn_res.end &&
894 bus->busn_res.end < child->number) ?
895 "wholly" : "partially",
896 bus->self->transparent ? " transparent" : "",
904 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
910 * Read interrupt line and base address registers.
911 * The architecture-dependent code can tweak these, of course.
913 static void pci_read_irq(struct pci_dev *dev)
917 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
920 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
924 void set_pcie_port_type(struct pci_dev *pdev)
929 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
933 pdev->pcie_cap = pos;
934 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
935 pdev->pcie_type = (reg16 & PCI_EXP_FLAGS_TYPE) >> 4;
936 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
937 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
940 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
946 pos = pci_pcie_cap(pdev);
949 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
950 if (!(reg16 & PCI_EXP_FLAGS_SLOT))
952 pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, ®32);
953 if (reg32 & PCI_EXP_SLTCAP_HPC)
954 pdev->is_hotplug_bridge = 1;
957 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
960 * pci_setup_device - fill in class and map information of a device
961 * @dev: the device structure to fill
963 * Initialize the device structure with information about the device's
964 * vendor,class,memory and IO-space addresses,IRQ lines etc.
965 * Called at initialisation of the PCI subsystem and by CardBus services.
966 * Returns 0 on success and negative if unknown type of device (not normal,
967 * bridge or CardBus).
969 int pci_setup_device(struct pci_dev *dev)
973 struct pci_slot *slot;
975 struct pci_bus_region region;
976 struct resource *res;
978 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
981 dev->sysdata = dev->bus->sysdata;
982 dev->dev.parent = dev->bus->bridge;
983 dev->dev.bus = &pci_bus_type;
984 dev->hdr_type = hdr_type & 0x7f;
985 dev->multifunction = !!(hdr_type & 0x80);
986 dev->error_state = pci_channel_io_normal;
987 set_pcie_port_type(dev);
989 list_for_each_entry(slot, &dev->bus->slots, list)
990 if (PCI_SLOT(dev->devfn) == slot->number)
993 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
994 set this higher, assuming the system even supports it. */
995 dev->dma_mask = 0xffffffff;
997 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
998 dev->bus->number, PCI_SLOT(dev->devfn),
999 PCI_FUNC(dev->devfn));
1001 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1002 dev->revision = class & 0xff;
1003 dev->class = class >> 8; /* upper 3 bytes */
1005 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1006 dev->vendor, dev->device, dev->hdr_type, dev->class);
1008 /* need to have dev->class ready */
1009 dev->cfg_size = pci_cfg_space_size(dev);
1011 /* "Unknown power state" */
1012 dev->current_state = PCI_UNKNOWN;
1014 /* Early fixups, before probing the BARs */
1015 pci_fixup_device(pci_fixup_early, dev);
1016 /* device class may be changed after fixup */
1017 class = dev->class >> 8;
1019 switch (dev->hdr_type) { /* header type */
1020 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1021 if (class == PCI_CLASS_BRIDGE_PCI)
1024 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1025 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1026 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1029 * Do the ugly legacy mode stuff here rather than broken chip
1030 * quirk code. Legacy mode ATA controllers have fixed
1031 * addresses. These are not always echoed in BAR0-3, and
1032 * BAR0-3 in a few cases contain junk!
1034 if (class == PCI_CLASS_STORAGE_IDE) {
1036 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1037 if ((progif & 1) == 0) {
1038 region.start = 0x1F0;
1040 res = &dev->resource[0];
1041 res->flags = LEGACY_IO_RESOURCE;
1042 pcibios_bus_to_resource(dev, res, ®ion);
1043 region.start = 0x3F6;
1045 res = &dev->resource[1];
1046 res->flags = LEGACY_IO_RESOURCE;
1047 pcibios_bus_to_resource(dev, res, ®ion);
1049 if ((progif & 4) == 0) {
1050 region.start = 0x170;
1052 res = &dev->resource[2];
1053 res->flags = LEGACY_IO_RESOURCE;
1054 pcibios_bus_to_resource(dev, res, ®ion);
1055 region.start = 0x376;
1057 res = &dev->resource[3];
1058 res->flags = LEGACY_IO_RESOURCE;
1059 pcibios_bus_to_resource(dev, res, ®ion);
1064 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1065 if (class != PCI_CLASS_BRIDGE_PCI)
1067 /* The PCI-to-PCI bridge spec requires that subtractive
1068 decoding (i.e. transparent) bridge must have programming
1069 interface code of 0x01. */
1071 dev->transparent = ((dev->class & 0xff) == 1);
1072 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1073 set_pcie_hotplug_bridge(dev);
1074 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1076 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1077 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1081 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1082 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1085 pci_read_bases(dev, 1, 0);
1086 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1087 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1090 default: /* unknown header */
1091 dev_err(&dev->dev, "unknown header type %02x, "
1092 "ignoring device\n", dev->hdr_type);
1096 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header "
1097 "type %02x)\n", dev->class, dev->hdr_type);
1098 dev->class = PCI_CLASS_NOT_DEFINED;
1101 /* We found a fine healthy device, go go go... */
1105 static void pci_release_capabilities(struct pci_dev *dev)
1107 pci_vpd_release(dev);
1108 pci_iov_release(dev);
1109 pci_free_cap_save_buffers(dev);
1113 * pci_release_dev - free a pci device structure when all users of it are finished.
1114 * @dev: device that's been disconnected
1116 * Will be called only by the device core when all users of this pci device are
1119 static void pci_release_dev(struct device *dev)
1121 struct pci_dev *pci_dev;
1123 pci_dev = to_pci_dev(dev);
1124 pci_release_capabilities(pci_dev);
1125 pci_release_of_node(pci_dev);
1130 * pci_cfg_space_size - get the configuration space size of the PCI device.
1133 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1134 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1135 * access it. Maybe we don't have a way to generate extended config space
1136 * accesses, or the device is behind a reverse Express bridge. So we try
1137 * reading the dword at 0x100 which must either be 0 or a valid extended
1138 * capability header.
1140 int pci_cfg_space_size_ext(struct pci_dev *dev)
1143 int pos = PCI_CFG_SPACE_SIZE;
1145 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1147 if (status == 0xffffffff)
1150 return PCI_CFG_SPACE_EXP_SIZE;
1153 return PCI_CFG_SPACE_SIZE;
1156 int pci_cfg_space_size(struct pci_dev *dev)
1162 class = dev->class >> 8;
1163 if (class == PCI_CLASS_BRIDGE_HOST)
1164 return pci_cfg_space_size_ext(dev);
1166 pos = pci_pcie_cap(dev);
1168 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1172 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1173 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1177 return pci_cfg_space_size_ext(dev);
1180 return PCI_CFG_SPACE_SIZE;
1183 static void pci_release_bus_bridge_dev(struct device *dev)
1185 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
1187 if (bridge->release_fn)
1188 bridge->release_fn(bridge);
1190 pci_free_resource_list(&bridge->windows);
1195 struct pci_dev *alloc_pci_dev(void)
1197 struct pci_dev *dev;
1199 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1203 INIT_LIST_HEAD(&dev->bus_list);
1207 EXPORT_SYMBOL(alloc_pci_dev);
1209 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1214 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1217 /* some broken boards return 0 or ~0 if a slot is empty: */
1218 if (*l == 0xffffffff || *l == 0x00000000 ||
1219 *l == 0x0000ffff || *l == 0xffff0000)
1222 /* Configuration request Retry Status */
1223 while (*l == 0xffff0001) {
1229 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1231 /* Card hasn't responded in 60 seconds? Must be stuck. */
1232 if (delay > crs_timeout) {
1233 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1234 "responding\n", pci_domain_nr(bus),
1235 bus->number, PCI_SLOT(devfn),
1243 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1246 * Read the config data for a PCI device, sanity-check it
1247 * and fill in the dev structure...
1249 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1251 struct pci_dev *dev;
1254 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1257 dev = alloc_pci_dev();
1263 dev->vendor = l & 0xffff;
1264 dev->device = (l >> 16) & 0xffff;
1266 pci_set_of_node(dev);
1268 if (pci_setup_device(dev)) {
1276 static void pci_init_capabilities(struct pci_dev *dev)
1278 /* MSI/MSI-X list */
1279 pci_msi_init_pci_dev(dev);
1281 /* Buffers for saving PCIe and PCI-X capabilities */
1282 pci_allocate_cap_save_buffers(dev);
1284 /* Power Management */
1286 platform_pci_wakeup_init(dev);
1288 /* Vital Product Data */
1289 pci_vpd_pci22_init(dev);
1291 /* Alternative Routing-ID Forwarding */
1292 pci_enable_ari(dev);
1294 /* Single Root I/O Virtualization */
1297 /* Enable ACS P2P upstream forwarding */
1298 pci_enable_acs(dev);
1301 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1303 device_initialize(&dev->dev);
1304 dev->dev.release = pci_release_dev;
1307 dev->dev.dma_mask = &dev->dma_mask;
1308 dev->dev.dma_parms = &dev->dma_parms;
1309 dev->dev.coherent_dma_mask = 0xffffffffull;
1311 pci_set_dma_max_seg_size(dev, 65536);
1312 pci_set_dma_seg_boundary(dev, 0xffffffff);
1314 /* Fix up broken headers */
1315 pci_fixup_device(pci_fixup_header, dev);
1317 /* moved out from quirk header fixup code */
1318 pci_reassigndev_resource_alignment(dev);
1320 /* Clear the state_saved flag. */
1321 dev->state_saved = false;
1323 /* Initialize various capabilities */
1324 pci_init_capabilities(dev);
1327 * Add the device to our list of discovered devices
1328 * and the bus list for fixup functions, etc.
1330 down_write(&pci_bus_sem);
1331 list_add_tail(&dev->bus_list, &bus->devices);
1332 up_write(&pci_bus_sem);
1335 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1337 struct pci_dev *dev;
1339 dev = pci_get_slot(bus, devfn);
1345 dev = pci_scan_device(bus, devfn);
1349 pci_device_add(dev, bus);
1353 EXPORT_SYMBOL(pci_scan_single_device);
1355 static unsigned next_ari_fn(struct pci_dev *dev, unsigned fn)
1358 unsigned pos, next_fn;
1363 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1366 pci_read_config_word(dev, pos + 4, &cap);
1373 static unsigned next_trad_fn(struct pci_dev *dev, unsigned fn)
1375 return (fn + 1) % 8;
1378 static unsigned no_next_fn(struct pci_dev *dev, unsigned fn)
1383 static int only_one_child(struct pci_bus *bus)
1385 struct pci_dev *parent = bus->self;
1387 if (!parent || !pci_is_pcie(parent))
1389 if (parent->pcie_type == PCI_EXP_TYPE_ROOT_PORT)
1391 if (parent->pcie_type == PCI_EXP_TYPE_DOWNSTREAM &&
1392 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1398 * pci_scan_slot - scan a PCI slot on a bus for devices.
1399 * @bus: PCI bus to scan
1400 * @devfn: slot number to scan (must have zero function.)
1402 * Scan a PCI slot on the specified PCI bus for devices, adding
1403 * discovered devices to the @bus->devices list. New devices
1404 * will not have is_added set.
1406 * Returns the number of new devices found.
1408 int pci_scan_slot(struct pci_bus *bus, int devfn)
1410 unsigned fn, nr = 0;
1411 struct pci_dev *dev;
1412 unsigned (*next_fn)(struct pci_dev *, unsigned) = no_next_fn;
1414 if (only_one_child(bus) && (devfn > 0))
1415 return 0; /* Already scanned the entire slot */
1417 dev = pci_scan_single_device(bus, devfn);
1423 if (pci_ari_enabled(bus))
1424 next_fn = next_ari_fn;
1425 else if (dev->multifunction)
1426 next_fn = next_trad_fn;
1428 for (fn = next_fn(dev, 0); fn > 0; fn = next_fn(dev, fn)) {
1429 dev = pci_scan_single_device(bus, devfn + fn);
1433 dev->multifunction = 1;
1437 /* only one slot has pcie device */
1438 if (bus->self && nr)
1439 pcie_aspm_init_link_state(bus->self);
1444 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1448 if (!pci_is_pcie(dev))
1451 /* For PCIE hotplug enabled slots not connected directly to a
1452 * PCI-E root port, there can be problems when hotplugging
1453 * devices. This is due to the possibility of hotplugging a
1454 * device into the fabric with a smaller MPS that the devices
1455 * currently running have configured. Modifying the MPS on the
1456 * running devices could cause a fatal bus error due to an
1457 * incoming frame being larger than the newly configured MPS.
1458 * To work around this, the MPS for the entire fabric must be
1459 * set to the minimum size. Any devices hotplugged into this
1460 * fabric will have the minimum MPS set. If the PCI hotplug
1461 * slot is directly connected to the root port and there are not
1462 * other devices on the fabric (which seems to be the most
1463 * common case), then this is not an issue and MPS discovery
1464 * will occur as normal.
1466 if (dev->is_hotplug_bridge && (!list_is_singular(&dev->bus->devices) ||
1468 dev->bus->self->pcie_type != PCI_EXP_TYPE_ROOT_PORT)))
1471 if (*smpss > dev->pcie_mpss)
1472 *smpss = dev->pcie_mpss;
1477 static void pcie_write_mps(struct pci_dev *dev, int mps)
1481 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1482 mps = 128 << dev->pcie_mpss;
1484 if (dev->pcie_type != PCI_EXP_TYPE_ROOT_PORT && dev->bus->self)
1485 /* For "Performance", the assumption is made that
1486 * downstream communication will never be larger than
1487 * the MRRS. So, the MPS only needs to be configured
1488 * for the upstream communication. This being the case,
1489 * walk from the top down and set the MPS of the child
1490 * to that of the parent bus.
1492 * Configure the device MPS with the smaller of the
1493 * device MPSS or the bridge MPS (which is assumed to be
1494 * properly configured at this point to the largest
1495 * allowable MPS based on its parent bus).
1497 mps = min(mps, pcie_get_mps(dev->bus->self));
1500 rc = pcie_set_mps(dev, mps);
1502 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1505 static void pcie_write_mrrs(struct pci_dev *dev)
1509 /* In the "safe" case, do not configure the MRRS. There appear to be
1510 * issues with setting MRRS to 0 on a number of devices.
1512 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1515 /* For Max performance, the MRRS must be set to the largest supported
1516 * value. However, it cannot be configured larger than the MPS the
1517 * device or the bus can support. This should already be properly
1518 * configured by a prior call to pcie_write_mps.
1520 mrrs = pcie_get_mps(dev);
1522 /* MRRS is a R/W register. Invalid values can be written, but a
1523 * subsequent read will verify if the value is acceptable or not.
1524 * If the MRRS value provided is not acceptable (e.g., too large),
1525 * shrink the value until it is acceptable to the HW.
1527 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1528 rc = pcie_set_readrq(dev, mrrs);
1532 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1537 dev_err(&dev->dev, "MRRS was unable to be configured with a "
1538 "safe value. If problems are experienced, try running "
1539 "with pci=pcie_bus_safe.\n");
1542 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1546 if (!pci_is_pcie(dev))
1549 mps = 128 << *(u8 *)data;
1550 orig_mps = pcie_get_mps(dev);
1552 pcie_write_mps(dev, mps);
1553 pcie_write_mrrs(dev);
1555 dev_info(&dev->dev, "PCI-E Max Payload Size set to %4d/%4d (was %4d), "
1556 "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss,
1557 orig_mps, pcie_get_readrq(dev));
1562 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1563 * parents then children fashion. If this changes, then this code will not
1566 void pcie_bus_configure_settings(struct pci_bus *bus, u8 mpss)
1570 if (!pci_is_pcie(bus->self))
1573 if (pcie_bus_config == PCIE_BUS_TUNE_OFF)
1576 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1577 * to be aware to the MPS of the destination. To work around this,
1578 * simply force the MPS of the entire system to the smallest possible.
1580 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1583 if (pcie_bus_config == PCIE_BUS_SAFE) {
1586 pcie_find_smpss(bus->self, &smpss);
1587 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1590 pcie_bus_configure_set(bus->self, &smpss);
1591 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1593 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1595 unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus)
1597 unsigned int devfn, pass, max = bus->busn_res.start;
1598 struct pci_dev *dev;
1600 dev_dbg(&bus->dev, "scanning bus\n");
1602 /* Go find them, Rover! */
1603 for (devfn = 0; devfn < 0x100; devfn += 8)
1604 pci_scan_slot(bus, devfn);
1606 /* Reserve buses for SR-IOV capability. */
1607 max += pci_iov_bus_range(bus);
1610 * After performing arch-dependent fixup of the bus, look behind
1611 * all PCI-to-PCI bridges on this bus.
1613 if (!bus->is_added) {
1614 dev_dbg(&bus->dev, "fixups for bus\n");
1615 pcibios_fixup_bus(bus);
1616 if (pci_is_root_bus(bus))
1620 for (pass=0; pass < 2; pass++)
1621 list_for_each_entry(dev, &bus->devices, bus_list) {
1622 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1623 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1624 max = pci_scan_bridge(bus, dev, max, pass);
1628 * We've scanned the bus and so we know all about what's on
1629 * the other side of any bridges that may be on this bus plus
1632 * Return how far we've got finding sub-buses.
1634 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1638 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
1639 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1642 struct pci_host_bridge *bridge;
1643 struct pci_bus *b, *b2;
1644 struct pci_host_bridge_window *window, *n;
1645 struct resource *res;
1646 resource_size_t offset;
1651 b = pci_alloc_bus();
1655 b->sysdata = sysdata;
1657 b2 = pci_find_bus(pci_domain_nr(b), bus);
1659 /* If we already got to this bus through a different bridge, ignore it */
1660 dev_dbg(&b2->dev, "bus already known\n");
1664 bridge = pci_alloc_host_bridge(b);
1668 bridge->dev.parent = parent;
1669 bridge->dev.release = pci_release_bus_bridge_dev;
1670 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1671 error = device_register(&bridge->dev);
1673 goto bridge_dev_reg_err;
1674 b->bridge = get_device(&bridge->dev);
1675 device_enable_async_suspend(b->bridge);
1676 pci_set_bus_of_node(b);
1679 set_dev_node(b->bridge, pcibus_to_node(b));
1681 b->dev.class = &pcibus_class;
1682 b->dev.parent = b->bridge;
1683 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1684 error = device_register(&b->dev);
1686 goto class_dev_reg_err;
1688 /* Create legacy_io and legacy_mem files for this bus */
1689 pci_create_legacy_files(b);
1691 b->number = b->busn_res.start = bus;
1694 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
1696 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
1698 /* Add initial resources to the bus */
1699 list_for_each_entry_safe(window, n, resources, list) {
1700 list_move_tail(&window->list, &bridge->windows);
1702 offset = window->offset;
1703 if (res->flags & IORESOURCE_BUS)
1704 pci_bus_insert_busn_res(b, bus, res->end);
1706 pci_bus_add_resource(b, res, 0);
1708 if (resource_type(res) == IORESOURCE_IO)
1709 fmt = " (bus address [%#06llx-%#06llx])";
1711 fmt = " (bus address [%#010llx-%#010llx])";
1712 snprintf(bus_addr, sizeof(bus_addr), fmt,
1713 (unsigned long long) (res->start - offset),
1714 (unsigned long long) (res->end - offset));
1717 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
1720 down_write(&pci_bus_sem);
1721 list_add_tail(&b->node, &pci_root_buses);
1722 up_write(&pci_bus_sem);
1727 put_device(&bridge->dev);
1728 device_unregister(&bridge->dev);
1736 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
1738 struct resource *res = &b->busn_res;
1739 struct resource *parent_res, *conflict;
1743 res->flags = IORESOURCE_BUS;
1745 if (!pci_is_root_bus(b))
1746 parent_res = &b->parent->busn_res;
1748 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
1749 res->flags |= IORESOURCE_PCI_FIXED;
1752 conflict = insert_resource_conflict(parent_res, res);
1755 dev_printk(KERN_DEBUG, &b->dev,
1756 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
1757 res, pci_is_root_bus(b) ? "domain " : "",
1758 parent_res, conflict->name, conflict);
1760 dev_printk(KERN_DEBUG, &b->dev,
1761 "busn_res: %pR is inserted under %s%pR\n",
1762 res, pci_is_root_bus(b) ? "domain " : "",
1765 return conflict == NULL;
1768 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
1770 struct resource *res = &b->busn_res;
1771 struct resource old_res = *res;
1772 resource_size_t size;
1775 if (res->start > bus_max)
1778 size = bus_max - res->start + 1;
1779 ret = adjust_resource(res, res->start, size);
1780 dev_printk(KERN_DEBUG, &b->dev,
1781 "busn_res: %pR end %s updated to %02x\n",
1782 &old_res, ret ? "can not be" : "is", bus_max);
1784 if (!ret && !res->parent)
1785 pci_bus_insert_busn_res(b, res->start, res->end);
1790 void pci_bus_release_busn_res(struct pci_bus *b)
1792 struct resource *res = &b->busn_res;
1795 if (!res->flags || !res->parent)
1798 ret = release_resource(res);
1799 dev_printk(KERN_DEBUG, &b->dev,
1800 "busn_res: %pR %s released\n",
1801 res, ret ? "can not be" : "is");
1804 struct pci_bus * __devinit pci_scan_root_bus(struct device *parent, int bus,
1805 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1807 struct pci_host_bridge_window *window;
1812 list_for_each_entry(window, resources, list)
1813 if (window->res->flags & IORESOURCE_BUS) {
1818 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
1824 "No busn resource found for root bus, will use [bus %02x-ff]\n",
1826 pci_bus_insert_busn_res(b, bus, 255);
1829 max = pci_scan_child_bus(b);
1832 pci_bus_update_busn_res_end(b, max);
1834 pci_bus_add_devices(b);
1837 EXPORT_SYMBOL(pci_scan_root_bus);
1839 /* Deprecated; use pci_scan_root_bus() instead */
1840 struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent,
1841 int bus, struct pci_ops *ops, void *sysdata)
1843 LIST_HEAD(resources);
1846 pci_add_resource(&resources, &ioport_resource);
1847 pci_add_resource(&resources, &iomem_resource);
1848 pci_add_resource(&resources, &busn_resource);
1849 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
1851 pci_scan_child_bus(b);
1853 pci_free_resource_list(&resources);
1856 EXPORT_SYMBOL(pci_scan_bus_parented);
1858 struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
1861 LIST_HEAD(resources);
1864 pci_add_resource(&resources, &ioport_resource);
1865 pci_add_resource(&resources, &iomem_resource);
1866 pci_add_resource(&resources, &busn_resource);
1867 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
1869 pci_scan_child_bus(b);
1870 pci_bus_add_devices(b);
1872 pci_free_resource_list(&resources);
1876 EXPORT_SYMBOL(pci_scan_bus);
1878 #ifdef CONFIG_HOTPLUG
1880 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
1881 * @bridge: PCI bridge for the bus to scan
1883 * Scan a PCI bus and child buses for new devices, add them,
1884 * and enable them, resizing bridge mmio/io resource if necessary
1885 * and possible. The caller must ensure the child devices are already
1886 * removed for resizing to occur.
1888 * Returns the max number of subordinate bus discovered.
1890 unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
1893 struct pci_bus *bus = bridge->subordinate;
1895 max = pci_scan_child_bus(bus);
1897 pci_assign_unassigned_bridge_resources(bridge);
1899 pci_bus_add_devices(bus);
1904 EXPORT_SYMBOL(pci_add_new_bus);
1905 EXPORT_SYMBOL(pci_scan_slot);
1906 EXPORT_SYMBOL(pci_scan_bridge);
1907 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1910 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
1912 const struct pci_dev *a = to_pci_dev(d_a);
1913 const struct pci_dev *b = to_pci_dev(d_b);
1915 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
1916 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
1918 if (a->bus->number < b->bus->number) return -1;
1919 else if (a->bus->number > b->bus->number) return 1;
1921 if (a->devfn < b->devfn) return -1;
1922 else if (a->devfn > b->devfn) return 1;
1927 void __init pci_sort_breadthfirst(void)
1929 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);