2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/of_device.h>
10 #include <linux/of_pci.h>
11 #include <linux/pci_hotplug.h>
12 #include <linux/slab.h>
13 #include <linux/module.h>
14 #include <linux/cpumask.h>
15 #include <linux/pci-aspm.h>
16 #include <linux/aer.h>
17 #include <linux/acpi.h>
18 #include <linux/irqdomain.h>
19 #include <linux/pm_runtime.h>
22 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
23 #define CARDBUS_RESERVE_BUSNR 3
25 static struct resource busn_resource = {
29 .flags = IORESOURCE_BUS,
32 /* Ugh. Need to stop exporting this to modules. */
33 LIST_HEAD(pci_root_buses);
34 EXPORT_SYMBOL(pci_root_buses);
36 static LIST_HEAD(pci_domain_busn_res_list);
38 struct pci_domain_busn_res {
39 struct list_head list;
44 static struct resource *get_pci_domain_busn_res(int domain_nr)
46 struct pci_domain_busn_res *r;
48 list_for_each_entry(r, &pci_domain_busn_res_list, list)
49 if (r->domain_nr == domain_nr)
52 r = kzalloc(sizeof(*r), GFP_KERNEL);
56 r->domain_nr = domain_nr;
59 r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
61 list_add_tail(&r->list, &pci_domain_busn_res_list);
66 static int find_anything(struct device *dev, void *data)
72 * Some device drivers need know if pci is initiated.
73 * Basically, we think pci is not initiated when there
74 * is no device to be found on the pci_bus_type.
76 int no_pci_devices(void)
81 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
82 no_devices = (dev == NULL);
86 EXPORT_SYMBOL(no_pci_devices);
91 static void release_pcibus_dev(struct device *dev)
93 struct pci_bus *pci_bus = to_pci_bus(dev);
95 put_device(pci_bus->bridge);
96 pci_bus_remove_resources(pci_bus);
97 pci_release_bus_of_node(pci_bus);
101 static struct class pcibus_class = {
103 .dev_release = &release_pcibus_dev,
104 .dev_groups = pcibus_groups,
107 static int __init pcibus_class_init(void)
109 return class_register(&pcibus_class);
111 postcore_initcall(pcibus_class_init);
113 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
115 u64 size = mask & maxbase; /* Find the significant bits */
119 /* Get the lowest of them to find the decode size, and
120 from that the extent. */
121 size = (size & ~(size-1)) - 1;
123 /* base == maxbase can be valid only if the BAR has
124 already been programmed with all 1s. */
125 if (base == maxbase && ((base | size) & mask) != mask)
131 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
136 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
137 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
138 flags |= IORESOURCE_IO;
142 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
143 flags |= IORESOURCE_MEM;
144 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
145 flags |= IORESOURCE_PREFETCH;
147 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
149 case PCI_BASE_ADDRESS_MEM_TYPE_32:
151 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
152 /* 1M mem BAR treated as 32-bit BAR */
154 case PCI_BASE_ADDRESS_MEM_TYPE_64:
155 flags |= IORESOURCE_MEM_64;
158 /* mem unknown type treated as 32-bit BAR */
164 #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
167 * pci_read_base - read a PCI BAR
168 * @dev: the PCI device
169 * @type: type of the BAR
170 * @res: resource buffer to be filled in
171 * @pos: BAR position in the config space
173 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
175 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
176 struct resource *res, unsigned int pos)
178 u32 l = 0, sz = 0, mask;
179 u64 l64, sz64, mask64;
181 struct pci_bus_region region, inverted_region;
183 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
185 /* No printks while decoding is disabled! */
186 if (!dev->mmio_always_on) {
187 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
188 if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) {
189 pci_write_config_word(dev, PCI_COMMAND,
190 orig_cmd & ~PCI_COMMAND_DECODE_ENABLE);
194 res->name = pci_name(dev);
196 pci_read_config_dword(dev, pos, &l);
197 pci_write_config_dword(dev, pos, l | mask);
198 pci_read_config_dword(dev, pos, &sz);
199 pci_write_config_dword(dev, pos, l);
202 * All bits set in sz means the device isn't working properly.
203 * If the BAR isn't implemented, all bits must be 0. If it's a
204 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
207 if (sz == 0xffffffff)
211 * I don't know how l can have all bits set. Copied from old code.
212 * Maybe it fixes a bug on some ancient platform.
217 if (type == pci_bar_unknown) {
218 res->flags = decode_bar(dev, l);
219 res->flags |= IORESOURCE_SIZEALIGN;
220 if (res->flags & IORESOURCE_IO) {
221 l64 = l & PCI_BASE_ADDRESS_IO_MASK;
222 sz64 = sz & PCI_BASE_ADDRESS_IO_MASK;
223 mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT;
225 l64 = l & PCI_BASE_ADDRESS_MEM_MASK;
226 sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK;
227 mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK;
230 if (l & PCI_ROM_ADDRESS_ENABLE)
231 res->flags |= IORESOURCE_ROM_ENABLE;
232 l64 = l & PCI_ROM_ADDRESS_MASK;
233 sz64 = sz & PCI_ROM_ADDRESS_MASK;
234 mask64 = PCI_ROM_ADDRESS_MASK;
237 if (res->flags & IORESOURCE_MEM_64) {
238 pci_read_config_dword(dev, pos + 4, &l);
239 pci_write_config_dword(dev, pos + 4, ~0);
240 pci_read_config_dword(dev, pos + 4, &sz);
241 pci_write_config_dword(dev, pos + 4, l);
243 l64 |= ((u64)l << 32);
244 sz64 |= ((u64)sz << 32);
245 mask64 |= ((u64)~0 << 32);
248 if (!dev->mmio_always_on && (orig_cmd & PCI_COMMAND_DECODE_ENABLE))
249 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
254 sz64 = pci_size(l64, sz64, mask64);
256 dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n",
261 if (res->flags & IORESOURCE_MEM_64) {
262 if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8)
263 && sz64 > 0x100000000ULL) {
264 res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
267 dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
268 pos, (unsigned long long)sz64);
272 if ((sizeof(pci_bus_addr_t) < 8) && l) {
273 /* Above 32-bit boundary; try to reallocate */
274 res->flags |= IORESOURCE_UNSET;
277 dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n",
278 pos, (unsigned long long)l64);
284 region.end = l64 + sz64;
286 pcibios_bus_to_resource(dev->bus, res, ®ion);
287 pcibios_resource_to_bus(dev->bus, &inverted_region, res);
290 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
291 * the corresponding resource address (the physical address used by
292 * the CPU. Converting that resource address back to a bus address
293 * should yield the original BAR value:
295 * resource_to_bus(bus_to_resource(A)) == A
297 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not
298 * be claimed by the device.
300 if (inverted_region.start != region.start) {
301 res->flags |= IORESOURCE_UNSET;
303 res->end = region.end - region.start;
304 dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n",
305 pos, (unsigned long long)region.start);
315 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
317 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
320 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
322 unsigned int pos, reg;
324 if (dev->non_compliant_bars)
327 for (pos = 0; pos < howmany; pos++) {
328 struct resource *res = &dev->resource[pos];
329 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
330 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
334 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
335 dev->rom_base_reg = rom;
336 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
337 IORESOURCE_READONLY | IORESOURCE_SIZEALIGN;
338 __pci_read_base(dev, pci_bar_mem32, res, rom);
342 static void pci_read_bridge_io(struct pci_bus *child)
344 struct pci_dev *dev = child->self;
345 u8 io_base_lo, io_limit_lo;
346 unsigned long io_mask, io_granularity, base, limit;
347 struct pci_bus_region region;
348 struct resource *res;
350 io_mask = PCI_IO_RANGE_MASK;
351 io_granularity = 0x1000;
352 if (dev->io_window_1k) {
353 /* Support 1K I/O space granularity */
354 io_mask = PCI_IO_1K_RANGE_MASK;
355 io_granularity = 0x400;
358 res = child->resource[0];
359 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
360 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
361 base = (io_base_lo & io_mask) << 8;
362 limit = (io_limit_lo & io_mask) << 8;
364 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
365 u16 io_base_hi, io_limit_hi;
367 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
368 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
369 base |= ((unsigned long) io_base_hi << 16);
370 limit |= ((unsigned long) io_limit_hi << 16);
374 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
376 region.end = limit + io_granularity - 1;
377 pcibios_bus_to_resource(dev->bus, res, ®ion);
378 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
382 static void pci_read_bridge_mmio(struct pci_bus *child)
384 struct pci_dev *dev = child->self;
385 u16 mem_base_lo, mem_limit_lo;
386 unsigned long base, limit;
387 struct pci_bus_region region;
388 struct resource *res;
390 res = child->resource[1];
391 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
392 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
393 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
394 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
396 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
398 region.end = limit + 0xfffff;
399 pcibios_bus_to_resource(dev->bus, res, ®ion);
400 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
404 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
406 struct pci_dev *dev = child->self;
407 u16 mem_base_lo, mem_limit_lo;
409 pci_bus_addr_t base, limit;
410 struct pci_bus_region region;
411 struct resource *res;
413 res = child->resource[2];
414 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
415 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
416 base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
417 limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
419 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
420 u32 mem_base_hi, mem_limit_hi;
422 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
423 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
426 * Some bridges set the base > limit by default, and some
427 * (broken) BIOSes do not initialize them. If we find
428 * this, just assume they are not being used.
430 if (mem_base_hi <= mem_limit_hi) {
431 base64 |= (u64) mem_base_hi << 32;
432 limit64 |= (u64) mem_limit_hi << 32;
436 base = (pci_bus_addr_t) base64;
437 limit = (pci_bus_addr_t) limit64;
439 if (base != base64) {
440 dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
441 (unsigned long long) base64);
446 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
447 IORESOURCE_MEM | IORESOURCE_PREFETCH;
448 if (res->flags & PCI_PREF_RANGE_TYPE_64)
449 res->flags |= IORESOURCE_MEM_64;
451 region.end = limit + 0xfffff;
452 pcibios_bus_to_resource(dev->bus, res, ®ion);
453 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
457 void pci_read_bridge_bases(struct pci_bus *child)
459 struct pci_dev *dev = child->self;
460 struct resource *res;
463 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
466 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
468 dev->transparent ? " (subtractive decode)" : "");
470 pci_bus_remove_resources(child);
471 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
472 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
474 pci_read_bridge_io(child);
475 pci_read_bridge_mmio(child);
476 pci_read_bridge_mmio_pref(child);
478 if (dev->transparent) {
479 pci_bus_for_each_resource(child->parent, res, i) {
480 if (res && res->flags) {
481 pci_bus_add_resource(child, res,
482 PCI_SUBTRACTIVE_DECODE);
483 dev_printk(KERN_DEBUG, &dev->dev,
484 " bridge window %pR (subtractive decode)\n",
491 static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
495 b = kzalloc(sizeof(*b), GFP_KERNEL);
499 INIT_LIST_HEAD(&b->node);
500 INIT_LIST_HEAD(&b->children);
501 INIT_LIST_HEAD(&b->devices);
502 INIT_LIST_HEAD(&b->slots);
503 INIT_LIST_HEAD(&b->resources);
504 b->max_bus_speed = PCI_SPEED_UNKNOWN;
505 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
506 #ifdef CONFIG_PCI_DOMAINS_GENERIC
508 b->domain_nr = parent->domain_nr;
513 static void devm_pci_release_host_bridge_dev(struct device *dev)
515 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
517 if (bridge->release_fn)
518 bridge->release_fn(bridge);
521 static void pci_release_host_bridge_dev(struct device *dev)
523 devm_pci_release_host_bridge_dev(dev);
524 pci_free_host_bridge(to_pci_host_bridge(dev));
527 struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
529 struct pci_host_bridge *bridge;
531 bridge = kzalloc(sizeof(*bridge) + priv, GFP_KERNEL);
535 INIT_LIST_HEAD(&bridge->windows);
536 bridge->dev.release = pci_release_host_bridge_dev;
540 EXPORT_SYMBOL(pci_alloc_host_bridge);
542 struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
545 struct pci_host_bridge *bridge;
547 bridge = devm_kzalloc(dev, sizeof(*bridge) + priv, GFP_KERNEL);
551 INIT_LIST_HEAD(&bridge->windows);
552 bridge->dev.release = devm_pci_release_host_bridge_dev;
556 EXPORT_SYMBOL(devm_pci_alloc_host_bridge);
558 void pci_free_host_bridge(struct pci_host_bridge *bridge)
560 pci_free_resource_list(&bridge->windows);
564 EXPORT_SYMBOL(pci_free_host_bridge);
566 static const unsigned char pcix_bus_speed[] = {
567 PCI_SPEED_UNKNOWN, /* 0 */
568 PCI_SPEED_66MHz_PCIX, /* 1 */
569 PCI_SPEED_100MHz_PCIX, /* 2 */
570 PCI_SPEED_133MHz_PCIX, /* 3 */
571 PCI_SPEED_UNKNOWN, /* 4 */
572 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
573 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
574 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
575 PCI_SPEED_UNKNOWN, /* 8 */
576 PCI_SPEED_66MHz_PCIX_266, /* 9 */
577 PCI_SPEED_100MHz_PCIX_266, /* A */
578 PCI_SPEED_133MHz_PCIX_266, /* B */
579 PCI_SPEED_UNKNOWN, /* C */
580 PCI_SPEED_66MHz_PCIX_533, /* D */
581 PCI_SPEED_100MHz_PCIX_533, /* E */
582 PCI_SPEED_133MHz_PCIX_533 /* F */
585 const unsigned char pcie_link_speed[] = {
586 PCI_SPEED_UNKNOWN, /* 0 */
587 PCIE_SPEED_2_5GT, /* 1 */
588 PCIE_SPEED_5_0GT, /* 2 */
589 PCIE_SPEED_8_0GT, /* 3 */
590 PCI_SPEED_UNKNOWN, /* 4 */
591 PCI_SPEED_UNKNOWN, /* 5 */
592 PCI_SPEED_UNKNOWN, /* 6 */
593 PCI_SPEED_UNKNOWN, /* 7 */
594 PCI_SPEED_UNKNOWN, /* 8 */
595 PCI_SPEED_UNKNOWN, /* 9 */
596 PCI_SPEED_UNKNOWN, /* A */
597 PCI_SPEED_UNKNOWN, /* B */
598 PCI_SPEED_UNKNOWN, /* C */
599 PCI_SPEED_UNKNOWN, /* D */
600 PCI_SPEED_UNKNOWN, /* E */
601 PCI_SPEED_UNKNOWN /* F */
604 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
606 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
608 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
610 static unsigned char agp_speeds[] = {
618 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
624 else if (agpstat & 2)
626 else if (agpstat & 1)
638 return agp_speeds[index];
641 static void pci_set_bus_speed(struct pci_bus *bus)
643 struct pci_dev *bridge = bus->self;
646 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
648 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
652 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
653 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
655 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
656 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
659 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
662 enum pci_bus_speed max;
664 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
667 if (status & PCI_X_SSTATUS_533MHZ) {
668 max = PCI_SPEED_133MHz_PCIX_533;
669 } else if (status & PCI_X_SSTATUS_266MHZ) {
670 max = PCI_SPEED_133MHz_PCIX_266;
671 } else if (status & PCI_X_SSTATUS_133MHZ) {
672 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
673 max = PCI_SPEED_133MHz_PCIX_ECC;
675 max = PCI_SPEED_133MHz_PCIX;
677 max = PCI_SPEED_66MHz_PCIX;
680 bus->max_bus_speed = max;
681 bus->cur_bus_speed = pcix_bus_speed[
682 (status & PCI_X_SSTATUS_FREQ) >> 6];
687 if (pci_is_pcie(bridge)) {
691 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
692 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
694 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
695 pcie_update_link_speed(bus, linksta);
699 static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
701 struct irq_domain *d;
704 * Any firmware interface that can resolve the msi_domain
705 * should be called from here.
707 d = pci_host_bridge_of_msi_domain(bus);
709 d = pci_host_bridge_acpi_msi_domain(bus);
711 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
713 * If no IRQ domain was found via the OF tree, try looking it up
714 * directly through the fwnode_handle.
717 struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
720 d = irq_find_matching_fwnode(fwnode,
728 static void pci_set_bus_msi_domain(struct pci_bus *bus)
730 struct irq_domain *d;
734 * The bus can be a root bus, a subordinate bus, or a virtual bus
735 * created by an SR-IOV device. Walk up to the first bridge device
736 * found or derive the domain from the host bridge.
738 for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) {
740 d = dev_get_msi_domain(&b->self->dev);
744 d = pci_host_bridge_msi_domain(b);
746 dev_set_msi_domain(&bus->dev, d);
749 int pci_register_host_bridge(struct pci_host_bridge *bridge)
751 struct device *parent = bridge->dev.parent;
752 struct resource_entry *window, *n;
753 struct pci_bus *bus, *b;
754 resource_size_t offset;
755 LIST_HEAD(resources);
756 struct resource *res;
761 bus = pci_alloc_bus(NULL);
767 /* temporarily move resources off the list */
768 list_splice_init(&bridge->windows, &resources);
769 bus->sysdata = bridge->sysdata;
770 bus->msi = bridge->msi;
771 bus->ops = bridge->ops;
772 bus->number = bus->busn_res.start = bridge->busnr;
773 #ifdef CONFIG_PCI_DOMAINS_GENERIC
774 bus->domain_nr = pci_bus_find_domain_nr(bus, parent);
777 b = pci_find_bus(pci_domain_nr(bus), bridge->busnr);
779 /* If we already got to this bus through a different bridge, ignore it */
780 dev_dbg(&b->dev, "bus already known\n");
785 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(bus),
788 err = pcibios_root_bridge_prepare(bridge);
792 err = device_register(&bridge->dev);
794 put_device(&bridge->dev);
796 bus->bridge = get_device(&bridge->dev);
797 device_enable_async_suspend(bus->bridge);
798 pci_set_bus_of_node(bus);
799 pci_set_bus_msi_domain(bus);
802 set_dev_node(bus->bridge, pcibus_to_node(bus));
804 bus->dev.class = &pcibus_class;
805 bus->dev.parent = bus->bridge;
807 dev_set_name(&bus->dev, "%04x:%02x", pci_domain_nr(bus), bus->number);
808 name = dev_name(&bus->dev);
810 err = device_register(&bus->dev);
814 pcibios_add_bus(bus);
816 /* Create legacy_io and legacy_mem files for this bus */
817 pci_create_legacy_files(bus);
820 dev_info(parent, "PCI host bridge to bus %s\n", name);
822 pr_info("PCI host bridge to bus %s\n", name);
824 /* Add initial resources to the bus */
825 resource_list_for_each_entry_safe(window, n, &resources) {
826 list_move_tail(&window->node, &bridge->windows);
827 offset = window->offset;
830 if (res->flags & IORESOURCE_BUS)
831 pci_bus_insert_busn_res(bus, bus->number, res->end);
833 pci_bus_add_resource(bus, res, 0);
836 if (resource_type(res) == IORESOURCE_IO)
837 fmt = " (bus address [%#06llx-%#06llx])";
839 fmt = " (bus address [%#010llx-%#010llx])";
841 snprintf(addr, sizeof(addr), fmt,
842 (unsigned long long)(res->start - offset),
843 (unsigned long long)(res->end - offset));
847 dev_info(&bus->dev, "root bus resource %pR%s\n", res, addr);
850 down_write(&pci_bus_sem);
851 list_add_tail(&bus->node, &pci_root_buses);
852 up_write(&pci_bus_sem);
857 put_device(&bridge->dev);
858 device_unregister(&bridge->dev);
864 EXPORT_SYMBOL(pci_register_host_bridge);
866 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
867 struct pci_dev *bridge, int busnr)
869 struct pci_bus *child;
874 * Allocate a new bus, and inherit stuff from the parent..
876 child = pci_alloc_bus(parent);
880 child->parent = parent;
881 child->ops = parent->ops;
882 child->msi = parent->msi;
883 child->sysdata = parent->sysdata;
884 child->bus_flags = parent->bus_flags;
886 /* initialize some portions of the bus device, but don't register it
887 * now as the parent is not properly set up yet.
889 child->dev.class = &pcibus_class;
890 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
893 * Set up the primary, secondary and subordinate
896 child->number = child->busn_res.start = busnr;
897 child->primary = parent->busn_res.start;
898 child->busn_res.end = 0xff;
901 child->dev.parent = parent->bridge;
905 child->self = bridge;
906 child->bridge = get_device(&bridge->dev);
907 child->dev.parent = child->bridge;
908 pci_set_bus_of_node(child);
909 pci_set_bus_speed(child);
911 /* Set up default resource pointers and names.. */
912 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
913 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
914 child->resource[i]->name = child->name;
916 bridge->subordinate = child;
919 pci_set_bus_msi_domain(child);
920 ret = device_register(&child->dev);
923 pcibios_add_bus(child);
925 if (child->ops->add_bus) {
926 ret = child->ops->add_bus(child);
927 if (WARN_ON(ret < 0))
928 dev_err(&child->dev, "failed to add bus: %d\n", ret);
931 /* Create legacy_io and legacy_mem files for this bus */
932 pci_create_legacy_files(child);
937 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
940 struct pci_bus *child;
942 child = pci_alloc_child_bus(parent, dev, busnr);
944 down_write(&pci_bus_sem);
945 list_add_tail(&child->node, &parent->children);
946 up_write(&pci_bus_sem);
950 EXPORT_SYMBOL(pci_add_new_bus);
952 static void pci_enable_crs(struct pci_dev *pdev)
956 /* Enable CRS Software Visibility if supported */
957 pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap);
958 if (root_cap & PCI_EXP_RTCAP_CRSVIS)
959 pcie_capability_set_word(pdev, PCI_EXP_RTCTL,
960 PCI_EXP_RTCTL_CRSSVE);
964 * If it's a bridge, configure it and scan the bus behind it.
965 * For CardBus bridges, we don't scan behind as the devices will
966 * be handled by the bridge driver itself.
968 * We need to process bridges in two passes -- first we scan those
969 * already configured by the BIOS and after we are done with all of
970 * them, we proceed to assigning numbers to the remaining buses in
971 * order to avoid overlaps between old and new bus numbers.
973 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
975 struct pci_bus *child;
976 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
979 u8 primary, secondary, subordinate;
983 * Make sure the bridge is powered on to be able to access config
984 * space of devices below it.
986 pm_runtime_get_sync(&dev->dev);
988 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
989 primary = buses & 0xFF;
990 secondary = (buses >> 8) & 0xFF;
991 subordinate = (buses >> 16) & 0xFF;
993 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
994 secondary, subordinate, pass);
996 if (!primary && (primary != bus->number) && secondary && subordinate) {
997 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
998 primary = bus->number;
1001 /* Check if setup is sensible at all */
1003 (primary != bus->number || secondary <= bus->number ||
1004 secondary > subordinate)) {
1005 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
1006 secondary, subordinate);
1010 /* Disable MasterAbortMode during probing to avoid reporting
1011 of bus errors (in some architectures) */
1012 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
1013 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
1014 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
1016 pci_enable_crs(dev);
1018 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
1019 !is_cardbus && !broken) {
1022 * Bus already configured by firmware, process it in the first
1023 * pass and just note the configuration.
1029 * The bus might already exist for two reasons: Either we are
1030 * rescanning the bus or the bus is reachable through more than
1031 * one bridge. The second case can happen with the i450NX
1034 child = pci_find_bus(pci_domain_nr(bus), secondary);
1036 child = pci_add_new_bus(bus, dev, secondary);
1039 child->primary = primary;
1040 pci_bus_insert_busn_res(child, secondary, subordinate);
1041 child->bridge_ctl = bctl;
1044 cmax = pci_scan_child_bus(child);
1045 if (cmax > subordinate)
1046 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
1048 /* subordinate should equal child->busn_res.end */
1049 if (subordinate > max)
1053 * We need to assign a number to this bus which we always
1054 * do in the second pass.
1057 if (pcibios_assign_all_busses() || broken || is_cardbus)
1058 /* Temporarily disable forwarding of the
1059 configuration cycles on all bridges in
1060 this bus segment to avoid possible
1061 conflicts in the second pass between two
1062 bridges programmed with overlapping
1064 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
1070 pci_write_config_word(dev, PCI_STATUS, 0xffff);
1072 /* Prevent assigning a bus number that already exists.
1073 * This can happen when a bridge is hot-plugged, so in
1074 * this case we only re-scan this bus. */
1075 child = pci_find_bus(pci_domain_nr(bus), max+1);
1077 child = pci_add_new_bus(bus, dev, max+1);
1080 pci_bus_insert_busn_res(child, max+1, 0xff);
1083 buses = (buses & 0xff000000)
1084 | ((unsigned int)(child->primary) << 0)
1085 | ((unsigned int)(child->busn_res.start) << 8)
1086 | ((unsigned int)(child->busn_res.end) << 16);
1089 * yenta.c forces a secondary latency timer of 176.
1090 * Copy that behaviour here.
1093 buses &= ~0xff000000;
1094 buses |= CARDBUS_LATENCY_TIMER << 24;
1098 * We need to blast all three values with a single write.
1100 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
1103 child->bridge_ctl = bctl;
1104 max = pci_scan_child_bus(child);
1107 * For CardBus bridges, we leave 4 bus numbers
1108 * as cards with a PCI-to-PCI bridge can be
1111 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
1112 struct pci_bus *parent = bus;
1113 if (pci_find_bus(pci_domain_nr(bus),
1116 while (parent->parent) {
1117 if ((!pcibios_assign_all_busses()) &&
1118 (parent->busn_res.end > max) &&
1119 (parent->busn_res.end <= max+i)) {
1122 parent = parent->parent;
1126 * Often, there are two cardbus bridges
1127 * -- try to leave one valid bus number
1137 * Set the subordinate bus number to its real value.
1139 pci_bus_update_busn_res_end(child, max);
1140 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
1143 sprintf(child->name,
1144 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
1145 pci_domain_nr(bus), child->number);
1147 /* Has only triggered on CardBus, fixup is in yenta_socket */
1148 while (bus->parent) {
1149 if ((child->busn_res.end > bus->busn_res.end) ||
1150 (child->number > bus->busn_res.end) ||
1151 (child->number < bus->number) ||
1152 (child->busn_res.end < bus->number)) {
1153 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
1155 (bus->number > child->busn_res.end &&
1156 bus->busn_res.end < child->number) ?
1157 "wholly" : "partially",
1158 bus->self->transparent ? " transparent" : "",
1159 dev_name(&bus->dev),
1166 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
1168 pm_runtime_put(&dev->dev);
1172 EXPORT_SYMBOL(pci_scan_bridge);
1175 * Read interrupt line and base address registers.
1176 * The architecture-dependent code can tweak these, of course.
1178 static void pci_read_irq(struct pci_dev *dev)
1182 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
1185 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
1189 void set_pcie_port_type(struct pci_dev *pdev)
1194 struct pci_dev *parent;
1196 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1200 pdev->pcie_cap = pos;
1201 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
1202 pdev->pcie_flags_reg = reg16;
1203 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
1204 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
1207 * A Root Port or a PCI-to-PCIe bridge is always the upstream end
1208 * of a Link. No PCIe component has two Links. Two Links are
1209 * connected by a Switch that has a Port on each Link and internal
1210 * logic to connect the two Ports.
1212 type = pci_pcie_type(pdev);
1213 if (type == PCI_EXP_TYPE_ROOT_PORT ||
1214 type == PCI_EXP_TYPE_PCIE_BRIDGE)
1215 pdev->has_secondary_link = 1;
1216 else if (type == PCI_EXP_TYPE_UPSTREAM ||
1217 type == PCI_EXP_TYPE_DOWNSTREAM) {
1218 parent = pci_upstream_bridge(pdev);
1221 * Usually there's an upstream device (Root Port or Switch
1222 * Downstream Port), but we can't assume one exists.
1224 if (parent && !parent->has_secondary_link)
1225 pdev->has_secondary_link = 1;
1229 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
1233 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
1234 if (reg32 & PCI_EXP_SLTCAP_HPC)
1235 pdev->is_hotplug_bridge = 1;
1238 static void set_pcie_thunderbolt(struct pci_dev *dev)
1243 while ((vsec = pci_find_next_ext_capability(dev, vsec,
1244 PCI_EXT_CAP_ID_VNDR))) {
1245 pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, &header);
1247 /* Is the device part of a Thunderbolt controller? */
1248 if (dev->vendor == PCI_VENDOR_ID_INTEL &&
1249 PCI_VNDR_HEADER_ID(header) == PCI_VSEC_ID_INTEL_TBT) {
1250 dev->is_thunderbolt = 1;
1257 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
1260 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
1261 * when forwarding a type1 configuration request the bridge must check that
1262 * the extended register address field is zero. The bridge is not permitted
1263 * to forward the transactions and must handle it as an Unsupported Request.
1264 * Some bridges do not follow this rule and simply drop the extended register
1265 * bits, resulting in the standard config space being aliased, every 256
1266 * bytes across the entire configuration space. Test for this condition by
1267 * comparing the first dword of each potential alias to the vendor/device ID.
1269 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
1270 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
1272 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
1274 #ifdef CONFIG_PCI_QUIRKS
1278 pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
1280 for (pos = PCI_CFG_SPACE_SIZE;
1281 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
1282 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
1294 * pci_cfg_space_size - get the configuration space size of the PCI device.
1297 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1298 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1299 * access it. Maybe we don't have a way to generate extended config space
1300 * accesses, or the device is behind a reverse Express bridge. So we try
1301 * reading the dword at 0x100 which must either be 0 or a valid extended
1302 * capability header.
1304 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1307 int pos = PCI_CFG_SPACE_SIZE;
1309 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1310 return PCI_CFG_SPACE_SIZE;
1311 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
1312 return PCI_CFG_SPACE_SIZE;
1314 return PCI_CFG_SPACE_EXP_SIZE;
1317 int pci_cfg_space_size(struct pci_dev *dev)
1323 class = dev->class >> 8;
1324 if (class == PCI_CLASS_BRIDGE_HOST)
1325 return pci_cfg_space_size_ext(dev);
1327 if (pci_is_pcie(dev))
1328 return pci_cfg_space_size_ext(dev);
1330 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1332 return PCI_CFG_SPACE_SIZE;
1334 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1335 if (status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))
1336 return pci_cfg_space_size_ext(dev);
1338 return PCI_CFG_SPACE_SIZE;
1341 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1343 static void pci_msi_setup_pci_dev(struct pci_dev *dev)
1346 * Disable the MSI hardware to avoid screaming interrupts
1347 * during boot. This is the power on reset default so
1348 * usually this should be a noop.
1350 dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
1352 pci_msi_set_enable(dev, 0);
1354 dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1356 pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
1360 * pci_setup_device - fill in class and map information of a device
1361 * @dev: the device structure to fill
1363 * Initialize the device structure with information about the device's
1364 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1365 * Called at initialisation of the PCI subsystem and by CardBus services.
1366 * Returns 0 on success and negative if unknown type of device (not normal,
1367 * bridge or CardBus).
1369 int pci_setup_device(struct pci_dev *dev)
1375 struct pci_bus_region region;
1376 struct resource *res;
1378 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1381 dev->sysdata = dev->bus->sysdata;
1382 dev->dev.parent = dev->bus->bridge;
1383 dev->dev.bus = &pci_bus_type;
1384 dev->hdr_type = hdr_type & 0x7f;
1385 dev->multifunction = !!(hdr_type & 0x80);
1386 dev->error_state = pci_channel_io_normal;
1387 set_pcie_port_type(dev);
1389 pci_dev_assign_slot(dev);
1390 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1391 set this higher, assuming the system even supports it. */
1392 dev->dma_mask = 0xffffffff;
1394 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1395 dev->bus->number, PCI_SLOT(dev->devfn),
1396 PCI_FUNC(dev->devfn));
1398 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1399 dev->revision = class & 0xff;
1400 dev->class = class >> 8; /* upper 3 bytes */
1402 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1403 dev->vendor, dev->device, dev->hdr_type, dev->class);
1405 /* need to have dev->class ready */
1406 dev->cfg_size = pci_cfg_space_size(dev);
1408 /* need to have dev->cfg_size ready */
1409 set_pcie_thunderbolt(dev);
1411 /* "Unknown power state" */
1412 dev->current_state = PCI_UNKNOWN;
1414 /* Early fixups, before probing the BARs */
1415 pci_fixup_device(pci_fixup_early, dev);
1416 /* device class may be changed after fixup */
1417 class = dev->class >> 8;
1419 if (dev->non_compliant_bars) {
1420 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1421 if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
1422 dev_info(&dev->dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
1423 cmd &= ~PCI_COMMAND_IO;
1424 cmd &= ~PCI_COMMAND_MEMORY;
1425 pci_write_config_word(dev, PCI_COMMAND, cmd);
1429 switch (dev->hdr_type) { /* header type */
1430 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1431 if (class == PCI_CLASS_BRIDGE_PCI)
1434 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1435 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1436 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1439 * Do the ugly legacy mode stuff here rather than broken chip
1440 * quirk code. Legacy mode ATA controllers have fixed
1441 * addresses. These are not always echoed in BAR0-3, and
1442 * BAR0-3 in a few cases contain junk!
1444 if (class == PCI_CLASS_STORAGE_IDE) {
1446 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1447 if ((progif & 1) == 0) {
1448 region.start = 0x1F0;
1450 res = &dev->resource[0];
1451 res->flags = LEGACY_IO_RESOURCE;
1452 pcibios_bus_to_resource(dev->bus, res, ®ion);
1453 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1455 region.start = 0x3F6;
1457 res = &dev->resource[1];
1458 res->flags = LEGACY_IO_RESOURCE;
1459 pcibios_bus_to_resource(dev->bus, res, ®ion);
1460 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1463 if ((progif & 4) == 0) {
1464 region.start = 0x170;
1466 res = &dev->resource[2];
1467 res->flags = LEGACY_IO_RESOURCE;
1468 pcibios_bus_to_resource(dev->bus, res, ®ion);
1469 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1471 region.start = 0x376;
1473 res = &dev->resource[3];
1474 res->flags = LEGACY_IO_RESOURCE;
1475 pcibios_bus_to_resource(dev->bus, res, ®ion);
1476 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1482 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1483 if (class != PCI_CLASS_BRIDGE_PCI)
1485 /* The PCI-to-PCI bridge spec requires that subtractive
1486 decoding (i.e. transparent) bridge must have programming
1487 interface code of 0x01. */
1489 dev->transparent = ((dev->class & 0xff) == 1);
1490 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1491 set_pcie_hotplug_bridge(dev);
1492 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1494 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1495 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1499 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1500 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1503 pci_read_bases(dev, 1, 0);
1504 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1505 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1508 default: /* unknown header */
1509 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
1514 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
1515 dev->class, dev->hdr_type);
1516 dev->class = PCI_CLASS_NOT_DEFINED << 8;
1519 /* We found a fine healthy device, go go go... */
1523 static void pci_configure_mps(struct pci_dev *dev)
1525 struct pci_dev *bridge = pci_upstream_bridge(dev);
1528 if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
1531 mps = pcie_get_mps(dev);
1532 p_mps = pcie_get_mps(bridge);
1537 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1538 dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1539 mps, pci_name(bridge), p_mps);
1544 * Fancier MPS configuration is done later by
1545 * pcie_bus_configure_settings()
1547 if (pcie_bus_config != PCIE_BUS_DEFAULT)
1550 rc = pcie_set_mps(dev, p_mps);
1552 dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1557 dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n",
1558 p_mps, mps, 128 << dev->pcie_mpss);
1561 static struct hpp_type0 pci_default_type0 = {
1563 .cache_line_size = 8,
1564 .latency_timer = 0x40,
1569 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
1571 u16 pci_cmd, pci_bctl;
1574 hpp = &pci_default_type0;
1576 if (hpp->revision > 1) {
1578 "PCI settings rev %d not supported; using defaults\n",
1580 hpp = &pci_default_type0;
1583 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
1584 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
1585 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1586 if (hpp->enable_serr)
1587 pci_cmd |= PCI_COMMAND_SERR;
1588 if (hpp->enable_perr)
1589 pci_cmd |= PCI_COMMAND_PARITY;
1590 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1592 /* Program bridge control value */
1593 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1594 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1595 hpp->latency_timer);
1596 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1597 if (hpp->enable_serr)
1598 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1599 if (hpp->enable_perr)
1600 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1601 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1605 static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
1612 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1616 dev_warn(&dev->dev, "PCI-X settings not supported\n");
1619 static bool pcie_root_rcb_set(struct pci_dev *dev)
1621 struct pci_dev *rp = pcie_find_root_port(dev);
1627 pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
1628 if (lnkctl & PCI_EXP_LNKCTL_RCB)
1634 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
1642 if (!pci_is_pcie(dev))
1645 if (hpp->revision > 1) {
1646 dev_warn(&dev->dev, "PCIe settings rev %d not supported\n",
1652 * Don't allow _HPX to change MPS or MRRS settings. We manage
1653 * those to make sure they're consistent with the rest of the
1656 hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
1657 PCI_EXP_DEVCTL_READRQ;
1658 hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
1659 PCI_EXP_DEVCTL_READRQ);
1661 /* Initialize Device Control Register */
1662 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
1663 ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
1665 /* Initialize Link Control Register */
1666 if (pcie_cap_has_lnkctl(dev)) {
1669 * If the Root Port supports Read Completion Boundary of
1670 * 128, set RCB to 128. Otherwise, clear it.
1672 hpp->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
1673 hpp->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
1674 if (pcie_root_rcb_set(dev))
1675 hpp->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
1677 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
1678 ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
1681 /* Find Advanced Error Reporting Enhanced Capability */
1682 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
1686 /* Initialize Uncorrectable Error Mask Register */
1687 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
1688 reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
1689 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
1691 /* Initialize Uncorrectable Error Severity Register */
1692 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
1693 reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
1694 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
1696 /* Initialize Correctable Error Mask Register */
1697 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
1698 reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
1699 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
1701 /* Initialize Advanced Error Capabilities and Control Register */
1702 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
1703 reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
1704 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
1707 * FIXME: The following two registers are not supported yet.
1709 * o Secondary Uncorrectable Error Severity Register
1710 * o Secondary Uncorrectable Error Mask Register
1714 static void pci_configure_extended_tags(struct pci_dev *dev)
1719 if (!pci_is_pcie(dev))
1722 ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &dev_cap);
1726 if (dev_cap & PCI_EXP_DEVCAP_EXT_TAG)
1727 pcie_capability_set_word(dev, PCI_EXP_DEVCTL,
1728 PCI_EXP_DEVCTL_EXT_TAG);
1731 static void pci_configure_device(struct pci_dev *dev)
1733 struct hotplug_params hpp;
1736 pci_configure_mps(dev);
1737 pci_configure_extended_tags(dev);
1739 memset(&hpp, 0, sizeof(hpp));
1740 ret = pci_get_hp_params(dev, &hpp);
1744 program_hpp_type2(dev, hpp.t2);
1745 program_hpp_type1(dev, hpp.t1);
1746 program_hpp_type0(dev, hpp.t0);
1749 static void pci_release_capabilities(struct pci_dev *dev)
1751 pci_vpd_release(dev);
1752 pci_iov_release(dev);
1753 pci_free_cap_save_buffers(dev);
1757 * pci_release_dev - free a pci device structure when all users of it are finished.
1758 * @dev: device that's been disconnected
1760 * Will be called only by the device core when all users of this pci device are
1763 static void pci_release_dev(struct device *dev)
1765 struct pci_dev *pci_dev;
1767 pci_dev = to_pci_dev(dev);
1768 pci_release_capabilities(pci_dev);
1769 pci_release_of_node(pci_dev);
1770 pcibios_release_device(pci_dev);
1771 pci_bus_put(pci_dev->bus);
1772 kfree(pci_dev->driver_override);
1773 kfree(pci_dev->dma_alias_mask);
1777 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1779 struct pci_dev *dev;
1781 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1785 INIT_LIST_HEAD(&dev->bus_list);
1786 dev->dev.type = &pci_dev_type;
1787 dev->bus = pci_bus_get(bus);
1791 EXPORT_SYMBOL(pci_alloc_dev);
1793 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1798 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1801 /* some broken boards return 0 or ~0 if a slot is empty: */
1802 if (*l == 0xffffffff || *l == 0x00000000 ||
1803 *l == 0x0000ffff || *l == 0xffff0000)
1807 * Configuration Request Retry Status. Some root ports return the
1808 * actual device ID instead of the synthetic ID (0xFFFF) required
1809 * by the PCIe spec. Ignore the device ID and only check for
1812 while ((*l & 0xffff) == 0x0001) {
1818 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1820 /* Card hasn't responded in 60 seconds? Must be stuck. */
1821 if (delay > crs_timeout) {
1822 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
1823 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
1831 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1834 * Read the config data for a PCI device, sanity-check it
1835 * and fill in the dev structure...
1837 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1839 struct pci_dev *dev;
1842 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1845 dev = pci_alloc_dev(bus);
1850 dev->vendor = l & 0xffff;
1851 dev->device = (l >> 16) & 0xffff;
1853 pci_set_of_node(dev);
1855 if (pci_setup_device(dev)) {
1856 pci_bus_put(dev->bus);
1864 static void pci_init_capabilities(struct pci_dev *dev)
1866 /* Enhanced Allocation */
1869 /* Setup MSI caps & disable MSI/MSI-X interrupts */
1870 pci_msi_setup_pci_dev(dev);
1872 /* Buffers for saving PCIe and PCI-X capabilities */
1873 pci_allocate_cap_save_buffers(dev);
1875 /* Power Management */
1878 /* Vital Product Data */
1881 /* Alternative Routing-ID Forwarding */
1882 pci_configure_ari(dev);
1884 /* Single Root I/O Virtualization */
1887 /* Address Translation Services */
1890 /* Enable ACS P2P upstream forwarding */
1891 pci_enable_acs(dev);
1893 /* Precision Time Measurement */
1896 /* Advanced Error Reporting */
1901 * This is the equivalent of pci_host_bridge_msi_domain that acts on
1902 * devices. Firmware interfaces that can select the MSI domain on a
1903 * per-device basis should be called from here.
1905 static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev)
1907 struct irq_domain *d;
1910 * If a domain has been set through the pcibios_add_device
1911 * callback, then this is the one (platform code knows best).
1913 d = dev_get_msi_domain(&dev->dev);
1918 * Let's see if we have a firmware interface able to provide
1921 d = pci_msi_get_device_domain(dev);
1928 static void pci_set_msi_domain(struct pci_dev *dev)
1930 struct irq_domain *d;
1933 * If the platform or firmware interfaces cannot supply a
1934 * device-specific MSI domain, then inherit the default domain
1935 * from the host bridge itself.
1937 d = pci_dev_msi_domain(dev);
1939 d = dev_get_msi_domain(&dev->bus->dev);
1941 dev_set_msi_domain(&dev->dev, d);
1944 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1948 pci_configure_device(dev);
1950 device_initialize(&dev->dev);
1951 dev->dev.release = pci_release_dev;
1953 set_dev_node(&dev->dev, pcibus_to_node(bus));
1954 dev->dev.dma_mask = &dev->dma_mask;
1955 dev->dev.dma_parms = &dev->dma_parms;
1956 dev->dev.coherent_dma_mask = 0xffffffffull;
1958 pci_set_dma_max_seg_size(dev, 65536);
1959 pci_set_dma_seg_boundary(dev, 0xffffffff);
1961 /* Fix up broken headers */
1962 pci_fixup_device(pci_fixup_header, dev);
1964 /* moved out from quirk header fixup code */
1965 pci_reassigndev_resource_alignment(dev);
1967 /* Clear the state_saved flag. */
1968 dev->state_saved = false;
1970 /* Initialize various capabilities */
1971 pci_init_capabilities(dev);
1974 * Add the device to our list of discovered devices
1975 * and the bus list for fixup functions, etc.
1977 down_write(&pci_bus_sem);
1978 list_add_tail(&dev->bus_list, &bus->devices);
1979 up_write(&pci_bus_sem);
1981 ret = pcibios_add_device(dev);
1984 /* Setup MSI irq domain */
1985 pci_set_msi_domain(dev);
1987 /* Notifier could use PCI capabilities */
1988 dev->match_driver = false;
1989 ret = device_add(&dev->dev);
1993 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
1995 struct pci_dev *dev;
1997 dev = pci_get_slot(bus, devfn);
2003 dev = pci_scan_device(bus, devfn);
2007 pci_device_add(dev, bus);
2011 EXPORT_SYMBOL(pci_scan_single_device);
2013 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
2019 if (pci_ari_enabled(bus)) {
2022 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
2026 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
2027 next_fn = PCI_ARI_CAP_NFN(cap);
2029 return 0; /* protect against malformed list */
2034 /* dev may be NULL for non-contiguous multifunction devices */
2035 if (!dev || dev->multifunction)
2036 return (fn + 1) % 8;
2041 static int only_one_child(struct pci_bus *bus)
2043 struct pci_dev *parent = bus->self;
2045 if (!parent || !pci_is_pcie(parent))
2047 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
2051 * PCIe downstream ports are bridges that normally lead to only a
2052 * device 0, but if PCI_SCAN_ALL_PCIE_DEVS is set, scan all
2053 * possible devices, not just device 0. See PCIe spec r3.0,
2056 if (parent->has_secondary_link &&
2057 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
2063 * pci_scan_slot - scan a PCI slot on a bus for devices.
2064 * @bus: PCI bus to scan
2065 * @devfn: slot number to scan (must have zero function.)
2067 * Scan a PCI slot on the specified PCI bus for devices, adding
2068 * discovered devices to the @bus->devices list. New devices
2069 * will not have is_added set.
2071 * Returns the number of new devices found.
2073 int pci_scan_slot(struct pci_bus *bus, int devfn)
2075 unsigned fn, nr = 0;
2076 struct pci_dev *dev;
2078 if (only_one_child(bus) && (devfn > 0))
2079 return 0; /* Already scanned the entire slot */
2081 dev = pci_scan_single_device(bus, devfn);
2087 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
2088 dev = pci_scan_single_device(bus, devfn + fn);
2092 dev->multifunction = 1;
2096 /* only one slot has pcie device */
2097 if (bus->self && nr)
2098 pcie_aspm_init_link_state(bus->self);
2102 EXPORT_SYMBOL(pci_scan_slot);
2104 static int pcie_find_smpss(struct pci_dev *dev, void *data)
2108 if (!pci_is_pcie(dev))
2112 * We don't have a way to change MPS settings on devices that have
2113 * drivers attached. A hot-added device might support only the minimum
2114 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
2115 * where devices may be hot-added, we limit the fabric MPS to 128 so
2116 * hot-added devices will work correctly.
2118 * However, if we hot-add a device to a slot directly below a Root
2119 * Port, it's impossible for there to be other existing devices below
2120 * the port. We don't limit the MPS in this case because we can
2121 * reconfigure MPS on both the Root Port and the hot-added device,
2122 * and there are no other devices involved.
2124 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
2126 if (dev->is_hotplug_bridge &&
2127 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
2130 if (*smpss > dev->pcie_mpss)
2131 *smpss = dev->pcie_mpss;
2136 static void pcie_write_mps(struct pci_dev *dev, int mps)
2140 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
2141 mps = 128 << dev->pcie_mpss;
2143 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
2145 /* For "Performance", the assumption is made that
2146 * downstream communication will never be larger than
2147 * the MRRS. So, the MPS only needs to be configured
2148 * for the upstream communication. This being the case,
2149 * walk from the top down and set the MPS of the child
2150 * to that of the parent bus.
2152 * Configure the device MPS with the smaller of the
2153 * device MPSS or the bridge MPS (which is assumed to be
2154 * properly configured at this point to the largest
2155 * allowable MPS based on its parent bus).
2157 mps = min(mps, pcie_get_mps(dev->bus->self));
2160 rc = pcie_set_mps(dev, mps);
2162 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
2165 static void pcie_write_mrrs(struct pci_dev *dev)
2169 /* In the "safe" case, do not configure the MRRS. There appear to be
2170 * issues with setting MRRS to 0 on a number of devices.
2172 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
2175 /* For Max performance, the MRRS must be set to the largest supported
2176 * value. However, it cannot be configured larger than the MPS the
2177 * device or the bus can support. This should already be properly
2178 * configured by a prior call to pcie_write_mps.
2180 mrrs = pcie_get_mps(dev);
2182 /* MRRS is a R/W register. Invalid values can be written, but a
2183 * subsequent read will verify if the value is acceptable or not.
2184 * If the MRRS value provided is not acceptable (e.g., too large),
2185 * shrink the value until it is acceptable to the HW.
2187 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
2188 rc = pcie_set_readrq(dev, mrrs);
2192 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
2197 dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
2200 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
2204 if (!pci_is_pcie(dev))
2207 if (pcie_bus_config == PCIE_BUS_TUNE_OFF ||
2208 pcie_bus_config == PCIE_BUS_DEFAULT)
2211 mps = 128 << *(u8 *)data;
2212 orig_mps = pcie_get_mps(dev);
2214 pcie_write_mps(dev, mps);
2215 pcie_write_mrrs(dev);
2217 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
2218 pcie_get_mps(dev), 128 << dev->pcie_mpss,
2219 orig_mps, pcie_get_readrq(dev));
2224 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
2225 * parents then children fashion. If this changes, then this code will not
2228 void pcie_bus_configure_settings(struct pci_bus *bus)
2235 if (!pci_is_pcie(bus->self))
2238 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
2239 * to be aware of the MPS of the destination. To work around this,
2240 * simply force the MPS of the entire system to the smallest possible.
2242 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
2245 if (pcie_bus_config == PCIE_BUS_SAFE) {
2246 smpss = bus->self->pcie_mpss;
2248 pcie_find_smpss(bus->self, &smpss);
2249 pci_walk_bus(bus, pcie_find_smpss, &smpss);
2252 pcie_bus_configure_set(bus->self, &smpss);
2253 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
2255 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
2257 unsigned int pci_scan_child_bus(struct pci_bus *bus)
2259 unsigned int devfn, pass, max = bus->busn_res.start;
2260 struct pci_dev *dev;
2262 dev_dbg(&bus->dev, "scanning bus\n");
2264 /* Go find them, Rover! */
2265 for (devfn = 0; devfn < 0x100; devfn += 8)
2266 pci_scan_slot(bus, devfn);
2268 /* Reserve buses for SR-IOV capability. */
2269 max += pci_iov_bus_range(bus);
2272 * After performing arch-dependent fixup of the bus, look behind
2273 * all PCI-to-PCI bridges on this bus.
2275 if (!bus->is_added) {
2276 dev_dbg(&bus->dev, "fixups for bus\n");
2277 pcibios_fixup_bus(bus);
2281 for (pass = 0; pass < 2; pass++)
2282 list_for_each_entry(dev, &bus->devices, bus_list) {
2283 if (pci_is_bridge(dev))
2284 max = pci_scan_bridge(bus, dev, max, pass);
2288 * Make sure a hotplug bridge has at least the minimum requested
2291 if (bus->self && bus->self->is_hotplug_bridge && pci_hotplug_bus_size) {
2292 if (max - bus->busn_res.start < pci_hotplug_bus_size - 1)
2293 max = bus->busn_res.start + pci_hotplug_bus_size - 1;
2297 * We've scanned the bus and so we know all about what's on
2298 * the other side of any bridges that may be on this bus plus
2301 * Return how far we've got finding sub-buses.
2303 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
2306 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
2309 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
2310 * @bridge: Host bridge to set up.
2312 * Default empty implementation. Replace with an architecture-specific setup
2313 * routine, if necessary.
2315 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
2320 void __weak pcibios_add_bus(struct pci_bus *bus)
2324 void __weak pcibios_remove_bus(struct pci_bus *bus)
2328 static struct pci_bus *pci_create_root_bus_msi(struct device *parent,
2329 int bus, struct pci_ops *ops, void *sysdata,
2330 struct list_head *resources, struct msi_controller *msi)
2333 struct pci_host_bridge *bridge;
2335 bridge = pci_alloc_host_bridge(0);
2339 bridge->dev.parent = parent;
2341 list_splice_init(resources, &bridge->windows);
2342 bridge->sysdata = sysdata;
2343 bridge->busnr = bus;
2347 error = pci_register_host_bridge(bridge);
2358 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
2359 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2361 return pci_create_root_bus_msi(parent, bus, ops, sysdata, resources,
2364 EXPORT_SYMBOL_GPL(pci_create_root_bus);
2366 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
2368 struct resource *res = &b->busn_res;
2369 struct resource *parent_res, *conflict;
2373 res->flags = IORESOURCE_BUS;
2375 if (!pci_is_root_bus(b))
2376 parent_res = &b->parent->busn_res;
2378 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
2379 res->flags |= IORESOURCE_PCI_FIXED;
2382 conflict = request_resource_conflict(parent_res, res);
2385 dev_printk(KERN_DEBUG, &b->dev,
2386 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
2387 res, pci_is_root_bus(b) ? "domain " : "",
2388 parent_res, conflict->name, conflict);
2390 return conflict == NULL;
2393 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
2395 struct resource *res = &b->busn_res;
2396 struct resource old_res = *res;
2397 resource_size_t size;
2400 if (res->start > bus_max)
2403 size = bus_max - res->start + 1;
2404 ret = adjust_resource(res, res->start, size);
2405 dev_printk(KERN_DEBUG, &b->dev,
2406 "busn_res: %pR end %s updated to %02x\n",
2407 &old_res, ret ? "can not be" : "is", bus_max);
2409 if (!ret && !res->parent)
2410 pci_bus_insert_busn_res(b, res->start, res->end);
2415 void pci_bus_release_busn_res(struct pci_bus *b)
2417 struct resource *res = &b->busn_res;
2420 if (!res->flags || !res->parent)
2423 ret = release_resource(res);
2424 dev_printk(KERN_DEBUG, &b->dev,
2425 "busn_res: %pR %s released\n",
2426 res, ret ? "can not be" : "is");
2429 int pci_scan_root_bus_bridge(struct pci_host_bridge *bridge)
2431 struct resource_entry *window;
2439 resource_list_for_each_entry(window, &bridge->windows)
2440 if (window->res->flags & IORESOURCE_BUS) {
2445 ret = pci_register_host_bridge(bridge);
2450 bus = bridge->busnr;
2454 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2456 pci_bus_insert_busn_res(b, bus, 255);
2459 max = pci_scan_child_bus(b);
2462 pci_bus_update_busn_res_end(b, max);
2466 EXPORT_SYMBOL(pci_scan_root_bus_bridge);
2468 struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
2469 struct pci_ops *ops, void *sysdata,
2470 struct list_head *resources, struct msi_controller *msi)
2472 struct resource_entry *window;
2477 resource_list_for_each_entry(window, resources)
2478 if (window->res->flags & IORESOURCE_BUS) {
2483 b = pci_create_root_bus_msi(parent, bus, ops, sysdata, resources, msi);
2489 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2491 pci_bus_insert_busn_res(b, bus, 255);
2494 max = pci_scan_child_bus(b);
2497 pci_bus_update_busn_res_end(b, max);
2502 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
2503 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2505 return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources,
2508 EXPORT_SYMBOL(pci_scan_root_bus);
2510 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
2513 LIST_HEAD(resources);
2516 pci_add_resource(&resources, &ioport_resource);
2517 pci_add_resource(&resources, &iomem_resource);
2518 pci_add_resource(&resources, &busn_resource);
2519 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
2521 pci_scan_child_bus(b);
2523 pci_free_resource_list(&resources);
2527 EXPORT_SYMBOL(pci_scan_bus);
2530 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
2531 * @bridge: PCI bridge for the bus to scan
2533 * Scan a PCI bus and child buses for new devices, add them,
2534 * and enable them, resizing bridge mmio/io resource if necessary
2535 * and possible. The caller must ensure the child devices are already
2536 * removed for resizing to occur.
2538 * Returns the max number of subordinate bus discovered.
2540 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
2543 struct pci_bus *bus = bridge->subordinate;
2545 max = pci_scan_child_bus(bus);
2547 pci_assign_unassigned_bridge_resources(bridge);
2549 pci_bus_add_devices(bus);
2555 * pci_rescan_bus - scan a PCI bus for devices.
2556 * @bus: PCI bus to scan
2558 * Scan a PCI bus and child buses for new devices, adds them,
2561 * Returns the max number of subordinate bus discovered.
2563 unsigned int pci_rescan_bus(struct pci_bus *bus)
2567 max = pci_scan_child_bus(bus);
2568 pci_assign_unassigned_bus_resources(bus);
2569 pci_bus_add_devices(bus);
2573 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2576 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2577 * routines should always be executed under this mutex.
2579 static DEFINE_MUTEX(pci_rescan_remove_lock);
2581 void pci_lock_rescan_remove(void)
2583 mutex_lock(&pci_rescan_remove_lock);
2585 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2587 void pci_unlock_rescan_remove(void)
2589 mutex_unlock(&pci_rescan_remove_lock);
2591 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2593 static int __init pci_sort_bf_cmp(const struct device *d_a,
2594 const struct device *d_b)
2596 const struct pci_dev *a = to_pci_dev(d_a);
2597 const struct pci_dev *b = to_pci_dev(d_b);
2599 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2600 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2602 if (a->bus->number < b->bus->number) return -1;
2603 else if (a->bus->number > b->bus->number) return 1;
2605 if (a->devfn < b->devfn) return -1;
2606 else if (a->devfn > b->devfn) return 1;
2611 void __init pci_sort_breadthfirst(void)
2613 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);