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)
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 = (u32)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 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);
520 pci_free_resource_list(&bridge->windows);
525 struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
527 struct pci_host_bridge *bridge;
529 bridge = kzalloc(sizeof(*bridge) + priv, GFP_KERNEL);
533 INIT_LIST_HEAD(&bridge->windows);
537 EXPORT_SYMBOL(pci_alloc_host_bridge);
539 static const unsigned char pcix_bus_speed[] = {
540 PCI_SPEED_UNKNOWN, /* 0 */
541 PCI_SPEED_66MHz_PCIX, /* 1 */
542 PCI_SPEED_100MHz_PCIX, /* 2 */
543 PCI_SPEED_133MHz_PCIX, /* 3 */
544 PCI_SPEED_UNKNOWN, /* 4 */
545 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
546 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
547 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
548 PCI_SPEED_UNKNOWN, /* 8 */
549 PCI_SPEED_66MHz_PCIX_266, /* 9 */
550 PCI_SPEED_100MHz_PCIX_266, /* A */
551 PCI_SPEED_133MHz_PCIX_266, /* B */
552 PCI_SPEED_UNKNOWN, /* C */
553 PCI_SPEED_66MHz_PCIX_533, /* D */
554 PCI_SPEED_100MHz_PCIX_533, /* E */
555 PCI_SPEED_133MHz_PCIX_533 /* F */
558 const unsigned char pcie_link_speed[] = {
559 PCI_SPEED_UNKNOWN, /* 0 */
560 PCIE_SPEED_2_5GT, /* 1 */
561 PCIE_SPEED_5_0GT, /* 2 */
562 PCIE_SPEED_8_0GT, /* 3 */
563 PCI_SPEED_UNKNOWN, /* 4 */
564 PCI_SPEED_UNKNOWN, /* 5 */
565 PCI_SPEED_UNKNOWN, /* 6 */
566 PCI_SPEED_UNKNOWN, /* 7 */
567 PCI_SPEED_UNKNOWN, /* 8 */
568 PCI_SPEED_UNKNOWN, /* 9 */
569 PCI_SPEED_UNKNOWN, /* A */
570 PCI_SPEED_UNKNOWN, /* B */
571 PCI_SPEED_UNKNOWN, /* C */
572 PCI_SPEED_UNKNOWN, /* D */
573 PCI_SPEED_UNKNOWN, /* E */
574 PCI_SPEED_UNKNOWN /* F */
577 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
579 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
581 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
583 static unsigned char agp_speeds[] = {
591 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
597 else if (agpstat & 2)
599 else if (agpstat & 1)
611 return agp_speeds[index];
614 static void pci_set_bus_speed(struct pci_bus *bus)
616 struct pci_dev *bridge = bus->self;
619 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
621 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
625 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
626 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
628 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
629 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
632 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
635 enum pci_bus_speed max;
637 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
640 if (status & PCI_X_SSTATUS_533MHZ) {
641 max = PCI_SPEED_133MHz_PCIX_533;
642 } else if (status & PCI_X_SSTATUS_266MHZ) {
643 max = PCI_SPEED_133MHz_PCIX_266;
644 } else if (status & PCI_X_SSTATUS_133MHZ) {
645 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
646 max = PCI_SPEED_133MHz_PCIX_ECC;
648 max = PCI_SPEED_133MHz_PCIX;
650 max = PCI_SPEED_66MHz_PCIX;
653 bus->max_bus_speed = max;
654 bus->cur_bus_speed = pcix_bus_speed[
655 (status & PCI_X_SSTATUS_FREQ) >> 6];
660 if (pci_is_pcie(bridge)) {
664 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
665 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
667 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
668 pcie_update_link_speed(bus, linksta);
672 static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
674 struct irq_domain *d;
677 * Any firmware interface that can resolve the msi_domain
678 * should be called from here.
680 d = pci_host_bridge_of_msi_domain(bus);
682 d = pci_host_bridge_acpi_msi_domain(bus);
684 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
686 * If no IRQ domain was found via the OF tree, try looking it up
687 * directly through the fwnode_handle.
690 struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
693 d = irq_find_matching_fwnode(fwnode,
701 static void pci_set_bus_msi_domain(struct pci_bus *bus)
703 struct irq_domain *d;
707 * The bus can be a root bus, a subordinate bus, or a virtual bus
708 * created by an SR-IOV device. Walk up to the first bridge device
709 * found or derive the domain from the host bridge.
711 for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) {
713 d = dev_get_msi_domain(&b->self->dev);
717 d = pci_host_bridge_msi_domain(b);
719 dev_set_msi_domain(&bus->dev, d);
722 int pci_register_host_bridge(struct pci_host_bridge *bridge)
724 struct device *parent = bridge->dev.parent;
725 struct resource_entry *window, *n;
726 struct pci_bus *bus, *b;
727 resource_size_t offset;
728 LIST_HEAD(resources);
729 struct resource *res;
734 bus = pci_alloc_bus(NULL);
740 /* temporarily move resources off the list */
741 list_splice_init(&bridge->windows, &resources);
742 bus->sysdata = bridge->sysdata;
743 bus->msi = bridge->msi;
744 bus->ops = bridge->ops;
745 bus->number = bus->busn_res.start = bridge->busnr;
746 #ifdef CONFIG_PCI_DOMAINS_GENERIC
747 bus->domain_nr = pci_bus_find_domain_nr(bus, parent);
750 b = pci_find_bus(pci_domain_nr(bus), bridge->busnr);
752 /* If we already got to this bus through a different bridge, ignore it */
753 dev_dbg(&b->dev, "bus already known\n");
758 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(bus),
761 err = pcibios_root_bridge_prepare(bridge);
765 err = device_register(&bridge->dev);
767 put_device(&bridge->dev);
769 bus->bridge = get_device(&bridge->dev);
770 device_enable_async_suspend(bus->bridge);
771 pci_set_bus_of_node(bus);
772 pci_set_bus_msi_domain(bus);
775 set_dev_node(bus->bridge, pcibus_to_node(bus));
777 bus->dev.class = &pcibus_class;
778 bus->dev.parent = bus->bridge;
780 dev_set_name(&bus->dev, "%04x:%02x", pci_domain_nr(bus), bus->number);
781 name = dev_name(&bus->dev);
783 err = device_register(&bus->dev);
787 pcibios_add_bus(bus);
789 /* Create legacy_io and legacy_mem files for this bus */
790 pci_create_legacy_files(bus);
793 dev_info(parent, "PCI host bridge to bus %s\n", name);
795 pr_info("PCI host bridge to bus %s\n", name);
797 /* Add initial resources to the bus */
798 resource_list_for_each_entry_safe(window, n, &resources) {
799 list_move_tail(&window->node, &bridge->windows);
800 offset = window->offset;
803 if (res->flags & IORESOURCE_BUS)
804 pci_bus_insert_busn_res(bus, bus->number, res->end);
806 pci_bus_add_resource(bus, res, 0);
809 if (resource_type(res) == IORESOURCE_IO)
810 fmt = " (bus address [%#06llx-%#06llx])";
812 fmt = " (bus address [%#010llx-%#010llx])";
814 snprintf(addr, sizeof(addr), fmt,
815 (unsigned long long)(res->start - offset),
816 (unsigned long long)(res->end - offset));
820 dev_info(&bus->dev, "root bus resource %pR%s\n", res, addr);
823 down_write(&pci_bus_sem);
824 list_add_tail(&bus->node, &pci_root_buses);
825 up_write(&pci_bus_sem);
830 put_device(&bridge->dev);
831 device_unregister(&bridge->dev);
837 EXPORT_SYMBOL(pci_register_host_bridge);
839 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
840 struct pci_dev *bridge, int busnr)
842 struct pci_bus *child;
847 * Allocate a new bus, and inherit stuff from the parent..
849 child = pci_alloc_bus(parent);
853 child->parent = parent;
854 child->ops = parent->ops;
855 child->msi = parent->msi;
856 child->sysdata = parent->sysdata;
857 child->bus_flags = parent->bus_flags;
859 /* initialize some portions of the bus device, but don't register it
860 * now as the parent is not properly set up yet.
862 child->dev.class = &pcibus_class;
863 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
866 * Set up the primary, secondary and subordinate
869 child->number = child->busn_res.start = busnr;
870 child->primary = parent->busn_res.start;
871 child->busn_res.end = 0xff;
874 child->dev.parent = parent->bridge;
878 child->self = bridge;
879 child->bridge = get_device(&bridge->dev);
880 child->dev.parent = child->bridge;
881 pci_set_bus_of_node(child);
882 pci_set_bus_speed(child);
884 /* Set up default resource pointers and names.. */
885 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
886 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
887 child->resource[i]->name = child->name;
889 bridge->subordinate = child;
892 pci_set_bus_msi_domain(child);
893 ret = device_register(&child->dev);
896 pcibios_add_bus(child);
898 if (child->ops->add_bus) {
899 ret = child->ops->add_bus(child);
900 if (WARN_ON(ret < 0))
901 dev_err(&child->dev, "failed to add bus: %d\n", ret);
904 /* Create legacy_io and legacy_mem files for this bus */
905 pci_create_legacy_files(child);
910 struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
913 struct pci_bus *child;
915 child = pci_alloc_child_bus(parent, dev, busnr);
917 down_write(&pci_bus_sem);
918 list_add_tail(&child->node, &parent->children);
919 up_write(&pci_bus_sem);
923 EXPORT_SYMBOL(pci_add_new_bus);
925 static void pci_enable_crs(struct pci_dev *pdev)
929 /* Enable CRS Software Visibility if supported */
930 pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap);
931 if (root_cap & PCI_EXP_RTCAP_CRSVIS)
932 pcie_capability_set_word(pdev, PCI_EXP_RTCTL,
933 PCI_EXP_RTCTL_CRSSVE);
937 * If it's a bridge, configure it and scan the bus behind it.
938 * For CardBus bridges, we don't scan behind as the devices will
939 * be handled by the bridge driver itself.
941 * We need to process bridges in two passes -- first we scan those
942 * already configured by the BIOS and after we are done with all of
943 * them, we proceed to assigning numbers to the remaining buses in
944 * order to avoid overlaps between old and new bus numbers.
946 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
948 struct pci_bus *child;
949 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
952 u8 primary, secondary, subordinate;
956 * Make sure the bridge is powered on to be able to access config
957 * space of devices below it.
959 pm_runtime_get_sync(&dev->dev);
961 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
962 primary = buses & 0xFF;
963 secondary = (buses >> 8) & 0xFF;
964 subordinate = (buses >> 16) & 0xFF;
966 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
967 secondary, subordinate, pass);
969 if (!primary && (primary != bus->number) && secondary && subordinate) {
970 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
971 primary = bus->number;
974 /* Check if setup is sensible at all */
976 (primary != bus->number || secondary <= bus->number ||
977 secondary > subordinate)) {
978 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
979 secondary, subordinate);
983 /* Disable MasterAbortMode during probing to avoid reporting
984 of bus errors (in some architectures) */
985 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
986 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
987 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
991 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
992 !is_cardbus && !broken) {
995 * Bus already configured by firmware, process it in the first
996 * pass and just note the configuration.
1002 * The bus might already exist for two reasons: Either we are
1003 * rescanning the bus or the bus is reachable through more than
1004 * one bridge. The second case can happen with the i450NX
1007 child = pci_find_bus(pci_domain_nr(bus), secondary);
1009 child = pci_add_new_bus(bus, dev, secondary);
1012 child->primary = primary;
1013 pci_bus_insert_busn_res(child, secondary, subordinate);
1014 child->bridge_ctl = bctl;
1017 cmax = pci_scan_child_bus(child);
1018 if (cmax > subordinate)
1019 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
1021 /* subordinate should equal child->busn_res.end */
1022 if (subordinate > max)
1026 * We need to assign a number to this bus which we always
1027 * do in the second pass.
1030 if (pcibios_assign_all_busses() || broken || is_cardbus)
1031 /* Temporarily disable forwarding of the
1032 configuration cycles on all bridges in
1033 this bus segment to avoid possible
1034 conflicts in the second pass between two
1035 bridges programmed with overlapping
1037 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
1043 pci_write_config_word(dev, PCI_STATUS, 0xffff);
1045 /* Prevent assigning a bus number that already exists.
1046 * This can happen when a bridge is hot-plugged, so in
1047 * this case we only re-scan this bus. */
1048 child = pci_find_bus(pci_domain_nr(bus), max+1);
1050 child = pci_add_new_bus(bus, dev, max+1);
1053 pci_bus_insert_busn_res(child, max+1, 0xff);
1056 buses = (buses & 0xff000000)
1057 | ((unsigned int)(child->primary) << 0)
1058 | ((unsigned int)(child->busn_res.start) << 8)
1059 | ((unsigned int)(child->busn_res.end) << 16);
1062 * yenta.c forces a secondary latency timer of 176.
1063 * Copy that behaviour here.
1066 buses &= ~0xff000000;
1067 buses |= CARDBUS_LATENCY_TIMER << 24;
1071 * We need to blast all three values with a single write.
1073 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
1076 child->bridge_ctl = bctl;
1077 max = pci_scan_child_bus(child);
1080 * For CardBus bridges, we leave 4 bus numbers
1081 * as cards with a PCI-to-PCI bridge can be
1084 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
1085 struct pci_bus *parent = bus;
1086 if (pci_find_bus(pci_domain_nr(bus),
1089 while (parent->parent) {
1090 if ((!pcibios_assign_all_busses()) &&
1091 (parent->busn_res.end > max) &&
1092 (parent->busn_res.end <= max+i)) {
1095 parent = parent->parent;
1099 * Often, there are two cardbus bridges
1100 * -- try to leave one valid bus number
1110 * Set the subordinate bus number to its real value.
1112 pci_bus_update_busn_res_end(child, max);
1113 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
1116 sprintf(child->name,
1117 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
1118 pci_domain_nr(bus), child->number);
1120 /* Has only triggered on CardBus, fixup is in yenta_socket */
1121 while (bus->parent) {
1122 if ((child->busn_res.end > bus->busn_res.end) ||
1123 (child->number > bus->busn_res.end) ||
1124 (child->number < bus->number) ||
1125 (child->busn_res.end < bus->number)) {
1126 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
1128 (bus->number > child->busn_res.end &&
1129 bus->busn_res.end < child->number) ?
1130 "wholly" : "partially",
1131 bus->self->transparent ? " transparent" : "",
1132 dev_name(&bus->dev),
1139 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
1141 pm_runtime_put(&dev->dev);
1145 EXPORT_SYMBOL(pci_scan_bridge);
1148 * Read interrupt line and base address registers.
1149 * The architecture-dependent code can tweak these, of course.
1151 static void pci_read_irq(struct pci_dev *dev)
1155 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
1158 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
1162 void set_pcie_port_type(struct pci_dev *pdev)
1167 struct pci_dev *parent;
1169 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
1172 pdev->pcie_cap = pos;
1173 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
1174 pdev->pcie_flags_reg = reg16;
1175 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
1176 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
1179 * A Root Port is always the upstream end of a Link. No PCIe
1180 * component has two Links. Two Links are connected by a Switch
1181 * that has a Port on each Link and internal logic to connect the
1184 type = pci_pcie_type(pdev);
1185 if (type == PCI_EXP_TYPE_ROOT_PORT)
1186 pdev->has_secondary_link = 1;
1187 else if (type == PCI_EXP_TYPE_UPSTREAM ||
1188 type == PCI_EXP_TYPE_DOWNSTREAM) {
1189 parent = pci_upstream_bridge(pdev);
1192 * Usually there's an upstream device (Root Port or Switch
1193 * Downstream Port), but we can't assume one exists.
1195 if (parent && !parent->has_secondary_link)
1196 pdev->has_secondary_link = 1;
1200 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
1204 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
1205 if (reg32 & PCI_EXP_SLTCAP_HPC)
1206 pdev->is_hotplug_bridge = 1;
1210 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
1213 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
1214 * when forwarding a type1 configuration request the bridge must check that
1215 * the extended register address field is zero. The bridge is not permitted
1216 * to forward the transactions and must handle it as an Unsupported Request.
1217 * Some bridges do not follow this rule and simply drop the extended register
1218 * bits, resulting in the standard config space being aliased, every 256
1219 * bytes across the entire configuration space. Test for this condition by
1220 * comparing the first dword of each potential alias to the vendor/device ID.
1222 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
1223 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
1225 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
1227 #ifdef CONFIG_PCI_QUIRKS
1231 pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
1233 for (pos = PCI_CFG_SPACE_SIZE;
1234 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
1235 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
1247 * pci_cfg_space_size - get the configuration space size of the PCI device.
1250 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1251 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1252 * access it. Maybe we don't have a way to generate extended config space
1253 * accesses, or the device is behind a reverse Express bridge. So we try
1254 * reading the dword at 0x100 which must either be 0 or a valid extended
1255 * capability header.
1257 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1260 int pos = PCI_CFG_SPACE_SIZE;
1262 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1263 return PCI_CFG_SPACE_SIZE;
1264 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
1265 return PCI_CFG_SPACE_SIZE;
1267 return PCI_CFG_SPACE_EXP_SIZE;
1270 int pci_cfg_space_size(struct pci_dev *dev)
1276 class = dev->class >> 8;
1277 if (class == PCI_CLASS_BRIDGE_HOST)
1278 return pci_cfg_space_size_ext(dev);
1280 if (pci_is_pcie(dev))
1281 return pci_cfg_space_size_ext(dev);
1283 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1285 return PCI_CFG_SPACE_SIZE;
1287 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1288 if (status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ))
1289 return pci_cfg_space_size_ext(dev);
1291 return PCI_CFG_SPACE_SIZE;
1294 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1296 static void pci_msi_setup_pci_dev(struct pci_dev *dev)
1299 * Disable the MSI hardware to avoid screaming interrupts
1300 * during boot. This is the power on reset default so
1301 * usually this should be a noop.
1303 dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
1305 pci_msi_set_enable(dev, 0);
1307 dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
1309 pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
1313 * pci_setup_device - fill in class and map information of a device
1314 * @dev: the device structure to fill
1316 * Initialize the device structure with information about the device's
1317 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1318 * Called at initialisation of the PCI subsystem and by CardBus services.
1319 * Returns 0 on success and negative if unknown type of device (not normal,
1320 * bridge or CardBus).
1322 int pci_setup_device(struct pci_dev *dev)
1328 struct pci_bus_region region;
1329 struct resource *res;
1331 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1334 dev->sysdata = dev->bus->sysdata;
1335 dev->dev.parent = dev->bus->bridge;
1336 dev->dev.bus = &pci_bus_type;
1337 dev->hdr_type = hdr_type & 0x7f;
1338 dev->multifunction = !!(hdr_type & 0x80);
1339 dev->error_state = pci_channel_io_normal;
1340 set_pcie_port_type(dev);
1342 pci_dev_assign_slot(dev);
1343 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1344 set this higher, assuming the system even supports it. */
1345 dev->dma_mask = 0xffffffff;
1347 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1348 dev->bus->number, PCI_SLOT(dev->devfn),
1349 PCI_FUNC(dev->devfn));
1351 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1352 dev->revision = class & 0xff;
1353 dev->class = class >> 8; /* upper 3 bytes */
1355 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1356 dev->vendor, dev->device, dev->hdr_type, dev->class);
1358 /* need to have dev->class ready */
1359 dev->cfg_size = pci_cfg_space_size(dev);
1361 /* "Unknown power state" */
1362 dev->current_state = PCI_UNKNOWN;
1364 /* Early fixups, before probing the BARs */
1365 pci_fixup_device(pci_fixup_early, dev);
1366 /* device class may be changed after fixup */
1367 class = dev->class >> 8;
1369 if (dev->non_compliant_bars) {
1370 pci_read_config_word(dev, PCI_COMMAND, &cmd);
1371 if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
1372 dev_info(&dev->dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
1373 cmd &= ~PCI_COMMAND_IO;
1374 cmd &= ~PCI_COMMAND_MEMORY;
1375 pci_write_config_word(dev, PCI_COMMAND, cmd);
1379 switch (dev->hdr_type) { /* header type */
1380 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1381 if (class == PCI_CLASS_BRIDGE_PCI)
1384 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1385 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1386 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1389 * Do the ugly legacy mode stuff here rather than broken chip
1390 * quirk code. Legacy mode ATA controllers have fixed
1391 * addresses. These are not always echoed in BAR0-3, and
1392 * BAR0-3 in a few cases contain junk!
1394 if (class == PCI_CLASS_STORAGE_IDE) {
1396 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1397 if ((progif & 1) == 0) {
1398 region.start = 0x1F0;
1400 res = &dev->resource[0];
1401 res->flags = LEGACY_IO_RESOURCE;
1402 pcibios_bus_to_resource(dev->bus, res, ®ion);
1403 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1405 region.start = 0x3F6;
1407 res = &dev->resource[1];
1408 res->flags = LEGACY_IO_RESOURCE;
1409 pcibios_bus_to_resource(dev->bus, res, ®ion);
1410 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1413 if ((progif & 4) == 0) {
1414 region.start = 0x170;
1416 res = &dev->resource[2];
1417 res->flags = LEGACY_IO_RESOURCE;
1418 pcibios_bus_to_resource(dev->bus, res, ®ion);
1419 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1421 region.start = 0x376;
1423 res = &dev->resource[3];
1424 res->flags = LEGACY_IO_RESOURCE;
1425 pcibios_bus_to_resource(dev->bus, res, ®ion);
1426 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1432 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1433 if (class != PCI_CLASS_BRIDGE_PCI)
1435 /* The PCI-to-PCI bridge spec requires that subtractive
1436 decoding (i.e. transparent) bridge must have programming
1437 interface code of 0x01. */
1439 dev->transparent = ((dev->class & 0xff) == 1);
1440 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1441 set_pcie_hotplug_bridge(dev);
1442 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1444 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1445 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1449 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1450 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1453 pci_read_bases(dev, 1, 0);
1454 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1455 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1458 default: /* unknown header */
1459 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
1464 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
1465 dev->class, dev->hdr_type);
1466 dev->class = PCI_CLASS_NOT_DEFINED << 8;
1469 /* We found a fine healthy device, go go go... */
1473 static void pci_configure_mps(struct pci_dev *dev)
1475 struct pci_dev *bridge = pci_upstream_bridge(dev);
1478 if (!pci_is_pcie(dev) || !bridge || !pci_is_pcie(bridge))
1481 mps = pcie_get_mps(dev);
1482 p_mps = pcie_get_mps(bridge);
1487 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1488 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",
1489 mps, pci_name(bridge), p_mps);
1494 * Fancier MPS configuration is done later by
1495 * pcie_bus_configure_settings()
1497 if (pcie_bus_config != PCIE_BUS_DEFAULT)
1500 rc = pcie_set_mps(dev, p_mps);
1502 dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
1507 dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n",
1508 p_mps, mps, 128 << dev->pcie_mpss);
1511 static struct hpp_type0 pci_default_type0 = {
1513 .cache_line_size = 8,
1514 .latency_timer = 0x40,
1519 static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
1521 u16 pci_cmd, pci_bctl;
1524 hpp = &pci_default_type0;
1526 if (hpp->revision > 1) {
1528 "PCI settings rev %d not supported; using defaults\n",
1530 hpp = &pci_default_type0;
1533 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp->cache_line_size);
1534 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp->latency_timer);
1535 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
1536 if (hpp->enable_serr)
1537 pci_cmd |= PCI_COMMAND_SERR;
1538 if (hpp->enable_perr)
1539 pci_cmd |= PCI_COMMAND_PARITY;
1540 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
1542 /* Program bridge control value */
1543 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
1544 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
1545 hpp->latency_timer);
1546 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
1547 if (hpp->enable_serr)
1548 pci_bctl |= PCI_BRIDGE_CTL_SERR;
1549 if (hpp->enable_perr)
1550 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
1551 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
1555 static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
1562 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1566 dev_warn(&dev->dev, "PCI-X settings not supported\n");
1569 static bool pcie_root_rcb_set(struct pci_dev *dev)
1571 struct pci_dev *rp = pcie_find_root_port(dev);
1577 pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
1578 if (lnkctl & PCI_EXP_LNKCTL_RCB)
1584 static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
1592 if (!pci_is_pcie(dev))
1595 if (hpp->revision > 1) {
1596 dev_warn(&dev->dev, "PCIe settings rev %d not supported\n",
1602 * Don't allow _HPX to change MPS or MRRS settings. We manage
1603 * those to make sure they're consistent with the rest of the
1606 hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
1607 PCI_EXP_DEVCTL_READRQ;
1608 hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
1609 PCI_EXP_DEVCTL_READRQ);
1611 /* Initialize Device Control Register */
1612 pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
1613 ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or);
1615 /* Initialize Link Control Register */
1616 if (pcie_cap_has_lnkctl(dev)) {
1619 * If the Root Port supports Read Completion Boundary of
1620 * 128, set RCB to 128. Otherwise, clear it.
1622 hpp->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
1623 hpp->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
1624 if (pcie_root_rcb_set(dev))
1625 hpp->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
1627 pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
1628 ~hpp->pci_exp_lnkctl_and, hpp->pci_exp_lnkctl_or);
1631 /* Find Advanced Error Reporting Enhanced Capability */
1632 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
1636 /* Initialize Uncorrectable Error Mask Register */
1637 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
1638 reg32 = (reg32 & hpp->unc_err_mask_and) | hpp->unc_err_mask_or;
1639 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
1641 /* Initialize Uncorrectable Error Severity Register */
1642 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
1643 reg32 = (reg32 & hpp->unc_err_sever_and) | hpp->unc_err_sever_or;
1644 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
1646 /* Initialize Correctable Error Mask Register */
1647 pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
1648 reg32 = (reg32 & hpp->cor_err_mask_and) | hpp->cor_err_mask_or;
1649 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
1651 /* Initialize Advanced Error Capabilities and Control Register */
1652 pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
1653 reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
1654 pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
1657 * FIXME: The following two registers are not supported yet.
1659 * o Secondary Uncorrectable Error Severity Register
1660 * o Secondary Uncorrectable Error Mask Register
1664 static void pci_configure_extended_tags(struct pci_dev *dev)
1669 if (!pci_is_pcie(dev))
1672 ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &dev_cap);
1676 if (dev_cap & PCI_EXP_DEVCAP_EXT_TAG)
1677 pcie_capability_set_word(dev, PCI_EXP_DEVCTL,
1678 PCI_EXP_DEVCTL_EXT_TAG);
1681 static void pci_configure_device(struct pci_dev *dev)
1683 struct hotplug_params hpp;
1686 pci_configure_mps(dev);
1687 pci_configure_extended_tags(dev);
1689 memset(&hpp, 0, sizeof(hpp));
1690 ret = pci_get_hp_params(dev, &hpp);
1694 program_hpp_type2(dev, hpp.t2);
1695 program_hpp_type1(dev, hpp.t1);
1696 program_hpp_type0(dev, hpp.t0);
1699 static void pci_release_capabilities(struct pci_dev *dev)
1701 pci_vpd_release(dev);
1702 pci_iov_release(dev);
1703 pci_free_cap_save_buffers(dev);
1707 * pci_release_dev - free a pci device structure when all users of it are finished.
1708 * @dev: device that's been disconnected
1710 * Will be called only by the device core when all users of this pci device are
1713 static void pci_release_dev(struct device *dev)
1715 struct pci_dev *pci_dev;
1717 pci_dev = to_pci_dev(dev);
1718 pci_release_capabilities(pci_dev);
1719 pci_release_of_node(pci_dev);
1720 pcibios_release_device(pci_dev);
1721 pci_bus_put(pci_dev->bus);
1722 kfree(pci_dev->driver_override);
1723 kfree(pci_dev->dma_alias_mask);
1727 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1729 struct pci_dev *dev;
1731 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1735 INIT_LIST_HEAD(&dev->bus_list);
1736 dev->dev.type = &pci_dev_type;
1737 dev->bus = pci_bus_get(bus);
1741 EXPORT_SYMBOL(pci_alloc_dev);
1743 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1748 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1751 /* some broken boards return 0 or ~0 if a slot is empty: */
1752 if (*l == 0xffffffff || *l == 0x00000000 ||
1753 *l == 0x0000ffff || *l == 0xffff0000)
1757 * Configuration Request Retry Status. Some root ports return the
1758 * actual device ID instead of the synthetic ID (0xFFFF) required
1759 * by the PCIe spec. Ignore the device ID and only check for
1762 while ((*l & 0xffff) == 0x0001) {
1768 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1770 /* Card hasn't responded in 60 seconds? Must be stuck. */
1771 if (delay > crs_timeout) {
1772 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
1773 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
1781 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1784 * Read the config data for a PCI device, sanity-check it
1785 * and fill in the dev structure...
1787 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1789 struct pci_dev *dev;
1792 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1795 dev = pci_alloc_dev(bus);
1800 dev->vendor = l & 0xffff;
1801 dev->device = (l >> 16) & 0xffff;
1803 pci_set_of_node(dev);
1805 if (pci_setup_device(dev)) {
1806 pci_bus_put(dev->bus);
1814 static void pci_init_capabilities(struct pci_dev *dev)
1816 /* Enhanced Allocation */
1819 /* Setup MSI caps & disable MSI/MSI-X interrupts */
1820 pci_msi_setup_pci_dev(dev);
1822 /* Buffers for saving PCIe and PCI-X capabilities */
1823 pci_allocate_cap_save_buffers(dev);
1825 /* Power Management */
1828 /* Vital Product Data */
1831 /* Alternative Routing-ID Forwarding */
1832 pci_configure_ari(dev);
1834 /* Single Root I/O Virtualization */
1837 /* Address Translation Services */
1840 /* Enable ACS P2P upstream forwarding */
1841 pci_enable_acs(dev);
1843 /* Precision Time Measurement */
1846 /* Advanced Error Reporting */
1851 * This is the equivalent of pci_host_bridge_msi_domain that acts on
1852 * devices. Firmware interfaces that can select the MSI domain on a
1853 * per-device basis should be called from here.
1855 static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev)
1857 struct irq_domain *d;
1860 * If a domain has been set through the pcibios_add_device
1861 * callback, then this is the one (platform code knows best).
1863 d = dev_get_msi_domain(&dev->dev);
1868 * Let's see if we have a firmware interface able to provide
1871 d = pci_msi_get_device_domain(dev);
1878 static void pci_set_msi_domain(struct pci_dev *dev)
1880 struct irq_domain *d;
1883 * If the platform or firmware interfaces cannot supply a
1884 * device-specific MSI domain, then inherit the default domain
1885 * from the host bridge itself.
1887 d = pci_dev_msi_domain(dev);
1889 d = dev_get_msi_domain(&dev->bus->dev);
1891 dev_set_msi_domain(&dev->dev, d);
1895 * pci_dma_configure - Setup DMA configuration
1896 * @dev: ptr to pci_dev struct of the PCI device
1898 * Function to update PCI devices's DMA configuration using the same
1899 * info from the OF node or ACPI node of host bridge's parent (if any).
1901 static void pci_dma_configure(struct pci_dev *dev)
1903 struct device *bridge = pci_get_host_bridge_device(dev);
1905 if (IS_ENABLED(CONFIG_OF) &&
1906 bridge->parent && bridge->parent->of_node) {
1907 of_dma_configure(&dev->dev, bridge->parent->of_node);
1908 } else if (has_acpi_companion(bridge)) {
1909 struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1910 enum dev_dma_attr attr = acpi_get_dma_attr(adev);
1912 if (attr == DEV_DMA_NOT_SUPPORTED)
1913 dev_warn(&dev->dev, "DMA not supported.\n");
1915 acpi_dma_configure(&dev->dev, attr);
1918 pci_put_host_bridge_device(bridge);
1921 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1925 pci_configure_device(dev);
1927 device_initialize(&dev->dev);
1928 dev->dev.release = pci_release_dev;
1930 set_dev_node(&dev->dev, pcibus_to_node(bus));
1931 dev->dev.dma_mask = &dev->dma_mask;
1932 dev->dev.dma_parms = &dev->dma_parms;
1933 dev->dev.coherent_dma_mask = 0xffffffffull;
1934 pci_dma_configure(dev);
1936 pci_set_dma_max_seg_size(dev, 65536);
1937 pci_set_dma_seg_boundary(dev, 0xffffffff);
1939 /* Fix up broken headers */
1940 pci_fixup_device(pci_fixup_header, dev);
1942 /* moved out from quirk header fixup code */
1943 pci_reassigndev_resource_alignment(dev);
1945 /* Clear the state_saved flag. */
1946 dev->state_saved = false;
1948 /* Initialize various capabilities */
1949 pci_init_capabilities(dev);
1952 * Add the device to our list of discovered devices
1953 * and the bus list for fixup functions, etc.
1955 down_write(&pci_bus_sem);
1956 list_add_tail(&dev->bus_list, &bus->devices);
1957 up_write(&pci_bus_sem);
1959 ret = pcibios_add_device(dev);
1962 /* Setup MSI irq domain */
1963 pci_set_msi_domain(dev);
1965 /* Notifier could use PCI capabilities */
1966 dev->match_driver = false;
1967 ret = device_add(&dev->dev);
1971 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
1973 struct pci_dev *dev;
1975 dev = pci_get_slot(bus, devfn);
1981 dev = pci_scan_device(bus, devfn);
1985 pci_device_add(dev, bus);
1989 EXPORT_SYMBOL(pci_scan_single_device);
1991 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1997 if (pci_ari_enabled(bus)) {
2000 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
2004 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
2005 next_fn = PCI_ARI_CAP_NFN(cap);
2007 return 0; /* protect against malformed list */
2012 /* dev may be NULL for non-contiguous multifunction devices */
2013 if (!dev || dev->multifunction)
2014 return (fn + 1) % 8;
2019 static int only_one_child(struct pci_bus *bus)
2021 struct pci_dev *parent = bus->self;
2023 if (!parent || !pci_is_pcie(parent))
2025 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
2029 * PCIe downstream ports are bridges that normally lead to only a
2030 * device 0, but if PCI_SCAN_ALL_PCIE_DEVS is set, scan all
2031 * possible devices, not just device 0. See PCIe spec r3.0,
2034 if (parent->has_secondary_link &&
2035 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
2041 * pci_scan_slot - scan a PCI slot on a bus for devices.
2042 * @bus: PCI bus to scan
2043 * @devfn: slot number to scan (must have zero function.)
2045 * Scan a PCI slot on the specified PCI bus for devices, adding
2046 * discovered devices to the @bus->devices list. New devices
2047 * will not have is_added set.
2049 * Returns the number of new devices found.
2051 int pci_scan_slot(struct pci_bus *bus, int devfn)
2053 unsigned fn, nr = 0;
2054 struct pci_dev *dev;
2056 if (only_one_child(bus) && (devfn > 0))
2057 return 0; /* Already scanned the entire slot */
2059 dev = pci_scan_single_device(bus, devfn);
2065 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
2066 dev = pci_scan_single_device(bus, devfn + fn);
2070 dev->multifunction = 1;
2074 /* only one slot has pcie device */
2075 if (bus->self && nr)
2076 pcie_aspm_init_link_state(bus->self);
2080 EXPORT_SYMBOL(pci_scan_slot);
2082 static int pcie_find_smpss(struct pci_dev *dev, void *data)
2086 if (!pci_is_pcie(dev))
2090 * We don't have a way to change MPS settings on devices that have
2091 * drivers attached. A hot-added device might support only the minimum
2092 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
2093 * where devices may be hot-added, we limit the fabric MPS to 128 so
2094 * hot-added devices will work correctly.
2096 * However, if we hot-add a device to a slot directly below a Root
2097 * Port, it's impossible for there to be other existing devices below
2098 * the port. We don't limit the MPS in this case because we can
2099 * reconfigure MPS on both the Root Port and the hot-added device,
2100 * and there are no other devices involved.
2102 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
2104 if (dev->is_hotplug_bridge &&
2105 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
2108 if (*smpss > dev->pcie_mpss)
2109 *smpss = dev->pcie_mpss;
2114 static void pcie_write_mps(struct pci_dev *dev, int mps)
2118 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
2119 mps = 128 << dev->pcie_mpss;
2121 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
2123 /* For "Performance", the assumption is made that
2124 * downstream communication will never be larger than
2125 * the MRRS. So, the MPS only needs to be configured
2126 * for the upstream communication. This being the case,
2127 * walk from the top down and set the MPS of the child
2128 * to that of the parent bus.
2130 * Configure the device MPS with the smaller of the
2131 * device MPSS or the bridge MPS (which is assumed to be
2132 * properly configured at this point to the largest
2133 * allowable MPS based on its parent bus).
2135 mps = min(mps, pcie_get_mps(dev->bus->self));
2138 rc = pcie_set_mps(dev, mps);
2140 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
2143 static void pcie_write_mrrs(struct pci_dev *dev)
2147 /* In the "safe" case, do not configure the MRRS. There appear to be
2148 * issues with setting MRRS to 0 on a number of devices.
2150 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
2153 /* For Max performance, the MRRS must be set to the largest supported
2154 * value. However, it cannot be configured larger than the MPS the
2155 * device or the bus can support. This should already be properly
2156 * configured by a prior call to pcie_write_mps.
2158 mrrs = pcie_get_mps(dev);
2160 /* MRRS is a R/W register. Invalid values can be written, but a
2161 * subsequent read will verify if the value is acceptable or not.
2162 * If the MRRS value provided is not acceptable (e.g., too large),
2163 * shrink the value until it is acceptable to the HW.
2165 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
2166 rc = pcie_set_readrq(dev, mrrs);
2170 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
2175 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");
2178 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
2182 if (!pci_is_pcie(dev))
2185 if (pcie_bus_config == PCIE_BUS_TUNE_OFF ||
2186 pcie_bus_config == PCIE_BUS_DEFAULT)
2189 mps = 128 << *(u8 *)data;
2190 orig_mps = pcie_get_mps(dev);
2192 pcie_write_mps(dev, mps);
2193 pcie_write_mrrs(dev);
2195 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
2196 pcie_get_mps(dev), 128 << dev->pcie_mpss,
2197 orig_mps, pcie_get_readrq(dev));
2202 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
2203 * parents then children fashion. If this changes, then this code will not
2206 void pcie_bus_configure_settings(struct pci_bus *bus)
2213 if (!pci_is_pcie(bus->self))
2216 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
2217 * to be aware of the MPS of the destination. To work around this,
2218 * simply force the MPS of the entire system to the smallest possible.
2220 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
2223 if (pcie_bus_config == PCIE_BUS_SAFE) {
2224 smpss = bus->self->pcie_mpss;
2226 pcie_find_smpss(bus->self, &smpss);
2227 pci_walk_bus(bus, pcie_find_smpss, &smpss);
2230 pcie_bus_configure_set(bus->self, &smpss);
2231 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
2233 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
2235 unsigned int pci_scan_child_bus(struct pci_bus *bus)
2237 unsigned int devfn, pass, max = bus->busn_res.start;
2238 struct pci_dev *dev;
2240 dev_dbg(&bus->dev, "scanning bus\n");
2242 /* Go find them, Rover! */
2243 for (devfn = 0; devfn < 0x100; devfn += 8)
2244 pci_scan_slot(bus, devfn);
2246 /* Reserve buses for SR-IOV capability. */
2247 max += pci_iov_bus_range(bus);
2250 * After performing arch-dependent fixup of the bus, look behind
2251 * all PCI-to-PCI bridges on this bus.
2253 if (!bus->is_added) {
2254 dev_dbg(&bus->dev, "fixups for bus\n");
2255 pcibios_fixup_bus(bus);
2259 for (pass = 0; pass < 2; pass++)
2260 list_for_each_entry(dev, &bus->devices, bus_list) {
2261 if (pci_is_bridge(dev))
2262 max = pci_scan_bridge(bus, dev, max, pass);
2266 * Make sure a hotplug bridge has at least the minimum requested
2269 if (bus->self && bus->self->is_hotplug_bridge && pci_hotplug_bus_size) {
2270 if (max - bus->busn_res.start < pci_hotplug_bus_size - 1)
2271 max = bus->busn_res.start + pci_hotplug_bus_size - 1;
2275 * We've scanned the bus and so we know all about what's on
2276 * the other side of any bridges that may be on this bus plus
2279 * Return how far we've got finding sub-buses.
2281 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
2284 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
2287 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
2288 * @bridge: Host bridge to set up.
2290 * Default empty implementation. Replace with an architecture-specific setup
2291 * routine, if necessary.
2293 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
2298 void __weak pcibios_add_bus(struct pci_bus *bus)
2302 void __weak pcibios_remove_bus(struct pci_bus *bus)
2306 static struct pci_bus *pci_create_root_bus_msi(struct device *parent,
2307 int bus, struct pci_ops *ops, void *sysdata,
2308 struct list_head *resources, struct msi_controller *msi)
2311 struct pci_host_bridge *bridge;
2313 bridge = pci_alloc_host_bridge(0);
2317 bridge->dev.parent = parent;
2318 bridge->dev.release = pci_release_host_bridge_dev;
2320 list_splice_init(resources, &bridge->windows);
2321 bridge->sysdata = sysdata;
2322 bridge->busnr = bus;
2326 error = pci_register_host_bridge(bridge);
2337 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
2338 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2340 return pci_create_root_bus_msi(parent, bus, ops, sysdata, resources,
2343 EXPORT_SYMBOL_GPL(pci_create_root_bus);
2345 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
2347 struct resource *res = &b->busn_res;
2348 struct resource *parent_res, *conflict;
2352 res->flags = IORESOURCE_BUS;
2354 if (!pci_is_root_bus(b))
2355 parent_res = &b->parent->busn_res;
2357 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
2358 res->flags |= IORESOURCE_PCI_FIXED;
2361 conflict = request_resource_conflict(parent_res, res);
2364 dev_printk(KERN_DEBUG, &b->dev,
2365 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
2366 res, pci_is_root_bus(b) ? "domain " : "",
2367 parent_res, conflict->name, conflict);
2369 return conflict == NULL;
2372 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
2374 struct resource *res = &b->busn_res;
2375 struct resource old_res = *res;
2376 resource_size_t size;
2379 if (res->start > bus_max)
2382 size = bus_max - res->start + 1;
2383 ret = adjust_resource(res, res->start, size);
2384 dev_printk(KERN_DEBUG, &b->dev,
2385 "busn_res: %pR end %s updated to %02x\n",
2386 &old_res, ret ? "can not be" : "is", bus_max);
2388 if (!ret && !res->parent)
2389 pci_bus_insert_busn_res(b, res->start, res->end);
2394 void pci_bus_release_busn_res(struct pci_bus *b)
2396 struct resource *res = &b->busn_res;
2399 if (!res->flags || !res->parent)
2402 ret = release_resource(res);
2403 dev_printk(KERN_DEBUG, &b->dev,
2404 "busn_res: %pR %s released\n",
2405 res, ret ? "can not be" : "is");
2408 struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
2409 struct pci_ops *ops, void *sysdata,
2410 struct list_head *resources, struct msi_controller *msi)
2412 struct resource_entry *window;
2417 resource_list_for_each_entry(window, resources)
2418 if (window->res->flags & IORESOURCE_BUS) {
2423 b = pci_create_root_bus_msi(parent, bus, ops, sysdata, resources, msi);
2429 "No busn resource found for root bus, will use [bus %02x-ff]\n",
2431 pci_bus_insert_busn_res(b, bus, 255);
2434 max = pci_scan_child_bus(b);
2437 pci_bus_update_busn_res_end(b, max);
2442 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
2443 struct pci_ops *ops, void *sysdata, struct list_head *resources)
2445 return pci_scan_root_bus_msi(parent, bus, ops, sysdata, resources,
2448 EXPORT_SYMBOL(pci_scan_root_bus);
2450 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
2453 LIST_HEAD(resources);
2456 pci_add_resource(&resources, &ioport_resource);
2457 pci_add_resource(&resources, &iomem_resource);
2458 pci_add_resource(&resources, &busn_resource);
2459 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
2461 pci_scan_child_bus(b);
2463 pci_free_resource_list(&resources);
2467 EXPORT_SYMBOL(pci_scan_bus);
2470 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
2471 * @bridge: PCI bridge for the bus to scan
2473 * Scan a PCI bus and child buses for new devices, add them,
2474 * and enable them, resizing bridge mmio/io resource if necessary
2475 * and possible. The caller must ensure the child devices are already
2476 * removed for resizing to occur.
2478 * Returns the max number of subordinate bus discovered.
2480 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
2483 struct pci_bus *bus = bridge->subordinate;
2485 max = pci_scan_child_bus(bus);
2487 pci_assign_unassigned_bridge_resources(bridge);
2489 pci_bus_add_devices(bus);
2495 * pci_rescan_bus - scan a PCI bus for devices.
2496 * @bus: PCI bus to scan
2498 * Scan a PCI bus and child buses for new devices, adds them,
2501 * Returns the max number of subordinate bus discovered.
2503 unsigned int pci_rescan_bus(struct pci_bus *bus)
2507 max = pci_scan_child_bus(bus);
2508 pci_assign_unassigned_bus_resources(bus);
2509 pci_bus_add_devices(bus);
2513 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2516 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2517 * routines should always be executed under this mutex.
2519 static DEFINE_MUTEX(pci_rescan_remove_lock);
2521 void pci_lock_rescan_remove(void)
2523 mutex_lock(&pci_rescan_remove_lock);
2525 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2527 void pci_unlock_rescan_remove(void)
2529 mutex_unlock(&pci_rescan_remove_lock);
2531 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2533 static int __init pci_sort_bf_cmp(const struct device *d_a,
2534 const struct device *d_b)
2536 const struct pci_dev *a = to_pci_dev(d_a);
2537 const struct pci_dev *b = to_pci_dev(d_b);
2539 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2540 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2542 if (a->bus->number < b->bus->number) return -1;
2543 else if (a->bus->number > b->bus->number) return 1;
2545 if (a->devfn < b->devfn) return -1;
2546 else if (a->devfn > b->devfn) return 1;
2551 void __init pci_sort_breadthfirst(void)
2553 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);