2 * probe.c - PCI detection and setup code
5 #include <linux/kernel.h>
6 #include <linux/delay.h>
7 #include <linux/init.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/cpumask.h>
12 #include <linux/pci-aspm.h>
13 #include <asm-generic/pci-bridge.h>
16 #define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
17 #define CARDBUS_RESERVE_BUSNR 3
19 static struct resource busn_resource = {
23 .flags = IORESOURCE_BUS,
26 /* Ugh. Need to stop exporting this to modules. */
27 LIST_HEAD(pci_root_buses);
28 EXPORT_SYMBOL(pci_root_buses);
30 static LIST_HEAD(pci_domain_busn_res_list);
32 struct pci_domain_busn_res {
33 struct list_head list;
38 static struct resource *get_pci_domain_busn_res(int domain_nr)
40 struct pci_domain_busn_res *r;
42 list_for_each_entry(r, &pci_domain_busn_res_list, list)
43 if (r->domain_nr == domain_nr)
46 r = kzalloc(sizeof(*r), GFP_KERNEL);
50 r->domain_nr = domain_nr;
53 r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
55 list_add_tail(&r->list, &pci_domain_busn_res_list);
60 static int find_anything(struct device *dev, void *data)
66 * Some device drivers need know if pci is initiated.
67 * Basically, we think pci is not initiated when there
68 * is no device to be found on the pci_bus_type.
70 int no_pci_devices(void)
75 dev = bus_find_device(&pci_bus_type, NULL, NULL, find_anything);
76 no_devices = (dev == NULL);
80 EXPORT_SYMBOL(no_pci_devices);
85 static void release_pcibus_dev(struct device *dev)
87 struct pci_bus *pci_bus = to_pci_bus(dev);
90 put_device(pci_bus->bridge);
91 pci_bus_remove_resources(pci_bus);
92 pci_release_bus_of_node(pci_bus);
96 static struct class pcibus_class = {
98 .dev_release = &release_pcibus_dev,
99 .dev_groups = pcibus_groups,
102 static int __init pcibus_class_init(void)
104 return class_register(&pcibus_class);
106 postcore_initcall(pcibus_class_init);
108 static u64 pci_size(u64 base, u64 maxbase, u64 mask)
110 u64 size = mask & maxbase; /* Find the significant bits */
114 /* Get the lowest of them to find the decode size, and
115 from that the extent. */
116 size = (size & ~(size-1)) - 1;
118 /* base == maxbase can be valid only if the BAR has
119 already been programmed with all 1s. */
120 if (base == maxbase && ((base | size) & mask) != mask)
126 static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
131 if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
132 flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
133 flags |= IORESOURCE_IO;
137 flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
138 flags |= IORESOURCE_MEM;
139 if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
140 flags |= IORESOURCE_PREFETCH;
142 mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
144 case PCI_BASE_ADDRESS_MEM_TYPE_32:
146 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
147 /* 1M mem BAR treated as 32-bit BAR */
149 case PCI_BASE_ADDRESS_MEM_TYPE_64:
150 flags |= IORESOURCE_MEM_64;
153 /* mem unknown type treated as 32-bit BAR */
159 #define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
162 * pci_read_base - read a PCI BAR
163 * @dev: the PCI device
164 * @type: type of the BAR
165 * @res: resource buffer to be filled in
166 * @pos: BAR position in the config space
168 * Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
170 int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
171 struct resource *res, unsigned int pos)
174 u64 l64, sz64, mask64;
176 struct pci_bus_region region, inverted_region;
177 bool bar_too_big = false, bar_disabled = false;
179 mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
181 /* No printks while decoding is disabled! */
182 if (!dev->mmio_always_on) {
183 pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
184 if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) {
185 pci_write_config_word(dev, PCI_COMMAND,
186 orig_cmd & ~PCI_COMMAND_DECODE_ENABLE);
190 res->name = pci_name(dev);
192 pci_read_config_dword(dev, pos, &l);
193 pci_write_config_dword(dev, pos, l | mask);
194 pci_read_config_dword(dev, pos, &sz);
195 pci_write_config_dword(dev, pos, l);
198 * All bits set in sz means the device isn't working properly.
199 * If the BAR isn't implemented, all bits must be 0. If it's a
200 * memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
203 if (!sz || sz == 0xffffffff)
207 * I don't know how l can have all bits set. Copied from old code.
208 * Maybe it fixes a bug on some ancient platform.
213 if (type == pci_bar_unknown) {
214 res->flags = decode_bar(dev, l);
215 res->flags |= IORESOURCE_SIZEALIGN;
216 if (res->flags & IORESOURCE_IO) {
217 l &= PCI_BASE_ADDRESS_IO_MASK;
218 mask = PCI_BASE_ADDRESS_IO_MASK & (u32) IO_SPACE_LIMIT;
220 l &= PCI_BASE_ADDRESS_MEM_MASK;
221 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
224 res->flags |= (l & IORESOURCE_ROM_ENABLE);
225 l &= PCI_ROM_ADDRESS_MASK;
226 mask = (u32)PCI_ROM_ADDRESS_MASK;
229 if (res->flags & IORESOURCE_MEM_64) {
232 mask64 = mask | (u64)~0 << 32;
234 pci_read_config_dword(dev, pos + 4, &l);
235 pci_write_config_dword(dev, pos + 4, ~0);
236 pci_read_config_dword(dev, pos + 4, &sz);
237 pci_write_config_dword(dev, pos + 4, l);
239 l64 |= ((u64)l << 32);
240 sz64 |= ((u64)sz << 32);
242 sz64 = pci_size(l64, sz64, mask64);
247 if ((sizeof(dma_addr_t) < 8 || sizeof(resource_size_t) < 8) &&
248 sz64 > 0x100000000ULL) {
249 res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
256 if ((sizeof(dma_addr_t) < 8) && l) {
257 /* Address above 32-bit boundary; disable the BAR */
258 pci_write_config_dword(dev, pos, 0);
259 pci_write_config_dword(dev, pos + 4, 0);
260 res->flags |= IORESOURCE_UNSET;
266 region.end = l64 + sz64;
269 sz = pci_size(l, sz, mask);
278 pcibios_bus_to_resource(dev->bus, res, ®ion);
279 pcibios_resource_to_bus(dev->bus, &inverted_region, res);
282 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
283 * the corresponding resource address (the physical address used by
284 * the CPU. Converting that resource address back to a bus address
285 * should yield the original BAR value:
287 * resource_to_bus(bus_to_resource(A)) == A
289 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not
290 * be claimed by the device.
292 if (inverted_region.start != region.start) {
293 dev_info(&dev->dev, "reg 0x%x: initial BAR value %pa invalid; forcing reassignment\n",
295 res->flags |= IORESOURCE_UNSET;
296 res->end -= res->start;
306 if (!dev->mmio_always_on &&
307 (orig_cmd & PCI_COMMAND_DECODE_ENABLE))
308 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
311 dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
312 pos, (unsigned long long) sz64);
313 if (res->flags && !bar_disabled)
314 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
316 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
319 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
321 unsigned int pos, reg;
323 for (pos = 0; pos < howmany; pos++) {
324 struct resource *res = &dev->resource[pos];
325 reg = PCI_BASE_ADDRESS_0 + (pos << 2);
326 pos += __pci_read_base(dev, pci_bar_unknown, res, reg);
330 struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
331 dev->rom_base_reg = rom;
332 res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
333 IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
334 IORESOURCE_SIZEALIGN;
335 __pci_read_base(dev, pci_bar_mem32, res, rom);
339 static void pci_read_bridge_io(struct pci_bus *child)
341 struct pci_dev *dev = child->self;
342 u8 io_base_lo, io_limit_lo;
343 unsigned long io_mask, io_granularity, base, limit;
344 struct pci_bus_region region;
345 struct resource *res;
347 io_mask = PCI_IO_RANGE_MASK;
348 io_granularity = 0x1000;
349 if (dev->io_window_1k) {
350 /* Support 1K I/O space granularity */
351 io_mask = PCI_IO_1K_RANGE_MASK;
352 io_granularity = 0x400;
355 res = child->resource[0];
356 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
357 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
358 base = (io_base_lo & io_mask) << 8;
359 limit = (io_limit_lo & io_mask) << 8;
361 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
362 u16 io_base_hi, io_limit_hi;
364 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
365 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
366 base |= ((unsigned long) io_base_hi << 16);
367 limit |= ((unsigned long) io_limit_hi << 16);
371 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
373 region.end = limit + io_granularity - 1;
374 pcibios_bus_to_resource(dev->bus, res, ®ion);
375 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
379 static void pci_read_bridge_mmio(struct pci_bus *child)
381 struct pci_dev *dev = child->self;
382 u16 mem_base_lo, mem_limit_lo;
383 unsigned long base, limit;
384 struct pci_bus_region region;
385 struct resource *res;
387 res = child->resource[1];
388 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
389 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
390 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
391 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
393 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
395 region.end = limit + 0xfffff;
396 pcibios_bus_to_resource(dev->bus, res, ®ion);
397 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
401 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
403 struct pci_dev *dev = child->self;
404 u16 mem_base_lo, mem_limit_lo;
405 unsigned long base, limit;
406 struct pci_bus_region region;
407 struct resource *res;
409 res = child->resource[2];
410 pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
411 pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
412 base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
413 limit = ((unsigned long) mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
415 if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
416 u32 mem_base_hi, mem_limit_hi;
418 pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
419 pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
422 * Some bridges set the base > limit by default, and some
423 * (broken) BIOSes do not initialize them. If we find
424 * this, just assume they are not being used.
426 if (mem_base_hi <= mem_limit_hi) {
427 #if BITS_PER_LONG == 64
428 base |= ((unsigned long) mem_base_hi) << 32;
429 limit |= ((unsigned long) mem_limit_hi) << 32;
431 if (mem_base_hi || mem_limit_hi) {
432 dev_err(&dev->dev, "can't handle 64-bit "
433 "address space for bridge\n");
440 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
441 IORESOURCE_MEM | IORESOURCE_PREFETCH;
442 if (res->flags & PCI_PREF_RANGE_TYPE_64)
443 res->flags |= IORESOURCE_MEM_64;
445 region.end = limit + 0xfffff;
446 pcibios_bus_to_resource(dev->bus, res, ®ion);
447 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
451 void pci_read_bridge_bases(struct pci_bus *child)
453 struct pci_dev *dev = child->self;
454 struct resource *res;
457 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
460 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
462 dev->transparent ? " (subtractive decode)" : "");
464 pci_bus_remove_resources(child);
465 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
466 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
468 pci_read_bridge_io(child);
469 pci_read_bridge_mmio(child);
470 pci_read_bridge_mmio_pref(child);
472 if (dev->transparent) {
473 pci_bus_for_each_resource(child->parent, res, i) {
475 pci_bus_add_resource(child, res,
476 PCI_SUBTRACTIVE_DECODE);
477 dev_printk(KERN_DEBUG, &dev->dev,
478 " bridge window %pR (subtractive decode)\n",
485 static struct pci_bus *pci_alloc_bus(void)
489 b = kzalloc(sizeof(*b), GFP_KERNEL);
493 INIT_LIST_HEAD(&b->node);
494 INIT_LIST_HEAD(&b->children);
495 INIT_LIST_HEAD(&b->devices);
496 INIT_LIST_HEAD(&b->slots);
497 INIT_LIST_HEAD(&b->resources);
498 b->max_bus_speed = PCI_SPEED_UNKNOWN;
499 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
503 static void pci_release_host_bridge_dev(struct device *dev)
505 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
507 if (bridge->release_fn)
508 bridge->release_fn(bridge);
510 pci_free_resource_list(&bridge->windows);
515 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
517 struct pci_host_bridge *bridge;
519 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
523 INIT_LIST_HEAD(&bridge->windows);
528 static const unsigned char pcix_bus_speed[] = {
529 PCI_SPEED_UNKNOWN, /* 0 */
530 PCI_SPEED_66MHz_PCIX, /* 1 */
531 PCI_SPEED_100MHz_PCIX, /* 2 */
532 PCI_SPEED_133MHz_PCIX, /* 3 */
533 PCI_SPEED_UNKNOWN, /* 4 */
534 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
535 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
536 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
537 PCI_SPEED_UNKNOWN, /* 8 */
538 PCI_SPEED_66MHz_PCIX_266, /* 9 */
539 PCI_SPEED_100MHz_PCIX_266, /* A */
540 PCI_SPEED_133MHz_PCIX_266, /* B */
541 PCI_SPEED_UNKNOWN, /* C */
542 PCI_SPEED_66MHz_PCIX_533, /* D */
543 PCI_SPEED_100MHz_PCIX_533, /* E */
544 PCI_SPEED_133MHz_PCIX_533 /* F */
547 const unsigned char pcie_link_speed[] = {
548 PCI_SPEED_UNKNOWN, /* 0 */
549 PCIE_SPEED_2_5GT, /* 1 */
550 PCIE_SPEED_5_0GT, /* 2 */
551 PCIE_SPEED_8_0GT, /* 3 */
552 PCI_SPEED_UNKNOWN, /* 4 */
553 PCI_SPEED_UNKNOWN, /* 5 */
554 PCI_SPEED_UNKNOWN, /* 6 */
555 PCI_SPEED_UNKNOWN, /* 7 */
556 PCI_SPEED_UNKNOWN, /* 8 */
557 PCI_SPEED_UNKNOWN, /* 9 */
558 PCI_SPEED_UNKNOWN, /* A */
559 PCI_SPEED_UNKNOWN, /* B */
560 PCI_SPEED_UNKNOWN, /* C */
561 PCI_SPEED_UNKNOWN, /* D */
562 PCI_SPEED_UNKNOWN, /* E */
563 PCI_SPEED_UNKNOWN /* F */
566 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
568 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
570 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
572 static unsigned char agp_speeds[] = {
580 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
586 else if (agpstat & 2)
588 else if (agpstat & 1)
600 return agp_speeds[index];
604 static void pci_set_bus_speed(struct pci_bus *bus)
606 struct pci_dev *bridge = bus->self;
609 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
611 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
615 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
616 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
618 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
619 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
622 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
625 enum pci_bus_speed max;
627 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
630 if (status & PCI_X_SSTATUS_533MHZ) {
631 max = PCI_SPEED_133MHz_PCIX_533;
632 } else if (status & PCI_X_SSTATUS_266MHZ) {
633 max = PCI_SPEED_133MHz_PCIX_266;
634 } else if (status & PCI_X_SSTATUS_133MHZ) {
635 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2) {
636 max = PCI_SPEED_133MHz_PCIX_ECC;
638 max = PCI_SPEED_133MHz_PCIX;
641 max = PCI_SPEED_66MHz_PCIX;
644 bus->max_bus_speed = max;
645 bus->cur_bus_speed = pcix_bus_speed[
646 (status & PCI_X_SSTATUS_FREQ) >> 6];
651 if (pci_is_pcie(bridge)) {
655 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
656 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
658 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
659 pcie_update_link_speed(bus, linksta);
664 static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
665 struct pci_dev *bridge, int busnr)
667 struct pci_bus *child;
672 * Allocate a new bus, and inherit stuff from the parent..
674 child = pci_alloc_bus();
678 child->parent = parent;
679 child->ops = parent->ops;
680 child->msi = parent->msi;
681 child->sysdata = parent->sysdata;
682 child->bus_flags = parent->bus_flags;
684 /* initialize some portions of the bus device, but don't register it
685 * now as the parent is not properly set up yet.
687 child->dev.class = &pcibus_class;
688 dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
691 * Set up the primary, secondary and subordinate
694 child->number = child->busn_res.start = busnr;
695 child->primary = parent->busn_res.start;
696 child->busn_res.end = 0xff;
699 child->dev.parent = parent->bridge;
703 child->self = bridge;
704 child->bridge = get_device(&bridge->dev);
705 child->dev.parent = child->bridge;
706 pci_set_bus_of_node(child);
707 pci_set_bus_speed(child);
709 /* Set up default resource pointers and names.. */
710 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
711 child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
712 child->resource[i]->name = child->name;
714 bridge->subordinate = child;
717 ret = device_register(&child->dev);
720 pcibios_add_bus(child);
722 /* Create legacy_io and legacy_mem files for this bus */
723 pci_create_legacy_files(child);
728 struct pci_bus *__ref pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, int busnr)
730 struct pci_bus *child;
732 child = pci_alloc_child_bus(parent, dev, busnr);
734 down_write(&pci_bus_sem);
735 list_add_tail(&child->node, &parent->children);
736 up_write(&pci_bus_sem);
742 * If it's a bridge, configure it and scan the bus behind it.
743 * For CardBus bridges, we don't scan behind as the devices will
744 * be handled by the bridge driver itself.
746 * We need to process bridges in two passes -- first we scan those
747 * already configured by the BIOS and after we are done with all of
748 * them, we proceed to assigning numbers to the remaining buses in
749 * order to avoid overlaps between old and new bus numbers.
751 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
753 struct pci_bus *child;
754 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
757 u8 primary, secondary, subordinate;
760 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
761 primary = buses & 0xFF;
762 secondary = (buses >> 8) & 0xFF;
763 subordinate = (buses >> 16) & 0xFF;
765 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
766 secondary, subordinate, pass);
768 if (!primary && (primary != bus->number) && secondary && subordinate) {
769 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
770 primary = bus->number;
773 /* Check if setup is sensible at all */
775 (primary != bus->number || secondary <= bus->number ||
776 secondary > subordinate || subordinate > bus->busn_res.end)) {
777 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
778 secondary, subordinate);
782 /* Disable MasterAbortMode during probing to avoid reporting
783 of bus errors (in some architectures) */
784 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
785 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
786 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
788 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
789 !is_cardbus && !broken) {
792 * Bus already configured by firmware, process it in the first
793 * pass and just note the configuration.
799 * The bus might already exist for two reasons: Either we are
800 * rescanning the bus or the bus is reachable through more than
801 * one bridge. The second case can happen with the i450NX
804 child = pci_find_bus(pci_domain_nr(bus), secondary);
806 child = pci_add_new_bus(bus, dev, secondary);
809 child->primary = primary;
810 pci_bus_insert_busn_res(child, secondary, subordinate);
811 child->bridge_ctl = bctl;
814 cmax = pci_scan_child_bus(child);
815 if (cmax > subordinate)
816 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
818 /* subordinate should equal child->busn_res.end */
819 if (subordinate > max)
823 * We need to assign a number to this bus which we always
824 * do in the second pass.
827 if (pcibios_assign_all_busses() || broken || is_cardbus)
828 /* Temporarily disable forwarding of the
829 configuration cycles on all bridges in
830 this bus segment to avoid possible
831 conflicts in the second pass between two
832 bridges programmed with overlapping
834 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
839 if (max >= bus->busn_res.end) {
840 dev_warn(&dev->dev, "can't allocate child bus %02x from %pR\n",
841 max, &bus->busn_res);
846 pci_write_config_word(dev, PCI_STATUS, 0xffff);
848 /* The bus will already exist if we are rescanning */
849 child = pci_find_bus(pci_domain_nr(bus), max+1);
851 child = pci_add_new_bus(bus, dev, max+1);
854 pci_bus_insert_busn_res(child, max+1,
858 buses = (buses & 0xff000000)
859 | ((unsigned int)(child->primary) << 0)
860 | ((unsigned int)(child->busn_res.start) << 8)
861 | ((unsigned int)(child->busn_res.end) << 16);
864 * yenta.c forces a secondary latency timer of 176.
865 * Copy that behaviour here.
868 buses &= ~0xff000000;
869 buses |= CARDBUS_LATENCY_TIMER << 24;
873 * We need to blast all three values with a single write.
875 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
878 child->bridge_ctl = bctl;
879 max = pci_scan_child_bus(child);
882 * For CardBus bridges, we leave 4 bus numbers
883 * as cards with a PCI-to-PCI bridge can be
886 for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
887 struct pci_bus *parent = bus;
888 if (pci_find_bus(pci_domain_nr(bus),
891 while (parent->parent) {
892 if ((!pcibios_assign_all_busses()) &&
893 (parent->busn_res.end > max) &&
894 (parent->busn_res.end <= max+i)) {
897 parent = parent->parent;
901 * Often, there are two cardbus bridges
902 * -- try to leave one valid bus number
912 * Set the subordinate bus number to its real value.
914 if (max > bus->busn_res.end) {
915 dev_warn(&dev->dev, "max busn %02x is outside %pR\n",
916 max, &bus->busn_res);
917 max = bus->busn_res.end;
919 pci_bus_update_busn_res_end(child, max);
920 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
924 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
925 pci_domain_nr(bus), child->number);
927 /* Has only triggered on CardBus, fixup is in yenta_socket */
928 while (bus->parent) {
929 if ((child->busn_res.end > bus->busn_res.end) ||
930 (child->number > bus->busn_res.end) ||
931 (child->number < bus->number) ||
932 (child->busn_res.end < bus->number)) {
933 dev_info(&child->dev, "%pR %s "
934 "hidden behind%s bridge %s %pR\n",
936 (bus->number > child->busn_res.end &&
937 bus->busn_res.end < child->number) ?
938 "wholly" : "partially",
939 bus->self->transparent ? " transparent" : "",
947 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
953 * Read interrupt line and base address registers.
954 * The architecture-dependent code can tweak these, of course.
956 static void pci_read_irq(struct pci_dev *dev)
960 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
963 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
967 void set_pcie_port_type(struct pci_dev *pdev)
972 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
975 pdev->pcie_cap = pos;
976 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
977 pdev->pcie_flags_reg = reg16;
978 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
979 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
982 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
986 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
987 if (reg32 & PCI_EXP_SLTCAP_HPC)
988 pdev->is_hotplug_bridge = 1;
993 * pci_cfg_space_size - get the configuration space size of the PCI device.
996 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
997 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
998 * access it. Maybe we don't have a way to generate extended config space
999 * accesses, or the device is behind a reverse Express bridge. So we try
1000 * reading the dword at 0x100 which must either be 0 or a valid extended
1001 * capability header.
1003 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1006 int pos = PCI_CFG_SPACE_SIZE;
1008 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1010 if (status == 0xffffffff)
1013 return PCI_CFG_SPACE_EXP_SIZE;
1016 return PCI_CFG_SPACE_SIZE;
1019 int pci_cfg_space_size(struct pci_dev *dev)
1025 class = dev->class >> 8;
1026 if (class == PCI_CLASS_BRIDGE_HOST)
1027 return pci_cfg_space_size_ext(dev);
1029 if (!pci_is_pcie(dev)) {
1030 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1034 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1035 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1039 return pci_cfg_space_size_ext(dev);
1042 return PCI_CFG_SPACE_SIZE;
1045 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1048 * pci_setup_device - fill in class and map information of a device
1049 * @dev: the device structure to fill
1051 * Initialize the device structure with information about the device's
1052 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1053 * Called at initialisation of the PCI subsystem and by CardBus services.
1054 * Returns 0 on success and negative if unknown type of device (not normal,
1055 * bridge or CardBus).
1057 int pci_setup_device(struct pci_dev *dev)
1061 struct pci_slot *slot;
1063 struct pci_bus_region region;
1064 struct resource *res;
1066 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1069 dev->sysdata = dev->bus->sysdata;
1070 dev->dev.parent = dev->bus->bridge;
1071 dev->dev.bus = &pci_bus_type;
1072 dev->hdr_type = hdr_type & 0x7f;
1073 dev->multifunction = !!(hdr_type & 0x80);
1074 dev->error_state = pci_channel_io_normal;
1075 set_pcie_port_type(dev);
1077 list_for_each_entry(slot, &dev->bus->slots, list)
1078 if (PCI_SLOT(dev->devfn) == slot->number)
1081 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1082 set this higher, assuming the system even supports it. */
1083 dev->dma_mask = 0xffffffff;
1085 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1086 dev->bus->number, PCI_SLOT(dev->devfn),
1087 PCI_FUNC(dev->devfn));
1089 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1090 dev->revision = class & 0xff;
1091 dev->class = class >> 8; /* upper 3 bytes */
1093 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1094 dev->vendor, dev->device, dev->hdr_type, dev->class);
1096 /* need to have dev->class ready */
1097 dev->cfg_size = pci_cfg_space_size(dev);
1099 /* "Unknown power state" */
1100 dev->current_state = PCI_UNKNOWN;
1102 /* Early fixups, before probing the BARs */
1103 pci_fixup_device(pci_fixup_early, dev);
1104 /* device class may be changed after fixup */
1105 class = dev->class >> 8;
1107 switch (dev->hdr_type) { /* header type */
1108 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1109 if (class == PCI_CLASS_BRIDGE_PCI)
1112 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1113 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1114 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1117 * Do the ugly legacy mode stuff here rather than broken chip
1118 * quirk code. Legacy mode ATA controllers have fixed
1119 * addresses. These are not always echoed in BAR0-3, and
1120 * BAR0-3 in a few cases contain junk!
1122 if (class == PCI_CLASS_STORAGE_IDE) {
1124 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1125 if ((progif & 1) == 0) {
1126 region.start = 0x1F0;
1128 res = &dev->resource[0];
1129 res->flags = LEGACY_IO_RESOURCE;
1130 pcibios_bus_to_resource(dev->bus, res, ®ion);
1131 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1133 region.start = 0x3F6;
1135 res = &dev->resource[1];
1136 res->flags = LEGACY_IO_RESOURCE;
1137 pcibios_bus_to_resource(dev->bus, res, ®ion);
1138 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1141 if ((progif & 4) == 0) {
1142 region.start = 0x170;
1144 res = &dev->resource[2];
1145 res->flags = LEGACY_IO_RESOURCE;
1146 pcibios_bus_to_resource(dev->bus, res, ®ion);
1147 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1149 region.start = 0x376;
1151 res = &dev->resource[3];
1152 res->flags = LEGACY_IO_RESOURCE;
1153 pcibios_bus_to_resource(dev->bus, res, ®ion);
1154 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1160 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1161 if (class != PCI_CLASS_BRIDGE_PCI)
1163 /* The PCI-to-PCI bridge spec requires that subtractive
1164 decoding (i.e. transparent) bridge must have programming
1165 interface code of 0x01. */
1167 dev->transparent = ((dev->class & 0xff) == 1);
1168 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1169 set_pcie_hotplug_bridge(dev);
1170 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1172 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1173 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1177 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1178 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1181 pci_read_bases(dev, 1, 0);
1182 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1183 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1186 default: /* unknown header */
1187 dev_err(&dev->dev, "unknown header type %02x, "
1188 "ignoring device\n", dev->hdr_type);
1192 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header "
1193 "type %02x)\n", dev->class, dev->hdr_type);
1194 dev->class = PCI_CLASS_NOT_DEFINED;
1197 /* We found a fine healthy device, go go go... */
1201 static void pci_release_capabilities(struct pci_dev *dev)
1203 pci_vpd_release(dev);
1204 pci_iov_release(dev);
1205 pci_free_cap_save_buffers(dev);
1209 * pci_release_dev - free a pci device structure when all users of it are finished.
1210 * @dev: device that's been disconnected
1212 * Will be called only by the device core when all users of this pci device are
1215 static void pci_release_dev(struct device *dev)
1217 struct pci_dev *pci_dev;
1219 pci_dev = to_pci_dev(dev);
1220 pci_release_capabilities(pci_dev);
1221 pci_release_of_node(pci_dev);
1222 pcibios_release_device(pci_dev);
1223 pci_bus_put(pci_dev->bus);
1227 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1229 struct pci_dev *dev;
1231 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1235 INIT_LIST_HEAD(&dev->bus_list);
1236 dev->dev.type = &pci_dev_type;
1237 dev->bus = pci_bus_get(bus);
1241 EXPORT_SYMBOL(pci_alloc_dev);
1243 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1248 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1251 /* some broken boards return 0 or ~0 if a slot is empty: */
1252 if (*l == 0xffffffff || *l == 0x00000000 ||
1253 *l == 0x0000ffff || *l == 0xffff0000)
1256 /* Configuration request Retry Status */
1257 while (*l == 0xffff0001) {
1263 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1265 /* Card hasn't responded in 60 seconds? Must be stuck. */
1266 if (delay > crs_timeout) {
1267 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "
1268 "responding\n", pci_domain_nr(bus),
1269 bus->number, PCI_SLOT(devfn),
1277 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1280 * Read the config data for a PCI device, sanity-check it
1281 * and fill in the dev structure...
1283 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1285 struct pci_dev *dev;
1288 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1291 dev = pci_alloc_dev(bus);
1296 dev->vendor = l & 0xffff;
1297 dev->device = (l >> 16) & 0xffff;
1299 pci_set_of_node(dev);
1301 if (pci_setup_device(dev)) {
1302 pci_bus_put(dev->bus);
1310 static void pci_init_capabilities(struct pci_dev *dev)
1312 /* MSI/MSI-X list */
1313 pci_msi_init_pci_dev(dev);
1315 /* Buffers for saving PCIe and PCI-X capabilities */
1316 pci_allocate_cap_save_buffers(dev);
1318 /* Power Management */
1321 /* Vital Product Data */
1322 pci_vpd_pci22_init(dev);
1324 /* Alternative Routing-ID Forwarding */
1325 pci_configure_ari(dev);
1327 /* Single Root I/O Virtualization */
1330 /* Enable ACS P2P upstream forwarding */
1331 pci_enable_acs(dev);
1334 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1338 device_initialize(&dev->dev);
1339 dev->dev.release = pci_release_dev;
1341 set_dev_node(&dev->dev, pcibus_to_node(bus));
1342 dev->dev.dma_mask = &dev->dma_mask;
1343 dev->dev.dma_parms = &dev->dma_parms;
1344 dev->dev.coherent_dma_mask = 0xffffffffull;
1346 pci_set_dma_max_seg_size(dev, 65536);
1347 pci_set_dma_seg_boundary(dev, 0xffffffff);
1349 /* Fix up broken headers */
1350 pci_fixup_device(pci_fixup_header, dev);
1352 /* moved out from quirk header fixup code */
1353 pci_reassigndev_resource_alignment(dev);
1355 /* Clear the state_saved flag. */
1356 dev->state_saved = false;
1358 /* Initialize various capabilities */
1359 pci_init_capabilities(dev);
1362 * Add the device to our list of discovered devices
1363 * and the bus list for fixup functions, etc.
1365 down_write(&pci_bus_sem);
1366 list_add_tail(&dev->bus_list, &bus->devices);
1367 up_write(&pci_bus_sem);
1369 ret = pcibios_add_device(dev);
1372 /* Notifier could use PCI capabilities */
1373 dev->match_driver = false;
1374 ret = device_add(&dev->dev);
1378 struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
1380 struct pci_dev *dev;
1382 dev = pci_get_slot(bus, devfn);
1388 dev = pci_scan_device(bus, devfn);
1392 pci_device_add(dev, bus);
1396 EXPORT_SYMBOL(pci_scan_single_device);
1398 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1404 if (pci_ari_enabled(bus)) {
1407 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1411 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1412 next_fn = PCI_ARI_CAP_NFN(cap);
1414 return 0; /* protect against malformed list */
1419 /* dev may be NULL for non-contiguous multifunction devices */
1420 if (!dev || dev->multifunction)
1421 return (fn + 1) % 8;
1426 static int only_one_child(struct pci_bus *bus)
1428 struct pci_dev *parent = bus->self;
1430 if (!parent || !pci_is_pcie(parent))
1432 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1434 if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
1435 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1441 * pci_scan_slot - scan a PCI slot on a bus for devices.
1442 * @bus: PCI bus to scan
1443 * @devfn: slot number to scan (must have zero function.)
1445 * Scan a PCI slot on the specified PCI bus for devices, adding
1446 * discovered devices to the @bus->devices list. New devices
1447 * will not have is_added set.
1449 * Returns the number of new devices found.
1451 int pci_scan_slot(struct pci_bus *bus, int devfn)
1453 unsigned fn, nr = 0;
1454 struct pci_dev *dev;
1456 if (only_one_child(bus) && (devfn > 0))
1457 return 0; /* Already scanned the entire slot */
1459 dev = pci_scan_single_device(bus, devfn);
1465 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1466 dev = pci_scan_single_device(bus, devfn + fn);
1470 dev->multifunction = 1;
1474 /* only one slot has pcie device */
1475 if (bus->self && nr)
1476 pcie_aspm_init_link_state(bus->self);
1481 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1485 if (!pci_is_pcie(dev))
1489 * We don't have a way to change MPS settings on devices that have
1490 * drivers attached. A hot-added device might support only the minimum
1491 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
1492 * where devices may be hot-added, we limit the fabric MPS to 128 so
1493 * hot-added devices will work correctly.
1495 * However, if we hot-add a device to a slot directly below a Root
1496 * Port, it's impossible for there to be other existing devices below
1497 * the port. We don't limit the MPS in this case because we can
1498 * reconfigure MPS on both the Root Port and the hot-added device,
1499 * and there are no other devices involved.
1501 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
1503 if (dev->is_hotplug_bridge &&
1504 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1507 if (*smpss > dev->pcie_mpss)
1508 *smpss = dev->pcie_mpss;
1513 static void pcie_write_mps(struct pci_dev *dev, int mps)
1517 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1518 mps = 128 << dev->pcie_mpss;
1520 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1522 /* For "Performance", the assumption is made that
1523 * downstream communication will never be larger than
1524 * the MRRS. So, the MPS only needs to be configured
1525 * for the upstream communication. This being the case,
1526 * walk from the top down and set the MPS of the child
1527 * to that of the parent bus.
1529 * Configure the device MPS with the smaller of the
1530 * device MPSS or the bridge MPS (which is assumed to be
1531 * properly configured at this point to the largest
1532 * allowable MPS based on its parent bus).
1534 mps = min(mps, pcie_get_mps(dev->bus->self));
1537 rc = pcie_set_mps(dev, mps);
1539 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1542 static void pcie_write_mrrs(struct pci_dev *dev)
1546 /* In the "safe" case, do not configure the MRRS. There appear to be
1547 * issues with setting MRRS to 0 on a number of devices.
1549 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1552 /* For Max performance, the MRRS must be set to the largest supported
1553 * value. However, it cannot be configured larger than the MPS the
1554 * device or the bus can support. This should already be properly
1555 * configured by a prior call to pcie_write_mps.
1557 mrrs = pcie_get_mps(dev);
1559 /* MRRS is a R/W register. Invalid values can be written, but a
1560 * subsequent read will verify if the value is acceptable or not.
1561 * If the MRRS value provided is not acceptable (e.g., too large),
1562 * shrink the value until it is acceptable to the HW.
1564 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1565 rc = pcie_set_readrq(dev, mrrs);
1569 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1574 dev_err(&dev->dev, "MRRS was unable to be configured with a "
1575 "safe value. If problems are experienced, try running "
1576 "with pci=pcie_bus_safe.\n");
1579 static void pcie_bus_detect_mps(struct pci_dev *dev)
1581 struct pci_dev *bridge = dev->bus->self;
1587 mps = pcie_get_mps(dev);
1588 p_mps = pcie_get_mps(bridge);
1591 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",
1592 mps, pci_name(bridge), p_mps);
1595 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1599 if (!pci_is_pcie(dev))
1602 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1603 pcie_bus_detect_mps(dev);
1607 mps = 128 << *(u8 *)data;
1608 orig_mps = pcie_get_mps(dev);
1610 pcie_write_mps(dev, mps);
1611 pcie_write_mrrs(dev);
1613 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), "
1614 "Max Read Rq %4d\n", pcie_get_mps(dev), 128 << dev->pcie_mpss,
1615 orig_mps, pcie_get_readrq(dev));
1620 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1621 * parents then children fashion. If this changes, then this code will not
1624 void pcie_bus_configure_settings(struct pci_bus *bus)
1631 if (!pci_is_pcie(bus->self))
1634 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1635 * to be aware of the MPS of the destination. To work around this,
1636 * simply force the MPS of the entire system to the smallest possible.
1638 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1641 if (pcie_bus_config == PCIE_BUS_SAFE) {
1642 smpss = bus->self->pcie_mpss;
1644 pcie_find_smpss(bus->self, &smpss);
1645 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1648 pcie_bus_configure_set(bus->self, &smpss);
1649 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1651 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1653 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1655 unsigned int devfn, pass, max = bus->busn_res.start;
1656 struct pci_dev *dev;
1658 dev_dbg(&bus->dev, "scanning bus\n");
1660 /* Go find them, Rover! */
1661 for (devfn = 0; devfn < 0x100; devfn += 8)
1662 pci_scan_slot(bus, devfn);
1664 /* Reserve buses for SR-IOV capability. */
1665 max += pci_iov_bus_range(bus);
1668 * After performing arch-dependent fixup of the bus, look behind
1669 * all PCI-to-PCI bridges on this bus.
1671 if (!bus->is_added) {
1672 dev_dbg(&bus->dev, "fixups for bus\n");
1673 pcibios_fixup_bus(bus);
1677 for (pass=0; pass < 2; pass++)
1678 list_for_each_entry(dev, &bus->devices, bus_list) {
1679 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1680 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1681 max = pci_scan_bridge(bus, dev, max, pass);
1685 * We've scanned the bus and so we know all about what's on
1686 * the other side of any bridges that may be on this bus plus
1689 * Return how far we've got finding sub-buses.
1691 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1696 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
1697 * @bridge: Host bridge to set up.
1699 * Default empty implementation. Replace with an architecture-specific setup
1700 * routine, if necessary.
1702 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1707 void __weak pcibios_add_bus(struct pci_bus *bus)
1711 void __weak pcibios_remove_bus(struct pci_bus *bus)
1715 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
1716 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1719 struct pci_host_bridge *bridge;
1720 struct pci_bus *b, *b2;
1721 struct pci_host_bridge_window *window, *n;
1722 struct resource *res;
1723 resource_size_t offset;
1727 b = pci_alloc_bus();
1731 b->sysdata = sysdata;
1733 b->number = b->busn_res.start = bus;
1734 b2 = pci_find_bus(pci_domain_nr(b), bus);
1736 /* If we already got to this bus through a different bridge, ignore it */
1737 dev_dbg(&b2->dev, "bus already known\n");
1741 bridge = pci_alloc_host_bridge(b);
1745 bridge->dev.parent = parent;
1746 bridge->dev.release = pci_release_host_bridge_dev;
1747 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1748 error = pcibios_root_bridge_prepare(bridge);
1754 error = device_register(&bridge->dev);
1756 put_device(&bridge->dev);
1759 b->bridge = get_device(&bridge->dev);
1760 device_enable_async_suspend(b->bridge);
1761 pci_set_bus_of_node(b);
1764 set_dev_node(b->bridge, pcibus_to_node(b));
1766 b->dev.class = &pcibus_class;
1767 b->dev.parent = b->bridge;
1768 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1769 error = device_register(&b->dev);
1771 goto class_dev_reg_err;
1775 /* Create legacy_io and legacy_mem files for this bus */
1776 pci_create_legacy_files(b);
1779 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
1781 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
1783 /* Add initial resources to the bus */
1784 list_for_each_entry_safe(window, n, resources, list) {
1785 list_move_tail(&window->list, &bridge->windows);
1787 offset = window->offset;
1788 if (res->flags & IORESOURCE_BUS)
1789 pci_bus_insert_busn_res(b, bus, res->end);
1791 pci_bus_add_resource(b, res, 0);
1793 if (resource_type(res) == IORESOURCE_IO)
1794 fmt = " (bus address [%#06llx-%#06llx])";
1796 fmt = " (bus address [%#010llx-%#010llx])";
1797 snprintf(bus_addr, sizeof(bus_addr), fmt,
1798 (unsigned long long) (res->start - offset),
1799 (unsigned long long) (res->end - offset));
1802 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
1805 down_write(&pci_bus_sem);
1806 list_add_tail(&b->node, &pci_root_buses);
1807 up_write(&pci_bus_sem);
1812 put_device(&bridge->dev);
1813 device_unregister(&bridge->dev);
1819 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
1821 struct resource *res = &b->busn_res;
1822 struct resource *parent_res, *conflict;
1826 res->flags = IORESOURCE_BUS;
1828 if (!pci_is_root_bus(b))
1829 parent_res = &b->parent->busn_res;
1831 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
1832 res->flags |= IORESOURCE_PCI_FIXED;
1835 conflict = request_resource_conflict(parent_res, res);
1838 dev_printk(KERN_DEBUG, &b->dev,
1839 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
1840 res, pci_is_root_bus(b) ? "domain " : "",
1841 parent_res, conflict->name, conflict);
1843 return conflict == NULL;
1846 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
1848 struct resource *res = &b->busn_res;
1849 struct resource old_res = *res;
1850 resource_size_t size;
1853 if (res->start > bus_max)
1856 size = bus_max - res->start + 1;
1857 ret = adjust_resource(res, res->start, size);
1858 dev_printk(KERN_DEBUG, &b->dev,
1859 "busn_res: %pR end %s updated to %02x\n",
1860 &old_res, ret ? "can not be" : "is", bus_max);
1862 if (!ret && !res->parent)
1863 pci_bus_insert_busn_res(b, res->start, res->end);
1868 void pci_bus_release_busn_res(struct pci_bus *b)
1870 struct resource *res = &b->busn_res;
1873 if (!res->flags || !res->parent)
1876 ret = release_resource(res);
1877 dev_printk(KERN_DEBUG, &b->dev,
1878 "busn_res: %pR %s released\n",
1879 res, ret ? "can not be" : "is");
1882 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
1883 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1885 struct pci_host_bridge_window *window;
1890 list_for_each_entry(window, resources, list)
1891 if (window->res->flags & IORESOURCE_BUS) {
1896 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
1902 "No busn resource found for root bus, will use [bus %02x-ff]\n",
1904 pci_bus_insert_busn_res(b, bus, 255);
1907 max = pci_scan_child_bus(b);
1910 pci_bus_update_busn_res_end(b, max);
1912 pci_bus_add_devices(b);
1915 EXPORT_SYMBOL(pci_scan_root_bus);
1917 /* Deprecated; use pci_scan_root_bus() instead */
1918 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1919 int bus, struct pci_ops *ops, void *sysdata)
1921 LIST_HEAD(resources);
1924 pci_add_resource(&resources, &ioport_resource);
1925 pci_add_resource(&resources, &iomem_resource);
1926 pci_add_resource(&resources, &busn_resource);
1927 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
1929 pci_scan_child_bus(b);
1931 pci_free_resource_list(&resources);
1934 EXPORT_SYMBOL(pci_scan_bus_parented);
1936 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
1939 LIST_HEAD(resources);
1942 pci_add_resource(&resources, &ioport_resource);
1943 pci_add_resource(&resources, &iomem_resource);
1944 pci_add_resource(&resources, &busn_resource);
1945 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
1947 pci_scan_child_bus(b);
1948 pci_bus_add_devices(b);
1950 pci_free_resource_list(&resources);
1954 EXPORT_SYMBOL(pci_scan_bus);
1957 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
1958 * @bridge: PCI bridge for the bus to scan
1960 * Scan a PCI bus and child buses for new devices, add them,
1961 * and enable them, resizing bridge mmio/io resource if necessary
1962 * and possible. The caller must ensure the child devices are already
1963 * removed for resizing to occur.
1965 * Returns the max number of subordinate bus discovered.
1967 unsigned int __ref pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
1970 struct pci_bus *bus = bridge->subordinate;
1972 max = pci_scan_child_bus(bus);
1974 pci_assign_unassigned_bridge_resources(bridge);
1976 pci_bus_add_devices(bus);
1982 * pci_rescan_bus - scan a PCI bus for devices.
1983 * @bus: PCI bus to scan
1985 * Scan a PCI bus and child buses for new devices, adds them,
1988 * Returns the max number of subordinate bus discovered.
1990 unsigned int __ref pci_rescan_bus(struct pci_bus *bus)
1994 max = pci_scan_child_bus(bus);
1995 pci_assign_unassigned_bus_resources(bus);
1996 pci_bus_add_devices(bus);
2000 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2002 EXPORT_SYMBOL(pci_add_new_bus);
2003 EXPORT_SYMBOL(pci_scan_slot);
2004 EXPORT_SYMBOL(pci_scan_bridge);
2005 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
2008 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2009 * routines should always be executed under this mutex.
2011 static DEFINE_MUTEX(pci_rescan_remove_lock);
2013 void pci_lock_rescan_remove(void)
2015 mutex_lock(&pci_rescan_remove_lock);
2017 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2019 void pci_unlock_rescan_remove(void)
2021 mutex_unlock(&pci_rescan_remove_lock);
2023 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2025 static int __init pci_sort_bf_cmp(const struct device *d_a, const struct device *d_b)
2027 const struct pci_dev *a = to_pci_dev(d_a);
2028 const struct pci_dev *b = to_pci_dev(d_b);
2030 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2031 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2033 if (a->bus->number < b->bus->number) return -1;
2034 else if (a->bus->number > b->bus->number) return 1;
2036 if (a->devfn < b->devfn) return -1;
2037 else if (a->devfn > b->devfn) return 1;
2042 void __init pci_sort_breadthfirst(void)
2044 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);