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_too_high = false, bar_invalid = 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 /* Above 32-bit boundary; try to reallocate */
258 res->flags |= IORESOURCE_UNSET;
265 region.end = l64 + sz64;
268 sz = pci_size(l, sz, mask);
277 pcibios_bus_to_resource(dev->bus, res, ®ion);
278 pcibios_resource_to_bus(dev->bus, &inverted_region, res);
281 * If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
282 * the corresponding resource address (the physical address used by
283 * the CPU. Converting that resource address back to a bus address
284 * should yield the original BAR value:
286 * resource_to_bus(bus_to_resource(A)) == A
288 * If it doesn't, CPU accesses to "bus_to_resource(A)" will not
289 * be claimed by the device.
291 if (inverted_region.start != region.start) {
292 res->flags |= IORESOURCE_UNSET;
294 res->end = region.end - region.start;
304 if (!dev->mmio_always_on &&
305 (orig_cmd & PCI_COMMAND_DECODE_ENABLE))
306 pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
309 dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
310 pos, (unsigned long long) sz64);
312 dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4G (bus address %#010llx)\n",
313 pos, (unsigned long long) l64);
315 dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n",
316 pos, (unsigned long long) region.start);
318 dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
320 return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
323 static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
325 unsigned int pos, reg;
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_CACHEABLE |
338 IORESOURCE_SIZEALIGN;
339 __pci_read_base(dev, pci_bar_mem32, res, rom);
343 static void pci_read_bridge_io(struct pci_bus *child)
345 struct pci_dev *dev = child->self;
346 u8 io_base_lo, io_limit_lo;
347 unsigned long io_mask, io_granularity, base, limit;
348 struct pci_bus_region region;
349 struct resource *res;
351 io_mask = PCI_IO_RANGE_MASK;
352 io_granularity = 0x1000;
353 if (dev->io_window_1k) {
354 /* Support 1K I/O space granularity */
355 io_mask = PCI_IO_1K_RANGE_MASK;
356 io_granularity = 0x400;
359 res = child->resource[0];
360 pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
361 pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
362 base = (io_base_lo & io_mask) << 8;
363 limit = (io_limit_lo & io_mask) << 8;
365 if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
366 u16 io_base_hi, io_limit_hi;
368 pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
369 pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
370 base |= ((unsigned long) io_base_hi << 16);
371 limit |= ((unsigned long) io_limit_hi << 16);
375 res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
377 region.end = limit + io_granularity - 1;
378 pcibios_bus_to_resource(dev->bus, res, ®ion);
379 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
383 static void pci_read_bridge_mmio(struct pci_bus *child)
385 struct pci_dev *dev = child->self;
386 u16 mem_base_lo, mem_limit_lo;
387 unsigned long base, limit;
388 struct pci_bus_region region;
389 struct resource *res;
391 res = child->resource[1];
392 pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
393 pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
394 base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
395 limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
397 res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
399 region.end = limit + 0xfffff;
400 pcibios_bus_to_resource(dev->bus, res, ®ion);
401 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
405 static void pci_read_bridge_mmio_pref(struct pci_bus *child)
407 struct pci_dev *dev = child->self;
408 u16 mem_base_lo, mem_limit_lo;
409 unsigned long 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 base = ((unsigned long) mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
417 limit = ((unsigned long) 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 #if BITS_PER_LONG == 64
432 base |= ((unsigned long) mem_base_hi) << 32;
433 limit |= ((unsigned long) mem_limit_hi) << 32;
435 if (mem_base_hi || mem_limit_hi) {
436 dev_err(&dev->dev, "can't handle 64-bit address space for bridge\n");
443 res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
444 IORESOURCE_MEM | IORESOURCE_PREFETCH;
445 if (res->flags & PCI_PREF_RANGE_TYPE_64)
446 res->flags |= IORESOURCE_MEM_64;
448 region.end = limit + 0xfffff;
449 pcibios_bus_to_resource(dev->bus, res, ®ion);
450 dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
454 void pci_read_bridge_bases(struct pci_bus *child)
456 struct pci_dev *dev = child->self;
457 struct resource *res;
460 if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
463 dev_info(&dev->dev, "PCI bridge to %pR%s\n",
465 dev->transparent ? " (subtractive decode)" : "");
467 pci_bus_remove_resources(child);
468 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
469 child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
471 pci_read_bridge_io(child);
472 pci_read_bridge_mmio(child);
473 pci_read_bridge_mmio_pref(child);
475 if (dev->transparent) {
476 pci_bus_for_each_resource(child->parent, res, i) {
477 if (res && res->flags) {
478 pci_bus_add_resource(child, res,
479 PCI_SUBTRACTIVE_DECODE);
480 dev_printk(KERN_DEBUG, &dev->dev,
481 " bridge window %pR (subtractive decode)\n",
488 static struct pci_bus *pci_alloc_bus(void)
492 b = kzalloc(sizeof(*b), GFP_KERNEL);
496 INIT_LIST_HEAD(&b->node);
497 INIT_LIST_HEAD(&b->children);
498 INIT_LIST_HEAD(&b->devices);
499 INIT_LIST_HEAD(&b->slots);
500 INIT_LIST_HEAD(&b->resources);
501 b->max_bus_speed = PCI_SPEED_UNKNOWN;
502 b->cur_bus_speed = PCI_SPEED_UNKNOWN;
506 static void pci_release_host_bridge_dev(struct device *dev)
508 struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
510 if (bridge->release_fn)
511 bridge->release_fn(bridge);
513 pci_free_resource_list(&bridge->windows);
518 static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
520 struct pci_host_bridge *bridge;
522 bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
526 INIT_LIST_HEAD(&bridge->windows);
531 static const unsigned char pcix_bus_speed[] = {
532 PCI_SPEED_UNKNOWN, /* 0 */
533 PCI_SPEED_66MHz_PCIX, /* 1 */
534 PCI_SPEED_100MHz_PCIX, /* 2 */
535 PCI_SPEED_133MHz_PCIX, /* 3 */
536 PCI_SPEED_UNKNOWN, /* 4 */
537 PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
538 PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
539 PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
540 PCI_SPEED_UNKNOWN, /* 8 */
541 PCI_SPEED_66MHz_PCIX_266, /* 9 */
542 PCI_SPEED_100MHz_PCIX_266, /* A */
543 PCI_SPEED_133MHz_PCIX_266, /* B */
544 PCI_SPEED_UNKNOWN, /* C */
545 PCI_SPEED_66MHz_PCIX_533, /* D */
546 PCI_SPEED_100MHz_PCIX_533, /* E */
547 PCI_SPEED_133MHz_PCIX_533 /* F */
550 const unsigned char pcie_link_speed[] = {
551 PCI_SPEED_UNKNOWN, /* 0 */
552 PCIE_SPEED_2_5GT, /* 1 */
553 PCIE_SPEED_5_0GT, /* 2 */
554 PCIE_SPEED_8_0GT, /* 3 */
555 PCI_SPEED_UNKNOWN, /* 4 */
556 PCI_SPEED_UNKNOWN, /* 5 */
557 PCI_SPEED_UNKNOWN, /* 6 */
558 PCI_SPEED_UNKNOWN, /* 7 */
559 PCI_SPEED_UNKNOWN, /* 8 */
560 PCI_SPEED_UNKNOWN, /* 9 */
561 PCI_SPEED_UNKNOWN, /* A */
562 PCI_SPEED_UNKNOWN, /* B */
563 PCI_SPEED_UNKNOWN, /* C */
564 PCI_SPEED_UNKNOWN, /* D */
565 PCI_SPEED_UNKNOWN, /* E */
566 PCI_SPEED_UNKNOWN /* F */
569 void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
571 bus->cur_bus_speed = pcie_link_speed[linksta & PCI_EXP_LNKSTA_CLS];
573 EXPORT_SYMBOL_GPL(pcie_update_link_speed);
575 static unsigned char agp_speeds[] = {
583 static enum pci_bus_speed agp_speed(int agp3, int agpstat)
589 else if (agpstat & 2)
591 else if (agpstat & 1)
603 return agp_speeds[index];
606 static void pci_set_bus_speed(struct pci_bus *bus)
608 struct pci_dev *bridge = bus->self;
611 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
613 pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
617 pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
618 bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
620 pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
621 bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
624 pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
627 enum pci_bus_speed max;
629 pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
632 if (status & PCI_X_SSTATUS_533MHZ) {
633 max = PCI_SPEED_133MHz_PCIX_533;
634 } else if (status & PCI_X_SSTATUS_266MHZ) {
635 max = PCI_SPEED_133MHz_PCIX_266;
636 } else if (status & PCI_X_SSTATUS_133MHZ) {
637 if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
638 max = PCI_SPEED_133MHz_PCIX_ECC;
640 max = PCI_SPEED_133MHz_PCIX;
642 max = PCI_SPEED_66MHz_PCIX;
645 bus->max_bus_speed = max;
646 bus->cur_bus_speed = pcix_bus_speed[
647 (status & PCI_X_SSTATUS_FREQ) >> 6];
652 if (pci_is_pcie(bridge)) {
656 pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
657 bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
659 pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
660 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 *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev,
731 struct pci_bus *child;
733 child = pci_alloc_child_bus(parent, dev, busnr);
735 down_write(&pci_bus_sem);
736 list_add_tail(&child->node, &parent->children);
737 up_write(&pci_bus_sem);
741 EXPORT_SYMBOL(pci_add_new_bus);
744 * If it's a bridge, configure it and scan the bus behind it.
745 * For CardBus bridges, we don't scan behind as the devices will
746 * be handled by the bridge driver itself.
748 * We need to process bridges in two passes -- first we scan those
749 * already configured by the BIOS and after we are done with all of
750 * them, we proceed to assigning numbers to the remaining buses in
751 * order to avoid overlaps between old and new bus numbers.
753 int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
755 struct pci_bus *child;
756 int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
759 u8 primary, secondary, subordinate;
762 pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
763 primary = buses & 0xFF;
764 secondary = (buses >> 8) & 0xFF;
765 subordinate = (buses >> 16) & 0xFF;
767 dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
768 secondary, subordinate, pass);
770 if (!primary && (primary != bus->number) && secondary && subordinate) {
771 dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
772 primary = bus->number;
775 /* Check if setup is sensible at all */
777 (primary != bus->number || secondary <= bus->number ||
778 secondary > subordinate)) {
779 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
780 secondary, subordinate);
784 /* Disable MasterAbortMode during probing to avoid reporting
785 of bus errors (in some architectures) */
786 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
787 pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
788 bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
790 if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
791 !is_cardbus && !broken) {
794 * Bus already configured by firmware, process it in the first
795 * pass and just note the configuration.
801 * The bus might already exist for two reasons: Either we are
802 * rescanning the bus or the bus is reachable through more than
803 * one bridge. The second case can happen with the i450NX
806 child = pci_find_bus(pci_domain_nr(bus), secondary);
808 child = pci_add_new_bus(bus, dev, secondary);
811 child->primary = primary;
812 pci_bus_insert_busn_res(child, secondary, subordinate);
813 child->bridge_ctl = bctl;
816 cmax = pci_scan_child_bus(child);
817 if (cmax > subordinate)
818 dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
820 /* subordinate should equal child->busn_res.end */
821 if (subordinate > max)
825 * We need to assign a number to this bus which we always
826 * do in the second pass.
829 if (pcibios_assign_all_busses() || broken || is_cardbus)
830 /* Temporarily disable forwarding of the
831 configuration cycles on all bridges in
832 this bus segment to avoid possible
833 conflicts in the second pass between two
834 bridges programmed with overlapping
836 pci_write_config_dword(dev, PCI_PRIMARY_BUS,
842 pci_write_config_word(dev, PCI_STATUS, 0xffff);
844 /* Prevent assigning a bus number that already exists.
845 * This can happen when a bridge is hot-plugged, so in
846 * this case we only re-scan this bus. */
847 child = pci_find_bus(pci_domain_nr(bus), max+1);
849 child = pci_add_new_bus(bus, dev, max+1);
852 pci_bus_insert_busn_res(child, max+1, 0xff);
855 buses = (buses & 0xff000000)
856 | ((unsigned int)(child->primary) << 0)
857 | ((unsigned int)(child->busn_res.start) << 8)
858 | ((unsigned int)(child->busn_res.end) << 16);
861 * yenta.c forces a secondary latency timer of 176.
862 * Copy that behaviour here.
865 buses &= ~0xff000000;
866 buses |= CARDBUS_LATENCY_TIMER << 24;
870 * We need to blast all three values with a single write.
872 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
875 child->bridge_ctl = bctl;
876 max = pci_scan_child_bus(child);
879 * For CardBus bridges, we leave 4 bus numbers
880 * as cards with a PCI-to-PCI bridge can be
883 for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
884 struct pci_bus *parent = bus;
885 if (pci_find_bus(pci_domain_nr(bus),
888 while (parent->parent) {
889 if ((!pcibios_assign_all_busses()) &&
890 (parent->busn_res.end > max) &&
891 (parent->busn_res.end <= max+i)) {
894 parent = parent->parent;
898 * Often, there are two cardbus bridges
899 * -- try to leave one valid bus number
909 * Set the subordinate bus number to its real value.
911 pci_bus_update_busn_res_end(child, max);
912 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
916 (is_cardbus ? "PCI CardBus %04x:%02x" : "PCI Bus %04x:%02x"),
917 pci_domain_nr(bus), child->number);
919 /* Has only triggered on CardBus, fixup is in yenta_socket */
920 while (bus->parent) {
921 if ((child->busn_res.end > bus->busn_res.end) ||
922 (child->number > bus->busn_res.end) ||
923 (child->number < bus->number) ||
924 (child->busn_res.end < bus->number)) {
925 dev_info(&child->dev, "%pR %s hidden behind%s bridge %s %pR\n",
927 (bus->number > child->busn_res.end &&
928 bus->busn_res.end < child->number) ?
929 "wholly" : "partially",
930 bus->self->transparent ? " transparent" : "",
938 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
942 EXPORT_SYMBOL(pci_scan_bridge);
945 * Read interrupt line and base address registers.
946 * The architecture-dependent code can tweak these, of course.
948 static void pci_read_irq(struct pci_dev *dev)
952 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &irq);
955 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &irq);
959 void set_pcie_port_type(struct pci_dev *pdev)
964 pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
967 pdev->pcie_cap = pos;
968 pci_read_config_word(pdev, pos + PCI_EXP_FLAGS, ®16);
969 pdev->pcie_flags_reg = reg16;
970 pci_read_config_word(pdev, pos + PCI_EXP_DEVCAP, ®16);
971 pdev->pcie_mpss = reg16 & PCI_EXP_DEVCAP_PAYLOAD;
974 void set_pcie_hotplug_bridge(struct pci_dev *pdev)
978 pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32);
979 if (reg32 & PCI_EXP_SLTCAP_HPC)
980 pdev->is_hotplug_bridge = 1;
984 * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
987 * PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
988 * when forwarding a type1 configuration request the bridge must check that
989 * the extended register address field is zero. The bridge is not permitted
990 * to forward the transactions and must handle it as an Unsupported Request.
991 * Some bridges do not follow this rule and simply drop the extended register
992 * bits, resulting in the standard config space being aliased, every 256
993 * bytes across the entire configuration space. Test for this condition by
994 * comparing the first dword of each potential alias to the vendor/device ID.
996 * ASM1083/1085 PCIe-to-PCI Reversible Bridge (1b21:1080, rev 01 & 03)
997 * AMD/ATI SBx00 PCI to PCI Bridge (1002:4384, rev 40)
999 static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
1001 #ifdef CONFIG_PCI_QUIRKS
1005 pci_read_config_dword(dev, PCI_VENDOR_ID, &header);
1007 for (pos = PCI_CFG_SPACE_SIZE;
1008 pos < PCI_CFG_SPACE_EXP_SIZE; pos += PCI_CFG_SPACE_SIZE) {
1009 if (pci_read_config_dword(dev, pos, &tmp) != PCIBIOS_SUCCESSFUL
1021 * pci_cfg_space_size - get the configuration space size of the PCI device.
1024 * Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
1025 * have 4096 bytes. Even if the device is capable, that doesn't mean we can
1026 * access it. Maybe we don't have a way to generate extended config space
1027 * accesses, or the device is behind a reverse Express bridge. So we try
1028 * reading the dword at 0x100 which must either be 0 or a valid extended
1029 * capability header.
1031 static int pci_cfg_space_size_ext(struct pci_dev *dev)
1034 int pos = PCI_CFG_SPACE_SIZE;
1036 if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
1038 if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
1041 return PCI_CFG_SPACE_EXP_SIZE;
1044 return PCI_CFG_SPACE_SIZE;
1047 int pci_cfg_space_size(struct pci_dev *dev)
1053 class = dev->class >> 8;
1054 if (class == PCI_CLASS_BRIDGE_HOST)
1055 return pci_cfg_space_size_ext(dev);
1057 if (!pci_is_pcie(dev)) {
1058 pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
1062 pci_read_config_dword(dev, pos + PCI_X_STATUS, &status);
1063 if (!(status & (PCI_X_STATUS_266MHZ | PCI_X_STATUS_533MHZ)))
1067 return pci_cfg_space_size_ext(dev);
1070 return PCI_CFG_SPACE_SIZE;
1073 #define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
1076 * pci_setup_device - fill in class and map information of a device
1077 * @dev: the device structure to fill
1079 * Initialize the device structure with information about the device's
1080 * vendor,class,memory and IO-space addresses,IRQ lines etc.
1081 * Called at initialisation of the PCI subsystem and by CardBus services.
1082 * Returns 0 on success and negative if unknown type of device (not normal,
1083 * bridge or CardBus).
1085 int pci_setup_device(struct pci_dev *dev)
1089 struct pci_slot *slot;
1091 struct pci_bus_region region;
1092 struct resource *res;
1094 if (pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type))
1097 dev->sysdata = dev->bus->sysdata;
1098 dev->dev.parent = dev->bus->bridge;
1099 dev->dev.bus = &pci_bus_type;
1100 dev->hdr_type = hdr_type & 0x7f;
1101 dev->multifunction = !!(hdr_type & 0x80);
1102 dev->error_state = pci_channel_io_normal;
1103 set_pcie_port_type(dev);
1105 list_for_each_entry(slot, &dev->bus->slots, list)
1106 if (PCI_SLOT(dev->devfn) == slot->number)
1109 /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
1110 set this higher, assuming the system even supports it. */
1111 dev->dma_mask = 0xffffffff;
1113 dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
1114 dev->bus->number, PCI_SLOT(dev->devfn),
1115 PCI_FUNC(dev->devfn));
1117 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
1118 dev->revision = class & 0xff;
1119 dev->class = class >> 8; /* upper 3 bytes */
1121 dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
1122 dev->vendor, dev->device, dev->hdr_type, dev->class);
1124 /* need to have dev->class ready */
1125 dev->cfg_size = pci_cfg_space_size(dev);
1127 /* "Unknown power state" */
1128 dev->current_state = PCI_UNKNOWN;
1130 /* Early fixups, before probing the BARs */
1131 pci_fixup_device(pci_fixup_early, dev);
1132 /* device class may be changed after fixup */
1133 class = dev->class >> 8;
1135 switch (dev->hdr_type) { /* header type */
1136 case PCI_HEADER_TYPE_NORMAL: /* standard header */
1137 if (class == PCI_CLASS_BRIDGE_PCI)
1140 pci_read_bases(dev, 6, PCI_ROM_ADDRESS);
1141 pci_read_config_word(dev, PCI_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1142 pci_read_config_word(dev, PCI_SUBSYSTEM_ID, &dev->subsystem_device);
1145 * Do the ugly legacy mode stuff here rather than broken chip
1146 * quirk code. Legacy mode ATA controllers have fixed
1147 * addresses. These are not always echoed in BAR0-3, and
1148 * BAR0-3 in a few cases contain junk!
1150 if (class == PCI_CLASS_STORAGE_IDE) {
1152 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
1153 if ((progif & 1) == 0) {
1154 region.start = 0x1F0;
1156 res = &dev->resource[0];
1157 res->flags = LEGACY_IO_RESOURCE;
1158 pcibios_bus_to_resource(dev->bus, res, ®ion);
1159 dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
1161 region.start = 0x3F6;
1163 res = &dev->resource[1];
1164 res->flags = LEGACY_IO_RESOURCE;
1165 pcibios_bus_to_resource(dev->bus, res, ®ion);
1166 dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
1169 if ((progif & 4) == 0) {
1170 region.start = 0x170;
1172 res = &dev->resource[2];
1173 res->flags = LEGACY_IO_RESOURCE;
1174 pcibios_bus_to_resource(dev->bus, res, ®ion);
1175 dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
1177 region.start = 0x376;
1179 res = &dev->resource[3];
1180 res->flags = LEGACY_IO_RESOURCE;
1181 pcibios_bus_to_resource(dev->bus, res, ®ion);
1182 dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
1188 case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
1189 if (class != PCI_CLASS_BRIDGE_PCI)
1191 /* The PCI-to-PCI bridge spec requires that subtractive
1192 decoding (i.e. transparent) bridge must have programming
1193 interface code of 0x01. */
1195 dev->transparent = ((dev->class & 0xff) == 1);
1196 pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
1197 set_pcie_hotplug_bridge(dev);
1198 pos = pci_find_capability(dev, PCI_CAP_ID_SSVID);
1200 pci_read_config_word(dev, pos + PCI_SSVID_VENDOR_ID, &dev->subsystem_vendor);
1201 pci_read_config_word(dev, pos + PCI_SSVID_DEVICE_ID, &dev->subsystem_device);
1205 case PCI_HEADER_TYPE_CARDBUS: /* CardBus bridge header */
1206 if (class != PCI_CLASS_BRIDGE_CARDBUS)
1209 pci_read_bases(dev, 1, 0);
1210 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_VENDOR_ID, &dev->subsystem_vendor);
1211 pci_read_config_word(dev, PCI_CB_SUBSYSTEM_ID, &dev->subsystem_device);
1214 default: /* unknown header */
1215 dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
1220 dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
1221 dev->class, dev->hdr_type);
1222 dev->class = PCI_CLASS_NOT_DEFINED;
1225 /* We found a fine healthy device, go go go... */
1229 static void pci_release_capabilities(struct pci_dev *dev)
1231 pci_vpd_release(dev);
1232 pci_iov_release(dev);
1233 pci_free_cap_save_buffers(dev);
1237 * pci_release_dev - free a pci device structure when all users of it are finished.
1238 * @dev: device that's been disconnected
1240 * Will be called only by the device core when all users of this pci device are
1243 static void pci_release_dev(struct device *dev)
1245 struct pci_dev *pci_dev;
1247 pci_dev = to_pci_dev(dev);
1248 pci_release_capabilities(pci_dev);
1249 pci_release_of_node(pci_dev);
1250 pcibios_release_device(pci_dev);
1251 pci_bus_put(pci_dev->bus);
1252 kfree(pci_dev->driver_override);
1256 struct pci_dev *pci_alloc_dev(struct pci_bus *bus)
1258 struct pci_dev *dev;
1260 dev = kzalloc(sizeof(struct pci_dev), GFP_KERNEL);
1264 INIT_LIST_HEAD(&dev->bus_list);
1265 dev->dev.type = &pci_dev_type;
1266 dev->bus = pci_bus_get(bus);
1270 EXPORT_SYMBOL(pci_alloc_dev);
1272 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
1277 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1280 /* some broken boards return 0 or ~0 if a slot is empty: */
1281 if (*l == 0xffffffff || *l == 0x00000000 ||
1282 *l == 0x0000ffff || *l == 0xffff0000)
1285 /* Configuration request Retry Status */
1286 while (*l == 0xffff0001) {
1292 if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
1294 /* Card hasn't responded in 60 seconds? Must be stuck. */
1295 if (delay > crs_timeout) {
1296 printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not responding\n",
1297 pci_domain_nr(bus), bus->number, PCI_SLOT(devfn),
1305 EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
1308 * Read the config data for a PCI device, sanity-check it
1309 * and fill in the dev structure...
1311 static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
1313 struct pci_dev *dev;
1316 if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))
1319 dev = pci_alloc_dev(bus);
1324 dev->vendor = l & 0xffff;
1325 dev->device = (l >> 16) & 0xffff;
1327 pci_set_of_node(dev);
1329 if (pci_setup_device(dev)) {
1330 pci_bus_put(dev->bus);
1338 static void pci_init_capabilities(struct pci_dev *dev)
1340 /* MSI/MSI-X list */
1341 pci_msi_init_pci_dev(dev);
1343 /* Buffers for saving PCIe and PCI-X capabilities */
1344 pci_allocate_cap_save_buffers(dev);
1346 /* Power Management */
1349 /* Vital Product Data */
1350 pci_vpd_pci22_init(dev);
1352 /* Alternative Routing-ID Forwarding */
1353 pci_configure_ari(dev);
1355 /* Single Root I/O Virtualization */
1358 /* Enable ACS P2P upstream forwarding */
1359 pci_enable_acs(dev);
1362 void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
1366 device_initialize(&dev->dev);
1367 dev->dev.release = pci_release_dev;
1369 set_dev_node(&dev->dev, pcibus_to_node(bus));
1370 dev->dev.dma_mask = &dev->dma_mask;
1371 dev->dev.dma_parms = &dev->dma_parms;
1372 dev->dev.coherent_dma_mask = 0xffffffffull;
1374 pci_set_dma_max_seg_size(dev, 65536);
1375 pci_set_dma_seg_boundary(dev, 0xffffffff);
1377 /* Fix up broken headers */
1378 pci_fixup_device(pci_fixup_header, dev);
1380 /* moved out from quirk header fixup code */
1381 pci_reassigndev_resource_alignment(dev);
1383 /* Clear the state_saved flag. */
1384 dev->state_saved = false;
1386 /* Initialize various capabilities */
1387 pci_init_capabilities(dev);
1390 * Add the device to our list of discovered devices
1391 * and the bus list for fixup functions, etc.
1393 down_write(&pci_bus_sem);
1394 list_add_tail(&dev->bus_list, &bus->devices);
1395 up_write(&pci_bus_sem);
1397 ret = pcibios_add_device(dev);
1400 /* Notifier could use PCI capabilities */
1401 dev->match_driver = false;
1402 ret = device_add(&dev->dev);
1406 struct pci_dev *pci_scan_single_device(struct pci_bus *bus, int devfn)
1408 struct pci_dev *dev;
1410 dev = pci_get_slot(bus, devfn);
1416 dev = pci_scan_device(bus, devfn);
1420 pci_device_add(dev, bus);
1424 EXPORT_SYMBOL(pci_scan_single_device);
1426 static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
1432 if (pci_ari_enabled(bus)) {
1435 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI);
1439 pci_read_config_word(dev, pos + PCI_ARI_CAP, &cap);
1440 next_fn = PCI_ARI_CAP_NFN(cap);
1442 return 0; /* protect against malformed list */
1447 /* dev may be NULL for non-contiguous multifunction devices */
1448 if (!dev || dev->multifunction)
1449 return (fn + 1) % 8;
1454 static int only_one_child(struct pci_bus *bus)
1456 struct pci_dev *parent = bus->self;
1458 if (!parent || !pci_is_pcie(parent))
1460 if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
1462 if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
1463 !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
1469 * pci_scan_slot - scan a PCI slot on a bus for devices.
1470 * @bus: PCI bus to scan
1471 * @devfn: slot number to scan (must have zero function.)
1473 * Scan a PCI slot on the specified PCI bus for devices, adding
1474 * discovered devices to the @bus->devices list. New devices
1475 * will not have is_added set.
1477 * Returns the number of new devices found.
1479 int pci_scan_slot(struct pci_bus *bus, int devfn)
1481 unsigned fn, nr = 0;
1482 struct pci_dev *dev;
1484 if (only_one_child(bus) && (devfn > 0))
1485 return 0; /* Already scanned the entire slot */
1487 dev = pci_scan_single_device(bus, devfn);
1493 for (fn = next_fn(bus, dev, 0); fn > 0; fn = next_fn(bus, dev, fn)) {
1494 dev = pci_scan_single_device(bus, devfn + fn);
1498 dev->multifunction = 1;
1502 /* only one slot has pcie device */
1503 if (bus->self && nr)
1504 pcie_aspm_init_link_state(bus->self);
1508 EXPORT_SYMBOL(pci_scan_slot);
1510 static int pcie_find_smpss(struct pci_dev *dev, void *data)
1514 if (!pci_is_pcie(dev))
1518 * We don't have a way to change MPS settings on devices that have
1519 * drivers attached. A hot-added device might support only the minimum
1520 * MPS setting (MPS=128). Therefore, if the fabric contains a bridge
1521 * where devices may be hot-added, we limit the fabric MPS to 128 so
1522 * hot-added devices will work correctly.
1524 * However, if we hot-add a device to a slot directly below a Root
1525 * Port, it's impossible for there to be other existing devices below
1526 * the port. We don't limit the MPS in this case because we can
1527 * reconfigure MPS on both the Root Port and the hot-added device,
1528 * and there are no other devices involved.
1530 * Note that this PCIE_BUS_SAFE path assumes no peer-to-peer DMA.
1532 if (dev->is_hotplug_bridge &&
1533 pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
1536 if (*smpss > dev->pcie_mpss)
1537 *smpss = dev->pcie_mpss;
1542 static void pcie_write_mps(struct pci_dev *dev, int mps)
1546 if (pcie_bus_config == PCIE_BUS_PERFORMANCE) {
1547 mps = 128 << dev->pcie_mpss;
1549 if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
1551 /* For "Performance", the assumption is made that
1552 * downstream communication will never be larger than
1553 * the MRRS. So, the MPS only needs to be configured
1554 * for the upstream communication. This being the case,
1555 * walk from the top down and set the MPS of the child
1556 * to that of the parent bus.
1558 * Configure the device MPS with the smaller of the
1559 * device MPSS or the bridge MPS (which is assumed to be
1560 * properly configured at this point to the largest
1561 * allowable MPS based on its parent bus).
1563 mps = min(mps, pcie_get_mps(dev->bus->self));
1566 rc = pcie_set_mps(dev, mps);
1568 dev_err(&dev->dev, "Failed attempting to set the MPS\n");
1571 static void pcie_write_mrrs(struct pci_dev *dev)
1575 /* In the "safe" case, do not configure the MRRS. There appear to be
1576 * issues with setting MRRS to 0 on a number of devices.
1578 if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
1581 /* For Max performance, the MRRS must be set to the largest supported
1582 * value. However, it cannot be configured larger than the MPS the
1583 * device or the bus can support. This should already be properly
1584 * configured by a prior call to pcie_write_mps.
1586 mrrs = pcie_get_mps(dev);
1588 /* MRRS is a R/W register. Invalid values can be written, but a
1589 * subsequent read will verify if the value is acceptable or not.
1590 * If the MRRS value provided is not acceptable (e.g., too large),
1591 * shrink the value until it is acceptable to the HW.
1593 while (mrrs != pcie_get_readrq(dev) && mrrs >= 128) {
1594 rc = pcie_set_readrq(dev, mrrs);
1598 dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
1603 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");
1606 static void pcie_bus_detect_mps(struct pci_dev *dev)
1608 struct pci_dev *bridge = dev->bus->self;
1614 mps = pcie_get_mps(dev);
1615 p_mps = pcie_get_mps(bridge);
1618 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",
1619 mps, pci_name(bridge), p_mps);
1622 static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
1626 if (!pci_is_pcie(dev))
1629 if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
1630 pcie_bus_detect_mps(dev);
1634 mps = 128 << *(u8 *)data;
1635 orig_mps = pcie_get_mps(dev);
1637 pcie_write_mps(dev, mps);
1638 pcie_write_mrrs(dev);
1640 dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
1641 pcie_get_mps(dev), 128 << dev->pcie_mpss,
1642 orig_mps, pcie_get_readrq(dev));
1647 /* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
1648 * parents then children fashion. If this changes, then this code will not
1651 void pcie_bus_configure_settings(struct pci_bus *bus)
1658 if (!pci_is_pcie(bus->self))
1661 /* FIXME - Peer to peer DMA is possible, though the endpoint would need
1662 * to be aware of the MPS of the destination. To work around this,
1663 * simply force the MPS of the entire system to the smallest possible.
1665 if (pcie_bus_config == PCIE_BUS_PEER2PEER)
1668 if (pcie_bus_config == PCIE_BUS_SAFE) {
1669 smpss = bus->self->pcie_mpss;
1671 pcie_find_smpss(bus->self, &smpss);
1672 pci_walk_bus(bus, pcie_find_smpss, &smpss);
1675 pcie_bus_configure_set(bus->self, &smpss);
1676 pci_walk_bus(bus, pcie_bus_configure_set, &smpss);
1678 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
1680 unsigned int pci_scan_child_bus(struct pci_bus *bus)
1682 unsigned int devfn, pass, max = bus->busn_res.start;
1683 struct pci_dev *dev;
1685 dev_dbg(&bus->dev, "scanning bus\n");
1687 /* Go find them, Rover! */
1688 for (devfn = 0; devfn < 0x100; devfn += 8)
1689 pci_scan_slot(bus, devfn);
1691 /* Reserve buses for SR-IOV capability. */
1692 max += pci_iov_bus_range(bus);
1695 * After performing arch-dependent fixup of the bus, look behind
1696 * all PCI-to-PCI bridges on this bus.
1698 if (!bus->is_added) {
1699 dev_dbg(&bus->dev, "fixups for bus\n");
1700 pcibios_fixup_bus(bus);
1704 for (pass = 0; pass < 2; pass++)
1705 list_for_each_entry(dev, &bus->devices, bus_list) {
1706 if (pci_is_bridge(dev))
1707 max = pci_scan_bridge(bus, dev, max, pass);
1711 * We've scanned the bus and so we know all about what's on
1712 * the other side of any bridges that may be on this bus plus
1715 * Return how far we've got finding sub-buses.
1717 dev_dbg(&bus->dev, "bus scan returning with max=%02x\n", max);
1720 EXPORT_SYMBOL_GPL(pci_scan_child_bus);
1723 * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
1724 * @bridge: Host bridge to set up.
1726 * Default empty implementation. Replace with an architecture-specific setup
1727 * routine, if necessary.
1729 int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
1734 void __weak pcibios_add_bus(struct pci_bus *bus)
1738 void __weak pcibios_remove_bus(struct pci_bus *bus)
1742 struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
1743 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1746 struct pci_host_bridge *bridge;
1747 struct pci_bus *b, *b2;
1748 struct pci_host_bridge_window *window, *n;
1749 struct resource *res;
1750 resource_size_t offset;
1754 b = pci_alloc_bus();
1758 b->sysdata = sysdata;
1760 b->number = b->busn_res.start = bus;
1761 b2 = pci_find_bus(pci_domain_nr(b), bus);
1763 /* If we already got to this bus through a different bridge, ignore it */
1764 dev_dbg(&b2->dev, "bus already known\n");
1768 bridge = pci_alloc_host_bridge(b);
1772 bridge->dev.parent = parent;
1773 bridge->dev.release = pci_release_host_bridge_dev;
1774 dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
1775 error = pcibios_root_bridge_prepare(bridge);
1781 error = device_register(&bridge->dev);
1783 put_device(&bridge->dev);
1786 b->bridge = get_device(&bridge->dev);
1787 device_enable_async_suspend(b->bridge);
1788 pci_set_bus_of_node(b);
1791 set_dev_node(b->bridge, pcibus_to_node(b));
1793 b->dev.class = &pcibus_class;
1794 b->dev.parent = b->bridge;
1795 dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
1796 error = device_register(&b->dev);
1798 goto class_dev_reg_err;
1802 /* Create legacy_io and legacy_mem files for this bus */
1803 pci_create_legacy_files(b);
1806 dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
1808 printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
1810 /* Add initial resources to the bus */
1811 list_for_each_entry_safe(window, n, resources, list) {
1812 list_move_tail(&window->list, &bridge->windows);
1814 offset = window->offset;
1815 if (res->flags & IORESOURCE_BUS)
1816 pci_bus_insert_busn_res(b, bus, res->end);
1818 pci_bus_add_resource(b, res, 0);
1820 if (resource_type(res) == IORESOURCE_IO)
1821 fmt = " (bus address [%#06llx-%#06llx])";
1823 fmt = " (bus address [%#010llx-%#010llx])";
1824 snprintf(bus_addr, sizeof(bus_addr), fmt,
1825 (unsigned long long) (res->start - offset),
1826 (unsigned long long) (res->end - offset));
1829 dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
1832 down_write(&pci_bus_sem);
1833 list_add_tail(&b->node, &pci_root_buses);
1834 up_write(&pci_bus_sem);
1839 put_device(&bridge->dev);
1840 device_unregister(&bridge->dev);
1846 int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
1848 struct resource *res = &b->busn_res;
1849 struct resource *parent_res, *conflict;
1853 res->flags = IORESOURCE_BUS;
1855 if (!pci_is_root_bus(b))
1856 parent_res = &b->parent->busn_res;
1858 parent_res = get_pci_domain_busn_res(pci_domain_nr(b));
1859 res->flags |= IORESOURCE_PCI_FIXED;
1862 conflict = request_resource_conflict(parent_res, res);
1865 dev_printk(KERN_DEBUG, &b->dev,
1866 "busn_res: can not insert %pR under %s%pR (conflicts with %s %pR)\n",
1867 res, pci_is_root_bus(b) ? "domain " : "",
1868 parent_res, conflict->name, conflict);
1870 return conflict == NULL;
1873 int pci_bus_update_busn_res_end(struct pci_bus *b, int bus_max)
1875 struct resource *res = &b->busn_res;
1876 struct resource old_res = *res;
1877 resource_size_t size;
1880 if (res->start > bus_max)
1883 size = bus_max - res->start + 1;
1884 ret = adjust_resource(res, res->start, size);
1885 dev_printk(KERN_DEBUG, &b->dev,
1886 "busn_res: %pR end %s updated to %02x\n",
1887 &old_res, ret ? "can not be" : "is", bus_max);
1889 if (!ret && !res->parent)
1890 pci_bus_insert_busn_res(b, res->start, res->end);
1895 void pci_bus_release_busn_res(struct pci_bus *b)
1897 struct resource *res = &b->busn_res;
1900 if (!res->flags || !res->parent)
1903 ret = release_resource(res);
1904 dev_printk(KERN_DEBUG, &b->dev,
1905 "busn_res: %pR %s released\n",
1906 res, ret ? "can not be" : "is");
1909 struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
1910 struct pci_ops *ops, void *sysdata, struct list_head *resources)
1912 struct pci_host_bridge_window *window;
1917 list_for_each_entry(window, resources, list)
1918 if (window->res->flags & IORESOURCE_BUS) {
1923 b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
1929 "No busn resource found for root bus, will use [bus %02x-ff]\n",
1931 pci_bus_insert_busn_res(b, bus, 255);
1934 max = pci_scan_child_bus(b);
1937 pci_bus_update_busn_res_end(b, max);
1939 pci_bus_add_devices(b);
1942 EXPORT_SYMBOL(pci_scan_root_bus);
1944 /* Deprecated; use pci_scan_root_bus() instead */
1945 struct pci_bus *pci_scan_bus_parented(struct device *parent,
1946 int bus, struct pci_ops *ops, void *sysdata)
1948 LIST_HEAD(resources);
1951 pci_add_resource(&resources, &ioport_resource);
1952 pci_add_resource(&resources, &iomem_resource);
1953 pci_add_resource(&resources, &busn_resource);
1954 b = pci_create_root_bus(parent, bus, ops, sysdata, &resources);
1956 pci_scan_child_bus(b);
1958 pci_free_resource_list(&resources);
1961 EXPORT_SYMBOL(pci_scan_bus_parented);
1963 struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
1966 LIST_HEAD(resources);
1969 pci_add_resource(&resources, &ioport_resource);
1970 pci_add_resource(&resources, &iomem_resource);
1971 pci_add_resource(&resources, &busn_resource);
1972 b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
1974 pci_scan_child_bus(b);
1975 pci_bus_add_devices(b);
1977 pci_free_resource_list(&resources);
1981 EXPORT_SYMBOL(pci_scan_bus);
1984 * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
1985 * @bridge: PCI bridge for the bus to scan
1987 * Scan a PCI bus and child buses for new devices, add them,
1988 * and enable them, resizing bridge mmio/io resource if necessary
1989 * and possible. The caller must ensure the child devices are already
1990 * removed for resizing to occur.
1992 * Returns the max number of subordinate bus discovered.
1994 unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
1997 struct pci_bus *bus = bridge->subordinate;
1999 max = pci_scan_child_bus(bus);
2001 pci_assign_unassigned_bridge_resources(bridge);
2003 pci_bus_add_devices(bus);
2009 * pci_rescan_bus - scan a PCI bus for devices.
2010 * @bus: PCI bus to scan
2012 * Scan a PCI bus and child buses for new devices, adds them,
2015 * Returns the max number of subordinate bus discovered.
2017 unsigned int pci_rescan_bus(struct pci_bus *bus)
2021 max = pci_scan_child_bus(bus);
2022 pci_assign_unassigned_bus_resources(bus);
2023 pci_bus_add_devices(bus);
2027 EXPORT_SYMBOL_GPL(pci_rescan_bus);
2030 * pci_rescan_bus(), pci_rescan_bus_bridge_resize() and PCI device removal
2031 * routines should always be executed under this mutex.
2033 static DEFINE_MUTEX(pci_rescan_remove_lock);
2035 void pci_lock_rescan_remove(void)
2037 mutex_lock(&pci_rescan_remove_lock);
2039 EXPORT_SYMBOL_GPL(pci_lock_rescan_remove);
2041 void pci_unlock_rescan_remove(void)
2043 mutex_unlock(&pci_rescan_remove_lock);
2045 EXPORT_SYMBOL_GPL(pci_unlock_rescan_remove);
2047 static int __init pci_sort_bf_cmp(const struct device *d_a,
2048 const struct device *d_b)
2050 const struct pci_dev *a = to_pci_dev(d_a);
2051 const struct pci_dev *b = to_pci_dev(d_b);
2053 if (pci_domain_nr(a->bus) < pci_domain_nr(b->bus)) return -1;
2054 else if (pci_domain_nr(a->bus) > pci_domain_nr(b->bus)) return 1;
2056 if (a->bus->number < b->bus->number) return -1;
2057 else if (a->bus->number > b->bus->number) return 1;
2059 if (a->devfn < b->devfn) return -1;
2060 else if (a->devfn > b->devfn) return 1;
2065 void __init pci_sort_breadthfirst(void)
2067 bus_sort_breadthfirst(&pci_bus_type, &pci_sort_bf_cmp);