2 * drivers/pci/setup-bus.c
4 * Extruded from code written by
9 * Support routines for initializing a PCI subsystem.
14 * PCI-PCI bridges cleanup, sorted resource allocation.
16 * Converted to allocation in 3 passes, which gives
17 * tighter packing. Prefetchable range support.
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/pci.h>
24 #include <linux/errno.h>
25 #include <linux/ioport.h>
26 #include <linux/cache.h>
27 #include <linux/slab.h>
28 #include <asm-generic/pci-bridge.h>
31 unsigned int pci_flags;
33 struct pci_dev_resource {
34 struct list_head list;
37 resource_size_t start;
39 resource_size_t add_size;
40 resource_size_t min_align;
44 static void free_list(struct list_head *head)
46 struct pci_dev_resource *dev_res, *tmp;
48 list_for_each_entry_safe(dev_res, tmp, head, list) {
49 list_del(&dev_res->list);
55 * add_to_list() - add a new resource tracker to the list
56 * @head: Head of the list
57 * @dev: device corresponding to which the resource
59 * @res: The resource to be tracked
60 * @add_size: additional size to be optionally added
63 static int add_to_list(struct list_head *head,
64 struct pci_dev *dev, struct resource *res,
65 resource_size_t add_size, resource_size_t min_align)
67 struct pci_dev_resource *tmp;
69 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
71 pr_warn("add_to_list: kmalloc() failed!\n");
77 tmp->start = res->start;
79 tmp->flags = res->flags;
80 tmp->add_size = add_size;
81 tmp->min_align = min_align;
83 list_add(&tmp->list, head);
88 static void remove_from_list(struct list_head *head,
91 struct pci_dev_resource *dev_res, *tmp;
93 list_for_each_entry_safe(dev_res, tmp, head, list) {
94 if (dev_res->res == res) {
95 list_del(&dev_res->list);
102 static resource_size_t get_res_add_size(struct list_head *head,
103 struct resource *res)
105 struct pci_dev_resource *dev_res;
107 list_for_each_entry(dev_res, head, list) {
108 if (dev_res->res == res) {
109 int idx = res - &dev_res->dev->resource[0];
111 dev_printk(KERN_DEBUG, &dev_res->dev->dev,
112 "res[%d]=%pR get_res_add_size add_size %llx\n",
114 (unsigned long long)dev_res->add_size);
116 return dev_res->add_size;
123 /* Sort resources by alignment */
124 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
128 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
130 struct pci_dev_resource *dev_res, *tmp;
131 resource_size_t r_align;
134 r = &dev->resource[i];
136 if (r->flags & IORESOURCE_PCI_FIXED)
139 if (!(r->flags) || r->parent)
142 r_align = pci_resource_alignment(dev, r);
144 dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
149 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
151 panic("pdev_sort_resources(): kmalloc() failed!\n");
155 /* fallback is smallest one or list is empty*/
157 list_for_each_entry(dev_res, head, list) {
158 resource_size_t align;
160 align = pci_resource_alignment(dev_res->dev,
163 if (r_align > align) {
168 /* Insert it just before n*/
169 list_add_tail(&tmp->list, n);
173 static void __dev_sort_resources(struct pci_dev *dev,
174 struct list_head *head)
176 u16 class = dev->class >> 8;
178 /* Don't touch classless devices or host bridges or ioapics. */
179 if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
182 /* Don't touch ioapic devices already enabled by firmware */
183 if (class == PCI_CLASS_SYSTEM_PIC) {
185 pci_read_config_word(dev, PCI_COMMAND, &command);
186 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
190 pdev_sort_resources(dev, head);
193 static inline void reset_resource(struct resource *res)
201 * reassign_resources_sorted() - satisfy any additional resource requests
203 * @realloc_head : head of the list tracking requests requiring additional
205 * @head : head of the list tracking requests with allocated
208 * Walk through each element of the realloc_head and try to procure
209 * additional resources for the element, provided the element
210 * is in the head list.
212 static void reassign_resources_sorted(struct list_head *realloc_head,
213 struct list_head *head)
215 struct resource *res;
216 struct pci_dev_resource *add_res, *tmp;
217 struct pci_dev_resource *dev_res;
218 resource_size_t add_size;
221 list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
222 bool found_match = false;
225 /* skip resource that has been reset */
229 /* skip this resource if not found in head list */
230 list_for_each_entry(dev_res, head, list) {
231 if (dev_res->res == res) {
236 if (!found_match)/* just skip */
239 idx = res - &add_res->dev->resource[0];
240 add_size = add_res->add_size;
241 if (!resource_size(res)) {
242 res->start = add_res->start;
243 res->end = res->start + add_size - 1;
244 if (pci_assign_resource(add_res->dev, idx))
247 resource_size_t align = add_res->min_align;
248 res->flags |= add_res->flags &
249 (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
250 if (pci_reassign_resource(add_res->dev, idx,
252 dev_printk(KERN_DEBUG, &add_res->dev->dev,
253 "failed to add %llx res[%d]=%pR\n",
254 (unsigned long long)add_size,
258 list_del(&add_res->list);
264 * assign_requested_resources_sorted() - satisfy resource requests
266 * @head : head of the list tracking requests for resources
267 * @fail_head : head of the list tracking requests that could
270 * Satisfy resource requests of each element in the list. Add
271 * requests that could not satisfied to the failed_list.
273 static void assign_requested_resources_sorted(struct list_head *head,
274 struct list_head *fail_head)
276 struct resource *res;
277 struct pci_dev_resource *dev_res;
280 list_for_each_entry(dev_res, head, list) {
282 idx = res - &dev_res->dev->resource[0];
283 if (resource_size(res) &&
284 pci_assign_resource(dev_res->dev, idx)) {
287 * if the failed res is for ROM BAR, and it will
288 * be enabled later, don't add it to the list
290 if (!((idx == PCI_ROM_RESOURCE) &&
291 (!(res->flags & IORESOURCE_ROM_ENABLE))))
292 add_to_list(fail_head,
302 static unsigned long pci_fail_res_type_mask(struct list_head *fail_head)
304 struct pci_dev_resource *fail_res;
305 unsigned long mask = 0;
307 /* check failed type */
308 list_for_each_entry(fail_res, fail_head, list)
309 mask |= fail_res->flags;
312 * one pref failed resource will set IORESOURCE_MEM,
313 * as we can allocate pref in non-pref range.
314 * Will release all assigned non-pref sibling resources
315 * according to that bit.
317 return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH);
320 static bool pci_need_to_release(unsigned long mask, struct resource *res)
322 if (res->flags & IORESOURCE_IO)
323 return !!(mask & IORESOURCE_IO);
325 /* check pref at first */
326 if (res->flags & IORESOURCE_PREFETCH) {
327 if (mask & IORESOURCE_PREFETCH)
329 /* count pref if its parent is non-pref */
330 else if ((mask & IORESOURCE_MEM) &&
331 !(res->parent->flags & IORESOURCE_PREFETCH))
337 if (res->flags & IORESOURCE_MEM)
338 return !!(mask & IORESOURCE_MEM);
340 return false; /* should not get here */
343 static void __assign_resources_sorted(struct list_head *head,
344 struct list_head *realloc_head,
345 struct list_head *fail_head)
348 * Should not assign requested resources at first.
349 * they could be adjacent, so later reassign can not reallocate
350 * them one by one in parent resource window.
351 * Try to assign requested + add_size at beginning
352 * if could do that, could get out early.
353 * if could not do that, we still try to assign requested at first,
354 * then try to reassign add_size for some resources.
356 * Separate three resource type checking if we need to release
357 * assigned resource after requested + add_size try.
358 * 1. if there is io port assign fail, will release assigned
360 * 2. if there is pref mmio assign fail, release assigned
362 * if assigned pref mmio's parent is non-pref mmio and there
363 * is non-pref mmio assign fail, will release that assigned
365 * 3. if there is non-pref mmio assign fail or pref mmio
366 * assigned fail, will release assigned non-pref mmio.
368 LIST_HEAD(save_head);
369 LIST_HEAD(local_fail_head);
370 struct pci_dev_resource *save_res;
371 struct pci_dev_resource *dev_res, *tmp_res;
372 unsigned long fail_type;
374 /* Check if optional add_size is there */
375 if (!realloc_head || list_empty(realloc_head))
376 goto requested_and_reassign;
378 /* Save original start, end, flags etc at first */
379 list_for_each_entry(dev_res, head, list) {
380 if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
381 free_list(&save_head);
382 goto requested_and_reassign;
386 /* Update res in head list with add_size in realloc_head list */
387 list_for_each_entry(dev_res, head, list)
388 dev_res->res->end += get_res_add_size(realloc_head,
391 /* Try updated head list with add_size added */
392 assign_requested_resources_sorted(head, &local_fail_head);
394 /* all assigned with add_size ? */
395 if (list_empty(&local_fail_head)) {
396 /* Remove head list from realloc_head list */
397 list_for_each_entry(dev_res, head, list)
398 remove_from_list(realloc_head, dev_res->res);
399 free_list(&save_head);
404 /* check failed type */
405 fail_type = pci_fail_res_type_mask(&local_fail_head);
406 /* remove not need to be released assigned res from head list etc */
407 list_for_each_entry_safe(dev_res, tmp_res, head, list)
408 if (dev_res->res->parent &&
409 !pci_need_to_release(fail_type, dev_res->res)) {
410 /* remove it from realloc_head list */
411 remove_from_list(realloc_head, dev_res->res);
412 remove_from_list(&save_head, dev_res->res);
413 list_del(&dev_res->list);
417 free_list(&local_fail_head);
418 /* Release assigned resource */
419 list_for_each_entry(dev_res, head, list)
420 if (dev_res->res->parent)
421 release_resource(dev_res->res);
422 /* Restore start/end/flags from saved list */
423 list_for_each_entry(save_res, &save_head, list) {
424 struct resource *res = save_res->res;
426 res->start = save_res->start;
427 res->end = save_res->end;
428 res->flags = save_res->flags;
430 free_list(&save_head);
432 requested_and_reassign:
433 /* Satisfy the must-have resource requests */
434 assign_requested_resources_sorted(head, fail_head);
436 /* Try to satisfy any additional optional resource
439 reassign_resources_sorted(realloc_head, head);
443 static void pdev_assign_resources_sorted(struct pci_dev *dev,
444 struct list_head *add_head,
445 struct list_head *fail_head)
449 __dev_sort_resources(dev, &head);
450 __assign_resources_sorted(&head, add_head, fail_head);
454 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
455 struct list_head *realloc_head,
456 struct list_head *fail_head)
461 list_for_each_entry(dev, &bus->devices, bus_list)
462 __dev_sort_resources(dev, &head);
464 __assign_resources_sorted(&head, realloc_head, fail_head);
467 void pci_setup_cardbus(struct pci_bus *bus)
469 struct pci_dev *bridge = bus->self;
470 struct resource *res;
471 struct pci_bus_region region;
473 dev_info(&bridge->dev, "CardBus bridge to %pR\n",
476 res = bus->resource[0];
477 pcibios_resource_to_bus(bridge->bus, ®ion, res);
478 if (res->flags & IORESOURCE_IO) {
480 * The IO resource is allocated a range twice as large as it
481 * would normally need. This allows us to set both IO regs.
483 dev_info(&bridge->dev, " bridge window %pR\n", res);
484 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
486 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
490 res = bus->resource[1];
491 pcibios_resource_to_bus(bridge->bus, ®ion, res);
492 if (res->flags & IORESOURCE_IO) {
493 dev_info(&bridge->dev, " bridge window %pR\n", res);
494 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
496 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
500 res = bus->resource[2];
501 pcibios_resource_to_bus(bridge->bus, ®ion, res);
502 if (res->flags & IORESOURCE_MEM) {
503 dev_info(&bridge->dev, " bridge window %pR\n", res);
504 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
506 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
510 res = bus->resource[3];
511 pcibios_resource_to_bus(bridge->bus, ®ion, res);
512 if (res->flags & IORESOURCE_MEM) {
513 dev_info(&bridge->dev, " bridge window %pR\n", res);
514 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
516 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
520 EXPORT_SYMBOL(pci_setup_cardbus);
522 /* Initialize bridges with base/limit values we have collected.
523 PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
524 requires that if there is no I/O ports or memory behind the
525 bridge, corresponding range must be turned off by writing base
526 value greater than limit to the bridge's base/limit registers.
528 Note: care must be taken when updating I/O base/limit registers
529 of bridges which support 32-bit I/O. This update requires two
530 config space writes, so it's quite possible that an I/O window of
531 the bridge will have some undesirable address (e.g. 0) after the
532 first write. Ditto 64-bit prefetchable MMIO. */
533 static void pci_setup_bridge_io(struct pci_bus *bus)
535 struct pci_dev *bridge = bus->self;
536 struct resource *res;
537 struct pci_bus_region region;
538 unsigned long io_mask;
539 u8 io_base_lo, io_limit_lo;
543 io_mask = PCI_IO_RANGE_MASK;
544 if (bridge->io_window_1k)
545 io_mask = PCI_IO_1K_RANGE_MASK;
547 /* Set up the top and bottom of the PCI I/O segment for this bus. */
548 res = bus->resource[0];
549 pcibios_resource_to_bus(bridge->bus, ®ion, res);
550 if (res->flags & IORESOURCE_IO) {
551 pci_read_config_word(bridge, PCI_IO_BASE, &l);
552 io_base_lo = (region.start >> 8) & io_mask;
553 io_limit_lo = (region.end >> 8) & io_mask;
554 l = ((u16) io_limit_lo << 8) | io_base_lo;
555 /* Set up upper 16 bits of I/O base/limit. */
556 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
557 dev_info(&bridge->dev, " bridge window %pR\n", res);
559 /* Clear upper 16 bits of I/O base/limit. */
563 /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
564 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
565 /* Update lower 16 bits of I/O base/limit. */
566 pci_write_config_word(bridge, PCI_IO_BASE, l);
567 /* Update upper 16 bits of I/O base/limit. */
568 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
571 static void pci_setup_bridge_mmio(struct pci_bus *bus)
573 struct pci_dev *bridge = bus->self;
574 struct resource *res;
575 struct pci_bus_region region;
578 /* Set up the top and bottom of the PCI Memory segment for this bus. */
579 res = bus->resource[1];
580 pcibios_resource_to_bus(bridge->bus, ®ion, res);
581 if (res->flags & IORESOURCE_MEM) {
582 l = (region.start >> 16) & 0xfff0;
583 l |= region.end & 0xfff00000;
584 dev_info(&bridge->dev, " bridge window %pR\n", res);
588 pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
591 static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)
593 struct pci_dev *bridge = bus->self;
594 struct resource *res;
595 struct pci_bus_region region;
598 /* Clear out the upper 32 bits of PREF limit.
599 If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
600 disables PREF range, which is ok. */
601 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
603 /* Set up PREF base/limit. */
605 res = bus->resource[2];
606 pcibios_resource_to_bus(bridge->bus, ®ion, res);
607 if (res->flags & IORESOURCE_PREFETCH) {
608 l = (region.start >> 16) & 0xfff0;
609 l |= region.end & 0xfff00000;
610 if (res->flags & IORESOURCE_MEM_64) {
611 bu = upper_32_bits(region.start);
612 lu = upper_32_bits(region.end);
614 dev_info(&bridge->dev, " bridge window %pR\n", res);
618 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
620 /* Set the upper 32 bits of PREF base & limit. */
621 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
622 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
625 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
627 struct pci_dev *bridge = bus->self;
629 dev_info(&bridge->dev, "PCI bridge to %pR\n",
632 if (type & IORESOURCE_IO)
633 pci_setup_bridge_io(bus);
635 if (type & IORESOURCE_MEM)
636 pci_setup_bridge_mmio(bus);
638 if (type & IORESOURCE_PREFETCH)
639 pci_setup_bridge_mmio_pref(bus);
641 pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
644 void pci_setup_bridge(struct pci_bus *bus)
646 unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
649 __pci_setup_bridge(bus, type);
652 /* Check whether the bridge supports optional I/O and
653 prefetchable memory ranges. If not, the respective
654 base/limit registers must be read-only and read as 0. */
655 static void pci_bridge_check_ranges(struct pci_bus *bus)
659 struct pci_dev *bridge = bus->self;
660 struct resource *b_res;
662 b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
663 b_res[1].flags |= IORESOURCE_MEM;
665 pci_read_config_word(bridge, PCI_IO_BASE, &io);
667 pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0);
668 pci_read_config_word(bridge, PCI_IO_BASE, &io);
669 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
672 b_res[0].flags |= IORESOURCE_IO;
674 /* DECchip 21050 pass 2 errata: the bridge may miss an address
675 disconnect boundary by one PCI data phase.
676 Workaround: do not use prefetching on this device. */
677 if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
680 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
682 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
684 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
685 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
688 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
689 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
690 PCI_PREF_RANGE_TYPE_64) {
691 b_res[2].flags |= IORESOURCE_MEM_64;
692 b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
696 /* double check if bridge does support 64 bit pref */
697 if (b_res[2].flags & IORESOURCE_MEM_64) {
698 u32 mem_base_hi, tmp;
699 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
701 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
703 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
705 b_res[2].flags &= ~IORESOURCE_MEM_64;
706 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
711 /* Helper function for sizing routines: find first available
712 bus resource of a given type. Note: we intentionally skip
713 the bus resources which have already been assigned (that is,
714 have non-NULL parent resource). */
715 static struct resource *find_free_bus_resource(struct pci_bus *bus,
716 unsigned long type_mask, unsigned long type)
721 pci_bus_for_each_resource(bus, r, i) {
722 if (r == &ioport_resource || r == &iomem_resource)
724 if (r && (r->flags & type_mask) == type && !r->parent)
730 static resource_size_t calculate_iosize(resource_size_t size,
731 resource_size_t min_size,
732 resource_size_t size1,
733 resource_size_t old_size,
734 resource_size_t align)
740 /* To be fixed in 2.5: we should have sort of HAVE_ISA
741 flag in the struct pci_bus. */
742 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
743 size = (size & 0xff) + ((size & ~0xffUL) << 2);
745 size = ALIGN(size + size1, align);
751 static resource_size_t calculate_memsize(resource_size_t size,
752 resource_size_t min_size,
753 resource_size_t size1,
754 resource_size_t old_size,
755 resource_size_t align)
763 size = ALIGN(size + size1, align);
767 resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
773 #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */
774 #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */
775 #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */
777 static resource_size_t window_alignment(struct pci_bus *bus,
780 resource_size_t align = 1, arch_align;
782 if (type & IORESOURCE_MEM)
783 align = PCI_P2P_DEFAULT_MEM_ALIGN;
784 else if (type & IORESOURCE_IO) {
786 * Per spec, I/O windows are 4K-aligned, but some
787 * bridges have an extension to support 1K alignment.
789 if (bus->self->io_window_1k)
790 align = PCI_P2P_DEFAULT_IO_ALIGN_1K;
792 align = PCI_P2P_DEFAULT_IO_ALIGN;
795 arch_align = pcibios_window_alignment(bus, type);
796 return max(align, arch_align);
800 * pbus_size_io() - size the io window of a given bus
803 * @min_size : the minimum io window that must to be allocated
804 * @add_size : additional optional io window
805 * @realloc_head : track the additional io window on this list
807 * Sizing the IO windows of the PCI-PCI bridge is trivial,
808 * since these windows have 1K or 4K granularity and the IO ranges
809 * of non-bridge PCI devices are limited to 256 bytes.
810 * We must be careful with the ISA aliasing though.
812 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
813 resource_size_t add_size, struct list_head *realloc_head)
816 struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO,
818 resource_size_t size = 0, size0 = 0, size1 = 0;
819 resource_size_t children_add_size = 0;
820 resource_size_t min_align, align;
825 min_align = window_alignment(bus, IORESOURCE_IO);
826 list_for_each_entry(dev, &bus->devices, bus_list) {
829 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
830 struct resource *r = &dev->resource[i];
831 unsigned long r_size;
833 if (r->parent || !(r->flags & IORESOURCE_IO))
835 r_size = resource_size(r);
838 /* Might be re-aligned for ISA */
843 align = pci_resource_alignment(dev, r);
844 if (align > min_align)
848 children_add_size += get_res_add_size(realloc_head, r);
852 size0 = calculate_iosize(size, min_size, size1,
853 resource_size(b_res), min_align);
854 if (children_add_size > add_size)
855 add_size = children_add_size;
856 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
857 calculate_iosize(size, min_size, add_size + size1,
858 resource_size(b_res), min_align);
859 if (!size0 && !size1) {
860 if (b_res->start || b_res->end)
861 dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
862 b_res, &bus->busn_res);
867 b_res->start = min_align;
868 b_res->end = b_res->start + size0 - 1;
869 b_res->flags |= IORESOURCE_STARTALIGN;
870 if (size1 > size0 && realloc_head) {
871 add_to_list(realloc_head, bus->self, b_res, size1-size0,
873 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx\n",
874 b_res, &bus->busn_res,
875 (unsigned long long)size1-size0);
879 static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
882 resource_size_t align = 0;
883 resource_size_t min_align = 0;
886 for (order = 0; order <= max_order; order++) {
887 resource_size_t align1 = 1;
889 align1 <<= (order + 20);
893 else if (ALIGN(align + min_align, min_align) < align1)
894 min_align = align1 >> 1;
895 align += aligns[order];
902 * pbus_size_mem() - size the memory window of a given bus
905 * @mask: mask the resource flag, then compare it with type
906 * @type: the type of free resource from bridge
907 * @type2: second match type
908 * @type3: third match type
909 * @min_size : the minimum memory window that must to be allocated
910 * @add_size : additional optional memory window
911 * @realloc_head : track the additional memory window on this list
913 * Calculate the size of the bus and minimal alignment which
914 * guarantees that all child resources fit in this size.
916 * Returns -ENOSPC if there's no available bus resource of the desired type.
917 * Otherwise, sets the bus resource start/end to indicate the required
918 * size, adds things to realloc_head (if supplied), and returns 0.
920 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
921 unsigned long type, unsigned long type2,
923 resource_size_t min_size, resource_size_t add_size,
924 struct list_head *realloc_head)
927 resource_size_t min_align, align, size, size0, size1;
928 resource_size_t aligns[18]; /* Alignments from 1Mb to 128Gb */
929 int order, max_order;
930 struct resource *b_res = find_free_bus_resource(bus,
931 mask | IORESOURCE_PREFETCH, type);
932 resource_size_t children_add_size = 0;
937 memset(aligns, 0, sizeof(aligns));
941 list_for_each_entry(dev, &bus->devices, bus_list) {
944 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
945 struct resource *r = &dev->resource[i];
946 resource_size_t r_size;
948 if (r->parent || ((r->flags & mask) != type &&
949 (r->flags & mask) != type2 &&
950 (r->flags & mask) != type3))
952 r_size = resource_size(r);
953 #ifdef CONFIG_PCI_IOV
954 /* put SRIOV requested res to the optional list */
955 if (realloc_head && i >= PCI_IOV_RESOURCES &&
956 i <= PCI_IOV_RESOURCE_END) {
957 r->end = r->start - 1;
958 add_to_list(realloc_head, dev, r, r_size, 0/* don't care */);
959 children_add_size += r_size;
964 * aligns[0] is for 1MB (since bridge memory
965 * windows are always at least 1MB aligned), so
966 * keep "order" from being negative for smaller
969 align = pci_resource_alignment(dev, r);
970 order = __ffs(align) - 20;
973 if (order >= ARRAY_SIZE(aligns)) {
974 dev_warn(&dev->dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
975 i, r, (unsigned long long) align);
980 /* Exclude ranges with size > align from
981 calculation of the alignment. */
983 aligns[order] += align;
984 if (order > max_order)
988 children_add_size += get_res_add_size(realloc_head, r);
992 min_align = calculate_mem_align(aligns, max_order);
993 min_align = max(min_align, window_alignment(bus, b_res->flags));
994 size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
995 if (children_add_size > add_size)
996 add_size = children_add_size;
997 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
998 calculate_memsize(size, min_size, add_size,
999 resource_size(b_res), min_align);
1000 if (!size0 && !size1) {
1001 if (b_res->start || b_res->end)
1002 dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
1003 b_res, &bus->busn_res);
1007 b_res->start = min_align;
1008 b_res->end = size0 + min_align - 1;
1009 b_res->flags |= IORESOURCE_STARTALIGN;
1010 if (size1 > size0 && realloc_head) {
1011 add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align);
1012 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx\n",
1013 b_res, &bus->busn_res,
1014 (unsigned long long)size1-size0);
1019 unsigned long pci_cardbus_resource_alignment(struct resource *res)
1021 if (res->flags & IORESOURCE_IO)
1022 return pci_cardbus_io_size;
1023 if (res->flags & IORESOURCE_MEM)
1024 return pci_cardbus_mem_size;
1028 static void pci_bus_size_cardbus(struct pci_bus *bus,
1029 struct list_head *realloc_head)
1031 struct pci_dev *bridge = bus->self;
1032 struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
1033 resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
1036 if (b_res[0].parent)
1037 goto handle_b_res_1;
1039 * Reserve some resources for CardBus. We reserve
1040 * a fixed amount of bus space for CardBus bridges.
1042 b_res[0].start = pci_cardbus_io_size;
1043 b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
1044 b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1046 b_res[0].end -= pci_cardbus_io_size;
1047 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
1048 pci_cardbus_io_size);
1052 if (b_res[1].parent)
1053 goto handle_b_res_2;
1054 b_res[1].start = pci_cardbus_io_size;
1055 b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
1056 b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1058 b_res[1].end -= pci_cardbus_io_size;
1059 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size,
1060 pci_cardbus_io_size);
1064 /* MEM1 must not be pref mmio */
1065 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1066 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
1067 ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
1068 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1069 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1073 * Check whether prefetchable memory is supported
1076 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1077 if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
1078 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
1079 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1080 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1083 if (b_res[2].parent)
1084 goto handle_b_res_3;
1086 * If we have prefetchable memory support, allocate
1087 * two regions. Otherwise, allocate one region of
1090 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
1091 b_res[2].start = pci_cardbus_mem_size;
1092 b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
1093 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
1094 IORESOURCE_STARTALIGN;
1096 b_res[2].end -= pci_cardbus_mem_size;
1097 add_to_list(realloc_head, bridge, b_res+2,
1098 pci_cardbus_mem_size, pci_cardbus_mem_size);
1101 /* reduce that to half */
1102 b_res_3_size = pci_cardbus_mem_size;
1106 if (b_res[3].parent)
1108 b_res[3].start = pci_cardbus_mem_size;
1109 b_res[3].end = b_res[3].start + b_res_3_size - 1;
1110 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
1112 b_res[3].end -= b_res_3_size;
1113 add_to_list(realloc_head, bridge, b_res+3, b_res_3_size,
1114 pci_cardbus_mem_size);
1121 void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
1123 struct pci_dev *dev;
1124 unsigned long mask, prefmask, type2 = 0, type3 = 0;
1125 resource_size_t additional_mem_size = 0, additional_io_size = 0;
1126 struct resource *b_res;
1129 list_for_each_entry(dev, &bus->devices, bus_list) {
1130 struct pci_bus *b = dev->subordinate;
1134 switch (dev->class >> 8) {
1135 case PCI_CLASS_BRIDGE_CARDBUS:
1136 pci_bus_size_cardbus(b, realloc_head);
1139 case PCI_CLASS_BRIDGE_PCI:
1141 __pci_bus_size_bridges(b, realloc_head);
1147 if (pci_is_root_bus(bus))
1150 switch (bus->self->class >> 8) {
1151 case PCI_CLASS_BRIDGE_CARDBUS:
1152 /* don't size cardbuses yet. */
1155 case PCI_CLASS_BRIDGE_PCI:
1156 pci_bridge_check_ranges(bus);
1157 if (bus->self->is_hotplug_bridge) {
1158 additional_io_size = pci_hotplug_io_size;
1159 additional_mem_size = pci_hotplug_mem_size;
1163 pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
1164 additional_io_size, realloc_head);
1167 * If there's a 64-bit prefetchable MMIO window, compute
1168 * the size required to put all 64-bit prefetchable
1171 b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES];
1172 mask = IORESOURCE_MEM;
1173 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
1174 if (b_res[2].flags & IORESOURCE_MEM_64) {
1175 prefmask |= IORESOURCE_MEM_64;
1176 ret = pbus_size_mem(bus, prefmask, prefmask,
1178 realloc_head ? 0 : additional_mem_size,
1179 additional_mem_size, realloc_head);
1182 * If successful, all non-prefetchable resources
1183 * and any 32-bit prefetchable resources will go in
1184 * the non-prefetchable window.
1188 type2 = prefmask & ~IORESOURCE_MEM_64;
1189 type3 = prefmask & ~IORESOURCE_PREFETCH;
1194 * If there is no 64-bit prefetchable window, compute the
1195 * size required to put all prefetchable resources in the
1196 * 32-bit prefetchable window (if there is one).
1199 prefmask &= ~IORESOURCE_MEM_64;
1200 ret = pbus_size_mem(bus, prefmask, prefmask,
1202 realloc_head ? 0 : additional_mem_size,
1203 additional_mem_size, realloc_head);
1206 * If successful, only non-prefetchable resources
1207 * will go in the non-prefetchable window.
1212 additional_mem_size += additional_mem_size;
1214 type2 = type3 = IORESOURCE_MEM;
1218 * Compute the size required to put everything else in the
1219 * non-prefetchable window. This includes:
1221 * - all non-prefetchable resources
1222 * - 32-bit prefetchable resources if there's a 64-bit
1223 * prefetchable window or no prefetchable window at all
1224 * - 64-bit prefetchable resources if there's no
1225 * prefetchable window at all
1227 * Note that the strategy in __pci_assign_resource() must
1228 * match that used here. Specifically, we cannot put a
1229 * 32-bit prefetchable resource in a 64-bit prefetchable
1232 pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
1233 realloc_head ? 0 : additional_mem_size,
1234 additional_mem_size, realloc_head);
1239 void pci_bus_size_bridges(struct pci_bus *bus)
1241 __pci_bus_size_bridges(bus, NULL);
1243 EXPORT_SYMBOL(pci_bus_size_bridges);
1245 void __pci_bus_assign_resources(const struct pci_bus *bus,
1246 struct list_head *realloc_head,
1247 struct list_head *fail_head)
1250 struct pci_dev *dev;
1252 pbus_assign_resources_sorted(bus, realloc_head, fail_head);
1254 list_for_each_entry(dev, &bus->devices, bus_list) {
1255 b = dev->subordinate;
1259 __pci_bus_assign_resources(b, realloc_head, fail_head);
1261 switch (dev->class >> 8) {
1262 case PCI_CLASS_BRIDGE_PCI:
1263 if (!pci_is_enabled(dev))
1264 pci_setup_bridge(b);
1267 case PCI_CLASS_BRIDGE_CARDBUS:
1268 pci_setup_cardbus(b);
1272 dev_info(&dev->dev, "not setting up bridge for bus %04x:%02x\n",
1273 pci_domain_nr(b), b->number);
1279 void pci_bus_assign_resources(const struct pci_bus *bus)
1281 __pci_bus_assign_resources(bus, NULL, NULL);
1283 EXPORT_SYMBOL(pci_bus_assign_resources);
1285 static void __pci_bridge_assign_resources(const struct pci_dev *bridge,
1286 struct list_head *add_head,
1287 struct list_head *fail_head)
1291 pdev_assign_resources_sorted((struct pci_dev *)bridge,
1292 add_head, fail_head);
1294 b = bridge->subordinate;
1298 __pci_bus_assign_resources(b, add_head, fail_head);
1300 switch (bridge->class >> 8) {
1301 case PCI_CLASS_BRIDGE_PCI:
1302 pci_setup_bridge(b);
1305 case PCI_CLASS_BRIDGE_CARDBUS:
1306 pci_setup_cardbus(b);
1310 dev_info(&bridge->dev, "not setting up bridge for bus %04x:%02x\n",
1311 pci_domain_nr(b), b->number);
1315 static void pci_bridge_release_resources(struct pci_bus *bus,
1318 struct pci_dev *dev = bus->self;
1320 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1321 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1322 unsigned old_flags = 0;
1323 struct resource *b_res;
1326 b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
1329 * 1. if there is io port assign fail, will release bridge
1331 * 2. if there is non pref mmio assign fail, release bridge
1333 * 3. if there is 64bit pref mmio assign fail, and bridge pref
1334 * is 64bit, release bridge pref mmio.
1335 * 4. if there is pref mmio assign fail, and bridge pref is
1336 * 32bit mmio, release bridge pref mmio
1337 * 5. if there is pref mmio assign fail, and bridge pref is not
1338 * assigned, release bridge nonpref mmio.
1340 if (type & IORESOURCE_IO)
1342 else if (!(type & IORESOURCE_PREFETCH))
1344 else if ((type & IORESOURCE_MEM_64) &&
1345 (b_res[2].flags & IORESOURCE_MEM_64))
1347 else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
1348 (b_res[2].flags & IORESOURCE_PREFETCH))
1359 * if there are children under that, we should release them
1362 release_child_resources(r);
1363 if (!release_resource(r)) {
1364 type = old_flags = r->flags & type_mask;
1365 dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n",
1366 PCI_BRIDGE_RESOURCES + idx, r);
1367 /* keep the old size */
1368 r->end = resource_size(r) - 1;
1372 /* avoiding touch the one without PREF */
1373 if (type & IORESOURCE_PREFETCH)
1374 type = IORESOURCE_PREFETCH;
1375 __pci_setup_bridge(bus, type);
1376 /* for next child res under same bridge */
1377 r->flags = old_flags;
1386 * try to release pci bridge resources that is from leaf bridge,
1387 * so we can allocate big new one later
1389 static void pci_bus_release_bridge_resources(struct pci_bus *bus,
1391 enum release_type rel_type)
1393 struct pci_dev *dev;
1394 bool is_leaf_bridge = true;
1396 list_for_each_entry(dev, &bus->devices, bus_list) {
1397 struct pci_bus *b = dev->subordinate;
1401 is_leaf_bridge = false;
1403 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1406 if (rel_type == whole_subtree)
1407 pci_bus_release_bridge_resources(b, type,
1411 if (pci_is_root_bus(bus))
1414 if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1417 if ((rel_type == whole_subtree) || is_leaf_bridge)
1418 pci_bridge_release_resources(bus, type);
1421 static void pci_bus_dump_res(struct pci_bus *bus)
1423 struct resource *res;
1426 pci_bus_for_each_resource(bus, res, i) {
1427 if (!res || !res->end || !res->flags)
1430 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
1434 static void pci_bus_dump_resources(struct pci_bus *bus)
1437 struct pci_dev *dev;
1440 pci_bus_dump_res(bus);
1442 list_for_each_entry(dev, &bus->devices, bus_list) {
1443 b = dev->subordinate;
1447 pci_bus_dump_resources(b);
1451 static int pci_bus_get_depth(struct pci_bus *bus)
1454 struct pci_bus *child_bus;
1456 list_for_each_entry(child_bus, &bus->children, node) {
1459 ret = pci_bus_get_depth(child_bus);
1460 if (ret + 1 > depth)
1468 * -1: undefined, will auto detect later
1469 * 0: disabled by user
1470 * 1: disabled by auto detect
1471 * 2: enabled by user
1472 * 3: enabled by auto detect
1482 static enum enable_type pci_realloc_enable = undefined;
1483 void __init pci_realloc_get_opt(char *str)
1485 if (!strncmp(str, "off", 3))
1486 pci_realloc_enable = user_disabled;
1487 else if (!strncmp(str, "on", 2))
1488 pci_realloc_enable = user_enabled;
1490 static bool pci_realloc_enabled(enum enable_type enable)
1492 return enable >= user_enabled;
1495 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
1496 static int iov_resources_unassigned(struct pci_dev *dev, void *data)
1499 bool *unassigned = data;
1501 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
1502 struct resource *r = &dev->resource[i];
1503 struct pci_bus_region region;
1505 /* Not assigned or rejected by kernel? */
1509 pcibios_resource_to_bus(dev->bus, ®ion, r);
1510 if (!region.start) {
1512 return 1; /* return early from pci_walk_bus() */
1519 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1520 enum enable_type enable_local)
1522 bool unassigned = false;
1524 if (enable_local != undefined)
1525 return enable_local;
1527 pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
1529 return auto_enabled;
1531 return enable_local;
1534 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1535 enum enable_type enable_local)
1537 return enable_local;
1542 * first try will not touch pci bridge res
1543 * second and later try will clear small leaf bridge res
1544 * will stop till to the max depth if can not find good one
1546 void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
1548 LIST_HEAD(realloc_head); /* list of resources that
1549 want additional resources */
1550 struct list_head *add_list = NULL;
1551 int tried_times = 0;
1552 enum release_type rel_type = leaf_only;
1553 LIST_HEAD(fail_head);
1554 struct pci_dev_resource *fail_res;
1555 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1556 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1557 int pci_try_num = 1;
1558 enum enable_type enable_local;
1560 /* don't realloc if asked to do so */
1561 enable_local = pci_realloc_detect(bus, pci_realloc_enable);
1562 if (pci_realloc_enabled(enable_local)) {
1563 int max_depth = pci_bus_get_depth(bus);
1565 pci_try_num = max_depth + 1;
1566 dev_printk(KERN_DEBUG, &bus->dev,
1567 "max bus depth: %d pci_try_num: %d\n",
1568 max_depth, pci_try_num);
1573 * last try will use add_list, otherwise will try good to have as
1574 * must have, so can realloc parent bridge resource
1576 if (tried_times + 1 == pci_try_num)
1577 add_list = &realloc_head;
1578 /* Depth first, calculate sizes and alignments of all
1579 subordinate buses. */
1580 __pci_bus_size_bridges(bus, add_list);
1582 /* Depth last, allocate resources and update the hardware. */
1583 __pci_bus_assign_resources(bus, add_list, &fail_head);
1585 BUG_ON(!list_empty(add_list));
1588 /* any device complain? */
1589 if (list_empty(&fail_head))
1592 if (tried_times >= pci_try_num) {
1593 if (enable_local == undefined)
1594 dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n");
1595 else if (enable_local == auto_enabled)
1596 dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
1598 free_list(&fail_head);
1602 dev_printk(KERN_DEBUG, &bus->dev,
1603 "No. %d try to assign unassigned res\n", tried_times + 1);
1605 /* third times and later will not check if it is leaf */
1606 if ((tried_times + 1) > 2)
1607 rel_type = whole_subtree;
1610 * Try to release leaf bridge's resources that doesn't fit resource of
1611 * child device under that bridge
1613 list_for_each_entry(fail_res, &fail_head, list)
1614 pci_bus_release_bridge_resources(fail_res->dev->bus,
1615 fail_res->flags & type_mask,
1618 /* restore size and flags */
1619 list_for_each_entry(fail_res, &fail_head, list) {
1620 struct resource *res = fail_res->res;
1622 res->start = fail_res->start;
1623 res->end = fail_res->end;
1624 res->flags = fail_res->flags;
1625 if (fail_res->dev->subordinate)
1628 free_list(&fail_head);
1633 /* dump the resource on buses */
1634 pci_bus_dump_resources(bus);
1637 void __init pci_assign_unassigned_resources(void)
1639 struct pci_bus *root_bus;
1641 list_for_each_entry(root_bus, &pci_root_buses, node)
1642 pci_assign_unassigned_root_bus_resources(root_bus);
1645 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1647 struct pci_bus *parent = bridge->subordinate;
1648 LIST_HEAD(add_list); /* list of resources that
1649 want additional resources */
1650 int tried_times = 0;
1651 LIST_HEAD(fail_head);
1652 struct pci_dev_resource *fail_res;
1654 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1655 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1658 __pci_bus_size_bridges(parent, &add_list);
1659 __pci_bridge_assign_resources(bridge, &add_list, &fail_head);
1660 BUG_ON(!list_empty(&add_list));
1663 if (list_empty(&fail_head))
1666 if (tried_times >= 2) {
1667 /* still fail, don't need to try more */
1668 free_list(&fail_head);
1672 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1676 * Try to release leaf bridge's resources that doesn't fit resource of
1677 * child device under that bridge
1679 list_for_each_entry(fail_res, &fail_head, list)
1680 pci_bus_release_bridge_resources(fail_res->dev->bus,
1681 fail_res->flags & type_mask,
1684 /* restore size and flags */
1685 list_for_each_entry(fail_res, &fail_head, list) {
1686 struct resource *res = fail_res->res;
1688 res->start = fail_res->start;
1689 res->end = fail_res->end;
1690 res->flags = fail_res->flags;
1691 if (fail_res->dev->subordinate)
1694 free_list(&fail_head);
1699 retval = pci_reenable_device(bridge);
1701 dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
1702 pci_set_master(bridge);
1704 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
1706 void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
1708 struct pci_dev *dev;
1709 LIST_HEAD(add_list); /* list of resources that
1710 want additional resources */
1712 down_read(&pci_bus_sem);
1713 list_for_each_entry(dev, &bus->devices, bus_list)
1714 if (pci_is_bridge(dev) && pci_has_subordinate(dev))
1715 __pci_bus_size_bridges(dev->subordinate,
1717 up_read(&pci_bus_sem);
1718 __pci_bus_assign_resources(bus, &add_list, NULL);
1719 BUG_ON(!list_empty(&add_list));