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_warning("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(): "
152 "kmalloc() failed!\n");
156 /* fallback is smallest one or list is empty*/
158 list_for_each_entry(dev_res, head, list) {
159 resource_size_t align;
161 align = pci_resource_alignment(dev_res->dev,
164 if (r_align > align) {
169 /* Insert it just before n*/
170 list_add_tail(&tmp->list, n);
174 static void __dev_sort_resources(struct pci_dev *dev,
175 struct list_head *head)
177 u16 class = dev->class >> 8;
179 /* Don't touch classless devices or host bridges or ioapics. */
180 if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
183 /* Don't touch ioapic devices already enabled by firmware */
184 if (class == PCI_CLASS_SYSTEM_PIC) {
186 pci_read_config_word(dev, PCI_COMMAND, &command);
187 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
191 pdev_sort_resources(dev, head);
194 static inline void reset_resource(struct resource *res)
202 * reassign_resources_sorted() - satisfy any additional resource requests
204 * @realloc_head : head of the list tracking requests requiring additional
206 * @head : head of the list tracking requests with allocated
209 * Walk through each element of the realloc_head and try to procure
210 * additional resources for the element, provided the element
211 * is in the head list.
213 static void reassign_resources_sorted(struct list_head *realloc_head,
214 struct list_head *head)
216 struct resource *res;
217 struct pci_dev_resource *add_res, *tmp;
218 struct pci_dev_resource *dev_res;
219 resource_size_t add_size;
222 list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
223 bool found_match = false;
226 /* skip resource that has been reset */
230 /* skip this resource if not found in head list */
231 list_for_each_entry(dev_res, head, list) {
232 if (dev_res->res == res) {
237 if (!found_match)/* just skip */
240 idx = res - &add_res->dev->resource[0];
241 add_size = add_res->add_size;
242 if (!resource_size(res)) {
243 res->start = add_res->start;
244 res->end = res->start + add_size - 1;
245 if (pci_assign_resource(add_res->dev, idx))
248 resource_size_t align = add_res->min_align;
249 res->flags |= add_res->flags &
250 (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
251 if (pci_reassign_resource(add_res->dev, idx,
253 dev_printk(KERN_DEBUG, &add_res->dev->dev,
254 "failed to add %llx res[%d]=%pR\n",
255 (unsigned long long)add_size,
259 list_del(&add_res->list);
265 * assign_requested_resources_sorted() - satisfy resource requests
267 * @head : head of the list tracking requests for resources
268 * @fail_head : head of the list tracking requests that could
271 * Satisfy resource requests of each element in the list. Add
272 * requests that could not satisfied to the failed_list.
274 static void assign_requested_resources_sorted(struct list_head *head,
275 struct list_head *fail_head)
277 struct resource *res;
278 struct pci_dev_resource *dev_res;
281 list_for_each_entry(dev_res, head, list) {
283 idx = res - &dev_res->dev->resource[0];
284 if (resource_size(res) &&
285 pci_assign_resource(dev_res->dev, idx)) {
288 * if the failed res is for ROM BAR, and it will
289 * be enabled later, don't add it to the list
291 if (!((idx == PCI_ROM_RESOURCE) &&
292 (!(res->flags & IORESOURCE_ROM_ENABLE))))
293 add_to_list(fail_head,
303 static void __assign_resources_sorted(struct list_head *head,
304 struct list_head *realloc_head,
305 struct list_head *fail_head)
308 * Should not assign requested resources at first.
309 * they could be adjacent, so later reassign can not reallocate
310 * them one by one in parent resource window.
311 * Try to assign requested + add_size at beginning
312 * if could do that, could get out early.
313 * if could not do that, we still try to assign requested at first,
314 * then try to reassign add_size for some resources.
316 LIST_HEAD(save_head);
317 LIST_HEAD(local_fail_head);
318 struct pci_dev_resource *save_res;
319 struct pci_dev_resource *dev_res;
321 /* Check if optional add_size is there */
322 if (!realloc_head || list_empty(realloc_head))
323 goto requested_and_reassign;
325 /* Save original start, end, flags etc at first */
326 list_for_each_entry(dev_res, head, list) {
327 if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
328 free_list(&save_head);
329 goto requested_and_reassign;
333 /* Update res in head list with add_size in realloc_head list */
334 list_for_each_entry(dev_res, head, list)
335 dev_res->res->end += get_res_add_size(realloc_head,
338 /* Try updated head list with add_size added */
339 assign_requested_resources_sorted(head, &local_fail_head);
341 /* all assigned with add_size ? */
342 if (list_empty(&local_fail_head)) {
343 /* Remove head list from realloc_head list */
344 list_for_each_entry(dev_res, head, list)
345 remove_from_list(realloc_head, dev_res->res);
346 free_list(&save_head);
351 free_list(&local_fail_head);
352 /* Release assigned resource */
353 list_for_each_entry(dev_res, head, list)
354 if (dev_res->res->parent)
355 release_resource(dev_res->res);
356 /* Restore start/end/flags from saved list */
357 list_for_each_entry(save_res, &save_head, list) {
358 struct resource *res = save_res->res;
360 res->start = save_res->start;
361 res->end = save_res->end;
362 res->flags = save_res->flags;
364 free_list(&save_head);
366 requested_and_reassign:
367 /* Satisfy the must-have resource requests */
368 assign_requested_resources_sorted(head, fail_head);
370 /* Try to satisfy any additional optional resource
373 reassign_resources_sorted(realloc_head, head);
377 static void pdev_assign_resources_sorted(struct pci_dev *dev,
378 struct list_head *add_head,
379 struct list_head *fail_head)
383 __dev_sort_resources(dev, &head);
384 __assign_resources_sorted(&head, add_head, fail_head);
388 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
389 struct list_head *realloc_head,
390 struct list_head *fail_head)
395 list_for_each_entry(dev, &bus->devices, bus_list)
396 __dev_sort_resources(dev, &head);
398 __assign_resources_sorted(&head, realloc_head, fail_head);
401 void pci_setup_cardbus(struct pci_bus *bus)
403 struct pci_dev *bridge = bus->self;
404 struct resource *res;
405 struct pci_bus_region region;
407 dev_info(&bridge->dev, "CardBus bridge to %pR\n",
410 res = bus->resource[0];
411 pcibios_resource_to_bus(bridge, ®ion, res);
412 if (res->flags & IORESOURCE_IO) {
414 * The IO resource is allocated a range twice as large as it
415 * would normally need. This allows us to set both IO regs.
417 dev_info(&bridge->dev, " bridge window %pR\n", res);
418 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
420 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
424 res = bus->resource[1];
425 pcibios_resource_to_bus(bridge, ®ion, res);
426 if (res->flags & IORESOURCE_IO) {
427 dev_info(&bridge->dev, " bridge window %pR\n", res);
428 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
430 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
434 res = bus->resource[2];
435 pcibios_resource_to_bus(bridge, ®ion, res);
436 if (res->flags & IORESOURCE_MEM) {
437 dev_info(&bridge->dev, " bridge window %pR\n", res);
438 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
440 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
444 res = bus->resource[3];
445 pcibios_resource_to_bus(bridge, ®ion, res);
446 if (res->flags & IORESOURCE_MEM) {
447 dev_info(&bridge->dev, " bridge window %pR\n", res);
448 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
450 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
454 EXPORT_SYMBOL(pci_setup_cardbus);
456 /* Initialize bridges with base/limit values we have collected.
457 PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
458 requires that if there is no I/O ports or memory behind the
459 bridge, corresponding range must be turned off by writing base
460 value greater than limit to the bridge's base/limit registers.
462 Note: care must be taken when updating I/O base/limit registers
463 of bridges which support 32-bit I/O. This update requires two
464 config space writes, so it's quite possible that an I/O window of
465 the bridge will have some undesirable address (e.g. 0) after the
466 first write. Ditto 64-bit prefetchable MMIO. */
467 static void pci_setup_bridge_io(struct pci_bus *bus)
469 struct pci_dev *bridge = bus->self;
470 struct resource *res;
471 struct pci_bus_region region;
472 unsigned long io_mask;
473 u8 io_base_lo, io_limit_lo;
476 io_mask = PCI_IO_RANGE_MASK;
477 if (bridge->io_window_1k)
478 io_mask = PCI_IO_1K_RANGE_MASK;
480 /* Set up the top and bottom of the PCI I/O segment for this bus. */
481 res = bus->resource[0];
482 pcibios_resource_to_bus(bridge, ®ion, res);
483 if (res->flags & IORESOURCE_IO) {
484 pci_read_config_dword(bridge, PCI_IO_BASE, &l);
486 io_base_lo = (region.start >> 8) & io_mask;
487 io_limit_lo = (region.end >> 8) & io_mask;
488 l |= ((u32) io_limit_lo << 8) | io_base_lo;
489 /* Set up upper 16 bits of I/O base/limit. */
490 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
491 dev_info(&bridge->dev, " bridge window %pR\n", res);
493 /* Clear upper 16 bits of I/O base/limit. */
497 /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
498 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
499 /* Update lower 16 bits of I/O base/limit. */
500 pci_write_config_dword(bridge, PCI_IO_BASE, l);
501 /* Update upper 16 bits of I/O base/limit. */
502 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
505 static void pci_setup_bridge_mmio(struct pci_bus *bus)
507 struct pci_dev *bridge = bus->self;
508 struct resource *res;
509 struct pci_bus_region region;
512 /* Set up the top and bottom of the PCI Memory segment for this bus. */
513 res = bus->resource[1];
514 pcibios_resource_to_bus(bridge, ®ion, res);
515 if (res->flags & IORESOURCE_MEM) {
516 l = (region.start >> 16) & 0xfff0;
517 l |= region.end & 0xfff00000;
518 dev_info(&bridge->dev, " bridge window %pR\n", res);
522 pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
525 static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)
527 struct pci_dev *bridge = bus->self;
528 struct resource *res;
529 struct pci_bus_region region;
532 /* Clear out the upper 32 bits of PREF limit.
533 If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
534 disables PREF range, which is ok. */
535 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
537 /* Set up PREF base/limit. */
539 res = bus->resource[2];
540 pcibios_resource_to_bus(bridge, ®ion, res);
541 if (res->flags & IORESOURCE_PREFETCH) {
542 l = (region.start >> 16) & 0xfff0;
543 l |= region.end & 0xfff00000;
544 if (res->flags & IORESOURCE_MEM_64) {
545 bu = upper_32_bits(region.start);
546 lu = upper_32_bits(region.end);
548 dev_info(&bridge->dev, " bridge window %pR\n", res);
552 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
554 /* Set the upper 32 bits of PREF base & limit. */
555 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
556 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
559 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
561 struct pci_dev *bridge = bus->self;
563 dev_info(&bridge->dev, "PCI bridge to %pR\n",
566 if (type & IORESOURCE_IO)
567 pci_setup_bridge_io(bus);
569 if (type & IORESOURCE_MEM)
570 pci_setup_bridge_mmio(bus);
572 if (type & IORESOURCE_PREFETCH)
573 pci_setup_bridge_mmio_pref(bus);
575 pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
578 void pci_setup_bridge(struct pci_bus *bus)
580 unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
583 __pci_setup_bridge(bus, type);
586 /* Check whether the bridge supports optional I/O and
587 prefetchable memory ranges. If not, the respective
588 base/limit registers must be read-only and read as 0. */
589 static void pci_bridge_check_ranges(struct pci_bus *bus)
593 struct pci_dev *bridge = bus->self;
594 struct resource *b_res;
596 b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
597 b_res[1].flags |= IORESOURCE_MEM;
599 pci_read_config_word(bridge, PCI_IO_BASE, &io);
601 pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
602 pci_read_config_word(bridge, PCI_IO_BASE, &io);
603 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
606 b_res[0].flags |= IORESOURCE_IO;
607 /* DECchip 21050 pass 2 errata: the bridge may miss an address
608 disconnect boundary by one PCI data phase.
609 Workaround: do not use prefetching on this device. */
610 if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
612 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
614 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
616 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
617 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
620 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
621 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
622 PCI_PREF_RANGE_TYPE_64) {
623 b_res[2].flags |= IORESOURCE_MEM_64;
624 b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
628 /* double check if bridge does support 64 bit pref */
629 if (b_res[2].flags & IORESOURCE_MEM_64) {
630 u32 mem_base_hi, tmp;
631 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
633 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
635 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
637 b_res[2].flags &= ~IORESOURCE_MEM_64;
638 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
643 /* Helper function for sizing routines: find first available
644 bus resource of a given type. Note: we intentionally skip
645 the bus resources which have already been assigned (that is,
646 have non-NULL parent resource). */
647 static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
651 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
654 pci_bus_for_each_resource(bus, r, i) {
655 if (r == &ioport_resource || r == &iomem_resource)
657 if (r && (r->flags & type_mask) == type && !r->parent)
663 static resource_size_t calculate_iosize(resource_size_t size,
664 resource_size_t min_size,
665 resource_size_t size1,
666 resource_size_t old_size,
667 resource_size_t align)
673 /* To be fixed in 2.5: we should have sort of HAVE_ISA
674 flag in the struct pci_bus. */
675 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
676 size = (size & 0xff) + ((size & ~0xffUL) << 2);
678 size = ALIGN(size + size1, align);
684 static resource_size_t calculate_memsize(resource_size_t size,
685 resource_size_t min_size,
686 resource_size_t size1,
687 resource_size_t old_size,
688 resource_size_t align)
696 size = ALIGN(size + size1, align);
700 resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
706 #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */
707 #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */
708 #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */
710 static resource_size_t window_alignment(struct pci_bus *bus,
713 resource_size_t align = 1, arch_align;
715 if (type & IORESOURCE_MEM)
716 align = PCI_P2P_DEFAULT_MEM_ALIGN;
717 else if (type & IORESOURCE_IO) {
719 * Per spec, I/O windows are 4K-aligned, but some
720 * bridges have an extension to support 1K alignment.
722 if (bus->self->io_window_1k)
723 align = PCI_P2P_DEFAULT_IO_ALIGN_1K;
725 align = PCI_P2P_DEFAULT_IO_ALIGN;
728 arch_align = pcibios_window_alignment(bus, type);
729 return max(align, arch_align);
733 * pbus_size_io() - size the io window of a given bus
736 * @min_size : the minimum io window that must to be allocated
737 * @add_size : additional optional io window
738 * @realloc_head : track the additional io window on this list
740 * Sizing the IO windows of the PCI-PCI bridge is trivial,
741 * since these windows have 1K or 4K granularity and the IO ranges
742 * of non-bridge PCI devices are limited to 256 bytes.
743 * We must be careful with the ISA aliasing though.
745 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
746 resource_size_t add_size, struct list_head *realloc_head)
749 struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
750 unsigned long size = 0, size0 = 0, size1 = 0;
751 resource_size_t children_add_size = 0;
752 resource_size_t min_align, io_align, align;
757 io_align = min_align = window_alignment(bus, IORESOURCE_IO);
758 list_for_each_entry(dev, &bus->devices, bus_list) {
761 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
762 struct resource *r = &dev->resource[i];
763 unsigned long r_size;
765 if (r->parent || !(r->flags & IORESOURCE_IO))
767 r_size = resource_size(r);
770 /* Might be re-aligned for ISA */
775 align = pci_resource_alignment(dev, r);
776 if (align > min_align)
780 children_add_size += get_res_add_size(realloc_head, r);
784 if (min_align > io_align)
785 min_align = io_align;
787 size0 = calculate_iosize(size, min_size, size1,
788 resource_size(b_res), min_align);
789 if (children_add_size > add_size)
790 add_size = children_add_size;
791 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
792 calculate_iosize(size, min_size, add_size + size1,
793 resource_size(b_res), min_align);
794 if (!size0 && !size1) {
795 if (b_res->start || b_res->end)
796 dev_info(&bus->self->dev, "disabling bridge window "
797 "%pR to %pR (unused)\n", b_res,
803 b_res->start = min_align;
804 b_res->end = b_res->start + size0 - 1;
805 b_res->flags |= IORESOURCE_STARTALIGN;
806 if (size1 > size0 && realloc_head) {
807 add_to_list(realloc_head, bus->self, b_res, size1-size0,
809 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window "
810 "%pR to %pR add_size %lx\n", b_res,
811 &bus->busn_res, size1-size0);
815 static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
818 resource_size_t align = 0;
819 resource_size_t min_align = 0;
822 for (order = 0; order <= max_order; order++) {
823 resource_size_t align1 = 1;
825 align1 <<= (order + 20);
829 else if (ALIGN(align + min_align, min_align) < align1)
830 min_align = align1 >> 1;
831 align += aligns[order];
838 * pbus_size_mem() - size the memory window of a given bus
841 * @min_size : the minimum memory window that must to be allocated
842 * @add_size : additional optional memory window
843 * @realloc_head : track the additional memory window on this list
845 * Calculate the size of the bus and minimal alignment which
846 * guarantees that all child resources fit in this size.
848 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
849 unsigned long type, resource_size_t min_size,
850 resource_size_t add_size,
851 struct list_head *realloc_head)
854 resource_size_t min_align, align, size, size0, size1;
855 resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
856 int order, max_order;
857 struct resource *b_res = find_free_bus_resource(bus, type);
858 unsigned int mem64_mask = 0;
859 resource_size_t children_add_size = 0;
864 memset(aligns, 0, sizeof(aligns));
868 mem64_mask = b_res->flags & IORESOURCE_MEM_64;
869 b_res->flags &= ~IORESOURCE_MEM_64;
871 list_for_each_entry(dev, &bus->devices, bus_list) {
874 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
875 struct resource *r = &dev->resource[i];
876 resource_size_t r_size;
878 if (r->parent || (r->flags & mask) != type)
880 r_size = resource_size(r);
881 #ifdef CONFIG_PCI_IOV
882 /* put SRIOV requested res to the optional list */
883 if (realloc_head && i >= PCI_IOV_RESOURCES &&
884 i <= PCI_IOV_RESOURCE_END) {
885 r->end = r->start - 1;
886 add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */);
887 children_add_size += r_size;
891 /* For bridges size != alignment */
892 align = pci_resource_alignment(dev, r);
893 order = __ffs(align) - 20;
895 dev_warn(&dev->dev, "disabling BAR %d: %pR "
896 "(bad alignment %#llx)\n", i, r,
897 (unsigned long long) align);
904 /* Exclude ranges with size > align from
905 calculation of the alignment. */
907 aligns[order] += align;
908 if (order > max_order)
910 mem64_mask &= r->flags & IORESOURCE_MEM_64;
913 children_add_size += get_res_add_size(realloc_head, r);
917 min_align = calculate_mem_align(aligns, max_order);
918 min_align = max(min_align, window_alignment(bus, b_res->flags & mask));
919 size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
920 if (children_add_size > add_size)
921 add_size = children_add_size;
922 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
923 calculate_memsize(size, min_size, add_size,
924 resource_size(b_res), min_align);
925 if (!size0 && !size1) {
926 if (b_res->start || b_res->end)
927 dev_info(&bus->self->dev, "disabling bridge window "
928 "%pR to %pR (unused)\n", b_res,
933 b_res->start = min_align;
934 b_res->end = size0 + min_align - 1;
935 b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
936 if (size1 > size0 && realloc_head) {
937 add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align);
938 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window "
939 "%pR to %pR add_size %llx\n", b_res,
940 &bus->busn_res, (unsigned long long)size1-size0);
945 unsigned long pci_cardbus_resource_alignment(struct resource *res)
947 if (res->flags & IORESOURCE_IO)
948 return pci_cardbus_io_size;
949 if (res->flags & IORESOURCE_MEM)
950 return pci_cardbus_mem_size;
954 static void pci_bus_size_cardbus(struct pci_bus *bus,
955 struct list_head *realloc_head)
957 struct pci_dev *bridge = bus->self;
958 struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
959 resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
965 * Reserve some resources for CardBus. We reserve
966 * a fixed amount of bus space for CardBus bridges.
968 b_res[0].start = pci_cardbus_io_size;
969 b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
970 b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
972 b_res[0].end -= pci_cardbus_io_size;
973 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
974 pci_cardbus_io_size);
980 b_res[1].start = pci_cardbus_io_size;
981 b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
982 b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
984 b_res[1].end -= pci_cardbus_io_size;
985 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size,
986 pci_cardbus_io_size);
990 /* MEM1 must not be pref mmio */
991 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
992 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
993 ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
994 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
995 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
999 * Check whether prefetchable memory is supported
1002 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1003 if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
1004 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
1005 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1006 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1009 if (b_res[2].parent)
1010 goto handle_b_res_3;
1012 * If we have prefetchable memory support, allocate
1013 * two regions. Otherwise, allocate one region of
1016 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
1017 b_res[2].start = pci_cardbus_mem_size;
1018 b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
1019 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
1020 IORESOURCE_STARTALIGN;
1022 b_res[2].end -= pci_cardbus_mem_size;
1023 add_to_list(realloc_head, bridge, b_res+2,
1024 pci_cardbus_mem_size, pci_cardbus_mem_size);
1027 /* reduce that to half */
1028 b_res_3_size = pci_cardbus_mem_size;
1032 if (b_res[3].parent)
1034 b_res[3].start = pci_cardbus_mem_size;
1035 b_res[3].end = b_res[3].start + b_res_3_size - 1;
1036 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
1038 b_res[3].end -= b_res_3_size;
1039 add_to_list(realloc_head, bridge, b_res+3, b_res_3_size,
1040 pci_cardbus_mem_size);
1047 void __ref __pci_bus_size_bridges(struct pci_bus *bus,
1048 struct list_head *realloc_head)
1050 struct pci_dev *dev;
1051 unsigned long mask, prefmask;
1052 resource_size_t additional_mem_size = 0, additional_io_size = 0;
1054 list_for_each_entry(dev, &bus->devices, bus_list) {
1055 struct pci_bus *b = dev->subordinate;
1059 switch (dev->class >> 8) {
1060 case PCI_CLASS_BRIDGE_CARDBUS:
1061 pci_bus_size_cardbus(b, realloc_head);
1064 case PCI_CLASS_BRIDGE_PCI:
1066 __pci_bus_size_bridges(b, realloc_head);
1075 switch (bus->self->class >> 8) {
1076 case PCI_CLASS_BRIDGE_CARDBUS:
1077 /* don't size cardbuses yet. */
1080 case PCI_CLASS_BRIDGE_PCI:
1081 pci_bridge_check_ranges(bus);
1082 if (bus->self->is_hotplug_bridge) {
1083 additional_io_size = pci_hotplug_io_size;
1084 additional_mem_size = pci_hotplug_mem_size;
1090 pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
1091 additional_io_size, realloc_head);
1092 /* If the bridge supports prefetchable range, size it
1093 separately. If it doesn't, or its prefetchable window
1094 has already been allocated by arch code, try
1095 non-prefetchable range for both types of PCI memory
1097 mask = IORESOURCE_MEM;
1098 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
1099 if (pbus_size_mem(bus, prefmask, prefmask,
1100 realloc_head ? 0 : additional_mem_size,
1101 additional_mem_size, realloc_head))
1102 mask = prefmask; /* Success, size non-prefetch only. */
1104 additional_mem_size += additional_mem_size;
1105 pbus_size_mem(bus, mask, IORESOURCE_MEM,
1106 realloc_head ? 0 : additional_mem_size,
1107 additional_mem_size, realloc_head);
1112 void __ref pci_bus_size_bridges(struct pci_bus *bus)
1114 __pci_bus_size_bridges(bus, NULL);
1116 EXPORT_SYMBOL(pci_bus_size_bridges);
1118 void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
1119 struct list_head *realloc_head,
1120 struct list_head *fail_head)
1123 struct pci_dev *dev;
1125 pbus_assign_resources_sorted(bus, realloc_head, fail_head);
1127 list_for_each_entry(dev, &bus->devices, bus_list) {
1128 b = dev->subordinate;
1132 __pci_bus_assign_resources(b, realloc_head, fail_head);
1134 switch (dev->class >> 8) {
1135 case PCI_CLASS_BRIDGE_PCI:
1136 if (!pci_is_enabled(dev))
1137 pci_setup_bridge(b);
1140 case PCI_CLASS_BRIDGE_CARDBUS:
1141 pci_setup_cardbus(b);
1145 dev_info(&dev->dev, "not setting up bridge for bus "
1146 "%04x:%02x\n", pci_domain_nr(b), b->number);
1152 void __ref pci_bus_assign_resources(const struct pci_bus *bus)
1154 __pci_bus_assign_resources(bus, NULL, NULL);
1156 EXPORT_SYMBOL(pci_bus_assign_resources);
1158 static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
1159 struct list_head *add_head,
1160 struct list_head *fail_head)
1164 pdev_assign_resources_sorted((struct pci_dev *)bridge,
1165 add_head, fail_head);
1167 b = bridge->subordinate;
1171 __pci_bus_assign_resources(b, add_head, fail_head);
1173 switch (bridge->class >> 8) {
1174 case PCI_CLASS_BRIDGE_PCI:
1175 pci_setup_bridge(b);
1178 case PCI_CLASS_BRIDGE_CARDBUS:
1179 pci_setup_cardbus(b);
1183 dev_info(&bridge->dev, "not setting up bridge for bus "
1184 "%04x:%02x\n", pci_domain_nr(b), b->number);
1188 static void pci_bridge_release_resources(struct pci_bus *bus,
1192 bool changed = false;
1193 struct pci_dev *dev;
1195 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1196 IORESOURCE_PREFETCH;
1199 for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
1201 r = &dev->resource[idx];
1202 if ((r->flags & type_mask) != type)
1207 * if there are children under that, we should release them
1210 release_child_resources(r);
1211 if (!release_resource(r)) {
1212 dev_printk(KERN_DEBUG, &dev->dev,
1213 "resource %d %pR released\n", idx, r);
1214 /* keep the old size */
1215 r->end = resource_size(r) - 1;
1223 /* avoiding touch the one without PREF */
1224 if (type & IORESOURCE_PREFETCH)
1225 type = IORESOURCE_PREFETCH;
1226 __pci_setup_bridge(bus, type);
1235 * try to release pci bridge resources that is from leaf bridge,
1236 * so we can allocate big new one later
1238 static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
1240 enum release_type rel_type)
1242 struct pci_dev *dev;
1243 bool is_leaf_bridge = true;
1245 list_for_each_entry(dev, &bus->devices, bus_list) {
1246 struct pci_bus *b = dev->subordinate;
1250 is_leaf_bridge = false;
1252 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1255 if (rel_type == whole_subtree)
1256 pci_bus_release_bridge_resources(b, type,
1260 if (pci_is_root_bus(bus))
1263 if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1266 if ((rel_type == whole_subtree) || is_leaf_bridge)
1267 pci_bridge_release_resources(bus, type);
1270 static void pci_bus_dump_res(struct pci_bus *bus)
1272 struct resource *res;
1275 pci_bus_for_each_resource(bus, res, i) {
1276 if (!res || !res->end || !res->flags)
1279 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
1283 static void pci_bus_dump_resources(struct pci_bus *bus)
1286 struct pci_dev *dev;
1289 pci_bus_dump_res(bus);
1291 list_for_each_entry(dev, &bus->devices, bus_list) {
1292 b = dev->subordinate;
1296 pci_bus_dump_resources(b);
1300 static int __init pci_bus_get_depth(struct pci_bus *bus)
1303 struct pci_dev *dev;
1305 list_for_each_entry(dev, &bus->devices, bus_list) {
1307 struct pci_bus *b = dev->subordinate;
1311 ret = pci_bus_get_depth(b);
1312 if (ret + 1 > depth)
1318 static int __init pci_get_max_depth(void)
1321 struct pci_bus *bus;
1323 list_for_each_entry(bus, &pci_root_buses, node) {
1326 ret = pci_bus_get_depth(bus);
1335 * -1: undefined, will auto detect later
1336 * 0: disabled by user
1337 * 1: disabled by auto detect
1338 * 2: enabled by user
1339 * 3: enabled by auto detect
1349 static enum enable_type pci_realloc_enable __initdata = undefined;
1350 void __init pci_realloc_get_opt(char *str)
1352 if (!strncmp(str, "off", 3))
1353 pci_realloc_enable = user_disabled;
1354 else if (!strncmp(str, "on", 2))
1355 pci_realloc_enable = user_enabled;
1357 static bool __init pci_realloc_enabled(void)
1359 return pci_realloc_enable >= user_enabled;
1362 static void __init pci_realloc_detect(void)
1364 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
1365 struct pci_dev *dev = NULL;
1367 if (pci_realloc_enable != undefined)
1370 for_each_pci_dev(dev) {
1373 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
1374 struct resource *r = &dev->resource[i];
1376 /* Not assigned, or rejected by kernel ? */
1377 if (r->flags && !r->start) {
1378 pci_realloc_enable = auto_enabled;
1388 * first try will not touch pci bridge res
1389 * second and later try will clear small leaf bridge res
1390 * will stop till to the max deepth if can not find good one
1393 pci_assign_unassigned_resources(void)
1395 struct pci_bus *bus;
1396 LIST_HEAD(realloc_head); /* list of resources that
1397 want additional resources */
1398 struct list_head *add_list = NULL;
1399 int tried_times = 0;
1400 enum release_type rel_type = leaf_only;
1401 LIST_HEAD(fail_head);
1402 struct pci_dev_resource *fail_res;
1403 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1404 IORESOURCE_PREFETCH;
1405 int pci_try_num = 1;
1407 /* don't realloc if asked to do so */
1408 pci_realloc_detect();
1409 if (pci_realloc_enabled()) {
1410 int max_depth = pci_get_max_depth();
1412 pci_try_num = max_depth + 1;
1413 printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
1414 max_depth, pci_try_num);
1419 * last try will use add_list, otherwise will try good to have as
1420 * must have, so can realloc parent bridge resource
1422 if (tried_times + 1 == pci_try_num)
1423 add_list = &realloc_head;
1424 /* Depth first, calculate sizes and alignments of all
1425 subordinate buses. */
1426 list_for_each_entry(bus, &pci_root_buses, node)
1427 __pci_bus_size_bridges(bus, add_list);
1429 /* Depth last, allocate resources and update the hardware. */
1430 list_for_each_entry(bus, &pci_root_buses, node)
1431 __pci_bus_assign_resources(bus, add_list, &fail_head);
1433 BUG_ON(!list_empty(add_list));
1436 /* any device complain? */
1437 if (list_empty(&fail_head))
1438 goto enable_and_dump;
1440 if (tried_times >= pci_try_num) {
1441 if (pci_realloc_enable == undefined)
1442 printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n");
1443 else if (pci_realloc_enable == auto_enabled)
1444 printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
1446 free_list(&fail_head);
1447 goto enable_and_dump;
1450 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1453 /* third times and later will not check if it is leaf */
1454 if ((tried_times + 1) > 2)
1455 rel_type = whole_subtree;
1458 * Try to release leaf bridge's resources that doesn't fit resource of
1459 * child device under that bridge
1461 list_for_each_entry(fail_res, &fail_head, list) {
1462 bus = fail_res->dev->bus;
1463 pci_bus_release_bridge_resources(bus,
1464 fail_res->flags & type_mask,
1467 /* restore size and flags */
1468 list_for_each_entry(fail_res, &fail_head, list) {
1469 struct resource *res = fail_res->res;
1471 res->start = fail_res->start;
1472 res->end = fail_res->end;
1473 res->flags = fail_res->flags;
1474 if (fail_res->dev->subordinate)
1477 free_list(&fail_head);
1482 /* Depth last, update the hardware. */
1483 list_for_each_entry(bus, &pci_root_buses, node)
1484 pci_enable_bridges(bus);
1486 /* dump the resource on buses */
1487 list_for_each_entry(bus, &pci_root_buses, node)
1488 pci_bus_dump_resources(bus);
1491 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1493 struct pci_bus *parent = bridge->subordinate;
1494 LIST_HEAD(add_list); /* list of resources that
1495 want additional resources */
1496 int tried_times = 0;
1497 LIST_HEAD(fail_head);
1498 struct pci_dev_resource *fail_res;
1500 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1501 IORESOURCE_PREFETCH;
1504 __pci_bus_size_bridges(parent, &add_list);
1505 __pci_bridge_assign_resources(bridge, &add_list, &fail_head);
1506 BUG_ON(!list_empty(&add_list));
1509 if (list_empty(&fail_head))
1512 if (tried_times >= 2) {
1513 /* still fail, don't need to try more */
1514 free_list(&fail_head);
1518 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1522 * Try to release leaf bridge's resources that doesn't fit resource of
1523 * child device under that bridge
1525 list_for_each_entry(fail_res, &fail_head, list) {
1526 struct pci_bus *bus = fail_res->dev->bus;
1527 unsigned long flags = fail_res->flags;
1529 pci_bus_release_bridge_resources(bus, flags & type_mask,
1532 /* restore size and flags */
1533 list_for_each_entry(fail_res, &fail_head, list) {
1534 struct resource *res = fail_res->res;
1536 res->start = fail_res->start;
1537 res->end = fail_res->end;
1538 res->flags = fail_res->flags;
1539 if (fail_res->dev->subordinate)
1542 free_list(&fail_head);
1547 retval = pci_reenable_device(bridge);
1549 dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
1550 pci_set_master(bridge);
1551 pci_enable_bridges(parent);
1553 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
1555 void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
1557 struct pci_dev *dev;
1558 LIST_HEAD(add_list); /* list of resources that
1559 want additional resources */
1561 down_read(&pci_bus_sem);
1562 list_for_each_entry(dev, &bus->devices, bus_list)
1563 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
1564 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
1565 if (dev->subordinate)
1566 __pci_bus_size_bridges(dev->subordinate,
1568 up_read(&pci_bus_sem);
1569 __pci_bus_assign_resources(bus, &add_list, NULL);
1570 BUG_ON(!list_empty(&add_list));