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>
30 unsigned int pci_flags;
32 struct pci_dev_resource {
33 struct list_head list;
36 resource_size_t start;
38 resource_size_t add_size;
39 resource_size_t min_align;
43 static void free_list(struct list_head *head)
45 struct pci_dev_resource *dev_res, *tmp;
47 list_for_each_entry_safe(dev_res, tmp, head, list) {
48 list_del(&dev_res->list);
54 * add_to_list() - add a new resource tracker to the list
55 * @head: Head of the list
56 * @dev: device corresponding to which the resource
58 * @res: The resource to be tracked
59 * @add_size: additional size to be optionally added
62 static int add_to_list(struct list_head *head,
63 struct pci_dev *dev, struct resource *res,
64 resource_size_t add_size, resource_size_t min_align)
66 struct pci_dev_resource *tmp;
68 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
70 pr_warn("add_to_list: kmalloc() failed!\n");
76 tmp->start = res->start;
78 tmp->flags = res->flags;
79 tmp->add_size = add_size;
80 tmp->min_align = min_align;
82 list_add(&tmp->list, head);
87 static void remove_from_list(struct list_head *head,
90 struct pci_dev_resource *dev_res, *tmp;
92 list_for_each_entry_safe(dev_res, tmp, head, list) {
93 if (dev_res->res == res) {
94 list_del(&dev_res->list);
101 static struct pci_dev_resource *res_to_dev_res(struct list_head *head,
102 struct resource *res)
104 struct pci_dev_resource *dev_res;
106 list_for_each_entry(dev_res, head, list) {
107 if (dev_res->res == res) {
108 int idx = res - &dev_res->dev->resource[0];
110 dev_printk(KERN_DEBUG, &dev_res->dev->dev,
111 "res[%d]=%pR res_to_dev_res add_size %llx min_align %llx\n",
113 (unsigned long long)dev_res->add_size,
114 (unsigned long long)dev_res->min_align);
123 static resource_size_t get_res_add_size(struct list_head *head,
124 struct resource *res)
126 struct pci_dev_resource *dev_res;
128 dev_res = res_to_dev_res(head, res);
129 return dev_res ? dev_res->add_size : 0;
132 static resource_size_t get_res_add_align(struct list_head *head,
133 struct resource *res)
135 struct pci_dev_resource *dev_res;
137 dev_res = res_to_dev_res(head, res);
138 return dev_res ? dev_res->min_align : 0;
142 /* Sort resources by alignment */
143 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
147 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
149 struct pci_dev_resource *dev_res, *tmp;
150 resource_size_t r_align;
153 r = &dev->resource[i];
155 if (r->flags & IORESOURCE_PCI_FIXED)
158 if (!(r->flags) || r->parent)
161 r_align = pci_resource_alignment(dev, r);
163 dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n",
168 tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
170 panic("pdev_sort_resources(): kmalloc() failed!\n");
174 /* fallback is smallest one or list is empty*/
176 list_for_each_entry(dev_res, head, list) {
177 resource_size_t align;
179 align = pci_resource_alignment(dev_res->dev,
182 if (r_align > align) {
187 /* Insert it just before n*/
188 list_add_tail(&tmp->list, n);
192 static void __dev_sort_resources(struct pci_dev *dev,
193 struct list_head *head)
195 u16 class = dev->class >> 8;
197 /* Don't touch classless devices or host bridges or ioapics. */
198 if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
201 /* Don't touch ioapic devices already enabled by firmware */
202 if (class == PCI_CLASS_SYSTEM_PIC) {
204 pci_read_config_word(dev, PCI_COMMAND, &command);
205 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
209 pdev_sort_resources(dev, head);
212 static inline void reset_resource(struct resource *res)
220 * reassign_resources_sorted() - satisfy any additional resource requests
222 * @realloc_head : head of the list tracking requests requiring additional
224 * @head : head of the list tracking requests with allocated
227 * Walk through each element of the realloc_head and try to procure
228 * additional resources for the element, provided the element
229 * is in the head list.
231 static void reassign_resources_sorted(struct list_head *realloc_head,
232 struct list_head *head)
234 struct resource *res;
235 struct pci_dev_resource *add_res, *tmp;
236 struct pci_dev_resource *dev_res;
237 resource_size_t add_size, align;
240 list_for_each_entry_safe(add_res, tmp, realloc_head, list) {
241 bool found_match = false;
244 /* skip resource that has been reset */
248 /* skip this resource if not found in head list */
249 list_for_each_entry(dev_res, head, list) {
250 if (dev_res->res == res) {
255 if (!found_match)/* just skip */
258 idx = res - &add_res->dev->resource[0];
259 add_size = add_res->add_size;
260 align = add_res->min_align;
261 if (!resource_size(res)) {
263 res->end = res->start + add_size - 1;
264 if (pci_assign_resource(add_res->dev, idx))
267 res->flags |= add_res->flags &
268 (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
269 if (pci_reassign_resource(add_res->dev, idx,
271 dev_printk(KERN_DEBUG, &add_res->dev->dev,
272 "failed to add %llx res[%d]=%pR\n",
273 (unsigned long long)add_size,
277 list_del(&add_res->list);
283 * assign_requested_resources_sorted() - satisfy resource requests
285 * @head : head of the list tracking requests for resources
286 * @fail_head : head of the list tracking requests that could
289 * Satisfy resource requests of each element in the list. Add
290 * requests that could not satisfied to the failed_list.
292 static void assign_requested_resources_sorted(struct list_head *head,
293 struct list_head *fail_head)
295 struct resource *res;
296 struct pci_dev_resource *dev_res;
299 list_for_each_entry(dev_res, head, list) {
301 idx = res - &dev_res->dev->resource[0];
302 if (resource_size(res) &&
303 pci_assign_resource(dev_res->dev, idx)) {
306 * if the failed res is for ROM BAR, and it will
307 * be enabled later, don't add it to the list
309 if (!((idx == PCI_ROM_RESOURCE) &&
310 (!(res->flags & IORESOURCE_ROM_ENABLE))))
311 add_to_list(fail_head,
321 static unsigned long pci_fail_res_type_mask(struct list_head *fail_head)
323 struct pci_dev_resource *fail_res;
324 unsigned long mask = 0;
326 /* check failed type */
327 list_for_each_entry(fail_res, fail_head, list)
328 mask |= fail_res->flags;
331 * one pref failed resource will set IORESOURCE_MEM,
332 * as we can allocate pref in non-pref range.
333 * Will release all assigned non-pref sibling resources
334 * according to that bit.
336 return mask & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH);
339 static bool pci_need_to_release(unsigned long mask, struct resource *res)
341 if (res->flags & IORESOURCE_IO)
342 return !!(mask & IORESOURCE_IO);
344 /* check pref at first */
345 if (res->flags & IORESOURCE_PREFETCH) {
346 if (mask & IORESOURCE_PREFETCH)
348 /* count pref if its parent is non-pref */
349 else if ((mask & IORESOURCE_MEM) &&
350 !(res->parent->flags & IORESOURCE_PREFETCH))
356 if (res->flags & IORESOURCE_MEM)
357 return !!(mask & IORESOURCE_MEM);
359 return false; /* should not get here */
362 static void __assign_resources_sorted(struct list_head *head,
363 struct list_head *realloc_head,
364 struct list_head *fail_head)
367 * Should not assign requested resources at first.
368 * they could be adjacent, so later reassign can not reallocate
369 * them one by one in parent resource window.
370 * Try to assign requested + add_size at beginning
371 * if could do that, could get out early.
372 * if could not do that, we still try to assign requested at first,
373 * then try to reassign add_size for some resources.
375 * Separate three resource type checking if we need to release
376 * assigned resource after requested + add_size try.
377 * 1. if there is io port assign fail, will release assigned
379 * 2. if there is pref mmio assign fail, release assigned
381 * if assigned pref mmio's parent is non-pref mmio and there
382 * is non-pref mmio assign fail, will release that assigned
384 * 3. if there is non-pref mmio assign fail or pref mmio
385 * assigned fail, will release assigned non-pref mmio.
387 LIST_HEAD(save_head);
388 LIST_HEAD(local_fail_head);
389 struct pci_dev_resource *save_res;
390 struct pci_dev_resource *dev_res, *tmp_res, *dev_res2;
391 unsigned long fail_type;
392 resource_size_t add_align, align;
394 /* Check if optional add_size is there */
395 if (!realloc_head || list_empty(realloc_head))
396 goto requested_and_reassign;
398 /* Save original start, end, flags etc at first */
399 list_for_each_entry(dev_res, head, list) {
400 if (add_to_list(&save_head, dev_res->dev, dev_res->res, 0, 0)) {
401 free_list(&save_head);
402 goto requested_and_reassign;
406 /* Update res in head list with add_size in realloc_head list */
407 list_for_each_entry_safe(dev_res, tmp_res, head, list) {
408 dev_res->res->end += get_res_add_size(realloc_head,
412 * There are two kinds of additional resources in the list:
413 * 1. bridge resource -- IORESOURCE_STARTALIGN
414 * 2. SR-IOV resource -- IORESOURCE_SIZEALIGN
415 * Here just fix the additional alignment for bridge
417 if (!(dev_res->res->flags & IORESOURCE_STARTALIGN))
420 add_align = get_res_add_align(realloc_head, dev_res->res);
423 * The "head" list is sorted by the alignment to make sure
424 * resources with bigger alignment will be assigned first.
425 * After we change the alignment of a dev_res in "head" list,
426 * we need to reorder the list by alignment to make it
429 if (add_align > dev_res->res->start) {
430 resource_size_t r_size = resource_size(dev_res->res);
432 dev_res->res->start = add_align;
433 dev_res->res->end = add_align + r_size - 1;
435 list_for_each_entry(dev_res2, head, list) {
436 align = pci_resource_alignment(dev_res2->dev,
438 if (add_align > align) {
439 list_move_tail(&dev_res->list,
448 /* Try updated head list with add_size added */
449 assign_requested_resources_sorted(head, &local_fail_head);
451 /* all assigned with add_size ? */
452 if (list_empty(&local_fail_head)) {
453 /* Remove head list from realloc_head list */
454 list_for_each_entry(dev_res, head, list)
455 remove_from_list(realloc_head, dev_res->res);
456 free_list(&save_head);
461 /* check failed type */
462 fail_type = pci_fail_res_type_mask(&local_fail_head);
463 /* remove not need to be released assigned res from head list etc */
464 list_for_each_entry_safe(dev_res, tmp_res, head, list)
465 if (dev_res->res->parent &&
466 !pci_need_to_release(fail_type, dev_res->res)) {
467 /* remove it from realloc_head list */
468 remove_from_list(realloc_head, dev_res->res);
469 remove_from_list(&save_head, dev_res->res);
470 list_del(&dev_res->list);
474 free_list(&local_fail_head);
475 /* Release assigned resource */
476 list_for_each_entry(dev_res, head, list)
477 if (dev_res->res->parent)
478 release_resource(dev_res->res);
479 /* Restore start/end/flags from saved list */
480 list_for_each_entry(save_res, &save_head, list) {
481 struct resource *res = save_res->res;
483 res->start = save_res->start;
484 res->end = save_res->end;
485 res->flags = save_res->flags;
487 free_list(&save_head);
489 requested_and_reassign:
490 /* Satisfy the must-have resource requests */
491 assign_requested_resources_sorted(head, fail_head);
493 /* Try to satisfy any additional optional resource
496 reassign_resources_sorted(realloc_head, head);
500 static void pdev_assign_resources_sorted(struct pci_dev *dev,
501 struct list_head *add_head,
502 struct list_head *fail_head)
506 __dev_sort_resources(dev, &head);
507 __assign_resources_sorted(&head, add_head, fail_head);
511 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
512 struct list_head *realloc_head,
513 struct list_head *fail_head)
518 list_for_each_entry(dev, &bus->devices, bus_list)
519 __dev_sort_resources(dev, &head);
521 __assign_resources_sorted(&head, realloc_head, fail_head);
524 void pci_setup_cardbus(struct pci_bus *bus)
526 struct pci_dev *bridge = bus->self;
527 struct resource *res;
528 struct pci_bus_region region;
530 dev_info(&bridge->dev, "CardBus bridge to %pR\n",
533 res = bus->resource[0];
534 pcibios_resource_to_bus(bridge->bus, ®ion, res);
535 if (res->flags & IORESOURCE_IO) {
537 * The IO resource is allocated a range twice as large as it
538 * would normally need. This allows us to set both IO regs.
540 dev_info(&bridge->dev, " bridge window %pR\n", res);
541 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
543 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
547 res = bus->resource[1];
548 pcibios_resource_to_bus(bridge->bus, ®ion, res);
549 if (res->flags & IORESOURCE_IO) {
550 dev_info(&bridge->dev, " bridge window %pR\n", res);
551 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
553 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
557 res = bus->resource[2];
558 pcibios_resource_to_bus(bridge->bus, ®ion, res);
559 if (res->flags & IORESOURCE_MEM) {
560 dev_info(&bridge->dev, " bridge window %pR\n", res);
561 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
563 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
567 res = bus->resource[3];
568 pcibios_resource_to_bus(bridge->bus, ®ion, res);
569 if (res->flags & IORESOURCE_MEM) {
570 dev_info(&bridge->dev, " bridge window %pR\n", res);
571 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
573 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
577 EXPORT_SYMBOL(pci_setup_cardbus);
579 /* Initialize bridges with base/limit values we have collected.
580 PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
581 requires that if there is no I/O ports or memory behind the
582 bridge, corresponding range must be turned off by writing base
583 value greater than limit to the bridge's base/limit registers.
585 Note: care must be taken when updating I/O base/limit registers
586 of bridges which support 32-bit I/O. This update requires two
587 config space writes, so it's quite possible that an I/O window of
588 the bridge will have some undesirable address (e.g. 0) after the
589 first write. Ditto 64-bit prefetchable MMIO. */
590 static void pci_setup_bridge_io(struct pci_dev *bridge)
592 struct resource *res;
593 struct pci_bus_region region;
594 unsigned long io_mask;
595 u8 io_base_lo, io_limit_lo;
599 io_mask = PCI_IO_RANGE_MASK;
600 if (bridge->io_window_1k)
601 io_mask = PCI_IO_1K_RANGE_MASK;
603 /* Set up the top and bottom of the PCI I/O segment for this bus. */
604 res = &bridge->resource[PCI_BRIDGE_RESOURCES + 0];
605 pcibios_resource_to_bus(bridge->bus, ®ion, res);
606 if (res->flags & IORESOURCE_IO) {
607 pci_read_config_word(bridge, PCI_IO_BASE, &l);
608 io_base_lo = (region.start >> 8) & io_mask;
609 io_limit_lo = (region.end >> 8) & io_mask;
610 l = ((u16) io_limit_lo << 8) | io_base_lo;
611 /* Set up upper 16 bits of I/O base/limit. */
612 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
613 dev_info(&bridge->dev, " bridge window %pR\n", res);
615 /* Clear upper 16 bits of I/O base/limit. */
619 /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
620 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
621 /* Update lower 16 bits of I/O base/limit. */
622 pci_write_config_word(bridge, PCI_IO_BASE, l);
623 /* Update upper 16 bits of I/O base/limit. */
624 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
627 static void pci_setup_bridge_mmio(struct pci_dev *bridge)
629 struct resource *res;
630 struct pci_bus_region region;
633 /* Set up the top and bottom of the PCI Memory segment for this bus. */
634 res = &bridge->resource[PCI_BRIDGE_RESOURCES + 1];
635 pcibios_resource_to_bus(bridge->bus, ®ion, res);
636 if (res->flags & IORESOURCE_MEM) {
637 l = (region.start >> 16) & 0xfff0;
638 l |= region.end & 0xfff00000;
639 dev_info(&bridge->dev, " bridge window %pR\n", res);
643 pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
646 static void pci_setup_bridge_mmio_pref(struct pci_dev *bridge)
648 struct resource *res;
649 struct pci_bus_region region;
652 /* Clear out the upper 32 bits of PREF limit.
653 If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
654 disables PREF range, which is ok. */
655 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
657 /* Set up PREF base/limit. */
659 res = &bridge->resource[PCI_BRIDGE_RESOURCES + 2];
660 pcibios_resource_to_bus(bridge->bus, ®ion, res);
661 if (res->flags & IORESOURCE_PREFETCH) {
662 l = (region.start >> 16) & 0xfff0;
663 l |= region.end & 0xfff00000;
664 if (res->flags & IORESOURCE_MEM_64) {
665 bu = upper_32_bits(region.start);
666 lu = upper_32_bits(region.end);
668 dev_info(&bridge->dev, " bridge window %pR\n", res);
672 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
674 /* Set the upper 32 bits of PREF base & limit. */
675 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
676 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
679 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
681 struct pci_dev *bridge = bus->self;
683 dev_info(&bridge->dev, "PCI bridge to %pR\n",
686 if (type & IORESOURCE_IO)
687 pci_setup_bridge_io(bridge);
689 if (type & IORESOURCE_MEM)
690 pci_setup_bridge_mmio(bridge);
692 if (type & IORESOURCE_PREFETCH)
693 pci_setup_bridge_mmio_pref(bridge);
695 pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
698 void pci_setup_bridge(struct pci_bus *bus)
700 unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
703 __pci_setup_bridge(bus, type);
707 int pci_claim_bridge_resource(struct pci_dev *bridge, int i)
709 if (i < PCI_BRIDGE_RESOURCES || i > PCI_BRIDGE_RESOURCE_END)
712 if (pci_claim_resource(bridge, i) == 0)
713 return 0; /* claimed the window */
715 if ((bridge->class >> 8) != PCI_CLASS_BRIDGE_PCI)
718 if (!pci_bus_clip_resource(bridge, i))
719 return -EINVAL; /* clipping didn't change anything */
721 switch (i - PCI_BRIDGE_RESOURCES) {
723 pci_setup_bridge_io(bridge);
726 pci_setup_bridge_mmio(bridge);
729 pci_setup_bridge_mmio_pref(bridge);
735 if (pci_claim_resource(bridge, i) == 0)
736 return 0; /* claimed a smaller window */
741 /* Check whether the bridge supports optional I/O and
742 prefetchable memory ranges. If not, the respective
743 base/limit registers must be read-only and read as 0. */
744 static void pci_bridge_check_ranges(struct pci_bus *bus)
748 struct pci_dev *bridge = bus->self;
749 struct resource *b_res;
751 b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
752 b_res[1].flags |= IORESOURCE_MEM;
754 pci_read_config_word(bridge, PCI_IO_BASE, &io);
756 pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0);
757 pci_read_config_word(bridge, PCI_IO_BASE, &io);
758 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
761 b_res[0].flags |= IORESOURCE_IO;
763 /* DECchip 21050 pass 2 errata: the bridge may miss an address
764 disconnect boundary by one PCI data phase.
765 Workaround: do not use prefetching on this device. */
766 if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
769 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
771 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
773 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
774 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
777 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
778 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
779 PCI_PREF_RANGE_TYPE_64) {
780 b_res[2].flags |= IORESOURCE_MEM_64;
781 b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
785 /* double check if bridge does support 64 bit pref */
786 if (b_res[2].flags & IORESOURCE_MEM_64) {
787 u32 mem_base_hi, tmp;
788 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
790 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
792 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
794 b_res[2].flags &= ~IORESOURCE_MEM_64;
795 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
800 /* Helper function for sizing routines: find first available
801 bus resource of a given type. Note: we intentionally skip
802 the bus resources which have already been assigned (that is,
803 have non-NULL parent resource). */
804 static struct resource *find_free_bus_resource(struct pci_bus *bus,
805 unsigned long type_mask, unsigned long type)
810 pci_bus_for_each_resource(bus, r, i) {
811 if (r == &ioport_resource || r == &iomem_resource)
813 if (r && (r->flags & type_mask) == type && !r->parent)
819 static resource_size_t calculate_iosize(resource_size_t size,
820 resource_size_t min_size,
821 resource_size_t size1,
822 resource_size_t old_size,
823 resource_size_t align)
829 /* To be fixed in 2.5: we should have sort of HAVE_ISA
830 flag in the struct pci_bus. */
831 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
832 size = (size & 0xff) + ((size & ~0xffUL) << 2);
834 size = ALIGN(size + size1, align);
840 static resource_size_t calculate_memsize(resource_size_t size,
841 resource_size_t min_size,
842 resource_size_t size1,
843 resource_size_t old_size,
844 resource_size_t align)
852 size = ALIGN(size + size1, align);
856 resource_size_t __weak pcibios_window_alignment(struct pci_bus *bus,
862 #define PCI_P2P_DEFAULT_MEM_ALIGN 0x100000 /* 1MiB */
863 #define PCI_P2P_DEFAULT_IO_ALIGN 0x1000 /* 4KiB */
864 #define PCI_P2P_DEFAULT_IO_ALIGN_1K 0x400 /* 1KiB */
866 static resource_size_t window_alignment(struct pci_bus *bus,
869 resource_size_t align = 1, arch_align;
871 if (type & IORESOURCE_MEM)
872 align = PCI_P2P_DEFAULT_MEM_ALIGN;
873 else if (type & IORESOURCE_IO) {
875 * Per spec, I/O windows are 4K-aligned, but some
876 * bridges have an extension to support 1K alignment.
878 if (bus->self->io_window_1k)
879 align = PCI_P2P_DEFAULT_IO_ALIGN_1K;
881 align = PCI_P2P_DEFAULT_IO_ALIGN;
884 arch_align = pcibios_window_alignment(bus, type);
885 return max(align, arch_align);
889 * pbus_size_io() - size the io window of a given bus
892 * @min_size : the minimum io window that must to be allocated
893 * @add_size : additional optional io window
894 * @realloc_head : track the additional io window on this list
896 * Sizing the IO windows of the PCI-PCI bridge is trivial,
897 * since these windows have 1K or 4K granularity and the IO ranges
898 * of non-bridge PCI devices are limited to 256 bytes.
899 * We must be careful with the ISA aliasing though.
901 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
902 resource_size_t add_size, struct list_head *realloc_head)
905 struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO,
907 resource_size_t size = 0, size0 = 0, size1 = 0;
908 resource_size_t children_add_size = 0;
909 resource_size_t min_align, align;
914 min_align = window_alignment(bus, IORESOURCE_IO);
915 list_for_each_entry(dev, &bus->devices, bus_list) {
918 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
919 struct resource *r = &dev->resource[i];
920 unsigned long r_size;
922 if (r->parent || !(r->flags & IORESOURCE_IO))
924 r_size = resource_size(r);
927 /* Might be re-aligned for ISA */
932 align = pci_resource_alignment(dev, r);
933 if (align > min_align)
937 children_add_size += get_res_add_size(realloc_head, r);
941 size0 = calculate_iosize(size, min_size, size1,
942 resource_size(b_res), min_align);
943 if (children_add_size > add_size)
944 add_size = children_add_size;
945 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
946 calculate_iosize(size, min_size, add_size + size1,
947 resource_size(b_res), min_align);
948 if (!size0 && !size1) {
949 if (b_res->start || b_res->end)
950 dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
951 b_res, &bus->busn_res);
956 b_res->start = min_align;
957 b_res->end = b_res->start + size0 - 1;
958 b_res->flags |= IORESOURCE_STARTALIGN;
959 if (size1 > size0 && realloc_head) {
960 add_to_list(realloc_head, bus->self, b_res, size1-size0,
962 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx\n",
963 b_res, &bus->busn_res,
964 (unsigned long long)size1-size0);
968 static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
971 resource_size_t align = 0;
972 resource_size_t min_align = 0;
975 for (order = 0; order <= max_order; order++) {
976 resource_size_t align1 = 1;
978 align1 <<= (order + 20);
982 else if (ALIGN(align + min_align, min_align) < align1)
983 min_align = align1 >> 1;
984 align += aligns[order];
991 * pbus_size_mem() - size the memory window of a given bus
994 * @mask: mask the resource flag, then compare it with type
995 * @type: the type of free resource from bridge
996 * @type2: second match type
997 * @type3: third match type
998 * @min_size : the minimum memory window that must to be allocated
999 * @add_size : additional optional memory window
1000 * @realloc_head : track the additional memory window on this list
1002 * Calculate the size of the bus and minimal alignment which
1003 * guarantees that all child resources fit in this size.
1005 * Returns -ENOSPC if there's no available bus resource of the desired type.
1006 * Otherwise, sets the bus resource start/end to indicate the required
1007 * size, adds things to realloc_head (if supplied), and returns 0.
1009 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
1010 unsigned long type, unsigned long type2,
1011 unsigned long type3,
1012 resource_size_t min_size, resource_size_t add_size,
1013 struct list_head *realloc_head)
1015 struct pci_dev *dev;
1016 resource_size_t min_align, align, size, size0, size1;
1017 resource_size_t aligns[18]; /* Alignments from 1Mb to 128Gb */
1018 int order, max_order;
1019 struct resource *b_res = find_free_bus_resource(bus,
1020 mask | IORESOURCE_PREFETCH, type);
1021 resource_size_t children_add_size = 0;
1022 resource_size_t children_add_align = 0;
1023 resource_size_t add_align = 0;
1028 memset(aligns, 0, sizeof(aligns));
1032 list_for_each_entry(dev, &bus->devices, bus_list) {
1035 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1036 struct resource *r = &dev->resource[i];
1037 resource_size_t r_size;
1039 if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
1040 ((r->flags & mask) != type &&
1041 (r->flags & mask) != type2 &&
1042 (r->flags & mask) != type3))
1044 r_size = resource_size(r);
1045 #ifdef CONFIG_PCI_IOV
1046 /* put SRIOV requested res to the optional list */
1047 if (realloc_head && i >= PCI_IOV_RESOURCES &&
1048 i <= PCI_IOV_RESOURCE_END) {
1049 add_align = max(pci_resource_alignment(dev, r), add_align);
1050 r->end = r->start - 1;
1051 add_to_list(realloc_head, dev, r, r_size, 0/* don't care */);
1052 children_add_size += r_size;
1057 * aligns[0] is for 1MB (since bridge memory
1058 * windows are always at least 1MB aligned), so
1059 * keep "order" from being negative for smaller
1062 align = pci_resource_alignment(dev, r);
1063 order = __ffs(align) - 20;
1066 if (order >= ARRAY_SIZE(aligns)) {
1067 dev_warn(&dev->dev, "disabling BAR %d: %pR (bad alignment %#llx)\n",
1068 i, r, (unsigned long long) align);
1073 /* Exclude ranges with size > align from
1074 calculation of the alignment. */
1075 if (r_size == align)
1076 aligns[order] += align;
1077 if (order > max_order)
1081 children_add_size += get_res_add_size(realloc_head, r);
1082 children_add_align = get_res_add_align(realloc_head, r);
1083 add_align = max(add_align, children_add_align);
1088 min_align = calculate_mem_align(aligns, max_order);
1089 min_align = max(min_align, window_alignment(bus, b_res->flags));
1090 size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
1091 add_align = max(min_align, add_align);
1092 if (children_add_size > add_size)
1093 add_size = children_add_size;
1094 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
1095 calculate_memsize(size, min_size, add_size,
1096 resource_size(b_res), add_align);
1097 if (!size0 && !size1) {
1098 if (b_res->start || b_res->end)
1099 dev_info(&bus->self->dev, "disabling bridge window %pR to %pR (unused)\n",
1100 b_res, &bus->busn_res);
1104 b_res->start = min_align;
1105 b_res->end = size0 + min_align - 1;
1106 b_res->flags |= IORESOURCE_STARTALIGN;
1107 if (size1 > size0 && realloc_head) {
1108 add_to_list(realloc_head, bus->self, b_res, size1-size0, add_align);
1109 dev_printk(KERN_DEBUG, &bus->self->dev, "bridge window %pR to %pR add_size %llx add_align %llx\n",
1110 b_res, &bus->busn_res,
1111 (unsigned long long) (size1 - size0),
1112 (unsigned long long) add_align);
1117 unsigned long pci_cardbus_resource_alignment(struct resource *res)
1119 if (res->flags & IORESOURCE_IO)
1120 return pci_cardbus_io_size;
1121 if (res->flags & IORESOURCE_MEM)
1122 return pci_cardbus_mem_size;
1126 static void pci_bus_size_cardbus(struct pci_bus *bus,
1127 struct list_head *realloc_head)
1129 struct pci_dev *bridge = bus->self;
1130 struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
1131 resource_size_t b_res_3_size = pci_cardbus_mem_size * 2;
1134 if (b_res[0].parent)
1135 goto handle_b_res_1;
1137 * Reserve some resources for CardBus. We reserve
1138 * a fixed amount of bus space for CardBus bridges.
1140 b_res[0].start = pci_cardbus_io_size;
1141 b_res[0].end = b_res[0].start + pci_cardbus_io_size - 1;
1142 b_res[0].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1144 b_res[0].end -= pci_cardbus_io_size;
1145 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size,
1146 pci_cardbus_io_size);
1150 if (b_res[1].parent)
1151 goto handle_b_res_2;
1152 b_res[1].start = pci_cardbus_io_size;
1153 b_res[1].end = b_res[1].start + pci_cardbus_io_size - 1;
1154 b_res[1].flags |= IORESOURCE_IO | IORESOURCE_STARTALIGN;
1156 b_res[1].end -= pci_cardbus_io_size;
1157 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size,
1158 pci_cardbus_io_size);
1162 /* MEM1 must not be pref mmio */
1163 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1164 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM1) {
1165 ctrl &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
1166 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1167 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1171 * Check whether prefetchable memory is supported
1174 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1175 if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
1176 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
1177 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
1178 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
1181 if (b_res[2].parent)
1182 goto handle_b_res_3;
1184 * If we have prefetchable memory support, allocate
1185 * two regions. Otherwise, allocate one region of
1188 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
1189 b_res[2].start = pci_cardbus_mem_size;
1190 b_res[2].end = b_res[2].start + pci_cardbus_mem_size - 1;
1191 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH |
1192 IORESOURCE_STARTALIGN;
1194 b_res[2].end -= pci_cardbus_mem_size;
1195 add_to_list(realloc_head, bridge, b_res+2,
1196 pci_cardbus_mem_size, pci_cardbus_mem_size);
1199 /* reduce that to half */
1200 b_res_3_size = pci_cardbus_mem_size;
1204 if (b_res[3].parent)
1206 b_res[3].start = pci_cardbus_mem_size;
1207 b_res[3].end = b_res[3].start + b_res_3_size - 1;
1208 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_STARTALIGN;
1210 b_res[3].end -= b_res_3_size;
1211 add_to_list(realloc_head, bridge, b_res+3, b_res_3_size,
1212 pci_cardbus_mem_size);
1219 void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
1221 struct pci_dev *dev;
1222 unsigned long mask, prefmask, type2 = 0, type3 = 0;
1223 resource_size_t additional_mem_size = 0, additional_io_size = 0;
1224 struct resource *b_res;
1227 list_for_each_entry(dev, &bus->devices, bus_list) {
1228 struct pci_bus *b = dev->subordinate;
1232 switch (dev->class >> 8) {
1233 case PCI_CLASS_BRIDGE_CARDBUS:
1234 pci_bus_size_cardbus(b, realloc_head);
1237 case PCI_CLASS_BRIDGE_PCI:
1239 __pci_bus_size_bridges(b, realloc_head);
1245 if (pci_is_root_bus(bus))
1248 switch (bus->self->class >> 8) {
1249 case PCI_CLASS_BRIDGE_CARDBUS:
1250 /* don't size cardbuses yet. */
1253 case PCI_CLASS_BRIDGE_PCI:
1254 pci_bridge_check_ranges(bus);
1255 if (bus->self->is_hotplug_bridge) {
1256 additional_io_size = pci_hotplug_io_size;
1257 additional_mem_size = pci_hotplug_mem_size;
1261 pbus_size_io(bus, realloc_head ? 0 : additional_io_size,
1262 additional_io_size, realloc_head);
1265 * If there's a 64-bit prefetchable MMIO window, compute
1266 * the size required to put all 64-bit prefetchable
1269 b_res = &bus->self->resource[PCI_BRIDGE_RESOURCES];
1270 mask = IORESOURCE_MEM;
1271 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
1272 if (b_res[2].flags & IORESOURCE_MEM_64) {
1273 prefmask |= IORESOURCE_MEM_64;
1274 ret = pbus_size_mem(bus, prefmask, prefmask,
1276 realloc_head ? 0 : additional_mem_size,
1277 additional_mem_size, realloc_head);
1280 * If successful, all non-prefetchable resources
1281 * and any 32-bit prefetchable resources will go in
1282 * the non-prefetchable window.
1286 type2 = prefmask & ~IORESOURCE_MEM_64;
1287 type3 = prefmask & ~IORESOURCE_PREFETCH;
1292 * If there is no 64-bit prefetchable window, compute the
1293 * size required to put all prefetchable resources in the
1294 * 32-bit prefetchable window (if there is one).
1297 prefmask &= ~IORESOURCE_MEM_64;
1298 ret = pbus_size_mem(bus, prefmask, prefmask,
1300 realloc_head ? 0 : additional_mem_size,
1301 additional_mem_size, realloc_head);
1304 * If successful, only non-prefetchable resources
1305 * will go in the non-prefetchable window.
1310 additional_mem_size += additional_mem_size;
1312 type2 = type3 = IORESOURCE_MEM;
1316 * Compute the size required to put everything else in the
1317 * non-prefetchable window. This includes:
1319 * - all non-prefetchable resources
1320 * - 32-bit prefetchable resources if there's a 64-bit
1321 * prefetchable window or no prefetchable window at all
1322 * - 64-bit prefetchable resources if there's no
1323 * prefetchable window at all
1325 * Note that the strategy in __pci_assign_resource() must
1326 * match that used here. Specifically, we cannot put a
1327 * 32-bit prefetchable resource in a 64-bit prefetchable
1330 pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
1331 realloc_head ? 0 : additional_mem_size,
1332 additional_mem_size, realloc_head);
1337 void pci_bus_size_bridges(struct pci_bus *bus)
1339 __pci_bus_size_bridges(bus, NULL);
1341 EXPORT_SYMBOL(pci_bus_size_bridges);
1343 static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
1346 struct resource *parent_r;
1347 unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
1348 IORESOURCE_PREFETCH;
1350 pci_bus_for_each_resource(b, parent_r, i) {
1354 if ((r->flags & mask) == (parent_r->flags & mask) &&
1355 resource_contains(parent_r, r))
1356 request_resource(parent_r, r);
1361 * Try to assign any resources marked as IORESOURCE_PCI_FIXED, as they
1362 * are skipped by pbus_assign_resources_sorted().
1364 static void pdev_assign_fixed_resources(struct pci_dev *dev)
1368 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
1370 struct resource *r = &dev->resource[i];
1372 if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
1373 !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
1377 while (b && !r->parent) {
1378 assign_fixed_resource_on_bus(b, r);
1384 void __pci_bus_assign_resources(const struct pci_bus *bus,
1385 struct list_head *realloc_head,
1386 struct list_head *fail_head)
1389 struct pci_dev *dev;
1391 pbus_assign_resources_sorted(bus, realloc_head, fail_head);
1393 list_for_each_entry(dev, &bus->devices, bus_list) {
1394 pdev_assign_fixed_resources(dev);
1396 b = dev->subordinate;
1400 __pci_bus_assign_resources(b, realloc_head, fail_head);
1402 switch (dev->class >> 8) {
1403 case PCI_CLASS_BRIDGE_PCI:
1404 if (!pci_is_enabled(dev))
1405 pci_setup_bridge(b);
1408 case PCI_CLASS_BRIDGE_CARDBUS:
1409 pci_setup_cardbus(b);
1413 dev_info(&dev->dev, "not setting up bridge for bus %04x:%02x\n",
1414 pci_domain_nr(b), b->number);
1420 void pci_bus_assign_resources(const struct pci_bus *bus)
1422 __pci_bus_assign_resources(bus, NULL, NULL);
1424 EXPORT_SYMBOL(pci_bus_assign_resources);
1426 static void __pci_bridge_assign_resources(const struct pci_dev *bridge,
1427 struct list_head *add_head,
1428 struct list_head *fail_head)
1432 pdev_assign_resources_sorted((struct pci_dev *)bridge,
1433 add_head, fail_head);
1435 b = bridge->subordinate;
1439 __pci_bus_assign_resources(b, add_head, fail_head);
1441 switch (bridge->class >> 8) {
1442 case PCI_CLASS_BRIDGE_PCI:
1443 pci_setup_bridge(b);
1446 case PCI_CLASS_BRIDGE_CARDBUS:
1447 pci_setup_cardbus(b);
1451 dev_info(&bridge->dev, "not setting up bridge for bus %04x:%02x\n",
1452 pci_domain_nr(b), b->number);
1456 static void pci_bridge_release_resources(struct pci_bus *bus,
1459 struct pci_dev *dev = bus->self;
1461 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1462 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1463 unsigned old_flags = 0;
1464 struct resource *b_res;
1467 b_res = &dev->resource[PCI_BRIDGE_RESOURCES];
1470 * 1. if there is io port assign fail, will release bridge
1472 * 2. if there is non pref mmio assign fail, release bridge
1474 * 3. if there is 64bit pref mmio assign fail, and bridge pref
1475 * is 64bit, release bridge pref mmio.
1476 * 4. if there is pref mmio assign fail, and bridge pref is
1477 * 32bit mmio, release bridge pref mmio
1478 * 5. if there is pref mmio assign fail, and bridge pref is not
1479 * assigned, release bridge nonpref mmio.
1481 if (type & IORESOURCE_IO)
1483 else if (!(type & IORESOURCE_PREFETCH))
1485 else if ((type & IORESOURCE_MEM_64) &&
1486 (b_res[2].flags & IORESOURCE_MEM_64))
1488 else if (!(b_res[2].flags & IORESOURCE_MEM_64) &&
1489 (b_res[2].flags & IORESOURCE_PREFETCH))
1500 * if there are children under that, we should release them
1503 release_child_resources(r);
1504 if (!release_resource(r)) {
1505 type = old_flags = r->flags & type_mask;
1506 dev_printk(KERN_DEBUG, &dev->dev, "resource %d %pR released\n",
1507 PCI_BRIDGE_RESOURCES + idx, r);
1508 /* keep the old size */
1509 r->end = resource_size(r) - 1;
1513 /* avoiding touch the one without PREF */
1514 if (type & IORESOURCE_PREFETCH)
1515 type = IORESOURCE_PREFETCH;
1516 __pci_setup_bridge(bus, type);
1517 /* for next child res under same bridge */
1518 r->flags = old_flags;
1527 * try to release pci bridge resources that is from leaf bridge,
1528 * so we can allocate big new one later
1530 static void pci_bus_release_bridge_resources(struct pci_bus *bus,
1532 enum release_type rel_type)
1534 struct pci_dev *dev;
1535 bool is_leaf_bridge = true;
1537 list_for_each_entry(dev, &bus->devices, bus_list) {
1538 struct pci_bus *b = dev->subordinate;
1542 is_leaf_bridge = false;
1544 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1547 if (rel_type == whole_subtree)
1548 pci_bus_release_bridge_resources(b, type,
1552 if (pci_is_root_bus(bus))
1555 if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1558 if ((rel_type == whole_subtree) || is_leaf_bridge)
1559 pci_bridge_release_resources(bus, type);
1562 static void pci_bus_dump_res(struct pci_bus *bus)
1564 struct resource *res;
1567 pci_bus_for_each_resource(bus, res, i) {
1568 if (!res || !res->end || !res->flags)
1571 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
1575 static void pci_bus_dump_resources(struct pci_bus *bus)
1578 struct pci_dev *dev;
1581 pci_bus_dump_res(bus);
1583 list_for_each_entry(dev, &bus->devices, bus_list) {
1584 b = dev->subordinate;
1588 pci_bus_dump_resources(b);
1592 static int pci_bus_get_depth(struct pci_bus *bus)
1595 struct pci_bus *child_bus;
1597 list_for_each_entry(child_bus, &bus->children, node) {
1600 ret = pci_bus_get_depth(child_bus);
1601 if (ret + 1 > depth)
1609 * -1: undefined, will auto detect later
1610 * 0: disabled by user
1611 * 1: disabled by auto detect
1612 * 2: enabled by user
1613 * 3: enabled by auto detect
1623 static enum enable_type pci_realloc_enable = undefined;
1624 void __init pci_realloc_get_opt(char *str)
1626 if (!strncmp(str, "off", 3))
1627 pci_realloc_enable = user_disabled;
1628 else if (!strncmp(str, "on", 2))
1629 pci_realloc_enable = user_enabled;
1631 static bool pci_realloc_enabled(enum enable_type enable)
1633 return enable >= user_enabled;
1636 #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
1637 static int iov_resources_unassigned(struct pci_dev *dev, void *data)
1640 bool *unassigned = data;
1642 for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
1643 struct resource *r = &dev->resource[i];
1644 struct pci_bus_region region;
1646 /* Not assigned or rejected by kernel? */
1650 pcibios_resource_to_bus(dev->bus, ®ion, r);
1651 if (!region.start) {
1653 return 1; /* return early from pci_walk_bus() */
1660 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1661 enum enable_type enable_local)
1663 bool unassigned = false;
1665 if (enable_local != undefined)
1666 return enable_local;
1668 pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
1670 return auto_enabled;
1672 return enable_local;
1675 static enum enable_type pci_realloc_detect(struct pci_bus *bus,
1676 enum enable_type enable_local)
1678 return enable_local;
1683 * first try will not touch pci bridge res
1684 * second and later try will clear small leaf bridge res
1685 * will stop till to the max depth if can not find good one
1687 void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
1689 LIST_HEAD(realloc_head); /* list of resources that
1690 want additional resources */
1691 struct list_head *add_list = NULL;
1692 int tried_times = 0;
1693 enum release_type rel_type = leaf_only;
1694 LIST_HEAD(fail_head);
1695 struct pci_dev_resource *fail_res;
1696 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1697 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1698 int pci_try_num = 1;
1699 enum enable_type enable_local;
1701 /* don't realloc if asked to do so */
1702 enable_local = pci_realloc_detect(bus, pci_realloc_enable);
1703 if (pci_realloc_enabled(enable_local)) {
1704 int max_depth = pci_bus_get_depth(bus);
1706 pci_try_num = max_depth + 1;
1707 dev_printk(KERN_DEBUG, &bus->dev,
1708 "max bus depth: %d pci_try_num: %d\n",
1709 max_depth, pci_try_num);
1714 * last try will use add_list, otherwise will try good to have as
1715 * must have, so can realloc parent bridge resource
1717 if (tried_times + 1 == pci_try_num)
1718 add_list = &realloc_head;
1719 /* Depth first, calculate sizes and alignments of all
1720 subordinate buses. */
1721 __pci_bus_size_bridges(bus, add_list);
1723 /* Depth last, allocate resources and update the hardware. */
1724 __pci_bus_assign_resources(bus, add_list, &fail_head);
1726 BUG_ON(!list_empty(add_list));
1729 /* any device complain? */
1730 if (list_empty(&fail_head))
1733 if (tried_times >= pci_try_num) {
1734 if (enable_local == undefined)
1735 dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n");
1736 else if (enable_local == auto_enabled)
1737 dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
1739 free_list(&fail_head);
1743 dev_printk(KERN_DEBUG, &bus->dev,
1744 "No. %d try to assign unassigned res\n", tried_times + 1);
1746 /* third times and later will not check if it is leaf */
1747 if ((tried_times + 1) > 2)
1748 rel_type = whole_subtree;
1751 * Try to release leaf bridge's resources that doesn't fit resource of
1752 * child device under that bridge
1754 list_for_each_entry(fail_res, &fail_head, list)
1755 pci_bus_release_bridge_resources(fail_res->dev->bus,
1756 fail_res->flags & type_mask,
1759 /* restore size and flags */
1760 list_for_each_entry(fail_res, &fail_head, list) {
1761 struct resource *res = fail_res->res;
1763 res->start = fail_res->start;
1764 res->end = fail_res->end;
1765 res->flags = fail_res->flags;
1766 if (fail_res->dev->subordinate)
1769 free_list(&fail_head);
1774 /* dump the resource on buses */
1775 pci_bus_dump_resources(bus);
1778 void __init pci_assign_unassigned_resources(void)
1780 struct pci_bus *root_bus;
1782 list_for_each_entry(root_bus, &pci_root_buses, node)
1783 pci_assign_unassigned_root_bus_resources(root_bus);
1786 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1788 struct pci_bus *parent = bridge->subordinate;
1789 LIST_HEAD(add_list); /* list of resources that
1790 want additional resources */
1791 int tried_times = 0;
1792 LIST_HEAD(fail_head);
1793 struct pci_dev_resource *fail_res;
1795 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1796 IORESOURCE_PREFETCH | IORESOURCE_MEM_64;
1799 __pci_bus_size_bridges(parent, &add_list);
1800 __pci_bridge_assign_resources(bridge, &add_list, &fail_head);
1801 BUG_ON(!list_empty(&add_list));
1804 if (list_empty(&fail_head))
1807 if (tried_times >= 2) {
1808 /* still fail, don't need to try more */
1809 free_list(&fail_head);
1813 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1817 * Try to release leaf bridge's resources that doesn't fit resource of
1818 * child device under that bridge
1820 list_for_each_entry(fail_res, &fail_head, list)
1821 pci_bus_release_bridge_resources(fail_res->dev->bus,
1822 fail_res->flags & type_mask,
1825 /* restore size and flags */
1826 list_for_each_entry(fail_res, &fail_head, list) {
1827 struct resource *res = fail_res->res;
1829 res->start = fail_res->start;
1830 res->end = fail_res->end;
1831 res->flags = fail_res->flags;
1832 if (fail_res->dev->subordinate)
1835 free_list(&fail_head);
1840 retval = pci_reenable_device(bridge);
1842 dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
1843 pci_set_master(bridge);
1845 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
1847 void pci_assign_unassigned_bus_resources(struct pci_bus *bus)
1849 struct pci_dev *dev;
1850 LIST_HEAD(add_list); /* list of resources that
1851 want additional resources */
1853 down_read(&pci_bus_sem);
1854 list_for_each_entry(dev, &bus->devices, bus_list)
1855 if (pci_is_bridge(dev) && pci_has_subordinate(dev))
1856 __pci_bus_size_bridges(dev->subordinate,
1858 up_read(&pci_bus_sem);
1859 __pci_bus_assign_resources(bus, &add_list, NULL);
1860 BUG_ON(!list_empty(&add_list));
1862 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bus_resources);