2 * drivers/pci/setup-bus.c
4 * Extruded from code written by
5 * Dave Rusling (david.rusling@reo.mts.dec.com)
6 * David Mosberger (davidm@cs.arizona.edu)
7 * David Miller (davem@redhat.com)
9 * Support routines for initializing a PCI subsystem.
13 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
14 * PCI-PCI bridges cleanup, sorted resource allocation.
15 * Feb 2002, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
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 struct resource_list_x {
31 struct resource_list_x *next;
34 resource_size_t start;
36 resource_size_t add_size;
37 resource_size_t min_align;
41 #define free_list(type, head) do { \
42 struct type *list, *tmp; \
43 for (list = (head)->next; list;) { \
48 (head)->next = NULL; \
51 int pci_realloc_enable = 0;
52 #define pci_realloc_enabled() pci_realloc_enable
53 void pci_realloc(void)
55 pci_realloc_enable = 1;
59 * add_to_list() - add a new resource tracker to the list
60 * @head: Head of the list
61 * @dev: device corresponding to which the resource
63 * @res: The resource to be tracked
64 * @add_size: additional size to be optionally added
67 static void add_to_list(struct resource_list_x *head,
68 struct pci_dev *dev, struct resource *res,
69 resource_size_t add_size, resource_size_t min_align)
71 struct resource_list_x *list = head;
72 struct resource_list_x *ln = list->next;
73 struct resource_list_x *tmp;
75 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
77 pr_warning("add_to_list: kmalloc() failed!\n");
84 tmp->start = res->start;
86 tmp->flags = res->flags;
87 tmp->add_size = add_size;
88 tmp->min_align = min_align;
92 static void add_to_failed_list(struct resource_list_x *head,
93 struct pci_dev *dev, struct resource *res)
95 add_to_list(head, dev, res,
100 static void __dev_sort_resources(struct pci_dev *dev,
101 struct resource_list *head)
103 u16 class = dev->class >> 8;
105 /* Don't touch classless devices or host bridges or ioapics. */
106 if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
109 /* Don't touch ioapic devices already enabled by firmware */
110 if (class == PCI_CLASS_SYSTEM_PIC) {
112 pci_read_config_word(dev, PCI_COMMAND, &command);
113 if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
117 pdev_sort_resources(dev, head);
120 static inline void reset_resource(struct resource *res)
128 * reassign_resources_sorted() - satisfy any additional resource requests
130 * @realloc_head : head of the list tracking requests requiring additional
132 * @head : head of the list tracking requests with allocated
135 * Walk through each element of the realloc_head and try to procure
136 * additional resources for the element, provided the element
137 * is in the head list.
139 static void reassign_resources_sorted(struct resource_list_x *realloc_head,
140 struct resource_list *head)
142 struct resource *res;
143 struct resource_list_x *list, *tmp, *prev;
144 struct resource_list *hlist;
145 resource_size_t add_size;
149 for (list = realloc_head->next; list;) {
151 /* skip resource that has been reset */
155 /* skip this resource if not found in head list */
156 for (hlist = head->next; hlist && hlist->res != res;
157 hlist = hlist->next);
158 if (!hlist) { /* just skip */
164 idx = res - &list->dev->resource[0];
165 add_size=list->add_size;
166 if (!resource_size(res)) {
167 res->start = list->start;
168 res->end = res->start + add_size - 1;
169 if(pci_assign_resource(list->dev, idx))
172 resource_size_t align = list->min_align;
173 res->flags |= list->flags & (IORESOURCE_STARTALIGN|IORESOURCE_SIZEALIGN);
174 if (pci_reassign_resource(list->dev, idx, add_size, align))
175 dev_printk(KERN_DEBUG, &list->dev->dev, "failed to add optional resources res=%pR\n",
180 prev->next = list = list->next;
186 * assign_requested_resources_sorted() - satisfy resource requests
188 * @head : head of the list tracking requests for resources
189 * @failed_list : head of the list tracking requests that could
192 * Satisfy resource requests of each element in the list. Add
193 * requests that could not satisfied to the failed_list.
195 static void assign_requested_resources_sorted(struct resource_list *head,
196 struct resource_list_x *fail_head)
198 struct resource *res;
199 struct resource_list *list;
202 for (list = head->next; list; list = list->next) {
204 idx = res - &list->dev->resource[0];
205 if (resource_size(res) && pci_assign_resource(list->dev, idx)) {
206 if (fail_head && !pci_is_root_bus(list->dev->bus)) {
208 * if the failed res is for ROM BAR, and it will
209 * be enabled later, don't add it to the list
211 if (!((idx == PCI_ROM_RESOURCE) &&
212 (!(res->flags & IORESOURCE_ROM_ENABLE))))
213 add_to_failed_list(fail_head, list->dev, res);
220 static void __assign_resources_sorted(struct resource_list *head,
221 struct resource_list_x *realloc_head,
222 struct resource_list_x *fail_head)
224 /* Satisfy the must-have resource requests */
225 assign_requested_resources_sorted(head, fail_head);
227 /* Try to satisfy any additional optional resource
230 reassign_resources_sorted(realloc_head, head);
231 free_list(resource_list, head);
234 static void pdev_assign_resources_sorted(struct pci_dev *dev,
235 struct resource_list_x *fail_head)
237 struct resource_list head;
240 __dev_sort_resources(dev, &head);
241 __assign_resources_sorted(&head, NULL, fail_head);
245 static void pbus_assign_resources_sorted(const struct pci_bus *bus,
246 struct resource_list_x *realloc_head,
247 struct resource_list_x *fail_head)
250 struct resource_list head;
253 list_for_each_entry(dev, &bus->devices, bus_list)
254 __dev_sort_resources(dev, &head);
256 __assign_resources_sorted(&head, realloc_head, fail_head);
259 void pci_setup_cardbus(struct pci_bus *bus)
261 struct pci_dev *bridge = bus->self;
262 struct resource *res;
263 struct pci_bus_region region;
265 dev_info(&bridge->dev, "CardBus bridge to [bus %02x-%02x]\n",
266 bus->secondary, bus->subordinate);
268 res = bus->resource[0];
269 pcibios_resource_to_bus(bridge, ®ion, res);
270 if (res->flags & IORESOURCE_IO) {
272 * The IO resource is allocated a range twice as large as it
273 * would normally need. This allows us to set both IO regs.
275 dev_info(&bridge->dev, " bridge window %pR\n", res);
276 pci_write_config_dword(bridge, PCI_CB_IO_BASE_0,
278 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_0,
282 res = bus->resource[1];
283 pcibios_resource_to_bus(bridge, ®ion, res);
284 if (res->flags & IORESOURCE_IO) {
285 dev_info(&bridge->dev, " bridge window %pR\n", res);
286 pci_write_config_dword(bridge, PCI_CB_IO_BASE_1,
288 pci_write_config_dword(bridge, PCI_CB_IO_LIMIT_1,
292 res = bus->resource[2];
293 pcibios_resource_to_bus(bridge, ®ion, res);
294 if (res->flags & IORESOURCE_MEM) {
295 dev_info(&bridge->dev, " bridge window %pR\n", res);
296 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_0,
298 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_0,
302 res = bus->resource[3];
303 pcibios_resource_to_bus(bridge, ®ion, res);
304 if (res->flags & IORESOURCE_MEM) {
305 dev_info(&bridge->dev, " bridge window %pR\n", res);
306 pci_write_config_dword(bridge, PCI_CB_MEMORY_BASE_1,
308 pci_write_config_dword(bridge, PCI_CB_MEMORY_LIMIT_1,
312 EXPORT_SYMBOL(pci_setup_cardbus);
314 /* Initialize bridges with base/limit values we have collected.
315 PCI-to-PCI Bridge Architecture Specification rev. 1.1 (1998)
316 requires that if there is no I/O ports or memory behind the
317 bridge, corresponding range must be turned off by writing base
318 value greater than limit to the bridge's base/limit registers.
320 Note: care must be taken when updating I/O base/limit registers
321 of bridges which support 32-bit I/O. This update requires two
322 config space writes, so it's quite possible that an I/O window of
323 the bridge will have some undesirable address (e.g. 0) after the
324 first write. Ditto 64-bit prefetchable MMIO. */
325 static void pci_setup_bridge_io(struct pci_bus *bus)
327 struct pci_dev *bridge = bus->self;
328 struct resource *res;
329 struct pci_bus_region region;
332 /* Set up the top and bottom of the PCI I/O segment for this bus. */
333 res = bus->resource[0];
334 pcibios_resource_to_bus(bridge, ®ion, res);
335 if (res->flags & IORESOURCE_IO) {
336 pci_read_config_dword(bridge, PCI_IO_BASE, &l);
338 l |= (region.start >> 8) & 0x00f0;
339 l |= region.end & 0xf000;
340 /* Set up upper 16 bits of I/O base/limit. */
341 io_upper16 = (region.end & 0xffff0000) | (region.start >> 16);
342 dev_info(&bridge->dev, " bridge window %pR\n", res);
344 /* Clear upper 16 bits of I/O base/limit. */
348 /* Temporarily disable the I/O range before updating PCI_IO_BASE. */
349 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, 0x0000ffff);
350 /* Update lower 16 bits of I/O base/limit. */
351 pci_write_config_dword(bridge, PCI_IO_BASE, l);
352 /* Update upper 16 bits of I/O base/limit. */
353 pci_write_config_dword(bridge, PCI_IO_BASE_UPPER16, io_upper16);
356 static void pci_setup_bridge_mmio(struct pci_bus *bus)
358 struct pci_dev *bridge = bus->self;
359 struct resource *res;
360 struct pci_bus_region region;
363 /* Set up the top and bottom of the PCI Memory segment for this bus. */
364 res = bus->resource[1];
365 pcibios_resource_to_bus(bridge, ®ion, res);
366 if (res->flags & IORESOURCE_MEM) {
367 l = (region.start >> 16) & 0xfff0;
368 l |= region.end & 0xfff00000;
369 dev_info(&bridge->dev, " bridge window %pR\n", res);
373 pci_write_config_dword(bridge, PCI_MEMORY_BASE, l);
376 static void pci_setup_bridge_mmio_pref(struct pci_bus *bus)
378 struct pci_dev *bridge = bus->self;
379 struct resource *res;
380 struct pci_bus_region region;
383 /* Clear out the upper 32 bits of PREF limit.
384 If PCI_PREF_BASE_UPPER32 was non-zero, this temporarily
385 disables PREF range, which is ok. */
386 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, 0);
388 /* Set up PREF base/limit. */
390 res = bus->resource[2];
391 pcibios_resource_to_bus(bridge, ®ion, res);
392 if (res->flags & IORESOURCE_PREFETCH) {
393 l = (region.start >> 16) & 0xfff0;
394 l |= region.end & 0xfff00000;
395 if (res->flags & IORESOURCE_MEM_64) {
396 bu = upper_32_bits(region.start);
397 lu = upper_32_bits(region.end);
399 dev_info(&bridge->dev, " bridge window %pR\n", res);
403 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, l);
405 /* Set the upper 32 bits of PREF base & limit. */
406 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, bu);
407 pci_write_config_dword(bridge, PCI_PREF_LIMIT_UPPER32, lu);
410 static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
412 struct pci_dev *bridge = bus->self;
414 dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
415 bus->secondary, bus->subordinate);
417 if (type & IORESOURCE_IO)
418 pci_setup_bridge_io(bus);
420 if (type & IORESOURCE_MEM)
421 pci_setup_bridge_mmio(bus);
423 if (type & IORESOURCE_PREFETCH)
424 pci_setup_bridge_mmio_pref(bus);
426 pci_write_config_word(bridge, PCI_BRIDGE_CONTROL, bus->bridge_ctl);
429 void pci_setup_bridge(struct pci_bus *bus)
431 unsigned long type = IORESOURCE_IO | IORESOURCE_MEM |
434 __pci_setup_bridge(bus, type);
437 /* Check whether the bridge supports optional I/O and
438 prefetchable memory ranges. If not, the respective
439 base/limit registers must be read-only and read as 0. */
440 static void pci_bridge_check_ranges(struct pci_bus *bus)
444 struct pci_dev *bridge = bus->self;
445 struct resource *b_res;
447 b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
448 b_res[1].flags |= IORESOURCE_MEM;
450 pci_read_config_word(bridge, PCI_IO_BASE, &io);
452 pci_write_config_word(bridge, PCI_IO_BASE, 0xf0f0);
453 pci_read_config_word(bridge, PCI_IO_BASE, &io);
454 pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
457 b_res[0].flags |= IORESOURCE_IO;
458 /* DECchip 21050 pass 2 errata: the bridge may miss an address
459 disconnect boundary by one PCI data phase.
460 Workaround: do not use prefetching on this device. */
461 if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
463 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
465 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
467 pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
468 pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
471 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH;
472 if ((pmem & PCI_PREF_RANGE_TYPE_MASK) ==
473 PCI_PREF_RANGE_TYPE_64) {
474 b_res[2].flags |= IORESOURCE_MEM_64;
475 b_res[2].flags |= PCI_PREF_RANGE_TYPE_64;
479 /* double check if bridge does support 64 bit pref */
480 if (b_res[2].flags & IORESOURCE_MEM_64) {
481 u32 mem_base_hi, tmp;
482 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
484 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
486 pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
488 b_res[2].flags &= ~IORESOURCE_MEM_64;
489 pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
494 /* Helper function for sizing routines: find first available
495 bus resource of a given type. Note: we intentionally skip
496 the bus resources which have already been assigned (that is,
497 have non-NULL parent resource). */
498 static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned long type)
502 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
505 pci_bus_for_each_resource(bus, r, i) {
506 if (r == &ioport_resource || r == &iomem_resource)
508 if (r && (r->flags & type_mask) == type && !r->parent)
514 static resource_size_t calculate_iosize(resource_size_t size,
515 resource_size_t min_size,
516 resource_size_t size1,
517 resource_size_t old_size,
518 resource_size_t align)
524 /* To be fixed in 2.5: we should have sort of HAVE_ISA
525 flag in the struct pci_bus. */
526 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
527 size = (size & 0xff) + ((size & ~0xffUL) << 2);
529 size = ALIGN(size + size1, align);
535 static resource_size_t calculate_memsize(resource_size_t size,
536 resource_size_t min_size,
537 resource_size_t size1,
538 resource_size_t old_size,
539 resource_size_t align)
547 size = ALIGN(size + size1, align);
551 static resource_size_t get_res_add_size(struct resource_list_x *realloc_head,
552 struct resource *res)
554 struct resource_list_x *list;
556 /* check if it is in realloc_head list */
557 for (list = realloc_head->next; list && list->res != res;
560 return list->add_size;
566 * pbus_size_io() - size the io window of a given bus
569 * @min_size : the minimum io window that must to be allocated
570 * @add_size : additional optional io window
571 * @realloc_head : track the additional io window on this list
573 * Sizing the IO windows of the PCI-PCI bridge is trivial,
574 * since these windows have 4K granularity and the IO ranges
575 * of non-bridge PCI devices are limited to 256 bytes.
576 * We must be careful with the ISA aliasing though.
578 static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size,
579 resource_size_t add_size, struct resource_list_x *realloc_head)
582 struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
583 unsigned long size = 0, size0 = 0, size1 = 0, res_size;
584 resource_size_t children_add_size = 0;
589 list_for_each_entry(dev, &bus->devices, bus_list) {
592 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
593 struct resource *r = &dev->resource[i];
594 unsigned long r_size;
596 if (r->parent || !(r->flags & IORESOURCE_IO))
598 r_size = resource_size(r);
601 /* Might be re-aligned for ISA */
607 children_add_size += get_res_add_size(realloc_head, r);
610 size0 = calculate_iosize(size, min_size, size1,
611 resource_size(b_res), 4096);
612 if (children_add_size > add_size)
613 add_size = children_add_size;
614 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
615 calculate_iosize(size, min_size+add_size, size1,
616 resource_size(b_res), 4096);
617 res_size = pci_reserve_size_io(bus);
618 if (size0 < res_size)
619 size0 = ALIGN(res_size, 4096);
620 if (size1 < res_size)
621 size1 = ALIGN(res_size, 4096);
622 if (!size0 && !size1) {
623 if (b_res->start || b_res->end)
624 dev_info(&bus->self->dev, "disabling bridge window "
625 "%pR to [bus %02x-%02x] (unused)\n", b_res,
626 bus->secondary, bus->subordinate);
630 /* Alignment of the IO window is always 4K */
632 b_res->end = b_res->start + size0 - 1;
633 b_res->flags |= IORESOURCE_STARTALIGN;
634 if (size1 > size0 && realloc_head)
635 add_to_list(realloc_head, bus->self, b_res, size1-size0, 4096);
639 * pbus_size_mem() - size the memory window of a given bus
642 * @min_size : the minimum memory window that must to be allocated
643 * @add_size : additional optional memory window
644 * @realloc_head : track the additional memory window on this list
646 * Calculate the size of the bus and minimal alignment which
647 * guarantees that all child resources fit in this size.
649 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
650 unsigned long type, resource_size_t min_size,
651 resource_size_t add_size,
652 struct resource_list_x *realloc_head)
655 resource_size_t min_align, align, size, size0, size1;
656 resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
657 int order, max_order;
658 struct resource *b_res = find_free_bus_resource(bus, type);
659 unsigned int mem64_mask = 0;
660 resource_size_t children_add_size = 0;
665 memset(aligns, 0, sizeof(aligns));
669 mem64_mask = b_res->flags & IORESOURCE_MEM_64;
670 b_res->flags &= ~IORESOURCE_MEM_64;
672 list_for_each_entry(dev, &bus->devices, bus_list) {
675 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
676 struct resource *r = &dev->resource[i];
677 resource_size_t r_size;
679 if (r->parent || (r->flags & mask) != type)
681 r_size = resource_size(r);
682 #ifdef CONFIG_PCI_IOV
683 /* put SRIOV requested res to the optional list */
684 if (realloc_head && i >= PCI_IOV_RESOURCES &&
685 i <= PCI_IOV_RESOURCE_END) {
686 r->end = r->start - 1;
687 add_to_list(realloc_head, dev, r, r_size, 0/* dont' care */);
688 children_add_size += r_size;
692 /* For bridges size != alignment */
693 align = pci_resource_alignment(dev, r);
694 order = __ffs(align) - 20;
696 dev_warn(&dev->dev, "disabling BAR %d: %pR "
697 "(bad alignment %#llx)\n", i, r,
698 (unsigned long long) align);
705 /* Exclude ranges with size > align from
706 calculation of the alignment. */
708 aligns[order] += align;
709 if (order > max_order)
711 mem64_mask &= r->flags & IORESOURCE_MEM_64;
714 children_add_size += get_res_add_size(realloc_head, r);
719 for (order = 0; order <= max_order; order++) {
720 resource_size_t align1 = 1;
722 align1 <<= (order + 20);
726 else if (ALIGN(align + min_align, min_align) < align1)
727 min_align = align1 >> 1;
728 align += aligns[order];
730 size = max(size, (resource_size_t)pci_reserve_size_mem(bus));
731 size0 = calculate_memsize(size, min_size, 0, resource_size(b_res), min_align);
732 if (children_add_size > add_size)
733 add_size = children_add_size;
734 size1 = (!realloc_head || (realloc_head && !add_size)) ? size0 :
735 calculate_memsize(size, min_size+add_size, 0,
736 resource_size(b_res), min_align);
737 if (!size0 && !size1) {
738 if (b_res->start || b_res->end)
739 dev_info(&bus->self->dev, "disabling bridge window "
740 "%pR to [bus %02x-%02x] (unused)\n", b_res,
741 bus->secondary, bus->subordinate);
745 b_res->start = min_align;
746 b_res->end = size0 + min_align - 1;
747 b_res->flags |= IORESOURCE_STARTALIGN | mem64_mask;
748 if (size1 > size0 && realloc_head)
749 add_to_list(realloc_head, bus->self, b_res, size1-size0, min_align);
753 unsigned long pci_cardbus_resource_alignment(struct resource *res)
755 if (res->flags & IORESOURCE_IO)
756 return pci_cardbus_io_size;
757 if (res->flags & IORESOURCE_MEM)
758 return pci_cardbus_mem_size;
762 static void pci_bus_size_cardbus(struct pci_bus *bus,
763 struct resource_list_x *realloc_head)
765 struct pci_dev *bridge = bus->self;
766 struct resource *b_res = &bridge->resource[PCI_BRIDGE_RESOURCES];
770 * Reserve some resources for CardBus. We reserve
771 * a fixed amount of bus space for CardBus bridges.
774 b_res[0].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
776 add_to_list(realloc_head, bridge, b_res, pci_cardbus_io_size, 0 /* dont care */);
779 b_res[1].flags |= IORESOURCE_IO | IORESOURCE_SIZEALIGN;
781 add_to_list(realloc_head, bridge, b_res+1, pci_cardbus_io_size, 0 /* dont care */);
784 * Check whether prefetchable memory is supported
787 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
788 if (!(ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0)) {
789 ctrl |= PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
790 pci_write_config_word(bridge, PCI_CB_BRIDGE_CONTROL, ctrl);
791 pci_read_config_word(bridge, PCI_CB_BRIDGE_CONTROL, &ctrl);
795 * If we have prefetchable memory support, allocate
796 * two regions. Otherwise, allocate one region of
799 if (ctrl & PCI_CB_BRIDGE_CTL_PREFETCH_MEM0) {
801 b_res[2].flags |= IORESOURCE_MEM | IORESOURCE_PREFETCH | IORESOURCE_SIZEALIGN;
803 add_to_list(realloc_head, bridge, b_res+2, pci_cardbus_mem_size, 0 /* dont care */);
806 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
808 add_to_list(realloc_head, bridge, b_res+3, pci_cardbus_mem_size, 0 /* dont care */);
811 b_res[3].flags |= IORESOURCE_MEM | IORESOURCE_SIZEALIGN;
813 add_to_list(realloc_head, bridge, b_res+3, pci_cardbus_mem_size * 2, 0 /* dont care */);
816 /* set the size of the resource to zero, so that the resource does not
817 * get assigned during required-resource allocation cycle but gets assigned
818 * during the optional-resource allocation cycle.
820 b_res[0].start = b_res[1].start = b_res[2].start = b_res[3].start = 1;
821 b_res[0].end = b_res[1].end = b_res[2].end = b_res[3].end = 0;
824 void __ref __pci_bus_size_bridges(struct pci_bus *bus,
825 struct resource_list_x *realloc_head)
828 unsigned long mask, prefmask;
829 resource_size_t additional_mem_size = 0, additional_io_size = 0;
831 list_for_each_entry(dev, &bus->devices, bus_list) {
832 struct pci_bus *b = dev->subordinate;
836 switch (dev->class >> 8) {
837 case PCI_CLASS_BRIDGE_CARDBUS:
838 pci_bus_size_cardbus(b, realloc_head);
841 case PCI_CLASS_BRIDGE_PCI:
843 __pci_bus_size_bridges(b, realloc_head);
852 switch (bus->self->class >> 8) {
853 case PCI_CLASS_BRIDGE_CARDBUS:
854 /* don't size cardbuses yet. */
857 case PCI_CLASS_BRIDGE_PCI:
858 pci_bridge_check_ranges(bus);
859 if (bus->self->is_hotplug_bridge) {
860 additional_io_size = pci_hotplug_io_size;
861 additional_mem_size = pci_hotplug_mem_size;
867 pbus_size_io(bus, 0, additional_io_size, realloc_head);
868 /* If the bridge supports prefetchable range, size it
869 separately. If it doesn't, or its prefetchable window
870 has already been allocated by arch code, try
871 non-prefetchable range for both types of PCI memory
873 mask = IORESOURCE_MEM;
874 prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
875 if (pbus_size_mem(bus, prefmask, prefmask, 0, additional_mem_size, realloc_head))
876 mask = prefmask; /* Success, size non-prefetch only. */
878 additional_mem_size += additional_mem_size;
879 pbus_size_mem(bus, mask, IORESOURCE_MEM, 0, additional_mem_size, realloc_head);
884 void __ref pci_bus_size_bridges(struct pci_bus *bus)
886 __pci_bus_size_bridges(bus, NULL);
888 EXPORT_SYMBOL(pci_bus_size_bridges);
890 static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,
891 struct resource_list_x *realloc_head,
892 struct resource_list_x *fail_head)
897 pbus_assign_resources_sorted(bus, realloc_head, fail_head);
899 list_for_each_entry(dev, &bus->devices, bus_list) {
900 b = dev->subordinate;
904 __pci_bus_assign_resources(b, realloc_head, fail_head);
906 switch (dev->class >> 8) {
907 case PCI_CLASS_BRIDGE_PCI:
908 if (!pci_is_enabled(dev))
912 case PCI_CLASS_BRIDGE_CARDBUS:
913 pci_setup_cardbus(b);
917 dev_info(&dev->dev, "not setting up bridge for bus "
918 "%04x:%02x\n", pci_domain_nr(b), b->number);
924 void __ref pci_bus_assign_resources(const struct pci_bus *bus)
926 __pci_bus_assign_resources(bus, NULL, NULL);
928 EXPORT_SYMBOL(pci_bus_assign_resources);
930 static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
931 struct resource_list_x *fail_head)
935 pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
937 b = bridge->subordinate;
941 __pci_bus_assign_resources(b, NULL, fail_head);
943 switch (bridge->class >> 8) {
944 case PCI_CLASS_BRIDGE_PCI:
948 case PCI_CLASS_BRIDGE_CARDBUS:
949 pci_setup_cardbus(b);
953 dev_info(&bridge->dev, "not setting up bridge for bus "
954 "%04x:%02x\n", pci_domain_nr(b), b->number);
958 static void pci_bridge_release_resources(struct pci_bus *bus,
962 bool changed = false;
965 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
969 for (idx = PCI_BRIDGE_RESOURCES; idx <= PCI_BRIDGE_RESOURCE_END;
971 r = &dev->resource[idx];
972 if ((r->flags & type_mask) != type)
977 * if there are children under that, we should release them
980 release_child_resources(r);
981 if (!release_resource(r)) {
982 dev_printk(KERN_DEBUG, &dev->dev,
983 "resource %d %pR released\n", idx, r);
984 /* keep the old size */
985 r->end = resource_size(r) - 1;
993 /* avoiding touch the one without PREF */
994 if (type & IORESOURCE_PREFETCH)
995 type = IORESOURCE_PREFETCH;
996 __pci_setup_bridge(bus, type);
1005 * try to release pci bridge resources that is from leaf bridge,
1006 * so we can allocate big new one later
1008 static void __ref pci_bus_release_bridge_resources(struct pci_bus *bus,
1010 enum release_type rel_type)
1012 struct pci_dev *dev;
1013 bool is_leaf_bridge = true;
1015 list_for_each_entry(dev, &bus->devices, bus_list) {
1016 struct pci_bus *b = dev->subordinate;
1020 is_leaf_bridge = false;
1022 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1025 if (rel_type == whole_subtree)
1026 pci_bus_release_bridge_resources(b, type,
1030 if (pci_is_root_bus(bus))
1033 if ((bus->self->class >> 8) != PCI_CLASS_BRIDGE_PCI)
1036 if ((rel_type == whole_subtree) || is_leaf_bridge)
1037 pci_bridge_release_resources(bus, type);
1040 static void pci_bus_dump_res(struct pci_bus *bus)
1042 struct resource *res;
1045 pci_bus_for_each_resource(bus, res, i) {
1046 if (!res || !res->end || !res->flags)
1049 dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
1053 static void pci_bus_dump_resources(struct pci_bus *bus)
1056 struct pci_dev *dev;
1059 pci_bus_dump_res(bus);
1061 list_for_each_entry(dev, &bus->devices, bus_list) {
1062 b = dev->subordinate;
1066 pci_bus_dump_resources(b);
1070 static int __init pci_bus_get_depth(struct pci_bus *bus)
1073 struct pci_dev *dev;
1075 list_for_each_entry(dev, &bus->devices, bus_list) {
1077 struct pci_bus *b = dev->subordinate;
1081 ret = pci_bus_get_depth(b);
1082 if (ret + 1 > depth)
1088 static int __init pci_get_max_depth(void)
1091 struct pci_bus *bus;
1093 list_for_each_entry(bus, &pci_root_buses, node) {
1096 ret = pci_bus_get_depth(bus);
1106 * first try will not touch pci bridge res
1107 * second and later try will clear small leaf bridge res
1108 * will stop till to the max deepth if can not find good one
1111 pci_assign_unassigned_resources(void)
1113 struct pci_bus *bus;
1114 struct resource_list_x realloc_list; /* list of resources that
1115 want additional resources */
1116 int tried_times = 0;
1117 enum release_type rel_type = leaf_only;
1118 struct resource_list_x head, *list;
1119 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1120 IORESOURCE_PREFETCH;
1121 unsigned long failed_type;
1122 int max_depth = pci_get_max_depth();
1127 realloc_list.next = NULL;
1129 pci_try_num = max_depth + 1;
1130 printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
1131 max_depth, pci_try_num);
1134 /* Depth first, calculate sizes and alignments of all
1135 subordinate buses. */
1136 list_for_each_entry(bus, &pci_root_buses, node)
1137 __pci_bus_size_bridges(bus, &realloc_list);
1139 /* Depth last, allocate resources and update the hardware. */
1140 list_for_each_entry(bus, &pci_root_buses, node)
1141 __pci_bus_assign_resources(bus, &realloc_list, &head);
1142 BUG_ON(realloc_list.next);
1145 /* any device complain? */
1147 goto enable_and_dump;
1149 /* don't realloc if asked to do so */
1150 if (!pci_realloc_enabled()) {
1151 free_list(resource_list_x, &head);
1152 goto enable_and_dump;
1156 for (list = head.next; list;) {
1157 failed_type |= list->flags;
1161 * io port are tight, don't try extra
1162 * or if reach the limit, don't want to try more
1164 failed_type &= type_mask;
1165 if ((failed_type == IORESOURCE_IO) || (tried_times >= pci_try_num)) {
1166 free_list(resource_list_x, &head);
1167 goto enable_and_dump;
1170 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1173 /* third times and later will not check if it is leaf */
1174 if ((tried_times + 1) > 2)
1175 rel_type = whole_subtree;
1178 * Try to release leaf bridge's resources that doesn't fit resource of
1179 * child device under that bridge
1181 for (list = head.next; list;) {
1182 bus = list->dev->bus;
1183 pci_bus_release_bridge_resources(bus, list->flags & type_mask,
1187 /* restore size and flags */
1188 for (list = head.next; list;) {
1189 struct resource *res = list->res;
1191 res->start = list->start;
1192 res->end = list->end;
1193 res->flags = list->flags;
1194 if (list->dev->subordinate)
1199 free_list(resource_list_x, &head);
1204 /* Depth last, update the hardware. */
1205 list_for_each_entry(bus, &pci_root_buses, node)
1206 pci_enable_bridges(bus);
1208 /* dump the resource on buses */
1209 list_for_each_entry(bus, &pci_root_buses, node)
1210 pci_bus_dump_resources(bus);
1213 void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
1215 struct pci_bus *parent = bridge->subordinate;
1216 int tried_times = 0;
1217 struct resource_list_x head, *list;
1219 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
1220 IORESOURCE_PREFETCH;
1225 pci_bus_size_bridges(parent);
1226 __pci_bridge_assign_resources(bridge, &head);
1233 if (tried_times >= 2) {
1234 /* still fail, don't need to try more */
1235 free_list(resource_list_x, &head);
1239 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
1243 * Try to release leaf bridge's resources that doesn't fit resource of
1244 * child device under that bridge
1246 for (list = head.next; list;) {
1247 struct pci_bus *bus = list->dev->bus;
1248 unsigned long flags = list->flags;
1250 pci_bus_release_bridge_resources(bus, flags & type_mask,
1254 /* restore size and flags */
1255 for (list = head.next; list;) {
1256 struct resource *res = list->res;
1258 res->start = list->start;
1259 res->end = list->end;
1260 res->flags = list->flags;
1261 if (list->dev->subordinate)
1266 free_list(resource_list_x, &head);
1271 retval = pci_reenable_device(bridge);
1272 pci_set_master(bridge);
1273 pci_enable_bridges(parent);
1275 EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);