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path: root/drivers/pci/setup-bus.c
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Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c114
1 files changed, 2 insertions, 112 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 4fe36d2e1049..19b111383f62 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -838,65 +838,11 @@ static void pci_bus_dump_resources(struct pci_bus *bus)
838 } 838 }
839} 839}
840 840
841static int __init pci_bus_get_depth(struct pci_bus *bus)
842{
843 int depth = 0;
844 struct pci_dev *dev;
845
846 list_for_each_entry(dev, &bus->devices, bus_list) {
847 int ret;
848 struct pci_bus *b = dev->subordinate;
849 if (!b)
850 continue;
851
852 ret = pci_bus_get_depth(b);
853 if (ret + 1 > depth)
854 depth = ret + 1;
855 }
856
857 return depth;
858}
859static int __init pci_get_max_depth(void)
860{
861 int depth = 0;
862 struct pci_bus *bus;
863
864 list_for_each_entry(bus, &pci_root_buses, node) {
865 int ret;
866
867 ret = pci_bus_get_depth(bus);
868 if (ret > depth)
869 depth = ret;
870 }
871
872 return depth;
873}
874
875/*
876 * first try will not touch pci bridge res
877 * second and later try will clear small leaf bridge res
878 * will stop till to the max deepth if can not find good one
879 */
880void __init 841void __init
881pci_assign_unassigned_resources(void) 842pci_assign_unassigned_resources(void)
882{ 843{
883 struct pci_bus *bus; 844 struct pci_bus *bus;
884 int tried_times = 0;
885 enum release_type rel_type = leaf_only;
886 struct resource_list_x head, *list;
887 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
888 IORESOURCE_PREFETCH;
889 unsigned long failed_type;
890 int max_depth = pci_get_max_depth();
891 int pci_try_num;
892 845
893 head.next = NULL;
894
895 pci_try_num = max_depth + 1;
896 printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
897 max_depth, pci_try_num);
898
899again:
900 /* Depth first, calculate sizes and alignments of all 846 /* Depth first, calculate sizes and alignments of all
901 subordinate buses. */ 847 subordinate buses. */
902 list_for_each_entry(bus, &pci_root_buses, node) { 848 list_for_each_entry(bus, &pci_root_buses, node) {
@@ -904,65 +850,9 @@ again:
904 } 850 }
905 /* Depth last, allocate resources and update the hardware. */ 851 /* Depth last, allocate resources and update the hardware. */
906 list_for_each_entry(bus, &pci_root_buses, node) { 852 list_for_each_entry(bus, &pci_root_buses, node) {
907 __pci_bus_assign_resources(bus, &head); 853 pci_bus_assign_resources(bus);
908 }
909 tried_times++;
910
911 /* any device complain? */
912 if (!head.next)
913 goto enable_and_dump;
914 failed_type = 0;
915 for (list = head.next; list;) {
916 failed_type |= list->flags;
917 list = list->next;
918 }
919 /*
920 * io port are tight, don't try extra
921 * or if reach the limit, don't want to try more
922 */
923 failed_type &= type_mask;
924 if ((failed_type == IORESOURCE_IO) || (tried_times >= pci_try_num)) {
925 free_failed_list(&head);
926 goto enable_and_dump;
927 }
928
929 printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
930 tried_times + 1);
931
932 /* third times and later will not check if it is leaf */
933 if ((tried_times + 1) > 2)
934 rel_type = whole_subtree;
935
936 /*
937 * Try to release leaf bridge's resources that doesn't fit resource of
938 * child device under that bridge
939 */
940 for (list = head.next; list;) {
941 bus = list->dev->bus;
942 pci_bus_release_bridge_resources(bus, list->flags & type_mask,
943 rel_type);
944 list = list->next;
945 }
946 /* restore size and flags */
947 for (list = head.next; list;) {
948 struct resource *res = list->res;
949
950 res->start = list->start;
951 res->end = list->end;
952 res->flags = list->flags;
953 if (list->dev->subordinate)
954 res->flags = 0;
955
956 list = list->next;
957 }
958 free_failed_list(&head);
959
960 goto again;
961
962enable_and_dump:
963 /* Depth last, update the hardware. */
964 list_for_each_entry(bus, &pci_root_buses, node)
965 pci_enable_bridges(bus); 854 pci_enable_bridges(bus);
855 }
966 856
967 /* dump the resource on buses */ 857 /* dump the resource on buses */
968 list_for_each_entry(bus, &pci_root_buses, node) { 858 list_for_each_entry(bus, &pci_root_buses, node) {