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authorBjorn Helgaas <bjorn.helgaas@hp.com>2010-11-10 10:26:07 -0700
committerJesse Barnes <jbarnes@virtuousgeek.org>2010-11-12 09:16:08 -0800
commit82e3e767c21fef2b1b38868e20eb4e470a1e38e3 (patch)
treeb1d25853445115cc580fafc4b1d664bc3219c16b
parent97c145f7c87453cec90e91238fba5fe2c1561b32 (diff)
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PCI: fix pci_bus_alloc_resource() hang, prefer positive decode
When a PCI bus has two resources with the same start/end, e.g., pci_bus 0000:04: resource 2 [mem 0xd0000000-0xd7ffffff pref] pci_bus 0000:04: resource 7 [mem 0xd0000000-0xd7ffffff] the previous pci_bus_find_resource_prev() implementation would alternate between them forever: pci_bus_find_resource_prev(... [mem 0xd0000000-0xd7ffffff pref]) returns [mem 0xd0000000-0xd7ffffff] pci_bus_find_resource_prev(... [mem 0xd0000000-0xd7ffffff]) returns [mem 0xd0000000-0xd7ffffff pref] pci_bus_find_resource_prev(... [mem 0xd0000000-0xd7ffffff pref]) returns [mem 0xd0000000-0xd7ffffff] ... This happened because there was no ordering between two resources with the same start and end. A resource that had the same start and end as the cursor, but was not itself the cursor, was considered to be before the cursor. This patch fixes the hang by making a fixed ordering between any two resources. In addition, it tries to allocate from positively decoded regions before using any subtractively decoded resources. This means we will use a positive decode region before a subtractive decode one, even if it means using a smaller address. Reference: https://bugzilla.kernel.org/show_bug.cgi?id=22062 Reported-by: Borislav Petkov <bp@amd64.org> Tested-by: Borislav Petkov <bp@amd64.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/pci/bus.c70
1 files changed, 49 insertions, 21 deletions
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 5624db8c9ad..003170ea2e3 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -64,17 +64,57 @@ void pci_bus_remove_resources(struct pci_bus *bus)
}
}
+static bool pci_bus_resource_better(struct resource *res1, bool pos1,
+ struct resource *res2, bool pos2)
+{
+ /* If exactly one is positive decode, always prefer that one */
+ if (pos1 != pos2)
+ return pos1 ? true : false;
+
+ /* Prefer the one that contains the highest address */
+ if (res1->end != res2->end)
+ return (res1->end > res2->end) ? true : false;
+
+ /* Otherwise, prefer the one with highest "center of gravity" */
+ if (res1->start != res2->start)
+ return (res1->start > res2->start) ? true : false;
+
+ /* Otherwise, choose one arbitrarily (but consistently) */
+ return (res1 > res2) ? true : false;
+}
+
+static bool pci_bus_resource_positive(struct pci_bus *bus, struct resource *res)
+{
+ struct pci_bus_resource *bus_res;
+
+ /*
+ * This relies on the fact that pci_bus.resource[] refers to P2P or
+ * CardBus bridge base/limit registers, which are always positively
+ * decoded. The pci_bus.resources list contains host bridge or
+ * subtractively decoded resources.
+ */
+ list_for_each_entry(bus_res, &bus->resources, list) {
+ if (bus_res->res == res)
+ return (bus_res->flags & PCI_SUBTRACTIVE_DECODE) ?
+ false : true;
+ }
+ return true;
+}
+
/*
- * Find the highest-address bus resource below the cursor "res". If the
- * cursor is NULL, return the highest resource.
+ * Find the next-best bus resource after the cursor "res". If the cursor is
+ * NULL, return the best resource. "Best" means that we prefer positive
+ * decode regions over subtractive decode, then those at higher addresses.
*/
static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus,
unsigned int type,
struct resource *res)
{
+ bool res_pos, r_pos, prev_pos = false;
struct resource *r, *prev = NULL;
int i;
+ res_pos = pci_bus_resource_positive(bus, res);
pci_bus_for_each_resource(bus, r, i) {
if (!r)
continue;
@@ -82,26 +122,14 @@ static struct resource *pci_bus_find_resource_prev(struct pci_bus *bus,
if ((r->flags & IORESOURCE_TYPE_BITS) != type)
continue;
- /* If this resource is at or past the cursor, skip it */
- if (res) {
- if (r == res)
- continue;
- if (r->end > res->end)
- continue;
- if (r->end == res->end && r->start > res->start)
- continue;
+ r_pos = pci_bus_resource_positive(bus, r);
+ if (!res || pci_bus_resource_better(res, res_pos, r, r_pos)) {
+ if (!prev || pci_bus_resource_better(r, r_pos,
+ prev, prev_pos)) {
+ prev = r;
+ prev_pos = r_pos;
+ }
}
-
- if (!prev)
- prev = r;
-
- /*
- * A small resource is higher than a large one that ends at
- * the same address.
- */
- if (r->end > prev->end ||
- (r->end == prev->end && r->start > prev->start))
- prev = r;
}
return prev;