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path: root/drivers/pci/pci.c
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-rw-r--r--drivers/pci/pci.c46
1 files changed, 30 insertions, 16 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 505fbb670d6a..7325d43bf030 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -401,33 +401,40 @@ EXPORT_SYMBOL_GPL(pci_find_ht_capability);
* @res: child resource record for which parent is sought
*
* For given resource region of given device, return the resource
- * region of parent bus the given region is contained in or where
- * it should be allocated from.
+ * region of parent bus the given region is contained in.
*/
struct resource *
pci_find_parent_resource(const struct pci_dev *dev, struct resource *res)
{
const struct pci_bus *bus = dev->bus;
+ struct resource *r;
int i;
- struct resource *best = NULL, *r;
pci_bus_for_each_resource(bus, r, i) {
if (!r)
continue;
- if (res->start && !(res->start >= r->start && res->end <= r->end))
- continue; /* Not contained */
- if ((res->flags ^ r->flags) & (IORESOURCE_IO | IORESOURCE_MEM))
- continue; /* Wrong type */
- if (!((res->flags ^ r->flags) & IORESOURCE_PREFETCH))
- return r; /* Exact match */
- /* We can't insert a non-prefetch resource inside a prefetchable parent .. */
- if (r->flags & IORESOURCE_PREFETCH)
- continue;
- /* .. but we can put a prefetchable resource inside a non-prefetchable one */
- if (!best)
- best = r;
+ if (res->start && resource_contains(r, res)) {
+
+ /*
+ * If the window is prefetchable but the BAR is
+ * not, the allocator made a mistake.
+ */
+ if (r->flags & IORESOURCE_PREFETCH &&
+ !(res->flags & IORESOURCE_PREFETCH))
+ return NULL;
+
+ /*
+ * If we're below a transparent bridge, there may
+ * be both a positively-decoded aperture and a
+ * subtractively-decoded region that contain the BAR.
+ * We want the positively-decoded one, so this depends
+ * on pci_bus_for_each_resource() giving us those
+ * first.
+ */
+ return r;
+ }
}
- return best;
+ return NULL;
}
/**
@@ -1178,6 +1185,11 @@ int pci_load_and_free_saved_state(struct pci_dev *dev,
}
EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
+int __weak pcibios_enable_device(struct pci_dev *dev, int bars)
+{
+ return pci_enable_resources(dev, bars);
+}
+
static int do_pci_enable_device(struct pci_dev *dev, int bars)
{
int err;
@@ -4262,6 +4274,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
"Rounding up size of resource #%d to %#llx.\n",
i, (unsigned long long)size);
}
+ r->flags |= IORESOURCE_UNSET;
r->end = size - 1;
r->start = 0;
}
@@ -4275,6 +4288,7 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev)
r = &dev->resource[i];
if (!(r->flags & IORESOURCE_MEM))
continue;
+ r->flags |= IORESOURCE_UNSET;
r->end = resource_size(r) - 1;
r->start = 0;
}