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ia64/PCI: Clip bridge windows to fit in upstream windows 

Every PCI-PCI bridge window should fit inside an upstream bridge window
because orphaned address space is unreachable from the primary side of the
upstream bridge.  If we inherit invalid bridge windows that overlap an
upstream window from firmware, clip them to fit and update the bridge
accordingly.

[bhelgaas: changelog]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491
Reported-by: Marek Kordik <kordikmarek@gmail.com>
Fixes: 5b28541552 ("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources")
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Tony Luck <tony.luck@intel.com>
CC: Fenghua Yu <fenghua.yu@intel.com>
CC: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
CC: linux-ia64@vger.kernel.org
This commit is contained in:
Yinghai Lu 2015-01-15 16:21:50 -06:00 committed by Bjorn Helgaas
parent b0c568de32
commit ce821ef033
1 changed files with 26 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
arch/ia64/pci/pci.c
View File

@ -487,45 +487,39 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
return 0;
}
static int is_valid_resource(struct pci_dev *dev, int idx)
{
unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
struct resource *devr = &dev->resource[idx], *busr;
if (!dev->bus)
return 0;
pci_bus_for_each_resource(dev->bus, busr, i) {
if (!busr || ((busr->flags ^ devr->flags) & type_mask))
continue;
if ((devr->start) && (devr->start >= busr->start) &&
(devr->end <= busr->end))
return 1;
}
return 0;
}
static void pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
{
int i;
for (i = start; i < limit; i++) {
if (!dev->resource[i].flags)
continue;
if ((is_valid_resource(dev, i)))
pci_claim_resource(dev, i);
}
}
void pcibios_fixup_device_resources(struct pci_dev *dev)
{
pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
int idx;
if (!dev->bus)
return;
for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
struct resource *r = &dev->resource[idx];
if (!r->flags || r->parent || !r->start)
continue;
pci_claim_resource(dev, idx);
}
}
EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
{
pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
int idx;
if (!dev->bus)
return;
for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
struct resource *r = &dev->resource[idx];
if (!r->flags || r->parent || !r->start)
continue;
pci_claim_bridge_resource(dev, idx);
}
}
/*