PCI/x86: don't assume prefetchable ranges are 64bit

We should not assign 64bit ranges to PCI devices that only take 32bit
prefetchable addresses.

Try to set IORESOURCE_MEM_64 in 64bit resource of pci_device/pci_bridge
and make the bus resource only have that bit set when all devices under
it support 64bit prefetchable memory.  Use that flag to allocate
resources from that range.

Reported-by: Yannick <yannick.roehlly@free.fr>
Reviewed-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 97a8194063b5..40af27f31043 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -41,9 +41,14 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
                 void *alignf_data)
 {
         int i, ret = -ENOMEM;
+        resource_size_t max = -1;
 
         type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
 
+        /* don't allocate too high if the pref mem doesn't support 64bit*/
+        if (!(res->flags & IORESOURCE_MEM_64))
+                max = PCIBIOS_MAX_MEM_32;
+
         for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
                 struct resource *r = bus->resource[i];
                 if (!r)
@@ -62,7 +67,7 @@ pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
                 /* Ok, try it out.. */
                 ret = allocate_resource(r, res, size,
                                         r->start ? : min,
-                                        -1, align,
+                                        max, align,
                                         alignf, alignf_data);
                 if (ret == 0)
                         break;