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>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 32e4b2f72294..786e7b8cece9 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -49,6 +49,8 @@ struct resource_list {
 #define IORESOURCE_SIZEALIGN    0x00020000      /* size indicates alignment */
 #define IORESOURCE_STARTALIGN   0x00040000      /* start field is alignment */
 
+#define IORESOURCE_MEM_64       0x00100000
+
 #define IORESOURCE_EXCLUSIVE    0x08000000      /* Userland may not map this resource */
 #define IORESOURCE_DISABLED     0x10000000
 #define IORESOURCE_UNSET        0x20000000
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 72698d89e767..6dfa47d25ba4 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1097,6 +1097,10 @@ static inline struct pci_dev *pci_get_bus_and_slot(unsigned int bus,
 
 #include <asm/pci.h>
 
+#ifndef PCIBIOS_MAX_MEM_32
+#define PCIBIOS_MAX_MEM_32 (-1)
+#endif
+
 /* these helpers provide future and backwards compatibility
  * for accessing popular PCI BAR info */
 #define pci_resource_start(dev, bar)    ((dev)->resource[(bar)].start)