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, 7 insertions, 2 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f1ae2475ffff..b962326e3d95 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -193,7 +193,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                 res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
                 if (type == pci_bar_io) {
                         l &= PCI_BASE_ADDRESS_IO_MASK;
-                        mask = PCI_BASE_ADDRESS_IO_MASK & 0xffff;
+                        mask = PCI_BASE_ADDRESS_IO_MASK & IO_SPACE_LIMIT;
                 } else {
                         l &= PCI_BASE_ADDRESS_MEM_MASK;
                         mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
@@ -237,6 +237,8 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
                         dev_printk(KERN_DEBUG, &dev->dev,
                                 "reg %x 64bit mmio: %pR\n", pos, res);
                 }
+
+                res->flags |= IORESOURCE_MEM_64;
         } else {
                 sz = pci_size(l, sz, mask);
 
@@ -362,7 +364,10 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
                 }
         }
         if (base <= limit) {
-                res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM | IORESOURCE_PREFETCH;
+                res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
+                                         IORESOURCE_MEM | IORESOURCE_PREFETCH;
+                if (res->flags & PCI_PREF_RANGE_TYPE_64)
+                        res->flags |= IORESOURCE_MEM_64;
                 res->start = base;
                 res->end = limit + 0xfffff;
                 dev_printk(KERN_DEBUG, &dev->dev, "bridge %sbit mmio pref: %pR\n",