[POWERPC] Fix mmap of PCI resource with hack for X

The powerpc version of pci_resource_to_user() and associated hooks
used by /proc/bus/pci and /sys/bus/pci mmap have been broken for some
time on machines that don't have a 1:1 mapping of devices (basically
on non-PowerMacs) and have PCI devices above 32 bits.

This attempts to fix it as well as possible.

The rule is supposed to be that pci_resource_to_user() always converts
the resources back into a BAR values since that's what the /proc
interface was supposed to deal with. However, for X to work on
platforms where PCI MMIO is not mapped 1:1, it became a habit of
platforms like powerpc to pass "fixed up" values there since X expects
to be able to use values from /proc/bus/pci/devices as offsets to mmap
of /dev/mem...

So we keep that contraption here, causing also /sys/*/resource to
expose fully absolute MMIO addresses instead of BAR values, which is
ugly, but should still work as long as those are only used to calculate
alignment within a page.

X is still broken when built 32 bits on machines where PCI MMIO can be
above 32-bit space unfortunately.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/asm-ppc/pci-bridge.h b/include/asm-ppc/pci-bridge.h
index 6c955d0c1ef..4d35b844bc5 100644
--- a/include/asm-ppc/pci-bridge.h
+++ b/include/asm-ppc/pci-bridge.h
@@ -20,8 +20,8 @@ extern unsigned long pci_bus_mem_base_phys(unsigned int bus);
 extern struct pci_controller* pcibios_alloc_controller(void);
 
 /* Helper function for setting up resources */
-extern void pci_init_resource(struct resource *res, unsigned long start,
-			      unsigned long end, int flags, char *name);
+extern void pci_init_resource(struct resource *res, resource_size_t start,
+			      resource_size_t end, int flags, char *name);
 
 /* Get the PCI host controller for a bus */
 extern struct pci_controller* pci_bus_to_hose(int bus);
@@ -50,12 +50,12 @@ struct pci_controller {
 	int bus_offset;
 
 	void __iomem *io_base_virt;
-	unsigned long io_base_phys;
+	resource_size_t io_base_phys;
 
 	/* Some machines (PReP) have a non 1:1 mapping of
 	 * the PCI memory space in the CPU bus space
 	 */
-	unsigned long pci_mem_offset;
+	resource_size_t pci_mem_offset;
 
 	struct pci_ops *ops;
 	volatile unsigned int __iomem *cfg_addr;