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

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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 <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
This commit is contained in:
Benjamin Herrenschmidt 2006-12-08 17:14:33 +11:00 • committed by Paul Mackerras
commit 396a1a5832
5 changed files with 101 additions and 39 deletions
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4
include/asm-powerpc/pci-bridge.h
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@ -31,12 +31,12 @@ struct pci_controller {
int last_busno;
void __iomem *io_base_virt;
unsigned long io_base_phys;
resource_size_t io_base_phys;
/* Some machines 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;
unsigned long pci_io_size;
struct pci_ops *ops;