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author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2006-12-08 01:14:33 -0500 |
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committer | Paul Mackerras <paulus@samba.org> | 2006-12-08 01:21:06 -0500 |
commit | 396a1a5832ae28ce2c4150f98827873cbef554f5 (patch) | |
tree | 26d72bdf3765184f64e6231e7962152272584401 /arch/powerpc/kernel/sysfs.c | |
parent | f09b5ce0184da6a83bac7fafda4e624629272b37 (diff) |
[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>
Diffstat (limited to 'arch/powerpc/kernel/sysfs.c')
0 files changed, 0 insertions, 0 deletions