• Benjamin Herrenschmidt's avatar
    drm: Make drm_local_map use a resource_size_t offset · 41c2e75e
    Benjamin Herrenschmidt authored
    This changes drm_local_map to use a resource_size for its "offset"
    member instead of an unsigned long, thus allowing 32-bit machines
    with a >32-bit physical address space to be able to store there
    their register or framebuffer addresses when those are above 4G,
    such as when using a PCI video card on a recent AMCC 440 SoC.
    
    This patch isn't as "trivial" as it sounds: A few functions needed
    to have some unsigned long/int changed to resource_size_t and a few
    printk's had to be adjusted.
    
    But also, because userspace isn't capable of passing such offsets,
    I had to modify drm_find_matching_map() to ignore the offset passed
    in for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
    
    If we ever support multiple _DRM_FRAMEBUFFER or _DRM_REGISTERS maps
    for a given device, we might have to change that trick, but I don't
    think that happens on any current driver.
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    Signed-off-by: default avatarDave Airlie <airlied@linux.ie>
    41c2e75e
mga_dma.c 29.5 KB