• Dave Airlie's avatar
    drm/radeon/kms: fix coherency issues on AGP cards. · df67bed9
    Dave Airlie authored
    When we are evicting from VRAM->RAM we allocate the ttm object,
    but we don't set the caching policy on it before blitting into it.
    This means on AGP we end up blitting into cached pages, and
    the CPU later flushes out on top of them. This was mostly seen as
    font corruption.
    
    The other question is why we don't evict VRAM->GTT in a lot of cases,
    this would save us some cache transitions since a lot of objects
    that are evicted from VRAM will probably end up being pulled back in
    a few operations later, and evicting them to system memory involves
    2 unnecessary cache transitions.
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    df67bed9
ttm_tt.c 13.2 KB