• Thomas Hellstrom's avatar
    [AGPGART] Remove unnecessary flushes when inserting and removing pages. · 5aa80c72
    Thomas Hellstrom authored
    This patch is to speed up flipping of pages in and out of the AGP aperture as
    needed by the new drm memory manager.
    
    A number of global cache flushes are removed as well as some PCI posting flushes.
    The following guidelines have been used:
    
    1) Memory that is only mapped uncached and that has been subject to a global
    cache flush after the mapping was changed to uncached does not need any more
    cache flushes. Neither before binding to the aperture nor after unbinding.
    
    2) Only do one PCI posting flush after a sequence of writes modifying page
    entries in the GATT.
    Signed-off-by: default avatarThomas Hellstrom <thomas@tungstengraphics.com>
    Signed-off-by: default avatarDave Jones <davej@redhat.com>
    5aa80c72
generic.c 32.6 KB