• Keith Packard's avatar
    intel/agp: rewrite GTT on resume · a8c84df9
    Keith Packard authored
    On my Intel chipset (965GM), the GTT is entirely erased across
    suspend/resume.  This patch simply re-plays the current mapping at resume
    time to restore the table.=20
    
    I noticed this once I started relying on persistent GTT mappings across VT
    switch in our GEM work -- the old X server and DRM code carefully unbind
    all memory from the GTT on VT switch, but GEM does not bother.
    
    I placed the list management and rewrite code in the generic layer on the
    assumption that it will be needed on other hardware, but I did not add the
    rewrite call to anything other than the Intel resume function.
    
    Keep a list of current GATT mappings.  At resume time, rewrite them into
    the GATT.  This is needed on Intel (at least) as the entire GATT is
    cleared across suspend/resume.
    
    [akpm@linux-foundation.org: coding-style fixes]
    Signed-off-by: default avatarKeith Packard <keithp@keithp.com>
    Cc: Dave Jones <davej@codemonkey.org.uk>
    Cc: Andi Kleen <andi@firstfloor.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
    a8c84df9
agp_backend.h 3.5 KB