On Tue, Oct 14, 2014 at 01:47:36PM +0100, Chris Wilson wrote: > Previously, this was restricted to only operate on bound objects - to > make pointer access through the GTT to the object coherent with writes > to and from the GPU. A second usecase is drm_intel_bo_wait_rendering() > which at present does not function unless the object also happens to > be bound into the GGTT (on current systems that is becoming increasingly > rare, especially for the typical requests from mesa). A third usecase is > a future patch wishing to extend the coverage of the GTT domain to > include objects not bound into the GGTT but still in its coherent cache > domain. For the latter pair of requests, we need to operate on the > object regardless of its bind state. > > v2: After discussion with Akash, we came to the conclusion that the > get-pages was required in order for accurate domain tracking in the > corner cases (like the shrinker) and also useful for ensuring memory > coherency with earlier cached CPU mmaps in case userspace uses exotic > cache bypass (non-temporal) instructions. > > Cc: Akash Goel <akash.goel@xxxxxxxxx> > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Akash, are you happy with this? Could you bless this with an r-b? -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
