tree 725cd1aebefa75a7b6a04100fd495fcbfe99e0d9
parent a919db9015832d7e4140a38e20ddc1c305c95cb2
author Brad Volkin <bradley.d.volkin@intel.com> 1413487482 -0700
committer Daniel Vetter <daniel.vetter@ffwll.ch> 1415106294 +0100

drm/i915: Abort command parsing for chained batches

libva uses chained batch buffers in a way that the command parser
can't generally handle. Fortunately, libva doesn't need to write
registers from batch buffers in the way that mesa does, so this
patch causes the driver to fall back to non-secure dispatch if
the parser detects a chained batch buffer.

Note: The 2nd hunk to munge the error code of the parser looks a bit
superflous. At least until we have the batch copy code ready and can
run the cmd parser in granting mode. But it isn't since we still need
to let existing libva buffers pass (though not with elevated privs
ofc!).

Testcase: igt/gem_exec_parse/chained-batch
Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
[danvet: Add note - this confused me in review and Brad clarified
things (after a few mails ...).]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>