drm/i915: clear the shadow batch
authorMatthew Auld <matthew.auld@intel.com>
Thu, 24 Dec 2020 15:13:57 +0000 (15:13 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Thu, 24 Dec 2020 15:25:41 +0000 (15:25 +0000)
commiteeb52ee6c4a429ec301faf1dc48988744960786e
treec8b5ccae39fa88534abadbca9677fef81fa12e11
parent177b7a52a16a0f9b9075119308ed3d8d5a8640cc
drm/i915: clear the shadow batch

The shadow batch is an internal object, which doesn't have any page
clearing, and since the batch_len can be smaller than the object, we
should take care to clear it.

Testcase: igt/gen9_exec_parse/shadow-peek
Fixes: 4f7af1948abc ("drm/i915: Support ro ppgtt mapped cmdparser shadow buffers")
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201224151358.401345-1-matthew.auld@intel.com
Cc: stable@vger.kernel.org
drivers/gpu/drm/i915/i915_cmd_parser.c