From: Chris Wilson Date: Sun, 23 Apr 2017 17:06:17 +0000 (+0100) Subject: drm/i915: Poison the request before emitting commands X-Git-Tag: v4.14-rc1~484^2~32^2~160 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=010018638659fbe8332c470e94750daf6ef4ab14;p=platform%2Fkernel%2Flinux-rpi.git drm/i915: Poison the request before emitting commands If we poison the request before we emit commands, it should be easier to spot when we execute an uninitialised request. References: https://bugs.freedesktop.org/show_bug.cgi?id=100144 Signed-off-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/20170423170619.7156-2-chris@chris-wilson.co.uk Reviewed-by: Mika Kuoppala --- diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 227dfcf..6836efb 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -1694,6 +1694,7 @@ u32 *intel_ring_begin(struct drm_i915_gem_request *req, int num_dwords) GEM_BUG_ON(ring->emit > ring->size - bytes); cs = ring->vaddr + ring->emit; + GEM_DEBUG_EXEC(memset(cs, POISON_INUSE, bytes)); ring->emit += bytes; ring->space -= bytes; GEM_BUG_ON(ring->space < 0);