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drm/i915: Poison the request before emitting commands

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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 <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170423170619.7156-2-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
This commit is contained in:
Chris Wilson 2017-04-23 18:06:17 +01:00
parent e6ba9992de
commit 0100186386
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -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);