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drm/i915: Enforce that CS packets are qword aligned

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We require the caller to ensure that the packets they wish to emit into
the CS ring are qword aligned (i.e. have an even number of dwords).
Double check this.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170721161101.1618-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2017-07-21 17:11:01 +01:00 committed by Daniel Vetter
parent eadc2e51fd
commit 6492ca79c8
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -1712,6 +1712,9 @@ u32 *intel_ring_begin(struct drm_i915_gem_request *req,
unsigned int total_bytes;
u32 *cs;
/* Packets must be qword aligned. */
GEM_BUG_ON(num_dwords & 1);
total_bytes = bytes + req->reserved_space;
GEM_BUG_ON(total_bytes > ring->effective_size);