drm/i915: Refactor tests for validity of RING_TAIL

Whilst I like having the assertions clearly visible in the code, they
are quite repetitious! As we find new limits we want to incorporate into
the set of assertions, it make sense to refactor them to a common
routine.

v2: Add a guc holdout.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170327131412.20293-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 39cb84a..b0c3a02 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -326,8 +326,7 @@ static u64 execlists_update_context(struct drm_i915_gem_request *rq)
 		rq->ctx->ppgtt ?: rq->i915->mm.aliasing_ppgtt;
 	u32 *reg_state = ce->lrc_reg_state;
 
-	GEM_BUG_ON(!IS_ALIGNED(rq->tail, 8));
-	GEM_BUG_ON(rq->tail >= rq->ring->size);
+	assert_ring_tail_valid(rq->ring, rq->tail);
 	reg_state[CTX_RING_TAIL+1] = rq->tail;
 
 	/* True 32b PPGTT with dynamic page allocation: update PDP
@@ -1282,8 +1281,7 @@ static void reset_common_ring(struct intel_engine_cs *engine,
 	request->tail =
 		intel_ring_wrap(request->ring,
 				request->wa_tail - WA_TAIL_DWORDS*sizeof(u32));
-	GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
-	GEM_BUG_ON(request->tail >= request->ring->size);
+	assert_ring_tail_valid(request->ring, request->tail);
 }
 
 static int intel_logical_ring_emit_pdps(struct drm_i915_gem_request *req)
@@ -1494,8 +1492,7 @@ static void gen8_emit_breadcrumb(struct drm_i915_gem_request *request, u32 *cs)
 	*cs++ = MI_USER_INTERRUPT;
 	*cs++ = MI_NOOP;
 	request->tail = intel_ring_offset(request, cs);
-	GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
-	GEM_BUG_ON(request->tail >= request->ring->size);
+	assert_ring_tail_valid(request->ring, request->tail);
 
 	gen8_emit_wa_tail(request, cs);
 }
@@ -1523,8 +1520,7 @@ static void gen8_emit_breadcrumb_render(struct drm_i915_gem_request *request,
 	*cs++ = MI_USER_INTERRUPT;
 	*cs++ = MI_NOOP;
 	request->tail = intel_ring_offset(request, cs);
-	GEM_BUG_ON(!IS_ALIGNED(request->tail, 8));
-	GEM_BUG_ON(request->tail >= request->ring->size);
+	assert_ring_tail_valid(request->ring, request->tail);
 
 	gen8_emit_wa_tail(request, cs);
 }