drm/i915: Remove manual breadcumb counting

Now that we know we measure the size of the engine->emit_breadcrumb()
correctly, we can remove the previous manual counting.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190125120005.25191-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_request.c

@@ -650,7 +650,7 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx)
 	 * around inside i915_request_add() there is sufficient space at
 	 * the beginning of the ring as well.
 	 */
-	rq->reserved_space = 2 * engine->emit_breadcrumb_sz * sizeof(u32);
+	rq->reserved_space = 2 * engine->emit_breadcrumb_dw * sizeof(u32);
 
 	/*
 	 * Record the position of the start of the request so that
@@ -901,7 +901,7 @@ void i915_request_add(struct i915_request *request)
 	 * GPU processing the request, we never over-estimate the
 	 * position of the ring's HEAD.
 	 */
-	cs = intel_ring_begin(request, engine->emit_breadcrumb_sz);
+	cs = intel_ring_begin(request, engine->emit_breadcrumb_dw);
 	GEM_BUG_ON(IS_ERR(cs));
 	request->postfix = intel_ring_offset(request, cs);
 

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -611,7 +611,7 @@ struct measure_breadcrumb {
 	u32 cs[1024];
 };
 
-static int measure_breadcrumb_sz(struct intel_engine_cs *engine)
+static int measure_breadcrumb_dw(struct intel_engine_cs *engine)
 {
 	struct measure_breadcrumb *frame;
 	unsigned int dw;
@@ -637,7 +637,6 @@ static int measure_breadcrumb_sz(struct intel_engine_cs *engine)
 	frame->rq.timeline = &frame->timeline;
 
 	dw = engine->emit_breadcrumb(&frame->rq, frame->cs) - frame->cs;
-	GEM_BUG_ON(dw != engine->emit_breadcrumb_sz);
 
 	i915_timeline_fini(&frame->timeline);
 	kfree(frame);
@@ -698,11 +697,11 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
 	if (ret)
 		goto err_breadcrumbs;
 
-	ret = measure_breadcrumb_sz(engine);
+	ret = measure_breadcrumb_dw(engine);
 	if (ret < 0)
 		goto err_status_page;
 
-	engine->emit_breadcrumb_sz = ret;
+	engine->emit_breadcrumb_dw = ret;
 
 	return 0;
 

drivers/gpu/drm/i915/intel_lrc.c

@@ -2075,7 +2075,6 @@ static u32 *gen8_emit_breadcrumb(struct i915_request *request, u32 *cs)
 
 	return gen8_emit_wa_tail(request, cs);
 }
-static const int gen8_emit_breadcrumb_sz = 6 + WA_TAIL_DWORDS;
 
 static u32 *gen8_emit_breadcrumb_rcs(struct i915_request *request, u32 *cs)
 {
@@ -2099,7 +2098,6 @@ static u32 *gen8_emit_breadcrumb_rcs(struct i915_request *request, u32 *cs)
 
 	return gen8_emit_wa_tail(request, cs);
 }
-static const int gen8_emit_breadcrumb_rcs_sz = 8 + WA_TAIL_DWORDS;
 
 static int gen8_init_rcs_context(struct i915_request *rq)
 {
@@ -2192,7 +2190,6 @@ logical_ring_default_vfuncs(struct intel_engine_cs *engine)
 
 	engine->emit_flush = gen8_emit_flush;
 	engine->emit_breadcrumb = gen8_emit_breadcrumb;
-	engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_sz;
 
 	engine->set_default_submission = intel_execlists_set_default_submission;
 
@@ -2298,7 +2295,6 @@ int logical_render_ring_init(struct intel_engine_cs *engine)
 	engine->init_context = gen8_init_rcs_context;
 	engine->emit_flush = gen8_emit_flush_render;
 	engine->emit_breadcrumb = gen8_emit_breadcrumb_rcs;
-	engine->emit_breadcrumb_sz = gen8_emit_breadcrumb_rcs_sz;
 
 	ret = logical_ring_init(engine);
 	if (ret)

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -330,7 +330,6 @@ static u32 *gen6_rcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int gen6_rcs_emit_breadcrumb_sz = 14;
 
 static int
 gen7_render_ring_cs_stall_wa(struct i915_request *rq)
@@ -432,7 +431,6 @@ static u32 *gen7_rcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int gen7_rcs_emit_breadcrumb_sz = 6;
 
 static u32 *gen6_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 {
@@ -446,7 +444,6 @@ static u32 *gen6_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int gen6_xcs_emit_breadcrumb_sz = 4;
 
 #define GEN7_XCS_WA 32
 static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
@@ -475,7 +472,6 @@ static u32 *gen7_xcs_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int gen7_xcs_emit_breadcrumb_sz = 8 + GEN7_XCS_WA * 3;
 #undef GEN7_XCS_WA
 
 static void set_hwstam(struct intel_engine_cs *engine, u32 mask)
@@ -885,7 +881,6 @@ static u32 *i9xx_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int i9xx_emit_breadcrumb_sz = 6;
 
 #define GEN5_WA_STORES 8 /* must be at least 1! */
 static u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
@@ -908,7 +903,6 @@ static u32 *gen5_emit_breadcrumb(struct i915_request *rq, u32 *cs)
 
 	return cs;
 }
-static const int gen5_emit_breadcrumb_sz = GEN5_WA_STORES * 3 + 2;
 #undef GEN5_WA_STORES
 
 static void
@@ -2206,11 +2200,8 @@ static void intel_ring_default_vfuncs(struct drm_i915_private *dev_priv,
 	engine->request_alloc = ring_request_alloc;
 
 	engine->emit_breadcrumb = i9xx_emit_breadcrumb;
-	engine->emit_breadcrumb_sz = i9xx_emit_breadcrumb_sz;
-	if (IS_GEN(dev_priv, 5)) {
+	if (IS_GEN(dev_priv, 5))
 		engine->emit_breadcrumb = gen5_emit_breadcrumb;
-		engine->emit_breadcrumb_sz = gen5_emit_breadcrumb_sz;
-	}
 
 	engine->set_default_submission = i9xx_set_default_submission;
 
@@ -2240,12 +2231,10 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
 		engine->init_context = intel_rcs_ctx_init;
 		engine->emit_flush = gen7_render_ring_flush;
 		engine->emit_breadcrumb = gen7_rcs_emit_breadcrumb;
-		engine->emit_breadcrumb_sz = gen7_rcs_emit_breadcrumb_sz;
 	} else if (IS_GEN(dev_priv, 6)) {
 		engine->init_context = intel_rcs_ctx_init;
 		engine->emit_flush = gen6_render_ring_flush;
 		engine->emit_breadcrumb = gen6_rcs_emit_breadcrumb;
-		engine->emit_breadcrumb_sz = gen6_rcs_emit_breadcrumb_sz;
 	} else if (IS_GEN(dev_priv, 5)) {
 		engine->emit_flush = gen4_render_ring_flush;
 	} else {
@@ -2281,13 +2270,10 @@ int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine)
 		engine->emit_flush = gen6_bsd_ring_flush;
 		engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
 
-		if (IS_GEN(dev_priv, 6)) {
+		if (IS_GEN(dev_priv, 6))
 			engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
-			engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
-		} else {
+		else
 			engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
-			engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
-		}
 	} else {
 		engine->emit_flush = bsd_ring_flush;
 		if (IS_GEN(dev_priv, 5))
@@ -2310,13 +2296,10 @@ int intel_init_blt_ring_buffer(struct intel_engine_cs *engine)
 	engine->emit_flush = gen6_ring_flush;
 	engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
 
-	if (IS_GEN(dev_priv, 6)) {
+	if (IS_GEN(dev_priv, 6))
 		engine->emit_breadcrumb = gen6_xcs_emit_breadcrumb;
-		engine->emit_breadcrumb_sz = gen6_xcs_emit_breadcrumb_sz;
-	} else {
+	else
 		engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
-		engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
-	}
 
 	return intel_init_ring_buffer(engine);
 }
@@ -2335,7 +2318,6 @@ int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
 	engine->irq_disable = hsw_vebox_irq_disable;
 
 	engine->emit_breadcrumb = gen7_xcs_emit_breadcrumb;
-	engine->emit_breadcrumb_sz = gen7_xcs_emit_breadcrumb_sz;
 
 	return intel_init_ring_buffer(engine);
 }

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -471,7 +471,7 @@ struct intel_engine_cs {
 #define I915_DISPATCH_SECURE BIT(0)
 #define I915_DISPATCH_PINNED BIT(1)
 	u32		*(*emit_breadcrumb)(struct i915_request *rq, u32 *cs);
-	int		emit_breadcrumb_sz;
+	int		emit_breadcrumb_dw;
 
 	/* Pass the request to the hardware queue (e.g. directly into
 	 * the legacy ringbuffer or to the end of an execlist).