drm/i915: Remove obsolete engine->gpu_caches_dirty

Space for flushing the GPU cache prior to completing the request is
preallocated and so cannot fail - the GPU caches will always be flushed
along with the completed request. This means we no longer have to track
whether the GPU cache is dirty between batches like we had to with the
outstanding_lazy_seqno.

With the removal of the duplication in the per-backend entry points for
emitting the obsolete lazy flush, we can then further unify the
engine->emit_flush.

v2: Expand a bit on the legacy of gpu_caches_dirty

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-18-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-7-git-send-email-chris@chris-wilson.co.uk

1 files changed, 17 insertions, 55 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e7a7f67..9e4b496 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -688,8 +688,9 @@ static int intel_ring_workarounds_emit(struct drm_i915_gem_request *req)
 	if (w->count == 0)
 		return 0;
 
-	req->engine->gpu_caches_dirty = true;
-	ret = intel_engine_flush_all_caches(req);
+	ret = req->engine->emit_flush(req,
+				      I915_GEM_GPU_DOMAINS,
+				      I915_GEM_GPU_DOMAINS);
 	if (ret)
 		return ret;
 
@@ -706,8 +707,9 @@ static int intel_ring_workarounds_emit(struct drm_i915_gem_request *req)
 
 	intel_ring_advance(ring);
 
-	req->engine->gpu_caches_dirty = true;
-	ret = intel_engine_flush_all_caches(req);
+	ret = req->engine->emit_flush(req,
+				      I915_GEM_GPU_DOMAINS,
+				      I915_GEM_GPU_DOMAINS);
 	if (ret)
 		return ret;
 
@@ -2860,21 +2862,21 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine)
 	if (INTEL_GEN(dev_priv) >= 8) {
 		engine->init_context = intel_rcs_ctx_init;
 		engine->add_request = gen8_render_add_request;
-		engine->flush = gen8_render_ring_flush;
+		engine->emit_flush = gen8_render_ring_flush;
 		if (i915.semaphores)
 			engine->semaphore.signal = gen8_rcs_signal;
 	} else if (INTEL_GEN(dev_priv) >= 6) {
 		engine->init_context = intel_rcs_ctx_init;
-		engine->flush = gen7_render_ring_flush;
+		engine->emit_flush = gen7_render_ring_flush;
 		if (IS_GEN6(dev_priv))
-			engine->flush = gen6_render_ring_flush;
+			engine->emit_flush = gen6_render_ring_flush;
 	} else if (IS_GEN5(dev_priv)) {
-		engine->flush = gen4_render_ring_flush;
+		engine->emit_flush = gen4_render_ring_flush;
 	} else {
 		if (INTEL_GEN(dev_priv) < 4)
-			engine->flush = gen2_render_ring_flush;
+			engine->emit_flush = gen2_render_ring_flush;
 		else
-			engine->flush = gen4_render_ring_flush;
+			engine->emit_flush = gen4_render_ring_flush;
 		engine->irq_enable_mask = I915_USER_INTERRUPT;
 	}
 
@@ -2911,12 +2913,12 @@ int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine)
 		/* gen6 bsd needs a special wa for tail updates */
 		if (IS_GEN6(dev_priv))
 			engine->write_tail = gen6_bsd_ring_write_tail;
-		engine->flush = gen6_bsd_ring_flush;
+		engine->emit_flush = gen6_bsd_ring_flush;
 		if (INTEL_GEN(dev_priv) < 8)
 			engine->irq_enable_mask = GT_BSD_USER_INTERRUPT;
 	} else {
 		engine->mmio_base = BSD_RING_BASE;
-		engine->flush = bsd_ring_flush;
+		engine->emit_flush = bsd_ring_flush;
 		if (IS_GEN5(dev_priv))
 			engine->irq_enable_mask = ILK_BSD_USER_INTERRUPT;
 		else
@@ -2935,7 +2937,7 @@ int intel_init_bsd2_ring_buffer(struct intel_engine_cs *engine)
 
 	intel_ring_default_vfuncs(dev_priv, engine);
 
-	engine->flush = gen6_bsd_ring_flush;
+	engine->emit_flush = gen6_bsd_ring_flush;
 
 	return intel_init_ring_buffer(engine);
 }
@@ -2946,7 +2948,7 @@ int intel_init_blt_ring_buffer(struct intel_engine_cs *engine)
 
 	intel_ring_default_vfuncs(dev_priv, engine);
 
-	engine->flush = gen6_ring_flush;
+	engine->emit_flush = gen6_ring_flush;
 	if (INTEL_GEN(dev_priv) < 8)
 		engine->irq_enable_mask = GT_BLT_USER_INTERRUPT;
 
@@ -2959,7 +2961,7 @@ int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
 
 	intel_ring_default_vfuncs(dev_priv, engine);
 
-	engine->flush = gen6_ring_flush;
+	engine->emit_flush = gen6_ring_flush;
 
 	if (INTEL_GEN(dev_priv) < 8) {
 		engine->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
@@ -2970,46 +2972,6 @@ int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine)
 	return intel_init_ring_buffer(engine);
 }
 
-int
-intel_engine_flush_all_caches(struct drm_i915_gem_request *req)
-{
-	struct intel_engine_cs *engine = req->engine;
-	int ret;
-
-	if (!engine->gpu_caches_dirty)
-		return 0;
-
-	ret = engine->flush(req, 0, I915_GEM_GPU_DOMAINS);
-	if (ret)
-		return ret;
-
-	trace_i915_gem_ring_flush(req, 0, I915_GEM_GPU_DOMAINS);
-
-	engine->gpu_caches_dirty = false;
-	return 0;
-}
-
-int
-intel_engine_invalidate_all_caches(struct drm_i915_gem_request *req)
-{
-	struct intel_engine_cs *engine = req->engine;
-	uint32_t flush_domains;
-	int ret;
-
-	flush_domains = 0;
-	if (engine->gpu_caches_dirty)
-		flush_domains = I915_GEM_GPU_DOMAINS;
-
-	ret = engine->flush(req, I915_GEM_GPU_DOMAINS, flush_domains);
-	if (ret)
-		return ret;
-
-	trace_i915_gem_ring_flush(req, I915_GEM_GPU_DOMAINS, flush_domains);
-
-	engine->gpu_caches_dirty = false;
-	return 0;
-}
-
 void intel_engine_stop(struct intel_engine_cs *engine)
 {
 	int ret;