[PATCH 16/43] drm/i915/bdw: GEN-specific logical ring init

[Thomas Daniel <thomas.daniel@intel.com>]

From: Oscar Mateo <oscar.mateo@intel.com>

Logical rings do not need most of the initialization their
legacy ringbuffer counterparts do: we just need the pipe
control object for the render ring, enable Execlists on the
hardware and a few workarounds.

v2: Squash with: "drm/i915: Extract pipe control fini & make
init outside accesible".

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c        |   54 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_ringbuffer.c |   34 +++++++++++--------
 drivers/gpu/drm/i915/intel_ringbuffer.h |    3 ++
 3 files changed, 78 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 05b7069..7c8b75e 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -106,6 +106,49 @@ void intel_logical_ring_stop(struct intel_engine_cs *ring)
 	/* TODO */
 }
 
+static int gen8_init_common_ring(struct intel_engine_cs *ring)
+{
+	struct drm_device *dev = ring->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	I915_WRITE(RING_MODE_GEN7(ring),
+		_MASKED_BIT_DISABLE(GFX_REPLAY_MODE) |
+		_MASKED_BIT_ENABLE(GFX_RUN_LIST_ENABLE));
+	POSTING_READ(RING_MODE_GEN7(ring));
+	DRM_DEBUG_DRIVER("Execlists enabled for %s\n", ring->name);
+
+	memset(&ring->hangcheck, 0, sizeof(ring->hangcheck));
+
+	return 0;
+}
+
+static int gen8_init_render_ring(struct intel_engine_cs *ring)
+{
+	struct drm_device *dev = ring->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	int ret;
+
+	ret = gen8_init_common_ring(ring);
+	if (ret)
+		return ret;
+
+	/* We need to disable the AsyncFlip performance optimisations in order
+	 * to use MI_WAIT_FOR_EVENT within the CS. It should already be
+	 * programmed to '1' on all products.
+	 *
+	 * WaDisableAsyncFlipPerfMode:snb,ivb,hsw,vlv,bdw,chv
+	 */
+	I915_WRITE(MI_MODE, _MASKED_BIT_ENABLE(ASYNC_FLIP_PERF_DISABLE));
+
+	ret = intel_init_pipe_control(ring);
+	if (ret)
+		return ret;
+
+	I915_WRITE(INSTPM, _MASKED_BIT_ENABLE(INSTPM_FORCE_ORDERING));
+
+	return ret;
+}
+
 void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
 {
 	if (!intel_ring_initialized(ring))
@@ -176,6 +219,9 @@ static int logical_render_ring_init(struct drm_device *dev)
 	ring->irq_enable_mask =
 		GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT;
 
+	ring->init = gen8_init_render_ring;
+	ring->cleanup = intel_fini_pipe_control;
+
 	return logical_ring_init(dev, ring);
 }
 
@@ -190,6 +236,8 @@ static int logical_bsd_ring_init(struct drm_device *dev)
 	ring->irq_enable_mask =
 		GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
 
+	ring->init = gen8_init_common_ring;
+
 	return logical_ring_init(dev, ring);
 }
 
@@ -204,6 +252,8 @@ static int logical_bsd2_ring_init(struct drm_device *dev)
 	ring->irq_enable_mask =
 		GT_RENDER_USER_INTERRUPT << GEN8_VCS2_IRQ_SHIFT;
 
+	ring->init = gen8_init_common_ring;
+
 	return logical_ring_init(dev, ring);
 }
 
@@ -218,6 +268,8 @@ static int logical_blt_ring_init(struct drm_device *dev)
 	ring->irq_enable_mask =
 		GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
 
+	ring->init = gen8_init_common_ring;
+
 	return logical_ring_init(dev, ring);
 }
 
@@ -232,6 +284,8 @@ static int logical_vebox_ring_init(struct drm_device *dev)
 	ring->irq_enable_mask =
 		GT_RENDER_USER_INTERRUPT << GEN8_VECS_IRQ_SHIFT;
 
+	ring->init = gen8_init_common_ring;
+
 	return logical_ring_init(dev, ring);
 }
 
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 20eb1a4..ca45c58 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -573,8 +573,25 @@ out:
 	return ret;
 }
 
-static int
-init_pipe_control(struct intel_engine_cs *ring)
+void
+intel_fini_pipe_control(struct intel_engine_cs *ring)
+{
+	struct drm_device *dev = ring->dev;
+
+	if (ring->scratch.obj == NULL)
+		return;
+
+	if (INTEL_INFO(dev)->gen >= 5) {
+		kunmap(sg_page(ring->scratch.obj->pages->sgl));
+		i915_gem_object_ggtt_unpin(ring->scratch.obj);
+	}
+
+	drm_gem_object_unreference(&ring->scratch.obj->base);
+	ring->scratch.obj = NULL;
+}
+
+int
+intel_init_pipe_control(struct intel_engine_cs *ring)
 {
 	int ret;
 
@@ -649,7 +666,7 @@ static int init_render_ring(struct intel_engine_cs *ring)
 			   _MASKED_BIT_ENABLE(GFX_REPLAY_MODE));
 
 	if (INTEL_INFO(dev)->gen >= 5) {
-		ret = init_pipe_control(ring);
+		ret = intel_init_pipe_control(ring);
 		if (ret)
 			return ret;
 	}
@@ -684,16 +701,7 @@ static void render_ring_cleanup(struct intel_engine_cs *ring)
 		dev_priv->semaphore_obj = NULL;
 	}
 
-	if (ring->scratch.obj == NULL)
-		return;
-
-	if (INTEL_INFO(dev)->gen >= 5) {
-		kunmap(sg_page(ring->scratch.obj->pages->sgl));
-		i915_gem_object_ggtt_unpin(ring->scratch.obj);
-	}
-
-	drm_gem_object_unreference(&ring->scratch.obj->base);
-	ring->scratch.obj = NULL;
+	intel_fini_pipe_control(ring);
 }
 
 static int gen8_rcs_signal(struct intel_engine_cs *signaller,
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 7203ee2..c135334 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -380,6 +380,9 @@ void intel_ring_init_seqno(struct intel_engine_cs *ring, u32 seqno);
 int intel_ring_flush_all_caches(struct intel_engine_cs *ring);
 int intel_ring_invalidate_all_caches(struct intel_engine_cs *ring);
 
+void intel_fini_pipe_control(struct intel_engine_cs *ring);
+int intel_init_pipe_control(struct intel_engine_cs *ring);
+
 int intel_init_render_ring_buffer(struct drm_device *dev);
 int intel_init_bsd_ring_buffer(struct drm_device *dev);
 int intel_init_bsd2_ring_buffer(struct drm_device *dev);
-- 
1.7.9.5