[Intel-gfx] [PATCH 32/53] drm/i915/bdw: GEN-specific logical ring emit batchbuffer start

[oscar.mateo at intel.com]

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

Dispatch_execbuffer's evil twin.

Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/intel_lrc.c        | 29 +++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_ringbuffer.h |  3 +++
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 0fab3b9..27fde8d 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -480,6 +480,30 @@ static int gen8_init_render_ring(struct intel_engine_cs *ring)
 	return ret;
 }
 
+static int gen8_emit_bb_start(struct intel_engine_cs *ring,
+			      struct intel_context *ctx,
+			      u64 offset, unsigned flags)
+{
+	struct drm_i915_private *dev_priv = ring->dev->dev_private;
+	bool ppgtt = dev_priv->mm.aliasing_ppgtt != NULL &&
+		!(flags & I915_DISPATCH_SECURE);
+	struct intel_ringbuffer *ringbuf = logical_ringbuf_get(ring, ctx);
+	int ret;
+
+	ret = intel_logical_ring_begin(ring, ctx, 4);
+	if (ret)
+		return ret;
+
+	/* FIXME(BDW): Address space and security selectors. */
+	intel_logical_ring_emit(ringbuf, MI_BATCH_BUFFER_START_GEN8 | (ppgtt<<8));
+	intel_logical_ring_emit(ringbuf, lower_32_bits(offset));
+	intel_logical_ring_emit(ringbuf, upper_32_bits(offset));
+	intel_logical_ring_emit(ringbuf, MI_NOOP);
+	intel_logical_ring_advance(ringbuf);
+
+	return 0;
+}
+
 static bool gen8_logical_ring_get_irq(struct intel_engine_cs *ring)
 {
 	struct drm_device *dev = ring->dev;
@@ -746,6 +770,7 @@ static int logical_render_ring_init(struct drm_device *dev)
 	ring->emit_flush = gen8_emit_flush_render;
 	ring->irq_get = gen8_logical_ring_get_irq;
 	ring->irq_put = gen8_logical_ring_put_irq;
+	ring->emit_bb_start = gen8_emit_bb_start;
 
 	return logical_ring_init(dev, ring);
 }
@@ -771,6 +796,7 @@ static int logical_bsd_ring_init(struct drm_device *dev)
 	ring->emit_flush = gen8_emit_flush;
 	ring->irq_get = gen8_logical_ring_get_irq;
 	ring->irq_put = gen8_logical_ring_put_irq;
+	ring->emit_bb_start = gen8_emit_bb_start;
 
 	return logical_ring_init(dev, ring);
 }
@@ -796,6 +822,7 @@ static int logical_bsd2_ring_init(struct drm_device *dev)
 	ring->emit_flush = gen8_emit_flush;
 	ring->irq_get = gen8_logical_ring_get_irq;
 	ring->irq_put = gen8_logical_ring_put_irq;
+	ring->emit_bb_start = gen8_emit_bb_start;
 
 	return logical_ring_init(dev, ring);
 }
@@ -821,6 +848,7 @@ static int logical_blt_ring_init(struct drm_device *dev)
 	ring->emit_flush = gen8_emit_flush;
 	ring->irq_get = gen8_logical_ring_get_irq;
 	ring->irq_put = gen8_logical_ring_put_irq;
+	ring->emit_bb_start = gen8_emit_bb_start;
 
 	return logical_ring_init(dev, ring);
 }
@@ -846,6 +874,7 @@ static int logical_vebox_ring_init(struct drm_device *dev)
 	ring->emit_flush = gen8_emit_flush;
 	ring->irq_get = gen8_logical_ring_get_irq;
 	ring->irq_put = gen8_logical_ring_put_irq;
+	ring->emit_bb_start = gen8_emit_bb_start;
 
 	return logical_ring_init(dev, ring);
 }
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index abaf3ca..ca02b5d 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -165,6 +165,9 @@ struct  intel_engine_cs {
 				       struct intel_context *ctx,
 				       u32 invalidate_domains,
 				       u32 flush_domains);
+	int		(*emit_bb_start)(struct intel_engine_cs *ring,
+					 struct intel_context *ctx,
+					 u64 offset, unsigned flags);
 
 	/**
 	 * List of objects currently involved in rendering from the
-- 
1.9.0