[Intel-gfx] [PATCH 17/53] drm/i915: Split i915_ppgtt_init_hw() in half - generic and per ring

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

The i915_gem_init_hw() function calls a bunch of smaller initialisation
functions. Multiple of which have generic sections and per ring sections. This
means multiple passes are done over the rings. Each pass writes data to the ring
which floats around in that ring's OLR until some random point in the future
when an add_request() is done by some random other piece of code.

This patch breaks i915_ppgtt_init_hw() in two with the per ring initialisation
now being done in i915_ppgtt_init_ring(). The ring looping is now done at the
top level in i915_gem_init_hw().

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c     |   25 +++++++++++++++++++------
 drivers/gpu/drm/i915/i915_gem_gtt.c |   25 ++++++++++++-------------
 drivers/gpu/drm/i915/i915_gem_gtt.h |    1 +
 3 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 51f719c..9bc60d7 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4844,19 +4844,32 @@ i915_gem_init_hw(struct drm_device *dev)
 	 */
 	init_unused_rings(dev);
 
+	ret = i915_ppgtt_init_hw(dev);
+	if (ret) {
+		DRM_ERROR("PPGTT enable HW failed %d\n", ret);
+		return ret;
+	}
+
+	/* Need to do basic initialisation of all rings first: */
 	for_each_ring(ring, dev_priv, i) {
 		ret = ring->init_hw(ring);
 		if (ret)
 			return ret;
 	}
 
-	for (i = 0; i < NUM_L3_SLICES(dev); i++)
-		i915_gem_l3_remap(&dev_priv->ring[RCS], i);
+	/* Now it is safe to go back round and do everything else: */
+	for_each_ring(ring, dev_priv, i) {
+		if (ring->id == RCS) {
+			for (i = 0; i < NUM_L3_SLICES(dev); i++)
+				i915_gem_l3_remap(ring, i);
+		}
 
-	ret = i915_ppgtt_init_hw(dev);
-	if (ret && ret != -EIO) {
-		DRM_ERROR("PPGTT enable failed %d\n", ret);
-		i915_gem_cleanup_ringbuffer(dev);
+		ret = i915_ppgtt_init_ring(ring);
+		if (ret && ret != -EIO) {
+			DRM_ERROR("PPGTT enable ring #%d failed %d\n", i, ret);
+			i915_gem_cleanup_ringbuffer(dev);
+			return ret;
+		}
 	}
 
 	ret = i915_gem_context_enable(dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e54b2a0..428d2f6 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1206,11 +1206,6 @@ int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
 
 int i915_ppgtt_init_hw(struct drm_device *dev)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	struct intel_engine_cs *ring;
-	struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
-	int i, ret = 0;
-
 	/* In the case of execlists, PPGTT is enabled by the context descriptor
 	 * and the PDPs are contained within the context itself.  We don't
 	 * need to do anything here. */
@@ -1229,16 +1224,20 @@ int i915_ppgtt_init_hw(struct drm_device *dev)
 	else
 		MISSING_CASE(INTEL_INFO(dev)->gen);
 
-	if (ppgtt) {
-		for_each_ring(ring, dev_priv, i) {
-			ret = ppgtt->switch_mm(ppgtt, ring);
-			if (ret != 0)
-				return ret;
-		}
-	}
+	return 0;
+}
 
-	return ret;
+int i915_ppgtt_init_ring(struct intel_engine_cs *ring)
+{
+	struct drm_i915_private *dev_priv = ring->dev->dev_private;
+	struct i915_hw_ppgtt *ppgtt = dev_priv->mm.aliasing_ppgtt;
+
+	if (!ppgtt)
+		return 0;
+
+	return ppgtt->switch_mm(ppgtt, ring);
 }
+
 struct i915_hw_ppgtt *
 i915_ppgtt_create(struct drm_device *dev, struct drm_i915_file_private *fpriv)
 {
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 8f76990..5a6cef9 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -300,6 +300,7 @@ void i915_global_gtt_cleanup(struct drm_device *dev);
 
 int i915_ppgtt_init(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt);
 int i915_ppgtt_init_hw(struct drm_device *dev);
+int i915_ppgtt_init_ring(struct intel_engine_cs *ring);
 void i915_ppgtt_release(struct kref *kref);
 struct i915_hw_ppgtt *i915_ppgtt_create(struct drm_device *dev,
 					struct drm_i915_file_private *fpriv);
-- 
1.7.9.5