[PATCH 11/12] drm/i915: Embed PPGTT into the context

[Ben Widawsky <ben@bwidawsk.net>]

The aliasing ppgtt is just the ppgtt for the default context.

The obvious downside is until we actually do ppgtt switches, this wastes
a bit of memory. ie. by the end of the series, it's a don't care. The
other downside is PPGTT can't work without contexts, which *should* have
already been the case except for debugging scenarios. (Note the does
break the potential to easily use contexts an GEN5)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_drv.h     |  2 ++
 drivers/gpu/drm/i915/i915_gem.c     | 14 ++++++++------
 drivers/gpu/drm/i915/i915_gem_gtt.c |  1 -
 3 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 9f984cf..c123df2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -461,6 +461,8 @@ struct i915_hw_context {
 	struct drm_i915_file_private *file_priv;
 	struct intel_ring_buffer *ring;
 	struct drm_i915_gem_object *obj;
+
+	struct i915_hw_ppgtt ppgtt;
 };
 
 enum no_fbc_reason {
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 24f3aef..cb9fcfb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4070,17 +4070,19 @@ int i915_gem_init(struct drm_device *dev)
 
 	if (intel_enable_ppgtt(dev) && HAS_ALIASING_PPGTT(dev)) {
 		struct i915_hw_ppgtt *ppgtt;
-		ppgtt = kzalloc(sizeof(*ppgtt), GFP_KERNEL);
-		if (!ppgtt)
-			goto ggtt_only;
-
 
 		i915_gem_setup_global_gtt(dev, 0, dev_priv->gtt.mappable_end,
 					  dev_priv->gtt.total, false);
 		i915_gem_context_init(dev);
+		if (dev_priv->hw_contexts_disabled) {
+			drm_mm_takedown(&dev_priv->mm.gtt_space);
+			goto ggtt_only;
+		}
+
+		ppgtt = &dev_priv->ring[RCS].default_context->ppgtt;
+
 		ret = i915_gem_ppgtt_init(dev, ppgtt);
-		if (ret)  {
-			kfree(ppgtt);
+		if (ret) {
 			drm_mm_takedown(&dev_priv->mm.gtt_space);
 			goto ggtt_only;
 		}
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 0598c6d..c260e92 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -232,7 +232,6 @@ static void gen6_ppgtt_cleanup(struct i915_hw_ppgtt *ppgtt)
 	for (i = 0; i < ppgtt->num_pd_entries; i++)
 		__free_page(ppgtt->pt_pages[i]);
 	kfree(ppgtt->pt_pages);
-	kfree(ppgtt);
 }
 
 static int gen6_ppgtt_init(struct i915_hw_ppgtt *ppgtt)
-- 
1.8.2.1