[PATCH 8/8] drm/i915: Clear range when unbinding closed vma

[Michał Winiarski <michal.winiarski@xxxxxxxxx>]

Since we've introduced ppgtt shrinking, most of the vmas should already
be unbounded when ppgtt is being released.
This allows us to take care of leftovers and assert that all vmas are
unbounded, removing the iteration during ppgtt release.

Cc: Arkadiusz Hiler <arkadiusz.hiler@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Signed-off-by: Michał Winiarski <michal.winiarski@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 36 ++----------------------------------
 drivers/gpu/drm/i915/i915_vma.c     |  7 +++----
 2 files changed, 5 insertions(+), 38 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 50d4861..4326dcc 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -898,22 +898,6 @@ static void gen8_ppgtt_insert_entries(struct i915_address_space *vm,
 	}
 }
 
-static void gen8_free_page_tables(struct drm_i915_private *dev_priv,
-				  struct i915_page_directory *pd)
-{
-	int i;
-
-	if (!px_page(pd))
-		return;
-
-	for (i = 0; i < I915_PDES; i++) {
-		if (pd->page_table[i]) {
-			free_pt(dev_priv, pd->page_table[i]);
-			pd->page_table[i] = NULL;
-		}
-	}
-}
-
 static int gen8_init_scratch(struct i915_address_space *vm)
 {
 	struct drm_i915_private *dev_priv = vm->i915;
@@ -1005,30 +989,14 @@ static void gen8_free_scratch(struct i915_address_space *vm)
 static void gen8_ppgtt_cleanup_3lvl(struct drm_i915_private *dev_priv,
 				    struct i915_page_directory_pointer *pdp)
 {
-	int i;
-
-	for (i = 0; i < I915_PDPES_PER_PDP(dev_priv); i++) {
-		if (pdp->page_directory[i]) {
-			gen8_free_page_tables(dev_priv, pdp->page_directory[i]);
-			pdp->page_directory[i] = NULL;
-		}
-	}
-
+	WARN_ON(pdp->num_pdpes != 0);
 	free_pdp(dev_priv, pdp);
 }
 
 static void gen8_ppgtt_cleanup_4lvl(struct drm_i915_private *dev_priv,
 				    struct i915_pml4 *pml4)
 {
-	int i;
-
-	for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) {
-		if (pml4->pdps[i]) {
-			gen8_ppgtt_cleanup_3lvl(dev_priv, pml4->pdps[i]);
-			pml4->pdps[i] = NULL;
-		}
-	}
-
+	WARN_ON(pml4->num_pml4es != 0);
 	cleanup_px(dev_priv, pml4);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index 37c3eeb..248875f 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -603,10 +603,9 @@ int i915_vma_unbind(struct i915_vma *vma)
 		vma->flags &= ~I915_VMA_CAN_FENCE;
 	}
 
-	if (likely(!vma->vm->closed)) {
-		trace_i915_vma_unbind(vma);
-		vma->vm->unbind_vma(vma);
-	}
+	trace_i915_vma_unbind(vma);
+	vma->vm->unbind_vma(vma);
+
 	vma->flags &= ~(I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND);
 
 	drm_mm_remove_node(&vma->node);
-- 
2.7.4

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