[Intel-gfx] [PATCH 42/56] TESTME: Either drop the last patch or fix it.

[Ben Widawsky]

I was getting unexplainable hangs with the last patch, even though I
think it should be correct. As the subject says, should this ever get
merged, it needs to be coordinated with the patch this reverts.

Revert "drm/i915/bdw: Optimize PDP loads"

This reverts commit 64053129b5cbd3a5f87dab27d026c17efbdf0387.
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 20 --------------------
 drivers/gpu/drm/i915/i915_gem_gtt.h |  1 -
 2 files changed, 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 3ea0c7d..d8bb4dc 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -438,20 +438,8 @@ static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			  struct intel_ring_buffer *ring,
 			  bool synchronous)
 {
-	struct drm_i915_private *dev_priv = ring->dev->dev_private;
 	int i, ret;
 
-	/* The RCS ring gets reloaded by the hardware context state. So we only
-	 * need to actually reload if one of the page directory pointer have
-	 * changed, or it's !RCS
-	 *
-	 * Aliasing PPGTT remains special, as we do not track it's
-	 * reloading needs.
-	 */
-	if (ppgtt != dev_priv->mm.aliasing_ppgtt &&
-	    ring->id == RCS && !ppgtt->pdp.needs_reload)
-		return 0;
-
 	for (i = GEN8_LEGACY_PDPES - 1; i >= 0; i--) {
 		struct i915_pagedir *pd = ppgtt->pdp.pagedirs[i];
 		dma_addr_t addr = pd ? pd->daddr : ppgtt->scratch_pt->daddr;
@@ -462,9 +450,6 @@ static int gen8_mm_switch(struct i915_hw_ppgtt *ppgtt,
 			return ret;
 	}
 
-
-	ppgtt->pdp.needs_reload = 0;
-
 	return 0;
 }
 
@@ -666,7 +651,6 @@ static void gen8_teardown_va_range(struct i915_address_space *vm,
 			free_pd_single(pd, vm->dev);
 			ppgtt->pdp.pagedirs[pdpe] = NULL;
 			WARN_ON(!test_and_clear_bit(pdpe, ppgtt->pdp.used_pdpes));
-			ppgtt->pdp.needs_reload = 1;
 		}
 	}
 }
@@ -917,8 +901,6 @@ static int gen8_alloc_va_range(struct i915_address_space *vm,
 		}
 
 		set_bit(pdpe, ppgtt->pdp.used_pdpes);
-		if (test_and_set_bit(pdpe, ppgtt->pdp.used_pdpes))
-			ppgtt->pdp.needs_reload = 1;
 
 		gen8_map_pagetable_range(pd, start, length, ppgtt->base.dev);
 	}
@@ -955,8 +937,6 @@ static int gen8_ppgtt_init_common(struct i915_hw_ppgtt *ppgtt, uint64_t size)
 	ppgtt->switch_mm = gen8_mm_switch;
 	ppgtt->base.insert_entries = gen8_ppgtt_insert_entries;
 
-	ppgtt->pdp.needs_reload = 1;
-
 	ppgtt->scratch_pd = alloc_pt_scratch(ppgtt->base.dev);
 	if (IS_ERR(ppgtt->scratch_pd))
 		return PTR_ERR(ppgtt->scratch_pd);
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index dd561f3..b3d0776 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -198,7 +198,6 @@ struct i915_pagedirpo {
 	/* struct page *page; */
 	DECLARE_BITMAP(used_pdpes, GEN8_LEGACY_PDPES);
 	struct i915_pagedir *pagedirs[GEN8_LEGACY_PDPES];
-	unsigned needs_reload:1;
 };
 
 struct i915_address_space {
-- 
1.9.2