[Intel-gfx] [PATCH 31/48] drm/i915: Write PDEs at init instead of enable

[Ben Widawsky]

From: Ben Widawsky <ben at bwidawsk.net>

We won't be calling enable() for all PPGTTs. We do need to write PDEs
for all PPGTTs however. By moving the writing to init (which is called
for all PPGTTs) we should accomplish this.

ADD NOTE ABOUT PDE restore

TODO: Eventually, we should allocate the page tables on demand.

v2: Rebased on BDW. Only do PDEs for pre-gen8

Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index f9f7267..2c93160 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -633,8 +633,6 @@ static int gen7_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
 	uint32_t ecochk, ecobits;
 	int i;
 
-	gen6_write_pdes(ppgtt);
-
 	ecobits = I915_READ(GAC_ECO_BITS);
 	I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_PPGTT_CACHE64B);
 
@@ -668,8 +666,6 @@ static int gen6_ppgtt_enable(struct i915_hw_ppgtt *ppgtt)
 	uint32_t ecochk, gab_ctl, ecobits;
 	int i;
 
-	gen6_write_pdes(ppgtt);
-
 	ecobits = I915_READ(GAC_ECO_BITS);
 	I915_WRITE(GAC_ECO_BITS, ecobits | ECOBITS_SNB_BIT |
 		   ECOBITS_PPGTT_CACHE64B);
@@ -908,6 +904,8 @@ int i915_gem_init_ppgtt(struct drm_device *dev, struct i915_hw_ppgtt *ppgtt)
 		kref_init(&ppgtt->ref);
 		drm_mm_init(&ppgtt->base.mm, ppgtt->base.start,
 			    ppgtt->base.total);
+		if (INTEL_INFO(dev)->gen < 8)
+			gen6_write_pdes(ppgtt);
 	}
 
 	return ret;
@@ -1061,6 +1059,9 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev)
 		vma->bind_vma(vma, obj->cache_level, GLOBAL_BIND);
 	}
 
+	if (dev_priv->mm.aliasing_ppgtt)
+		gen6_write_pdes(dev_priv->mm.aliasing_ppgtt);
+
 	i915_gem_chipset_flush(dev);
 }
 
-- 
1.8.4.2