If we will completely overwrite the PT with PTEs for the object, we can
forgo filling it with scratch entries.
References: 14826673247e ("drm/i915: Only initialize partially filled pagetables")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.william.auld@xxxxxxxxx>
Reviewed-by: Matthew Auld <matthew.william.auld@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index daecbf91efc6..6f437b28fe2a 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1846,7 +1846,8 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
if (IS_ERR(pt))
goto unwind_out;
- gen6_initialize_pt(vm, pt);
+ if (count < GEN6_PTES)
+ gen6_initialize_pt(vm, pt);
old = cmpxchg(&ppgtt->base.pd.page_table[pde],
vm->scratch_pt, pt);
--
2.20.1
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