Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> 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>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
> ---
> 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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