Commit 267e80ee authored Apr 19, 2019 by Chris Wilson

drm/i915/gtt: Skip clearing the GGTT under gen6+ full-ppgtt

If we know that the user cannot access the GGTT, by virtue of having a
segregated memory area, we can skip clearing the unused entries as they
cannot be accessed.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190419201207.5477-1-chris@chris-wilson.co.uk

parent b972fffa

drivers/gpu/drm/i915/i915_gem_gtt.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -3280,6 +3280,8 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt)
		size = gen6_get_total_gtt_size(snb_gmch_ctl);
		ggtt->vm.total = (size / sizeof(gen6_pte_t)) * I915_GTT_PAGE_SIZE;

		ggtt->vm.clear_range = nop_clear_range;
		if (!HAS_FULL_PPGTT(dev_priv) \|\| intel_scanout_needs_vtd_wa(dev_priv))
		ggtt->vm.clear_range = gen6_ggtt_clear_range;
		ggtt->vm.insert_page = gen6_ggtt_insert_page;
		ggtt->vm.insert_entries = gen6_ggtt_insert_entries;

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