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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
This commit is contained in:
Chris Wilson 2019-04-19 21:12:07 +01:00
parent b972fffa11
commit 267e80ee6a
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/i915_gem_gtt.c
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@ -3280,7 +3280,9 @@ 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 = gen6_ggtt_clear_range;
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;
ggtt->vm.cleanup = gen6_gmch_remove;