drm/i915: Convert clflushed pagetables over to WC maps

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We flush the entire page every time we update a few bytes, making the
update of a page table many, many times slower than is required. If we
create a WC map of the page for our updates, we can avoid the clflush
but incur additional cost for creating the pagetable. We amoritize that
cost by reusing page vmappings, and only changing the page protection in
batches.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

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This commit is contained in:

Chris Wilson 2017-02-15 08:43:40 +00:00

parent cbc4e9e6a6

commit 8448661d65

4 changed files with 181 additions and 170 deletions

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2

drivers/gpu/drm/i915/i915_drv.h

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333

drivers/gpu/drm/i915/i915_gem_gtt.c

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8

drivers/gpu/drm/i915/i915_gem_gtt.h

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8

drivers/gpu/drm/i915/selftests/i915_gem_gtt.c

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