drm/i915/gtt: Use NULL to encode scratch shadow entries

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We can simplify our gtt walking code by comparing against NULL for
scratch entries as opposed to looking up the distinct per-level scratch
pointer.

The only caveat is to remember to protect external parties and map the
NULL to the scratch top pd.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190712094327.24437-6-chris@chris-wilson.co.uk

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This commit is contained in:

Chris Wilson 2019-07-12 10:43:27 +01:00

parent c03cbe4c0a

commit 6239901c57

2 changed files with 33 additions and 76 deletions

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107

drivers/gpu/drm/i915/i915_gem_gtt.c

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2

drivers/gpu/drm/i915/i915_gem_gtt.h

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