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Chris Wilson authored
Similar to the issue with reading from the context status buffer, see commit 26720ab9 ("drm/i915: Move CSB MMIO reads out of the execlists lock"), we frequently write to the ELSP register (4 writes per interrupt) and know we hold the required spinlock and forcewake throughout. We can further reduce the cost of writing these registers beyond the I915_WRITE_FW() by precomputing the address of the ELSP register. We also note that the subsequent read serves no purpose here, and are happy to see it go. v2: Address I915_WRITE mistakes in changelog text data bss dec hex filename 1259784 4581 576 1264941 134d2d drivers/gpu/drm/i915/i915.ko 1259720 4581 576 1264877 134ced drivers/gpu/drm/i915/i915.ko Saves 64 bytes of address recomputation. Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20160909131201.16673-4-chris@chris-wilson.co.uk
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