drm/i915/execlists: Split the atomic test_and_clear_bit for irq handler

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Rather than impose the cost of a locked test before queuing a new
request, reduce it to a simple test_bit() with a following clear_bit()
prior to doing the CSB check. This ensure that if an interrupt does
occur whilst reading from the CSB, we still detect it (the interrupt
would trigger a rescheduling of the tasklet anyway).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170321113320.2603-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

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Chris Wilson 2017-03-21 11:33:20 +00:00

parent 272bce17cc

commit 899f6204c0

1 changed files with 6 additions and 1 deletions

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drivers/gpu/drm/i915/intel_lrc.c

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