tree 49e73b825a6098bece43c4645650e7d9d54b1ab5
parent c87d50cc9fcc634e09d239e6d10293319eafae5f
author Chris Wilson <chris@chris-wilson.co.uk> 1475611888 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1475653206 +0100

drm/i915: Disable irqs across GPU reset

Whilst we reset the GPU, we want to prevent execlists from submitting
new work (which it does via an interrupt handler). To achieve this we
disable the irq (and drain the irq tasklet) around the reset. When we
enable it again afters, the interrupt queue should be empty and we can
reinitialise from a known state without fear of the tasklet running
concurrently.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161004201132.21801-4-chris@chris-wilson.co.uk