tree 82e59e510c5ebd5779600ceba7f20eb6de93774f
parent 4f6d8fcf1a53d4d544d9a13f70cb2669572b7ecb
author Chris Wilson <chris@chris-wilson.co.uk> 1525701446 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1525787956 +0100

drm/i915: Disable tasklet scheduling across initial scheduling

During request submission, we call the engine->schedule() function so
that we may reorder the active requests as required for inheriting the
new request's priority. This may schedule several tasklets to run on the
local CPU, but we will need to schedule the tasklets again for the new
request. Delay all the local tasklets until the end, so that we only
have to process the queue just once.

v2: Beware PREEMPT_RCU, as then local_bh_disable() is then not a
superset of rcu_read_lock().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180507135731.10587-2-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>