tree d58292d939b2339d5fdfe3edf8d76cfc5820eb43
parent 4680816be3362bdf6ac712cbdc6098c76febe78f
author Chris Wilson <chris@chris-wilson.co.uk> 1477659529 +0100
committer Chris Wilson <chris@chris-wilson.co.uk> 1477684433 +0100

drm/i915: Introduce a global_seqno for each request

Though we will have multiple timelines, we still have a single timeline
of execution. This we can use to provide an execution and retirement order
of requests. This keeps tracking execution of requests simple, and vital
for preserving a single waiter (i.e. so that we can order the waiters so
that only the earliest to wakeup need be woken). To accomplish this we
distinguish the seqno used to order requests per-context (external) and
that used internally for execution.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161028125858.23563-26-chris@chris-wilson.co.uk