leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/i915/execlists: Skip redundant resubmission

Browse Source 
If we unwind the active requests, and on resubmission discover that we
intend to preempt the active contexts with themselves, simply skip the
ELSP submission.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191003210100.22250-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-10-03 22:00:56 +01:00
parent 3032c0b47e
commit 44d0a9c05b
1 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/gpu/drm/i915/gt/intel_lrc.c
View File

@ -1739,11 +1739,26 @@ done:
if (submit) {
*port = execlists_schedule_in(last, port - execlists->pending);
memset(port + 1, 0, (last_port - port) * sizeof(*port));
execlists->switch_priority_hint =
switch_prio(engine, *execlists->pending);
/*
* Skip if we ended up with exactly the same set of requests,
* e.g. trying to timeslice a pair of ordered contexts
*/
if (!memcmp(execlists->active, execlists->pending,
(port - execlists->pending + 1) * sizeof(*port))) {
do
execlists_schedule_out(fetch_and_zero(port));
while (port-- != execlists->pending);
goto skip_submit;
}
memset(port + 1, 0, (last_port - port) * sizeof(*port));
execlists_submit_ports(engine);
} else {
skip_submit:
ring_set_paused(engine, 0);
}
}