Quoting Tvrtko Ursulin (2018-02-22 08:26:58)
>
> On 22/02/2018 07:51, Chris Wilson wrote:
> > Quoting Tvrtko Ursulin (2018-02-22 06:07:32)
> >> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> >>
> >> Place context in/out hooks into the GuC backend, when contexts are
> >> assigned to ports, and removed from them, in order to be able to
> >> provide engine busy stats in GuC mode.
> >>
> >> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> >> Testcase: igt/perf_pmu/busy-accuracy-*-*
> >> ---
> >> drivers/gpu/drm/i915/intel_guc_submission.c | 13 ++++++++++---
> >> 1 file changed, 10 insertions(+), 3 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
> >> index 649113c7a3c2..8e99f8fd6da2 100644
> >> --- a/drivers/gpu/drm/i915/intel_guc_submission.c
> >> +++ b/drivers/gpu/drm/i915/intel_guc_submission.c
> >> @@ -673,6 +673,7 @@ static void guc_dequeue(struct intel_engine_cs *engine)
> >> struct intel_engine_execlists * const execlists = &engine->execlists;
> >> struct execlist_port *port = execlists->port;
> >> struct i915_request *last = NULL;
> >> + struct i915_gem_context *last_ctx = NULL;
> >> const struct execlist_port * const last_port =
> >> &execlists->port[execlists->port_mask];
> >> bool submit = false;
> >> @@ -718,8 +719,13 @@ static void guc_dequeue(struct intel_engine_cs *engine)
> >> goto done;
> >> }
> >>
> >> - if (submit)
> >> + if (submit) {
> >> port_assign(port, last);
> >> + if (last->ctx != last_ctx) {
> >> + intel_engine_context_in(last->engine);
> >> + last_ctx = last->ctx;
> >> + }
> >> + }
> >> port++;
> >> }
> >>
> >> @@ -741,6 +747,8 @@ static void guc_dequeue(struct intel_engine_cs *engine)
> >> execlists->first = rb;
> >> if (submit) {
> >> port_assign(port, last);
> >> + if (last->ctx != last_ctx)
> >> + intel_engine_context_in(last->engine);
> >> execlists_set_active(execlists, EXECLISTS_ACTIVE_USER);
> >> guc_submit(engine);
> >> }
> >> @@ -763,6 +771,7 @@ static void guc_submission_tasklet(unsigned long data)
> >>
> >> rq = port_request(&port[0]);
> >> while (rq && i915_request_completed(rq)) {
> >> + intel_engine_context_out(rq->engine);
> >
> > If we only emit context_in once for 2 consecutive rq with the same
> > context, we would need to do the same for context_out.
> >
> > Will be interesting to see if this explodes, or we may need yet another
> > test :)
>
>
> I thought two consecutive requests with the same context is one port, so
> one context_in and one context_out. But maybe I'm wrong. Lets wait and
> see as you say. :)
The difference is we don't do lite-restore in the guc. I think you want
to move context_in to guc_submit().
-Chris
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