Re: [Intel-gfx] [PATCH 19/41] drm/i915/gt: Show scheduler queues when dumping state

[Chris Wilson <chris@chris-wilson.co.uk>]

Quoting Tvrtko Ursulin (2021-01-27 14:13:11)
> 
> On 25/01/2021 14:01, Chris Wilson wrote:
> > Move the scheduler pretty printer from out of the execlists state to
> > match its more common location.
> > 
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > ---
> >   drivers/gpu/drm/i915/gt/intel_engine_cs.c | 34 +++++++++++++----------
> >   1 file changed, 19 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > index cdd07aeada05..2f9a8960144b 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
> > @@ -1443,20 +1443,15 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
> >   
> >       if (intel_engine_in_guc_submission_mode(engine)) {
> >               /* nothing to print yet */
> > -     } else if (HAS_EXECLISTS(dev_priv)) {
> > -             struct i915_request * const *port, *rq;
> >               const u32 *hws =
> >                       &engine->status_page.addr[I915_HWS_CSB_BUF0_INDEX];
> >               const u8 num_entries = execlists->csb_size;
> >               unsigned int idx;
> >               u8 read, write;
> >   
> > -             drm_printf(m, "\tExeclist tasklet queued? %s (%s), preempt? %s, timeslice? %s\n",
> > -                        yesno(test_bit(TASKLET_STATE_SCHED,
> > -                                       &engine->active.tasklet.state)),
> > -                        enableddisabled(!atomic_read(&engine->active.tasklet.count)),
> > -                        repr_timer(&engine->execlists.preempt),
> > -                        repr_timer(&engine->execlists.timer));
> > +             drm_printf(m, "\tExeclists preempt? %s, timeslice? %s\n",
> > +                        repr_timer(&execlists->preempt),
> > +                        repr_timer(&execlists->timer));
> >   
> >               read = execlists->csb_head;
> >               write = READ_ONCE(*execlists->csb_write);
> > @@ -1477,6 +1472,22 @@ static void intel_engine_print_registers(struct intel_engine_cs *engine,
> >                       drm_printf(m, "\tExeclist CSB[%d]: 0x%08x, context: %d\n",
> >                                  idx, hws[idx * 2], hws[idx * 2 + 1]);
> >               }
> > +     } else if (INTEL_GEN(dev_priv) > 6) {
> > +             drm_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
> > +                        ENGINE_READ(engine, RING_PP_DIR_BASE));
> > +             drm_printf(m, "\tPP_DIR_BASE_READ: 0x%08x\n",
> > +                        ENGINE_READ(engine, RING_PP_DIR_BASE_READ));
> > +             drm_printf(m, "\tPP_DIR_DCLV: 0x%08x\n",
> > +                        ENGINE_READ(engine, RING_PP_DIR_DCLV));
> > +     }
> > +
> > +     if (engine->active.tasklet.func) {
> > +             struct i915_request * const *port, *rq;
> > +
> > +             drm_printf(m, "\tTasklet queued? %s (%s)\n",
> > +                        yesno(test_bit(TASKLET_STATE_SCHED,
> > +                                       &engine->active.tasklet.state)),
> > +                        enableddisabled(!atomic_read(&engine->active.tasklet.count)));
> 
> Or have i915_sched_print_state() exported? Again it will depend on how 
> clean split will be possible.

Not quite, unfortunately this is not dumping generic state but the
backend bookkeeping for execlists/ringscheduler. Common for that pair,
not so common with the guc.

I guess I oversold it.
-Chris
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