[Intel-gfx] [PATCH i-g-t] i915/perf_pmu: Check for hangs allowed

[Chris Wilson]

Quoting Tvrtko Ursulin (2019-01-28 11:00:43)
> 
> On 28/01/2019 10:18, Chris Wilson wrote:
> > Check we can reset the GPU before running the reset test.
> > 
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> > ---
> > Different meaning of flags, it's not the ring id!
> > ---
> >   tests/perf_pmu.c | 7 ++++++-
> >   1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
> > index 21292bf3a..c9881e59f 100644
> > --- a/tests/perf_pmu.c
> > +++ b/tests/perf_pmu.c
> > @@ -1812,8 +1812,13 @@ igt_main
> >                                       accuracy(fd, e, pct[i], 10);
> >                       }
> >   
> > -                     igt_subtest_f("busy-hang-%s", e->name)
> > +                     igt_subtest_f("busy-hang-%s", e->name) {
> > +                             igt_hang_t hang = igt_allow_hang(fd, 0, 0);
> > +
> >                               single(fd, e, TEST_BUSY | FLAG_HANG);
> > +
> > +                             igt_disallow_hang(fd, hang);
> > +                     }
> >               }
> >   
> >               /**
> > 
> 
> So all IGTs which trigger hangs/resets should call this?

Yeah, aside from checking we have gpu-reset, it is meant to prep the
context to expect a hang. It just happens to work fine until we hit a
corner case (such as gen2, guc currently, or too many resets).
-Chris