[igt-dev] [PATCH] i915/gem_spin_batch: Add test to execute in parallel on all engines

[Chris Wilson]

Quoting Vanshidhar Konda (2019-10-31 20:00:29)
> On Thu, Oct 31, 2019 at 07:29:07PM +0000, Chris Wilson wrote:
> >Quoting Vanshidhar Konda (2019-10-31 18:53:07)
> >> On Thu, Oct 31, 2019 at 06:17:28PM +0000, Chris Wilson wrote:
> >> >Quoting Vanshidhar Konda (2019-10-31 18:01:59)
> >> >> Add a test that submits batch buffers to all engines and executes them
> >> >> in parallel; either from the same context or from new contexts for each
> >> >> engine.
> >> >
> >> >Duplicating a test for what purpose? Pedagogy?
> >>
> >> It would be great if you could point out which test this duplicates.
> >> I've been looking for a test that proves a batch buffer is executing in
> >> parallel on all engines. Others I spoke to couldn't point out a test.
> >
> >There are quite a few, depending on just how you want to go about
> >proving execution. The focus for gem_spin_batch is demonstrating that
> >the igt_spin_t API works as advertised, not the uABI per se.
> >
> >So what's your primary focus here? Demonstrating how to use igt_spin_t,
> >verifying that we can schedule parallel engines, that we can specify
> >parallel set of engines, we report parallel activity or that the HW
> >behaves in a certain way?
> 
> The intention is to verify that the kernel can submit and hardware can execute
> batch buffers on all the command streamers in parallel. spin_batch
> seemed like a good candidate to keep each of the command streamers busy
> while we submit new spin_batch to the next command streamer.

"the kernel can submit and hardware can execute" => kernel selftest.
-Chris