[Intel-gfx] [PATCH i-g-t 2/3] tests/perf_pmu: Simplify interrupt testing

[Chris Wilson]

Quoting Tvrtko Ursulin (2017-12-19 15:45:42)
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> Rather than calibrate and emit nop batches, use a manually signalled chain
> of spinners to generate the desired interrupts.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> ---
> -       /* Unplug the calibrated queue and wait for all the fences */
> -       igt_spin_batch_free(gem_fd, spin);
> -       igt_assert_eq(poll(&pfd, 1, 2 * test_duration_ms), 1);
> -       close(pfd.fd);
> +               pfd.fd = spin[i]->out_fence;
> +               igt_spin_batch_set_timeout(spin[i], timeout_ms * 1e6);
> +               igt_assert_eq(poll(&pfd, 1, 2 * timeout_ms), 1);

Oh, still with the synchronous behaviour, bleurgh.
-Chris