[Intel-gfx] [PATH i-g-t v12 2/2] tests: add slice power programming test

[Chris Wilson]

Quoting Tvrtko Ursulin (2018-09-11 15:42:10)
> +       last_with_engines = -1;
> +       for (class = 0; class < ~0; class++) {
> +               for (instance = 0; instance < ~0; instance++) {
> +                       int ret;
> +
> +                       sseu.class = class;
> +                       sseu.instance = instance;
> +
> +                       ret = __gem_context_set_param(fd, &arg);
> +
> +                       if (has_engine(fd, class, instance)) {
> +                               if (engine_supports_sseu(fd, class, instance))

Meh, <rant>. I just don't like having hardcoded db on this side of the
ABI. The ABI imo is to ask the kernel if the device/engine is supported,
and should not allow for assumptions.

> +static void
> +test_dynamic(int fd, unsigned int flags)
> +{
> +       uint64_t pg_slice_mask = mask_minus_one(__slice_mask__);
> +       unsigned int pg_slice_count = __slice_count__ - 1;
> +       struct drm_i915_gem_context_param_sseu sseu = { };
> +       struct drm_i915_gem_context_param arg =
> +               { .param = I915_CONTEXT_PARAM_SSEU,
> +                 .ctx_id = gem_context_create(fd),
> +                 .size = sizeof(sseu),
> +                 .value = to_user_pointer(&sseu) };
> +       igt_spin_t *spin = NULL;
> +
> +       gem_context_get_param(fd, &arg);
> +
> +       /* First set the default mask */
> +       if (flags & TEST_BUSY)
> +               spin = __spin_sync(fd, arg.ctx_id, I915_EXEC_RENDER);
> +
> +       sseu.slice_mask = __slice_mask__;
> +       gem_context_set_param(fd, &arg);

I would also suggest a reset test here. Both reset when idle, and by
hangcheck/forced-reset of the spinner & active context.

And across suspend.

> +       igt_assert_eq(read_slice_count_busy(fd, arg.ctx_id, 0, spin),
> +                     __slice_count__);
> +       igt_assert_eq(read_slice_count(fd, 0, 0), __slice_count__);

In the read_slice I would suggest having a
igt_assert(gem_bo_busy(spin->handle));
-Chris