Re: [igt-dev] [Intel-gfx] [PATCH i-g-t] igt/gem_ctx_exec: Exercise I915_CONTEXT_PARAM_RECOVERABLE

[Mika Kuoppala <mika.kuoppala@linux.intel.com>]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> When RECOVERABLE is set, the kernel will attempt to automatically recover
> a context after a hang. But if it is unset, the kernel will ban the
> guilty context on a hang, preventing subsequent execution.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> ---
>  tests/gem_ctx_exec.c | 38 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 38 insertions(+)
>
> diff --git a/tests/gem_ctx_exec.c b/tests/gem_ctx_exec.c
> index 908b59af..1cd3b20e 100644
> --- a/tests/gem_ctx_exec.c
> +++ b/tests/gem_ctx_exec.c
> @@ -147,6 +147,41 @@ static void invalid_context(int fd, unsigned ring, uint32_t handle)
>  	igt_assert_eq(__gem_execbuf(fd, &execbuf), -ENOENT);
>  }
>  
> +static void norecovery(int i915)
> +{
> +	for (int pass = 1; pass >= 0; pass--) {
> +		struct drm_i915_gem_context_param param = {
> +			.ctx_id = gem_context_create(i915),
> +			.param = 0x7,
> +			.value = pass,
> +		};
> +		int expect = pass == 0 ? -EIO : 0;
> +		igt_spin_t *spin;
> +
> +		if (pass)
> +			igt_require(__gem_context_set_param(i915, &param) == 0);
> +		else
> +			gem_context_set_param(i915, &param);

You are trying in here to make the asserts unique?

> +		gem_context_get_param(i915, &param);
> +		igt_assert_eq(param.value, pass);
> +
> +		spin = __igt_spin_batch_new(i915,
> +					    .ctx = param.ctx_id,
> +					    .flags = IGT_SPIN_POLL_RUN);
> +		igt_assert(spin->running);
> +
> +		while (!READ_ONCE(*spin->running))
> +			;

wait that it is running...

> +		igt_force_gpu_reset(i915);
> +

then reset.

> +		igt_spin_batch_end(spin);

> +		igt_assert_eq(__gem_execbuf(i915, &spin->execbuf), expect);

Hmm where do we sync with hang resolution. Is it the handoff in
the wedged debugfs entry?

-Mika

> +		igt_spin_batch_free(i915, spin);
> +
> +		gem_context_destroy(i915, param.ctx_id);
> +	}
> +}
> +
>  igt_main
>  {
>  	const uint32_t batch[2] = { 0, MI_BATCH_BUFFER_END };
> @@ -190,6 +225,9 @@ igt_main
>  	igt_subtest("eviction")
>  		big_exec(fd, handle, 0);
>  
> +	igt_subtest("norecovery")
> +		norecovery(fd);
> +
>  	igt_subtest("reset-pin-leak") {
>  		int i;
>  
> -- 
> 2.19.0
>
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