[PATCH I-G-T v5] tests/intel/i915_hangman: Fix spin engine hang

[Krzysztof Karas]

Hi Mikołaj,

> On DG2 when RCS engine is active, the CCS engine freezes which leads to
> hangman test failures.
> This patch disables RCS and CCS background spins when testing any engine
> on hangman.
> 
> Signed-off-by: Mikolaj Wasiak <mikolaj.wasiak at intel.com>
> ---
>  tests/intel/i915_hangman.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/tests/intel/i915_hangman.c b/tests/intel/i915_hangman.c
> index a556eec53..6f1fdc788 100644
> --- a/tests/intel/i915_hangman.c
> +++ b/tests/intel/i915_hangman.c
> @@ -365,6 +365,12 @@ static void chk_err(int *dst, int err, int expected)
>  #define ERR_FENCE_END  3
>  #define ERR_FENCE_STAT 4
>  
> +static bool is_rcs_ccs(const struct intel_execution_engine2 *e)
> +{
> +	return e->class == I915_ENGINE_CLASS_COMPUTE ||
> +	       e->class == I915_ENGINE_CLASS_RENDER;
> +}
> +
>  static void
>  test_engine_hang(const intel_ctx_t *ctx,
>  		 const struct intel_execution_engine2 *e, unsigned int flags)
> @@ -388,6 +394,14 @@ test_engine_hang(const intel_ctx_t *ctx,
>  	 */
>  	num_ctx = 0;
>  	for_each_ctx_engine(device, ctx, other) {
> +		/* Due to Wa_14014494547:DG2 we can't run RCS and CCS
> +		 * in parallel. We still want background spin of the
> +		 * same type as hanged spin to be run.
> +		 */
> +		if (IS_DG2(intel_get_drm_devid(device)) && is_rcs_ccs(other) &&
> +		    other->class != e->class)
> +			continue;
> +
>  		local_ctx[num_ctx] = intel_ctx_create(device, &ctx->cfg);
>  		context_unban(device, local_ctx[num_ctx]->id);
>  		ahndN = get_reloc_ahnd(device, local_ctx[num_ctx]->id);
> -- 
> 2.47.1
>

Reviewed-by: Krzysztof Karas <krzysztof.karas at intel.com>

Krzysztof