Re: [PATCH i-g-t] tests/i915/gem_ctx_switch: Fix I915_EXEC_DEFAULT testing

[Ramalingam C <ramalingam.c@xxxxxxxxx>]

On 2019-07-01 at 08:52:05 +0100, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> 
> Commit ad129d2a583689765eaef31ff57e8cdd219f1d05
> ("tests/i915/gem_ctx_switch: Update with engine discovery") broke testing
> of I915_EXEC_DEFAULT. Bring it back.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> Reported-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Andi Shyti <andi.shyti@xxxxxxxxx>
> Cc: Ramalingam C <ramalingam.c@xxxxxxxxx>
> ---
>  lib/i915/gem_engine_topology.c | 26 +++++++++++++++++++-------
>  lib/i915/gem_engine_topology.h |  3 +--
>  tests/i915/gem_ctx_switch.c    |  8 ++++++--
>  3 files changed, 26 insertions(+), 11 deletions(-)
> 
> diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
> index 6cfe3468e3d8..cae5a0292b02 100644
> --- a/lib/i915/gem_engine_topology.c
> +++ b/lib/i915/gem_engine_topology.c
> @@ -290,17 +290,29 @@ bool gem_has_engine_topology(int fd)
>  	return !__gem_context_get_param(fd, &param);
>  }
>  
> -const struct intel_execution_engine2 *
> -gem_eb_flags_to_engine(unsigned int flags)
> +struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags)
>  {
> -	const struct intel_execution_engine2 *e2;
> +	const unsigned int ring = flags & (I915_EXEC_RING_MASK | 3 << 13);
> +	struct intel_execution_engine2 e2__ = {
> +		.class = -1,
> +		.instance = -1,
> +		.flags = -1,
> +		.name = "invalid"
> +	};
> +
> +	if (ring == I915_EXEC_DEFAULT) {
> +		e2__.flags = I915_EXEC_DEFAULT;
> +		e2__.name = "default";
> +	} else {
> +		const struct intel_execution_engine2 *e2;
>  
> -	__for_each_static_engine(e2) {
> -		if (e2->flags == flags)
> -			return e2;
> +		__for_each_static_engine(e2) {
> +			if (e2->flags == ring)
> +				return *e2;
> +		}
>  	}
>  
> -	return NULL;
> +	return e2__;
>  }
>  
>  bool gem_context_has_engine_map(int fd, uint32_t ctx)
> diff --git a/lib/i915/gem_engine_topology.h b/lib/i915/gem_engine_topology.h
> index b175483fac1c..9b6e2d4f9cd8 100644
> --- a/lib/i915/gem_engine_topology.h
> +++ b/lib/i915/gem_engine_topology.h
> @@ -55,8 +55,7 @@ void gem_context_set_all_engines(int fd, uint32_t ctx);
>  
>  bool gem_context_has_engine_map(int fd, uint32_t ctx);
>  
> -const struct intel_execution_engine2 *
> -gem_eb_flags_to_engine(unsigned int flags);
> +struct intel_execution_engine2 gem_eb_flags_to_engine(unsigned int flags);
>  
>  #define __for_each_static_engine(e__) \
>  	for ((e__) = intel_execution_engines2; (e__)->name; (e__)++)
> diff --git a/tests/i915/gem_ctx_switch.c b/tests/i915/gem_ctx_switch.c
> index 407905de2d34..c071def7825e 100644
> --- a/tests/i915/gem_ctx_switch.c
> +++ b/tests/i915/gem_ctx_switch.c
> @@ -347,10 +347,14 @@ igt_main
>  
>  	/* Legacy testing must be first. */
>  	for (e = intel_execution_engines; e->name; e++) {
> -		e2 = gem_eb_flags_to_engine(e->exec_id | e->flags);
Could we have something like

		gem_eb_flags_to_engine(e->exec_id | e->flags, e2);
		if (e2->flags == -1)
			continue;

this way extra e2__ declaration at caller can be avoided.

Apart from that looks good to me
Reviewed-by: Ramalingam C <ramalingam.c@xxxxxxxxx>

-Ram
> -		if (!e2)
> +		struct intel_execution_engine2 e2__;
> +
> +		e2__ = gem_eb_flags_to_engine(e->exec_id | e->flags);
> +		if (e2__.flags == -1)
>  			continue; /* I915_EXEC_BSD with no ring selectors */
>  
> +		e2 = &e2__;
> +
>  		for (typeof(*phases) *p = phases; p->name; p++) {
>  			igt_subtest_group {
>  				igt_fixture {
> -- 
> 2.20.1
> 
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