Re: [igt-dev] [PATCH i-g-t] i915: Fix gem_context_has_engine_map() for older kernels

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

On 02/07/2019 11:50, Chris Wilson wrote:
> CI is currently breaking on linus/drm-intel-fixes due to the assert that
> the kernel supports context engine maps. Report the lack of maps on
> older kernels gracefully!
> 
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
> ---
>   lib/i915/gem_engine_topology.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
> index cae5a0292..cc2b3ff6e 100644
> --- a/lib/i915/gem_engine_topology.c
> +++ b/lib/i915/gem_engine_topology.c
> @@ -321,10 +321,13 @@ bool gem_context_has_engine_map(int fd, uint32_t ctx)
>   		.param = I915_CONTEXT_PARAM_ENGINES,
>   		.ctx_id = ctx
>   	};
> -	int ret;
>   
> -	ret = __gem_context_get_param(fd, &param);
> -	igt_assert_eq(ret, 0);
> +	/*
> +	 * If the kernel is too old to support PARAM_ENGINES,
> +	 * then naturally is has no engine map.
> +	 */
> +	if (__gem_context_get_param(fd, &param))
> +		return false;
>   
>   	return param.size;
>   }
> 

Bleurgh, sorry. I even have some memories of checking ret, otherwise I 
wouldn't have had the local. Don't know what happened there..

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Regards,

Tvrtko
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