[igt-dev] [PATCH i-g-t 3/4] lib/i915: Don't confuse param.size

[Stimson, Dale B]

On 2020-02-14 19:40:15, Chris Wilson wrote:
> If the context has no engines, it has no engines -- do not override the
> user's setup.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

Reviewed-by: Dale B Stimson <dale.b.stimson at intel.com>

> ---
>  lib/i915/gem_engine_topology.c | 19 +++++++------------
>  1 file changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/lib/i915/gem_engine_topology.c b/lib/i915/gem_engine_topology.c
> index 9daa03df4..ca1c1fdb9 100644
> --- a/lib/i915/gem_engine_topology.c
> +++ b/lib/i915/gem_engine_topology.c
> @@ -195,17 +195,6 @@ static int gem_topology_get_param(int fd,
>  	if (__gem_context_get_param(fd, p))
>  		return -1; /* using default engine map */
>  
> -	if (!p->size)
> -		return 0;
> -
> -	/* size will store the engine count */
> -	p->size = (p->size - sizeof(struct i915_context_param_engines)) /
> -		  (offsetof(struct i915_context_param_engines,
> -			    engines[1]) -
> -		  sizeof(struct i915_context_param_engines));
> -
> -	igt_assert_f(p->size <= GEM_MAX_ENGINES, "unsupported engine count\n");
> -
>  	return 0;
>  }
>  
> @@ -242,7 +231,13 @@ struct intel_engine_data intel_init_engine_list(int fd, uint32_t ctx_id)
>  		query_engine_list(fd, &engine_data);
>  		ctx_map_engines(fd, &engine_data, &param);
>  	} else {
> -		/* param.size contains the engine count */
> +		/* engine count can be inferred from size */
> +		param.size -= sizeof(struct i915_context_param_engines);
> +		param.size /= sizeof(struct i915_engine_class_instance);
> +
> +		igt_assert_f(param.size <= GEM_MAX_ENGINES,
> +			     "unsupported engine count\n");
> +
>  		for (i = 0; i < param.size; i++)
>  			init_engine(&engine_data.engines[i],
>  				    engines.engines[i].engine_class,
> -- 
> 2.25.0
> 
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