Re: [PATCH] drm/i915: Introduce struct class_instance for engines across the uAPI

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Fri, Apr 12, 2019 at 07:51:47AM +0100, Chris Wilson wrote:
> SSEU reprogramming of the context introduced the notion of engine class
> and instance for a forwards compatible method of describing any engine
> beyond the old execbuf interface. We wish to adopt this class:instance
> description for more interfaces, so pull it out into a separate type for
> userspace convenience.
> 
> References: e46c2e99f600 ("drm/i915: Expose RPCS (SSEU) configuration to userspace (Gen11 only)")

I'm a bit confused here how/why this References become a Fixes.

Anyway, it didn't applied cleaned on drm-intel-fixes and it seems
to me this is not needed there, but if I'm wrong, please let me know.

Thanks,
Rodrigo.

> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
> Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
> Cc: Andi Shyti <andi@etezian.org>
> ---
> Commit e46c2e99f600 ("drm/i915: Expose RPCS (SSEU) configuration to
> userspace (Gen11 only)") is for v5.1, so we still do have a tiny bit of
> time to enact this change.
> ---
>  drivers/gpu/drm/i915/i915_gem_context.c |  8 ++++----
>  include/uapi/drm/i915_drm.h             | 11 +++++++++--
>  2 files changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 7fc34ab6df87..dd728b26b5aa 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -1386,8 +1386,8 @@ static int set_sseu(struct i915_gem_context *ctx,
>  		return -EINVAL;
>  
>  	engine = intel_engine_lookup_user(i915,
> -					  user_sseu.engine_class,
> -					  user_sseu.engine_instance);
> +					  user_sseu.engine.engine_class,
> +					  user_sseu.engine.engine_instance);
>  	if (!engine)
>  		return -EINVAL;
>  
> @@ -1626,8 +1626,8 @@ static int get_sseu(struct i915_gem_context *ctx,
>  		return -EINVAL;
>  
>  	engine = intel_engine_lookup_user(ctx->i915,
> -					  user_sseu.engine_class,
> -					  user_sseu.engine_instance);
> +					  user_sseu.engine.engine_class,
> +					  user_sseu.engine.engine_instance);
>  	if (!engine)
>  		return -EINVAL;
>  
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 52051d24d89d..f6369c462458 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1500,6 +1500,14 @@ struct drm_i915_gem_context_param {
>  	__u64 value;
>  };
>  
> +union drm_i915_engine_class_instance {
> +	struct i915_engine_class_instance {
> +		__u16 engine_class;
> +		__u16 engine_instance;
> +	} class_instance;
> +	__u32 ci;
> +};
> +
>  /**
>   * Context SSEU programming
>   *
> @@ -1525,8 +1533,7 @@ struct drm_i915_gem_context_param_sseu {
>  	/*
>  	 * Engine class & instance to be configured or queried.
>  	 */
> -	__u16 engine_class;
> -	__u16 engine_instance;
> +	struct i915_engine_class_instance engine;
>  
>  	/*
>  	 * Unused for now. Must be cleared to zero.
> -- 
> 2.20.1
> 
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