[PATCH] drm/i915/uapi: Document DRM_I915_QUERY_HWCONFIG_BLOB

[Daniel Vetter]

On Fri, Mar 25, 2022 at 09:49:16AM +0000, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> 
> UAPI with absolutely no documentation should not have been added -
> clarify blob format and content will be described externally.
> 
> Fixes: 78e1fb3112c0 ("drm/i915/uapi: Add query for hwconfig blob")
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Co-developed-by: Jordan Justen <jordan.l.justen at intel.com>
> Cc: Jon Bloomfield <jon.bloomfield at intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: John Harrison <john.c.harrison at intel.com>
> Cc: Jon Ewins <jon.ewins at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> ---
>  include/uapi/drm/i915_drm.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 071ffd9d51f1..8d0719bee8fc 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -2683,6 +2683,9 @@ struct drm_i915_perf_oa_config {
>   *
>   * The behaviour is determined by the @query_id. Note that exactly what
>   * @data_ptr is also depends on the specific @query_id.
> + *
> + * For specific queries see:
> + *  * `GuC HWCONFIG blob uAPI`_

I'd put this into the @query_id section, and then make it an item list
with the #define as the label, so that it becomes tidy and can neatly
iterate them all.

Anyway we can bikeshed this all more in a follow-up.

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

>   */
>  struct drm_i915_query_item {
>  	/** @query_id: The id for this query */
> @@ -3135,6 +3138,16 @@ struct drm_i915_query_memory_regions {
>  	struct drm_i915_memory_region_info regions[];
>  };
>  
> +/**
> + * DOC: GuC HWCONFIG blob uAPI
> + *
> + * The GuC produces a blob with information about the current device.
> + * i915 reads this blob from GuC and makes it available via this uAPI.
> + *
> + * The format and meading of the blob content are documented in the
> + * Programmer's Reference Manual.
> + */
> +
>  /**
>   * struct drm_i915_gem_create_ext - Existing gem_create behaviour, with added
>   * extension support using struct i915_user_extension.
> -- 
> 2.32.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch