[PATCH 2/2] drm/xe/guc: Add kernel-doc for xe_guc_ct_send_recv()

[Matthew Brost]

On Fri, Jan 12, 2024 at 11:25:54AM +0100, Michal Wajdeczko wrote:
> The communication with the GuC firmware is crucial for the driver
> but unfortunately it has limited documentation.  Add initial

The first sentence doesn't seem necessary.

> documentation for recently updated xe_guc_ct_send_recv().
> 
> Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
> Cc: Matthew Brost <matthew.brost at intel.com>
> ---
>  drivers/gpu/drm/xe/xe_guc_ct.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c
> index 4ae1a0cd9537..ee5d99456aeb 100644
> --- a/drivers/gpu/drm/xe/xe_guc_ct.c
> +++ b/drivers/gpu/drm/xe/xe_guc_ct.c
> @@ -785,6 +785,24 @@ static int guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len,
>  	return ret > 0 ? response_buffer ? g2h_fence.response_len : g2h_fence.response_data : ret;
>  }
>  
> +/**
> + * xe_guc_ct_send_recv - Send and receive HXG to the GuC
> + * @ct: the &xe_guc_ct
> + * @action: the dword array with `HXG Request`_ message (can't be NULL)

What's the deal with the _ trailing everwhere? Is this kernel doc link thing?

Matt

> + * @len: length of the `HXG Request`_ message (in dwords, can't be 0)
> + * @response_buffer: placeholder for the `HXG Response`_ message (can be NULL)
> + *
> + * Send a `HXG Request`_ message to the GuC over CT communication channel and
> + * blocks until GuC replies with a `HXG Response`_ message.
> + *
> + * For non-blocking communication with GuC use xe_guc_ct_send().
> + *
> + * Note: The size of &response_buffer must be at least GUC_CTB_MAX_DWORDS_.
> + *
> + * Return: response length (in dwords) if &response_buffer was not NULL, or
> + *         DATA0 from `HXG Response`_ if &response_buffer was NULL, or
> + *         a negative error code on failure.
> + */
>  int xe_guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len,
>  			u32 *response_buffer)
>  {
> -- 
> 2.25.1
>