linux-kernel - Re: [PATCH 1/5] media: mediatek: vcodec: add params to record lat and core lat

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Date:   Tue, 13 Dec 2022 10:09:54 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Chen-Yu Tsai <wenst@...omium.org>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Fritz Koenig <frkoenig@...omium.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Steve Cho <stevecho@...omium.org>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH 1/5] media: mediatek: vcodec: add params to record lat and
 core lat_buf count

Il 10/12/22 08:32, Yunfei Dong ha scritto:
> Using lat_buf to share decoder information between lat and core work
> queue, adding params to record the buf count.
> 
> Fixes: 365e4ba01df4 ("media: mtk-vcodec: Add work queue for core hardware decode")
> Signed-off-by: Yunfei Dong <yunfei.dong@...iatek.com>
> ---
>   .../platform/mediatek/vcodec/vdec_msg_queue.c | 32 ++++++++++++++++++-
>   .../platform/mediatek/vcodec/vdec_msg_queue.h |  9 ++++++
>   2 files changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> index dc2004790a47..af7ddba1923a 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> +++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
> @@ -52,6 +52,30 @@ static struct list_head *vdec_get_buf_list(int hardware_index, struct vdec_lat_b
>   	}
>   }
>   
> +static void vdec_msg_queue_inc(struct vdec_msg_queue *msg_queue, int hardware_index)
> +{
> +	mutex_lock(&msg_queue->list_cnt_mutex);

I doubt that you need to use this mutex, as you're using atomics...

> +
> +	if (hardware_index == MTK_VDEC_CORE)
> +		atomic_inc(&msg_queue->core_list_cnt);
> +	else
> +		atomic_inc(&msg_queue->lat_list_cnt);
> +

This branch (with the relevant appropriate changes) can be simplified as

	atomic_inc(&msg_queue->list_cnt[hardware_index]);

...where list_cnt is an array, and hardware_index is an enumeration.	

> +	mutex_unlock(&msg_queue->list_cnt_mutex);
> +}
> +
> +static void vdec_msg_queue_dec(struct vdec_msg_queue *msg_queue, int hardware_index)
> +{
> +	mutex_lock(&msg_queue->list_cnt_mutex);
> +
> +	if (hardware_index == MTK_VDEC_CORE)
> +		atomic_dec(&msg_queue->core_list_cnt);
> +	else
> +		atomic_dec(&msg_queue->lat_list_cnt);

Same here.

> +
> +	mutex_unlock(&msg_queue->list_cnt_mutex);
> +}
> +

Regards,
Angelo