linux-kernel - Re: [PATCH 4/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_acquire

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Message-ID: <3dab3afd-7d0c-4bf1-b4f6-984f8d5d2d02@collabora.com>
Date: Mon, 4 Mar 2024 11:05:56 +0100
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
 Jassi Brar <jassisinghbrar@...il.com>,
 Chun-Kuang Hu <chunkuang.hu@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>
Cc: Jason-ch Chen <jason-ch.chen@...iatek.com>,
 Singo Chang <singo.chang@...iatek.com>, Nancy Lin <nancy.lin@...iatek.com>,
 Shawn Sung <shawn.sung@...iatek.com>, 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 4/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_acquire_event()
 function

Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
> Add cmdq_pkt_acquire_event() function to support CMDQ user making
> an instruction for acquiring event.
> 
> CMDQ users can use cmdq_pkt_acquire_event() and cmdq_pkt_clear_event()
> to acquire GCE event and release GCE event and achieve the MUTEX_LOCK
> protection between GCE threads.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Change-Id: Icdae6b60345c7ec1d7541ac76d1f06da56959cde

Drop Change-Id please.

> ---
>   drivers/soc/mediatek/mtk-cmdq-helper.c | 15 +++++++++++++++
>   include/linux/soc/mediatek/mtk-cmdq.h  |  9 +++++++++
>   2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index 2e9fc9bb1183..0183b40a0eff 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -342,6 +342,21 @@ int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear)
>   }
>   EXPORT_SYMBOL(cmdq_pkt_wfe);
>   
> +int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event)
> +{
> +	struct cmdq_instruction inst = {};
> +
> +	if (event >= CMDQ_MAX_EVENT)
> +		return -EINVAL;
> +
> +	inst.op = CMDQ_CODE_WFE;
> +	inst.value = CMDQ_WFE_UPDATE | CMDQ_WFE_UPDATE_VALUE | CMDQ_WFE_WAIT;
> +	inst.event = event;
> +
> +	return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_acquire_event);
> +
>   int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
>   {
>   	struct cmdq_instruction inst = { {0} };
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 2fe9be240fbc..de93c0a8e8a9 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -202,6 +202,15 @@ int cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_
>    */
>   int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear);
>   
> +/**
> + * cmdq_pkt_acquire_event() - append acquire event command to the CMDQ packet
> + * @pkt:	the CMDQ packet
> + * @event:	the desired event to be acquired

What you wrote in the commit message is good documentation for this function,
please also put it here in kerneldoc format as a documentation paragraph.

> + *
> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_acquire_event(struct cmdq_pkt *pkt, u16 event);
> +
>   /**
>    * cmdq_pkt_clear_event() - append clear event command to the CMDQ packet
>    * @pkt:	the CMDQ packet