linux-kernel - Re: [PATCH 03/15] soc: mediatek: Support GCE thread loop

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Message-ID: <3813feae1052428045e9897694521e790974d3a7.camel@mediatek.com>
Date:   Wed, 30 Aug 2023 02:15:07 +0000
From:   CK Hu (胡俊光) <ck.hu@...iatek.com>
To:     "chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>,
        Shawn Sung (宋孝謙) 
        <Shawn.Sung@...iatek.com>, "daniel@...ll.ch" <daniel@...ll.ch>,
        "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
        "airlied@...il.com" <airlied@...il.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Jason-JH Lin (林睿祥) 
        <Jason-JH.Lin@...iatek.com>,
        Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
        Singo Chang (張興國) 
        <Singo.Chang@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH 03/15] soc: mediatek: Support GCE thread loop

Hi, Hsiao-chien:

On Wed, 2023-08-23 at 23:13 +0800, Hsiao Chien Sung wrote:
> Add a new API to create GCE thread loop by
> appending a command at the end of CMDQ packet
> to jump to the head of it.
> 
> Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 30
> ++++++++++++++++++++++++++
>  include/linux/soc/mediatek/mtk-cmdq.h  |  2 ++
>  2 files changed, 32 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index c1837a468267..7d503d491c0d 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -430,6 +430,9 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
>  	int err;
>  	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;
>  
> +	dma_sync_single_for_device(client->chan->mbox->dev, pkt-
> >pa_base,
> +				   pkt->cmd_buf_size, DMA_TO_DEVICE);

This function has been called by client driver, so drop this.

Regards,
CK

> +
>  	err = mbox_send_message(client->chan, pkt);
>  	if (err < 0)
>  		return err;
> @@ -440,4 +443,31 @@ int cmdq_pkt_flush_async(struct cmdq_pkt *pkt)
>  }
>  EXPORT_SYMBOL(cmdq_pkt_flush_async);
>  
> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt)
> +{
> +	struct cmdq_instruction inst = { {0} };
> +	int err;
> +	u8 shift_pa = 0;
> +
> +	shift_pa = cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)-
> >chan);
> +
> +	/* insert EOC and generate IRQ for command iteration */
> +	inst.op = CMDQ_CODE_EOC;
> +	inst.value = CMDQ_EOC_IRQ_EN;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +	if (err < 0)
> +		return err;
> +
> +	/* jump to head of the packet */
> +	inst.op = CMDQ_CODE_JUMP;
> +	inst.offset = CMDQ_JUMP_RELATIVE;
> +	inst.value = pkt->pa_base >> shift_pa;
> +	err = cmdq_pkt_append_command(pkt, inst);
> +
> +	pkt->loop = true;
> +
> +	return err;
> +}
> +EXPORT_SYMBOL(cmdq_pkt_finalize_loop);
> +
>  MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h
> b/include/linux/soc/mediatek/mtk-cmdq.h
> index 3eb95ef34c6c..4c30f891d924 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -273,6 +273,8 @@ int cmdq_pkt_jump(struct cmdq_pkt *pkt,
> dma_addr_t addr);
>   */
>  int cmdq_pkt_finalize(struct cmdq_pkt *pkt);
>  
> +int cmdq_pkt_finalize_loop(struct cmdq_pkt *pkt);
> +
>  /**
>   * cmdq_pkt_flush_async() - trigger CMDQ to asynchronously execute
> the CMDQ
>   *                          packet and call back at the end of done
> packet