linux-kernel - Re: [PATCH 2/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_mem

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Message-ID: <41a2017f-5627-42fe-a624-642c3c47f436@collabora.com>
Date: Mon, 4 Mar 2024 11:05:48 +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 2/5] soc: mediatek: mtk-cmdq: Add cmdq_pkt_mem_move()
 function

Il 01/03/24 12:11, Jason-JH.Lin ha scritto:
> Add cmdq_pkt_mem_move() function to support CMDQ user making
> an instruction for moving a value from a source address to a
> destination address.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> Change-Id: I0128db6a3412303fc6da61f8a57a0c08e0c0067e

Drop Change-id please

> ---
>   drivers/soc/mediatek/mtk-cmdq-helper.c | 26 ++++++++++++++++++++++++++
>   include/linux/soc/mediatek/mtk-cmdq.h  | 10 ++++++++++
>   2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index b0cd071c4719..3a1e47ad8a41 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -299,6 +299,32 @@ int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
>   }
>   EXPORT_SYMBOL(cmdq_pkt_write_s_mask_value);
>   
> +s32 cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_addr)
> +{
> +	s32 err;
> +	const u16 tmp_reg_idx = CMDQ_THR_SPR_IDX0;
> +	const u16 swap_reg_idx = CMDQ_THR_SPR_IDX1;

s32 err at the end please

> +
> +	/* read the value of src_addr into swap_reg_idx */
> +	err = cmdq_pkt_assign(pkt, tmp_reg_idx, CMDQ_ADDR_HIGH(src_addr));
> +	if (err < 0)
> +		return err;
> +	err = cmdq_pkt_read_s(pkt, tmp_reg_idx, CMDQ_ADDR_LOW(src_addr), swap_reg_idx);
> +	if (err < 0)
> +		return err;
> +
> +	/* write the value of swap_reg_idx into dst_addr */
> +	err = cmdq_pkt_assign(pkt, tmp_reg_idx, CMDQ_ADDR_HIGH(dst_addr));
> +	if (err < 0)
> +		return err;
> +	err = cmdq_pkt_write_s(pkt, tmp_reg_idx, CMDQ_ADDR_LOW(dst_addr), swap_reg_idx);
> +	if (err < 0)
> +		return err;
> +
> +	return err;

In the documentation, you say "0 for success", so...

return 0; here :-)

> +}
> +EXPORT_SYMBOL(cmdq_pkt_mem_move);
> +
>   int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event, bool clear)
>   {
>   	struct cmdq_instruction inst = { {0} };
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index 1dae80185f9f..b6dbe2d8f16a 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -182,6 +182,16 @@ int cmdq_pkt_write_s_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
>   int cmdq_pkt_write_s_mask_value(struct cmdq_pkt *pkt, u8 high_addr_reg_idx,
>   				u16 addr_low, u32 value, u32 mask);
>   
> +/**
> + * cmdq_pkt_mem_move() - append memory move command to the CMDQ packet
> + * @pkt:	the CMDQ packet
> + * @src_addr:	source address
> + * @dma_addr_t: destination address
> + *

  * @dst_addr: destination address
  *
  * Appends a CMDQ command to copy the value found in `src_addr` to `dst_addr`
  *
  * Return ....

> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_mem_move(struct cmdq_pkt *pkt, dma_addr_t src_addr, dma_addr_t dst_addr);
> +
>   /**
>    * cmdq_pkt_wfe() - append wait for event command to the CMDQ packet
>    * @pkt:	the CMDQ packet