linux-kernel - Re: [PATCH v3 7/9] soc: mediatek: cmdq: add jump function

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Message-ID: <1b66c203-e0ea-79f9-6856-a9be3e410dd2@suse.com>
Date:   Mon, 21 Sep 2020 18:18:54 +0200
From:   Matthias Brugger <mbrugger@...e.com>
To:     Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, CK Hu <ck.hu@...iatek.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Houlong Wei <houlong.wei@...iatek.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        wsd_upstream@...iatek.com, HS Liao <hs.liao@...iatek.com>
Subject: Re: [PATCH v3 7/9] soc: mediatek: cmdq: add jump function



On 07/07/2020 17:45, Dennis YC Hsieh wrote:
> Add jump function so that client can jump to any address which
> contains instruction.
> 
> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@...iatek.com>

Now pushed to v5.9-next/soc

Thanks!

> ---
>   drivers/soc/mediatek/mtk-cmdq-helper.c |   13 +++++++++++++
>   include/linux/soc/mediatek/mtk-cmdq.h  |   11 +++++++++++
>   2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index b6e25f216605..d55dc3296105 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -13,6 +13,7 @@
>   #define CMDQ_POLL_ENABLE_MASK	BIT(0)
>   #define CMDQ_EOC_IRQ_EN		BIT(0)
>   #define CMDQ_REG_TYPE		1
> +#define CMDQ_JUMP_RELATIVE	1
>   
>   struct cmdq_instruction {
>   	union {
> @@ -407,6 +408,18 @@ int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
>   }
>   EXPORT_SYMBOL(cmdq_pkt_assign);
>   
> +int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr)
> +{
> +	struct cmdq_instruction inst = {};
> +
> +	inst.op = CMDQ_CODE_JUMP;
> +	inst.offset = CMDQ_JUMP_RELATIVE;
> +	inst.value = addr >>
> +		cmdq_get_shift_pa(((struct cmdq_client *)pkt->cl)->chan);
> +	return cmdq_pkt_append_command(pkt, inst);
> +}
> +EXPORT_SYMBOL(cmdq_pkt_jump);
> +
>   int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>   {
>   	struct cmdq_instruction inst = { {0} };
> diff --git a/include/linux/soc/mediatek/mtk-cmdq.h b/include/linux/soc/mediatek/mtk-cmdq.h
> index d9390d76ee14..34354e952f60 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -253,6 +253,17 @@ int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
>   int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value);
>   
>   /**
> + * cmdq_pkt_jump() - Append jump command to the CMDQ packet, ask GCE
> + *		     to execute an instruction that change current thread PC to
> + *		     a physical address which should contains more instruction.
> + * @pkt:        the CMDQ packet
> + * @addr:       physical address of target instruction buffer
> + *
> + * Return: 0 for success; else the error code is returned
> + */
> +int cmdq_pkt_jump(struct cmdq_pkt *pkt, dma_addr_t addr);
> +
> +/**
>    * cmdq_pkt_finalize() - Append EOC and jump command to pkt.
>    * @pkt:	the CMDQ packet
>    *
>