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SubjectRe: [PATCH v5 11/13] soc: mediatek: cmdq: add jump function
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Hi, Dennis:

On Sun, 2020-03-08 at 18:52 +0800, Dennis YC Hsieh wrote:
> Add jump function so that client can jump to any address which
> contains instruction.
>

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> Signed-off-by: Dennis YC Hsieh <dennis-yc.hsieh@mediatek.com>
> ---
> 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 59bc1164b411..bb5be20fc70a 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 {
> @@ -372,6 +373,18 @@ 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 = { {0} };
> +
> + inst.op = CMDQ_CODE_JUMP;
> + inst.offset = CMDQ_JUMP_RELATIVE;
> + inst.value = addr >>
> + cmdq_mbox_shift(((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 99e77155f967..1a6c56f3bec1 100644
> --- a/include/linux/soc/mediatek/mtk-cmdq.h
> +++ b/include/linux/soc/mediatek/mtk-cmdq.h
> @@ -213,6 +213,17 @@ 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

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