Re: [PATCH 11/15] soc: mediatek: Add cmdq_insert_backup_cookie before EOC for secure pkt

[CK Hu (胡俊光)]

Hi, Jason:

On Tue, 2023-09-19 at 03:22 +0800, Jason-JH.Lin wrote:
> Add cmdq_insert_backup_cookie to append some commands before EOC:
> 1. Get GCE HW thread execute count from the GCE HW register.
> 2. Add 1 to the execute count and then store into a shared memory.
> 3. Set a software event siganl as secure irq to GCE HW.
> 
> Since the value of execute count + 1 is stored in a shared memory,
> CMDQ driver in the normal world can use it to handle task done in irq
> handler and CMDQ driver in the secure world will use it to schedule
> the task slot for each secure thread.
> 
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>
> ---
>  drivers/soc/mediatek/mtk-cmdq-helper.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/soc/mediatek/mtk-cmdq-helper.c
> b/drivers/soc/mediatek/mtk-cmdq-helper.c
> index bbb127620bb3..7b5392878aba 100644
> --- a/drivers/soc/mediatek/mtk-cmdq-helper.c
> +++ b/drivers/soc/mediatek/mtk-cmdq-helper.c
> @@ -8,6 +8,7 @@
>  #include <linux/module.h>
>  #include <linux/mailbox_controller.h>
>  #include <linux/of.h>
> +#include <linux/mailbox/mtk-cmdq-sec-mailbox.h>
>  #include <linux/soc/mediatek/mtk-cmdq.h>
>  
>  #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
> @@ -153,7 +154,9 @@ void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
>  
>  	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt-
> >buf_size,
>  			 DMA_TO_DEVICE);
> +
>  	kfree(pkt->va_base);
> +	kfree(pkt->sec_data);
>  	kfree(pkt);
>  }
>  EXPORT_SYMBOL(cmdq_pkt_destroy);
> @@ -458,6 +461,12 @@ int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
>  	struct cmdq_instruction inst = { {0} };
>  	int err;
>  
> +	if (pkt->sec_data) {
> +		err = cmdq_sec_insert_backup_cookie(pkt);
> +		if (err < 0)
> +			return err;
> +	}

Client driver could directly call cmdq_sec_insert_backup_cookie()
before call cmdq_pkt_finalize(). I would like helper provide simple API
and client driver would integrate simple API to what they want.

Regards,
CK

> +
>  	/* insert EOC and generate IRQ for each command iteration */
>  	inst.op = CMDQ_CODE_EOC;
>  	inst.value = CMDQ_EOC_IRQ_EN;