Re: [PATCH v3 8/9] mailbox: mediatek: Add CMDQ secure mailbox driver

CK Hu (胡俊光)
2023-12-26T07:58:26Z

Hi, Jason:

On Fri, 2023-12-22 at 12:52 +0800, Jason-JH.Lin wrote:
> To support secure video path feature, GCE have to read/write
> registgers
> in the secure world. GCE will enable the secure access permission to
> the
> HW who wants to access the secure content buffer.
>
> Add CMDQ secure mailbox driver to make CMDQ client user is able to
> sending their HW settings to the secure world. So that GCE can
> execute
> all instructions to configure HW in the secure world.
>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
> ---

[snip]

> +
> +static u32 cmdq_sec_get_cookie(struct cmdq_sec *cmdq, u32 idx)
> +{
> + return *(u32 *)(cmdq->shared_mem->va +
> + CMDQ_SEC_SHARED_THR_CNT_OFFSET + idx * sizeof(u32));
> +}

cmdq_sec_get_cookie() is called in normal context not irq context, so
we could allow a function call into TEE to query cookie even though the
function call would take time. Therefore, it's not necessary to use a
cmdq command to copy cookie value into share memory.

Regards,
CK