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

Jason-JH Lin (林睿祥)
2023-12-27T06:15:45Z

Hi CK,

Thanks for the reviews.

On Tue, 2023-12-26 at 07:57 +0000, CK Hu (胡俊光) wrote:
> 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

OK, I will try it and see if we can remove this share memory.

Regards,
Jason-JH.Lin