linux-kernel - Re: [PATCH RESEND, v6 6/8] mailbox: mediatek: Add CMDQ secure mailbox driver

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Date: Tue, 28 May 2024 15:33:51 +0000
From: Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>
To: CK Hu (胡俊光) <ck.hu@...iatek.com>,
	"jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>, "chunkuang.hu@...nel.org"
	<chunkuang.hu@...nel.org>, "robh+dt@...nel.org" <robh+dt@...nel.org>,
	"krzysztof.kozlowski+dt@...aro.org" <krzysztof.kozlowski+dt@...aro.org>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Singo Chang (張興國) <Singo.Chang@...iatek.com>,
	Jason-ch Chen (陳建豪)
	<Jason-ch.Chen@...iatek.com>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, Shawn Sung (宋孝謙)
	<Shawn.Sung@...iatek.com>, Nancy Lin (林欣螢)
	<Nancy.Lin@...iatek.com>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH RESEND, v6 6/8] mailbox: mediatek: Add CMDQ secure mailbox
 driver

Hi CK,

On Tue, 2024-05-28 at 03:17 +0000, CK Hu (胡俊光) wrote:
> Hi, Jason:
> 
> On Sun, 2024-05-26 at 22:44 +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.
> > 
> > TODO:
> > 1. Squash cmdq_sec_task_exec_work() into cmdq_sec_mbox_send_data().
> > 2. Call into TEE to query cookie instead of using shared memory in
> >    cmdq_sec_get_cookie().
> > 3. Register shared memory as command buffer instead of copying
> > normal
> >    command buffer to IWC shared memory.
> > 4. Use SOFTDEP to make cmdq_sec_probe later than OPTEE loaded and
> > then
> >    move cmdq_sec_session_init into cmdq_sec_probe().
> > 5. Remove timeout detection in cmdq_sec_session_send().
> > 
> > Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> > Signed-off-by: Hsiao Chien Sung <shawn.sung@...iatek.com>
> > ---
> 
> [snip]
> 
> > +/**
> > + * struct readback_engine - readback engine parameters.
> > + * @engine: HW engine flag for readback.
> > + * @start: start address pa of readback buffer.
> > + * @count: u32 size count of readback buffer.
> > + * @param: other parameters need in secure world.
> > + */
> > +struct readback_engine {
> > +	u32 engine;
> > +	u32 start;
> > +	u32 count;
> > +	u32 param;
> > +};
> 
> Useless, so drop it.
> 
OK, I'll drop this.

Regards,
Jason-JH.Lin

> Regards,
> CK