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

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Message-ID: <d4eb25a2affed65ed30a269e4b54e8d1a671abde.camel@mediatek.com>
Date: Thu, 28 Dec 2023 07:35:15 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "jassisinghbrar@...il.com" <jassisinghbrar@...il.com>,
	"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"angelogioacchino.delregno@...labora.com"
	<angelogioacchino.delregno@...labora.com>, "robh+dt@...nel.org"
	<robh+dt@...nel.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "chunkuang.hu@...nel.org"
	<chunkuang.hu@...nel.org>
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>,
	Johnson Wang (王聖鑫) <Johnson.Wang@...iatek.com>,
	"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Jason-ch Chen (陳建豪)
	<Jason-ch.Chen@...iatek.com>, Shawn Sung (宋孝謙)
	<Shawn.Sung@...iatek.com>, "mchehab@...nel.org" <mchehab@...nel.org>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	"conor+dt@...nel.org" <conor+dt@...nel.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 v3 8/9] mailbox: mediatek: Add CMDQ secure mailbox driver

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@...iatek.com>
> ---

[snip]

> +static int cmdq_sec_session_reply(const u32 iwc_cmd, struct
> iwc_cmdq_message_t *iwc_msg,
> +				  void *data, struct cmdq_sec_task
> *sec_task)
> +{
> +	struct iwc_cmdq_cancel_task_t *cancel = data;
> +	struct cmdq_sec_data *sec_data = sec_task->task.pkt->sec_data;
> +
> +	if (iwc_cmd == CMD_CMDQ_IWC_SUBMIT_TASK && iwc_msg->rsp < 0) {
> +		/* submit fail case copy status */
> +		memcpy(&sec_data->sec_status, &iwc_msg->sec_status,
> +		       sizeof(sec_data->sec_status));

sec_data->sec_status is useless, so drop it.

> +		sec_data->response = iwc_msg->rsp;

sec_data->response is useless, so drop it.

Regards,
CK

> +	} else if (iwc_cmd == CMD_CMDQ_IWC_CANCEL_TASK && cancel) {
> +		/* cancel case only copy cancel result */
> +		memcpy(cancel, &iwc_msg->cancel_task, sizeof(*cancel));
> +	}
> +
> +	return iwc_msg->rsp;
> +}
> +