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

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Date: Tue, 26 Dec 2023 09:18:34 +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]

> +
> +/**
> + * struct iwc_cmdq_command_t - structure for excuting cmdq task in
> secure world.
> + * @thread: GCE secure thread index to execute command.
> + * @scenario: scenario to execute command.
> + * @priority: priority of GCE secure thread.
> + * @cmd_size: command size used in command buffer.
> + * @eng_flag: HW engine flag need to enable protection
> configuration.
> + * @va_base: command buffer
> + * @wait_cookie: index in thread's task list, it should be
> (nextCookie - 1).
> + * @reset_exec: reset HW thread.
> + * @caller_pid: pid of client module.
> + * @caller_name: name of client module.
> + * @metadata: metadata structure for converting a list of secure
> buffer address.
> + * @extension: extension HW engine flag to be protcted in secure
> world.
> + * @readback_pa: readback buffer pa.
> + * @normal_task_handle: handle to reference task in normal world.
> + * @mdp_extension: extension MDP HW engine flag to be protcted in
> secure world.
> + * @readback_engs: array of readback engines parameters.
> + * @readback_cnt: count of readback_engs array.
> + */
> +struct iwc_cmdq_command_t {
> +	/* basic execution data */
> +	u32 thread;
> +	u32 scenario;
> +	u32 priority;
> +	u32 cmd_size;
> +	u64 eng_flag;
> +	u32 va_base[CMDQ_IWC_MAX_CMD_LENGTH];
> +
> +	/* exec order data */
> +	u32 wait_cookie;
> +	bool reset_exec;
> +
> +	/* client info */
> +	s32 caller_pid;

Useless, drop it.

> +	char caller_name[CMDQ_IWC_CLIENT_NAME];

Ditto.

> +
> +	/* metadata */
> +	struct iwc_cmdq_metadata_t metadata;
> +
> +	/* client extension bits */
> +	u64 extension;

Ditto.

> +	u64 readback_pa;

Ditto.

> +
> +	/* debug */
> +	u64 normal_task_handle;
> +
> +	/* SVP HDR */
> +	u32 mdp_extension;

Ditto.

> +	struct readback_engine readback_engs[CMDQ_MAX_READBACK_ENG];

Ditto.

> +	u32 readback_cnt;

Ditto.

Regards,
CK

> +};
> +