linux-kernel - Re: [PATCH] firmware: imx: add get resource owner api

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Message-ID: <20220128085633.GG4686@dragon>
Date:   Fri, 28 Jan 2022 16:56:34 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc:     s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] firmware: imx: add get resource owner api

On Tue, Jan 11, 2022 at 11:21:47AM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Add resource owner management API, this API could be used to check
> whether M4 is under control of Linux.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/firmware/imx/rm.c           | 45 +++++++++++++++++++++++++++++
>  include/linux/firmware/imx/svc/rm.h |  5 ++++
>  2 files changed, 50 insertions(+)
> 
> diff --git a/drivers/firmware/imx/rm.c b/drivers/firmware/imx/rm.c
> index a12db6ff323b..3c3605f98123 100644
> --- a/drivers/firmware/imx/rm.c
> +++ b/drivers/firmware/imx/rm.c
> @@ -43,3 +43,48 @@ bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
>  	return hdr->func;
>  }
>  EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
> +
> +/*
> + * This function get @resource partition number
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in]     resource    resource the control is associated with
> + * @param[out]    pt          pointer to return the partition number
> + *
> + * @return Returns 0 for success and < 0 for errors.
> + */

Shouldn't the documentation be put right above the function?

Shawn

> +struct imx_sc_msg_rm_get_resource_owner {
> +	struct imx_sc_rpc_msg hdr;
> +	union {
> +		struct {
> +			u16 resource;
> +		} req;
> +		struct {
> +			u8 val;
> +		} resp;
> +	} data;
> +} __packed __aligned(4);
> +
> +int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)
> +{
> +	struct imx_sc_msg_rm_get_resource_owner msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +	int ret;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_RM;
> +	hdr->func = IMX_SC_RM_FUNC_GET_RESOURCE_OWNER;
> +	hdr->size = 2;
> +
> +	msg.data.req.resource = resource;
> +
> +	ret = imx_scu_call_rpc(ipc, &msg, true);
> +	if (ret)
> +		return ret;
> +
> +	if (pt)
> +		*pt = msg.data.resp.val;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(imx_sc_rm_get_resource_owner);
> diff --git a/include/linux/firmware/imx/svc/rm.h b/include/linux/firmware/imx/svc/rm.h
> index 456b6a59d29b..ff481b23ea36 100644
> --- a/include/linux/firmware/imx/svc/rm.h
> +++ b/include/linux/firmware/imx/svc/rm.h
> @@ -59,11 +59,16 @@ enum imx_sc_rm_func {
>  
>  #if IS_ENABLED(CONFIG_IMX_SCU)
>  bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource);
> +int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt);
>  #else
>  static inline bool
>  imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
>  {
>  	return true;
>  }
> +static inline int imx_sc_rm_get_resource_owner(struct imx_sc_ipc *ipc, u16 resource, u8 *pt)
> +{
> +	return -ENOTSUPP;
> +}
>  #endif
>  #endif
> -- 
> 2.25.1
>