linux-kernel - RE: [PATCH V2 2/3] firmware: imx: add resource management api

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Date:   Thu, 4 Jun 2020 08:16:05 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        Leonard Crestez <leonard.crestez@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        Joakim Zhang <qiangqing.zhang@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 2/3] firmware: imx: add resource management api

> From: Peng Fan <peng.fan@....com>
> Sent: Wednesday, June 3, 2020 11:32 AM
> 
> Add resource management API, when we have multiple partition running
> together, resources not owned to current partition should not be used.
> 
> Reviewed-by: Leonard Crestez <leonard.crestez@....com>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/firmware/imx/Makefile       |  2 +-
>  drivers/firmware/imx/rm.c           | 45 ++++++++++++++++++++++++
>  include/linux/firmware/imx/sci.h    |  1 +
>  include/linux/firmware/imx/svc/rm.h | 69
> +++++++++++++++++++++++++++++++++++++
>  4 files changed, 116 insertions(+), 1 deletion(-)  create mode 100644
> drivers/firmware/imx/rm.c  create mode 100644
> include/linux/firmware/imx/svc/rm.h
> 
> diff --git a/drivers/firmware/imx/Makefile b/drivers/firmware/imx/Makefile
> index 08bc9ddfbdfb..17ea3613e142 100644
> --- a/drivers/firmware/imx/Makefile
> +++ b/drivers/firmware/imx/Makefile
> @@ -1,4 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0
>  obj-$(CONFIG_IMX_DSP)		+= imx-dsp.o
> -obj-$(CONFIG_IMX_SCU)		+= imx-scu.o misc.o imx-scu-irq.o
> +obj-$(CONFIG_IMX_SCU)		+= imx-scu.o misc.o imx-scu-irq.o rm.o
>  obj-$(CONFIG_IMX_SCU_PD)	+= scu-pd.o
> diff --git a/drivers/firmware/imx/rm.c b/drivers/firmware/imx/rm.c new file
> mode 100644 index 000000000000..a12db6ff323b
> --- /dev/null
> +++ b/drivers/firmware/imx/rm.c
> @@ -0,0 +1,45 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2020 NXP
> + *
> + * File containing client-side RPC functions for the RM service. These
> + * function are ported to clients that communicate to the SC.
> + */
> +
> +#include <linux/firmware/imx/svc/rm.h>
> +
> +struct imx_sc_msg_rm_rsrc_owned {
> +	struct imx_sc_rpc_msg hdr;
> +	u16 resource;
> +} __packed __aligned(4);
> +
> +/*
> + * This function check @resource is owned by current partition or not
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in]     resource    resource the control is associated with
> + *
> + * @return Returns 0 for not owned and 1 for owned.
> + */
> +bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource)
> +{
> +	struct imx_sc_msg_rm_rsrc_owned msg;
> +	struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +
> +	hdr->ver = IMX_SC_RPC_VERSION;
> +	hdr->svc = IMX_SC_RPC_SVC_RM;
> +	hdr->func = IMX_SC_RM_FUNC_IS_RESOURCE_OWNED;
> +	hdr->size = 2;
> +
> +	msg.resource = resource;
> +
> +	/*
> +	 * SCU firmware only returns value 0 or 1
> +	 * for resource owned check which means not owned or owned.
> +	 * So it is always successful.
> +	 */
> +	imx_scu_call_rpc(ipc, &msg, true);
> +
> +	return hdr->func;
> +}
> +EXPORT_SYMBOL(imx_sc_rm_is_resource_owned);
> diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
> index 3fa418a4ca67..3c459f54a88f 100644
> --- a/include/linux/firmware/imx/sci.h
> +++ b/include/linux/firmware/imx/sci.h
> @@ -14,6 +14,7 @@
> 
>  #include <linux/firmware/imx/svc/misc.h>  #include
> <linux/firmware/imx/svc/pm.h>
> +#include <linux/firmware/imx/svc/rm.h>
> 
>  int imx_scu_enable_general_irq_channel(struct device *dev);  int
> imx_scu_irq_register_notifier(struct notifier_block *nb); diff --git
> a/include/linux/firmware/imx/svc/rm.h b/include/linux/firmware/imx/svc/rm.h
> new file mode 100644
> index 000000000000..9924216f3e45
> --- /dev/null
> +++ b/include/linux/firmware/imx/svc/rm.h
> @@ -0,0 +1,69 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2016 Freescale Semiconductor, Inc.
> + * Copyright 2017-2020 NXP
> + *
> + * Header file containing the public API for the System Controller (SC)
> + * Power Management (PM) function. This includes functions for power
> +state
> + * control, clock control, reset control, and wake-up event control.

Fix the code comments.
Otherwise:
Dong Aisheng <aisheng.dong@....com>

Regards
Aisheng