RE: [PATCH 2/4] firmware: imx: add resource management api

[Peng Fan <peng.fan@nxp.com>]

> Subject: RE: [PATCH 2/4] firmware: imx: add resource management api
> 
> > From: Peng Fan <peng.fan@nxp.com>
> > Sent: Thursday, April 23, 2020 3:00 PM
> >
> > 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@nxp.com>
> > Signed-off-by: Peng Fan <peng.fan@nxp.com>
> 
> Right now I'm still not quite understand if we really need this.
> As current resource is bound to power domains, if it's not owned by one
> specific SW execution environment, power on will also fail.
> Can you clarify if any exceptions?

There will be lots of failures when boot Linux domu if no check.

Thanks,
Peng.

> 
> Regards
> Aisheng
> 
> > ---
> >  drivers/firmware/imx/Makefile       |  2 +-
> >  drivers/firmware/imx/rm.c           | 40 +++++++++++++++++++++
> >  include/linux/firmware/imx/sci.h    |  1 +
> >  include/linux/firmware/imx/svc/rm.h | 69
> > +++++++++++++++++++++++++++++++++++++
> >  4 files changed, 111 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..7b0334de5486
> > --- /dev/null
> > +++ b/drivers/firmware/imx/rm.c
> > @@ -0,0 +1,40 @@
> > +// 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 success and < 0 for errors.
> > + */
> > +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;
> > +
> > +	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 17ba4e405129..b5c5a56f29be 100644
> > --- a/include/linux/firmware/imx/sci.h
> > +++ b/include/linux/firmware/imx/sci.h
> > @@ -15,6 +15,7 @@
> >
> >  #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..fc6ea62d9d0e
> > --- /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 2017-2019 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.
> > + *
> > + * RM_SVC (SVC) Resource Management Service
> > + *
> > + * Module for the Resource Management (RM) service.
> > + */
> > +
> > +#ifndef _SC_RM_API_H
> > +#define _SC_RM_API_H
> > +
> > +#include <linux/firmware/imx/sci.h>
> > +
> > +/*
> > + * This type is used to indicate RPC RM function calls.
> > + */
> > +enum imx_sc_rm_func {
> > +	IMX_SC_RM_FUNC_UNKNOWN = 0,
> > +	IMX_SC_RM_FUNC_PARTITION_ALLOC = 1,
> > +	IMX_SC_RM_FUNC_SET_CONFIDENTIAL = 31,
> > +	IMX_SC_RM_FUNC_PARTITION_FREE = 2,
> > +	IMX_SC_RM_FUNC_GET_DID = 26,
> > +	IMX_SC_RM_FUNC_PARTITION_STATIC = 3,
> > +	IMX_SC_RM_FUNC_PARTITION_LOCK = 4,
> > +	IMX_SC_RM_FUNC_GET_PARTITION = 5,
> > +	IMX_SC_RM_FUNC_SET_PARENT = 6,
> > +	IMX_SC_RM_FUNC_MOVE_ALL = 7,
> > +	IMX_SC_RM_FUNC_ASSIGN_RESOURCE = 8,
> > +	IMX_SC_RM_FUNC_SET_RESOURCE_MOVABLE = 9,
> > +	IMX_SC_RM_FUNC_SET_SUBSYS_RSRC_MOVABLE = 28,
> > +	IMX_SC_RM_FUNC_SET_MASTER_ATTRIBUTES = 10,
> > +	IMX_SC_RM_FUNC_SET_MASTER_SID = 11,
> > +	IMX_SC_RM_FUNC_SET_PERIPHERAL_PERMISSIONS = 12,
> > +	IMX_SC_RM_FUNC_IS_RESOURCE_OWNED = 13,
> > +	IMX_SC_RM_FUNC_GET_RESOURCE_OWNER = 33,
> > +	IMX_SC_RM_FUNC_IS_RESOURCE_MASTER = 14,
> > +	IMX_SC_RM_FUNC_IS_RESOURCE_PERIPHERAL = 15,
> > +	IMX_SC_RM_FUNC_GET_RESOURCE_INFO = 16,
> > +	IMX_SC_RM_FUNC_MEMREG_ALLOC = 17,
> > +	IMX_SC_RM_FUNC_MEMREG_SPLIT = 29,
> > +	IMX_SC_RM_FUNC_MEMREG_FRAG = 32,
> > +	IMX_SC_RM_FUNC_MEMREG_FREE = 18,
> > +	IMX_SC_RM_FUNC_FIND_MEMREG = 30,
> > +	IMX_SC_RM_FUNC_ASSIGN_MEMREG = 19,
> > +	IMX_SC_RM_FUNC_SET_MEMREG_PERMISSIONS = 20,
> > +	IMX_SC_RM_FUNC_IS_MEMREG_OWNED = 21,
> > +	IMX_SC_RM_FUNC_GET_MEMREG_INFO = 22,
> > +	IMX_SC_RM_FUNC_ASSIGN_PAD = 23,
> > +	IMX_SC_RM_FUNC_SET_PAD_MOVABLE = 24,
> > +	IMX_SC_RM_FUNC_IS_PAD_OWNED = 25,
> > +	IMX_SC_RM_FUNC_DUMP = 27,
> > +};
> > +
> > +#if IS_ENABLED(CONFIG_IMX_SCU)
> > +bool imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16
> > +resource); #else static inline bool
> > +imx_sc_rm_is_resource_owned(struct imx_sc_ipc *ipc, u16 resource) {
> > +	return true;
> > +}
> > +#endif
> > +#endif
> > --
> > 2.16.4