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

[Aisheng Dong <aisheng.dong@nxp.com>]

> From: Peng Fan <peng.fan@nxp.com>
> Sent: Thursday, April 23, 2020 6:57 PM
> > > 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.
> 

What kind of features did you mean? 
Could you clarify a bit more? I'd like to understand this issue better.

Regards
Aisheng

> 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