linux-kernel - Re: [PATCH 04/10] uapi: Add ARM SCMI definitions

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Message-ID: <aPdVKtKWNqB5dzkE@pluto>
Date: Tue, 21 Oct 2025 10:40:58 +0100
From: Cristian Marussi <cristian.marussi@....com>
To: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: Cristian Marussi <cristian.marussi@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	arm-scmi@...r.kernel.org, sudeep.holla@....com,
	james.quinlan@...adcom.com, f.fainelli@...il.com,
	vincent.guittot@...aro.org, etienne.carriere@...com,
	peng.fan@....nxp.com, michal.simek@....com, quic_sibis@...cinc.com,
	dan.carpenter@...aro.org, d-gole@...com, souvik.chakravarty@....com
Subject: Re: [PATCH 04/10] uapi: Add ARM SCMI definitions

On Fri, Oct 17, 2025 at 04:14:01PM +0100, Jonathan Cameron wrote:
> On Thu, 25 Sep 2025 21:35:48 +0100
> Cristian Marussi <cristian.marussi@....com> wrote:
> 
> > Add a number of structures and ioctls definitions used by the ARM
> > SCMI Telemetry protocol.
> > 
> > Signed-off-by: Cristian Marussi <cristian.marussi@....com>
> Hi Cristian,
> 

Hi,

> Main thing in here is request to add __counted_by markings for the flexible array members.

...right...missed that completely...

> 
> >  SYSTEM CONTROL MANAGEMENT INTERFACE (SCMI) i.MX Extension Message Protocol drivers
> > diff --git a/include/uapi/linux/scmi.h b/include/uapi/linux/scmi.h
> > new file mode 100644
> > index 000000000000..b1a6d34fee4a
> > --- /dev/null
> > +++ b/include/uapi/linux/scmi.h
> > @@ -0,0 +1,286 @@
> 
> > +
> > +/**
> > + * scmi_tlm_config  - Whole instance or group configuration
> > + *
> > + * @enable: Enable/Disable Telemetry for the whole instance or the group
> > + * @t_enable: Enable/Disable timestamping for all the DEs belonging to a group.
> I'm fairly sure that even for reserved the kernel-doc script will complain if no
> documentation.  (I haven't checked if it special cases that though!)

Right..

> > + * @current_update_interval: Get/Set currently active update interval for the
> > + *			     whole instance or a group.
> > + *
> > + * Used by:
> > + *	RO - SCMI_TLM_GET_CFG
> > + *	WO - SCMI_TLM_SET_CFG
> > + *
> > + * Supported by:
> > + *	control/
> > + *	groups/<N>/control
> > + */
> > +struct scmi_tlm_config {
> > +	__u8 enable;
> > +	__u8 t_enable;
> > +	__u8 reserved[2];
> > +	__u32 current_update_interval;
> > +};
> 
> > +/**
> > + * scmi_tlm_grps_list  - DE-groups List
> > + *
> > + * @num_grps: Number of entries returned in @grps
> > + * @grps: An array containing descriptors for all defined DE Groups
> > + *
> > + * Used by:
> > + *	RW - SCMI_TLM_GET_GRP_LIST
> > + *
> > + * Supported by:
> > + *	control/
> > + */
> > +struct scmi_tlm_grps_list {
> > +	__u32 num_grps;
> > +	struct scmi_tlm_grp_info grps[];
> 
> As below on __counted_by

I will add.

> 
> > +};
> > +
> > +/**
> > + * scmi_tlm_grp_desc  - Group descriptor
> > + *
> > + * @num_des: Number of DEs part of this group
> > + * @composing_des: An array containing the DE IDs that belongs to this group.
> > + *
> > + * Used by:
> > + *	RW - SCMI_TLM_GET_GRP_DESC
> > + *
> > + * Supported by:
> > + *	groups/<N>control/
> > + */
> > +struct scmi_tlm_grp_desc {
> > +	__u32 num_des;
> > +	__u32 composing_des[];
> 
> If we can give this a __counted_by marking please do.
>

I will.

Thanks,
Cristian