linux-kernel - Re: [PATCH v4 12/16] firmware: arm_scmi: Add message passing abstractions for transports

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Date:   Wed, 16 Jun 2021 10:14:36 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        virtualization@...ts.linux-foundation.org,
        virtio-dev@...ts.oasis-open.org, sudeep.holla@....com,
        james.quinlan@...adcom.com, f.fainelli@...il.com,
        etienne.carriere@...aro.org, vincent.guittot@...aro.org,
        souvik.chakravarty@....com, igor.skalkin@...nsynergy.com,
        peter.hilber@...nsynergy.com, alex.bennee@...aro.org,
        jean-philippe@...aro.org, mikhail.golubev@...nsynergy.com,
        anton.yakovlev@...nsynergy.com, Vasyl.Vavrychuk@...nsynergy.com,
        Andriy.Tryshnivskyy@...nsynergy.com
Subject: Re: [PATCH v4 12/16] firmware: arm_scmi: Add message passing
 abstractions for transports

On Mon, Jun 14, 2021 at 03:10:36PM +0100, Jonathan Cameron wrote:
> On Fri, 11 Jun 2021 17:59:33 +0100
> Cristian Marussi <cristian.marussi@....com> wrote:
> 
> > From: Peter Hilber <peter.hilber@...nsynergy.com>
> > 
> > Add abstractions for future transports using message passing, such as
> > virtio. Derive the abstractions from the shared memory abstractions.
> > 
> > Abstract the transport SDU through the opaque struct scmi_msg_payld.
> > Also enable the transport to determine all other required information
> > about the transport SDU.
> > 
> > Signed-off-by: Peter Hilber <peter.hilber@...nsynergy.com>
> > ---
> ...
> > diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
> > index b783ae058c8a..fa4075336580 100644
> > --- a/drivers/firmware/arm_scmi/common.h
> > +++ b/drivers/firmware/arm_scmi/common.h
> > @@ -410,6 +410,21 @@ void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem);
> >  bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem,
> >  		     struct scmi_xfer *xfer);
> >  
> > +/* declarations for message passing transports */
> > +struct scmi_msg_payld;
> > +
> > +/** Maximum overhead of message w.r.t. struct scmi_desc.max_msg_size */
> 
> Doesn't look to be kernel-doc..
> 
Right, I'll fix.

Cristian

> > +#define SCMI_MSG_MAX_PROT_OVERHEAD (2 * sizeof(__le32))