linux-arm-kernel.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
From: Cristian Marussi <cristian.marussi@arm.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, sudeep.holla@arm.com,
	james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com,
	etienne.carriere@linaro.org, vincent.guittot@linaro.org,
	souvik.chakravarty@arm.com
Subject: Re: [PATCH 4/4] firmware: arm_scmi: Introduce delegated xfers support
Date: Wed, 26 May 2021 15:53:17 +0100	[thread overview]
Message-ID: <20210526145317.GQ28060@e120937-lin> (raw)
In-Reply-To: <659c2f2c-e236-1a70-44be-c5f6871868e7@gmail.com>

On Mon, May 24, 2021 at 07:20:45PM -0700, Florian Fainelli wrote:
> 
> 
> On 5/24/2021 4:15 PM, Cristian Marussi wrote:
> > Introduce optional support for delegated xfers allocation.
> > 
> > An SCMI transport can optionally declare to support delegated xfers and
> > then use a few helper functions exposed by the core SCMI transport layer to
> > query the core for existing in-flight transfers matching a provided message
> > header or alternatively and transparently obtain a brand new xfer to handle
> > a freshly received notification message.
> > In both cases the obtained xfer is uniquely mapped into a specific xfer
> > through the means of the message header acting as key.
> > 
> > In this way such a transport can properly store its own transport specific
> > payload into the xfer uniquely associated to the message header before
> > even calling into the core scmi_rx_callback() in the usual way, so that
> > the transport specific message envelope structures can be freed early
> > and there is no more need to keep track of their status till the core
> > fully processes the xfer to completion or times out.
> > 
> > The scmi_rx_callbak() does not need to be modified to carry additional
> > transport-specific ancillary data related to such message envelopes since
> > an unique natural association is established between the xfer and the
> > related message header.
> > 
> > Existing transports that do not need anything of the above will continue
> > to work as before without any change.
> > 
> > Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> 
> It would be better to see this in the context of its planned user, but
> that looked reasonable enough.

I agree, definitely better to see this in the context of usage.

Such virtio-scmi rework is still in progress indeed, but working in my
local testing so far.

The reworked V4 virtio-scmi series is still to be refined and posted,
and this transitional code lives now at:

https://gitlab.arm.com/linux-arm/linux-cm/-/tree/scmi_virtio_trans_V4_rework

and in particular this is the patch that changes virtio-scmi transport to
use the new delegated xfers. (hopefully simplfying it)

https://gitlab.arm.com/linux-arm/linux-cm/-/commit/0b524f89ea6cfcf6204a5eaa8cf9030118805b2f

...but, as said, it is highly work in progress so you may just want to
wait for final V4 virtio-scmi rework posted and do not bother this noise
of mine :D

In any case thanks a lot for the feedback so far.

Cristian

> -- 
> Florian


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

      reply	other threads:[~2021-05-26 16:08 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-24 23:14 [PATCH 0/4] Review/Extend SCMI Transport Core layer Cristian Marussi
2021-05-24 23:15 ` [PATCH 1/4] firmware: arm_scmi: reset_rx_to_maxsz during async commands Cristian Marussi
2021-05-24 23:15 ` [PATCH 2/4] firmware: arm_scmi: Add support for type handling in common functions Cristian Marussi
2021-05-25  1:53   ` Florian Fainelli
2021-05-24 23:15 ` [PATCH 3/4] firmware: arm_scmi: Introduce monotonically increasing tokens Cristian Marussi
2021-05-25  2:13   ` Florian Fainelli
2021-05-26 14:44     ` Cristian Marussi
     [not found]   ` <CA+-6iNx-EoMUhOncrgYTxh52mW_7yjjBbfHK8mVyEY0Uw4piwg@mail.gmail.com>
2021-05-26 14:45     ` Cristian Marussi
2021-05-24 23:15 ` [PATCH 4/4] firmware: arm_scmi: Introduce delegated xfers support Cristian Marussi
2021-05-25  2:20   ` Florian Fainelli
2021-05-26 14:53     ` Cristian Marussi [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210526145317.GQ28060@e120937-lin \
    --to=cristian.marussi@arm.com \
    --cc=Jonathan.Cameron@Huawei.com \
    --cc=etienne.carriere@linaro.org \
    --cc=f.fainelli@gmail.com \
    --cc=james.quinlan@broadcom.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=souvik.chakravarty@arm.com \
    --cc=sudeep.holla@arm.com \
    --cc=vincent.guittot@linaro.org \
    --subject='Re: [PATCH 4/4] firmware: arm_scmi: Introduce delegated xfers support' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).