From: Florian Fainelli <f.fainelli@gmail.com>
To: Cristian Marussi <cristian.marussi@arm.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: 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: Mon, 24 May 2021 19:20:45 -0700 [thread overview]
Message-ID: <659c2f2c-e236-1a70-44be-c5f6871868e7@gmail.com> (raw)
In-Reply-To: <20210524231503.34924-5-cristian.marussi@arm.com>
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.
--
Florian
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next prev parent reply other threads:[~2021-05-25 3:47 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 [this message]
2021-05-26 14:53 ` Cristian Marussi
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