linux-kernel - Re: [PATCH v4 09/14] mailbox: Add Gunyah message queue mailbox

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Message-ID: <20220929165908.zgmlujhp42ihine5@builder.lan>
Date:   Thu, 29 Sep 2022 11:59:08 -0500
From:   Bjorn Andersson <andersson@...nel.org>
To:     Elliot Berman <quic_eberman@...cinc.com>
Cc:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 09/14] mailbox: Add Gunyah message queue mailbox

On Wed, Sep 28, 2022 at 12:56:28PM -0700, Elliot Berman wrote:
[..]
> diff --git a/drivers/mailbox/gunyah-msgq.c b/drivers/mailbox/gunyah-msgq.c
[..]
> +static int gh_msgq_send_data(struct mbox_chan *chan, void *data)
> +{
> +	struct gunyah_msgq *msgq = mbox_chan_to_msgq(chan);
> +	struct gunyah_msgq_tx_data *msgq_data = data;

The mailbox framework abstracts hardware mailboxes and @data
should be the data to be written to the hardware.

Using the void * to pass composite data types means that the client and
provider are tightly coupled and as such the mailbox framework does not
provide you any abstraction.

You also only expose a single channel, so a direct function call between
the two specific drivers would be a better fit.

Regards,
Bjorn