linux-kernel - Re: [PATCHv10 2/4] mailbox: Introduce framework for mailbox

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Message-ID: <CAJ5Y-eZ5gNMQ2YRN4iS5QTU7qUrgxGdTHXhQZ_2ut4iBsEZHGg@mail.gmail.com>
Date:	Mon, 22 Sep 2014 14:01:08 -0400
From:	Ashwin Chaugule <ashwin.chaugule@...aro.org>
To:	Jassi Brar <jaswinder.singh@...aro.org>
Cc:	Devicetree List <devicetree@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"ks.giri@...sung.com" <ks.giri@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	Matt Porter <mporter@...aro.org>,
	Craig McGeachie <slapdau@...oo.com.au>,
	LeyFoon Tan <lftan.linux@...il.com>,
	Loic Pallardy <loic.pallardy@...com>,
	"Anna, Suman" <s-anna@...com>, Bjorn Andersson <bjorn@...o.se>,
	Patch Tracking <patches@...aro.org>, mollie.wu@...aro.org,
	Tetsuya Takinishi <t.takinishi@...fujitsu.com>,
	broonie@...aro.org, Kevin Hilman <khilman@...aro.org>,
	lee.jones@...aro.org, andy.green@...aro.org
Subject: Re: [PATCHv10 2/4] mailbox: Introduce framework for mailbox

Hi Jassi,

On 1 August 2014 08:31, Jassi Brar <jaswinder.singh@...aro.org> wrote:
> Introduce common framework for client/protocol drivers and
> controller drivers of Inter-Processor-Communication (IPC).
>
> Client driver developers should have a look at
>  include/linux/mailbox_client.h to understand the part of
> the API exposed to client drivers.
> Similarly controller driver developers should have a look
> at include/linux/mailbox_controller.h
>
> Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
> ---
>  MAINTAINERS                        |   8 +
>  drivers/mailbox/Makefile           |   4 +
>  drivers/mailbox/mailbox.c          | 466 +++++++++++++++++++++++++++++++++++++
>  include/linux/mailbox_client.h     |  46 ++++
>  include/linux/mailbox_controller.h | 135 +++++++++++
>  5 files changed, 659 insertions(+)
>  create mode 100644 drivers/mailbox/mailbox.c
>  create mode 100644 include/linux/mailbox_client.h
>  create mode 100644 include/linux/mailbox_controller.h
>

[..]

> +
> +static void poll_txdone(unsigned long data)
> +{
> +       struct mbox_controller *mbox = (struct mbox_controller *)data;
> +       bool txdone, resched = false;
> +       int i;
> +
> +       for (i = 0; i < mbox->num_chans; i++) {
> +               struct mbox_chan *chan = &mbox->chans[i];
> +
> +               if (chan->active_req && chan->cl) {
> +                       resched = true;
> +                       txdone = chan->mbox->ops->last_tx_done(chan);
> +                       if (txdone)
> +                               tx_tick(chan, 0);
> +               }
> +       }
> +
> +       if (resched)
> +               mod_timer(&mbox->poll, jiffies +
> +                               msecs_to_jiffies(mbox->period));

While preparing a different patch which uses the Mbox framework, I
noticed that mbox->period might not be initialized anywhere. Also, how
is mbox->txpoll_period to be used? It appears from the description of
txpoll_period in mbox_controller.h that you'd want to use that value
in the mod_timer above, or equate the two somewhere in the controller
registration or eliminate one of the two. FWIW I also looked at your
code in [1].


Thanks,
Ashwin

[1] - http://git.linaro.org/landing-teams/working/fujitsu/integration.git/shortlog/refs/heads/mailbox-for-next
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