linux-kernel - Re: [RFC PATCH v2 12/12] gpiolib: Add fast processing path to bitmap API functions

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Date:   Tue, 07 Aug 2018 19:29:53 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Jonathan Corbet <corbet@....net>,
        Miquèl Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Mark Vasut <marek.vasut@...il.com>,
        ext Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        linux-mtd@...ts.infradead.org, linux-doc@...r.kernel.org,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: Re: [RFC PATCH v2 12/12] gpiolib: Add fast processing path to bitmap API functions

On Tuesday, August 7, 2018 1:43:56 AM CEST Linus Walleij wrote:
> On Tue, Aug 7, 2018 at 12:29 AM Janusz Krzysztofik <jmkrzyszt@...il.com> 
wrote:
> 
> Hi Janusz!
> 
> > Certain GPIO descriptor arrays returned by gpio_get_array() may contain
> > information on a single GPIO chip driving array member pins in hardware
> > order.  In such cases, bitmaps of values can be passed directly to the
> > chip callback functions without wasting time on iterations.
> >
> > Add respective code to gpiod_get/set_array_bitmap_complex() functions.
> >
> > Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
> 
> I think it would be disappointing to leave all the users of the old
> array API without the performance improvement. I think we need to
> deal with this in a way such that everyone can benefit from it.

There are a few issues to be resolved:

1) array size limited by bitmap size:
    - are we ready to limit array size to a single bitmap for all users?
    - if not, how can we pass a bitmap of an arbitrary size?
    - if as an array of bitmaps, is that still clear enough and easy to use?
    - other ideas?

2) arbitrary array support:
     - are we ready to drop that?
     - if not, do we agree to require all users to pack their arbitrary arrays 
        inside the gpio_descs structure?

Maybe more.

> Also it is kludgy if users (consumers) would need to handle the case
> where all lines are on the same chip separately, through the bitmap
> API.

Not true as long as array size fits (arbitrary arrays can be packed by users), 
but I see your point.

> What we need is an API that:
> 
> - All drivers handling arrays can use (including current users).
> 
> - Enables speed-up if the lines are all on the same chip/register.
> 
> - Doesn't require consumers to know if they are all on the same
>   chip or not.
> 
> This means a deep API with a small surface.
> 
> How do we achieve this the best way?

I think widely accepted solutions to those two issues I've mentioned above can 
give the answer.

Thanks,
Janusz