linux-kernel - Re: [PATCH 10/12] platform/early: implement support for early platform drivers

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Date:   Tue, 15 May 2018 16:06:15 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        David Lechner <david@...hnology.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Peter Rosin <peda@...ntia.se>, Jiri Slaby <jslaby@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Johan Hovold <johan@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        "open list:GENERIC INCLUDE/ASM HEADER FILES" 
        <linux-arch@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 10/12] platform/early: implement support for early
 platform drivers

2018-05-14 15:37 GMT+02:00 Rob Herring <robh+dt@...nel.org>:
> On Fri, May 11, 2018 at 11:20 AM, Bartosz Golaszewski <brgl@...ev.pl> wrote:
>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>
>> This introduces the core part of support for early platform drivers
>> and devices.
>>
>
> It looks like most of your prep patches are to separate the alloc and
> init of platform devices because you are essentially making early
> devices/drivers a sub-class. Maybe you could avoid doing that and
> simplify things a bit. Comments below based on doing that...
>

My aim was to change as little as possible for everybody else while
fixing our problem. These changes are already controversial enough
without risky reusing of existing fields in common structures. I was
just afraid that there are too many intricacies for it to be safe.

>> +/**
>> + * struct early_platform_driver
>> + *
>> + * @pdrv: real platform driver associated with this early platform driver
>> + * @list: list head for the list of early platform drivers
>> + * @early_probe: early probe callback
>> + */
>> +struct early_platform_driver {
>> +       struct platform_driver pdrv;
>> +       struct list_head list;
>
> Couldn't you use an existing list in driver_private until you move
> over to the normal bus infra.
>

This is something that the previous implementation did. It was quite
unreadable, so I decided to go with a separate list.

>> +       int (*early_probe)(struct platform_device *);
>
> Just add this to platform_driver.
>

This would extend the structure for everybody else while there'll be
very few such devices and not all systems would even require it.

>> +};
>> +
>> +/**
>> + * struct early_platform_device
>> + *
>> + * @pdev: real platform device associated with this early platform device
>> + * @list: list head for the list of early platform devices
>> + * @deferred: true if this device's early probe was deferred
>> + * @deferred_drv: early platform driver with which this device was matched
>> + */
>> +struct early_platform_device {
>> +       struct platform_device pdev;
>> +       struct list_head list;
>
> Use a list in device_private?
>
>> +       bool deferred;
>> +       struct early_platform_driver *deferred_drv;
>
> Can't you use the existing deferred probe list?
>

I thought about it, but I was afraid there could be some timing issues
with that and decided against it. The early deferral also doesn't work
in a workque, but is synchronous instead.

Best regards,
Bartosz Golaszewski