linux-kernel - Re: [Nouveau] [PATCH nouveau 09/11] drm: export some variable and functions to resue the PM functions

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Message-ID: <CAAVeFuK-SgUbtHADX4-pXN5_ayzvEd+1KxJOBcRe2tmDfHaLEA@mail.gmail.com>
Date:	Mon, 5 Jan 2015 20:50:18 +0100
From:	Alexandre Courbot <gnurou@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Vince Hsu <vinceh@...dia.com>,
	Emil Velikov <emil.l.velikov@...il.com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ben Skeggs <bskeggs@...hat.com>,
	Martin Peres <martin.peres@...e.fr>,
	Roy Spliet <seven@...rod-online.com>,
	samuel.pitoiset@...il.com,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Nouveau] [PATCH nouveau 09/11] drm: export some variable and
 functions to resue the PM functions

On Mon, Jan 5, 2015 at 4:32 PM, Thierry Reding <thierry.reding@...il.com> wrote:
> On Tue, Dec 30, 2014 at 11:18:34AM +0800, Vince Hsu wrote:
>> Hi Emil,
>>
>> On 12/30/2014 10:34 AM, Emil Velikov wrote:
>> >On 23/12/14 10:40, Vince Hsu wrote:
>> >>This patch adds some checks in the suspend/resume functions to distinguish
>> >>the dGPU and mobile GPU and exports some variables/functions so that the
>> >>nouveau platform device can reuse them.
>> >>
>> >Hi Vince,
>> >
>> >Afaiu one needs to export a symbol as it's used by another module or
>> >subsystem. With the follow up two patches you are not doing either one,
>> >so I'd assume that you can just omit the EXPORT_* changes.
>> The nouveau platform device driver is built as another module -
>> nouveau_platform.ko. :)
>
> I'd like to hear the opinion of the nouveau people and Alex, but I'd
> very much prefer if nouveau_platform.o was simply linked into the
> nouveau.ko module. I don't see any good reason to keep it separate.

Yep, I agree. The decision to host platform support in a separate
module looks misleaded if it results in additional exports that we
would otherwise avoid. IIUC I did this to be able to use the module
convenience macros to register the platform driver.

>
> Something like the attached patch (untested) ought to do it.

This patch alone won't be enough for the reason I mentioned above.
However, if Vince doesn't mind handling the platform driver
registration manually in nouveau_drm_init/nouveau_drm_exit, I agree
this would be the way to go.

Cheers,
Alex.
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