linux-kernel - Re: [PATCH v6 3/4] drm: Expand max DRM device number to full MINORBITS

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Date:   Tue, 8 Aug 2023 15:55:56 +0200
From:   Christian König <christian.koenig@....com>
To:     Simon Ser <contact@...rsion.fr>
Cc:     Michał Winiarski <michal.winiarski@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Matthew Wilcox <willy@...radead.org>,
        Oded Gabbay <ogabbay@...nel.org>,
        James Zhu <James.Zhu@....com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [PATCH v6 3/4] drm: Expand max DRM device number to full
 MINORBITS

Am 28.07.23 um 16:22 schrieb Simon Ser:
> On Thursday, July 27th, 2023 at 14:01, Christian König <christian.koenig@....com> wrote:
>
>>> We do need patches to stop trying to infer the node type from the minor
>>> in libdrm, though. Emil has suggested using sysfs, which we already do
>>> in a few places in libdrm.
>> That sounds like a really good idea to me as well.
>>
>> But what do we do with DRM_MAX_MINOR? Change it or keep it and say apps
>> should use drmGetDevices2() like Emil suggested?
> DRM_MAX_MINOR has been bumped to 64 now.
>
> With the new minor allocation scheme, DRM_MAX_MINOR is meaningless
> because there is no "max minor per type" concept anymore: the minor no
> longer contains the type.
>
> So I'd suggest leaving it as-is (so that old apps still continue to
> work on systems with < 64 devices like they do today) and mark it as
> deprecated.

Sounds like a plan to me.

Regards,
Christian.