linux-kernel - [PATCH v6 0/4] drm: Use full allocated minor range for DRM

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Message-ID: <20230724211428.3831636-1-michal.winiarski@intel.com>
Date:   Mon, 24 Jul 2023 23:14:24 +0200
From:   Michał Winiarski <michal.winiarski@...el.com>
To:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <intel-gfx@...ts.freedesktop.org>
CC:     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>,
        Simon Ser <contact@...rsion.fr>,
        Matthew Wilcox <willy@...radead.org>,
        Oded Gabbay <ogabbay@...nel.org>,
        Christian König <christian.koenig@....com>,
        James Zhu <James.Zhu@....com>,
        Pekka Paalanen <pekka.paalanen@...labora.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Michał Winiarski <michal.winiarski@...el.com>
Subject: [PATCH v6 0/4] drm: Use full allocated minor range for DRM

64 DRM device nodes is not enough for everyone.
Upgrade it to ~512K (which definitely is more than enough).

To allow testing userspace support for >64 devices, add additional DRM
modparam (force_extended_minors) which causes DRM to skip allocating minors
in 0-192 range.
Additionally - convert minors to use XArray instead of IDR to simplify the
locking.

v1 -> v2:
Don't touch DRM_MINOR_CONTROL and its range (Simon Ser)

v2 -> v3:
Don't use legacy scheme for >=192 minor range (Dave Airlie)
Add modparam for testing (Dave Airlie)
Add lockdep annotation for IDR (Daniel Vetter)

v3 -> v4:
Convert from IDR to XArray (Matthew Wilcox)

v4 -> v5:
Fixup IDR to XArray conversion (Matthew Wilcox)

v5 -> v6:
Also convert Accel to XArray
Rename skip_legacy_minors to force_extended_minors

Michał Winiarski (4):
  drm: Use XArray instead of IDR for minors
  accel: Use XArray instead of IDR for minors
  drm: Expand max DRM device number to full MINORBITS
  drm: Introduce force_extended_minors modparam

 drivers/accel/drm_accel.c      | 110 +++------------------------------
 drivers/gpu/drm/drm_drv.c      | 105 ++++++++++++++++---------------
 drivers/gpu/drm/drm_file.c     |   2 +-
 drivers/gpu/drm/drm_internal.h |   4 --
 include/drm/drm_accel.h        |  18 +-----
 include/drm/drm_file.h         |   5 ++
 6 files changed, 69 insertions(+), 175 deletions(-)

-- 
2.41.0