linux-kernel - [PATCH v7 0/3] drm: Use full allocated minor range for DRM

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Message-ID: <20240823163048.2676257-1-michal.winiarski@intel.com>
Date: Fri, 23 Aug 2024 18:30:45 +0200
From: Michał Winiarski <michal.winiarski@...el.com>
To: <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	<intel-gfx@...ts.freedesktop.org>, <intel-xe@...ts.freedesktop.org>
CC: David Airlie <airlied@...il.com>, 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>,
	"Alex Deucher" <alexdeucher@...il.com>, Michał Winiarski
	<michal.winiarski@...el.com>
Subject: [PATCH v7 0/3] 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).

Additionally, convert minors to use XArray instead of IDR to simplify
the locking.

Corresponding libdrm changes were merged in:
https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/305

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

v6 -> v7:
Drop the force_extended_minors patch intended for debug
Rebase on latest drm-tip
Update the cover letter, pointing out libdrm changes

Michał Winiarski (3):
  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

 drivers/accel/drm_accel.c      | 110 +++------------------------------
 drivers/gpu/drm/drm_drv.c      |  97 ++++++++++++++---------------
 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, 62 insertions(+), 174 deletions(-)

-- 
2.46.0