[v4,0/3] drm: Use full allocated minor range for DRM

Message

Michał Winiarski Sept. 6, 2022, 8:16 p.m. UTC

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 (skip_legacy_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)

Michał Winiarski (3):
  drm: Use XArray instead of IDR for minors
  drm: Expand max DRM device number to full MINORBITS
  drm: Introduce skip_legacy_minors modparam

 drivers/gpu/drm/drm_drv.c | 66 +++++++++++++++++++--------------------
 1 file changed, 33 insertions(+), 33 deletions(-)