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

[Alex Deucher]

Are there any objections to this series?  We have been running into
this limit as a problem for a while now on big servers.

Alex

On Mon, Jul 24, 2023 at 5:15 PM Michał Winiarski
<michal.winiarski at intel.com> wrote:
>
> 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
>