[PATCH v4 0/3] VT: Add ability to get font requirements

From: Alexey Gladkov
Date: Tue Apr 02 2024 - 13:51:37 EST


We now have KD_FONT_OP_SET_TALL, but in fact such large fonts cannot be
loaded. No console driver supports tall fonts. Unfortunately, userspace
cannot distinguish the lack of support in the driver from errors in the
font itself. In all cases, EINVAL will be returned.

This patchset adds a separate ioctl to obtain the font parameters
supported by the console driver.

v4:
* Rebased on v6.9-rc1 and conflicts have been fixed.
* Do not copy KDFONTINFO data from the userspace.
* Header include/uapi/linux/kd.h uses _IOC macros to define ioctls.

v3:
* Added the use of the in_range macro.
* Squashed the commits that add ioctl to console divers.

v2:
* Instead of the KDFONTOP extension, a new ioctl has been added to
obtain font information.

Alexey Gladkov (3):
VT: Use macros to define ioctls
VT: Add KDFONTINFO ioctl
VT: Allow to get max font width and height

drivers/tty/vt/vt.c | 24 ++++++
drivers/tty/vt/vt_ioctl.c | 11 +++
drivers/video/console/newport_con.c | 21 +++++-
drivers/video/console/sticon.c | 25 ++++++-
drivers/video/console/vgacon.c | 21 +++++-
drivers/video/fbdev/core/fbcon.c | 16 ++++
include/linux/console.h | 3 +
include/linux/vt_kern.h | 1 +
include/uapi/linux/kd.h | 109 ++++++++++++++++------------
9 files changed, 176 insertions(+), 55 deletions(-)

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2.44.0