[PATCH v10 0/7] User readable error codes on atomic_ioctl failure

Arun R Murthy
2026-02-23T09:17:34Z

EDITME: Imported from f20260210-atomic-v9-5-525c88fd2402@intel.com
Please review before sending.

The series focuses on providing a user readable error value on a failure
in drm_atomic_ioctl(). Usually -EINVAL is returned in most of the error
cases and it is difficult for the user to decode the error and get to
know the real cause for the error. If user gets to know the reason for
the error then corrective measurements can be taken up.

User will have to check for the capability
DRM_CAP_ATOMIC_ERROR_REPORTING before using this feature so as to ensure
that the driver supports failure reporting.

TODO: driver specific error codes are to be added and will be done in
the follow-up patches.

TODO: Once the series is merged the element 'reserved' used for sending
the failure code in struct drm_mode_atomic is to changed to err_code.

The IGT related changes are pushed for review @
https://patchwork.freedesktop.org/series/153330/

[RFC] changes for libdrm pushed for review @
https://gitlab.freedesktop.org/mesa/libdrm/-/merge_requests/450

To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: suraj.kandpal@intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
To: Jani Nikula <jani.nikula@linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Tvrtko Ursulin <tursulin@ursulin.net>
To: xaver.hugl@kde.org
To: harry.wentland@amd.com
To: uma.shankar@intel.com
To: louis.chauvet@bootlin.com
To: naveen1.kumar@intel.com
To: ramya.krishna.yella@intel.com
Cc: dri-devel@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
Cc: intel-xe@lists.freedesktop.org
Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
Changes in v9:
- EDITME: describe what is new in this series revision.
- EDITME: use bulletpoints and terse descriptions.
- Link to v8: https://lore.kernel.org/r/20260129-atomic-v8-0-4cb7b0faa051@intel.com

---
Arun R Murthy (7):
drm: Define user readable error codes for atomic ioctl
drm/atomic: Add error_code element in atomic_state
drm/atomic: Call complete_signaling only if prepare_signaling is done
drm/atomic: Allocate atomic_state at the beginning of atomic_ioctl
drm/atomic: Return user readable error in atomic_ioctl
drm/i915/display: Error codes for async flip failures
drm: Introduce DRM_CAP_ATOMIC_ERROR_REPORTING

drivers/gpu/drm/drm_atomic.c | 31 ++++++++++
drivers/gpu/drm/drm_atomic_uapi.c | 89 ++++++++++++++++++++--------
drivers/gpu/drm/drm_ioctl.c | 3 +
drivers/gpu/drm/i915/display/intel_display.c | 25 ++++----
include/drm/drm_atomic.h | 10 ++++
include/uapi/drm/drm.h | 7 +++
include/uapi/drm/drm_mode.h | 37 ++++++++++++
7 files changed, 165 insertions(+), 37 deletions(-)
---
base-commit: cec43d5c2696af219fc2ef71dd7e93db48c80f66
change-id: 20250728-atomic-c9713fd357e4

Best regards,
--
Arun R Murthy <arun.r.murthy@intel.com>