[RFC,0/5] Cursor Fault Fixes

Message

Chaitanya Kumar Borah Feb. 4, 2024, 7:52 p.m. UTC

This series is based on top of [1] floated by Maarten.
To fix, regressions seen in CI following changes were made on top of the
original series.

1. add a check in the plane state destroy hook to not move forward if the vblank worker is scheduled.
2. add checks before accessing frame buffer object (we are not sure yet how much this helps but we have found that this operation causes dump stacks)
3. do not defer the intel atomic cleanup into a work queue, instead execute it at the end of atomic commit tail.

While this series is in noway a complete or proper solution it is meant to trigger a discussion to arrive at one.

[1] https://patchwork.freedesktop.org/series/126934/

Chaitanya Kumar Borah (3):
  drm/i915: do not destroy plane state if cursor unpin worker is
    scheduled
  drm/i915: Add sanity checks before accessing fb buffer object
  drm/i915: do not defer cleanup work

Maarten Lankhorst (1):
  drm/i915: Use the same vblank worker for atomic unpin

Ville Syrjälä (1):
  drm/i915: Use vblank worker to unpin old legacy cursor fb safely

 .../gpu/drm/i915/display/intel_atomic_plane.c | 55 ++++++++++++++++++-
 .../gpu/drm/i915/display/intel_atomic_plane.h |  4 ++
 drivers/gpu/drm/i915/display/intel_crtc.c     | 27 +++++++++
 drivers/gpu/drm/i915/display/intel_cursor.c   | 26 ++++++++-
 drivers/gpu/drm/i915/display/intel_cursor.h   |  3 +
 drivers/gpu/drm/i915/display/intel_display.c  | 11 ++--
 .../drm/i915/display/intel_display_types.h    |  3 +
 7 files changed, 120 insertions(+), 9 deletions(-)