[0/3] drm/xe: Fix races on fdinfo

Message

Lucas De Marchi Oct. 26, 2024, 6:26 a.m. UTC

The current reading of engine utilization has same races. This should
fix most of them while also drastically reducing the update rate needed
on "normal apps".

I left tests/xe_drm_fdinfo running on 2 systems and saw no failures
after 100 iterations.

Lucas De Marchi (3):
  drm/xe: Add trace to lrc timestamp update
  drm/xe: Accumulate exec queue timestamp on destroy
  drm/xe: Stop accumulating LRC timestamp on job_free

 drivers/gpu/drm/xe/Makefile        |  1 +
 drivers/gpu/drm/xe/xe_exec_queue.c | 14 ++++++++
 drivers/gpu/drm/xe/xe_guc_submit.c |  2 --
 drivers/gpu/drm/xe/xe_lrc.c        |  3 ++
 drivers/gpu/drm/xe/xe_trace_lrc.c  |  9 ++++++
 drivers/gpu/drm/xe/xe_trace_lrc.h  | 52 ++++++++++++++++++++++++++++++
 6 files changed, 79 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/drm/xe/xe_trace_lrc.c
 create mode 100644 drivers/gpu/drm/xe/xe_trace_lrc.h