[PATCH i-g-t v4 0/2] lib/xe: Use synchronous gt resets when needed

[Jonathan Cavitt]

Add a new xe_force_gt_reset function, xe_force_gt_reset_sync, renaming
the original xe_force_gt_reset to xe_force_gt_reset_async.  This allows
the user to decide whether or not they want to initiate a synchronous or
asynchronous gt reset.  The asynchronous reset function was otherwise
unchanged, but the synchronous reset function operates by calling a new
debugfs function.

Tests will use the asynchronous gt reset function by default, but the
test xe_exec_reset at cm-gt-reset will want to use the synchronous version
because it lacks a blocking mechanism on the reset and may race with
itself otherwise.

v2:
- Create a new function for synchronous gt reset instead of using a tag
  to denote between the two modes (Matthew Brost)

v3:
- Fix compile issue

v4:
- Use helper function for xe_force_gt_reset_[sync|async] functions to
  reduce code duplication (Matthew Brost)
- Add missing revision notes

Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1068
Test-with: 20240605150828.2736396-1-jonathan.cavitt at intel.com
Suggested-by: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
CC: John Harrison <john.c.harrison at intel.com>
CC: Stuart Summers <stuart.summers at intel.com>

Jonathan Cavitt (2):
  lib/xe: Add sync and async xe_force_gt_reset options
  test/intel/xe_exec_reset: Synchronize cm-gt-reset gt resets

 lib/xe/xe_gt.c              |  2 +-
 lib/xe/xe_ioctl.c           | 16 +++++++++++++---
 lib/xe/xe_ioctl.h           |  3 ++-
 tests/intel/xe_exec_reset.c |  8 ++++----
 tests/intel/xe_gt_freq.c    |  2 +-
 tests/intel/xe_wedged.c     |  2 +-
 6 files changed, 22 insertions(+), 11 deletions(-)

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2.25.1