[PATCH 0/2] Allow configfs to disable specific GT type(s)

[Matt Roper <matthew.d.roper@intel.com>]

During various debug or hardware bringup activities, it is often useful
to completely disable one of the GTs to reduce the scope of the debug.
Add a configfs attribute to make this easy to do in a standard manner,
similar to the existing attribute we have to limit engines.

Note that in practice it only makes sense to disable the media GT at the
moment.  In the future, with a bit of additional driver refactoring, it
should theoretically be possible to also disable the primary GT on igpu
platforms, resulting in a media-only or a no-GT (display-only) config.
But for now, the driver will refuse to probe the device if primary GT
disabling is attempted.  Also note that the requirement to keep the
primary GT enabled will likely always be present for dgpu platforms
since the driver relies on the BCS engines (part of the primary GT) for
various vram clear+copy operations.


Matt Roper (2):
  drm/xe/huc: Adjust HuC check on primary GT
  drm/xe/configfs: Add attribute to disable GT types

 drivers/gpu/drm/xe/xe_configfs.c | 119 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/xe/xe_configfs.h |   2 +
 drivers/gpu/drm/xe/xe_huc.c      |  10 ++-
 drivers/gpu/drm/xe/xe_pci.c      |  18 +++++
 4 files changed, 146 insertions(+), 3 deletions(-)

-- 
2.51.0