[PATCH v9 0/4] Panthor BO tagging and GEMS debug display

["Adrián Larumbe" <adrian.larumbe@collabora.com>]

This patch series is aimed at providing UM with detailed memory profiling
information in debug builds. It is achieved through a device-wide list of
DRM GEM objects, and also implementing the ability to label BO's from UM
through a new IOCTL.

The new debugfs file shows a list of driver DRM GEM objects in tabular mode.
To visualise it, cat sudo cat /sys/kernel/debug/dri/*.gpu/gems.
To test this functionality from UM, please refer to this Mesa patch series:
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34224

Discussion of previous revision of this patch series can be found at:
https://lore.kernel.org/dri-devel/20250415191539.55258-5-adrian.larumbe@collabora.com/

Changelog:
v9:
 - Added padding field to uAPI BO label ioctl struct
 - Simplified copying and bounds checking of label in ioctl function

v8:
 - Renamed NULL to NUL in comments describing NUL-terminated strings
 - Removed 'size' parameter from labelling ioctl() as max length can be
   handled by the kernel itself
 - Made sure to use kfree_const() everywhere labels are freed
 - Replaced maximum label size with numerical constant rather than page size
 - Added some warnings and checks in kernel BO labelling function

v7:
 - Improved formating of DebugFS GEM's status and usage flags
 - Deleted some spurious white spaces
 - Renamed usage flags setting function

v6:
 - Replaced some mutex calls with scoped guards
 - Documented data size limits in the label ioctl
 - Simplified GEMS status flags treatment (Panthor doesn't use madvise)
 - Fixed some array size and string bugs
 - Improved the naming of GEM status and usage flags to reflect their meaning
 - Improved the formatting of the output table

v5:
 - Kept case and naming of kernel BO's consistent
 - Increased the driver minor after new ioctl
 - Now adds BO to debugfs GEMs list at GEM object creation time
 - No longer try to hide BO creator's name when it's a workqueue or modprobe
 - Reworked the procedure for printing GEM state and kernel BO flags
 - Turned kernel BO flags and GEM state flags into bit enums
 - Wait until BO state is marked as initialied for debugfs display

v4:
 - Labelled all kernel BO's, not just heap chunks.
 - Refactored DebugGFs GEMs list handling functions
 - Added debugfs GEMS node mask to tell different kinds of BO's

Adrián Larumbe (4):
  drm/panthor: Introduce BO labeling
  drm/panthor: Add driver IOCTL for setting BO labels
  drm/panthor: Label all kernel BO's
  drm/panthor: show device-wide list of DRM GEM objects over DebugFS

 drivers/gpu/drm/panthor/panthor_device.c |   5 +
 drivers/gpu/drm/panthor/panthor_device.h |  11 ++
 drivers/gpu/drm/panthor/panthor_drv.c    |  90 ++++++++-
 drivers/gpu/drm/panthor/panthor_fw.c     |   8 +-
 drivers/gpu/drm/panthor/panthor_gem.c    | 233 ++++++++++++++++++++++-
 drivers/gpu/drm/panthor/panthor_gem.h    |  80 +++++++-
 drivers/gpu/drm/panthor/panthor_heap.c   |   6 +-
 drivers/gpu/drm/panthor/panthor_sched.c  |   9 +-
 include/uapi/drm/panthor_drm.h           |  20 ++
 9 files changed, 451 insertions(+), 11 deletions(-)

--
2.48.1