[PATCH v3 0/8] Add fdinfo support to Panfrost

[Adrián Larumbe]

This patch series adds fdinfo support to the Panfrost DRM driver. It will
display a series of key:value pairs under /proc/pid/fdinfo/fd for render
processes that open the Panfrost DRM file.

The pairs contain basic drm gpu engine and memory region information that
can either be cat by a privileged user or accessed with IGT's gputop
utility.

Changelog:

v1: https://lore.kernel.org/lkml/bb52b872-e41b-3894-285e-b52cfc849782@xxxxxxx/T/

v2: https://lore.kernel.org/lkml/20230901084457.5bc1ad69@xxxxxxxxxxxxx/T/
 - Changed the way gpu cycles and engine time are calculated, using GPU
 registers and taking into account potential resets.
 - Split render engine values into fragment and vertex/tiler ones.
 - Added more fine-grained calculation of RSS size for BO's.
 - Implemente selection of drm-memory region size units
 - Removed locking of shrinker's mutex in GEM obj status function

v3:
 - Changed fdinfo engine names to something more descriptive
 - Mentioned GPU cycle counts aren't an exact measure
 - Handled the case when job->priv might be NULL
 - Handled 32 bit overflow of cycle register
 - Kept fdinfo drm memory stats size unit display within 10k times the
   previous multiplier for more accurate BO size numbers
 - Removed special handling of Prime imported BO RSS
 - Use rss_size only for heap objects
 - Use bo->base.madv instead of specific purgeable flag
 - Fixed kernel test robot warnings

Adrián Larumbe (8):
  drm/panfrost: Add cycle count GPU register definitions
  drm/panfrost: Enable cycle counter register upon job submission
  drm/panfrost: Enable debugfs toggling of cycle counter register
  drm/panfrost: Add fdinfo support GPU load metrics
  drm/panfrost: Add fdinfo support for memory stats
  drm/drm_file: Add DRM obj's RSS reporting function for fdinfo
  drm/panfrost: Implement generic DRM object RSS reporting function
  drm/drm-file: Show finer-grained BO sizes in drm_show_memory_stats

 drivers/gpu/drm/drm_file.c                  |  7 ++-
 drivers/gpu/drm/panfrost/Makefile           |  2 +
 drivers/gpu/drm/panfrost/panfrost_debugfs.c | 51 ++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_debugfs.h | 13 +++++
 drivers/gpu/drm/panfrost/panfrost_devfreq.c |  8 +++
 drivers/gpu/drm/panfrost/panfrost_devfreq.h |  3 +
 drivers/gpu/drm/panfrost/panfrost_device.c  |  5 ++
 drivers/gpu/drm/panfrost/panfrost_device.h  | 19 ++++++
 drivers/gpu/drm/panfrost/panfrost_drv.c     | 65 ++++++++++++++++++++-
 drivers/gpu/drm/panfrost/panfrost_gem.c     | 28 +++++++++
 drivers/gpu/drm/panfrost/panfrost_gem.h     |  5 ++
 drivers/gpu/drm/panfrost/panfrost_gpu.c     | 43 ++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_gpu.h     |  6 ++
 drivers/gpu/drm/panfrost/panfrost_job.c     | 37 ++++++++++++
 drivers/gpu/drm/panfrost/panfrost_job.h     |  5 ++
 drivers/gpu/drm/panfrost/panfrost_mmu.c     | 12 ++--
 drivers/gpu/drm/panfrost/panfrost_regs.h    |  5 ++
 include/drm/drm_gem.h                       |  9 +++
 18 files changed, 316 insertions(+), 7 deletions(-)
 create mode 100644 drivers/gpu/drm/panfrost/panfrost_debugfs.c
 create mode 100644 drivers/gpu/drm/panfrost/panfrost_debugfs.h


base-commit: f45acf7acf75921c0409d452f0165f51a19a74fd
-- 
2.42.0