[PATCH v8 0/7] drm/i915: use ref_tracker library for tracking wakerefs

[Andrzej Hajda <andrzej.hajda@intel.com>]

This is revived patchset improving ref_tracker library and converting
i915 internal tracker to ref_tracker.
The old thread ended without consensus about small kernel allocations,
which are performed under spinlock.
I have tried to solve the problem by splitting the calls, but it results
in complicated API, so I went back to original solution.
If there are better solutions I am glad to discuss them.
Meanwhile I send original patchset with addressed remaining comments.

To: Jani Nikula <jani.nikula@linux.intel.com>
To: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
To: David Airlie <airlied@gmail.com>
To: Daniel Vetter <daniel@ffwll.ch>
To: Eric Dumazet <edumazet@google.com>
Cc: linux-kernel@vger.kernel.org
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: netdev@vger.kernel.org
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Das, Nirmoy <nirmoy.das@linux.intel.com>
Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>

---
Changes in v8:
- addressed comments from Eric, Zhou and CI, thanks,
- added ref_tracker_dir_init name argument to all callers in one patch
- moved intel_wakeref_tracker_show to *.c
- s/intel_wakeref_tracker_show/intel_ref_tracker_show/
- removed 'default n' from Kconfig
- changed strlcpy to strscpy,
- removed assignement from if condition,
- removed long lines from patch description
- added tags
- Link to v7: https://lore.kernel.org/r/20230224-track_gt-v7-0-11f08358c1ec@intel.com

Changes in v7:
- removed 8th patch (hold wakeref), as it was already merged
- added tags (thx Andi)
- Link to v6: https://lore.kernel.org/r/20230224-track_gt-v6-0-0dc8601fd02f@intel.com

Changes in v6:
- rebased to solve minor conflict and allow CI testing
- Link to v5: https://lore.kernel.org/r/20230224-track_gt-v5-0-77be86f2c872@intel.com

Changes in v5 (thx Andi for review):
- use *_locked convention instead of __*,
- improved commit messages,
- re-worked i915 patches, squashed separation and conversion patches,
- added tags,
- Link to v4: https://lore.kernel.org/r/20230224-track_gt-v4-0-464e8ab4c9ab@intel.com

Changes in v4:
- split "Separate wakeref tracking" to smaller parts
- fixed typos,
- Link to v1-v3: https://patchwork.freedesktop.org/series/100327/

---
Andrzej Hajda (7):
      lib/ref_tracker: add unlocked leak print helper
      lib/ref_tracker: improve printing stats
      lib/ref_tracker: add printing to memory buffer
      lib/ref_tracker: remove warnings in case of allocation failure
      drm/i915: Correct type of wakeref variable
      drm/i915: Replace custom intel runtime_pm tracker with ref_tracker library
      drm/i915: Track gt pm wakerefs

 drivers/gpu/drm/i915/Kconfig.debug                 |  18 ++
 drivers/gpu/drm/i915/display/intel_display_power.c |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c     |   7 +-
 .../drm/i915/gem/selftests/i915_gem_coherency.c    |  10 +-
 drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c |  14 +-
 drivers/gpu/drm/i915/gt/intel_breadcrumbs.c        |  13 +-
 drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h  |   3 +-
 drivers/gpu/drm/i915/gt/intel_context.h            |   4 +-
 drivers/gpu/drm/i915/gt/intel_context_types.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_engine_pm.c          |   7 +-
 drivers/gpu/drm/i915/gt/intel_engine_types.h       |   2 +
 .../gpu/drm/i915/gt/intel_execlists_submission.c   |   2 +-
 drivers/gpu/drm/i915/gt/intel_gt_pm.c              |  12 +-
 drivers/gpu/drm/i915/gt/intel_gt_pm.h              |  38 +++-
 drivers/gpu/drm/i915/gt/intel_gt_pm_debugfs.c      |   4 +-
 drivers/gpu/drm/i915/gt/selftest_engine_cs.c       |  20 +-
 drivers/gpu/drm/i915/gt/selftest_gt_pm.c           |   5 +-
 drivers/gpu/drm/i915/gt/selftest_reset.c           |  10 +-
 drivers/gpu/drm/i915/gt/selftest_rps.c             |  17 +-
 drivers/gpu/drm/i915/gt/selftest_slpc.c            |   5 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c  |  12 +-
 drivers/gpu/drm/i915/i915_driver.c                 |   2 +-
 drivers/gpu/drm/i915/i915_pmu.c                    |  16 +-
 drivers/gpu/drm/i915/intel_runtime_pm.c            | 221 ++-------------------
 drivers/gpu/drm/i915/intel_runtime_pm.h            |  11 +-
 drivers/gpu/drm/i915/intel_wakeref.c               |  35 +++-
 drivers/gpu/drm/i915/intel_wakeref.h               |  73 ++++++-
 include/linux/ref_tracker.h                        |  25 ++-
 lib/ref_tracker.c                                  | 179 ++++++++++++++---
 lib/test_ref_tracker.c                             |   2 +-
 net/core/dev.c                                     |   2 +-
 net/core/net_namespace.c                           |   4 +-
 32 files changed, 445 insertions(+), 332 deletions(-)
---
base-commit: 4d0066a1c0763d50b6fb017e27d12b081ce21b57
change-id: 20230224-track_gt-1b3da8bdacd7

Best regards,
-- 
Andrzej Hajda <andrzej.hajda@intel.com>