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Message-ID: <b7811942-da09-7295-4774-46360715f147@intel.com>
Date:   Thu, 1 Jun 2023 19:14:50 +0200
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Subject: Re: [Intel-gfx] [PATCH v8 0/7] drm/i915: use ref_tracker library for
 tracking wakerefs
From:   Andrzej Hajda <andrzej.hajda@intel.com>
To:     "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Eric Dumazet <edumazet@google.com>
Cc:     netdev@vger.kernel.org, Rodrigo Vivi <rodrigo.vivi@kernel.org>,
        intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        Chris Wilson <chris@chris-wilson.co.uk>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        David Airlie <airlied@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>
References: <20230224-track_gt-v8-0-4b6517e61be6@intel.com>
 <55aa19b3-58d4-02ae-efd1-c3f3d0f21ce6@intel.com>
 <ZFVhx2PBdcwpNNl0@rdvivi-mobl4>
 <bb49bbd6-1ff2-8dba-11d1-6b6ab2ccd986@intel.com>
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On 08.05.2023 19:16, Andrzej Hajda wrote:
> On 05.05.2023 22:06, Rodrigo Vivi wrote:
>> On Thu, May 04, 2023 at 06:27:53PM +0200, Andrzej Hajda wrote:
>>> Hi maintainers of net and i915,
>>>
>>> On 25.04.2023 00:05, Andrzej Hajda wrote:
>>>> 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.


Ping on the series, everything reviewed.
Eric, Dave, Jakub, could you take patches 1-4 via net tree?

Regards
Andrzej

>>>>
>>>> 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
>>>
>>> Finally all patches are reviewed.
>>> Question to network and i915 maintainers, how to merge this patchset:
>>> 1. Patches 1-4 belongs rather to network domain (especially patch 2).
>>> 2. Patches 5-7 are for i915.
>>
>> Well, probably the easiest way to avoid conflicts would be to send
>> this right now through the net repo.
>>
>> And hold patches 5-7 after drm-intel-next can backmerge them.
>>
>> At this point I believe we would be looking at 6.5-rc2
>> backmerge to drm-intel-next in likely 11 weeks from now.
>>
>> Do we have any urgency on them? Looking to all the changes in
>> i915 I believe we will get many conflicts if we let all these
>> i915 patches go through net tree as well.
> 
> 
> Eric, Dave, Jakub, could you take patches 1-4?
> 
> Regards
> Andrzej
> 
> 
>>
>>>
>>> What would be the best way to do it?
>>>
>>> Regards
>>> Andrzej
>>>
>>>
>>>
>>>>
>>>>    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,
>>>
>