[Intel-gfx] [PATCH] drm/i915/audio: error log non-zero audio power refcount after unbind

[Intel-gfx] [PATCH] drm/i915/audio: error log non-zero audio power refcount after unbind

[Jani Nikula]

We have some module unload/reload tests hitting an issue with i915
unbinding the component interface before the audio driver has properly
put the power. Log an error about it for ease of debugging. (Normally
this leads to a wakeref debug splat on the power well.)

Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/display/intel_audio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
index 57b80971ae78..793db13fcf25 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -1138,6 +1138,10 @@ static void i915_audio_component_unbind(struct device *i915_kdev,
 	drm_modeset_unlock_all(&dev_priv->drm);
 
 	device_link_remove(hda_kdev, i915_kdev);
+
+	if (dev_priv->audio_power_refcount)
+		drm_err(&dev_priv->drm, "audio power refcount %d after unbind\n",
+			dev_priv->audio_power_refcount);
 }
 
 static const struct component_ops i915_audio_component_bind_ops = {
-- 
2.20.1

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Re: [Intel-gfx] [PATCH] drm/i915/audio: error log non-zero audio power refcount after unbind

[Kai Vehmanen]

Hi Jani,

On Fri, 17 Apr 2020, Jani Nikula wrote:

> We have some module unload/reload tests hitting an issue with i915
> unbinding the component interface before the audio driver has properly
> put the power. Log an error about it for ease of debugging. (Normally

thanks, this is a good addition:
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Maybe one point to consider is whether to take the next step and just 
block the unload. On audio side, once acomp binding is done to i915 
driver, it is only released at hda driver unload. So any test case where 
audio driver is bound to i915, and test unloads i915 without unloading 
the audio driver first, will not work. Even if no immediate failure is 
seen at unload, functionality will be impacted after i915 is loaded 
again.

Not sure how to do this though. Normally module refcounts would take care
of this (and block i915 unload), but now that we have the component 
framework in between, something else is needed.

PS Audio driver also doesn't implement component unbind(), but I don't
   immediately see what it could do there. It can't return an error
   and the audio framework is not really prepared for invidual codec
   drivers to disappear at runtime. We can handle hotplug of complete 
   cards (like USB), but individual codec drivers are expected to stay loaded.
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Re: [Intel-gfx] [PATCH] drm/i915/audio: error log non-zero audio power refcount after unbind

[Jani Nikula]

On Fri, 17 Apr 2020, Kai Vehmanen <kai.vehmanen@linux.intel.com> wrote:
> Hi Jani,
>
> On Fri, 17 Apr 2020, Jani Nikula wrote:
>
>> We have some module unload/reload tests hitting an issue with i915
>> unbinding the component interface before the audio driver has properly
>> put the power. Log an error about it for ease of debugging. (Normally
>
> thanks, this is a good addition:
> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>

Thanks for the review, pushed to drm-intel-next-queued.

> Maybe one point to consider is whether to take the next step and just 
> block the unload. On audio side, once acomp binding is done to i915 
> driver, it is only released at hda driver unload. So any test case where 
> audio driver is bound to i915, and test unloads i915 without unloading 
> the audio driver first, will not work. Even if no immediate failure is 
> seen at unload, functionality will be impacted after i915 is loaded 
> again.
>
> Not sure how to do this though. Normally module refcounts would take care
> of this (and block i915 unload), but now that we have the component 
> framework in between, something else is needed.

Heh, had I known what to do, I'd have posted that. So I just opted for
logging to make the failure mode obvious.

I admit I didn't check what having an unbalanced get will actually
do. If we go ahead and power down the power well, I assume it'll cripple
the audio driver. I think our refcounting and power well handling should
read the hardware state and set up everything properly on load, but the
audio driver will have lost its marbles in the mean time. Even if by
some chance it doesn't lose its power during i915 unload/load cycle, it
won't have the component interface and can't ensure i915 doesn't go
ahead and cut power later.

BR,
Jani.


>
> PS Audio driver also doesn't implement component unbind(), but I don't
>    immediately see what it could do there. It can't return an error
>    and the audio framework is not really prepared for invidual codec
>    drivers to disappear at runtime. We can handle hotplug of complete 
>    cards (like USB), but individual codec drivers are expected to stay loaded.

-- 
Jani Nikula, Intel Open Source Graphics Center
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[Intel-gfx] ✗ Fi.CI.DOCS: warning for drm/i915/audio: error log non-zero audio power refcount after unbind

[Patchwork]

== Series Details ==

Series: drm/i915/audio: error log non-zero audio power refcount after unbind
URL   : https://patchwork.freedesktop.org/series/76061/
State : warning

== Summary ==

$ make htmldocs 2>&1 > /dev/null | grep i915
/home/cidrm/kernel/Documentation/gpu/i915.rst:610: WARNING: duplicate label gpu/i915:layout, other instance in /home/cidrm/kernel/Documentation/gpu/i915.rst

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[Intel-gfx] ✓ Fi.CI.BAT: success for drm/i915/audio: error log non-zero audio power refcount after unbind

[Patchwork]

== Series Details ==

Series: drm/i915/audio: error log non-zero audio power refcount after unbind
URL   : https://patchwork.freedesktop.org/series/76061/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_8314 -> Patchwork_17339
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/index.html

Known issues
------------

  Here are the changes found in Patchwork_17339 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@i915_selftest@live@execlists:
    - fi-icl-dsi:         [PASS][1] -> [INCOMPLETE][2] ([i915#1713])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/fi-icl-dsi/igt@i915_selftest@live@execlists.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/fi-icl-dsi/igt@i915_selftest@live@execlists.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [i915#1713]: https://gitlab.freedesktop.org/drm/intel/issues/1713
  [i915#1725]: https://gitlab.freedesktop.org/drm/intel/issues/1725


Participating hosts (51 -> 46)
------------------------------

  Additional (1): fi-kbl-soraka 
  Missing    (6): fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-ctg-p8600 fi-byt-clapper fi-bdw-samus 


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_8314 -> Patchwork_17339

  CI-20190529: 20190529
  CI_DRM_8314: e8a432aa7e81e2bf5b6d4b23e3598f9fea947b83 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5598: 276b8a3f24837e009ff38512f7eeb07029e52616 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17339: 32f920f53cb511940869075a600fd2de3d4b0a73 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

32f920f53cb5 drm/i915/audio: error log non-zero audio power refcount after unbind

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/index.html
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[Intel-gfx] ✓ Fi.CI.IGT: success for drm/i915/audio: error log non-zero audio power refcount after unbind

[Patchwork]

== Series Details ==

Series: drm/i915/audio: error log non-zero audio power refcount after unbind
URL   : https://patchwork.freedesktop.org/series/76061/
State : success

== Summary ==

CI Bug Log - changes from CI_DRM_8314_full -> Patchwork_17339_full
====================================================

Summary
-------

  **SUCCESS**

  No regressions found.

  

Known issues
------------

  Here are the changes found in Patchwork_17339_full that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@i915_selftest@live@requests:
    - shard-tglb:         [PASS][1] -> [INCOMPLETE][2] ([i915#1531] / [i915#1658])
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-tglb5/igt@i915_selftest@live@requests.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-tglb1/igt@i915_selftest@live@requests.html

  * igt@i915_suspend@forcewake:
    - shard-apl:          [PASS][3] -> [DMESG-WARN][4] ([i915#180] / [i915#95])
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-apl7/igt@i915_suspend@forcewake.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-apl4/igt@i915_suspend@forcewake.html

  * igt@kms_cursor_crc@pipe-a-cursor-64x21-random:
    - shard-kbl:          [PASS][5] -> [FAIL][6] ([i915#54] / [i915#93] / [i915#95])
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-kbl7/igt@kms_cursor_crc@pipe-a-cursor-64x21-random.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-kbl3/igt@kms_cursor_crc@pipe-a-cursor-64x21-random.html

  * igt@kms_cursor_legacy@2x-long-flip-vs-cursor-atomic:
    - shard-glk:          [PASS][7] -> [FAIL][8] ([i915#72])
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-glk5/igt@kms_cursor_legacy@2x-long-flip-vs-cursor-atomic.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-glk6/igt@kms_cursor_legacy@2x-long-flip-vs-cursor-atomic.html

  * igt@kms_cursor_legacy@pipe-b-torture-bo:
    - shard-iclb:         [PASS][9] -> [DMESG-WARN][10] ([i915#128])
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-iclb1/igt@kms_cursor_legacy@pipe-b-torture-bo.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-iclb8/igt@kms_cursor_legacy@pipe-b-torture-bo.html

  * igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes:
    - shard-apl:          [PASS][11] -> [DMESG-WARN][12] ([i915#180])
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-apl3/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes.html
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-apl1/igt@kms_plane@plane-panning-bottom-right-suspend-pipe-a-planes.html

  * igt@kms_psr@no_drrs:
    - shard-iclb:         [PASS][13] -> [FAIL][14] ([i915#173])
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-iclb7/igt@kms_psr@no_drrs.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-iclb1/igt@kms_psr@no_drrs.html

  * igt@kms_psr@psr2_basic:
    - shard-iclb:         [PASS][15] -> [SKIP][16] ([fdo#109441]) +2 similar issues
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-iclb2/igt@kms_psr@psr2_basic.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-iclb5/igt@kms_psr@psr2_basic.html

  * igt@kms_vblank@pipe-a-ts-continuation-suspend:
    - shard-kbl:          [PASS][17] -> [DMESG-WARN][18] ([i915#180])
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-kbl1/igt@kms_vblank@pipe-a-ts-continuation-suspend.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-kbl7/igt@kms_vblank@pipe-a-ts-continuation-suspend.html

  
#### Possible fixes ####

  * igt@gem_exec_suspend@basic-s3:
    - shard-skl:          [INCOMPLETE][19] ([i915#69]) -> [PASS][20]
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl7/igt@gem_exec_suspend@basic-s3.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl3/igt@gem_exec_suspend@basic-s3.html

  * igt@gem_exec_whisper@basic-queues:
    - shard-iclb:         [FAIL][21] -> [PASS][22]
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-iclb7/igt@gem_exec_whisper@basic-queues.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-iclb1/igt@gem_exec_whisper@basic-queues.html

  * igt@kms_cursor_crc@pipe-a-cursor-suspend:
    - shard-kbl:          [DMESG-WARN][23] ([i915#180]) -> [PASS][24] +7 similar issues
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-kbl1/igt@kms_cursor_crc@pipe-a-cursor-suspend.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-kbl1/igt@kms_cursor_crc@pipe-a-cursor-suspend.html

  * igt@kms_cursor_crc@pipe-c-cursor-64x21-random:
    - shard-glk:          [FAIL][25] ([i915#54]) -> [PASS][26]
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-glk8/igt@kms_cursor_crc@pipe-c-cursor-64x21-random.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-glk7/igt@kms_cursor_crc@pipe-c-cursor-64x21-random.html

  * igt@kms_draw_crc@draw-method-rgb565-mmap-wc-untiled:
    - shard-glk:          [FAIL][27] ([i915#52] / [i915#54]) -> [PASS][28]
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-glk5/igt@kms_draw_crc@draw-method-rgb565-mmap-wc-untiled.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-glk5/igt@kms_draw_crc@draw-method-rgb565-mmap-wc-untiled.html

  * {igt@kms_flip@flip-vs-expired-vblank-interruptible@b-edp1}:
    - shard-skl:          [FAIL][29] ([i915#79]) -> [PASS][30] +1 similar issue
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl2/igt@kms_flip@flip-vs-expired-vblank-interruptible@b-edp1.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl2/igt@kms_flip@flip-vs-expired-vblank-interruptible@b-edp1.html

  * {igt@kms_flip@flip-vs-suspend@a-dp1}:
    - shard-apl:          [DMESG-WARN][31] ([i915#180]) -> [PASS][32] +2 similar issues
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-apl4/igt@kms_flip@flip-vs-suspend@a-dp1.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-apl3/igt@kms_flip@flip-vs-suspend@a-dp1.html

  * {igt@kms_flip@plain-flip-fb-recreate-interruptible@c-edp1}:
    - shard-skl:          [FAIL][33] ([i915#34]) -> [PASS][34] +1 similar issue
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl9/igt@kms_flip@plain-flip-fb-recreate-interruptible@c-edp1.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl9/igt@kms_flip@plain-flip-fb-recreate-interruptible@c-edp1.html

  * igt@kms_hdr@bpc-switch-dpms:
    - shard-skl:          [FAIL][35] ([i915#1188]) -> [PASS][36]
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl9/igt@kms_hdr@bpc-switch-dpms.html
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl3/igt@kms_hdr@bpc-switch-dpms.html

  * igt@kms_plane_alpha_blend@pipe-c-coverage-7efc:
    - shard-skl:          [FAIL][37] ([fdo#108145] / [i915#265]) -> [PASS][38] +1 similar issue
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl6/igt@kms_plane_alpha_blend@pipe-c-coverage-7efc.html
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl6/igt@kms_plane_alpha_blend@pipe-c-coverage-7efc.html

  * igt@kms_psr@psr2_primary_page_flip:
    - shard-iclb:         [SKIP][39] ([fdo#109441]) -> [PASS][40] +1 similar issue
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-iclb5/igt@kms_psr@psr2_primary_page_flip.html
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-iclb2/igt@kms_psr@psr2_primary_page_flip.html

  * igt@kms_universal_plane@universal-plane-pipe-c-functional:
    - shard-skl:          [FAIL][41] ([i915#331]) -> [PASS][42]
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-skl6/igt@kms_universal_plane@universal-plane-pipe-c-functional.html
   [42]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-skl6/igt@kms_universal_plane@universal-plane-pipe-c-functional.html

  * {igt@perf@blocking-parameterized}:
    - shard-tglb:         [FAIL][43] ([i915#1542]) -> [PASS][44]
   [43]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-tglb2/igt@perf@blocking-parameterized.html
   [44]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-tglb5/igt@perf@blocking-parameterized.html

  
#### Warnings ####

  * igt@i915_pm_dc@dc6-psr:
    - shard-tglb:         [SKIP][45] ([i915#468]) -> [FAIL][46] ([i915#454]) +1 similar issue
   [45]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8314/shard-tglb2/igt@i915_pm_dc@dc6-psr.html
   [46]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/shard-tglb8/igt@i915_pm_dc@dc6-psr.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#108145]: https://bugs.freedesktop.org/show_bug.cgi?id=108145
  [fdo#109441]: https://bugs.freedesktop.org/show_bug.cgi?id=109441
  [i915#1188]: https://gitlab.freedesktop.org/drm/intel/issues/1188
  [i915#128]: https://gitlab.freedesktop.org/drm/intel/issues/128
  [i915#1531]: https://gitlab.freedesktop.org/drm/intel/issues/1531
  [i915#1542]: https://gitlab.freedesktop.org/drm/intel/issues/1542
  [i915#1658]: https://gitlab.freedesktop.org/drm/intel/issues/1658
  [i915#173]: https://gitlab.freedesktop.org/drm/intel/issues/173
  [i915#180]: https://gitlab.freedesktop.org/drm/intel/issues/180
  [i915#198]: https://gitlab.freedesktop.org/drm/intel/issues/198
  [i915#265]: https://gitlab.freedesktop.org/drm/intel/issues/265
  [i915#331]: https://gitlab.freedesktop.org/drm/intel/issues/331
  [i915#34]: https://gitlab.freedesktop.org/drm/intel/issues/34
  [i915#454]: https://gitlab.freedesktop.org/drm/intel/issues/454
  [i915#468]: https://gitlab.freedesktop.org/drm/intel/issues/468
  [i915#52]: https://gitlab.freedesktop.org/drm/intel/issues/52
  [i915#54]: https://gitlab.freedesktop.org/drm/intel/issues/54
  [i915#69]: https://gitlab.freedesktop.org/drm/intel/issues/69
  [i915#72]: https://gitlab.freedesktop.org/drm/intel/issues/72
  [i915#79]: https://gitlab.freedesktop.org/drm/intel/issues/79
  [i915#93]: https://gitlab.freedesktop.org/drm/intel/issues/93
  [i915#95]: https://gitlab.freedesktop.org/drm/intel/issues/95


Participating hosts (10 -> 10)
------------------------------

  No changes in participating hosts


Build changes
-------------

  * CI: CI-20190529 -> None
  * Linux: CI_DRM_8314 -> Patchwork_17339

  CI-20190529: 20190529
  CI_DRM_8314: e8a432aa7e81e2bf5b6d4b23e3598f9fea947b83 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_5598: 276b8a3f24837e009ff38512f7eeb07029e52616 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_17339: 32f920f53cb511940869075a600fd2de3d4b0a73 @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4509: fdc5a4ca11124ab8413c7988896eec4c97336694 @ git://anongit.freedesktop.org/piglit

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_17339/index.html
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