[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

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https://bugs.freedesktop.org/show_bug.cgi?id=109679

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|intel-gfx-bugs@lists.freede |
                   |sktop.org                   |
           Assignee|intel-gfx-bugs@lists.freede |dri-devel@lists.freedesktop
                   |sktop.org                   |.org
          Component|DRM/Intel                   |IGT

--- Comment #1 from Martin Peres <martin.peres@free.fr> ---
Actually, moving this to IGT as this is unlikely a problem of i915.

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[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

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https://bugs.freedesktop.org/show_bug.cgi?id=109679

--- Comment #2 from CI Bug Log <cibuglog@gmail.com> ---
The CI Bug Log issue associated to this bug has been updated.

### New filters associated

* CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call
failed: RPC failed at server.  &lt;type
&#39;exceptions.ZeroDivisionError&#39;&gt;:integer division or 
  -
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5629/fi-kbl-7500u/igt@kms_chamelium@hdmi-crc-fast.html

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[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

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https://bugs.freedesktop.org/show_bug.cgi?id=109679

--- Comment #3 from Stuart Summers <stuart.summers@intel.com> ---
Agree this looks like an issue in IGT or possibly in the chameleond daemon. At
a quick glance, there aren't a whole lot of places in the CaptureVideo path
that might trigger this exception in chameleond. It does look feasible that if
we were to pass a 0 for width and height, we could potentially get a
div-by-zero exception when chameleond prepares the video output:
CaptureVideo ->
_PrepareCapturingVideo/_captured_params['max_frame_limit']/flow_manager.GetMaxFrameLimit
-> input_flow.GetMaxFrameLimit -> frame_manager.GetMaxFrameLimit ->
field_manager.GetMaxFieldLimit -> VideoDumper.GetMaxFieldLimit:
  def GetMaxFieldLimit(cls, width, height):                          
    """Returns of the maximal number of fields which can be dumped.""" 
    BYTE_PER_PIXEL = 3                                                 
    PAGE_SIZE = 4096                                                         
    field_size = width * height * BYTE_PER_PIXEL   
    field_size = ((field_size - 1) / PAGE_SIZE + 1) * PAGE_SIZE
    return cls._DUMP_BUFFER_SIZE / field_size

That said, running this myself locally does not result in the failure of this
sighting, and from kms_chamelium.c, during the CRC check, we are passing 0 for
width and height:
  chamelium_capture(data->chamelium, port, 0, 0, 0, 0, count);

So I'd expect this to fail all the time if the issue were in the Python call I
indicated above.

And I'd also expect for CI to have seen this already if that were the case,
given this code has been present for some time.

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[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

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https://bugs.freedesktop.org/show_bug.cgi?id=109679

--- Comment #4 from Stuart Summers <stuart.summers@intel.com> ---
Sent that previous comment a little too quickly... It looks like we aren't
actually sending those 0's in the first place, in addition to my off-by-one
(given we are taking 0 - 1, not 0) miss:
  (w && h) ? "(iiiiii)" : "(iinnnn)",

>From chameleond, this will autofill x, y, width, and height based on the
current resolution. Maybe the resolution was misconfigured? Or perhaps there's
an issue in the chamelium FPGA?

I still think it would be interesting here to get the chameleond log (see
request here: https://gitlab.freedesktop.org/gfx-ci/i915-infra/issues/29 + the
recent patch I posted to igt). There is quite a bit of state logging in
chameleond with that patch run locally with --d.

The only other thing I see interesting in the logs is this, just before the
error:
(kms_chamelium:2877) igt_chamelium-DEBUG: Chamelium needs FSM, handling

I don't see that when I run locally. Maybe we're getting a spurious hotplug
event while trying to capture video? Or maybe the video capture is taking to
long and/or hung for some reason, causing the hotplug to timeout?

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[Bug 109679] [CI][BAT] CHAMELIUM: igt@kms_chamelium@hdmi-crc-fast - fail - Chamelium RPC call failed: RPC failed at server. <type 'exceptions.ZeroDivisionError'>:integer division or

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https://bugs.freedesktop.org/show_bug.cgi?id=109679

Easwar Hariharan <easwar.hariharan@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel@lists.freedesktop |stuart.summers@intel.com
                   |.org                        |

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