[Bug 109629] New: GPU hang on Haswell while encoding and decoding video

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109629

            Bug ID: 109629
           Summary: GPU hang on Haswell while encoding and decoding video
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: m.olbrich at pengutronix.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 143378
  --> https://bugs.freedesktop.org/attachment.cgi?id=143378&action=edit
/sys/class/drm/card0/error for drm-intel-fixes-2019-02-13

I'm getting GPU hangs while encoding & decoding H.264 video with vaapi. I'm not
quite sure what triggers the issue. It might be just starting or stopping,
resolution changes or corruptions in H.264 stream while decoding.

I've reproduced this with the following Kernel versions:
- 4.20.x
- 5.0-rc6
- drm-intel-next-2019-02-07
- drm-intel-fixes-2019-02-13

It does not occur with 4.19.x and older.
Git bisect gives me 79556df293b2efbb3ccebb6db02120d62e348b44 first bad commit.
On Haswell this changes the default for ppgtt from 1 (aliasing) to 2 (full). If
I set enable_ppgtt=1 on 4.20.x then the problem is gone.

I've attached the content of /sys/class/drm/card0/error for
drm-intel-fixes-2019-02-13.

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