[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

            Bug ID: 95545
           Summary: [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: csaba.halasz@gmail.com

Created attachment 123994
  --> https://bugs.freedesktop.org/attachment.cgi?id=123994&action=edit
vm fault report

Running mplayer with -vo gl:yuv=x  with x>1 causes GPU VM fault.
yuv=0 is software rendering, that works fine.
yuv=1 uses GL_NV_register_combiners and that doesn't fault but the output is
unusable.

The other values use fragment shaders, those are all broken.

Reportedly the apitrace works with older versions, mesa 11.2.2 and llvm 3.6.2.

kernel agd5f/drm-next-4.7 git 3b59c344ab6e2d00b0f4ad946024572618c87502
mesa git 65c2abf6fdd51b0a80a72caa0c52cf3f4578e743
llvm git ef1f2996c17c9b1480201239002b58851810e8fc
xf86-video-amdgpu git 60ced5026ebc34d9f32c7618430b6a7ef7c8eb4b
Xorg 1.18.0
mplayer svn r37870
gigabyte 380 (tonga)

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

--- Comment #1 from csaba.halasz@gmail.com ---
Created attachment 123995
  --> https://bugs.freedesktop.org/attachment.cgi?id=123995&action=edit
dmesg output

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

--- Comment #2 from csaba.halasz@gmail.com ---
Created attachment 123996
  --> https://bugs.freedesktop.org/attachment.cgi?id=123996&action=edit
stderr

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

--- Comment #3 from csaba.halasz@gmail.com ---
Created attachment 123997
  --> https://bugs.freedesktop.org/attachment.cgi?id=123997&action=edit
apitrace

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

Andy Furniss <adf.lists@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adf.lists@gmail.com

--- Comment #4 from Andy Furniss <adf.lists@gmail.com> ---
Doesn't affect other players using gl.

But anyway, testing with mplayer -vo gl <file> bisect came up with -

commit 70934de00eb42ba6fc43d104875962dfb260a1b3
Author: Marek Olšák <marek.olsak@amd.com>
Date:   Thu Apr 21 21:41:59 2016 +0200

    radeonsi: add new SDMA texture copy code

    This implements:
    - Linear-to-linear partial copies. (unaligned)
    - Tiled-to-linear and linear-to-tiled partial copies.
      (unaligned except 1-2 Bpp)
    - Tiled-to-tiled partial copies aligned to 8x8.

    v2: Extend the SDMA L2T VM fault workaround to T2L.
        - Same algorithm, just applied to T2L.
          (and using a 0-based address and surface.bo_size instead of
buf->size)

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|DRI git                     |git
         QA Contact|                            |dri-devel@lists.freedesktop
                   |                            |.org
            Product|DRI                         |Mesa
          Component|DRM/AMDgpu                  |Drivers/Gallium/radeonsi

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

--- Comment #5 from Marek Olšák <maraeo@gmail.com> ---
The problem is with the CE preamble which is sometimes skipped when it
shouldn't be. SDMA IB submission somehow affects it. The workarounds are:
- disable SDMA (bad)
- disable CE preamble (not so bad)
- execute SDMA in a different amdgpu context (not tested, just an idea I'll try
next)

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

--- Comment #6 from Marek Olšák <maraeo@gmail.com> ---
Using a difference context for SDMA doesn't help. Disabling the CE preamble
seems to be the only solution.

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[Bug 95545] [amdgpu][tonga] mplayer -vo=gl:yuv=2 causes VM fault

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https://bugs.freedesktop.org/show_bug.cgi?id=95545

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #7 from Marek Olšák <maraeo@gmail.com> ---
This seems to be fixed. Possible fix:

commit 54f755fa0fda14c578022767bcef2f27b2e89707
Author: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date:   Mon Jun 6 22:36:35 2016 +0200

    radeonsi: Reinitialize all descriptors in CE preamble.

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