[Bug 44121] New: Reproducible GPU lockup CP stall on Radeon HD 6450

[Bug 44121] New: Reproducible GPU lockup CP stall on Radeon HD 6450

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https://bugzilla.kernel.org/show_bug.cgi?id=44121

           Summary: Reproducible GPU lockup CP stall on Radeon HD 6450
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.5-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: khali@linux-fr.org
                CC: alexdeucher@gmail.com
        Regression: Yes


With kernels 3.5-rc3 to 3.5-rc5, I hit a GPU lockup CP stall issue whenever I
do some actions in Firefox: if I need to authenticate to access a given site,
or when the download target selection window pops up. I'm running Gnome 3.2 on
openSUSE 12.1.

When this happens, the whole Gnome interface freezes, with gnome-shell stuck at
100% CPU. In the kernel logs I see the following:

radeon 0000:08:00.0: GPU lockup CP stall for more than 10000msec
radeon 0000:08:00.0: GPU lockup (waiting for 0x00000000000113f3 last fence id
0x00000000000113f0)
radeon 0000:08:00.0: GPU softreset 
radeon 0000:08:00.0:   GRBM_STATUS=0xE55008A0
radeon 0000:08:00.0:   GRBM_STATUS_SE0=0xEC000001
radeon 0000:08:00.0:   GRBM_STATUS_SE1=0x00000007
radeon 0000:08:00.0:   SRBM_STATUS=0x200000C0
radeon 0000:08:00.0:   GRBM_SOFT_RESET=0x00007F6B
radeon 0000:08:00.0:   GRBM_STATUS=0x00003828
radeon 0000:08:00.0:   GRBM_STATUS_SE0=0x00000007
radeon 0000:08:00.0:   GRBM_STATUS_SE1=0x00000007
radeon 0000:08:00.0:   SRBM_STATUS=0x200000C0
radeon 0000:08:00.0: GPU reset succeed
[drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
radeon 0000:08:00.0: WB enabled
radeon 0000:08:00.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and
cpu addr 0xffff88013557bc00
[drm] ring test on 0 succeeded in 0 usecs
[drm] ib test on ring 0 succeeded in 0 usecs

I have more samples if needed.

No problem when doing the same with kernel 3.4.4.

I ran "git bisect" and found that reverting the following commit fixes the
problem:

commit 416a2bd274566a6f607a271f524b2dc0b84d9106
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Thu May 31 19:00:25 2012 -0400

    drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)

    Tiling group size is always 256bits on r6xx/r7xx/r8xx/9xx. Also fix and
    simplify render backend map. This now properly sets up the backend map
    on r6xx-9xx which should improve 3D performance.

    Vadim benchmarked also:
    Some benchmarks on juniper (5750), fullscreen 1920x1080,
    first result - kernel 3.4.0+ (fb21affa), second - with these patches:

    Lightsmark:   91 fps => 123 fps    +35%
    Doom3:        74 fps => 101 fps    +36%

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Jerome Glisse <jglisse@redhat.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

Let me know if you need more debugging information, I'll do whatever I can to
help.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2012-07-03 14:53:04 ---
Can you dump the following registers using radeonreg or avivotool
(http://cgit.freedesktop.org/~airlied/radeontool/) with the patch applied and
reverted and attach both results?

CC_RB_BACKEND_DISABLE (0x98F4)
CC_SYS_RB_BACKEND_DISABLE (0x3F88)
GC_USER_RB_BACKEND_DISABLE (0x9B7C)
CC_GC_SHADER_PIPE_CONFIG (0x8950)
GB_BACKEND_MAP (0x98FC)

(as root):
radeonreg regmatch 0x98F4
etc.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #2 from Jean Delvare <khali@linux-fr.org>  2012-07-03 15:27:00 ---
With 3.5-rc5 kernel (failing) :

0x98F4    0x00000001 (1)
0x3F88    0x00000001 (1)
0x9B7C    0x00000000 (0)
0x8950    0xfffcf001 (-200703)
0x98FC    0x00000000 (0)

With commit 416a2bd2 reverted (working) :

0x98F4    0x00000001 (1)
0x3F88    0x00000001 (1)
0x9B7C    0x00fe0000 (16646144)
0x8950    0xfffcf001 (-200703)
0x98FC    0x00000000 (0)

So, value of register GC_USER_RB_BACKEND_DISABLE (0x9B7C) differs.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #3 from Jérôme Glisse <glisse@freedesktop.org>  2012-07-03 15:42:09 ---
Created an attachment (id=74671)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=74671)
 properly disable render backend

Does this patch fix it ?

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #4 from Jean Delvare <khali@linux-fr.org>  2012-07-03 16:21:27 ---
I tested the patch in comment #3 but unfortunately it doesn't solve the
problem.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #5 from Jean Delvare <khali@linux-fr.org>  2012-07-03 16:39:19 ---
With this patch applied, I get:

0x98F4    0x00000001 (1)
0x3F88    0x00000001 (1)
0x9B7C    0x00fe0000 (16646144)
0x8950    0xfffcf001 (-200703)
0x98FC    0x00000000 (0)
0x8954    0x00000000 (0)

So the value of register 0x9B7C is correct now, but this was not sufficient.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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Jérôme Glisse <glisse@freedesktop.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #74671|0                           |1
        is obsolete|                            |




--- Comment #6 from Jérôme Glisse <glisse@freedesktop.org>  2012-07-03 17:09:41 ---
Created an attachment (id=74701)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=74701)
properly disable render backend

This one ?

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #7 from Alex Deucher <alexdeucher@gmail.com>  2012-07-03 17:31:40 ---
Created an attachment (id=74711)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=74711)
possible fix

or this variant.  Although AFAIK, programming the USER register variants
shouldn't be necessary as the default values (0) are valid.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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--- Comment #8 from Alex Deucher <alexdeucher@gmail.com>  2012-07-03 18:00:24 ---
Does booting up a clean kernel without any patches applied or reverted work if
you manually set the following registers to their "patch reverted" values using
radeonreg? Just to be sure, write all of them even if the values are the same. 
Do this without X running.

0x98F4
0x3F88
0x9B7C
0x8950
0x98FC
0x8954

e.g.,
radeonreg regset 0x8950 0xfffcf001

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--- Comment #9 from Jean Delvare <khali@linux-fr.org>  2012-07-03 18:08:29 ---
Patch from comment #6 doesn't work, testing patch from comment #7 now.

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--- Comment #10 from Jean Delvare <khali@linux-fr.org>  2012-07-03 18:56:15 ---
Patch from comment #7 did not work either. Then I followed the instructions
from comment #8, but it also did not help.

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[Bug 44121] Reproducible GPU lockup CP stall on Radeon HD 6450

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Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #74711|0                           |1
        is obsolete|                            |




--- Comment #11 from Alex Deucher <alexdeucher@gmail.com>  2012-07-03 19:03:52 ---
Created an attachment (id=74771)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=74771)
possible fix

Another possible fix, but I don't think it will help as it touches things never
previously touched.  I don't think the issue is the USER registers, but it's
worth a shot I suppose.

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--- Comment #12 from Jean Delvare <khali@linux-fr.org>  2012-07-03 21:40:52 ---
Patch from comment #11 didn't work at all, not only it didn't fix the original
issue but it even caused additional trouble (gdm wouldn't even show up.)

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--- Comment #13 from Jean Delvare <khali@linux-fr.org>  2012-07-05 07:30:03 ---
Reproducibility information:

* I cannot reproduce the GPU lockup on a Radeon HD 4350 card.

* On the Radeon HD 6450, I can reproduce the GPU lockup with applications other
than Firefox. I was able to do so with Claws Mail for example. The parent
window has to be maximized for it to happen. Then, as soon as a title-less
dialog box is opened (for example by pressing Ctrl+S for "Save As..."), the GPU
lockup happens.

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Jean Delvare <khali@linux-fr.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #74771|0                           |1
        is obsolete|                            |




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Jean Delvare <khali@linux-fr.org> changed:

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




--- Comment #14 from Jean Delvare <khali@linux-fr.org>  2012-07-06 12:09:24 ---
I managed to fix the problem with a user-space stack update. I updated:

* libdrm from version 2.4.26 to 2.4.33
* Mesa from version 7.11 to 8.0.3
* from xorg-x11-libX11 version 7.6 to libX11 version 1.5.0

and I no longer see the GPU lockup. So I guess I can close this bug as invalid,
if the actual bug was in user-space.

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--- Comment #15 from Alex Deucher <alexdeucher@gmail.com>  2012-07-06 13:13:17 ---
That's the problem with GPU drivers.  It's impossible to test every combination
of userspace and kernel drivers and there can be very subtle bugs with certain
combinations like this one that are almost impossible to track down.

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