Nouveau - Nov 2010 - [Bug 31637] New: NV30, PFIFO_CACHE_ERROR when stopping kdm

https://bugs.freedesktop.org/show_bug.cgi?id=31637

           Summary: NV30, PFIFO_CACHE_ERROR when stopping kdm
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: patmandin at gmail.com
         QAContact: xorg-team at lists.x.org


Created an attachment (id=40285)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40285)
Logged kernel messages when stopping kdm

I have this problem since a long time, but did not bother making a bug report
as it does not hang the machine; and a recent message on nouveau mailing list
reminding me of it. Here is what happens:

vt1 -> text console
vt7 -> kdm or logged kde session running

If I run /etc/init.d/kdm stop from the text console, I got the
PFIFO_CACHE_ERROR, if I do it from an X terminal in the kde session, no errors
happens.

Restarting the server from kdm login screen also does not produce errors.

Using gdm does not trigger the error in any case, so it's something specific
to
kdm (from my pov). Also the fact I stop kdm from a different virtual console
may be important.

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https://bugs.freedesktop.org/show_bug.cgi?id=31637

--- Comment #1 from Patrice Mandin <patmandin at gmail.com> 2010-11-18
12:26:26 PST ---
Just noticed that in my log: the first error happens on channel with object
0x8a (NVXX_IMAGE_FROM_CPU), the following errors happen on a different channel
with object 0x39 (NVXX_MEMORY_TO_MEMORY_FORMAT) however the called methods
match the first object.

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https://bugs.freedesktop.org/show_bug.cgi?id=31637

--- Comment #2 from Patrice Mandin <patmandin at gmail.com> 2010-11-18
13:46:38 PST ---
I just compared timing info (from both kernel and X log files), and the error
happens after nouveau_channel_free() has been called, from NVTakedownDma() in
the DDX.

So it appears something is not totally cleaned up, and the fifo is still
executing commands.

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--- Comment #3 from Francisco Jerez <currojerez at riseup.net> 2010-11-18
14:11:38 PST ---
Created an attachment (id=40400)
 View: https://bugs.freedesktop.org/attachment.cgi?id=40400
 Review: https://bugs.freedesktop.org/review?bug=31637&attachment=40400

nouveau_grobj_sync.patch

This patch might help.

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--- Comment #4 from Patrice Mandin <patmandin at gmail.com> 2010-11-18
23:41:25 PST ---
Created an attachment (id=40403)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40403)
Kernel log with patch and more debug message

Your patch does not change anything. I also added some debug messages in
nouveau_channel_idle() at start and end of the function, and the error appears
in the middle of it.

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--- Comment #5 from Francisco Jerez <currojerez at riseup.net> 2010-11-19
09:44:29 PST ---
Created an attachment (id=40409)
 View: https://bugs.freedesktop.org/attachment.cgi?id=40409
 Review: https://bugs.freedesktop.org/review?bug=31637&attachment=40409

nvfx_screen_destroy_flush.patch

(In reply to comment #4)
> Created an attachment (id=40403)
 -->
(https://bugs.freedesktop.org/attachment.cgi?id=40403)
> Kernel log with patch and more debug message
> 
> Your patch does not change anything. I also added some debug messages in
> nouveau_channel_idle() at start and end of the function, and the error
appears
> in the middle of it.
Right, you'll need this mesa patch in addition to the other one.

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--- Comment #6 from Patrice Mandin <patmandin at gmail.com> 2010-11-19
11:13:32 PST ---
This mesa patch does not change anything (obviously, because I have nothing
running that may be using mesa, and system-wide the software renderer is used).

However, when running glxgears with nouveau mesa backend, sometimes the error
does not trigger (with or without the mesa patch).

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Francisco Jerez <currojerez at riseup.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #40409|0                           |1
        is obsolete|                            |

--- Comment #7 from Francisco Jerez <currojerez at riseup.net> 2010-11-20
05:41:32 PST ---
Created an attachment (id=40434)
 View: https://bugs.freedesktop.org/attachment.cgi?id=40434
 Review: https://bugs.freedesktop.org/review?bug=31637&attachment=40434

libdrm_gpuobj_flush.patch

This libdrm patch along with "nouveau_grobj_sync.patch" should fix
both your
KDM issue and the gallium issue that was reported earlier.

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--- Comment #8 from Patrice Mandin <patmandin at gmail.com> 2010-11-20
12:01:45 PST ---
With patched libdrm, no error triggers, and I even removed the patch to DDX to
be sure :).

So kernel+libdrm patch seems ok to me.

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Francisco Jerez <currojerez at riseup.net> changed:

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

--- Comment #9 from Francisco Jerez <currojerez at riseup.net> 2010-11-21
18:54:43 PST ---
(In reply to comment #8)
> With patched libdrm, no error triggers, and I even removed the patch to DDX
to
> be sure :).
> 
> So kernel+libdrm patch seems ok to me.
This should be fixed in master now.

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