Nouveau - Aug 2011 - [Bug 39988] New: [NVA5] Created FIFOs do not work

https://bugs.freedesktop.org/show_bug.cgi?id=39988

           Summary: [NVA5] Created FIFOs do not work
           Product: xorg
           Version: git
          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=50104)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50104)
kernel log with drm.debug=15

I must currently use 'noaccel=1' to use nouveau on my NVA5 (GT 220, 1GB
vram).

While debugging, it appeared the extra created FIFOs simply do not run at all,
and trigger PFIFO_DMA_PUSHER errors, with IB_EMPTY status. The first of these
errors happen in nouveau_dma_init() function, which is the first one to be run
after creation of a new FIFO.

I must add 'vram_pushbuf=1' to kernel parameters to not have these
errors at
start, however, adding 'vram_notify=1' appears to have not effect.

X crashes at start if I do not use 'noaccel=1', with or without
'vram_pushbuf=1', triggering PFIFO_DMA_PUSHER errors, with INVALID_CMD
status.

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Patrice Mandin <patmandin at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #50104|application/octet-stream    |text/plain
          mime type|                            |

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https://bugs.freedesktop.org/show_bug.cgi?id=39988

--- Comment #1 from Patrice Mandin <patmandin at gmail.com> 2011-08-10
14:29:29 PDT ---
Created an attachment (id=50105)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50105)
kernel log, when trying to start X

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--- Comment #2 from Ben Skeggs <skeggsb at gmail.com> 2011-08-10 16:00:55
PDT ---
I've noticed you mention this issue on IRC previously.

Am I misremembering that you also mentioned that some other board doesn't
work
in that machine either?  And that the NVIDIA binary driver does not work?

If the binary driver works, please post a kmmio trace of it.

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--- Comment #3 from Patrice Mandin <patmandin at gmail.com> 2011-08-11
02:54:05 PDT ---
The blob works, and also no problem in Windows either.

I'll do an mmio trace, and also update/retest everything with the nv46.

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--- Comment #4 from Patrice Mandin <patmandin at gmail.com> 2011-08-11
04:05:42 PDT ---
mmio trace uploaded to mmio.dumps at gmail.com

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--- Comment #5 from Ben Skeggs <skeggsb at gmail.com> 2011-08-11 04:14:05
PDT ---
Created an attachment (id=50120)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50120
 Review: https://bugs.freedesktop.org/review?bug=39988&attachment=50120

try harder at forcing vram pushbufs

Thanks for the trace, I shall attempt to look at it tomorrow (bed time now!).

https://bugs.freedesktop.org/show_bug.cgi?id=39988

--- Comment #6 from Patrice Mandin <patmandin at gmail.com> 2011-08-11
07:16:40 PDT ---
Yes, console acceleration works with vram_pushbuf=1.
With your patch, X starts now, albeit showing full garbage.

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--- Comment #7 from Patrice Mandin <patmandin at gmail.com> 2011-08-11
07:17:14 PDT ---
Created an attachment (id=50132)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50132)
X screenshot with patch

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--- Comment #8 from Ben Skeggs <skeggsb at gmail.com> 2011-08-11 17:25:32
PDT ---
Created an attachment (id=50147)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50147
 Review: https://bugs.freedesktop.org/review?bug=39988&attachment=50147

reset pci bus mastering at init time

Hmmm.. Yes, it looks like your card is completely failing to access system
memory for some reason.  I can't believe it's a general issue with us
setting
up page tables etc, we'd surely have seen this report a *lot* more
otherwise..

The binary driver resets PCI bus mastering really early on during init, lets
give that a go for starters..

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--- Comment #9 from Patrice Mandin <patmandin at gmail.com> 2011-08-12
07:00:53 PDT ---
Created an attachment (id=50161)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50161)
X screenshot with pci bus mastering patch

It's a bit better with this second patch. KDE Menu, and many other stuff,
are
readable now, when they were partly full of garbage previously.

I also think it's something specific to my system, as you say. My
motherboard
has Via PT880 chipset, and can support an AGP or a PCI-E video card.

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Patrice Mandin <patmandin at gmail.com> changed:

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

--- Comment #10 from Patrice Mandin <patmandin at gmail.com> 2011-11-23
12:57:28 PST ---
My motherboard BIOS had option "PCIE VC1 Request Queue" set to [Auto].
When
putting this setting as [Disabled], there is no problem anymore, and everything
works correctly.

Will check that is also fixes the issue with my NV46 (bug #32494 ).

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--- Comment #11 from Patrice Mandin <patmandin at gmail.com> 2011-12-06
11:56:01 PST ---
*** Bug 32494 has been marked as a duplicate of this bug. ***

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