[Bug 58806] New: failed to create kernel channel, -12 on G4 PPC

[Bug 58806] New: failed to create kernel channel, -12 on G4 PPC

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

          Priority: medium
            Bug ID: 58806
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
           Summary: failed to create kernel channel, -12 on G4 PPC
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: stefan-01bSGNrlLMOzQB+pC5nmwQ@public.gmane.org
          Hardware: PowerPC
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 72184
  --> https://bugs.freedesktop.org/attachment.cgi?id=72184&action=edit
Bisecting between v3.6 and v3.7

The v3.7 version of nouveau fails to set up acceleration, while it does work
for v3.6. We have tried to bisect the problem but stubled on a change we cannot
beyond:

git show 77145f1cbdf8d28b46ff8070ca749bad821e0774 --
drivers/gpu/drm/nouveau/core/subdev/bios/base.c

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #1 from Stefan de Konink <stefan-01bSGNrlLMOzQB+pC5nmwQ@public.gmane.org> ---
Created attachment 72185
  --> https://bugs.freedesktop.org/attachment.cgi?id=72185&action=edit
dmesg including debugging

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #2 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
What we found so far:

Acceleration set up fails like that:
Stacktrace:
nouveau_drm_load
nouveau_accel_init
nouveau_channel_new
nouveau_channel_ind
nouveau_channel_prep
nouveau_bo_map
ttm_bo_kmap
ttm_bo_ioremap
ioremap_wc

ioremap_wc returns NULL. bo->mem.bus.base and bo->mem.bus.offset are 0.
Probably because of this code:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=drivers/char/agp/uninorth-agp.c;h=a32c492baf5cc15001ad6882dc25a14d1be86419;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l125
and ioremap fails because of this:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=blob;f=arch/powerpc/mm/pgtable_32.c;h=6c856fb8c15b01705fb6cf5ff28c0a232d85d3bd;hb=29594404d7fe73cd80eaa4ee8c43dcc53970c60e#l204

Booting with nouveau.agpmode=0 works.

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #3 from Stefan de Konink <stefan-01bSGNrlLMOzQB+pC5nmwQ@public.gmane.org> ---
Created attachment 72187
  --> https://bugs.freedesktop.org/attachment.cgi?id=72187&action=edit
dmesg for linux 3.6.6

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #4 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
http://lists.freedesktop.org/archives/dri-devel/2012-December/032740.html

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

--- Comment #5 from Stefan de Konink <stefan-01bSGNrlLMOzQB+pC5nmwQ@public.gmane.org> ---
I confirm that the fix works on 3.8-rc1

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

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

--- Comment #6 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
This fix just hit Linus' tree.

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[Bug 58806] failed to create kernel channel, -12 on G4 PPC

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=58806

Florian Mickler <florian-sVu6HhrpSfRAfugRpC6u6w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian-sVu6HhrpSfRAfugRpC6u6w@public.gmane.org

--- Comment #7 from Florian Mickler <florian-sVu6HhrpSfRAfugRpC6u6w@public.gmane.org> ---
A patch referencing this bug report has been merged in Linux v3.8-rc3:

commit eda85d6ad490923152544fba0473798b6cc0edf6
Author: Aaro Koskinen <aaro.koskinen-X3B1VOXEql0@public.gmane.org>
Date:   Mon Dec 31 03:34:59 2012 +0200

    drm/nouveau: fix init with agpgart-uninorth

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