[Nouveau] nv50 channel takedown

[Maarten Maathuis]

For some reason this
(http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=114432fd006141fa74fb67b2256b2d1dac617d9f)
comes to mind, not that it matches the error exactly, but still,
consider trying a kernel that includes this commit.

Maarten.

On Sun, Dec 12, 2010 at 11:56 AM, Xavier Chantry
<chantry.xavier at gmail.com> wrote:
> I am seeing problems on 2.6.36-rc7 based kernels.
>
> The error always happens during a channel destruction (always gallium
> on channel 3 in my tests), and always looks like this :
> <3>[  612.115977] [drm] nouveau 0000:01:00.0: AIII, invalid/inactive
> channel id 128
> <6>[  612.115987] [drm] nouveau 0000:01:00.0: PGRAPH_DATA_ERROR - Ch
> -1/3 Class 0x5039 Mthd 0x0184 Data 0x00000000:0x00000e02
> <6>[  612.115990] [drm] nouveau 0000:01:00.0: PGRAPH_DATA_ERROR - INVALID_OBJECT
>
> This is associated with screen corruptions, mostly all fonts/icons disappearing.
>
> The oldest commit where I could see the error during a full piglit run :
>
> commit ea645107d204ebb9c6da494b8fc82e03d74e4513
> Author: Ben Skeggs <bskeggs at redhat.com>
> Date:   Tue Oct 12 08:01:59 2010 +1000
>
>    drm/nouveau: fix thinko in channel locking in semaphore path
>
> But I might have seen troubles with older commits (still 2.6.36-rc7 based).
> And I still don't know if the issue is always triggered by the same
> piglit tests or not.
>
> But with a later commit, the issue became much more frequent,
> triggered by many piglit tests, so I could easily isolate one
> (fdo10370) which reproduces the issue almost every time :
>
> commit 36a7ebda99e904a66188c7304d033e81780455e2
> Author: Francisco Jerez <currojerez at riseup.net>
> Date:   Mon Oct 18 03:53:39 2010 +0200
>
>    drm/nouveau: Refactor context destruction to avoid a lock ordering issue.
>
> Reversing pfifo and pgraph destruction order as before, and the issue
> becomes less frequent again.
>
> I would love to know if anyone at all ever managed to reproduce this.
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