[Nouveau] [Bug 14961] New: NV30: random dma queue hang

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=14961

           Summary: NV30: random dma queue hang
           Product: xorg
           Version: 7.3
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: pmandin at caramail.com
         QAContact: xorg-team at lists.x.org


Sometimes I got this in the kernel logs:

[drm] PGRAPH_ERROR - nSource: LIMIT_ZETA, nStatus: PROTECTION_FAULT
[drm] PGRAPH_ERROR - Ch 2/2 Class 0x009f Mthd 0x0308 Data 0x00000007:0x011c0130

I checked every calls in DDX driver that set data to method 0x308 for class
0x9f (NV12_IMAGE_BLIT), and did not find anything that may cause the error. It
happens either at start time (heavy bus usage, to load everything from disk),
when I move a big window (opaque mode), or sometimes more randomly.

I notice some big lags just before it triggers, and X crashes with DMA queue
hang error. It's like the fifo data has been overwritten. Enabling
NOUVEAU_DMA_DEBUG in DDX did not show anything wrong.

Card is 0x10de:0x0309, NV30GL


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