Re: Debugging registers (INSTPS, CSCMDOP, CSCMDVLD, ...)

[Dave Gordon <david.s.gordon@intel.com>]

On 15/01/15 07:38, Jaeyong Yoo wrote:
> Hello Daniel and other maintainers,
> 
> While I'm working on drm memory allocator with myself, I've encountered render ring hang.
> And I am noticed that I can diagnose the command streamer's status with the following registers:
> 
> INSTPS: 0x2070
> CSCMDOP: 0x220c
> CSCMDVLD: 0x2210
> INSTDONE_1: 206C
> 
> I can see the general description of such registers in the following PDF.
> http://www.x.org/docs/intel/VOL_1_graphics_core.pdf
> 
> But, sadly, this document does not provide a field description for implementation specific registers.
> I appreciate if you point me to such information in Haswell architecture?
> 
> Best regards,
> JY
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

Hi,

have you looked at intel-gpu-tools, available from
http://cgit.freedesktop.org/xorg/app/intel-gpu-tools/ ?

It includes tools to decode specific registers (such as INSTDONE) and
describe what the various bits mean (have a look at lib/instdone.c).

There's also a tool to decode an error dump, which is a commonly used
means of tracking down a GPU hang.

Hope this helps,
.Dave.

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