intel/KVMGT-kernel

Some debug registers

Opened this issue · 3 comments

Jaeyong-Yoo commented

While I'm having some fun on drm memory allocator in kvmGT, 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?

l1viathan commented

Hi Jaeyong, Intel releases its GPU PRM on 01.org. As for HSW, the manuals can be found at :

https://01.org/linuxgraphics/documentation/2013-intel-core-processor-family

Jaeyong-Yoo commented

Thanks for the answer.
I searched in the "HSW - Volume 2c: Command Reference: Registers" one and I can not see INSTPS nor 2070. I think this PRM is not including all registers.

l1viathan commented

Unfortunately I didn't find it either.
Actually we use an internal version of GEN manuals, which is more detailed. By occasion there are things missing in the published ones. Sorry for that..