KMS and TTM questions

James Simmons jsimmons at
Tue Oct 4 07:43:07 PDT 2011

> >> Without code to look at we all can start guessing :) my guess is either
> >> you are not using the proper offset field or you are allocating from
> >> different memory pool.
> >
> >
> >
> >From quick glimpse ttm_bo_allocate in via/init_ttm.c loose the
> TTM_PL_FLAG_NO_EVICT so you vq buffer is not allocated with the no
> evict flags, then i guess it got evicted on first bo allocation which
> is strange, maybe first bo has some lpfn constraint.

Tried it and it didn't help. Its the ttm_buffer_object offset that should
vary for each buffer object created from some memory pool. That 
offset is set from bo->mem.mm_node if it is present. Looking at the 
code ttm_bo_init should end up calling ttm_bo_move_buffer which should in 
turn set up the bo->mem.mm_node. I guess I really need to debug the code 
to see what is going on.

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