[PATCH v3 2/8] ttm: turn ttm_bo_device.vma_manager into a pointer

[Gerd Hoffmann]

On Thu, Aug 08, 2019 at 09:48:49AM +0000, Koenig, Christian wrote:
> Am 08.08.19 um 11:36 schrieb Gerd Hoffmann:
> > Rename the embedded struct vma_offset_manager, it is named _vma_manager
> > now.  ttm_bo_device.vma_manager is a pointer now, pointing to the
> > embedded ttm_bo_device._vma_manager by default.
> >
> > Add ttm_bo_device_init_with_vma_manager() function which allows to
> > initialize ttm with a different vma manager.
> 
> Can't we go down the route of completely removing the vma_manager from 
> TTM? ttm_bo_mmap() would get the BO as parameter instead.

It surely makes sense to target that.  This patch can be a first step
into that direction.  It allows gem and ttm to use the same
vma_offset_manager (see patch #3), which in turn makes various gem
functions work on ttm objects (see patch #4 for vram helpers).

> That would also make the verify_access callback completely superfluous 
> and looks like a good step into the right direction of de-midlayering.

Hmm, right, noticed that too while working on another patch series.
Guess I'll try to merge those two and see where I end up ...

cheers,
  Gerd