[Intel-gfx] [PATCH 10/37] drm/i915: add pcie snoop flag

[Chris Wilson]

Quoting Lucas De Marchi (2020-05-21 01:37:36)
> From: Matthew Auld <matthew.auld at intel.com>
> 
> Gen 12 dgfx devices are coherent with system memory even over PCIe.
> Therefore supporting coherent userptr should be possible.

Then set has-snoop with a comment that it is over PCIe. This patch only
covers one cache-coherent usecase, not all of them. Why not?
-Chris