drm/i915/xelpd: First stab at DPT support

Add support for DPT (display page table). DPT is a
slightly peculiar two level page table scheme used for
tiled scanout buffers (linear uses direct ggtt mapping
still). The plane surface address will point at a page
in the DPT which holds the PTEs for 512 actual pages.
Thus we require 1/512 of the ggttt address space
compared to a direct ggtt mapping.

We create a new DPT address space for each framebuffer and
track two vmas (one for the DPT, another for the ggtt).

TODO:
- Is the i915_address_space approaach sane?
- Maybe don't map the whole DPT to write the PTEs?
- Deal with remapping/rotation? Need to create a
  separate DPT for each remapped/rotated plane I
  guess. Or else we'd need to make the per-fb DPT
  large enough to support potentially several
  remapped/rotated vmas. How large should that be?

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu@intel.com>
Cc: Wilson Chris P <Chris.P.Wilson@intel.com>
Cc: Tang CQ <cq.tang@intel.com>
Cc: Auld Matthew <matthew.auld@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Wilson Chris P <Chris.P.Wilson@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210506161930.309688-5-imre.deak@intel.com

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -102,7 +102,8 @@ intel_plane_duplicate_state(struct drm_plane *plane)
 
 	__drm_atomic_helper_plane_duplicate_state(plane, &intel_state->uapi);
 
-	intel_state->vma = NULL;
+	intel_state->ggtt_vma = NULL;
+	intel_state->dpt_vma = NULL;
 	intel_state->flags = 0;
 
 	/* add reference to fb */
@@ -125,7 +126,9 @@ intel_plane_destroy_state(struct drm_plane *plane,
 			  struct drm_plane_state *state)
 {
 	struct intel_plane_state *plane_state = to_intel_plane_state(state);
-	drm_WARN_ON(plane->dev, plane_state->vma);
+
+	drm_WARN_ON(plane->dev, plane_state->ggtt_vma);
+	drm_WARN_ON(plane->dev, plane_state->dpt_vma);
 
 	__drm_atomic_helper_plane_destroy_state(&plane_state->uapi);
 	if (plane_state->hw.fb)