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

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gt/gen8_ppgtt.h b/drivers/gpu/drm/i915/gt/gen8_ppgtt.h
index 76a08b9c1f5c..b9028c2ad3c7 100644
--- a/drivers/gpu/drm/i915/gt/gen8_ppgtt.h
+++ b/drivers/gpu/drm/i915/gt/gen8_ppgtt.h
@@ -6,8 +6,15 @@
 #ifndef __GEN8_PPGTT_H__
 #define __GEN8_PPGTT_H__
 
+#include <linux/kernel.h>
+
+struct i915_address_space;
 struct intel_gt;
+enum i915_cache_level;
 
 struct i915_ppgtt *gen8_ppgtt_create(struct intel_gt *gt);
+u64 gen8_ggtt_pte_encode(dma_addr_t addr,
+			 enum i915_cache_level level,
+			 u32 flags);
 
 #endif