drm/i915/xehpsdv: Add has_flat_ccs to device info

Platforms of XeHP and beyond support 3D surface (buffer) compression and
various compression formats. This is accomplished by an additional
compression control state (CCS) stored for each surface.

Gen 12 devices(TGL family and DG1) stores compression states in a separate
region of memory. It is managed by user-space and has an associated set of
user-space managed page tables used by hardware for address translation.

In Xe HP and beyond (XEHPSDV, DG2, etc), there is a new feature introduced
i.e Flat CCS. It replaced AUX page tables with a flat indexed region of
device memory for storing compression states.

Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220218184752.7524-14-ramalingam.c@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1551,6 +1551,12 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_REGION(i915, i) (INTEL_INFO(i915)->memory_regions & (i))
 #define HAS_LMEM(i915) HAS_REGION(i915, REGION_LMEM)
 
+/*
+ * Platform has the dedicated compression control state for each lmem surfaces
+ * stored in lmem to support the 3D and media compression formats.
+ */
+#define HAS_FLAT_CCS(dev_priv)   (INTEL_INFO(dev_priv)->has_flat_ccs)
+
 #define HAS_GT_UC(dev_priv)	(INTEL_INFO(dev_priv)->has_gt_uc)
 
 #define HAS_POOLED_EU(dev_priv)	(INTEL_INFO(dev_priv)->has_pooled_eu)

drivers/gpu/drm/i915/i915_pci.c

@@ -1003,6 +1003,7 @@ static const struct intel_device_info adl_p_info = {
 	XE_HP_PAGE_SIZES, \
 	.dma_mask_size = 46, \
 	.has_64bit_reloc = 1, \
+	.has_flat_ccs = 1, \
 	.has_global_mocs = 1, \
 	.has_gt_uc = 1, \
 	.has_llc = 1, \

drivers/gpu/drm/i915/intel_device_info.h

@@ -131,6 +131,7 @@ enum intel_ppgtt_type {
 	func(needs_compact_pt); \
 	func(gpu_reset_clobbers_display); \
 	func(has_reset_engine); \
+	func(has_flat_ccs); \
 	func(has_global_mocs); \
 	func(has_gt_uc); \
 	func(has_guc_deprivilege); \