From: CQ Tang cq.tang@intel.com
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 --- drivers/gpu/drm/i915/i915_drv.h | 6 ++++++ drivers/gpu/drm/i915/i915_pci.c | 1 + drivers/gpu/drm/i915/intel_device_info.h | 1 + 3 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 4a3ac66e777a..1c2f4ae4ebf9 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1356,6 +1356,12 @@ 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) diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index 8df8887d76ae..f449c454b6f8 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -1005,6 +1005,7 @@ 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, \ diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h index f75673da768d..2508a47fb3f5 100644 --- a/drivers/gpu/drm/i915/intel_device_info.h +++ b/drivers/gpu/drm/i915/intel_device_info.h @@ -134,6 +134,7 @@ 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); \