From: CQ Tang cq.tang@intel.com
Gen12+ devices 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 Gen12.5 devices(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 --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/i915_pci.c | 1 + drivers/gpu/drm/i915/intel_device_info.h | 1 + 3 files changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index a16fde38a252..57948e0ee48b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1721,6 +1721,8 @@ 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)
+#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 8ef484a23652..68367b505dc4 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -991,6 +991,7 @@ 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 dd453b96af19..87ee1d86d2ac 100644 --- a/drivers/gpu/drm/i915/intel_device_info.h +++ b/drivers/gpu/drm/i915/intel_device_info.h @@ -126,6 +126,7 @@ enum intel_ppgtt_type { func(has_64k_pages); \ func(gpu_reset_clobbers_display); \ func(has_reset_engine); \ + func(has_flat_ccs); \ func(has_global_mocs); \ func(has_gt_uc); \ func(has_l3_dpf); \