drm/radeon/kms: add MSAA texture support for r600-evergreen

Most of the checking seems to be in place already. As you can see,
log2(number of samples) resides in LAST_LEVEL.

This is required for MSAA support (namely for depth-stencil resolve and
blitting between MSAA resources).

Signed-off-by: Marek Olšák <maraeo@gmail.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/evergreen_cs.c

@@ -788,6 +788,13 @@ static int evergreen_cs_track_validate_texture(struct radeon_cs_parser *p,
 	case V_030000_SQ_TEX_DIM_1D_ARRAY:
 	case V_030000_SQ_TEX_DIM_2D_ARRAY:
 		depth = 1;
+		break;
+	case V_030000_SQ_TEX_DIM_2D_MSAA:
+	case V_030000_SQ_TEX_DIM_2D_ARRAY_MSAA:
+		surf.nsamples = 1 << llevel;
+		llevel = 0;
+		depth = 1;
+		break;
 	case V_030000_SQ_TEX_DIM_3D:
 		break;
 	default:

drivers/gpu/drm/radeon/r600_cs.c

@@ -1620,8 +1620,13 @@ static int r600_check_texture_resource(struct radeon_cs_parser *p,  u32 idx,
 	case V_038000_SQ_TEX_DIM_2D_ARRAY:
 		is_array = true;
 		break;
-	case V_038000_SQ_TEX_DIM_2D_MSAA:
 	case V_038000_SQ_TEX_DIM_2D_ARRAY_MSAA:
+		is_array = true;
+		/* fall through */
+	case V_038000_SQ_TEX_DIM_2D_MSAA:
+		array_check.nsamples = 1 << llevel;
+		llevel = 0;
+		break;
 	default:
 		dev_warn(p->dev, "this kernel doesn't support %d texture dim\n", G_038000_DIM(word0));
 		return -EINVAL;

drivers/gpu/drm/radeon/radeon_drv.c

@@ -60,9 +60,10 @@
  *   2.16.0 - fix evergreen 2D tiled surface calculation
  *   2.17.0 - add STRMOUT_BASE_UPDATE for r7xx
  *   2.18.0 - r600-eg: allow "invalid" DB formats
+ *   2.19.0 - r600-eg: MSAA textures
  */
 #define KMS_DRIVER_MAJOR	2
-#define KMS_DRIVER_MINOR	18
+#define KMS_DRIVER_MINOR	19
 #define KMS_DRIVER_PATCHLEVEL	0
 int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags);
 int radeon_driver_unload_kms(struct drm_device *dev);