freedreno/ir3: Add ir3 intrinsics for tessellation

These provide the iovas for system memory buffers used for
tessellation as well as a new HW specific system value.

Signed-off-by: Kristian H. Kristensen <hoegsberg@google.com>
Acked-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Rob Clark <robdclark@gmail.com>

src/compiler/nir/nir_intrinsics.py

@@ -792,6 +792,12 @@ system_value("vs_vertex_stride_ir3", 1)
 system_value("gs_header_ir3", 1)
 system_value("primitive_location_ir3", 1, indices=[DRIVER_LOCATION])
 
+# System values for freedreno tessellation shaders.
+system_value("hs_patch_stride_ir3", 1)
+system_value("tess_factor_base_ir3", 2)
+system_value("tess_param_base_ir3", 2)
+system_value("tcs_header_ir3", 1)
+
 # IR3-specific load/store intrinsics. These access a buffer used to pass data
 # between geometry stages - perhaps it's explicit access to the vertex cache.
 

src/compiler/shader_enums.c

@@ -255,6 +255,7 @@ gl_system_value_name(gl_system_value sysval)
      ENUM(SYSTEM_VALUE_BARYCENTRIC_CENTROID),
      ENUM(SYSTEM_VALUE_BARYCENTRIC_SIZE),
      ENUM(SYSTEM_VALUE_GS_HEADER_IR3),
+     ENUM(SYSTEM_VALUE_TCS_HEADER_IR3),
    };
    STATIC_ASSERT(ARRAY_SIZE(names) == SYSTEM_VALUE_MAX);
    return NAME(sysval);

src/compiler/shader_enums.h

@@ -642,11 +642,12 @@ typedef enum
    SYSTEM_VALUE_BARYCENTRIC_SIZE,
 
    /**
-    * IR3 specific geometry shader system value that packs invocation id,
-    * thread id and vertex id.  Having this as a nir level system value lets
-    * us do the unpacking in nir.
+    * IR3 specific geometry shader and tesselation control shader system
+    * values that packs invocation id, thread id and vertex id.  Having this
+    * as a nir level system value lets us do the unpacking in nir.
     */
    SYSTEM_VALUE_GS_HEADER_IR3,
+   SYSTEM_VALUE_TCS_HEADER_IR3,
 
    SYSTEM_VALUE_MAX             /**< Number of values */
 } gl_system_value;

src/freedreno/ir3/ir3_compiler_nir.c

@@ -1363,6 +1363,21 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
 	case nir_intrinsic_load_vs_vertex_stride_ir3:
 		dst[0] = create_uniform(b, primitive_param + 1);
 		break;
+	case nir_intrinsic_load_hs_patch_stride_ir3:
+		dst[0] = create_uniform(b, primitive_param + 2);
+		break;
+	case nir_intrinsic_load_patch_vertices_in:
+		dst[0] = create_uniform(b, primitive_param + 3);
+		break;
+	case nir_intrinsic_load_tess_param_base_ir3:
+		dst[0] = create_uniform(b, primitive_param + 4);
+		dst[1] = create_uniform(b, primitive_param + 5);
+		break;
+	case nir_intrinsic_load_tess_factor_base_ir3:
+		dst[0] = create_uniform(b, primitive_param + 6);
+		dst[1] = create_uniform(b, primitive_param + 7);
+		break;
+
 	case nir_intrinsic_load_primitive_location_ir3:
 		idx = nir_intrinsic_driver_location(intr);
 		dst[0] = create_uniform(b, primitive_map + idx);
@@ -1371,6 +1386,9 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
 	case nir_intrinsic_load_gs_header_ir3:
 		dst[0] = ctx->gs_header;
 		break;
+	case nir_intrinsic_load_tcs_header_ir3:
+		dst[0] = ctx->tcs_header;
+		break;
 
 	case nir_intrinsic_load_primitive_id:
 		dst[0] = ctx->primitive_id;

src/freedreno/ir3/ir3_context.h

@@ -80,6 +80,11 @@ struct ir3_context {
 	struct ir3_instruction *primitive_id;
 	struct ir3_instruction *gs_header;
 
+	/* For tessellation shaders: */
+	struct ir3_instruction *patch_vertices_in;
+	struct ir3_instruction *tcs_header;
+	struct ir3_instruction *tess_coord;
+
 	/* Compute shader inputs: */
 	struct ir3_instruction *local_invocation_id, *work_group_id;
 

src/freedreno/ir3/ir3_shader.c

@@ -363,6 +363,8 @@ output_name(struct ir3_shader_variant *so, int i)
 			return "GS_HEADER";
 		case VARYING_SLOT_GS_VERTEX_FLAGS_IR3:
 			return "GS_VERTEX_FLAGS";
+		case VARYING_SLOT_TCS_HEADER_IR3:
+			return "TCS_HEADER";
 		default:
 			return gl_varying_slot_name(so->outputs[i].slot);
 		}

src/freedreno/ir3/ir3_shader.h

@@ -738,6 +738,7 @@ ir3_find_output_regid(const struct ir3_shader_variant *so, unsigned slot)
 
 #define VARYING_SLOT_GS_HEADER_IR3			(VARYING_SLOT_MAX + 0)
 #define VARYING_SLOT_GS_VERTEX_FLAGS_IR3	(VARYING_SLOT_MAX + 1)
+#define VARYING_SLOT_TCS_HEADER_IR3			(VARYING_SLOT_MAX + 2)
 
 
 static inline uint32_t