r600g: implement texture barrier

src/gallium/drivers/r600/evergreen_state.c

@@ -920,6 +920,7 @@ void evergreen_init_state_functions(struct r600_pipe_context *rctx)
 	rctx->context.set_viewport_state = evergreen_set_viewport_state;
 	rctx->context.sampler_view_destroy = r600_sampler_view_destroy;
 	rctx->context.redefine_user_buffer = u_default_redefine_user_buffer;
+	rctx->context.texture_barrier = r600_texture_barrier;
 }
 
 void evergreen_init_config(struct r600_pipe_context *rctx)

src/gallium/drivers/r600/r600.h

@@ -290,6 +290,7 @@ void r600_query_predication(struct r600_context *ctx, struct r600_query *query,
 			    int flag_wait);
 void r600_context_emit_fence(struct r600_context *ctx, struct r600_bo *fence,
                              unsigned offset, unsigned value);
+void r600_context_flush_all(struct r600_context *ctx, unsigned flush_flags);
 
 int evergreen_context_init(struct r600_context *ctx, struct radeon *radeon);
 void evergreen_context_draw(struct r600_context *ctx, const struct r600_draw *draw);

src/gallium/drivers/r600/r600_pipe.h

@@ -298,6 +298,8 @@ void r600_set_constant_buffer(struct pipe_context *ctx, uint shader, uint index,
 			      struct pipe_resource *buffer);
 void r600_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info);
 
+void r600_texture_barrier(struct pipe_context *ctx);
+
 /*
  * common helpers
  */

src/gallium/drivers/r600/r600_state.c

@@ -934,6 +934,13 @@ static void r600_set_framebuffer_state(struct pipe_context *ctx,
 	}
 }
 
+void r600_texture_barrier(struct pipe_context *ctx)
+{
+	struct r600_pipe_context *rctx = (struct r600_pipe_context *)ctx;
+
+	r600_context_flush_all(&rctx->ctx, S_0085F0_TC_ACTION_ENA(1));
+}
+
 void r600_init_state_functions(struct r600_pipe_context *rctx)
 {
 	rctx->context.create_blend_state = r600_create_blend_state;
@@ -974,6 +981,7 @@ void r600_init_state_functions(struct r600_pipe_context *rctx)
 	rctx->context.set_viewport_state = r600_set_viewport_state;
 	rctx->context.sampler_view_destroy = r600_sampler_view_destroy;
 	rctx->context.redefine_user_buffer = u_default_redefine_user_buffer;
+	rctx->context.texture_barrier = r600_texture_barrier;
 }
 
 void r600_init_config(struct r600_pipe_context *rctx)

src/gallium/winsys/r600/drm/r600_hw_context.c

@@ -771,6 +771,23 @@ static void rv6xx_context_surface_base_update(struct r600_context *ctx,
 	}
 }
 
+/* Flushes all surfaces */
+void r600_context_flush_all(struct r600_context *ctx, unsigned flush_flags)
+{
+	unsigned ndwords = 5;
+
+	if ((ctx->pm4_dirty_cdwords + ndwords + ctx->pm4_cdwords) > ctx->pm4_ndwords) {
+		/* need to flush */
+		r600_context_flush(ctx);
+	}
+
+	ctx->pm4[ctx->pm4_cdwords++] = PKT3(PKT3_SURFACE_SYNC, 3, ctx->predicate_drawing);
+	ctx->pm4[ctx->pm4_cdwords++] = flush_flags;     /* CP_COHER_CNTL */
+	ctx->pm4[ctx->pm4_cdwords++] = 0xffffffff;      /* CP_COHER_SIZE */
+	ctx->pm4[ctx->pm4_cdwords++] = 0;               /* CP_COHER_BASE */
+	ctx->pm4[ctx->pm4_cdwords++] = 0x0000000A;      /* POLL_INTERVAL */
+}
+
 void r600_context_bo_flush(struct r600_context *ctx, unsigned flush_flags,
 				unsigned flush_mask, struct r600_bo *rbo)
 {