1 files changed, 57 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
index d7ed33e732a0..62d6377b8ee8 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
@@ -505,3 +505,60 @@ int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *seqno)
 out_err:
         return ret;
 }
+
+/**
+ * vmw_fifo_emit_dummy_query - emits a dummy query to the fifo.
+ *
+ * @dev_priv: The device private structure.
+ * @cid: The hardware context id used for the query.
+ *
+ * This function is used to emit a dummy occlusion query with
+ * no primitives rendered between query begin and query end.
+ * It's used to provide a query barrier, in order to know that when
+ * this query is finished, all preceding queries are also finished.
+ *
+ * A Query results structure should have been initialized at the start
+ * of the dev_priv->dummy_query_bo buffer object. And that buffer object
+ * must also be either reserved or pinned when this function is called.
+ *
+ * Returns -ENOMEM on failure to reserve fifo space.
+ */
+int vmw_fifo_emit_dummy_query(struct vmw_private *dev_priv,
+                              uint32_t cid)
+{
+        /*
+         * A query wait without a preceding query end will
+         * actually finish all queries for this cid
+         * without writing to the query result structure.
+         */
+
+        struct ttm_buffer_object *bo = dev_priv->dummy_query_bo;
+        struct {
+                SVGA3dCmdHeader header;
+                SVGA3dCmdWaitForQuery body;
+        } *cmd;
+
+        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
+
+        if (unlikely(cmd == NULL)) {
+                DRM_ERROR("Out of fifo space for dummy query.\n");
+                return -ENOMEM;
+        }
+
+        cmd->header.id = SVGA_3D_CMD_WAIT_FOR_QUERY;
+        cmd->header.size = sizeof(cmd->body);
+        cmd->body.cid = cid;
+        cmd->body.type = SVGA3D_QUERYTYPE_OCCLUSION;
+
+        if (bo->mem.mem_type == TTM_PL_VRAM) {
+                cmd->body.guestResult.gmrId = SVGA_GMR_FRAMEBUFFER;
+                cmd->body.guestResult.offset = bo->offset;
+        } else {
+                cmd->body.guestResult.gmrId = bo->mem.start;
+                cmd->body.guestResult.offset = 0;
+        }
+
+        vmw_fifo_commit(dev_priv, sizeof(*cmd));
+
+        return 0;
+}