vmwgfx: Fix up query processing

[firefly-linux-kernel-4.4.55.git] / drivers / gpu / drm / vmwgfx / vmwgfx_fifo.c

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
index d7ed33e732a0971bac7848737b12b5d5202f721e..62d6377b8ee8294f8bfad60e05d8918b13d046d2 100644 (file)
--- 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;
+}