freedreno: add handle and name tracking

Due to the evil userspace buffer tracking we have to do, and hacks for
creating GEM buffer from fbdev/scanout, "evil-twin" fd_bo objects are
problematic.  So introduce hashtable tracking of bo's and dev's, to
avoid getting duplicate fd_bo ptrs for the same underlying gem object,
in particular when importing via flink name.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/freedreno/freedreno_priv.h b/freedreno/freedreno_priv.h
index 0edca1d9..433bd300 100644
--- a/freedreno/freedreno_priv.h
+++ b/freedreno/freedreno_priv.h
@@ -37,6 +37,7 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <sys/mman.h>
+#include <pthread.h>
 
 #include "xf86drm.h"
 #include "xf86atomic.h"
@@ -49,6 +50,18 @@
 
 struct fd_device {
         int fd;
+        atomic_t refcnt;
+
+        /* tables to keep track of bo's, to avoid "evil-twin" fd_bo objects:
+         *
+         *   handle_table: maps handle to fd_bo
+         *   name_table: maps flink name to fd_bo
+         *
+         * We end up needing two tables, because DRM_IOCTL_GEM_OPEN always
+         * returns a new handle.  So we need to figure out if the bo is already
+         * open in the process first, before calling gem-open.
+         */
+        void *handle_table, *name_table;
 };
 
 struct fd_pipe {