anv: Implement support for exporting semaphores as FENCE_FD

Reviewed-by: Lionel Landwerlin <[email protected]>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/intel/vulkan/anv_gem.c b/src/intel/vulkan/anv_gem.c
index 36692f567ca..40ef9144e6c 100644
--- a/src/intel/vulkan/anv_gem.c
+++ b/src/intel/vulkan/anv_gem.c
@@ -22,6 +22,7 @@
  */
 
 #include <sys/ioctl.h>
+#include <sys/types.h>
 #include <sys/mman.h>
 #include <string.h>
 #include <errno.h>
@@ -400,3 +401,38 @@ anv_gem_fd_to_handle(struct anv_device *device, int fd)
 
    return args.handle;
 }
+
+#ifndef SYNC_IOC_MAGIC
+/* duplicated from linux/sync_file.h to avoid build-time dependency
+ * on new (v4.7) kernel headers.  Once distro's are mostly using
+ * something newer than v4.7 drop this and #include <linux/sync_file.h>
+ * instead.
+ */
+struct sync_merge_data {
+   char  name[32];
+   __s32 fd2;
+   __s32 fence;
+   __u32 flags;
+   __u32 pad;
+};
+
+#define SYNC_IOC_MAGIC '>'
+#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
+#endif
+
+int
+anv_gem_sync_file_merge(struct anv_device *device, int fd1, int fd2)
+{
+   const char name[] = "anv merge fence";
+   struct sync_merge_data args = {
+      .fd2 = fd2,
+      .fence = -1,
+   };
+   memcpy(args.name, name, sizeof(name));
+
+   int ret = anv_ioctl(fd1, SYNC_IOC_MERGE, &args);
+   if (ret == -1)
+      return -1;
+
+   return args.fence;
+}