sna: Preallocate cursors

We need to avoid all allocations within the signal handlers, so
preallocate the cursor structs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77975
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/sna/sna.h b/src/sna/sna.h
index fc73f7e6..1e23ac1e 100644
--- a/src/sna/sna.h
+++ b/src/sna/sna.h
@@ -298,6 +298,8 @@ struct sna {
 		unsigned max_size;
 		bool use_gtt;
 
+		int num_stash;
+		struct sna_cursor *stash;
 		void *scratch;
 	} cursor;