agp: add chipset flushing support to AGP interface

This bumps the AGP interface to 0.103.

Certain Intel chipsets contains a global write buffer, and this can require
flushing from the drm or X.org to make sure all data has hit RAM before
initiating a GPU transfer, due to a lack of coherency with the integrated
graphics device and this buffer.

This just adds generic support to the AGP interfaces, a follow-on patch
will add support to the Intel driver to use this interface.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index b83824c41329..9ec9374ccc42 100644
--- a/drivers/char/agp/agp.h
+++ b/drivers/char/agp/agp.h
@@ -117,7 +117,8 @@ struct agp_bridge_driver {
         void (*free_by_type)(struct agp_memory *);
         void *(*agp_alloc_page)(struct agp_bridge_data *);
         void (*agp_destroy_page)(void *, int flags);
-        int (*agp_type_to_mask_type) (struct agp_bridge_data *, int);
+        int (*agp_type_to_mask_type) (struct agp_bridge_data *, int);
+        void (*chipset_flush)(struct agp_bridge_data *);
 };
 
 struct agp_bridge_data {