commit a13af4b4d842da6d7065b8c73fa8f0ac58fea1b6
author Dave Airlie <airlied@linux.ie> Mon Oct 29 15:14:03 2007 +1000
committer Dave Airlie <airlied@redhat.com> Tue Feb 05 14:33:32 2008 +1000
tree 3269002c62ee1f10728cfa5a9782225329166d6b
parent 9ef9dc69d4167276c04590d67ee55de8380bc1ad

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>

include/linux/agpgart.h

diff --git a/include/linux/agpgart.h b/include/linux/agpgart.h
index 09fbf7e..62aef58 100644
--- a/include/linux/agpgart.h
+++ b/include/linux/agpgart.h
@@ -38,6 +38,7 @@
 #define AGPIOC_DEALLOCATE _IOW (AGPIOC_BASE, 7, int)
 #define AGPIOC_BIND       _IOW (AGPIOC_BASE, 8, struct agp_bind*)
 #define AGPIOC_UNBIND     _IOW (AGPIOC_BASE, 9, struct agp_unbind*)
+#define AGPIOC_CHIPSET_FLUSH _IO (AGPIOC_BASE, 10)
 
 #define AGP_DEVICE      "/dev/agpgart"