From cb613491c89e9800b17ae24feb7a13adc5ce8fe4 Mon Sep 17 00:00:00 2001
From: Owain Ainsworth <oga@cvs.openbsd.org>
Date: Sun, 24 May 2009 02:06:16 +0000
Subject: If flags to bind_page include BUS_DMA_COHERENT, set the snooped bit
 on the pte.

This is currently unused, but will be used soon.
---
 sys/dev/pci/agp_i810.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'sys')

diff --git a/sys/dev/pci/agp_i810.c b/sys/dev/pci/agp_i810.c
index 5bf42fe13af..93e87cb7ff0 100644
--- a/sys/dev/pci/agp_i810.c
+++ b/sys/dev/pci/agp_i810.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: agp_i810.c,v 1.53 2009/05/24 01:40:58 oga Exp $	*/
+/*	$OpenBSD: agp_i810.c,v 1.54 2009/05/24 02:06:15 oga Exp $	*/
 
 /*-
  * Copyright (c) 2000 Doug Rabson
@@ -520,6 +520,13 @@ agp_i810_bind_page(void *sc, bus_addr_t offset, paddr_t physical, int flags)
 {
 	struct agp_i810_softc *isc = sc;
 
+	/*
+	 * COHERENT mappings mean set the snoop bit. this should never be
+	 * accessed by the gpu through the gtt.
+	 */
+	if (flags & BUS_DMA_COHERENT)
+		physical |= INTEL_COHERENT;
+
 	intagp_write_gtt(isc, offset - isc->isc_apaddr, physical);
 }
 
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