Add an interface to rebind AGP DMA mappings. To be used by the upcoming KMS

support to reload bindings after suspend/resume and to update cachability
flags in the address translation table entries.

3 files changed, 22 insertions, 4 deletions

diff --git a/sys/arch/i386/i386/sg_dma.c b/sys/arch/i386/i386/sg_dma.c
index 1f45bf21c83..afbfb0aa0ad 100644
--- a/sys/arch/i386/i386/sg_dma.c
+++ b/sys/arch/i386/i386/sg_dma.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sg_dma.c,v 1.7 2011/04/07 15:30:15 miod Exp $	*/
+/*	$OpenBSD: sg_dma.c,v 1.8 2013/03/17 21:49:00 kettenis Exp $	*/
 /*
  * Copyright (c) 2009 Owain G. Ainsworth <oga@openbsd.org>
  *
@@ -786,6 +786,18 @@ sg_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map)
 	_bus_dmamap_unload(t, map);
 }
 
+/* 
+ * Reload a dvmamap.
+ */
+void
+sg_dmamap_reload(bus_dma_tag_t t, bus_dmamap_t map, int flags)
+{
+	struct sg_cookie	*is = t->_cookie;
+	struct sg_page_map	*spm = map->_dm_cookie;
+
+	sg_iomap_load_map(is, spm, spm->spm_start, flags);
+}
+
 /*
  * Alloc dma safe memory, telling the backend that we're scatter gather
  * to ease pressure on the vm.
diff --git a/sys/arch/i386/include/bus.h b/sys/arch/i386/include/bus.h
index a6b79e9333a..a0bfb337f98 100644
--- a/sys/arch/i386/include/bus.h
+++ b/sys/arch/i386/include/bus.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bus.h,v 1.57 2013/01/29 01:15:57 dlg Exp $	*/
+/*	$OpenBSD: bus.h,v 1.58 2013/03/17 21:49:00 kettenis Exp $	*/
 /*	$NetBSD: bus.h,v 1.6 1996/11/10 03:19:25 thorpej Exp $	*/
 
 /*-
@@ -693,8 +693,8 @@ int	sg_dmamap_load_buffer(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
 	    struct proc *, int, int *, int);
 int	sg_dmamap_load_physarray(bus_dma_tag_t, bus_dmamap_t, paddr_t *,
 	    int, int, int *, int);
+void	sg_dmamap_reload(bus_dma_tag_t, bus_dmamap_t, int);
 int	sg_dmamem_alloc(bus_dma_tag_t, bus_size_t, bus_size_t, bus_size_t,
 	    bus_dma_segment_t *, int, int *, int);
 
-
 #endif /* _MACHINE_BUS_H_ */
diff --git a/sys/arch/i386/pci/agp_machdep.c b/sys/arch/i386/pci/agp_machdep.c
index e6eaa41a00c..c6634a99dc4 100644
--- a/sys/arch/i386/pci/agp_machdep.c
+++ b/sys/arch/i386/pci/agp_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: agp_machdep.c,v 1.12 2010/05/10 22:06:04 oga Exp $	*/
+/*	$OpenBSD: agp_machdep.c,v 1.13 2013/03/17 21:49:00 kettenis Exp $	*/
 
 /*
  * Copyright (c) 2008 - 2009 Owain G. Ainsworth <oga@openbsd.org>
@@ -174,6 +174,12 @@ agp_bus_dma_set_alignment(bus_dma_tag_t tag, bus_dmamap_t dmam,
 	sg_dmamap_set_alignment(tag, dmam, alignment);
 }
 
+void
+agp_bus_dma_rebind(bus_dma_tag_t tag, bus_dmamap_t dmam, int flags)
+{
+	sg_dmamap_reload(tag, dmam, flags);
+}
+
 struct agp_map {
 	bus_space_tag_t	bst;
 	bus_addr_t	addr;