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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2010-12-10 14:56:42 +0000
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-01-11 14:32:06 -0500
commita12b4eb34bb1ea16046c5b61e7a887e252cc1cce (patch)
tree75383facce24cc1f7f9ddab6becf76b24365d3ca
parent289b777eac19c811b474593b4d2fd14e46340c23 (diff)
downloadop-kernel-dev-a12b4eb34bb1ea16046c5b61e7a887e252cc1cce.zip
op-kernel-dev-a12b4eb34bb1ea16046c5b61e7a887e252cc1cce.tar.gz
xen gntdev: use gnttab_map_refs and gnttab_unmap_refs
Use gnttab_map_refs and gnttab_unmap_refs to map and unmap the grant ref, so that we can have a corresponding struct page. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
-rw-r--r--drivers/xen/gntdev.c37
1 files changed, 30 insertions, 7 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index aba76d4..1e31cdc 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -71,6 +71,7 @@ struct grant_map {
struct ioctl_gntdev_grant_ref *grants;
struct gnttab_map_grant_ref *map_ops;
struct gnttab_unmap_grant_ref *unmap_ops;
+ struct page **pages;
};
/* ------------------------------------------------------------------ */
@@ -94,6 +95,7 @@ static void gntdev_print_maps(struct gntdev_priv *priv,
static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
{
struct grant_map *add;
+ int i;
add = kzalloc(sizeof(struct grant_map), GFP_KERNEL);
if (NULL == add)
@@ -102,11 +104,19 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
add->grants = kzalloc(sizeof(add->grants[0]) * count, GFP_KERNEL);
add->map_ops = kzalloc(sizeof(add->map_ops[0]) * count, GFP_KERNEL);
add->unmap_ops = kzalloc(sizeof(add->unmap_ops[0]) * count, GFP_KERNEL);
- if (NULL == add->grants ||
- NULL == add->map_ops ||
- NULL == add->unmap_ops)
+ add->pages = kzalloc(sizeof(add->pages[0]) * count, GFP_KERNEL);
+ if (NULL == add->grants ||
+ NULL == add->map_ops ||
+ NULL == add->unmap_ops ||
+ NULL == add->pages)
goto err;
+ for (i = 0; i < count; i++) {
+ add->pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
+ if (add->pages[i] == NULL)
+ goto err;
+ }
+
add->index = 0;
add->count = count;
add->priv = priv;
@@ -117,6 +127,12 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
return add;
err:
+ if (add->pages)
+ for (i = 0; i < count; i++) {
+ if (add->pages[i])
+ __free_page(add->pages[i]);
+ }
+ kfree(add->pages);
kfree(add->grants);
kfree(add->map_ops);
kfree(add->unmap_ops);
@@ -191,8 +207,17 @@ static int gntdev_del_map(struct grant_map *map)
static void gntdev_free_map(struct grant_map *map)
{
+ int i;
+
if (!map)
return;
+
+ if (map->pages)
+ for (i = 0; i < map->count; i++) {
+ if (map->pages[i])
+ __free_page(map->pages[i]);
+ }
+ kfree(map->pages);
kfree(map->grants);
kfree(map->map_ops);
kfree(map->unmap_ops);
@@ -226,8 +251,7 @@ static int map_grant_pages(struct grant_map *map)
int i, err = 0;
pr_debug("map %d+%d\n", map->index, map->count);
- err = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
- map->map_ops, map->count);
+ err = gnttab_map_refs(map->map_ops, map->pages, map->count);
if (err)
return err;
@@ -244,8 +268,7 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages)
int i, err = 0;
pr_debug("map %d+%d [%d+%d]\n", map->index, map->count, offset, pages);
- err = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
- map->unmap_ops + offset, pages);
+ err = gnttab_unmap_refs(map->unmap_ops + offset, map->pages, pages);
if (err)
return err;
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