From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
drivers/xen/gntdev.c | 37 ++++++++++++++++++++++++++++++-------
1 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index fc5e420..35de6bb 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -68,6 +68,7 @@ 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;
};
/* ------------------------------------------------------------------ */
@@ -88,6 +89,7 @@ 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)
@@ -96,11 +98,19 @@ 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;
@@ -111,6 +121,12 @@ 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);
@@ -186,8 +202,17 @@ static int gntdev_del_map(struct grant_map *map)
static void gntdev_free_map(struct grant_map *map)
{
+ unsigned 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);
@@ -221,8 +246,7 @@ static int map_grant_pages(struct grant_map *map)
if (debug)
printk("%s: map %d+%d\n", __FUNCTION__, 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 (WARN_ON(err))
return err;
@@ -241,8 +265,7 @@ static int unmap_grant_pages(struct grant_map *map, int
offset, int pages)
if (debug)
printk("%s: map %d+%d [%d+%d]\n", __FUNCTION__,
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 (WARN_ON(err))
return err;
--
1.5.6.5
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