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authorDavid Vrabel <david.vrabel@citrix.com>2015-01-05 17:13:41 +0300
committerDavid Vrabel <david.vrabel@citrix.com>2015-01-28 17:03:10 +0300
commit853d0289340026b30f93fd0e768340221d4e605c (patch)
tree17d52ad1d7ae43007d8b664bbdba2a50db7dbb81 /drivers/xen
parentd8ac3dd41aea245f65465449efc35dd3ac71e91d (diff)
downloadlinux-853d0289340026b30f93fd0e768340221d4e605c.tar.xz
xen/grant-table: pre-populate kernel unmap ops for xen_gnttab_unmap_refs()
When unmapping grants, instead of converting the kernel map ops to unmap ops on the fly, pre-populate the set of unmap ops. This allows the grant unmap for the kernel mappings to be trivially batched in the future. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/gntdev.c20
-rw-r--r--drivers/xen/grant-table.c4
2 files changed, 16 insertions, 8 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 073b4a19a8b0..6444172f2842 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -91,6 +91,7 @@ struct grant_map {
struct gnttab_map_grant_ref *map_ops;
struct gnttab_unmap_grant_ref *unmap_ops;
struct gnttab_map_grant_ref *kmap_ops;
+ struct gnttab_unmap_grant_ref *kunmap_ops;
struct page **pages;
};
@@ -124,6 +125,7 @@ static void gntdev_free_map(struct grant_map *map)
kfree(map->map_ops);
kfree(map->unmap_ops);
kfree(map->kmap_ops);
+ kfree(map->kunmap_ops);
kfree(map);
}
@@ -140,11 +142,13 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
add->map_ops = kcalloc(count, sizeof(add->map_ops[0]), GFP_KERNEL);
add->unmap_ops = kcalloc(count, sizeof(add->unmap_ops[0]), GFP_KERNEL);
add->kmap_ops = kcalloc(count, sizeof(add->kmap_ops[0]), GFP_KERNEL);
+ add->kunmap_ops = kcalloc(count, sizeof(add->kunmap_ops[0]), GFP_KERNEL);
add->pages = kcalloc(count, sizeof(add->pages[0]), GFP_KERNEL);
if (NULL == add->grants ||
NULL == add->map_ops ||
NULL == add->unmap_ops ||
NULL == add->kmap_ops ||
+ NULL == add->kunmap_ops ||
NULL == add->pages)
goto err;
@@ -155,6 +159,7 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count)
add->map_ops[i].handle = -1;
add->unmap_ops[i].handle = -1;
add->kmap_ops[i].handle = -1;
+ add->kunmap_ops[i].handle = -1;
}
add->index = 0;
@@ -280,6 +285,8 @@ static int map_grant_pages(struct grant_map *map)
map->flags | GNTMAP_host_map,
map->grants[i].ref,
map->grants[i].domid);
+ gnttab_set_unmap_op(&map->kunmap_ops[i], address,
+ map->flags | GNTMAP_host_map, -1);
}
}
@@ -290,13 +297,14 @@ static int map_grant_pages(struct grant_map *map)
return err;
for (i = 0; i < map->count; i++) {
- if (map->map_ops[i].status)
+ if (map->map_ops[i].status) {
err = -EINVAL;
- else {
- BUG_ON(map->map_ops[i].handle == -1);
- map->unmap_ops[i].handle = map->map_ops[i].handle;
- pr_debug("map handle=%d\n", map->map_ops[i].handle);
+ continue;
}
+
+ map->unmap_ops[i].handle = map->map_ops[i].handle;
+ if (use_ptemod)
+ map->kunmap_ops[i].handle = map->kmap_ops[i].handle;
}
return err;
}
@@ -316,7 +324,7 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
}
err = gnttab_unmap_refs(map->unmap_ops + offset,
- use_ptemod ? map->kmap_ops + offset : NULL, map->pages + offset,
+ use_ptemod ? map->kunmap_ops + offset : NULL, map->pages + offset,
pages);
if (err)
return err;
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 7786291ba229..999d7abdbcec 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -738,7 +738,7 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
EXPORT_SYMBOL_GPL(gnttab_map_refs);
int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
- struct gnttab_map_grant_ref *kmap_ops,
+ struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count)
{
int ret;
@@ -747,7 +747,7 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
if (ret)
return ret;
- return clear_foreign_p2m_mapping(unmap_ops, kmap_ops, pages, count);
+ return clear_foreign_p2m_mapping(unmap_ops, kunmap_ops, pages, count);
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs);