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Date: Thu, 26 Mar 2015 20:16:01 +0800
From: Bob Liu <bob.liu@...cle.com>
To: xen-devel@...ts.xenproject.org
Cc: boris.ostrovsky@...cle.com, jennifer.herbert@...rix.com,
david.vrabel@...rix.com, roger.pau@...rix.com,
linux-kernel@...r.kernel.org, konrad.wilk@...cle.com,
Bob Liu <bob.liu@...cle.com>
Subject: [PATCH 2/2] xen/grant: introduce func gnttab_unmap_refs_async_wait_completion()
There are several place using gnttab async unmap and wait for
completion, so move the common code to a function
gnttab_unmap_refs_async_wait_completion().
Signed-off-by: Bob Liu <bob.liu@...cle.com>
---
drivers/block/xen-blkback/blkback.c | 31 +++----------------------------
drivers/xen/gntdev.c | 28 +++-------------------------
drivers/xen/grant-table.c | 29 +++++++++++++++++++++++++++++
include/xen/grant_table.h | 1 +
4 files changed, 36 insertions(+), 53 deletions(-)
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index f59d7c3..0c8da82 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -263,17 +263,6 @@ static void put_persistent_gnt(struct xen_blkif *blkif,
atomic_dec(&blkif->persistent_gnt_in_use);
}
-static void free_persistent_gnts_unmap_callback(int result,
- struct gntab_unmap_queue_data *data)
-{
- struct completion *c = data->data;
-
- /* BUG_ON used to reproduce existing behaviour,
- but is this the best way to deal with this? */
- BUG_ON(result);
- complete(c);
-}
-
static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
unsigned int num)
{
@@ -283,12 +272,7 @@ static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
struct rb_node *n;
int segs_to_unmap = 0;
struct gntab_unmap_queue_data unmap_data;
- struct completion unmap_completion;
-
- init_completion(&unmap_completion);
- unmap_data.data = &unmap_completion;
- unmap_data.done = &free_persistent_gnts_unmap_callback;
unmap_data.pages = pages;
unmap_data.unmap_ops = unmap;
unmap_data.kunmap_ops = NULL;
@@ -308,8 +292,7 @@ static void free_persistent_gnts(struct xen_blkif *blkif, struct rb_root *root,
!rb_next(&persistent_gnt->node)) {
unmap_data.count = segs_to_unmap;
- gnttab_unmap_refs_async(&unmap_data);
- wait_for_completion(&unmap_completion);
+ BUG_ON(gnttab_unmap_refs_async_wait_completion(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
segs_to_unmap = 0;
@@ -330,12 +313,7 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
int segs_to_unmap = 0;
struct xen_blkif *blkif = container_of(work, typeof(*blkif), persistent_purge_work);
struct gntab_unmap_queue_data unmap_data;
- struct completion unmap_completion;
- init_completion(&unmap_completion);
-
- unmap_data.data = &unmap_completion;
- unmap_data.done = &free_persistent_gnts_unmap_callback;
unmap_data.pages = pages;
unmap_data.unmap_ops = unmap;
unmap_data.kunmap_ops = NULL;
@@ -355,9 +333,7 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
if (++segs_to_unmap == BLKIF_MAX_SEGMENTS_PER_REQUEST) {
unmap_data.count = segs_to_unmap;
- gnttab_unmap_refs_async(&unmap_data);
- wait_for_completion(&unmap_completion);
-
+ BUG_ON(gnttab_unmap_refs_async_wait_completion(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
segs_to_unmap = 0;
}
@@ -365,8 +341,7 @@ void xen_blkbk_unmap_purged_grants(struct work_struct *work)
}
if (segs_to_unmap > 0) {
unmap_data.count = segs_to_unmap;
- gnttab_unmap_refs_async(&unmap_data);
- wait_for_completion(&unmap_completion);
+ BUG_ON(gnttab_unmap_refs_async_wait_completion(&unmap_data));
put_free_pages(blkif, pages, segs_to_unmap);
}
}
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index d5bb1a3..7a88524 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -327,30 +327,10 @@ static int map_grant_pages(struct grant_map *map)
return err;
}
-struct unmap_grant_pages_callback_data
-{
- struct completion completion;
- int result;
-};
-
-static void unmap_grant_callback(int result,
- struct gntab_unmap_queue_data *data)
-{
- struct unmap_grant_pages_callback_data* d = data->data;
-
- d->result = result;
- complete(&d->completion);
-}
-
static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
{
int i, err = 0;
struct gntab_unmap_queue_data unmap_data;
- struct unmap_grant_pages_callback_data data;
-
- init_completion(&data.completion);
- unmap_data.data = &data;
- unmap_data.done= &unmap_grant_callback;
if (map->notify.flags & UNMAP_NOTIFY_CLEAR_BYTE) {
int pgno = (map->notify.addr >> PAGE_SHIFT);
@@ -367,11 +347,9 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
unmap_data.pages = map->pages + offset;
unmap_data.count = pages;
- gnttab_unmap_refs_async(&unmap_data);
-
- wait_for_completion(&data.completion);
- if (data.result)
- return data.result;
+ err = gnttab_unmap_refs_async_wait_completion(&unmap_data);
+ if (err)
+ return err;
for (i = 0; i < pages; i++) {
if (map->unmap_ops[offset+i].status)
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 17972fb..1dce9bc 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -123,6 +123,12 @@ struct gnttab_ops {
int (*query_foreign_access)(grant_ref_t ref);
};
+struct unmap_refs_async_callback_data
+{
+ struct completion completion;
+ int result;
+};
+
static struct gnttab_ops *gnttab_interface;
static int grant_table_version;
@@ -863,6 +869,29 @@ void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item)
}
EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async);
+static void unmap_refs_async_callback(int result,
+ struct gntab_unmap_queue_data *data)
+{
+ struct unmap_refs_async_callback_data* d = data->data;
+
+ d->result = result;
+ complete(&d->completion);
+}
+
+int gnttab_unmap_refs_async_wait_completion(struct gntab_unmap_queue_data* item)
+{
+ struct unmap_refs_async_callback_data data;
+
+ init_completion(&data.completion);
+ item->data = &data;
+ item->done= &unmap_refs_async_callback;
+ gnttab_unmap_refs_async(item);
+ wait_for_completion(&data.completion);
+
+ return data.result;
+}
+EXPORT_SYMBOL_GPL(gnttab_unmap_refs_async_wait_completion);
+
static int gnttab_map_frames_v1(xen_pfn_t *frames, unsigned int nr_gframes)
{
int rc;
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 143ca5f..46bad05 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -191,6 +191,7 @@ int gnttab_unmap_refs(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count);
void gnttab_unmap_refs_async(struct gntab_unmap_queue_data* item);
+int gnttab_unmap_refs_async_wait_completion(struct gntab_unmap_queue_data* item);
/* Perform a batch of grant map/copy operations. Retry every batch slot
--
1.8.3.1
--
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