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authorJuergen Gross <jgross@suse.com>2020-12-07 10:31:22 +0300
committerJuergen Gross <jgross@suse.com>2020-12-09 12:31:37 +0300
commitca33479cc7be2c9b5f8be078c8bf3ac26b7d6186 (patch)
tree8877168fff59f8955f29ddaf37a0ac6a0cb3d9fd /include/xen
parenta68a0262abdaa251e12c53715f48e698a18ef402 (diff)
downloadlinux-ca33479cc7be2c9b5f8be078c8bf3ac26b7d6186.tar.xz
xen: add helpers for caching grant mapping pages
Instead of having similar helpers in multiple backend drivers use common helpers for caching pages allocated via gnttab_alloc_pages(). Make use of those helpers in blkback and scsiback. Cc: <stable@vger.kernel.org> # 5.9 Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovksy@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/grant_table.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index 9bc5bc07d4d3..c6ef8ffc1a09 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -198,6 +198,19 @@ void gnttab_free_auto_xlat_frames(void);
int gnttab_alloc_pages(int nr_pages, struct page **pages);
void gnttab_free_pages(int nr_pages, struct page **pages);
+struct gnttab_page_cache {
+ spinlock_t lock;
+ struct list_head pages;
+ unsigned int num_pages;
+};
+
+void gnttab_page_cache_init(struct gnttab_page_cache *cache);
+int gnttab_page_cache_get(struct gnttab_page_cache *cache, struct page **page);
+void gnttab_page_cache_put(struct gnttab_page_cache *cache, struct page **page,
+ unsigned int num);
+void gnttab_page_cache_shrink(struct gnttab_page_cache *cache,
+ unsigned int num);
+
#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
struct gnttab_dma_alloc_args {
/* Device for which DMA memory will be/was allocated. */