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| author | David Vrabel <david.vrabel@citrix.com> | 2015-01-08 19:06:01 +0100 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-01-28 15:03:12 +0100 |
| commit | ff4b156f166b3931894d2a8b5cdba6cdf4da0618 (patch) | |
| tree | dfb7d79d269b365b2a95efa390c0fe62a8de935e /drivers/xen/grant-table.c | |
| parent | x86/xen: require ballooned pages for grant maps (diff) | |
| download | linux-ff4b156f166b3931894d2a8b5cdba6cdf4da0618.tar.xz linux-ff4b156f166b3931894d2a8b5cdba6cdf4da0618.zip | |
xen/grant-table: add helpers for allocating pages
Add gnttab_alloc_pages() and gnttab_free_pages() to allocate/free pages
suitable to for granted maps.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'drivers/xen/grant-table.c')
| -rw-r--r-- | drivers/xen/grant-table.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 999d7abdbcec..b4f93c490f83 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -50,6 +50,7 @@ #include <xen/interface/memory.h> #include <xen/hvc-console.h> #include <xen/swiotlb-xen.h> +#include <xen/balloon.h> #include <asm/xen/hypercall.h> #include <asm/xen/interface.h> @@ -671,6 +672,34 @@ void gnttab_free_auto_xlat_frames(void) } EXPORT_SYMBOL_GPL(gnttab_free_auto_xlat_frames); +/** + * gnttab_alloc_pages - alloc pages suitable for grant mapping into + * @nr_pages: number of pages to alloc + * @pages: returns the pages + */ +int gnttab_alloc_pages(int nr_pages, struct page **pages) +{ + int ret; + + ret = alloc_xenballooned_pages(nr_pages, pages, false); + if (ret < 0) + return ret; + + return 0; +} +EXPORT_SYMBOL(gnttab_alloc_pages); + +/** + * gnttab_free_pages - free pages allocated by gnttab_alloc_pages() + * @nr_pages; number of pages to free + * @pages: the pages + */ +void gnttab_free_pages(int nr_pages, struct page **pages) +{ + free_xenballooned_pages(nr_pages, pages); +} +EXPORT_SYMBOL(gnttab_free_pages); + /* Handling of paged out grant targets (GNTST_eagain) */ #define MAX_DELAY 256 static inline void |