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xen/grant-table: Make set/clear page private code shared

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Make set/clear page private code shared and accessible to
other kernel modules which can re-use these instead of open-coding.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Oleksandr Andrushchenko 2018-07-20 12:01:43 +03:00 committed by Boris Ostrovsky
parent d72e90f33a
commit 8c3799ee25
2 changed files with 38 additions and 19 deletions
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54
drivers/xen/grant-table.c
View File

@ -769,29 +769,18 @@ 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 gnttab_pages_set_private(int nr_pages, struct page **pages)
{
int i;
int ret;
ret = alloc_xenballooned_pages(nr_pages, pages);
if (ret < 0)
return ret;
for (i = 0; i < nr_pages; i++) {
#if BITS_PER_LONG < 64
struct xen_page_foreign *foreign;
foreign = kzalloc(sizeof(*foreign), GFP_KERNEL);
if (!foreign) {
gnttab_free_pages(nr_pages, pages);
if (!foreign)
return -ENOMEM;
}
set_page_private(pages[i], (unsigned long)foreign);
#endif
SetPagePrivate(pages[i]);
@ -799,14 +788,30 @@ int gnttab_alloc_pages(int nr_pages, struct page **pages)
return 0;
}
EXPORT_SYMBOL_GPL(gnttab_alloc_pages);
EXPORT_SYMBOL_GPL(gnttab_pages_set_private);
/**
* gnttab_free_pages - free pages allocated by gnttab_alloc_pages()
* @nr_pages; number of pages to free
* @pages: the pages
* gnttab_alloc_pages - alloc pages suitable for grant mapping into
* @nr_pages: number of pages to alloc
* @pages: returns the pages
*/
void gnttab_free_pages(int nr_pages, struct page **pages)
int gnttab_alloc_pages(int nr_pages, struct page **pages)
{
int ret;
ret = alloc_xenballooned_pages(nr_pages, pages);
if (ret < 0)
return ret;
ret = gnttab_pages_set_private(nr_pages, pages);
if (ret < 0)
gnttab_free_pages(nr_pages, pages);
return ret;
}
EXPORT_SYMBOL_GPL(gnttab_alloc_pages);
void gnttab_pages_clear_private(int nr_pages, struct page **pages)
{
int i;
@ -818,6 +823,17 @@ void gnttab_free_pages(int nr_pages, struct page **pages)
ClearPagePrivate(pages[i]);
}
}
}
EXPORT_SYMBOL_GPL(gnttab_pages_clear_private);
/**
* 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)
{
gnttab_pages_clear_private(nr_pages, pages);
free_xenballooned_pages(nr_pages, pages);
}
EXPORT_SYMBOL_GPL(gnttab_free_pages);

3
include/xen/grant_table.h
View File

@ -198,6 +198,9 @@ 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);
int gnttab_pages_set_private(int nr_pages, struct page **pages);
void gnttab_pages_clear_private(int nr_pages, struct page **pages);
int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);