From f73314b28148f9ee9f89a0ae961c8fb36e3269fa Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Tue, 13 Oct 2015 17:50:12 +0100 Subject: xen/grant-table: Add an helper to iterate over a specific number of grants With the 64KB page granularity support on ARM64, a Linux page may be split accross multiple grant. Currently we have the helper gnttab_foreach_grant_in_grant to break a Linux page based on an offset and a len, but it doesn't fit when we only have a number of grants in hand. Introduce a new helper which take an array of Linux page and a number of grant and will figure out the address of each grant. Signed-off-by: Julien Grall Signed-off-by: David Vrabel --- drivers/xen/grant-table.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/xen') diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 72d633962095..c49f79ed58c5 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -802,6 +802,28 @@ void gnttab_foreach_grant_in_range(struct page *page, } EXPORT_SYMBOL_GPL(gnttab_foreach_grant_in_range); +void gnttab_foreach_grant(struct page **pages, + unsigned int nr_grefs, + xen_grant_fn_t fn, + void *data) +{ + unsigned int goffset = 0; + unsigned long xen_pfn = 0; + unsigned int i; + + for (i = 0; i < nr_grefs; i++) { + if ((i % XEN_PFN_PER_PAGE) == 0) { + xen_pfn = page_to_xen_pfn(pages[i / XEN_PFN_PER_PAGE]); + goffset = 0; + } + + fn(pfn_to_gfn(xen_pfn), goffset, XEN_PAGE_SIZE, data); + + goffset += XEN_PAGE_SIZE; + xen_pfn++; + } +} + int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops, struct gnttab_map_grant_ref *kmap_ops, struct page **pages, unsigned int count) -- cgit v1.2.3-59-g8ed1b