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xen/grant-table: Add an helper to iterate over a specific number of grants

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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 <[email protected]>
Signed-off-by: David Vrabel <[email protected]>
This commit is contained in:
Julien Grall 2015-10-13 17:50:12 +01:00 • committed by David Vrabel
commit f73314b281
2 changed files with 28 additions and 0 deletions
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22
drivers/xen/grant-table.c
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@ -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)