Commit f73314b2 authored by Julien Grall's avatar Julien Grall Committed by David Vrabel

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: default avatarJulien Grall <julien.grall@citrix.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent 9cce2914
...@@ -802,6 +802,28 @@ void gnttab_foreach_grant_in_range(struct page *page, ...@@ -802,6 +802,28 @@ void gnttab_foreach_grant_in_range(struct page *page,
} }
EXPORT_SYMBOL_GPL(gnttab_foreach_grant_in_range); 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, int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops, struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count) struct page **pages, unsigned int count)
......
...@@ -264,6 +264,12 @@ static inline void gnttab_for_one_grant(struct page *page, unsigned int offset, ...@@ -264,6 +264,12 @@ static inline void gnttab_for_one_grant(struct page *page, unsigned int offset,
gnttab_foreach_grant_in_range(page, offset, len, fn, data); gnttab_foreach_grant_in_range(page, offset, len, fn, data);
} }
/* Get @nr_grefs grants from an array of page and call fn for each grant */
void gnttab_foreach_grant(struct page **pages,
unsigned int nr_grefs,
xen_grant_fn_t fn,
void *data);
/* Get the number of grant in a specified region /* Get the number of grant in a specified region
* *
* start: Offset from the beginning of the first page * start: Offset from the beginning of the first page
......
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