1// SPDX-License-Identifier: GPL-2.0
2#include <linux/bio.h>
3#include <linux/export.h>
4#include <xen/xen.h>
5#include <xen/page.h>
6
7bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
8 const struct bio_vec *vec2)
9{
10#if XEN_PAGE_SIZE == PAGE_SIZE
11 unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
12 unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
13
14 return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
15#else
16 /*
17 * XXX: Add support for merging bio_vec when using different page
18 * size in Xen and Linux.
19 */
20 return false;
21#endif
22}
23