18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0 28c2ecf20Sopenharmony_ci#include <linux/bio.h> 38c2ecf20Sopenharmony_ci#include <linux/export.h> 48c2ecf20Sopenharmony_ci#include <xen/xen.h> 58c2ecf20Sopenharmony_ci#include <xen/page.h> 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci/* check if @page can be merged with 'vec1' */ 88c2ecf20Sopenharmony_cibool xen_biovec_phys_mergeable(const struct bio_vec *vec1, 98c2ecf20Sopenharmony_ci const struct page *page) 108c2ecf20Sopenharmony_ci{ 118c2ecf20Sopenharmony_ci#if XEN_PAGE_SIZE == PAGE_SIZE 128c2ecf20Sopenharmony_ci unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); 138c2ecf20Sopenharmony_ci unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page)); 148c2ecf20Sopenharmony_ci 158c2ecf20Sopenharmony_ci return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; 168c2ecf20Sopenharmony_ci#else 178c2ecf20Sopenharmony_ci /* 188c2ecf20Sopenharmony_ci * XXX: Add support for merging bio_vec when using different page 198c2ecf20Sopenharmony_ci * size in Xen and Linux. 208c2ecf20Sopenharmony_ci */ 218c2ecf20Sopenharmony_ci return false; 228c2ecf20Sopenharmony_ci#endif 238c2ecf20Sopenharmony_ci} 24