| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/bio.h> |
| 3 | #include <linux/io.h> |
| 4 | #include <linux/export.h> |
| 5 | #include <xen/page.h> |
| 6 | |
| 7 | bool 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 | EXPORT_SYMBOL(xen_biovec_phys_mergeable); |