| Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 2 | #include <linux/bio.h> |
| Stephen Rothwell | 9ef9b20 | 2012-01-19 10:24:31 +1100 | [diff] [blame] | 3 | #include <linux/export.h> |
| Christoph Hellwig | c39ae60 | 2018-09-25 13:30:08 -0700 | [diff] [blame] | 4 | #include <xen/xen.h> |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 5 | #include <xen/page.h> |
| 6 | |
| Ming Lei | 0383ad4 | 2019-03-29 15:07:54 +0800 | [diff] [blame] | 7 | /* check if @page can be merged with 'vec1' */ |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 8 | bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, |
| Ming Lei | 0383ad4 | 2019-03-29 15:07:54 +0800 | [diff] [blame] | 9 | const struct page *page) |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 10 | { |
| Julien Grall | 36f8abd | 2015-05-11 13:44:21 +0100 | [diff] [blame] | 11 | #if XEN_PAGE_SIZE == PAGE_SIZE |
| Julien Grall | 32e0987 | 2015-08-07 17:34:35 +0100 | [diff] [blame] | 12 | unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); |
| Ming Lei | 0383ad4 | 2019-03-29 15:07:54 +0800 | [diff] [blame] | 13 | unsigned long bfn2 = pfn_to_bfn(page_to_pfn(page)); |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 14 | |
| Roger Pau Monne | 462cdac | 2017-07-18 15:01:00 +0100 | [diff] [blame] | 15 | return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2; |
| Julien Grall | 36f8abd | 2015-05-11 13:44:21 +0100 | [diff] [blame] | 16 | #else |
| 17 | /* |
| 18 | * XXX: Add support for merging bio_vec when using different page |
| 19 | * size in Xen and Linux. |
| 20 | */ |
| Gustavo A. R. Silva | bf06bad | 2018-08-04 19:50:14 -0500 | [diff] [blame] | 21 | return false; |
| Julien Grall | 36f8abd | 2015-05-11 13:44:21 +0100 | [diff] [blame] | 22 | #endif |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 23 | } |