| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 1 | #include <linux/bio.h> |
| 2 | #include <linux/io.h> |
| Stephen Rothwell | 9ef9b20 | 2012-01-19 10:24:31 +1100 | [diff] [blame] | 3 | #include <linux/export.h> |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 4 | #include <xen/page.h> |
| 5 | |
| 6 | bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, |
| 7 | const struct bio_vec *vec2) |
| 8 | { |
| Julien Grall | 36f8abd | 2015-05-11 13:44:21 +0100 | [diff] [blame] | 9 | #if XEN_PAGE_SIZE == PAGE_SIZE |
| Julien Grall | 32e0987 | 2015-08-07 17:34:35 +0100 | [diff] [blame] | 10 | unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page)); |
| 11 | unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page)); |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 12 | |
| 13 | return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) && |
| Julien Grall | 32e0987 | 2015-08-07 17:34:35 +0100 | [diff] [blame] | 14 | ((bfn1 == bfn2) || ((bfn1+1) == bfn2)); |
| Julien Grall | 36f8abd | 2015-05-11 13:44:21 +0100 | [diff] [blame] | 15 | #else |
| 16 | /* |
| 17 | * XXX: Add support for merging bio_vec when using different page |
| 18 | * size in Xen and Linux. |
| 19 | */ |
| 20 | return 0; |
| 21 | #endif |
| Jeremy Fitzhardinge | d8e0420 | 2009-02-09 12:05:46 -0800 | [diff] [blame] | 22 | } |
| Matthew Wilcox | 0b934cc | 2011-11-04 15:41:27 -0400 | [diff] [blame] | 23 | EXPORT_SYMBOL(xen_biovec_phys_mergeable); |