Merge tag 'devdax-for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm...
[muen/linux.git] / tools / testing / nvdimm / dax-dev.c
1 /*
2  * Copyright (c) 2016, Intel Corporation.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  */
13 #include "test/nfit_test.h"
14 #include <linux/mm.h>
15 #include "../../../drivers/dax/dax-private.h"
16
17 phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
18                 unsigned long size)
19 {
20         struct resource *res = &dev_dax->region->res;
21         phys_addr_t addr;
22
23         addr = pgoff * PAGE_SIZE + res->start;
24         if (addr >= res->start && addr <= res->end) {
25                 if (addr + size - 1 <= res->end) {
26                         if (get_nfit_res(addr)) {
27                                 struct page *page;
28
29                                 if (dev_dax->region->align > PAGE_SIZE)
30                                         return -1;
31
32                                 page = vmalloc_to_page((void *)addr);
33                                 return PFN_PHYS(page_to_pfn(page));
34                         } else
35                                 return addr;
36                 }
37         }
38         return -1;
39 }