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f295e53b DW |
1 | /* |
2 | * Copyright (c) 2014-2016, 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/blkdev.h> | |
15 | #include <pmem.h> | |
16 | #include <nd.h> | |
17 | ||
c1d6e828 DW |
18 | long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff, |
19 | long nr_pages, void **kaddr, pfn_t *pfn) | |
f295e53b | 20 | { |
c1d6e828 | 21 | resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset; |
f295e53b | 22 | |
c1d6e828 DW |
23 | if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512, |
24 | PFN_PHYS(nr_pages)))) | |
f295e53b | 25 | return -EIO; |
ee8520fe DW |
26 | |
27 | /* | |
28 | * Limit dax to a single page at a time given vmalloc()-backed | |
29 | * in the nfit_test case. | |
30 | */ | |
31 | if (get_nfit_res(pmem->phys_addr + offset)) { | |
32 | struct page *page; | |
33 | ||
34 | *kaddr = pmem->virt_addr + offset; | |
35 | page = vmalloc_to_page(pmem->virt_addr + offset); | |
36 | *pfn = page_to_pfn_t(page); | |
c1d6e828 DW |
37 | pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n", |
38 | __func__, pmem, pgoff, page_to_pfn(page)); | |
ee8520fe | 39 | |
c1d6e828 | 40 | return 1; |
f295e53b DW |
41 | } |
42 | ||
f295e53b DW |
43 | *kaddr = pmem->virt_addr + offset; |
44 | *pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags); | |
45 | ||
46 | /* | |
47 | * If badblocks are present, limit known good range to the | |
48 | * requested range. | |
49 | */ | |
50 | if (unlikely(pmem->bb.count)) | |
c1d6e828 DW |
51 | return nr_pages; |
52 | return PHYS_PFN(pmem->size - pmem->pfn_pad - offset); | |
f295e53b | 53 | } |