1/*
2 * Copyright (c) 2014-2015, 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
14#ifndef __NVDIMM_PFN_H
15#define __NVDIMM_PFN_H
16
17#include <linux/types.h>
18#include <linux/mmzone.h>
19
20#define PFN_SIG_LEN 16
21#define PFN_SIG "NVDIMM_PFN_INFO\0"
22#define DAX_SIG "NVDIMM_DAX_INFO\0"
23
24struct nd_pfn_sb {
25 u8 signature[PFN_SIG_LEN];
26 u8 uuid[16];
27 u8 parent_uuid[16];
28 __le32 flags;
29 __le16 version_major;
30 __le16 version_minor;
31 __le64 dataoff; /* relative to namespace_base + start_pad */
32 __le64 npfns;
33 __le32 mode;
34 /* minor-version-1 additions for section alignment */
35 __le32 start_pad;
36 __le32 end_trunc;
37 /* minor-version-2 record the base alignment of the mapping */
38 __le32 align;
39 u8 padding[4000];
40 __le64 checksum;
41};
42
43#ifdef CONFIG_SPARSEMEM
44#define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
45#define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
46#else
47/*
48 * In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
49 * but we still want pmem to compile.
50 */
51#define PFN_SECTION_ALIGN_DOWN(x) (x)
52#define PFN_SECTION_ALIGN_UP(x) (x)
53#endif
54
55#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
56#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
57#endif /* __NVDIMM_PFN_H */
58