drivers/nvdimm/pfn.h

   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
  24 struct 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         /* minor-version-3 guarantee the padding and flags are zero */
  40         u8 padding[4000];
  41         __le64 checksum;
  42 };
  43
  44 #ifdef CONFIG_SPARSEMEM
  45 #define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
  46 #define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
  47 #else
  48 /*
  49  * In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
  50  * but we still want pmem to compile.
  51  */
  52 #define PFN_SECTION_ALIGN_DOWN(x) (x)
  53 #define PFN_SECTION_ALIGN_UP(x) (x)
  54 #endif
  55
  56 #define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
  57 #define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
  58 #endif /* __NVDIMM_PFN_H */