LXR linux/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
  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