drivers/nvdimm/pfn.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2014-2015, Intel Corporation.
   4  */
   5
   6 #ifndef __NVDIMM_PFN_H
   7 #define __NVDIMM_PFN_H
   8
   9 #include <linux/types.h>
  10 #include <linux/mmzone.h>
  11
  12 #define PFN_SIG_LEN 16
  13 #define PFN_SIG "NVDIMM_PFN_INFO\0"
  14 #define DAX_SIG "NVDIMM_DAX_INFO\0"
  15
  16 struct nd_pfn_sb {
  17         u8 signature[PFN_SIG_LEN];
  18         u8 uuid[16];
  19         u8 parent_uuid[16];
  20         __le32 flags;
  21         __le16 version_major;
  22         __le16 version_minor;
  23         __le64 dataoff; /* relative to namespace_base + start_pad */
  24         __le64 npfns;
  25         __le32 mode;
  26         /* minor-version-1 additions for section alignment */
  27         __le32 start_pad;
  28         __le32 end_trunc;
  29         /* minor-version-2 record the base alignment of the mapping */
  30         __le32 align;
  31         /* minor-version-3 guarantee the padding and flags are zero */
  32         u8 padding[4000];
  33         __le64 checksum;
  34 };
  35
  36 #ifdef CONFIG_SPARSEMEM
  37 #define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
  38 #define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
  39 #else
  40 /*
  41  * In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
  42  * but we still want pmem to compile.
  43  */
  44 #define PFN_SECTION_ALIGN_DOWN(x) (x)
  45 #define PFN_SECTION_ALIGN_UP(x) (x)
  46 #endif
  47
  48 #define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
  49 #define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
  50 #endif /* __NVDIMM_PFN_H */