drivers/nvdimm/label.h

   1 /*
   2  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13 #ifndef __LABEL_H__
  14 #define __LABEL_H__
  15
  16 #include <linux/ndctl.h>
  17 #include <linux/sizes.h>
  18 #include <linux/uuid.h>
  19 #include <linux/io.h>
  20
  21 enum {
  22         NSINDEX_SIG_LEN = 16,
  23         NSINDEX_ALIGN = 256,
  24         NSINDEX_SEQ_MASK = 0x3,
  25         NSLABEL_UUID_LEN = 16,
  26         NSLABEL_NAME_LEN = 64,
  27         NSLABEL_FLAG_ROLABEL = 0x1,  /* read-only label */
  28         NSLABEL_FLAG_LOCAL = 0x2,    /* DIMM-local namespace */
  29         NSLABEL_FLAG_BTT = 0x4,      /* namespace contains a BTT */
  30         NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
  31         BTT_ALIGN = 4096,            /* all btt structures */
  32         BTTINFO_SIG_LEN = 16,
  33         BTTINFO_UUID_LEN = 16,
  34         BTTINFO_FLAG_ERROR = 0x1,    /* error state (read-only) */
  35         BTTINFO_MAJOR_VERSION = 1,
  36         ND_LABEL_MIN_SIZE = 512 * 129, /* see sizeof_namespace_index() */
  37         ND_LABEL_ID_SIZE = 50,
  38         ND_NSINDEX_INIT = 0x1,
  39 };
  40
  41 static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
  42
  43 /**
  44  * struct nd_namespace_index - label set superblock
  45  * @sig: NAMESPACE_INDEX\0
  46  * @flags: placeholder
  47  * @seq: sequence number for this index
  48  * @myoff: offset of this index in label area
  49  * @mysize: size of this index struct
  50  * @otheroff: offset of other index
  51  * @labeloff: offset of first label slot
  52  * @nslot: total number of label slots
  53  * @major: label area major version
  54  * @minor: label area minor version
  55  * @checksum: fletcher64 of all fields
  56  * @free[0]: bitmap, nlabel bits
  57  *
  58  * The size of free[] is rounded up so the total struct size is a
  59  * multiple of NSINDEX_ALIGN bytes.  Any bits this allocates beyond
  60  * nlabel bits must be zero.
  61  */
  62 struct nd_namespace_index {
  63         u8 sig[NSINDEX_SIG_LEN];
  64         u8 flags[3];
  65         u8 labelsize;
  66         __le32 seq;
  67         __le64 myoff;
  68         __le64 mysize;
  69         __le64 otheroff;
  70         __le64 labeloff;
  71         __le32 nslot;
  72         __le16 major;
  73         __le16 minor;
  74         __le64 checksum;
  75         u8 free[0];
  76 };
  77
  78 /**
  79  * struct nd_namespace_label - namespace superblock
  80  * @uuid: UUID per RFC 4122
  81  * @name: optional name (NULL-terminated)
  82  * @flags: see NSLABEL_FLAG_*
  83  * @nlabel: num labels to describe this ns
  84  * @position: labels position in set
  85  * @isetcookie: interleave set cookie
  86  * @lbasize: LBA size in bytes or 0 for pmem
  87  * @dpa: DPA of NVM range on this DIMM
  88  * @rawsize: size of namespace
  89  * @slot: slot of this label in label area
  90  * @unused: must be zero
  91  */
  92 struct nd_namespace_label {
  93         u8 uuid[NSLABEL_UUID_LEN];
  94         u8 name[NSLABEL_NAME_LEN];
  95         __le32 flags;
  96         __le16 nlabel;
  97         __le16 position;
  98         __le64 isetcookie;
  99         __le64 lbasize;
 100         __le64 dpa;
 101         __le64 rawsize;
 102         __le32 slot;
 103         /*
 104          * Accessing fields past this point should be gated by a
 105          * namespace_label_has() check.
 106          */
 107         u8 align;
 108         u8 reserved[3];
 109         guid_t type_guid;
 110         guid_t abstraction_guid;
 111         u8 reserved2[88];
 112         __le64 checksum;
 113 };
 114
 115 #define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
 116 #define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8"
 117 #define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
 118 #define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
 119
 120 /**
 121  * struct nd_label_id - identifier string for dpa allocation
 122  * @id: "{blk|pmem}-<namespace uuid>"
 123  */
 124 struct nd_label_id {
 125         char id[ND_LABEL_ID_SIZE];
 126 };
 127
 128 /*
 129  * If the 'best' index is invalid, so is the 'next' index.  Otherwise,
 130  * the next index is MOD(index+1, 2)
 131  */
 132 static inline int nd_label_next_nsindex(int index)
 133 {
 134         if (index < 0)
 135                 return -1;
 136
 137         return (index + 1) % 2;
 138 }
 139
 140 struct nvdimm_drvdata;
 141 int nd_label_validate(struct nvdimm_drvdata *ndd);
 142 void nd_label_copy(struct nvdimm_drvdata *ndd, struct nd_namespace_index *dst,
 143                 struct nd_namespace_index *src);
 144 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
 145 int nd_label_active_count(struct nvdimm_drvdata *ndd);
 146 struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
 147 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
 148 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
 149 u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
 150 enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid);
 151 struct nd_region;
 152 struct nd_namespace_pmem;
 153 struct nd_namespace_blk;
 154 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
 155                 struct nd_namespace_pmem *nspm, resource_size_t size);
 156 int nd_blk_namespace_label_update(struct nd_region *nd_region,
 157                 struct nd_namespace_blk *nsblk, resource_size_t size);
 158 #endif /* __LABEL_H__ */