1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. 4 */ 5 #ifndef __LABEL_H__ 6 #define __LABEL_H__ 7 8 #include <linux/ndctl.h> 9 #include <linux/sizes.h> 10 #include <linux/uuid.h> 11 #include <linux/io.h> 12 13 enum { 14 NSINDEX_SIG_LEN = 16, 15 NSINDEX_ALIGN = 256, 16 NSINDEX_SEQ_MASK = 0x3, 17 NSLABEL_UUID_LEN = 16, 18 NSLABEL_NAME_LEN = 64, 19 NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */ 20 NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */ 21 NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */ 22 NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */ 23 BTT_ALIGN = 4096, /* all btt structures */ 24 BTTINFO_SIG_LEN = 16, 25 BTTINFO_UUID_LEN = 16, 26 BTTINFO_FLAG_ERROR = 0x1, /* error state (read-only) */ 27 BTTINFO_MAJOR_VERSION = 1, 28 ND_LABEL_MIN_SIZE = 256 * 4, /* see sizeof_namespace_index() */ 29 ND_LABEL_ID_SIZE = 50, 30 ND_NSINDEX_INIT = 0x1, 31 }; 32 33 /** 34 * struct nd_namespace_index - label set superblock 35 * @sig: NAMESPACE_INDEX\0 36 * @flags: placeholder 37 * @seq: sequence number for this index 38 * @myoff: offset of this index in label area 39 * @mysize: size of this index struct 40 * @otheroff: offset of other index 41 * @labeloff: offset of first label slot 42 * @nslot: total number of label slots 43 * @major: label area major version 44 * @minor: label area minor version 45 * @checksum: fletcher64 of all fields 46 * @free[0]: bitmap, nlabel bits 47 * 48 * The size of free[] is rounded up so the total struct size is a 49 * multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond 50 * nlabel bits must be zero. 51 */ 52 struct nd_namespace_index { 53 u8 sig[NSINDEX_SIG_LEN]; 54 u8 flags[3]; 55 u8 labelsize; 56 __le32 seq; 57 __le64 myoff; 58 __le64 mysize; 59 __le64 otheroff; 60 __le64 labeloff; 61 __le32 nslot; 62 __le16 major; 63 __le16 minor; 64 __le64 checksum; 65 u8 free[]; 66 }; 67 68 /** 69 * struct nd_namespace_label - namespace superblock 70 * @uuid: UUID per RFC 4122 71 * @name: optional name (NULL-terminated) 72 * @flags: see NSLABEL_FLAG_* 73 * @nlabel: num labels to describe this ns 74 * @position: labels position in set 75 * @isetcookie: interleave set cookie 76 * @lbasize: LBA size in bytes or 0 for pmem 77 * @dpa: DPA of NVM range on this DIMM 78 * @rawsize: size of namespace 79 * @slot: slot of this label in label area 80 * @unused: must be zero 81 */ 82 struct nd_namespace_label { 83 u8 uuid[NSLABEL_UUID_LEN]; 84 u8 name[NSLABEL_NAME_LEN]; 85 __le32 flags; 86 __le16 nlabel; 87 __le16 position; 88 __le64 isetcookie; 89 __le64 lbasize; 90 __le64 dpa; 91 __le64 rawsize; 92 __le32 slot; 93 /* 94 * Accessing fields past this point should be gated by a 95 * namespace_label_has() check. 96 */ 97 u8 align; 98 u8 reserved[3]; 99 guid_t type_guid; 100 guid_t abstraction_guid; 101 u8 reserved2[88]; 102 __le64 checksum; 103 }; 104 105 #define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a" 106 #define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8" 107 #define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225" 108 #define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088" 109 110 /** 111 * struct nd_label_id - identifier string for dpa allocation 112 * @id: "{blk|pmem}-<namespace uuid>" 113 */ 114 struct nd_label_id { 115 char id[ND_LABEL_ID_SIZE]; 116 }; 117 118 /* 119 * If the 'best' index is invalid, so is the 'next' index. Otherwise, 120 * the next index is MOD(index+1, 2) 121 */ 122 static inline int nd_label_next_nsindex(int index) 123 { 124 if (index < 0) 125 return -1; 126 127 return (index + 1) % 2; 128 } 129 130 struct nvdimm_drvdata; 131 int nd_label_data_init(struct nvdimm_drvdata *ndd); 132 size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd); 133 int nd_label_active_count(struct nvdimm_drvdata *ndd); 134 struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n); 135 u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd); 136 bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot); 137 u32 nd_label_nfree(struct nvdimm_drvdata *ndd); 138 enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid); 139 struct nd_region; 140 struct nd_namespace_pmem; 141 struct nd_namespace_blk; 142 int nd_pmem_namespace_label_update(struct nd_region *nd_region, 143 struct nd_namespace_pmem *nspm, resource_size_t size); 144 int nd_blk_namespace_label_update(struct nd_region *nd_region, 145 struct nd_namespace_blk *nsblk, resource_size_t size); 146 #endif /* __LABEL_H__ */ 147