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 */
nd_label_next_nsindex(int index)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 struct nd_region;
139 struct nd_namespace_pmem;
140 struct nd_namespace_blk;
141 int nd_pmem_namespace_label_update(struct nd_region *nd_region,
142 struct nd_namespace_pmem *nspm, resource_size_t size);
143 int nd_blk_namespace_label_update(struct nd_region *nd_region,
144 struct nd_namespace_blk *nsblk, resource_size_t size);
145 #endif /* __LABEL_H__ */
146