/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright ( c ) 2013 - 2015 Intel Corporation . All rights reserved .
*/
#ifndef __LABEL_H__
#define __LABEL_H__
#include <linux/ndctl.h>
#include <linux/sizes.h>
#include <linux/uuid.h>
#include <linux/io.h>
enum {
NSINDEX_SIG_LEN = 16 ,
NSINDEX_ALIGN = 256 ,
NSINDEX_SEQ_MASK = 0 x3,
NSLABEL_UUID_LEN = 16 ,
NSLABEL_NAME_LEN = 64 ,
NSLABEL_FLAG_ROLABEL = 0 x1, /* read-only label */
NSLABEL_FLAG_LOCAL = 0 x2, /* DIMM-local namespace */
NSLABEL_FLAG_BTT = 0 x4, /* namespace contains a BTT */
NSLABEL_FLAG_UPDATING = 0 x8, /* label being updated */
BTT_ALIGN = 4096 , /* all btt structures */
BTTINFO_SIG_LEN = 16 ,
BTTINFO_UUID_LEN = 16 ,
BTTINFO_FLAG_ERROR = 0 x1, /* error state (read-only) */
BTTINFO_MAJOR_VERSION = 1 ,
ND_LABEL_MIN_SIZE = 256 * 4 , /* see sizeof_namespace_index() */
ND_LABEL_ID_SIZE = 50 ,
ND_NSINDEX_INIT = 0 x1,
};
/**
* struct nd_namespace_index - label set superblock
* @ sig : NAMESPACE_INDEX \ 0
* @ flags : placeholder
* @ labelsize : log2 size ( v1 labels 128 bytes v2 labels 256 bytes )
* @ seq : sequence number for this index
* @ myoff : offset of this index in label area
* @ mysize : size of this index struct
* @ otheroff : offset of other index
* @ labeloff : offset of first label slot
* @ nslot : total number of label slots
* @ major : label area major version
* @ minor : label area minor version
* @ checksum : fletcher64 of all fields
* @ free : bitmap , nlabel bits
*
* The size of free [ ] is rounded up so the total struct size is a
* multiple of NSINDEX_ALIGN bytes . Any bits this allocates beyond
* nlabel bits must be zero .
*/
struct nd_namespace_index {
u8 sig[NSINDEX_SIG_LEN];
u8 flags[3 ];
u8 labelsize;
__le32 seq;
__le64 myoff;
__le64 mysize;
__le64 otheroff;
__le64 labeloff;
__le32 nslot;
__le16 major;
__le16 minor;
__le64 checksum;
u8 free[];
};
/**
* struct cxl_region_label - CXL 2 . 0 Table 211
* @ type : uuid identifying this label format ( region )
* @ uuid : uuid for the region this label describes
* @ flags : NSLABEL_FLAG_UPDATING ( all other flags reserved )
* @ nlabel : 1 per interleave - way in the region
* @ position : this label ' s position in the set
* @ dpa : start address in device - local capacity for this label
* @ rawsize : size of this label ' s contribution to region
* @ hpa : mandatory system physical address to map this region
* @ slot : slot id of this label in label area
* @ ig : interleave granularity ( 1 < < @ ig ) * 256 bytes
* @ align : alignment in SZ_256M blocks
* @ reserved : reserved
* @ checksum : fletcher64 sum of this label
*/
struct cxl_region_label {
u8 type[NSLABEL_UUID_LEN];
u8 uuid[NSLABEL_UUID_LEN];
__le32 flags;
__le16 nlabel;
__le16 position;
__le64 dpa;
__le64 rawsize;
__le64 hpa;
__le32 slot;
__le32 ig;
__le32 align;
u8 reserved[0 xac];
__le64 checksum;
};
/**
* struct nvdimm_efi_label - namespace superblock
* @ uuid : UUID per RFC 4122
* @ name : optional name ( NULL - terminated )
* @ flags : see NSLABEL_FLAG_ *
* @ nlabel : num labels to describe this ns
* @ position : labels position in set
* @ isetcookie : interleave set cookie
* @ lbasize : LBA size in bytes or 0 for pmem
* @ dpa : DPA of NVM range on this DIMM
* @ rawsize : size of namespace
* @ slot : slot of this label in label area
* @ align : physical address alignment of the namespace
* @ reserved : reserved
* @ type_guid : copy of struct acpi_nfit_system_address . range_guid
* @ abstraction_guid : personality id ( btt , btt2 , fsdax , devdax . . . . )
* @ reserved2 : reserved
* @ checksum : fletcher64 sum of this object
*/
struct nvdimm_efi_label {
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
__le16 nlabel;
__le16 position;
__le64 isetcookie;
__le64 lbasize;
__le64 dpa;
__le64 rawsize;
__le32 slot;
/*
* Accessing fields past this point should be gated by a
* efi_namespace_label_has ( ) check .
*/
u8 align;
u8 reserved[3 ];
guid_t type_guid;
guid_t abstraction_guid;
u8 reserved2[88 ];
__le64 checksum;
};
/**
* struct nvdimm_cxl_label - CXL 2 . 0 Table 212
* @ type : uuid identifying this label format ( namespace )
* @ uuid : uuid for the namespace this label describes
* @ name : friendly name for the namespace
* @ flags : NSLABEL_FLAG_UPDATING ( all other flags reserved )
* @ nrange : discontiguous namespace support
* @ position : this label ' s position in the set
* @ dpa : start address in device - local capacity for this label
* @ rawsize : size of this label ' s contribution to namespace
* @ slot : slot id of this label in label area
* @ align : alignment in SZ_256M blocks
* @ region_uuid : host interleave set identifier
* @ abstraction_uuid : personality driver for this namespace
* @ lbasize : address geometry for disk - like personalities
* @ reserved : reserved
* @ checksum : fletcher64 sum of this label
*/
struct nvdimm_cxl_label {
u8 type[NSLABEL_UUID_LEN];
u8 uuid[NSLABEL_UUID_LEN];
u8 name[NSLABEL_NAME_LEN];
__le32 flags;
__le16 nrange;
__le16 position;
__le64 dpa;
__le64 rawsize;
__le32 slot;
__le32 align;
u8 region_uuid[16 ];
u8 abstraction_uuid[16 ];
__le16 lbasize;
u8 reserved[0 x56];
__le64 checksum;
};
struct nd_namespace_label {
union {
struct nvdimm_cxl_label cxl;
struct nvdimm_efi_label efi;
};
};
#define NVDIMM_BTT_GUID "8aed63a2-29a2-4c66-8b12-f05d15d3922a"
#define NVDIMM_BTT2_GUID "18633bfc-1735-4217-8ac9-17239282d3f8"
#define NVDIMM_PFN_GUID "266400ba-fb9f-4677-bcb0-968f11d0d225"
#define NVDIMM_DAX_GUID "97a86d9c-3cdd-4eda-986f-5068b4f80088"
#define CXL_REGION_UUID "529d7c61-da07-47c4-a93f-ecdf2c06f444"
#define CXL_NAMESPACE_UUID "68bb2c0a-5a77-4937-9f85-3caf41a0f93c"
/**
* struct nd_label_id - identifier string for dpa allocation
* @ id : " pmem - < namespace uuid > "
*/
struct nd_label_id {
char id[ND_LABEL_ID_SIZE];
};
/*
* If the ' best ' index is invalid , so is the ' next ' index . Otherwise ,
* the next index is MOD ( index + 1 , 2 )
*/
static inline int nd_label_next_nsindex(int index)
{
if (index < 0 )
return -1 ;
return (index + 1 ) % 2 ;
}
struct nvdimm_drvdata;
int nd_label_data_init(struct nvdimm_drvdata *ndd);
size_t sizeof_namespace_index(struct nvdimm_drvdata *ndd);
int nd_label_active_count(struct nvdimm_drvdata *ndd);
struct nd_namespace_label *nd_label_active(struct nvdimm_drvdata *ndd, int n);
u32 nd_label_alloc_slot(struct nvdimm_drvdata *ndd);
bool nd_label_free_slot(struct nvdimm_drvdata *ndd, u32 slot);
u32 nd_label_nfree(struct nvdimm_drvdata *ndd);
struct nd_region;
struct nd_namespace_pmem;
int nd_pmem_namespace_label_update(struct nd_region *nd_region,
struct nd_namespace_pmem *nspm, resource_size_t size);
#endif /* __LABEL_H__ */
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(vorverarbeitet am 2026-09-29)
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