drivers/nvdimm/label.h - linux - Git at Google

 /* 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 = 0x3,
 	NSLABEL_UUID_LEN = 16,
 	NSLABEL_NAME_LEN = 64,
 	NSLABEL_FLAG_ROLABEL = 0x1,  /* read-only label */
 	NSLABEL_FLAG_LOCAL = 0x2,    /* DIMM-local namespace */
 	NSLABEL_FLAG_BTT = 0x4,      /* namespace contains a BTT */
 	NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
 	BTT_ALIGN = 4096,            /* all btt structures */
 	BTTINFO_SIG_LEN = 16,
 	BTTINFO_UUID_LEN = 16,
 	BTTINFO_FLAG_ERROR = 0x1,    /* 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 = 0x1,
 };

 /**
  * 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[0xac];
 	__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[0x56];
 	__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__ */
	/* 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 = 0x3,
	NSLABEL_UUID_LEN = 16,
	NSLABEL_NAME_LEN = 64,
	NSLABEL_FLAG_ROLABEL = 0x1, /* read-only label */
	NSLABEL_FLAG_LOCAL = 0x2, /* DIMM-local namespace */
	NSLABEL_FLAG_BTT = 0x4, /* namespace contains a BTT */
	NSLABEL_FLAG_UPDATING = 0x8, /* label being updated */
	BTT_ALIGN = 4096, /* all btt structures */
	BTTINFO_SIG_LEN = 16,
	BTTINFO_UUID_LEN = 16,
	BTTINFO_FLAG_ERROR = 0x1, /* 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 = 0x1,
	};

	/**
	* 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[0xac];
	__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[0x56];
	__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__ */