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

 /*
  * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  */
 #ifndef __ND_H__
 #define __ND_H__
 #include <linux/libnvdimm.h>
 #include <linux/badblocks.h>
 #include <linux/blkdev.h>
 #include <linux/device.h>
 #include <linux/mutex.h>
 #include <linux/ndctl.h>
 #include <linux/types.h>
 #include <linux/nd.h>
 #include "label.h"

 enum {
 	/*
 	 * Limits the maximum number of block apertures a dimm can
 	 * support and is an input to the geometry/on-disk-format of a
 	 * BTT instance
 	 */
 	ND_MAX_LANES = 256,
 	SECTOR_SHIFT = 9,
 	INT_LBASIZE_ALIGNMENT = 64,
 	NVDIMM_IO_ATOMIC = 1,
 };

 struct nvdimm_drvdata {
 	struct device *dev;
 	int nslabel_size;
 	struct nd_cmd_get_config_size nsarea;
 	void *data;
 	int ns_current, ns_next;
 	struct resource dpa;
 	struct kref kref;
 };

 struct nd_region_data {
 	int ns_count;
 	int ns_active;
 	unsigned int hints_shift;
 	void __iomem *flush_wpq[0];
 };

 static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
 		int dimm, int hint)
 {
 	unsigned int num = 1 << ndrd->hints_shift;
 	unsigned int mask = num - 1;

 	return ndrd->flush_wpq[dimm * num + (hint & mask)];
 }

 static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
 		int hint, void __iomem *flush)
 {
 	unsigned int num = 1 << ndrd->hints_shift;
 	unsigned int mask = num - 1;

 	ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
 }

 static inline struct nd_namespace_index *to_namespace_index(
 		struct nvdimm_drvdata *ndd, int i)
 {
 	if (i < 0)
 		return NULL;

 	return ndd->data + sizeof_namespace_index(ndd) * i;
 }

 static inline struct nd_namespace_index *to_current_namespace_index(
 		struct nvdimm_drvdata *ndd)
 {
 	return to_namespace_index(ndd, ndd->ns_current);
 }

 static inline struct nd_namespace_index *to_next_namespace_index(
 		struct nvdimm_drvdata *ndd)
 {
 	return to_namespace_index(ndd, ndd->ns_next);
 }

 unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);

 #define namespace_label_has(ndd, field) \
 	(offsetof(struct nd_namespace_label, field) \
 		< sizeof_namespace_label(ndd))

 #define nd_dbg_dpa(r, d, res, fmt, arg...) \
 	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
 		(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
 		(unsigned long long) (res ? resource_size(res) : 0), \
 		(unsigned long long) (res ? res->start : 0), ##arg)

 #define for_each_dpa_resource(ndd, res) \
 	for (res = (ndd)->dpa.child; res; res = res->sibling)

 #define for_each_dpa_resource_safe(ndd, res, next) \
 	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
 			res; res = next, next = next ? next->sibling : NULL)

 struct nd_percpu_lane {
 	int count;
 	spinlock_t lock;
 };

 struct nd_label_ent {
 	struct list_head list;
 	struct nd_namespace_label *label;
 };

 enum nd_mapping_lock_class {
 	ND_MAPPING_CLASS0,
 	ND_MAPPING_UUID_SCAN,
 };

 struct nd_mapping {
 	struct nvdimm *nvdimm;
 	u64 start;
 	u64 size;
 	int position;
 	struct list_head labels;
 	struct mutex lock;
 	/*
 	 * @ndd is for private use at region enable / disable time for
 	 * get_ndd() + put_ndd(), all other nd_mapping to ndd
 	 * conversions use to_ndd() which respects enabled state of the
 	 * nvdimm.
 	 */
 	struct nvdimm_drvdata *ndd;
 };

 struct nd_region {
 	struct device dev;
 	struct ida ns_ida;
 	struct ida btt_ida;
 	struct ida pfn_ida;
 	struct ida dax_ida;
 	unsigned long flags;
 	struct device *ns_seed;
 	struct device *btt_seed;
 	struct device *pfn_seed;
 	struct device *dax_seed;
 	u16 ndr_mappings;
 	u64 ndr_size;
 	u64 ndr_start;
 	int id, num_lanes, ro, numa_node;
 	void *provider_data;
 	struct kernfs_node *bb_state;
 	struct badblocks bb;
 	struct nd_interleave_set *nd_set;
 	struct nd_percpu_lane __percpu *lane;
 	struct nd_mapping mapping[0];
 };

 struct nd_blk_region {
 	int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
 	int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
 			void *iobuf, u64 len, int rw);
 	void *blk_provider_data;
 	struct nd_region nd_region;
 };

 /*
  * Lookup next in the repeating sequence of 01, 10, and 11.
  */
 static inline unsigned nd_inc_seq(unsigned seq)
 {
 	static const unsigned next[] = { 0, 2, 3, 1 };

 	return next[seq & 3];
 }

 struct btt;
 struct nd_btt {
 	struct device dev;
 	struct nd_namespace_common *ndns;
 	struct btt *btt;
 	unsigned long lbasize;
 	u64 size;
 	u8 *uuid;
 	int id;
 	int initial_offset;
 	u16 version_major;
 	u16 version_minor;
 };

 enum nd_pfn_mode {
 	PFN_MODE_NONE,
 	PFN_MODE_RAM,
 	PFN_MODE_PMEM,
 };

 struct nd_pfn {
 	int id;
 	u8 *uuid;
 	struct device dev;
 	unsigned long align;
 	unsigned long npfns;
 	enum nd_pfn_mode mode;
 	struct nd_pfn_sb *pfn_sb;
 	struct nd_namespace_common *ndns;
 };

 struct nd_dax {
 	struct nd_pfn nd_pfn;
 };

 enum nd_async_mode {
 	ND_SYNC,
 	ND_ASYNC,
 };

 int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
 void wait_nvdimm_bus_probe_idle(struct device *dev);
 void nd_device_register(struct device *dev);
 void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
 void nd_device_notify(struct device *dev, enum nvdimm_event event);
 int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
 		size_t len);
 ssize_t nd_size_select_show(unsigned long current_size,
 		const unsigned long *supported, char *buf);
 ssize_t nd_size_select_store(struct device *dev, const char *buf,
 		unsigned long *current_size, const unsigned long *supported);
 int __init nvdimm_init(void);
 int __init nd_region_init(void);
 int __init nd_label_init(void);
 void nvdimm_exit(void);
 void nd_region_exit(void);
 struct nvdimm;
 struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
 int nvdimm_check_config_data(struct device *dev);
 int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
 int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
 int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
 		void *buf, size_t len);
 long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 		unsigned int len);
 void nvdimm_set_aliasing(struct device *dev);
 void nvdimm_set_locked(struct device *dev);
 void nvdimm_clear_locked(struct device *dev);
 struct nd_btt *to_nd_btt(struct device *dev);

 struct nd_gen_sb {
 	char reserved[SZ_4K - 8];
 	__le64 checksum;
 };

 u64 nd_sb_checksum(struct nd_gen_sb *sb);
 #if IS_ENABLED(CONFIG_BTT)
 int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
 bool is_nd_btt(struct device *dev);
 struct device *nd_btt_create(struct nd_region *nd_region);
 #else
 static inline int nd_btt_probe(struct device *dev,
 		struct nd_namespace_common *ndns)
 {
 	return -ENODEV;
 }

 static inline bool is_nd_btt(struct device *dev)
 {
 	return false;
 }

 static inline struct device *nd_btt_create(struct nd_region *nd_region)
 {
 	return NULL;
 }
 #endif

 struct nd_pfn *to_nd_pfn(struct device *dev);
 #if IS_ENABLED(CONFIG_NVDIMM_PFN)

 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 #define PFN_DEFAULT_ALIGNMENT HPAGE_PMD_SIZE
 #else
 #define PFN_DEFAULT_ALIGNMENT PAGE_SIZE
 #endif

 int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
 bool is_nd_pfn(struct device *dev);
 struct device *nd_pfn_create(struct nd_region *nd_region);
 struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
 		struct nd_namespace_common *ndns);
 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
 extern struct attribute_group nd_pfn_attribute_group;
 #else
 static inline int nd_pfn_probe(struct device *dev,
 		struct nd_namespace_common *ndns)
 {
 	return -ENODEV;
 }

 static inline bool is_nd_pfn(struct device *dev)
 {
 	return false;
 }

 static inline struct device *nd_pfn_create(struct nd_region *nd_region)
 {
 	return NULL;
 }

 static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 {
 	return -ENODEV;
 }
 #endif

 struct nd_dax *to_nd_dax(struct device *dev);
 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
 bool is_nd_dax(struct device *dev);
 struct device *nd_dax_create(struct nd_region *nd_region);
 #else
 static inline int nd_dax_probe(struct device *dev,
 		struct nd_namespace_common *ndns)
 {
 	return -ENODEV;
 }

 static inline bool is_nd_dax(struct device *dev)
 {
 	return false;
 }

 static inline struct device *nd_dax_create(struct nd_region *nd_region)
 {
 	return NULL;
 }
 #endif

 struct nd_region *to_nd_region(struct device *dev);
 int nd_region_to_nstype(struct nd_region *nd_region);
 int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
 u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
 		struct nd_namespace_index *nsindex);
 u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
 void nvdimm_bus_lock(struct device *dev);
 void nvdimm_bus_unlock(struct device *dev);
 bool is_nvdimm_bus_locked(struct device *dev);
 int nvdimm_revalidate_disk(struct gendisk *disk);
 void nvdimm_drvdata_release(struct kref *kref);
 void put_ndd(struct nvdimm_drvdata *ndd);
 int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
 void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
 struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
 		struct nd_label_id *label_id, resource_size_t start,
 		resource_size_t n);
 resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
 struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
 int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
 int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
 const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
 		char *name);
 unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
 void nvdimm_badblocks_populate(struct nd_region *nd_region,
 		struct badblocks *bb, const struct resource *res);
 #if IS_ENABLED(CONFIG_ND_CLAIM)
 int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
 int devm_nsio_enable(struct device *dev, struct nd_namespace_io *nsio);
 void devm_nsio_disable(struct device *dev, struct nd_namespace_io *nsio);
 #else
 static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
 				   struct dev_pagemap *pgmap)
 {
 	return -ENXIO;
 }
 static inline int devm_nsio_enable(struct device *dev,
 		struct nd_namespace_io *nsio)
 {
 	return -ENXIO;
 }
 static inline void devm_nsio_disable(struct device *dev,
 		struct nd_namespace_io *nsio)
 {
 }
 #endif
 int nd_blk_region_init(struct nd_region *nd_region);
 int nd_region_activate(struct nd_region *nd_region);
 void __nd_iostat_start(struct bio *bio, unsigned long *start);
 static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
 {
 	struct gendisk *disk = bio->bi_disk;

 	if (!blk_queue_io_stat(disk->queue))
 		return false;

 	*start = jiffies;
 	generic_start_io_acct(disk->queue, bio_data_dir(bio),
 			      bio_sectors(bio), &disk->part0);
 	return true;
 }
 static inline void nd_iostat_end(struct bio *bio, unsigned long start)
 {
 	struct gendisk *disk = bio->bi_disk;

 	generic_end_io_acct(disk->queue, bio_data_dir(bio), &disk->part0,
 				start);
 }
 static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
 		unsigned int len)
 {
 	if (bb->count) {
 		sector_t first_bad;
 		int num_bad;

 		return !!badblocks_check(bb, sector, len / 512, &first_bad,
 				&num_bad);
 	}

 	return false;
 }
 resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
 const u8 *nd_dev_to_uuid(struct device *dev);
 bool pmem_should_map_pages(struct device *dev);
 #endif /* __ND_H__ */
	/*
	* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*/
	#ifndef __ND_H__
	#define __ND_H__
	#include <linux/libnvdimm.h>
	#include <linux/badblocks.h>
	#include <linux/blkdev.h>
	#include <linux/device.h>
	#include <linux/mutex.h>
	#include <linux/ndctl.h>
	#include <linux/types.h>
	#include <linux/nd.h>
	#include "label.h"

	enum {
	/*
	* Limits the maximum number of block apertures a dimm can
	* support and is an input to the geometry/on-disk-format of a
	* BTT instance
	*/
	ND_MAX_LANES = 256,
	SECTOR_SHIFT = 9,
	INT_LBASIZE_ALIGNMENT = 64,
	NVDIMM_IO_ATOMIC = 1,
	};

	struct nvdimm_drvdata {
	struct device *dev;
	int nslabel_size;
	struct nd_cmd_get_config_size nsarea;
	void *data;
	int ns_current, ns_next;
	struct resource dpa;
	struct kref kref;
	};

	struct nd_region_data {
	int ns_count;
	int ns_active;
	unsigned int hints_shift;
	void __iomem *flush_wpq[0];
	};

	static inline void __iomem ndrd_get_flush_wpq(struct nd_region_data ndrd,
	int dimm, int hint)
	{
	unsigned int num = 1 << ndrd->hints_shift;
	unsigned int mask = num - 1;

	return ndrd->flush_wpq[dimm * num + (hint & mask)];
	}

	static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
	int hint, void __iomem *flush)
	{
	unsigned int num = 1 << ndrd->hints_shift;
	unsigned int mask = num - 1;

	ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
	}

	static inline struct nd_namespace_index *to_namespace_index(
	struct nvdimm_drvdata *ndd, int i)
	{
	if (i < 0)
	return NULL;

	return ndd->data + sizeof_namespace_index(ndd) * i;
	}

	static inline struct nd_namespace_index *to_current_namespace_index(
	struct nvdimm_drvdata *ndd)
	{
	return to_namespace_index(ndd, ndd->ns_current);
	}

	static inline struct nd_namespace_index *to_next_namespace_index(
	struct nvdimm_drvdata *ndd)
	{
	return to_namespace_index(ndd, ndd->ns_next);
	}

	unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);

	#define namespace_label_has(ndd, field) \
	(offsetof(struct nd_namespace_label, field) \
	< sizeof_namespace_label(ndd))

	#define nd_dbg_dpa(r, d, res, fmt, arg...) \
	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
	(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
	(unsigned long long) (res ? resource_size(res) : 0), \
	(unsigned long long) (res ? res->start : 0), ##arg)

	#define for_each_dpa_resource(ndd, res) \
	for (res = (ndd)->dpa.child; res; res = res->sibling)

	#define for_each_dpa_resource_safe(ndd, res, next) \
	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
	res; res = next, next = next ? next->sibling : NULL)

	struct nd_percpu_lane {
	int count;
	spinlock_t lock;
	};

	struct nd_label_ent {
	struct list_head list;
	struct nd_namespace_label *label;
	};

	enum nd_mapping_lock_class {
	ND_MAPPING_CLASS0,
	ND_MAPPING_UUID_SCAN,
	};

	struct nd_mapping {
	struct nvdimm *nvdimm;
	u64 start;
	u64 size;
	int position;
	struct list_head labels;
	struct mutex lock;
	/*
	* @ndd is for private use at region enable / disable time for
	* get_ndd() + put_ndd(), all other nd_mapping to ndd
	* conversions use to_ndd() which respects enabled state of the
	* nvdimm.
	*/
	struct nvdimm_drvdata *ndd;
	};

	struct nd_region {
	struct device dev;
	struct ida ns_ida;
	struct ida btt_ida;
	struct ida pfn_ida;
	struct ida dax_ida;
	unsigned long flags;
	struct device *ns_seed;
	struct device *btt_seed;
	struct device *pfn_seed;
	struct device *dax_seed;
	u16 ndr_mappings;
	u64 ndr_size;
	u64 ndr_start;
	int id, num_lanes, ro, numa_node;
	void *provider_data;
	struct kernfs_node *bb_state;
	struct badblocks bb;
	struct nd_interleave_set *nd_set;
	struct nd_percpu_lane __percpu *lane;
	struct nd_mapping mapping[0];
	};

	struct nd_blk_region {
	int (enable)(struct nvdimm_bus nvdimm_bus, struct device *dev);
	int (do_io)(struct nd_blk_region ndbr, resource_size_t dpa,
	void *iobuf, u64 len, int rw);
	void *blk_provider_data;
	struct nd_region nd_region;
	};

	/*
	* Lookup next in the repeating sequence of 01, 10, and 11.
	*/
	static inline unsigned nd_inc_seq(unsigned seq)
	{
	static const unsigned next[] = { 0, 2, 3, 1 };

	return next[seq & 3];
	}

	struct btt;
	struct nd_btt {
	struct device dev;
	struct nd_namespace_common *ndns;
	struct btt *btt;
	unsigned long lbasize;
	u64 size;
	u8 *uuid;
	int id;
	int initial_offset;
	u16 version_major;
	u16 version_minor;
	};

	enum nd_pfn_mode {
	PFN_MODE_NONE,
	PFN_MODE_RAM,
	PFN_MODE_PMEM,
	};

	struct nd_pfn {
	int id;
	u8 *uuid;
	struct device dev;
	unsigned long align;
	unsigned long npfns;
	enum nd_pfn_mode mode;
	struct nd_pfn_sb *pfn_sb;
	struct nd_namespace_common *ndns;
	};

	struct nd_dax {
	struct nd_pfn nd_pfn;
	};

	enum nd_async_mode {
	ND_SYNC,
	ND_ASYNC,
	};

	int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
	void wait_nvdimm_bus_probe_idle(struct device *dev);
	void nd_device_register(struct device *dev);
	void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
	void nd_device_notify(struct device *dev, enum nvdimm_event event);
	int nd_uuid_store(struct device dev, u8 uuid_out, const char buf,
	size_t len);
	ssize_t nd_size_select_show(unsigned long current_size,
	const unsigned long supported, char buf);
	ssize_t nd_size_select_store(struct device dev, const char buf,
	unsigned long current_size, const unsigned long supported);
	int __init nvdimm_init(void);
	int __init nd_region_init(void);
	int __init nd_label_init(void);
	void nvdimm_exit(void);
	void nd_region_exit(void);
	struct nvdimm;
	struct nvdimm_drvdata to_ndd(struct nd_mapping nd_mapping);
	int nvdimm_check_config_data(struct device *dev);
	int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
	int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
	int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
	void *buf, size_t len);
	long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
	unsigned int len);
	void nvdimm_set_aliasing(struct device *dev);
	void nvdimm_set_locked(struct device *dev);
	void nvdimm_clear_locked(struct device *dev);
	struct nd_btt to_nd_btt(struct device dev);

	struct nd_gen_sb {
	char reserved[SZ_4K - 8];
	__le64 checksum;
	};

	u64 nd_sb_checksum(struct nd_gen_sb *sb);
	#if IS_ENABLED(CONFIG_BTT)
	int nd_btt_probe(struct device dev, struct nd_namespace_common ndns);
	bool is_nd_btt(struct device *dev);
	struct device nd_btt_create(struct nd_region nd_region);
	#else
	static inline int nd_btt_probe(struct device *dev,
	struct nd_namespace_common *ndns)
	{
	return -ENODEV;
	}

	static inline bool is_nd_btt(struct device *dev)
	{
	return false;
	}

	static inline struct device nd_btt_create(struct nd_region nd_region)
	{
	return NULL;
	}
	#endif

	struct nd_pfn to_nd_pfn(struct device dev);
	#if IS_ENABLED(CONFIG_NVDIMM_PFN)

	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	#define PFN_DEFAULT_ALIGNMENT HPAGE_PMD_SIZE
	#else
	#define PFN_DEFAULT_ALIGNMENT PAGE_SIZE
	#endif

	int nd_pfn_probe(struct device dev, struct nd_namespace_common ndns);
	bool is_nd_pfn(struct device *dev);
	struct device nd_pfn_create(struct nd_region nd_region);
	struct device nd_pfn_devinit(struct nd_pfn nd_pfn,
	struct nd_namespace_common *ndns);
	int nd_pfn_validate(struct nd_pfn nd_pfn, const char sig);
	extern struct attribute_group nd_pfn_attribute_group;
	#else
	static inline int nd_pfn_probe(struct device *dev,
	struct nd_namespace_common *ndns)
	{
	return -ENODEV;
	}

	static inline bool is_nd_pfn(struct device *dev)
	{
	return false;
	}

	static inline struct device nd_pfn_create(struct nd_region nd_region)
	{
	return NULL;
	}

	static inline int nd_pfn_validate(struct nd_pfn nd_pfn, const char sig)
	{
	return -ENODEV;
	}
	#endif

	struct nd_dax to_nd_dax(struct device dev);
	#if IS_ENABLED(CONFIG_NVDIMM_DAX)
	int nd_dax_probe(struct device dev, struct nd_namespace_common ndns);
	bool is_nd_dax(struct device *dev);
	struct device nd_dax_create(struct nd_region nd_region);
	#else
	static inline int nd_dax_probe(struct device *dev,
	struct nd_namespace_common *ndns)
	{
	return -ENODEV;
	}

	static inline bool is_nd_dax(struct device *dev)
	{
	return false;
	}

	static inline struct device nd_dax_create(struct nd_region nd_region)
	{
	return NULL;
	}
	#endif

	struct nd_region to_nd_region(struct device dev);
	int nd_region_to_nstype(struct nd_region *nd_region);
	int nd_region_register_namespaces(struct nd_region nd_region, int err);
	u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
	struct nd_namespace_index *nsindex);
	u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
	void nvdimm_bus_lock(struct device *dev);
	void nvdimm_bus_unlock(struct device *dev);
	bool is_nvdimm_bus_locked(struct device *dev);
	int nvdimm_revalidate_disk(struct gendisk *disk);
	void nvdimm_drvdata_release(struct kref *kref);
	void put_ndd(struct nvdimm_drvdata *ndd);
	int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
	void nvdimm_free_dpa(struct nvdimm_drvdata ndd, struct resource res);
	struct resource nvdimm_allocate_dpa(struct nvdimm_drvdata ndd,
	struct nd_label_id *label_id, resource_size_t start,
	resource_size_t n);
	resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
	struct nd_namespace_common nvdimm_namespace_common_probe(struct device dev);
	int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
	int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
	const char nvdimm_namespace_disk_name(struct nd_namespace_common ndns,
	char *name);
	unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
	void nvdimm_badblocks_populate(struct nd_region *nd_region,
	struct badblocks bb, const struct resource res);
	#if IS_ENABLED(CONFIG_ND_CLAIM)
	int nvdimm_setup_pfn(struct nd_pfn nd_pfn, struct dev_pagemap pgmap);
	int devm_nsio_enable(struct device dev, struct nd_namespace_io nsio);
	void devm_nsio_disable(struct device dev, struct nd_namespace_io nsio);
	#else
	static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
	struct dev_pagemap *pgmap)
	{
	return -ENXIO;
	}
	static inline int devm_nsio_enable(struct device *dev,
	struct nd_namespace_io *nsio)
	{
	return -ENXIO;
	}
	static inline void devm_nsio_disable(struct device *dev,
	struct nd_namespace_io *nsio)
	{
	}
	#endif
	int nd_blk_region_init(struct nd_region *nd_region);
	int nd_region_activate(struct nd_region *nd_region);
	void __nd_iostat_start(struct bio bio, unsigned long start);
	static inline bool nd_iostat_start(struct bio bio, unsigned long start)
	{
	struct gendisk *disk = bio->bi_disk;

	if (!blk_queue_io_stat(disk->queue))
	return false;

	*start = jiffies;
	generic_start_io_acct(disk->queue, bio_data_dir(bio),
	bio_sectors(bio), &disk->part0);
	return true;
	}
	static inline void nd_iostat_end(struct bio *bio, unsigned long start)
	{
	struct gendisk *disk = bio->bi_disk;

	generic_end_io_acct(disk->queue, bio_data_dir(bio), &disk->part0,
	start);
	}
	static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
	unsigned int len)
	{
	if (bb->count) {
	sector_t first_bad;
	int num_bad;

	return !!badblocks_check(bb, sector, len / 512, &first_bad,
	&num_bad);
	}

	return false;
	}
	resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
	const u8 nd_dev_to_uuid(struct device dev);
	bool pmem_should_map_pages(struct device *dev);
	#endif /* __ND_H__ */