[deliverable/linux.git] / drivers / nvdimm / 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,
};

struct nd_poison {
	u64 start;
	u64 length;
	struct list_head list;
};

struct nvdimm_drvdata {
	struct device *dev;
	int nsindex_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 flush_mask;
	void __iomem *flush_wpq[0][0];
};

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);
}

#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_label(l, label, labels) \
	for (l = 0; (label = labels ? labels[l] : NULL); l++)

#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_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 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;
	u8 *uuid;
	int id;
};

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_sector_size_show(unsigned long current_lbasize,
		const unsigned long *supported, char *buf);
ssize_t nd_sector_size_store(struct device *dev, const char *buf,
		unsigned long *current_lbasize, const unsigned long *supported);
int __init nvdimm_init(void);
int __init nd_region_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_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);
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)
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);
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);
void nvdimm_badblocks_populate(struct nd_region *nd_region,
		struct badblocks *bb, const struct resource *res);
#if IS_ENABLED(CONFIG_ND_CLAIM)
struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
		struct resource *res, struct vmem_altmap *altmap);
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 struct vmem_altmap *nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
		struct resource *res, struct vmem_altmap *altmap)
{
	return ERR_PTR(-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_bdev->bd_disk;

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

	__nd_iostat_start(bio, start);
	return true;
}
void nd_iostat_end(struct bio *bio, unsigned long 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__ */
Commit	Line	Data
	1	/*
	2	* Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of version 2 of the GNU General Public License as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*/
	13	#ifndef __ND_H__
	14	#define __ND_H__
	15	#include <linux/libnvdimm.h>
	16	#include <linux/badblocks.h>
	17	#include <linux/blkdev.h>
	18	#include <linux/device.h>
	19	#include <linux/mutex.h>
	20	#include <linux/ndctl.h>
	21	#include <linux/types.h>
	22	#include <linux/nd.h>
	23	#include "label.h"
	24
	25	enum {
	26	/*
	27	* Limits the maximum number of block apertures a dimm can
	28	* support and is an input to the geometry/on-disk-format of a
	29	* BTT instance
	30	*/
	31	ND_MAX_LANES = 256,
	32	SECTOR_SHIFT = 9,
	33	INT_LBASIZE_ALIGNMENT = 64,
	34	};
	35
	36	struct nd_poison {
	37	u64 start;
	38	u64 length;
	39	struct list_head list;
	40	};
	41
	42	struct nvdimm_drvdata {
	43	struct device *dev;
	44	int nsindex_size;
	45	struct nd_cmd_get_config_size nsarea;
	46	void *data;
	47	int ns_current, ns_next;
	48	struct resource dpa;
	49	struct kref kref;
	50	};
	51
	52	struct nd_region_data {
	53	int ns_count;
	54	int ns_active;
	55	unsigned int flush_mask;
	56	void __iomem *flush_wpq[0][0];
	57	};
	58
	59	static inline struct nd_namespace_index *to_namespace_index(
	60	struct nvdimm_drvdata *ndd, int i)
	61	{
	62	if (i < 0)
	63	return NULL;
	64
	65	return ndd->data + sizeof_namespace_index(ndd) * i;
	66	}
	67
	68	static inline struct nd_namespace_index *to_current_namespace_index(
	69	struct nvdimm_drvdata *ndd)
	70	{
	71	return to_namespace_index(ndd, ndd->ns_current);
	72	}
	73
	74	static inline struct nd_namespace_index *to_next_namespace_index(
	75	struct nvdimm_drvdata *ndd)
	76	{
	77	return to_namespace_index(ndd, ndd->ns_next);
	78	}
	79
	80	#define nd_dbg_dpa(r, d, res, fmt, arg...) \
	81	dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
	82	(r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
	83	(unsigned long long) (res ? resource_size(res) : 0), \
	84	(unsigned long long) (res ? res->start : 0), ##arg)
	85
	86	#define for_each_label(l, label, labels) \
	87	for (l = 0; (label = labels ? labels[l] : NULL); l++)
	88
	89	#define for_each_dpa_resource(ndd, res) \
	90	for (res = (ndd)->dpa.child; res; res = res->sibling)
	91
	92	#define for_each_dpa_resource_safe(ndd, res, next) \
	93	for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
	94	res; res = next, next = next ? next->sibling : NULL)
	95
	96	struct nd_percpu_lane {
	97	int count;
	98	spinlock_t lock;
	99	};
	100
	101	struct nd_region {
	102	struct device dev;
	103	struct ida ns_ida;
	104	struct ida btt_ida;
	105	struct ida pfn_ida;
	106	struct ida dax_ida;
	107	unsigned long flags;
	108	struct device *ns_seed;
	109	struct device *btt_seed;
	110	struct device *pfn_seed;
	111	struct device *dax_seed;
	112	u16 ndr_mappings;
	113	u64 ndr_size;
	114	u64 ndr_start;
	115	int id, num_lanes, ro, numa_node;
	116	void *provider_data;
	117	struct nd_interleave_set *nd_set;
	118	struct nd_percpu_lane __percpu *lane;
	119	struct nd_mapping mapping[0];
	120	};
	121
	122	struct nd_blk_region {
	123	int (enable)(struct nvdimm_bus nvdimm_bus, struct device *dev);
	124	int (do_io)(struct nd_blk_region ndbr, resource_size_t dpa,
	125	void *iobuf, u64 len, int rw);
	126	void *blk_provider_data;
	127	struct nd_region nd_region;
	128	};
	129
	130	/*
	131	* Lookup next in the repeating sequence of 01, 10, and 11.
	132	*/
	133	static inline unsigned nd_inc_seq(unsigned seq)
	134	{
	135	static const unsigned next[] = { 0, 2, 3, 1 };
	136
	137	return next[seq & 3];
	138	}
	139
	140	struct btt;
	141	struct nd_btt {
	142	struct device dev;
	143	struct nd_namespace_common *ndns;
	144	struct btt *btt;
	145	unsigned long lbasize;
	146	u8 *uuid;
	147	int id;
	148	};
	149
	150	enum nd_pfn_mode {
	151	PFN_MODE_NONE,
	152	PFN_MODE_RAM,
	153	PFN_MODE_PMEM,
	154	};
	155
	156	struct nd_pfn {
	157	int id;
	158	u8 *uuid;
	159	struct device dev;
	160	unsigned long align;
	161	unsigned long npfns;
	162	enum nd_pfn_mode mode;
	163	struct nd_pfn_sb *pfn_sb;
	164	struct nd_namespace_common *ndns;
	165	};
	166
	167	struct nd_dax {
	168	struct nd_pfn nd_pfn;
	169	};
	170
	171	enum nd_async_mode {
	172	ND_SYNC,
	173	ND_ASYNC,
	174	};
	175
	176	int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
	177	void wait_nvdimm_bus_probe_idle(struct device *dev);
	178	void nd_device_register(struct device *dev);
	179	void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
	180	void nd_device_notify(struct device *dev, enum nvdimm_event event);
	181	int nd_uuid_store(struct device dev, u8 uuid_out, const char buf,
	182	size_t len);
	183	ssize_t nd_sector_size_show(unsigned long current_lbasize,
	184	const unsigned long supported, char buf);
	185	ssize_t nd_sector_size_store(struct device dev, const char buf,
	186	unsigned long current_lbasize, const unsigned long supported);
	187	int __init nvdimm_init(void);
	188	int __init nd_region_init(void);
	189	void nvdimm_exit(void);
	190	void nd_region_exit(void);
	191	struct nvdimm;
	192	struct nvdimm_drvdata to_ndd(struct nd_mapping nd_mapping);
	193	int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
	194	int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
	195	int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
	196	void *buf, size_t len);
	197	long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
	198	unsigned int len);
	199	struct nd_btt to_nd_btt(struct device dev);
	200
	201	struct nd_gen_sb {
	202	char reserved[SZ_4K - 8];
	203	__le64 checksum;
	204	};
	205
	206	u64 nd_sb_checksum(struct nd_gen_sb *sb);
	207	#if IS_ENABLED(CONFIG_BTT)
	208	int nd_btt_probe(struct device dev, struct nd_namespace_common ndns);
	209	bool is_nd_btt(struct device *dev);
	210	struct device nd_btt_create(struct nd_region nd_region);
	211	#else
	212	static inline int nd_btt_probe(struct device *dev,
	213	struct nd_namespace_common *ndns)
	214	{
	215	return -ENODEV;
	216	}
	217
	218	static inline bool is_nd_btt(struct device *dev)
	219	{
	220	return false;
	221	}
	222
	223	static inline struct device nd_btt_create(struct nd_region nd_region)
	224	{
	225	return NULL;
	226	}
	227	#endif
	228
	229	struct nd_pfn to_nd_pfn(struct device dev);
	230	#if IS_ENABLED(CONFIG_NVDIMM_PFN)
	231	int nd_pfn_probe(struct device dev, struct nd_namespace_common ndns);
	232	bool is_nd_pfn(struct device *dev);
	233	struct device nd_pfn_create(struct nd_region nd_region);
	234	struct device nd_pfn_devinit(struct nd_pfn nd_pfn,
	235	struct nd_namespace_common *ndns);
	236	int nd_pfn_validate(struct nd_pfn nd_pfn, const char sig);
	237	extern struct attribute_group nd_pfn_attribute_group;
	238	#else
	239	static inline int nd_pfn_probe(struct device *dev,
	240	struct nd_namespace_common *ndns)
	241	{
	242	return -ENODEV;
	243	}
	244
	245	static inline bool is_nd_pfn(struct device *dev)
	246	{
	247	return false;
	248	}
	249
	250	static inline struct device nd_pfn_create(struct nd_region nd_region)
	251	{
	252	return NULL;
	253	}
	254
	255	static inline int nd_pfn_validate(struct nd_pfn nd_pfn, const char sig)
	256	{
	257	return -ENODEV;
	258	}
	259	#endif
	260
	261	struct nd_dax to_nd_dax(struct device dev);
	262	#if IS_ENABLED(CONFIG_NVDIMM_DAX)
	263	int nd_dax_probe(struct device dev, struct nd_namespace_common ndns);
	264	bool is_nd_dax(struct device *dev);
	265	struct device nd_dax_create(struct nd_region nd_region);
	266	#else
	267	static inline int nd_dax_probe(struct device *dev,
	268	struct nd_namespace_common *ndns)
	269	{
	270	return -ENODEV;
	271	}
	272
	273	static inline bool is_nd_dax(struct device *dev)
	274	{
	275	return false;
	276	}
	277
	278	static inline struct device nd_dax_create(struct nd_region nd_region)
	279	{
	280	return NULL;
	281	}
	282	#endif
	283
	284	struct nd_region to_nd_region(struct device dev);
	285	int nd_region_to_nstype(struct nd_region *nd_region);
	286	int nd_region_register_namespaces(struct nd_region nd_region, int err);
	287	u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
	288	void nvdimm_bus_lock(struct device *dev);
	289	void nvdimm_bus_unlock(struct device *dev);
	290	bool is_nvdimm_bus_locked(struct device *dev);
	291	int nvdimm_revalidate_disk(struct gendisk *disk);
	292	void nvdimm_drvdata_release(struct kref *kref);
	293	void put_ndd(struct nvdimm_drvdata *ndd);
	294	int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
	295	void nvdimm_free_dpa(struct nvdimm_drvdata ndd, struct resource res);
	296	struct resource nvdimm_allocate_dpa(struct nvdimm_drvdata ndd,
	297	struct nd_label_id *label_id, resource_size_t start,
	298	resource_size_t n);
	299	resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
	300	struct nd_namespace_common nvdimm_namespace_common_probe(struct device dev);
	301	int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
	302	int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
	303	const char nvdimm_namespace_disk_name(struct nd_namespace_common ndns,
	304	char *name);
	305	void nvdimm_badblocks_populate(struct nd_region *nd_region,
	306	struct badblocks bb, const struct resource res);
	307	#if IS_ENABLED(CONFIG_ND_CLAIM)
	308	struct vmem_altmap nvdimm_setup_pfn(struct nd_pfn nd_pfn,
	309	struct resource res, struct vmem_altmap altmap);
	310	int devm_nsio_enable(struct device dev, struct nd_namespace_io nsio);
	311	void devm_nsio_disable(struct device dev, struct nd_namespace_io nsio);
	312	#else
	313	static inline struct vmem_altmap nvdimm_setup_pfn(struct nd_pfn nd_pfn,
	314	struct resource res, struct vmem_altmap altmap)
	315	{
	316	return ERR_PTR(-ENXIO);
	317	}
	318	static inline int devm_nsio_enable(struct device *dev,
	319	struct nd_namespace_io *nsio)
	320	{
	321	return -ENXIO;
	322	}
	323	static inline void devm_nsio_disable(struct device *dev,
	324	struct nd_namespace_io *nsio)
	325	{
	326	}
	327	#endif
	328	int nd_blk_region_init(struct nd_region *nd_region);
	329	int nd_region_activate(struct nd_region *nd_region);
	330	void __nd_iostat_start(struct bio bio, unsigned long start);
	331	static inline bool nd_iostat_start(struct bio bio, unsigned long start)
	332	{
	333	struct gendisk *disk = bio->bi_bdev->bd_disk;
	334
	335	if (!blk_queue_io_stat(disk->queue))
	336	return false;
	337
	338	__nd_iostat_start(bio, start);
	339	return true;
	340	}
	341	void nd_iostat_end(struct bio *bio, unsigned long start);
	342	static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
	343	unsigned int len)
	344	{
	345	if (bb->count) {
	346	sector_t first_bad;
	347	int num_bad;
	348
	349	return !!badblocks_check(bb, sector, len / 512, &first_bad,
	350	&num_bad);
	351	}
	352
	353	return false;
	354	}
	355	resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
	356	const u8 nd_dev_to_uuid(struct device dev);
	357	bool pmem_should_map_pages(struct device *dev);
	358	#endif /* __ND_H__ */