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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
4 */
5#ifndef __ND_H__
6#define __ND_H__
7#include <linux/libnvdimm.h>
8#include <linux/badblocks.h>
9#include <linux/blkdev.h>
10#include <linux/device.h>
11#include <linux/mutex.h>
12#include <linux/ndctl.h>
13#include <linux/types.h>
14#include <linux/nd.h>
15#include "label.h"
16
17enum {
18 /*
19 * Limits the maximum number of block apertures a dimm can
20 * support and is an input to the geometry/on-disk-format of a
21 * BTT instance
22 */
23 ND_MAX_LANES = 256,
24 INT_LBASIZE_ALIGNMENT = 64,
25 NVDIMM_IO_ATOMIC = 1,
26};
27
28struct nvdimm_drvdata {
29 struct device *dev;
30 int nslabel_size;
31 struct nd_cmd_get_config_size nsarea;
32 void *data;
33 int ns_current, ns_next;
34 struct resource dpa;
35 struct kref kref;
36};
37
38struct nd_region_data {
39 int ns_count;
40 int ns_active;
41 unsigned int hints_shift;
42 void __iomem *flush_wpq[];
43};
44
45static inline void __iomem *ndrd_get_flush_wpq(struct nd_region_data *ndrd,
46 int dimm, int hint)
47{
48 unsigned int num = 1 << ndrd->hints_shift;
49 unsigned int mask = num - 1;
50
51 return ndrd->flush_wpq[dimm * num + (hint & mask)];
52}
53
54static inline void ndrd_set_flush_wpq(struct nd_region_data *ndrd, int dimm,
55 int hint, void __iomem *flush)
56{
57 unsigned int num = 1 << ndrd->hints_shift;
58 unsigned int mask = num - 1;
59
60 ndrd->flush_wpq[dimm * num + (hint & mask)] = flush;
61}
62
63static inline struct nd_namespace_index *to_namespace_index(
64 struct nvdimm_drvdata *ndd, int i)
65{
66 if (i < 0)
67 return NULL;
68
69 return ndd->data + sizeof_namespace_index(ndd) * i;
70}
71
72static inline struct nd_namespace_index *to_current_namespace_index(
73 struct nvdimm_drvdata *ndd)
74{
75 return to_namespace_index(ndd, ndd->ns_current);
76}
77
78static inline struct nd_namespace_index *to_next_namespace_index(
79 struct nvdimm_drvdata *ndd)
80{
81 return to_namespace_index(ndd, ndd->ns_next);
82}
83
84unsigned sizeof_namespace_label(struct nvdimm_drvdata *ndd);
85
86#define namespace_label_has(ndd, field) \
87 (offsetof(struct nd_namespace_label, field) \
88 < sizeof_namespace_label(ndd))
89
90#define nd_dbg_dpa(r, d, res, fmt, arg...) \
91 dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
92 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
93 (unsigned long long) (res ? resource_size(res) : 0), \
94 (unsigned long long) (res ? res->start : 0), ##arg)
95
96#define for_each_dpa_resource(ndd, res) \
97 for (res = (ndd)->dpa.child; res; res = res->sibling)
98
99#define for_each_dpa_resource_safe(ndd, res, next) \
100 for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
101 res; res = next, next = next ? next->sibling : NULL)
102
103struct nd_percpu_lane {
104 int count;
105 spinlock_t lock;
106};
107
108enum nd_label_flags {
109 ND_LABEL_REAP,
110};
111struct nd_label_ent {
112 struct list_head list;
113 unsigned long flags;
114 struct nd_namespace_label *label;
115};
116
117enum nd_mapping_lock_class {
118 ND_MAPPING_CLASS0,
119 ND_MAPPING_UUID_SCAN,
120};
121
122struct nd_mapping {
123 struct nvdimm *nvdimm;
124 u64 start;
125 u64 size;
126 int position;
127 struct list_head labels;
128 struct mutex lock;
129 /*
130 * @ndd is for private use at region enable / disable time for
131 * get_ndd() + put_ndd(), all other nd_mapping to ndd
132 * conversions use to_ndd() which respects enabled state of the
133 * nvdimm.
134 */
135 struct nvdimm_drvdata *ndd;
136};
137
138struct nd_region {
139 struct device dev;
140 struct ida ns_ida;
141 struct ida btt_ida;
142 struct ida pfn_ida;
143 struct ida dax_ida;
144 unsigned long flags;
145 struct device *ns_seed;
146 struct device *btt_seed;
147 struct device *pfn_seed;
148 struct device *dax_seed;
149 unsigned long align;
150 u16 ndr_mappings;
151 u64 ndr_size;
152 u64 ndr_start;
153 int id, num_lanes, ro, numa_node, target_node;
154 void *provider_data;
155 struct kernfs_node *bb_state;
156 struct badblocks bb;
157 struct nd_interleave_set *nd_set;
158 struct nd_percpu_lane __percpu *lane;
159 int (*flush)(struct nd_region *nd_region, struct bio *bio);
160 struct nd_mapping mapping[];
161};
162
163struct nd_blk_region {
164 int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
165 int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
166 void *iobuf, u64 len, int rw);
167 void *blk_provider_data;
168 struct nd_region nd_region;
169};
170
171/*
172 * Lookup next in the repeating sequence of 01, 10, and 11.
173 */
174static inline unsigned nd_inc_seq(unsigned seq)
175{
176 static const unsigned next[] = { 0, 2, 3, 1 };
177
178 return next[seq & 3];
179}
180
181struct btt;
182struct nd_btt {
183 struct device dev;
184 struct nd_namespace_common *ndns;
185 struct btt *btt;
186 unsigned long lbasize;
187 u64 size;
188 u8 *uuid;
189 int id;
190 int initial_offset;
191 u16 version_major;
192 u16 version_minor;
193};
194
195enum nd_pfn_mode {
196 PFN_MODE_NONE,
197 PFN_MODE_RAM,
198 PFN_MODE_PMEM,
199};
200
201struct nd_pfn {
202 int id;
203 u8 *uuid;
204 struct device dev;
205 unsigned long align;
206 unsigned long npfns;
207 enum nd_pfn_mode mode;
208 struct nd_pfn_sb *pfn_sb;
209 struct nd_namespace_common *ndns;
210};
211
212struct nd_dax {
213 struct nd_pfn nd_pfn;
214};
215
216static inline u32 nd_info_block_reserve(void)
217{
218 return ALIGN(SZ_8K, PAGE_SIZE);
219}
220
221enum nd_async_mode {
222 ND_SYNC,
223 ND_ASYNC,
224};
225
226int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
227void wait_nvdimm_bus_probe_idle(struct device *dev);
228void nd_device_register(struct device *dev);
229void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
230void nd_device_notify(struct device *dev, enum nvdimm_event event);
231int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
232 size_t len);
233ssize_t nd_size_select_show(unsigned long current_size,
234 const unsigned long *supported, char *buf);
235ssize_t nd_size_select_store(struct device *dev, const char *buf,
236 unsigned long *current_size, const unsigned long *supported);
237int __init nvdimm_init(void);
238int __init nd_region_init(void);
239int __init nd_label_init(void);
240void nvdimm_exit(void);
241void nd_region_exit(void);
242struct nvdimm;
243extern const struct attribute_group nd_device_attribute_group;
244extern const struct attribute_group nd_numa_attribute_group;
245extern const struct attribute_group *nvdimm_bus_attribute_groups[];
246struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
247int nvdimm_check_config_data(struct device *dev);
248int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
249int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
250int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
251 size_t offset, size_t len);
252int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
253 void *buf, size_t len);
254long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
255 unsigned int len);
256void nvdimm_set_labeling(struct device *dev);
257void nvdimm_set_locked(struct device *dev);
258void nvdimm_clear_locked(struct device *dev);
259int nvdimm_security_setup_events(struct device *dev);
260#if IS_ENABLED(CONFIG_NVDIMM_KEYS)
261int nvdimm_security_unlock(struct device *dev);
262#else
263static inline int nvdimm_security_unlock(struct device *dev)
264{
265 return 0;
266}
267#endif
268struct nd_btt *to_nd_btt(struct device *dev);
269
270struct nd_gen_sb {
271 char reserved[SZ_4K - 8];
272 __le64 checksum;
273};
274
275u64 nd_sb_checksum(struct nd_gen_sb *sb);
276#if IS_ENABLED(CONFIG_BTT)
277int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns);
278bool is_nd_btt(struct device *dev);
279struct device *nd_btt_create(struct nd_region *nd_region);
280#else
281static inline int nd_btt_probe(struct device *dev,
282 struct nd_namespace_common *ndns)
283{
284 return -ENODEV;
285}
286
287static inline bool is_nd_btt(struct device *dev)
288{
289 return false;
290}
291
292static inline struct device *nd_btt_create(struct nd_region *nd_region)
293{
294 return NULL;
295}
296#endif
297
298struct nd_pfn *to_nd_pfn(struct device *dev);
299#if IS_ENABLED(CONFIG_NVDIMM_PFN)
300
301#define MAX_NVDIMM_ALIGN 4
302
303int nd_pfn_probe(struct device *dev, struct nd_namespace_common *ndns);
304bool is_nd_pfn(struct device *dev);
305struct device *nd_pfn_create(struct nd_region *nd_region);
306struct device *nd_pfn_devinit(struct nd_pfn *nd_pfn,
307 struct nd_namespace_common *ndns);
308int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig);
309extern const struct attribute_group *nd_pfn_attribute_groups[];
310#else
311static inline int nd_pfn_probe(struct device *dev,
312 struct nd_namespace_common *ndns)
313{
314 return -ENODEV;
315}
316
317static inline bool is_nd_pfn(struct device *dev)
318{
319 return false;
320}
321
322static inline struct device *nd_pfn_create(struct nd_region *nd_region)
323{
324 return NULL;
325}
326
327static inline int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
328{
329 return -ENODEV;
330}
331#endif
332
333struct nd_dax *to_nd_dax(struct device *dev);
334#if IS_ENABLED(CONFIG_NVDIMM_DAX)
335int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
336bool is_nd_dax(struct device *dev);
337struct device *nd_dax_create(struct nd_region *nd_region);
338#else
339static inline int nd_dax_probe(struct device *dev,
340 struct nd_namespace_common *ndns)
341{
342 return -ENODEV;
343}
344
345static inline bool is_nd_dax(struct device *dev)
346{
347 return false;
348}
349
350static inline struct device *nd_dax_create(struct nd_region *nd_region)
351{
352 return NULL;
353}
354#endif
355
356int nd_region_to_nstype(struct nd_region *nd_region);
357int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
358u64 nd_region_interleave_set_cookie(struct nd_region *nd_region,
359 struct nd_namespace_index *nsindex);
360u64 nd_region_interleave_set_altcookie(struct nd_region *nd_region);
361void nvdimm_bus_lock(struct device *dev);
362void nvdimm_bus_unlock(struct device *dev);
363bool is_nvdimm_bus_locked(struct device *dev);
364int nvdimm_revalidate_disk(struct gendisk *disk);
365void nvdimm_drvdata_release(struct kref *kref);
366void put_ndd(struct nvdimm_drvdata *ndd);
367int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
368void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
369struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
370 struct nd_label_id *label_id, resource_size_t start,
371 resource_size_t n);
372resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
373bool nvdimm_namespace_locked(struct nd_namespace_common *ndns);
374struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
375int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
376int nvdimm_namespace_detach_btt(struct nd_btt *nd_btt);
377const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
378 char *name);
379unsigned int pmem_sector_size(struct nd_namespace_common *ndns);
380void nvdimm_badblocks_populate(struct nd_region *nd_region,
381 struct badblocks *bb, const struct resource *res);
382int devm_namespace_enable(struct device *dev, struct nd_namespace_common *ndns,
383 resource_size_t size);
384void devm_namespace_disable(struct device *dev,
385 struct nd_namespace_common *ndns);
386#if IS_ENABLED(CONFIG_ND_CLAIM)
387/* max struct page size independent of kernel config */
388#define MAX_STRUCT_PAGE_SIZE 64
389int nvdimm_setup_pfn(struct nd_pfn *nd_pfn, struct dev_pagemap *pgmap);
390#else
391static inline int nvdimm_setup_pfn(struct nd_pfn *nd_pfn,
392 struct dev_pagemap *pgmap)
393{
394 return -ENXIO;
395}
396#endif
397int nd_blk_region_init(struct nd_region *nd_region);
398int nd_region_activate(struct nd_region *nd_region);
399static inline bool is_bad_pmem(struct badblocks *bb, sector_t sector,
400 unsigned int len)
401{
402 if (bb->count) {
403 sector_t first_bad;
404 int num_bad;
405
406 return !!badblocks_check(bb, sector, len / 512, &first_bad,
407 &num_bad);
408 }
409
410 return false;
411}
412resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
413const u8 *nd_dev_to_uuid(struct device *dev);
414bool pmem_should_map_pages(struct device *dev);
415#endif /* __ND_H__ */
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/blkdev.h>
17#include <linux/device.h>
18#include <linux/mutex.h>
19#include <linux/ndctl.h>
20#include <linux/types.h>
21#include <linux/nd.h>
22#include "label.h"
23
24enum {
25 /*
26 * Limits the maximum number of block apertures a dimm can
27 * support and is an input to the geometry/on-disk-format of a
28 * BTT instance
29 */
30 ND_MAX_LANES = 256,
31 SECTOR_SHIFT = 9,
32 INT_LBASIZE_ALIGNMENT = 64,
33};
34
35struct nd_poison {
36 u64 start;
37 u64 length;
38 struct list_head list;
39};
40
41struct nvdimm_drvdata {
42 struct device *dev;
43 int nsindex_size;
44 struct nd_cmd_get_config_size nsarea;
45 void *data;
46 int ns_current, ns_next;
47 struct resource dpa;
48 struct kref kref;
49};
50
51struct nd_region_namespaces {
52 int count;
53 int active;
54};
55
56static inline struct nd_namespace_index *to_namespace_index(
57 struct nvdimm_drvdata *ndd, int i)
58{
59 if (i < 0)
60 return NULL;
61
62 return ndd->data + sizeof_namespace_index(ndd) * i;
63}
64
65static inline struct nd_namespace_index *to_current_namespace_index(
66 struct nvdimm_drvdata *ndd)
67{
68 return to_namespace_index(ndd, ndd->ns_current);
69}
70
71static inline struct nd_namespace_index *to_next_namespace_index(
72 struct nvdimm_drvdata *ndd)
73{
74 return to_namespace_index(ndd, ndd->ns_next);
75}
76
77#define nd_dbg_dpa(r, d, res, fmt, arg...) \
78 dev_dbg((r) ? &(r)->dev : (d)->dev, "%s: %.13s: %#llx @ %#llx " fmt, \
79 (r) ? dev_name((d)->dev) : "", res ? res->name : "null", \
80 (unsigned long long) (res ? resource_size(res) : 0), \
81 (unsigned long long) (res ? res->start : 0), ##arg)
82
83#define for_each_label(l, label, labels) \
84 for (l = 0; (label = labels ? labels[l] : NULL); l++)
85
86#define for_each_dpa_resource(ndd, res) \
87 for (res = (ndd)->dpa.child; res; res = res->sibling)
88
89#define for_each_dpa_resource_safe(ndd, res, next) \
90 for (res = (ndd)->dpa.child, next = res ? res->sibling : NULL; \
91 res; res = next, next = next ? next->sibling : NULL)
92
93struct nd_percpu_lane {
94 int count;
95 spinlock_t lock;
96};
97
98struct nd_region {
99 struct device dev;
100 struct ida ns_ida;
101 struct ida btt_ida;
102 struct ida pfn_ida;
103 unsigned long flags;
104 struct device *ns_seed;
105 struct device *btt_seed;
106 struct device *pfn_seed;
107 u16 ndr_mappings;
108 u64 ndr_size;
109 u64 ndr_start;
110 int id, num_lanes, ro, numa_node;
111 void *provider_data;
112 struct nd_interleave_set *nd_set;
113 struct nd_percpu_lane __percpu *lane;
114 struct nd_mapping mapping[0];
115};
116
117struct nd_blk_region {
118 int (*enable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
119 void (*disable)(struct nvdimm_bus *nvdimm_bus, struct device *dev);
120 int (*do_io)(struct nd_blk_region *ndbr, resource_size_t dpa,
121 void *iobuf, u64 len, int rw);
122 void *blk_provider_data;
123 struct nd_region nd_region;
124};
125
126/*
127 * Lookup next in the repeating sequence of 01, 10, and 11.
128 */
129static inline unsigned nd_inc_seq(unsigned seq)
130{
131 static const unsigned next[] = { 0, 2, 3, 1 };
132
133 return next[seq & 3];
134}
135
136struct btt;
137struct nd_btt {
138 struct device dev;
139 struct nd_namespace_common *ndns;
140 struct btt *btt;
141 unsigned long lbasize;
142 u8 *uuid;
143 int id;
144};
145
146enum nd_pfn_mode {
147 PFN_MODE_NONE,
148 PFN_MODE_RAM,
149 PFN_MODE_PMEM,
150};
151
152struct nd_pfn {
153 int id;
154 u8 *uuid;
155 struct device dev;
156 unsigned long align;
157 unsigned long npfns;
158 enum nd_pfn_mode mode;
159 struct nd_pfn_sb *pfn_sb;
160 struct nd_namespace_common *ndns;
161};
162
163enum nd_async_mode {
164 ND_SYNC,
165 ND_ASYNC,
166};
167
168int nd_integrity_init(struct gendisk *disk, unsigned long meta_size);
169void wait_nvdimm_bus_probe_idle(struct device *dev);
170void nd_device_register(struct device *dev);
171void nd_device_unregister(struct device *dev, enum nd_async_mode mode);
172void nd_device_notify(struct device *dev, enum nvdimm_event event);
173int nd_uuid_store(struct device *dev, u8 **uuid_out, const char *buf,
174 size_t len);
175ssize_t nd_sector_size_show(unsigned long current_lbasize,
176 const unsigned long *supported, char *buf);
177ssize_t nd_sector_size_store(struct device *dev, const char *buf,
178 unsigned long *current_lbasize, const unsigned long *supported);
179int __init nvdimm_init(void);
180int __init nd_region_init(void);
181void nvdimm_exit(void);
182void nd_region_exit(void);
183struct nvdimm;
184struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
185int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
186int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
187int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
188 void *buf, size_t len);
189long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
190 unsigned int len);
191struct nd_btt *to_nd_btt(struct device *dev);
192
193struct nd_gen_sb {
194 char reserved[SZ_4K - 8];
195 __le64 checksum;
196};
197
198u64 nd_sb_checksum(struct nd_gen_sb *sb);
199#if IS_ENABLED(CONFIG_BTT)
200int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata);
201bool is_nd_btt(struct device *dev);
202struct device *nd_btt_create(struct nd_region *nd_region);
203#else
204static inline int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
205{
206 return -ENODEV;
207}
208
209static inline bool is_nd_btt(struct device *dev)
210{
211 return false;
212}
213
214static inline struct device *nd_btt_create(struct nd_region *nd_region)
215{
216 return NULL;
217}
218#endif
219
220struct nd_pfn *to_nd_pfn(struct device *dev);
221#if IS_ENABLED(CONFIG_NVDIMM_PFN)
222int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata);
223bool is_nd_pfn(struct device *dev);
224struct device *nd_pfn_create(struct nd_region *nd_region);
225int nd_pfn_validate(struct nd_pfn *nd_pfn);
226#else
227static inline int nd_pfn_probe(struct nd_namespace_common *ndns, void *drvdata)
228{
229 return -ENODEV;
230}
231
232static inline bool is_nd_pfn(struct device *dev)
233{
234 return false;
235}
236
237static inline struct device *nd_pfn_create(struct nd_region *nd_region)
238{
239 return NULL;
240}
241
242static inline int nd_pfn_validate(struct nd_pfn *nd_pfn)
243{
244 return -ENODEV;
245}
246#endif
247
248struct nd_region *to_nd_region(struct device *dev);
249int nd_region_to_nstype(struct nd_region *nd_region);
250int nd_region_register_namespaces(struct nd_region *nd_region, int *err);
251u64 nd_region_interleave_set_cookie(struct nd_region *nd_region);
252void nvdimm_bus_lock(struct device *dev);
253void nvdimm_bus_unlock(struct device *dev);
254bool is_nvdimm_bus_locked(struct device *dev);
255int nvdimm_revalidate_disk(struct gendisk *disk);
256void nvdimm_drvdata_release(struct kref *kref);
257void put_ndd(struct nvdimm_drvdata *ndd);
258int nd_label_reserve_dpa(struct nvdimm_drvdata *ndd);
259void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res);
260struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
261 struct nd_label_id *label_id, resource_size_t start,
262 resource_size_t n);
263resource_size_t nvdimm_namespace_capacity(struct nd_namespace_common *ndns);
264struct nd_namespace_common *nvdimm_namespace_common_probe(struct device *dev);
265int nvdimm_namespace_attach_btt(struct nd_namespace_common *ndns);
266int nvdimm_namespace_detach_btt(struct nd_namespace_common *ndns);
267const char *nvdimm_namespace_disk_name(struct nd_namespace_common *ndns,
268 char *name);
269void nvdimm_badblocks_populate(struct nd_region *nd_region,
270 struct badblocks *bb, const struct resource *res);
271int nd_blk_region_init(struct nd_region *nd_region);
272void __nd_iostat_start(struct bio *bio, unsigned long *start);
273static inline bool nd_iostat_start(struct bio *bio, unsigned long *start)
274{
275 struct gendisk *disk = bio->bi_bdev->bd_disk;
276
277 if (!blk_queue_io_stat(disk->queue))
278 return false;
279
280 __nd_iostat_start(bio, start);
281 return true;
282}
283void nd_iostat_end(struct bio *bio, unsigned long start);
284resource_size_t nd_namespace_blk_validate(struct nd_namespace_blk *nsblk);
285const u8 *nd_dev_to_uuid(struct device *dev);
286bool pmem_should_map_pages(struct device *dev);
287#endif /* __ND_H__ */