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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#include <linux/blkdev.h>
6#include <linux/device.h>
7#include <linux/sizes.h>
8#include <linux/slab.h>
9#include <linux/fs.h>
10#include <linux/mm.h>
11#include "nd-core.h"
12#include "btt.h"
13#include "nd.h"
14
15static void nd_btt_release(struct device *dev)
16{
17 struct nd_region *nd_region = to_nd_region(dev->parent);
18 struct nd_btt *nd_btt = to_nd_btt(dev);
19
20 dev_dbg(dev, "trace\n");
21 nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
22 ida_free(&nd_region->btt_ida, nd_btt->id);
23 kfree(nd_btt->uuid);
24 kfree(nd_btt);
25}
26
27struct nd_btt *to_nd_btt(struct device *dev)
28{
29 struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
30
31 WARN_ON(!is_nd_btt(dev));
32 return nd_btt;
33}
34EXPORT_SYMBOL(to_nd_btt);
35
36static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
37 4096, 4104, 4160, 4224, 0 };
38
39static ssize_t sector_size_show(struct device *dev,
40 struct device_attribute *attr, char *buf)
41{
42 struct nd_btt *nd_btt = to_nd_btt(dev);
43
44 return nd_size_select_show(nd_btt->lbasize, btt_lbasize_supported, buf);
45}
46
47static ssize_t sector_size_store(struct device *dev,
48 struct device_attribute *attr, const char *buf, size_t len)
49{
50 struct nd_btt *nd_btt = to_nd_btt(dev);
51 ssize_t rc;
52
53 device_lock(dev);
54 nvdimm_bus_lock(dev);
55 rc = nd_size_select_store(dev, buf, &nd_btt->lbasize,
56 btt_lbasize_supported);
57 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
58 buf[len - 1] == '\n' ? "" : "\n");
59 nvdimm_bus_unlock(dev);
60 device_unlock(dev);
61
62 return rc ? rc : len;
63}
64static DEVICE_ATTR_RW(sector_size);
65
66static ssize_t uuid_show(struct device *dev,
67 struct device_attribute *attr, char *buf)
68{
69 struct nd_btt *nd_btt = to_nd_btt(dev);
70
71 if (nd_btt->uuid)
72 return sprintf(buf, "%pUb\n", nd_btt->uuid);
73 return sprintf(buf, "\n");
74}
75
76static ssize_t uuid_store(struct device *dev,
77 struct device_attribute *attr, const char *buf, size_t len)
78{
79 struct nd_btt *nd_btt = to_nd_btt(dev);
80 ssize_t rc;
81
82 device_lock(dev);
83 rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
84 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
85 buf[len - 1] == '\n' ? "" : "\n");
86 device_unlock(dev);
87
88 return rc ? rc : len;
89}
90static DEVICE_ATTR_RW(uuid);
91
92static ssize_t namespace_show(struct device *dev,
93 struct device_attribute *attr, char *buf)
94{
95 struct nd_btt *nd_btt = to_nd_btt(dev);
96 ssize_t rc;
97
98 nvdimm_bus_lock(dev);
99 rc = sprintf(buf, "%s\n", nd_btt->ndns
100 ? dev_name(&nd_btt->ndns->dev) : "");
101 nvdimm_bus_unlock(dev);
102 return rc;
103}
104
105static ssize_t namespace_store(struct device *dev,
106 struct device_attribute *attr, const char *buf, size_t len)
107{
108 struct nd_btt *nd_btt = to_nd_btt(dev);
109 ssize_t rc;
110
111 device_lock(dev);
112 nvdimm_bus_lock(dev);
113 rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
114 dev_dbg(dev, "result: %zd wrote: %s%s", rc, buf,
115 buf[len - 1] == '\n' ? "" : "\n");
116 nvdimm_bus_unlock(dev);
117 device_unlock(dev);
118
119 return rc;
120}
121static DEVICE_ATTR_RW(namespace);
122
123static ssize_t size_show(struct device *dev,
124 struct device_attribute *attr, char *buf)
125{
126 struct nd_btt *nd_btt = to_nd_btt(dev);
127 ssize_t rc;
128
129 device_lock(dev);
130 if (dev->driver)
131 rc = sprintf(buf, "%llu\n", nd_btt->size);
132 else {
133 /* no size to convey if the btt instance is disabled */
134 rc = -ENXIO;
135 }
136 device_unlock(dev);
137
138 return rc;
139}
140static DEVICE_ATTR_RO(size);
141
142static ssize_t log_zero_flags_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
144{
145 return sprintf(buf, "Y\n");
146}
147static DEVICE_ATTR_RO(log_zero_flags);
148
149static struct attribute *nd_btt_attributes[] = {
150 &dev_attr_sector_size.attr,
151 &dev_attr_namespace.attr,
152 &dev_attr_uuid.attr,
153 &dev_attr_size.attr,
154 &dev_attr_log_zero_flags.attr,
155 NULL,
156};
157
158static struct attribute_group nd_btt_attribute_group = {
159 .attrs = nd_btt_attributes,
160};
161
162static const struct attribute_group *nd_btt_attribute_groups[] = {
163 &nd_btt_attribute_group,
164 &nd_device_attribute_group,
165 &nd_numa_attribute_group,
166 NULL,
167};
168
169static const struct device_type nd_btt_device_type = {
170 .name = "nd_btt",
171 .release = nd_btt_release,
172 .groups = nd_btt_attribute_groups,
173};
174
175bool is_nd_btt(struct device *dev)
176{
177 return dev->type == &nd_btt_device_type;
178}
179EXPORT_SYMBOL(is_nd_btt);
180
181static struct lock_class_key nvdimm_btt_key;
182
183static struct device *__nd_btt_create(struct nd_region *nd_region,
184 unsigned long lbasize, uuid_t *uuid,
185 struct nd_namespace_common *ndns)
186{
187 struct nd_btt *nd_btt;
188 struct device *dev;
189
190 nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
191 if (!nd_btt)
192 return NULL;
193
194 nd_btt->id = ida_alloc(&nd_region->btt_ida, GFP_KERNEL);
195 if (nd_btt->id < 0)
196 goto out_nd_btt;
197
198 nd_btt->lbasize = lbasize;
199 if (uuid) {
200 uuid = kmemdup(uuid, 16, GFP_KERNEL);
201 if (!uuid)
202 goto out_put_id;
203 }
204 nd_btt->uuid = uuid;
205 dev = &nd_btt->dev;
206 dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
207 dev->parent = &nd_region->dev;
208 dev->type = &nd_btt_device_type;
209 device_initialize(&nd_btt->dev);
210 lockdep_set_class(&nd_btt->dev.mutex, &nvdimm_btt_key);
211 if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
212 dev_dbg(&ndns->dev, "failed, already claimed by %s\n",
213 dev_name(ndns->claim));
214 put_device(dev);
215 return NULL;
216 }
217 return dev;
218
219out_put_id:
220 ida_free(&nd_region->btt_ida, nd_btt->id);
221
222out_nd_btt:
223 kfree(nd_btt);
224 return NULL;
225}
226
227struct device *nd_btt_create(struct nd_region *nd_region)
228{
229 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
230
231 nd_device_register(dev);
232 return dev;
233}
234
235/**
236 * nd_btt_arena_is_valid - check if the metadata layout is valid
237 * @nd_btt: device with BTT geometry and backing device info
238 * @super: pointer to the arena's info block being tested
239 *
240 * Check consistency of the btt info block with itself by validating
241 * the checksum, and with the parent namespace by verifying the
242 * parent_uuid contained in the info block with the one supplied in.
243 *
244 * Returns:
245 * false for an invalid info block, true for a valid one
246 */
247bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
248{
249 const uuid_t *ns_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
250 uuid_t parent_uuid;
251 u64 checksum;
252
253 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
254 return false;
255
256 import_uuid(&parent_uuid, super->parent_uuid);
257 if (!uuid_is_null(&parent_uuid))
258 if (!uuid_equal(&parent_uuid, ns_uuid))
259 return false;
260
261 checksum = le64_to_cpu(super->checksum);
262 super->checksum = 0;
263 if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
264 return false;
265 super->checksum = cpu_to_le64(checksum);
266
267 /* TODO: figure out action for this */
268 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
269 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
270
271 return true;
272}
273EXPORT_SYMBOL(nd_btt_arena_is_valid);
274
275int nd_btt_version(struct nd_btt *nd_btt, struct nd_namespace_common *ndns,
276 struct btt_sb *btt_sb)
277{
278 if (ndns->claim_class == NVDIMM_CCLASS_BTT2) {
279 /* Probe/setup for BTT v2.0 */
280 nd_btt->initial_offset = 0;
281 nd_btt->version_major = 2;
282 nd_btt->version_minor = 0;
283 if (nvdimm_read_bytes(ndns, 0, btt_sb, sizeof(*btt_sb), 0))
284 return -ENXIO;
285 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
286 return -ENODEV;
287 if ((le16_to_cpu(btt_sb->version_major) != 2) ||
288 (le16_to_cpu(btt_sb->version_minor) != 0))
289 return -ENODEV;
290 } else {
291 /*
292 * Probe/setup for BTT v1.1 (NVDIMM_CCLASS_NONE or
293 * NVDIMM_CCLASS_BTT)
294 */
295 nd_btt->initial_offset = SZ_4K;
296 nd_btt->version_major = 1;
297 nd_btt->version_minor = 1;
298 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb), 0))
299 return -ENXIO;
300 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
301 return -ENODEV;
302 if ((le16_to_cpu(btt_sb->version_major) != 1) ||
303 (le16_to_cpu(btt_sb->version_minor) != 1))
304 return -ENODEV;
305 }
306 return 0;
307}
308EXPORT_SYMBOL(nd_btt_version);
309
310static int __nd_btt_probe(struct nd_btt *nd_btt,
311 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
312{
313 int rc;
314
315 if (!btt_sb || !ndns || !nd_btt)
316 return -ENODEV;
317
318 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
319 return -ENXIO;
320
321 rc = nd_btt_version(nd_btt, ndns, btt_sb);
322 if (rc < 0)
323 return rc;
324
325 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
326 nd_btt->uuid = kmemdup(&btt_sb->uuid, sizeof(uuid_t), GFP_KERNEL);
327 if (!nd_btt->uuid)
328 return -ENOMEM;
329
330 nd_device_register(&nd_btt->dev);
331
332 return 0;
333}
334
335int nd_btt_probe(struct device *dev, struct nd_namespace_common *ndns)
336{
337 int rc;
338 struct device *btt_dev;
339 struct btt_sb *btt_sb;
340 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
341
342 if (ndns->force_raw)
343 return -ENODEV;
344
345 switch (ndns->claim_class) {
346 case NVDIMM_CCLASS_NONE:
347 case NVDIMM_CCLASS_BTT:
348 case NVDIMM_CCLASS_BTT2:
349 break;
350 default:
351 return -ENODEV;
352 }
353
354 nvdimm_bus_lock(&ndns->dev);
355 btt_dev = __nd_btt_create(nd_region, 0, NULL, ndns);
356 nvdimm_bus_unlock(&ndns->dev);
357 if (!btt_dev)
358 return -ENOMEM;
359 btt_sb = devm_kzalloc(dev, sizeof(*btt_sb), GFP_KERNEL);
360 rc = __nd_btt_probe(to_nd_btt(btt_dev), ndns, btt_sb);
361 dev_dbg(dev, "btt: %s\n", rc == 0 ? dev_name(btt_dev) : "<none>");
362 if (rc < 0) {
363 struct nd_btt *nd_btt = to_nd_btt(btt_dev);
364
365 nd_detach_ndns(btt_dev, &nd_btt->ndns);
366 put_device(btt_dev);
367 }
368
369 return rc;
370}
371EXPORT_SYMBOL(nd_btt_probe);
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#include <linux/blkdev.h>
14#include <linux/device.h>
15#include <linux/genhd.h>
16#include <linux/sizes.h>
17#include <linux/slab.h>
18#include <linux/fs.h>
19#include <linux/mm.h>
20#include "nd-core.h"
21#include "btt.h"
22#include "nd.h"
23
24static void nd_btt_release(struct device *dev)
25{
26 struct nd_region *nd_region = to_nd_region(dev->parent);
27 struct nd_btt *nd_btt = to_nd_btt(dev);
28
29 dev_dbg(dev, "%s\n", __func__);
30 nd_detach_ndns(&nd_btt->dev, &nd_btt->ndns);
31 ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
32 kfree(nd_btt->uuid);
33 kfree(nd_btt);
34}
35
36static struct device_type nd_btt_device_type = {
37 .name = "nd_btt",
38 .release = nd_btt_release,
39};
40
41bool is_nd_btt(struct device *dev)
42{
43 return dev->type == &nd_btt_device_type;
44}
45EXPORT_SYMBOL(is_nd_btt);
46
47struct nd_btt *to_nd_btt(struct device *dev)
48{
49 struct nd_btt *nd_btt = container_of(dev, struct nd_btt, dev);
50
51 WARN_ON(!is_nd_btt(dev));
52 return nd_btt;
53}
54EXPORT_SYMBOL(to_nd_btt);
55
56static const unsigned long btt_lbasize_supported[] = { 512, 520, 528,
57 4096, 4104, 4160, 4224, 0 };
58
59static ssize_t sector_size_show(struct device *dev,
60 struct device_attribute *attr, char *buf)
61{
62 struct nd_btt *nd_btt = to_nd_btt(dev);
63
64 return nd_sector_size_show(nd_btt->lbasize, btt_lbasize_supported, buf);
65}
66
67static ssize_t sector_size_store(struct device *dev,
68 struct device_attribute *attr, const char *buf, size_t len)
69{
70 struct nd_btt *nd_btt = to_nd_btt(dev);
71 ssize_t rc;
72
73 device_lock(dev);
74 nvdimm_bus_lock(dev);
75 rc = nd_sector_size_store(dev, buf, &nd_btt->lbasize,
76 btt_lbasize_supported);
77 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
78 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
79 nvdimm_bus_unlock(dev);
80 device_unlock(dev);
81
82 return rc ? rc : len;
83}
84static DEVICE_ATTR_RW(sector_size);
85
86static ssize_t uuid_show(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 struct nd_btt *nd_btt = to_nd_btt(dev);
90
91 if (nd_btt->uuid)
92 return sprintf(buf, "%pUb\n", nd_btt->uuid);
93 return sprintf(buf, "\n");
94}
95
96static ssize_t uuid_store(struct device *dev,
97 struct device_attribute *attr, const char *buf, size_t len)
98{
99 struct nd_btt *nd_btt = to_nd_btt(dev);
100 ssize_t rc;
101
102 device_lock(dev);
103 rc = nd_uuid_store(dev, &nd_btt->uuid, buf, len);
104 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
105 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
106 device_unlock(dev);
107
108 return rc ? rc : len;
109}
110static DEVICE_ATTR_RW(uuid);
111
112static ssize_t namespace_show(struct device *dev,
113 struct device_attribute *attr, char *buf)
114{
115 struct nd_btt *nd_btt = to_nd_btt(dev);
116 ssize_t rc;
117
118 nvdimm_bus_lock(dev);
119 rc = sprintf(buf, "%s\n", nd_btt->ndns
120 ? dev_name(&nd_btt->ndns->dev) : "");
121 nvdimm_bus_unlock(dev);
122 return rc;
123}
124
125static ssize_t namespace_store(struct device *dev,
126 struct device_attribute *attr, const char *buf, size_t len)
127{
128 struct nd_btt *nd_btt = to_nd_btt(dev);
129 ssize_t rc;
130
131 device_lock(dev);
132 nvdimm_bus_lock(dev);
133 rc = nd_namespace_store(dev, &nd_btt->ndns, buf, len);
134 dev_dbg(dev, "%s: result: %zd wrote: %s%s", __func__,
135 rc, buf, buf[len - 1] == '\n' ? "" : "\n");
136 nvdimm_bus_unlock(dev);
137 device_unlock(dev);
138
139 return rc;
140}
141static DEVICE_ATTR_RW(namespace);
142
143static struct attribute *nd_btt_attributes[] = {
144 &dev_attr_sector_size.attr,
145 &dev_attr_namespace.attr,
146 &dev_attr_uuid.attr,
147 NULL,
148};
149
150static struct attribute_group nd_btt_attribute_group = {
151 .attrs = nd_btt_attributes,
152};
153
154static const struct attribute_group *nd_btt_attribute_groups[] = {
155 &nd_btt_attribute_group,
156 &nd_device_attribute_group,
157 &nd_numa_attribute_group,
158 NULL,
159};
160
161static struct device *__nd_btt_create(struct nd_region *nd_region,
162 unsigned long lbasize, u8 *uuid,
163 struct nd_namespace_common *ndns)
164{
165 struct nd_btt *nd_btt;
166 struct device *dev;
167
168 nd_btt = kzalloc(sizeof(*nd_btt), GFP_KERNEL);
169 if (!nd_btt)
170 return NULL;
171
172 nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
173 if (nd_btt->id < 0) {
174 kfree(nd_btt);
175 return NULL;
176 }
177
178 nd_btt->lbasize = lbasize;
179 if (uuid)
180 uuid = kmemdup(uuid, 16, GFP_KERNEL);
181 nd_btt->uuid = uuid;
182 dev = &nd_btt->dev;
183 dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
184 dev->parent = &nd_region->dev;
185 dev->type = &nd_btt_device_type;
186 dev->groups = nd_btt_attribute_groups;
187 device_initialize(&nd_btt->dev);
188 if (ndns && !__nd_attach_ndns(&nd_btt->dev, ndns, &nd_btt->ndns)) {
189 dev_dbg(&ndns->dev, "%s failed, already claimed by %s\n",
190 __func__, dev_name(ndns->claim));
191 put_device(dev);
192 return NULL;
193 }
194 return dev;
195}
196
197struct device *nd_btt_create(struct nd_region *nd_region)
198{
199 struct device *dev = __nd_btt_create(nd_region, 0, NULL, NULL);
200
201 if (dev)
202 __nd_device_register(dev);
203 return dev;
204}
205
206static bool uuid_is_null(u8 *uuid)
207{
208 static const u8 null_uuid[16];
209
210 return (memcmp(uuid, null_uuid, 16) == 0);
211}
212
213/**
214 * nd_btt_arena_is_valid - check if the metadata layout is valid
215 * @nd_btt: device with BTT geometry and backing device info
216 * @super: pointer to the arena's info block being tested
217 *
218 * Check consistency of the btt info block with itself by validating
219 * the checksum, and with the parent namespace by verifying the
220 * parent_uuid contained in the info block with the one supplied in.
221 *
222 * Returns:
223 * false for an invalid info block, true for a valid one
224 */
225bool nd_btt_arena_is_valid(struct nd_btt *nd_btt, struct btt_sb *super)
226{
227 const u8 *parent_uuid = nd_dev_to_uuid(&nd_btt->ndns->dev);
228 u64 checksum;
229
230 if (memcmp(super->signature, BTT_SIG, BTT_SIG_LEN) != 0)
231 return false;
232
233 if (!uuid_is_null(super->parent_uuid))
234 if (memcmp(super->parent_uuid, parent_uuid, 16) != 0)
235 return false;
236
237 checksum = le64_to_cpu(super->checksum);
238 super->checksum = 0;
239 if (checksum != nd_sb_checksum((struct nd_gen_sb *) super))
240 return false;
241 super->checksum = cpu_to_le64(checksum);
242
243 /* TODO: figure out action for this */
244 if ((le32_to_cpu(super->flags) & IB_FLAG_ERROR_MASK) != 0)
245 dev_info(&nd_btt->dev, "Found arena with an error flag\n");
246
247 return true;
248}
249EXPORT_SYMBOL(nd_btt_arena_is_valid);
250
251static int __nd_btt_probe(struct nd_btt *nd_btt,
252 struct nd_namespace_common *ndns, struct btt_sb *btt_sb)
253{
254 if (!btt_sb || !ndns || !nd_btt)
255 return -ENODEV;
256
257 if (nvdimm_read_bytes(ndns, SZ_4K, btt_sb, sizeof(*btt_sb)))
258 return -ENXIO;
259
260 if (nvdimm_namespace_capacity(ndns) < SZ_16M)
261 return -ENXIO;
262
263 if (!nd_btt_arena_is_valid(nd_btt, btt_sb))
264 return -ENODEV;
265
266 nd_btt->lbasize = le32_to_cpu(btt_sb->external_lbasize);
267 nd_btt->uuid = kmemdup(btt_sb->uuid, 16, GFP_KERNEL);
268 if (!nd_btt->uuid)
269 return -ENOMEM;
270
271 __nd_device_register(&nd_btt->dev);
272
273 return 0;
274}
275
276int nd_btt_probe(struct nd_namespace_common *ndns, void *drvdata)
277{
278 int rc;
279 struct device *dev;
280 struct btt_sb *btt_sb;
281 struct nd_region *nd_region = to_nd_region(ndns->dev.parent);
282
283 if (ndns->force_raw)
284 return -ENODEV;
285
286 nvdimm_bus_lock(&ndns->dev);
287 dev = __nd_btt_create(nd_region, 0, NULL, ndns);
288 nvdimm_bus_unlock(&ndns->dev);
289 if (!dev)
290 return -ENOMEM;
291 dev_set_drvdata(dev, drvdata);
292 btt_sb = kzalloc(sizeof(*btt_sb), GFP_KERNEL);
293 rc = __nd_btt_probe(to_nd_btt(dev), ndns, btt_sb);
294 kfree(btt_sb);
295 dev_dbg(&ndns->dev, "%s: btt: %s\n", __func__,
296 rc == 0 ? dev_name(dev) : "<none>");
297 if (rc < 0) {
298 struct nd_btt *nd_btt = to_nd_btt(dev);
299
300 __nd_detach_ndns(dev, &nd_btt->ndns);
301 put_device(dev);
302 }
303
304 return rc;
305}
306EXPORT_SYMBOL(nd_btt_probe);