summaryrefslogtreecommitdiff
path: root/drivers/nvdimm/dimm_devs.c
blob: 1273873582be7cdbdafc90bc967e1bea3208244a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2013-2015 Intel Corporation. All rights reserved.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/device.h>
#include <linux/ndctl.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include "nd-core.h"
#include "label.h"
#include "pmem.h"
#include "nd.h"

static DEFINE_IDA(dimm_ida);

/*
 * Retrieve bus and dimm handle and return if this bus supports
 * get_config_data commands
 */
int nvdimm_check_config_data(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	if (!nvdimm->cmd_mask ||
	    !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
		if (test_bit(NDD_LABELING, &nvdimm->flags))
			return -ENXIO;
		else
			return -ENOTTY;
	}

	return 0;
}

static int validate_dimm(struct nvdimm_drvdata *ndd)
{
	int rc;

	if (!ndd)
		return -EINVAL;

	rc = nvdimm_check_config_data(ndd->dev);
	if (rc)
		dev_dbg(ndd->dev, "%ps: %s error: %d\n",
				__builtin_return_address(0), __func__, rc);
	return rc;
}

/**
 * nvdimm_init_nsarea - determine the geometry of a dimm's namespace area
 * @nvdimm: dimm to initialize
 */
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd)
{
	struct nd_cmd_get_config_size *cmd = &ndd->nsarea;
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
	struct nvdimm_bus_descriptor *nd_desc;
	int rc = validate_dimm(ndd);
	int cmd_rc = 0;

	if (rc)
		return rc;

	if (cmd->config_size)
		return 0; /* already valid */

	memset(cmd, 0, sizeof(*cmd));
	nd_desc = nvdimm_bus->nd_desc;
	rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
			ND_CMD_GET_CONFIG_SIZE, cmd, sizeof(*cmd), &cmd_rc);
	if (rc < 0)
		return rc;
	return cmd_rc;
}

int nvdimm_get_config_data(struct nvdimm_drvdata *ndd, void *buf,
			   size_t offset, size_t len)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	int rc = validate_dimm(ndd), cmd_rc = 0;
	struct nd_cmd_get_config_data_hdr *cmd;
	size_t max_cmd_size, buf_offset;

	if (rc)
		return rc;

	if (offset + len > ndd->nsarea.config_size)
		return -ENXIO;

	max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
	cmd = kvzalloc(max_cmd_size + sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	for (buf_offset = 0; len;
	     len -= cmd->in_length, buf_offset += cmd->in_length) {
		size_t cmd_size;

		cmd->in_offset = offset + buf_offset;
		cmd->in_length = min(max_cmd_size, len);

		cmd_size = sizeof(*cmd) + cmd->in_length;

		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
				ND_CMD_GET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
		if (rc < 0)
			break;
		if (cmd_rc < 0) {
			rc = cmd_rc;
			break;
		}

		/* out_buf should be valid, copy it into our output buffer */
		memcpy(buf + buf_offset, cmd->out_buf, cmd->in_length);
	}
	kvfree(cmd);

	return rc;
}

int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,
		void *buf, size_t len)
{
	size_t max_cmd_size, buf_offset;
	struct nd_cmd_set_config_hdr *cmd;
	int rc = validate_dimm(ndd), cmd_rc = 0;
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;

	if (rc)
		return rc;

	if (offset + len > ndd->nsarea.config_size)
		return -ENXIO;

	max_cmd_size = min_t(u32, len, ndd->nsarea.max_xfer);
	cmd = kvzalloc(max_cmd_size + sizeof(*cmd) + sizeof(u32), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	for (buf_offset = 0; len; len -= cmd->in_length,
			buf_offset += cmd->in_length) {
		size_t cmd_size;

		cmd->in_offset = offset + buf_offset;
		cmd->in_length = min(max_cmd_size, len);
		memcpy(cmd->in_buf, buf + buf_offset, cmd->in_length);

		/* status is output in the last 4-bytes of the command buffer */
		cmd_size = sizeof(*cmd) + cmd->in_length + sizeof(u32);

		rc = nd_desc->ndctl(nd_desc, to_nvdimm(ndd->dev),
				ND_CMD_SET_CONFIG_DATA, cmd, cmd_size, &cmd_rc);
		if (rc < 0)
			break;
		if (cmd_rc < 0) {
			rc = cmd_rc;
			break;
		}
	}
	kvfree(cmd);

	return rc;
}

void nvdimm_set_labeling(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	set_bit(NDD_LABELING, &nvdimm->flags);
}

void nvdimm_set_locked(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	set_bit(NDD_LOCKED, &nvdimm->flags);
}

void nvdimm_clear_locked(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	clear_bit(NDD_LOCKED, &nvdimm->flags);
}

static void nvdimm_release(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	ida_simple_remove(&dimm_ida, nvdimm->id);
	kfree(nvdimm);
}

struct nvdimm *to_nvdimm(struct device *dev)
{
	struct nvdimm *nvdimm = container_of(dev, struct nvdimm, dev);

	WARN_ON(!is_nvdimm(dev));
	return nvdimm;
}
EXPORT_SYMBOL_GPL(to_nvdimm);

struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping)
{
	struct nvdimm *nvdimm = nd_mapping->nvdimm;

	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));

	return dev_get_drvdata(&nvdimm->dev);
}
EXPORT_SYMBOL(to_ndd);

void nvdimm_drvdata_release(struct kref *kref)
{
	struct nvdimm_drvdata *ndd = container_of(kref, typeof(*ndd), kref);
	struct device *dev = ndd->dev;
	struct resource *res, *_r;

	dev_dbg(dev, "trace\n");
	nvdimm_bus_lock(dev);
	for_each_dpa_resource_safe(ndd, res, _r)
		nvdimm_free_dpa(ndd, res);
	nvdimm_bus_unlock(dev);

	kvfree(ndd->data);
	kfree(ndd);
	put_device(dev);
}

void get_ndd(struct nvdimm_drvdata *ndd)
{
	kref_get(&ndd->kref);
}

void put_ndd(struct nvdimm_drvdata *ndd)
{
	if (ndd)
		kref_put(&ndd->kref, nvdimm_drvdata_release);
}

const char *nvdimm_name(struct nvdimm *nvdimm)
{
	return dev_name(&nvdimm->dev);
}
EXPORT_SYMBOL_GPL(nvdimm_name);

struct kobject *nvdimm_kobj(struct nvdimm *nvdimm)
{
	return &nvdimm->dev.kobj;
}
EXPORT_SYMBOL_GPL(nvdimm_kobj);

unsigned long nvdimm_cmd_mask(struct nvdimm *nvdimm)
{
	return nvdimm->cmd_mask;
}
EXPORT_SYMBOL_GPL(nvdimm_cmd_mask);

void *nvdimm_provider_data(struct nvdimm *nvdimm)
{
	if (nvdimm)
		return nvdimm->provider_data;
	return NULL;
}
EXPORT_SYMBOL_GPL(nvdimm_provider_data);

static ssize_t commands_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);
	int cmd, len = 0;

	if (!nvdimm->cmd_mask)
		return sprintf(buf, "\n");

	for_each_set_bit(cmd, &nvdimm->cmd_mask, BITS_PER_LONG)
		len += sprintf(buf + len, "%s ", nvdimm_cmd_name(cmd));
	len += sprintf(buf + len, "\n");
	return len;
}
static DEVICE_ATTR_RO(commands);

static ssize_t flags_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	return sprintf(buf, "%s%s\n",
			test_bit(NDD_LABELING, &nvdimm->flags) ? "label " : "",
			test_bit(NDD_LOCKED, &nvdimm->flags) ? "lock " : "");
}
static DEVICE_ATTR_RO(flags);

static ssize_t state_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	/*
	 * The state may be in the process of changing, userspace should
	 * quiesce probing if it wants a static answer
	 */
	nvdimm_bus_lock(dev);
	nvdimm_bus_unlock(dev);
	return sprintf(buf, "%s\n", atomic_read(&nvdimm->busy)
			? "active" : "idle");
}
static DEVICE_ATTR_RO(state);

static ssize_t __available_slots_show(struct nvdimm_drvdata *ndd, char *buf)
{
	struct device *dev;
	ssize_t rc;
	u32 nfree;

	if (!ndd)
		return -ENXIO;

	dev = ndd->dev;
	nvdimm_bus_lock(dev);
	nfree = nd_label_nfree(ndd);
	if (nfree - 1 > nfree) {
		dev_WARN_ONCE(dev, 1, "we ate our last label?\n");
		nfree = 0;
	} else
		nfree--;
	rc = sprintf(buf, "%d\n", nfree);
	nvdimm_bus_unlock(dev);
	return rc;
}

static ssize_t available_slots_show(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	ssize_t rc;

	device_lock(dev);
	rc = __available_slots_show(dev_get_drvdata(dev), buf);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(available_slots);

static ssize_t security_show(struct device *dev,
			     struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	/*
	 * For the test version we need to poll the "hardware" in order
	 * to get the updated status for unlock testing.
	 */
	if (IS_ENABLED(CONFIG_NVDIMM_SECURITY_TEST))
		nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);

	if (test_bit(NVDIMM_SECURITY_OVERWRITE, &nvdimm->sec.flags))
		return sprintf(buf, "overwrite\n");
	if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
		return sprintf(buf, "disabled\n");
	if (test_bit(NVDIMM_SECURITY_UNLOCKED, &nvdimm->sec.flags))
		return sprintf(buf, "unlocked\n");
	if (test_bit(NVDIMM_SECURITY_LOCKED, &nvdimm->sec.flags))
		return sprintf(buf, "locked\n");
	return -ENOTTY;
}

static ssize_t frozen_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	return sprintf(buf, "%d\n", test_bit(NVDIMM_SECURITY_FROZEN,
				&nvdimm->sec.flags));
}
static DEVICE_ATTR_RO(frozen);

static ssize_t security_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t len)

{
	ssize_t rc;

	/*
	 * Require all userspace triggered security management to be
	 * done while probing is idle and the DIMM is not in active use
	 * in any region.
	 */
	device_lock(dev);
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	rc = nvdimm_security_store(dev, buf, len);
	nvdimm_bus_unlock(dev);
	device_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RW(security);

static struct attribute *nvdimm_attributes[] = {
	&dev_attr_state.attr,
	&dev_attr_flags.attr,
	&dev_attr_commands.attr,
	&dev_attr_available_slots.attr,
	&dev_attr_security.attr,
	&dev_attr_frozen.attr,
	NULL,
};

static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, typeof(*dev), kobj);
	struct nvdimm *nvdimm = to_nvdimm(dev);

	if (a != &dev_attr_security.attr && a != &dev_attr_frozen.attr)
		return a->mode;
	if (!nvdimm->sec.flags)
		return 0;

	if (a == &dev_attr_security.attr) {
		/* Are there any state mutation ops (make writable)? */
		if (nvdimm->sec.ops->freeze || nvdimm->sec.ops->disable
				|| nvdimm->sec.ops->change_key
				|| nvdimm->sec.ops->erase
				|| nvdimm->sec.ops->overwrite)
			return a->mode;
		return 0444;
	}

	if (nvdimm->sec.ops->freeze)
		return a->mode;
	return 0;
}

static const struct attribute_group nvdimm_attribute_group = {
	.attrs = nvdimm_attributes,
	.is_visible = nvdimm_visible,
};

static ssize_t result_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);
	enum nvdimm_fwa_result result;

	if (!nvdimm->fw_ops)
		return -EOPNOTSUPP;

	nvdimm_bus_lock(dev);
	result = nvdimm->fw_ops->activate_result(nvdimm);
	nvdimm_bus_unlock(dev);

	switch (result) {
	case NVDIMM_FWA_RESULT_NONE:
		return sprintf(buf, "none\n");
	case NVDIMM_FWA_RESULT_SUCCESS:
		return sprintf(buf, "success\n");
	case NVDIMM_FWA_RESULT_FAIL:
		return sprintf(buf, "fail\n");
	case NVDIMM_FWA_RESULT_NOTSTAGED:
		return sprintf(buf, "not_staged\n");
	case NVDIMM_FWA_RESULT_NEEDRESET:
		return sprintf(buf, "need_reset\n");
	default:
		return -ENXIO;
	}
}
static DEVICE_ATTR_ADMIN_RO(result);

static ssize_t activate_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);
	enum nvdimm_fwa_state state;

	if (!nvdimm->fw_ops)
		return -EOPNOTSUPP;

	nvdimm_bus_lock(dev);
	state = nvdimm->fw_ops->activate_state(nvdimm);
	nvdimm_bus_unlock(dev);

	switch (state) {
	case NVDIMM_FWA_IDLE:
		return sprintf(buf, "idle\n");
	case NVDIMM_FWA_BUSY:
		return sprintf(buf, "busy\n");
	case NVDIMM_FWA_ARMED:
		return sprintf(buf, "armed\n");
	default:
		return -ENXIO;
	}
}

static ssize_t activate_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t len)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);
	enum nvdimm_fwa_trigger arg;
	int rc;

	if (!nvdimm->fw_ops)
		return -EOPNOTSUPP;

	if (sysfs_streq(buf, "arm"))
		arg = NVDIMM_FWA_ARM;
	else if (sysfs_streq(buf, "disarm"))
		arg = NVDIMM_FWA_DISARM;
	else
		return -EINVAL;

	nvdimm_bus_lock(dev);
	rc = nvdimm->fw_ops->arm(nvdimm, arg);
	nvdimm_bus_unlock(dev);

	if (rc < 0)
		return rc;
	return len;
}
static DEVICE_ATTR_ADMIN_RW(activate);

static struct attribute *nvdimm_firmware_attributes[] = {
	&dev_attr_activate.attr,
	&dev_attr_result.attr,
	NULL,
};

static umode_t nvdimm_firmware_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, typeof(*dev), kobj);
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);
	struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc;
	struct nvdimm *nvdimm = to_nvdimm(dev);
	enum nvdimm_fwa_capability cap;

	if (!nd_desc->fw_ops)
		return 0;
	if (!nvdimm->fw_ops)
		return 0;

	nvdimm_bus_lock(dev);
	cap = nd_desc->fw_ops->capability(nd_desc);
	nvdimm_bus_unlock(dev);

	if (cap < NVDIMM_FWA_CAP_QUIESCE)
		return 0;

	return a->mode;
}

static const struct attribute_group nvdimm_firmware_attribute_group = {
	.name = "firmware",
	.attrs = nvdimm_firmware_attributes,
	.is_visible = nvdimm_firmware_visible,
};

static const struct attribute_group *nvdimm_attribute_groups[] = {
	&nd_device_attribute_group,
	&nvdimm_attribute_group,
	&nvdimm_firmware_attribute_group,
	NULL,
};

static const struct device_type nvdimm_device_type = {
	.name = "nvdimm",
	.release = nvdimm_release,
	.groups = nvdimm_attribute_groups,
};

bool is_nvdimm(const struct device *dev)
{
	return dev->type == &nvdimm_device_type;
}

static struct lock_class_key nvdimm_key;

struct nvdimm *__nvdimm_create(struct nvdimm_bus *nvdimm_bus,
		void *provider_data, const struct attribute_group **groups,
		unsigned long flags, unsigned long cmd_mask, int num_flush,
		struct resource *flush_wpq, const char *dimm_id,
		const struct nvdimm_security_ops *sec_ops,
		const struct nvdimm_fw_ops *fw_ops)
{
	struct nvdimm *nvdimm = kzalloc(sizeof(*nvdimm), GFP_KERNEL);
	struct device *dev;

	if (!nvdimm)
		return NULL;

	nvdimm->id = ida_simple_get(&dimm_ida, 0, 0, GFP_KERNEL);
	if (nvdimm->id < 0) {
		kfree(nvdimm);
		return NULL;
	}

	nvdimm->dimm_id = dimm_id;
	nvdimm->provider_data = provider_data;
	nvdimm->flags = flags;
	nvdimm->cmd_mask = cmd_mask;
	nvdimm->num_flush = num_flush;
	nvdimm->flush_wpq = flush_wpq;
	atomic_set(&nvdimm->busy, 0);
	dev = &nvdimm->dev;
	dev_set_name(dev, "nmem%d", nvdimm->id);
	dev->parent = &nvdimm_bus->dev;
	dev->type = &nvdimm_device_type;
	dev->devt = MKDEV(nvdimm_major, nvdimm->id);
	dev->groups = groups;
	nvdimm->sec.ops = sec_ops;
	nvdimm->fw_ops = fw_ops;
	nvdimm->sec.overwrite_tmo = 0;
	INIT_DELAYED_WORK(&nvdimm->dwork, nvdimm_security_overwrite_query);
	/*
	 * Security state must be initialized before device_add() for
	 * attribute visibility.
	 */
	/* get security state and extended (master) state */
	nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
	nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
	device_initialize(dev);
	lockdep_set_class(&dev->mutex, &nvdimm_key);
	if (test_bit(NDD_REGISTER_SYNC, &flags))
		nd_device_register_sync(dev);
	else
		nd_device_register(dev);

	return nvdimm;
}
EXPORT_SYMBOL_GPL(__nvdimm_create);

void nvdimm_delete(struct nvdimm *nvdimm)
{
	struct device *dev = &nvdimm->dev;
	bool dev_put = false;

	/* We are shutting down. Make state frozen artificially. */
	nvdimm_bus_lock(dev);
	set_bit(NVDIMM_SECURITY_FROZEN, &nvdimm->sec.flags);
	if (test_and_clear_bit(NDD_WORK_PENDING, &nvdimm->flags))
		dev_put = true;
	nvdimm_bus_unlock(dev);
	cancel_delayed_work_sync(&nvdimm->dwork);
	if (dev_put)
		put_device(dev);
	nd_device_unregister(dev, ND_SYNC);
}
EXPORT_SYMBOL_GPL(nvdimm_delete);

static void shutdown_security_notify(void *data)
{
	struct nvdimm *nvdimm = data;

	sysfs_put(nvdimm->sec.overwrite_state);
}

int nvdimm_security_setup_events(struct device *dev)
{
	struct nvdimm *nvdimm = to_nvdimm(dev);

	if (!nvdimm->sec.flags || !nvdimm->sec.ops
			|| !nvdimm->sec.ops->overwrite)
		return 0;
	nvdimm->sec.overwrite_state = sysfs_get_dirent(dev->kobj.sd, "security");
	if (!nvdimm->sec.overwrite_state)
		return -ENOMEM;

	return devm_add_action_or_reset(dev, shutdown_security_notify, nvdimm);
}
EXPORT_SYMBOL_GPL(nvdimm_security_setup_events);

int nvdimm_in_overwrite(struct nvdimm *nvdimm)
{
	return test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
}
EXPORT_SYMBOL_GPL(nvdimm_in_overwrite);

int nvdimm_security_freeze(struct nvdimm *nvdimm)
{
	int rc;

	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm->dev));

	if (!nvdimm->sec.ops || !nvdimm->sec.ops->freeze)
		return -EOPNOTSUPP;

	if (!nvdimm->sec.flags)
		return -EIO;

	if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
		dev_warn(&nvdimm->dev, "Overwrite operation in progress.\n");
		return -EBUSY;
	}

	rc = nvdimm->sec.ops->freeze(nvdimm);
	nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);

	return rc;
}

static unsigned long dpa_align(struct nd_region *nd_region)
{
	struct device *dev = &nd_region->dev;

	if (dev_WARN_ONCE(dev, !is_nvdimm_bus_locked(dev),
				"bus lock required for capacity provision\n"))
		return 0;
	if (dev_WARN_ONCE(dev, !nd_region->ndr_mappings || nd_region->align
				% nd_region->ndr_mappings,
				"invalid region align %#lx mappings: %d\n",
				nd_region->align, nd_region->ndr_mappings))
		return 0;
	return nd_region->align / nd_region->ndr_mappings;
}

/**
 * nd_pmem_max_contiguous_dpa - For the given dimm+region, return the max
 *			   contiguous unallocated dpa range.
 * @nd_region: constrain available space check to this reference region
 * @nd_mapping: container of dpa-resource-root + labels
 */
resource_size_t nd_pmem_max_contiguous_dpa(struct nd_region *nd_region,
					   struct nd_mapping *nd_mapping)
{
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	struct nvdimm_bus *nvdimm_bus;
	resource_size_t max = 0;
	struct resource *res;
	unsigned long align;

	/* if a dimm is disabled the available capacity is zero */
	if (!ndd)
		return 0;

	align = dpa_align(nd_region);
	if (!align)
		return 0;

	nvdimm_bus = walk_to_nvdimm_bus(ndd->dev);
	if (__reserve_free_pmem(&nd_region->dev, nd_mapping->nvdimm))
		return 0;
	for_each_dpa_resource(ndd, res) {
		resource_size_t start, end;

		if (strcmp(res->name, "pmem-reserve") != 0)
			continue;
		/* trim free space relative to current alignment setting */
		start = ALIGN(res->start, align);
		end = ALIGN_DOWN(res->end + 1, align) - 1;
		if (end < start)
			continue;
		if (end - start + 1 > max)
			max = end - start + 1;
	}
	release_free_pmem(nvdimm_bus, nd_mapping);
	return max;
}

/**
 * nd_pmem_available_dpa - for the given dimm+region account unallocated dpa
 * @nd_mapping: container of dpa-resource-root + labels
 * @nd_region: constrain available space check to this reference region
 *
 * Validate that a PMEM label, if present, aligns with the start of an
 * interleave set.
 */
resource_size_t nd_pmem_available_dpa(struct nd_region *nd_region,
				      struct nd_mapping *nd_mapping)
{
	struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);
	resource_size_t map_start, map_end, busy = 0;
	struct resource *res;
	unsigned long align;

	if (!ndd)
		return 0;

	align = dpa_align(nd_region);
	if (!align)
		return 0;

	map_start = nd_mapping->start;
	map_end = map_start + nd_mapping->size - 1;
	for_each_dpa_resource(ndd, res) {
		resource_size_t start, end;

		start = ALIGN_DOWN(res->start, align);
		end = ALIGN(res->end + 1, align) - 1;
		if (start >= map_start && start < map_end) {
			if (end > map_end) {
				nd_dbg_dpa(nd_region, ndd, res,
					   "misaligned to iset\n");
				return 0;
			}
			busy += end - start + 1;
		} else if (end >= map_start && end <= map_end) {
			busy += end - start + 1;
		} else if (map_start > start && map_start < end) {
			/* total eclipse of the mapping */
			busy += nd_mapping->size;
		}
	}

	if (busy < nd_mapping->size)
		return ALIGN_DOWN(nd_mapping->size - busy, align);
	return 0;
}

void nvdimm_free_dpa(struct nvdimm_drvdata *ndd, struct resource *res)
{
	WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
	kfree(res->name);
	__release_region(&ndd->dpa, res->start, resource_size(res));
}

struct resource *nvdimm_allocate_dpa(struct nvdimm_drvdata *ndd,
		struct nd_label_id *label_id, resource_size_t start,
		resource_size_t n)
{
	char *name = kmemdup(label_id, sizeof(*label_id), GFP_KERNEL);
	struct resource *res;

	if (!name)
		return NULL;

	WARN_ON_ONCE(!is_nvdimm_bus_locked(ndd->dev));
	res = __request_region(&ndd->dpa, start, n, name, 0);
	if (!res)
		kfree(name);
	return res;
}

/**
 * nvdimm_allocated_dpa - sum up the dpa currently allocated to this label_id
 * @nvdimm: container of dpa-resource-root + labels
 * @label_id: dpa resource name of the form pmem-<human readable uuid>
 */
resource_size_t nvdimm_allocated_dpa(struct nvdimm_drvdata *ndd,
		struct nd_label_id *label_id)
{
	resource_size_t allocated = 0;
	struct resource *res;

	for_each_dpa_resource(ndd, res)
		if (strcmp(res->name, label_id->id) == 0)
			allocated += resource_size(res);

	return allocated;
}

static int count_dimms(struct device *dev, void *c)
{
	int *count = c;

	if (is_nvdimm(dev))
		(*count)++;
	return 0;
}

int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count)
{
	int count = 0;
	/* Flush any possible dimm registration failures */
	nd_synchronize();

	device_for_each_child(&nvdimm_bus->dev, &count, count_dimms);
	dev_dbg(&nvdimm_bus->dev, "count: %d\n", count);
	if (count != dimm_count)
		return -ENXIO;
	return 0;
}
EXPORT_SYMBOL_GPL(nvdimm_bus_check_dimm_count);

void __exit nvdimm_devs_exit(void)
{
	ida_destroy(&dimm_ida);
}