summaryrefslogtreecommitdiff
path: root/drivers/nvdimm/region_devs.c
blob: 4fd92389fa7e5d619c84bb509e8f79334ab93a79 (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
/*
 * 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.
 */
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sort.h>
#include <linux/io.h>
#include <linux/nd.h>
#include "nd-core.h"
#include "nd.h"

static DEFINE_IDA(region_ida);

static void nd_region_release(struct device *dev)
{
	struct nd_region *nd_region = to_nd_region(dev);
	u16 i;

	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		put_device(&nvdimm->dev);
	}
	ida_simple_remove(&region_ida, nd_region->id);
	kfree(nd_region);
}

static struct device_type nd_blk_device_type = {
	.name = "nd_blk",
	.release = nd_region_release,
};

static struct device_type nd_pmem_device_type = {
	.name = "nd_pmem",
	.release = nd_region_release,
};

static struct device_type nd_volatile_device_type = {
	.name = "nd_volatile",
	.release = nd_region_release,
};

bool is_nd_pmem(struct device *dev)
{
	return dev ? dev->type == &nd_pmem_device_type : false;
}

bool is_nd_blk(struct device *dev)
{
	return dev ? dev->type == &nd_blk_device_type : false;
}

struct nd_region *to_nd_region(struct device *dev)
{
	struct nd_region *nd_region = container_of(dev, struct nd_region, dev);

	WARN_ON(dev->type->release != nd_region_release);
	return nd_region;
}
EXPORT_SYMBOL_GPL(to_nd_region);

/**
 * nd_region_to_nstype() - region to an integer namespace type
 * @nd_region: region-device to interrogate
 *
 * This is the 'nstype' attribute of a region as well, an input to the
 * MODALIAS for namespace devices, and bit number for a nvdimm_bus to match
 * namespace devices with namespace drivers.
 */
int nd_region_to_nstype(struct nd_region *nd_region)
{
	if (is_nd_pmem(&nd_region->dev)) {
		u16 i, alias;

		for (i = 0, alias = 0; i < nd_region->ndr_mappings; i++) {
			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
			struct nvdimm *nvdimm = nd_mapping->nvdimm;

			if (nvdimm->flags & NDD_ALIASING)
				alias++;
		}
		if (alias)
			return ND_DEVICE_NAMESPACE_PMEM;
		else
			return ND_DEVICE_NAMESPACE_IO;
	} else if (is_nd_blk(&nd_region->dev)) {
		return ND_DEVICE_NAMESPACE_BLK;
	}

	return 0;
}
EXPORT_SYMBOL(nd_region_to_nstype);

static int is_uuid_busy(struct device *dev, void *data)
{
	struct nd_region *nd_region = to_nd_region(dev->parent);
	u8 *uuid = data;

	switch (nd_region_to_nstype(nd_region)) {
	case ND_DEVICE_NAMESPACE_PMEM: {
		struct nd_namespace_pmem *nspm = to_nd_namespace_pmem(dev);

		if (!nspm->uuid)
			break;
		if (memcmp(uuid, nspm->uuid, NSLABEL_UUID_LEN) == 0)
			return -EBUSY;
		break;
	}
	case ND_DEVICE_NAMESPACE_BLK: {
		struct nd_namespace_blk *nsblk = to_nd_namespace_blk(dev);

		if (!nsblk->uuid)
			break;
		if (memcmp(uuid, nsblk->uuid, NSLABEL_UUID_LEN) == 0)
			return -EBUSY;
		break;
	}
	default:
		break;
	}

	return 0;
}

static int is_namespace_uuid_busy(struct device *dev, void *data)
{
	if (is_nd_pmem(dev) || is_nd_blk(dev))
		return device_for_each_child(dev, data, is_uuid_busy);
	return 0;
}

/**
 * nd_is_uuid_unique - verify that no other namespace has @uuid
 * @dev: any device on a nvdimm_bus
 * @uuid: uuid to check
 */
bool nd_is_uuid_unique(struct device *dev, u8 *uuid)
{
	struct nvdimm_bus *nvdimm_bus = walk_to_nvdimm_bus(dev);

	if (!nvdimm_bus)
		return false;
	WARN_ON_ONCE(!is_nvdimm_bus_locked(&nvdimm_bus->dev));
	if (device_for_each_child(&nvdimm_bus->dev, uuid,
				is_namespace_uuid_busy) != 0)
		return false;
	return true;
}

static ssize_t size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	unsigned long long size = 0;

	if (is_nd_pmem(dev)) {
		size = nd_region->ndr_size;
	} else if (nd_region->ndr_mappings == 1) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[0];

		size = nd_mapping->size;
	}

	return sprintf(buf, "%llu\n", size);
}
static DEVICE_ATTR_RO(size);

static ssize_t mappings_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return sprintf(buf, "%d\n", nd_region->ndr_mappings);
}
static DEVICE_ATTR_RO(mappings);

static ssize_t nstype_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);

	return sprintf(buf, "%d\n", nd_region_to_nstype(nd_region));
}
static DEVICE_ATTR_RO(nstype);

static ssize_t set_cookie_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_interleave_set *nd_set = nd_region->nd_set;

	if (is_nd_pmem(dev) && nd_set)
		/* pass, should be precluded by region_visible */;
	else
		return -ENXIO;

	return sprintf(buf, "%#llx\n", nd_set->cookie);
}
static DEVICE_ATTR_RO(set_cookie);

resource_size_t nd_region_available_dpa(struct nd_region *nd_region)
{
	resource_size_t blk_max_overlap = 0, available, overlap;
	int i;

	WARN_ON(!is_nvdimm_bus_locked(&nd_region->dev));

 retry:
	available = 0;
	overlap = blk_max_overlap;
	for (i = 0; i < nd_region->ndr_mappings; i++) {
		struct nd_mapping *nd_mapping = &nd_region->mapping[i];
		struct nvdimm_drvdata *ndd = to_ndd(nd_mapping);

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

		if (is_nd_pmem(&nd_region->dev)) {
			available += nd_pmem_available_dpa(nd_region,
					nd_mapping, &overlap);
			if (overlap > blk_max_overlap) {
				blk_max_overlap = overlap;
				goto retry;
			}
		} else if (is_nd_blk(&nd_region->dev)) {
			available += nd_blk_available_dpa(nd_mapping);
		}
	}

	return available;
}

static ssize_t available_size_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	unsigned long long available = 0;

	/*
	 * Flush in-flight updates and grab a snapshot of the available
	 * size.  Of course, this value is potentially invalidated the
	 * memory nvdimm_bus_lock() is dropped, but that's userspace's
	 * problem to not race itself.
	 */
	nvdimm_bus_lock(dev);
	wait_nvdimm_bus_probe_idle(dev);
	available = nd_region_available_dpa(nd_region);
	nvdimm_bus_unlock(dev);

	return sprintf(buf, "%llu\n", available);
}
static DEVICE_ATTR_RO(available_size);

static ssize_t init_namespaces_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region_namespaces *num_ns = dev_get_drvdata(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (num_ns)
		rc = sprintf(buf, "%d/%d\n", num_ns->active, num_ns->count);
	else
		rc = -ENXIO;
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(init_namespaces);

static ssize_t namespace_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->ns_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->ns_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);
	return rc;
}
static DEVICE_ATTR_RO(namespace_seed);

static ssize_t btt_seed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct nd_region *nd_region = to_nd_region(dev);
	ssize_t rc;

	nvdimm_bus_lock(dev);
	if (nd_region->btt_seed)
		rc = sprintf(buf, "%s\n", dev_name(nd_region->btt_seed));
	else
		rc = sprintf(buf, "\n");
	nvdimm_bus_unlock(dev);

	return rc;
}
static DEVICE_ATTR_RO(btt_seed);

static struct attribute *nd_region_attributes[] = {
	&dev_attr_size.attr,
	&dev_attr_nstype.attr,
	&dev_attr_mappings.attr,
	&dev_attr_btt_seed.attr,
	&dev_attr_set_cookie.attr,
	&dev_attr_available_size.attr,
	&dev_attr_namespace_seed.attr,
	&dev_attr_init_namespaces.attr,
	NULL,
};

static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, typeof(*dev), kobj);
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_interleave_set *nd_set = nd_region->nd_set;
	int type = nd_region_to_nstype(nd_region);

	if (a != &dev_attr_set_cookie.attr
			&& a != &dev_attr_available_size.attr)
		return a->mode;

	if ((type == ND_DEVICE_NAMESPACE_PMEM
				|| type == ND_DEVICE_NAMESPACE_BLK)
			&& a == &dev_attr_available_size.attr)
		return a->mode;
	else if (is_nd_pmem(dev) && nd_set)
		return a->mode;

	return 0;
}

struct attribute_group nd_region_attribute_group = {
	.attrs = nd_region_attributes,
	.is_visible = region_visible,
};
EXPORT_SYMBOL_GPL(nd_region_attribute_group);

u64 nd_region_interleave_set_cookie(struct nd_region *nd_region)
{
	struct nd_interleave_set *nd_set = nd_region->nd_set;

	if (nd_set)
		return nd_set->cookie;
	return 0;
}

/*
 * Upon successful probe/remove, take/release a reference on the
 * associated interleave set (if present), and plant new btt + namespace
 * seeds.
 */
static void nd_region_notify_driver_action(struct nvdimm_bus *nvdimm_bus,
		struct device *dev, bool probe)
{
	struct nd_region *nd_region;

	if (!probe && (is_nd_pmem(dev) || is_nd_blk(dev))) {
		int i;

		nd_region = to_nd_region(dev);
		for (i = 0; i < nd_region->ndr_mappings; i++) {
			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
			struct nvdimm_drvdata *ndd = nd_mapping->ndd;
			struct nvdimm *nvdimm = nd_mapping->nvdimm;

			kfree(nd_mapping->labels);
			nd_mapping->labels = NULL;
			put_ndd(ndd);
			nd_mapping->ndd = NULL;
			atomic_dec(&nvdimm->busy);
		}
	}
	if (dev->parent && is_nd_blk(dev->parent) && probe) {
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->ns_seed == dev)
			nd_region_create_blk_seed(nd_region);
		nvdimm_bus_unlock(dev);
	}
	if (is_nd_btt(dev) && probe) {
		nd_region = to_nd_region(dev->parent);
		nvdimm_bus_lock(dev);
		if (nd_region->btt_seed == dev)
			nd_region_create_btt_seed(nd_region);
		nvdimm_bus_unlock(dev);
	}
}

void nd_region_probe_success(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
	nd_region_notify_driver_action(nvdimm_bus, dev, true);
}

void nd_region_disable(struct nvdimm_bus *nvdimm_bus, struct device *dev)
{
	nd_region_notify_driver_action(nvdimm_bus, dev, false);
}

static ssize_t mappingN(struct device *dev, char *buf, int n)
{
	struct nd_region *nd_region = to_nd_region(dev);
	struct nd_mapping *nd_mapping;
	struct nvdimm *nvdimm;

	if (n >= nd_region->ndr_mappings)
		return -ENXIO;
	nd_mapping = &nd_region->mapping[n];
	nvdimm = nd_mapping->nvdimm;

	return sprintf(buf, "%s,%llu,%llu\n", dev_name(&nvdimm->dev),
			nd_mapping->start, nd_mapping->size);
}

#define REGION_MAPPING(idx) \
static ssize_t mapping##idx##_show(struct device *dev,		\
		struct device_attribute *attr, char *buf)	\
{								\
	return mappingN(dev, buf, idx);				\
}								\
static DEVICE_ATTR_RO(mapping##idx)

/*
 * 32 should be enough for a while, even in the presence of socket
 * interleave a 32-way interleave set is a degenerate case.
 */
REGION_MAPPING(0);
REGION_MAPPING(1);
REGION_MAPPING(2);
REGION_MAPPING(3);
REGION_MAPPING(4);
REGION_MAPPING(5);
REGION_MAPPING(6);
REGION_MAPPING(7);
REGION_MAPPING(8);
REGION_MAPPING(9);
REGION_MAPPING(10);
REGION_MAPPING(11);
REGION_MAPPING(12);
REGION_MAPPING(13);
REGION_MAPPING(14);
REGION_MAPPING(15);
REGION_MAPPING(16);
REGION_MAPPING(17);
REGION_MAPPING(18);
REGION_MAPPING(19);
REGION_MAPPING(20);
REGION_MAPPING(21);
REGION_MAPPING(22);
REGION_MAPPING(23);
REGION_MAPPING(24);
REGION_MAPPING(25);
REGION_MAPPING(26);
REGION_MAPPING(27);
REGION_MAPPING(28);
REGION_MAPPING(29);
REGION_MAPPING(30);
REGION_MAPPING(31);

static umode_t mapping_visible(struct kobject *kobj, struct attribute *a, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nd_region *nd_region = to_nd_region(dev);

	if (n < nd_region->ndr_mappings)
		return a->mode;
	return 0;
}

static struct attribute *mapping_attributes[] = {
	&dev_attr_mapping0.attr,
	&dev_attr_mapping1.attr,
	&dev_attr_mapping2.attr,
	&dev_attr_mapping3.attr,
	&dev_attr_mapping4.attr,
	&dev_attr_mapping5.attr,
	&dev_attr_mapping6.attr,
	&dev_attr_mapping7.attr,
	&dev_attr_mapping8.attr,
	&dev_attr_mapping9.attr,
	&dev_attr_mapping10.attr,
	&dev_attr_mapping11.attr,
	&dev_attr_mapping12.attr,
	&dev_attr_mapping13.attr,
	&dev_attr_mapping14.attr,
	&dev_attr_mapping15.attr,
	&dev_attr_mapping16.attr,
	&dev_attr_mapping17.attr,
	&dev_attr_mapping18.attr,
	&dev_attr_mapping19.attr,
	&dev_attr_mapping20.attr,
	&dev_attr_mapping21.attr,
	&dev_attr_mapping22.attr,
	&dev_attr_mapping23.attr,
	&dev_attr_mapping24.attr,
	&dev_attr_mapping25.attr,
	&dev_attr_mapping26.attr,
	&dev_attr_mapping27.attr,
	&dev_attr_mapping28.attr,
	&dev_attr_mapping29.attr,
	&dev_attr_mapping30.attr,
	&dev_attr_mapping31.attr,
	NULL,
};

struct attribute_group nd_mapping_attribute_group = {
	.is_visible = mapping_visible,
	.attrs = mapping_attributes,
};
EXPORT_SYMBOL_GPL(nd_mapping_attribute_group);

void *nd_region_provider_data(struct nd_region *nd_region)
{
	return nd_region->provider_data;
}
EXPORT_SYMBOL_GPL(nd_region_provider_data);

static struct nd_region *nd_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc, struct device_type *dev_type,
		const char *caller)
{
	struct nd_region *nd_region;
	struct device *dev;
	u16 i;

	for (i = 0; i < ndr_desc->num_mappings; i++) {
		struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		if ((nd_mapping->start | nd_mapping->size) % SZ_4K) {
			dev_err(&nvdimm_bus->dev, "%s: %s mapping%d is not 4K aligned\n",
					caller, dev_name(&nvdimm->dev), i);

			return NULL;
		}
	}

	nd_region = kzalloc(sizeof(struct nd_region)
			+ sizeof(struct nd_mapping) * ndr_desc->num_mappings,
			GFP_KERNEL);
	if (!nd_region)
		return NULL;
	nd_region->id = ida_simple_get(&region_ida, 0, 0, GFP_KERNEL);
	if (nd_region->id < 0) {
		kfree(nd_region);
		return NULL;
	}

	memcpy(nd_region->mapping, ndr_desc->nd_mapping,
			sizeof(struct nd_mapping) * ndr_desc->num_mappings);
	for (i = 0; i < ndr_desc->num_mappings; i++) {
		struct nd_mapping *nd_mapping = &ndr_desc->nd_mapping[i];
		struct nvdimm *nvdimm = nd_mapping->nvdimm;

		get_device(&nvdimm->dev);
	}
	nd_region->ndr_mappings = ndr_desc->num_mappings;
	nd_region->provider_data = ndr_desc->provider_data;
	nd_region->nd_set = ndr_desc->nd_set;
	ida_init(&nd_region->ns_ida);
	ida_init(&nd_region->btt_ida);
	dev = &nd_region->dev;
	dev_set_name(dev, "region%d", nd_region->id);
	dev->parent = &nvdimm_bus->dev;
	dev->type = dev_type;
	dev->groups = ndr_desc->attr_groups;
	nd_region->ndr_size = resource_size(ndr_desc->res);
	nd_region->ndr_start = ndr_desc->res->start;
	nd_device_register(dev);

	return nd_region;
}

struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_pmem_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_pmem_region_create);

struct nd_region *nvdimm_blk_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
	if (ndr_desc->num_mappings > 1)
		return NULL;
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_blk_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_blk_region_create);

struct nd_region *nvdimm_volatile_region_create(struct nvdimm_bus *nvdimm_bus,
		struct nd_region_desc *ndr_desc)
{
	return nd_region_create(nvdimm_bus, ndr_desc, &nd_volatile_device_type,
			__func__);
}
EXPORT_SYMBOL_GPL(nvdimm_volatile_region_create);