summaryrefslogtreecommitdiff
path: root/drivers/lightnvm/pblk-sysfs.c
blob: 620bab853579c884109c95429d6ad1b84f871517 (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
/*
 * Copyright (C) 2016 CNEX Labs
 * Initial release: Javier Gonzalez <javier@cnexlabs.com>
 *                  Matias Bjorling <matias@cnexlabs.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 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.
 *
 * Implementation of a physical block-device target for Open-channel SSDs.
 *
 * pblk-sysfs.c - pblk's sysfs
 *
 */

#include "pblk.h"

static ssize_t pblk_sysfs_luns_show(struct pblk *pblk, char *page)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_lun *rlun;
	ssize_t sz = 0;
	int i;

	for (i = 0; i < geo->all_luns; i++) {
		int active = 1;

		rlun = &pblk->luns[i];
		if (!down_trylock(&rlun->wr_sem)) {
			active = 0;
			up(&rlun->wr_sem);
		}
		sz += snprintf(page + sz, PAGE_SIZE - sz,
				"pblk: pos:%d, ch:%d, lun:%d - %d\n",
					i,
					rlun->bppa.g.ch,
					rlun->bppa.g.lun,
					active);
	}

	return sz;
}

static ssize_t pblk_sysfs_rate_limiter(struct pblk *pblk, char *page)
{
	int free_blocks, free_user_blocks, total_blocks;
	int rb_user_max, rb_user_cnt;
	int rb_gc_max, rb_gc_cnt, rb_budget, rb_state;

	free_blocks = pblk_rl_nr_free_blks(&pblk->rl);
	free_user_blocks = pblk_rl_nr_user_free_blks(&pblk->rl);
	rb_user_max = pblk->rl.rb_user_max;
	rb_user_cnt = atomic_read(&pblk->rl.rb_user_cnt);
	rb_gc_max = pblk->rl.rb_gc_max;
	rb_gc_cnt = atomic_read(&pblk->rl.rb_gc_cnt);
	rb_budget = pblk->rl.rb_budget;
	rb_state = pblk->rl.rb_state;

	total_blocks = pblk->rl.total_blocks;

	return snprintf(page, PAGE_SIZE,
		"u:%u/%u,gc:%u/%u(%u)(stop:<%u,full:>%u,free:%d/%d/%d)-%d\n",
				rb_user_cnt,
				rb_user_max,
				rb_gc_cnt,
				rb_gc_max,
				rb_state,
				rb_budget,
				pblk->rl.high,
				free_blocks,
				free_user_blocks,
				total_blocks,
				READ_ONCE(pblk->rl.rb_user_active));
}

static ssize_t pblk_sysfs_gc_state_show(struct pblk *pblk, char *page)
{
	int gc_enabled, gc_active;

	pblk_gc_sysfs_state_show(pblk, &gc_enabled, &gc_active);
	return snprintf(page, PAGE_SIZE, "gc_enabled=%d, gc_active=%d\n",
					gc_enabled, gc_active);
}

static ssize_t pblk_sysfs_stats(struct pblk *pblk, char *page)
{
	ssize_t sz;

	sz = snprintf(page, PAGE_SIZE,
			"read_failed=%lu, read_high_ecc=%lu, read_empty=%lu, read_failed_gc=%lu, write_failed=%lu, erase_failed=%lu\n",
			atomic_long_read(&pblk->read_failed),
			atomic_long_read(&pblk->read_high_ecc),
			atomic_long_read(&pblk->read_empty),
			atomic_long_read(&pblk->read_failed_gc),
			atomic_long_read(&pblk->write_failed),
			atomic_long_read(&pblk->erase_failed));

	return sz;
}

static ssize_t pblk_sysfs_write_buffer(struct pblk *pblk, char *page)
{
	return pblk_rb_sysfs(&pblk->rwb, page);
}

static ssize_t pblk_sysfs_ppaf(struct pblk *pblk, char *page)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	ssize_t sz = 0;

	sz = snprintf(page, PAGE_SIZE - sz,
		"g:(b:%d)blk:%d/%d,pg:%d/%d,lun:%d/%d,ch:%d/%d,pl:%d/%d,sec:%d/%d\n",
		pblk->ppaf_bitsize,
		pblk->ppaf.blk_offset, geo->ppaf.blk_len,
		pblk->ppaf.pg_offset, geo->ppaf.pg_len,
		pblk->ppaf.lun_offset, geo->ppaf.lun_len,
		pblk->ppaf.ch_offset, geo->ppaf.ch_len,
		pblk->ppaf.pln_offset, geo->ppaf.pln_len,
		pblk->ppaf.sec_offset, geo->ppaf.sect_len);

	sz += snprintf(page + sz, PAGE_SIZE - sz,
		"d:blk:%d/%d,pg:%d/%d,lun:%d/%d,ch:%d/%d,pl:%d/%d,sec:%d/%d\n",
		geo->ppaf.blk_offset, geo->ppaf.blk_len,
		geo->ppaf.pg_offset, geo->ppaf.pg_len,
		geo->ppaf.lun_offset, geo->ppaf.lun_len,
		geo->ppaf.ch_offset, geo->ppaf.ch_len,
		geo->ppaf.pln_offset, geo->ppaf.pln_len,
		geo->ppaf.sect_offset, geo->ppaf.sect_len);

	return sz;
}

static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
	struct pblk_line *line;
	ssize_t sz = 0;
	int nr_free_lines;
	int cur_data, cur_log;
	int free_line_cnt = 0, closed_line_cnt = 0, emeta_line_cnt = 0;
	int d_line_cnt = 0, l_line_cnt = 0;
	int gc_full = 0, gc_high = 0, gc_mid = 0, gc_low = 0, gc_empty = 0;
	int bad = 0, cor = 0;
	int msecs = 0, cur_sec = 0, vsc = 0, sec_in_line = 0;
	int map_weight = 0, meta_weight = 0;

	spin_lock(&l_mg->free_lock);
	cur_data = (l_mg->data_line) ? l_mg->data_line->id : -1;
	cur_log = (l_mg->log_line) ? l_mg->log_line->id : -1;
	nr_free_lines = l_mg->nr_free_lines;

	list_for_each_entry(line, &l_mg->free_list, list)
		free_line_cnt++;
	spin_unlock(&l_mg->free_lock);

	spin_lock(&l_mg->close_lock);
	list_for_each_entry(line, &l_mg->emeta_list, list)
		emeta_line_cnt++;
	spin_unlock(&l_mg->close_lock);

	spin_lock(&l_mg->gc_lock);
	list_for_each_entry(line, &l_mg->gc_full_list, list) {
		if (line->type == PBLK_LINETYPE_DATA)
			d_line_cnt++;
		else if (line->type == PBLK_LINETYPE_LOG)
			l_line_cnt++;
		closed_line_cnt++;
		gc_full++;
	}

	list_for_each_entry(line, &l_mg->gc_high_list, list) {
		if (line->type == PBLK_LINETYPE_DATA)
			d_line_cnt++;
		else if (line->type == PBLK_LINETYPE_LOG)
			l_line_cnt++;
		closed_line_cnt++;
		gc_high++;
	}

	list_for_each_entry(line, &l_mg->gc_mid_list, list) {
		if (line->type == PBLK_LINETYPE_DATA)
			d_line_cnt++;
		else if (line->type == PBLK_LINETYPE_LOG)
			l_line_cnt++;
		closed_line_cnt++;
		gc_mid++;
	}

	list_for_each_entry(line, &l_mg->gc_low_list, list) {
		if (line->type == PBLK_LINETYPE_DATA)
			d_line_cnt++;
		else if (line->type == PBLK_LINETYPE_LOG)
			l_line_cnt++;
		closed_line_cnt++;
		gc_low++;
	}

	list_for_each_entry(line, &l_mg->gc_empty_list, list) {
		if (line->type == PBLK_LINETYPE_DATA)
			d_line_cnt++;
		else if (line->type == PBLK_LINETYPE_LOG)
			l_line_cnt++;
		closed_line_cnt++;
		gc_empty++;
	}

	list_for_each_entry(line, &l_mg->bad_list, list)
		bad++;
	list_for_each_entry(line, &l_mg->corrupt_list, list)
		cor++;
	spin_unlock(&l_mg->gc_lock);

	spin_lock(&l_mg->free_lock);
	if (l_mg->data_line) {
		cur_sec = l_mg->data_line->cur_sec;
		msecs = l_mg->data_line->left_msecs;
		vsc = le32_to_cpu(*l_mg->data_line->vsc);
		sec_in_line = l_mg->data_line->sec_in_line;
		meta_weight = bitmap_weight(&l_mg->meta_bitmap,
							PBLK_DATA_LINES);
		map_weight = bitmap_weight(l_mg->data_line->map_bitmap,
							lm->sec_per_line);
	}
	spin_unlock(&l_mg->free_lock);

	if (nr_free_lines != free_line_cnt)
		pr_err("pblk: corrupted free line list:%d/%d\n",
						nr_free_lines, free_line_cnt);

	sz = snprintf(page, PAGE_SIZE - sz,
		"line: nluns:%d, nblks:%d, nsecs:%d\n",
		geo->all_luns, lm->blk_per_line, lm->sec_per_line);

	sz += snprintf(page + sz, PAGE_SIZE - sz,
		"lines:d:%d,l:%d-f:%d,m:%d/%d,c:%d,b:%d,co:%d(d:%d,l:%d)t:%d\n",
					cur_data, cur_log,
					nr_free_lines,
					emeta_line_cnt, meta_weight,
					closed_line_cnt,
					bad, cor,
					d_line_cnt, l_line_cnt,
					l_mg->nr_lines);

	sz += snprintf(page + sz, PAGE_SIZE - sz,
		"GC: full:%d, high:%d, mid:%d, low:%d, empty:%d, queue:%d\n",
			gc_full, gc_high, gc_mid, gc_low, gc_empty,
			atomic_read(&pblk->gc.read_inflight_gc));

	sz += snprintf(page + sz, PAGE_SIZE - sz,
		"data (%d) cur:%d, left:%d, vsc:%d, s:%d, map:%d/%d (%d)\n",
			cur_data, cur_sec, msecs, vsc, sec_in_line,
			map_weight, lm->sec_per_line,
			atomic_read(&pblk->inflight_io));

	return sz;
}

static ssize_t pblk_sysfs_lines_info(struct pblk *pblk, char *page)
{
	struct nvm_tgt_dev *dev = pblk->dev;
	struct nvm_geo *geo = &dev->geo;
	struct pblk_line_meta *lm = &pblk->lm;
	ssize_t sz = 0;

	sz = snprintf(page, PAGE_SIZE - sz,
				"smeta - len:%d, secs:%d\n",
					lm->smeta_len, lm->smeta_sec);
	sz += snprintf(page + sz, PAGE_SIZE - sz,
				"emeta - len:%d, sec:%d, bb_start:%d\n",
					lm->emeta_len[0], lm->emeta_sec[0],
					lm->emeta_bb);
	sz += snprintf(page + sz, PAGE_SIZE - sz,
				"bitmap lengths: sec:%d, blk:%d, lun:%d\n",
					lm->sec_bitmap_len,
					lm->blk_bitmap_len,
					lm->lun_bitmap_len);
	sz += snprintf(page + sz, PAGE_SIZE - sz,
				"blk_line:%d, sec_line:%d, sec_blk:%d\n",
					lm->blk_per_line,
					lm->sec_per_line,
					geo->sec_per_chk);

	return sz;
}

static ssize_t pblk_sysfs_get_sec_per_write(struct pblk *pblk, char *page)
{
	return snprintf(page, PAGE_SIZE, "%d\n", pblk->sec_per_write);
}

#ifdef CONFIG_NVM_DEBUG
static ssize_t pblk_sysfs_stats_debug(struct pblk *pblk, char *page)
{
	return snprintf(page, PAGE_SIZE,
		"%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\t%lu\n",
			atomic_long_read(&pblk->inflight_writes),
			atomic_long_read(&pblk->inflight_reads),
			atomic_long_read(&pblk->req_writes),
			atomic_long_read(&pblk->nr_flush),
			atomic_long_read(&pblk->padded_writes),
			atomic_long_read(&pblk->padded_wb),
			atomic_long_read(&pblk->sub_writes),
			atomic_long_read(&pblk->sync_writes),
			atomic_long_read(&pblk->recov_writes),
			atomic_long_read(&pblk->recov_gc_writes),
			atomic_long_read(&pblk->recov_gc_reads),
			atomic_long_read(&pblk->cache_reads),
			atomic_long_read(&pblk->sync_reads));
}
#endif

static ssize_t pblk_sysfs_gc_force(struct pblk *pblk, const char *page,
				   size_t len)
{
	size_t c_len;
	int force;

	c_len = strcspn(page, "\n");
	if (c_len >= len)
		return -EINVAL;

	if (kstrtouint(page, 0, &force))
		return -EINVAL;

	pblk_gc_sysfs_force(pblk, force);

	return len;
}

static ssize_t pblk_sysfs_set_sec_per_write(struct pblk *pblk,
					     const char *page, size_t len)
{
	size_t c_len;
	int sec_per_write;

	c_len = strcspn(page, "\n");
	if (c_len >= len)
		return -EINVAL;

	if (kstrtouint(page, 0, &sec_per_write))
		return -EINVAL;

	if (sec_per_write < pblk->min_write_pgs
				|| sec_per_write > pblk->max_write_pgs
				|| sec_per_write % pblk->min_write_pgs != 0)
		return -EINVAL;

	pblk_set_sec_per_write(pblk, sec_per_write);

	return len;
}

static struct attribute sys_write_luns = {
	.name = "write_luns",
	.mode = 0444,
};

static struct attribute sys_rate_limiter_attr = {
	.name = "rate_limiter",
	.mode = 0444,
};

static struct attribute sys_gc_state = {
	.name = "gc_state",
	.mode = 0444,
};

static struct attribute sys_errors_attr = {
	.name = "errors",
	.mode = 0444,
};

static struct attribute sys_rb_attr = {
	.name = "write_buffer",
	.mode = 0444,
};

static struct attribute sys_stats_ppaf_attr = {
	.name = "ppa_format",
	.mode = 0444,
};

static struct attribute sys_lines_attr = {
	.name = "lines",
	.mode = 0444,
};

static struct attribute sys_lines_info_attr = {
	.name = "lines_info",
	.mode = 0444,
};

static struct attribute sys_gc_force = {
	.name = "gc_force",
	.mode = 0200,
};

static struct attribute sys_max_sec_per_write = {
	.name = "max_sec_per_write",
	.mode = 0644,
};

#ifdef CONFIG_NVM_DEBUG
static struct attribute sys_stats_debug_attr = {
	.name = "stats",
	.mode = 0444,
};
#endif

static struct attribute *pblk_attrs[] = {
	&sys_write_luns,
	&sys_rate_limiter_attr,
	&sys_errors_attr,
	&sys_gc_state,
	&sys_gc_force,
	&sys_max_sec_per_write,
	&sys_rb_attr,
	&sys_stats_ppaf_attr,
	&sys_lines_attr,
	&sys_lines_info_attr,
#ifdef CONFIG_NVM_DEBUG
	&sys_stats_debug_attr,
#endif
	NULL,
};

static ssize_t pblk_sysfs_show(struct kobject *kobj, struct attribute *attr,
			       char *buf)
{
	struct pblk *pblk = container_of(kobj, struct pblk, kobj);

	if (strcmp(attr->name, "rate_limiter") == 0)
		return pblk_sysfs_rate_limiter(pblk, buf);
	else if (strcmp(attr->name, "write_luns") == 0)
		return pblk_sysfs_luns_show(pblk, buf);
	else if (strcmp(attr->name, "gc_state") == 0)
		return pblk_sysfs_gc_state_show(pblk, buf);
	else if (strcmp(attr->name, "errors") == 0)
		return pblk_sysfs_stats(pblk, buf);
	else if (strcmp(attr->name, "write_buffer") == 0)
		return pblk_sysfs_write_buffer(pblk, buf);
	else if (strcmp(attr->name, "ppa_format") == 0)
		return pblk_sysfs_ppaf(pblk, buf);
	else if (strcmp(attr->name, "lines") == 0)
		return pblk_sysfs_lines(pblk, buf);
	else if (strcmp(attr->name, "lines_info") == 0)
		return pblk_sysfs_lines_info(pblk, buf);
	else if (strcmp(attr->name, "max_sec_per_write") == 0)
		return pblk_sysfs_get_sec_per_write(pblk, buf);
#ifdef CONFIG_NVM_DEBUG
	else if (strcmp(attr->name, "stats") == 0)
		return pblk_sysfs_stats_debug(pblk, buf);
#endif
	return 0;
}

static ssize_t pblk_sysfs_store(struct kobject *kobj, struct attribute *attr,
				const char *buf, size_t len)
{
	struct pblk *pblk = container_of(kobj, struct pblk, kobj);

	if (strcmp(attr->name, "gc_force") == 0)
		return pblk_sysfs_gc_force(pblk, buf, len);
	else if (strcmp(attr->name, "max_sec_per_write") == 0)
		return pblk_sysfs_set_sec_per_write(pblk, buf, len);

	return 0;
}

static const struct sysfs_ops pblk_sysfs_ops = {
	.show = pblk_sysfs_show,
	.store = pblk_sysfs_store,
};

static struct kobj_type pblk_ktype = {
	.sysfs_ops	= &pblk_sysfs_ops,
	.default_attrs	= pblk_attrs,
};

int pblk_sysfs_init(struct gendisk *tdisk)
{
	struct pblk *pblk = tdisk->private_data;
	struct device *parent_dev = disk_to_dev(pblk->disk);
	int ret;

	ret = kobject_init_and_add(&pblk->kobj, &pblk_ktype,
					kobject_get(&parent_dev->kobj),
					"%s", "pblk");
	if (ret) {
		pr_err("pblk: could not register %s/pblk\n",
						tdisk->disk_name);
		return ret;
	}

	kobject_uevent(&pblk->kobj, KOBJ_ADD);
	return 0;
}

void pblk_sysfs_exit(struct gendisk *tdisk)
{
	struct pblk *pblk = tdisk->private_data;

	kobject_uevent(&pblk->kobj, KOBJ_REMOVE);
	kobject_del(&pblk->kobj);
	kobject_put(&pblk->kobj);
}