1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Functions related to sysfs handling
4 */
5 #include <linux/kernel.h>
6 #include <linux/slab.h>
7 #include <linux/module.h>
8 #include <linux/bio.h>
9 #include <linux/blkdev.h>
10 #include <linux/backing-dev.h>
11 #include <linux/blktrace_api.h>
12 #include <linux/debugfs.h>
13
14 #include "blk.h"
15 #include "blk-mq.h"
16 #include "blk-mq-debugfs.h"
17 #include "blk-mq-sched.h"
18 #include "blk-rq-qos.h"
19 #include "blk-wbt.h"
20 #include "blk-cgroup.h"
21 #include "blk-throttle.h"
22
23 struct queue_sysfs_entry {
24 struct attribute attr;
25 ssize_t (*show)(struct request_queue *, char *);
26 ssize_t (*store)(struct request_queue *, const char *, size_t);
27 };
28
29 static ssize_t
queue_var_show(unsigned long var,char * page)30 queue_var_show(unsigned long var, char *page)
31 {
32 return sprintf(page, "%lu\n", var);
33 }
34
35 static ssize_t
queue_var_store(unsigned long * var,const char * page,size_t count)36 queue_var_store(unsigned long *var, const char *page, size_t count)
37 {
38 int err;
39 unsigned long v;
40
41 err = kstrtoul(page, 10, &v);
42 if (err || v > UINT_MAX)
43 return -EINVAL;
44
45 *var = v;
46
47 return count;
48 }
49
queue_requests_show(struct request_queue * q,char * page)50 static ssize_t queue_requests_show(struct request_queue *q, char *page)
51 {
52 return queue_var_show(q->nr_requests, page);
53 }
54
55 static ssize_t
queue_requests_store(struct request_queue * q,const char * page,size_t count)56 queue_requests_store(struct request_queue *q, const char *page, size_t count)
57 {
58 unsigned long nr;
59 int ret, err;
60
61 if (!queue_is_mq(q))
62 return -EINVAL;
63
64 ret = queue_var_store(&nr, page, count);
65 if (ret < 0)
66 return ret;
67
68 if (nr < BLKDEV_MIN_RQ)
69 nr = BLKDEV_MIN_RQ;
70
71 err = blk_mq_update_nr_requests(q, nr);
72 if (err)
73 return err;
74
75 return ret;
76 }
77
queue_ra_show(struct request_queue * q,char * page)78 static ssize_t queue_ra_show(struct request_queue *q, char *page)
79 {
80 unsigned long ra_kb;
81
82 if (!q->disk)
83 return -EINVAL;
84 ra_kb = q->disk->bdi->ra_pages << (PAGE_SHIFT - 10);
85 return queue_var_show(ra_kb, page);
86 }
87
88 static ssize_t
queue_ra_store(struct request_queue * q,const char * page,size_t count)89 queue_ra_store(struct request_queue *q, const char *page, size_t count)
90 {
91 unsigned long ra_kb;
92 ssize_t ret;
93
94 if (!q->disk)
95 return -EINVAL;
96 ret = queue_var_store(&ra_kb, page, count);
97 if (ret < 0)
98 return ret;
99 q->disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10);
100 return ret;
101 }
102
queue_max_sectors_show(struct request_queue * q,char * page)103 static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
104 {
105 int max_sectors_kb = queue_max_sectors(q) >> 1;
106
107 return queue_var_show(max_sectors_kb, page);
108 }
109
queue_max_segments_show(struct request_queue * q,char * page)110 static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
111 {
112 return queue_var_show(queue_max_segments(q), page);
113 }
114
queue_max_discard_segments_show(struct request_queue * q,char * page)115 static ssize_t queue_max_discard_segments_show(struct request_queue *q,
116 char *page)
117 {
118 return queue_var_show(queue_max_discard_segments(q), page);
119 }
120
queue_max_integrity_segments_show(struct request_queue * q,char * page)121 static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
122 {
123 return queue_var_show(q->limits.max_integrity_segments, page);
124 }
125
queue_max_segment_size_show(struct request_queue * q,char * page)126 static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
127 {
128 return queue_var_show(queue_max_segment_size(q), page);
129 }
130
queue_logical_block_size_show(struct request_queue * q,char * page)131 static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
132 {
133 return queue_var_show(queue_logical_block_size(q), page);
134 }
135
queue_physical_block_size_show(struct request_queue * q,char * page)136 static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
137 {
138 return queue_var_show(queue_physical_block_size(q), page);
139 }
140
queue_chunk_sectors_show(struct request_queue * q,char * page)141 static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
142 {
143 return queue_var_show(q->limits.chunk_sectors, page);
144 }
145
queue_io_min_show(struct request_queue * q,char * page)146 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
147 {
148 return queue_var_show(queue_io_min(q), page);
149 }
150
queue_io_opt_show(struct request_queue * q,char * page)151 static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
152 {
153 return queue_var_show(queue_io_opt(q), page);
154 }
155
queue_discard_granularity_show(struct request_queue * q,char * page)156 static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
157 {
158 return queue_var_show(q->limits.discard_granularity, page);
159 }
160
queue_discard_max_hw_show(struct request_queue * q,char * page)161 static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page)
162 {
163
164 return sprintf(page, "%llu\n",
165 (unsigned long long)q->limits.max_hw_discard_sectors << 9);
166 }
167
queue_discard_max_show(struct request_queue * q,char * page)168 static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
169 {
170 return sprintf(page, "%llu\n",
171 (unsigned long long)q->limits.max_discard_sectors << 9);
172 }
173
queue_discard_max_store(struct request_queue * q,const char * page,size_t count)174 static ssize_t queue_discard_max_store(struct request_queue *q,
175 const char *page, size_t count)
176 {
177 unsigned long max_discard_bytes;
178 struct queue_limits lim;
179 ssize_t ret;
180 int err;
181
182 ret = queue_var_store(&max_discard_bytes, page, count);
183 if (ret < 0)
184 return ret;
185
186 if (max_discard_bytes & (q->limits.discard_granularity - 1))
187 return -EINVAL;
188
189 if ((max_discard_bytes >> SECTOR_SHIFT) > UINT_MAX)
190 return -EINVAL;
191
192 blk_mq_freeze_queue(q);
193 lim = queue_limits_start_update(q);
194 lim.max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT;
195 err = queue_limits_commit_update(q, &lim);
196 blk_mq_unfreeze_queue(q);
197
198 if (err)
199 return err;
200 return ret;
201 }
202
queue_discard_zeroes_data_show(struct request_queue * q,char * page)203 static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
204 {
205 return queue_var_show(0, page);
206 }
207
queue_write_same_max_show(struct request_queue * q,char * page)208 static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
209 {
210 return queue_var_show(0, page);
211 }
212
queue_write_zeroes_max_show(struct request_queue * q,char * page)213 static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page)
214 {
215 return sprintf(page, "%llu\n",
216 (unsigned long long)q->limits.max_write_zeroes_sectors << 9);
217 }
218
queue_zone_write_granularity_show(struct request_queue * q,char * page)219 static ssize_t queue_zone_write_granularity_show(struct request_queue *q,
220 char *page)
221 {
222 return queue_var_show(queue_zone_write_granularity(q), page);
223 }
224
queue_zone_append_max_show(struct request_queue * q,char * page)225 static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page)
226 {
227 unsigned long long max_sectors = queue_max_zone_append_sectors(q);
228
229 return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT);
230 }
231
232 static ssize_t
queue_max_sectors_store(struct request_queue * q,const char * page,size_t count)233 queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
234 {
235 unsigned long max_sectors_kb;
236 struct queue_limits lim;
237 ssize_t ret;
238 int err;
239
240 ret = queue_var_store(&max_sectors_kb, page, count);
241 if (ret < 0)
242 return ret;
243
244 blk_mq_freeze_queue(q);
245 lim = queue_limits_start_update(q);
246 lim.max_user_sectors = max_sectors_kb << 1;
247 err = queue_limits_commit_update(q, &lim);
248 blk_mq_unfreeze_queue(q);
249 if (err)
250 return err;
251 return ret;
252 }
253
queue_max_hw_sectors_show(struct request_queue * q,char * page)254 static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
255 {
256 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
257
258 return queue_var_show(max_hw_sectors_kb, page);
259 }
260
queue_virt_boundary_mask_show(struct request_queue * q,char * page)261 static ssize_t queue_virt_boundary_mask_show(struct request_queue *q, char *page)
262 {
263 return queue_var_show(q->limits.virt_boundary_mask, page);
264 }
265
queue_dma_alignment_show(struct request_queue * q,char * page)266 static ssize_t queue_dma_alignment_show(struct request_queue *q, char *page)
267 {
268 return queue_var_show(queue_dma_alignment(q), page);
269 }
270
271 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
272 static ssize_t \
273 queue_##name##_show(struct request_queue *q, char *page) \
274 { \
275 int bit; \
276 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
277 return queue_var_show(neg ? !bit : bit, page); \
278 } \
279 static ssize_t \
280 queue_##name##_store(struct request_queue *q, const char *page, size_t count) \
281 { \
282 unsigned long val; \
283 ssize_t ret; \
284 ret = queue_var_store(&val, page, count); \
285 if (ret < 0) \
286 return ret; \
287 if (neg) \
288 val = !val; \
289 \
290 if (val) \
291 blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
292 else \
293 blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
294 return ret; \
295 }
296
297 QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
298 QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
299 QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
300 QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0);
301 #undef QUEUE_SYSFS_BIT_FNS
302
queue_zoned_show(struct request_queue * q,char * page)303 static ssize_t queue_zoned_show(struct request_queue *q, char *page)
304 {
305 if (blk_queue_is_zoned(q))
306 return sprintf(page, "host-managed\n");
307 return sprintf(page, "none\n");
308 }
309
queue_nr_zones_show(struct request_queue * q,char * page)310 static ssize_t queue_nr_zones_show(struct request_queue *q, char *page)
311 {
312 return queue_var_show(disk_nr_zones(q->disk), page);
313 }
314
queue_max_open_zones_show(struct request_queue * q,char * page)315 static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page)
316 {
317 return queue_var_show(bdev_max_open_zones(q->disk->part0), page);
318 }
319
queue_max_active_zones_show(struct request_queue * q,char * page)320 static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page)
321 {
322 return queue_var_show(bdev_max_active_zones(q->disk->part0), page);
323 }
324
queue_nomerges_show(struct request_queue * q,char * page)325 static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
326 {
327 return queue_var_show((blk_queue_nomerges(q) << 1) |
328 blk_queue_noxmerges(q), page);
329 }
330
queue_nomerges_store(struct request_queue * q,const char * page,size_t count)331 static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
332 size_t count)
333 {
334 unsigned long nm;
335 ssize_t ret = queue_var_store(&nm, page, count);
336
337 if (ret < 0)
338 return ret;
339
340 blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
341 blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
342 if (nm == 2)
343 blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q);
344 else if (nm)
345 blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
346
347 return ret;
348 }
349
queue_rq_affinity_show(struct request_queue * q,char * page)350 static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
351 {
352 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
353 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
354
355 return queue_var_show(set << force, page);
356 }
357
358 static ssize_t
queue_rq_affinity_store(struct request_queue * q,const char * page,size_t count)359 queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
360 {
361 ssize_t ret = -EINVAL;
362 #ifdef CONFIG_SMP
363 unsigned long val;
364
365 ret = queue_var_store(&val, page, count);
366 if (ret < 0)
367 return ret;
368
369 if (val == 2) {
370 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
371 blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
372 } else if (val == 1) {
373 blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
374 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
375 } else if (val == 0) {
376 blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
377 blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
378 }
379 #endif
380 return ret;
381 }
382
queue_poll_delay_show(struct request_queue * q,char * page)383 static ssize_t queue_poll_delay_show(struct request_queue *q, char *page)
384 {
385 return sprintf(page, "%d\n", -1);
386 }
387
queue_poll_delay_store(struct request_queue * q,const char * page,size_t count)388 static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page,
389 size_t count)
390 {
391 return count;
392 }
393
queue_poll_show(struct request_queue * q,char * page)394 static ssize_t queue_poll_show(struct request_queue *q, char *page)
395 {
396 return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page);
397 }
398
queue_poll_store(struct request_queue * q,const char * page,size_t count)399 static ssize_t queue_poll_store(struct request_queue *q, const char *page,
400 size_t count)
401 {
402 if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
403 return -EINVAL;
404 pr_info_ratelimited("writes to the poll attribute are ignored.\n");
405 pr_info_ratelimited("please use driver specific parameters instead.\n");
406 return count;
407 }
408
queue_io_timeout_show(struct request_queue * q,char * page)409 static ssize_t queue_io_timeout_show(struct request_queue *q, char *page)
410 {
411 return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout));
412 }
413
queue_io_timeout_store(struct request_queue * q,const char * page,size_t count)414 static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page,
415 size_t count)
416 {
417 unsigned int val;
418 int err;
419
420 err = kstrtou32(page, 10, &val);
421 if (err || val == 0)
422 return -EINVAL;
423
424 blk_queue_rq_timeout(q, msecs_to_jiffies(val));
425
426 return count;
427 }
428
queue_wc_show(struct request_queue * q,char * page)429 static ssize_t queue_wc_show(struct request_queue *q, char *page)
430 {
431 if (test_bit(QUEUE_FLAG_WC, &q->queue_flags))
432 return sprintf(page, "write back\n");
433
434 return sprintf(page, "write through\n");
435 }
436
queue_wc_store(struct request_queue * q,const char * page,size_t count)437 static ssize_t queue_wc_store(struct request_queue *q, const char *page,
438 size_t count)
439 {
440 if (!strncmp(page, "write back", 10)) {
441 if (!test_bit(QUEUE_FLAG_HW_WC, &q->queue_flags))
442 return -EINVAL;
443 blk_queue_flag_set(QUEUE_FLAG_WC, q);
444 } else if (!strncmp(page, "write through", 13) ||
445 !strncmp(page, "none", 4)) {
446 blk_queue_flag_clear(QUEUE_FLAG_WC, q);
447 } else {
448 return -EINVAL;
449 }
450
451 return count;
452 }
453
queue_fua_show(struct request_queue * q,char * page)454 static ssize_t queue_fua_show(struct request_queue *q, char *page)
455 {
456 return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags));
457 }
458
queue_dax_show(struct request_queue * q,char * page)459 static ssize_t queue_dax_show(struct request_queue *q, char *page)
460 {
461 return queue_var_show(blk_queue_dax(q), page);
462 }
463
464 #define QUEUE_RO_ENTRY(_prefix, _name) \
465 static struct queue_sysfs_entry _prefix##_entry = { \
466 .attr = { .name = _name, .mode = 0444 }, \
467 .show = _prefix##_show, \
468 };
469
470 #define QUEUE_RW_ENTRY(_prefix, _name) \
471 static struct queue_sysfs_entry _prefix##_entry = { \
472 .attr = { .name = _name, .mode = 0644 }, \
473 .show = _prefix##_show, \
474 .store = _prefix##_store, \
475 };
476
477 QUEUE_RW_ENTRY(queue_requests, "nr_requests");
478 QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb");
479 QUEUE_RW_ENTRY(queue_max_sectors, "max_sectors_kb");
480 QUEUE_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb");
481 QUEUE_RO_ENTRY(queue_max_segments, "max_segments");
482 QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments");
483 QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size");
484 QUEUE_RW_ENTRY(elv_iosched, "scheduler");
485
486 QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size");
487 QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size");
488 QUEUE_RO_ENTRY(queue_chunk_sectors, "chunk_sectors");
489 QUEUE_RO_ENTRY(queue_io_min, "minimum_io_size");
490 QUEUE_RO_ENTRY(queue_io_opt, "optimal_io_size");
491
492 QUEUE_RO_ENTRY(queue_max_discard_segments, "max_discard_segments");
493 QUEUE_RO_ENTRY(queue_discard_granularity, "discard_granularity");
494 QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes");
495 QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes");
496 QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data");
497
498 QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes");
499 QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes");
500 QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes");
501 QUEUE_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity");
502
503 QUEUE_RO_ENTRY(queue_zoned, "zoned");
504 QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones");
505 QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones");
506 QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones");
507
508 QUEUE_RW_ENTRY(queue_nomerges, "nomerges");
509 QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity");
510 QUEUE_RW_ENTRY(queue_poll, "io_poll");
511 QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay");
512 QUEUE_RW_ENTRY(queue_wc, "write_cache");
513 QUEUE_RO_ENTRY(queue_fua, "fua");
514 QUEUE_RO_ENTRY(queue_dax, "dax");
515 QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
516 QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
517 QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment");
518
519 /* legacy alias for logical_block_size: */
520 static struct queue_sysfs_entry queue_hw_sector_size_entry = {
521 .attr = {.name = "hw_sector_size", .mode = 0444 },
522 .show = queue_logical_block_size_show,
523 };
524
525 QUEUE_RW_ENTRY(queue_nonrot, "rotational");
526 QUEUE_RW_ENTRY(queue_iostats, "iostats");
527 QUEUE_RW_ENTRY(queue_random, "add_random");
528 QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes");
529
530 #ifdef CONFIG_BLK_WBT
queue_var_store64(s64 * var,const char * page)531 static ssize_t queue_var_store64(s64 *var, const char *page)
532 {
533 int err;
534 s64 v;
535
536 err = kstrtos64(page, 10, &v);
537 if (err < 0)
538 return err;
539
540 *var = v;
541 return 0;
542 }
543
queue_wb_lat_show(struct request_queue * q,char * page)544 static ssize_t queue_wb_lat_show(struct request_queue *q, char *page)
545 {
546 if (!wbt_rq_qos(q))
547 return -EINVAL;
548
549 if (wbt_disabled(q))
550 return sprintf(page, "0\n");
551
552 return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000));
553 }
554
queue_wb_lat_store(struct request_queue * q,const char * page,size_t count)555 static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page,
556 size_t count)
557 {
558 struct rq_qos *rqos;
559 ssize_t ret;
560 s64 val;
561
562 ret = queue_var_store64(&val, page);
563 if (ret < 0)
564 return ret;
565 if (val < -1)
566 return -EINVAL;
567
568 rqos = wbt_rq_qos(q);
569 if (!rqos) {
570 ret = wbt_init(q->disk);
571 if (ret)
572 return ret;
573 }
574
575 if (val == -1)
576 val = wbt_default_latency_nsec(q);
577 else if (val >= 0)
578 val *= 1000ULL;
579
580 if (wbt_get_min_lat(q) == val)
581 return count;
582
583 /*
584 * Ensure that the queue is idled, in case the latency update
585 * ends up either enabling or disabling wbt completely. We can't
586 * have IO inflight if that happens.
587 */
588 blk_mq_freeze_queue(q);
589 blk_mq_quiesce_queue(q);
590
591 wbt_set_min_lat(q, val);
592
593 blk_mq_unquiesce_queue(q);
594 blk_mq_unfreeze_queue(q);
595
596 return count;
597 }
598
599 QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
600 #endif
601
602 /* Common attributes for bio-based and request-based queues. */
603 static struct attribute *queue_attrs[] = {
604 &queue_ra_entry.attr,
605 &queue_max_hw_sectors_entry.attr,
606 &queue_max_sectors_entry.attr,
607 &queue_max_segments_entry.attr,
608 &queue_max_discard_segments_entry.attr,
609 &queue_max_integrity_segments_entry.attr,
610 &queue_max_segment_size_entry.attr,
611 &queue_hw_sector_size_entry.attr,
612 &queue_logical_block_size_entry.attr,
613 &queue_physical_block_size_entry.attr,
614 &queue_chunk_sectors_entry.attr,
615 &queue_io_min_entry.attr,
616 &queue_io_opt_entry.attr,
617 &queue_discard_granularity_entry.attr,
618 &queue_discard_max_entry.attr,
619 &queue_discard_max_hw_entry.attr,
620 &queue_discard_zeroes_data_entry.attr,
621 &queue_write_same_max_entry.attr,
622 &queue_write_zeroes_max_entry.attr,
623 &queue_zone_append_max_entry.attr,
624 &queue_zone_write_granularity_entry.attr,
625 &queue_nonrot_entry.attr,
626 &queue_zoned_entry.attr,
627 &queue_nr_zones_entry.attr,
628 &queue_max_open_zones_entry.attr,
629 &queue_max_active_zones_entry.attr,
630 &queue_nomerges_entry.attr,
631 &queue_iostats_entry.attr,
632 &queue_stable_writes_entry.attr,
633 &queue_random_entry.attr,
634 &queue_poll_entry.attr,
635 &queue_wc_entry.attr,
636 &queue_fua_entry.attr,
637 &queue_dax_entry.attr,
638 &queue_poll_delay_entry.attr,
639 &queue_virt_boundary_mask_entry.attr,
640 &queue_dma_alignment_entry.attr,
641 NULL,
642 };
643
644 /* Request-based queue attributes that are not relevant for bio-based queues. */
645 static struct attribute *blk_mq_queue_attrs[] = {
646 &queue_requests_entry.attr,
647 &elv_iosched_entry.attr,
648 &queue_rq_affinity_entry.attr,
649 &queue_io_timeout_entry.attr,
650 #ifdef CONFIG_BLK_WBT
651 &queue_wb_lat_entry.attr,
652 #endif
653 NULL,
654 };
655
queue_attr_visible(struct kobject * kobj,struct attribute * attr,int n)656 static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
657 int n)
658 {
659 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
660 struct request_queue *q = disk->queue;
661
662 if ((attr == &queue_max_open_zones_entry.attr ||
663 attr == &queue_max_active_zones_entry.attr) &&
664 !blk_queue_is_zoned(q))
665 return 0;
666
667 return attr->mode;
668 }
669
blk_mq_queue_attr_visible(struct kobject * kobj,struct attribute * attr,int n)670 static umode_t blk_mq_queue_attr_visible(struct kobject *kobj,
671 struct attribute *attr, int n)
672 {
673 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
674 struct request_queue *q = disk->queue;
675
676 if (!queue_is_mq(q))
677 return 0;
678
679 if (attr == &queue_io_timeout_entry.attr && !q->mq_ops->timeout)
680 return 0;
681
682 return attr->mode;
683 }
684
685 static struct attribute_group queue_attr_group = {
686 .attrs = queue_attrs,
687 .is_visible = queue_attr_visible,
688 };
689
690 static struct attribute_group blk_mq_queue_attr_group = {
691 .attrs = blk_mq_queue_attrs,
692 .is_visible = blk_mq_queue_attr_visible,
693 };
694
695 #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
696
697 static ssize_t
queue_attr_show(struct kobject * kobj,struct attribute * attr,char * page)698 queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
699 {
700 struct queue_sysfs_entry *entry = to_queue(attr);
701 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
702 struct request_queue *q = disk->queue;
703 ssize_t res;
704
705 if (!entry->show)
706 return -EIO;
707 mutex_lock(&q->sysfs_lock);
708 res = entry->show(q, page);
709 mutex_unlock(&q->sysfs_lock);
710 return res;
711 }
712
713 static ssize_t
queue_attr_store(struct kobject * kobj,struct attribute * attr,const char * page,size_t length)714 queue_attr_store(struct kobject *kobj, struct attribute *attr,
715 const char *page, size_t length)
716 {
717 struct queue_sysfs_entry *entry = to_queue(attr);
718 struct gendisk *disk = container_of(kobj, struct gendisk, queue_kobj);
719 struct request_queue *q = disk->queue;
720 ssize_t res;
721
722 if (!entry->store)
723 return -EIO;
724
725 mutex_lock(&q->sysfs_lock);
726 res = entry->store(q, page, length);
727 mutex_unlock(&q->sysfs_lock);
728 return res;
729 }
730
731 static const struct sysfs_ops queue_sysfs_ops = {
732 .show = queue_attr_show,
733 .store = queue_attr_store,
734 };
735
736 static const struct attribute_group *blk_queue_attr_groups[] = {
737 &queue_attr_group,
738 &blk_mq_queue_attr_group,
739 NULL
740 };
741
blk_queue_release(struct kobject * kobj)742 static void blk_queue_release(struct kobject *kobj)
743 {
744 /* nothing to do here, all data is associated with the parent gendisk */
745 }
746
747 static const struct kobj_type blk_queue_ktype = {
748 .default_groups = blk_queue_attr_groups,
749 .sysfs_ops = &queue_sysfs_ops,
750 .release = blk_queue_release,
751 };
752
blk_debugfs_remove(struct gendisk * disk)753 static void blk_debugfs_remove(struct gendisk *disk)
754 {
755 struct request_queue *q = disk->queue;
756
757 mutex_lock(&q->debugfs_mutex);
758 blk_trace_shutdown(q);
759 debugfs_remove_recursive(q->debugfs_dir);
760 q->debugfs_dir = NULL;
761 q->sched_debugfs_dir = NULL;
762 q->rqos_debugfs_dir = NULL;
763 mutex_unlock(&q->debugfs_mutex);
764 }
765
766 /**
767 * blk_register_queue - register a block layer queue with sysfs
768 * @disk: Disk of which the request queue should be registered with sysfs.
769 */
blk_register_queue(struct gendisk * disk)770 int blk_register_queue(struct gendisk *disk)
771 {
772 struct request_queue *q = disk->queue;
773 int ret;
774
775 mutex_lock(&q->sysfs_dir_lock);
776 kobject_init(&disk->queue_kobj, &blk_queue_ktype);
777 ret = kobject_add(&disk->queue_kobj, &disk_to_dev(disk)->kobj, "queue");
778 if (ret < 0)
779 goto out_put_queue_kobj;
780
781 if (queue_is_mq(q)) {
782 ret = blk_mq_sysfs_register(disk);
783 if (ret)
784 goto out_put_queue_kobj;
785 }
786 mutex_lock(&q->sysfs_lock);
787
788 mutex_lock(&q->debugfs_mutex);
789 q->debugfs_dir = debugfs_create_dir(disk->disk_name, blk_debugfs_root);
790 if (queue_is_mq(q))
791 blk_mq_debugfs_register(q);
792 mutex_unlock(&q->debugfs_mutex);
793
794 ret = disk_register_independent_access_ranges(disk);
795 if (ret)
796 goto out_debugfs_remove;
797
798 if (q->elevator) {
799 ret = elv_register_queue(q, false);
800 if (ret)
801 goto out_unregister_ia_ranges;
802 }
803
804 ret = blk_crypto_sysfs_register(disk);
805 if (ret)
806 goto out_elv_unregister;
807
808 blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q);
809 wbt_enable_default(disk);
810
811 /* Now everything is ready and send out KOBJ_ADD uevent */
812 kobject_uevent(&disk->queue_kobj, KOBJ_ADD);
813 if (q->elevator)
814 kobject_uevent(&q->elevator->kobj, KOBJ_ADD);
815 mutex_unlock(&q->sysfs_lock);
816 mutex_unlock(&q->sysfs_dir_lock);
817
818 /*
819 * SCSI probing may synchronously create and destroy a lot of
820 * request_queues for non-existent devices. Shutting down a fully
821 * functional queue takes measureable wallclock time as RCU grace
822 * periods are involved. To avoid excessive latency in these
823 * cases, a request_queue starts out in a degraded mode which is
824 * faster to shut down and is made fully functional here as
825 * request_queues for non-existent devices never get registered.
826 */
827 if (!blk_queue_init_done(q)) {
828 blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q);
829 percpu_ref_switch_to_percpu(&q->q_usage_counter);
830 }
831
832 return ret;
833
834 out_elv_unregister:
835 elv_unregister_queue(q);
836 out_unregister_ia_ranges:
837 disk_unregister_independent_access_ranges(disk);
838 out_debugfs_remove:
839 blk_debugfs_remove(disk);
840 mutex_unlock(&q->sysfs_lock);
841 out_put_queue_kobj:
842 kobject_put(&disk->queue_kobj);
843 mutex_unlock(&q->sysfs_dir_lock);
844 return ret;
845 }
846
847 /**
848 * blk_unregister_queue - counterpart of blk_register_queue()
849 * @disk: Disk of which the request queue should be unregistered from sysfs.
850 *
851 * Note: the caller is responsible for guaranteeing that this function is called
852 * after blk_register_queue() has finished.
853 */
blk_unregister_queue(struct gendisk * disk)854 void blk_unregister_queue(struct gendisk *disk)
855 {
856 struct request_queue *q = disk->queue;
857
858 if (WARN_ON(!q))
859 return;
860
861 /* Return early if disk->queue was never registered. */
862 if (!blk_queue_registered(q))
863 return;
864
865 /*
866 * Since sysfs_remove_dir() prevents adding new directory entries
867 * before removal of existing entries starts, protect against
868 * concurrent elv_iosched_store() calls.
869 */
870 mutex_lock(&q->sysfs_lock);
871 blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
872 mutex_unlock(&q->sysfs_lock);
873
874 mutex_lock(&q->sysfs_dir_lock);
875 /*
876 * Remove the sysfs attributes before unregistering the queue data
877 * structures that can be modified through sysfs.
878 */
879 if (queue_is_mq(q))
880 blk_mq_sysfs_unregister(disk);
881 blk_crypto_sysfs_unregister(disk);
882
883 mutex_lock(&q->sysfs_lock);
884 elv_unregister_queue(q);
885 disk_unregister_independent_access_ranges(disk);
886 mutex_unlock(&q->sysfs_lock);
887
888 /* Now that we've deleted all child objects, we can delete the queue. */
889 kobject_uevent(&disk->queue_kobj, KOBJ_REMOVE);
890 kobject_del(&disk->queue_kobj);
891 mutex_unlock(&q->sysfs_dir_lock);
892
893 blk_debugfs_remove(disk);
894 }
895