Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
8324aa91 JA |
2 | /* |
3 | * Functions related to sysfs handling | |
4 | */ | |
5 | #include <linux/kernel.h> | |
5a0e3ad6 | 6 | #include <linux/slab.h> |
8324aa91 JA |
7 | #include <linux/module.h> |
8 | #include <linux/bio.h> | |
9 | #include <linux/blkdev.h> | |
66114cad | 10 | #include <linux/backing-dev.h> |
8324aa91 | 11 | #include <linux/blktrace_api.h> |
320ae51f | 12 | #include <linux/blk-mq.h> |
eea8f41c | 13 | #include <linux/blk-cgroup.h> |
85e0cbbb | 14 | #include <linux/debugfs.h> |
8324aa91 JA |
15 | |
16 | #include "blk.h" | |
3edcc0ce | 17 | #include "blk-mq.h" |
d173a251 | 18 | #include "blk-mq-debugfs.h" |
87760e5e | 19 | #include "blk-wbt.h" |
8324aa91 JA |
20 | |
21 | struct queue_sysfs_entry { | |
22 | struct attribute attr; | |
23 | ssize_t (*show)(struct request_queue *, char *); | |
24 | ssize_t (*store)(struct request_queue *, const char *, size_t); | |
25 | }; | |
26 | ||
27 | static ssize_t | |
9cb308ce | 28 | queue_var_show(unsigned long var, char *page) |
8324aa91 | 29 | { |
9cb308ce | 30 | return sprintf(page, "%lu\n", var); |
8324aa91 JA |
31 | } |
32 | ||
33 | static ssize_t | |
34 | queue_var_store(unsigned long *var, const char *page, size_t count) | |
35 | { | |
b1f3b64d DR |
36 | int err; |
37 | unsigned long v; | |
38 | ||
ed751e68 | 39 | err = kstrtoul(page, 10, &v); |
b1f3b64d DR |
40 | if (err || v > UINT_MAX) |
41 | return -EINVAL; | |
42 | ||
43 | *var = v; | |
8324aa91 | 44 | |
8324aa91 JA |
45 | return count; |
46 | } | |
47 | ||
80e091d1 | 48 | static ssize_t queue_var_store64(s64 *var, const char *page) |
87760e5e JA |
49 | { |
50 | int err; | |
80e091d1 | 51 | s64 v; |
87760e5e | 52 | |
80e091d1 | 53 | err = kstrtos64(page, 10, &v); |
87760e5e JA |
54 | if (err < 0) |
55 | return err; | |
56 | ||
57 | *var = v; | |
58 | return 0; | |
59 | } | |
60 | ||
8324aa91 JA |
61 | static ssize_t queue_requests_show(struct request_queue *q, char *page) |
62 | { | |
63 | return queue_var_show(q->nr_requests, (page)); | |
64 | } | |
65 | ||
66 | static ssize_t | |
67 | queue_requests_store(struct request_queue *q, const char *page, size_t count) | |
68 | { | |
8324aa91 | 69 | unsigned long nr; |
e3a2b3f9 | 70 | int ret, err; |
b8a9ae77 | 71 | |
344e9ffc | 72 | if (!queue_is_mq(q)) |
b8a9ae77 JA |
73 | return -EINVAL; |
74 | ||
75 | ret = queue_var_store(&nr, page, count); | |
b1f3b64d DR |
76 | if (ret < 0) |
77 | return ret; | |
78 | ||
8324aa91 JA |
79 | if (nr < BLKDEV_MIN_RQ) |
80 | nr = BLKDEV_MIN_RQ; | |
81 | ||
a1ce35fa | 82 | err = blk_mq_update_nr_requests(q, nr); |
e3a2b3f9 JA |
83 | if (err) |
84 | return err; | |
85 | ||
8324aa91 JA |
86 | return ret; |
87 | } | |
88 | ||
89 | static ssize_t queue_ra_show(struct request_queue *q, char *page) | |
90 | { | |
dc3b17cc | 91 | unsigned long ra_kb = q->backing_dev_info->ra_pages << |
09cbfeaf | 92 | (PAGE_SHIFT - 10); |
8324aa91 JA |
93 | |
94 | return queue_var_show(ra_kb, (page)); | |
95 | } | |
96 | ||
97 | static ssize_t | |
98 | queue_ra_store(struct request_queue *q, const char *page, size_t count) | |
99 | { | |
100 | unsigned long ra_kb; | |
101 | ssize_t ret = queue_var_store(&ra_kb, page, count); | |
102 | ||
b1f3b64d DR |
103 | if (ret < 0) |
104 | return ret; | |
105 | ||
dc3b17cc | 106 | q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
107 | |
108 | return ret; | |
109 | } | |
110 | ||
111 | static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) | |
112 | { | |
ae03bf63 | 113 | int max_sectors_kb = queue_max_sectors(q) >> 1; |
8324aa91 JA |
114 | |
115 | return queue_var_show(max_sectors_kb, (page)); | |
116 | } | |
117 | ||
c77a5710 MP |
118 | static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
119 | { | |
120 | return queue_var_show(queue_max_segments(q), (page)); | |
121 | } | |
122 | ||
1e739730 CH |
123 | static ssize_t queue_max_discard_segments_show(struct request_queue *q, |
124 | char *page) | |
125 | { | |
126 | return queue_var_show(queue_max_discard_segments(q), (page)); | |
127 | } | |
128 | ||
13f05c8d MP |
129 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
130 | { | |
131 | return queue_var_show(q->limits.max_integrity_segments, (page)); | |
132 | } | |
133 | ||
c77a5710 MP |
134 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
135 | { | |
38417468 | 136 | return queue_var_show(queue_max_segment_size(q), (page)); |
c77a5710 MP |
137 | } |
138 | ||
e1defc4f | 139 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 140 | { |
e1defc4f | 141 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
142 | } |
143 | ||
c72758f3 MP |
144 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
145 | { | |
146 | return queue_var_show(queue_physical_block_size(q), page); | |
147 | } | |
148 | ||
87caf97c HR |
149 | static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
150 | { | |
151 | return queue_var_show(q->limits.chunk_sectors, page); | |
152 | } | |
153 | ||
c72758f3 MP |
154 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
155 | { | |
156 | return queue_var_show(queue_io_min(q), page); | |
157 | } | |
158 | ||
159 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
160 | { | |
161 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
162 | } |
163 | ||
86b37281 MP |
164 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
165 | { | |
166 | return queue_var_show(q->limits.discard_granularity, page); | |
167 | } | |
168 | ||
0034af03 JA |
169 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
170 | { | |
0034af03 | 171 | |
18f922d0 A |
172 | return sprintf(page, "%llu\n", |
173 | (unsigned long long)q->limits.max_hw_discard_sectors << 9); | |
0034af03 JA |
174 | } |
175 | ||
86b37281 MP |
176 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
177 | { | |
a934a00a MP |
178 | return sprintf(page, "%llu\n", |
179 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
180 | } |
181 | ||
0034af03 JA |
182 | static ssize_t queue_discard_max_store(struct request_queue *q, |
183 | const char *page, size_t count) | |
184 | { | |
185 | unsigned long max_discard; | |
186 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
187 | ||
188 | if (ret < 0) | |
189 | return ret; | |
190 | ||
191 | if (max_discard & (q->limits.discard_granularity - 1)) | |
192 | return -EINVAL; | |
193 | ||
194 | max_discard >>= 9; | |
195 | if (max_discard > UINT_MAX) | |
196 | return -EINVAL; | |
197 | ||
198 | if (max_discard > q->limits.max_hw_discard_sectors) | |
199 | max_discard = q->limits.max_hw_discard_sectors; | |
200 | ||
201 | q->limits.max_discard_sectors = max_discard; | |
202 | return ret; | |
203 | } | |
204 | ||
98262f27 MP |
205 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
206 | { | |
48920ff2 | 207 | return queue_var_show(0, page); |
98262f27 MP |
208 | } |
209 | ||
4363ac7c MP |
210 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
211 | { | |
212 | return sprintf(page, "%llu\n", | |
213 | (unsigned long long)q->limits.max_write_same_sectors << 9); | |
214 | } | |
215 | ||
a6f0788e CK |
216 | static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
217 | { | |
218 | return sprintf(page, "%llu\n", | |
219 | (unsigned long long)q->limits.max_write_zeroes_sectors << 9); | |
220 | } | |
4363ac7c | 221 | |
0512a75b KB |
222 | static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page) |
223 | { | |
224 | unsigned long long max_sectors = q->limits.max_zone_append_sectors; | |
225 | ||
226 | return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT); | |
227 | } | |
228 | ||
8324aa91 JA |
229 | static ssize_t |
230 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
231 | { | |
232 | unsigned long max_sectors_kb, | |
ae03bf63 | 233 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 234 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
235 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
236 | ||
b1f3b64d DR |
237 | if (ret < 0) |
238 | return ret; | |
239 | ||
ca369d51 MP |
240 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
241 | q->limits.max_dev_sectors >> 1); | |
242 | ||
8324aa91 JA |
243 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
244 | return -EINVAL; | |
7c239517 | 245 | |
0d945c1f | 246 | spin_lock_irq(&q->queue_lock); |
c295fc05 | 247 | q->limits.max_sectors = max_sectors_kb << 1; |
dc3b17cc | 248 | q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10); |
0d945c1f | 249 | spin_unlock_irq(&q->queue_lock); |
8324aa91 JA |
250 | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
255 | { | |
ae03bf63 | 256 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
257 | |
258 | return queue_var_show(max_hw_sectors_kb, (page)); | |
259 | } | |
260 | ||
956bcb7c JA |
261 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
262 | static ssize_t \ | |
263 | queue_show_##name(struct request_queue *q, char *page) \ | |
264 | { \ | |
265 | int bit; \ | |
266 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
267 | return queue_var_show(neg ? !bit : bit, page); \ | |
268 | } \ | |
269 | static ssize_t \ | |
270 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
271 | { \ | |
272 | unsigned long val; \ | |
273 | ssize_t ret; \ | |
274 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
275 | if (ret < 0) \ |
276 | return ret; \ | |
956bcb7c JA |
277 | if (neg) \ |
278 | val = !val; \ | |
279 | \ | |
956bcb7c | 280 | if (val) \ |
8814ce8a | 281 | blk_queue_flag_set(QUEUE_FLAG_##flag, q); \ |
956bcb7c | 282 | else \ |
8814ce8a | 283 | blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \ |
956bcb7c | 284 | return ret; \ |
1308835f BZ |
285 | } |
286 | ||
956bcb7c JA |
287 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
288 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
289 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
290 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 291 | |
797476b8 DLM |
292 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
293 | { | |
294 | switch (blk_queue_zoned_model(q)) { | |
295 | case BLK_ZONED_HA: | |
296 | return sprintf(page, "host-aware\n"); | |
297 | case BLK_ZONED_HM: | |
298 | return sprintf(page, "host-managed\n"); | |
299 | default: | |
300 | return sprintf(page, "none\n"); | |
301 | } | |
302 | } | |
303 | ||
965b652e DLM |
304 | static ssize_t queue_nr_zones_show(struct request_queue *q, char *page) |
305 | { | |
306 | return queue_var_show(blk_queue_nr_zones(q), page); | |
307 | } | |
308 | ||
e15864f8 NC |
309 | static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page) |
310 | { | |
311 | return queue_var_show(queue_max_open_zones(q), page); | |
312 | } | |
313 | ||
659bf827 NC |
314 | static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page) |
315 | { | |
316 | return queue_var_show(queue_max_active_zones(q), page); | |
317 | } | |
318 | ||
ac9fafa1 AB |
319 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
320 | { | |
488991e2 AB |
321 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
322 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
323 | } |
324 | ||
325 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
326 | size_t count) | |
327 | { | |
328 | unsigned long nm; | |
329 | ssize_t ret = queue_var_store(&nm, page, count); | |
330 | ||
b1f3b64d DR |
331 | if (ret < 0) |
332 | return ret; | |
333 | ||
57d74df9 CH |
334 | blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
335 | blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
488991e2 | 336 | if (nm == 2) |
57d74df9 | 337 | blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 | 338 | else if (nm) |
57d74df9 | 339 | blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
1308835f | 340 | |
ac9fafa1 AB |
341 | return ret; |
342 | } | |
343 | ||
c7c22e4d JA |
344 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
345 | { | |
9cb308ce | 346 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 347 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 348 | |
5757a6d7 | 349 | return queue_var_show(set << force, page); |
c7c22e4d JA |
350 | } |
351 | ||
352 | static ssize_t | |
353 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
354 | { | |
355 | ssize_t ret = -EINVAL; | |
0a06ff06 | 356 | #ifdef CONFIG_SMP |
c7c22e4d JA |
357 | unsigned long val; |
358 | ||
359 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
360 | if (ret < 0) |
361 | return ret; | |
362 | ||
e8037d49 | 363 | if (val == 2) { |
57d74df9 CH |
364 | blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
365 | blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); | |
e8037d49 | 366 | } else if (val == 1) { |
57d74df9 CH |
367 | blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
368 | blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
e8037d49 | 369 | } else if (val == 0) { |
57d74df9 CH |
370 | blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
371 | blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
5757a6d7 | 372 | } |
c7c22e4d JA |
373 | #endif |
374 | return ret; | |
375 | } | |
8324aa91 | 376 | |
06426adf JA |
377 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
378 | { | |
64f1c21e JA |
379 | int val; |
380 | ||
29ece8b4 YY |
381 | if (q->poll_nsec == BLK_MQ_POLL_CLASSIC) |
382 | val = BLK_MQ_POLL_CLASSIC; | |
64f1c21e JA |
383 | else |
384 | val = q->poll_nsec / 1000; | |
385 | ||
386 | return sprintf(page, "%d\n", val); | |
06426adf JA |
387 | } |
388 | ||
389 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
390 | size_t count) | |
391 | { | |
64f1c21e | 392 | int err, val; |
06426adf JA |
393 | |
394 | if (!q->mq_ops || !q->mq_ops->poll) | |
395 | return -EINVAL; | |
396 | ||
64f1c21e JA |
397 | err = kstrtoint(page, 10, &val); |
398 | if (err < 0) | |
399 | return err; | |
06426adf | 400 | |
29ece8b4 YY |
401 | if (val == BLK_MQ_POLL_CLASSIC) |
402 | q->poll_nsec = BLK_MQ_POLL_CLASSIC; | |
403 | else if (val >= 0) | |
64f1c21e | 404 | q->poll_nsec = val * 1000; |
29ece8b4 YY |
405 | else |
406 | return -EINVAL; | |
64f1c21e JA |
407 | |
408 | return count; | |
06426adf JA |
409 | } |
410 | ||
05229bee JA |
411 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
412 | { | |
413 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
414 | } | |
415 | ||
416 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
417 | size_t count) | |
418 | { | |
419 | unsigned long poll_on; | |
420 | ssize_t ret; | |
421 | ||
cd19181b ML |
422 | if (!q->tag_set || q->tag_set->nr_maps <= HCTX_TYPE_POLL || |
423 | !q->tag_set->map[HCTX_TYPE_POLL].nr_queues) | |
05229bee JA |
424 | return -EINVAL; |
425 | ||
426 | ret = queue_var_store(&poll_on, page, count); | |
427 | if (ret < 0) | |
428 | return ret; | |
429 | ||
05229bee | 430 | if (poll_on) |
8814ce8a | 431 | blk_queue_flag_set(QUEUE_FLAG_POLL, q); |
05229bee | 432 | else |
8814ce8a | 433 | blk_queue_flag_clear(QUEUE_FLAG_POLL, q); |
05229bee JA |
434 | |
435 | return ret; | |
436 | } | |
437 | ||
65cd1d13 WZ |
438 | static ssize_t queue_io_timeout_show(struct request_queue *q, char *page) |
439 | { | |
440 | return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout)); | |
441 | } | |
442 | ||
443 | static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page, | |
444 | size_t count) | |
445 | { | |
446 | unsigned int val; | |
447 | int err; | |
448 | ||
449 | err = kstrtou32(page, 10, &val); | |
450 | if (err || val == 0) | |
451 | return -EINVAL; | |
452 | ||
453 | blk_queue_rq_timeout(q, msecs_to_jiffies(val)); | |
454 | ||
455 | return count; | |
456 | } | |
457 | ||
87760e5e JA |
458 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
459 | { | |
a7905043 | 460 | if (!wbt_rq_qos(q)) |
87760e5e JA |
461 | return -EINVAL; |
462 | ||
a7905043 | 463 | return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000)); |
87760e5e JA |
464 | } |
465 | ||
466 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
467 | size_t count) | |
468 | { | |
a7905043 | 469 | struct rq_qos *rqos; |
87760e5e | 470 | ssize_t ret; |
80e091d1 | 471 | s64 val; |
87760e5e | 472 | |
87760e5e JA |
473 | ret = queue_var_store64(&val, page); |
474 | if (ret < 0) | |
475 | return ret; | |
d62118b6 JA |
476 | if (val < -1) |
477 | return -EINVAL; | |
478 | ||
a7905043 JB |
479 | rqos = wbt_rq_qos(q); |
480 | if (!rqos) { | |
d62118b6 JA |
481 | ret = wbt_init(q); |
482 | if (ret) | |
483 | return ret; | |
d62118b6 | 484 | } |
87760e5e | 485 | |
80e091d1 | 486 | if (val == -1) |
a7905043 | 487 | val = wbt_default_latency_nsec(q); |
80e091d1 | 488 | else if (val >= 0) |
a7905043 | 489 | val *= 1000ULL; |
d62118b6 | 490 | |
b7143fe6 AZ |
491 | if (wbt_get_min_lat(q) == val) |
492 | return count; | |
493 | ||
c125311d JA |
494 | /* |
495 | * Ensure that the queue is idled, in case the latency update | |
496 | * ends up either enabling or disabling wbt completely. We can't | |
497 | * have IO inflight if that happens. | |
498 | */ | |
a1ce35fa JA |
499 | blk_mq_freeze_queue(q); |
500 | blk_mq_quiesce_queue(q); | |
80e091d1 | 501 | |
c125311d | 502 | wbt_set_min_lat(q, val); |
c125311d | 503 | |
a1ce35fa JA |
504 | blk_mq_unquiesce_queue(q); |
505 | blk_mq_unfreeze_queue(q); | |
c125311d | 506 | |
87760e5e JA |
507 | return count; |
508 | } | |
509 | ||
93e9d8e8 JA |
510 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
511 | { | |
512 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
513 | return sprintf(page, "write back\n"); | |
514 | ||
515 | return sprintf(page, "write through\n"); | |
516 | } | |
517 | ||
518 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
519 | size_t count) | |
520 | { | |
521 | int set = -1; | |
522 | ||
523 | if (!strncmp(page, "write back", 10)) | |
524 | set = 1; | |
525 | else if (!strncmp(page, "write through", 13) || | |
526 | !strncmp(page, "none", 4)) | |
527 | set = 0; | |
528 | ||
529 | if (set == -1) | |
530 | return -EINVAL; | |
531 | ||
93e9d8e8 | 532 | if (set) |
8814ce8a | 533 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
93e9d8e8 | 534 | else |
8814ce8a | 535 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
93e9d8e8 JA |
536 | |
537 | return count; | |
538 | } | |
539 | ||
6fcefbe5 KO |
540 | static ssize_t queue_fua_show(struct request_queue *q, char *page) |
541 | { | |
542 | return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags)); | |
543 | } | |
544 | ||
ea6ca600 YK |
545 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
546 | { | |
547 | return queue_var_show(blk_queue_dax(q), page); | |
548 | } | |
549 | ||
8324aa91 | 550 | static struct queue_sysfs_entry queue_requests_entry = { |
5657a819 | 551 | .attr = {.name = "nr_requests", .mode = 0644 }, |
8324aa91 JA |
552 | .show = queue_requests_show, |
553 | .store = queue_requests_store, | |
554 | }; | |
555 | ||
556 | static struct queue_sysfs_entry queue_ra_entry = { | |
5657a819 | 557 | .attr = {.name = "read_ahead_kb", .mode = 0644 }, |
8324aa91 JA |
558 | .show = queue_ra_show, |
559 | .store = queue_ra_store, | |
560 | }; | |
561 | ||
562 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
5657a819 | 563 | .attr = {.name = "max_sectors_kb", .mode = 0644 }, |
8324aa91 JA |
564 | .show = queue_max_sectors_show, |
565 | .store = queue_max_sectors_store, | |
566 | }; | |
567 | ||
568 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
5657a819 | 569 | .attr = {.name = "max_hw_sectors_kb", .mode = 0444 }, |
8324aa91 JA |
570 | .show = queue_max_hw_sectors_show, |
571 | }; | |
572 | ||
c77a5710 | 573 | static struct queue_sysfs_entry queue_max_segments_entry = { |
5657a819 | 574 | .attr = {.name = "max_segments", .mode = 0444 }, |
c77a5710 MP |
575 | .show = queue_max_segments_show, |
576 | }; | |
577 | ||
1e739730 | 578 | static struct queue_sysfs_entry queue_max_discard_segments_entry = { |
5657a819 | 579 | .attr = {.name = "max_discard_segments", .mode = 0444 }, |
1e739730 CH |
580 | .show = queue_max_discard_segments_show, |
581 | }; | |
582 | ||
13f05c8d | 583 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
5657a819 | 584 | .attr = {.name = "max_integrity_segments", .mode = 0444 }, |
13f05c8d MP |
585 | .show = queue_max_integrity_segments_show, |
586 | }; | |
587 | ||
c77a5710 | 588 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
5657a819 | 589 | .attr = {.name = "max_segment_size", .mode = 0444 }, |
c77a5710 MP |
590 | .show = queue_max_segment_size_show, |
591 | }; | |
592 | ||
8324aa91 | 593 | static struct queue_sysfs_entry queue_iosched_entry = { |
5657a819 | 594 | .attr = {.name = "scheduler", .mode = 0644 }, |
8324aa91 JA |
595 | .show = elv_iosched_show, |
596 | .store = elv_iosched_store, | |
597 | }; | |
598 | ||
e68b903c | 599 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
5657a819 | 600 | .attr = {.name = "hw_sector_size", .mode = 0444 }, |
e1defc4f MP |
601 | .show = queue_logical_block_size_show, |
602 | }; | |
603 | ||
604 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
5657a819 | 605 | .attr = {.name = "logical_block_size", .mode = 0444 }, |
e1defc4f | 606 | .show = queue_logical_block_size_show, |
e68b903c MP |
607 | }; |
608 | ||
c72758f3 | 609 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
5657a819 | 610 | .attr = {.name = "physical_block_size", .mode = 0444 }, |
c72758f3 MP |
611 | .show = queue_physical_block_size_show, |
612 | }; | |
613 | ||
87caf97c | 614 | static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
5657a819 | 615 | .attr = {.name = "chunk_sectors", .mode = 0444 }, |
87caf97c HR |
616 | .show = queue_chunk_sectors_show, |
617 | }; | |
618 | ||
c72758f3 | 619 | static struct queue_sysfs_entry queue_io_min_entry = { |
5657a819 | 620 | .attr = {.name = "minimum_io_size", .mode = 0444 }, |
c72758f3 MP |
621 | .show = queue_io_min_show, |
622 | }; | |
623 | ||
624 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
5657a819 | 625 | .attr = {.name = "optimal_io_size", .mode = 0444 }, |
c72758f3 | 626 | .show = queue_io_opt_show, |
e68b903c MP |
627 | }; |
628 | ||
86b37281 | 629 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
5657a819 | 630 | .attr = {.name = "discard_granularity", .mode = 0444 }, |
86b37281 MP |
631 | .show = queue_discard_granularity_show, |
632 | }; | |
633 | ||
0034af03 | 634 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
5657a819 | 635 | .attr = {.name = "discard_max_hw_bytes", .mode = 0444 }, |
0034af03 JA |
636 | .show = queue_discard_max_hw_show, |
637 | }; | |
638 | ||
86b37281 | 639 | static struct queue_sysfs_entry queue_discard_max_entry = { |
5657a819 | 640 | .attr = {.name = "discard_max_bytes", .mode = 0644 }, |
86b37281 | 641 | .show = queue_discard_max_show, |
0034af03 | 642 | .store = queue_discard_max_store, |
86b37281 MP |
643 | }; |
644 | ||
98262f27 | 645 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
5657a819 | 646 | .attr = {.name = "discard_zeroes_data", .mode = 0444 }, |
98262f27 MP |
647 | .show = queue_discard_zeroes_data_show, |
648 | }; | |
649 | ||
4363ac7c | 650 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
5657a819 | 651 | .attr = {.name = "write_same_max_bytes", .mode = 0444 }, |
4363ac7c MP |
652 | .show = queue_write_same_max_show, |
653 | }; | |
654 | ||
a6f0788e | 655 | static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
5657a819 | 656 | .attr = {.name = "write_zeroes_max_bytes", .mode = 0444 }, |
a6f0788e CK |
657 | .show = queue_write_zeroes_max_show, |
658 | }; | |
659 | ||
0512a75b KB |
660 | static struct queue_sysfs_entry queue_zone_append_max_entry = { |
661 | .attr = {.name = "zone_append_max_bytes", .mode = 0444 }, | |
662 | .show = queue_zone_append_max_show, | |
663 | }; | |
664 | ||
1308835f | 665 | static struct queue_sysfs_entry queue_nonrot_entry = { |
5657a819 | 666 | .attr = {.name = "rotational", .mode = 0644 }, |
956bcb7c JA |
667 | .show = queue_show_nonrot, |
668 | .store = queue_store_nonrot, | |
1308835f BZ |
669 | }; |
670 | ||
797476b8 | 671 | static struct queue_sysfs_entry queue_zoned_entry = { |
5657a819 | 672 | .attr = {.name = "zoned", .mode = 0444 }, |
797476b8 DLM |
673 | .show = queue_zoned_show, |
674 | }; | |
675 | ||
965b652e DLM |
676 | static struct queue_sysfs_entry queue_nr_zones_entry = { |
677 | .attr = {.name = "nr_zones", .mode = 0444 }, | |
678 | .show = queue_nr_zones_show, | |
679 | }; | |
680 | ||
e15864f8 NC |
681 | static struct queue_sysfs_entry queue_max_open_zones_entry = { |
682 | .attr = {.name = "max_open_zones", .mode = 0444 }, | |
683 | .show = queue_max_open_zones_show, | |
684 | }; | |
685 | ||
659bf827 NC |
686 | static struct queue_sysfs_entry queue_max_active_zones_entry = { |
687 | .attr = {.name = "max_active_zones", .mode = 0444 }, | |
688 | .show = queue_max_active_zones_show, | |
689 | }; | |
690 | ||
ac9fafa1 | 691 | static struct queue_sysfs_entry queue_nomerges_entry = { |
5657a819 | 692 | .attr = {.name = "nomerges", .mode = 0644 }, |
ac9fafa1 AB |
693 | .show = queue_nomerges_show, |
694 | .store = queue_nomerges_store, | |
695 | }; | |
696 | ||
c7c22e4d | 697 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
5657a819 | 698 | .attr = {.name = "rq_affinity", .mode = 0644 }, |
c7c22e4d JA |
699 | .show = queue_rq_affinity_show, |
700 | .store = queue_rq_affinity_store, | |
701 | }; | |
702 | ||
bc58ba94 | 703 | static struct queue_sysfs_entry queue_iostats_entry = { |
5657a819 | 704 | .attr = {.name = "iostats", .mode = 0644 }, |
956bcb7c JA |
705 | .show = queue_show_iostats, |
706 | .store = queue_store_iostats, | |
bc58ba94 JA |
707 | }; |
708 | ||
e2e1a148 | 709 | static struct queue_sysfs_entry queue_random_entry = { |
5657a819 | 710 | .attr = {.name = "add_random", .mode = 0644 }, |
956bcb7c JA |
711 | .show = queue_show_random, |
712 | .store = queue_store_random, | |
e2e1a148 JA |
713 | }; |
714 | ||
05229bee | 715 | static struct queue_sysfs_entry queue_poll_entry = { |
5657a819 | 716 | .attr = {.name = "io_poll", .mode = 0644 }, |
05229bee JA |
717 | .show = queue_poll_show, |
718 | .store = queue_poll_store, | |
719 | }; | |
720 | ||
06426adf | 721 | static struct queue_sysfs_entry queue_poll_delay_entry = { |
5657a819 | 722 | .attr = {.name = "io_poll_delay", .mode = 0644 }, |
06426adf JA |
723 | .show = queue_poll_delay_show, |
724 | .store = queue_poll_delay_store, | |
725 | }; | |
726 | ||
93e9d8e8 | 727 | static struct queue_sysfs_entry queue_wc_entry = { |
5657a819 | 728 | .attr = {.name = "write_cache", .mode = 0644 }, |
93e9d8e8 JA |
729 | .show = queue_wc_show, |
730 | .store = queue_wc_store, | |
731 | }; | |
732 | ||
6fcefbe5 | 733 | static struct queue_sysfs_entry queue_fua_entry = { |
5657a819 | 734 | .attr = {.name = "fua", .mode = 0444 }, |
6fcefbe5 KO |
735 | .show = queue_fua_show, |
736 | }; | |
737 | ||
ea6ca600 | 738 | static struct queue_sysfs_entry queue_dax_entry = { |
5657a819 | 739 | .attr = {.name = "dax", .mode = 0444 }, |
ea6ca600 YK |
740 | .show = queue_dax_show, |
741 | }; | |
742 | ||
65cd1d13 WZ |
743 | static struct queue_sysfs_entry queue_io_timeout_entry = { |
744 | .attr = {.name = "io_timeout", .mode = 0644 }, | |
745 | .show = queue_io_timeout_show, | |
746 | .store = queue_io_timeout_store, | |
747 | }; | |
748 | ||
87760e5e | 749 | static struct queue_sysfs_entry queue_wb_lat_entry = { |
5657a819 | 750 | .attr = {.name = "wbt_lat_usec", .mode = 0644 }, |
87760e5e JA |
751 | .show = queue_wb_lat_show, |
752 | .store = queue_wb_lat_store, | |
753 | }; | |
754 | ||
297e3d85 SL |
755 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
756 | static struct queue_sysfs_entry throtl_sample_time_entry = { | |
5657a819 | 757 | .attr = {.name = "throttle_sample_time", .mode = 0644 }, |
297e3d85 SL |
758 | .show = blk_throtl_sample_time_show, |
759 | .store = blk_throtl_sample_time_store, | |
760 | }; | |
761 | #endif | |
762 | ||
4d25339e | 763 | static struct attribute *queue_attrs[] = { |
8324aa91 JA |
764 | &queue_requests_entry.attr, |
765 | &queue_ra_entry.attr, | |
766 | &queue_max_hw_sectors_entry.attr, | |
767 | &queue_max_sectors_entry.attr, | |
c77a5710 | 768 | &queue_max_segments_entry.attr, |
1e739730 | 769 | &queue_max_discard_segments_entry.attr, |
13f05c8d | 770 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 771 | &queue_max_segment_size_entry.attr, |
8324aa91 | 772 | &queue_iosched_entry.attr, |
e68b903c | 773 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 774 | &queue_logical_block_size_entry.attr, |
c72758f3 | 775 | &queue_physical_block_size_entry.attr, |
87caf97c | 776 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
777 | &queue_io_min_entry.attr, |
778 | &queue_io_opt_entry.attr, | |
86b37281 MP |
779 | &queue_discard_granularity_entry.attr, |
780 | &queue_discard_max_entry.attr, | |
0034af03 | 781 | &queue_discard_max_hw_entry.attr, |
98262f27 | 782 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 783 | &queue_write_same_max_entry.attr, |
a6f0788e | 784 | &queue_write_zeroes_max_entry.attr, |
0512a75b | 785 | &queue_zone_append_max_entry.attr, |
1308835f | 786 | &queue_nonrot_entry.attr, |
797476b8 | 787 | &queue_zoned_entry.attr, |
965b652e | 788 | &queue_nr_zones_entry.attr, |
e15864f8 | 789 | &queue_max_open_zones_entry.attr, |
659bf827 | 790 | &queue_max_active_zones_entry.attr, |
ac9fafa1 | 791 | &queue_nomerges_entry.attr, |
c7c22e4d | 792 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 793 | &queue_iostats_entry.attr, |
e2e1a148 | 794 | &queue_random_entry.attr, |
05229bee | 795 | &queue_poll_entry.attr, |
93e9d8e8 | 796 | &queue_wc_entry.attr, |
6fcefbe5 | 797 | &queue_fua_entry.attr, |
ea6ca600 | 798 | &queue_dax_entry.attr, |
87760e5e | 799 | &queue_wb_lat_entry.attr, |
06426adf | 800 | &queue_poll_delay_entry.attr, |
65cd1d13 | 801 | &queue_io_timeout_entry.attr, |
297e3d85 SL |
802 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
803 | &throtl_sample_time_entry.attr, | |
804 | #endif | |
8324aa91 JA |
805 | NULL, |
806 | }; | |
807 | ||
4d25339e WZ |
808 | static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr, |
809 | int n) | |
810 | { | |
811 | struct request_queue *q = | |
812 | container_of(kobj, struct request_queue, kobj); | |
813 | ||
814 | if (attr == &queue_io_timeout_entry.attr && | |
815 | (!q->mq_ops || !q->mq_ops->timeout)) | |
816 | return 0; | |
817 | ||
659bf827 NC |
818 | if ((attr == &queue_max_open_zones_entry.attr || |
819 | attr == &queue_max_active_zones_entry.attr) && | |
e15864f8 NC |
820 | !blk_queue_is_zoned(q)) |
821 | return 0; | |
822 | ||
4d25339e WZ |
823 | return attr->mode; |
824 | } | |
825 | ||
826 | static struct attribute_group queue_attr_group = { | |
827 | .attrs = queue_attrs, | |
828 | .is_visible = queue_attr_visible, | |
829 | }; | |
830 | ||
831 | ||
8324aa91 JA |
832 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) |
833 | ||
834 | static ssize_t | |
835 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
836 | { | |
837 | struct queue_sysfs_entry *entry = to_queue(attr); | |
838 | struct request_queue *q = | |
839 | container_of(kobj, struct request_queue, kobj); | |
840 | ssize_t res; | |
841 | ||
842 | if (!entry->show) | |
843 | return -EIO; | |
844 | mutex_lock(&q->sysfs_lock); | |
8324aa91 JA |
845 | res = entry->show(q, page); |
846 | mutex_unlock(&q->sysfs_lock); | |
847 | return res; | |
848 | } | |
849 | ||
850 | static ssize_t | |
851 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
852 | const char *page, size_t length) | |
853 | { | |
854 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 855 | struct request_queue *q; |
8324aa91 JA |
856 | ssize_t res; |
857 | ||
858 | if (!entry->store) | |
859 | return -EIO; | |
6728cb0e JA |
860 | |
861 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 862 | mutex_lock(&q->sysfs_lock); |
8324aa91 JA |
863 | res = entry->store(q, page, length); |
864 | mutex_unlock(&q->sysfs_lock); | |
865 | return res; | |
866 | } | |
867 | ||
548bc8e1 TH |
868 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
869 | { | |
870 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
871 | rcu_head); | |
872 | kmem_cache_free(blk_requestq_cachep, q); | |
873 | } | |
874 | ||
47cdee29 ML |
875 | /* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */ |
876 | static void blk_exit_queue(struct request_queue *q) | |
877 | { | |
878 | /* | |
879 | * Since the I/O scheduler exit code may access cgroup information, | |
880 | * perform I/O scheduler exit before disassociating from the block | |
881 | * cgroup controller. | |
882 | */ | |
883 | if (q->elevator) { | |
884 | ioc_clear_queue(q); | |
c3e22192 | 885 | __elevator_exit(q, q->elevator); |
47cdee29 ML |
886 | q->elevator = NULL; |
887 | } | |
888 | ||
889 | /* | |
890 | * Remove all references to @q from the block cgroup controller before | |
891 | * restoring @q->queue_lock to avoid that restoring this pointer causes | |
892 | * e.g. blkcg_print_blkgs() to crash. | |
893 | */ | |
894 | blkcg_exit_queue(q); | |
895 | ||
896 | /* | |
897 | * Since the cgroup code may dereference the @q->backing_dev_info | |
898 | * pointer, only decrease its reference count after having removed the | |
899 | * association with the block cgroup controller. | |
900 | */ | |
901 | bdi_put(q->backing_dev_info); | |
902 | } | |
903 | ||
8324aa91 | 904 | /** |
e8c7d14a LC |
905 | * blk_release_queue - releases all allocated resources of the request_queue |
906 | * @kobj: pointer to a kobject, whose container is a request_queue | |
907 | * | |
908 | * This function releases all allocated resources of the request queue. | |
909 | * | |
910 | * The struct request_queue refcount is incremented with blk_get_queue() and | |
911 | * decremented with blk_put_queue(). Once the refcount reaches 0 this function | |
912 | * is called. | |
913 | * | |
914 | * For drivers that have a request_queue on a gendisk and added with | |
915 | * __device_add_disk() the refcount to request_queue will reach 0 with | |
916 | * the last put_disk() called by the driver. For drivers which don't use | |
917 | * __device_add_disk() this happens with blk_cleanup_queue(). | |
8324aa91 | 918 | * |
e8c7d14a LC |
919 | * Drivers exist which depend on the release of the request_queue to be |
920 | * synchronous, it should not be deferred. | |
921 | * | |
922 | * Context: can sleep | |
dc9edc44 | 923 | */ |
e8c7d14a | 924 | static void blk_release_queue(struct kobject *kobj) |
8324aa91 | 925 | { |
e8c7d14a LC |
926 | struct request_queue *q = |
927 | container_of(kobj, struct request_queue, kobj); | |
928 | ||
929 | might_sleep(); | |
8324aa91 | 930 | |
34dbad5d OS |
931 | if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags)) |
932 | blk_stat_remove_callback(q, q->poll_cb); | |
933 | blk_stat_free_callback(q->poll_cb); | |
777eb1bf | 934 | |
34dbad5d OS |
935 | blk_free_queue_stats(q->stats); |
936 | ||
e26cc082 | 937 | if (queue_is_mq(q)) |
938 | cancel_delayed_work_sync(&q->requeue_work); | |
939 | ||
47cdee29 ML |
940 | blk_exit_queue(q); |
941 | ||
bf505456 DLM |
942 | blk_queue_free_zone_bitmaps(q); |
943 | ||
344e9ffc | 944 | if (queue_is_mq(q)) |
e09aae7e | 945 | blk_mq_release(q); |
18741986 | 946 | |
8324aa91 | 947 | blk_trace_shutdown(q); |
85e0cbbb LC |
948 | mutex_lock(&q->debugfs_mutex); |
949 | debugfs_remove_recursive(q->debugfs_dir); | |
950 | mutex_unlock(&q->debugfs_mutex); | |
8324aa91 | 951 | |
344e9ffc | 952 | if (queue_is_mq(q)) |
62ebce16 OS |
953 | blk_mq_debugfs_unregister(q); |
954 | ||
338aa96d | 955 | bioset_exit(&q->bio_split); |
54efd50b | 956 | |
a73f730d | 957 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 958 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
959 | } |
960 | ||
52cf25d0 | 961 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
962 | .show = queue_attr_show, |
963 | .store = queue_attr_store, | |
964 | }; | |
965 | ||
966 | struct kobj_type blk_queue_ktype = { | |
967 | .sysfs_ops = &queue_sysfs_ops, | |
8324aa91 JA |
968 | .release = blk_release_queue, |
969 | }; | |
970 | ||
2c2086af BVA |
971 | /** |
972 | * blk_register_queue - register a block layer queue with sysfs | |
973 | * @disk: Disk of which the request queue should be registered with sysfs. | |
974 | */ | |
8324aa91 JA |
975 | int blk_register_queue(struct gendisk *disk) |
976 | { | |
977 | int ret; | |
1d54ad6d | 978 | struct device *dev = disk_to_dev(disk); |
8324aa91 | 979 | struct request_queue *q = disk->queue; |
cecf5d87 | 980 | bool has_elevator = false; |
8324aa91 | 981 | |
fb199746 | 982 | if (WARN_ON(!q)) |
8324aa91 JA |
983 | return -ENXIO; |
984 | ||
58c898ba | 985 | WARN_ONCE(blk_queue_registered(q), |
334335d2 OS |
986 | "%s is registering an already registered queue\n", |
987 | kobject_name(&dev->kobj)); | |
334335d2 | 988 | |
749fefe6 | 989 | /* |
17497acb TH |
990 | * SCSI probing may synchronously create and destroy a lot of |
991 | * request_queues for non-existent devices. Shutting down a fully | |
992 | * functional queue takes measureable wallclock time as RCU grace | |
993 | * periods are involved. To avoid excessive latency in these | |
994 | * cases, a request_queue starts out in a degraded mode which is | |
995 | * faster to shut down and is made fully functional here as | |
996 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 997 | */ |
df35c7c9 | 998 | if (!blk_queue_init_done(q)) { |
57d74df9 | 999 | blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q); |
3ef28e83 | 1000 | percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c9 | 1001 | } |
749fefe6 | 1002 | |
1d54ad6d LZ |
1003 | ret = blk_trace_init_sysfs(dev); |
1004 | if (ret) | |
1005 | return ret; | |
1006 | ||
cecf5d87 | 1007 | mutex_lock(&q->sysfs_dir_lock); |
b410aff2 | 1008 | |
c9059598 | 1009 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
1010 | if (ret < 0) { |
1011 | blk_trace_remove_sysfs(dev); | |
b410aff2 | 1012 | goto unlock; |
ed5302d3 | 1013 | } |
8324aa91 | 1014 | |
4d25339e WZ |
1015 | ret = sysfs_create_group(&q->kobj, &queue_attr_group); |
1016 | if (ret) { | |
1017 | blk_trace_remove_sysfs(dev); | |
1018 | kobject_del(&q->kobj); | |
1019 | kobject_put(&dev->kobj); | |
1020 | goto unlock; | |
1021 | } | |
1022 | ||
85e0cbbb LC |
1023 | mutex_lock(&q->debugfs_mutex); |
1024 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), | |
1025 | blk_debugfs_root); | |
1026 | mutex_unlock(&q->debugfs_mutex); | |
1027 | ||
344e9ffc | 1028 | if (queue_is_mq(q)) { |
2d0364c8 | 1029 | __blk_mq_register_dev(dev, q); |
a8ecdd71 BVA |
1030 | blk_mq_debugfs_register(q); |
1031 | } | |
9c1051aa | 1032 | |
b89f625e | 1033 | mutex_lock(&q->sysfs_lock); |
344e9ffc | 1034 | if (q->elevator) { |
cecf5d87 | 1035 | ret = elv_register_queue(q, false); |
80c6b157 | 1036 | if (ret) { |
b89f625e | 1037 | mutex_unlock(&q->sysfs_lock); |
cecf5d87 | 1038 | mutex_unlock(&q->sysfs_dir_lock); |
80c6b157 OS |
1039 | kobject_del(&q->kobj); |
1040 | blk_trace_remove_sysfs(dev); | |
1041 | kobject_put(&dev->kobj); | |
2c2086af | 1042 | return ret; |
80c6b157 | 1043 | } |
cecf5d87 | 1044 | has_elevator = true; |
8324aa91 | 1045 | } |
cecf5d87 | 1046 | |
cecf5d87 ML |
1047 | blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q); |
1048 | wbt_enable_default(q); | |
1049 | blk_throtl_register_queue(q); | |
1050 | ||
1051 | /* Now everything is ready and send out KOBJ_ADD uevent */ | |
1052 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
1053 | if (has_elevator) | |
1054 | kobject_uevent(&q->elevator->kobj, KOBJ_ADD); | |
1055 | mutex_unlock(&q->sysfs_lock); | |
1056 | ||
b410aff2 TE |
1057 | ret = 0; |
1058 | unlock: | |
cecf5d87 | 1059 | mutex_unlock(&q->sysfs_dir_lock); |
b410aff2 | 1060 | return ret; |
8324aa91 | 1061 | } |
fa70d2e2 | 1062 | EXPORT_SYMBOL_GPL(blk_register_queue); |
8324aa91 | 1063 | |
2c2086af BVA |
1064 | /** |
1065 | * blk_unregister_queue - counterpart of blk_register_queue() | |
1066 | * @disk: Disk of which the request queue should be unregistered from sysfs. | |
1067 | * | |
1068 | * Note: the caller is responsible for guaranteeing that this function is called | |
1069 | * after blk_register_queue() has finished. | |
1070 | */ | |
8324aa91 JA |
1071 | void blk_unregister_queue(struct gendisk *disk) |
1072 | { | |
1073 | struct request_queue *q = disk->queue; | |
1074 | ||
fb199746 AM |
1075 | if (WARN_ON(!q)) |
1076 | return; | |
1077 | ||
fa70d2e2 | 1078 | /* Return early if disk->queue was never registered. */ |
58c898ba | 1079 | if (!blk_queue_registered(q)) |
fa70d2e2 MS |
1080 | return; |
1081 | ||
667257e8 | 1082 | /* |
2c2086af BVA |
1083 | * Since sysfs_remove_dir() prevents adding new directory entries |
1084 | * before removal of existing entries starts, protect against | |
1085 | * concurrent elv_iosched_store() calls. | |
667257e8 | 1086 | */ |
e9a823fb | 1087 | mutex_lock(&q->sysfs_lock); |
8814ce8a | 1088 | blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q); |
cecf5d87 | 1089 | mutex_unlock(&q->sysfs_lock); |
02ba8893 | 1090 | |
cecf5d87 | 1091 | mutex_lock(&q->sysfs_dir_lock); |
2c2086af BVA |
1092 | /* |
1093 | * Remove the sysfs attributes before unregistering the queue data | |
1094 | * structures that can be modified through sysfs. | |
1095 | */ | |
344e9ffc | 1096 | if (queue_is_mq(q)) |
b21d5b30 | 1097 | blk_mq_unregister_dev(disk_to_dev(disk), q); |
8324aa91 | 1098 | |
48c0d4d4 ZK |
1099 | kobject_uevent(&q->kobj, KOBJ_REMOVE); |
1100 | kobject_del(&q->kobj); | |
1101 | blk_trace_remove_sysfs(disk_to_dev(disk)); | |
667257e8 | 1102 | |
b89f625e | 1103 | mutex_lock(&q->sysfs_lock); |
344e9ffc | 1104 | if (q->elevator) |
2c2086af | 1105 | elv_unregister_queue(q); |
b89f625e | 1106 | mutex_unlock(&q->sysfs_lock); |
cecf5d87 | 1107 | mutex_unlock(&q->sysfs_dir_lock); |
2c2086af BVA |
1108 | |
1109 | kobject_put(&disk_to_dev(disk)->kobj); | |
8324aa91 | 1110 | } |