Commit | Line | Data |
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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> |
85e0cbbb | 13 | #include <linux/debugfs.h> |
8324aa91 JA |
14 | |
15 | #include "blk.h" | |
3edcc0ce | 16 | #include "blk-mq.h" |
d173a251 | 17 | #include "blk-mq-debugfs.h" |
2aa7745b | 18 | #include "blk-mq-sched.h" |
87760e5e | 19 | #include "blk-wbt.h" |
672fdcf0 | 20 | #include "blk-cgroup.h" |
a7b36ee6 | 21 | #include "blk-throttle.h" |
8324aa91 JA |
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 | |
9cb308ce | 30 | queue_var_show(unsigned long var, char *page) |
8324aa91 | 31 | { |
9cb308ce | 32 | return sprintf(page, "%lu\n", var); |
8324aa91 JA |
33 | } |
34 | ||
35 | static ssize_t | |
36 | queue_var_store(unsigned long *var, const char *page, size_t count) | |
37 | { | |
b1f3b64d DR |
38 | int err; |
39 | unsigned long v; | |
40 | ||
ed751e68 | 41 | err = kstrtoul(page, 10, &v); |
b1f3b64d DR |
42 | if (err || v > UINT_MAX) |
43 | return -EINVAL; | |
44 | ||
45 | *var = v; | |
8324aa91 | 46 | |
8324aa91 JA |
47 | return count; |
48 | } | |
49 | ||
80e091d1 | 50 | static ssize_t queue_var_store64(s64 *var, const char *page) |
87760e5e JA |
51 | { |
52 | int err; | |
80e091d1 | 53 | s64 v; |
87760e5e | 54 | |
80e091d1 | 55 | err = kstrtos64(page, 10, &v); |
87760e5e JA |
56 | if (err < 0) |
57 | return err; | |
58 | ||
59 | *var = v; | |
60 | return 0; | |
61 | } | |
62 | ||
8324aa91 JA |
63 | static ssize_t queue_requests_show(struct request_queue *q, char *page) |
64 | { | |
28af7428 | 65 | return queue_var_show(q->nr_requests, page); |
8324aa91 JA |
66 | } |
67 | ||
68 | static ssize_t | |
69 | queue_requests_store(struct request_queue *q, const char *page, size_t count) | |
70 | { | |
8324aa91 | 71 | unsigned long nr; |
e3a2b3f9 | 72 | int ret, err; |
b8a9ae77 | 73 | |
344e9ffc | 74 | if (!queue_is_mq(q)) |
b8a9ae77 JA |
75 | return -EINVAL; |
76 | ||
77 | ret = queue_var_store(&nr, page, count); | |
b1f3b64d DR |
78 | if (ret < 0) |
79 | return ret; | |
80 | ||
8324aa91 JA |
81 | if (nr < BLKDEV_MIN_RQ) |
82 | nr = BLKDEV_MIN_RQ; | |
83 | ||
a1ce35fa | 84 | err = blk_mq_update_nr_requests(q, nr); |
e3a2b3f9 JA |
85 | if (err) |
86 | return err; | |
87 | ||
8324aa91 JA |
88 | return ret; |
89 | } | |
90 | ||
91 | static ssize_t queue_ra_show(struct request_queue *q, char *page) | |
92 | { | |
edb0872f | 93 | unsigned long ra_kb; |
8324aa91 | 94 | |
d152c682 | 95 | if (!q->disk) |
edb0872f | 96 | return -EINVAL; |
d152c682 | 97 | ra_kb = q->disk->bdi->ra_pages << (PAGE_SHIFT - 10); |
8c390ff9 | 98 | return queue_var_show(ra_kb, page); |
8324aa91 JA |
99 | } |
100 | ||
101 | static ssize_t | |
102 | queue_ra_store(struct request_queue *q, const char *page, size_t count) | |
103 | { | |
104 | unsigned long ra_kb; | |
edb0872f | 105 | ssize_t ret; |
8324aa91 | 106 | |
d152c682 | 107 | if (!q->disk) |
edb0872f CH |
108 | return -EINVAL; |
109 | ret = queue_var_store(&ra_kb, page, count); | |
b1f3b64d DR |
110 | if (ret < 0) |
111 | return ret; | |
d152c682 | 112 | q->disk->bdi->ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
113 | return ret; |
114 | } | |
115 | ||
116 | static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) | |
117 | { | |
ae03bf63 | 118 | int max_sectors_kb = queue_max_sectors(q) >> 1; |
8324aa91 | 119 | |
8c390ff9 | 120 | return queue_var_show(max_sectors_kb, page); |
8324aa91 JA |
121 | } |
122 | ||
c77a5710 MP |
123 | static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
124 | { | |
8c390ff9 | 125 | return queue_var_show(queue_max_segments(q), page); |
c77a5710 MP |
126 | } |
127 | ||
1e739730 CH |
128 | static ssize_t queue_max_discard_segments_show(struct request_queue *q, |
129 | char *page) | |
130 | { | |
8c390ff9 | 131 | return queue_var_show(queue_max_discard_segments(q), page); |
1e739730 CH |
132 | } |
133 | ||
13f05c8d MP |
134 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
135 | { | |
8c390ff9 | 136 | return queue_var_show(q->limits.max_integrity_segments, page); |
13f05c8d MP |
137 | } |
138 | ||
c77a5710 MP |
139 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
140 | { | |
8c390ff9 | 141 | return queue_var_show(queue_max_segment_size(q), page); |
c77a5710 MP |
142 | } |
143 | ||
e1defc4f | 144 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 145 | { |
e1defc4f | 146 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
147 | } |
148 | ||
c72758f3 MP |
149 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
150 | { | |
151 | return queue_var_show(queue_physical_block_size(q), page); | |
152 | } | |
153 | ||
87caf97c HR |
154 | static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
155 | { | |
156 | return queue_var_show(q->limits.chunk_sectors, page); | |
157 | } | |
158 | ||
c72758f3 MP |
159 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
160 | { | |
161 | return queue_var_show(queue_io_min(q), page); | |
162 | } | |
163 | ||
164 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
165 | { | |
166 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
167 | } |
168 | ||
86b37281 MP |
169 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
170 | { | |
171 | return queue_var_show(q->limits.discard_granularity, page); | |
172 | } | |
173 | ||
0034af03 JA |
174 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
175 | { | |
0034af03 | 176 | |
18f922d0 A |
177 | return sprintf(page, "%llu\n", |
178 | (unsigned long long)q->limits.max_hw_discard_sectors << 9); | |
0034af03 JA |
179 | } |
180 | ||
86b37281 MP |
181 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
182 | { | |
a934a00a MP |
183 | return sprintf(page, "%llu\n", |
184 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
185 | } |
186 | ||
0034af03 JA |
187 | static ssize_t queue_discard_max_store(struct request_queue *q, |
188 | const char *page, size_t count) | |
189 | { | |
190 | unsigned long max_discard; | |
191 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
192 | ||
193 | if (ret < 0) | |
194 | return ret; | |
195 | ||
196 | if (max_discard & (q->limits.discard_granularity - 1)) | |
197 | return -EINVAL; | |
198 | ||
199 | max_discard >>= 9; | |
200 | if (max_discard > UINT_MAX) | |
201 | return -EINVAL; | |
202 | ||
203 | if (max_discard > q->limits.max_hw_discard_sectors) | |
204 | max_discard = q->limits.max_hw_discard_sectors; | |
205 | ||
206 | q->limits.max_discard_sectors = max_discard; | |
207 | return ret; | |
208 | } | |
209 | ||
98262f27 MP |
210 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
211 | { | |
48920ff2 | 212 | return queue_var_show(0, page); |
98262f27 MP |
213 | } |
214 | ||
4363ac7c MP |
215 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
216 | { | |
73bd66d9 | 217 | return queue_var_show(0, page); |
4363ac7c MP |
218 | } |
219 | ||
a6f0788e CK |
220 | static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
221 | { | |
222 | return sprintf(page, "%llu\n", | |
223 | (unsigned long long)q->limits.max_write_zeroes_sectors << 9); | |
224 | } | |
4363ac7c | 225 | |
a805a4fa DLM |
226 | static ssize_t queue_zone_write_granularity_show(struct request_queue *q, |
227 | char *page) | |
228 | { | |
229 | return queue_var_show(queue_zone_write_granularity(q), page); | |
230 | } | |
231 | ||
0512a75b KB |
232 | static ssize_t queue_zone_append_max_show(struct request_queue *q, char *page) |
233 | { | |
234 | unsigned long long max_sectors = q->limits.max_zone_append_sectors; | |
235 | ||
236 | return sprintf(page, "%llu\n", max_sectors << SECTOR_SHIFT); | |
237 | } | |
238 | ||
8324aa91 JA |
239 | static ssize_t |
240 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
241 | { | |
242 | unsigned long max_sectors_kb, | |
ae03bf63 | 243 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 244 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
245 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
246 | ||
b1f3b64d DR |
247 | if (ret < 0) |
248 | return ret; | |
249 | ||
ca369d51 MP |
250 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
251 | q->limits.max_dev_sectors >> 1); | |
252 | ||
8324aa91 JA |
253 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
254 | return -EINVAL; | |
7c239517 | 255 | |
0d945c1f | 256 | spin_lock_irq(&q->queue_lock); |
c295fc05 | 257 | q->limits.max_sectors = max_sectors_kb << 1; |
d152c682 CH |
258 | if (q->disk) |
259 | q->disk->bdi->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10); | |
0d945c1f | 260 | spin_unlock_irq(&q->queue_lock); |
8324aa91 JA |
261 | |
262 | return ret; | |
263 | } | |
264 | ||
265 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
266 | { | |
ae03bf63 | 267 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 | 268 | |
8c390ff9 | 269 | return queue_var_show(max_hw_sectors_kb, page); |
8324aa91 JA |
270 | } |
271 | ||
28af7428 MG |
272 | static ssize_t queue_virt_boundary_mask_show(struct request_queue *q, char *page) |
273 | { | |
8c390ff9 | 274 | return queue_var_show(q->limits.virt_boundary_mask, page); |
28af7428 MG |
275 | } |
276 | ||
3850e13f KB |
277 | static ssize_t queue_dma_alignment_show(struct request_queue *q, char *page) |
278 | { | |
279 | return queue_var_show(queue_dma_alignment(q), page); | |
280 | } | |
281 | ||
956bcb7c JA |
282 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
283 | static ssize_t \ | |
fc93fe14 | 284 | queue_##name##_show(struct request_queue *q, char *page) \ |
956bcb7c JA |
285 | { \ |
286 | int bit; \ | |
287 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
288 | return queue_var_show(neg ? !bit : bit, page); \ | |
289 | } \ | |
290 | static ssize_t \ | |
fc93fe14 | 291 | queue_##name##_store(struct request_queue *q, const char *page, size_t count) \ |
956bcb7c JA |
292 | { \ |
293 | unsigned long val; \ | |
294 | ssize_t ret; \ | |
295 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
296 | if (ret < 0) \ |
297 | return ret; \ | |
956bcb7c JA |
298 | if (neg) \ |
299 | val = !val; \ | |
300 | \ | |
956bcb7c | 301 | if (val) \ |
8814ce8a | 302 | blk_queue_flag_set(QUEUE_FLAG_##flag, q); \ |
956bcb7c | 303 | else \ |
8814ce8a | 304 | blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \ |
956bcb7c | 305 | return ret; \ |
1308835f BZ |
306 | } |
307 | ||
956bcb7c JA |
308 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
309 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
310 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
1cb039f3 | 311 | QUEUE_SYSFS_BIT_FNS(stable_writes, STABLE_WRITES, 0); |
956bcb7c | 312 | #undef QUEUE_SYSFS_BIT_FNS |
1308835f | 313 | |
797476b8 DLM |
314 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
315 | { | |
316 | switch (blk_queue_zoned_model(q)) { | |
317 | case BLK_ZONED_HA: | |
318 | return sprintf(page, "host-aware\n"); | |
319 | case BLK_ZONED_HM: | |
320 | return sprintf(page, "host-managed\n"); | |
321 | default: | |
322 | return sprintf(page, "none\n"); | |
323 | } | |
324 | } | |
325 | ||
965b652e DLM |
326 | static ssize_t queue_nr_zones_show(struct request_queue *q, char *page) |
327 | { | |
d86e716a | 328 | return queue_var_show(disk_nr_zones(q->disk), page); |
965b652e DLM |
329 | } |
330 | ||
e15864f8 NC |
331 | static ssize_t queue_max_open_zones_show(struct request_queue *q, char *page) |
332 | { | |
1dc01720 | 333 | return queue_var_show(bdev_max_open_zones(q->disk->part0), page); |
e15864f8 NC |
334 | } |
335 | ||
659bf827 NC |
336 | static ssize_t queue_max_active_zones_show(struct request_queue *q, char *page) |
337 | { | |
1dc01720 | 338 | return queue_var_show(bdev_max_active_zones(q->disk->part0), page); |
659bf827 NC |
339 | } |
340 | ||
ac9fafa1 AB |
341 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
342 | { | |
488991e2 AB |
343 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
344 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
345 | } |
346 | ||
347 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
348 | size_t count) | |
349 | { | |
350 | unsigned long nm; | |
351 | ssize_t ret = queue_var_store(&nm, page, count); | |
352 | ||
b1f3b64d DR |
353 | if (ret < 0) |
354 | return ret; | |
355 | ||
57d74df9 CH |
356 | blk_queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
357 | blk_queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
488991e2 | 358 | if (nm == 2) |
57d74df9 | 359 | blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 | 360 | else if (nm) |
57d74df9 | 361 | blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
1308835f | 362 | |
ac9fafa1 AB |
363 | return ret; |
364 | } | |
365 | ||
c7c22e4d JA |
366 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
367 | { | |
9cb308ce | 368 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 369 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 370 | |
5757a6d7 | 371 | return queue_var_show(set << force, page); |
c7c22e4d JA |
372 | } |
373 | ||
374 | static ssize_t | |
375 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
376 | { | |
377 | ssize_t ret = -EINVAL; | |
0a06ff06 | 378 | #ifdef CONFIG_SMP |
c7c22e4d JA |
379 | unsigned long val; |
380 | ||
381 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
382 | if (ret < 0) |
383 | return ret; | |
384 | ||
e8037d49 | 385 | if (val == 2) { |
57d74df9 CH |
386 | blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
387 | blk_queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); | |
e8037d49 | 388 | } else if (val == 1) { |
57d74df9 CH |
389 | blk_queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
390 | blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
e8037d49 | 391 | } else if (val == 0) { |
57d74df9 CH |
392 | blk_queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
393 | blk_queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
5757a6d7 | 394 | } |
c7c22e4d JA |
395 | #endif |
396 | return ret; | |
397 | } | |
8324aa91 | 398 | |
06426adf JA |
399 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
400 | { | |
64f1c21e JA |
401 | int val; |
402 | ||
29ece8b4 YY |
403 | if (q->poll_nsec == BLK_MQ_POLL_CLASSIC) |
404 | val = BLK_MQ_POLL_CLASSIC; | |
64f1c21e JA |
405 | else |
406 | val = q->poll_nsec / 1000; | |
407 | ||
408 | return sprintf(page, "%d\n", val); | |
06426adf JA |
409 | } |
410 | ||
411 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
412 | size_t count) | |
413 | { | |
64f1c21e | 414 | int err, val; |
06426adf JA |
415 | |
416 | if (!q->mq_ops || !q->mq_ops->poll) | |
417 | return -EINVAL; | |
418 | ||
64f1c21e JA |
419 | err = kstrtoint(page, 10, &val); |
420 | if (err < 0) | |
421 | return err; | |
06426adf | 422 | |
29ece8b4 YY |
423 | if (val == BLK_MQ_POLL_CLASSIC) |
424 | q->poll_nsec = BLK_MQ_POLL_CLASSIC; | |
425 | else if (val >= 0) | |
64f1c21e | 426 | q->poll_nsec = val * 1000; |
29ece8b4 YY |
427 | else |
428 | return -EINVAL; | |
64f1c21e JA |
429 | |
430 | return count; | |
06426adf JA |
431 | } |
432 | ||
05229bee JA |
433 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
434 | { | |
435 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
436 | } | |
437 | ||
438 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
439 | size_t count) | |
440 | { | |
a614dd22 | 441 | if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) |
05229bee | 442 | return -EINVAL; |
a614dd22 CH |
443 | pr_info_ratelimited("writes to the poll attribute are ignored.\n"); |
444 | pr_info_ratelimited("please use driver specific parameters instead.\n"); | |
445 | return count; | |
05229bee JA |
446 | } |
447 | ||
65cd1d13 WZ |
448 | static ssize_t queue_io_timeout_show(struct request_queue *q, char *page) |
449 | { | |
450 | return sprintf(page, "%u\n", jiffies_to_msecs(q->rq_timeout)); | |
451 | } | |
452 | ||
453 | static ssize_t queue_io_timeout_store(struct request_queue *q, const char *page, | |
454 | size_t count) | |
455 | { | |
456 | unsigned int val; | |
457 | int err; | |
458 | ||
459 | err = kstrtou32(page, 10, &val); | |
460 | if (err || val == 0) | |
461 | return -EINVAL; | |
462 | ||
463 | blk_queue_rq_timeout(q, msecs_to_jiffies(val)); | |
464 | ||
465 | return count; | |
466 | } | |
467 | ||
87760e5e JA |
468 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
469 | { | |
a7905043 | 470 | if (!wbt_rq_qos(q)) |
87760e5e JA |
471 | return -EINVAL; |
472 | ||
a7905043 | 473 | return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000)); |
87760e5e JA |
474 | } |
475 | ||
476 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
477 | size_t count) | |
478 | { | |
a7905043 | 479 | struct rq_qos *rqos; |
87760e5e | 480 | ssize_t ret; |
80e091d1 | 481 | s64 val; |
87760e5e | 482 | |
87760e5e JA |
483 | ret = queue_var_store64(&val, page); |
484 | if (ret < 0) | |
485 | return ret; | |
d62118b6 JA |
486 | if (val < -1) |
487 | return -EINVAL; | |
488 | ||
a7905043 JB |
489 | rqos = wbt_rq_qos(q); |
490 | if (!rqos) { | |
d62118b6 JA |
491 | ret = wbt_init(q); |
492 | if (ret) | |
493 | return ret; | |
d62118b6 | 494 | } |
87760e5e | 495 | |
80e091d1 | 496 | if (val == -1) |
a7905043 | 497 | val = wbt_default_latency_nsec(q); |
80e091d1 | 498 | else if (val >= 0) |
a7905043 | 499 | val *= 1000ULL; |
d62118b6 | 500 | |
b7143fe6 AZ |
501 | if (wbt_get_min_lat(q) == val) |
502 | return count; | |
503 | ||
c125311d JA |
504 | /* |
505 | * Ensure that the queue is idled, in case the latency update | |
506 | * ends up either enabling or disabling wbt completely. We can't | |
507 | * have IO inflight if that happens. | |
508 | */ | |
a1ce35fa JA |
509 | blk_mq_freeze_queue(q); |
510 | blk_mq_quiesce_queue(q); | |
80e091d1 | 511 | |
c125311d | 512 | wbt_set_min_lat(q, val); |
c125311d | 513 | |
a1ce35fa JA |
514 | blk_mq_unquiesce_queue(q); |
515 | blk_mq_unfreeze_queue(q); | |
c125311d | 516 | |
87760e5e JA |
517 | return count; |
518 | } | |
519 | ||
93e9d8e8 JA |
520 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
521 | { | |
522 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
523 | return sprintf(page, "write back\n"); | |
524 | ||
525 | return sprintf(page, "write through\n"); | |
526 | } | |
527 | ||
528 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
529 | size_t count) | |
530 | { | |
531 | int set = -1; | |
532 | ||
533 | if (!strncmp(page, "write back", 10)) | |
534 | set = 1; | |
535 | else if (!strncmp(page, "write through", 13) || | |
536 | !strncmp(page, "none", 4)) | |
537 | set = 0; | |
538 | ||
539 | if (set == -1) | |
540 | return -EINVAL; | |
541 | ||
93e9d8e8 | 542 | if (set) |
8814ce8a | 543 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
93e9d8e8 | 544 | else |
8814ce8a | 545 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
93e9d8e8 JA |
546 | |
547 | return count; | |
548 | } | |
549 | ||
6fcefbe5 KO |
550 | static ssize_t queue_fua_show(struct request_queue *q, char *page) |
551 | { | |
552 | return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags)); | |
553 | } | |
554 | ||
ea6ca600 YK |
555 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
556 | { | |
557 | return queue_var_show(blk_queue_dax(q), page); | |
558 | } | |
559 | ||
35626147 CH |
560 | #define QUEUE_RO_ENTRY(_prefix, _name) \ |
561 | static struct queue_sysfs_entry _prefix##_entry = { \ | |
562 | .attr = { .name = _name, .mode = 0444 }, \ | |
563 | .show = _prefix##_show, \ | |
564 | }; | |
565 | ||
566 | #define QUEUE_RW_ENTRY(_prefix, _name) \ | |
567 | static struct queue_sysfs_entry _prefix##_entry = { \ | |
568 | .attr = { .name = _name, .mode = 0644 }, \ | |
569 | .show = _prefix##_show, \ | |
570 | .store = _prefix##_store, \ | |
571 | }; | |
572 | ||
573 | QUEUE_RW_ENTRY(queue_requests, "nr_requests"); | |
574 | QUEUE_RW_ENTRY(queue_ra, "read_ahead_kb"); | |
575 | QUEUE_RW_ENTRY(queue_max_sectors, "max_sectors_kb"); | |
576 | QUEUE_RO_ENTRY(queue_max_hw_sectors, "max_hw_sectors_kb"); | |
577 | QUEUE_RO_ENTRY(queue_max_segments, "max_segments"); | |
578 | QUEUE_RO_ENTRY(queue_max_integrity_segments, "max_integrity_segments"); | |
579 | QUEUE_RO_ENTRY(queue_max_segment_size, "max_segment_size"); | |
580 | QUEUE_RW_ENTRY(elv_iosched, "scheduler"); | |
581 | ||
582 | QUEUE_RO_ENTRY(queue_logical_block_size, "logical_block_size"); | |
583 | QUEUE_RO_ENTRY(queue_physical_block_size, "physical_block_size"); | |
584 | QUEUE_RO_ENTRY(queue_chunk_sectors, "chunk_sectors"); | |
585 | QUEUE_RO_ENTRY(queue_io_min, "minimum_io_size"); | |
586 | QUEUE_RO_ENTRY(queue_io_opt, "optimal_io_size"); | |
587 | ||
588 | QUEUE_RO_ENTRY(queue_max_discard_segments, "max_discard_segments"); | |
589 | QUEUE_RO_ENTRY(queue_discard_granularity, "discard_granularity"); | |
590 | QUEUE_RO_ENTRY(queue_discard_max_hw, "discard_max_hw_bytes"); | |
591 | QUEUE_RW_ENTRY(queue_discard_max, "discard_max_bytes"); | |
592 | QUEUE_RO_ENTRY(queue_discard_zeroes_data, "discard_zeroes_data"); | |
593 | ||
594 | QUEUE_RO_ENTRY(queue_write_same_max, "write_same_max_bytes"); | |
595 | QUEUE_RO_ENTRY(queue_write_zeroes_max, "write_zeroes_max_bytes"); | |
596 | QUEUE_RO_ENTRY(queue_zone_append_max, "zone_append_max_bytes"); | |
a805a4fa | 597 | QUEUE_RO_ENTRY(queue_zone_write_granularity, "zone_write_granularity"); |
35626147 CH |
598 | |
599 | QUEUE_RO_ENTRY(queue_zoned, "zoned"); | |
600 | QUEUE_RO_ENTRY(queue_nr_zones, "nr_zones"); | |
601 | QUEUE_RO_ENTRY(queue_max_open_zones, "max_open_zones"); | |
602 | QUEUE_RO_ENTRY(queue_max_active_zones, "max_active_zones"); | |
603 | ||
604 | QUEUE_RW_ENTRY(queue_nomerges, "nomerges"); | |
605 | QUEUE_RW_ENTRY(queue_rq_affinity, "rq_affinity"); | |
606 | QUEUE_RW_ENTRY(queue_poll, "io_poll"); | |
607 | QUEUE_RW_ENTRY(queue_poll_delay, "io_poll_delay"); | |
608 | QUEUE_RW_ENTRY(queue_wc, "write_cache"); | |
609 | QUEUE_RO_ENTRY(queue_fua, "fua"); | |
610 | QUEUE_RO_ENTRY(queue_dax, "dax"); | |
611 | QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout"); | |
612 | QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec"); | |
28af7428 | 613 | QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask"); |
3850e13f | 614 | QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment"); |
8324aa91 | 615 | |
35626147 CH |
616 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
617 | QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time"); | |
618 | #endif | |
8324aa91 | 619 | |
35626147 | 620 | /* legacy alias for logical_block_size: */ |
e68b903c | 621 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
5657a819 | 622 | .attr = {.name = "hw_sector_size", .mode = 0444 }, |
e1defc4f MP |
623 | .show = queue_logical_block_size_show, |
624 | }; | |
625 | ||
fc93fe14 CH |
626 | QUEUE_RW_ENTRY(queue_nonrot, "rotational"); |
627 | QUEUE_RW_ENTRY(queue_iostats, "iostats"); | |
628 | QUEUE_RW_ENTRY(queue_random, "add_random"); | |
1cb039f3 | 629 | QUEUE_RW_ENTRY(queue_stable_writes, "stable_writes"); |
e2e1a148 | 630 | |
4d25339e | 631 | static struct attribute *queue_attrs[] = { |
8324aa91 JA |
632 | &queue_requests_entry.attr, |
633 | &queue_ra_entry.attr, | |
634 | &queue_max_hw_sectors_entry.attr, | |
635 | &queue_max_sectors_entry.attr, | |
c77a5710 | 636 | &queue_max_segments_entry.attr, |
1e739730 | 637 | &queue_max_discard_segments_entry.attr, |
13f05c8d | 638 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 639 | &queue_max_segment_size_entry.attr, |
35626147 | 640 | &elv_iosched_entry.attr, |
e68b903c | 641 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 642 | &queue_logical_block_size_entry.attr, |
c72758f3 | 643 | &queue_physical_block_size_entry.attr, |
87caf97c | 644 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
645 | &queue_io_min_entry.attr, |
646 | &queue_io_opt_entry.attr, | |
86b37281 MP |
647 | &queue_discard_granularity_entry.attr, |
648 | &queue_discard_max_entry.attr, | |
0034af03 | 649 | &queue_discard_max_hw_entry.attr, |
98262f27 | 650 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 651 | &queue_write_same_max_entry.attr, |
a6f0788e | 652 | &queue_write_zeroes_max_entry.attr, |
0512a75b | 653 | &queue_zone_append_max_entry.attr, |
a805a4fa | 654 | &queue_zone_write_granularity_entry.attr, |
1308835f | 655 | &queue_nonrot_entry.attr, |
797476b8 | 656 | &queue_zoned_entry.attr, |
965b652e | 657 | &queue_nr_zones_entry.attr, |
e15864f8 | 658 | &queue_max_open_zones_entry.attr, |
659bf827 | 659 | &queue_max_active_zones_entry.attr, |
ac9fafa1 | 660 | &queue_nomerges_entry.attr, |
c7c22e4d | 661 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 662 | &queue_iostats_entry.attr, |
1cb039f3 | 663 | &queue_stable_writes_entry.attr, |
e2e1a148 | 664 | &queue_random_entry.attr, |
05229bee | 665 | &queue_poll_entry.attr, |
93e9d8e8 | 666 | &queue_wc_entry.attr, |
6fcefbe5 | 667 | &queue_fua_entry.attr, |
ea6ca600 | 668 | &queue_dax_entry.attr, |
87760e5e | 669 | &queue_wb_lat_entry.attr, |
06426adf | 670 | &queue_poll_delay_entry.attr, |
65cd1d13 | 671 | &queue_io_timeout_entry.attr, |
297e3d85 | 672 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
35626147 | 673 | &blk_throtl_sample_time_entry.attr, |
297e3d85 | 674 | #endif |
28af7428 | 675 | &queue_virt_boundary_mask_entry.attr, |
3850e13f | 676 | &queue_dma_alignment_entry.attr, |
8324aa91 JA |
677 | NULL, |
678 | }; | |
679 | ||
4d25339e WZ |
680 | static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr, |
681 | int n) | |
682 | { | |
683 | struct request_queue *q = | |
684 | container_of(kobj, struct request_queue, kobj); | |
685 | ||
686 | if (attr == &queue_io_timeout_entry.attr && | |
687 | (!q->mq_ops || !q->mq_ops->timeout)) | |
688 | return 0; | |
689 | ||
659bf827 NC |
690 | if ((attr == &queue_max_open_zones_entry.attr || |
691 | attr == &queue_max_active_zones_entry.attr) && | |
e15864f8 NC |
692 | !blk_queue_is_zoned(q)) |
693 | return 0; | |
694 | ||
4d25339e WZ |
695 | return attr->mode; |
696 | } | |
697 | ||
698 | static struct attribute_group queue_attr_group = { | |
699 | .attrs = queue_attrs, | |
700 | .is_visible = queue_attr_visible, | |
701 | }; | |
702 | ||
703 | ||
8324aa91 JA |
704 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) |
705 | ||
706 | static ssize_t | |
707 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
708 | { | |
709 | struct queue_sysfs_entry *entry = to_queue(attr); | |
710 | struct request_queue *q = | |
711 | container_of(kobj, struct request_queue, kobj); | |
712 | ssize_t res; | |
713 | ||
714 | if (!entry->show) | |
715 | return -EIO; | |
716 | mutex_lock(&q->sysfs_lock); | |
8324aa91 JA |
717 | res = entry->show(q, page); |
718 | mutex_unlock(&q->sysfs_lock); | |
719 | return res; | |
720 | } | |
721 | ||
722 | static ssize_t | |
723 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
724 | const char *page, size_t length) | |
725 | { | |
726 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 727 | struct request_queue *q; |
8324aa91 JA |
728 | ssize_t res; |
729 | ||
730 | if (!entry->store) | |
731 | return -EIO; | |
6728cb0e JA |
732 | |
733 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 734 | mutex_lock(&q->sysfs_lock); |
8324aa91 JA |
735 | res = entry->store(q, page, length); |
736 | mutex_unlock(&q->sysfs_lock); | |
737 | return res; | |
738 | } | |
739 | ||
548bc8e1 TH |
740 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
741 | { | |
742 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
743 | rcu_head); | |
704b914f ML |
744 | |
745 | kmem_cache_free(blk_get_queue_kmem_cache(blk_queue_has_srcu(q)), q); | |
548bc8e1 TH |
746 | } |
747 | ||
8324aa91 | 748 | /** |
e8c7d14a LC |
749 | * blk_release_queue - releases all allocated resources of the request_queue |
750 | * @kobj: pointer to a kobject, whose container is a request_queue | |
751 | * | |
752 | * This function releases all allocated resources of the request queue. | |
753 | * | |
754 | * The struct request_queue refcount is incremented with blk_get_queue() and | |
755 | * decremented with blk_put_queue(). Once the refcount reaches 0 this function | |
756 | * is called. | |
757 | * | |
e8c7d14a LC |
758 | * Drivers exist which depend on the release of the request_queue to be |
759 | * synchronous, it should not be deferred. | |
760 | * | |
761 | * Context: can sleep | |
dc9edc44 | 762 | */ |
e8c7d14a | 763 | static void blk_release_queue(struct kobject *kobj) |
8324aa91 | 764 | { |
e8c7d14a LC |
765 | struct request_queue *q = |
766 | container_of(kobj, struct request_queue, kobj); | |
767 | ||
768 | might_sleep(); | |
8324aa91 | 769 | |
ba3e8456 ML |
770 | percpu_ref_exit(&q->q_usage_counter); |
771 | ||
48b5c1fb | 772 | if (q->poll_stat) |
34dbad5d OS |
773 | blk_stat_remove_callback(q, q->poll_cb); |
774 | blk_stat_free_callback(q->poll_cb); | |
777eb1bf | 775 | |
34dbad5d | 776 | blk_free_queue_stats(q->stats); |
48b5c1fb | 777 | kfree(q->poll_stat); |
34dbad5d | 778 | |
344e9ffc | 779 | if (queue_is_mq(q)) |
e09aae7e | 780 | blk_mq_release(q); |
18741986 | 781 | |
850fd2ab ML |
782 | if (blk_queue_has_srcu(q)) |
783 | cleanup_srcu_struct(q->srcu); | |
784 | ||
798f2a6f | 785 | ida_free(&blk_queue_ida, q->id); |
548bc8e1 | 786 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
787 | } |
788 | ||
52cf25d0 | 789 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
790 | .show = queue_attr_show, |
791 | .store = queue_attr_store, | |
792 | }; | |
793 | ||
4a8d14bb CH |
794 | static const struct attribute_group *blk_queue_attr_groups[] = { |
795 | &queue_attr_group, | |
796 | NULL | |
797 | }; | |
798 | ||
8324aa91 | 799 | struct kobj_type blk_queue_ktype = { |
4a8d14bb | 800 | .default_groups = blk_queue_attr_groups, |
8324aa91 | 801 | .sysfs_ops = &queue_sysfs_ops, |
8324aa91 JA |
802 | .release = blk_release_queue, |
803 | }; | |
804 | ||
2c2086af BVA |
805 | /** |
806 | * blk_register_queue - register a block layer queue with sysfs | |
807 | * @disk: Disk of which the request queue should be registered with sysfs. | |
808 | */ | |
8324aa91 JA |
809 | int blk_register_queue(struct gendisk *disk) |
810 | { | |
8324aa91 | 811 | struct request_queue *q = disk->queue; |
8682b92e | 812 | int ret; |
8324aa91 | 813 | |
cecf5d87 | 814 | mutex_lock(&q->sysfs_dir_lock); |
b410aff2 | 815 | |
8682b92e | 816 | ret = kobject_add(&q->kobj, &disk_to_dev(disk)->kobj, "queue"); |
cc5c516d | 817 | if (ret < 0) |
b410aff2 | 818 | goto unlock; |
8324aa91 | 819 | |
5cf9c91b | 820 | if (queue_is_mq(q)) |
8682b92e | 821 | blk_mq_sysfs_register(disk); |
5cf9c91b CH |
822 | mutex_lock(&q->sysfs_lock); |
823 | ||
85e0cbbb LC |
824 | mutex_lock(&q->debugfs_mutex); |
825 | q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent), | |
826 | blk_debugfs_root); | |
5cf9c91b | 827 | if (queue_is_mq(q)) |
a8ecdd71 | 828 | blk_mq_debugfs_register(q); |
5cf9c91b | 829 | mutex_unlock(&q->debugfs_mutex); |
a2247f19 | 830 | |
22d0c408 | 831 | ret = disk_register_independent_access_ranges(disk); |
a2247f19 DLM |
832 | if (ret) |
833 | goto put_dev; | |
834 | ||
344e9ffc | 835 | if (q->elevator) { |
cecf5d87 | 836 | ret = elv_register_queue(q, false); |
a2247f19 DLM |
837 | if (ret) |
838 | goto put_dev; | |
8324aa91 | 839 | } |
cecf5d87 | 840 | |
20f01f16 EB |
841 | ret = blk_crypto_sysfs_register(q); |
842 | if (ret) | |
843 | goto put_dev; | |
844 | ||
cecf5d87 ML |
845 | blk_queue_flag_set(QUEUE_FLAG_REGISTERED, q); |
846 | wbt_enable_default(q); | |
5f6dc752 | 847 | blk_throtl_register(disk); |
cecf5d87 ML |
848 | |
849 | /* Now everything is ready and send out KOBJ_ADD uevent */ | |
850 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
0546858c | 851 | if (q->elevator) |
cecf5d87 ML |
852 | kobject_uevent(&q->elevator->kobj, KOBJ_ADD); |
853 | mutex_unlock(&q->sysfs_lock); | |
854 | ||
b410aff2 | 855 | unlock: |
cecf5d87 | 856 | mutex_unlock(&q->sysfs_dir_lock); |
a72c374f ML |
857 | |
858 | /* | |
859 | * SCSI probing may synchronously create and destroy a lot of | |
860 | * request_queues for non-existent devices. Shutting down a fully | |
861 | * functional queue takes measureable wallclock time as RCU grace | |
862 | * periods are involved. To avoid excessive latency in these | |
863 | * cases, a request_queue starts out in a degraded mode which is | |
864 | * faster to shut down and is made fully functional here as | |
865 | * request_queues for non-existent devices never get registered. | |
866 | */ | |
867 | if (!blk_queue_init_done(q)) { | |
868 | blk_queue_flag_set(QUEUE_FLAG_INIT_DONE, q); | |
869 | percpu_ref_switch_to_percpu(&q->q_usage_counter); | |
870 | } | |
871 | ||
a2247f19 DLM |
872 | return ret; |
873 | ||
874 | put_dev: | |
20f01f16 | 875 | elv_unregister_queue(q); |
a2247f19 DLM |
876 | disk_unregister_independent_access_ranges(disk); |
877 | mutex_unlock(&q->sysfs_lock); | |
878 | mutex_unlock(&q->sysfs_dir_lock); | |
879 | kobject_del(&q->kobj); | |
a2247f19 | 880 | |
b410aff2 | 881 | return ret; |
8324aa91 JA |
882 | } |
883 | ||
2c2086af BVA |
884 | /** |
885 | * blk_unregister_queue - counterpart of blk_register_queue() | |
886 | * @disk: Disk of which the request queue should be unregistered from sysfs. | |
887 | * | |
888 | * Note: the caller is responsible for guaranteeing that this function is called | |
889 | * after blk_register_queue() has finished. | |
890 | */ | |
8324aa91 JA |
891 | void blk_unregister_queue(struct gendisk *disk) |
892 | { | |
893 | struct request_queue *q = disk->queue; | |
894 | ||
fb199746 AM |
895 | if (WARN_ON(!q)) |
896 | return; | |
897 | ||
fa70d2e2 | 898 | /* Return early if disk->queue was never registered. */ |
58c898ba | 899 | if (!blk_queue_registered(q)) |
fa70d2e2 MS |
900 | return; |
901 | ||
667257e8 | 902 | /* |
2c2086af BVA |
903 | * Since sysfs_remove_dir() prevents adding new directory entries |
904 | * before removal of existing entries starts, protect against | |
905 | * concurrent elv_iosched_store() calls. | |
667257e8 | 906 | */ |
e9a823fb | 907 | mutex_lock(&q->sysfs_lock); |
8814ce8a | 908 | blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q); |
cecf5d87 | 909 | mutex_unlock(&q->sysfs_lock); |
02ba8893 | 910 | |
cecf5d87 | 911 | mutex_lock(&q->sysfs_dir_lock); |
2c2086af BVA |
912 | /* |
913 | * Remove the sysfs attributes before unregistering the queue data | |
914 | * structures that can be modified through sysfs. | |
915 | */ | |
344e9ffc | 916 | if (queue_is_mq(q)) |
8682b92e | 917 | blk_mq_sysfs_unregister(disk); |
20f01f16 | 918 | blk_crypto_sysfs_unregister(q); |
667257e8 | 919 | |
b89f625e | 920 | mutex_lock(&q->sysfs_lock); |
f5ec592d | 921 | elv_unregister_queue(q); |
a2247f19 | 922 | disk_unregister_independent_access_ranges(disk); |
b89f625e | 923 | mutex_unlock(&q->sysfs_lock); |
0f692882 EB |
924 | |
925 | /* Now that we've deleted all child objects, we can delete the queue. */ | |
926 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
927 | kobject_del(&q->kobj); | |
cecf5d87 | 928 | mutex_unlock(&q->sysfs_dir_lock); |
2c2086af | 929 | |
99d055b4 CH |
930 | mutex_lock(&q->debugfs_mutex); |
931 | blk_trace_shutdown(q); | |
932 | debugfs_remove_recursive(q->debugfs_dir); | |
933 | q->debugfs_dir = NULL; | |
934 | q->sched_debugfs_dir = NULL; | |
935 | q->rqos_debugfs_dir = NULL; | |
936 | mutex_unlock(&q->debugfs_mutex); | |
8324aa91 | 937 | } |