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> |
8324aa91 JA |
14 | |
15 | #include "blk.h" | |
3edcc0ce | 16 | #include "blk-mq.h" |
d173a251 | 17 | #include "blk-mq-debugfs.h" |
87760e5e | 18 | #include "blk-wbt.h" |
8324aa91 JA |
19 | |
20 | struct queue_sysfs_entry { | |
21 | struct attribute attr; | |
22 | ssize_t (*show)(struct request_queue *, char *); | |
23 | ssize_t (*store)(struct request_queue *, const char *, size_t); | |
24 | }; | |
25 | ||
26 | static ssize_t | |
9cb308ce | 27 | queue_var_show(unsigned long var, char *page) |
8324aa91 | 28 | { |
9cb308ce | 29 | return sprintf(page, "%lu\n", var); |
8324aa91 JA |
30 | } |
31 | ||
32 | static ssize_t | |
33 | queue_var_store(unsigned long *var, const char *page, size_t count) | |
34 | { | |
b1f3b64d DR |
35 | int err; |
36 | unsigned long v; | |
37 | ||
ed751e68 | 38 | err = kstrtoul(page, 10, &v); |
b1f3b64d DR |
39 | if (err || v > UINT_MAX) |
40 | return -EINVAL; | |
41 | ||
42 | *var = v; | |
8324aa91 | 43 | |
8324aa91 JA |
44 | return count; |
45 | } | |
46 | ||
80e091d1 | 47 | static ssize_t queue_var_store64(s64 *var, const char *page) |
87760e5e JA |
48 | { |
49 | int err; | |
80e091d1 | 50 | s64 v; |
87760e5e | 51 | |
80e091d1 | 52 | err = kstrtos64(page, 10, &v); |
87760e5e JA |
53 | if (err < 0) |
54 | return err; | |
55 | ||
56 | *var = v; | |
57 | return 0; | |
58 | } | |
59 | ||
8324aa91 JA |
60 | static ssize_t queue_requests_show(struct request_queue *q, char *page) |
61 | { | |
62 | return queue_var_show(q->nr_requests, (page)); | |
63 | } | |
64 | ||
65 | static ssize_t | |
66 | queue_requests_store(struct request_queue *q, const char *page, size_t count) | |
67 | { | |
8324aa91 | 68 | unsigned long nr; |
e3a2b3f9 | 69 | int ret, err; |
b8a9ae77 | 70 | |
e3a2b3f9 | 71 | if (!q->request_fn && !q->mq_ops) |
b8a9ae77 JA |
72 | return -EINVAL; |
73 | ||
74 | ret = queue_var_store(&nr, page, count); | |
b1f3b64d DR |
75 | if (ret < 0) |
76 | return ret; | |
77 | ||
8324aa91 JA |
78 | if (nr < BLKDEV_MIN_RQ) |
79 | nr = BLKDEV_MIN_RQ; | |
80 | ||
e3a2b3f9 JA |
81 | if (q->request_fn) |
82 | err = blk_update_nr_requests(q, nr); | |
83 | else | |
84 | err = blk_mq_update_nr_requests(q, nr); | |
85 | ||
86 | if (err) | |
87 | return err; | |
88 | ||
8324aa91 JA |
89 | return ret; |
90 | } | |
91 | ||
92 | static ssize_t queue_ra_show(struct request_queue *q, char *page) | |
93 | { | |
dc3b17cc | 94 | unsigned long ra_kb = q->backing_dev_info->ra_pages << |
09cbfeaf | 95 | (PAGE_SHIFT - 10); |
8324aa91 JA |
96 | |
97 | return queue_var_show(ra_kb, (page)); | |
98 | } | |
99 | ||
100 | static ssize_t | |
101 | queue_ra_store(struct request_queue *q, const char *page, size_t count) | |
102 | { | |
103 | unsigned long ra_kb; | |
104 | ssize_t ret = queue_var_store(&ra_kb, page, count); | |
105 | ||
b1f3b64d DR |
106 | if (ret < 0) |
107 | return ret; | |
108 | ||
dc3b17cc | 109 | q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
110 | |
111 | return ret; | |
112 | } | |
113 | ||
114 | static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) | |
115 | { | |
ae03bf63 | 116 | int max_sectors_kb = queue_max_sectors(q) >> 1; |
8324aa91 JA |
117 | |
118 | return queue_var_show(max_sectors_kb, (page)); | |
119 | } | |
120 | ||
c77a5710 MP |
121 | static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
122 | { | |
123 | return queue_var_show(queue_max_segments(q), (page)); | |
124 | } | |
125 | ||
1e739730 CH |
126 | static ssize_t queue_max_discard_segments_show(struct request_queue *q, |
127 | char *page) | |
128 | { | |
129 | return queue_var_show(queue_max_discard_segments(q), (page)); | |
130 | } | |
131 | ||
13f05c8d MP |
132 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
133 | { | |
134 | return queue_var_show(q->limits.max_integrity_segments, (page)); | |
135 | } | |
136 | ||
c77a5710 MP |
137 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
138 | { | |
e692cb66 | 139 | if (blk_queue_cluster(q)) |
c77a5710 MP |
140 | return queue_var_show(queue_max_segment_size(q), (page)); |
141 | ||
09cbfeaf | 142 | return queue_var_show(PAGE_SIZE, (page)); |
c77a5710 MP |
143 | } |
144 | ||
e1defc4f | 145 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 146 | { |
e1defc4f | 147 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
148 | } |
149 | ||
c72758f3 MP |
150 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
151 | { | |
152 | return queue_var_show(queue_physical_block_size(q), page); | |
153 | } | |
154 | ||
87caf97c HR |
155 | static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
156 | { | |
157 | return queue_var_show(q->limits.chunk_sectors, page); | |
158 | } | |
159 | ||
c72758f3 MP |
160 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
161 | { | |
162 | return queue_var_show(queue_io_min(q), page); | |
163 | } | |
164 | ||
165 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
166 | { | |
167 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
168 | } |
169 | ||
86b37281 MP |
170 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
171 | { | |
172 | return queue_var_show(q->limits.discard_granularity, page); | |
173 | } | |
174 | ||
0034af03 JA |
175 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
176 | { | |
0034af03 | 177 | |
18f922d0 A |
178 | return sprintf(page, "%llu\n", |
179 | (unsigned long long)q->limits.max_hw_discard_sectors << 9); | |
0034af03 JA |
180 | } |
181 | ||
86b37281 MP |
182 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
183 | { | |
a934a00a MP |
184 | return sprintf(page, "%llu\n", |
185 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
186 | } |
187 | ||
0034af03 JA |
188 | static ssize_t queue_discard_max_store(struct request_queue *q, |
189 | const char *page, size_t count) | |
190 | { | |
191 | unsigned long max_discard; | |
192 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
193 | ||
194 | if (ret < 0) | |
195 | return ret; | |
196 | ||
197 | if (max_discard & (q->limits.discard_granularity - 1)) | |
198 | return -EINVAL; | |
199 | ||
200 | max_discard >>= 9; | |
201 | if (max_discard > UINT_MAX) | |
202 | return -EINVAL; | |
203 | ||
204 | if (max_discard > q->limits.max_hw_discard_sectors) | |
205 | max_discard = q->limits.max_hw_discard_sectors; | |
206 | ||
207 | q->limits.max_discard_sectors = max_discard; | |
208 | return ret; | |
209 | } | |
210 | ||
98262f27 MP |
211 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
212 | { | |
48920ff2 | 213 | return queue_var_show(0, page); |
98262f27 MP |
214 | } |
215 | ||
4363ac7c MP |
216 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
217 | { | |
218 | return sprintf(page, "%llu\n", | |
219 | (unsigned long long)q->limits.max_write_same_sectors << 9); | |
220 | } | |
221 | ||
a6f0788e CK |
222 | static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
223 | { | |
224 | return sprintf(page, "%llu\n", | |
225 | (unsigned long long)q->limits.max_write_zeroes_sectors << 9); | |
226 | } | |
4363ac7c | 227 | |
8324aa91 JA |
228 | static ssize_t |
229 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
230 | { | |
231 | unsigned long max_sectors_kb, | |
ae03bf63 | 232 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 233 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
234 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
235 | ||
b1f3b64d DR |
236 | if (ret < 0) |
237 | return ret; | |
238 | ||
ca369d51 MP |
239 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
240 | q->limits.max_dev_sectors >> 1); | |
241 | ||
8324aa91 JA |
242 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
243 | return -EINVAL; | |
7c239517 | 244 | |
8324aa91 | 245 | spin_lock_irq(q->queue_lock); |
c295fc05 | 246 | q->limits.max_sectors = max_sectors_kb << 1; |
dc3b17cc | 247 | q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
248 | spin_unlock_irq(q->queue_lock); |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
254 | { | |
ae03bf63 | 255 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
256 | |
257 | return queue_var_show(max_hw_sectors_kb, (page)); | |
258 | } | |
259 | ||
956bcb7c JA |
260 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
261 | static ssize_t \ | |
262 | queue_show_##name(struct request_queue *q, char *page) \ | |
263 | { \ | |
264 | int bit; \ | |
265 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
266 | return queue_var_show(neg ? !bit : bit, page); \ | |
267 | } \ | |
268 | static ssize_t \ | |
269 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
270 | { \ | |
271 | unsigned long val; \ | |
272 | ssize_t ret; \ | |
273 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
274 | if (ret < 0) \ |
275 | return ret; \ | |
956bcb7c JA |
276 | if (neg) \ |
277 | val = !val; \ | |
278 | \ | |
279 | spin_lock_irq(q->queue_lock); \ | |
280 | if (val) \ | |
281 | queue_flag_set(QUEUE_FLAG_##flag, q); \ | |
282 | else \ | |
283 | queue_flag_clear(QUEUE_FLAG_##flag, q); \ | |
284 | spin_unlock_irq(q->queue_lock); \ | |
285 | return ret; \ | |
1308835f BZ |
286 | } |
287 | ||
956bcb7c JA |
288 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
289 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
290 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
291 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 292 | |
797476b8 DLM |
293 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
294 | { | |
295 | switch (blk_queue_zoned_model(q)) { | |
296 | case BLK_ZONED_HA: | |
297 | return sprintf(page, "host-aware\n"); | |
298 | case BLK_ZONED_HM: | |
299 | return sprintf(page, "host-managed\n"); | |
300 | default: | |
301 | return sprintf(page, "none\n"); | |
302 | } | |
303 | } | |
304 | ||
ac9fafa1 AB |
305 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
306 | { | |
488991e2 AB |
307 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
308 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
309 | } |
310 | ||
311 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
312 | size_t count) | |
313 | { | |
314 | unsigned long nm; | |
315 | ssize_t ret = queue_var_store(&nm, page, count); | |
316 | ||
b1f3b64d DR |
317 | if (ret < 0) |
318 | return ret; | |
319 | ||
bf0f9702 | 320 | spin_lock_irq(q->queue_lock); |
488991e2 AB |
321 | queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
322 | queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
323 | if (nm == 2) | |
bf0f9702 | 324 | queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 AB |
325 | else if (nm) |
326 | queue_flag_set(QUEUE_FLAG_NOXMERGES, q); | |
bf0f9702 | 327 | spin_unlock_irq(q->queue_lock); |
1308835f | 328 | |
ac9fafa1 AB |
329 | return ret; |
330 | } | |
331 | ||
c7c22e4d JA |
332 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
333 | { | |
9cb308ce | 334 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 335 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 336 | |
5757a6d7 | 337 | return queue_var_show(set << force, page); |
c7c22e4d JA |
338 | } |
339 | ||
340 | static ssize_t | |
341 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
342 | { | |
343 | ssize_t ret = -EINVAL; | |
0a06ff06 | 344 | #ifdef CONFIG_SMP |
c7c22e4d JA |
345 | unsigned long val; |
346 | ||
347 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
348 | if (ret < 0) |
349 | return ret; | |
350 | ||
c7c22e4d | 351 | spin_lock_irq(q->queue_lock); |
e8037d49 | 352 | if (val == 2) { |
c7c22e4d | 353 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
e8037d49 ES |
354 | queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
355 | } else if (val == 1) { | |
356 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); | |
357 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
358 | } else if (val == 0) { | |
5757a6d7 DW |
359 | queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
360 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
361 | } | |
c7c22e4d JA |
362 | spin_unlock_irq(q->queue_lock); |
363 | #endif | |
364 | return ret; | |
365 | } | |
8324aa91 | 366 | |
06426adf JA |
367 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
368 | { | |
64f1c21e JA |
369 | int val; |
370 | ||
371 | if (q->poll_nsec == -1) | |
372 | val = -1; | |
373 | else | |
374 | val = q->poll_nsec / 1000; | |
375 | ||
376 | return sprintf(page, "%d\n", val); | |
06426adf JA |
377 | } |
378 | ||
379 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
380 | size_t count) | |
381 | { | |
64f1c21e | 382 | int err, val; |
06426adf JA |
383 | |
384 | if (!q->mq_ops || !q->mq_ops->poll) | |
385 | return -EINVAL; | |
386 | ||
64f1c21e JA |
387 | err = kstrtoint(page, 10, &val); |
388 | if (err < 0) | |
389 | return err; | |
06426adf | 390 | |
64f1c21e JA |
391 | if (val == -1) |
392 | q->poll_nsec = -1; | |
393 | else | |
394 | q->poll_nsec = val * 1000; | |
395 | ||
396 | return count; | |
06426adf JA |
397 | } |
398 | ||
05229bee JA |
399 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
400 | { | |
401 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
402 | } | |
403 | ||
404 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
405 | size_t count) | |
406 | { | |
407 | unsigned long poll_on; | |
408 | ssize_t ret; | |
409 | ||
410 | if (!q->mq_ops || !q->mq_ops->poll) | |
411 | return -EINVAL; | |
412 | ||
413 | ret = queue_var_store(&poll_on, page, count); | |
414 | if (ret < 0) | |
415 | return ret; | |
416 | ||
417 | spin_lock_irq(q->queue_lock); | |
418 | if (poll_on) | |
419 | queue_flag_set(QUEUE_FLAG_POLL, q); | |
420 | else | |
421 | queue_flag_clear(QUEUE_FLAG_POLL, q); | |
422 | spin_unlock_irq(q->queue_lock); | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
87760e5e JA |
427 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
428 | { | |
429 | if (!q->rq_wb) | |
430 | return -EINVAL; | |
431 | ||
432 | return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000)); | |
433 | } | |
434 | ||
435 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
436 | size_t count) | |
437 | { | |
80e091d1 | 438 | struct rq_wb *rwb; |
87760e5e | 439 | ssize_t ret; |
80e091d1 | 440 | s64 val; |
87760e5e | 441 | |
87760e5e JA |
442 | ret = queue_var_store64(&val, page); |
443 | if (ret < 0) | |
444 | return ret; | |
d62118b6 JA |
445 | if (val < -1) |
446 | return -EINVAL; | |
447 | ||
448 | rwb = q->rq_wb; | |
449 | if (!rwb) { | |
450 | ret = wbt_init(q); | |
451 | if (ret) | |
452 | return ret; | |
453 | ||
454 | rwb = q->rq_wb; | |
455 | if (!rwb) | |
456 | return -EINVAL; | |
457 | } | |
87760e5e | 458 | |
80e091d1 JA |
459 | if (val == -1) |
460 | rwb->min_lat_nsec = wbt_default_latency_nsec(q); | |
461 | else if (val >= 0) | |
462 | rwb->min_lat_nsec = val * 1000ULL; | |
d62118b6 JA |
463 | |
464 | if (rwb->enable_state == WBT_STATE_ON_DEFAULT) | |
465 | rwb->enable_state = WBT_STATE_ON_MANUAL; | |
80e091d1 JA |
466 | |
467 | wbt_update_limits(rwb); | |
87760e5e JA |
468 | return count; |
469 | } | |
470 | ||
93e9d8e8 JA |
471 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
472 | { | |
473 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
474 | return sprintf(page, "write back\n"); | |
475 | ||
476 | return sprintf(page, "write through\n"); | |
477 | } | |
478 | ||
479 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
480 | size_t count) | |
481 | { | |
482 | int set = -1; | |
483 | ||
484 | if (!strncmp(page, "write back", 10)) | |
485 | set = 1; | |
486 | else if (!strncmp(page, "write through", 13) || | |
487 | !strncmp(page, "none", 4)) | |
488 | set = 0; | |
489 | ||
490 | if (set == -1) | |
491 | return -EINVAL; | |
492 | ||
493 | spin_lock_irq(q->queue_lock); | |
494 | if (set) | |
495 | queue_flag_set(QUEUE_FLAG_WC, q); | |
496 | else | |
497 | queue_flag_clear(QUEUE_FLAG_WC, q); | |
498 | spin_unlock_irq(q->queue_lock); | |
499 | ||
500 | return count; | |
501 | } | |
502 | ||
ea6ca600 YK |
503 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
504 | { | |
505 | return queue_var_show(blk_queue_dax(q), page); | |
506 | } | |
507 | ||
8324aa91 JA |
508 | static struct queue_sysfs_entry queue_requests_entry = { |
509 | .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, | |
510 | .show = queue_requests_show, | |
511 | .store = queue_requests_store, | |
512 | }; | |
513 | ||
514 | static struct queue_sysfs_entry queue_ra_entry = { | |
515 | .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, | |
516 | .show = queue_ra_show, | |
517 | .store = queue_ra_store, | |
518 | }; | |
519 | ||
520 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
521 | .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, | |
522 | .show = queue_max_sectors_show, | |
523 | .store = queue_max_sectors_store, | |
524 | }; | |
525 | ||
526 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
527 | .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO }, | |
528 | .show = queue_max_hw_sectors_show, | |
529 | }; | |
530 | ||
c77a5710 MP |
531 | static struct queue_sysfs_entry queue_max_segments_entry = { |
532 | .attr = {.name = "max_segments", .mode = S_IRUGO }, | |
533 | .show = queue_max_segments_show, | |
534 | }; | |
535 | ||
1e739730 CH |
536 | static struct queue_sysfs_entry queue_max_discard_segments_entry = { |
537 | .attr = {.name = "max_discard_segments", .mode = S_IRUGO }, | |
538 | .show = queue_max_discard_segments_show, | |
539 | }; | |
540 | ||
13f05c8d MP |
541 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
542 | .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, | |
543 | .show = queue_max_integrity_segments_show, | |
544 | }; | |
545 | ||
c77a5710 MP |
546 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
547 | .attr = {.name = "max_segment_size", .mode = S_IRUGO }, | |
548 | .show = queue_max_segment_size_show, | |
549 | }; | |
550 | ||
8324aa91 JA |
551 | static struct queue_sysfs_entry queue_iosched_entry = { |
552 | .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, | |
553 | .show = elv_iosched_show, | |
554 | .store = elv_iosched_store, | |
555 | }; | |
556 | ||
e68b903c MP |
557 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
558 | .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, | |
e1defc4f MP |
559 | .show = queue_logical_block_size_show, |
560 | }; | |
561 | ||
562 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
563 | .attr = {.name = "logical_block_size", .mode = S_IRUGO }, | |
564 | .show = queue_logical_block_size_show, | |
e68b903c MP |
565 | }; |
566 | ||
c72758f3 MP |
567 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
568 | .attr = {.name = "physical_block_size", .mode = S_IRUGO }, | |
569 | .show = queue_physical_block_size_show, | |
570 | }; | |
571 | ||
87caf97c HR |
572 | static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
573 | .attr = {.name = "chunk_sectors", .mode = S_IRUGO }, | |
574 | .show = queue_chunk_sectors_show, | |
575 | }; | |
576 | ||
c72758f3 MP |
577 | static struct queue_sysfs_entry queue_io_min_entry = { |
578 | .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, | |
579 | .show = queue_io_min_show, | |
580 | }; | |
581 | ||
582 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
583 | .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, | |
584 | .show = queue_io_opt_show, | |
e68b903c MP |
585 | }; |
586 | ||
86b37281 MP |
587 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
588 | .attr = {.name = "discard_granularity", .mode = S_IRUGO }, | |
589 | .show = queue_discard_granularity_show, | |
590 | }; | |
591 | ||
0034af03 JA |
592 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
593 | .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, | |
594 | .show = queue_discard_max_hw_show, | |
595 | }; | |
596 | ||
86b37281 | 597 | static struct queue_sysfs_entry queue_discard_max_entry = { |
0034af03 | 598 | .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
86b37281 | 599 | .show = queue_discard_max_show, |
0034af03 | 600 | .store = queue_discard_max_store, |
86b37281 MP |
601 | }; |
602 | ||
98262f27 MP |
603 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
604 | .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, | |
605 | .show = queue_discard_zeroes_data_show, | |
606 | }; | |
607 | ||
4363ac7c MP |
608 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
609 | .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, | |
610 | .show = queue_write_same_max_show, | |
611 | }; | |
612 | ||
a6f0788e CK |
613 | static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
614 | .attr = {.name = "write_zeroes_max_bytes", .mode = S_IRUGO }, | |
615 | .show = queue_write_zeroes_max_show, | |
616 | }; | |
617 | ||
1308835f BZ |
618 | static struct queue_sysfs_entry queue_nonrot_entry = { |
619 | .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
620 | .show = queue_show_nonrot, |
621 | .store = queue_store_nonrot, | |
1308835f BZ |
622 | }; |
623 | ||
797476b8 DLM |
624 | static struct queue_sysfs_entry queue_zoned_entry = { |
625 | .attr = {.name = "zoned", .mode = S_IRUGO }, | |
626 | .show = queue_zoned_show, | |
627 | }; | |
628 | ||
ac9fafa1 AB |
629 | static struct queue_sysfs_entry queue_nomerges_entry = { |
630 | .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, | |
631 | .show = queue_nomerges_show, | |
632 | .store = queue_nomerges_store, | |
633 | }; | |
634 | ||
c7c22e4d JA |
635 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
636 | .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, | |
637 | .show = queue_rq_affinity_show, | |
638 | .store = queue_rq_affinity_store, | |
639 | }; | |
640 | ||
bc58ba94 JA |
641 | static struct queue_sysfs_entry queue_iostats_entry = { |
642 | .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
643 | .show = queue_show_iostats, |
644 | .store = queue_store_iostats, | |
bc58ba94 JA |
645 | }; |
646 | ||
e2e1a148 JA |
647 | static struct queue_sysfs_entry queue_random_entry = { |
648 | .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
649 | .show = queue_show_random, |
650 | .store = queue_store_random, | |
e2e1a148 JA |
651 | }; |
652 | ||
05229bee JA |
653 | static struct queue_sysfs_entry queue_poll_entry = { |
654 | .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, | |
655 | .show = queue_poll_show, | |
656 | .store = queue_poll_store, | |
657 | }; | |
658 | ||
06426adf JA |
659 | static struct queue_sysfs_entry queue_poll_delay_entry = { |
660 | .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR }, | |
661 | .show = queue_poll_delay_show, | |
662 | .store = queue_poll_delay_store, | |
663 | }; | |
664 | ||
93e9d8e8 JA |
665 | static struct queue_sysfs_entry queue_wc_entry = { |
666 | .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR }, | |
667 | .show = queue_wc_show, | |
668 | .store = queue_wc_store, | |
669 | }; | |
670 | ||
ea6ca600 YK |
671 | static struct queue_sysfs_entry queue_dax_entry = { |
672 | .attr = {.name = "dax", .mode = S_IRUGO }, | |
673 | .show = queue_dax_show, | |
674 | }; | |
675 | ||
87760e5e JA |
676 | static struct queue_sysfs_entry queue_wb_lat_entry = { |
677 | .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR }, | |
678 | .show = queue_wb_lat_show, | |
679 | .store = queue_wb_lat_store, | |
680 | }; | |
681 | ||
297e3d85 SL |
682 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
683 | static struct queue_sysfs_entry throtl_sample_time_entry = { | |
684 | .attr = {.name = "throttle_sample_time", .mode = S_IRUGO | S_IWUSR }, | |
685 | .show = blk_throtl_sample_time_show, | |
686 | .store = blk_throtl_sample_time_store, | |
687 | }; | |
688 | #endif | |
689 | ||
8324aa91 JA |
690 | static struct attribute *default_attrs[] = { |
691 | &queue_requests_entry.attr, | |
692 | &queue_ra_entry.attr, | |
693 | &queue_max_hw_sectors_entry.attr, | |
694 | &queue_max_sectors_entry.attr, | |
c77a5710 | 695 | &queue_max_segments_entry.attr, |
1e739730 | 696 | &queue_max_discard_segments_entry.attr, |
13f05c8d | 697 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 698 | &queue_max_segment_size_entry.attr, |
8324aa91 | 699 | &queue_iosched_entry.attr, |
e68b903c | 700 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 701 | &queue_logical_block_size_entry.attr, |
c72758f3 | 702 | &queue_physical_block_size_entry.attr, |
87caf97c | 703 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
704 | &queue_io_min_entry.attr, |
705 | &queue_io_opt_entry.attr, | |
86b37281 MP |
706 | &queue_discard_granularity_entry.attr, |
707 | &queue_discard_max_entry.attr, | |
0034af03 | 708 | &queue_discard_max_hw_entry.attr, |
98262f27 | 709 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 710 | &queue_write_same_max_entry.attr, |
a6f0788e | 711 | &queue_write_zeroes_max_entry.attr, |
1308835f | 712 | &queue_nonrot_entry.attr, |
797476b8 | 713 | &queue_zoned_entry.attr, |
ac9fafa1 | 714 | &queue_nomerges_entry.attr, |
c7c22e4d | 715 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 716 | &queue_iostats_entry.attr, |
e2e1a148 | 717 | &queue_random_entry.attr, |
05229bee | 718 | &queue_poll_entry.attr, |
93e9d8e8 | 719 | &queue_wc_entry.attr, |
ea6ca600 | 720 | &queue_dax_entry.attr, |
87760e5e | 721 | &queue_wb_lat_entry.attr, |
06426adf | 722 | &queue_poll_delay_entry.attr, |
297e3d85 SL |
723 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
724 | &throtl_sample_time_entry.attr, | |
725 | #endif | |
8324aa91 JA |
726 | NULL, |
727 | }; | |
728 | ||
729 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) | |
730 | ||
731 | static ssize_t | |
732 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
733 | { | |
734 | struct queue_sysfs_entry *entry = to_queue(attr); | |
735 | struct request_queue *q = | |
736 | container_of(kobj, struct request_queue, kobj); | |
737 | ssize_t res; | |
738 | ||
739 | if (!entry->show) | |
740 | return -EIO; | |
741 | mutex_lock(&q->sysfs_lock); | |
3f3299d5 | 742 | if (blk_queue_dying(q)) { |
8324aa91 JA |
743 | mutex_unlock(&q->sysfs_lock); |
744 | return -ENOENT; | |
745 | } | |
746 | res = entry->show(q, page); | |
747 | mutex_unlock(&q->sysfs_lock); | |
748 | return res; | |
749 | } | |
750 | ||
751 | static ssize_t | |
752 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
753 | const char *page, size_t length) | |
754 | { | |
755 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 756 | struct request_queue *q; |
8324aa91 JA |
757 | ssize_t res; |
758 | ||
759 | if (!entry->store) | |
760 | return -EIO; | |
6728cb0e JA |
761 | |
762 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 763 | mutex_lock(&q->sysfs_lock); |
3f3299d5 | 764 | if (blk_queue_dying(q)) { |
8324aa91 JA |
765 | mutex_unlock(&q->sysfs_lock); |
766 | return -ENOENT; | |
767 | } | |
768 | res = entry->store(q, page, length); | |
769 | mutex_unlock(&q->sysfs_lock); | |
770 | return res; | |
771 | } | |
772 | ||
548bc8e1 TH |
773 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
774 | { | |
775 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
776 | rcu_head); | |
777 | kmem_cache_free(blk_requestq_cachep, q); | |
778 | } | |
779 | ||
8324aa91 | 780 | /** |
dc9edc44 BVA |
781 | * __blk_release_queue - release a request queue when it is no longer needed |
782 | * @work: pointer to the release_work member of the request queue to be released | |
8324aa91 JA |
783 | * |
784 | * Description: | |
dc9edc44 BVA |
785 | * blk_release_queue is the counterpart of blk_init_queue(). It should be |
786 | * called when a request queue is being released; typically when a block | |
787 | * device is being de-registered. Its primary task it to free the queue | |
788 | * itself. | |
8324aa91 | 789 | * |
dc9edc44 | 790 | * Notes: |
45a9c9d9 BVA |
791 | * The low level driver must have finished any outstanding requests first |
792 | * via blk_cleanup_queue(). | |
dc9edc44 BVA |
793 | * |
794 | * Although blk_release_queue() may be called with preemption disabled, | |
795 | * __blk_release_queue() may sleep. | |
796 | */ | |
797 | static void __blk_release_queue(struct work_struct *work) | |
8324aa91 | 798 | { |
dc9edc44 | 799 | struct request_queue *q = container_of(work, typeof(*q), release_work); |
8324aa91 | 800 | |
34dbad5d OS |
801 | if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags)) |
802 | blk_stat_remove_callback(q, q->poll_cb); | |
803 | blk_stat_free_callback(q->poll_cb); | |
d03f6cdc | 804 | bdi_put(q->backing_dev_info); |
e8989fae TH |
805 | blkcg_exit_queue(q); |
806 | ||
7e5a8794 | 807 | if (q->elevator) { |
7e5a8794 | 808 | ioc_clear_queue(q); |
54d5329d | 809 | elevator_exit(q, q->elevator); |
7e5a8794 | 810 | } |
777eb1bf | 811 | |
34dbad5d OS |
812 | blk_free_queue_stats(q->stats); |
813 | ||
b425e504 | 814 | blk_exit_rl(q, &q->root_rl); |
8324aa91 JA |
815 | |
816 | if (q->queue_tags) | |
817 | __blk_queue_free_tags(q); | |
818 | ||
6d247d7f CH |
819 | if (!q->mq_ops) { |
820 | if (q->exit_rq_fn) | |
821 | q->exit_rq_fn(q, q->fq->flush_rq); | |
f70ced09 | 822 | blk_free_flush_queue(q->fq); |
6d247d7f | 823 | } else { |
e09aae7e | 824 | blk_mq_release(q); |
6d247d7f | 825 | } |
18741986 | 826 | |
8324aa91 JA |
827 | blk_trace_shutdown(q); |
828 | ||
62ebce16 OS |
829 | if (q->mq_ops) |
830 | blk_mq_debugfs_unregister(q); | |
831 | ||
54efd50b KO |
832 | if (q->bio_split) |
833 | bioset_free(q->bio_split); | |
834 | ||
a73f730d | 835 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 836 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
837 | } |
838 | ||
dc9edc44 BVA |
839 | static void blk_release_queue(struct kobject *kobj) |
840 | { | |
841 | struct request_queue *q = | |
842 | container_of(kobj, struct request_queue, kobj); | |
843 | ||
844 | INIT_WORK(&q->release_work, __blk_release_queue); | |
845 | schedule_work(&q->release_work); | |
846 | } | |
847 | ||
52cf25d0 | 848 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
849 | .show = queue_attr_show, |
850 | .store = queue_attr_store, | |
851 | }; | |
852 | ||
853 | struct kobj_type blk_queue_ktype = { | |
854 | .sysfs_ops = &queue_sysfs_ops, | |
855 | .default_attrs = default_attrs, | |
856 | .release = blk_release_queue, | |
857 | }; | |
858 | ||
859 | int blk_register_queue(struct gendisk *disk) | |
860 | { | |
861 | int ret; | |
1d54ad6d | 862 | struct device *dev = disk_to_dev(disk); |
8324aa91 JA |
863 | struct request_queue *q = disk->queue; |
864 | ||
fb199746 | 865 | if (WARN_ON(!q)) |
8324aa91 JA |
866 | return -ENXIO; |
867 | ||
334335d2 OS |
868 | WARN_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags), |
869 | "%s is registering an already registered queue\n", | |
870 | kobject_name(&dev->kobj)); | |
871 | queue_flag_set_unlocked(QUEUE_FLAG_REGISTERED, q); | |
872 | ||
749fefe6 | 873 | /* |
17497acb TH |
874 | * SCSI probing may synchronously create and destroy a lot of |
875 | * request_queues for non-existent devices. Shutting down a fully | |
876 | * functional queue takes measureable wallclock time as RCU grace | |
877 | * periods are involved. To avoid excessive latency in these | |
878 | * cases, a request_queue starts out in a degraded mode which is | |
879 | * faster to shut down and is made fully functional here as | |
880 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 881 | */ |
df35c7c9 AS |
882 | if (!blk_queue_init_done(q)) { |
883 | queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); | |
3ef28e83 | 884 | percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c9 AS |
885 | blk_queue_bypass_end(q); |
886 | } | |
749fefe6 | 887 | |
1d54ad6d LZ |
888 | ret = blk_trace_init_sysfs(dev); |
889 | if (ret) | |
890 | return ret; | |
891 | ||
b410aff2 TE |
892 | /* Prevent changes through sysfs until registration is completed. */ |
893 | mutex_lock(&q->sysfs_lock); | |
894 | ||
c9059598 | 895 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
896 | if (ret < 0) { |
897 | blk_trace_remove_sysfs(dev); | |
b410aff2 | 898 | goto unlock; |
ed5302d3 | 899 | } |
8324aa91 | 900 | |
a8ecdd71 | 901 | if (q->mq_ops) { |
2d0364c8 | 902 | __blk_mq_register_dev(dev, q); |
a8ecdd71 BVA |
903 | blk_mq_debugfs_register(q); |
904 | } | |
9c1051aa | 905 | |
8324aa91 JA |
906 | kobject_uevent(&q->kobj, KOBJ_ADD); |
907 | ||
8330cdb0 | 908 | wbt_enable_default(q); |
87760e5e | 909 | |
d61fcfa4 SL |
910 | blk_throtl_register_queue(q); |
911 | ||
80c6b157 OS |
912 | if (q->request_fn || (q->mq_ops && q->elevator)) { |
913 | ret = elv_register_queue(q); | |
914 | if (ret) { | |
915 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
916 | kobject_del(&q->kobj); | |
917 | blk_trace_remove_sysfs(dev); | |
918 | kobject_put(&dev->kobj); | |
b410aff2 | 919 | goto unlock; |
80c6b157 | 920 | } |
8324aa91 | 921 | } |
b410aff2 TE |
922 | ret = 0; |
923 | unlock: | |
924 | mutex_unlock(&q->sysfs_lock); | |
925 | return ret; | |
8324aa91 JA |
926 | } |
927 | ||
928 | void blk_unregister_queue(struct gendisk *disk) | |
929 | { | |
930 | struct request_queue *q = disk->queue; | |
931 | ||
fb199746 AM |
932 | if (WARN_ON(!q)) |
933 | return; | |
934 | ||
e9a823fb | 935 | mutex_lock(&q->sysfs_lock); |
334335d2 | 936 | queue_flag_clear_unlocked(QUEUE_FLAG_REGISTERED, q); |
e9a823fb | 937 | mutex_unlock(&q->sysfs_lock); |
334335d2 | 938 | |
02ba8893 OS |
939 | wbt_exit(q); |
940 | ||
941 | ||
320ae51f | 942 | if (q->mq_ops) |
b21d5b30 | 943 | blk_mq_unregister_dev(disk_to_dev(disk), q); |
320ae51f | 944 | |
80c6b157 | 945 | if (q->request_fn || (q->mq_ops && q->elevator)) |
8324aa91 JA |
946 | elv_unregister_queue(q); |
947 | ||
48c0d4d4 ZK |
948 | kobject_uevent(&q->kobj, KOBJ_REMOVE); |
949 | kobject_del(&q->kobj); | |
950 | blk_trace_remove_sysfs(disk_to_dev(disk)); | |
951 | kobject_put(&disk_to_dev(disk)->kobj); | |
8324aa91 | 952 | } |