Commit | Line | Data |
---|---|---|
8324aa91 JA |
1 | /* |
2 | * Functions related to sysfs handling | |
3 | */ | |
4 | #include <linux/kernel.h> | |
5a0e3ad6 | 5 | #include <linux/slab.h> |
8324aa91 JA |
6 | #include <linux/module.h> |
7 | #include <linux/bio.h> | |
8 | #include <linux/blkdev.h> | |
66114cad | 9 | #include <linux/backing-dev.h> |
8324aa91 | 10 | #include <linux/blktrace_api.h> |
320ae51f | 11 | #include <linux/blk-mq.h> |
eea8f41c | 12 | #include <linux/blk-cgroup.h> |
8324aa91 JA |
13 | |
14 | #include "blk.h" | |
3edcc0ce | 15 | #include "blk-mq.h" |
87760e5e | 16 | #include "blk-wbt.h" |
8324aa91 JA |
17 | |
18 | struct queue_sysfs_entry { | |
19 | struct attribute attr; | |
20 | ssize_t (*show)(struct request_queue *, char *); | |
21 | ssize_t (*store)(struct request_queue *, const char *, size_t); | |
22 | }; | |
23 | ||
24 | static ssize_t | |
9cb308ce | 25 | queue_var_show(unsigned long var, char *page) |
8324aa91 | 26 | { |
9cb308ce | 27 | return sprintf(page, "%lu\n", var); |
8324aa91 JA |
28 | } |
29 | ||
30 | static ssize_t | |
31 | queue_var_store(unsigned long *var, const char *page, size_t count) | |
32 | { | |
b1f3b64d DR |
33 | int err; |
34 | unsigned long v; | |
35 | ||
ed751e68 | 36 | err = kstrtoul(page, 10, &v); |
b1f3b64d DR |
37 | if (err || v > UINT_MAX) |
38 | return -EINVAL; | |
39 | ||
40 | *var = v; | |
8324aa91 | 41 | |
8324aa91 JA |
42 | return count; |
43 | } | |
44 | ||
80e091d1 | 45 | static ssize_t queue_var_store64(s64 *var, const char *page) |
87760e5e JA |
46 | { |
47 | int err; | |
80e091d1 | 48 | s64 v; |
87760e5e | 49 | |
80e091d1 | 50 | err = kstrtos64(page, 10, &v); |
87760e5e JA |
51 | if (err < 0) |
52 | return err; | |
53 | ||
54 | *var = v; | |
55 | return 0; | |
56 | } | |
57 | ||
8324aa91 JA |
58 | static ssize_t queue_requests_show(struct request_queue *q, char *page) |
59 | { | |
60 | return queue_var_show(q->nr_requests, (page)); | |
61 | } | |
62 | ||
63 | static ssize_t | |
64 | queue_requests_store(struct request_queue *q, const char *page, size_t count) | |
65 | { | |
8324aa91 | 66 | unsigned long nr; |
e3a2b3f9 | 67 | int ret, err; |
b8a9ae77 | 68 | |
e3a2b3f9 | 69 | if (!q->request_fn && !q->mq_ops) |
b8a9ae77 JA |
70 | return -EINVAL; |
71 | ||
72 | ret = queue_var_store(&nr, page, count); | |
b1f3b64d DR |
73 | if (ret < 0) |
74 | return ret; | |
75 | ||
8324aa91 JA |
76 | if (nr < BLKDEV_MIN_RQ) |
77 | nr = BLKDEV_MIN_RQ; | |
78 | ||
e3a2b3f9 JA |
79 | if (q->request_fn) |
80 | err = blk_update_nr_requests(q, nr); | |
81 | else | |
82 | err = blk_mq_update_nr_requests(q, nr); | |
83 | ||
84 | if (err) | |
85 | return err; | |
86 | ||
8324aa91 JA |
87 | return ret; |
88 | } | |
89 | ||
90 | static ssize_t queue_ra_show(struct request_queue *q, char *page) | |
91 | { | |
9cb308ce | 92 | unsigned long ra_kb = q->backing_dev_info.ra_pages << |
09cbfeaf | 93 | (PAGE_SHIFT - 10); |
8324aa91 JA |
94 | |
95 | return queue_var_show(ra_kb, (page)); | |
96 | } | |
97 | ||
98 | static ssize_t | |
99 | queue_ra_store(struct request_queue *q, const char *page, size_t count) | |
100 | { | |
101 | unsigned long ra_kb; | |
102 | ssize_t ret = queue_var_store(&ra_kb, page, count); | |
103 | ||
b1f3b64d DR |
104 | if (ret < 0) |
105 | return ret; | |
106 | ||
09cbfeaf | 107 | q->backing_dev_info.ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
108 | |
109 | return ret; | |
110 | } | |
111 | ||
112 | static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) | |
113 | { | |
ae03bf63 | 114 | int max_sectors_kb = queue_max_sectors(q) >> 1; |
8324aa91 JA |
115 | |
116 | return queue_var_show(max_sectors_kb, (page)); | |
117 | } | |
118 | ||
c77a5710 MP |
119 | static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
120 | { | |
121 | return queue_var_show(queue_max_segments(q), (page)); | |
122 | } | |
123 | ||
13f05c8d MP |
124 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
125 | { | |
126 | return queue_var_show(q->limits.max_integrity_segments, (page)); | |
127 | } | |
128 | ||
c77a5710 MP |
129 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
130 | { | |
e692cb66 | 131 | if (blk_queue_cluster(q)) |
c77a5710 MP |
132 | return queue_var_show(queue_max_segment_size(q), (page)); |
133 | ||
09cbfeaf | 134 | return queue_var_show(PAGE_SIZE, (page)); |
c77a5710 MP |
135 | } |
136 | ||
e1defc4f | 137 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 138 | { |
e1defc4f | 139 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
140 | } |
141 | ||
c72758f3 MP |
142 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
143 | { | |
144 | return queue_var_show(queue_physical_block_size(q), page); | |
145 | } | |
146 | ||
87caf97c HR |
147 | static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
148 | { | |
149 | return queue_var_show(q->limits.chunk_sectors, page); | |
150 | } | |
151 | ||
c72758f3 MP |
152 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
153 | { | |
154 | return queue_var_show(queue_io_min(q), page); | |
155 | } | |
156 | ||
157 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
158 | { | |
159 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
160 | } |
161 | ||
86b37281 MP |
162 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
163 | { | |
164 | return queue_var_show(q->limits.discard_granularity, page); | |
165 | } | |
166 | ||
0034af03 JA |
167 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
168 | { | |
0034af03 | 169 | |
18f922d0 A |
170 | return sprintf(page, "%llu\n", |
171 | (unsigned long long)q->limits.max_hw_discard_sectors << 9); | |
0034af03 JA |
172 | } |
173 | ||
86b37281 MP |
174 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
175 | { | |
a934a00a MP |
176 | return sprintf(page, "%llu\n", |
177 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
178 | } |
179 | ||
0034af03 JA |
180 | static ssize_t queue_discard_max_store(struct request_queue *q, |
181 | const char *page, size_t count) | |
182 | { | |
183 | unsigned long max_discard; | |
184 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
185 | ||
186 | if (ret < 0) | |
187 | return ret; | |
188 | ||
189 | if (max_discard & (q->limits.discard_granularity - 1)) | |
190 | return -EINVAL; | |
191 | ||
192 | max_discard >>= 9; | |
193 | if (max_discard > UINT_MAX) | |
194 | return -EINVAL; | |
195 | ||
196 | if (max_discard > q->limits.max_hw_discard_sectors) | |
197 | max_discard = q->limits.max_hw_discard_sectors; | |
198 | ||
199 | q->limits.max_discard_sectors = max_discard; | |
200 | return ret; | |
201 | } | |
202 | ||
98262f27 MP |
203 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
204 | { | |
205 | return queue_var_show(queue_discard_zeroes_data(q), page); | |
206 | } | |
207 | ||
4363ac7c MP |
208 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
209 | { | |
210 | return sprintf(page, "%llu\n", | |
211 | (unsigned long long)q->limits.max_write_same_sectors << 9); | |
212 | } | |
213 | ||
214 | ||
8324aa91 JA |
215 | static ssize_t |
216 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
217 | { | |
218 | unsigned long max_sectors_kb, | |
ae03bf63 | 219 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 220 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
221 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
222 | ||
b1f3b64d DR |
223 | if (ret < 0) |
224 | return ret; | |
225 | ||
ca369d51 MP |
226 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
227 | q->limits.max_dev_sectors >> 1); | |
228 | ||
8324aa91 JA |
229 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
230 | return -EINVAL; | |
7c239517 | 231 | |
8324aa91 | 232 | spin_lock_irq(q->queue_lock); |
c295fc05 | 233 | q->limits.max_sectors = max_sectors_kb << 1; |
8324aa91 JA |
234 | spin_unlock_irq(q->queue_lock); |
235 | ||
236 | return ret; | |
237 | } | |
238 | ||
239 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
240 | { | |
ae03bf63 | 241 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
242 | |
243 | return queue_var_show(max_hw_sectors_kb, (page)); | |
244 | } | |
245 | ||
956bcb7c JA |
246 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
247 | static ssize_t \ | |
248 | queue_show_##name(struct request_queue *q, char *page) \ | |
249 | { \ | |
250 | int bit; \ | |
251 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
252 | return queue_var_show(neg ? !bit : bit, page); \ | |
253 | } \ | |
254 | static ssize_t \ | |
255 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
256 | { \ | |
257 | unsigned long val; \ | |
258 | ssize_t ret; \ | |
259 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
260 | if (ret < 0) \ |
261 | return ret; \ | |
956bcb7c JA |
262 | if (neg) \ |
263 | val = !val; \ | |
264 | \ | |
265 | spin_lock_irq(q->queue_lock); \ | |
266 | if (val) \ | |
267 | queue_flag_set(QUEUE_FLAG_##flag, q); \ | |
268 | else \ | |
269 | queue_flag_clear(QUEUE_FLAG_##flag, q); \ | |
270 | spin_unlock_irq(q->queue_lock); \ | |
271 | return ret; \ | |
1308835f BZ |
272 | } |
273 | ||
956bcb7c JA |
274 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
275 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
276 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
277 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 278 | |
797476b8 DLM |
279 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
280 | { | |
281 | switch (blk_queue_zoned_model(q)) { | |
282 | case BLK_ZONED_HA: | |
283 | return sprintf(page, "host-aware\n"); | |
284 | case BLK_ZONED_HM: | |
285 | return sprintf(page, "host-managed\n"); | |
286 | default: | |
287 | return sprintf(page, "none\n"); | |
288 | } | |
289 | } | |
290 | ||
ac9fafa1 AB |
291 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
292 | { | |
488991e2 AB |
293 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
294 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
295 | } |
296 | ||
297 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
298 | size_t count) | |
299 | { | |
300 | unsigned long nm; | |
301 | ssize_t ret = queue_var_store(&nm, page, count); | |
302 | ||
b1f3b64d DR |
303 | if (ret < 0) |
304 | return ret; | |
305 | ||
bf0f9702 | 306 | spin_lock_irq(q->queue_lock); |
488991e2 AB |
307 | queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
308 | queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
309 | if (nm == 2) | |
bf0f9702 | 310 | queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 AB |
311 | else if (nm) |
312 | queue_flag_set(QUEUE_FLAG_NOXMERGES, q); | |
bf0f9702 | 313 | spin_unlock_irq(q->queue_lock); |
1308835f | 314 | |
ac9fafa1 AB |
315 | return ret; |
316 | } | |
317 | ||
c7c22e4d JA |
318 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
319 | { | |
9cb308ce | 320 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 321 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 322 | |
5757a6d7 | 323 | return queue_var_show(set << force, page); |
c7c22e4d JA |
324 | } |
325 | ||
326 | static ssize_t | |
327 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
328 | { | |
329 | ssize_t ret = -EINVAL; | |
0a06ff06 | 330 | #ifdef CONFIG_SMP |
c7c22e4d JA |
331 | unsigned long val; |
332 | ||
333 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
334 | if (ret < 0) |
335 | return ret; | |
336 | ||
c7c22e4d | 337 | spin_lock_irq(q->queue_lock); |
e8037d49 | 338 | if (val == 2) { |
c7c22e4d | 339 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
e8037d49 ES |
340 | queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
341 | } else if (val == 1) { | |
342 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); | |
343 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
344 | } else if (val == 0) { | |
5757a6d7 DW |
345 | queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
346 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
347 | } | |
c7c22e4d JA |
348 | spin_unlock_irq(q->queue_lock); |
349 | #endif | |
350 | return ret; | |
351 | } | |
8324aa91 | 352 | |
06426adf JA |
353 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
354 | { | |
64f1c21e JA |
355 | int val; |
356 | ||
357 | if (q->poll_nsec == -1) | |
358 | val = -1; | |
359 | else | |
360 | val = q->poll_nsec / 1000; | |
361 | ||
362 | return sprintf(page, "%d\n", val); | |
06426adf JA |
363 | } |
364 | ||
365 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
366 | size_t count) | |
367 | { | |
64f1c21e | 368 | int err, val; |
06426adf JA |
369 | |
370 | if (!q->mq_ops || !q->mq_ops->poll) | |
371 | return -EINVAL; | |
372 | ||
64f1c21e JA |
373 | err = kstrtoint(page, 10, &val); |
374 | if (err < 0) | |
375 | return err; | |
06426adf | 376 | |
64f1c21e JA |
377 | if (val == -1) |
378 | q->poll_nsec = -1; | |
379 | else | |
380 | q->poll_nsec = val * 1000; | |
381 | ||
382 | return count; | |
06426adf JA |
383 | } |
384 | ||
05229bee JA |
385 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
386 | { | |
387 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
388 | } | |
389 | ||
390 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
391 | size_t count) | |
392 | { | |
393 | unsigned long poll_on; | |
394 | ssize_t ret; | |
395 | ||
396 | if (!q->mq_ops || !q->mq_ops->poll) | |
397 | return -EINVAL; | |
398 | ||
399 | ret = queue_var_store(&poll_on, page, count); | |
400 | if (ret < 0) | |
401 | return ret; | |
402 | ||
403 | spin_lock_irq(q->queue_lock); | |
404 | if (poll_on) | |
405 | queue_flag_set(QUEUE_FLAG_POLL, q); | |
406 | else | |
407 | queue_flag_clear(QUEUE_FLAG_POLL, q); | |
408 | spin_unlock_irq(q->queue_lock); | |
409 | ||
410 | return ret; | |
411 | } | |
412 | ||
87760e5e JA |
413 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
414 | { | |
415 | if (!q->rq_wb) | |
416 | return -EINVAL; | |
417 | ||
418 | return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000)); | |
419 | } | |
420 | ||
421 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
422 | size_t count) | |
423 | { | |
80e091d1 | 424 | struct rq_wb *rwb; |
87760e5e | 425 | ssize_t ret; |
80e091d1 | 426 | s64 val; |
87760e5e | 427 | |
87760e5e JA |
428 | ret = queue_var_store64(&val, page); |
429 | if (ret < 0) | |
430 | return ret; | |
d62118b6 JA |
431 | if (val < -1) |
432 | return -EINVAL; | |
433 | ||
434 | rwb = q->rq_wb; | |
435 | if (!rwb) { | |
436 | ret = wbt_init(q); | |
437 | if (ret) | |
438 | return ret; | |
439 | ||
440 | rwb = q->rq_wb; | |
441 | if (!rwb) | |
442 | return -EINVAL; | |
443 | } | |
87760e5e | 444 | |
80e091d1 JA |
445 | if (val == -1) |
446 | rwb->min_lat_nsec = wbt_default_latency_nsec(q); | |
447 | else if (val >= 0) | |
448 | rwb->min_lat_nsec = val * 1000ULL; | |
d62118b6 JA |
449 | |
450 | if (rwb->enable_state == WBT_STATE_ON_DEFAULT) | |
451 | rwb->enable_state = WBT_STATE_ON_MANUAL; | |
80e091d1 JA |
452 | |
453 | wbt_update_limits(rwb); | |
87760e5e JA |
454 | return count; |
455 | } | |
456 | ||
93e9d8e8 JA |
457 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
458 | { | |
459 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
460 | return sprintf(page, "write back\n"); | |
461 | ||
462 | return sprintf(page, "write through\n"); | |
463 | } | |
464 | ||
465 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
466 | size_t count) | |
467 | { | |
468 | int set = -1; | |
469 | ||
470 | if (!strncmp(page, "write back", 10)) | |
471 | set = 1; | |
472 | else if (!strncmp(page, "write through", 13) || | |
473 | !strncmp(page, "none", 4)) | |
474 | set = 0; | |
475 | ||
476 | if (set == -1) | |
477 | return -EINVAL; | |
478 | ||
479 | spin_lock_irq(q->queue_lock); | |
480 | if (set) | |
481 | queue_flag_set(QUEUE_FLAG_WC, q); | |
482 | else | |
483 | queue_flag_clear(QUEUE_FLAG_WC, q); | |
484 | spin_unlock_irq(q->queue_lock); | |
485 | ||
486 | return count; | |
487 | } | |
488 | ||
ea6ca600 YK |
489 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
490 | { | |
491 | return queue_var_show(blk_queue_dax(q), page); | |
492 | } | |
493 | ||
cf43e6be JA |
494 | static ssize_t print_stat(char *page, struct blk_rq_stat *stat, const char *pre) |
495 | { | |
496 | return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n", | |
497 | pre, (long long) stat->nr_samples, | |
498 | (long long) stat->mean, (long long) stat->min, | |
499 | (long long) stat->max); | |
500 | } | |
501 | ||
502 | static ssize_t queue_stats_show(struct request_queue *q, char *page) | |
503 | { | |
504 | struct blk_rq_stat stat[2]; | |
505 | ssize_t ret; | |
506 | ||
507 | blk_queue_stat_get(q, stat); | |
508 | ||
509 | ret = print_stat(page, &stat[BLK_STAT_READ], "read :"); | |
510 | ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:"); | |
511 | return ret; | |
512 | } | |
513 | ||
8324aa91 JA |
514 | static struct queue_sysfs_entry queue_requests_entry = { |
515 | .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, | |
516 | .show = queue_requests_show, | |
517 | .store = queue_requests_store, | |
518 | }; | |
519 | ||
520 | static struct queue_sysfs_entry queue_ra_entry = { | |
521 | .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, | |
522 | .show = queue_ra_show, | |
523 | .store = queue_ra_store, | |
524 | }; | |
525 | ||
526 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
527 | .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, | |
528 | .show = queue_max_sectors_show, | |
529 | .store = queue_max_sectors_store, | |
530 | }; | |
531 | ||
532 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
533 | .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO }, | |
534 | .show = queue_max_hw_sectors_show, | |
535 | }; | |
536 | ||
c77a5710 MP |
537 | static struct queue_sysfs_entry queue_max_segments_entry = { |
538 | .attr = {.name = "max_segments", .mode = S_IRUGO }, | |
539 | .show = queue_max_segments_show, | |
540 | }; | |
541 | ||
13f05c8d MP |
542 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
543 | .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, | |
544 | .show = queue_max_integrity_segments_show, | |
545 | }; | |
546 | ||
c77a5710 MP |
547 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
548 | .attr = {.name = "max_segment_size", .mode = S_IRUGO }, | |
549 | .show = queue_max_segment_size_show, | |
550 | }; | |
551 | ||
8324aa91 JA |
552 | static struct queue_sysfs_entry queue_iosched_entry = { |
553 | .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, | |
554 | .show = elv_iosched_show, | |
555 | .store = elv_iosched_store, | |
556 | }; | |
557 | ||
e68b903c MP |
558 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
559 | .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, | |
e1defc4f MP |
560 | .show = queue_logical_block_size_show, |
561 | }; | |
562 | ||
563 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
564 | .attr = {.name = "logical_block_size", .mode = S_IRUGO }, | |
565 | .show = queue_logical_block_size_show, | |
e68b903c MP |
566 | }; |
567 | ||
c72758f3 MP |
568 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
569 | .attr = {.name = "physical_block_size", .mode = S_IRUGO }, | |
570 | .show = queue_physical_block_size_show, | |
571 | }; | |
572 | ||
87caf97c HR |
573 | static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
574 | .attr = {.name = "chunk_sectors", .mode = S_IRUGO }, | |
575 | .show = queue_chunk_sectors_show, | |
576 | }; | |
577 | ||
c72758f3 MP |
578 | static struct queue_sysfs_entry queue_io_min_entry = { |
579 | .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, | |
580 | .show = queue_io_min_show, | |
581 | }; | |
582 | ||
583 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
584 | .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, | |
585 | .show = queue_io_opt_show, | |
e68b903c MP |
586 | }; |
587 | ||
86b37281 MP |
588 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
589 | .attr = {.name = "discard_granularity", .mode = S_IRUGO }, | |
590 | .show = queue_discard_granularity_show, | |
591 | }; | |
592 | ||
0034af03 JA |
593 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
594 | .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, | |
595 | .show = queue_discard_max_hw_show, | |
596 | }; | |
597 | ||
86b37281 | 598 | static struct queue_sysfs_entry queue_discard_max_entry = { |
0034af03 | 599 | .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
86b37281 | 600 | .show = queue_discard_max_show, |
0034af03 | 601 | .store = queue_discard_max_store, |
86b37281 MP |
602 | }; |
603 | ||
98262f27 MP |
604 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
605 | .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, | |
606 | .show = queue_discard_zeroes_data_show, | |
607 | }; | |
608 | ||
4363ac7c MP |
609 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
610 | .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, | |
611 | .show = queue_write_same_max_show, | |
612 | }; | |
613 | ||
1308835f BZ |
614 | static struct queue_sysfs_entry queue_nonrot_entry = { |
615 | .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
616 | .show = queue_show_nonrot, |
617 | .store = queue_store_nonrot, | |
1308835f BZ |
618 | }; |
619 | ||
797476b8 DLM |
620 | static struct queue_sysfs_entry queue_zoned_entry = { |
621 | .attr = {.name = "zoned", .mode = S_IRUGO }, | |
622 | .show = queue_zoned_show, | |
623 | }; | |
624 | ||
ac9fafa1 AB |
625 | static struct queue_sysfs_entry queue_nomerges_entry = { |
626 | .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, | |
627 | .show = queue_nomerges_show, | |
628 | .store = queue_nomerges_store, | |
629 | }; | |
630 | ||
c7c22e4d JA |
631 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
632 | .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, | |
633 | .show = queue_rq_affinity_show, | |
634 | .store = queue_rq_affinity_store, | |
635 | }; | |
636 | ||
bc58ba94 JA |
637 | static struct queue_sysfs_entry queue_iostats_entry = { |
638 | .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
639 | .show = queue_show_iostats, |
640 | .store = queue_store_iostats, | |
bc58ba94 JA |
641 | }; |
642 | ||
e2e1a148 JA |
643 | static struct queue_sysfs_entry queue_random_entry = { |
644 | .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
645 | .show = queue_show_random, |
646 | .store = queue_store_random, | |
e2e1a148 JA |
647 | }; |
648 | ||
05229bee JA |
649 | static struct queue_sysfs_entry queue_poll_entry = { |
650 | .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, | |
651 | .show = queue_poll_show, | |
652 | .store = queue_poll_store, | |
653 | }; | |
654 | ||
06426adf JA |
655 | static struct queue_sysfs_entry queue_poll_delay_entry = { |
656 | .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR }, | |
657 | .show = queue_poll_delay_show, | |
658 | .store = queue_poll_delay_store, | |
659 | }; | |
660 | ||
93e9d8e8 JA |
661 | static struct queue_sysfs_entry queue_wc_entry = { |
662 | .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR }, | |
663 | .show = queue_wc_show, | |
664 | .store = queue_wc_store, | |
665 | }; | |
666 | ||
ea6ca600 YK |
667 | static struct queue_sysfs_entry queue_dax_entry = { |
668 | .attr = {.name = "dax", .mode = S_IRUGO }, | |
669 | .show = queue_dax_show, | |
670 | }; | |
671 | ||
cf43e6be JA |
672 | static struct queue_sysfs_entry queue_stats_entry = { |
673 | .attr = {.name = "stats", .mode = S_IRUGO }, | |
674 | .show = queue_stats_show, | |
675 | }; | |
676 | ||
87760e5e JA |
677 | static struct queue_sysfs_entry queue_wb_lat_entry = { |
678 | .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR }, | |
679 | .show = queue_wb_lat_show, | |
680 | .store = queue_wb_lat_store, | |
681 | }; | |
682 | ||
8324aa91 JA |
683 | static struct attribute *default_attrs[] = { |
684 | &queue_requests_entry.attr, | |
685 | &queue_ra_entry.attr, | |
686 | &queue_max_hw_sectors_entry.attr, | |
687 | &queue_max_sectors_entry.attr, | |
c77a5710 | 688 | &queue_max_segments_entry.attr, |
13f05c8d | 689 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 690 | &queue_max_segment_size_entry.attr, |
8324aa91 | 691 | &queue_iosched_entry.attr, |
e68b903c | 692 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 693 | &queue_logical_block_size_entry.attr, |
c72758f3 | 694 | &queue_physical_block_size_entry.attr, |
87caf97c | 695 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
696 | &queue_io_min_entry.attr, |
697 | &queue_io_opt_entry.attr, | |
86b37281 MP |
698 | &queue_discard_granularity_entry.attr, |
699 | &queue_discard_max_entry.attr, | |
0034af03 | 700 | &queue_discard_max_hw_entry.attr, |
98262f27 | 701 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 702 | &queue_write_same_max_entry.attr, |
1308835f | 703 | &queue_nonrot_entry.attr, |
797476b8 | 704 | &queue_zoned_entry.attr, |
ac9fafa1 | 705 | &queue_nomerges_entry.attr, |
c7c22e4d | 706 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 707 | &queue_iostats_entry.attr, |
e2e1a148 | 708 | &queue_random_entry.attr, |
05229bee | 709 | &queue_poll_entry.attr, |
93e9d8e8 | 710 | &queue_wc_entry.attr, |
ea6ca600 | 711 | &queue_dax_entry.attr, |
cf43e6be | 712 | &queue_stats_entry.attr, |
87760e5e | 713 | &queue_wb_lat_entry.attr, |
06426adf | 714 | &queue_poll_delay_entry.attr, |
8324aa91 JA |
715 | NULL, |
716 | }; | |
717 | ||
718 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) | |
719 | ||
720 | static ssize_t | |
721 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
722 | { | |
723 | struct queue_sysfs_entry *entry = to_queue(attr); | |
724 | struct request_queue *q = | |
725 | container_of(kobj, struct request_queue, kobj); | |
726 | ssize_t res; | |
727 | ||
728 | if (!entry->show) | |
729 | return -EIO; | |
730 | mutex_lock(&q->sysfs_lock); | |
3f3299d5 | 731 | if (blk_queue_dying(q)) { |
8324aa91 JA |
732 | mutex_unlock(&q->sysfs_lock); |
733 | return -ENOENT; | |
734 | } | |
735 | res = entry->show(q, page); | |
736 | mutex_unlock(&q->sysfs_lock); | |
737 | return res; | |
738 | } | |
739 | ||
740 | static ssize_t | |
741 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
742 | const char *page, size_t length) | |
743 | { | |
744 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 745 | struct request_queue *q; |
8324aa91 JA |
746 | ssize_t res; |
747 | ||
748 | if (!entry->store) | |
749 | return -EIO; | |
6728cb0e JA |
750 | |
751 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 752 | mutex_lock(&q->sysfs_lock); |
3f3299d5 | 753 | if (blk_queue_dying(q)) { |
8324aa91 JA |
754 | mutex_unlock(&q->sysfs_lock); |
755 | return -ENOENT; | |
756 | } | |
757 | res = entry->store(q, page, length); | |
758 | mutex_unlock(&q->sysfs_lock); | |
759 | return res; | |
760 | } | |
761 | ||
548bc8e1 TH |
762 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
763 | { | |
764 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
765 | rcu_head); | |
766 | kmem_cache_free(blk_requestq_cachep, q); | |
767 | } | |
768 | ||
8324aa91 | 769 | /** |
499337bb AM |
770 | * blk_release_queue: - release a &struct request_queue when it is no longer needed |
771 | * @kobj: the kobj belonging to the request queue to be released | |
8324aa91 JA |
772 | * |
773 | * Description: | |
499337bb | 774 | * blk_release_queue is the pair to blk_init_queue() or |
8324aa91 JA |
775 | * blk_queue_make_request(). It should be called when a request queue is |
776 | * being released; typically when a block device is being de-registered. | |
777 | * Currently, its primary task it to free all the &struct request | |
778 | * structures that were allocated to the queue and the queue itself. | |
779 | * | |
45a9c9d9 BVA |
780 | * Note: |
781 | * The low level driver must have finished any outstanding requests first | |
782 | * via blk_cleanup_queue(). | |
8324aa91 JA |
783 | **/ |
784 | static void blk_release_queue(struct kobject *kobj) | |
785 | { | |
786 | struct request_queue *q = | |
787 | container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 788 | |
87760e5e | 789 | wbt_exit(q); |
b02176f3 | 790 | bdi_exit(&q->backing_dev_info); |
e8989fae TH |
791 | blkcg_exit_queue(q); |
792 | ||
7e5a8794 TH |
793 | if (q->elevator) { |
794 | spin_lock_irq(q->queue_lock); | |
795 | ioc_clear_queue(q); | |
796 | spin_unlock_irq(q->queue_lock); | |
777eb1bf | 797 | elevator_exit(q->elevator); |
7e5a8794 | 798 | } |
777eb1bf | 799 | |
a051661c | 800 | blk_exit_rl(&q->root_rl); |
8324aa91 JA |
801 | |
802 | if (q->queue_tags) | |
803 | __blk_queue_free_tags(q); | |
804 | ||
45a9c9d9 | 805 | if (!q->mq_ops) |
f70ced09 | 806 | blk_free_flush_queue(q->fq); |
e09aae7e ML |
807 | else |
808 | blk_mq_release(q); | |
18741986 | 809 | |
8324aa91 JA |
810 | blk_trace_shutdown(q); |
811 | ||
54efd50b KO |
812 | if (q->bio_split) |
813 | bioset_free(q->bio_split); | |
814 | ||
a73f730d | 815 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 816 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
817 | } |
818 | ||
52cf25d0 | 819 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
820 | .show = queue_attr_show, |
821 | .store = queue_attr_store, | |
822 | }; | |
823 | ||
824 | struct kobj_type blk_queue_ktype = { | |
825 | .sysfs_ops = &queue_sysfs_ops, | |
826 | .default_attrs = default_attrs, | |
827 | .release = blk_release_queue, | |
828 | }; | |
829 | ||
87760e5e JA |
830 | static void blk_wb_init(struct request_queue *q) |
831 | { | |
832 | #ifndef CONFIG_BLK_WBT_MQ | |
833 | if (q->mq_ops) | |
834 | return; | |
835 | #endif | |
836 | #ifndef CONFIG_BLK_WBT_SQ | |
837 | if (q->request_fn) | |
838 | return; | |
839 | #endif | |
840 | ||
841 | /* | |
842 | * If this fails, we don't get throttling | |
843 | */ | |
8054b89f | 844 | wbt_init(q); |
87760e5e JA |
845 | } |
846 | ||
8324aa91 JA |
847 | int blk_register_queue(struct gendisk *disk) |
848 | { | |
849 | int ret; | |
1d54ad6d | 850 | struct device *dev = disk_to_dev(disk); |
8324aa91 JA |
851 | struct request_queue *q = disk->queue; |
852 | ||
fb199746 | 853 | if (WARN_ON(!q)) |
8324aa91 JA |
854 | return -ENXIO; |
855 | ||
749fefe6 | 856 | /* |
17497acb TH |
857 | * SCSI probing may synchronously create and destroy a lot of |
858 | * request_queues for non-existent devices. Shutting down a fully | |
859 | * functional queue takes measureable wallclock time as RCU grace | |
860 | * periods are involved. To avoid excessive latency in these | |
861 | * cases, a request_queue starts out in a degraded mode which is | |
862 | * faster to shut down and is made fully functional here as | |
863 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 864 | */ |
df35c7c9 AS |
865 | if (!blk_queue_init_done(q)) { |
866 | queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); | |
3ef28e83 | 867 | percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c9 AS |
868 | blk_queue_bypass_end(q); |
869 | } | |
749fefe6 | 870 | |
1d54ad6d LZ |
871 | ret = blk_trace_init_sysfs(dev); |
872 | if (ret) | |
873 | return ret; | |
874 | ||
c9059598 | 875 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
876 | if (ret < 0) { |
877 | blk_trace_remove_sysfs(dev); | |
8324aa91 | 878 | return ret; |
ed5302d3 | 879 | } |
8324aa91 JA |
880 | |
881 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
882 | ||
320ae51f | 883 | if (q->mq_ops) |
b21d5b30 | 884 | blk_mq_register_dev(dev, q); |
320ae51f | 885 | |
87760e5e JA |
886 | blk_wb_init(q); |
887 | ||
cd43e26f MP |
888 | if (!q->request_fn) |
889 | return 0; | |
890 | ||
8324aa91 JA |
891 | ret = elv_register_queue(q); |
892 | if (ret) { | |
893 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
894 | kobject_del(&q->kobj); | |
80656b67 | 895 | blk_trace_remove_sysfs(dev); |
c87ffbb8 | 896 | kobject_put(&dev->kobj); |
8324aa91 JA |
897 | return ret; |
898 | } | |
899 | ||
900 | return 0; | |
901 | } | |
902 | ||
903 | void blk_unregister_queue(struct gendisk *disk) | |
904 | { | |
905 | struct request_queue *q = disk->queue; | |
906 | ||
fb199746 AM |
907 | if (WARN_ON(!q)) |
908 | return; | |
909 | ||
320ae51f | 910 | if (q->mq_ops) |
b21d5b30 | 911 | blk_mq_unregister_dev(disk_to_dev(disk), q); |
320ae51f | 912 | |
48c0d4d4 | 913 | if (q->request_fn) |
8324aa91 JA |
914 | elv_unregister_queue(q); |
915 | ||
48c0d4d4 ZK |
916 | kobject_uevent(&q->kobj, KOBJ_REMOVE); |
917 | kobject_del(&q->kobj); | |
918 | blk_trace_remove_sysfs(disk_to_dev(disk)); | |
919 | kobject_put(&disk_to_dev(disk)->kobj); | |
8324aa91 | 920 | } |