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Commit | Line | Data |
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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 | ||
a6f0788e CK |
214 | static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
215 | { | |
216 | return sprintf(page, "%llu\n", | |
217 | (unsigned long long)q->limits.max_write_zeroes_sectors << 9); | |
218 | } | |
4363ac7c | 219 | |
8324aa91 JA |
220 | static ssize_t |
221 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
222 | { | |
223 | unsigned long max_sectors_kb, | |
ae03bf63 | 224 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 225 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
226 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
227 | ||
b1f3b64d DR |
228 | if (ret < 0) |
229 | return ret; | |
230 | ||
ca369d51 MP |
231 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
232 | q->limits.max_dev_sectors >> 1); | |
233 | ||
8324aa91 JA |
234 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
235 | return -EINVAL; | |
7c239517 | 236 | |
8324aa91 | 237 | spin_lock_irq(q->queue_lock); |
c295fc05 | 238 | q->limits.max_sectors = max_sectors_kb << 1; |
8324aa91 JA |
239 | spin_unlock_irq(q->queue_lock); |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
245 | { | |
ae03bf63 | 246 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
247 | |
248 | return queue_var_show(max_hw_sectors_kb, (page)); | |
249 | } | |
250 | ||
956bcb7c JA |
251 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
252 | static ssize_t \ | |
253 | queue_show_##name(struct request_queue *q, char *page) \ | |
254 | { \ | |
255 | int bit; \ | |
256 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
257 | return queue_var_show(neg ? !bit : bit, page); \ | |
258 | } \ | |
259 | static ssize_t \ | |
260 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
261 | { \ | |
262 | unsigned long val; \ | |
263 | ssize_t ret; \ | |
264 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
265 | if (ret < 0) \ |
266 | return ret; \ | |
956bcb7c JA |
267 | if (neg) \ |
268 | val = !val; \ | |
269 | \ | |
270 | spin_lock_irq(q->queue_lock); \ | |
271 | if (val) \ | |
272 | queue_flag_set(QUEUE_FLAG_##flag, q); \ | |
273 | else \ | |
274 | queue_flag_clear(QUEUE_FLAG_##flag, q); \ | |
275 | spin_unlock_irq(q->queue_lock); \ | |
276 | return ret; \ | |
1308835f BZ |
277 | } |
278 | ||
956bcb7c JA |
279 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
280 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
281 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
282 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 283 | |
797476b8 DLM |
284 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
285 | { | |
286 | switch (blk_queue_zoned_model(q)) { | |
287 | case BLK_ZONED_HA: | |
288 | return sprintf(page, "host-aware\n"); | |
289 | case BLK_ZONED_HM: | |
290 | return sprintf(page, "host-managed\n"); | |
291 | default: | |
292 | return sprintf(page, "none\n"); | |
293 | } | |
294 | } | |
295 | ||
ac9fafa1 AB |
296 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
297 | { | |
488991e2 AB |
298 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
299 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
300 | } |
301 | ||
302 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
303 | size_t count) | |
304 | { | |
305 | unsigned long nm; | |
306 | ssize_t ret = queue_var_store(&nm, page, count); | |
307 | ||
b1f3b64d DR |
308 | if (ret < 0) |
309 | return ret; | |
310 | ||
bf0f9702 | 311 | spin_lock_irq(q->queue_lock); |
488991e2 AB |
312 | queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
313 | queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
314 | if (nm == 2) | |
bf0f9702 | 315 | queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 AB |
316 | else if (nm) |
317 | queue_flag_set(QUEUE_FLAG_NOXMERGES, q); | |
bf0f9702 | 318 | spin_unlock_irq(q->queue_lock); |
1308835f | 319 | |
ac9fafa1 AB |
320 | return ret; |
321 | } | |
322 | ||
c7c22e4d JA |
323 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
324 | { | |
9cb308ce | 325 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 326 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 327 | |
5757a6d7 | 328 | return queue_var_show(set << force, page); |
c7c22e4d JA |
329 | } |
330 | ||
331 | static ssize_t | |
332 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
333 | { | |
334 | ssize_t ret = -EINVAL; | |
0a06ff06 | 335 | #ifdef CONFIG_SMP |
c7c22e4d JA |
336 | unsigned long val; |
337 | ||
338 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
339 | if (ret < 0) |
340 | return ret; | |
341 | ||
c7c22e4d | 342 | spin_lock_irq(q->queue_lock); |
e8037d49 | 343 | if (val == 2) { |
c7c22e4d | 344 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
e8037d49 ES |
345 | queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
346 | } else if (val == 1) { | |
347 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); | |
348 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
349 | } else if (val == 0) { | |
5757a6d7 DW |
350 | queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
351 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
352 | } | |
c7c22e4d JA |
353 | spin_unlock_irq(q->queue_lock); |
354 | #endif | |
355 | return ret; | |
356 | } | |
8324aa91 | 357 | |
06426adf JA |
358 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
359 | { | |
64f1c21e JA |
360 | int val; |
361 | ||
362 | if (q->poll_nsec == -1) | |
363 | val = -1; | |
364 | else | |
365 | val = q->poll_nsec / 1000; | |
366 | ||
367 | return sprintf(page, "%d\n", val); | |
06426adf JA |
368 | } |
369 | ||
370 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
371 | size_t count) | |
372 | { | |
64f1c21e | 373 | int err, val; |
06426adf JA |
374 | |
375 | if (!q->mq_ops || !q->mq_ops->poll) | |
376 | return -EINVAL; | |
377 | ||
64f1c21e JA |
378 | err = kstrtoint(page, 10, &val); |
379 | if (err < 0) | |
380 | return err; | |
06426adf | 381 | |
64f1c21e JA |
382 | if (val == -1) |
383 | q->poll_nsec = -1; | |
384 | else | |
385 | q->poll_nsec = val * 1000; | |
386 | ||
387 | return count; | |
06426adf JA |
388 | } |
389 | ||
05229bee JA |
390 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
391 | { | |
392 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
393 | } | |
394 | ||
395 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
396 | size_t count) | |
397 | { | |
398 | unsigned long poll_on; | |
399 | ssize_t ret; | |
400 | ||
401 | if (!q->mq_ops || !q->mq_ops->poll) | |
402 | return -EINVAL; | |
403 | ||
404 | ret = queue_var_store(&poll_on, page, count); | |
405 | if (ret < 0) | |
406 | return ret; | |
407 | ||
408 | spin_lock_irq(q->queue_lock); | |
409 | if (poll_on) | |
410 | queue_flag_set(QUEUE_FLAG_POLL, q); | |
411 | else | |
412 | queue_flag_clear(QUEUE_FLAG_POLL, q); | |
413 | spin_unlock_irq(q->queue_lock); | |
414 | ||
415 | return ret; | |
416 | } | |
417 | ||
87760e5e JA |
418 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
419 | { | |
420 | if (!q->rq_wb) | |
421 | return -EINVAL; | |
422 | ||
423 | return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000)); | |
424 | } | |
425 | ||
426 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
427 | size_t count) | |
428 | { | |
80e091d1 | 429 | struct rq_wb *rwb; |
87760e5e | 430 | ssize_t ret; |
80e091d1 | 431 | s64 val; |
87760e5e | 432 | |
87760e5e JA |
433 | ret = queue_var_store64(&val, page); |
434 | if (ret < 0) | |
435 | return ret; | |
d62118b6 JA |
436 | if (val < -1) |
437 | return -EINVAL; | |
438 | ||
439 | rwb = q->rq_wb; | |
440 | if (!rwb) { | |
441 | ret = wbt_init(q); | |
442 | if (ret) | |
443 | return ret; | |
444 | ||
445 | rwb = q->rq_wb; | |
446 | if (!rwb) | |
447 | return -EINVAL; | |
448 | } | |
87760e5e | 449 | |
80e091d1 JA |
450 | if (val == -1) |
451 | rwb->min_lat_nsec = wbt_default_latency_nsec(q); | |
452 | else if (val >= 0) | |
453 | rwb->min_lat_nsec = val * 1000ULL; | |
d62118b6 JA |
454 | |
455 | if (rwb->enable_state == WBT_STATE_ON_DEFAULT) | |
456 | rwb->enable_state = WBT_STATE_ON_MANUAL; | |
80e091d1 JA |
457 | |
458 | wbt_update_limits(rwb); | |
87760e5e JA |
459 | return count; |
460 | } | |
461 | ||
93e9d8e8 JA |
462 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
463 | { | |
464 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
465 | return sprintf(page, "write back\n"); | |
466 | ||
467 | return sprintf(page, "write through\n"); | |
468 | } | |
469 | ||
470 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
471 | size_t count) | |
472 | { | |
473 | int set = -1; | |
474 | ||
475 | if (!strncmp(page, "write back", 10)) | |
476 | set = 1; | |
477 | else if (!strncmp(page, "write through", 13) || | |
478 | !strncmp(page, "none", 4)) | |
479 | set = 0; | |
480 | ||
481 | if (set == -1) | |
482 | return -EINVAL; | |
483 | ||
484 | spin_lock_irq(q->queue_lock); | |
485 | if (set) | |
486 | queue_flag_set(QUEUE_FLAG_WC, q); | |
487 | else | |
488 | queue_flag_clear(QUEUE_FLAG_WC, q); | |
489 | spin_unlock_irq(q->queue_lock); | |
490 | ||
491 | return count; | |
492 | } | |
493 | ||
ea6ca600 YK |
494 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
495 | { | |
496 | return queue_var_show(blk_queue_dax(q), page); | |
497 | } | |
498 | ||
cf43e6be JA |
499 | static ssize_t print_stat(char *page, struct blk_rq_stat *stat, const char *pre) |
500 | { | |
501 | return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n", | |
502 | pre, (long long) stat->nr_samples, | |
503 | (long long) stat->mean, (long long) stat->min, | |
504 | (long long) stat->max); | |
505 | } | |
506 | ||
507 | static ssize_t queue_stats_show(struct request_queue *q, char *page) | |
508 | { | |
509 | struct blk_rq_stat stat[2]; | |
510 | ssize_t ret; | |
511 | ||
512 | blk_queue_stat_get(q, stat); | |
513 | ||
514 | ret = print_stat(page, &stat[BLK_STAT_READ], "read :"); | |
515 | ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:"); | |
516 | return ret; | |
517 | } | |
518 | ||
8324aa91 JA |
519 | static struct queue_sysfs_entry queue_requests_entry = { |
520 | .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, | |
521 | .show = queue_requests_show, | |
522 | .store = queue_requests_store, | |
523 | }; | |
524 | ||
525 | static struct queue_sysfs_entry queue_ra_entry = { | |
526 | .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, | |
527 | .show = queue_ra_show, | |
528 | .store = queue_ra_store, | |
529 | }; | |
530 | ||
531 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
532 | .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, | |
533 | .show = queue_max_sectors_show, | |
534 | .store = queue_max_sectors_store, | |
535 | }; | |
536 | ||
537 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
538 | .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO }, | |
539 | .show = queue_max_hw_sectors_show, | |
540 | }; | |
541 | ||
c77a5710 MP |
542 | static struct queue_sysfs_entry queue_max_segments_entry = { |
543 | .attr = {.name = "max_segments", .mode = S_IRUGO }, | |
544 | .show = queue_max_segments_show, | |
545 | }; | |
546 | ||
13f05c8d MP |
547 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
548 | .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, | |
549 | .show = queue_max_integrity_segments_show, | |
550 | }; | |
551 | ||
c77a5710 MP |
552 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
553 | .attr = {.name = "max_segment_size", .mode = S_IRUGO }, | |
554 | .show = queue_max_segment_size_show, | |
555 | }; | |
556 | ||
8324aa91 JA |
557 | static struct queue_sysfs_entry queue_iosched_entry = { |
558 | .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, | |
559 | .show = elv_iosched_show, | |
560 | .store = elv_iosched_store, | |
561 | }; | |
562 | ||
e68b903c MP |
563 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
564 | .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, | |
e1defc4f MP |
565 | .show = queue_logical_block_size_show, |
566 | }; | |
567 | ||
568 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
569 | .attr = {.name = "logical_block_size", .mode = S_IRUGO }, | |
570 | .show = queue_logical_block_size_show, | |
e68b903c MP |
571 | }; |
572 | ||
c72758f3 MP |
573 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
574 | .attr = {.name = "physical_block_size", .mode = S_IRUGO }, | |
575 | .show = queue_physical_block_size_show, | |
576 | }; | |
577 | ||
87caf97c HR |
578 | static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
579 | .attr = {.name = "chunk_sectors", .mode = S_IRUGO }, | |
580 | .show = queue_chunk_sectors_show, | |
581 | }; | |
582 | ||
c72758f3 MP |
583 | static struct queue_sysfs_entry queue_io_min_entry = { |
584 | .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, | |
585 | .show = queue_io_min_show, | |
586 | }; | |
587 | ||
588 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
589 | .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, | |
590 | .show = queue_io_opt_show, | |
e68b903c MP |
591 | }; |
592 | ||
86b37281 MP |
593 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
594 | .attr = {.name = "discard_granularity", .mode = S_IRUGO }, | |
595 | .show = queue_discard_granularity_show, | |
596 | }; | |
597 | ||
0034af03 JA |
598 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
599 | .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, | |
600 | .show = queue_discard_max_hw_show, | |
601 | }; | |
602 | ||
86b37281 | 603 | static struct queue_sysfs_entry queue_discard_max_entry = { |
0034af03 | 604 | .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
86b37281 | 605 | .show = queue_discard_max_show, |
0034af03 | 606 | .store = queue_discard_max_store, |
86b37281 MP |
607 | }; |
608 | ||
98262f27 MP |
609 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
610 | .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, | |
611 | .show = queue_discard_zeroes_data_show, | |
612 | }; | |
613 | ||
4363ac7c MP |
614 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
615 | .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, | |
616 | .show = queue_write_same_max_show, | |
617 | }; | |
618 | ||
a6f0788e CK |
619 | static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
620 | .attr = {.name = "write_zeroes_max_bytes", .mode = S_IRUGO }, | |
621 | .show = queue_write_zeroes_max_show, | |
622 | }; | |
623 | ||
1308835f BZ |
624 | static struct queue_sysfs_entry queue_nonrot_entry = { |
625 | .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
626 | .show = queue_show_nonrot, |
627 | .store = queue_store_nonrot, | |
1308835f BZ |
628 | }; |
629 | ||
797476b8 DLM |
630 | static struct queue_sysfs_entry queue_zoned_entry = { |
631 | .attr = {.name = "zoned", .mode = S_IRUGO }, | |
632 | .show = queue_zoned_show, | |
633 | }; | |
634 | ||
ac9fafa1 AB |
635 | static struct queue_sysfs_entry queue_nomerges_entry = { |
636 | .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, | |
637 | .show = queue_nomerges_show, | |
638 | .store = queue_nomerges_store, | |
639 | }; | |
640 | ||
c7c22e4d JA |
641 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
642 | .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, | |
643 | .show = queue_rq_affinity_show, | |
644 | .store = queue_rq_affinity_store, | |
645 | }; | |
646 | ||
bc58ba94 JA |
647 | static struct queue_sysfs_entry queue_iostats_entry = { |
648 | .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
649 | .show = queue_show_iostats, |
650 | .store = queue_store_iostats, | |
bc58ba94 JA |
651 | }; |
652 | ||
e2e1a148 JA |
653 | static struct queue_sysfs_entry queue_random_entry = { |
654 | .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
655 | .show = queue_show_random, |
656 | .store = queue_store_random, | |
e2e1a148 JA |
657 | }; |
658 | ||
05229bee JA |
659 | static struct queue_sysfs_entry queue_poll_entry = { |
660 | .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, | |
661 | .show = queue_poll_show, | |
662 | .store = queue_poll_store, | |
663 | }; | |
664 | ||
06426adf JA |
665 | static struct queue_sysfs_entry queue_poll_delay_entry = { |
666 | .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR }, | |
667 | .show = queue_poll_delay_show, | |
668 | .store = queue_poll_delay_store, | |
669 | }; | |
670 | ||
93e9d8e8 JA |
671 | static struct queue_sysfs_entry queue_wc_entry = { |
672 | .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR }, | |
673 | .show = queue_wc_show, | |
674 | .store = queue_wc_store, | |
675 | }; | |
676 | ||
ea6ca600 YK |
677 | static struct queue_sysfs_entry queue_dax_entry = { |
678 | .attr = {.name = "dax", .mode = S_IRUGO }, | |
679 | .show = queue_dax_show, | |
680 | }; | |
681 | ||
cf43e6be JA |
682 | static struct queue_sysfs_entry queue_stats_entry = { |
683 | .attr = {.name = "stats", .mode = S_IRUGO }, | |
684 | .show = queue_stats_show, | |
685 | }; | |
686 | ||
87760e5e JA |
687 | static struct queue_sysfs_entry queue_wb_lat_entry = { |
688 | .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR }, | |
689 | .show = queue_wb_lat_show, | |
690 | .store = queue_wb_lat_store, | |
691 | }; | |
692 | ||
8324aa91 JA |
693 | static struct attribute *default_attrs[] = { |
694 | &queue_requests_entry.attr, | |
695 | &queue_ra_entry.attr, | |
696 | &queue_max_hw_sectors_entry.attr, | |
697 | &queue_max_sectors_entry.attr, | |
c77a5710 | 698 | &queue_max_segments_entry.attr, |
13f05c8d | 699 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 700 | &queue_max_segment_size_entry.attr, |
8324aa91 | 701 | &queue_iosched_entry.attr, |
e68b903c | 702 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 703 | &queue_logical_block_size_entry.attr, |
c72758f3 | 704 | &queue_physical_block_size_entry.attr, |
87caf97c | 705 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
706 | &queue_io_min_entry.attr, |
707 | &queue_io_opt_entry.attr, | |
86b37281 MP |
708 | &queue_discard_granularity_entry.attr, |
709 | &queue_discard_max_entry.attr, | |
0034af03 | 710 | &queue_discard_max_hw_entry.attr, |
98262f27 | 711 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 712 | &queue_write_same_max_entry.attr, |
a6f0788e | 713 | &queue_write_zeroes_max_entry.attr, |
1308835f | 714 | &queue_nonrot_entry.attr, |
797476b8 | 715 | &queue_zoned_entry.attr, |
ac9fafa1 | 716 | &queue_nomerges_entry.attr, |
c7c22e4d | 717 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 718 | &queue_iostats_entry.attr, |
e2e1a148 | 719 | &queue_random_entry.attr, |
05229bee | 720 | &queue_poll_entry.attr, |
93e9d8e8 | 721 | &queue_wc_entry.attr, |
ea6ca600 | 722 | &queue_dax_entry.attr, |
cf43e6be | 723 | &queue_stats_entry.attr, |
87760e5e | 724 | &queue_wb_lat_entry.attr, |
06426adf | 725 | &queue_poll_delay_entry.attr, |
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 | /** |
499337bb AM |
781 | * blk_release_queue: - release a &struct request_queue when it is no longer needed |
782 | * @kobj: the kobj belonging to the request queue to be released | |
8324aa91 JA |
783 | * |
784 | * Description: | |
499337bb | 785 | * blk_release_queue is the pair to blk_init_queue() or |
8324aa91 JA |
786 | * blk_queue_make_request(). It should be called when a request queue is |
787 | * being released; typically when a block device is being de-registered. | |
788 | * Currently, its primary task it to free all the &struct request | |
789 | * structures that were allocated to the queue and the queue itself. | |
790 | * | |
45a9c9d9 BVA |
791 | * Note: |
792 | * The low level driver must have finished any outstanding requests first | |
793 | * via blk_cleanup_queue(). | |
8324aa91 JA |
794 | **/ |
795 | static void blk_release_queue(struct kobject *kobj) | |
796 | { | |
797 | struct request_queue *q = | |
798 | container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 799 | |
87760e5e | 800 | wbt_exit(q); |
b02176f3 | 801 | bdi_exit(&q->backing_dev_info); |
e8989fae TH |
802 | blkcg_exit_queue(q); |
803 | ||
7e5a8794 TH |
804 | if (q->elevator) { |
805 | spin_lock_irq(q->queue_lock); | |
806 | ioc_clear_queue(q); | |
807 | spin_unlock_irq(q->queue_lock); | |
777eb1bf | 808 | elevator_exit(q->elevator); |
7e5a8794 | 809 | } |
777eb1bf | 810 | |
a051661c | 811 | blk_exit_rl(&q->root_rl); |
8324aa91 JA |
812 | |
813 | if (q->queue_tags) | |
814 | __blk_queue_free_tags(q); | |
815 | ||
45a9c9d9 | 816 | if (!q->mq_ops) |
f70ced09 | 817 | blk_free_flush_queue(q->fq); |
e09aae7e ML |
818 | else |
819 | blk_mq_release(q); | |
18741986 | 820 | |
8324aa91 JA |
821 | blk_trace_shutdown(q); |
822 | ||
54efd50b KO |
823 | if (q->bio_split) |
824 | bioset_free(q->bio_split); | |
825 | ||
a73f730d | 826 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 827 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
828 | } |
829 | ||
52cf25d0 | 830 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
831 | .show = queue_attr_show, |
832 | .store = queue_attr_store, | |
833 | }; | |
834 | ||
835 | struct kobj_type blk_queue_ktype = { | |
836 | .sysfs_ops = &queue_sysfs_ops, | |
837 | .default_attrs = default_attrs, | |
838 | .release = blk_release_queue, | |
839 | }; | |
840 | ||
87760e5e JA |
841 | static void blk_wb_init(struct request_queue *q) |
842 | { | |
843 | #ifndef CONFIG_BLK_WBT_MQ | |
844 | if (q->mq_ops) | |
845 | return; | |
846 | #endif | |
847 | #ifndef CONFIG_BLK_WBT_SQ | |
848 | if (q->request_fn) | |
849 | return; | |
850 | #endif | |
851 | ||
852 | /* | |
853 | * If this fails, we don't get throttling | |
854 | */ | |
8054b89f | 855 | wbt_init(q); |
87760e5e JA |
856 | } |
857 | ||
8324aa91 JA |
858 | int blk_register_queue(struct gendisk *disk) |
859 | { | |
860 | int ret; | |
1d54ad6d | 861 | struct device *dev = disk_to_dev(disk); |
8324aa91 JA |
862 | struct request_queue *q = disk->queue; |
863 | ||
fb199746 | 864 | if (WARN_ON(!q)) |
8324aa91 JA |
865 | return -ENXIO; |
866 | ||
749fefe6 | 867 | /* |
17497acb TH |
868 | * SCSI probing may synchronously create and destroy a lot of |
869 | * request_queues for non-existent devices. Shutting down a fully | |
870 | * functional queue takes measureable wallclock time as RCU grace | |
871 | * periods are involved. To avoid excessive latency in these | |
872 | * cases, a request_queue starts out in a degraded mode which is | |
873 | * faster to shut down and is made fully functional here as | |
874 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 875 | */ |
df35c7c9 AS |
876 | if (!blk_queue_init_done(q)) { |
877 | queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); | |
3ef28e83 | 878 | percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c9 AS |
879 | blk_queue_bypass_end(q); |
880 | } | |
749fefe6 | 881 | |
1d54ad6d LZ |
882 | ret = blk_trace_init_sysfs(dev); |
883 | if (ret) | |
884 | return ret; | |
885 | ||
c9059598 | 886 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
887 | if (ret < 0) { |
888 | blk_trace_remove_sysfs(dev); | |
8324aa91 | 889 | return ret; |
ed5302d3 | 890 | } |
8324aa91 JA |
891 | |
892 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
893 | ||
320ae51f | 894 | if (q->mq_ops) |
b21d5b30 | 895 | blk_mq_register_dev(dev, q); |
320ae51f | 896 | |
87760e5e JA |
897 | blk_wb_init(q); |
898 | ||
cd43e26f MP |
899 | if (!q->request_fn) |
900 | return 0; | |
901 | ||
8324aa91 JA |
902 | ret = elv_register_queue(q); |
903 | if (ret) { | |
904 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
905 | kobject_del(&q->kobj); | |
80656b67 | 906 | blk_trace_remove_sysfs(dev); |
c87ffbb8 | 907 | kobject_put(&dev->kobj); |
8324aa91 JA |
908 | return ret; |
909 | } | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | void blk_unregister_queue(struct gendisk *disk) | |
915 | { | |
916 | struct request_queue *q = disk->queue; | |
917 | ||
fb199746 AM |
918 | if (WARN_ON(!q)) |
919 | return; | |
920 | ||
320ae51f | 921 | if (q->mq_ops) |
b21d5b30 | 922 | blk_mq_unregister_dev(disk_to_dev(disk), q); |
320ae51f | 923 | |
48c0d4d4 | 924 | if (q->request_fn) |
8324aa91 JA |
925 | elv_unregister_queue(q); |
926 | ||
48c0d4d4 ZK |
927 | kobject_uevent(&q->kobj, KOBJ_REMOVE); |
928 | kobject_del(&q->kobj); | |
929 | blk_trace_remove_sysfs(disk_to_dev(disk)); | |
930 | kobject_put(&disk_to_dev(disk)->kobj); | |
8324aa91 | 931 | } |