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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 | { | |
dc3b17cc | 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 | ||
dc3b17cc | 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 | ||
1e739730 CH |
124 | static ssize_t queue_max_discard_segments_show(struct request_queue *q, |
125 | char *page) | |
126 | { | |
127 | return queue_var_show(queue_max_discard_segments(q), (page)); | |
128 | } | |
129 | ||
13f05c8d MP |
130 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
131 | { | |
132 | return queue_var_show(q->limits.max_integrity_segments, (page)); | |
133 | } | |
134 | ||
c77a5710 MP |
135 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
136 | { | |
e692cb66 | 137 | if (blk_queue_cluster(q)) |
c77a5710 MP |
138 | return queue_var_show(queue_max_segment_size(q), (page)); |
139 | ||
09cbfeaf | 140 | return queue_var_show(PAGE_SIZE, (page)); |
c77a5710 MP |
141 | } |
142 | ||
e1defc4f | 143 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 144 | { |
e1defc4f | 145 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
146 | } |
147 | ||
c72758f3 MP |
148 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
149 | { | |
150 | return queue_var_show(queue_physical_block_size(q), page); | |
151 | } | |
152 | ||
87caf97c HR |
153 | static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
154 | { | |
155 | return queue_var_show(q->limits.chunk_sectors, page); | |
156 | } | |
157 | ||
c72758f3 MP |
158 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
159 | { | |
160 | return queue_var_show(queue_io_min(q), page); | |
161 | } | |
162 | ||
163 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
164 | { | |
165 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
166 | } |
167 | ||
86b37281 MP |
168 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
169 | { | |
170 | return queue_var_show(q->limits.discard_granularity, page); | |
171 | } | |
172 | ||
0034af03 JA |
173 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
174 | { | |
0034af03 | 175 | |
18f922d0 A |
176 | return sprintf(page, "%llu\n", |
177 | (unsigned long long)q->limits.max_hw_discard_sectors << 9); | |
0034af03 JA |
178 | } |
179 | ||
86b37281 MP |
180 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
181 | { | |
a934a00a MP |
182 | return sprintf(page, "%llu\n", |
183 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
184 | } |
185 | ||
0034af03 JA |
186 | static ssize_t queue_discard_max_store(struct request_queue *q, |
187 | const char *page, size_t count) | |
188 | { | |
189 | unsigned long max_discard; | |
190 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
191 | ||
192 | if (ret < 0) | |
193 | return ret; | |
194 | ||
195 | if (max_discard & (q->limits.discard_granularity - 1)) | |
196 | return -EINVAL; | |
197 | ||
198 | max_discard >>= 9; | |
199 | if (max_discard > UINT_MAX) | |
200 | return -EINVAL; | |
201 | ||
202 | if (max_discard > q->limits.max_hw_discard_sectors) | |
203 | max_discard = q->limits.max_hw_discard_sectors; | |
204 | ||
205 | q->limits.max_discard_sectors = max_discard; | |
206 | return ret; | |
207 | } | |
208 | ||
98262f27 MP |
209 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
210 | { | |
211 | return queue_var_show(queue_discard_zeroes_data(q), page); | |
212 | } | |
213 | ||
4363ac7c MP |
214 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
215 | { | |
216 | return sprintf(page, "%llu\n", | |
217 | (unsigned long long)q->limits.max_write_same_sectors << 9); | |
218 | } | |
219 | ||
a6f0788e CK |
220 | static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
221 | { | |
222 | return sprintf(page, "%llu\n", | |
223 | (unsigned long long)q->limits.max_write_zeroes_sectors << 9); | |
224 | } | |
4363ac7c | 225 | |
8324aa91 JA |
226 | static ssize_t |
227 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
228 | { | |
229 | unsigned long max_sectors_kb, | |
ae03bf63 | 230 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
09cbfeaf | 231 | page_kb = 1 << (PAGE_SHIFT - 10); |
8324aa91 JA |
232 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
233 | ||
b1f3b64d DR |
234 | if (ret < 0) |
235 | return ret; | |
236 | ||
ca369d51 MP |
237 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
238 | q->limits.max_dev_sectors >> 1); | |
239 | ||
8324aa91 JA |
240 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
241 | return -EINVAL; | |
7c239517 | 242 | |
8324aa91 | 243 | spin_lock_irq(q->queue_lock); |
c295fc05 | 244 | q->limits.max_sectors = max_sectors_kb << 1; |
dc3b17cc | 245 | q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10); |
8324aa91 JA |
246 | spin_unlock_irq(q->queue_lock); |
247 | ||
248 | return ret; | |
249 | } | |
250 | ||
251 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
252 | { | |
ae03bf63 | 253 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
254 | |
255 | return queue_var_show(max_hw_sectors_kb, (page)); | |
256 | } | |
257 | ||
956bcb7c JA |
258 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
259 | static ssize_t \ | |
260 | queue_show_##name(struct request_queue *q, char *page) \ | |
261 | { \ | |
262 | int bit; \ | |
263 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
264 | return queue_var_show(neg ? !bit : bit, page); \ | |
265 | } \ | |
266 | static ssize_t \ | |
267 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
268 | { \ | |
269 | unsigned long val; \ | |
270 | ssize_t ret; \ | |
271 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
272 | if (ret < 0) \ |
273 | return ret; \ | |
956bcb7c JA |
274 | if (neg) \ |
275 | val = !val; \ | |
276 | \ | |
277 | spin_lock_irq(q->queue_lock); \ | |
278 | if (val) \ | |
279 | queue_flag_set(QUEUE_FLAG_##flag, q); \ | |
280 | else \ | |
281 | queue_flag_clear(QUEUE_FLAG_##flag, q); \ | |
282 | spin_unlock_irq(q->queue_lock); \ | |
283 | return ret; \ | |
1308835f BZ |
284 | } |
285 | ||
956bcb7c JA |
286 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
287 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
288 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
289 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 290 | |
797476b8 DLM |
291 | static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
292 | { | |
293 | switch (blk_queue_zoned_model(q)) { | |
294 | case BLK_ZONED_HA: | |
295 | return sprintf(page, "host-aware\n"); | |
296 | case BLK_ZONED_HM: | |
297 | return sprintf(page, "host-managed\n"); | |
298 | default: | |
299 | return sprintf(page, "none\n"); | |
300 | } | |
301 | } | |
302 | ||
ac9fafa1 AB |
303 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
304 | { | |
488991e2 AB |
305 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
306 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
307 | } |
308 | ||
309 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
310 | size_t count) | |
311 | { | |
312 | unsigned long nm; | |
313 | ssize_t ret = queue_var_store(&nm, page, count); | |
314 | ||
b1f3b64d DR |
315 | if (ret < 0) |
316 | return ret; | |
317 | ||
bf0f9702 | 318 | spin_lock_irq(q->queue_lock); |
488991e2 AB |
319 | queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
320 | queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
321 | if (nm == 2) | |
bf0f9702 | 322 | queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 AB |
323 | else if (nm) |
324 | queue_flag_set(QUEUE_FLAG_NOXMERGES, q); | |
bf0f9702 | 325 | spin_unlock_irq(q->queue_lock); |
1308835f | 326 | |
ac9fafa1 AB |
327 | return ret; |
328 | } | |
329 | ||
c7c22e4d JA |
330 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
331 | { | |
9cb308ce | 332 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 333 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 334 | |
5757a6d7 | 335 | return queue_var_show(set << force, page); |
c7c22e4d JA |
336 | } |
337 | ||
338 | static ssize_t | |
339 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
340 | { | |
341 | ssize_t ret = -EINVAL; | |
0a06ff06 | 342 | #ifdef CONFIG_SMP |
c7c22e4d JA |
343 | unsigned long val; |
344 | ||
345 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
346 | if (ret < 0) |
347 | return ret; | |
348 | ||
c7c22e4d | 349 | spin_lock_irq(q->queue_lock); |
e8037d49 | 350 | if (val == 2) { |
c7c22e4d | 351 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
e8037d49 ES |
352 | queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
353 | } else if (val == 1) { | |
354 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); | |
355 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
356 | } else if (val == 0) { | |
5757a6d7 DW |
357 | queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
358 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
359 | } | |
c7c22e4d JA |
360 | spin_unlock_irq(q->queue_lock); |
361 | #endif | |
362 | return ret; | |
363 | } | |
8324aa91 | 364 | |
06426adf JA |
365 | static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
366 | { | |
64f1c21e JA |
367 | int val; |
368 | ||
369 | if (q->poll_nsec == -1) | |
370 | val = -1; | |
371 | else | |
372 | val = q->poll_nsec / 1000; | |
373 | ||
374 | return sprintf(page, "%d\n", val); | |
06426adf JA |
375 | } |
376 | ||
377 | static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, | |
378 | size_t count) | |
379 | { | |
64f1c21e | 380 | int err, val; |
06426adf JA |
381 | |
382 | if (!q->mq_ops || !q->mq_ops->poll) | |
383 | return -EINVAL; | |
384 | ||
64f1c21e JA |
385 | err = kstrtoint(page, 10, &val); |
386 | if (err < 0) | |
387 | return err; | |
06426adf | 388 | |
64f1c21e JA |
389 | if (val == -1) |
390 | q->poll_nsec = -1; | |
391 | else | |
392 | q->poll_nsec = val * 1000; | |
393 | ||
394 | return count; | |
06426adf JA |
395 | } |
396 | ||
05229bee JA |
397 | static ssize_t queue_poll_show(struct request_queue *q, char *page) |
398 | { | |
399 | return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); | |
400 | } | |
401 | ||
402 | static ssize_t queue_poll_store(struct request_queue *q, const char *page, | |
403 | size_t count) | |
404 | { | |
405 | unsigned long poll_on; | |
406 | ssize_t ret; | |
407 | ||
408 | if (!q->mq_ops || !q->mq_ops->poll) | |
409 | return -EINVAL; | |
410 | ||
411 | ret = queue_var_store(&poll_on, page, count); | |
412 | if (ret < 0) | |
413 | return ret; | |
414 | ||
415 | spin_lock_irq(q->queue_lock); | |
416 | if (poll_on) | |
417 | queue_flag_set(QUEUE_FLAG_POLL, q); | |
418 | else | |
419 | queue_flag_clear(QUEUE_FLAG_POLL, q); | |
420 | spin_unlock_irq(q->queue_lock); | |
421 | ||
422 | return ret; | |
423 | } | |
424 | ||
87760e5e JA |
425 | static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
426 | { | |
427 | if (!q->rq_wb) | |
428 | return -EINVAL; | |
429 | ||
430 | return sprintf(page, "%llu\n", div_u64(q->rq_wb->min_lat_nsec, 1000)); | |
431 | } | |
432 | ||
433 | static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, | |
434 | size_t count) | |
435 | { | |
80e091d1 | 436 | struct rq_wb *rwb; |
87760e5e | 437 | ssize_t ret; |
80e091d1 | 438 | s64 val; |
87760e5e | 439 | |
87760e5e JA |
440 | ret = queue_var_store64(&val, page); |
441 | if (ret < 0) | |
442 | return ret; | |
d62118b6 JA |
443 | if (val < -1) |
444 | return -EINVAL; | |
445 | ||
446 | rwb = q->rq_wb; | |
447 | if (!rwb) { | |
448 | ret = wbt_init(q); | |
449 | if (ret) | |
450 | return ret; | |
451 | ||
452 | rwb = q->rq_wb; | |
453 | if (!rwb) | |
454 | return -EINVAL; | |
455 | } | |
87760e5e | 456 | |
80e091d1 JA |
457 | if (val == -1) |
458 | rwb->min_lat_nsec = wbt_default_latency_nsec(q); | |
459 | else if (val >= 0) | |
460 | rwb->min_lat_nsec = val * 1000ULL; | |
d62118b6 JA |
461 | |
462 | if (rwb->enable_state == WBT_STATE_ON_DEFAULT) | |
463 | rwb->enable_state = WBT_STATE_ON_MANUAL; | |
80e091d1 JA |
464 | |
465 | wbt_update_limits(rwb); | |
87760e5e JA |
466 | return count; |
467 | } | |
468 | ||
93e9d8e8 JA |
469 | static ssize_t queue_wc_show(struct request_queue *q, char *page) |
470 | { | |
471 | if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) | |
472 | return sprintf(page, "write back\n"); | |
473 | ||
474 | return sprintf(page, "write through\n"); | |
475 | } | |
476 | ||
477 | static ssize_t queue_wc_store(struct request_queue *q, const char *page, | |
478 | size_t count) | |
479 | { | |
480 | int set = -1; | |
481 | ||
482 | if (!strncmp(page, "write back", 10)) | |
483 | set = 1; | |
484 | else if (!strncmp(page, "write through", 13) || | |
485 | !strncmp(page, "none", 4)) | |
486 | set = 0; | |
487 | ||
488 | if (set == -1) | |
489 | return -EINVAL; | |
490 | ||
491 | spin_lock_irq(q->queue_lock); | |
492 | if (set) | |
493 | queue_flag_set(QUEUE_FLAG_WC, q); | |
494 | else | |
495 | queue_flag_clear(QUEUE_FLAG_WC, q); | |
496 | spin_unlock_irq(q->queue_lock); | |
497 | ||
498 | return count; | |
499 | } | |
500 | ||
ea6ca600 YK |
501 | static ssize_t queue_dax_show(struct request_queue *q, char *page) |
502 | { | |
503 | return queue_var_show(blk_queue_dax(q), page); | |
504 | } | |
505 | ||
cf43e6be JA |
506 | static ssize_t print_stat(char *page, struct blk_rq_stat *stat, const char *pre) |
507 | { | |
508 | return sprintf(page, "%s samples=%llu, mean=%lld, min=%lld, max=%lld\n", | |
509 | pre, (long long) stat->nr_samples, | |
510 | (long long) stat->mean, (long long) stat->min, | |
511 | (long long) stat->max); | |
512 | } | |
513 | ||
514 | static ssize_t queue_stats_show(struct request_queue *q, char *page) | |
515 | { | |
516 | struct blk_rq_stat stat[2]; | |
517 | ssize_t ret; | |
518 | ||
519 | blk_queue_stat_get(q, stat); | |
520 | ||
521 | ret = print_stat(page, &stat[BLK_STAT_READ], "read :"); | |
522 | ret += print_stat(page + ret, &stat[BLK_STAT_WRITE], "write:"); | |
523 | return ret; | |
524 | } | |
525 | ||
8324aa91 JA |
526 | static struct queue_sysfs_entry queue_requests_entry = { |
527 | .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, | |
528 | .show = queue_requests_show, | |
529 | .store = queue_requests_store, | |
530 | }; | |
531 | ||
532 | static struct queue_sysfs_entry queue_ra_entry = { | |
533 | .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, | |
534 | .show = queue_ra_show, | |
535 | .store = queue_ra_store, | |
536 | }; | |
537 | ||
538 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
539 | .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, | |
540 | .show = queue_max_sectors_show, | |
541 | .store = queue_max_sectors_store, | |
542 | }; | |
543 | ||
544 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
545 | .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO }, | |
546 | .show = queue_max_hw_sectors_show, | |
547 | }; | |
548 | ||
c77a5710 MP |
549 | static struct queue_sysfs_entry queue_max_segments_entry = { |
550 | .attr = {.name = "max_segments", .mode = S_IRUGO }, | |
551 | .show = queue_max_segments_show, | |
552 | }; | |
553 | ||
1e739730 CH |
554 | static struct queue_sysfs_entry queue_max_discard_segments_entry = { |
555 | .attr = {.name = "max_discard_segments", .mode = S_IRUGO }, | |
556 | .show = queue_max_discard_segments_show, | |
557 | }; | |
558 | ||
13f05c8d MP |
559 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
560 | .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, | |
561 | .show = queue_max_integrity_segments_show, | |
562 | }; | |
563 | ||
c77a5710 MP |
564 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
565 | .attr = {.name = "max_segment_size", .mode = S_IRUGO }, | |
566 | .show = queue_max_segment_size_show, | |
567 | }; | |
568 | ||
8324aa91 JA |
569 | static struct queue_sysfs_entry queue_iosched_entry = { |
570 | .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, | |
571 | .show = elv_iosched_show, | |
572 | .store = elv_iosched_store, | |
573 | }; | |
574 | ||
e68b903c MP |
575 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
576 | .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, | |
e1defc4f MP |
577 | .show = queue_logical_block_size_show, |
578 | }; | |
579 | ||
580 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
581 | .attr = {.name = "logical_block_size", .mode = S_IRUGO }, | |
582 | .show = queue_logical_block_size_show, | |
e68b903c MP |
583 | }; |
584 | ||
c72758f3 MP |
585 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
586 | .attr = {.name = "physical_block_size", .mode = S_IRUGO }, | |
587 | .show = queue_physical_block_size_show, | |
588 | }; | |
589 | ||
87caf97c HR |
590 | static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
591 | .attr = {.name = "chunk_sectors", .mode = S_IRUGO }, | |
592 | .show = queue_chunk_sectors_show, | |
593 | }; | |
594 | ||
c72758f3 MP |
595 | static struct queue_sysfs_entry queue_io_min_entry = { |
596 | .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, | |
597 | .show = queue_io_min_show, | |
598 | }; | |
599 | ||
600 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
601 | .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, | |
602 | .show = queue_io_opt_show, | |
e68b903c MP |
603 | }; |
604 | ||
86b37281 MP |
605 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
606 | .attr = {.name = "discard_granularity", .mode = S_IRUGO }, | |
607 | .show = queue_discard_granularity_show, | |
608 | }; | |
609 | ||
0034af03 JA |
610 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
611 | .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, | |
612 | .show = queue_discard_max_hw_show, | |
613 | }; | |
614 | ||
86b37281 | 615 | static struct queue_sysfs_entry queue_discard_max_entry = { |
0034af03 | 616 | .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
86b37281 | 617 | .show = queue_discard_max_show, |
0034af03 | 618 | .store = queue_discard_max_store, |
86b37281 MP |
619 | }; |
620 | ||
98262f27 MP |
621 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
622 | .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, | |
623 | .show = queue_discard_zeroes_data_show, | |
624 | }; | |
625 | ||
4363ac7c MP |
626 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
627 | .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, | |
628 | .show = queue_write_same_max_show, | |
629 | }; | |
630 | ||
a6f0788e CK |
631 | static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
632 | .attr = {.name = "write_zeroes_max_bytes", .mode = S_IRUGO }, | |
633 | .show = queue_write_zeroes_max_show, | |
634 | }; | |
635 | ||
1308835f BZ |
636 | static struct queue_sysfs_entry queue_nonrot_entry = { |
637 | .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
638 | .show = queue_show_nonrot, |
639 | .store = queue_store_nonrot, | |
1308835f BZ |
640 | }; |
641 | ||
797476b8 DLM |
642 | static struct queue_sysfs_entry queue_zoned_entry = { |
643 | .attr = {.name = "zoned", .mode = S_IRUGO }, | |
644 | .show = queue_zoned_show, | |
645 | }; | |
646 | ||
ac9fafa1 AB |
647 | static struct queue_sysfs_entry queue_nomerges_entry = { |
648 | .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, | |
649 | .show = queue_nomerges_show, | |
650 | .store = queue_nomerges_store, | |
651 | }; | |
652 | ||
c7c22e4d JA |
653 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
654 | .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, | |
655 | .show = queue_rq_affinity_show, | |
656 | .store = queue_rq_affinity_store, | |
657 | }; | |
658 | ||
bc58ba94 JA |
659 | static struct queue_sysfs_entry queue_iostats_entry = { |
660 | .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
661 | .show = queue_show_iostats, |
662 | .store = queue_store_iostats, | |
bc58ba94 JA |
663 | }; |
664 | ||
e2e1a148 JA |
665 | static struct queue_sysfs_entry queue_random_entry = { |
666 | .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
667 | .show = queue_show_random, |
668 | .store = queue_store_random, | |
e2e1a148 JA |
669 | }; |
670 | ||
05229bee JA |
671 | static struct queue_sysfs_entry queue_poll_entry = { |
672 | .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, | |
673 | .show = queue_poll_show, | |
674 | .store = queue_poll_store, | |
675 | }; | |
676 | ||
06426adf JA |
677 | static struct queue_sysfs_entry queue_poll_delay_entry = { |
678 | .attr = {.name = "io_poll_delay", .mode = S_IRUGO | S_IWUSR }, | |
679 | .show = queue_poll_delay_show, | |
680 | .store = queue_poll_delay_store, | |
681 | }; | |
682 | ||
93e9d8e8 JA |
683 | static struct queue_sysfs_entry queue_wc_entry = { |
684 | .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR }, | |
685 | .show = queue_wc_show, | |
686 | .store = queue_wc_store, | |
687 | }; | |
688 | ||
ea6ca600 YK |
689 | static struct queue_sysfs_entry queue_dax_entry = { |
690 | .attr = {.name = "dax", .mode = S_IRUGO }, | |
691 | .show = queue_dax_show, | |
692 | }; | |
693 | ||
cf43e6be JA |
694 | static struct queue_sysfs_entry queue_stats_entry = { |
695 | .attr = {.name = "stats", .mode = S_IRUGO }, | |
696 | .show = queue_stats_show, | |
697 | }; | |
698 | ||
87760e5e JA |
699 | static struct queue_sysfs_entry queue_wb_lat_entry = { |
700 | .attr = {.name = "wbt_lat_usec", .mode = S_IRUGO | S_IWUSR }, | |
701 | .show = queue_wb_lat_show, | |
702 | .store = queue_wb_lat_store, | |
703 | }; | |
704 | ||
8324aa91 JA |
705 | static struct attribute *default_attrs[] = { |
706 | &queue_requests_entry.attr, | |
707 | &queue_ra_entry.attr, | |
708 | &queue_max_hw_sectors_entry.attr, | |
709 | &queue_max_sectors_entry.attr, | |
c77a5710 | 710 | &queue_max_segments_entry.attr, |
1e739730 | 711 | &queue_max_discard_segments_entry.attr, |
13f05c8d | 712 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 713 | &queue_max_segment_size_entry.attr, |
8324aa91 | 714 | &queue_iosched_entry.attr, |
e68b903c | 715 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 716 | &queue_logical_block_size_entry.attr, |
c72758f3 | 717 | &queue_physical_block_size_entry.attr, |
87caf97c | 718 | &queue_chunk_sectors_entry.attr, |
c72758f3 MP |
719 | &queue_io_min_entry.attr, |
720 | &queue_io_opt_entry.attr, | |
86b37281 MP |
721 | &queue_discard_granularity_entry.attr, |
722 | &queue_discard_max_entry.attr, | |
0034af03 | 723 | &queue_discard_max_hw_entry.attr, |
98262f27 | 724 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 725 | &queue_write_same_max_entry.attr, |
a6f0788e | 726 | &queue_write_zeroes_max_entry.attr, |
1308835f | 727 | &queue_nonrot_entry.attr, |
797476b8 | 728 | &queue_zoned_entry.attr, |
ac9fafa1 | 729 | &queue_nomerges_entry.attr, |
c7c22e4d | 730 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 731 | &queue_iostats_entry.attr, |
e2e1a148 | 732 | &queue_random_entry.attr, |
05229bee | 733 | &queue_poll_entry.attr, |
93e9d8e8 | 734 | &queue_wc_entry.attr, |
ea6ca600 | 735 | &queue_dax_entry.attr, |
cf43e6be | 736 | &queue_stats_entry.attr, |
87760e5e | 737 | &queue_wb_lat_entry.attr, |
06426adf | 738 | &queue_poll_delay_entry.attr, |
8324aa91 JA |
739 | NULL, |
740 | }; | |
741 | ||
742 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) | |
743 | ||
744 | static ssize_t | |
745 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
746 | { | |
747 | struct queue_sysfs_entry *entry = to_queue(attr); | |
748 | struct request_queue *q = | |
749 | container_of(kobj, struct request_queue, kobj); | |
750 | ssize_t res; | |
751 | ||
752 | if (!entry->show) | |
753 | return -EIO; | |
754 | mutex_lock(&q->sysfs_lock); | |
3f3299d5 | 755 | if (blk_queue_dying(q)) { |
8324aa91 JA |
756 | mutex_unlock(&q->sysfs_lock); |
757 | return -ENOENT; | |
758 | } | |
759 | res = entry->show(q, page); | |
760 | mutex_unlock(&q->sysfs_lock); | |
761 | return res; | |
762 | } | |
763 | ||
764 | static ssize_t | |
765 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
766 | const char *page, size_t length) | |
767 | { | |
768 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 769 | struct request_queue *q; |
8324aa91 JA |
770 | ssize_t res; |
771 | ||
772 | if (!entry->store) | |
773 | return -EIO; | |
6728cb0e JA |
774 | |
775 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 776 | mutex_lock(&q->sysfs_lock); |
3f3299d5 | 777 | if (blk_queue_dying(q)) { |
8324aa91 JA |
778 | mutex_unlock(&q->sysfs_lock); |
779 | return -ENOENT; | |
780 | } | |
781 | res = entry->store(q, page, length); | |
782 | mutex_unlock(&q->sysfs_lock); | |
783 | return res; | |
784 | } | |
785 | ||
548bc8e1 TH |
786 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
787 | { | |
788 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
789 | rcu_head); | |
790 | kmem_cache_free(blk_requestq_cachep, q); | |
791 | } | |
792 | ||
8324aa91 | 793 | /** |
499337bb AM |
794 | * blk_release_queue: - release a &struct request_queue when it is no longer needed |
795 | * @kobj: the kobj belonging to the request queue to be released | |
8324aa91 JA |
796 | * |
797 | * Description: | |
499337bb | 798 | * blk_release_queue is the pair to blk_init_queue() or |
8324aa91 JA |
799 | * blk_queue_make_request(). It should be called when a request queue is |
800 | * being released; typically when a block device is being de-registered. | |
801 | * Currently, its primary task it to free all the &struct request | |
802 | * structures that were allocated to the queue and the queue itself. | |
803 | * | |
45a9c9d9 BVA |
804 | * Note: |
805 | * The low level driver must have finished any outstanding requests first | |
806 | * via blk_cleanup_queue(). | |
8324aa91 JA |
807 | **/ |
808 | static void blk_release_queue(struct kobject *kobj) | |
809 | { | |
810 | struct request_queue *q = | |
811 | container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 812 | |
87760e5e | 813 | wbt_exit(q); |
d03f6cdc | 814 | bdi_put(q->backing_dev_info); |
e8989fae TH |
815 | blkcg_exit_queue(q); |
816 | ||
7e5a8794 | 817 | if (q->elevator) { |
7e5a8794 | 818 | ioc_clear_queue(q); |
54d5329d | 819 | elevator_exit(q, q->elevator); |
7e5a8794 | 820 | } |
777eb1bf | 821 | |
a051661c | 822 | blk_exit_rl(&q->root_rl); |
8324aa91 JA |
823 | |
824 | if (q->queue_tags) | |
825 | __blk_queue_free_tags(q); | |
826 | ||
6d247d7f CH |
827 | if (!q->mq_ops) { |
828 | if (q->exit_rq_fn) | |
829 | q->exit_rq_fn(q, q->fq->flush_rq); | |
f70ced09 | 830 | blk_free_flush_queue(q->fq); |
6d247d7f | 831 | } else { |
e09aae7e | 832 | blk_mq_release(q); |
6d247d7f | 833 | } |
18741986 | 834 | |
8324aa91 JA |
835 | blk_trace_shutdown(q); |
836 | ||
62ebce16 OS |
837 | if (q->mq_ops) |
838 | blk_mq_debugfs_unregister(q); | |
839 | ||
54efd50b KO |
840 | if (q->bio_split) |
841 | bioset_free(q->bio_split); | |
842 | ||
a73f730d | 843 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 844 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
845 | } |
846 | ||
52cf25d0 | 847 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
848 | .show = queue_attr_show, |
849 | .store = queue_attr_store, | |
850 | }; | |
851 | ||
852 | struct kobj_type blk_queue_ktype = { | |
853 | .sysfs_ops = &queue_sysfs_ops, | |
854 | .default_attrs = default_attrs, | |
855 | .release = blk_release_queue, | |
856 | }; | |
857 | ||
87760e5e JA |
858 | static void blk_wb_init(struct request_queue *q) |
859 | { | |
860 | #ifndef CONFIG_BLK_WBT_MQ | |
861 | if (q->mq_ops) | |
862 | return; | |
863 | #endif | |
864 | #ifndef CONFIG_BLK_WBT_SQ | |
865 | if (q->request_fn) | |
866 | return; | |
867 | #endif | |
868 | ||
869 | /* | |
870 | * If this fails, we don't get throttling | |
871 | */ | |
8054b89f | 872 | wbt_init(q); |
87760e5e JA |
873 | } |
874 | ||
8324aa91 JA |
875 | int blk_register_queue(struct gendisk *disk) |
876 | { | |
877 | int ret; | |
1d54ad6d | 878 | struct device *dev = disk_to_dev(disk); |
8324aa91 JA |
879 | struct request_queue *q = disk->queue; |
880 | ||
fb199746 | 881 | if (WARN_ON(!q)) |
8324aa91 JA |
882 | return -ENXIO; |
883 | ||
749fefe6 | 884 | /* |
17497acb TH |
885 | * SCSI probing may synchronously create and destroy a lot of |
886 | * request_queues for non-existent devices. Shutting down a fully | |
887 | * functional queue takes measureable wallclock time as RCU grace | |
888 | * periods are involved. To avoid excessive latency in these | |
889 | * cases, a request_queue starts out in a degraded mode which is | |
890 | * faster to shut down and is made fully functional here as | |
891 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 892 | */ |
df35c7c9 AS |
893 | if (!blk_queue_init_done(q)) { |
894 | queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); | |
3ef28e83 | 895 | percpu_ref_switch_to_percpu(&q->q_usage_counter); |
df35c7c9 AS |
896 | blk_queue_bypass_end(q); |
897 | } | |
749fefe6 | 898 | |
1d54ad6d LZ |
899 | ret = blk_trace_init_sysfs(dev); |
900 | if (ret) | |
901 | return ret; | |
902 | ||
b410aff2 TE |
903 | if (q->mq_ops) |
904 | blk_mq_register_dev(dev, q); | |
905 | ||
906 | /* Prevent changes through sysfs until registration is completed. */ | |
907 | mutex_lock(&q->sysfs_lock); | |
908 | ||
c9059598 | 909 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
910 | if (ret < 0) { |
911 | blk_trace_remove_sysfs(dev); | |
b410aff2 | 912 | goto unlock; |
ed5302d3 | 913 | } |
8324aa91 JA |
914 | |
915 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
916 | ||
87760e5e JA |
917 | blk_wb_init(q); |
918 | ||
80c6b157 OS |
919 | if (q->request_fn || (q->mq_ops && q->elevator)) { |
920 | ret = elv_register_queue(q); | |
921 | if (ret) { | |
922 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
923 | kobject_del(&q->kobj); | |
924 | blk_trace_remove_sysfs(dev); | |
925 | kobject_put(&dev->kobj); | |
b410aff2 | 926 | goto unlock; |
80c6b157 | 927 | } |
8324aa91 | 928 | } |
b410aff2 TE |
929 | ret = 0; |
930 | unlock: | |
931 | mutex_unlock(&q->sysfs_lock); | |
932 | return ret; | |
8324aa91 JA |
933 | } |
934 | ||
935 | void blk_unregister_queue(struct gendisk *disk) | |
936 | { | |
937 | struct request_queue *q = disk->queue; | |
938 | ||
fb199746 AM |
939 | if (WARN_ON(!q)) |
940 | return; | |
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 | } |