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" |
8324aa91 JA |
16 | |
17 | struct queue_sysfs_entry { | |
18 | struct attribute attr; | |
19 | ssize_t (*show)(struct request_queue *, char *); | |
20 | ssize_t (*store)(struct request_queue *, const char *, size_t); | |
21 | }; | |
22 | ||
23 | static ssize_t | |
9cb308ce | 24 | queue_var_show(unsigned long var, char *page) |
8324aa91 | 25 | { |
9cb308ce | 26 | return sprintf(page, "%lu\n", var); |
8324aa91 JA |
27 | } |
28 | ||
29 | static ssize_t | |
30 | queue_var_store(unsigned long *var, const char *page, size_t count) | |
31 | { | |
b1f3b64d DR |
32 | int err; |
33 | unsigned long v; | |
34 | ||
ed751e68 | 35 | err = kstrtoul(page, 10, &v); |
b1f3b64d DR |
36 | if (err || v > UINT_MAX) |
37 | return -EINVAL; | |
38 | ||
39 | *var = v; | |
8324aa91 | 40 | |
8324aa91 JA |
41 | return count; |
42 | } | |
43 | ||
44 | static ssize_t queue_requests_show(struct request_queue *q, char *page) | |
45 | { | |
46 | return queue_var_show(q->nr_requests, (page)); | |
47 | } | |
48 | ||
49 | static ssize_t | |
50 | queue_requests_store(struct request_queue *q, const char *page, size_t count) | |
51 | { | |
8324aa91 | 52 | unsigned long nr; |
e3a2b3f9 | 53 | int ret, err; |
b8a9ae77 | 54 | |
e3a2b3f9 | 55 | if (!q->request_fn && !q->mq_ops) |
b8a9ae77 JA |
56 | return -EINVAL; |
57 | ||
58 | ret = queue_var_store(&nr, page, count); | |
b1f3b64d DR |
59 | if (ret < 0) |
60 | return ret; | |
61 | ||
8324aa91 JA |
62 | if (nr < BLKDEV_MIN_RQ) |
63 | nr = BLKDEV_MIN_RQ; | |
64 | ||
e3a2b3f9 JA |
65 | if (q->request_fn) |
66 | err = blk_update_nr_requests(q, nr); | |
67 | else | |
68 | err = blk_mq_update_nr_requests(q, nr); | |
69 | ||
70 | if (err) | |
71 | return err; | |
72 | ||
8324aa91 JA |
73 | return ret; |
74 | } | |
75 | ||
76 | static ssize_t queue_ra_show(struct request_queue *q, char *page) | |
77 | { | |
9cb308ce XF |
78 | unsigned long ra_kb = q->backing_dev_info.ra_pages << |
79 | (PAGE_CACHE_SHIFT - 10); | |
8324aa91 JA |
80 | |
81 | return queue_var_show(ra_kb, (page)); | |
82 | } | |
83 | ||
84 | static ssize_t | |
85 | queue_ra_store(struct request_queue *q, const char *page, size_t count) | |
86 | { | |
87 | unsigned long ra_kb; | |
88 | ssize_t ret = queue_var_store(&ra_kb, page, count); | |
89 | ||
b1f3b64d DR |
90 | if (ret < 0) |
91 | return ret; | |
92 | ||
8324aa91 | 93 | q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10); |
8324aa91 JA |
94 | |
95 | return ret; | |
96 | } | |
97 | ||
98 | static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) | |
99 | { | |
ae03bf63 | 100 | int max_sectors_kb = queue_max_sectors(q) >> 1; |
8324aa91 JA |
101 | |
102 | return queue_var_show(max_sectors_kb, (page)); | |
103 | } | |
104 | ||
c77a5710 MP |
105 | static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
106 | { | |
107 | return queue_var_show(queue_max_segments(q), (page)); | |
108 | } | |
109 | ||
13f05c8d MP |
110 | static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
111 | { | |
112 | return queue_var_show(q->limits.max_integrity_segments, (page)); | |
113 | } | |
114 | ||
c77a5710 MP |
115 | static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
116 | { | |
e692cb66 | 117 | if (blk_queue_cluster(q)) |
c77a5710 MP |
118 | return queue_var_show(queue_max_segment_size(q), (page)); |
119 | ||
120 | return queue_var_show(PAGE_CACHE_SIZE, (page)); | |
121 | } | |
122 | ||
e1defc4f | 123 | static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
e68b903c | 124 | { |
e1defc4f | 125 | return queue_var_show(queue_logical_block_size(q), page); |
e68b903c MP |
126 | } |
127 | ||
c72758f3 MP |
128 | static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
129 | { | |
130 | return queue_var_show(queue_physical_block_size(q), page); | |
131 | } | |
132 | ||
133 | static ssize_t queue_io_min_show(struct request_queue *q, char *page) | |
134 | { | |
135 | return queue_var_show(queue_io_min(q), page); | |
136 | } | |
137 | ||
138 | static ssize_t queue_io_opt_show(struct request_queue *q, char *page) | |
139 | { | |
140 | return queue_var_show(queue_io_opt(q), page); | |
e68b903c MP |
141 | } |
142 | ||
86b37281 MP |
143 | static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
144 | { | |
145 | return queue_var_show(q->limits.discard_granularity, page); | |
146 | } | |
147 | ||
0034af03 JA |
148 | static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
149 | { | |
150 | unsigned long long val; | |
151 | ||
152 | val = q->limits.max_hw_discard_sectors << 9; | |
153 | return sprintf(page, "%llu\n", val); | |
154 | } | |
155 | ||
86b37281 MP |
156 | static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
157 | { | |
a934a00a MP |
158 | return sprintf(page, "%llu\n", |
159 | (unsigned long long)q->limits.max_discard_sectors << 9); | |
86b37281 MP |
160 | } |
161 | ||
0034af03 JA |
162 | static ssize_t queue_discard_max_store(struct request_queue *q, |
163 | const char *page, size_t count) | |
164 | { | |
165 | unsigned long max_discard; | |
166 | ssize_t ret = queue_var_store(&max_discard, page, count); | |
167 | ||
168 | if (ret < 0) | |
169 | return ret; | |
170 | ||
171 | if (max_discard & (q->limits.discard_granularity - 1)) | |
172 | return -EINVAL; | |
173 | ||
174 | max_discard >>= 9; | |
175 | if (max_discard > UINT_MAX) | |
176 | return -EINVAL; | |
177 | ||
178 | if (max_discard > q->limits.max_hw_discard_sectors) | |
179 | max_discard = q->limits.max_hw_discard_sectors; | |
180 | ||
181 | q->limits.max_discard_sectors = max_discard; | |
182 | return ret; | |
183 | } | |
184 | ||
98262f27 MP |
185 | static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
186 | { | |
187 | return queue_var_show(queue_discard_zeroes_data(q), page); | |
188 | } | |
189 | ||
4363ac7c MP |
190 | static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
191 | { | |
192 | return sprintf(page, "%llu\n", | |
193 | (unsigned long long)q->limits.max_write_same_sectors << 9); | |
194 | } | |
195 | ||
196 | ||
8324aa91 JA |
197 | static ssize_t |
198 | queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) | |
199 | { | |
200 | unsigned long max_sectors_kb, | |
ae03bf63 | 201 | max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
8324aa91 JA |
202 | page_kb = 1 << (PAGE_CACHE_SHIFT - 10); |
203 | ssize_t ret = queue_var_store(&max_sectors_kb, page, count); | |
204 | ||
b1f3b64d DR |
205 | if (ret < 0) |
206 | return ret; | |
207 | ||
ca369d51 MP |
208 | max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
209 | q->limits.max_dev_sectors >> 1); | |
210 | ||
8324aa91 JA |
211 | if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
212 | return -EINVAL; | |
7c239517 | 213 | |
8324aa91 | 214 | spin_lock_irq(q->queue_lock); |
c295fc05 | 215 | q->limits.max_sectors = max_sectors_kb << 1; |
8324aa91 JA |
216 | spin_unlock_irq(q->queue_lock); |
217 | ||
218 | return ret; | |
219 | } | |
220 | ||
221 | static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) | |
222 | { | |
ae03bf63 | 223 | int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
8324aa91 JA |
224 | |
225 | return queue_var_show(max_hw_sectors_kb, (page)); | |
226 | } | |
227 | ||
956bcb7c JA |
228 | #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
229 | static ssize_t \ | |
230 | queue_show_##name(struct request_queue *q, char *page) \ | |
231 | { \ | |
232 | int bit; \ | |
233 | bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ | |
234 | return queue_var_show(neg ? !bit : bit, page); \ | |
235 | } \ | |
236 | static ssize_t \ | |
237 | queue_store_##name(struct request_queue *q, const char *page, size_t count) \ | |
238 | { \ | |
239 | unsigned long val; \ | |
240 | ssize_t ret; \ | |
241 | ret = queue_var_store(&val, page, count); \ | |
c678ef52 AB |
242 | if (ret < 0) \ |
243 | return ret; \ | |
956bcb7c JA |
244 | if (neg) \ |
245 | val = !val; \ | |
246 | \ | |
247 | spin_lock_irq(q->queue_lock); \ | |
248 | if (val) \ | |
249 | queue_flag_set(QUEUE_FLAG_##flag, q); \ | |
250 | else \ | |
251 | queue_flag_clear(QUEUE_FLAG_##flag, q); \ | |
252 | spin_unlock_irq(q->queue_lock); \ | |
253 | return ret; \ | |
1308835f BZ |
254 | } |
255 | ||
956bcb7c JA |
256 | QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
257 | QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); | |
258 | QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); | |
259 | #undef QUEUE_SYSFS_BIT_FNS | |
1308835f | 260 | |
ac9fafa1 AB |
261 | static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
262 | { | |
488991e2 AB |
263 | return queue_var_show((blk_queue_nomerges(q) << 1) | |
264 | blk_queue_noxmerges(q), page); | |
ac9fafa1 AB |
265 | } |
266 | ||
267 | static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, | |
268 | size_t count) | |
269 | { | |
270 | unsigned long nm; | |
271 | ssize_t ret = queue_var_store(&nm, page, count); | |
272 | ||
b1f3b64d DR |
273 | if (ret < 0) |
274 | return ret; | |
275 | ||
bf0f9702 | 276 | spin_lock_irq(q->queue_lock); |
488991e2 AB |
277 | queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
278 | queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); | |
279 | if (nm == 2) | |
bf0f9702 | 280 | queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
488991e2 AB |
281 | else if (nm) |
282 | queue_flag_set(QUEUE_FLAG_NOXMERGES, q); | |
bf0f9702 | 283 | spin_unlock_irq(q->queue_lock); |
1308835f | 284 | |
ac9fafa1 AB |
285 | return ret; |
286 | } | |
287 | ||
c7c22e4d JA |
288 | static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
289 | { | |
9cb308ce | 290 | bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
5757a6d7 | 291 | bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
c7c22e4d | 292 | |
5757a6d7 | 293 | return queue_var_show(set << force, page); |
c7c22e4d JA |
294 | } |
295 | ||
296 | static ssize_t | |
297 | queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) | |
298 | { | |
299 | ssize_t ret = -EINVAL; | |
0a06ff06 | 300 | #ifdef CONFIG_SMP |
c7c22e4d JA |
301 | unsigned long val; |
302 | ||
303 | ret = queue_var_store(&val, page, count); | |
b1f3b64d DR |
304 | if (ret < 0) |
305 | return ret; | |
306 | ||
c7c22e4d | 307 | spin_lock_irq(q->queue_lock); |
e8037d49 | 308 | if (val == 2) { |
c7c22e4d | 309 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
e8037d49 ES |
310 | queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
311 | } else if (val == 1) { | |
312 | queue_flag_set(QUEUE_FLAG_SAME_COMP, q); | |
313 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
314 | } else if (val == 0) { | |
5757a6d7 DW |
315 | queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
316 | queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); | |
317 | } | |
c7c22e4d JA |
318 | spin_unlock_irq(q->queue_lock); |
319 | #endif | |
320 | return ret; | |
321 | } | |
8324aa91 JA |
322 | |
323 | static struct queue_sysfs_entry queue_requests_entry = { | |
324 | .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, | |
325 | .show = queue_requests_show, | |
326 | .store = queue_requests_store, | |
327 | }; | |
328 | ||
329 | static struct queue_sysfs_entry queue_ra_entry = { | |
330 | .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, | |
331 | .show = queue_ra_show, | |
332 | .store = queue_ra_store, | |
333 | }; | |
334 | ||
335 | static struct queue_sysfs_entry queue_max_sectors_entry = { | |
336 | .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, | |
337 | .show = queue_max_sectors_show, | |
338 | .store = queue_max_sectors_store, | |
339 | }; | |
340 | ||
341 | static struct queue_sysfs_entry queue_max_hw_sectors_entry = { | |
342 | .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO }, | |
343 | .show = queue_max_hw_sectors_show, | |
344 | }; | |
345 | ||
c77a5710 MP |
346 | static struct queue_sysfs_entry queue_max_segments_entry = { |
347 | .attr = {.name = "max_segments", .mode = S_IRUGO }, | |
348 | .show = queue_max_segments_show, | |
349 | }; | |
350 | ||
13f05c8d MP |
351 | static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
352 | .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, | |
353 | .show = queue_max_integrity_segments_show, | |
354 | }; | |
355 | ||
c77a5710 MP |
356 | static struct queue_sysfs_entry queue_max_segment_size_entry = { |
357 | .attr = {.name = "max_segment_size", .mode = S_IRUGO }, | |
358 | .show = queue_max_segment_size_show, | |
359 | }; | |
360 | ||
8324aa91 JA |
361 | static struct queue_sysfs_entry queue_iosched_entry = { |
362 | .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, | |
363 | .show = elv_iosched_show, | |
364 | .store = elv_iosched_store, | |
365 | }; | |
366 | ||
e68b903c MP |
367 | static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
368 | .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, | |
e1defc4f MP |
369 | .show = queue_logical_block_size_show, |
370 | }; | |
371 | ||
372 | static struct queue_sysfs_entry queue_logical_block_size_entry = { | |
373 | .attr = {.name = "logical_block_size", .mode = S_IRUGO }, | |
374 | .show = queue_logical_block_size_show, | |
e68b903c MP |
375 | }; |
376 | ||
c72758f3 MP |
377 | static struct queue_sysfs_entry queue_physical_block_size_entry = { |
378 | .attr = {.name = "physical_block_size", .mode = S_IRUGO }, | |
379 | .show = queue_physical_block_size_show, | |
380 | }; | |
381 | ||
382 | static struct queue_sysfs_entry queue_io_min_entry = { | |
383 | .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, | |
384 | .show = queue_io_min_show, | |
385 | }; | |
386 | ||
387 | static struct queue_sysfs_entry queue_io_opt_entry = { | |
388 | .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, | |
389 | .show = queue_io_opt_show, | |
e68b903c MP |
390 | }; |
391 | ||
86b37281 MP |
392 | static struct queue_sysfs_entry queue_discard_granularity_entry = { |
393 | .attr = {.name = "discard_granularity", .mode = S_IRUGO }, | |
394 | .show = queue_discard_granularity_show, | |
395 | }; | |
396 | ||
0034af03 JA |
397 | static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
398 | .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, | |
399 | .show = queue_discard_max_hw_show, | |
400 | }; | |
401 | ||
86b37281 | 402 | static struct queue_sysfs_entry queue_discard_max_entry = { |
0034af03 | 403 | .attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
86b37281 | 404 | .show = queue_discard_max_show, |
0034af03 | 405 | .store = queue_discard_max_store, |
86b37281 MP |
406 | }; |
407 | ||
98262f27 MP |
408 | static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
409 | .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, | |
410 | .show = queue_discard_zeroes_data_show, | |
411 | }; | |
412 | ||
4363ac7c MP |
413 | static struct queue_sysfs_entry queue_write_same_max_entry = { |
414 | .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, | |
415 | .show = queue_write_same_max_show, | |
416 | }; | |
417 | ||
1308835f BZ |
418 | static struct queue_sysfs_entry queue_nonrot_entry = { |
419 | .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
420 | .show = queue_show_nonrot, |
421 | .store = queue_store_nonrot, | |
1308835f BZ |
422 | }; |
423 | ||
ac9fafa1 AB |
424 | static struct queue_sysfs_entry queue_nomerges_entry = { |
425 | .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, | |
426 | .show = queue_nomerges_show, | |
427 | .store = queue_nomerges_store, | |
428 | }; | |
429 | ||
c7c22e4d JA |
430 | static struct queue_sysfs_entry queue_rq_affinity_entry = { |
431 | .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, | |
432 | .show = queue_rq_affinity_show, | |
433 | .store = queue_rq_affinity_store, | |
434 | }; | |
435 | ||
bc58ba94 JA |
436 | static struct queue_sysfs_entry queue_iostats_entry = { |
437 | .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
438 | .show = queue_show_iostats, |
439 | .store = queue_store_iostats, | |
bc58ba94 JA |
440 | }; |
441 | ||
e2e1a148 JA |
442 | static struct queue_sysfs_entry queue_random_entry = { |
443 | .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, | |
956bcb7c JA |
444 | .show = queue_show_random, |
445 | .store = queue_store_random, | |
e2e1a148 JA |
446 | }; |
447 | ||
8324aa91 JA |
448 | static struct attribute *default_attrs[] = { |
449 | &queue_requests_entry.attr, | |
450 | &queue_ra_entry.attr, | |
451 | &queue_max_hw_sectors_entry.attr, | |
452 | &queue_max_sectors_entry.attr, | |
c77a5710 | 453 | &queue_max_segments_entry.attr, |
13f05c8d | 454 | &queue_max_integrity_segments_entry.attr, |
c77a5710 | 455 | &queue_max_segment_size_entry.attr, |
8324aa91 | 456 | &queue_iosched_entry.attr, |
e68b903c | 457 | &queue_hw_sector_size_entry.attr, |
e1defc4f | 458 | &queue_logical_block_size_entry.attr, |
c72758f3 MP |
459 | &queue_physical_block_size_entry.attr, |
460 | &queue_io_min_entry.attr, | |
461 | &queue_io_opt_entry.attr, | |
86b37281 MP |
462 | &queue_discard_granularity_entry.attr, |
463 | &queue_discard_max_entry.attr, | |
0034af03 | 464 | &queue_discard_max_hw_entry.attr, |
98262f27 | 465 | &queue_discard_zeroes_data_entry.attr, |
4363ac7c | 466 | &queue_write_same_max_entry.attr, |
1308835f | 467 | &queue_nonrot_entry.attr, |
ac9fafa1 | 468 | &queue_nomerges_entry.attr, |
c7c22e4d | 469 | &queue_rq_affinity_entry.attr, |
bc58ba94 | 470 | &queue_iostats_entry.attr, |
e2e1a148 | 471 | &queue_random_entry.attr, |
8324aa91 JA |
472 | NULL, |
473 | }; | |
474 | ||
475 | #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) | |
476 | ||
477 | static ssize_t | |
478 | queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
479 | { | |
480 | struct queue_sysfs_entry *entry = to_queue(attr); | |
481 | struct request_queue *q = | |
482 | container_of(kobj, struct request_queue, kobj); | |
483 | ssize_t res; | |
484 | ||
485 | if (!entry->show) | |
486 | return -EIO; | |
487 | mutex_lock(&q->sysfs_lock); | |
3f3299d5 | 488 | if (blk_queue_dying(q)) { |
8324aa91 JA |
489 | mutex_unlock(&q->sysfs_lock); |
490 | return -ENOENT; | |
491 | } | |
492 | res = entry->show(q, page); | |
493 | mutex_unlock(&q->sysfs_lock); | |
494 | return res; | |
495 | } | |
496 | ||
497 | static ssize_t | |
498 | queue_attr_store(struct kobject *kobj, struct attribute *attr, | |
499 | const char *page, size_t length) | |
500 | { | |
501 | struct queue_sysfs_entry *entry = to_queue(attr); | |
6728cb0e | 502 | struct request_queue *q; |
8324aa91 JA |
503 | ssize_t res; |
504 | ||
505 | if (!entry->store) | |
506 | return -EIO; | |
6728cb0e JA |
507 | |
508 | q = container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 509 | mutex_lock(&q->sysfs_lock); |
3f3299d5 | 510 | if (blk_queue_dying(q)) { |
8324aa91 JA |
511 | mutex_unlock(&q->sysfs_lock); |
512 | return -ENOENT; | |
513 | } | |
514 | res = entry->store(q, page, length); | |
515 | mutex_unlock(&q->sysfs_lock); | |
516 | return res; | |
517 | } | |
518 | ||
548bc8e1 TH |
519 | static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
520 | { | |
521 | struct request_queue *q = container_of(rcu_head, struct request_queue, | |
522 | rcu_head); | |
523 | kmem_cache_free(blk_requestq_cachep, q); | |
524 | } | |
525 | ||
8324aa91 | 526 | /** |
499337bb AM |
527 | * blk_release_queue: - release a &struct request_queue when it is no longer needed |
528 | * @kobj: the kobj belonging to the request queue to be released | |
8324aa91 JA |
529 | * |
530 | * Description: | |
499337bb | 531 | * blk_release_queue is the pair to blk_init_queue() or |
8324aa91 JA |
532 | * blk_queue_make_request(). It should be called when a request queue is |
533 | * being released; typically when a block device is being de-registered. | |
534 | * Currently, its primary task it to free all the &struct request | |
535 | * structures that were allocated to the queue and the queue itself. | |
536 | * | |
45a9c9d9 BVA |
537 | * Note: |
538 | * The low level driver must have finished any outstanding requests first | |
539 | * via blk_cleanup_queue(). | |
8324aa91 JA |
540 | **/ |
541 | static void blk_release_queue(struct kobject *kobj) | |
542 | { | |
543 | struct request_queue *q = | |
544 | container_of(kobj, struct request_queue, kobj); | |
8324aa91 | 545 | |
e8989fae TH |
546 | blkcg_exit_queue(q); |
547 | ||
7e5a8794 TH |
548 | if (q->elevator) { |
549 | spin_lock_irq(q->queue_lock); | |
550 | ioc_clear_queue(q); | |
551 | spin_unlock_irq(q->queue_lock); | |
777eb1bf | 552 | elevator_exit(q->elevator); |
7e5a8794 | 553 | } |
777eb1bf | 554 | |
a051661c | 555 | blk_exit_rl(&q->root_rl); |
8324aa91 JA |
556 | |
557 | if (q->queue_tags) | |
558 | __blk_queue_free_tags(q); | |
559 | ||
45a9c9d9 | 560 | if (!q->mq_ops) |
f70ced09 | 561 | blk_free_flush_queue(q->fq); |
e09aae7e ML |
562 | else |
563 | blk_mq_release(q); | |
18741986 | 564 | |
8324aa91 JA |
565 | blk_trace_shutdown(q); |
566 | ||
54efd50b KO |
567 | if (q->bio_split) |
568 | bioset_free(q->bio_split); | |
569 | ||
a73f730d | 570 | ida_simple_remove(&blk_queue_ida, q->id); |
548bc8e1 | 571 | call_rcu(&q->rcu_head, blk_free_queue_rcu); |
8324aa91 JA |
572 | } |
573 | ||
52cf25d0 | 574 | static const struct sysfs_ops queue_sysfs_ops = { |
8324aa91 JA |
575 | .show = queue_attr_show, |
576 | .store = queue_attr_store, | |
577 | }; | |
578 | ||
579 | struct kobj_type blk_queue_ktype = { | |
580 | .sysfs_ops = &queue_sysfs_ops, | |
581 | .default_attrs = default_attrs, | |
582 | .release = blk_release_queue, | |
583 | }; | |
584 | ||
585 | int blk_register_queue(struct gendisk *disk) | |
586 | { | |
587 | int ret; | |
1d54ad6d | 588 | struct device *dev = disk_to_dev(disk); |
8324aa91 JA |
589 | struct request_queue *q = disk->queue; |
590 | ||
fb199746 | 591 | if (WARN_ON(!q)) |
8324aa91 JA |
592 | return -ENXIO; |
593 | ||
749fefe6 | 594 | /* |
17497acb TH |
595 | * SCSI probing may synchronously create and destroy a lot of |
596 | * request_queues for non-existent devices. Shutting down a fully | |
597 | * functional queue takes measureable wallclock time as RCU grace | |
598 | * periods are involved. To avoid excessive latency in these | |
599 | * cases, a request_queue starts out in a degraded mode which is | |
600 | * faster to shut down and is made fully functional here as | |
601 | * request_queues for non-existent devices never get registered. | |
749fefe6 | 602 | */ |
df35c7c9 AS |
603 | if (!blk_queue_init_done(q)) { |
604 | queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); | |
605 | blk_queue_bypass_end(q); | |
17497acb TH |
606 | if (q->mq_ops) |
607 | blk_mq_finish_init(q); | |
df35c7c9 | 608 | } |
749fefe6 | 609 | |
1d54ad6d LZ |
610 | ret = blk_trace_init_sysfs(dev); |
611 | if (ret) | |
612 | return ret; | |
613 | ||
c9059598 | 614 | ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
ed5302d3 LY |
615 | if (ret < 0) { |
616 | blk_trace_remove_sysfs(dev); | |
8324aa91 | 617 | return ret; |
ed5302d3 | 618 | } |
8324aa91 JA |
619 | |
620 | kobject_uevent(&q->kobj, KOBJ_ADD); | |
621 | ||
320ae51f JA |
622 | if (q->mq_ops) |
623 | blk_mq_register_disk(disk); | |
624 | ||
cd43e26f MP |
625 | if (!q->request_fn) |
626 | return 0; | |
627 | ||
8324aa91 JA |
628 | ret = elv_register_queue(q); |
629 | if (ret) { | |
630 | kobject_uevent(&q->kobj, KOBJ_REMOVE); | |
631 | kobject_del(&q->kobj); | |
80656b67 | 632 | blk_trace_remove_sysfs(dev); |
c87ffbb8 | 633 | kobject_put(&dev->kobj); |
8324aa91 JA |
634 | return ret; |
635 | } | |
636 | ||
637 | return 0; | |
638 | } | |
639 | ||
640 | void blk_unregister_queue(struct gendisk *disk) | |
641 | { | |
642 | struct request_queue *q = disk->queue; | |
643 | ||
fb199746 AM |
644 | if (WARN_ON(!q)) |
645 | return; | |
646 | ||
320ae51f JA |
647 | if (q->mq_ops) |
648 | blk_mq_unregister_disk(disk); | |
649 | ||
48c0d4d4 | 650 | if (q->request_fn) |
8324aa91 JA |
651 | elv_unregister_queue(q); |
652 | ||
48c0d4d4 ZK |
653 | kobject_uevent(&q->kobj, KOBJ_REMOVE); |
654 | kobject_del(&q->kobj); | |
655 | blk_trace_remove_sysfs(disk_to_dev(disk)); | |
656 | kobject_put(&disk_to_dev(disk)->kobj); | |
8324aa91 | 657 | } |