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Jens Axboe8324aa92008-01-29 14:51:59 +01001/*
2 * Functions related to sysfs handling
3 */
4#include <linux/kernel.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09005#include <linux/slab.h>
Jens Axboe8324aa92008-01-29 14:51:59 +01006#include <linux/module.h>
7#include <linux/bio.h>
8#include <linux/blkdev.h>
9#include <linux/blktrace_api.h>
10
11#include "blk.h"
Tejun Heo5efd6112012-03-05 13:15:12 -080012#include "blk-cgroup.h"
Jens Axboe8324aa92008-01-29 14:51:59 +010013
14struct queue_sysfs_entry {
15 struct attribute attr;
16 ssize_t (*show)(struct request_queue *, char *);
17 ssize_t (*store)(struct request_queue *, const char *, size_t);
18};
19
20static ssize_t
Xiaotian Feng9cb308c2009-07-17 15:26:26 +080021queue_var_show(unsigned long var, char *page)
Jens Axboe8324aa92008-01-29 14:51:59 +010022{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +080023 return sprintf(page, "%lu\n", var);
Jens Axboe8324aa92008-01-29 14:51:59 +010024}
25
26static ssize_t
27queue_var_store(unsigned long *var, const char *page, size_t count)
28{
Dave Reisnerb1f3b642012-09-08 11:55:45 -040029 int err;
30 unsigned long v;
Jens Axboe8324aa92008-01-29 14:51:59 +010031
Dave Reisnerb1f3b642012-09-08 11:55:45 -040032 err = strict_strtoul(page, 10, &v);
33 if (err || v > UINT_MAX)
34 return -EINVAL;
35
36 *var = v;
37
Jens Axboe8324aa92008-01-29 14:51:59 +010038 return count;
39}
40
41static ssize_t queue_requests_show(struct request_queue *q, char *page)
42{
43 return queue_var_show(q->nr_requests, (page));
44}
45
46static ssize_t
47queue_requests_store(struct request_queue *q, const char *page, size_t count)
48{
Tejun Heoa0516612012-06-26 15:05:44 -070049 struct request_list *rl;
Jens Axboe8324aa92008-01-29 14:51:59 +010050 unsigned long nr;
Jens Axboeb8a9ae72009-09-11 22:44:29 +020051 int ret;
52
53 if (!q->request_fn)
54 return -EINVAL;
55
56 ret = queue_var_store(&nr, page, count);
Dave Reisnerb1f3b642012-09-08 11:55:45 -040057 if (ret < 0)
58 return ret;
59
Jens Axboe8324aa92008-01-29 14:51:59 +010060 if (nr < BLKDEV_MIN_RQ)
61 nr = BLKDEV_MIN_RQ;
62
63 spin_lock_irq(q->queue_lock);
64 q->nr_requests = nr;
65 blk_queue_congestion_threshold(q);
66
Tejun Heoa0516612012-06-26 15:05:44 -070067 /* congestion isn't cgroup aware and follows root blkcg for now */
68 rl = &q->root_rl;
69
Jens Axboe1faa16d2009-04-06 14:48:01 +020070 if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
71 blk_set_queue_congested(q, BLK_RW_SYNC);
72 else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
73 blk_clear_queue_congested(q, BLK_RW_SYNC);
Jens Axboe8324aa92008-01-29 14:51:59 +010074
Jens Axboe1faa16d2009-04-06 14:48:01 +020075 if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
76 blk_set_queue_congested(q, BLK_RW_ASYNC);
77 else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
78 blk_clear_queue_congested(q, BLK_RW_ASYNC);
Jens Axboe8324aa92008-01-29 14:51:59 +010079
Tejun Heoa0516612012-06-26 15:05:44 -070080 blk_queue_for_each_rl(rl, q) {
81 if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
82 blk_set_rl_full(rl, BLK_RW_SYNC);
83 } else {
84 blk_clear_rl_full(rl, BLK_RW_SYNC);
85 wake_up(&rl->wait[BLK_RW_SYNC]);
86 }
87
88 if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
89 blk_set_rl_full(rl, BLK_RW_ASYNC);
90 } else {
91 blk_clear_rl_full(rl, BLK_RW_ASYNC);
92 wake_up(&rl->wait[BLK_RW_ASYNC]);
93 }
Jens Axboe8324aa92008-01-29 14:51:59 +010094 }
95
Jens Axboe8324aa92008-01-29 14:51:59 +010096 spin_unlock_irq(q->queue_lock);
97 return ret;
98}
99
100static ssize_t queue_ra_show(struct request_queue *q, char *page)
101{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +0800102 unsigned long ra_kb = q->backing_dev_info.ra_pages <<
103 (PAGE_CACHE_SHIFT - 10);
Jens Axboe8324aa92008-01-29 14:51:59 +0100104
105 return queue_var_show(ra_kb, (page));
106}
107
108static ssize_t
109queue_ra_store(struct request_queue *q, const char *page, size_t count)
110{
111 unsigned long ra_kb;
112 ssize_t ret = queue_var_store(&ra_kb, page, count);
113
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400114 if (ret < 0)
115 return ret;
116
Jens Axboe8324aa92008-01-29 14:51:59 +0100117 q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
Jens Axboe8324aa92008-01-29 14:51:59 +0100118
119 return ret;
120}
121
122static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
123{
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400124 int max_sectors_kb = queue_max_sectors(q) >> 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100125
126 return queue_var_show(max_sectors_kb, (page));
127}
128
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500129static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
130{
131 return queue_var_show(queue_max_segments(q), (page));
132}
133
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200134static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
135{
136 return queue_var_show(q->limits.max_integrity_segments, (page));
137}
138
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500139static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
140{
Martin K. Petersene692cb62010-12-01 19:41:49 +0100141 if (blk_queue_cluster(q))
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500142 return queue_var_show(queue_max_segment_size(q), (page));
143
144 return queue_var_show(PAGE_CACHE_SIZE, (page));
145}
146
Martin K. Petersene1defc42009-05-22 17:17:49 -0400147static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
Martin K. Petersene68b9032008-01-29 19:14:08 +0100148{
Martin K. Petersene1defc42009-05-22 17:17:49 -0400149 return queue_var_show(queue_logical_block_size(q), page);
Martin K. Petersene68b9032008-01-29 19:14:08 +0100150}
151
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400152static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
153{
154 return queue_var_show(queue_physical_block_size(q), page);
155}
156
157static ssize_t queue_io_min_show(struct request_queue *q, char *page)
158{
159 return queue_var_show(queue_io_min(q), page);
160}
161
162static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
163{
164 return queue_var_show(queue_io_opt(q), page);
Jens Axboe8324aa92008-01-29 14:51:59 +0100165}
166
Martin K. Petersen86b37282009-11-10 11:50:21 +0100167static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page)
168{
169 return queue_var_show(q->limits.discard_granularity, page);
170}
171
172static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
173{
Martin K. Petersena934a002011-05-18 10:37:35 +0200174 return sprintf(page, "%llu\n",
175 (unsigned long long)q->limits.max_discard_sectors << 9);
Martin K. Petersen86b37282009-11-10 11:50:21 +0100176}
177
Martin K. Petersen98262f22009-12-03 09:24:48 +0100178static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
179{
180 return queue_var_show(queue_discard_zeroes_data(q), page);
181}
182
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400183static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
184{
185 return sprintf(page, "%llu\n",
186 (unsigned long long)q->limits.max_write_same_sectors << 9);
187}
188
189
Jens Axboe8324aa92008-01-29 14:51:59 +0100190static ssize_t
191queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
192{
193 unsigned long max_sectors_kb,
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400194 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
Jens Axboe8324aa92008-01-29 14:51:59 +0100195 page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
196 ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
197
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400198 if (ret < 0)
199 return ret;
200
Jens Axboe8324aa92008-01-29 14:51:59 +0100201 if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
202 return -EINVAL;
Wu Fengguang7c239512008-11-25 09:08:39 +0100203
Jens Axboe8324aa92008-01-29 14:51:59 +0100204 spin_lock_irq(q->queue_lock);
Nikanth Karthikesanc295fc02009-09-01 22:40:15 +0200205 q->limits.max_sectors = max_sectors_kb << 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100206 spin_unlock_irq(q->queue_lock);
207
208 return ret;
209}
210
211static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
212{
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400213 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100214
215 return queue_var_show(max_hw_sectors_kb, (page));
216}
217
Jens Axboe956bcb72010-08-07 18:13:50 +0200218#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
219static ssize_t \
220queue_show_##name(struct request_queue *q, char *page) \
221{ \
222 int bit; \
223 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
224 return queue_var_show(neg ? !bit : bit, page); \
225} \
226static ssize_t \
227queue_store_##name(struct request_queue *q, const char *page, size_t count) \
228{ \
229 unsigned long val; \
230 ssize_t ret; \
231 ret = queue_var_store(&val, page, count); \
Arnd Bergmannc678ef52013-04-03 21:53:57 +0200232 if (ret < 0) \
233 return ret; \
Jens Axboe956bcb72010-08-07 18:13:50 +0200234 if (neg) \
235 val = !val; \
236 \
237 spin_lock_irq(q->queue_lock); \
238 if (val) \
239 queue_flag_set(QUEUE_FLAG_##flag, q); \
240 else \
241 queue_flag_clear(QUEUE_FLAG_##flag, q); \
242 spin_unlock_irq(q->queue_lock); \
243 return ret; \
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100244}
245
Jens Axboe956bcb72010-08-07 18:13:50 +0200246QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
247QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
248QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
249#undef QUEUE_SYSFS_BIT_FNS
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100250
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200251static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
252{
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100253 return queue_var_show((blk_queue_nomerges(q) << 1) |
254 blk_queue_noxmerges(q), page);
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200255}
256
257static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
258 size_t count)
259{
260 unsigned long nm;
261 ssize_t ret = queue_var_store(&nm, page, count);
262
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400263 if (ret < 0)
264 return ret;
265
Jens Axboebf0f9702008-05-07 09:09:39 +0200266 spin_lock_irq(q->queue_lock);
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100267 queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
268 queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
269 if (nm == 2)
Jens Axboebf0f9702008-05-07 09:09:39 +0200270 queue_flag_set(QUEUE_FLAG_NOMERGES, q);
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100271 else if (nm)
272 queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
Jens Axboebf0f9702008-05-07 09:09:39 +0200273 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100274
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200275 return ret;
276}
277
Jens Axboec7c22e42008-09-13 20:26:01 +0200278static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
279{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +0800280 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
Dan Williams5757a6d2011-07-23 20:44:25 +0200281 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
Jens Axboec7c22e42008-09-13 20:26:01 +0200282
Dan Williams5757a6d2011-07-23 20:44:25 +0200283 return queue_var_show(set << force, page);
Jens Axboec7c22e42008-09-13 20:26:01 +0200284}
285
286static ssize_t
287queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
288{
289 ssize_t ret = -EINVAL;
290#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
291 unsigned long val;
292
293 ret = queue_var_store(&val, page, count);
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400294 if (ret < 0)
295 return ret;
296
Jens Axboec7c22e42008-09-13 20:26:01 +0200297 spin_lock_irq(q->queue_lock);
Eric Seppanene8037d42011-08-23 21:25:12 +0200298 if (val == 2) {
Jens Axboec7c22e42008-09-13 20:26:01 +0200299 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
Eric Seppanene8037d42011-08-23 21:25:12 +0200300 queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
301 } else if (val == 1) {
302 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
303 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
304 } else if (val == 0) {
Dan Williams5757a6d2011-07-23 20:44:25 +0200305 queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
306 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
307 }
Jens Axboec7c22e42008-09-13 20:26:01 +0200308 spin_unlock_irq(q->queue_lock);
309#endif
310 return ret;
311}
Jens Axboe8324aa92008-01-29 14:51:59 +0100312
313static struct queue_sysfs_entry queue_requests_entry = {
314 .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
315 .show = queue_requests_show,
316 .store = queue_requests_store,
317};
318
319static struct queue_sysfs_entry queue_ra_entry = {
320 .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
321 .show = queue_ra_show,
322 .store = queue_ra_store,
323};
324
325static struct queue_sysfs_entry queue_max_sectors_entry = {
326 .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
327 .show = queue_max_sectors_show,
328 .store = queue_max_sectors_store,
329};
330
331static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
332 .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
333 .show = queue_max_hw_sectors_show,
334};
335
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500336static struct queue_sysfs_entry queue_max_segments_entry = {
337 .attr = {.name = "max_segments", .mode = S_IRUGO },
338 .show = queue_max_segments_show,
339};
340
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200341static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
342 .attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
343 .show = queue_max_integrity_segments_show,
344};
345
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500346static struct queue_sysfs_entry queue_max_segment_size_entry = {
347 .attr = {.name = "max_segment_size", .mode = S_IRUGO },
348 .show = queue_max_segment_size_show,
349};
350
Jens Axboe8324aa92008-01-29 14:51:59 +0100351static struct queue_sysfs_entry queue_iosched_entry = {
352 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
353 .show = elv_iosched_show,
354 .store = elv_iosched_store,
355};
356
Martin K. Petersene68b9032008-01-29 19:14:08 +0100357static struct queue_sysfs_entry queue_hw_sector_size_entry = {
358 .attr = {.name = "hw_sector_size", .mode = S_IRUGO },
Martin K. Petersene1defc42009-05-22 17:17:49 -0400359 .show = queue_logical_block_size_show,
360};
361
362static struct queue_sysfs_entry queue_logical_block_size_entry = {
363 .attr = {.name = "logical_block_size", .mode = S_IRUGO },
364 .show = queue_logical_block_size_show,
Martin K. Petersene68b9032008-01-29 19:14:08 +0100365};
366
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400367static struct queue_sysfs_entry queue_physical_block_size_entry = {
368 .attr = {.name = "physical_block_size", .mode = S_IRUGO },
369 .show = queue_physical_block_size_show,
370};
371
372static struct queue_sysfs_entry queue_io_min_entry = {
373 .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
374 .show = queue_io_min_show,
375};
376
377static struct queue_sysfs_entry queue_io_opt_entry = {
378 .attr = {.name = "optimal_io_size", .mode = S_IRUGO },
379 .show = queue_io_opt_show,
Jens Axboe8324aa92008-01-29 14:51:59 +0100380};
381
Martin K. Petersen86b37282009-11-10 11:50:21 +0100382static struct queue_sysfs_entry queue_discard_granularity_entry = {
383 .attr = {.name = "discard_granularity", .mode = S_IRUGO },
384 .show = queue_discard_granularity_show,
385};
386
387static struct queue_sysfs_entry queue_discard_max_entry = {
388 .attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
389 .show = queue_discard_max_show,
390};
391
Martin K. Petersen98262f22009-12-03 09:24:48 +0100392static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
393 .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
394 .show = queue_discard_zeroes_data_show,
395};
396
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400397static struct queue_sysfs_entry queue_write_same_max_entry = {
398 .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
399 .show = queue_write_same_max_show,
400};
401
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100402static struct queue_sysfs_entry queue_nonrot_entry = {
403 .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200404 .show = queue_show_nonrot,
405 .store = queue_store_nonrot,
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100406};
407
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200408static struct queue_sysfs_entry queue_nomerges_entry = {
409 .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
410 .show = queue_nomerges_show,
411 .store = queue_nomerges_store,
412};
413
Jens Axboec7c22e42008-09-13 20:26:01 +0200414static struct queue_sysfs_entry queue_rq_affinity_entry = {
415 .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
416 .show = queue_rq_affinity_show,
417 .store = queue_rq_affinity_store,
418};
419
Jens Axboebc58ba92009-01-23 10:54:44 +0100420static struct queue_sysfs_entry queue_iostats_entry = {
421 .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200422 .show = queue_show_iostats,
423 .store = queue_store_iostats,
Jens Axboebc58ba92009-01-23 10:54:44 +0100424};
425
Jens Axboee2e1a142010-06-09 10:42:09 +0200426static struct queue_sysfs_entry queue_random_entry = {
427 .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200428 .show = queue_show_random,
429 .store = queue_store_random,
Jens Axboee2e1a142010-06-09 10:42:09 +0200430};
431
Jens Axboe8324aa92008-01-29 14:51:59 +0100432static struct attribute *default_attrs[] = {
433 &queue_requests_entry.attr,
434 &queue_ra_entry.attr,
435 &queue_max_hw_sectors_entry.attr,
436 &queue_max_sectors_entry.attr,
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500437 &queue_max_segments_entry.attr,
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200438 &queue_max_integrity_segments_entry.attr,
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500439 &queue_max_segment_size_entry.attr,
Jens Axboe8324aa92008-01-29 14:51:59 +0100440 &queue_iosched_entry.attr,
Martin K. Petersene68b9032008-01-29 19:14:08 +0100441 &queue_hw_sector_size_entry.attr,
Martin K. Petersene1defc42009-05-22 17:17:49 -0400442 &queue_logical_block_size_entry.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400443 &queue_physical_block_size_entry.attr,
444 &queue_io_min_entry.attr,
445 &queue_io_opt_entry.attr,
Martin K. Petersen86b37282009-11-10 11:50:21 +0100446 &queue_discard_granularity_entry.attr,
447 &queue_discard_max_entry.attr,
Martin K. Petersen98262f22009-12-03 09:24:48 +0100448 &queue_discard_zeroes_data_entry.attr,
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400449 &queue_write_same_max_entry.attr,
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100450 &queue_nonrot_entry.attr,
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200451 &queue_nomerges_entry.attr,
Jens Axboec7c22e42008-09-13 20:26:01 +0200452 &queue_rq_affinity_entry.attr,
Jens Axboebc58ba92009-01-23 10:54:44 +0100453 &queue_iostats_entry.attr,
Jens Axboee2e1a142010-06-09 10:42:09 +0200454 &queue_random_entry.attr,
Jens Axboe8324aa92008-01-29 14:51:59 +0100455 NULL,
456};
457
458#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
459
460static ssize_t
461queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
462{
463 struct queue_sysfs_entry *entry = to_queue(attr);
464 struct request_queue *q =
465 container_of(kobj, struct request_queue, kobj);
466 ssize_t res;
467
468 if (!entry->show)
469 return -EIO;
470 mutex_lock(&q->sysfs_lock);
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100471 if (blk_queue_dying(q)) {
Jens Axboe8324aa92008-01-29 14:51:59 +0100472 mutex_unlock(&q->sysfs_lock);
473 return -ENOENT;
474 }
475 res = entry->show(q, page);
476 mutex_unlock(&q->sysfs_lock);
477 return res;
478}
479
480static ssize_t
481queue_attr_store(struct kobject *kobj, struct attribute *attr,
482 const char *page, size_t length)
483{
484 struct queue_sysfs_entry *entry = to_queue(attr);
Jens Axboe6728cb02008-01-31 13:03:55 +0100485 struct request_queue *q;
Jens Axboe8324aa92008-01-29 14:51:59 +0100486 ssize_t res;
487
488 if (!entry->store)
489 return -EIO;
Jens Axboe6728cb02008-01-31 13:03:55 +0100490
491 q = container_of(kobj, struct request_queue, kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100492 mutex_lock(&q->sysfs_lock);
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100493 if (blk_queue_dying(q)) {
Jens Axboe8324aa92008-01-29 14:51:59 +0100494 mutex_unlock(&q->sysfs_lock);
495 return -ENOENT;
496 }
497 res = entry->store(q, page, length);
498 mutex_unlock(&q->sysfs_lock);
499 return res;
500}
501
Tejun Heo548bc8e2013-01-09 08:05:13 -0800502static void blk_free_queue_rcu(struct rcu_head *rcu_head)
503{
504 struct request_queue *q = container_of(rcu_head, struct request_queue,
505 rcu_head);
506 kmem_cache_free(blk_requestq_cachep, q);
507}
508
Jens Axboe8324aa92008-01-29 14:51:59 +0100509/**
Andrew Morton499337b2011-09-21 10:01:22 +0200510 * blk_release_queue: - release a &struct request_queue when it is no longer needed
511 * @kobj: the kobj belonging to the request queue to be released
Jens Axboe8324aa92008-01-29 14:51:59 +0100512 *
513 * Description:
Andrew Morton499337b2011-09-21 10:01:22 +0200514 * blk_release_queue is the pair to blk_init_queue() or
Jens Axboe8324aa92008-01-29 14:51:59 +0100515 * blk_queue_make_request(). It should be called when a request queue is
516 * being released; typically when a block device is being de-registered.
517 * Currently, its primary task it to free all the &struct request
518 * structures that were allocated to the queue and the queue itself.
519 *
520 * Caveat:
521 * Hopefully the low level driver will have finished any
522 * outstanding requests first...
523 **/
524static void blk_release_queue(struct kobject *kobj)
525{
526 struct request_queue *q =
527 container_of(kobj, struct request_queue, kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100528
529 blk_sync_queue(q);
530
Tejun Heoe8989fa2012-03-05 13:15:20 -0800531 blkcg_exit_queue(q);
532
Tejun Heo7e5a8792011-12-14 00:33:42 +0100533 if (q->elevator) {
534 spin_lock_irq(q->queue_lock);
535 ioc_clear_queue(q);
536 spin_unlock_irq(q->queue_lock);
Hannes Reinecke777eb1b2011-09-28 08:07:01 -0600537 elevator_exit(q->elevator);
Tejun Heo7e5a8792011-12-14 00:33:42 +0100538 }
Hannes Reinecke777eb1b2011-09-28 08:07:01 -0600539
Tejun Heoa0516612012-06-26 15:05:44 -0700540 blk_exit_rl(&q->root_rl);
Jens Axboe8324aa92008-01-29 14:51:59 +0100541
542 if (q->queue_tags)
543 __blk_queue_free_tags(q);
544
545 blk_trace_shutdown(q);
546
547 bdi_destroy(&q->backing_dev_info);
Tejun Heoa73f7302011-12-14 00:33:37 +0100548
549 ida_simple_remove(&blk_queue_ida, q->id);
Tejun Heo548bc8e2013-01-09 08:05:13 -0800550 call_rcu(&q->rcu_head, blk_free_queue_rcu);
Jens Axboe8324aa92008-01-29 14:51:59 +0100551}
552
Emese Revfy52cf25d2010-01-19 02:58:23 +0100553static const struct sysfs_ops queue_sysfs_ops = {
Jens Axboe8324aa92008-01-29 14:51:59 +0100554 .show = queue_attr_show,
555 .store = queue_attr_store,
556};
557
558struct kobj_type blk_queue_ktype = {
559 .sysfs_ops = &queue_sysfs_ops,
560 .default_attrs = default_attrs,
561 .release = blk_release_queue,
562};
563
564int blk_register_queue(struct gendisk *disk)
565{
566 int ret;
Li Zefan1d54ad62009-04-14 14:00:05 +0800567 struct device *dev = disk_to_dev(disk);
Jens Axboe8324aa92008-01-29 14:51:59 +0100568 struct request_queue *q = disk->queue;
569
Akinobu Mitafb199742008-04-21 09:51:06 +0200570 if (WARN_ON(!q))
Jens Axboe8324aa92008-01-29 14:51:59 +0100571 return -ENXIO;
572
Tejun Heo749fefe2012-09-20 14:08:52 -0700573 /*
574 * Initialization must be complete by now. Finish the initial
575 * bypass from queue allocation.
576 */
577 blk_queue_bypass_end(q);
578
Li Zefan1d54ad62009-04-14 14:00:05 +0800579 ret = blk_trace_init_sysfs(dev);
580 if (ret)
581 return ret;
582
Linus Torvaldsc9059592009-06-11 10:52:27 -0700583 ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
Liu Yuaned5302d2011-04-19 13:47:58 +0200584 if (ret < 0) {
585 blk_trace_remove_sysfs(dev);
Jens Axboe8324aa92008-01-29 14:51:59 +0100586 return ret;
Liu Yuaned5302d2011-04-19 13:47:58 +0200587 }
Jens Axboe8324aa92008-01-29 14:51:59 +0100588
589 kobject_uevent(&q->kobj, KOBJ_ADD);
590
Martin K. Petersencd43e262009-05-22 17:17:52 -0400591 if (!q->request_fn)
592 return 0;
593
Jens Axboe8324aa92008-01-29 14:51:59 +0100594 ret = elv_register_queue(q);
595 if (ret) {
596 kobject_uevent(&q->kobj, KOBJ_REMOVE);
597 kobject_del(&q->kobj);
Liu Yuan80656b62011-04-13 22:14:54 +0200598 blk_trace_remove_sysfs(dev);
Xiaotian Fengc87ffbb2010-08-23 12:30:29 +0200599 kobject_put(&dev->kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100600 return ret;
601 }
602
603 return 0;
604}
605
606void blk_unregister_queue(struct gendisk *disk)
607{
608 struct request_queue *q = disk->queue;
609
Akinobu Mitafb199742008-04-21 09:51:06 +0200610 if (WARN_ON(!q))
611 return;
612
Zdenek Kabelac48c0d4d2009-09-25 06:19:26 +0200613 if (q->request_fn)
Jens Axboe8324aa92008-01-29 14:51:59 +0100614 elv_unregister_queue(q);
615
Zdenek Kabelac48c0d4d2009-09-25 06:19:26 +0200616 kobject_uevent(&q->kobj, KOBJ_REMOVE);
617 kobject_del(&q->kobj);
618 blk_trace_remove_sysfs(disk_to_dev(disk));
619 kobject_put(&disk_to_dev(disk)->kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100620}