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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>
Jens Axboe320ae512013-10-24 09:20:05 +010010#include <linux/blk-mq.h>
Jens Axboe8324aa92008-01-29 14:51:59 +010011
12#include "blk.h"
Tejun Heo5efd6112012-03-05 13:15:12 -080013#include "blk-cgroup.h"
Jens Axboe8324aa92008-01-29 14:51:59 +010014
15struct queue_sysfs_entry {
16 struct attribute attr;
17 ssize_t (*show)(struct request_queue *, char *);
18 ssize_t (*store)(struct request_queue *, const char *, size_t);
19};
20
21static ssize_t
Xiaotian Feng9cb308c2009-07-17 15:26:26 +080022queue_var_show(unsigned long var, char *page)
Jens Axboe8324aa92008-01-29 14:51:59 +010023{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +080024 return sprintf(page, "%lu\n", var);
Jens Axboe8324aa92008-01-29 14:51:59 +010025}
26
27static ssize_t
28queue_var_store(unsigned long *var, const char *page, size_t count)
29{
Dave Reisnerb1f3b642012-09-08 11:55:45 -040030 int err;
31 unsigned long v;
Jens Axboe8324aa92008-01-29 14:51:59 +010032
Jingoo Haned751e62013-09-11 14:20:08 -070033 err = kstrtoul(page, 10, &v);
Dave Reisnerb1f3b642012-09-08 11:55:45 -040034 if (err || v > UINT_MAX)
35 return -EINVAL;
36
37 *var = v;
38
Jens Axboe8324aa92008-01-29 14:51:59 +010039 return count;
40}
41
42static ssize_t queue_requests_show(struct request_queue *q, char *page)
43{
44 return queue_var_show(q->nr_requests, (page));
45}
46
47static ssize_t
48queue_requests_store(struct request_queue *q, const char *page, size_t count)
49{
Tejun Heoa0516612012-06-26 15:05:44 -070050 struct request_list *rl;
Jens Axboe8324aa92008-01-29 14:51:59 +010051 unsigned long nr;
Jens Axboeb8a9ae72009-09-11 22:44:29 +020052 int ret;
53
54 if (!q->request_fn)
55 return -EINVAL;
56
57 ret = queue_var_store(&nr, page, count);
Dave Reisnerb1f3b642012-09-08 11:55:45 -040058 if (ret < 0)
59 return ret;
60
Jens Axboe8324aa92008-01-29 14:51:59 +010061 if (nr < BLKDEV_MIN_RQ)
62 nr = BLKDEV_MIN_RQ;
63
64 spin_lock_irq(q->queue_lock);
65 q->nr_requests = nr;
66 blk_queue_congestion_threshold(q);
67
Tejun Heoa0516612012-06-26 15:05:44 -070068 /* congestion isn't cgroup aware and follows root blkcg for now */
69 rl = &q->root_rl;
70
Jens Axboe1faa16d2009-04-06 14:48:01 +020071 if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
72 blk_set_queue_congested(q, BLK_RW_SYNC);
73 else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
74 blk_clear_queue_congested(q, BLK_RW_SYNC);
Jens Axboe8324aa92008-01-29 14:51:59 +010075
Jens Axboe1faa16d2009-04-06 14:48:01 +020076 if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
77 blk_set_queue_congested(q, BLK_RW_ASYNC);
78 else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
79 blk_clear_queue_congested(q, BLK_RW_ASYNC);
Jens Axboe8324aa92008-01-29 14:51:59 +010080
Tejun Heoa0516612012-06-26 15:05:44 -070081 blk_queue_for_each_rl(rl, q) {
82 if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
83 blk_set_rl_full(rl, BLK_RW_SYNC);
84 } else {
85 blk_clear_rl_full(rl, BLK_RW_SYNC);
86 wake_up(&rl->wait[BLK_RW_SYNC]);
87 }
88
89 if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
90 blk_set_rl_full(rl, BLK_RW_ASYNC);
91 } else {
92 blk_clear_rl_full(rl, BLK_RW_ASYNC);
93 wake_up(&rl->wait[BLK_RW_ASYNC]);
94 }
Jens Axboe8324aa92008-01-29 14:51:59 +010095 }
96
Jens Axboe8324aa92008-01-29 14:51:59 +010097 spin_unlock_irq(q->queue_lock);
98 return ret;
99}
100
101static ssize_t queue_ra_show(struct request_queue *q, char *page)
102{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +0800103 unsigned long ra_kb = q->backing_dev_info.ra_pages <<
104 (PAGE_CACHE_SHIFT - 10);
Jens Axboe8324aa92008-01-29 14:51:59 +0100105
106 return queue_var_show(ra_kb, (page));
107}
108
109static ssize_t
110queue_ra_store(struct request_queue *q, const char *page, size_t count)
111{
112 unsigned long ra_kb;
113 ssize_t ret = queue_var_store(&ra_kb, page, count);
114
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400115 if (ret < 0)
116 return ret;
117
Jens Axboe8324aa92008-01-29 14:51:59 +0100118 q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
Jens Axboe8324aa92008-01-29 14:51:59 +0100119
120 return ret;
121}
122
123static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
124{
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400125 int max_sectors_kb = queue_max_sectors(q) >> 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100126
127 return queue_var_show(max_sectors_kb, (page));
128}
129
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500130static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
131{
132 return queue_var_show(queue_max_segments(q), (page));
133}
134
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200135static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page)
136{
137 return queue_var_show(q->limits.max_integrity_segments, (page));
138}
139
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500140static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
141{
Martin K. Petersene692cb62010-12-01 19:41:49 +0100142 if (blk_queue_cluster(q))
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500143 return queue_var_show(queue_max_segment_size(q), (page));
144
145 return queue_var_show(PAGE_CACHE_SIZE, (page));
146}
147
Martin K. Petersene1defc42009-05-22 17:17:49 -0400148static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page)
Martin K. Petersene68b9032008-01-29 19:14:08 +0100149{
Martin K. Petersene1defc42009-05-22 17:17:49 -0400150 return queue_var_show(queue_logical_block_size(q), page);
Martin K. Petersene68b9032008-01-29 19:14:08 +0100151}
152
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400153static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page)
154{
155 return queue_var_show(queue_physical_block_size(q), page);
156}
157
158static 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
163static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
164{
165 return queue_var_show(queue_io_opt(q), page);
Jens Axboe8324aa92008-01-29 14:51:59 +0100166}
167
Martin K. Petersen86b37282009-11-10 11:50:21 +0100168static 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
173static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
174{
Martin K. Petersena934a002011-05-18 10:37:35 +0200175 return sprintf(page, "%llu\n",
176 (unsigned long long)q->limits.max_discard_sectors << 9);
Martin K. Petersen86b37282009-11-10 11:50:21 +0100177}
178
Martin K. Petersen98262f22009-12-03 09:24:48 +0100179static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
180{
181 return queue_var_show(queue_discard_zeroes_data(q), page);
182}
183
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400184static ssize_t queue_write_same_max_show(struct request_queue *q, char *page)
185{
186 return sprintf(page, "%llu\n",
187 (unsigned long long)q->limits.max_write_same_sectors << 9);
188}
189
190
Jens Axboe8324aa92008-01-29 14:51:59 +0100191static ssize_t
192queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
193{
194 unsigned long max_sectors_kb,
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400195 max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1,
Jens Axboe8324aa92008-01-29 14:51:59 +0100196 page_kb = 1 << (PAGE_CACHE_SHIFT - 10);
197 ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
198
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400199 if (ret < 0)
200 return ret;
201
Jens Axboe8324aa92008-01-29 14:51:59 +0100202 if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
203 return -EINVAL;
Wu Fengguang7c239512008-11-25 09:08:39 +0100204
Jens Axboe8324aa92008-01-29 14:51:59 +0100205 spin_lock_irq(q->queue_lock);
Nikanth Karthikesanc295fc02009-09-01 22:40:15 +0200206 q->limits.max_sectors = max_sectors_kb << 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100207 spin_unlock_irq(q->queue_lock);
208
209 return ret;
210}
211
212static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
213{
Martin K. Petersenae03bf62009-05-22 17:17:50 -0400214 int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1;
Jens Axboe8324aa92008-01-29 14:51:59 +0100215
216 return queue_var_show(max_hw_sectors_kb, (page));
217}
218
Jens Axboe956bcb72010-08-07 18:13:50 +0200219#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
220static ssize_t \
221queue_show_##name(struct request_queue *q, char *page) \
222{ \
223 int bit; \
224 bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
225 return queue_var_show(neg ? !bit : bit, page); \
226} \
227static ssize_t \
228queue_store_##name(struct request_queue *q, const char *page, size_t count) \
229{ \
230 unsigned long val; \
231 ssize_t ret; \
232 ret = queue_var_store(&val, page, count); \
Arnd Bergmannc678ef52013-04-03 21:53:57 +0200233 if (ret < 0) \
234 return ret; \
Jens Axboe956bcb72010-08-07 18:13:50 +0200235 if (neg) \
236 val = !val; \
237 \
238 spin_lock_irq(q->queue_lock); \
239 if (val) \
240 queue_flag_set(QUEUE_FLAG_##flag, q); \
241 else \
242 queue_flag_clear(QUEUE_FLAG_##flag, q); \
243 spin_unlock_irq(q->queue_lock); \
244 return ret; \
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100245}
246
Jens Axboe956bcb72010-08-07 18:13:50 +0200247QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
248QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
249QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
250#undef QUEUE_SYSFS_BIT_FNS
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100251
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200252static ssize_t queue_nomerges_show(struct request_queue *q, char *page)
253{
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100254 return queue_var_show((blk_queue_nomerges(q) << 1) |
255 blk_queue_noxmerges(q), page);
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200256}
257
258static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
259 size_t count)
260{
261 unsigned long nm;
262 ssize_t ret = queue_var_store(&nm, page, count);
263
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400264 if (ret < 0)
265 return ret;
266
Jens Axboebf0f9702008-05-07 09:09:39 +0200267 spin_lock_irq(q->queue_lock);
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100268 queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
269 queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
270 if (nm == 2)
Jens Axboebf0f9702008-05-07 09:09:39 +0200271 queue_flag_set(QUEUE_FLAG_NOMERGES, q);
Alan D. Brunelle488991e2010-01-29 09:04:08 +0100272 else if (nm)
273 queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
Jens Axboebf0f9702008-05-07 09:09:39 +0200274 spin_unlock_irq(q->queue_lock);
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100275
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200276 return ret;
277}
278
Jens Axboec7c22e42008-09-13 20:26:01 +0200279static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
280{
Xiaotian Feng9cb308c2009-07-17 15:26:26 +0800281 bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
Dan Williams5757a6d2011-07-23 20:44:25 +0200282 bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags);
Jens Axboec7c22e42008-09-13 20:26:01 +0200283
Dan Williams5757a6d2011-07-23 20:44:25 +0200284 return queue_var_show(set << force, page);
Jens Axboec7c22e42008-09-13 20:26:01 +0200285}
286
287static ssize_t
288queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
289{
290 ssize_t ret = -EINVAL;
291#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
292 unsigned long val;
293
294 ret = queue_var_store(&val, page, count);
Dave Reisnerb1f3b642012-09-08 11:55:45 -0400295 if (ret < 0)
296 return ret;
297
Jens Axboec7c22e42008-09-13 20:26:01 +0200298 spin_lock_irq(q->queue_lock);
Eric Seppanene8037d42011-08-23 21:25:12 +0200299 if (val == 2) {
Jens Axboec7c22e42008-09-13 20:26:01 +0200300 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
Eric Seppanene8037d42011-08-23 21:25:12 +0200301 queue_flag_set(QUEUE_FLAG_SAME_FORCE, q);
302 } else if (val == 1) {
303 queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
304 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
305 } else if (val == 0) {
Dan Williams5757a6d2011-07-23 20:44:25 +0200306 queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
307 queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q);
308 }
Jens Axboec7c22e42008-09-13 20:26:01 +0200309 spin_unlock_irq(q->queue_lock);
310#endif
311 return ret;
312}
Jens Axboe8324aa92008-01-29 14:51:59 +0100313
314static struct queue_sysfs_entry queue_requests_entry = {
315 .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
316 .show = queue_requests_show,
317 .store = queue_requests_store,
318};
319
320static struct queue_sysfs_entry queue_ra_entry = {
321 .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
322 .show = queue_ra_show,
323 .store = queue_ra_store,
324};
325
326static struct queue_sysfs_entry queue_max_sectors_entry = {
327 .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
328 .show = queue_max_sectors_show,
329 .store = queue_max_sectors_store,
330};
331
332static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
333 .attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
334 .show = queue_max_hw_sectors_show,
335};
336
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500337static struct queue_sysfs_entry queue_max_segments_entry = {
338 .attr = {.name = "max_segments", .mode = S_IRUGO },
339 .show = queue_max_segments_show,
340};
341
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200342static struct queue_sysfs_entry queue_max_integrity_segments_entry = {
343 .attr = {.name = "max_integrity_segments", .mode = S_IRUGO },
344 .show = queue_max_integrity_segments_show,
345};
346
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500347static struct queue_sysfs_entry queue_max_segment_size_entry = {
348 .attr = {.name = "max_segment_size", .mode = S_IRUGO },
349 .show = queue_max_segment_size_show,
350};
351
Jens Axboe8324aa92008-01-29 14:51:59 +0100352static struct queue_sysfs_entry queue_iosched_entry = {
353 .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
354 .show = elv_iosched_show,
355 .store = elv_iosched_store,
356};
357
Martin K. Petersene68b9032008-01-29 19:14:08 +0100358static struct queue_sysfs_entry queue_hw_sector_size_entry = {
359 .attr = {.name = "hw_sector_size", .mode = S_IRUGO },
Martin K. Petersene1defc42009-05-22 17:17:49 -0400360 .show = queue_logical_block_size_show,
361};
362
363static struct queue_sysfs_entry queue_logical_block_size_entry = {
364 .attr = {.name = "logical_block_size", .mode = S_IRUGO },
365 .show = queue_logical_block_size_show,
Martin K. Petersene68b9032008-01-29 19:14:08 +0100366};
367
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400368static struct queue_sysfs_entry queue_physical_block_size_entry = {
369 .attr = {.name = "physical_block_size", .mode = S_IRUGO },
370 .show = queue_physical_block_size_show,
371};
372
373static struct queue_sysfs_entry queue_io_min_entry = {
374 .attr = {.name = "minimum_io_size", .mode = S_IRUGO },
375 .show = queue_io_min_show,
376};
377
378static struct queue_sysfs_entry queue_io_opt_entry = {
379 .attr = {.name = "optimal_io_size", .mode = S_IRUGO },
380 .show = queue_io_opt_show,
Jens Axboe8324aa92008-01-29 14:51:59 +0100381};
382
Martin K. Petersen86b37282009-11-10 11:50:21 +0100383static struct queue_sysfs_entry queue_discard_granularity_entry = {
384 .attr = {.name = "discard_granularity", .mode = S_IRUGO },
385 .show = queue_discard_granularity_show,
386};
387
388static struct queue_sysfs_entry queue_discard_max_entry = {
389 .attr = {.name = "discard_max_bytes", .mode = S_IRUGO },
390 .show = queue_discard_max_show,
391};
392
Martin K. Petersen98262f22009-12-03 09:24:48 +0100393static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
394 .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
395 .show = queue_discard_zeroes_data_show,
396};
397
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400398static struct queue_sysfs_entry queue_write_same_max_entry = {
399 .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO },
400 .show = queue_write_same_max_show,
401};
402
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100403static struct queue_sysfs_entry queue_nonrot_entry = {
404 .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200405 .show = queue_show_nonrot,
406 .store = queue_store_nonrot,
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100407};
408
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200409static struct queue_sysfs_entry queue_nomerges_entry = {
410 .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
411 .show = queue_nomerges_show,
412 .store = queue_nomerges_store,
413};
414
Jens Axboec7c22e42008-09-13 20:26:01 +0200415static struct queue_sysfs_entry queue_rq_affinity_entry = {
416 .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
417 .show = queue_rq_affinity_show,
418 .store = queue_rq_affinity_store,
419};
420
Jens Axboebc58ba92009-01-23 10:54:44 +0100421static struct queue_sysfs_entry queue_iostats_entry = {
422 .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200423 .show = queue_show_iostats,
424 .store = queue_store_iostats,
Jens Axboebc58ba92009-01-23 10:54:44 +0100425};
426
Jens Axboee2e1a142010-06-09 10:42:09 +0200427static struct queue_sysfs_entry queue_random_entry = {
428 .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
Jens Axboe956bcb72010-08-07 18:13:50 +0200429 .show = queue_show_random,
430 .store = queue_store_random,
Jens Axboee2e1a142010-06-09 10:42:09 +0200431};
432
Jens Axboe8324aa92008-01-29 14:51:59 +0100433static struct attribute *default_attrs[] = {
434 &queue_requests_entry.attr,
435 &queue_ra_entry.attr,
436 &queue_max_hw_sectors_entry.attr,
437 &queue_max_sectors_entry.attr,
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500438 &queue_max_segments_entry.attr,
Martin K. Petersen13f05c82010-09-10 20:50:10 +0200439 &queue_max_integrity_segments_entry.attr,
Martin K. Petersenc77a5712010-03-10 00:48:33 -0500440 &queue_max_segment_size_entry.attr,
Jens Axboe8324aa92008-01-29 14:51:59 +0100441 &queue_iosched_entry.attr,
Martin K. Petersene68b9032008-01-29 19:14:08 +0100442 &queue_hw_sector_size_entry.attr,
Martin K. Petersene1defc42009-05-22 17:17:49 -0400443 &queue_logical_block_size_entry.attr,
Martin K. Petersenc72758f2009-05-22 17:17:53 -0400444 &queue_physical_block_size_entry.attr,
445 &queue_io_min_entry.attr,
446 &queue_io_opt_entry.attr,
Martin K. Petersen86b37282009-11-10 11:50:21 +0100447 &queue_discard_granularity_entry.attr,
448 &queue_discard_max_entry.attr,
Martin K. Petersen98262f22009-12-03 09:24:48 +0100449 &queue_discard_zeroes_data_entry.attr,
Martin K. Petersen4363ac72012-09-18 12:19:27 -0400450 &queue_write_same_max_entry.attr,
Bartlomiej Zolnierkiewicz1308835f2009-01-07 12:22:39 +0100451 &queue_nonrot_entry.attr,
Alan D. Brunelleac9fafa2008-04-29 14:44:19 +0200452 &queue_nomerges_entry.attr,
Jens Axboec7c22e42008-09-13 20:26:01 +0200453 &queue_rq_affinity_entry.attr,
Jens Axboebc58ba92009-01-23 10:54:44 +0100454 &queue_iostats_entry.attr,
Jens Axboee2e1a142010-06-09 10:42:09 +0200455 &queue_random_entry.attr,
Jens Axboe8324aa92008-01-29 14:51:59 +0100456 NULL,
457};
458
459#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
460
461static ssize_t
462queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
463{
464 struct queue_sysfs_entry *entry = to_queue(attr);
465 struct request_queue *q =
466 container_of(kobj, struct request_queue, kobj);
467 ssize_t res;
468
469 if (!entry->show)
470 return -EIO;
471 mutex_lock(&q->sysfs_lock);
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100472 if (blk_queue_dying(q)) {
Jens Axboe8324aa92008-01-29 14:51:59 +0100473 mutex_unlock(&q->sysfs_lock);
474 return -ENOENT;
475 }
476 res = entry->show(q, page);
477 mutex_unlock(&q->sysfs_lock);
478 return res;
479}
480
481static ssize_t
482queue_attr_store(struct kobject *kobj, struct attribute *attr,
483 const char *page, size_t length)
484{
485 struct queue_sysfs_entry *entry = to_queue(attr);
Jens Axboe6728cb02008-01-31 13:03:55 +0100486 struct request_queue *q;
Jens Axboe8324aa92008-01-29 14:51:59 +0100487 ssize_t res;
488
489 if (!entry->store)
490 return -EIO;
Jens Axboe6728cb02008-01-31 13:03:55 +0100491
492 q = container_of(kobj, struct request_queue, kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100493 mutex_lock(&q->sysfs_lock);
Bart Van Assche3f3299d2012-11-28 13:42:38 +0100494 if (blk_queue_dying(q)) {
Jens Axboe8324aa92008-01-29 14:51:59 +0100495 mutex_unlock(&q->sysfs_lock);
496 return -ENOENT;
497 }
498 res = entry->store(q, page, length);
499 mutex_unlock(&q->sysfs_lock);
500 return res;
501}
502
Tejun Heo548bc8e2013-01-09 08:05:13 -0800503static void blk_free_queue_rcu(struct rcu_head *rcu_head)
504{
505 struct request_queue *q = container_of(rcu_head, struct request_queue,
506 rcu_head);
507 kmem_cache_free(blk_requestq_cachep, q);
508}
509
Jens Axboe8324aa92008-01-29 14:51:59 +0100510/**
Andrew Morton499337b2011-09-21 10:01:22 +0200511 * blk_release_queue: - release a &struct request_queue when it is no longer needed
512 * @kobj: the kobj belonging to the request queue to be released
Jens Axboe8324aa92008-01-29 14:51:59 +0100513 *
514 * Description:
Andrew Morton499337b2011-09-21 10:01:22 +0200515 * blk_release_queue is the pair to blk_init_queue() or
Jens Axboe8324aa92008-01-29 14:51:59 +0100516 * blk_queue_make_request(). It should be called when a request queue is
517 * being released; typically when a block device is being de-registered.
518 * Currently, its primary task it to free all the &struct request
519 * structures that were allocated to the queue and the queue itself.
520 *
521 * Caveat:
522 * Hopefully the low level driver will have finished any
523 * outstanding requests first...
524 **/
525static void blk_release_queue(struct kobject *kobj)
526{
527 struct request_queue *q =
528 container_of(kobj, struct request_queue, kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100529
530 blk_sync_queue(q);
531
Tejun Heoe8989fa2012-03-05 13:15:20 -0800532 blkcg_exit_queue(q);
533
Tejun Heo7e5a8792011-12-14 00:33:42 +0100534 if (q->elevator) {
535 spin_lock_irq(q->queue_lock);
536 ioc_clear_queue(q);
537 spin_unlock_irq(q->queue_lock);
Hannes Reinecke777eb1b2011-09-28 08:07:01 -0600538 elevator_exit(q->elevator);
Tejun Heo7e5a8792011-12-14 00:33:42 +0100539 }
Hannes Reinecke777eb1b2011-09-28 08:07:01 -0600540
Tejun Heoa0516612012-06-26 15:05:44 -0700541 blk_exit_rl(&q->root_rl);
Jens Axboe8324aa92008-01-29 14:51:59 +0100542
543 if (q->queue_tags)
544 __blk_queue_free_tags(q);
545
Jens Axboe320ae512013-10-24 09:20:05 +0100546 percpu_counter_destroy(&q->mq_usage_counter);
547
548 if (q->mq_ops)
549 blk_mq_free_queue(q);
550
Jens Axboe8324aa92008-01-29 14:51:59 +0100551 blk_trace_shutdown(q);
552
553 bdi_destroy(&q->backing_dev_info);
Tejun Heoa73f7302011-12-14 00:33:37 +0100554
555 ida_simple_remove(&blk_queue_ida, q->id);
Tejun Heo548bc8e2013-01-09 08:05:13 -0800556 call_rcu(&q->rcu_head, blk_free_queue_rcu);
Jens Axboe8324aa92008-01-29 14:51:59 +0100557}
558
Emese Revfy52cf25d2010-01-19 02:58:23 +0100559static const struct sysfs_ops queue_sysfs_ops = {
Jens Axboe8324aa92008-01-29 14:51:59 +0100560 .show = queue_attr_show,
561 .store = queue_attr_store,
562};
563
564struct kobj_type blk_queue_ktype = {
565 .sysfs_ops = &queue_sysfs_ops,
566 .default_attrs = default_attrs,
567 .release = blk_release_queue,
568};
569
570int blk_register_queue(struct gendisk *disk)
571{
572 int ret;
Li Zefan1d54ad62009-04-14 14:00:05 +0800573 struct device *dev = disk_to_dev(disk);
Jens Axboe8324aa92008-01-29 14:51:59 +0100574 struct request_queue *q = disk->queue;
575
Akinobu Mitafb199742008-04-21 09:51:06 +0200576 if (WARN_ON(!q))
Jens Axboe8324aa92008-01-29 14:51:59 +0100577 return -ENXIO;
578
Tejun Heo749fefe2012-09-20 14:08:52 -0700579 /*
580 * Initialization must be complete by now. Finish the initial
581 * bypass from queue allocation.
582 */
583 blk_queue_bypass_end(q);
Jens Axboe320ae512013-10-24 09:20:05 +0100584 queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q);
Tejun Heo749fefe2012-09-20 14:08:52 -0700585
Li Zefan1d54ad62009-04-14 14:00:05 +0800586 ret = blk_trace_init_sysfs(dev);
587 if (ret)
588 return ret;
589
Linus Torvaldsc9059592009-06-11 10:52:27 -0700590 ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
Liu Yuaned5302d2011-04-19 13:47:58 +0200591 if (ret < 0) {
592 blk_trace_remove_sysfs(dev);
Jens Axboe8324aa92008-01-29 14:51:59 +0100593 return ret;
Liu Yuaned5302d2011-04-19 13:47:58 +0200594 }
Jens Axboe8324aa92008-01-29 14:51:59 +0100595
596 kobject_uevent(&q->kobj, KOBJ_ADD);
597
Jens Axboe320ae512013-10-24 09:20:05 +0100598 if (q->mq_ops)
599 blk_mq_register_disk(disk);
600
Martin K. Petersencd43e262009-05-22 17:17:52 -0400601 if (!q->request_fn)
602 return 0;
603
Jens Axboe8324aa92008-01-29 14:51:59 +0100604 ret = elv_register_queue(q);
605 if (ret) {
606 kobject_uevent(&q->kobj, KOBJ_REMOVE);
607 kobject_del(&q->kobj);
Liu Yuan80656b62011-04-13 22:14:54 +0200608 blk_trace_remove_sysfs(dev);
Xiaotian Fengc87ffbb2010-08-23 12:30:29 +0200609 kobject_put(&dev->kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100610 return ret;
611 }
612
613 return 0;
614}
615
616void blk_unregister_queue(struct gendisk *disk)
617{
618 struct request_queue *q = disk->queue;
619
Akinobu Mitafb199742008-04-21 09:51:06 +0200620 if (WARN_ON(!q))
621 return;
622
Jens Axboe320ae512013-10-24 09:20:05 +0100623 if (q->mq_ops)
624 blk_mq_unregister_disk(disk);
625
Zdenek Kabelac48c0d4d2009-09-25 06:19:26 +0200626 if (q->request_fn)
Jens Axboe8324aa92008-01-29 14:51:59 +0100627 elv_unregister_queue(q);
628
Zdenek Kabelac48c0d4d2009-09-25 06:19:26 +0200629 kobject_uevent(&q->kobj, KOBJ_REMOVE);
630 kobject_del(&q->kobj);
631 blk_trace_remove_sysfs(disk_to_dev(disk));
632 kobject_put(&disk_to_dev(disk)->kobj);
Jens Axboe8324aa92008-01-29 14:51:59 +0100633}