blob: ba6cf8e9aa0a598a50d4b24eb2c8f2914bf5c5ef [file] [log] [blame]
Jens Axboe320ae512013-10-24 09:20:05 +01001#include <linux/kernel.h>
2#include <linux/module.h>
3#include <linux/backing-dev.h>
4#include <linux/bio.h>
5#include <linux/blkdev.h>
6#include <linux/mm.h>
7#include <linux/init.h>
8#include <linux/slab.h>
9#include <linux/workqueue.h>
10#include <linux/smp.h>
11
12#include <linux/blk-mq.h>
13#include "blk-mq.h"
14#include "blk-mq-tag.h"
15
16static void blk_mq_sysfs_release(struct kobject *kobj)
17{
18}
19
20struct blk_mq_ctx_sysfs_entry {
21 struct attribute attr;
22 ssize_t (*show)(struct blk_mq_ctx *, char *);
23 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
24};
25
26struct blk_mq_hw_ctx_sysfs_entry {
27 struct attribute attr;
28 ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
29 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
30};
31
32static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
33 char *page)
34{
35 struct blk_mq_ctx_sysfs_entry *entry;
36 struct blk_mq_ctx *ctx;
37 struct request_queue *q;
38 ssize_t res;
39
40 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
41 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
42 q = ctx->queue;
43
44 if (!entry->show)
45 return -EIO;
46
47 res = -ENOENT;
48 mutex_lock(&q->sysfs_lock);
49 if (!blk_queue_dying(q))
50 res = entry->show(ctx, page);
51 mutex_unlock(&q->sysfs_lock);
52 return res;
53}
54
55static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
56 const char *page, size_t length)
57{
58 struct blk_mq_ctx_sysfs_entry *entry;
59 struct blk_mq_ctx *ctx;
60 struct request_queue *q;
61 ssize_t res;
62
63 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
64 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
65 q = ctx->queue;
66
67 if (!entry->store)
68 return -EIO;
69
70 res = -ENOENT;
71 mutex_lock(&q->sysfs_lock);
72 if (!blk_queue_dying(q))
73 res = entry->store(ctx, page, length);
74 mutex_unlock(&q->sysfs_lock);
75 return res;
76}
77
78static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
79 struct attribute *attr, char *page)
80{
81 struct blk_mq_hw_ctx_sysfs_entry *entry;
82 struct blk_mq_hw_ctx *hctx;
83 struct request_queue *q;
84 ssize_t res;
85
86 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
87 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
88 q = hctx->queue;
89
90 if (!entry->show)
91 return -EIO;
92
93 res = -ENOENT;
94 mutex_lock(&q->sysfs_lock);
95 if (!blk_queue_dying(q))
96 res = entry->show(hctx, page);
97 mutex_unlock(&q->sysfs_lock);
98 return res;
99}
100
101static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
102 struct attribute *attr, const char *page,
103 size_t length)
104{
105 struct blk_mq_hw_ctx_sysfs_entry *entry;
106 struct blk_mq_hw_ctx *hctx;
107 struct request_queue *q;
108 ssize_t res;
109
110 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
111 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
112 q = hctx->queue;
113
114 if (!entry->store)
115 return -EIO;
116
117 res = -ENOENT;
118 mutex_lock(&q->sysfs_lock);
119 if (!blk_queue_dying(q))
120 res = entry->store(hctx, page, length);
121 mutex_unlock(&q->sysfs_lock);
122 return res;
123}
124
125static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page)
126{
127 return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
128 ctx->rq_dispatched[0]);
129}
130
131static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page)
132{
133 return sprintf(page, "%lu\n", ctx->rq_merged);
134}
135
136static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
137{
138 return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
139 ctx->rq_completed[0]);
140}
141
142static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
143{
144 char *start_page = page;
145 struct request *rq;
146
147 page += sprintf(page, "%s:\n", msg);
148
149 list_for_each_entry(rq, list, queuelist)
150 page += sprintf(page, "\t%p\n", rq);
151
152 return page - start_page;
153}
154
155static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
156{
157 ssize_t ret;
158
159 spin_lock(&ctx->lock);
160 ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
161 spin_unlock(&ctx->lock);
162
163 return ret;
164}
165
166static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
167 char *page)
168{
169 return sprintf(page, "%lu\n", hctx->queued);
170}
171
172static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
173{
174 return sprintf(page, "%lu\n", hctx->run);
175}
176
177static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
178 char *page)
179{
180 char *start_page = page;
181 int i;
182
183 page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
184
185 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
186 unsigned long d = 1U << (i - 1);
187
188 page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
189 }
190
191 return page - start_page;
192}
193
194static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
195 char *page)
196{
197 ssize_t ret;
198
199 spin_lock(&hctx->lock);
200 ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
201 spin_unlock(&hctx->lock);
202
203 return ret;
204}
205
206static ssize_t blk_mq_hw_sysfs_ipi_show(struct blk_mq_hw_ctx *hctx, char *page)
207{
208 ssize_t ret;
209
210 spin_lock(&hctx->lock);
211 ret = sprintf(page, "%u\n", !!(hctx->flags & BLK_MQ_F_SHOULD_IPI));
212 spin_unlock(&hctx->lock);
213
214 return ret;
215}
216
217static ssize_t blk_mq_hw_sysfs_ipi_store(struct blk_mq_hw_ctx *hctx,
218 const char *page, size_t len)
219{
220 struct blk_mq_ctx *ctx;
221 unsigned long ret;
222 unsigned int i;
223
224 if (kstrtoul(page, 10, &ret)) {
225 pr_err("blk-mq-sysfs: invalid input '%s'\n", page);
226 return -EINVAL;
227 }
228
229 spin_lock(&hctx->lock);
230 if (ret)
231 hctx->flags |= BLK_MQ_F_SHOULD_IPI;
232 else
233 hctx->flags &= ~BLK_MQ_F_SHOULD_IPI;
234 spin_unlock(&hctx->lock);
235
236 hctx_for_each_ctx(hctx, ctx, i)
237 ctx->ipi_redirect = !!ret;
238
239 return len;
240}
241
242static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
243{
244 return blk_mq_tag_sysfs_show(hctx->tags, page);
245}
246
247static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
248 .attr = {.name = "dispatched", .mode = S_IRUGO },
249 .show = blk_mq_sysfs_dispatched_show,
250};
251static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
252 .attr = {.name = "merged", .mode = S_IRUGO },
253 .show = blk_mq_sysfs_merged_show,
254};
255static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
256 .attr = {.name = "completed", .mode = S_IRUGO },
257 .show = blk_mq_sysfs_completed_show,
258};
259static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
260 .attr = {.name = "rq_list", .mode = S_IRUGO },
261 .show = blk_mq_sysfs_rq_list_show,
262};
263
264static struct attribute *default_ctx_attrs[] = {
265 &blk_mq_sysfs_dispatched.attr,
266 &blk_mq_sysfs_merged.attr,
267 &blk_mq_sysfs_completed.attr,
268 &blk_mq_sysfs_rq_list.attr,
269 NULL,
270};
271
272static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
273 .attr = {.name = "queued", .mode = S_IRUGO },
274 .show = blk_mq_hw_sysfs_queued_show,
275};
276static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
277 .attr = {.name = "run", .mode = S_IRUGO },
278 .show = blk_mq_hw_sysfs_run_show,
279};
280static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
281 .attr = {.name = "dispatched", .mode = S_IRUGO },
282 .show = blk_mq_hw_sysfs_dispatched_show,
283};
284static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
285 .attr = {.name = "pending", .mode = S_IRUGO },
286 .show = blk_mq_hw_sysfs_rq_list_show,
287};
288static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_ipi = {
289 .attr = {.name = "ipi_redirect", .mode = S_IRUGO | S_IWUSR},
290 .show = blk_mq_hw_sysfs_ipi_show,
291 .store = blk_mq_hw_sysfs_ipi_store,
292};
293static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
294 .attr = {.name = "tags", .mode = S_IRUGO },
295 .show = blk_mq_hw_sysfs_tags_show,
296};
297
298static struct attribute *default_hw_ctx_attrs[] = {
299 &blk_mq_hw_sysfs_queued.attr,
300 &blk_mq_hw_sysfs_run.attr,
301 &blk_mq_hw_sysfs_dispatched.attr,
302 &blk_mq_hw_sysfs_pending.attr,
303 &blk_mq_hw_sysfs_ipi.attr,
304 &blk_mq_hw_sysfs_tags.attr,
305 NULL,
306};
307
308static const struct sysfs_ops blk_mq_sysfs_ops = {
309 .show = blk_mq_sysfs_show,
310 .store = blk_mq_sysfs_store,
311};
312
313static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
314 .show = blk_mq_hw_sysfs_show,
315 .store = blk_mq_hw_sysfs_store,
316};
317
318static struct kobj_type blk_mq_ktype = {
319 .sysfs_ops = &blk_mq_sysfs_ops,
320 .release = blk_mq_sysfs_release,
321};
322
323static struct kobj_type blk_mq_ctx_ktype = {
324 .sysfs_ops = &blk_mq_sysfs_ops,
325 .default_attrs = default_ctx_attrs,
326 .release = blk_mq_sysfs_release,
327};
328
329static struct kobj_type blk_mq_hw_ktype = {
330 .sysfs_ops = &blk_mq_hw_sysfs_ops,
331 .default_attrs = default_hw_ctx_attrs,
332 .release = blk_mq_sysfs_release,
333};
334
335void blk_mq_unregister_disk(struct gendisk *disk)
336{
337 struct request_queue *q = disk->queue;
338
339 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
340 kobject_del(&q->mq_kobj);
341
342 kobject_put(&disk_to_dev(disk)->kobj);
343}
344
345int blk_mq_register_disk(struct gendisk *disk)
346{
347 struct device *dev = disk_to_dev(disk);
348 struct request_queue *q = disk->queue;
349 struct blk_mq_hw_ctx *hctx;
350 struct blk_mq_ctx *ctx;
351 int ret, i, j;
352
353 kobject_init(&q->mq_kobj, &blk_mq_ktype);
354
355 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
356 if (ret < 0)
357 return ret;
358
359 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
360
361 queue_for_each_hw_ctx(q, hctx, i) {
362 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
363 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", i);
364 if (ret)
365 break;
366
367 if (!hctx->nr_ctx)
368 continue;
369
370 hctx_for_each_ctx(hctx, ctx, j) {
371 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
372 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
373 if (ret)
374 break;
375 }
376 }
377
378 if (ret) {
379 blk_mq_unregister_disk(disk);
380 return ret;
381 }
382
383 return 0;
384}