1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/backing-dev.h>
5 #include <linux/blkdev.h>
7 #include <linux/init.h>
8 #include <linux/slab.h>
9 #include <linux/workqueue.h>
10 #include <linux/smp.h>
12 #include <linux/blk-mq.h>
14 #include "blk-mq-tag.h"
16 static void blk_mq_sysfs_release(struct kobject *kobj)
20 struct 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);
26 struct 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);
32 static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
35 struct blk_mq_ctx_sysfs_entry *entry;
36 struct blk_mq_ctx *ctx;
37 struct request_queue *q;
40 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
41 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
48 mutex_lock(&q->sysfs_lock);
49 if (!blk_queue_dying(q))
50 res = entry->show(ctx, page);
51 mutex_unlock(&q->sysfs_lock);
55 static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
56 const char *page, size_t length)
58 struct blk_mq_ctx_sysfs_entry *entry;
59 struct blk_mq_ctx *ctx;
60 struct request_queue *q;
63 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
64 ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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);
78 static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
79 struct attribute *attr, char *page)
81 struct blk_mq_hw_ctx_sysfs_entry *entry;
82 struct blk_mq_hw_ctx *hctx;
83 struct request_queue *q;
86 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
87 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
94 mutex_lock(&q->sysfs_lock);
95 if (!blk_queue_dying(q))
96 res = entry->show(hctx, page);
97 mutex_unlock(&q->sysfs_lock);
101 static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
102 struct attribute *attr, const char *page,
105 struct blk_mq_hw_ctx_sysfs_entry *entry;
106 struct blk_mq_hw_ctx *hctx;
107 struct request_queue *q;
110 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
111 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
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);
125 static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page)
127 return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
128 ctx->rq_dispatched[0]);
131 static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page)
133 return sprintf(page, "%lu\n", ctx->rq_merged);
136 static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
138 return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
139 ctx->rq_completed[0]);
142 static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
145 int len = snprintf(page, PAGE_SIZE - 1, "%s:\n", msg);
147 list_for_each_entry(rq, list, queuelist) {
148 const int rq_len = 2 * sizeof(rq) + 2;
150 /* if the output will be truncated */
151 if (PAGE_SIZE - 1 < len + rq_len) {
152 /* backspacing if it can't hold '\t...\n' */
153 if (PAGE_SIZE - 1 < len + 5)
155 len += snprintf(page + len, PAGE_SIZE - 1 - len,
159 len += snprintf(page + len, PAGE_SIZE - 1 - len,
166 static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
170 spin_lock(&ctx->lock);
171 ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
172 spin_unlock(&ctx->lock);
177 static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx *hctx, char *page)
179 return sprintf(page, "considered=%lu, invoked=%lu, success=%lu\n",
180 hctx->poll_considered, hctx->poll_invoked,
184 static ssize_t blk_mq_hw_sysfs_poll_store(struct blk_mq_hw_ctx *hctx,
185 const char *page, size_t size)
187 hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
192 static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
195 return sprintf(page, "%lu\n", hctx->queued);
198 static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
200 return sprintf(page, "%lu\n", hctx->run);
203 static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
206 char *start_page = page;
209 page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
211 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
212 unsigned long d = 1U << (i - 1);
214 page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
217 return page - start_page;
220 static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
225 spin_lock(&hctx->lock);
226 ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
227 spin_unlock(&hctx->lock);
232 static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
234 return blk_mq_tag_sysfs_show(hctx->tags, page);
237 static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
239 return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
242 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
244 unsigned int i, first = 1;
247 for_each_cpu(i, hctx->cpumask) {
249 ret += sprintf(ret + page, "%u", i);
251 ret += sprintf(ret + page, ", %u", i);
256 ret += sprintf(ret + page, "\n");
260 static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
261 .attr = {.name = "dispatched", .mode = S_IRUGO },
262 .show = blk_mq_sysfs_dispatched_show,
264 static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
265 .attr = {.name = "merged", .mode = S_IRUGO },
266 .show = blk_mq_sysfs_merged_show,
268 static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
269 .attr = {.name = "completed", .mode = S_IRUGO },
270 .show = blk_mq_sysfs_completed_show,
272 static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
273 .attr = {.name = "rq_list", .mode = S_IRUGO },
274 .show = blk_mq_sysfs_rq_list_show,
277 static struct attribute *default_ctx_attrs[] = {
278 &blk_mq_sysfs_dispatched.attr,
279 &blk_mq_sysfs_merged.attr,
280 &blk_mq_sysfs_completed.attr,
281 &blk_mq_sysfs_rq_list.attr,
285 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
286 .attr = {.name = "queued", .mode = S_IRUGO },
287 .show = blk_mq_hw_sysfs_queued_show,
289 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
290 .attr = {.name = "run", .mode = S_IRUGO },
291 .show = blk_mq_hw_sysfs_run_show,
293 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
294 .attr = {.name = "dispatched", .mode = S_IRUGO },
295 .show = blk_mq_hw_sysfs_dispatched_show,
297 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
298 .attr = {.name = "active", .mode = S_IRUGO },
299 .show = blk_mq_hw_sysfs_active_show,
301 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
302 .attr = {.name = "pending", .mode = S_IRUGO },
303 .show = blk_mq_hw_sysfs_rq_list_show,
305 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
306 .attr = {.name = "tags", .mode = S_IRUGO },
307 .show = blk_mq_hw_sysfs_tags_show,
309 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
310 .attr = {.name = "cpu_list", .mode = S_IRUGO },
311 .show = blk_mq_hw_sysfs_cpus_show,
313 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = {
314 .attr = {.name = "io_poll", .mode = S_IWUSR | S_IRUGO },
315 .show = blk_mq_hw_sysfs_poll_show,
316 .store = blk_mq_hw_sysfs_poll_store,
319 static struct attribute *default_hw_ctx_attrs[] = {
320 &blk_mq_hw_sysfs_queued.attr,
321 &blk_mq_hw_sysfs_run.attr,
322 &blk_mq_hw_sysfs_dispatched.attr,
323 &blk_mq_hw_sysfs_pending.attr,
324 &blk_mq_hw_sysfs_tags.attr,
325 &blk_mq_hw_sysfs_cpus.attr,
326 &blk_mq_hw_sysfs_active.attr,
327 &blk_mq_hw_sysfs_poll.attr,
331 static const struct sysfs_ops blk_mq_sysfs_ops = {
332 .show = blk_mq_sysfs_show,
333 .store = blk_mq_sysfs_store,
336 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
337 .show = blk_mq_hw_sysfs_show,
338 .store = blk_mq_hw_sysfs_store,
341 static struct kobj_type blk_mq_ktype = {
342 .sysfs_ops = &blk_mq_sysfs_ops,
343 .release = blk_mq_sysfs_release,
346 static struct kobj_type blk_mq_ctx_ktype = {
347 .sysfs_ops = &blk_mq_sysfs_ops,
348 .default_attrs = default_ctx_attrs,
349 .release = blk_mq_sysfs_release,
352 static struct kobj_type blk_mq_hw_ktype = {
353 .sysfs_ops = &blk_mq_hw_sysfs_ops,
354 .default_attrs = default_hw_ctx_attrs,
355 .release = blk_mq_sysfs_release,
358 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
360 struct blk_mq_ctx *ctx;
366 hctx_for_each_ctx(hctx, ctx, i)
367 kobject_del(&ctx->kobj);
369 kobject_del(&hctx->kobj);
372 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
374 struct request_queue *q = hctx->queue;
375 struct blk_mq_ctx *ctx;
381 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
385 hctx_for_each_ctx(hctx, ctx, i) {
386 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
394 static void __blk_mq_unregister_disk(struct gendisk *disk)
396 struct request_queue *q = disk->queue;
397 struct blk_mq_hw_ctx *hctx;
398 struct blk_mq_ctx *ctx;
401 queue_for_each_hw_ctx(q, hctx, i) {
402 blk_mq_unregister_hctx(hctx);
404 hctx_for_each_ctx(hctx, ctx, j)
405 kobject_put(&ctx->kobj);
407 kobject_put(&hctx->kobj);
410 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
411 kobject_del(&q->mq_kobj);
412 kobject_put(&q->mq_kobj);
414 kobject_put(&disk_to_dev(disk)->kobj);
416 q->mq_sysfs_init_done = false;
419 void blk_mq_unregister_disk(struct gendisk *disk)
421 blk_mq_disable_hotplug();
422 __blk_mq_unregister_disk(disk);
423 blk_mq_enable_hotplug();
426 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
428 kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
431 static void blk_mq_sysfs_init(struct request_queue *q)
433 struct blk_mq_ctx *ctx;
436 kobject_init(&q->mq_kobj, &blk_mq_ktype);
438 for_each_possible_cpu(cpu) {
439 ctx = per_cpu_ptr(q->queue_ctx, cpu);
440 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
444 int blk_mq_register_disk(struct gendisk *disk)
446 struct device *dev = disk_to_dev(disk);
447 struct request_queue *q = disk->queue;
448 struct blk_mq_hw_ctx *hctx;
451 blk_mq_disable_hotplug();
453 blk_mq_sysfs_init(q);
455 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
459 kobject_uevent(&q->mq_kobj, KOBJ_ADD);
461 queue_for_each_hw_ctx(q, hctx, i) {
462 ret = blk_mq_register_hctx(hctx);
468 __blk_mq_unregister_disk(disk);
470 q->mq_sysfs_init_done = true;
472 blk_mq_enable_hotplug();
476 EXPORT_SYMBOL_GPL(blk_mq_register_disk);
478 void blk_mq_sysfs_unregister(struct request_queue *q)
480 struct blk_mq_hw_ctx *hctx;
483 if (!q->mq_sysfs_init_done)
486 queue_for_each_hw_ctx(q, hctx, i)
487 blk_mq_unregister_hctx(hctx);
490 int blk_mq_sysfs_register(struct request_queue *q)
492 struct blk_mq_hw_ctx *hctx;
495 if (!q->mq_sysfs_init_done)
498 queue_for_each_hw_ctx(q, hctx, i) {
499 ret = blk_mq_register_hctx(hctx);