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block/blk-mq-sysfs.c
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#include <linux/kernel.h> #include <linux/module.h> #include <linux/backing-dev.h> #include <linux/bio.h> #include <linux/blkdev.h> #include <linux/mm.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/workqueue.h> #include <linux/smp.h> #include <linux/blk-mq.h> #include "blk-mq.h" #include "blk-mq-tag.h" static void blk_mq_sysfs_release(struct kobject *kobj) { } struct blk_mq_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_ctx *, char *); ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); }; struct blk_mq_hw_ctx_sysfs_entry { struct attribute attr; ssize_t (*show)(struct blk_mq_hw_ctx *, char *); ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); }; static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(ctx, page); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_ctx_sysfs_entry *entry; struct blk_mq_ctx *ctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); ctx = container_of(kobj, struct blk_mq_ctx, kobj); q = ctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(ctx, page, length); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, struct attribute *attr, char *page) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->show) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->show(hctx, page); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, struct attribute *attr, const char *page, size_t length) { struct blk_mq_hw_ctx_sysfs_entry *entry; struct blk_mq_hw_ctx *hctx; struct request_queue *q; ssize_t res; entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); q = hctx->queue; if (!entry->store) return -EIO; res = -ENOENT; mutex_lock(&q->sysfs_lock); if (!blk_queue_dying(q)) res = entry->store(hctx, page, length); mutex_unlock(&q->sysfs_lock); return res; } static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page) { return sprintf(page, "%lu %lu ", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); } static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page) { return sprintf(page, "%lu ", ctx->rq_merged); } static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page) { return sprintf(page, "%lu %lu ", ctx->rq_completed[1], ctx->rq_completed[0]); } static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg) { char *start_page = page; struct request *rq; page += sprintf(page, "%s: ", msg); list_for_each_entry(rq, list, queuelist) page += sprintf(page, "\t%p ", rq); return page - start_page; } static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page) { ssize_t ret; spin_lock(&ctx->lock); ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending"); spin_unlock(&ctx->lock); return ret; } static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%lu ", hctx->queued); } static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%lu ", hctx->run); } static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx, char *page) { char *start_page = page; int i; page += sprintf(page, "%8u\t%lu ", 0U, hctx->dispatched[0]); for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) { unsigned long d = 1U << (i - 1); page += sprintf(page, "%8lu\t%lu ", d, hctx->dispatched[i]); } return page - start_page; } static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx, char *page) { ssize_t ret; spin_lock(&hctx->lock); ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending"); spin_unlock(&hctx->lock); return ret; } |
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static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page) { return blk_mq_tag_sysfs_show(hctx->tags, page); } |
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static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page) { return sprintf(page, "%u ", atomic_read(&hctx->nr_active)); } |
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static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page) { |
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unsigned int i, first = 1; |
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ssize_t ret = 0; blk_mq_disable_hotplug(); |
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for_each_cpu(i, hctx->cpumask) { |
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if (first) ret += sprintf(ret + page, "%u", i); else ret += sprintf(ret + page, ", %u", i); first = 0; } blk_mq_enable_hotplug(); ret += sprintf(ret + page, " "); return ret; } |
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static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = { .attr = {.name = "dispatched", .mode = S_IRUGO }, .show = blk_mq_sysfs_dispatched_show, }; static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = { .attr = {.name = "merged", .mode = S_IRUGO }, .show = blk_mq_sysfs_merged_show, }; static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = { .attr = {.name = "completed", .mode = S_IRUGO }, .show = blk_mq_sysfs_completed_show, }; static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = { .attr = {.name = "rq_list", .mode = S_IRUGO }, .show = blk_mq_sysfs_rq_list_show, }; static struct attribute *default_ctx_attrs[] = { &blk_mq_sysfs_dispatched.attr, &blk_mq_sysfs_merged.attr, &blk_mq_sysfs_completed.attr, &blk_mq_sysfs_rq_list.attr, NULL, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = { .attr = {.name = "queued", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_queued_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = { .attr = {.name = "run", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_run_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = { .attr = {.name = "dispatched", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_dispatched_show, }; |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = { .attr = {.name = "active", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_active_show, }; |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = { .attr = {.name = "pending", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_rq_list_show, }; |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = { .attr = {.name = "tags", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_tags_show, }; |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { .attr = {.name = "cpu_list", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_cpus_show, }; |
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static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_queued.attr, &blk_mq_hw_sysfs_run.attr, &blk_mq_hw_sysfs_dispatched.attr, &blk_mq_hw_sysfs_pending.attr, |
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&blk_mq_hw_sysfs_tags.attr, |
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&blk_mq_hw_sysfs_cpus.attr, |
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&blk_mq_hw_sysfs_active.attr, |
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NULL, }; static const struct sysfs_ops blk_mq_sysfs_ops = { .show = blk_mq_sysfs_show, .store = blk_mq_sysfs_store, }; static const struct sysfs_ops blk_mq_hw_sysfs_ops = { .show = blk_mq_hw_sysfs_show, .store = blk_mq_hw_sysfs_store, }; static struct kobj_type blk_mq_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_ctx_ktype = { .sysfs_ops = &blk_mq_sysfs_ops, .default_attrs = default_ctx_attrs, .release = blk_mq_sysfs_release, }; static struct kobj_type blk_mq_hw_ktype = { .sysfs_ops = &blk_mq_hw_sysfs_ops, .default_attrs = default_hw_ctx_attrs, .release = blk_mq_sysfs_release, }; |
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static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx) |
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{ struct blk_mq_ctx *ctx; int i; if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP)) return; hctx_for_each_ctx(hctx, ctx, i) kobject_del(&ctx->kobj); kobject_del(&hctx->kobj); } |
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static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx) |
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{ struct request_queue *q = hctx->queue; struct blk_mq_ctx *ctx; int i, ret; if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP)) return 0; ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num); if (ret) return ret; hctx_for_each_ctx(hctx, ctx, i) { ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); if (ret) break; } return ret; } |
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void blk_mq_unregister_disk(struct gendisk *disk) { struct request_queue *q = disk->queue; |
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struct blk_mq_hw_ctx *hctx; struct blk_mq_ctx *ctx; int i, j; queue_for_each_hw_ctx(q, hctx, i) { |
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blk_mq_unregister_hctx(hctx); hctx_for_each_ctx(hctx, ctx, j) |
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kobject_put(&ctx->kobj); |
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|
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kobject_put(&hctx->kobj); } |
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kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); kobject_del(&q->mq_kobj); |
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kobject_put(&q->mq_kobj); |
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kobject_put(&disk_to_dev(disk)->kobj); } |
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static void blk_mq_sysfs_init(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; struct blk_mq_ctx *ctx; |
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int i; |
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kobject_init(&q->mq_kobj, &blk_mq_ktype); |
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queue_for_each_hw_ctx(q, hctx, i) |
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kobject_init(&hctx->kobj, &blk_mq_hw_ktype); |
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queue_for_each_ctx(q, ctx, i) kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
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} |
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/* see blk_register_queue() */ void blk_mq_finish_init(struct request_queue *q) { percpu_ref_switch_to_percpu(&q->mq_usage_counter); } |
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int blk_mq_register_disk(struct gendisk *disk) { struct device *dev = disk_to_dev(disk); struct request_queue *q = disk->queue; struct blk_mq_hw_ctx *hctx; |
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int ret, i; |
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blk_mq_sysfs_init(q); |
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ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); if (ret < 0) return ret; kobject_uevent(&q->mq_kobj, KOBJ_ADD); queue_for_each_hw_ctx(q, hctx, i) { |
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hctx->flags |= BLK_MQ_F_SYSFS_UP; ret = blk_mq_register_hctx(hctx); |
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if (ret) break; |
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} if (ret) { blk_mq_unregister_disk(disk); return ret; } return 0; } |
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void blk_mq_sysfs_unregister(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); } int blk_mq_sysfs_register(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i, ret = 0; queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) break; } return ret; } |