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block/blk-mq-sysfs.c
8.31 KB
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// SPDX-License-Identifier: GPL-2.0 |
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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> |
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#include "blk.h" |
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#include "blk-mq.h" #include "blk-mq-tag.h" static void blk_mq_sysfs_release(struct kobject *kobj) { |
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struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj); free_percpu(ctxs->queue_ctx); kfree(ctxs); } static void blk_mq_ctx_sysfs_release(struct kobject *kobj) { struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj); /* ctx->ctxs won't be released until all ctx are freed */ kobject_put(&ctx->ctxs->kobj); |
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} |
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static void blk_mq_hw_sysfs_release(struct kobject *kobj) { struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); |
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if (hctx->flags & BLK_MQ_F_BLOCKING) cleanup_srcu_struct(hctx->srcu); blk_free_flush_queue(hctx->fq); sbitmap_free(&hctx->ctx_map); |
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free_cpumask_var(hctx->cpumask); |
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kfree(hctx->ctxs); kfree(hctx); } |
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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; |
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mutex_lock(&q->sysfs_lock); |
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res = entry->show(ctx, page); |
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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; |
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mutex_lock(&q->sysfs_lock); |
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res = entry->store(ctx, page, length); |
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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; |
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mutex_lock(&q->sysfs_lock); |
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res = entry->show(hctx, page); |
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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; |
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mutex_lock(&q->sysfs_lock); |
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res = entry->store(hctx, page, length); |
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mutex_unlock(&q->sysfs_lock); return res; } |
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static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx, char *page) |
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{ |
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return sprintf(page, "%u ", hctx->tags->nr_tags); |
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} |
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static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx, char *page) |
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{ |
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return sprintf(page, "%u ", hctx->tags->nr_reserved_tags); |
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} |
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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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const size_t size = PAGE_SIZE - 1; |
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unsigned int i, first = 1; |
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int ret = 0, pos = 0; |
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|
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for_each_cpu(i, hctx->cpumask) { |
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if (first) |
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ret = snprintf(pos + page, size - pos, "%u", i); |
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else |
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ret = snprintf(pos + page, size - pos, ", %u", i); if (ret >= size - pos) break; |
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first = 0; |
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pos += ret; |
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} |
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ret = snprintf(pos + page, size + 1 - pos, " "); |
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return pos + ret; |
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} |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = { |
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.attr = {.name = "nr_tags", .mode = 0444 }, |
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.show = blk_mq_hw_sysfs_nr_tags_show, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = { |
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.attr = {.name = "nr_reserved_tags", .mode = 0444 }, |
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.show = blk_mq_hw_sysfs_nr_reserved_tags_show, }; |
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { |
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.attr = {.name = "cpu_list", .mode = 0444 }, |
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.show = blk_mq_hw_sysfs_cpus_show, }; |
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static struct attribute *default_hw_ctx_attrs[] = { |
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&blk_mq_hw_sysfs_nr_tags.attr, &blk_mq_hw_sysfs_nr_reserved_tags.attr, |
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&blk_mq_hw_sysfs_cpus.attr, |
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NULL, }; |
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ATTRIBUTE_GROUPS(default_hw_ctx); |
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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, |
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.release = blk_mq_ctx_sysfs_release, |
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}; static struct kobj_type blk_mq_hw_ktype = { .sysfs_ops = &blk_mq_hw_sysfs_ops, |
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.default_groups = default_hw_ctx_groups, |
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.release = blk_mq_hw_sysfs_release, |
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}; |
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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; |
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if (!hctx->nr_ctx) |
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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; |
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if (!hctx->nr_ctx) |
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return 0; |
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ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num); |
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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_dev(struct device *dev, struct request_queue *q) |
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{ |
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struct blk_mq_hw_ctx *hctx; |
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int i; |
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|
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lockdep_assert_held(&q->sysfs_dir_lock); |
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|
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queue_for_each_hw_ctx(q, hctx, i) |
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blk_mq_unregister_hctx(hctx); |
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kobject_uevent(q->mq_kobj, KOBJ_REMOVE); kobject_del(q->mq_kobj); |
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kobject_put(&dev->kobj); |
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q->mq_sysfs_init_done = false; |
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} |
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void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx) { kobject_init(&hctx->kobj, &blk_mq_hw_ktype); } |
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void blk_mq_sysfs_deinit(struct request_queue *q) { struct blk_mq_ctx *ctx; int cpu; for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); kobject_put(&ctx->kobj); } |
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kobject_put(q->mq_kobj); |
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} |
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void blk_mq_sysfs_init(struct request_queue *q) |
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{ |
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struct blk_mq_ctx *ctx; |
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int cpu; |
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|
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kobject_init(q->mq_kobj, &blk_mq_ktype); |
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|
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for_each_possible_cpu(cpu) { ctx = per_cpu_ptr(q->queue_ctx, cpu); |
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kobject_get(q->mq_kobj); |
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kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); |
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} |
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} |
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int __blk_mq_register_dev(struct device *dev, struct request_queue *q) |
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{ |
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struct blk_mq_hw_ctx *hctx; |
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int ret, i; |
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|
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WARN_ON_ONCE(!q->kobj.parent); |
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lockdep_assert_held(&q->sysfs_dir_lock); |
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|
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ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); |
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if (ret < 0) |
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goto out; |
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|
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kobject_uevent(q->mq_kobj, KOBJ_ADD); |
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queue_for_each_hw_ctx(q, hctx, i) { |
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ret = blk_mq_register_hctx(hctx); |
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if (ret) |
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goto unreg; |
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} |
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q->mq_sysfs_init_done = true; |
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|
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out: |
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return ret; |
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unreg: while (--i >= 0) blk_mq_unregister_hctx(q->queue_hw_ctx[i]); |
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kobject_uevent(q->mq_kobj, KOBJ_REMOVE); kobject_del(q->mq_kobj); |
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kobject_put(&dev->kobj); return ret; |
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} |
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void blk_mq_sysfs_unregister(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; |
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mutex_lock(&q->sysfs_dir_lock); |
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if (!q->mq_sysfs_init_done) |
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goto unlock; |
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|
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queue_for_each_hw_ctx(q, hctx, i) blk_mq_unregister_hctx(hctx); |
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unlock: |
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mutex_unlock(&q->sysfs_dir_lock); |
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} int blk_mq_sysfs_register(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i, ret = 0; |
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mutex_lock(&q->sysfs_dir_lock); |
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if (!q->mq_sysfs_init_done) |
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goto unlock; |
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|
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queue_for_each_hw_ctx(q, hctx, i) { ret = blk_mq_register_hctx(hctx); if (ret) break; } |
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unlock: |
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mutex_unlock(&q->sysfs_dir_lock); |
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|
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return ret; } |