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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; } static ssize_t blk_mq_hw_sysfs_ipi_show(struct blk_mq_hw_ctx *hctx, char *page) { ssize_t ret; spin_lock(&hctx->lock); ret = sprintf(page, "%u ", !!(hctx->flags & BLK_MQ_F_SHOULD_IPI)); spin_unlock(&hctx->lock); return ret; } static ssize_t blk_mq_hw_sysfs_ipi_store(struct blk_mq_hw_ctx *hctx, const char *page, size_t len) { struct blk_mq_ctx *ctx; unsigned long ret; unsigned int i; if (kstrtoul(page, 10, &ret)) { pr_err("blk-mq-sysfs: invalid input '%s' ", page); return -EINVAL; } spin_lock(&hctx->lock); if (ret) hctx->flags |= BLK_MQ_F_SHOULD_IPI; else hctx->flags &= ~BLK_MQ_F_SHOULD_IPI; spin_unlock(&hctx->lock); hctx_for_each_ctx(hctx, ctx, i) ctx->ipi_redirect = !!ret; return len; } 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); } 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, }; 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, }; static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_ipi = { .attr = {.name = "ipi_redirect", .mode = S_IRUGO | S_IWUSR}, .show = blk_mq_hw_sysfs_ipi_show, .store = blk_mq_hw_sysfs_ipi_store, }; 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, }; 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, &blk_mq_hw_sysfs_ipi.attr, &blk_mq_hw_sysfs_tags.attr, 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, }; 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) { hctx_for_each_ctx(hctx, ctx, j) { kobject_del(&ctx->kobj); kobject_put(&ctx->kobj); } kobject_del(&hctx->kobj); 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); } 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; struct blk_mq_ctx *ctx; int ret, i, j; kobject_init(&q->mq_kobj, &blk_mq_ktype); 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) { kobject_init(&hctx->kobj, &blk_mq_hw_ktype); ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", i); if (ret) break; if (!hctx->nr_ctx) continue; hctx_for_each_ctx(hctx, ctx, j) { kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); if (ret) break; } } if (ret) { blk_mq_unregister_disk(disk); return ret; } return 0; } |