/* * Copyright (C) 2017 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License v2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include "blk-mq.h" #include "blk-mq-tag.h" struct blk_mq_debugfs_attr { const char *name; umode_t mode; const struct file_operations *fops; }; static struct dentry *block_debugfs_root; static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file, const struct seq_operations *ops) { struct seq_file *m; int ret; ret = seq_open(file, ops); if (!ret) { m = file->private_data; m->private = inode->i_private; } return ret; } static int hctx_state_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "0x%lx\n", hctx->state); return 0; } static int hctx_state_open(struct inode *inode, struct file *file) { return single_open(file, hctx_state_show, inode->i_private); } static const struct file_operations hctx_state_fops = { .open = hctx_state_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int hctx_flags_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "0x%lx\n", hctx->flags); return 0; } static int hctx_flags_open(struct inode *inode, struct file *file) { return single_open(file, hctx_flags_show, inode->i_private); } static const struct file_operations hctx_flags_fops = { .open = hctx_flags_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) { struct request *rq = list_entry_rq(v); seq_printf(m, "%p {.cmd_flags=0x%x, .rq_flags=0x%x, .tag=%d, .internal_tag=%d}\n", rq, rq->cmd_flags, (unsigned int)rq->rq_flags, rq->tag, rq->internal_tag); return 0; } static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) __acquires(&hctx->lock) { struct blk_mq_hw_ctx *hctx = m->private; spin_lock(&hctx->lock); return seq_list_start(&hctx->dispatch, *pos); } static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) { struct blk_mq_hw_ctx *hctx = m->private; return seq_list_next(v, &hctx->dispatch, pos); } static void hctx_dispatch_stop(struct seq_file *m, void *v) __releases(&hctx->lock) { struct blk_mq_hw_ctx *hctx = m->private; spin_unlock(&hctx->lock); } static const struct seq_operations hctx_dispatch_seq_ops = { .start = hctx_dispatch_start, .next = hctx_dispatch_next, .stop = hctx_dispatch_stop, .show = blk_mq_debugfs_rq_show, }; static int hctx_dispatch_open(struct inode *inode, struct file *file) { return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops); } static const struct file_operations hctx_dispatch_fops = { .open = hctx_dispatch_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static int hctx_ctx_map_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; sbitmap_bitmap_show(&hctx->ctx_map, m); return 0; } static int hctx_ctx_map_open(struct inode *inode, struct file *file) { return single_open(file, hctx_ctx_map_show, inode->i_private); } static const struct file_operations hctx_ctx_map_fops = { .open = hctx_ctx_map_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void blk_mq_debugfs_tags_show(struct seq_file *m, struct blk_mq_tags *tags) { seq_printf(m, "nr_tags=%u\n", tags->nr_tags); seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags); seq_printf(m, "active_queues=%d\n", atomic_read(&tags->active_queues)); seq_puts(m, "\nbitmap_tags:\n"); sbitmap_queue_show(&tags->bitmap_tags, m); if (tags->nr_reserved_tags) { seq_puts(m, "\nbreserved_tags:\n"); sbitmap_queue_show(&tags->breserved_tags, m); } } static int hctx_tags_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; mutex_lock(&q->sysfs_lock); if (hctx->tags) blk_mq_debugfs_tags_show(m, hctx->tags); mutex_unlock(&q->sysfs_lock); return 0; } static int hctx_tags_open(struct inode *inode, struct file *file) { return single_open(file, hctx_tags_show, inode->i_private); } static const struct file_operations hctx_tags_fops = { .open = hctx_tags_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int hctx_tags_bitmap_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; mutex_lock(&q->sysfs_lock); if (hctx->tags) sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); return 0; } static int hctx_tags_bitmap_open(struct inode *inode, struct file *file) { return single_open(file, hctx_tags_bitmap_show, inode->i_private); } static const struct file_operations hctx_tags_bitmap_fops = { .open = hctx_tags_bitmap_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int hctx_sched_tags_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; mutex_lock(&q->sysfs_lock); if (hctx->sched_tags) blk_mq_debugfs_tags_show(m, hctx->sched_tags); mutex_unlock(&q->sysfs_lock); return 0; } static int hctx_sched_tags_open(struct inode *inode, struct file *file) { return single_open(file, hctx_sched_tags_show, inode->i_private); } static const struct file_operations hctx_sched_tags_fops = { .open = hctx_sched_tags_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct request_queue *q = hctx->queue; mutex_lock(&q->sysfs_lock); if (hctx->sched_tags) sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); return 0; } static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file) { return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private); } static const struct file_operations hctx_sched_tags_bitmap_fops = { .open = hctx_sched_tags_bitmap_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int hctx_io_poll_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "considered=%lu\n", hctx->poll_considered); seq_printf(m, "invoked=%lu\n", hctx->poll_invoked); seq_printf(m, "success=%lu\n", hctx->poll_success); return 0; } static int hctx_io_poll_open(struct inode *inode, struct file *file) { return single_open(file, hctx_io_poll_show, inode->i_private); } static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_hw_ctx *hctx = m->private; hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; return count; } static const struct file_operations hctx_io_poll_fops = { .open = hctx_io_poll_open, .read = seq_read, .write = hctx_io_poll_write, .llseek = seq_lseek, .release = single_release, }; static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) { seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", stat->nr_samples, stat->mean, stat->min, stat->max); } static int hctx_stats_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; struct blk_rq_stat stat[2]; blk_stat_init(&stat[BLK_STAT_READ]); blk_stat_init(&stat[BLK_STAT_WRITE]); blk_hctx_stat_get(hctx, stat); seq_puts(m, "read: "); print_stat(m, &stat[BLK_STAT_READ]); seq_puts(m, "\n"); seq_puts(m, "write: "); print_stat(m, &stat[BLK_STAT_WRITE]); seq_puts(m, "\n"); return 0; } static int hctx_stats_open(struct inode *inode, struct file *file) { return single_open(file, hctx_stats_show, inode->i_private); } static ssize_t hctx_stats_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_hw_ctx *hctx = m->private; struct blk_mq_ctx *ctx; int i; hctx_for_each_ctx(hctx, ctx, i) { blk_stat_init(&ctx->stat[BLK_STAT_READ]); blk_stat_init(&ctx->stat[BLK_STAT_WRITE]); } return count; } static const struct file_operations hctx_stats_fops = { .open = hctx_stats_open, .read = seq_read, .write = hctx_stats_write, .llseek = seq_lseek, .release = single_release, }; static int hctx_dispatched_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; int i; seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]); for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) { unsigned int d = 1U << (i - 1); seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]); } seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]); return 0; } static int hctx_dispatched_open(struct inode *inode, struct file *file) { return single_open(file, hctx_dispatched_show, inode->i_private); } static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_hw_ctx *hctx = m->private; int i; for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) hctx->dispatched[i] = 0; return count; } static const struct file_operations hctx_dispatched_fops = { .open = hctx_dispatched_open, .read = seq_read, .write = hctx_dispatched_write, .llseek = seq_lseek, .release = single_release, }; static int hctx_queued_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "%lu\n", hctx->queued); return 0; } static int hctx_queued_open(struct inode *inode, struct file *file) { return single_open(file, hctx_queued_show, inode->i_private); } static ssize_t hctx_queued_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_hw_ctx *hctx = m->private; hctx->queued = 0; return count; } static const struct file_operations hctx_queued_fops = { .open = hctx_queued_open, .read = seq_read, .write = hctx_queued_write, .llseek = seq_lseek, .release = single_release, }; static int hctx_run_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "%lu\n", hctx->run); return 0; } static int hctx_run_open(struct inode *inode, struct file *file) { return single_open(file, hctx_run_show, inode->i_private); } static ssize_t hctx_run_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_hw_ctx *hctx = m->private; hctx->run = 0; return count; } static const struct file_operations hctx_run_fops = { .open = hctx_run_open, .read = seq_read, .write = hctx_run_write, .llseek = seq_lseek, .release = single_release, }; static int hctx_active_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; seq_printf(m, "%d\n", atomic_read(&hctx->nr_active)); return 0; } static int hctx_active_open(struct inode *inode, struct file *file) { return single_open(file, hctx_active_show, inode->i_private); } static const struct file_operations hctx_active_fops = { .open = hctx_active_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) __acquires(&ctx->lock) { struct blk_mq_ctx *ctx = m->private; spin_lock(&ctx->lock); return seq_list_start(&ctx->rq_list, *pos); } static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) { struct blk_mq_ctx *ctx = m->private; return seq_list_next(v, &ctx->rq_list, pos); } static void ctx_rq_list_stop(struct seq_file *m, void *v) __releases(&ctx->lock) { struct blk_mq_ctx *ctx = m->private; spin_unlock(&ctx->lock); } static const struct seq_operations ctx_rq_list_seq_ops = { .start = ctx_rq_list_start, .next = ctx_rq_list_next, .stop = ctx_rq_list_stop, .show = blk_mq_debugfs_rq_show, }; static int ctx_rq_list_open(struct inode *inode, struct file *file) { return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops); } static const struct file_operations ctx_rq_list_fops = { .open = ctx_rq_list_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release, }; static int ctx_dispatched_show(struct seq_file *m, void *v) { struct blk_mq_ctx *ctx = m->private; seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]); return 0; } static int ctx_dispatched_open(struct inode *inode, struct file *file) { return single_open(file, ctx_dispatched_show, inode->i_private); } static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_ctx *ctx = m->private; ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0; return count; } static const struct file_operations ctx_dispatched_fops = { .open = ctx_dispatched_open, .read = seq_read, .write = ctx_dispatched_write, .llseek = seq_lseek, .release = single_release, }; static int ctx_merged_show(struct seq_file *m, void *v) { struct blk_mq_ctx *ctx = m->private; seq_printf(m, "%lu\n", ctx->rq_merged); return 0; } static int ctx_merged_open(struct inode *inode, struct file *file) { return single_open(file, ctx_merged_show, inode->i_private); } static ssize_t ctx_merged_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_ctx *ctx = m->private; ctx->rq_merged = 0; return count; } static const struct file_operations ctx_merged_fops = { .open = ctx_merged_open, .read = seq_read, .write = ctx_merged_write, .llseek = seq_lseek, .release = single_release, }; static int ctx_completed_show(struct seq_file *m, void *v) { struct blk_mq_ctx *ctx = m->private; seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]); return 0; } static int ctx_completed_open(struct inode *inode, struct file *file) { return single_open(file, ctx_completed_show, inode->i_private); } static ssize_t ctx_completed_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct seq_file *m = file->private_data; struct blk_mq_ctx *ctx = m->private; ctx->rq_completed[0] = ctx->rq_completed[1] = 0; return count; } static const struct file_operations ctx_completed_fops = { .open = ctx_completed_open, .read = seq_read, .write = ctx_completed_write, .llseek = seq_lseek, .release = single_release, }; static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = { {"state", 0400, &hctx_state_fops}, {"flags", 0400, &hctx_flags_fops}, {"dispatch", 0400, &hctx_dispatch_fops}, {"ctx_map", 0400, &hctx_ctx_map_fops}, {"tags", 0400, &hctx_tags_fops}, {"tags_bitmap", 0400, &hctx_tags_bitmap_fops}, {"sched_tags", 0400, &hctx_sched_tags_fops}, {"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops}, {"io_poll", 0600, &hctx_io_poll_fops}, {"stats", 0600, &hctx_stats_fops}, {"dispatched", 0600, &hctx_dispatched_fops}, {"queued", 0600, &hctx_queued_fops}, {"run", 0600, &hctx_run_fops}, {"active", 0400, &hctx_active_fops}, }; static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { {"rq_list", 0400, &ctx_rq_list_fops}, {"dispatched", 0600, &ctx_dispatched_fops}, {"merged", 0600, &ctx_merged_fops}, {"completed", 0600, &ctx_completed_fops}, }; int blk_mq_debugfs_register(struct request_queue *q, const char *name) { if (!block_debugfs_root) return -ENOENT; q->debugfs_dir = debugfs_create_dir(name, block_debugfs_root); if (!q->debugfs_dir) goto err; if (blk_mq_debugfs_register_hctxs(q)) goto err; return 0; err: blk_mq_debugfs_unregister(q); return -ENOMEM; } void blk_mq_debugfs_unregister(struct request_queue *q) { debugfs_remove_recursive(q->debugfs_dir); q->mq_debugfs_dir = NULL; q->debugfs_dir = NULL; } static int blk_mq_debugfs_register_ctx(struct request_queue *q, struct blk_mq_ctx *ctx, struct dentry *hctx_dir) { struct dentry *ctx_dir; char name[20]; int i; snprintf(name, sizeof(name), "cpu%u", ctx->cpu); ctx_dir = debugfs_create_dir(name, hctx_dir); if (!ctx_dir) return -ENOMEM; for (i = 0; i < ARRAY_SIZE(blk_mq_debugfs_ctx_attrs); i++) { const struct blk_mq_debugfs_attr *attr; attr = &blk_mq_debugfs_ctx_attrs[i]; if (!debugfs_create_file(attr->name, attr->mode, ctx_dir, ctx, attr->fops)) return -ENOMEM; } return 0; } static int blk_mq_debugfs_register_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx) { struct blk_mq_ctx *ctx; struct dentry *hctx_dir; char name[20]; int i; snprintf(name, sizeof(name), "%u", hctx->queue_num); hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir); if (!hctx_dir) return -ENOMEM; for (i = 0; i < ARRAY_SIZE(blk_mq_debugfs_hctx_attrs); i++) { const struct blk_mq_debugfs_attr *attr; attr = &blk_mq_debugfs_hctx_attrs[i]; if (!debugfs_create_file(attr->name, attr->mode, hctx_dir, hctx, attr->fops)) return -ENOMEM; } hctx_for_each_ctx(hctx, ctx, i) { if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir)) return -ENOMEM; } return 0; } int blk_mq_debugfs_register_hctxs(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; if (!q->debugfs_dir) return -ENOENT; q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir); if (!q->mq_debugfs_dir) goto err; queue_for_each_hw_ctx(q, hctx, i) { if (blk_mq_debugfs_register_hctx(q, hctx)) goto err; } return 0; err: blk_mq_debugfs_unregister_hctxs(q); return -ENOMEM; } void blk_mq_debugfs_unregister_hctxs(struct request_queue *q) { debugfs_remove_recursive(q->mq_debugfs_dir); q->mq_debugfs_dir = NULL; } void blk_mq_debugfs_init(void) { block_debugfs_root = debugfs_create_dir("block", NULL); }