cregit-Linux how code gets into the kernel

Release 4.14 block/blk-mq-debugfs.c

Directory: block
/*
 * 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 <https://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/debugfs.h>

#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
#include "blk-mq-debugfs.h"
#include "blk-mq-tag.h"


static int blk_flags_show(struct seq_file *m, const unsigned long flags, const char *const *flag_name, int flag_name_count) { bool sep = false; int i; for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) { if (!(flags & BIT(i))) continue; if (sep) seq_puts(m, "|"); sep = true; if (i < flag_name_count && flag_name[i]) seq_puts(m, flag_name[i]); else seq_printf(m, "%d", i); } return 0; }

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#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(QUEUED), QUEUE_FLAG_NAME(STOPPED), QUEUE_FLAG_NAME(DYING), QUEUE_FLAG_NAME(BYPASS), QUEUE_FLAG_NAME(BIDI), QUEUE_FLAG_NAME(NOMERGES), QUEUE_FLAG_NAME(SAME_COMP), QUEUE_FLAG_NAME(FAIL_IO), QUEUE_FLAG_NAME(STACKABLE), QUEUE_FLAG_NAME(NONROT), QUEUE_FLAG_NAME(IO_STAT), QUEUE_FLAG_NAME(DISCARD), QUEUE_FLAG_NAME(NOXMERGES), QUEUE_FLAG_NAME(ADD_RANDOM), QUEUE_FLAG_NAME(SECERASE), QUEUE_FLAG_NAME(SAME_FORCE), QUEUE_FLAG_NAME(DEAD), QUEUE_FLAG_NAME(INIT_DONE), QUEUE_FLAG_NAME(NO_SG_MERGE), QUEUE_FLAG_NAME(POLL), QUEUE_FLAG_NAME(WC), QUEUE_FLAG_NAME(FUA), QUEUE_FLAG_NAME(FLUSH_NQ), QUEUE_FLAG_NAME(DAX), QUEUE_FLAG_NAME(STATS), QUEUE_FLAG_NAME(POLL_STATS), QUEUE_FLAG_NAME(REGISTERED), QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), QUEUE_FLAG_NAME(QUIESCED), }; #undef QUEUE_FLAG_NAME
static int queue_state_show(void *data, struct seq_file *m) { struct request_queue *q = data; blk_flags_show(m, q->queue_flags, blk_queue_flag_name, ARRAY_SIZE(blk_queue_flag_name)); seq_puts(m, "\n"); return 0; }

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static ssize_t queue_state_write(void *data, const char __user *buf, size_t count, loff_t *ppos) { struct request_queue *q = data; char opbuf[16] = { }, *op; /* * The "state" attribute is removed after blk_cleanup_queue() has called * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid * triggering a use-after-free. */ if (blk_queue_dead(q)) return -ENOENT; if (count >= sizeof(opbuf)) { pr_err("%s: operation too long\n", __func__); goto inval; } if (copy_from_user(opbuf, buf, count)) return -EFAULT; op = strstrip(opbuf); if (strcmp(op, "run") == 0) { blk_mq_run_hw_queues(q, true); } else if (strcmp(op, "start") == 0) { blk_mq_start_stopped_hw_queues(q, true); } else if (strcmp(op, "kick") == 0) { blk_mq_kick_requeue_list(q); } else { pr_err("%s: unsupported operation '%s'\n", __func__, op); inval: pr_err("%s: use 'run', 'start' or 'kick'\n", __func__); return -EINVAL; } return count; }

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static void print_stat(struct seq_file *m, struct blk_rq_stat *stat) { if (stat->nr_samples) { seq_printf(m, "samples=%d, mean=%lld, min=%llu, max=%llu", stat->nr_samples, stat->mean, stat->min, stat->max); } else { seq_puts(m, "samples=0"); } }

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static int queue_write_hint_show(void *data, struct seq_file *m) { struct request_queue *q = data; int i; for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]); return 0; }

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static ssize_t queue_write_hint_store(void *data, const char __user *buf, size_t count, loff_t *ppos) { struct request_queue *q = data; int i; for (i = 0; i < BLK_MAX_WRITE_HINTS; i++) q->write_hints[i] = 0; return count; }

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static int queue_poll_stat_show(void *data, struct seq_file *m) { struct request_queue *q = data; int bucket; for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) { seq_printf(m, "read (%d Bytes): ", 1 << (9+bucket)); print_stat(m, &q->poll_stat[2*bucket]); seq_puts(m, "\n"); seq_printf(m, "write (%d Bytes): ", 1 << (9+bucket)); print_stat(m, &q->poll_stat[2*bucket+1]); seq_puts(m, "\n"); } return 0; }

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#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name static const char *const hctx_state_name[] = { HCTX_STATE_NAME(STOPPED), HCTX_STATE_NAME(TAG_ACTIVE), HCTX_STATE_NAME(SCHED_RESTART), HCTX_STATE_NAME(TAG_WAITING), HCTX_STATE_NAME(START_ON_RUN), }; #undef HCTX_STATE_NAME
static int hctx_state_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; blk_flags_show(m, hctx->state, hctx_state_name, ARRAY_SIZE(hctx_state_name)); seq_puts(m, "\n"); return 0; }

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#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name static const char *const alloc_policy_name[] = { BLK_TAG_ALLOC_NAME(FIFO), BLK_TAG_ALLOC_NAME(RR), }; #undef BLK_TAG_ALLOC_NAME #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name static const char *const hctx_flag_name[] = { HCTX_FLAG_NAME(SHOULD_MERGE), HCTX_FLAG_NAME(TAG_SHARED), HCTX_FLAG_NAME(SG_MERGE), HCTX_FLAG_NAME(BLOCKING), HCTX_FLAG_NAME(NO_SCHED), }; #undef HCTX_FLAG_NAME
static int hctx_flags_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags); seq_puts(m, "alloc_policy="); if (alloc_policy < ARRAY_SIZE(alloc_policy_name) && alloc_policy_name[alloc_policy]) seq_puts(m, alloc_policy_name[alloc_policy]); else seq_printf(m, "%d", alloc_policy); seq_puts(m, " "); blk_flags_show(m, hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy), hctx_flag_name, ARRAY_SIZE(hctx_flag_name)); seq_puts(m, "\n"); return 0; }

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#define REQ_OP_NAME(name) [REQ_OP_##name] = #name static const char *const op_name[] = { REQ_OP_NAME(READ), REQ_OP_NAME(WRITE), REQ_OP_NAME(FLUSH), REQ_OP_NAME(DISCARD), REQ_OP_NAME(ZONE_REPORT), REQ_OP_NAME(SECURE_ERASE), REQ_OP_NAME(ZONE_RESET), REQ_OP_NAME(WRITE_SAME), REQ_OP_NAME(WRITE_ZEROES), REQ_OP_NAME(SCSI_IN), REQ_OP_NAME(SCSI_OUT), REQ_OP_NAME(DRV_IN), REQ_OP_NAME(DRV_OUT), }; #undef REQ_OP_NAME #define CMD_FLAG_NAME(name) [__REQ_##name] = #name static const char *const cmd_flag_name[] = { CMD_FLAG_NAME(FAILFAST_DEV), CMD_FLAG_NAME(FAILFAST_TRANSPORT), CMD_FLAG_NAME(FAILFAST_DRIVER), CMD_FLAG_NAME(SYNC), CMD_FLAG_NAME(META), CMD_FLAG_NAME(PRIO), CMD_FLAG_NAME(NOMERGE), CMD_FLAG_NAME(IDLE), CMD_FLAG_NAME(INTEGRITY), CMD_FLAG_NAME(FUA), CMD_FLAG_NAME(PREFLUSH), CMD_FLAG_NAME(RAHEAD), CMD_FLAG_NAME(BACKGROUND), CMD_FLAG_NAME(NOUNMAP), CMD_FLAG_NAME(NOWAIT), }; #undef CMD_FLAG_NAME #define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name static const char *const rqf_name[] = { RQF_NAME(SORTED), RQF_NAME(STARTED), RQF_NAME(QUEUED), RQF_NAME(SOFTBARRIER), RQF_NAME(FLUSH_SEQ), RQF_NAME(MIXED_MERGE), RQF_NAME(MQ_INFLIGHT), RQF_NAME(DONTPREP), RQF_NAME(PREEMPT), RQF_NAME(COPY_USER), RQF_NAME(FAILED), RQF_NAME(QUIET), RQF_NAME(ELVPRIV), RQF_NAME(IO_STAT), RQF_NAME(ALLOCED), RQF_NAME(PM), RQF_NAME(HASHED), RQF_NAME(STATS), RQF_NAME(SPECIAL_PAYLOAD), }; #undef RQF_NAME #define RQAF_NAME(name) [REQ_ATOM_##name] = #name static const char *const rqaf_name[] = { RQAF_NAME(COMPLETE), RQAF_NAME(STARTED), RQAF_NAME(POLL_SLEPT), }; #undef RQAF_NAME
int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq) { const struct blk_mq_ops *const mq_ops = rq->q->mq_ops; const unsigned int op = rq->cmd_flags & REQ_OP_MASK; seq_printf(m, "%p {.op=", rq); if (op < ARRAY_SIZE(op_name) && op_name[op]) seq_printf(m, "%s", op_name[op]); else seq_printf(m, "%d", op); seq_puts(m, ", .cmd_flags="); blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name, ARRAY_SIZE(cmd_flag_name)); seq_puts(m, ", .rq_flags="); blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name, ARRAY_SIZE(rqf_name)); seq_puts(m, ", .atomic_flags="); blk_flags_show(m, rq->atomic_flags, rqaf_name, ARRAY_SIZE(rqaf_name)); seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag, rq->internal_tag); if (mq_ops->show_rq) mq_ops->show_rq(m, rq); seq_puts(m, "}\n"); return 0; }

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EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) { return __blk_mq_debugfs_rq_show(m, list_entry_rq(v)); }

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EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos) __acquires(&q->requeue_lock

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) { struct request_queue *q = m->private; spin_lock_irq(&q->requeue_lock); return seq_list_start(&q->requeue_list, *pos); }
static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos) { struct request_queue *q = m->private; return seq_list_next(v, &q->requeue_list, pos); }

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static void queue_requeue_list_stop(struct seq_file *m, void *v) __releases(&q->requeue_lock

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) { struct request_queue *q = m->private; spin_unlock_irq(&q->requeue_lock); } static const struct seq_operations queue_requeue_list_seq_ops = { .start = queue_requeue_list_start, .next = queue_requeue_list_next, .stop = queue_requeue_list_stop, .show = blk_mq_debugfs_rq_show, };
static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) __acquires(&hctx->lock

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) { 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); }

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static void hctx_dispatch_stop(struct seq_file *m, void *v) __releases(&hctx->lock

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) { 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, }; struct show_busy_params { struct seq_file *m; struct blk_mq_hw_ctx *hctx; }; /* * Note: the state of a request may change while this function is in progress, * e.g. due to a concurrent blk_mq_finish_request() call. */
static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved) { const struct show_busy_params *params = data; if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx && test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) __blk_mq_debugfs_rq_show(params->m, list_entry_rq(&rq->queuelist)); }

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static int hctx_busy_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; struct show_busy_params params = { .m = m, .hctx = hctx }; blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq, &params); return 0; }

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static int hctx_ctx_map_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; sbitmap_bitmap_show(&hctx->ctx_map, m); return 0; }

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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); } }

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static int hctx_tags_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; struct request_queue *q = hctx->queue; int res; res = mutex_lock_interruptible(&q->sysfs_lock); if (res) goto out; if (hctx->tags) blk_mq_debugfs_tags_show(m, hctx->tags); mutex_unlock(&q->sysfs_lock); out: return res; }

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static int hctx_tags_bitmap_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; struct request_queue *q = hctx->queue; int res; res = mutex_lock_interruptible(&q->sysfs_lock); if (res) goto out; if (hctx->tags) sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); out: return res; }

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static int hctx_sched_tags_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; struct request_queue *q = hctx->queue; int res; res = mutex_lock_interruptible(&q->sysfs_lock); if (res) goto out; if (hctx->sched_tags) blk_mq_debugfs_tags_show(m, hctx->sched_tags); mutex_unlock(&q->sysfs_lock); out: return res; }

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static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; struct request_queue *q = hctx->queue; int res; res = mutex_lock_interruptible(&q->sysfs_lock); if (res) goto out; if (hctx->sched_tags) sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m); mutex_unlock(&q->sysfs_lock); out: return res; }

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static int hctx_io_poll_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; 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; }

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static ssize_t hctx_io_poll_write(void *data, const char __user *buf, size_t count, loff_t *ppos) { struct blk_mq_hw_ctx *hctx = data; hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0; return count; }

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static int hctx_dispatched_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; 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; }

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static ssize_t hctx_dispatched_write(void *data, const char __user *buf, size_t count, loff_t *ppos) { struct blk_mq_hw_ctx *hctx = data; int i; for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) hctx->dispatched[i] = 0; return count; }

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static int hctx_queued_show(void *data, struct seq_file *m) { struct blk_mq_hw_ctx *hctx = data; seq_printf(m, "%lu\n", hctx->queued); return 0; }

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static ssize_t hctx_queued_write(void *data, const char __user *buf, size_t count, loff_t *ppos) { struct blk_mq_hw_ctx *hctx = data; hctx->queued = 0; return count; }

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static int hctx_run_show(void *