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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2017 Facebook
- */
- #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"
- #include "blk-rq-qos.h"
- static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
- {
- if (stat->nr_samples) {
- seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
- stat->nr_samples, stat->mean, stat->min, stat->max);
- } else {
- seq_puts(m, "samples=0");
- }
- }
- 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;
- }
- static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
- __acquires(&q->requeue_lock)
- {
- 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);
- }
- static void queue_requeue_list_stop(struct seq_file *m, void *v)
- __releases(&q->requeue_lock)
- {
- 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 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;
- }
- static int queue_pm_only_show(void *data, struct seq_file *m)
- {
- struct request_queue *q = data;
- seq_printf(m, "%d\n", atomic_read(&q->pm_only));
- return 0;
- }
- #define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
- static const char *const blk_queue_flag_name[] = {
- QUEUE_FLAG_NAME(STOPPED),
- QUEUE_FLAG_NAME(DYING),
- QUEUE_FLAG_NAME(NOMERGES),
- QUEUE_FLAG_NAME(SAME_COMP),
- QUEUE_FLAG_NAME(FAIL_IO),
- 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(STABLE_WRITES),
- QUEUE_FLAG_NAME(POLL),
- QUEUE_FLAG_NAME(WC),
- QUEUE_FLAG_NAME(FUA),
- 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),
- QUEUE_FLAG_NAME(PCI_P2PDMA),
- QUEUE_FLAG_NAME(ZONE_RESETALL),
- QUEUE_FLAG_NAME(RQ_ALLOC_TIME),
- QUEUE_FLAG_NAME(HCTX_ACTIVE),
- QUEUE_FLAG_NAME(NOWAIT),
- };
- #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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
- { "poll_stat", 0400, queue_poll_stat_show },
- { "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
- { "pm_only", 0600, queue_pm_only_show, NULL },
- { "state", 0600, queue_state_show, queue_state_write },
- { "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
- { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
- { },
- };
- #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(INACTIVE),
- };
- #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;
- }
- #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_QUEUE_SHARED),
- HCTX_FLAG_NAME(BLOCKING),
- HCTX_FLAG_NAME(NO_SCHED),
- HCTX_FLAG_NAME(STACKING),
- HCTX_FLAG_NAME(TAG_HCTX_SHARED),
- };
- #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;
- }
- #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(NOWAIT),
- CMD_FLAG_NAME(NOUNMAP),
- CMD_FLAG_NAME(HIPRI),
- };
- #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(SOFTBARRIER),
- RQF_NAME(FLUSH_SEQ),
- RQF_NAME(MIXED_MERGE),
- RQF_NAME(MQ_INFLIGHT),
- RQF_NAME(DONTPREP),
- 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),
- RQF_NAME(ZONE_WRITE_LOCKED),
- RQF_NAME(MQ_POLL_SLEPT),
- };
- #undef RQF_NAME
- static const char *const blk_mq_rq_state_name_array[] = {
- [MQ_RQ_IDLE] = "idle",
- [MQ_RQ_IN_FLIGHT] = "in_flight",
- [MQ_RQ_COMPLETE] = "complete",
- };
- static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
- {
- if (WARN_ON_ONCE((unsigned int)rq_state >=
- ARRAY_SIZE(blk_mq_rq_state_name_array)))
- return "(?)";
- return blk_mq_rq_state_name_array[rq_state];
- }
- 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 = req_op(rq);
- const char *op_str = blk_op_str(op);
- seq_printf(m, "%p {.op=", rq);
- if (strcmp(op_str, "UNKNOWN") == 0)
- seq_printf(m, "%u", op);
- else
- seq_printf(m, "%s", op_str);
- 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_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
- 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;
- }
- 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));
- }
- EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
- 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,
- };
- 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. Returns true to
- * keep iterating requests.
- */
- static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
- {
- const struct show_busy_params *params = data;
- if (rq->mq_hctx == params->hctx)
- __blk_mq_debugfs_rq_show(params->m, rq);
- return true;
- }
- 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,
- ¶ms);
- return 0;
- }
- static const char *const hctx_types[] = {
- [HCTX_TYPE_DEFAULT] = "default",
- [HCTX_TYPE_READ] = "read",
- [HCTX_TYPE_POLL] = "poll",
- };
- static int hctx_type_show(void *data, struct seq_file *m)
- {
- struct blk_mq_hw_ctx *hctx = data;
- BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
- seq_printf(m, "%s\n", hctx_types[hctx->type]);
- return 0;
- }
- 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;
- }
- 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(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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- 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;
- }
- static int hctx_run_show(void *data, struct seq_file *m)
- {
- struct blk_mq_hw_ctx *hctx = data;
- seq_printf(m, "%lu\n", hctx->run);
- return 0;
- }
- static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
- loff_t *ppos)
- {
- struct blk_mq_hw_ctx *hctx = data;
- hctx->run = 0;
- return count;
- }
- static int hctx_active_show(void *data, struct seq_file *m)
- {
- struct blk_mq_hw_ctx *hctx = data;
- seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
- return 0;
- }
- static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
- {
- struct blk_mq_hw_ctx *hctx = data;
- seq_printf(m, "%u\n", hctx->dispatch_busy);
- return 0;
- }
- #define CTX_RQ_SEQ_OPS(name, type) \
- static void *ctx_##name##_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_lists[type], *pos); \
- } \
- \
- static void *ctx_##name##_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_lists[type], pos); \
- } \
- \
- static void ctx_##name##_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_##name##_rq_list_seq_ops = { \
- .start = ctx_##name##_rq_list_start, \
- .next = ctx_##name##_rq_list_next, \
- .stop = ctx_##name##_rq_list_stop, \
- .show = blk_mq_debugfs_rq_show, \
- }
- CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
- CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
- CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
- static int ctx_dispatched_show(void *data, struct seq_file *m)
- {
- struct blk_mq_ctx *ctx = data;
- seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
- return 0;
- }
- static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
- size_t count, loff_t *ppos)
- {
- struct blk_mq_ctx *ctx = data;
- ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
- return count;
- }
- static int ctx_merged_show(void *data, struct seq_file *m)
- {
- struct blk_mq_ctx *ctx = data;
- seq_printf(m, "%lu\n", ctx->rq_merged);
- return 0;
- }
- static ssize_t ctx_merged_write(void *data, const char __user *buf,
- size_t count, loff_t *ppos)
- {
- struct blk_mq_ctx *ctx = data;
- ctx->rq_merged = 0;
- return count;
- }
- static int ctx_completed_show(void *data, struct seq_file *m)
- {
- struct blk_mq_ctx *ctx = data;
- seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
- return 0;
- }
- static ssize_t ctx_completed_write(void *data, const char __user *buf,
- size_t count, loff_t *ppos)
- {
- struct blk_mq_ctx *ctx = data;
- ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
- return count;
- }
- static int blk_mq_debugfs_show(struct seq_file *m, void *v)
- {
- const struct blk_mq_debugfs_attr *attr = m->private;
- void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
- return attr->show(data, m);
- }
- static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
- {
- struct seq_file *m = file->private_data;
- const struct blk_mq_debugfs_attr *attr = m->private;
- void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
- /*
- * Attributes that only implement .seq_ops are read-only and 'attr' is
- * the same with 'data' in this case.
- */
- if (attr == data || !attr->write)
- return -EPERM;
- return attr->write(data, buf, count, ppos);
- }
- static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
- {
- const struct blk_mq_debugfs_attr *attr = inode->i_private;
- void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
- struct seq_file *m;
- int ret;
- if (attr->seq_ops) {
- ret = seq_open(file, attr->seq_ops);
- if (!ret) {
- m = file->private_data;
- m->private = data;
- }
- return ret;
- }
- if (WARN_ON_ONCE(!attr->show))
- return -EPERM;
- return single_open(file, blk_mq_debugfs_show, inode->i_private);
- }
- static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
- {
- const struct blk_mq_debugfs_attr *attr = inode->i_private;
- if (attr->show)
- return single_release(inode, file);
- return seq_release(inode, file);
- }
- static const struct file_operations blk_mq_debugfs_fops = {
- .open = blk_mq_debugfs_open,
- .read = seq_read,
- .write = blk_mq_debugfs_write,
- .llseek = seq_lseek,
- .release = blk_mq_debugfs_release,
- };
- static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
- {"state", 0400, hctx_state_show},
- {"flags", 0400, hctx_flags_show},
- {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
- {"busy", 0400, hctx_busy_show},
- {"ctx_map", 0400, hctx_ctx_map_show},
- {"tags", 0400, hctx_tags_show},
- {"tags_bitmap", 0400, hctx_tags_bitmap_show},
- {"sched_tags", 0400, hctx_sched_tags_show},
- {"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
- {"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
- {"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
- {"queued", 0600, hctx_queued_show, hctx_queued_write},
- {"run", 0600, hctx_run_show, hctx_run_write},
- {"active", 0400, hctx_active_show},
- {"dispatch_busy", 0400, hctx_dispatch_busy_show},
- {"type", 0400, hctx_type_show},
- {},
- };
- static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
- {"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
- {"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
- {"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
- {"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
- {"merged", 0600, ctx_merged_show, ctx_merged_write},
- {"completed", 0600, ctx_completed_show, ctx_completed_write},
- {},
- };
- static void debugfs_create_files(struct dentry *parent, void *data,
- const struct blk_mq_debugfs_attr *attr)
- {
- if (IS_ERR_OR_NULL(parent))
- return;
- d_inode(parent)->i_private = data;
- for (; attr->name; attr++)
- debugfs_create_file(attr->name, attr->mode, parent,
- (void *)attr, &blk_mq_debugfs_fops);
- }
- void blk_mq_debugfs_register(struct request_queue *q)
- {
- struct blk_mq_hw_ctx *hctx;
- int i;
- debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
- /*
- * blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
- * didn't exist yet (because we don't know what to name the directory
- * until the queue is registered to a gendisk).
- */
- if (q->elevator && !q->sched_debugfs_dir)
- blk_mq_debugfs_register_sched(q);
- /* Similarly, blk_mq_init_hctx() couldn't do this previously. */
- queue_for_each_hw_ctx(q, hctx, i) {
- if (!hctx->debugfs_dir)
- blk_mq_debugfs_register_hctx(q, hctx);
- if (q->elevator && !hctx->sched_debugfs_dir)
- blk_mq_debugfs_register_sched_hctx(q, hctx);
- }
- if (q->rq_qos) {
- struct rq_qos *rqos = q->rq_qos;
- while (rqos) {
- blk_mq_debugfs_register_rqos(rqos);
- rqos = rqos->next;
- }
- }
- }
- void blk_mq_debugfs_unregister(struct request_queue *q)
- {
- q->sched_debugfs_dir = NULL;
- }
- static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
- struct blk_mq_ctx *ctx)
- {
- struct dentry *ctx_dir;
- char name[20];
- snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
- ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
- debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
- }
- void blk_mq_debugfs_register_hctx(struct request_queue *q,
- struct blk_mq_hw_ctx *hctx)
- {
- struct blk_mq_ctx *ctx;
- char name[20];
- int i;
- snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
- hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
- debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
- hctx_for_each_ctx(hctx, ctx, i)
- blk_mq_debugfs_register_ctx(hctx, ctx);
- }
- void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
- {
- debugfs_remove_recursive(hctx->debugfs_dir);
- hctx->sched_debugfs_dir = NULL;
- hctx->debugfs_dir = NULL;
- }
- void blk_mq_debugfs_register_hctxs(struct request_queue *q)
- {
- struct blk_mq_hw_ctx *hctx;
- int i;
- queue_for_each_hw_ctx(q, hctx, i)
- blk_mq_debugfs_register_hctx(q, hctx);
- }
- void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
- {
- struct blk_mq_hw_ctx *hctx;
- int i;
- queue_for_each_hw_ctx(q, hctx, i)
- blk_mq_debugfs_unregister_hctx(hctx);
- }
- void blk_mq_debugfs_register_sched(struct request_queue *q)
- {
- struct elevator_type *e = q->elevator->type;
- /*
- * If the parent directory has not been created yet, return, we will be
- * called again later on and the directory/files will be created then.
- */
- if (!q->debugfs_dir)
- return;
- if (!e->queue_debugfs_attrs)
- return;
- q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
- debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
- }
- void blk_mq_debugfs_unregister_sched(struct request_queue *q)
- {
- debugfs_remove_recursive(q->sched_debugfs_dir);
- q->sched_debugfs_dir = NULL;
- }
- static const char *rq_qos_id_to_name(enum rq_qos_id id)
- {
- switch (id) {
- case RQ_QOS_WBT:
- return "wbt";
- case RQ_QOS_LATENCY:
- return "latency";
- case RQ_QOS_COST:
- return "cost";
- case RQ_QOS_IOPRIO:
- return "ioprio";
- }
- return "unknown";
- }
- void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
- {
- debugfs_remove_recursive(rqos->debugfs_dir);
- rqos->debugfs_dir = NULL;
- }
- void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
- {
- struct request_queue *q = rqos->q;
- const char *dir_name = rq_qos_id_to_name(rqos->id);
- if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
- return;
- if (!q->rqos_debugfs_dir)
- q->rqos_debugfs_dir = debugfs_create_dir("rqos",
- q->debugfs_dir);
- rqos->debugfs_dir = debugfs_create_dir(dir_name,
- rqos->q->rqos_debugfs_dir);
- debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
- }
- void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
- {
- debugfs_remove_recursive(q->rqos_debugfs_dir);
- q->rqos_debugfs_dir = NULL;
- }
- void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
- struct blk_mq_hw_ctx *hctx)
- {
- struct elevator_type *e = q->elevator->type;
- if (!e->hctx_debugfs_attrs)
- return;
- hctx->sched_debugfs_dir = debugfs_create_dir("sched",
- hctx->debugfs_dir);
- debugfs_create_files(hctx->sched_debugfs_dir, hctx,
- e->hctx_debugfs_attrs);
- }
- void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
- {
- debugfs_remove_recursive(hctx->sched_debugfs_dir);
- hctx->sched_debugfs_dir = NULL;
- }
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