// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2017 Facebook */ #include <linux/kernel.h>#include <linux/blkdev.h>#include <linux/build_bug.h>#include <linux/debugfs.h> #include "blk.h"#include "blk-mq.h"#include "blk-mq-debugfs.h"#include "blk-mq-sched.h"#include "blk-rq-qos.h" static int queue_poll_stat_show(void *data, struct seq_file *m){	return 0;} #define TO_REQUEST_QUEUE(m) ((struct request_queue *)m->private) static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)	__acquires(&TO_REQUEST_QUEUE(m)->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(&TO_REQUEST_QUEUE(m)->requeue_lock){	struct request_queue *q = m->private; 	spin_unlock_irq(&q->requeue_lock);} #undef TO_REQUEST_QUEUE 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] = #namestatic const char *const blk_queue_flag_name[] = {	QUEUE_FLAG_NAME(DYING),	QUEUE_FLAG_NAME(NOMERGES),	QUEUE_FLAG_NAME(SAME_COMP),	QUEUE_FLAG_NAME(FAIL_IO),	QUEUE_FLAG_NAME(NOXMERGES),	QUEUE_FLAG_NAME(SAME_FORCE),	QUEUE_FLAG_NAME(INIT_DONE),	QUEUE_FLAG_NAME(STATS),	QUEUE_FLAG_NAME(REGISTERED),	QUEUE_FLAG_NAME(QUIESCED),	QUEUE_FLAG_NAME(RQ_ALLOC_TIME),	QUEUE_FLAG_NAME(HCTX_ACTIVE),	QUEUE_FLAG_NAME(SQ_SCHED),	QUEUE_FLAG_NAME(DISABLE_WBT_DEF),	QUEUE_FLAG_NAME(NO_ELV_SWITCH),	QUEUE_FLAG_NAME(QOS_ENABLED),	QUEUE_FLAG_NAME(BIO_ISSUE_TIME),	QUEUE_FLAG_NAME(ZONED_QD1_WRITES),};#undef QUEUE_FLAG_NAME static int queue_state_show(void *data, struct seq_file *m){	struct request_queue *q = data; 	BUILD_BUG_ON(ARRAY_SIZE(blk_queue_flag_name) != QUEUE_FLAG_MAX);	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 when the queue is removed.  Don't	 * allow setting the state on a dying queue to avoid a use-after-free.	 */	if (blk_queue_dying(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 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 },	{ "zone_wplugs", 0400, queue_zone_wplugs_show, NULL },	{ },}; #define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #namestatic 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; 	BUILD_BUG_ON(ARRAY_SIZE(hctx_state_name) != BLK_MQ_S_MAX);	blk_flags_show(m, hctx->state, hctx_state_name,		       ARRAY_SIZE(hctx_state_name));	seq_puts(m, "\n");	return 0;} #define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #namestatic const char *const hctx_flag_name[] = {	HCTX_FLAG_NAME(TAG_QUEUE_SHARED),	HCTX_FLAG_NAME(STACKING),	HCTX_FLAG_NAME(TAG_HCTX_SHARED),	HCTX_FLAG_NAME(BLOCKING),	HCTX_FLAG_NAME(TAG_RR),	HCTX_FLAG_NAME(NO_SCHED_BY_DEFAULT),};#undef HCTX_FLAG_NAME static int hctx_flags_show(void *data, struct seq_file *m){	struct blk_mq_hw_ctx *hctx = data; 	BUILD_BUG_ON(ARRAY_SIZE(hctx_flag_name) != ilog2(BLK_MQ_F_MAX)); 	blk_flags_show(m, hctx->flags, hctx_flag_name,			ARRAY_SIZE(hctx_flag_name));	seq_puts(m, "\n");	return 0;} #define CMD_FLAG_NAME(name) [__REQ_##name] = #namestatic 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(POLLED),	CMD_FLAG_NAME(ALLOC_CACHE),	CMD_FLAG_NAME(SWAP),	CMD_FLAG_NAME(DRV),	CMD_FLAG_NAME(FS_PRIVATE),	CMD_FLAG_NAME(ATOMIC),	CMD_FLAG_NAME(NOUNMAP),};#undef CMD_FLAG_NAME #define RQF_NAME(name) [__RQF_##name] = #namestatic const char *const rqf_name[] = {	RQF_NAME(STARTED),	RQF_NAME(FLUSH_SEQ),	RQF_NAME(MIXED_MERGE),	RQF_NAME(DONTPREP),	RQF_NAME(SCHED_TAGS),	RQF_NAME(USE_SCHED),	RQF_NAME(FAILED),	RQF_NAME(QUIET),	RQF_NAME(IO_STAT),	RQF_NAME(PM),	RQF_NAME(HASHED),	RQF_NAME(STATS),	RQF_NAME(SPECIAL_PAYLOAD),	RQF_NAME(ZONE_WRITE_PLUGGING),	RQF_NAME(TIMED_OUT),	RQF_NAME(RESV),};#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 enum req_op op = req_op(rq);	const char *op_str = blk_op_str(op); 	BUILD_BUG_ON(ARRAY_SIZE(cmd_flag_name) != __REQ_NR_BITS);	BUILD_BUG_ON(ARRAY_SIZE(rqf_name) != __RQF_BITS); 	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, (__force unsigned int)(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); #define TO_HCTX(m) ((struct blk_mq_hw_ctx *)m->private) static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)	__acquires(&TO_HCTX(m)->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(&TO_HCTX(m)->lock){	struct blk_mq_hw_ctx *hctx = m->private; 	spin_unlock(&hctx->lock);} #undef TO_HCTX 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){	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 };	int res; 	res = mutex_lock_interruptible(&hctx->queue->elevator_lock);	if (res)		return res;	blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,				&params);	mutex_unlock(&hctx->queue->elevator_lock); 	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",		   READ_ONCE(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->elevator_lock);	if (res)		return res;	if (hctx->tags)		blk_mq_debugfs_tags_show(m, hctx->tags);	mutex_unlock(&q->elevator_lock); 	return 0;} 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->elevator_lock);	if (res)		return res;	if (hctx->tags)		sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);	mutex_unlock(&q->elevator_lock); 	return 0;} 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->elevator_lock);	if (res)		return res;	if (hctx->sched_tags)		blk_mq_debugfs_tags_show(m, hctx->sched_tags);	mutex_unlock(&q->elevator_lock); 	return 0;} 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->elevator_lock);	if (res)		return res;	if (hctx->sched_tags)		sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);	mutex_unlock(&q->elevator_lock); 	return 0;} static int hctx_active_show(void *data, struct seq_file *m){	struct blk_mq_hw_ctx *hctx = data; 	seq_printf(m, "%d\n", __blk_mq_active_requests(hctx));	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 TO_CTX(m) ((struct blk_mq_ctx *)m->private) #define CTX_RQ_SEQ_OPS(name, type)					\static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \	__acquires(&TO_CTX(m)->lock)					\{									\

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