[linux-2.6-block.git] / kernel / rcu / tree_trace.c

/*
 * Read-Copy Update tracing for hierarchical implementation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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, you can access it online at
 * http://www.gnu.org/licenses/gpl-2.0.html.
 *
 * Copyright IBM Corporation, 2008
 * Author: Paul E. McKenney
 *
 * Papers:  http://www.rdrop.com/users/paulmck/RCU
 *
 * For detailed explanation of Read-Copy Update mechanism see -
 *		Documentation/RCU
 *
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
#include <linux/rcupdate.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/atomic.h>
#include <linux/bitops.h>
#include <linux/completion.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/mutex.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#define RCU_TREE_NONCORE
#include "tree.h"

DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, rcu_qs_ctr);

static int r_open(struct inode *inode, struct file *file,
					const struct seq_operations *op)
{
	int ret = seq_open(file, op);
	if (!ret) {
		struct seq_file *m = (struct seq_file *)file->private_data;
		m->private = inode->i_private;
	}
	return ret;
}

static void *r_start(struct seq_file *m, loff_t *pos)
{
	struct rcu_state *rsp = (struct rcu_state *)m->private;
	*pos = cpumask_next(*pos - 1, cpu_possible_mask);
	if ((*pos) < nr_cpu_ids)
		return per_cpu_ptr(rsp->rda, *pos);
	return NULL;
}

static void *r_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return r_start(m, pos);
}

static void r_stop(struct seq_file *m, void *v)
{
}

static int show_rcubarrier(struct seq_file *m, void *v)
{
	struct rcu_state *rsp = (struct rcu_state *)m->private;
	seq_printf(m, "bcc: %d bseq: %lu\n",
		   atomic_read(&rsp->barrier_cpu_count),
		   rsp->barrier_sequence);
	return 0;
}

static int rcubarrier_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcubarrier, inode->i_private);
}

static const struct file_operations rcubarrier_fops = {
	.owner = THIS_MODULE,
	.open = rcubarrier_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = single_release,
};

#ifdef CONFIG_RCU_BOOST

static char convert_kthread_status(unsigned int kthread_status)
{
	if (kthread_status > RCU_KTHREAD_MAX)
		return '?';
	return "SRWOY"[kthread_status];
}

#endif /* #ifdef CONFIG_RCU_BOOST */

static void print_one_rcu_data(struct seq_file *m, struct rcu_data *rdp)
{
	long ql, qll;

	if (!rdp->beenonline)
		return;
	seq_printf(m, "%3d%cc=%ld g=%ld cnq=%d/%d:%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   ulong2long(rdp->completed), ulong2long(rdp->gpnum),
		   rdp->cpu_no_qs.b.norm,
		   rdp->rcu_qs_ctr_snap == per_cpu(rcu_qs_ctr, rdp->cpu),
		   rdp->core_needs_qs);
	seq_printf(m, " dt=%d/%llx/%d df=%lu",
		   atomic_read(&rdp->dynticks->dynticks),
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi_nesting,
		   rdp->dynticks_fqs);
	seq_printf(m, " of=%lu", rdp->offline_fqs);
	rcu_nocb_q_lengths(rdp, &ql, &qll);
	qll += rdp->qlen_lazy;
	ql += rdp->qlen;
	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
		   qll, ql,
		   ".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
			rdp->nxttail[RCU_NEXT_TAIL]],
		   ".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
			rdp->nxttail[RCU_NEXT_READY_TAIL]],
		   ".W"[rdp->nxttail[RCU_DONE_TAIL] !=
			rdp->nxttail[RCU_WAIT_TAIL]],
		   ".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
#ifdef CONFIG_RCU_BOOST
	seq_printf(m, " kt=%d/%c ktl=%x",
		   per_cpu(rcu_cpu_has_work, rdp->cpu),
		   convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
					  rdp->cpu)),
		   per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
#endif /* #ifdef CONFIG_RCU_BOOST */
	seq_printf(m, " b=%ld", rdp->blimit);
	seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n",
		   rdp->n_cbs_invoked, rdp->n_nocbs_invoked,
		   rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
}

static int show_rcudata(struct seq_file *m, void *v)
{
	print_one_rcu_data(m, (struct rcu_data *)v);
	return 0;
}

static const struct seq_operations rcudate_op = {
	.start = r_start,
	.next  = r_next,
	.stop  = r_stop,
	.show  = show_rcudata,
};

static int rcudata_open(struct inode *inode, struct file *file)
{
	return r_open(inode, file, &rcudate_op);
}

static const struct file_operations rcudata_fops = {
	.owner = THIS_MODULE,
	.open = rcudata_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = seq_release,
};

static int show_rcuexp(struct seq_file *m, void *v)
{
	int cpu;
	struct rcu_state *rsp = (struct rcu_state *)m->private;
	struct rcu_data *rdp;
	unsigned long s0 = 0, s1 = 0, s2 = 0, s3 = 0;

	for_each_possible_cpu(cpu) {
		rdp = per_cpu_ptr(rsp->rda, cpu);
		s0 += atomic_long_read(&rdp->expedited_workdone0);
		s1 += atomic_long_read(&rdp->expedited_workdone1);
		s2 += atomic_long_read(&rdp->expedited_workdone2);
		s3 += atomic_long_read(&rdp->expedited_workdone3);
	}
	seq_printf(m, "s=%lu wd0=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu enq=%d sc=%lu\n",
		   rsp->expedited_sequence, s0, s1, s2, s3,
		   atomic_long_read(&rsp->expedited_normal),
		   atomic_read(&rsp->expedited_need_qs),
		   rsp->expedited_sequence / 2);
	return 0;
}

static int rcuexp_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcuexp, inode->i_private);
}

static const struct file_operations rcuexp_fops = {
	.owner = THIS_MODULE,
	.open = rcuexp_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = single_release,
};

#ifdef CONFIG_RCU_BOOST

static void print_one_rcu_node_boost(struct seq_file *m, struct rcu_node *rnp)
{
	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
		   rnp->grplo, rnp->grphi,
		   "T."[list_empty(&rnp->blkd_tasks)],
		   "N."[!rnp->gp_tasks],
		   "E."[!rnp->exp_tasks],
		   "B."[!rnp->boost_tasks],
		   convert_kthread_status(rnp->boost_kthread_status),
		   rnp->n_tasks_boosted, rnp->n_exp_boosts,
		   rnp->n_normal_boosts);
	seq_printf(m, "j=%04x bt=%04x\n",
		   (int)(jiffies & 0xffff),
		   (int)(rnp->boost_time & 0xffff));
	seq_printf(m, "    balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
		   rnp->n_balk_blkd_tasks,
		   rnp->n_balk_exp_gp_tasks,
		   rnp->n_balk_boost_tasks,
		   rnp->n_balk_notblocked,
		   rnp->n_balk_notyet,
		   rnp->n_balk_nos);
}

static int show_rcu_node_boost(struct seq_file *m, void *unused)
{
	struct rcu_node *rnp;

	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
		print_one_rcu_node_boost(m, rnp);
	return 0;
}

static int rcu_node_boost_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcu_node_boost, NULL);
}

static const struct file_operations rcu_node_boost_fops = {
	.owner = THIS_MODULE,
	.open = rcu_node_boost_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = single_release,
};

#endif /* #ifdef CONFIG_RCU_BOOST */

static void print_one_rcu_state(struct seq_file *m, struct rcu_state *rsp)
{
	unsigned long gpnum;
	int level = 0;
	struct rcu_node *rnp;

	gpnum = rsp->gpnum;
	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ",
		   ulong2long(rsp->completed), ulong2long(gpnum),
		   rsp->gp_state,
		   (long)(rsp->jiffies_force_qs - jiffies),
		   (int)(jiffies & 0xffff));
	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
		   rsp->n_force_qs, rsp->n_force_qs_ngp,
		   rsp->n_force_qs - rsp->n_force_qs_ngp,
		   READ_ONCE(rsp->n_force_qs_lh), rsp->qlen_lazy, rsp->qlen);
	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
		if (rnp->level != level) {
			seq_puts(m, "\n");
			level = rnp->level;
		}
		seq_printf(m, "%lx/%lx->%lx %c%c>%c %d:%d ^%d    ",
			   rnp->qsmask, rnp->qsmaskinit, rnp->qsmaskinitnext,
			   ".G"[rnp->gp_tasks != NULL],
			   ".E"[rnp->exp_tasks != NULL],
			   ".T"[!list_empty(&rnp->blkd_tasks)],
			   rnp->grplo, rnp->grphi, rnp->grpnum);
	}
	seq_puts(m, "\n");
}

static int show_rcuhier(struct seq_file *m, void *v)
{
	struct rcu_state *rsp = (struct rcu_state *)m->private;
	print_one_rcu_state(m, rsp);
	return 0;
}

static int rcuhier_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcuhier, inode->i_private);
}

static const struct file_operations rcuhier_fops = {
	.owner = THIS_MODULE,
	.open = rcuhier_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = single_release,
};

static void show_one_rcugp(struct seq_file *m, struct rcu_state *rsp)
{
	unsigned long flags;
	unsigned long completed;
	unsigned long gpnum;
	unsigned long gpage;
	unsigned long gpmax;
	struct rcu_node *rnp = &rsp->node[0];

	raw_spin_lock_irqsave_rcu_node(rnp, flags);
	completed = READ_ONCE(rsp->completed);
	gpnum = READ_ONCE(rsp->gpnum);
	if (completed == gpnum)
		gpage = 0;
	else
		gpage = jiffies - rsp->gp_start;
	gpmax = rsp->gp_max;
	raw_spin_unlock_irqrestore(&rnp->lock, flags);
	seq_printf(m, "completed=%ld  gpnum=%ld  age=%ld  max=%ld\n",
		   ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
}

static int show_rcugp(struct seq_file *m, void *v)
{
	struct rcu_state *rsp = (struct rcu_state *)m->private;
	show_one_rcugp(m, rsp);
	return 0;
}

static int rcugp_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcugp, inode->i_private);
}

static const struct file_operations rcugp_fops = {
	.owner = THIS_MODULE,
	.open = rcugp_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = single_release,
};

static void print_one_rcu_pending(struct seq_file *m, struct rcu_data *rdp)
{
	if (!rdp->beenonline)
		return;
	seq_printf(m, "%3d%cnp=%ld ",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   rdp->n_rcu_pending);
	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
		   rdp->n_rp_core_needs_qs,
		   rdp->n_rp_report_qs,
		   rdp->n_rp_cb_ready,
		   rdp->n_rp_cpu_needs_gp);
	seq_printf(m, "gpc=%ld gps=%ld nn=%ld ndw%ld\n",
		   rdp->n_rp_gp_completed,
		   rdp->n_rp_gp_started,
		   rdp->n_rp_nocb_defer_wakeup,
		   rdp->n_rp_need_nothing);
}

static int show_rcu_pending(struct seq_file *m, void *v)
{
	print_one_rcu_pending(m, (struct rcu_data *)v);
	return 0;
}

static const struct seq_operations rcu_pending_op = {
	.start = r_start,
	.next  = r_next,
	.stop  = r_stop,
	.show  = show_rcu_pending,
};

static int rcu_pending_open(struct inode *inode, struct file *file)
{
	return r_open(inode, file, &rcu_pending_op);
}

static const struct file_operations rcu_pending_fops = {
	.owner = THIS_MODULE,
	.open = rcu_pending_open,
	.read = seq_read,
	.llseek = no_llseek,
	.release = seq_release,
};

static int show_rcutorture(struct seq_file *m, void *unused)
{
	seq_printf(m, "rcutorture test sequence: %lu %s\n",
		   rcutorture_testseq >> 1,
		   (rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	seq_printf(m, "rcutorture update version number: %lu\n",
		   rcutorture_vernum);
	return 0;
}

static int rcutorture_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcutorture, NULL);
}

static const struct file_operations rcutorture_fops = {
	.owner = THIS_MODULE,
	.open = rcutorture_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static struct dentry *rcudir;

static int __init rcutree_trace_init(void)
{
	struct rcu_state *rsp;
	struct dentry *retval;
	struct dentry *rspdir;

	rcudir = debugfs_create_dir("rcu", NULL);
	if (!rcudir)
		goto free_out;

	for_each_rcu_flavor(rsp) {
		rspdir = debugfs_create_dir(rsp->name, rcudir);
		if (!rspdir)
			goto free_out;

		retval = debugfs_create_file("rcudata", 0444,
				rspdir, rsp, &rcudata_fops);
		if (!retval)
			goto free_out;

		retval = debugfs_create_file("rcuexp", 0444,
				rspdir, rsp, &rcuexp_fops);
		if (!retval)
			goto free_out;

		retval = debugfs_create_file("rcu_pending", 0444,
				rspdir, rsp, &rcu_pending_fops);
		if (!retval)
			goto free_out;

		retval = debugfs_create_file("rcubarrier", 0444,
				rspdir, rsp, &rcubarrier_fops);
		if (!retval)
			goto free_out;

#ifdef CONFIG_RCU_BOOST
		if (rsp == &rcu_preempt_state) {
			retval = debugfs_create_file("rcuboost", 0444,
				rspdir, NULL, &rcu_node_boost_fops);
			if (!retval)
				goto free_out;
		}
#endif

		retval = debugfs_create_file("rcugp", 0444,
				rspdir, rsp, &rcugp_fops);
		if (!retval)
			goto free_out;

		retval = debugfs_create_file("rcuhier", 0444,
				rspdir, rsp, &rcuhier_fops);
		if (!retval)
			goto free_out;
	}

	retval = debugfs_create_file("rcutorture", 0444, rcudir,
						NULL, &rcutorture_fops);
	if (!retval)
		goto free_out;
	return 0;
free_out:
	debugfs_remove_recursive(rcudir);
	return 1;
}
device_initcall(rcutree_trace_init);
Commit	Line	Data
64db4cff	1	/*
47dbc906	2	* Read-Copy Update tracing for hierarchical implementation.
64db4cff PM	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
87de1cfd PM	15	* along with this program; if not, you can access it online at
87de1cfd PM	16	* http://www.gnu.org/licenses/gpl-2.0.html.
64db4cff PM	17	*
64db4cff PM	18	* Copyright IBM Corporation, 2008
47dbc906	19	* Author: Paul E. McKenney
64db4cff PM	20	*
	21	* Papers: http://www.rdrop.com/users/paulmck/RCU
	22	*
	23	* For detailed explanation of Read-Copy Update mechanism see -
a71fca58	24	* Documentation/RCU
64db4cff PM	25	*
	26	*/
	27	#include <linux/types.h>
	28	#include <linux/kernel.h>
	29	#include <linux/init.h>
	30	#include <linux/spinlock.h>
	31	#include <linux/smp.h>
	32	#include <linux/rcupdate.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/sched.h>
60063497	35	#include <linux/atomic.h>
64db4cff	36	#include <linux/bitops.h>
64db4cff	37	#include <linux/completion.h>
64db4cff PM	38	#include <linux/percpu.h>
	39	#include <linux/notifier.h>
	40	#include <linux/cpu.h>
	41	#include <linux/mutex.h>
	42	#include <linux/debugfs.h>
	43	#include <linux/seq_file.h>
	44
9f77da9f	45	#define RCU_TREE_NONCORE
4102adab	46	#include "tree.h"
6258c4fb	47
5cd37193 PM	48	DECLARE_PER_CPU_SHARED_ALIGNED(unsigned long, rcu_qs_ctr);
5cd37193 PM	49
374b928e MW	50	static int r_open(struct inode inode, struct file file,
	51	const struct seq_operations *op)
	52	{
	53	int ret = seq_open(file, op);
	54	if (!ret) {
	55	struct seq_file m = (struct seq_file )file->private_data;
	56	m->private = inode->i_private;
	57	}
	58	return ret;
	59	}
	60
	61	static void r_start(struct seq_file m, loff_t *pos)
	62	{
	63	struct rcu_state rsp = (struct rcu_state )m->private;
	64	pos = cpumask_next(pos - 1, cpu_possible_mask);
	65	if ((*pos) < nr_cpu_ids)
	66	return per_cpu_ptr(rsp->rda, *pos);
	67	return NULL;
	68	}
	69
	70	static void r_next(struct seq_file m, void v, loff_t pos)
	71	{
	72	(*pos)++;
	73	return r_start(m, pos);
	74	}
	75
	76	static void r_stop(struct seq_file m, void v)
	77	{
	78	}
	79
6ee0886f	80	static int show_rcubarrier(struct seq_file m, void v)
c25e557f MW	81	{
c25e557f MW	82	struct rcu_state rsp = (struct rcu_state )m->private;
4f525a52	83	seq_printf(m, "bcc: %d bseq: %lu\n",
c25e557f	84	atomic_read(&rsp->barrier_cpu_count),
4f525a52	85	rsp->barrier_sequence);
c25e557f MW	86	return 0;
	87	}
	88
6ee0886f	89	static int rcubarrier_open(struct inode inode, struct file file)
c25e557f	90	{
6ee0886f	91	return single_open(file, show_rcubarrier, inode->i_private);
c25e557f MW	92	}
c25e557f MW	93
6ee0886f	94	static const struct file_operations rcubarrier_fops = {
c25e557f	95	.owner = THIS_MODULE,
6ee0886f	96	.open = rcubarrier_open,
c25e557f MW	97	.read = seq_read,
c25e557f MW	98	.llseek = no_llseek,
7ee2b9e5	99	.release = single_release,
c25e557f MW	100	};
c25e557f MW	101
a46e0899 PM	102	#ifdef CONFIG_RCU_BOOST
a46e0899 PM	103
d71df90e PM	104	static char convert_kthread_status(unsigned int kthread_status)
	105	{
	106	if (kthread_status > RCU_KTHREAD_MAX)
	107	return '?';
15ba0ba8	108	return "SRWOY"[kthread_status];
d71df90e PM	109	}
d71df90e PM	110
a46e0899 PM	111	#endif /* #ifdef CONFIG_RCU_BOOST */
a46e0899 PM	112
64db4cff PM	113	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
64db4cff PM	114	{
3fbfbf7a PM	115	long ql, qll;
3fbfbf7a PM	116
64db4cff PM	117	if (!rdp->beenonline)
64db4cff PM	118	return;
0d43eb34	119	seq_printf(m, "%3d%cc=%ld g=%ld cnq=%d/%d:%d",
64db4cff PM	120	rdp->cpu,
64db4cff PM	121	cpu_is_offline(rdp->cpu) ? '!' : ' ',
42c3533e	122	ulong2long(rdp->completed), ulong2long(rdp->gpnum),
5b74c458	123	rdp->cpu_no_qs.b.norm,
5cd37193	124	rdp->rcu_qs_ctr_snap == per_cpu(rcu_qs_ctr, rdp->cpu),
97c668b8	125	rdp->core_needs_qs);
9b2e4f18	126	seq_printf(m, " dt=%d/%llx/%d df=%lu",
23b5c8fa	127	atomic_read(&rdp->dynticks->dynticks),
64db4cff	128	rdp->dynticks->dynticks_nesting,
23b5c8fa	129	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	130	rdp->dynticks_fqs);
2036d94a	131	seq_printf(m, " of=%lu", rdp->offline_fqs);
3fbfbf7a PM	132	rcu_nocb_q_lengths(rdp, &ql, &qll);
	133	qll += rdp->qlen_lazy;
	134	ql += rdp->qlen;
486e2593	135	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
3fbfbf7a	136	qll, ql,
0ac3d136 PM	137	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	138	rdp->nxttail[RCU_NEXT_TAIL]],
	139	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	140	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	141	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	142	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	143	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
a46e0899 PM	144	#ifdef CONFIG_RCU_BOOST
62ab7072	145	seq_printf(m, " kt=%d/%c ktl=%x",
d71df90e PM	146	per_cpu(rcu_cpu_has_work, rdp->cpu),
	147	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	148	rdp->cpu)),
a46e0899 PM	149	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
	150	#endif /* #ifdef CONFIG_RCU_BOOST */
	151	seq_printf(m, " b=%ld", rdp->blimit);
c635a4e1 PM	152	seq_printf(m, " ci=%lu nci=%lu co=%lu ca=%lu\n",
	153	rdp->n_cbs_invoked, rdp->n_nocbs_invoked,
	154	rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	155	}
64db4cff PM	156
c011c41f	157	static int show_rcudata(struct seq_file m, void v)
878eda72 MW	158	{
	159	print_one_rcu_data(m, (struct rcu_data *)v);
	160	return 0;
	161	}
	162
c011c41f	163	static const struct seq_operations rcudate_op = {
878eda72 MW	164	.start = r_start,
	165	.next = r_next,
	166	.stop = r_stop,
c011c41f	167	.show = show_rcudata,
878eda72 MW	168	};
878eda72 MW	169
c011c41f	170	static int rcudata_open(struct inode inode, struct file file)
878eda72	171	{
c011c41f	172	return r_open(inode, file, &rcudate_op);
878eda72 MW	173	}
878eda72 MW	174
c011c41f	175	static const struct file_operations rcudata_fops = {
878eda72	176	.owner = THIS_MODULE,
c011c41f	177	.open = rcudata_open,
878eda72 MW	178	.read = seq_read,
	179	.llseek = no_llseek,
	180	.release = seq_release,
	181	};
	182
7bd8f2a7 PM	183	static int show_rcuexp(struct seq_file m, void v)
7bd8f2a7 PM	184	{
df5bd514	185	int cpu;
7bd8f2a7	186	struct rcu_state rsp = (struct rcu_state )m->private;
df5bd514 PM	187	struct rcu_data *rdp;
	188	unsigned long s0 = 0, s1 = 0, s2 = 0, s3 = 0;
	189
	190	for_each_possible_cpu(cpu) {
	191	rdp = per_cpu_ptr(rsp->rda, cpu);
	192	s0 += atomic_long_read(&rdp->expedited_workdone0);
	193	s1 += atomic_long_read(&rdp->expedited_workdone1);
	194	s2 += atomic_long_read(&rdp->expedited_workdone2);
	195	s3 += atomic_long_read(&rdp->expedited_workdone3);
	196	}
cdacbe1f	197	seq_printf(m, "s=%lu wd0=%lu wd1=%lu wd2=%lu wd3=%lu n=%lu enq=%d sc=%lu\n",
df5bd514	198	rsp->expedited_sequence, s0, s1, s2, s3,
7bd8f2a7	199	atomic_long_read(&rsp->expedited_normal),
3a6d7c64	200	atomic_read(&rsp->expedited_need_qs),
d6ada2cf	201	rsp->expedited_sequence / 2);
7bd8f2a7 PM	202	return 0;
	203	}
	204
	205	static int rcuexp_open(struct inode inode, struct file file)
	206	{
	207	return single_open(file, show_rcuexp, inode->i_private);
	208	}
	209
	210	static const struct file_operations rcuexp_fops = {
	211	.owner = THIS_MODULE,
	212	.open = rcuexp_open,
	213	.read = seq_read,
	214	.llseek = no_llseek,
7ee2b9e5	215	.release = single_release,
7bd8f2a7 PM	216	};
7bd8f2a7 PM	217
0ea1f2eb PM	218	#ifdef CONFIG_RCU_BOOST
	219
	220	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	221	{
5cf05ad7	222	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
0ea1f2eb PM	223	rnp->grplo, rnp->grphi,
	224	"T."[list_empty(&rnp->blkd_tasks)],
	225	"N."[!rnp->gp_tasks],
	226	"E."[!rnp->exp_tasks],
	227	"B."[!rnp->boost_tasks],
d71df90e	228	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb	229	rnp->n_tasks_boosted, rnp->n_exp_boosts,
5cf05ad7 PM	230	rnp->n_normal_boosts);
5cf05ad7 PM	231	seq_printf(m, "j=%04x bt=%04x\n",
0ea1f2eb PM	232	(int)(jiffies & 0xffff),
0ea1f2eb PM	233	(int)(rnp->boost_time & 0xffff));
5cf05ad7	234	seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
0ea1f2eb PM	235	rnp->n_balk_blkd_tasks,
	236	rnp->n_balk_exp_gp_tasks,
	237	rnp->n_balk_boost_tasks,
	238	rnp->n_balk_notblocked,
	239	rnp->n_balk_notyet,
	240	rnp->n_balk_nos);
	241	}
	242
	243	static int show_rcu_node_boost(struct seq_file m, void unused)
	244	{
	245	struct rcu_node *rnp;
	246
	247	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	248	print_one_rcu_node_boost(m, rnp);
	249	return 0;
	250	}
	251
	252	static int rcu_node_boost_open(struct inode inode, struct file file)
	253	{
	254	return single_open(file, show_rcu_node_boost, NULL);
	255	}
	256
	257	static const struct file_operations rcu_node_boost_fops = {
	258	.owner = THIS_MODULE,
	259	.open = rcu_node_boost_open,
	260	.read = seq_read,
29c67764	261	.llseek = no_llseek,
0ea1f2eb PM	262	.release = single_release,
	263	};
	264
6ee0886f	265	#endif /* #ifdef CONFIG_RCU_BOOST */
0ea1f2eb	266
64db4cff PM	267	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	268	{
20133cfc	269	unsigned long gpnum;
64db4cff PM	270	int level = 0;
	271	struct rcu_node *rnp;
	272
3397e040	273	gpnum = rsp->gpnum;
6ee0886f MW	274	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ",
6ee0886f MW	275	ulong2long(rsp->completed), ulong2long(gpnum),
77f81fe0	276	rsp->gp_state,
64db4cff	277	(long)(rsp->jiffies_force_qs - jiffies),
5cf05ad7 PM	278	(int)(jiffies & 0xffff));
5cf05ad7 PM	279	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
64db4cff PM	280	rsp->n_force_qs, rsp->n_force_qs_ngp,
64db4cff PM	281	rsp->n_force_qs - rsp->n_force_qs_ngp,
7d0ae808	282	READ_ONCE(rsp->n_force_qs_lh), rsp->qlen_lazy, rsp->qlen);
f885b7f2	283	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
64db4cff PM	284	if (rnp->level != level) {
	285	seq_puts(m, "\n");
	286	level = rnp->level;
	287	}
0aa04b05 PM	288	seq_printf(m, "%lx/%lx->%lx %c%c>%c %d:%d ^%d ",
0aa04b05 PM	289	rnp->qsmask, rnp->qsmaskinit, rnp->qsmaskinitnext,
12f5f524 PM	290	".G"[rnp->gp_tasks != NULL],
	291	".E"[rnp->exp_tasks != NULL],
	292	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	293	rnp->grplo, rnp->grphi, rnp->grpnum);
	294	}
	295	seq_puts(m, "\n");
	296	}
	297
6ee0886f	298	static int show_rcuhier(struct seq_file m, void v)
64db4cff	299	{
6ee0886f MW	300	struct rcu_state rsp = (struct rcu_state )m->private;
6ee0886f MW	301	print_one_rcu_state(m, rsp);
64db4cff PM	302	return 0;
	303	}
	304
	305	static int rcuhier_open(struct inode inode, struct file file)
	306	{
6ee0886f	307	return single_open(file, show_rcuhier, inode->i_private);
64db4cff PM	308	}
64db4cff PM	309
9b2619af	310	static const struct file_operations rcuhier_fops = {
64db4cff PM	311	.owner = THIS_MODULE,
	312	.open = rcuhier_open,
	313	.read = seq_read,
a608d84b	314	.llseek = no_llseek,
7ee2b9e5	315	.release = single_release,
a608d84b MW	316	};
a608d84b MW	317
15ba0ba8 PM	318	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	319	{
	320	unsigned long flags;
	321	unsigned long completed;
	322	unsigned long gpnum;
	323	unsigned long gpage;
	324	unsigned long gpmax;
	325	struct rcu_node *rnp = &rsp->node[0];
	326
6cf10081	327	raw_spin_lock_irqsave_rcu_node(rnp, flags);
7d0ae808 PM	328	completed = READ_ONCE(rsp->completed);
7d0ae808 PM	329	gpnum = READ_ONCE(rsp->gpnum);
42c3533e	330	if (completed == gpnum)
15ba0ba8 PM	331	gpage = 0;
	332	else
	333	gpage = jiffies - rsp->gp_start;
	334	gpmax = rsp->gp_max;
	335	raw_spin_unlock_irqrestore(&rnp->lock, flags);
6ee0886f MW	336	seq_printf(m, "completed=%ld gpnum=%ld age=%ld max=%ld\n",
6ee0886f MW	337	ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
15ba0ba8 PM	338	}
15ba0ba8 PM	339
6ee0886f	340	static int show_rcugp(struct seq_file m, void v)
64db4cff	341	{
6ee0886f MW	342	struct rcu_state rsp = (struct rcu_state )m->private;
6ee0886f MW	343	show_one_rcugp(m, rsp);
64db4cff PM	344	return 0;
	345	}
	346
	347	static int rcugp_open(struct inode inode, struct file file)
	348	{
6ee0886f	349	return single_open(file, show_rcugp, inode->i_private);
64db4cff PM	350	}
64db4cff PM	351
9b2619af	352	static const struct file_operations rcugp_fops = {
64db4cff PM	353	.owner = THIS_MODULE,
	354	.open = rcugp_open,
	355	.read = seq_read,
66b38bc5	356	.llseek = no_llseek,
7ee2b9e5	357	.release = single_release,
66b38bc5 MW	358	};
66b38bc5 MW	359
7ba5c840 PM	360	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
7ba5c840 PM	361	{
51d0f16d MW	362	if (!rdp->beenonline)
51d0f16d MW	363	return;
5cf05ad7	364	seq_printf(m, "%3d%cnp=%ld ",
7ba5c840 PM	365	rdp->cpu,
7ba5c840 PM	366	cpu_is_offline(rdp->cpu) ? '!' : ' ',
5cf05ad7 PM	367	rdp->n_rcu_pending);
5cf05ad7 PM	368	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
97c668b8	369	rdp->n_rp_core_needs_qs,
d21670ac	370	rdp->n_rp_report_qs,
7ba5c840	371	rdp->n_rp_cb_ready,
5cf05ad7	372	rdp->n_rp_cpu_needs_gp);
96d3fd0d	373	seq_printf(m, "gpc=%ld gps=%ld nn=%ld ndw%ld\n",
7ba5c840 PM	374	rdp->n_rp_gp_completed,
7ba5c840 PM	375	rdp->n_rp_gp_started,
96d3fd0d	376	rdp->n_rp_nocb_defer_wakeup,
7ba5c840 PM	377	rdp->n_rp_need_nothing);
	378	}
	379
c011c41f	380	static int show_rcu_pending(struct seq_file m, void v)
51d0f16d MW	381	{
	382	print_one_rcu_pending(m, (struct rcu_data *)v);
	383	return 0;
	384	}
	385
c011c41f	386	static const struct seq_operations rcu_pending_op = {
51d0f16d MW	387	.start = r_start,
	388	.next = r_next,
	389	.stop = r_stop,
c011c41f	390	.show = show_rcu_pending,
51d0f16d MW	391	};
51d0f16d MW	392
c011c41f	393	static int rcu_pending_open(struct inode inode, struct file file)
51d0f16d	394	{
c011c41f	395	return r_open(inode, file, &rcu_pending_op);
51d0f16d MW	396	}
51d0f16d MW	397
c011c41f	398	static const struct file_operations rcu_pending_fops = {
51d0f16d	399	.owner = THIS_MODULE,
c011c41f	400	.open = rcu_pending_open,
51d0f16d MW	401	.read = seq_read,
	402	.llseek = no_llseek,
	403	.release = seq_release,
	404	};
	405
4a298656 PM	406	static int show_rcutorture(struct seq_file m, void unused)
	407	{
	408	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	409	rcutorture_testseq >> 1,
	410	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	411	seq_printf(m, "rcutorture update version number: %lu\n",
	412	rcutorture_vernum);
	413	return 0;
	414	}
	415
	416	static int rcutorture_open(struct inode inode, struct file file)
	417	{
	418	return single_open(file, show_rcutorture, NULL);
	419	}
	420
	421	static const struct file_operations rcutorture_fops = {
	422	.owner = THIS_MODULE,
	423	.open = rcutorture_open,
	424	.read = seq_read,
	425	.llseek = seq_lseek,
	426	.release = single_release,
	427	};
	428
7ba5c840	429	static struct dentry *rcudir;
7ba5c840	430
deb7a418	431	static int __init rcutree_trace_init(void)
64db4cff	432	{
573bcd40	433	struct rcu_state *rsp;
22f00b69	434	struct dentry *retval;
573bcd40	435	struct dentry *rspdir;
22f00b69	436
64db4cff PM	437	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	438	if (!rcudir)
22f00b69	439	goto free_out;
64db4cff	440
573bcd40 MW	441	for_each_rcu_flavor(rsp) {
	442	rspdir = debugfs_create_dir(rsp->name, rcudir);
	443	if (!rspdir)
	444	goto free_out;
878eda72	445
6ee0886f MW	446	retval = debugfs_create_file("rcudata", 0444,
	447	rspdir, rsp, &rcudata_fops);
	448	if (!retval)
	449	goto free_out;
51d0f16d	450
7bd8f2a7 PM	451	retval = debugfs_create_file("rcuexp", 0444,
	452	rspdir, rsp, &rcuexp_fops);
	453	if (!retval)
	454	goto free_out;
	455
6ee0886f MW	456	retval = debugfs_create_file("rcu_pending", 0444,
	457	rspdir, rsp, &rcu_pending_fops);
	458	if (!retval)
	459	goto free_out;
c25e557f	460
6ee0886f MW	461	retval = debugfs_create_file("rcubarrier", 0444,
	462	rspdir, rsp, &rcubarrier_fops);
	463	if (!retval)
	464	goto free_out;
29c67764 MW	465
29c67764 MW	466	#ifdef CONFIG_RCU_BOOST
6ee0886f MW	467	if (rsp == &rcu_preempt_state) {
	468	retval = debugfs_create_file("rcuboost", 0444,
	469	rspdir, NULL, &rcu_node_boost_fops);
66b38bc5 MW	470	if (!retval)
66b38bc5 MW	471	goto free_out;
6ee0886f MW	472	}
6ee0886f MW	473	#endif
66b38bc5	474
6ee0886f MW	475	retval = debugfs_create_file("rcugp", 0444,
	476	rspdir, rsp, &rcugp_fops);
	477	if (!retval)
	478	goto free_out;
64db4cff	479
6ee0886f MW	480	retval = debugfs_create_file("rcuhier", 0444,
	481	rspdir, rsp, &rcuhier_fops);
	482	if (!retval)
	483	goto free_out;
	484	}
7ba5c840	485
4a298656 PM	486	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	487	NULL, &rcutorture_fops);
	488	if (!retval)
	489	goto free_out;
64db4cff PM	490	return 0;
64db4cff PM	491	free_out:
22f00b69	492	debugfs_remove_recursive(rcudir);
64db4cff PM	493	return 1;
64db4cff PM	494	}
47dbc906	495	device_initcall(rcutree_trace_init);