[linux-2.6-block.git] / kernel / rcutree_trace.c

/*
 * Read-Copy Update tracing for classic 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright IBM Corporation, 2008
 *
 * 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/module.h>
#include <linux/completion.h>
#include <linux/moduleparam.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 "rcutree.h"

#define ulong2long(a) (*(long *)(&(a)))

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 nbd: %lu\n",
		   atomic_read(&rsp->barrier_cpu_count),
		   rsp->n_barrier_done);
	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 = seq_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)
{
	if (!rdp->beenonline)
		return;
	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   ulong2long(rdp->completed), ulong2long(rdp->gpnum),
		   rdp->passed_quiesce, rdp->qs_pending);
	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);
	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
		   rdp->qlen_lazy, rdp->qlen,
		   ".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 co=%lu ca=%lu\n",
		   rdp->n_cbs_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,
};

#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->fqs_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,
		   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 %c%c>%c %d:%d ^%d    ",
			   rnp->qsmask, rnp->qsmaskinit,
			   ".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 = seq_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(&rnp->lock, flags);
	completed = ACCESS_ONCE(rsp->completed);
	gpnum = ACCESS_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 = seq_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_qs_pending,
		   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\n",
		   rdp->n_rp_gp_completed,
		   rdp->n_rp_gp_started,
		   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("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;
}

static void __exit rcutree_trace_cleanup(void)
{
	debugfs_remove_recursive(rcudir);
}


module_init(rcutree_trace_init);
module_exit(rcutree_trace_cleanup);

MODULE_AUTHOR("Paul E. McKenney");
MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
MODULE_LICENSE("GPL");
Commit	Line	Data
64db4cff PM	1	/*
	2	* Read-Copy Update tracing for classic implementation
	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
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*
	18	* Copyright IBM Corporation, 2008
	19	*
	20	* Papers: http://www.rdrop.com/users/paulmck/RCU
	21	*
	22	* For detailed explanation of Read-Copy Update mechanism see -
a71fca58	23	* Documentation/RCU
64db4cff PM	24	*
	25	*/
	26	#include <linux/types.h>
	27	#include <linux/kernel.h>
	28	#include <linux/init.h>
	29	#include <linux/spinlock.h>
	30	#include <linux/smp.h>
	31	#include <linux/rcupdate.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/sched.h>
60063497	34	#include <linux/atomic.h>
64db4cff PM	35	#include <linux/bitops.h>
	36	#include <linux/module.h>
	37	#include <linux/completion.h>
	38	#include <linux/moduleparam.h>
	39	#include <linux/percpu.h>
	40	#include <linux/notifier.h>
	41	#include <linux/cpu.h>
	42	#include <linux/mutex.h>
	43	#include <linux/debugfs.h>
	44	#include <linux/seq_file.h>
	45
9f77da9f	46	#define RCU_TREE_NONCORE
6258c4fb IM	47	#include "rcutree.h"
6258c4fb IM	48
42c3533e PM	49	#define ulong2long(a) ((long )(&(a)))
42c3533e PM	50
374b928e MW	51	static int r_open(struct inode inode, struct file file,
	52	const struct seq_operations *op)
	53	{
	54	int ret = seq_open(file, op);
	55	if (!ret) {
	56	struct seq_file m = (struct seq_file )file->private_data;
	57	m->private = inode->i_private;
	58	}
	59	return ret;
	60	}
	61
	62	static void r_start(struct seq_file m, loff_t *pos)
	63	{
	64	struct rcu_state rsp = (struct rcu_state )m->private;
	65	pos = cpumask_next(pos - 1, cpu_possible_mask);
	66	if ((*pos) < nr_cpu_ids)
	67	return per_cpu_ptr(rsp->rda, *pos);
	68	return NULL;
	69	}
	70
	71	static void r_next(struct seq_file m, void v, loff_t pos)
	72	{
	73	(*pos)++;
	74	return r_start(m, pos);
	75	}
	76
	77	static void r_stop(struct seq_file m, void v)
	78	{
	79	}
	80
6ee0886f	81	static int show_rcubarrier(struct seq_file m, void v)
c25e557f MW	82	{
	83	struct rcu_state rsp = (struct rcu_state )m->private;
	84	seq_printf(m, "bcc: %d nbd: %lu\n",
	85	atomic_read(&rsp->barrier_cpu_count),
	86	rsp->n_barrier_done);
	87	return 0;
	88	}
	89
6ee0886f	90	static int rcubarrier_open(struct inode inode, struct file file)
c25e557f	91	{
6ee0886f	92	return single_open(file, show_rcubarrier, inode->i_private);
c25e557f MW	93	}
c25e557f MW	94
6ee0886f	95	static const struct file_operations rcubarrier_fops = {
c25e557f	96	.owner = THIS_MODULE,
6ee0886f	97	.open = rcubarrier_open,
c25e557f MW	98	.read = seq_read,
	99	.llseek = no_llseek,
	100	.release = seq_release,
	101	};
	102
a46e0899 PM	103	#ifdef CONFIG_RCU_BOOST
a46e0899 PM	104
d71df90e PM	105	static char convert_kthread_status(unsigned int kthread_status)
	106	{
	107	if (kthread_status > RCU_KTHREAD_MAX)
	108	return '?';
15ba0ba8	109	return "SRWOY"[kthread_status];
d71df90e PM	110	}
d71df90e PM	111
a46e0899 PM	112	#endif /* #ifdef CONFIG_RCU_BOOST */
a46e0899 PM	113
64db4cff PM	114	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	115	{
	116	if (!rdp->beenonline)
	117	return;
42c3533e	118	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
64db4cff PM	119	rdp->cpu,
64db4cff PM	120	cpu_is_offline(rdp->cpu) ? '!' : ' ',
42c3533e	121	ulong2long(rdp->completed), ulong2long(rdp->gpnum),
d7d6a11e	122	rdp->passed_quiesce, rdp->qs_pending);
9b2e4f18	123	seq_printf(m, " dt=%d/%llx/%d df=%lu",
23b5c8fa	124	atomic_read(&rdp->dynticks->dynticks),
64db4cff	125	rdp->dynticks->dynticks_nesting,
23b5c8fa	126	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	127	rdp->dynticks_fqs);
2036d94a	128	seq_printf(m, " of=%lu", rdp->offline_fqs);
486e2593 PM	129	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
486e2593 PM	130	rdp->qlen_lazy, rdp->qlen,
0ac3d136 PM	131	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	132	rdp->nxttail[RCU_NEXT_TAIL]],
	133	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	134	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	135	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	136	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	137	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
a46e0899 PM	138	#ifdef CONFIG_RCU_BOOST
62ab7072	139	seq_printf(m, " kt=%d/%c ktl=%x",
d71df90e PM	140	per_cpu(rcu_cpu_has_work, rdp->cpu),
	141	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	142	rdp->cpu)),
a46e0899 PM	143	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
	144	#endif /* #ifdef CONFIG_RCU_BOOST */
	145	seq_printf(m, " b=%ld", rdp->blimit);
269dcc1c PM	146	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	147	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	148	}
64db4cff PM	149
c011c41f	150	static int show_rcudata(struct seq_file m, void v)
878eda72 MW	151	{
	152	print_one_rcu_data(m, (struct rcu_data *)v);
	153	return 0;
	154	}
	155
c011c41f	156	static const struct seq_operations rcudate_op = {
878eda72 MW	157	.start = r_start,
	158	.next = r_next,
	159	.stop = r_stop,
c011c41f	160	.show = show_rcudata,
878eda72 MW	161	};
878eda72 MW	162
c011c41f	163	static int rcudata_open(struct inode inode, struct file file)
878eda72	164	{
c011c41f	165	return r_open(inode, file, &rcudate_op);
878eda72 MW	166	}
878eda72 MW	167
c011c41f	168	static const struct file_operations rcudata_fops = {
878eda72	169	.owner = THIS_MODULE,
c011c41f	170	.open = rcudata_open,
878eda72 MW	171	.read = seq_read,
	172	.llseek = no_llseek,
	173	.release = seq_release,
	174	};
	175
0ea1f2eb PM	176	#ifdef CONFIG_RCU_BOOST
	177
	178	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	179	{
5cf05ad7	180	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
0ea1f2eb PM	181	rnp->grplo, rnp->grphi,
	182	"T."[list_empty(&rnp->blkd_tasks)],
	183	"N."[!rnp->gp_tasks],
	184	"E."[!rnp->exp_tasks],
	185	"B."[!rnp->boost_tasks],
d71df90e	186	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb	187	rnp->n_tasks_boosted, rnp->n_exp_boosts,
5cf05ad7 PM	188	rnp->n_normal_boosts);
5cf05ad7 PM	189	seq_printf(m, "j=%04x bt=%04x\n",
0ea1f2eb PM	190	(int)(jiffies & 0xffff),
0ea1f2eb PM	191	(int)(rnp->boost_time & 0xffff));
5cf05ad7	192	seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
0ea1f2eb PM	193	rnp->n_balk_blkd_tasks,
	194	rnp->n_balk_exp_gp_tasks,
	195	rnp->n_balk_boost_tasks,
	196	rnp->n_balk_notblocked,
	197	rnp->n_balk_notyet,
	198	rnp->n_balk_nos);
	199	}
	200
	201	static int show_rcu_node_boost(struct seq_file m, void unused)
	202	{
	203	struct rcu_node *rnp;
	204
	205	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	206	print_one_rcu_node_boost(m, rnp);
	207	return 0;
	208	}
	209
	210	static int rcu_node_boost_open(struct inode inode, struct file file)
	211	{
	212	return single_open(file, show_rcu_node_boost, NULL);
	213	}
	214
	215	static const struct file_operations rcu_node_boost_fops = {
	216	.owner = THIS_MODULE,
	217	.open = rcu_node_boost_open,
	218	.read = seq_read,
29c67764	219	.llseek = no_llseek,
0ea1f2eb PM	220	.release = single_release,
	221	};
	222
6ee0886f	223	#endif /* #ifdef CONFIG_RCU_BOOST */
0ea1f2eb	224
64db4cff PM	225	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	226	{
20133cfc	227	unsigned long gpnum;
64db4cff PM	228	int level = 0;
	229	struct rcu_node *rnp;
	230
3397e040	231	gpnum = rsp->gpnum;
6ee0886f MW	232	seq_printf(m, "c=%ld g=%ld s=%d jfq=%ld j=%x ",
6ee0886f MW	233	ulong2long(rsp->completed), ulong2long(gpnum),
42c3533e	234	rsp->fqs_state,
64db4cff	235	(long)(rsp->jiffies_force_qs - jiffies),
5cf05ad7 PM	236	(int)(jiffies & 0xffff));
5cf05ad7 PM	237	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
64db4cff PM	238	rsp->n_force_qs, rsp->n_force_qs_ngp,
64db4cff PM	239	rsp->n_force_qs - rsp->n_force_qs_ngp,
b1420f1c	240	rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
f885b7f2	241	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
64db4cff PM	242	if (rnp->level != level) {
	243	seq_puts(m, "\n");
	244	level = rnp->level;
	245	}
12f5f524	246	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	247	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	248	".G"[rnp->gp_tasks != NULL],
	249	".E"[rnp->exp_tasks != NULL],
	250	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	251	rnp->grplo, rnp->grphi, rnp->grpnum);
	252	}
	253	seq_puts(m, "\n");
	254	}
	255
6ee0886f	256	static int show_rcuhier(struct seq_file m, void v)
64db4cff	257	{
6ee0886f MW	258	struct rcu_state rsp = (struct rcu_state )m->private;
6ee0886f MW	259	print_one_rcu_state(m, rsp);
64db4cff PM	260	return 0;
	261	}
	262
	263	static int rcuhier_open(struct inode inode, struct file file)
	264	{
6ee0886f	265	return single_open(file, show_rcuhier, inode->i_private);
64db4cff PM	266	}
64db4cff PM	267
9b2619af	268	static const struct file_operations rcuhier_fops = {
64db4cff PM	269	.owner = THIS_MODULE,
	270	.open = rcuhier_open,
	271	.read = seq_read,
a608d84b MW	272	.llseek = no_llseek,
	273	.release = seq_release,
	274	};
	275
15ba0ba8 PM	276	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	277	{
	278	unsigned long flags;
	279	unsigned long completed;
	280	unsigned long gpnum;
	281	unsigned long gpage;
	282	unsigned long gpmax;
	283	struct rcu_node *rnp = &rsp->node[0];
	284
	285	raw_spin_lock_irqsave(&rnp->lock, flags);
42c3533e PM	286	completed = ACCESS_ONCE(rsp->completed);
	287	gpnum = ACCESS_ONCE(rsp->gpnum);
	288	if (completed == gpnum)
15ba0ba8 PM	289	gpage = 0;
	290	else
	291	gpage = jiffies - rsp->gp_start;
	292	gpmax = rsp->gp_max;
	293	raw_spin_unlock_irqrestore(&rnp->lock, flags);
6ee0886f MW	294	seq_printf(m, "completed=%ld gpnum=%ld age=%ld max=%ld\n",
6ee0886f MW	295	ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
15ba0ba8 PM	296	}
15ba0ba8 PM	297
6ee0886f	298	static int show_rcugp(struct seq_file m, void v)
64db4cff	299	{
6ee0886f MW	300	struct rcu_state rsp = (struct rcu_state )m->private;
6ee0886f MW	301	show_one_rcugp(m, rsp);
64db4cff PM	302	return 0;
	303	}
	304
	305	static int rcugp_open(struct inode inode, struct file file)
	306	{
6ee0886f	307	return single_open(file, show_rcugp, inode->i_private);
64db4cff PM	308	}
64db4cff PM	309
9b2619af	310	static const struct file_operations rcugp_fops = {
64db4cff PM	311	.owner = THIS_MODULE,
	312	.open = rcugp_open,
	313	.read = seq_read,
66b38bc5 MW	314	.llseek = no_llseek,
	315	.release = seq_release,
	316	};
	317
7ba5c840 PM	318	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
7ba5c840 PM	319	{
51d0f16d MW	320	if (!rdp->beenonline)
51d0f16d MW	321	return;
5cf05ad7	322	seq_printf(m, "%3d%cnp=%ld ",
7ba5c840 PM	323	rdp->cpu,
7ba5c840 PM	324	cpu_is_offline(rdp->cpu) ? '!' : ' ',
5cf05ad7 PM	325	rdp->n_rcu_pending);
5cf05ad7 PM	326	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
7ba5c840	327	rdp->n_rp_qs_pending,
d21670ac	328	rdp->n_rp_report_qs,
7ba5c840	329	rdp->n_rp_cb_ready,
5cf05ad7	330	rdp->n_rp_cpu_needs_gp);
4605c014	331	seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
7ba5c840 PM	332	rdp->n_rp_gp_completed,
7ba5c840 PM	333	rdp->n_rp_gp_started,
7ba5c840 PM	334	rdp->n_rp_need_nothing);
	335	}
	336
c011c41f	337	static int show_rcu_pending(struct seq_file m, void v)
51d0f16d MW	338	{
	339	print_one_rcu_pending(m, (struct rcu_data *)v);
	340	return 0;
	341	}
	342
c011c41f	343	static const struct seq_operations rcu_pending_op = {
51d0f16d MW	344	.start = r_start,
	345	.next = r_next,
	346	.stop = r_stop,
c011c41f	347	.show = show_rcu_pending,
51d0f16d MW	348	};
51d0f16d MW	349
c011c41f	350	static int rcu_pending_open(struct inode inode, struct file file)
51d0f16d	351	{
c011c41f	352	return r_open(inode, file, &rcu_pending_op);
51d0f16d MW	353	}
51d0f16d MW	354
c011c41f	355	static const struct file_operations rcu_pending_fops = {
51d0f16d	356	.owner = THIS_MODULE,
c011c41f	357	.open = rcu_pending_open,
51d0f16d MW	358	.read = seq_read,
	359	.llseek = no_llseek,
	360	.release = seq_release,
	361	};
	362
4a298656 PM	363	static int show_rcutorture(struct seq_file m, void unused)
	364	{
	365	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	366	rcutorture_testseq >> 1,
	367	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	368	seq_printf(m, "rcutorture update version number: %lu\n",
	369	rcutorture_vernum);
	370	return 0;
	371	}
	372
	373	static int rcutorture_open(struct inode inode, struct file file)
	374	{
	375	return single_open(file, show_rcutorture, NULL);
	376	}
	377
	378	static const struct file_operations rcutorture_fops = {
	379	.owner = THIS_MODULE,
	380	.open = rcutorture_open,
	381	.read = seq_read,
	382	.llseek = seq_lseek,
	383	.release = single_release,
	384	};
	385
7ba5c840	386	static struct dentry *rcudir;
7ba5c840	387
deb7a418	388	static int __init rcutree_trace_init(void)
64db4cff	389	{
573bcd40	390	struct rcu_state *rsp;
22f00b69	391	struct dentry *retval;
573bcd40	392	struct dentry *rspdir;
22f00b69	393
64db4cff PM	394	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	395	if (!rcudir)
22f00b69	396	goto free_out;
64db4cff	397
573bcd40 MW	398	for_each_rcu_flavor(rsp) {
	399	rspdir = debugfs_create_dir(rsp->name, rcudir);
	400	if (!rspdir)
	401	goto free_out;
878eda72	402
6ee0886f MW	403	retval = debugfs_create_file("rcudata", 0444,
	404	rspdir, rsp, &rcudata_fops);
	405	if (!retval)
	406	goto free_out;
51d0f16d	407
6ee0886f MW	408	retval = debugfs_create_file("rcu_pending", 0444,
	409	rspdir, rsp, &rcu_pending_fops);
	410	if (!retval)
	411	goto free_out;
c25e557f	412
6ee0886f MW	413	retval = debugfs_create_file("rcubarrier", 0444,
	414	rspdir, rsp, &rcubarrier_fops);
	415	if (!retval)
	416	goto free_out;
29c67764 MW	417
29c67764 MW	418	#ifdef CONFIG_RCU_BOOST
6ee0886f MW	419	if (rsp == &rcu_preempt_state) {
	420	retval = debugfs_create_file("rcuboost", 0444,
	421	rspdir, NULL, &rcu_node_boost_fops);
66b38bc5 MW	422	if (!retval)
66b38bc5 MW	423	goto free_out;
6ee0886f MW	424	}
6ee0886f MW	425	#endif
66b38bc5	426
6ee0886f MW	427	retval = debugfs_create_file("rcugp", 0444,
	428	rspdir, rsp, &rcugp_fops);
	429	if (!retval)
	430	goto free_out;
64db4cff	431
6ee0886f MW	432	retval = debugfs_create_file("rcuhier", 0444,
	433	rspdir, rsp, &rcuhier_fops);
	434	if (!retval)
	435	goto free_out;
	436	}
7ba5c840	437
4a298656 PM	438	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	439	NULL, &rcutorture_fops);
	440	if (!retval)
	441	goto free_out;
64db4cff PM	442	return 0;
64db4cff PM	443	free_out:
22f00b69	444	debugfs_remove_recursive(rcudir);
64db4cff PM	445	return 1;
	446	}
	447
deb7a418	448	static void __exit rcutree_trace_cleanup(void)
64db4cff	449	{
22f00b69	450	debugfs_remove_recursive(rcudir);
64db4cff PM	451	}
	452
	453
deb7a418 PM	454	module_init(rcutree_trace_init);
deb7a418 PM	455	module_exit(rcutree_trace_cleanup);
64db4cff PM	456
	457	MODULE_AUTHOR("Paul E. McKenney");
	458	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	459	MODULE_LICENSE("GPL");