[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 *unused)
{
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp)
		seq_printf(m, "%s: bcc: %d nbd: %lu\n",
			   rsp->name,
			   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, NULL);
}

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

static int new_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 new_rcubarrier_open(struct inode *inode, struct file *file)
{
	return single_open(file, new_show_rcubarrier, inode->i_private);
}

static const struct file_operations new_rcubarrier_fops = {
	.owner = THIS_MODULE,
	.open = new_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 = seq_lseek,
	.release = single_release,
};

/*
 * Create the rcuboost debugfs entry.  Standard error return.
 */
static int rcu_boost_trace_create_file(struct dentry *rcudir)
{
	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
				    &rcu_node_boost_fops);
}

#else /* #ifdef CONFIG_RCU_BOOST */

static int rcu_boost_trace_create_file(struct dentry *rcudir)
{
	return 0;  /* There cannot be an error if we didn't create it! */
}

#endif /* #else #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, "%s: c=%ld g=%ld s=%d jfq=%ld j=%x ",
		   rsp->name, 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 *unused)
{
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp)
		print_one_rcu_state(m, rsp);
	return 0;
}

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

static const struct file_operations rcuhier_fops = {
	.owner = THIS_MODULE,
	.open = rcuhier_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.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(&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, "%s: completed=%ld  gpnum=%ld  age=%ld  max=%ld\n",
		   rsp->name, ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
}

static int show_rcugp(struct seq_file *m, void *unused)
{
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp)
		show_one_rcugp(m, rsp);
	return 0;
}

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

static const struct file_operations rcugp_fops = {
	.owner = THIS_MODULE,
	.open = rcugp_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.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_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, &new_rcubarrier_fops);
			if (!retval)
				goto free_out;
	}

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

	if (rcu_boost_trace_create_file(rcudir))
		goto free_out;

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

	retval = debugfs_create_file("rcuhier", 0444, rcudir,
						NULL, &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
d7e187c8 PM	81	static int show_rcubarrier(struct seq_file m, void unused)
d7e187c8 PM	82	{
c0cc962d PM	83	struct rcu_state *rsp;
	84
	85	for_each_rcu_flavor(rsp)
1331e7a1 PM	86	seq_printf(m, "%s: bcc: %d nbd: %lu\n",
1331e7a1 PM	87	rsp->name,
c0cc962d PM	88	atomic_read(&rsp->barrier_cpu_count),
c0cc962d PM	89	rsp->n_barrier_done);
d7e187c8 PM	90	return 0;
	91	}
	92
	93	static int rcubarrier_open(struct inode inode, struct file file)
	94	{
	95	return single_open(file, show_rcubarrier, NULL);
	96	}
	97
	98	static const struct file_operations rcubarrier_fops = {
	99	.owner = THIS_MODULE,
	100	.open = rcubarrier_open,
	101	.read = seq_read,
	102	.llseek = seq_lseek,
	103	.release = single_release,
	104	};
	105
c25e557f MW	106	static int new_show_rcubarrier(struct seq_file m, void v)
	107	{
	108	struct rcu_state rsp = (struct rcu_state )m->private;
	109	seq_printf(m, "bcc: %d nbd: %lu\n",
	110	atomic_read(&rsp->barrier_cpu_count),
	111	rsp->n_barrier_done);
	112	return 0;
	113	}
	114
	115	static int new_rcubarrier_open(struct inode inode, struct file file)
	116	{
	117	return single_open(file, new_show_rcubarrier, inode->i_private);
	118	}
	119
	120	static const struct file_operations new_rcubarrier_fops = {
	121	.owner = THIS_MODULE,
	122	.open = new_rcubarrier_open,
	123	.read = seq_read,
	124	.llseek = no_llseek,
	125	.release = seq_release,
	126	};
	127
a46e0899 PM	128	#ifdef CONFIG_RCU_BOOST
a46e0899 PM	129
d71df90e PM	130	static char convert_kthread_status(unsigned int kthread_status)
	131	{
	132	if (kthread_status > RCU_KTHREAD_MAX)
	133	return '?';
15ba0ba8	134	return "SRWOY"[kthread_status];
d71df90e PM	135	}
d71df90e PM	136
a46e0899 PM	137	#endif /* #ifdef CONFIG_RCU_BOOST */
a46e0899 PM	138
64db4cff PM	139	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	140	{
	141	if (!rdp->beenonline)
	142	return;
42c3533e	143	seq_printf(m, "%3d%cc=%ld g=%ld pq=%d qp=%d",
64db4cff PM	144	rdp->cpu,
64db4cff PM	145	cpu_is_offline(rdp->cpu) ? '!' : ' ',
42c3533e	146	ulong2long(rdp->completed), ulong2long(rdp->gpnum),
d7d6a11e	147	rdp->passed_quiesce, rdp->qs_pending);
9b2e4f18	148	seq_printf(m, " dt=%d/%llx/%d df=%lu",
23b5c8fa	149	atomic_read(&rdp->dynticks->dynticks),
64db4cff	150	rdp->dynticks->dynticks_nesting,
23b5c8fa	151	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	152	rdp->dynticks_fqs);
2036d94a	153	seq_printf(m, " of=%lu", rdp->offline_fqs);
486e2593 PM	154	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
486e2593 PM	155	rdp->qlen_lazy, rdp->qlen,
0ac3d136 PM	156	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	157	rdp->nxttail[RCU_NEXT_TAIL]],
	158	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	159	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	160	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	161	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	162	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
a46e0899 PM	163	#ifdef CONFIG_RCU_BOOST
62ab7072	164	seq_printf(m, " kt=%d/%c ktl=%x",
d71df90e PM	165	per_cpu(rcu_cpu_has_work, rdp->cpu),
	166	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	167	rdp->cpu)),
a46e0899 PM	168	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
	169	#endif /* #ifdef CONFIG_RCU_BOOST */
	170	seq_printf(m, " b=%ld", rdp->blimit);
269dcc1c PM	171	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	172	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	173	}
64db4cff PM	174
c011c41f	175	static int show_rcudata(struct seq_file m, void v)
878eda72 MW	176	{
	177	print_one_rcu_data(m, (struct rcu_data *)v);
	178	return 0;
	179	}
	180
c011c41f	181	static const struct seq_operations rcudate_op = {
878eda72 MW	182	.start = r_start,
	183	.next = r_next,
	184	.stop = r_stop,
c011c41f	185	.show = show_rcudata,
878eda72 MW	186	};
878eda72 MW	187
c011c41f	188	static int rcudata_open(struct inode inode, struct file file)
878eda72	189	{
c011c41f	190	return r_open(inode, file, &rcudate_op);
878eda72 MW	191	}
878eda72 MW	192
c011c41f	193	static const struct file_operations rcudata_fops = {
878eda72	194	.owner = THIS_MODULE,
c011c41f	195	.open = rcudata_open,
878eda72 MW	196	.read = seq_read,
	197	.llseek = no_llseek,
	198	.release = seq_release,
	199	};
	200
0ea1f2eb PM	201	#ifdef CONFIG_RCU_BOOST
	202
	203	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	204	{
5cf05ad7	205	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
0ea1f2eb PM	206	rnp->grplo, rnp->grphi,
	207	"T."[list_empty(&rnp->blkd_tasks)],
	208	"N."[!rnp->gp_tasks],
	209	"E."[!rnp->exp_tasks],
	210	"B."[!rnp->boost_tasks],
d71df90e	211	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb	212	rnp->n_tasks_boosted, rnp->n_exp_boosts,
5cf05ad7 PM	213	rnp->n_normal_boosts);
5cf05ad7 PM	214	seq_printf(m, "j=%04x bt=%04x\n",
0ea1f2eb PM	215	(int)(jiffies & 0xffff),
0ea1f2eb PM	216	(int)(rnp->boost_time & 0xffff));
5cf05ad7	217	seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
0ea1f2eb PM	218	rnp->n_balk_blkd_tasks,
	219	rnp->n_balk_exp_gp_tasks,
	220	rnp->n_balk_boost_tasks,
	221	rnp->n_balk_notblocked,
	222	rnp->n_balk_notyet,
	223	rnp->n_balk_nos);
	224	}
	225
	226	static int show_rcu_node_boost(struct seq_file m, void unused)
	227	{
	228	struct rcu_node *rnp;
	229
	230	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	231	print_one_rcu_node_boost(m, rnp);
	232	return 0;
	233	}
	234
	235	static int rcu_node_boost_open(struct inode inode, struct file file)
	236	{
	237	return single_open(file, show_rcu_node_boost, NULL);
	238	}
	239
	240	static const struct file_operations rcu_node_boost_fops = {
	241	.owner = THIS_MODULE,
	242	.open = rcu_node_boost_open,
	243	.read = seq_read,
	244	.llseek = seq_lseek,
	245	.release = single_release,
	246	};
	247
	248	/*
	249	* Create the rcuboost debugfs entry. Standard error return.
	250	*/
	251	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	252	{
	253	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
	254	&rcu_node_boost_fops);
	255	}
	256
	257	#else /* #ifdef CONFIG_RCU_BOOST */
	258
	259	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	260	{
	261	return 0; /* There cannot be an error if we didn't create it! */
	262	}
	263
	264	#endif /* #else #ifdef CONFIG_RCU_BOOST */
	265
64db4cff PM	266	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	267	{
20133cfc	268	unsigned long gpnum;
64db4cff PM	269	int level = 0;
	270	struct rcu_node *rnp;
	271
3397e040	272	gpnum = rsp->gpnum;
42c3533e PM	273	seq_printf(m, "%s: c=%ld g=%ld s=%d jfq=%ld j=%x ",
	274	rsp->name, ulong2long(rsp->completed), ulong2long(gpnum),
	275	rsp->fqs_state,
64db4cff	276	(long)(rsp->jiffies_force_qs - jiffies),
5cf05ad7 PM	277	(int)(jiffies & 0xffff));
5cf05ad7 PM	278	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
64db4cff PM	279	rsp->n_force_qs, rsp->n_force_qs_ngp,
64db4cff PM	280	rsp->n_force_qs - rsp->n_force_qs_ngp,
b1420f1c	281	rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
f885b7f2	282	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
64db4cff PM	283	if (rnp->level != level) {
	284	seq_puts(m, "\n");
	285	level = rnp->level;
	286	}
12f5f524	287	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	288	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	289	".G"[rnp->gp_tasks != NULL],
	290	".E"[rnp->exp_tasks != NULL],
	291	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	292	rnp->grplo, rnp->grphi, rnp->grpnum);
	293	}
	294	seq_puts(m, "\n");
	295	}
	296
	297	static int show_rcuhier(struct seq_file m, void unused)
	298	{
c0cc962d PM	299	struct rcu_state *rsp;
	300
	301	for_each_rcu_flavor(rsp)
	302	print_one_rcu_state(m, rsp);
64db4cff PM	303	return 0;
	304	}
	305
	306	static int rcuhier_open(struct inode inode, struct file file)
	307	{
	308	return single_open(file, show_rcuhier, NULL);
	309	}
	310
9b2619af	311	static const struct file_operations rcuhier_fops = {
64db4cff PM	312	.owner = THIS_MODULE,
	313	.open = rcuhier_open,
	314	.read = seq_read,
	315	.llseek = seq_lseek,
	316	.release = single_release,
	317	};
	318
15ba0ba8 PM	319	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	320	{
	321	unsigned long flags;
	322	unsigned long completed;
	323	unsigned long gpnum;
	324	unsigned long gpage;
	325	unsigned long gpmax;
	326	struct rcu_node *rnp = &rsp->node[0];
	327
	328	raw_spin_lock_irqsave(&rnp->lock, flags);
42c3533e PM	329	completed = ACCESS_ONCE(rsp->completed);
	330	gpnum = ACCESS_ONCE(rsp->gpnum);
	331	if (completed == gpnum)
15ba0ba8 PM	332	gpage = 0;
	333	else
	334	gpage = jiffies - rsp->gp_start;
	335	gpmax = rsp->gp_max;
	336	raw_spin_unlock_irqrestore(&rnp->lock, flags);
42c3533e PM	337	seq_printf(m, "%s: completed=%ld gpnum=%ld age=%ld max=%ld\n",
42c3533e PM	338	rsp->name, ulong2long(completed), ulong2long(gpnum), gpage, gpmax);
15ba0ba8 PM	339	}
15ba0ba8 PM	340
64db4cff PM	341	static int show_rcugp(struct seq_file m, void unused)
64db4cff PM	342	{
c0cc962d PM	343	struct rcu_state *rsp;
	344
	345	for_each_rcu_flavor(rsp)
	346	show_one_rcugp(m, rsp);
64db4cff PM	347	return 0;
	348	}
	349
	350	static int rcugp_open(struct inode inode, struct file file)
	351	{
	352	return single_open(file, show_rcugp, NULL);
	353	}
	354
9b2619af	355	static const struct file_operations rcugp_fops = {
64db4cff PM	356	.owner = THIS_MODULE,
	357	.open = rcugp_open,
	358	.read = seq_read,
	359	.llseek = seq_lseek,
	360	.release = single_release,
	361	};
	362
7ba5c840 PM	363	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
7ba5c840 PM	364	{
51d0f16d MW	365	if (!rdp->beenonline)
51d0f16d MW	366	return;
5cf05ad7	367	seq_printf(m, "%3d%cnp=%ld ",
7ba5c840 PM	368	rdp->cpu,
7ba5c840 PM	369	cpu_is_offline(rdp->cpu) ? '!' : ' ',
5cf05ad7 PM	370	rdp->n_rcu_pending);
5cf05ad7 PM	371	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
7ba5c840	372	rdp->n_rp_qs_pending,
d21670ac	373	rdp->n_rp_report_qs,
7ba5c840	374	rdp->n_rp_cb_ready,
5cf05ad7	375	rdp->n_rp_cpu_needs_gp);
4605c014	376	seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
7ba5c840 PM	377	rdp->n_rp_gp_completed,
7ba5c840 PM	378	rdp->n_rp_gp_started,
7ba5c840 PM	379	rdp->n_rp_need_nothing);
	380	}
	381
c011c41f	382	static int show_rcu_pending(struct seq_file m, void v)
51d0f16d MW	383	{
	384	print_one_rcu_pending(m, (struct rcu_data *)v);
	385	return 0;
	386	}
	387
c011c41f	388	static const struct seq_operations rcu_pending_op = {
51d0f16d MW	389	.start = r_start,
	390	.next = r_next,
	391	.stop = r_stop,
c011c41f	392	.show = show_rcu_pending,
51d0f16d MW	393	};
51d0f16d MW	394
c011c41f	395	static int rcu_pending_open(struct inode inode, struct file file)
51d0f16d	396	{
c011c41f	397	return r_open(inode, file, &rcu_pending_op);
51d0f16d MW	398	}
51d0f16d MW	399
c011c41f	400	static const struct file_operations rcu_pending_fops = {
51d0f16d	401	.owner = THIS_MODULE,
c011c41f	402	.open = rcu_pending_open,
51d0f16d MW	403	.read = seq_read,
	404	.llseek = no_llseek,
	405	.release = seq_release,
	406	};
	407
4a298656 PM	408	static int show_rcutorture(struct seq_file m, void unused)
	409	{
	410	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	411	rcutorture_testseq >> 1,
	412	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	413	seq_printf(m, "rcutorture update version number: %lu\n",
	414	rcutorture_vernum);
	415	return 0;
	416	}
	417
	418	static int rcutorture_open(struct inode inode, struct file file)
	419	{
	420	return single_open(file, show_rcutorture, NULL);
	421	}
	422
	423	static const struct file_operations rcutorture_fops = {
	424	.owner = THIS_MODULE,
	425	.open = rcutorture_open,
	426	.read = seq_read,
	427	.llseek = seq_lseek,
	428	.release = single_release,
	429	};
	430
7ba5c840	431	static struct dentry *rcudir;
7ba5c840	432
deb7a418	433	static int __init rcutree_trace_init(void)
64db4cff	434	{
573bcd40	435	struct rcu_state *rsp;
22f00b69	436	struct dentry *retval;
573bcd40	437	struct dentry *rspdir;
22f00b69	438
64db4cff PM	439	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	440	if (!rcudir)
22f00b69	441	goto free_out;
64db4cff	442
573bcd40 MW	443	for_each_rcu_flavor(rsp) {
	444	rspdir = debugfs_create_dir(rsp->name, rcudir);
	445	if (!rspdir)
	446	goto free_out;
878eda72 MW	447
878eda72 MW	448	retval = debugfs_create_file("rcudata", 0444,
c011c41f	449	rspdir, rsp, &rcudata_fops);
878eda72 MW	450	if (!retval)
878eda72 MW	451	goto free_out;
51d0f16d MW	452
51d0f16d MW	453	retval = debugfs_create_file("rcu_pending", 0444,
c011c41f	454	rspdir, rsp, &rcu_pending_fops);
51d0f16d MW	455	if (!retval)
51d0f16d MW	456	goto free_out;
c25e557f MW	457
	458	retval = debugfs_create_file("rcubarrier", 0444,
	459	rspdir, rsp, &new_rcubarrier_fops);
	460	if (!retval)
	461	goto free_out;
573bcd40 MW	462	}
573bcd40 MW	463
d7e187c8 PM	464	retval = debugfs_create_file("rcubarrier", 0444, rcudir,
	465	NULL, &rcubarrier_fops);
	466	if (!retval)
	467	goto free_out;
	468
0ea1f2eb PM	469	if (rcu_boost_trace_create_file(rcudir))
	470	goto free_out;
	471
22f00b69 PM	472	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
22f00b69 PM	473	if (!retval)
64db4cff PM	474	goto free_out;
64db4cff PM	475
22f00b69	476	retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff	477	NULL, &rcuhier_fops);
22f00b69	478	if (!retval)
64db4cff	479	goto free_out;
7ba5c840	480
4a298656 PM	481	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	482	NULL, &rcutorture_fops);
	483	if (!retval)
	484	goto free_out;
64db4cff PM	485	return 0;
64db4cff PM	486	free_out:
22f00b69	487	debugfs_remove_recursive(rcudir);
64db4cff PM	488	return 1;
	489	}
	490
deb7a418	491	static void __exit rcutree_trace_cleanup(void)
64db4cff	492	{
22f00b69	493	debugfs_remove_recursive(rcudir);
64db4cff PM	494	}
	495
	496
deb7a418 PM	497	module_init(rcutree_trace_init);
deb7a418 PM	498	module_exit(rcutree_trace_cleanup);
64db4cff PM	499
	500	MODULE_AUTHOR("Paul E. McKenney");
	501	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	502	MODULE_LICENSE("GPL");