[GitHub/mt8127/android_kernel_alcatel_ttab.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"

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,
};

#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=%lu g=%lu pq=%d qp=%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   rdp->completed, 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=%lu g=%lu s=%d jfq=%ld j=%x ",
		   rsp->name, rsp->completed, 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 = rsp->completed;
	gpnum = rsp->gpnum;
	if (rsp->completed == rsp->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=%lu  age=%ld  max=%ld\n",
		   rsp->name, completed, 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, 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
374b928e MW	49	static int r_open(struct inode inode, struct file file,
	50	const struct seq_operations *op)
	51	{
	52	int ret = seq_open(file, op);
	53	if (!ret) {
	54	struct seq_file m = (struct seq_file )file->private_data;
	55	m->private = inode->i_private;
	56	}
	57	return ret;
	58	}
	59
	60	static void r_start(struct seq_file m, loff_t *pos)
	61	{
	62	struct rcu_state rsp = (struct rcu_state )m->private;
	63	pos = cpumask_next(pos - 1, cpu_possible_mask);
	64	if ((*pos) < nr_cpu_ids)
	65	return per_cpu_ptr(rsp->rda, *pos);
	66	return NULL;
	67	}
	68
	69	static void r_next(struct seq_file m, void v, loff_t pos)
	70	{
	71	(*pos)++;
	72	return r_start(m, pos);
	73	}
	74
	75	static void r_stop(struct seq_file m, void v)
	76	{
	77	}
	78
d7e187c8 PM	79	static int show_rcubarrier(struct seq_file m, void unused)
d7e187c8 PM	80	{
c0cc962d PM	81	struct rcu_state *rsp;
	82
	83	for_each_rcu_flavor(rsp)
1331e7a1 PM	84	seq_printf(m, "%s: bcc: %d nbd: %lu\n",
1331e7a1 PM	85	rsp->name,
c0cc962d PM	86	atomic_read(&rsp->barrier_cpu_count),
c0cc962d PM	87	rsp->n_barrier_done);
d7e187c8 PM	88	return 0;
	89	}
	90
	91	static int rcubarrier_open(struct inode inode, struct file file)
	92	{
	93	return single_open(file, show_rcubarrier, NULL);
	94	}
	95
	96	static const struct file_operations rcubarrier_fops = {
	97	.owner = THIS_MODULE,
	98	.open = rcubarrier_open,
	99	.read = seq_read,
	100	.llseek = seq_lseek,
	101	.release = single_release,
	102	};
	103
a46e0899 PM	104	#ifdef CONFIG_RCU_BOOST
a46e0899 PM	105
d71df90e PM	106	static char convert_kthread_status(unsigned int kthread_status)
	107	{
	108	if (kthread_status > RCU_KTHREAD_MAX)
	109	return '?';
15ba0ba8	110	return "SRWOY"[kthread_status];
d71df90e PM	111	}
d71df90e PM	112
a46e0899 PM	113	#endif /* #ifdef CONFIG_RCU_BOOST */
a46e0899 PM	114
64db4cff PM	115	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	116	{
	117	if (!rdp->beenonline)
	118	return;
d7d6a11e	119	seq_printf(m, "%3d%cc=%lu g=%lu pq=%d qp=%d",
64db4cff PM	120	rdp->cpu,
	121	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	122	rdp->completed, rdp->gpnum,
d7d6a11e	123	rdp->passed_quiesce, rdp->qs_pending);
9b2e4f18	124	seq_printf(m, " dt=%d/%llx/%d df=%lu",
23b5c8fa	125	atomic_read(&rdp->dynticks->dynticks),
64db4cff	126	rdp->dynticks->dynticks_nesting,
23b5c8fa	127	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	128	rdp->dynticks_fqs);
2036d94a	129	seq_printf(m, " of=%lu", rdp->offline_fqs);
486e2593 PM	130	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
486e2593 PM	131	rdp->qlen_lazy, rdp->qlen,
0ac3d136 PM	132	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	133	rdp->nxttail[RCU_NEXT_TAIL]],
	134	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	135	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	136	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	137	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	138	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
a46e0899 PM	139	#ifdef CONFIG_RCU_BOOST
62ab7072	140	seq_printf(m, " kt=%d/%c ktl=%x",
d71df90e PM	141	per_cpu(rcu_cpu_has_work, rdp->cpu),
	142	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	143	rdp->cpu)),
a46e0899 PM	144	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
	145	#endif /* #ifdef CONFIG_RCU_BOOST */
	146	seq_printf(m, " b=%ld", rdp->blimit);
269dcc1c PM	147	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	148	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	149	}
64db4cff PM	150
c011c41f	151	static int show_rcudata(struct seq_file m, void v)
878eda72 MW	152	{
	153	print_one_rcu_data(m, (struct rcu_data *)v);
	154	return 0;
	155	}
	156
c011c41f	157	static const struct seq_operations rcudate_op = {
878eda72 MW	158	.start = r_start,
	159	.next = r_next,
	160	.stop = r_stop,
c011c41f	161	.show = show_rcudata,
878eda72 MW	162	};
878eda72 MW	163
c011c41f	164	static int rcudata_open(struct inode inode, struct file file)
878eda72	165	{
c011c41f	166	return r_open(inode, file, &rcudate_op);
878eda72 MW	167	}
878eda72 MW	168
c011c41f	169	static const struct file_operations rcudata_fops = {
878eda72	170	.owner = THIS_MODULE,
c011c41f	171	.open = rcudata_open,
878eda72 MW	172	.read = seq_read,
	173	.llseek = no_llseek,
	174	.release = seq_release,
	175	};
	176
0ea1f2eb PM	177	#ifdef CONFIG_RCU_BOOST
	178
	179	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	180	{
5cf05ad7	181	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
0ea1f2eb PM	182	rnp->grplo, rnp->grphi,
	183	"T."[list_empty(&rnp->blkd_tasks)],
	184	"N."[!rnp->gp_tasks],
	185	"E."[!rnp->exp_tasks],
	186	"B."[!rnp->boost_tasks],
d71df90e	187	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb	188	rnp->n_tasks_boosted, rnp->n_exp_boosts,
5cf05ad7 PM	189	rnp->n_normal_boosts);
5cf05ad7 PM	190	seq_printf(m, "j=%04x bt=%04x\n",
0ea1f2eb PM	191	(int)(jiffies & 0xffff),
0ea1f2eb PM	192	(int)(rnp->boost_time & 0xffff));
5cf05ad7	193	seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
0ea1f2eb PM	194	rnp->n_balk_blkd_tasks,
	195	rnp->n_balk_exp_gp_tasks,
	196	rnp->n_balk_boost_tasks,
	197	rnp->n_balk_notblocked,
	198	rnp->n_balk_notyet,
	199	rnp->n_balk_nos);
	200	}
	201
	202	static int show_rcu_node_boost(struct seq_file m, void unused)
	203	{
	204	struct rcu_node *rnp;
	205
	206	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	207	print_one_rcu_node_boost(m, rnp);
	208	return 0;
	209	}
	210
	211	static int rcu_node_boost_open(struct inode inode, struct file file)
	212	{
	213	return single_open(file, show_rcu_node_boost, NULL);
	214	}
	215
	216	static const struct file_operations rcu_node_boost_fops = {
	217	.owner = THIS_MODULE,
	218	.open = rcu_node_boost_open,
	219	.read = seq_read,
	220	.llseek = seq_lseek,
	221	.release = single_release,
	222	};
	223
	224	/*
	225	* Create the rcuboost debugfs entry. Standard error return.
	226	*/
	227	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	228	{
	229	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
	230	&rcu_node_boost_fops);
	231	}
	232
	233	#else /* #ifdef CONFIG_RCU_BOOST */
	234
	235	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	236	{
	237	return 0; /* There cannot be an error if we didn't create it! */
	238	}
	239
	240	#endif /* #else #ifdef CONFIG_RCU_BOOST */
	241
64db4cff PM	242	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	243	{
20133cfc	244	unsigned long gpnum;
64db4cff PM	245	int level = 0;
	246	struct rcu_node *rnp;
	247
3397e040	248	gpnum = rsp->gpnum;
5cf05ad7	249	seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ",
c0cc962d	250	rsp->name, rsp->completed, gpnum, rsp->fqs_state,
64db4cff	251	(long)(rsp->jiffies_force_qs - jiffies),
5cf05ad7 PM	252	(int)(jiffies & 0xffff));
5cf05ad7 PM	253	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
64db4cff PM	254	rsp->n_force_qs, rsp->n_force_qs_ngp,
64db4cff PM	255	rsp->n_force_qs - rsp->n_force_qs_ngp,
b1420f1c	256	rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
f885b7f2	257	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
64db4cff PM	258	if (rnp->level != level) {
	259	seq_puts(m, "\n");
	260	level = rnp->level;
	261	}
12f5f524	262	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	263	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	264	".G"[rnp->gp_tasks != NULL],
	265	".E"[rnp->exp_tasks != NULL],
	266	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	267	rnp->grplo, rnp->grphi, rnp->grpnum);
	268	}
	269	seq_puts(m, "\n");
	270	}
	271
	272	static int show_rcuhier(struct seq_file m, void unused)
	273	{
c0cc962d PM	274	struct rcu_state *rsp;
	275
	276	for_each_rcu_flavor(rsp)
	277	print_one_rcu_state(m, rsp);
64db4cff PM	278	return 0;
	279	}
	280
	281	static int rcuhier_open(struct inode inode, struct file file)
	282	{
	283	return single_open(file, show_rcuhier, NULL);
	284	}
	285
9b2619af	286	static const struct file_operations rcuhier_fops = {
64db4cff PM	287	.owner = THIS_MODULE,
	288	.open = rcuhier_open,
	289	.read = seq_read,
	290	.llseek = seq_lseek,
	291	.release = single_release,
	292	};
	293
15ba0ba8 PM	294	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	295	{
	296	unsigned long flags;
	297	unsigned long completed;
	298	unsigned long gpnum;
	299	unsigned long gpage;
	300	unsigned long gpmax;
	301	struct rcu_node *rnp = &rsp->node[0];
	302
	303	raw_spin_lock_irqsave(&rnp->lock, flags);
	304	completed = rsp->completed;
	305	gpnum = rsp->gpnum;
	306	if (rsp->completed == rsp->gpnum)
	307	gpage = 0;
	308	else
	309	gpage = jiffies - rsp->gp_start;
	310	gpmax = rsp->gp_max;
	311	raw_spin_unlock_irqrestore(&rnp->lock, flags);
	312	seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
	313	rsp->name, completed, gpnum, gpage, gpmax);
	314	}
	315
64db4cff PM	316	static int show_rcugp(struct seq_file m, void unused)
64db4cff PM	317	{
c0cc962d PM	318	struct rcu_state *rsp;
	319
	320	for_each_rcu_flavor(rsp)
	321	show_one_rcugp(m, rsp);
64db4cff PM	322	return 0;
	323	}
	324
	325	static int rcugp_open(struct inode inode, struct file file)
	326	{
	327	return single_open(file, show_rcugp, NULL);
	328	}
	329
9b2619af	330	static const struct file_operations rcugp_fops = {
64db4cff PM	331	.owner = THIS_MODULE,
	332	.open = rcugp_open,
	333	.read = seq_read,
	334	.llseek = seq_lseek,
	335	.release = single_release,
	336	};
	337
7ba5c840 PM	338	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
7ba5c840 PM	339	{
51d0f16d MW	340	if (!rdp->beenonline)
51d0f16d MW	341	return;
5cf05ad7	342	seq_printf(m, "%3d%cnp=%ld ",
7ba5c840 PM	343	rdp->cpu,
7ba5c840 PM	344	cpu_is_offline(rdp->cpu) ? '!' : ' ',
5cf05ad7 PM	345	rdp->n_rcu_pending);
5cf05ad7 PM	346	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
7ba5c840	347	rdp->n_rp_qs_pending,
d21670ac	348	rdp->n_rp_report_qs,
7ba5c840	349	rdp->n_rp_cb_ready,
5cf05ad7	350	rdp->n_rp_cpu_needs_gp);
4605c014	351	seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
7ba5c840 PM	352	rdp->n_rp_gp_completed,
7ba5c840 PM	353	rdp->n_rp_gp_started,
7ba5c840 PM	354	rdp->n_rp_need_nothing);
	355	}
	356
c011c41f	357	static int show_rcu_pending(struct seq_file m, void v)
51d0f16d MW	358	{
	359	print_one_rcu_pending(m, (struct rcu_data *)v);
	360	return 0;
	361	}
	362
c011c41f	363	static const struct seq_operations rcu_pending_op = {
51d0f16d MW	364	.start = r_start,
	365	.next = r_next,
	366	.stop = r_stop,
c011c41f	367	.show = show_rcu_pending,
51d0f16d MW	368	};
51d0f16d MW	369
c011c41f	370	static int rcu_pending_open(struct inode inode, struct file file)
51d0f16d	371	{
c011c41f	372	return r_open(inode, file, &rcu_pending_op);
51d0f16d MW	373	}
51d0f16d MW	374
c011c41f	375	static const struct file_operations rcu_pending_fops = {
51d0f16d	376	.owner = THIS_MODULE,
c011c41f	377	.open = rcu_pending_open,
51d0f16d MW	378	.read = seq_read,
	379	.llseek = no_llseek,
	380	.release = seq_release,
	381	};
	382
4a298656 PM	383	static int show_rcutorture(struct seq_file m, void unused)
	384	{
	385	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	386	rcutorture_testseq >> 1,
	387	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	388	seq_printf(m, "rcutorture update version number: %lu\n",
	389	rcutorture_vernum);
	390	return 0;
	391	}
	392
	393	static int rcutorture_open(struct inode inode, struct file file)
	394	{
	395	return single_open(file, show_rcutorture, NULL);
	396	}
	397
	398	static const struct file_operations rcutorture_fops = {
	399	.owner = THIS_MODULE,
	400	.open = rcutorture_open,
	401	.read = seq_read,
	402	.llseek = seq_lseek,
	403	.release = single_release,
	404	};
	405
7ba5c840	406	static struct dentry *rcudir;
7ba5c840	407
deb7a418	408	static int __init rcutree_trace_init(void)
64db4cff	409	{
573bcd40	410	struct rcu_state *rsp;
22f00b69	411	struct dentry *retval;
573bcd40	412	struct dentry *rspdir;
22f00b69	413
64db4cff PM	414	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	415	if (!rcudir)
22f00b69	416	goto free_out;
64db4cff	417
573bcd40 MW	418	for_each_rcu_flavor(rsp) {
	419	rspdir = debugfs_create_dir(rsp->name, rcudir);
	420	if (!rspdir)
	421	goto free_out;
878eda72 MW	422
878eda72 MW	423	retval = debugfs_create_file("rcudata", 0444,
c011c41f	424	rspdir, rsp, &rcudata_fops);
878eda72 MW	425	if (!retval)
878eda72 MW	426	goto free_out;
51d0f16d MW	427
51d0f16d MW	428	retval = debugfs_create_file("rcu_pending", 0444,
c011c41f	429	rspdir, rsp, &rcu_pending_fops);
51d0f16d MW	430	if (!retval)
51d0f16d MW	431	goto free_out;
573bcd40 MW	432	}
573bcd40 MW	433
d7e187c8 PM	434	retval = debugfs_create_file("rcubarrier", 0444, rcudir,
	435	NULL, &rcubarrier_fops);
	436	if (!retval)
	437	goto free_out;
	438
0ea1f2eb PM	439	if (rcu_boost_trace_create_file(rcudir))
	440	goto free_out;
	441
22f00b69 PM	442	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
22f00b69 PM	443	if (!retval)
64db4cff PM	444	goto free_out;
64db4cff PM	445
22f00b69	446	retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff	447	NULL, &rcuhier_fops);
22f00b69	448	if (!retval)
64db4cff	449	goto free_out;
7ba5c840	450
4a298656 PM	451	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	452	NULL, &rcutorture_fops);
	453	if (!retval)
	454	goto free_out;
64db4cff PM	455	return 0;
64db4cff PM	456	free_out:
22f00b69	457	debugfs_remove_recursive(rcudir);
64db4cff PM	458	return 1;
	459	}
	460
deb7a418	461	static void __exit rcutree_trace_cleanup(void)
64db4cff	462	{
22f00b69	463	debugfs_remove_recursive(rcudir);
64db4cff PM	464	}
	465
	466
deb7a418 PM	467	module_init(rcutree_trace_init);
deb7a418 PM	468	module_exit(rcutree_trace_cleanup);
64db4cff PM	469
	470	MODULE_AUTHOR("Paul E. McKenney");
	471	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	472	MODULE_LICENSE("GPL");