[mirror_ubuntu-artful-kernel.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 <asm/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"

DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_cpu);
DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
DECLARE_PER_CPU(char, rcu_cpu_has_work);

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

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 pqc=%lu qp=%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   rdp->completed, rdp->gpnum,
		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
		   rdp->qs_pending);
#ifdef CONFIG_NO_HZ
	seq_printf(m, " dt=%d/%d dn=%d df=%lu",
		   rdp->dynticks->dynticks,
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi,
		   rdp->dynticks_fqs);
#endif /* #ifdef CONFIG_NO_HZ */
	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
	seq_printf(m, " ql=%ld qs=%c%c%c%c kt=%d/%c/%d ktl=%x b=%ld",
		   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]],
		   per_cpu(rcu_cpu_has_work, rdp->cpu),
		   convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
					  rdp->cpu)),
		   per_cpu(rcu_cpu_kthread_cpu, rdp->cpu),
		   per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff,
		   rdp->blimit);
	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
		   rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
}

#define PRINT_RCU_DATA(name, func, m) \
	do { \
		int _p_r_d_i; \
		\
		for_each_possible_cpu(_p_r_d_i) \
			func(m, &per_cpu(name, _p_r_d_i)); \
	} while (0)

static int show_rcudata(struct seq_file *m, void *unused)
{
#ifdef CONFIG_TREE_PREEMPT_RCU
	seq_puts(m, "rcu_preempt:\n");
	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
	seq_puts(m, "rcu_sched:\n");
	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
	seq_puts(m, "rcu_bh:\n");
	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
	return 0;
}

static int rcudata_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcudata, NULL);
}

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

static void print_one_rcu_data_csv(struct seq_file *m, struct rcu_data *rdp)
{
	if (!rdp->beenonline)
		return;
	seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
		   rdp->completed, rdp->gpnum,
		   rdp->passed_quiesc, rdp->passed_quiesc_completed,
		   rdp->qs_pending);
#ifdef CONFIG_NO_HZ
	seq_printf(m, ",%d,%d,%d,%lu",
		   rdp->dynticks->dynticks,
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi,
		   rdp->dynticks_fqs);
#endif /* #ifdef CONFIG_NO_HZ */
	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
	seq_printf(m, ",%ld,\"%c%c%c%c\",%d,\"%c\",%ld", 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]],
		   per_cpu(rcu_cpu_has_work, rdp->cpu),
		   convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
					  rdp->cpu)),
		   rdp->blimit);
	seq_printf(m, ",%lu,%lu,%lu\n",
		   rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
}

static int show_rcudata_csv(struct seq_file *m, void *unused)
{
	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
#ifdef CONFIG_NO_HZ
	seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
#endif /* #ifdef CONFIG_NO_HZ */
	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
#ifdef CONFIG_TREE_PREEMPT_RCU
	seq_puts(m, "\"rcu_preempt:\"\n");
	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
	seq_puts(m, "\"rcu_sched:\"\n");
	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
	seq_puts(m, "\"rcu_bh:\"\n");
	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
	return 0;
}

static int rcudata_csv_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcudata_csv, NULL);
}

static const struct file_operations rcudata_csv_fops = {
	.owner = THIS_MODULE,
	.open = rcudata_csv_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.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 "
		   "j=%04x bt=%04x\n",
		   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,
		   (int)(jiffies & 0xffff),
		   (int)(rnp->boost_time & 0xffff));
	seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
		   "     balk",
		   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, "c=%lu g=%lu s=%d jfq=%ld j=%x "
		      "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
		   rsp->completed, gpnum, rsp->signaled,
		   (long)(rsp->jiffies_force_qs - jiffies),
		   (int)(jiffies & 0xffff),
		   rsp->n_force_qs, rsp->n_force_qs_ngp,
		   rsp->n_force_qs - rsp->n_force_qs_ngp,
		   rsp->n_force_qs_lh);
	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_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)
{
#ifdef CONFIG_TREE_PREEMPT_RCU
	seq_puts(m, "rcu_preempt:\n");
	print_one_rcu_state(m, &rcu_preempt_state);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
	seq_puts(m, "rcu_sched:\n");
	print_one_rcu_state(m, &rcu_sched_state);
	seq_puts(m, "rcu_bh:\n");
	print_one_rcu_state(m, &rcu_bh_state);
	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)
{
#ifdef CONFIG_TREE_PREEMPT_RCU
	show_one_rcugp(m, &rcu_preempt_state);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
	show_one_rcugp(m, &rcu_sched_state);
	show_one_rcugp(m, &rcu_bh_state);
	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)
{
	seq_printf(m, "%3d%cnp=%ld "
		   "qsp=%ld rpq=%ld cbr=%ld cng=%ld "
		   "gpc=%ld gps=%ld nf=%ld nn=%ld\n",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? '!' : ' ',
		   rdp->n_rcu_pending,
		   rdp->n_rp_qs_pending,
		   rdp->n_rp_report_qs,
		   rdp->n_rp_cb_ready,
		   rdp->n_rp_cpu_needs_gp,
		   rdp->n_rp_gp_completed,
		   rdp->n_rp_gp_started,
		   rdp->n_rp_need_fqs,
		   rdp->n_rp_need_nothing);
}

static void print_rcu_pendings(struct seq_file *m, struct rcu_state *rsp)
{
	int cpu;
	struct rcu_data *rdp;

	for_each_possible_cpu(cpu) {
		rdp = per_cpu_ptr(rsp->rda, cpu);
		if (rdp->beenonline)
			print_one_rcu_pending(m, rdp);
	}
}

static int show_rcu_pending(struct seq_file *m, void *unused)
{
#ifdef CONFIG_TREE_PREEMPT_RCU
	seq_puts(m, "rcu_preempt:\n");
	print_rcu_pendings(m, &rcu_preempt_state);
#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
	seq_puts(m, "rcu_sched:\n");
	print_rcu_pendings(m, &rcu_sched_state);
	seq_puts(m, "rcu_bh:\n");
	print_rcu_pendings(m, &rcu_bh_state);
	return 0;
}

static int rcu_pending_open(struct inode *inode, struct file *file)
{
	return single_open(file, show_rcu_pending, NULL);
}

static const struct file_operations rcu_pending_fops = {
	.owner = THIS_MODULE,
	.open = rcu_pending_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_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 dentry *retval;

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

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

	retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
						NULL, &rcudata_csv_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("rcu_pending", 0444, rcudir,
						NULL, &rcu_pending_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>
	34	#include <asm/atomic.h>
	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
d71df90e	49	DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_status);
15ba0ba8	50	DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_cpu);
5ece5bab	51	DECLARE_PER_CPU(unsigned int, rcu_cpu_kthread_loops);
d71df90e PM	52	DECLARE_PER_CPU(char, rcu_cpu_has_work);
	53
	54	static char convert_kthread_status(unsigned int kthread_status)
	55	{
	56	if (kthread_status > RCU_KTHREAD_MAX)
	57	return '?';
15ba0ba8	58	return "SRWOY"[kthread_status];
d71df90e PM	59	}
d71df90e PM	60
64db4cff PM	61	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	62	{
	63	if (!rdp->beenonline)
	64	return;
20133cfc	65	seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
64db4cff PM	66	rdp->cpu,
	67	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	68	rdp->completed, rdp->gpnum,
	69	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	70	rdp->qs_pending);
64db4cff	71	#ifdef CONFIG_NO_HZ
80d02085 PM	72	seq_printf(m, " dt=%d/%d dn=%d df=%lu",
80d02085 PM	73	rdp->dynticks->dynticks,
64db4cff	74	rdp->dynticks->dynticks_nesting,
80d02085	75	rdp->dynticks->dynticks_nmi,
64db4cff PM	76	rdp->dynticks_fqs);
	77	#endif /* #ifdef CONFIG_NO_HZ */
	78	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
5ece5bab	79	seq_printf(m, " ql=%ld qs=%c%c%c%c kt=%d/%c/%d ktl=%x b=%ld",
0ac3d136 PM	80	rdp->qlen,
	81	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	82	rdp->nxttail[RCU_NEXT_TAIL]],
	83	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	84	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	85	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	86	rdp->nxttail[RCU_WAIT_TAIL]],
	87	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
d71df90e PM	88	per_cpu(rcu_cpu_has_work, rdp->cpu),
	89	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	90	rdp->cpu)),
15ba0ba8	91	per_cpu(rcu_cpu_kthread_cpu, rdp->cpu),
5ece5bab	92	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff,
0ac3d136	93	rdp->blimit);
269dcc1c PM	94	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	95	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	96	}
	97
	98	#define PRINT_RCU_DATA(name, func, m) \
	99	do { \
	100	int _p_r_d_i; \
	101	\
	102	for_each_possible_cpu(_p_r_d_i) \
	103	func(m, &per_cpu(name, _p_r_d_i)); \
	104	} while (0)
	105
	106	static int show_rcudata(struct seq_file m, void unused)
	107	{
f41d911f PM	108	#ifdef CONFIG_TREE_PREEMPT_RCU
	109	seq_puts(m, "rcu_preempt:\n");
	110	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
	111	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	112	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	113	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
64db4cff PM	114	seq_puts(m, "rcu_bh:\n");
	115	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
	116	return 0;
	117	}
	118
	119	static int rcudata_open(struct inode inode, struct file file)
	120	{
	121	return single_open(file, show_rcudata, NULL);
	122	}
	123
9b2619af	124	static const struct file_operations rcudata_fops = {
64db4cff PM	125	.owner = THIS_MODULE,
	126	.open = rcudata_open,
	127	.read = seq_read,
	128	.llseek = seq_lseek,
	129	.release = single_release,
	130	};
	131
	132	static void print_one_rcu_data_csv(struct seq_file m, struct rcu_data rdp)
	133	{
	134	if (!rdp->beenonline)
	135	return;
20133cfc	136	seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
64db4cff	137	rdp->cpu,
5699ed8f	138	cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
64db4cff PM	139	rdp->completed, rdp->gpnum,
64db4cff PM	140	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	141	rdp->qs_pending);
64db4cff PM	142	#ifdef CONFIG_NO_HZ
64db4cff PM	143	seq_printf(m, ",%d,%d,%d,%lu",
80d02085	144	rdp->dynticks->dynticks,
64db4cff	145	rdp->dynticks->dynticks_nesting,
80d02085	146	rdp->dynticks->dynticks_nmi,
64db4cff PM	147	rdp->dynticks_fqs);
	148	#endif /* #ifdef CONFIG_NO_HZ */
	149	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
d71df90e	150	seq_printf(m, ",%ld,\"%c%c%c%c\",%d,\"%c\",%ld", rdp->qlen,
0ac3d136 PM	151	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	152	rdp->nxttail[RCU_NEXT_TAIL]],
	153	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	154	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	155	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	156	rdp->nxttail[RCU_WAIT_TAIL]],
	157	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
d71df90e PM	158	per_cpu(rcu_cpu_has_work, rdp->cpu),
	159	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	160	rdp->cpu)),
0ac3d136	161	rdp->blimit);
269dcc1c PM	162	seq_printf(m, ",%lu,%lu,%lu\n",
269dcc1c PM	163	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	164	}
	165
	166	static int show_rcudata_csv(struct seq_file m, void unused)
	167	{
ef631b0c	168	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
64db4cff	169	#ifdef CONFIG_NO_HZ
80d02085	170	seq_puts(m, "\"dt\",\"dt nesting\",\"dn\",\"df\",");
64db4cff	171	#endif /* #ifdef CONFIG_NO_HZ */
269dcc1c	172	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
f41d911f PM	173	#ifdef CONFIG_TREE_PREEMPT_RCU
	174	seq_puts(m, "\"rcu_preempt:\"\n");
	175	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
	176	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	177	seq_puts(m, "\"rcu_sched:\"\n");
d6714c22 PM	178	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
64db4cff PM	179	seq_puts(m, "\"rcu_bh:\"\n");
	180	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
	181	return 0;
	182	}
	183
	184	static int rcudata_csv_open(struct inode inode, struct file file)
	185	{
	186	return single_open(file, show_rcudata_csv, NULL);
	187	}
	188
9b2619af	189	static const struct file_operations rcudata_csv_fops = {
64db4cff PM	190	.owner = THIS_MODULE,
	191	.open = rcudata_csv_open,
	192	.read = seq_read,
	193	.llseek = seq_lseek,
	194	.release = single_release,
	195	};
	196
0ea1f2eb PM	197	#ifdef CONFIG_RCU_BOOST
	198
	199	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	200	{
d71df90e	201	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu "
0ea1f2eb PM	202	"j=%04x bt=%04x\n",
	203	rnp->grplo, rnp->grphi,
	204	"T."[list_empty(&rnp->blkd_tasks)],
	205	"N."[!rnp->gp_tasks],
	206	"E."[!rnp->exp_tasks],
	207	"B."[!rnp->boost_tasks],
d71df90e	208	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb PM	209	rnp->n_tasks_boosted, rnp->n_exp_boosts,
	210	rnp->n_normal_boosts,
	211	(int)(jiffies & 0xffff),
	212	(int)(rnp->boost_time & 0xffff));
	213	seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
	214	" balk",
	215	rnp->n_balk_blkd_tasks,
	216	rnp->n_balk_exp_gp_tasks,
	217	rnp->n_balk_boost_tasks,
	218	rnp->n_balk_notblocked,
	219	rnp->n_balk_notyet,
	220	rnp->n_balk_nos);
	221	}
	222
	223	static int show_rcu_node_boost(struct seq_file m, void unused)
	224	{
	225	struct rcu_node *rnp;
	226
	227	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	228	print_one_rcu_node_boost(m, rnp);
	229	return 0;
	230	}
	231
	232	static int rcu_node_boost_open(struct inode inode, struct file file)
	233	{
	234	return single_open(file, show_rcu_node_boost, NULL);
	235	}
	236
	237	static const struct file_operations rcu_node_boost_fops = {
	238	.owner = THIS_MODULE,
	239	.open = rcu_node_boost_open,
	240	.read = seq_read,
	241	.llseek = seq_lseek,
	242	.release = single_release,
	243	};
	244
	245	/*
	246	* Create the rcuboost debugfs entry. Standard error return.
	247	*/
	248	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	249	{
	250	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
	251	&rcu_node_boost_fops);
	252	}
	253
	254	#else /* #ifdef CONFIG_RCU_BOOST */
	255
	256	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	257	{
	258	return 0; /* There cannot be an error if we didn't create it! */
	259	}
	260
	261	#endif /* #else #ifdef CONFIG_RCU_BOOST */
	262
64db4cff PM	263	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	264	{
20133cfc	265	unsigned long gpnum;
64db4cff PM	266	int level = 0;
	267	struct rcu_node *rnp;
	268
3397e040	269	gpnum = rsp->gpnum;
20133cfc	270	seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
29494be7	271	"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
3397e040	272	rsp->completed, gpnum, rsp->signaled,
64db4cff PM	273	(long)(rsp->jiffies_force_qs - jiffies),
	274	(int)(jiffies & 0xffff),
	275	rsp->n_force_qs, rsp->n_force_qs_ngp,
	276	rsp->n_force_qs - rsp->n_force_qs_ngp,
29494be7	277	rsp->n_force_qs_lh);
64db4cff PM	278	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
	279	if (rnp->level != level) {
	280	seq_puts(m, "\n");
	281	level = rnp->level;
	282	}
12f5f524	283	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	284	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	285	".G"[rnp->gp_tasks != NULL],
	286	".E"[rnp->exp_tasks != NULL],
	287	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	288	rnp->grplo, rnp->grphi, rnp->grpnum);
	289	}
	290	seq_puts(m, "\n");
	291	}
	292
	293	static int show_rcuhier(struct seq_file m, void unused)
	294	{
f41d911f PM	295	#ifdef CONFIG_TREE_PREEMPT_RCU
	296	seq_puts(m, "rcu_preempt:\n");
	297	print_one_rcu_state(m, &rcu_preempt_state);
	298	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	299	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	300	print_one_rcu_state(m, &rcu_sched_state);
64db4cff PM	301	seq_puts(m, "rcu_bh:\n");
	302	print_one_rcu_state(m, &rcu_bh_state);
	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);
	329	completed = rsp->completed;
	330	gpnum = rsp->gpnum;
	331	if (rsp->completed == rsp->gpnum)
	332	gpage = 0;
	333	else
	334	gpage = jiffies - rsp->gp_start;
	335	gpmax = rsp->gp_max;
	336	raw_spin_unlock_irqrestore(&rnp->lock, flags);
	337	seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
	338	rsp->name, completed, gpnum, gpage, gpmax);
	339	}
	340
64db4cff PM	341	static int show_rcugp(struct seq_file m, void unused)
64db4cff PM	342	{
f41d911f	343	#ifdef CONFIG_TREE_PREEMPT_RCU
15ba0ba8	344	show_one_rcugp(m, &rcu_preempt_state);
f41d911f	345	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
15ba0ba8 PM	346	show_one_rcugp(m, &rcu_sched_state);
15ba0ba8 PM	347	show_one_rcugp(m, &rcu_bh_state);
64db4cff PM	348	return 0;
	349	}
	350
	351	static int rcugp_open(struct inode inode, struct file file)
	352	{
	353	return single_open(file, show_rcugp, NULL);
	354	}
	355
9b2619af	356	static const struct file_operations rcugp_fops = {
64db4cff PM	357	.owner = THIS_MODULE,
	358	.open = rcugp_open,
	359	.read = seq_read,
	360	.llseek = seq_lseek,
	361	.release = single_release,
	362	};
	363
7ba5c840 PM	364	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
	365	{
	366	seq_printf(m, "%3d%cnp=%ld "
d21670ac PM	367	"qsp=%ld rpq=%ld cbr=%ld cng=%ld "
d21670ac PM	368	"gpc=%ld gps=%ld nf=%ld nn=%ld\n",
7ba5c840 PM	369	rdp->cpu,
	370	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	371	rdp->n_rcu_pending,
	372	rdp->n_rp_qs_pending,
d21670ac	373	rdp->n_rp_report_qs,
7ba5c840 PM	374	rdp->n_rp_cb_ready,
	375	rdp->n_rp_cpu_needs_gp,
	376	rdp->n_rp_gp_completed,
	377	rdp->n_rp_gp_started,
	378	rdp->n_rp_need_fqs,
	379	rdp->n_rp_need_nothing);
	380	}
	381
	382	static void print_rcu_pendings(struct seq_file m, struct rcu_state rsp)
	383	{
	384	int cpu;
	385	struct rcu_data *rdp;
	386
	387	for_each_possible_cpu(cpu) {
394f99a9	388	rdp = per_cpu_ptr(rsp->rda, cpu);
7ba5c840 PM	389	if (rdp->beenonline)
	390	print_one_rcu_pending(m, rdp);
	391	}
	392	}
	393
	394	static int show_rcu_pending(struct seq_file m, void unused)
	395	{
f41d911f PM	396	#ifdef CONFIG_TREE_PREEMPT_RCU
	397	seq_puts(m, "rcu_preempt:\n");
	398	print_rcu_pendings(m, &rcu_preempt_state);
	399	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	400	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	401	print_rcu_pendings(m, &rcu_sched_state);
7ba5c840 PM	402	seq_puts(m, "rcu_bh:\n");
	403	print_rcu_pendings(m, &rcu_bh_state);
	404	return 0;
	405	}
	406
	407	static int rcu_pending_open(struct inode inode, struct file file)
	408	{
	409	return single_open(file, show_rcu_pending, NULL);
	410	}
	411
9b2619af	412	static const struct file_operations rcu_pending_fops = {
7ba5c840 PM	413	.owner = THIS_MODULE,
	414	.open = rcu_pending_open,
	415	.read = seq_read,
	416	.llseek = seq_lseek,
	417	.release = single_release,
	418	};
	419
4a298656 PM	420	static int show_rcutorture(struct seq_file m, void unused)
	421	{
	422	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	423	rcutorture_testseq >> 1,
	424	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	425	seq_printf(m, "rcutorture update version number: %lu\n",
	426	rcutorture_vernum);
	427	return 0;
	428	}
	429
	430	static int rcutorture_open(struct inode inode, struct file file)
	431	{
	432	return single_open(file, show_rcutorture, NULL);
	433	}
	434
	435	static const struct file_operations rcutorture_fops = {
	436	.owner = THIS_MODULE,
	437	.open = rcutorture_open,
	438	.read = seq_read,
	439	.llseek = seq_lseek,
	440	.release = single_release,
	441	};
	442
7ba5c840	443	static struct dentry *rcudir;
7ba5c840	444
deb7a418	445	static int __init rcutree_trace_init(void)
64db4cff	446	{
22f00b69 PM	447	struct dentry *retval;
22f00b69 PM	448
64db4cff PM	449	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	450	if (!rcudir)
22f00b69	451	goto free_out;
64db4cff	452
22f00b69	453	retval = debugfs_create_file("rcudata", 0444, rcudir,
64db4cff	454	NULL, &rcudata_fops);
22f00b69	455	if (!retval)
64db4cff PM	456	goto free_out;
64db4cff PM	457
22f00b69	458	retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
64db4cff	459	NULL, &rcudata_csv_fops);
22f00b69	460	if (!retval)
64db4cff PM	461	goto free_out;
64db4cff PM	462
0ea1f2eb PM	463	if (rcu_boost_trace_create_file(rcudir))
	464	goto free_out;
	465
22f00b69 PM	466	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
22f00b69 PM	467	if (!retval)
64db4cff PM	468	goto free_out;
64db4cff PM	469
22f00b69	470	retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff	471	NULL, &rcuhier_fops);
22f00b69	472	if (!retval)
64db4cff	473	goto free_out;
7ba5c840	474
22f00b69	475	retval = debugfs_create_file("rcu_pending", 0444, rcudir,
7ba5c840	476	NULL, &rcu_pending_fops);
22f00b69	477	if (!retval)
7ba5c840	478	goto free_out;
4a298656 PM	479
	480	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	481	NULL, &rcutorture_fops);
	482	if (!retval)
	483	goto free_out;
64db4cff PM	484	return 0;
64db4cff PM	485	free_out:
22f00b69	486	debugfs_remove_recursive(rcudir);
64db4cff PM	487	return 1;
	488	}
	489
deb7a418	490	static void __exit rcutree_trace_cleanup(void)
64db4cff	491	{
22f00b69	492	debugfs_remove_recursive(rcudir);
64db4cff PM	493	}
	494
	495
deb7a418 PM	496	module_init(rcutree_trace_init);
deb7a418 PM	497	module_exit(rcutree_trace_cleanup);
64db4cff PM	498
	499	MODULE_AUTHOR("Paul E. McKenney");
	500	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	501	MODULE_LICENSE("GPL");