[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 <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(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/%d df=%lu",
		   atomic_read(&rdp->dynticks->dynticks),
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi_nesting,
		   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 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),
		   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",
		   atomic_read(&rdp->dynticks->dynticks),
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi_nesting,
		   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\",\"dt NMI nesting\",\"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);
d71df90e PM	51	DECLARE_PER_CPU(char, rcu_cpu_has_work);
	52
	53	static char convert_kthread_status(unsigned int kthread_status)
	54	{
	55	if (kthread_status > RCU_KTHREAD_MAX)
	56	return '?';
15ba0ba8	57	return "SRWOY"[kthread_status];
d71df90e PM	58	}
d71df90e PM	59
64db4cff PM	60	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	61	{
	62	if (!rdp->beenonline)
	63	return;
20133cfc	64	seq_printf(m, "%3d%cc=%lu g=%lu pq=%d pqc=%lu qp=%d",
64db4cff PM	65	rdp->cpu,
	66	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	67	rdp->completed, rdp->gpnum,
	68	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	69	rdp->qs_pending);
64db4cff	70	#ifdef CONFIG_NO_HZ
e59fb312 PM	71	seq_printf(m, " dt=%d/%d/%d df=%lu",
e59fb312 PM	72	atomic_read(&rdp->dynticks->dynticks),
64db4cff	73	rdp->dynticks->dynticks_nesting,
e59fb312	74	rdp->dynticks->dynticks_nmi_nesting,
64db4cff PM	75	rdp->dynticks_fqs);
	76	#endif /* #ifdef CONFIG_NO_HZ */
	77	seq_printf(m, " of=%lu ri=%lu", rdp->offline_fqs, rdp->resched_ipi);
15ba0ba8	78	seq_printf(m, " ql=%ld qs=%c%c%c%c kt=%d/%c/%d b=%ld",
0ac3d136 PM	79	rdp->qlen,
	80	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	81	rdp->nxttail[RCU_NEXT_TAIL]],
	82	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	83	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	84	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	85	rdp->nxttail[RCU_WAIT_TAIL]],
	86	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
d71df90e PM	87	per_cpu(rcu_cpu_has_work, rdp->cpu),
	88	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	89	rdp->cpu)),
15ba0ba8	90	per_cpu(rcu_cpu_kthread_cpu, rdp->cpu),
0ac3d136	91	rdp->blimit);
269dcc1c PM	92	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	93	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	94	}
	95
	96	#define PRINT_RCU_DATA(name, func, m) \
	97	do { \
	98	int _p_r_d_i; \
	99	\
	100	for_each_possible_cpu(_p_r_d_i) \
	101	func(m, &per_cpu(name, _p_r_d_i)); \
	102	} while (0)
	103
	104	static int show_rcudata(struct seq_file m, void unused)
	105	{
f41d911f PM	106	#ifdef CONFIG_TREE_PREEMPT_RCU
	107	seq_puts(m, "rcu_preempt:\n");
	108	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data, m);
	109	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	110	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	111	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data, m);
64db4cff PM	112	seq_puts(m, "rcu_bh:\n");
	113	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data, m);
	114	return 0;
	115	}
	116
	117	static int rcudata_open(struct inode inode, struct file file)
	118	{
	119	return single_open(file, show_rcudata, NULL);
	120	}
	121
9b2619af	122	static const struct file_operations rcudata_fops = {
64db4cff PM	123	.owner = THIS_MODULE,
	124	.open = rcudata_open,
	125	.read = seq_read,
	126	.llseek = seq_lseek,
	127	.release = single_release,
	128	};
	129
	130	static void print_one_rcu_data_csv(struct seq_file m, struct rcu_data rdp)
	131	{
	132	if (!rdp->beenonline)
	133	return;
20133cfc	134	seq_printf(m, "%d,%s,%lu,%lu,%d,%lu,%d",
64db4cff	135	rdp->cpu,
5699ed8f	136	cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
64db4cff PM	137	rdp->completed, rdp->gpnum,
64db4cff PM	138	rdp->passed_quiesc, rdp->passed_quiesc_completed,
ef631b0c	139	rdp->qs_pending);
64db4cff PM	140	#ifdef CONFIG_NO_HZ
64db4cff PM	141	seq_printf(m, ",%d,%d,%d,%lu",
e59fb312	142	atomic_read(&rdp->dynticks->dynticks),
64db4cff	143	rdp->dynticks->dynticks_nesting,
e59fb312	144	rdp->dynticks->dynticks_nmi_nesting,
64db4cff PM	145	rdp->dynticks_fqs);
	146	#endif /* #ifdef CONFIG_NO_HZ */
	147	seq_printf(m, ",%lu,%lu", rdp->offline_fqs, rdp->resched_ipi);
d71df90e	148	seq_printf(m, ",%ld,\"%c%c%c%c\",%d,\"%c\",%ld", rdp->qlen,
0ac3d136 PM	149	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	150	rdp->nxttail[RCU_NEXT_TAIL]],
	151	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	152	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	153	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	154	rdp->nxttail[RCU_WAIT_TAIL]],
	155	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]],
d71df90e PM	156	per_cpu(rcu_cpu_has_work, rdp->cpu),
	157	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	158	rdp->cpu)),
0ac3d136	159	rdp->blimit);
269dcc1c PM	160	seq_printf(m, ",%lu,%lu,%lu\n",
269dcc1c PM	161	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	162	}
	163
	164	static int show_rcudata_csv(struct seq_file m, void unused)
	165	{
ef631b0c	166	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pqc\",\"pq\",");
64db4cff	167	#ifdef CONFIG_NO_HZ
e59fb312	168	seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
64db4cff	169	#endif /* #ifdef CONFIG_NO_HZ */
269dcc1c	170	seq_puts(m, "\"of\",\"ri\",\"ql\",\"b\",\"ci\",\"co\",\"ca\"\n");
f41d911f PM	171	#ifdef CONFIG_TREE_PREEMPT_RCU
	172	seq_puts(m, "\"rcu_preempt:\"\n");
	173	PRINT_RCU_DATA(rcu_preempt_data, print_one_rcu_data_csv, m);
	174	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	175	seq_puts(m, "\"rcu_sched:\"\n");
d6714c22 PM	176	PRINT_RCU_DATA(rcu_sched_data, print_one_rcu_data_csv, m);
64db4cff PM	177	seq_puts(m, "\"rcu_bh:\"\n");
	178	PRINT_RCU_DATA(rcu_bh_data, print_one_rcu_data_csv, m);
	179	return 0;
	180	}
	181
	182	static int rcudata_csv_open(struct inode inode, struct file file)
	183	{
	184	return single_open(file, show_rcudata_csv, NULL);
	185	}
	186
9b2619af	187	static const struct file_operations rcudata_csv_fops = {
64db4cff PM	188	.owner = THIS_MODULE,
	189	.open = rcudata_csv_open,
	190	.read = seq_read,
	191	.llseek = seq_lseek,
	192	.release = single_release,
	193	};
	194
0ea1f2eb PM	195	#ifdef CONFIG_RCU_BOOST
	196
	197	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	198	{
d71df90e	199	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu "
0ea1f2eb PM	200	"j=%04x bt=%04x\n",
	201	rnp->grplo, rnp->grphi,
	202	"T."[list_empty(&rnp->blkd_tasks)],
	203	"N."[!rnp->gp_tasks],
	204	"E."[!rnp->exp_tasks],
	205	"B."[!rnp->boost_tasks],
d71df90e	206	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb PM	207	rnp->n_tasks_boosted, rnp->n_exp_boosts,
	208	rnp->n_normal_boosts,
	209	(int)(jiffies & 0xffff),
	210	(int)(rnp->boost_time & 0xffff));
	211	seq_printf(m, "%s: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
	212	" balk",
	213	rnp->n_balk_blkd_tasks,
	214	rnp->n_balk_exp_gp_tasks,
	215	rnp->n_balk_boost_tasks,
	216	rnp->n_balk_notblocked,
	217	rnp->n_balk_notyet,
	218	rnp->n_balk_nos);
	219	}
	220
	221	static int show_rcu_node_boost(struct seq_file m, void unused)
	222	{
	223	struct rcu_node *rnp;
	224
	225	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	226	print_one_rcu_node_boost(m, rnp);
	227	return 0;
	228	}
	229
	230	static int rcu_node_boost_open(struct inode inode, struct file file)
	231	{
	232	return single_open(file, show_rcu_node_boost, NULL);
	233	}
	234
	235	static const struct file_operations rcu_node_boost_fops = {
	236	.owner = THIS_MODULE,
	237	.open = rcu_node_boost_open,
	238	.read = seq_read,
	239	.llseek = seq_lseek,
	240	.release = single_release,
	241	};
	242
	243	/*
	244	* Create the rcuboost debugfs entry. Standard error return.
	245	*/
	246	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	247	{
	248	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
	249	&rcu_node_boost_fops);
	250	}
	251
	252	#else /* #ifdef CONFIG_RCU_BOOST */
	253
	254	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	255	{
	256	return 0; /* There cannot be an error if we didn't create it! */
	257	}
	258
	259	#endif /* #else #ifdef CONFIG_RCU_BOOST */
	260
64db4cff PM	261	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	262	{
20133cfc	263	unsigned long gpnum;
64db4cff PM	264	int level = 0;
	265	struct rcu_node *rnp;
	266
3397e040	267	gpnum = rsp->gpnum;
20133cfc	268	seq_printf(m, "c=%lu g=%lu s=%d jfq=%ld j=%x "
29494be7	269	"nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu\n",
3397e040	270	rsp->completed, gpnum, rsp->signaled,
64db4cff PM	271	(long)(rsp->jiffies_force_qs - jiffies),
	272	(int)(jiffies & 0xffff),
	273	rsp->n_force_qs, rsp->n_force_qs_ngp,
	274	rsp->n_force_qs - rsp->n_force_qs_ngp,
29494be7	275	rsp->n_force_qs_lh);
64db4cff PM	276	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < NUM_RCU_NODES; rnp++) {
	277	if (rnp->level != level) {
	278	seq_puts(m, "\n");
	279	level = rnp->level;
	280	}
12f5f524	281	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	282	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	283	".G"[rnp->gp_tasks != NULL],
	284	".E"[rnp->exp_tasks != NULL],
	285	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	286	rnp->grplo, rnp->grphi, rnp->grpnum);
	287	}
	288	seq_puts(m, "\n");
	289	}
	290
	291	static int show_rcuhier(struct seq_file m, void unused)
	292	{
f41d911f PM	293	#ifdef CONFIG_TREE_PREEMPT_RCU
	294	seq_puts(m, "rcu_preempt:\n");
	295	print_one_rcu_state(m, &rcu_preempt_state);
	296	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	297	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	298	print_one_rcu_state(m, &rcu_sched_state);
64db4cff PM	299	seq_puts(m, "rcu_bh:\n");
	300	print_one_rcu_state(m, &rcu_bh_state);
	301	return 0;
	302	}
	303
	304	static int rcuhier_open(struct inode inode, struct file file)
	305	{
	306	return single_open(file, show_rcuhier, NULL);
	307	}
	308
9b2619af	309	static const struct file_operations rcuhier_fops = {
64db4cff PM	310	.owner = THIS_MODULE,
	311	.open = rcuhier_open,
	312	.read = seq_read,
	313	.llseek = seq_lseek,
	314	.release = single_release,
	315	};
	316
15ba0ba8 PM	317	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	318	{
	319	unsigned long flags;
	320	unsigned long completed;
	321	unsigned long gpnum;
	322	unsigned long gpage;
	323	unsigned long gpmax;
	324	struct rcu_node *rnp = &rsp->node[0];
	325
	326	raw_spin_lock_irqsave(&rnp->lock, flags);
	327	completed = rsp->completed;
	328	gpnum = rsp->gpnum;
	329	if (rsp->completed == rsp->gpnum)
	330	gpage = 0;
	331	else
	332	gpage = jiffies - rsp->gp_start;
	333	gpmax = rsp->gp_max;
	334	raw_spin_unlock_irqrestore(&rnp->lock, flags);
	335	seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
	336	rsp->name, completed, gpnum, gpage, gpmax);
	337	}
	338
64db4cff PM	339	static int show_rcugp(struct seq_file m, void unused)
64db4cff PM	340	{
f41d911f	341	#ifdef CONFIG_TREE_PREEMPT_RCU
15ba0ba8	342	show_one_rcugp(m, &rcu_preempt_state);
f41d911f	343	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
15ba0ba8 PM	344	show_one_rcugp(m, &rcu_sched_state);
15ba0ba8 PM	345	show_one_rcugp(m, &rcu_bh_state);
64db4cff PM	346	return 0;
	347	}
	348
	349	static int rcugp_open(struct inode inode, struct file file)
	350	{
	351	return single_open(file, show_rcugp, NULL);
	352	}
	353
9b2619af	354	static const struct file_operations rcugp_fops = {
64db4cff PM	355	.owner = THIS_MODULE,
	356	.open = rcugp_open,
	357	.read = seq_read,
	358	.llseek = seq_lseek,
	359	.release = single_release,
	360	};
	361
7ba5c840 PM	362	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
	363	{
	364	seq_printf(m, "%3d%cnp=%ld "
d21670ac PM	365	"qsp=%ld rpq=%ld cbr=%ld cng=%ld "
d21670ac PM	366	"gpc=%ld gps=%ld nf=%ld nn=%ld\n",
7ba5c840 PM	367	rdp->cpu,
	368	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	369	rdp->n_rcu_pending,
	370	rdp->n_rp_qs_pending,
d21670ac	371	rdp->n_rp_report_qs,
7ba5c840 PM	372	rdp->n_rp_cb_ready,
	373	rdp->n_rp_cpu_needs_gp,
	374	rdp->n_rp_gp_completed,
	375	rdp->n_rp_gp_started,
	376	rdp->n_rp_need_fqs,
	377	rdp->n_rp_need_nothing);
	378	}
	379
	380	static void print_rcu_pendings(struct seq_file m, struct rcu_state rsp)
	381	{
	382	int cpu;
	383	struct rcu_data *rdp;
	384
	385	for_each_possible_cpu(cpu) {
394f99a9	386	rdp = per_cpu_ptr(rsp->rda, cpu);
7ba5c840 PM	387	if (rdp->beenonline)
	388	print_one_rcu_pending(m, rdp);
	389	}
	390	}
	391
	392	static int show_rcu_pending(struct seq_file m, void unused)
	393	{
f41d911f PM	394	#ifdef CONFIG_TREE_PREEMPT_RCU
	395	seq_puts(m, "rcu_preempt:\n");
	396	print_rcu_pendings(m, &rcu_preempt_state);
	397	#endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */
d6714c22 PM	398	seq_puts(m, "rcu_sched:\n");
d6714c22 PM	399	print_rcu_pendings(m, &rcu_sched_state);
7ba5c840 PM	400	seq_puts(m, "rcu_bh:\n");
	401	print_rcu_pendings(m, &rcu_bh_state);
	402	return 0;
	403	}
	404
	405	static int rcu_pending_open(struct inode inode, struct file file)
	406	{
	407	return single_open(file, show_rcu_pending, NULL);
	408	}
	409
9b2619af	410	static const struct file_operations rcu_pending_fops = {
7ba5c840 PM	411	.owner = THIS_MODULE,
	412	.open = rcu_pending_open,
	413	.read = seq_read,
	414	.llseek = seq_lseek,
	415	.release = single_release,
	416	};
	417
4a298656 PM	418	static int show_rcutorture(struct seq_file m, void unused)
	419	{
	420	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	421	rcutorture_testseq >> 1,
	422	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	423	seq_printf(m, "rcutorture update version number: %lu\n",
	424	rcutorture_vernum);
	425	return 0;
	426	}
	427
	428	static int rcutorture_open(struct inode inode, struct file file)
	429	{
	430	return single_open(file, show_rcutorture, NULL);
	431	}
	432
	433	static const struct file_operations rcutorture_fops = {
	434	.owner = THIS_MODULE,
	435	.open = rcutorture_open,
	436	.read = seq_read,
	437	.llseek = seq_lseek,
	438	.release = single_release,
	439	};
	440
7ba5c840	441	static struct dentry *rcudir;
7ba5c840	442
deb7a418	443	static int __init rcutree_trace_init(void)
64db4cff	444	{
22f00b69 PM	445	struct dentry *retval;
22f00b69 PM	446
64db4cff PM	447	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	448	if (!rcudir)
22f00b69	449	goto free_out;
64db4cff	450
22f00b69	451	retval = debugfs_create_file("rcudata", 0444, rcudir,
64db4cff	452	NULL, &rcudata_fops);
22f00b69	453	if (!retval)
64db4cff PM	454	goto free_out;
64db4cff PM	455
22f00b69	456	retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
64db4cff	457	NULL, &rcudata_csv_fops);
22f00b69	458	if (!retval)
64db4cff PM	459	goto free_out;
64db4cff PM	460
0ea1f2eb PM	461	if (rcu_boost_trace_create_file(rcudir))
	462	goto free_out;
	463
22f00b69 PM	464	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
22f00b69 PM	465	if (!retval)
64db4cff PM	466	goto free_out;
64db4cff PM	467
22f00b69	468	retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff	469	NULL, &rcuhier_fops);
22f00b69	470	if (!retval)
64db4cff	471	goto free_out;
7ba5c840	472
22f00b69	473	retval = debugfs_create_file("rcu_pending", 0444, rcudir,
7ba5c840	474	NULL, &rcu_pending_fops);
22f00b69	475	if (!retval)
7ba5c840	476	goto free_out;
4a298656 PM	477
	478	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	479	NULL, &rcutorture_fops);
	480	if (!retval)
	481	goto free_out;
64db4cff PM	482	return 0;
64db4cff PM	483	free_out:
22f00b69	484	debugfs_remove_recursive(rcudir);
64db4cff PM	485	return 1;
	486	}
	487
deb7a418	488	static void __exit rcutree_trace_cleanup(void)
64db4cff	489	{
22f00b69	490	debugfs_remove_recursive(rcudir);
64db4cff PM	491	}
	492
	493
deb7a418 PM	494	module_init(rcutree_trace_init);
deb7a418 PM	495	module_exit(rcutree_trace_cleanup);
64db4cff PM	496
	497	MODULE_AUTHOR("Paul E. McKenney");
	498	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	499	MODULE_LICENSE("GPL");