[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 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 *unused)
{
	int cpu;
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp) {
		seq_printf(m, "%s:\n", rsp->name);
		for_each_possible_cpu(cpu)
			print_one_rcu_data(m, per_cpu_ptr(rsp->rda, cpu));
	}
	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,%d",
		   rdp->cpu,
		   cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
		   rdp->completed, rdp->gpnum,
		   rdp->passed_quiesce, rdp->qs_pending);
	seq_printf(m, ",%d,%llx,%d,%lu",
		   atomic_read(&rdp->dynticks->dynticks),
		   rdp->dynticks->dynticks_nesting,
		   rdp->dynticks->dynticks_nmi_nesting,
		   rdp->dynticks_fqs);
	seq_printf(m, ",%lu", rdp->offline_fqs);
	seq_printf(m, ",%ld,%ld,\"%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, ",%d,\"%c\"",
		   per_cpu(rcu_cpu_has_work, rdp->cpu),
		   convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
					  rdp->cpu)));
#endif /* #ifdef CONFIG_RCU_BOOST */
	seq_printf(m, ",%ld", 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)
{
	int cpu;
	struct rcu_state *rsp;

	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
	seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
	seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
#ifdef CONFIG_RCU_BOOST
	seq_puts(m, "\"kt\",\"ktl\"");
#endif /* #ifdef CONFIG_RCU_BOOST */
	seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
	for_each_rcu_flavor(rsp) {
		seq_printf(m, "\"%s:\"\n", rsp->name);
		for_each_possible_cpu(cpu)
			print_one_rcu_data_csv(m, per_cpu_ptr(rsp->rda, cpu));
	}
	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 ",
		   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)
{
	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 *unused)
{
	int cpu;
	struct rcu_data *rdp;
	struct rcu_state *rsp;

	for_each_rcu_flavor(rsp) {
		seq_printf(m, "%s:\n", rsp->name);
		for_each_possible_cpu(cpu) {
			rdp = per_cpu_ptr(rsp->rda, cpu);
			if (rdp->beenonline)
				print_one_rcu_pending(m, rdp);
		}
	}
	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("rcubarrier", 0444, rcudir,
						NULL, &rcubarrier_fops);
	if (!retval)
		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>
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
d7e187c8 PM	49	static int show_rcubarrier(struct seq_file m, void unused)
d7e187c8 PM	50	{
c0cc962d PM	51	struct rcu_state *rsp;
	52
	53	for_each_rcu_flavor(rsp)
1331e7a1 PM	54	seq_printf(m, "%s: bcc: %d nbd: %lu\n",
1331e7a1 PM	55	rsp->name,
c0cc962d PM	56	atomic_read(&rsp->barrier_cpu_count),
c0cc962d PM	57	rsp->n_barrier_done);
d7e187c8 PM	58	return 0;
	59	}
	60
	61	static int rcubarrier_open(struct inode inode, struct file file)
	62	{
	63	return single_open(file, show_rcubarrier, NULL);
	64	}
	65
	66	static const struct file_operations rcubarrier_fops = {
	67	.owner = THIS_MODULE,
	68	.open = rcubarrier_open,
	69	.read = seq_read,
	70	.llseek = seq_lseek,
	71	.release = single_release,
	72	};
	73
a46e0899 PM	74	#ifdef CONFIG_RCU_BOOST
a46e0899 PM	75
d71df90e PM	76	static char convert_kthread_status(unsigned int kthread_status)
	77	{
	78	if (kthread_status > RCU_KTHREAD_MAX)
	79	return '?';
15ba0ba8	80	return "SRWOY"[kthread_status];
d71df90e PM	81	}
d71df90e PM	82
a46e0899 PM	83	#endif /* #ifdef CONFIG_RCU_BOOST */
a46e0899 PM	84
64db4cff PM	85	static void print_one_rcu_data(struct seq_file m, struct rcu_data rdp)
	86	{
	87	if (!rdp->beenonline)
	88	return;
d7d6a11e	89	seq_printf(m, "%3d%cc=%lu g=%lu pq=%d qp=%d",
64db4cff PM	90	rdp->cpu,
	91	cpu_is_offline(rdp->cpu) ? '!' : ' ',
	92	rdp->completed, rdp->gpnum,
d7d6a11e	93	rdp->passed_quiesce, rdp->qs_pending);
9b2e4f18	94	seq_printf(m, " dt=%d/%llx/%d df=%lu",
23b5c8fa	95	atomic_read(&rdp->dynticks->dynticks),
64db4cff	96	rdp->dynticks->dynticks_nesting,
23b5c8fa	97	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	98	rdp->dynticks_fqs);
2036d94a	99	seq_printf(m, " of=%lu", rdp->offline_fqs);
486e2593 PM	100	seq_printf(m, " ql=%ld/%ld qs=%c%c%c%c",
486e2593 PM	101	rdp->qlen_lazy, rdp->qlen,
0ac3d136 PM	102	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	103	rdp->nxttail[RCU_NEXT_TAIL]],
	104	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	105	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	106	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	107	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	108	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
a46e0899 PM	109	#ifdef CONFIG_RCU_BOOST
62ab7072	110	seq_printf(m, " kt=%d/%c ktl=%x",
d71df90e PM	111	per_cpu(rcu_cpu_has_work, rdp->cpu),
	112	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
	113	rdp->cpu)),
a46e0899 PM	114	per_cpu(rcu_cpu_kthread_loops, rdp->cpu) & 0xffff);
	115	#endif /* #ifdef CONFIG_RCU_BOOST */
	116	seq_printf(m, " b=%ld", rdp->blimit);
269dcc1c PM	117	seq_printf(m, " ci=%lu co=%lu ca=%lu\n",
269dcc1c PM	118	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	119	}
64db4cff PM	120
64db4cff PM	121	static int show_rcudata(struct seq_file m, void unused)
64db4cff PM	122	{
c0cc962d PM	123	int cpu;
	124	struct rcu_state *rsp;
	125
	126	for_each_rcu_flavor(rsp) {
	127	seq_printf(m, "%s:\n", rsp->name);
	128	for_each_possible_cpu(cpu)
	129	print_one_rcu_data(m, per_cpu_ptr(rsp->rda, cpu));
	130	}
64db4cff PM	131	return 0;
	132	}
	133
	134	static int rcudata_open(struct inode inode, struct file file)
	135	{
	136	return single_open(file, show_rcudata, NULL);
	137	}
	138
9b2619af	139	static const struct file_operations rcudata_fops = {
64db4cff PM	140	.owner = THIS_MODULE,
	141	.open = rcudata_open,
	142	.read = seq_read,
	143	.llseek = seq_lseek,
	144	.release = single_release,
	145	};
	146
	147	static void print_one_rcu_data_csv(struct seq_file m, struct rcu_data rdp)
	148	{
	149	if (!rdp->beenonline)
	150	return;
d7d6a11e	151	seq_printf(m, "%d,%s,%lu,%lu,%d,%d",
64db4cff	152	rdp->cpu,
5699ed8f	153	cpu_is_offline(rdp->cpu) ? "\"N\"" : "\"Y\"",
64db4cff	154	rdp->completed, rdp->gpnum,
d7d6a11e	155	rdp->passed_quiesce, rdp->qs_pending);
9b2e4f18	156	seq_printf(m, ",%d,%llx,%d,%lu",
23b5c8fa	157	atomic_read(&rdp->dynticks->dynticks),
64db4cff	158	rdp->dynticks->dynticks_nesting,
23b5c8fa	159	rdp->dynticks->dynticks_nmi_nesting,
64db4cff	160	rdp->dynticks_fqs);
2036d94a	161	seq_printf(m, ",%lu", rdp->offline_fqs);
486e2593	162	seq_printf(m, ",%ld,%ld,\"%c%c%c%c\"", rdp->qlen_lazy, rdp->qlen,
0ac3d136 PM	163	".N"[rdp->nxttail[RCU_NEXT_READY_TAIL] !=
	164	rdp->nxttail[RCU_NEXT_TAIL]],
	165	".R"[rdp->nxttail[RCU_WAIT_TAIL] !=
	166	rdp->nxttail[RCU_NEXT_READY_TAIL]],
	167	".W"[rdp->nxttail[RCU_DONE_TAIL] !=
	168	rdp->nxttail[RCU_WAIT_TAIL]],
a46e0899 PM	169	".D"[&rdp->nxtlist != rdp->nxttail[RCU_DONE_TAIL]]);
	170	#ifdef CONFIG_RCU_BOOST
	171	seq_printf(m, ",%d,\"%c\"",
d71df90e PM	172	per_cpu(rcu_cpu_has_work, rdp->cpu),
d71df90e PM	173	convert_kthread_status(per_cpu(rcu_cpu_kthread_status,
a46e0899 PM	174	rdp->cpu)));
	175	#endif /* #ifdef CONFIG_RCU_BOOST */
	176	seq_printf(m, ",%ld", rdp->blimit);
269dcc1c PM	177	seq_printf(m, ",%lu,%lu,%lu\n",
269dcc1c PM	178	rdp->n_cbs_invoked, rdp->n_cbs_orphaned, rdp->n_cbs_adopted);
64db4cff PM	179	}
	180
	181	static int show_rcudata_csv(struct seq_file m, void unused)
	182	{
c0cc962d PM	183	int cpu;
	184	struct rcu_state *rsp;
	185
d7d6a11e	186	seq_puts(m, "\"CPU\",\"Online?\",\"c\",\"g\",\"pq\",\"pq\",");
23b5c8fa	187	seq_puts(m, "\"dt\",\"dt nesting\",\"dt NMI nesting\",\"df\",");
2036d94a	188	seq_puts(m, "\"of\",\"qll\",\"ql\",\"qs\"");
a46e0899 PM	189	#ifdef CONFIG_RCU_BOOST
	190	seq_puts(m, "\"kt\",\"ktl\"");
	191	#endif /* #ifdef CONFIG_RCU_BOOST */
	192	seq_puts(m, ",\"b\",\"ci\",\"co\",\"ca\"\n");
c0cc962d PM	193	for_each_rcu_flavor(rsp) {
	194	seq_printf(m, "\"%s:\"\n", rsp->name);
	195	for_each_possible_cpu(cpu)
	196	print_one_rcu_data_csv(m, per_cpu_ptr(rsp->rda, cpu));
	197	}
64db4cff PM	198	return 0;
	199	}
	200
	201	static int rcudata_csv_open(struct inode inode, struct file file)
	202	{
	203	return single_open(file, show_rcudata_csv, NULL);
	204	}
	205
9b2619af	206	static const struct file_operations rcudata_csv_fops = {
64db4cff PM	207	.owner = THIS_MODULE,
	208	.open = rcudata_csv_open,
	209	.read = seq_read,
	210	.llseek = seq_lseek,
	211	.release = single_release,
	212	};
	213
0ea1f2eb PM	214	#ifdef CONFIG_RCU_BOOST
	215
	216	static void print_one_rcu_node_boost(struct seq_file m, struct rcu_node rnp)
	217	{
5cf05ad7	218	seq_printf(m, "%d:%d tasks=%c%c%c%c kt=%c ntb=%lu neb=%lu nnb=%lu ",
0ea1f2eb PM	219	rnp->grplo, rnp->grphi,
	220	"T."[list_empty(&rnp->blkd_tasks)],
	221	"N."[!rnp->gp_tasks],
	222	"E."[!rnp->exp_tasks],
	223	"B."[!rnp->boost_tasks],
d71df90e	224	convert_kthread_status(rnp->boost_kthread_status),
0ea1f2eb	225	rnp->n_tasks_boosted, rnp->n_exp_boosts,
5cf05ad7 PM	226	rnp->n_normal_boosts);
5cf05ad7 PM	227	seq_printf(m, "j=%04x bt=%04x\n",
0ea1f2eb PM	228	(int)(jiffies & 0xffff),
0ea1f2eb PM	229	(int)(rnp->boost_time & 0xffff));
5cf05ad7	230	seq_printf(m, " balk: nt=%lu egt=%lu bt=%lu nb=%lu ny=%lu nos=%lu\n",
0ea1f2eb PM	231	rnp->n_balk_blkd_tasks,
	232	rnp->n_balk_exp_gp_tasks,
	233	rnp->n_balk_boost_tasks,
	234	rnp->n_balk_notblocked,
	235	rnp->n_balk_notyet,
	236	rnp->n_balk_nos);
	237	}
	238
	239	static int show_rcu_node_boost(struct seq_file m, void unused)
	240	{
	241	struct rcu_node *rnp;
	242
	243	rcu_for_each_leaf_node(&rcu_preempt_state, rnp)
	244	print_one_rcu_node_boost(m, rnp);
	245	return 0;
	246	}
	247
	248	static int rcu_node_boost_open(struct inode inode, struct file file)
	249	{
	250	return single_open(file, show_rcu_node_boost, NULL);
	251	}
	252
	253	static const struct file_operations rcu_node_boost_fops = {
	254	.owner = THIS_MODULE,
	255	.open = rcu_node_boost_open,
	256	.read = seq_read,
	257	.llseek = seq_lseek,
	258	.release = single_release,
	259	};
	260
	261	/*
	262	* Create the rcuboost debugfs entry. Standard error return.
	263	*/
	264	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	265	{
	266	return !debugfs_create_file("rcuboost", 0444, rcudir, NULL,
	267	&rcu_node_boost_fops);
	268	}
	269
	270	#else /* #ifdef CONFIG_RCU_BOOST */
	271
	272	static int rcu_boost_trace_create_file(struct dentry *rcudir)
	273	{
	274	return 0; /* There cannot be an error if we didn't create it! */
	275	}
	276
	277	#endif /* #else #ifdef CONFIG_RCU_BOOST */
	278
64db4cff PM	279	static void print_one_rcu_state(struct seq_file m, struct rcu_state rsp)
64db4cff PM	280	{
20133cfc	281	unsigned long gpnum;
64db4cff PM	282	int level = 0;
	283	struct rcu_node *rnp;
	284
3397e040	285	gpnum = rsp->gpnum;
5cf05ad7	286	seq_printf(m, "%s: c=%lu g=%lu s=%d jfq=%ld j=%x ",
c0cc962d	287	rsp->name, rsp->completed, gpnum, rsp->fqs_state,
64db4cff	288	(long)(rsp->jiffies_force_qs - jiffies),
5cf05ad7 PM	289	(int)(jiffies & 0xffff));
5cf05ad7 PM	290	seq_printf(m, "nfqs=%lu/nfqsng=%lu(%lu) fqlh=%lu oqlen=%ld/%ld\n",
64db4cff PM	291	rsp->n_force_qs, rsp->n_force_qs_ngp,
64db4cff PM	292	rsp->n_force_qs - rsp->n_force_qs_ngp,
b1420f1c	293	rsp->n_force_qs_lh, rsp->qlen_lazy, rsp->qlen);
f885b7f2	294	for (rnp = &rsp->node[0]; rnp - &rsp->node[0] < rcu_num_nodes; rnp++) {
64db4cff PM	295	if (rnp->level != level) {
	296	seq_puts(m, "\n");
	297	level = rnp->level;
	298	}
12f5f524	299	seq_printf(m, "%lx/%lx %c%c>%c %d:%d ^%d ",
64db4cff	300	rnp->qsmask, rnp->qsmaskinit,
12f5f524 PM	301	".G"[rnp->gp_tasks != NULL],
	302	".E"[rnp->exp_tasks != NULL],
	303	".T"[!list_empty(&rnp->blkd_tasks)],
64db4cff PM	304	rnp->grplo, rnp->grphi, rnp->grpnum);
	305	}
	306	seq_puts(m, "\n");
	307	}
	308
	309	static int show_rcuhier(struct seq_file m, void unused)
	310	{
c0cc962d PM	311	struct rcu_state *rsp;
	312
	313	for_each_rcu_flavor(rsp)
	314	print_one_rcu_state(m, rsp);
64db4cff PM	315	return 0;
	316	}
	317
	318	static int rcuhier_open(struct inode inode, struct file file)
	319	{
	320	return single_open(file, show_rcuhier, NULL);
	321	}
	322
9b2619af	323	static const struct file_operations rcuhier_fops = {
64db4cff PM	324	.owner = THIS_MODULE,
	325	.open = rcuhier_open,
	326	.read = seq_read,
	327	.llseek = seq_lseek,
	328	.release = single_release,
	329	};
	330
15ba0ba8 PM	331	static void show_one_rcugp(struct seq_file m, struct rcu_state rsp)
	332	{
	333	unsigned long flags;
	334	unsigned long completed;
	335	unsigned long gpnum;
	336	unsigned long gpage;
	337	unsigned long gpmax;
	338	struct rcu_node *rnp = &rsp->node[0];
	339
	340	raw_spin_lock_irqsave(&rnp->lock, flags);
	341	completed = rsp->completed;
	342	gpnum = rsp->gpnum;
	343	if (rsp->completed == rsp->gpnum)
	344	gpage = 0;
	345	else
	346	gpage = jiffies - rsp->gp_start;
	347	gpmax = rsp->gp_max;
	348	raw_spin_unlock_irqrestore(&rnp->lock, flags);
	349	seq_printf(m, "%s: completed=%ld gpnum=%lu age=%ld max=%ld\n",
	350	rsp->name, completed, gpnum, gpage, gpmax);
	351	}
	352
64db4cff PM	353	static int show_rcugp(struct seq_file m, void unused)
64db4cff PM	354	{
c0cc962d PM	355	struct rcu_state *rsp;
	356
	357	for_each_rcu_flavor(rsp)
	358	show_one_rcugp(m, rsp);
64db4cff PM	359	return 0;
	360	}
	361
	362	static int rcugp_open(struct inode inode, struct file file)
	363	{
	364	return single_open(file, show_rcugp, NULL);
	365	}
	366
9b2619af	367	static const struct file_operations rcugp_fops = {
64db4cff PM	368	.owner = THIS_MODULE,
	369	.open = rcugp_open,
	370	.read = seq_read,
	371	.llseek = seq_lseek,
	372	.release = single_release,
	373	};
	374
7ba5c840 PM	375	static void print_one_rcu_pending(struct seq_file m, struct rcu_data rdp)
7ba5c840 PM	376	{
5cf05ad7	377	seq_printf(m, "%3d%cnp=%ld ",
7ba5c840 PM	378	rdp->cpu,
7ba5c840 PM	379	cpu_is_offline(rdp->cpu) ? '!' : ' ',
5cf05ad7 PM	380	rdp->n_rcu_pending);
5cf05ad7 PM	381	seq_printf(m, "qsp=%ld rpq=%ld cbr=%ld cng=%ld ",
7ba5c840	382	rdp->n_rp_qs_pending,
d21670ac	383	rdp->n_rp_report_qs,
7ba5c840	384	rdp->n_rp_cb_ready,
5cf05ad7	385	rdp->n_rp_cpu_needs_gp);
4605c014	386	seq_printf(m, "gpc=%ld gps=%ld nn=%ld\n",
7ba5c840 PM	387	rdp->n_rp_gp_completed,
7ba5c840 PM	388	rdp->n_rp_gp_started,
7ba5c840 PM	389	rdp->n_rp_need_nothing);
	390	}
	391
c0cc962d	392	static int show_rcu_pending(struct seq_file m, void unused)
7ba5c840 PM	393	{
	394	int cpu;
	395	struct rcu_data *rdp;
c0cc962d PM	396	struct rcu_state *rsp;
	397
	398	for_each_rcu_flavor(rsp) {
	399	seq_printf(m, "%s:\n", rsp->name);
	400	for_each_possible_cpu(cpu) {
	401	rdp = per_cpu_ptr(rsp->rda, cpu);
	402	if (rdp->beenonline)
	403	print_one_rcu_pending(m, rdp);
	404	}
7ba5c840	405	}
7ba5c840 PM	406	return 0;
	407	}
	408
	409	static int rcu_pending_open(struct inode inode, struct file file)
	410	{
	411	return single_open(file, show_rcu_pending, NULL);
	412	}
	413
9b2619af	414	static const struct file_operations rcu_pending_fops = {
7ba5c840 PM	415	.owner = THIS_MODULE,
	416	.open = rcu_pending_open,
	417	.read = seq_read,
	418	.llseek = seq_lseek,
	419	.release = single_release,
	420	};
	421
4a298656 PM	422	static int show_rcutorture(struct seq_file m, void unused)
	423	{
	424	seq_printf(m, "rcutorture test sequence: %lu %s\n",
	425	rcutorture_testseq >> 1,
	426	(rcutorture_testseq & 0x1) ? "(test in progress)" : "");
	427	seq_printf(m, "rcutorture update version number: %lu\n",
	428	rcutorture_vernum);
	429	return 0;
	430	}
	431
	432	static int rcutorture_open(struct inode inode, struct file file)
	433	{
	434	return single_open(file, show_rcutorture, NULL);
	435	}
	436
	437	static const struct file_operations rcutorture_fops = {
	438	.owner = THIS_MODULE,
	439	.open = rcutorture_open,
	440	.read = seq_read,
	441	.llseek = seq_lseek,
	442	.release = single_release,
	443	};
	444
7ba5c840	445	static struct dentry *rcudir;
7ba5c840	446
deb7a418	447	static int __init rcutree_trace_init(void)
64db4cff	448	{
22f00b69 PM	449	struct dentry *retval;
22f00b69 PM	450
64db4cff PM	451	rcudir = debugfs_create_dir("rcu", NULL);
64db4cff PM	452	if (!rcudir)
22f00b69	453	goto free_out;
64db4cff	454
d7e187c8 PM	455	retval = debugfs_create_file("rcubarrier", 0444, rcudir,
	456	NULL, &rcubarrier_fops);
	457	if (!retval)
	458	goto free_out;
	459
22f00b69	460	retval = debugfs_create_file("rcudata", 0444, rcudir,
64db4cff	461	NULL, &rcudata_fops);
22f00b69	462	if (!retval)
64db4cff PM	463	goto free_out;
64db4cff PM	464
22f00b69	465	retval = debugfs_create_file("rcudata.csv", 0444, rcudir,
64db4cff	466	NULL, &rcudata_csv_fops);
22f00b69	467	if (!retval)
64db4cff PM	468	goto free_out;
64db4cff PM	469
0ea1f2eb PM	470	if (rcu_boost_trace_create_file(rcudir))
	471	goto free_out;
	472
22f00b69 PM	473	retval = debugfs_create_file("rcugp", 0444, rcudir, NULL, &rcugp_fops);
22f00b69 PM	474	if (!retval)
64db4cff PM	475	goto free_out;
64db4cff PM	476
22f00b69	477	retval = debugfs_create_file("rcuhier", 0444, rcudir,
64db4cff	478	NULL, &rcuhier_fops);
22f00b69	479	if (!retval)
64db4cff	480	goto free_out;
7ba5c840	481
22f00b69	482	retval = debugfs_create_file("rcu_pending", 0444, rcudir,
7ba5c840	483	NULL, &rcu_pending_fops);
22f00b69	484	if (!retval)
7ba5c840	485	goto free_out;
4a298656 PM	486
	487	retval = debugfs_create_file("rcutorture", 0444, rcudir,
	488	NULL, &rcutorture_fops);
	489	if (!retval)
	490	goto free_out;
64db4cff PM	491	return 0;
64db4cff PM	492	free_out:
22f00b69	493	debugfs_remove_recursive(rcudir);
64db4cff PM	494	return 1;
	495	}
	496
deb7a418	497	static void __exit rcutree_trace_cleanup(void)
64db4cff	498	{
22f00b69	499	debugfs_remove_recursive(rcudir);
64db4cff PM	500	}
	501
	502
deb7a418 PM	503	module_init(rcutree_trace_init);
deb7a418 PM	504	module_exit(rcutree_trace_cleanup);
64db4cff PM	505
	506	MODULE_AUTHOR("Paul E. McKenney");
	507	MODULE_DESCRIPTION("Read-Copy Update tracing for hierarchical implementation");
	508	MODULE_LICENSE("GPL");