drivers/misc/mic/scif/scif_debugfs.c

/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * Copyright(c) 2014 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * 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.
 *
 * Intel SCIF driver.
 *
 */
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include "../common/mic_dev.h"
#include "scif_main.h"

/* Debugfs parent dir */
static struct dentry *scif_dbg;

static int scif_dev_test(struct seq_file *s, void *unused)
{
	int node;

	seq_printf(s, "Total Nodes %d Self Node Id %d Maxid %d\n",
		   scif_info.total, scif_info.nodeid,
		   scif_info.maxid);

	if (!scif_dev)
		return 0;

	seq_printf(s, "%-16s\t%-16s\n", "node_id", "state");

	for (node = 0; node <= scif_info.maxid; node++)
		seq_printf(s, "%-16d\t%-16s\n", scif_dev[node].node,
			   _scifdev_alive(&scif_dev[node]) ?
			   "Running" : "Offline");
	return 0;
}

static int scif_dev_test_open(struct inode *inode, struct file *file)
{
	return single_open(file, scif_dev_test, inode->i_private);
}

static int scif_dev_test_release(struct inode *inode, struct file *file)
{
	return single_release(inode, file);
}

static const struct file_operations scif_dev_ops = {
	.owner   = THIS_MODULE,
	.open    = scif_dev_test_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = scif_dev_test_release
};

void __init scif_init_debugfs(void)
{
	struct dentry *d;

	scif_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (!scif_dbg) {
		dev_err(scif_info.mdev.this_device,
			"can't create debugfs dir scif\n");
		return;
	}

	d = debugfs_create_file("scif_dev", 0444, scif_dbg,
				NULL, &scif_dev_ops);
	debugfs_create_u8("en_msg_log", 0666, scif_dbg, &scif_info.en_msg_log);
	debugfs_create_u8("p2p_enable", 0666, scif_dbg, &scif_info.p2p_enable);
}

void scif_exit_debugfs(void)
{
	debugfs_remove_recursive(scif_dbg);
}