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// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright (c) 2014 Raspberry Pi (Trading) Ltd. All rights reserved.
* Copyright (c) 2010-2012 Broadcom. All rights reserved.
*/
#include <linux/debugfs.h>
#include "vchiq_core.h"
#include "vchiq_arm.h"
#include "vchiq_debugfs.h"
#ifdef CONFIG_DEBUG_FS
#define DEBUGFS_WRITE_BUF_SIZE 256
/* Global 'vchiq' debugfs and clients entry used by all instances */
static struct dentry *vchiq_dbg_dir;
static struct dentry *vchiq_dbg_clients;
static int debugfs_usecount_show(struct seq_file *f, void *offset)
{
struct vchiq_instance *instance = f->private;
int use_count;
use_count = vchiq_instance_get_use_count(instance);
seq_printf(f, "%d\n", use_count);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(debugfs_usecount);
static int debugfs_trace_show(struct seq_file *f, void *offset)
{
struct vchiq_instance *instance = f->private;
int trace;
trace = vchiq_instance_get_trace(instance);
seq_printf(f, "%s\n", trace ? "Y" : "N");
return 0;
}
static int vchiq_dump_show(struct seq_file *f, void *offset)
{
vchiq_dump_state(f, &g_state);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(vchiq_dump);
static int debugfs_trace_open(struct inode *inode, struct file *file)
{
return single_open(file, debugfs_trace_show, inode->i_private);
}
static ssize_t debugfs_trace_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *ppos)
{
struct seq_file *f = (struct seq_file *)file->private_data;
struct vchiq_instance *instance = f->private;
char firstchar;
if (copy_from_user(&firstchar, buffer, 1))
return -EFAULT;
switch (firstchar) {
case 'Y':
case 'y':
case '1':
vchiq_instance_set_trace(instance, 1);
break;
case 'N':
case 'n':
case '0':
vchiq_instance_set_trace(instance, 0);
break;
default:
break;
}
*ppos += count;
return count;
}
static const struct file_operations debugfs_trace_fops = {
.owner = THIS_MODULE,
.open = debugfs_trace_open,
.write = debugfs_trace_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* add an instance (process) to the debugfs entries */
void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
{
char pidstr[16];
struct dentry *top;
snprintf(pidstr, sizeof(pidstr), "%d",
vchiq_instance_get_pid(instance));
top = debugfs_create_dir(pidstr, vchiq_dbg_clients);
debugfs_create_file("use_count", 0444, top, instance,
&debugfs_usecount_fops);
debugfs_create_file("trace", 0644, top, instance, &debugfs_trace_fops);
vchiq_instance_get_debugfs_node(instance)->dentry = top;
}
void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
{
struct vchiq_debugfs_node *node =
vchiq_instance_get_debugfs_node(instance);
debugfs_remove_recursive(node->dentry);
}
void vchiq_debugfs_init(void)
{
vchiq_dbg_dir = debugfs_create_dir("vchiq", NULL);
vchiq_dbg_clients = debugfs_create_dir("clients", vchiq_dbg_dir);
debugfs_create_file("state", S_IFREG | 0444, vchiq_dbg_dir, NULL,
&vchiq_dump_fops);
}
/* remove all the debugfs entries */
void vchiq_debugfs_deinit(void)
{
debugfs_remove_recursive(vchiq_dbg_dir);
}
#else /* CONFIG_DEBUG_FS */
void vchiq_debugfs_init(void)
{
}
void vchiq_debugfs_deinit(void)
{
}
void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
{
}
void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
{
}
#endif /* CONFIG_DEBUG_FS */
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