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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
/****************************************************************************
*
* log category entries
*
***************************************************************************/
#define DEBUGFS_WRITE_BUF_SIZE 256
#define VCHIQ_LOG_ERROR_STR "error"
#define VCHIQ_LOG_WARNING_STR "warning"
#define VCHIQ_LOG_INFO_STR "info"
#define VCHIQ_LOG_TRACE_STR "trace"
/* Global 'vchiq' debugfs and clients entry used by all instances */
static struct dentry *vchiq_dbg_dir;
static struct dentry *vchiq_dbg_clients;
/* Log category debugfs entries */
struct vchiq_debugfs_log_entry {
const char *name;
void *plevel;
};
static struct vchiq_debugfs_log_entry vchiq_debugfs_log_entries[] = {
{ "core", &vchiq_core_log_level },
{ "msg", &vchiq_core_msg_log_level },
{ "sync", &vchiq_sync_log_level },
{ "susp", &vchiq_susp_log_level },
{ "arm", &vchiq_arm_log_level },
};
static int n_log_entries = ARRAY_SIZE(vchiq_debugfs_log_entries);
static int debugfs_log_show(struct seq_file *f, void *offset)
{
int *levp = f->private;
char *log_value = NULL;
switch (*levp) {
case VCHIQ_LOG_ERROR:
log_value = VCHIQ_LOG_ERROR_STR;
break;
case VCHIQ_LOG_WARNING:
log_value = VCHIQ_LOG_WARNING_STR;
break;
case VCHIQ_LOG_INFO:
log_value = VCHIQ_LOG_INFO_STR;
break;
case VCHIQ_LOG_TRACE:
log_value = VCHIQ_LOG_TRACE_STR;
break;
default:
break;
}
seq_printf(f, "%s\n", log_value ? log_value : "(null)");
return 0;
}
static int debugfs_log_open(struct inode *inode, struct file *file)
{
return single_open(file, debugfs_log_show, inode->i_private);
}
static ssize_t debugfs_log_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *ppos)
{
struct seq_file *f = (struct seq_file *)file->private_data;
int *levp = f->private;
char kbuf[DEBUGFS_WRITE_BUF_SIZE + 1];
memset(kbuf, 0, DEBUGFS_WRITE_BUF_SIZE + 1);
if (count >= DEBUGFS_WRITE_BUF_SIZE)
count = DEBUGFS_WRITE_BUF_SIZE;
if (copy_from_user(kbuf, buffer, count))
return -EFAULT;
kbuf[count - 1] = 0;
if (strncmp("error", kbuf, strlen("error")) == 0)
*levp = VCHIQ_LOG_ERROR;
else if (strncmp("warning", kbuf, strlen("warning")) == 0)
*levp = VCHIQ_LOG_WARNING;
else if (strncmp("info", kbuf, strlen("info")) == 0)
*levp = VCHIQ_LOG_INFO;
else if (strncmp("trace", kbuf, strlen("trace")) == 0)
*levp = VCHIQ_LOG_TRACE;
else
*levp = VCHIQ_LOG_DEFAULT;
*ppos += count;
return count;
}
static const struct file_operations debugfs_log_fops = {
.owner = THIS_MODULE,
.open = debugfs_log_open,
.write = debugfs_log_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int debugfs_usecount_show(struct seq_file *f, void *offset)
{
VCHIQ_INSTANCE_T 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)
{
VCHIQ_INSTANCE_T instance = f->private;
int trace;
trace = vchiq_instance_get_trace(instance);
seq_printf(f, "%s\n", trace ? "Y" : "N");
return 0;
}
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;
VCHIQ_INSTANCE_T 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(VCHIQ_INSTANCE_T 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(VCHIQ_INSTANCE_T instance)
{
struct vchiq_debugfs_node *node =
vchiq_instance_get_debugfs_node(instance);
debugfs_remove_recursive(node->dentry);
}
void vchiq_debugfs_init(void)
{
struct dentry *dir;
int i;
vchiq_dbg_dir = debugfs_create_dir("vchiq", NULL);
vchiq_dbg_clients = debugfs_create_dir("clients", vchiq_dbg_dir);
/* create an entry under <debugfs>/vchiq/log for each log category */
dir = debugfs_create_dir("log", vchiq_dbg_dir);
for (i = 0; i < n_log_entries; i++)
debugfs_create_file(vchiq_debugfs_log_entries[i].name, 0644,
dir, vchiq_debugfs_log_entries[i].plevel,
&debugfs_log_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(VCHIQ_INSTANCE_T instance)
{
}
void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
{
}
#endif /* CONFIG_DEBUG_FS */
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