// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (c) 2014 Raspberry Pi (Trading) Ltd. All rights reserved.
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* Copyright (c) 2010-2012 Broadcom. All rights reserved.
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*/
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#include <linux/debugfs.h>
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#include "vchiq_core.h"
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#include "vchiq_arm.h"
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#include "vchiq_debugfs.h"
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#ifdef CONFIG_DEBUG_FS
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/****************************************************************************
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*
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* log category entries
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*
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***************************************************************************/
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#define DEBUGFS_WRITE_BUF_SIZE 256
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#define VCHIQ_LOG_ERROR_STR "error"
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#define VCHIQ_LOG_WARNING_STR "warning"
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#define VCHIQ_LOG_INFO_STR "info"
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#define VCHIQ_LOG_TRACE_STR "trace"
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/* Global 'vchiq' debugfs and clients entry used by all instances */
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static struct dentry *vchiq_dbg_dir;
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static struct dentry *vchiq_dbg_clients;
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/* Log category debugfs entries */
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struct vchiq_debugfs_log_entry {
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const char *name;
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void *plevel;
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};
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static struct vchiq_debugfs_log_entry vchiq_debugfs_log_entries[] = {
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{ "core", &vchiq_core_log_level },
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{ "msg", &vchiq_core_msg_log_level },
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{ "sync", &vchiq_sync_log_level },
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{ "susp", &vchiq_susp_log_level },
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{ "arm", &vchiq_arm_log_level },
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};
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static int n_log_entries = ARRAY_SIZE(vchiq_debugfs_log_entries);
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static int debugfs_log_show(struct seq_file *f, void *offset)
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{
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int *levp = f->private;
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char *log_value = NULL;
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switch (*levp) {
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case VCHIQ_LOG_ERROR:
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log_value = VCHIQ_LOG_ERROR_STR;
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break;
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case VCHIQ_LOG_WARNING:
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log_value = VCHIQ_LOG_WARNING_STR;
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break;
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case VCHIQ_LOG_INFO:
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log_value = VCHIQ_LOG_INFO_STR;
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break;
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case VCHIQ_LOG_TRACE:
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log_value = VCHIQ_LOG_TRACE_STR;
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break;
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default:
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break;
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}
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seq_printf(f, "%s\n", log_value ? log_value : "(null)");
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return 0;
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}
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static int debugfs_log_open(struct inode *inode, struct file *file)
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{
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return single_open(file, debugfs_log_show, inode->i_private);
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}
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static ssize_t debugfs_log_write(struct file *file,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct seq_file *f = (struct seq_file *)file->private_data;
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int *levp = f->private;
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char kbuf[DEBUGFS_WRITE_BUF_SIZE + 1];
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memset(kbuf, 0, DEBUGFS_WRITE_BUF_SIZE + 1);
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if (count >= DEBUGFS_WRITE_BUF_SIZE)
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count = DEBUGFS_WRITE_BUF_SIZE;
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if (copy_from_user(kbuf, buffer, count))
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return -EFAULT;
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kbuf[count - 1] = 0;
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if (strncmp("error", kbuf, strlen("error")) == 0)
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*levp = VCHIQ_LOG_ERROR;
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else if (strncmp("warning", kbuf, strlen("warning")) == 0)
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*levp = VCHIQ_LOG_WARNING;
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else if (strncmp("info", kbuf, strlen("info")) == 0)
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*levp = VCHIQ_LOG_INFO;
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else if (strncmp("trace", kbuf, strlen("trace")) == 0)
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*levp = VCHIQ_LOG_TRACE;
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else
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*levp = VCHIQ_LOG_DEFAULT;
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*ppos += count;
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return count;
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}
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static const struct file_operations debugfs_log_fops = {
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.owner = THIS_MODULE,
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.open = debugfs_log_open,
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.write = debugfs_log_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int debugfs_usecount_show(struct seq_file *f, void *offset)
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{
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struct vchiq_instance *instance = f->private;
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int use_count;
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use_count = vchiq_instance_get_use_count(instance);
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seq_printf(f, "%d\n", use_count);
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return 0;
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}
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DEFINE_SHOW_ATTRIBUTE(debugfs_usecount);
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static int debugfs_trace_show(struct seq_file *f, void *offset)
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{
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struct vchiq_instance *instance = f->private;
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int trace;
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trace = vchiq_instance_get_trace(instance);
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seq_printf(f, "%s\n", trace ? "Y" : "N");
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return 0;
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}
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static int debugfs_trace_open(struct inode *inode, struct file *file)
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{
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return single_open(file, debugfs_trace_show, inode->i_private);
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}
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static ssize_t debugfs_trace_write(struct file *file,
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const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct seq_file *f = (struct seq_file *)file->private_data;
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struct vchiq_instance *instance = f->private;
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char firstchar;
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if (copy_from_user(&firstchar, buffer, 1))
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return -EFAULT;
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switch (firstchar) {
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case 'Y':
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case 'y':
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case '1':
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vchiq_instance_set_trace(instance, 1);
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break;
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case 'N':
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case 'n':
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case '0':
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vchiq_instance_set_trace(instance, 0);
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break;
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default:
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break;
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}
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*ppos += count;
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return count;
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}
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static const struct file_operations debugfs_trace_fops = {
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.owner = THIS_MODULE,
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.open = debugfs_trace_open,
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.write = debugfs_trace_write,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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/* add an instance (process) to the debugfs entries */
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void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
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{
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char pidstr[16];
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struct dentry *top;
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snprintf(pidstr, sizeof(pidstr), "%d",
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vchiq_instance_get_pid(instance));
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top = debugfs_create_dir(pidstr, vchiq_dbg_clients);
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debugfs_create_file("use_count", 0444, top, instance,
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&debugfs_usecount_fops);
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debugfs_create_file("trace", 0644, top, instance, &debugfs_trace_fops);
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vchiq_instance_get_debugfs_node(instance)->dentry = top;
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}
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void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
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{
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struct vchiq_debugfs_node *node =
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vchiq_instance_get_debugfs_node(instance);
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debugfs_remove_recursive(node->dentry);
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}
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void vchiq_debugfs_init(void)
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{
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struct dentry *dir;
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int i;
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vchiq_dbg_dir = debugfs_create_dir("vchiq", NULL);
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vchiq_dbg_clients = debugfs_create_dir("clients", vchiq_dbg_dir);
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/* create an entry under <debugfs>/vchiq/log for each log category */
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dir = debugfs_create_dir("log", vchiq_dbg_dir);
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for (i = 0; i < n_log_entries; i++)
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debugfs_create_file(vchiq_debugfs_log_entries[i].name, 0644,
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dir, vchiq_debugfs_log_entries[i].plevel,
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&debugfs_log_fops);
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}
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/* remove all the debugfs entries */
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void vchiq_debugfs_deinit(void)
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{
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debugfs_remove_recursive(vchiq_dbg_dir);
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}
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#else /* CONFIG_DEBUG_FS */
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void vchiq_debugfs_init(void)
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{
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}
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void vchiq_debugfs_deinit(void)
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{
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}
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void vchiq_debugfs_add_instance(struct vchiq_instance *instance)
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{
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}
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void vchiq_debugfs_remove_instance(struct vchiq_instance *instance)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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