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![Oleksandr Tymoshenko](/assets/img/avatar_default.png)
- Add LIB_VERSION ioctl - Add CLOSE_DELIVERED ioctl - Bump code version Upstream version: 3782f2ad42c08f4d32f64138f8be7341afc380f5
384 lines
9.2 KiB
C
384 lines
9.2 KiB
C
/**
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the above-listed copyright holders may not be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2, as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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/* Top-level debug info */
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struct vchiq_debugfs_info {
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/* Global 'vchiq' debugfs entry used by all instances */
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struct dentry *vchiq_cfg_dir;
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/* one entry per client process */
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struct dentry *clients;
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/* log categories */
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struct dentry *log_categories;
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};
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static struct vchiq_debugfs_info debugfs_info;
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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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int *plevel;
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struct dentry *dir;
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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 =
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sizeof(vchiq_debugfs_log_entries)/sizeof(vchiq_debugfs_log_entries[0]);
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static struct dentry *vchiq_clients_top(void);
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static struct dentry *vchiq_debugfs_top(void);
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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 int 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) != 0)
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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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/* create an entry under <debugfs>/vchiq/log for each log category */
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static int vchiq_debugfs_create_log_entries(struct dentry *top)
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{
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struct dentry *dir;
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size_t i;
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int ret = 0;
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dir = debugfs_create_dir("log", vchiq_debugfs_top());
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if (!dir)
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return -ENOMEM;
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debugfs_info.log_categories = dir;
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for (i = 0; i < n_log_entries; i++) {
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void *levp = (void *)vchiq_debugfs_log_entries[i].plevel;
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dir = debugfs_create_file(vchiq_debugfs_log_entries[i].name,
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0644,
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debugfs_info.log_categories,
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levp,
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&debugfs_log_fops);
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if (!dir) {
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ret = -ENOMEM;
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break;
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}
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vchiq_debugfs_log_entries[i].dir = dir;
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}
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return ret;
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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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VCHIQ_INSTANCE_T 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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static int debugfs_usecount_open(struct inode *inode, struct file *file)
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{
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return single_open(file, debugfs_usecount_show, inode->i_private);
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}
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static const struct file_operations debugfs_usecount_fops = {
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.owner = THIS_MODULE,
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.open = debugfs_usecount_open,
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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_trace_show(struct seq_file *f, void *offset)
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{
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VCHIQ_INSTANCE_T 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 int 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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VCHIQ_INSTANCE_T instance = f->private;
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char firstchar;
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if (copy_from_user(&firstchar, buffer, 1) != 0)
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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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int vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
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{
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char pidstr[16];
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struct dentry *top, *use_count, *trace;
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struct dentry *clients = vchiq_clients_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, clients);
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if (!top)
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goto fail_top;
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use_count = debugfs_create_file("use_count",
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0444, top,
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instance,
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&debugfs_usecount_fops);
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if (!use_count)
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goto fail_use_count;
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trace = debugfs_create_file("trace",
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0644, top,
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instance,
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&debugfs_trace_fops);
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if (!trace)
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goto fail_trace;
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vchiq_instance_get_debugfs_node(instance)->dentry = top;
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return 0;
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fail_trace:
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debugfs_remove(use_count);
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fail_use_count:
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debugfs_remove(top);
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fail_top:
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return -ENOMEM;
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}
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void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
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{
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VCHIQ_DEBUGFS_NODE_T *node = vchiq_instance_get_debugfs_node(instance);
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debugfs_remove_recursive(node->dentry);
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}
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int vchiq_debugfs_init(void)
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{
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BUG_ON(debugfs_info.vchiq_cfg_dir != NULL);
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debugfs_info.vchiq_cfg_dir = debugfs_create_dir("vchiq", NULL);
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if (debugfs_info.vchiq_cfg_dir == NULL)
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goto fail;
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debugfs_info.clients = debugfs_create_dir("clients",
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vchiq_debugfs_top());
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if (!debugfs_info.clients)
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goto fail;
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if (vchiq_debugfs_create_log_entries(vchiq_debugfs_top()) != 0)
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goto fail;
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return 0;
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fail:
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vchiq_debugfs_deinit();
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vchiq_log_error(vchiq_arm_log_level,
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"%s: failed to create debugfs directory",
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__func__);
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return -ENOMEM;
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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_debugfs_top());
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}
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static struct dentry *vchiq_clients_top(void)
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{
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return debugfs_info.clients;
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}
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static struct dentry *vchiq_debugfs_top(void)
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{
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BUG_ON(debugfs_info.vchiq_cfg_dir == NULL);
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return debugfs_info.vchiq_cfg_dir;
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}
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#else /* CONFIG_DEBUG_FS */
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int vchiq_debugfs_init(void)
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{
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return 0;
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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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int vchiq_debugfs_add_instance(VCHIQ_INSTANCE_T instance)
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{
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return 0;
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}
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void vchiq_debugfs_remove_instance(VCHIQ_INSTANCE_T instance)
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{
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}
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#endif /* CONFIG_DEBUG_FS */
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