release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/staging/batman-adv/bat_debugfs.c

   1 /*
   2  * Copyright (C) 2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23
  24 #include <linux/debugfs.h>
  25
  26 #include "bat_debugfs.h"
  27 #include "translation-table.h"
  28 #include "originator.h"
  29 #include "hard-interface.h"
  30 #include "vis.h"
  31 #include "icmp_socket.h"
  32
  33 static struct dentry *bat_debugfs;
  34
  35 #ifdef CONFIG_BATMAN_ADV_DEBUG
  36 #define LOG_BUFF_MASK (log_buff_len-1)
  37 #define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK])
  38
  39 static int log_buff_len = LOG_BUF_LEN;
  40
  41 static void emit_log_char(struct debug_log *debug_log, char c)
  42 {
  43         LOG_BUFF(debug_log->log_end) = c;
  44         debug_log->log_end++;
  45
  46         if (debug_log->log_end - debug_log->log_start > log_buff_len)
  47                 debug_log->log_start = debug_log->log_end - log_buff_len;
  48 }
  49
  50 static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
  51 {
  52         int printed_len;
  53         va_list args;
  54         static char debug_log_buf[256];
  55         char *p;
  56         unsigned long flags;
  57
  58         if (!debug_log)
  59                 return 0;
  60
  61         spin_lock_irqsave(&debug_log->lock, flags);
  62         va_start(args, fmt);
  63         printed_len = vscnprintf(debug_log_buf, sizeof(debug_log_buf),
  64                                  fmt, args);
  65         va_end(args);
  66
  67         for (p = debug_log_buf; *p != 0; p++)
  68                 emit_log_char(debug_log, *p);
  69
  70         spin_unlock_irqrestore(&debug_log->lock, flags);
  71
  72         wake_up(&debug_log->queue_wait);
  73
  74         return 0;
  75 }
  76
  77 int debug_log(struct bat_priv *bat_priv, char *fmt, ...)
  78 {
  79         va_list args;
  80         char tmp_log_buf[256];
  81
  82         va_start(args, fmt);
  83         vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
  84         fdebug_log(bat_priv->debug_log, "[%10u] %s",
  85                    (jiffies / HZ), tmp_log_buf);
  86         va_end(args);
  87
  88         return 0;
  89 }
  90
  91 static int log_open(struct inode *inode, struct file *file)
  92 {
  93         file->private_data = inode->i_private;
  94         inc_module_count();
  95         return 0;
  96 }
  97
  98 static int log_release(struct inode *inode, struct file *file)
  99 {
 100         dec_module_count();
 101         return 0;
 102 }
 103
 104 static ssize_t log_read(struct file *file, char __user *buf,
 105                         size_t count, loff_t *ppos)
 106 {
 107         struct bat_priv *bat_priv = file->private_data;
 108         struct debug_log *debug_log = bat_priv->debug_log;
 109         int error, i = 0;
 110         char c;
 111         unsigned long flags;
 112
 113         if ((file->f_flags & O_NONBLOCK) &&
 114             !(debug_log->log_end - debug_log->log_start))
 115                 return -EAGAIN;
 116
 117         if ((!buf) || (count < 0))
 118                 return -EINVAL;
 119
 120         if (count == 0)
 121                 return 0;
 122
 123         if (!access_ok(VERIFY_WRITE, buf, count))
 124                 return -EFAULT;
 125
 126         error = wait_event_interruptible(debug_log->queue_wait,
 127                                 (debug_log->log_start - debug_log->log_end));
 128
 129         if (error)
 130                 return error;
 131
 132         spin_lock_irqsave(&debug_log->lock, flags);
 133
 134         while ((!error) && (i < count) &&
 135                (debug_log->log_start != debug_log->log_end)) {
 136                 c = LOG_BUFF(debug_log->log_start);
 137
 138                 debug_log->log_start++;
 139
 140                 spin_unlock_irqrestore(&debug_log->lock, flags);
 141
 142                 error = __put_user(c, buf);
 143
 144                 spin_lock_irqsave(&debug_log->lock, flags);
 145
 146                 buf++;
 147                 i++;
 148
 149         }
 150
 151         spin_unlock_irqrestore(&debug_log->lock, flags);
 152
 153         if (!error)
 154                 return i;
 155
 156         return error;
 157 }
 158
 159 static unsigned int log_poll(struct file *file, poll_table *wait)
 160 {
 161         struct bat_priv *bat_priv = file->private_data;
 162         struct debug_log *debug_log = bat_priv->debug_log;
 163
 164         poll_wait(file, &debug_log->queue_wait, wait);
 165
 166         if (debug_log->log_end - debug_log->log_start)
 167                 return POLLIN | POLLRDNORM;
 168
 169         return 0;
 170 }
 171
 172 static const struct file_operations log_fops = {
 173         .open           = log_open,
 174         .release        = log_release,
 175         .read           = log_read,
 176         .poll           = log_poll,
 177 };
 178
 179 static int debug_log_setup(struct bat_priv *bat_priv)
 180 {
 181         struct dentry *d;
 182
 183         if (!bat_priv->debug_dir)
 184                 goto err;
 185
 186         bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
 187         if (!bat_priv->debug_log)
 188                 goto err;
 189
 190         spin_lock_init(&bat_priv->debug_log->lock);
 191         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 192
 193         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 194                                 bat_priv->debug_dir, bat_priv, &log_fops);
 195         if (d)
 196                 goto err;
 197
 198         return 0;
 199
 200 err:
 201         return 1;
 202 }
 203
 204 static void debug_log_cleanup(struct bat_priv *bat_priv)
 205 {
 206         kfree(bat_priv->debug_log);
 207         bat_priv->debug_log = NULL;
 208 }
 209 #else /* CONFIG_BATMAN_ADV_DEBUG */
 210 static int debug_log_setup(struct bat_priv *bat_priv)
 211 {
 212         bat_priv->debug_log = NULL;
 213         return 0;
 214 }
 215
 216 static void debug_log_cleanup(struct bat_priv *bat_priv)
 217 {
 218         return;
 219 }
 220 #endif
 221
 222 static int originators_open(struct inode *inode, struct file *file)
 223 {
 224         struct net_device *net_dev = (struct net_device *)inode->i_private;
 225         return single_open(file, orig_seq_print_text, net_dev);
 226 }
 227
 228 static int transtable_global_open(struct inode *inode, struct file *file)
 229 {
 230         struct net_device *net_dev = (struct net_device *)inode->i_private;
 231         return single_open(file, hna_global_seq_print_text, net_dev);
 232 }
 233
 234 static int transtable_local_open(struct inode *inode, struct file *file)
 235 {
 236         struct net_device *net_dev = (struct net_device *)inode->i_private;
 237         return single_open(file, hna_local_seq_print_text, net_dev);
 238 }
 239
 240 static int vis_data_open(struct inode *inode, struct file *file)
 241 {
 242         struct net_device *net_dev = (struct net_device *)inode->i_private;
 243         return single_open(file, vis_seq_print_text, net_dev);
 244 }
 245
 246 struct bat_debuginfo {
 247         struct attribute attr;
 248         const struct file_operations fops;
 249 };
 250
 251 #define BAT_DEBUGINFO(_name, _mode, _open)      \
 252 struct bat_debuginfo bat_debuginfo_##_name = {  \
 253         .attr = { .name = __stringify(_name),   \
 254                   .mode = _mode, },             \
 255         .fops = { .owner = THIS_MODULE,         \
 256                   .open = _open,                \
 257                   .read = seq_read,             \
 258                   .llseek = seq_lseek,          \
 259                   .release = single_release,    \
 260                 }                               \
 261 };
 262
 263 static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
 264 static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
 265 static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
 266 static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
 267
 268 static struct bat_debuginfo *mesh_debuginfos[] = {
 269         &bat_debuginfo_originators,
 270         &bat_debuginfo_transtable_global,
 271         &bat_debuginfo_transtable_local,
 272         &bat_debuginfo_vis_data,
 273         NULL,
 274 };
 275
 276 void debugfs_init(void)
 277 {
 278         bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
 279         if (bat_debugfs == ERR_PTR(-ENODEV))
 280                 bat_debugfs = NULL;
 281 }
 282
 283 void debugfs_destroy(void)
 284 {
 285         if (bat_debugfs) {
 286                 debugfs_remove_recursive(bat_debugfs);
 287                 bat_debugfs = NULL;
 288         }
 289 }
 290
 291 int debugfs_add_meshif(struct net_device *dev)
 292 {
 293         struct bat_priv *bat_priv = netdev_priv(dev);
 294         struct bat_debuginfo **bat_debug;
 295         struct dentry *file;
 296
 297         if (!bat_debugfs)
 298                 goto out;
 299
 300         bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
 301         if (!bat_priv->debug_dir)
 302                 goto out;
 303
 304         bat_socket_setup(bat_priv);
 305         debug_log_setup(bat_priv);
 306
 307         for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
 308                 file = debugfs_create_file(((*bat_debug)->attr).name,
 309                                           S_IFREG | ((*bat_debug)->attr).mode,
 310                                           bat_priv->debug_dir,
 311                                           dev, &(*bat_debug)->fops);
 312                 if (!file) {
 313                         bat_err(dev, "Can't add debugfs file: %s/%s\n",
 314                                 dev->name, ((*bat_debug)->attr).name);
 315                         goto rem_attr;
 316                 }
 317         }
 318
 319         return 0;
 320 rem_attr:
 321         debugfs_remove_recursive(bat_priv->debug_dir);
 322         bat_priv->debug_dir = NULL;
 323 out:
 324 #ifdef CONFIG_DEBUG_FS
 325         return -ENOMEM;
 326 #else
 327         return 0;
 328 #endif /* CONFIG_DEBUG_FS */
 329 }
 330
 331 void debugfs_del_meshif(struct net_device *dev)
 332 {
 333         struct bat_priv *bat_priv = netdev_priv(dev);
 334
 335         debug_log_cleanup(bat_priv);
 336
 337         if (bat_debugfs) {
 338                 debugfs_remove_recursive(bat_priv->debug_dir);
 339                 bat_priv->debug_dir = NULL;
 340         }
 341 }