net/batman-adv/bat_debugfs.c

   1 /*
   2  * Copyright (C) 2010-2011 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 "gateway_common.h"
  31 #include "gateway_client.h"
  32 #include "soft-interface.h"
  33 #include "vis.h"
  34 #include "icmp_socket.h"
  35
  36 static struct dentry *bat_debugfs;
  37
  38 #ifdef CONFIG_BATMAN_ADV_DEBUG
  39 #define LOG_BUFF_MASK (log_buff_len-1)
  40 #define LOG_BUFF(idx) (debug_log->log_buff[(idx) & LOG_BUFF_MASK])
  41
  42 static int log_buff_len = LOG_BUF_LEN;
  43
  44 static void emit_log_char(struct debug_log *debug_log, char c)
  45 {
  46         LOG_BUFF(debug_log->log_end) = c;
  47         debug_log->log_end++;
  48
  49         if (debug_log->log_end - debug_log->log_start > log_buff_len)
  50                 debug_log->log_start = debug_log->log_end - log_buff_len;
  51 }
  52
  53 __printf(2, 3)
  54 static int fdebug_log(struct debug_log *debug_log, const char *fmt, ...)
  55 {
  56         va_list args;
  57         static char debug_log_buf[256];
  58         char *p;
  59
  60         if (!debug_log)
  61                 return 0;
  62
  63         spin_lock_bh(&debug_log->lock);
  64         va_start(args, fmt);
  65         vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
  66         va_end(args);
  67
  68         for (p = debug_log_buf; *p != 0; p++)
  69                 emit_log_char(debug_log, *p);
  70
  71         spin_unlock_bh(&debug_log->lock);
  72
  73         wake_up(&debug_log->queue_wait);
  74
  75         return 0;
  76 }
  77
  78 int debug_log(struct bat_priv *bat_priv, const char *fmt, ...)
  79 {
  80         va_list args;
  81         char tmp_log_buf[256];
  82
  83         va_start(args, fmt);
  84         vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
  85         fdebug_log(bat_priv->debug_log, "[%10lu] %s",
  86                    (jiffies / HZ), tmp_log_buf);
  87         va_end(args);
  88
  89         return 0;
  90 }
  91
  92 static int log_open(struct inode *inode, struct file *file)
  93 {
  94         nonseekable_open(inode, file);
  95         file->private_data = inode->i_private;
  96         inc_module_count();
  97         return 0;
  98 }
  99
 100 static int log_release(struct inode *inode, struct file *file)
 101 {
 102         dec_module_count();
 103         return 0;
 104 }
 105
 106 static ssize_t log_read(struct file *file, char __user *buf,
 107                         size_t count, loff_t *ppos)
 108 {
 109         struct bat_priv *bat_priv = file->private_data;
 110         struct debug_log *debug_log = bat_priv->debug_log;
 111         int error, i = 0;
 112         char c;
 113
 114         if ((file->f_flags & O_NONBLOCK) &&
 115             !(debug_log->log_end - debug_log->log_start))
 116                 return -EAGAIN;
 117
 118         if (!buf)
 119                 return -EINVAL;
 120
 121         if (count == 0)
 122                 return 0;
 123
 124         if (!access_ok(VERIFY_WRITE, buf, count))
 125                 return -EFAULT;
 126
 127         error = wait_event_interruptible(debug_log->queue_wait,
 128                                 (debug_log->log_start - debug_log->log_end));
 129
 130         if (error)
 131                 return error;
 132
 133         spin_lock_bh(&debug_log->lock);
 134
 135         while ((!error) && (i < count) &&
 136                (debug_log->log_start != debug_log->log_end)) {
 137                 c = LOG_BUFF(debug_log->log_start);
 138
 139                 debug_log->log_start++;
 140
 141                 spin_unlock_bh(&debug_log->lock);
 142
 143                 error = __put_user(c, buf);
 144
 145                 spin_lock_bh(&debug_log->lock);
 146
 147                 buf++;
 148                 i++;
 149
 150         }
 151
 152         spin_unlock_bh(&debug_log->lock);
 153
 154         if (!error)
 155                 return i;
 156
 157         return error;
 158 }
 159
 160 static unsigned int log_poll(struct file *file, poll_table *wait)
 161 {
 162         struct bat_priv *bat_priv = file->private_data;
 163         struct debug_log *debug_log = bat_priv->debug_log;
 164
 165         poll_wait(file, &debug_log->queue_wait, wait);
 166
 167         if (debug_log->log_end - debug_log->log_start)
 168                 return POLLIN | POLLRDNORM;
 169
 170         return 0;
 171 }
 172
 173 static const struct file_operations log_fops = {
 174         .open           = log_open,
 175         .release        = log_release,
 176         .read           = log_read,
 177         .poll           = log_poll,
 178         .llseek         = no_llseek,
 179 };
 180
 181 static int debug_log_setup(struct bat_priv *bat_priv)
 182 {
 183         struct dentry *d;
 184
 185         if (!bat_priv->debug_dir)
 186                 goto err;
 187
 188         bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
 189         if (!bat_priv->debug_log)
 190                 goto err;
 191
 192         spin_lock_init(&bat_priv->debug_log->lock);
 193         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 194
 195         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 196                                 bat_priv->debug_dir, bat_priv, &log_fops);
 197         if (d)
 198                 goto err;
 199
 200         return 0;
 201
 202 err:
 203         return 1;
 204 }
 205
 206 static void debug_log_cleanup(struct bat_priv *bat_priv)
 207 {
 208         kfree(bat_priv->debug_log);
 209         bat_priv->debug_log = NULL;
 210 }
 211 #else /* CONFIG_BATMAN_ADV_DEBUG */
 212 static int debug_log_setup(struct bat_priv *bat_priv)
 213 {
 214         bat_priv->debug_log = NULL;
 215         return 0;
 216 }
 217
 218 static void debug_log_cleanup(struct bat_priv *bat_priv)
 219 {
 220         return;
 221 }
 222 #endif
 223
 224 static int originators_open(struct inode *inode, struct file *file)
 225 {
 226         struct net_device *net_dev = (struct net_device *)inode->i_private;
 227         return single_open(file, orig_seq_print_text, net_dev);
 228 }
 229
 230 static int gateways_open(struct inode *inode, struct file *file)
 231 {
 232         struct net_device *net_dev = (struct net_device *)inode->i_private;
 233         return single_open(file, gw_client_seq_print_text, net_dev);
 234 }
 235
 236 static int softif_neigh_open(struct inode *inode, struct file *file)
 237 {
 238         struct net_device *net_dev = (struct net_device *)inode->i_private;
 239         return single_open(file, softif_neigh_seq_print_text, net_dev);
 240 }
 241
 242 static int transtable_global_open(struct inode *inode, struct file *file)
 243 {
 244         struct net_device *net_dev = (struct net_device *)inode->i_private;
 245         return single_open(file, tt_global_seq_print_text, net_dev);
 246 }
 247
 248 static int transtable_local_open(struct inode *inode, struct file *file)
 249 {
 250         struct net_device *net_dev = (struct net_device *)inode->i_private;
 251         return single_open(file, tt_local_seq_print_text, net_dev);
 252 }
 253
 254 static int vis_data_open(struct inode *inode, struct file *file)
 255 {
 256         struct net_device *net_dev = (struct net_device *)inode->i_private;
 257         return single_open(file, vis_seq_print_text, net_dev);
 258 }
 259
 260 struct bat_debuginfo {
 261         struct attribute attr;
 262         const struct file_operations fops;
 263 };
 264
 265 #define BAT_DEBUGINFO(_name, _mode, _open)      \
 266 struct bat_debuginfo bat_debuginfo_##_name = {  \
 267         .attr = { .name = __stringify(_name),   \
 268                   .mode = _mode, },             \
 269         .fops = { .owner = THIS_MODULE,         \
 270                   .open = _open,                \
 271                   .read = seq_read,             \
 272                   .llseek = seq_lseek,          \
 273                   .release = single_release,    \
 274                 }                               \
 275 };
 276
 277 static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
 278 static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
 279 static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
 280 static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
 281 static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
 282 static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
 283
 284 static struct bat_debuginfo *mesh_debuginfos[] = {
 285         &bat_debuginfo_originators,
 286         &bat_debuginfo_gateways,
 287         &bat_debuginfo_softif_neigh,
 288         &bat_debuginfo_transtable_global,
 289         &bat_debuginfo_transtable_local,
 290         &bat_debuginfo_vis_data,
 291         NULL,
 292 };
 293
 294 void debugfs_init(void)
 295 {
 296         bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
 297         if (bat_debugfs == ERR_PTR(-ENODEV))
 298                 bat_debugfs = NULL;
 299 }
 300
 301 void debugfs_destroy(void)
 302 {
 303         if (bat_debugfs) {
 304                 debugfs_remove_recursive(bat_debugfs);
 305                 bat_debugfs = NULL;
 306         }
 307 }
 308
 309 int debugfs_add_meshif(struct net_device *dev)
 310 {
 311         struct bat_priv *bat_priv = netdev_priv(dev);
 312         struct bat_debuginfo **bat_debug;
 313         struct dentry *file;
 314
 315         if (!bat_debugfs)
 316                 goto out;
 317
 318         bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
 319         if (!bat_priv->debug_dir)
 320                 goto out;
 321
 322         bat_socket_setup(bat_priv);
 323         debug_log_setup(bat_priv);
 324
 325         for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
 326                 file = debugfs_create_file(((*bat_debug)->attr).name,
 327                                           S_IFREG | ((*bat_debug)->attr).mode,
 328                                           bat_priv->debug_dir,
 329                                           dev, &(*bat_debug)->fops);
 330                 if (!file) {
 331                         bat_err(dev, "Can't add debugfs file: %s/%s\n",
 332                                 dev->name, ((*bat_debug)->attr).name);
 333                         goto rem_attr;
 334                 }
 335         }
 336
 337         return 0;
 338 rem_attr:
 339         debugfs_remove_recursive(bat_priv->debug_dir);
 340         bat_priv->debug_dir = NULL;
 341 out:
 342 #ifdef CONFIG_DEBUG_FS
 343         return -ENOMEM;
 344 #else
 345         return 0;
 346 #endif /* CONFIG_DEBUG_FS */
 347 }
 348
 349 void debugfs_del_meshif(struct net_device *dev)
 350 {
 351         struct bat_priv *bat_priv = netdev_priv(dev);
 352
 353         debug_log_cleanup(bat_priv);
 354
 355         if (bat_debugfs) {
 356                 debugfs_remove_recursive(bat_priv->debug_dir);
 357                 bat_priv->debug_dir = NULL;
 358         }
 359 }