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 static int fdebug_log(struct debug_log *debug_log, char *fmt, ...)
  54 {
  55         va_list args;
  56         static char debug_log_buf[256];
  57         char *p;
  58
  59         if (!debug_log)
  60                 return 0;
  61
  62         spin_lock_bh(&debug_log->lock);
  63         va_start(args, fmt);
  64         vscnprintf(debug_log_buf, sizeof(debug_log_buf), 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_bh(&debug_log->lock);
  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         nonseekable_open(inode, file);
  94         file->private_data = inode->i_private;
  95         inc_module_count();
  96         return 0;
  97 }
  98
  99 static int log_release(struct inode *inode, struct file *file)
 100 {
 101         dec_module_count();
 102         return 0;
 103 }
 104
 105 static ssize_t log_read(struct file *file, char __user *buf,
 106                         size_t count, loff_t *ppos)
 107 {
 108         struct bat_priv *bat_priv = file->private_data;
 109         struct debug_log *debug_log = bat_priv->debug_log;
 110         int error, i = 0;
 111         char c;
 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_bh(&debug_log->lock);
 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_bh(&debug_log->lock);
 141
 142                 error = __put_user(c, buf);
 143
 144                 spin_lock_bh(&debug_log->lock);
 145
 146                 buf++;
 147                 i++;
 148
 149         }
 150
 151         spin_unlock_bh(&debug_log->lock);
 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         .llseek         = no_llseek,
 178 };
 179
 180 static int debug_log_setup(struct bat_priv *bat_priv)
 181 {
 182         struct dentry *d;
 183
 184         if (!bat_priv->debug_dir)
 185                 goto err;
 186
 187         bat_priv->debug_log = kzalloc(sizeof(struct debug_log), GFP_ATOMIC);
 188         if (!bat_priv->debug_log)
 189                 goto err;
 190
 191         spin_lock_init(&bat_priv->debug_log->lock);
 192         init_waitqueue_head(&bat_priv->debug_log->queue_wait);
 193
 194         d = debugfs_create_file("log", S_IFREG | S_IRUSR,
 195                                 bat_priv->debug_dir, bat_priv, &log_fops);
 196         if (d)
 197                 goto err;
 198
 199         return 0;
 200
 201 err:
 202         return 1;
 203 }
 204
 205 static void debug_log_cleanup(struct bat_priv *bat_priv)
 206 {
 207         kfree(bat_priv->debug_log);
 208         bat_priv->debug_log = NULL;
 209 }
 210 #else /* CONFIG_BATMAN_ADV_DEBUG */
 211 static int debug_log_setup(struct bat_priv *bat_priv)
 212 {
 213         bat_priv->debug_log = NULL;
 214         return 0;
 215 }
 216
 217 static void debug_log_cleanup(struct bat_priv *bat_priv)
 218 {
 219         return;
 220 }
 221 #endif
 222
 223 static int originators_open(struct inode *inode, struct file *file)
 224 {
 225         struct net_device *net_dev = (struct net_device *)inode->i_private;
 226         return single_open(file, orig_seq_print_text, net_dev);
 227 }
 228
 229 static int gateways_open(struct inode *inode, struct file *file)
 230 {
 231         struct net_device *net_dev = (struct net_device *)inode->i_private;
 232         return single_open(file, gw_client_seq_print_text, net_dev);
 233 }
 234
 235 static int softif_neigh_open(struct inode *inode, struct file *file)
 236 {
 237         struct net_device *net_dev = (struct net_device *)inode->i_private;
 238         return single_open(file, softif_neigh_seq_print_text, net_dev);
 239 }
 240
 241 static int transtable_global_open(struct inode *inode, struct file *file)
 242 {
 243         struct net_device *net_dev = (struct net_device *)inode->i_private;
 244         return single_open(file, tt_global_seq_print_text, net_dev);
 245 }
 246
 247 static int transtable_local_open(struct inode *inode, struct file *file)
 248 {
 249         struct net_device *net_dev = (struct net_device *)inode->i_private;
 250         return single_open(file, tt_local_seq_print_text, net_dev);
 251 }
 252
 253 static int vis_data_open(struct inode *inode, struct file *file)
 254 {
 255         struct net_device *net_dev = (struct net_device *)inode->i_private;
 256         return single_open(file, vis_seq_print_text, net_dev);
 257 }
 258
 259 struct bat_debuginfo {
 260         struct attribute attr;
 261         const struct file_operations fops;
 262 };
 263
 264 #define BAT_DEBUGINFO(_name, _mode, _open)      \
 265 struct bat_debuginfo bat_debuginfo_##_name = {  \
 266         .attr = { .name = __stringify(_name),   \
 267                   .mode = _mode, },             \
 268         .fops = { .owner = THIS_MODULE,         \
 269                   .open = _open,                \
 270                   .read = seq_read,             \
 271                   .llseek = seq_lseek,          \
 272                   .release = single_release,    \
 273                 }                               \
 274 };
 275
 276 static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
 277 static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
 278 static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
 279 static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
 280 static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
 281 static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
 282
 283 static struct bat_debuginfo *mesh_debuginfos[] = {
 284         &bat_debuginfo_originators,
 285         &bat_debuginfo_gateways,
 286         &bat_debuginfo_softif_neigh,
 287         &bat_debuginfo_transtable_global,
 288         &bat_debuginfo_transtable_local,
 289         &bat_debuginfo_vis_data,
 290         NULL,
 291 };
 292
 293 void debugfs_init(void)
 294 {
 295         bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
 296         if (bat_debugfs == ERR_PTR(-ENODEV))
 297                 bat_debugfs = NULL;
 298 }
 299
 300 void debugfs_destroy(void)
 301 {
 302         if (bat_debugfs) {
 303                 debugfs_remove_recursive(bat_debugfs);
 304                 bat_debugfs = NULL;
 305         }
 306 }
 307
 308 int debugfs_add_meshif(struct net_device *dev)
 309 {
 310         struct bat_priv *bat_priv = netdev_priv(dev);
 311         struct bat_debuginfo **bat_debug;
 312         struct dentry *file;
 313
 314         if (!bat_debugfs)
 315                 goto out;
 316
 317         bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
 318         if (!bat_priv->debug_dir)
 319                 goto out;
 320
 321         bat_socket_setup(bat_priv);
 322         debug_log_setup(bat_priv);
 323
 324         for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
 325                 file = debugfs_create_file(((*bat_debug)->attr).name,
 326                                           S_IFREG | ((*bat_debug)->attr).mode,
 327                                           bat_priv->debug_dir,
 328                                           dev, &(*bat_debug)->fops);
 329                 if (!file) {
 330                         bat_err(dev, "Can't add debugfs file: %s/%s\n",
 331                                 dev->name, ((*bat_debug)->attr).name);
 332                         goto rem_attr;
 333                 }
 334         }
 335
 336         return 0;
 337 rem_attr:
 338         debugfs_remove_recursive(bat_priv->debug_dir);
 339         bat_priv->debug_dir = NULL;
 340 out:
 341 #ifdef CONFIG_DEBUG_FS
 342         return -ENOMEM;
 343 #else
 344         return 0;
 345 #endif /* CONFIG_DEBUG_FS */
 346 }
 347
 348 void debugfs_del_meshif(struct net_device *dev)
 349 {
 350         struct bat_priv *bat_priv = netdev_priv(dev);
 351
 352         debug_log_cleanup(bat_priv);
 353
 354         if (bat_debugfs) {
 355                 debugfs_remove_recursive(bat_priv->debug_dir);
 356                 bat_priv->debug_dir = NULL;
 357         }
 358 }