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         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         unsigned long flags;
 113
 114         if ((file->f_flags & O_NONBLOCK) &&
 115             !(debug_log->log_end - debug_log->log_start))
 116                 return -EAGAIN;
 117
 118         if ((!buf) || (count < 0))
 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_irqsave(&debug_log->lock, flags);
 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_irqrestore(&debug_log->lock, flags);
 142
 143                 error = __put_user(c, buf);
 144
 145                 spin_lock_irqsave(&debug_log->lock, flags);
 146
 147                 buf++;
 148                 i++;
 149
 150         }
 151
 152         spin_unlock_irqrestore(&debug_log->lock, flags);
 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(struct 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 transtable_global_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, hna_global_seq_print_text, net_dev);
 234 }
 235
 236 static int transtable_local_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, hna_local_seq_print_text, net_dev);
 240 }
 241
 242 static int vis_data_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, vis_seq_print_text, net_dev);
 246 }
 247
 248 struct bat_debuginfo {
 249         struct attribute attr;
 250         const struct file_operations fops;
 251 };
 252
 253 #define BAT_DEBUGINFO(_name, _mode, _open)      \
 254 struct bat_debuginfo bat_debuginfo_##_name = {  \
 255         .attr = { .name = __stringify(_name),   \
 256                   .mode = _mode, },             \
 257         .fops = { .owner = THIS_MODULE,         \
 258                   .open = _open,                \
 259                   .read = seq_read,             \
 260                   .llseek = seq_lseek,          \
 261                   .release = single_release,    \
 262                 }                               \
 263 };
 264
 265 static BAT_DEBUGINFO(originators, S_IRUGO, originators_open);
 266 static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
 267 static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
 268 static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
 269
 270 static struct bat_debuginfo *mesh_debuginfos[] = {
 271         &bat_debuginfo_originators,
 272         &bat_debuginfo_transtable_global,
 273         &bat_debuginfo_transtable_local,
 274         &bat_debuginfo_vis_data,
 275         NULL,
 276 };
 277
 278 void debugfs_init(void)
 279 {
 280         bat_debugfs = debugfs_create_dir(DEBUGFS_BAT_SUBDIR, NULL);
 281         if (bat_debugfs == ERR_PTR(-ENODEV))
 282                 bat_debugfs = NULL;
 283 }
 284
 285 void debugfs_destroy(void)
 286 {
 287         if (bat_debugfs) {
 288                 debugfs_remove_recursive(bat_debugfs);
 289                 bat_debugfs = NULL;
 290         }
 291 }
 292
 293 int debugfs_add_meshif(struct net_device *dev)
 294 {
 295         struct bat_priv *bat_priv = netdev_priv(dev);
 296         struct bat_debuginfo **bat_debug;
 297         struct dentry *file;
 298
 299         if (!bat_debugfs)
 300                 goto out;
 301
 302         bat_priv->debug_dir = debugfs_create_dir(dev->name, bat_debugfs);
 303         if (!bat_priv->debug_dir)
 304                 goto out;
 305
 306         bat_socket_setup(bat_priv);
 307         debug_log_setup(bat_priv);
 308
 309         for (bat_debug = mesh_debuginfos; *bat_debug; ++bat_debug) {
 310                 file = debugfs_create_file(((*bat_debug)->attr).name,
 311                                           S_IFREG | ((*bat_debug)->attr).mode,
 312                                           bat_priv->debug_dir,
 313                                           dev, &(*bat_debug)->fops);
 314                 if (!file) {
 315                         bat_err(dev, "Can't add debugfs file: %s/%s\n",
 316                                 dev->name, ((*bat_debug)->attr).name);
 317                         goto rem_attr;
 318                 }
 319         }
 320
 321         return 0;
 322 rem_attr:
 323         debugfs_remove_recursive(bat_priv->debug_dir);
 324         bat_priv->debug_dir = NULL;
 325 out:
 326 #ifdef CONFIG_DEBUG_FS
 327         return -ENOMEM;
 328 #else
 329         return 0;
 330 #endif /* CONFIG_DEBUG_FS */
 331 }
 332
 333 void debugfs_del_meshif(struct net_device *dev)
 334 {
 335         struct bat_priv *bat_priv = netdev_priv(dev);
 336
 337         debug_log_cleanup(bat_priv);
 338
 339         if (bat_debugfs) {
 340                 debugfs_remove_recursive(bat_priv->debug_dir);
 341                 bat_priv->debug_dir = NULL;
 342         }
 343 }