drivers/net/wimax/i2400m/debugfs.c

   1 /*
   2  * Intel Wireless WiMAX Connection 2400m
   3  * Debugfs interfaces to manipulate driver and device information
   4  *
   5  *
   6  * Copyright (C) 2007 Intel Corporation <linux-wimax@intel.com>
   7  * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License version
  11  * 2 as published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21  * 02110-1301, USA.
  22  */
  23
  24 #include <linux/debugfs.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/etherdevice.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/device.h>
  29 #include "i2400m.h"
  30
  31
  32 #define D_SUBMODULE debugfs
  33 #include "debug-levels.h"
  34
  35 static
  36 int debugfs_netdev_queue_stopped_get(void *data, u64 *val)
  37 {
  38         struct i2400m *i2400m = data;
  39         *val = netif_queue_stopped(i2400m->wimax_dev.net_dev);
  40         return 0;
  41 }
  42 DEFINE_SIMPLE_ATTRIBUTE(fops_netdev_queue_stopped,
  43                         debugfs_netdev_queue_stopped_get,
  44                         NULL, "%llu\n");
  45
  46
  47 static
  48 struct dentry *debugfs_create_netdev_queue_stopped(
  49         const char *name, struct dentry *parent, struct i2400m *i2400m)
  50 {
  51         return debugfs_create_file(name, 0400, parent, i2400m,
  52                                    &fops_netdev_queue_stopped);
  53 }
  54
  55
  56 /*
  57  * inode->i_private has the @data argument to debugfs_create_file()
  58  */
  59 static
  60 int i2400m_stats_open(struct inode *inode, struct file *filp)
  61 {
  62         filp->private_data = inode->i_private;
  63         return 0;
  64 }
  65
  66 /*
  67  * We don't allow partial reads of this file, as then the reader would
  68  * get weirdly confused data as it is updated.
  69  *
  70  * So or you read it all or nothing; if you try to read with an offset
  71  * != 0, we consider you are done reading.
  72  */
  73 static
  74 ssize_t i2400m_rx_stats_read(struct file *filp, char __user *buffer,
  75                              size_t count, loff_t *ppos)
  76 {
  77         struct i2400m *i2400m = filp->private_data;
  78         char buf[128];
  79         unsigned long flags;
  80
  81         if (*ppos != 0)
  82                 return 0;
  83         if (count < sizeof(buf))
  84                 return -ENOSPC;
  85         spin_lock_irqsave(&i2400m->rx_lock, flags);
  86         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
  87                  i2400m->rx_pl_num, i2400m->rx_pl_min,
  88                  i2400m->rx_pl_max, i2400m->rx_num,
  89                  i2400m->rx_size_acc,
  90                  i2400m->rx_size_min, i2400m->rx_size_max);
  91         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
  92         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
  93 }
  94
  95
  96 /* Any write clears the stats */
  97 static
  98 ssize_t i2400m_rx_stats_write(struct file *filp, const char __user *buffer,
  99                               size_t count, loff_t *ppos)
 100 {
 101         struct i2400m *i2400m = filp->private_data;
 102         unsigned long flags;
 103
 104         spin_lock_irqsave(&i2400m->rx_lock, flags);
 105         i2400m->rx_pl_num = 0;
 106         i2400m->rx_pl_max = 0;
 107         i2400m->rx_pl_min = UINT_MAX;
 108         i2400m->rx_num = 0;
 109         i2400m->rx_size_acc = 0;
 110         i2400m->rx_size_min = UINT_MAX;
 111         i2400m->rx_size_max = 0;
 112         spin_unlock_irqrestore(&i2400m->rx_lock, flags);
 113         return count;
 114 }
 115
 116 static
 117 const struct file_operations i2400m_rx_stats_fops = {
 118         .owner =        THIS_MODULE,
 119         .open =         i2400m_stats_open,
 120         .read =         i2400m_rx_stats_read,
 121         .write =        i2400m_rx_stats_write,
 122 };
 123
 124
 125 /* See i2400m_rx_stats_read() */
 126 static
 127 ssize_t i2400m_tx_stats_read(struct file *filp, char __user *buffer,
 128                              size_t count, loff_t *ppos)
 129 {
 130         struct i2400m *i2400m = filp->private_data;
 131         char buf[128];
 132         unsigned long flags;
 133
 134         if (*ppos != 0)
 135                 return 0;
 136         if (count < sizeof(buf))
 137                 return -ENOSPC;
 138         spin_lock_irqsave(&i2400m->tx_lock, flags);
 139         snprintf(buf, sizeof(buf), "%u %u %u %u %u %u %u\n",
 140                  i2400m->tx_pl_num, i2400m->tx_pl_min,
 141                  i2400m->tx_pl_max, i2400m->tx_num,
 142                  i2400m->tx_size_acc,
 143                  i2400m->tx_size_min, i2400m->tx_size_max);
 144         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
 145         return simple_read_from_buffer(buffer, count, ppos, buf, strlen(buf));
 146 }
 147
 148 /* Any write clears the stats */
 149 static
 150 ssize_t i2400m_tx_stats_write(struct file *filp, const char __user *buffer,
 151                               size_t count, loff_t *ppos)
 152 {
 153         struct i2400m *i2400m = filp->private_data;
 154         unsigned long flags;
 155
 156         spin_lock_irqsave(&i2400m->tx_lock, flags);
 157         i2400m->tx_pl_num = 0;
 158         i2400m->tx_pl_max = 0;
 159         i2400m->tx_pl_min = UINT_MAX;
 160         i2400m->tx_num = 0;
 161         i2400m->tx_size_acc = 0;
 162         i2400m->tx_size_min = UINT_MAX;
 163         i2400m->tx_size_max = 0;
 164         spin_unlock_irqrestore(&i2400m->tx_lock, flags);
 165         return count;
 166 }
 167
 168 static
 169 const struct file_operations i2400m_tx_stats_fops = {
 170         .owner =        THIS_MODULE,
 171         .open =         i2400m_stats_open,
 172         .read =         i2400m_tx_stats_read,
 173         .write =        i2400m_tx_stats_write,
 174 };
 175
 176
 177 /* Write 1 to ask the device to go into suspend */
 178 static
 179 int debugfs_i2400m_suspend_set(void *data, u64 val)
 180 {
 181         int result;
 182         struct i2400m *i2400m = data;
 183         result = i2400m_cmd_enter_powersave(i2400m);
 184         if (result >= 0)
 185                 result = 0;
 186         return result;
 187 }
 188 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_suspend,
 189                         NULL, debugfs_i2400m_suspend_set,
 190                         "%llu\n");
 191
 192 static
 193 struct dentry *debugfs_create_i2400m_suspend(
 194         const char *name, struct dentry *parent, struct i2400m *i2400m)
 195 {
 196         return debugfs_create_file(name, 0200, parent, i2400m,
 197                                    &fops_i2400m_suspend);
 198 }
 199
 200
 201 /*
 202  * Reset the device
 203  *
 204  * Write 0 to ask the device to soft reset, 1 to cold reset, 2 to bus
 205  * reset (as defined by enum i2400m_reset_type).
 206  */
 207 static
 208 int debugfs_i2400m_reset_set(void *data, u64 val)
 209 {
 210         int result;
 211         struct i2400m *i2400m = data;
 212         enum i2400m_reset_type rt = val;
 213         switch(rt) {
 214         case I2400M_RT_WARM:
 215         case I2400M_RT_COLD:
 216         case I2400M_RT_BUS:
 217                 result = i2400m->bus_reset(i2400m, rt);
 218                 if (result >= 0)
 219                         result = 0;
 220         default:
 221                 result = -EINVAL;
 222         }
 223         return result;
 224 }
 225 DEFINE_SIMPLE_ATTRIBUTE(fops_i2400m_reset,
 226                         NULL, debugfs_i2400m_reset_set,
 227                         "%llu\n");
 228
 229 static
 230 struct dentry *debugfs_create_i2400m_reset(
 231         const char *name, struct dentry *parent, struct i2400m *i2400m)
 232 {
 233         return debugfs_create_file(name, 0200, parent, i2400m,
 234                                    &fops_i2400m_reset);
 235 }
 236
 237
 238 #define __debugfs_register(prefix, name, parent)                        \
 239 do {                                                                    \
 240         result = d_level_register_debugfs(prefix, name, parent);        \
 241         if (result < 0)                                                 \
 242                 goto error;                                             \
 243 } while (0)
 244
 245
 246 int i2400m_debugfs_add(struct i2400m *i2400m)
 247 {
 248         int result;
 249         struct device *dev = i2400m_dev(i2400m);
 250         struct dentry *dentry = i2400m->wimax_dev.debugfs_dentry;
 251         struct dentry *fd;
 252
 253         dentry = debugfs_create_dir("i2400m", dentry);
 254         result = PTR_ERR(dentry);
 255         if (IS_ERR(dentry)) {
 256                 if (result == -ENODEV)
 257                         result = 0;     /* No debugfs support */
 258                 goto error;
 259         }
 260         i2400m->debugfs_dentry = dentry;
 261         __debugfs_register("dl_", control, dentry);
 262         __debugfs_register("dl_", driver, dentry);
 263         __debugfs_register("dl_", debugfs, dentry);
 264         __debugfs_register("dl_", fw, dentry);
 265         __debugfs_register("dl_", netdev, dentry);
 266         __debugfs_register("dl_", rfkill, dentry);
 267         __debugfs_register("dl_", rx, dentry);
 268         __debugfs_register("dl_", tx, dentry);
 269
 270         fd = debugfs_create_size_t("tx_in", 0400, dentry,
 271                                    &i2400m->tx_in);
 272         result = PTR_ERR(fd);
 273         if (IS_ERR(fd) && result != -ENODEV) {
 274                 dev_err(dev, "Can't create debugfs entry "
 275                         "tx_in: %d\n", result);
 276                 goto error;
 277         }
 278
 279         fd = debugfs_create_size_t("tx_out", 0400, dentry,
 280                                    &i2400m->tx_out);
 281         result = PTR_ERR(fd);
 282         if (IS_ERR(fd) && result != -ENODEV) {
 283                 dev_err(dev, "Can't create debugfs entry "
 284                         "tx_out: %d\n", result);
 285                 goto error;
 286         }
 287
 288         fd = debugfs_create_u32("state", 0600, dentry,
 289                                 &i2400m->state);
 290         result = PTR_ERR(fd);
 291         if (IS_ERR(fd) && result != -ENODEV) {
 292                 dev_err(dev, "Can't create debugfs entry "
 293                         "state: %d\n", result);
 294                 goto error;
 295         }
 296
 297         /*
 298          * Trace received messages from user space
 299          *
 300          * In order to tap the bidirectional message stream in the
 301          * 'msg' pipe, user space can read from the 'msg' pipe;
 302          * however, due to limitations in libnl, we can't know what
 303          * the different applications are sending down to the kernel.
 304          *
 305          * So we have this hack where the driver will echo any message
 306          * received on the msg pipe from user space [through a call to
 307          * wimax_dev->op_msg_from_user() into
 308          * i2400m_op_msg_from_user()] into the 'trace' pipe that this
 309          * driver creates.
 310          *
 311          * So then, reading from both the 'trace' and 'msg' pipes in
 312          * user space will provide a full dump of the traffic.
 313          *
 314          * Write 1 to activate, 0 to clear.
 315          *
 316          * It is not really very atomic, but it is also not too
 317          * critical.
 318          */
 319         fd = debugfs_create_u8("trace_msg_from_user", 0600, dentry,
 320                                &i2400m->trace_msg_from_user);
 321         result = PTR_ERR(fd);
 322         if (IS_ERR(fd) && result != -ENODEV) {
 323                 dev_err(dev, "Can't create debugfs entry "
 324                         "trace_msg_from_user: %d\n", result);
 325                 goto error;
 326         }
 327
 328         fd = debugfs_create_netdev_queue_stopped("netdev_queue_stopped",
 329                                                  dentry, i2400m);
 330         result = PTR_ERR(fd);
 331         if (IS_ERR(fd) && result != -ENODEV) {
 332                 dev_err(dev, "Can't create debugfs entry "
 333                         "netdev_queue_stopped: %d\n", result);
 334                 goto error;
 335         }
 336
 337         fd = debugfs_create_file("rx_stats", 0600, dentry, i2400m,
 338                                  &i2400m_rx_stats_fops);
 339         result = PTR_ERR(fd);
 340         if (IS_ERR(fd) && result != -ENODEV) {
 341                 dev_err(dev, "Can't create debugfs entry "
 342                         "rx_stats: %d\n", result);
 343                 goto error;
 344         }
 345
 346         fd = debugfs_create_file("tx_stats", 0600, dentry, i2400m,
 347                                  &i2400m_tx_stats_fops);
 348         result = PTR_ERR(fd);
 349         if (IS_ERR(fd) && result != -ENODEV) {
 350                 dev_err(dev, "Can't create debugfs entry "
 351                         "tx_stats: %d\n", result);
 352                 goto error;
 353         }
 354
 355         fd = debugfs_create_i2400m_suspend("suspend", dentry, i2400m);
 356         result = PTR_ERR(fd);
 357         if (IS_ERR(fd) && result != -ENODEV) {
 358                 dev_err(dev, "Can't create debugfs entry suspend: %d\n",
 359                         result);
 360                 goto error;
 361         }
 362
 363         fd = debugfs_create_i2400m_reset("reset", dentry, i2400m);
 364         result = PTR_ERR(fd);
 365         if (IS_ERR(fd) && result != -ENODEV) {
 366                 dev_err(dev, "Can't create debugfs entry reset: %d\n", result);
 367                 goto error;
 368         }
 369
 370         result = 0;
 371 error:
 372         return result;
 373 }
 374
 375 void i2400m_debugfs_rm(struct i2400m *i2400m)
 376 {
 377         debugfs_remove_recursive(i2400m->debugfs_dentry);
 378 }