drivers/net/wireless/iwlwifi/mvm/debugfs.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63 #include "mvm.h"
  64 #include "sta.h"
  65 #include "iwl-io.h"
  66
  67 struct iwl_dbgfs_mvm_ctx {
  68         struct iwl_mvm *mvm;
  69         struct ieee80211_vif *vif;
  70 };
  71
  72 static int iwl_dbgfs_open_file_generic(struct inode *inode, struct file *file)
  73 {
  74         file->private_data = inode->i_private;
  75         return 0;
  76 }
  77
  78 static ssize_t iwl_dbgfs_tx_flush_write(struct file *file,
  79                                         const char __user *user_buf,
  80                                         size_t count, loff_t *ppos)
  81 {
  82         struct iwl_mvm *mvm = file->private_data;
  83
  84         char buf[16];
  85         int buf_size, ret;
  86         u32 scd_q_msk;
  87
  88         if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
  89                 return -EIO;
  90
  91         memset(buf, 0, sizeof(buf));
  92         buf_size = min(count, sizeof(buf) - 1);
  93         if (copy_from_user(buf, user_buf, buf_size))
  94                 return -EFAULT;
  95
  96         if (sscanf(buf, "%x", &scd_q_msk) != 1)
  97                 return -EINVAL;
  98
  99         IWL_ERR(mvm, "FLUSHING queues: scd_q_msk = 0x%x\n", scd_q_msk);
 100
 101         mutex_lock(&mvm->mutex);
 102         ret =  iwl_mvm_flush_tx_path(mvm, scd_q_msk, true) ? : count;
 103         mutex_unlock(&mvm->mutex);
 104
 105         return ret;
 106 }
 107
 108 static ssize_t iwl_dbgfs_sta_drain_write(struct file *file,
 109                                          const char __user *user_buf,
 110                                          size_t count, loff_t *ppos)
 111 {
 112         struct iwl_mvm *mvm = file->private_data;
 113         struct ieee80211_sta *sta;
 114
 115         char buf[8];
 116         int buf_size, sta_id, drain, ret;
 117
 118         if (!mvm->ucode_loaded || mvm->cur_ucode != IWL_UCODE_REGULAR)
 119                 return -EIO;
 120
 121         memset(buf, 0, sizeof(buf));
 122         buf_size = min(count, sizeof(buf) - 1);
 123         if (copy_from_user(buf, user_buf, buf_size))
 124                 return -EFAULT;
 125
 126         if (sscanf(buf, "%d %d", &sta_id, &drain) != 2)
 127                 return -EINVAL;
 128
 129         mutex_lock(&mvm->mutex);
 130
 131         sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
 132                                         lockdep_is_held(&mvm->mutex));
 133         if (IS_ERR_OR_NULL(sta))
 134                 ret = -ENOENT;
 135         else
 136                 ret = iwl_mvm_drain_sta(mvm, (void *)sta->drv_priv, drain) ? :
 137                         count;
 138
 139         mutex_unlock(&mvm->mutex);
 140
 141         return ret;
 142 }
 143
 144 static ssize_t iwl_dbgfs_sram_read(struct file *file, char __user *user_buf,
 145                                    size_t count, loff_t *ppos)
 146 {
 147         struct iwl_mvm *mvm = file->private_data;
 148         const struct fw_img *img;
 149         int ofs, len, pos = 0;
 150         size_t bufsz, ret;
 151         char *buf;
 152         u8 *ptr;
 153
 154         /* default is to dump the entire data segment */
 155         if (!mvm->dbgfs_sram_offset && !mvm->dbgfs_sram_len) {
 156                 mvm->dbgfs_sram_offset = 0x800000;
 157                 if (!mvm->ucode_loaded)
 158                         return -EINVAL;
 159                 img = &mvm->fw->img[mvm->cur_ucode];
 160                 mvm->dbgfs_sram_len = img->sec[IWL_UCODE_SECTION_DATA].len;
 161         }
 162         len = mvm->dbgfs_sram_len;
 163
 164         bufsz = len * 4 + 256;
 165         buf = kzalloc(bufsz, GFP_KERNEL);
 166         if (!buf)
 167                 return -ENOMEM;
 168
 169         ptr = kzalloc(len, GFP_KERNEL);
 170         if (!ptr) {
 171                 kfree(buf);
 172                 return -ENOMEM;
 173         }
 174
 175         pos += scnprintf(buf + pos, bufsz - pos, "sram_len: 0x%x\n", len);
 176         pos += scnprintf(buf + pos, bufsz - pos, "sram_offset: 0x%x\n",
 177                          mvm->dbgfs_sram_offset);
 178
 179         iwl_trans_read_mem_bytes(mvm->trans,
 180                                  mvm->dbgfs_sram_offset,
 181                                  ptr, len);
 182         for (ofs = 0; ofs < len; ofs += 16) {
 183                 pos += scnprintf(buf + pos, bufsz - pos, "0x%.4x ", ofs);
 184                 hex_dump_to_buffer(ptr + ofs, 16, 16, 1, buf + pos,
 185                                    bufsz - pos, false);
 186                 pos += strlen(buf + pos);
 187                 if (bufsz - pos > 0)
 188                         buf[pos++] = '\n';
 189         }
 190
 191         ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 192
 193         kfree(buf);
 194         kfree(ptr);
 195
 196         return ret;
 197 }
 198
 199 static ssize_t iwl_dbgfs_sram_write(struct file *file,
 200                                     const char __user *user_buf, size_t count,
 201                                     loff_t *ppos)
 202 {
 203         struct iwl_mvm *mvm = file->private_data;
 204         char buf[64];
 205         int buf_size;
 206         u32 offset, len;
 207
 208         memset(buf, 0, sizeof(buf));
 209         buf_size = min(count, sizeof(buf) -  1);
 210         if (copy_from_user(buf, user_buf, buf_size))
 211                 return -EFAULT;
 212
 213         if (sscanf(buf, "%x,%x", &offset, &len) == 2) {
 214                 if ((offset & 0x3) || (len & 0x3))
 215                         return -EINVAL;
 216                 mvm->dbgfs_sram_offset = offset;
 217                 mvm->dbgfs_sram_len = len;
 218         } else {
 219                 mvm->dbgfs_sram_offset = 0;
 220                 mvm->dbgfs_sram_len = 0;
 221         }
 222
 223         return count;
 224 }
 225
 226 static ssize_t iwl_dbgfs_stations_read(struct file *file, char __user *user_buf,
 227                                        size_t count, loff_t *ppos)
 228 {
 229         struct iwl_mvm *mvm = file->private_data;
 230         struct ieee80211_sta *sta;
 231         char buf[400];
 232         int i, pos = 0, bufsz = sizeof(buf);
 233
 234         mutex_lock(&mvm->mutex);
 235
 236         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 237                 pos += scnprintf(buf + pos, bufsz - pos, "%.2d: ", i);
 238                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 239                                                 lockdep_is_held(&mvm->mutex));
 240                 if (!sta)
 241                         pos += scnprintf(buf + pos, bufsz - pos, "N/A\n");
 242                 else if (IS_ERR(sta))
 243                         pos += scnprintf(buf + pos, bufsz - pos, "%ld\n",
 244                                          PTR_ERR(sta));
 245                 else
 246                         pos += scnprintf(buf + pos, bufsz - pos, "%pM\n",
 247                                          sta->addr);
 248         }
 249
 250         mutex_unlock(&mvm->mutex);
 251
 252         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
 253 }
 254
 255 static ssize_t iwl_dbgfs_power_down_allow_write(struct file *file,
 256                                                 const char __user *user_buf,
 257                                                 size_t count, loff_t *ppos)
 258 {
 259         struct iwl_mvm *mvm = file->private_data;
 260         char buf[8] = {};
 261         int allow;
 262
 263         if (!mvm->ucode_loaded)
 264                 return -EIO;
 265
 266         if (copy_from_user(buf, user_buf, sizeof(buf)))
 267                 return -EFAULT;
 268
 269         if (sscanf(buf, "%d", &allow) != 1)
 270                 return -EINVAL;
 271
 272         IWL_DEBUG_POWER(mvm, "%s device power down\n",
 273                         allow ? "allow" : "prevent");
 274
 275         /*
 276          * TODO: Send REPLY_DEBUG_CMD (0xf0) when FW support it
 277          */
 278
 279         return count;
 280 }
 281
 282 static ssize_t iwl_dbgfs_power_down_d3_allow_write(struct file *file,
 283                                                    const char __user *user_buf,
 284                                                    size_t count, loff_t *ppos)
 285 {
 286         struct iwl_mvm *mvm = file->private_data;
 287         char buf[8] = {};
 288         int allow;
 289
 290         if (copy_from_user(buf, user_buf, sizeof(buf)))
 291                 return -EFAULT;
 292
 293         if (sscanf(buf, "%d", &allow) != 1)
 294                 return -EINVAL;
 295
 296         IWL_DEBUG_POWER(mvm, "%s device power down in d3\n",
 297                         allow ? "allow" : "prevent");
 298
 299         /*
 300          * TODO: When WoWLAN FW alive notification happens, driver will send
 301          * REPLY_DEBUG_CMD setting power_down_allow flag according to
 302          * mvm->prevent_power_down_d3
 303          */
 304         mvm->prevent_power_down_d3 = !allow;
 305
 306         return count;
 307 }
 308
 309 #define MVM_DEBUGFS_READ_FILE_OPS(name)                                 \
 310 static const struct file_operations iwl_dbgfs_##name##_ops = {  \
 311         .read = iwl_dbgfs_##name##_read,                                \
 312         .open = iwl_dbgfs_open_file_generic,                            \
 313         .llseek = generic_file_llseek,                                  \
 314 }
 315
 316 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name)                           \
 317 static const struct file_operations iwl_dbgfs_##name##_ops = {  \
 318         .write = iwl_dbgfs_##name##_write,                              \
 319         .read = iwl_dbgfs_##name##_read,                                \
 320         .open = iwl_dbgfs_open_file_generic,                            \
 321         .llseek = generic_file_llseek,                                  \
 322 };
 323
 324 #define MVM_DEBUGFS_WRITE_FILE_OPS(name)                                \
 325 static const struct file_operations iwl_dbgfs_##name##_ops = {  \
 326         .write = iwl_dbgfs_##name##_write,                              \
 327         .open = iwl_dbgfs_open_file_generic,                            \
 328         .llseek = generic_file_llseek,                                  \
 329 };
 330
 331 #define MVM_DEBUGFS_ADD_FILE(name, parent, mode) do {                   \
 332                 if (!debugfs_create_file(#name, mode, parent, mvm,      \
 333                                          &iwl_dbgfs_##name##_ops))      \
 334                         goto err;                                       \
 335         } while (0)
 336
 337 #define MVM_DEBUGFS_ADD_FILE_VIF(name, parent, mode) do {               \
 338                 if (!debugfs_create_file(#name, mode, parent, vif,      \
 339                                          &iwl_dbgfs_##name##_ops))      \
 340                         goto err;                                       \
 341         } while (0)
 342
 343 /* Device wide debugfs entries */
 344 MVM_DEBUGFS_WRITE_FILE_OPS(tx_flush);
 345 MVM_DEBUGFS_WRITE_FILE_OPS(sta_drain);
 346 MVM_DEBUGFS_READ_WRITE_FILE_OPS(sram);
 347 MVM_DEBUGFS_READ_FILE_OPS(stations);
 348 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_allow);
 349 MVM_DEBUGFS_WRITE_FILE_OPS(power_down_d3_allow);
 350
 351 int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 352 {
 353         char buf[100];
 354
 355         mvm->debugfs_dir = dbgfs_dir;
 356
 357         MVM_DEBUGFS_ADD_FILE(tx_flush, mvm->debugfs_dir, S_IWUSR);
 358         MVM_DEBUGFS_ADD_FILE(sta_drain, mvm->debugfs_dir, S_IWUSR);
 359         MVM_DEBUGFS_ADD_FILE(sram, mvm->debugfs_dir, S_IWUSR | S_IRUSR);
 360         MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, S_IRUSR);
 361         MVM_DEBUGFS_ADD_FILE(power_down_allow, mvm->debugfs_dir, S_IWUSR);
 362         MVM_DEBUGFS_ADD_FILE(power_down_d3_allow, mvm->debugfs_dir, S_IWUSR);
 363
 364         /*
 365          * Create a symlink with mac80211. It will be removed when mac80211
 366          * exists (before the opmode exists which removes the target.)
 367          */
 368         snprintf(buf, 100, "../../%s/%s",
 369                  dbgfs_dir->d_parent->d_parent->d_name.name,
 370                  dbgfs_dir->d_parent->d_name.name);
 371         if (!debugfs_create_symlink("iwlwifi", mvm->hw->wiphy->debugfsdir, buf))
 372                 goto err;
 373
 374         return 0;
 375 err:
 376         IWL_ERR(mvm, "Can't create the mvm debugfs directory\n");
 377         return -ENOMEM;
 378 }