drivers/net/wireless/intel/iwlwifi/fw/debugfs.c

   1 /******************************************************************************
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   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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  13  * it under the terms of version 2 of the GNU General Public License as
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  32  *
  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  34  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  35  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
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  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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  64  *****************************************************************************/
  65 #include "api/commands.h"
  66 #include "debugfs.h"
  67 #include "dbg.h"
  68
  69 #define FWRT_DEBUGFS_READ_FILE_OPS(name)                                \
  70 static ssize_t iwl_dbgfs_##name##_read(struct iwl_fw_runtime *fwrt,     \
  71                                        char *buf, size_t count,         \
  72                                        loff_t *ppos);                   \
  73 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
  74         .read = iwl_dbgfs_##name##_read,                                \
  75         .open = simple_open,                                            \
  76         .llseek = generic_file_llseek,                                  \
  77 }
  78
  79 #define FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen)                        \
  80 static ssize_t iwl_dbgfs_##name##_write(struct iwl_fw_runtime *fwrt,    \
  81                                         char *buf, size_t count,        \
  82                                         loff_t *ppos);                  \
  83 static ssize_t _iwl_dbgfs_##name##_write(struct file *file,             \
  84                                          const char __user *user_buf,   \
  85                                          size_t count, loff_t *ppos)    \
  86 {                                                                       \
  87         struct iwl_fw_runtime *fwrt = file->private_data;               \
  88         char buf[buflen] = {};                                          \
  89         size_t buf_size = min(count, sizeof(buf) -  1);                 \
  90                                                                         \
  91         if (copy_from_user(buf, user_buf, buf_size))                    \
  92                 return -EFAULT;                                         \
  93                                                                         \
  94         return iwl_dbgfs_##name##_write(fwrt, buf, buf_size, ppos);     \
  95 }
  96
  97 #define FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, buflen)                  \
  98 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen)                                \
  99 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
 100         .write = _iwl_dbgfs_##name##_write,                             \
 101         .read = iwl_dbgfs_##name##_read,                                \
 102         .open = simple_open,                                            \
 103         .llseek = generic_file_llseek,                                  \
 104 }
 105
 106 #define FWRT_DEBUGFS_WRITE_FILE_OPS(name, buflen)                       \
 107 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen)                                \
 108 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
 109         .write = _iwl_dbgfs_##name##_write,                             \
 110         .open = simple_open,                                            \
 111         .llseek = generic_file_llseek,                                  \
 112 }
 113
 114 #define FWRT_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode) do {     \
 115                 if (!debugfs_create_file(alias, mode, parent, fwrt,     \
 116                                          &iwl_dbgfs_##name##_ops))      \
 117                         goto err;                                       \
 118         } while (0)
 119 #define FWRT_DEBUGFS_ADD_FILE(name, parent, mode) \
 120         FWRT_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)
 121
 122 static int iwl_fw_send_timestamp_marker_cmd(struct iwl_fw_runtime *fwrt)
 123 {
 124         struct iwl_mvm_marker marker = {
 125                 .dw_len = sizeof(struct iwl_mvm_marker) / 4,
 126                 .marker_id = MARKER_ID_SYNC_CLOCK,
 127
 128                 /* the real timestamp is taken from the ftrace clock
 129                  * this is for finding the match between fw and kernel logs
 130                  */
 131                 .timestamp = cpu_to_le64(fwrt->timestamp.seq++),
 132         };
 133
 134         struct iwl_host_cmd hcmd = {
 135                 .id = MARKER_CMD,
 136                 .flags = CMD_ASYNC,
 137                 .data[0] = &marker,
 138                 .len[0] = sizeof(marker),
 139         };
 140
 141         return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 142 }
 143
 144 static void iwl_fw_timestamp_marker_wk(struct work_struct *work)
 145 {
 146         int ret;
 147         struct iwl_fw_runtime *fwrt =
 148                 container_of(work, struct iwl_fw_runtime, timestamp.wk.work);
 149         unsigned long delay = fwrt->timestamp.delay;
 150
 151         ret = iwl_fw_send_timestamp_marker_cmd(fwrt);
 152         if (!ret && delay)
 153                 schedule_delayed_work(&fwrt->timestamp.wk,
 154                                       round_jiffies_relative(delay));
 155         else
 156                 IWL_INFO(fwrt,
 157                          "stopping timestamp_marker, ret: %d, delay: %u\n",
 158                          ret, jiffies_to_msecs(delay) / 1000);
 159 }
 160
 161 void iwl_fw_trigger_timestamp(struct iwl_fw_runtime *fwrt, u32 delay)
 162 {
 163         IWL_INFO(fwrt,
 164                  "starting timestamp_marker trigger with delay: %us\n",
 165                  delay);
 166
 167         iwl_fw_cancel_timestamp(fwrt);
 168
 169         fwrt->timestamp.delay = msecs_to_jiffies(delay * 1000);
 170
 171         schedule_delayed_work(&fwrt->timestamp.wk,
 172                               round_jiffies_relative(fwrt->timestamp.delay));
 173 }
 174
 175 static ssize_t iwl_dbgfs_timestamp_marker_write(struct iwl_fw_runtime *fwrt,
 176                                                 char *buf, size_t count,
 177                                                 loff_t *ppos)
 178 {
 179         int ret;
 180         u32 delay;
 181
 182         ret = kstrtou32(buf, 10, &delay);
 183         if (ret < 0)
 184                 return ret;
 185
 186         iwl_fw_trigger_timestamp(fwrt, delay);
 187
 188         return count;
 189 }
 190
 191 FWRT_DEBUGFS_WRITE_FILE_OPS(timestamp_marker, 10);
 192
 193 int iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 194                             struct dentry *dbgfs_dir)
 195 {
 196         INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
 197         FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
 198         return 0;
 199 err:
 200         IWL_ERR(fwrt, "Can't create the fwrt debugfs directory\n");
 201         return -ENOMEM;
 202 }