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

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2012-2014, 2018-2020 Intel Corporation
   4  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
   5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
   6  */
   7 #include "api/commands.h"
   8 #include "debugfs.h"
   9 #include "dbg.h"
  10 #include <linux/seq_file.h>
  11
  12 #define FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype)                \
  13 struct dbgfs_##name##_data {                                            \
  14         argtype *arg;                                                   \
  15         bool read_done;                                                 \
  16         ssize_t rlen;                                                   \
  17         char rbuf[buflen];                                              \
  18 };                                                                      \
  19 static int _iwl_dbgfs_##name##_open(struct inode *inode,                \
  20                                     struct file *file)                  \
  21 {                                                                       \
  22         struct dbgfs_##name##_data *data;                               \
  23                                                                         \
  24         data = kzalloc(sizeof(*data), GFP_KERNEL);                      \
  25         if (!data)                                                      \
  26                 return -ENOMEM;                                         \
  27                                                                         \
  28         data->read_done = false;                                        \
  29         data->arg = inode->i_private;                                   \
  30         file->private_data = data;                                      \
  31                                                                         \
  32         return 0;                                                       \
  33 }
  34
  35 #define FWRT_DEBUGFS_READ_WRAPPER(name)                                 \
  36 static ssize_t _iwl_dbgfs_##name##_read(struct file *file,              \
  37                                         char __user *user_buf,          \
  38                                         size_t count, loff_t *ppos)     \
  39 {                                                                       \
  40         struct dbgfs_##name##_data *data = file->private_data;          \
  41                                                                         \
  42         if (!data->read_done) {                                         \
  43                 data->read_done = true;                                 \
  44                 data->rlen = iwl_dbgfs_##name##_read(data->arg,         \
  45                                                      sizeof(data->rbuf),\
  46                                                      data->rbuf);       \
  47         }                                                               \
  48                                                                         \
  49         if (data->rlen < 0)                                             \
  50                 return data->rlen;                                      \
  51         return simple_read_from_buffer(user_buf, count, ppos,           \
  52                                        data->rbuf, data->rlen);         \
  53 }
  54
  55 static int _iwl_dbgfs_release(struct inode *inode, struct file *file)
  56 {
  57         kfree(file->private_data);
  58
  59         return 0;
  60 }
  61
  62 #define _FWRT_DEBUGFS_READ_FILE_OPS(name, buflen, argtype)              \
  63 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype)                        \
  64 FWRT_DEBUGFS_READ_WRAPPER(name)                                         \
  65 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
  66         .read = _iwl_dbgfs_##name##_read,                               \
  67         .open = _iwl_dbgfs_##name##_open,                               \
  68         .llseek = generic_file_llseek,                                  \
  69         .release = _iwl_dbgfs_release,                                  \
  70 }
  71
  72 #define FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype)               \
  73 static ssize_t _iwl_dbgfs_##name##_write(struct file *file,             \
  74                                          const char __user *user_buf,   \
  75                                          size_t count, loff_t *ppos)    \
  76 {                                                                       \
  77         argtype *arg =                                                  \
  78                 ((struct dbgfs_##name##_data *)file->private_data)->arg;\
  79         char buf[buflen] = {};                                          \
  80         size_t buf_size = min(count, sizeof(buf) -  1);                 \
  81                                                                         \
  82         if (copy_from_user(buf, user_buf, buf_size))                    \
  83                 return -EFAULT;                                         \
  84                                                                         \
  85         return iwl_dbgfs_##name##_write(arg, buf, buf_size);            \
  86 }
  87
  88 #define _FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, buflen, argtype)        \
  89 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype)                        \
  90 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype)                       \
  91 FWRT_DEBUGFS_READ_WRAPPER(name)                                         \
  92 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
  93         .write = _iwl_dbgfs_##name##_write,                             \
  94         .read = _iwl_dbgfs_##name##_read,                               \
  95         .open = _iwl_dbgfs_##name##_open,                               \
  96         .llseek = generic_file_llseek,                                  \
  97         .release = _iwl_dbgfs_release,                                  \
  98 }
  99
 100 #define _FWRT_DEBUGFS_WRITE_FILE_OPS(name, buflen, argtype)             \
 101 FWRT_DEBUGFS_OPEN_WRAPPER(name, buflen, argtype)                        \
 102 FWRT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype)                       \
 103 static const struct file_operations iwl_dbgfs_##name##_ops = {          \
 104         .write = _iwl_dbgfs_##name##_write,                             \
 105         .open = _iwl_dbgfs_##name##_open,                               \
 106         .llseek = generic_file_llseek,                                  \
 107         .release = _iwl_dbgfs_release,                                  \
 108 }
 109
 110 #define FWRT_DEBUGFS_READ_FILE_OPS(name, bufsz)                         \
 111         _FWRT_DEBUGFS_READ_FILE_OPS(name, bufsz, struct iwl_fw_runtime)
 112
 113 #define FWRT_DEBUGFS_WRITE_FILE_OPS(name, bufsz)                        \
 114         _FWRT_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct iwl_fw_runtime)
 115
 116 #define FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz)                   \
 117         _FWRT_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_fw_runtime)
 118
 119 #define FWRT_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode) do {     \
 120         debugfs_create_file(alias, mode, parent, fwrt,                  \
 121                             &iwl_dbgfs_##name##_ops);                   \
 122         } while (0)
 123 #define FWRT_DEBUGFS_ADD_FILE(name, parent, mode) \
 124         FWRT_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)
 125
 126 static int iwl_fw_send_timestamp_marker_cmd(struct iwl_fw_runtime *fwrt)
 127 {
 128         struct iwl_mvm_marker marker = {
 129                 .dw_len = sizeof(struct iwl_mvm_marker) / 4,
 130                 .marker_id = MARKER_ID_SYNC_CLOCK,
 131
 132                 /* the real timestamp is taken from the ftrace clock
 133                  * this is for finding the match between fw and kernel logs
 134                  */
 135                 .timestamp = cpu_to_le64(fwrt->timestamp.seq++),
 136         };
 137
 138         struct iwl_host_cmd hcmd = {
 139                 .id = MARKER_CMD,
 140                 .flags = CMD_ASYNC,
 141                 .data[0] = &marker,
 142                 .len[0] = sizeof(marker),
 143         };
 144
 145         return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 146 }
 147
 148 static int iwl_dbgfs_enabled_severities_write(struct iwl_fw_runtime *fwrt,
 149                                               char *buf, size_t count)
 150 {
 151         struct iwl_dbg_host_event_cfg_cmd event_cfg;
 152         struct iwl_host_cmd hcmd = {
 153                 .id = iwl_cmd_id(HOST_EVENT_CFG, DEBUG_GROUP, 0),
 154                 .flags = CMD_ASYNC,
 155                 .data[0] = &event_cfg,
 156                 .len[0] = sizeof(event_cfg),
 157         };
 158         u32 enabled_severities;
 159         int ret = kstrtou32(buf, 10, &enabled_severities);
 160
 161         if (ret < 0)
 162                 return ret;
 163
 164         event_cfg.enabled_severities = cpu_to_le32(enabled_severities);
 165
 166         ret = iwl_trans_send_cmd(fwrt->trans, &hcmd);
 167         IWL_INFO(fwrt,
 168                  "sent host event cfg with enabled_severities: %u, ret: %d\n",
 169                  enabled_severities, ret);
 170
 171         return ret ?: count;
 172 }
 173
 174 FWRT_DEBUGFS_WRITE_FILE_OPS(enabled_severities, 16);
 175
 176 static void iwl_fw_timestamp_marker_wk(struct work_struct *work)
 177 {
 178         int ret;
 179         struct iwl_fw_runtime *fwrt =
 180                 container_of(work, struct iwl_fw_runtime, timestamp.wk.work);
 181         unsigned long delay = fwrt->timestamp.delay;
 182
 183         ret = iwl_fw_send_timestamp_marker_cmd(fwrt);
 184         if (!ret && delay)
 185                 schedule_delayed_work(&fwrt->timestamp.wk,
 186                                       round_jiffies_relative(delay));
 187         else
 188                 IWL_INFO(fwrt,
 189                          "stopping timestamp_marker, ret: %d, delay: %u\n",
 190                          ret, jiffies_to_msecs(delay) / 1000);
 191 }
 192
 193 void iwl_fw_trigger_timestamp(struct iwl_fw_runtime *fwrt, u32 delay)
 194 {
 195         IWL_INFO(fwrt,
 196                  "starting timestamp_marker trigger with delay: %us\n",
 197                  delay);
 198
 199         iwl_fw_cancel_timestamp(fwrt);
 200
 201         fwrt->timestamp.delay = msecs_to_jiffies(delay * 1000);
 202
 203         schedule_delayed_work(&fwrt->timestamp.wk,
 204                               round_jiffies_relative(fwrt->timestamp.delay));
 205 }
 206
 207 static ssize_t iwl_dbgfs_timestamp_marker_write(struct iwl_fw_runtime *fwrt,
 208                                                 char *buf, size_t count)
 209 {
 210         int ret;
 211         u32 delay;
 212
 213         ret = kstrtou32(buf, 10, &delay);
 214         if (ret < 0)
 215                 return ret;
 216
 217         iwl_fw_trigger_timestamp(fwrt, delay);
 218
 219         return count;
 220 }
 221
 222 static ssize_t iwl_dbgfs_timestamp_marker_read(struct iwl_fw_runtime *fwrt,
 223                                                size_t size, char *buf)
 224 {
 225         u32 delay_secs = jiffies_to_msecs(fwrt->timestamp.delay) / 1000;
 226
 227         return scnprintf(buf, size, "%d\n", delay_secs);
 228 }
 229
 230 FWRT_DEBUGFS_READ_WRITE_FILE_OPS(timestamp_marker, 16);
 231
 232 struct hcmd_write_data {
 233         __be32 cmd_id;
 234         __be32 flags;
 235         __be16 length;
 236         u8 data[];
 237 } __packed;
 238
 239 static ssize_t iwl_dbgfs_send_hcmd_write(struct iwl_fw_runtime *fwrt, char *buf,
 240                                          size_t count)
 241 {
 242         size_t header_size = (sizeof(u32) * 2 + sizeof(u16)) * 2;
 243         size_t data_size = (count - 1) / 2;
 244         int ret;
 245         struct hcmd_write_data *data;
 246         struct iwl_host_cmd hcmd = {
 247                 .len = { 0, },
 248                 .data = { NULL, },
 249         };
 250
 251         if (fwrt->ops && fwrt->ops->fw_running &&
 252             !fwrt->ops->fw_running(fwrt->ops_ctx))
 253                 return -EIO;
 254
 255         if (count < header_size + 1 || count > 1024 * 4)
 256                 return -EINVAL;
 257
 258         data = kmalloc(data_size, GFP_KERNEL);
 259         if (!data)
 260                 return -ENOMEM;
 261
 262         ret = hex2bin((u8 *)data, buf, data_size);
 263         if (ret)
 264                 goto out;
 265
 266         hcmd.id = be32_to_cpu(data->cmd_id);
 267         hcmd.flags = be32_to_cpu(data->flags);
 268         hcmd.len[0] = be16_to_cpu(data->length);
 269         hcmd.data[0] = data->data;
 270
 271         if (count != header_size + hcmd.len[0] * 2 + 1) {
 272                 IWL_ERR(fwrt,
 273                         "host command data size does not match header length\n");
 274                 ret = -EINVAL;
 275                 goto out;
 276         }
 277
 278         if (fwrt->ops && fwrt->ops->send_hcmd)
 279                 ret = fwrt->ops->send_hcmd(fwrt->ops_ctx, &hcmd);
 280         else
 281                 ret = -EPERM;
 282
 283         if (ret < 0)
 284                 goto out;
 285
 286         if (hcmd.flags & CMD_WANT_SKB)
 287                 iwl_free_resp(&hcmd);
 288 out:
 289         kfree(data);
 290         return ret ?: count;
 291 }
 292
 293 FWRT_DEBUGFS_WRITE_FILE_OPS(send_hcmd, 512);
 294
 295 static ssize_t iwl_dbgfs_fw_dbg_domain_read(struct iwl_fw_runtime *fwrt,
 296                                             size_t size, char *buf)
 297 {
 298         return scnprintf(buf, size, "0x%08x\n",
 299                          fwrt->trans->dbg.domains_bitmap);
 300 }
 301
 302 FWRT_DEBUGFS_READ_FILE_OPS(fw_dbg_domain, 20);
 303
 304 struct iwl_dbgfs_fw_info_priv {
 305         struct iwl_fw_runtime *fwrt;
 306 };
 307
 308 struct iwl_dbgfs_fw_info_state {
 309         loff_t pos;
 310 };
 311
 312 static void *iwl_dbgfs_fw_info_seq_next(struct seq_file *seq,
 313                                         void *v, loff_t *pos)
 314 {
 315         struct iwl_dbgfs_fw_info_state *state = v;
 316         struct iwl_dbgfs_fw_info_priv *priv = seq->private;
 317         const struct iwl_fw *fw = priv->fwrt->fw;
 318
 319         *pos = ++state->pos;
 320         if (*pos >= fw->ucode_capa.n_cmd_versions)
 321                 return NULL;
 322
 323         return state;
 324 }
 325
 326 static void iwl_dbgfs_fw_info_seq_stop(struct seq_file *seq,
 327                                        void *v)
 328 {
 329         kfree(v);
 330 }
 331
 332 static void *iwl_dbgfs_fw_info_seq_start(struct seq_file *seq, loff_t *pos)
 333 {
 334         struct iwl_dbgfs_fw_info_priv *priv = seq->private;
 335         const struct iwl_fw *fw = priv->fwrt->fw;
 336         struct iwl_dbgfs_fw_info_state *state;
 337
 338         if (*pos >= fw->ucode_capa.n_cmd_versions)
 339                 return NULL;
 340
 341         state = kzalloc(sizeof(*state), GFP_KERNEL);
 342         if (!state)
 343                 return NULL;
 344         state->pos = *pos;
 345         return state;
 346 };
 347
 348 static int iwl_dbgfs_fw_info_seq_show(struct seq_file *seq, void *v)
 349 {
 350         struct iwl_dbgfs_fw_info_state *state = v;
 351         struct iwl_dbgfs_fw_info_priv *priv = seq->private;
 352         const struct iwl_fw *fw = priv->fwrt->fw;
 353         const struct iwl_fw_cmd_version *ver;
 354         u32 cmd_id;
 355
 356         if (!state->pos)
 357                 seq_puts(seq, "fw_api_ver:\n");
 358
 359         ver = &fw->ucode_capa.cmd_versions[state->pos];
 360
 361         cmd_id = iwl_cmd_id(ver->cmd, ver->group, 0);
 362
 363         seq_printf(seq, "  0x%04x:\n", cmd_id);
 364         seq_printf(seq, "    name: %s\n",
 365                    iwl_get_cmd_string(priv->fwrt->trans, cmd_id));
 366         seq_printf(seq, "    cmd_ver: %d\n", ver->cmd_ver);
 367         seq_printf(seq, "    notif_ver: %d\n", ver->notif_ver);
 368         return 0;
 369 }
 370
 371 static const struct seq_operations iwl_dbgfs_info_seq_ops = {
 372         .start = iwl_dbgfs_fw_info_seq_start,
 373         .next = iwl_dbgfs_fw_info_seq_next,
 374         .stop = iwl_dbgfs_fw_info_seq_stop,
 375         .show = iwl_dbgfs_fw_info_seq_show,
 376 };
 377
 378 static int iwl_dbgfs_fw_info_open(struct inode *inode, struct file *filp)
 379 {
 380         struct iwl_dbgfs_fw_info_priv *priv;
 381
 382         priv = __seq_open_private(filp, &iwl_dbgfs_info_seq_ops,
 383                                   sizeof(*priv));
 384
 385         if (!priv)
 386                 return -ENOMEM;
 387
 388         priv->fwrt = inode->i_private;
 389         return 0;
 390 }
 391
 392 static const struct file_operations iwl_dbgfs_fw_info_ops = {
 393         .owner = THIS_MODULE,
 394         .open = iwl_dbgfs_fw_info_open,
 395         .read = seq_read,
 396         .llseek = seq_lseek,
 397         .release = seq_release_private,
 398 };
 399
 400 void iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
 401                             struct dentry *dbgfs_dir)
 402 {
 403         INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
 404         FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
 405         FWRT_DEBUGFS_ADD_FILE(fw_info, dbgfs_dir, 0200);
 406         FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
 407         FWRT_DEBUGFS_ADD_FILE(enabled_severities, dbgfs_dir, 0200);
 408         FWRT_DEBUGFS_ADD_FILE(fw_dbg_domain, dbgfs_dir, 0400);
 409 }