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

   1 /******************************************************************************
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   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
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  18  * General Public License for more details.
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  24  *
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  26  * in the file called COPYING.
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  29  *  Intel Linux Wireless <ilw@linux.intel.com>
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  31  *
  32  * BSD LICENSE
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  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  64  *****************************************************************************/
  65
  66 #include "mvm.h"
  67
  68 #define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT HZ
  69
  70 static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
  71 {
  72         u32 duration = mvm->thermal_throttle.params->ct_kill_duration;
  73
  74         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  75                 return;
  76
  77         IWL_ERR(mvm, "Enter CT Kill\n");
  78         iwl_mvm_set_hw_ctkill_state(mvm, true);
  79
  80         /* Don't schedule an exit work if we're in test mode, since
  81          * the temperature will not change unless we manually set it
  82          * again (or disable testing).
  83          */
  84         if (!mvm->temperature_test)
  85                 schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
  86                                       round_jiffies_relative(duration * HZ));
  87 }
  88
  89 static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
  90 {
  91         if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  92                 return;
  93
  94         IWL_ERR(mvm, "Exit CT Kill\n");
  95         iwl_mvm_set_hw_ctkill_state(mvm, false);
  96 }
  97
  98 void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
  99 {
 100         /* ignore the notification if we are in test mode */
 101         if (mvm->temperature_test)
 102                 return;
 103
 104         if (mvm->temperature == temp)
 105                 return;
 106
 107         mvm->temperature = temp;
 108         iwl_mvm_tt_handler(mvm);
 109 }
 110
 111 static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
 112                                     struct iwl_rx_packet *pkt)
 113 {
 114         struct iwl_dts_measurement_notif *notif;
 115         int len = iwl_rx_packet_payload_len(pkt);
 116         int temp;
 117
 118         if (WARN_ON_ONCE(len != sizeof(*notif))) {
 119                 IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
 120                 return -EINVAL;
 121         }
 122
 123         notif = (void *)pkt->data;
 124
 125         temp = le32_to_cpu(notif->temp);
 126
 127         /* shouldn't be negative, but since it's s32, make sure it isn't */
 128         if (WARN_ON_ONCE(temp < 0))
 129                 temp = 0;
 130
 131         IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);
 132
 133         return temp;
 134 }
 135
 136 static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
 137                                     struct iwl_rx_packet *pkt, void *data)
 138 {
 139         struct iwl_mvm *mvm =
 140                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 141         int *temp = data;
 142         int ret;
 143
 144         ret = iwl_mvm_temp_notif_parse(mvm, pkt);
 145         if (ret < 0)
 146                 return true;
 147
 148         *temp = ret;
 149
 150         return true;
 151 }
 152
 153 static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
 154 {
 155         struct iwl_dts_measurement_cmd cmd = {
 156                 .flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
 157         };
 158
 159         return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
 160                                     sizeof(cmd), &cmd);
 161 }
 162
 163 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 164 {
 165         struct iwl_notification_wait wait_temp_notif;
 166         static const u8 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
 167         int ret, temp;
 168
 169         lockdep_assert_held(&mvm->mutex);
 170
 171         iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 172                                    temp_notif, ARRAY_SIZE(temp_notif),
 173                                    iwl_mvm_temp_notif_wait, &temp);
 174
 175         ret = iwl_mvm_get_temp_cmd(mvm);
 176         if (ret) {
 177                 IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 178                 iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 179                 return ret;
 180         }
 181
 182         ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 183                                     IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 184         if (ret) {
 185                 IWL_ERR(mvm, "Getting the temperature timed out\n");
 186                 return ret;
 187         }
 188
 189         return temp;
 190 }
 191
 192 static void check_exit_ctkill(struct work_struct *work)
 193 {
 194         struct iwl_mvm_tt_mgmt *tt;
 195         struct iwl_mvm *mvm;
 196         u32 duration;
 197         s32 temp;
 198
 199         tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 200         mvm = container_of(tt, struct iwl_mvm, thermal_throttle);
 201
 202         duration = tt->params->ct_kill_duration;
 203
 204         mutex_lock(&mvm->mutex);
 205
 206         if (__iwl_mvm_mac_start(mvm))
 207                 goto reschedule;
 208
 209         /* make sure the device is available for direct read/writes */
 210         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 211                 __iwl_mvm_mac_stop(mvm);
 212                 goto reschedule;
 213         }
 214
 215         temp = iwl_mvm_get_temp(mvm);
 216
 217         iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);
 218
 219         __iwl_mvm_mac_stop(mvm);
 220
 221         if (temp < 0)
 222                 goto reschedule;
 223
 224         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);
 225
 226         if (temp <= tt->params->ct_kill_exit) {
 227                 mutex_unlock(&mvm->mutex);
 228                 iwl_mvm_exit_ctkill(mvm);
 229                 return;
 230         }
 231
 232 reschedule:
 233         mutex_unlock(&mvm->mutex);
 234         schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 235                               round_jiffies(duration * HZ));
 236 }
 237
 238 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 239                                      struct ieee80211_vif *vif)
 240 {
 241         struct iwl_mvm *mvm = _data;
 242         enum ieee80211_smps_mode smps_mode;
 243
 244         lockdep_assert_held(&mvm->mutex);
 245
 246         if (mvm->thermal_throttle.dynamic_smps)
 247                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 248         else
 249                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
 250
 251         if (vif->type != NL80211_IFTYPE_STATION)
 252                 return;
 253
 254         iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 255 }
 256
 257 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 258 {
 259         struct ieee80211_sta *sta;
 260         struct iwl_mvm_sta *mvmsta;
 261         int i, err;
 262
 263         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 264                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 265                                                 lockdep_is_held(&mvm->mutex));
 266                 if (IS_ERR_OR_NULL(sta))
 267                         continue;
 268                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 269                 if (enable == mvmsta->tt_tx_protection)
 270                         continue;
 271                 err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 272                 if (err) {
 273                         IWL_ERR(mvm, "Failed to %s Tx protection\n",
 274                                 enable ? "enable" : "disable");
 275                 } else {
 276                         IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 277                                        enable ? "Enable" : "Disable");
 278                         mvmsta->tt_tx_protection = enable;
 279                 }
 280         }
 281 }
 282
 283 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 284 {
 285         struct iwl_host_cmd cmd = {
 286                 .id = REPLY_THERMAL_MNG_BACKOFF,
 287                 .len = { sizeof(u32), },
 288                 .data = { &backoff, },
 289         };
 290
 291         backoff = max(backoff, mvm->thermal_throttle.min_backoff);
 292
 293         if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 294                 IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 295                                backoff);
 296                 mvm->thermal_throttle.tx_backoff = backoff;
 297         } else {
 298                 IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 299         }
 300 }
 301
 302 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 303 {
 304         const struct iwl_tt_params *params = mvm->thermal_throttle.params;
 305         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 306         s32 temperature = mvm->temperature;
 307         bool throttle_enable = false;
 308         int i;
 309         u32 tx_backoff;
 310
 311         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);
 312
 313         if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 314                 iwl_mvm_enter_ctkill(mvm);
 315                 return;
 316         }
 317
 318         if (params->support_ct_kill &&
 319             temperature <= tt->params->ct_kill_exit) {
 320                 iwl_mvm_exit_ctkill(mvm);
 321                 return;
 322         }
 323
 324         if (params->support_dynamic_smps) {
 325                 if (!tt->dynamic_smps &&
 326                     temperature >= params->dynamic_smps_entry) {
 327                         IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 328                         tt->dynamic_smps = true;
 329                         ieee80211_iterate_active_interfaces_atomic(
 330                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 331                                         iwl_mvm_tt_smps_iterator, mvm);
 332                         throttle_enable = true;
 333                 } else if (tt->dynamic_smps &&
 334                            temperature <= params->dynamic_smps_exit) {
 335                         IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 336                         tt->dynamic_smps = false;
 337                         ieee80211_iterate_active_interfaces_atomic(
 338                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 339                                         iwl_mvm_tt_smps_iterator, mvm);
 340                 }
 341         }
 342
 343         if (params->support_tx_protection) {
 344                 if (temperature >= params->tx_protection_entry) {
 345                         iwl_mvm_tt_tx_protection(mvm, true);
 346                         throttle_enable = true;
 347                 } else if (temperature <= params->tx_protection_exit) {
 348                         iwl_mvm_tt_tx_protection(mvm, false);
 349                 }
 350         }
 351
 352         if (params->support_tx_backoff) {
 353                 tx_backoff = tt->min_backoff;
 354                 for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 355                         if (temperature < params->tx_backoff[i].temperature)
 356                                 break;
 357                         tx_backoff = max(tt->min_backoff,
 358                                          params->tx_backoff[i].backoff);
 359                 }
 360                 if (tx_backoff != tt->min_backoff)
 361                         throttle_enable = true;
 362                 if (tt->tx_backoff != tx_backoff)
 363                         iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 364         }
 365
 366         if (!tt->throttle && throttle_enable) {
 367                 IWL_WARN(mvm,
 368                          "Due to high temperature thermal throttling initiated\n");
 369                 tt->throttle = true;
 370         } else if (tt->throttle && !tt->dynamic_smps &&
 371                    tt->tx_backoff == tt->min_backoff &&
 372                    temperature <= params->tx_protection_exit) {
 373                 IWL_WARN(mvm,
 374                          "Temperature is back to normal thermal throttling stopped\n");
 375                 tt->throttle = false;
 376         }
 377 }
 378
 379 static const struct iwl_tt_params iwl7000_tt_params = {
 380         .ct_kill_entry = 118,
 381         .ct_kill_exit = 96,
 382         .ct_kill_duration = 5,
 383         .dynamic_smps_entry = 114,
 384         .dynamic_smps_exit = 110,
 385         .tx_protection_entry = 114,
 386         .tx_protection_exit = 108,
 387         .tx_backoff = {
 388                 {.temperature = 112, .backoff = 200},
 389                 {.temperature = 113, .backoff = 600},
 390                 {.temperature = 114, .backoff = 1200},
 391                 {.temperature = 115, .backoff = 2000},
 392                 {.temperature = 116, .backoff = 4000},
 393                 {.temperature = 117, .backoff = 10000},
 394         },
 395         .support_ct_kill = true,
 396         .support_dynamic_smps = true,
 397         .support_tx_protection = true,
 398         .support_tx_backoff = true,
 399 };
 400
 401 static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
 402         .ct_kill_entry = 118,
 403         .ct_kill_exit = 96,
 404         .ct_kill_duration = 5,
 405         .dynamic_smps_entry = 114,
 406         .dynamic_smps_exit = 110,
 407         .tx_protection_entry = 114,
 408         .tx_protection_exit = 108,
 409         .tx_backoff = {
 410                 {.temperature = 112, .backoff = 300},
 411                 {.temperature = 113, .backoff = 800},
 412                 {.temperature = 114, .backoff = 1500},
 413                 {.temperature = 115, .backoff = 3000},
 414                 {.temperature = 116, .backoff = 5000},
 415                 {.temperature = 117, .backoff = 10000},
 416         },
 417         .support_ct_kill = true,
 418         .support_dynamic_smps = true,
 419         .support_tx_protection = true,
 420         .support_tx_backoff = true,
 421 };
 422
 423 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 424 {
 425         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 426
 427         IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");
 428
 429         if (mvm->cfg->high_temp)
 430                 tt->params = &iwl7000_high_temp_tt_params;
 431         else
 432                 tt->params = &iwl7000_tt_params;
 433
 434         tt->throttle = false;
 435         tt->min_backoff = min_backoff;
 436         INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 437 }
 438
 439 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 440 {
 441         cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 442         IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 443 }