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

   1 /******************************************************************************
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   8  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
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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 int iwl_mvm_temp_notif(struct iwl_mvm *mvm,
 154                        struct iwl_rx_cmd_buffer *rxb,
 155                        struct iwl_device_cmd *cmd)
 156 {
 157         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 158         int temp;
 159
 160         /* the notification is handled synchronously in ctkill, so skip here */
 161         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 162                 return 0;
 163
 164         temp = iwl_mvm_temp_notif_parse(mvm, pkt);
 165         if (temp < 0)
 166                 return 0;
 167
 168         iwl_mvm_tt_temp_changed(mvm, temp);
 169
 170         return 0;
 171 }
 172
 173 static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
 174 {
 175         struct iwl_dts_measurement_cmd cmd = {
 176                 .flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
 177         };
 178
 179         return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
 180                                     sizeof(cmd), &cmd);
 181 }
 182
 183 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 184 {
 185         struct iwl_notification_wait wait_temp_notif;
 186         static const u8 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
 187         int ret, temp;
 188
 189         lockdep_assert_held(&mvm->mutex);
 190
 191         iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 192                                    temp_notif, ARRAY_SIZE(temp_notif),
 193                                    iwl_mvm_temp_notif_wait, &temp);
 194
 195         ret = iwl_mvm_get_temp_cmd(mvm);
 196         if (ret) {
 197                 IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 198                 iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 199                 return ret;
 200         }
 201
 202         ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 203                                     IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 204         if (ret) {
 205                 IWL_ERR(mvm, "Getting the temperature timed out\n");
 206                 return ret;
 207         }
 208
 209         return temp;
 210 }
 211
 212 static void check_exit_ctkill(struct work_struct *work)
 213 {
 214         struct iwl_mvm_tt_mgmt *tt;
 215         struct iwl_mvm *mvm;
 216         u32 duration;
 217         s32 temp;
 218
 219         tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 220         mvm = container_of(tt, struct iwl_mvm, thermal_throttle);
 221
 222         duration = tt->params->ct_kill_duration;
 223
 224         mutex_lock(&mvm->mutex);
 225
 226         if (__iwl_mvm_mac_start(mvm))
 227                 goto reschedule;
 228
 229         /* make sure the device is available for direct read/writes */
 230         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 231                 __iwl_mvm_mac_stop(mvm);
 232                 goto reschedule;
 233         }
 234
 235         temp = iwl_mvm_get_temp(mvm);
 236
 237         iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);
 238
 239         __iwl_mvm_mac_stop(mvm);
 240
 241         if (temp < 0)
 242                 goto reschedule;
 243
 244         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);
 245
 246         if (temp <= tt->params->ct_kill_exit) {
 247                 mutex_unlock(&mvm->mutex);
 248                 iwl_mvm_exit_ctkill(mvm);
 249                 return;
 250         }
 251
 252 reschedule:
 253         mutex_unlock(&mvm->mutex);
 254         schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 255                               round_jiffies(duration * HZ));
 256 }
 257
 258 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 259                                      struct ieee80211_vif *vif)
 260 {
 261         struct iwl_mvm *mvm = _data;
 262         enum ieee80211_smps_mode smps_mode;
 263
 264         lockdep_assert_held(&mvm->mutex);
 265
 266         if (mvm->thermal_throttle.dynamic_smps)
 267                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 268         else
 269                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
 270
 271         if (vif->type != NL80211_IFTYPE_STATION)
 272                 return;
 273
 274         iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 275 }
 276
 277 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 278 {
 279         struct ieee80211_sta *sta;
 280         struct iwl_mvm_sta *mvmsta;
 281         int i, err;
 282
 283         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 284                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 285                                                 lockdep_is_held(&mvm->mutex));
 286                 if (IS_ERR_OR_NULL(sta))
 287                         continue;
 288                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 289                 if (enable == mvmsta->tt_tx_protection)
 290                         continue;
 291                 err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 292                 if (err) {
 293                         IWL_ERR(mvm, "Failed to %s Tx protection\n",
 294                                 enable ? "enable" : "disable");
 295                 } else {
 296                         IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 297                                        enable ? "Enable" : "Disable");
 298                         mvmsta->tt_tx_protection = enable;
 299                 }
 300         }
 301 }
 302
 303 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 304 {
 305         struct iwl_host_cmd cmd = {
 306                 .id = REPLY_THERMAL_MNG_BACKOFF,
 307                 .len = { sizeof(u32), },
 308                 .data = { &backoff, },
 309         };
 310
 311         backoff = max(backoff, mvm->thermal_throttle.min_backoff);
 312
 313         if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 314                 IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 315                                backoff);
 316                 mvm->thermal_throttle.tx_backoff = backoff;
 317         } else {
 318                 IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 319         }
 320 }
 321
 322 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 323 {
 324         const struct iwl_tt_params *params = mvm->thermal_throttle.params;
 325         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 326         s32 temperature = mvm->temperature;
 327         bool throttle_enable = false;
 328         int i;
 329         u32 tx_backoff;
 330
 331         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);
 332
 333         if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 334                 iwl_mvm_enter_ctkill(mvm);
 335                 return;
 336         }
 337
 338         if (params->support_ct_kill &&
 339             temperature <= tt->params->ct_kill_exit) {
 340                 iwl_mvm_exit_ctkill(mvm);
 341                 return;
 342         }
 343
 344         if (params->support_dynamic_smps) {
 345                 if (!tt->dynamic_smps &&
 346                     temperature >= params->dynamic_smps_entry) {
 347                         IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 348                         tt->dynamic_smps = true;
 349                         ieee80211_iterate_active_interfaces_atomic(
 350                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 351                                         iwl_mvm_tt_smps_iterator, mvm);
 352                         throttle_enable = true;
 353                 } else if (tt->dynamic_smps &&
 354                            temperature <= params->dynamic_smps_exit) {
 355                         IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 356                         tt->dynamic_smps = false;
 357                         ieee80211_iterate_active_interfaces_atomic(
 358                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 359                                         iwl_mvm_tt_smps_iterator, mvm);
 360                 }
 361         }
 362
 363         if (params->support_tx_protection) {
 364                 if (temperature >= params->tx_protection_entry) {
 365                         iwl_mvm_tt_tx_protection(mvm, true);
 366                         throttle_enable = true;
 367                 } else if (temperature <= params->tx_protection_exit) {
 368                         iwl_mvm_tt_tx_protection(mvm, false);
 369                 }
 370         }
 371
 372         if (params->support_tx_backoff) {
 373                 tx_backoff = tt->min_backoff;
 374                 for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 375                         if (temperature < params->tx_backoff[i].temperature)
 376                                 break;
 377                         tx_backoff = max(tt->min_backoff,
 378                                          params->tx_backoff[i].backoff);
 379                 }
 380                 if (tx_backoff != tt->min_backoff)
 381                         throttle_enable = true;
 382                 if (tt->tx_backoff != tx_backoff)
 383                         iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 384         }
 385
 386         if (!tt->throttle && throttle_enable) {
 387                 IWL_WARN(mvm,
 388                          "Due to high temperature thermal throttling initiated\n");
 389                 tt->throttle = true;
 390         } else if (tt->throttle && !tt->dynamic_smps &&
 391                    tt->tx_backoff == tt->min_backoff &&
 392                    temperature <= params->tx_protection_exit) {
 393                 IWL_WARN(mvm,
 394                          "Temperature is back to normal thermal throttling stopped\n");
 395                 tt->throttle = false;
 396         }
 397 }
 398
 399 static const struct iwl_tt_params iwl7000_tt_params = {
 400         .ct_kill_entry = 118,
 401         .ct_kill_exit = 96,
 402         .ct_kill_duration = 5,
 403         .dynamic_smps_entry = 114,
 404         .dynamic_smps_exit = 110,
 405         .tx_protection_entry = 114,
 406         .tx_protection_exit = 108,
 407         .tx_backoff = {
 408                 {.temperature = 112, .backoff = 200},
 409                 {.temperature = 113, .backoff = 600},
 410                 {.temperature = 114, .backoff = 1200},
 411                 {.temperature = 115, .backoff = 2000},
 412                 {.temperature = 116, .backoff = 4000},
 413                 {.temperature = 117, .backoff = 10000},
 414         },
 415         .support_ct_kill = true,
 416         .support_dynamic_smps = true,
 417         .support_tx_protection = true,
 418         .support_tx_backoff = true,
 419 };
 420
 421 static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
 422         .ct_kill_entry = 118,
 423         .ct_kill_exit = 96,
 424         .ct_kill_duration = 5,
 425         .dynamic_smps_entry = 114,
 426         .dynamic_smps_exit = 110,
 427         .tx_protection_entry = 114,
 428         .tx_protection_exit = 108,
 429         .tx_backoff = {
 430                 {.temperature = 112, .backoff = 300},
 431                 {.temperature = 113, .backoff = 800},
 432                 {.temperature = 114, .backoff = 1500},
 433                 {.temperature = 115, .backoff = 3000},
 434                 {.temperature = 116, .backoff = 5000},
 435                 {.temperature = 117, .backoff = 10000},
 436         },
 437         .support_ct_kill = true,
 438         .support_dynamic_smps = true,
 439         .support_tx_protection = true,
 440         .support_tx_backoff = true,
 441 };
 442
 443 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 444 {
 445         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 446
 447         IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");
 448
 449         if (mvm->cfg->high_temp)
 450                 tt->params = &iwl7000_high_temp_tt_params;
 451         else
 452                 tt->params = &iwl7000_tt_params;
 453
 454         tt->throttle = false;
 455         tt->min_backoff = min_backoff;
 456         INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 457 }
 458
 459 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 460 {
 461         cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 462         IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 463 }