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

   1 /******************************************************************************
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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         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
  73         u32 duration = mvm->thermal_throttle.params->ct_kill_duration;
  74
  75         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  76                 return;
  77
  78         IWL_ERR(mvm, "Enter CT Kill\n");
  79         iwl_mvm_set_hw_ctkill_state(mvm, true);
  80
  81         tt->throttle = false;
  82         tt->dynamic_smps = false;
  83
  84         /* Don't schedule an exit work if we're in test mode, since
  85          * the temperature will not change unless we manually set it
  86          * again (or disable testing).
  87          */
  88         if (!mvm->temperature_test)
  89                 schedule_delayed_work(&tt->ct_kill_exit,
  90                                       round_jiffies_relative(duration * HZ));
  91 }
  92
  93 static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
  94 {
  95         if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  96                 return;
  97
  98         IWL_ERR(mvm, "Exit CT Kill\n");
  99         iwl_mvm_set_hw_ctkill_state(mvm, false);
 100 }
 101
 102 void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
 103 {
 104         /* ignore the notification if we are in test mode */
 105         if (mvm->temperature_test)
 106                 return;
 107
 108         if (mvm->temperature == temp)
 109                 return;
 110
 111         mvm->temperature = temp;
 112         iwl_mvm_tt_handler(mvm);
 113 }
 114
 115 static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
 116                                     struct iwl_rx_packet *pkt)
 117 {
 118         struct iwl_dts_measurement_notif *notif;
 119         int len = iwl_rx_packet_payload_len(pkt);
 120         int temp;
 121
 122         if (WARN_ON_ONCE(len != sizeof(*notif))) {
 123                 IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
 124                 return -EINVAL;
 125         }
 126
 127         notif = (void *)pkt->data;
 128
 129         temp = le32_to_cpu(notif->temp);
 130
 131         /* shouldn't be negative, but since it's s32, make sure it isn't */
 132         if (WARN_ON_ONCE(temp < 0))
 133                 temp = 0;
 134
 135         IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);
 136
 137         return temp;
 138 }
 139
 140 static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
 141                                     struct iwl_rx_packet *pkt, void *data)
 142 {
 143         struct iwl_mvm *mvm =
 144                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 145         int *temp = data;
 146         int ret;
 147
 148         ret = iwl_mvm_temp_notif_parse(mvm, pkt);
 149         if (ret < 0)
 150                 return true;
 151
 152         *temp = ret;
 153
 154         return true;
 155 }
 156
 157 int iwl_mvm_temp_notif(struct iwl_mvm *mvm,
 158                        struct iwl_rx_cmd_buffer *rxb,
 159                        struct iwl_device_cmd *cmd)
 160 {
 161         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 162         int temp;
 163
 164         /* the notification is handled synchronously in ctkill, so skip here */
 165         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 166                 return 0;
 167
 168         temp = iwl_mvm_temp_notif_parse(mvm, pkt);
 169         if (temp < 0)
 170                 return 0;
 171
 172         iwl_mvm_tt_temp_changed(mvm, temp);
 173
 174         return 0;
 175 }
 176
 177 static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
 178 {
 179         struct iwl_dts_measurement_cmd cmd = {
 180                 .flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
 181         };
 182
 183         return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
 184                                     sizeof(cmd), &cmd);
 185 }
 186
 187 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 188 {
 189         struct iwl_notification_wait wait_temp_notif;
 190         static const u8 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
 191         int ret, temp;
 192
 193         lockdep_assert_held(&mvm->mutex);
 194
 195         iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 196                                    temp_notif, ARRAY_SIZE(temp_notif),
 197                                    iwl_mvm_temp_notif_wait, &temp);
 198
 199         ret = iwl_mvm_get_temp_cmd(mvm);
 200         if (ret) {
 201                 IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 202                 iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 203                 return ret;
 204         }
 205
 206         ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 207                                     IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 208         if (ret) {
 209                 IWL_ERR(mvm, "Getting the temperature timed out\n");
 210                 return ret;
 211         }
 212
 213         return temp;
 214 }
 215
 216 static void check_exit_ctkill(struct work_struct *work)
 217 {
 218         struct iwl_mvm_tt_mgmt *tt;
 219         struct iwl_mvm *mvm;
 220         u32 duration;
 221         s32 temp;
 222
 223         tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 224         mvm = container_of(tt, struct iwl_mvm, thermal_throttle);
 225
 226         duration = tt->params->ct_kill_duration;
 227
 228         mutex_lock(&mvm->mutex);
 229
 230         if (__iwl_mvm_mac_start(mvm))
 231                 goto reschedule;
 232
 233         /* make sure the device is available for direct read/writes */
 234         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 235                 __iwl_mvm_mac_stop(mvm);
 236                 goto reschedule;
 237         }
 238
 239         temp = iwl_mvm_get_temp(mvm);
 240
 241         iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);
 242
 243         __iwl_mvm_mac_stop(mvm);
 244
 245         if (temp < 0)
 246                 goto reschedule;
 247
 248         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);
 249
 250         if (temp <= tt->params->ct_kill_exit) {
 251                 mutex_unlock(&mvm->mutex);
 252                 iwl_mvm_exit_ctkill(mvm);
 253                 return;
 254         }
 255
 256 reschedule:
 257         mutex_unlock(&mvm->mutex);
 258         schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 259                               round_jiffies(duration * HZ));
 260 }
 261
 262 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 263                                      struct ieee80211_vif *vif)
 264 {
 265         struct iwl_mvm *mvm = _data;
 266         enum ieee80211_smps_mode smps_mode;
 267
 268         lockdep_assert_held(&mvm->mutex);
 269
 270         if (mvm->thermal_throttle.dynamic_smps)
 271                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 272         else
 273                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
 274
 275         if (vif->type != NL80211_IFTYPE_STATION)
 276                 return;
 277
 278         iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 279 }
 280
 281 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 282 {
 283         struct ieee80211_sta *sta;
 284         struct iwl_mvm_sta *mvmsta;
 285         int i, err;
 286
 287         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 288                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 289                                                 lockdep_is_held(&mvm->mutex));
 290                 if (IS_ERR_OR_NULL(sta))
 291                         continue;
 292                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 293                 if (enable == mvmsta->tt_tx_protection)
 294                         continue;
 295                 err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 296                 if (err) {
 297                         IWL_ERR(mvm, "Failed to %s Tx protection\n",
 298                                 enable ? "enable" : "disable");
 299                 } else {
 300                         IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 301                                        enable ? "Enable" : "Disable");
 302                         mvmsta->tt_tx_protection = enable;
 303                 }
 304         }
 305 }
 306
 307 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 308 {
 309         struct iwl_host_cmd cmd = {
 310                 .id = REPLY_THERMAL_MNG_BACKOFF,
 311                 .len = { sizeof(u32), },
 312                 .data = { &backoff, },
 313         };
 314
 315         backoff = max(backoff, mvm->thermal_throttle.min_backoff);
 316
 317         if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 318                 IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 319                                backoff);
 320                 mvm->thermal_throttle.tx_backoff = backoff;
 321         } else {
 322                 IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 323         }
 324 }
 325
 326 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 327 {
 328         const struct iwl_tt_params *params = mvm->thermal_throttle.params;
 329         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 330         s32 temperature = mvm->temperature;
 331         bool throttle_enable = false;
 332         int i;
 333         u32 tx_backoff;
 334
 335         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);
 336
 337         if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 338                 iwl_mvm_enter_ctkill(mvm);
 339                 return;
 340         }
 341
 342         if (params->support_ct_kill &&
 343             temperature <= tt->params->ct_kill_exit) {
 344                 iwl_mvm_exit_ctkill(mvm);
 345                 return;
 346         }
 347
 348         if (params->support_dynamic_smps) {
 349                 if (!tt->dynamic_smps &&
 350                     temperature >= params->dynamic_smps_entry) {
 351                         IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 352                         tt->dynamic_smps = true;
 353                         ieee80211_iterate_active_interfaces_atomic(
 354                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 355                                         iwl_mvm_tt_smps_iterator, mvm);
 356                         throttle_enable = true;
 357                 } else if (tt->dynamic_smps &&
 358                            temperature <= params->dynamic_smps_exit) {
 359                         IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 360                         tt->dynamic_smps = false;
 361                         ieee80211_iterate_active_interfaces_atomic(
 362                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 363                                         iwl_mvm_tt_smps_iterator, mvm);
 364                 }
 365         }
 366
 367         if (params->support_tx_protection) {
 368                 if (temperature >= params->tx_protection_entry) {
 369                         iwl_mvm_tt_tx_protection(mvm, true);
 370                         throttle_enable = true;
 371                 } else if (temperature <= params->tx_protection_exit) {
 372                         iwl_mvm_tt_tx_protection(mvm, false);
 373                 }
 374         }
 375
 376         if (params->support_tx_backoff) {
 377                 tx_backoff = tt->min_backoff;
 378                 for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 379                         if (temperature < params->tx_backoff[i].temperature)
 380                                 break;
 381                         tx_backoff = max(tt->min_backoff,
 382                                          params->tx_backoff[i].backoff);
 383                 }
 384                 if (tx_backoff != tt->min_backoff)
 385                         throttle_enable = true;
 386                 if (tt->tx_backoff != tx_backoff)
 387                         iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 388         }
 389
 390         if (!tt->throttle && throttle_enable) {
 391                 IWL_WARN(mvm,
 392                          "Due to high temperature thermal throttling initiated\n");
 393                 tt->throttle = true;
 394         } else if (tt->throttle && !tt->dynamic_smps &&
 395                    tt->tx_backoff == tt->min_backoff &&
 396                    temperature <= params->tx_protection_exit) {
 397                 IWL_WARN(mvm,
 398                          "Temperature is back to normal thermal throttling stopped\n");
 399                 tt->throttle = false;
 400         }
 401 }
 402
 403 static const struct iwl_tt_params iwl7000_tt_params = {
 404         .ct_kill_entry = 118,
 405         .ct_kill_exit = 96,
 406         .ct_kill_duration = 5,
 407         .dynamic_smps_entry = 114,
 408         .dynamic_smps_exit = 110,
 409         .tx_protection_entry = 114,
 410         .tx_protection_exit = 108,
 411         .tx_backoff = {
 412                 {.temperature = 112, .backoff = 200},
 413                 {.temperature = 113, .backoff = 600},
 414                 {.temperature = 114, .backoff = 1200},
 415                 {.temperature = 115, .backoff = 2000},
 416                 {.temperature = 116, .backoff = 4000},
 417                 {.temperature = 117, .backoff = 10000},
 418         },
 419         .support_ct_kill = true,
 420         .support_dynamic_smps = true,
 421         .support_tx_protection = true,
 422         .support_tx_backoff = true,
 423 };
 424
 425 static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
 426         .ct_kill_entry = 118,
 427         .ct_kill_exit = 96,
 428         .ct_kill_duration = 5,
 429         .dynamic_smps_entry = 114,
 430         .dynamic_smps_exit = 110,
 431         .tx_protection_entry = 114,
 432         .tx_protection_exit = 108,
 433         .tx_backoff = {
 434                 {.temperature = 112, .backoff = 300},
 435                 {.temperature = 113, .backoff = 800},
 436                 {.temperature = 114, .backoff = 1500},
 437                 {.temperature = 115, .backoff = 3000},
 438                 {.temperature = 116, .backoff = 5000},
 439                 {.temperature = 117, .backoff = 10000},
 440         },
 441         .support_ct_kill = true,
 442         .support_dynamic_smps = true,
 443         .support_tx_protection = true,
 444         .support_tx_backoff = true,
 445 };
 446
 447 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 448 {
 449         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 450
 451         IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");
 452
 453         if (mvm->cfg->high_temp)
 454                 tt->params = &iwl7000_high_temp_tt_params;
 455         else
 456                 tt->params = &iwl7000_tt_params;
 457
 458         tt->throttle = false;
 459         tt->dynamic_smps = false;
 460         tt->min_backoff = min_backoff;
 461         INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 462 }
 463
 464 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 465 {
 466         cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 467         IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 468 }