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

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  65  *****************************************************************************/
  66
  67 #include "mvm.h"
  68
  69 #define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT HZ
  70
  71 static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
  72 {
  73         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
  74         u32 duration = tt->params.ct_kill_duration;
  75
  76         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  77                 return;
  78
  79         IWL_ERR(mvm, "Enter CT Kill\n");
  80         iwl_mvm_set_hw_ctkill_state(mvm, true);
  81
  82         tt->throttle = false;
  83         tt->dynamic_smps = false;
  84
  85         /* Don't schedule an exit work if we're in test mode, since
  86          * the temperature will not change unless we manually set it
  87          * again (or disable testing).
  88          */
  89         if (!mvm->temperature_test)
  90                 schedule_delayed_work(&tt->ct_kill_exit,
  91                                       round_jiffies_relative(duration * HZ));
  92 }
  93
  94 static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
  95 {
  96         if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
  97                 return;
  98
  99         IWL_ERR(mvm, "Exit CT Kill\n");
 100         iwl_mvm_set_hw_ctkill_state(mvm, false);
 101 }
 102
 103 void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
 104 {
 105         /* ignore the notification if we are in test mode */
 106         if (mvm->temperature_test)
 107                 return;
 108
 109         if (mvm->temperature == temp)
 110                 return;
 111
 112         mvm->temperature = temp;
 113         iwl_mvm_tt_handler(mvm);
 114 }
 115
 116 static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
 117                                     struct iwl_rx_packet *pkt)
 118 {
 119         struct iwl_dts_measurement_notif *notif;
 120         int len = iwl_rx_packet_payload_len(pkt);
 121         int temp;
 122
 123         if (WARN_ON_ONCE(len != sizeof(*notif))) {
 124                 IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
 125                 return -EINVAL;
 126         }
 127
 128         notif = (void *)pkt->data;
 129
 130         temp = le32_to_cpu(notif->temp);
 131
 132         /* shouldn't be negative, but since it's s32, make sure it isn't */
 133         if (WARN_ON_ONCE(temp < 0))
 134                 temp = 0;
 135
 136         IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);
 137
 138         return temp;
 139 }
 140
 141 static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
 142                                     struct iwl_rx_packet *pkt, void *data)
 143 {
 144         struct iwl_mvm *mvm =
 145                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 146         int *temp = data;
 147         int ret;
 148
 149         ret = iwl_mvm_temp_notif_parse(mvm, pkt);
 150         if (ret < 0)
 151                 return true;
 152
 153         *temp = ret;
 154
 155         return true;
 156 }
 157
 158 void iwl_mvm_temp_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb)
 159 {
 160         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 161         int temp;
 162
 163         /* the notification is handled synchronously in ctkill, so skip here */
 164         if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 165                 return;
 166
 167         temp = iwl_mvm_temp_notif_parse(mvm, pkt);
 168         if (temp < 0)
 169                 return;
 170
 171         iwl_mvm_tt_temp_changed(mvm, temp);
 172 }
 173
 174 static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
 175 {
 176         struct iwl_dts_measurement_cmd cmd = {
 177                 .flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
 178         };
 179         u32 cmdid;
 180
 181         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_WIDE_CMD_HDR))
 182                 cmdid = iwl_cmd_id(CMD_DTS_MEASUREMENT_TRIGGER_WIDE,
 183                                    PHY_OPS_GROUP, 0);
 184         else
 185                 cmdid = CMD_DTS_MEASUREMENT_TRIGGER;
 186         return iwl_mvm_send_cmd_pdu(mvm, cmdid, 0,
 187                                     sizeof(cmd), &cmd);
 188 }
 189
 190 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 191 {
 192         struct iwl_notification_wait wait_temp_notif;
 193         static u16 temp_notif[] = { WIDE_ID(PHY_OPS_GROUP,
 194                                             DTS_MEASUREMENT_NOTIF_WIDE) };
 195         int ret, temp;
 196
 197         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_WIDE_CMD_HDR))
 198                 temp_notif[0] = DTS_MEASUREMENT_NOTIFICATION;
 199
 200         lockdep_assert_held(&mvm->mutex);
 201
 202         iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 203                                    temp_notif, ARRAY_SIZE(temp_notif),
 204                                    iwl_mvm_temp_notif_wait, &temp);
 205
 206         ret = iwl_mvm_get_temp_cmd(mvm);
 207         if (ret) {
 208                 IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 209                 iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 210                 return ret;
 211         }
 212
 213         ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 214                                     IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 215         if (ret) {
 216                 IWL_ERR(mvm, "Getting the temperature timed out\n");
 217                 return ret;
 218         }
 219
 220         return temp;
 221 }
 222
 223 static void check_exit_ctkill(struct work_struct *work)
 224 {
 225         struct iwl_mvm_tt_mgmt *tt;
 226         struct iwl_mvm *mvm;
 227         u32 duration;
 228         s32 temp;
 229
 230         tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 231         mvm = container_of(tt, struct iwl_mvm, thermal_throttle);
 232
 233         duration = tt->params.ct_kill_duration;
 234
 235         mutex_lock(&mvm->mutex);
 236
 237         if (__iwl_mvm_mac_start(mvm))
 238                 goto reschedule;
 239
 240         /* make sure the device is available for direct read/writes */
 241         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 242                 __iwl_mvm_mac_stop(mvm);
 243                 goto reschedule;
 244         }
 245
 246         temp = iwl_mvm_get_temp(mvm);
 247
 248         iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);
 249
 250         __iwl_mvm_mac_stop(mvm);
 251
 252         if (temp < 0)
 253                 goto reschedule;
 254
 255         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);
 256
 257         if (temp <= tt->params.ct_kill_exit) {
 258                 mutex_unlock(&mvm->mutex);
 259                 iwl_mvm_exit_ctkill(mvm);
 260                 return;
 261         }
 262
 263 reschedule:
 264         mutex_unlock(&mvm->mutex);
 265         schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 266                               round_jiffies(duration * HZ));
 267 }
 268
 269 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 270                                      struct ieee80211_vif *vif)
 271 {
 272         struct iwl_mvm *mvm = _data;
 273         enum ieee80211_smps_mode smps_mode;
 274
 275         lockdep_assert_held(&mvm->mutex);
 276
 277         if (mvm->thermal_throttle.dynamic_smps)
 278                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 279         else
 280                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
 281
 282         if (vif->type != NL80211_IFTYPE_STATION)
 283                 return;
 284
 285         iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 286 }
 287
 288 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 289 {
 290         struct ieee80211_sta *sta;
 291         struct iwl_mvm_sta *mvmsta;
 292         int i, err;
 293
 294         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 295                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 296                                                 lockdep_is_held(&mvm->mutex));
 297                 if (IS_ERR_OR_NULL(sta))
 298                         continue;
 299                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 300                 if (enable == mvmsta->tt_tx_protection)
 301                         continue;
 302                 err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 303                 if (err) {
 304                         IWL_ERR(mvm, "Failed to %s Tx protection\n",
 305                                 enable ? "enable" : "disable");
 306                 } else {
 307                         IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 308                                        enable ? "Enable" : "Disable");
 309                         mvmsta->tt_tx_protection = enable;
 310                 }
 311         }
 312 }
 313
 314 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 315 {
 316         struct iwl_host_cmd cmd = {
 317                 .id = REPLY_THERMAL_MNG_BACKOFF,
 318                 .len = { sizeof(u32), },
 319                 .data = { &backoff, },
 320         };
 321
 322         backoff = max(backoff, mvm->thermal_throttle.min_backoff);
 323
 324         if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 325                 IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 326                                backoff);
 327                 mvm->thermal_throttle.tx_backoff = backoff;
 328         } else {
 329                 IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 330         }
 331 }
 332
 333 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 334 {
 335         struct iwl_tt_params *params = &mvm->thermal_throttle.params;
 336         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 337         s32 temperature = mvm->temperature;
 338         bool throttle_enable = false;
 339         int i;
 340         u32 tx_backoff;
 341
 342         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);
 343
 344         if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 345                 iwl_mvm_enter_ctkill(mvm);
 346                 return;
 347         }
 348
 349         if (params->support_ct_kill &&
 350             temperature <= params->ct_kill_exit) {
 351                 iwl_mvm_exit_ctkill(mvm);
 352                 return;
 353         }
 354
 355         if (params->support_dynamic_smps) {
 356                 if (!tt->dynamic_smps &&
 357                     temperature >= params->dynamic_smps_entry) {
 358                         IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 359                         tt->dynamic_smps = true;
 360                         ieee80211_iterate_active_interfaces_atomic(
 361                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 362                                         iwl_mvm_tt_smps_iterator, mvm);
 363                         throttle_enable = true;
 364                 } else if (tt->dynamic_smps &&
 365                            temperature <= params->dynamic_smps_exit) {
 366                         IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 367                         tt->dynamic_smps = false;
 368                         ieee80211_iterate_active_interfaces_atomic(
 369                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 370                                         iwl_mvm_tt_smps_iterator, mvm);
 371                 }
 372         }
 373
 374         if (params->support_tx_protection) {
 375                 if (temperature >= params->tx_protection_entry) {
 376                         iwl_mvm_tt_tx_protection(mvm, true);
 377                         throttle_enable = true;
 378                 } else if (temperature <= params->tx_protection_exit) {
 379                         iwl_mvm_tt_tx_protection(mvm, false);
 380                 }
 381         }
 382
 383         if (params->support_tx_backoff) {
 384                 tx_backoff = tt->min_backoff;
 385                 for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 386                         if (temperature < params->tx_backoff[i].temperature)
 387                                 break;
 388                         tx_backoff = max(tt->min_backoff,
 389                                          params->tx_backoff[i].backoff);
 390                 }
 391                 if (tx_backoff != tt->min_backoff)
 392                         throttle_enable = true;
 393                 if (tt->tx_backoff != tx_backoff)
 394                         iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 395         }
 396
 397         if (!tt->throttle && throttle_enable) {
 398                 IWL_WARN(mvm,
 399                          "Due to high temperature thermal throttling initiated\n");
 400                 tt->throttle = true;
 401         } else if (tt->throttle && !tt->dynamic_smps &&
 402                    tt->tx_backoff == tt->min_backoff &&
 403                    temperature <= params->tx_protection_exit) {
 404                 IWL_WARN(mvm,
 405                          "Temperature is back to normal thermal throttling stopped\n");
 406                 tt->throttle = false;
 407         }
 408 }
 409
 410 static const struct iwl_tt_params iwl_mvm_default_tt_params = {
 411         .ct_kill_entry = 118,
 412         .ct_kill_exit = 96,
 413         .ct_kill_duration = 5,
 414         .dynamic_smps_entry = 114,
 415         .dynamic_smps_exit = 110,
 416         .tx_protection_entry = 114,
 417         .tx_protection_exit = 108,
 418         .tx_backoff = {
 419                 {.temperature = 112, .backoff = 200},
 420                 {.temperature = 113, .backoff = 600},
 421                 {.temperature = 114, .backoff = 1200},
 422                 {.temperature = 115, .backoff = 2000},
 423                 {.temperature = 116, .backoff = 4000},
 424                 {.temperature = 117, .backoff = 10000},
 425         },
 426         .support_ct_kill = true,
 427         .support_dynamic_smps = true,
 428         .support_tx_protection = true,
 429         .support_tx_backoff = true,
 430 };
 431
 432 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 433 {
 434         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 435
 436         IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");
 437
 438         if (mvm->cfg->thermal_params)
 439                 tt->params = *mvm->cfg->thermal_params;
 440         else
 441                 tt->params = iwl_mvm_default_tt_params;
 442
 443         tt->throttle = false;
 444         tt->dynamic_smps = false;
 445         tt->min_backoff = min_backoff;
 446         INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 447 }
 448
 449 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 450 {
 451         cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 452         IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 453 }