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

   1 /******************************************************************************
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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
 180         return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
 181                                     sizeof(cmd), &cmd);
 182 }
 183
 184 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 185 {
 186         struct iwl_notification_wait wait_temp_notif;
 187         static const u16 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
 188         int ret, temp;
 189
 190         lockdep_assert_held(&mvm->mutex);
 191
 192         iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 193                                    temp_notif, ARRAY_SIZE(temp_notif),
 194                                    iwl_mvm_temp_notif_wait, &temp);
 195
 196         ret = iwl_mvm_get_temp_cmd(mvm);
 197         if (ret) {
 198                 IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 199                 iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 200                 return ret;
 201         }
 202
 203         ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 204                                     IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 205         if (ret) {
 206                 IWL_ERR(mvm, "Getting the temperature timed out\n");
 207                 return ret;
 208         }
 209
 210         return temp;
 211 }
 212
 213 static void check_exit_ctkill(struct work_struct *work)
 214 {
 215         struct iwl_mvm_tt_mgmt *tt;
 216         struct iwl_mvm *mvm;
 217         u32 duration;
 218         s32 temp;
 219
 220         tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 221         mvm = container_of(tt, struct iwl_mvm, thermal_throttle);
 222
 223         duration = tt->params.ct_kill_duration;
 224
 225         mutex_lock(&mvm->mutex);
 226
 227         if (__iwl_mvm_mac_start(mvm))
 228                 goto reschedule;
 229
 230         /* make sure the device is available for direct read/writes */
 231         if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 232                 __iwl_mvm_mac_stop(mvm);
 233                 goto reschedule;
 234         }
 235
 236         temp = iwl_mvm_get_temp(mvm);
 237
 238         iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);
 239
 240         __iwl_mvm_mac_stop(mvm);
 241
 242         if (temp < 0)
 243                 goto reschedule;
 244
 245         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);
 246
 247         if (temp <= tt->params.ct_kill_exit) {
 248                 mutex_unlock(&mvm->mutex);
 249                 iwl_mvm_exit_ctkill(mvm);
 250                 return;
 251         }
 252
 253 reschedule:
 254         mutex_unlock(&mvm->mutex);
 255         schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 256                               round_jiffies(duration * HZ));
 257 }
 258
 259 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 260                                      struct ieee80211_vif *vif)
 261 {
 262         struct iwl_mvm *mvm = _data;
 263         enum ieee80211_smps_mode smps_mode;
 264
 265         lockdep_assert_held(&mvm->mutex);
 266
 267         if (mvm->thermal_throttle.dynamic_smps)
 268                 smps_mode = IEEE80211_SMPS_DYNAMIC;
 269         else
 270                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
 271
 272         if (vif->type != NL80211_IFTYPE_STATION)
 273                 return;
 274
 275         iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 276 }
 277
 278 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 279 {
 280         struct ieee80211_sta *sta;
 281         struct iwl_mvm_sta *mvmsta;
 282         int i, err;
 283
 284         for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 285                 sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 286                                                 lockdep_is_held(&mvm->mutex));
 287                 if (IS_ERR_OR_NULL(sta))
 288                         continue;
 289                 mvmsta = iwl_mvm_sta_from_mac80211(sta);
 290                 if (enable == mvmsta->tt_tx_protection)
 291                         continue;
 292                 err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 293                 if (err) {
 294                         IWL_ERR(mvm, "Failed to %s Tx protection\n",
 295                                 enable ? "enable" : "disable");
 296                 } else {
 297                         IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 298                                        enable ? "Enable" : "Disable");
 299                         mvmsta->tt_tx_protection = enable;
 300                 }
 301         }
 302 }
 303
 304 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 305 {
 306         struct iwl_host_cmd cmd = {
 307                 .id = REPLY_THERMAL_MNG_BACKOFF,
 308                 .len = { sizeof(u32), },
 309                 .data = { &backoff, },
 310         };
 311
 312         backoff = max(backoff, mvm->thermal_throttle.min_backoff);
 313
 314         if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 315                 IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 316                                backoff);
 317                 mvm->thermal_throttle.tx_backoff = backoff;
 318         } else {
 319                 IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 320         }
 321 }
 322
 323 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 324 {
 325         struct iwl_tt_params *params = &mvm->thermal_throttle.params;
 326         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 327         s32 temperature = mvm->temperature;
 328         bool throttle_enable = false;
 329         int i;
 330         u32 tx_backoff;
 331
 332         IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);
 333
 334         if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 335                 iwl_mvm_enter_ctkill(mvm);
 336                 return;
 337         }
 338
 339         if (params->support_ct_kill &&
 340             temperature <= params->ct_kill_exit) {
 341                 iwl_mvm_exit_ctkill(mvm);
 342                 return;
 343         }
 344
 345         if (params->support_dynamic_smps) {
 346                 if (!tt->dynamic_smps &&
 347                     temperature >= params->dynamic_smps_entry) {
 348                         IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 349                         tt->dynamic_smps = true;
 350                         ieee80211_iterate_active_interfaces_atomic(
 351                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 352                                         iwl_mvm_tt_smps_iterator, mvm);
 353                         throttle_enable = true;
 354                 } else if (tt->dynamic_smps &&
 355                            temperature <= params->dynamic_smps_exit) {
 356                         IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 357                         tt->dynamic_smps = false;
 358                         ieee80211_iterate_active_interfaces_atomic(
 359                                         mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 360                                         iwl_mvm_tt_smps_iterator, mvm);
 361                 }
 362         }
 363
 364         if (params->support_tx_protection) {
 365                 if (temperature >= params->tx_protection_entry) {
 366                         iwl_mvm_tt_tx_protection(mvm, true);
 367                         throttle_enable = true;
 368                 } else if (temperature <= params->tx_protection_exit) {
 369                         iwl_mvm_tt_tx_protection(mvm, false);
 370                 }
 371         }
 372
 373         if (params->support_tx_backoff) {
 374                 tx_backoff = tt->min_backoff;
 375                 for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 376                         if (temperature < params->tx_backoff[i].temperature)
 377                                 break;
 378                         tx_backoff = max(tt->min_backoff,
 379                                          params->tx_backoff[i].backoff);
 380                 }
 381                 if (tx_backoff != tt->min_backoff)
 382                         throttle_enable = true;
 383                 if (tt->tx_backoff != tx_backoff)
 384                         iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 385         }
 386
 387         if (!tt->throttle && throttle_enable) {
 388                 IWL_WARN(mvm,
 389                          "Due to high temperature thermal throttling initiated\n");
 390                 tt->throttle = true;
 391         } else if (tt->throttle && !tt->dynamic_smps &&
 392                    tt->tx_backoff == tt->min_backoff &&
 393                    temperature <= params->tx_protection_exit) {
 394                 IWL_WARN(mvm,
 395                          "Temperature is back to normal thermal throttling stopped\n");
 396                 tt->throttle = false;
 397         }
 398 }
 399
 400 static const struct iwl_tt_params iwl_mvm_default_tt_params = {
 401         .ct_kill_entry = 118,
 402         .ct_kill_exit = 96,
 403         .ct_kill_duration = 5,
 404         .dynamic_smps_entry = 114,
 405         .dynamic_smps_exit = 110,
 406         .tx_protection_entry = 114,
 407         .tx_protection_exit = 108,
 408         .tx_backoff = {
 409                 {.temperature = 112, .backoff = 200},
 410                 {.temperature = 113, .backoff = 600},
 411                 {.temperature = 114, .backoff = 1200},
 412                 {.temperature = 115, .backoff = 2000},
 413                 {.temperature = 116, .backoff = 4000},
 414                 {.temperature = 117, .backoff = 10000},
 415         },
 416         .support_ct_kill = true,
 417         .support_dynamic_smps = true,
 418         .support_tx_protection = true,
 419         .support_tx_backoff = true,
 420 };
 421
 422 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 423 {
 424         struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 425
 426         IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");
 427
 428         if (mvm->cfg->thermal_params)
 429                 tt->params = *mvm->cfg->thermal_params;
 430         else
 431                 tt->params = iwl_mvm_default_tt_params;
 432
 433         tt->throttle = false;
 434         tt->dynamic_smps = 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 }