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

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