drivers/net/wireless/iwlwifi/mvm/tt.c - kernel/lockdown - Git at Google

 /******************************************************************************
  *
  * This file is provided under a dual BSD/GPLv2 license.  When using or
  * redistributing this file, you may do so under either license.
  *
  * GPL LICENSE SUMMARY
  *
  * Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
  * published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  * USA
  *
  * The full GNU General Public License is included in this distribution
  * in the file called COPYING.
  *
  * Contact Information:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  * BSD LICENSE
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the
  *    distribution.
  *  * Neither the name Intel Corporation nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  *****************************************************************************/

 #include "mvm.h"

 #define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT	HZ

 static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
 {
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 	u32 duration = mvm->thermal_throttle.params->ct_kill_duration;

 	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 		return;

 	IWL_ERR(mvm, "Enter CT Kill\n");
 	iwl_mvm_set_hw_ctkill_state(mvm, true);

 	tt->throttle = false;
 	tt->dynamic_smps = false;

 	/* Don't schedule an exit work if we're in test mode, since
 	 * the temperature will not change unless we manually set it
 	 * again (or disable testing).
 	 */
 	if (!mvm->temperature_test)
 		schedule_delayed_work(&tt->ct_kill_exit,
 				      round_jiffies_relative(duration * HZ));
 }

 static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
 {
 	if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 		return;

 	IWL_ERR(mvm, "Exit CT Kill\n");
 	iwl_mvm_set_hw_ctkill_state(mvm, false);
 }

 void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
 {
 	/* ignore the notification if we are in test mode */
 	if (mvm->temperature_test)
 		return;

 	if (mvm->temperature == temp)
 		return;

 	mvm->temperature = temp;
 	iwl_mvm_tt_handler(mvm);
 }

 static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
 				    struct iwl_rx_packet *pkt)
 {
 	struct iwl_dts_measurement_notif *notif;
 	int len = iwl_rx_packet_payload_len(pkt);
 	int temp;

 	if (WARN_ON_ONCE(len != sizeof(*notif))) {
 		IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
 		return -EINVAL;
 	}

 	notif = (void *)pkt->data;

 	temp = le32_to_cpu(notif->temp);

 	/* shouldn't be negative, but since it's s32, make sure it isn't */
 	if (WARN_ON_ONCE(temp < 0))
 		temp = 0;

 	IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);

 	return temp;
 }

 static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
 				    struct iwl_rx_packet *pkt, void *data)
 {
 	struct iwl_mvm *mvm =
 		container_of(notif_wait, struct iwl_mvm, notif_wait);
 	int *temp = data;
 	int ret;

 	ret = iwl_mvm_temp_notif_parse(mvm, pkt);
 	if (ret < 0)
 		return true;

 	*temp = ret;

 	return true;
 }

 int iwl_mvm_temp_notif(struct iwl_mvm *mvm,
 		       struct iwl_rx_cmd_buffer *rxb,
 		       struct iwl_device_cmd *cmd)
 {
 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
 	int temp;

 	/* the notification is handled synchronously in ctkill, so skip here */
 	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
 		return 0;

 	temp = iwl_mvm_temp_notif_parse(mvm, pkt);
 	if (temp < 0)
 		return 0;

 	iwl_mvm_tt_temp_changed(mvm, temp);

 	return 0;
 }

 static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
 {
 	struct iwl_dts_measurement_cmd cmd = {
 		.flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
 	};

 	return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
 				    sizeof(cmd), &cmd);
 }

 int iwl_mvm_get_temp(struct iwl_mvm *mvm)
 {
 	struct iwl_notification_wait wait_temp_notif;
 	static const u8 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
 	int ret, temp;

 	lockdep_assert_held(&mvm->mutex);

 	iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
 				   temp_notif, ARRAY_SIZE(temp_notif),
 				   iwl_mvm_temp_notif_wait, &temp);

 	ret = iwl_mvm_get_temp_cmd(mvm);
 	if (ret) {
 		IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
 		iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
 		return ret;
 	}

 	ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
 				    IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
 	if (ret) {
 		IWL_ERR(mvm, "Getting the temperature timed out\n");
 		return ret;
 	}

 	return temp;
 }

 static void check_exit_ctkill(struct work_struct *work)
 {
 	struct iwl_mvm_tt_mgmt *tt;
 	struct iwl_mvm *mvm;
 	u32 duration;
 	s32 temp;

 	tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
 	mvm = container_of(tt, struct iwl_mvm, thermal_throttle);

 	duration = tt->params->ct_kill_duration;

 	mutex_lock(&mvm->mutex);

 	if (__iwl_mvm_mac_start(mvm))
 		goto reschedule;

 	/* make sure the device is available for direct read/writes */
 	if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
 		__iwl_mvm_mac_stop(mvm);
 		goto reschedule;
 	}

 	temp = iwl_mvm_get_temp(mvm);

 	iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);

 	__iwl_mvm_mac_stop(mvm);

 	if (temp < 0)
 		goto reschedule;

 	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);

 	if (temp <= tt->params->ct_kill_exit) {
 		mutex_unlock(&mvm->mutex);
 		iwl_mvm_exit_ctkill(mvm);
 		return;
 	}

 reschedule:
 	mutex_unlock(&mvm->mutex);
 	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
 			      round_jiffies(duration * HZ));
 }

 static void iwl_mvm_tt_smps_iterator(void *_data, u8 *mac,
 				     struct ieee80211_vif *vif)
 {
 	struct iwl_mvm *mvm = _data;
 	enum ieee80211_smps_mode smps_mode;

 	lockdep_assert_held(&mvm->mutex);

 	if (mvm->thermal_throttle.dynamic_smps)
 		smps_mode = IEEE80211_SMPS_DYNAMIC;
 	else
 		smps_mode = IEEE80211_SMPS_AUTOMATIC;

 	if (vif->type != NL80211_IFTYPE_STATION)
 		return;

 	iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
 }

 static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
 {
 	struct ieee80211_sta *sta;
 	struct iwl_mvm_sta *mvmsta;
 	int i, err;

 	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
 						lockdep_is_held(&mvm->mutex));
 		if (IS_ERR_OR_NULL(sta))
 			continue;
 		mvmsta = iwl_mvm_sta_from_mac80211(sta);
 		if (enable == mvmsta->tt_tx_protection)
 			continue;
 		err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
 		if (err) {
 			IWL_ERR(mvm, "Failed to %s Tx protection\n",
 				enable ? "enable" : "disable");
 		} else {
 			IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
 				       enable ? "Enable" : "Disable");
 			mvmsta->tt_tx_protection = enable;
 		}
 	}
 }

 void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
 {
 	struct iwl_host_cmd cmd = {
 		.id = REPLY_THERMAL_MNG_BACKOFF,
 		.len = { sizeof(u32), },
 		.data = { &backoff, },
 	};

 	backoff = max(backoff, mvm->thermal_throttle.min_backoff);

 	if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
 		IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
 			       backoff);
 		mvm->thermal_throttle.tx_backoff = backoff;
 	} else {
 		IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
 	}
 }

 void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
 {
 	const struct iwl_tt_params *params = mvm->thermal_throttle.params;
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
 	s32 temperature = mvm->temperature;
 	bool throttle_enable = false;
 	int i;
 	u32 tx_backoff;

 	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);

 	if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
 		iwl_mvm_enter_ctkill(mvm);
 		return;
 	}

 	if (params->support_ct_kill &&
 	    temperature <= tt->params->ct_kill_exit) {
 		iwl_mvm_exit_ctkill(mvm);
 		return;
 	}

 	if (params->support_dynamic_smps) {
 		if (!tt->dynamic_smps &&
 		    temperature >= params->dynamic_smps_entry) {
 			IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
 			tt->dynamic_smps = true;
 			ieee80211_iterate_active_interfaces_atomic(
 					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 					iwl_mvm_tt_smps_iterator, mvm);
 			throttle_enable = true;
 		} else if (tt->dynamic_smps &&
 			   temperature <= params->dynamic_smps_exit) {
 			IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
 			tt->dynamic_smps = false;
 			ieee80211_iterate_active_interfaces_atomic(
 					mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
 					iwl_mvm_tt_smps_iterator, mvm);
 		}
 	}

 	if (params->support_tx_protection) {
 		if (temperature >= params->tx_protection_entry) {
 			iwl_mvm_tt_tx_protection(mvm, true);
 			throttle_enable = true;
 		} else if (temperature <= params->tx_protection_exit) {
 			iwl_mvm_tt_tx_protection(mvm, false);
 		}
 	}

 	if (params->support_tx_backoff) {
 		tx_backoff = tt->min_backoff;
 		for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
 			if (temperature < params->tx_backoff[i].temperature)
 				break;
 			tx_backoff = max(tt->min_backoff,
 					 params->tx_backoff[i].backoff);
 		}
 		if (tx_backoff != tt->min_backoff)
 			throttle_enable = true;
 		if (tt->tx_backoff != tx_backoff)
 			iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
 	}

 	if (!tt->throttle && throttle_enable) {
 		IWL_WARN(mvm,
 			 "Due to high temperature thermal throttling initiated\n");
 		tt->throttle = true;
 	} else if (tt->throttle && !tt->dynamic_smps &&
 		   tt->tx_backoff == tt->min_backoff &&
 		   temperature <= params->tx_protection_exit) {
 		IWL_WARN(mvm,
 			 "Temperature is back to normal thermal throttling stopped\n");
 		tt->throttle = false;
 	}
 }

 static const struct iwl_tt_params iwl7000_tt_params = {
 	.ct_kill_entry = 118,
 	.ct_kill_exit = 96,
 	.ct_kill_duration = 5,
 	.dynamic_smps_entry = 114,
 	.dynamic_smps_exit = 110,
 	.tx_protection_entry = 114,
 	.tx_protection_exit = 108,
 	.tx_backoff = {
 		{.temperature = 112, .backoff = 200},
 		{.temperature = 113, .backoff = 600},
 		{.temperature = 114, .backoff = 1200},
 		{.temperature = 115, .backoff = 2000},
 		{.temperature = 116, .backoff = 4000},
 		{.temperature = 117, .backoff = 10000},
 	},
 	.support_ct_kill = true,
 	.support_dynamic_smps = true,
 	.support_tx_protection = true,
 	.support_tx_backoff = true,
 };

 static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
 	.ct_kill_entry = 118,
 	.ct_kill_exit = 96,
 	.ct_kill_duration = 5,
 	.dynamic_smps_entry = 114,
 	.dynamic_smps_exit = 110,
 	.tx_protection_entry = 114,
 	.tx_protection_exit = 108,
 	.tx_backoff = {
 		{.temperature = 112, .backoff = 300},
 		{.temperature = 113, .backoff = 800},
 		{.temperature = 114, .backoff = 1500},
 		{.temperature = 115, .backoff = 3000},
 		{.temperature = 116, .backoff = 5000},
 		{.temperature = 117, .backoff = 10000},
 	},
 	.support_ct_kill = true,
 	.support_dynamic_smps = true,
 	.support_tx_protection = true,
 	.support_tx_backoff = true,
 };

 void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
 {
 	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;

 	IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");

 	if (mvm->cfg->high_temp)
 		tt->params = &iwl7000_high_temp_tt_params;
 	else
 		tt->params = &iwl7000_tt_params;

 	tt->throttle = false;
 	tt->dynamic_smps = false;
 	tt->min_backoff = min_backoff;
 	INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
 }

 void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
 {
 	cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
 	IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
 }
	/******************************************************************************
	*
	* This file is provided under a dual BSD/GPLv2 license. When using or
	* redistributing this file, you may do so under either license.
	*
	* GPL LICENSE SUMMARY
	*
	* Copyright(c) 2013 - 2014 Intel Corporation. All rights reserved.
	* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of version 2 of the GNU General Public License as
	* published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
	* USA
	*
	* The full GNU General Public License is included in this distribution
	* in the file called COPYING.
	*
	* Contact Information:
	* Intel Linux Wireless <ilw@linux.intel.com>
	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	*
	* BSD LICENSE
	*
	* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
	* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	* * Neither the name Intel Corporation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*****************************************************************************/

	#include "mvm.h"

	#define IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT HZ

	static void iwl_mvm_enter_ctkill(struct iwl_mvm *mvm)
	{
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
	u32 duration = mvm->thermal_throttle.params->ct_kill_duration;

	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
	return;

	IWL_ERR(mvm, "Enter CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, true);

	tt->throttle = false;
	tt->dynamic_smps = false;

	/* Don't schedule an exit work if we're in test mode, since
	* the temperature will not change unless we manually set it
	* again (or disable testing).
	*/
	if (!mvm->temperature_test)
	schedule_delayed_work(&tt->ct_kill_exit,
	round_jiffies_relative(duration * HZ));
	}

	static void iwl_mvm_exit_ctkill(struct iwl_mvm *mvm)
	{
	if (!test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
	return;

	IWL_ERR(mvm, "Exit CT Kill\n");
	iwl_mvm_set_hw_ctkill_state(mvm, false);
	}

	void iwl_mvm_tt_temp_changed(struct iwl_mvm *mvm, u32 temp)
	{
	/* ignore the notification if we are in test mode */
	if (mvm->temperature_test)
	return;

	if (mvm->temperature == temp)
	return;

	mvm->temperature = temp;
	iwl_mvm_tt_handler(mvm);
	}

	static int iwl_mvm_temp_notif_parse(struct iwl_mvm *mvm,
	struct iwl_rx_packet *pkt)
	{
	struct iwl_dts_measurement_notif *notif;
	int len = iwl_rx_packet_payload_len(pkt);
	int temp;

	if (WARN_ON_ONCE(len != sizeof(*notif))) {
	IWL_ERR(mvm, "Invalid DTS_MEASUREMENT_NOTIFICATION\n");
	return -EINVAL;
	}

	notif = (void *)pkt->data;

	temp = le32_to_cpu(notif->temp);

	/* shouldn't be negative, but since it's s32, make sure it isn't */
	if (WARN_ON_ONCE(temp < 0))
	temp = 0;

	IWL_DEBUG_TEMP(mvm, "DTS_MEASUREMENT_NOTIFICATION - %d\n", temp);

	return temp;
	}

	static bool iwl_mvm_temp_notif_wait(struct iwl_notif_wait_data *notif_wait,
	struct iwl_rx_packet pkt, void data)
	{
	struct iwl_mvm *mvm =
	container_of(notif_wait, struct iwl_mvm, notif_wait);
	int *temp = data;
	int ret;

	ret = iwl_mvm_temp_notif_parse(mvm, pkt);
	if (ret < 0)
	return true;

	*temp = ret;

	return true;
	}

	int iwl_mvm_temp_notif(struct iwl_mvm *mvm,
	struct iwl_rx_cmd_buffer *rxb,
	struct iwl_device_cmd *cmd)
	{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	int temp;

	/* the notification is handled synchronously in ctkill, so skip here */
	if (test_bit(IWL_MVM_STATUS_HW_CTKILL, &mvm->status))
	return 0;

	temp = iwl_mvm_temp_notif_parse(mvm, pkt);
	if (temp < 0)
	return 0;

	iwl_mvm_tt_temp_changed(mvm, temp);

	return 0;
	}

	static int iwl_mvm_get_temp_cmd(struct iwl_mvm *mvm)
	{
	struct iwl_dts_measurement_cmd cmd = {
	.flags = cpu_to_le32(DTS_TRIGGER_CMD_FLAGS_TEMP),
	};

	return iwl_mvm_send_cmd_pdu(mvm, CMD_DTS_MEASUREMENT_TRIGGER, 0,
	sizeof(cmd), &cmd);
	}

	int iwl_mvm_get_temp(struct iwl_mvm *mvm)
	{
	struct iwl_notification_wait wait_temp_notif;
	static const u8 temp_notif[] = { DTS_MEASUREMENT_NOTIFICATION };
	int ret, temp;

	lockdep_assert_held(&mvm->mutex);

	iwl_init_notification_wait(&mvm->notif_wait, &wait_temp_notif,
	temp_notif, ARRAY_SIZE(temp_notif),
	iwl_mvm_temp_notif_wait, &temp);

	ret = iwl_mvm_get_temp_cmd(mvm);
	if (ret) {
	IWL_ERR(mvm, "Failed to get the temperature (err=%d)\n", ret);
	iwl_remove_notification(&mvm->notif_wait, &wait_temp_notif);
	return ret;
	}

	ret = iwl_wait_notification(&mvm->notif_wait, &wait_temp_notif,
	IWL_MVM_TEMP_NOTIF_WAIT_TIMEOUT);
	if (ret) {
	IWL_ERR(mvm, "Getting the temperature timed out\n");
	return ret;
	}

	return temp;
	}

	static void check_exit_ctkill(struct work_struct *work)
	{
	struct iwl_mvm_tt_mgmt *tt;
	struct iwl_mvm *mvm;
	u32 duration;
	s32 temp;

	tt = container_of(work, struct iwl_mvm_tt_mgmt, ct_kill_exit.work);
	mvm = container_of(tt, struct iwl_mvm, thermal_throttle);

	duration = tt->params->ct_kill_duration;

	mutex_lock(&mvm->mutex);

	if (__iwl_mvm_mac_start(mvm))
	goto reschedule;

	/* make sure the device is available for direct read/writes */
	if (iwl_mvm_ref_sync(mvm, IWL_MVM_REF_CHECK_CTKILL)) {
	__iwl_mvm_mac_stop(mvm);
	goto reschedule;
	}

	temp = iwl_mvm_get_temp(mvm);

	iwl_mvm_unref(mvm, IWL_MVM_REF_CHECK_CTKILL);

	__iwl_mvm_mac_stop(mvm);

	if (temp < 0)
	goto reschedule;

	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", temp);

	if (temp <= tt->params->ct_kill_exit) {
	mutex_unlock(&mvm->mutex);
	iwl_mvm_exit_ctkill(mvm);
	return;
	}

	reschedule:
	mutex_unlock(&mvm->mutex);
	schedule_delayed_work(&mvm->thermal_throttle.ct_kill_exit,
	round_jiffies(duration * HZ));
	}

	static void iwl_mvm_tt_smps_iterator(void _data, u8 mac,
	struct ieee80211_vif *vif)
	{
	struct iwl_mvm *mvm = _data;
	enum ieee80211_smps_mode smps_mode;

	lockdep_assert_held(&mvm->mutex);

	if (mvm->thermal_throttle.dynamic_smps)
	smps_mode = IEEE80211_SMPS_DYNAMIC;
	else
	smps_mode = IEEE80211_SMPS_AUTOMATIC;

	if (vif->type != NL80211_IFTYPE_STATION)
	return;

	iwl_mvm_update_smps(mvm, vif, IWL_MVM_SMPS_REQ_TT, smps_mode);
	}

	static void iwl_mvm_tt_tx_protection(struct iwl_mvm *mvm, bool enable)
	{
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	int i, err;

	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
	lockdep_is_held(&mvm->mutex));
	if (IS_ERR_OR_NULL(sta))
	continue;
	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	if (enable == mvmsta->tt_tx_protection)
	continue;
	err = iwl_mvm_tx_protection(mvm, mvmsta, enable);
	if (err) {
	IWL_ERR(mvm, "Failed to %s Tx protection\n",
	enable ? "enable" : "disable");
	} else {
	IWL_DEBUG_TEMP(mvm, "%s Tx protection\n",
	enable ? "Enable" : "Disable");
	mvmsta->tt_tx_protection = enable;
	}
	}
	}

	void iwl_mvm_tt_tx_backoff(struct iwl_mvm *mvm, u32 backoff)
	{
	struct iwl_host_cmd cmd = {
	.id = REPLY_THERMAL_MNG_BACKOFF,
	.len = { sizeof(u32), },
	.data = { &backoff, },
	};

	backoff = max(backoff, mvm->thermal_throttle.min_backoff);

	if (iwl_mvm_send_cmd(mvm, &cmd) == 0) {
	IWL_DEBUG_TEMP(mvm, "Set Thermal Tx backoff to: %u\n",
	backoff);
	mvm->thermal_throttle.tx_backoff = backoff;
	} else {
	IWL_ERR(mvm, "Failed to change Thermal Tx backoff\n");
	}
	}

	void iwl_mvm_tt_handler(struct iwl_mvm *mvm)
	{
	const struct iwl_tt_params *params = mvm->thermal_throttle.params;
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;
	s32 temperature = mvm->temperature;
	bool throttle_enable = false;
	int i;
	u32 tx_backoff;

	IWL_DEBUG_TEMP(mvm, "NIC temperature: %d\n", mvm->temperature);

	if (params->support_ct_kill && temperature >= params->ct_kill_entry) {
	iwl_mvm_enter_ctkill(mvm);
	return;
	}

	if (params->support_ct_kill &&
	temperature <= tt->params->ct_kill_exit) {
	iwl_mvm_exit_ctkill(mvm);
	return;
	}

	if (params->support_dynamic_smps) {
	if (!tt->dynamic_smps &&
	temperature >= params->dynamic_smps_entry) {
	IWL_DEBUG_TEMP(mvm, "Enable dynamic SMPS\n");
	tt->dynamic_smps = true;
	ieee80211_iterate_active_interfaces_atomic(
	mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_tt_smps_iterator, mvm);
	throttle_enable = true;
	} else if (tt->dynamic_smps &&
	temperature <= params->dynamic_smps_exit) {
	IWL_DEBUG_TEMP(mvm, "Disable dynamic SMPS\n");
	tt->dynamic_smps = false;
	ieee80211_iterate_active_interfaces_atomic(
	mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_tt_smps_iterator, mvm);
	}
	}

	if (params->support_tx_protection) {
	if (temperature >= params->tx_protection_entry) {
	iwl_mvm_tt_tx_protection(mvm, true);
	throttle_enable = true;
	} else if (temperature <= params->tx_protection_exit) {
	iwl_mvm_tt_tx_protection(mvm, false);
	}
	}

	if (params->support_tx_backoff) {
	tx_backoff = tt->min_backoff;
	for (i = 0; i < TT_TX_BACKOFF_SIZE; i++) {
	if (temperature < params->tx_backoff[i].temperature)
	break;
	tx_backoff = max(tt->min_backoff,
	params->tx_backoff[i].backoff);
	}
	if (tx_backoff != tt->min_backoff)
	throttle_enable = true;
	if (tt->tx_backoff != tx_backoff)
	iwl_mvm_tt_tx_backoff(mvm, tx_backoff);
	}

	if (!tt->throttle && throttle_enable) {
	IWL_WARN(mvm,
	"Due to high temperature thermal throttling initiated\n");
	tt->throttle = true;
	} else if (tt->throttle && !tt->dynamic_smps &&
	tt->tx_backoff == tt->min_backoff &&
	temperature <= params->tx_protection_exit) {
	IWL_WARN(mvm,
	"Temperature is back to normal thermal throttling stopped\n");
	tt->throttle = false;
	}
	}

	static const struct iwl_tt_params iwl7000_tt_params = {
	.ct_kill_entry = 118,
	.ct_kill_exit = 96,
	.ct_kill_duration = 5,
	.dynamic_smps_entry = 114,
	.dynamic_smps_exit = 110,
	.tx_protection_entry = 114,
	.tx_protection_exit = 108,
	.tx_backoff = {
	{.temperature = 112, .backoff = 200},
	{.temperature = 113, .backoff = 600},
	{.temperature = 114, .backoff = 1200},
	{.temperature = 115, .backoff = 2000},
	{.temperature = 116, .backoff = 4000},
	{.temperature = 117, .backoff = 10000},
	},
	.support_ct_kill = true,
	.support_dynamic_smps = true,
	.support_tx_protection = true,
	.support_tx_backoff = true,
	};

	static const struct iwl_tt_params iwl7000_high_temp_tt_params = {
	.ct_kill_entry = 118,
	.ct_kill_exit = 96,
	.ct_kill_duration = 5,
	.dynamic_smps_entry = 114,
	.dynamic_smps_exit = 110,
	.tx_protection_entry = 114,
	.tx_protection_exit = 108,
	.tx_backoff = {
	{.temperature = 112, .backoff = 300},
	{.temperature = 113, .backoff = 800},
	{.temperature = 114, .backoff = 1500},
	{.temperature = 115, .backoff = 3000},
	{.temperature = 116, .backoff = 5000},
	{.temperature = 117, .backoff = 10000},
	},
	.support_ct_kill = true,
	.support_dynamic_smps = true,
	.support_tx_protection = true,
	.support_tx_backoff = true,
	};

	void iwl_mvm_tt_initialize(struct iwl_mvm *mvm, u32 min_backoff)
	{
	struct iwl_mvm_tt_mgmt *tt = &mvm->thermal_throttle;

	IWL_DEBUG_TEMP(mvm, "Initialize Thermal Throttling\n");

	if (mvm->cfg->high_temp)
	tt->params = &iwl7000_high_temp_tt_params;
	else
	tt->params = &iwl7000_tt_params;

	tt->throttle = false;
	tt->dynamic_smps = false;
	tt->min_backoff = min_backoff;
	INIT_DELAYED_WORK(&tt->ct_kill_exit, check_exit_ctkill);
	}

	void iwl_mvm_tt_exit(struct iwl_mvm *mvm)
	{
	cancel_delayed_work_sync(&mvm->thermal_throttle.ct_kill_exit);
	IWL_DEBUG_TEMP(mvm, "Exit Thermal Throttling\n");
	}