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linux/drivers/net/wireless/iwlwifi/iwl-power.c
Johannes Berg e312c24cf8 iwlwifi: automatically adjust sleep level 
Depending on required latency requested by pm_qos (via mac80211)
we can automatically adjust the sleep state. Also, mac80211 has
a user-visible dynamic sleep feature where we are supposed to
stay awake after sending/receiving frames to better receive
response frames to our packets, this can be integrated into the
sleep command.

Currently, and this patch doesn't change that yet, we default
to using sleep level 1 if PS is enabled. With a module parameter
to iwlcore, automatic adjustment to changing network latency
requirements can be enabled -- this isn't yet the default due
to requiring more testing.

The goal is to enable automatic adjustment and then go into the
deepest possible sleep state possible depending on the networking
latency requirements.

This patch does, however, enable IEEE80211_HW_SUPPORTS_DYNAMIC_PS
to avoid the double-timer (one in software and one in the device)
when transmitting -- the exact timeout may be ignored but that is
not of big concern.

Note also that we keep the hard-coded power indices around for
thermal throttling -- the specification of that calls for using
the specified power levels. Those can also be selected in debugfs
to allow easier testing of such parameters.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2009-08-14 09:13:50 -04:00

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/******************************************************************************
*
* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
*
* Portions of this file are derived from the ipw3945 project, as well
* as portions of the ieee80211 subsystem header files.
*
* 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 LICENSE.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*****************************************************************************/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/mac80211.h>
#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-commands.h"
#include "iwl-debug.h"
#include "iwl-power.h"
/*
* Setting power level allows the card to go to sleep when not busy.
*
* We calculate a sleep command based on the required latency, which
* we get from mac80211. In order to handle thermal throttling, we can
* also use pre-defined power levels.
*/
/*
* For now, keep using power level 1 instead of automatically
* adjusting ...
*/
bool no_sleep_autoadjust = true;
module_param(no_sleep_autoadjust, bool, S_IRUGO);
MODULE_PARM_DESC(no_sleep_autoadjust,
"don't automatically adjust sleep level "
"according to maximum network latency");
/*
* This defines the old power levels. They are still used by default
* (level 1) and for thermal throttle (levels 3 through 5)
*/
struct iwl_power_vec_entry {
struct iwl_powertable_cmd cmd;
u8 no_dtim;
};
#define IWL_DTIM_RANGE_0_MAX 2
#define IWL_DTIM_RANGE_1_MAX 10
#define NOSLP cpu_to_le16(0), 0, 0
#define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
#define TU_TO_USEC 1024
#define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
#define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
cpu_to_le32(X1), \
cpu_to_le32(X2), \
cpu_to_le32(X3), \
cpu_to_le32(X4)}
/* default power management (not Tx power) table values */
/* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
};
/* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 7, 10, 10)}, 2}
};
/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
{{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
{{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
};
static void iwl_static_sleep_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd,
enum iwl_power_level lvl, int period)
{
const struct iwl_power_vec_entry *table;
int max_sleep, i;
bool skip;
table = range_2;
if (period < IWL_DTIM_RANGE_1_MAX)
table = range_1;
if (period < IWL_DTIM_RANGE_0_MAX)
table = range_0;
BUG_ON(lvl < 0 || lvl >= IWL_POWER_NUM);
*cmd = table[lvl].cmd;
if (period == 0) {
skip = false;
period = 1;
} else {
skip = !!table[lvl].no_dtim;
}
if (skip) {
__le32 slp_itrvl = cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1];
max_sleep = le32_to_cpu(slp_itrvl);
if (max_sleep == 0xFF)
max_sleep = period * (skip + 1);
else if (max_sleep > period)
max_sleep = (le32_to_cpu(slp_itrvl) / period) * period;
cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
} else {
max_sleep = period;
cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
}
for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
if (priv->power_data.pci_pm)
cmd->flags |= IWL_POWER_PCI_PM_MSK;
else
cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
}
/* default Thermal Throttling transaction table
* Current state | Throttling Down | Throttling Up
*=============================================================================
* Condition Nxt State Condition Nxt State Condition Nxt State
*-----------------------------------------------------------------------------
* IWL_TI_0 T >= 115 CT_KILL 115>T>=105 TI_1 N/A N/A
* IWL_TI_1 T >= 115 CT_KILL 115>T>=110 TI_2 T<=95 TI_0
* IWL_TI_2 T >= 115 CT_KILL T<=100 TI_1
* IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
*=============================================================================
*/
static const struct iwl_tt_trans tt_range_0[IWL_TI_STATE_MAX - 1] = {
{IWL_TI_0, IWL_ABSOLUTE_ZERO, 104},
{IWL_TI_1, 105, CT_KILL_THRESHOLD},
{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_1[IWL_TI_STATE_MAX - 1] = {
{IWL_TI_0, IWL_ABSOLUTE_ZERO, 95},
{IWL_TI_2, 110, CT_KILL_THRESHOLD},
{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_2[IWL_TI_STATE_MAX - 1] = {
{IWL_TI_1, IWL_ABSOLUTE_ZERO, 100},
{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
{IWL_TI_CT_KILL, CT_KILL_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
static const struct iwl_tt_trans tt_range_3[IWL_TI_STATE_MAX - 1] = {
{IWL_TI_0, IWL_ABSOLUTE_ZERO, CT_KILL_EXIT_THRESHOLD},
{IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX},
{IWL_TI_CT_KILL, CT_KILL_EXIT_THRESHOLD + 1, IWL_ABSOLUTE_MAX}
};
/* Advance Thermal Throttling default restriction table */
static const struct iwl_tt_restriction restriction_range[IWL_TI_STATE_MAX] = {
{IWL_ANT_OK_MULTI, IWL_ANT_OK_MULTI, true },
{IWL_ANT_OK_SINGLE, IWL_ANT_OK_MULTI, true },
{IWL_ANT_OK_SINGLE, IWL_ANT_OK_SINGLE, false },
{IWL_ANT_OK_NONE, IWL_ANT_OK_NONE, false }
};
static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd)
{
memset(cmd, 0, sizeof(*cmd));
if (priv->power_data.pci_pm)
cmd->flags |= IWL_POWER_PCI_PM_MSK;
IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
}
static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
struct iwl_powertable_cmd *cmd,
int dynps_ms, int wakeup_period)
{
int i;
memset(cmd, 0, sizeof(*cmd));
cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
IWL_POWER_FAST_PD; /* no use seeing frames for others */
if (priv->power_data.pci_pm)
cmd->flags |= IWL_POWER_PCI_PM_MSK;
cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
cmd->sleep_interval[i] = cpu_to_le32(wakeup_period);
IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
}
static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
{
IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
le32_to_cpu(cmd->sleep_interval[0]),
le32_to_cpu(cmd->sleep_interval[1]),
le32_to_cpu(cmd->sleep_interval[2]),
le32_to_cpu(cmd->sleep_interval[3]),
le32_to_cpu(cmd->sleep_interval[4]));
return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
sizeof(struct iwl_powertable_cmd), cmd);
}
int iwl_power_update_mode(struct iwl_priv *priv, bool force)
{
int ret = 0;
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
bool enabled = (priv->iw_mode == NL80211_IFTYPE_STATION) &&
(priv->hw->conf.flags & IEEE80211_CONF_PS);
bool update_chains;
struct iwl_powertable_cmd cmd;
int dtimper;
/* Don't update the RX chain when chain noise calibration is running */
update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
if (priv->vif)
dtimper = priv->vif->bss_conf.dtim_period;
else
dtimper = 1;
/* TT power setting overwrites everything */
if (tt->state >= IWL_TI_1)
iwl_static_sleep_cmd(priv, &cmd, tt->tt_power_mode, dtimper);
else if (!enabled)
iwl_power_sleep_cam_cmd(priv, &cmd);
else if (priv->power_data.debug_sleep_level_override >= 0)
iwl_static_sleep_cmd(priv, &cmd,
priv->power_data.debug_sleep_level_override,
dtimper);
else if (no_sleep_autoadjust)
iwl_static_sleep_cmd(priv, &cmd, IWL_POWER_INDEX_1, dtimper);
else
iwl_power_fill_sleep_cmd(priv, &cmd,
priv->hw->conf.dynamic_ps_timeout,
priv->hw->conf.max_sleep_period);
if (iwl_is_ready_rf(priv) &&
(memcmp(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd)) || force)) {
if (cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
set_bit(STATUS_POWER_PMI, &priv->status);
ret = iwl_set_power(priv, &cmd);
if (!ret) {
if (!(cmd.flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
clear_bit(STATUS_POWER_PMI, &priv->status);
if (priv->cfg->ops->lib->update_chain_flags &&
update_chains)
priv->cfg->ops->lib->update_chain_flags(priv);
else
IWL_DEBUG_POWER(priv,
"Cannot update the power, chain noise "
"calibration running: %d\n",
priv->chain_noise_data.state);
memcpy(&priv->power_data.sleep_cmd, &cmd, sizeof(cmd));
} else
IWL_ERR(priv, "set power fail, ret = %d", ret);
}
return ret;
}
EXPORT_SYMBOL(iwl_power_update_mode);
bool iwl_ht_enabled(struct iwl_priv *priv)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
struct iwl_tt_restriction *restriction;
if (!priv->thermal_throttle.advanced_tt)
return true;
restriction = tt->restriction + tt->state;
return restriction->is_ht;
}
EXPORT_SYMBOL(iwl_ht_enabled);
enum iwl_antenna_ok iwl_tx_ant_restriction(struct iwl_priv *priv)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
struct iwl_tt_restriction *restriction;
if (!priv->thermal_throttle.advanced_tt)
return IWL_ANT_OK_MULTI;
restriction = tt->restriction + tt->state;
return restriction->tx_stream;
}
EXPORT_SYMBOL(iwl_tx_ant_restriction);
enum iwl_antenna_ok iwl_rx_ant_restriction(struct iwl_priv *priv)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
struct iwl_tt_restriction *restriction;
if (!priv->thermal_throttle.advanced_tt)
return IWL_ANT_OK_MULTI;
restriction = tt->restriction + tt->state;
return restriction->rx_stream;
}
#define CT_KILL_EXIT_DURATION (5) /* 5 seconds duration */
/*
* toggle the bit to wake up uCode and check the temperature
* if the temperature is below CT, uCode will stay awake and send card
* state notification with CT_KILL bit clear to inform Thermal Throttling
* Management to change state. Otherwise, uCode will go back to sleep
* without doing anything, driver should continue the 5 seconds timer
* to wake up uCode for temperature check until temperature drop below CT
*/
static void iwl_tt_check_exit_ct_kill(unsigned long data)
{
struct iwl_priv *priv = (struct iwl_priv *)data;
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
unsigned long flags;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
if (tt->state == IWL_TI_CT_KILL) {
if (priv->thermal_throttle.ct_kill_toggle) {
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
priv->thermal_throttle.ct_kill_toggle = false;
} else {
iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
priv->thermal_throttle.ct_kill_toggle = true;
}
iwl_read32(priv, CSR_UCODE_DRV_GP1);
spin_lock_irqsave(&priv->reg_lock, flags);
if (!iwl_grab_nic_access(priv))
iwl_release_nic_access(priv);
spin_unlock_irqrestore(&priv->reg_lock, flags);
/* Reschedule the ct_kill timer to occur in
* CT_KILL_EXIT_DURATION seconds to ensure we get a
* thermal update */
mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
CT_KILL_EXIT_DURATION * HZ);
}
}
static void iwl_perform_ct_kill_task(struct iwl_priv *priv,
bool stop)
{
if (stop) {
IWL_DEBUG_POWER(priv, "Stop all queues\n");
if (priv->mac80211_registered)
ieee80211_stop_queues(priv->hw);
IWL_DEBUG_POWER(priv,
"Schedule 5 seconds CT_KILL Timer\n");
mod_timer(&priv->thermal_throttle.ct_kill_exit_tm, jiffies +
CT_KILL_EXIT_DURATION * HZ);
} else {
IWL_DEBUG_POWER(priv, "Wake all queues\n");
if (priv->mac80211_registered)
ieee80211_wake_queues(priv->hw);
}
}
#define IWL_MINIMAL_POWER_THRESHOLD (CT_KILL_THRESHOLD_LEGACY)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_2 (100)
#define IWL_REDUCED_PERFORMANCE_THRESHOLD_1 (90)
/*
* Legacy thermal throttling
* 1) Avoid NIC destruction due to high temperatures
* Chip will identify dangerously high temperatures that can
* harm the device and will power down
* 2) Avoid the NIC power down due to high temperature
* Throttle early enough to lower the power consumption before
* drastic steps are needed
*/
static void iwl_legacy_tt_handler(struct iwl_priv *priv, s32 temp)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
enum iwl_tt_state old_state;
#ifdef CONFIG_IWLWIFI_DEBUG
if ((tt->tt_previous_temp) &&
(temp > tt->tt_previous_temp) &&
((temp - tt->tt_previous_temp) >
IWL_TT_INCREASE_MARGIN)) {
IWL_DEBUG_POWER(priv,
"Temperature increase %d degree Celsius\n",
(temp - tt->tt_previous_temp));
}
#endif
old_state = tt->state;
/* in Celsius */
if (temp >= IWL_MINIMAL_POWER_THRESHOLD)
tt->state = IWL_TI_CT_KILL;
else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_2)
tt->state = IWL_TI_2;
else if (temp >= IWL_REDUCED_PERFORMANCE_THRESHOLD_1)
tt->state = IWL_TI_1;
else
tt->state = IWL_TI_0;
#ifdef CONFIG_IWLWIFI_DEBUG
tt->tt_previous_temp = temp;
#endif
if (tt->state != old_state) {
switch (tt->state) {
case IWL_TI_0:
/*
* When the system is ready to go back to IWL_TI_0
* we only have to call iwl_power_update_mode() to
* do so.
*/
break;
case IWL_TI_1:
tt->tt_power_mode = IWL_POWER_INDEX_3;
break;
case IWL_TI_2:
tt->tt_power_mode = IWL_POWER_INDEX_4;
break;
default:
tt->tt_power_mode = IWL_POWER_INDEX_5;
break;
}
mutex_lock(&priv->mutex);
if (iwl_power_update_mode(priv, true)) {
/* TT state not updated
* try again during next temperature read
*/
tt->state = old_state;
IWL_ERR(priv, "Cannot update power mode, "
"TT state not updated\n");
} else {
if (tt->state == IWL_TI_CT_KILL)
iwl_perform_ct_kill_task(priv, true);
else if (old_state == IWL_TI_CT_KILL &&
tt->state != IWL_TI_CT_KILL)
iwl_perform_ct_kill_task(priv, false);
IWL_DEBUG_POWER(priv, "Temperature state changed %u\n",
tt->state);
IWL_DEBUG_POWER(priv, "Power Index change to %u\n",
tt->tt_power_mode);
}
mutex_unlock(&priv->mutex);
}
}
/*
* Advance thermal throttling
* 1) Avoid NIC destruction due to high temperatures
* Chip will identify dangerously high temperatures that can
* harm the device and will power down
* 2) Avoid the NIC power down due to high temperature
* Throttle early enough to lower the power consumption before
* drastic steps are needed
* Actions include relaxing the power down sleep thresholds and
* decreasing the number of TX streams
* 3) Avoid throughput performance impact as much as possible
*
*=============================================================================
* Condition Nxt State Condition Nxt State Condition Nxt State
*-----------------------------------------------------------------------------
* IWL_TI_0 T >= 115 CT_KILL 115>T>=105 TI_1 N/A N/A
* IWL_TI_1 T >= 115 CT_KILL 115>T>=110 TI_2 T<=95 TI_0
* IWL_TI_2 T >= 115 CT_KILL T<=100 TI_1
* IWL_CT_KILL N/A N/A N/A N/A T<=95 TI_0
*=============================================================================
*/
static void iwl_advance_tt_handler(struct iwl_priv *priv, s32 temp)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
int i;
bool changed = false;
enum iwl_tt_state old_state;
struct iwl_tt_trans *transaction;
old_state = tt->state;
for (i = 0; i < IWL_TI_STATE_MAX - 1; i++) {
/* based on the current TT state,
* find the curresponding transaction table
* each table has (IWL_TI_STATE_MAX - 1) entries
* tt->transaction + ((old_state * (IWL_TI_STATE_MAX - 1))
* will advance to the correct table.
* then based on the current temperature
* find the next state need to transaction to
* go through all the possible (IWL_TI_STATE_MAX - 1) entries
* in the current table to see if transaction is needed
*/
transaction = tt->transaction +
((old_state * (IWL_TI_STATE_MAX - 1)) + i);
if (temp >= transaction->tt_low &&
temp <= transaction->tt_high) {
#ifdef CONFIG_IWLWIFI_DEBUG
if ((tt->tt_previous_temp) &&
(temp > tt->tt_previous_temp) &&
((temp - tt->tt_previous_temp) >
IWL_TT_INCREASE_MARGIN)) {
IWL_DEBUG_POWER(priv,
"Temperature increase %d "
"degree Celsius\n",
(temp - tt->tt_previous_temp));
}
tt->tt_previous_temp = temp;
#endif
if (old_state !=
transaction->next_state) {
changed = true;
tt->state =
transaction->next_state;
}
break;
}
}
if (changed) {
struct iwl_rxon_cmd *rxon = &priv->staging_rxon;
if (tt->state >= IWL_TI_1) {
/* force PI = IWL_POWER_INDEX_5 in the case of TI > 0 */
tt->tt_power_mode = IWL_POWER_INDEX_5;
if (!iwl_ht_enabled(priv))
/* disable HT */
rxon->flags &= ~(RXON_FLG_CHANNEL_MODE_MSK |
RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK |
RXON_FLG_HT40_PROT_MSK |
RXON_FLG_HT_PROT_MSK);
else {
/* check HT capability and set
* according to the system HT capability
* in case get disabled before */
iwl_set_rxon_ht(priv, &priv->current_ht_config);
}
} else {
/*
* restore system power setting -- it will be
* recalculated automatically.
*/
/* check HT capability and set
* according to the system HT capability
* in case get disabled before */
iwl_set_rxon_ht(priv, &priv->current_ht_config);
}
mutex_lock(&priv->mutex);
if (iwl_power_update_mode(priv, true)) {
/* TT state not updated
* try again during next temperature read
*/
IWL_ERR(priv, "Cannot update power mode, "
"TT state not updated\n");
tt->state = old_state;
} else {
IWL_DEBUG_POWER(priv,
"Thermal Throttling to new state: %u\n",
tt->state);
if (old_state != IWL_TI_CT_KILL &&
tt->state == IWL_TI_CT_KILL) {
IWL_DEBUG_POWER(priv, "Enter IWL_TI_CT_KILL\n");
iwl_perform_ct_kill_task(priv, true);
} else if (old_state == IWL_TI_CT_KILL &&
tt->state != IWL_TI_CT_KILL) {
IWL_DEBUG_POWER(priv, "Exit IWL_TI_CT_KILL\n");
iwl_perform_ct_kill_task(priv, false);
}
}
mutex_unlock(&priv->mutex);
}
}
/* Card State Notification indicated reach critical temperature
* if PSP not enable, no Thermal Throttling function will be performed
* just set the GP1 bit to acknowledge the event
* otherwise, go into IWL_TI_CT_KILL state
* since Card State Notification will not provide any temperature reading
* for Legacy mode
* so just pass the CT_KILL temperature to iwl_legacy_tt_handler()
* for advance mode
* pass CT_KILL_THRESHOLD+1 to make sure move into IWL_TI_CT_KILL state
*/
static void iwl_bg_ct_enter(struct work_struct *work)
{
struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_enter);
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
if (!iwl_is_ready(priv))
return;
if (tt->state != IWL_TI_CT_KILL) {
IWL_ERR(priv, "Device reached critical temperature "
"- ucode going to sleep!\n");
if (!priv->thermal_throttle.advanced_tt)
iwl_legacy_tt_handler(priv,
IWL_MINIMAL_POWER_THRESHOLD);
else
iwl_advance_tt_handler(priv,
CT_KILL_THRESHOLD + 1);
}
}
/* Card State Notification indicated out of critical temperature
* since Card State Notification will not provide any temperature reading
* so pass the IWL_REDUCED_PERFORMANCE_THRESHOLD_2 temperature
* to iwl_legacy_tt_handler() to get out of IWL_CT_KILL state
*/
static void iwl_bg_ct_exit(struct work_struct *work)
{
struct iwl_priv *priv = container_of(work, struct iwl_priv, ct_exit);
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
if (!iwl_is_ready(priv))
return;
/* stop ct_kill_exit_tm timer */
del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
if (tt->state == IWL_TI_CT_KILL) {
IWL_ERR(priv,
"Device temperature below critical"
"- ucode awake!\n");
if (!priv->thermal_throttle.advanced_tt)
iwl_legacy_tt_handler(priv,
IWL_REDUCED_PERFORMANCE_THRESHOLD_2);
else
iwl_advance_tt_handler(priv, CT_KILL_EXIT_THRESHOLD);
}
}
void iwl_tt_enter_ct_kill(struct iwl_priv *priv)
{
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
IWL_DEBUG_POWER(priv, "Queueing critical temperature enter.\n");
queue_work(priv->workqueue, &priv->ct_enter);
}
EXPORT_SYMBOL(iwl_tt_enter_ct_kill);
void iwl_tt_exit_ct_kill(struct iwl_priv *priv)
{
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
IWL_DEBUG_POWER(priv, "Queueing critical temperature exit.\n");
queue_work(priv->workqueue, &priv->ct_exit);
}
EXPORT_SYMBOL(iwl_tt_exit_ct_kill);
static void iwl_bg_tt_work(struct work_struct *work)
{
struct iwl_priv *priv = container_of(work, struct iwl_priv, tt_work);
s32 temp = priv->temperature; /* degrees CELSIUS except 4965 */
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
temp = KELVIN_TO_CELSIUS(priv->temperature);
if (!priv->thermal_throttle.advanced_tt)
iwl_legacy_tt_handler(priv, temp);
else
iwl_advance_tt_handler(priv, temp);
}
void iwl_tt_handler(struct iwl_priv *priv)
{
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
IWL_DEBUG_POWER(priv, "Queueing thermal throttling work.\n");
queue_work(priv->workqueue, &priv->tt_work);
}
EXPORT_SYMBOL(iwl_tt_handler);
/* Thermal throttling initialization
* For advance thermal throttling:
* Initialize Thermal Index and temperature threshold table
* Initialize thermal throttling restriction table
*/
void iwl_tt_initialize(struct iwl_priv *priv)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
int size = sizeof(struct iwl_tt_trans) * (IWL_TI_STATE_MAX - 1);
struct iwl_tt_trans *transaction;
IWL_DEBUG_POWER(priv, "Initialize Thermal Throttling \n");
memset(tt, 0, sizeof(struct iwl_tt_mgmt));
tt->state = IWL_TI_0;
init_timer(&priv->thermal_throttle.ct_kill_exit_tm);
priv->thermal_throttle.ct_kill_exit_tm.data = (unsigned long)priv;
priv->thermal_throttle.ct_kill_exit_tm.function = iwl_tt_check_exit_ct_kill;
/* setup deferred ct kill work */
INIT_WORK(&priv->tt_work, iwl_bg_tt_work);
INIT_WORK(&priv->ct_enter, iwl_bg_ct_enter);
INIT_WORK(&priv->ct_exit, iwl_bg_ct_exit);
switch (priv->hw_rev & CSR_HW_REV_TYPE_MSK) {
case CSR_HW_REV_TYPE_6x00:
case CSR_HW_REV_TYPE_6x50:
IWL_DEBUG_POWER(priv, "Advanced Thermal Throttling\n");
tt->restriction = kzalloc(sizeof(struct iwl_tt_restriction) *
IWL_TI_STATE_MAX, GFP_KERNEL);
tt->transaction = kzalloc(sizeof(struct iwl_tt_trans) *
IWL_TI_STATE_MAX * (IWL_TI_STATE_MAX - 1),
GFP_KERNEL);
if (!tt->restriction || !tt->transaction) {
IWL_ERR(priv, "Fallback to Legacy Throttling\n");
priv->thermal_throttle.advanced_tt = false;
kfree(tt->restriction);
tt->restriction = NULL;
kfree(tt->transaction);
tt->transaction = NULL;
} else {
transaction = tt->transaction +
(IWL_TI_0 * (IWL_TI_STATE_MAX - 1));
memcpy(transaction, &tt_range_0[0], size);
transaction = tt->transaction +
(IWL_TI_1 * (IWL_TI_STATE_MAX - 1));
memcpy(transaction, &tt_range_1[0], size);
transaction = tt->transaction +
(IWL_TI_2 * (IWL_TI_STATE_MAX - 1));
memcpy(transaction, &tt_range_2[0], size);
transaction = tt->transaction +
(IWL_TI_CT_KILL * (IWL_TI_STATE_MAX - 1));
memcpy(transaction, &tt_range_3[0], size);
size = sizeof(struct iwl_tt_restriction) *
IWL_TI_STATE_MAX;
memcpy(tt->restriction,
&restriction_range[0], size);
priv->thermal_throttle.advanced_tt = true;
}
break;
default:
IWL_DEBUG_POWER(priv, "Legacy Thermal Throttling\n");
priv->thermal_throttle.advanced_tt = false;
break;
}
}
EXPORT_SYMBOL(iwl_tt_initialize);
/* cleanup thermal throttling management related memory and timer */
void iwl_tt_exit(struct iwl_priv *priv)
{
struct iwl_tt_mgmt *tt = &priv->thermal_throttle;
/* stop ct_kill_exit_tm timer if activated */
del_timer_sync(&priv->thermal_throttle.ct_kill_exit_tm);
cancel_work_sync(&priv->tt_work);
cancel_work_sync(&priv->ct_enter);
cancel_work_sync(&priv->ct_exit);
if (priv->thermal_throttle.advanced_tt) {
/* free advance thermal throttling memory */
kfree(tt->restriction);
tt->restriction = NULL;
kfree(tt->transaction);
tt->transaction = NULL;
}
}
EXPORT_SYMBOL(iwl_tt_exit);
/* initialize to default */
void iwl_power_initialize(struct iwl_priv *priv)
{
u16 lctl = iwl_pcie_link_ctl(priv);
priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
priv->power_data.debug_sleep_level_override = -1;
memset(&priv->power_data.sleep_cmd, 0,
sizeof(priv->power_data.sleep_cmd));
}
EXPORT_SYMBOL(iwl_power_initialize);
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