cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/intel/iwlwifi/dvm/power.c

/******************************************************************************
 *
 * Copyright(c) 2007 - 2014 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 <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *****************************************************************************/


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <net/mac80211.h>
#include "iwl-io.h"
#include "iwl-debug.h"
#include "iwl-trans.h"
#include "iwl-modparams.h"
#include "dev.h"
#include "agn.h"
#include "commands.h"
#include "power.h"


static bool force_cam = true;
module_param(force_cam, bool, 0644);
MODULE_PARM_DESC(force_cam, "force continuously aware mode (no power saving at all)");

/*
 * 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.
 */

/*
 * 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;	/* number of skip 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 ASLP (IWL_POWER_POWER_SAVE_ENA_MSK | \
                IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
                IWL_POWER_ADVANCE_PM_ENA_MSK)

#define ASLP_TOUT(T) cpu_to_le32(T)

#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 */
/* DTIM 0 - 2 */

static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
	{{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 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 */
/* DTIM 3 - 10 */

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, 6, 10, 10)}, 2}
};

/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
/* DTIM 11 - */

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}
};

/* advance power management */
/* DTIM 0 - 2 */

static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
};


/* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
/* DTIM 3 - 10 */

static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
};

/* for DTIM period > IWL_DTIM_RANGE_1_MAX */
/* DTIM 11 - */

static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
	{{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
		SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
};


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[IWL_POWER_VEC_SIZE] = { 0 }; int i; u8 skip; u32 slp_itrvl; if (priv->lib->adv_pm) { table = apm_range_2; if (period <= IWL_DTIM_RANGE_1_MAX) table = apm_range_1; if (period <= IWL_DTIM_RANGE_0_MAX) table = apm_range_0; } else { table = range_2; if (period <= IWL_DTIM_RANGE_1_MAX) table = range_1; if (period <= IWL_DTIM_RANGE_0_MAX) table = range_0; } if (WARN_ON(lvl < 0 || lvl >= IWL_POWER_NUM)) memset(cmd, 0, sizeof(*cmd)); else *cmd = table[lvl].cmd; if (period == 0) { skip = 0; period = 1; for (i = 0; i < IWL_POWER_VEC_SIZE; i++) max_sleep[i] = 1; } else { skip = table[lvl].no_dtim; for (i = 0; i < IWL_POWER_VEC_SIZE; i++) max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]); max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1; } slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]); /* figure out the listen interval based on dtim period and skip */ if (slp_itrvl == 0xFF) cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] = cpu_to_le32(period * (skip + 1)); slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]); if (slp_itrvl > period) cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] = cpu_to_le32((slp_itrvl / period) * period); if (skip) cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK; else cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK; if (priv->cfg->base_params->shadow_reg_enable) cmd->flags |= IWL_POWER_SHADOW_REG_ENA; else cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA; if (iwl_advanced_bt_coexist(priv)) { if (!priv->lib->bt_params->bt_sco_disable) cmd->flags |= IWL_POWER_BT_SCO_ENA; else cmd->flags &= ~IWL_POWER_BT_SCO_ENA; } slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]); if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL) cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] = cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL); /* enforce max sleep interval */ for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) { if (le32_to_cpu(cmd->sleep_interval[i]) > (max_sleep[i] * period)) cmd->sleep_interval[i] = cpu_to_le32(max_sleep[i] * period); if (i != (IWL_POWER_VEC_SIZE - 1)) { if (le32_to_cpu(cmd->sleep_interval[i]) > le32_to_cpu(cmd->sleep_interval[i+1])) cmd->sleep_interval[i] = cmd->sleep_interval[i+1]; } } if (priv->power_data.bus_pm) cmd->flags |= IWL_POWER_PCI_PM_MSK; else cmd->flags &= ~IWL_POWER_PCI_PM_MSK; IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n", skip, period); /* The power level here is 0-4 (used as array index), but user expects to see 1-5 (according to spec). */ IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1); }

Contributors

PersonTokensPropCommitsCommitProp
Wey-Yi Guy38266.20%746.67%
Johannes Berg18532.06%426.67%
Emmanuel Grumbach40.69%16.67%
Stanislaw Gruszka30.52%16.67%
Don Fry20.35%16.67%
Amit Beka10.17%16.67%
Total577100.00%15100.00%


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.bus_pm) cmd->flags |= IWL_POWER_PCI_PM_MSK; IWL_DEBUG_POWER(priv, "Sleep command for CAM\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg2958.00%133.33%
Mohamed Abbas2040.00%133.33%
Wey-Yi Guy12.00%133.33%
Total50100.00%3100.00%


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_dvm_send_cmd_pdu(priv, POWER_TABLE_CMD, 0, sizeof(struct iwl_powertable_cmd), cmd); }

Contributors

PersonTokensPropCommitsCommitProp
Mohamed Abbas9367.88%114.29%
Johannes Berg3223.36%228.57%
Tomas Winkler85.84%114.29%
Emmanuel Grumbach42.92%342.86%
Total137100.00%7100.00%


static void iwl_power_build_cmd(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd) { bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS; int dtimper; if (force_cam) { iwl_power_sleep_cam_cmd(priv, cmd); return; } dtimper = priv->hw->conf.ps_dtim_period ?: 1; if (priv->wowlan) iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, dtimper); else if (!priv->lib->no_idle_support && priv->hw->conf.flags & IEEE80211_CONF_IDLE) iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20); else if (iwl_tt_is_low_power_state(priv)) { /* in thermal throttling low power state */ iwl_static_sleep_cmd(priv, cmd, iwl_tt_current_power_mode(priv), 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 { /* Note that the user parameter is 1-5 (according to spec), but we pass 0-4 because it acts as an array index. */ if (iwlwifi_mod_params.power_level > IWL_POWER_INDEX_1 && iwlwifi_mod_params.power_level <= IWL_POWER_NUM) iwl_static_sleep_cmd(priv, cmd, iwlwifi_mod_params.power_level - 1, dtimper); else iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_1, dtimper); } }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg13361.57%1047.62%
Wey-Yi Guy4219.44%523.81%
Andrew Lutomirski146.48%14.76%
Mohamed Abbas136.02%14.76%
Stanislaw Gruszka83.70%14.76%
Amit Beka41.85%14.76%
Emmanuel Grumbach10.46%14.76%
Don Fry10.46%14.76%
Total216100.00%21100.00%


int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd, bool force) { int ret; bool update_chains; lockdep_assert_held(&priv->mutex); /* 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 (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force) return 0; if (!iwl_is_ready_rf(priv)) return -EIO; /* scan complete use sleep_power_next, need to be updated */ memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd)); if (test_bit(STATUS_SCANNING, &priv->status) && !force) { IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n"); return 0; } if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK) iwl_dvm_set_pmi(priv, true); ret = iwl_set_power(priv, cmd); if (!ret) { if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)) iwl_dvm_set_pmi(priv, false); if (update_chains) iwl_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\n", ret); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Stanislaw Gruszka11547.92%19.09%
Johannes Berg4317.92%218.18%
Mohamed Abbas4317.92%218.18%
Tomas Winkler156.25%218.18%
Wey-Yi Guy156.25%19.09%
Don Fry83.33%218.18%
Emmanuel Grumbach10.42%19.09%
Total240100.00%11100.00%


int iwl_power_update_mode(struct iwl_priv *priv, bool force) { struct iwl_powertable_cmd cmd; iwl_power_build_cmd(priv, &cmd); return iwl_power_set_mode(priv, &cmd, force); }

Contributors

PersonTokensPropCommitsCommitProp
Stanislaw Gruszka36100.00%1100.00%
Total36100.00%1100.00%

/* initialize to default */
void iwl_power_initialize(struct iwl_priv *priv) { priv->power_data.bus_pm = priv->trans->pm_support; priv->power_data.debug_sleep_level_override = -1; memset(&priv->power_data.sleep_cmd, 0, sizeof(priv->power_data.sleep_cmd)); }

Contributors

PersonTokensPropCommitsCommitProp
Johannes Berg3057.69%228.57%
Mohamed Abbas1630.77%114.29%
Emmanuel Grumbach47.69%228.57%
Don Fry11.92%114.29%
Wey-Yi Guy11.92%114.29%
Total52100.00%7100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Wey-Yi Guy106141.76%1426.92%
Mohamed Abbas70727.82%23.85%
Johannes Berg51520.27%1528.85%
Stanislaw Gruszka1626.38%23.85%
Andrew Lutomirski341.34%11.92%
Tomas Winkler230.91%23.85%
Emmanuel Grumbach190.75%1019.23%
Don Fry120.47%47.69%
Amit Beka50.20%11.92%
Tejun Heo30.12%11.92%
Total2541100.00%52100.00%
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