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

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63
  64 #include <linux/kernel.h>
  65 #include <linux/module.h>
  66 #include <linux/slab.h>
  67 #include <linux/init.h>
  68
  69 #include <net/mac80211.h>
  70
  71 #include "iwl-debug.h"
  72 #include "mvm.h"
  73 #include "iwl-modparams.h"
  74 #include "fw-api-power.h"
  75
  76 #define POWER_KEEP_ALIVE_PERIOD_SEC    25
  77
  78 static void iwl_mvm_power_log(struct iwl_mvm *mvm,
  79                               struct iwl_powertable_cmd *cmd)
  80 {
  81         IWL_DEBUG_POWER(mvm,
  82                         "Sending power table command for power level %d, flags = 0x%X\n",
  83                         iwlmvm_mod_params.power_scheme,
  84                         le16_to_cpu(cmd->flags));
  85         IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n", cmd->keep_alive_seconds);
  86
  87         if (cmd->flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
  88                 IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
  89                                 le32_to_cpu(cmd->rx_data_timeout));
  90                 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
  91                                 le32_to_cpu(cmd->tx_data_timeout));
  92                 if (cmd->flags & cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK))
  93                         IWL_DEBUG_POWER(mvm, "DTIM periods to skip = %u\n",
  94                                         le32_to_cpu(cmd->skip_dtim_periods));
  95                 if (cmd->flags & cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK))
  96                         IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
  97                                         le32_to_cpu(cmd->lprx_rssi_threshold));
  98         }
  99 }
 100
 101 static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
 102                                     struct ieee80211_vif *vif,
 103                                     struct iwl_powertable_cmd *cmd)
 104 {
 105         struct ieee80211_hw *hw = mvm->hw;
 106         struct ieee80211_chanctx_conf *chanctx_conf;
 107         struct ieee80211_channel *chan;
 108         int dtimper, dtimper_msec;
 109         int keep_alive;
 110         bool radar_detect = false;
 111         struct iwl_mvm_vif *mvmvif __maybe_unused =
 112                 iwl_mvm_vif_from_mac80211(vif);
 113
 114         /*
 115          * Regardless of power management state the driver must set
 116          * keep alive period. FW will use it for sending keep alive NDPs
 117          * immediately after association.
 118          */
 119         cmd->keep_alive_seconds = POWER_KEEP_ALIVE_PERIOD_SEC;
 120
 121         if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM)
 122                 return;
 123
 124         cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
 125         if (!vif->bss_conf.assoc)
 126                 cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
 127
 128 #ifdef CONFIG_IWLWIFI_DEBUGFS
 129         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_DISABLE_POWER_OFF &&
 130             mvmvif->dbgfs_pm.disable_power_off)
 131                 cmd->flags &= cpu_to_le16(~POWER_FLAGS_POWER_SAVE_ENA_MSK);
 132 #endif
 133         if (!vif->bss_conf.ps)
 134                 return;
 135
 136         cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
 137
 138         if (vif->bss_conf.beacon_rate &&
 139             (vif->bss_conf.beacon_rate->bitrate == 10 ||
 140              vif->bss_conf.beacon_rate->bitrate == 60)) {
 141                 cmd->flags |= cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK);
 142                 cmd->lprx_rssi_threshold =
 143                         cpu_to_le32(POWER_LPRX_RSSI_THRESHOLD);
 144         }
 145
 146         dtimper = hw->conf.ps_dtim_period ?: 1;
 147
 148         /* Check if radar detection is required on current channel */
 149         rcu_read_lock();
 150         chanctx_conf = rcu_dereference(vif->chanctx_conf);
 151         WARN_ON(!chanctx_conf);
 152         if (chanctx_conf) {
 153                 chan = chanctx_conf->def.chan;
 154                 radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
 155         }
 156         rcu_read_unlock();
 157
 158         /* Check skip over DTIM conditions */
 159         if (!radar_detect && (dtimper <= 10) &&
 160             (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP ||
 161              mvm->cur_ucode == IWL_UCODE_WOWLAN)) {
 162                 cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 163                 cmd->skip_dtim_periods = cpu_to_le32(3);
 164         }
 165
 166         /* Check that keep alive period is at least 3 * DTIM */
 167         dtimper_msec = dtimper * vif->bss_conf.beacon_int;
 168         keep_alive = max_t(int, 3 * dtimper_msec,
 169                            MSEC_PER_SEC * cmd->keep_alive_seconds);
 170         keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
 171         cmd->keep_alive_seconds = keep_alive;
 172
 173         if (mvm->cur_ucode != IWL_UCODE_WOWLAN) {
 174                 cmd->rx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
 175                 cmd->tx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
 176         } else {
 177                 cmd->rx_data_timeout = cpu_to_le32(10 * USEC_PER_MSEC);
 178                 cmd->tx_data_timeout = cpu_to_le32(10 * USEC_PER_MSEC);
 179         }
 180
 181 #ifdef CONFIG_IWLWIFI_DEBUGFS
 182         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_KEEP_ALIVE)
 183                 cmd->keep_alive_seconds = mvmvif->dbgfs_pm.keep_alive_seconds;
 184         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_SKIP_OVER_DTIM) {
 185                 if (mvmvif->dbgfs_pm.skip_over_dtim)
 186                         cmd->flags |=
 187                                 cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 188                 else
 189                         cmd->flags &=
 190                                 cpu_to_le16(~POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 191         }
 192         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_RX_DATA_TIMEOUT)
 193                 cmd->rx_data_timeout =
 194                         cpu_to_le32(mvmvif->dbgfs_pm.rx_data_timeout);
 195         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_TX_DATA_TIMEOUT)
 196                 cmd->tx_data_timeout =
 197                         cpu_to_le32(mvmvif->dbgfs_pm.tx_data_timeout);
 198         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_SKIP_DTIM_PERIODS)
 199                 cmd->skip_dtim_periods =
 200                         cpu_to_le32(mvmvif->dbgfs_pm.skip_dtim_periods);
 201         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_LPRX_ENA) {
 202                 if (mvmvif->dbgfs_pm.lprx_ena)
 203                         cmd->flags |= cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK);
 204                 else
 205                         cmd->flags &= cpu_to_le16(~POWER_FLAGS_LPRX_ENA_MSK);
 206         }
 207         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_LPRX_RSSI_THRESHOLD)
 208                 cmd->lprx_rssi_threshold =
 209                         cpu_to_le32(mvmvif->dbgfs_pm.lprx_rssi_threshold);
 210 #endif /* CONFIG_IWLWIFI_DEBUGFS */
 211 }
 212
 213 static int iwl_mvm_power_legacy_update_mode(struct iwl_mvm *mvm,
 214                                             struct ieee80211_vif *vif)
 215 {
 216         int ret;
 217         bool ba_enable;
 218         struct iwl_powertable_cmd cmd = {};
 219
 220         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 221                 return 0;
 222
 223         /*
 224          * TODO: The following vif_count verification is temporary condition.
 225          * Avoid power mode update if more than one interface is currently
 226          * active. Remove this condition when FW will support power management
 227          * on multiple MACs.
 228          */
 229         IWL_DEBUG_POWER(mvm, "Currently %d interfaces active\n",
 230                         mvm->vif_count);
 231         if (mvm->vif_count > 1)
 232                 return 0;
 233
 234         iwl_mvm_power_build_cmd(mvm, vif, &cmd);
 235         iwl_mvm_power_log(mvm, &cmd);
 236
 237         ret = iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_SYNC,
 238                                    sizeof(cmd), &cmd);
 239         if (ret)
 240                 return ret;
 241
 242         ba_enable = !!(cmd.flags &
 243                        cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK));
 244
 245         return iwl_mvm_update_beacon_abort(mvm, vif, ba_enable);
 246 }
 247
 248 static int iwl_mvm_power_legacy_disable(struct iwl_mvm *mvm,
 249                                         struct ieee80211_vif *vif)
 250 {
 251         struct iwl_powertable_cmd cmd = {};
 252         struct iwl_mvm_vif *mvmvif __maybe_unused =
 253                 iwl_mvm_vif_from_mac80211(vif);
 254
 255         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 256                 return 0;
 257
 258         if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_CAM)
 259                 cmd.flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
 260
 261 #ifdef CONFIG_IWLWIFI_DEBUGFS
 262         if (mvmvif->dbgfs_pm.mask & MVM_DEBUGFS_PM_DISABLE_POWER_OFF &&
 263             mvmvif->dbgfs_pm.disable_power_off)
 264                 cmd.flags &= cpu_to_le16(~POWER_FLAGS_POWER_SAVE_ENA_MSK);
 265 #endif
 266         iwl_mvm_power_log(mvm, &cmd);
 267
 268         return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_ASYNC,
 269                                     sizeof(cmd), &cmd);
 270 }
 271
 272 #ifdef CONFIG_IWLWIFI_DEBUGFS
 273 static int iwl_mvm_power_legacy_dbgfs_read(struct iwl_mvm *mvm,
 274                                            struct ieee80211_vif *vif, char *buf,
 275                                            int bufsz)
 276 {
 277         struct iwl_powertable_cmd cmd = {};
 278         int pos = 0;
 279
 280         iwl_mvm_power_build_cmd(mvm, vif, &cmd);
 281
 282         pos += scnprintf(buf+pos, bufsz-pos, "disable_power_off = %d\n",
 283                          (cmd.flags &
 284                          cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK)) ?
 285                          0 : 1);
 286         pos += scnprintf(buf+pos, bufsz-pos, "skip_dtim_periods = %d\n",
 287                          le32_to_cpu(cmd.skip_dtim_periods));
 288         pos += scnprintf(buf+pos, bufsz-pos, "power_scheme = %d\n",
 289                          iwlmvm_mod_params.power_scheme);
 290         pos += scnprintf(buf+pos, bufsz-pos, "flags = 0x%x\n",
 291                          le16_to_cpu(cmd.flags));
 292         pos += scnprintf(buf+pos, bufsz-pos, "keep_alive = %d\n",
 293                          cmd.keep_alive_seconds);
 294
 295         if (cmd.flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
 296                 pos += scnprintf(buf+pos, bufsz-pos, "skip_over_dtim = %d\n",
 297                                  (cmd.flags &
 298                                  cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK)) ?
 299                                  1 : 0);
 300                 pos += scnprintf(buf+pos, bufsz-pos, "rx_data_timeout = %d\n",
 301                                  le32_to_cpu(cmd.rx_data_timeout));
 302                 pos += scnprintf(buf+pos, bufsz-pos, "tx_data_timeout = %d\n",
 303                                  le32_to_cpu(cmd.tx_data_timeout));
 304                 if (cmd.flags & cpu_to_le16(POWER_FLAGS_LPRX_ENA_MSK))
 305                         pos += scnprintf(buf+pos, bufsz-pos,
 306                                          "lprx_rssi_threshold = %d\n",
 307                                          le32_to_cpu(cmd.lprx_rssi_threshold));
 308         }
 309         return pos;
 310 }
 311 #endif
 312
 313 const struct iwl_mvm_power_ops pm_legacy_ops = {
 314         .power_update_mode = iwl_mvm_power_legacy_update_mode,
 315         .power_disable = iwl_mvm_power_legacy_disable,
 316 #ifdef CONFIG_IWLWIFI_DEBUGFS
 317         .power_dbgfs_read = iwl_mvm_power_legacy_dbgfs_read,
 318 #endif
 319 };