linux/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
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   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 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  10 * Copyright(c) 2017           Intel Deutschland GmbH
  11 * Copyright(c) 2018           Intel Corporation
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of version 2 of the GNU General Public License as
  15 * published by the Free Software Foundation.
  16 *
  17 * This program is distributed in the hope that it will be useful, but
  18 * WITHOUT ANY WARRANTY; without even the implied warranty of
  19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20 * General Public License for more details.
  21 *
  22 * The full GNU General Public License is included in this distribution
  23 * in the file called COPYING.
  24 *
  25 * Contact Information:
  26 *  Intel Linux Wireless <linuxwifi@intel.com>
  27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28 *
  29 * BSD LICENSE
  30 *
  31 * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
  33 * Copyright(c) 2018           Intel Corporation
  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 <net/mac80211.h>
  65#include "fw-api.h"
  66#include "mvm.h"
  67
  68/* Maps the driver specific channel width definition to the fw values */
  69u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
  70{
  71        switch (chandef->width) {
  72        case NL80211_CHAN_WIDTH_20_NOHT:
  73        case NL80211_CHAN_WIDTH_20:
  74                return PHY_VHT_CHANNEL_MODE20;
  75        case NL80211_CHAN_WIDTH_40:
  76                return PHY_VHT_CHANNEL_MODE40;
  77        case NL80211_CHAN_WIDTH_80:
  78                return PHY_VHT_CHANNEL_MODE80;
  79        case NL80211_CHAN_WIDTH_160:
  80                return PHY_VHT_CHANNEL_MODE160;
  81        default:
  82                WARN(1, "Invalid channel width=%u", chandef->width);
  83                return PHY_VHT_CHANNEL_MODE20;
  84        }
  85}
  86
  87/*
  88 * Maps the driver specific control channel position (relative to the center
  89 * freq) definitions to the the fw values
  90 */
  91u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
  92{
  93        switch (chandef->chan->center_freq - chandef->center_freq1) {
  94        case -70:
  95                return PHY_VHT_CTRL_POS_4_BELOW;
  96        case -50:
  97                return PHY_VHT_CTRL_POS_3_BELOW;
  98        case -30:
  99                return PHY_VHT_CTRL_POS_2_BELOW;
 100        case -10:
 101                return PHY_VHT_CTRL_POS_1_BELOW;
 102        case  10:
 103                return PHY_VHT_CTRL_POS_1_ABOVE;
 104        case  30:
 105                return PHY_VHT_CTRL_POS_2_ABOVE;
 106        case  50:
 107                return PHY_VHT_CTRL_POS_3_ABOVE;
 108        case  70:
 109                return PHY_VHT_CTRL_POS_4_ABOVE;
 110        default:
 111                WARN(1, "Invalid channel definition");
 112        case 0:
 113                /*
 114                 * The FW is expected to check the control channel position only
 115                 * when in HT/VHT and the channel width is not 20MHz. Return
 116                 * this value as the default one.
 117                 */
 118                return PHY_VHT_CTRL_POS_1_BELOW;
 119        }
 120}
 121
 122/*
 123 * Construct the generic fields of the PHY context command
 124 */
 125static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
 126                                     struct iwl_phy_context_cmd *cmd,
 127                                     u32 action, u32 apply_time)
 128{
 129        memset(cmd, 0, sizeof(struct iwl_phy_context_cmd));
 130
 131        cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
 132                                                            ctxt->color));
 133        cmd->action = cpu_to_le32(action);
 134        cmd->apply_time = cpu_to_le32(apply_time);
 135}
 136
 137/*
 138 * Add the phy configuration to the PHY context command
 139 */
 140static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
 141                                      struct iwl_phy_context_cmd *cmd,
 142                                      struct cfg80211_chan_def *chandef,
 143                                      u8 chains_static, u8 chains_dynamic)
 144{
 145        u8 active_cnt, idle_cnt;
 146
 147        /* Set the channel info data */
 148        cmd->ci.band = (chandef->chan->band == NL80211_BAND_2GHZ ?
 149              PHY_BAND_24 : PHY_BAND_5);
 150
 151        cmd->ci.channel = chandef->chan->hw_value;
 152        cmd->ci.width = iwl_mvm_get_channel_width(chandef);
 153        cmd->ci.ctrl_pos = iwl_mvm_get_ctrl_pos(chandef);
 154
 155        /* Set rx the chains */
 156        idle_cnt = chains_static;
 157        active_cnt = chains_dynamic;
 158
 159        /* In scenarios where we only ever use a single-stream rates,
 160         * i.e. legacy 11b/g/a associations, single-stream APs or even
 161         * static SMPS, enable both chains to get diversity, improving
 162         * the case where we're far enough from the AP that attenuation
 163         * between the two antennas is sufficiently different to impact
 164         * performance.
 165         */
 166        if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) {
 167                idle_cnt = 2;
 168                active_cnt = 2;
 169        }
 170
 171        cmd->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
 172                                        PHY_RX_CHAIN_VALID_POS);
 173        cmd->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 174        cmd->rxchain_info |= cpu_to_le32(active_cnt <<
 175                                         PHY_RX_CHAIN_MIMO_CNT_POS);
 176#ifdef CONFIG_IWLWIFI_DEBUGFS
 177        if (unlikely(mvm->dbgfs_rx_phyinfo))
 178                cmd->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
 179#endif
 180
 181        cmd->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 182}
 183
 184/*
 185 * Send a command to apply the current phy configuration. The command is send
 186 * only if something in the configuration changed: in case that this is the
 187 * first time that the phy configuration is applied or in case that the phy
 188 * configuration changed from the previous apply.
 189 */
 190static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 191                                  struct iwl_mvm_phy_ctxt *ctxt,
 192                                  struct cfg80211_chan_def *chandef,
 193                                  u8 chains_static, u8 chains_dynamic,
 194                                  u32 action, u32 apply_time)
 195{
 196        struct iwl_phy_context_cmd cmd;
 197        int ret;
 198
 199        /* Set the command header fields */
 200        iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time);
 201
 202        /* Set the command data */
 203        iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef,
 204                                  chains_static, chains_dynamic);
 205
 206        ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0,
 207                                   sizeof(struct iwl_phy_context_cmd),
 208                                   &cmd);
 209        if (ret)
 210                IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 211        return ret;
 212}
 213
 214/*
 215 * Send a command to add a PHY context based on the current HW configuration.
 216 */
 217int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 218                         struct cfg80211_chan_def *chandef,
 219                         u8 chains_static, u8 chains_dynamic)
 220{
 221        WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
 222                ctxt->ref);
 223        lockdep_assert_held(&mvm->mutex);
 224
 225        ctxt->channel = chandef->chan;
 226
 227        return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 228                                      chains_static, chains_dynamic,
 229                                      FW_CTXT_ACTION_ADD, 0);
 230}
 231
 232/*
 233 * Update the number of references to the given PHY context. This is valid only
 234 * in case the PHY context was already created, i.e., its reference count > 0.
 235 */
 236void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 237{
 238        lockdep_assert_held(&mvm->mutex);
 239        ctxt->ref++;
 240}
 241
 242/*
 243 * Send a command to modify the PHY context based on the current HW
 244 * configuration. Note that the function does not check that the configuration
 245 * changed.
 246 */
 247int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 248                             struct cfg80211_chan_def *chandef,
 249                             u8 chains_static, u8 chains_dynamic)
 250{
 251        enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;
 252
 253        lockdep_assert_held(&mvm->mutex);
 254
 255        if (fw_has_capa(&mvm->fw->ucode_capa,
 256                        IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
 257            ctxt->channel->band != chandef->chan->band) {
 258                int ret;
 259
 260                /* ... remove it here ...*/
 261                ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 262                                             chains_static, chains_dynamic,
 263                                             FW_CTXT_ACTION_REMOVE, 0);
 264                if (ret)
 265                        return ret;
 266
 267                /* ... and proceed to add it again */
 268                action = FW_CTXT_ACTION_ADD;
 269        }
 270
 271        ctxt->channel = chandef->chan;
 272        ctxt->width = chandef->width;
 273        return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 274                                      chains_static, chains_dynamic,
 275                                      action, 0);
 276}
 277
 278void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 279{
 280        lockdep_assert_held(&mvm->mutex);
 281
 282        if (WARN_ON_ONCE(!ctxt))
 283                return;
 284
 285        ctxt->ref--;
 286
 287        /*
 288         * Move unused phy's to a default channel. When the phy is moved the,
 289         * fw will cleanup immediate quiet bit if it was previously set,
 290         * otherwise we might not be able to reuse this phy.
 291         */
 292        if (ctxt->ref == 0) {
 293                struct ieee80211_channel *chan;
 294                struct cfg80211_chan_def chandef;
 295
 296                chan = &mvm->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels[0];
 297                cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 298                iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
 299        }
 300}
 301
 302static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
 303                                     struct ieee80211_vif *vif)
 304{
 305        unsigned long *data = _data;
 306        struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 307
 308        if (!mvmvif->phy_ctxt)
 309                return;
 310
 311        if (vif->type == NL80211_IFTYPE_STATION ||
 312            vif->type == NL80211_IFTYPE_AP)
 313                __set_bit(mvmvif->phy_ctxt->id, data);
 314}
 315
 316int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
 317{
 318        unsigned long phy_ctxt_counter = 0;
 319
 320        ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 321                                                   IEEE80211_IFACE_ITER_NORMAL,
 322                                                   iwl_mvm_binding_iterator,
 323                                                   &phy_ctxt_counter);
 324
 325        return hweight8(phy_ctxt_counter);
 326}
 327