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 */ 69 u8 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 */ 91 u8 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 /* fall through */ 113 case 0: 114 /* 115 * The FW is expected to check the control channel position only 116 * when in HT/VHT and the channel width is not 20MHz. Return 117 * this value as the default one. 118 */ 119 return PHY_VHT_CTRL_POS_1_BELOW; 120 } 121 } 122 123 /* 124 * Construct the generic fields of the PHY context command 125 */ 126 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt, 127 struct iwl_phy_context_cmd *cmd, 128 u32 action, u32 apply_time) 129 { 130 memset(cmd, 0, sizeof(struct iwl_phy_context_cmd)); 131 132 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id, 133 ctxt->color)); 134 cmd->action = cpu_to_le32(action); 135 cmd->apply_time = cpu_to_le32(apply_time); 136 } 137 138 /* 139 * Add the phy configuration to the PHY context command 140 */ 141 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm, 142 struct iwl_phy_context_cmd *cmd, 143 struct cfg80211_chan_def *chandef, 144 u8 chains_static, u8 chains_dynamic) 145 { 146 u8 active_cnt, idle_cnt; 147 struct iwl_phy_context_cmd_tail *tail = 148 iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci); 149 150 /* Set the channel info data */ 151 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef); 152 153 /* Set rx the chains */ 154 idle_cnt = chains_static; 155 active_cnt = chains_dynamic; 156 157 /* In scenarios where we only ever use a single-stream rates, 158 * i.e. legacy 11b/g/a associations, single-stream APs or even 159 * static SMPS, enable both chains to get diversity, improving 160 * the case where we're far enough from the AP that attenuation 161 * between the two antennas is sufficiently different to impact 162 * performance. 163 */ 164 if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm)) { 165 idle_cnt = 2; 166 active_cnt = 2; 167 } 168 169 tail->rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) << 170 PHY_RX_CHAIN_VALID_POS); 171 tail->rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS); 172 tail->rxchain_info |= cpu_to_le32(active_cnt << 173 PHY_RX_CHAIN_MIMO_CNT_POS); 174 #ifdef CONFIG_IWLWIFI_DEBUGFS 175 if (unlikely(mvm->dbgfs_rx_phyinfo)) 176 tail->rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo); 177 #endif 178 179 tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm)); 180 } 181 182 /* 183 * Send a command to apply the current phy configuration. The command is send 184 * only if something in the configuration changed: in case that this is the 185 * first time that the phy configuration is applied or in case that the phy 186 * configuration changed from the previous apply. 187 */ 188 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm, 189 struct iwl_mvm_phy_ctxt *ctxt, 190 struct cfg80211_chan_def *chandef, 191 u8 chains_static, u8 chains_dynamic, 192 u32 action, u32 apply_time) 193 { 194 struct iwl_phy_context_cmd cmd; 195 int ret; 196 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm); 197 198 /* Set the command header fields */ 199 iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action, apply_time); 200 201 /* Set the command data */ 202 iwl_mvm_phy_ctxt_cmd_data(mvm, &cmd, chandef, 203 chains_static, chains_dynamic); 204 205 ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 0, len, &cmd); 206 if (ret) 207 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret); 208 return ret; 209 } 210 211 /* 212 * Send a command to add a PHY context based on the current HW configuration. 213 */ 214 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt, 215 struct cfg80211_chan_def *chandef, 216 u8 chains_static, u8 chains_dynamic) 217 { 218 WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) && 219 ctxt->ref); 220 lockdep_assert_held(&mvm->mutex); 221 222 ctxt->channel = chandef->chan; 223 224 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 225 chains_static, chains_dynamic, 226 FW_CTXT_ACTION_ADD, 0); 227 } 228 229 /* 230 * Update the number of references to the given PHY context. This is valid only 231 * in case the PHY context was already created, i.e., its reference count > 0. 232 */ 233 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt) 234 { 235 lockdep_assert_held(&mvm->mutex); 236 ctxt->ref++; 237 } 238 239 /* 240 * Send a command to modify the PHY context based on the current HW 241 * configuration. Note that the function does not check that the configuration 242 * changed. 243 */ 244 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt, 245 struct cfg80211_chan_def *chandef, 246 u8 chains_static, u8 chains_dynamic) 247 { 248 enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY; 249 250 lockdep_assert_held(&mvm->mutex); 251 252 if (fw_has_capa(&mvm->fw->ucode_capa, 253 IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) && 254 ctxt->channel->band != chandef->chan->band) { 255 int ret; 256 257 /* ... remove it here ...*/ 258 ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 259 chains_static, chains_dynamic, 260 FW_CTXT_ACTION_REMOVE, 0); 261 if (ret) 262 return ret; 263 264 /* ... and proceed to add it again */ 265 action = FW_CTXT_ACTION_ADD; 266 } 267 268 ctxt->channel = chandef->chan; 269 ctxt->width = chandef->width; 270 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 271 chains_static, chains_dynamic, 272 action, 0); 273 } 274 275 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt) 276 { 277 lockdep_assert_held(&mvm->mutex); 278 279 if (WARN_ON_ONCE(!ctxt)) 280 return; 281 282 ctxt->ref--; 283 284 /* 285 * Move unused phy's to a default channel. When the phy is moved the, 286 * fw will cleanup immediate quiet bit if it was previously set, 287 * otherwise we might not be able to reuse this phy. 288 */ 289 if (ctxt->ref == 0) { 290 struct ieee80211_channel *chan; 291 struct cfg80211_chan_def chandef; 292 struct ieee80211_supported_band *sband = NULL; 293 enum nl80211_band band = NL80211_BAND_2GHZ; 294 295 while (!sband && band < NUM_NL80211_BANDS) 296 sband = mvm->hw->wiphy->bands[band++]; 297 298 if (WARN_ON(!sband)) 299 return; 300 301 chan = &sband->channels[0]; 302 303 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT); 304 iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1); 305 } 306 } 307 308 static void iwl_mvm_binding_iterator(void *_data, u8 *mac, 309 struct ieee80211_vif *vif) 310 { 311 unsigned long *data = _data; 312 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 313 314 if (!mvmvif->phy_ctxt) 315 return; 316 317 if (vif->type == NL80211_IFTYPE_STATION || 318 vif->type == NL80211_IFTYPE_AP) 319 __set_bit(mvmvif->phy_ctxt->id, data); 320 } 321 322 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm) 323 { 324 unsigned long phy_ctxt_counter = 0; 325 326 ieee80211_iterate_active_interfaces_atomic(mvm->hw, 327 IEEE80211_IFACE_ITER_NORMAL, 328 iwl_mvm_binding_iterator, 329 &phy_ctxt_counter); 330 331 return hweight8(phy_ctxt_counter); 332 } 333