Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/contrib/dev/iwlwifi/mvm/phy-ctxt.c
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1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Copyright (C) 2012-2014, 2018-2022 Intel Corporation 4 * Copyright (C) 2013-2014 Intel Mobile Communications GmbH 5 * Copyright (C) 2017 Intel Deutschland GmbH 6 */ 7 #include <net/mac80211.h> 8 #include "fw-api.h" 9 #include "mvm.h" 10 11 /* Maps the driver specific channel width definition to the fw values */ 12 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef) 13 { 14 switch (chandef->width) { 15 case NL80211_CHAN_WIDTH_20_NOHT: 16 case NL80211_CHAN_WIDTH_20: 17 return PHY_VHT_CHANNEL_MODE20; 18 case NL80211_CHAN_WIDTH_40: 19 return PHY_VHT_CHANNEL_MODE40; 20 case NL80211_CHAN_WIDTH_80: 21 return PHY_VHT_CHANNEL_MODE80; 22 case NL80211_CHAN_WIDTH_160: 23 return PHY_VHT_CHANNEL_MODE160; 24 default: 25 WARN(1, "Invalid channel width=%u", chandef->width); 26 return PHY_VHT_CHANNEL_MODE20; 27 } 28 } 29 30 /* 31 * Maps the driver specific control channel position (relative to the center 32 * freq) definitions to the the fw values 33 */ 34 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef) 35 { 36 switch (chandef->chan->center_freq - chandef->center_freq1) { 37 case -70: 38 return PHY_VHT_CTRL_POS_4_BELOW; 39 case -50: 40 return PHY_VHT_CTRL_POS_3_BELOW; 41 case -30: 42 return PHY_VHT_CTRL_POS_2_BELOW; 43 case -10: 44 return PHY_VHT_CTRL_POS_1_BELOW; 45 case 10: 46 return PHY_VHT_CTRL_POS_1_ABOVE; 47 case 30: 48 return PHY_VHT_CTRL_POS_2_ABOVE; 49 case 50: 50 return PHY_VHT_CTRL_POS_3_ABOVE; 51 case 70: 52 return PHY_VHT_CTRL_POS_4_ABOVE; 53 default: 54 WARN(1, "Invalid channel definition"); 55 fallthrough; 56 case 0: 57 /* 58 * The FW is expected to check the control channel position only 59 * when in HT/VHT and the channel width is not 20MHz. Return 60 * this value as the default one. 61 */ 62 return PHY_VHT_CTRL_POS_1_BELOW; 63 } 64 } 65 66 /* 67 * Construct the generic fields of the PHY context command 68 */ 69 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt, 70 struct iwl_phy_context_cmd *cmd, 71 u32 action) 72 { 73 cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id, 74 ctxt->color)); 75 cmd->action = cpu_to_le32(action); 76 } 77 78 static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm, 79 struct iwl_mvm_phy_ctxt *ctxt, 80 __le32 *rxchain_info, 81 u8 chains_static, 82 u8 chains_dynamic) 83 { 84 u8 active_cnt, idle_cnt; 85 86 /* Set rx the chains */ 87 idle_cnt = chains_static; 88 active_cnt = chains_dynamic; 89 90 /* In scenarios where we only ever use a single-stream rates, 91 * i.e. legacy 11b/g/a associations, single-stream APs or even 92 * static SMPS, enable both chains to get diversity, improving 93 * the case where we're far enough from the AP that attenuation 94 * between the two antennas is sufficiently different to impact 95 * performance. 96 */ 97 if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) { 98 idle_cnt = 2; 99 active_cnt = 2; 100 } 101 102 /* 103 * If the firmware requested it, then we know that it supports 104 * getting zero for the values to indicate "use one, but pick 105 * which one yourself", which means it can dynamically pick one 106 * that e.g. has better RSSI. 107 */ 108 if (mvm->fw_static_smps_request && active_cnt == 1 && idle_cnt == 1) { 109 idle_cnt = 0; 110 active_cnt = 0; 111 } 112 113 *rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) << 114 PHY_RX_CHAIN_VALID_POS); 115 *rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS); 116 *rxchain_info |= cpu_to_le32(active_cnt << 117 PHY_RX_CHAIN_MIMO_CNT_POS); 118 #ifdef CONFIG_IWLWIFI_DEBUGFS 119 if (unlikely(mvm->dbgfs_rx_phyinfo)) 120 *rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo); 121 #endif 122 } 123 124 /* 125 * Add the phy configuration to the PHY context command 126 */ 127 static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm, 128 struct iwl_mvm_phy_ctxt *ctxt, 129 struct iwl_phy_context_cmd_v1 *cmd, 130 struct cfg80211_chan_def *chandef, 131 u8 chains_static, u8 chains_dynamic) 132 { 133 struct iwl_phy_context_cmd_tail *tail = 134 iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci); 135 136 /* Set the channel info data */ 137 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef); 138 139 iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info, 140 chains_static, chains_dynamic); 141 142 tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm)); 143 } 144 145 /* 146 * Add the phy configuration to the PHY context command 147 */ 148 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm, 149 struct iwl_mvm_phy_ctxt *ctxt, 150 struct iwl_phy_context_cmd *cmd, 151 struct cfg80211_chan_def *chandef, 152 u8 chains_static, u8 chains_dynamic) 153 { 154 cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm->fw, 155 chandef->chan->band)); 156 157 /* Set the channel info data */ 158 iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef); 159 160 /* we only support RLC command version 2 */ 161 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2) 162 iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info, 163 chains_static, chains_dynamic); 164 } 165 166 static int iwl_mvm_phy_send_rlc(struct iwl_mvm *mvm, 167 struct iwl_mvm_phy_ctxt *ctxt, 168 u8 chains_static, u8 chains_dynamic) 169 { 170 struct iwl_rlc_config_cmd cmd = { 171 .phy_id = cpu_to_le32(ctxt->id), 172 }; 173 174 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) < 2) 175 return 0; 176 177 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_DRIVER_FORCE != 178 PHY_RX_CHAIN_DRIVER_FORCE_MSK); 179 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_VALID != 180 PHY_RX_CHAIN_VALID_MSK); 181 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE != 182 PHY_RX_CHAIN_FORCE_SEL_MSK); 183 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_FORCE_MIMO != 184 PHY_RX_CHAIN_FORCE_MIMO_SEL_MSK); 185 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_COUNT != PHY_RX_CHAIN_CNT_MSK); 186 BUILD_BUG_ON(IWL_RLC_CHAIN_INFO_MIMO_COUNT != 187 PHY_RX_CHAIN_MIMO_CNT_MSK); 188 189 iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd.rlc.rx_chain_info, 190 chains_static, chains_dynamic); 191 192 return iwl_mvm_send_cmd_pdu(mvm, iwl_cmd_id(RLC_CONFIG_CMD, 193 DATA_PATH_GROUP, 2), 194 0, sizeof(cmd), &cmd); 195 } 196 197 /* 198 * Send a command to apply the current phy configuration. The command is send 199 * only if something in the configuration changed: in case that this is the 200 * first time that the phy configuration is applied or in case that the phy 201 * configuration changed from the previous apply. 202 */ 203 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm, 204 struct iwl_mvm_phy_ctxt *ctxt, 205 struct cfg80211_chan_def *chandef, 206 u8 chains_static, u8 chains_dynamic, 207 u32 action) 208 { 209 int ret; 210 int ver = iwl_fw_lookup_cmd_ver(mvm->fw, PHY_CONTEXT_CMD, 1); 211 212 if (ver == 3 || ver == 4) { 213 struct iwl_phy_context_cmd cmd = {}; 214 215 /* Set the command header fields */ 216 iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action); 217 218 /* Set the command data */ 219 iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef, 220 chains_static, 221 chains_dynamic); 222 223 ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 224 0, sizeof(cmd), &cmd); 225 } else if (ver < 3) { 226 struct iwl_phy_context_cmd_v1 cmd = {}; 227 u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm); 228 229 /* Set the command header fields */ 230 iwl_mvm_phy_ctxt_cmd_hdr(ctxt, 231 (struct iwl_phy_context_cmd *)&cmd, 232 action); 233 234 /* Set the command data */ 235 iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef, 236 chains_static, 237 chains_dynamic); 238 ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD, 239 0, len, &cmd); 240 } else { 241 IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver); 242 return -EOPNOTSUPP; 243 } 244 245 246 if (ret) { 247 IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret); 248 return ret; 249 } 250 251 if (action != FW_CTXT_ACTION_REMOVE) 252 return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static, 253 chains_dynamic); 254 255 return 0; 256 } 257 258 /* 259 * Send a command to add a PHY context based on the current HW configuration. 260 */ 261 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt, 262 struct cfg80211_chan_def *chandef, 263 u8 chains_static, u8 chains_dynamic) 264 { 265 WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) && 266 ctxt->ref); 267 lockdep_assert_held(&mvm->mutex); 268 269 ctxt->channel = chandef->chan; 270 ctxt->width = chandef->width; 271 ctxt->center_freq1 = chandef->center_freq1; 272 273 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 274 chains_static, chains_dynamic, 275 FW_CTXT_ACTION_ADD); 276 } 277 278 /* 279 * Update the number of references to the given PHY context. This is valid only 280 * in case the PHY context was already created, i.e., its reference count > 0. 281 */ 282 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt) 283 { 284 lockdep_assert_held(&mvm->mutex); 285 ctxt->ref++; 286 } 287 288 /* 289 * Send a command to modify the PHY context based on the current HW 290 * configuration. Note that the function does not check that the configuration 291 * changed. 292 */ 293 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt, 294 struct cfg80211_chan_def *chandef, 295 u8 chains_static, u8 chains_dynamic) 296 { 297 enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY; 298 299 lockdep_assert_held(&mvm->mutex); 300 301 if (iwl_fw_lookup_cmd_ver(mvm->fw, WIDE_ID(DATA_PATH_GROUP, RLC_CONFIG_CMD), 0) >= 2 && 302 ctxt->channel == chandef->chan && 303 ctxt->width == chandef->width && 304 ctxt->center_freq1 == chandef->center_freq1) 305 return iwl_mvm_phy_send_rlc(mvm, ctxt, chains_static, 306 chains_dynamic); 307 308 if (fw_has_capa(&mvm->fw->ucode_capa, 309 IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) && 310 ctxt->channel->band != chandef->chan->band) { 311 int ret; 312 313 /* ... remove it here ...*/ 314 ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 315 chains_static, chains_dynamic, 316 FW_CTXT_ACTION_REMOVE); 317 if (ret) 318 return ret; 319 320 /* ... and proceed to add it again */ 321 action = FW_CTXT_ACTION_ADD; 322 } 323 324 ctxt->channel = chandef->chan; 325 ctxt->width = chandef->width; 326 ctxt->center_freq1 = chandef->center_freq1; 327 328 return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef, 329 chains_static, chains_dynamic, 330 action); 331 } 332 333 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt) 334 { 335 lockdep_assert_held(&mvm->mutex); 336 337 if (WARN_ON_ONCE(!ctxt)) 338 return; 339 340 ctxt->ref--; 341 342 /* 343 * Move unused phy's to a default channel. When the phy is moved the, 344 * fw will cleanup immediate quiet bit if it was previously set, 345 * otherwise we might not be able to reuse this phy. 346 */ 347 if (ctxt->ref == 0) { 348 struct ieee80211_channel *chan = NULL; 349 struct cfg80211_chan_def chandef; 350 struct ieee80211_supported_band *sband; 351 enum nl80211_band band; 352 int channel; 353 354 for (band = NL80211_BAND_2GHZ; band < NUM_NL80211_BANDS; band++) { 355 sband = mvm->hw->wiphy->bands[band]; 356 357 if (!sband) 358 continue; 359 360 for (channel = 0; channel < sband->n_channels; channel++) 361 if (!(sband->channels[channel].flags & 362 IEEE80211_CHAN_DISABLED)) { 363 chan = &sband->channels[channel]; 364 break; 365 } 366 367 if (chan) 368 break; 369 } 370 371 if (WARN_ON(!chan)) 372 return; 373 374 cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT); 375 iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1); 376 } 377 } 378 379 static void iwl_mvm_binding_iterator(void *_data, u8 *mac, 380 struct ieee80211_vif *vif) 381 { 382 unsigned long *data = _data; 383 struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif); 384 385 if (!mvmvif->phy_ctxt) 386 return; 387 388 if (vif->type == NL80211_IFTYPE_STATION || 389 vif->type == NL80211_IFTYPE_AP) 390 __set_bit(mvmvif->phy_ctxt->id, data); 391 } 392 393 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm) 394 { 395 unsigned long phy_ctxt_counter = 0; 396 397 ieee80211_iterate_active_interfaces_atomic(mvm->hw, 398 IEEE80211_IFACE_ITER_NORMAL, 399 iwl_mvm_binding_iterator, 400 &phy_ctxt_counter); 401 402 return hweight8(phy_ctxt_counter); 403 }
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