drivers/net/wireless/intel/iwlwifi/mvm/time-event.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  * Copyright(c) 2013 - 2015 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
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  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
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  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
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  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 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018 Intel Corporation
  35  * All rights reserved.
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  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  *
  41  *  * Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
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  44  *    notice, this list of conditions and the following disclaimer in
  45  *    the documentation and/or other materials provided with the
  46  *    distribution.
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  48  *    contributors may be used to endorse or promote products derived
  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  *****************************************************************************/
  64
  65 #include <linux/jiffies.h>
  66 #include <net/mac80211.h>
  67
  68 #include "fw/notif-wait.h"
  69 #include "iwl-trans.h"
  70 #include "fw-api.h"
  71 #include "time-event.h"
  72 #include "mvm.h"
  73 #include "iwl-io.h"
  74 #include "iwl-prph.h"
  75
  76 /*
  77  * For the high priority TE use a time event type that has similar priority to
  78  * the FW's action scan priority.
  79  */
  80 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  81 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  82
  83 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  84                            struct iwl_mvm_time_event_data *te_data)
  85 {
  86         lockdep_assert_held(&mvm->time_event_lock);
  87
  88         if (!te_data->vif)
  89                 return;
  90
  91         list_del(&te_data->list);
  92         te_data->running = false;
  93         te_data->uid = 0;
  94         te_data->id = TE_MAX;
  95         te_data->vif = NULL;
  96 }
  97
  98 void iwl_mvm_roc_done_wk(struct work_struct *wk)
  99 {
 100         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 101
 102         /*
 103          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 104          * This will cause the TX path to drop offchannel transmissions.
 105          * That would also be done by mac80211, but it is racy, in particular
 106          * in the case that the time event actually completed in the firmware
 107          * (which is handled in iwl_mvm_te_handle_notif).
 108          */
 109         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status))
 110                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 111         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
 112                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 113
 114         synchronize_net();
 115
 116         /*
 117          * Flush the offchannel queue -- this is called when the time
 118          * event finishes or is canceled, so that frames queued for it
 119          * won't get stuck on the queue and be transmitted in the next
 120          * time event.
 121          * We have to send the command asynchronously since this cannot
 122          * be under the mutex for locking reasons, but that's not an
 123          * issue as it will have to complete before the next command is
 124          * executed, and a new time event means a new command.
 125          */
 126         iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true, CMD_ASYNC);
 127
 128         /* Do the same for the P2P device queue (STA) */
 129         if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
 130                 struct iwl_mvm_vif *mvmvif;
 131
 132                 /*
 133                  * NB: access to this pointer would be racy, but the flush bit
 134                  * can only be set when we had a P2P-Device VIF, and we have a
 135                  * flush of this work in iwl_mvm_prepare_mac_removal() so it's
 136                  * not really racy.
 137                  */
 138
 139                 if (!WARN_ON(!mvm->p2p_device_vif)) {
 140                         mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
 141                         iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true,
 142                                           CMD_ASYNC);
 143                 }
 144         }
 145 }
 146
 147 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 148 {
 149         /*
 150          * Of course, our status bit is just as racy as mac80211, so in
 151          * addition, fire off the work struct which will drop all frames
 152          * from the hardware queues that made it through the race. First
 153          * it will of course synchronize the TX path to make sure that
 154          * any *new* TX will be rejected.
 155          */
 156         schedule_work(&mvm->roc_done_wk);
 157 }
 158
 159 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 160 {
 161         struct ieee80211_vif *csa_vif;
 162
 163         rcu_read_lock();
 164
 165         csa_vif = rcu_dereference(mvm->csa_vif);
 166         if (!csa_vif || !csa_vif->csa_active)
 167                 goto out_unlock;
 168
 169         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 170
 171         /*
 172          * CSA NoA is started but we still have beacons to
 173          * transmit on the current channel.
 174          * So we just do nothing here and the switch
 175          * will be performed on the last TBTT.
 176          */
 177         if (!ieee80211_csa_is_complete(csa_vif)) {
 178                 IWL_WARN(mvm, "CSA NOA started too early\n");
 179                 goto out_unlock;
 180         }
 181
 182         ieee80211_csa_finish(csa_vif);
 183
 184         rcu_read_unlock();
 185
 186         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 187
 188         return;
 189
 190 out_unlock:
 191         rcu_read_unlock();
 192 }
 193
 194 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 195                                         struct ieee80211_vif *vif,
 196                                         const char *errmsg)
 197 {
 198         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 199
 200         if (vif->type != NL80211_IFTYPE_STATION)
 201                 return false;
 202
 203         if (!mvmvif->csa_bcn_pending && vif->bss_conf.assoc &&
 204             vif->bss_conf.dtim_period)
 205                 return false;
 206         if (errmsg)
 207                 IWL_ERR(mvm, "%s\n", errmsg);
 208
 209         iwl_mvm_connection_loss(mvm, vif, errmsg);
 210         return true;
 211 }
 212
 213 static void
 214 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 215                              struct iwl_mvm_time_event_data *te_data,
 216                              struct iwl_time_event_notif *notif)
 217 {
 218         struct ieee80211_vif *vif = te_data->vif;
 219         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 220
 221         if (!notif->status)
 222                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 223
 224         switch (te_data->vif->type) {
 225         case NL80211_IFTYPE_AP:
 226                 if (!notif->status)
 227                         mvmvif->csa_failed = true;
 228                 iwl_mvm_csa_noa_start(mvm);
 229                 break;
 230         case NL80211_IFTYPE_STATION:
 231                 if (!notif->status) {
 232                         iwl_mvm_connection_loss(mvm, vif,
 233                                                 "CSA TE failed to start");
 234                         break;
 235                 }
 236                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 237                 ieee80211_chswitch_done(te_data->vif, true);
 238                 break;
 239         default:
 240                 /* should never happen */
 241                 WARN_ON_ONCE(1);
 242                 break;
 243         }
 244
 245         /* we don't need it anymore */
 246         iwl_mvm_te_clear_data(mvm, te_data);
 247 }
 248
 249 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 250                                      struct iwl_time_event_notif *notif,
 251                                      struct iwl_mvm_time_event_data *te_data)
 252 {
 253         struct iwl_fw_dbg_trigger_tlv *trig;
 254         struct iwl_fw_dbg_trigger_time_event *te_trig;
 255         int i;
 256
 257         trig = iwl_fw_dbg_trigger_on(&mvm->fwrt,
 258                                      ieee80211_vif_to_wdev(te_data->vif),
 259                                      FW_DBG_TRIGGER_TIME_EVENT);
 260         if (!trig)
 261                 return;
 262
 263         te_trig = (void *)trig->data;
 264
 265         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 266                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 267                 u32 trig_action_bitmap =
 268                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 269                 u32 trig_status_bitmap =
 270                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 271
 272                 if (trig_te_id != te_data->id ||
 273                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 274                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 275                         continue;
 276
 277                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 278                                         "Time event %d Action 0x%x received status: %d",
 279                                         te_data->id,
 280                                         le32_to_cpu(notif->action),
 281                                         le32_to_cpu(notif->status));
 282                 break;
 283         }
 284 }
 285
 286 /*
 287  * Handles a FW notification for an event that is known to the driver.
 288  *
 289  * @mvm: the mvm component
 290  * @te_data: the time event data
 291  * @notif: the notification data corresponding the time event data.
 292  */
 293 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 294                                     struct iwl_mvm_time_event_data *te_data,
 295                                     struct iwl_time_event_notif *notif)
 296 {
 297         lockdep_assert_held(&mvm->time_event_lock);
 298
 299         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 300                      le32_to_cpu(notif->unique_id),
 301                      le32_to_cpu(notif->action));
 302
 303         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 304
 305         /*
 306          * The FW sends the start/end time event notifications even for events
 307          * that it fails to schedule. This is indicated in the status field of
 308          * the notification. This happens in cases that the scheduler cannot
 309          * find a schedule that can handle the event (for example requesting a
 310          * P2P Device discoveribility, while there are other higher priority
 311          * events in the system).
 312          */
 313         if (!le32_to_cpu(notif->status)) {
 314                 const char *msg;
 315
 316                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 317                         msg = "Time Event start notification failure";
 318                 else
 319                         msg = "Time Event end notification failure";
 320
 321                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 322
 323                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 324                         iwl_mvm_te_clear_data(mvm, te_data);
 325                         return;
 326                 }
 327         }
 328
 329         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 330                 IWL_DEBUG_TE(mvm,
 331                              "TE ended - current time %lu, estimated end %lu\n",
 332                              jiffies, te_data->end_jiffies);
 333
 334                 switch (te_data->vif->type) {
 335                 case NL80211_IFTYPE_P2P_DEVICE:
 336                         ieee80211_remain_on_channel_expired(mvm->hw);
 337                         set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 338                         iwl_mvm_roc_finished(mvm);
 339                         break;
 340                 case NL80211_IFTYPE_STATION:
 341                         /*
 342                          * By now, we should have finished association
 343                          * and know the dtim period.
 344                          */
 345                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 346                                 "No beacon heard and the time event is over already...");
 347                         break;
 348                 default:
 349                         break;
 350                 }
 351
 352                 iwl_mvm_te_clear_data(mvm, te_data);
 353         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 354                 te_data->running = true;
 355                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 356
 357                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 358                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 359                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 360                         ieee80211_ready_on_channel(mvm->hw);
 361                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 362                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 363                 }
 364         } else {
 365                 IWL_WARN(mvm, "Got TE with unknown action\n");
 366         }
 367 }
 368
 369 /*
 370  * Handle A Aux ROC time event
 371  */
 372 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 373                                            struct iwl_time_event_notif *notif)
 374 {
 375         struct iwl_mvm_time_event_data *te_data, *tmp;
 376         bool aux_roc_te = false;
 377
 378         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 379                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 380                         aux_roc_te = true;
 381                         break;
 382                 }
 383         }
 384         if (!aux_roc_te) /* Not a Aux ROC time event */
 385                 return -EINVAL;
 386
 387         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 388
 389         IWL_DEBUG_TE(mvm,
 390                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 391                      le32_to_cpu(notif->unique_id),
 392                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 393
 394         if (!le32_to_cpu(notif->status) ||
 395             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 396                 /* End TE, notify mac80211 */
 397                 ieee80211_remain_on_channel_expired(mvm->hw);
 398                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 399                 list_del(&te_data->list); /* remove from list */
 400                 te_data->running = false;
 401                 te_data->vif = NULL;
 402                 te_data->uid = 0;
 403                 te_data->id = TE_MAX;
 404         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 405                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 406                 te_data->running = true;
 407                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 408                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 409         } else {
 410                 IWL_DEBUG_TE(mvm,
 411                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 412                              le32_to_cpu(notif->action));
 413                 return -EINVAL;
 414         }
 415
 416         return 0;
 417 }
 418
 419 /*
 420  * The Rx handler for time event notifications
 421  */
 422 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 423                                  struct iwl_rx_cmd_buffer *rxb)
 424 {
 425         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 426         struct iwl_time_event_notif *notif = (void *)pkt->data;
 427         struct iwl_mvm_time_event_data *te_data, *tmp;
 428
 429         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 430                      le32_to_cpu(notif->unique_id),
 431                      le32_to_cpu(notif->action));
 432
 433         spin_lock_bh(&mvm->time_event_lock);
 434         /* This time event is triggered for Aux ROC request */
 435         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 436                 goto unlock;
 437
 438         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 439                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 440                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 441         }
 442 unlock:
 443         spin_unlock_bh(&mvm->time_event_lock);
 444 }
 445
 446 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 447                              struct iwl_rx_packet *pkt, void *data)
 448 {
 449         struct iwl_mvm *mvm =
 450                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 451         struct iwl_mvm_time_event_data *te_data = data;
 452         struct iwl_time_event_notif *resp;
 453         int resp_len = iwl_rx_packet_payload_len(pkt);
 454
 455         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 456                 return true;
 457
 458         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 459                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 460                 return true;
 461         }
 462
 463         resp = (void *)pkt->data;
 464
 465         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 466         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 467                 return false;
 468
 469         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 470                      te_data->uid);
 471         if (!resp->status)
 472                 IWL_ERR(mvm,
 473                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 474
 475         return true;
 476 }
 477
 478 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 479                                         struct iwl_rx_packet *pkt, void *data)
 480 {
 481         struct iwl_mvm *mvm =
 482                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 483         struct iwl_mvm_time_event_data *te_data = data;
 484         struct iwl_time_event_resp *resp;
 485         int resp_len = iwl_rx_packet_payload_len(pkt);
 486
 487         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 488                 return true;
 489
 490         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 491                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 492                 return true;
 493         }
 494
 495         resp = (void *)pkt->data;
 496
 497         /* we should never get a response to another TIME_EVENT_CMD here */
 498         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 499                 return false;
 500
 501         te_data->uid = le32_to_cpu(resp->unique_id);
 502         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 503                      te_data->uid);
 504         return true;
 505 }
 506
 507 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 508                                        struct ieee80211_vif *vif,
 509                                        struct iwl_mvm_time_event_data *te_data,
 510                                        struct iwl_time_event_cmd *te_cmd)
 511 {
 512         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 513         struct iwl_notification_wait wait_time_event;
 514         int ret;
 515
 516         lockdep_assert_held(&mvm->mutex);
 517
 518         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 519                      le32_to_cpu(te_cmd->duration));
 520
 521         spin_lock_bh(&mvm->time_event_lock);
 522         if (WARN_ON(te_data->id != TE_MAX)) {
 523                 spin_unlock_bh(&mvm->time_event_lock);
 524                 return -EIO;
 525         }
 526         te_data->vif = vif;
 527         te_data->duration = le32_to_cpu(te_cmd->duration);
 528         te_data->id = le32_to_cpu(te_cmd->id);
 529         list_add_tail(&te_data->list, &mvm->time_event_list);
 530         spin_unlock_bh(&mvm->time_event_lock);
 531
 532         /*
 533          * Use a notification wait, which really just processes the
 534          * command response and doesn't wait for anything, in order
 535          * to be able to process the response and get the UID inside
 536          * the RX path. Using CMD_WANT_SKB doesn't work because it
 537          * stores the buffer and then wakes up this thread, by which
 538          * time another notification (that the time event started)
 539          * might already be processed unsuccessfully.
 540          */
 541         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 542                                    time_event_response,
 543                                    ARRAY_SIZE(time_event_response),
 544                                    iwl_mvm_time_event_response, te_data);
 545
 546         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 547                                             sizeof(*te_cmd), te_cmd);
 548         if (ret) {
 549                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 550                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 551                 goto out_clear_te;
 552         }
 553
 554         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 555         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 556         /* should never fail */
 557         WARN_ON_ONCE(ret);
 558
 559         if (ret) {
 560  out_clear_te:
 561                 spin_lock_bh(&mvm->time_event_lock);
 562                 iwl_mvm_te_clear_data(mvm, te_data);
 563                 spin_unlock_bh(&mvm->time_event_lock);
 564         }
 565         return ret;
 566 }
 567
 568 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 569                              struct ieee80211_vif *vif,
 570                              u32 duration, u32 min_duration,
 571                              u32 max_delay, bool wait_for_notif)
 572 {
 573         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 574         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 575         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 576         struct iwl_notification_wait wait_te_notif;
 577         struct iwl_time_event_cmd time_cmd = {};
 578
 579         lockdep_assert_held(&mvm->mutex);
 580
 581         if (te_data->running &&
 582             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 583                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 584                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 585                 return;
 586         }
 587
 588         if (te_data->running) {
 589                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 590                              te_data->uid,
 591                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 592                 /*
 593                  * we don't have enough time
 594                  * cancel the current TE and issue a new one
 595                  * Of course it would be better to remove the old one only
 596                  * when the new one is added, but we don't care if we are off
 597                  * channel for a bit. All we need to do, is not to return
 598                  * before we actually begin to be on the channel.
 599                  */
 600                 iwl_mvm_stop_session_protection(mvm, vif);
 601         }
 602
 603         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 604         time_cmd.id_and_color =
 605                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 606         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 607
 608         time_cmd.apply_time = cpu_to_le32(0);
 609
 610         time_cmd.max_frags = TE_V2_FRAG_NONE;
 611         time_cmd.max_delay = cpu_to_le32(max_delay);
 612         /* TODO: why do we need to interval = bi if it is not periodic? */
 613         time_cmd.interval = cpu_to_le32(1);
 614         time_cmd.duration = cpu_to_le32(duration);
 615         time_cmd.repeat = 1;
 616         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 617                                       TE_V2_NOTIF_HOST_EVENT_END |
 618                                       TE_V2_START_IMMEDIATELY);
 619
 620         if (!wait_for_notif) {
 621                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 622                 return;
 623         }
 624
 625         /*
 626          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 627          * right after we send the time event
 628          */
 629         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 630                                    te_notif_response,
 631                                    ARRAY_SIZE(te_notif_response),
 632                                    iwl_mvm_te_notif, te_data);
 633
 634         /* If TE was sent OK - wait for the notification that started */
 635         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 636                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 637                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 638         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 639                                          TU_TO_JIFFIES(max_delay))) {
 640                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 641         }
 642 }
 643
 644 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 645                                         struct iwl_mvm_time_event_data *te_data,
 646                                         u32 *uid)
 647 {
 648         u32 id;
 649
 650         /*
 651          * It is possible that by the time we got to this point the time
 652          * event was already removed.
 653          */
 654         spin_lock_bh(&mvm->time_event_lock);
 655
 656         /* Save time event uid before clearing its data */
 657         *uid = te_data->uid;
 658         id = te_data->id;
 659
 660         /*
 661          * The clear_data function handles time events that were already removed
 662          */
 663         iwl_mvm_te_clear_data(mvm, te_data);
 664         spin_unlock_bh(&mvm->time_event_lock);
 665
 666         /*
 667          * It is possible that by the time we try to remove it, the time event
 668          * has already ended and removed. In such a case there is no need to
 669          * send a removal command.
 670          */
 671         if (id == TE_MAX) {
 672                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 673                 return false;
 674         }
 675
 676         return true;
 677 }
 678
 679 /*
 680  * Explicit request to remove a aux roc time event. The removal of a time
 681  * event needs to be synchronized with the flow of a time event's end
 682  * notification, which also removes the time event from the op mode
 683  * data structures.
 684  */
 685 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 686                                       struct iwl_mvm_vif *mvmvif,
 687                                       struct iwl_mvm_time_event_data *te_data)
 688 {
 689         struct iwl_hs20_roc_req aux_cmd = {};
 690         u16 len = sizeof(aux_cmd) - iwl_mvm_chan_info_padding(mvm);
 691
 692         u32 uid;
 693         int ret;
 694
 695         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 696                 return;
 697
 698         aux_cmd.event_unique_id = cpu_to_le32(uid);
 699         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 700         aux_cmd.id_and_color =
 701                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 702         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 703                      le32_to_cpu(aux_cmd.event_unique_id));
 704         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 705                                    len, &aux_cmd);
 706
 707         if (WARN_ON(ret))
 708                 return;
 709 }
 710
 711 /*
 712  * Explicit request to remove a time event. The removal of a time event needs to
 713  * be synchronized with the flow of a time event's end notification, which also
 714  * removes the time event from the op mode data structures.
 715  */
 716 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 717                                struct iwl_mvm_vif *mvmvif,
 718                                struct iwl_mvm_time_event_data *te_data)
 719 {
 720         struct iwl_time_event_cmd time_cmd = {};
 721         u32 uid;
 722         int ret;
 723
 724         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 725                 return;
 726
 727         /* When we remove a TE, the UID is to be set in the id field */
 728         time_cmd.id = cpu_to_le32(uid);
 729         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 730         time_cmd.id_and_color =
 731                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 732
 733         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 734         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 735                                    sizeof(time_cmd), &time_cmd);
 736         if (WARN_ON(ret))
 737                 return;
 738 }
 739
 740 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 741                                      struct ieee80211_vif *vif)
 742 {
 743         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 744         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 745         u32 id;
 746
 747         lockdep_assert_held(&mvm->mutex);
 748
 749         spin_lock_bh(&mvm->time_event_lock);
 750         id = te_data->id;
 751         spin_unlock_bh(&mvm->time_event_lock);
 752
 753         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 754                 IWL_DEBUG_TE(mvm,
 755                              "don't remove TE with id=%u (not session protection)\n",
 756                              id);
 757                 return;
 758         }
 759
 760         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 761 }
 762
 763 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 764                           int duration, enum ieee80211_roc_type type)
 765 {
 766         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 767         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 768         struct iwl_time_event_cmd time_cmd = {};
 769
 770         lockdep_assert_held(&mvm->mutex);
 771         if (te_data->running) {
 772                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 773                 return -EBUSY;
 774         }
 775
 776         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 777         time_cmd.id_and_color =
 778                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 779
 780         switch (type) {
 781         case IEEE80211_ROC_TYPE_NORMAL:
 782                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 783                 break;
 784         case IEEE80211_ROC_TYPE_MGMT_TX:
 785                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 786                 break;
 787         default:
 788                 WARN_ONCE(1, "Got an invalid ROC type\n");
 789                 return -EINVAL;
 790         }
 791
 792         time_cmd.apply_time = cpu_to_le32(0);
 793         time_cmd.interval = cpu_to_le32(1);
 794
 795         /*
 796          * The P2P Device TEs can have lower priority than other events
 797          * that are being scheduled by the driver/fw, and thus it might not be
 798          * scheduled. To improve the chances of it being scheduled, allow them
 799          * to be fragmented, and in addition allow them to be delayed.
 800          */
 801         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 802         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 803         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 804         time_cmd.repeat = 1;
 805         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 806                                       TE_V2_NOTIF_HOST_EVENT_END |
 807                                       TE_V2_START_IMMEDIATELY);
 808
 809         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 810 }
 811
 812 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 813 {
 814         struct iwl_mvm_time_event_data *te_data;
 815
 816         lockdep_assert_held(&mvm->mutex);
 817
 818         spin_lock_bh(&mvm->time_event_lock);
 819
 820         /*
 821          * Iterate over the list of time events and find the time event that is
 822          * associated with a P2P_DEVICE interface.
 823          * This assumes that a P2P_DEVICE interface can have only a single time
 824          * event at any given time and this time event coresponds to a ROC
 825          * request
 826          */
 827         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 828                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 829                         goto out;
 830         }
 831
 832         /* There can only be at most one AUX ROC time event, we just use the
 833          * list to simplify/unify code. Remove it if it exists.
 834          */
 835         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 836                                            struct iwl_mvm_time_event_data,
 837                                            list);
 838 out:
 839         spin_unlock_bh(&mvm->time_event_lock);
 840         return te_data;
 841 }
 842
 843 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 844 {
 845         struct iwl_mvm_time_event_data *te_data;
 846         u32 uid;
 847
 848         te_data = iwl_mvm_get_roc_te(mvm);
 849         if (te_data)
 850                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 851 }
 852
 853 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 854 {
 855         struct iwl_mvm_vif *mvmvif;
 856         struct iwl_mvm_time_event_data *te_data;
 857
 858         te_data = iwl_mvm_get_roc_te(mvm);
 859         if (!te_data) {
 860                 IWL_WARN(mvm, "No remain on channel event\n");
 861                 return;
 862         }
 863
 864         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 865
 866         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 867                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 868                 set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 869         } else {
 870                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 871         }
 872
 873         iwl_mvm_roc_finished(mvm);
 874 }
 875
 876 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 877                                 struct ieee80211_vif *vif,
 878                                 u32 duration, u32 apply_time)
 879 {
 880         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 881         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 882         struct iwl_time_event_cmd time_cmd = {};
 883
 884         lockdep_assert_held(&mvm->mutex);
 885
 886         if (te_data->running) {
 887                 u32 id;
 888
 889                 spin_lock_bh(&mvm->time_event_lock);
 890                 id = te_data->id;
 891                 spin_unlock_bh(&mvm->time_event_lock);
 892
 893                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 894                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 895                         return -EBUSY;
 896                 }
 897
 898                 /*
 899                  * Remove the session protection time event to allow the
 900                  * channel switch. If we got here, we just heard a beacon so
 901                  * the session protection is not needed anymore anyway.
 902                  */
 903                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 904         }
 905
 906         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 907         time_cmd.id_and_color =
 908                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 909         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 910         time_cmd.apply_time = cpu_to_le32(apply_time);
 911         time_cmd.max_frags = TE_V2_FRAG_NONE;
 912         time_cmd.duration = cpu_to_le32(duration);
 913         time_cmd.repeat = 1;
 914         time_cmd.interval = cpu_to_le32(1);
 915         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 916                                       TE_V2_ABSENCE);
 917         if (!apply_time)
 918                 time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
 919
 920         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 921 }