kernel/drivers/net/wireless/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 - 2014 Intel Mobile Communications GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
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  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
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  50  *    from this software without specific prior written permission.
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  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  63  *
  64  *****************************************************************************/
  65
  66 #include <linux/jiffies.h>
  67 #include <net/mac80211.h>
  68
  69 #include "iwl-notif-wait.h"
  70 #include "iwl-trans.h"
  71 #include "fw-api.h"
  72 #include "time-event.h"
  73 #include "mvm.h"
  74 #include "iwl-io.h"
  75 #include "iwl-prph.h"
  76
  77 /*
  78  * For the high priority TE use a time event type that has similar priority to
  79  * the FW's action scan priority.
  80  */
  81 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  82 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  83
  84 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  85                            struct iwl_mvm_time_event_data *te_data)
  86 {
  87         lockdep_assert_held(&mvm->time_event_lock);
  88
  89         if (te_data->id == TE_MAX)
  90                 return;
  91
  92         list_del(&te_data->list);
  93         te_data->running = false;
  94         te_data->uid = 0;
  95         te_data->id = TE_MAX;
  96         te_data->vif = NULL;
  97 }
  98
  99 void iwl_mvm_roc_done_wk(struct work_struct *wk)
 100 {
 101         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 102         u32 queues = 0;
 103
 104         /*
 105          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 106          * This will cause the TX path to drop offchannel transmissions.
 107          * That would also be done by mac80211, but it is racy, in particular
 108          * in the case that the time event actually completed in the firmware
 109          * (which is handled in iwl_mvm_te_handle_notif).
 110          */
 111         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status))
 112                 queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 113         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
 114                 queues |= BIT(mvm->aux_queue);
 115
 116         iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 117
 118         synchronize_net();
 119
 120         /*
 121          * Flush the offchannel queue -- this is called when the time
 122          * event finishes or is canceled, so that frames queued for it
 123          * won't get stuck on the queue and be transmitted in the next
 124          * time event.
 125          * We have to send the command asynchronously since this cannot
 126          * be under the mutex for locking reasons, but that's not an
 127          * issue as it will have to complete before the next command is
 128          * executed, and a new time event means a new command.
 129          */
 130         iwl_mvm_flush_tx_path(mvm, queues, false);
 131 }
 132
 133 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 134 {
 135         /*
 136          * Of course, our status bit is just as racy as mac80211, so in
 137          * addition, fire off the work struct which will drop all frames
 138          * from the hardware queues that made it through the race. First
 139          * it will of course synchronize the TX path to make sure that
 140          * any *new* TX will be rejected.
 141          */
 142         schedule_work(&mvm->roc_done_wk);
 143 }
 144
 145 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 146 {
 147         struct ieee80211_vif *csa_vif;
 148
 149         rcu_read_lock();
 150
 151         csa_vif = rcu_dereference(mvm->csa_vif);
 152         if (!csa_vif || !csa_vif->csa_active)
 153                 goto out_unlock;
 154
 155         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 156
 157         /*
 158          * CSA NoA is started but we still have beacons to
 159          * transmit on the current channel.
 160          * So we just do nothing here and the switch
 161          * will be performed on the last TBTT.
 162          */
 163         if (!ieee80211_csa_is_complete(csa_vif)) {
 164                 IWL_WARN(mvm, "CSA NOA started too early\n");
 165                 goto out_unlock;
 166         }
 167
 168         ieee80211_csa_finish(csa_vif);
 169
 170         rcu_read_unlock();
 171
 172         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 173
 174         return;
 175
 176 out_unlock:
 177         rcu_read_unlock();
 178 }
 179
 180 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 181                                         struct ieee80211_vif *vif,
 182                                         const char *errmsg)
 183 {
 184         if (vif->type != NL80211_IFTYPE_STATION)
 185                 return false;
 186         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 187                 return false;
 188         if (errmsg)
 189                 IWL_ERR(mvm, "%s\n", errmsg);
 190
 191         iwl_mvm_connection_loss(mvm, vif, errmsg);
 192         return true;
 193 }
 194
 195 static void
 196 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 197                              struct iwl_mvm_time_event_data *te_data,
 198                              struct iwl_time_event_notif *notif)
 199 {
 200         struct ieee80211_vif *vif = te_data->vif;
 201         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 202
 203         if (!notif->status)
 204                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 205
 206         switch (te_data->vif->type) {
 207         case NL80211_IFTYPE_AP:
 208                 if (!notif->status)
 209                         mvmvif->csa_failed = true;
 210                 iwl_mvm_csa_noa_start(mvm);
 211                 break;
 212         case NL80211_IFTYPE_STATION:
 213                 if (!notif->status) {
 214                         iwl_mvm_connection_loss(mvm, vif,
 215                                                 "CSA TE failed to start");
 216                         break;
 217                 }
 218                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 219                 ieee80211_chswitch_done(te_data->vif, true);
 220                 break;
 221         default:
 222                 /* should never happen */
 223                 WARN_ON_ONCE(1);
 224                 break;
 225         }
 226
 227         /* we don't need it anymore */
 228         iwl_mvm_te_clear_data(mvm, te_data);
 229 }
 230
 231 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 232                                      struct iwl_time_event_notif *notif,
 233                                      struct iwl_mvm_time_event_data *te_data)
 234 {
 235         struct iwl_fw_dbg_trigger_tlv *trig;
 236         struct iwl_fw_dbg_trigger_time_event *te_trig;
 237         int i;
 238
 239         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 240                 return;
 241
 242         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 243         te_trig = (void *)trig->data;
 244
 245         if (!iwl_fw_dbg_trigger_check_stop(mvm, te_data->vif, trig))
 246                 return;
 247
 248         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 249                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 250                 u32 trig_action_bitmap =
 251                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 252                 u32 trig_status_bitmap =
 253                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 254
 255                 if (trig_te_id != te_data->id ||
 256                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 257                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 258                         continue;
 259
 260                 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
 261                                             "Time event %d Action 0x%x received status: %d",
 262                                             te_data->id,
 263                                             le32_to_cpu(notif->action),
 264                                             le32_to_cpu(notif->status));
 265                 break;
 266         }
 267 }
 268
 269 /*
 270  * Handles a FW notification for an event that is known to the driver.
 271  *
 272  * @mvm: the mvm component
 273  * @te_data: the time event data
 274  * @notif: the notification data corresponding the time event data.
 275  */
 276 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 277                                     struct iwl_mvm_time_event_data *te_data,
 278                                     struct iwl_time_event_notif *notif)
 279 {
 280         lockdep_assert_held(&mvm->time_event_lock);
 281
 282         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 283                      le32_to_cpu(notif->unique_id),
 284                      le32_to_cpu(notif->action));
 285
 286         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 287
 288         /*
 289          * The FW sends the start/end time event notifications even for events
 290          * that it fails to schedule. This is indicated in the status field of
 291          * the notification. This happens in cases that the scheduler cannot
 292          * find a schedule that can handle the event (for example requesting a
 293          * P2P Device discoveribility, while there are other higher priority
 294          * events in the system).
 295          */
 296         if (!le32_to_cpu(notif->status)) {
 297                 const char *msg;
 298
 299                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 300                         msg = "Time Event start notification failure";
 301                 else
 302                         msg = "Time Event end notification failure";
 303
 304                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 305
 306                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 307                         iwl_mvm_te_clear_data(mvm, te_data);
 308                         return;
 309                 }
 310         }
 311
 312         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 313                 IWL_DEBUG_TE(mvm,
 314                              "TE ended - current time %lu, estimated end %lu\n",
 315                              jiffies, te_data->end_jiffies);
 316
 317                 switch (te_data->vif->type) {
 318                 case NL80211_IFTYPE_P2P_DEVICE:
 319                         ieee80211_remain_on_channel_expired(mvm->hw);
 320                         iwl_mvm_roc_finished(mvm);
 321                         break;
 322                 case NL80211_IFTYPE_STATION:
 323                         /*
 324                          * By now, we should have finished association
 325                          * and know the dtim period.
 326                          */
 327                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 328                                 "No association and the time event is over already...");
 329                         break;
 330                 default:
 331                         break;
 332                 }
 333
 334                 iwl_mvm_te_clear_data(mvm, te_data);
 335         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 336                 te_data->running = true;
 337                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 338
 339                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 340                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 341                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 342                         ieee80211_ready_on_channel(mvm->hw);
 343                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 344                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 345                 }
 346         } else {
 347                 IWL_WARN(mvm, "Got TE with unknown action\n");
 348         }
 349 }
 350
 351 /*
 352  * Handle A Aux ROC time event
 353  */
 354 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 355                                            struct iwl_time_event_notif *notif)
 356 {
 357         struct iwl_mvm_time_event_data *te_data, *tmp;
 358         bool aux_roc_te = false;
 359
 360         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 361                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 362                         aux_roc_te = true;
 363                         break;
 364                 }
 365         }
 366         if (!aux_roc_te) /* Not a Aux ROC time event */
 367                 return -EINVAL;
 368
 369         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 370
 371         if (!le32_to_cpu(notif->status)) {
 372                 IWL_DEBUG_TE(mvm,
 373                              "ERROR: Aux ROC Time Event %s notification failure\n",
 374                              (le32_to_cpu(notif->action) &
 375                               TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end");
 376                 return -EINVAL;
 377         }
 378
 379         IWL_DEBUG_TE(mvm,
 380                      "Aux ROC time event notification  - UID = 0x%x action %d\n",
 381                      le32_to_cpu(notif->unique_id),
 382                      le32_to_cpu(notif->action));
 383
 384         if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 385                 /* End TE, notify mac80211 */
 386                 ieee80211_remain_on_channel_expired(mvm->hw);
 387                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 388                 list_del(&te_data->list); /* remove from list */
 389                 te_data->running = false;
 390                 te_data->vif = NULL;
 391                 te_data->uid = 0;
 392                 te_data->id = TE_MAX;
 393         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 394                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 395                 te_data->running = true;
 396                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 397         } else {
 398                 IWL_DEBUG_TE(mvm,
 399                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 400                              le32_to_cpu(notif->action));
 401                 return -EINVAL;
 402         }
 403
 404         return 0;
 405 }
 406
 407 /*
 408  * The Rx handler for time event notifications
 409  */
 410 int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 411                                 struct iwl_rx_cmd_buffer *rxb,
 412                                 struct iwl_device_cmd *cmd)
 413 {
 414         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 415         struct iwl_time_event_notif *notif = (void *)pkt->data;
 416         struct iwl_mvm_time_event_data *te_data, *tmp;
 417
 418         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 419                      le32_to_cpu(notif->unique_id),
 420                      le32_to_cpu(notif->action));
 421
 422         spin_lock_bh(&mvm->time_event_lock);
 423         /* This time event is triggered for Aux ROC request */
 424         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 425                 goto unlock;
 426
 427         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 428                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 429                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 430         }
 431 unlock:
 432         spin_unlock_bh(&mvm->time_event_lock);
 433
 434         return 0;
 435 }
 436
 437 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 438                              struct iwl_rx_packet *pkt, void *data)
 439 {
 440         struct iwl_mvm *mvm =
 441                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 442         struct iwl_mvm_time_event_data *te_data = data;
 443         struct iwl_time_event_notif *resp;
 444         int resp_len = iwl_rx_packet_payload_len(pkt);
 445
 446         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 447                 return true;
 448
 449         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 450                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 451                 return true;
 452         }
 453
 454         resp = (void *)pkt->data;
 455
 456         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 457         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 458                 return false;
 459
 460         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 461                      te_data->uid);
 462         if (!resp->status)
 463                 IWL_ERR(mvm,
 464                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 465
 466         return true;
 467 }
 468
 469 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 470                                         struct iwl_rx_packet *pkt, void *data)
 471 {
 472         struct iwl_mvm *mvm =
 473                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 474         struct iwl_mvm_time_event_data *te_data = data;
 475         struct iwl_time_event_resp *resp;
 476         int resp_len = iwl_rx_packet_payload_len(pkt);
 477
 478         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 479                 return true;
 480
 481         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 482                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 483                 return true;
 484         }
 485
 486         resp = (void *)pkt->data;
 487
 488         /* we should never get a response to another TIME_EVENT_CMD here */
 489         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 490                 return false;
 491
 492         te_data->uid = le32_to_cpu(resp->unique_id);
 493         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 494                      te_data->uid);
 495         return true;
 496 }
 497
 498 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 499                                        struct ieee80211_vif *vif,
 500                                        struct iwl_mvm_time_event_data *te_data,
 501                                        struct iwl_time_event_cmd *te_cmd)
 502 {
 503         static const u8 time_event_response[] = { TIME_EVENT_CMD };
 504         struct iwl_notification_wait wait_time_event;
 505         int ret;
 506
 507         lockdep_assert_held(&mvm->mutex);
 508
 509         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 510                      le32_to_cpu(te_cmd->duration));
 511
 512         spin_lock_bh(&mvm->time_event_lock);
 513         if (WARN_ON(te_data->id != TE_MAX)) {
 514                 spin_unlock_bh(&mvm->time_event_lock);
 515                 return -EIO;
 516         }
 517         te_data->vif = vif;
 518         te_data->duration = le32_to_cpu(te_cmd->duration);
 519         te_data->id = le32_to_cpu(te_cmd->id);
 520         list_add_tail(&te_data->list, &mvm->time_event_list);
 521         spin_unlock_bh(&mvm->time_event_lock);
 522
 523         /*
 524          * Use a notification wait, which really just processes the
 525          * command response and doesn't wait for anything, in order
 526          * to be able to process the response and get the UID inside
 527          * the RX path. Using CMD_WANT_SKB doesn't work because it
 528          * stores the buffer and then wakes up this thread, by which
 529          * time another notification (that the time event started)
 530          * might already be processed unsuccessfully.
 531          */
 532         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 533                                    time_event_response,
 534                                    ARRAY_SIZE(time_event_response),
 535                                    iwl_mvm_time_event_response, te_data);
 536
 537         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 538                                             sizeof(*te_cmd), te_cmd);
 539         if (ret) {
 540                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 541                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 542                 goto out_clear_te;
 543         }
 544
 545         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 546         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 547         /* should never fail */
 548         WARN_ON_ONCE(ret);
 549
 550         if (ret) {
 551  out_clear_te:
 552                 spin_lock_bh(&mvm->time_event_lock);
 553                 iwl_mvm_te_clear_data(mvm, te_data);
 554                 spin_unlock_bh(&mvm->time_event_lock);
 555         }
 556         return ret;
 557 }
 558
 559 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 560                              struct ieee80211_vif *vif,
 561                              u32 duration, u32 min_duration,
 562                              u32 max_delay, bool wait_for_notif)
 563 {
 564         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 565         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 566         const u8 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 567         struct iwl_notification_wait wait_te_notif;
 568         struct iwl_time_event_cmd time_cmd = {};
 569
 570         lockdep_assert_held(&mvm->mutex);
 571
 572         if (te_data->running &&
 573             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 574                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 575                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 576                 return;
 577         }
 578
 579         if (te_data->running) {
 580                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 581                              te_data->uid,
 582                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 583                 /*
 584                  * we don't have enough time
 585                  * cancel the current TE and issue a new one
 586                  * Of course it would be better to remove the old one only
 587                  * when the new one is added, but we don't care if we are off
 588                  * channel for a bit. All we need to do, is not to return
 589                  * before we actually begin to be on the channel.
 590                  */
 591                 iwl_mvm_stop_session_protection(mvm, vif);
 592         }
 593
 594         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 595         time_cmd.id_and_color =
 596                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 597         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 598
 599         time_cmd.apply_time =
 600                 cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG));
 601
 602         time_cmd.max_frags = TE_V2_FRAG_NONE;
 603         time_cmd.max_delay = cpu_to_le32(max_delay);
 604         /* TODO: why do we need to interval = bi if it is not periodic? */
 605         time_cmd.interval = cpu_to_le32(1);
 606         time_cmd.duration = cpu_to_le32(duration);
 607         time_cmd.repeat = 1;
 608         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 609                                       TE_V2_NOTIF_HOST_EVENT_END |
 610                                       T2_V2_START_IMMEDIATELY);
 611
 612         if (!wait_for_notif) {
 613                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 614                 return;
 615         }
 616
 617         /*
 618          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 619          * right after we send the time event
 620          */
 621         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 622                                    te_notif_response,
 623                                    ARRAY_SIZE(te_notif_response),
 624                                    iwl_mvm_te_notif, te_data);
 625
 626         /* If TE was sent OK - wait for the notification that started */
 627         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 628                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 629                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 630         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 631                                          TU_TO_JIFFIES(max_delay))) {
 632                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 633         }
 634 }
 635
 636 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 637                                         struct iwl_mvm_time_event_data *te_data,
 638                                         u32 *uid)
 639 {
 640         u32 id;
 641
 642         /*
 643          * It is possible that by the time we got to this point the time
 644          * event was already removed.
 645          */
 646         spin_lock_bh(&mvm->time_event_lock);
 647
 648         /* Save time event uid before clearing its data */
 649         *uid = te_data->uid;
 650         id = te_data->id;
 651
 652         /*
 653          * The clear_data function handles time events that were already removed
 654          */
 655         iwl_mvm_te_clear_data(mvm, te_data);
 656         spin_unlock_bh(&mvm->time_event_lock);
 657
 658         /*
 659          * It is possible that by the time we try to remove it, the time event
 660          * has already ended and removed. In such a case there is no need to
 661          * send a removal command.
 662          */
 663         if (id == TE_MAX) {
 664                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 665                 return false;
 666         }
 667
 668         return true;
 669 }
 670
 671 /*
 672  * Explicit request to remove a aux roc time event. The removal of a time
 673  * event needs to be synchronized with the flow of a time event's end
 674  * notification, which also removes the time event from the op mode
 675  * data structures.
 676  */
 677 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 678                                       struct iwl_mvm_vif *mvmvif,
 679                                       struct iwl_mvm_time_event_data *te_data)
 680 {
 681         struct iwl_hs20_roc_req aux_cmd = {};
 682         u32 uid;
 683         int ret;
 684
 685         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 686                 return;
 687
 688         aux_cmd.event_unique_id = cpu_to_le32(uid);
 689         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 690         aux_cmd.id_and_color =
 691                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 692         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 693                      le32_to_cpu(aux_cmd.event_unique_id));
 694         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 695                                    sizeof(aux_cmd), &aux_cmd);
 696
 697         if (WARN_ON(ret))
 698                 return;
 699 }
 700
 701 /*
 702  * Explicit request to remove a time event. The removal of a time event needs to
 703  * be synchronized with the flow of a time event's end notification, which also
 704  * removes the time event from the op mode data structures.
 705  */
 706 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 707                                struct iwl_mvm_vif *mvmvif,
 708                                struct iwl_mvm_time_event_data *te_data)
 709 {
 710         struct iwl_time_event_cmd time_cmd = {};
 711         u32 uid;
 712         int ret;
 713
 714         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 715                 return;
 716
 717         /* When we remove a TE, the UID is to be set in the id field */
 718         time_cmd.id = cpu_to_le32(uid);
 719         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 720         time_cmd.id_and_color =
 721                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 722
 723         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 724         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 725                                    sizeof(time_cmd), &time_cmd);
 726         if (WARN_ON(ret))
 727                 return;
 728 }
 729
 730 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 731                                      struct ieee80211_vif *vif)
 732 {
 733         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 734         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 735
 736         lockdep_assert_held(&mvm->mutex);
 737         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 738 }
 739
 740 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 741                           int duration, enum ieee80211_roc_type type)
 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         struct iwl_time_event_cmd time_cmd = {};
 746
 747         lockdep_assert_held(&mvm->mutex);
 748         if (te_data->running) {
 749                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 750                 return -EBUSY;
 751         }
 752
 753         /*
 754          * Flush the done work, just in case it's still pending, so that
 755          * the work it does can complete and we can accept new frames.
 756          */
 757         flush_work(&mvm->roc_done_wk);
 758
 759         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 760         time_cmd.id_and_color =
 761                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 762
 763         switch (type) {
 764         case IEEE80211_ROC_TYPE_NORMAL:
 765                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 766                 break;
 767         case IEEE80211_ROC_TYPE_MGMT_TX:
 768                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 769                 break;
 770         default:
 771                 WARN_ONCE(1, "Got an invalid ROC type\n");
 772                 return -EINVAL;
 773         }
 774
 775         time_cmd.apply_time = cpu_to_le32(0);
 776         time_cmd.interval = cpu_to_le32(1);
 777
 778         /*
 779          * The P2P Device TEs can have lower priority than other events
 780          * that are being scheduled by the driver/fw, and thus it might not be
 781          * scheduled. To improve the chances of it being scheduled, allow them
 782          * to be fragmented, and in addition allow them to be delayed.
 783          */
 784         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 785         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 786         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 787         time_cmd.repeat = 1;
 788         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 789                                       TE_V2_NOTIF_HOST_EVENT_END |
 790                                       T2_V2_START_IMMEDIATELY);
 791
 792         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 793 }
 794
 795 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 796 {
 797         struct iwl_mvm_vif *mvmvif;
 798         struct iwl_mvm_time_event_data *te_data;
 799         bool is_p2p = false;
 800
 801         lockdep_assert_held(&mvm->mutex);
 802
 803         mvmvif = NULL;
 804         spin_lock_bh(&mvm->time_event_lock);
 805
 806         /*
 807          * Iterate over the list of time events and find the time event that is
 808          * associated with a P2P_DEVICE interface.
 809          * This assumes that a P2P_DEVICE interface can have only a single time
 810          * event at any given time and this time event coresponds to a ROC
 811          * request
 812          */
 813         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 814                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 815                         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 816                         is_p2p = true;
 817                         goto remove_te;
 818                 }
 819         }
 820
 821         /*
 822          * Iterate over the list of aux roc time events and find the time
 823          * event that is associated with a BSS interface.
 824          * This assumes that a BSS interface can have only a single time
 825          * event at any given time and this time event corresponds to a ROC
 826          * request
 827          */
 828         list_for_each_entry(te_data, &mvm->aux_roc_te_list, list) {
 829                 mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 830                 goto remove_te;
 831         }
 832
 833 remove_te:
 834         spin_unlock_bh(&mvm->time_event_lock);
 835
 836         if (!mvmvif) {
 837                 IWL_WARN(mvm, "No remain on channel event\n");
 838                 return;
 839         }
 840
 841         if (is_p2p)
 842                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 843         else
 844                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 845
 846         iwl_mvm_roc_finished(mvm);
 847 }
 848
 849 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 850                                 struct ieee80211_vif *vif,
 851                                 u32 duration, u32 apply_time)
 852 {
 853         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 854         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 855         struct iwl_time_event_cmd time_cmd = {};
 856
 857         lockdep_assert_held(&mvm->mutex);
 858
 859         if (te_data->running) {
 860                 IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 861                 return -EBUSY;
 862         }
 863
 864         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 865         time_cmd.id_and_color =
 866                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 867         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 868         time_cmd.apply_time = cpu_to_le32(apply_time);
 869         time_cmd.max_frags = TE_V2_FRAG_NONE;
 870         time_cmd.duration = cpu_to_le32(duration);
 871         time_cmd.repeat = 1;
 872         time_cmd.interval = cpu_to_le32(1);
 873         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 874                                       TE_V2_ABSENCE);
 875
 876         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 877 }