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 - 2015 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
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
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  29  *  Intel Linux Wireless <ilw@linux.intel.com>
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  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
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  39  * modification, are permitted provided that the following conditions
  40  * are met:
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  43  *    notice, this list of conditions and the following disclaimer.
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  46  *    the documentation and/or other materials provided with the
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  49  *    contributors may be used to endorse or promote products derived
  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  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,
  57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  59  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  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->vif)
  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                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 114         }
 115         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
 116                 queues |= BIT(mvm->aux_queue);
 117                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 118         }
 119
 120         synchronize_net();
 121
 122         /*
 123          * Flush the offchannel queue -- this is called when the time
 124          * event finishes or is canceled, so that frames queued for it
 125          * won't get stuck on the queue and be transmitted in the next
 126          * time event.
 127          * We have to send the command asynchronously since this cannot
 128          * be under the mutex for locking reasons, but that's not an
 129          * issue as it will have to complete before the next command is
 130          * executed, and a new time event means a new command.
 131          */
 132         iwl_mvm_flush_tx_path(mvm, queues, false);
 133 }
 134
 135 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 136 {
 137         /*
 138          * Of course, our status bit is just as racy as mac80211, so in
 139          * addition, fire off the work struct which will drop all frames
 140          * from the hardware queues that made it through the race. First
 141          * it will of course synchronize the TX path to make sure that
 142          * any *new* TX will be rejected.
 143          */
 144         schedule_work(&mvm->roc_done_wk);
 145 }
 146
 147 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 148 {
 149         struct ieee80211_vif *csa_vif;
 150
 151         rcu_read_lock();
 152
 153         csa_vif = rcu_dereference(mvm->csa_vif);
 154         if (!csa_vif || !csa_vif->csa_active)
 155                 goto out_unlock;
 156
 157         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 158
 159         /*
 160          * CSA NoA is started but we still have beacons to
 161          * transmit on the current channel.
 162          * So we just do nothing here and the switch
 163          * will be performed on the last TBTT.
 164          */
 165         if (!ieee80211_csa_is_complete(csa_vif)) {
 166                 IWL_WARN(mvm, "CSA NOA started too early\n");
 167                 goto out_unlock;
 168         }
 169
 170         ieee80211_csa_finish(csa_vif);
 171
 172         rcu_read_unlock();
 173
 174         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 175
 176         return;
 177
 178 out_unlock:
 179         rcu_read_unlock();
 180 }
 181
 182 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 183                                         struct ieee80211_vif *vif,
 184                                         const char *errmsg)
 185 {
 186         if (vif->type != NL80211_IFTYPE_STATION)
 187                 return false;
 188         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 189                 return false;
 190         if (errmsg)
 191                 IWL_ERR(mvm, "%s\n", errmsg);
 192
 193         iwl_mvm_connection_loss(mvm, vif, errmsg);
 194         return true;
 195 }
 196
 197 static void
 198 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 199                              struct iwl_mvm_time_event_data *te_data,
 200                              struct iwl_time_event_notif *notif)
 201 {
 202         struct ieee80211_vif *vif = te_data->vif;
 203         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 204
 205         if (!notif->status)
 206                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 207
 208         switch (te_data->vif->type) {
 209         case NL80211_IFTYPE_AP:
 210                 if (!notif->status)
 211                         mvmvif->csa_failed = true;
 212                 iwl_mvm_csa_noa_start(mvm);
 213                 break;
 214         case NL80211_IFTYPE_STATION:
 215                 if (!notif->status) {
 216                         iwl_mvm_connection_loss(mvm, vif,
 217                                                 "CSA TE failed to start");
 218                         break;
 219                 }
 220                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 221                 ieee80211_chswitch_done(te_data->vif, true);
 222                 break;
 223         default:
 224                 /* should never happen */
 225                 WARN_ON_ONCE(1);
 226                 break;
 227         }
 228
 229         /* we don't need it anymore */
 230         iwl_mvm_te_clear_data(mvm, te_data);
 231 }
 232
 233 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 234                                      struct iwl_time_event_notif *notif,
 235                                      struct iwl_mvm_time_event_data *te_data)
 236 {
 237         struct iwl_fw_dbg_trigger_tlv *trig;
 238         struct iwl_fw_dbg_trigger_time_event *te_trig;
 239         int i;
 240
 241         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 242                 return;
 243
 244         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 245         te_trig = (void *)trig->data;
 246
 247         if (!iwl_fw_dbg_trigger_check_stop(mvm, te_data->vif, trig))
 248                 return;
 249
 250         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 251                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 252                 u32 trig_action_bitmap =
 253                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 254                 u32 trig_status_bitmap =
 255                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 256
 257                 if (trig_te_id != te_data->id ||
 258                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 259                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 260                         continue;
 261
 262                 iwl_mvm_fw_dbg_collect_trig(mvm, trig,
 263                                             "Time event %d Action 0x%x received status: %d",
 264                                             te_data->id,
 265                                             le32_to_cpu(notif->action),
 266                                             le32_to_cpu(notif->status));
 267                 break;
 268         }
 269 }
 270
 271 /*
 272  * Handles a FW notification for an event that is known to the driver.
 273  *
 274  * @mvm: the mvm component
 275  * @te_data: the time event data
 276  * @notif: the notification data corresponding the time event data.
 277  */
 278 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 279                                     struct iwl_mvm_time_event_data *te_data,
 280                                     struct iwl_time_event_notif *notif)
 281 {
 282         lockdep_assert_held(&mvm->time_event_lock);
 283
 284         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 285                      le32_to_cpu(notif->unique_id),
 286                      le32_to_cpu(notif->action));
 287
 288         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 289
 290         /*
 291          * The FW sends the start/end time event notifications even for events
 292          * that it fails to schedule. This is indicated in the status field of
 293          * the notification. This happens in cases that the scheduler cannot
 294          * find a schedule that can handle the event (for example requesting a
 295          * P2P Device discoveribility, while there are other higher priority
 296          * events in the system).
 297          */
 298         if (!le32_to_cpu(notif->status)) {
 299                 const char *msg;
 300
 301                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 302                         msg = "Time Event start notification failure";
 303                 else
 304                         msg = "Time Event end notification failure";
 305
 306                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 307
 308                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 309                         iwl_mvm_te_clear_data(mvm, te_data);
 310                         return;
 311                 }
 312         }
 313
 314         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 315                 IWL_DEBUG_TE(mvm,
 316                              "TE ended - current time %lu, estimated end %lu\n",
 317                              jiffies, te_data->end_jiffies);
 318
 319                 switch (te_data->vif->type) {
 320                 case NL80211_IFTYPE_P2P_DEVICE:
 321                         ieee80211_remain_on_channel_expired(mvm->hw);
 322                         iwl_mvm_roc_finished(mvm);
 323                         break;
 324                 case NL80211_IFTYPE_STATION:
 325                         /*
 326                          * By now, we should have finished association
 327                          * and know the dtim period.
 328                          */
 329                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 330                                 "No association and the time event is over already...");
 331                         break;
 332                 default:
 333                         break;
 334                 }
 335
 336                 iwl_mvm_te_clear_data(mvm, te_data);
 337         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 338                 te_data->running = true;
 339                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 340
 341                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 342                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 343                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 344                         ieee80211_ready_on_channel(mvm->hw);
 345                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 346                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 347                 }
 348         } else {
 349                 IWL_WARN(mvm, "Got TE with unknown action\n");
 350         }
 351 }
 352
 353 /*
 354  * Handle A Aux ROC time event
 355  */
 356 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 357                                            struct iwl_time_event_notif *notif)
 358 {
 359         struct iwl_mvm_time_event_data *te_data, *tmp;
 360         bool aux_roc_te = false;
 361
 362         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 363                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 364                         aux_roc_te = true;
 365                         break;
 366                 }
 367         }
 368         if (!aux_roc_te) /* Not a Aux ROC time event */
 369                 return -EINVAL;
 370
 371         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 372
 373         if (!le32_to_cpu(notif->status)) {
 374                 IWL_DEBUG_TE(mvm,
 375                              "ERROR: Aux ROC Time Event %s notification failure\n",
 376                              (le32_to_cpu(notif->action) &
 377                               TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end");
 378                 return -EINVAL;
 379         }
 380
 381         IWL_DEBUG_TE(mvm,
 382                      "Aux ROC time event notification  - UID = 0x%x action %d\n",
 383                      le32_to_cpu(notif->unique_id),
 384                      le32_to_cpu(notif->action));
 385
 386         if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 387                 /* End TE, notify mac80211 */
 388                 ieee80211_remain_on_channel_expired(mvm->hw);
 389                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 390                 list_del(&te_data->list); /* remove from list */
 391                 te_data->running = false;
 392                 te_data->vif = NULL;
 393                 te_data->uid = 0;
 394                 te_data->id = TE_MAX;
 395         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 396                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 397                 te_data->running = true;
 398                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 399                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 400         } else {
 401                 IWL_DEBUG_TE(mvm,
 402                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 403                              le32_to_cpu(notif->action));
 404                 return -EINVAL;
 405         }
 406
 407         return 0;
 408 }
 409
 410 /*
 411  * The Rx handler for time event notifications
 412  */
 413 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 414                                  struct iwl_rx_cmd_buffer *rxb)
 415 {
 416         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 417         struct iwl_time_event_notif *notif = (void *)pkt->data;
 418         struct iwl_mvm_time_event_data *te_data, *tmp;
 419
 420         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 421                      le32_to_cpu(notif->unique_id),
 422                      le32_to_cpu(notif->action));
 423
 424         spin_lock_bh(&mvm->time_event_lock);
 425         /* This time event is triggered for Aux ROC request */
 426         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 427                 goto unlock;
 428
 429         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 430                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 431                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 432         }
 433 unlock:
 434         spin_unlock_bh(&mvm->time_event_lock);
 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 u16 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 u16 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 = cpu_to_le32(0);
 600
 601         time_cmd.max_frags = TE_V2_FRAG_NONE;
 602         time_cmd.max_delay = cpu_to_le32(max_delay);
 603         /* TODO: why do we need to interval = bi if it is not periodic? */
 604         time_cmd.interval = cpu_to_le32(1);
 605         time_cmd.duration = cpu_to_le32(duration);
 606         time_cmd.repeat = 1;
 607         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 608                                       TE_V2_NOTIF_HOST_EVENT_END |
 609                                       T2_V2_START_IMMEDIATELY);
 610
 611         if (!wait_for_notif) {
 612                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 613                 return;
 614         }
 615
 616         /*
 617          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 618          * right after we send the time event
 619          */
 620         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 621                                    te_notif_response,
 622                                    ARRAY_SIZE(te_notif_response),
 623                                    iwl_mvm_te_notif, te_data);
 624
 625         /* If TE was sent OK - wait for the notification that started */
 626         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 627                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 628                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 629         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 630                                          TU_TO_JIFFIES(max_delay))) {
 631                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 632         }
 633 }
 634
 635 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 636                                         struct iwl_mvm_time_event_data *te_data,
 637                                         u32 *uid)
 638 {
 639         u32 id;
 640
 641         /*
 642          * It is possible that by the time we got to this point the time
 643          * event was already removed.
 644          */
 645         spin_lock_bh(&mvm->time_event_lock);
 646
 647         /* Save time event uid before clearing its data */
 648         *uid = te_data->uid;
 649         id = te_data->id;
 650
 651         /*
 652          * The clear_data function handles time events that were already removed
 653          */
 654         iwl_mvm_te_clear_data(mvm, te_data);
 655         spin_unlock_bh(&mvm->time_event_lock);
 656
 657         /*
 658          * It is possible that by the time we try to remove it, the time event
 659          * has already ended and removed. In such a case there is no need to
 660          * send a removal command.
 661          */
 662         if (id == TE_MAX) {
 663                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 664                 return false;
 665         }
 666
 667         return true;
 668 }
 669
 670 /*
 671  * Explicit request to remove a aux roc time event. The removal of a time
 672  * event needs to be synchronized with the flow of a time event's end
 673  * notification, which also removes the time event from the op mode
 674  * data structures.
 675  */
 676 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 677                                       struct iwl_mvm_vif *mvmvif,
 678                                       struct iwl_mvm_time_event_data *te_data)
 679 {
 680         struct iwl_hs20_roc_req aux_cmd = {};
 681         u32 uid;
 682         int ret;
 683
 684         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 685                 return;
 686
 687         aux_cmd.event_unique_id = cpu_to_le32(uid);
 688         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 689         aux_cmd.id_and_color =
 690                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 691         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 692                      le32_to_cpu(aux_cmd.event_unique_id));
 693         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 694                                    sizeof(aux_cmd), &aux_cmd);
 695
 696         if (WARN_ON(ret))
 697                 return;
 698 }
 699
 700 /*
 701  * Explicit request to remove a time event. The removal of a time event needs to
 702  * be synchronized with the flow of a time event's end notification, which also
 703  * removes the time event from the op mode data structures.
 704  */
 705 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 706                                struct iwl_mvm_vif *mvmvif,
 707                                struct iwl_mvm_time_event_data *te_data)
 708 {
 709         struct iwl_time_event_cmd time_cmd = {};
 710         u32 uid;
 711         int ret;
 712
 713         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 714                 return;
 715
 716         /* When we remove a TE, the UID is to be set in the id field */
 717         time_cmd.id = cpu_to_le32(uid);
 718         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 719         time_cmd.id_and_color =
 720                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 721
 722         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 723         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 724                                    sizeof(time_cmd), &time_cmd);
 725         if (WARN_ON(ret))
 726                 return;
 727 }
 728
 729 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 730                                      struct ieee80211_vif *vif)
 731 {
 732         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 733         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 734
 735         lockdep_assert_held(&mvm->mutex);
 736         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 737 }
 738
 739 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 740                           int duration, enum ieee80211_roc_type type)
 741 {
 742         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 743         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 744         struct iwl_time_event_cmd time_cmd = {};
 745
 746         lockdep_assert_held(&mvm->mutex);
 747         if (te_data->running) {
 748                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 749                 return -EBUSY;
 750         }
 751
 752         /*
 753          * Flush the done work, just in case it's still pending, so that
 754          * the work it does can complete and we can accept new frames.
 755          */
 756         flush_work(&mvm->roc_done_wk);
 757
 758         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 759         time_cmd.id_and_color =
 760                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 761
 762         switch (type) {
 763         case IEEE80211_ROC_TYPE_NORMAL:
 764                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 765                 break;
 766         case IEEE80211_ROC_TYPE_MGMT_TX:
 767                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 768                 break;
 769         default:
 770                 WARN_ONCE(1, "Got an invalid ROC type\n");
 771                 return -EINVAL;
 772         }
 773
 774         time_cmd.apply_time = cpu_to_le32(0);
 775         time_cmd.interval = cpu_to_le32(1);
 776
 777         /*
 778          * The P2P Device TEs can have lower priority than other events
 779          * that are being scheduled by the driver/fw, and thus it might not be
 780          * scheduled. To improve the chances of it being scheduled, allow them
 781          * to be fragmented, and in addition allow them to be delayed.
 782          */
 783         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 784         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 785         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 786         time_cmd.repeat = 1;
 787         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 788                                       TE_V2_NOTIF_HOST_EVENT_END |
 789                                       T2_V2_START_IMMEDIATELY);
 790
 791         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 792 }
 793
 794 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 795 {
 796         struct iwl_mvm_vif *mvmvif = NULL;
 797         struct iwl_mvm_time_event_data *te_data;
 798         bool is_p2p = false;
 799
 800         lockdep_assert_held(&mvm->mutex);
 801
 802         spin_lock_bh(&mvm->time_event_lock);
 803
 804         /*
 805          * Iterate over the list of time events and find the time event that is
 806          * associated with a P2P_DEVICE interface.
 807          * This assumes that a P2P_DEVICE interface can have only a single time
 808          * event at any given time and this time event coresponds to a ROC
 809          * request
 810          */
 811         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 812                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 813                         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 814                         is_p2p = true;
 815                         goto remove_te;
 816                 }
 817         }
 818
 819         /* There can only be at most one AUX ROC time event, we just use the
 820          * list to simplify/unify code. Remove it if it exists.
 821          */
 822         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 823                                            struct iwl_mvm_time_event_data,
 824                                            list);
 825         if (te_data)
 826                 mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 827
 828 remove_te:
 829         spin_unlock_bh(&mvm->time_event_lock);
 830
 831         if (!mvmvif) {
 832                 IWL_WARN(mvm, "No remain on channel event\n");
 833                 return;
 834         }
 835
 836         if (is_p2p)
 837                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 838         else
 839                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 840
 841         iwl_mvm_roc_finished(mvm);
 842 }
 843
 844 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 845                                 struct ieee80211_vif *vif,
 846                                 u32 duration, u32 apply_time)
 847 {
 848         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 849         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 850         struct iwl_time_event_cmd time_cmd = {};
 851
 852         lockdep_assert_held(&mvm->mutex);
 853
 854         if (te_data->running) {
 855                 IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 856                 return -EBUSY;
 857         }
 858
 859         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 860         time_cmd.id_and_color =
 861                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 862         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 863         time_cmd.apply_time = cpu_to_le32(apply_time);
 864         time_cmd.max_frags = TE_V2_FRAG_NONE;
 865         time_cmd.duration = cpu_to_le32(duration);
 866         time_cmd.repeat = 1;
 867         time_cmd.interval = cpu_to_le32(1);
 868         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 869                                       TE_V2_ABSENCE);
 870
 871         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 872 }