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
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <linuxwifi@intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  * BSD LICENSE
  30  *
  31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018 Intel Corporation
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  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.
  43  *  * Redistributions in binary form must reproduce the above copyright
  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
  57  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  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         u32 queues = 0;
 102
 103         /*
 104          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 105          * This will cause the TX path to drop offchannel transmissions.
 106          * That would also be done by mac80211, but it is racy, in particular
 107          * in the case that the time event actually completed in the firmware
 108          * (which is handled in iwl_mvm_te_handle_notif).
 109          */
 110         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status)) {
 111                 queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 112                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 113         }
 114         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
 115                 queues |= BIT(mvm->aux_queue);
 116                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 117         }
 118
 119         synchronize_net();
 120
 121         /*
 122          * Flush the offchannel queue -- this is called when the time
 123          * event finishes or is canceled, so that frames queued for it
 124          * won't get stuck on the queue and be transmitted in the next
 125          * time event.
 126          * We have to send the command asynchronously since this cannot
 127          * be under the mutex for locking reasons, but that's not an
 128          * issue as it will have to complete before the next command is
 129          * executed, and a new time event means a new command.
 130          */
 131         iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true, CMD_ASYNC);
 132
 133         /* Do the same for the P2P device queue (STA) */
 134         if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
 135                 struct iwl_mvm_vif *mvmvif;
 136
 137                 /*
 138                  * NB: access to this pointer would be racy, but the flush bit
 139                  * can only be set when we had a P2P-Device VIF, and we have a
 140                  * flush of this work in iwl_mvm_prepare_mac_removal() so it's
 141                  * not really racy.
 142                  */
 143
 144                 if (!WARN_ON(!mvm->p2p_device_vif)) {
 145                         mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
 146                         iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true,
 147                                           CMD_ASYNC);
 148                 }
 149         }
 150 }
 151
 152 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 153 {
 154         /*
 155          * Of course, our status bit is just as racy as mac80211, so in
 156          * addition, fire off the work struct which will drop all frames
 157          * from the hardware queues that made it through the race. First
 158          * it will of course synchronize the TX path to make sure that
 159          * any *new* TX will be rejected.
 160          */
 161         schedule_work(&mvm->roc_done_wk);
 162 }
 163
 164 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 165 {
 166         struct ieee80211_vif *csa_vif;
 167
 168         rcu_read_lock();
 169
 170         csa_vif = rcu_dereference(mvm->csa_vif);
 171         if (!csa_vif || !csa_vif->csa_active)
 172                 goto out_unlock;
 173
 174         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 175
 176         /*
 177          * CSA NoA is started but we still have beacons to
 178          * transmit on the current channel.
 179          * So we just do nothing here and the switch
 180          * will be performed on the last TBTT.
 181          */
 182         if (!ieee80211_csa_is_complete(csa_vif)) {
 183                 IWL_WARN(mvm, "CSA NOA started too early\n");
 184                 goto out_unlock;
 185         }
 186
 187         ieee80211_csa_finish(csa_vif);
 188
 189         rcu_read_unlock();
 190
 191         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 192
 193         return;
 194
 195 out_unlock:
 196         rcu_read_unlock();
 197 }
 198
 199 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 200                                         struct ieee80211_vif *vif,
 201                                         const char *errmsg)
 202 {
 203         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 204
 205         if (vif->type != NL80211_IFTYPE_STATION)
 206                 return false;
 207
 208         if (!mvmvif->csa_bcn_pending && vif->bss_conf.assoc &&
 209             vif->bss_conf.dtim_period)
 210                 return false;
 211         if (errmsg)
 212                 IWL_ERR(mvm, "%s\n", errmsg);
 213
 214         iwl_mvm_connection_loss(mvm, vif, errmsg);
 215         return true;
 216 }
 217
 218 static void
 219 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 220                              struct iwl_mvm_time_event_data *te_data,
 221                              struct iwl_time_event_notif *notif)
 222 {
 223         struct ieee80211_vif *vif = te_data->vif;
 224         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 225
 226         if (!notif->status)
 227                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 228
 229         switch (te_data->vif->type) {
 230         case NL80211_IFTYPE_AP:
 231                 if (!notif->status)
 232                         mvmvif->csa_failed = true;
 233                 iwl_mvm_csa_noa_start(mvm);
 234                 break;
 235         case NL80211_IFTYPE_STATION:
 236                 if (!notif->status) {
 237                         iwl_mvm_connection_loss(mvm, vif,
 238                                                 "CSA TE failed to start");
 239                         break;
 240                 }
 241                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 242                 ieee80211_chswitch_done(te_data->vif, true);
 243                 break;
 244         default:
 245                 /* should never happen */
 246                 WARN_ON_ONCE(1);
 247                 break;
 248         }
 249
 250         /* we don't need it anymore */
 251         iwl_mvm_te_clear_data(mvm, te_data);
 252 }
 253
 254 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 255                                      struct iwl_time_event_notif *notif,
 256                                      struct iwl_mvm_time_event_data *te_data)
 257 {
 258         struct iwl_fw_dbg_trigger_tlv *trig;
 259         struct iwl_fw_dbg_trigger_time_event *te_trig;
 260         int i;
 261
 262         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 263                 return;
 264
 265         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 266         te_trig = (void *)trig->data;
 267
 268         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 269                                            ieee80211_vif_to_wdev(te_data->vif),
 270                                            trig))
 271                 return;
 272
 273         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 274                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 275                 u32 trig_action_bitmap =
 276                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 277                 u32 trig_status_bitmap =
 278                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 279
 280                 if (trig_te_id != te_data->id ||
 281                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 282                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 283                         continue;
 284
 285                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 286                                         "Time event %d Action 0x%x received status: %d",
 287                                         te_data->id,
 288                                         le32_to_cpu(notif->action),
 289                                         le32_to_cpu(notif->status));
 290                 break;
 291         }
 292 }
 293
 294 /*
 295  * Handles a FW notification for an event that is known to the driver.
 296  *
 297  * @mvm: the mvm component
 298  * @te_data: the time event data
 299  * @notif: the notification data corresponding the time event data.
 300  */
 301 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 302                                     struct iwl_mvm_time_event_data *te_data,
 303                                     struct iwl_time_event_notif *notif)
 304 {
 305         lockdep_assert_held(&mvm->time_event_lock);
 306
 307         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 308                      le32_to_cpu(notif->unique_id),
 309                      le32_to_cpu(notif->action));
 310
 311         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 312
 313         /*
 314          * The FW sends the start/end time event notifications even for events
 315          * that it fails to schedule. This is indicated in the status field of
 316          * the notification. This happens in cases that the scheduler cannot
 317          * find a schedule that can handle the event (for example requesting a
 318          * P2P Device discoveribility, while there are other higher priority
 319          * events in the system).
 320          */
 321         if (!le32_to_cpu(notif->status)) {
 322                 const char *msg;
 323
 324                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 325                         msg = "Time Event start notification failure";
 326                 else
 327                         msg = "Time Event end notification failure";
 328
 329                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 330
 331                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 332                         iwl_mvm_te_clear_data(mvm, te_data);
 333                         return;
 334                 }
 335         }
 336
 337         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 338                 IWL_DEBUG_TE(mvm,
 339                              "TE ended - current time %lu, estimated end %lu\n",
 340                              jiffies, te_data->end_jiffies);
 341
 342                 switch (te_data->vif->type) {
 343                 case NL80211_IFTYPE_P2P_DEVICE:
 344                         ieee80211_remain_on_channel_expired(mvm->hw);
 345                         iwl_mvm_roc_finished(mvm);
 346                         break;
 347                 case NL80211_IFTYPE_STATION:
 348                         /*
 349                          * By now, we should have finished association
 350                          * and know the dtim period.
 351                          */
 352                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 353                                 "No beacon heard and the time event is over already...");
 354                         break;
 355                 default:
 356                         break;
 357                 }
 358
 359                 iwl_mvm_te_clear_data(mvm, te_data);
 360         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 361                 te_data->running = true;
 362                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 363
 364                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 365                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 366                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 367                         ieee80211_ready_on_channel(mvm->hw);
 368                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 369                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 370                 }
 371         } else {
 372                 IWL_WARN(mvm, "Got TE with unknown action\n");
 373         }
 374 }
 375
 376 /*
 377  * Handle A Aux ROC time event
 378  */
 379 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 380                                            struct iwl_time_event_notif *notif)
 381 {
 382         struct iwl_mvm_time_event_data *te_data, *tmp;
 383         bool aux_roc_te = false;
 384
 385         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 386                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 387                         aux_roc_te = true;
 388                         break;
 389                 }
 390         }
 391         if (!aux_roc_te) /* Not a Aux ROC time event */
 392                 return -EINVAL;
 393
 394         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 395
 396         IWL_DEBUG_TE(mvm,
 397                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 398                      le32_to_cpu(notif->unique_id),
 399                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 400
 401         if (!le32_to_cpu(notif->status) ||
 402             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 403                 /* End TE, notify mac80211 */
 404                 ieee80211_remain_on_channel_expired(mvm->hw);
 405                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 406                 list_del(&te_data->list); /* remove from list */
 407                 te_data->running = false;
 408                 te_data->vif = NULL;
 409                 te_data->uid = 0;
 410                 te_data->id = TE_MAX;
 411         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 412                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 413                 te_data->running = true;
 414                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 415                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 416         } else {
 417                 IWL_DEBUG_TE(mvm,
 418                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 419                              le32_to_cpu(notif->action));
 420                 return -EINVAL;
 421         }
 422
 423         return 0;
 424 }
 425
 426 /*
 427  * The Rx handler for time event notifications
 428  */
 429 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 430                                  struct iwl_rx_cmd_buffer *rxb)
 431 {
 432         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 433         struct iwl_time_event_notif *notif = (void *)pkt->data;
 434         struct iwl_mvm_time_event_data *te_data, *tmp;
 435
 436         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 437                      le32_to_cpu(notif->unique_id),
 438                      le32_to_cpu(notif->action));
 439
 440         spin_lock_bh(&mvm->time_event_lock);
 441         /* This time event is triggered for Aux ROC request */
 442         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 443                 goto unlock;
 444
 445         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 446                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 447                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 448         }
 449 unlock:
 450         spin_unlock_bh(&mvm->time_event_lock);
 451 }
 452
 453 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 454                              struct iwl_rx_packet *pkt, void *data)
 455 {
 456         struct iwl_mvm *mvm =
 457                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 458         struct iwl_mvm_time_event_data *te_data = data;
 459         struct iwl_time_event_notif *resp;
 460         int resp_len = iwl_rx_packet_payload_len(pkt);
 461
 462         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 463                 return true;
 464
 465         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 466                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 467                 return true;
 468         }
 469
 470         resp = (void *)pkt->data;
 471
 472         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 473         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 474                 return false;
 475
 476         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 477                      te_data->uid);
 478         if (!resp->status)
 479                 IWL_ERR(mvm,
 480                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 481
 482         return true;
 483 }
 484
 485 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 486                                         struct iwl_rx_packet *pkt, void *data)
 487 {
 488         struct iwl_mvm *mvm =
 489                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 490         struct iwl_mvm_time_event_data *te_data = data;
 491         struct iwl_time_event_resp *resp;
 492         int resp_len = iwl_rx_packet_payload_len(pkt);
 493
 494         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 495                 return true;
 496
 497         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 498                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 499                 return true;
 500         }
 501
 502         resp = (void *)pkt->data;
 503
 504         /* we should never get a response to another TIME_EVENT_CMD here */
 505         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 506                 return false;
 507
 508         te_data->uid = le32_to_cpu(resp->unique_id);
 509         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 510                      te_data->uid);
 511         return true;
 512 }
 513
 514 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 515                                        struct ieee80211_vif *vif,
 516                                        struct iwl_mvm_time_event_data *te_data,
 517                                        struct iwl_time_event_cmd *te_cmd)
 518 {
 519         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 520         struct iwl_notification_wait wait_time_event;
 521         int ret;
 522
 523         lockdep_assert_held(&mvm->mutex);
 524
 525         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 526                      le32_to_cpu(te_cmd->duration));
 527
 528         spin_lock_bh(&mvm->time_event_lock);
 529         if (WARN_ON(te_data->id != TE_MAX)) {
 530                 spin_unlock_bh(&mvm->time_event_lock);
 531                 return -EIO;
 532         }
 533         te_data->vif = vif;
 534         te_data->duration = le32_to_cpu(te_cmd->duration);
 535         te_data->id = le32_to_cpu(te_cmd->id);
 536         list_add_tail(&te_data->list, &mvm->time_event_list);
 537         spin_unlock_bh(&mvm->time_event_lock);
 538
 539         /*
 540          * Use a notification wait, which really just processes the
 541          * command response and doesn't wait for anything, in order
 542          * to be able to process the response and get the UID inside
 543          * the RX path. Using CMD_WANT_SKB doesn't work because it
 544          * stores the buffer and then wakes up this thread, by which
 545          * time another notification (that the time event started)
 546          * might already be processed unsuccessfully.
 547          */
 548         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 549                                    time_event_response,
 550                                    ARRAY_SIZE(time_event_response),
 551                                    iwl_mvm_time_event_response, te_data);
 552
 553         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 554                                             sizeof(*te_cmd), te_cmd);
 555         if (ret) {
 556                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 557                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 558                 goto out_clear_te;
 559         }
 560
 561         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 562         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 563         /* should never fail */
 564         WARN_ON_ONCE(ret);
 565
 566         if (ret) {
 567  out_clear_te:
 568                 spin_lock_bh(&mvm->time_event_lock);
 569                 iwl_mvm_te_clear_data(mvm, te_data);
 570                 spin_unlock_bh(&mvm->time_event_lock);
 571         }
 572         return ret;
 573 }
 574
 575 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 576                              struct ieee80211_vif *vif,
 577                              u32 duration, u32 min_duration,
 578                              u32 max_delay, bool wait_for_notif)
 579 {
 580         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 581         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 582         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 583         struct iwl_notification_wait wait_te_notif;
 584         struct iwl_time_event_cmd time_cmd = {};
 585
 586         lockdep_assert_held(&mvm->mutex);
 587
 588         if (te_data->running &&
 589             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 590                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 591                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 592                 return;
 593         }
 594
 595         if (te_data->running) {
 596                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 597                              te_data->uid,
 598                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 599                 /*
 600                  * we don't have enough time
 601                  * cancel the current TE and issue a new one
 602                  * Of course it would be better to remove the old one only
 603                  * when the new one is added, but we don't care if we are off
 604                  * channel for a bit. All we need to do, is not to return
 605                  * before we actually begin to be on the channel.
 606                  */
 607                 iwl_mvm_stop_session_protection(mvm, vif);
 608         }
 609
 610         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 611         time_cmd.id_and_color =
 612                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 613         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 614
 615         time_cmd.apply_time = cpu_to_le32(0);
 616
 617         time_cmd.max_frags = TE_V2_FRAG_NONE;
 618         time_cmd.max_delay = cpu_to_le32(max_delay);
 619         /* TODO: why do we need to interval = bi if it is not periodic? */
 620         time_cmd.interval = cpu_to_le32(1);
 621         time_cmd.duration = cpu_to_le32(duration);
 622         time_cmd.repeat = 1;
 623         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 624                                       TE_V2_NOTIF_HOST_EVENT_END |
 625                                       TE_V2_START_IMMEDIATELY);
 626
 627         if (!wait_for_notif) {
 628                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 629                 return;
 630         }
 631
 632         /*
 633          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 634          * right after we send the time event
 635          */
 636         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 637                                    te_notif_response,
 638                                    ARRAY_SIZE(te_notif_response),
 639                                    iwl_mvm_te_notif, te_data);
 640
 641         /* If TE was sent OK - wait for the notification that started */
 642         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 643                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 644                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 645         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 646                                          TU_TO_JIFFIES(max_delay))) {
 647                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 648         }
 649 }
 650
 651 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 652                                         struct iwl_mvm_time_event_data *te_data,
 653                                         u32 *uid)
 654 {
 655         u32 id;
 656
 657         /*
 658          * It is possible that by the time we got to this point the time
 659          * event was already removed.
 660          */
 661         spin_lock_bh(&mvm->time_event_lock);
 662
 663         /* Save time event uid before clearing its data */
 664         *uid = te_data->uid;
 665         id = te_data->id;
 666
 667         /*
 668          * The clear_data function handles time events that were already removed
 669          */
 670         iwl_mvm_te_clear_data(mvm, te_data);
 671         spin_unlock_bh(&mvm->time_event_lock);
 672
 673         /*
 674          * It is possible that by the time we try to remove it, the time event
 675          * has already ended and removed. In such a case there is no need to
 676          * send a removal command.
 677          */
 678         if (id == TE_MAX) {
 679                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 680                 return false;
 681         }
 682
 683         return true;
 684 }
 685
 686 /*
 687  * Explicit request to remove a aux roc time event. The removal of a time
 688  * event needs to be synchronized with the flow of a time event's end
 689  * notification, which also removes the time event from the op mode
 690  * data structures.
 691  */
 692 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 693                                       struct iwl_mvm_vif *mvmvif,
 694                                       struct iwl_mvm_time_event_data *te_data)
 695 {
 696         struct iwl_hs20_roc_req aux_cmd = {};
 697         u32 uid;
 698         int ret;
 699
 700         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 701                 return;
 702
 703         aux_cmd.event_unique_id = cpu_to_le32(uid);
 704         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 705         aux_cmd.id_and_color =
 706                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 707         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 708                      le32_to_cpu(aux_cmd.event_unique_id));
 709         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 710                                    sizeof(aux_cmd), &aux_cmd);
 711
 712         if (WARN_ON(ret))
 713                 return;
 714 }
 715
 716 /*
 717  * Explicit request to remove a time event. The removal of a time event needs to
 718  * be synchronized with the flow of a time event's end notification, which also
 719  * removes the time event from the op mode data structures.
 720  */
 721 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 722                                struct iwl_mvm_vif *mvmvif,
 723                                struct iwl_mvm_time_event_data *te_data)
 724 {
 725         struct iwl_time_event_cmd time_cmd = {};
 726         u32 uid;
 727         int ret;
 728
 729         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 730                 return;
 731
 732         /* When we remove a TE, the UID is to be set in the id field */
 733         time_cmd.id = cpu_to_le32(uid);
 734         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 735         time_cmd.id_and_color =
 736                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 737
 738         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 739         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 740                                    sizeof(time_cmd), &time_cmd);
 741         if (WARN_ON(ret))
 742                 return;
 743 }
 744
 745 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 746                                      struct ieee80211_vif *vif)
 747 {
 748         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 749         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 750         u32 id;
 751
 752         lockdep_assert_held(&mvm->mutex);
 753
 754         spin_lock_bh(&mvm->time_event_lock);
 755         id = te_data->id;
 756         spin_unlock_bh(&mvm->time_event_lock);
 757
 758         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 759                 IWL_DEBUG_TE(mvm,
 760                              "don't remove TE with id=%u (not session protection)\n",
 761                              id);
 762                 return;
 763         }
 764
 765         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 766 }
 767
 768 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 769                           int duration, enum ieee80211_roc_type type)
 770 {
 771         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 772         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 773         struct iwl_time_event_cmd time_cmd = {};
 774
 775         lockdep_assert_held(&mvm->mutex);
 776         if (te_data->running) {
 777                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 778                 return -EBUSY;
 779         }
 780
 781         /*
 782          * Flush the done work, just in case it's still pending, so that
 783          * the work it does can complete and we can accept new frames.
 784          */
 785         flush_work(&mvm->roc_done_wk);
 786
 787         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 788         time_cmd.id_and_color =
 789                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 790
 791         switch (type) {
 792         case IEEE80211_ROC_TYPE_NORMAL:
 793                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 794                 break;
 795         case IEEE80211_ROC_TYPE_MGMT_TX:
 796                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 797                 break;
 798         default:
 799                 WARN_ONCE(1, "Got an invalid ROC type\n");
 800                 return -EINVAL;
 801         }
 802
 803         time_cmd.apply_time = cpu_to_le32(0);
 804         time_cmd.interval = cpu_to_le32(1);
 805
 806         /*
 807          * The P2P Device TEs can have lower priority than other events
 808          * that are being scheduled by the driver/fw, and thus it might not be
 809          * scheduled. To improve the chances of it being scheduled, allow them
 810          * to be fragmented, and in addition allow them to be delayed.
 811          */
 812         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 813         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 814         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 815         time_cmd.repeat = 1;
 816         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 817                                       TE_V2_NOTIF_HOST_EVENT_END |
 818                                       TE_V2_START_IMMEDIATELY);
 819
 820         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 821 }
 822
 823 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 824 {
 825         struct iwl_mvm_time_event_data *te_data;
 826
 827         lockdep_assert_held(&mvm->mutex);
 828
 829         spin_lock_bh(&mvm->time_event_lock);
 830
 831         /*
 832          * Iterate over the list of time events and find the time event that is
 833          * associated with a P2P_DEVICE interface.
 834          * This assumes that a P2P_DEVICE interface can have only a single time
 835          * event at any given time and this time event coresponds to a ROC
 836          * request
 837          */
 838         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 839                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 840                         goto out;
 841         }
 842
 843         /* There can only be at most one AUX ROC time event, we just use the
 844          * list to simplify/unify code. Remove it if it exists.
 845          */
 846         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 847                                            struct iwl_mvm_time_event_data,
 848                                            list);
 849 out:
 850         spin_unlock_bh(&mvm->time_event_lock);
 851         return te_data;
 852 }
 853
 854 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 855 {
 856         struct iwl_mvm_time_event_data *te_data;
 857         u32 uid;
 858
 859         te_data = iwl_mvm_get_roc_te(mvm);
 860         if (te_data)
 861                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 862 }
 863
 864 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 865 {
 866         struct iwl_mvm_vif *mvmvif;
 867         struct iwl_mvm_time_event_data *te_data;
 868
 869         te_data = iwl_mvm_get_roc_te(mvm);
 870         if (!te_data) {
 871                 IWL_WARN(mvm, "No remain on channel event\n");
 872                 return;
 873         }
 874
 875         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 876
 877         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 878                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 879                 set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 880         } else {
 881                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 882         }
 883
 884         iwl_mvm_roc_finished(mvm);
 885 }
 886
 887 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 888                                 struct ieee80211_vif *vif,
 889                                 u32 duration, u32 apply_time)
 890 {
 891         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 892         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 893         struct iwl_time_event_cmd time_cmd = {};
 894
 895         lockdep_assert_held(&mvm->mutex);
 896
 897         if (te_data->running) {
 898                 u32 id;
 899
 900                 spin_lock_bh(&mvm->time_event_lock);
 901                 id = te_data->id;
 902                 spin_unlock_bh(&mvm->time_event_lock);
 903
 904                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 905                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 906                         return -EBUSY;
 907                 }
 908
 909                 /*
 910                  * Remove the session protection time event to allow the
 911                  * channel switch. If we got here, we just heard a beacon so
 912                  * the session protection is not needed anymore anyway.
 913                  */
 914                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 915         }
 916
 917         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 918         time_cmd.id_and_color =
 919                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 920         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 921         time_cmd.apply_time = cpu_to_le32(apply_time);
 922         time_cmd.max_frags = TE_V2_FRAG_NONE;
 923         time_cmd.duration = cpu_to_le32(duration);
 924         time_cmd.repeat = 1;
 925         time_cmd.interval = cpu_to_le32(1);
 926         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 927                                       TE_V2_ABSENCE);
 928         if (!apply_time)
 929                 time_cmd.policy |= cpu_to_le16(TE_V2_START_IMMEDIATELY);
 930
 931         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 932 }