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  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
  26  * The full GNU General Public License is included in this distribution
  27  * in the file called COPYING.
  28  *
  29  * Contact Information:
  30  *  Intel Linux Wireless <linuxwifi@intel.com>
  31  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  32  *
  33  * BSD LICENSE
  34  *
  35  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  36  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  37  * Copyright(c) 2017 Intel Deutschland GmbH
  38  * All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  *
  44  *  * Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  *  * Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in
  48  *    the documentation and/or other materials provided with the
  49  *    distribution.
  50  *  * Neither the name Intel Corporation nor the names of its
  51  *    contributors may be used to endorse or promote products derived
  52  *    from this software without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  55  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  56  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  57  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  58  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  59  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  60  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  61  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  62  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  63  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  64  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  65  *
  66  *****************************************************************************/
  67
  68 #include <linux/jiffies.h>
  69 #include <net/mac80211.h>
  70
  71 #include "fw/notif-wait.h"
  72 #include "iwl-trans.h"
  73 #include "fw-api.h"
  74 #include "time-event.h"
  75 #include "mvm.h"
  76 #include "iwl-io.h"
  77 #include "iwl-prph.h"
  78
  79 /*
  80  * For the high priority TE use a time event type that has similar priority to
  81  * the FW's action scan priority.
  82  */
  83 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
  84 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
  85
  86 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
  87                            struct iwl_mvm_time_event_data *te_data)
  88 {
  89         lockdep_assert_held(&mvm->time_event_lock);
  90
  91         if (!te_data->vif)
  92                 return;
  93
  94         list_del(&te_data->list);
  95         te_data->running = false;
  96         te_data->uid = 0;
  97         te_data->id = TE_MAX;
  98         te_data->vif = NULL;
  99 }
 100
 101 void iwl_mvm_roc_done_wk(struct work_struct *wk)
 102 {
 103         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
 104         u32 queues = 0;
 105
 106         /*
 107          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
 108          * This will cause the TX path to drop offchannel transmissions.
 109          * That would also be done by mac80211, but it is racy, in particular
 110          * in the case that the time event actually completed in the firmware
 111          * (which is handled in iwl_mvm_te_handle_notif).
 112          */
 113         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status)) {
 114                 queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
 115                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
 116         }
 117         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status)) {
 118                 queues |= BIT(mvm->aux_queue);
 119                 iwl_mvm_unref(mvm, IWL_MVM_REF_ROC_AUX);
 120         }
 121
 122         synchronize_net();
 123
 124         /*
 125          * Flush the offchannel queue -- this is called when the time
 126          * event finishes or is canceled, so that frames queued for it
 127          * won't get stuck on the queue and be transmitted in the next
 128          * time event.
 129          * We have to send the command asynchronously since this cannot
 130          * be under the mutex for locking reasons, but that's not an
 131          * issue as it will have to complete before the next command is
 132          * executed, and a new time event means a new command.
 133          */
 134         iwl_mvm_flush_sta(mvm, &mvm->aux_sta, true, CMD_ASYNC);
 135 }
 136
 137 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 138 {
 139         /*
 140          * Of course, our status bit is just as racy as mac80211, so in
 141          * addition, fire off the work struct which will drop all frames
 142          * from the hardware queues that made it through the race. First
 143          * it will of course synchronize the TX path to make sure that
 144          * any *new* TX will be rejected.
 145          */
 146         schedule_work(&mvm->roc_done_wk);
 147 }
 148
 149 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 150 {
 151         struct ieee80211_vif *csa_vif;
 152
 153         rcu_read_lock();
 154
 155         csa_vif = rcu_dereference(mvm->csa_vif);
 156         if (!csa_vif || !csa_vif->csa_active)
 157                 goto out_unlock;
 158
 159         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 160
 161         /*
 162          * CSA NoA is started but we still have beacons to
 163          * transmit on the current channel.
 164          * So we just do nothing here and the switch
 165          * will be performed on the last TBTT.
 166          */
 167         if (!ieee80211_csa_is_complete(csa_vif)) {
 168                 IWL_WARN(mvm, "CSA NOA started too early\n");
 169                 goto out_unlock;
 170         }
 171
 172         ieee80211_csa_finish(csa_vif);
 173
 174         rcu_read_unlock();
 175
 176         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 177
 178         return;
 179
 180 out_unlock:
 181         rcu_read_unlock();
 182 }
 183
 184 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 185                                         struct ieee80211_vif *vif,
 186                                         const char *errmsg)
 187 {
 188         if (vif->type != NL80211_IFTYPE_STATION)
 189                 return false;
 190         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 191                 return false;
 192         if (errmsg)
 193                 IWL_ERR(mvm, "%s\n", errmsg);
 194
 195         iwl_mvm_connection_loss(mvm, vif, errmsg);
 196         return true;
 197 }
 198
 199 static void
 200 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 201                              struct iwl_mvm_time_event_data *te_data,
 202                              struct iwl_time_event_notif *notif)
 203 {
 204         struct ieee80211_vif *vif = te_data->vif;
 205         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 206
 207         if (!notif->status)
 208                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 209
 210         switch (te_data->vif->type) {
 211         case NL80211_IFTYPE_AP:
 212                 if (!notif->status)
 213                         mvmvif->csa_failed = true;
 214                 iwl_mvm_csa_noa_start(mvm);
 215                 break;
 216         case NL80211_IFTYPE_STATION:
 217                 if (!notif->status) {
 218                         iwl_mvm_connection_loss(mvm, vif,
 219                                                 "CSA TE failed to start");
 220                         break;
 221                 }
 222                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 223                 ieee80211_chswitch_done(te_data->vif, true);
 224                 break;
 225         default:
 226                 /* should never happen */
 227                 WARN_ON_ONCE(1);
 228                 break;
 229         }
 230
 231         /* we don't need it anymore */
 232         iwl_mvm_te_clear_data(mvm, te_data);
 233 }
 234
 235 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 236                                      struct iwl_time_event_notif *notif,
 237                                      struct iwl_mvm_time_event_data *te_data)
 238 {
 239         struct iwl_fw_dbg_trigger_tlv *trig;
 240         struct iwl_fw_dbg_trigger_time_event *te_trig;
 241         int i;
 242
 243         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 244                 return;
 245
 246         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 247         te_trig = (void *)trig->data;
 248
 249         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 250                                            ieee80211_vif_to_wdev(te_data->vif),
 251                                            trig))
 252                 return;
 253
 254         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 255                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 256                 u32 trig_action_bitmap =
 257                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 258                 u32 trig_status_bitmap =
 259                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 260
 261                 if (trig_te_id != te_data->id ||
 262                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 263                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 264                         continue;
 265
 266                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 267                                         "Time event %d Action 0x%x received status: %d",
 268                                         te_data->id,
 269                                         le32_to_cpu(notif->action),
 270                                         le32_to_cpu(notif->status));
 271                 break;
 272         }
 273 }
 274
 275 /*
 276  * Handles a FW notification for an event that is known to the driver.
 277  *
 278  * @mvm: the mvm component
 279  * @te_data: the time event data
 280  * @notif: the notification data corresponding the time event data.
 281  */
 282 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 283                                     struct iwl_mvm_time_event_data *te_data,
 284                                     struct iwl_time_event_notif *notif)
 285 {
 286         lockdep_assert_held(&mvm->time_event_lock);
 287
 288         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 289                      le32_to_cpu(notif->unique_id),
 290                      le32_to_cpu(notif->action));
 291
 292         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 293
 294         /*
 295          * The FW sends the start/end time event notifications even for events
 296          * that it fails to schedule. This is indicated in the status field of
 297          * the notification. This happens in cases that the scheduler cannot
 298          * find a schedule that can handle the event (for example requesting a
 299          * P2P Device discoveribility, while there are other higher priority
 300          * events in the system).
 301          */
 302         if (!le32_to_cpu(notif->status)) {
 303                 const char *msg;
 304
 305                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 306                         msg = "Time Event start notification failure";
 307                 else
 308                         msg = "Time Event end notification failure";
 309
 310                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 311
 312                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 313                         iwl_mvm_te_clear_data(mvm, te_data);
 314                         return;
 315                 }
 316         }
 317
 318         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 319                 IWL_DEBUG_TE(mvm,
 320                              "TE ended - current time %lu, estimated end %lu\n",
 321                              jiffies, te_data->end_jiffies);
 322
 323                 switch (te_data->vif->type) {
 324                 case NL80211_IFTYPE_P2P_DEVICE:
 325                         ieee80211_remain_on_channel_expired(mvm->hw);
 326                         iwl_mvm_roc_finished(mvm);
 327                         break;
 328                 case NL80211_IFTYPE_STATION:
 329                         /*
 330                          * By now, we should have finished association
 331                          * and know the dtim period.
 332                          */
 333                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 334                                 "No association and the time event is over already...");
 335                         break;
 336                 default:
 337                         break;
 338                 }
 339
 340                 iwl_mvm_te_clear_data(mvm, te_data);
 341         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 342                 te_data->running = true;
 343                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 344
 345                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 346                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 347                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 348                         ieee80211_ready_on_channel(mvm->hw);
 349                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 350                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 351                 }
 352         } else {
 353                 IWL_WARN(mvm, "Got TE with unknown action\n");
 354         }
 355 }
 356
 357 /*
 358  * Handle A Aux ROC time event
 359  */
 360 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 361                                            struct iwl_time_event_notif *notif)
 362 {
 363         struct iwl_mvm_time_event_data *te_data, *tmp;
 364         bool aux_roc_te = false;
 365
 366         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 367                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 368                         aux_roc_te = true;
 369                         break;
 370                 }
 371         }
 372         if (!aux_roc_te) /* Not a Aux ROC time event */
 373                 return -EINVAL;
 374
 375         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 376
 377         IWL_DEBUG_TE(mvm,
 378                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 379                      le32_to_cpu(notif->unique_id),
 380                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 381
 382         if (!le32_to_cpu(notif->status) ||
 383             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 384                 /* End TE, notify mac80211 */
 385                 ieee80211_remain_on_channel_expired(mvm->hw);
 386                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 387                 list_del(&te_data->list); /* remove from list */
 388                 te_data->running = false;
 389                 te_data->vif = NULL;
 390                 te_data->uid = 0;
 391                 te_data->id = TE_MAX;
 392         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 393                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 394                 te_data->running = true;
 395                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 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 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 411                                  struct iwl_rx_cmd_buffer *rxb)
 412 {
 413         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 414         struct iwl_time_event_notif *notif = (void *)pkt->data;
 415         struct iwl_mvm_time_event_data *te_data, *tmp;
 416
 417         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 418                      le32_to_cpu(notif->unique_id),
 419                      le32_to_cpu(notif->action));
 420
 421         spin_lock_bh(&mvm->time_event_lock);
 422         /* This time event is triggered for Aux ROC request */
 423         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 424                 goto unlock;
 425
 426         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 427                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 428                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 429         }
 430 unlock:
 431         spin_unlock_bh(&mvm->time_event_lock);
 432 }
 433
 434 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 435                              struct iwl_rx_packet *pkt, void *data)
 436 {
 437         struct iwl_mvm *mvm =
 438                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 439         struct iwl_mvm_time_event_data *te_data = data;
 440         struct iwl_time_event_notif *resp;
 441         int resp_len = iwl_rx_packet_payload_len(pkt);
 442
 443         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 444                 return true;
 445
 446         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 447                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 448                 return true;
 449         }
 450
 451         resp = (void *)pkt->data;
 452
 453         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 454         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 455                 return false;
 456
 457         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 458                      te_data->uid);
 459         if (!resp->status)
 460                 IWL_ERR(mvm,
 461                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 462
 463         return true;
 464 }
 465
 466 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 467                                         struct iwl_rx_packet *pkt, void *data)
 468 {
 469         struct iwl_mvm *mvm =
 470                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 471         struct iwl_mvm_time_event_data *te_data = data;
 472         struct iwl_time_event_resp *resp;
 473         int resp_len = iwl_rx_packet_payload_len(pkt);
 474
 475         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 476                 return true;
 477
 478         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 479                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 480                 return true;
 481         }
 482
 483         resp = (void *)pkt->data;
 484
 485         /* we should never get a response to another TIME_EVENT_CMD here */
 486         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 487                 return false;
 488
 489         te_data->uid = le32_to_cpu(resp->unique_id);
 490         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 491                      te_data->uid);
 492         return true;
 493 }
 494
 495 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 496                                        struct ieee80211_vif *vif,
 497                                        struct iwl_mvm_time_event_data *te_data,
 498                                        struct iwl_time_event_cmd *te_cmd)
 499 {
 500         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 501         struct iwl_notification_wait wait_time_event;
 502         int ret;
 503
 504         lockdep_assert_held(&mvm->mutex);
 505
 506         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 507                      le32_to_cpu(te_cmd->duration));
 508
 509         spin_lock_bh(&mvm->time_event_lock);
 510         if (WARN_ON(te_data->id != TE_MAX)) {
 511                 spin_unlock_bh(&mvm->time_event_lock);
 512                 return -EIO;
 513         }
 514         te_data->vif = vif;
 515         te_data->duration = le32_to_cpu(te_cmd->duration);
 516         te_data->id = le32_to_cpu(te_cmd->id);
 517         list_add_tail(&te_data->list, &mvm->time_event_list);
 518         spin_unlock_bh(&mvm->time_event_lock);
 519
 520         /*
 521          * Use a notification wait, which really just processes the
 522          * command response and doesn't wait for anything, in order
 523          * to be able to process the response and get the UID inside
 524          * the RX path. Using CMD_WANT_SKB doesn't work because it
 525          * stores the buffer and then wakes up this thread, by which
 526          * time another notification (that the time event started)
 527          * might already be processed unsuccessfully.
 528          */
 529         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 530                                    time_event_response,
 531                                    ARRAY_SIZE(time_event_response),
 532                                    iwl_mvm_time_event_response, te_data);
 533
 534         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 535                                             sizeof(*te_cmd), te_cmd);
 536         if (ret) {
 537                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 538                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 539                 goto out_clear_te;
 540         }
 541
 542         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 543         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 544         /* should never fail */
 545         WARN_ON_ONCE(ret);
 546
 547         if (ret) {
 548  out_clear_te:
 549                 spin_lock_bh(&mvm->time_event_lock);
 550                 iwl_mvm_te_clear_data(mvm, te_data);
 551                 spin_unlock_bh(&mvm->time_event_lock);
 552         }
 553         return ret;
 554 }
 555
 556 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 557                              struct ieee80211_vif *vif,
 558                              u32 duration, u32 min_duration,
 559                              u32 max_delay, bool wait_for_notif)
 560 {
 561         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 562         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 563         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 564         struct iwl_notification_wait wait_te_notif;
 565         struct iwl_time_event_cmd time_cmd = {};
 566
 567         lockdep_assert_held(&mvm->mutex);
 568
 569         if (te_data->running &&
 570             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 571                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 572                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 573                 return;
 574         }
 575
 576         if (te_data->running) {
 577                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 578                              te_data->uid,
 579                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 580                 /*
 581                  * we don't have enough time
 582                  * cancel the current TE and issue a new one
 583                  * Of course it would be better to remove the old one only
 584                  * when the new one is added, but we don't care if we are off
 585                  * channel for a bit. All we need to do, is not to return
 586                  * before we actually begin to be on the channel.
 587                  */
 588                 iwl_mvm_stop_session_protection(mvm, vif);
 589         }
 590
 591         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 592         time_cmd.id_and_color =
 593                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 594         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 595
 596         time_cmd.apply_time = cpu_to_le32(0);
 597
 598         time_cmd.max_frags = TE_V2_FRAG_NONE;
 599         time_cmd.max_delay = cpu_to_le32(max_delay);
 600         /* TODO: why do we need to interval = bi if it is not periodic? */
 601         time_cmd.interval = cpu_to_le32(1);
 602         time_cmd.duration = cpu_to_le32(duration);
 603         time_cmd.repeat = 1;
 604         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 605                                       TE_V2_NOTIF_HOST_EVENT_END |
 606                                       T2_V2_START_IMMEDIATELY);
 607
 608         if (!wait_for_notif) {
 609                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 610                 return;
 611         }
 612
 613         /*
 614          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 615          * right after we send the time event
 616          */
 617         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 618                                    te_notif_response,
 619                                    ARRAY_SIZE(te_notif_response),
 620                                    iwl_mvm_te_notif, te_data);
 621
 622         /* If TE was sent OK - wait for the notification that started */
 623         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 624                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 625                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 626         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 627                                          TU_TO_JIFFIES(max_delay))) {
 628                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 629         }
 630 }
 631
 632 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 633                                         struct iwl_mvm_time_event_data *te_data,
 634                                         u32 *uid)
 635 {
 636         u32 id;
 637
 638         /*
 639          * It is possible that by the time we got to this point the time
 640          * event was already removed.
 641          */
 642         spin_lock_bh(&mvm->time_event_lock);
 643
 644         /* Save time event uid before clearing its data */
 645         *uid = te_data->uid;
 646         id = te_data->id;
 647
 648         /*
 649          * The clear_data function handles time events that were already removed
 650          */
 651         iwl_mvm_te_clear_data(mvm, te_data);
 652         spin_unlock_bh(&mvm->time_event_lock);
 653
 654         /*
 655          * It is possible that by the time we try to remove it, the time event
 656          * has already ended and removed. In such a case there is no need to
 657          * send a removal command.
 658          */
 659         if (id == TE_MAX) {
 660                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 661                 return false;
 662         }
 663
 664         return true;
 665 }
 666
 667 /*
 668  * Explicit request to remove a aux roc time event. The removal of a time
 669  * event needs to be synchronized with the flow of a time event's end
 670  * notification, which also removes the time event from the op mode
 671  * data structures.
 672  */
 673 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 674                                       struct iwl_mvm_vif *mvmvif,
 675                                       struct iwl_mvm_time_event_data *te_data)
 676 {
 677         struct iwl_hs20_roc_req aux_cmd = {};
 678         u32 uid;
 679         int ret;
 680
 681         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 682                 return;
 683
 684         aux_cmd.event_unique_id = cpu_to_le32(uid);
 685         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 686         aux_cmd.id_and_color =
 687                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 688         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 689                      le32_to_cpu(aux_cmd.event_unique_id));
 690         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 691                                    sizeof(aux_cmd), &aux_cmd);
 692
 693         if (WARN_ON(ret))
 694                 return;
 695 }
 696
 697 /*
 698  * Explicit request to remove a time event. The removal of a time event needs to
 699  * be synchronized with the flow of a time event's end notification, which also
 700  * removes the time event from the op mode data structures.
 701  */
 702 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 703                                struct iwl_mvm_vif *mvmvif,
 704                                struct iwl_mvm_time_event_data *te_data)
 705 {
 706         struct iwl_time_event_cmd time_cmd = {};
 707         u32 uid;
 708         int ret;
 709
 710         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 711                 return;
 712
 713         /* When we remove a TE, the UID is to be set in the id field */
 714         time_cmd.id = cpu_to_le32(uid);
 715         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 716         time_cmd.id_and_color =
 717                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 718
 719         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 720         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 721                                    sizeof(time_cmd), &time_cmd);
 722         if (WARN_ON(ret))
 723                 return;
 724 }
 725
 726 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 727                                      struct ieee80211_vif *vif)
 728 {
 729         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 730         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 731         u32 id;
 732
 733         lockdep_assert_held(&mvm->mutex);
 734
 735         spin_lock_bh(&mvm->time_event_lock);
 736         id = te_data->id;
 737         spin_unlock_bh(&mvm->time_event_lock);
 738
 739         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 740                 IWL_DEBUG_TE(mvm,
 741                              "don't remove TE with id=%u (not session protection)\n",
 742                              id);
 743                 return;
 744         }
 745
 746         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 747 }
 748
 749 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 750                           int duration, enum ieee80211_roc_type type)
 751 {
 752         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 753         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 754         struct iwl_time_event_cmd time_cmd = {};
 755
 756         lockdep_assert_held(&mvm->mutex);
 757         if (te_data->running) {
 758                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 759                 return -EBUSY;
 760         }
 761
 762         /*
 763          * Flush the done work, just in case it's still pending, so that
 764          * the work it does can complete and we can accept new frames.
 765          */
 766         flush_work(&mvm->roc_done_wk);
 767
 768         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 769         time_cmd.id_and_color =
 770                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 771
 772         switch (type) {
 773         case IEEE80211_ROC_TYPE_NORMAL:
 774                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 775                 break;
 776         case IEEE80211_ROC_TYPE_MGMT_TX:
 777                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 778                 break;
 779         default:
 780                 WARN_ONCE(1, "Got an invalid ROC type\n");
 781                 return -EINVAL;
 782         }
 783
 784         time_cmd.apply_time = cpu_to_le32(0);
 785         time_cmd.interval = cpu_to_le32(1);
 786
 787         /*
 788          * The P2P Device TEs can have lower priority than other events
 789          * that are being scheduled by the driver/fw, and thus it might not be
 790          * scheduled. To improve the chances of it being scheduled, allow them
 791          * to be fragmented, and in addition allow them to be delayed.
 792          */
 793         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 794         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 795         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 796         time_cmd.repeat = 1;
 797         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 798                                       TE_V2_NOTIF_HOST_EVENT_END |
 799                                       T2_V2_START_IMMEDIATELY);
 800
 801         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 802 }
 803
 804 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 805 {
 806         struct iwl_mvm_time_event_data *te_data;
 807
 808         lockdep_assert_held(&mvm->mutex);
 809
 810         spin_lock_bh(&mvm->time_event_lock);
 811
 812         /*
 813          * Iterate over the list of time events and find the time event that is
 814          * associated with a P2P_DEVICE interface.
 815          * This assumes that a P2P_DEVICE interface can have only a single time
 816          * event at any given time and this time event coresponds to a ROC
 817          * request
 818          */
 819         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 820                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 821                         goto out;
 822         }
 823
 824         /* There can only be at most one AUX ROC time event, we just use the
 825          * list to simplify/unify code. Remove it if it exists.
 826          */
 827         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 828                                            struct iwl_mvm_time_event_data,
 829                                            list);
 830 out:
 831         spin_unlock_bh(&mvm->time_event_lock);
 832         return te_data;
 833 }
 834
 835 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 836 {
 837         struct iwl_mvm_time_event_data *te_data;
 838         u32 uid;
 839
 840         te_data = iwl_mvm_get_roc_te(mvm);
 841         if (te_data)
 842                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 843 }
 844
 845 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 846 {
 847         struct iwl_mvm_vif *mvmvif;
 848         struct iwl_mvm_time_event_data *te_data;
 849
 850         te_data = iwl_mvm_get_roc_te(mvm);
 851         if (!te_data) {
 852                 IWL_WARN(mvm, "No remain on channel event\n");
 853                 return;
 854         }
 855
 856         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 857
 858         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 859                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 860         else
 861                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 862
 863         iwl_mvm_roc_finished(mvm);
 864 }
 865
 866 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 867                                 struct ieee80211_vif *vif,
 868                                 u32 duration, u32 apply_time)
 869 {
 870         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 871         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 872         struct iwl_time_event_cmd time_cmd = {};
 873
 874         lockdep_assert_held(&mvm->mutex);
 875
 876         if (te_data->running) {
 877                 u32 id;
 878
 879                 spin_lock_bh(&mvm->time_event_lock);
 880                 id = te_data->id;
 881                 spin_unlock_bh(&mvm->time_event_lock);
 882
 883                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 884                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 885                         return -EBUSY;
 886                 }
 887
 888                 /*
 889                  * Remove the session protection time event to allow the
 890                  * channel switch. If we got here, we just heard a beacon so
 891                  * the session protection is not needed anymore anyway.
 892                  */
 893                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 894         }
 895
 896         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 897         time_cmd.id_and_color =
 898                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 899         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 900         time_cmd.apply_time = cpu_to_le32(apply_time);
 901         time_cmd.max_frags = TE_V2_FRAG_NONE;
 902         time_cmd.duration = cpu_to_le32(duration);
 903         time_cmd.repeat = 1;
 904         time_cmd.interval = cpu_to_le32(1);
 905         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 906                                       TE_V2_ABSENCE);
 907
 908         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 909 }