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.
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  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
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  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.
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  47  *    notice, this list of conditions and the following disclaimer in
  48  *    the documentation and/or other materials provided with the
  49  *    distribution.
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  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         /* Do the same for the P2P device queue (STA) */
 137         if (test_and_clear_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status)) {
 138                 struct iwl_mvm_vif *mvmvif;
 139
 140                 /*
 141                  * NB: access to this pointer would be racy, but the flush bit
 142                  * can only be set when we had a P2P-Device VIF, and we have a
 143                  * flush of this work in iwl_mvm_prepare_mac_removal() so it's
 144                  * not really racy.
 145                  */
 146
 147                 if (!WARN_ON(!mvm->p2p_device_vif)) {
 148                         mvmvif = iwl_mvm_vif_from_mac80211(mvm->p2p_device_vif);
 149                         iwl_mvm_flush_sta(mvm, &mvmvif->bcast_sta, true,
 150                                           CMD_ASYNC);
 151                 }
 152         }
 153 }
 154
 155 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
 156 {
 157         /*
 158          * Of course, our status bit is just as racy as mac80211, so in
 159          * addition, fire off the work struct which will drop all frames
 160          * from the hardware queues that made it through the race. First
 161          * it will of course synchronize the TX path to make sure that
 162          * any *new* TX will be rejected.
 163          */
 164         schedule_work(&mvm->roc_done_wk);
 165 }
 166
 167 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
 168 {
 169         struct ieee80211_vif *csa_vif;
 170
 171         rcu_read_lock();
 172
 173         csa_vif = rcu_dereference(mvm->csa_vif);
 174         if (!csa_vif || !csa_vif->csa_active)
 175                 goto out_unlock;
 176
 177         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
 178
 179         /*
 180          * CSA NoA is started but we still have beacons to
 181          * transmit on the current channel.
 182          * So we just do nothing here and the switch
 183          * will be performed on the last TBTT.
 184          */
 185         if (!ieee80211_csa_is_complete(csa_vif)) {
 186                 IWL_WARN(mvm, "CSA NOA started too early\n");
 187                 goto out_unlock;
 188         }
 189
 190         ieee80211_csa_finish(csa_vif);
 191
 192         rcu_read_unlock();
 193
 194         RCU_INIT_POINTER(mvm->csa_vif, NULL);
 195
 196         return;
 197
 198 out_unlock:
 199         rcu_read_unlock();
 200 }
 201
 202 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
 203                                         struct ieee80211_vif *vif,
 204                                         const char *errmsg)
 205 {
 206         if (vif->type != NL80211_IFTYPE_STATION)
 207                 return false;
 208         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
 209                 return false;
 210         if (errmsg)
 211                 IWL_ERR(mvm, "%s\n", errmsg);
 212
 213         iwl_mvm_connection_loss(mvm, vif, errmsg);
 214         return true;
 215 }
 216
 217 static void
 218 iwl_mvm_te_handle_notify_csa(struct iwl_mvm *mvm,
 219                              struct iwl_mvm_time_event_data *te_data,
 220                              struct iwl_time_event_notif *notif)
 221 {
 222         struct ieee80211_vif *vif = te_data->vif;
 223         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 224
 225         if (!notif->status)
 226                 IWL_DEBUG_TE(mvm, "CSA time event failed to start\n");
 227
 228         switch (te_data->vif->type) {
 229         case NL80211_IFTYPE_AP:
 230                 if (!notif->status)
 231                         mvmvif->csa_failed = true;
 232                 iwl_mvm_csa_noa_start(mvm);
 233                 break;
 234         case NL80211_IFTYPE_STATION:
 235                 if (!notif->status) {
 236                         iwl_mvm_connection_loss(mvm, vif,
 237                                                 "CSA TE failed to start");
 238                         break;
 239                 }
 240                 iwl_mvm_csa_client_absent(mvm, te_data->vif);
 241                 ieee80211_chswitch_done(te_data->vif, true);
 242                 break;
 243         default:
 244                 /* should never happen */
 245                 WARN_ON_ONCE(1);
 246                 break;
 247         }
 248
 249         /* we don't need it anymore */
 250         iwl_mvm_te_clear_data(mvm, te_data);
 251 }
 252
 253 static void iwl_mvm_te_check_trigger(struct iwl_mvm *mvm,
 254                                      struct iwl_time_event_notif *notif,
 255                                      struct iwl_mvm_time_event_data *te_data)
 256 {
 257         struct iwl_fw_dbg_trigger_tlv *trig;
 258         struct iwl_fw_dbg_trigger_time_event *te_trig;
 259         int i;
 260
 261         if (!iwl_fw_dbg_trigger_enabled(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT))
 262                 return;
 263
 264         trig = iwl_fw_dbg_get_trigger(mvm->fw, FW_DBG_TRIGGER_TIME_EVENT);
 265         te_trig = (void *)trig->data;
 266
 267         if (!iwl_fw_dbg_trigger_check_stop(&mvm->fwrt,
 268                                            ieee80211_vif_to_wdev(te_data->vif),
 269                                            trig))
 270                 return;
 271
 272         for (i = 0; i < ARRAY_SIZE(te_trig->time_events); i++) {
 273                 u32 trig_te_id = le32_to_cpu(te_trig->time_events[i].id);
 274                 u32 trig_action_bitmap =
 275                         le32_to_cpu(te_trig->time_events[i].action_bitmap);
 276                 u32 trig_status_bitmap =
 277                         le32_to_cpu(te_trig->time_events[i].status_bitmap);
 278
 279                 if (trig_te_id != te_data->id ||
 280                     !(trig_action_bitmap & le32_to_cpu(notif->action)) ||
 281                     !(trig_status_bitmap & BIT(le32_to_cpu(notif->status))))
 282                         continue;
 283
 284                 iwl_fw_dbg_collect_trig(&mvm->fwrt, trig,
 285                                         "Time event %d Action 0x%x received status: %d",
 286                                         te_data->id,
 287                                         le32_to_cpu(notif->action),
 288                                         le32_to_cpu(notif->status));
 289                 break;
 290         }
 291 }
 292
 293 /*
 294  * Handles a FW notification for an event that is known to the driver.
 295  *
 296  * @mvm: the mvm component
 297  * @te_data: the time event data
 298  * @notif: the notification data corresponding the time event data.
 299  */
 300 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
 301                                     struct iwl_mvm_time_event_data *te_data,
 302                                     struct iwl_time_event_notif *notif)
 303 {
 304         lockdep_assert_held(&mvm->time_event_lock);
 305
 306         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
 307                      le32_to_cpu(notif->unique_id),
 308                      le32_to_cpu(notif->action));
 309
 310         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 311
 312         /*
 313          * The FW sends the start/end time event notifications even for events
 314          * that it fails to schedule. This is indicated in the status field of
 315          * the notification. This happens in cases that the scheduler cannot
 316          * find a schedule that can handle the event (for example requesting a
 317          * P2P Device discoveribility, while there are other higher priority
 318          * events in the system).
 319          */
 320         if (!le32_to_cpu(notif->status)) {
 321                 const char *msg;
 322
 323                 if (notif->action & cpu_to_le32(TE_V2_NOTIF_HOST_EVENT_START))
 324                         msg = "Time Event start notification failure";
 325                 else
 326                         msg = "Time Event end notification failure";
 327
 328                 IWL_DEBUG_TE(mvm, "%s\n", msg);
 329
 330                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, msg)) {
 331                         iwl_mvm_te_clear_data(mvm, te_data);
 332                         return;
 333                 }
 334         }
 335
 336         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
 337                 IWL_DEBUG_TE(mvm,
 338                              "TE ended - current time %lu, estimated end %lu\n",
 339                              jiffies, te_data->end_jiffies);
 340
 341                 switch (te_data->vif->type) {
 342                 case NL80211_IFTYPE_P2P_DEVICE:
 343                         ieee80211_remain_on_channel_expired(mvm->hw);
 344                         iwl_mvm_roc_finished(mvm);
 345                         break;
 346                 case NL80211_IFTYPE_STATION:
 347                         /*
 348                          * By now, we should have finished association
 349                          * and know the dtim period.
 350                          */
 351                         iwl_mvm_te_check_disconnect(mvm, te_data->vif,
 352                                 "No association and the time event is over already...");
 353                         break;
 354                 default:
 355                         break;
 356                 }
 357
 358                 iwl_mvm_te_clear_data(mvm, te_data);
 359         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
 360                 te_data->running = true;
 361                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
 362
 363                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 364                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
 365                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
 366                         ieee80211_ready_on_channel(mvm->hw);
 367                 } else if (te_data->id == TE_CHANNEL_SWITCH_PERIOD) {
 368                         iwl_mvm_te_handle_notify_csa(mvm, te_data, notif);
 369                 }
 370         } else {
 371                 IWL_WARN(mvm, "Got TE with unknown action\n");
 372         }
 373 }
 374
 375 /*
 376  * Handle A Aux ROC time event
 377  */
 378 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
 379                                            struct iwl_time_event_notif *notif)
 380 {
 381         struct iwl_mvm_time_event_data *te_data, *tmp;
 382         bool aux_roc_te = false;
 383
 384         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
 385                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
 386                         aux_roc_te = true;
 387                         break;
 388                 }
 389         }
 390         if (!aux_roc_te) /* Not a Aux ROC time event */
 391                 return -EINVAL;
 392
 393         iwl_mvm_te_check_trigger(mvm, notif, te_data);
 394
 395         IWL_DEBUG_TE(mvm,
 396                      "Aux ROC time event notification  - UID = 0x%x action %d (error = %d)\n",
 397                      le32_to_cpu(notif->unique_id),
 398                      le32_to_cpu(notif->action), le32_to_cpu(notif->status));
 399
 400         if (!le32_to_cpu(notif->status) ||
 401             le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
 402                 /* End TE, notify mac80211 */
 403                 ieee80211_remain_on_channel_expired(mvm->hw);
 404                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
 405                 list_del(&te_data->list); /* remove from list */
 406                 te_data->running = false;
 407                 te_data->vif = NULL;
 408                 te_data->uid = 0;
 409                 te_data->id = TE_MAX;
 410         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
 411                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
 412                 te_data->running = true;
 413                 iwl_mvm_ref(mvm, IWL_MVM_REF_ROC_AUX);
 414                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
 415         } else {
 416                 IWL_DEBUG_TE(mvm,
 417                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
 418                              le32_to_cpu(notif->action));
 419                 return -EINVAL;
 420         }
 421
 422         return 0;
 423 }
 424
 425 /*
 426  * The Rx handler for time event notifications
 427  */
 428 void iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
 429                                  struct iwl_rx_cmd_buffer *rxb)
 430 {
 431         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 432         struct iwl_time_event_notif *notif = (void *)pkt->data;
 433         struct iwl_mvm_time_event_data *te_data, *tmp;
 434
 435         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
 436                      le32_to_cpu(notif->unique_id),
 437                      le32_to_cpu(notif->action));
 438
 439         spin_lock_bh(&mvm->time_event_lock);
 440         /* This time event is triggered for Aux ROC request */
 441         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
 442                 goto unlock;
 443
 444         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
 445                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
 446                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
 447         }
 448 unlock:
 449         spin_unlock_bh(&mvm->time_event_lock);
 450 }
 451
 452 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
 453                              struct iwl_rx_packet *pkt, void *data)
 454 {
 455         struct iwl_mvm *mvm =
 456                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 457         struct iwl_mvm_time_event_data *te_data = data;
 458         struct iwl_time_event_notif *resp;
 459         int resp_len = iwl_rx_packet_payload_len(pkt);
 460
 461         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
 462                 return true;
 463
 464         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 465                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
 466                 return true;
 467         }
 468
 469         resp = (void *)pkt->data;
 470
 471         /* te_data->uid is already set in the TIME_EVENT_CMD response */
 472         if (le32_to_cpu(resp->unique_id) != te_data->uid)
 473                 return false;
 474
 475         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
 476                      te_data->uid);
 477         if (!resp->status)
 478                 IWL_ERR(mvm,
 479                         "TIME_EVENT_NOTIFICATION received but not executed\n");
 480
 481         return true;
 482 }
 483
 484 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
 485                                         struct iwl_rx_packet *pkt, void *data)
 486 {
 487         struct iwl_mvm *mvm =
 488                 container_of(notif_wait, struct iwl_mvm, notif_wait);
 489         struct iwl_mvm_time_event_data *te_data = data;
 490         struct iwl_time_event_resp *resp;
 491         int resp_len = iwl_rx_packet_payload_len(pkt);
 492
 493         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
 494                 return true;
 495
 496         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
 497                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
 498                 return true;
 499         }
 500
 501         resp = (void *)pkt->data;
 502
 503         /* we should never get a response to another TIME_EVENT_CMD here */
 504         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
 505                 return false;
 506
 507         te_data->uid = le32_to_cpu(resp->unique_id);
 508         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
 509                      te_data->uid);
 510         return true;
 511 }
 512
 513 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
 514                                        struct ieee80211_vif *vif,
 515                                        struct iwl_mvm_time_event_data *te_data,
 516                                        struct iwl_time_event_cmd *te_cmd)
 517 {
 518         static const u16 time_event_response[] = { TIME_EVENT_CMD };
 519         struct iwl_notification_wait wait_time_event;
 520         int ret;
 521
 522         lockdep_assert_held(&mvm->mutex);
 523
 524         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
 525                      le32_to_cpu(te_cmd->duration));
 526
 527         spin_lock_bh(&mvm->time_event_lock);
 528         if (WARN_ON(te_data->id != TE_MAX)) {
 529                 spin_unlock_bh(&mvm->time_event_lock);
 530                 return -EIO;
 531         }
 532         te_data->vif = vif;
 533         te_data->duration = le32_to_cpu(te_cmd->duration);
 534         te_data->id = le32_to_cpu(te_cmd->id);
 535         list_add_tail(&te_data->list, &mvm->time_event_list);
 536         spin_unlock_bh(&mvm->time_event_lock);
 537
 538         /*
 539          * Use a notification wait, which really just processes the
 540          * command response and doesn't wait for anything, in order
 541          * to be able to process the response and get the UID inside
 542          * the RX path. Using CMD_WANT_SKB doesn't work because it
 543          * stores the buffer and then wakes up this thread, by which
 544          * time another notification (that the time event started)
 545          * might already be processed unsuccessfully.
 546          */
 547         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
 548                                    time_event_response,
 549                                    ARRAY_SIZE(time_event_response),
 550                                    iwl_mvm_time_event_response, te_data);
 551
 552         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 553                                             sizeof(*te_cmd), te_cmd);
 554         if (ret) {
 555                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
 556                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
 557                 goto out_clear_te;
 558         }
 559
 560         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
 561         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
 562         /* should never fail */
 563         WARN_ON_ONCE(ret);
 564
 565         if (ret) {
 566  out_clear_te:
 567                 spin_lock_bh(&mvm->time_event_lock);
 568                 iwl_mvm_te_clear_data(mvm, te_data);
 569                 spin_unlock_bh(&mvm->time_event_lock);
 570         }
 571         return ret;
 572 }
 573
 574 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
 575                              struct ieee80211_vif *vif,
 576                              u32 duration, u32 min_duration,
 577                              u32 max_delay, bool wait_for_notif)
 578 {
 579         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 580         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 581         const u16 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
 582         struct iwl_notification_wait wait_te_notif;
 583         struct iwl_time_event_cmd time_cmd = {};
 584
 585         lockdep_assert_held(&mvm->mutex);
 586
 587         if (te_data->running &&
 588             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
 589                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
 590                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 591                 return;
 592         }
 593
 594         if (te_data->running) {
 595                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
 596                              te_data->uid,
 597                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
 598                 /*
 599                  * we don't have enough time
 600                  * cancel the current TE and issue a new one
 601                  * Of course it would be better to remove the old one only
 602                  * when the new one is added, but we don't care if we are off
 603                  * channel for a bit. All we need to do, is not to return
 604                  * before we actually begin to be on the channel.
 605                  */
 606                 iwl_mvm_stop_session_protection(mvm, vif);
 607         }
 608
 609         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 610         time_cmd.id_and_color =
 611                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 612         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
 613
 614         time_cmd.apply_time = cpu_to_le32(0);
 615
 616         time_cmd.max_frags = TE_V2_FRAG_NONE;
 617         time_cmd.max_delay = cpu_to_le32(max_delay);
 618         /* TODO: why do we need to interval = bi if it is not periodic? */
 619         time_cmd.interval = cpu_to_le32(1);
 620         time_cmd.duration = cpu_to_le32(duration);
 621         time_cmd.repeat = 1;
 622         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 623                                       TE_V2_NOTIF_HOST_EVENT_END |
 624                                       T2_V2_START_IMMEDIATELY);
 625
 626         if (!wait_for_notif) {
 627                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 628                 return;
 629         }
 630
 631         /*
 632          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
 633          * right after we send the time event
 634          */
 635         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
 636                                    te_notif_response,
 637                                    ARRAY_SIZE(te_notif_response),
 638                                    iwl_mvm_te_notif, te_data);
 639
 640         /* If TE was sent OK - wait for the notification that started */
 641         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
 642                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
 643                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
 644         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
 645                                          TU_TO_JIFFIES(max_delay))) {
 646                 IWL_ERR(mvm, "Failed to protect session until TE\n");
 647         }
 648 }
 649
 650 static bool __iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 651                                         struct iwl_mvm_time_event_data *te_data,
 652                                         u32 *uid)
 653 {
 654         u32 id;
 655
 656         /*
 657          * It is possible that by the time we got to this point the time
 658          * event was already removed.
 659          */
 660         spin_lock_bh(&mvm->time_event_lock);
 661
 662         /* Save time event uid before clearing its data */
 663         *uid = te_data->uid;
 664         id = te_data->id;
 665
 666         /*
 667          * The clear_data function handles time events that were already removed
 668          */
 669         iwl_mvm_te_clear_data(mvm, te_data);
 670         spin_unlock_bh(&mvm->time_event_lock);
 671
 672         /*
 673          * It is possible that by the time we try to remove it, the time event
 674          * has already ended and removed. In such a case there is no need to
 675          * send a removal command.
 676          */
 677         if (id == TE_MAX) {
 678                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", *uid);
 679                 return false;
 680         }
 681
 682         return true;
 683 }
 684
 685 /*
 686  * Explicit request to remove a aux roc time event. The removal of a time
 687  * event needs to be synchronized with the flow of a time event's end
 688  * notification, which also removes the time event from the op mode
 689  * data structures.
 690  */
 691 static void iwl_mvm_remove_aux_roc_te(struct iwl_mvm *mvm,
 692                                       struct iwl_mvm_vif *mvmvif,
 693                                       struct iwl_mvm_time_event_data *te_data)
 694 {
 695         struct iwl_hs20_roc_req aux_cmd = {};
 696         u32 uid;
 697         int ret;
 698
 699         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 700                 return;
 701
 702         aux_cmd.event_unique_id = cpu_to_le32(uid);
 703         aux_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 704         aux_cmd.id_and_color =
 705                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 706         IWL_DEBUG_TE(mvm, "Removing BSS AUX ROC TE 0x%x\n",
 707                      le32_to_cpu(aux_cmd.event_unique_id));
 708         ret = iwl_mvm_send_cmd_pdu(mvm, HOT_SPOT_CMD, 0,
 709                                    sizeof(aux_cmd), &aux_cmd);
 710
 711         if (WARN_ON(ret))
 712                 return;
 713 }
 714
 715 /*
 716  * Explicit request to remove a time event. The removal of a time event needs to
 717  * be synchronized with the flow of a time event's end notification, which also
 718  * removes the time event from the op mode data structures.
 719  */
 720 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
 721                                struct iwl_mvm_vif *mvmvif,
 722                                struct iwl_mvm_time_event_data *te_data)
 723 {
 724         struct iwl_time_event_cmd time_cmd = {};
 725         u32 uid;
 726         int ret;
 727
 728         if (!__iwl_mvm_remove_time_event(mvm, te_data, &uid))
 729                 return;
 730
 731         /* When we remove a TE, the UID is to be set in the id field */
 732         time_cmd.id = cpu_to_le32(uid);
 733         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
 734         time_cmd.id_and_color =
 735                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 736
 737         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
 738         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
 739                                    sizeof(time_cmd), &time_cmd);
 740         if (WARN_ON(ret))
 741                 return;
 742 }
 743
 744 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
 745                                      struct ieee80211_vif *vif)
 746 {
 747         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 748         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 749         u32 id;
 750
 751         lockdep_assert_held(&mvm->mutex);
 752
 753         spin_lock_bh(&mvm->time_event_lock);
 754         id = te_data->id;
 755         spin_unlock_bh(&mvm->time_event_lock);
 756
 757         if (id != TE_BSS_STA_AGGRESSIVE_ASSOC) {
 758                 IWL_DEBUG_TE(mvm,
 759                              "don't remove TE with id=%u (not session protection)\n",
 760                              id);
 761                 return;
 762         }
 763
 764         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 765 }
 766
 767 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 768                           int duration, enum ieee80211_roc_type type)
 769 {
 770         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 771         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 772         struct iwl_time_event_cmd time_cmd = {};
 773
 774         lockdep_assert_held(&mvm->mutex);
 775         if (te_data->running) {
 776                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
 777                 return -EBUSY;
 778         }
 779
 780         /*
 781          * Flush the done work, just in case it's still pending, so that
 782          * the work it does can complete and we can accept new frames.
 783          */
 784         flush_work(&mvm->roc_done_wk);
 785
 786         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 787         time_cmd.id_and_color =
 788                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 789
 790         switch (type) {
 791         case IEEE80211_ROC_TYPE_NORMAL:
 792                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
 793                 break;
 794         case IEEE80211_ROC_TYPE_MGMT_TX:
 795                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
 796                 break;
 797         default:
 798                 WARN_ONCE(1, "Got an invalid ROC type\n");
 799                 return -EINVAL;
 800         }
 801
 802         time_cmd.apply_time = cpu_to_le32(0);
 803         time_cmd.interval = cpu_to_le32(1);
 804
 805         /*
 806          * The P2P Device TEs can have lower priority than other events
 807          * that are being scheduled by the driver/fw, and thus it might not be
 808          * scheduled. To improve the chances of it being scheduled, allow them
 809          * to be fragmented, and in addition allow them to be delayed.
 810          */
 811         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
 812         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
 813         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
 814         time_cmd.repeat = 1;
 815         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 816                                       TE_V2_NOTIF_HOST_EVENT_END |
 817                                       T2_V2_START_IMMEDIATELY);
 818
 819         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 820 }
 821
 822 static struct iwl_mvm_time_event_data *iwl_mvm_get_roc_te(struct iwl_mvm *mvm)
 823 {
 824         struct iwl_mvm_time_event_data *te_data;
 825
 826         lockdep_assert_held(&mvm->mutex);
 827
 828         spin_lock_bh(&mvm->time_event_lock);
 829
 830         /*
 831          * Iterate over the list of time events and find the time event that is
 832          * associated with a P2P_DEVICE interface.
 833          * This assumes that a P2P_DEVICE interface can have only a single time
 834          * event at any given time and this time event coresponds to a ROC
 835          * request
 836          */
 837         list_for_each_entry(te_data, &mvm->time_event_list, list) {
 838                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE)
 839                         goto out;
 840         }
 841
 842         /* There can only be at most one AUX ROC time event, we just use the
 843          * list to simplify/unify code. Remove it if it exists.
 844          */
 845         te_data = list_first_entry_or_null(&mvm->aux_roc_te_list,
 846                                            struct iwl_mvm_time_event_data,
 847                                            list);
 848 out:
 849         spin_unlock_bh(&mvm->time_event_lock);
 850         return te_data;
 851 }
 852
 853 void iwl_mvm_cleanup_roc_te(struct iwl_mvm *mvm)
 854 {
 855         struct iwl_mvm_time_event_data *te_data;
 856         u32 uid;
 857
 858         te_data = iwl_mvm_get_roc_te(mvm);
 859         if (te_data)
 860                 __iwl_mvm_remove_time_event(mvm, te_data, &uid);
 861 }
 862
 863 void iwl_mvm_stop_roc(struct iwl_mvm *mvm)
 864 {
 865         struct iwl_mvm_vif *mvmvif;
 866         struct iwl_mvm_time_event_data *te_data;
 867
 868         te_data = iwl_mvm_get_roc_te(mvm);
 869         if (!te_data) {
 870                 IWL_WARN(mvm, "No remain on channel event\n");
 871                 return;
 872         }
 873
 874         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
 875
 876         if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
 877                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 878                 set_bit(IWL_MVM_STATUS_NEED_FLUSH_P2P, &mvm->status);
 879         } else {
 880                 iwl_mvm_remove_aux_roc_te(mvm, mvmvif, te_data);
 881         }
 882
 883         iwl_mvm_roc_finished(mvm);
 884 }
 885
 886 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
 887                                 struct ieee80211_vif *vif,
 888                                 u32 duration, u32 apply_time)
 889 {
 890         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 891         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
 892         struct iwl_time_event_cmd time_cmd = {};
 893
 894         lockdep_assert_held(&mvm->mutex);
 895
 896         if (te_data->running) {
 897                 u32 id;
 898
 899                 spin_lock_bh(&mvm->time_event_lock);
 900                 id = te_data->id;
 901                 spin_unlock_bh(&mvm->time_event_lock);
 902
 903                 if (id == TE_CHANNEL_SWITCH_PERIOD) {
 904                         IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
 905                         return -EBUSY;
 906                 }
 907
 908                 /*
 909                  * Remove the session protection time event to allow the
 910                  * channel switch. If we got here, we just heard a beacon so
 911                  * the session protection is not needed anymore anyway.
 912                  */
 913                 iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
 914         }
 915
 916         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
 917         time_cmd.id_and_color =
 918                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
 919         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
 920         time_cmd.apply_time = cpu_to_le32(apply_time);
 921         time_cmd.max_frags = TE_V2_FRAG_NONE;
 922         time_cmd.duration = cpu_to_le32(duration);
 923         time_cmd.repeat = 1;
 924         time_cmd.interval = cpu_to_le32(1);
 925         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
 926                                       TE_V2_ABSENCE);
 927
 928         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
 929 }