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