Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / drivers / net / wireless / iwlwifi / mvm / time-event.c
1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
5  *
6  * GPL LICENSE SUMMARY
7  *
8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of version 2 of the GNU General Public License as
13  * published by the Free Software Foundation.
14  *
15  * This program is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18  * General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
23  * USA
24  *
25  * The full GNU General Public License is included in this distribution
26  * in the file called COPYING.
27  *
28  * Contact Information:
29  *  Intel Linux Wireless <ilw@linux.intel.com>
30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
31  *
32  * BSD LICENSE
33  *
34  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
35  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
36  * All rights reserved.
37  *
38  * Redistribution and use in source and binary forms, with or without
39  * modification, are permitted provided that the following conditions
40  * are met:
41  *
42  *  * Redistributions of source code must retain the above copyright
43  *    notice, this list of conditions and the following disclaimer.
44  *  * Redistributions in binary form must reproduce the above copyright
45  *    notice, this list of conditions and the following disclaimer in
46  *    the documentation and/or other materials provided with the
47  *    distribution.
48  *  * Neither the name Intel Corporation nor the names of its
49  *    contributors may be used to endorse or promote products derived
50  *    from this software without specific prior written permission.
51  *
52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
57  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
58  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
59  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
60  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
61  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
62  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
63  *
64  *****************************************************************************/
65
66 #include <linux/jiffies.h>
67 #include <net/mac80211.h>
68
69 #include "iwl-notif-wait.h"
70 #include "iwl-trans.h"
71 #include "fw-api.h"
72 #include "time-event.h"
73 #include "mvm.h"
74 #include "iwl-io.h"
75 #include "iwl-prph.h"
76
77 /*
78  * For the high priority TE use a time event type that has similar priority to
79  * the FW's action scan priority.
80  */
81 #define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
82 #define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC
83
84 void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
85                            struct iwl_mvm_time_event_data *te_data)
86 {
87         lockdep_assert_held(&mvm->time_event_lock);
88
89         if (te_data->id == TE_MAX)
90                 return;
91
92         list_del(&te_data->list);
93         te_data->running = false;
94         te_data->uid = 0;
95         te_data->id = TE_MAX;
96         te_data->vif = NULL;
97 }
98
99 void iwl_mvm_roc_done_wk(struct work_struct *wk)
100 {
101         struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);
102         u32 queues = 0;
103
104         /*
105          * Clear the ROC_RUNNING /ROC_AUX_RUNNING status bit.
106          * This will cause the TX path to drop offchannel transmissions.
107          * That would also be done by mac80211, but it is racy, in particular
108          * in the case that the time event actually completed in the firmware
109          * (which is handled in iwl_mvm_te_handle_notif).
110          */
111         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status))
112                 queues |= BIT(IWL_MVM_OFFCHANNEL_QUEUE);
113         if (test_and_clear_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status))
114                 queues |= BIT(mvm->aux_queue);
115
116         iwl_mvm_unref(mvm, IWL_MVM_REF_ROC);
117
118         synchronize_net();
119
120         /*
121          * Flush the offchannel queue -- this is called when the time
122          * event finishes or is cancelled, so that frames queued for it
123          * won't get stuck on the queue and be transmitted in the next
124          * time event.
125          * We have to send the command asynchronously since this cannot
126          * be under the mutex for locking reasons, but that's not an
127          * issue as it will have to complete before the next command is
128          * executed, and a new time event means a new command.
129          */
130         iwl_mvm_flush_tx_path(mvm, queues, false);
131 }
132
133 static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
134 {
135         /*
136          * Of course, our status bit is just as racy as mac80211, so in
137          * addition, fire off the work struct which will drop all frames
138          * from the hardware queues that made it through the race. First
139          * it will of course synchronize the TX path to make sure that
140          * any *new* TX will be rejected.
141          */
142         schedule_work(&mvm->roc_done_wk);
143 }
144
145 static void iwl_mvm_csa_noa_start(struct iwl_mvm *mvm)
146 {
147         struct ieee80211_vif *csa_vif;
148
149         rcu_read_lock();
150
151         csa_vif = rcu_dereference(mvm->csa_vif);
152         if (!csa_vif || !csa_vif->csa_active)
153                 goto out_unlock;
154
155         IWL_DEBUG_TE(mvm, "CSA NOA started\n");
156
157         /*
158          * CSA NoA is started but we still have beacons to
159          * transmit on the current channel.
160          * So we just do nothing here and the switch
161          * will be performed on the last TBTT.
162          */
163         if (!ieee80211_csa_is_complete(csa_vif)) {
164                 IWL_WARN(mvm, "CSA NOA started too early\n");
165                 goto out_unlock;
166         }
167
168         ieee80211_csa_finish(csa_vif);
169
170         rcu_read_unlock();
171
172         RCU_INIT_POINTER(mvm->csa_vif, NULL);
173
174         return;
175
176 out_unlock:
177         rcu_read_unlock();
178 }
179
180 static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
181                                         struct ieee80211_vif *vif,
182                                         const char *errmsg)
183 {
184         if (vif->type != NL80211_IFTYPE_STATION)
185                 return false;
186         if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
187                 return false;
188         if (errmsg)
189                 IWL_ERR(mvm, "%s\n", errmsg);
190         ieee80211_connection_loss(vif);
191         return true;
192 }
193
194 /*
195  * Handles a FW notification for an event that is known to the driver.
196  *
197  * @mvm: the mvm component
198  * @te_data: the time event data
199  * @notif: the notification data corresponding the time event data.
200  */
201 static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
202                                     struct iwl_mvm_time_event_data *te_data,
203                                     struct iwl_time_event_notif *notif)
204 {
205         lockdep_assert_held(&mvm->time_event_lock);
206
207         IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
208                      le32_to_cpu(notif->unique_id),
209                      le32_to_cpu(notif->action));
210
211         /*
212          * The FW sends the start/end time event notifications even for events
213          * that it fails to schedule. This is indicated in the status field of
214          * the notification. This happens in cases that the scheduler cannot
215          * find a schedule that can handle the event (for example requesting a
216          * P2P Device discoveribility, while there are other higher priority
217          * events in the system).
218          */
219         if (!le32_to_cpu(notif->status)) {
220                 bool start = le32_to_cpu(notif->action) &
221                                 TE_V2_NOTIF_HOST_EVENT_START;
222                 IWL_WARN(mvm, "Time Event %s notification failure\n",
223                          start ? "start" : "end");
224                 if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, NULL)) {
225                         iwl_mvm_te_clear_data(mvm, te_data);
226                         return;
227                 }
228         }
229
230         if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
231                 IWL_DEBUG_TE(mvm,
232                              "TE ended - current time %lu, estimated end %lu\n",
233                              jiffies, te_data->end_jiffies);
234
235                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
236                         ieee80211_remain_on_channel_expired(mvm->hw);
237                         iwl_mvm_roc_finished(mvm);
238                 }
239
240                 /*
241                  * By now, we should have finished association
242                  * and know the dtim period.
243                  */
244                 iwl_mvm_te_check_disconnect(mvm, te_data->vif,
245                         "No association and the time event is over already...");
246                 iwl_mvm_te_clear_data(mvm, te_data);
247         } else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
248                 te_data->running = true;
249                 te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);
250
251                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
252                         set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
253                         iwl_mvm_ref(mvm, IWL_MVM_REF_ROC);
254                         ieee80211_ready_on_channel(mvm->hw);
255                 } else if (te_data->vif->type == NL80211_IFTYPE_AP) {
256                         if (le32_to_cpu(notif->status))
257                                 iwl_mvm_csa_noa_start(mvm);
258                         else
259                                 IWL_DEBUG_TE(mvm, "CSA NOA failed to start\n");
260
261                         /* we don't need it anymore */
262                         iwl_mvm_te_clear_data(mvm, te_data);
263                 }
264         } else {
265                 IWL_WARN(mvm, "Got TE with unknown action\n");
266         }
267 }
268
269 /*
270  * Handle A Aux ROC time event
271  */
272 static int iwl_mvm_aux_roc_te_handle_notif(struct iwl_mvm *mvm,
273                                            struct iwl_time_event_notif *notif)
274 {
275         struct iwl_mvm_time_event_data *te_data, *tmp;
276         bool aux_roc_te = false;
277
278         list_for_each_entry_safe(te_data, tmp, &mvm->aux_roc_te_list, list) {
279                 if (le32_to_cpu(notif->unique_id) == te_data->uid) {
280                         aux_roc_te = true;
281                         break;
282                 }
283         }
284         if (!aux_roc_te) /* Not a Aux ROC time event */
285                 return -EINVAL;
286
287         if (!le32_to_cpu(notif->status)) {
288                 IWL_DEBUG_TE(mvm,
289                              "ERROR: Aux ROC Time Event %s notification failure\n",
290                              (le32_to_cpu(notif->action) &
291                               TE_V2_NOTIF_HOST_EVENT_START) ? "start" : "end");
292                 return -EINVAL;
293         }
294
295         IWL_DEBUG_TE(mvm,
296                      "Aux ROC time event notification  - UID = 0x%x action %d\n",
297                      le32_to_cpu(notif->unique_id),
298                      le32_to_cpu(notif->action));
299
300         if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_END) {
301                 /* End TE, notify mac80211 */
302                 ieee80211_remain_on_channel_expired(mvm->hw);
303                 iwl_mvm_roc_finished(mvm); /* flush aux queue */
304                 list_del(&te_data->list); /* remove from list */
305                 te_data->running = false;
306                 te_data->vif = NULL;
307                 te_data->uid = 0;
308         } else if (le32_to_cpu(notif->action) == TE_V2_NOTIF_HOST_EVENT_START) {
309                 set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
310                 set_bit(IWL_MVM_STATUS_ROC_AUX_RUNNING, &mvm->status);
311                 te_data->running = true;
312                 ieee80211_ready_on_channel(mvm->hw); /* Start TE */
313         } else {
314                 IWL_DEBUG_TE(mvm,
315                              "ERROR: Unknown Aux ROC Time Event (action = %d)\n",
316                              le32_to_cpu(notif->action));
317                 return -EINVAL;
318         }
319
320         return 0;
321 }
322
323 /*
324  * The Rx handler for time event notifications
325  */
326 int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
327                                 struct iwl_rx_cmd_buffer *rxb,
328                                 struct iwl_device_cmd *cmd)
329 {
330         struct iwl_rx_packet *pkt = rxb_addr(rxb);
331         struct iwl_time_event_notif *notif = (void *)pkt->data;
332         struct iwl_mvm_time_event_data *te_data, *tmp;
333
334         IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
335                      le32_to_cpu(notif->unique_id),
336                      le32_to_cpu(notif->action));
337
338         spin_lock_bh(&mvm->time_event_lock);
339         /* This time event is triggered for Aux ROC request */
340         if (!iwl_mvm_aux_roc_te_handle_notif(mvm, notif))
341                 goto unlock;
342
343         list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
344                 if (le32_to_cpu(notif->unique_id) == te_data->uid)
345                         iwl_mvm_te_handle_notif(mvm, te_data, notif);
346         }
347 unlock:
348         spin_unlock_bh(&mvm->time_event_lock);
349
350         return 0;
351 }
352
353 static bool iwl_mvm_te_notif(struct iwl_notif_wait_data *notif_wait,
354                              struct iwl_rx_packet *pkt, void *data)
355 {
356         struct iwl_mvm *mvm =
357                 container_of(notif_wait, struct iwl_mvm, notif_wait);
358         struct iwl_mvm_time_event_data *te_data = data;
359         struct iwl_time_event_notif *resp;
360         int resp_len = iwl_rx_packet_payload_len(pkt);
361
362         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_NOTIFICATION))
363                 return true;
364
365         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
366                 IWL_ERR(mvm, "Invalid TIME_EVENT_NOTIFICATION response\n");
367                 return true;
368         }
369
370         resp = (void *)pkt->data;
371
372         /* te_data->uid is already set in the TIME_EVENT_CMD response */
373         if (le32_to_cpu(resp->unique_id) != te_data->uid)
374                 return false;
375
376         IWL_DEBUG_TE(mvm, "TIME_EVENT_NOTIFICATION response - UID = 0x%x\n",
377                      te_data->uid);
378         if (!resp->status)
379                 IWL_ERR(mvm,
380                         "TIME_EVENT_NOTIFICATION received but not executed\n");
381
382         return true;
383 }
384
385 static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
386                                         struct iwl_rx_packet *pkt, void *data)
387 {
388         struct iwl_mvm *mvm =
389                 container_of(notif_wait, struct iwl_mvm, notif_wait);
390         struct iwl_mvm_time_event_data *te_data = data;
391         struct iwl_time_event_resp *resp;
392         int resp_len = iwl_rx_packet_payload_len(pkt);
393
394         if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
395                 return true;
396
397         if (WARN_ON_ONCE(resp_len != sizeof(*resp))) {
398                 IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
399                 return true;
400         }
401
402         resp = (void *)pkt->data;
403
404         /* we should never get a response to another TIME_EVENT_CMD here */
405         if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
406                 return false;
407
408         te_data->uid = le32_to_cpu(resp->unique_id);
409         IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
410                      te_data->uid);
411         return true;
412 }
413
414 static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
415                                        struct ieee80211_vif *vif,
416                                        struct iwl_mvm_time_event_data *te_data,
417                                        struct iwl_time_event_cmd *te_cmd)
418 {
419         static const u8 time_event_response[] = { TIME_EVENT_CMD };
420         struct iwl_notification_wait wait_time_event;
421         int ret;
422
423         lockdep_assert_held(&mvm->mutex);
424
425         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
426                      le32_to_cpu(te_cmd->duration));
427
428         spin_lock_bh(&mvm->time_event_lock);
429         if (WARN_ON(te_data->id != TE_MAX)) {
430                 spin_unlock_bh(&mvm->time_event_lock);
431                 return -EIO;
432         }
433         te_data->vif = vif;
434         te_data->duration = le32_to_cpu(te_cmd->duration);
435         te_data->id = le32_to_cpu(te_cmd->id);
436         list_add_tail(&te_data->list, &mvm->time_event_list);
437         spin_unlock_bh(&mvm->time_event_lock);
438
439         /*
440          * Use a notification wait, which really just processes the
441          * command response and doesn't wait for anything, in order
442          * to be able to process the response and get the UID inside
443          * the RX path. Using CMD_WANT_SKB doesn't work because it
444          * stores the buffer and then wakes up this thread, by which
445          * time another notification (that the time event started)
446          * might already be processed unsuccessfully.
447          */
448         iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
449                                    time_event_response,
450                                    ARRAY_SIZE(time_event_response),
451                                    iwl_mvm_time_event_response, te_data);
452
453         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
454                                             sizeof(*te_cmd), te_cmd);
455         if (ret) {
456                 IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
457                 iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
458                 goto out_clear_te;
459         }
460
461         /* No need to wait for anything, so just pass 1 (0 isn't valid) */
462         ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
463         /* should never fail */
464         WARN_ON_ONCE(ret);
465
466         if (ret) {
467  out_clear_te:
468                 spin_lock_bh(&mvm->time_event_lock);
469                 iwl_mvm_te_clear_data(mvm, te_data);
470                 spin_unlock_bh(&mvm->time_event_lock);
471         }
472         return ret;
473 }
474
475 void iwl_mvm_protect_session(struct iwl_mvm *mvm,
476                              struct ieee80211_vif *vif,
477                              u32 duration, u32 min_duration,
478                              u32 max_delay, bool wait_for_notif)
479 {
480         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
481         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
482         const u8 te_notif_response[] = { TIME_EVENT_NOTIFICATION };
483         struct iwl_notification_wait wait_te_notif;
484         struct iwl_time_event_cmd time_cmd = {};
485
486         lockdep_assert_held(&mvm->mutex);
487
488         if (te_data->running &&
489             time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
490                 IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
491                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
492                 return;
493         }
494
495         if (te_data->running) {
496                 IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
497                              te_data->uid,
498                              jiffies_to_msecs(te_data->end_jiffies - jiffies));
499                 /*
500                  * we don't have enough time
501                  * cancel the current TE and issue a new one
502                  * Of course it would be better to remove the old one only
503                  * when the new one is added, but we don't care if we are off
504                  * channel for a bit. All we need to do, is not to return
505                  * before we actually begin to be on the channel.
506                  */
507                 iwl_mvm_stop_session_protection(mvm, vif);
508         }
509
510         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
511         time_cmd.id_and_color =
512                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
513         time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);
514
515         time_cmd.apply_time =
516                 cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG));
517
518         time_cmd.max_frags = TE_V2_FRAG_NONE;
519         time_cmd.max_delay = cpu_to_le32(max_delay);
520         /* TODO: why do we need to interval = bi if it is not periodic? */
521         time_cmd.interval = cpu_to_le32(1);
522         time_cmd.duration = cpu_to_le32(duration);
523         time_cmd.repeat = 1;
524         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
525                                       TE_V2_NOTIF_HOST_EVENT_END |
526                                       T2_V2_START_IMMEDIATELY);
527
528         if (!wait_for_notif) {
529                 iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
530                 return;
531         }
532
533         /*
534          * Create notification_wait for the TIME_EVENT_NOTIFICATION to use
535          * right after we send the time event
536          */
537         iwl_init_notification_wait(&mvm->notif_wait, &wait_te_notif,
538                                    te_notif_response,
539                                    ARRAY_SIZE(te_notif_response),
540                                    iwl_mvm_te_notif, te_data);
541
542         /* If TE was sent OK - wait for the notification that started */
543         if (iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd)) {
544                 IWL_ERR(mvm, "Failed to add TE to protect session\n");
545                 iwl_remove_notification(&mvm->notif_wait, &wait_te_notif);
546         } else if (iwl_wait_notification(&mvm->notif_wait, &wait_te_notif,
547                                          TU_TO_JIFFIES(max_delay))) {
548                 IWL_ERR(mvm, "Failed to protect session until TE\n");
549         }
550 }
551
552 /*
553  * Explicit request to remove a time event. The removal of a time event needs to
554  * be synchronized with the flow of a time event's end notification, which also
555  * removes the time event from the op mode data structures.
556  */
557 void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
558                                struct iwl_mvm_vif *mvmvif,
559                                struct iwl_mvm_time_event_data *te_data)
560 {
561         struct iwl_time_event_cmd time_cmd = {};
562         u32 id, uid;
563         int ret;
564
565         /*
566          * It is possible that by the time we got to this point the time
567          * event was already removed.
568          */
569         spin_lock_bh(&mvm->time_event_lock);
570
571         /* Save time event uid before clearing its data */
572         uid = te_data->uid;
573         id = te_data->id;
574
575         /*
576          * The clear_data function handles time events that were already removed
577          */
578         iwl_mvm_te_clear_data(mvm, te_data);
579         spin_unlock_bh(&mvm->time_event_lock);
580
581         /*
582          * It is possible that by the time we try to remove it, the time event
583          * has already ended and removed. In such a case there is no need to
584          * send a removal command.
585          */
586         if (id == TE_MAX) {
587                 IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid);
588                 return;
589         }
590
591         /* When we remove a TE, the UID is to be set in the id field */
592         time_cmd.id = cpu_to_le32(uid);
593         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
594         time_cmd.id_and_color =
595                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
596
597         IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
598         ret = iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, 0,
599                                    sizeof(time_cmd), &time_cmd);
600         if (WARN_ON(ret))
601                 return;
602 }
603
604 void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
605                                      struct ieee80211_vif *vif)
606 {
607         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
608         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
609
610         lockdep_assert_held(&mvm->mutex);
611         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
612 }
613
614 int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
615                           int duration, enum ieee80211_roc_type type)
616 {
617         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
618         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
619         struct iwl_time_event_cmd time_cmd = {};
620
621         lockdep_assert_held(&mvm->mutex);
622         if (te_data->running) {
623                 IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
624                 return -EBUSY;
625         }
626
627         /*
628          * Flush the done work, just in case it's still pending, so that
629          * the work it does can complete and we can accept new frames.
630          */
631         flush_work(&mvm->roc_done_wk);
632
633         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
634         time_cmd.id_and_color =
635                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
636
637         switch (type) {
638         case IEEE80211_ROC_TYPE_NORMAL:
639                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
640                 break;
641         case IEEE80211_ROC_TYPE_MGMT_TX:
642                 time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
643                 break;
644         default:
645                 WARN_ONCE(1, "Got an invalid ROC type\n");
646                 return -EINVAL;
647         }
648
649         time_cmd.apply_time = cpu_to_le32(0);
650         time_cmd.interval = cpu_to_le32(1);
651
652         /*
653          * The P2P Device TEs can have lower priority than other events
654          * that are being scheduled by the driver/fw, and thus it might not be
655          * scheduled. To improve the chances of it being scheduled, allow them
656          * to be fragmented, and in addition allow them to be delayed.
657          */
658         time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
659         time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
660         time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
661         time_cmd.repeat = 1;
662         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
663                                       TE_V2_NOTIF_HOST_EVENT_END |
664                                       T2_V2_START_IMMEDIATELY);
665
666         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
667 }
668
669 void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm)
670 {
671         struct iwl_mvm_vif *mvmvif;
672         struct iwl_mvm_time_event_data *te_data;
673
674         lockdep_assert_held(&mvm->mutex);
675
676         /*
677          * Iterate over the list of time events and find the time event that is
678          * associated with a P2P_DEVICE interface.
679          * This assumes that a P2P_DEVICE interface can have only a single time
680          * event at any given time and this time event coresponds to a ROC
681          * request
682          */
683         mvmvif = NULL;
684         spin_lock_bh(&mvm->time_event_lock);
685         list_for_each_entry(te_data, &mvm->time_event_list, list) {
686                 if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
687                         mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
688                         break;
689                 }
690         }
691         spin_unlock_bh(&mvm->time_event_lock);
692
693         if (!mvmvif) {
694                 IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n");
695                 return;
696         }
697
698         iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
699
700         iwl_mvm_roc_finished(mvm);
701 }
702
703 int iwl_mvm_schedule_csa_period(struct iwl_mvm *mvm,
704                                 struct ieee80211_vif *vif,
705                                 u32 duration, u32 apply_time)
706 {
707         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
708         struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
709         struct iwl_time_event_cmd time_cmd = {};
710
711         lockdep_assert_held(&mvm->mutex);
712
713         if (te_data->running) {
714                 IWL_DEBUG_TE(mvm, "CS period is already scheduled\n");
715                 return -EBUSY;
716         }
717
718         time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
719         time_cmd.id_and_color =
720                 cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
721         time_cmd.id = cpu_to_le32(TE_CHANNEL_SWITCH_PERIOD);
722         time_cmd.apply_time = cpu_to_le32(apply_time);
723         time_cmd.max_frags = TE_V2_FRAG_NONE;
724         time_cmd.duration = cpu_to_le32(duration);
725         time_cmd.repeat = 1;
726         time_cmd.interval = cpu_to_le32(1);
727         time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
728                                       TE_V2_ABSENCE);
729
730         return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
731 }