summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/mvm/time-event.c
blob: 95ce4b601fef3050085518e59a4e32036c57fbfc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <linux/jiffies.h>
#include <net/mac80211.h>

#include "iwl-notif-wait.h"
#include "iwl-trans.h"
#include "fw-api.h"
#include "time-event.h"
#include "mvm.h"
#include "iwl-io.h"
#include "iwl-prph.h"

/* A TimeUnit is 1024 microsecond */
#define MSEC_TO_TU(_msec)	(_msec*1000/1024)

/*
 * For the high priority TE use a time event type that has similar priority to
 * the FW's action scan priority.
 */
#define IWL_MVM_ROC_TE_TYPE_NORMAL TE_P2P_DEVICE_DISCOVERABLE
#define IWL_MVM_ROC_TE_TYPE_MGMT_TX TE_P2P_CLIENT_ASSOC

void iwl_mvm_te_clear_data(struct iwl_mvm *mvm,
			   struct iwl_mvm_time_event_data *te_data)
{
	lockdep_assert_held(&mvm->time_event_lock);

	if (te_data->id == TE_MAX)
		return;

	list_del(&te_data->list);
	te_data->running = false;
	te_data->uid = 0;
	te_data->id = TE_MAX;
	te_data->vif = NULL;
}

void iwl_mvm_roc_done_wk(struct work_struct *wk)
{
	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, roc_done_wk);

	synchronize_net();

	/*
	 * Flush the offchannel queue -- this is called when the time
	 * event finishes or is cancelled, so that frames queued for it
	 * won't get stuck on the queue and be transmitted in the next
	 * time event.
	 * We have to send the command asynchronously since this cannot
	 * be under the mutex for locking reasons, but that's not an
	 * issue as it will have to complete before the next command is
	 * executed, and a new time event means a new command.
	 */
	iwl_mvm_flush_tx_path(mvm, BIT(IWL_MVM_OFFCHANNEL_QUEUE), false);
}

static void iwl_mvm_roc_finished(struct iwl_mvm *mvm)
{
	/*
	 * First, clear the ROC_RUNNING status bit. This will cause the TX
	 * path to drop offchannel transmissions. That would also be done
	 * by mac80211, but it is racy, in particular in the case that the
	 * time event actually completed in the firmware (which is handled
	 * in iwl_mvm_te_handle_notif).
	 */
	clear_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);

	/*
	 * Of course, our status bit is just as racy as mac80211, so in
	 * addition, fire off the work struct which will drop all frames
	 * from the hardware queues that made it through the race. First
	 * it will of course synchronize the TX path to make sure that
	 * any *new* TX will be rejected.
	 */
	schedule_work(&mvm->roc_done_wk);
}

static bool iwl_mvm_te_check_disconnect(struct iwl_mvm *mvm,
					struct ieee80211_vif *vif,
					const char *errmsg)
{
	if (vif->type != NL80211_IFTYPE_STATION)
		return false;
	if (vif->bss_conf.assoc && vif->bss_conf.dtim_period)
		return false;
	if (errmsg)
		IWL_ERR(mvm, "%s\n", errmsg);
	ieee80211_connection_loss(vif);
	return true;
}

/*
 * Handles a FW notification for an event that is known to the driver.
 *
 * @mvm: the mvm component
 * @te_data: the time event data
 * @notif: the notification data corresponding the time event data.
 */
static void iwl_mvm_te_handle_notif(struct iwl_mvm *mvm,
				    struct iwl_mvm_time_event_data *te_data,
				    struct iwl_time_event_notif *notif)
{
	lockdep_assert_held(&mvm->time_event_lock);

	IWL_DEBUG_TE(mvm, "Handle time event notif - UID = 0x%x action %d\n",
		     le32_to_cpu(notif->unique_id),
		     le32_to_cpu(notif->action));

	/*
	 * The FW sends the start/end time event notifications even for events
	 * that it fails to schedule. This is indicated in the status field of
	 * the notification. This happens in cases that the scheduler cannot
	 * find a schedule that can handle the event (for example requesting a
	 * P2P Device discoveribility, while there are other higher priority
	 * events in the system).
	 */
	if (!le32_to_cpu(notif->status)) {
		bool start = le32_to_cpu(notif->action) &
				TE_V2_NOTIF_HOST_EVENT_START;
		IWL_WARN(mvm, "Time Event %s notification failure\n",
			 start ? "start" : "end");
		if (iwl_mvm_te_check_disconnect(mvm, te_data->vif, NULL)) {
			iwl_mvm_te_clear_data(mvm, te_data);
			return;
		}
	}

	if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_END) {
		IWL_DEBUG_TE(mvm,
			     "TE ended - current time %lu, estimated end %lu\n",
			     jiffies, te_data->end_jiffies);

		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			ieee80211_remain_on_channel_expired(mvm->hw);
			iwl_mvm_roc_finished(mvm);
		}

		/*
		 * By now, we should have finished association
		 * and know the dtim period.
		 */
		iwl_mvm_te_check_disconnect(mvm, te_data->vif,
			"No association and the time event is over already...");
		iwl_mvm_te_clear_data(mvm, te_data);
	} else if (le32_to_cpu(notif->action) & TE_V2_NOTIF_HOST_EVENT_START) {
		te_data->running = true;
		te_data->end_jiffies = TU_TO_EXP_TIME(te_data->duration);

		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			set_bit(IWL_MVM_STATUS_ROC_RUNNING, &mvm->status);
			ieee80211_ready_on_channel(mvm->hw);
		}
	} else {
		IWL_WARN(mvm, "Got TE with unknown action\n");
	}
}

/*
 * The Rx handler for time event notifications
 */
int iwl_mvm_rx_time_event_notif(struct iwl_mvm *mvm,
				struct iwl_rx_cmd_buffer *rxb,
				struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_time_event_notif *notif = (void *)pkt->data;
	struct iwl_mvm_time_event_data *te_data, *tmp;

	IWL_DEBUG_TE(mvm, "Time event notification - UID = 0x%x action %d\n",
		     le32_to_cpu(notif->unique_id),
		     le32_to_cpu(notif->action));

	spin_lock_bh(&mvm->time_event_lock);
	list_for_each_entry_safe(te_data, tmp, &mvm->time_event_list, list) {
		if (le32_to_cpu(notif->unique_id) == te_data->uid)
			iwl_mvm_te_handle_notif(mvm, te_data, notif);
	}
	spin_unlock_bh(&mvm->time_event_lock);

	return 0;
}

static bool iwl_mvm_time_event_response(struct iwl_notif_wait_data *notif_wait,
					struct iwl_rx_packet *pkt, void *data)
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	struct iwl_mvm_time_event_data *te_data = data;
	struct iwl_time_event_resp *resp;
	int resp_len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;

	if (WARN_ON(pkt->hdr.cmd != TIME_EVENT_CMD))
		return true;

	if (WARN_ON_ONCE(resp_len != sizeof(pkt->hdr) + sizeof(*resp))) {
		IWL_ERR(mvm, "Invalid TIME_EVENT_CMD response\n");
		return true;
	}

	resp = (void *)pkt->data;

	/* we should never get a response to another TIME_EVENT_CMD here */
	if (WARN_ON_ONCE(le32_to_cpu(resp->id) != te_data->id))
		return false;

	te_data->uid = le32_to_cpu(resp->unique_id);
	IWL_DEBUG_TE(mvm, "TIME_EVENT_CMD response - UID = 0x%x\n",
		     te_data->uid);
	return true;
}

/* used to convert from time event API v2 to v1 */
#define TE_V2_DEP_POLICY_MSK (TE_V2_DEP_OTHER | TE_V2_DEP_TSF |\
			     TE_V2_EVENT_SOCIOPATHIC)
static inline u16 te_v2_get_notify(__le16 policy)
{
	return le16_to_cpu(policy) & TE_V2_NOTIF_MSK;
}

static inline u16 te_v2_get_dep_policy(__le16 policy)
{
	return (le16_to_cpu(policy) & TE_V2_DEP_POLICY_MSK) >>
		TE_V2_PLACEMENT_POS;
}

static inline u16 te_v2_get_absence(__le16 policy)
{
	return (le16_to_cpu(policy) & TE_V2_ABSENCE) >> TE_V2_ABSENCE_POS;
}

static void iwl_mvm_te_v2_to_v1(const struct iwl_time_event_cmd_v2 *cmd_v2,
				struct iwl_time_event_cmd_v1 *cmd_v1)
{
	cmd_v1->id_and_color = cmd_v2->id_and_color;
	cmd_v1->action = cmd_v2->action;
	cmd_v1->id = cmd_v2->id;
	cmd_v1->apply_time = cmd_v2->apply_time;
	cmd_v1->max_delay = cmd_v2->max_delay;
	cmd_v1->depends_on = cmd_v2->depends_on;
	cmd_v1->interval = cmd_v2->interval;
	cmd_v1->duration = cmd_v2->duration;
	if (cmd_v2->repeat == TE_V2_REPEAT_ENDLESS)
		cmd_v1->repeat = cpu_to_le32(TE_V1_REPEAT_ENDLESS);
	else
		cmd_v1->repeat = cpu_to_le32(cmd_v2->repeat);
	cmd_v1->max_frags = cpu_to_le32(cmd_v2->max_frags);
	cmd_v1->interval_reciprocal = 0; /* unused */

	cmd_v1->dep_policy = cpu_to_le32(te_v2_get_dep_policy(cmd_v2->policy));
	cmd_v1->is_present = cpu_to_le32(!te_v2_get_absence(cmd_v2->policy));
	cmd_v1->notify = cpu_to_le32(te_v2_get_notify(cmd_v2->policy));
}

static int iwl_mvm_send_time_event_cmd(struct iwl_mvm *mvm,
				       const struct iwl_time_event_cmd_v2 *cmd)
{
	struct iwl_time_event_cmd_v1 cmd_v1;

	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_TIME_EVENT_API_V2)
		return iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC,
					    sizeof(*cmd), cmd);

	iwl_mvm_te_v2_to_v1(cmd, &cmd_v1);
	return iwl_mvm_send_cmd_pdu(mvm, TIME_EVENT_CMD, CMD_SYNC,
				    sizeof(cmd_v1), &cmd_v1);
}


static int iwl_mvm_time_event_send_add(struct iwl_mvm *mvm,
				       struct ieee80211_vif *vif,
				       struct iwl_mvm_time_event_data *te_data,
				       struct iwl_time_event_cmd_v2 *te_cmd)
{
	static const u8 time_event_response[] = { TIME_EVENT_CMD };
	struct iwl_notification_wait wait_time_event;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
		     le32_to_cpu(te_cmd->duration));

	spin_lock_bh(&mvm->time_event_lock);
	if (WARN_ON(te_data->id != TE_MAX)) {
		spin_unlock_bh(&mvm->time_event_lock);
		return -EIO;
	}
	te_data->vif = vif;
	te_data->duration = le32_to_cpu(te_cmd->duration);
	te_data->id = le32_to_cpu(te_cmd->id);
	list_add_tail(&te_data->list, &mvm->time_event_list);
	spin_unlock_bh(&mvm->time_event_lock);

	/*
	 * Use a notification wait, which really just processes the
	 * command response and doesn't wait for anything, in order
	 * to be able to process the response and get the UID inside
	 * the RX path. Using CMD_WANT_SKB doesn't work because it
	 * stores the buffer and then wakes up this thread, by which
	 * time another notification (that the time event started)
	 * might already be processed unsuccessfully.
	 */
	iwl_init_notification_wait(&mvm->notif_wait, &wait_time_event,
				   time_event_response,
				   ARRAY_SIZE(time_event_response),
				   iwl_mvm_time_event_response, te_data);

	ret = iwl_mvm_send_time_event_cmd(mvm, te_cmd);
	if (ret) {
		IWL_ERR(mvm, "Couldn't send TIME_EVENT_CMD: %d\n", ret);
		iwl_remove_notification(&mvm->notif_wait, &wait_time_event);
		goto out_clear_te;
	}

	/* No need to wait for anything, so just pass 1 (0 isn't valid) */
	ret = iwl_wait_notification(&mvm->notif_wait, &wait_time_event, 1);
	/* should never fail */
	WARN_ON_ONCE(ret);

	if (ret) {
 out_clear_te:
		spin_lock_bh(&mvm->time_event_lock);
		iwl_mvm_te_clear_data(mvm, te_data);
		spin_unlock_bh(&mvm->time_event_lock);
	}
	return ret;
}

void iwl_mvm_protect_session(struct iwl_mvm *mvm,
			     struct ieee80211_vif *vif,
			     u32 duration, u32 min_duration,
			     u32 max_delay)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
	struct iwl_time_event_cmd_v2 time_cmd = {};

	lockdep_assert_held(&mvm->mutex);

	if (te_data->running &&
	    time_after(te_data->end_jiffies, TU_TO_EXP_TIME(min_duration))) {
		IWL_DEBUG_TE(mvm, "We have enough time in the current TE: %u\n",
			     jiffies_to_msecs(te_data->end_jiffies - jiffies));
		return;
	}

	if (te_data->running) {
		IWL_DEBUG_TE(mvm, "extend 0x%x: only %u ms left\n",
			     te_data->uid,
			     jiffies_to_msecs(te_data->end_jiffies - jiffies));
		/*
		 * we don't have enough time
		 * cancel the current TE and issue a new one
		 * Of course it would be better to remove the old one only
		 * when the new one is added, but we don't care if we are off
		 * channel for a bit. All we need to do, is not to return
		 * before we actually begin to be on the channel.
		 */
		iwl_mvm_stop_session_protection(mvm, vif);
	}

	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));
	time_cmd.id = cpu_to_le32(TE_BSS_STA_AGGRESSIVE_ASSOC);

	time_cmd.apply_time =
		cpu_to_le32(iwl_read_prph(mvm->trans, DEVICE_SYSTEM_TIME_REG));

	time_cmd.max_frags = TE_V2_FRAG_NONE;
	time_cmd.max_delay = cpu_to_le32(max_delay);
	/* TODO: why do we need to interval = bi if it is not periodic? */
	time_cmd.interval = cpu_to_le32(1);
	time_cmd.duration = cpu_to_le32(duration);
	time_cmd.repeat = 1;
	time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
				      TE_V2_NOTIF_HOST_EVENT_END);

	iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
}

/*
 * Explicit request to remove a time event. The removal of a time event needs to
 * be synchronized with the flow of a time event's end notification, which also
 * removes the time event from the op mode data structures.
 */
void iwl_mvm_remove_time_event(struct iwl_mvm *mvm,
			       struct iwl_mvm_vif *mvmvif,
			       struct iwl_mvm_time_event_data *te_data)
{
	struct iwl_time_event_cmd_v2 time_cmd = {};
	u32 id, uid;
	int ret;

	/*
	 * It is possible that by the time we got to this point the time
	 * event was already removed.
	 */
	spin_lock_bh(&mvm->time_event_lock);

	/* Save time event uid before clearing its data */
	uid = te_data->uid;
	id = te_data->id;

	/*
	 * The clear_data function handles time events that were already removed
	 */
	iwl_mvm_te_clear_data(mvm, te_data);
	spin_unlock_bh(&mvm->time_event_lock);

	/*
	 * It is possible that by the time we try to remove it, the time event
	 * has already ended and removed. In such a case there is no need to
	 * send a removal command.
	 */
	if (id == TE_MAX) {
		IWL_DEBUG_TE(mvm, "TE 0x%x has already ended\n", uid);
		return;
	}

	/* When we remove a TE, the UID is to be set in the id field */
	time_cmd.id = cpu_to_le32(uid);
	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));

	IWL_DEBUG_TE(mvm, "Removing TE 0x%x\n", le32_to_cpu(time_cmd.id));
	ret = iwl_mvm_send_time_event_cmd(mvm, &time_cmd);
	if (WARN_ON(ret))
		return;
}

void iwl_mvm_stop_session_protection(struct iwl_mvm *mvm,
				     struct ieee80211_vif *vif)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;

	lockdep_assert_held(&mvm->mutex);
	iwl_mvm_remove_time_event(mvm, mvmvif, te_data);
}

int iwl_mvm_start_p2p_roc(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			  int duration, enum ieee80211_roc_type type)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_time_event_data *te_data = &mvmvif->time_event_data;
	struct iwl_time_event_cmd_v2 time_cmd = {};

	lockdep_assert_held(&mvm->mutex);
	if (te_data->running) {
		IWL_WARN(mvm, "P2P_DEVICE remain on channel already running\n");
		return -EBUSY;
	}

	/*
	 * Flush the done work, just in case it's still pending, so that
	 * the work it does can complete and we can accept new frames.
	 */
	flush_work(&mvm->roc_done_wk);

	time_cmd.action = cpu_to_le32(FW_CTXT_ACTION_ADD);
	time_cmd.id_and_color =
		cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color));

	switch (type) {
	case IEEE80211_ROC_TYPE_NORMAL:
		time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_NORMAL);
		break;
	case IEEE80211_ROC_TYPE_MGMT_TX:
		time_cmd.id = cpu_to_le32(IWL_MVM_ROC_TE_TYPE_MGMT_TX);
		break;
	default:
		WARN_ONCE(1, "Got an invalid ROC type\n");
		return -EINVAL;
	}

	time_cmd.apply_time = cpu_to_le32(0);
	time_cmd.interval = cpu_to_le32(1);

	/*
	 * The P2P Device TEs can have lower priority than other events
	 * that are being scheduled by the driver/fw, and thus it might not be
	 * scheduled. To improve the chances of it being scheduled, allow them
	 * to be fragmented, and in addition allow them to be delayed.
	 */
	time_cmd.max_frags = min(MSEC_TO_TU(duration)/50, TE_V2_FRAG_ENDLESS);
	time_cmd.max_delay = cpu_to_le32(MSEC_TO_TU(duration/2));
	time_cmd.duration = cpu_to_le32(MSEC_TO_TU(duration));
	time_cmd.repeat = 1;
	time_cmd.policy = cpu_to_le16(TE_V2_NOTIF_HOST_EVENT_START |
				      TE_V2_NOTIF_HOST_EVENT_END);

	return iwl_mvm_time_event_send_add(mvm, vif, te_data, &time_cmd);
}

void iwl_mvm_stop_p2p_roc(struct iwl_mvm *mvm)
{
	struct iwl_mvm_vif *mvmvif;
	struct iwl_mvm_time_event_data *te_data;

	lockdep_assert_held(&mvm->mutex);

	/*
	 * Iterate over the list of time events and find the time event that is
	 * associated with a P2P_DEVICE interface.
	 * This assumes that a P2P_DEVICE interface can have only a single time
	 * event at any given time and this time event coresponds to a ROC
	 * request
	 */
	mvmvif = NULL;
	spin_lock_bh(&mvm->time_event_lock);
	list_for_each_entry(te_data, &mvm->time_event_list, list) {
		if (te_data->vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			mvmvif = iwl_mvm_vif_from_mac80211(te_data->vif);
			break;
		}
	}
	spin_unlock_bh(&mvm->time_event_lock);

	if (!mvmvif) {
		IWL_WARN(mvm, "P2P_DEVICE no remain on channel event\n");
		return;
	}

	iwl_mvm_remove_time_event(mvm, mvmvif, te_data);

	iwl_mvm_roc_finished(mvm);
}