summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/iwl-sv-open.c
blob: c00aa5a1b8b8bdd1aab8bf61079d7e88f7da736c (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
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
/******************************************************************************
 *
 * 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) 2010 - 2011 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 LICENSE.GPL.
 *
 * 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) 2010 - 2011 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/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <linux/netdevice.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <net/netlink.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-debug.h"
#include "iwl-fh.h"
#include "iwl-io.h"
#include "iwl-agn.h"
#include "iwl-testmode.h"


/* The TLVs used in the gnl message policy between the kernel module and
 * user space application. iwl_testmode_gnl_msg_policy is to be carried
 * through the NL80211_CMD_TESTMODE channel regulated by nl80211.
 * See iwl-testmode.h
 */
static
struct nla_policy iwl_testmode_gnl_msg_policy[IWL_TM_ATTR_MAX] = {
	[IWL_TM_ATTR_COMMAND] = { .type = NLA_U32, },

	[IWL_TM_ATTR_UCODE_CMD_ID] = { .type = NLA_U8, },
	[IWL_TM_ATTR_UCODE_CMD_DATA] = { .type = NLA_UNSPEC, },

	[IWL_TM_ATTR_REG_OFFSET] = { .type = NLA_U32, },
	[IWL_TM_ATTR_REG_VALUE8] = { .type = NLA_U8, },
	[IWL_TM_ATTR_REG_VALUE32] = { .type = NLA_U32, },

	[IWL_TM_ATTR_SYNC_RSP] = { .type = NLA_UNSPEC, },
	[IWL_TM_ATTR_UCODE_RX_PKT] = { .type = NLA_UNSPEC, },

	[IWL_TM_ATTR_EEPROM] = { .type = NLA_UNSPEC, },

	[IWL_TM_ATTR_TRACE_ADDR] = { .type = NLA_UNSPEC, },
	[IWL_TM_ATTR_TRACE_DUMP] = { .type = NLA_UNSPEC, },
	[IWL_TM_ATTR_TRACE_SIZE] = { .type = NLA_U32, },

	[IWL_TM_ATTR_FIXRATE] = { .type = NLA_U32, },

};

/*
 * See the struct iwl_rx_packet in iwl-commands.h for the format of the
 * received events from the device
 */
static inline int get_event_length(struct iwl_rx_mem_buffer *rxb)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	if (pkt)
		return le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
	else
		return 0;
}


/*
 * This function multicasts the spontaneous messages from the device to the
 * user space. It is invoked whenever there is a received messages
 * from the device. This function is called within the ISR of the rx handlers
 * in iwlagn driver.
 *
 * The parsing of the message content is left to the user space application,
 * The message content is treated as unattacked raw data and is encapsulated
 * with IWL_TM_ATTR_UCODE_RX_PKT multicasting to the user space.
 *
 * @priv: the instance of iwlwifi device
 * @rxb: pointer to rx data content received by the ISR
 *
 * See the message policies and TLVs in iwl_testmode_gnl_msg_policy[].
 * For the messages multicasting to the user application, the mandatory
 * TLV fields are :
 *	IWL_TM_ATTR_COMMAND must be IWL_TM_CMD_DEV2APP_UCODE_RX_PKT
 *	IWL_TM_ATTR_UCODE_RX_PKT for carrying the message content
 */

static void iwl_testmode_ucode_rx_pkt(struct iwl_priv *priv,
				struct iwl_rx_mem_buffer *rxb)
{
	struct ieee80211_hw *hw = priv->hw;
	struct sk_buff *skb;
	void *data;
	int length;

	data = (void *)rxb_addr(rxb);
	length = get_event_length(rxb);

	if (!data || length == 0)
		return;

	skb = cfg80211_testmode_alloc_event_skb(hw->wiphy, 20 + length,
								GFP_ATOMIC);
	if (skb == NULL) {
		IWL_DEBUG_INFO(priv,
			 "Run out of memory for messages to user space ?\n");
		return;
	}
	NLA_PUT_U32(skb, IWL_TM_ATTR_COMMAND, IWL_TM_CMD_DEV2APP_UCODE_RX_PKT);
	NLA_PUT(skb, IWL_TM_ATTR_UCODE_RX_PKT, length, data);
	cfg80211_testmode_event(skb, GFP_ATOMIC);
	return;

nla_put_failure:
	kfree_skb(skb);
	IWL_DEBUG_INFO(priv, "Ouch, overran buffer, check allocation!\n");
}

void iwl_testmode_init(struct iwl_priv *priv)
{
	priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
	priv->testmode_trace.trace_enabled = false;
}

static void iwl_trace_cleanup(struct iwl_priv *priv)
{
	struct device *dev = priv->bus.dev;

	if (priv->testmode_trace.trace_enabled) {
		if (priv->testmode_trace.cpu_addr &&
		    priv->testmode_trace.dma_addr)
			dma_free_coherent(dev,
					priv->testmode_trace.total_size,
					priv->testmode_trace.cpu_addr,
					priv->testmode_trace.dma_addr);
		priv->testmode_trace.trace_enabled = false;
		priv->testmode_trace.cpu_addr = NULL;
		priv->testmode_trace.trace_addr = NULL;
		priv->testmode_trace.dma_addr = 0;
		priv->testmode_trace.buff_size = 0;
		priv->testmode_trace.total_size = 0;
	}
}


void iwl_testmode_cleanup(struct iwl_priv *priv)
{
	iwl_trace_cleanup(priv);
}

/*
 * This function handles the user application commands to the ucode.
 *
 * It retrieves the mandatory fields IWL_TM_ATTR_UCODE_CMD_ID and
 * IWL_TM_ATTR_UCODE_CMD_DATA and calls to the handler to send the
 * host command to the ucode.
 *
 * If any mandatory field is missing, -ENOMSG is replied to the user space
 * application; otherwise, the actual execution result of the host command to
 * ucode is replied.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_ucode(struct ieee80211_hw *hw, struct nlattr **tb)
{
	struct iwl_priv *priv = hw->priv;
	struct iwl_host_cmd cmd;

	memset(&cmd, 0, sizeof(struct iwl_host_cmd));

	if (!tb[IWL_TM_ATTR_UCODE_CMD_ID] ||
	    !tb[IWL_TM_ATTR_UCODE_CMD_DATA]) {
		IWL_DEBUG_INFO(priv,
			"Error finding ucode command mandatory fields\n");
		return -ENOMSG;
	}

	cmd.id = nla_get_u8(tb[IWL_TM_ATTR_UCODE_CMD_ID]);
	cmd.data[0] = nla_data(tb[IWL_TM_ATTR_UCODE_CMD_DATA]);
	cmd.len[0] = nla_len(tb[IWL_TM_ATTR_UCODE_CMD_DATA]);
	cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
	IWL_INFO(priv, "testmode ucode command ID 0x%x, flags 0x%x,"
				" len %d\n", cmd.id, cmd.flags, cmd.len[0]);
	/* ok, let's submit the command to ucode */
	return iwl_send_cmd(priv, &cmd);
}


/*
 * This function handles the user application commands for register access.
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is returned; or -ENOMSG if the
 * mandatory fields(IWL_TM_ATTR_REG_OFFSET,IWL_TM_ATTR_REG_VALUE32,
 * IWL_TM_ATTR_REG_VALUE8) are missing; Otherwise 0 is replied indicating
 * the success of the command execution.
 *
 * If IWL_TM_ATTR_COMMAND is IWL_TM_CMD_APP2DEV_REG_READ32, the register read
 * value is returned with IWL_TM_ATTR_REG_VALUE32.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_reg(struct ieee80211_hw *hw, struct nlattr **tb)
{
	struct iwl_priv *priv = hw->priv;
	u32 ofs, val32;
	u8 val8;
	struct sk_buff *skb;
	int status = 0;

	if (!tb[IWL_TM_ATTR_REG_OFFSET]) {
		IWL_DEBUG_INFO(priv, "Error finding register offset\n");
		return -ENOMSG;
	}
	ofs = nla_get_u32(tb[IWL_TM_ATTR_REG_OFFSET]);
	IWL_INFO(priv, "testmode register access command offset 0x%x\n", ofs);

	switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
	case IWL_TM_CMD_APP2DEV_REG_READ32:
		val32 = iwl_read32(priv, ofs);
		IWL_INFO(priv, "32bit value to read 0x%x\n", val32);

		skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy, 20);
		if (!skb) {
			IWL_DEBUG_INFO(priv, "Error allocating memory\n");
			return -ENOMEM;
		}
		NLA_PUT_U32(skb, IWL_TM_ATTR_REG_VALUE32, val32);
		status = cfg80211_testmode_reply(skb);
		if (status < 0)
			IWL_DEBUG_INFO(priv,
				       "Error sending msg : %d\n", status);
		break;
	case IWL_TM_CMD_APP2DEV_REG_WRITE32:
		if (!tb[IWL_TM_ATTR_REG_VALUE32]) {
			IWL_DEBUG_INFO(priv,
				       "Error finding value to write\n");
			return -ENOMSG;
		} else {
			val32 = nla_get_u32(tb[IWL_TM_ATTR_REG_VALUE32]);
			IWL_INFO(priv, "32bit value to write 0x%x\n", val32);
			iwl_write32(priv, ofs, val32);
		}
		break;
	case IWL_TM_CMD_APP2DEV_REG_WRITE8:
		if (!tb[IWL_TM_ATTR_REG_VALUE8]) {
			IWL_DEBUG_INFO(priv, "Error finding value to write\n");
			return -ENOMSG;
		} else {
			val8 = nla_get_u8(tb[IWL_TM_ATTR_REG_VALUE8]);
			IWL_INFO(priv, "8bit value to write 0x%x\n", val8);
			iwl_write8(priv, ofs, val8);
		}
		break;
	default:
		IWL_DEBUG_INFO(priv, "Unknown testmode register command ID\n");
		return -ENOSYS;
	}

	return status;

nla_put_failure:
	kfree_skb(skb);
	return -EMSGSIZE;
}


static int iwl_testmode_cfg_init_calib(struct iwl_priv *priv)
{
	struct iwl_notification_wait calib_wait;
	int ret;

	iwlagn_init_notification_wait(priv, &calib_wait,
				      CALIBRATION_COMPLETE_NOTIFICATION,
				      NULL, NULL);
	ret = iwlagn_init_alive_start(priv);
	if (ret) {
		IWL_DEBUG_INFO(priv,
			"Error configuring init calibration: %d\n", ret);
		goto cfg_init_calib_error;
	}

	ret = iwlagn_wait_notification(priv, &calib_wait, 2 * HZ);
	if (ret)
		IWL_DEBUG_INFO(priv, "Error detecting"
			" CALIBRATION_COMPLETE_NOTIFICATION: %d\n", ret);
	return ret;

cfg_init_calib_error:
	iwlagn_remove_notification(priv, &calib_wait);
	return ret;
}

/*
 * This function handles the user application commands for driver.
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is replied; otherwise, the returned
 * value of the actual command execution is replied to the user application.
 *
 * If there's any message responding to the user space, IWL_TM_ATTR_SYNC_RSP
 * is used for carry the message while IWL_TM_ATTR_COMMAND must set to
 * IWL_TM_CMD_DEV2APP_SYNC_RSP.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_driver(struct ieee80211_hw *hw, struct nlattr **tb)
{
	struct iwl_priv *priv = hw->priv;
	struct sk_buff *skb;
	unsigned char *rsp_data_ptr = NULL;
	int status = 0, rsp_data_len = 0;

	switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
	case IWL_TM_CMD_APP2DEV_GET_DEVICENAME:
		rsp_data_ptr = (unsigned char *)priv->cfg->name;
		rsp_data_len = strlen(priv->cfg->name);
		skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
							rsp_data_len + 20);
		if (!skb) {
			IWL_DEBUG_INFO(priv,
				       "Error allocating memory\n");
			return -ENOMEM;
		}
		NLA_PUT_U32(skb, IWL_TM_ATTR_COMMAND,
			    IWL_TM_CMD_DEV2APP_SYNC_RSP);
		NLA_PUT(skb, IWL_TM_ATTR_SYNC_RSP,
			rsp_data_len, rsp_data_ptr);
		status = cfg80211_testmode_reply(skb);
		if (status < 0)
			IWL_DEBUG_INFO(priv, "Error sending msg : %d\n",
				       status);
		break;

	case IWL_TM_CMD_APP2DEV_LOAD_INIT_FW:
		status = iwlagn_load_ucode_wait_alive(priv, &priv->ucode_init,
						      IWL_UCODE_INIT);
		if (status)
			IWL_DEBUG_INFO(priv,
				"Error loading init ucode: %d\n", status);
		break;

	case IWL_TM_CMD_APP2DEV_CFG_INIT_CALIB:
		iwl_testmode_cfg_init_calib(priv);
		iwlagn_stop_device(priv);
		break;

	case IWL_TM_CMD_APP2DEV_LOAD_RUNTIME_FW:
		status = iwlagn_load_ucode_wait_alive(priv,
					   &priv->ucode_rt,
					   IWL_UCODE_REGULAR);
		if (status) {
			IWL_DEBUG_INFO(priv,
				"Error loading runtime ucode: %d\n", status);
			break;
		}
		status = iwl_alive_start(priv);
		if (status)
			IWL_DEBUG_INFO(priv,
				"Error starting the device: %d\n", status);
		break;

	case IWL_TM_CMD_APP2DEV_GET_EEPROM:
		if (priv->eeprom) {
			skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
				priv->cfg->base_params->eeprom_size + 20);
			if (!skb) {
				IWL_DEBUG_INFO(priv,
				       "Error allocating memory\n");
				return -ENOMEM;
			}
			NLA_PUT_U32(skb, IWL_TM_ATTR_COMMAND,
				IWL_TM_CMD_DEV2APP_EEPROM_RSP);
			NLA_PUT(skb, IWL_TM_ATTR_EEPROM,
				priv->cfg->base_params->eeprom_size,
				priv->eeprom);
			status = cfg80211_testmode_reply(skb);
			if (status < 0)
				IWL_DEBUG_INFO(priv,
					       "Error sending msg : %d\n",
					       status);
		} else
			return -EFAULT;
		break;

	case IWL_TM_CMD_APP2DEV_FIXRATE_REQ:
		if (!tb[IWL_TM_ATTR_FIXRATE]) {
			IWL_DEBUG_INFO(priv,
				       "Error finding fixrate setting\n");
			return -ENOMSG;
		}
		priv->dbg_fixed_rate = nla_get_u32(tb[IWL_TM_ATTR_FIXRATE]);
		break;

	default:
		IWL_DEBUG_INFO(priv, "Unknown testmode driver command ID\n");
		return -ENOSYS;
	}
	return status;

nla_put_failure:
	kfree_skb(skb);
	return -EMSGSIZE;
}


/*
 * This function handles the user application commands for uCode trace
 *
 * It retrieves command ID carried with IWL_TM_ATTR_COMMAND and calls to the
 * handlers respectively.
 *
 * If it's an unknown commdn ID, -ENOSYS is replied; otherwise, the returned
 * value of the actual command execution is replied to the user application.
 *
 * @hw: ieee80211_hw object that represents the device
 * @tb: gnl message fields from the user space
 */
static int iwl_testmode_trace(struct ieee80211_hw *hw, struct nlattr **tb)
{
	struct iwl_priv *priv = hw->priv;
	struct sk_buff *skb;
	int status = 0;
	struct device *dev = priv->bus.dev;

	switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
	case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
		if (priv->testmode_trace.trace_enabled)
			return -EBUSY;

		if (!tb[IWL_TM_ATTR_TRACE_SIZE])
			priv->testmode_trace.buff_size = TRACE_BUFF_SIZE_DEF;
		else
			priv->testmode_trace.buff_size =
				nla_get_u32(tb[IWL_TM_ATTR_TRACE_SIZE]);
		if (!priv->testmode_trace.buff_size)
			return -EINVAL;
		if (priv->testmode_trace.buff_size < TRACE_BUFF_SIZE_MIN ||
		    priv->testmode_trace.buff_size > TRACE_BUFF_SIZE_MAX)
			return -EINVAL;

		priv->testmode_trace.total_size =
			priv->testmode_trace.buff_size + TRACE_BUFF_PADD;
		priv->testmode_trace.cpu_addr =
			dma_alloc_coherent(dev,
					   priv->testmode_trace.total_size,
					   &priv->testmode_trace.dma_addr,
					   GFP_KERNEL);
		if (!priv->testmode_trace.cpu_addr)
			return -ENOMEM;
		priv->testmode_trace.trace_enabled = true;
		priv->testmode_trace.trace_addr = (u8 *)PTR_ALIGN(
			priv->testmode_trace.cpu_addr, 0x100);
		memset(priv->testmode_trace.trace_addr, 0x03B,
			priv->testmode_trace.buff_size);
		skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
			sizeof(priv->testmode_trace.dma_addr) + 20);
		if (!skb) {
			IWL_DEBUG_INFO(priv,
				"Error allocating memory\n");
			iwl_trace_cleanup(priv);
			return -ENOMEM;
		}
		NLA_PUT(skb, IWL_TM_ATTR_TRACE_ADDR,
			sizeof(priv->testmode_trace.dma_addr),
			(u64 *)&priv->testmode_trace.dma_addr);
		status = cfg80211_testmode_reply(skb);
		if (status < 0) {
			IWL_DEBUG_INFO(priv,
				       "Error sending msg : %d\n",
				       status);
		}
		priv->testmode_trace.num_chunks =
			DIV_ROUND_UP(priv->testmode_trace.buff_size,
				     TRACE_CHUNK_SIZE);
		break;

	case IWL_TM_CMD_APP2DEV_END_TRACE:
		iwl_trace_cleanup(priv);
		break;
	default:
		IWL_DEBUG_INFO(priv, "Unknown testmode mem command ID\n");
		return -ENOSYS;
	}
	return status;

nla_put_failure:
	kfree_skb(skb);
	if (nla_get_u32(tb[IWL_TM_ATTR_COMMAND]) ==
	    IWL_TM_CMD_APP2DEV_BEGIN_TRACE)
		iwl_trace_cleanup(priv);
	return -EMSGSIZE;
}

static int iwl_testmode_trace_dump(struct ieee80211_hw *hw, struct nlattr **tb,
				   struct sk_buff *skb,
				   struct netlink_callback *cb)
{
	struct iwl_priv *priv = hw->priv;
	int idx, length;

	if (priv->testmode_trace.trace_enabled &&
	    priv->testmode_trace.trace_addr) {
		idx = cb->args[4];
		if (idx >= priv->testmode_trace.num_chunks)
			return -ENOENT;
		length = TRACE_CHUNK_SIZE;
		if (((idx + 1) == priv->testmode_trace.num_chunks) &&
		    (priv->testmode_trace.buff_size % TRACE_CHUNK_SIZE))
			length = priv->testmode_trace.buff_size %
				TRACE_CHUNK_SIZE;

		NLA_PUT(skb, IWL_TM_ATTR_TRACE_DUMP, length,
			priv->testmode_trace.trace_addr +
			(TRACE_CHUNK_SIZE * idx));
		idx++;
		cb->args[4] = idx;
		return 0;
	} else
		return -EFAULT;

 nla_put_failure:
	return -ENOBUFS;
}

/* The testmode gnl message handler that takes the gnl message from the
 * user space and parses it per the policy iwl_testmode_gnl_msg_policy, then
 * invoke the corresponding handlers.
 *
 * This function is invoked when there is user space application sending
 * gnl message through the testmode tunnel NL80211_CMD_TESTMODE regulated
 * by nl80211.
 *
 * It retrieves the mandatory field, IWL_TM_ATTR_COMMAND, before
 * dispatching it to the corresponding handler.
 *
 * If IWL_TM_ATTR_COMMAND is missing, -ENOMSG is replied to user application;
 * -ENOSYS is replied to the user application if the command is unknown;
 * Otherwise, the command is dispatched to the respective handler.
 *
 * @hw: ieee80211_hw object that represents the device
 * @data: pointer to user space message
 * @len: length in byte of @data
 */
int iwl_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
{
	struct nlattr *tb[IWL_TM_ATTR_MAX - 1];
	struct iwl_priv *priv = hw->priv;
	int result;

	result = nla_parse(tb, IWL_TM_ATTR_MAX - 1, data, len,
			iwl_testmode_gnl_msg_policy);
	if (result != 0) {
		IWL_DEBUG_INFO(priv,
			       "Error parsing the gnl message : %d\n", result);
		return result;
	}

	/* IWL_TM_ATTR_COMMAND is absolutely mandatory */
	if (!tb[IWL_TM_ATTR_COMMAND]) {
		IWL_DEBUG_INFO(priv, "Error finding testmode command type\n");
		return -ENOMSG;
	}
	/* in case multiple accesses to the device happens */
	mutex_lock(&priv->mutex);

	switch (nla_get_u32(tb[IWL_TM_ATTR_COMMAND])) {
	case IWL_TM_CMD_APP2DEV_UCODE:
		IWL_DEBUG_INFO(priv, "testmode cmd to uCode\n");
		result = iwl_testmode_ucode(hw, tb);
		break;
	case IWL_TM_CMD_APP2DEV_REG_READ32:
	case IWL_TM_CMD_APP2DEV_REG_WRITE32:
	case IWL_TM_CMD_APP2DEV_REG_WRITE8:
		IWL_DEBUG_INFO(priv, "testmode cmd to register\n");
		result = iwl_testmode_reg(hw, tb);
		break;
	case IWL_TM_CMD_APP2DEV_GET_DEVICENAME:
	case IWL_TM_CMD_APP2DEV_LOAD_INIT_FW:
	case IWL_TM_CMD_APP2DEV_CFG_INIT_CALIB:
	case IWL_TM_CMD_APP2DEV_LOAD_RUNTIME_FW:
	case IWL_TM_CMD_APP2DEV_GET_EEPROM:
	case IWL_TM_CMD_APP2DEV_FIXRATE_REQ:
		IWL_DEBUG_INFO(priv, "testmode cmd to driver\n");
		result = iwl_testmode_driver(hw, tb);
		break;

	case IWL_TM_CMD_APP2DEV_BEGIN_TRACE:
	case IWL_TM_CMD_APP2DEV_END_TRACE:
	case IWL_TM_CMD_APP2DEV_READ_TRACE:
		IWL_DEBUG_INFO(priv, "testmode uCode trace cmd to driver\n");
		result = iwl_testmode_trace(hw, tb);
		break;

	default:
		IWL_DEBUG_INFO(priv, "Unknown testmode command\n");
		result = -ENOSYS;
		break;
	}

	mutex_unlock(&priv->mutex);
	return result;
}

int iwl_testmode_dump(struct ieee80211_hw *hw, struct sk_buff *skb,
		      struct netlink_callback *cb,
		      void *data, int len)
{
	struct nlattr *tb[IWL_TM_ATTR_MAX];
	struct iwl_priv *priv = hw->priv;
	int result;
	u32 cmd;

	if (cb->args[3]) {
		/* offset by 1 since commands start at 0 */
		cmd = cb->args[3] - 1;
	} else {
		result = nla_parse(tb, IWL_TM_ATTR_MAX - 1, data, len,
				iwl_testmode_gnl_msg_policy);
		if (result) {
			IWL_DEBUG_INFO(priv,
			       "Error parsing the gnl message : %d\n", result);
			return result;
		}

		/* IWL_TM_ATTR_COMMAND is absolutely mandatory */
		if (!tb[IWL_TM_ATTR_COMMAND]) {
			IWL_DEBUG_INFO(priv,
				"Error finding testmode command type\n");
			return -ENOMSG;
		}
		cmd = nla_get_u32(tb[IWL_TM_ATTR_COMMAND]);
		cb->args[3] = cmd + 1;
	}

	/* in case multiple accesses to the device happens */
	mutex_lock(&priv->mutex);
	switch (cmd) {
	case IWL_TM_CMD_APP2DEV_READ_TRACE:
		IWL_DEBUG_INFO(priv, "uCode trace cmd to driver\n");
		result = iwl_testmode_trace_dump(hw, tb, skb, cb);
		break;
	default:
		result = -EINVAL;
		break;
	}

	mutex_unlock(&priv->mutex);
	return result;
}