Boot Linux faster!

Check our new training course

Boot Linux faster!

Check our new training course
and Creative Commons CC-BY-SA
lecture and lab materials

Bootlin logo

Elixir Cross Referencer

  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
/*
 * Copyright (c) 2013-2017 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/relay.h>
#include "core.h"
#include "debug.h"
#include "wmi-ops.h"

static void send_fft_sample(struct ath10k *ar,
			    const struct fft_sample_tlv *fft_sample_tlv)
{
	int length;

	if (!ar->spectral.rfs_chan_spec_scan)
		return;

	length = __be16_to_cpu(fft_sample_tlv->length) +
		 sizeof(*fft_sample_tlv);
	relay_write(ar->spectral.rfs_chan_spec_scan, fft_sample_tlv, length);
}

static uint8_t get_max_exp(s8 max_index, u16 max_magnitude, size_t bin_len,
			   u8 *data)
{
	int dc_pos;
	u8 max_exp;

	dc_pos = bin_len / 2;

	/* peak index outside of bins */
	if (dc_pos < max_index || -dc_pos >= max_index)
		return 0;

	for (max_exp = 0; max_exp < 8; max_exp++) {
		if (data[dc_pos + max_index] == (max_magnitude >> max_exp))
			break;
	}

	/* max_exp not found */
	if (data[dc_pos + max_index] != (max_magnitude >> max_exp))
		return 0;

	return max_exp;
}

static inline size_t ath10k_spectral_fix_bin_size(struct ath10k *ar,
						  size_t bin_len)
{
	/* some chipsets reports bin size as 2^n bytes + 'm' bytes in
	 * report mode 2. First 2^n bytes carries inband tones and last
	 * 'm' bytes carries band edge detection data mainly used in
	 * radar detection purpose. Strip last 'm' bytes to make bin size
	 * as a valid one. 'm' can take possible values of 4, 12.
	 */
	if (!is_power_of_2(bin_len))
		bin_len -= ar->hw_params.spectral_bin_discard;

	return bin_len;
}

int ath10k_spectral_process_fft(struct ath10k *ar,
				struct wmi_phyerr_ev_arg *phyerr,
				const struct phyerr_fft_report *fftr,
				size_t bin_len, u64 tsf)
{
	struct fft_sample_ath10k *fft_sample;
	u8 buf[sizeof(*fft_sample) + SPECTRAL_ATH10K_MAX_NUM_BINS];
	u16 freq1, freq2, total_gain_db, base_pwr_db, length, peak_mag;
	u32 reg0, reg1;
	u8 chain_idx, *bins;
	int dc_pos;

	fft_sample = (struct fft_sample_ath10k *)&buf;

	bin_len = ath10k_spectral_fix_bin_size(ar, bin_len);

	if (bin_len < 64 || bin_len > SPECTRAL_ATH10K_MAX_NUM_BINS)
		return -EINVAL;

	reg0 = __le32_to_cpu(fftr->reg0);
	reg1 = __le32_to_cpu(fftr->reg1);

	length = sizeof(*fft_sample) - sizeof(struct fft_sample_tlv) + bin_len;
	fft_sample->tlv.type = ATH_FFT_SAMPLE_ATH10K;
	fft_sample->tlv.length = __cpu_to_be16(length);

	/* TODO: there might be a reason why the hardware reports 20/40/80 MHz,
	 * but the results/plots suggest that its actually 22/44/88 MHz.
	 */
	switch (phyerr->chan_width_mhz) {
	case 20:
		fft_sample->chan_width_mhz = 22;
		break;
	case 40:
		fft_sample->chan_width_mhz = 44;
		break;
	case 80:
		/* TODO: As experiments with an analogue sender and various
		 * configurations (fft-sizes of 64/128/256 and 20/40/80 Mhz)
		 * show, the particular configuration of 80 MHz/64 bins does
		 * not match with the other samples at all. Until the reason
		 * for that is found, don't report these samples.
		 */
		if (bin_len == 64)
			return -EINVAL;
		fft_sample->chan_width_mhz = 88;
		break;
	default:
		fft_sample->chan_width_mhz = phyerr->chan_width_mhz;
	}

	fft_sample->relpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_RELPWR_DB);
	fft_sample->avgpwr_db = MS(reg1, SEARCH_FFT_REPORT_REG1_AVGPWR_DB);

	peak_mag = MS(reg1, SEARCH_FFT_REPORT_REG1_PEAK_MAG);
	fft_sample->max_magnitude = __cpu_to_be16(peak_mag);
	fft_sample->max_index = MS(reg0, SEARCH_FFT_REPORT_REG0_PEAK_SIDX);
	fft_sample->rssi = phyerr->rssi_combined;

	total_gain_db = MS(reg0, SEARCH_FFT_REPORT_REG0_TOTAL_GAIN_DB);
	base_pwr_db = MS(reg0, SEARCH_FFT_REPORT_REG0_BASE_PWR_DB);
	fft_sample->total_gain_db = __cpu_to_be16(total_gain_db);
	fft_sample->base_pwr_db = __cpu_to_be16(base_pwr_db);

	freq1 = phyerr->freq1;
	freq2 = phyerr->freq2;
	fft_sample->freq1 = __cpu_to_be16(freq1);
	fft_sample->freq2 = __cpu_to_be16(freq2);

	chain_idx = MS(reg0, SEARCH_FFT_REPORT_REG0_FFT_CHN_IDX);

	fft_sample->noise = __cpu_to_be16(phyerr->nf_chains[chain_idx]);

	bins = (u8 *)fftr;
	bins += sizeof(*fftr);

	fft_sample->tsf = __cpu_to_be64(tsf);

	/* max_exp has been directly reported by previous hardware (ath9k),
	 * maybe its possible to get it by other means?
	 */
	fft_sample->max_exp = get_max_exp(fft_sample->max_index, peak_mag,
					  bin_len, bins);

	memcpy(fft_sample->data, bins, bin_len);

	/* DC value (value in the middle) is the blind spot of the spectral
	 * sample and invalid, interpolate it.
	 */
	dc_pos = bin_len / 2;
	fft_sample->data[dc_pos] = (fft_sample->data[dc_pos + 1] +
				    fft_sample->data[dc_pos - 1]) / 2;

	send_fft_sample(ar, &fft_sample->tlv);

	return 0;
}

static struct ath10k_vif *ath10k_get_spectral_vdev(struct ath10k *ar)
{
	struct ath10k_vif *arvif;

	lockdep_assert_held(&ar->conf_mutex);

	if (list_empty(&ar->arvifs))
		return NULL;

	/* if there already is a vif doing spectral, return that. */
	list_for_each_entry(arvif, &ar->arvifs, list)
		if (arvif->spectral_enabled)
			return arvif;

	/* otherwise, return the first vif. */
	return list_first_entry(&ar->arvifs, typeof(*arvif), list);
}

static int ath10k_spectral_scan_trigger(struct ath10k *ar)
{
	struct ath10k_vif *arvif;
	int res;
	int vdev_id;

	lockdep_assert_held(&ar->conf_mutex);

	arvif = ath10k_get_spectral_vdev(ar);
	if (!arvif)
		return -ENODEV;
	vdev_id = arvif->vdev_id;

	if (ar->spectral.mode == SPECTRAL_DISABLED)
		return 0;

	res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
					      WMI_SPECTRAL_TRIGGER_CMD_CLEAR,
					      WMI_SPECTRAL_ENABLE_CMD_ENABLE);
	if (res < 0)
		return res;

	res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
					      WMI_SPECTRAL_TRIGGER_CMD_TRIGGER,
					      WMI_SPECTRAL_ENABLE_CMD_ENABLE);
	if (res < 0)
		return res;

	return 0;
}

static int ath10k_spectral_scan_config(struct ath10k *ar,
				       enum ath10k_spectral_mode mode)
{
	struct wmi_vdev_spectral_conf_arg arg;
	struct ath10k_vif *arvif;
	int vdev_id, count, res = 0;

	lockdep_assert_held(&ar->conf_mutex);

	arvif = ath10k_get_spectral_vdev(ar);
	if (!arvif)
		return -ENODEV;

	vdev_id = arvif->vdev_id;

	arvif->spectral_enabled = (mode != SPECTRAL_DISABLED);
	ar->spectral.mode = mode;

	res = ath10k_wmi_vdev_spectral_enable(ar, vdev_id,
					      WMI_SPECTRAL_TRIGGER_CMD_CLEAR,
					      WMI_SPECTRAL_ENABLE_CMD_DISABLE);
	if (res < 0) {
		ath10k_warn(ar, "failed to enable spectral scan: %d\n", res);
		return res;
	}

	if (mode == SPECTRAL_DISABLED)
		return 0;

	if (mode == SPECTRAL_BACKGROUND)
		count = WMI_SPECTRAL_COUNT_DEFAULT;
	else
		count = max_t(u8, 1, ar->spectral.config.count);

	arg.vdev_id = vdev_id;
	arg.scan_count = count;
	arg.scan_period = WMI_SPECTRAL_PERIOD_DEFAULT;
	arg.scan_priority = WMI_SPECTRAL_PRIORITY_DEFAULT;
	arg.scan_fft_size = ar->spectral.config.fft_size;
	arg.scan_gc_ena = WMI_SPECTRAL_GC_ENA_DEFAULT;
	arg.scan_restart_ena = WMI_SPECTRAL_RESTART_ENA_DEFAULT;
	arg.scan_noise_floor_ref = WMI_SPECTRAL_NOISE_FLOOR_REF_DEFAULT;
	arg.scan_init_delay = WMI_SPECTRAL_INIT_DELAY_DEFAULT;
	arg.scan_nb_tone_thr = WMI_SPECTRAL_NB_TONE_THR_DEFAULT;
	arg.scan_str_bin_thr = WMI_SPECTRAL_STR_BIN_THR_DEFAULT;
	arg.scan_wb_rpt_mode = WMI_SPECTRAL_WB_RPT_MODE_DEFAULT;
	arg.scan_rssi_rpt_mode = WMI_SPECTRAL_RSSI_RPT_MODE_DEFAULT;
	arg.scan_rssi_thr = WMI_SPECTRAL_RSSI_THR_DEFAULT;
	arg.scan_pwr_format = WMI_SPECTRAL_PWR_FORMAT_DEFAULT;
	arg.scan_rpt_mode = WMI_SPECTRAL_RPT_MODE_DEFAULT;
	arg.scan_bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT;
	arg.scan_dbm_adj = WMI_SPECTRAL_DBM_ADJ_DEFAULT;
	arg.scan_chn_mask = WMI_SPECTRAL_CHN_MASK_DEFAULT;

	res = ath10k_wmi_vdev_spectral_conf(ar, &arg);
	if (res < 0) {
		ath10k_warn(ar, "failed to configure spectral scan: %d\n", res);
		return res;
	}

	return 0;
}

static ssize_t read_file_spec_scan_ctl(struct file *file, char __user *user_buf,
				       size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	char *mode = "";
	size_t len;
	enum ath10k_spectral_mode spectral_mode;

	mutex_lock(&ar->conf_mutex);
	spectral_mode = ar->spectral.mode;
	mutex_unlock(&ar->conf_mutex);

	switch (spectral_mode) {
	case SPECTRAL_DISABLED:
		mode = "disable";
		break;
	case SPECTRAL_BACKGROUND:
		mode = "background";
		break;
	case SPECTRAL_MANUAL:
		mode = "manual";
		break;
	}

	len = strlen(mode);
	return simple_read_from_buffer(user_buf, count, ppos, mode, len);
}

static ssize_t write_file_spec_scan_ctl(struct file *file,
					const char __user *user_buf,
					size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	char buf[32];
	ssize_t len;
	int res;

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;

	buf[len] = '\0';

	mutex_lock(&ar->conf_mutex);

	if (strncmp("trigger", buf, 7) == 0) {
		if (ar->spectral.mode == SPECTRAL_MANUAL ||
		    ar->spectral.mode == SPECTRAL_BACKGROUND) {
			/* reset the configuration to adopt possibly changed
			 * debugfs parameters
			 */
			res = ath10k_spectral_scan_config(ar,
							  ar->spectral.mode);
			if (res < 0) {
				ath10k_warn(ar, "failed to reconfigure spectral scan: %d\n",
					    res);
			}
			res = ath10k_spectral_scan_trigger(ar);
			if (res < 0) {
				ath10k_warn(ar, "failed to trigger spectral scan: %d\n",
					    res);
			}
		} else {
			res = -EINVAL;
		}
	} else if (strncmp("background", buf, 10) == 0) {
		res = ath10k_spectral_scan_config(ar, SPECTRAL_BACKGROUND);
	} else if (strncmp("manual", buf, 6) == 0) {
		res = ath10k_spectral_scan_config(ar, SPECTRAL_MANUAL);
	} else if (strncmp("disable", buf, 7) == 0) {
		res = ath10k_spectral_scan_config(ar, SPECTRAL_DISABLED);
	} else {
		res = -EINVAL;
	}

	mutex_unlock(&ar->conf_mutex);

	if (res < 0)
		return res;

	return count;
}

static const struct file_operations fops_spec_scan_ctl = {
	.read = read_file_spec_scan_ctl,
	.write = write_file_spec_scan_ctl,
	.open = simple_open,
	.owner = THIS_MODULE,
	.llseek = default_llseek,
};

static ssize_t read_file_spectral_count(struct file *file,
					char __user *user_buf,
					size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	char buf[32];
	size_t len;
	u8 spectral_count;

	mutex_lock(&ar->conf_mutex);
	spectral_count = ar->spectral.config.count;
	mutex_unlock(&ar->conf_mutex);

	len = sprintf(buf, "%d\n", spectral_count);
	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}

static ssize_t write_file_spectral_count(struct file *file,
					 const char __user *user_buf,
					 size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	unsigned long val;
	char buf[32];
	ssize_t len;

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;

	buf[len] = '\0';
	if (kstrtoul(buf, 0, &val))
		return -EINVAL;

	if (val > 255)
		return -EINVAL;

	mutex_lock(&ar->conf_mutex);
	ar->spectral.config.count = val;
	mutex_unlock(&ar->conf_mutex);

	return count;
}

static const struct file_operations fops_spectral_count = {
	.read = read_file_spectral_count,
	.write = write_file_spectral_count,
	.open = simple_open,
	.owner = THIS_MODULE,
	.llseek = default_llseek,
};

static ssize_t read_file_spectral_bins(struct file *file,
				       char __user *user_buf,
				       size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	char buf[32];
	unsigned int bins, fft_size, bin_scale;
	size_t len;

	mutex_lock(&ar->conf_mutex);

	fft_size = ar->spectral.config.fft_size;
	bin_scale = WMI_SPECTRAL_BIN_SCALE_DEFAULT;
	bins = 1 << (fft_size - bin_scale);

	mutex_unlock(&ar->conf_mutex);

	len = sprintf(buf, "%d\n", bins);
	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}

static ssize_t write_file_spectral_bins(struct file *file,
					const char __user *user_buf,
					size_t count, loff_t *ppos)
{
	struct ath10k *ar = file->private_data;
	unsigned long val;
	char buf[32];
	ssize_t len;

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;

	buf[len] = '\0';
	if (kstrtoul(buf, 0, &val))
		return -EINVAL;

	if (val < 64 || val > SPECTRAL_ATH10K_MAX_NUM_BINS)
		return -EINVAL;

	if (!is_power_of_2(val))
		return -EINVAL;

	mutex_lock(&ar->conf_mutex);
	ar->spectral.config.fft_size = ilog2(val);
	ar->spectral.config.fft_size += WMI_SPECTRAL_BIN_SCALE_DEFAULT;
	mutex_unlock(&ar->conf_mutex);

	return count;
}

static const struct file_operations fops_spectral_bins = {
	.read = read_file_spectral_bins,
	.write = write_file_spectral_bins,
	.open = simple_open,
	.owner = THIS_MODULE,
	.llseek = default_llseek,
};

static struct dentry *create_buf_file_handler(const char *filename,
					      struct dentry *parent,
					      umode_t mode,
					      struct rchan_buf *buf,
					      int *is_global)
{
	struct dentry *buf_file;

	buf_file = debugfs_create_file(filename, mode, parent, buf,
				       &relay_file_operations);
	*is_global = 1;
	return buf_file;
}

static int remove_buf_file_handler(struct dentry *dentry)
{
	debugfs_remove(dentry);

	return 0;
}

static struct rchan_callbacks rfs_spec_scan_cb = {
	.create_buf_file = create_buf_file_handler,
	.remove_buf_file = remove_buf_file_handler,
};

int ath10k_spectral_start(struct ath10k *ar)
{
	struct ath10k_vif *arvif;

	lockdep_assert_held(&ar->conf_mutex);

	list_for_each_entry(arvif, &ar->arvifs, list)
		arvif->spectral_enabled = 0;

	ar->spectral.mode = SPECTRAL_DISABLED;
	ar->spectral.config.count = WMI_SPECTRAL_COUNT_DEFAULT;
	ar->spectral.config.fft_size = WMI_SPECTRAL_FFT_SIZE_DEFAULT;

	return 0;
}

int ath10k_spectral_vif_stop(struct ath10k_vif *arvif)
{
	if (!arvif->spectral_enabled)
		return 0;

	return ath10k_spectral_scan_config(arvif->ar, SPECTRAL_DISABLED);
}

int ath10k_spectral_create(struct ath10k *ar)
{
	/* The buffer size covers whole channels in dual bands up to 128 bins.
	 * Scan with bigger than 128 bins needs to be run on single band each.
	 */
	ar->spectral.rfs_chan_spec_scan = relay_open("spectral_scan",
						     ar->debug.debugfs_phy,
						     1140, 2500,
						     &rfs_spec_scan_cb, NULL);
	debugfs_create_file("spectral_scan_ctl",
			    0600,
			    ar->debug.debugfs_phy, ar,
			    &fops_spec_scan_ctl);
	debugfs_create_file("spectral_count",
			    0600,
			    ar->debug.debugfs_phy, ar,
			    &fops_spectral_count);
	debugfs_create_file("spectral_bins",
			    0600,
			    ar->debug.debugfs_phy, ar,
			    &fops_spectral_bins);

	return 0;
}

void ath10k_spectral_destroy(struct ath10k *ar)
{
	if (ar->spectral.rfs_chan_spec_scan) {
		relay_close(ar->spectral.rfs_chan_spec_scan);
		ar->spectral.rfs_chan_spec_scan = NULL;
	}
}