summaryrefslogtreecommitdiff
path: root/sound/virtio/virtio_pcm.c
blob: e16567e2e21458423162e3b0853513de4f3cbd2c (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * virtio-snd: Virtio sound device
 * Copyright (C) 2021 OpenSynergy GmbH
 */
#include <linux/moduleparam.h>
#include <linux/virtio_config.h>

#include "virtio_card.h"

static u32 pcm_buffer_ms = 160;
module_param(pcm_buffer_ms, uint, 0644);
MODULE_PARM_DESC(pcm_buffer_ms, "PCM substream buffer time in milliseconds");

static u32 pcm_periods_min = 2;
module_param(pcm_periods_min, uint, 0644);
MODULE_PARM_DESC(pcm_periods_min, "Minimum number of PCM periods");

static u32 pcm_periods_max = 16;
module_param(pcm_periods_max, uint, 0644);
MODULE_PARM_DESC(pcm_periods_max, "Maximum number of PCM periods");

static u32 pcm_period_ms_min = 10;
module_param(pcm_period_ms_min, uint, 0644);
MODULE_PARM_DESC(pcm_period_ms_min, "Minimum PCM period time in milliseconds");

static u32 pcm_period_ms_max = 80;
module_param(pcm_period_ms_max, uint, 0644);
MODULE_PARM_DESC(pcm_period_ms_max, "Maximum PCM period time in milliseconds");

/* Map for converting VirtIO format to ALSA format. */
static const snd_pcm_format_t g_v2a_format_map[] = {
	[VIRTIO_SND_PCM_FMT_IMA_ADPCM] = SNDRV_PCM_FORMAT_IMA_ADPCM,
	[VIRTIO_SND_PCM_FMT_MU_LAW] = SNDRV_PCM_FORMAT_MU_LAW,
	[VIRTIO_SND_PCM_FMT_A_LAW] = SNDRV_PCM_FORMAT_A_LAW,
	[VIRTIO_SND_PCM_FMT_S8] = SNDRV_PCM_FORMAT_S8,
	[VIRTIO_SND_PCM_FMT_U8] = SNDRV_PCM_FORMAT_U8,
	[VIRTIO_SND_PCM_FMT_S16] = SNDRV_PCM_FORMAT_S16_LE,
	[VIRTIO_SND_PCM_FMT_U16] = SNDRV_PCM_FORMAT_U16_LE,
	[VIRTIO_SND_PCM_FMT_S18_3] = SNDRV_PCM_FORMAT_S18_3LE,
	[VIRTIO_SND_PCM_FMT_U18_3] = SNDRV_PCM_FORMAT_U18_3LE,
	[VIRTIO_SND_PCM_FMT_S20_3] = SNDRV_PCM_FORMAT_S20_3LE,
	[VIRTIO_SND_PCM_FMT_U20_3] = SNDRV_PCM_FORMAT_U20_3LE,
	[VIRTIO_SND_PCM_FMT_S24_3] = SNDRV_PCM_FORMAT_S24_3LE,
	[VIRTIO_SND_PCM_FMT_U24_3] = SNDRV_PCM_FORMAT_U24_3LE,
	[VIRTIO_SND_PCM_FMT_S20] = SNDRV_PCM_FORMAT_S20_LE,
	[VIRTIO_SND_PCM_FMT_U20] = SNDRV_PCM_FORMAT_U20_LE,
	[VIRTIO_SND_PCM_FMT_S24] = SNDRV_PCM_FORMAT_S24_LE,
	[VIRTIO_SND_PCM_FMT_U24] = SNDRV_PCM_FORMAT_U24_LE,
	[VIRTIO_SND_PCM_FMT_S32] = SNDRV_PCM_FORMAT_S32_LE,
	[VIRTIO_SND_PCM_FMT_U32] = SNDRV_PCM_FORMAT_U32_LE,
	[VIRTIO_SND_PCM_FMT_FLOAT] = SNDRV_PCM_FORMAT_FLOAT_LE,
	[VIRTIO_SND_PCM_FMT_FLOAT64] = SNDRV_PCM_FORMAT_FLOAT64_LE,
	[VIRTIO_SND_PCM_FMT_DSD_U8] = SNDRV_PCM_FORMAT_DSD_U8,
	[VIRTIO_SND_PCM_FMT_DSD_U16] = SNDRV_PCM_FORMAT_DSD_U16_LE,
	[VIRTIO_SND_PCM_FMT_DSD_U32] = SNDRV_PCM_FORMAT_DSD_U32_LE,
	[VIRTIO_SND_PCM_FMT_IEC958_SUBFRAME] =
		SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
};

/* Map for converting VirtIO frame rate to ALSA frame rate. */
struct virtsnd_v2a_rate {
	unsigned int alsa_bit;
	unsigned int rate;
};

static const struct virtsnd_v2a_rate g_v2a_rate_map[] = {
	[VIRTIO_SND_PCM_RATE_5512] = { SNDRV_PCM_RATE_5512, 5512 },
	[VIRTIO_SND_PCM_RATE_8000] = { SNDRV_PCM_RATE_8000, 8000 },
	[VIRTIO_SND_PCM_RATE_11025] = { SNDRV_PCM_RATE_11025, 11025 },
	[VIRTIO_SND_PCM_RATE_16000] = { SNDRV_PCM_RATE_16000, 16000 },
	[VIRTIO_SND_PCM_RATE_22050] = { SNDRV_PCM_RATE_22050, 22050 },
	[VIRTIO_SND_PCM_RATE_32000] = { SNDRV_PCM_RATE_32000, 32000 },
	[VIRTIO_SND_PCM_RATE_44100] = { SNDRV_PCM_RATE_44100, 44100 },
	[VIRTIO_SND_PCM_RATE_48000] = { SNDRV_PCM_RATE_48000, 48000 },
	[VIRTIO_SND_PCM_RATE_64000] = { SNDRV_PCM_RATE_64000, 64000 },
	[VIRTIO_SND_PCM_RATE_88200] = { SNDRV_PCM_RATE_88200, 88200 },
	[VIRTIO_SND_PCM_RATE_96000] = { SNDRV_PCM_RATE_96000, 96000 },
	[VIRTIO_SND_PCM_RATE_176400] = { SNDRV_PCM_RATE_176400, 176400 },
	[VIRTIO_SND_PCM_RATE_192000] = { SNDRV_PCM_RATE_192000, 192000 }
};

/**
 * virtsnd_pcm_build_hw() - Parse substream config and build HW descriptor.
 * @vss: VirtIO substream.
 * @info: VirtIO substream information entry.
 *
 * Context: Any context.
 * Return: 0 on success, -EINVAL if configuration is invalid.
 */
static int virtsnd_pcm_build_hw(struct virtio_pcm_substream *vss,
				struct virtio_snd_pcm_info *info)
{
	struct virtio_device *vdev = vss->snd->vdev;
	unsigned int i;
	u64 values;
	size_t sample_max = 0;
	size_t sample_min = 0;

	vss->features = le32_to_cpu(info->features);

	/*
	 * TODO: set SNDRV_PCM_INFO_{BATCH,BLOCK_TRANSFER} if device supports
	 * only message-based transport.
	 */
	vss->hw.info =
		SNDRV_PCM_INFO_MMAP |
		SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_BATCH |
		SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_INTERLEAVED |
		SNDRV_PCM_INFO_PAUSE;

	if (!info->channels_min || info->channels_min > info->channels_max) {
		dev_err(&vdev->dev,
			"SID %u: invalid channel range [%u %u]\n",
			vss->sid, info->channels_min, info->channels_max);
		return -EINVAL;
	}

	vss->hw.channels_min = info->channels_min;
	vss->hw.channels_max = info->channels_max;

	values = le64_to_cpu(info->formats);

	vss->hw.formats = 0;

	for (i = 0; i < ARRAY_SIZE(g_v2a_format_map); ++i)
		if (values & (1ULL << i)) {
			snd_pcm_format_t alsa_fmt = g_v2a_format_map[i];
			int bytes = snd_pcm_format_physical_width(alsa_fmt) / 8;

			if (!sample_min || sample_min > bytes)
				sample_min = bytes;

			if (sample_max < bytes)
				sample_max = bytes;

			vss->hw.formats |= pcm_format_to_bits(alsa_fmt);
		}

	if (!vss->hw.formats) {
		dev_err(&vdev->dev,
			"SID %u: no supported PCM sample formats found\n",
			vss->sid);
		return -EINVAL;
	}

	values = le64_to_cpu(info->rates);

	vss->hw.rates = 0;

	for (i = 0; i < ARRAY_SIZE(g_v2a_rate_map); ++i)
		if (values & (1ULL << i)) {
			if (!vss->hw.rate_min ||
			    vss->hw.rate_min > g_v2a_rate_map[i].rate)
				vss->hw.rate_min = g_v2a_rate_map[i].rate;

			if (vss->hw.rate_max < g_v2a_rate_map[i].rate)
				vss->hw.rate_max = g_v2a_rate_map[i].rate;

			vss->hw.rates |= g_v2a_rate_map[i].alsa_bit;
		}

	if (!vss->hw.rates) {
		dev_err(&vdev->dev,
			"SID %u: no supported PCM frame rates found\n",
			vss->sid);
		return -EINVAL;
	}

	vss->hw.periods_min = pcm_periods_min;
	vss->hw.periods_max = pcm_periods_max;

	/*
	 * We must ensure that there is enough space in the buffer to store
	 * pcm_buffer_ms ms for the combination (Cmax, Smax, Rmax), where:
	 *   Cmax = maximum supported number of channels,
	 *   Smax = maximum supported sample size in bytes,
	 *   Rmax = maximum supported frame rate.
	 */
	vss->hw.buffer_bytes_max =
		PAGE_ALIGN(sample_max * vss->hw.channels_max * pcm_buffer_ms *
			   (vss->hw.rate_max / MSEC_PER_SEC));

	/*
	 * We must ensure that the minimum period size is enough to store
	 * pcm_period_ms_min ms for the combination (Cmin, Smin, Rmin), where:
	 *   Cmin = minimum supported number of channels,
	 *   Smin = minimum supported sample size in bytes,
	 *   Rmin = minimum supported frame rate.
	 */
	vss->hw.period_bytes_min =
		sample_min * vss->hw.channels_min * pcm_period_ms_min *
		(vss->hw.rate_min / MSEC_PER_SEC);

	/*
	 * We must ensure that the maximum period size is enough to store
	 * pcm_period_ms_max ms for the combination (Cmax, Smax, Rmax).
	 */
	vss->hw.period_bytes_max =
		sample_max * vss->hw.channels_max * pcm_period_ms_max *
		(vss->hw.rate_max / MSEC_PER_SEC);

	return 0;
}

/**
 * virtsnd_pcm_find() - Find the PCM device for the specified node ID.
 * @snd: VirtIO sound device.
 * @nid: Function node ID.
 *
 * Context: Any context.
 * Return: a pointer to the PCM device or ERR_PTR(-ENOENT).
 */
struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid)
{
	struct virtio_pcm *vpcm;

	list_for_each_entry(vpcm, &snd->pcm_list, list)
		if (vpcm->nid == nid)
			return vpcm;

	return ERR_PTR(-ENOENT);
}

/**
 * virtsnd_pcm_find_or_create() - Find or create the PCM device for the
 *                                specified node ID.
 * @snd: VirtIO sound device.
 * @nid: Function node ID.
 *
 * Context: Any context that permits to sleep.
 * Return: a pointer to the PCM device or ERR_PTR(-errno).
 */
struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid)
{
	struct virtio_device *vdev = snd->vdev;
	struct virtio_pcm *vpcm;

	vpcm = virtsnd_pcm_find(snd, nid);
	if (!IS_ERR(vpcm))
		return vpcm;

	vpcm = devm_kzalloc(&vdev->dev, sizeof(*vpcm), GFP_KERNEL);
	if (!vpcm)
		return ERR_PTR(-ENOMEM);

	vpcm->nid = nid;
	list_add_tail(&vpcm->list, &snd->pcm_list);

	return vpcm;
}

/**
 * virtsnd_pcm_validate() - Validate if the device can be started.
 * @vdev: VirtIO parent device.
 *
 * Context: Any context.
 * Return: 0 on success, -EINVAL on failure.
 */
int virtsnd_pcm_validate(struct virtio_device *vdev)
{
	if (pcm_periods_min < 2 || pcm_periods_min > pcm_periods_max) {
		dev_err(&vdev->dev,
			"invalid range [%u %u] of the number of PCM periods\n",
			pcm_periods_min, pcm_periods_max);
		return -EINVAL;
	}

	if (!pcm_period_ms_min || pcm_period_ms_min > pcm_period_ms_max) {
		dev_err(&vdev->dev,
			"invalid range [%u %u] of the size of the PCM period\n",
			pcm_period_ms_min, pcm_period_ms_max);
		return -EINVAL;
	}

	if (pcm_buffer_ms < pcm_periods_min * pcm_period_ms_min) {
		dev_err(&vdev->dev,
			"pcm_buffer_ms(=%u) value cannot be < %u ms\n",
			pcm_buffer_ms, pcm_periods_min * pcm_period_ms_min);
		return -EINVAL;
	}

	if (pcm_period_ms_max > pcm_buffer_ms / 2) {
		dev_err(&vdev->dev,
			"pcm_period_ms_max(=%u) value cannot be > %u ms\n",
			pcm_period_ms_max, pcm_buffer_ms / 2);
		return -EINVAL;
	}

	return 0;
}

/**
 * virtsnd_pcm_period_elapsed() - Kernel work function to handle the elapsed
 *                                period state.
 * @work: Elapsed period work.
 *
 * The main purpose of this function is to call snd_pcm_period_elapsed() in
 * a process context, not in an interrupt context. This is necessary because PCM
 * devices operate in non-atomic mode.
 *
 * Context: Process context.
 */
static void virtsnd_pcm_period_elapsed(struct work_struct *work)
{
	struct virtio_pcm_substream *vss =
		container_of(work, struct virtio_pcm_substream, elapsed_period);

	snd_pcm_period_elapsed(vss->substream);
}

/**
 * virtsnd_pcm_parse_cfg() - Parse the stream configuration.
 * @snd: VirtIO sound device.
 *
 * This function is called during initial device initialization.
 *
 * Context: Any context that permits to sleep.
 * Return: 0 on success, -errno on failure.
 */
int virtsnd_pcm_parse_cfg(struct virtio_snd *snd)
{
	struct virtio_device *vdev = snd->vdev;
	struct virtio_snd_pcm_info *info;
	u32 i;
	int rc;

	virtio_cread_le(vdev, struct virtio_snd_config, streams,
			&snd->nsubstreams);
	if (!snd->nsubstreams)
		return 0;

	snd->substreams = devm_kcalloc(&vdev->dev, snd->nsubstreams,
				       sizeof(*snd->substreams), GFP_KERNEL);
	if (!snd->substreams)
		return -ENOMEM;

	info = kcalloc(snd->nsubstreams, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_PCM_INFO, 0,
				    snd->nsubstreams, sizeof(*info), info);
	if (rc)
		goto on_exit;

	for (i = 0; i < snd->nsubstreams; ++i) {
		struct virtio_pcm_substream *vss = &snd->substreams[i];
		struct virtio_pcm *vpcm;

		vss->snd = snd;
		vss->sid = i;
		INIT_WORK(&vss->elapsed_period, virtsnd_pcm_period_elapsed);

		rc = virtsnd_pcm_build_hw(vss, &info[i]);
		if (rc)
			goto on_exit;

		vss->nid = le32_to_cpu(info[i].hdr.hda_fn_nid);

		vpcm = virtsnd_pcm_find_or_create(snd, vss->nid);
		if (IS_ERR(vpcm)) {
			rc = PTR_ERR(vpcm);
			goto on_exit;
		}

		switch (info[i].direction) {
		case VIRTIO_SND_D_OUTPUT:
			vss->direction = SNDRV_PCM_STREAM_PLAYBACK;
			break;
		case VIRTIO_SND_D_INPUT:
			vss->direction = SNDRV_PCM_STREAM_CAPTURE;
			break;
		default:
			dev_err(&vdev->dev, "SID %u: unknown direction (%u)\n",
				vss->sid, info[i].direction);
			rc = -EINVAL;
			goto on_exit;
		}

		vpcm->streams[vss->direction].nsubstreams++;
	}

on_exit:
	kfree(info);

	return rc;
}

/**
 * virtsnd_pcm_build_devs() - Build ALSA PCM devices.
 * @snd: VirtIO sound device.
 *
 * Context: Any context that permits to sleep.
 * Return: 0 on success, -errno on failure.
 */
int virtsnd_pcm_build_devs(struct virtio_snd *snd)
{
	struct virtio_device *vdev = snd->vdev;
	struct virtio_pcm *vpcm;
	u32 i;
	int rc;

	list_for_each_entry(vpcm, &snd->pcm_list, list) {
		unsigned int npbs =
			vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK].nsubstreams;
		unsigned int ncps =
			vpcm->streams[SNDRV_PCM_STREAM_CAPTURE].nsubstreams;

		if (!npbs && !ncps)
			continue;

		rc = snd_pcm_new(snd->card, VIRTIO_SND_CARD_DRIVER, vpcm->nid,
				 npbs, ncps, &vpcm->pcm);
		if (rc) {
			dev_err(&vdev->dev, "snd_pcm_new[%u] failed: %d\n",
				vpcm->nid, rc);
			return rc;
		}

		vpcm->pcm->info_flags = 0;
		vpcm->pcm->dev_class = SNDRV_PCM_CLASS_GENERIC;
		vpcm->pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
		snprintf(vpcm->pcm->name, sizeof(vpcm->pcm->name),
			 VIRTIO_SND_PCM_NAME " %u", vpcm->pcm->device);
		vpcm->pcm->private_data = vpcm;
		vpcm->pcm->nonatomic = true;

		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
			struct virtio_pcm_stream *stream = &vpcm->streams[i];

			if (!stream->nsubstreams)
				continue;

			stream->substreams =
				devm_kcalloc(&vdev->dev, stream->nsubstreams,
					     sizeof(*stream->substreams),
					     GFP_KERNEL);
			if (!stream->substreams)
				return -ENOMEM;

			stream->nsubstreams = 0;
		}
	}

	for (i = 0; i < snd->nsubstreams; ++i) {
		struct virtio_pcm_stream *vs;
		struct virtio_pcm_substream *vss = &snd->substreams[i];

		vpcm = virtsnd_pcm_find(snd, vss->nid);
		if (IS_ERR(vpcm))
			return PTR_ERR(vpcm);

		vs = &vpcm->streams[vss->direction];
		vs->substreams[vs->nsubstreams++] = vss;
	}

	list_for_each_entry(vpcm, &snd->pcm_list, list) {
		for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
			struct virtio_pcm_stream *vs = &vpcm->streams[i];
			struct snd_pcm_str *ks = &vpcm->pcm->streams[i];
			struct snd_pcm_substream *kss;

			if (!vs->nsubstreams)
				continue;

			for (kss = ks->substream; kss; kss = kss->next)
				vs->substreams[kss->number]->substream = kss;
		}

		snd_pcm_set_managed_buffer_all(vpcm->pcm,
					       SNDRV_DMA_TYPE_VMALLOC, NULL,
					       0, 0);
	}

	return 0;
}