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![Anton Yakovlev](/assets/img/avatar_default.png)
Introduce the operators required for the operation of substreams. Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> Link: https://lore.kernel.org/r/20210302164709.3142702-7-anton.yakovlev@opensynergy.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
513 lines
14 KiB
C
513 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* virtio-snd: Virtio sound device
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* Copyright (C) 2021 OpenSynergy GmbH
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*/
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#include <linux/moduleparam.h>
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#include <linux/virtio_config.h>
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#include "virtio_card.h"
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static u32 pcm_buffer_ms = 160;
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module_param(pcm_buffer_ms, uint, 0644);
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MODULE_PARM_DESC(pcm_buffer_ms, "PCM substream buffer time in milliseconds");
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static u32 pcm_periods_min = 2;
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module_param(pcm_periods_min, uint, 0644);
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MODULE_PARM_DESC(pcm_periods_min, "Minimum number of PCM periods");
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static u32 pcm_periods_max = 16;
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module_param(pcm_periods_max, uint, 0644);
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MODULE_PARM_DESC(pcm_periods_max, "Maximum number of PCM periods");
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static u32 pcm_period_ms_min = 10;
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module_param(pcm_period_ms_min, uint, 0644);
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MODULE_PARM_DESC(pcm_period_ms_min, "Minimum PCM period time in milliseconds");
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static u32 pcm_period_ms_max = 80;
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module_param(pcm_period_ms_max, uint, 0644);
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MODULE_PARM_DESC(pcm_period_ms_max, "Maximum PCM period time in milliseconds");
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/* Map for converting VirtIO format to ALSA format. */
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static const snd_pcm_format_t g_v2a_format_map[] = {
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[VIRTIO_SND_PCM_FMT_IMA_ADPCM] = SNDRV_PCM_FORMAT_IMA_ADPCM,
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[VIRTIO_SND_PCM_FMT_MU_LAW] = SNDRV_PCM_FORMAT_MU_LAW,
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[VIRTIO_SND_PCM_FMT_A_LAW] = SNDRV_PCM_FORMAT_A_LAW,
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[VIRTIO_SND_PCM_FMT_S8] = SNDRV_PCM_FORMAT_S8,
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[VIRTIO_SND_PCM_FMT_U8] = SNDRV_PCM_FORMAT_U8,
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[VIRTIO_SND_PCM_FMT_S16] = SNDRV_PCM_FORMAT_S16_LE,
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[VIRTIO_SND_PCM_FMT_U16] = SNDRV_PCM_FORMAT_U16_LE,
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[VIRTIO_SND_PCM_FMT_S18_3] = SNDRV_PCM_FORMAT_S18_3LE,
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[VIRTIO_SND_PCM_FMT_U18_3] = SNDRV_PCM_FORMAT_U18_3LE,
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[VIRTIO_SND_PCM_FMT_S20_3] = SNDRV_PCM_FORMAT_S20_3LE,
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[VIRTIO_SND_PCM_FMT_U20_3] = SNDRV_PCM_FORMAT_U20_3LE,
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[VIRTIO_SND_PCM_FMT_S24_3] = SNDRV_PCM_FORMAT_S24_3LE,
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[VIRTIO_SND_PCM_FMT_U24_3] = SNDRV_PCM_FORMAT_U24_3LE,
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[VIRTIO_SND_PCM_FMT_S20] = SNDRV_PCM_FORMAT_S20_LE,
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[VIRTIO_SND_PCM_FMT_U20] = SNDRV_PCM_FORMAT_U20_LE,
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[VIRTIO_SND_PCM_FMT_S24] = SNDRV_PCM_FORMAT_S24_LE,
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[VIRTIO_SND_PCM_FMT_U24] = SNDRV_PCM_FORMAT_U24_LE,
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[VIRTIO_SND_PCM_FMT_S32] = SNDRV_PCM_FORMAT_S32_LE,
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[VIRTIO_SND_PCM_FMT_U32] = SNDRV_PCM_FORMAT_U32_LE,
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[VIRTIO_SND_PCM_FMT_FLOAT] = SNDRV_PCM_FORMAT_FLOAT_LE,
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[VIRTIO_SND_PCM_FMT_FLOAT64] = SNDRV_PCM_FORMAT_FLOAT64_LE,
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[VIRTIO_SND_PCM_FMT_DSD_U8] = SNDRV_PCM_FORMAT_DSD_U8,
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[VIRTIO_SND_PCM_FMT_DSD_U16] = SNDRV_PCM_FORMAT_DSD_U16_LE,
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[VIRTIO_SND_PCM_FMT_DSD_U32] = SNDRV_PCM_FORMAT_DSD_U32_LE,
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[VIRTIO_SND_PCM_FMT_IEC958_SUBFRAME] =
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SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE
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};
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/* Map for converting VirtIO frame rate to ALSA frame rate. */
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struct virtsnd_v2a_rate {
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unsigned int alsa_bit;
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unsigned int rate;
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};
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static const struct virtsnd_v2a_rate g_v2a_rate_map[] = {
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[VIRTIO_SND_PCM_RATE_5512] = { SNDRV_PCM_RATE_5512, 5512 },
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[VIRTIO_SND_PCM_RATE_8000] = { SNDRV_PCM_RATE_8000, 8000 },
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[VIRTIO_SND_PCM_RATE_11025] = { SNDRV_PCM_RATE_11025, 11025 },
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[VIRTIO_SND_PCM_RATE_16000] = { SNDRV_PCM_RATE_16000, 16000 },
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[VIRTIO_SND_PCM_RATE_22050] = { SNDRV_PCM_RATE_22050, 22050 },
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[VIRTIO_SND_PCM_RATE_32000] = { SNDRV_PCM_RATE_32000, 32000 },
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[VIRTIO_SND_PCM_RATE_44100] = { SNDRV_PCM_RATE_44100, 44100 },
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[VIRTIO_SND_PCM_RATE_48000] = { SNDRV_PCM_RATE_48000, 48000 },
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[VIRTIO_SND_PCM_RATE_64000] = { SNDRV_PCM_RATE_64000, 64000 },
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[VIRTIO_SND_PCM_RATE_88200] = { SNDRV_PCM_RATE_88200, 88200 },
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[VIRTIO_SND_PCM_RATE_96000] = { SNDRV_PCM_RATE_96000, 96000 },
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[VIRTIO_SND_PCM_RATE_176400] = { SNDRV_PCM_RATE_176400, 176400 },
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[VIRTIO_SND_PCM_RATE_192000] = { SNDRV_PCM_RATE_192000, 192000 }
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};
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/**
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* virtsnd_pcm_build_hw() - Parse substream config and build HW descriptor.
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* @vss: VirtIO substream.
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* @info: VirtIO substream information entry.
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*
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* Context: Any context.
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* Return: 0 on success, -EINVAL if configuration is invalid.
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*/
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static int virtsnd_pcm_build_hw(struct virtio_pcm_substream *vss,
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struct virtio_snd_pcm_info *info)
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{
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struct virtio_device *vdev = vss->snd->vdev;
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unsigned int i;
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u64 values;
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size_t sample_max = 0;
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size_t sample_min = 0;
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vss->features = le32_to_cpu(info->features);
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/*
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* TODO: set SNDRV_PCM_INFO_{BATCH,BLOCK_TRANSFER} if device supports
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* only message-based transport.
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*/
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vss->hw.info =
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_PAUSE;
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if (!info->channels_min || info->channels_min > info->channels_max) {
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dev_err(&vdev->dev,
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"SID %u: invalid channel range [%u %u]\n",
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vss->sid, info->channels_min, info->channels_max);
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return -EINVAL;
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}
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vss->hw.channels_min = info->channels_min;
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vss->hw.channels_max = info->channels_max;
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values = le64_to_cpu(info->formats);
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vss->hw.formats = 0;
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for (i = 0; i < ARRAY_SIZE(g_v2a_format_map); ++i)
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if (values & (1ULL << i)) {
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snd_pcm_format_t alsa_fmt = g_v2a_format_map[i];
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int bytes = snd_pcm_format_physical_width(alsa_fmt) / 8;
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if (!sample_min || sample_min > bytes)
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sample_min = bytes;
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if (sample_max < bytes)
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sample_max = bytes;
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vss->hw.formats |= pcm_format_to_bits(alsa_fmt);
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}
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if (!vss->hw.formats) {
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dev_err(&vdev->dev,
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"SID %u: no supported PCM sample formats found\n",
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vss->sid);
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return -EINVAL;
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}
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values = le64_to_cpu(info->rates);
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vss->hw.rates = 0;
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for (i = 0; i < ARRAY_SIZE(g_v2a_rate_map); ++i)
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if (values & (1ULL << i)) {
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if (!vss->hw.rate_min ||
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vss->hw.rate_min > g_v2a_rate_map[i].rate)
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vss->hw.rate_min = g_v2a_rate_map[i].rate;
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if (vss->hw.rate_max < g_v2a_rate_map[i].rate)
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vss->hw.rate_max = g_v2a_rate_map[i].rate;
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vss->hw.rates |= g_v2a_rate_map[i].alsa_bit;
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}
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if (!vss->hw.rates) {
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dev_err(&vdev->dev,
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"SID %u: no supported PCM frame rates found\n",
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vss->sid);
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return -EINVAL;
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}
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vss->hw.periods_min = pcm_periods_min;
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vss->hw.periods_max = pcm_periods_max;
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/*
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* We must ensure that there is enough space in the buffer to store
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* pcm_buffer_ms ms for the combination (Cmax, Smax, Rmax), where:
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* Cmax = maximum supported number of channels,
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* Smax = maximum supported sample size in bytes,
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* Rmax = maximum supported frame rate.
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*/
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vss->hw.buffer_bytes_max =
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PAGE_ALIGN(sample_max * vss->hw.channels_max * pcm_buffer_ms *
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(vss->hw.rate_max / MSEC_PER_SEC));
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/*
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* We must ensure that the minimum period size is enough to store
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* pcm_period_ms_min ms for the combination (Cmin, Smin, Rmin), where:
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* Cmin = minimum supported number of channels,
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* Smin = minimum supported sample size in bytes,
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* Rmin = minimum supported frame rate.
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*/
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vss->hw.period_bytes_min =
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sample_min * vss->hw.channels_min * pcm_period_ms_min *
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(vss->hw.rate_min / MSEC_PER_SEC);
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/*
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* We must ensure that the maximum period size is enough to store
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* pcm_period_ms_max ms for the combination (Cmax, Smax, Rmax).
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*/
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vss->hw.period_bytes_max =
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sample_max * vss->hw.channels_max * pcm_period_ms_max *
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(vss->hw.rate_max / MSEC_PER_SEC);
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return 0;
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}
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/**
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* virtsnd_pcm_find() - Find the PCM device for the specified node ID.
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* @snd: VirtIO sound device.
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* @nid: Function node ID.
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*
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* Context: Any context.
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* Return: a pointer to the PCM device or ERR_PTR(-ENOENT).
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*/
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struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid)
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{
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struct virtio_pcm *vpcm;
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list_for_each_entry(vpcm, &snd->pcm_list, list)
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if (vpcm->nid == nid)
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return vpcm;
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return ERR_PTR(-ENOENT);
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}
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/**
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* virtsnd_pcm_find_or_create() - Find or create the PCM device for the
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* specified node ID.
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* @snd: VirtIO sound device.
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* @nid: Function node ID.
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*
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* Context: Any context that permits to sleep.
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* Return: a pointer to the PCM device or ERR_PTR(-errno).
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*/
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struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid)
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{
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struct virtio_device *vdev = snd->vdev;
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struct virtio_pcm *vpcm;
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vpcm = virtsnd_pcm_find(snd, nid);
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if (!IS_ERR(vpcm))
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return vpcm;
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vpcm = devm_kzalloc(&vdev->dev, sizeof(*vpcm), GFP_KERNEL);
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if (!vpcm)
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return ERR_PTR(-ENOMEM);
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vpcm->nid = nid;
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list_add_tail(&vpcm->list, &snd->pcm_list);
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return vpcm;
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}
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/**
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* virtsnd_pcm_validate() - Validate if the device can be started.
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* @vdev: VirtIO parent device.
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*
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* Context: Any context.
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* Return: 0 on success, -EINVAL on failure.
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*/
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int virtsnd_pcm_validate(struct virtio_device *vdev)
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{
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if (pcm_periods_min < 2 || pcm_periods_min > pcm_periods_max) {
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dev_err(&vdev->dev,
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"invalid range [%u %u] of the number of PCM periods\n",
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pcm_periods_min, pcm_periods_max);
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return -EINVAL;
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}
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if (!pcm_period_ms_min || pcm_period_ms_min > pcm_period_ms_max) {
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dev_err(&vdev->dev,
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"invalid range [%u %u] of the size of the PCM period\n",
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pcm_period_ms_min, pcm_period_ms_max);
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return -EINVAL;
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}
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if (pcm_buffer_ms < pcm_periods_min * pcm_period_ms_min) {
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dev_err(&vdev->dev,
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"pcm_buffer_ms(=%u) value cannot be < %u ms\n",
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pcm_buffer_ms, pcm_periods_min * pcm_period_ms_min);
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return -EINVAL;
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}
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if (pcm_period_ms_max > pcm_buffer_ms / 2) {
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dev_err(&vdev->dev,
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"pcm_period_ms_max(=%u) value cannot be > %u ms\n",
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pcm_period_ms_max, pcm_buffer_ms / 2);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* virtsnd_pcm_period_elapsed() - Kernel work function to handle the elapsed
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* period state.
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* @work: Elapsed period work.
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*
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* The main purpose of this function is to call snd_pcm_period_elapsed() in
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* a process context, not in an interrupt context. This is necessary because PCM
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* devices operate in non-atomic mode.
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*
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* Context: Process context.
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*/
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static void virtsnd_pcm_period_elapsed(struct work_struct *work)
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{
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struct virtio_pcm_substream *vss =
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container_of(work, struct virtio_pcm_substream, elapsed_period);
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snd_pcm_period_elapsed(vss->substream);
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}
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/**
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* virtsnd_pcm_parse_cfg() - Parse the stream configuration.
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* @snd: VirtIO sound device.
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*
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* This function is called during initial device initialization.
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*
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* Context: Any context that permits to sleep.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_pcm_parse_cfg(struct virtio_snd *snd)
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{
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struct virtio_device *vdev = snd->vdev;
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struct virtio_snd_pcm_info *info;
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u32 i;
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int rc;
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virtio_cread_le(vdev, struct virtio_snd_config, streams,
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&snd->nsubstreams);
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if (!snd->nsubstreams)
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return 0;
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snd->substreams = devm_kcalloc(&vdev->dev, snd->nsubstreams,
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sizeof(*snd->substreams), GFP_KERNEL);
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if (!snd->substreams)
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return -ENOMEM;
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info = kcalloc(snd->nsubstreams, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_PCM_INFO, 0,
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snd->nsubstreams, sizeof(*info), info);
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if (rc)
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goto on_exit;
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for (i = 0; i < snd->nsubstreams; ++i) {
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struct virtio_pcm_substream *vss = &snd->substreams[i];
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struct virtio_pcm *vpcm;
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vss->snd = snd;
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vss->sid = i;
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INIT_WORK(&vss->elapsed_period, virtsnd_pcm_period_elapsed);
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init_waitqueue_head(&vss->msg_empty);
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spin_lock_init(&vss->lock);
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rc = virtsnd_pcm_build_hw(vss, &info[i]);
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if (rc)
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goto on_exit;
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vss->nid = le32_to_cpu(info[i].hdr.hda_fn_nid);
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vpcm = virtsnd_pcm_find_or_create(snd, vss->nid);
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if (IS_ERR(vpcm)) {
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rc = PTR_ERR(vpcm);
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goto on_exit;
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}
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switch (info[i].direction) {
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case VIRTIO_SND_D_OUTPUT:
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vss->direction = SNDRV_PCM_STREAM_PLAYBACK;
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break;
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case VIRTIO_SND_D_INPUT:
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vss->direction = SNDRV_PCM_STREAM_CAPTURE;
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break;
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default:
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dev_err(&vdev->dev, "SID %u: unknown direction (%u)\n",
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vss->sid, info[i].direction);
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rc = -EINVAL;
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goto on_exit;
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}
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vpcm->streams[vss->direction].nsubstreams++;
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}
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on_exit:
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kfree(info);
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return rc;
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}
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/**
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* virtsnd_pcm_build_devs() - Build ALSA PCM devices.
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* @snd: VirtIO sound device.
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*
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* Context: Any context that permits to sleep.
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* Return: 0 on success, -errno on failure.
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*/
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int virtsnd_pcm_build_devs(struct virtio_snd *snd)
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{
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struct virtio_device *vdev = snd->vdev;
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struct virtio_pcm *vpcm;
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u32 i;
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int rc;
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list_for_each_entry(vpcm, &snd->pcm_list, list) {
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unsigned int npbs =
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vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK].nsubstreams;
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unsigned int ncps =
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vpcm->streams[SNDRV_PCM_STREAM_CAPTURE].nsubstreams;
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if (!npbs && !ncps)
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continue;
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rc = snd_pcm_new(snd->card, VIRTIO_SND_CARD_DRIVER, vpcm->nid,
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npbs, ncps, &vpcm->pcm);
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if (rc) {
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dev_err(&vdev->dev, "snd_pcm_new[%u] failed: %d\n",
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vpcm->nid, rc);
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return rc;
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}
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vpcm->pcm->info_flags = 0;
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vpcm->pcm->dev_class = SNDRV_PCM_CLASS_GENERIC;
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vpcm->pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
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snprintf(vpcm->pcm->name, sizeof(vpcm->pcm->name),
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VIRTIO_SND_PCM_NAME " %u", vpcm->pcm->device);
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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_ops(vpcm->pcm, i, &virtsnd_pcm_ops);
|
|
}
|
|
|
|
snd_pcm_set_managed_buffer_all(vpcm->pcm,
|
|
SNDRV_DMA_TYPE_VMALLOC, NULL,
|
|
0, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* virtsnd_pcm_event() - Handle the PCM device event notification.
|
|
* @snd: VirtIO sound device.
|
|
* @event: VirtIO sound event.
|
|
*
|
|
* Context: Interrupt context.
|
|
*/
|
|
void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event)
|
|
{
|
|
struct virtio_pcm_substream *vss;
|
|
u32 sid = le32_to_cpu(event->data);
|
|
|
|
if (sid >= snd->nsubstreams)
|
|
return;
|
|
|
|
vss = &snd->substreams[sid];
|
|
|
|
switch (le32_to_cpu(event->hdr.code)) {
|
|
case VIRTIO_SND_EVT_PCM_PERIOD_ELAPSED:
|
|
/* TODO: deal with shmem elapsed period */
|
|
break;
|
|
case VIRTIO_SND_EVT_PCM_XRUN:
|
|
spin_lock(&vss->lock);
|
|
if (vss->xfer_enabled)
|
|
vss->xfer_xrun = true;
|
|
spin_unlock(&vss->lock);
|
|
break;
|
|
}
|
|
}
|