diff options
Diffstat (limited to 'meta-agl-bsp/virtualization-layer/recipes-kernel/linux/linux-yocto/virtio-kmeta/bsp/virtio/virtio-snd/0004-ALSA-virtio-build-PCM-devices-and-substream-hardware.patch')
| -rw-r--r-- | meta-agl-bsp/virtualization-layer/recipes-kernel/linux/linux-yocto/virtio-kmeta/bsp/virtio/virtio-snd/0004-ALSA-virtio-build-PCM-devices-and-substream-hardware.patch | 703 |
1 files changed, 703 insertions, 0 deletions
diff --git a/meta-agl-bsp/virtualization-layer/recipes-kernel/linux/linux-yocto/virtio-kmeta/bsp/virtio/virtio-snd/0004-ALSA-virtio-build-PCM-devices-and-substream-hardware.patch b/meta-agl-bsp/virtualization-layer/recipes-kernel/linux/linux-yocto/virtio-kmeta/bsp/virtio/virtio-snd/0004-ALSA-virtio-build-PCM-devices-and-substream-hardware.patch new file mode 100644 index 000000000..27ae9a865 --- /dev/null +++ b/meta-agl-bsp/virtualization-layer/recipes-kernel/linux/linux-yocto/virtio-kmeta/bsp/virtio/virtio-snd/0004-ALSA-virtio-build-PCM-devices-and-substream-hardware.patch @@ -0,0 +1,703 @@ +From 12e4e501f9662a02e61acb5966fdceeffb0ff16d Mon Sep 17 00:00:00 2001 +From: Anton Yakovlev <anton.yakovlev@opensynergy.com> +Date: Tue, 2 Mar 2021 17:47:04 +0100 +Subject: [PATCH] ALSA: virtio: build PCM devices and substream hardware + descriptors + +Like the HDA specification, the virtio sound device specification links +PCM substreams, jacks and PCM channel maps into functional groups. For +each discovered group, a PCM device is created, the number of which +coincides with the group number. + +Introduce the module parameters for setting the hardware buffer +parameters: + pcm_buffer_ms [=160] + pcm_periods_min [=2] + pcm_periods_max [=16] + pcm_period_ms_min [=10] + pcm_period_ms_max [=80] + +Signed-off-by: Anton Yakovlev <anton.yakovlev@opensynergy.com> +Link: https://lore.kernel.org/r/20210302164709.3142702-5-anton.yakovlev@opensynergy.com +Signed-off-by: Takashi Iwai <tiwai@suse.de> +Signed-off-by: Vasyl Vavrychuk <vasyl.vavrychuk@opensynergy.com> +--- + sound/virtio/Makefile | 3 +- + sound/virtio/virtio_card.c | 18 ++ + sound/virtio/virtio_card.h | 10 + + sound/virtio/virtio_pcm.c | 479 +++++++++++++++++++++++++++++++++++++ + sound/virtio/virtio_pcm.h | 72 ++++++ + 5 files changed, 581 insertions(+), 1 deletion(-) + create mode 100644 sound/virtio/virtio_pcm.c + create mode 100644 sound/virtio/virtio_pcm.h + +diff --git a/sound/virtio/Makefile b/sound/virtio/Makefile +index dc551e637441..69162a545a41 100644 +--- a/sound/virtio/Makefile ++++ b/sound/virtio/Makefile +@@ -4,5 +4,6 @@ obj-$(CONFIG_SND_VIRTIO) += virtio_snd.o + + virtio_snd-objs := \ + virtio_card.o \ +- virtio_ctl_msg.o ++ virtio_ctl_msg.o \ ++ virtio_pcm.o + +diff --git a/sound/virtio/virtio_card.c b/sound/virtio/virtio_card.c +index b757b2444078..11c76ee311b7 100644 +--- a/sound/virtio/virtio_card.c ++++ b/sound/virtio/virtio_card.c +@@ -209,6 +209,16 @@ static int virtsnd_build_devs(struct virtio_snd *snd) + VIRTIO_SND_CARD_NAME " at %s/%s", + dev_name(dev->parent), dev_name(dev)); + ++ rc = virtsnd_pcm_parse_cfg(snd); ++ if (rc) ++ return rc; ++ ++ if (snd->nsubstreams) { ++ rc = virtsnd_pcm_build_devs(snd); ++ if (rc) ++ return rc; ++ } ++ + return snd_card_register(snd->card); + } + +@@ -237,6 +247,9 @@ static int virtsnd_validate(struct virtio_device *vdev) + return -EINVAL; + } + ++ if (virtsnd_pcm_validate(vdev)) ++ return -EINVAL; ++ + return 0; + } + +@@ -259,6 +272,7 @@ static int virtsnd_probe(struct virtio_device *vdev) + + snd->vdev = vdev; + INIT_LIST_HEAD(&snd->ctl_msgs); ++ INIT_LIST_HEAD(&snd->pcm_list); + + vdev->priv = snd; + +@@ -293,6 +307,7 @@ static int virtsnd_probe(struct virtio_device *vdev) + static void virtsnd_remove(struct virtio_device *vdev) + { + struct virtio_snd *snd = vdev->priv; ++ unsigned int i; + + virtsnd_disable_event_vq(snd); + virtsnd_ctl_msg_cancel_all(snd); +@@ -303,6 +318,9 @@ static void virtsnd_remove(struct virtio_device *vdev) + vdev->config->del_vqs(vdev); + vdev->config->reset(vdev); + ++ for (i = 0; snd->substreams && i < snd->nsubstreams; ++i) ++ cancel_work_sync(&snd->substreams[i].elapsed_period); ++ + kfree(snd->event_msgs); + } + +diff --git a/sound/virtio/virtio_card.h b/sound/virtio/virtio_card.h +index 1e76eeff160f..77a1b7255370 100644 +--- a/sound/virtio/virtio_card.h ++++ b/sound/virtio/virtio_card.h +@@ -12,9 +12,13 @@ + #include <uapi/linux/virtio_snd.h> + + #include "virtio_ctl_msg.h" ++#include "virtio_pcm.h" + + #define VIRTIO_SND_CARD_DRIVER "virtio-snd" + #define VIRTIO_SND_CARD_NAME "VirtIO SoundCard" ++#define VIRTIO_SND_PCM_NAME "VirtIO PCM" ++ ++struct virtio_pcm_substream; + + /** + * struct virtio_snd_queue - Virtqueue wrapper structure. +@@ -33,6 +37,9 @@ struct virtio_snd_queue { + * @card: ALSA sound card. + * @ctl_msgs: Pending control request list. + * @event_msgs: Device events. ++ * @pcm_list: VirtIO PCM device list. ++ * @substreams: VirtIO PCM substreams. ++ * @nsubstreams: Number of PCM substreams. + */ + struct virtio_snd { + struct virtio_device *vdev; +@@ -40,6 +47,9 @@ struct virtio_snd { + struct snd_card *card; + struct list_head ctl_msgs; + struct virtio_snd_event *event_msgs; ++ struct list_head pcm_list; ++ struct virtio_pcm_substream *substreams; ++ u32 nsubstreams; + }; + + /* Message completion timeout in milliseconds (module parameter). */ +diff --git a/sound/virtio/virtio_pcm.c b/sound/virtio/virtio_pcm.c +new file mode 100644 +index 000000000000..e16567e2e214 +--- /dev/null ++++ b/sound/virtio/virtio_pcm.c +@@ -0,0 +1,479 @@ ++// 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; ++} +diff --git a/sound/virtio/virtio_pcm.h b/sound/virtio/virtio_pcm.h +new file mode 100644 +index 000000000000..84f2f3f14f48 +--- /dev/null ++++ b/sound/virtio/virtio_pcm.h +@@ -0,0 +1,72 @@ ++/* SPDX-License-Identifier: GPL-2.0+ */ ++/* ++ * virtio-snd: Virtio sound device ++ * Copyright (C) 2021 OpenSynergy GmbH ++ */ ++#ifndef VIRTIO_SND_PCM_H ++#define VIRTIO_SND_PCM_H ++ ++#include <linux/atomic.h> ++#include <linux/virtio_config.h> ++#include <sound/pcm.h> ++ ++struct virtio_pcm; ++struct virtio_pcm_msg; ++ ++/** ++ * struct virtio_pcm_substream - VirtIO PCM substream. ++ * @snd: VirtIO sound device. ++ * @nid: Function group node identifier. ++ * @sid: Stream identifier. ++ * @direction: Stream data flow direction (SNDRV_PCM_STREAM_XXX). ++ * @features: Stream VirtIO feature bit map (1 << VIRTIO_SND_PCM_F_XXX). ++ * @substream: Kernel ALSA substream. ++ * @hw: Kernel ALSA substream hardware descriptor. ++ * @elapsed_period: Kernel work to handle the elapsed period state. ++ */ ++struct virtio_pcm_substream { ++ struct virtio_snd *snd; ++ u32 nid; ++ u32 sid; ++ u32 direction; ++ u32 features; ++ struct snd_pcm_substream *substream; ++ struct snd_pcm_hardware hw; ++ struct work_struct elapsed_period; ++}; ++ ++/** ++ * struct virtio_pcm_stream - VirtIO PCM stream. ++ * @substreams: VirtIO substreams belonging to the stream. ++ * @nsubstreams: Number of substreams. ++ */ ++struct virtio_pcm_stream { ++ struct virtio_pcm_substream **substreams; ++ u32 nsubstreams; ++}; ++ ++/** ++ * struct virtio_pcm - VirtIO PCM device. ++ * @list: VirtIO PCM list entry. ++ * @nid: Function group node identifier. ++ * @pcm: Kernel PCM device. ++ * @streams: VirtIO PCM streams (playback and capture). ++ */ ++struct virtio_pcm { ++ struct list_head list; ++ u32 nid; ++ struct snd_pcm *pcm; ++ struct virtio_pcm_stream streams[SNDRV_PCM_STREAM_LAST + 1]; ++}; ++ ++int virtsnd_pcm_validate(struct virtio_device *vdev); ++ ++int virtsnd_pcm_parse_cfg(struct virtio_snd *snd); ++ ++int virtsnd_pcm_build_devs(struct virtio_snd *snd); ++ ++struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid); ++ ++struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid); ++ ++#endif /* VIRTIO_SND_PCM_H */ |