[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v2 1/3] Add virtio-sound device
|
From: |
Alex Bennée |
|
Subject: |
Re: [PATCH v2 1/3] Add virtio-sound device |
|
Date: |
Mon, 17 Jul 2023 16:38:29 +0100 |
|
User-agent: |
mu4e 1.11.9; emacs 29.0.92 |
Manos Pitsidianakis <manos.pitsidianakis@linaro.org> writes:
> This patch adds an audio device implementing the recent virtio sound
> spec (1.2).
>
> PCM functionality is implemented, and jack[0], chmaps[1] messages are
> at the moment left unimplemented.
>
> PS2: This patch was based on a draft patch posted by OpenSynergy in 2019. [2]
>
> [0]: https://www.kernel.org/doc/html/latest/sound/designs/jack-controls.html
> [1]:
> https://www.kernel.org/doc/html/latest/sound/designs/channel-mapping-api.html
> [2]:
> https://github.com/OpenSynergy/qemu/commit/5a2f350eec5d157b90d9c7b40a8e603f4da92471#diff-fa5c10be8476fb5385a280885d527b0b40dfc11ddcc74369fce085d8b5b17bbd
>
> Signed-off-by: Emmanouil Pitsidianakis <manos.pitsidianakis@linaro.org>
> Signed-off-by: Igor Skalkin <Igor.Skalkin@opensynergy.com>
> Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com>
> ---
> MAINTAINERS | 6 +
> hw/virtio/Kconfig | 5 +
> hw/virtio/meson.build | 1 +
> hw/virtio/trace-events | 21 +
> hw/virtio/virtio-snd.c | 1121 ++++++++++++++++++++++++++++++++
> include/hw/virtio/virtio-snd.h | 194 ++++++
> 6 files changed, 1348 insertions(+)
> create mode 100644 hw/virtio/virtio-snd.c
> create mode 100644 include/hw/virtio/virtio-snd.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1c93ab0ee5..5d5475b1c1 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2218,6 +2218,12 @@ F: hw/virtio/virtio-mem-pci.h
> F: hw/virtio/virtio-mem-pci.c
> F: include/hw/virtio/virtio-mem.h
>
> +virtio-snd
> +M: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
> +S: Supported
> +F: hw/virtio/virtio-snd*.c
> +F: include/hw/virtio/virtio-snd.h
> +
> nvme
> M: Keith Busch <kbusch@kernel.org>
> M: Klaus Jensen <its@irrelevant.dk>
> diff --git a/hw/virtio/Kconfig b/hw/virtio/Kconfig
> index 89e9e426d8..fcc522ed21 100644
> --- a/hw/virtio/Kconfig
> +++ b/hw/virtio/Kconfig
> @@ -17,6 +17,11 @@ config VIRTIO_PCI
> depends on PCI
> select VIRTIO
>
> +config VIRTIO_SND
> + bool
> + default y
> + depends on VIRTIO
> +
> config VIRTIO_MMIO
> bool
> select VIRTIO
> diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build
> index bdec78bfc6..8cf49af618 100644
> --- a/hw/virtio/meson.build
> +++ b/hw/virtio/meson.build
> @@ -68,5 +68,6 @@ softmmu_ss.add(when: 'CONFIG_VIRTIO', if_false:
> files('virtio-stub.c'))
> softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('vhost-stub.c'))
> softmmu_ss.add(when: 'CONFIG_ALL', if_true: files('virtio-stub.c'))
> softmmu_ss.add(files('virtio-hmp-cmds.c'))
> +softmmu_ss.add(when: 'CONFIG_VIRTIO_SND', if_true:
> files('virtio-snd.c'))
I suspect this wants to be above with the other specific_virtio_ss devices,
currently:
specific_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_GPIO'],
if_true: files('vhost-user-gpio-pci.c'))
specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_SCMI', if_true:
files('vhost-user-scmi.c'))
specific_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI','CONFIG_VHOST_USER_SCMI'],
if_true: files('vhost-user-sc
Although I suspect the vhost-user-scmi-pci and vhost-user-gpio-pci need
to be shuffled down into the virtio_pci_ss source set bellow (as
separate patches, and maybe start sorting them?)
>
> specific_ss.add_all(when: 'CONFIG_VIRTIO', if_true: specific_virtio_ss)
> diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
> index 8f8d05cf9b..b77d78abdc 100644
> --- a/hw/virtio/trace-events
> +++ b/hw/virtio/trace-events
> @@ -151,3 +151,24 @@ virtio_pmem_flush_done(int type) "fsync return=%d"
> virtio_gpio_start(void) "start"
> virtio_gpio_stop(void) "stop"
> virtio_gpio_set_status(uint8_t status) "0x%x"
> +
> +#virtio-snd.c
> +virtio_snd_pcm_stream_flush(int stream) "flushing stream %d"
> +virtio_snd_handle_ctrl(void *vdev, void *vq) "snd %p: handle ctrl event for
> queue %p"
> +#virtio_snd_handle_jack_info(int jack) "VIRTIO_SND_JACK_INFO called for jack
> %d"
> +#virtio_snd_handle_jack_remap(void) "VIRTIO_SND_PCM_JACK_REMAP called"
> +virtio_snd_handle_pcm_info(int stream) "VIRTIO_SND_R_PCM_INFO called for
> stream %d"
> +virtio_snd_handle_pcm_set_params(int stream) "VIRTIO_SND_PCM_SET_PARAMS
> called for stream %d"
> +virtio_snd_handle_pcm_start_stop(const char *code, int stream) "%s called
> for stream %d"
> +virtio_snd_handle_pcm_release(int stream) "VIRTIO_SND_PCM_RELEASE called for
> stream %d"
> +virtio_snd_handle_chmap_info(void) "VIRTIO_SND_CHMAP_INFO called"
> +virtio_snd_handle_xfer(void) "tx/rx queue callback called"
> +virtio_snd_handle_event(void) "event queue callback called"
> +virtio_snd_realize(void *snd) "snd %p: realize"
> +virtio_snd_unrealize(void *snd) "snd %p: unrealize"
> +virtio_snd_get_features(void *vdev, uint64_t features) "snd %p: get_features
> 0x%"PRIx64
> +virtio_snd_get_config(void *vdev, uint32_t jacks, uint32_t streams, uint32_t
> chmaps) "snd %p: get_config jacks=%d streams=%d chmaps=%d"
> +virtio_snd_set_config(void *vdev, uint32_t jacks, uint32_t new_jacks,
> uint32_t streams, uint32_t new_streams, uint32_t chmaps, uint32_t new_chmaps)
> "snd %p: set_config jacks from %d->%d, streams from %d->%d, chmaps from
> %d->%d"
> +virtio_snd_vm_state_running(void) "vm state running"
> +virtio_snd_vm_state_stopped(void) "vm state stopped"
> +virtio_snd_handle_code(int val, const char *code) "ctrl code msg val = %d ==
> %s"
> diff --git a/hw/virtio/virtio-snd.c b/hw/virtio/virtio-snd.c
> new file mode 100644
> index 0000000000..e3b6c353ad
> --- /dev/null
> +++ b/hw/virtio/virtio-snd.c
> @@ -0,0 +1,1121 @@
> +/*
> + * VIRTIO Sound Device conforming to
> + *
> + * "Virtual I/O Device (VIRTIO) Version 1.2
> + * Committee Specification Draft 01
> + * 09 May 2022"
The canonical URL wouldn't go amiss here:
https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-52900014
> + *
> + * Copyright (c) 2023 Emmanouil Pitsidianakis
> <manos.pitsidianakis@linaro.org>
> + * Copyright (C) 2019 OpenSynergy GmbH
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or
> + * (at your option) any later version. See the COPYING file in the
> + * top-level directory.
> + */
> +
<snip>
> +
> +/*
> + * Set the given stream params.
> + * Called by both virtio_snd_handle_pcm_set_params and during device
> + * initialization.
> + * Returns the response status code. (VIRTIO_SND_S_*).
> + *
> + * @s: VirtIOSound device
> + * @params: The PCM params as defined in the virtio specification
> + */
> +static
> +uint32_t virtio_snd_pcm_set_params_impl(VirtIOSound *s,
> + virtio_snd_pcm_set_params *params)
> +{
> + uint32_t supported_formats, supported_rates;
> + VirtIOSoundPCMParams *st_params;
> + uint32_t stream_id = params->hdr.stream_id;
> +
> + if (stream_id > s->snd_conf.streams || !(s->pcm->pcm_params)) {
> + virtio_error(VIRTIO_DEVICE(s), "Streams have not been
> initialized.\n");
> + return VIRTIO_SND_S_BAD_MSG;
> + }
> +
> + if (!s->pcm->pcm_params[stream_id]) {
> + s->pcm->pcm_params[stream_id] = g_new0(VirtIOSoundPCMParams, 1);
> + }
> + st_params = virtio_snd_pcm_get_params(s, stream_id);
> +
> + st_params->features = params->features;
> + st_params->buffer_bytes = params->buffer_bytes;
> + st_params->period_bytes = params->period_bytes;
> +
> + if (params->channels < 1 || params->channels > AUDIO_MAX_CHANNELS) {
> + error_report("Number of channels is not supported.");
> + return VIRTIO_SND_S_NOT_SUPP;
> + }
> + st_params->channels = params->channels;
> +
> + supported_formats = 1 << VIRTIO_SND_PCM_FMT_S8
> + | 1 << VIRTIO_SND_PCM_FMT_U8
> + | 1 << VIRTIO_SND_PCM_FMT_S16
> + | 1 << VIRTIO_SND_PCM_FMT_U16
> + | 1 << VIRTIO_SND_PCM_FMT_S32
> + | 1 << VIRTIO_SND_PCM_FMT_U32
> + | 1 << VIRTIO_SND_PCM_FMT_FLOAT;
> +
> + supported_rates = 1 << VIRTIO_SND_PCM_RATE_5512
> + | 1 << VIRTIO_SND_PCM_RATE_8000
> + | 1 << VIRTIO_SND_PCM_RATE_11025
> + | 1 << VIRTIO_SND_PCM_RATE_16000
> + | 1 << VIRTIO_SND_PCM_RATE_22050
> + | 1 << VIRTIO_SND_PCM_RATE_32000
> + | 1 << VIRTIO_SND_PCM_RATE_44100
> + | 1 << VIRTIO_SND_PCM_RATE_48000
> + | 1 << VIRTIO_SND_PCM_RATE_64000
> + | 1 << VIRTIO_SND_PCM_RATE_88200
> + | 1 << VIRTIO_SND_PCM_RATE_96000
> + | 1 << VIRTIO_SND_PCM_RATE_176400
> + | 1 << VIRTIO_SND_PCM_RATE_192000
> + | 1 << VIRTIO_SND_PCM_RATE_384000;
There seems to be a lot of duplication of constants with
virtio_snd_pcm_prepare_impl bellow. Is this stuff that depends on the
backend? Is it fixed or dynamic depending on the machine?
> +
> + if (!(supported_formats & (1 << params->format))) {
> + error_report("Stream format is not supported.");
> + return VIRTIO_SND_S_NOT_SUPP;
> + }
> + st_params->format = params->format;
> +
> + if (!(supported_rates & (1 << params->rate))) {
> + error_report("Stream rate is not supported.");
> + return VIRTIO_SND_S_NOT_SUPP;
> + }
> + st_params->rate = params->rate;
> + st_params->period_bytes = params->period_bytes;
> + st_params->buffer_bytes = params->buffer_bytes;
> +
> + return VIRTIO_SND_S_OK;
> +}
> +
> +/*
> + * Handles the VIRTIO_SND_R_PCM_SET_PARAMS request.
> + *
> + * @s: VirtIOSound device
> + * @cmd: The request command queue element from VirtIOSound cmdq field
> + */
> +static void virtio_snd_handle_pcm_set_params(VirtIOSound *s,
> + virtio_snd_ctrl_command *cmd)
> +{
> + virtio_snd_pcm_set_params req;
> + uint32_t sz;
> +
> + sz = iov_to_buf(cmd->elem->out_sg,
> + cmd->elem->out_num,
> + 0,
> + &req,
> + sizeof(req));
> + assert(sz == sizeof(virtio_snd_pcm_set_params));
> +
> + trace_virtio_snd_handle_pcm_set_params(req.hdr.stream_id);
> + cmd->resp.code = virtio_snd_pcm_set_params_impl(s, &req);
> +
> + return;
> +}
> +
> +/*
> + * Get a QEMU Audiosystem compatible format value from a VIRTIO_SND_PCM_FMT_*
> + */
> +static AudioFormat virtio_snd_get_qemu_format(uint32_t format)
> +{
> + switch (format) {
> + case VIRTIO_SND_PCM_FMT_U8:
> + return AUDIO_FORMAT_U8;
Dare I suggest macros?
#define CASE(FMT) \
case VIRTIO_SND_PCM_FMT__##FMT: \
return AUDIO_FORMAT_##FMT
case(S8);
case(U16);
...
default:
return -1;
#undef CASE
I know it's not quite as hygienic as rust but this is C ;-)
> + case VIRTIO_SND_PCM_FMT_S8:
> + return AUDIO_FORMAT_S8;
> + case VIRTIO_SND_PCM_FMT_U16:
> + return AUDIO_FORMAT_U16;
> + case VIRTIO_SND_PCM_FMT_S16:
> + return AUDIO_FORMAT_S16;
> + case VIRTIO_SND_PCM_FMT_U32:
> + return AUDIO_FORMAT_U32;
> + case VIRTIO_SND_PCM_FMT_S32:
> + return AUDIO_FORMAT_S32;
> + case VIRTIO_SND_PCM_FMT_FLOAT:
> + return AUDIO_FORMAT_F32;
> + default:
> + return -1;
> + }
> +}
> +
> +/*
> + * Get a QEMU Audiosystem compatible frequency value from a
> + * VIRTIO_SND_PCM_RATE_*
> + */
> +static uint32_t virtio_snd_get_qemu_freq(uint32_t rate)
> +{
> + switch (rate) {
> + case VIRTIO_SND_PCM_RATE_5512:
> + return 5512;
Same?
> + case VIRTIO_SND_PCM_RATE_8000:
> + return 8000;
> + case VIRTIO_SND_PCM_RATE_11025:
> + return 11025;
> + case VIRTIO_SND_PCM_RATE_16000:
> + return 16000;
> + case VIRTIO_SND_PCM_RATE_22050:
> + return 22050;
> + case VIRTIO_SND_PCM_RATE_32000:
> + return 32000;
> + case VIRTIO_SND_PCM_RATE_44100:
> + return 44100;
> + case VIRTIO_SND_PCM_RATE_48000:
> + return 48000;
> + case VIRTIO_SND_PCM_RATE_64000:
> + return 64000;
> + case VIRTIO_SND_PCM_RATE_88200:
> + return 88200;
> + case VIRTIO_SND_PCM_RATE_96000:
> + return 96000;
> + case VIRTIO_SND_PCM_RATE_176400:
> + return 176400;
> + case VIRTIO_SND_PCM_RATE_192000:
> + return 192000;
> + case VIRTIO_SND_PCM_RATE_384000:
> + return 384000;
> + default:
> + return -1;
> + }
> +}
> +
> +/*
> + * Get QEMU Audiosystem compatible audsettings from virtio based pcm stream
> + * params.
> + */
> +static void virtio_snd_get_qemu_audsettings(audsettings *as,
> + VirtIOSoundPCMParams *params)
> +{
> + as->nchannels = MIN(AUDIO_MAX_CHANNELS, params->channels);
> + as->fmt = virtio_snd_get_qemu_format(params->format);
> + as->freq = virtio_snd_get_qemu_freq(params->rate);
> + as->endianness = AUDIO_HOST_ENDIANNESS;
> +}
> +
> +/*
> + * Prepares a VirtIOSound card stream.
> + * Returns the response status code. (VIRTIO_SND_S_*).
> + *
> + * @s: VirtIOSound device
> + * @stream_id: stream id
> + */
> +static uint32_t virtio_snd_pcm_prepare_impl(VirtIOSound *s, uint32_t
> stream_id)
> +{
> + audsettings as;
> + uint32_t supported_formats, supported_rates;
> + VirtIOSoundPCMParams *params;
> + VirtIOSoundPCMStream *stream;
> +
> + if (!s->pcm->streams
> + || !s->pcm->pcm_params
> + || !s->pcm->pcm_params[stream_id]) {
> + return VIRTIO_SND_S_BAD_MSG;
> + }
> +
> + supported_formats = 1 << VIRTIO_SND_PCM_FMT_S8
> + | 1 << VIRTIO_SND_PCM_FMT_U8
> + | 1 << VIRTIO_SND_PCM_FMT_S16
> + | 1 << VIRTIO_SND_PCM_FMT_U16
> + | 1 << VIRTIO_SND_PCM_FMT_S32
> + | 1 << VIRTIO_SND_PCM_FMT_U32
> + | 1 << VIRTIO_SND_PCM_FMT_FLOAT;
> +
> + supported_rates = 1 << VIRTIO_SND_PCM_RATE_5512
> + | 1 << VIRTIO_SND_PCM_RATE_8000
> + | 1 << VIRTIO_SND_PCM_RATE_11025
> + | 1 << VIRTIO_SND_PCM_RATE_16000
> + | 1 << VIRTIO_SND_PCM_RATE_22050
> + | 1 << VIRTIO_SND_PCM_RATE_32000
> + | 1 << VIRTIO_SND_PCM_RATE_44100
> + | 1 << VIRTIO_SND_PCM_RATE_48000
> + | 1 << VIRTIO_SND_PCM_RATE_64000
> + | 1 << VIRTIO_SND_PCM_RATE_88200
> + | 1 << VIRTIO_SND_PCM_RATE_96000
> + | 1 << VIRTIO_SND_PCM_RATE_176400
> + | 1 << VIRTIO_SND_PCM_RATE_192000
> + | 1 << VIRTIO_SND_PCM_RATE_384000;
> +
> + params = virtio_snd_pcm_get_params(s, stream_id);
> + assert(params);
asserting for something you expect to happen is bad form. If it
shouldn't happen maybe the assert should be lower (i.e. in
virtio_snd_pcm_get_params itself)?
> +
> + virtio_snd_get_qemu_audsettings(&as, params);
> +
> + stream = g_new0(VirtIOSoundPCMStream, 1);
> +
> + stream->id = stream_id;
> + stream->pcm = s->pcm;
> + stream->direction = stream_id < s->snd_conf.streams / 2 +
> + (s->snd_conf.streams & 1) ? VIRTIO_SND_D_OUTPUT : VIRTIO_SND_D_INPUT;
> + stream->info.hdr.hda_fn_nid = VIRTIO_SOUND_HDA_FN_NID;
> + stream->features = 0;
> + stream->channels_min = 1;
> + stream->channels_max = as.nchannels;
> + stream->formats = supported_formats;
> + stream->rates = supported_rates;
> + stream->s = s;
> +
> + stream->buffer_bytes = params->buffer_bytes;
> + stream->period_bytes = params->period_bytes;
> +
> + stream->positions[0] = VIRTIO_SND_CHMAP_FL;
> + stream->positions[1] = VIRTIO_SND_CHMAP_FR;
> +
> +
> + if (stream->direction == VIRTIO_SND_D_OUTPUT) {
> + stream->voice.out = AUD_open_out(&s->card,
> + stream->voice.out,
> + "virtio_snd_card",
> + stream,
> + virtio_snd_pcm_out_cb,
> + &as);
> +
> + } else {
> + qemu_log_mask(LOG_UNIMP, "virtio_snd: input/capture is
> unimplemented.");
> + /*
> + * stream->voice.in = AUD_open_in(&s->card,
> + * stream->voice.in,
> + * "virtio_snd_card",
> + * stream,
> + * virtio_snd_input_cb,
> + * &as);
> + */
> + }
> +
> + stream->as = as;
> + stream->desired_as = stream->as;
> + qemu_mutex_init(&stream->queue_mutex);
> + QSIMPLEQ_INIT(&stream->queue);
> +
> + s->pcm->streams[stream_id] = stream;
> +
> + return VIRTIO_SND_S_OK;
> +}
> +
> +/*
> + * Handles VIRTIO_SND_R_PCM_PREPARE.
> + *
> + * @s: VirtIOSound device
> + * @cmd: The request command queue element from VirtIOSound cmdq field
> + */
> +static void virtio_snd_handle_pcm_prepare(VirtIOSound *s,
> + virtio_snd_ctrl_command *cmd)
> +{
> + uint32_t stream_id;
> + size_t sz;
> +
> + sz = iov_to_buf(cmd->elem->out_sg, cmd->elem->out_num,
> + sizeof(virtio_snd_hdr), &stream_id, sizeof(stream_id));
> + assert(sz == sizeof(uint32_t));
> +
> + cmd->resp.code = virtio_snd_pcm_prepare_impl(s, stream_id);
> + return;
> +}
> +
> +/*
> + * Handles VIRTIO_SND_R_PCM_START.
> + *
> + * @s: VirtIOSound device
> + * @cmd: The request command queue element from VirtIOSound cmdq field
> + * @start: whether to start or stop the device
> + */
> +static void virtio_snd_handle_pcm_start_stop(VirtIOSound *s,
> + virtio_snd_ctrl_command *cmd,
> + bool start)
> +{
> + VirtIOSoundPCMStream *stream;
> + virtio_snd_pcm_hdr req;
> + size_t sz;
> +
> + sz = iov_to_buf(cmd->elem->out_sg,
> + cmd->elem->out_num,
> + 0,
> + &req,
> + sizeof(req));
> + assert(sz == sizeof(virtio_snd_pcm_hdr));
asserting on guest data is also a no no.
> +
> + cmd->resp.code = VIRTIO_SND_S_OK;
> + trace_virtio_snd_handle_pcm_start_stop(start ? "VIRTIO_SND_R_PCM_START" :
> + "VIRTIO_SND_R_PCM_STOP", req.stream_id);
> +
> + stream = virtio_snd_pcm_get_stream(s, req.stream_id);
> +
> + if (stream) {
> + if (stream->direction == VIRTIO_SND_D_OUTPUT) {
> + AUD_set_active_out(stream->voice.out, start);
> + }
> + } else {
> + cmd->resp.code = VIRTIO_SND_S_BAD_MSG;
> + }
> + return;
> +}
> +
> +/*
> + * Returns the number of bytes that have not been passed to AUD_write yet.
> + *
> + * @stream: VirtIOSoundPCMStream
> + */
> +static int virtio_snd_pcm_get_pending_bytes(VirtIOSoundPCMStream *stream)
> +{
> + VirtIOSoundPCMBlock *block;
> + VirtIOSoundPCMBlock *next;
> + int size = 0;
> +
> + WITH_QEMU_LOCK_GUARD(&stream->queue_mutex) {
> + QSIMPLEQ_FOREACH_SAFE(block, &stream->queue, entry, next) {
> + size += block->size;
> + }
> + }
> + return size;
> +}
> +
> +/*
> + * Releases the buffer resources allocated to a stream. Seperated from the
> + * handler so that the code can be reused in the unrealize function. Returns
> + * the response status code. (VIRTIO_SND_S_*).
> + *
> + * @stream: VirtIOSoundPCMStream stream
> + * @stream_id: stream id
> + */
> +static uint32_t virtio_snd_pcm_release_impl(VirtIOSoundPCMStream *stream,
> + uint32_t stream_id)
> +{
> + assert(stream->s->pcm->streams[stream_id] == stream);
> +
> + if (virtio_snd_pcm_get_pending_bytes(stream)) {
> + /*
> + * virtio-v1.2-csd01, 5.14.6.6.5.1,
> + * Device Requirements: Stream Release
> + *
> + * - The device MUST complete all pending I/O messages for the
> + * specified stream ID.
> + * - The device MUST NOT complete the control request while there
> + * are pending I/O messages for the specified stream ID.
> + */
> + virtio_snd_process_cmdq(stream->s);
> + trace_virtio_snd_pcm_stream_flush(stream_id);
> + virtio_snd_pcm_flush(stream);
> + }
> +
> + return VIRTIO_SND_S_OK;
> +}
> +
> +/*
> + * Handles VIRTIO_SND_R_PCM_RELEASE.
> + *
> + * @s: VirtIOSound device
> + * @cmd: The request command queue element from VirtIOSound cmdq field
> + */
> +static void virtio_snd_handle_pcm_release(VirtIOSound *s,
> + virtio_snd_ctrl_command *cmd)
> +{
> + uint32_t stream_id;
> + size_t sz;
> + VirtIOSoundPCMStream *stream;
> +
> + sz = iov_to_buf(cmd->elem->out_sg, cmd->elem->out_num,
> + sizeof(virtio_snd_hdr), &stream_id, sizeof(stream_id));
> + assert(sz == sizeof(uint32_t));
ditto
> +
> + trace_virtio_snd_handle_pcm_release(stream_id);
> +
> + stream = virtio_snd_pcm_get_stream(s, stream_id);
> + if (!stream) {
> + error_report("already released stream %d", stream_id);
> + virtio_error(VIRTIO_DEVICE(s), "already released stream %d",
> stream_id);
> + cmd->resp.code = VIRTIO_SND_S_BAD_MSG;
> + return;
> + }
> + cmd->resp.code = virtio_snd_pcm_release_impl(stream, stream_id);
> + return;
> +}
> +
> +/*
> + * The actual processing done in virtio_snd_process_cmdq().
> + *
> + * @s: VirtIOSound device
> + * @cmd: control command request
> + */
> +static inline void
> +process_cmd(VirtIOSound *s, virtio_snd_ctrl_command *cmd)
> +{
> + VIRTIO_SND_FILL_CMD(cmd->ctrl);
> + size_t sz;
> +
> + trace_virtio_snd_handle_code(cmd->ctrl.code,
> + print_code(cmd->ctrl.code));
> +
> + switch (cmd->ctrl.code) {
> + case VIRTIO_SND_R_JACK_INFO:
> + case VIRTIO_SND_R_JACK_REMAP:
> + qemu_log_mask(LOG_UNIMP,
> + "virtio_snd: jack functionality is unimplemented.");
> + break;
> + case VIRTIO_SND_R_PCM_INFO:
> + virtio_snd_handle_pcm_info(s, cmd);
> + break;
> + case VIRTIO_SND_R_PCM_SET_PARAMS:
> + virtio_snd_handle_pcm_set_params(s, cmd);
> + break;
> + case VIRTIO_SND_R_PCM_PREPARE:
> + virtio_snd_handle_pcm_prepare(s, cmd);
> + break;
> + case VIRTIO_SND_R_PCM_START:
> + virtio_snd_handle_pcm_start_stop(s, cmd, true);
> + break;
> + case VIRTIO_SND_R_PCM_STOP:
> + virtio_snd_handle_pcm_start_stop(s, cmd, false);
> + break;
> + case VIRTIO_SND_R_PCM_RELEASE:
> + virtio_snd_handle_pcm_release(s, cmd);
> + break;
> + case VIRTIO_SND_R_CHMAP_INFO:
> + qemu_log_mask(LOG_UNIMP,
> + "virtio_snd: chmap info functionality is
> unimplemented.");
> + trace_virtio_snd_handle_chmap_info();
> + break;
> + default:
> + /* error */
> + error_report("virtio snd header not recognized: %d", cmd->ctrl.code);
> + cmd->resp.code = VIRTIO_SND_S_BAD_MSG;
> + }
> +
> + sz = iov_from_buf(cmd->elem->in_sg,
> + cmd->elem->in_num,
> + 0,
> + &cmd->resp,
> + sizeof(cmd->resp));
> + assert(sz == sizeof(cmd->resp));
> + virtqueue_push(cmd->vq, cmd->elem, sizeof(cmd->elem));
> + virtio_notify(VIRTIO_DEVICE(s), cmd->vq);
> + cmd->finished = true;
> +}
> +
> +/*
> + * Consume all elements in command queue.
> + *
> + * @s: VirtIOSound device
> + */
> +static void virtio_snd_process_cmdq(VirtIOSound *s)
> +{
> + virtio_snd_ctrl_command *cmd;
> +
> + if (unlikely(qatomic_read(&s->processing_cmdq))) {
> + return;
> + }
> +
> + WITH_QEMU_LOCK_GUARD(&s->cmdq_mutex) {
> + qatomic_set(&s->processing_cmdq, true);
> + while (!QTAILQ_EMPTY(&s->cmdq)) {
> + cmd = QTAILQ_FIRST(&s->cmdq);
> +
> + /* process command */
> + process_cmd(s, cmd);
> +
> + QTAILQ_REMOVE(&s->cmdq, cmd, next);
> +
> + assert(cmd->finished);
> + g_free(cmd);
> + }
> + qatomic_set(&s->processing_cmdq, false);
> + }
> +}
> +
> +/*
> + * The control message handler. Pops an element from the control virtqueue,
> + * and stores them to VirtIOSound's cmdq queue and finally calls
> + * virtio_snd_process_cmdq() for processing.
> + *
> + * @vdev: VirtIOSound device
> + * @vq: Control virtqueue
> + */
> +static void virtio_snd_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
> +{
> + VirtIOSound *s = VIRTIO_SND(vdev);
> + VirtQueueElement *elem;
> + virtio_snd_ctrl_command *cmd;
> +
> + trace_virtio_snd_handle_ctrl(vdev, vq);
> +
> + if (!virtio_queue_ready(vq)) {
> + return;
> + }
> +
> + elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> + while (elem) {
> + cmd = g_new0(virtio_snd_ctrl_command, 1);
> + cmd->elem = elem;
> + cmd->vq = vq;
> + cmd->finished = false;
> + cmd->resp.code = VIRTIO_SND_S_OK;
> + QTAILQ_INSERT_TAIL(&s->cmdq, cmd, next);
> + elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> + }
> +
> + virtio_snd_process_cmdq(s);
> +}
> +
> +/*
> + * The event virtqueue handler.
> + * Not implemented yet.
> + *
> + * @vdev: VirtIOSound device
> + * @vq: event vq
> + */
> +static void virtio_snd_handle_event(VirtIODevice *vdev, VirtQueue *vq)
> +{
> + qemu_log_mask(LOG_UNIMP, "virtio_snd: event queue is unimplemented.");
> + trace_virtio_snd_handle_event();
> +}
> +
> +/*
> + * The tx virtqueue handler. Makes the buffers available to their respective
> + * streams for consumption.
> + *
> + * @vdev: VirtIOSound device
> + * @vq: tx virtqueue
> + */
> +static void virtio_snd_handle_xfer(VirtIODevice *vdev, VirtQueue *vq)
> +{
> + VirtIOSound *s = VIRTIO_SND(vdev);
> + VirtIOSoundPCMStream *stream = NULL;
> + VirtQueueElement *elem;
> + size_t sz;
> + virtio_snd_pcm_xfer hdr;
> + virtio_snd_pcm_status resp = { 0 };
> +
> + trace_virtio_snd_handle_xfer();
> +
> + for (;;) {
> + elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> + if (!elem) {
> + break;
> + }
> + /* get the message hdr object */
> + sz = iov_to_buf(elem->out_sg,
> + elem->out_num,
> + 0,
> + &hdr,
> + sizeof(hdr));
> + assert(sz == sizeof(hdr));
ditto
I'm stopping now because this patch is too big...
--
Alex Bennée
Virtualisation Tech Lead @ Linaro
| [Prev in Thread] |
Current Thread |
[Next in Thread] |
- Re: [PATCH v2 1/3] Add virtio-sound device,
Alex Bennée <=