qemu/hw/audio/virtio-snd.c

/*
 * VIRTIO Sound Device conforming to
 *
 * "Virtual I/O Device (VIRTIO) Version 1.2
 * Committee Specification Draft 01
 * 09 May 2022"
 *
 * <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.
 */

#include "qemu/osdep.h"
#include "qemu/iov.h"
#include "qemu/log.h"
#include "qemu/error-report.h"
#include "include/qemu/lockable.h"
#include "sysemu/runstate.h"
#include "trace.h"
#include "qapi/error.h"
#include "hw/audio/virtio-snd.h"
#include "hw/core/cpu.h"

#define VIRTIO_SOUND_VM_VERSION 1
#define VIRTIO_SOUND_JACK_DEFAULT 0
#define VIRTIO_SOUND_STREAM_DEFAULT 1
#define VIRTIO_SOUND_CHMAP_DEFAULT 0
#define VIRTIO_SOUND_HDA_FN_NID 0

static const VMStateDescription vmstate_virtio_snd_device = {
    .name = TYPE_VIRTIO_SND,
    .version_id = VIRTIO_SOUND_VM_VERSION,
    .minimum_version_id = VIRTIO_SOUND_VM_VERSION,
};

static const VMStateDescription vmstate_virtio_snd = {
    .name = TYPE_VIRTIO_SND,
    .minimum_version_id = VIRTIO_SOUND_VM_VERSION,
    .version_id = VIRTIO_SOUND_VM_VERSION,
    .fields = (VMStateField[]) {
        VMSTATE_VIRTIO_DEVICE,
        VMSTATE_END_OF_LIST()
    },
};

static Property virtio_snd_properties[] = {
    DEFINE_AUDIO_PROPERTIES(VirtIOSound, card),
    DEFINE_PROP_UINT32("jacks", VirtIOSound, snd_conf.jacks,
                       VIRTIO_SOUND_JACK_DEFAULT),
    DEFINE_PROP_UINT32("streams", VirtIOSound, snd_conf.streams,
                       VIRTIO_SOUND_STREAM_DEFAULT),
    DEFINE_PROP_UINT32("chmaps", VirtIOSound, snd_conf.chmaps,
                       VIRTIO_SOUND_CHMAP_DEFAULT),
    DEFINE_PROP_END_OF_LIST(),
};

static void
virtio_snd_get_config(VirtIODevice *vdev, uint8_t *config)
{
    VirtIOSound *s = VIRTIO_SND(vdev);
    virtio_snd_config *sndconfig =
        (virtio_snd_config *)config;
    trace_virtio_snd_get_config(vdev,
                                s->snd_conf.jacks,
                                s->snd_conf.streams,
                                s->snd_conf.chmaps);

    memcpy(sndconfig, &s->snd_conf, sizeof(s->snd_conf));
    cpu_to_le32s(&sndconfig->jacks);
    cpu_to_le32s(&sndconfig->streams);
    cpu_to_le32s(&sndconfig->chmaps);

}

static void
virtio_snd_set_config(VirtIODevice *vdev, const uint8_t *config)
{
    VirtIOSound *s = VIRTIO_SND(vdev);
    const virtio_snd_config *sndconfig =
        (const virtio_snd_config *)config;


   trace_virtio_snd_set_config(vdev,
                               s->snd_conf.jacks,
                               sndconfig->jacks,
                               s->snd_conf.streams,
                               sndconfig->streams,
                               s->snd_conf.chmaps,
                               sndconfig->chmaps);

    memcpy(&s->snd_conf, sndconfig, sizeof(virtio_snd_config));
    le32_to_cpus(&s->snd_conf.jacks);
    le32_to_cpus(&s->snd_conf.streams);
    le32_to_cpus(&s->snd_conf.chmaps);

}

/*
 * Queue handler stub.
 *
 * @vdev: VirtIOSound device
 * @vq: virtqueue
 */
static void virtio_snd_handle_queue(VirtIODevice *vdev, VirtQueue *vq) {}

static uint64_t get_features(VirtIODevice *vdev, uint64_t features,
                             Error **errp)
{
    /*
     * virtio-v1.2-csd01, 5.14.3,
     * Feature Bits
     * None currently defined.
     */
    VirtIOSound *s = VIRTIO_SND(vdev);
    features |= s->features;

    trace_virtio_snd_get_features(vdev, features);

    return features;
}

static void
virtio_snd_vm_state_change(void *opaque, bool running,
                                       RunState state)
{
    if (running) {
        trace_virtio_snd_vm_state_running();
    } else {
        trace_virtio_snd_vm_state_stopped();
    }
}

static void virtio_snd_realize(DeviceState *dev, Error **errp)
{
    ERRP_GUARD();
    VirtIOSound *vsnd = VIRTIO_SND(dev);
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);

    vsnd->vmstate =
        qemu_add_vm_change_state_handler(virtio_snd_vm_state_change, vsnd);

    trace_virtio_snd_realize(vsnd);

    virtio_init(vdev, VIRTIO_ID_SOUND, sizeof(virtio_snd_config));
    virtio_add_feature(&vsnd->features, VIRTIO_F_VERSION_1);

    /* set number of jacks and streams */
    if (vsnd->snd_conf.jacks > 8) {
        error_setg(errp,
                   "Invalid number of jacks: %"PRIu32,
                   vsnd->snd_conf.jacks);
        return;
    }
    if (vsnd->snd_conf.streams < 1 || vsnd->snd_conf.streams > 10) {
        error_setg(errp,
                   "Invalid number of streams: %"PRIu32,
                    vsnd->snd_conf.streams);
        return;
    }

    if (vsnd->snd_conf.chmaps > VIRTIO_SND_CHMAP_MAX_SIZE) {
        error_setg(errp,
                   "Invalid number of channel maps: %"PRIu32,
                   vsnd->snd_conf.chmaps);
        return;
    }

    AUD_register_card("virtio-sound", &vsnd->card, errp);

    vsnd->queues[VIRTIO_SND_VQ_CONTROL] =
        virtio_add_queue(vdev, 64, virtio_snd_handle_queue);
    vsnd->queues[VIRTIO_SND_VQ_EVENT] =
        virtio_add_queue(vdev, 64, virtio_snd_handle_queue);
    vsnd->queues[VIRTIO_SND_VQ_TX] =
        virtio_add_queue(vdev, 64, virtio_snd_handle_queue);
    vsnd->queues[VIRTIO_SND_VQ_RX] =
        virtio_add_queue(vdev, 64, virtio_snd_handle_queue);
}

static void virtio_snd_unrealize(DeviceState *dev)
{
    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
    VirtIOSound *vsnd = VIRTIO_SND(dev);

    qemu_del_vm_change_state_handler(vsnd->vmstate);
    trace_virtio_snd_unrealize(vsnd);

    AUD_remove_card(&vsnd->card);
    virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_CONTROL]);
    virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_EVENT]);
    virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_TX]);
    virtio_delete_queue(vsnd->queues[VIRTIO_SND_VQ_RX]);
    virtio_cleanup(vdev);
}


static void virtio_snd_reset(VirtIODevice *vdev) {}

static void virtio_snd_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);


    set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
    device_class_set_props(dc, virtio_snd_properties);

    dc->vmsd = &vmstate_virtio_snd;
    vdc->vmsd = &vmstate_virtio_snd_device;
    vdc->realize = virtio_snd_realize;
    vdc->unrealize = virtio_snd_unrealize;
    vdc->get_config = virtio_snd_get_config;
    vdc->set_config = virtio_snd_set_config;
    vdc->get_features = get_features;
    vdc->reset = virtio_snd_reset;
    vdc->legacy_features = 0;
}

static const TypeInfo virtio_snd_types[] = {
    {
      .name          = TYPE_VIRTIO_SND,
      .parent        = TYPE_VIRTIO_DEVICE,
      .instance_size = sizeof(VirtIOSound),
      .class_init    = virtio_snd_class_init,
    }
};

DEFINE_TYPES(virtio_snd_types)