Add virtio-sound device stub

Add a new VIRTIO device for the virtio sound device id. Functionality
will be added in the following commits.

Based-on: https://github.com/OpenSynergy/qemu/commit/5a2f350eec5d157b90d9c7b40a8e603f4da92471
Signed-off-by: Igor Skalkin <Igor.Skalkin@opensynergy.com>
Signed-off-by: Anton Yakovlev <Anton.Yakovlev@opensynergy.com>
Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <f9678a41fe97b5886c1b04795f1be046509de866.1698062525.git.manos.pitsidianakis@linaro.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

4 files changed, 248 insertions, 0 deletions

diff --git a/hw/audio/Kconfig b/hw/audio/Kconfig
index d099351..daf060e 100644
--- a/hw/audio/Kconfig
+++ b/hw/audio/Kconfig
@@ -50,3 +50,8 @@ config CS4231
 
 config ASC
     bool
+
+config VIRTIO_SND
+    bool
+    default y
+    depends on VIRTIO
diff --git a/hw/audio/meson.build b/hw/audio/meson.build
index 8805322..7a503be 100644
--- a/hw/audio/meson.build
+++ b/hw/audio/meson.build
@@ -13,3 +13,4 @@ system_ss.add(when: 'CONFIG_PL041', if_true: files('pl041.c', 'lm4549.c'))
 system_ss.add(when: 'CONFIG_SB16', if_true: files('sb16.c'))
 system_ss.add(when: 'CONFIG_VT82C686', if_true: files('via-ac97.c'))
 system_ss.add(when: 'CONFIG_WM8750', if_true: files('wm8750.c'))
+system_ss.add(when: ['CONFIG_VIRTIO_SND', 'CONFIG_VIRTIO'], if_true: files('virtio-snd.c'))
diff --git a/hw/audio/trace-events b/hw/audio/trace-events
index 059ce45..525ced2 100644
--- a/hw/audio/trace-events
+++ b/hw/audio/trace-events
@@ -38,3 +38,12 @@ asc_write_fifo(const char fifo, int reg, unsigned size, int wrptr, int cnt, uint
 asc_write_reg(int reg, unsigned size, uint64_t value) "reg=0x%03x size=%u value=0x%"PRIx64
 asc_write_extreg(const char fifo, int reg, unsigned size, uint64_t value) "fifo %c reg=0x%03x size=%u value=0x%"PRIx64
 asc_update_irq(int irq, int a, int b) "set IRQ to %d (A: 0x%x B: 0x%x)"
+
+#virtio-snd.c
+virtio_snd_get_config(void *vdev, uint32_t jacks, uint32_t streams, uint32_t chmaps) "snd %p: get_config jacks=%"PRIu32" streams=%"PRIu32" chmaps=%"PRIu32""
+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 %"PRIu32"->%"PRIu32", streams from %"PRIu32"->%"PRIu32", chmaps from %"PRIu32"->%"PRIu32
+virtio_snd_get_features(void *vdev, uint64_t features) "snd %p: get_features 0x%"PRIx64
+virtio_snd_vm_state_running(void) "vm state running"
+virtio_snd_vm_state_stopped(void) "vm state stopped"
+virtio_snd_realize(void *snd) "snd %p: realize"
+virtio_snd_unrealize(void *snd) "snd %p: unrealize"
diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
new file mode 100644
index 0000000..3a4b441
--- /dev/null
+++ b/hw/audio/virtio-snd.c
@@ -0,0 +1,233 @@
+/*
+ * 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)