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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /sound/virtio
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'sound/virtio')
-rw-r--r--sound/virtio/Kconfig10
-rw-r--r--sound/virtio/Makefile13
-rw-r--r--sound/virtio/virtio_card.c439
-rw-r--r--sound/virtio/virtio_card.h111
-rw-r--r--sound/virtio/virtio_chmap.c219
-rw-r--r--sound/virtio/virtio_ctl_msg.c310
-rw-r--r--sound/virtio/virtio_ctl_msg.h78
-rw-r--r--sound/virtio/virtio_jack.c233
-rw-r--r--sound/virtio/virtio_pcm.c513
-rw-r--r--sound/virtio/virtio_pcm.h124
-rw-r--r--sound/virtio/virtio_pcm_msg.c413
-rw-r--r--sound/virtio/virtio_pcm_ops.c464
12 files changed, 2927 insertions, 0 deletions
diff --git a/sound/virtio/Kconfig b/sound/virtio/Kconfig
new file mode 100644
index 0000000000..094cba24ee
--- /dev/null
+++ b/sound/virtio/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Sound card driver for virtio
+
+config SND_VIRTIO
+ tristate "Virtio sound driver"
+ depends on VIRTIO
+ select SND_PCM
+ select SND_JACK
+ help
+ This is the virtual sound driver for virtio. Say Y or M.
diff --git a/sound/virtio/Makefile b/sound/virtio/Makefile
new file mode 100644
index 0000000000..2742bddb88
--- /dev/null
+++ b/sound/virtio/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0+
+
+obj-$(CONFIG_SND_VIRTIO) += virtio_snd.o
+
+virtio_snd-objs := \
+ virtio_card.o \
+ virtio_chmap.o \
+ virtio_ctl_msg.o \
+ virtio_jack.o \
+ virtio_pcm.o \
+ virtio_pcm_msg.o \
+ virtio_pcm_ops.o
+
diff --git a/sound/virtio/virtio_card.c b/sound/virtio/virtio_card.c
new file mode 100644
index 0000000000..e2847c040f
--- /dev/null
+++ b/sound/virtio/virtio_card.c
@@ -0,0 +1,439 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/virtio_config.h>
+#include <sound/initval.h>
+#include <uapi/linux/virtio_ids.h>
+
+#include "virtio_card.h"
+
+u32 virtsnd_msg_timeout_ms = MSEC_PER_SEC;
+module_param_named(msg_timeout_ms, virtsnd_msg_timeout_ms, uint, 0644);
+MODULE_PARM_DESC(msg_timeout_ms, "Message completion timeout in milliseconds");
+
+static void virtsnd_remove(struct virtio_device *vdev);
+
+/**
+ * virtsnd_event_send() - Add an event to the event queue.
+ * @vqueue: Underlying event virtqueue.
+ * @event: Event.
+ * @notify: Indicates whether or not to send a notification to the device.
+ * @gfp: Kernel flags for memory allocation.
+ *
+ * Context: Any context.
+ */
+static void virtsnd_event_send(struct virtqueue *vqueue,
+ struct virtio_snd_event *event, bool notify,
+ gfp_t gfp)
+{
+ struct scatterlist sg;
+ struct scatterlist *psgs[1] = { &sg };
+
+ /* reset event content */
+ memset(event, 0, sizeof(*event));
+
+ sg_init_one(&sg, event, sizeof(*event));
+
+ if (virtqueue_add_sgs(vqueue, psgs, 0, 1, event, gfp) || !notify)
+ return;
+
+ if (virtqueue_kick_prepare(vqueue))
+ virtqueue_notify(vqueue);
+}
+
+/**
+ * virtsnd_event_dispatch() - Dispatch an event from the device side.
+ * @snd: VirtIO sound device.
+ * @event: VirtIO sound event.
+ *
+ * Context: Any context.
+ */
+static void virtsnd_event_dispatch(struct virtio_snd *snd,
+ struct virtio_snd_event *event)
+{
+ switch (le32_to_cpu(event->hdr.code)) {
+ case VIRTIO_SND_EVT_JACK_CONNECTED:
+ case VIRTIO_SND_EVT_JACK_DISCONNECTED:
+ virtsnd_jack_event(snd, event);
+ break;
+ case VIRTIO_SND_EVT_PCM_PERIOD_ELAPSED:
+ case VIRTIO_SND_EVT_PCM_XRUN:
+ virtsnd_pcm_event(snd, event);
+ break;
+ }
+}
+
+/**
+ * virtsnd_event_notify_cb() - Dispatch all reported events from the event queue.
+ * @vqueue: Underlying event virtqueue.
+ *
+ * This callback function is called upon a vring interrupt request from the
+ * device.
+ *
+ * Context: Interrupt context.
+ */
+static void virtsnd_event_notify_cb(struct virtqueue *vqueue)
+{
+ struct virtio_snd *snd = vqueue->vdev->priv;
+ struct virtio_snd_queue *queue = virtsnd_event_queue(snd);
+ struct virtio_snd_event *event;
+ u32 length;
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ do {
+ virtqueue_disable_cb(vqueue);
+ while ((event = virtqueue_get_buf(vqueue, &length))) {
+ virtsnd_event_dispatch(snd, event);
+ virtsnd_event_send(vqueue, event, true, GFP_ATOMIC);
+ }
+ if (unlikely(virtqueue_is_broken(vqueue)))
+ break;
+ } while (!virtqueue_enable_cb(vqueue));
+ spin_unlock_irqrestore(&queue->lock, flags);
+}
+
+/**
+ * virtsnd_find_vqs() - Enumerate and initialize all virtqueues.
+ * @snd: VirtIO sound device.
+ *
+ * After calling this function, the event queue is disabled.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_find_vqs(struct virtio_snd *snd)
+{
+ struct virtio_device *vdev = snd->vdev;
+ static vq_callback_t *callbacks[VIRTIO_SND_VQ_MAX] = {
+ [VIRTIO_SND_VQ_CONTROL] = virtsnd_ctl_notify_cb,
+ [VIRTIO_SND_VQ_EVENT] = virtsnd_event_notify_cb,
+ [VIRTIO_SND_VQ_TX] = virtsnd_pcm_tx_notify_cb,
+ [VIRTIO_SND_VQ_RX] = virtsnd_pcm_rx_notify_cb
+ };
+ static const char *names[VIRTIO_SND_VQ_MAX] = {
+ [VIRTIO_SND_VQ_CONTROL] = "virtsnd-ctl",
+ [VIRTIO_SND_VQ_EVENT] = "virtsnd-event",
+ [VIRTIO_SND_VQ_TX] = "virtsnd-tx",
+ [VIRTIO_SND_VQ_RX] = "virtsnd-rx"
+ };
+ struct virtqueue *vqs[VIRTIO_SND_VQ_MAX] = { 0 };
+ unsigned int i;
+ unsigned int n;
+ int rc;
+
+ rc = virtio_find_vqs(vdev, VIRTIO_SND_VQ_MAX, vqs, callbacks, names,
+ NULL);
+ if (rc) {
+ dev_err(&vdev->dev, "failed to initialize virtqueues\n");
+ return rc;
+ }
+
+ for (i = 0; i < VIRTIO_SND_VQ_MAX; ++i)
+ snd->queues[i].vqueue = vqs[i];
+
+ /* Allocate events and populate the event queue */
+ virtqueue_disable_cb(vqs[VIRTIO_SND_VQ_EVENT]);
+
+ n = virtqueue_get_vring_size(vqs[VIRTIO_SND_VQ_EVENT]);
+
+ snd->event_msgs = kmalloc_array(n, sizeof(*snd->event_msgs),
+ GFP_KERNEL);
+ if (!snd->event_msgs)
+ return -ENOMEM;
+
+ for (i = 0; i < n; ++i)
+ virtsnd_event_send(vqs[VIRTIO_SND_VQ_EVENT],
+ &snd->event_msgs[i], false, GFP_KERNEL);
+
+ return 0;
+}
+
+/**
+ * virtsnd_enable_event_vq() - Enable the event virtqueue.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context.
+ */
+static void virtsnd_enable_event_vq(struct virtio_snd *snd)
+{
+ struct virtio_snd_queue *queue = virtsnd_event_queue(snd);
+
+ if (!virtqueue_enable_cb(queue->vqueue))
+ virtsnd_event_notify_cb(queue->vqueue);
+}
+
+/**
+ * virtsnd_disable_event_vq() - Disable the event virtqueue.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context.
+ */
+static void virtsnd_disable_event_vq(struct virtio_snd *snd)
+{
+ struct virtio_snd_queue *queue = virtsnd_event_queue(snd);
+ struct virtio_snd_event *event;
+ u32 length;
+ unsigned long flags;
+
+ if (queue->vqueue) {
+ spin_lock_irqsave(&queue->lock, flags);
+ virtqueue_disable_cb(queue->vqueue);
+ while ((event = virtqueue_get_buf(queue->vqueue, &length)))
+ virtsnd_event_dispatch(snd, event);
+ spin_unlock_irqrestore(&queue->lock, flags);
+ }
+}
+
+/**
+ * virtsnd_build_devs() - Read configuration and build ALSA devices.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_build_devs(struct virtio_snd *snd)
+{
+ struct virtio_device *vdev = snd->vdev;
+ struct device *dev = &vdev->dev;
+ int rc;
+
+ rc = snd_card_new(dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
+ THIS_MODULE, 0, &snd->card);
+ if (rc < 0)
+ return rc;
+
+ snd->card->private_data = snd;
+
+ strscpy(snd->card->driver, VIRTIO_SND_CARD_DRIVER,
+ sizeof(snd->card->driver));
+ strscpy(snd->card->shortname, VIRTIO_SND_CARD_NAME,
+ sizeof(snd->card->shortname));
+ if (dev->parent->bus)
+ snprintf(snd->card->longname, sizeof(snd->card->longname),
+ VIRTIO_SND_CARD_NAME " at %s/%s/%s",
+ dev->parent->bus->name, dev_name(dev->parent),
+ dev_name(dev));
+ else
+ snprintf(snd->card->longname, sizeof(snd->card->longname),
+ VIRTIO_SND_CARD_NAME " at %s/%s",
+ dev_name(dev->parent), dev_name(dev));
+
+ rc = virtsnd_jack_parse_cfg(snd);
+ if (rc)
+ return rc;
+
+ rc = virtsnd_pcm_parse_cfg(snd);
+ if (rc)
+ return rc;
+
+ rc = virtsnd_chmap_parse_cfg(snd);
+ if (rc)
+ return rc;
+
+ if (snd->njacks) {
+ rc = virtsnd_jack_build_devs(snd);
+ if (rc)
+ return rc;
+ }
+
+ if (snd->nsubstreams) {
+ rc = virtsnd_pcm_build_devs(snd);
+ if (rc)
+ return rc;
+ }
+
+ if (snd->nchmaps) {
+ rc = virtsnd_chmap_build_devs(snd);
+ if (rc)
+ return rc;
+ }
+
+ return snd_card_register(snd->card);
+}
+
+/**
+ * virtsnd_validate() - Validate if the device can be started.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -EINVAL on failure.
+ */
+static int virtsnd_validate(struct virtio_device *vdev)
+{
+ if (!vdev->config->get) {
+ dev_err(&vdev->dev, "configuration access disabled\n");
+ return -EINVAL;
+ }
+
+ if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
+ dev_err(&vdev->dev,
+ "device does not comply with spec version 1.x\n");
+ return -EINVAL;
+ }
+
+ if (!virtsnd_msg_timeout_ms) {
+ dev_err(&vdev->dev, "msg_timeout_ms value cannot be zero\n");
+ return -EINVAL;
+ }
+
+ if (virtsnd_pcm_validate(vdev))
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * virtsnd_probe() - Create and initialize the device.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_probe(struct virtio_device *vdev)
+{
+ struct virtio_snd *snd;
+ unsigned int i;
+ int rc;
+
+ snd = devm_kzalloc(&vdev->dev, sizeof(*snd), GFP_KERNEL);
+ if (!snd)
+ return -ENOMEM;
+
+ snd->vdev = vdev;
+ INIT_LIST_HEAD(&snd->ctl_msgs);
+ INIT_LIST_HEAD(&snd->pcm_list);
+
+ vdev->priv = snd;
+
+ for (i = 0; i < VIRTIO_SND_VQ_MAX; ++i)
+ spin_lock_init(&snd->queues[i].lock);
+
+ rc = virtsnd_find_vqs(snd);
+ if (rc)
+ goto on_exit;
+
+ virtio_device_ready(vdev);
+
+ rc = virtsnd_build_devs(snd);
+ if (rc)
+ goto on_exit;
+
+ virtsnd_enable_event_vq(snd);
+
+on_exit:
+ if (rc)
+ virtsnd_remove(vdev);
+
+ return rc;
+}
+
+/**
+ * virtsnd_remove() - Remove VirtIO and ALSA devices.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context that permits to sleep.
+ */
+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);
+
+ if (snd->card)
+ snd_card_free(snd->card);
+
+ vdev->config->del_vqs(vdev);
+ virtio_reset_device(vdev);
+
+ for (i = 0; snd->substreams && i < snd->nsubstreams; ++i) {
+ struct virtio_pcm_substream *vss = &snd->substreams[i];
+
+ cancel_work_sync(&vss->elapsed_period);
+ virtsnd_pcm_msg_free(vss);
+ }
+
+ kfree(snd->event_msgs);
+}
+
+#ifdef CONFIG_PM_SLEEP
+/**
+ * virtsnd_freeze() - Suspend device.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_freeze(struct virtio_device *vdev)
+{
+ struct virtio_snd *snd = vdev->priv;
+ unsigned int i;
+
+ virtsnd_disable_event_vq(snd);
+ virtsnd_ctl_msg_cancel_all(snd);
+
+ vdev->config->del_vqs(vdev);
+ virtio_reset_device(vdev);
+
+ for (i = 0; i < snd->nsubstreams; ++i)
+ cancel_work_sync(&snd->substreams[i].elapsed_period);
+
+ kfree(snd->event_msgs);
+ snd->event_msgs = NULL;
+
+ return 0;
+}
+
+/**
+ * virtsnd_restore() - Resume device.
+ * @vdev: VirtIO parent device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_restore(struct virtio_device *vdev)
+{
+ struct virtio_snd *snd = vdev->priv;
+ int rc;
+
+ rc = virtsnd_find_vqs(snd);
+ if (rc)
+ return rc;
+
+ virtio_device_ready(vdev);
+
+ virtsnd_enable_event_vq(snd);
+
+ return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_SOUND, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct virtio_driver virtsnd_driver = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .validate = virtsnd_validate,
+ .probe = virtsnd_probe,
+ .remove = virtsnd_remove,
+#ifdef CONFIG_PM_SLEEP
+ .freeze = virtsnd_freeze,
+ .restore = virtsnd_restore,
+#endif
+};
+
+module_virtio_driver(virtsnd_driver);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio sound card driver");
+MODULE_LICENSE("GPL");
diff --git a/sound/virtio/virtio_card.h b/sound/virtio/virtio_card.h
new file mode 100644
index 0000000000..86ef394189
--- /dev/null
+++ b/sound/virtio/virtio_card.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#ifndef VIRTIO_SND_CARD_H
+#define VIRTIO_SND_CARD_H
+
+#include <linux/slab.h>
+#include <linux/virtio.h>
+#include <sound/core.h>
+#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_jack;
+struct virtio_pcm_substream;
+
+/**
+ * struct virtio_snd_queue - Virtqueue wrapper structure.
+ * @lock: Used to synchronize access to a virtqueue.
+ * @vqueue: Underlying virtqueue.
+ */
+struct virtio_snd_queue {
+ spinlock_t lock;
+ struct virtqueue *vqueue;
+};
+
+/**
+ * struct virtio_snd - VirtIO sound card device.
+ * @vdev: Underlying virtio device.
+ * @queues: Virtqueue wrappers.
+ * @card: ALSA sound card.
+ * @ctl_msgs: Pending control request list.
+ * @event_msgs: Device events.
+ * @pcm_list: VirtIO PCM device list.
+ * @jacks: VirtIO jacks.
+ * @njacks: Number of jacks.
+ * @substreams: VirtIO PCM substreams.
+ * @nsubstreams: Number of PCM substreams.
+ * @chmaps: VirtIO channel maps.
+ * @nchmaps: Number of channel maps.
+ */
+struct virtio_snd {
+ struct virtio_device *vdev;
+ struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX];
+ struct snd_card *card;
+ struct list_head ctl_msgs;
+ struct virtio_snd_event *event_msgs;
+ struct list_head pcm_list;
+ struct virtio_jack *jacks;
+ u32 njacks;
+ struct virtio_pcm_substream *substreams;
+ u32 nsubstreams;
+ struct virtio_snd_chmap_info *chmaps;
+ u32 nchmaps;
+};
+
+/* Message completion timeout in milliseconds (module parameter). */
+extern u32 virtsnd_msg_timeout_ms;
+
+static inline struct virtio_snd_queue *
+virtsnd_control_queue(struct virtio_snd *snd)
+{
+ return &snd->queues[VIRTIO_SND_VQ_CONTROL];
+}
+
+static inline struct virtio_snd_queue *
+virtsnd_event_queue(struct virtio_snd *snd)
+{
+ return &snd->queues[VIRTIO_SND_VQ_EVENT];
+}
+
+static inline struct virtio_snd_queue *
+virtsnd_tx_queue(struct virtio_snd *snd)
+{
+ return &snd->queues[VIRTIO_SND_VQ_TX];
+}
+
+static inline struct virtio_snd_queue *
+virtsnd_rx_queue(struct virtio_snd *snd)
+{
+ return &snd->queues[VIRTIO_SND_VQ_RX];
+}
+
+static inline struct virtio_snd_queue *
+virtsnd_pcm_queue(struct virtio_pcm_substream *vss)
+{
+ if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ return virtsnd_tx_queue(vss->snd);
+ else
+ return virtsnd_rx_queue(vss->snd);
+}
+
+int virtsnd_jack_parse_cfg(struct virtio_snd *snd);
+
+int virtsnd_jack_build_devs(struct virtio_snd *snd);
+
+void virtsnd_jack_event(struct virtio_snd *snd,
+ struct virtio_snd_event *event);
+
+int virtsnd_chmap_parse_cfg(struct virtio_snd *snd);
+
+int virtsnd_chmap_build_devs(struct virtio_snd *snd);
+
+#endif /* VIRTIO_SND_CARD_H */
diff --git a/sound/virtio/virtio_chmap.c b/sound/virtio/virtio_chmap.c
new file mode 100644
index 0000000000..5bc924933a
--- /dev/null
+++ b/sound/virtio/virtio_chmap.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#include <linux/virtio_config.h>
+
+#include "virtio_card.h"
+
+/* VirtIO->ALSA channel position map */
+static const u8 g_v2a_position_map[] = {
+ [VIRTIO_SND_CHMAP_NONE] = SNDRV_CHMAP_UNKNOWN,
+ [VIRTIO_SND_CHMAP_NA] = SNDRV_CHMAP_NA,
+ [VIRTIO_SND_CHMAP_MONO] = SNDRV_CHMAP_MONO,
+ [VIRTIO_SND_CHMAP_FL] = SNDRV_CHMAP_FL,
+ [VIRTIO_SND_CHMAP_FR] = SNDRV_CHMAP_FR,
+ [VIRTIO_SND_CHMAP_RL] = SNDRV_CHMAP_RL,
+ [VIRTIO_SND_CHMAP_RR] = SNDRV_CHMAP_RR,
+ [VIRTIO_SND_CHMAP_FC] = SNDRV_CHMAP_FC,
+ [VIRTIO_SND_CHMAP_LFE] = SNDRV_CHMAP_LFE,
+ [VIRTIO_SND_CHMAP_SL] = SNDRV_CHMAP_SL,
+ [VIRTIO_SND_CHMAP_SR] = SNDRV_CHMAP_SR,
+ [VIRTIO_SND_CHMAP_RC] = SNDRV_CHMAP_RC,
+ [VIRTIO_SND_CHMAP_FLC] = SNDRV_CHMAP_FLC,
+ [VIRTIO_SND_CHMAP_FRC] = SNDRV_CHMAP_FRC,
+ [VIRTIO_SND_CHMAP_RLC] = SNDRV_CHMAP_RLC,
+ [VIRTIO_SND_CHMAP_RRC] = SNDRV_CHMAP_RRC,
+ [VIRTIO_SND_CHMAP_FLW] = SNDRV_CHMAP_FLW,
+ [VIRTIO_SND_CHMAP_FRW] = SNDRV_CHMAP_FRW,
+ [VIRTIO_SND_CHMAP_FLH] = SNDRV_CHMAP_FLH,
+ [VIRTIO_SND_CHMAP_FCH] = SNDRV_CHMAP_FCH,
+ [VIRTIO_SND_CHMAP_FRH] = SNDRV_CHMAP_FRH,
+ [VIRTIO_SND_CHMAP_TC] = SNDRV_CHMAP_TC,
+ [VIRTIO_SND_CHMAP_TFL] = SNDRV_CHMAP_TFL,
+ [VIRTIO_SND_CHMAP_TFR] = SNDRV_CHMAP_TFR,
+ [VIRTIO_SND_CHMAP_TFC] = SNDRV_CHMAP_TFC,
+ [VIRTIO_SND_CHMAP_TRL] = SNDRV_CHMAP_TRL,
+ [VIRTIO_SND_CHMAP_TRR] = SNDRV_CHMAP_TRR,
+ [VIRTIO_SND_CHMAP_TRC] = SNDRV_CHMAP_TRC,
+ [VIRTIO_SND_CHMAP_TFLC] = SNDRV_CHMAP_TFLC,
+ [VIRTIO_SND_CHMAP_TFRC] = SNDRV_CHMAP_TFRC,
+ [VIRTIO_SND_CHMAP_TSL] = SNDRV_CHMAP_TSL,
+ [VIRTIO_SND_CHMAP_TSR] = SNDRV_CHMAP_TSR,
+ [VIRTIO_SND_CHMAP_LLFE] = SNDRV_CHMAP_LLFE,
+ [VIRTIO_SND_CHMAP_RLFE] = SNDRV_CHMAP_RLFE,
+ [VIRTIO_SND_CHMAP_BC] = SNDRV_CHMAP_BC,
+ [VIRTIO_SND_CHMAP_BLC] = SNDRV_CHMAP_BLC,
+ [VIRTIO_SND_CHMAP_BRC] = SNDRV_CHMAP_BRC
+};
+
+/**
+ * virtsnd_chmap_parse_cfg() - Parse the channel map 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_chmap_parse_cfg(struct virtio_snd *snd)
+{
+ struct virtio_device *vdev = snd->vdev;
+ u32 i;
+ int rc;
+
+ virtio_cread_le(vdev, struct virtio_snd_config, chmaps, &snd->nchmaps);
+ if (!snd->nchmaps)
+ return 0;
+
+ snd->chmaps = devm_kcalloc(&vdev->dev, snd->nchmaps,
+ sizeof(*snd->chmaps), GFP_KERNEL);
+ if (!snd->chmaps)
+ return -ENOMEM;
+
+ rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_CHMAP_INFO, 0,
+ snd->nchmaps, sizeof(*snd->chmaps),
+ snd->chmaps);
+ if (rc)
+ return rc;
+
+ /* Count the number of channel maps per each PCM device/stream. */
+ for (i = 0; i < snd->nchmaps; ++i) {
+ struct virtio_snd_chmap_info *info = &snd->chmaps[i];
+ u32 nid = le32_to_cpu(info->hdr.hda_fn_nid);
+ struct virtio_pcm *vpcm;
+ struct virtio_pcm_stream *vs;
+
+ vpcm = virtsnd_pcm_find_or_create(snd, nid);
+ if (IS_ERR(vpcm))
+ return PTR_ERR(vpcm);
+
+ switch (info->direction) {
+ case VIRTIO_SND_D_OUTPUT:
+ vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
+ break;
+ case VIRTIO_SND_D_INPUT:
+ vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
+ break;
+ default:
+ dev_err(&vdev->dev,
+ "chmap #%u: unknown direction (%u)\n", i,
+ info->direction);
+ return -EINVAL;
+ }
+
+ vs->nchmaps++;
+ }
+
+ return 0;
+}
+
+/**
+ * virtsnd_chmap_add_ctls() - Create an ALSA control for channel maps.
+ * @pcm: ALSA PCM device.
+ * @direction: PCM stream direction (SNDRV_PCM_STREAM_XXX).
+ * @vs: VirtIO PCM stream.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_chmap_add_ctls(struct snd_pcm *pcm, int direction,
+ struct virtio_pcm_stream *vs)
+{
+ u32 i;
+ int max_channels = 0;
+
+ for (i = 0; i < vs->nchmaps; i++)
+ if (max_channels < vs->chmaps[i].channels)
+ max_channels = vs->chmaps[i].channels;
+
+ return snd_pcm_add_chmap_ctls(pcm, direction, vs->chmaps, max_channels,
+ 0, NULL);
+}
+
+/**
+ * virtsnd_chmap_build_devs() - Build ALSA controls for channel maps.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_chmap_build_devs(struct virtio_snd *snd)
+{
+ struct virtio_device *vdev = snd->vdev;
+ struct virtio_pcm *vpcm;
+ struct virtio_pcm_stream *vs;
+ u32 i;
+ int rc;
+
+ /* Allocate channel map elements per each PCM device/stream. */
+ list_for_each_entry(vpcm, &snd->pcm_list, list) {
+ for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
+ vs = &vpcm->streams[i];
+
+ if (!vs->nchmaps)
+ continue;
+
+ vs->chmaps = devm_kcalloc(&vdev->dev, vs->nchmaps + 1,
+ sizeof(*vs->chmaps),
+ GFP_KERNEL);
+ if (!vs->chmaps)
+ return -ENOMEM;
+
+ vs->nchmaps = 0;
+ }
+ }
+
+ /* Initialize channel maps per each PCM device/stream. */
+ for (i = 0; i < snd->nchmaps; ++i) {
+ struct virtio_snd_chmap_info *info = &snd->chmaps[i];
+ unsigned int channels = info->channels;
+ unsigned int ch;
+ struct snd_pcm_chmap_elem *chmap;
+
+ vpcm = virtsnd_pcm_find(snd, le32_to_cpu(info->hdr.hda_fn_nid));
+ if (IS_ERR(vpcm))
+ return PTR_ERR(vpcm);
+
+ if (info->direction == VIRTIO_SND_D_OUTPUT)
+ vs = &vpcm->streams[SNDRV_PCM_STREAM_PLAYBACK];
+ else
+ vs = &vpcm->streams[SNDRV_PCM_STREAM_CAPTURE];
+
+ chmap = &vs->chmaps[vs->nchmaps++];
+
+ if (channels > ARRAY_SIZE(chmap->map))
+ channels = ARRAY_SIZE(chmap->map);
+
+ chmap->channels = channels;
+
+ for (ch = 0; ch < channels; ++ch) {
+ u8 position = info->positions[ch];
+
+ if (position >= ARRAY_SIZE(g_v2a_position_map))
+ return -EINVAL;
+
+ chmap->map[ch] = g_v2a_position_map[position];
+ }
+ }
+
+ /* Create an ALSA control per each PCM device/stream. */
+ list_for_each_entry(vpcm, &snd->pcm_list, list) {
+ if (!vpcm->pcm)
+ continue;
+
+ for (i = 0; i < ARRAY_SIZE(vpcm->streams); ++i) {
+ vs = &vpcm->streams[i];
+
+ if (!vs->nchmaps)
+ continue;
+
+ rc = virtsnd_chmap_add_ctls(vpcm->pcm, i, vs);
+ if (rc)
+ return rc;
+ }
+ }
+
+ return 0;
+}
diff --git a/sound/virtio/virtio_ctl_msg.c b/sound/virtio/virtio_ctl_msg.c
new file mode 100644
index 0000000000..18dc5aca2e
--- /dev/null
+++ b/sound/virtio/virtio_ctl_msg.c
@@ -0,0 +1,310 @@
+// 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"
+
+/**
+ * struct virtio_snd_msg - Control message.
+ * @sg_request: Scattergather list containing a device request (header).
+ * @sg_response: Scattergather list containing a device response (status).
+ * @list: Pending message list entry.
+ * @notify: Request completed notification.
+ * @ref_count: Reference count used to manage a message lifetime.
+ */
+struct virtio_snd_msg {
+ struct scatterlist sg_request;
+ struct scatterlist sg_response;
+ struct list_head list;
+ struct completion notify;
+ refcount_t ref_count;
+};
+
+/**
+ * virtsnd_ctl_msg_ref() - Increment reference counter for the message.
+ * @msg: Control message.
+ *
+ * Context: Any context.
+ */
+void virtsnd_ctl_msg_ref(struct virtio_snd_msg *msg)
+{
+ refcount_inc(&msg->ref_count);
+}
+
+/**
+ * virtsnd_ctl_msg_unref() - Decrement reference counter for the message.
+ * @msg: Control message.
+ *
+ * The message will be freed when the ref_count value is 0.
+ *
+ * Context: Any context.
+ */
+void virtsnd_ctl_msg_unref(struct virtio_snd_msg *msg)
+{
+ if (refcount_dec_and_test(&msg->ref_count))
+ kfree(msg);
+}
+
+/**
+ * virtsnd_ctl_msg_request() - Get a pointer to the request header.
+ * @msg: Control message.
+ *
+ * Context: Any context.
+ */
+void *virtsnd_ctl_msg_request(struct virtio_snd_msg *msg)
+{
+ return sg_virt(&msg->sg_request);
+}
+
+/**
+ * virtsnd_ctl_msg_response() - Get a pointer to the response header.
+ * @msg: Control message.
+ *
+ * Context: Any context.
+ */
+void *virtsnd_ctl_msg_response(struct virtio_snd_msg *msg)
+{
+ return sg_virt(&msg->sg_response);
+}
+
+/**
+ * virtsnd_ctl_msg_alloc() - Allocate and initialize a control message.
+ * @request_size: Size of request header.
+ * @response_size: Size of response header.
+ * @gfp: Kernel flags for memory allocation.
+ *
+ * The message will be automatically freed when the ref_count value is 0.
+ *
+ * Context: Any context. May sleep if @gfp flags permit.
+ * Return: Allocated message on success, NULL on failure.
+ */
+struct virtio_snd_msg *virtsnd_ctl_msg_alloc(size_t request_size,
+ size_t response_size, gfp_t gfp)
+{
+ struct virtio_snd_msg *msg;
+
+ if (!request_size || !response_size)
+ return NULL;
+
+ msg = kzalloc(sizeof(*msg) + request_size + response_size, gfp);
+ if (!msg)
+ return NULL;
+
+ sg_init_one(&msg->sg_request, (u8 *)msg + sizeof(*msg), request_size);
+ sg_init_one(&msg->sg_response, (u8 *)msg + sizeof(*msg) + request_size,
+ response_size);
+
+ INIT_LIST_HEAD(&msg->list);
+ init_completion(&msg->notify);
+ /* This reference is dropped in virtsnd_ctl_msg_complete(). */
+ refcount_set(&msg->ref_count, 1);
+
+ return msg;
+}
+
+/**
+ * virtsnd_ctl_msg_send() - Send a control message.
+ * @snd: VirtIO sound device.
+ * @msg: Control message.
+ * @out_sgs: Additional sg-list to attach to the request header (may be NULL).
+ * @in_sgs: Additional sg-list to attach to the response header (may be NULL).
+ * @nowait: Flag indicating whether to wait for completion.
+ *
+ * Context: Any context. Takes and releases the control queue spinlock.
+ * May sleep if @nowait is false.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_ctl_msg_send(struct virtio_snd *snd, struct virtio_snd_msg *msg,
+ struct scatterlist *out_sgs,
+ struct scatterlist *in_sgs, bool nowait)
+{
+ struct virtio_device *vdev = snd->vdev;
+ struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
+ unsigned int js = msecs_to_jiffies(virtsnd_msg_timeout_ms);
+ struct virtio_snd_hdr *request = virtsnd_ctl_msg_request(msg);
+ struct virtio_snd_hdr *response = virtsnd_ctl_msg_response(msg);
+ unsigned int nouts = 0;
+ unsigned int nins = 0;
+ struct scatterlist *psgs[4];
+ bool notify = false;
+ unsigned long flags;
+ int rc;
+
+ virtsnd_ctl_msg_ref(msg);
+
+ /* Set the default status in case the message was canceled. */
+ response->code = cpu_to_le32(VIRTIO_SND_S_IO_ERR);
+
+ psgs[nouts++] = &msg->sg_request;
+ if (out_sgs)
+ psgs[nouts++] = out_sgs;
+
+ psgs[nouts + nins++] = &msg->sg_response;
+ if (in_sgs)
+ psgs[nouts + nins++] = in_sgs;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ rc = virtqueue_add_sgs(queue->vqueue, psgs, nouts, nins, msg,
+ GFP_ATOMIC);
+ if (!rc) {
+ notify = virtqueue_kick_prepare(queue->vqueue);
+
+ list_add_tail(&msg->list, &snd->ctl_msgs);
+ }
+ spin_unlock_irqrestore(&queue->lock, flags);
+
+ if (rc) {
+ dev_err(&vdev->dev, "failed to send control message (0x%08x)\n",
+ le32_to_cpu(request->code));
+
+ /*
+ * Since in this case virtsnd_ctl_msg_complete() will not be
+ * called, it is necessary to decrement the reference count.
+ */
+ virtsnd_ctl_msg_unref(msg);
+
+ goto on_exit;
+ }
+
+ if (notify)
+ virtqueue_notify(queue->vqueue);
+
+ if (nowait)
+ goto on_exit;
+
+ rc = wait_for_completion_interruptible_timeout(&msg->notify, js);
+ if (rc <= 0) {
+ if (!rc) {
+ dev_err(&vdev->dev,
+ "control message (0x%08x) timeout\n",
+ le32_to_cpu(request->code));
+ rc = -ETIMEDOUT;
+ }
+
+ goto on_exit;
+ }
+
+ switch (le32_to_cpu(response->code)) {
+ case VIRTIO_SND_S_OK:
+ rc = 0;
+ break;
+ case VIRTIO_SND_S_NOT_SUPP:
+ rc = -EOPNOTSUPP;
+ break;
+ case VIRTIO_SND_S_IO_ERR:
+ rc = -EIO;
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+
+on_exit:
+ virtsnd_ctl_msg_unref(msg);
+
+ return rc;
+}
+
+/**
+ * virtsnd_ctl_msg_complete() - Complete a control message.
+ * @msg: Control message.
+ *
+ * Context: Any context. Expects the control queue spinlock to be held by
+ * caller.
+ */
+void virtsnd_ctl_msg_complete(struct virtio_snd_msg *msg)
+{
+ list_del(&msg->list);
+ complete(&msg->notify);
+
+ virtsnd_ctl_msg_unref(msg);
+}
+
+/**
+ * virtsnd_ctl_msg_cancel_all() - Cancel all pending control messages.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context.
+ */
+void virtsnd_ctl_msg_cancel_all(struct virtio_snd *snd)
+{
+ struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ while (!list_empty(&snd->ctl_msgs)) {
+ struct virtio_snd_msg *msg =
+ list_first_entry(&snd->ctl_msgs, struct virtio_snd_msg,
+ list);
+
+ virtsnd_ctl_msg_complete(msg);
+ }
+ spin_unlock_irqrestore(&queue->lock, flags);
+}
+
+/**
+ * virtsnd_ctl_query_info() - Query the item configuration from the device.
+ * @snd: VirtIO sound device.
+ * @command: Control request code (VIRTIO_SND_R_XXX_INFO).
+ * @start_id: Item start identifier.
+ * @count: Item count to query.
+ * @size: Item information size in bytes.
+ * @info: Buffer for storing item information.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_ctl_query_info(struct virtio_snd *snd, int command, int start_id,
+ int count, size_t size, void *info)
+{
+ struct virtio_snd_msg *msg;
+ struct virtio_snd_query_info *query;
+ struct scatterlist sg;
+
+ msg = virtsnd_ctl_msg_alloc(sizeof(*query),
+ sizeof(struct virtio_snd_hdr), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ query = virtsnd_ctl_msg_request(msg);
+ query->hdr.code = cpu_to_le32(command);
+ query->start_id = cpu_to_le32(start_id);
+ query->count = cpu_to_le32(count);
+ query->size = cpu_to_le32(size);
+
+ sg_init_one(&sg, info, count * size);
+
+ return virtsnd_ctl_msg_send(snd, msg, NULL, &sg, false);
+}
+
+/**
+ * virtsnd_ctl_notify_cb() - Process all completed control messages.
+ * @vqueue: Underlying control virtqueue.
+ *
+ * This callback function is called upon a vring interrupt request from the
+ * device.
+ *
+ * Context: Interrupt context. Takes and releases the control queue spinlock.
+ */
+void virtsnd_ctl_notify_cb(struct virtqueue *vqueue)
+{
+ struct virtio_snd *snd = vqueue->vdev->priv;
+ struct virtio_snd_queue *queue = virtsnd_control_queue(snd);
+ struct virtio_snd_msg *msg;
+ u32 length;
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ do {
+ virtqueue_disable_cb(vqueue);
+ while ((msg = virtqueue_get_buf(vqueue, &length)))
+ virtsnd_ctl_msg_complete(msg);
+ if (unlikely(virtqueue_is_broken(vqueue)))
+ break;
+ } while (!virtqueue_enable_cb(vqueue));
+ spin_unlock_irqrestore(&queue->lock, flags);
+}
diff --git a/sound/virtio/virtio_ctl_msg.h b/sound/virtio/virtio_ctl_msg.h
new file mode 100644
index 0000000000..7f4db044f2
--- /dev/null
+++ b/sound/virtio/virtio_ctl_msg.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#ifndef VIRTIO_SND_MSG_H
+#define VIRTIO_SND_MSG_H
+
+#include <linux/atomic.h>
+#include <linux/virtio.h>
+
+struct virtio_snd;
+struct virtio_snd_msg;
+
+void virtsnd_ctl_msg_ref(struct virtio_snd_msg *msg);
+
+void virtsnd_ctl_msg_unref(struct virtio_snd_msg *msg);
+
+void *virtsnd_ctl_msg_request(struct virtio_snd_msg *msg);
+
+void *virtsnd_ctl_msg_response(struct virtio_snd_msg *msg);
+
+struct virtio_snd_msg *virtsnd_ctl_msg_alloc(size_t request_size,
+ size_t response_size, gfp_t gfp);
+
+int virtsnd_ctl_msg_send(struct virtio_snd *snd, struct virtio_snd_msg *msg,
+ struct scatterlist *out_sgs,
+ struct scatterlist *in_sgs, bool nowait);
+
+/**
+ * virtsnd_ctl_msg_send_sync() - Simplified sending of synchronous message.
+ * @snd: VirtIO sound device.
+ * @msg: Control message.
+ *
+ * After returning from this function, the message will be deleted. If message
+ * content is still needed, the caller must additionally to
+ * virtsnd_ctl_msg_ref/unref() it.
+ *
+ * The msg_timeout_ms module parameter defines the message completion timeout.
+ * If the message is not completed within this time, the function will return an
+ * error.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ *
+ * The return value is a message status code (VIRTIO_SND_S_XXX) converted to an
+ * appropriate -errno value.
+ */
+static inline int virtsnd_ctl_msg_send_sync(struct virtio_snd *snd,
+ struct virtio_snd_msg *msg)
+{
+ return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, false);
+}
+
+/**
+ * virtsnd_ctl_msg_send_async() - Simplified sending of asynchronous message.
+ * @snd: VirtIO sound device.
+ * @msg: Control message.
+ *
+ * Context: Any context.
+ * Return: 0 on success, -errno on failure.
+ */
+static inline int virtsnd_ctl_msg_send_async(struct virtio_snd *snd,
+ struct virtio_snd_msg *msg)
+{
+ return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, true);
+}
+
+void virtsnd_ctl_msg_cancel_all(struct virtio_snd *snd);
+
+void virtsnd_ctl_msg_complete(struct virtio_snd_msg *msg);
+
+int virtsnd_ctl_query_info(struct virtio_snd *snd, int command, int start_id,
+ int count, size_t size, void *info);
+
+void virtsnd_ctl_notify_cb(struct virtqueue *vqueue);
+
+#endif /* VIRTIO_SND_MSG_H */
diff --git a/sound/virtio/virtio_jack.c b/sound/virtio/virtio_jack.c
new file mode 100644
index 0000000000..c69f1dcdcc
--- /dev/null
+++ b/sound/virtio/virtio_jack.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#include <linux/virtio_config.h>
+#include <sound/jack.h>
+#include <sound/hda_verbs.h>
+
+#include "virtio_card.h"
+
+/**
+ * DOC: Implementation Status
+ *
+ * At the moment jacks have a simple implementation and can only be used to
+ * receive notifications about a plugged in/out device.
+ *
+ * VIRTIO_SND_R_JACK_REMAP
+ * is not supported
+ */
+
+/**
+ * struct virtio_jack - VirtIO jack.
+ * @jack: Kernel jack control.
+ * @nid: Functional group node identifier.
+ * @features: Jack virtio feature bit map (1 << VIRTIO_SND_JACK_F_XXX).
+ * @defconf: Pin default configuration value.
+ * @caps: Pin capabilities value.
+ * @connected: Current jack connection status.
+ * @type: Kernel jack type (SND_JACK_XXX).
+ */
+struct virtio_jack {
+ struct snd_jack *jack;
+ u32 nid;
+ u32 features;
+ u32 defconf;
+ u32 caps;
+ bool connected;
+ int type;
+};
+
+/**
+ * virtsnd_jack_get_label() - Get the name string for the jack.
+ * @vjack: VirtIO jack.
+ *
+ * Returns the jack name based on the default pin configuration value (see HDA
+ * specification).
+ *
+ * Context: Any context.
+ * Return: Name string.
+ */
+static const char *virtsnd_jack_get_label(struct virtio_jack *vjack)
+{
+ unsigned int defconf = vjack->defconf;
+ unsigned int device =
+ (defconf & AC_DEFCFG_DEVICE) >> AC_DEFCFG_DEVICE_SHIFT;
+ unsigned int location =
+ (defconf & AC_DEFCFG_LOCATION) >> AC_DEFCFG_LOCATION_SHIFT;
+
+ switch (device) {
+ case AC_JACK_LINE_OUT:
+ return "Line Out";
+ case AC_JACK_SPEAKER:
+ return "Speaker";
+ case AC_JACK_HP_OUT:
+ return "Headphone";
+ case AC_JACK_CD:
+ return "CD";
+ case AC_JACK_SPDIF_OUT:
+ case AC_JACK_DIG_OTHER_OUT:
+ if (location == AC_JACK_LOC_HDMI)
+ return "HDMI Out";
+ else
+ return "SPDIF Out";
+ case AC_JACK_LINE_IN:
+ return "Line";
+ case AC_JACK_AUX:
+ return "Aux";
+ case AC_JACK_MIC_IN:
+ return "Mic";
+ case AC_JACK_SPDIF_IN:
+ return "SPDIF In";
+ case AC_JACK_DIG_OTHER_IN:
+ return "Digital In";
+ default:
+ return "Misc";
+ }
+}
+
+/**
+ * virtsnd_jack_get_type() - Get the type for the jack.
+ * @vjack: VirtIO jack.
+ *
+ * Returns the jack type based on the default pin configuration value (see HDA
+ * specification).
+ *
+ * Context: Any context.
+ * Return: SND_JACK_XXX value.
+ */
+static int virtsnd_jack_get_type(struct virtio_jack *vjack)
+{
+ unsigned int defconf = vjack->defconf;
+ unsigned int device =
+ (defconf & AC_DEFCFG_DEVICE) >> AC_DEFCFG_DEVICE_SHIFT;
+
+ switch (device) {
+ case AC_JACK_LINE_OUT:
+ case AC_JACK_SPEAKER:
+ return SND_JACK_LINEOUT;
+ case AC_JACK_HP_OUT:
+ return SND_JACK_HEADPHONE;
+ case AC_JACK_SPDIF_OUT:
+ case AC_JACK_DIG_OTHER_OUT:
+ return SND_JACK_AVOUT;
+ case AC_JACK_MIC_IN:
+ return SND_JACK_MICROPHONE;
+ default:
+ return SND_JACK_LINEIN;
+ }
+}
+
+/**
+ * virtsnd_jack_parse_cfg() - Parse the jack 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_jack_parse_cfg(struct virtio_snd *snd)
+{
+ struct virtio_device *vdev = snd->vdev;
+ struct virtio_snd_jack_info *info;
+ u32 i;
+ int rc;
+
+ virtio_cread_le(vdev, struct virtio_snd_config, jacks, &snd->njacks);
+ if (!snd->njacks)
+ return 0;
+
+ snd->jacks = devm_kcalloc(&vdev->dev, snd->njacks, sizeof(*snd->jacks),
+ GFP_KERNEL);
+ if (!snd->jacks)
+ return -ENOMEM;
+
+ info = kcalloc(snd->njacks, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_JACK_INFO, 0, snd->njacks,
+ sizeof(*info), info);
+ if (rc)
+ goto on_exit;
+
+ for (i = 0; i < snd->njacks; ++i) {
+ struct virtio_jack *vjack = &snd->jacks[i];
+
+ vjack->nid = le32_to_cpu(info[i].hdr.hda_fn_nid);
+ vjack->features = le32_to_cpu(info[i].features);
+ vjack->defconf = le32_to_cpu(info[i].hda_reg_defconf);
+ vjack->caps = le32_to_cpu(info[i].hda_reg_caps);
+ vjack->connected = info[i].connected;
+ }
+
+on_exit:
+ kfree(info);
+
+ return rc;
+}
+
+/**
+ * virtsnd_jack_build_devs() - Build ALSA controls for jacks.
+ * @snd: VirtIO sound device.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_jack_build_devs(struct virtio_snd *snd)
+{
+ u32 i;
+ int rc;
+
+ for (i = 0; i < snd->njacks; ++i) {
+ struct virtio_jack *vjack = &snd->jacks[i];
+
+ vjack->type = virtsnd_jack_get_type(vjack);
+
+ rc = snd_jack_new(snd->card, virtsnd_jack_get_label(vjack),
+ vjack->type, &vjack->jack, true, true);
+ if (rc)
+ return rc;
+
+ if (vjack->jack)
+ vjack->jack->private_data = vjack;
+
+ snd_jack_report(vjack->jack,
+ vjack->connected ? vjack->type : 0);
+ }
+
+ return 0;
+}
+
+/**
+ * virtsnd_jack_event() - Handle the jack event notification.
+ * @snd: VirtIO sound device.
+ * @event: VirtIO sound event.
+ *
+ * Context: Interrupt context.
+ */
+void virtsnd_jack_event(struct virtio_snd *snd, struct virtio_snd_event *event)
+{
+ u32 jack_id = le32_to_cpu(event->data);
+ struct virtio_jack *vjack;
+
+ if (jack_id >= snd->njacks)
+ return;
+
+ vjack = &snd->jacks[jack_id];
+
+ switch (le32_to_cpu(event->hdr.code)) {
+ case VIRTIO_SND_EVT_JACK_CONNECTED:
+ vjack->connected = true;
+ break;
+ case VIRTIO_SND_EVT_JACK_DISCONNECTED:
+ vjack->connected = false;
+ break;
+ default:
+ return;
+ }
+
+ snd_jack_report(vjack->jack, vjack->connected ? vjack->type : 0);
+}
diff --git a/sound/virtio/virtio_pcm.c b/sound/virtio/virtio_pcm.c
new file mode 100644
index 0000000000..c10d91fff2
--- /dev/null
+++ b/sound/virtio/virtio_pcm.c
@@ -0,0 +1,513 @@
+// 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);
+ init_waitqueue_head(&vss->msg_empty);
+ spin_lock_init(&vss->lock);
+
+ 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_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;
+ }
+}
diff --git a/sound/virtio/virtio_pcm.h b/sound/virtio/virtio_pcm.h
new file mode 100644
index 0000000000..062eb8e8f2
--- /dev/null
+++ b/sound/virtio/virtio_pcm.h
@@ -0,0 +1,124 @@
+/* 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.
+ * @lock: Spinlock that protects fields shared by interrupt handlers and
+ * substream operators.
+ * @buffer_bytes: Current buffer size in bytes.
+ * @hw_ptr: Substream hardware pointer value in bytes [0 ... buffer_bytes).
+ * @xfer_enabled: Data transfer state (0 - off, 1 - on).
+ * @xfer_xrun: Data underflow/overflow state (0 - no xrun, 1 - xrun).
+ * @stopped: True if the substream is stopped and must be released on the device
+ * side.
+ * @suspended: True if the substream is suspended and must be reconfigured on
+ * the device side at resume.
+ * @msgs: Allocated I/O messages.
+ * @nmsgs: Number of allocated I/O messages.
+ * @msg_last_enqueued: Index of the last I/O message added to the virtqueue.
+ * @msg_count: Number of pending I/O messages in the virtqueue.
+ * @msg_empty: Notify when msg_count is zero.
+ */
+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;
+ spinlock_t lock;
+ size_t buffer_bytes;
+ size_t hw_ptr;
+ bool xfer_enabled;
+ bool xfer_xrun;
+ bool stopped;
+ bool suspended;
+ struct virtio_pcm_msg **msgs;
+ unsigned int nmsgs;
+ int msg_last_enqueued;
+ unsigned int msg_count;
+ wait_queue_head_t msg_empty;
+};
+
+/**
+ * struct virtio_pcm_stream - VirtIO PCM stream.
+ * @substreams: VirtIO substreams belonging to the stream.
+ * @nsubstreams: Number of substreams.
+ * @chmaps: Kernel channel maps belonging to the stream.
+ * @nchmaps: Number of channel maps.
+ */
+struct virtio_pcm_stream {
+ struct virtio_pcm_substream **substreams;
+ u32 nsubstreams;
+ struct snd_pcm_chmap_elem *chmaps;
+ u32 nchmaps;
+};
+
+/**
+ * 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];
+};
+
+extern const struct snd_pcm_ops virtsnd_pcm_ops;
+
+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);
+
+void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event);
+
+void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue);
+
+void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue);
+
+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);
+
+struct virtio_snd_msg *
+virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss,
+ unsigned int command, gfp_t gfp);
+
+int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss,
+ unsigned int periods, unsigned int period_bytes);
+
+void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss);
+
+int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss);
+
+unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss);
+
+#endif /* VIRTIO_SND_PCM_H */
diff --git a/sound/virtio/virtio_pcm_msg.c b/sound/virtio/virtio_pcm_msg.c
new file mode 100644
index 0000000000..aca2dc1989
--- /dev/null
+++ b/sound/virtio/virtio_pcm_msg.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#include <sound/pcm_params.h>
+
+#include "virtio_card.h"
+
+/**
+ * struct virtio_pcm_msg - VirtIO I/O message.
+ * @substream: VirtIO PCM substream.
+ * @xfer: Request header payload.
+ * @status: Response header payload.
+ * @length: Data length in bytes.
+ * @sgs: Payload scatter-gather table.
+ */
+struct virtio_pcm_msg {
+ struct virtio_pcm_substream *substream;
+ struct virtio_snd_pcm_xfer xfer;
+ struct virtio_snd_pcm_status status;
+ size_t length;
+ struct scatterlist sgs[];
+};
+
+/**
+ * enum pcm_msg_sg_index - Index values for the virtio_pcm_msg->sgs field in
+ * an I/O message.
+ * @PCM_MSG_SG_XFER: Element containing a virtio_snd_pcm_xfer structure.
+ * @PCM_MSG_SG_STATUS: Element containing a virtio_snd_pcm_status structure.
+ * @PCM_MSG_SG_DATA: The first element containing a data buffer.
+ */
+enum pcm_msg_sg_index {
+ PCM_MSG_SG_XFER = 0,
+ PCM_MSG_SG_STATUS,
+ PCM_MSG_SG_DATA
+};
+
+/**
+ * virtsnd_pcm_sg_num() - Count the number of sg-elements required to represent
+ * vmalloc'ed buffer.
+ * @data: Pointer to vmalloc'ed buffer.
+ * @length: Buffer size.
+ *
+ * Context: Any context.
+ * Return: Number of physically contiguous parts in the @data.
+ */
+static int virtsnd_pcm_sg_num(u8 *data, unsigned int length)
+{
+ phys_addr_t sg_address;
+ unsigned int sg_length;
+ int num = 0;
+
+ while (length) {
+ struct page *pg = vmalloc_to_page(data);
+ phys_addr_t pg_address = page_to_phys(pg);
+ size_t pg_length;
+
+ pg_length = PAGE_SIZE - offset_in_page(data);
+ if (pg_length > length)
+ pg_length = length;
+
+ if (!num || sg_address + sg_length != pg_address) {
+ sg_address = pg_address;
+ sg_length = pg_length;
+ num++;
+ } else {
+ sg_length += pg_length;
+ }
+
+ data += pg_length;
+ length -= pg_length;
+ }
+
+ return num;
+}
+
+/**
+ * virtsnd_pcm_sg_from() - Build sg-list from vmalloc'ed buffer.
+ * @sgs: Preallocated sg-list to populate.
+ * @nsgs: The maximum number of elements in the @sgs.
+ * @data: Pointer to vmalloc'ed buffer.
+ * @length: Buffer size.
+ *
+ * Splits the buffer into physically contiguous parts and makes an sg-list of
+ * such parts.
+ *
+ * Context: Any context.
+ */
+static void virtsnd_pcm_sg_from(struct scatterlist *sgs, int nsgs, u8 *data,
+ unsigned int length)
+{
+ int idx = -1;
+
+ while (length) {
+ struct page *pg = vmalloc_to_page(data);
+ size_t pg_length;
+
+ pg_length = PAGE_SIZE - offset_in_page(data);
+ if (pg_length > length)
+ pg_length = length;
+
+ if (idx == -1 ||
+ sg_phys(&sgs[idx]) + sgs[idx].length != page_to_phys(pg)) {
+ if (idx + 1 == nsgs)
+ break;
+ sg_set_page(&sgs[++idx], pg, pg_length,
+ offset_in_page(data));
+ } else {
+ sgs[idx].length += pg_length;
+ }
+
+ data += pg_length;
+ length -= pg_length;
+ }
+
+ sg_mark_end(&sgs[idx]);
+}
+
+/**
+ * virtsnd_pcm_msg_alloc() - Allocate I/O messages.
+ * @vss: VirtIO PCM substream.
+ * @periods: Current number of periods.
+ * @period_bytes: Current period size in bytes.
+ *
+ * The function slices the buffer into @periods parts (each with the size of
+ * @period_bytes), and creates @periods corresponding I/O messages.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -ENOMEM on failure.
+ */
+int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss,
+ unsigned int periods, unsigned int period_bytes)
+{
+ struct snd_pcm_runtime *runtime = vss->substream->runtime;
+ unsigned int i;
+
+ vss->msgs = kcalloc(periods, sizeof(*vss->msgs), GFP_KERNEL);
+ if (!vss->msgs)
+ return -ENOMEM;
+
+ vss->nmsgs = periods;
+
+ for (i = 0; i < periods; ++i) {
+ u8 *data = runtime->dma_area + period_bytes * i;
+ int sg_num = virtsnd_pcm_sg_num(data, period_bytes);
+ struct virtio_pcm_msg *msg;
+
+ msg = kzalloc(struct_size(msg, sgs, sg_num + 2), GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ msg->substream = vss;
+ sg_init_one(&msg->sgs[PCM_MSG_SG_XFER], &msg->xfer,
+ sizeof(msg->xfer));
+ sg_init_one(&msg->sgs[PCM_MSG_SG_STATUS], &msg->status,
+ sizeof(msg->status));
+ msg->length = period_bytes;
+ virtsnd_pcm_sg_from(&msg->sgs[PCM_MSG_SG_DATA], sg_num, data,
+ period_bytes);
+
+ vss->msgs[i] = msg;
+ }
+
+ return 0;
+}
+
+/**
+ * virtsnd_pcm_msg_free() - Free all allocated I/O messages.
+ * @vss: VirtIO PCM substream.
+ *
+ * Context: Any context.
+ */
+void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss)
+{
+ unsigned int i;
+
+ for (i = 0; vss->msgs && i < vss->nmsgs; ++i)
+ kfree(vss->msgs[i]);
+ kfree(vss->msgs);
+
+ vss->msgs = NULL;
+ vss->nmsgs = 0;
+}
+
+/**
+ * virtsnd_pcm_msg_send() - Send asynchronous I/O messages.
+ * @vss: VirtIO PCM substream.
+ *
+ * All messages are organized in an ordered circular list. Each time the
+ * function is called, all currently non-enqueued messages are added to the
+ * virtqueue. For this, the function keeps track of two values:
+ *
+ * msg_last_enqueued = index of the last enqueued message,
+ * msg_count = # of pending messages in the virtqueue.
+ *
+ * Context: Any context. Expects the tx/rx queue and the VirtIO substream
+ * spinlocks to be held by caller.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss)
+{
+ struct snd_pcm_runtime *runtime = vss->substream->runtime;
+ struct virtio_snd *snd = vss->snd;
+ struct virtio_device *vdev = snd->vdev;
+ struct virtqueue *vqueue = virtsnd_pcm_queue(vss)->vqueue;
+ int i;
+ int n;
+ bool notify = false;
+
+ i = (vss->msg_last_enqueued + 1) % runtime->periods;
+ n = runtime->periods - vss->msg_count;
+
+ for (; n; --n, i = (i + 1) % runtime->periods) {
+ struct virtio_pcm_msg *msg = vss->msgs[i];
+ struct scatterlist *psgs[] = {
+ &msg->sgs[PCM_MSG_SG_XFER],
+ &msg->sgs[PCM_MSG_SG_DATA],
+ &msg->sgs[PCM_MSG_SG_STATUS]
+ };
+ int rc;
+
+ msg->xfer.stream_id = cpu_to_le32(vss->sid);
+ memset(&msg->status, 0, sizeof(msg->status));
+
+ if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ rc = virtqueue_add_sgs(vqueue, psgs, 2, 1, msg,
+ GFP_ATOMIC);
+ else
+ rc = virtqueue_add_sgs(vqueue, psgs, 1, 2, msg,
+ GFP_ATOMIC);
+
+ if (rc) {
+ dev_err(&vdev->dev,
+ "SID %u: failed to send I/O message\n",
+ vss->sid);
+ return rc;
+ }
+
+ vss->msg_last_enqueued = i;
+ vss->msg_count++;
+ }
+
+ if (!(vss->features & (1U << VIRTIO_SND_PCM_F_MSG_POLLING)))
+ notify = virtqueue_kick_prepare(vqueue);
+
+ if (notify)
+ virtqueue_notify(vqueue);
+
+ return 0;
+}
+
+/**
+ * virtsnd_pcm_msg_pending_num() - Returns the number of pending I/O messages.
+ * @vss: VirtIO substream.
+ *
+ * Context: Any context.
+ * Return: Number of messages.
+ */
+unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss)
+{
+ unsigned int num;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vss->lock, flags);
+ num = vss->msg_count;
+ spin_unlock_irqrestore(&vss->lock, flags);
+
+ return num;
+}
+
+/**
+ * virtsnd_pcm_msg_complete() - Complete an I/O message.
+ * @msg: I/O message.
+ * @written_bytes: Number of bytes written to the message.
+ *
+ * Completion of the message means the elapsed period. If transmission is
+ * allowed, then each completed message is immediately placed back at the end
+ * of the queue.
+ *
+ * For the playback substream, @written_bytes is equal to sizeof(msg->status).
+ *
+ * For the capture substream, @written_bytes is equal to sizeof(msg->status)
+ * plus the number of captured bytes.
+ *
+ * Context: Interrupt context. Takes and releases the VirtIO substream spinlock.
+ */
+static void virtsnd_pcm_msg_complete(struct virtio_pcm_msg *msg,
+ size_t written_bytes)
+{
+ struct virtio_pcm_substream *vss = msg->substream;
+
+ /*
+ * hw_ptr always indicates the buffer position of the first I/O message
+ * in the virtqueue. Therefore, on each completion of an I/O message,
+ * the hw_ptr value is unconditionally advanced.
+ */
+ spin_lock(&vss->lock);
+ /*
+ * If the capture substream returned an incorrect status, then just
+ * increase the hw_ptr by the message size.
+ */
+ if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK ||
+ written_bytes <= sizeof(msg->status))
+ vss->hw_ptr += msg->length;
+ else
+ vss->hw_ptr += written_bytes - sizeof(msg->status);
+
+ if (vss->hw_ptr >= vss->buffer_bytes)
+ vss->hw_ptr -= vss->buffer_bytes;
+
+ vss->xfer_xrun = false;
+ vss->msg_count--;
+
+ if (vss->xfer_enabled) {
+ struct snd_pcm_runtime *runtime = vss->substream->runtime;
+
+ runtime->delay =
+ bytes_to_frames(runtime,
+ le32_to_cpu(msg->status.latency_bytes));
+
+ schedule_work(&vss->elapsed_period);
+
+ virtsnd_pcm_msg_send(vss);
+ } else if (!vss->msg_count) {
+ wake_up_all(&vss->msg_empty);
+ }
+ spin_unlock(&vss->lock);
+}
+
+/**
+ * virtsnd_pcm_notify_cb() - Process all completed I/O messages.
+ * @queue: Underlying tx/rx virtqueue.
+ *
+ * Context: Interrupt context. Takes and releases the tx/rx queue spinlock.
+ */
+static inline void virtsnd_pcm_notify_cb(struct virtio_snd_queue *queue)
+{
+ struct virtio_pcm_msg *msg;
+ u32 written_bytes;
+ unsigned long flags;
+
+ spin_lock_irqsave(&queue->lock, flags);
+ do {
+ virtqueue_disable_cb(queue->vqueue);
+ while ((msg = virtqueue_get_buf(queue->vqueue, &written_bytes)))
+ virtsnd_pcm_msg_complete(msg, written_bytes);
+ if (unlikely(virtqueue_is_broken(queue->vqueue)))
+ break;
+ } while (!virtqueue_enable_cb(queue->vqueue));
+ spin_unlock_irqrestore(&queue->lock, flags);
+}
+
+/**
+ * virtsnd_pcm_tx_notify_cb() - Process all completed TX messages.
+ * @vqueue: Underlying tx virtqueue.
+ *
+ * Context: Interrupt context.
+ */
+void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue)
+{
+ struct virtio_snd *snd = vqueue->vdev->priv;
+
+ virtsnd_pcm_notify_cb(virtsnd_tx_queue(snd));
+}
+
+/**
+ * virtsnd_pcm_rx_notify_cb() - Process all completed RX messages.
+ * @vqueue: Underlying rx virtqueue.
+ *
+ * Context: Interrupt context.
+ */
+void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue)
+{
+ struct virtio_snd *snd = vqueue->vdev->priv;
+
+ virtsnd_pcm_notify_cb(virtsnd_rx_queue(snd));
+}
+
+/**
+ * virtsnd_pcm_ctl_msg_alloc() - Allocate and initialize the PCM device control
+ * message for the specified substream.
+ * @vss: VirtIO PCM substream.
+ * @command: Control request code (VIRTIO_SND_R_PCM_XXX).
+ * @gfp: Kernel flags for memory allocation.
+ *
+ * Context: Any context. May sleep if @gfp flags permit.
+ * Return: Allocated message on success, NULL on failure.
+ */
+struct virtio_snd_msg *
+virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss,
+ unsigned int command, gfp_t gfp)
+{
+ size_t request_size = sizeof(struct virtio_snd_pcm_hdr);
+ size_t response_size = sizeof(struct virtio_snd_hdr);
+ struct virtio_snd_msg *msg;
+
+ switch (command) {
+ case VIRTIO_SND_R_PCM_SET_PARAMS:
+ request_size = sizeof(struct virtio_snd_pcm_set_params);
+ break;
+ }
+
+ msg = virtsnd_ctl_msg_alloc(request_size, response_size, gfp);
+ if (msg) {
+ struct virtio_snd_pcm_hdr *hdr = virtsnd_ctl_msg_request(msg);
+
+ hdr->hdr.code = cpu_to_le32(command);
+ hdr->stream_id = cpu_to_le32(vss->sid);
+ }
+
+ return msg;
+}
diff --git a/sound/virtio/virtio_pcm_ops.c b/sound/virtio/virtio_pcm_ops.c
new file mode 100644
index 0000000000..f8bfb87624
--- /dev/null
+++ b/sound/virtio/virtio_pcm_ops.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * virtio-snd: Virtio sound device
+ * Copyright (C) 2021 OpenSynergy GmbH
+ */
+#include <sound/pcm_params.h>
+
+#include "virtio_card.h"
+
+/*
+ * I/O messages lifetime
+ * ---------------------
+ *
+ * Allocation:
+ * Messages are initially allocated in the ops->hw_params() after the size and
+ * number of periods have been successfully negotiated.
+ *
+ * Freeing:
+ * Messages can be safely freed after the queue has been successfully flushed
+ * (RELEASE command in the ops->sync_stop()) and the ops->hw_free() has been
+ * called.
+ *
+ * When the substream stops, the ops->sync_stop() waits until the device has
+ * completed all pending messages. This wait can be interrupted either by a
+ * signal or due to a timeout. In this case, the device can still access
+ * messages even after calling ops->hw_free(). It can also issue an interrupt,
+ * and the interrupt handler will also try to access message structures.
+ *
+ * Therefore, freeing of already allocated messages occurs:
+ *
+ * - in ops->hw_params(), if this operator was called several times in a row,
+ * or if ops->hw_free() failed to free messages previously;
+ *
+ * - in ops->hw_free(), if the queue has been successfully flushed;
+ *
+ * - in dev->release().
+ */
+
+/* Map for converting ALSA format to VirtIO format. */
+struct virtsnd_a2v_format {
+ snd_pcm_format_t alsa_bit;
+ unsigned int vio_bit;
+};
+
+static const struct virtsnd_a2v_format g_a2v_format_map[] = {
+ { SNDRV_PCM_FORMAT_IMA_ADPCM, VIRTIO_SND_PCM_FMT_IMA_ADPCM },
+ { SNDRV_PCM_FORMAT_MU_LAW, VIRTIO_SND_PCM_FMT_MU_LAW },
+ { SNDRV_PCM_FORMAT_A_LAW, VIRTIO_SND_PCM_FMT_A_LAW },
+ { SNDRV_PCM_FORMAT_S8, VIRTIO_SND_PCM_FMT_S8 },
+ { SNDRV_PCM_FORMAT_U8, VIRTIO_SND_PCM_FMT_U8 },
+ { SNDRV_PCM_FORMAT_S16_LE, VIRTIO_SND_PCM_FMT_S16 },
+ { SNDRV_PCM_FORMAT_U16_LE, VIRTIO_SND_PCM_FMT_U16 },
+ { SNDRV_PCM_FORMAT_S18_3LE, VIRTIO_SND_PCM_FMT_S18_3 },
+ { SNDRV_PCM_FORMAT_U18_3LE, VIRTIO_SND_PCM_FMT_U18_3 },
+ { SNDRV_PCM_FORMAT_S20_3LE, VIRTIO_SND_PCM_FMT_S20_3 },
+ { SNDRV_PCM_FORMAT_U20_3LE, VIRTIO_SND_PCM_FMT_U20_3 },
+ { SNDRV_PCM_FORMAT_S24_3LE, VIRTIO_SND_PCM_FMT_S24_3 },
+ { SNDRV_PCM_FORMAT_U24_3LE, VIRTIO_SND_PCM_FMT_U24_3 },
+ { SNDRV_PCM_FORMAT_S20_LE, VIRTIO_SND_PCM_FMT_S20 },
+ { SNDRV_PCM_FORMAT_U20_LE, VIRTIO_SND_PCM_FMT_U20 },
+ { SNDRV_PCM_FORMAT_S24_LE, VIRTIO_SND_PCM_FMT_S24 },
+ { SNDRV_PCM_FORMAT_U24_LE, VIRTIO_SND_PCM_FMT_U24 },
+ { SNDRV_PCM_FORMAT_S32_LE, VIRTIO_SND_PCM_FMT_S32 },
+ { SNDRV_PCM_FORMAT_U32_LE, VIRTIO_SND_PCM_FMT_U32 },
+ { SNDRV_PCM_FORMAT_FLOAT_LE, VIRTIO_SND_PCM_FMT_FLOAT },
+ { SNDRV_PCM_FORMAT_FLOAT64_LE, VIRTIO_SND_PCM_FMT_FLOAT64 },
+ { SNDRV_PCM_FORMAT_DSD_U8, VIRTIO_SND_PCM_FMT_DSD_U8 },
+ { SNDRV_PCM_FORMAT_DSD_U16_LE, VIRTIO_SND_PCM_FMT_DSD_U16 },
+ { SNDRV_PCM_FORMAT_DSD_U32_LE, VIRTIO_SND_PCM_FMT_DSD_U32 },
+ { SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE,
+ VIRTIO_SND_PCM_FMT_IEC958_SUBFRAME }
+};
+
+/* Map for converting ALSA frame rate to VirtIO frame rate. */
+struct virtsnd_a2v_rate {
+ unsigned int rate;
+ unsigned int vio_bit;
+};
+
+static const struct virtsnd_a2v_rate g_a2v_rate_map[] = {
+ { 5512, VIRTIO_SND_PCM_RATE_5512 },
+ { 8000, VIRTIO_SND_PCM_RATE_8000 },
+ { 11025, VIRTIO_SND_PCM_RATE_11025 },
+ { 16000, VIRTIO_SND_PCM_RATE_16000 },
+ { 22050, VIRTIO_SND_PCM_RATE_22050 },
+ { 32000, VIRTIO_SND_PCM_RATE_32000 },
+ { 44100, VIRTIO_SND_PCM_RATE_44100 },
+ { 48000, VIRTIO_SND_PCM_RATE_48000 },
+ { 64000, VIRTIO_SND_PCM_RATE_64000 },
+ { 88200, VIRTIO_SND_PCM_RATE_88200 },
+ { 96000, VIRTIO_SND_PCM_RATE_96000 },
+ { 176400, VIRTIO_SND_PCM_RATE_176400 },
+ { 192000, VIRTIO_SND_PCM_RATE_192000 }
+};
+
+static int virtsnd_pcm_sync_stop(struct snd_pcm_substream *substream);
+
+/**
+ * virtsnd_pcm_open() - Open the PCM substream.
+ * @substream: Kernel ALSA substream.
+ *
+ * Context: Process context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct virtio_pcm *vpcm = snd_pcm_substream_chip(substream);
+ struct virtio_pcm_stream *vs = &vpcm->streams[substream->stream];
+ struct virtio_pcm_substream *vss = vs->substreams[substream->number];
+
+ substream->runtime->hw = vss->hw;
+ substream->private_data = vss;
+
+ snd_pcm_hw_constraint_integer(substream->runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+
+ vss->stopped = !!virtsnd_pcm_msg_pending_num(vss);
+ vss->suspended = false;
+
+ /*
+ * If the substream has already been used, then the I/O queue may be in
+ * an invalid state. Just in case, we do a check and try to return the
+ * queue to its original state, if necessary.
+ */
+ return virtsnd_pcm_sync_stop(substream);
+}
+
+/**
+ * virtsnd_pcm_close() - Close the PCM substream.
+ * @substream: Kernel ALSA substream.
+ *
+ * Context: Process context.
+ * Return: 0.
+ */
+static int virtsnd_pcm_close(struct snd_pcm_substream *substream)
+{
+ return 0;
+}
+
+/**
+ * virtsnd_pcm_dev_set_params() - Set the parameters of the PCM substream on
+ * the device side.
+ * @vss: VirtIO PCM substream.
+ * @buffer_bytes: Size of the hardware buffer.
+ * @period_bytes: Size of the hardware period.
+ * @channels: Selected number of channels.
+ * @format: Selected sample format (SNDRV_PCM_FORMAT_XXX).
+ * @rate: Selected frame rate.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_dev_set_params(struct virtio_pcm_substream *vss,
+ unsigned int buffer_bytes,
+ unsigned int period_bytes,
+ unsigned int channels,
+ snd_pcm_format_t format,
+ unsigned int rate)
+{
+ struct virtio_snd_msg *msg;
+ struct virtio_snd_pcm_set_params *request;
+ unsigned int i;
+ int vformat = -1;
+ int vrate = -1;
+
+ for (i = 0; i < ARRAY_SIZE(g_a2v_format_map); ++i)
+ if (g_a2v_format_map[i].alsa_bit == format) {
+ vformat = g_a2v_format_map[i].vio_bit;
+
+ break;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(g_a2v_rate_map); ++i)
+ if (g_a2v_rate_map[i].rate == rate) {
+ vrate = g_a2v_rate_map[i].vio_bit;
+
+ break;
+ }
+
+ if (vformat == -1 || vrate == -1)
+ return -EINVAL;
+
+ msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_SET_PARAMS,
+ GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ request = virtsnd_ctl_msg_request(msg);
+ request->buffer_bytes = cpu_to_le32(buffer_bytes);
+ request->period_bytes = cpu_to_le32(period_bytes);
+ request->channels = channels;
+ request->format = vformat;
+ request->rate = vrate;
+
+ if (vss->features & (1U << VIRTIO_SND_PCM_F_MSG_POLLING))
+ request->features |=
+ cpu_to_le32(1U << VIRTIO_SND_PCM_F_MSG_POLLING);
+
+ if (vss->features & (1U << VIRTIO_SND_PCM_F_EVT_XRUNS))
+ request->features |=
+ cpu_to_le32(1U << VIRTIO_SND_PCM_F_EVT_XRUNS);
+
+ return virtsnd_ctl_msg_send_sync(vss->snd, msg);
+}
+
+/**
+ * virtsnd_pcm_hw_params() - Set the parameters of the PCM substream.
+ * @substream: Kernel ALSA substream.
+ * @hw_params: Hardware parameters.
+ *
+ * Context: Process context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+ struct virtio_device *vdev = vss->snd->vdev;
+ int rc;
+
+ if (virtsnd_pcm_msg_pending_num(vss)) {
+ dev_err(&vdev->dev, "SID %u: invalid I/O queue state\n",
+ vss->sid);
+ return -EBADFD;
+ }
+
+ rc = virtsnd_pcm_dev_set_params(vss, params_buffer_bytes(hw_params),
+ params_period_bytes(hw_params),
+ params_channels(hw_params),
+ params_format(hw_params),
+ params_rate(hw_params));
+ if (rc)
+ return rc;
+
+ /*
+ * Free previously allocated messages if ops->hw_params() is called
+ * several times in a row, or if ops->hw_free() failed to free messages.
+ */
+ virtsnd_pcm_msg_free(vss);
+
+ return virtsnd_pcm_msg_alloc(vss, params_periods(hw_params),
+ params_period_bytes(hw_params));
+}
+
+/**
+ * virtsnd_pcm_hw_free() - Reset the parameters of the PCM substream.
+ * @substream: Kernel ALSA substream.
+ *
+ * Context: Process context.
+ * Return: 0
+ */
+static int virtsnd_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+
+ /* If the queue is flushed, we can safely free the messages here. */
+ if (!virtsnd_pcm_msg_pending_num(vss))
+ virtsnd_pcm_msg_free(vss);
+
+ return 0;
+}
+
+/**
+ * virtsnd_pcm_prepare() - Prepare the PCM substream.
+ * @substream: Kernel ALSA substream.
+ *
+ * Context: Process context.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+ struct virtio_device *vdev = vss->snd->vdev;
+ struct virtio_snd_msg *msg;
+
+ if (!vss->suspended) {
+ if (virtsnd_pcm_msg_pending_num(vss)) {
+ dev_err(&vdev->dev, "SID %u: invalid I/O queue state\n",
+ vss->sid);
+ return -EBADFD;
+ }
+
+ vss->buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+ vss->hw_ptr = 0;
+ vss->msg_last_enqueued = -1;
+ } else {
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned int buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+ unsigned int period_bytes = snd_pcm_lib_period_bytes(substream);
+ int rc;
+
+ rc = virtsnd_pcm_dev_set_params(vss, buffer_bytes, period_bytes,
+ runtime->channels,
+ runtime->format, runtime->rate);
+ if (rc)
+ return rc;
+ }
+
+ vss->xfer_xrun = false;
+ vss->suspended = false;
+ vss->msg_count = 0;
+
+ msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_PREPARE,
+ GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ return virtsnd_ctl_msg_send_sync(vss->snd, msg);
+}
+
+/**
+ * virtsnd_pcm_trigger() - Process command for the PCM substream.
+ * @substream: Kernel ALSA substream.
+ * @command: Substream command (SNDRV_PCM_TRIGGER_XXX).
+ *
+ * Context: Any context. Takes and releases the VirtIO substream spinlock.
+ * May take and release the tx/rx queue spinlock.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_trigger(struct snd_pcm_substream *substream, int command)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+ struct virtio_snd *snd = vss->snd;
+ struct virtio_snd_queue *queue;
+ struct virtio_snd_msg *msg;
+ unsigned long flags;
+ int rc;
+
+ switch (command) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ queue = virtsnd_pcm_queue(vss);
+
+ spin_lock_irqsave(&queue->lock, flags);
+ spin_lock(&vss->lock);
+ rc = virtsnd_pcm_msg_send(vss);
+ if (!rc)
+ vss->xfer_enabled = true;
+ spin_unlock(&vss->lock);
+ spin_unlock_irqrestore(&queue->lock, flags);
+ if (rc)
+ return rc;
+
+ msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_START,
+ GFP_KERNEL);
+ if (!msg) {
+ spin_lock_irqsave(&vss->lock, flags);
+ vss->xfer_enabled = false;
+ spin_unlock_irqrestore(&vss->lock, flags);
+
+ return -ENOMEM;
+ }
+
+ return virtsnd_ctl_msg_send_sync(snd, msg);
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ vss->suspended = true;
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_STOP:
+ vss->stopped = true;
+ fallthrough;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ spin_lock_irqsave(&vss->lock, flags);
+ vss->xfer_enabled = false;
+ spin_unlock_irqrestore(&vss->lock, flags);
+
+ msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_STOP,
+ GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ return virtsnd_ctl_msg_send_sync(snd, msg);
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * virtsnd_pcm_sync_stop() - Synchronous PCM substream stop.
+ * @substream: Kernel ALSA substream.
+ *
+ * The function can be called both from the upper level or from the driver
+ * itself.
+ *
+ * Context: Process context. Takes and releases the VirtIO substream spinlock.
+ * Return: 0 on success, -errno on failure.
+ */
+static int virtsnd_pcm_sync_stop(struct snd_pcm_substream *substream)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+ struct virtio_snd *snd = vss->snd;
+ struct virtio_snd_msg *msg;
+ unsigned int js = msecs_to_jiffies(virtsnd_msg_timeout_ms);
+ int rc;
+
+ cancel_work_sync(&vss->elapsed_period);
+
+ if (!vss->stopped)
+ return 0;
+
+ msg = virtsnd_pcm_ctl_msg_alloc(vss, VIRTIO_SND_R_PCM_RELEASE,
+ GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ rc = virtsnd_ctl_msg_send_sync(snd, msg);
+ if (rc)
+ return rc;
+
+ /*
+ * The spec states that upon receipt of the RELEASE command "the device
+ * MUST complete all pending I/O messages for the specified stream ID".
+ * Thus, we consider the absence of I/O messages in the queue as an
+ * indication that the substream has been released.
+ */
+ rc = wait_event_interruptible_timeout(vss->msg_empty,
+ !virtsnd_pcm_msg_pending_num(vss),
+ js);
+ if (rc <= 0) {
+ dev_warn(&snd->vdev->dev, "SID %u: failed to flush I/O queue\n",
+ vss->sid);
+
+ return !rc ? -ETIMEDOUT : rc;
+ }
+
+ vss->stopped = false;
+
+ return 0;
+}
+
+/**
+ * virtsnd_pcm_pointer() - Get the current hardware position for the PCM
+ * substream.
+ * @substream: Kernel ALSA substream.
+ *
+ * Context: Any context. Takes and releases the VirtIO substream spinlock.
+ * Return: Hardware position in frames inside [0 ... buffer_size) range.
+ */
+static snd_pcm_uframes_t
+virtsnd_pcm_pointer(struct snd_pcm_substream *substream)
+{
+ struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream);
+ snd_pcm_uframes_t hw_ptr = SNDRV_PCM_POS_XRUN;
+ unsigned long flags;
+
+ spin_lock_irqsave(&vss->lock, flags);
+ if (!vss->xfer_xrun)
+ hw_ptr = bytes_to_frames(substream->runtime, vss->hw_ptr);
+ spin_unlock_irqrestore(&vss->lock, flags);
+
+ return hw_ptr;
+}
+
+/* PCM substream operators map. */
+const struct snd_pcm_ops virtsnd_pcm_ops = {
+ .open = virtsnd_pcm_open,
+ .close = virtsnd_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = virtsnd_pcm_hw_params,
+ .hw_free = virtsnd_pcm_hw_free,
+ .prepare = virtsnd_pcm_prepare,
+ .trigger = virtsnd_pcm_trigger,
+ .sync_stop = virtsnd_pcm_sync_stop,
+ .pointer = virtsnd_pcm_pointer,
+};