290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
/*
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* Vhost-user i2c virtio device
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*
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* Copyright (c) 2021 Viresh Kumar <viresh.kumar@linaro.org>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/qdev-properties.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/vhost-user-i2c.h"
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#include "qemu/error-report.h"
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#include "standard-headers/linux/virtio_ids.h"
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static const int feature_bits[] = {
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VIRTIO_I2C_F_ZERO_LENGTH_REQUEST,
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VHOST_INVALID_FEATURE_BIT
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};
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static void vu_i2c_start(VirtIODevice *vdev)
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{
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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int ret, i;
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if (!k->set_guest_notifiers) {
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error_report("binding does not support guest notifiers");
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return;
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}
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ret = vhost_dev_enable_notifiers(&i2c->vhost_dev, vdev);
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if (ret < 0) {
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error_report("Error enabling host notifiers: %d", -ret);
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return;
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}
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ret = k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, true);
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if (ret < 0) {
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error_report("Error binding guest notifier: %d", -ret);
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goto err_host_notifiers;
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}
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i2c->vhost_dev.acked_features = vdev->guest_features;
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ret = vhost_dev_start(&i2c->vhost_dev, vdev);
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if (ret < 0) {
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error_report("Error starting vhost-user-i2c: %d", -ret);
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goto err_guest_notifiers;
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}
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/*
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* guest_notifier_mask/pending not used yet, so just unmask
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* everything here. virtio-pci will do the right thing by
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* enabling/disabling irqfd.
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*/
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for (i = 0; i < i2c->vhost_dev.nvqs; i++) {
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vhost_virtqueue_mask(&i2c->vhost_dev, vdev, i, false);
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}
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return;
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err_guest_notifiers:
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k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, false);
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err_host_notifiers:
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vhost_dev_disable_notifiers(&i2c->vhost_dev, vdev);
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}
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static void vu_i2c_stop(VirtIODevice *vdev)
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{
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
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VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
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int ret;
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if (!k->set_guest_notifiers) {
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return;
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}
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vhost_dev_stop(&i2c->vhost_dev, vdev);
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ret = k->set_guest_notifiers(qbus->parent, i2c->vhost_dev.nvqs, false);
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if (ret < 0) {
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error_report("vhost guest notifier cleanup failed: %d", ret);
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return;
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}
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vhost_dev_disable_notifiers(&i2c->vhost_dev, vdev);
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}
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static void vu_i2c_set_status(VirtIODevice *vdev, uint8_t status)
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{
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
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if (!vdev->vm_running) {
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should_start = false;
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}
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if (i2c->vhost_dev.started == should_start) {
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return;
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}
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if (should_start) {
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vu_i2c_start(vdev);
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} else {
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vu_i2c_stop(vdev);
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}
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}
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static uint64_t vu_i2c_get_features(VirtIODevice *vdev,
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uint64_t requested_features, Error **errp)
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{
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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virtio_add_feature(&requested_features, VIRTIO_I2C_F_ZERO_LENGTH_REQUEST);
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return vhost_get_features(&i2c->vhost_dev, feature_bits, requested_features);
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}
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static void vu_i2c_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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/*
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* Not normally called; it's the daemon that handles the queue;
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* however virtio's cleanup path can call this.
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*/
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}
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static void vu_i2c_guest_notifier_mask(VirtIODevice *vdev, int idx, bool mask)
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{
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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vhost_virtqueue_mask(&i2c->vhost_dev, vdev, idx, mask);
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}
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static bool vu_i2c_guest_notifier_pending(VirtIODevice *vdev, int idx)
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{
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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return vhost_virtqueue_pending(&i2c->vhost_dev, idx);
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}
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static void do_vhost_user_cleanup(VirtIODevice *vdev, VHostUserI2C *i2c)
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{
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vhost_user_cleanup(&i2c->vhost_user);
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virtio_delete_queue(i2c->vq);
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virtio_cleanup(vdev);
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g_free(i2c->vhost_dev.vqs);
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i2c->vhost_dev.vqs = NULL;
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}
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static int vu_i2c_connect(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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if (i2c->connected) {
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return 0;
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}
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i2c->connected = true;
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/* restore vhost state */
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if (virtio_device_started(vdev, vdev->status)) {
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vu_i2c_start(vdev);
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}
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return 0;
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}
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static void vu_i2c_disconnect(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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if (!i2c->connected) {
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return;
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}
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i2c->connected = false;
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if (i2c->vhost_dev.started) {
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vu_i2c_stop(vdev);
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}
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}
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static void vu_i2c_event(void *opaque, QEMUChrEvent event)
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{
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DeviceState *dev = opaque;
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserI2C *i2c = VHOST_USER_I2C(vdev);
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switch (event) {
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case CHR_EVENT_OPENED:
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if (vu_i2c_connect(dev) < 0) {
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qemu_chr_fe_disconnect(&i2c->chardev);
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return;
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}
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break;
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case CHR_EVENT_CLOSED:
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vu_i2c_disconnect(dev);
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break;
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case CHR_EVENT_BREAK:
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case CHR_EVENT_MUX_IN:
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case CHR_EVENT_MUX_OUT:
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/* Ignore */
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break;
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}
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}
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static void vu_i2c_device_realize(DeviceState *dev, Error **errp)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserI2C *i2c = VHOST_USER_I2C(dev);
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int ret;
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if (!i2c->chardev.chr) {
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error_setg(errp, "vhost-user-i2c: missing chardev");
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return;
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}
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if (!vhost_user_init(&i2c->vhost_user, &i2c->chardev, errp)) {
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return;
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}
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virtio_init(vdev, VIRTIO_ID_I2C_ADAPTER, 0);
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i2c->vhost_dev.nvqs = 1;
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i2c->vq = virtio_add_queue(vdev, 4, vu_i2c_handle_output);
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i2c->vhost_dev.vqs = g_new0(struct vhost_virtqueue, i2c->vhost_dev.nvqs);
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ret = vhost_dev_init(&i2c->vhost_dev, &i2c->vhost_user,
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VHOST_BACKEND_TYPE_USER, 0, errp);
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if (ret < 0) {
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do_vhost_user_cleanup(vdev, i2c);
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}
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qemu_chr_fe_set_handlers(&i2c->chardev, NULL, NULL, vu_i2c_event, NULL,
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dev, NULL, true);
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}
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static void vu_i2c_device_unrealize(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostUserI2C *i2c = VHOST_USER_I2C(dev);
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/* This will stop vhost backend if appropriate. */
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vu_i2c_set_status(vdev, 0);
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vhost_dev_cleanup(&i2c->vhost_dev);
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do_vhost_user_cleanup(vdev, i2c);
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}
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static const VMStateDescription vu_i2c_vmstate = {
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.name = "vhost-user-i2c",
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.unmigratable = 1,
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};
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static Property vu_i2c_properties[] = {
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DEFINE_PROP_CHR("chardev", VHostUserI2C, chardev),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vu_i2c_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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device_class_set_props(dc, vu_i2c_properties);
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dc->vmsd = &vu_i2c_vmstate;
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set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
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vdc->realize = vu_i2c_device_realize;
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vdc->unrealize = vu_i2c_device_unrealize;
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vdc->get_features = vu_i2c_get_features;
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vdc->set_status = vu_i2c_set_status;
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vdc->guest_notifier_mask = vu_i2c_guest_notifier_mask;
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vdc->guest_notifier_pending = vu_i2c_guest_notifier_pending;
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}
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static const TypeInfo vu_i2c_info = {
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.name = TYPE_VHOST_USER_I2C,
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.parent = TYPE_VIRTIO_DEVICE,
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.instance_size = sizeof(VHostUserI2C),
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.class_init = vu_i2c_class_init,
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};
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static void vu_i2c_register_types(void)
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{
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type_register_static(&vu_i2c_info);
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}
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type_init(vu_i2c_register_types)
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