return vdev;
}
-static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
- bool assign, bool set_handler)
+static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
{
- VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
- VirtQueue *vq = virtio_get_queue(vdev, n);
- EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
- int r = 0;
- SubchDev *sch = dev->sch;
- uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;
+ virtio_bus_start_ioeventfd(&dev->bus);
+}
- if (assign) {
- r = event_notifier_init(notifier, 1);
- if (r < 0) {
- error_report("%s: unable to init event notifier: %d", __func__, r);
- return r;
- }
- virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
- r = s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
- if (r < 0) {
- error_report("%s: unable to assign ioeventfd: %d", __func__, r);
- virtio_queue_set_host_notifier_fd_handler(vq, false, false);
- event_notifier_cleanup(notifier);
- return r;
- }
- } else {
- virtio_queue_set_host_notifier_fd_handler(vq, false, false);
- s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
- event_notifier_cleanup(notifier);
- }
- return r;
+static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
+{
+ virtio_bus_stop_ioeventfd(&dev->bus);
}
-static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
+static bool virtio_ccw_ioeventfd_started(DeviceState *d)
{
- VirtIODevice *vdev;
- int n, r;
+ VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
- if (!(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) ||
- dev->ioeventfd_disabled ||
- dev->ioeventfd_started) {
- return;
- }
- vdev = virtio_bus_get_device(&dev->bus);
- for (n = 0; n < VIRTIO_CCW_QUEUE_MAX; n++) {
- if (!virtio_queue_get_num(vdev, n)) {
- continue;
- }
- r = virtio_ccw_set_guest2host_notifier(dev, n, true, true);
- if (r < 0) {
- goto assign_error;
- }
- }
- dev->ioeventfd_started = true;
- return;
+ return dev->ioeventfd_started;
+}
- assign_error:
- while (--n >= 0) {
- if (!virtio_queue_get_num(vdev, n)) {
- continue;
- }
- r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
- assert(r >= 0);
+static void virtio_ccw_ioeventfd_set_started(DeviceState *d, bool started,
+ bool err)
+{
+ VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+
+ dev->ioeventfd_started = started;
+ if (err) {
+ /* Disable ioeventfd for this device. */
+ dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
}
- dev->ioeventfd_started = false;
- /* Disable ioeventfd for this device. */
- dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
- error_report("%s: failed. Fallback to userspace (slower).", __func__);
}
-static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
+static bool virtio_ccw_ioeventfd_disabled(DeviceState *d)
{
- VirtIODevice *vdev;
- int n, r;
+ VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
- if (!dev->ioeventfd_started) {
- return;
- }
- vdev = virtio_bus_get_device(&dev->bus);
- for (n = 0; n < VIRTIO_CCW_QUEUE_MAX; n++) {
- if (!virtio_queue_get_num(vdev, n)) {
- continue;
- }
- r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
- assert(r >= 0);
- }
- dev->ioeventfd_started = false;
+ return dev->ioeventfd_disabled ||
+ !(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD);
+}
+
+static void virtio_ccw_ioeventfd_set_disabled(DeviceState *d, bool disabled)
+{
+ VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+
+ dev->ioeventfd_disabled = disabled;
+}
+
+static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier,
+ int n, bool assign)
+{
+ VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
+ SubchDev *sch = dev->sch;
+ uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;
+
+ return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
}
VirtualCssBus *virtual_css_bus_init(void)
return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
}
-static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
-{
- VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
-
- /* Stop using the generic ioeventfd, we are doing eventfd handling
- * ourselves below */
- dev->ioeventfd_disabled = assign;
- if (assign) {
- virtio_ccw_stop_ioeventfd(dev);
- }
- return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
-}
-
static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
{
int r;
k->notify = virtio_ccw_notify;
k->vmstate_change = virtio_ccw_vmstate_change;
k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
- k->set_host_notifier = virtio_ccw_set_host_notifier;
k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
k->save_queue = virtio_ccw_save_queue;
k->load_queue = virtio_ccw_load_queue;
k->device_plugged = virtio_ccw_device_plugged;
k->post_plugged = virtio_ccw_post_plugged;
k->device_unplugged = virtio_ccw_device_unplugged;
+ k->ioeventfd_started = virtio_ccw_ioeventfd_started;
+ k->ioeventfd_set_started = virtio_ccw_ioeventfd_set_started;
+ k->ioeventfd_disabled = virtio_ccw_ioeventfd_disabled;
+ k->ioeventfd_set_disabled = virtio_ccw_ioeventfd_set_disabled;
+ k->ioeventfd_assign = virtio_ccw_ioeventfd_assign;
}
static const TypeInfo virtio_ccw_bus_info = {