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virtio-ccw: convert to ioeventfd callbacks

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Use the new interface.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Cornelia Huck 2016-06-10 11:04:11 +02:00 committed by Michael S. Tsirkin
parent b1f0a33d80
commit 7c55f68a63
1 changed files with 49 additions and 92 deletions
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141
hw/s390x/virtio-ccw.c
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@ -69,92 +69,58 @@ VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch)
return vdev;
}
static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
bool assign, bool set_handler)
{
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;
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_start_ioeventfd(VirtioCcwDevice *dev)
{
VirtIODevice *vdev;
int n, r;
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;
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);
}
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__);
virtio_bus_start_ioeventfd(&dev->bus);
}
static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
{
VirtIODevice *vdev;
int n, r;
virtio_bus_stop_ioeventfd(&dev->bus);
}
if (!dev->ioeventfd_started) {
return;
static bool virtio_ccw_ioeventfd_started(DeviceState *d)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
return dev->ioeventfd_started;
}
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;
}
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;
}
static bool virtio_ccw_ioeventfd_disabled(DeviceState *d)
{
VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
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)
@ -1157,19 +1123,6 @@ static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
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;
@ -1798,7 +1751,6 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
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;
@ -1807,6 +1759,11 @@ static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
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 = {