diff options
| author | Viktor Prutyanov <viktor@daynix.com> | 2023-04-13 11:18:54 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-04-21 03:02:35 -0400 |
| commit | af8ececda185078c096852edb4e1d7a2349e6856 (patch) | |
| tree | 2c27175bfdfe911223c936341a1e617d6db91531 /drivers/s390/virtio | |
| parent | 3616bf377a5a8ef4f124dfde5f3522c4da335561 (diff) | |
virtio: add VIRTIO_F_NOTIFICATION_DATA feature support
According to VirtIO spec v1.2, VIRTIO_F_NOTIFICATION_DATA feature
indicates that the driver passes extra data along with the queue
notifications.
In a split queue case, the extra data is 16-bit available index. In a
packed queue case, the extra data is 1-bit wrap counter and 15-bit
available index.
Add support for this feature for MMIO, channel I/O and modern PCI
transports.
Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Message-Id: <20230413081855.36643-2-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/s390/virtio')
| -rw-r--r-- | drivers/s390/virtio/virtio_ccw.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c index 954fc31b4bc7..02922768b129 100644 --- a/drivers/s390/virtio/virtio_ccw.c +++ b/drivers/s390/virtio/virtio_ccw.c @@ -391,7 +391,7 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, ccw_device_dma_free(vcdev->cdev, thinint_area, sizeof(*thinint_area)); } -static bool virtio_ccw_kvm_notify(struct virtqueue *vq) +static inline bool virtio_ccw_do_kvm_notify(struct virtqueue *vq, u32 data) { struct virtio_ccw_vq_info *info = vq->priv; struct virtio_ccw_device *vcdev; @@ -402,12 +402,22 @@ static bool virtio_ccw_kvm_notify(struct virtqueue *vq) BUILD_BUG_ON(sizeof(struct subchannel_id) != sizeof(unsigned int)); info->cookie = kvm_hypercall3(KVM_S390_VIRTIO_CCW_NOTIFY, *((unsigned int *)&schid), - vq->index, info->cookie); + data, info->cookie); if (info->cookie < 0) return false; return true; } +static bool virtio_ccw_kvm_notify(struct virtqueue *vq) +{ + return virtio_ccw_do_kvm_notify(vq, vq->index); +} + +static bool virtio_ccw_kvm_notify_with_data(struct virtqueue *vq) +{ + return virtio_ccw_do_kvm_notify(vq, vring_notification_data(vq)); +} + static int virtio_ccw_read_vq_conf(struct virtio_ccw_device *vcdev, struct ccw1 *ccw, int index) { @@ -495,6 +505,7 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, struct ccw1 *ccw) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); + bool (*notify)(struct virtqueue *vq); int err; struct virtqueue *vq = NULL; struct virtio_ccw_vq_info *info; @@ -502,6 +513,11 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, unsigned long flags; bool may_reduce; + if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) + notify = virtio_ccw_kvm_notify_with_data; + else + notify = virtio_ccw_kvm_notify; + /* Allocate queue. */ info = kzalloc(sizeof(struct virtio_ccw_vq_info), GFP_KERNEL); if (!info) { @@ -524,7 +540,7 @@ static struct virtqueue *virtio_ccw_setup_vq(struct virtio_device *vdev, may_reduce = vcdev->revision > 0; vq = vring_create_virtqueue(i, info->num, KVM_VIRTIO_CCW_RING_ALIGN, vdev, true, may_reduce, ctx, - virtio_ccw_kvm_notify, callback, name); + notify, callback, name); if (!vq) { /* For now, we fail if we can't get the requested size. */ |