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 10:02:35 +0300 |
| commit | af8ececda185078c096852edb4e1d7a2349e6856 (patch) | |
| tree | 2c27175bfdfe911223c936341a1e617d6db91531 /drivers/virtio/virtio_mmio.c | |
| parent | 3616bf377a5a8ef4f124dfde5f3522c4da335561 (diff) | |
| download | linux-af8ececda185078c096852edb4e1d7a2349e6856.tar.xz | |
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/virtio/virtio_mmio.c')
| -rw-r--r-- | drivers/virtio/virtio_mmio.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index 3ff746e3f24a..dd4424c14233 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -285,6 +285,16 @@ static bool vm_notify(struct virtqueue *vq) return true; } +static bool vm_notify_with_data(struct virtqueue *vq) +{ + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev); + u32 data = vring_notification_data(vq); + + writel(data, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY); + + return true; +} + /* Notify all virtqueues on an interrupt. */ static irqreturn_t vm_interrupt(int irq, void *opaque) { @@ -363,12 +373,18 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in const char *name, bool ctx) { struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); + bool (*notify)(struct virtqueue *vq); struct virtio_mmio_vq_info *info; struct virtqueue *vq; unsigned long flags; unsigned int num; int err; + if (__virtio_test_bit(vdev, VIRTIO_F_NOTIFICATION_DATA)) + notify = vm_notify_with_data; + else + notify = vm_notify; + if (!name) return NULL; @@ -397,7 +413,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int in /* Create the vring */ vq = vring_create_virtqueue(index, num, VIRTIO_MMIO_VRING_ALIGN, vdev, - true, true, ctx, vm_notify, callback, name); + true, true, ctx, notify, callback, name); if (!vq) { err = -ENOMEM; goto error_new_virtqueue; |