/* Notify all virtqueues on an interrupt. */
static irqreturn_t vm_interrupt(int irq, void *opaque)
{
struct virtio_mmio_device *vm_dev = opaque;
struct virtio_mmio_vq_info *info;
struct virtio_driver *vdrv = container_of(vm_dev->vdev.dev.driver,
struct virtio_driver, driver);
unsigned long status;
unsigned long flags;
irqreturn_t ret = IRQ_NONE;
/* Read and acknowledge interrupts */
status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS);
writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK);
if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)
&& vdrv && vdrv->config_changed) {
vdrv->config_changed(&vm_dev->vdev);
ret = IRQ_HANDLED;
}
if (likely(status & VIRTIO_MMIO_INT_VRING)) {
spin_lock_irqsave(&vm_dev->lock, flags);
list_for_each_entry(info, &vm_dev->virtqueues, node)
ret |= vring_interrupt(irq, info->vq);
spin_unlock_irqrestore(&vm_dev->lock, flags);
}
return ret;
}
static irqreturn_t
mic_virtio_intr_handler(int irq, void *data)
{
struct mic_vdev *mvdev = data;
struct virtqueue *vq;
mic_ack_interrupt(mvdev->mdev);
list_for_each_entry(vq, &mvdev->vdev.vqs, list)
vring_interrupt(0, vq);
return IRQ_HANDLED;
}
static irqreturn_t vop_virtio_intr_handler(int irq, void *data)
{
struct _vop_vdev *vdev = data;
struct vop_device *vpdev = vdev->vpdev;
struct virtqueue *vq;
vpdev->hw_ops->ack_interrupt(vpdev, vdev->h2c_vdev_db);
list_for_each_entry(vq, &vdev->vdev.vqs, list)
vring_interrupt(0, vq);
return IRQ_HANDLED;
}
static void handle_event(struct work_struct *work)
{
struct virtqueue *vq;
flush_cache_all();
outer_flush_range(zynq_rpmsg_p->mem_start, zynq_rpmsg_p->mem_end);
vq = zynq_rpmsg_p->vrings[0].vq;
if (vring_interrupt(0, vq) == IRQ_NONE)
dev_dbg(&zynq_rpmsg_platform->dev, "no message found in vqid 0\n");
}
/*
* we emulate the request_irq behaviour on top of s390 extints
*/
static void kvm_extint_handler(struct ext_code ext_code,
unsigned int param32, unsigned long param64)
{
struct virtqueue *vq;
u32 param;
if ((ext_code.subcode & 0xff00) != VIRTIO_SUBCODE_64)
return;
kstat_cpu(smp_processor_id()).irqs[EXTINT_VRT]++;
/* The LSB might be overloaded, we have to mask it */
vq = (struct virtqueue *)(param64 & ~1UL);
/* We use ext_params to decide what this interrupt means */
param = param32 & VIRTIO_PARAM_MASK;
switch (param) {
case VIRTIO_PARAM_CONFIG_CHANGED:
{
struct virtio_driver *drv;
drv = container_of(vq->vdev->dev.driver,
struct virtio_driver, driver);
if (drv->config_changed)
drv->config_changed(vq->vdev);
break;
}
case VIRTIO_PARAM_DEV_ADD:
schedule_work(&hotplug_work);
break;
case VIRTIO_PARAM_VRING_INTERRUPT:
default:
vring_interrupt(0, vq);
break;
}
}
