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path: root/drivers/vdpa/vdpa_user/vduse_dev.c
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Diffstat (limited to 'drivers/vdpa/vdpa_user/vduse_dev.c')
-rw-r--r--drivers/vdpa/vdpa_user/vduse_dev.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 77da3685568a..8c06f6ab960b 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -459,6 +459,7 @@ static void vduse_dev_reset(struct vduse_dev *dev)
spin_lock(&vq->irq_lock);
vq->cb.callback = NULL;
vq->cb.private = NULL;
+ vq->cb.trigger = NULL;
spin_unlock(&vq->irq_lock);
flush_work(&vq->inject);
flush_work(&vq->kick);
@@ -524,6 +525,7 @@ static void vduse_vdpa_set_vq_cb(struct vdpa_device *vdpa, u16 idx,
spin_lock(&vq->irq_lock);
vq->cb.callback = cb->callback;
vq->cb.private = cb->private;
+ vq->cb.trigger = cb->trigger;
spin_unlock(&vq->irq_lock);
}
@@ -941,6 +943,23 @@ static void vduse_vq_irq_inject(struct work_struct *work)
spin_unlock_irq(&vq->irq_lock);
}
+static bool vduse_vq_signal_irqfd(struct vduse_virtqueue *vq)
+{
+ bool signal = false;
+
+ if (!vq->cb.trigger)
+ return false;
+
+ spin_lock_irq(&vq->irq_lock);
+ if (vq->ready && vq->cb.trigger) {
+ eventfd_signal(vq->cb.trigger, 1);
+ signal = true;
+ }
+ spin_unlock_irq(&vq->irq_lock);
+
+ return signal;
+}
+
static int vduse_dev_queue_irq_work(struct vduse_dev *dev,
struct work_struct *irq_work,
int irq_effective_cpu)
@@ -1243,11 +1262,14 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
if (index >= dev->vq_num)
break;
+ ret = 0;
index = array_index_nospec(index, dev->vq_num);
-
- vduse_vq_update_effective_cpu(dev->vqs[index]);
- ret = vduse_dev_queue_irq_work(dev, &dev->vqs[index]->inject,
- dev->vqs[index]->irq_effective_cpu);
+ if (!vduse_vq_signal_irqfd(dev->vqs[index])) {
+ vduse_vq_update_effective_cpu(dev->vqs[index]);
+ ret = vduse_dev_queue_irq_work(dev,
+ &dev->vqs[index]->inject,
+ dev->vqs[index]->irq_effective_cpu);
+ }
break;
}
case VDUSE_IOTLB_REG_UMEM: {