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Commit 016c98c6 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin Committed by Rusty Russell
Browse files

virtio: unify config_changed handling 



Replace duplicated code in all transports with a single wrapper in
virtio.c.

The only functional change is in virtio_mmio.c: if a buggy device sends
us an interrupt before driver is set, we previously returned IRQ_NONE,
now we return IRQ_HANDLED.

As this must not happen in practice, this does not look like a big deal.

See also commit 3fff0179
	virtio-pci: do not oops on config change if driver not loaded.
for the original motivation behind the driver check.

Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 6fbc198c

drivers/misc/mic/card/mic_virtio.c

+1 −5
Original line number Diff line number Diff line
@@ -462,16 +462,12 @@ static void mic_handle_config_change(struct mic_device_desc __iomem *d, 
	struct mic_device_ctrl __iomem *dc

		= (void __iomem *)d + mic_aligned_desc_size(d);

	struct mic_vdev *mvdev = (struct mic_vdev *)ioread64(&dc->vdev);

	struct virtio_driver *drv;



	if (ioread8(&dc->config_change) != MIC_VIRTIO_PARAM_CONFIG_CHANGED)

		return;



	dev_dbg(mdrv->dev, "%s %d\n", __func__, __LINE__);

	drv = container_of(mvdev->vdev.dev.driver,

				struct virtio_driver, driver);

	if (drv->config_changed)

		drv->config_changed(&mvdev->vdev);

	virtio_config_changed(&mvdev->vdev);

	iowrite8(1, &dc->guest_ack);

}

drivers/s390/kvm/kvm_virtio.c

+1 −8
Original line number Diff line number Diff line
@@ -406,15 +406,8 @@ static void kvm_extint_handler(struct ext_code ext_code, 


	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);



		virtio_config_changed(vq->vdev);

		break;

	}

	case VIRTIO_PARAM_DEV_ADD:

		schedule_work(&hotplug_work);

		break;

drivers/s390/kvm/virtio_ccw.c

+1 −5
Original line number Diff line number Diff line
@@ -940,11 +940,7 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev, 
		vring_interrupt(0, vq);

	}

	if (test_bit(0, &vcdev->indicators2)) {

		drv = container_of(vcdev->vdev.dev.driver,

				   struct virtio_driver, driver);



		if (drv && drv->config_changed)

			drv->config_changed(&vcdev->vdev);

		virtio_config_changed(&vcdev->vdev);

		clear_bit(0, &vcdev->indicators2);

	}

}

drivers/virtio/virtio.c

+9 −0
Original line number Diff line number Diff line
@@ -239,6 +239,15 @@ void unregister_virtio_device(struct virtio_device *dev) 
}

EXPORT_SYMBOL_GPL(unregister_virtio_device);



void virtio_config_changed(struct virtio_device *dev)

{

	struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);



	if (drv && drv->config_changed)

		drv->config_changed(dev);

}

EXPORT_SYMBOL_GPL(virtio_config_changed);



static int virtio_init(void)

{

	if (bus_register(&virtio_bus) != 0)

drivers/virtio/virtio_mmio.c

+2 −5
Original line number Diff line number Diff line
@@ -234,8 +234,6 @@ 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;
@@ -244,9 +242,8 @@ static irqreturn_t vm_interrupt(int irq, void *opaque) 
	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);

	if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) {

		virtio_config_changed(&vm_dev->vdev);

		ret = IRQ_HANDLED;

	}