Commit 6afc7700 authored by Tony Krowiak's avatar Tony Krowiak Committed by Alexander Gordeev
Browse files

s390/vfio-ap: realize the VFIO_DEVICE_GET_IRQ_INFO ioctl 



Realize the VFIO_DEVICE_GET_IRQ_INFO ioctl to retrieve the information for
the VFIO device request IRQ.

Signed-off-by: default avatarTony Krowiak <akrowiak@linux.ibm.com>
Acked-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Reviewed-by: default avatarCédric Le Goater <clg@redhat.com>
Reviewed-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Tested-by: default avatarMatthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20230530223538.279198-2-akrowiak@linux.ibm.com


Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
parent e23b4fdb

drivers/s390/crypto/vfio_ap_ops.c

+29 −1
Original line number Diff line number Diff line
@@ -1750,7 +1750,32 @@ static int vfio_ap_mdev_get_device_info(unsigned long arg) 


	info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;

	info.num_regions = 0;

	info.num_irqs = 0;

	info.num_irqs = VFIO_AP_NUM_IRQS;



	return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;

}



static ssize_t vfio_ap_get_irq_info(unsigned long arg)

{

	unsigned long minsz;

	struct vfio_irq_info info;



	minsz = offsetofend(struct vfio_irq_info, count);



	if (copy_from_user(&info, (void __user *)arg, minsz))

		return -EFAULT;



	if (info.argsz < minsz || info.index >= VFIO_AP_NUM_IRQS)

		return -EINVAL;



	switch (info.index) {

	case VFIO_AP_REQ_IRQ_INDEX:

		info.count = 1;

		info.flags = VFIO_IRQ_INFO_EVENTFD;

		break;

	default:

		return -EINVAL;

	}



	return copy_to_user((void __user *)arg, &info, minsz) ? -EFAULT : 0;

}
@@ -1770,6 +1795,9 @@ static ssize_t vfio_ap_mdev_ioctl(struct vfio_device *vdev, 
	case VFIO_DEVICE_RESET:

		ret = vfio_ap_mdev_reset_queues(&matrix_mdev->qtable);

		break;

	case VFIO_DEVICE_GET_IRQ_INFO:

			ret = vfio_ap_get_irq_info(arg);

			break;

	default:

		ret = -EOPNOTSUPP;

		break;

include/uapi/linux/vfio.h

+9 −0
Original line number Diff line number Diff line
@@ -646,6 +646,15 @@ enum { 
	VFIO_CCW_NUM_IRQS

};



/*

 * The vfio-ap bus driver makes use of the following IRQ index mapping.

 * Unimplemented IRQ types return a count of zero.

 */

enum {

	VFIO_AP_REQ_IRQ_INDEX,

	VFIO_AP_NUM_IRQS

};



/**

 * VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 12,

 *					      struct vfio_pci_hot_reset_info)