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s390/vfio-ap: realize the VFIO_DEVICE_GET_IRQ_INFO ioctl

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

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Link: https://lore.kernel.org/r/20230530223538.279198-2-akrowiak@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Tony Krowiak 2023-05-30 18:35:36 -04:00 committed by Alexander Gordeev
parent e23b4fdb5c
commit 6afc770048
2 changed files with 38 additions and 1 deletions
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30
drivers/s390/crypto/vfio_ap_ops.c
View File

@ -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;

9
include/uapi/linux/vfio.h
View File

@ -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)