[PATCH 1/3] vfio: ap: realize the VFIO_DEVICE_GET_IRQ_INFO ioctl

Tony Krowiak
2023-05-30T22:40:11Z

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>
---
drivers/s390/crypto/vfio_ap_ops.c | 30 +++++++++++++++++++++++++++++-
include/uapi/linux/vfio.h | 9 +++++++++
2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index cfbcb864ab63..35cd90eee937 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -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;
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 0552e8dcf0cb..b71276bd7f91 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -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)
--
2.31.1