linux-kernel - [PATCH 1/3] vfio: ap: realize the VFIO_DEVICE_GET_IRQ

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Date:   Tue, 30 May 2023 18:35:36 -0400
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     jjherne@...ux.ibm.com, pasic@...ux.ibm.com, farman@...ux.ibm.com,
        mjrosato@...ux.ibm.com, alex.williamson@...hat.com,
        borntraeger@...ux.ibm.com
Subject: [PATCH 1/3] 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: Tony Krowiak <akrowiak@...ux.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