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authorTony Krowiak <akrowiak@linux.ibm.com>2018-09-25 19:16:27 -0400
committerChristian Borntraeger <borntraeger@de.ibm.com>2018-09-28 15:50:11 +0200
commite06670c5fe3b3a55547e2caeaec34acfdb4885e3 (patch)
tree45190a6ecce526bb6f330552b691732f6e455345 /drivers/s390/crypto/vfio_ap_ops.c
parent258287c994de8f2f52430b8d79b4fdf2c95f8c91 (diff)
s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl
Adds support for the VFIO_DEVICE_GET_INFO ioctl to the VFIO AP Matrix device driver. This is a minimal implementation, as vfio-ap does not use I/O regions. Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com> Reviewed-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Acked-by: Halil Pasic <pasic@linux.ibm.com> Tested-by: Michael Mueller <mimu@linux.ibm.com> Tested-by: Farhan Ali <alifm@linux.ibm.com> Tested-by: Pierre Morel <pmorel@linux.ibm.com> Message-Id: <20180925231641.4954-13-akrowiak@linux.vnet.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/vfio_ap_ops.c')
-rw-r--r--drivers/s390/crypto/vfio_ap_ops.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 1fd0beefeda6..974cf06d8a5c 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -855,6 +855,43 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
module_put(THIS_MODULE);
}
+static int vfio_ap_mdev_get_device_info(unsigned long arg)
+{
+ unsigned long minsz;
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = VFIO_DEVICE_FLAGS_AP;
+ info.num_regions = 0;
+ info.num_irqs = 0;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+}
+
+static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
+ unsigned int cmd, unsigned long arg)
+{
+ int ret;
+
+ switch (cmd) {
+ case VFIO_DEVICE_GET_INFO:
+ ret = vfio_ap_mdev_get_device_info(arg);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.owner = THIS_MODULE,
.supported_type_groups = vfio_ap_mdev_type_groups,
@@ -863,6 +900,7 @@ static const struct mdev_parent_ops vfio_ap_matrix_ops = {
.remove = vfio_ap_mdev_remove,
.open = vfio_ap_mdev_open,
.release = vfio_ap_mdev_release,
+ .ioctl = vfio_ap_mdev_ioctl,
};
int vfio_ap_mdev_register(void)