For various reasons, the available properties of the platform device
node in the device tree node should be referred to by the property name.
Passing type = VFIO_DEVTREE_PROP_NAMES to VFIO_DEVICE_GET_DEVTREE_INFO,
returns a list of strings with the available properties that the VFIO
user can access.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/platform/devtree.c | 68 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 67 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/platform/devtree.c b/drivers/vfio/platform/devtree.c
index 91cab88..b8fd4138 100644
--- a/drivers/vfio/platform/devtree.c
+++ b/drivers/vfio/platform/devtree.c
@@ -20,8 +20,74 @@ bool vfio_platform_has_devtree(struct vfio_platform_device *vdev)
return !!vdev->of_node;
}
+static int devtree_get_prop_names(struct device_node *np, void __user *datap,
+ unsigned long datasz, int *lenp)
+{
+ struct property *prop;
+ int len = 0, sz;
+ int ret = 0;
+
+ for_each_property_of_node(np, prop) {
+ sz = strlen(prop->name) + 1;
+
+ if (datasz < sz) {
+ ret = -EAGAIN;
+ break;
+ }
+
+ if (copy_to_user(datap, prop->name, sz))
+ return -EFAULT;
+
+ datap += sz;
+ datasz -= sz;
+ len += sz;
+ }
+
+ /* if overflow occurs, calculate remaining length */
+ while (prop) {
+ len += strlen(prop->name) + 1;
+ prop = prop->next;
+ }
+
+ /* we expose the full_name in addition to the usual properties */
+ len += sz = strlen("full_name") + 1;
+ if (datasz < sz) {
+ ret = -EAGAIN;
+ } else if (copy_to_user(datap, "full_name", sz))
+ return -EFAULT;
+
+ *lenp = len;
+
+ return ret;
+}
+
long vfio_platform_devtree_ioctl(struct vfio_platform_device *vdev,
unsigned long arg)
{
- return -EINVAL; /* not implemented yet */
+ struct vfio_devtree_info info;
+ unsigned long minsz = offsetofend(struct vfio_devtree_info, length);
+ void __user *datap = (void __user *) arg + minsz;
+ unsigned long int datasz;
+ int ret = -EINVAL;
+
+ if (!vfio_platform_has_devtree(vdev))
+ return -EINVAL;
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ datasz = info.argsz - minsz;
+
+ if (info.type == VFIO_DEVTREE_PROP_NAMES) {
+ ret = devtree_get_prop_names(vdev->of_node, datap, datasz,
+ &info.length);
+ }
+
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ ret = -EFAULT;
+
+ return ret;
}
--
1.8.3.2
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
