The available properties of a device are not indexed numerically,
instead they are accessible by property name.
Passing type = VFIO_DEVTREE_PROP_LIST 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 | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/platform/devtree.c b/drivers/vfio/platform/devtree.c
index c057be3..032ee16 100644
--- a/drivers/vfio/platform/devtree.c
+++ b/drivers/vfio/platform/devtree.c
@@ -7,7 +7,42 @@
static int devtree_get_prop_list(struct device_node *np, unsigned *lenp,
void __user *datap, unsigned long datasz)
{
- return -EINVAL;
+ 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;
}
static int devtree_get_strings(struct device_node *np,
--
2.1.1
--
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