Certain device tree properties (e.g. the device node name, the compatible
string), are available as a list of strings (separated by the null
terminating character). Let the VFIO user query this type of properties.
Signed-off-by: Antonios Motakis <a.motakis@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/vfio/platform/devtree.c | 43 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/platform/devtree.c b/drivers/vfio/platform/devtree.c
index 032ee16..6d25f97 100644
--- a/drivers/vfio/platform/devtree.c
+++ b/drivers/vfio/platform/devtree.c
@@ -45,11 +45,52 @@ static int devtree_get_prop_list(struct device_node *np, unsigned *lenp,
return ret;
}
+static int devtree_get_full_name(struct device_node *np, unsigned *lenp,
+ void __user *datap, unsigned long datasz)
+{
+ int len = strlen(np->full_name) + 1;
+
+ if (lenp)
+ *lenp = len;
+
+ if (len > datasz)
+ return -EAGAIN;
+
+ if (copy_to_user(datap, np->full_name, len))
+ return -EFAULT;
+
+ return 0;
+}
+
static int devtree_get_strings(struct device_node *np,
char *name, unsigned *lenp,
void __user *datap, unsigned long datasz)
{
- return -EINVAL;
+ struct property *prop;
+ int len;
+
+ prop = of_find_property(np, name, &len);
+
+ if (!prop) {
+ /* special case full_name as a property that is not on the fdt,
+ * but we wish to return to the user as it includes the full
+ * path of the device */
+ if (!strcmp(name, "full_name"))
+ return devtree_get_full_name(np, lenp, datap, datasz);
+ else
+ return -EINVAL;
+ }
+
+ if (lenp)
+ *lenp = len;
+
+ if (len > datasz)
+ return -EAGAIN;
+
+ if (copy_to_user(datap, prop->value, len))
+ return -EFAULT;
+
+ return 0;
}
static int devtree_get_uint(struct device_node *np, char *name,
--
2.1.1
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