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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
