drm/i915/gvt: add the missing mdev attribute "name"

The mdev attribute "name" is required by some middle software, e.g.
KubeVirt, an open source SW that manages VM on Kubernetes cluster uses
the mdev sysfs directory/file structure to discover mediated device in
nodes in the cluster.

v2:

- Fix the missing defination in gvt_type_attrs. (Zhenyu)

Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Hui Chun Ong <hui.chun.ong@intel.com>
Cc: Terrence Xu <terrence.xu@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhi Wang <zhi.wang.linux@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20220222150532.9090-1-zhi.a.wang@intel.com
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index e8d6c76e92341cb1bf3c12385d00efe1dc5210ef..057ec4490104586181c8c794309834a352856071 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -188,14 +188,29 @@ static ssize_t description_show(struct mdev_type *mtype,
                       type->weight);
 }
 
+static ssize_t name_show(struct mdev_type *mtype,
+                        struct mdev_type_attribute *attr, char *buf)
+{
+       struct intel_vgpu_type *type;
+       struct intel_gvt *gvt = kdev_to_i915(mtype_get_parent_dev(mtype))->gvt;
+
+       type = &gvt->types[mtype_get_type_group_id(mtype)];
+       if (!type)
+               return 0;
+
+       return sprintf(buf, "%s\n", type->name);
+}
+
 static MDEV_TYPE_ATTR_RO(available_instances);
 static MDEV_TYPE_ATTR_RO(device_api);
 static MDEV_TYPE_ATTR_RO(description);
+static MDEV_TYPE_ATTR_RO(name);
 
 static struct attribute *gvt_type_attrs[] = {
        &mdev_type_attr_available_instances.attr,
        &mdev_type_attr_device_api.attr,
        &mdev_type_attr_description.attr,
+       &mdev_type_attr_name.attr,
        NULL,
 };