drm/i915/gvt: Add mdev device attribute group

This adds initial attribute group for mdev to hold vGPU related
for each mdev device, currently just vGPU id is shown.

v2: rename group name as "intel_vgpu"

Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 1ea3eb270de8..c7e7c9377cef 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1146,8 +1146,40 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
         return 0;
 }
 
+static ssize_t
+vgpu_id_show(struct device *dev, struct device_attribute *attr,
+             char *buf)
+{
+        struct mdev_device *mdev = mdev_from_dev(dev);
+
+        if (mdev) {
+                struct intel_vgpu *vgpu = (struct intel_vgpu *)
+                        mdev_get_drvdata(mdev);
+                return sprintf(buf, "%d\n", vgpu->id);
+        }
+        return sprintf(buf, "\n");
+}
+
+static DEVICE_ATTR_RO(vgpu_id);
+
+static struct attribute *intel_vgpu_attrs[] = {
+        &dev_attr_vgpu_id.attr,
+        NULL
+};
+
+static const struct attribute_group intel_vgpu_group = {
+        .name = "intel_vgpu",
+        .attrs = intel_vgpu_attrs,
+};
+
+static const struct attribute_group *intel_vgpu_groups[] = {
+        &intel_vgpu_group,
+        NULL,
+};
+
 static const struct mdev_parent_ops intel_vgpu_ops = {
         .supported_type_groups  = intel_vgpu_type_groups,
+        .mdev_attr_groups       = intel_vgpu_groups,
         .create                 = intel_vgpu_create,
         .remove                 = intel_vgpu_remove,