[PATCH RFC v3 10/14] drm/vkms: Introduce configfs for device name

[Louis Chauvet]

To allows the userspace to identify the device once it is enabled, create
a file to fetch it.

This file can only be read once the device is enabled, and will return the
device name, which can later be used to use it.

Signed-off-by: Louis Chauvet <louis.chau...@bootlin.com>
---
 drivers/gpu/drm/vkms/vkms_configfs.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c 
b/drivers/gpu/drm/vkms/vkms_configfs.c
index 
eeb0c1e1b225f2a1a35ac6deb9457b90ba6542e5..d0bc6adfdae85b82ca043d318f84fca70840526c
 100644
--- a/drivers/gpu/drm/vkms/vkms_configfs.c
+++ b/drivers/gpu/drm/vkms/vkms_configfs.c
@@ -927,10 +927,26 @@ static ssize_t device_enable_store(struct config_item 
*item,
        return (ssize_t)count;
 }
 
+static ssize_t device_device_name_show(struct config_item *item, char *page)
+{
+       struct vkms_configfs_device *configfs_device = 
config_item_to_vkms_configfs_device(item);
+
+       scoped_guard(mutex, &configfs_device->lock)
+       {
+               if (configfs_device->enabled)
+                       return sprintf(page, "%s\n",
+                                      
dev_name(configfs_device->vkms_config->dev->drm.dev));
+               return -EINVAL;
+       }
+       return -EINVAL;
+}
+
 CONFIGFS_ATTR(device_, enable);
+CONFIGFS_ATTR_RO(device_, device_name);
 
 static struct configfs_attribute *device_attrs[] = {
        &device_attr_enable,
+       &device_attr_device_name,
        NULL,
 };
 

-- 
2.47.1