linux-kernel - [PATCH v1 3/5] mdev: Expose mdev alias in sysfs tree

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Message-Id: <20190827191654.41161-4-parav@mellanox.com>
Date:   Tue, 27 Aug 2019 14:16:52 -0500
From:   Parav Pandit <parav@...lanox.com>
To:     alex.williamson@...hat.com, jiri@...lanox.com,
        kwankhede@...dia.com, cohuck@...hat.com, davem@...emloft.net
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Parav Pandit <parav@...lanox.com>
Subject: [PATCH v1 3/5] mdev: Expose mdev alias in sysfs tree

Expose the optional alias for an mdev device as a sysfs attribute.
This way, userspace tools such as udev may make use of the alias, for
example to create a netdevice name for the mdev.

Signed-off-by: Parav Pandit <parav@...lanox.com>

---
Changelog:
v0->v1:
 - Addressed comments from Cornelia Huck
 - Updated commit description
---
 drivers/vfio/mdev/mdev_sysfs.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 43afe0e80b76..59f4e3cc5233 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -246,7 +246,20 @@ static ssize_t remove_store(struct device *dev, struct device_attribute *attr,
 
 static DEVICE_ATTR_WO(remove);
 
+static ssize_t alias_show(struct device *device,
+			  struct device_attribute *attr, char *buf)
+{
+	struct mdev_device *dev = mdev_from_dev(device);
+
+	if (!dev->alias)
+		return -EOPNOTSUPP;
+
+	return sprintf(buf, "%s\n", dev->alias);
+}
+static DEVICE_ATTR_RO(alias);
+
 static const struct attribute *mdev_device_attrs[] = {
+	&dev_attr_alias.attr,
 	&dev_attr_remove.attr,
 	NULL,
 };
-- 
2.19.2