linux/drivers/vfio/mdev/mdev_driver.c
Christoph Hellwig 685a1537f4 vfio/mdev: consolidate all the description sysfs into the core code
Every driver just emits a string, simply add a method to the mdev_driver
to return it and provide a standard sysfs show function.

Remove the now unused types_attrs field in struct mdev_driver and the
support code for it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Kirti Wankhede <kwankhede@nvidia.com>
Link: https://lore.kernel.org/r/20220923092652.100656-14-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2022-10-04 12:06:58 -06:00

76 lines
1.6 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* MDEV driver
*
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
* Author: Neo Jia <cjia@nvidia.com>
* Kirti Wankhede <kwankhede@nvidia.com>
*/
#include <linux/iommu.h>
#include <linux/mdev.h>
#include "mdev_private.h"
static int mdev_probe(struct device *dev)
{
struct mdev_driver *drv =
container_of(dev->driver, struct mdev_driver, driver);
if (!drv->probe)
return 0;
return drv->probe(to_mdev_device(dev));
}
static void mdev_remove(struct device *dev)
{
struct mdev_driver *drv =
container_of(dev->driver, struct mdev_driver, driver);
if (drv->remove)
drv->remove(to_mdev_device(dev));
}
static int mdev_match(struct device *dev, struct device_driver *drv)
{
/*
* No drivers automatically match. Drivers are only bound by explicit
* device_driver_attach()
*/
return 0;
}
struct bus_type mdev_bus_type = {
.name = "mdev",
.probe = mdev_probe,
.remove = mdev_remove,
.match = mdev_match,
};
/**
* mdev_register_driver - register a new MDEV driver
* @drv: the driver to register
*
* Returns a negative value on error, otherwise 0.
**/
int mdev_register_driver(struct mdev_driver *drv)
{
if (!drv->device_api)
return -EINVAL;
/* initialize common driver fields */
drv->driver.bus = &mdev_bus_type;
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(mdev_register_driver);
/*
* mdev_unregister_driver - unregister MDEV driver
* @drv: the driver to unregister
*/
void mdev_unregister_driver(struct mdev_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(mdev_unregister_driver);