120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/*
|
|
* MDEV driver
|
|
*
|
|
* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
|
|
* Author: Neo Jia <cjia@nvidia.com>
|
|
* Kirti Wankhede <kwankhede@nvidia.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/iommu.h>
|
|
#include <linux/mdev.h>
|
|
|
|
#include "mdev_private.h"
|
|
|
|
static int mdev_attach_iommu(struct mdev_device *mdev)
|
|
{
|
|
int ret;
|
|
struct iommu_group *group;
|
|
|
|
group = iommu_group_alloc();
|
|
if (IS_ERR(group))
|
|
return PTR_ERR(group);
|
|
|
|
ret = iommu_group_add_device(group, &mdev->dev);
|
|
if (!ret)
|
|
dev_info(&mdev->dev, "MDEV: group_id = %d\n",
|
|
iommu_group_id(group));
|
|
|
|
iommu_group_put(group);
|
|
return ret;
|
|
}
|
|
|
|
static void mdev_detach_iommu(struct mdev_device *mdev)
|
|
{
|
|
iommu_group_remove_device(&mdev->dev);
|
|
dev_info(&mdev->dev, "MDEV: detaching iommu\n");
|
|
}
|
|
|
|
static int mdev_probe(struct device *dev)
|
|
{
|
|
struct mdev_driver *drv = to_mdev_driver(dev->driver);
|
|
struct mdev_device *mdev = to_mdev_device(dev);
|
|
int ret;
|
|
|
|
ret = mdev_attach_iommu(mdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (drv && drv->probe) {
|
|
ret = drv->probe(dev);
|
|
if (ret)
|
|
mdev_detach_iommu(mdev);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mdev_remove(struct device *dev)
|
|
{
|
|
struct mdev_driver *drv = to_mdev_driver(dev->driver);
|
|
struct mdev_device *mdev = to_mdev_device(dev);
|
|
|
|
if (drv && drv->remove)
|
|
drv->remove(dev);
|
|
|
|
mdev_detach_iommu(mdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct bus_type mdev_bus_type = {
|
|
.name = "mdev",
|
|
.probe = mdev_probe,
|
|
.remove = mdev_remove,
|
|
};
|
|
EXPORT_SYMBOL_GPL(mdev_bus_type);
|
|
|
|
/**
|
|
* mdev_register_driver - register a new MDEV driver
|
|
* @drv: the driver to register
|
|
* @owner: module owner of driver to be registered
|
|
*
|
|
* Returns a negative value on error, otherwise 0.
|
|
**/
|
|
int mdev_register_driver(struct mdev_driver *drv, struct module *owner)
|
|
{
|
|
/* initialize common driver fields */
|
|
drv->driver.name = drv->name;
|
|
drv->driver.bus = &mdev_bus_type;
|
|
drv->driver.owner = owner;
|
|
|
|
/* register with core */
|
|
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);
|
|
|
|
int mdev_bus_register(void)
|
|
{
|
|
return bus_register(&mdev_bus_type);
|
|
}
|
|
|
|
void mdev_bus_unregister(void)
|
|
{
|
|
bus_unregister(&mdev_bus_type);
|
|
}
|