linux/drivers/iommu/iommu-sysfs.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  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

  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 #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

131 lines
2.9 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* IOMMU sysfs class support
*
* Copyright (C) 2014 Red Hat, Inc. All rights reserved.
* Author: Alex Williamson <alex.williamson@redhat.com>
*/
#include <linux/device.h>
#include <linux/iommu.h>
#include <linux/init.h>
#include <linux/slab.h>
/*
* We provide a common class "devices" group which initially has no attributes.
* As devices are added to the IOMMU, we'll add links to the group.
*/
static struct attribute *devices_attr[] = {
NULL,
};
static const struct attribute_group devices_attr_group = {
.name = "devices",
.attrs = devices_attr,
};
static const struct attribute_group *dev_groups[] = {
&devices_attr_group,
NULL,
};
static void release_device(struct device *dev)
{
kfree(dev);
}
static struct class iommu_class = {
.name = "iommu",
.dev_release = release_device,
.dev_groups = dev_groups,
};
static int __init iommu_dev_init(void)
{
return class_register(&iommu_class);
}
postcore_initcall(iommu_dev_init);
/*
* Init the struct device for the IOMMU. IOMMU specific attributes can
* be provided as an attribute group, allowing a unique namespace per
* IOMMU type.
*/
int iommu_device_sysfs_add(struct iommu_device *iommu,
struct device *parent,
const struct attribute_group **groups,
const char *fmt, ...)
{
va_list vargs;
int ret;
iommu->dev = kzalloc(sizeof(*iommu->dev), GFP_KERNEL);
if (!iommu->dev)
return -ENOMEM;
device_initialize(iommu->dev);
iommu->dev->class = &iommu_class;
iommu->dev->parent = parent;
iommu->dev->groups = groups;
va_start(vargs, fmt);
ret = kobject_set_name_vargs(&iommu->dev->kobj, fmt, vargs);
va_end(vargs);
if (ret)
goto error;
ret = device_add(iommu->dev);
if (ret)
goto error;
dev_set_drvdata(iommu->dev, iommu);
return 0;
error:
put_device(iommu->dev);
return ret;
}
void iommu_device_sysfs_remove(struct iommu_device *iommu)
{
dev_set_drvdata(iommu->dev, NULL);
device_unregister(iommu->dev);
iommu->dev = NULL;
}
/*
* IOMMU drivers can indicate a device is managed by a given IOMMU using
* this interface. A link to the device will be created in the "devices"
* directory of the IOMMU device in sysfs and an "iommu" link will be
* created under the linked device, pointing back at the IOMMU device.
*/
int iommu_device_link(struct iommu_device *iommu, struct device *link)
{
int ret;
if (!iommu || IS_ERR(iommu))
return -ENODEV;
ret = sysfs_add_link_to_group(&iommu->dev->kobj, "devices",
&link->kobj, dev_name(link));
if (ret)
return ret;
ret = sysfs_create_link_nowarn(&link->kobj, &iommu->dev->kobj, "iommu");
if (ret)
sysfs_remove_link_from_group(&iommu->dev->kobj, "devices",
dev_name(link));
return ret;
}
void iommu_device_unlink(struct iommu_device *iommu, struct device *link)
{
if (!iommu || IS_ERR(iommu))
return;
sysfs_remove_link(&link->kobj, "iommu");
sysfs_remove_link_from_group(&iommu->dev->kobj, "devices", dev_name(link));
}