cregit-Linux how code gets into the kernel

Release 4.10 drivers/iommu/iommu-sysfs.c

Directory: drivers/iommu
/*
 * IOMMU sysfs class support
 *
 * Copyright (C) 2014 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <alex.williamson@redhat.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/module.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 iommu_devices_attr_group = {
	.name = "devices",
	.attrs = devices_attr,
};


static const struct attribute_group *iommu_dev_groups[] = {
	&iommu_devices_attr_group,
	NULL,
};


static void iommu_release_device(struct device *dev) { kfree(dev); }

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alex williamsonalex williamson16100.00%1100.00%
Total16100.00%1100.00%

static struct class iommu_class = { .name = "iommu", .dev_release = iommu_release_device, .dev_groups = iommu_dev_groups, };
static int __init iommu_dev_init(void) { return class_register(&iommu_class); }

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alex williamsonalex williamson16100.00%1100.00%
Total16100.00%1100.00%

postcore_initcall(iommu_dev_init); /* * Create an IOMMU device and return a pointer to it. IOMMU specific * attributes can be provided as an attribute group, allowing a unique * namespace per IOMMU type. */
struct device *iommu_device_create(struct device *parent, void *drvdata, const struct attribute_group **groups, const char *fmt, ...) { struct device *dev; va_list vargs; int ret; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return ERR_PTR(-ENOMEM); device_initialize(dev); dev->class = &iommu_class; dev->parent = parent; dev->groups = groups; dev_set_drvdata(dev, drvdata); va_start(vargs, fmt); ret = kobject_set_name_vargs(&dev->kobj, fmt, vargs); va_end(vargs); if (ret) goto error; ret = device_add(dev); if (ret) goto error; return dev; error: put_device(dev); return ERR_PTR(ret); }

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alex williamsonalex williamson160100.00%1100.00%
Total160100.00%1100.00%


void iommu_device_destroy(struct device *dev) { if (!dev || IS_ERR(dev)) return; device_unregister(dev); }

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alex williamsonalex williamson26100.00%1100.00%
Total26100.00%1100.00%

/* * 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 device *dev, struct device *link) { int ret; if (!dev || IS_ERR(dev)) return -ENODEV; ret = sysfs_add_link_to_group(&dev->kobj, "devices", &link->kobj, dev_name(link)); if (ret) return ret; ret = sysfs_create_link_nowarn(&link->kobj, &dev->kobj, "iommu"); if (ret) sysfs_remove_link_from_group(&dev->kobj, "devices", dev_name(link)); return ret; }

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alex williamsonalex williamson100100.00%1100.00%
Total100100.00%1100.00%


void iommu_device_unlink(struct device *dev, struct device *link) { if (!dev || IS_ERR(dev)) return; sysfs_remove_link(&link->kobj, "iommu"); sysfs_remove_link_from_group(&dev->kobj, "devices", dev_name(link)); }

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alex williamsonalex williamson51100.00%1100.00%
Total51100.00%1100.00%


Overall Contributors

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alex williamsonalex williamson45399.34%150.00%
joerg roedeljoerg roedel30.66%150.00%
Total456100.00%2100.00%
Directory: drivers/iommu
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