forked from mirrors/linux
d2912cb15b
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>
145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* VFIO based driver for Mediated device
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*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/vfio.h>
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#include <linux/mdev.h>
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#include "mdev_private.h"
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#define DRIVER_VERSION "0.1"
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#define DRIVER_AUTHOR "NVIDIA Corporation"
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#define DRIVER_DESC "VFIO based driver for Mediated device"
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static int vfio_mdev_open(void *device_data)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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int ret;
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if (unlikely(!parent->ops->open))
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return -EINVAL;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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ret = parent->ops->open(mdev);
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if (ret)
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module_put(THIS_MODULE);
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return ret;
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}
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static void vfio_mdev_release(void *device_data)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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if (likely(parent->ops->release))
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parent->ops->release(mdev);
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module_put(THIS_MODULE);
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}
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static long vfio_mdev_unlocked_ioctl(void *device_data,
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unsigned int cmd, unsigned long arg)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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if (unlikely(!parent->ops->ioctl))
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return -EINVAL;
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return parent->ops->ioctl(mdev, cmd, arg);
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}
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static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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if (unlikely(!parent->ops->read))
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return -EINVAL;
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return parent->ops->read(mdev, buf, count, ppos);
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}
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static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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if (unlikely(!parent->ops->write))
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return -EINVAL;
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return parent->ops->write(mdev, buf, count, ppos);
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}
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static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
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{
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struct mdev_device *mdev = device_data;
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struct mdev_parent *parent = mdev->parent;
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if (unlikely(!parent->ops->mmap))
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return -EINVAL;
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return parent->ops->mmap(mdev, vma);
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}
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static const struct vfio_device_ops vfio_mdev_dev_ops = {
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.name = "vfio-mdev",
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.open = vfio_mdev_open,
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.release = vfio_mdev_release,
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.ioctl = vfio_mdev_unlocked_ioctl,
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.read = vfio_mdev_read,
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.write = vfio_mdev_write,
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.mmap = vfio_mdev_mmap,
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};
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static int vfio_mdev_probe(struct device *dev)
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{
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struct mdev_device *mdev = to_mdev_device(dev);
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return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev);
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}
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static void vfio_mdev_remove(struct device *dev)
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{
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vfio_del_group_dev(dev);
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}
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static struct mdev_driver vfio_mdev_driver = {
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.name = "vfio_mdev",
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.probe = vfio_mdev_probe,
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.remove = vfio_mdev_remove,
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};
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static int __init vfio_mdev_init(void)
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{
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return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
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}
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static void __exit vfio_mdev_exit(void)
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{
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mdev_unregister_driver(&vfio_mdev_driver);
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}
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module_init(vfio_mdev_init)
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module_exit(vfio_mdev_exit)
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MODULE_VERSION(DRIVER_VERSION);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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