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    Subject[PATCH v9 02/12] vfio: VFIO based driver for Mediated devices
    Date
    vfio_mdev driver registers with mdev core driver.
    MDEV core driver creates mediated device and calls probe routine of
    vfio_mdev driver for each device.
    Probe routine of vfio_mdev driver adds mediated device to VFIO core module

    This driver forms a shim layer that pass through VFIO devices operations
    to vendor driver for mediated devices.

    Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
    Signed-off-by: Neo Jia <cjia@nvidia.com>
    Change-Id: I583f4734752971d3d112324d69e2508c88f359ec
    ---
    drivers/vfio/mdev/Kconfig | 7 ++
    drivers/vfio/mdev/Makefile | 1 +
    drivers/vfio/mdev/vfio_mdev.c | 148 ++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 156 insertions(+)
    create mode 100644 drivers/vfio/mdev/vfio_mdev.c

    diff --git a/drivers/vfio/mdev/Kconfig b/drivers/vfio/mdev/Kconfig
    index 93addace9a67..6cef0c4d2ceb 100644
    --- a/drivers/vfio/mdev/Kconfig
    +++ b/drivers/vfio/mdev/Kconfig
    @@ -9,3 +9,10 @@ config VFIO_MDEV
    See Documentation/vfio-mdev/vfio-mediated-device.txt for more details.

    If you don't know what do here, say N.
    +
    +config VFIO_MDEV_DEVICE
    + tristate "VFIO support for Mediated devices"
    + depends on VFIO && VFIO_MDEV
    + default n
    + help
    + VFIO based driver for mediated devices.
    diff --git a/drivers/vfio/mdev/Makefile b/drivers/vfio/mdev/Makefile
    index 31bc04801d94..fa2d5ea466ee 100644
    --- a/drivers/vfio/mdev/Makefile
    +++ b/drivers/vfio/mdev/Makefile
    @@ -2,3 +2,4 @@
    mdev-y := mdev_core.o mdev_sysfs.o mdev_driver.o

    obj-$(CONFIG_VFIO_MDEV) += mdev.o
    +obj-$(CONFIG_VFIO_MDEV_DEVICE) += vfio_mdev.o
    diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
    new file mode 100644
    index 000000000000..b7b47604ce7a
    --- /dev/null
    +++ b/drivers/vfio/mdev/vfio_mdev.c
    @@ -0,0 +1,148 @@
    +/*
    + * VFIO based driver for Mediated device
    + *
    + * 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/init.h>
    +#include <linux/module.h>
    +#include <linux/device.h>
    +#include <linux/kernel.h>
    +#include <linux/slab.h>
    +#include <linux/vfio.h>
    +#include <linux/mdev.h>
    +
    +#include "mdev_private.h"
    +
    +#define DRIVER_VERSION "0.1"
    +#define DRIVER_AUTHOR "NVIDIA Corporation"
    +#define DRIVER_DESC "VFIO based driver for Mediated device"
    +
    +static int vfio_mdev_open(void *device_data)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    + int ret;
    +
    + if (unlikely(!parent->ops->open))
    + return -EINVAL;
    +
    + if (!try_module_get(THIS_MODULE))
    + return -ENODEV;
    +
    + ret = parent->ops->open(mdev);
    + if (ret)
    + module_put(THIS_MODULE);
    +
    + return ret;
    +}
    +
    +static void vfio_mdev_release(void *device_data)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    +
    + if (parent->ops->release)
    + parent->ops->release(mdev);
    +
    + module_put(THIS_MODULE);
    +}
    +
    +static long vfio_mdev_unlocked_ioctl(void *device_data,
    + unsigned int cmd, unsigned long arg)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    +
    + if (unlikely(!parent->ops->ioctl))
    + return -EINVAL;
    +
    + return parent->ops->ioctl(mdev, cmd, arg);
    +}
    +
    +static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
    + size_t count, loff_t *ppos)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    +
    + if (unlikely(!parent->ops->read))
    + return -EINVAL;
    +
    + return parent->ops->read(mdev, buf, count, ppos);
    +}
    +
    +static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
    + size_t count, loff_t *ppos)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    +
    + if (unlikely(!parent->ops->write))
    + return -EINVAL;
    +
    + return parent->ops->write(mdev, buf, count, ppos);
    +}
    +
    +static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
    +{
    + struct mdev_device *mdev = device_data;
    + struct parent_device *parent = mdev->parent;
    +
    + if (unlikely(!parent->ops->mmap))
    + return -EINVAL;
    +
    + return parent->ops->mmap(mdev, vma);
    +}
    +
    +static const struct vfio_device_ops vfio_mdev_dev_ops = {
    + .name = "vfio-mdev",
    + .open = vfio_mdev_open,
    + .release = vfio_mdev_release,
    + .ioctl = vfio_mdev_unlocked_ioctl,
    + .read = vfio_mdev_read,
    + .write = vfio_mdev_write,
    + .mmap = vfio_mdev_mmap,
    +};
    +
    +int vfio_mdev_probe(struct device *dev)
    +{
    + struct mdev_device *mdev = to_mdev_device(dev);
    +
    + return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev);
    +}
    +
    +void vfio_mdev_remove(struct device *dev)
    +{
    + vfio_del_group_dev(dev);
    +}
    +
    +struct mdev_driver vfio_mdev_driver = {
    + .name = "vfio_mdev",
    + .probe = vfio_mdev_probe,
    + .remove = vfio_mdev_remove,
    +};
    +
    +static int __init vfio_mdev_init(void)
    +{
    + return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
    +}
    +
    +static void __exit vfio_mdev_exit(void)
    +{
    + mdev_unregister_driver(&vfio_mdev_driver);
    +}
    +
    +module_init(vfio_mdev_init)
    +module_exit(vfio_mdev_exit)
    +
    +MODULE_VERSION(DRIVER_VERSION);
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR(DRIVER_AUTHOR);
    +MODULE_DESCRIPTION(DRIVER_DESC);
    --
    2.7.0
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