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Date: Wed, 26 Oct 2016 06:57:26 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Kirti Wankhede <kwankhede@...dia.com>,
"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
"pbonzini@...hat.com" <pbonzini@...hat.com>,
"kraxel@...hat.com" <kraxel@...hat.com>,
"cjia@...dia.com" <cjia@...dia.com>
CC: "qemu-devel@...gnu.org" <qemu-devel@...gnu.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"Song, Jike" <jike.song@...el.com>,
"bjsdjshi@...ux.vnet.ibm.com" <bjsdjshi@...ux.vnet.ibm.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v9 02/12] vfio: VFIO based driver for Mediated devices
> From: Kirti Wankhede [mailto:kwankhede@...dia.com]
> Sent: Tuesday, October 18, 2016 5:22 AM
>
> vfio_mdev driver registers with mdev core driver.
> MDEV core driver creates mediated device and calls probe routine of
use same case - either 'mdev core' or 'MDEV core'
> 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@...dia.com>
> Signed-off-by: Neo Jia <cjia@...dia.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@...dia.com>
> + * Kirti Wankhede <kwankhede@...dia.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)
likely()
> + 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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