This patch implements basic support for mdev driver that supports virtio transport for kernel virtio driver.
Signed-off-by: Jason Wang jasowang@redhat.com --- drivers/vfio/mdev/mdev_core.c | 7 ++ include/linux/mdev.h | 4 + include/linux/virtio_mdev.h | 144 ++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 include/linux/virtio_mdev.h
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c index a02c256a3514..6d39caf96222 100644 --- a/drivers/vfio/mdev/mdev_core.c +++ b/drivers/vfio/mdev/mdev_core.c @@ -220,6 +220,13 @@ int mdev_register_vfio_device(struct device *dev, } EXPORT_SYMBOL(mdev_register_vfio_device);
+int mdev_register_virtio_device(struct device *dev, + const struct mdev_parent_ops *ops) +{ + return mdev_register_device(dev, ops, MDEV_ID_VIRTIO); +} +EXPORT_SYMBOL(mdev_register_virtio_device); + /* * mdev_unregister_device : Unregister a parent device * @dev: device structure representing parent device. diff --git a/include/linux/mdev.h b/include/linux/mdev.h index fa167bcb81e1..1d061739021e 100644 --- a/include/linux/mdev.h +++ b/include/linux/mdev.h @@ -109,6 +109,8 @@ extern struct bus_type mdev_bus_type;
int mdev_register_vfio_device(struct device *dev, const struct mdev_parent_ops *ops); +int mdev_register_virtio_device(struct device *dev, + const struct mdev_parent_ops *ops); void mdev_unregister_device(struct device *dev);
int mdev_register_driver(struct mdev_driver *drv, struct module *owner); @@ -119,5 +121,7 @@ struct device *mdev_dev(struct mdev_device *mdev); struct mdev_device *mdev_from_dev(struct device *dev);
#define MDEV_ID_VFIO 1 /* VFIO device */ +#define MDEV_ID_VIRTIO 2 /* Virtio Device */ +#define MDEV_ID_VHOST 3 /* Vhost Device */
#endif /* MDEV_H */ diff --git a/include/linux/virtio_mdev.h b/include/linux/virtio_mdev.h new file mode 100644 index 000000000000..f8db03c93d36 --- /dev/null +++ b/include/linux/virtio_mdev.h @@ -0,0 +1,144 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Virtio mediated device driver + * + * Copyright 2019, Red Hat Corp. + * Author: Jason Wang jasowang@redhat.com + */ +#ifndef _LINUX_VIRTIO_MDEV_H +#define _LINUX_VIRTIO_MDEV_H + +#include <linux/interrupt.h> +#include <uapi/linux/vhost.h> + +#define VIRTIO_MDEV_DEVICE_API_STRING "virtio-mdev" +#define VIRTIO_MDEV_VERSION 0x1 + +struct virtio_mdev_callback { + irqreturn_t (*callback)(void *data); + void *private; +}; + +/** + * struct vfio_mdev_parent_ops - Structure to be registered for each + * parent device to register the device to virtio-mdev module. + * + * @set_vq_address: Set the address of virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @desc_area: address of desc area + * @driver_area: address of driver area + * @device_area: address of device area + * Returns integer: success (0) or error (< 0) + * @set_vq_num: Set the size of virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @num: the size of virtqueue + * @kick_vq: Kick the virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @set_vq_cb: Set the interrut calback function for + * a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @cb: virtio-mdev interrupt callback structure + * @set_vq_ready: Set ready status for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @ready: ready (true) not ready(false) + * @get_vq_ready: Get ready status for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * Returns boolean: ready (true) or not (false) + * @set_vq_state: Set the state for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * @state: virtqueue state (last_avail_idx) + * Returns integer: success (0) or error (< 0) + * @get_vq_state: Get the state for a virtqueue + * @mdev: mediated device + * @idx: virtqueue index + * Returns virtqueue state (last_avail_idx) + * @get_vq_align: Get the virtqueue align requirement + * for the device + * @mdev: mediated device + * Returns virtqueue algin requirement + * @get_features: Get virtio features supported by the device + * @mdev: mediated device + * Returns the features support by the + * device + * @get_features: Set virtio features supported by the driver + * @mdev: mediated device + * @features: feature support by the driver + * Returns integer: success (0) or error (< 0) + * @set_config_cb: Set the config interrupt callback + * @mdev: mediated device + * @cb: virtio-mdev interrupt callback structure + * @get_device_id: Get virtio device id + * @mdev: mediated device + * Returns u32: virtio device id + * @get_vendor_id: Get virtio vendor id + * @mdev: mediated device + * Returns u32: virtio vendor id + * @get_status: Get the device status + * @mdev: mediated device + * Returns u8: virtio device status + * @set_status: Set the device status + * @mdev: mediated device + * @status: virtio device status + * @get_config: Read from device specific confiugration space + * @mdev: mediated device + * @offset: offset from the beginning of + * configuration space + * @buf: buffer used to read to + * @len: the length to read from + * configration space + * @set_config: Write to device specific confiugration space + * @mdev: mediated device + * @offset: offset from the beginning of + * configuration space + * @buf: buffer used to write from + * @len: the length to write to + * configration space + * @get_version: Get the version of virtio mdev device + * @mdev: mediated device + * Returns integer: version of the device + * @get_generation: Get device generaton + * @mdev: mediated device + * Returns u32: device generation + */ +struct virtio_mdev_parent_ops { + /* Virtqueue ops */ + int (*set_vq_address)(struct mdev_device *mdev, + u16 idx, u64 desc_area, u64 driver_area, + u64 device_area); + void (*set_vq_num)(struct mdev_device *mdev, u16 idx, u32 num); + void (*kick_vq)(struct mdev_device *mdev, u16 idx); + void (*set_vq_cb)(struct mdev_device *mdev, u16 idx, + struct virtio_mdev_callback *cb); + void (*set_vq_ready)(struct mdev_device *mdev, u16 idx, bool ready); + bool (*get_vq_ready)(struct mdev_device *mdev, u16 idx); + int (*set_vq_state)(struct mdev_device *mdev, u16 idx, u64 state); + u64 (*get_vq_state)(struct mdev_device *mdev, u16 idx); + + /* Device ops */ + u16 (*get_vq_align)(struct mdev_device *mdev); + u64 (*get_features)(struct mdev_device *mdev); + int (*set_features)(struct mdev_device *mdev, u64 features); + void (*set_config_cb)(struct mdev_device *mdev, + struct virtio_mdev_callback *cb); + u16 (*get_queue_max)(struct mdev_device *mdev); + u32 (*get_device_id)(struct mdev_device *mdev); + u32 (*get_vendor_id)(struct mdev_device *mdev); + u8 (*get_status)(struct mdev_device *mdev); + void (*set_status)(struct mdev_device *mdev, u8 status); + void (*get_config)(struct mdev_device *mdev, unsigned int offset, + void *buf, unsigned int len); + void (*set_config)(struct mdev_device *mdev, unsigned int offset, + const void *buf, unsigned int len); + int (*get_version)(struct mdev_device *mdev); + u32 (*get_generation)(struct mdev_device *mdev); +}; + +#endif +