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    Subject[PATCH V7 4/6] mdev: introduce virtio device and its device ops
    Date
    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 | 20 ++++
    drivers/vfio/mdev/mdev_private.h | 2 +
    include/linux/mdev.h | 6 ++
    include/linux/mdev_virtio_ops.h | 166 +++++++++++++++++++++++++++++++
    4 files changed, 194 insertions(+)
    create mode 100644 include/linux/mdev_virtio_ops.h

    diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
    index 8d579d7ed82f..95ee4126ff9c 100644
    --- a/drivers/vfio/mdev/mdev_core.c
    +++ b/drivers/vfio/mdev/mdev_core.c
    @@ -76,6 +76,26 @@ const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev)
    }
    EXPORT_SYMBOL(mdev_get_vfio_ops);

    +/* Specify the virtio device ops for the mdev device, this
    + * must be called during create() callback for virtio mdev device.
    + */
    +void mdev_set_virtio_ops(struct mdev_device *mdev,
    + const struct mdev_virtio_device_ops *virtio_ops)
    +{
    + mdev_set_class(mdev, MDEV_CLASS_ID_VIRTIO);
    + mdev->virtio_ops = virtio_ops;
    +}
    +EXPORT_SYMBOL(mdev_set_virtio_ops);
    +
    +/* Get the virtio device ops for the mdev device. */
    +const struct mdev_virtio_device_ops *
    +mdev_get_virtio_ops(struct mdev_device *mdev)
    +{
    + WARN_ON(mdev->class_id != MDEV_CLASS_ID_VIRTIO);
    + return mdev->virtio_ops;
    +}
    +EXPORT_SYMBOL(mdev_get_virtio_ops);
    +
    struct device *mdev_dev(struct mdev_device *mdev)
    {
    return &mdev->dev;
    diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
    index 411227373625..2c74dd032409 100644
    --- a/drivers/vfio/mdev/mdev_private.h
    +++ b/drivers/vfio/mdev/mdev_private.h
    @@ -11,6 +11,7 @@
    #define MDEV_PRIVATE_H

    #include <linux/mdev_vfio_ops.h>
    +#include <linux/mdev_virtio_ops.h>

    int mdev_bus_register(void);
    void mdev_bus_unregister(void);
    @@ -38,6 +39,7 @@ struct mdev_device {
    u16 class_id;
    union {
    const struct mdev_vfio_device_ops *vfio_ops;
    + const struct mdev_virtio_device_ops *virtio_ops;
    };
    };

    diff --git a/include/linux/mdev.h b/include/linux/mdev.h
    index 9e37506d1987..f3d75a60c2b5 100644
    --- a/include/linux/mdev.h
    +++ b/include/linux/mdev.h
    @@ -17,6 +17,7 @@

    struct mdev_device;
    struct mdev_vfio_device_ops;
    +struct mdev_virtio_device_ops;

    /*
    * Called by the parent device driver to set the device which represents
    @@ -112,6 +113,10 @@ void mdev_set_class(struct mdev_device *mdev, u16 id);
    void mdev_set_vfio_ops(struct mdev_device *mdev,
    const struct mdev_vfio_device_ops *vfio_ops);
    const struct mdev_vfio_device_ops *mdev_get_vfio_ops(struct mdev_device *mdev);
    +void mdev_set_virtio_ops(struct mdev_device *mdev,
    + const struct mdev_virtio_device_ops *virtio_ops);
    +const struct mdev_virtio_device_ops *
    +mdev_get_virtio_ops(struct mdev_device *mdev);

    extern struct bus_type mdev_bus_type;

    @@ -127,6 +132,7 @@ struct mdev_device *mdev_from_dev(struct device *dev);

    enum {
    MDEV_CLASS_ID_VFIO = 1,
    + MDEV_CLASS_ID_VIRTIO = 2,
    /* New entries must be added here */
    };

    diff --git a/include/linux/mdev_virtio_ops.h b/include/linux/mdev_virtio_ops.h
    new file mode 100644
    index 000000000000..0dcae7fa31e5
    --- /dev/null
    +++ b/include/linux/mdev_virtio_ops.h
    @@ -0,0 +1,166 @@
    +/* SPDX-License-Identifier: GPL-2.0-only */
    +/*
    + * Virtio mediated device driver
    + *
    + * Copyright 2019, Red Hat Corp.
    + * Author: Jason Wang <jasowang@redhat.com>
    + */
    +#ifndef MDEV_VIRTIO_OPS_H
    +#define MDEV_VIRTIO_OPS_H
    +
    +#include <linux/interrupt.h>
    +#include <linux/mdev.h>
    +#include <uapi/linux/vhost.h>
    +
    +#define VIRTIO_MDEV_DEVICE_API_STRING "virtio-mdev"
    +#define VIRTIO_MDEV_F_VERSION_1 0x1
    +
    +struct virtio_mdev_callback {
    + irqreturn_t (*callback)(void *data);
    + void *private;
    +};
    +
    +/**
    + * struct mdev_virtio_device_ops - Structure to be registered for each
    + * mdev device to register the device for virtio/vhost drivers.
    + *
    + * The device ops that is supported by VIRTIO_MDEV_F_VERSION_1, the
    + * callbacks are mandatory unless explicity mentioned.
    + *
    + * @get_mdev_features: Get a set of bits that demonstrate
    + * the capability of the mdev device. New
    + * feature bits must be added when
    + * introducing new device ops. This
    + * allows the device ops to be extended
    + * (one feature could have N new ops).
    + * @mdev: mediated device
    + * Returns the mdev features (API) support by
    + * the device.
    + * @get_mdev_features: Set a set of features that will be
    + * used by the driver.
    + * @features: features used by the driver
    + * Returns bollean: whether the features
    + * is accepted by the device.
    + * @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 interrupt callback 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 virtio features support by the
    + * device
    + * @set_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_vq_num_max: Get the max size of virtqueue
    + * @mdev: mediated device
    + * Returns u16: max size of virtqueue
    + * @get_device_id: Get virtio device id
    + * @mdev: mediated device
    + * Returns u32: virtio device id
    + * @get_vendor_id: Get id for the vendor that provides this device
    + * @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 configuration 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 configuration 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_generation: Get device config generaton (optional)
    + * @mdev: mediated device
    + * Returns u32: device generation
    + */
    +struct mdev_virtio_device_ops {
    + /* Mdev device ops */
    + u64 (*get_mdev_features)(struct mdev_device *mdev);
    + bool (*set_mdev_feature)(struct mdev_device *mdev);
    + /* 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);
    +
    + /* Virtio 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_vq_num_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);
    + u32 (*get_generation)(struct mdev_device *mdev);
    +};
    +
    +void mdev_set_virtio_ops(struct mdev_device *mdev,
    + const struct mdev_virtio_device_ops *virtio_ops);
    +
    +#endif
    --
    2.19.1
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      Last update: 2019-11-04 13:48    [W:4.290 / U:0.588 seconds]
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