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Edit File: mdev.h

/* SPDX-License-Identifier: GPL-2.0-only */ /* * Mediated device definition * * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. * Author: Neo Jia <cjia@nvidia.com> * Kirti Wankhede <kwankhede@nvidia.com> */ #ifndef MDEV_H #define MDEV_H struct mdev_type; struct mdev_device { struct device dev; guid_t uuid; void *driver_data; struct list_head next; struct mdev_type *type; struct device *iommu_device; bool active; }; static inline struct mdev_device *to_mdev_device(struct device *dev) { return container_of(dev, struct mdev_device, dev); } /* * Called by the parent device driver to set the device which represents * this mdev in iommu protection scope. By default, the iommu device is * NULL, that indicates using vendor defined isolation. * * @dev: the mediated device that iommu will isolate. * @iommu_device: a pci device which represents the iommu for @dev. */ static inline void mdev_set_iommu_device(struct mdev_device *mdev, struct device *iommu_device) { mdev->iommu_device = iommu_device; } static inline struct device *mdev_get_iommu_device(struct mdev_device *mdev) { return mdev->iommu_device; } unsigned int mdev_get_type_group_id(struct mdev_device *mdev); unsigned int mtype_get_type_group_id(struct mdev_type *mtype); struct device *mtype_get_parent_dev(struct mdev_type *mtype); /** * struct mdev_parent_ops - Structure to be registered for each parent device to * register the device to mdev module. * * @owner: The module owner. * @device_driver: Which device driver to probe() on newly created devices * @dev_attr_groups: Attributes of the parent device. * @mdev_attr_groups: Attributes of the mediated device. * @supported_type_groups: Attributes to define supported types. It is mandatory * to provide supported types. * @create: Called to allocate basic resources in parent device's * driver for a particular mediated device. It is * mandatory to provide create ops. * @mdev: mdev_device structure on of mediated device * that is being created * Returns integer: success (0) or error (< 0) * @remove: Called to free resources in parent device's driver for * a mediated device. It is mandatory to provide 'remove' * ops. * @mdev: mdev_device device structure which is being * destroyed * Returns integer: success (0) or error (< 0) * @read: Read emulation callback * @mdev: mediated device structure * @buf: read buffer * @count: number of bytes to read * @ppos: address. * Retuns number on bytes read on success or error. * @write: Write emulation callback * @mdev: mediated device structure * @buf: write buffer * @count: number of bytes to be written * @ppos: address. * Retuns number on bytes written on success or error. * @ioctl: IOCTL callback * @mdev: mediated device structure * @cmd: ioctl command * @arg: arguments to ioctl * @mmap: mmap callback * @mdev: mediated device structure * @vma: vma structure * @request: request callback to release device * @mdev: mediated device structure * @count: request sequence number * Parent device that support mediated device should be registered with mdev * module with mdev_parent_ops structure. **/ struct mdev_parent_ops { struct module *owner; struct mdev_driver *device_driver; const struct attribute_group **dev_attr_groups; const struct attribute_group **mdev_attr_groups; struct attribute_group **supported_type_groups; int (*create)(struct mdev_device *mdev); int (*remove)(struct mdev_device *mdev); int (*open_device)(struct mdev_device *mdev); void (*close_device)(struct mdev_device *mdev); ssize_t (*read)(struct mdev_device *mdev, char __user *buf, size_t count, loff_t *ppos); ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, size_t count, loff_t *ppos); long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, unsigned long arg); int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); void (*request)(struct mdev_device *mdev, unsigned int count); }; /* interface for exporting mdev supported type attributes */ struct mdev_type_attribute { struct attribute attr; ssize_t (*show)(struct mdev_type *mtype, struct mdev_type_attribute *attr, char *buf); ssize_t (*store)(struct mdev_type *mtype, struct mdev_type_attribute *attr, const char *buf, size_t count); }; #define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \ struct mdev_type_attribute mdev_type_attr_##_name = \ __ATTR(_name, _mode, _show, _store) #define MDEV_TYPE_ATTR_RW(_name) \ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name) #define MDEV_TYPE_ATTR_RO(_name) \ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name) #define MDEV_TYPE_ATTR_WO(_name) \ struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name) /** * struct mdev_driver - Mediated device driver * @probe: called when new device created * @remove: called when device removed * @driver: device driver structure * **/ struct mdev_driver { int (*probe)(struct mdev_device *dev); void (*remove)(struct mdev_device *dev); struct device_driver driver; }; static inline void *mdev_get_drvdata(struct mdev_device *mdev) { return mdev->driver_data; } static inline void mdev_set_drvdata(struct mdev_device *mdev, void *data) { mdev->driver_data = data; } static inline const guid_t *mdev_uuid(struct mdev_device *mdev) { return &mdev->uuid; } extern struct bus_type mdev_bus_type; int mdev_register_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); void mdev_unregister_driver(struct mdev_driver *drv); struct device *mdev_parent_dev(struct mdev_device *mdev); static inline struct device *mdev_dev(struct mdev_device *mdev) { return &mdev->dev; } static inline struct mdev_device *mdev_from_dev(struct device *dev) { return dev->bus == &mdev_bus_type ? to_mdev_device(dev) : NULL; } #endif /* MDEV_H */