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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - include/linux/mdev.h
1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Mediated device definition
5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
6 * Author: Neo Jia <cjia@nvidia.com>
7 * Kirti Wankhede <kwankhede@nvidia.com>
16 * Called by the parent device driver to set the device which represents
17 * this mdev in iommu protection scope. By default, the iommu device is
18 * NULL, that indicates using vendor defined isolation.
20 * @dev: the mediated device that iommu will isolate.
21 * @iommu_device: a pci device which represents the iommu for @dev.
23 * Return 0 for success, otherwise negative error value.
25 int mdev_set_iommu_device(struct device
*dev
, struct device
*iommu_device
);
27 struct device
*mdev_get_iommu_device(struct device
*dev
);
30 * struct mdev_parent_ops - Structure to be registered for each parent device to
31 * register the device to mdev module.
33 * @owner: The module owner.
34 * @dev_attr_groups: Attributes of the parent device.
35 * @mdev_attr_groups: Attributes of the mediated device.
36 * @supported_type_groups: Attributes to define supported types. It is mandatory
37 * to provide supported types.
38 * @create: Called to allocate basic resources in parent device's
39 * driver for a particular mediated device. It is
40 * mandatory to provide create ops.
41 * @kobj: kobject of type for which 'create' is called.
42 * @mdev: mdev_device structure on of mediated device
43 * that is being created
44 * Returns integer: success (0) or error (< 0)
45 * @remove: Called to free resources in parent device's driver for a
46 * a mediated device. It is mandatory to provide 'remove'
48 * @mdev: mdev_device device structure which is being
50 * Returns integer: success (0) or error (< 0)
51 * @open: Open mediated device.
52 * @mdev: mediated device.
53 * Returns integer: success (0) or error (< 0)
54 * @release: release mediated device
55 * @mdev: mediated device.
56 * @read: Read emulation callback
57 * @mdev: mediated device structure
59 * @count: number of bytes to read
61 * Retuns number on bytes read on success or error.
62 * @write: Write emulation callback
63 * @mdev: mediated device structure
65 * @count: number of bytes to be written
67 * Retuns number on bytes written on success or error.
68 * @ioctl: IOCTL callback
69 * @mdev: mediated device structure
71 * @arg: arguments to ioctl
72 * @mmap: mmap callback
73 * @mdev: mediated device structure
75 * Parent device that support mediated device should be registered with mdev
76 * module with mdev_parent_ops structure.
78 struct mdev_parent_ops
{
80 const struct attribute_group
**dev_attr_groups
;
81 const struct attribute_group
**mdev_attr_groups
;
82 struct attribute_group
**supported_type_groups
;
84 int (*create
)(struct kobject
*kobj
, struct mdev_device
*mdev
);
85 int (*remove
)(struct mdev_device
*mdev
);
86 int (*open
)(struct mdev_device
*mdev
);
87 void (*release
)(struct mdev_device
*mdev
);
88 ssize_t (*read
)(struct mdev_device
*mdev
, char __user
*buf
,
89 size_t count
, loff_t
*ppos
);
90 ssize_t (*write
)(struct mdev_device
*mdev
, const char __user
*buf
,
91 size_t count
, loff_t
*ppos
);
92 long (*ioctl
)(struct mdev_device
*mdev
, unsigned int cmd
,
94 int (*mmap
)(struct mdev_device
*mdev
, struct vm_area_struct
*vma
);
97 /* interface for exporting mdev supported type attributes */
98 struct mdev_type_attribute
{
99 struct attribute attr
;
100 ssize_t (*show
)(struct kobject
*kobj
, struct device
*dev
, char *buf
);
101 ssize_t (*store
)(struct kobject
*kobj
, struct device
*dev
,
102 const char *buf
, size_t count
);
105 #define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \
106 struct mdev_type_attribute mdev_type_attr_##_name = \
107 __ATTR(_name, _mode, _show, _store)
108 #define MDEV_TYPE_ATTR_RW(_name) \
109 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name)
110 #define MDEV_TYPE_ATTR_RO(_name) \
111 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
112 #define MDEV_TYPE_ATTR_WO(_name) \
113 struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
116 * struct mdev_driver - Mediated device driver
118 * @probe: called when new device created
119 * @remove: called when device removed
120 * @driver: device driver structure
125 int (*probe
)(struct device
*dev
);
126 void (*remove
)(struct device
*dev
);
127 struct device_driver driver
;
130 #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
132 void *mdev_get_drvdata(struct mdev_device
*mdev
);
133 void mdev_set_drvdata(struct mdev_device
*mdev
, void *data
);
134 const guid_t
*mdev_uuid(struct mdev_device
*mdev
);
136 extern struct bus_type mdev_bus_type
;
138 int mdev_register_device(struct device
*dev
, const struct mdev_parent_ops
*ops
);
139 void mdev_unregister_device(struct device
*dev
);
141 int mdev_register_driver(struct mdev_driver
*drv
, struct module
*owner
);
142 void mdev_unregister_driver(struct mdev_driver
*drv
);
144 struct device
*mdev_parent_dev(struct mdev_device
*mdev
);
145 struct device
*mdev_dev(struct mdev_device
*mdev
);
146 struct mdev_device
*mdev_from_dev(struct device
*dev
);