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7b96953b KW |
1 | /* |
2 | * Mediated device definition | |
3 | * | |
4 | * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. | |
5 | * Author: Neo Jia <cjia@nvidia.com> | |
6 | * Kirti Wankhede <kwankhede@nvidia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #ifndef MDEV_H | |
14 | #define MDEV_H | |
15 | ||
99e3123e | 16 | struct mdev_device; |
7b96953b | 17 | |
8ac13175 LB |
18 | /* |
19 | * Called by the parent device driver to set the device which represents | |
20 | * this mdev in iommu protection scope. By default, the iommu device is | |
21 | * NULL, that indicates using vendor defined isolation. | |
22 | * | |
23 | * @dev: the mediated device that iommu will isolate. | |
24 | * @iommu_device: a pci device which represents the iommu for @dev. | |
25 | * | |
26 | * Return 0 for success, otherwise negative error value. | |
27 | */ | |
28 | int mdev_set_iommu_device(struct device *dev, struct device *iommu_device); | |
29 | ||
30 | struct device *mdev_get_iommu_device(struct device *dev); | |
31 | ||
7b96953b | 32 | /** |
42930553 | 33 | * struct mdev_parent_ops - Structure to be registered for each parent device to |
7b96953b KW |
34 | * register the device to mdev module. |
35 | * | |
36 | * @owner: The module owner. | |
37 | * @dev_attr_groups: Attributes of the parent device. | |
38 | * @mdev_attr_groups: Attributes of the mediated device. | |
39 | * @supported_type_groups: Attributes to define supported types. It is mandatory | |
40 | * to provide supported types. | |
41 | * @create: Called to allocate basic resources in parent device's | |
42 | * driver for a particular mediated device. It is | |
43 | * mandatory to provide create ops. | |
44 | * @kobj: kobject of type for which 'create' is called. | |
45 | * @mdev: mdev_device structure on of mediated device | |
46 | * that is being created | |
47 | * Returns integer: success (0) or error (< 0) | |
48 | * @remove: Called to free resources in parent device's driver for a | |
49 | * a mediated device. It is mandatory to provide 'remove' | |
50 | * ops. | |
51 | * @mdev: mdev_device device structure which is being | |
52 | * destroyed | |
53 | * Returns integer: success (0) or error (< 0) | |
54 | * @open: Open mediated device. | |
55 | * @mdev: mediated device. | |
56 | * Returns integer: success (0) or error (< 0) | |
57 | * @release: release mediated device | |
58 | * @mdev: mediated device. | |
59 | * @read: Read emulation callback | |
60 | * @mdev: mediated device structure | |
61 | * @buf: read buffer | |
62 | * @count: number of bytes to read | |
63 | * @ppos: address. | |
64 | * Retuns number on bytes read on success or error. | |
65 | * @write: Write emulation callback | |
66 | * @mdev: mediated device structure | |
67 | * @buf: write buffer | |
68 | * @count: number of bytes to be written | |
69 | * @ppos: address. | |
70 | * Retuns number on bytes written on success or error. | |
71 | * @ioctl: IOCTL callback | |
72 | * @mdev: mediated device structure | |
73 | * @cmd: ioctl command | |
74 | * @arg: arguments to ioctl | |
75 | * @mmap: mmap callback | |
76 | * @mdev: mediated device structure | |
77 | * @vma: vma structure | |
78 | * Parent device that support mediated device should be registered with mdev | |
42930553 | 79 | * module with mdev_parent_ops structure. |
7b96953b | 80 | **/ |
42930553 | 81 | struct mdev_parent_ops { |
7b96953b KW |
82 | struct module *owner; |
83 | const struct attribute_group **dev_attr_groups; | |
84 | const struct attribute_group **mdev_attr_groups; | |
85 | struct attribute_group **supported_type_groups; | |
86 | ||
87 | int (*create)(struct kobject *kobj, struct mdev_device *mdev); | |
88 | int (*remove)(struct mdev_device *mdev); | |
89 | int (*open)(struct mdev_device *mdev); | |
90 | void (*release)(struct mdev_device *mdev); | |
91 | ssize_t (*read)(struct mdev_device *mdev, char __user *buf, | |
92 | size_t count, loff_t *ppos); | |
93 | ssize_t (*write)(struct mdev_device *mdev, const char __user *buf, | |
94 | size_t count, loff_t *ppos); | |
c6ef7fd4 | 95 | long (*ioctl)(struct mdev_device *mdev, unsigned int cmd, |
7b96953b KW |
96 | unsigned long arg); |
97 | int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma); | |
98 | }; | |
99 | ||
100 | /* interface for exporting mdev supported type attributes */ | |
101 | struct mdev_type_attribute { | |
102 | struct attribute attr; | |
103 | ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf); | |
104 | ssize_t (*store)(struct kobject *kobj, struct device *dev, | |
105 | const char *buf, size_t count); | |
106 | }; | |
107 | ||
108 | #define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \ | |
109 | struct mdev_type_attribute mdev_type_attr_##_name = \ | |
110 | __ATTR(_name, _mode, _show, _store) | |
111 | #define MDEV_TYPE_ATTR_RW(_name) \ | |
112 | struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name) | |
113 | #define MDEV_TYPE_ATTR_RO(_name) \ | |
114 | struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name) | |
115 | #define MDEV_TYPE_ATTR_WO(_name) \ | |
116 | struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name) | |
117 | ||
118 | /** | |
119 | * struct mdev_driver - Mediated device driver | |
120 | * @name: driver name | |
121 | * @probe: called when new device created | |
122 | * @remove: called when device removed | |
123 | * @driver: device driver structure | |
124 | * | |
125 | **/ | |
126 | struct mdev_driver { | |
127 | const char *name; | |
128 | int (*probe)(struct device *dev); | |
129 | void (*remove)(struct device *dev); | |
130 | struct device_driver driver; | |
131 | }; | |
132 | ||
133 | #define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver) | |
7b96953b | 134 | |
50732af3 PP |
135 | void *mdev_get_drvdata(struct mdev_device *mdev); |
136 | void mdev_set_drvdata(struct mdev_device *mdev, void *data); | |
137 | const guid_t *mdev_uuid(struct mdev_device *mdev); | |
7b96953b KW |
138 | |
139 | extern struct bus_type mdev_bus_type; | |
140 | ||
50732af3 PP |
141 | int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops); |
142 | void mdev_unregister_device(struct device *dev); | |
7b96953b | 143 | |
50732af3 PP |
144 | int mdev_register_driver(struct mdev_driver *drv, struct module *owner); |
145 | void mdev_unregister_driver(struct mdev_driver *drv); | |
7b96953b | 146 | |
50732af3 PP |
147 | struct device *mdev_parent_dev(struct mdev_device *mdev); |
148 | struct device *mdev_dev(struct mdev_device *mdev); | |
149 | struct mdev_device *mdev_from_dev(struct device *dev); | |
9372e6fe | 150 | |
7b96953b | 151 | #endif /* MDEV_H */ |