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TOMOYO Linux Cross Reference
Linux/include/linux/mdev.h

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  1 /* SPDX-License-Identifier: GPL-2.0-only */
  2 /*
  3  * Mediated device definition
  4  *
  5  * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
  6  *     Author: Neo Jia <cjia@nvidia.com>
  7  *             Kirti Wankhede <kwankhede@nvidia.com>
  8  */
  9 
 10 #ifndef MDEV_H
 11 #define MDEV_H
 12 
 13 struct mdev_device;
 14 
 15 /*
 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.
 19  *
 20  * @dev: the mediated device that iommu will isolate.
 21  * @iommu_device: a pci device which represents the iommu for @dev.
 22  *
 23  * Return 0 for success, otherwise negative error value.
 24  */
 25 int mdev_set_iommu_device(struct device *dev, struct device *iommu_device);
 26 
 27 struct device *mdev_get_iommu_device(struct device *dev);
 28 
 29 /**
 30  * struct mdev_parent_ops - Structure to be registered for each parent device to
 31  * register the device to mdev module.
 32  *
 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'
 47  *                      ops.
 48  *                      @mdev: mdev_device device structure which is being
 49  *                             destroyed
 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
 58  *                      @buf: read buffer
 59  *                      @count: number of bytes to read
 60  *                      @ppos: address.
 61  *                      Retuns number on bytes read on success or error.
 62  * @write:              Write emulation callback
 63  *                      @mdev: mediated device structure
 64  *                      @buf: write buffer
 65  *                      @count: number of bytes to be written
 66  *                      @ppos: address.
 67  *                      Retuns number on bytes written on success or error.
 68  * @ioctl:              IOCTL callback
 69  *                      @mdev: mediated device structure
 70  *                      @cmd: ioctl command
 71  *                      @arg: arguments to ioctl
 72  * @mmap:               mmap callback
 73  *                      @mdev: mediated device structure
 74  *                      @vma: vma structure
 75  * Parent device that support mediated device should be registered with mdev
 76  * module with mdev_parent_ops structure.
 77  **/
 78 struct mdev_parent_ops {
 79         struct module   *owner;
 80         const struct attribute_group **dev_attr_groups;
 81         const struct attribute_group **mdev_attr_groups;
 82         struct attribute_group **supported_type_groups;
 83 
 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,
 93                          unsigned long arg);
 94         int     (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
 95 };
 96 
 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);
103 };
104 
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)
114 
115 /**
116  * struct mdev_driver - Mediated device driver
117  * @name: driver name
118  * @probe: called when new device created
119  * @remove: called when device removed
120  * @driver: device driver structure
121  *
122  **/
123 struct mdev_driver {
124         const char *name;
125         int  (*probe)(struct device *dev);
126         void (*remove)(struct device *dev);
127         struct device_driver driver;
128 };
129 
130 #define to_mdev_driver(drv)     container_of(drv, struct mdev_driver, driver)
131 
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);
135 
136 extern struct bus_type mdev_bus_type;
137 
138 int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops);
139 void mdev_unregister_device(struct device *dev);
140 
141 int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
142 void mdev_unregister_driver(struct mdev_driver *drv);
143 
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);
147 
148 #endif /* MDEV_H */
149 

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