forked from mirrors/linux
c6ef7fd40e
What appears to be a copy and paste error from the line above gets
the ioctl a ssize_t return value instead of the traditional "int".
The associated sample code used "long" which meant it would compile
for x86-64 but not i386, with the latter failing as follows:
CC [M] samples/vfio-mdev/mtty.o
samples/vfio-mdev/mtty.c:1418:20: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
.ioctl = mtty_ioctl,
^
samples/vfio-mdev/mtty.c:1418:20: note: (near initialization for ‘mdev_fops.ioctl’)
cc1: some warnings being treated as errors
Since in this case, vfio is working with struct file_operations; as such:
long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long);
long (*compat_ioctl) (struct file *, unsigned int, unsigned long);
...and so here we just standardize on long vs. the normal int that user
space typically sees and documents as per "man ioctl" and similar.
Fixes: 9d1a546c53 ("docs: Sample driver to demonstrate how to use Mediated device framework.")
Cc: Kirti Wankhede <kwankhede@nvidia.com>
Cc: Neo Jia <cjia@nvidia.com>
Cc: kvm@vger.kernel.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
138 lines
4.9 KiB
C
138 lines
4.9 KiB
C
/*
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* Mediated device definition
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*
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* Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
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* Author: Neo Jia <cjia@nvidia.com>
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* Kirti Wankhede <kwankhede@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef MDEV_H
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#define MDEV_H
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struct mdev_device;
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/**
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* struct mdev_parent_ops - Structure to be registered for each parent device to
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* register the device to mdev module.
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*
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* @owner: The module owner.
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* @dev_attr_groups: Attributes of the parent device.
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* @mdev_attr_groups: Attributes of the mediated device.
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* @supported_type_groups: Attributes to define supported types. It is mandatory
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* to provide supported types.
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* @create: Called to allocate basic resources in parent device's
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* driver for a particular mediated device. It is
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* mandatory to provide create ops.
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* @kobj: kobject of type for which 'create' is called.
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* @mdev: mdev_device structure on of mediated device
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* that is being created
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* Returns integer: success (0) or error (< 0)
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* @remove: Called to free resources in parent device's driver for a
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* a mediated device. It is mandatory to provide 'remove'
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* ops.
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* @mdev: mdev_device device structure which is being
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* destroyed
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* Returns integer: success (0) or error (< 0)
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* @open: Open mediated device.
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* @mdev: mediated device.
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* Returns integer: success (0) or error (< 0)
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* @release: release mediated device
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* @mdev: mediated device.
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* @read: Read emulation callback
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* @mdev: mediated device structure
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* @buf: read buffer
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* @count: number of bytes to read
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* @ppos: address.
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* Retuns number on bytes read on success or error.
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* @write: Write emulation callback
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* @mdev: mediated device structure
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* @buf: write buffer
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* @count: number of bytes to be written
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* @ppos: address.
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* Retuns number on bytes written on success or error.
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* @ioctl: IOCTL callback
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* @mdev: mediated device structure
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* @cmd: ioctl command
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* @arg: arguments to ioctl
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* @mmap: mmap callback
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* @mdev: mediated device structure
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* @vma: vma structure
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* Parent device that support mediated device should be registered with mdev
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* module with mdev_parent_ops structure.
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**/
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struct mdev_parent_ops {
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struct module *owner;
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const struct attribute_group **dev_attr_groups;
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const struct attribute_group **mdev_attr_groups;
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struct attribute_group **supported_type_groups;
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int (*create)(struct kobject *kobj, struct mdev_device *mdev);
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int (*remove)(struct mdev_device *mdev);
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int (*open)(struct mdev_device *mdev);
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void (*release)(struct mdev_device *mdev);
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ssize_t (*read)(struct mdev_device *mdev, char __user *buf,
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size_t count, loff_t *ppos);
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ssize_t (*write)(struct mdev_device *mdev, const char __user *buf,
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size_t count, loff_t *ppos);
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long (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
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unsigned long arg);
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int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
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};
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/* interface for exporting mdev supported type attributes */
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struct mdev_type_attribute {
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struct attribute attr;
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ssize_t (*show)(struct kobject *kobj, struct device *dev, char *buf);
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ssize_t (*store)(struct kobject *kobj, struct device *dev,
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const char *buf, size_t count);
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};
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#define MDEV_TYPE_ATTR(_name, _mode, _show, _store) \
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struct mdev_type_attribute mdev_type_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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#define MDEV_TYPE_ATTR_RW(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RW(_name)
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#define MDEV_TYPE_ATTR_RO(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_RO(_name)
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#define MDEV_TYPE_ATTR_WO(_name) \
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struct mdev_type_attribute mdev_type_attr_##_name = __ATTR_WO(_name)
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/**
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* struct mdev_driver - Mediated device driver
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* @name: driver name
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* @probe: called when new device created
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* @remove: called when device removed
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* @driver: device driver structure
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*
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**/
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struct mdev_driver {
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const char *name;
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int (*probe)(struct device *dev);
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void (*remove)(struct device *dev);
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struct device_driver driver;
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};
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#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
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extern void *mdev_get_drvdata(struct mdev_device *mdev);
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extern void mdev_set_drvdata(struct mdev_device *mdev, void *data);
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extern uuid_le mdev_uuid(struct mdev_device *mdev);
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extern struct bus_type mdev_bus_type;
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extern int mdev_register_device(struct device *dev,
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const struct mdev_parent_ops *ops);
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extern void mdev_unregister_device(struct device *dev);
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extern int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
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extern void mdev_unregister_driver(struct mdev_driver *drv);
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extern struct device *mdev_parent_dev(struct mdev_device *mdev);
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extern struct device *mdev_dev(struct mdev_device *mdev);
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extern struct mdev_device *mdev_from_dev(struct device *dev);
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#endif /* MDEV_H */
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