[linux-block.git] / include / linux / vfio.h

/*
 * VFIO API definition
 *
 * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <alex.williamson@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef VFIO_H
#define VFIO_H


#include <linux/iommu.h>
#include <linux/mm.h>
#include <linux/workqueue.h>
#include <linux/poll.h>
#include <uapi/linux/vfio.h>

/**
 * struct vfio_device_ops - VFIO bus driver device callbacks
 *
 * @open: Called when userspace creates new file descriptor for device
 * @release: Called when userspace releases file descriptor for device
 * @read: Perform read(2) on device file descriptor
 * @write: Perform write(2) on device file descriptor
 * @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
 *         operations documented below
 * @mmap: Perform mmap(2) on a region of the device file descriptor
 * @request: Request for the bus driver to release the device
 */
struct vfio_device_ops {
	char	*name;
	int	(*open)(void *device_data);
	void	(*release)(void *device_data);
	ssize_t	(*read)(void *device_data, char __user *buf,
			size_t count, loff_t *ppos);
	ssize_t	(*write)(void *device_data, const char __user *buf,
			 size_t count, loff_t *size);
	long	(*ioctl)(void *device_data, unsigned int cmd,
			 unsigned long arg);
	int	(*mmap)(void *device_data, struct vm_area_struct *vma);
	void	(*request)(void *device_data, unsigned int count);
};

extern struct iommu_group *vfio_iommu_group_get(struct device *dev);
extern void vfio_iommu_group_put(struct iommu_group *group, struct device *dev);

extern int vfio_add_group_dev(struct device *dev,
			      const struct vfio_device_ops *ops,
			      void *device_data);

extern void *vfio_del_group_dev(struct device *dev);
extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
extern void vfio_device_put(struct vfio_device *device);
extern void *vfio_device_data(struct vfio_device *device);

/**
 * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
 */
struct vfio_iommu_driver_ops {
	char		*name;
	struct module	*owner;
	void		*(*open)(unsigned long arg);
	void		(*release)(void *iommu_data);
	ssize_t		(*read)(void *iommu_data, char __user *buf,
				size_t count, loff_t *ppos);
	ssize_t		(*write)(void *iommu_data, const char __user *buf,
				 size_t count, loff_t *size);
	long		(*ioctl)(void *iommu_data, unsigned int cmd,
				 unsigned long arg);
	int		(*mmap)(void *iommu_data, struct vm_area_struct *vma);
	int		(*attach_group)(void *iommu_data,
					struct iommu_group *group);
	void		(*detach_group)(void *iommu_data,
					struct iommu_group *group);
	int		(*pin_pages)(void *iommu_data, unsigned long *user_pfn,
				     int npage, int prot,
				     unsigned long *phys_pfn);
	int		(*unpin_pages)(void *iommu_data,
				       unsigned long *user_pfn, int npage);
	int		(*register_notifier)(void *iommu_data,
					     struct notifier_block *nb);
	int		(*unregister_notifier)(void *iommu_data,
					       struct notifier_block *nb);
};

extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);

extern void vfio_unregister_iommu_driver(
				const struct vfio_iommu_driver_ops *ops);

/*
 * External user API
 */
extern struct vfio_group *vfio_group_get_external_user(struct file *filep);
extern void vfio_group_put_external_user(struct vfio_group *group);
extern int vfio_external_user_iommu_id(struct vfio_group *group);
extern long vfio_external_check_extension(struct vfio_group *group,
					  unsigned long arg);

#define VFIO_PIN_PAGES_MAX_ENTRIES	(PAGE_SIZE/sizeof(unsigned long))

extern int vfio_pin_pages(struct device *dev, unsigned long *user_pfn,
			  int npage, int prot, unsigned long *phys_pfn);
extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
			    int npage);

#define VFIO_IOMMU_NOTIFY_DMA_UNMAP	(1)

extern int vfio_register_notifier(struct device *dev,
				  struct notifier_block *nb);

extern int vfio_unregister_notifier(struct device *dev,
				    struct notifier_block *nb);

/*
 * Sub-module helpers
 */
struct vfio_info_cap {
	struct vfio_info_cap_header *buf;
	size_t size;
};
extern struct vfio_info_cap_header *vfio_info_cap_add(
		struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);

struct pci_dev;
#ifdef CONFIG_EEH
extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
				       unsigned int cmd,
				       unsigned long arg);
#else
static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
{
}

static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
{
}

static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
					      unsigned int cmd,
					      unsigned long arg)
{
	return -ENOTTY;
}
#endif /* CONFIG_EEH */

/*
 * IRQfd - generic
 */
struct virqfd {
	void			*opaque;
	struct eventfd_ctx	*eventfd;
	int			(*handler)(void *, void *);
	void			(*thread)(void *, void *);
	void			*data;
	struct work_struct	inject;
	wait_queue_t		wait;
	poll_table		pt;
	struct work_struct	shutdown;
	struct virqfd		**pvirqfd;
};

extern int vfio_virqfd_enable(void *opaque,
			      int (*handler)(void *, void *),
			      void (*thread)(void *, void *),
			      void *data, struct virqfd **pvirqfd, int fd);
extern void vfio_virqfd_disable(struct virqfd **pvirqfd);

#endif /* VFIO_H */
Commit	Line	Data
cba3345c AW	1	/*
	2	* VFIO API definition
	3	*
	4	* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
	5	* Author: Alex Williamson <alex.williamson@redhat.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#ifndef VFIO_H
	12	#define VFIO_H
	13
cba3345c AW	14
	15	#include <linux/iommu.h>
	16	#include <linux/mm.h>
7e992d69 AM	17	#include <linux/workqueue.h>
7e992d69 AM	18	#include <linux/poll.h>
607ca46e	19	#include <uapi/linux/vfio.h>
cba3345c AW	20
	21	/**
	22	* struct vfio_device_ops - VFIO bus driver device callbacks
	23	*
	24	* @open: Called when userspace creates new file descriptor for device
	25	* @release: Called when userspace releases file descriptor for device
	26	* @read: Perform read(2) on device file descriptor
	27	* @write: Perform write(2) on device file descriptor
	28	* @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
	29	* operations documented below
	30	* @mmap: Perform mmap(2) on a region of the device file descriptor
13060b64	31	* @request: Request for the bus driver to release the device
cba3345c AW	32	*/
	33	struct vfio_device_ops {
	34	char *name;
	35	int (open)(void device_data);
	36	void (release)(void device_data);
	37	ssize_t (read)(void device_data, char __user *buf,
	38	size_t count, loff_t *ppos);
	39	ssize_t (write)(void device_data, const char __user *buf,
	40	size_t count, loff_t *size);
	41	long (ioctl)(void device_data, unsigned int cmd,
	42	unsigned long arg);
	43	int (mmap)(void device_data, struct vm_area_struct *vma);
13060b64	44	void (request)(void device_data, unsigned int count);
cba3345c AW	45	};
cba3345c AW	46
03a76b60 AW	47	extern struct iommu_group vfio_iommu_group_get(struct device dev);
	48	extern void vfio_iommu_group_put(struct iommu_group group, struct device dev);
	49
cba3345c AW	50	extern int vfio_add_group_dev(struct device *dev,
	51	const struct vfio_device_ops *ops,
	52	void *device_data);
	53
	54	extern void vfio_del_group_dev(struct device dev);
44f50716 VMP	55	extern struct vfio_device vfio_device_get_from_dev(struct device dev);
	56	extern void vfio_device_put(struct vfio_device *device);
	57	extern void vfio_device_data(struct vfio_device device);
cba3345c AW	58
	59	/**
	60	* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
	61	*/
	62	struct vfio_iommu_driver_ops {
	63	char *name;
	64	struct module *owner;
	65	void (open)(unsigned long arg);
	66	void (release)(void iommu_data);
	67	ssize_t (read)(void iommu_data, char __user *buf,
	68	size_t count, loff_t *ppos);
	69	ssize_t (write)(void iommu_data, const char __user *buf,
	70	size_t count, loff_t *size);
	71	long (ioctl)(void iommu_data, unsigned int cmd,
	72	unsigned long arg);
	73	int (mmap)(void iommu_data, struct vm_area_struct *vma);
	74	int (attach_group)(void iommu_data,
	75	struct iommu_group *group);
	76	void (detach_group)(void iommu_data,
	77	struct iommu_group *group);
2169037d KW	78	int (pin_pages)(void iommu_data, unsigned long *user_pfn,
	79	int npage, int prot,
	80	unsigned long *phys_pfn);
	81	int (unpin_pages)(void iommu_data,
	82	unsigned long *user_pfn, int npage);
c086de81 KW	83	int (register_notifier)(void iommu_data,
	84	struct notifier_block *nb);
	85	int (unregister_notifier)(void iommu_data,
	86	struct notifier_block *nb);
cba3345c AW	87	};
	88
	89	extern int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
	90
	91	extern void vfio_unregister_iommu_driver(
	92	const struct vfio_iommu_driver_ops *ops);
	93
6cdd9782 AK	94	/*
	95	* External user API
	96	*/
	97	extern struct vfio_group vfio_group_get_external_user(struct file filep);
	98	extern void vfio_group_put_external_user(struct vfio_group *group);
	99	extern int vfio_external_user_iommu_id(struct vfio_group *group);
88d7ab89 AW	100	extern long vfio_external_check_extension(struct vfio_group *group,
88d7ab89 AW	101	unsigned long arg);
6cdd9782	102
2169037d KW	103	#define VFIO_PIN_PAGES_MAX_ENTRIES (PAGE_SIZE/sizeof(unsigned long))
	104
	105	extern int vfio_pin_pages(struct device dev, unsigned long user_pfn,
	106	int npage, int prot, unsigned long *phys_pfn);
	107	extern int vfio_unpin_pages(struct device dev, unsigned long user_pfn,
	108	int npage);
	109
c086de81 KW	110	#define VFIO_IOMMU_NOTIFY_DMA_UNMAP (1)
	111
	112	extern int vfio_register_notifier(struct device *dev,
	113	struct notifier_block *nb);
	114
	115	extern int vfio_unregister_notifier(struct device *dev,
	116	struct notifier_block *nb);
	117
d7a8d5ed AW	118	/*
	119	* Sub-module helpers
	120	*/
	121	struct vfio_info_cap {
	122	struct vfio_info_cap_header *buf;
	123	size_t size;
	124	};
	125	extern struct vfio_info_cap_header *vfio_info_cap_add(
	126	struct vfio_info_cap *caps, size_t size, u16 id, u16 version);
	127	extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
	128
92d18a68	129	struct pci_dev;
1b69be5e	130	#ifdef CONFIG_EEH
9b936c96	131	extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
1b69be5e GS	132	extern void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
	133	extern long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
	134	unsigned int cmd,
	135	unsigned long arg);
	136	#else
9b936c96	137	static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
1b69be5e	138	{
1b69be5e GS	139	}
	140
	141	static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
	142	{
	143	}
	144
	145	static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
	146	unsigned int cmd,
	147	unsigned long arg)
	148	{
	149	return -ENOTTY;
	150	}
	151	#endif /* CONFIG_EEH */
7e992d69 AM	152
	153	/*
	154	* IRQfd - generic
	155	*/
	156	struct virqfd {
	157	void *opaque;
	158	struct eventfd_ctx *eventfd;
	159	int (handler)(void , void *);
	160	void (thread)(void , void *);
	161	void *data;
	162	struct work_struct inject;
	163	wait_queue_t wait;
	164	poll_table pt;
	165	struct work_struct shutdown;
	166	struct virqfd **pvirqfd;
	167	};
	168
7e992d69 AM	169	extern int vfio_virqfd_enable(void *opaque,
	170	int (handler)(void , void *),
	171	void (thread)(void , void *),
	172	void data, struct virqfd *pvirqfd, int fd);
	173	extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
	174
cba3345c	175	#endif /* VFIO_H */