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

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * VFIO API definition
 *
 * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <alex.williamson@redhat.com>
 */
#ifndef VFIO_H
#define VFIO_H


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

struct kvm;
struct iommufd_ctx;
struct iommufd_device;
struct iommufd_access;

/*
 * VFIO devices can be placed in a set, this allows all devices to share this
 * structure and the VFIO core will provide a lock that is held around
 * open_device()/close_device() for all devices in the set.
 */
struct vfio_device_set {
	void *set_id;
	struct mutex lock;
	struct list_head device_list;
	unsigned int device_count;
};

struct vfio_device {
	struct device *dev;
	const struct vfio_device_ops *ops;
	/*
	 * mig_ops/log_ops is a static property of the vfio_device which must
	 * be set prior to registering the vfio_device.
	 */
	const struct vfio_migration_ops *mig_ops;
	const struct vfio_log_ops *log_ops;
#if IS_ENABLED(CONFIG_VFIO_GROUP)
	struct vfio_group *group;
	struct list_head group_next;
	struct list_head iommu_entry;
#endif
	struct vfio_device_set *dev_set;
	struct list_head dev_set_list;
	unsigned int migration_flags;
	struct kvm *kvm;

	/* Members below here are private, not for driver use */
	unsigned int index;
	struct device device;	/* device.kref covers object life circle */
#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
	struct cdev cdev;
#endif
	refcount_t refcount;	/* user count on registered device*/
	unsigned int open_count;
	struct completion comp;
	struct iommufd_access *iommufd_access;
	void (*put_kvm)(struct kvm *kvm);
	struct inode *inode;
#if IS_ENABLED(CONFIG_IOMMUFD)
	struct iommufd_device *iommufd_device;
	struct ida pasids;
	u8 iommufd_attached:1;
#endif
	u8 cdev_opened:1;
#ifdef CONFIG_DEBUG_FS
	/*
	 * debug_root is a static property of the vfio_device
	 * which must be set prior to registering the vfio_device.
	 */
	struct dentry *debug_root;
#endif
};

/**
 * struct vfio_device_ops - VFIO bus driver device callbacks
 *
 * @name: Name of the device driver.
 * @init: initialize private fields in device structure
 * @release: Reclaim private fields in device structure
 * @bind_iommufd: Called when binding the device to an iommufd
 * @unbind_iommufd: Opposite of bind_iommufd
 * @attach_ioas: Called when attaching device to an IOAS/HWPT managed by the
 *		 bound iommufd. Undo in unbind_iommufd if @detach_ioas is not
 *		 called.
 * @detach_ioas: Opposite of attach_ioas
 * @pasid_attach_ioas: The pasid variation of attach_ioas
 * @pasid_detach_ioas: Opposite of pasid_attach_ioas
 * @open_device: Called when the first file descriptor is opened for this device
 * @close_device: Opposite of open_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
 * @match: Optional device name match callback (return: 0 for no-match, >0 for
 *         match, -errno for abort (ex. match with insufficient or incorrect
 *         additional args)
 * @dma_unmap: Called when userspace unmaps IOVA from the container
 *             this device is attached to.
 * @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl
 */
struct vfio_device_ops {
	char	*name;
	int	(*init)(struct vfio_device *vdev);
	void	(*release)(struct vfio_device *vdev);
	int	(*bind_iommufd)(struct vfio_device *vdev,
				struct iommufd_ctx *ictx, u32 *out_device_id);
	void	(*unbind_iommufd)(struct vfio_device *vdev);
	int	(*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
	void	(*detach_ioas)(struct vfio_device *vdev);
	int	(*pasid_attach_ioas)(struct vfio_device *vdev, u32 pasid,
				     u32 *pt_id);
	void	(*pasid_detach_ioas)(struct vfio_device *vdev, u32 pasid);
	int	(*open_device)(struct vfio_device *vdev);
	void	(*close_device)(struct vfio_device *vdev);
	ssize_t	(*read)(struct vfio_device *vdev, char __user *buf,
			size_t count, loff_t *ppos);
	ssize_t	(*write)(struct vfio_device *vdev, const char __user *buf,
			 size_t count, loff_t *size);
	long	(*ioctl)(struct vfio_device *vdev, unsigned int cmd,
			 unsigned long arg);
	int	(*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
	void	(*request)(struct vfio_device *vdev, unsigned int count);
	int	(*match)(struct vfio_device *vdev, char *buf);
	void	(*dma_unmap)(struct vfio_device *vdev, u64 iova, u64 length);
	int	(*device_feature)(struct vfio_device *device, u32 flags,
				  void __user *arg, size_t argsz);
};

#if IS_ENABLED(CONFIG_IOMMUFD)
struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev);
int vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx);
int vfio_iommufd_physical_bind(struct vfio_device *vdev,
			       struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev);
int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev,
					    u32 pasid, u32 *pt_id);
void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev,
					     u32 pasid);
int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
			       struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev);
#else
static inline struct iommufd_ctx *
vfio_iommufd_device_ictx(struct vfio_device *vdev)
{
	return NULL;
}

static inline int
vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
{
	return VFIO_PCI_DEVID_NOT_OWNED;
}

#define vfio_iommufd_physical_bind                                      \
	((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx,   \
		  u32 *out_device_id)) NULL)
#define vfio_iommufd_physical_unbind \
	((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_physical_attach_ioas \
	((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
#define vfio_iommufd_physical_detach_ioas \
	((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_physical_pasid_attach_ioas \
	((int (*)(struct vfio_device *vdev, u32 pasid, u32 *pt_id)) NULL)
#define vfio_iommufd_physical_pasid_detach_ioas \
	((void (*)(struct vfio_device *vdev, u32 pasid)) NULL)
#define vfio_iommufd_emulated_bind                                      \
	((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx,   \
		  u32 *out_device_id)) NULL)
#define vfio_iommufd_emulated_unbind \
	((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_emulated_attach_ioas \
	((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
#define vfio_iommufd_emulated_detach_ioas \
	((void (*)(struct vfio_device *vdev)) NULL)
#endif

static inline bool vfio_device_cdev_opened(struct vfio_device *device)
{
	return device->cdev_opened;
}

/**
 * struct vfio_migration_ops - VFIO bus device driver migration callbacks
 *
 * @migration_set_state: Optional callback to change the migration state for
 *         devices that support migration. It's mandatory for
 *         VFIO_DEVICE_FEATURE_MIGRATION migration support.
 *         The returned FD is used for data transfer according to the FSM
 *         definition. The driver is responsible to ensure that FD reaches end
 *         of stream or error whenever the migration FSM leaves a data transfer
 *         state or before close_device() returns.
 * @migration_get_state: Optional callback to get the migration state for
 *         devices that support migration. It's mandatory for
 *         VFIO_DEVICE_FEATURE_MIGRATION migration support.
 * @migration_get_data_size: Optional callback to get the estimated data
 *          length that will be required to complete stop copy. It's mandatory for
 *          VFIO_DEVICE_FEATURE_MIGRATION migration support.
 */
struct vfio_migration_ops {
	struct file *(*migration_set_state)(
		struct vfio_device *device,
		enum vfio_device_mig_state new_state);
	int (*migration_get_state)(struct vfio_device *device,
				   enum vfio_device_mig_state *curr_state);
	int (*migration_get_data_size)(struct vfio_device *device,
				       unsigned long *stop_copy_length);
};

/**
 * struct vfio_log_ops - VFIO bus device driver logging callbacks
 *
 * @log_start: Optional callback to ask the device start DMA logging.
 * @log_stop: Optional callback to ask the device stop DMA logging.
 * @log_read_and_clear: Optional callback to ask the device read
 *         and clear the dirty DMAs in some given range.
 *
 * The vfio core implementation of the DEVICE_FEATURE_DMA_LOGGING_ set
 * of features does not track logging state relative to the device,
 * therefore the device implementation of vfio_log_ops must handle
 * arbitrary user requests. This includes rejecting subsequent calls
 * to log_start without an intervening log_stop, as well as graceful
 * handling of log_stop and log_read_and_clear from invalid states.
 */
struct vfio_log_ops {
	int (*log_start)(struct vfio_device *device,
		struct rb_root_cached *ranges, u32 nnodes, u64 *page_size);
	int (*log_stop)(struct vfio_device *device);
	int (*log_read_and_clear)(struct vfio_device *device,
		unsigned long iova, unsigned long length,
		struct iova_bitmap *dirty);
};

/**
 * vfio_check_feature - Validate user input for the VFIO_DEVICE_FEATURE ioctl
 * @flags: Arg from the device_feature op
 * @argsz: Arg from the device_feature op
 * @supported_ops: Combination of VFIO_DEVICE_FEATURE_GET and SET the driver
 *                 supports
 * @minsz: Minimum data size the driver accepts
 *
 * For use in a driver's device_feature op. Checks that the inputs to the
 * VFIO_DEVICE_FEATURE ioctl are correct for the driver's feature. Returns 1 if
 * the driver should execute the get or set, otherwise the relevant
 * value should be returned.
 */
static inline int vfio_check_feature(u32 flags, size_t argsz, u32 supported_ops,
				    size_t minsz)
{
	if ((flags & (VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_SET)) &
	    ~supported_ops)
		return -EINVAL;
	if (flags & VFIO_DEVICE_FEATURE_PROBE)
		return 0;
	/* Without PROBE one of GET or SET must be requested */
	if (!(flags & (VFIO_DEVICE_FEATURE_GET | VFIO_DEVICE_FEATURE_SET)))
		return -EINVAL;
	if (argsz < minsz)
		return -EINVAL;
	return 1;
}

struct vfio_device *_vfio_alloc_device(size_t size, struct device *dev,
				       const struct vfio_device_ops *ops);
#define vfio_alloc_device(dev_struct, member, dev, ops)				\
	container_of(_vfio_alloc_device(sizeof(struct dev_struct) +		\
					BUILD_BUG_ON_ZERO(offsetof(		\
						struct dev_struct, member)),	\
					dev, ops),				\
		     struct dev_struct, member)

static inline void vfio_put_device(struct vfio_device *device)
{
	put_device(&device->device);
}

int vfio_register_group_dev(struct vfio_device *device);
int vfio_register_emulated_iommu_dev(struct vfio_device *device);
void vfio_unregister_group_dev(struct vfio_device *device);

int vfio_assign_device_set(struct vfio_device *device, void *set_id);
unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set);
struct vfio_device *
vfio_find_device_in_devset(struct vfio_device_set *dev_set,
			   struct device *dev);

int vfio_mig_get_next_state(struct vfio_device *device,
			    enum vfio_device_mig_state cur_fsm,
			    enum vfio_device_mig_state new_fsm,
			    enum vfio_device_mig_state *next_fsm);

void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
			      u32 req_nodes);

/*
 * External user API
 */
struct iommu_group *vfio_file_iommu_group(struct file *file);

#if IS_ENABLED(CONFIG_VFIO_GROUP)
bool vfio_file_is_group(struct file *file);
bool vfio_file_has_dev(struct file *file, struct vfio_device *device);
#else
static inline bool vfio_file_is_group(struct file *file)
{
	return false;
}

static inline bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
{
	return false;
}
#endif
bool vfio_file_is_valid(struct file *file);
bool vfio_file_enforced_coherent(struct file *file);
void vfio_file_set_kvm(struct file *file, struct kvm *kvm);

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

int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova,
		   int npage, int prot, struct page **pages);
void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage);
int vfio_dma_rw(struct vfio_device *device, dma_addr_t iova,
		void *data, size_t len, bool write);

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

int vfio_info_add_capability(struct vfio_info_cap *caps,
			     struct vfio_info_cap_header *cap, size_t size);

int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
				       int num_irqs, int max_irq_type,
				       size_t *data_size);

/*
 * 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_entry_t		wait;
	poll_table		pt;
	struct work_struct	shutdown;
	struct work_struct	flush_inject;
	struct virqfd		**pvirqfd;
};

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

#endif /* VFIO_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0-only */
	2	/*
	3	* VFIO API definition
	4	*
	5	* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
	6	* Author: Alex Williamson <alex.williamson@redhat.com>
	7	*/
	8	#ifndef VFIO_H
	9	#define VFIO_H
	10
	11
	12	#include <linux/iommu.h>
	13	#include <linux/mm.h>
	14	#include <linux/workqueue.h>
	15	#include <linux/poll.h>
	16	#include <linux/cdev.h>
	17	#include <uapi/linux/vfio.h>
	18	#include <linux/iova_bitmap.h>
	19
	20	struct kvm;
	21	struct iommufd_ctx;
	22	struct iommufd_device;
	23	struct iommufd_access;
	24
	25	/*
	26	* VFIO devices can be placed in a set, this allows all devices to share this
	27	* structure and the VFIO core will provide a lock that is held around
	28	* open_device()/close_device() for all devices in the set.
	29	*/
	30	struct vfio_device_set {
	31	void *set_id;
	32	struct mutex lock;
	33	struct list_head device_list;
	34	unsigned int device_count;
	35	};
	36
	37	struct vfio_device {
	38	struct device *dev;
	39	const struct vfio_device_ops *ops;
	40	/*
	41	* mig_ops/log_ops is a static property of the vfio_device which must
	42	* be set prior to registering the vfio_device.
	43	*/
	44	const struct vfio_migration_ops *mig_ops;
	45	const struct vfio_log_ops *log_ops;
	46	#if IS_ENABLED(CONFIG_VFIO_GROUP)
	47	struct vfio_group *group;
	48	struct list_head group_next;
	49	struct list_head iommu_entry;
	50	#endif
	51	struct vfio_device_set *dev_set;
	52	struct list_head dev_set_list;
	53	unsigned int migration_flags;
	54	struct kvm *kvm;
	55
	56	/* Members below here are private, not for driver use */
	57	unsigned int index;
	58	struct device device; /* device.kref covers object life circle */
	59	#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
	60	struct cdev cdev;
	61	#endif
	62	refcount_t refcount; /* user count on registered device*/
	63	unsigned int open_count;
	64	struct completion comp;
	65	struct iommufd_access *iommufd_access;
	66	void (put_kvm)(struct kvm kvm);
	67	struct inode *inode;
	68	#if IS_ENABLED(CONFIG_IOMMUFD)
	69	struct iommufd_device *iommufd_device;
	70	struct ida pasids;
	71	u8 iommufd_attached:1;
	72	#endif
	73	u8 cdev_opened:1;
	74	#ifdef CONFIG_DEBUG_FS
	75	/*
	76	* debug_root is a static property of the vfio_device
	77	* which must be set prior to registering the vfio_device.
	78	*/
	79	struct dentry *debug_root;
	80	#endif
	81	};
	82
	83	/**
	84	* struct vfio_device_ops - VFIO bus driver device callbacks
	85	*
	86	* @name: Name of the device driver.
	87	* @init: initialize private fields in device structure
	88	* @release: Reclaim private fields in device structure
	89	* @bind_iommufd: Called when binding the device to an iommufd
	90	* @unbind_iommufd: Opposite of bind_iommufd
	91	* @attach_ioas: Called when attaching device to an IOAS/HWPT managed by the
	92	* bound iommufd. Undo in unbind_iommufd if @detach_ioas is not
	93	* called.
	94	* @detach_ioas: Opposite of attach_ioas
	95	* @pasid_attach_ioas: The pasid variation of attach_ioas
	96	* @pasid_detach_ioas: Opposite of pasid_attach_ioas
	97	* @open_device: Called when the first file descriptor is opened for this device
	98	* @close_device: Opposite of open_device
	99	* @read: Perform read(2) on device file descriptor
	100	* @write: Perform write(2) on device file descriptor
	101	* @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
	102	* operations documented below
	103	* @mmap: Perform mmap(2) on a region of the device file descriptor
	104	* @request: Request for the bus driver to release the device
	105	* @match: Optional device name match callback (return: 0 for no-match, >0 for
	106	* match, -errno for abort (ex. match with insufficient or incorrect
	107	* additional args)
	108	* @dma_unmap: Called when userspace unmaps IOVA from the container
	109	* this device is attached to.
	110	* @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl
	111	*/
	112	struct vfio_device_ops {
	113	char *name;
	114	int (init)(struct vfio_device vdev);
	115	void (release)(struct vfio_device vdev);
	116	int (bind_iommufd)(struct vfio_device vdev,
	117	struct iommufd_ctx ictx, u32 out_device_id);
	118	void (unbind_iommufd)(struct vfio_device vdev);
	119	int (attach_ioas)(struct vfio_device vdev, u32 *pt_id);
	120	void (detach_ioas)(struct vfio_device vdev);
	121	int (pasid_attach_ioas)(struct vfio_device vdev, u32 pasid,
	122	u32 *pt_id);
	123	void (pasid_detach_ioas)(struct vfio_device vdev, u32 pasid);
	124	int (open_device)(struct vfio_device vdev);
	125	void (close_device)(struct vfio_device vdev);
	126	ssize_t (read)(struct vfio_device vdev, char __user *buf,
	127	size_t count, loff_t *ppos);
	128	ssize_t (write)(struct vfio_device vdev, const char __user *buf,
	129	size_t count, loff_t *size);
	130	long (ioctl)(struct vfio_device vdev, unsigned int cmd,
	131	unsigned long arg);
	132	int (mmap)(struct vfio_device vdev, struct vm_area_struct *vma);
	133	void (request)(struct vfio_device vdev, unsigned int count);
	134	int (match)(struct vfio_device vdev, char *buf);
	135	void (dma_unmap)(struct vfio_device vdev, u64 iova, u64 length);
	136	int (device_feature)(struct vfio_device device, u32 flags,
	137	void __user *arg, size_t argsz);
	138	};
	139
	140	#if IS_ENABLED(CONFIG_IOMMUFD)
	141	struct iommufd_ctx vfio_iommufd_device_ictx(struct vfio_device vdev);
	142	int vfio_iommufd_get_dev_id(struct vfio_device vdev, struct iommufd_ctx ictx);
	143	int vfio_iommufd_physical_bind(struct vfio_device *vdev,
	144	struct iommufd_ctx ictx, u32 out_device_id);
	145	void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
	146	int vfio_iommufd_physical_attach_ioas(struct vfio_device vdev, u32 pt_id);
	147	void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev);
	148	int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev,
	149	u32 pasid, u32 *pt_id);
	150	void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev,
	151	u32 pasid);
	152	int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
	153	struct iommufd_ctx ictx, u32 out_device_id);
	154	void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
	155	int vfio_iommufd_emulated_attach_ioas(struct vfio_device vdev, u32 pt_id);
	156	void vfio_iommufd_emulated_detach_ioas(struct vfio_device *vdev);
	157	#else
	158	static inline struct iommufd_ctx *
	159	vfio_iommufd_device_ictx(struct vfio_device *vdev)
	160	{
	161	return NULL;
	162	}
	163
	164	static inline int
	165	vfio_iommufd_get_dev_id(struct vfio_device vdev, struct iommufd_ctx ictx)
	166	{
	167	return VFIO_PCI_DEVID_NOT_OWNED;
	168	}
	169
	170	#define vfio_iommufd_physical_bind \
	171	((int ()(struct vfio_device vdev, struct iommufd_ctx *ictx, \
	172	u32 *out_device_id)) NULL)
	173	#define vfio_iommufd_physical_unbind \
	174	((void ()(struct vfio_device vdev)) NULL)
	175	#define vfio_iommufd_physical_attach_ioas \
	176	((int ()(struct vfio_device vdev, u32 *pt_id)) NULL)
	177	#define vfio_iommufd_physical_detach_ioas \
	178	((void ()(struct vfio_device vdev)) NULL)
	179	#define vfio_iommufd_physical_pasid_attach_ioas \
	180	((int ()(struct vfio_device vdev, u32 pasid, u32 *pt_id)) NULL)
	181	#define vfio_iommufd_physical_pasid_detach_ioas \
	182	((void ()(struct vfio_device vdev, u32 pasid)) NULL)
	183	#define vfio_iommufd_emulated_bind \
	184	((int ()(struct vfio_device vdev, struct iommufd_ctx *ictx, \
	185	u32 *out_device_id)) NULL)
	186	#define vfio_iommufd_emulated_unbind \
	187	((void ()(struct vfio_device vdev)) NULL)
	188	#define vfio_iommufd_emulated_attach_ioas \
	189	((int ()(struct vfio_device vdev, u32 *pt_id)) NULL)
	190	#define vfio_iommufd_emulated_detach_ioas \
	191	((void ()(struct vfio_device vdev)) NULL)
	192	#endif
	193
	194	static inline bool vfio_device_cdev_opened(struct vfio_device *device)
	195	{
	196	return device->cdev_opened;
	197	}
	198
	199	/**
	200	* struct vfio_migration_ops - VFIO bus device driver migration callbacks
	201	*
	202	* @migration_set_state: Optional callback to change the migration state for
	203	* devices that support migration. It's mandatory for
	204	* VFIO_DEVICE_FEATURE_MIGRATION migration support.
	205	* The returned FD is used for data transfer according to the FSM
	206	* definition. The driver is responsible to ensure that FD reaches end
	207	* of stream or error whenever the migration FSM leaves a data transfer
	208	* state or before close_device() returns.
	209	* @migration_get_state: Optional callback to get the migration state for
	210	* devices that support migration. It's mandatory for
	211	* VFIO_DEVICE_FEATURE_MIGRATION migration support.
	212	* @migration_get_data_size: Optional callback to get the estimated data
	213	* length that will be required to complete stop copy. It's mandatory for
	214	* VFIO_DEVICE_FEATURE_MIGRATION migration support.
	215	*/
	216	struct vfio_migration_ops {
	217	struct file (migration_set_state)(
	218	struct vfio_device *device,
	219	enum vfio_device_mig_state new_state);
	220	int (migration_get_state)(struct vfio_device device,
	221	enum vfio_device_mig_state *curr_state);
	222	int (migration_get_data_size)(struct vfio_device device,
	223	unsigned long *stop_copy_length);
	224	};
	225
	226	/**
	227	* struct vfio_log_ops - VFIO bus device driver logging callbacks
	228	*
	229	* @log_start: Optional callback to ask the device start DMA logging.
	230	* @log_stop: Optional callback to ask the device stop DMA logging.
	231	* @log_read_and_clear: Optional callback to ask the device read
	232	* and clear the dirty DMAs in some given range.
	233	*
	234	* The vfio core implementation of the DEVICE_FEATURE_DMA_LOGGING_ set
	235	* of features does not track logging state relative to the device,
	236	* therefore the device implementation of vfio_log_ops must handle
	237	* arbitrary user requests. This includes rejecting subsequent calls
	238	* to log_start without an intervening log_stop, as well as graceful
	239	* handling of log_stop and log_read_and_clear from invalid states.
	240	*/
	241	struct vfio_log_ops {
	242	int (log_start)(struct vfio_device device,
	243	struct rb_root_cached ranges, u32 nnodes, u64 page_size);
	244	int (log_stop)(struct vfio_device device);
	245	int (log_read_and_clear)(struct vfio_device device,
	246	unsigned long iova, unsigned long length,
	247	struct iova_bitmap *dirty);
	248	};
	249
	250	/**
	251	* vfio_check_feature - Validate user input for the VFIO_DEVICE_FEATURE ioctl
	252	* @flags: Arg from the device_feature op
	253	* @argsz: Arg from the device_feature op
	254	* @supported_ops: Combination of VFIO_DEVICE_FEATURE_GET and SET the driver
	255	* supports
	256	* @minsz: Minimum data size the driver accepts
	257	*
	258	* For use in a driver's device_feature op. Checks that the inputs to the
	259	* VFIO_DEVICE_FEATURE ioctl are correct for the driver's feature. Returns 1 if
	260	* the driver should execute the get or set, otherwise the relevant
	261	* value should be returned.
	262	*/
	263	static inline int vfio_check_feature(u32 flags, size_t argsz, u32 supported_ops,
	264	size_t minsz)
	265	{
	266	if ((flags & (VFIO_DEVICE_FEATURE_GET \| VFIO_DEVICE_FEATURE_SET)) &
	267	~supported_ops)
	268	return -EINVAL;
	269	if (flags & VFIO_DEVICE_FEATURE_PROBE)
	270	return 0;
	271	/* Without PROBE one of GET or SET must be requested */
	272	if (!(flags & (VFIO_DEVICE_FEATURE_GET \| VFIO_DEVICE_FEATURE_SET)))
	273	return -EINVAL;
	274	if (argsz < minsz)
	275	return -EINVAL;
	276	return 1;
	277	}
	278
	279	struct vfio_device _vfio_alloc_device(size_t size, struct device dev,
	280	const struct vfio_device_ops *ops);
	281	#define vfio_alloc_device(dev_struct, member, dev, ops) \
	282	container_of(_vfio_alloc_device(sizeof(struct dev_struct) + \
	283	BUILD_BUG_ON_ZERO(offsetof( \
	284	struct dev_struct, member)), \
	285	dev, ops), \
	286	struct dev_struct, member)
	287
	288	static inline void vfio_put_device(struct vfio_device *device)
	289	{
	290	put_device(&device->device);
	291	}
	292
	293	int vfio_register_group_dev(struct vfio_device *device);
	294	int vfio_register_emulated_iommu_dev(struct vfio_device *device);
	295	void vfio_unregister_group_dev(struct vfio_device *device);
	296
	297	int vfio_assign_device_set(struct vfio_device device, void set_id);
	298	unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set);
	299	struct vfio_device *
	300	vfio_find_device_in_devset(struct vfio_device_set *dev_set,
	301	struct device *dev);
	302
	303	int vfio_mig_get_next_state(struct vfio_device *device,
	304	enum vfio_device_mig_state cur_fsm,
	305	enum vfio_device_mig_state new_fsm,
	306	enum vfio_device_mig_state *next_fsm);
	307
	308	void vfio_combine_iova_ranges(struct rb_root_cached *root, u32 cur_nodes,
	309	u32 req_nodes);
	310
	311	/*
	312	* External user API
	313	*/
	314	struct iommu_group vfio_file_iommu_group(struct file file);
	315
	316	#if IS_ENABLED(CONFIG_VFIO_GROUP)
	317	bool vfio_file_is_group(struct file *file);
	318	bool vfio_file_has_dev(struct file file, struct vfio_device device);
	319	#else
	320	static inline bool vfio_file_is_group(struct file *file)
	321	{
	322	return false;
	323	}
	324
	325	static inline bool vfio_file_has_dev(struct file file, struct vfio_device device)
	326	{
	327	return false;
	328	}
	329	#endif
	330	bool vfio_file_is_valid(struct file *file);
	331	bool vfio_file_enforced_coherent(struct file *file);
	332	void vfio_file_set_kvm(struct file file, struct kvm kvm);
	333
	334	#define VFIO_PIN_PAGES_MAX_ENTRIES (PAGE_SIZE/sizeof(unsigned long))
	335
	336	int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova,
	337	int npage, int prot, struct page **pages);
	338	void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage);
	339	int vfio_dma_rw(struct vfio_device *device, dma_addr_t iova,
	340	void *data, size_t len, bool write);
	341
	342	/*
	343	* Sub-module helpers
	344	*/
	345	struct vfio_info_cap {
	346	struct vfio_info_cap_header *buf;
	347	size_t size;
	348	};
	349	struct vfio_info_cap_header vfio_info_cap_add(struct vfio_info_cap caps,
	350	size_t size, u16 id,
	351	u16 version);
	352	void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
	353
	354	int vfio_info_add_capability(struct vfio_info_cap *caps,
	355	struct vfio_info_cap_header *cap, size_t size);
	356
	357	int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
	358	int num_irqs, int max_irq_type,
	359	size_t *data_size);
	360
	361	/*
	362	* IRQfd - generic
	363	*/
	364	struct virqfd {
	365	void *opaque;
	366	struct eventfd_ctx *eventfd;
	367	int (handler)(void , void *);
	368	void (thread)(void , void *);
	369	void *data;
	370	struct work_struct inject;
	371	wait_queue_entry_t wait;
	372	poll_table pt;
	373	struct work_struct shutdown;
	374	struct work_struct flush_inject;
	375	struct virqfd **pvirqfd;
	376	};
	377
	378	int vfio_virqfd_enable(void opaque, int (handler)(void , void ),
	379	void (thread)(void , void ), void data,
	380	struct virqfd **pvirqfd, int fd);
	381	void vfio_virqfd_disable(struct virqfd **pvirqfd);
	382	void vfio_virqfd_flush_thread(struct virqfd **pvirqfd);
	383
	384	#endif /* VFIO_H */