[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 <uapi/linux/vfio.h>
#include <linux/iova_bitmap.h>

struct kvm;
struct iommufd_ctx;
struct iommufd_device;

/*
 * 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;
	struct vfio_group *group;
	struct vfio_device_set *dev_set;
	struct list_head dev_set_list;
	unsigned int migration_flags;
	/* Driver must reference the kvm during open_device or never touch it */
	struct kvm *kvm;

	/* Members below here are private, not for driver use */
	unsigned int index;
	struct device device;	/* device.kref covers object life circle */
	refcount_t refcount;	/* user count on registered device*/
	unsigned int open_count;
	struct completion comp;
	struct list_head group_next;
	struct list_head iommu_entry;
#if IS_ENABLED(CONFIG_IOMMUFD)
	struct iommufd_device *iommufd_device;
	bool iommufd_attached;
#endif
};

/**
 * struct vfio_device_ops - VFIO bus driver device callbacks
 *
 * @init: initialize private fields in device structure
 * @release: Reclaim private fields in device structure
 * @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);
	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)
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);
#else
#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)
#endif

/**
 * @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.
 */
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);
};

/**
 * @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)

int vfio_init_device(struct vfio_device *device, struct device *dev,
		     const struct vfio_device_ops *ops);
void vfio_free_device(struct vfio_device *device);
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);

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);

/*
 * External user API
 */
struct iommu_group *vfio_file_iommu_group(struct file *file);
bool vfio_file_is_group(struct file *file);
bool vfio_file_enforced_coherent(struct file *file);
void vfio_file_set_kvm(struct file *file, struct kvm *kvm);
bool vfio_file_has_dev(struct file *file, struct vfio_device *device);

#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);

struct pci_dev;
#if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH)
void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
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_VFIO_SPAPR_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_entry_t		wait;
	poll_table		pt;
	struct work_struct	shutdown;
	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);

#endif /* VFIO_H */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
cba3345c AW	2	/*
	3	* VFIO API definition
	4	*
	5	* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
	6	* Author: Alex Williamson <alex.williamson@redhat.com>
cba3345c AW	7	*/
	8	#ifndef VFIO_H
	9	#define VFIO_H
	10
cba3345c AW	11
	12	#include <linux/iommu.h>
	13	#include <linux/mm.h>
7e992d69 AM	14	#include <linux/workqueue.h>
7e992d69 AM	15	#include <linux/poll.h>
607ca46e	16	#include <uapi/linux/vfio.h>
80c4b92a	17	#include <linux/iova_bitmap.h>
cba3345c	18
ba70a89f	19	struct kvm;
a4d1f91d JG	20	struct iommufd_ctx;
a4d1f91d JG	21	struct iommufd_device;
ba70a89f	22
2fd585f4 JG	23	/*
	24	* VFIO devices can be placed in a set, this allows all devices to share this
	25	* structure and the VFIO core will provide a lock that is held around
	26	* open_device()/close_device() for all devices in the set.
	27	*/
	28	struct vfio_device_set {
	29	void *set_id;
	30	struct mutex lock;
	31	struct list_head device_list;
	32	unsigned int device_count;
	33	};
	34
0bfc6a4e JG	35	struct vfio_device {
	36	struct device *dev;
	37	const struct vfio_device_ops *ops;
6e97eba8	38	/*
80c4b92a YH	39	* mig_ops/log_ops is a static property of the vfio_device which must
80c4b92a YH	40	* be set prior to registering the vfio_device.
6e97eba8 YH	41	*/
6e97eba8 YH	42	const struct vfio_migration_ops *mig_ops;
80c4b92a	43	const struct vfio_log_ops *log_ops;
0bfc6a4e	44	struct vfio_group *group;
2fd585f4 JG	45	struct vfio_device_set *dev_set;
2fd585f4 JG	46	struct list_head dev_set_list;
8cb3d83b	47	unsigned int migration_flags;
421cfe65 MR	48	/* Driver must reference the kvm during open_device or never touch it */
421cfe65 MR	49	struct kvm *kvm;
0bfc6a4e JG	50
0bfc6a4e JG	51	/* Members below here are private, not for driver use */
3c28a761 YL	52	unsigned int index;
3c28a761 YL	53	struct device device; /* device.kref covers object life circle */
cb9ff3f3	54	refcount_t refcount; /* user count on registered device*/
2fd585f4	55	unsigned int open_count;
0bfc6a4e JG	56	struct completion comp;
0bfc6a4e JG	57	struct list_head group_next;
8cfc5b60	58	struct list_head iommu_entry;
a4d1f91d JG	59	#if IS_ENABLED(CONFIG_IOMMUFD)
	60	struct iommufd_device *iommufd_device;
	61	bool iommufd_attached;
	62	#endif
0bfc6a4e JG	63	};
0bfc6a4e JG	64
cba3345c AW	65	/**
	66	* struct vfio_device_ops - VFIO bus driver device callbacks
	67	*
cb9ff3f3 KT	68	* @init: initialize private fields in device structure
cb9ff3f3 KT	69	* @release: Reclaim private fields in device structure
2fd585f4 JG	70	* @open_device: Called when the first file descriptor is opened for this device
2fd585f4 JG	71	* @close_device: Opposite of open_device
cba3345c AW	72	* @read: Perform read(2) on device file descriptor
	73	* @write: Perform write(2) on device file descriptor
	74	* @ioctl: Perform ioctl(2) on device file descriptor, supporting VFIO_DEVICE_*
	75	* operations documented below
	76	* @mmap: Perform mmap(2) on a region of the device file descriptor
13060b64	77	* @request: Request for the bus driver to release the device
5f3874c2 AW	78	* @match: Optional device name match callback (return: 0 for no-match, >0 for
	79	* match, -errno for abort (ex. match with insufficient or incorrect
	80	* additional args)
ce4b4657 JG	81	* @dma_unmap: Called when userspace unmaps IOVA from the container
ce4b4657 JG	82	* this device is attached to.
445ad495	83	* @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl
cba3345c AW	84	*/
	85	struct vfio_device_ops {
	86	char *name;
cb9ff3f3 KT	87	int (init)(struct vfio_device vdev);
cb9ff3f3 KT	88	void (release)(struct vfio_device vdev);
a4d1f91d JG	89	int (bind_iommufd)(struct vfio_device vdev,
	90	struct iommufd_ctx ictx, u32 out_device_id);
	91	void (unbind_iommufd)(struct vfio_device vdev);
	92	int (attach_ioas)(struct vfio_device vdev, u32 *pt_id);
2fd585f4 JG	93	int (open_device)(struct vfio_device vdev);
2fd585f4 JG	94	void (close_device)(struct vfio_device vdev);
6df62c5b	95	ssize_t (read)(struct vfio_device vdev, char __user *buf,
cba3345c	96	size_t count, loff_t *ppos);
6df62c5b	97	ssize_t (write)(struct vfio_device vdev, const char __user *buf,
cba3345c	98	size_t count, loff_t *size);
6df62c5b	99	long (ioctl)(struct vfio_device vdev, unsigned int cmd,
cba3345c	100	unsigned long arg);
6df62c5b JG	101	int (mmap)(struct vfio_device vdev, struct vm_area_struct *vma);
	102	void (request)(struct vfio_device vdev, unsigned int count);
	103	int (match)(struct vfio_device vdev, char *buf);
ce4b4657	104	void (dma_unmap)(struct vfio_device vdev, u64 iova, u64 length);
445ad495 JG	105	int (device_feature)(struct vfio_device device, u32 flags,
445ad495 JG	106	void __user *arg, size_t argsz);
6e97eba8 YH	107	};
6e97eba8 YH	108
a4d1f91d JG	109	#if IS_ENABLED(CONFIG_IOMMUFD)
	110	int vfio_iommufd_physical_bind(struct vfio_device *vdev,
	111	struct iommufd_ctx ictx, u32 out_device_id);
	112	void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
	113	int vfio_iommufd_physical_attach_ioas(struct vfio_device vdev, u32 pt_id);
	114	#else
	115	#define vfio_iommufd_physical_bind \
	116	((int ()(struct vfio_device vdev, struct iommufd_ctx *ictx, \
	117	u32 *out_device_id)) NULL)
	118	#define vfio_iommufd_physical_unbind \
	119	((void ()(struct vfio_device vdev)) NULL)
	120	#define vfio_iommufd_physical_attach_ioas \
	121	((int ()(struct vfio_device vdev, u32 *pt_id)) NULL)
	122	#endif
	123
6e97eba8 YH	124	/**
	125	* @migration_set_state: Optional callback to change the migration state for
	126	* devices that support migration. It's mandatory for
	127	* VFIO_DEVICE_FEATURE_MIGRATION migration support.
	128	* The returned FD is used for data transfer according to the FSM
	129	* definition. The driver is responsible to ensure that FD reaches end
	130	* of stream or error whenever the migration FSM leaves a data transfer
	131	* state or before close_device() returns.
	132	* @migration_get_state: Optional callback to get the migration state for
	133	* devices that support migration. It's mandatory for
	134	* VFIO_DEVICE_FEATURE_MIGRATION migration support.
	135	*/
	136	struct vfio_migration_ops {
115dcec6 JG	137	struct file (migration_set_state)(
	138	struct vfio_device *device,
	139	enum vfio_device_mig_state new_state);
	140	int (migration_get_state)(struct vfio_device device,
	141	enum vfio_device_mig_state *curr_state);
cba3345c AW	142	};
cba3345c AW	143
80c4b92a YH	144	/**
	145	* @log_start: Optional callback to ask the device start DMA logging.
	146	* @log_stop: Optional callback to ask the device stop DMA logging.
	147	* @log_read_and_clear: Optional callback to ask the device read
	148	* and clear the dirty DMAs in some given range.
	149	*
	150	* The vfio core implementation of the DEVICE_FEATURE_DMA_LOGGING_ set
	151	* of features does not track logging state relative to the device,
	152	* therefore the device implementation of vfio_log_ops must handle
	153	* arbitrary user requests. This includes rejecting subsequent calls
	154	* to log_start without an intervening log_stop, as well as graceful
	155	* handling of log_stop and log_read_and_clear from invalid states.
	156	*/
	157	struct vfio_log_ops {
	158	int (log_start)(struct vfio_device device,
	159	struct rb_root_cached ranges, u32 nnodes, u64 page_size);
	160	int (log_stop)(struct vfio_device device);
	161	int (log_read_and_clear)(struct vfio_device device,
	162	unsigned long iova, unsigned long length,
	163	struct iova_bitmap *dirty);
	164	};
	165
445ad495 JG	166	/**
	167	* vfio_check_feature - Validate user input for the VFIO_DEVICE_FEATURE ioctl
	168	* @flags: Arg from the device_feature op
	169	* @argsz: Arg from the device_feature op
	170	* @supported_ops: Combination of VFIO_DEVICE_FEATURE_GET and SET the driver
	171	* supports
	172	* @minsz: Minimum data size the driver accepts
	173	*
	174	* For use in a driver's device_feature op. Checks that the inputs to the
	175	* VFIO_DEVICE_FEATURE ioctl are correct for the driver's feature. Returns 1 if
	176	* the driver should execute the get or set, otherwise the relevant
	177	* value should be returned.
	178	*/
	179	static inline int vfio_check_feature(u32 flags, size_t argsz, u32 supported_ops,
	180	size_t minsz)
	181	{
	182	if ((flags & (VFIO_DEVICE_FEATURE_GET \| VFIO_DEVICE_FEATURE_SET)) &
	183	~supported_ops)
	184	return -EINVAL;
	185	if (flags & VFIO_DEVICE_FEATURE_PROBE)
	186	return 0;
	187	/* Without PROBE one of GET or SET must be requested */
	188	if (!(flags & (VFIO_DEVICE_FEATURE_GET \| VFIO_DEVICE_FEATURE_SET)))
	189	return -EINVAL;
	190	if (argsz < minsz)
	191	return -EINVAL;
	192	return 1;
	193	}
	194
cb9ff3f3 KT	195	struct vfio_device _vfio_alloc_device(size_t size, struct device dev,
	196	const struct vfio_device_ops *ops);
	197	#define vfio_alloc_device(dev_struct, member, dev, ops) \
	198	container_of(_vfio_alloc_device(sizeof(struct dev_struct) + \
	199	BUILD_BUG_ON_ZERO(offsetof( \
	200	struct dev_struct, member)), \
	201	dev, ops), \
	202	struct dev_struct, member)
	203
	204	int vfio_init_device(struct vfio_device device, struct device dev,
	205	const struct vfio_device_ops *ops);
	206	void vfio_free_device(struct vfio_device *device);
cb9ff3f3 KT	207	static inline void vfio_put_device(struct vfio_device *device)
cb9ff3f3 KT	208	{
3c28a761	209	put_device(&device->device);
cb9ff3f3 KT	210	}
cb9ff3f3 KT	211
0bfc6a4e	212	int vfio_register_group_dev(struct vfio_device *device);
c68ea0d0	213	int vfio_register_emulated_iommu_dev(struct vfio_device *device);
0bfc6a4e	214	void vfio_unregister_group_dev(struct vfio_device *device);
cba3345c	215
2fd585f4 JG	216	int vfio_assign_device_set(struct vfio_device device, void set_id);
2fd585f4 JG	217
115dcec6 JG	218	int vfio_mig_get_next_state(struct vfio_device *device,
	219	enum vfio_device_mig_state cur_fsm,
	220	enum vfio_device_mig_state new_fsm,
	221	enum vfio_device_mig_state *next_fsm);
	222
6cdd9782 AK	223	/*
	224	* External user API
	225	*/
d1877e63	226	struct iommu_group vfio_file_iommu_group(struct file file);
4b22ef04	227	bool vfio_file_is_group(struct file *file);
d1877e63 AW	228	bool vfio_file_enforced_coherent(struct file *file);
	229	void vfio_file_set_kvm(struct file file, struct kvm kvm);
	230	bool vfio_file_has_dev(struct file file, struct vfio_device device);
6cdd9782	231
2169037d KW	232	#define VFIO_PIN_PAGES_MAX_ENTRIES (PAGE_SIZE/sizeof(unsigned long))
2169037d KW	233
44abdd16	234	int vfio_pin_pages(struct vfio_device *device, dma_addr_t iova,
34a255e6	235	int npage, int prot, struct page **pages);
44abdd16	236	void vfio_unpin_pages(struct vfio_device *device, dma_addr_t iova, int npage);
8561aa4f	237	int vfio_dma_rw(struct vfio_device *device, dma_addr_t iova,
d1877e63	238	void *data, size_t len, bool write);
8d46c0cc	239
d7a8d5ed AW	240	/*
	241	* Sub-module helpers
	242	*/
	243	struct vfio_info_cap {
	244	struct vfio_info_cap_header *buf;
	245	size_t size;
	246	};
d1877e63 AW	247	struct vfio_info_cap_header vfio_info_cap_add(struct vfio_info_cap caps,
	248	size_t size, u16 id,
	249	u16 version);
	250	void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset);
d7a8d5ed	251
d1877e63 AW	252	int vfio_info_add_capability(struct vfio_info_cap *caps,
d1877e63 AW	253	struct vfio_info_cap_header *cap, size_t size);
b3c0a866	254
d1877e63 AW	255	int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr,
	256	int num_irqs, int max_irq_type,
	257	size_t *data_size);
c747f08a	258
92d18a68	259	struct pci_dev;
bb67b496	260	#if IS_ENABLED(CONFIG_VFIO_SPAPR_EEH)
d1877e63 AW	261	void vfio_spapr_pci_eeh_open(struct pci_dev *pdev);
	262	void vfio_spapr_pci_eeh_release(struct pci_dev *pdev);
	263	long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group, unsigned int cmd,
	264	unsigned long arg);
1b69be5e	265	#else
9b936c96	266	static inline void vfio_spapr_pci_eeh_open(struct pci_dev *pdev)
1b69be5e	267	{
1b69be5e GS	268	}
	269
	270	static inline void vfio_spapr_pci_eeh_release(struct pci_dev *pdev)
	271	{
	272	}
	273
	274	static inline long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
	275	unsigned int cmd,
	276	unsigned long arg)
	277	{
	278	return -ENOTTY;
	279	}
bb67b496	280	#endif /* CONFIG_VFIO_SPAPR_EEH */
7e992d69 AM	281
	282	/*
	283	* IRQfd - generic
	284	*/
	285	struct virqfd {
	286	void *opaque;
	287	struct eventfd_ctx *eventfd;
	288	int (handler)(void , void *);
	289	void (thread)(void , void *);
	290	void *data;
	291	struct work_struct inject;
ac6424b9	292	wait_queue_entry_t wait;
7e992d69 AM	293	poll_table pt;
	294	struct work_struct shutdown;
	295	struct virqfd **pvirqfd;
	296	};
	297
d1877e63 AW	298	int vfio_virqfd_enable(void opaque, int (handler)(void , void ),
	299	void (thread)(void , void ), void data,
	300	struct virqfd **pvirqfd, int fd);
	301	void vfio_virqfd_disable(struct virqfd **pvirqfd);
7e992d69	302
cba3345c	303	#endif /* VFIO_H */