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#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>#include <linux/uaccess.h>
struct kvm;struct iommufd_ctx;struct iommufd_device;struct iommufd_access;struct vfio_info_cap;
/* * 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; u8 precopy_info_v2; 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; u8 noiommu:1; /* * debug_root is a static property of the vfio_device * which must be set prior to registering the vfio_device. */ struct dentry *debug_root;};
/** * 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) * @match_token_uuid: Optional device token match/validation. Return 0 * if the uuid is valid for the device, -errno otherwise. uuid is NULL * if none was provided. * @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 (*get_region_info_caps)(struct vfio_device *vdev, struct vfio_region_info *info, struct vfio_info_cap *caps); 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); int (*match_token_uuid)(struct vfio_device *vdev, const uuid_t *uuid); 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);#elsestatic inline struct iommufd_ctx *vfio_iommufd_device_ictx(struct vfio_device *vdev){ return NULL;}
static inline intvfio_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;}
/** * vfio_check_precopy_ioctl - Validate user input for the VFIO_MIG_GET_PRECOPY_INFO ioctl * @vdev: The vfio device * @cmd: Cmd from the ioctl * @arg: Arg from the ioctl * @info: Driver pointer to hold the userspace input to the ioctl * * For use in a driver's get_precopy_info. Checks that the inputs to the * VFIO_MIG_GET_PRECOPY_INFO ioctl are correct.
* Returns 0 on success, otherwise errno. */
static inline intvfio_check_precopy_ioctl(struct vfio_device *vdev, unsigned int cmd, unsigned long arg, struct vfio_precopy_info *info){ unsigned long minsz;
if (cmd != VFIO_MIG_GET_PRECOPY_INFO) return -ENOTTY;
minsz = offsetofend(struct vfio_precopy_info, dirty_bytes);
if (copy_from_user(info, (void __user *)arg, minsz)) return -EFAULT;
if (info->argsz < minsz) return -EINVAL;
/* keep v1 behaviour as is for compatibility reasons */ if (vdev->precopy_info_v2) /* flags are output, set its initial value to 0 */ info->flags = 0;
return 0;}
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);bool vfio_device_try_get_registration(struct vfio_device *device);void vfio_device_put_registration(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);#elsestatic 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;}#endifbool 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 */