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/* 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> /* * 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, unsigned long events, 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 bool vfio_external_group_match_file(struct vfio_group group, struct file filep); 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); / each type has independent events / enum vfio_notify_type { VFIO_IOMMU_NOTIFY = 0, VFIO_GROUP_NOTIFY = 1, }; / events for VFIO_IOMMU_NOTIFY / #define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0) / events for VFIO_GROUP_NOTIFY / #define VFIO_GROUP_NOTIFY_SET_KVM BIT(0) extern int vfio_register_notifier(struct device dev, enum vfio_notify_type type, unsigned long required_events, struct notifier_block nb); extern int vfio_unregister_notifier(struct device dev, enum vfio_notify_type type, struct notifier_block nb); struct kvm; extern void vfio_group_set_kvm(struct vfio_group group, struct kvm kvm); /* * 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); extern int vfio_info_add_capability(struct vfio_info_cap caps, struct vfio_info_cap_header cap, size_t size); extern 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) 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_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 work_struct flush_inject; 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); void vfio_virqfd_flush_thread(struct virqfd pvirqfd); #endif / VFIO_H */

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