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Diffstat (limited to 'include/linux/vfio.h')
| -rw-r--r-- | include/linux/vfio.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/include/linux/vfio.h b/include/linux/vfio.h new file mode 100644 index 000000000..fdd393f70 --- /dev/null +++ b/include/linux/vfio.h @@ -0,0 +1,279 @@ +/* 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; + +/* + * 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; +}; + +/** + * 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 (*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); +}; + +/** + * @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); +unsigned int vfio_device_set_open_count(struct vfio_device_set *dev_set); + +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 */ |