/* * VFIO API definition * * Copyright (C) 2012 Red Hat, Inc. All rights reserved. * Author: Alex Williamson * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #ifndef VFIO_H #define VFIO_H #include #include #define VFIO_API_VERSION 0 #ifdef __KERNEL__ /* Internal VFIO-core/bus driver API */ #include #include /** * 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 */ 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); }; 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); /** * 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); }; 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); /** * offsetofend(TYPE, MEMBER) * * @TYPE: The type of the structure * @MEMBER: The member within the structure to get the end offset of * * Simple helper macro for dealing with variable sized structures passed * from user space. This allows us to easily determine if the provided * structure is sized to include various fields. */ #define offsetofend(TYPE, MEMBER) ({ \ TYPE tmp; \ offsetof(TYPE, MEMBER) + sizeof(tmp.MEMBER); }) \ #endif /* __KERNEL__ */ /* Kernel & User level defines for VFIO IOCTLs. */ /* Extensions */ #define VFIO_TYPE1_IOMMU 1 /* * The IOCTL interface is designed for extensibility by embedding the * structure length (argsz) and flags into structures passed between * kernel and userspace. We therefore use the _IO() macro for these * defines to avoid implicitly embedding a size into the ioctl request. * As structure fields are added, argsz will increase to match and flag * bits will be defined to indicate additional fields with valid data. * It's *always* the caller's responsibility to indicate the size of * the structure passed by setting argsz appropriately. */ #define VFIO_TYPE (';') #define VFIO_BASE 100 /* -------- IOCTLs for VFIO file descriptor (/dev/vfio/vfio) -------- */ /** * VFIO_GET_API_VERSION - _IO(VFIO_TYPE, VFIO_BASE + 0) * * Report the version of the VFIO API. This allows us to bump the entire * API version should we later need to add or change features in incompatible * ways. * Return: VFIO_API_VERSION * Availability: Always */ #define VFIO_GET_API_VERSION _IO(VFIO_TYPE, VFIO_BASE + 0) /** * VFIO_CHECK_EXTENSION - _IOW(VFIO_TYPE, VFIO_BASE + 1, __u32) * * Check whether an extension is supported. * Return: 0 if not supported, 1 (or some other positive integer) if supported. * Availability: Always */ #define VFIO_CHECK_EXTENSION _IO(VFIO_TYPE, VFIO_BASE + 1) /** * VFIO_SET_IOMMU - _IOW(VFIO_TYPE, VFIO_BASE + 2, __s32) * * Set the iommu to the given type. The type must be supported by an * iommu driver as verified by calling CHECK_EXTENSION using the same * type. A group must be set to this file descriptor before this * ioctl is available. The IOMMU interfaces enabled by this call are * specific to the value set. * Return: 0 on success, -errno on failure * Availability: When VFIO group attached */ #define VFIO_SET_IOMMU _IO(VFIO_TYPE, VFIO_BASE + 2) /* -------- IOCTLs for GROUP file descriptors (/dev/vfio/$GROUP) -------- */ /** * VFIO_GROUP_GET_STATUS - _IOR(VFIO_TYPE, VFIO_BASE + 3, * struct vfio_group_status) * * Retrieve information about the group. Fills in provided * struct vfio_group_info. Caller sets argsz. * Return: 0 on succes, -errno on failure. * Availability: Always */ struct vfio_group_status { __u32 argsz; __u32 flags; #define VFIO_GROUP_FLAGS_VIABLE (1 << 0) #define VFIO_GROUP_FLAGS_CONTAINER_SET (1 << 1) }; #define VFIO_GROUP_GET_STATUS _IO(VFIO_TYPE, VFIO_BASE + 3) /** * VFIO_GROUP_SET_CONTAINER - _IOW(VFIO_TYPE, VFIO_BASE + 4, __s32) * * Set the container for the VFIO group to the open VFIO file * descriptor provided. Groups may only belong to a single * container. Containers may, at their discretion, support multiple * groups. Only when a container is set are all of the interfaces * of the VFIO file descriptor and the VFIO group file descriptor * available to the user. * Return: 0 on success, -errno on failure. * Availability: Always */ #define VFIO_GROUP_SET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 4) /** * VFIO_GROUP_UNSET_CONTAINER - _IO(VFIO_TYPE, VFIO_BASE + 5) * * Remove the group from the attached container. This is the * opposite of the SET_CONTAINER call and returns the group to * an initial state. All device file descriptors must be released * prior to calling this interface. When removing the last group * from a container, the IOMMU will be disabled and all state lost, * effectively also returning the VFIO file descriptor to an initial * state. * Return: 0 on success, -errno on failure. * Availability: When attached to container */ #define VFIO_GROUP_UNSET_CONTAINER _IO(VFIO_TYPE, VFIO_BASE + 5) /** * VFIO_GROUP_GET_DEVICE_FD - _IOW(VFIO_TYPE, VFIO_BASE + 6, char) * * Return a new file descriptor for the device object described by * the provided string. The string should match a device listed in * the devices subdirectory of the IOMMU group sysfs entry. The * group containing the device must already be added to this context. * Return: new file descriptor on success, -errno on failure. * Availability: When attached to container */ #define VFIO_GROUP_GET_DEVICE_FD _IO(VFIO_TYPE, VFIO_BASE + 6) /* --------------- IOCTLs for DEVICE file descriptors --------------- */ /** * VFIO_DEVICE_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 7, * struct vfio_device_info) * * Retrieve information about the device. Fills in provided * struct vfio_device_info. Caller sets argsz. * Return: 0 on success, -errno on failure. */ struct vfio_device_info { __u32 argsz; __u32 flags; #define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */ #define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */ __u32 num_regions; /* Max region index + 1 */ __u32 num_irqs; /* Max IRQ index + 1 */ }; #define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7) /** * VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8, * struct vfio_region_info) * * Retrieve information about a device region. Caller provides * struct vfio_region_info with index value set. Caller sets argsz. * Implementation of region mapping is bus driver specific. This is * intended to describe MMIO, I/O port, as well as bus specific * regions (ex. PCI config space). Zero sized regions may be used * to describe unimplemented regions (ex. unimplemented PCI BARs). * Return: 0 on success, -errno on failure. */ struct vfio_region_info { __u32 argsz; __u32 flags; #define VFIO_REGION_INFO_FLAG_READ (1 << 0) /* Region supports read */ #define VFIO_REGION_INFO_FLAG_WRITE (1 << 1) /* Region supports write */ #define VFIO_REGION_INFO_FLAG_MMAP (1 << 2) /* Region supports mmap */ __u32 index; /* Region index */ __u32 resv; /* Reserved for alignment */ __u64 size; /* Region size (bytes) */ __u64 offset; /* Region offset from start of device fd */ }; #define VFIO_DEVICE_GET_REGION_INFO _IO(VFIO_TYPE, VFIO_BASE + 8) /** * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9, * struct vfio_irq_info) * * Retrieve information about a device IRQ. Caller provides * struct vfio_irq_info with index value set. Caller sets argsz. * Implementation of IRQ mapping is bus driver specific. Indexes * using multiple IRQs are primarily intended to support MSI-like * interrupt blocks. Zero count irq blocks may be used to describe * unimplemented interrupt types. * * The EVENTFD flag indicates the interrupt index supports eventfd based * signaling. * * The MASKABLE flags indicates the index supports MASK and UNMASK * actions described below. * * AUTOMASKED indicates that after signaling, the interrupt line is * automatically masked by VFIO and the user needs to unmask the line * to receive new interrupts. This is primarily intended to distinguish * level triggered interrupts. * * The NORESIZE flag indicates that the interrupt lines within the index * are setup as a set and new subindexes cannot be enabled without first * disabling the entire index. This is used for interrupts like PCI MSI * and MSI-X where the driver may only use a subset of the available * indexes, but VFIO needs to enable a specific number of vectors * upfront. In the case of MSI-X, where the user can enable MSI-X and * then add and unmask vectors, it's up to userspace to make the decision * whether to allocate the maximum supported number of vectors or tear * down setup and incrementally increase the vectors as each is enabled. */ struct vfio_irq_info { __u32 argsz; __u32 flags; #define VFIO_IRQ_INFO_EVENTFD (1 << 0) #define VFIO_IRQ_INFO_MASKABLE (1 << 1) #define VFIO_IRQ_INFO_AUTOMASKED (1 << 2) #define VFIO_IRQ_INFO_NORESIZE (1 << 3) __u32 index; /* IRQ index */ __u32 count; /* Number of IRQs within this index */ }; #define VFIO_DEVICE_GET_IRQ_INFO _IO(VFIO_TYPE, VFIO_BASE + 9) /** * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set) * * Set signaling, masking, and unmasking of interrupts. Caller provides * struct vfio_irq_set with all fields set. 'start' and 'count' indicate * the range of subindexes being specified. * * The DATA flags specify the type of data provided. If DATA_NONE, the * operation performs the specified action immediately on the specified * interrupt(s). For example, to unmask AUTOMASKED interrupt [0,0]: * flags = (DATA_NONE|ACTION_UNMASK), index = 0, start = 0, count = 1. * * DATA_BOOL allows sparse support for the same on arrays of interrupts. * For example, to mask interrupts [0,1] and [0,3] (but not [0,2]): * flags = (DATA_BOOL|ACTION_MASK), index = 0, start = 1, count = 3, * data = {1,0,1} * * DATA_EVENTFD binds the specified ACTION to the provided __s32 eventfd. * A value of -1 can be used to either de-assign interrupts if already * assigned or skip un-assigned interrupts. For example, to set an eventfd * to be trigger for interrupts [0,0] and [0,2]: * flags = (DATA_EVENTFD|ACTION_TRIGGER), index = 0, start = 0, count = 3, * data = {fd1, -1, fd2} * If index [0,1] is previously set, two count = 1 ioctls calls would be * required to set [0,0] and [0,2] without changing [0,1]. * * Once a signaling mechanism is set, DATA_BOOL or DATA_NONE can be used * with ACTION_TRIGGER to perform kernel level interrupt loopback testing * from userspace (ie. simulate hardware triggering). * * Setting of an event triggering mechanism to userspace for ACTION_TRIGGER * enables the interrupt index for the device. Individual subindex interrupts * can be disabled using the -1 value for DATA_EVENTFD or the index can be * disabled as a whole with: flags = (DATA_NONE|ACTION_TRIGGER), count = 0. * * Note that ACTION_[UN]MASK specify user->kernel signaling (irqfds) while * ACTION_TRIGGER specifies kernel->user signaling. */ struct vfio_irq_set { __u32 argsz; __u32 flags; #define VFIO_IRQ_SET_DATA_NONE (1 << 0) /* Data not present */ #define VFIO_IRQ_SET_DATA_BOOL (1 << 1) /* Data is bool (u8) */ #define VFIO_IRQ_SET_DATA_EVENTFD (1 << 2) /* Data is eventfd (s32) */ #define VFIO_IRQ_SET_ACTION_MASK (1 << 3) /* Mask interrupt */ #define VFIO_IRQ_SET_ACTION_UNMASK (1 << 4) /* Unmask interrupt */ #define VFIO_IRQ_SET_ACTION_TRIGGER (1 << 5) /* Trigger interrupt */ __u32 index; __u32 start; __u32 count; __u8 data[]; }; #define VFIO_DEVICE_SET_IRQS _IO(VFIO_TYPE, VFIO_BASE + 10) #define VFIO_IRQ_SET_DATA_TYPE_MASK (VFIO_IRQ_SET_DATA_NONE | \ VFIO_IRQ_SET_DATA_BOOL | \ VFIO_IRQ_SET_DATA_EVENTFD) #define VFIO_IRQ_SET_ACTION_TYPE_MASK (VFIO_IRQ_SET_ACTION_MASK | \ VFIO_IRQ_SET_ACTION_UNMASK | \ VFIO_IRQ_SET_ACTION_TRIGGER) /** * VFIO_DEVICE_RESET - _IO(VFIO_TYPE, VFIO_BASE + 11) * * Reset a device. */ #define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11) /* * The VFIO-PCI bus driver makes use of the following fixed region and * IRQ index mapping. Unimplemented regions return a size of zero. * Unimplemented IRQ types return a count of zero. */ enum { VFIO_PCI_BAR0_REGION_INDEX, VFIO_PCI_BAR1_REGION_INDEX, VFIO_PCI_BAR2_REGION_INDEX, VFIO_PCI_BAR3_REGION_INDEX, VFIO_PCI_BAR4_REGION_INDEX, VFIO_PCI_BAR5_REGION_INDEX, VFIO_PCI_ROM_REGION_INDEX, VFIO_PCI_CONFIG_REGION_INDEX, VFIO_PCI_NUM_REGIONS }; enum { VFIO_PCI_INTX_IRQ_INDEX, VFIO_PCI_MSI_IRQ_INDEX, VFIO_PCI_MSIX_IRQ_INDEX, VFIO_PCI_NUM_IRQS }; /* -------- API for Type1 VFIO IOMMU -------- */ /** * VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct vfio_iommu_info) * * Retrieve information about the IOMMU object. Fills in provided * struct vfio_iommu_info. Caller sets argsz. * * XXX Should we do these by CHECK_EXTENSION too? */ struct vfio_iommu_type1_info { __u32 argsz; __u32 flags; #define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */ __u64 iova_pgsizes; /* Bitmap of supported page sizes */ }; #define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12) /** * VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map) * * Map process virtual addresses to IO virtual addresses using the * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required. */ struct vfio_iommu_type1_dma_map { __u32 argsz; __u32 flags; #define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */ #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */ __u64 vaddr; /* Process virtual address */ __u64 iova; /* IO virtual address */ __u64 size; /* Size of mapping (bytes) */ }; #define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13) /** * VFIO_IOMMU_UNMAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct vfio_dma_unmap) * * Unmap IO virtual addresses using the provided struct vfio_dma_unmap. * Caller sets argsz. */ struct vfio_iommu_type1_dma_unmap { __u32 argsz; __u32 flags; __u64 iova; /* IO virtual address */ __u64 size; /* Size of mapping (bytes) */ }; #define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14) #endif /* VFIO_H */