Re: [Qemu-devel] [PATCH 1/3] vfio: Import vfio kernel header

[Jan Kiszka <jan.kiszka@web.de>]

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On 2012-08-01 07:18, Alex Williamson wrote:
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> ---
> 
>  linux-headers/linux/vfio.h |  368 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 368 insertions(+)
>  create mode 100644 linux-headers/linux/vfio.h
> 
> diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
> new file mode 100644
> index 0000000..f787b72
> --- /dev/null
> +++ b/linux-headers/linux/vfio.h
> @@ -0,0 +1,368 @@
> +/*
> + * VFIO API definition
> + *
> + * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
> + *     Author: Alex Williamson <alex.williamson@redhat.com>
> + *
> + * 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 <linux/types.h>
> +#include <linux/ioctl.h>
> +
> +#define VFIO_API_VERSION	0
> +
> +
> +/* 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 */
> 

Please patch update-linux-headers.sh and let it do its work instead
(separate patches).

Jan


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