Impressum vfio.h
Sprache: C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* 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 _UAPIVFIO_H
#define _UAPIVFIO_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
#define VFIO_SPAPR_TCE_IOMMU 2
#define VFIO_TYPE1v2_IOMMU 3
/*
* IOMMU enforces DMA cache coherence ( ex . PCIe NoSnoop stripping ) . This
* capability is subject to change as groups are added or removed .
*/
#define VFIO_DMA_CC_IOMMU 4
/* Check if EEH is supported */
#define VFIO_EEH 5
/* Two-stage IOMMU */
#define __VFIO_RESERVED_TYPE1_NESTING_IOMMU 6 /* Implies v2 */
#define VFIO_SPAPR_TCE_v2_IOMMU 7
/*
* The No - IOMMU IOMMU offers no translation or isolation for devices and
* supports no ioctls outside of VFIO_CHECK_EXTENSION . Use of VFIO ' s No - IOMMU
* code will taint the host kernel and should be used with extreme caution .
*/
#define VFIO_NOIOMMU_IOMMU 8
/* Supports VFIO_DMA_UNMAP_FLAG_ALL */
#define VFIO_UNMAP_ALL 9
/*
* Supports the vaddr flag for DMA map and unmap . Not supported for mediated
* devices , so this capability is subject to change as groups are added or
* removed .
*/
#define VFIO_UPDATE_VADDR 10
/*
* 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
/*
* For extension of INFO ioctls , VFIO makes use of a capability chain
* designed after PCI / e capabilities . A flag bit indicates whether
* this capability chain is supported and a field defined in the fixed
* structure defines the offset of the first capability in the chain .
* This field is only valid when the corresponding bit in the flags
* bitmap is set . This offset field is relative to the start of the
* INFO buffer , as is the next field within each capability header .
* The id within the header is a shared address space per INFO ioctl ,
* while the version field is specific to the capability id . The
* contents following the header are specific to the capability id .
*/
struct vfio_info_cap_header {
__u16 id; /* Identifies capability */
__u16 version; /* Version specific to the capability ID */
__u32 next; /* Offset of next capability */
};
/*
* Callers of INFO ioctls passing insufficiently sized buffers will see
* the capability chain flag bit set , a zero value for the first capability
* offset ( if available within the provided argsz ) , and argsz will be
* updated to report the necessary buffer size . For compatibility , the
* INFO ioctl will not report error in this case , but the capability chain
* will not be available .
*/
/* -------- 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 */
#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2 ) /* vfio-platform device */
#define VFIO_DEVICE_FLAGS_AMBA (1 << 3 ) /* vfio-amba device */
#define VFIO_DEVICE_FLAGS_CCW (1 << 4 ) /* vfio-ccw device */
#define VFIO_DEVICE_FLAGS_AP (1 << 5 ) /* vfio-ap device */
#define VFIO_DEVICE_FLAGS_FSL_MC (1 << 6 ) /* vfio-fsl-mc device */
#define VFIO_DEVICE_FLAGS_CAPS (1 << 7 ) /* Info supports caps */
#define VFIO_DEVICE_FLAGS_CDX (1 << 8 ) /* vfio-cdx device */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
__u32 cap_offset; /* Offset within info struct of first cap */
__u32 pad;
};
#define VFIO_DEVICE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 7 )
/*
* Vendor driver using Mediated device framework should provide device_api
* attribute in supported type attribute groups . Device API string should be one
* of the following corresponding to device flags in vfio_device_info structure .
*/
#define VFIO_DEVICE_API_PCI_STRING "vfio-pci"
#define VFIO_DEVICE_API_PLATFORM_STRING "vfio-platform"
#define VFIO_DEVICE_API_AMBA_STRING "vfio-amba"
#define VFIO_DEVICE_API_CCW_STRING "vfio-ccw"
#define VFIO_DEVICE_API_AP_STRING "vfio-ap"
/*
* The following capabilities are unique to s390 zPCI devices . Their contents
* are further - defined in vfio_zdev . h
*/
#define VFIO_DEVICE_INFO_CAP_ZPCI_BASE 1
#define VFIO_DEVICE_INFO_CAP_ZPCI_GROUP 2
#define VFIO_DEVICE_INFO_CAP_ZPCI_UTIL 3
#define VFIO_DEVICE_INFO_CAP_ZPCI_PFIP 4
/*
* The following VFIO_DEVICE_INFO capability reports support for PCIe AtomicOp
* completion to the root bus with supported widths provided via flags .
*/
#define VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP 5
struct vfio_device_info_cap_pci_atomic_comp {
struct vfio_info_cap_header header;
__u32 flags;
#define VFIO_PCI_ATOMIC_COMP32 (1 << 0 )
#define VFIO_PCI_ATOMIC_COMP64 (1 << 1 )
#define VFIO_PCI_ATOMIC_COMP128 (1 << 2 )
__u32 reserved;
};
/**
* 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 */
#define VFIO_REGION_INFO_FLAG_CAPS (1 << 3 ) /* Info supports caps */
__u32 index; /* Region index */
__u32 cap_offset; /* Offset within info struct of first cap */
__aligned_u64 size; /* Region size (bytes) */
__aligned_u64 offset; /* Region offset from start of device fd */
};
#define VFIO_DEVICE_GET_REGION_INFO _IO(VFIO_TYPE, VFIO_BASE + 8 )
/*
* The sparse mmap capability allows finer granularity of specifying areas
* within a region with mmap support . When specified , the user should only
* mmap the offset ranges specified by the areas array . mmaps outside of the
* areas specified may fail ( such as the range covering a PCI MSI - X table ) or
* may result in improper device behavior .
*
* The structures below define version 1 of this capability .
*/
#define VFIO_REGION_INFO_CAP_SPARSE_MMAP 1
struct vfio_region_sparse_mmap_area {
__aligned_u64 offset; /* Offset of mmap'able area within region */
__aligned_u64 size; /* Size of mmap'able area */
};
struct vfio_region_info_cap_sparse_mmap {
struct vfio_info_cap_header header;
__u32 nr_areas;
__u32 reserved;
struct vfio_region_sparse_mmap_area areas[];
};
/*
* The device specific type capability allows regions unique to a specific
* device or class of devices to be exposed . This helps solve the problem for
* vfio bus drivers of defining which region indexes correspond to which region
* on the device , without needing to resort to static indexes , as done by
* vfio - pci . For instance , if we were to go back in time , we might remove
* VFIO_PCI_VGA_REGION_INDEX and let vfio - pci simply define that all indexes
* greater than or equal to VFIO_PCI_NUM_REGIONS are device specific and we ' d
* make a " VGA " device specific type to describe the VGA access space . This
* means that non - VGA devices wouldn ' t need to waste this index , and thus the
* address space associated with it due to implementation of device file
* descriptor offsets in vfio - pci .
*
* The current implementation is now part of the user ABI , so we can ' t use this
* for VGA , but there are other upcoming use cases , such as opregions for Intel
* IGD devices and framebuffers for vGPU devices . We missed VGA , but we ' ll
* use this for future additions .
*
* The structure below defines version 1 of this capability .
*/
#define VFIO_REGION_INFO_CAP_TYPE 2
struct vfio_region_info_cap_type {
struct vfio_info_cap_header header;
__u32 type; /* global per bus driver */
__u32 subtype; /* type specific */
};
/*
* List of region types , global per bus driver .
* If you introduce a new type , please add it here .
*/
/* PCI region type containing a PCI vendor part */
#define VFIO_REGION_TYPE_PCI_VENDOR_TYPE (1 << 31 )
#define VFIO_REGION_TYPE_PCI_VENDOR_MASK (0 xffff)
#define VFIO_REGION_TYPE_GFX (1 )
#define VFIO_REGION_TYPE_CCW (2 )
#define VFIO_REGION_TYPE_MIGRATION_DEPRECATED (3 )
/* sub-types for VFIO_REGION_TYPE_PCI_* */
/* 8086 vendor PCI sub-types */
#define VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION (1 )
#define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG (2 )
#define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG (3 )
/* 10de vendor PCI sub-types */
/*
* NVIDIA GPU NVlink2 RAM is coherent RAM mapped onto the host address space .
*
* Deprecated , region no longer provided
*/
#define VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM (1 )
/* 1014 vendor PCI sub-types */
/*
* IBM NPU NVlink2 ATSD ( Address Translation Shootdown ) register of NPU
* to do TLB invalidation on a GPU .
*
* Deprecated , region no longer provided
*/
#define VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD (1 )
/* sub-types for VFIO_REGION_TYPE_GFX */
#define VFIO_REGION_SUBTYPE_GFX_EDID (1 )
/**
* struct vfio_region_gfx_edid - EDID region layout .
*
* Set display link state and EDID blob .
*
* The EDID blob has monitor information such as brand , name , serial
* number , physical size , supported video modes and more .
*
* This special region allows userspace ( typically qemu ) set a virtual
* EDID for the virtual monitor , which allows a flexible display
* configuration .
*
* For the edid blob spec look here :
* https : //en.wikipedia.org/wiki/Extended_Display_Identification_Data
*
* On linux systems you can find the EDID blob in sysfs :
* / sys / class / drm / $ { card } / $ { connector } / edid
*
* You can use the edid - decode ulility ( comes with xorg - x11 - utils ) to
* decode the EDID blob .
*
* @ edid_offset : location of the edid blob , relative to the
* start of the region ( readonly ) .
* @ edid_max_size : max size of the edid blob ( readonly ) .
* @ edid_size : actual edid size ( read / write ) .
* @ link_state : display link state ( read / write ) .
* VFIO_DEVICE_GFX_LINK_STATE_UP : Monitor is turned on .
* VFIO_DEVICE_GFX_LINK_STATE_DOWN : Monitor is turned off .
* @ max_xres : max display width ( 0 = = no limitation , readonly ) .
* @ max_yres : max display height ( 0 = = no limitation , readonly ) .
*
* EDID update protocol :
* ( 1 ) set link - state to down .
* ( 2 ) update edid blob and size .
* ( 3 ) set link - state to up .
*/
struct vfio_region_gfx_edid {
__u32 edid_offset;
__u32 edid_max_size;
__u32 edid_size;
__u32 max_xres;
__u32 max_yres;
__u32 link_state;
#define VFIO_DEVICE_GFX_LINK_STATE_UP 1
#define VFIO_DEVICE_GFX_LINK_STATE_DOWN 2
};
/* sub-types for VFIO_REGION_TYPE_CCW */
#define VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD (1 )
#define VFIO_REGION_SUBTYPE_CCW_SCHIB (2 )
#define VFIO_REGION_SUBTYPE_CCW_CRW (3 )
/* sub-types for VFIO_REGION_TYPE_MIGRATION */
#define VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED (1 )
struct vfio_device_migration_info {
__u32 device_state; /* VFIO device state */
#define VFIO_DEVICE_STATE_V1_STOP (0 )
#define VFIO_DEVICE_STATE_V1_RUNNING (1 << 0 )
#define VFIO_DEVICE_STATE_V1_SAVING (1 << 1 )
#define VFIO_DEVICE_STATE_V1_RESUMING (1 << 2 )
#define VFIO_DEVICE_STATE_MASK (VFIO_DEVICE_STATE_V1_RUNNING | \
VFIO_DEVICE_STATE_V1_SAVING | \
VFIO_DEVICE_STATE_V1_RESUMING)
#define VFIO_DEVICE_STATE_VALID(state) \
(state & VFIO_DEVICE_STATE_V1_RESUMING ? \
(state & VFIO_DEVICE_STATE_MASK) == VFIO_DEVICE_STATE_V1_RESUMING : 1 )
#define VFIO_DEVICE_STATE_IS_ERROR(state) \
((state & VFIO_DEVICE_STATE_MASK) == (VFIO_DEVICE_STATE_V1_SAVING | \
VFIO_DEVICE_STATE_V1_RESUMING))
#define VFIO_DEVICE_STATE_SET_ERROR(state) \
((state & ~VFIO_DEVICE_STATE_MASK) | VFIO_DEVICE_STATE_V1_SAVING | \
VFIO_DEVICE_STATE_V1_RESUMING)
__u32 reserved;
__aligned_u64 pending_bytes;
__aligned_u64 data_offset;
__aligned_u64 data_size;
};
/*
* The MSIX mappable capability informs that MSIX data of a BAR can be mmapped
* which allows direct access to non - MSIX registers which happened to be within
* the same system page .
*
* Even though the userspace gets direct access to the MSIX data , the existing
* VFIO_DEVICE_SET_IRQS interface must still be used for MSIX configuration .
*/
#define VFIO_REGION_INFO_CAP_MSIX_MAPPABLE 3
/*
* Capability with compressed real address ( aka SSA - small system address )
* where GPU RAM is mapped on a system bus . Used by a GPU for DMA routing
* and by the userspace to associate a NVLink bridge with a GPU .
*
* Deprecated , capability no longer provided
*/
#define VFIO_REGION_INFO_CAP_NVLINK2_SSATGT 4
struct vfio_region_info_cap_nvlink2_ssatgt {
struct vfio_info_cap_header header;
__aligned_u64 tgt;
};
/*
* Capability with an NVLink link speed . The value is read by
* the NVlink2 bridge driver from the bridge ' s " ibm , nvlink - speed "
* property in the device tree . The value is fixed in the hardware
* and failing to provide the correct value results in the link
* not working with no indication from the driver why .
*
* Deprecated , capability no longer provided
*/
#define VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD 5
struct vfio_region_info_cap_nvlink2_lnkspd {
struct vfio_info_cap_header header;
__u32 link_speed;
__u32 __pad;
};
/**
* 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 .
* Absence of the NORESIZE flag indicates that vectors can be enabled
* and disabled dynamically without impacting other vectors within the
* index .
*/
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,
/*
* Expose VGA regions defined for PCI base class 03 , subclass 00 .
* This includes I / O port ranges 0 x3b0 to 0 x3bb and 0 x3c0 to 0 x3df
* as well as the MMIO range 0 xa0000 to 0 xbffff . Each implemented
* range is found at it ' s identity mapped offset from the region
* offset , for example 0 x3b0 is region_info . offset + 0 x3b0 . Areas
* between described ranges are unimplemented .
*/
VFIO_PCI_VGA_REGION_INDEX,
VFIO_PCI_NUM_REGIONS = 9 /* Fixed user ABI, region indexes >=9 use */
/* device specific cap to define content. */
};
enum {
VFIO_PCI_INTX_IRQ_INDEX,
VFIO_PCI_MSI_IRQ_INDEX,
VFIO_PCI_MSIX_IRQ_INDEX,
VFIO_PCI_ERR_IRQ_INDEX,
VFIO_PCI_REQ_IRQ_INDEX,
VFIO_PCI_NUM_IRQS
};
/*
* The vfio - ccw 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_CCW_CONFIG_REGION_INDEX,
VFIO_CCW_NUM_REGIONS
};
enum {
VFIO_CCW_IO_IRQ_INDEX,
VFIO_CCW_CRW_IRQ_INDEX,
VFIO_CCW_REQ_IRQ_INDEX,
VFIO_CCW_NUM_IRQS
};
/*
* The vfio - ap bus driver makes use of the following IRQ index mapping .
* Unimplemented IRQ types return a count of zero .
*/
enum {
VFIO_AP_REQ_IRQ_INDEX,
VFIO_AP_CFG_CHG_IRQ_INDEX,
VFIO_AP_NUM_IRQS
};
/**
* VFIO_DEVICE_GET_PCI_HOT_RESET_INFO - _ IOWR ( VFIO_TYPE , VFIO_BASE + 12 ,
* struct vfio_pci_hot_reset_info )
*
* This command is used to query the affected devices in the hot reset for
* a given device .
*
* This command always reports the segment , bus , and devfn information for
* each affected device , and selectively reports the group_id or devid per
* the way how the calling device is opened .
*
* - If the calling device is opened via the traditional group / container
* API , group_id is reported . User should check if it has owned all
* the affected devices and provides a set of group fds to prove the
* ownership in VFIO_DEVICE_PCI_HOT_RESET ioctl .
*
* - If the calling device is opened as a cdev , devid is reported .
* Flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set to indicate this
* data type . All the affected devices should be represented in
* the dev_set , ex . bound to a vfio driver , and also be owned by
* this interface which is determined by the following conditions :
* 1 ) Has a valid devid within the iommufd_ctx of the calling device .
* Ownership cannot be determined across separate iommufd_ctx and
* the cdev calling conventions do not support a proof - of - ownership
* model as provided in the legacy group interface . In this case
* valid devid with value greater than zero is provided in the return
* structure .
* 2 ) Does not have a valid devid within the iommufd_ctx of the calling
* device , but belongs to the same IOMMU group as the calling device
* or another opened device that has a valid devid within the
* iommufd_ctx of the calling device . This provides implicit ownership
* for devices within the same DMA isolation context . In this case
* the devid value of VFIO_PCI_DEVID_OWNED is provided in the return
* structure .
*
* A devid value of VFIO_PCI_DEVID_NOT_OWNED is provided in the return
* structure for affected devices where device is NOT represented in the
* dev_set or ownership is not available . Such devices prevent the use
* of VFIO_DEVICE_PCI_HOT_RESET ioctl outside of the proof - of - ownership
* calling conventions ( ie . via legacy group accessed devices ) . Flag
* VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED would be set when all the
* affected devices are represented in the dev_set and also owned by
* the user . This flag is available only when
* flag VFIO_PCI_HOT_RESET_FLAG_DEV_ID is set , otherwise reserved .
* When set , user could invoke VFIO_DEVICE_PCI_HOT_RESET with a zero
* length fd array on the calling device as the ownership is validated
* by iommufd_ctx .
*
* Return : 0 on success , - errno on failure :
* - enospc = insufficient buffer , - enodev = unsupported for device .
*/
struct vfio_pci_dependent_device {
union {
__u32 group_id;
__u32 devid;
#define VFIO_PCI_DEVID_OWNED 0
#define VFIO_PCI_DEVID_NOT_OWNED -1
};
__u16 segment;
__u8 bus;
__u8 devfn; /* Use PCI_SLOT/PCI_FUNC */
};
struct vfio_pci_hot_reset_info {
__u32 argsz;
__u32 flags;
#define VFIO_PCI_HOT_RESET_FLAG_DEV_ID (1 << 0 )
#define VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED (1 << 1 )
__u32 count;
struct vfio_pci_dependent_device devices[];
};
#define VFIO_DEVICE_GET_PCI_HOT_RESET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12 )
/**
* VFIO_DEVICE_PCI_HOT_RESET - _ IOW ( VFIO_TYPE , VFIO_BASE + 13 ,
* struct vfio_pci_hot_reset )
*
* A PCI hot reset results in either a bus or slot reset which may affect
* other devices sharing the bus / slot . The calling user must have
* ownership of the full set of affected devices as determined by the
* VFIO_DEVICE_GET_PCI_HOT_RESET_INFO ioctl .
*
* When called on a device file descriptor acquired through the vfio
* group interface , the user is required to provide proof of ownership
* of those affected devices via the group_fds array in struct
* vfio_pci_hot_reset .
*
* When called on a direct cdev opened vfio device , the flags field of
* struct vfio_pci_hot_reset_info reports the ownership status of the
* affected devices and this ioctl must be called with an empty group_fds
* array . See above INFO ioctl definition for ownership requirements .
*
* Mixed usage of legacy groups and cdevs across the set of affected
* devices is not supported .
*
* Return : 0 on success , - errno on failure .
*/
struct vfio_pci_hot_reset {
__u32 argsz;
__u32 flags;
__u32 count;
__s32 group_fds[];
};
#define VFIO_DEVICE_PCI_HOT_RESET _IO(VFIO_TYPE, VFIO_BASE + 13 )
/**
* VFIO_DEVICE_QUERY_GFX_PLANE - _ IOW ( VFIO_TYPE , VFIO_BASE + 14 ,
* struct vfio_device_query_gfx_plane )
*
* Set the drm_plane_type and flags , then retrieve the gfx plane info .
*
* flags supported :
* - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_DMABUF are set
* to ask if the mdev supports dma - buf . 0 on support , - EINVAL on no
* support for dma - buf .
* - VFIO_GFX_PLANE_TYPE_PROBE and VFIO_GFX_PLANE_TYPE_REGION are set
* to ask if the mdev supports region . 0 on support , - EINVAL on no
* support for region .
* - VFIO_GFX_PLANE_TYPE_DMABUF or VFIO_GFX_PLANE_TYPE_REGION is set
* with each call to query the plane info .
* - Others are invalid and return - EINVAL .
*
* Note :
* 1 . Plane could be disabled by guest . In that case , success will be
* returned with zero - initialized drm_format , size , width and height
* fields .
* 2 . x_hot / y_hot is set to 0 xFFFFFFFF if no hotspot information available
*
* Return : 0 on success , - errno on other failure .
*/
struct vfio_device_gfx_plane_info {
__u32 argsz;
__u32 flags;
#define VFIO_GFX_PLANE_TYPE_PROBE (1 << 0 )
#define VFIO_GFX_PLANE_TYPE_DMABUF (1 << 1 )
#define VFIO_GFX_PLANE_TYPE_REGION (1 << 2 )
/* in */
__u32 drm_plane_type; /* type of plane: DRM_PLANE_TYPE_* */
/* out */
__u32 drm_format; /* drm format of plane */
__aligned_u64 drm_format_mod; /* tiled mode */
__u32 width; /* width of plane */
__u32 height; /* height of plane */
__u32 stride; /* stride of plane */
__u32 size; /* size of plane in bytes, align on page*/
__u32 x_pos; /* horizontal position of cursor plane */
__u32 y_pos; /* vertical position of cursor plane*/
__u32 x_hot; /* horizontal position of cursor hotspot */
__u32 y_hot; /* vertical position of cursor hotspot */
union {
__u32 region_index; /* region index */
__u32 dmabuf_id; /* dma-buf id */
};
__u32 reserved;
};
#define VFIO_DEVICE_QUERY_GFX_PLANE _IO(VFIO_TYPE, VFIO_BASE + 14 )
/**
* VFIO_DEVICE_GET_GFX_DMABUF - _ IOW ( VFIO_TYPE , VFIO_BASE + 15 , _ _ u32 )
*
* Return a new dma - buf file descriptor for an exposed guest framebuffer
* described by the provided dmabuf_id . The dmabuf_id is returned from VFIO_
* DEVICE_QUERY_GFX_PLANE as a token of the exposed guest framebuffer .
*/
#define VFIO_DEVICE_GET_GFX_DMABUF _IO(VFIO_TYPE, VFIO_BASE + 15 )
/**
* VFIO_DEVICE_IOEVENTFD - _ IOW ( VFIO_TYPE , VFIO_BASE + 16 ,
* struct vfio_device_ioeventfd )
*
* Perform a write to the device at the specified device fd offset , with
* the specified data and width when the provided eventfd is triggered .
* vfio bus drivers may not support this for all regions , for all widths ,
* or at all . vfio - pci currently only enables support for BAR regions ,
* excluding the MSI - X vector table .
*
* Return : 0 on success , - errno on failure .
*/
struct vfio_device_ioeventfd {
__u32 argsz;
__u32 flags;
#define VFIO_DEVICE_IOEVENTFD_8 (1 << 0 ) /* 1-byte write */
#define VFIO_DEVICE_IOEVENTFD_16 (1 << 1 ) /* 2-byte write */
#define VFIO_DEVICE_IOEVENTFD_32 (1 << 2 ) /* 4-byte write */
#define VFIO_DEVICE_IOEVENTFD_64 (1 << 3 ) /* 8-byte write */
#define VFIO_DEVICE_IOEVENTFD_SIZE_MASK (0 xf)
__aligned_u64 offset; /* device fd offset of write */
__aligned_u64 data; /* data to be written */
__s32 fd; /* -1 for de-assignment */
__u32 reserved;
};
#define VFIO_DEVICE_IOEVENTFD _IO(VFIO_TYPE, VFIO_BASE + 16 )
/**
* VFIO_DEVICE_FEATURE - _ IOWR ( VFIO_TYPE , VFIO_BASE + 17 ,
* struct vfio_device_feature )
*
* Get , set , or probe feature data of the device . The feature is selected
* using the FEATURE_MASK portion of the flags field . Support for a feature
* can be probed by setting both the FEATURE_MASK and PROBE bits . A probe
* may optionally include the GET and / or SET bits to determine read vs write
* access of the feature respectively . Probing a feature will return success
* if the feature is supported and all of the optionally indicated GET / SET
* methods are supported . The format of the data portion of the structure is
* specific to the given feature . The data portion is not required for
* probing . GET and SET are mutually exclusive , except for use with PROBE .
*
* Return 0 on success , - errno on failure .
*/
struct vfio_device_feature {
__u32 argsz;
__u32 flags;
#define VFIO_DEVICE_FEATURE_MASK (0 xffff) /* 16-bit feature index */
#define VFIO_DEVICE_FEATURE_GET (1 << 16 ) /* Get feature into data[] */
#define VFIO_DEVICE_FEATURE_SET (1 << 17 ) /* Set feature from data[] */
#define VFIO_DEVICE_FEATURE_PROBE (1 << 18 ) /* Probe feature support */
__u8 data[];
};
#define VFIO_DEVICE_FEATURE _IO(VFIO_TYPE, VFIO_BASE + 17 )
/*
* VFIO_DEVICE_BIND_IOMMUFD - _ IOR ( VFIO_TYPE , VFIO_BASE + 18 ,
* struct vfio_device_bind_iommufd )
* @ argsz : User filled size of this data .
* @ flags : Must be 0 or a bit flags of VFIO_DEVICE_BIND_ *
* @ iommufd : iommufd to bind .
* @ out_devid : The device id generated by this bind . devid is a handle for
* this device / iommufd bond and can be used in IOMMUFD commands .
* @ token_uuid_ptr : Valid if VFIO_DEVICE_BIND_FLAG_TOKEN . Points to a 16 byte
* UUID in the same format as VFIO_DEVICE_FEATURE_PCI_VF_TOKEN .
*
* Bind a vfio_device to the specified iommufd .
*
* User is restricted from accessing the device before the binding operation
* is completed . Only allowed on cdev fds .
*
* Unbind is automatically conducted when device fd is closed .
*
* A token is sometimes required to open the device , unless this is known to be
* needed VFIO_DEVICE_BIND_FLAG_TOKEN should not be set and token_uuid_ptr is
* ignored . The only case today is a PF / VF relationship where the VF bind must
* be provided the same token as VFIO_DEVICE_FEATURE_PCI_VF_TOKEN provided to
* the PF .
*
* Return : 0 on success , - errno on failure .
*/
struct vfio_device_bind_iommufd {
__u32 argsz;
__u32 flags;
#define VFIO_DEVICE_BIND_FLAG_TOKEN (1 << 0 )
__s32 iommufd;
__u32 out_devid;
__aligned_u64 token_uuid_ptr;
};
#define VFIO_DEVICE_BIND_IOMMUFD _IO(VFIO_TYPE, VFIO_BASE + 18 )
/*
* VFIO_DEVICE_ATTACH_IOMMUFD_PT - _ IOW ( VFIO_TYPE , VFIO_BASE + 19 ,
* struct vfio_device_attach_iommufd_pt )
* @ argsz : User filled size of this data .
* @ flags : Flags for attach .
* @ pt_id : Input the target id which can represent an ioas or a hwpt
* allocated via iommufd subsystem .
* Output the input ioas id or the attached hwpt id which could
* be the specified hwpt itself or a hwpt automatically created
* for the specified ioas by kernel during the attachment .
* @ pasid : The pasid to be attached , only meaningful when
* VFIO_DEVICE_ATTACH_PASID is set in @ flags
*
* Associate the device with an address space within the bound iommufd .
* Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close . This is only
* allowed on cdev fds .
*
* If a vfio device or a pasid of this device is currently attached to a valid
* hw_pagetable ( hwpt ) , without doing a VFIO_DEVICE_DETACH_IOMMUFD_PT , a second
* VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl passing in another hwpt id is allowed .
* This action , also known as a hw_pagetable replacement , will replace the
* currently attached hwpt of the device or the pasid of this device with a new
* hwpt corresponding to the given pt_id .
*
* Return : 0 on success , - errno on failure .
*/
struct vfio_device_attach_iommufd_pt {
__u32 argsz;
__u32 flags;
#define VFIO_DEVICE_ATTACH_PASID (1 << 0 )
__u32 pt_id;
__u32 pasid;
};
#define VFIO_DEVICE_ATTACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 19 )
/*
* VFIO_DEVICE_DETACH_IOMMUFD_PT - _ IOW ( VFIO_TYPE , VFIO_BASE + 20 ,
* struct vfio_device_detach_iommufd_pt )
* @ argsz : User filled size of this data .
* @ flags : Flags for detach .
* @ pasid : The pasid to be detached , only meaningful when
* VFIO_DEVICE_DETACH_PASID is set in @ flags
*
* Remove the association of the device or a pasid of the device and its current
* associated address space . After it , the device or the pasid should be in a
* blocking DMA state . This is only allowed on cdev fds .
*
* Return : 0 on success , - errno on failure .
*/
struct vfio_device_detach_iommufd_pt {
__u32 argsz;
__u32 flags;
#define VFIO_DEVICE_DETACH_PASID (1 << 0 )
__u32 pasid;
};
#define VFIO_DEVICE_DETACH_IOMMUFD_PT _IO(VFIO_TYPE, VFIO_BASE + 20 )
/*
* Provide support for setting a PCI VF Token , which is used as a shared
* secret between PF and VF drivers . This feature may only be set on a
* PCI SR - IOV PF when SR - IOV is enabled on the PF and there are no existing
* open VFs . Data provided when setting this feature is a 16 - byte array
* ( _ _ u8 b [ 16 ] ) , representing a UUID .
*/
#define VFIO_DEVICE_FEATURE_PCI_VF_TOKEN (0 )
/*
* Indicates the device can support the migration API through
* VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE . If this GET succeeds , the RUNNING and
* ERROR states are always supported . Support for additional states is
* indicated via the flags field ; at least VFIO_MIGRATION_STOP_COPY must be
* set .
*
* VFIO_MIGRATION_STOP_COPY means that STOP , STOP_COPY and
* RESUMING are supported .
*
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P means that RUNNING_P2P
* is supported in addition to the STOP_COPY states .
*
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_PRE_COPY means that
* PRE_COPY is supported in addition to the STOP_COPY states .
*
* VFIO_MIGRATION_STOP_COPY | VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY
* means that RUNNING_P2P , PRE_COPY and PRE_COPY_P2P are supported
* in addition to the STOP_COPY states .
*
* Other combinations of flags have behavior to be defined in the future .
*/
struct vfio_device_feature_migration {
__aligned_u64 flags;
#define VFIO_MIGRATION_STOP_COPY (1 << 0 )
#define VFIO_MIGRATION_P2P (1 << 1 )
#define VFIO_MIGRATION_PRE_COPY (1 << 2 )
};
#define VFIO_DEVICE_FEATURE_MIGRATION 1
/*
* Upon VFIO_DEVICE_FEATURE_SET , execute a migration state change on the VFIO
* device . The new state is supplied in device_state , see enum
* vfio_device_mig_state for details
*
* The kernel migration driver must fully transition the device to the new state
* value before the operation returns to the user .
*
* The kernel migration driver must not generate asynchronous device state
* transitions outside of manipulation by the user or the VFIO_DEVICE_RESET
* ioctl as described above .
*
* If this function fails then current device_state may be the original
* operating state or some other state along the combination transition path .
* The user can then decide if it should execute a VFIO_DEVICE_RESET , attempt
* to return to the original state , or attempt to return to some other state
* such as RUNNING or STOP .
*
* If the new_state starts a new data transfer session then the FD associated
* with that session is returned in data_fd . The user is responsible to close
* this FD when it is finished . The user must consider the migration data stream
* carried over the FD to be opaque and must preserve the byte order of the
* stream . The user is not required to preserve buffer segmentation when writing
* the data stream during the RESUMING operation .
*
* Upon VFIO_DEVICE_FEATURE_GET , get the current migration state of the VFIO
* device , data_fd will be - 1 .
*/
struct vfio_device_feature_mig_state {
__u32 device_state; /* From enum vfio_device_mig_state */
__s32 data_fd;
};
#define VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE 2
/*
* The device migration Finite State Machine is described by the enum
* vfio_device_mig_state . Some of the FSM arcs will create a migration data
* transfer session by returning a FD , in this case the migration data will
* flow over the FD using read ( ) and write ( ) as discussed below .
*
* There are 5 states to support VFIO_MIGRATION_STOP_COPY :
* RUNNING - The device is running normally
* STOP - The device does not change the internal or external state
* STOP_COPY - The device internal state can be read out
* RESUMING - The device is stopped and is loading a new internal state
* ERROR - The device has failed and must be reset
*
* And optional states to support VFIO_MIGRATION_P2P :
* RUNNING_P2P - RUNNING , except the device cannot do peer to peer DMA
* And VFIO_MIGRATION_PRE_COPY :
* PRE_COPY - The device is running normally but tracking internal state
* changes
* And VFIO_MIGRATION_P2P | VFIO_MIGRATION_PRE_COPY :
* PRE_COPY_P2P - PRE_COPY , except the device cannot do peer to peer DMA
*
* The FSM takes actions on the arcs between FSM states . The driver implements
* the following behavior for the FSM arcs :
*
* RUNNING_P2P - > STOP
* STOP_COPY - > STOP
* While in STOP the device must stop the operation of the device . The device
* must not generate interrupts , DMA , or any other change to external state .
* It must not change its internal state . When stopped the device and kernel
* migration driver must accept and respond to interaction to support external
* subsystems in the STOP state , for example PCI MSI - X and PCI config space .
* Failure by the user to restrict device access while in STOP must not result
* in error conditions outside the user context ( ex . host system faults ) .
*
* The STOP_COPY arc will terminate a data transfer session .
*
* RESUMING - > STOP
* Leaving RESUMING terminates a data transfer session and indicates the
* device should complete processing of the data delivered by write ( ) . The
* kernel migration driver should complete the incorporation of data written
* to the data transfer FD into the device internal state and perform
* final validity and consistency checking of the new device state . If the
* user provided data is found to be incomplete , inconsistent , or otherwise
* invalid , the migration driver must fail the SET_STATE ioctl and
* optionally go to the ERROR state as described below .
*
* While in STOP the device has the same behavior as other STOP states
* described above .
*
* To abort a RESUMING session the device must be reset .
*
* PRE_COPY - > RUNNING
* RUNNING_P2P - > RUNNING
* While in RUNNING the device is fully operational , the device may generate
* interrupts , DMA , respond to MMIO , all vfio device regions are functional ,
* and the device may advance its internal state .
*
* The PRE_COPY arc will terminate a data transfer session .
*
* PRE_COPY_P2P - > RUNNING_P2P
* RUNNING - > RUNNING_P2P
* STOP - > RUNNING_P2P
* While in RUNNING_P2P the device is partially running in the P2P quiescent
* state defined below .
*
* The PRE_COPY_P2P arc will terminate a data transfer session .
*
* RUNNING - > PRE_COPY
* RUNNING_P2P - > PRE_COPY_P2P
* STOP - > STOP_COPY
* PRE_COPY , PRE_COPY_P2P and STOP_COPY form the " saving group " of states
* which share a data transfer session . Moving between these states alters
* what is streamed in session , but does not terminate or otherwise affect
* the associated fd .
*
* These arcs begin the process of saving the device state and will return a
* new data_fd . The migration driver may perform actions such as enabling
* dirty logging of device state when entering PRE_COPY or PER_COPY_P2P .
*
* Each arc does not change the device operation , the device remains
* RUNNING , P2P quiesced or in STOP . The STOP_COPY state is described below
* in PRE_COPY_P2P - > STOP_COPY .
*
* PRE_COPY - > PRE_COPY_P2P
* Entering PRE_COPY_P2P continues all the behaviors of PRE_COPY above .
* However , while in the PRE_COPY_P2P state , the device is partially running
* in the P2P quiescent state defined below , like RUNNING_P2P .
*
* PRE_COPY_P2P - > PRE_COPY
* This arc allows returning the device to a full RUNNING behavior while
* continuing all the behaviors of PRE_COPY .
*
* PRE_COPY_P2P - > STOP_COPY
* While in the STOP_COPY state the device has the same behavior as STOP
* with the addition that the data transfers session continues to stream the
* migration state . End of stream on the FD indicates the entire device
* state has been transferred .
*
* The user should take steps to restrict access to vfio device regions while
* the device is in STOP_COPY or risk corruption of the device migration data
* stream .
*
* STOP - > RESUMING
* Entering the RESUMING state starts a process of restoring the device state
* and will return a new data_fd . The data stream fed into the data_fd should
* be taken from the data transfer output of a single FD during saving from
* a compatible device . The migration driver may alter / reset the internal
* device state for this arc if required to prepare the device to receive the
* migration data .
*
* STOP_COPY - > PRE_COPY
* STOP_COPY - > PRE_COPY_P2P
* These arcs are not permitted and return error if requested . Future
* revisions of this API may define behaviors for these arcs , in this case
* support will be discoverable by a new flag in
* VFIO_DEVICE_FEATURE_MIGRATION .
*
* any - > ERROR
* ERROR cannot be specified as a device state , however any transition request
* can be failed with an errno return and may then move the device_state into
* ERROR . In this case the device was unable to execute the requested arc and
* was also unable to restore the device to any valid device_state .
* To recover from ERROR VFIO_DEVICE_RESET must be used to return the
* device_state back to RUNNING .
*
* The optional peer to peer ( P2P ) quiescent state is intended to be a quiescent
* state for the device for the purposes of managing multiple devices within a
* user context where peer - to - peer DMA between devices may be active . The
* RUNNING_P2P and PRE_COPY_P2P states must prevent the device from initiating
* any new P2P DMA transactions . If the device can identify P2P transactions
* then it can stop only P2P DMA , otherwise it must stop all DMA . The migration
* driver must complete any such outstanding operations prior to completing the
* FSM arc into a P2P state . For the purpose of specification the states
* behave as though the device was fully running if not supported . Like while in
* STOP or STOP_COPY the user must not touch the device , otherwise the state
* can be exited .
*
* The remaining possible transitions are interpreted as combinations of the
* above FSM arcs . As there are multiple paths through the FSM arcs the path
* should be selected based on the following rules :
* - Select the shortest path .
* - The path cannot have saving group states as interior arcs , only
* starting / end states .
* Refer to vfio_mig_get_next_state ( ) for the result of the algorithm .
*
* The automatic transit through the FSM arcs that make up the combination
* transition is invisible to the user . When working with combination arcs the
* user may see any step along the path in the device_state if SET_STATE
* fails . When handling these types of errors users should anticipate future
* revisions of this protocol using new states and those states becoming
* visible in this case .
*
* The optional states cannot be used with SET_STATE if the device does not
* support them . The user can discover if these states are supported by using
* VFIO_DEVICE_FEATURE_MIGRATION . By using combination transitions the user can
* avoid knowing about these optional states if the kernel driver supports them .
*
* Arcs touching PRE_COPY and PRE_COPY_P2P are removed if support for PRE_COPY
* is not present .
*/
enum vfio_device_mig_state {
VFIO_DEVICE_STATE_ERROR = 0 ,
VFIO_DEVICE_STATE_STOP = 1 ,
VFIO_DEVICE_STATE_RUNNING = 2 ,
VFIO_DEVICE_STATE_STOP_COPY = 3 ,
VFIO_DEVICE_STATE_RESUMING = 4 ,
VFIO_DEVICE_STATE_RUNNING_P2P = 5 ,
VFIO_DEVICE_STATE_PRE_COPY = 6 ,
VFIO_DEVICE_STATE_PRE_COPY_P2P = 7 ,
VFIO_DEVICE_STATE_NR,
};
/**
* VFIO_MIG_GET_PRECOPY_INFO - _ IO ( VFIO_TYPE , VFIO_BASE + 21 )
*
* This ioctl is used on the migration data FD in the precopy phase of the
* migration data transfer . It returns an estimate of the current data sizes
* remaining to be transferred . It allows the user to judge when it is
* appropriate to leave PRE_COPY for STOP_COPY .
*
* This ioctl is valid only in PRE_COPY states and kernel driver should
* return - EINVAL from any other migration state .
*
* The vfio_precopy_info data structure returned by this ioctl provides
* estimates of data available from the device during the PRE_COPY states .
* This estimate is split into two categories , initial_bytes and
* dirty_bytes .
*
* The initial_bytes field indicates the amount of initial precopy
* data available from the device . This field should have a non - zero initial
* value and decrease as migration data is read from the device .
* It is recommended to leave PRE_COPY for STOP_COPY only after this field
* reaches zero . Leaving PRE_COPY earlier might make things slower .
*
* The dirty_bytes field tracks device state changes relative to data
* previously retrieved . This field starts at zero and may increase as
* the internal device state is modified or decrease as that modified
* state is read from the device .
*
* Userspace may use the combination of these fields to estimate the
* potential data size available during the PRE_COPY phases , as well as
* trends relative to the rate the device is dirtying its internal
* state , but these fields are not required to have any bearing relative
* to the data size available during the STOP_COPY phase .
*
* Drivers have a lot of flexibility in when and what they transfer during the
* PRE_COPY phase , and how they report this from VFIO_MIG_GET_PRECOPY_INFO .
*
* During pre - copy the migration data FD has a temporary " end of stream " that is
* reached when both initial_bytes and dirty_byte are zero . For instance , this
* may indicate that the device is idle and not currently dirtying any internal
* state . When read ( ) is done on this temporary end of stream the kernel driver
* should return ENOMSG from read ( ) . Userspace can wait for more data ( which may
* never come ) by using poll .
*
* Once in STOP_COPY the migration data FD has a permanent end of stream
* signaled in the usual way by read ( ) always returning 0 and poll always
* returning readable . ENOMSG may not be returned in STOP_COPY .
* Support for this ioctl is mandatory if a driver claims to support
* VFIO_MIGRATION_PRE_COPY .
*
* Return : 0 on success , - 1 and errno set on failure .
*/
struct vfio_precopy_info {
__u32 argsz;
__u32 flags;
__aligned_u64 initial_bytes;
__aligned_u64 dirty_bytes;
};
#define VFIO_MIG_GET_PRECOPY_INFO _IO(VFIO_TYPE, VFIO_BASE + 21 )
/*
* Upon VFIO_DEVICE_FEATURE_SET , allow the device to be moved into a low power
* state with the platform - based power management . Device use of lower power
* states depends on factors managed by the runtime power management core ,
* including system level support and coordinating support among dependent
* devices . Enabling device low power entry does not guarantee lower power
* usage by the device , nor is a mechanism provided through this feature to
* know the current power state of the device . If any device access happens
* ( either from the host or through the vfio uAPI ) when the device is in the
* low power state , then the host will move the device out of the low power
* state as necessary prior to the access . Once the access is completed , the
* device may re - enter the low power state . For single shot low power support
* with wake - up notification , see
* VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP below . Access to mmap ' d
* device regions is disabled on LOW_POWER_ENTRY and may only be resumed after
* calling LOW_POWER_EXIT .
*/
#define VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY 3
/*
* This device feature has the same behavior as
* VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY with the exception that the user
* provides an eventfd for wake - up notification . When the device moves out of
* the low power state for the wake - up , the host will not allow the device to
* re - enter a low power state without a subsequent user call to one of the low
* power entry device feature IOCTLs . Access to mmap ' d device regions is
* disabled on LOW_POWER_ENTRY_WITH_WAKEUP and may only be resumed after the
* low power exit . The low power exit can happen either through LOW_POWER_EXIT
* or through any other access ( where the wake - up notification has been
* generated ) . The access to mmap ' d device regions will not trigger low power
* exit .
*
* The notification through the provided eventfd will be generated only when
* the device has entered and is resumed from a low power state after
* calling this device feature IOCTL . A device that has not entered low power
* state , as managed through the runtime power management core , will not
* generate a notification through the provided eventfd on access . Calling the
* LOW_POWER_EXIT feature is optional in the case where notification has been
* signaled on the provided eventfd that a resume from low power has occurred .
*/
struct vfio_device_low_power_entry_with_wakeup {
__s32 wakeup_eventfd;
__u32 reserved;
};
#define VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP 4
/*
* Upon VFIO_DEVICE_FEATURE_SET , disallow use of device low power states as
* previously enabled via VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY or
* VFIO_DEVICE_FEATURE_LOW_POWER_ENTRY_WITH_WAKEUP device features .
* This device feature IOCTL may itself generate a wakeup eventfd notification
* in the latter case if the device had previously entered a low power state .
*/
#define VFIO_DEVICE_FEATURE_LOW_POWER_EXIT 5
/*
* Upon VFIO_DEVICE_FEATURE_SET start / stop device DMA logging .
* VFIO_DEVICE_FEATURE_PROBE can be used to detect if the device supports
* DMA logging .
*
* DMA logging allows a device to internally record what DMAs the device is
* initiating and report them back to userspace . It is part of the VFIO
* migration infrastructure that allows implementing dirty page tracking
* during the pre copy phase of live migration . Only DMA WRITEs are logged ,
* and this API is not connected to VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE .
*
* When DMA logging is started a range of IOVAs to monitor is provided and the
* device can optimize its logging to cover only the IOVA range given . Each
* DMA that the device initiates inside the range will be logged by the device
* for later retrieval .
*
* page_size is an input that hints what tracking granularity the device
* should try to achieve . If the device cannot do the hinted page size then
* it ' s the driver choice which page size to pick based on its support .
* On output the device will return the page size it selected .
*
* ranges is a pointer to an array of
* struct vfio_device_feature_dma_logging_range .
*
* The core kernel code guarantees to support by minimum num_ranges that fit
* into a single kernel page . User space can try higher values but should give
* up if the above can ' t be achieved as of some driver limitations .
*
* A single call to start device DMA logging can be issued and a matching stop
* should follow at the end . Another start is not allowed in the meantime .
*/
struct vfio_device_feature_dma_logging_control {
__aligned_u64 page_size;
__u32 num_ranges;
__u32 __reserved;
__aligned_u64 ranges;
};
struct vfio_device_feature_dma_logging_range {
__aligned_u64 iova;
__aligned_u64 length;
};
#define VFIO_DEVICE_FEATURE_DMA_LOGGING_START 6
/*
* Upon VFIO_DEVICE_FEATURE_SET stop device DMA logging that was started
* by VFIO_DEVICE_FEATURE_DMA_LOGGING_START
*/
#define VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP 7
/*
* Upon VFIO_DEVICE_FEATURE_GET read back and clear the device DMA log
*
* Query the device ' s DMA log for written pages within the given IOVA range .
* During querying the log is cleared for the IOVA range .
*
* bitmap is a pointer to an array of u64s that will hold the output bitmap
* with 1 bit reporting a page_size unit of IOVA . The mapping of IOVA to bits
* is given by :
* bitmap [ ( addr - iova ) / page_size ] & ( 1 ULL < < ( addr % 64 ) )
*
* The input page_size can be any power of two value and does not have to
* match the value given to VFIO_DEVICE_FEATURE_DMA_LOGGING_START . The driver
* will format its internal logging to match the reporting page size , possibly
* by replicating bits if the internal page size is lower than requested .
*
* The LOGGING_REPORT will only set bits in the bitmap and never clear or
* perform any initialization of the user provided bitmap .
*
* If any error is returned userspace should assume that the dirty log is
* corrupted . Error recovery is to consider all memory dirty and try to
* restart the dirty tracking , or to abort / restart the whole migration .
*
* If DMA logging is not enabled , an error will be returned .
*
*/
struct vfio_device_feature_dma_logging_report {
__aligned_u64 iova;
__aligned_u64 length;
__aligned_u64 page_size;
__aligned_u64 bitmap;
};
#define VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT 8
/*
* Upon VFIO_DEVICE_FEATURE_GET read back the estimated data length that will
* be required to complete stop copy .
*
* Note : Can be called on each device state .
*/
struct vfio_device_feature_mig_data_size {
__aligned_u64 stop_copy_length;
};
#define VFIO_DEVICE_FEATURE_MIG_DATA_SIZE 9
/**
* Upon VFIO_DEVICE_FEATURE_SET , set or clear the BUS mastering for the device
* based on the operation specified in op flag .
*
* The functionality is incorporated for devices that needs bus master control ,
* but the in - band device interface lacks the support . Consequently , it is not
* applicable to PCI devices , as bus master control for PCI devices is managed
* in - band through the configuration space . At present , this feature is supported
* only for CDX devices .
* When the device ' s BUS MASTER setting is configured as CLEAR , it will result in
* blocking all incoming DMA requests from the device . On the other hand , configuring
* the device ' s BUS MASTER setting as SET ( enable ) will grant the device the
* capability to perform DMA to the host memory .
*/
struct vfio_device_feature_bus_master {
__u32 op;
#define VFIO_DEVICE_FEATURE_CLEAR_MASTER 0 /* Clear Bus Master */
#define VFIO_DEVICE_FEATURE_SET_MASTER 1 /* Set Bus Master */
};
#define VFIO_DEVICE_FEATURE_BUS_MASTER 10
/* -------- 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 */
#define VFIO_IOMMU_INFO_CAPS (1 << 1 ) /* Info supports caps */
__aligned_u64 iova_pgsizes; /* Bitmap of supported page sizes */
__u32 cap_offset; /* Offset within info struct of first cap */
__u32 pad;
};
/*
* The IOVA capability allows to report the valid IOVA range ( s )
* excluding any non - relaxable reserved regions exposed by
* devices attached to the container . Any DMA map attempt
* outside the valid iova range will return error .
*
* The structures below define version 1 of this capability .
*/
#define VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE 1
struct vfio_iova_range {
__u64 start;
__u64 end;
};
struct vfio_iommu_type1_info_cap_iova_range {
struct vfio_info_cap_header header;
__u32 nr_iovas;
__u32 reserved;
struct vfio_iova_range iova_ranges[];
};
/*
* The migration capability allows to report supported features for migration .
*
* The structures below define version 1 of this capability .
*
* The existence of this capability indicates that IOMMU kernel driver supports
* dirty page logging .
*
* pgsize_bitmap : Kernel driver returns bitmap of supported page sizes for dirty
* page logging .
* max_dirty_bitmap_size : Kernel driver returns maximum supported dirty bitmap
* size in bytes that can be used by user applications when getting the dirty
* bitmap .
*/
#define VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION 2
struct vfio_iommu_type1_info_cap_migration {
struct vfio_info_cap_header header;
__u32 flags;
__u64 pgsize_bitmap;
__u64 max_dirty_bitmap_size; /* in bytes */
};
/*
* The DMA available capability allows to report the current number of
* simultaneously outstanding DMA mappings that are allowed .
*
* The structure below defines version 1 of this capability .
*
* avail : specifies the current number of outstanding DMA mappings allowed .
*/
#define VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL 3
struct vfio_iommu_type1_info_dma_avail {
struct vfio_info_cap_header header;
__u32 avail;
};
#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 .
*
* If flags & VFIO_DMA_MAP_FLAG_VADDR , update the base vaddr for iova . The vaddr
* must have previously been invalidated with VFIO_DMA_UNMAP_FLAG_VADDR . To
* maintain memory consistency within the user application , the updated vaddr
* must address the same memory object as originally mapped . Failure to do so
* will result in user memory corruption and / or device misbehavior . iova and
* size must match those in the original MAP_DMA call . Protection is not
* changed , and the READ & WRITE flags must be 0 .
*/
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 */
#define VFIO_DMA_MAP_FLAG_VADDR (1 << 2 )
__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 )
struct vfio_bitmap {
__u64 pgsize; /* page size for bitmap in bytes */
__u64 size; /* in bytes */
__u64 __user *data; /* one bit per page */
};
/**
* VFIO_IOMMU_UNMAP_DMA - _ IOWR ( VFIO_TYPE , VFIO_BASE + 14 ,
* struct vfio_dma_unmap )
*
* Unmap IO virtual addresses using the provided struct vfio_dma_unmap .
* Caller sets argsz . The actual unmapped size is returned in the size
* field . No guarantee is made to the user that arbitrary unmaps of iova
* or size different from those used in the original mapping call will
* succeed .
*
* VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP should be set to get the dirty bitmap
* before unmapping IO virtual addresses . When this flag is set , the user must
* provide a struct vfio_bitmap in data [ ] . User must provide zero - allocated
* memory via vfio_bitmap . data and its size in the vfio_bitmap . size field .
* A bit in the bitmap represents one page , of user provided page size in
* vfio_bitmap . pgsize field , consecutively starting from iova offset . Bit set
* indicates that the page at that offset from iova is dirty . A Bitmap of the
* pages in the range of unmapped size is returned in the user - provided
* vfio_bitmap . data .
*
* If flags & VFIO_DMA_UNMAP_FLAG_ALL , unmap all addresses . iova and size
* must be 0 . This cannot be combined with the get - dirty - bitmap flag .
*
* If flags & VFIO_DMA_UNMAP_FLAG_VADDR , do not unmap , but invalidate host
* virtual addresses in the iova range . DMA to already - mapped pages continues .
* Groups may not be added to the container while any addresses are invalid .
* This cannot be combined with the get - dirty - bitmap flag .
*/
struct vfio_iommu_type1_dma_unmap {
__u32 argsz;
__u32 flags;
#define VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP (1 << 0 )
#define VFIO_DMA_UNMAP_FLAG_ALL (1 << 1 )
#define VFIO_DMA_UNMAP_FLAG_VADDR (1 << 2 )
__u64 iova; /* IO virtual address */
__u64 size; /* Size of mapping (bytes) */
__u8 data[];
};
#define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14 )
/*
* IOCTLs to enable / disable IOMMU container usage .
* No parameters are supported .
*/
#define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15 )
#define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16 )
/**
* VFIO_IOMMU_DIRTY_PAGES - _ IOWR ( VFIO_TYPE , VFIO_BASE + 17 ,
* struct vfio_iommu_type1_dirty_bitmap )
* IOCTL is used for dirty pages logging .
* Caller should set flag depending on which operation to perform , details as
* below :
*
* Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_START flag set , instructs
* the IOMMU driver to log pages that are dirtied or potentially dirtied by
* the device ; designed to be used when a migration is in progress . Dirty pages
* are logged until logging is disabled by user application by calling the IOCTL
* with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag .
*
* Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP flag set , instructs
* the IOMMU driver to stop logging dirtied pages .
*
* Calling the IOCTL with VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP flag set
* returns the dirty pages bitmap for IOMMU container for a given IOVA range .
* The user must specify the IOVA range and the pgsize through the structure
* vfio_iommu_type1_dirty_bitmap_get in the data [ ] portion . This interface
* supports getting a bitmap of the smallest supported pgsize only and can be
* modified in future to get a bitmap of any specified supported pgsize . The
* user must provide a zeroed memory area for the bitmap memory and specify its
* size in bitmap . size . One bit is used to represent one page consecutively
* starting from iova offset . The user should provide page size in bitmap . pgsize
* field . A bit set in the bitmap indicates that the page at that offset from
* iova is dirty . The caller must set argsz to a value including the size of
* structure vfio_iommu_type1_dirty_bitmap_get , but excluding the size of the
* actual bitmap . If dirty pages logging is not enabled , an error will be
* returned .
*
* Only one of the flags _ START , _ STOP and _ GET may be specified at a time .
*
*/
struct vfio_iommu_type1_dirty_bitmap {
__u32 argsz;
__u32 flags;
#define VFIO_IOMMU_DIRTY_PAGES_FLAG_START (1 << 0 )
#define VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP (1 << 1 )
#define VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP (1 << 2 )
__u8 data[];
};
struct vfio_iommu_type1_dirty_bitmap_get {
__u64 iova; /* IO virtual address */
__u64 size; /* Size of iova range */
struct vfio_bitmap bitmap;
};
#define VFIO_IOMMU_DIRTY_PAGES _IO(VFIO_TYPE, VFIO_BASE + 17 )
/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
/*
* The SPAPR TCE DDW info struct provides the information about
* the details of Dynamic DMA window capability .
*
* @ pgsizes contains a page size bitmask , 4 K / 64 K / 16 M are supported .
* @ max_dynamic_windows_supported tells the maximum number of windows
* which the platform can create .
* @ levels tells the maximum number of levels in multi - level IOMMU tables ;
* this allows splitting a table into smaller chunks which reduces
* the amount of physically contiguous memory required for the table .
*/
struct vfio_iommu_spapr_tce_ddw_info {
__u64 pgsizes; /* Bitmap of supported page sizes */
__u32 max_dynamic_windows_supported;
__u32 levels;
};
/*
* The SPAPR TCE info struct provides the information about the PCI bus
* address ranges available for DMA , these values are programmed into
* the hardware so the guest has to know that information .
*
* The DMA 32 bit window start is an absolute PCI bus address .
* The IOVA address passed via map / unmap ioctls are absolute PCI bus
* addresses too so the window works as a filter rather than an offset
* for IOVA addresses .
*
* Flags supported :
* - VFIO_IOMMU_SPAPR_INFO_DDW : informs the userspace that dynamic DMA windows
* ( DDW ) support is present . @ ddw is only supported when DDW is present .
*/
struct vfio_iommu_spapr_tce_info {
__u32 argsz;
__u32 flags;
#define VFIO_IOMMU_SPAPR_INFO_DDW (1 << 0 ) /* DDW supported */
__u32 dma32_window_start; /* 32 bit window start (bytes) */
__u32 dma32_window_size; /* 32 bit window size (bytes) */
struct vfio_iommu_spapr_tce_ddw_info ddw;
};
#define VFIO_IOMMU_SPAPR_TCE_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12 )
/*
* EEH PE operation struct provides ways to :
* - enable / disable EEH functionality ;
* - unfreeze IO / DMA for frozen PE ;
* - read PE state ;
* - reset PE ;
* - configure PE ;
* - inject EEH error .
*/
struct vfio_eeh_pe_err {
__u32 type;
__u32 func;
__u64 addr;
__u64 mask;
};
struct vfio_eeh_pe_op {
__u32 argsz;
__u32 flags;
__u32 op;
union {
struct vfio_eeh_pe_err err;
};
};
#define VFIO_EEH_PE_DISABLE 0 /* Disable EEH functionality */
#define VFIO_EEH_PE_ENABLE 1 /* Enable EEH functionality */
#define VFIO_EEH_PE_UNFREEZE_IO 2 /* Enable IO for frozen PE */
#define VFIO_EEH_PE_UNFREEZE_DMA 3 /* Enable DMA for frozen PE */
#define VFIO_EEH_PE_GET_STATE 4 /* PE state retrieval */
#define VFIO_EEH_PE_STATE_NORMAL 0 /* PE in functional state */
#define VFIO_EEH_PE_STATE_RESET 1 /* PE reset in progress */
#define VFIO_EEH_PE_STATE_STOPPED 2 /* Stopped DMA and IO */
#define VFIO_EEH_PE_STATE_STOPPED_DMA 4 /* Stopped DMA only */
#define VFIO_EEH_PE_STATE_UNAVAIL 5 /* State unavailable */
#define VFIO_EEH_PE_RESET_DEACTIVATE 5 /* Deassert PE reset */
#define VFIO_EEH_PE_RESET_HOT 6 /* Assert hot reset */
#define VFIO_EEH_PE_RESET_FUNDAMENTAL 7 /* Assert fundamental reset */
#define VFIO_EEH_PE_CONFIGURE 8 /* PE configuration */
#define VFIO_EEH_PE_INJECT_ERR 9 /* Inject EEH error */
#define VFIO_EEH_PE_OP _IO(VFIO_TYPE, VFIO_BASE + 21 )
/**
* VFIO_IOMMU_SPAPR_REGISTER_MEMORY - _ IOW ( VFIO_TYPE , VFIO_BASE + 17 , struct vfio_iommu_spapr_register_memory )
*
* Registers user space memory where DMA is allowed . It pins
* user pages and does the locked memory accounting so
* subsequent VFIO_IOMMU_MAP_DMA / VFIO_IOMMU_UNMAP_DMA calls
* get faster .
*/
struct vfio_iommu_spapr_register_memory {
__u32 argsz;
__u32 flags;
__u64 vaddr; /* Process virtual address */
__u64 size; /* Size of mapping (bytes) */
};
#define VFIO_IOMMU_SPAPR_REGISTER_MEMORY _IO(VFIO_TYPE, VFIO_BASE + 17 )
/**
* VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY - _ IOW ( VFIO_TYPE , VFIO_BASE + 18 , struct vfio_iommu_spapr_register_memory )
*
* Unregisters user space memory registered with
* VFIO_IOMMU_SPAPR_REGISTER_MEMORY .
* Uses vfio_iommu_spapr_register_memory for parameters .
*/
#define VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY _IO(VFIO_TYPE, VFIO_BASE + 18 )
/**
* VFIO_IOMMU_SPAPR_TCE_CREATE - _ IOWR ( VFIO_TYPE , VFIO_BASE + 19 , struct vfio_iommu_spapr_tce_create )
*
* Creates an additional TCE table and programs it ( sets a new DMA window )
* to every IOMMU group in the container . It receives page shift , window
* size and number of levels in the TCE table being created .
*
* It allocates and returns an offset on a PCI bus of the new DMA window .
*/
struct vfio_iommu_spapr_tce_create {
__u32 argsz;
__u32 flags;
/* in */
__u32 page_shift;
__u32 __resv1;
__u64 window_size;
__u32 levels;
__u32 __resv2;
/* out */
__u64 start_addr;
};
#define VFIO_IOMMU_SPAPR_TCE_CREATE _IO(VFIO_TYPE, VFIO_BASE + 19 )
/**
* VFIO_IOMMU_SPAPR_TCE_REMOVE - _ IOW ( VFIO_TYPE , VFIO_BASE + 20 , struct vfio_iommu_spapr_tce_remove )
*
* Unprograms a TCE table from all groups in the container and destroys it .
* It receives a PCI bus offset as a window id .
*/
struct vfio_iommu_spapr_tce_remove {
__u32 argsz;
__u32 flags;
/* in */
__u64 start_addr;
};
#define VFIO_IOMMU_SPAPR_TCE_REMOVE _IO(VFIO_TYPE, VFIO_BASE + 20 )
/* ***************************************************************** */
#endif /* _UAPIVFIO_H */
Messung V0.5 in Prozent C=90 H=100 G=95
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