/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES. */ #ifndef _UAPI_IOMMUFD_H #define _UAPI_IOMMUFD_H #include <linux/ioctl.h> #include <linux/types.h> #define IOMMUFD_TYPE … /** * DOC: General ioctl format * * The ioctl interface follows a general format to allow for extensibility. Each * ioctl is passed in a structure pointer as the argument providing the size of * the structure in the first u32. The kernel checks that any structure space * beyond what it understands is 0. This allows userspace to use the backward * compatible portion while consistently using the newer, larger, structures. * * ioctls use a standard meaning for common errnos: * * - ENOTTY: The IOCTL number itself is not supported at all * - E2BIG: The IOCTL number is supported, but the provided structure has * non-zero in a part the kernel does not understand. * - EOPNOTSUPP: The IOCTL number is supported, and the structure is * understood, however a known field has a value the kernel does not * understand or support. * - EINVAL: Everything about the IOCTL was understood, but a field is not * correct. * - ENOENT: An ID or IOVA provided does not exist. * - ENOMEM: Out of memory. * - EOVERFLOW: Mathematics overflowed. * * As well as additional errnos, within specific ioctls. */ enum { … }; /** * struct iommu_destroy - ioctl(IOMMU_DESTROY) * @size: sizeof(struct iommu_destroy) * @id: iommufd object ID to destroy. Can be any destroyable object type. * * Destroy any object held within iommufd. */ struct iommu_destroy { … }; #define IOMMU_DESTROY … /** * struct iommu_ioas_alloc - ioctl(IOMMU_IOAS_ALLOC) * @size: sizeof(struct iommu_ioas_alloc) * @flags: Must be 0 * @out_ioas_id: Output IOAS ID for the allocated object * * Allocate an IO Address Space (IOAS) which holds an IO Virtual Address (IOVA) * to memory mapping. */ struct iommu_ioas_alloc { … }; #define IOMMU_IOAS_ALLOC … /** * struct iommu_iova_range - ioctl(IOMMU_IOVA_RANGE) * @start: First IOVA * @last: Inclusive last IOVA * * An interval in IOVA space. */ struct iommu_iova_range { … }; /** * struct iommu_ioas_iova_ranges - ioctl(IOMMU_IOAS_IOVA_RANGES) * @size: sizeof(struct iommu_ioas_iova_ranges) * @ioas_id: IOAS ID to read ranges from * @num_iovas: Input/Output total number of ranges in the IOAS * @__reserved: Must be 0 * @allowed_iovas: Pointer to the output array of struct iommu_iova_range * @out_iova_alignment: Minimum alignment required for mapping IOVA * * Query an IOAS for ranges of allowed IOVAs. Mapping IOVA outside these ranges * is not allowed. num_iovas will be set to the total number of iovas and * the allowed_iovas[] will be filled in as space permits. * * The allowed ranges are dependent on the HW path the DMA operation takes, and * can change during the lifetime of the IOAS. A fresh empty IOAS will have a * full range, and each attached device will narrow the ranges based on that * device's HW restrictions. Detaching a device can widen the ranges. Userspace * should query ranges after every attach/detach to know what IOVAs are valid * for mapping. * * On input num_iovas is the length of the allowed_iovas array. On output it is * the total number of iovas filled in. The ioctl will return -EMSGSIZE and set * num_iovas to the required value if num_iovas is too small. In this case the * caller should allocate a larger output array and re-issue the ioctl. * * out_iova_alignment returns the minimum IOVA alignment that can be given * to IOMMU_IOAS_MAP/COPY. IOVA's must satisfy:: * * starting_iova % out_iova_alignment == 0 * (starting_iova + length) % out_iova_alignment == 0 * * out_iova_alignment can be 1 indicating any IOVA is allowed. It cannot * be higher than the system PAGE_SIZE. */ struct iommu_ioas_iova_ranges { … }; #define IOMMU_IOAS_IOVA_RANGES … /** * struct iommu_ioas_allow_iovas - ioctl(IOMMU_IOAS_ALLOW_IOVAS) * @size: sizeof(struct iommu_ioas_allow_iovas) * @ioas_id: IOAS ID to allow IOVAs from * @num_iovas: Input/Output total number of ranges in the IOAS * @__reserved: Must be 0 * @allowed_iovas: Pointer to array of struct iommu_iova_range * * Ensure a range of IOVAs are always available for allocation. If this call * succeeds then IOMMU_IOAS_IOVA_RANGES will never return a list of IOVA ranges * that are narrower than the ranges provided here. This call will fail if * IOMMU_IOAS_IOVA_RANGES is currently narrower than the given ranges. * * When an IOAS is first created the IOVA_RANGES will be maximally sized, and as * devices are attached the IOVA will narrow based on the device restrictions. * When an allowed range is specified any narrowing will be refused, ie device * attachment can fail if the device requires limiting within the allowed range. * * Automatic IOVA allocation is also impacted by this call. MAP will only * allocate within the allowed IOVAs if they are present. * * This call replaces the entire allowed list with the given list. */ struct iommu_ioas_allow_iovas { … }; #define IOMMU_IOAS_ALLOW_IOVAS … /** * enum iommufd_ioas_map_flags - Flags for map and copy * @IOMMU_IOAS_MAP_FIXED_IOVA: If clear the kernel will compute an appropriate * IOVA to place the mapping at * @IOMMU_IOAS_MAP_WRITEABLE: DMA is allowed to write to this mapping * @IOMMU_IOAS_MAP_READABLE: DMA is allowed to read from this mapping */ enum iommufd_ioas_map_flags { … }; /** * struct iommu_ioas_map - ioctl(IOMMU_IOAS_MAP) * @size: sizeof(struct iommu_ioas_map) * @flags: Combination of enum iommufd_ioas_map_flags * @ioas_id: IOAS ID to change the mapping of * @__reserved: Must be 0 * @user_va: Userspace pointer to start mapping from * @length: Number of bytes to map * @iova: IOVA the mapping was placed at. If IOMMU_IOAS_MAP_FIXED_IOVA is set * then this must be provided as input. * * Set an IOVA mapping from a user pointer. If FIXED_IOVA is specified then the * mapping will be established at iova, otherwise a suitable location based on * the reserved and allowed lists will be automatically selected and returned in * iova. * * If IOMMU_IOAS_MAP_FIXED_IOVA is specified then the iova range must currently * be unused, existing IOVA cannot be replaced. */ struct iommu_ioas_map { … }; #define IOMMU_IOAS_MAP … /** * struct iommu_ioas_copy - ioctl(IOMMU_IOAS_COPY) * @size: sizeof(struct iommu_ioas_copy) * @flags: Combination of enum iommufd_ioas_map_flags * @dst_ioas_id: IOAS ID to change the mapping of * @src_ioas_id: IOAS ID to copy from * @length: Number of bytes to copy and map * @dst_iova: IOVA the mapping was placed at. If IOMMU_IOAS_MAP_FIXED_IOVA is * set then this must be provided as input. * @src_iova: IOVA to start the copy * * Copy an already existing mapping from src_ioas_id and establish it in * dst_ioas_id. The src iova/length must exactly match a range used with * IOMMU_IOAS_MAP. * * This may be used to efficiently clone a subset of an IOAS to another, or as a * kind of 'cache' to speed up mapping. Copy has an efficiency advantage over * establishing equivalent new mappings, as internal resources are shared, and * the kernel will pin the user memory only once. */ struct iommu_ioas_copy { … }; #define IOMMU_IOAS_COPY … /** * struct iommu_ioas_unmap - ioctl(IOMMU_IOAS_UNMAP) * @size: sizeof(struct iommu_ioas_unmap) * @ioas_id: IOAS ID to change the mapping of * @iova: IOVA to start the unmapping at * @length: Number of bytes to unmap, and return back the bytes unmapped * * Unmap an IOVA range. The iova/length must be a superset of a previously * mapped range used with IOMMU_IOAS_MAP or IOMMU_IOAS_COPY. Splitting or * truncating ranges is not allowed. The values 0 to U64_MAX will unmap * everything. */ struct iommu_ioas_unmap { … }; #define IOMMU_IOAS_UNMAP … /** * enum iommufd_option - ioctl(IOMMU_OPTION_RLIMIT_MODE) and * ioctl(IOMMU_OPTION_HUGE_PAGES) * @IOMMU_OPTION_RLIMIT_MODE: * Change how RLIMIT_MEMLOCK accounting works. The caller must have privilege * to invoke this. Value 0 (default) is user based accouting, 1 uses process * based accounting. Global option, object_id must be 0 * @IOMMU_OPTION_HUGE_PAGES: * Value 1 (default) allows contiguous pages to be combined when generating * iommu mappings. Value 0 disables combining, everything is mapped to * PAGE_SIZE. This can be useful for benchmarking. This is a per-IOAS * option, the object_id must be the IOAS ID. */ enum iommufd_option { … }; /** * enum iommufd_option_ops - ioctl(IOMMU_OPTION_OP_SET) and * ioctl(IOMMU_OPTION_OP_GET) * @IOMMU_OPTION_OP_SET: Set the option's value * @IOMMU_OPTION_OP_GET: Get the option's value */ enum iommufd_option_ops { … }; /** * struct iommu_option - iommu option multiplexer * @size: sizeof(struct iommu_option) * @option_id: One of enum iommufd_option * @op: One of enum iommufd_option_ops * @__reserved: Must be 0 * @object_id: ID of the object if required * @val64: Option value to set or value returned on get * * Change a simple option value. This multiplexor allows controlling options * on objects. IOMMU_OPTION_OP_SET will load an option and IOMMU_OPTION_OP_GET * will return the current value. */ struct iommu_option { … }; #define IOMMU_OPTION … /** * enum iommufd_vfio_ioas_op - IOMMU_VFIO_IOAS_* ioctls * @IOMMU_VFIO_IOAS_GET: Get the current compatibility IOAS * @IOMMU_VFIO_IOAS_SET: Change the current compatibility IOAS * @IOMMU_VFIO_IOAS_CLEAR: Disable VFIO compatibility */ enum iommufd_vfio_ioas_op { … }; /** * struct iommu_vfio_ioas - ioctl(IOMMU_VFIO_IOAS) * @size: sizeof(struct iommu_vfio_ioas) * @ioas_id: For IOMMU_VFIO_IOAS_SET the input IOAS ID to set * For IOMMU_VFIO_IOAS_GET will output the IOAS ID * @op: One of enum iommufd_vfio_ioas_op * @__reserved: Must be 0 * * The VFIO compatibility support uses a single ioas because VFIO APIs do not * support the ID field. Set or Get the IOAS that VFIO compatibility will use. * When VFIO_GROUP_SET_CONTAINER is used on an iommufd it will get the * compatibility ioas, either by taking what is already set, or auto creating * one. From then on VFIO will continue to use that ioas and is not effected by * this ioctl. SET or CLEAR does not destroy any auto-created IOAS. */ struct iommu_vfio_ioas { … }; #define IOMMU_VFIO_IOAS … /** * enum iommufd_hwpt_alloc_flags - Flags for HWPT allocation * @IOMMU_HWPT_ALLOC_NEST_PARENT: If set, allocate a HWPT that can serve as * the parent HWPT in a nesting configuration. * @IOMMU_HWPT_ALLOC_DIRTY_TRACKING: Dirty tracking support for device IOMMU is * enforced on device attachment * @IOMMU_HWPT_FAULT_ID_VALID: The fault_id field of hwpt allocation data is * valid. */ enum iommufd_hwpt_alloc_flags { … }; /** * enum iommu_hwpt_vtd_s1_flags - Intel VT-d stage-1 page table * entry attributes * @IOMMU_VTD_S1_SRE: Supervisor request * @IOMMU_VTD_S1_EAFE: Extended access enable * @IOMMU_VTD_S1_WPE: Write protect enable */ enum iommu_hwpt_vtd_s1_flags { … }; /** * struct iommu_hwpt_vtd_s1 - Intel VT-d stage-1 page table * info (IOMMU_HWPT_DATA_VTD_S1) * @flags: Combination of enum iommu_hwpt_vtd_s1_flags * @pgtbl_addr: The base address of the stage-1 page table. * @addr_width: The address width of the stage-1 page table * @__reserved: Must be 0 */ struct iommu_hwpt_vtd_s1 { … }; /** * enum iommu_hwpt_data_type - IOMMU HWPT Data Type * @IOMMU_HWPT_DATA_NONE: no data * @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table */ enum iommu_hwpt_data_type { … }; /** * struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC) * @size: sizeof(struct iommu_hwpt_alloc) * @flags: Combination of enum iommufd_hwpt_alloc_flags * @dev_id: The device to allocate this HWPT for * @pt_id: The IOAS or HWPT to connect this HWPT to * @out_hwpt_id: The ID of the new HWPT * @__reserved: Must be 0 * @data_type: One of enum iommu_hwpt_data_type * @data_len: Length of the type specific data * @data_uptr: User pointer to the type specific data * @fault_id: The ID of IOMMUFD_FAULT object. Valid only if flags field of * IOMMU_HWPT_FAULT_ID_VALID is set. * @__reserved2: Padding to 64-bit alignment. Must be 0. * * Explicitly allocate a hardware page table object. This is the same object * type that is returned by iommufd_device_attach() and represents the * underlying iommu driver's iommu_domain kernel object. * * A kernel-managed HWPT will be created with the mappings from the given * IOAS via the @pt_id. The @data_type for this allocation must be set to * IOMMU_HWPT_DATA_NONE. The HWPT can be allocated as a parent HWPT for a * nesting configuration by passing IOMMU_HWPT_ALLOC_NEST_PARENT via @flags. * * A user-managed nested HWPT will be created from a given parent HWPT via * @pt_id, in which the parent HWPT must be allocated previously via the * same ioctl from a given IOAS (@pt_id). In this case, the @data_type * must be set to a pre-defined type corresponding to an I/O page table * type supported by the underlying IOMMU hardware. * * If the @data_type is set to IOMMU_HWPT_DATA_NONE, @data_len and * @data_uptr should be zero. Otherwise, both @data_len and @data_uptr * must be given. */ struct iommu_hwpt_alloc { … }; #define IOMMU_HWPT_ALLOC … /** * enum iommu_hw_info_vtd_flags - Flags for VT-d hw_info * @IOMMU_HW_INFO_VTD_ERRATA_772415_SPR17: If set, disallow read-only mappings * on a nested_parent domain. * https://www.intel.com/content/www/us/en/content-details/772415/content-details.html */ enum iommu_hw_info_vtd_flags { … }; /** * struct iommu_hw_info_vtd - Intel VT-d hardware information * * @flags: Combination of enum iommu_hw_info_vtd_flags * @__reserved: Must be 0 * * @cap_reg: Value of Intel VT-d capability register defined in VT-d spec * section 11.4.2 Capability Register. * @ecap_reg: Value of Intel VT-d capability register defined in VT-d spec * section 11.4.3 Extended Capability Register. * * User needs to understand the Intel VT-d specification to decode the * register value. */ struct iommu_hw_info_vtd { … }; /** * enum iommu_hw_info_type - IOMMU Hardware Info Types * @IOMMU_HW_INFO_TYPE_NONE: Used by the drivers that do not report hardware * info * @IOMMU_HW_INFO_TYPE_INTEL_VTD: Intel VT-d iommu info type */ enum iommu_hw_info_type { … }; /** * enum iommufd_hw_capabilities * @IOMMU_HW_CAP_DIRTY_TRACKING: IOMMU hardware support for dirty tracking * If available, it means the following APIs * are supported: * * IOMMU_HWPT_GET_DIRTY_BITMAP * IOMMU_HWPT_SET_DIRTY_TRACKING * */ enum iommufd_hw_capabilities { … }; /** * struct iommu_hw_info - ioctl(IOMMU_GET_HW_INFO) * @size: sizeof(struct iommu_hw_info) * @flags: Must be 0 * @dev_id: The device bound to the iommufd * @data_len: Input the length of a user buffer in bytes. Output the length of * data that kernel supports * @data_uptr: User pointer to a user-space buffer used by the kernel to fill * the iommu type specific hardware information data * @out_data_type: Output the iommu hardware info type as defined in the enum * iommu_hw_info_type. * @out_capabilities: Output the generic iommu capability info type as defined * in the enum iommu_hw_capabilities. * @__reserved: Must be 0 * * Query an iommu type specific hardware information data from an iommu behind * a given device that has been bound to iommufd. This hardware info data will * be used to sync capabilities between the virtual iommu and the physical * iommu, e.g. a nested translation setup needs to check the hardware info, so * a guest stage-1 page table can be compatible with the physical iommu. * * To capture an iommu type specific hardware information data, @data_uptr and * its length @data_len must be provided. Trailing bytes will be zeroed if the * user buffer is larger than the data that kernel has. Otherwise, kernel only * fills the buffer using the given length in @data_len. If the ioctl succeeds, * @data_len will be updated to the length that kernel actually supports, * @out_data_type will be filled to decode the data filled in the buffer * pointed by @data_uptr. Input @data_len == zero is allowed. */ struct iommu_hw_info { … }; #define IOMMU_GET_HW_INFO … /* * enum iommufd_hwpt_set_dirty_tracking_flags - Flags for steering dirty * tracking * @IOMMU_HWPT_DIRTY_TRACKING_ENABLE: Enable dirty tracking */ enum iommufd_hwpt_set_dirty_tracking_flags { … }; /** * struct iommu_hwpt_set_dirty_tracking - ioctl(IOMMU_HWPT_SET_DIRTY_TRACKING) * @size: sizeof(struct iommu_hwpt_set_dirty_tracking) * @flags: Combination of enum iommufd_hwpt_set_dirty_tracking_flags * @hwpt_id: HW pagetable ID that represents the IOMMU domain * @__reserved: Must be 0 * * Toggle dirty tracking on an HW pagetable. */ struct iommu_hwpt_set_dirty_tracking { … }; #define IOMMU_HWPT_SET_DIRTY_TRACKING … /** * enum iommufd_hwpt_get_dirty_bitmap_flags - Flags for getting dirty bits * @IOMMU_HWPT_GET_DIRTY_BITMAP_NO_CLEAR: Just read the PTEs without clearing * any dirty bits metadata. This flag * can be passed in the expectation * where the next operation is an unmap * of the same IOVA range. * */ enum iommufd_hwpt_get_dirty_bitmap_flags { … }; /** * struct iommu_hwpt_get_dirty_bitmap - ioctl(IOMMU_HWPT_GET_DIRTY_BITMAP) * @size: sizeof(struct iommu_hwpt_get_dirty_bitmap) * @hwpt_id: HW pagetable ID that represents the IOMMU domain * @flags: Combination of enum iommufd_hwpt_get_dirty_bitmap_flags * @__reserved: Must be 0 * @iova: base IOVA of the bitmap first bit * @length: IOVA range size * @page_size: page size granularity of each bit in the bitmap * @data: bitmap where to set the dirty bits. The bitmap bits each * represent a page_size which you deviate from an arbitrary iova. * * Checking a given IOVA is dirty: * * data[(iova / page_size) / 64] & (1ULL << ((iova / page_size) % 64)) * * Walk the IOMMU pagetables for a given IOVA range to return a bitmap * with the dirty IOVAs. In doing so it will also by default clear any * dirty bit metadata set in the IOPTE. */ struct iommu_hwpt_get_dirty_bitmap { … }; #define IOMMU_HWPT_GET_DIRTY_BITMAP … /** * enum iommu_hwpt_invalidate_data_type - IOMMU HWPT Cache Invalidation * Data Type * @IOMMU_HWPT_INVALIDATE_DATA_VTD_S1: Invalidation data for VTD_S1 */ enum iommu_hwpt_invalidate_data_type { … }; /** * enum iommu_hwpt_vtd_s1_invalidate_flags - Flags for Intel VT-d * stage-1 cache invalidation * @IOMMU_VTD_INV_FLAGS_LEAF: Indicates whether the invalidation applies * to all-levels page structure cache or just * the leaf PTE cache. */ enum iommu_hwpt_vtd_s1_invalidate_flags { … }; /** * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation * (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1) * @addr: The start address of the range to be invalidated. It needs to * be 4KB aligned. * @npages: Number of contiguous 4K pages to be invalidated. * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags * @__reserved: Must be 0 * * The Intel VT-d specific invalidation data for user-managed stage-1 cache * invalidation in nested translation. Userspace uses this structure to * tell the impacted cache scope after modifying the stage-1 page table. * * Invalidating all the caches related to the page table by setting @addr * to be 0 and @npages to be U64_MAX. * * The device TLB will be invalidated automatically if ATS is enabled. */ struct iommu_hwpt_vtd_s1_invalidate { … }; /** * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE) * @size: sizeof(struct iommu_hwpt_invalidate) * @hwpt_id: ID of a nested HWPT for cache invalidation * @data_uptr: User pointer to an array of driver-specific cache invalidation * data. * @data_type: One of enum iommu_hwpt_invalidate_data_type, defining the data * type of all the entries in the invalidation request array. It * should be a type supported by the hwpt pointed by @hwpt_id. * @entry_len: Length (in bytes) of a request entry in the request array * @entry_num: Input the number of cache invalidation requests in the array. * Output the number of requests successfully handled by kernel. * @__reserved: Must be 0. * * Invalidate the iommu cache for user-managed page table. Modifications on a * user-managed page table should be followed by this operation to sync cache. * Each ioctl can support one or more cache invalidation requests in the array * that has a total size of @entry_len * @entry_num. * * An empty invalidation request array by setting @entry_num==0 is allowed, and * @entry_len and @data_uptr would be ignored in this case. This can be used to * check if the given @data_type is supported or not by kernel. */ struct iommu_hwpt_invalidate { … }; #define IOMMU_HWPT_INVALIDATE … /** * enum iommu_hwpt_pgfault_flags - flags for struct iommu_hwpt_pgfault * @IOMMU_PGFAULT_FLAGS_PASID_VALID: The pasid field of the fault data is * valid. * @IOMMU_PGFAULT_FLAGS_LAST_PAGE: It's the last fault of a fault group. */ enum iommu_hwpt_pgfault_flags { … }; /** * enum iommu_hwpt_pgfault_perm - perm bits for struct iommu_hwpt_pgfault * @IOMMU_PGFAULT_PERM_READ: request for read permission * @IOMMU_PGFAULT_PERM_WRITE: request for write permission * @IOMMU_PGFAULT_PERM_EXEC: (PCIE 10.4.1) request with a PASID that has the * Execute Requested bit set in PASID TLP Prefix. * @IOMMU_PGFAULT_PERM_PRIV: (PCIE 10.4.1) request with a PASID that has the * Privileged Mode Requested bit set in PASID TLP * Prefix. */ enum iommu_hwpt_pgfault_perm { … }; /** * struct iommu_hwpt_pgfault - iommu page fault data * @flags: Combination of enum iommu_hwpt_pgfault_flags * @dev_id: id of the originated device * @pasid: Process Address Space ID * @grpid: Page Request Group Index * @perm: Combination of enum iommu_hwpt_pgfault_perm * @addr: Fault address * @length: a hint of how much data the requestor is expecting to fetch. For * example, if the PRI initiator knows it is going to do a 10MB * transfer, it could fill in 10MB and the OS could pre-fault in * 10MB of IOVA. It's default to 0 if there's no such hint. * @cookie: kernel-managed cookie identifying a group of fault messages. The * cookie number encoded in the last page fault of the group should * be echoed back in the response message. */ struct iommu_hwpt_pgfault { … }; /** * enum iommufd_page_response_code - Return status of fault handlers * @IOMMUFD_PAGE_RESP_SUCCESS: Fault has been handled and the page tables * populated, retry the access. This is the * "Success" defined in PCI 10.4.2.1. * @IOMMUFD_PAGE_RESP_INVALID: Could not handle this fault, don't retry the * access. This is the "Invalid Request" in PCI * 10.4.2.1. */ enum iommufd_page_response_code { … }; /** * struct iommu_hwpt_page_response - IOMMU page fault response * @cookie: The kernel-managed cookie reported in the fault message. * @code: One of response code in enum iommufd_page_response_code. */ struct iommu_hwpt_page_response { … }; /** * struct iommu_fault_alloc - ioctl(IOMMU_FAULT_QUEUE_ALLOC) * @size: sizeof(struct iommu_fault_alloc) * @flags: Must be 0 * @out_fault_id: The ID of the new FAULT * @out_fault_fd: The fd of the new FAULT * * Explicitly allocate a fault handling object. */ struct iommu_fault_alloc { … }; #define IOMMU_FAULT_QUEUE_ALLOC … #endif
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