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Man pages and test code are available in the following git repository: http://git.kernel.dk/cgit/liburing/
160 lines
4.2 KiB
C
160 lines
4.2 KiB
C
/*
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This file is part of Valgrind, a dynamic binary instrumentation framework.
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Copyright (C) 2019 Bart Van Assche <bvanassche@acm.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef _VKI_IO_URING_H_
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#define _VKI_IO_URING_H_
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// Derived from linux-5.2/include/uapi/linux/io_uring.h */
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/*
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* IO submission data structure (Submission Queue Entry)
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*/
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struct vki_io_uring_sqe {
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__vki_u8 opcode; /* type of operation for this sqe */
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__vki_u8 flags; /* IOSQE_ flags */
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__vki_u16 ioprio; /* ioprio for the request */
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__vki_s32 fd; /* file descriptor to do IO on */
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__vki_u64 off; /* offset into file */
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__vki_u64 addr; /* pointer to buffer or iovecs */
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__vki_u32 len; /* buffer size or number of iovecs */
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union {
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int rw_flags;
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__vki_u32 fsync_flags;
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__vki_u16 poll_events;
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__vki_u32 sync_range_flags;
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__vki_u32 msg_flags;
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};
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__vki_u64 user_data; /* data to be passed back at completion time */
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union {
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__vki_u16 buf_index; /* index into fixed buffers, if used */
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__vki_u64 __pad2[3];
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};
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};
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/*
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* sqe->flags
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*/
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#define VKI_IOSQE_FIXED_FILE (1U << 0) /* use fixed fileset */
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#define VKI_IOSQE_IO_DRAIN (1U << 1) /* issue after inflight IO */
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#define VKI_IOSQE_IO_LINK (1U << 2) /* links next sqe */
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/*
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* io_uring_setup() flags
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*/
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#define VKI_IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */
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#define VKI_IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */
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#define VKI_IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */
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#define VKI_IORING_OP_NOP 0
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#define VKI_IORING_OP_READV 1
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#define VKI_IORING_OP_WRITEV 2
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#define VKI_IORING_OP_FSYNC 3
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#define VKI_IORING_OP_READ_FIXED 4
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#define VKI_IORING_OP_WRITE_FIXED 5
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#define VKI_IORING_OP_POLL_ADD 6
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#define VKI_IORING_OP_POLL_REMOVE 7
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#define VKI_IORING_OP_SYNC_FILE_RANGE 8
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#define VKI_IORING_OP_SENDMSG 9
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#define VKI_IORING_OP_RECVMSG 10
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/*
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* sqe->fsync_flags
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*/
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#define VKI_IORING_FSYNC_DATASYNC (1U << 0)
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/*
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* IO completion data structure (Completion Queue Entry)
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*/
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struct vki_io_uring_cqe {
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__vki_u64 user_data; /* sqe->data submission passed back */
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__vki_s32 res; /* result code for this event */
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__vki_u32 flags;
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};
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/*
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* Magic offsets for the application to mmap the data it needs
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*/
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#define VKI_IORING_OFF_SQ_RING 0ULL
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#define VKI_IORING_OFF_CQ_RING 0x8000000ULL
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#define VKI_IORING_OFF_SQES 0x10000000ULL
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/*
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* Filled with the offset for mmap(2)
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*/
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struct vki_io_sqring_offsets {
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__vki_u32 head;
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__vki_u32 tail;
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__vki_u32 ring_mask;
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__vki_u32 ring_entries;
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__vki_u32 flags;
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__vki_u32 dropped;
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__vki_u32 array;
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__vki_u32 resv1;
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__vki_u64 resv2;
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};
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/*
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* sq_ring->flags
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*/
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#define VKI_IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */
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struct vki_io_cqring_offsets {
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__vki_u32 head;
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__vki_u32 tail;
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__vki_u32 ring_mask;
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__vki_u32 ring_entries;
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__vki_u32 overflow;
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__vki_u32 cqes;
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__vki_u64 resv[2];
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};
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/*
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* io_uring_enter(2) flags
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*/
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#define VKI_IORING_ENTER_GETEVENTS (1U << 0)
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#define VKI_IORING_ENTER_SQ_WAKEUP (1U << 1)
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/*
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* Passed in for io_uring_setup(2). Copied back with updated info on success
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*/
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struct vki_io_uring_params {
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__vki_u32 sq_entries;
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__vki_u32 cq_entries;
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__vki_u32 flags;
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__vki_u32 sq_thread_cpu;
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__vki_u32 sq_thread_idle;
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__vki_u32 resv[5];
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struct vki_io_sqring_offsets sq_off;
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struct vki_io_cqring_offsets cq_off;
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};
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/*
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* io_uring_register(2) opcodes and arguments
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*/
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#define VKI_IORING_REGISTER_BUFFERS 0
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#define VKI_IORING_UNREGISTER_BUFFERS 1
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#define VKI_IORING_REGISTER_FILES 2
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#define VKI_IORING_UNREGISTER_FILES 3
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#define VKI_IORING_REGISTER_EVENTFD 4
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#define VKI_IORING_UNREGISTER_EVENTFD 5
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#endif
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