[fio.git] / os / io_uring.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * Header file for the io_uring interface.
 *
 * Copyright (C) 2019 Jens Axboe
 * Copyright (C) 2019 Christoph Hellwig
 */
#ifndef LINUX_IO_URING_H
#define LINUX_IO_URING_H

#include <linux/fs.h>
#include <linux/types.h>

/*
 * IO submission data structure (Submission Queue Entry)
 */
struct io_uring_sqe {
	__u8	opcode;		/* type of operation for this sqe */
	__u8	flags;		/* as of now unused */
	__u16	ioprio;		/* ioprio for the request */
	__s32	fd;		/* file descriptor to do IO on */
	__u64	off;		/* offset into file */
	union {
		void	*addr;	/* buffer or iovecs */
		__u64	__pad;
	};
	__u32	len;		/* buffer size or number of iovecs */
	union {
		__kernel_rwf_t	rw_flags;
		__u32		__resv;
	};
	__u16	buf_index;	/* index into fixed buffers, if used */
	__u16	__pad2[3];
	__u64	data;		/* data to be passed back at completion time */
};

/*
 * sqe->flags
 */
#define IOSQE_FIXED_BUFFER	(1 << 0)	/* use fixed buffer */

/*
 * io_uring_setup() flags
 */
#define IORING_SETUP_IOPOLL	(1 << 0)	/* io_context is polled */
#define IORING_SETUP_SQPOLL	(1 << 1)	/* SQ poll thread */
#define IORING_SETUP_SQ_AFF	(1 << 2)	/* sq_thread_cpu is valid */

#define IORING_OP_READV		1
#define IORING_OP_WRITEV	2
#define IORING_OP_FSYNC		3
#define IORING_OP_FDSYNC	4

/*
 * IO completion data structure (Completion Queue Entry)
 */
struct io_uring_cqe {
	__u64	data;		/* sqe->data submission passed back */
	__s32	res;		/* result code for this event */
	__u32	flags;
};

/*
 * io_uring_event->flags
 */
#define IOCQE_FLAG_CACHEHIT	(1 << 0)	/* IO did not hit media */

/*
 * Magic offsets for the application to mmap the data it needs
 */
#define IORING_OFF_SQ_RING		0ULL
#define IORING_OFF_CQ_RING		0x8000000ULL
#define IORING_OFF_SQES			0x10000000ULL

/*
 * Filled with the offset for mmap(2)
 */
struct io_sqring_offsets {
	__u32 head;
	__u32 tail;
	__u32 ring_mask;
	__u32 ring_entries;
	__u32 flags;
	__u32 dropped;
	__u32 array;
	__u32 resv[3];
};

#define IORING_SQ_NEED_WAKEUP	(1 << 0) /* needs io_uring_enter wakeup */

struct io_cqring_offsets {
	__u32 head;
	__u32 tail;
	__u32 ring_mask;
	__u32 ring_entries;
	__u32 overflow;
	__u32 cqes;
	__u32 resv[4];
};

/*
 * io_uring_enter(2) flags
 */
#define IORING_ENTER_GETEVENTS	(1 << 0)

/*
 * Passed in for io_uring_setup(2). Copied back with updated info on success
 */
struct io_uring_params {
	__u32 sq_entries;
	__u32 cq_entries;
	__u32 flags;
	__u16 sq_thread_cpu;
	__u16 resv[9];
	struct io_sqring_offsets sq_off;
	struct io_cqring_offsets cq_off;
};

/*
 * io_uring_register(2) opcodes and arguments
 */
#define IORING_REGISTER_BUFFERS		0
#define IORING_UNREGISTER_BUFFERS	1

struct io_uring_register_buffers {
	struct iovec *iovecs;
	unsigned nr_iovecs;
};

#endif
Commit	Line	Data
e2239016 JA	1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
	2	/*
	3	* Header file for the io_uring interface.
	4	*
	5	* Copyright (C) 2019 Jens Axboe
	6	* Copyright (C) 2019 Christoph Hellwig
	7	*/
	8	#ifndef LINUX_IO_URING_H
	9	#define LINUX_IO_URING_H
e31b8288	10
6e70fd30	11	#include <linux/fs.h>
e2239016	12	#include <linux/types.h>
6e70fd30	13
e31b8288	14	/*
f0403f94	15	* IO submission data structure (Submission Queue Entry)
e31b8288	16	*/
f0403f94	17	struct io_uring_sqe {
a7086591 JA	18	__u8 opcode; /* type of operation for this sqe */
	19	__u8 flags; /* as of now unused */
	20	__u16 ioprio; /* ioprio for the request */
	21	__s32 fd; /* file descriptor to do IO on */
	22	__u64 off; /* offset into file */
e31b8288	23	union {
a7086591	24	void addr; / buffer or iovecs */
e2239016	25	__u64 __pad;
e31b8288	26	};
a7086591	27	__u32 len; /* buffer size or number of iovecs */
e31b8288 JA	28	union {
e31b8288 JA	29	__kernel_rwf_t rw_flags;
e2239016	30	__u32 __resv;
e31b8288	31	};
2ea53ca3	32	__u16 buf_index; /* index into fixed buffers, if used */
a7086591 JA	33	__u16 __pad2[3];
a7086591 JA	34	__u64 data; /* data to be passed back at completion time */
e31b8288 JA	35	};
e31b8288 JA	36
2ea53ca3 JA	37	/*
	38	* sqe->flags
	39	*/
	40	#define IOSQE_FIXED_BUFFER (1 << 0) /* use fixed buffer */
	41
e31b8288 JA	42	/*
	43	* io_uring_setup() flags
	44	*/
	45	#define IORING_SETUP_IOPOLL (1 << 0) /* io_context is polled */
2ea53ca3 JA	46	#define IORING_SETUP_SQPOLL (1 << 1) /* SQ poll thread */
2ea53ca3 JA	47	#define IORING_SETUP_SQ_AFF (1 << 2) /* sq_thread_cpu is valid */
e31b8288	48
f0403f94 JA	49	#define IORING_OP_READV 1
f0403f94 JA	50	#define IORING_OP_WRITEV 2
e31b8288 JA	51	#define IORING_OP_FSYNC 3
e31b8288 JA	52	#define IORING_OP_FDSYNC 4
e31b8288 JA	53
e31b8288 JA	54	/*
f0403f94	55	* IO completion data structure (Completion Queue Entry)
e31b8288	56	*/
f0403f94	57	struct io_uring_cqe {
a7086591	58	__u64 data; /* sqe->data submission passed back */
e2239016 JA	59	__s32 res; /* result code for this event */
e2239016 JA	60	__u32 flags;
e31b8288 JA	61	};
e31b8288 JA	62
e2239016 JA	63	/*
	64	* io_uring_event->flags
	65	*/
f0403f94	66	#define IOCQE_FLAG_CACHEHIT (1 << 0) /* IO did not hit media */
e31b8288 JA	67
	68	/*
	69	* Magic offsets for the application to mmap the data it needs
	70	*/
	71	#define IORING_OFF_SQ_RING 0ULL
	72	#define IORING_OFF_CQ_RING 0x8000000ULL
f0403f94	73	#define IORING_OFF_SQES 0x10000000ULL
e31b8288 JA	74
	75	/*
	76	* Filled with the offset for mmap(2)
	77	*/
	78	struct io_sqring_offsets {
e2239016 JA	79	__u32 head;
	80	__u32 tail;
	81	__u32 ring_mask;
	82	__u32 ring_entries;
	83	__u32 flags;
	84	__u32 dropped;
	85	__u32 array;
	86	__u32 resv[3];
e31b8288 JA	87	};
	88
	89	#define IORING_SQ_NEED_WAKEUP (1 << 0) /* needs io_uring_enter wakeup */
	90
	91	struct io_cqring_offsets {
e2239016 JA	92	__u32 head;
	93	__u32 tail;
	94	__u32 ring_mask;
	95	__u32 ring_entries;
	96	__u32 overflow;
f0403f94	97	__u32 cqes;
e2239016	98	__u32 resv[4];
e31b8288 JA	99	};
e31b8288 JA	100
e2239016 JA	101	/*
	102	* io_uring_enter(2) flags
	103	*/
e31b8288 JA	104	#define IORING_ENTER_GETEVENTS (1 << 0)
	105
	106	/*
	107	* Passed in for io_uring_setup(2). Copied back with updated info on success
	108	*/
	109	struct io_uring_params {
e2239016 JA	110	__u32 sq_entries;
	111	__u32 cq_entries;
	112	__u32 flags;
	113	__u16 sq_thread_cpu;
	114	__u16 resv[9];
e31b8288 JA	115	struct io_sqring_offsets sq_off;
	116	struct io_cqring_offsets cq_off;
	117	};
	118
2ea53ca3 JA	119	/*
	120	* io_uring_register(2) opcodes and arguments
	121	*/
	122	#define IORING_REGISTER_BUFFERS 0
	123	#define IORING_UNREGISTER_BUFFERS 1
	124
	125	struct io_uring_register_buffers {
	126	struct iovec *iovecs;
	127	unsigned nr_iovecs;
	128	};
	129
e31b8288	130	#endif