mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 07:05:00 +07:00
def596e955
Add support for a polled io_uring instance. When a read or write is submitted to a polled io_uring, the application must poll for completions on the CQ ring through io_uring_enter(2). Polled IO may not generate IRQ completions, hence they need to be actively found by the application itself. To use polling, io_uring_setup() must be used with the IORING_SETUP_IOPOLL flag being set. It is illegal to mix and match polled and non-polled IO on an io_uring. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
/* 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 */
|
|
__u64 addr; /* pointer to buffer or iovecs */
|
|
__u32 len; /* buffer size or number of iovecs */
|
|
union {
|
|
__kernel_rwf_t rw_flags;
|
|
__u32 fsync_flags;
|
|
};
|
|
__u64 user_data; /* data to be passed back at completion time */
|
|
__u64 __pad2[3];
|
|
};
|
|
|
|
/*
|
|
* io_uring_setup() flags
|
|
*/
|
|
#define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */
|
|
|
|
#define IORING_OP_NOP 0
|
|
#define IORING_OP_READV 1
|
|
#define IORING_OP_WRITEV 2
|
|
#define IORING_OP_FSYNC 3
|
|
|
|
/*
|
|
* sqe->fsync_flags
|
|
*/
|
|
#define IORING_FSYNC_DATASYNC (1U << 0)
|
|
|
|
/*
|
|
* IO completion data structure (Completion Queue Entry)
|
|
*/
|
|
struct io_uring_cqe {
|
|
__u64 user_data; /* sqe->data submission passed back */
|
|
__s32 res; /* result code for this event */
|
|
__u32 flags;
|
|
};
|
|
|
|
/*
|
|
* 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 resv1;
|
|
__u64 resv2;
|
|
};
|
|
|
|
struct io_cqring_offsets {
|
|
__u32 head;
|
|
__u32 tail;
|
|
__u32 ring_mask;
|
|
__u32 ring_entries;
|
|
__u32 overflow;
|
|
__u32 cqes;
|
|
__u64 resv[2];
|
|
};
|
|
|
|
/*
|
|
* io_uring_enter(2) flags
|
|
*/
|
|
#define IORING_ENTER_GETEVENTS (1U << 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;
|
|
__u32 resv[7];
|
|
struct io_sqring_offsets sq_off;
|
|
struct io_cqring_offsets cq_off;
|
|
};
|
|
|
|
#endif
|