Rename t/aio-ring to t/io_uring

[fio.git] / os / io_uring.h

diff --git a/os/io_uring.h b/os/io_uring.h
new file mode 100644 (file)
index 0000000..61a3753
--- /dev/null
+++ b/os/io_uring.h
@@ -0,0 +1,99 @@
+#ifndef IO_URING_H
+#define IO_URING_H
+
+/*
+ * IO submission data structure
+ */
+struct io_uring_iocb {
+       u8      opcode;
+       u8      flags;
+       u16     ioprio;
+       s32     fd;
+       u64     off;
+       union {
+               void    *addr;
+               u64     __pad;
+       };
+       u32     len;
+       union {
+               __kernel_rwf_t  rw_flags;
+               u32             __resv;
+       };
+};
+
+/*
+ * io_uring_setup() flags
+ */
+#define IORING_SETUP_IOPOLL    (1 << 0)        /* io_context is polled */
+#define IORING_SETUP_FIXEDBUFS (1 << 1)        /* IO buffers are fixed */
+#define IORING_SETUP_SQTHREAD  (1 << 2)        /* Use SQ thread */
+#define IORING_SETUP_SQWQ      (1 << 3)        /* Use SQ workqueue */
+#define IORING_SETUP_SQPOLL    (1 << 4)        /* SQ thread polls */
+
+#define IORING_OP_READ         1
+#define IORING_OP_WRITE                2
+#define IORING_OP_FSYNC                3
+#define IORING_OP_FDSYNC       4
+#define IORING_OP_READ_FIXED   5
+#define IORING_OP_WRITE_FIXED  6
+
+/*
+ * IO completion data structure
+ */
+struct io_uring_event {
+       __u64   index;          /* what iocb this event came from */
+       s32     res;            /* result code for this event */
+       u32     flags;
+};
+
+#define IOEV_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_IOCB                        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 events;
+       u32 resv[4];
+};
+
+#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;
+};
+
+#endif