50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#ifndef IOU_WAIT_H
|
|
#define IOU_WAIT_H
|
|
|
|
#include <linux/io_uring_types.h>
|
|
|
|
/*
|
|
* No waiters. It's larger than any valid value of the tw counter
|
|
* so that tests against ->cq_wait_nr would fail and skip wake_up().
|
|
*/
|
|
#define IO_CQ_WAKE_INIT (-1U)
|
|
/* Forced wake up if there is a waiter regardless of ->cq_wait_nr */
|
|
#define IO_CQ_WAKE_FORCE (IO_CQ_WAKE_INIT >> 1)
|
|
|
|
struct ext_arg {
|
|
size_t argsz;
|
|
struct timespec64 ts;
|
|
const sigset_t __user *sig;
|
|
ktime_t min_time;
|
|
bool ts_set;
|
|
bool iowait;
|
|
};
|
|
|
|
int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
|
|
struct ext_arg *ext_arg);
|
|
int io_run_task_work_sig(struct io_ring_ctx *ctx);
|
|
void io_cqring_do_overflow_flush(struct io_ring_ctx *ctx);
|
|
|
|
static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx)
|
|
{
|
|
return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head);
|
|
}
|
|
|
|
static inline unsigned int __io_cqring_events_user(struct io_ring_ctx *ctx)
|
|
{
|
|
return READ_ONCE(ctx->rings->cq.tail) - READ_ONCE(ctx->rings->cq.head);
|
|
}
|
|
|
|
/*
|
|
* Reads the tail/head of the CQ ring while providing an acquire ordering,
|
|
* see comment at top of io_uring.c.
|
|
*/
|
|
static inline unsigned io_cqring_events(struct io_ring_ctx *ctx)
|
|
{
|
|
smp_rmb();
|
|
return __io_cqring_events(ctx);
|
|
}
|
|
|
|
#endif
|