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// 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
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