mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-24 11:25:43 +00:00
54e60e505d
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAmOSYp4QHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpgWNEADTcHejQ5y8Ctc1BEsCiEnCbR5DeIwESBKN SfK7uK5N5GjKZgKeMtkdxNeckH2wSZ79VFpz2/b4fszM11H+P81r/PP+OwQojcra 1YyPbp2jXlQZGEYijiXYDohnKr8NnJYj/nuwm4T73OPOD48ekbrY36/t3Hd75jKk M5L/HOpbKhA+fypPHYlm3XlwEM9/4wupsDeiabTuAeFpLh66V/h85ZLY91c3Bf7j yllzT2CCGQsh+fnqdovpsqUxM4Sh6sHfa2QhwkfJFfU9OLwDz0TLlcvSVwWWICD1 DGeDE/MPBKZ4Z5zp8t94vTnZDAiExwkZbmCOnOkdYoPdMDqCDhp8a9WywV3IiJJi +hRN6Au6BWw8Rj3b3pbobfdXFJAvoHqXHM1SDAsWmEIMpuMhNalIpYqtna9JwRDe KV2ERMpGOUpmvQiRaJa5Wtz6hlFetmuav6Ij9DWb5f8+NXikiFAXk4g6TtD1Z7Cb 15klwM8qW50zX7YUlzBLcjNdj7+HuIswLx0obZ3Uv1ogDwMQKXEvPaAHUwVN02q6 cWP0P2Bc0EKvdwTSNpgNflhNsiV2DFJZpZfxkdPauN4t2EkJ38iEpHewffy0ecM7 uyaXGQVQW7WFDuGno4cGbThQIG95MqkRPBhEyB4cOmcyS/aZ92ZFtV1iI8dVDA+v uuEIMc3OCA== =EgDc -----END PGP SIGNATURE----- Merge tag 'for-6.2/io_uring-2022-12-08' of git://git.kernel.dk/linux Pull io_uring updates from Jens Axboe: - Always ensure proper ordering in case of CQ ring overflow, which then means we can remove some work-arounds for that (Dylan) - Support completion batching for multishot, greatly increasing the efficiency for those (Dylan) - Flag epoll/eventfd wakeups done from io_uring, so that we can easily tell if we're recursing into io_uring again. Previously, this would have resulted in repeated multishot notifications if we had a dependency there. That could happen if an eventfd was registered as the ring eventfd, and we multishot polled for events on it. Or if an io_uring fd was added to epoll, and io_uring had a multishot request for the epoll fd. Test cases here: https://git.kernel.dk/cgit/liburing/commit/?id=919755a7d0096fda08fb6d65ac54ad8d0fe027cd Previously these got terminated when the CQ ring eventually overflowed, now it's handled gracefully (me). - Tightening of the IOPOLL based completions (Pavel) - Optimizations of the networking zero-copy paths (Pavel) - Various tweaks and fixes (Dylan, Pavel) * tag 'for-6.2/io_uring-2022-12-08' of git://git.kernel.dk/linux: (41 commits) io_uring: keep unlock_post inlined in hot path io_uring: don't use complete_post in kbuf io_uring: spelling fix io_uring: remove io_req_complete_post_tw io_uring: allow multishot polled reqs to defer completion io_uring: remove overflow param from io_post_aux_cqe io_uring: add lockdep assertion in io_fill_cqe_aux io_uring: make io_fill_cqe_aux static io_uring: add io_aux_cqe which allows deferred completion io_uring: allow defer completion for aux posted cqes io_uring: defer all io_req_complete_failed io_uring: always lock in io_apoll_task_func io_uring: remove iopoll spinlock io_uring: iopoll protect complete_post io_uring: inline __io_req_complete_put() io_uring: remove io_req_tw_post_queue io_uring: use io_req_task_complete() in timeout io_uring: hold locks for io_req_complete_failed io_uring: add completion locking for iopoll io_uring: kill io_cqring_ev_posted() and __io_cq_unlock_post() ...
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* include/linux/eventfd.h
|
|
*
|
|
* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
|
|
*
|
|
*/
|
|
|
|
#ifndef _LINUX_EVENTFD_H
|
|
#define _LINUX_EVENTFD_H
|
|
|
|
#include <linux/fcntl.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/err.h>
|
|
#include <linux/percpu-defs.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/sched.h>
|
|
|
|
/*
|
|
* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
|
|
* new flags, since they might collide with O_* ones. We want
|
|
* to re-use O_* flags that couldn't possibly have a meaning
|
|
* from eventfd, in order to leave a free define-space for
|
|
* shared O_* flags.
|
|
*/
|
|
#define EFD_SEMAPHORE (1 << 0)
|
|
#define EFD_CLOEXEC O_CLOEXEC
|
|
#define EFD_NONBLOCK O_NONBLOCK
|
|
|
|
#define EFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK)
|
|
#define EFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS | EFD_SEMAPHORE)
|
|
|
|
struct eventfd_ctx;
|
|
struct file;
|
|
|
|
#ifdef CONFIG_EVENTFD
|
|
|
|
void eventfd_ctx_put(struct eventfd_ctx *ctx);
|
|
struct file *eventfd_fget(int fd);
|
|
struct eventfd_ctx *eventfd_ctx_fdget(int fd);
|
|
struct eventfd_ctx *eventfd_ctx_fileget(struct file *file);
|
|
__u64 eventfd_signal(struct eventfd_ctx *ctx, __u64 n);
|
|
__u64 eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n, unsigned mask);
|
|
int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx, wait_queue_entry_t *wait,
|
|
__u64 *cnt);
|
|
void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt);
|
|
|
|
static inline bool eventfd_signal_allowed(void)
|
|
{
|
|
return !current->in_eventfd;
|
|
}
|
|
|
|
#else /* CONFIG_EVENTFD */
|
|
|
|
/*
|
|
* Ugly ugly ugly error layer to support modules that uses eventfd but
|
|
* pretend to work in !CONFIG_EVENTFD configurations. Namely, AIO.
|
|
*/
|
|
|
|
static inline struct eventfd_ctx *eventfd_ctx_fdget(int fd)
|
|
{
|
|
return ERR_PTR(-ENOSYS);
|
|
}
|
|
|
|
static inline int eventfd_signal(struct eventfd_ctx *ctx, __u64 n)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int eventfd_signal_mask(struct eventfd_ctx *ctx, __u64 n,
|
|
unsigned mask)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline void eventfd_ctx_put(struct eventfd_ctx *ctx)
|
|
{
|
|
|
|
}
|
|
|
|
static inline int eventfd_ctx_remove_wait_queue(struct eventfd_ctx *ctx,
|
|
wait_queue_entry_t *wait, __u64 *cnt)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline bool eventfd_signal_allowed(void)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
|
|
{
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* _LINUX_EVENTFD_H */
|
|
|