io_uring.h

  1#ifndef IOU_CORE_H
  2#define IOU_CORE_H
  3
  4#include <linux/errno.h>
  5#include <linux/lockdep.h>
  6#include <linux/resume_user_mode.h>
  7#include <linux/kasan.h>
  8#include <linux/poll.h>
  9#include <linux/io_uring_types.h>
 10#include <uapi/linux/eventpoll.h>
 11#include "alloc_cache.h"
 12#include "io-wq.h"
 13#include "slist.h"
 14#include "opdef.h"
 15
 16#ifndef CREATE_TRACE_POINTS
 17#include <trace/events/io_uring.h>
 18#endif
 19
 20struct io_rings_layout {
 21	/* size of CQ + headers + SQ offset array */
 22	size_t rings_size;
 23	size_t sq_size;
 24
 25	size_t sq_array_offset;
 26};
 27
 28struct io_ctx_config {
 29	struct io_uring_params p;
 30	struct io_rings_layout layout;
 31	struct io_uring_params __user *uptr;
 32};
 33
 34#define IORING_FEAT_FLAGS (IORING_FEAT_SINGLE_MMAP |\
 35			IORING_FEAT_NODROP |\
 36			IORING_FEAT_SUBMIT_STABLE |\
 37			IORING_FEAT_RW_CUR_POS |\
 38			IORING_FEAT_CUR_PERSONALITY |\
 39			IORING_FEAT_FAST_POLL |\
 40			IORING_FEAT_POLL_32BITS |\
 41			IORING_FEAT_SQPOLL_NONFIXED |\
 42			IORING_FEAT_EXT_ARG |\
 43			IORING_FEAT_NATIVE_WORKERS |\
 44			IORING_FEAT_RSRC_TAGS |\
 45			IORING_FEAT_CQE_SKIP |\
 46			IORING_FEAT_LINKED_FILE |\
 47			IORING_FEAT_REG_REG_RING |\
 48			IORING_FEAT_RECVSEND_BUNDLE |\
 49			IORING_FEAT_MIN_TIMEOUT |\
 50			IORING_FEAT_RW_ATTR |\
 51			IORING_FEAT_NO_IOWAIT)
 52
 53#define IORING_SETUP_FLAGS (IORING_SETUP_IOPOLL |\
 54			IORING_SETUP_SQPOLL |\
 55			IORING_SETUP_SQ_AFF |\
 56			IORING_SETUP_CQSIZE |\
 57			IORING_SETUP_CLAMP |\
 58			IORING_SETUP_ATTACH_WQ |\
 59			IORING_SETUP_R_DISABLED |\
 60			IORING_SETUP_SUBMIT_ALL |\
 61			IORING_SETUP_COOP_TASKRUN |\
 62			IORING_SETUP_TASKRUN_FLAG |\
 63			IORING_SETUP_SQE128 |\
 64			IORING_SETUP_CQE32 |\
 65			IORING_SETUP_SINGLE_ISSUER |\
 66			IORING_SETUP_DEFER_TASKRUN |\
 67			IORING_SETUP_NO_MMAP |\
 68			IORING_SETUP_REGISTERED_FD_ONLY |\
 69			IORING_SETUP_NO_SQARRAY |\
 70			IORING_SETUP_HYBRID_IOPOLL |\
 71			IORING_SETUP_CQE_MIXED |\
 72			IORING_SETUP_SQE_MIXED)
 73
 74#define IORING_ENTER_FLAGS (IORING_ENTER_GETEVENTS |\
 75			IORING_ENTER_SQ_WAKEUP |\
 76			IORING_ENTER_SQ_WAIT |\
 77			IORING_ENTER_EXT_ARG |\
 78			IORING_ENTER_REGISTERED_RING |\
 79			IORING_ENTER_ABS_TIMER |\
 80			IORING_ENTER_EXT_ARG_REG |\
 81			IORING_ENTER_NO_IOWAIT)
 82
 83
 84#define SQE_VALID_FLAGS (IOSQE_FIXED_FILE |\
 85			IOSQE_IO_DRAIN |\
 86			IOSQE_IO_LINK |\
 87			IOSQE_IO_HARDLINK |\
 88			IOSQE_ASYNC |\
 89			IOSQE_BUFFER_SELECT |\
 90			IOSQE_CQE_SKIP_SUCCESS)
 91
 92enum {
 93	IOU_COMPLETE		= 0,
 94
 95	IOU_ISSUE_SKIP_COMPLETE	= -EIOCBQUEUED,
 96
 97	/*
 98	 * The request has more work to do and should be retried. io_uring will
 99	 * attempt to wait on the file for eligible opcodes, but otherwise
100	 * it'll be handed to iowq for blocking execution. It works for normal
101	 * requests as well as for the multi shot mode.
102	 */
103	IOU_RETRY		= -EAGAIN,
104
105	/*
106	 * Requeue the task_work to restart operations on this request. The
107	 * actual value isn't important, should just be not an otherwise
108	 * valid error code, yet less than -MAX_ERRNO and valid internally.
109	 */
110	IOU_REQUEUE		= -3072,
111};
112
113struct io_defer_entry {
114	struct list_head	list;
115	struct io_kiocb		*req;
116};
117
118struct io_wait_queue {
119	struct wait_queue_entry wq;
120	struct io_ring_ctx *ctx;
121	unsigned cq_tail;
122	unsigned cq_min_tail;
123	unsigned nr_timeouts;
124	int hit_timeout;
125	ktime_t min_timeout;
126	ktime_t timeout;
127	struct hrtimer t;
128
129#ifdef CONFIG_NET_RX_BUSY_POLL
130	ktime_t napi_busy_poll_dt;
131	bool napi_prefer_busy_poll;
132#endif
133};
134
135static inline struct io_rings *io_get_rings(struct io_ring_ctx *ctx)
136{
137	return rcu_dereference_check(ctx->rings_rcu,
138			lockdep_is_held(&ctx->uring_lock) ||
139			lockdep_is_held(&ctx->completion_lock));
140}
141
142static inline bool io_should_wake(struct io_wait_queue *iowq)
143{
144	struct io_ring_ctx *ctx = iowq->ctx;
145	struct io_rings *rings;
146	int dist;
147
148	guard(rcu)();
149	rings = io_get_rings(ctx);
150
151	/*
152	 * Wake up if we have enough events, or if a timeout occurred since we
153	 * started waiting. For timeouts, we always want to return to userspace,
154	 * regardless of event count.
155	 */
156	dist = READ_ONCE(rings->cq.tail) - (int) iowq->cq_tail;
157	return dist >= 0 || atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
158}
159
160#define IORING_MAX_ENTRIES	32768
161#define IORING_MAX_CQ_ENTRIES	(2 * IORING_MAX_ENTRIES)
162
163int io_prepare_config(struct io_ctx_config *config);
164
165bool io_cqe_cache_refill(struct io_ring_ctx *ctx, bool overflow, bool cqe32);
166int io_run_task_work_sig(struct io_ring_ctx *ctx);
167int io_run_local_work(struct io_ring_ctx *ctx, int min_events, int max_events);
168void io_req_defer_failed(struct io_kiocb *req, s32 res);
169bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
170void io_add_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
171bool io_req_post_cqe(struct io_kiocb *req, s32 res, u32 cflags);
172bool io_req_post_cqe32(struct io_kiocb *req, struct io_uring_cqe src_cqe[2]);
173void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
174
175unsigned io_linked_nr(struct io_kiocb *req);
176void io_req_track_inflight(struct io_kiocb *req);
177struct file *io_file_get_normal(struct io_kiocb *req, int fd);
178struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
179			       unsigned issue_flags);
180
181void __io_req_task_work_add(struct io_kiocb *req, unsigned flags);
182void io_req_task_work_add_remote(struct io_kiocb *req, unsigned flags);
183void io_req_task_queue(struct io_kiocb *req);
184void io_req_task_complete(struct io_tw_req tw_req, io_tw_token_t tw);
185void io_req_task_queue_fail(struct io_kiocb *req, int ret);
186void io_req_task_submit(struct io_tw_req tw_req, io_tw_token_t tw);
187struct llist_node *io_handle_tw_list(struct llist_node *node, unsigned int *count, unsigned int max_entries);
188struct llist_node *tctx_task_work_run(struct io_uring_task *tctx, unsigned int max_entries, unsigned int *count);
189void tctx_task_work(struct callback_head *cb);
190__cold void io_uring_drop_tctx_refs(struct task_struct *task);
191
192int io_ring_add_registered_file(struct io_uring_task *tctx, struct file *file,
193				     int start, int end);
194void io_req_queue_iowq(struct io_kiocb *req);
195
196int io_poll_issue(struct io_kiocb *req, io_tw_token_t tw);
197int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
198int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin);
199__cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx);
200void __io_submit_flush_completions(struct io_ring_ctx *ctx);
201
202struct io_wq_work *io_wq_free_work(struct io_wq_work *work);
203void io_wq_submit_work(struct io_wq_work *work);
204
205void io_free_req(struct io_kiocb *req);
206void io_queue_next(struct io_kiocb *req);
207void io_task_refs_refill(struct io_uring_task *tctx);
208bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
209
210void io_activate_pollwq(struct io_ring_ctx *ctx);
211
212static inline void io_lockdep_assert_cq_locked(struct io_ring_ctx *ctx)
213{
214#if defined(CONFIG_PROVE_LOCKING)
215	lockdep_assert(in_task());
216
217	if (ctx->flags & IORING_SETUP_DEFER_TASKRUN)
218		lockdep_assert_held(&ctx->uring_lock);
219
220	if (ctx->flags & IORING_SETUP_IOPOLL) {
221		lockdep_assert_held(&ctx->uring_lock);
222	} else if (!ctx->task_complete) {
223		lockdep_assert_held(&ctx->completion_lock);
224	} else if (ctx->submitter_task) {
225		/*
226		 * ->submitter_task may be NULL and we can still post a CQE,
227		 * if the ring has been setup with IORING_SETUP_R_DISABLED.
228		 * Not from an SQE, as those cannot be submitted, but via
229		 * updating tagged resources.
230		 */
231		if (!percpu_ref_is_dying(&ctx->refs))
232			lockdep_assert(current == ctx->submitter_task);
233	}
234#endif
235}
236
237static inline bool io_is_compat(struct io_ring_ctx *ctx)
238{
239	return IS_ENABLED(CONFIG_COMPAT) && unlikely(ctx->compat);
240}
241
242static inline void io_req_task_work_add(struct io_kiocb *req)
243{
244	__io_req_task_work_add(req, 0);
245}
246
247static inline void io_submit_flush_completions(struct io_ring_ctx *ctx)
248{
249	if (!wq_list_empty(&ctx->submit_state.compl_reqs) ||
250	    ctx->submit_state.cq_flush)
251		__io_submit_flush_completions(ctx);
252}
253
254#define io_for_each_link(pos, head) \
255	for (pos = (head); pos; pos = pos->link)
256
257static inline bool io_get_cqe_overflow(struct io_ring_ctx *ctx,
258					struct io_uring_cqe **ret,
259					bool overflow, bool cqe32)
260{
261	io_lockdep_assert_cq_locked(ctx);
262
263	if (unlikely(ctx->cqe_sentinel - ctx->cqe_cached < (cqe32 + 1))) {
264		if (unlikely(!io_cqe_cache_refill(ctx, overflow, cqe32)))
265			return false;
266	}
267	*ret = ctx->cqe_cached;
268	ctx->cached_cq_tail++;
269	ctx->cqe_cached++;
270	if (ctx->flags & IORING_SETUP_CQE32) {
271		ctx->cqe_cached++;
272	} else if (cqe32 && ctx->flags & IORING_SETUP_CQE_MIXED) {
273		ctx->cqe_cached++;
274		ctx->cached_cq_tail++;
275	}
276	WARN_ON_ONCE(ctx->cqe_cached > ctx->cqe_sentinel);
277	return true;
278}
279
280static inline bool io_get_cqe(struct io_ring_ctx *ctx, struct io_uring_cqe **ret,
281				bool cqe32)
282{
283	return io_get_cqe_overflow(ctx, ret, false, cqe32);
284}
285
286static inline bool io_defer_get_uncommited_cqe(struct io_ring_ctx *ctx,
287					       struct io_uring_cqe **cqe_ret)
288{
289	io_lockdep_assert_cq_locked(ctx);
290
291	ctx->submit_state.cq_flush = true;
292	return io_get_cqe(ctx, cqe_ret, ctx->flags & IORING_SETUP_CQE_MIXED);
293}
294
295static __always_inline bool io_fill_cqe_req(struct io_ring_ctx *ctx,
296					    struct io_kiocb *req)
297{
298	bool is_cqe32 = req->cqe.flags & IORING_CQE_F_32;
299	struct io_uring_cqe *cqe;
300
301	/*
302	 * If we can't get a cq entry, userspace overflowed the submission
303	 * (by quite a lot).
304	 */
305	if (unlikely(!io_get_cqe(ctx, &cqe, is_cqe32)))
306		return false;
307
308	memcpy(cqe, &req->cqe, sizeof(*cqe));
309	if (ctx->flags & IORING_SETUP_CQE32 || is_cqe32) {
310		memcpy(cqe->big_cqe, &req->big_cqe, sizeof(*cqe));
311		memset(&req->big_cqe, 0, sizeof(req->big_cqe));
312	}
313
314	if (trace_io_uring_complete_enabled())
315		trace_io_uring_complete(req->ctx, req, cqe);
316	return true;
317}
318
319static inline void req_set_fail(struct io_kiocb *req)
320{
321	req->flags |= REQ_F_FAIL;
322	if (req->flags & REQ_F_CQE_SKIP) {
323		req->flags &= ~REQ_F_CQE_SKIP;
324		req->flags |= REQ_F_SKIP_LINK_CQES;
325	}
326}
327
328static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
329{
330	req->cqe.res = res;
331	req->cqe.flags = cflags;
332}
333
334static inline u32 ctx_cqe32_flags(struct io_ring_ctx *ctx)
335{
336	if (ctx->flags & IORING_SETUP_CQE_MIXED)
337		return IORING_CQE_F_32;
338	return 0;
339}
340
341static inline void io_req_set_res32(struct io_kiocb *req, s32 res, u32 cflags,
342				    __u64 extra1, __u64 extra2)
343{
344	req->cqe.res = res;
345	req->cqe.flags = cflags | ctx_cqe32_flags(req->ctx);
346	req->big_cqe.extra1 = extra1;
347	req->big_cqe.extra2 = extra2;
348}
349
350static inline void *io_uring_alloc_async_data(struct io_alloc_cache *cache,
351					      struct io_kiocb *req)
352{
353	if (cache) {
354		req->async_data = io_cache_alloc(cache, GFP_KERNEL);
355	} else {
356		const struct io_issue_def *def = &io_issue_defs[req->opcode];
357
358		WARN_ON_ONCE(!def->async_size);
359		req->async_data = kmalloc(def->async_size, GFP_KERNEL);
360	}
361	if (req->async_data)
362		req->flags |= REQ_F_ASYNC_DATA;
363	return req->async_data;
364}
365
366static inline bool req_has_async_data(struct io_kiocb *req)
367{
368	return req->flags & REQ_F_ASYNC_DATA;
369}
370
371static inline void io_req_async_data_clear(struct io_kiocb *req,
372					   io_req_flags_t extra_flags)
373{
374	req->flags &= ~(REQ_F_ASYNC_DATA|extra_flags);
375	req->async_data = NULL;
376}
377
378static inline void io_req_async_data_free(struct io_kiocb *req)
379{
380	kfree(req->async_data);
381	io_req_async_data_clear(req, 0);
382}
383
384static inline void io_put_file(struct io_kiocb *req)
385{
386	if (!(req->flags & REQ_F_FIXED_FILE) && req->file)
387		fput(req->file);
388}
389
390static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx,
391					 unsigned issue_flags)
392{
393	lockdep_assert_held(&ctx->uring_lock);
394	if (unlikely(issue_flags & IO_URING_F_UNLOCKED))
395		mutex_unlock(&ctx->uring_lock);
396}
397
398static inline void io_ring_submit_lock(struct io_ring_ctx *ctx,
399				       unsigned issue_flags)
400{
401	/*
402	 * "Normal" inline submissions always hold the uring_lock, since we
403	 * grab it from the system call. Same is true for the SQPOLL offload.
404	 * The only exception is when we've detached the request and issue it
405	 * from an async worker thread, grab the lock for that case.
406	 */
407	if (unlikely(issue_flags & IO_URING_F_UNLOCKED))
408		mutex_lock(&ctx->uring_lock);
409	lockdep_assert_held(&ctx->uring_lock);
410}
411
412static inline void io_commit_cqring(struct io_ring_ctx *ctx)
413{
414	/* order cqe stores with ring update */
415	smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
416}
417
418static inline void __io_wq_wake(struct wait_queue_head *wq)
419{
420	/*
421	 *
422	 * Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter
423	 * set in the mask so that if we recurse back into our own poll
424	 * waitqueue handlers, we know we have a dependency between eventfd or
425	 * epoll and should terminate multishot poll at that point.
426	 */
427	if (wq_has_sleeper(wq))
428		__wake_up(wq, TASK_NORMAL, 0, poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
429}
430
431static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
432{
433	__io_wq_wake(&ctx->poll_wq);
434}
435
436static inline void io_cqring_wake(struct io_ring_ctx *ctx)
437{
438	/*
439	 * Trigger waitqueue handler on all waiters on our waitqueue. This
440	 * won't necessarily wake up all the tasks, io_should_wake() will make
441	 * that decision.
442	 */
443
444	__io_wq_wake(&ctx->cq_wait);
445}
446
447static inline bool __io_sqring_full(struct io_ring_ctx *ctx)
448{
449	struct io_rings *r = io_get_rings(ctx);
450
451	/*
452	 * SQPOLL must use the actual sqring head, as using the cached_sq_head
453	 * is race prone if the SQPOLL thread has grabbed entries but not yet
454	 * committed them to the ring. For !SQPOLL, this doesn't matter, but
455	 * since this helper is just used for SQPOLL sqring waits (or POLLOUT),
456	 * just read the actual sqring head unconditionally.
457	 */
458	return READ_ONCE(r->sq.tail) - READ_ONCE(r->sq.head) == ctx->sq_entries;
459}
460
461static inline bool io_sqring_full(struct io_ring_ctx *ctx)
462{
463	guard(rcu)();
464	return __io_sqring_full(ctx);
465}
466
467static inline unsigned int __io_sqring_entries(struct io_ring_ctx *ctx)
468{
469	struct io_rings *rings = io_get_rings(ctx);
470	unsigned int entries;
471
472	/* make sure SQ entry isn't read before tail */
473	entries = smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
474	return min(entries, ctx->sq_entries);
475}
476
477static inline int io_run_task_work(void)
478{
479	bool ret = false;
480
481	/*
482	 * Always check-and-clear the task_work notification signal. With how
483	 * signaling works for task_work, we can find it set with nothing to
484	 * run. We need to clear it for that case, like get_signal() does.
485	 */
486	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
487		clear_notify_signal();
488	/*
489	 * PF_IO_WORKER never returns to userspace, so check here if we have
490	 * notify work that needs processing.
491	 */
492	if (current->flags & PF_IO_WORKER) {
493		if (test_thread_flag(TIF_NOTIFY_RESUME)) {
494			__set_current_state(TASK_RUNNING);
495			resume_user_mode_work(NULL);
496		}
497		if (current->io_uring) {
498			unsigned int count = 0;
499
500			__set_current_state(TASK_RUNNING);
501			tctx_task_work_run(current->io_uring, UINT_MAX, &count);
502			if (count)
503				ret = true;
504		}
505	}
506	if (task_work_pending(current)) {
507		__set_current_state(TASK_RUNNING);
508		task_work_run();
509		ret = true;
510	}
511
512	return ret;
513}
514
515static inline bool io_local_work_pending(struct io_ring_ctx *ctx)
516{
517	return !llist_empty(&ctx->work_llist) || !llist_empty(&ctx->retry_llist);
518}
519
520static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
521{
522	return task_work_pending(current) || io_local_work_pending(ctx);
523}
524
525static inline void io_tw_lock(struct io_ring_ctx *ctx, io_tw_token_t tw)
526{
527	lockdep_assert_held(&ctx->uring_lock);
528}
529
530static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
531{
532	guard(rcu)();
533	return __io_sqring_entries(ctx);
534}
535
536/*
537 * Don't complete immediately but use deferred completion infrastructure.
538 * Protected by ->uring_lock and can only be used either with
539 * IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex.
540 */
541static inline void io_req_complete_defer(struct io_kiocb *req)
542	__must_hold(&req->ctx->uring_lock)
543{
544	struct io_submit_state *state = &req->ctx->submit_state;
545
546	lockdep_assert_held(&req->ctx->uring_lock);
547
548	wq_list_add_tail(&req->comp_list, &state->compl_reqs);
549}
550
551static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
552{
553	if (unlikely(ctx->off_timeout_used ||
554		     ctx->has_evfd || ctx->poll_activated))
555		__io_commit_cqring_flush(ctx);
556}
557
558static inline void io_get_task_refs(int nr)
559{
560	struct io_uring_task *tctx = current->io_uring;
561
562	tctx->cached_refs -= nr;
563	if (unlikely(tctx->cached_refs < 0))
564		io_task_refs_refill(tctx);
565}
566
567static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
568{
569	return !ctx->submit_state.free_list.next;
570}
571
572extern struct kmem_cache *req_cachep;
573
574static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx)
575{
576	struct io_kiocb *req;
577
578	req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list);
579	wq_stack_extract(&ctx->submit_state.free_list);
580	return req;
581}
582
583static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req)
584{
585	if (unlikely(io_req_cache_empty(ctx))) {
586		if (!__io_alloc_req_refill(ctx))
587			return false;
588	}
589	*req = io_extract_req(ctx);
590	return true;
591}
592
593static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx)
594{
595	return likely(ctx->submitter_task == current);
596}
597
598static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
599{
600	return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) ||
601		      ctx->submitter_task == current);
602}
603
604static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)
605{
606	io_req_set_res(req, res, 0);
607	req->io_task_work.func = io_req_task_complete;
608	io_req_task_work_add(req);
609}
610
611static inline bool io_file_can_poll(struct io_kiocb *req)
612{
613	if (req->flags & REQ_F_CAN_POLL)
614		return true;
615	if (req->file && file_can_poll(req->file)) {
616		req->flags |= REQ_F_CAN_POLL;
617		return true;
618	}
619	return false;
620}
621
622static inline bool io_is_uring_cmd(const struct io_kiocb *req)
623{
624	return req->opcode == IORING_OP_URING_CMD ||
625	       req->opcode == IORING_OP_URING_CMD128;
626}
627
628static inline ktime_t io_get_time(struct io_ring_ctx *ctx)
629{
630	if (ctx->clockid == CLOCK_MONOTONIC)
631		return ktime_get();
632
633	return ktime_get_with_offset(ctx->clock_offset);
634}
635
636enum {
637	IO_CHECK_CQ_OVERFLOW_BIT,
638	IO_CHECK_CQ_DROPPED_BIT,
639};
640
641static inline bool io_has_work(struct io_ring_ctx *ctx)
642{
643	return test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq) ||
644	       io_local_work_pending(ctx);
645}
646#endif