[linux-block.git] / io_uring / io_uring.h

#ifndef IOU_CORE_H
#define IOU_CORE_H

#include <linux/errno.h>
#include <linux/lockdep.h>
#include <linux/io_uring_types.h>
#include <uapi/linux/eventpoll.h>
#include "io-wq.h"
#include "slist.h"
#include "filetable.h"

#ifndef CREATE_TRACE_POINTS
#include <trace/events/io_uring.h>
#endif

enum {
	IOU_OK			= 0,
	IOU_ISSUE_SKIP_COMPLETE	= -EIOCBQUEUED,

	/*
	 * Intended only when both IO_URING_F_MULTISHOT is passed
	 * to indicate to the poll runner that multishot should be
	 * removed and the result is set on req->cqe.res.
	 */
	IOU_STOP_MULTISHOT	= -ECANCELED,
};

struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow);
bool io_req_cqe_overflow(struct io_kiocb *req);
int io_run_task_work_sig(struct io_ring_ctx *ctx);
void io_req_defer_failed(struct io_kiocb *req, s32 res);
void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags);
bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags,
		bool allow_overflow);
void __io_commit_cqring_flush(struct io_ring_ctx *ctx);

struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages);

struct file *io_file_get_normal(struct io_kiocb *req, int fd);
struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
			       unsigned issue_flags);

static inline bool io_req_ffs_set(struct io_kiocb *req)
{
	return req->flags & REQ_F_FIXED_FILE;
}

void __io_req_task_work_add(struct io_kiocb *req, bool allow_local);
bool io_is_uring_fops(struct file *file);
bool io_alloc_async_data(struct io_kiocb *req);
void io_req_task_queue(struct io_kiocb *req);
void io_queue_iowq(struct io_kiocb *req, bool *dont_use);
void io_req_task_complete(struct io_kiocb *req, bool *locked);
void io_req_task_queue_fail(struct io_kiocb *req, int ret);
void io_req_task_submit(struct io_kiocb *req, bool *locked);
void tctx_task_work(struct callback_head *cb);
__cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
int io_uring_alloc_task_context(struct task_struct *task,
				struct io_ring_ctx *ctx);

int io_poll_issue(struct io_kiocb *req, bool *locked);
int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin);
void io_free_batch_list(struct io_ring_ctx *ctx, struct io_wq_work_node *node);
int io_req_prep_async(struct io_kiocb *req);

struct io_wq_work *io_wq_free_work(struct io_wq_work *work);
void io_wq_submit_work(struct io_wq_work *work);

void io_free_req(struct io_kiocb *req);
void io_queue_next(struct io_kiocb *req);
void io_task_refs_refill(struct io_uring_task *tctx);
bool __io_alloc_req_refill(struct io_ring_ctx *ctx);

bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
			bool cancel_all);

#define io_lockdep_assert_cq_locked(ctx)				\
	do {								\
		if (ctx->flags & IORING_SETUP_IOPOLL) {			\
			lockdep_assert_held(&ctx->uring_lock);		\
		} else if (!ctx->task_complete) {			\
			lockdep_assert_held(&ctx->completion_lock);	\
		} else if (ctx->submitter_task->flags & PF_EXITING) {	\
			lockdep_assert(current_work());			\
		} else {						\
			lockdep_assert(current == ctx->submitter_task);	\
		}							\
	} while (0)

static inline void io_req_task_work_add(struct io_kiocb *req)
{
	__io_req_task_work_add(req, true);
}

#define io_for_each_link(pos, head) \
	for (pos = (head); pos; pos = pos->link)

void io_cq_unlock_post(struct io_ring_ctx *ctx);

static inline struct io_uring_cqe *io_get_cqe_overflow(struct io_ring_ctx *ctx,
						       bool overflow)
{
	io_lockdep_assert_cq_locked(ctx);

	if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) {
		struct io_uring_cqe *cqe = ctx->cqe_cached;

		ctx->cached_cq_tail++;
		ctx->cqe_cached++;
		if (ctx->flags & IORING_SETUP_CQE32)
			ctx->cqe_cached++;
		return cqe;
	}

	return __io_get_cqe(ctx, overflow);
}

static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx)
{
	return io_get_cqe_overflow(ctx, false);
}

static inline bool __io_fill_cqe_req(struct io_ring_ctx *ctx,
				     struct io_kiocb *req)
{
	struct io_uring_cqe *cqe;

	/*
	 * If we can't get a cq entry, userspace overflowed the
	 * submission (by quite a lot). Increment the overflow count in
	 * the ring.
	 */
	cqe = io_get_cqe(ctx);
	if (unlikely(!cqe))
		return false;

	trace_io_uring_complete(req->ctx, req, req->cqe.user_data,
				req->cqe.res, req->cqe.flags,
				(req->flags & REQ_F_CQE32_INIT) ? req->extra1 : 0,
				(req->flags & REQ_F_CQE32_INIT) ? req->extra2 : 0);

	memcpy(cqe, &req->cqe, sizeof(*cqe));

	if (ctx->flags & IORING_SETUP_CQE32) {
		u64 extra1 = 0, extra2 = 0;

		if (req->flags & REQ_F_CQE32_INIT) {
			extra1 = req->extra1;
			extra2 = req->extra2;
		}

		WRITE_ONCE(cqe->big_cqe[0], extra1);
		WRITE_ONCE(cqe->big_cqe[1], extra2);
	}
	return true;
}

static inline bool io_fill_cqe_req(struct io_ring_ctx *ctx,
				   struct io_kiocb *req)
{
	if (likely(__io_fill_cqe_req(ctx, req)))
		return true;
	return io_req_cqe_overflow(req);
}

static inline void req_set_fail(struct io_kiocb *req)
{
	req->flags |= REQ_F_FAIL;
	if (req->flags & REQ_F_CQE_SKIP) {
		req->flags &= ~REQ_F_CQE_SKIP;
		req->flags |= REQ_F_SKIP_LINK_CQES;
	}
}

static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
{
	req->cqe.res = res;
	req->cqe.flags = cflags;
}

static inline bool req_has_async_data(struct io_kiocb *req)
{
	return req->flags & REQ_F_ASYNC_DATA;
}

static inline void io_put_file(struct file *file)
{
	if (file)
		fput(file);
}

static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx,
					 unsigned issue_flags)
{
	lockdep_assert_held(&ctx->uring_lock);
	if (issue_flags & IO_URING_F_UNLOCKED)
		mutex_unlock(&ctx->uring_lock);
}

static inline void io_ring_submit_lock(struct io_ring_ctx *ctx,
				       unsigned issue_flags)
{
	/*
	 * "Normal" inline submissions always hold the uring_lock, since we
	 * grab it from the system call. Same is true for the SQPOLL offload.
	 * The only exception is when we've detached the request and issue it
	 * from an async worker thread, grab the lock for that case.
	 */
	if (issue_flags & IO_URING_F_UNLOCKED)
		mutex_lock(&ctx->uring_lock);
	lockdep_assert_held(&ctx->uring_lock);
}

static inline void io_commit_cqring(struct io_ring_ctx *ctx)
{
	/* order cqe stores with ring update */
	smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
}

static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
{
	if (wq_has_sleeper(&ctx->poll_wq))
		__wake_up(&ctx->poll_wq, TASK_NORMAL, 0,
				poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}

/* requires smb_mb() prior, see wq_has_sleeper() */
static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
{
	/*
	 * Trigger waitqueue handler on all waiters on our waitqueue. This
	 * won't necessarily wake up all the tasks, io_should_wake() will make
	 * that decision.
	 *
	 * Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter
	 * set in the mask so that if we recurse back into our own poll
	 * waitqueue handlers, we know we have a dependency between eventfd or
	 * epoll and should terminate multishot poll at that point.
	 */
	if (waitqueue_active(&ctx->cq_wait))
		__wake_up(&ctx->cq_wait, TASK_NORMAL, 0,
				poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
}

static inline void io_cqring_wake(struct io_ring_ctx *ctx)
{
	smp_mb();
	__io_cqring_wake(ctx);
}

static inline bool io_sqring_full(struct io_ring_ctx *ctx)
{
	struct io_rings *r = ctx->rings;

	return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries;
}

static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
{
	struct io_rings *rings = ctx->rings;

	/* make sure SQ entry isn't read before tail */
	return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
}

static inline int io_run_task_work(void)
{
	/*
	 * Always check-and-clear the task_work notification signal. With how
	 * signaling works for task_work, we can find it set with nothing to
	 * run. We need to clear it for that case, like get_signal() does.
	 */
	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
		clear_notify_signal();
	if (task_work_pending(current)) {
		__set_current_state(TASK_RUNNING);
		task_work_run();
		return 1;
	}

	return 0;
}

static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
{
	return task_work_pending(current) || !wq_list_empty(&ctx->work_llist);
}

static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked)
{
	if (!*locked) {
		mutex_lock(&ctx->uring_lock);
		*locked = true;
	}
}

/*
 * Don't complete immediately but use deferred completion infrastructure.
 * Protected by ->uring_lock and can only be used either with
 * IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex.
 */
static inline void io_req_complete_defer(struct io_kiocb *req)
	__must_hold(&req->ctx->uring_lock)
{
	struct io_submit_state *state = &req->ctx->submit_state;

	lockdep_assert_held(&req->ctx->uring_lock);

	wq_list_add_tail(&req->comp_list, &state->compl_reqs);
}

static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
{
	if (unlikely(ctx->off_timeout_used || ctx->drain_active ||
		     ctx->has_evfd || ctx->poll_activated))
		__io_commit_cqring_flush(ctx);
}

static inline void io_get_task_refs(int nr)
{
	struct io_uring_task *tctx = current->io_uring;

	tctx->cached_refs -= nr;
	if (unlikely(tctx->cached_refs < 0))
		io_task_refs_refill(tctx);
}

static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
{
	return !ctx->submit_state.free_list.next;
}

static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx)
{
	if (unlikely(io_req_cache_empty(ctx)))
		return __io_alloc_req_refill(ctx);
	return true;
}

static inline struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx)
{
	struct io_wq_work_node *node;

	node = wq_stack_extract(&ctx->submit_state.free_list);
	return container_of(node, struct io_kiocb, comp_list);
}

static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx)
{
	return likely(ctx->submitter_task == current);
}

static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
{
	return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) ||
		      ctx->submitter_task == current);
}

static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)
{
	io_req_set_res(req, res, 0);
	req->io_task_work.func = io_req_task_complete;
	io_req_task_work_add(req);
}

#endif
Commit	Line	Data
de23077e JA	1	#ifndef IOU_CORE_H
	2	#define IOU_CORE_H
	3
	4	#include <linux/errno.h>
cd40cae2	5	#include <linux/lockdep.h>
ab1c84d8	6	#include <linux/io_uring_types.h>
44648532	7	#include <uapi/linux/eventpoll.h>
ab1c84d8	8	#include "io-wq.h"
a6b21fbb	9	#include "slist.h"
ab1c84d8	10	#include "filetable.h"
de23077e	11
f3b44f92 JA	12	#ifndef CREATE_TRACE_POINTS
	13	#include <trace/events/io_uring.h>
	14	#endif
	15
97b388d7 JA	16	enum {
	17	IOU_OK = 0,
	18	IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED,
114eccdf DY	19
114eccdf DY	20	/*
91482864 PB	21	* Intended only when both IO_URING_F_MULTISHOT is passed
91482864 PB	22	* to indicate to the poll runner that multishot should be
114eccdf DY	23	* removed and the result is set on req->cqe.res.
	24	*/
	25	IOU_STOP_MULTISHOT = -ECANCELED,
97b388d7 JA	26	};
97b388d7 JA	27
aa1df3a3	28	struct io_uring_cqe __io_get_cqe(struct io_ring_ctx ctx, bool overflow);
68494a65	29	bool io_req_cqe_overflow(struct io_kiocb *req);
c0e0d6ba	30	int io_run_task_work_sig(struct io_ring_ctx *ctx);
973fc83f	31	void io_req_defer_failed(struct io_kiocb *req, s32 res);
1bec951c	32	void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags);
b529c96a	33	bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
9b8c5475 DY	34	bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags,
9b8c5475 DY	35	bool allow_overflow);
9046c641 PB	36	void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
	37
	38	struct page *io_pin_pages(unsigned long ubuf, unsigned long len, int npages);
	39
	40	struct file io_file_get_normal(struct io_kiocb req, int fd);
	41	struct file io_file_get_fixed(struct io_kiocb req, int fd,
	42	unsigned issue_flags);
	43
f6b543fd JA	44	static inline bool io_req_ffs_set(struct io_kiocb *req)
	45	{
	46	return req->flags & REQ_F_FIXED_FILE;
	47	}
	48
e52d2e58	49	void __io_req_task_work_add(struct io_kiocb *req, bool allow_local);
9046c641 PB	50	bool io_is_uring_fops(struct file *file);
9046c641 PB	51	bool io_alloc_async_data(struct io_kiocb *req);
9046c641 PB	52	void io_req_task_queue(struct io_kiocb *req);
	53	void io_queue_iowq(struct io_kiocb req, bool dont_use);
	54	void io_req_task_complete(struct io_kiocb req, bool locked);
	55	void io_req_task_queue_fail(struct io_kiocb *req, int ret);
	56	void io_req_task_submit(struct io_kiocb req, bool locked);
	57	void tctx_task_work(struct callback_head *cb);
	58	__cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
	59	int io_uring_alloc_task_context(struct task_struct *task,
	60	struct io_ring_ctx *ctx);
	61
	62	int io_poll_issue(struct io_kiocb req, bool locked);
	63	int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
	64	int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin);
	65	void io_free_batch_list(struct io_ring_ctx ctx, struct io_wq_work_node node);
	66	int io_req_prep_async(struct io_kiocb *req);
	67
	68	struct io_wq_work io_wq_free_work(struct io_wq_work work);
	69	void io_wq_submit_work(struct io_wq_work *work);
	70
	71	void io_free_req(struct io_kiocb *req);
	72	void io_queue_next(struct io_kiocb *req);
63809137	73	void io_task_refs_refill(struct io_uring_task *tctx);
bd1a3783	74	bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
9046c641 PB	75
	76	bool io_match_task_safe(struct io_kiocb head, struct task_struct task,
	77	bool cancel_all);
	78
f26cc959 PB	79	#define io_lockdep_assert_cq_locked(ctx) \
	80	do { \
	81	if (ctx->flags & IORING_SETUP_IOPOLL) { \
	82	lockdep_assert_held(&ctx->uring_lock); \
	83	} else if (!ctx->task_complete) { \
	84	lockdep_assert_held(&ctx->completion_lock); \
	85	} else if (ctx->submitter_task->flags & PF_EXITING) { \
	86	lockdep_assert(current_work()); \
	87	} else { \
	88	lockdep_assert(current == ctx->submitter_task); \
	89	} \
	90	} while (0)
	91
e52d2e58 PB	92	static inline void io_req_task_work_add(struct io_kiocb *req)
	93	{
	94	__io_req_task_work_add(req, true);
	95	}
	96
9046c641 PB	97	#define io_for_each_link(pos, head) \
9046c641 PB	98	for (pos = (head); pos; pos = pos->link)
f3b44f92	99
25399321 PB	100	void io_cq_unlock_post(struct io_ring_ctx *ctx);
25399321 PB	101
aa1df3a3 PB	102	static inline struct io_uring_cqe io_get_cqe_overflow(struct io_ring_ctx ctx,
aa1df3a3 PB	103	bool overflow)
f3b44f92	104	{
f26cc959 PB	105	io_lockdep_assert_cq_locked(ctx);
f26cc959 PB	106
f3b44f92 JA	107	if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) {
	108	struct io_uring_cqe *cqe = ctx->cqe_cached;
	109
f3b44f92 JA	110	ctx->cached_cq_tail++;
f3b44f92 JA	111	ctx->cqe_cached++;
b3659a65 PB	112	if (ctx->flags & IORING_SETUP_CQE32)
b3659a65 PB	113	ctx->cqe_cached++;
f3b44f92 JA	114	return cqe;
	115	}
	116
aa1df3a3 PB	117	return __io_get_cqe(ctx, overflow);
	118	}
	119
	120	static inline struct io_uring_cqe io_get_cqe(struct io_ring_ctx ctx)
	121	{
	122	return io_get_cqe_overflow(ctx, false);
f3b44f92 JA	123	}
	124
	125	static inline bool __io_fill_cqe_req(struct io_ring_ctx *ctx,
	126	struct io_kiocb *req)
	127	{
	128	struct io_uring_cqe *cqe;
	129
e8c328c3 PB	130	/*
	131	* If we can't get a cq entry, userspace overflowed the
	132	* submission (by quite a lot). Increment the overflow count in
	133	* the ring.
	134	*/
	135	cqe = io_get_cqe(ctx);
	136	if (unlikely(!cqe))
f66f7342	137	return false;
e0486f3f DY	138
	139	trace_io_uring_complete(req->ctx, req, req->cqe.user_data,
	140	req->cqe.res, req->cqe.flags,
	141	(req->flags & REQ_F_CQE32_INIT) ? req->extra1 : 0,
	142	(req->flags & REQ_F_CQE32_INIT) ? req->extra2 : 0);
	143
e8c328c3 PB	144	memcpy(cqe, &req->cqe, sizeof(*cqe));
	145
	146	if (ctx->flags & IORING_SETUP_CQE32) {
f3b44f92 JA	147	u64 extra1 = 0, extra2 = 0;
	148
	149	if (req->flags & REQ_F_CQE32_INIT) {
	150	extra1 = req->extra1;
	151	extra2 = req->extra2;
	152	}
	153
e8c328c3 PB	154	WRITE_ONCE(cqe->big_cqe[0], extra1);
e8c328c3 PB	155	WRITE_ONCE(cqe->big_cqe[1], extra2);
f3b44f92	156	}
e8c328c3	157	return true;
f3b44f92 JA	158	}
f3b44f92 JA	159
f66f7342 PB	160	static inline bool io_fill_cqe_req(struct io_ring_ctx *ctx,
	161	struct io_kiocb *req)
	162	{
	163	if (likely(__io_fill_cqe_req(ctx, req)))
	164	return true;
	165	return io_req_cqe_overflow(req);
	166	}
	167
531113bb JA	168	static inline void req_set_fail(struct io_kiocb *req)
	169	{
	170	req->flags \|= REQ_F_FAIL;
	171	if (req->flags & REQ_F_CQE_SKIP) {
	172	req->flags &= ~REQ_F_CQE_SKIP;
	173	req->flags \|= REQ_F_SKIP_LINK_CQES;
	174	}
	175	}
	176
de23077e JA	177	static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
	178	{
	179	req->cqe.res = res;
	180	req->cqe.flags = cflags;
	181	}
	182
99f15d8d JA	183	static inline bool req_has_async_data(struct io_kiocb *req)
	184	{
	185	return req->flags & REQ_F_ASYNC_DATA;
	186	}
	187
531113bb JA	188	static inline void io_put_file(struct file *file)
	189	{
	190	if (file)
	191	fput(file);
	192	}
	193
cd40cae2 JA	194	static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx,
	195	unsigned issue_flags)
	196	{
	197	lockdep_assert_held(&ctx->uring_lock);
	198	if (issue_flags & IO_URING_F_UNLOCKED)
	199	mutex_unlock(&ctx->uring_lock);
	200	}
	201
	202	static inline void io_ring_submit_lock(struct io_ring_ctx *ctx,
	203	unsigned issue_flags)
	204	{
	205	/*
	206	* "Normal" inline submissions always hold the uring_lock, since we
	207	* grab it from the system call. Same is true for the SQPOLL offload.
	208	* The only exception is when we've detached the request and issue it
	209	* from an async worker thread, grab the lock for that case.
	210	*/
	211	if (issue_flags & IO_URING_F_UNLOCKED)
	212	mutex_lock(&ctx->uring_lock);
	213	lockdep_assert_held(&ctx->uring_lock);
	214	}
	215
f9ead18c JA	216	static inline void io_commit_cqring(struct io_ring_ctx *ctx)
	217	{
	218	/* order cqe stores with ring update */
	219	smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
	220	}
	221
7b235dd8 PB	222	static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
7b235dd8 PB	223	{
bca39f39	224	if (wq_has_sleeper(&ctx->poll_wq))
7b235dd8 PB	225	__wake_up(&ctx->poll_wq, TASK_NORMAL, 0,
	226	poll_to_key(EPOLL_URING_WAKE \| EPOLLIN));
	227	}
	228
fc86f9d3 PB	229	/* requires smb_mb() prior, see wq_has_sleeper() */
fc86f9d3 PB	230	static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
f3b44f92 JA	231	{
f3b44f92 JA	232	/*
44648532 JA	233	* Trigger waitqueue handler on all waiters on our waitqueue. This
	234	* won't necessarily wake up all the tasks, io_should_wake() will make
	235	* that decision.
	236	*
	237	* Pass in EPOLLIN\|EPOLL_URING_WAKE as the poll wakeup key. The latter
	238	* set in the mask so that if we recurse back into our own poll
	239	* waitqueue handlers, we know we have a dependency between eventfd or
	240	* epoll and should terminate multishot poll at that point.
f3b44f92	241	*/
fc86f9d3	242	if (waitqueue_active(&ctx->cq_wait))
44648532 JA	243	__wake_up(&ctx->cq_wait, TASK_NORMAL, 0,
44648532 JA	244	poll_to_key(EPOLL_URING_WAKE \| EPOLLIN));
f3b44f92 JA	245	}
f3b44f92 JA	246
fc86f9d3 PB	247	static inline void io_cqring_wake(struct io_ring_ctx *ctx)
	248	{
	249	smp_mb();
	250	__io_cqring_wake(ctx);
	251	}
	252
17437f31 JA	253	static inline bool io_sqring_full(struct io_ring_ctx *ctx)
	254	{
	255	struct io_rings *r = ctx->rings;
	256
	257	return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries;
	258	}
	259
	260	static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
	261	{
	262	struct io_rings *rings = ctx->rings;
	263
	264	/* make sure SQ entry isn't read before tail */
	265	return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
	266	}
	267
c0e0d6ba	268	static inline int io_run_task_work(void)
17437f31	269	{
7cfe7a09 JA	270	/*
	271	* Always check-and-clear the task_work notification signal. With how
	272	* signaling works for task_work, we can find it set with nothing to
	273	* run. We need to clear it for that case, like get_signal() does.
	274	*/
	275	if (test_thread_flag(TIF_NOTIFY_SIGNAL))
	276	clear_notify_signal();
46a525e1	277	if (task_work_pending(current)) {
17437f31	278	__set_current_state(TASK_RUNNING);
46a525e1	279	task_work_run();
c0e0d6ba	280	return 1;
17437f31 JA	281	}
17437f31 JA	282
c0e0d6ba DY	283	return 0;
	284	}
	285
dac6a0ea JA	286	static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
dac6a0ea JA	287	{
6434ec01	288	return task_work_pending(current) \|\| !wq_list_empty(&ctx->work_llist);
dac6a0ea JA	289	}
dac6a0ea JA	290
aa1e90f6 PB	291	static inline void io_tw_lock(struct io_ring_ctx ctx, bool locked)
	292	{
	293	if (!*locked) {
	294	mutex_lock(&ctx->uring_lock);
	295	*locked = true;
	296	}
	297	}
	298
9da070b1 PB	299	/*
	300	* Don't complete immediately but use deferred completion infrastructure.
	301	* Protected by ->uring_lock and can only be used either with
	302	* IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex.
	303	*/
	304	static inline void io_req_complete_defer(struct io_kiocb *req)
	305	__must_hold(&req->ctx->uring_lock)
aa1e90f6 PB	306	{
	307	struct io_submit_state *state = &req->ctx->submit_state;
	308
9da070b1 PB	309	lockdep_assert_held(&req->ctx->uring_lock);
9da070b1 PB	310
aa1e90f6 PB	311	wq_list_add_tail(&req->comp_list, &state->compl_reqs);
	312	}
	313
46929b08 PB	314	static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
46929b08 PB	315	{
bca39f39 PB	316	if (unlikely(ctx->off_timeout_used \|\| ctx->drain_active \|\|
bca39f39 PB	317	ctx->has_evfd \|\| ctx->poll_activated))
46929b08 PB	318	__io_commit_cqring_flush(ctx);
	319	}
	320
63809137 PB	321	static inline void io_get_task_refs(int nr)
	322	{
	323	struct io_uring_task *tctx = current->io_uring;
	324
	325	tctx->cached_refs -= nr;
	326	if (unlikely(tctx->cached_refs < 0))
	327	io_task_refs_refill(tctx);
	328	}
	329
bd1a3783 PB	330	static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
	331	{
	332	return !ctx->submit_state.free_list.next;
	333	}
	334
	335	static inline bool io_alloc_req_refill(struct io_ring_ctx *ctx)
	336	{
	337	if (unlikely(io_req_cache_empty(ctx)))
	338	return __io_alloc_req_refill(ctx);
	339	return true;
	340	}
	341
	342	static inline struct io_kiocb io_alloc_req(struct io_ring_ctx ctx)
	343	{
	344	struct io_wq_work_node *node;
	345
	346	node = wq_stack_extract(&ctx->submit_state.free_list);
	347	return container_of(node, struct io_kiocb, comp_list);
	348	}
	349
140102ae PB	350	static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx)
	351	{
	352	return likely(ctx->submitter_task == current);
	353	}
	354
76de6749 PB	355	static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
76de6749 PB	356	{
6567506b PB	357	return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) \|\|
6567506b PB	358	ctx->submitter_task == current);
76de6749 PB	359	}
76de6749 PB	360
833b5dff PB	361	static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)
	362	{
	363	io_req_set_res(req, res, 0);
	364	req->io_task_work.func = io_req_task_complete;
	365	io_req_task_work_add(req);
	366	}
	367
de23077e	368	#endif