117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef IOU_TW_H
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#define IOU_TW_H
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#include <linux/sched.h>
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#include <linux/percpu-refcount.h>
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#include <linux/io_uring_types.h>
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#define IO_LOCAL_TW_DEFAULT_MAX 20
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/*
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* Terminate the request if either of these conditions are true:
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*
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* 1) It's being executed by the original task, but that task is marked
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* with PF_EXITING as it's exiting.
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* 2) PF_KTHREAD is set, in which case the invoker of the task_work is
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* our fallback task_work.
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* 3) The ring has been closed and is going away.
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*/
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static inline bool io_should_terminate_tw(struct io_ring_ctx *ctx)
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{
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return (current->flags & (PF_EXITING | PF_KTHREAD)) || percpu_ref_is_dying(&ctx->refs);
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}
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void io_req_task_work_add_remote(struct io_kiocb *req, unsigned flags);
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struct llist_node *io_handle_tw_list(struct llist_node *node, unsigned int *count, unsigned int max_entries);
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void tctx_task_work(struct callback_head *cb);
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int io_run_local_work(struct io_ring_ctx *ctx, int min_events, int max_events);
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int io_run_task_work_sig(struct io_ring_ctx *ctx);
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__cold void io_fallback_req_func(struct work_struct *work);
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__cold void io_move_task_work_from_local(struct io_ring_ctx *ctx);
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int io_run_local_work_locked(struct io_ring_ctx *ctx, int min_events);
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void io_req_local_work_add(struct io_kiocb *req, unsigned flags);
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void io_req_normal_work_add(struct io_kiocb *req);
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struct llist_node *tctx_task_work_run(struct io_uring_task *tctx, unsigned int max_entries, unsigned int *count);
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static inline void __io_req_task_work_add(struct io_kiocb *req, unsigned flags)
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{
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if (req->ctx->flags & IORING_SETUP_DEFER_TASKRUN)
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io_req_local_work_add(req, flags);
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else
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io_req_normal_work_add(req);
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}
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static inline void io_req_task_work_add(struct io_kiocb *req)
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{
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__io_req_task_work_add(req, 0);
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}
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static inline int io_run_task_work(void)
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{
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bool ret = false;
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/*
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* Always check-and-clear the task_work notification signal. With how
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* signaling works for task_work, we can find it set with nothing to
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* run. We need to clear it for that case, like get_signal() does.
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*/
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if (test_thread_flag(TIF_NOTIFY_SIGNAL))
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clear_notify_signal();
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/*
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* PF_IO_WORKER never returns to userspace, so check here if we have
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* notify work that needs processing.
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*/
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if (current->flags & PF_IO_WORKER) {
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if (test_thread_flag(TIF_NOTIFY_RESUME)) {
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__set_current_state(TASK_RUNNING);
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resume_user_mode_work(NULL);
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}
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if (current->io_uring) {
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unsigned int count = 0;
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__set_current_state(TASK_RUNNING);
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tctx_task_work_run(current->io_uring, UINT_MAX, &count);
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if (count)
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ret = true;
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}
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}
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if (task_work_pending(current)) {
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__set_current_state(TASK_RUNNING);
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task_work_run();
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ret = true;
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}
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return ret;
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}
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static inline bool io_local_work_pending(struct io_ring_ctx *ctx)
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{
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return !llist_empty(&ctx->work_llist) || !llist_empty(&ctx->retry_llist);
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}
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static inline bool io_task_work_pending(struct io_ring_ctx *ctx)
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{
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return task_work_pending(current) || io_local_work_pending(ctx);
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}
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static inline void io_tw_lock(struct io_ring_ctx *ctx, io_tw_token_t tw)
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{
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lockdep_assert_held(&ctx->uring_lock);
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}
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static inline bool io_allowed_defer_tw_run(struct io_ring_ctx *ctx)
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{
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return likely(ctx->submitter_task == current);
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}
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static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
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{
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return likely(!(ctx->flags & IORING_SETUP_DEFER_TASKRUN) ||
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ctx->submitter_task == current);
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}
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#endif
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