387 lines
11 KiB
C
387 lines
11 KiB
C
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#ifndef IOU_CORE_H
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#define IOU_CORE_H
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#include <linux/errno.h>
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#include <linux/lockdep.h>
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#include <linux/resume_user_mode.h>
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#include <linux/kasan.h>
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#include <linux/io_uring_types.h>
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#include <uapi/linux/eventpoll.h>
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#include "io-wq.h"
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#include "slist.h"
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#include "filetable.h"
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#ifndef CREATE_TRACE_POINTS
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#include <trace/events/io_uring.h>
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#endif
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enum {
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IOU_OK = 0,
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IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED,
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/*
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* Intended only when both IO_URING_F_MULTISHOT is passed
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* to indicate to the poll runner that multishot should be
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* removed and the result is set on req->cqe.res.
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*/
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IOU_STOP_MULTISHOT = -ECANCELED,
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};
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struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx, bool overflow);
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bool io_req_cqe_overflow(struct io_kiocb *req);
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int io_run_task_work_sig(struct io_ring_ctx *ctx);
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void io_req_defer_failed(struct io_kiocb *req, s32 res);
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void io_req_complete_post(struct io_kiocb *req, unsigned issue_flags);
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bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags);
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bool io_aux_cqe(struct io_ring_ctx *ctx, bool defer, u64 user_data, s32 res, u32 cflags,
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bool allow_overflow);
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void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
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struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages);
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struct file *io_file_get_normal(struct io_kiocb *req, int fd);
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struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
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unsigned issue_flags);
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static inline bool io_req_ffs_set(struct io_kiocb *req)
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{
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return req->flags & REQ_F_FIXED_FILE;
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}
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void __io_req_task_work_add(struct io_kiocb *req, bool allow_local);
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bool io_is_uring_fops(struct file *file);
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bool io_alloc_async_data(struct io_kiocb *req);
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void io_req_task_queue(struct io_kiocb *req);
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void io_queue_iowq(struct io_kiocb *req, bool *dont_use);
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void io_req_task_complete(struct io_kiocb *req, bool *locked);
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void io_req_task_queue_fail(struct io_kiocb *req, int ret);
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void io_req_task_submit(struct io_kiocb *req, bool *locked);
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void tctx_task_work(struct callback_head *cb);
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__cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd);
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int io_uring_alloc_task_context(struct task_struct *task,
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struct io_ring_ctx *ctx);
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int io_poll_issue(struct io_kiocb *req, bool *locked);
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int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr);
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int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin);
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void io_free_batch_list(struct io_ring_ctx *ctx, struct io_wq_work_node *node);
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int io_req_prep_async(struct io_kiocb *req);
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struct io_wq_work *io_wq_free_work(struct io_wq_work *work);
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void io_wq_submit_work(struct io_wq_work *work);
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void io_free_req(struct io_kiocb *req);
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void io_queue_next(struct io_kiocb *req);
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void io_task_refs_refill(struct io_uring_task *tctx);
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bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
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bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
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bool cancel_all);
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#define io_lockdep_assert_cq_locked(ctx) \
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do { \
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if (ctx->flags & IORING_SETUP_IOPOLL) { \
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lockdep_assert_held(&ctx->uring_lock); \
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} else if (!ctx->task_complete) { \
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lockdep_assert_held(&ctx->completion_lock); \
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} else if (ctx->submitter_task->flags & PF_EXITING) { \
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lockdep_assert(current_work()); \
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} else { \
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lockdep_assert(current == ctx->submitter_task); \
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} \
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} while (0)
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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, true);
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}
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#define io_for_each_link(pos, head) \
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for (pos = (head); pos; pos = pos->link)
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void io_cq_unlock_post(struct io_ring_ctx *ctx);
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static inline struct io_uring_cqe *io_get_cqe_overflow(struct io_ring_ctx *ctx,
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bool overflow)
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{
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io_lockdep_assert_cq_locked(ctx);
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if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) {
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struct io_uring_cqe *cqe = ctx->cqe_cached;
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ctx->cached_cq_tail++;
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ctx->cqe_cached++;
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if (ctx->flags & IORING_SETUP_CQE32)
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ctx->cqe_cached++;
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return cqe;
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}
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return __io_get_cqe(ctx, overflow);
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}
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static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx)
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{
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return io_get_cqe_overflow(ctx, false);
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}
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static inline bool __io_fill_cqe_req(struct io_ring_ctx *ctx,
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struct io_kiocb *req)
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{
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struct io_uring_cqe *cqe;
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/*
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* If we can't get a cq entry, userspace overflowed the
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* submission (by quite a lot). Increment the overflow count in
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* the ring.
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*/
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cqe = io_get_cqe(ctx);
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if (unlikely(!cqe))
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return false;
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trace_io_uring_complete(req->ctx, req, req->cqe.user_data,
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req->cqe.res, req->cqe.flags,
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(req->flags & REQ_F_CQE32_INIT) ? req->extra1 : 0,
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(req->flags & REQ_F_CQE32_INIT) ? req->extra2 : 0);
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memcpy(cqe, &req->cqe, sizeof(*cqe));
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if (ctx->flags & IORING_SETUP_CQE32) {
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u64 extra1 = 0, extra2 = 0;
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if (req->flags & REQ_F_CQE32_INIT) {
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extra1 = req->extra1;
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extra2 = req->extra2;
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}
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WRITE_ONCE(cqe->big_cqe[0], extra1);
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WRITE_ONCE(cqe->big_cqe[1], extra2);
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}
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return true;
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}
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static inline bool io_fill_cqe_req(struct io_ring_ctx *ctx,
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struct io_kiocb *req)
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{
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if (likely(__io_fill_cqe_req(ctx, req)))
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return true;
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return io_req_cqe_overflow(req);
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}
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static inline void req_set_fail(struct io_kiocb *req)
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{
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req->flags |= REQ_F_FAIL;
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if (req->flags & REQ_F_CQE_SKIP) {
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req->flags &= ~REQ_F_CQE_SKIP;
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req->flags |= REQ_F_SKIP_LINK_CQES;
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}
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}
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static inline void io_req_set_res(struct io_kiocb *req, s32 res, u32 cflags)
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{
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req->cqe.res = res;
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req->cqe.flags = cflags;
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}
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static inline bool req_has_async_data(struct io_kiocb *req)
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{
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return req->flags & REQ_F_ASYNC_DATA;
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}
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static inline void io_put_file(struct file *file)
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{
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if (file)
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fput(file);
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}
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static inline void io_ring_submit_unlock(struct io_ring_ctx *ctx,
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unsigned issue_flags)
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{
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lockdep_assert_held(&ctx->uring_lock);
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if (issue_flags & IO_URING_F_UNLOCKED)
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mutex_unlock(&ctx->uring_lock);
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}
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static inline void io_ring_submit_lock(struct io_ring_ctx *ctx,
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unsigned issue_flags)
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{
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/*
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* "Normal" inline submissions always hold the uring_lock, since we
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* grab it from the system call. Same is true for the SQPOLL offload.
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* The only exception is when we've detached the request and issue it
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* from an async worker thread, grab the lock for that case.
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*/
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if (issue_flags & IO_URING_F_UNLOCKED)
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mutex_lock(&ctx->uring_lock);
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lockdep_assert_held(&ctx->uring_lock);
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}
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static inline void io_commit_cqring(struct io_ring_ctx *ctx)
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{
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/* order cqe stores with ring update */
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smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail);
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}
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static inline void io_poll_wq_wake(struct io_ring_ctx *ctx)
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{
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if (wq_has_sleeper(&ctx->poll_wq))
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__wake_up(&ctx->poll_wq, TASK_NORMAL, 0,
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poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
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}
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/* requires smb_mb() prior, see wq_has_sleeper() */
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static inline void __io_cqring_wake(struct io_ring_ctx *ctx)
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{
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/*
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* Trigger waitqueue handler on all waiters on our waitqueue. This
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* won't necessarily wake up all the tasks, io_should_wake() will make
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* that decision.
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*
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* Pass in EPOLLIN|EPOLL_URING_WAKE as the poll wakeup key. The latter
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* set in the mask so that if we recurse back into our own poll
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* waitqueue handlers, we know we have a dependency between eventfd or
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* epoll and should terminate multishot poll at that point.
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*/
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if (waitqueue_active(&ctx->cq_wait))
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__wake_up(&ctx->cq_wait, TASK_NORMAL, 0,
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poll_to_key(EPOLL_URING_WAKE | EPOLLIN));
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}
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static inline void io_cqring_wake(struct io_ring_ctx *ctx)
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{
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smp_mb();
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__io_cqring_wake(ctx);
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}
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static inline bool io_sqring_full(struct io_ring_ctx *ctx)
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{
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struct io_rings *r = ctx->rings;
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return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == ctx->sq_entries;
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}
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static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
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{
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struct io_rings *rings = ctx->rings;
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/* make sure SQ entry isn't read before tail */
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return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
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}
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static inline int io_run_task_work(void)
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{
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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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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 (task_work_pending(current)) {
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__set_current_state(TASK_RUNNING);
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task_work_run();
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return 1;
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}
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return 0;
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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) || !wq_list_empty(&ctx->work_llist);
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}
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static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked)
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{
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if (!*locked) {
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mutex_lock(&ctx->uring_lock);
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*locked = true;
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}
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}
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/*
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* Don't complete immediately but use deferred completion infrastructure.
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* Protected by ->uring_lock and can only be used either with
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* IO_URING_F_COMPLETE_DEFER or inside a tw handler holding the mutex.
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*/
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static inline void io_req_complete_defer(struct io_kiocb *req)
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__must_hold(&req->ctx->uring_lock)
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{
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struct io_submit_state *state = &req->ctx->submit_state;
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lockdep_assert_held(&req->ctx->uring_lock);
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wq_list_add_tail(&req->comp_list, &state->compl_reqs);
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}
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static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx)
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{
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if (unlikely(ctx->off_timeout_used || ctx->drain_active ||
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ctx->has_evfd || ctx->poll_activated))
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__io_commit_cqring_flush(ctx);
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}
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static inline void io_get_task_refs(int nr)
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{
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struct io_uring_task *tctx = current->io_uring;
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tctx->cached_refs -= nr;
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if (unlikely(tctx->cached_refs < 0))
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io_task_refs_refill(tctx);
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}
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static inline bool io_req_cache_empty(struct io_ring_ctx *ctx)
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{
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return !ctx->submit_state.free_list.next;
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}
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extern struct kmem_cache *req_cachep;
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|
||
|
|
static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx)
|
||
|
|
{
|
||
|
|
struct io_kiocb *req;
|
||
|
|
|
||
|
|
req = container_of(ctx->submit_state.free_list.next, struct io_kiocb, comp_list);
|
||
|
|
kasan_unpoison_object_data(req_cachep, req);
|
||
|
|
wq_stack_extract(&ctx->submit_state.free_list);
|
||
|
|
return req;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req)
|
||
|
|
{
|
||
|
|
if (unlikely(io_req_cache_empty(ctx))) {
|
||
|
|
if (!__io_alloc_req_refill(ctx))
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
*req = io_extract_req(ctx);
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
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
|