diff options
Diffstat (limited to 'io_uring/io_uring.h')
| -rw-r--r-- | io_uring/io_uring.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index 71afb46070e3..22e6e52c42d2 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -5,11 +5,125 @@ #include <linux/lockdep.h> #include "io_uring_types.h" +#ifndef CREATE_TRACE_POINTS +#include <trace/events/io_uring.h> +#endif + enum { IOU_OK = 0, IOU_ISSUE_SKIP_COMPLETE = -EIOCBQUEUED, }; +bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, s32 res, + u32 cflags, u64 extra1, u64 extra2); + +static inline unsigned int __io_cqring_events(struct io_ring_ctx *ctx) +{ + return ctx->cached_cq_tail - READ_ONCE(ctx->rings->cq.head); +} + +/* + * writes to the cq entry need to come after reading head; the + * control dependency is enough as we're using WRITE_ONCE to + * fill the cq entry + */ +static inline struct io_uring_cqe *__io_get_cqe(struct io_ring_ctx *ctx) +{ + struct io_rings *rings = ctx->rings; + unsigned int off = ctx->cached_cq_tail & (ctx->cq_entries - 1); + unsigned int shift = 0; + unsigned int free, queued, len; + + if (ctx->flags & IORING_SETUP_CQE32) + shift = 1; + + /* userspace may cheat modifying the tail, be safe and do min */ + queued = min(__io_cqring_events(ctx), ctx->cq_entries); + free = ctx->cq_entries - queued; + /* we need a contiguous range, limit based on the current array offset */ + len = min(free, ctx->cq_entries - off); + if (!len) + return NULL; + + ctx->cached_cq_tail++; + ctx->cqe_cached = &rings->cqes[off]; + ctx->cqe_sentinel = ctx->cqe_cached + len; + ctx->cqe_cached++; + return &rings->cqes[off << shift]; +} + +static inline struct io_uring_cqe *io_get_cqe(struct io_ring_ctx *ctx) +{ + if (likely(ctx->cqe_cached < ctx->cqe_sentinel)) { + struct io_uring_cqe *cqe = ctx->cqe_cached; + + if (ctx->flags & IORING_SETUP_CQE32) { + unsigned int off = ctx->cqe_cached - ctx->rings->cqes; + + cqe += off; + } + + ctx->cached_cq_tail++; + ctx->cqe_cached++; + return cqe; + } + + return __io_get_cqe(ctx); +} + +static inline bool __io_fill_cqe_req(struct io_ring_ctx *ctx, + struct io_kiocb *req) +{ + struct io_uring_cqe *cqe; + + if (!(ctx->flags & IORING_SETUP_CQE32)) { + trace_io_uring_complete(req->ctx, req, req->cqe.user_data, + req->cqe.res, req->cqe.flags, 0, 0); + + /* + * 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 (likely(cqe)) { + memcpy(cqe, &req->cqe, sizeof(*cqe)); + return true; + } + + return io_cqring_event_overflow(ctx, req->cqe.user_data, + req->cqe.res, req->cqe.flags, + 0, 0); + } else { + u64 extra1 = 0, extra2 = 0; + + if (req->flags & REQ_F_CQE32_INIT) { + extra1 = req->extra1; + extra2 = req->extra2; + } + + trace_io_uring_complete(req->ctx, req, req->cqe.user_data, + req->cqe.res, req->cqe.flags, extra1, extra2); + + /* + * 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 (likely(cqe)) { + memcpy(cqe, &req->cqe, sizeof(struct io_uring_cqe)); + WRITE_ONCE(cqe->big_cqe[0], extra1); + WRITE_ONCE(cqe->big_cqe[1], extra2); + return true; + } + + return io_cqring_event_overflow(ctx, req->cqe.user_data, + req->cqe.res, req->cqe.flags, + extra1, extra2); + } +} + static inline void req_set_fail(struct io_kiocb *req) { req->flags |= REQ_F_FAIL; @@ -64,6 +178,17 @@ static inline void io_commit_cqring(struct io_ring_ctx *ctx) smp_store_release(&ctx->rings->cq.tail, ctx->cached_cq_tail); } +static inline void io_cqring_wake(struct io_ring_ctx *ctx) +{ + /* + * wake_up_all() may seem excessive, but io_wake_function() and + * io_should_wake() handle the termination of the loop and only + * wake as many waiters as we need to. + */ + if (wq_has_sleeper(&ctx->cq_wait)) + wake_up_all(&ctx->cq_wait); +} + static inline bool io_sqring_full(struct io_ring_ctx *ctx) { struct io_rings *r = ctx->rings; @@ -100,6 +225,7 @@ void __io_req_complete_post(struct io_kiocb *req); bool io_fill_cqe_aux(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags); void io_cqring_ev_posted(struct io_ring_ctx *ctx); +void __io_commit_cqring_flush(struct io_ring_ctx *ctx); struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages); @@ -110,7 +236,10 @@ struct file *io_file_get_fixed(struct io_kiocb *req, int fd, bool io_is_uring_fops(struct file *file); bool io_alloc_async_data(struct io_kiocb *req); void io_req_task_work_add(struct io_kiocb *req); +void io_req_task_prio_work_add(struct io_kiocb *req); void io_req_tw_post_queue(struct io_kiocb *req, s32 res, u32 cflags); +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); @@ -122,6 +251,8 @@ int io_uring_alloc_task_context(struct task_struct *task, 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); |