diff options
Diffstat (limited to 'io_uring/io_uring.h')
| -rw-r--r-- | io_uring/io_uring.h | 112 |
1 files changed, 55 insertions, 57 deletions
diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index e9f0d41ebb99..2711865f1e19 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -3,6 +3,8 @@ #include <linux/errno.h> #include <linux/lockdep.h> +#include <linux/resume_user_mode.h> +#include <linux/kasan.h> #include <linux/io_uring_types.h> #include <uapi/linux/eventpoll.h> #include "io-wq.h" @@ -28,8 +30,6 @@ enum { 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); -int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked); -int io_run_local_work(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); @@ -72,13 +72,25 @@ 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_put_task(struct task_struct *task, int nr); 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); @@ -92,6 +104,8 @@ 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; @@ -207,6 +221,13 @@ 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_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) { @@ -255,6 +276,15 @@ static inline int io_run_task_work(void) */ if (test_thread_flag(TIF_NOTIFY_SIGNAL)) clear_notify_signal(); + /* + * PF_IO_WORKER never returns to userspace, so check here if we have + * notify work that needs processing. + */ + if (current->flags & PF_IO_WORKER && + test_thread_flag(TIF_NOTIFY_RESUME)) { + __set_current_state(TASK_RUNNING); + resume_user_mode_work(NULL); + } if (task_work_pending(current)) { __set_current_state(TASK_RUNNING); task_work_run(); @@ -269,42 +299,6 @@ 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 int io_run_task_work_ctx(struct io_ring_ctx *ctx) -{ - int ret = 0; - int ret2; - - if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) - ret = io_run_local_work(ctx); - - /* want to run this after in case more is added */ - ret2 = io_run_task_work(); - - /* Try propagate error in favour of if tasks were run, - * but still make sure to run them if requested - */ - if (ret >= 0) - ret += ret2; - - return ret; -} - -static inline int io_run_local_work_locked(struct io_ring_ctx *ctx) -{ - bool locked; - int ret; - - if (llist_empty(&ctx->work_llist)) - return 0; - - locked = true; - ret = __io_run_local_work(ctx, &locked); - /* shouldn't happen! */ - if (WARN_ON_ONCE(!locked)) - mutex_lock(&ctx->uring_lock); - return ret; -} - static inline void io_tw_lock(struct io_ring_ctx *ctx, bool *locked) { if (!*locked) { @@ -330,19 +324,11 @@ static inline void io_req_complete_defer(struct io_kiocb *req) static inline void io_commit_cqring_flush(struct io_ring_ctx *ctx) { - if (unlikely(ctx->off_timeout_used || ctx->drain_active || ctx->has_evfd)) + if (unlikely(ctx->off_timeout_used || ctx->drain_active || + ctx->has_evfd || ctx->poll_activated)) __io_commit_cqring_flush(ctx); } -/* must to be called somewhat shortly after putting a request */ -static inline void io_put_task(struct task_struct *task, int nr) -{ - if (likely(task == current)) - task->io_uring->cached_refs += nr; - else - __io_put_task(task, nr); -} - static inline void io_get_task_refs(int nr) { struct io_uring_task *tctx = current->io_uring; @@ -357,19 +343,31 @@ 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) +extern struct kmem_cache *req_cachep; + +static inline struct io_kiocb *io_extract_req(struct io_ring_ctx *ctx) { - if (unlikely(io_req_cache_empty(ctx))) - return __io_alloc_req_refill(ctx); - return true; + 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 struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx) +static inline bool io_alloc_req(struct io_ring_ctx *ctx, struct io_kiocb **req) { - struct io_wq_work_node *node; + if (unlikely(io_req_cache_empty(ctx))) { + if (!__io_alloc_req_refill(ctx)) + return false; + } + *req = io_extract_req(ctx); + return true; +} - 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) |