From ef060ea9e4fd3b763e7060a3af0a258d2d5d7c0d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Mon, 25 Apr 2022 19:49:04 -0600 Subject: io_uring: add IORING_SETUP_TASKRUN_FLAG If IORING_SETUP_COOP_TASKRUN is set to use cooperative scheduling for running task_work, then IORING_SETUP_TASKRUN_FLAG can be set so the application can tell if task_work is pending in the kernel for this ring. This allows use cases like io_uring_peek_cqe() to still function appropriately, or for the task to know when it would be useful to call io_uring_wait_cqe() to run pending events. Reviewed-by: Pavel Begunkov Link: https://lore.kernel.org/r/20220426014904.60384-7-axboe@kernel.dk Signed-off-by: Jens Axboe --- include/uapi/linux/io_uring.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'include') diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index a84f29d657c3..fad63564678a 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -110,6 +110,12 @@ enum { * a task running in userspace, and saves an IPI. */ #define IORING_SETUP_COOP_TASKRUN (1U << 8) +/* + * If COOP_TASKRUN is set, get notified if task work is available for + * running and a kernel transition would be needed to run it. This sets + * IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN. + */ +#define IORING_SETUP_TASKRUN_FLAG (1U << 9) enum { IORING_OP_NOP, @@ -256,6 +262,7 @@ struct io_sqring_offsets { */ #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ +#define IORING_SQ_TASKRUN (1U << 2) /* task should enter the kernel */ struct io_cqring_offsets { __u32 head; -- cgit v1.2.3-59-g8ed1b