From patchwork Fri Sep 6 22:57:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 13794840 Received: from mail-ej1-f46.google.com (mail-ej1-f46.google.com [209.85.218.46]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B739B15B0F2; Fri, 6 Sep 2024 22:56:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.46 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725663419; cv=none; b=hNzKIkaRhUQx8tBdZYqU56vvh2fCACvNkgjvPyZOogicq5Q0ytrpPSIC1MijlisguVwoM9CBTOsh88WkfZosJjvkE7YtGAaVbtj+DT2hm39inD79sJ5h6cVKVuIOwZ90Qeiij38E9wMzXjj52SmBBKZ20gREictEiGxdctVtQ+Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725663419; c=relaxed/simple; bh=2vI0bIvl9+D8oswmBaa6Rx1hzhaGczPhBrLqovoOrl0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=O03UiZUSTEuFNn7Zv29VUJNoS81fNMM3wykHCYmsKPl2NbJSx0fOj9BKqbFBWEanJ2jH8bZ5JPlfPa+vWsXOAmAr4+pmZv+iqv+m0D799TCFucuBK0xq0ebaMM3thzt4gbqxAK2fBWIfR+A3q1gKm4CiT8Sq2scaj6h/wVW+5M4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=SwR8lEJ5; arc=none smtp.client-ip=209.85.218.46 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SwR8lEJ5" Received: by mail-ej1-f46.google.com with SMTP id a640c23a62f3a-a86910caf9cso656010866b.1; Fri, 06 Sep 2024 15:56:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1725663415; x=1726268215; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KZ8pkxfeOzRC4kA801xaO2cK98vlGCE9d9luTt+J2Kg=; b=SwR8lEJ5ondmHg/1e9TsKsQFdULJuXaDKO/CJ1PX6Aa+RnORvkZqOwG7iYcXRs+7XM mtLxrm/mMz5b2lsucTjTGnMVbUCP1ixBvumAB8lBvZfqf1OyTk4MNQKdsABelDMhYlAB LDn/ariGe1ewP1jSa8NF+TeGgvdItFIIUx95MObdLBME2lIoLnI0xBDUUvEdWSm1xRHQ 8RODGEThzPXSTlNdMAO/e7GxkR5UyVxPPimeC1jH26hds6Wf/2Hj8D4J7HE5LNvNyAOe Zd81IevGzueFq79TfHzms3sxIfr8rZtyngGMrA7r1bdeqHU7he848wYw3FgK4Md1XB2f Mg7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725663415; x=1726268215; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=KZ8pkxfeOzRC4kA801xaO2cK98vlGCE9d9luTt+J2Kg=; b=NeBJokr4yywidkmVUG6GOp7+/9ruUs7AoVhPppGaNn+m22bD8H1tXVt+ovf10CQ8EC rUN28Z+PHJbUW7ZciRdxtxCDwSnMgdLJA0dZLm2DtHqzZIzdNZEP7uV5dxKnoiHNOc5w 4RV52mRu1HYefv5iz/IWz4oTq31dOvz9rPMp1MbpjW4FbnBXh9W+D5OhJffizmdJnSur 0VGLYvTJHsoRCX/hJwUV3NiedWZiHC94/8O/rINuyltL90Sl3VVtDBdwBtXWclaiul7l O6gkUxZvCYc9uEmPklBgBwLCsVeK7pV63GBj0TXJQGybTQ1vEhQtJgrpPWhZHXnS6lqu 1uAA== X-Forwarded-Encrypted: i=1; AJvYcCV/9iraSgTK1hMx23znzXVCxXFm0gRHJ/hn8GoGi8ay6H3YO8fVB4tv7FouaJo81VUGnhA/vuIt4x5C8w==@vger.kernel.org X-Gm-Message-State: AOJu0Yx8Dc8rzJ+ny5zFjRq7Qxq+gRx5pnl9sE9H8gEAHnVDlO0eMjqo lKnjCctQa0nZ/QwgxdMqMGO+2TVhrQpIk1ekDMr3ibjRM5uaRQhWZ32ISPSb X-Google-Smtp-Source: AGHT+IHyXvN1ue7B3ODRoTm6YInUy1vTPF5mt5XLGTBYTGrDKLCROG5nKHfbHCNql8pi+pUWW0OV0g== X-Received: by 2002:a17:907:2d2b:b0:a8b:58e3:ac1f with SMTP id a640c23a62f3a-a8b595ddc9bmr313555066b.12.1725663415255; Fri, 06 Sep 2024 15:56:55 -0700 (PDT) Received: from 127.0.0.1localhost ([148.252.146.236]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a8d25d54978sm2679566b.199.2024.09.06.15.56.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Sep 2024 15:56:54 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com, Conrad Meyer , linux-block@vger.kernel.org, linux-mm@kvack.org, Christoph Hellwig Subject: [PATCH v4 1/8] io_uring/cmd: expose iowq to cmds Date: Fri, 6 Sep 2024 23:57:18 +0100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 When an io_uring request needs blocking context we offload it to the io_uring's thread pool called io-wq. We can get there off ->uring_cmd by returning -EAGAIN, but there is no straightforward way of doing that from an asynchronous callback. Add a helper that would transfer a command to a blocking context. Note, we do an extra hop via task_work before io_queue_iowq(), that's a limitation of io_uring infra we have that can likely be lifted later if that would ever become a problem. Signed-off-by: Pavel Begunkov --- include/linux/io_uring/cmd.h | 6 ++++++ io_uring/io_uring.c | 11 +++++++++++ io_uring/io_uring.h | 1 + io_uring/uring_cmd.c | 7 +++++++ 4 files changed, 25 insertions(+) diff --git a/include/linux/io_uring/cmd.h b/include/linux/io_uring/cmd.h index 447fbfd32215..86ceb3383e49 100644 --- a/include/linux/io_uring/cmd.h +++ b/include/linux/io_uring/cmd.h @@ -48,6 +48,9 @@ void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags); +/* Execute the request from a blocking context */ +void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd); + #else static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, struct iov_iter *iter, void *ioucmd) @@ -67,6 +70,9 @@ static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, unsigned int issue_flags) { } +static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) +{ +} #endif /* diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 1aca501efaf6..86cf31902841 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -533,6 +533,17 @@ static void io_queue_iowq(struct io_kiocb *req) io_queue_linked_timeout(link); } +static void io_req_queue_iowq_tw(struct io_kiocb *req, struct io_tw_state *ts) +{ + io_queue_iowq(req); +} + +void io_req_queue_iowq(struct io_kiocb *req) +{ + req->io_task_work.func = io_req_queue_iowq_tw; + io_req_task_work_add(req); +} + static __cold void io_queue_deferred(struct io_ring_ctx *ctx) { while (!list_empty(&ctx->defer_list)) { diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h index 65078e641390..9d70b2cf7b1e 100644 --- a/io_uring/io_uring.h +++ b/io_uring/io_uring.h @@ -94,6 +94,7 @@ int io_uring_alloc_task_context(struct task_struct *task, int io_ring_add_registered_file(struct io_uring_task *tctx, struct file *file, int start, int end); +void io_req_queue_iowq(struct io_kiocb *req); int io_poll_issue(struct io_kiocb *req, struct io_tw_state *ts); int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr); diff --git a/io_uring/uring_cmd.c b/io_uring/uring_cmd.c index 8391c7c7c1ec..39c3c816ec78 100644 --- a/io_uring/uring_cmd.c +++ b/io_uring/uring_cmd.c @@ -277,6 +277,13 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, } EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); +void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd) +{ + struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); + + io_req_queue_iowq(req); +} + static inline int io_uring_cmd_getsockopt(struct socket *sock, struct io_uring_cmd *cmd, unsigned int issue_flags)