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From: Kanchan Joshi <joshi.k@samsung.com>
To: axboe@kernel.dk, hch@lst.de, kbusch@kernel.org
Cc: io-uring@vger.kernel.org, linux-nvme@lists.infradead.org,
	anuj20.g@samsung.com, javier.gonz@samsung.com, hare@suse.de,
	Kanchan Joshi <joshi.k@samsung.com>
Subject: [RFC PATCH 1/6] io_uring: add infra for uring_cmd completion in submitter-task.
Date: Thu,  5 Aug 2021 18:25:34 +0530	[thread overview]
Message-ID: <20210805125539.66958-2-joshi.k@samsung.com> (raw)
In-Reply-To: <20210805125539.66958-1-joshi.k@samsung.com>

Completion of a uring_cmd ioctl may involve referencing certain
ioctl-specific fields, requiring original submitter context.
Export an API that driver can use for this purpose.
The API facilitates reusing task-work infra of io_uring, while driver
gets to implement cmd-specific handling in a callback.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
Signed-off-by: Anuj Gupta <anuj20.g@samsung.com>
---
 fs/io_uring.c            | 16 ++++++++++++++++
 include/linux/io_uring.h |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 481ebd20352c..b73bc16c3e70 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2041,6 +2041,22 @@ static void io_req_task_submit(struct io_kiocb *req)
 	mutex_unlock(&ctx->uring_lock);
 }
 
+static void io_uring_cmd_work(struct io_kiocb *req)
+{
+	req->uring_cmd.driver_cb(&req->uring_cmd);
+}
+
+void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
+			void (*driver_cb)(struct io_uring_cmd *))
+{
+	struct io_kiocb *req = container_of(ioucmd, struct io_kiocb, uring_cmd);
+
+	req->uring_cmd.driver_cb = driver_cb;
+	req->io_task_work.func = io_uring_cmd_work;
+	io_req_task_work_add(req);
+}
+EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
+
 static void io_req_task_queue_fail(struct io_kiocb *req, int ret)
 {
 	req->result = ret;
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h
index ea20c16f9a64..235d1603f97e 100644
--- a/include/linux/io_uring.h
+++ b/include/linux/io_uring.h
@@ -14,11 +14,15 @@ struct io_uring_cmd {
 	__u16		op;
 	__u16		unused;
 	__u32		len;
+	/* used if driver requires update in task context*/
+	void (*driver_cb)(struct io_uring_cmd *cmd);
 	__u64		pdu[5];	/* 40 bytes available inline for free use */
 };
 
 #if defined(CONFIG_IO_URING)
 void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret);
+void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
+			void (*driver_cb)(struct io_uring_cmd *));
 struct sock *io_uring_get_socket(struct file *file);
 void __io_uring_cancel(struct files_struct *files);
 void __io_uring_free(struct task_struct *tsk);
@@ -41,6 +45,10 @@ static inline void io_uring_free(struct task_struct *tsk)
 static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret)
 {
 }
+static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
+			void (*driver_cb)(struct io_uring_cmd *))
+{
+}
 static inline struct sock *io_uring_get_socket(struct file *file)
 {
 	return NULL;
-- 
2.25.1


  parent reply	other threads:[~2021-08-05 13:15 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210805125910epcas5p1100e7093dd2b1ac5bbb751331e2ded23@epcas5p1.samsung.com>
2021-08-05 12:55 ` [RFC PATCH 0/6] Fixed-buffers io_uring passthrough over nvme-char Kanchan Joshi
     [not found]   ` <CGME20210805125917epcas5p4f75c9423a7b886dc79500901cc8f55ab@epcas5p4.samsung.com>
2021-08-05 12:55     ` Kanchan Joshi [this message]
     [not found]   ` <CGME20210805125923epcas5p10e6c1b95475440be68f58244d5a3cb9a@epcas5p1.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 2/6] nvme: wire-up support for async-passthru on char-device Kanchan Joshi
2021-09-07  7:46       ` Christoph Hellwig
2021-09-07 16:20         ` Kanchan Joshi
2021-09-08  6:15           ` Christoph Hellwig
2021-09-22  7:19             ` Kanchan Joshi
     [not found]   ` <CGME20210805125927epcas5p28f3413fe3d0a2baed37a05453df0d482@epcas5p2.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 3/6] io_uring: mark iopoll not supported for uring-cmd Kanchan Joshi
     [not found]   ` <CGME20210805125931epcas5p259fec172085ea34fdbf5a1c1f8da5e90@epcas5p2.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 4/6] io_uring: add helper for fixed-buffer uring-cmd Kanchan Joshi
2021-09-07  7:47       ` Christoph Hellwig
     [not found]   ` <CGME20210805125934epcas5p4ff88e95d558ad9f65d77a888a4211b18@epcas5p4.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 5/6] io_uring: add support for uring_cmd with fixed-buffer Kanchan Joshi
2021-09-07  7:48       ` Christoph Hellwig
2021-09-07 16:29         ` Kanchan Joshi
     [not found]   ` <CGME20210805125937epcas5p15667b460e28d87bd40400f69005aafe3@epcas5p1.samsung.com>
2021-08-05 12:55     ` [RFC PATCH 6/6] nvme: enable passthrough " Kanchan Joshi
2021-09-07  7:50       ` Christoph Hellwig
2021-09-07 16:47         ` Kanchan Joshi
2021-09-08  6:16           ` Christoph Hellwig
2021-09-07  7:10   ` [RFC PATCH 0/6] Fixed-buffers io_uring passthrough over nvme-char Christoph Hellwig
2021-09-07 12:38     ` Jens Axboe

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