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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _LINUX_IO_URING_CMD_H
3#define _LINUX_IO_URING_CMD_H
4
5#include <uapi/linux/io_uring.h>
6#include <linux/io_uring_types.h>
7#include <linux/blk-mq.h>
8
9/* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */
10#define IORING_URING_CMD_CANCELABLE (1U << 30)
11/* io_uring_cmd is being issued again */
12#define IORING_URING_CMD_REISSUE (1U << 31)
13
14struct io_uring_cmd {
15 struct file *file;
16 const struct io_uring_sqe *sqe;
17 u32 cmd_op;
18 u32 flags;
19 u8 pdu[32]; /* available inline for free use */
20 u8 unused[8];
21};
22
23static inline const void *io_uring_sqe_cmd(const struct io_uring_sqe *sqe)
24{
25 return sqe->cmd;
26}
27
28static inline void io_uring_cmd_private_sz_check(size_t cmd_sz)
29{
30 BUILD_BUG_ON(cmd_sz > sizeof_field(struct io_uring_cmd, pdu));
31}
32#define io_uring_cmd_to_pdu(cmd, pdu_type) ( \
33 io_uring_cmd_private_sz_check(sizeof(pdu_type)), \
34 ((pdu_type *)&(cmd)->pdu) \
35)
36
37#if defined(CONFIG_IO_URING)
38int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
39 struct iov_iter *iter,
40 struct io_uring_cmd *ioucmd,
41 unsigned int issue_flags);
42int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
43 const struct iovec __user *uvec,
44 size_t uvec_segs,
45 int ddir, struct iov_iter *iter,
46 unsigned issue_flags);
47
48/*
49 * Completes the request, i.e. posts an io_uring CQE and deallocates @ioucmd
50 * and the corresponding io_uring request.
51 *
52 * Note: the caller should never hard code @issue_flags and is only allowed
53 * to pass the mask provided by the core io_uring code.
54 */
55void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret, u64 res2,
56 unsigned issue_flags, bool is_cqe32);
57
58void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
59 io_req_tw_func_t task_work_cb,
60 unsigned flags);
61
62/*
63 * Note: the caller should never hard code @issue_flags and only use the
64 * mask provided by the core io_uring code.
65 */
66void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
67 unsigned int issue_flags);
68
69/* Execute the request from a blocking context */
70void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd);
71
72/*
73 * Select a buffer from the provided buffer group for multishot uring_cmd.
74 * Returns the selected buffer address and size.
75 */
76struct io_br_sel io_uring_cmd_buffer_select(struct io_uring_cmd *ioucmd,
77 unsigned buf_group, size_t *len,
78 unsigned int issue_flags);
79
80/*
81 * Complete a multishot uring_cmd event. This will post a CQE to the completion
82 * queue and update the provided buffer.
83 */
84bool io_uring_mshot_cmd_post_cqe(struct io_uring_cmd *ioucmd,
85 struct io_br_sel *sel, unsigned int issue_flags);
86
87#else
88static inline int
89io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
90 struct iov_iter *iter, struct io_uring_cmd *ioucmd,
91 unsigned int issue_flags)
92{
93 return -EOPNOTSUPP;
94}
95static inline int io_uring_cmd_import_fixed_vec(struct io_uring_cmd *ioucmd,
96 const struct iovec __user *uvec,
97 size_t uvec_segs,
98 int ddir, struct iov_iter *iter,
99 unsigned issue_flags)
100{
101 return -EOPNOTSUPP;
102}
103static inline void __io_uring_cmd_done(struct io_uring_cmd *cmd, s32 ret,
104 u64 ret2, unsigned issue_flags, bool is_cqe32)
105{
106}
107static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
108 io_req_tw_func_t task_work_cb, unsigned flags)
109{
110}
111static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
112 unsigned int issue_flags)
113{
114}
115static inline void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
116{
117}
118static inline struct io_br_sel
119io_uring_cmd_buffer_select(struct io_uring_cmd *ioucmd, unsigned buf_group,
120 size_t *len, unsigned int issue_flags)
121{
122 return (struct io_br_sel) { .val = -EOPNOTSUPP };
123}
124static inline bool io_uring_mshot_cmd_post_cqe(struct io_uring_cmd *ioucmd,
125 struct io_br_sel *sel, unsigned int issue_flags)
126{
127 return true;
128}
129#endif
130
131static inline struct io_uring_cmd *io_uring_cmd_from_tw(struct io_tw_req tw_req)
132{
133 return io_kiocb_to_cmd(tw_req.req, struct io_uring_cmd);
134}
135
136/* task_work executor checks the deferred list completion */
137#define IO_URING_CMD_TASK_WORK_ISSUE_FLAGS IO_URING_F_COMPLETE_DEFER
138
139/* users must follow the IOU_F_TWQ_LAZY_WAKE semantics */
140static inline void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd,
141 io_req_tw_func_t task_work_cb)
142{
143 __io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE);
144}
145
146static inline void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
147 io_req_tw_func_t task_work_cb)
148{
149 __io_uring_cmd_do_in_task(ioucmd, task_work_cb, 0);
150}
151
152static inline struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd)
153{
154 return cmd_to_io_kiocb(cmd)->tctx->task;
155}
156
157/*
158 * Return uring_cmd's context reference as its context handle for driver to
159 * track per-context resource, such as registered kernel IO buffer
160 */
161static inline void *io_uring_cmd_ctx_handle(struct io_uring_cmd *cmd)
162{
163 return cmd_to_io_kiocb(cmd)->ctx;
164}
165
166static inline void io_uring_cmd_done(struct io_uring_cmd *ioucmd, s32 ret,
167 unsigned issue_flags)
168{
169 return __io_uring_cmd_done(ioucmd, ret, 0, issue_flags, false);
170}
171
172static inline void io_uring_cmd_done32(struct io_uring_cmd *ioucmd, s32 ret,
173 u64 res2, unsigned issue_flags)
174{
175 return __io_uring_cmd_done(ioucmd, ret, res2, issue_flags, true);
176}
177
178int io_buffer_register_bvec(struct io_uring_cmd *cmd, struct request *rq,
179 void (*release)(void *), unsigned int index,
180 unsigned int issue_flags);
181int io_buffer_unregister_bvec(struct io_uring_cmd *cmd, unsigned int index,
182 unsigned int issue_flags);
183
184#endif /* _LINUX_IO_URING_CMD_H */