Merge tag 'i3c/for-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux
[platform/kernel/linux-rpi.git] / io_uring / uring_cmd.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/errno.h>
4 #include <linux/file.h>
5 #include <linux/io_uring.h>
6 #include <linux/security.h>
7 #include <linux/nospec.h>
8
9 #include <uapi/linux/io_uring.h>
10 #include <uapi/asm-generic/ioctls.h>
11
12 #include "io_uring.h"
13 #include "rsrc.h"
14 #include "uring_cmd.h"
15
16 static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
17 {
18         struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
19         unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED;
20
21         ioucmd->task_work_cb(ioucmd, issue_flags);
22 }
23
24 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
25                         void (*task_work_cb)(struct io_uring_cmd *, unsigned),
26                         unsigned flags)
27 {
28         struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
29
30         ioucmd->task_work_cb = task_work_cb;
31         req->io_task_work.func = io_uring_cmd_work;
32         __io_req_task_work_add(req, flags);
33 }
34 EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
35
36 void io_uring_cmd_do_in_task_lazy(struct io_uring_cmd *ioucmd,
37                         void (*task_work_cb)(struct io_uring_cmd *, unsigned))
38 {
39         __io_uring_cmd_do_in_task(ioucmd, task_work_cb, IOU_F_TWQ_LAZY_WAKE);
40 }
41 EXPORT_SYMBOL_GPL(io_uring_cmd_do_in_task_lazy);
42
43 static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
44                                           u64 extra1, u64 extra2)
45 {
46         req->big_cqe.extra1 = extra1;
47         req->big_cqe.extra2 = extra2;
48 }
49
50 /*
51  * Called by consumers of io_uring_cmd, if they originally returned
52  * -EIOCBQUEUED upon receiving the command.
53  */
54 void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
55                        unsigned issue_flags)
56 {
57         struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
58
59         if (ret < 0)
60                 req_set_fail(req);
61
62         io_req_set_res(req, ret, 0);
63         if (req->ctx->flags & IORING_SETUP_CQE32)
64                 io_req_set_cqe32_extra(req, res2, 0);
65         if (req->ctx->flags & IORING_SETUP_IOPOLL) {
66                 /* order with io_iopoll_req_issued() checking ->iopoll_complete */
67                 smp_store_release(&req->iopoll_completed, 1);
68         } else {
69                 struct io_tw_state ts = {
70                         .locked = !(issue_flags & IO_URING_F_UNLOCKED),
71                 };
72                 io_req_task_complete(req, &ts);
73         }
74 }
75 EXPORT_SYMBOL_GPL(io_uring_cmd_done);
76
77 int io_uring_cmd_prep_async(struct io_kiocb *req)
78 {
79         struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
80
81         memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx));
82         ioucmd->sqe = req->async_data;
83         return 0;
84 }
85
86 int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
87 {
88         struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
89
90         if (sqe->__pad1)
91                 return -EINVAL;
92
93         ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
94         if (ioucmd->flags & ~IORING_URING_CMD_FIXED)
95                 return -EINVAL;
96
97         if (ioucmd->flags & IORING_URING_CMD_FIXED) {
98                 struct io_ring_ctx *ctx = req->ctx;
99                 u16 index;
100
101                 req->buf_index = READ_ONCE(sqe->buf_index);
102                 if (unlikely(req->buf_index >= ctx->nr_user_bufs))
103                         return -EFAULT;
104                 index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
105                 req->imu = ctx->user_bufs[index];
106                 io_req_set_rsrc_node(req, ctx, 0);
107         }
108         ioucmd->sqe = sqe;
109         ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
110         return 0;
111 }
112
113 int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
114 {
115         struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
116         struct io_ring_ctx *ctx = req->ctx;
117         struct file *file = req->file;
118         int ret;
119
120         if (!file->f_op->uring_cmd)
121                 return -EOPNOTSUPP;
122
123         ret = security_uring_cmd(ioucmd);
124         if (ret)
125                 return ret;
126
127         if (ctx->flags & IORING_SETUP_SQE128)
128                 issue_flags |= IO_URING_F_SQE128;
129         if (ctx->flags & IORING_SETUP_CQE32)
130                 issue_flags |= IO_URING_F_CQE32;
131         if (ctx->flags & IORING_SETUP_IOPOLL) {
132                 if (!file->f_op->uring_cmd_iopoll)
133                         return -EOPNOTSUPP;
134                 issue_flags |= IO_URING_F_IOPOLL;
135                 req->iopoll_completed = 0;
136                 WRITE_ONCE(ioucmd->cookie, NULL);
137         }
138
139         ret = file->f_op->uring_cmd(ioucmd, issue_flags);
140         if (ret == -EAGAIN) {
141                 if (!req_has_async_data(req)) {
142                         if (io_alloc_async_data(req))
143                                 return -ENOMEM;
144                         io_uring_cmd_prep_async(req);
145                 }
146                 return -EAGAIN;
147         }
148
149         if (ret != -EIOCBQUEUED) {
150                 if (ret < 0)
151                         req_set_fail(req);
152                 io_req_set_res(req, ret, 0);
153                 return ret;
154         }
155
156         return IOU_ISSUE_SKIP_COMPLETE;
157 }
158
159 int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
160                               struct iov_iter *iter, void *ioucmd)
161 {
162         struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
163
164         return io_import_fixed(rw, iter, req->imu, ubuf, len);
165 }
166 EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
167
168 int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
169 {
170         struct socket *sock = cmd->file->private_data;
171         struct sock *sk = sock->sk;
172         struct proto *prot = READ_ONCE(sk->sk_prot);
173         int ret, arg = 0;
174
175         if (!prot || !prot->ioctl)
176                 return -EOPNOTSUPP;
177
178         switch (cmd->sqe->cmd_op) {
179         case SOCKET_URING_OP_SIOCINQ:
180                 ret = prot->ioctl(sk, SIOCINQ, &arg);
181                 if (ret)
182                         return ret;
183                 return arg;
184         case SOCKET_URING_OP_SIOCOUTQ:
185                 ret = prot->ioctl(sk, SIOCOUTQ, &arg);
186                 if (ret)
187                         return ret;
188                 return arg;
189         default:
190                 return -EOPNOTSUPP;
191         }
192 }
193 EXPORT_SYMBOL_GPL(io_uring_cmd_sock);