1 /* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR MIT */ 2 /* 3 * Header file for the io_uring interface. 4 * 5 * Copyright (C) 2019 Jens Axboe 6 * Copyright (C) 2019 Christoph Hellwig 7 */ 8 #ifndef LINUX_IO_URING_H 9 #define LINUX_IO_URING_H 10 11 #include <linux/fs.h> 12 #include <linux/types.h> 13 14 #ifdef __cplusplus 15 extern "C" { 16 #endif 17 18 /* 19 * IO submission data structure (Submission Queue Entry) 20 */ 21 struct io_uring_sqe { 22 __u8 opcode; /* type of operation for this sqe */ 23 __u8 flags; /* IOSQE_ flags */ 24 __u16 ioprio; /* ioprio for the request */ 25 __s32 fd; /* file descriptor to do IO on */ 26 union { 27 __u64 off; /* offset into file */ 28 __u64 addr2; 29 }; 30 union { 31 __u64 addr; /* pointer to buffer or iovecs */ 32 __u64 splice_off_in; 33 }; 34 __u32 len; /* buffer size or number of iovecs */ 35 union { 36 __kernel_rwf_t rw_flags; 37 __u32 fsync_flags; 38 __u16 poll_events; /* compatibility */ 39 __u32 poll32_events; /* word-reversed for BE */ 40 __u32 sync_range_flags; 41 __u32 msg_flags; 42 __u32 timeout_flags; 43 __u32 accept_flags; 44 __u32 cancel_flags; 45 __u32 open_flags; 46 __u32 statx_flags; 47 __u32 fadvise_advice; 48 __u32 splice_flags; 49 __u32 rename_flags; 50 __u32 unlink_flags; 51 __u32 hardlink_flags; 52 }; 53 __u64 user_data; /* data to be passed back at completion time */ 54 union { 55 struct { 56 /* pack this to avoid bogus arm OABI complaints */ 57 union { 58 /* index into fixed buffers, if used */ 59 __u16 buf_index; 60 /* for grouped buffer selection */ 61 __u16 buf_group; 62 } __attribute__((packed)); 63 /* personality to use, if used */ 64 __u16 personality; 65 __s32 splice_fd_in; 66 }; 67 __u64 __pad2[3]; 68 }; 69 }; 70 71 enum { 72 IOSQE_FIXED_FILE_BIT, 73 IOSQE_IO_DRAIN_BIT, 74 IOSQE_IO_LINK_BIT, 75 IOSQE_IO_HARDLINK_BIT, 76 IOSQE_ASYNC_BIT, 77 IOSQE_BUFFER_SELECT_BIT, 78 }; 79 80 /* 81 * sqe->flags 82 */ 83 /* use fixed fileset */ 84 #define IOSQE_FIXED_FILE (1U << IOSQE_FIXED_FILE_BIT) 85 /* issue after inflight IO */ 86 #define IOSQE_IO_DRAIN (1U << IOSQE_IO_DRAIN_BIT) 87 /* links next sqe */ 88 #define IOSQE_IO_LINK (1U << IOSQE_IO_LINK_BIT) 89 /* like LINK, but stronger */ 90 #define IOSQE_IO_HARDLINK (1U << IOSQE_IO_HARDLINK_BIT) 91 /* always go async */ 92 #define IOSQE_ASYNC (1U << IOSQE_ASYNC_BIT) 93 /* select buffer from sqe->buf_group */ 94 #define IOSQE_BUFFER_SELECT (1U << IOSQE_BUFFER_SELECT_BIT) 95 96 /* 97 * io_uring_setup() flags 98 */ 99 #define IORING_SETUP_IOPOLL (1U << 0) /* io_context is polled */ 100 #define IORING_SETUP_SQPOLL (1U << 1) /* SQ poll thread */ 101 #define IORING_SETUP_SQ_AFF (1U << 2) /* sq_thread_cpu is valid */ 102 #define IORING_SETUP_CQSIZE (1U << 3) /* app defines CQ size */ 103 #define IORING_SETUP_CLAMP (1U << 4) /* clamp SQ/CQ ring sizes */ 104 #define IORING_SETUP_ATTACH_WQ (1U << 5) /* attach to existing wq */ 105 #define IORING_SETUP_R_DISABLED (1U << 6) /* start with ring disabled */ 106 107 enum { 108 IORING_OP_NOP, 109 IORING_OP_READV, 110 IORING_OP_WRITEV, 111 IORING_OP_FSYNC, 112 IORING_OP_READ_FIXED, 113 IORING_OP_WRITE_FIXED, 114 IORING_OP_POLL_ADD, 115 IORING_OP_POLL_REMOVE, 116 IORING_OP_SYNC_FILE_RANGE, 117 IORING_OP_SENDMSG, 118 IORING_OP_RECVMSG, 119 IORING_OP_TIMEOUT, 120 IORING_OP_TIMEOUT_REMOVE, 121 IORING_OP_ACCEPT, 122 IORING_OP_ASYNC_CANCEL, 123 IORING_OP_LINK_TIMEOUT, 124 IORING_OP_CONNECT, 125 IORING_OP_FALLOCATE, 126 IORING_OP_OPENAT, 127 IORING_OP_CLOSE, 128 IORING_OP_FILES_UPDATE, 129 IORING_OP_STATX, 130 IORING_OP_READ, 131 IORING_OP_WRITE, 132 IORING_OP_FADVISE, 133 IORING_OP_MADVISE, 134 IORING_OP_SEND, 135 IORING_OP_RECV, 136 IORING_OP_OPENAT2, 137 IORING_OP_EPOLL_CTL, 138 IORING_OP_SPLICE, 139 IORING_OP_PROVIDE_BUFFERS, 140 IORING_OP_REMOVE_BUFFERS, 141 IORING_OP_TEE, 142 IORING_OP_SHUTDOWN, 143 IORING_OP_RENAMEAT, 144 IORING_OP_UNLINKAT, 145 IORING_OP_MKDIRAT, 146 IORING_OP_SYMLINKAT, 147 IORING_OP_LINKAT, 148 149 /* this goes last, obviously */ 150 IORING_OP_LAST, 151 }; 152 153 /* 154 * sqe->fsync_flags 155 */ 156 #define IORING_FSYNC_DATASYNC (1U << 0) 157 158 /* 159 * sqe->timeout_flags 160 */ 161 #define IORING_TIMEOUT_ABS (1U << 0) 162 #define IORING_TIMEOUT_UPDATE (1U << 1) 163 164 /* 165 * sqe->splice_flags 166 * extends splice(2) flags 167 */ 168 #define SPLICE_F_FD_IN_FIXED (1U << 31) /* the last bit of __u32 */ 169 170 /* 171 * POLL_ADD flags. Note that since sqe->poll_events is the flag space, the 172 * command flags for POLL_ADD are stored in sqe->len. 173 * 174 * IORING_POLL_ADD_MULTI Multishot poll. Sets IORING_CQE_F_MORE if 175 * the poll handler will continue to report 176 * CQEs on behalf of the same SQE. 177 * 178 * IORING_POLL_UPDATE Update existing poll request, matching 179 * sqe->addr as the old user_data field. 180 */ 181 #define IORING_POLL_ADD_MULTI (1U << 0) 182 #define IORING_POLL_UPDATE_EVENTS (1U << 1) 183 #define IORING_POLL_UPDATE_USER_DATA (1U << 2) 184 185 /* 186 * IO completion data structure (Completion Queue Entry) 187 */ 188 struct io_uring_cqe { 189 __u64 user_data; /* sqe->data submission passed back */ 190 __s32 res; /* result code for this event */ 191 __u32 flags; 192 }; 193 194 /* 195 * cqe->flags 196 * 197 * IORING_CQE_F_BUFFER If set, the upper 16 bits are the buffer ID 198 * IORING_CQE_F_MORE If set, parent SQE will generate more CQE entries 199 */ 200 #define IORING_CQE_F_BUFFER (1U << 0) 201 #define IORING_CQE_F_MORE (1U << 1) 202 203 enum { 204 IORING_CQE_BUFFER_SHIFT = 16, 205 }; 206 207 /* 208 * Magic offsets for the application to mmap the data it needs 209 */ 210 #define IORING_OFF_SQ_RING 0ULL 211 #define IORING_OFF_CQ_RING 0x8000000ULL 212 #define IORING_OFF_SQES 0x10000000ULL 213 214 /* 215 * Filled with the offset for mmap(2) 216 */ 217 struct io_sqring_offsets { 218 __u32 head; 219 __u32 tail; 220 __u32 ring_mask; 221 __u32 ring_entries; 222 __u32 flags; 223 __u32 dropped; 224 __u32 array; 225 __u32 resv1; 226 __u64 resv2; 227 }; 228 229 /* 230 * sq_ring->flags 231 */ 232 #define IORING_SQ_NEED_WAKEUP (1U << 0) /* needs io_uring_enter wakeup */ 233 #define IORING_SQ_CQ_OVERFLOW (1U << 1) /* CQ ring is overflown */ 234 235 struct io_cqring_offsets { 236 __u32 head; 237 __u32 tail; 238 __u32 ring_mask; 239 __u32 ring_entries; 240 __u32 overflow; 241 __u32 cqes; 242 __u32 flags; 243 __u32 resv1; 244 __u64 resv2; 245 }; 246 247 /* 248 * cq_ring->flags 249 */ 250 251 /* disable eventfd notifications */ 252 #define IORING_CQ_EVENTFD_DISABLED (1U << 0) 253 254 /* 255 * io_uring_enter(2) flags 256 */ 257 #define IORING_ENTER_GETEVENTS (1U << 0) 258 #define IORING_ENTER_SQ_WAKEUP (1U << 1) 259 #define IORING_ENTER_SQ_WAIT (1U << 2) 260 #define IORING_ENTER_EXT_ARG (1U << 3) 261 262 /* 263 * Passed in for io_uring_setup(2). Copied back with updated info on success 264 */ 265 struct io_uring_params { 266 __u32 sq_entries; 267 __u32 cq_entries; 268 __u32 flags; 269 __u32 sq_thread_cpu; 270 __u32 sq_thread_idle; 271 __u32 features; 272 __u32 wq_fd; 273 __u32 resv[3]; 274 struct io_sqring_offsets sq_off; 275 struct io_cqring_offsets cq_off; 276 }; 277 278 /* 279 * io_uring_params->features flags 280 */ 281 #define IORING_FEAT_SINGLE_MMAP (1U << 0) 282 #define IORING_FEAT_NODROP (1U << 1) 283 #define IORING_FEAT_SUBMIT_STABLE (1U << 2) 284 #define IORING_FEAT_RW_CUR_POS (1U << 3) 285 #define IORING_FEAT_CUR_PERSONALITY (1U << 4) 286 #define IORING_FEAT_FAST_POLL (1U << 5) 287 #define IORING_FEAT_POLL_32BITS (1U << 6) 288 #define IORING_FEAT_SQPOLL_NONFIXED (1U << 7) 289 #define IORING_FEAT_EXT_ARG (1U << 8) 290 #define IORING_FEAT_NATIVE_WORKERS (1U << 9) 291 #define IORING_FEAT_RSRC_TAGS (1U << 10) 292 293 /* 294 * io_uring_register(2) opcodes and arguments 295 */ 296 enum { 297 IORING_REGISTER_BUFFERS = 0, 298 IORING_UNREGISTER_BUFFERS = 1, 299 IORING_REGISTER_FILES = 2, 300 IORING_UNREGISTER_FILES = 3, 301 IORING_REGISTER_EVENTFD = 4, 302 IORING_UNREGISTER_EVENTFD = 5, 303 IORING_REGISTER_FILES_UPDATE = 6, 304 IORING_REGISTER_EVENTFD_ASYNC = 7, 305 IORING_REGISTER_PROBE = 8, 306 IORING_REGISTER_PERSONALITY = 9, 307 IORING_UNREGISTER_PERSONALITY = 10, 308 IORING_REGISTER_RESTRICTIONS = 11, 309 IORING_REGISTER_ENABLE_RINGS = 12, 310 311 /* extended with tagging */ 312 IORING_REGISTER_FILES2 = 13, 313 IORING_REGISTER_FILES_UPDATE2 = 14, 314 IORING_REGISTER_BUFFERS2 = 15, 315 IORING_REGISTER_BUFFERS_UPDATE = 16, 316 317 /* this goes last */ 318 IORING_REGISTER_LAST 319 }; 320 321 /* deprecated, see struct io_uring_rsrc_update */ 322 struct io_uring_files_update { 323 __u32 offset; 324 __u32 resv; 325 __aligned_u64 /* __s32 * */ fds; 326 }; 327 328 struct io_uring_rsrc_register { 329 __u32 nr; 330 __u32 resv; 331 __u64 resv2; 332 __aligned_u64 data; 333 __aligned_u64 tags; 334 }; 335 336 struct io_uring_rsrc_update { 337 __u32 offset; 338 __u32 resv; 339 __aligned_u64 data; 340 }; 341 342 struct io_uring_rsrc_update2 { 343 __u32 offset; 344 __u32 resv; 345 __aligned_u64 data; 346 __aligned_u64 tags; 347 __u32 nr; 348 __u32 resv2; 349 }; 350 351 /* Skip updating fd indexes set to this value in the fd table */ 352 #define IORING_REGISTER_FILES_SKIP (-2) 353 354 #define IO_URING_OP_SUPPORTED (1U << 0) 355 356 struct io_uring_probe_op { 357 __u8 op; 358 __u8 resv; 359 __u16 flags; /* IO_URING_OP_* flags */ 360 __u32 resv2; 361 }; 362 363 struct io_uring_probe { 364 __u8 last_op; /* last opcode supported */ 365 __u8 ops_len; /* length of ops[] array below */ 366 __u16 resv; 367 __u32 resv2[3]; 368 struct io_uring_probe_op ops[]; 369 }; 370 371 struct io_uring_restriction { 372 __u16 opcode; 373 union { 374 __u8 register_op; /* IORING_RESTRICTION_REGISTER_OP */ 375 __u8 sqe_op; /* IORING_RESTRICTION_SQE_OP */ 376 __u8 sqe_flags; /* IORING_RESTRICTION_SQE_FLAGS_* */ 377 }; 378 __u8 resv; 379 __u32 resv2[3]; 380 }; 381 382 /* 383 * io_uring_restriction->opcode values 384 */ 385 enum { 386 /* Allow an io_uring_register(2) opcode */ 387 IORING_RESTRICTION_REGISTER_OP = 0, 388 389 /* Allow an sqe opcode */ 390 IORING_RESTRICTION_SQE_OP = 1, 391 392 /* Allow sqe flags */ 393 IORING_RESTRICTION_SQE_FLAGS_ALLOWED = 2, 394 395 /* Require sqe flags (these flags must be set on each submission) */ 396 IORING_RESTRICTION_SQE_FLAGS_REQUIRED = 3, 397 398 IORING_RESTRICTION_LAST 399 }; 400 401 struct io_uring_getevents_arg { 402 __u64 sigmask; 403 __u32 sigmask_sz; 404 __u32 pad; 405 __u64 ts; 406 }; 407 408 #ifdef __cplusplus 409 } 410 #endif 411 412 #endif 413