1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2011-2014, Intel Corporation. 4 * Copyright (c) 2017-2021 Christoph Hellwig. 5 */ 6 #include <linux/blk-integrity.h> 7 #include <linux/ptrace.h> /* for force_successful_syscall_return */ 8 #include <linux/nvme_ioctl.h> 9 #include <linux/io_uring/cmd.h> 10 #include "nvme.h" 11 12 enum { 13 NVME_IOCTL_VEC = (1 << 0), 14 NVME_IOCTL_PARTITION = (1 << 1), 15 }; 16 17 static bool nvme_cmd_allowed(struct nvme_ns *ns, struct nvme_command *c, 18 unsigned int flags, bool open_for_write) 19 { 20 u32 effects; 21 22 /* 23 * Do not allow unprivileged passthrough on partitions, as that allows an 24 * escape from the containment of the partition. 25 */ 26 if (flags & NVME_IOCTL_PARTITION) 27 goto admin; 28 29 /* 30 * Do not allow unprivileged processes to send vendor specific or fabrics 31 * commands as we can't be sure about their effects. 32 */ 33 if (c->common.opcode >= nvme_cmd_vendor_start || 34 c->common.opcode == nvme_fabrics_command) 35 goto admin; 36 37 /* 38 * Do not allow unprivileged passthrough of admin commands except 39 * for a subset of identify commands that contain information required 40 * to form proper I/O commands in userspace and do not expose any 41 * potentially sensitive information. 42 */ 43 if (!ns) { 44 if (c->common.opcode == nvme_admin_identify) { 45 switch (c->identify.cns) { 46 case NVME_ID_CNS_NS: 47 case NVME_ID_CNS_CS_NS: 48 case NVME_ID_CNS_NS_CS_INDEP: 49 case NVME_ID_CNS_CS_CTRL: 50 case NVME_ID_CNS_CTRL: 51 return true; 52 } 53 } 54 goto admin; 55 } 56 57 /* 58 * Check if the controller provides a Commands Supported and Effects log 59 * and marks this command as supported. If not reject unprivileged 60 * passthrough. 61 */ 62 effects = nvme_command_effects(ns->ctrl, ns, c->common.opcode); 63 if (!(effects & NVME_CMD_EFFECTS_CSUPP)) 64 goto admin; 65 66 /* 67 * Don't allow passthrough for command that have intrusive (or unknown) 68 * effects. 69 */ 70 if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | 71 NVME_CMD_EFFECTS_UUID_SEL | 72 NVME_CMD_EFFECTS_SCOPE_MASK)) 73 goto admin; 74 75 /* 76 * Only allow I/O commands that transfer data to the controller or that 77 * change the logical block contents if the file descriptor is open for 78 * writing. 79 */ 80 if ((nvme_is_write(c) || (effects & NVME_CMD_EFFECTS_LBCC)) && 81 !open_for_write) 82 goto admin; 83 84 return true; 85 admin: 86 return capable(CAP_SYS_ADMIN); 87 } 88 89 /* 90 * Convert integer values from ioctl structures to user pointers, silently 91 * ignoring the upper bits in the compat case to match behaviour of 32-bit 92 * kernels. 93 */ 94 static void __user *nvme_to_user_ptr(uintptr_t ptrval) 95 { 96 if (in_compat_syscall()) 97 ptrval = (compat_uptr_t)ptrval; 98 return (void __user *)ptrval; 99 } 100 101 static struct request *nvme_alloc_user_request(struct request_queue *q, 102 struct nvme_command *cmd, blk_opf_t rq_flags, 103 blk_mq_req_flags_t blk_flags) 104 { 105 struct request *req; 106 107 req = blk_mq_alloc_request(q, nvme_req_op(cmd) | rq_flags, blk_flags); 108 if (IS_ERR(req)) 109 return req; 110 nvme_init_request(req, cmd); 111 nvme_req(req)->flags |= NVME_REQ_USERCMD; 112 return req; 113 } 114 115 static int nvme_map_user_request(struct request *req, u64 ubuffer, 116 unsigned bufflen, void __user *meta_buffer, unsigned meta_len, 117 u32 meta_seed, struct io_uring_cmd *ioucmd, unsigned int flags) 118 { 119 struct request_queue *q = req->q; 120 struct nvme_ns *ns = q->queuedata; 121 struct block_device *bdev = ns ? ns->disk->part0 : NULL; 122 bool supports_metadata = bdev && blk_get_integrity(bdev->bd_disk); 123 bool has_metadata = meta_buffer && meta_len; 124 struct bio *bio = NULL; 125 int ret; 126 127 if (has_metadata && !supports_metadata) 128 return -EINVAL; 129 130 if (ioucmd && (ioucmd->flags & IORING_URING_CMD_FIXED)) { 131 struct iov_iter iter; 132 133 /* fixedbufs is only for non-vectored io */ 134 if (WARN_ON_ONCE(flags & NVME_IOCTL_VEC)) 135 return -EINVAL; 136 ret = io_uring_cmd_import_fixed(ubuffer, bufflen, 137 rq_data_dir(req), &iter, ioucmd); 138 if (ret < 0) 139 goto out; 140 ret = blk_rq_map_user_iov(q, req, NULL, &iter, GFP_KERNEL); 141 } else { 142 ret = blk_rq_map_user_io(req, NULL, nvme_to_user_ptr(ubuffer), 143 bufflen, GFP_KERNEL, flags & NVME_IOCTL_VEC, 0, 144 0, rq_data_dir(req)); 145 } 146 147 if (ret) 148 goto out; 149 150 bio = req->bio; 151 if (bdev) 152 bio_set_dev(bio, bdev); 153 154 if (has_metadata) { 155 ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len, 156 meta_seed); 157 if (ret) 158 goto out_unmap; 159 } 160 161 return ret; 162 163 out_unmap: 164 if (bio) 165 blk_rq_unmap_user(bio); 166 out: 167 blk_mq_free_request(req); 168 return ret; 169 } 170 171 static int nvme_submit_user_cmd(struct request_queue *q, 172 struct nvme_command *cmd, u64 ubuffer, unsigned bufflen, 173 void __user *meta_buffer, unsigned meta_len, u32 meta_seed, 174 u64 *result, unsigned timeout, unsigned int flags) 175 { 176 struct nvme_ns *ns = q->queuedata; 177 struct nvme_ctrl *ctrl; 178 struct request *req; 179 struct bio *bio; 180 u32 effects; 181 int ret; 182 183 req = nvme_alloc_user_request(q, cmd, 0, 0); 184 if (IS_ERR(req)) 185 return PTR_ERR(req); 186 187 req->timeout = timeout; 188 if (ubuffer && bufflen) { 189 ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer, 190 meta_len, meta_seed, NULL, flags); 191 if (ret) 192 return ret; 193 } 194 195 bio = req->bio; 196 ctrl = nvme_req(req)->ctrl; 197 198 effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode); 199 ret = nvme_execute_rq(req, false); 200 if (result) 201 *result = le64_to_cpu(nvme_req(req)->result.u64); 202 if (bio) 203 blk_rq_unmap_user(bio); 204 blk_mq_free_request(req); 205 206 if (effects) 207 nvme_passthru_end(ctrl, ns, effects, cmd, ret); 208 209 return ret; 210 } 211 212 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 213 { 214 struct nvme_user_io io; 215 struct nvme_command c; 216 unsigned length, meta_len; 217 void __user *metadata; 218 219 if (copy_from_user(&io, uio, sizeof(io))) 220 return -EFAULT; 221 if (io.flags) 222 return -EINVAL; 223 224 switch (io.opcode) { 225 case nvme_cmd_write: 226 case nvme_cmd_read: 227 case nvme_cmd_compare: 228 break; 229 default: 230 return -EINVAL; 231 } 232 233 length = (io.nblocks + 1) << ns->head->lba_shift; 234 235 if ((io.control & NVME_RW_PRINFO_PRACT) && 236 (ns->head->ms == ns->head->pi_size)) { 237 /* 238 * Protection information is stripped/inserted by the 239 * controller. 240 */ 241 if (nvme_to_user_ptr(io.metadata)) 242 return -EINVAL; 243 meta_len = 0; 244 metadata = NULL; 245 } else { 246 meta_len = (io.nblocks + 1) * ns->head->ms; 247 metadata = nvme_to_user_ptr(io.metadata); 248 } 249 250 if (ns->head->features & NVME_NS_EXT_LBAS) { 251 length += meta_len; 252 meta_len = 0; 253 } else if (meta_len) { 254 if ((io.metadata & 3) || !io.metadata) 255 return -EINVAL; 256 } 257 258 memset(&c, 0, sizeof(c)); 259 c.rw.opcode = io.opcode; 260 c.rw.flags = io.flags; 261 c.rw.nsid = cpu_to_le32(ns->head->ns_id); 262 c.rw.slba = cpu_to_le64(io.slba); 263 c.rw.length = cpu_to_le16(io.nblocks); 264 c.rw.control = cpu_to_le16(io.control); 265 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); 266 c.rw.reftag = cpu_to_le32(io.reftag); 267 c.rw.lbat = cpu_to_le16(io.apptag); 268 c.rw.lbatm = cpu_to_le16(io.appmask); 269 270 return nvme_submit_user_cmd(ns->queue, &c, io.addr, length, metadata, 271 meta_len, lower_32_bits(io.slba), NULL, 0, 0); 272 } 273 274 static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl, 275 struct nvme_ns *ns, __u32 nsid) 276 { 277 if (ns && nsid != ns->head->ns_id) { 278 dev_err(ctrl->device, 279 "%s: nsid (%u) in cmd does not match nsid (%u)" 280 "of namespace\n", 281 current->comm, nsid, ns->head->ns_id); 282 return false; 283 } 284 285 return true; 286 } 287 288 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 289 struct nvme_passthru_cmd __user *ucmd, unsigned int flags, 290 bool open_for_write) 291 { 292 struct nvme_passthru_cmd cmd; 293 struct nvme_command c; 294 unsigned timeout = 0; 295 u64 result; 296 int status; 297 298 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 299 return -EFAULT; 300 if (cmd.flags) 301 return -EINVAL; 302 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 303 return -EINVAL; 304 305 memset(&c, 0, sizeof(c)); 306 c.common.opcode = cmd.opcode; 307 c.common.flags = cmd.flags; 308 c.common.nsid = cpu_to_le32(cmd.nsid); 309 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 310 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 311 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 312 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 313 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 314 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 315 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 316 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 317 318 if (!nvme_cmd_allowed(ns, &c, 0, open_for_write)) 319 return -EACCES; 320 321 if (cmd.timeout_ms) 322 timeout = msecs_to_jiffies(cmd.timeout_ms); 323 324 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 325 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 326 cmd.metadata_len, 0, &result, timeout, 0); 327 328 if (status >= 0) { 329 if (put_user(result, &ucmd->result)) 330 return -EFAULT; 331 } 332 333 return status; 334 } 335 336 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 337 struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags, 338 bool open_for_write) 339 { 340 struct nvme_passthru_cmd64 cmd; 341 struct nvme_command c; 342 unsigned timeout = 0; 343 int status; 344 345 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 346 return -EFAULT; 347 if (cmd.flags) 348 return -EINVAL; 349 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 350 return -EINVAL; 351 352 memset(&c, 0, sizeof(c)); 353 c.common.opcode = cmd.opcode; 354 c.common.flags = cmd.flags; 355 c.common.nsid = cpu_to_le32(cmd.nsid); 356 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 357 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 358 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 359 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 360 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 361 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 362 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 363 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 364 365 if (!nvme_cmd_allowed(ns, &c, flags, open_for_write)) 366 return -EACCES; 367 368 if (cmd.timeout_ms) 369 timeout = msecs_to_jiffies(cmd.timeout_ms); 370 371 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 372 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 373 cmd.metadata_len, 0, &cmd.result, timeout, flags); 374 375 if (status >= 0) { 376 if (put_user(cmd.result, &ucmd->result)) 377 return -EFAULT; 378 } 379 380 return status; 381 } 382 383 struct nvme_uring_data { 384 __u64 metadata; 385 __u64 addr; 386 __u32 data_len; 387 __u32 metadata_len; 388 __u32 timeout_ms; 389 }; 390 391 /* 392 * This overlays struct io_uring_cmd pdu. 393 * Expect build errors if this grows larger than that. 394 */ 395 struct nvme_uring_cmd_pdu { 396 struct request *req; 397 struct bio *bio; 398 u64 result; 399 int status; 400 }; 401 402 static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu( 403 struct io_uring_cmd *ioucmd) 404 { 405 return (struct nvme_uring_cmd_pdu *)&ioucmd->pdu; 406 } 407 408 static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd, 409 unsigned issue_flags) 410 { 411 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 412 413 if (pdu->bio) 414 blk_rq_unmap_user(pdu->bio); 415 io_uring_cmd_done(ioucmd, pdu->status, pdu->result, issue_flags); 416 } 417 418 static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req, 419 blk_status_t err) 420 { 421 struct io_uring_cmd *ioucmd = req->end_io_data; 422 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 423 424 if (nvme_req(req)->flags & NVME_REQ_CANCELLED) 425 pdu->status = -EINTR; 426 else 427 pdu->status = nvme_req(req)->status; 428 pdu->result = le64_to_cpu(nvme_req(req)->result.u64); 429 430 /* 431 * For iopoll, complete it directly. Note that using the uring_cmd 432 * helper for this is safe only because we check blk_rq_is_poll(). 433 * As that returns false if we're NOT on a polled queue, then it's 434 * safe to use the polled completion helper. 435 * 436 * Otherwise, move the completion to task work. 437 */ 438 if (blk_rq_is_poll(req)) { 439 if (pdu->bio) 440 blk_rq_unmap_user(pdu->bio); 441 io_uring_cmd_iopoll_done(ioucmd, pdu->result, pdu->status); 442 } else { 443 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb); 444 } 445 446 return RQ_END_IO_FREE; 447 } 448 449 static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 450 struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec) 451 { 452 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 453 const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe); 454 struct request_queue *q = ns ? ns->queue : ctrl->admin_q; 455 struct nvme_uring_data d; 456 struct nvme_command c; 457 struct request *req; 458 blk_opf_t rq_flags = REQ_ALLOC_CACHE; 459 blk_mq_req_flags_t blk_flags = 0; 460 int ret; 461 462 c.common.opcode = READ_ONCE(cmd->opcode); 463 c.common.flags = READ_ONCE(cmd->flags); 464 if (c.common.flags) 465 return -EINVAL; 466 467 c.common.command_id = 0; 468 c.common.nsid = cpu_to_le32(cmd->nsid); 469 if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid))) 470 return -EINVAL; 471 472 c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2)); 473 c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3)); 474 c.common.metadata = 0; 475 c.common.dptr.prp1 = c.common.dptr.prp2 = 0; 476 c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10)); 477 c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11)); 478 c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12)); 479 c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13)); 480 c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14)); 481 c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15)); 482 483 if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE)) 484 return -EACCES; 485 486 d.metadata = READ_ONCE(cmd->metadata); 487 d.addr = READ_ONCE(cmd->addr); 488 d.data_len = READ_ONCE(cmd->data_len); 489 d.metadata_len = READ_ONCE(cmd->metadata_len); 490 d.timeout_ms = READ_ONCE(cmd->timeout_ms); 491 492 if (issue_flags & IO_URING_F_NONBLOCK) { 493 rq_flags |= REQ_NOWAIT; 494 blk_flags = BLK_MQ_REQ_NOWAIT; 495 } 496 if (issue_flags & IO_URING_F_IOPOLL) 497 rq_flags |= REQ_POLLED; 498 499 req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags); 500 if (IS_ERR(req)) 501 return PTR_ERR(req); 502 req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0; 503 504 if (d.addr && d.data_len) { 505 ret = nvme_map_user_request(req, d.addr, 506 d.data_len, nvme_to_user_ptr(d.metadata), 507 d.metadata_len, 0, ioucmd, vec); 508 if (ret) 509 return ret; 510 } 511 512 /* to free bio on completion, as req->bio will be null at that time */ 513 pdu->bio = req->bio; 514 pdu->req = req; 515 req->end_io_data = ioucmd; 516 req->end_io = nvme_uring_cmd_end_io; 517 blk_execute_rq_nowait(req, false); 518 return -EIOCBQUEUED; 519 } 520 521 static bool is_ctrl_ioctl(unsigned int cmd) 522 { 523 if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD) 524 return true; 525 if (is_sed_ioctl(cmd)) 526 return true; 527 return false; 528 } 529 530 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd, 531 void __user *argp, bool open_for_write) 532 { 533 switch (cmd) { 534 case NVME_IOCTL_ADMIN_CMD: 535 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 536 case NVME_IOCTL_ADMIN64_CMD: 537 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 538 default: 539 return sed_ioctl(ctrl->opal_dev, cmd, argp); 540 } 541 } 542 543 #ifdef COMPAT_FOR_U64_ALIGNMENT 544 struct nvme_user_io32 { 545 __u8 opcode; 546 __u8 flags; 547 __u16 control; 548 __u16 nblocks; 549 __u16 rsvd; 550 __u64 metadata; 551 __u64 addr; 552 __u64 slba; 553 __u32 dsmgmt; 554 __u32 reftag; 555 __u16 apptag; 556 __u16 appmask; 557 } __attribute__((__packed__)); 558 #define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32) 559 #endif /* COMPAT_FOR_U64_ALIGNMENT */ 560 561 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd, 562 void __user *argp, unsigned int flags, bool open_for_write) 563 { 564 switch (cmd) { 565 case NVME_IOCTL_ID: 566 force_successful_syscall_return(); 567 return ns->head->ns_id; 568 case NVME_IOCTL_IO_CMD: 569 return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write); 570 /* 571 * struct nvme_user_io can have different padding on some 32-bit ABIs. 572 * Just accept the compat version as all fields that are used are the 573 * same size and at the same offset. 574 */ 575 #ifdef COMPAT_FOR_U64_ALIGNMENT 576 case NVME_IOCTL_SUBMIT_IO32: 577 #endif 578 case NVME_IOCTL_SUBMIT_IO: 579 return nvme_submit_io(ns, argp); 580 case NVME_IOCTL_IO64_CMD_VEC: 581 flags |= NVME_IOCTL_VEC; 582 fallthrough; 583 case NVME_IOCTL_IO64_CMD: 584 return nvme_user_cmd64(ns->ctrl, ns, argp, flags, 585 open_for_write); 586 default: 587 return -ENOTTY; 588 } 589 } 590 591 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode, 592 unsigned int cmd, unsigned long arg) 593 { 594 struct nvme_ns *ns = bdev->bd_disk->private_data; 595 bool open_for_write = mode & BLK_OPEN_WRITE; 596 void __user *argp = (void __user *)arg; 597 unsigned int flags = 0; 598 599 if (bdev_is_partition(bdev)) 600 flags |= NVME_IOCTL_PARTITION; 601 602 if (is_ctrl_ioctl(cmd)) 603 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 604 return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 605 } 606 607 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 608 { 609 struct nvme_ns *ns = 610 container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev); 611 bool open_for_write = file->f_mode & FMODE_WRITE; 612 void __user *argp = (void __user *)arg; 613 614 if (is_ctrl_ioctl(cmd)) 615 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 616 return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 617 } 618 619 static int nvme_uring_cmd_checks(unsigned int issue_flags) 620 { 621 622 /* NVMe passthrough requires big SQE/CQE support */ 623 if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) != 624 (IO_URING_F_SQE128|IO_URING_F_CQE32)) 625 return -EOPNOTSUPP; 626 return 0; 627 } 628 629 static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd, 630 unsigned int issue_flags) 631 { 632 struct nvme_ctrl *ctrl = ns->ctrl; 633 int ret; 634 635 BUILD_BUG_ON(sizeof(struct nvme_uring_cmd_pdu) > sizeof(ioucmd->pdu)); 636 637 ret = nvme_uring_cmd_checks(issue_flags); 638 if (ret) 639 return ret; 640 641 switch (ioucmd->cmd_op) { 642 case NVME_URING_CMD_IO: 643 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false); 644 break; 645 case NVME_URING_CMD_IO_VEC: 646 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true); 647 break; 648 default: 649 ret = -ENOTTY; 650 } 651 652 return ret; 653 } 654 655 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 656 { 657 struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev, 658 struct nvme_ns, cdev); 659 660 return nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 661 } 662 663 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd, 664 struct io_comp_batch *iob, 665 unsigned int poll_flags) 666 { 667 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 668 struct request *req = pdu->req; 669 670 if (req && blk_rq_is_poll(req)) 671 return blk_rq_poll(req, iob, poll_flags); 672 return 0; 673 } 674 #ifdef CONFIG_NVME_MULTIPATH 675 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd, 676 void __user *argp, struct nvme_ns_head *head, int srcu_idx, 677 bool open_for_write) 678 __releases(&head->srcu) 679 { 680 struct nvme_ctrl *ctrl = ns->ctrl; 681 int ret; 682 683 nvme_get_ctrl(ns->ctrl); 684 srcu_read_unlock(&head->srcu, srcu_idx); 685 ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 686 687 nvme_put_ctrl(ctrl); 688 return ret; 689 } 690 691 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode, 692 unsigned int cmd, unsigned long arg) 693 { 694 struct nvme_ns_head *head = bdev->bd_disk->private_data; 695 bool open_for_write = mode & BLK_OPEN_WRITE; 696 void __user *argp = (void __user *)arg; 697 struct nvme_ns *ns; 698 int srcu_idx, ret = -EWOULDBLOCK; 699 unsigned int flags = 0; 700 701 if (bdev_is_partition(bdev)) 702 flags |= NVME_IOCTL_PARTITION; 703 704 srcu_idx = srcu_read_lock(&head->srcu); 705 ns = nvme_find_path(head); 706 if (!ns) 707 goto out_unlock; 708 709 /* 710 * Handle ioctls that apply to the controller instead of the namespace 711 * seperately and drop the ns SRCU reference early. This avoids a 712 * deadlock when deleting namespaces using the passthrough interface. 713 */ 714 if (is_ctrl_ioctl(cmd)) 715 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 716 open_for_write); 717 718 ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 719 out_unlock: 720 srcu_read_unlock(&head->srcu, srcu_idx); 721 return ret; 722 } 723 724 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, 725 unsigned long arg) 726 { 727 bool open_for_write = file->f_mode & FMODE_WRITE; 728 struct cdev *cdev = file_inode(file)->i_cdev; 729 struct nvme_ns_head *head = 730 container_of(cdev, struct nvme_ns_head, cdev); 731 void __user *argp = (void __user *)arg; 732 struct nvme_ns *ns; 733 int srcu_idx, ret = -EWOULDBLOCK; 734 735 srcu_idx = srcu_read_lock(&head->srcu); 736 ns = nvme_find_path(head); 737 if (!ns) 738 goto out_unlock; 739 740 if (is_ctrl_ioctl(cmd)) 741 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 742 open_for_write); 743 744 ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 745 out_unlock: 746 srcu_read_unlock(&head->srcu, srcu_idx); 747 return ret; 748 } 749 750 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, 751 unsigned int issue_flags) 752 { 753 struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; 754 struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); 755 int srcu_idx = srcu_read_lock(&head->srcu); 756 struct nvme_ns *ns = nvme_find_path(head); 757 int ret = -EINVAL; 758 759 if (ns) 760 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 761 srcu_read_unlock(&head->srcu, srcu_idx); 762 return ret; 763 } 764 #endif /* CONFIG_NVME_MULTIPATH */ 765 766 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 767 { 768 struct nvme_ctrl *ctrl = ioucmd->file->private_data; 769 int ret; 770 771 /* IOPOLL not supported yet */ 772 if (issue_flags & IO_URING_F_IOPOLL) 773 return -EOPNOTSUPP; 774 775 ret = nvme_uring_cmd_checks(issue_flags); 776 if (ret) 777 return ret; 778 779 switch (ioucmd->cmd_op) { 780 case NVME_URING_CMD_ADMIN: 781 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false); 782 break; 783 case NVME_URING_CMD_ADMIN_VEC: 784 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true); 785 break; 786 default: 787 ret = -ENOTTY; 788 } 789 790 return ret; 791 } 792 793 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp, 794 bool open_for_write) 795 { 796 struct nvme_ns *ns; 797 int ret, srcu_idx; 798 799 srcu_idx = srcu_read_lock(&ctrl->srcu); 800 if (list_empty(&ctrl->namespaces)) { 801 ret = -ENOTTY; 802 goto out_unlock; 803 } 804 805 ns = list_first_or_null_rcu(&ctrl->namespaces, struct nvme_ns, list); 806 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { 807 dev_warn(ctrl->device, 808 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); 809 ret = -EINVAL; 810 goto out_unlock; 811 } 812 813 dev_warn(ctrl->device, 814 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); 815 if (!nvme_get_ns(ns)) { 816 ret = -ENXIO; 817 goto out_unlock; 818 } 819 srcu_read_unlock(&ctrl->srcu, srcu_idx); 820 821 ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write); 822 nvme_put_ns(ns); 823 return ret; 824 825 out_unlock: 826 srcu_read_unlock(&ctrl->srcu, srcu_idx); 827 return ret; 828 } 829 830 long nvme_dev_ioctl(struct file *file, unsigned int cmd, 831 unsigned long arg) 832 { 833 bool open_for_write = file->f_mode & FMODE_WRITE; 834 struct nvme_ctrl *ctrl = file->private_data; 835 void __user *argp = (void __user *)arg; 836 837 switch (cmd) { 838 case NVME_IOCTL_ADMIN_CMD: 839 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 840 case NVME_IOCTL_ADMIN64_CMD: 841 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 842 case NVME_IOCTL_IO_CMD: 843 return nvme_dev_user_cmd(ctrl, argp, open_for_write); 844 case NVME_IOCTL_RESET: 845 if (!capable(CAP_SYS_ADMIN)) 846 return -EACCES; 847 dev_warn(ctrl->device, "resetting controller\n"); 848 return nvme_reset_ctrl_sync(ctrl); 849 case NVME_IOCTL_SUBSYS_RESET: 850 if (!capable(CAP_SYS_ADMIN)) 851 return -EACCES; 852 return nvme_reset_subsystem(ctrl); 853 case NVME_IOCTL_RESCAN: 854 if (!capable(CAP_SYS_ADMIN)) 855 return -EACCES; 856 nvme_queue_scan(ctrl); 857 return 0; 858 default: 859 return -ENOTTY; 860 } 861 } 862