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 struct iov_iter *iter, 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 struct nvme_ctrl *ctrl = nvme_req(req)->ctrl; 124 bool has_metadata = meta_buffer && meta_len; 125 struct bio *bio = NULL; 126 int ret; 127 128 if (!nvme_ctrl_sgl_supported(ctrl)) 129 dev_warn_once(ctrl->device, "using unchecked data buffer\n"); 130 if (has_metadata) { 131 if (!supports_metadata) 132 return -EINVAL; 133 134 if (!nvme_ctrl_meta_sgl_supported(ctrl)) 135 dev_warn_once(ctrl->device, 136 "using unchecked metadata buffer\n"); 137 } 138 139 if (iter) 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 if (ret) 146 return ret; 147 148 if (has_metadata) { 149 ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len); 150 if (ret) 151 goto out_unmap; 152 } 153 154 return ret; 155 156 out_unmap: 157 if (bio) 158 blk_rq_unmap_user(bio); 159 return ret; 160 } 161 162 static int nvme_submit_user_cmd(struct request_queue *q, 163 struct nvme_command *cmd, u64 ubuffer, unsigned bufflen, 164 void __user *meta_buffer, unsigned meta_len, 165 u64 *result, unsigned timeout, unsigned int flags) 166 { 167 struct nvme_ns *ns = q->queuedata; 168 struct nvme_ctrl *ctrl; 169 struct request *req; 170 struct bio *bio; 171 u32 effects; 172 int ret; 173 174 req = nvme_alloc_user_request(q, cmd, 0, 0); 175 if (IS_ERR(req)) 176 return PTR_ERR(req); 177 178 req->timeout = timeout; 179 if (ubuffer && bufflen) { 180 ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer, 181 meta_len, NULL, flags); 182 if (ret) 183 goto out_free_req; 184 } 185 186 bio = req->bio; 187 ctrl = nvme_req(req)->ctrl; 188 189 effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode); 190 ret = nvme_execute_rq(req, false); 191 if (result) 192 *result = le64_to_cpu(nvme_req(req)->result.u64); 193 if (bio) 194 blk_rq_unmap_user(bio); 195 blk_mq_free_request(req); 196 197 if (effects) 198 nvme_passthru_end(ctrl, ns, effects, cmd, ret); 199 return ret; 200 201 out_free_req: 202 blk_mq_free_request(req); 203 return ret; 204 } 205 206 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 207 { 208 struct nvme_user_io io; 209 struct nvme_command c; 210 unsigned length, meta_len; 211 void __user *metadata; 212 213 if (copy_from_user(&io, uio, sizeof(io))) 214 return -EFAULT; 215 if (io.flags) 216 return -EINVAL; 217 218 switch (io.opcode) { 219 case nvme_cmd_write: 220 case nvme_cmd_read: 221 case nvme_cmd_compare: 222 break; 223 default: 224 return -EINVAL; 225 } 226 227 length = (io.nblocks + 1) << ns->head->lba_shift; 228 229 if ((io.control & NVME_RW_PRINFO_PRACT) && 230 (ns->head->ms == ns->head->pi_size)) { 231 /* 232 * Protection information is stripped/inserted by the 233 * controller. 234 */ 235 if (nvme_to_user_ptr(io.metadata)) 236 return -EINVAL; 237 meta_len = 0; 238 metadata = NULL; 239 } else { 240 meta_len = (io.nblocks + 1) * ns->head->ms; 241 metadata = nvme_to_user_ptr(io.metadata); 242 } 243 244 if (ns->head->features & NVME_NS_EXT_LBAS) { 245 length += meta_len; 246 meta_len = 0; 247 } else if (meta_len) { 248 if ((io.metadata & 3) || !io.metadata) 249 return -EINVAL; 250 } 251 252 memset(&c, 0, sizeof(c)); 253 c.rw.opcode = io.opcode; 254 c.rw.flags = io.flags; 255 c.rw.nsid = cpu_to_le32(ns->head->ns_id); 256 c.rw.slba = cpu_to_le64(io.slba); 257 c.rw.length = cpu_to_le16(io.nblocks); 258 c.rw.control = cpu_to_le16(io.control); 259 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); 260 c.rw.reftag = cpu_to_le32(io.reftag); 261 c.rw.lbat = cpu_to_le16(io.apptag); 262 c.rw.lbatm = cpu_to_le16(io.appmask); 263 264 return nvme_submit_user_cmd(ns->queue, &c, io.addr, length, metadata, 265 meta_len, NULL, 0, 0); 266 } 267 268 static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl, 269 struct nvme_ns *ns, __u32 nsid) 270 { 271 if (ns && nsid != ns->head->ns_id) { 272 dev_err(ctrl->device, 273 "%s: nsid (%u) in cmd does not match nsid (%u) of namespace\n", 274 current->comm, nsid, ns->head->ns_id); 275 return false; 276 } 277 278 return true; 279 } 280 281 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 282 struct nvme_passthru_cmd __user *ucmd, unsigned int flags, 283 bool open_for_write) 284 { 285 struct nvme_passthru_cmd cmd; 286 struct nvme_command c; 287 unsigned timeout = 0; 288 u64 result; 289 int status; 290 291 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 292 return -EFAULT; 293 if (cmd.flags) 294 return -EINVAL; 295 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 296 return -EINVAL; 297 298 memset(&c, 0, sizeof(c)); 299 c.common.opcode = cmd.opcode; 300 c.common.flags = cmd.flags; 301 c.common.nsid = cpu_to_le32(cmd.nsid); 302 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 303 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 304 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 305 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 306 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 307 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 308 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 309 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 310 311 if (!nvme_cmd_allowed(ns, &c, 0, open_for_write)) 312 return -EACCES; 313 314 if (cmd.timeout_ms) 315 timeout = msecs_to_jiffies(cmd.timeout_ms); 316 317 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 318 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 319 cmd.metadata_len, &result, timeout, 0); 320 321 if (status >= 0) { 322 if (put_user(result, &ucmd->result)) 323 return -EFAULT; 324 } 325 326 return status; 327 } 328 329 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 330 struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags, 331 bool open_for_write) 332 { 333 struct nvme_passthru_cmd64 cmd; 334 struct nvme_command c; 335 unsigned timeout = 0; 336 int status; 337 338 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 339 return -EFAULT; 340 if (cmd.flags) 341 return -EINVAL; 342 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 343 return -EINVAL; 344 345 memset(&c, 0, sizeof(c)); 346 c.common.opcode = cmd.opcode; 347 c.common.flags = cmd.flags; 348 c.common.nsid = cpu_to_le32(cmd.nsid); 349 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 350 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 351 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 352 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 353 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 354 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 355 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 356 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 357 358 if (!nvme_cmd_allowed(ns, &c, flags, open_for_write)) 359 return -EACCES; 360 361 if (cmd.timeout_ms) 362 timeout = msecs_to_jiffies(cmd.timeout_ms); 363 364 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 365 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 366 cmd.metadata_len, &cmd.result, timeout, flags); 367 368 if (status >= 0) { 369 if (put_user(cmd.result, &ucmd->result)) 370 return -EFAULT; 371 } 372 373 return status; 374 } 375 376 struct nvme_uring_data { 377 __u64 metadata; 378 __u64 addr; 379 __u32 data_len; 380 __u32 metadata_len; 381 __u32 timeout_ms; 382 }; 383 384 /* 385 * This overlays struct io_uring_cmd pdu. 386 * Expect build errors if this grows larger than that. 387 */ 388 struct nvme_uring_cmd_pdu { 389 struct request *req; 390 struct bio *bio; 391 u64 result; 392 int status; 393 }; 394 395 static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu( 396 struct io_uring_cmd *ioucmd) 397 { 398 return io_uring_cmd_to_pdu(ioucmd, struct nvme_uring_cmd_pdu); 399 } 400 401 static void nvme_uring_task_cb(struct io_tw_req tw_req, io_tw_token_t tw) 402 { 403 struct io_uring_cmd *ioucmd = io_uring_cmd_from_tw(tw_req); 404 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 405 406 if (pdu->bio) 407 blk_rq_unmap_user(pdu->bio); 408 io_uring_cmd_done32(ioucmd, pdu->status, pdu->result, 409 IO_URING_CMD_TASK_WORK_ISSUE_FLAGS); 410 } 411 412 static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req, 413 blk_status_t err, 414 const struct io_comp_batch *iob) 415 { 416 struct io_uring_cmd *ioucmd = req->end_io_data; 417 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 418 419 if (nvme_req(req)->flags & NVME_REQ_CANCELLED) { 420 pdu->status = -EINTR; 421 } else { 422 pdu->status = nvme_req(req)->status; 423 if (!pdu->status) 424 pdu->status = blk_status_to_errno(err); 425 } 426 pdu->result = le64_to_cpu(nvme_req(req)->result.u64); 427 428 /* 429 * For IOPOLL, check if this completion is happening in the context 430 * of the same io_ring that owns the request (local context). If so, 431 * we can complete inline without task_work overhead. Otherwise, we 432 * must punt to task_work to ensure completion happens in the correct 433 * ring's context. 434 */ 435 if (blk_rq_is_poll(req) && iob && 436 iob->poll_ctx == io_uring_cmd_ctx_handle(ioucmd)) { 437 if (pdu->bio) 438 blk_rq_unmap_user(pdu->bio); 439 io_uring_cmd_done32(ioucmd, pdu->status, pdu->result, 0); 440 } else { 441 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb); 442 } 443 return RQ_END_IO_FREE; 444 } 445 446 static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 447 struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec) 448 { 449 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 450 const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe); 451 struct request_queue *q = ns ? ns->queue : ctrl->admin_q; 452 struct nvme_uring_data d; 453 struct nvme_command c; 454 struct iov_iter iter; 455 struct iov_iter *map_iter = NULL; 456 struct request *req; 457 blk_opf_t rq_flags = 0; 458 blk_mq_req_flags_t blk_flags = 0; 459 int ret; 460 461 c.common.opcode = READ_ONCE(cmd->opcode); 462 c.common.flags = READ_ONCE(cmd->flags); 463 if (c.common.flags) 464 return -EINVAL; 465 466 c.common.command_id = 0; 467 c.common.nsid = cpu_to_le32(cmd->nsid); 468 if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid))) 469 return -EINVAL; 470 471 c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2)); 472 c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3)); 473 c.common.metadata = 0; 474 c.common.dptr.prp1 = c.common.dptr.prp2 = 0; 475 c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10)); 476 c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11)); 477 c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12)); 478 c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13)); 479 c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14)); 480 c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15)); 481 482 if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE)) 483 return -EACCES; 484 485 d.metadata = READ_ONCE(cmd->metadata); 486 d.addr = READ_ONCE(cmd->addr); 487 d.data_len = READ_ONCE(cmd->data_len); 488 d.metadata_len = READ_ONCE(cmd->metadata_len); 489 d.timeout_ms = READ_ONCE(cmd->timeout_ms); 490 491 if (d.data_len && (ioucmd->flags & IORING_URING_CMD_FIXED)) { 492 int ddir = nvme_is_write(&c) ? WRITE : READ; 493 494 if (vec) 495 ret = io_uring_cmd_import_fixed_vec(ioucmd, 496 u64_to_user_ptr(d.addr), d.data_len, 497 ddir, &iter, issue_flags); 498 else 499 ret = io_uring_cmd_import_fixed(d.addr, d.data_len, 500 ddir, &iter, ioucmd, issue_flags); 501 if (ret < 0) 502 return ret; 503 504 map_iter = &iter; 505 } 506 507 if (issue_flags & IO_URING_F_NONBLOCK) { 508 rq_flags |= REQ_NOWAIT; 509 blk_flags = BLK_MQ_REQ_NOWAIT; 510 } 511 if (issue_flags & IO_URING_F_IOPOLL) 512 rq_flags |= REQ_POLLED; 513 514 req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags); 515 if (IS_ERR(req)) 516 return PTR_ERR(req); 517 req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0; 518 519 if (d.data_len) { 520 ret = nvme_map_user_request(req, d.addr, d.data_len, 521 nvme_to_user_ptr(d.metadata), d.metadata_len, 522 map_iter, vec ? NVME_IOCTL_VEC : 0); 523 if (ret) 524 goto out_free_req; 525 } 526 527 /* to free bio on completion, as req->bio will be null at that time */ 528 pdu->bio = req->bio; 529 pdu->req = req; 530 req->end_io_data = ioucmd; 531 req->end_io = nvme_uring_cmd_end_io; 532 blk_execute_rq_nowait(req, false); 533 return -EIOCBQUEUED; 534 535 out_free_req: 536 blk_mq_free_request(req); 537 return ret; 538 } 539 540 static bool is_ctrl_ioctl(unsigned int cmd) 541 { 542 if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD) 543 return true; 544 if (is_sed_ioctl(cmd)) 545 return true; 546 return false; 547 } 548 549 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd, 550 void __user *argp, bool open_for_write) 551 { 552 switch (cmd) { 553 case NVME_IOCTL_ADMIN_CMD: 554 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 555 case NVME_IOCTL_ADMIN64_CMD: 556 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 557 default: 558 return sed_ioctl(ctrl->opal_dev, cmd, argp); 559 } 560 } 561 562 #ifdef COMPAT_FOR_U64_ALIGNMENT 563 struct nvme_user_io32 { 564 __u8 opcode; 565 __u8 flags; 566 __u16 control; 567 __u16 nblocks; 568 __u16 rsvd; 569 __u64 metadata; 570 __u64 addr; 571 __u64 slba; 572 __u32 dsmgmt; 573 __u32 reftag; 574 __u16 apptag; 575 __u16 appmask; 576 } __attribute__((__packed__)); 577 #define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32) 578 #endif /* COMPAT_FOR_U64_ALIGNMENT */ 579 580 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd, 581 void __user *argp, unsigned int flags, bool open_for_write) 582 { 583 switch (cmd) { 584 case NVME_IOCTL_ID: 585 force_successful_syscall_return(); 586 return ns->head->ns_id; 587 case NVME_IOCTL_IO_CMD: 588 return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write); 589 /* 590 * struct nvme_user_io can have different padding on some 32-bit ABIs. 591 * Just accept the compat version as all fields that are used are the 592 * same size and at the same offset. 593 */ 594 #ifdef COMPAT_FOR_U64_ALIGNMENT 595 case NVME_IOCTL_SUBMIT_IO32: 596 #endif 597 case NVME_IOCTL_SUBMIT_IO: 598 return nvme_submit_io(ns, argp); 599 case NVME_IOCTL_IO64_CMD_VEC: 600 flags |= NVME_IOCTL_VEC; 601 fallthrough; 602 case NVME_IOCTL_IO64_CMD: 603 return nvme_user_cmd64(ns->ctrl, ns, argp, flags, 604 open_for_write); 605 default: 606 return -ENOTTY; 607 } 608 } 609 610 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode, 611 unsigned int cmd, unsigned long arg) 612 { 613 struct nvme_ns *ns = bdev->bd_disk->private_data; 614 bool open_for_write = mode & BLK_OPEN_WRITE; 615 void __user *argp = (void __user *)arg; 616 unsigned int flags = 0; 617 618 if (bdev_is_partition(bdev)) 619 flags |= NVME_IOCTL_PARTITION; 620 621 if (is_ctrl_ioctl(cmd)) 622 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 623 return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 624 } 625 626 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 627 { 628 struct nvme_ns *ns = 629 container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev); 630 bool open_for_write = file->f_mode & FMODE_WRITE; 631 void __user *argp = (void __user *)arg; 632 633 if (is_ctrl_ioctl(cmd)) 634 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 635 return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 636 } 637 638 static int nvme_uring_cmd_checks(unsigned int issue_flags) 639 { 640 641 /* NVMe passthrough requires big SQE/CQE support */ 642 if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) != 643 (IO_URING_F_SQE128|IO_URING_F_CQE32)) 644 return -EOPNOTSUPP; 645 return 0; 646 } 647 648 static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd, 649 unsigned int issue_flags) 650 { 651 struct nvme_ctrl *ctrl = ns->ctrl; 652 int ret; 653 654 ret = nvme_uring_cmd_checks(issue_flags); 655 if (ret) 656 return ret; 657 658 switch (ioucmd->cmd_op) { 659 case NVME_URING_CMD_IO: 660 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false); 661 break; 662 case NVME_URING_CMD_IO_VEC: 663 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true); 664 break; 665 default: 666 ret = -ENOTTY; 667 } 668 669 return ret; 670 } 671 672 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 673 { 674 struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev, 675 struct nvme_ns, cdev); 676 677 return nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 678 } 679 680 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd, 681 struct io_comp_batch *iob, 682 unsigned int poll_flags) 683 { 684 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 685 struct request *req = pdu->req; 686 687 if (req && blk_rq_is_poll(req)) 688 return blk_rq_poll(req, iob, poll_flags); 689 return 0; 690 } 691 #ifdef CONFIG_NVME_MULTIPATH 692 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd, 693 void __user *argp, struct nvme_ns_head *head, int srcu_idx, 694 bool open_for_write) 695 __releases(&head->srcu) 696 { 697 struct nvme_ctrl *ctrl = ns->ctrl; 698 int ret; 699 700 nvme_get_ctrl(ns->ctrl); 701 srcu_read_unlock(&head->srcu, srcu_idx); 702 ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 703 704 nvme_put_ctrl(ctrl); 705 return ret; 706 } 707 708 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode, 709 unsigned int cmd, unsigned long arg) 710 { 711 struct nvme_ns_head *head = bdev->bd_disk->private_data; 712 bool open_for_write = mode & BLK_OPEN_WRITE; 713 void __user *argp = (void __user *)arg; 714 struct nvme_ns *ns; 715 int srcu_idx, ret = -EWOULDBLOCK; 716 unsigned int flags = 0; 717 718 if (bdev_is_partition(bdev)) 719 flags |= NVME_IOCTL_PARTITION; 720 721 srcu_idx = srcu_read_lock(&head->srcu); 722 ns = nvme_find_path(head); 723 if (!ns) 724 goto out_unlock; 725 726 /* 727 * Handle ioctls that apply to the controller instead of the namespace 728 * separately and drop the ns SRCU reference early. This avoids a 729 * deadlock when deleting namespaces using the passthrough interface. 730 */ 731 if (is_ctrl_ioctl(cmd)) 732 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 733 open_for_write); 734 735 ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 736 out_unlock: 737 srcu_read_unlock(&head->srcu, srcu_idx); 738 return ret; 739 } 740 741 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, 742 unsigned long arg) 743 { 744 bool open_for_write = file->f_mode & FMODE_WRITE; 745 struct cdev *cdev = file_inode(file)->i_cdev; 746 struct nvme_ns_head *head = 747 container_of(cdev, struct nvme_ns_head, cdev); 748 void __user *argp = (void __user *)arg; 749 struct nvme_ns *ns; 750 int srcu_idx, ret = -EWOULDBLOCK; 751 752 srcu_idx = srcu_read_lock(&head->srcu); 753 ns = nvme_find_path(head); 754 if (!ns) 755 goto out_unlock; 756 757 if (is_ctrl_ioctl(cmd)) 758 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 759 open_for_write); 760 761 ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 762 out_unlock: 763 srcu_read_unlock(&head->srcu, srcu_idx); 764 return ret; 765 } 766 767 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, 768 unsigned int issue_flags) 769 { 770 struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; 771 struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); 772 int srcu_idx = srcu_read_lock(&head->srcu); 773 struct nvme_ns *ns = nvme_find_path(head); 774 int ret = -EINVAL; 775 776 if (ns) 777 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 778 srcu_read_unlock(&head->srcu, srcu_idx); 779 return ret; 780 } 781 #endif /* CONFIG_NVME_MULTIPATH */ 782 783 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 784 { 785 struct nvme_ctrl *ctrl = ioucmd->file->private_data; 786 int ret; 787 788 /* IOPOLL not supported yet */ 789 if (issue_flags & IO_URING_F_IOPOLL) 790 return -EOPNOTSUPP; 791 792 ret = nvme_uring_cmd_checks(issue_flags); 793 if (ret) 794 return ret; 795 796 switch (ioucmd->cmd_op) { 797 case NVME_URING_CMD_ADMIN: 798 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false); 799 break; 800 case NVME_URING_CMD_ADMIN_VEC: 801 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true); 802 break; 803 default: 804 ret = -ENOTTY; 805 } 806 807 return ret; 808 } 809 810 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp, 811 bool open_for_write) 812 { 813 struct nvme_ns *ns; 814 int ret, srcu_idx; 815 816 srcu_idx = srcu_read_lock(&ctrl->srcu); 817 if (list_empty(&ctrl->namespaces)) { 818 ret = -ENOTTY; 819 goto out_unlock; 820 } 821 822 ns = list_first_or_null_rcu(&ctrl->namespaces, struct nvme_ns, list); 823 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { 824 dev_warn(ctrl->device, 825 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); 826 ret = -EINVAL; 827 goto out_unlock; 828 } 829 830 dev_warn(ctrl->device, 831 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); 832 if (!nvme_get_ns(ns)) { 833 ret = -ENXIO; 834 goto out_unlock; 835 } 836 srcu_read_unlock(&ctrl->srcu, srcu_idx); 837 838 ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write); 839 nvme_put_ns(ns); 840 return ret; 841 842 out_unlock: 843 srcu_read_unlock(&ctrl->srcu, srcu_idx); 844 return ret; 845 } 846 847 long nvme_dev_ioctl(struct file *file, unsigned int cmd, 848 unsigned long arg) 849 { 850 bool open_for_write = file->f_mode & FMODE_WRITE; 851 struct nvme_ctrl *ctrl = file->private_data; 852 void __user *argp = (void __user *)arg; 853 854 switch (cmd) { 855 case NVME_IOCTL_ADMIN_CMD: 856 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 857 case NVME_IOCTL_ADMIN64_CMD: 858 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 859 case NVME_IOCTL_IO_CMD: 860 return nvme_dev_user_cmd(ctrl, argp, open_for_write); 861 case NVME_IOCTL_RESET: 862 if (!capable(CAP_SYS_ADMIN)) 863 return -EACCES; 864 dev_warn(ctrl->device, "resetting controller\n"); 865 return nvme_reset_ctrl_sync(ctrl); 866 case NVME_IOCTL_SUBSYS_RESET: 867 if (!capable(CAP_SYS_ADMIN)) 868 return -EACCES; 869 return nvme_reset_subsystem(ctrl); 870 case NVME_IOCTL_RESCAN: 871 if (!capable(CAP_SYS_ADMIN)) 872 return -EACCES; 873 nvme_queue_scan(ctrl); 874 return 0; 875 default: 876 return -ENOTTY; 877 } 878 } 879