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 { 415 struct io_uring_cmd *ioucmd = req->end_io_data; 416 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 417 418 if (nvme_req(req)->flags & NVME_REQ_CANCELLED) { 419 pdu->status = -EINTR; 420 } else { 421 pdu->status = nvme_req(req)->status; 422 if (!pdu->status) 423 pdu->status = blk_status_to_errno(err); 424 } 425 pdu->result = le64_to_cpu(nvme_req(req)->result.u64); 426 427 /* 428 * IOPOLL could potentially complete this request directly, but 429 * if multiple rings are polling on the same queue, then it's possible 430 * for one ring to find completions for another ring. Punting the 431 * completion via task_work will always direct it to the right 432 * location, rather than potentially complete requests for ringA 433 * under iopoll invocations from ringB. 434 */ 435 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb); 436 return RQ_END_IO_FREE; 437 } 438 439 static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 440 struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec) 441 { 442 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 443 const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe); 444 struct request_queue *q = ns ? ns->queue : ctrl->admin_q; 445 struct nvme_uring_data d; 446 struct nvme_command c; 447 struct iov_iter iter; 448 struct iov_iter *map_iter = NULL; 449 struct request *req; 450 blk_opf_t rq_flags = REQ_ALLOC_CACHE; 451 blk_mq_req_flags_t blk_flags = 0; 452 int ret; 453 454 c.common.opcode = READ_ONCE(cmd->opcode); 455 c.common.flags = READ_ONCE(cmd->flags); 456 if (c.common.flags) 457 return -EINVAL; 458 459 c.common.command_id = 0; 460 c.common.nsid = cpu_to_le32(cmd->nsid); 461 if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid))) 462 return -EINVAL; 463 464 c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2)); 465 c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3)); 466 c.common.metadata = 0; 467 c.common.dptr.prp1 = c.common.dptr.prp2 = 0; 468 c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10)); 469 c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11)); 470 c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12)); 471 c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13)); 472 c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14)); 473 c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15)); 474 475 if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE)) 476 return -EACCES; 477 478 d.metadata = READ_ONCE(cmd->metadata); 479 d.addr = READ_ONCE(cmd->addr); 480 d.data_len = READ_ONCE(cmd->data_len); 481 d.metadata_len = READ_ONCE(cmd->metadata_len); 482 d.timeout_ms = READ_ONCE(cmd->timeout_ms); 483 484 if (d.data_len && (ioucmd->flags & IORING_URING_CMD_FIXED)) { 485 int ddir = nvme_is_write(&c) ? WRITE : READ; 486 487 if (vec) 488 ret = io_uring_cmd_import_fixed_vec(ioucmd, 489 u64_to_user_ptr(d.addr), d.data_len, 490 ddir, &iter, issue_flags); 491 else 492 ret = io_uring_cmd_import_fixed(d.addr, d.data_len, 493 ddir, &iter, ioucmd, issue_flags); 494 if (ret < 0) 495 return ret; 496 497 map_iter = &iter; 498 } 499 500 if (issue_flags & IO_URING_F_NONBLOCK) { 501 rq_flags |= REQ_NOWAIT; 502 blk_flags = BLK_MQ_REQ_NOWAIT; 503 } 504 if (issue_flags & IO_URING_F_IOPOLL) 505 rq_flags |= REQ_POLLED; 506 507 req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags); 508 if (IS_ERR(req)) 509 return PTR_ERR(req); 510 req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0; 511 512 if (d.data_len) { 513 ret = nvme_map_user_request(req, d.addr, d.data_len, 514 nvme_to_user_ptr(d.metadata), d.metadata_len, 515 map_iter, vec ? NVME_IOCTL_VEC : 0); 516 if (ret) 517 goto out_free_req; 518 } 519 520 /* to free bio on completion, as req->bio will be null at that time */ 521 pdu->bio = req->bio; 522 pdu->req = req; 523 req->end_io_data = ioucmd; 524 req->end_io = nvme_uring_cmd_end_io; 525 blk_execute_rq_nowait(req, false); 526 return -EIOCBQUEUED; 527 528 out_free_req: 529 blk_mq_free_request(req); 530 return ret; 531 } 532 533 static bool is_ctrl_ioctl(unsigned int cmd) 534 { 535 if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD) 536 return true; 537 if (is_sed_ioctl(cmd)) 538 return true; 539 return false; 540 } 541 542 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd, 543 void __user *argp, bool open_for_write) 544 { 545 switch (cmd) { 546 case NVME_IOCTL_ADMIN_CMD: 547 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 548 case NVME_IOCTL_ADMIN64_CMD: 549 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 550 default: 551 return sed_ioctl(ctrl->opal_dev, cmd, argp); 552 } 553 } 554 555 #ifdef COMPAT_FOR_U64_ALIGNMENT 556 struct nvme_user_io32 { 557 __u8 opcode; 558 __u8 flags; 559 __u16 control; 560 __u16 nblocks; 561 __u16 rsvd; 562 __u64 metadata; 563 __u64 addr; 564 __u64 slba; 565 __u32 dsmgmt; 566 __u32 reftag; 567 __u16 apptag; 568 __u16 appmask; 569 } __attribute__((__packed__)); 570 #define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32) 571 #endif /* COMPAT_FOR_U64_ALIGNMENT */ 572 573 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd, 574 void __user *argp, unsigned int flags, bool open_for_write) 575 { 576 switch (cmd) { 577 case NVME_IOCTL_ID: 578 force_successful_syscall_return(); 579 return ns->head->ns_id; 580 case NVME_IOCTL_IO_CMD: 581 return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write); 582 /* 583 * struct nvme_user_io can have different padding on some 32-bit ABIs. 584 * Just accept the compat version as all fields that are used are the 585 * same size and at the same offset. 586 */ 587 #ifdef COMPAT_FOR_U64_ALIGNMENT 588 case NVME_IOCTL_SUBMIT_IO32: 589 #endif 590 case NVME_IOCTL_SUBMIT_IO: 591 return nvme_submit_io(ns, argp); 592 case NVME_IOCTL_IO64_CMD_VEC: 593 flags |= NVME_IOCTL_VEC; 594 fallthrough; 595 case NVME_IOCTL_IO64_CMD: 596 return nvme_user_cmd64(ns->ctrl, ns, argp, flags, 597 open_for_write); 598 default: 599 return -ENOTTY; 600 } 601 } 602 603 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode, 604 unsigned int cmd, unsigned long arg) 605 { 606 struct nvme_ns *ns = bdev->bd_disk->private_data; 607 bool open_for_write = mode & BLK_OPEN_WRITE; 608 void __user *argp = (void __user *)arg; 609 unsigned int flags = 0; 610 611 if (bdev_is_partition(bdev)) 612 flags |= NVME_IOCTL_PARTITION; 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, flags, open_for_write); 617 } 618 619 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 620 { 621 struct nvme_ns *ns = 622 container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev); 623 bool open_for_write = file->f_mode & FMODE_WRITE; 624 void __user *argp = (void __user *)arg; 625 626 if (is_ctrl_ioctl(cmd)) 627 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 628 return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 629 } 630 631 static int nvme_uring_cmd_checks(unsigned int issue_flags) 632 { 633 634 /* NVMe passthrough requires big SQE/CQE support */ 635 if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) != 636 (IO_URING_F_SQE128|IO_URING_F_CQE32)) 637 return -EOPNOTSUPP; 638 return 0; 639 } 640 641 static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd, 642 unsigned int issue_flags) 643 { 644 struct nvme_ctrl *ctrl = ns->ctrl; 645 int ret; 646 647 ret = nvme_uring_cmd_checks(issue_flags); 648 if (ret) 649 return ret; 650 651 switch (ioucmd->cmd_op) { 652 case NVME_URING_CMD_IO: 653 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false); 654 break; 655 case NVME_URING_CMD_IO_VEC: 656 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true); 657 break; 658 default: 659 ret = -ENOTTY; 660 } 661 662 return ret; 663 } 664 665 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 666 { 667 struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev, 668 struct nvme_ns, cdev); 669 670 return nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 671 } 672 673 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd, 674 struct io_comp_batch *iob, 675 unsigned int poll_flags) 676 { 677 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 678 struct request *req = pdu->req; 679 680 if (req && blk_rq_is_poll(req)) 681 return blk_rq_poll(req, iob, poll_flags); 682 return 0; 683 } 684 #ifdef CONFIG_NVME_MULTIPATH 685 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd, 686 void __user *argp, struct nvme_ns_head *head, int srcu_idx, 687 bool open_for_write) 688 __releases(&head->srcu) 689 { 690 struct nvme_ctrl *ctrl = ns->ctrl; 691 int ret; 692 693 nvme_get_ctrl(ns->ctrl); 694 srcu_read_unlock(&head->srcu, srcu_idx); 695 ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 696 697 nvme_put_ctrl(ctrl); 698 return ret; 699 } 700 701 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode, 702 unsigned int cmd, unsigned long arg) 703 { 704 struct nvme_ns_head *head = bdev->bd_disk->private_data; 705 bool open_for_write = mode & BLK_OPEN_WRITE; 706 void __user *argp = (void __user *)arg; 707 struct nvme_ns *ns; 708 int srcu_idx, ret = -EWOULDBLOCK; 709 unsigned int flags = 0; 710 711 if (bdev_is_partition(bdev)) 712 flags |= NVME_IOCTL_PARTITION; 713 714 srcu_idx = srcu_read_lock(&head->srcu); 715 ns = nvme_find_path(head); 716 if (!ns) 717 goto out_unlock; 718 719 /* 720 * Handle ioctls that apply to the controller instead of the namespace 721 * separately and drop the ns SRCU reference early. This avoids a 722 * deadlock when deleting namespaces using the passthrough interface. 723 */ 724 if (is_ctrl_ioctl(cmd)) 725 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 726 open_for_write); 727 728 ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 729 out_unlock: 730 srcu_read_unlock(&head->srcu, srcu_idx); 731 return ret; 732 } 733 734 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, 735 unsigned long arg) 736 { 737 bool open_for_write = file->f_mode & FMODE_WRITE; 738 struct cdev *cdev = file_inode(file)->i_cdev; 739 struct nvme_ns_head *head = 740 container_of(cdev, struct nvme_ns_head, cdev); 741 void __user *argp = (void __user *)arg; 742 struct nvme_ns *ns; 743 int srcu_idx, ret = -EWOULDBLOCK; 744 745 srcu_idx = srcu_read_lock(&head->srcu); 746 ns = nvme_find_path(head); 747 if (!ns) 748 goto out_unlock; 749 750 if (is_ctrl_ioctl(cmd)) 751 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 752 open_for_write); 753 754 ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 755 out_unlock: 756 srcu_read_unlock(&head->srcu, srcu_idx); 757 return ret; 758 } 759 760 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, 761 unsigned int issue_flags) 762 { 763 struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; 764 struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); 765 int srcu_idx = srcu_read_lock(&head->srcu); 766 struct nvme_ns *ns = nvme_find_path(head); 767 int ret = -EINVAL; 768 769 if (ns) 770 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 771 srcu_read_unlock(&head->srcu, srcu_idx); 772 return ret; 773 } 774 #endif /* CONFIG_NVME_MULTIPATH */ 775 776 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 777 { 778 struct nvme_ctrl *ctrl = ioucmd->file->private_data; 779 int ret; 780 781 /* IOPOLL not supported yet */ 782 if (issue_flags & IO_URING_F_IOPOLL) 783 return -EOPNOTSUPP; 784 785 ret = nvme_uring_cmd_checks(issue_flags); 786 if (ret) 787 return ret; 788 789 switch (ioucmd->cmd_op) { 790 case NVME_URING_CMD_ADMIN: 791 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false); 792 break; 793 case NVME_URING_CMD_ADMIN_VEC: 794 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true); 795 break; 796 default: 797 ret = -ENOTTY; 798 } 799 800 return ret; 801 } 802 803 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp, 804 bool open_for_write) 805 { 806 struct nvme_ns *ns; 807 int ret, srcu_idx; 808 809 srcu_idx = srcu_read_lock(&ctrl->srcu); 810 if (list_empty(&ctrl->namespaces)) { 811 ret = -ENOTTY; 812 goto out_unlock; 813 } 814 815 ns = list_first_or_null_rcu(&ctrl->namespaces, struct nvme_ns, list); 816 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { 817 dev_warn(ctrl->device, 818 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); 819 ret = -EINVAL; 820 goto out_unlock; 821 } 822 823 dev_warn(ctrl->device, 824 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); 825 if (!nvme_get_ns(ns)) { 826 ret = -ENXIO; 827 goto out_unlock; 828 } 829 srcu_read_unlock(&ctrl->srcu, srcu_idx); 830 831 ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write); 832 nvme_put_ns(ns); 833 return ret; 834 835 out_unlock: 836 srcu_read_unlock(&ctrl->srcu, srcu_idx); 837 return ret; 838 } 839 840 long nvme_dev_ioctl(struct file *file, unsigned int cmd, 841 unsigned long arg) 842 { 843 bool open_for_write = file->f_mode & FMODE_WRITE; 844 struct nvme_ctrl *ctrl = file->private_data; 845 void __user *argp = (void __user *)arg; 846 847 switch (cmd) { 848 case NVME_IOCTL_ADMIN_CMD: 849 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 850 case NVME_IOCTL_ADMIN64_CMD: 851 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 852 case NVME_IOCTL_IO_CMD: 853 return nvme_dev_user_cmd(ctrl, argp, open_for_write); 854 case NVME_IOCTL_RESET: 855 if (!capable(CAP_SYS_ADMIN)) 856 return -EACCES; 857 dev_warn(ctrl->device, "resetting controller\n"); 858 return nvme_reset_ctrl_sync(ctrl); 859 case NVME_IOCTL_SUBSYS_RESET: 860 if (!capable(CAP_SYS_ADMIN)) 861 return -EACCES; 862 return nvme_reset_subsystem(ctrl); 863 case NVME_IOCTL_RESCAN: 864 if (!capable(CAP_SYS_ADMIN)) 865 return -EACCES; 866 nvme_queue_scan(ctrl); 867 return 0; 868 default: 869 return -ENOTTY; 870 } 871 } 872