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)); 145 146 if (ret) 147 return ret; 148 149 bio = req->bio; 150 if (bdev) 151 bio_set_dev(bio, bdev); 152 153 if (has_metadata) { 154 ret = blk_rq_integrity_map_user(req, meta_buffer, meta_len); 155 if (ret) 156 goto out_unmap; 157 } 158 159 return ret; 160 161 out_unmap: 162 if (bio) 163 blk_rq_unmap_user(bio); 164 return ret; 165 } 166 167 static int nvme_submit_user_cmd(struct request_queue *q, 168 struct nvme_command *cmd, u64 ubuffer, unsigned bufflen, 169 void __user *meta_buffer, unsigned meta_len, 170 u64 *result, unsigned timeout, unsigned int flags) 171 { 172 struct nvme_ns *ns = q->queuedata; 173 struct nvme_ctrl *ctrl; 174 struct request *req; 175 struct bio *bio; 176 u32 effects; 177 int ret; 178 179 req = nvme_alloc_user_request(q, cmd, 0, 0); 180 if (IS_ERR(req)) 181 return PTR_ERR(req); 182 183 req->timeout = timeout; 184 if (ubuffer && bufflen) { 185 ret = nvme_map_user_request(req, ubuffer, bufflen, meta_buffer, 186 meta_len, NULL, flags); 187 if (ret) 188 goto out_free_req; 189 } 190 191 bio = req->bio; 192 ctrl = nvme_req(req)->ctrl; 193 194 effects = nvme_passthru_start(ctrl, ns, cmd->common.opcode); 195 ret = nvme_execute_rq(req, false); 196 if (result) 197 *result = le64_to_cpu(nvme_req(req)->result.u64); 198 if (bio) 199 blk_rq_unmap_user(bio); 200 blk_mq_free_request(req); 201 202 if (effects) 203 nvme_passthru_end(ctrl, ns, effects, cmd, ret); 204 return ret; 205 206 out_free_req: 207 blk_mq_free_request(req); 208 return ret; 209 } 210 211 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) 212 { 213 struct nvme_user_io io; 214 struct nvme_command c; 215 unsigned length, meta_len; 216 void __user *metadata; 217 218 if (copy_from_user(&io, uio, sizeof(io))) 219 return -EFAULT; 220 if (io.flags) 221 return -EINVAL; 222 223 switch (io.opcode) { 224 case nvme_cmd_write: 225 case nvme_cmd_read: 226 case nvme_cmd_compare: 227 break; 228 default: 229 return -EINVAL; 230 } 231 232 length = (io.nblocks + 1) << ns->head->lba_shift; 233 234 if ((io.control & NVME_RW_PRINFO_PRACT) && 235 (ns->head->ms == ns->head->pi_size)) { 236 /* 237 * Protection information is stripped/inserted by the 238 * controller. 239 */ 240 if (nvme_to_user_ptr(io.metadata)) 241 return -EINVAL; 242 meta_len = 0; 243 metadata = NULL; 244 } else { 245 meta_len = (io.nblocks + 1) * ns->head->ms; 246 metadata = nvme_to_user_ptr(io.metadata); 247 } 248 249 if (ns->head->features & NVME_NS_EXT_LBAS) { 250 length += meta_len; 251 meta_len = 0; 252 } else if (meta_len) { 253 if ((io.metadata & 3) || !io.metadata) 254 return -EINVAL; 255 } 256 257 memset(&c, 0, sizeof(c)); 258 c.rw.opcode = io.opcode; 259 c.rw.flags = io.flags; 260 c.rw.nsid = cpu_to_le32(ns->head->ns_id); 261 c.rw.slba = cpu_to_le64(io.slba); 262 c.rw.length = cpu_to_le16(io.nblocks); 263 c.rw.control = cpu_to_le16(io.control); 264 c.rw.dsmgmt = cpu_to_le32(io.dsmgmt); 265 c.rw.reftag = cpu_to_le32(io.reftag); 266 c.rw.lbat = cpu_to_le16(io.apptag); 267 c.rw.lbatm = cpu_to_le16(io.appmask); 268 269 return nvme_submit_user_cmd(ns->queue, &c, io.addr, length, metadata, 270 meta_len, NULL, 0, 0); 271 } 272 273 static bool nvme_validate_passthru_nsid(struct nvme_ctrl *ctrl, 274 struct nvme_ns *ns, __u32 nsid) 275 { 276 if (ns && nsid != ns->head->ns_id) { 277 dev_err(ctrl->device, 278 "%s: nsid (%u) in cmd does not match nsid (%u) of namespace\n", 279 current->comm, nsid, ns->head->ns_id); 280 return false; 281 } 282 283 return true; 284 } 285 286 static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 287 struct nvme_passthru_cmd __user *ucmd, unsigned int flags, 288 bool open_for_write) 289 { 290 struct nvme_passthru_cmd cmd; 291 struct nvme_command c; 292 unsigned timeout = 0; 293 u64 result; 294 int status; 295 296 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 297 return -EFAULT; 298 if (cmd.flags) 299 return -EINVAL; 300 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 301 return -EINVAL; 302 303 memset(&c, 0, sizeof(c)); 304 c.common.opcode = cmd.opcode; 305 c.common.flags = cmd.flags; 306 c.common.nsid = cpu_to_le32(cmd.nsid); 307 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 308 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 309 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 310 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 311 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 312 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 313 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 314 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 315 316 if (!nvme_cmd_allowed(ns, &c, 0, open_for_write)) 317 return -EACCES; 318 319 if (cmd.timeout_ms) 320 timeout = msecs_to_jiffies(cmd.timeout_ms); 321 322 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 323 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 324 cmd.metadata_len, &result, timeout, 0); 325 326 if (status >= 0) { 327 if (put_user(result, &ucmd->result)) 328 return -EFAULT; 329 } 330 331 return status; 332 } 333 334 static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 335 struct nvme_passthru_cmd64 __user *ucmd, unsigned int flags, 336 bool open_for_write) 337 { 338 struct nvme_passthru_cmd64 cmd; 339 struct nvme_command c; 340 unsigned timeout = 0; 341 int status; 342 343 if (copy_from_user(&cmd, ucmd, sizeof(cmd))) 344 return -EFAULT; 345 if (cmd.flags) 346 return -EINVAL; 347 if (!nvme_validate_passthru_nsid(ctrl, ns, cmd.nsid)) 348 return -EINVAL; 349 350 memset(&c, 0, sizeof(c)); 351 c.common.opcode = cmd.opcode; 352 c.common.flags = cmd.flags; 353 c.common.nsid = cpu_to_le32(cmd.nsid); 354 c.common.cdw2[0] = cpu_to_le32(cmd.cdw2); 355 c.common.cdw2[1] = cpu_to_le32(cmd.cdw3); 356 c.common.cdw10 = cpu_to_le32(cmd.cdw10); 357 c.common.cdw11 = cpu_to_le32(cmd.cdw11); 358 c.common.cdw12 = cpu_to_le32(cmd.cdw12); 359 c.common.cdw13 = cpu_to_le32(cmd.cdw13); 360 c.common.cdw14 = cpu_to_le32(cmd.cdw14); 361 c.common.cdw15 = cpu_to_le32(cmd.cdw15); 362 363 if (!nvme_cmd_allowed(ns, &c, flags, open_for_write)) 364 return -EACCES; 365 366 if (cmd.timeout_ms) 367 timeout = msecs_to_jiffies(cmd.timeout_ms); 368 369 status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, 370 cmd.addr, cmd.data_len, nvme_to_user_ptr(cmd.metadata), 371 cmd.metadata_len, &cmd.result, timeout, flags); 372 373 if (status >= 0) { 374 if (put_user(cmd.result, &ucmd->result)) 375 return -EFAULT; 376 } 377 378 return status; 379 } 380 381 struct nvme_uring_data { 382 __u64 metadata; 383 __u64 addr; 384 __u32 data_len; 385 __u32 metadata_len; 386 __u32 timeout_ms; 387 }; 388 389 /* 390 * This overlays struct io_uring_cmd pdu. 391 * Expect build errors if this grows larger than that. 392 */ 393 struct nvme_uring_cmd_pdu { 394 struct request *req; 395 struct bio *bio; 396 u64 result; 397 int status; 398 }; 399 400 static inline struct nvme_uring_cmd_pdu *nvme_uring_cmd_pdu( 401 struct io_uring_cmd *ioucmd) 402 { 403 return io_uring_cmd_to_pdu(ioucmd, struct nvme_uring_cmd_pdu); 404 } 405 406 static void nvme_uring_task_cb(struct io_uring_cmd *ioucmd, 407 unsigned issue_flags) 408 { 409 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 410 411 if (pdu->bio) 412 blk_rq_unmap_user(pdu->bio); 413 io_uring_cmd_done(ioucmd, pdu->status, pdu->result, issue_flags); 414 } 415 416 static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req, 417 blk_status_t err) 418 { 419 struct io_uring_cmd *ioucmd = req->end_io_data; 420 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 421 422 if (nvme_req(req)->flags & NVME_REQ_CANCELLED) { 423 pdu->status = -EINTR; 424 } else { 425 pdu->status = nvme_req(req)->status; 426 if (!pdu->status) 427 pdu->status = blk_status_to_errno(err); 428 } 429 pdu->result = le64_to_cpu(nvme_req(req)->result.u64); 430 431 /* 432 * For iopoll, complete it directly. Note that using the uring_cmd 433 * helper for this is safe only because we check blk_rq_is_poll(). 434 * As that returns false if we're NOT on a polled queue, then it's 435 * safe to use the polled completion helper. 436 * 437 * Otherwise, move the completion to task work. 438 */ 439 if (blk_rq_is_poll(req)) { 440 if (pdu->bio) 441 blk_rq_unmap_user(pdu->bio); 442 io_uring_cmd_iopoll_done(ioucmd, pdu->result, pdu->status); 443 } else { 444 io_uring_cmd_do_in_task_lazy(ioucmd, nvme_uring_task_cb); 445 } 446 447 return RQ_END_IO_FREE; 448 } 449 450 static int nvme_uring_cmd_io(struct nvme_ctrl *ctrl, struct nvme_ns *ns, 451 struct io_uring_cmd *ioucmd, unsigned int issue_flags, bool vec) 452 { 453 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 454 const struct nvme_uring_cmd *cmd = io_uring_sqe_cmd(ioucmd->sqe); 455 struct request_queue *q = ns ? ns->queue : ctrl->admin_q; 456 struct nvme_uring_data d; 457 struct nvme_command c; 458 struct iov_iter iter; 459 struct iov_iter *map_iter = NULL; 460 struct request *req; 461 blk_opf_t rq_flags = REQ_ALLOC_CACHE; 462 blk_mq_req_flags_t blk_flags = 0; 463 int ret; 464 465 c.common.opcode = READ_ONCE(cmd->opcode); 466 c.common.flags = READ_ONCE(cmd->flags); 467 if (c.common.flags) 468 return -EINVAL; 469 470 c.common.command_id = 0; 471 c.common.nsid = cpu_to_le32(cmd->nsid); 472 if (!nvme_validate_passthru_nsid(ctrl, ns, le32_to_cpu(c.common.nsid))) 473 return -EINVAL; 474 475 c.common.cdw2[0] = cpu_to_le32(READ_ONCE(cmd->cdw2)); 476 c.common.cdw2[1] = cpu_to_le32(READ_ONCE(cmd->cdw3)); 477 c.common.metadata = 0; 478 c.common.dptr.prp1 = c.common.dptr.prp2 = 0; 479 c.common.cdw10 = cpu_to_le32(READ_ONCE(cmd->cdw10)); 480 c.common.cdw11 = cpu_to_le32(READ_ONCE(cmd->cdw11)); 481 c.common.cdw12 = cpu_to_le32(READ_ONCE(cmd->cdw12)); 482 c.common.cdw13 = cpu_to_le32(READ_ONCE(cmd->cdw13)); 483 c.common.cdw14 = cpu_to_le32(READ_ONCE(cmd->cdw14)); 484 c.common.cdw15 = cpu_to_le32(READ_ONCE(cmd->cdw15)); 485 486 if (!nvme_cmd_allowed(ns, &c, 0, ioucmd->file->f_mode & FMODE_WRITE)) 487 return -EACCES; 488 489 d.metadata = READ_ONCE(cmd->metadata); 490 d.addr = READ_ONCE(cmd->addr); 491 d.data_len = READ_ONCE(cmd->data_len); 492 d.metadata_len = READ_ONCE(cmd->metadata_len); 493 d.timeout_ms = READ_ONCE(cmd->timeout_ms); 494 495 if (d.data_len && (ioucmd->flags & IORING_URING_CMD_FIXED)) { 496 /* fixedbufs is only for non-vectored io */ 497 if (vec) 498 return -EINVAL; 499 500 ret = io_uring_cmd_import_fixed(d.addr, d.data_len, 501 nvme_is_write(&c) ? WRITE : READ, &iter, ioucmd, 502 issue_flags); 503 if (ret < 0) 504 return ret; 505 506 map_iter = &iter; 507 } 508 509 if (issue_flags & IO_URING_F_NONBLOCK) { 510 rq_flags |= REQ_NOWAIT; 511 blk_flags = BLK_MQ_REQ_NOWAIT; 512 } 513 if (issue_flags & IO_URING_F_IOPOLL) 514 rq_flags |= REQ_POLLED; 515 516 req = nvme_alloc_user_request(q, &c, rq_flags, blk_flags); 517 if (IS_ERR(req)) 518 return PTR_ERR(req); 519 req->timeout = d.timeout_ms ? msecs_to_jiffies(d.timeout_ms) : 0; 520 521 if (d.data_len) { 522 ret = nvme_map_user_request(req, d.addr, d.data_len, 523 nvme_to_user_ptr(d.metadata), d.metadata_len, 524 map_iter, vec); 525 if (ret) 526 goto out_free_req; 527 } 528 529 /* to free bio on completion, as req->bio will be null at that time */ 530 pdu->bio = req->bio; 531 pdu->req = req; 532 req->end_io_data = ioucmd; 533 req->end_io = nvme_uring_cmd_end_io; 534 blk_execute_rq_nowait(req, false); 535 return -EIOCBQUEUED; 536 537 out_free_req: 538 blk_mq_free_request(req); 539 return ret; 540 } 541 542 static bool is_ctrl_ioctl(unsigned int cmd) 543 { 544 if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD) 545 return true; 546 if (is_sed_ioctl(cmd)) 547 return true; 548 return false; 549 } 550 551 static int nvme_ctrl_ioctl(struct nvme_ctrl *ctrl, unsigned int cmd, 552 void __user *argp, bool open_for_write) 553 { 554 switch (cmd) { 555 case NVME_IOCTL_ADMIN_CMD: 556 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 557 case NVME_IOCTL_ADMIN64_CMD: 558 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 559 default: 560 return sed_ioctl(ctrl->opal_dev, cmd, argp); 561 } 562 } 563 564 #ifdef COMPAT_FOR_U64_ALIGNMENT 565 struct nvme_user_io32 { 566 __u8 opcode; 567 __u8 flags; 568 __u16 control; 569 __u16 nblocks; 570 __u16 rsvd; 571 __u64 metadata; 572 __u64 addr; 573 __u64 slba; 574 __u32 dsmgmt; 575 __u32 reftag; 576 __u16 apptag; 577 __u16 appmask; 578 } __attribute__((__packed__)); 579 #define NVME_IOCTL_SUBMIT_IO32 _IOW('N', 0x42, struct nvme_user_io32) 580 #endif /* COMPAT_FOR_U64_ALIGNMENT */ 581 582 static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned int cmd, 583 void __user *argp, unsigned int flags, bool open_for_write) 584 { 585 switch (cmd) { 586 case NVME_IOCTL_ID: 587 force_successful_syscall_return(); 588 return ns->head->ns_id; 589 case NVME_IOCTL_IO_CMD: 590 return nvme_user_cmd(ns->ctrl, ns, argp, flags, open_for_write); 591 /* 592 * struct nvme_user_io can have different padding on some 32-bit ABIs. 593 * Just accept the compat version as all fields that are used are the 594 * same size and at the same offset. 595 */ 596 #ifdef COMPAT_FOR_U64_ALIGNMENT 597 case NVME_IOCTL_SUBMIT_IO32: 598 #endif 599 case NVME_IOCTL_SUBMIT_IO: 600 return nvme_submit_io(ns, argp); 601 case NVME_IOCTL_IO64_CMD_VEC: 602 flags |= NVME_IOCTL_VEC; 603 fallthrough; 604 case NVME_IOCTL_IO64_CMD: 605 return nvme_user_cmd64(ns->ctrl, ns, argp, flags, 606 open_for_write); 607 default: 608 return -ENOTTY; 609 } 610 } 611 612 int nvme_ioctl(struct block_device *bdev, blk_mode_t mode, 613 unsigned int cmd, unsigned long arg) 614 { 615 struct nvme_ns *ns = bdev->bd_disk->private_data; 616 bool open_for_write = mode & BLK_OPEN_WRITE; 617 void __user *argp = (void __user *)arg; 618 unsigned int flags = 0; 619 620 if (bdev_is_partition(bdev)) 621 flags |= NVME_IOCTL_PARTITION; 622 623 if (is_ctrl_ioctl(cmd)) 624 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 625 return nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 626 } 627 628 long nvme_ns_chr_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 629 { 630 struct nvme_ns *ns = 631 container_of(file_inode(file)->i_cdev, struct nvme_ns, cdev); 632 bool open_for_write = file->f_mode & FMODE_WRITE; 633 void __user *argp = (void __user *)arg; 634 635 if (is_ctrl_ioctl(cmd)) 636 return nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 637 return nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 638 } 639 640 static int nvme_uring_cmd_checks(unsigned int issue_flags) 641 { 642 643 /* NVMe passthrough requires big SQE/CQE support */ 644 if ((issue_flags & (IO_URING_F_SQE128|IO_URING_F_CQE32)) != 645 (IO_URING_F_SQE128|IO_URING_F_CQE32)) 646 return -EOPNOTSUPP; 647 return 0; 648 } 649 650 static int nvme_ns_uring_cmd(struct nvme_ns *ns, struct io_uring_cmd *ioucmd, 651 unsigned int issue_flags) 652 { 653 struct nvme_ctrl *ctrl = ns->ctrl; 654 int ret; 655 656 ret = nvme_uring_cmd_checks(issue_flags); 657 if (ret) 658 return ret; 659 660 switch (ioucmd->cmd_op) { 661 case NVME_URING_CMD_IO: 662 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, false); 663 break; 664 case NVME_URING_CMD_IO_VEC: 665 ret = nvme_uring_cmd_io(ctrl, ns, ioucmd, issue_flags, true); 666 break; 667 default: 668 ret = -ENOTTY; 669 } 670 671 return ret; 672 } 673 674 int nvme_ns_chr_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 675 { 676 struct nvme_ns *ns = container_of(file_inode(ioucmd->file)->i_cdev, 677 struct nvme_ns, cdev); 678 679 return nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 680 } 681 682 int nvme_ns_chr_uring_cmd_iopoll(struct io_uring_cmd *ioucmd, 683 struct io_comp_batch *iob, 684 unsigned int poll_flags) 685 { 686 struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd); 687 struct request *req = pdu->req; 688 689 if (req && blk_rq_is_poll(req)) 690 return blk_rq_poll(req, iob, poll_flags); 691 return 0; 692 } 693 #ifdef CONFIG_NVME_MULTIPATH 694 static int nvme_ns_head_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd, 695 void __user *argp, struct nvme_ns_head *head, int srcu_idx, 696 bool open_for_write) 697 __releases(&head->srcu) 698 { 699 struct nvme_ctrl *ctrl = ns->ctrl; 700 int ret; 701 702 nvme_get_ctrl(ns->ctrl); 703 srcu_read_unlock(&head->srcu, srcu_idx); 704 ret = nvme_ctrl_ioctl(ns->ctrl, cmd, argp, open_for_write); 705 706 nvme_put_ctrl(ctrl); 707 return ret; 708 } 709 710 int nvme_ns_head_ioctl(struct block_device *bdev, blk_mode_t mode, 711 unsigned int cmd, unsigned long arg) 712 { 713 struct nvme_ns_head *head = bdev->bd_disk->private_data; 714 bool open_for_write = mode & BLK_OPEN_WRITE; 715 void __user *argp = (void __user *)arg; 716 struct nvme_ns *ns; 717 int srcu_idx, ret = -EWOULDBLOCK; 718 unsigned int flags = 0; 719 720 if (bdev_is_partition(bdev)) 721 flags |= NVME_IOCTL_PARTITION; 722 723 srcu_idx = srcu_read_lock(&head->srcu); 724 ns = nvme_find_path(head); 725 if (!ns) 726 goto out_unlock; 727 728 /* 729 * Handle ioctls that apply to the controller instead of the namespace 730 * seperately and drop the ns SRCU reference early. This avoids a 731 * deadlock when deleting namespaces using the passthrough interface. 732 */ 733 if (is_ctrl_ioctl(cmd)) 734 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 735 open_for_write); 736 737 ret = nvme_ns_ioctl(ns, cmd, argp, flags, open_for_write); 738 out_unlock: 739 srcu_read_unlock(&head->srcu, srcu_idx); 740 return ret; 741 } 742 743 long nvme_ns_head_chr_ioctl(struct file *file, unsigned int cmd, 744 unsigned long arg) 745 { 746 bool open_for_write = file->f_mode & FMODE_WRITE; 747 struct cdev *cdev = file_inode(file)->i_cdev; 748 struct nvme_ns_head *head = 749 container_of(cdev, struct nvme_ns_head, cdev); 750 void __user *argp = (void __user *)arg; 751 struct nvme_ns *ns; 752 int srcu_idx, ret = -EWOULDBLOCK; 753 754 srcu_idx = srcu_read_lock(&head->srcu); 755 ns = nvme_find_path(head); 756 if (!ns) 757 goto out_unlock; 758 759 if (is_ctrl_ioctl(cmd)) 760 return nvme_ns_head_ctrl_ioctl(ns, cmd, argp, head, srcu_idx, 761 open_for_write); 762 763 ret = nvme_ns_ioctl(ns, cmd, argp, 0, open_for_write); 764 out_unlock: 765 srcu_read_unlock(&head->srcu, srcu_idx); 766 return ret; 767 } 768 769 int nvme_ns_head_chr_uring_cmd(struct io_uring_cmd *ioucmd, 770 unsigned int issue_flags) 771 { 772 struct cdev *cdev = file_inode(ioucmd->file)->i_cdev; 773 struct nvme_ns_head *head = container_of(cdev, struct nvme_ns_head, cdev); 774 int srcu_idx = srcu_read_lock(&head->srcu); 775 struct nvme_ns *ns = nvme_find_path(head); 776 int ret = -EINVAL; 777 778 if (ns) 779 ret = nvme_ns_uring_cmd(ns, ioucmd, issue_flags); 780 srcu_read_unlock(&head->srcu, srcu_idx); 781 return ret; 782 } 783 #endif /* CONFIG_NVME_MULTIPATH */ 784 785 int nvme_dev_uring_cmd(struct io_uring_cmd *ioucmd, unsigned int issue_flags) 786 { 787 struct nvme_ctrl *ctrl = ioucmd->file->private_data; 788 int ret; 789 790 /* IOPOLL not supported yet */ 791 if (issue_flags & IO_URING_F_IOPOLL) 792 return -EOPNOTSUPP; 793 794 ret = nvme_uring_cmd_checks(issue_flags); 795 if (ret) 796 return ret; 797 798 switch (ioucmd->cmd_op) { 799 case NVME_URING_CMD_ADMIN: 800 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, false); 801 break; 802 case NVME_URING_CMD_ADMIN_VEC: 803 ret = nvme_uring_cmd_io(ctrl, NULL, ioucmd, issue_flags, true); 804 break; 805 default: 806 ret = -ENOTTY; 807 } 808 809 return ret; 810 } 811 812 static int nvme_dev_user_cmd(struct nvme_ctrl *ctrl, void __user *argp, 813 bool open_for_write) 814 { 815 struct nvme_ns *ns; 816 int ret, srcu_idx; 817 818 srcu_idx = srcu_read_lock(&ctrl->srcu); 819 if (list_empty(&ctrl->namespaces)) { 820 ret = -ENOTTY; 821 goto out_unlock; 822 } 823 824 ns = list_first_or_null_rcu(&ctrl->namespaces, struct nvme_ns, list); 825 if (ns != list_last_entry(&ctrl->namespaces, struct nvme_ns, list)) { 826 dev_warn(ctrl->device, 827 "NVME_IOCTL_IO_CMD not supported when multiple namespaces present!\n"); 828 ret = -EINVAL; 829 goto out_unlock; 830 } 831 832 dev_warn(ctrl->device, 833 "using deprecated NVME_IOCTL_IO_CMD ioctl on the char device!\n"); 834 if (!nvme_get_ns(ns)) { 835 ret = -ENXIO; 836 goto out_unlock; 837 } 838 srcu_read_unlock(&ctrl->srcu, srcu_idx); 839 840 ret = nvme_user_cmd(ctrl, ns, argp, 0, open_for_write); 841 nvme_put_ns(ns); 842 return ret; 843 844 out_unlock: 845 srcu_read_unlock(&ctrl->srcu, srcu_idx); 846 return ret; 847 } 848 849 long nvme_dev_ioctl(struct file *file, unsigned int cmd, 850 unsigned long arg) 851 { 852 bool open_for_write = file->f_mode & FMODE_WRITE; 853 struct nvme_ctrl *ctrl = file->private_data; 854 void __user *argp = (void __user *)arg; 855 856 switch (cmd) { 857 case NVME_IOCTL_ADMIN_CMD: 858 return nvme_user_cmd(ctrl, NULL, argp, 0, open_for_write); 859 case NVME_IOCTL_ADMIN64_CMD: 860 return nvme_user_cmd64(ctrl, NULL, argp, 0, open_for_write); 861 case NVME_IOCTL_IO_CMD: 862 return nvme_dev_user_cmd(ctrl, argp, open_for_write); 863 case NVME_IOCTL_RESET: 864 if (!capable(CAP_SYS_ADMIN)) 865 return -EACCES; 866 dev_warn(ctrl->device, "resetting controller\n"); 867 return nvme_reset_ctrl_sync(ctrl); 868 case NVME_IOCTL_SUBSYS_RESET: 869 if (!capable(CAP_SYS_ADMIN)) 870 return -EACCES; 871 return nvme_reset_subsystem(ctrl); 872 case NVME_IOCTL_RESCAN: 873 if (!capable(CAP_SYS_ADMIN)) 874 return -EACCES; 875 nvme_queue_scan(ctrl); 876 return 0; 877 default: 878 return -ENOTTY; 879 } 880 } 881