nvme_ns.c revision 256169
1/*- 2 * Copyright (C) 2012-2013 Intel Corporation 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/dev/nvme/nvme_ns.c 256169 2013-10-08 23:23:04Z jimharris $"); 29 30#include <sys/param.h> 31#include <sys/bio.h> 32#include <sys/bus.h> 33#include <sys/conf.h> 34#include <sys/disk.h> 35#include <sys/fcntl.h> 36#include <sys/ioccom.h> 37#include <sys/malloc.h> 38#include <sys/module.h> 39#include <sys/proc.h> 40#include <sys/systm.h> 41 42#include <dev/pci/pcivar.h> 43 44#include <geom/geom.h> 45 46#include "nvme_private.h" 47 48static void nvme_bio_child_inbed(struct bio *parent, int bio_error); 49static void nvme_bio_child_done(void *arg, 50 const struct nvme_completion *cpl); 51static uint32_t nvme_get_num_segments(uint64_t addr, uint64_t size, 52 uint32_t alignment); 53static void nvme_free_child_bios(int num_bios, 54 struct bio **child_bios); 55static struct bio ** nvme_allocate_child_bios(int num_bios); 56static struct bio ** nvme_construct_child_bios(struct bio *bp, 57 uint32_t alignment, 58 int *num_bios); 59static int nvme_ns_split_bio(struct nvme_namespace *ns, 60 struct bio *bp, 61 uint32_t alignment); 62 63static int 64nvme_ns_ioctl(struct cdev *cdev, u_long cmd, caddr_t arg, int flag, 65 struct thread *td) 66{ 67 struct nvme_namespace *ns; 68 struct nvme_controller *ctrlr; 69 struct nvme_pt_command *pt; 70 71 ns = cdev->si_drv1; 72 ctrlr = ns->ctrlr; 73 74 switch (cmd) { 75 case NVME_IO_TEST: 76 case NVME_BIO_TEST: 77 nvme_ns_test(ns, cmd, arg); 78 break; 79 case NVME_PASSTHROUGH_CMD: 80 pt = (struct nvme_pt_command *)arg; 81 return (nvme_ctrlr_passthrough_cmd(ctrlr, pt, ns->id, 82 1 /* is_user_buffer */, 0 /* is_admin_cmd */)); 83 case DIOCGMEDIASIZE: 84 *(off_t *)arg = (off_t)nvme_ns_get_size(ns); 85 break; 86 case DIOCGSECTORSIZE: 87 *(u_int *)arg = nvme_ns_get_sector_size(ns); 88 break; 89 default: 90 return (ENOTTY); 91 } 92 93 return (0); 94} 95 96static int 97nvme_ns_open(struct cdev *dev __unused, int flags, int fmt __unused, 98 struct thread *td) 99{ 100 int error = 0; 101 102 if (flags & FWRITE) 103 error = securelevel_gt(td->td_ucred, 0); 104 105 return (error); 106} 107 108static int 109nvme_ns_close(struct cdev *dev __unused, int flags, int fmt __unused, 110 struct thread *td) 111{ 112 113 return (0); 114} 115 116static void 117nvme_ns_strategy_done(void *arg, const struct nvme_completion *cpl) 118{ 119 struct bio *bp = arg; 120 121 /* 122 * TODO: add more extensive translation of NVMe status codes 123 * to different bio error codes (i.e. EIO, EINVAL, etc.) 124 */ 125 if (nvme_completion_is_error(cpl)) { 126 bp->bio_error = EIO; 127 bp->bio_flags |= BIO_ERROR; 128 bp->bio_resid = bp->bio_bcount; 129 } else 130 bp->bio_resid = 0; 131 132 biodone(bp); 133} 134 135static void 136nvme_ns_strategy(struct bio *bp) 137{ 138 struct nvme_namespace *ns; 139 int err; 140 141 ns = bp->bio_dev->si_drv1; 142 err = nvme_ns_bio_process(ns, bp, nvme_ns_strategy_done); 143 144 if (err) { 145 bp->bio_error = err; 146 bp->bio_flags |= BIO_ERROR; 147 bp->bio_resid = bp->bio_bcount; 148 biodone(bp); 149 } 150 151} 152 153static struct cdevsw nvme_ns_cdevsw = { 154 .d_version = D_VERSION, 155 .d_flags = D_DISK, 156 .d_read = physread, 157 .d_write = physwrite, 158 .d_open = nvme_ns_open, 159 .d_close = nvme_ns_close, 160 .d_strategy = nvme_ns_strategy, 161 .d_ioctl = nvme_ns_ioctl 162}; 163 164uint32_t 165nvme_ns_get_max_io_xfer_size(struct nvme_namespace *ns) 166{ 167 return ns->ctrlr->max_xfer_size; 168} 169 170uint32_t 171nvme_ns_get_sector_size(struct nvme_namespace *ns) 172{ 173 return (1 << ns->data.lbaf[ns->data.flbas.format].lbads); 174} 175 176uint64_t 177nvme_ns_get_num_sectors(struct nvme_namespace *ns) 178{ 179 return (ns->data.nsze); 180} 181 182uint64_t 183nvme_ns_get_size(struct nvme_namespace *ns) 184{ 185 return (nvme_ns_get_num_sectors(ns) * nvme_ns_get_sector_size(ns)); 186} 187 188uint32_t 189nvme_ns_get_flags(struct nvme_namespace *ns) 190{ 191 return (ns->flags); 192} 193 194const char * 195nvme_ns_get_serial_number(struct nvme_namespace *ns) 196{ 197 return ((const char *)ns->ctrlr->cdata.sn); 198} 199 200const char * 201nvme_ns_get_model_number(struct nvme_namespace *ns) 202{ 203 return ((const char *)ns->ctrlr->cdata.mn); 204} 205 206const struct nvme_namespace_data * 207nvme_ns_get_data(struct nvme_namespace *ns) 208{ 209 210 return (&ns->data); 211} 212 213static void 214nvme_ns_bio_done(void *arg, const struct nvme_completion *status) 215{ 216 struct bio *bp = arg; 217 nvme_cb_fn_t bp_cb_fn; 218 219 bp_cb_fn = bp->bio_driver1; 220 221 if (bp->bio_driver2) 222 free(bp->bio_driver2, M_NVME); 223 224 if (nvme_completion_is_error(status)) { 225 bp->bio_flags |= BIO_ERROR; 226 if (bp->bio_error == 0) 227 bp->bio_error = EIO; 228 } 229 230 if ((bp->bio_flags & BIO_ERROR) == 0) 231 bp->bio_resid = 0; 232 else 233 bp->bio_resid = bp->bio_bcount; 234 235 bp_cb_fn(bp, status); 236} 237 238static void 239nvme_bio_child_inbed(struct bio *parent, int bio_error) 240{ 241 struct nvme_completion parent_cpl; 242 int inbed; 243 244 if (bio_error != 0) { 245 parent->bio_flags |= BIO_ERROR; 246 parent->bio_error = bio_error; 247 } 248 249 /* 250 * atomic_fetchadd will return value before adding 1, so we still 251 * must add 1 to get the updated inbed number. 252 */ 253 inbed = atomic_fetchadd_int(&parent->bio_inbed, 1) + 1; 254 if (inbed == parent->bio_children) { 255 bzero(&parent_cpl, sizeof(parent_cpl)); 256 if (parent->bio_flags & BIO_ERROR) 257 parent_cpl.status.sc = NVME_SC_DATA_TRANSFER_ERROR; 258 nvme_ns_bio_done(parent, &parent_cpl); 259 } 260} 261 262static void 263nvme_bio_child_done(void *arg, const struct nvme_completion *cpl) 264{ 265 struct bio *child = arg; 266 struct bio *parent; 267 int bio_error; 268 269 parent = child->bio_parent; 270 g_destroy_bio(child); 271 bio_error = nvme_completion_is_error(cpl) ? EIO : 0; 272 nvme_bio_child_inbed(parent, bio_error); 273} 274 275static uint32_t 276nvme_get_num_segments(uint64_t addr, uint64_t size, uint32_t align) 277{ 278 uint32_t num_segs, offset, remainder; 279 280 if (align == 0) 281 return (1); 282 283 KASSERT((align & (align - 1)) == 0, ("alignment not power of 2\n")); 284 285 num_segs = size / align; 286 remainder = size & (align - 1); 287 offset = addr & (align - 1); 288 if (remainder > 0 || offset > 0) 289 num_segs += 1 + (remainder + offset - 1) / align; 290 return (num_segs); 291} 292 293static void 294nvme_free_child_bios(int num_bios, struct bio **child_bios) 295{ 296 int i; 297 298 for (i = 0; i < num_bios; i++) { 299 if (child_bios[i] != NULL) 300 g_destroy_bio(child_bios[i]); 301 } 302 303 free(child_bios, M_NVME); 304} 305 306static struct bio ** 307nvme_allocate_child_bios(int num_bios) 308{ 309 struct bio **child_bios; 310 int err = 0, i; 311 312 child_bios = malloc(num_bios * sizeof(struct bio *), M_NVME, M_NOWAIT); 313 if (child_bios == NULL) 314 return (NULL); 315 316 for (i = 0; i < num_bios; i++) { 317 child_bios[i] = g_new_bio(); 318 if (child_bios[i] == NULL) 319 err = ENOMEM; 320 } 321 322 if (err == ENOMEM) { 323 nvme_free_child_bios(num_bios, child_bios); 324 return (NULL); 325 } 326 327 return (child_bios); 328} 329 330static struct bio ** 331nvme_construct_child_bios(struct bio *bp, uint32_t alignment, int *num_bios) 332{ 333 struct bio **child_bios; 334 struct bio *child; 335 uint64_t cur_offset; 336 caddr_t data; 337 uint32_t rem_bcount; 338 int i; 339#ifdef NVME_UNMAPPED_BIO_SUPPORT 340 struct vm_page **ma; 341 uint32_t ma_offset; 342#endif 343 344 *num_bios = nvme_get_num_segments(bp->bio_offset, bp->bio_bcount, 345 alignment); 346 child_bios = nvme_allocate_child_bios(*num_bios); 347 if (child_bios == NULL) 348 return (NULL); 349 350 bp->bio_children = *num_bios; 351 bp->bio_inbed = 0; 352 cur_offset = bp->bio_offset; 353 rem_bcount = bp->bio_bcount; 354 data = bp->bio_data; 355#ifdef NVME_UNMAPPED_BIO_SUPPORT 356 ma_offset = bp->bio_ma_offset; 357 ma = bp->bio_ma; 358#endif 359 360 for (i = 0; i < *num_bios; i++) { 361 child = child_bios[i]; 362 child->bio_parent = bp; 363 child->bio_cmd = bp->bio_cmd; 364 child->bio_offset = cur_offset; 365 child->bio_bcount = min(rem_bcount, 366 alignment - (cur_offset & (alignment - 1))); 367 child->bio_flags = bp->bio_flags; 368#ifdef NVME_UNMAPPED_BIO_SUPPORT 369 if (bp->bio_flags & BIO_UNMAPPED) { 370 child->bio_ma_offset = ma_offset; 371 child->bio_ma = ma; 372 child->bio_ma_n = 373 nvme_get_num_segments(child->bio_ma_offset, 374 child->bio_bcount, PAGE_SIZE); 375 ma_offset = (ma_offset + child->bio_bcount) & 376 PAGE_MASK; 377 ma += child->bio_ma_n; 378 if (ma_offset != 0) 379 ma -= 1; 380 } else 381#endif 382 { 383 child->bio_data = data; 384 data += child->bio_bcount; 385 } 386 cur_offset += child->bio_bcount; 387 rem_bcount -= child->bio_bcount; 388 } 389 390 return (child_bios); 391} 392 393static int 394nvme_ns_split_bio(struct nvme_namespace *ns, struct bio *bp, 395 uint32_t alignment) 396{ 397 struct bio *child; 398 struct bio **child_bios; 399 int err, i, num_bios; 400 401 child_bios = nvme_construct_child_bios(bp, alignment, &num_bios); 402 if (child_bios == NULL) 403 return (ENOMEM); 404 405 for (i = 0; i < num_bios; i++) { 406 child = child_bios[i]; 407 err = nvme_ns_bio_process(ns, child, nvme_bio_child_done); 408 if (err != 0) { 409 nvme_bio_child_inbed(bp, err); 410 g_destroy_bio(child); 411 } 412 } 413 414 free(child_bios, M_NVME); 415 return (0); 416} 417 418int 419nvme_ns_bio_process(struct nvme_namespace *ns, struct bio *bp, 420 nvme_cb_fn_t cb_fn) 421{ 422 struct nvme_dsm_range *dsm_range; 423 uint32_t num_bios; 424 int err; 425 426 bp->bio_driver1 = cb_fn; 427 428 if (ns->stripesize > 0 && 429 (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) { 430 num_bios = nvme_get_num_segments(bp->bio_offset, 431 bp->bio_bcount, ns->stripesize); 432 if (num_bios > 1) 433 return (nvme_ns_split_bio(ns, bp, ns->stripesize)); 434 } 435 436 switch (bp->bio_cmd) { 437 case BIO_READ: 438 err = nvme_ns_cmd_read_bio(ns, bp, nvme_ns_bio_done, bp); 439 break; 440 case BIO_WRITE: 441 err = nvme_ns_cmd_write_bio(ns, bp, nvme_ns_bio_done, bp); 442 break; 443 case BIO_FLUSH: 444 err = nvme_ns_cmd_flush(ns, nvme_ns_bio_done, bp); 445 break; 446 case BIO_DELETE: 447 dsm_range = 448 malloc(sizeof(struct nvme_dsm_range), M_NVME, 449 M_ZERO | M_WAITOK); 450 dsm_range->length = 451 bp->bio_bcount/nvme_ns_get_sector_size(ns); 452 dsm_range->starting_lba = 453 bp->bio_offset/nvme_ns_get_sector_size(ns); 454 bp->bio_driver2 = dsm_range; 455 err = nvme_ns_cmd_deallocate(ns, dsm_range, 1, 456 nvme_ns_bio_done, bp); 457 if (err != 0) 458 free(dsm_range, M_NVME); 459 break; 460 default: 461 err = EIO; 462 break; 463 } 464 465 return (err); 466} 467 468#ifdef CHATHAM2 469static void 470nvme_ns_populate_chatham_data(struct nvme_namespace *ns) 471{ 472 struct nvme_controller *ctrlr; 473 struct nvme_namespace_data *nsdata; 474 475 ctrlr = ns->ctrlr; 476 nsdata = &ns->data; 477 478 nsdata->nsze = ctrlr->chatham_lbas; 479 nsdata->ncap = ctrlr->chatham_lbas; 480 nsdata->nuse = ctrlr->chatham_lbas; 481 482 /* Chatham2 doesn't support thin provisioning. */ 483 nsdata->nsfeat.thin_prov = 0; 484 485 /* Set LBA size to 512 bytes. */ 486 nsdata->lbaf[0].lbads = 9; 487} 488#endif /* CHATHAM2 */ 489 490int 491nvme_ns_construct(struct nvme_namespace *ns, uint16_t id, 492 struct nvme_controller *ctrlr) 493{ 494 struct nvme_completion_poll_status status; 495 496 ns->ctrlr = ctrlr; 497 ns->id = id; 498 ns->stripesize = 0; 499 500 if (pci_get_devid(ctrlr->dev) == 0x09538086 && ctrlr->cdata.vs[3] != 0) 501 ns->stripesize = 502 (1 << ctrlr->cdata.vs[3]) * ctrlr->min_page_size; 503 504 /* 505 * Namespaces are reconstructed after a controller reset, so check 506 * to make sure we only call mtx_init once on each mtx. 507 * 508 * TODO: Move this somewhere where it gets called at controller 509 * construction time, which is not invoked as part of each 510 * controller reset. 511 */ 512 if (!mtx_initialized(&ns->lock)) 513 mtx_init(&ns->lock, "nvme ns lock", NULL, MTX_DEF); 514 515#ifdef CHATHAM2 516 if (pci_get_devid(ctrlr->dev) == CHATHAM_PCI_ID) 517 nvme_ns_populate_chatham_data(ns); 518 else { 519#endif 520 status.done = FALSE; 521 nvme_ctrlr_cmd_identify_namespace(ctrlr, id, &ns->data, 522 nvme_completion_poll_cb, &status); 523 while (status.done == FALSE) 524 DELAY(5); 525 if (nvme_completion_is_error(&status.cpl)) { 526 nvme_printf(ctrlr, "nvme_identify_namespace failed\n"); 527 return (ENXIO); 528 } 529#ifdef CHATHAM2 530 } 531#endif 532 533 /* 534 * Note: format is a 0-based value, so > is appropriate here, 535 * not >=. 536 */ 537 if (ns->data.flbas.format > ns->data.nlbaf) { 538 printf("lba format %d exceeds number supported (%d)\n", 539 ns->data.flbas.format, ns->data.nlbaf+1); 540 return (1); 541 } 542 543 if (ctrlr->cdata.oncs.dsm) 544 ns->flags |= NVME_NS_DEALLOCATE_SUPPORTED; 545 546 if (ctrlr->cdata.vwc.present) 547 ns->flags |= NVME_NS_FLUSH_SUPPORTED; 548 549 /* 550 * cdev may have already been created, if we are reconstructing the 551 * namespace after a controller-level reset. 552 */ 553 if (ns->cdev != NULL) 554 return (0); 555 556/* 557 * MAKEDEV_ETERNAL was added in r210923, for cdevs that will never 558 * be destroyed. This avoids refcounting on the cdev object. 559 * That should be OK case here, as long as we're not supporting PCIe 560 * surprise removal nor namespace deletion. 561 */ 562#ifdef MAKEDEV_ETERNAL_KLD 563 ns->cdev = make_dev_credf(MAKEDEV_ETERNAL_KLD, &nvme_ns_cdevsw, 0, 564 NULL, UID_ROOT, GID_WHEEL, 0600, "nvme%dns%d", 565 device_get_unit(ctrlr->dev), ns->id); 566#else 567 ns->cdev = make_dev_credf(0, &nvme_ns_cdevsw, 0, 568 NULL, UID_ROOT, GID_WHEEL, 0600, "nvme%dns%d", 569 device_get_unit(ctrlr->dev), ns->id); 570#endif 571#ifdef NVME_UNMAPPED_BIO_SUPPORT 572 ns->cdev->si_flags |= SI_UNMAPPED; 573#endif 574 575 if (ns->cdev != NULL) 576 ns->cdev->si_drv1 = ns; 577 578 return (0); 579} 580 581void nvme_ns_destruct(struct nvme_namespace *ns) 582{ 583 584 if (ns->cdev != NULL) 585 destroy_dev(ns->cdev); 586} 587