scsi_sg.c revision 198708
1/*- 2 * Copyright (c) 2007 Scott Long 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 * without modification, immediately at the beginning of the file. 11 * 2. The name of the author may not be used to endorse or promote products 12 * derived from this software without specific prior written permission. 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 FOR 18 * 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/* 28 * scsi_sg peripheral driver. This driver is meant to implement the Linux 29 * SG passthrough interface for SCSI. 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_sg.c 198708 2009-10-31 10:43:38Z mav $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/kernel.h> 38#include <sys/types.h> 39#include <sys/bio.h> 40#include <sys/malloc.h> 41#include <sys/fcntl.h> 42#include <sys/ioccom.h> 43#include <sys/conf.h> 44#include <sys/errno.h> 45#include <sys/devicestat.h> 46#include <sys/proc.h> 47#include <sys/uio.h> 48 49#include <cam/cam.h> 50#include <cam/cam_ccb.h> 51#include <cam/cam_periph.h> 52#include <cam/cam_queue.h> 53#include <cam/cam_xpt_periph.h> 54#include <cam/cam_debug.h> 55#include <cam/cam_sim.h> 56 57#include <cam/scsi/scsi_all.h> 58#include <cam/scsi/scsi_message.h> 59#include <cam/scsi/scsi_sg.h> 60 61#include <compat/linux/linux_ioctl.h> 62 63typedef enum { 64 SG_FLAG_OPEN = 0x01, 65 SG_FLAG_LOCKED = 0x02, 66 SG_FLAG_INVALID = 0x04 67} sg_flags; 68 69typedef enum { 70 SG_STATE_NORMAL 71} sg_state; 72 73typedef enum { 74 SG_RDWR_FREE, 75 SG_RDWR_INPROG, 76 SG_RDWR_DONE 77} sg_rdwr_state; 78 79typedef enum { 80 SG_CCB_RDWR_IO, 81 SG_CCB_WAITING 82} sg_ccb_types; 83 84#define ccb_type ppriv_field0 85#define ccb_rdwr ppriv_ptr1 86 87struct sg_rdwr { 88 TAILQ_ENTRY(sg_rdwr) rdwr_link; 89 int tag; 90 int state; 91 int buf_len; 92 char *buf; 93 union ccb *ccb; 94 union { 95 struct sg_header hdr; 96 struct sg_io_hdr io_hdr; 97 } hdr; 98}; 99 100struct sg_softc { 101 sg_state state; 102 sg_flags flags; 103 struct devstat *device_stats; 104 TAILQ_HEAD(, sg_rdwr) rdwr_done; 105 struct cdev *dev; 106 int sg_timeout; 107 int sg_user_timeout; 108 uint8_t pd_type; 109 union ccb saved_ccb; 110}; 111 112static d_open_t sgopen; 113static d_close_t sgclose; 114static d_ioctl_t sgioctl; 115static d_write_t sgwrite; 116static d_read_t sgread; 117 118static periph_init_t sginit; 119static periph_ctor_t sgregister; 120static periph_oninv_t sgoninvalidate; 121static periph_dtor_t sgcleanup; 122static periph_start_t sgstart; 123static void sgasync(void *callback_arg, uint32_t code, 124 struct cam_path *path, void *arg); 125static void sgdone(struct cam_periph *periph, union ccb *done_ccb); 126static int sgsendccb(struct cam_periph *periph, union ccb *ccb); 127static int sgsendrdwr(struct cam_periph *periph, union ccb *ccb); 128static int sgerror(union ccb *ccb, uint32_t cam_flags, 129 uint32_t sense_flags); 130static void sg_scsiio_status(struct ccb_scsiio *csio, 131 u_short *hoststat, u_short *drvstat); 132 133static int scsi_group_len(u_char cmd); 134 135static struct periph_driver sgdriver = 136{ 137 sginit, "sg", 138 TAILQ_HEAD_INITIALIZER(sgdriver.units), /* gen */ 0 139}; 140PERIPHDRIVER_DECLARE(sg, sgdriver); 141 142static struct cdevsw sg_cdevsw = { 143 .d_version = D_VERSION, 144 .d_flags = D_NEEDGIANT, 145 .d_open = sgopen, 146 .d_close = sgclose, 147 .d_ioctl = sgioctl, 148 .d_write = sgwrite, 149 .d_read = sgread, 150 .d_name = "sg", 151}; 152 153static int sg_version = 30125; 154 155static void 156sginit(void) 157{ 158 cam_status status; 159 160 /* 161 * Install a global async callback. This callback will receive aync 162 * callbacks like "new device found". 163 */ 164 status = xpt_register_async(AC_FOUND_DEVICE, sgasync, NULL, NULL); 165 166 if (status != CAM_REQ_CMP) { 167 printf("sg: Failed to attach master async callbac " 168 "due to status 0x%x!\n", status); 169 } 170} 171 172static void 173sgoninvalidate(struct cam_periph *periph) 174{ 175 struct sg_softc *softc; 176 177 softc = (struct sg_softc *)periph->softc; 178 179 /* 180 * Deregister any async callbacks. 181 */ 182 xpt_register_async(0, sgasync, periph, periph->path); 183 184 softc->flags |= SG_FLAG_INVALID; 185 186 /* 187 * XXX Return all queued I/O with ENXIO. 188 * XXX Handle any transactions queued to the card 189 * with XPT_ABORT_CCB. 190 */ 191 192 if (bootverbose) { 193 xpt_print(periph->path, "lost device\n"); 194 } 195} 196 197static void 198sgcleanup(struct cam_periph *periph) 199{ 200 struct sg_softc *softc; 201 202 softc = (struct sg_softc *)periph->softc; 203 if (bootverbose) 204 xpt_print(periph->path, "removing device entry\n"); 205 devstat_remove_entry(softc->device_stats); 206 cam_periph_unlock(periph); 207 destroy_dev(softc->dev); 208 cam_periph_lock(periph); 209 free(softc, M_DEVBUF); 210} 211 212static void 213sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg) 214{ 215 struct cam_periph *periph; 216 217 periph = (struct cam_periph *)callback_arg; 218 219 switch (code) { 220 case AC_FOUND_DEVICE: 221 { 222 struct ccb_getdev *cgd; 223 cam_status status; 224 225 cgd = (struct ccb_getdev *)arg; 226 if (cgd == NULL) 227 break; 228 229 if (cgd->protocol != PROTO_SCSI) 230 break; 231 232 /* 233 * Allocate a peripheral instance for this device and 234 * start the probe process. 235 */ 236 status = cam_periph_alloc(sgregister, sgoninvalidate, 237 sgcleanup, sgstart, "sg", 238 CAM_PERIPH_BIO, cgd->ccb_h.path, 239 sgasync, AC_FOUND_DEVICE, cgd); 240 if ((status != CAM_REQ_CMP) && (status != CAM_REQ_INPROG)) { 241 const struct cam_status_entry *entry; 242 243 entry = cam_fetch_status_entry(status); 244 printf("sgasync: Unable to attach new device " 245 "due to status %#x: %s\n", status, entry ? 246 entry->status_text : "Unknown"); 247 } 248 break; 249 } 250 default: 251 cam_periph_async(periph, code, path, arg); 252 break; 253 } 254} 255 256static cam_status 257sgregister(struct cam_periph *periph, void *arg) 258{ 259 struct sg_softc *softc; 260 struct ccb_getdev *cgd; 261 int no_tags; 262 263 cgd = (struct ccb_getdev *)arg; 264 if (periph == NULL) { 265 printf("sgregister: periph was NULL!!\n"); 266 return (CAM_REQ_CMP_ERR); 267 } 268 269 if (cgd == NULL) { 270 printf("sgregister: no getdev CCB, can't register device\n"); 271 return (CAM_REQ_CMP_ERR); 272 } 273 274 softc = malloc(sizeof(*softc), M_DEVBUF, M_ZERO | M_NOWAIT); 275 if (softc == NULL) { 276 printf("sgregister: Unable to allocate softc\n"); 277 return (CAM_REQ_CMP_ERR); 278 } 279 280 softc->state = SG_STATE_NORMAL; 281 softc->pd_type = SID_TYPE(&cgd->inq_data); 282 softc->sg_timeout = SG_DEFAULT_TIMEOUT / SG_DEFAULT_HZ * hz; 283 softc->sg_user_timeout = SG_DEFAULT_TIMEOUT; 284 TAILQ_INIT(&softc->rdwr_done); 285 periph->softc = softc; 286 287 /* 288 * We pass in 0 for all blocksize, since we don't know what the 289 * blocksize of the device is, if it even has a blocksize. 290 */ 291 cam_periph_unlock(periph); 292 no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0; 293 softc->device_stats = devstat_new_entry("sg", 294 periph->unit_number, 0, 295 DEVSTAT_NO_BLOCKSIZE 296 | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0), 297 softc->pd_type | 298 DEVSTAT_TYPE_IF_SCSI | 299 DEVSTAT_TYPE_PASS, 300 DEVSTAT_PRIORITY_PASS); 301 302 /* Register the device */ 303 softc->dev = make_dev(&sg_cdevsw, periph->unit_number, 304 UID_ROOT, GID_OPERATOR, 0600, "%s%d", 305 periph->periph_name, periph->unit_number); 306 (void)make_dev_alias(softc->dev, "sg%c", 'a' + periph->unit_number); 307 cam_periph_lock(periph); 308 softc->dev->si_drv1 = periph; 309 310 /* 311 * Add as async callback so that we get 312 * notified if this device goes away. 313 */ 314 xpt_register_async(AC_LOST_DEVICE, sgasync, periph, periph->path); 315 316 if (bootverbose) 317 xpt_announce_periph(periph, NULL); 318 319 return (CAM_REQ_CMP); 320} 321 322static void 323sgstart(struct cam_periph *periph, union ccb *start_ccb) 324{ 325 struct sg_softc *softc; 326 327 softc = (struct sg_softc *)periph->softc; 328 329 switch (softc->state) { 330 case SG_STATE_NORMAL: 331 start_ccb->ccb_h.ccb_type = SG_CCB_WAITING; 332 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 333 periph_links.sle); 334 periph->immediate_priority = CAM_PRIORITY_NONE; 335 wakeup(&periph->ccb_list); 336 break; 337 } 338} 339 340static void 341sgdone(struct cam_periph *periph, union ccb *done_ccb) 342{ 343 struct sg_softc *softc; 344 struct ccb_scsiio *csio; 345 346 softc = (struct sg_softc *)periph->softc; 347 csio = &done_ccb->csio; 348 switch (csio->ccb_h.ccb_type) { 349 case SG_CCB_WAITING: 350 /* Caller will release the CCB */ 351 wakeup(&done_ccb->ccb_h.cbfcnp); 352 return; 353 case SG_CCB_RDWR_IO: 354 { 355 struct sg_rdwr *rdwr; 356 int state; 357 358 devstat_end_transaction(softc->device_stats, 359 csio->dxfer_len, 360 csio->tag_action & 0xf, 361 ((csio->ccb_h.flags & CAM_DIR_MASK) == 362 CAM_DIR_NONE) ? DEVSTAT_NO_DATA : 363 (csio->ccb_h.flags & CAM_DIR_OUT) ? 364 DEVSTAT_WRITE : DEVSTAT_READ, 365 NULL, NULL); 366 367 rdwr = done_ccb->ccb_h.ccb_rdwr; 368 state = rdwr->state; 369 rdwr->state = SG_RDWR_DONE; 370 wakeup(rdwr); 371 break; 372 } 373 default: 374 panic("unknown sg CCB type"); 375 } 376} 377 378static int 379sgopen(struct cdev *dev, int flags, int fmt, struct thread *td) 380{ 381 struct cam_periph *periph; 382 struct sg_softc *softc; 383 int error = 0; 384 385 periph = (struct cam_periph *)dev->si_drv1; 386 if (periph == NULL) 387 return (ENXIO); 388 389 /* 390 * Don't allow access when we're running at a high securelevel. 391 */ 392 error = securelevel_gt(td->td_ucred, 1); 393 if (error) 394 return (error); 395 396 cam_periph_lock(periph); 397 398 softc = (struct sg_softc *)periph->softc; 399 if (softc->flags & SG_FLAG_INVALID) { 400 cam_periph_unlock(periph); 401 return (ENXIO); 402 } 403 404 if ((softc->flags & SG_FLAG_OPEN) == 0) { 405 softc->flags |= SG_FLAG_OPEN; 406 cam_periph_unlock(periph); 407 } else { 408 /* Device closes aren't symmetrical, fix up the refcount. */ 409 cam_periph_unlock(periph); 410 cam_periph_release(periph); 411 } 412 413 return (error); 414} 415 416static int 417sgclose(struct cdev *dev, int flag, int fmt, struct thread *td) 418{ 419 struct cam_periph *periph; 420 struct sg_softc *softc; 421 422 periph = (struct cam_periph *)dev->si_drv1; 423 if (periph == NULL) 424 return (ENXIO); 425 426 cam_periph_lock(periph); 427 428 softc = (struct sg_softc *)periph->softc; 429 softc->flags &= ~SG_FLAG_OPEN; 430 431 cam_periph_unlock(periph); 432 cam_periph_release(periph); 433 434 return (0); 435} 436 437static int 438sgioctl(struct cdev *dev, u_long cmd, caddr_t arg, int flag, struct thread *td) 439{ 440 union ccb *ccb; 441 struct ccb_scsiio *csio; 442 struct cam_periph *periph; 443 struct sg_softc *softc; 444 struct sg_io_hdr req; 445 int dir, error; 446 447 periph = (struct cam_periph *)dev->si_drv1; 448 if (periph == NULL) 449 return (ENXIO); 450 451 cam_periph_lock(periph); 452 453 softc = (struct sg_softc *)periph->softc; 454 error = 0; 455 456 switch (cmd) { 457 case LINUX_SCSI_GET_BUS_NUMBER: { 458 int busno; 459 460 busno = xpt_path_path_id(periph->path); 461 error = copyout(&busno, arg, sizeof(busno)); 462 break; 463 } 464 case LINUX_SCSI_GET_IDLUN: { 465 struct scsi_idlun idlun; 466 struct cam_sim *sim; 467 468 idlun.dev_id = xpt_path_target_id(periph->path); 469 sim = xpt_path_sim(periph->path); 470 idlun.host_unique_id = sim->unit_number; 471 error = copyout(&idlun, arg, sizeof(idlun)); 472 break; 473 } 474 case SG_GET_VERSION_NUM: 475 case LINUX_SG_GET_VERSION_NUM: 476 error = copyout(&sg_version, arg, sizeof(sg_version)); 477 break; 478 case SG_SET_TIMEOUT: 479 case LINUX_SG_SET_TIMEOUT: { 480 u_int user_timeout; 481 482 error = copyin(arg, &user_timeout, sizeof(u_int)); 483 if (error == 0) { 484 softc->sg_user_timeout = user_timeout; 485 softc->sg_timeout = user_timeout / SG_DEFAULT_HZ * hz; 486 } 487 break; 488 } 489 case SG_GET_TIMEOUT: 490 case LINUX_SG_GET_TIMEOUT: 491 /* 492 * The value is returned directly to the syscall. 493 */ 494 td->td_retval[0] = softc->sg_user_timeout; 495 error = 0; 496 break; 497 case SG_IO: 498 case LINUX_SG_IO: 499 error = copyin(arg, &req, sizeof(req)); 500 if (error) 501 break; 502 503 if (req.cmd_len > IOCDBLEN) { 504 error = EINVAL; 505 break; 506 } 507 508 if (req.iovec_count != 0) { 509 error = EOPNOTSUPP; 510 break; 511 } 512 513 ccb = cam_periph_getccb(periph, CAM_PRIORITY_NORMAL); 514 csio = &ccb->csio; 515 516 error = copyin(req.cmdp, &csio->cdb_io.cdb_bytes, 517 req.cmd_len); 518 if (error) { 519 xpt_release_ccb(ccb); 520 break; 521 } 522 523 switch(req.dxfer_direction) { 524 case SG_DXFER_TO_DEV: 525 dir = CAM_DIR_OUT; 526 break; 527 case SG_DXFER_FROM_DEV: 528 dir = CAM_DIR_IN; 529 break; 530 case SG_DXFER_TO_FROM_DEV: 531 dir = CAM_DIR_IN | CAM_DIR_OUT; 532 break; 533 case SG_DXFER_NONE: 534 default: 535 dir = CAM_DIR_NONE; 536 break; 537 } 538 539 cam_fill_csio(csio, 540 /*retries*/1, 541 sgdone, 542 dir|CAM_DEV_QFRZDIS, 543 MSG_SIMPLE_Q_TAG, 544 req.dxferp, 545 req.dxfer_len, 546 req.mx_sb_len, 547 req.cmd_len, 548 req.timeout); 549 550 error = sgsendccb(periph, ccb); 551 if (error) { 552 req.host_status = DID_ERROR; 553 req.driver_status = DRIVER_INVALID; 554 xpt_release_ccb(ccb); 555 break; 556 } 557 558 req.status = csio->scsi_status; 559 req.masked_status = (csio->scsi_status >> 1) & 0x7f; 560 sg_scsiio_status(csio, &req.host_status, &req.driver_status); 561 req.resid = csio->resid; 562 req.duration = csio->ccb_h.timeout; 563 req.info = 0; 564 565 error = copyout(&req, arg, sizeof(req)); 566 if ((error == 0) && (csio->ccb_h.status & CAM_AUTOSNS_VALID) 567 && (req.sbp != NULL)) { 568 req.sb_len_wr = req.mx_sb_len - csio->sense_resid; 569 error = copyout(&csio->sense_data, req.sbp, 570 req.sb_len_wr); 571 } 572 573 xpt_release_ccb(ccb); 574 break; 575 576 case SG_GET_RESERVED_SIZE: 577 case LINUX_SG_GET_RESERVED_SIZE: { 578 int size = 32768; 579 580 error = copyout(&size, arg, sizeof(size)); 581 break; 582 } 583 584 case SG_GET_SCSI_ID: 585 case LINUX_SG_GET_SCSI_ID: 586 { 587 struct sg_scsi_id id; 588 589 id.host_no = 0; /* XXX */ 590 id.channel = xpt_path_path_id(periph->path); 591 id.scsi_id = xpt_path_target_id(periph->path); 592 id.lun = xpt_path_lun_id(periph->path); 593 id.scsi_type = softc->pd_type; 594 id.h_cmd_per_lun = 1; 595 id.d_queue_depth = 1; 596 id.unused[0] = 0; 597 id.unused[1] = 0; 598 599 error = copyout(&id, arg, sizeof(id)); 600 break; 601 } 602 603 case SG_EMULATED_HOST: 604 case SG_SET_TRANSFORM: 605 case SG_GET_TRANSFORM: 606 case SG_GET_NUM_WAITING: 607 case SG_SCSI_RESET: 608 case SG_GET_REQUEST_TABLE: 609 case SG_SET_KEEP_ORPHAN: 610 case SG_GET_KEEP_ORPHAN: 611 case SG_GET_ACCESS_COUNT: 612 case SG_SET_FORCE_LOW_DMA: 613 case SG_GET_LOW_DMA: 614 case SG_GET_SG_TABLESIZE: 615 case SG_SET_FORCE_PACK_ID: 616 case SG_GET_PACK_ID: 617 case SG_SET_RESERVED_SIZE: 618 case SG_GET_COMMAND_Q: 619 case SG_SET_COMMAND_Q: 620 case SG_SET_DEBUG: 621 case SG_NEXT_CMD_LEN: 622 case LINUX_SG_EMULATED_HOST: 623 case LINUX_SG_SET_TRANSFORM: 624 case LINUX_SG_GET_TRANSFORM: 625 case LINUX_SG_GET_NUM_WAITING: 626 case LINUX_SG_SCSI_RESET: 627 case LINUX_SG_GET_REQUEST_TABLE: 628 case LINUX_SG_SET_KEEP_ORPHAN: 629 case LINUX_SG_GET_KEEP_ORPHAN: 630 case LINUX_SG_GET_ACCESS_COUNT: 631 case LINUX_SG_SET_FORCE_LOW_DMA: 632 case LINUX_SG_GET_LOW_DMA: 633 case LINUX_SG_GET_SG_TABLESIZE: 634 case LINUX_SG_SET_FORCE_PACK_ID: 635 case LINUX_SG_GET_PACK_ID: 636 case LINUX_SG_SET_RESERVED_SIZE: 637 case LINUX_SG_GET_COMMAND_Q: 638 case LINUX_SG_SET_COMMAND_Q: 639 case LINUX_SG_SET_DEBUG: 640 case LINUX_SG_NEXT_CMD_LEN: 641 default: 642#ifdef CAMDEBUG 643 printf("sgioctl: rejecting cmd 0x%lx\n", cmd); 644#endif 645 error = ENODEV; 646 break; 647 } 648 649 cam_periph_unlock(periph); 650 return (error); 651} 652 653static int 654sgwrite(struct cdev *dev, struct uio *uio, int ioflag) 655{ 656 union ccb *ccb; 657 struct cam_periph *periph; 658 struct ccb_scsiio *csio; 659 struct sg_softc *sc; 660 struct sg_header *hdr; 661 struct sg_rdwr *rdwr; 662 u_char cdb_cmd; 663 char *buf; 664 int error = 0, cdb_len, buf_len, dir; 665 666 periph = dev->si_drv1; 667 rdwr = malloc(sizeof(*rdwr), M_DEVBUF, M_WAITOK | M_ZERO); 668 hdr = &rdwr->hdr.hdr; 669 670 /* Copy in the header block and sanity check it */ 671 if (uio->uio_resid < sizeof(*hdr)) { 672 error = EINVAL; 673 goto out_hdr; 674 } 675 error = uiomove(hdr, sizeof(*hdr), uio); 676 if (error) 677 goto out_hdr; 678 679 ccb = xpt_alloc_ccb(); 680 if (ccb == NULL) { 681 error = ENOMEM; 682 goto out_hdr; 683 } 684 csio = &ccb->csio; 685 686 /* 687 * Copy in the CDB block. The designers of the interface didn't 688 * bother to provide a size for this in the header, so we have to 689 * figure it out ourselves. 690 */ 691 if (uio->uio_resid < 1) 692 goto out_ccb; 693 error = uiomove(&cdb_cmd, 1, uio); 694 if (error) 695 goto out_ccb; 696 if (hdr->twelve_byte) 697 cdb_len = 12; 698 else 699 cdb_len = scsi_group_len(cdb_cmd); 700 /* 701 * We've already read the first byte of the CDB and advanced the uio 702 * pointer. Just read the rest. 703 */ 704 csio->cdb_io.cdb_bytes[0] = cdb_cmd; 705 error = uiomove(&csio->cdb_io.cdb_bytes[1], cdb_len - 1, uio); 706 if (error) 707 goto out_ccb; 708 709 /* 710 * Now set up the data block. Again, the designers didn't bother 711 * to make this reliable. 712 */ 713 buf_len = uio->uio_resid; 714 if (buf_len != 0) { 715 buf = malloc(buf_len, M_DEVBUF, M_WAITOK | M_ZERO); 716 error = uiomove(buf, buf_len, uio); 717 if (error) 718 goto out_buf; 719 dir = CAM_DIR_OUT; 720 } else if (hdr->reply_len != 0) { 721 buf = malloc(hdr->reply_len, M_DEVBUF, M_WAITOK | M_ZERO); 722 buf_len = hdr->reply_len; 723 dir = CAM_DIR_IN; 724 } else { 725 buf = NULL; 726 buf_len = 0; 727 dir = CAM_DIR_NONE; 728 } 729 730 cam_periph_lock(periph); 731 sc = periph->softc; 732 xpt_setup_ccb(&ccb->ccb_h, periph->path, CAM_PRIORITY_NORMAL); 733 cam_fill_csio(csio, 734 /*retries*/1, 735 sgdone, 736 dir|CAM_DEV_QFRZDIS, 737 MSG_SIMPLE_Q_TAG, 738 buf, 739 buf_len, 740 SG_MAX_SENSE, 741 cdb_len, 742 sc->sg_timeout); 743 744 /* 745 * Send off the command and hope that it works. This path does not 746 * go through sgstart because the I/O is supposed to be asynchronous. 747 */ 748 rdwr->buf = buf; 749 rdwr->buf_len = buf_len; 750 rdwr->tag = hdr->pack_id; 751 rdwr->ccb = ccb; 752 rdwr->state = SG_RDWR_INPROG; 753 ccb->ccb_h.ccb_rdwr = rdwr; 754 ccb->ccb_h.ccb_type = SG_CCB_RDWR_IO; 755 TAILQ_INSERT_TAIL(&sc->rdwr_done, rdwr, rdwr_link); 756 error = sgsendrdwr(periph, ccb); 757 cam_periph_unlock(periph); 758 return (error); 759 760out_buf: 761 free(buf, M_DEVBUF); 762out_ccb: 763 xpt_free_ccb(ccb); 764out_hdr: 765 free(rdwr, M_DEVBUF); 766 return (error); 767} 768 769static int 770sgread(struct cdev *dev, struct uio *uio, int ioflag) 771{ 772 struct ccb_scsiio *csio; 773 struct cam_periph *periph; 774 struct sg_softc *sc; 775 struct sg_header *hdr; 776 struct sg_rdwr *rdwr; 777 u_short hstat, dstat; 778 int error, pack_len, reply_len, pack_id; 779 780 periph = dev->si_drv1; 781 782 /* XXX The pack len field needs to be updated and written out instead 783 * of discarded. Not sure how to do that. 784 */ 785 uio->uio_rw = UIO_WRITE; 786 if ((error = uiomove(&pack_len, 4, uio)) != 0) 787 return (error); 788 if ((error = uiomove(&reply_len, 4, uio)) != 0) 789 return (error); 790 if ((error = uiomove(&pack_id, 4, uio)) != 0) 791 return (error); 792 uio->uio_rw = UIO_READ; 793 794 cam_periph_lock(periph); 795 sc = periph->softc; 796search: 797 TAILQ_FOREACH(rdwr, &sc->rdwr_done, rdwr_link) { 798 if (rdwr->tag == pack_id) 799 break; 800 } 801 if ((rdwr == NULL) || (rdwr->state != SG_RDWR_DONE)) { 802 if (msleep(rdwr, periph->sim->mtx, PCATCH, "sgread", 0) == ERESTART) 803 return (EAGAIN); 804 goto search; 805 } 806 TAILQ_REMOVE(&sc->rdwr_done, rdwr, rdwr_link); 807 cam_periph_unlock(periph); 808 809 hdr = &rdwr->hdr.hdr; 810 csio = &rdwr->ccb->csio; 811 sg_scsiio_status(csio, &hstat, &dstat); 812 hdr->host_status = hstat; 813 hdr->driver_status = dstat; 814 hdr->target_status = csio->scsi_status >> 1; 815 816 switch (hstat) { 817 case DID_OK: 818 case DID_PASSTHROUGH: 819 case DID_SOFT_ERROR: 820 hdr->result = 0; 821 break; 822 case DID_NO_CONNECT: 823 case DID_BUS_BUSY: 824 case DID_TIME_OUT: 825 hdr->result = EBUSY; 826 break; 827 case DID_BAD_TARGET: 828 case DID_ABORT: 829 case DID_PARITY: 830 case DID_RESET: 831 case DID_BAD_INTR: 832 case DID_ERROR: 833 default: 834 hdr->result = EIO; 835 break; 836 } 837 838 if (dstat == DRIVER_SENSE) { 839 bcopy(&csio->sense_data, hdr->sense_buffer, 840 min(csio->sense_len, SG_MAX_SENSE)); 841#ifdef CAMDEBUG 842 scsi_sense_print(csio); 843#endif 844 } 845 846 error = uiomove(&hdr->result, sizeof(*hdr) - 847 offsetof(struct sg_header, result), uio); 848 if ((error == 0) && (hdr->result == 0)) 849 error = uiomove(rdwr->buf, rdwr->buf_len, uio); 850 851 cam_periph_lock(periph); 852 xpt_free_ccb(rdwr->ccb); 853 cam_periph_unlock(periph); 854 free(rdwr->buf, M_DEVBUF); 855 free(rdwr, M_DEVBUF); 856 return (error); 857} 858 859static int 860sgsendccb(struct cam_periph *periph, union ccb *ccb) 861{ 862 struct sg_softc *softc; 863 struct cam_periph_map_info mapinfo; 864 int error, need_unmap = 0; 865 866 softc = periph->softc; 867 if (((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) 868 && (ccb->csio.data_ptr != NULL)) { 869 bzero(&mapinfo, sizeof(mapinfo)); 870 871 /* 872 * cam_periph_mapmem calls into proc and vm functions that can 873 * sleep as well as trigger I/O, so we can't hold the lock. 874 * Dropping it here is reasonably safe. 875 */ 876 cam_periph_unlock(periph); 877 error = cam_periph_mapmem(ccb, &mapinfo); 878 cam_periph_lock(periph); 879 if (error) 880 return (error); 881 need_unmap = 1; 882 } 883 884 error = cam_periph_runccb(ccb, 885 sgerror, 886 CAM_RETRY_SELTO, 887 SF_RETRY_UA, 888 softc->device_stats); 889 890 if (need_unmap) 891 cam_periph_unmapmem(ccb, &mapinfo); 892 893 return (error); 894} 895 896static int 897sgsendrdwr(struct cam_periph *periph, union ccb *ccb) 898{ 899 struct sg_softc *softc; 900 901 softc = periph->softc; 902 devstat_start_transaction(softc->device_stats, NULL); 903 xpt_action(ccb); 904 return (0); 905} 906 907static int 908sgerror(union ccb *ccb, uint32_t cam_flags, uint32_t sense_flags) 909{ 910 struct cam_periph *periph; 911 struct sg_softc *softc; 912 913 periph = xpt_path_periph(ccb->ccb_h.path); 914 softc = (struct sg_softc *)periph->softc; 915 916 return (cam_periph_error(ccb, cam_flags, sense_flags, 917 &softc->saved_ccb)); 918} 919 920static void 921sg_scsiio_status(struct ccb_scsiio *csio, u_short *hoststat, u_short *drvstat) 922{ 923 int status; 924 925 status = csio->ccb_h.status; 926 927 switch (status & CAM_STATUS_MASK) { 928 case CAM_REQ_CMP: 929 *hoststat = DID_OK; 930 *drvstat = 0; 931 break; 932 case CAM_REQ_CMP_ERR: 933 *hoststat = DID_ERROR; 934 *drvstat = 0; 935 break; 936 case CAM_REQ_ABORTED: 937 *hoststat = DID_ABORT; 938 *drvstat = 0; 939 break; 940 case CAM_REQ_INVALID: 941 *hoststat = DID_ERROR; 942 *drvstat = DRIVER_INVALID; 943 break; 944 case CAM_DEV_NOT_THERE: 945 *hoststat = DID_BAD_TARGET; 946 *drvstat = 0; 947 break; 948 case CAM_SEL_TIMEOUT: 949 *hoststat = DID_NO_CONNECT; 950 *drvstat = 0; 951 break; 952 case CAM_CMD_TIMEOUT: 953 *hoststat = DID_TIME_OUT; 954 *drvstat = 0; 955 break; 956 case CAM_SCSI_STATUS_ERROR: 957 *hoststat = DID_ERROR; 958 *drvstat = 0; 959 break; 960 case CAM_SCSI_BUS_RESET: 961 *hoststat = DID_RESET; 962 *drvstat = 0; 963 break; 964 case CAM_UNCOR_PARITY: 965 *hoststat = DID_PARITY; 966 *drvstat = 0; 967 break; 968 case CAM_SCSI_BUSY: 969 *hoststat = DID_BUS_BUSY; 970 *drvstat = 0; 971 break; 972 default: 973 *hoststat = DID_ERROR; 974 *drvstat = DRIVER_ERROR; 975 } 976 977 if (status & CAM_AUTOSNS_VALID) 978 *drvstat = DRIVER_SENSE; 979} 980 981static int 982scsi_group_len(u_char cmd) 983{ 984 int len[] = {6, 10, 10, 12, 12, 12, 10, 10}; 985 int group; 986 987 group = (cmd >> 5) & 0x7; 988 return (len[group]); 989} 990 991