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/conf.h> 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/types.h> 37 #include <sys/bio.h> 38 #include <sys/malloc.h> 39 #include <sys/fcntl.h> 40 #include <sys/ioccom.h> 41 #include <sys/errno.h> 42 #include <sys/devicestat.h> 43 #include <sys/proc.h> 44 #include <sys/uio.h> 45 #include <sys/device.h> 46 #include <sys/sysmsg.h> 47 48 #include "../cam.h" 49 #include "../cam_ccb.h" 50 #include "../cam_periph.h" 51 #include "../cam_queue.h" 52 #include "../cam_xpt_periph.h" 53 #include "../cam_debug.h" 54 #include "../cam_sim.h" 55 56 #include <emulation/linux/linux_ioctl.h> 57 58 #include "scsi_all.h" 59 #include "scsi_message.h" 60 #include "scsi_sg.h" 61 62 typedef enum { 63 SG_FLAG_OPEN = 0x01, 64 SG_FLAG_LOCKED = 0x02, 65 SG_FLAG_INVALID = 0x04 66 } sg_flags; 67 68 typedef enum { 69 SG_STATE_NORMAL 70 } sg_state; 71 72 typedef enum { 73 SG_RDWR_FREE, 74 SG_RDWR_INPROG, 75 SG_RDWR_DONE 76 } sg_rdwr_state; 77 78 typedef enum { 79 SG_CCB_RDWR_IO, 80 SG_CCB_WAITING 81 } sg_ccb_types; 82 83 #define ccb_type ppriv_field0 84 #define ccb_rdwr ppriv_ptr1 85 86 struct sg_rdwr { 87 TAILQ_ENTRY(sg_rdwr) rdwr_link; 88 int tag; 89 int state; 90 int buf_len; 91 char *buf; 92 union ccb *ccb; 93 union { 94 struct sg_header hdr; 95 struct sg_io_hdr io_hdr; 96 } hdr; 97 }; 98 99 struct sg_softc { 100 sg_state state; 101 sg_flags flags; 102 struct devstat device_stats; 103 TAILQ_HEAD(, sg_rdwr) rdwr_done; 104 cdev_t dev; 105 int sg_timeout; 106 int sg_user_timeout; 107 uint8_t pd_type; 108 union ccb saved_ccb; 109 }; 110 111 static d_open_t sgopen; 112 static d_close_t sgclose; 113 static d_ioctl_t sgioctl; 114 static d_write_t sgwrite; 115 static d_read_t sgread; 116 117 static periph_init_t sginit; 118 static periph_ctor_t sgregister; 119 static periph_oninv_t sgoninvalidate; 120 static periph_dtor_t sgcleanup; 121 static periph_start_t sgstart; 122 static void sgasync(void *callback_arg, uint32_t code, 123 struct cam_path *path, void *arg); 124 static void sgdone(struct cam_periph *periph, union ccb *done_ccb); 125 static int sgsendccb(struct cam_periph *periph, union ccb *ccb); 126 static int sgsendrdwr(struct cam_periph *periph, union ccb *ccb); 127 static int sgerror(union ccb *ccb, uint32_t cam_flags, 128 uint32_t sense_flags); 129 static void sg_scsiio_status(struct ccb_scsiio *csio, 130 u_short *hoststat, u_short *drvstat); 131 132 static int scsi_group_len(u_char cmd); 133 134 static struct periph_driver sgdriver = 135 { 136 sginit, "sg", 137 TAILQ_HEAD_INITIALIZER(sgdriver.units), /* gen */ 0 138 }; 139 PERIPHDRIVER_DECLARE(sg, sgdriver); 140 141 static struct dev_ops sg_ops = { 142 { "sg", 0, D_DISK }, 143 .d_open = sgopen, 144 .d_close = sgclose, 145 .d_read = sgread, 146 .d_write = sgwrite, 147 .d_ioctl = sgioctl 148 }; 149 150 static int sg_version = 30125; 151 152 static void 153 sginit(void) 154 { 155 cam_status status; 156 157 /* 158 * Install a global async callback. This callback will receive aync 159 * callbacks like "new device found". 160 */ 161 status = xpt_register_async(AC_FOUND_DEVICE, sgasync, NULL, NULL); 162 163 if (status != CAM_REQ_CMP) { 164 kprintf("sg: Failed to attach master async callbac " 165 "due to status 0x%x!\n", status); 166 } 167 } 168 169 static void 170 sgoninvalidate(struct cam_periph *periph) 171 { 172 struct sg_softc *softc; 173 174 softc = (struct sg_softc *)periph->softc; 175 176 /* 177 * Deregister any async callbacks. 178 */ 179 xpt_register_async(0, sgasync, periph, periph->path); 180 181 softc->flags |= SG_FLAG_INVALID; 182 183 /* 184 * XXX Return all queued I/O with ENXIO. 185 * XXX Handle any transactions queued to the card 186 * with XPT_ABORT_CCB. 187 */ 188 189 if (bootverbose) { 190 xpt_print(periph->path, "lost device\n"); 191 } 192 } 193 194 static void 195 sgcleanup(struct cam_periph *periph) 196 { 197 struct sg_softc *softc; 198 199 softc = (struct sg_softc *)periph->softc; 200 if (bootverbose) 201 xpt_print(periph->path, "removing device entry\n"); 202 devstat_remove_entry(&softc->device_stats); 203 cam_periph_unlock(periph); 204 destroy_dev(softc->dev); 205 cam_periph_lock(periph); 206 kfree(softc, M_DEVBUF); 207 } 208 209 static void 210 sgasync(void *callback_arg, uint32_t code, struct cam_path *path, void *arg) 211 { 212 struct cam_periph *periph; 213 214 periph = (struct cam_periph *)callback_arg; 215 216 switch (code) { 217 case AC_FOUND_DEVICE: 218 { 219 struct ccb_getdev *cgd; 220 cam_status status; 221 222 cgd = (struct ccb_getdev *)arg; 223 if (cgd == NULL) 224 break; 225 226 #if 0 227 if (cgd->protocol != PROTO_SCSI) 228 break; 229 #endif 230 231 /* 232 * Allocate a peripheral instance for this device and 233 * start the probe process. 234 */ 235 status = cam_periph_alloc(sgregister, sgoninvalidate, 236 sgcleanup, sgstart, 237 "sg", CAM_PERIPH_BIO, cgd->ccb_h.path, 238 sgasync, AC_FOUND_DEVICE, cgd); 239 if ((status != CAM_REQ_CMP) && (status != CAM_REQ_INPROG)) { 240 const struct cam_status_entry *entry; 241 242 entry = cam_fetch_status_entry(status); 243 kprintf("sgasync: Unable to attach new device " 244 "due to status %#x: %s\n", status, entry ? 245 entry->status_text : "Unknown"); 246 } 247 break; 248 } 249 default: 250 cam_periph_async(periph, code, path, arg); 251 break; 252 } 253 } 254 255 static cam_status 256 sgregister(struct cam_periph *periph, void *arg) 257 { 258 struct sg_softc *softc; 259 struct ccb_getdev *cgd; 260 int no_tags; 261 262 cgd = (struct ccb_getdev *)arg; 263 if (periph == NULL) { 264 kprintf("sgregister: periph was NULL!!\n"); 265 return (CAM_REQ_CMP_ERR); 266 } 267 268 if (cgd == NULL) { 269 kprintf("sgregister: no getdev CCB, can't register device\n"); 270 return (CAM_REQ_CMP_ERR); 271 } 272 273 softc = kmalloc(sizeof(*softc), M_DEVBUF, M_WAITOK | M_ZERO); 274 softc->state = SG_STATE_NORMAL; 275 softc->pd_type = SID_TYPE(&cgd->inq_data); 276 softc->sg_timeout = SG_DEFAULT_TIMEOUT / SG_DEFAULT_HZ * hz; 277 softc->sg_user_timeout = SG_DEFAULT_TIMEOUT; 278 TAILQ_INIT(&softc->rdwr_done); 279 periph->softc = softc; 280 281 /* 282 * We pass in 0 for all blocksize, since we don't know what the 283 * blocksize of the device is, if it even has a blocksize. 284 */ 285 cam_periph_unlock(periph); 286 no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0; 287 devstat_add_entry(&softc->device_stats, "sg", 288 periph->unit_number, 0, 289 DEVSTAT_NO_BLOCKSIZE | 290 (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0), 291 softc->pd_type | 292 DEVSTAT_TYPE_IF_SCSI | DEVSTAT_PRIORITY_PASS, 293 DEVSTAT_PRIORITY_PASS); 294 295 /* Register the device */ 296 softc->dev = make_dev(&sg_ops, periph->unit_number, 297 UID_ROOT, GID_OPERATOR, 0600, "%s%d", 298 periph->periph_name, periph->unit_number); 299 make_dev_alias(softc->dev, "sg%c", 'a' + periph->unit_number); 300 cam_periph_lock(periph); 301 softc->dev->si_drv1 = periph; 302 303 /* 304 * Add as async callback so that we get 305 * notified if this device goes away. 306 */ 307 xpt_register_async(AC_LOST_DEVICE, sgasync, periph, periph->path); 308 309 if (bootverbose) 310 xpt_announce_periph(periph, NULL); 311 312 return (CAM_REQ_CMP); 313 } 314 315 static void 316 sgstart(struct cam_periph *periph, union ccb *start_ccb) 317 { 318 struct sg_softc *softc; 319 320 softc = (struct sg_softc *)periph->softc; 321 322 switch (softc->state) { 323 case SG_STATE_NORMAL: 324 start_ccb->ccb_h.ccb_type = SG_CCB_WAITING; 325 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 326 periph_links.sle); 327 periph->immediate_priority = CAM_PRIORITY_NONE; 328 wakeup(&periph->ccb_list); 329 break; 330 } 331 } 332 333 static void 334 sgdone(struct cam_periph *periph, union ccb *done_ccb) 335 { 336 struct sg_softc *softc; 337 struct ccb_scsiio *csio; 338 339 softc = (struct sg_softc *)periph->softc; 340 csio = &done_ccb->csio; 341 switch (csio->ccb_h.ccb_type) { 342 case SG_CCB_WAITING: 343 /* Caller will release the CCB */ 344 wakeup(&done_ccb->ccb_h.cbfcnp); 345 return; 346 case SG_CCB_RDWR_IO: 347 { 348 struct sg_rdwr *rdwr; 349 int state; 350 351 devstat_end_transaction( 352 &softc->device_stats, 353 csio->dxfer_len, 354 csio->tag_action & 0xf, 355 ((csio->ccb_h.flags & CAM_DIR_MASK) == 356 CAM_DIR_NONE) ? DEVSTAT_NO_DATA : 357 ((csio->ccb_h.flags & CAM_DIR_OUT) ? 358 DEVSTAT_WRITE : DEVSTAT_READ)); 359 360 rdwr = done_ccb->ccb_h.ccb_rdwr; 361 state = rdwr->state; 362 rdwr->state = SG_RDWR_DONE; 363 wakeup(rdwr); 364 break; 365 } 366 default: 367 panic("unknown sg CCB type"); 368 } 369 } 370 371 static int 372 sgopen(struct dev_open_args *ap) 373 /*cdev_t dev, int flags, int fmt, struct thread *td)*/ 374 { 375 struct cam_periph *periph; 376 struct sg_softc *softc; 377 int error = 0; 378 379 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1; 380 if (periph == NULL) 381 return (ENXIO); 382 383 /* 384 * Don't allow access when we're running at a high securelevel. 385 */ 386 if (securelevel > 1) { 387 cam_periph_unlock(periph); 388 cam_periph_release(periph); 389 return(EPERM); 390 } 391 cam_periph_lock(periph); 392 393 softc = (struct sg_softc *)periph->softc; 394 if (softc->flags & SG_FLAG_INVALID) { 395 cam_periph_unlock(periph); 396 return (ENXIO); 397 } 398 399 if ((softc->flags & SG_FLAG_OPEN) == 0) { 400 softc->flags |= SG_FLAG_OPEN; 401 cam_periph_unlock(periph); 402 } else { 403 /* Device closes aren't symmetrical, fix up the refcount. */ 404 cam_periph_unlock(periph); 405 cam_periph_release(periph); 406 } 407 408 return (error); 409 } 410 411 static int 412 sgclose(struct dev_close_args *ap) 413 /* cdev_t dev, int flag, int fmt, struct thread *td) */ 414 { 415 struct cam_periph *periph; 416 struct sg_softc *softc; 417 418 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1; 419 if (periph == NULL) 420 return (ENXIO); 421 422 cam_periph_lock(periph); 423 424 softc = (struct sg_softc *)periph->softc; 425 softc->flags &= ~SG_FLAG_OPEN; 426 427 cam_periph_unlock(periph); 428 cam_periph_release(periph); 429 430 return (0); 431 } 432 433 static int 434 sgioctl(struct dev_ioctl_args *ap) 435 /* cdev_t dev, u_long cmd, caddr_t arg, int flag, struct thread *td) */ 436 { 437 union ccb *ccb; 438 struct ccb_scsiio *csio; 439 struct cam_periph *periph; 440 struct sg_softc *softc; 441 struct sg_io_hdr req; 442 int dir, error; 443 444 periph = (struct cam_periph *)ap->a_head.a_dev->si_drv1; 445 if (periph == NULL) 446 return (ENXIO); 447 448 cam_periph_lock(periph); 449 450 softc = (struct sg_softc *)periph->softc; 451 error = 0; 452 453 switch (ap->a_cmd) { 454 case LINUX_SCSI_GET_BUS_NUMBER: { 455 int busno; 456 457 busno = xpt_path_path_id(periph->path); 458 error = copyout(&busno, ap->a_data, sizeof(busno)); 459 break; 460 } 461 case LINUX_SCSI_GET_IDLUN: { 462 struct scsi_idlun idlun; 463 struct cam_sim *sim; 464 465 idlun.dev_id = xpt_path_target_id(periph->path); 466 sim = xpt_path_sim(periph->path); 467 idlun.host_unique_id = sim->unit_number; 468 error = copyout(&idlun, ap->a_data, sizeof(idlun)); 469 break; 470 } 471 case SG_GET_VERSION_NUM: 472 case LINUX_SG_GET_VERSION_NUM: 473 error = copyout(&sg_version, ap->a_data, sizeof(sg_version)); 474 break; 475 case SG_SET_TIMEOUT: 476 case LINUX_SG_SET_TIMEOUT: { 477 u_int user_timeout; 478 479 error = copyin(ap->a_data, &user_timeout, sizeof(u_int)); 480 if (error == 0) { 481 softc->sg_user_timeout = user_timeout; 482 softc->sg_timeout = user_timeout / SG_DEFAULT_HZ * hz; 483 } 484 break; 485 } 486 case SG_GET_TIMEOUT: 487 case LINUX_SG_GET_TIMEOUT: 488 /* 489 * The value is returned directly to the syscall. 490 */ 491 ap->a_sysmsg->sm_result.iresult = softc->sg_user_timeout; 492 error = 0; 493 break; 494 case SG_IO: 495 case LINUX_SG_IO: 496 error = copyin(ap->a_data, &req, sizeof(req)); 497 if (error) 498 break; 499 500 if (req.cmd_len > IOCDBLEN) { 501 error = EINVAL; 502 break; 503 } 504 505 if (req.iovec_count != 0) { 506 error = EOPNOTSUPP; 507 break; 508 } 509 510 ccb = cam_periph_getccb(periph, /*priority*/5); 511 csio = &ccb->csio; 512 513 error = copyin(req.cmdp, &csio->cdb_io.cdb_bytes, 514 req.cmd_len); 515 if (error) { 516 xpt_release_ccb(ccb); 517 break; 518 } 519 520 switch(req.dxfer_direction) { 521 case SG_DXFER_TO_DEV: 522 dir = CAM_DIR_OUT; 523 break; 524 case SG_DXFER_FROM_DEV: 525 dir = CAM_DIR_IN; 526 break; 527 case SG_DXFER_TO_FROM_DEV: 528 dir = CAM_DIR_IN | CAM_DIR_OUT; 529 break; 530 case SG_DXFER_NONE: 531 default: 532 dir = CAM_DIR_NONE; 533 break; 534 } 535 536 cam_fill_csio(csio, 537 /*retries*/1, 538 sgdone, 539 dir|CAM_DEV_QFRZDIS, 540 MSG_SIMPLE_Q_TAG, 541 req.dxferp, 542 req.dxfer_len, 543 req.mx_sb_len, 544 req.cmd_len, 545 req.timeout); 546 547 error = sgsendccb(periph, ccb); 548 if (error) { 549 req.host_status = DID_ERROR; 550 req.driver_status = DRIVER_INVALID; 551 xpt_release_ccb(ccb); 552 break; 553 } 554 555 req.status = csio->scsi_status; 556 req.masked_status = (csio->scsi_status >> 1) & 0x7f; 557 sg_scsiio_status(csio, &req.host_status, &req.driver_status); 558 req.resid = csio->resid; 559 req.duration = csio->ccb_h.timeout; 560 req.info = 0; 561 562 error = copyout(&req, ap->a_data, sizeof(req)); 563 if ((error == 0) && (csio->ccb_h.status & CAM_AUTOSNS_VALID) 564 && (req.sbp != NULL)) { 565 req.sb_len_wr = req.mx_sb_len - csio->sense_resid; 566 error = copyout(&csio->sense_data, req.sbp, 567 req.sb_len_wr); 568 } 569 570 xpt_release_ccb(ccb); 571 break; 572 573 case SG_GET_RESERVED_SIZE: 574 case LINUX_SG_GET_RESERVED_SIZE: { 575 int size = 32768; 576 577 error = copyout(&size, ap->a_data, sizeof(size)); 578 break; 579 } 580 581 case SG_GET_SCSI_ID: 582 case LINUX_SG_GET_SCSI_ID: 583 { 584 struct sg_scsi_id id; 585 586 id.host_no = 0; /* XXX */ 587 id.channel = xpt_path_path_id(periph->path); 588 id.scsi_id = xpt_path_target_id(periph->path); 589 id.lun = xpt_path_lun_id(periph->path); 590 id.scsi_type = softc->pd_type; 591 id.h_cmd_per_lun = 1; 592 id.d_queue_depth = 1; 593 id.unused[0] = 0; 594 id.unused[1] = 0; 595 596 error = copyout(&id, ap->a_data, sizeof(id)); 597 break; 598 } 599 600 case SG_EMULATED_HOST: 601 case SG_SET_TRANSFORM: 602 case SG_GET_TRANSFORM: 603 case SG_GET_NUM_WAITING: 604 case SG_SCSI_RESET: 605 case SG_GET_REQUEST_TABLE: 606 case SG_SET_KEEP_ORPHAN: 607 case SG_GET_KEEP_ORPHAN: 608 case SG_GET_ACCESS_COUNT: 609 case SG_SET_FORCE_LOW_DMA: 610 case SG_GET_LOW_DMA: 611 case SG_GET_SG_TABLESIZE: 612 case SG_SET_FORCE_PACK_ID: 613 case SG_GET_PACK_ID: 614 case SG_SET_RESERVED_SIZE: 615 case SG_GET_COMMAND_Q: 616 case SG_SET_COMMAND_Q: 617 case SG_SET_DEBUG: 618 case SG_NEXT_CMD_LEN: 619 case LINUX_SG_EMULATED_HOST: 620 case LINUX_SG_SET_TRANSFORM: 621 case LINUX_SG_GET_TRANSFORM: 622 case LINUX_SG_GET_NUM_WAITING: 623 case LINUX_SG_SCSI_RESET: 624 case LINUX_SG_GET_REQUEST_TABLE: 625 case LINUX_SG_SET_KEEP_ORPHAN: 626 case LINUX_SG_GET_KEEP_ORPHAN: 627 case LINUX_SG_GET_ACCESS_COUNT: 628 case LINUX_SG_SET_FORCE_LOW_DMA: 629 case LINUX_SG_GET_LOW_DMA: 630 case LINUX_SG_GET_SG_TABLESIZE: 631 case LINUX_SG_SET_FORCE_PACK_ID: 632 case LINUX_SG_GET_PACK_ID: 633 case LINUX_SG_SET_RESERVED_SIZE: 634 case LINUX_SG_GET_COMMAND_Q: 635 case LINUX_SG_SET_COMMAND_Q: 636 case LINUX_SG_SET_DEBUG: 637 case LINUX_SG_NEXT_CMD_LEN: 638 default: 639 #ifdef CAMDEBUG 640 kprintf("sgioctl: rejecting cmd 0x%lx\n", ap->a_cmd); 641 #endif 642 error = ENODEV; 643 break; 644 } 645 646 cam_periph_unlock(periph); 647 return (error); 648 } 649 650 static int 651 sgwrite(struct dev_write_args *ap) 652 /*cdev_t dev, struct uio *uio, int ioflag)*/ 653 { 654 union ccb *ccb; 655 struct cam_periph *periph; 656 struct ccb_scsiio *csio; 657 struct sg_softc *sc; 658 struct sg_header *hdr; 659 struct sg_rdwr *rdwr; 660 u_char cdb_cmd; 661 char *buf; 662 int error = 0, cdb_len, buf_len, dir; 663 struct uio *uio = ap->a_uio; 664 665 periph = ap->a_head.a_dev->si_drv1; 666 rdwr = kmalloc(sizeof(*rdwr), M_DEVBUF, M_WAITOK | M_ZERO); 667 hdr = &rdwr->hdr.hdr; 668 669 /* Copy in the header block and sanity check it */ 670 if (uio->uio_resid < sizeof(*hdr)) { 671 error = EINVAL; 672 goto out_hdr; 673 } 674 error = uiomove((char *)hdr, sizeof(*hdr), uio); 675 if (error) 676 goto out_hdr; 677 678 ccb = xpt_alloc_ccb(); 679 if (ccb == NULL) { 680 error = ENOMEM; 681 goto out_hdr; 682 } 683 csio = &ccb->csio; 684 685 /* 686 * Copy in the CDB block. The designers of the interface didn't 687 * bother to provide a size for this in the header, so we have to 688 * figure it out ourselves. 689 */ 690 if (uio->uio_resid < 1) 691 goto out_ccb; 692 error = uiomove(&cdb_cmd, 1, uio); 693 if (error) 694 goto out_ccb; 695 if (hdr->twelve_byte) 696 cdb_len = 12; 697 else 698 cdb_len = scsi_group_len(cdb_cmd); 699 /* 700 * We've already read the first byte of the CDB and advanced the uio 701 * pointer. Just read the rest. 702 */ 703 csio->cdb_io.cdb_bytes[0] = cdb_cmd; 704 error = uiomove(&csio->cdb_io.cdb_bytes[1], cdb_len - 1, uio); 705 if (error) 706 goto out_ccb; 707 708 /* 709 * Now set up the data block. Again, the designers didn't bother 710 * to make this reliable. 711 */ 712 buf_len = uio->uio_resid; 713 if (buf_len != 0) { 714 buf = kmalloc(buf_len, M_DEVBUF, M_WAITOK | M_ZERO); 715 error = uiomove(buf, buf_len, uio); 716 if (error) 717 goto out_buf; 718 dir = CAM_DIR_OUT; 719 } else if (hdr->reply_len != 0) { 720 buf = kmalloc(hdr->reply_len, M_DEVBUF, M_WAITOK | M_ZERO); 721 buf_len = hdr->reply_len; 722 dir = CAM_DIR_IN; 723 } else { 724 buf = NULL; 725 buf_len = 0; 726 dir = CAM_DIR_NONE; 727 } 728 729 cam_periph_lock(periph); 730 sc = periph->softc; 731 xpt_setup_ccb(&ccb->ccb_h, periph->path, /*priority*/5); 732 cam_fill_csio(csio, 733 /*retries*/1, 734 sgdone, 735 dir|CAM_DEV_QFRZDIS, 736 MSG_SIMPLE_Q_TAG, 737 buf, 738 buf_len, 739 SG_MAX_SENSE, 740 cdb_len, 741 sc->sg_timeout); 742 743 /* 744 * Send off the command and hope that it works. This path does not 745 * go through sgstart because the I/O is supposed to be asynchronous. 746 */ 747 rdwr->buf = buf; 748 rdwr->buf_len = buf_len; 749 rdwr->tag = hdr->pack_id; 750 rdwr->ccb = ccb; 751 rdwr->state = SG_RDWR_INPROG; 752 ccb->ccb_h.ccb_rdwr = rdwr; 753 ccb->ccb_h.ccb_type = SG_CCB_RDWR_IO; 754 TAILQ_INSERT_TAIL(&sc->rdwr_done, rdwr, rdwr_link); 755 error = sgsendrdwr(periph, ccb); 756 cam_periph_unlock(periph); 757 return (error); 758 759 out_buf: 760 kfree(buf, M_DEVBUF); 761 out_ccb: 762 xpt_free_ccb(ccb); 763 out_hdr: 764 kfree(rdwr, M_DEVBUF); 765 return (error); 766 } 767 768 static int 769 sgread(struct dev_read_args *ap) 770 /*cdev_t 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 struct uio *uio = ap->a_uio; 780 781 periph = ap->a_head.a_dev->si_drv1; 782 783 /* XXX The pack len field needs to be updated and written out instead 784 * of discarded. Not sure how to do that. 785 */ 786 uio->uio_rw = UIO_WRITE; 787 if ((error = uiomove((char *)&pack_len, 4, uio)) != 0) 788 return (error); 789 if ((error = uiomove((char *)&reply_len, 4, uio)) != 0) 790 return (error); 791 if ((error = uiomove((char *)&pack_id, 4, uio)) != 0) 792 return (error); 793 uio->uio_rw = UIO_READ; 794 795 cam_periph_lock(periph); 796 sc = periph->softc; 797 search: 798 TAILQ_FOREACH(rdwr, &sc->rdwr_done, rdwr_link) { 799 if (rdwr->tag == pack_id) 800 break; 801 } 802 if (rdwr == NULL) { 803 cam_periph_unlock(periph); 804 if (tsleep(&hstat, PCATCH, "sgnull", 0) == ERESTART) 805 return(EAGAIN); 806 cam_periph_lock(periph); 807 goto search; 808 } 809 if (rdwr->state != SG_RDWR_DONE) { 810 tsleep_interlock(rdwr, PCATCH); 811 cam_periph_unlock(periph); 812 if (rdwr->state != SG_RDWR_DONE) { 813 if (tsleep(rdwr, PCATCH | PINTERLOCKED, "sgread", 0) == 814 ERESTART) { 815 return (EAGAIN); 816 } 817 } 818 cam_periph_lock(periph); 819 goto search; 820 } 821 TAILQ_REMOVE(&sc->rdwr_done, rdwr, rdwr_link); 822 cam_periph_unlock(periph); 823 824 hdr = &rdwr->hdr.hdr; 825 csio = &rdwr->ccb->csio; 826 sg_scsiio_status(csio, &hstat, &dstat); 827 hdr->host_status = hstat; 828 hdr->driver_status = dstat; 829 hdr->target_status = csio->scsi_status >> 1; 830 831 switch (hstat) { 832 case DID_OK: 833 case DID_PASSTHROUGH: 834 case DID_SOFT_ERROR: 835 hdr->result = 0; 836 break; 837 case DID_NO_CONNECT: 838 case DID_BUS_BUSY: 839 case DID_TIME_OUT: 840 hdr->result = EBUSY; 841 break; 842 case DID_BAD_TARGET: 843 case DID_ABORT: 844 case DID_PARITY: 845 case DID_RESET: 846 case DID_BAD_INTR: 847 case DID_ERROR: 848 default: 849 hdr->result = EIO; 850 break; 851 } 852 853 if (dstat == DRIVER_SENSE) { 854 bcopy(&csio->sense_data, hdr->sense_buffer, 855 min(csio->sense_len, SG_MAX_SENSE)); 856 #ifdef CAMDEBUG 857 scsi_sense_print(csio); 858 #endif 859 } 860 861 error = uiomove((char *)&hdr->result, sizeof(*hdr) - 862 offsetof(struct sg_header, result), uio); 863 if ((error == 0) && (hdr->result == 0)) 864 error = uiomove(rdwr->buf, rdwr->buf_len, uio); 865 866 cam_periph_lock(periph); 867 xpt_free_ccb(rdwr->ccb); 868 cam_periph_unlock(periph); 869 kfree(rdwr->buf, M_DEVBUF); 870 kfree(rdwr, M_DEVBUF); 871 return (error); 872 } 873 874 static int 875 sgsendccb(struct cam_periph *periph, union ccb *ccb) 876 { 877 struct sg_softc *softc; 878 struct cam_periph_map_info mapinfo; 879 int error, need_unmap = 0; 880 881 softc = periph->softc; 882 if (((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) 883 && (ccb->csio.data_ptr != NULL)) { 884 bzero(&mapinfo, sizeof(mapinfo)); 885 886 /* 887 * cam_periph_mapmem calls into proc and vm functions that can 888 * sleep as well as trigger I/O, so we can't hold the lock. 889 * Dropping it here is reasonably safe. 890 */ 891 cam_periph_unlock(periph); 892 error = cam_periph_mapmem(ccb, &mapinfo); 893 cam_periph_lock(periph); 894 if (error) 895 return (error); 896 need_unmap = 1; 897 } 898 899 error = cam_periph_runccb(ccb, sgerror, CAM_RETRY_SELTO, 900 SF_RETRY_UA, &softc->device_stats); 901 902 if (need_unmap) 903 cam_periph_unmapmem(ccb, &mapinfo); 904 905 return (error); 906 } 907 908 static int 909 sgsendrdwr(struct cam_periph *periph, union ccb *ccb) 910 { 911 struct sg_softc *softc; 912 913 softc = periph->softc; 914 devstat_start_transaction(&softc->device_stats); 915 xpt_action(ccb); 916 return (0); 917 } 918 919 static int 920 sgerror(union ccb *ccb, uint32_t cam_flags, uint32_t sense_flags) 921 { 922 struct cam_periph *periph; 923 struct sg_softc *softc; 924 925 periph = xpt_path_periph(ccb->ccb_h.path); 926 softc = (struct sg_softc *)periph->softc; 927 928 return (cam_periph_error(ccb, cam_flags, sense_flags, 929 &softc->saved_ccb)); 930 } 931 932 static void 933 sg_scsiio_status(struct ccb_scsiio *csio, u_short *hoststat, u_short *drvstat) 934 { 935 int status; 936 937 status = csio->ccb_h.status; 938 939 switch (status & CAM_STATUS_MASK) { 940 case CAM_REQ_CMP: 941 *hoststat = DID_OK; 942 *drvstat = 0; 943 break; 944 case CAM_REQ_CMP_ERR: 945 *hoststat = DID_ERROR; 946 *drvstat = 0; 947 break; 948 case CAM_REQ_ABORTED: 949 *hoststat = DID_ABORT; 950 *drvstat = 0; 951 break; 952 case CAM_REQ_INVALID: 953 *hoststat = DID_ERROR; 954 *drvstat = DRIVER_INVALID; 955 break; 956 case CAM_DEV_NOT_THERE: 957 *hoststat = DID_BAD_TARGET; 958 *drvstat = 0; 959 break; 960 case CAM_SEL_TIMEOUT: 961 *hoststat = DID_NO_CONNECT; 962 *drvstat = 0; 963 break; 964 case CAM_CMD_TIMEOUT: 965 *hoststat = DID_TIME_OUT; 966 *drvstat = 0; 967 break; 968 case CAM_SCSI_STATUS_ERROR: 969 *hoststat = DID_ERROR; 970 *drvstat = 0; 971 break; 972 case CAM_SCSI_BUS_RESET: 973 *hoststat = DID_RESET; 974 *drvstat = 0; 975 break; 976 case CAM_UNCOR_PARITY: 977 *hoststat = DID_PARITY; 978 *drvstat = 0; 979 break; 980 case CAM_SCSI_BUSY: 981 *hoststat = DID_BUS_BUSY; 982 *drvstat = 0; 983 break; 984 default: 985 *hoststat = DID_ERROR; 986 *drvstat = DRIVER_ERROR; 987 } 988 989 if (status & CAM_AUTOSNS_VALID) 990 *drvstat = DRIVER_SENSE; 991 } 992 993 static int 994 scsi_group_len(u_char cmd) 995 { 996 int len[] = {6, 10, 10, 12, 12, 12, 10, 10}; 997 int group; 998 999 group = (cmd >> 5) & 0x7; 1000 return (len[group]); 1001 } 1002