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sys/cam/scsi/scsi_enc.c
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1 /*- 2 * Copyright (c) 2000 Matthew Jacob 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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/10.1/sys/cam/scsi/scsi_enc.c 260387 2014-01-07 01:51:48Z scottl $"); 29 30 #include <sys/param.h> 31 32 #include <sys/conf.h> 33 #include <sys/errno.h> 34 #include <sys/fcntl.h> 35 #include <sys/kernel.h> 36 #include <sys/kthread.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/queue.h> 41 #include <sys/sx.h> 42 #include <sys/systm.h> 43 #include <sys/sysctl.h> 44 #include <sys/types.h> 45 46 #include <machine/stdarg.h> 47 48 #include <cam/cam.h> 49 #include <cam/cam_ccb.h> 50 #include <cam/cam_debug.h> 51 #include <cam/cam_periph.h> 52 #include <cam/cam_xpt_periph.h> 53 54 #include <cam/scsi/scsi_all.h> 55 #include <cam/scsi/scsi_message.h> 56 #include <cam/scsi/scsi_enc.h> 57 #include <cam/scsi/scsi_enc_internal.h> 58 59 #include <opt_ses.h> 60 61 MALLOC_DEFINE(M_SCSIENC, "SCSI ENC", "SCSI ENC buffers"); 62 63 /* Enclosure type independent driver */ 64 65 static d_open_t enc_open; 66 static d_close_t enc_close; 67 static d_ioctl_t enc_ioctl; 68 static periph_init_t enc_init; 69 static periph_ctor_t enc_ctor; 70 static periph_oninv_t enc_oninvalidate; 71 static periph_dtor_t enc_dtor; 72 73 static void enc_async(void *, uint32_t, struct cam_path *, void *); 74 static enctyp enc_type(struct ccb_getdev *); 75 76 SYSCTL_NODE(_kern_cam, OID_AUTO, enc, CTLFLAG_RD, 0, 77 "CAM Enclosure Services driver"); 78 79 static struct periph_driver encdriver = { 80 enc_init, "ses", 81 TAILQ_HEAD_INITIALIZER(encdriver.units), /* generation */ 0 82 }; 83 84 PERIPHDRIVER_DECLARE(enc, encdriver); 85 86 static struct cdevsw enc_cdevsw = { 87 .d_version = D_VERSION, 88 .d_open = enc_open, 89 .d_close = enc_close, 90 .d_ioctl = enc_ioctl, 91 .d_name = "ses", 92 .d_flags = D_TRACKCLOSE, 93 }; 94 95 static void 96 enc_init(void) 97 { 98 cam_status status; 99 100 /* 101 * Install a global async callback. This callback will 102 * receive async callbacks like "new device found". 103 */ 104 status = xpt_register_async(AC_FOUND_DEVICE, enc_async, NULL, NULL); 105 106 if (status != CAM_REQ_CMP) { 107 printf("enc: Failed to attach master async callback " 108 "due to status 0x%x!\n", status); 109 } 110 } 111 112 static void 113 enc_devgonecb(void *arg) 114 { 115 struct cam_periph *periph; 116 struct enc_softc *enc; 117 struct mtx *mtx; 118 int i; 119 120 periph = (struct cam_periph *)arg; 121 mtx = cam_periph_mtx(periph); 122 mtx_lock(mtx); 123 enc = (struct enc_softc *)periph->softc; 124 125 /* 126 * When we get this callback, we will get no more close calls from 127 * devfs. So if we have any dangling opens, we need to release the 128 * reference held for that particular context. 129 */ 130 for (i = 0; i < enc->open_count; i++) 131 cam_periph_release_locked(periph); 132 133 enc->open_count = 0; 134 135 /* 136 * Release the reference held for the device node, it is gone now. 137 */ 138 cam_periph_release_locked(periph); 139 140 /* 141 * We reference the lock directly here, instead of using 142 * cam_periph_unlock(). The reason is that the final call to 143 * cam_periph_release_locked() above could result in the periph 144 * getting freed. If that is the case, dereferencing the periph 145 * with a cam_periph_unlock() call would cause a page fault. 146 */ 147 mtx_unlock(mtx); 148 } 149 150 static void 151 enc_oninvalidate(struct cam_periph *periph) 152 { 153 struct enc_softc *enc; 154 155 enc = periph->softc; 156 157 enc->enc_flags |= ENC_FLAG_INVALID; 158 159 /* If the sub-driver has an invalidate routine, call it */ 160 if (enc->enc_vec.softc_invalidate != NULL) 161 enc->enc_vec.softc_invalidate(enc); 162 163 /* 164 * Unregister any async callbacks. 165 */ 166 xpt_register_async(0, enc_async, periph, periph->path); 167 168 /* 169 * Shutdown our daemon. 170 */ 171 enc->enc_flags |= ENC_FLAG_SHUTDOWN; 172 if (enc->enc_daemon != NULL) { 173 /* Signal the ses daemon to terminate. */ 174 wakeup(enc->enc_daemon); 175 } 176 callout_drain(&enc->status_updater); 177 178 destroy_dev_sched_cb(enc->enc_dev, enc_devgonecb, periph); 179 } 180 181 static void 182 enc_dtor(struct cam_periph *periph) 183 { 184 struct enc_softc *enc; 185 186 enc = periph->softc; 187 188 /* If the sub-driver has a cleanup routine, call it */ 189 if (enc->enc_vec.softc_cleanup != NULL) 190 enc->enc_vec.softc_cleanup(enc); 191 192 if (enc->enc_boot_hold_ch.ich_func != NULL) { 193 config_intrhook_disestablish(&enc->enc_boot_hold_ch); 194 enc->enc_boot_hold_ch.ich_func = NULL; 195 } 196 197 ENC_FREE(enc); 198 } 199 200 static void 201 enc_async(void *callback_arg, uint32_t code, struct cam_path *path, void *arg) 202 { 203 struct cam_periph *periph; 204 205 periph = (struct cam_periph *)callback_arg; 206 207 switch(code) { 208 case AC_FOUND_DEVICE: 209 { 210 struct ccb_getdev *cgd; 211 cam_status status; 212 path_id_t path_id; 213 214 cgd = (struct ccb_getdev *)arg; 215 if (arg == NULL) { 216 break; 217 } 218 219 if (enc_type(cgd) == ENC_NONE) { 220 /* 221 * Schedule announcement of the ENC bindings for 222 * this device if it is managed by a SEP. 223 */ 224 path_id = xpt_path_path_id(path); 225 xpt_lock_buses(); 226 TAILQ_FOREACH(periph, &encdriver.units, unit_links) { 227 struct enc_softc *softc; 228 229 softc = (struct enc_softc *)periph->softc; 230 if (xpt_path_path_id(periph->path) != path_id 231 || softc == NULL 232 || (softc->enc_flags & ENC_FLAG_INITIALIZED) 233 == 0 234 || softc->enc_vec.device_found == NULL) 235 continue; 236 237 softc->enc_vec.device_found(softc); 238 } 239 xpt_unlock_buses(); 240 return; 241 } 242 243 status = cam_periph_alloc(enc_ctor, enc_oninvalidate, 244 enc_dtor, NULL, "ses", CAM_PERIPH_BIO, 245 path, enc_async, AC_FOUND_DEVICE, cgd); 246 247 if (status != CAM_REQ_CMP && status != CAM_REQ_INPROG) { 248 printf("enc_async: Unable to probe new device due to " 249 "status 0x%x\n", status); 250 } 251 break; 252 } 253 default: 254 cam_periph_async(periph, code, path, arg); 255 break; 256 } 257 } 258 259 static int 260 enc_open(struct cdev *dev, int flags, int fmt, struct thread *td) 261 { 262 struct cam_periph *periph; 263 struct enc_softc *softc; 264 int error = 0; 265 266 periph = (struct cam_periph *)dev->si_drv1; 267 if (periph == NULL) { 268 return (ENXIO); 269 } 270 271 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 272 return (ENXIO); 273 274 cam_periph_lock(periph); 275 276 softc = (struct enc_softc *)periph->softc; 277 278 if ((softc->enc_flags & ENC_FLAG_INITIALIZED) == 0) { 279 error = ENXIO; 280 goto out; 281 } 282 if (softc->enc_flags & ENC_FLAG_INVALID) { 283 error = ENXIO; 284 goto out; 285 } 286 out: 287 if (error != 0) 288 cam_periph_release_locked(periph); 289 else 290 softc->open_count++; 291 292 cam_periph_unlock(periph); 293 294 return (error); 295 } 296 297 static int 298 enc_close(struct cdev *dev, int flag, int fmt, struct thread *td) 299 { 300 struct cam_periph *periph; 301 struct enc_softc *enc; 302 struct mtx *mtx; 303 304 periph = (struct cam_periph *)dev->si_drv1; 305 if (periph == NULL) 306 return (ENXIO); 307 mtx = cam_periph_mtx(periph); 308 mtx_lock(mtx); 309 310 enc = periph->softc; 311 enc->open_count--; 312 313 cam_periph_release_locked(periph); 314 315 /* 316 * We reference the lock directly here, instead of using 317 * cam_periph_unlock(). The reason is that the call to 318 * cam_periph_release_locked() above could result in the periph 319 * getting freed. If that is the case, dereferencing the periph 320 * with a cam_periph_unlock() call would cause a page fault. 321 * 322 * cam_periph_release() avoids this problem using the same method, 323 * but we're manually acquiring and dropping the lock here to 324 * protect the open count and avoid another lock acquisition and 325 * release. 326 */ 327 mtx_unlock(mtx); 328 329 return (0); 330 } 331 332 int 333 enc_error(union ccb *ccb, uint32_t cflags, uint32_t sflags) 334 { 335 struct enc_softc *softc; 336 struct cam_periph *periph; 337 338 periph = xpt_path_periph(ccb->ccb_h.path); 339 softc = (struct enc_softc *)periph->softc; 340 341 return (cam_periph_error(ccb, cflags, sflags, &softc->saved_ccb)); 342 } 343 344 static int 345 enc_ioctl(struct cdev *dev, u_long cmd, caddr_t arg_addr, int flag, 346 struct thread *td) 347 { 348 struct cam_periph *periph; 349 encioc_enc_status_t tmp; 350 encioc_string_t sstr; 351 encioc_elm_status_t elms; 352 encioc_elm_desc_t elmd; 353 encioc_elm_devnames_t elmdn; 354 encioc_element_t *uelm; 355 enc_softc_t *enc; 356 enc_cache_t *cache; 357 void *addr; 358 int error, i; 359 360 361 if (arg_addr) 362 addr = *((caddr_t *) arg_addr); 363 else 364 addr = NULL; 365 366 periph = (struct cam_periph *)dev->si_drv1; 367 if (periph == NULL) 368 return (ENXIO); 369 370 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("entering encioctl\n")); 371 372 cam_periph_lock(periph); 373 enc = (struct enc_softc *)periph->softc; 374 cache = &enc->enc_cache; 375 376 /* 377 * Now check to see whether we're initialized or not. 378 * This actually should never fail as we're not supposed 379 * to get past enc_open w/o successfully initializing 380 * things. 381 */ 382 if ((enc->enc_flags & ENC_FLAG_INITIALIZED) == 0) { 383 cam_periph_unlock(periph); 384 return (ENXIO); 385 } 386 cam_periph_unlock(periph); 387 388 error = 0; 389 390 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, 391 ("trying to do ioctl %#lx\n", cmd)); 392 393 /* 394 * If this command can change the device's state, 395 * we must have the device open for writing. 396 * 397 * For commands that get information about the 398 * device- we don't need to lock the peripheral 399 * if we aren't running a command. The periph 400 * also can't go away while a user process has 401 * it open. 402 */ 403 switch (cmd) { 404 case ENCIOC_GETNELM: 405 case ENCIOC_GETELMMAP: 406 case ENCIOC_GETENCSTAT: 407 case ENCIOC_GETELMSTAT: 408 case ENCIOC_GETELMDESC: 409 case ENCIOC_GETELMDEVNAMES: 410 break; 411 default: 412 if ((flag & FWRITE) == 0) { 413 return (EBADF); 414 } 415 } 416 417 /* 418 * XXX The values read here are only valid for the current 419 * configuration generation. We need these ioctls 420 * to also pass in/out a generation number. 421 */ 422 sx_slock(&enc->enc_cache_lock); 423 switch (cmd) { 424 case ENCIOC_GETNELM: 425 error = copyout(&cache->nelms, addr, sizeof (cache->nelms)); 426 break; 427 428 case ENCIOC_GETELMMAP: 429 for (uelm = addr, i = 0; i != cache->nelms; i++) { 430 encioc_element_t kelm; 431 kelm.elm_idx = i; 432 kelm.elm_subenc_id = cache->elm_map[i].subenclosure; 433 kelm.elm_type = cache->elm_map[i].enctype; 434 error = copyout(&kelm, &uelm[i], sizeof(kelm)); 435 if (error) 436 break; 437 } 438 break; 439 440 case ENCIOC_GETENCSTAT: 441 cam_periph_lock(periph); 442 error = enc->enc_vec.get_enc_status(enc, 1); 443 if (error) { 444 cam_periph_unlock(periph); 445 break; 446 } 447 tmp = cache->enc_status; 448 cam_periph_unlock(periph); 449 error = copyout(&tmp, addr, sizeof(tmp)); 450 cache->enc_status = tmp; 451 break; 452 453 case ENCIOC_SETENCSTAT: 454 error = copyin(addr, &tmp, sizeof(tmp)); 455 if (error) 456 break; 457 cam_periph_lock(periph); 458 error = enc->enc_vec.set_enc_status(enc, tmp, 1); 459 cam_periph_unlock(periph); 460 break; 461 462 case ENCIOC_GETSTRING: 463 case ENCIOC_SETSTRING: 464 if (enc->enc_vec.handle_string == NULL) { 465 error = EINVAL; 466 break; 467 } 468 error = copyin(addr, &sstr, sizeof(sstr)); 469 if (error) 470 break; 471 cam_periph_lock(periph); 472 error = enc->enc_vec.handle_string(enc, &sstr, cmd); 473 cam_periph_unlock(periph); 474 break; 475 476 case ENCIOC_GETELMSTAT: 477 error = copyin(addr, &elms, sizeof(elms)); 478 if (error) 479 break; 480 if (elms.elm_idx >= cache->nelms) { 481 error = EINVAL; 482 break; 483 } 484 cam_periph_lock(periph); 485 error = enc->enc_vec.get_elm_status(enc, &elms, 1); 486 cam_periph_unlock(periph); 487 if (error) 488 break; 489 error = copyout(&elms, addr, sizeof(elms)); 490 break; 491 492 case ENCIOC_GETELMDESC: 493 error = copyin(addr, &elmd, sizeof(elmd)); 494 if (error) 495 break; 496 if (elmd.elm_idx >= cache->nelms) { 497 error = EINVAL; 498 break; 499 } 500 if (enc->enc_vec.get_elm_desc != NULL) { 501 error = enc->enc_vec.get_elm_desc(enc, &elmd); 502 if (error) 503 break; 504 } else 505 elmd.elm_desc_len = 0; 506 error = copyout(&elmd, addr, sizeof(elmd)); 507 break; 508 509 case ENCIOC_GETELMDEVNAMES: 510 if (enc->enc_vec.get_elm_devnames == NULL) { 511 error = EINVAL; 512 break; 513 } 514 error = copyin(addr, &elmdn, sizeof(elmdn)); 515 if (error) 516 break; 517 if (elmdn.elm_idx >= cache->nelms) { 518 error = EINVAL; 519 break; 520 } 521 cam_periph_lock(periph); 522 error = (*enc->enc_vec.get_elm_devnames)(enc, &elmdn); 523 cam_periph_unlock(periph); 524 if (error) 525 break; 526 error = copyout(&elmdn, addr, sizeof(elmdn)); 527 break; 528 529 case ENCIOC_SETELMSTAT: 530 error = copyin(addr, &elms, sizeof(elms)); 531 if (error) 532 break; 533 534 if (elms.elm_idx >= cache->nelms) { 535 error = EINVAL; 536 break; 537 } 538 cam_periph_lock(periph); 539 error = enc->enc_vec.set_elm_status(enc, &elms, 1); 540 cam_periph_unlock(periph); 541 542 break; 543 544 case ENCIOC_INIT: 545 546 cam_periph_lock(periph); 547 error = enc->enc_vec.init_enc(enc); 548 cam_periph_unlock(periph); 549 break; 550 551 default: 552 cam_periph_lock(periph); 553 error = cam_periph_ioctl(periph, cmd, arg_addr, enc_error); 554 cam_periph_unlock(periph); 555 break; 556 } 557 sx_sunlock(&enc->enc_cache_lock); 558 return (error); 559 } 560 561 int 562 enc_runcmd(struct enc_softc *enc, char *cdb, int cdbl, char *dptr, int *dlenp) 563 { 564 int error, dlen, tdlen; 565 ccb_flags ddf; 566 union ccb *ccb; 567 568 CAM_DEBUG(enc->periph->path, CAM_DEBUG_TRACE, 569 ("entering enc_runcmd\n")); 570 if (dptr) { 571 if ((dlen = *dlenp) < 0) { 572 dlen = -dlen; 573 ddf = CAM_DIR_OUT; 574 } else { 575 ddf = CAM_DIR_IN; 576 } 577 } else { 578 dlen = 0; 579 ddf = CAM_DIR_NONE; 580 } 581 582 if (cdbl > IOCDBLEN) { 583 cdbl = IOCDBLEN; 584 } 585 586 ccb = cam_periph_getccb(enc->periph, CAM_PRIORITY_NORMAL); 587 if (enc->enc_type == ENC_SEMB_SES || enc->enc_type == ENC_SEMB_SAFT) { 588 tdlen = min(dlen, 1020); 589 tdlen = (tdlen + 3) & ~3; 590 cam_fill_ataio(&ccb->ataio, 0, NULL, ddf, 0, dptr, tdlen, 591 30 * 1000); 592 if (cdb[0] == RECEIVE_DIAGNOSTIC) 593 ata_28bit_cmd(&ccb->ataio, 594 ATA_SEP_ATTN, cdb[2], 0x02, tdlen / 4); 595 else if (cdb[0] == SEND_DIAGNOSTIC) 596 ata_28bit_cmd(&ccb->ataio, 597 ATA_SEP_ATTN, dlen > 0 ? dptr[0] : 0, 598 0x82, tdlen / 4); 599 else if (cdb[0] == READ_BUFFER) 600 ata_28bit_cmd(&ccb->ataio, 601 ATA_SEP_ATTN, cdb[2], 0x00, tdlen / 4); 602 else 603 ata_28bit_cmd(&ccb->ataio, 604 ATA_SEP_ATTN, dlen > 0 ? dptr[0] : 0, 605 0x80, tdlen / 4); 606 } else { 607 tdlen = dlen; 608 cam_fill_csio(&ccb->csio, 0, NULL, ddf, MSG_SIMPLE_Q_TAG, 609 dptr, dlen, sizeof (struct scsi_sense_data), cdbl, 610 60 * 1000); 611 bcopy(cdb, ccb->csio.cdb_io.cdb_bytes, cdbl); 612 } 613 614 error = cam_periph_runccb(ccb, enc_error, ENC_CFLAGS, ENC_FLAGS, NULL); 615 if (error) { 616 if (dptr) { 617 *dlenp = dlen; 618 } 619 } else { 620 if (dptr) { 621 if (ccb->ccb_h.func_code == XPT_ATA_IO) 622 *dlenp = ccb->ataio.resid; 623 else 624 *dlenp = ccb->csio.resid; 625 *dlenp += tdlen - dlen; 626 } 627 } 628 xpt_release_ccb(ccb); 629 CAM_DEBUG(enc->periph->path, CAM_DEBUG_SUBTRACE, 630 ("exiting enc_runcmd: *dlenp = %d\n", *dlenp)); 631 return (error); 632 } 633 634 void 635 enc_log(struct enc_softc *enc, const char *fmt, ...) 636 { 637 va_list ap; 638 639 printf("%s%d: ", enc->periph->periph_name, enc->periph->unit_number); 640 va_start(ap, fmt); 641 vprintf(fmt, ap); 642 va_end(ap); 643 } 644 645 /* 646 * The code after this point runs on many platforms, 647 * so forgive the slightly awkward and nonconforming 648 * appearance. 649 */ 650 651 /* 652 * Is this a device that supports enclosure services? 653 * 654 * It's a pretty simple ruleset- if it is device type 655 * 0x0D (13), it's an ENCLOSURE device. 656 */ 657 658 #define SAFTE_START 44 659 #define SAFTE_END 50 660 #define SAFTE_LEN SAFTE_END-SAFTE_START 661 662 static enctyp 663 enc_type(struct ccb_getdev *cgd) 664 { 665 int buflen; 666 unsigned char *iqd; 667 668 if (cgd->protocol == PROTO_SEMB) { 669 iqd = (unsigned char *)&cgd->ident_data; 670 if (STRNCMP(iqd + 43, "S-E-S", 5) == 0) 671 return (ENC_SEMB_SES); 672 else if (STRNCMP(iqd + 43, "SAF-TE", 6) == 0) 673 return (ENC_SEMB_SAFT); 674 return (ENC_NONE); 675 676 } else if (cgd->protocol != PROTO_SCSI) 677 return (ENC_NONE); 678 679 iqd = (unsigned char *)&cgd->inq_data; 680 buflen = min(sizeof(cgd->inq_data), 681 SID_ADDITIONAL_LENGTH(&cgd->inq_data)); 682 683 if ((iqd[0] & 0x1f) == T_ENCLOSURE) { 684 if ((iqd[2] & 0x7) > 2) { 685 return (ENC_SES); 686 } else { 687 return (ENC_SES_SCSI2); 688 } 689 return (ENC_NONE); 690 } 691 692 #ifdef SES_ENABLE_PASSTHROUGH 693 if ((iqd[6] & 0x40) && (iqd[2] & 0x7) >= 2) { 694 /* 695 * PassThrough Device. 696 */ 697 return (ENC_SES_PASSTHROUGH); 698 } 699 #endif 700 701 /* 702 * The comparison is short for a reason- 703 * some vendors were chopping it short. 704 */ 705 706 if (buflen < SAFTE_END - 2) { 707 return (ENC_NONE); 708 } 709 710 if (STRNCMP((char *)&iqd[SAFTE_START], "SAF-TE", SAFTE_LEN - 2) == 0) { 711 return (ENC_SAFT); 712 } 713 return (ENC_NONE); 714 } 715 716 /*================== Enclosure Monitoring/Processing Daemon ==================*/ 717 /** 718 * \brief Queue an update request for a given action, if needed. 719 * 720 * \param enc SES softc to queue the request for. 721 * \param action Action requested. 722 */ 723 void 724 enc_update_request(enc_softc_t *enc, uint32_t action) 725 { 726 if ((enc->pending_actions & (0x1 << action)) == 0) { 727 enc->pending_actions |= (0x1 << action); 728 ENC_DLOG(enc, "%s: queing requested action %d\n", 729 __func__, action); 730 if (enc->current_action == ENC_UPDATE_NONE) 731 wakeup(enc->enc_daemon); 732 } else { 733 ENC_DLOG(enc, "%s: ignoring requested action %d - " 734 "Already queued\n", __func__, action); 735 } 736 } 737 738 /** 739 * \brief Invoke the handler of the highest priority pending 740 * state in the SES state machine. 741 * 742 * \param enc The SES instance invoking the state machine. 743 */ 744 static void 745 enc_fsm_step(enc_softc_t *enc) 746 { 747 union ccb *ccb; 748 uint8_t *buf; 749 struct enc_fsm_state *cur_state; 750 int error; 751 uint32_t xfer_len; 752 753 ENC_DLOG(enc, "%s enter %p\n", __func__, enc); 754 755 enc->current_action = ffs(enc->pending_actions) - 1; 756 enc->pending_actions &= ~(0x1 << enc->current_action); 757 758 cur_state = &enc->enc_fsm_states[enc->current_action]; 759 760 buf = NULL; 761 if (cur_state->buf_size != 0) { 762 cam_periph_unlock(enc->periph); 763 buf = malloc(cur_state->buf_size, M_SCSIENC, M_WAITOK|M_ZERO); 764 cam_periph_lock(enc->periph); 765 } 766 767 error = 0; 768 ccb = NULL; 769 if (cur_state->fill != NULL) { 770 ccb = cam_periph_getccb(enc->periph, CAM_PRIORITY_NORMAL); 771 772 error = cur_state->fill(enc, cur_state, ccb, buf); 773 if (error != 0) 774 goto done; 775 776 error = cam_periph_runccb(ccb, cur_state->error, 777 ENC_CFLAGS, 778 ENC_FLAGS|SF_QUIET_IR, NULL); 779 } 780 781 if (ccb != NULL) { 782 if (ccb->ccb_h.func_code == XPT_ATA_IO) 783 xfer_len = ccb->ataio.dxfer_len - ccb->ataio.resid; 784 else 785 xfer_len = ccb->csio.dxfer_len - ccb->csio.resid; 786 } else 787 xfer_len = 0; 788 789 cam_periph_unlock(enc->periph); 790 cur_state->done(enc, cur_state, ccb, &buf, error, xfer_len); 791 cam_periph_lock(enc->periph); 792 793 done: 794 ENC_DLOG(enc, "%s exit - result %d\n", __func__, error); 795 ENC_FREE_AND_NULL(buf); 796 if (ccb != NULL) 797 xpt_release_ccb(ccb); 798 } 799 800 /** 801 * \invariant Called with cam_periph mutex held. 802 */ 803 static void 804 enc_status_updater(void *arg) 805 { 806 enc_softc_t *enc; 807 808 enc = arg; 809 if (enc->enc_vec.poll_status != NULL) 810 enc->enc_vec.poll_status(enc); 811 } 812 813 static void 814 enc_daemon(void *arg) 815 { 816 enc_softc_t *enc; 817 818 enc = arg; 819 820 cam_periph_lock(enc->periph); 821 while ((enc->enc_flags & ENC_FLAG_SHUTDOWN) == 0) { 822 if (enc->pending_actions == 0) { 823 struct intr_config_hook *hook; 824 825 /* 826 * Reset callout and msleep, or 827 * issue timed task completion 828 * status command. 829 */ 830 enc->current_action = ENC_UPDATE_NONE; 831 832 /* 833 * We've been through our state machine at least 834 * once. Allow the transition to userland. 835 */ 836 hook = &enc->enc_boot_hold_ch; 837 if (hook->ich_func != NULL) { 838 config_intrhook_disestablish(hook); 839 hook->ich_func = NULL; 840 } 841 842 callout_reset(&enc->status_updater, 60*hz, 843 enc_status_updater, enc); 844 845 cam_periph_sleep(enc->periph, enc->enc_daemon, 846 PUSER, "idle", 0); 847 } else { 848 enc_fsm_step(enc); 849 } 850 } 851 enc->enc_daemon = NULL; 852 cam_periph_unlock(enc->periph); 853 cam_periph_release(enc->periph); 854 kproc_exit(0); 855 } 856 857 static int 858 enc_kproc_init(enc_softc_t *enc) 859 { 860 int result; 861 862 callout_init_mtx(&enc->status_updater, cam_periph_mtx(enc->periph), 0); 863 864 if (cam_periph_acquire(enc->periph) != CAM_REQ_CMP) 865 return (ENXIO); 866 867 result = kproc_create(enc_daemon, enc, &enc->enc_daemon, /*flags*/0, 868 /*stackpgs*/0, "enc_daemon%d", 869 enc->periph->unit_number); 870 if (result == 0) { 871 /* Do an initial load of all page data. */ 872 cam_periph_lock(enc->periph); 873 enc->enc_vec.poll_status(enc); 874 cam_periph_unlock(enc->periph); 875 } else 876 cam_periph_release(enc->periph); 877 return (result); 878 } 879 880 /** 881 * \brief Interrupt configuration hook callback associated with 882 * enc_boot_hold_ch. 883 * 884 * Since interrupts are always functional at the time of enclosure 885 * configuration, there is nothing to be done when the callback occurs. 886 * This hook is only registered to hold up boot processing while initial 887 * eclosure processing occurs. 888 * 889 * \param arg The enclosure softc, but currently unused in this callback. 890 */ 891 static void 892 enc_nop_confighook_cb(void *arg __unused) 893 { 894 } 895 896 static cam_status 897 enc_ctor(struct cam_periph *periph, void *arg) 898 { 899 cam_status status = CAM_REQ_CMP_ERR; 900 int err; 901 enc_softc_t *enc; 902 struct ccb_getdev *cgd; 903 char *tname; 904 905 cgd = (struct ccb_getdev *)arg; 906 if (cgd == NULL) { 907 printf("enc_ctor: no getdev CCB, can't register device\n"); 908 goto out; 909 } 910 911 enc = ENC_MALLOCZ(sizeof(*enc)); 912 if (enc == NULL) { 913 printf("enc_ctor: Unable to probe new device. " 914 "Unable to allocate enc\n"); 915 goto out; 916 } 917 enc->periph = periph; 918 enc->current_action = ENC_UPDATE_INVALID; 919 920 enc->enc_type = enc_type(cgd); 921 sx_init(&enc->enc_cache_lock, "enccache"); 922 923 switch (enc->enc_type) { 924 case ENC_SES: 925 case ENC_SES_SCSI2: 926 case ENC_SES_PASSTHROUGH: 927 case ENC_SEMB_SES: 928 err = ses_softc_init(enc); 929 break; 930 case ENC_SAFT: 931 case ENC_SEMB_SAFT: 932 err = safte_softc_init(enc); 933 break; 934 case ENC_NONE: 935 default: 936 ENC_FREE(enc); 937 return (CAM_REQ_CMP_ERR); 938 } 939 940 if (err) { 941 xpt_print(periph->path, "error %d initializing\n", err); 942 goto out; 943 } 944 945 /* 946 * Hold off userland until we have made at least one pass 947 * through our state machine so that physical path data is 948 * present. 949 */ 950 if (enc->enc_vec.poll_status != NULL) { 951 enc->enc_boot_hold_ch.ich_func = enc_nop_confighook_cb; 952 enc->enc_boot_hold_ch.ich_arg = enc; 953 config_intrhook_establish(&enc->enc_boot_hold_ch); 954 } 955 956 /* 957 * The softc field is set only once the enc is fully initialized 958 * so that we can rely on this field to detect partially 959 * initialized periph objects in the AC_FOUND_DEVICE handler. 960 */ 961 periph->softc = enc; 962 963 cam_periph_unlock(periph); 964 if (enc->enc_vec.poll_status != NULL) { 965 err = enc_kproc_init(enc); 966 if (err) { 967 xpt_print(periph->path, 968 "error %d starting enc_daemon\n", err); 969 goto out; 970 } 971 } 972 973 /* 974 * Acquire a reference to the periph before we create the devfs 975 * instance for it. We'll release this reference once the devfs 976 * instance has been freed. 977 */ 978 if (cam_periph_acquire(periph) != CAM_REQ_CMP) { 979 xpt_print(periph->path, "%s: lost periph during " 980 "registration!\n", __func__); 981 cam_periph_lock(periph); 982 983 return (CAM_REQ_CMP_ERR); 984 } 985 986 enc->enc_dev = make_dev(&enc_cdevsw, periph->unit_number, 987 UID_ROOT, GID_OPERATOR, 0600, "%s%d", 988 periph->periph_name, periph->unit_number); 989 990 cam_periph_lock(periph); 991 enc->enc_dev->si_drv1 = periph; 992 993 enc->enc_flags |= ENC_FLAG_INITIALIZED; 994 995 /* 996 * Add an async callback so that we get notified if this 997 * device goes away. 998 */ 999 xpt_register_async(AC_LOST_DEVICE, enc_async, periph, periph->path); 1000 1001 switch (enc->enc_type) { 1002 default: 1003 case ENC_NONE: 1004 tname = "No ENC device"; 1005 break; 1006 case ENC_SES_SCSI2: 1007 tname = "SCSI-2 ENC Device"; 1008 break; 1009 case ENC_SES: 1010 tname = "SCSI-3 ENC Device"; 1011 break; 1012 case ENC_SES_PASSTHROUGH: 1013 tname = "ENC Passthrough Device"; 1014 break; 1015 case ENC_SAFT: 1016 tname = "SAF-TE Compliant Device"; 1017 break; 1018 case ENC_SEMB_SES: 1019 tname = "SEMB SES Device"; 1020 break; 1021 case ENC_SEMB_SAFT: 1022 tname = "SEMB SAF-TE Device"; 1023 break; 1024 } 1025 xpt_announce_periph(periph, tname); 1026 status = CAM_REQ_CMP; 1027 1028 out: 1029 if (status != CAM_REQ_CMP) 1030 enc_dtor(periph); 1031 return (status); 1032 } 1033
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