1 /* 2 * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs. 3 * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions, and the following disclaimer, 11 * without modification, immediately at the beginning of the file. 12 * 2. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD: src/sys/cam/scsi/scsi_pass.c,v 1.19 2000/01/17 06:27:37 mjacob Exp $ 28 * $DragonFly: src/sys/bus/cam/scsi/scsi_pass.c,v 1.27 2008/05/18 20:30:20 pavalos Exp $ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/types.h> 35 #include <sys/buf.h> 36 #include <sys/malloc.h> 37 #include <sys/fcntl.h> 38 #include <sys/stat.h> 39 #include <sys/conf.h> 40 #include <sys/errno.h> 41 #include <sys/devicestat.h> 42 #include <sys/buf2.h> 43 #include <sys/thread2.h> 44 45 #include "../cam.h" 46 #include "../cam_ccb.h" 47 #include "../cam_extend.h" 48 #include "../cam_periph.h" 49 #include "../cam_queue.h" 50 #include "../cam_xpt_periph.h" 51 #include "../cam_debug.h" 52 #include "../cam_sim.h" 53 54 #include "scsi_all.h" 55 #include "scsi_message.h" 56 #include "scsi_da.h" 57 #include "scsi_pass.h" 58 59 typedef enum { 60 PASS_FLAG_OPEN = 0x01, 61 PASS_FLAG_LOCKED = 0x02, 62 PASS_FLAG_INVALID = 0x04 63 } pass_flags; 64 65 typedef enum { 66 PASS_STATE_NORMAL 67 } pass_state; 68 69 typedef enum { 70 PASS_CCB_BUFFER_IO, 71 PASS_CCB_WAITING 72 } pass_ccb_types; 73 74 #define ccb_type ppriv_field0 75 #define ccb_bio ppriv_ptr1 76 77 struct pass_softc { 78 pass_state state; 79 pass_flags flags; 80 u_int8_t pd_type; 81 union ccb saved_ccb; 82 struct devstat device_stats; 83 }; 84 85 #define PASS_CDEV_MAJOR 31 86 87 static d_open_t passopen; 88 static d_close_t passclose; 89 static d_ioctl_t passioctl; 90 91 static periph_init_t passinit; 92 static periph_ctor_t passregister; 93 static periph_oninv_t passoninvalidate; 94 static periph_dtor_t passcleanup; 95 static periph_start_t passstart; 96 static void passasync(void *callback_arg, u_int32_t code, 97 struct cam_path *path, void *arg); 98 static void passdone(struct cam_periph *periph, 99 union ccb *done_ccb); 100 static int passerror(union ccb *ccb, u_int32_t cam_flags, 101 u_int32_t sense_flags); 102 static int passsendccb(struct cam_periph *periph, union ccb *ccb, 103 union ccb *inccb); 104 105 static struct periph_driver passdriver = 106 { 107 passinit, "pass", 108 TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0 109 }; 110 111 PERIPHDRIVER_DECLARE(pass, passdriver); 112 113 static struct dev_ops pass_ops = { 114 { "pass", PASS_CDEV_MAJOR, 0 }, 115 .d_open = passopen, 116 .d_close = passclose, 117 .d_read = noread, 118 .d_write = nowrite, 119 .d_ioctl = passioctl, 120 .d_strategy = nostrategy, 121 }; 122 123 static struct extend_array *passperiphs; 124 125 static void 126 passinit(void) 127 { 128 cam_status status; 129 130 /* 131 * Create our extend array for storing the devices we attach to. 132 */ 133 passperiphs = cam_extend_new(); 134 if (passperiphs == NULL) { 135 kprintf("passm: Failed to alloc extend array!\n"); 136 return; 137 } 138 139 /* 140 * Install a global async callback. This callback will 141 * receive async callbacks like "new device found". 142 */ 143 status = xpt_register_async(AC_FOUND_DEVICE, passasync, NULL, NULL); 144 145 if (status != CAM_REQ_CMP) { 146 kprintf("pass: Failed to attach master async callback " 147 "due to status 0x%x!\n", status); 148 } 149 150 } 151 152 static void 153 passoninvalidate(struct cam_periph *periph) 154 { 155 struct pass_softc *softc; 156 157 softc = (struct pass_softc *)periph->softc; 158 159 /* 160 * De-register any async callbacks. 161 */ 162 xpt_register_async(0, passasync, periph, periph->path); 163 164 softc->flags |= PASS_FLAG_INVALID; 165 166 if (bootverbose) { 167 xpt_print(periph->path, "lost device\n"); 168 } 169 170 } 171 172 static void 173 passcleanup(struct cam_periph *periph) 174 { 175 struct pass_softc *softc; 176 177 softc = (struct pass_softc *)periph->softc; 178 179 devstat_remove_entry(&softc->device_stats); 180 181 cam_extend_release(passperiphs, periph->unit_number); 182 183 if (bootverbose) { 184 xpt_print(periph->path, "removing device entry\n"); 185 } 186 dev_ops_remove(&pass_ops, -1, periph->unit_number); 187 kfree(softc, M_DEVBUF); 188 } 189 190 static void 191 passasync(void *callback_arg, u_int32_t code, 192 struct cam_path *path, void *arg) 193 { 194 struct cam_periph *periph; 195 struct cam_sim *sim; 196 197 periph = (struct cam_periph *)callback_arg; 198 199 switch (code) { 200 case AC_FOUND_DEVICE: 201 { 202 struct ccb_getdev *cgd; 203 cam_status status; 204 205 cgd = (struct ccb_getdev *)arg; 206 if (cgd == NULL) 207 break; 208 209 /* 210 * Don't complain if a valid peripheral is already attached. 211 */ 212 periph = cam_periph_find(cgd->ccb_h.path, "pass"); 213 if (periph && (periph->flags & CAM_PERIPH_INVALID) == 0) 214 break; 215 216 /* 217 * Allocate a peripheral instance for 218 * this device and start the probe 219 * process. 220 */ 221 sim = xpt_path_sim(cgd->ccb_h.path); 222 status = cam_periph_alloc(passregister, passoninvalidate, 223 passcleanup, passstart, "pass", 224 CAM_PERIPH_BIO, cgd->ccb_h.path, 225 passasync, AC_FOUND_DEVICE, cgd); 226 227 if (status != CAM_REQ_CMP && status != CAM_REQ_INPROG) { 228 const struct cam_status_entry *entry; 229 230 entry = cam_fetch_status_entry(status); 231 232 kprintf("passasync: Unable to attach new device " 233 "due to status %#x: %s\n", status, entry ? 234 entry->status_text : "Unknown"); 235 } 236 237 break; 238 } 239 default: 240 cam_periph_async(periph, code, path, arg); 241 break; 242 } 243 } 244 245 static cam_status 246 passregister(struct cam_periph *periph, void *arg) 247 { 248 struct pass_softc *softc; 249 struct ccb_getdev *cgd; 250 int no_tags; 251 252 cgd = (struct ccb_getdev *)arg; 253 if (periph == NULL) { 254 kprintf("passregister: periph was NULL!!\n"); 255 return(CAM_REQ_CMP_ERR); 256 } 257 258 if (cgd == NULL) { 259 kprintf("passregister: no getdev CCB, can't register device\n"); 260 return(CAM_REQ_CMP_ERR); 261 } 262 263 softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO); 264 softc->state = PASS_STATE_NORMAL; 265 softc->pd_type = SID_TYPE(&cgd->inq_data); 266 267 periph->softc = softc; 268 cam_extend_set(passperiphs, periph->unit_number, periph); 269 270 /* 271 * We pass in 0 for a blocksize, since we don't 272 * know what the blocksize of this device is, if 273 * it even has a blocksize. 274 */ 275 CAM_SIM_UNLOCK(periph->sim); 276 no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0; 277 devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, 0, 278 DEVSTAT_NO_BLOCKSIZE 279 | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0), 280 softc->pd_type | 281 DEVSTAT_TYPE_IF_SCSI | 282 DEVSTAT_TYPE_PASS, 283 DEVSTAT_PRIORITY_PASS); 284 285 /* Register the device */ 286 dev_ops_add(&pass_ops, -1, periph->unit_number); 287 make_dev(&pass_ops, periph->unit_number, UID_ROOT, 288 GID_OPERATOR, 0600, "%s%d", periph->periph_name, 289 periph->unit_number); 290 CAM_SIM_LOCK(periph->sim); 291 /* 292 * Add an async callback so that we get 293 * notified if this device goes away. 294 */ 295 xpt_register_async(AC_LOST_DEVICE, passasync, periph, periph->path); 296 297 if (bootverbose) 298 xpt_announce_periph(periph, NULL); 299 300 return(CAM_REQ_CMP); 301 } 302 303 static int 304 passopen(struct dev_open_args *ap) 305 { 306 cdev_t dev = ap->a_head.a_dev; 307 struct cam_periph *periph; 308 struct pass_softc *softc; 309 int unit, error; 310 311 error = 0; /* default to no error */ 312 313 /* unit = dkunit(dev); */ 314 /* XXX KDM fix this */ 315 unit = minor(dev) & 0xff; 316 317 periph = cam_extend_get(passperiphs, unit); 318 319 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 320 return (ENXIO); 321 322 cam_periph_lock(periph); 323 324 softc = (struct pass_softc *)periph->softc; 325 326 if (softc->flags & PASS_FLAG_INVALID) { 327 cam_periph_unlock(periph); 328 cam_periph_release(periph); 329 return(ENXIO); 330 } 331 332 /* 333 * Don't allow access when we're running at a high securelevel. 334 */ 335 if (securelevel > 1) { 336 cam_periph_unlock(periph); 337 cam_periph_release(periph); 338 return(EPERM); 339 } 340 341 /* 342 * Only allow read-write access. 343 */ 344 if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0)) { 345 cam_periph_unlock(periph); 346 cam_periph_release(periph); 347 return(EPERM); 348 } 349 350 /* 351 * We don't allow nonblocking access. 352 */ 353 if ((ap->a_oflags & O_NONBLOCK) != 0) { 354 xpt_print(periph->path, "can't do nonblocking access\n"); 355 cam_periph_unlock(periph); 356 cam_periph_release(periph); 357 return(EINVAL); 358 } 359 360 if ((softc->flags & PASS_FLAG_OPEN) == 0) { 361 softc->flags |= PASS_FLAG_OPEN; 362 } else { 363 /* Device closes aren't symmertical, so fix up the refcount */ 364 cam_periph_release(periph); 365 } 366 367 cam_periph_unlock(periph); 368 369 return (error); 370 } 371 372 static int 373 passclose(struct dev_close_args *ap) 374 { 375 cdev_t dev = ap->a_head.a_dev; 376 struct cam_periph *periph; 377 struct pass_softc *softc; 378 int unit; 379 380 /* unit = dkunit(dev); */ 381 /* XXX KDM fix this */ 382 unit = minor(dev) & 0xff; 383 384 periph = cam_extend_get(passperiphs, unit); 385 if (periph == NULL) 386 return (ENXIO); 387 388 cam_periph_lock(periph); 389 390 softc = (struct pass_softc *)periph->softc; 391 softc->flags &= ~PASS_FLAG_OPEN; 392 393 cam_periph_unlock(periph); 394 cam_periph_release(periph); 395 396 return (0); 397 } 398 399 static void 400 passstart(struct cam_periph *periph, union ccb *start_ccb) 401 { 402 struct pass_softc *softc; 403 404 softc = (struct pass_softc *)periph->softc; 405 406 switch (softc->state) { 407 case PASS_STATE_NORMAL: 408 start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING; 409 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 410 periph_links.sle); 411 periph->immediate_priority = CAM_PRIORITY_NONE; 412 wakeup(&periph->ccb_list); 413 break; 414 } 415 } 416 417 static void 418 passdone(struct cam_periph *periph, union ccb *done_ccb) 419 { 420 struct pass_softc *softc; 421 struct ccb_scsiio *csio; 422 423 softc = (struct pass_softc *)periph->softc; 424 csio = &done_ccb->csio; 425 switch (csio->ccb_h.ccb_type) { 426 case PASS_CCB_WAITING: 427 /* Caller will release the CCB */ 428 wakeup(&done_ccb->ccb_h.cbfcnp); 429 return; 430 } 431 xpt_release_ccb(done_ccb); 432 } 433 434 static int 435 passioctl(struct dev_ioctl_args *ap) 436 { 437 cdev_t dev = ap->a_head.a_dev; 438 caddr_t addr = ap->a_data; 439 struct cam_periph *periph; 440 struct pass_softc *softc; 441 u_int8_t unit; 442 int error; 443 444 445 /* unit = dkunit(dev); */ 446 /* XXX KDM fix this */ 447 unit = minor(dev) & 0xff; 448 449 periph = cam_extend_get(passperiphs, unit); 450 451 if (periph == NULL) 452 return(ENXIO); 453 454 cam_periph_lock(periph); 455 softc = (struct pass_softc *)periph->softc; 456 457 error = 0; 458 459 switch (ap->a_cmd) { 460 461 case CAMIOCOMMAND: 462 { 463 union ccb *inccb; 464 union ccb *ccb; 465 int ccb_malloced; 466 467 inccb = (union ccb *)addr; 468 469 /* 470 * Some CCB types, like scan bus and scan lun can only go 471 * through the transport layer device. 472 */ 473 if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) { 474 xpt_print(periph->path, "CCB function code %#x is " 475 "restricted to the XPT device\n", 476 inccb->ccb_h.func_code); 477 error = ENODEV; 478 break; 479 } 480 481 /* 482 * Non-immediate CCBs need a CCB from the per-device pool 483 * of CCBs, which is scheduled by the transport layer. 484 * Immediate CCBs and user-supplied CCBs should just be 485 * malloced. 486 */ 487 if ((inccb->ccb_h.func_code & XPT_FC_QUEUED) 488 && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) { 489 ccb = cam_periph_getccb(periph, 490 inccb->ccb_h.pinfo.priority); 491 ccb_malloced = 0; 492 } else { 493 ccb = xpt_alloc_ccb(); 494 495 if (ccb != NULL) 496 xpt_setup_ccb(&ccb->ccb_h, periph->path, 497 inccb->ccb_h.pinfo.priority); 498 ccb_malloced = 1; 499 } 500 501 if (ccb == NULL) { 502 xpt_print(periph->path, "unable to allocate CCB\n"); 503 error = ENOMEM; 504 break; 505 } 506 507 error = passsendccb(periph, ccb, inccb); 508 509 if (ccb_malloced) 510 xpt_free_ccb(ccb); 511 else 512 xpt_release_ccb(ccb); 513 514 break; 515 } 516 default: 517 error = cam_periph_ioctl(periph, ap->a_cmd, addr, passerror); 518 break; 519 } 520 521 cam_periph_unlock(periph); 522 return(error); 523 } 524 525 /* 526 * Generally, "ccb" should be the CCB supplied by the kernel. "inccb" 527 * should be the CCB that is copied in from the user. 528 */ 529 static int 530 passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb) 531 { 532 struct pass_softc *softc; 533 struct cam_periph_map_info mapinfo; 534 int error, need_unmap; 535 536 softc = (struct pass_softc *)periph->softc; 537 538 need_unmap = 0; 539 540 /* 541 * There are some fields in the CCB header that need to be 542 * preserved, the rest we get from the user. 543 */ 544 xpt_merge_ccb(ccb, inccb); 545 546 /* 547 * There's no way for the user to have a completion 548 * function, so we put our own completion function in here. 549 */ 550 ccb->ccb_h.cbfcnp = passdone; 551 552 /* 553 * We only attempt to map the user memory into kernel space 554 * if they haven't passed in a physical memory pointer, 555 * and if there is actually an I/O operation to perform. 556 * Right now cam_periph_mapmem() only supports SCSI and device 557 * match CCBs. For the SCSI CCBs, we only pass the CCB in if 558 * there's actually data to map. cam_periph_mapmem() will do the 559 * right thing, even if there isn't data to map, but since CCBs 560 * without data are a reasonably common occurance (e.g. test unit 561 * ready), it will save a few cycles if we check for it here. 562 */ 563 if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) 564 && (((ccb->ccb_h.func_code == XPT_SCSI_IO) 565 && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)) 566 || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) { 567 568 bzero(&mapinfo, sizeof(mapinfo)); 569 570 /* 571 * cam_periph_mapmem calls into proc and vm functions that can 572 * sleep as well as trigger I/O, so we can't hold the lock. 573 * Dropping it here is reasonably safe. 574 */ 575 cam_periph_unlock(periph); 576 error = cam_periph_mapmem(ccb, &mapinfo); 577 cam_periph_lock(periph); 578 579 /* 580 * cam_periph_mapmem returned an error, we can't continue. 581 * Return the error to the user. 582 */ 583 if (error) 584 return(error); 585 586 /* 587 * We successfully mapped the memory in, so we need to 588 * unmap it when the transaction is done. 589 */ 590 need_unmap = 1; 591 } 592 593 /* 594 * If the user wants us to perform any error recovery, then honor 595 * that request. Otherwise, it's up to the user to perform any 596 * error recovery. 597 */ 598 error = cam_periph_runccb(ccb, 599 (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ? 600 passerror : NULL, 601 /* cam_flags */ CAM_RETRY_SELTO, 602 /* sense_flags */SF_RETRY_UA, 603 &softc->device_stats); 604 605 if (need_unmap != 0) 606 cam_periph_unmapmem(ccb, &mapinfo); 607 608 ccb->ccb_h.cbfcnp = NULL; 609 ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv; 610 bcopy(ccb, inccb, sizeof(union ccb)); 611 612 return(error); 613 } 614 615 static int 616 passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 617 { 618 struct cam_periph *periph; 619 struct pass_softc *softc; 620 621 periph = xpt_path_periph(ccb->ccb_h.path); 622 softc = (struct pass_softc *)periph->softc; 623 624 return(cam_periph_error(ccb, cam_flags, sense_flags, 625 &softc->saved_ccb)); 626 } 627