| 1 | /* |
| 2 | * Copyright (c) 1997, 1998 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 1.18 2006/09/10 01:26:32 dillon 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/buf.h> |
| 41 | #include <sys/proc.h> |
| 42 | #include <sys/errno.h> |
| 43 | #include <sys/devicestat.h> |
| 44 | #include <sys/proc.h> |
| 45 | #include <sys/buf2.h> |
| 46 | #include <sys/thread2.h> |
| 47 | |
| 48 | #include "../cam.h" |
| 49 | #include "../cam_ccb.h" |
| 50 | #include "../cam_extend.h" |
| 51 | #include "../cam_periph.h" |
| 52 | #include "../cam_xpt_periph.h" |
| 53 | #include "../cam_debug.h" |
| 54 | |
| 55 | #include "scsi_all.h" |
| 56 | #include "scsi_message.h" |
| 57 | #include "scsi_da.h" |
| 58 | #include "scsi_pass.h" |
| 59 | |
| 60 | typedef enum { |
| 61 | PASS_FLAG_OPEN = 0x01, |
| 62 | PASS_FLAG_LOCKED = 0x02, |
| 63 | PASS_FLAG_INVALID = 0x04 |
| 64 | } pass_flags; |
| 65 | |
| 66 | typedef enum { |
| 67 | PASS_STATE_NORMAL |
| 68 | } pass_state; |
| 69 | |
| 70 | typedef enum { |
| 71 | PASS_CCB_BUFFER_IO, |
| 72 | PASS_CCB_WAITING |
| 73 | } pass_ccb_types; |
| 74 | |
| 75 | #define ccb_type ppriv_field0 |
| 76 | #define ccb_bio ppriv_ptr1 |
| 77 | |
| 78 | struct pass_softc { |
| 79 | pass_state state; |
| 80 | pass_flags flags; |
| 81 | u_int8_t pd_type; |
| 82 | struct bio_queue_head bio_queue; |
| 83 | union ccb saved_ccb; |
| 84 | struct devstat device_stats; |
| 85 | }; |
| 86 | |
| 87 | #define PASS_CDEV_MAJOR 31 |
| 88 | |
| 89 | static d_open_t passopen; |
| 90 | static d_close_t passclose; |
| 91 | static d_ioctl_t passioctl; |
| 92 | static d_strategy_t passstrategy; |
| 93 | |
| 94 | static periph_init_t passinit; |
| 95 | static periph_ctor_t passregister; |
| 96 | static periph_oninv_t passoninvalidate; |
| 97 | static periph_dtor_t passcleanup; |
| 98 | static periph_start_t passstart; |
| 99 | static void passasync(void *callback_arg, u_int32_t code, |
| 100 | struct cam_path *path, void *arg); |
| 101 | static void passdone(struct cam_periph *periph, |
| 102 | union ccb *done_ccb); |
| 103 | static int passerror(union ccb *ccb, u_int32_t cam_flags, |
| 104 | u_int32_t sense_flags); |
| 105 | static int passsendccb(struct cam_periph *periph, union ccb *ccb, |
| 106 | union ccb *inccb); |
| 107 | |
| 108 | static struct periph_driver passdriver = |
| 109 | { |
| 110 | passinit, "pass", |
| 111 | TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0 |
| 112 | }; |
| 113 | |
| 114 | DATA_SET(periphdriver_set, passdriver); |
| 115 | |
| 116 | static struct dev_ops pass_ops = { |
| 117 | { "pass", PASS_CDEV_MAJOR, 0 }, |
| 118 | .d_open = passopen, |
| 119 | .d_close = passclose, |
| 120 | .d_read = physread, |
| 121 | .d_write = physwrite, |
| 122 | .d_ioctl = passioctl, |
| 123 | .d_strategy = passstrategy, |
| 124 | }; |
| 125 | |
| 126 | static struct extend_array *passperiphs; |
| 127 | |
| 128 | static void |
| 129 | passinit(void) |
| 130 | { |
| 131 | cam_status status; |
| 132 | struct cam_path *path; |
| 133 | |
| 134 | /* |
| 135 | * Create our extend array for storing the devices we attach to. |
| 136 | */ |
| 137 | passperiphs = cam_extend_new(); |
| 138 | if (passperiphs == NULL) { |
| 139 | printf("passm: Failed to alloc extend array!\n"); |
| 140 | return; |
| 141 | } |
| 142 | |
| 143 | /* |
| 144 | * Install a global async callback. This callback will |
| 145 | * receive async callbacks like "new device found". |
| 146 | */ |
| 147 | status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, |
| 148 | CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); |
| 149 | |
| 150 | if (status == CAM_REQ_CMP) { |
| 151 | struct ccb_setasync csa; |
| 152 | |
| 153 | xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); |
| 154 | csa.ccb_h.func_code = XPT_SASYNC_CB; |
| 155 | csa.event_enable = AC_FOUND_DEVICE; |
| 156 | csa.callback = passasync; |
| 157 | csa.callback_arg = NULL; |
| 158 | xpt_action((union ccb *)&csa); |
| 159 | status = csa.ccb_h.status; |
| 160 | xpt_free_path(path); |
| 161 | } |
| 162 | |
| 163 | if (status != CAM_REQ_CMP) { |
| 164 | printf("pass: Failed to attach master async callback " |
| 165 | "due to status 0x%x!\n", status); |
| 166 | } |
| 167 | |
| 168 | } |
| 169 | |
| 170 | static void |
| 171 | passoninvalidate(struct cam_periph *periph) |
| 172 | { |
| 173 | struct pass_softc *softc; |
| 174 | struct buf *q_bp; |
| 175 | struct bio *q_bio; |
| 176 | struct ccb_setasync csa; |
| 177 | |
| 178 | softc = (struct pass_softc *)periph->softc; |
| 179 | |
| 180 | /* |
| 181 | * De-register any async callbacks. |
| 182 | */ |
| 183 | xpt_setup_ccb(&csa.ccb_h, periph->path, |
| 184 | /* priority */ 5); |
| 185 | csa.ccb_h.func_code = XPT_SASYNC_CB; |
| 186 | csa.event_enable = 0; |
| 187 | csa.callback = passasync; |
| 188 | csa.callback_arg = periph; |
| 189 | xpt_action((union ccb *)&csa); |
| 190 | |
| 191 | softc->flags |= PASS_FLAG_INVALID; |
| 192 | |
| 193 | /* |
| 194 | * We need to be in a critical section here to keep the buffer |
| 195 | * queue from being modified while we traverse it. |
| 196 | */ |
| 197 | crit_enter(); |
| 198 | |
| 199 | /* |
| 200 | * Return all queued I/O with ENXIO. |
| 201 | * XXX Handle any transactions queued to the card |
| 202 | * with XPT_ABORT_CCB. |
| 203 | */ |
| 204 | while ((q_bio = bioq_first(&softc->bio_queue)) != NULL){ |
| 205 | bioq_remove(&softc->bio_queue, q_bio); |
| 206 | q_bp = q_bio->bio_buf; |
| 207 | q_bp->b_resid = q_bp->b_bcount; |
| 208 | q_bp->b_error = ENXIO; |
| 209 | q_bp->b_flags |= B_ERROR; |
| 210 | biodone(q_bio); |
| 211 | } |
| 212 | crit_exit(); |
| 213 | |
| 214 | if (bootverbose) { |
| 215 | xpt_print_path(periph->path); |
| 216 | printf("lost device\n"); |
| 217 | } |
| 218 | |
| 219 | } |
| 220 | |
| 221 | static void |
| 222 | passcleanup(struct cam_periph *periph) |
| 223 | { |
| 224 | struct pass_softc *softc; |
| 225 | |
| 226 | softc = (struct pass_softc *)periph->softc; |
| 227 | |
| 228 | devstat_remove_entry(&softc->device_stats); |
| 229 | |
| 230 | cam_extend_release(passperiphs, periph->unit_number); |
| 231 | |
| 232 | if (bootverbose) { |
| 233 | xpt_print_path(periph->path); |
| 234 | printf("removing device entry\n"); |
| 235 | } |
| 236 | dev_ops_remove(&pass_ops, -1, periph->unit_number); |
| 237 | kfree(softc, M_DEVBUF); |
| 238 | } |
| 239 | |
| 240 | static void |
| 241 | passasync(void *callback_arg, u_int32_t code, |
| 242 | struct cam_path *path, void *arg) |
| 243 | { |
| 244 | struct cam_periph *periph; |
| 245 | |
| 246 | periph = (struct cam_periph *)callback_arg; |
| 247 | |
| 248 | switch (code) { |
| 249 | case AC_FOUND_DEVICE: |
| 250 | { |
| 251 | struct ccb_getdev *cgd; |
| 252 | cam_status status; |
| 253 | |
| 254 | cgd = (struct ccb_getdev *)arg; |
| 255 | |
| 256 | /* |
| 257 | * Allocate a peripheral instance for |
| 258 | * this device and start the probe |
| 259 | * process. |
| 260 | */ |
| 261 | status = cam_periph_alloc(passregister, passoninvalidate, |
| 262 | passcleanup, passstart, "pass", |
| 263 | CAM_PERIPH_BIO, cgd->ccb_h.path, |
| 264 | passasync, AC_FOUND_DEVICE, cgd); |
| 265 | |
| 266 | if (status != CAM_REQ_CMP |
| 267 | && status != CAM_REQ_INPROG) |
| 268 | printf("passasync: Unable to attach new device " |
| 269 | "due to status 0x%x\n", status); |
| 270 | |
| 271 | break; |
| 272 | } |
| 273 | default: |
| 274 | cam_periph_async(periph, code, path, arg); |
| 275 | break; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | static cam_status |
| 280 | passregister(struct cam_periph *periph, void *arg) |
| 281 | { |
| 282 | struct pass_softc *softc; |
| 283 | struct ccb_setasync csa; |
| 284 | struct ccb_getdev *cgd; |
| 285 | |
| 286 | cgd = (struct ccb_getdev *)arg; |
| 287 | if (periph == NULL) { |
| 288 | printf("passregister: periph was NULL!!\n"); |
| 289 | return(CAM_REQ_CMP_ERR); |
| 290 | } |
| 291 | |
| 292 | if (cgd == NULL) { |
| 293 | printf("passregister: no getdev CCB, can't register device\n"); |
| 294 | return(CAM_REQ_CMP_ERR); |
| 295 | } |
| 296 | |
| 297 | softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO); |
| 298 | softc->state = PASS_STATE_NORMAL; |
| 299 | softc->pd_type = SID_TYPE(&cgd->inq_data); |
| 300 | bioq_init(&softc->bio_queue); |
| 301 | |
| 302 | periph->softc = softc; |
| 303 | |
| 304 | cam_extend_set(passperiphs, periph->unit_number, periph); |
| 305 | /* |
| 306 | * We pass in 0 for a blocksize, since we don't |
| 307 | * know what the blocksize of this device is, if |
| 308 | * it even has a blocksize. |
| 309 | */ |
| 310 | devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, |
| 311 | 0, DEVSTAT_NO_BLOCKSIZE | DEVSTAT_NO_ORDERED_TAGS, |
| 312 | softc->pd_type | |
| 313 | DEVSTAT_TYPE_IF_SCSI | |
| 314 | DEVSTAT_TYPE_PASS, |
| 315 | DEVSTAT_PRIORITY_PASS); |
| 316 | |
| 317 | /* Register the device */ |
| 318 | dev_ops_add(&pass_ops, -1, periph->unit_number); |
| 319 | make_dev(&pass_ops, periph->unit_number, UID_ROOT, |
| 320 | GID_OPERATOR, 0600, "%s%d", periph->periph_name, |
| 321 | periph->unit_number); |
| 322 | |
| 323 | /* |
| 324 | * Add an async callback so that we get |
| 325 | * notified if this device goes away. |
| 326 | */ |
| 327 | xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5); |
| 328 | csa.ccb_h.func_code = XPT_SASYNC_CB; |
| 329 | csa.event_enable = AC_LOST_DEVICE; |
| 330 | csa.callback = passasync; |
| 331 | csa.callback_arg = periph; |
| 332 | xpt_action((union ccb *)&csa); |
| 333 | |
| 334 | if (bootverbose) |
| 335 | xpt_announce_periph(periph, NULL); |
| 336 | |
| 337 | return(CAM_REQ_CMP); |
| 338 | } |
| 339 | |
| 340 | static int |
| 341 | passopen(struct dev_open_args *ap) |
| 342 | { |
| 343 | cdev_t dev = ap->a_head.a_dev; |
| 344 | struct cam_periph *periph; |
| 345 | struct pass_softc *softc; |
| 346 | int unit, error; |
| 347 | |
| 348 | error = 0; /* default to no error */ |
| 349 | |
| 350 | /* unit = dkunit(dev); */ |
| 351 | /* XXX KDM fix this */ |
| 352 | unit = minor(dev) & 0xff; |
| 353 | |
| 354 | periph = cam_extend_get(passperiphs, unit); |
| 355 | |
| 356 | if (periph == NULL) |
| 357 | return (ENXIO); |
| 358 | |
| 359 | softc = (struct pass_softc *)periph->softc; |
| 360 | |
| 361 | crit_enter(); |
| 362 | if (softc->flags & PASS_FLAG_INVALID) { |
| 363 | crit_exit(); |
| 364 | return(ENXIO); |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Don't allow access when we're running at a high securelvel. |
| 369 | */ |
| 370 | if (securelevel > 1) { |
| 371 | crit_exit(); |
| 372 | return(EPERM); |
| 373 | } |
| 374 | |
| 375 | /* |
| 376 | * Only allow read-write access. |
| 377 | */ |
| 378 | if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0)) { |
| 379 | crit_exit(); |
| 380 | return(EPERM); |
| 381 | } |
| 382 | |
| 383 | /* |
| 384 | * We don't allow nonblocking access. |
| 385 | */ |
| 386 | if ((ap->a_oflags & O_NONBLOCK) != 0) { |
| 387 | xpt_print_path(periph->path); |
| 388 | printf("can't do nonblocking accesss\n"); |
| 389 | crit_exit(); |
| 390 | return(EINVAL); |
| 391 | } |
| 392 | |
| 393 | if ((error = cam_periph_lock(periph, PCATCH)) != 0) { |
| 394 | crit_exit(); |
| 395 | return (error); |
| 396 | } |
| 397 | |
| 398 | crit_exit(); |
| 399 | |
| 400 | if ((softc->flags & PASS_FLAG_OPEN) == 0) { |
| 401 | if (cam_periph_acquire(periph) != CAM_REQ_CMP) |
| 402 | return(ENXIO); |
| 403 | softc->flags |= PASS_FLAG_OPEN; |
| 404 | } |
| 405 | |
| 406 | cam_periph_unlock(periph); |
| 407 | |
| 408 | return (error); |
| 409 | } |
| 410 | |
| 411 | static int |
| 412 | passclose(struct dev_close_args *ap) |
| 413 | { |
| 414 | cdev_t dev = ap->a_head.a_dev; |
| 415 | struct cam_periph *periph; |
| 416 | struct pass_softc *softc; |
| 417 | int unit, error; |
| 418 | |
| 419 | /* unit = dkunit(dev); */ |
| 420 | /* XXX KDM fix this */ |
| 421 | unit = minor(dev) & 0xff; |
| 422 | |
| 423 | periph = cam_extend_get(passperiphs, unit); |
| 424 | if (periph == NULL) |
| 425 | return (ENXIO); |
| 426 | |
| 427 | softc = (struct pass_softc *)periph->softc; |
| 428 | |
| 429 | if ((error = cam_periph_lock(periph, 0)) != 0) |
| 430 | return (error); |
| 431 | |
| 432 | softc->flags &= ~PASS_FLAG_OPEN; |
| 433 | |
| 434 | cam_periph_unlock(periph); |
| 435 | cam_periph_release(periph); |
| 436 | |
| 437 | return (0); |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Actually translate the requested transfer into one the physical driver |
| 442 | * can understand. The transfer is described by a buf and will include |
| 443 | * only one physical transfer. |
| 444 | */ |
| 445 | static int |
| 446 | passstrategy(struct dev_strategy_args *ap) |
| 447 | { |
| 448 | cdev_t dev = ap->a_head.a_dev; |
| 449 | struct bio *bio = ap->a_bio; |
| 450 | struct buf *bp = bio->bio_buf; |
| 451 | struct cam_periph *periph; |
| 452 | struct pass_softc *softc; |
| 453 | u_int unit; |
| 454 | |
| 455 | /* |
| 456 | * The read/write interface for the passthrough driver doesn't |
| 457 | * really work right now. So, we just pass back EINVAL to tell the |
| 458 | * user to go away. |
| 459 | */ |
| 460 | bp->b_error = EINVAL; |
| 461 | goto bad; |
| 462 | |
| 463 | /* unit = dkunit(dev); */ |
| 464 | /* XXX KDM fix this */ |
| 465 | unit = minor(dev) & 0xff; |
| 466 | |
| 467 | periph = cam_extend_get(passperiphs, unit); |
| 468 | if (periph == NULL) { |
| 469 | bp->b_error = ENXIO; |
| 470 | goto bad; |
| 471 | } |
| 472 | softc = (struct pass_softc *)periph->softc; |
| 473 | |
| 474 | /* |
| 475 | * Odd number of bytes or negative offset |
| 476 | */ |
| 477 | /* valid request? */ |
| 478 | if (bio->bio_offset < 0) { |
| 479 | bp->b_error = EINVAL; |
| 480 | goto bad; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Mask interrupts so that the pack cannot be invalidated until |
| 485 | * after we are in the queue. Otherwise, we might not properly |
| 486 | * clean up one of the buffers. |
| 487 | */ |
| 488 | crit_enter(); |
| 489 | bioq_insert_tail(&softc->bio_queue, bio); |
| 490 | crit_exit(); |
| 491 | |
| 492 | /* |
| 493 | * Schedule ourselves for performing the work. |
| 494 | */ |
| 495 | xpt_schedule(periph, /* XXX priority */1); |
| 496 | |
| 497 | return(0); |
| 498 | bad: |
| 499 | bp->b_flags |= B_ERROR; |
| 500 | |
| 501 | /* |
| 502 | * Correctly set the buf to indicate a completed xfer |
| 503 | */ |
| 504 | bp->b_resid = bp->b_bcount; |
| 505 | biodone(bio); |
| 506 | return(0); |
| 507 | } |
| 508 | |
| 509 | static void |
| 510 | passstart(struct cam_periph *periph, union ccb *start_ccb) |
| 511 | { |
| 512 | struct pass_softc *softc; |
| 513 | |
| 514 | softc = (struct pass_softc *)periph->softc; |
| 515 | |
| 516 | switch (softc->state) { |
| 517 | case PASS_STATE_NORMAL: |
| 518 | { |
| 519 | struct buf *bp; |
| 520 | struct bio *bio; |
| 521 | |
| 522 | crit_enter(); |
| 523 | bio = bioq_first(&softc->bio_queue); |
| 524 | if (periph->immediate_priority <= periph->pinfo.priority) { |
| 525 | start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING; |
| 526 | SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, |
| 527 | periph_links.sle); |
| 528 | periph->immediate_priority = CAM_PRIORITY_NONE; |
| 529 | crit_exit(); |
| 530 | wakeup(&periph->ccb_list); |
| 531 | } else if (bio == NULL) { |
| 532 | crit_exit(); |
| 533 | xpt_release_ccb(start_ccb); |
| 534 | } else { |
| 535 | |
| 536 | bioq_remove(&softc->bio_queue, bio); |
| 537 | bp = bio->bio_buf; |
| 538 | |
| 539 | devstat_start_transaction(&softc->device_stats); |
| 540 | |
| 541 | /* |
| 542 | * XXX JGibbs - |
| 543 | * Interpret the contents of the bp as a CCB |
| 544 | * and pass it to a routine shared by our ioctl |
| 545 | * code and passtart. |
| 546 | * For now, just biodone it with EIO so we don't |
| 547 | * hang. |
| 548 | */ |
| 549 | bp->b_error = EIO; |
| 550 | bp->b_flags |= B_ERROR; |
| 551 | bp->b_resid = bp->b_bcount; |
| 552 | biodone(bio); |
| 553 | bio = bioq_first(&softc->bio_queue); |
| 554 | crit_exit(); |
| 555 | |
| 556 | xpt_action(start_ccb); |
| 557 | |
| 558 | } |
| 559 | if (bio != NULL) { |
| 560 | /* Have more work to do, so ensure we stay scheduled */ |
| 561 | xpt_schedule(periph, /* XXX priority */1); |
| 562 | } |
| 563 | break; |
| 564 | } |
| 565 | } |
| 566 | } |
| 567 | static void |
| 568 | passdone(struct cam_periph *periph, union ccb *done_ccb) |
| 569 | { |
| 570 | struct pass_softc *softc; |
| 571 | struct ccb_scsiio *csio; |
| 572 | |
| 573 | softc = (struct pass_softc *)periph->softc; |
| 574 | csio = &done_ccb->csio; |
| 575 | switch (csio->ccb_h.ccb_type) { |
| 576 | case PASS_CCB_BUFFER_IO: |
| 577 | { |
| 578 | struct bio *bio; |
| 579 | struct buf *bp; |
| 580 | cam_status status; |
| 581 | u_int8_t scsi_status; |
| 582 | devstat_trans_flags ds_flags; |
| 583 | |
| 584 | status = done_ccb->ccb_h.status; |
| 585 | scsi_status = done_ccb->csio.scsi_status; |
| 586 | bio = (struct bio *)done_ccb->ccb_h.ccb_bio; |
| 587 | bp = bio->bio_buf; |
| 588 | |
| 589 | /* XXX handle errors */ |
| 590 | if (!(((status & CAM_STATUS_MASK) == CAM_REQ_CMP) |
| 591 | && (scsi_status == SCSI_STATUS_OK))) { |
| 592 | int error; |
| 593 | |
| 594 | if ((error = passerror(done_ccb, 0, 0)) == ERESTART) { |
| 595 | /* |
| 596 | * A retry was scheuled, so |
| 597 | * just return. |
| 598 | */ |
| 599 | return; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * XXX unfreeze the queue after we complete |
| 604 | * the abort process |
| 605 | */ |
| 606 | bp->b_error = error; |
| 607 | bp->b_flags |= B_ERROR; |
| 608 | } |
| 609 | |
| 610 | if ((done_ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) |
| 611 | ds_flags = DEVSTAT_READ; |
| 612 | else if ((done_ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) |
| 613 | ds_flags = DEVSTAT_WRITE; |
| 614 | else |
| 615 | ds_flags = DEVSTAT_NO_DATA; |
| 616 | |
| 617 | devstat_end_transaction_buf(&softc->device_stats, bp); |
| 618 | biodone(bio); |
| 619 | break; |
| 620 | } |
| 621 | case PASS_CCB_WAITING: |
| 622 | { |
| 623 | /* Caller will release the CCB */ |
| 624 | wakeup(&done_ccb->ccb_h.cbfcnp); |
| 625 | return; |
| 626 | } |
| 627 | } |
| 628 | xpt_release_ccb(done_ccb); |
| 629 | } |
| 630 | |
| 631 | static int |
| 632 | passioctl(struct dev_ioctl_args *ap) |
| 633 | { |
| 634 | cdev_t dev = ap->a_head.a_dev; |
| 635 | caddr_t addr = ap->a_data; |
| 636 | struct cam_periph *periph; |
| 637 | struct pass_softc *softc; |
| 638 | u_int8_t unit; |
| 639 | int error; |
| 640 | |
| 641 | |
| 642 | /* unit = dkunit(dev); */ |
| 643 | /* XXX KDM fix this */ |
| 644 | unit = minor(dev) & 0xff; |
| 645 | |
| 646 | periph = cam_extend_get(passperiphs, unit); |
| 647 | |
| 648 | if (periph == NULL) |
| 649 | return(ENXIO); |
| 650 | |
| 651 | softc = (struct pass_softc *)periph->softc; |
| 652 | |
| 653 | error = 0; |
| 654 | |
| 655 | switch (ap->a_cmd) { |
| 656 | |
| 657 | case CAMIOCOMMAND: |
| 658 | { |
| 659 | union ccb *inccb; |
| 660 | union ccb *ccb; |
| 661 | int ccb_malloced; |
| 662 | |
| 663 | inccb = (union ccb *)addr; |
| 664 | |
| 665 | /* |
| 666 | * Some CCB types, like scan bus and scan lun can only go |
| 667 | * through the transport layer device. |
| 668 | */ |
| 669 | if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) { |
| 670 | xpt_print_path(periph->path); |
| 671 | printf("CCB function code %#x is restricted to the " |
| 672 | "XPT device\n", inccb->ccb_h.func_code); |
| 673 | error = ENODEV; |
| 674 | break; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * Non-immediate CCBs need a CCB from the per-device pool |
| 679 | * of CCBs, which is scheduled by the transport layer. |
| 680 | * Immediate CCBs and user-supplied CCBs should just be |
| 681 | * malloced. |
| 682 | */ |
| 683 | if ((inccb->ccb_h.func_code & XPT_FC_QUEUED) |
| 684 | && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) { |
| 685 | ccb = cam_periph_getccb(periph, |
| 686 | inccb->ccb_h.pinfo.priority); |
| 687 | ccb_malloced = 0; |
| 688 | } else { |
| 689 | ccb = xpt_alloc_ccb(); |
| 690 | |
| 691 | if (ccb != NULL) |
| 692 | xpt_setup_ccb(&ccb->ccb_h, periph->path, |
| 693 | inccb->ccb_h.pinfo.priority); |
| 694 | ccb_malloced = 1; |
| 695 | } |
| 696 | |
| 697 | if (ccb == NULL) { |
| 698 | xpt_print_path(periph->path); |
| 699 | printf("unable to allocate CCB\n"); |
| 700 | error = ENOMEM; |
| 701 | break; |
| 702 | } |
| 703 | |
| 704 | error = passsendccb(periph, ccb, inccb); |
| 705 | |
| 706 | if (ccb_malloced) |
| 707 | xpt_free_ccb(ccb); |
| 708 | else |
| 709 | xpt_release_ccb(ccb); |
| 710 | |
| 711 | break; |
| 712 | } |
| 713 | default: |
| 714 | error = cam_periph_ioctl(periph, ap->a_cmd, addr, passerror); |
| 715 | break; |
| 716 | } |
| 717 | |
| 718 | return(error); |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * Generally, "ccb" should be the CCB supplied by the kernel. "inccb" |
| 723 | * should be the CCB that is copied in from the user. |
| 724 | */ |
| 725 | static int |
| 726 | passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb) |
| 727 | { |
| 728 | struct pass_softc *softc; |
| 729 | struct cam_periph_map_info mapinfo; |
| 730 | int error, need_unmap; |
| 731 | |
| 732 | softc = (struct pass_softc *)periph->softc; |
| 733 | |
| 734 | need_unmap = 0; |
| 735 | |
| 736 | /* |
| 737 | * There are some fields in the CCB header that need to be |
| 738 | * preserved, the rest we get from the user. |
| 739 | */ |
| 740 | xpt_merge_ccb(ccb, inccb); |
| 741 | |
| 742 | /* |
| 743 | * There's no way for the user to have a completion |
| 744 | * function, so we put our own completion function in here. |
| 745 | */ |
| 746 | ccb->ccb_h.cbfcnp = passdone; |
| 747 | |
| 748 | /* |
| 749 | * We only attempt to map the user memory into kernel space |
| 750 | * if they haven't passed in a physical memory pointer, |
| 751 | * and if there is actually an I/O operation to perform. |
| 752 | * Right now cam_periph_mapmem() only supports SCSI and device |
| 753 | * match CCBs. For the SCSI CCBs, we only pass the CCB in if |
| 754 | * there's actually data to map. cam_periph_mapmem() will do the |
| 755 | * right thing, even if there isn't data to map, but since CCBs |
| 756 | * without data are a reasonably common occurance (e.g. test unit |
| 757 | * ready), it will save a few cycles if we check for it here. |
| 758 | */ |
| 759 | if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0) |
| 760 | && (((ccb->ccb_h.func_code == XPT_SCSI_IO) |
| 761 | && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE)) |
| 762 | || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) { |
| 763 | |
| 764 | bzero(&mapinfo, sizeof(mapinfo)); |
| 765 | |
| 766 | error = cam_periph_mapmem(ccb, &mapinfo); |
| 767 | |
| 768 | /* |
| 769 | * cam_periph_mapmem returned an error, we can't continue. |
| 770 | * Return the error to the user. |
| 771 | */ |
| 772 | if (error) |
| 773 | return(error); |
| 774 | |
| 775 | /* |
| 776 | * We successfully mapped the memory in, so we need to |
| 777 | * unmap it when the transaction is done. |
| 778 | */ |
| 779 | need_unmap = 1; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * If the user wants us to perform any error recovery, then honor |
| 784 | * that request. Otherwise, it's up to the user to perform any |
| 785 | * error recovery. |
| 786 | */ |
| 787 | error = cam_periph_runccb(ccb, |
| 788 | (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ? |
| 789 | passerror : NULL, |
| 790 | /* cam_flags */ 0, |
| 791 | /* sense_flags */SF_RETRY_UA | SF_RETRY_SELTO, |
| 792 | &softc->device_stats); |
| 793 | |
| 794 | if (need_unmap != 0) |
| 795 | cam_periph_unmapmem(ccb, &mapinfo); |
| 796 | |
| 797 | ccb->ccb_h.cbfcnp = NULL; |
| 798 | ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv; |
| 799 | bcopy(ccb, inccb, sizeof(union ccb)); |
| 800 | |
| 801 | return(error); |
| 802 | } |
| 803 | |
| 804 | static int |
| 805 | passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) |
| 806 | { |
| 807 | struct cam_periph *periph; |
| 808 | struct pass_softc *softc; |
| 809 | |
| 810 | periph = xpt_path_periph(ccb->ccb_h.path); |
| 811 | softc = (struct pass_softc *)periph->softc; |
| 812 | |
| 813 | return(cam_periph_error(ccb, cam_flags, sense_flags, |
| 814 | &softc->saved_ccb)); |
| 815 | } |