32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/conf.h>
37#include <sys/malloc.h>
38#include <sys/poll.h>
39#include <sys/vnode.h>
40#include <sys/lock.h>
41#include <sys/mutex.h>
42#include <sys/devicestat.h>
43
44#include <cam/cam.h>
45#include <cam/cam_ccb.h>
46#include <cam/cam_periph.h>
47#include <cam/cam_xpt_periph.h>
48#include <cam/scsi/scsi_targetio.h>
49
50/* Transaction information attached to each CCB sent by the user */
51struct targ_cmd_descr {
52 struct cam_periph_map_info mapinfo;
53 TAILQ_ENTRY(targ_cmd_descr) tqe;
54 union ccb *user_ccb;
55 int priority;
56 int func_code;
57};
58
59/* Offset into the private CCB area for storing our descriptor */
60#define targ_descr periph_priv.entries[1].ptr
61
62TAILQ_HEAD(descr_queue, targ_cmd_descr);
63
64typedef enum {
65 TARG_STATE_RESV = 0x00, /* Invalid state */
66 TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */
67 TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */
68} targ_state;
69
70/* Per-instance device software context */
71struct targ_softc {
72 /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
73 struct ccb_queue pending_ccb_queue;
74
75 /* Command descriptors awaiting CTIO resources from the XPT */
76 struct descr_queue work_queue;
77
78 /* Command descriptors that have been aborted back to the user. */
79 struct descr_queue abort_queue;
80
81 /*
82 * Queue of CCBs that have been copied out to userland, but our
83 * userland daemon has not yet seen.
84 */
85 struct ccb_queue user_ccb_queue;
86
87 struct cam_periph *periph;
88 struct cam_path *path;
89 targ_state state;
90 struct selinfo read_select;
91 struct devstat device_stats;
92 struct mtx mtx;
93};
94
95static d_open_t targopen;
96static d_close_t targclose;
97static d_read_t targread;
98static d_write_t targwrite;
99static d_ioctl_t targioctl;
100static d_poll_t targpoll;
101static d_kqfilter_t targkqfilter;
102static void targreadfiltdetach(struct knote *kn);
103static int targreadfilt(struct knote *kn, long hint);
104static struct filterops targread_filtops =
105 { 1, NULL, targreadfiltdetach, targreadfilt };
106
107static struct cdevsw targ_cdevsw = {
108 .d_version = D_VERSION,
109 .d_flags = D_NEEDGIANT,
110 .d_open = targopen,
111 .d_close = targclose,
112 .d_read = targread,
113 .d_write = targwrite,
114 .d_ioctl = targioctl,
115 .d_poll = targpoll,
116 .d_name = "targ",
117 .d_kqfilter = targkqfilter
118};
119
120static cam_status targendislun(struct cam_path *path, int enable,
121 int grp6_len, int grp7_len);
122static cam_status targenable(struct targ_softc *softc,
123 struct cam_path *path,
124 int grp6_len, int grp7_len);
125static cam_status targdisable(struct targ_softc *softc);
126static periph_ctor_t targctor;
127static periph_dtor_t targdtor;
128static periph_start_t targstart;
129static int targusermerge(struct targ_softc *softc,
130 struct targ_cmd_descr *descr,
131 union ccb *ccb);
132static int targsendccb(struct targ_softc *softc, union ccb *ccb,
133 struct targ_cmd_descr *descr);
134static void targdone(struct cam_periph *periph,
135 union ccb *done_ccb);
136static int targreturnccb(struct targ_softc *softc,
137 union ccb *ccb);
138static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type,
139 int priority);
140static void targfreeccb(struct targ_softc *softc, union ccb *ccb);
141static struct targ_cmd_descr *
142 targgetdescr(struct targ_softc *softc);
143static periph_init_t targinit;
144static void targclone(void *arg, char *name, int namelen,
145 struct cdev **dev);
146static void targasync(void *callback_arg, u_int32_t code,
147 struct cam_path *path, void *arg);
148static void abort_all_pending(struct targ_softc *softc);
149static void notify_user(struct targ_softc *softc);
150static int targcamstatus(cam_status status);
151static size_t targccblen(xpt_opcode func_code);
152
153static struct periph_driver targdriver =
154{
155 targinit, "targ",
156 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
157};
158PERIPHDRIVER_DECLARE(targ, targdriver);
159
160static struct mtx targ_mtx;
161#define TARG_LOCK(softc) mtx_lock(&(softc)->mtx)
162#define TARG_UNLOCK(softc) mtx_unlock(&(softc)->mtx)
163
164static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
165
166/* Create softc and initialize it. Only one proc can open each targ device. */
167static int
168targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
169{
170 struct targ_softc *softc;
171
172 mtx_lock(&targ_mtx);
173 if (dev->si_drv1 != 0) {
174 mtx_unlock(&targ_mtx);
175 return (EBUSY);
176 }
177
178 /* Mark device busy before any potentially blocking operations */
179 dev->si_drv1 = (void *)~0;
180 mtx_unlock(&targ_mtx);
181
182 /* Create the targ device, allocate its softc, initialize it */
183 if ((dev->si_flags & SI_NAMED) == 0) {
184 make_dev(&targ_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 0600,
185 "targ%d", dev2unit(dev));
186 }
187 MALLOC(softc, struct targ_softc *, sizeof(*softc), M_TARG,
188 M_WAITOK | M_ZERO);
189 dev->si_drv1 = softc;
190 softc->state = TARG_STATE_OPENED;
191 softc->periph = NULL;
192 softc->path = NULL;
193 mtx_init(&softc->mtx, devtoname(dev), "targ cdev", MTX_DEF);
194
195 TAILQ_INIT(&softc->pending_ccb_queue);
196 TAILQ_INIT(&softc->work_queue);
197 TAILQ_INIT(&softc->abort_queue);
198 TAILQ_INIT(&softc->user_ccb_queue);
199 knlist_init(&softc->read_select.si_note, &softc->mtx);
200
201 return (0);
202}
203
204/* Disable LUN if enabled and teardown softc */
205static int
206targclose(struct cdev *dev, int flag, int fmt, struct thread *td)
207{
208 struct targ_softc *softc;
209 int error;
210
211 softc = (struct targ_softc *)dev->si_drv1;
212 TARG_LOCK(softc);
213 error = targdisable(softc);
214 if (error == CAM_REQ_CMP) {
215 dev->si_drv1 = 0;
216 mtx_lock(&targ_mtx);
217 if (softc->periph != NULL) {
218 cam_periph_invalidate(softc->periph);
219 softc->periph = NULL;
220 }
221 mtx_unlock(&targ_mtx);
222 TARG_UNLOCK(softc);
223 mtx_destroy(&softc->mtx);
224 destroy_dev(dev);
225 FREE(softc, M_TARG);
226 } else {
227 TARG_UNLOCK(softc);
228 }
229 return (error);
230}
231
232/* Enable/disable LUNs, set debugging level */
233static int
234targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
235{
236 struct targ_softc *softc;
237 cam_status status;
238
239 softc = (struct targ_softc *)dev->si_drv1;
240
241 switch (cmd) {
242 case TARGIOCENABLE:
243 {
244 struct ioc_enable_lun *new_lun;
245 struct cam_path *path;
246
247 new_lun = (struct ioc_enable_lun *)addr;
248 status = xpt_create_path(&path, /*periph*/NULL,
249 new_lun->path_id,
250 new_lun->target_id,
251 new_lun->lun_id);
252 if (status != CAM_REQ_CMP) {
253 printf("Couldn't create path, status %#x\n", status);
254 break;
255 }
256 TARG_LOCK(softc);
257 status = targenable(softc, path, new_lun->grp6_len,
258 new_lun->grp7_len);
259 TARG_UNLOCK(softc);
260 xpt_free_path(path);
261 break;
262 }
263 case TARGIOCDISABLE:
264 TARG_LOCK(softc);
265 status = targdisable(softc);
266 TARG_UNLOCK(softc);
267 break;
268 case TARGIOCDEBUG:
269 {
270#ifdef CAMDEBUG
271 struct ccb_debug cdbg;
272
273 bzero(&cdbg, sizeof cdbg);
274 if (*((int *)addr) != 0)
275 cdbg.flags = CAM_DEBUG_PERIPH;
276 else
277 cdbg.flags = CAM_DEBUG_NONE;
278 xpt_setup_ccb(&cdbg.ccb_h, softc->path, /*priority*/0);
279 cdbg.ccb_h.func_code = XPT_DEBUG;
280 cdbg.ccb_h.cbfcnp = targdone;
281
282 /* If no periph available, disallow debugging changes */
283 TARG_LOCK(softc);
284 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
285 status = CAM_DEV_NOT_THERE;
286 TARG_UNLOCK(softc);
287 break;
288 }
289 xpt_action((union ccb *)&cdbg);
290 TARG_UNLOCK(softc);
291 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
292#else
293 status = CAM_FUNC_NOTAVAIL;
294#endif
295 break;
296 }
297 default:
298 status = CAM_PROVIDE_FAIL;
299 break;
300 }
301
302 return (targcamstatus(status));
303}
304
305/* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
306static int
307targpoll(struct cdev *dev, int poll_events, struct thread *td)
308{
309 struct targ_softc *softc;
310 int revents;
311
312 softc = (struct targ_softc *)dev->si_drv1;
313
314 /* Poll for write() is always ok. */
315 revents = poll_events & (POLLOUT | POLLWRNORM);
316 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
317 /* Poll for read() depends on user and abort queues. */
318 TARG_LOCK(softc);
319 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
320 !TAILQ_EMPTY(&softc->abort_queue)) {
321 revents |= poll_events & (POLLIN | POLLRDNORM);
322 }
323 /* Only sleep if the user didn't poll for write. */
324 if (revents == 0)
325 selrecord(td, &softc->read_select);
326 TARG_UNLOCK(softc);
327 }
328
329 return (revents);
330}
331
332static int
333targkqfilter(struct cdev *dev, struct knote *kn)
334{
335 struct targ_softc *softc;
336
337 softc = (struct targ_softc *)dev->si_drv1;
338 kn->kn_hook = (caddr_t)softc;
339 kn->kn_fop = &targread_filtops;
340 knlist_add(&softc->read_select.si_note, kn, 0);
341 return (0);
342}
343
344static void
345targreadfiltdetach(struct knote *kn)
346{
347 struct targ_softc *softc;
348
349 softc = (struct targ_softc *)kn->kn_hook;
350 knlist_remove(&softc->read_select.si_note, kn, 0);
351}
352
353/* Notify the user's kqueue when the user queue or abort queue gets a CCB */
354static int
355targreadfilt(struct knote *kn, long hint)
356{
357 struct targ_softc *softc;
358 int retval;
359
360 softc = (struct targ_softc *)kn->kn_hook;
361 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
362 !TAILQ_EMPTY(&softc->abort_queue);
363 return (retval);
364}
365
366/* Send the HBA the enable/disable message */
367static cam_status
368targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
369{
370 struct ccb_en_lun en_ccb;
371 cam_status status;
372
373 /* Tell the lun to begin answering selects */
374 xpt_setup_ccb(&en_ccb.ccb_h, path, /*priority*/1);
375 en_ccb.ccb_h.func_code = XPT_EN_LUN;
376 /* Don't need support for any vendor specific commands */
377 en_ccb.grp6_len = grp6_len;
378 en_ccb.grp7_len = grp7_len;
379 en_ccb.enable = enable ? 1 : 0;
380 xpt_action((union ccb *)&en_ccb);
381 status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
382 if (status != CAM_REQ_CMP) {
383 xpt_print_path(path);
384 printf("%sable lun CCB rejected, status %#x\n",
385 enable ? "en" : "dis", status);
386 }
387 return (status);
388}
389
390/* Enable target mode on a LUN, given its path */
391static cam_status
392targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
393 int grp7_len)
394{
395 struct cam_periph *periph;
396 struct ccb_pathinq cpi;
397 cam_status status;
398
399 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
400 return (CAM_LUN_ALRDY_ENA);
401
402 /* Make sure SIM supports target mode */
403 xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
404 cpi.ccb_h.func_code = XPT_PATH_INQ;
405 xpt_action((union ccb *)&cpi);
406 status = cpi.ccb_h.status & CAM_STATUS_MASK;
407 if (status != CAM_REQ_CMP) {
408 printf("pathinq failed, status %#x\n", status);
409 goto enable_fail;
410 }
411 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
412 printf("controller does not support target mode\n");
413 status = CAM_FUNC_NOTAVAIL;
414 goto enable_fail;
415 }
416
417 /* Destroy any periph on our path if it is disabled */
418 mtx_lock(&targ_mtx);
419 periph = cam_periph_find(path, "targ");
420 if (periph != NULL) {
421 struct targ_softc *del_softc;
422
423 del_softc = (struct targ_softc *)periph->softc;
424 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
425 cam_periph_invalidate(del_softc->periph);
426 del_softc->periph = NULL;
427 } else {
428 printf("Requested path still in use by targ%d\n",
429 periph->unit_number);
430 mtx_unlock(&targ_mtx);
431 status = CAM_LUN_ALRDY_ENA;
432 goto enable_fail;
433 }
434 }
435
436 /* Create a periph instance attached to this path */
437 status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
438 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
439 mtx_unlock(&targ_mtx);
440 if (status != CAM_REQ_CMP) {
441 printf("cam_periph_alloc failed, status %#x\n", status);
442 goto enable_fail;
443 }
444
445 /* Ensure that the periph now exists. */
446 if (cam_periph_find(path, "targ") == NULL) {
447 panic("targenable: succeeded but no periph?");
448 /* NOTREACHED */
449 }
450
451 /* Send the enable lun message */
452 status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
453 if (status != CAM_REQ_CMP) {
454 printf("enable lun failed, status %#x\n", status);
455 goto enable_fail;
456 }
457 softc->state |= TARG_STATE_LUN_ENABLED;
458
459enable_fail:
460 return (status);
461}
462
463/* Disable this softc's target instance if enabled */
464static cam_status
465targdisable(struct targ_softc *softc)
466{
467 cam_status status;
468
469 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
470 return (CAM_REQ_CMP);
471
472 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
473
474 /* Abort any ccbs pending on the controller */
475 abort_all_pending(softc);
476
477 /* Disable this lun */
478 status = targendislun(softc->path, /*enable*/0,
479 /*grp6_len*/0, /*grp7_len*/0);
480 if (status == CAM_REQ_CMP)
481 softc->state &= ~TARG_STATE_LUN_ENABLED;
482 else
483 printf("Disable lun failed, status %#x\n", status);
484
485 return (status);
486}
487
488/* Initialize a periph (called from cam_periph_alloc) */
489static cam_status
490targctor(struct cam_periph *periph, void *arg)
491{
492 struct targ_softc *softc;
493
494 /* Store pointer to softc for periph-driven routines */
495 softc = (struct targ_softc *)arg;
496 periph->softc = softc;
497 softc->periph = periph;
498 softc->path = periph->path;
499 return (CAM_REQ_CMP);
500}
501
502static void
503targdtor(struct cam_periph *periph)
504{
505 struct targ_softc *softc;
506 struct ccb_hdr *ccb_h;
507 struct targ_cmd_descr *descr;
508
509 softc = (struct targ_softc *)periph->softc;
510
511 /*
512 * targdisable() aborts CCBs back to the user and leaves them
513 * on user_ccb_queue and abort_queue in case the user is still
514 * interested in them. We free them now.
515 */
516 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
517 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
518 targfreeccb(softc, (union ccb *)ccb_h);
519 }
520 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
521 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
522 FREE(descr, M_TARG);
523 }
524
525 softc->periph = NULL;
526 softc->path = NULL;
527 periph->softc = NULL;
528}
529
530/* Receive CCBs from user mode proc and send them to the HBA */
531static int
532targwrite(struct cdev *dev, struct uio *uio, int ioflag)
533{
534 union ccb *user_ccb;
535 struct targ_softc *softc;
536 struct targ_cmd_descr *descr;
537 int write_len, error;
538 int func_code, priority;
539
540 softc = (struct targ_softc *)dev->si_drv1;
541 write_len = error = 0;
542 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
543 ("write - uio_resid %d\n", uio->uio_resid));
544 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
545 union ccb *ccb;
546
547 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
548 if (error != 0) {
549 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
550 ("write - uiomove failed (%d)\n", error));
551 break;
552 }
553 priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
554 if (priority == -1) {
555 error = EINVAL;
556 break;
557 }
558 func_code = fuword32(&user_ccb->ccb_h.func_code);
559 switch (func_code) {
560 case XPT_ACCEPT_TARGET_IO:
561 case XPT_IMMED_NOTIFY:
562 ccb = targgetccb(softc, func_code, priority);
563 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
564 descr->user_ccb = user_ccb;
565 descr->func_code = func_code;
566 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
567 ("Sent ATIO/INOT (%p)\n", user_ccb));
568 xpt_action(ccb);
569 TARG_LOCK(softc);
570 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
571 &ccb->ccb_h,
572 periph_links.tqe);
573 TARG_UNLOCK(softc);
574 break;
575 default:
576 if ((func_code & XPT_FC_QUEUED) != 0) {
577 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
578 ("Sending queued ccb %#x (%p)\n",
579 func_code, user_ccb));
580 descr = targgetdescr(softc);
581 descr->user_ccb = user_ccb;
582 descr->priority = priority;
583 descr->func_code = func_code;
584 TARG_LOCK(softc);
585 TAILQ_INSERT_TAIL(&softc->work_queue,
586 descr, tqe);
587 TARG_UNLOCK(softc);
588 xpt_schedule(softc->periph, priority);
589 } else {
590 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
591 ("Sending inline ccb %#x (%p)\n",
592 func_code, user_ccb));
593 ccb = targgetccb(softc, func_code, priority);
594 descr = (struct targ_cmd_descr *)
595 ccb->ccb_h.targ_descr;
596 descr->user_ccb = user_ccb;
597 descr->priority = priority;
598 descr->func_code = func_code;
599 if (targusermerge(softc, descr, ccb) != EFAULT)
600 targsendccb(softc, ccb, descr);
601 targreturnccb(softc, ccb);
602 }
603 break;
604 }
605 write_len += sizeof(user_ccb);
606 }
607
608 /*
609 * If we've successfully taken in some amount of
610 * data, return success for that data first. If
611 * an error is persistent, it will be reported
612 * on the next write.
613 */
614 if (error != 0 && write_len == 0)
615 return (error);
616 if (write_len == 0 && uio->uio_resid != 0)
617 return (ENOSPC);
618 return (0);
619}
620
621/* Process requests (descrs) via the periph-supplied CCBs */
622static void
623targstart(struct cam_periph *periph, union ccb *start_ccb)
624{
625 struct targ_softc *softc;
626 struct targ_cmd_descr *descr, *next_descr;
627 int error;
628
629 softc = (struct targ_softc *)periph->softc;
630 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
631
632 TARG_LOCK(softc);
633 descr = TAILQ_FIRST(&softc->work_queue);
634 if (descr == NULL) {
635 TARG_UNLOCK(softc);
636 xpt_release_ccb(start_ccb);
637 } else {
638 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
639 next_descr = TAILQ_FIRST(&softc->work_queue);
640 TARG_UNLOCK(softc);
641
642 /* Initiate a transaction using the descr and supplied CCB */
643 error = targusermerge(softc, descr, start_ccb);
644 if (error == 0)
645 error = targsendccb(softc, start_ccb, descr);
646 if (error != 0) {
647 xpt_print_path(periph->path);
648 printf("targsendccb failed, err %d\n", error);
649 xpt_release_ccb(start_ccb);
650 suword(&descr->user_ccb->ccb_h.status,
651 CAM_REQ_CMP_ERR);
652 TARG_LOCK(softc);
653 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
654 TARG_UNLOCK(softc);
655 notify_user(softc);
656 }
657
658 /* If we have more work to do, stay scheduled */
659 if (next_descr != NULL)
660 xpt_schedule(periph, next_descr->priority);
661 }
662}
663
664static int
665targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
666 union ccb *ccb)
667{
668 struct ccb_hdr *u_ccbh, *k_ccbh;
669 size_t ccb_len;
670 int error;
671
672 u_ccbh = &descr->user_ccb->ccb_h;
673 k_ccbh = &ccb->ccb_h;
674
675 /*
676 * There are some fields in the CCB header that need to be
677 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
678 */
679 xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
680 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
681 k_ccbh->func_code = descr->func_code;
682 k_ccbh->flags = fuword32(&u_ccbh->flags);
683 k_ccbh->timeout = fuword32(&u_ccbh->timeout);
684 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
685 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
686 if (error != 0) {
687 k_ccbh->status = CAM_REQ_CMP_ERR;
688 return (error);
689 }
690
691 /* Translate usermode abort_ccb pointer to its kernel counterpart */
692 if (k_ccbh->func_code == XPT_ABORT) {
693 struct ccb_abort *cab;
694 struct ccb_hdr *ccb_h;
695
696 cab = (struct ccb_abort *)ccb;
697 TARG_LOCK(softc);
698 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
699 periph_links.tqe) {
700 struct targ_cmd_descr *ab_descr;
701
702 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
703 if (ab_descr->user_ccb == cab->abort_ccb) {
704 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
705 ("Changing abort for %p to %p\n",
706 cab->abort_ccb, ccb_h));
707 cab->abort_ccb = (union ccb *)ccb_h;
708 break;
709 }
710 }
711 TARG_UNLOCK(softc);
712 /* CCB not found, set appropriate status */
713 if (ccb_h == NULL) {
714 k_ccbh->status = CAM_PATH_INVALID;
715 error = ESRCH;
716 }
717 }
718
719 return (error);
720}
721
722/* Build and send a kernel CCB formed from descr->user_ccb */
723static int
724targsendccb(struct targ_softc *softc, union ccb *ccb,
725 struct targ_cmd_descr *descr)
726{
727 struct cam_periph_map_info *mapinfo;
728 struct ccb_hdr *ccb_h;
729 int error;
730
731 ccb_h = &ccb->ccb_h;
732 mapinfo = &descr->mapinfo;
733 mapinfo->num_bufs_used = 0;
734
735 /*
736 * There's no way for the user to have a completion
737 * function, so we put our own completion function in here.
738 * We also stash in a reference to our descriptor so targreturnccb()
739 * can find our mapping info.
740 */
741 ccb_h->cbfcnp = targdone;
742 ccb_h->targ_descr = descr;
743
744 /*
745 * We only attempt to map the user memory into kernel space
746 * if they haven't passed in a physical memory pointer,
747 * and if there is actually an I/O operation to perform.
748 * Right now cam_periph_mapmem() only supports SCSI and device
749 * match CCBs. For the SCSI CCBs, we only pass the CCB in if
750 * there's actually data to map. cam_periph_mapmem() will do the
751 * right thing, even if there isn't data to map, but since CCBs
752 * without data are a reasonably common occurance (e.g. test unit
753 * ready), it will save a few cycles if we check for it here.
754 */
755 if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
756 && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
757 && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
758 || (ccb_h->func_code == XPT_DEV_MATCH))) {
759
760 error = cam_periph_mapmem(ccb, mapinfo);
761
762 /*
763 * cam_periph_mapmem returned an error, we can't continue.
764 * Return the error to the user.
765 */
766 if (error) {
767 ccb_h->status = CAM_REQ_CMP_ERR;
768 mapinfo->num_bufs_used = 0;
769 return (error);
770 }
771 }
772
773 /*
774 * Once queued on the pending CCB list, this CCB will be protected
775 * by our error recovery handler.
776 */
777 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
778 if (XPT_FC_IS_QUEUED(ccb)) {
779 TARG_LOCK(softc);
780 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
781 periph_links.tqe);
782 TARG_UNLOCK(softc);
783 }
784 xpt_action(ccb);
785
786 return (0);
787}
788
789/* Completion routine for CCBs (called at splsoftcam) */
790static void
791targdone(struct cam_periph *periph, union ccb *done_ccb)
792{
793 struct targ_softc *softc;
794 cam_status status;
795
796 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
797 softc = (struct targ_softc *)periph->softc;
798 TARG_LOCK(softc);
799 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
800 periph_links.tqe);
801 status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
802
803 /* If we're no longer enabled, throw away CCB */
804 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
805 targfreeccb(softc, done_ccb);
806 TARG_UNLOCK(softc);
807 return;
808 }
809 /* abort_all_pending() waits for pending queue to be empty */
810 if (TAILQ_EMPTY(&softc->pending_ccb_queue))
811 wakeup(&softc->pending_ccb_queue);
812
813 switch (done_ccb->ccb_h.func_code) {
814 /* All FC_*_QUEUED CCBs go back to userland */
815 case XPT_IMMED_NOTIFY:
816 case XPT_ACCEPT_TARGET_IO:
817 case XPT_CONT_TARGET_IO:
818 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
819 periph_links.tqe);
820 TARG_UNLOCK(softc);
821 notify_user(softc);
822 break;
823 default:
824 panic("targdone: impossible xpt opcode %#x",
825 done_ccb->ccb_h.func_code);
826 /* NOTREACHED */
827 }
828}
829
830/* Return CCBs to the user from the user queue and abort queue */
831static int
832targread(struct cdev *dev, struct uio *uio, int ioflag)
833{
834 struct descr_queue *abort_queue;
835 struct targ_cmd_descr *user_descr;
836 struct targ_softc *softc;
837 struct ccb_queue *user_queue;
838 struct ccb_hdr *ccb_h;
839 union ccb *user_ccb;
840 int read_len, error;
841
842 error = 0;
843 read_len = 0;
844 softc = (struct targ_softc *)dev->si_drv1;
845 user_queue = &softc->user_ccb_queue;
846 abort_queue = &softc->abort_queue;
847 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
848
849 /* If no data is available, wait or return immediately */
850 TARG_LOCK(softc);
851 ccb_h = TAILQ_FIRST(user_queue);
852 user_descr = TAILQ_FIRST(abort_queue);
853 while (ccb_h == NULL && user_descr == NULL) {
854 if ((ioflag & IO_NDELAY) == 0) {
855 error = msleep(user_queue, &softc->mtx,
856 PRIBIO | PCATCH, "targrd", 0);
857 ccb_h = TAILQ_FIRST(user_queue);
858 user_descr = TAILQ_FIRST(abort_queue);
859 if (error != 0) {
860 if (error == ERESTART) {
861 continue;
862 } else {
863 TARG_UNLOCK(softc);
864 goto read_fail;
865 }
866 }
867 } else {
868 TARG_UNLOCK(softc);
869 return (EAGAIN);
870 }
871 }
872
873 /* Data is available so fill the user's buffer */
874 while (ccb_h != NULL) {
875 struct targ_cmd_descr *descr;
876
877 if (uio->uio_resid < sizeof(user_ccb))
878 break;
879 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
880 TARG_UNLOCK(softc);
881 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
882 user_ccb = descr->user_ccb;
883 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
884 ("targread ccb %p (%p)\n", ccb_h, user_ccb));
885 error = targreturnccb(softc, (union ccb *)ccb_h);
886 if (error != 0)
887 goto read_fail;
888 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
889 if (error != 0)
890 goto read_fail;
891 read_len += sizeof(user_ccb);
892
893 TARG_LOCK(softc);
894 ccb_h = TAILQ_FIRST(user_queue);
895 }
896
897 /* Flush out any aborted descriptors */
898 while (user_descr != NULL) {
899 if (uio->uio_resid < sizeof(user_ccb))
900 break;
901 TAILQ_REMOVE(abort_queue, user_descr, tqe);
902 TARG_UNLOCK(softc);
903 user_ccb = user_descr->user_ccb;
904 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
905 ("targread aborted descr %p (%p)\n",
906 user_descr, user_ccb));
907 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
908 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
909 if (error != 0)
910 goto read_fail;
911 read_len += sizeof(user_ccb);
912
913 TARG_LOCK(softc);
914 user_descr = TAILQ_FIRST(abort_queue);
915 }
916 TARG_UNLOCK(softc);
917
918 /*
919 * If we've successfully read some amount of data, don't report an
920 * error. If the error is persistent, it will be reported on the
921 * next read().
922 */
923 if (read_len == 0 && uio->uio_resid != 0)
924 error = ENOSPC;
925
926read_fail:
927 return (error);
928}
929
930/* Copy completed ccb back to the user */
931static int
932targreturnccb(struct targ_softc *softc, union ccb *ccb)
933{
934 struct targ_cmd_descr *descr;
935 struct ccb_hdr *u_ccbh;
936 size_t ccb_len;
937 int error;
938
939 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
940 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
941 u_ccbh = &descr->user_ccb->ccb_h;
942
943 /* Copy out the central portion of the ccb_hdr */
944 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
945 offsetof(struct ccb_hdr, periph_priv) -
946 offsetof(struct ccb_hdr, retry_count));
947
948 /* Copy out the rest of the ccb (after the ccb_hdr) */
949 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
950 if (descr->mapinfo.num_bufs_used != 0)
951 cam_periph_unmapmem(ccb, &descr->mapinfo);
952 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
953 if (error != 0) {
954 xpt_print_path(softc->path);
955 printf("targreturnccb - CCB copyout failed (%d)\n",
956 error);
957 }
958 /* Free CCB or send back to devq. */
959 targfreeccb(softc, ccb);
960
961 return (error);
962}
963
964static union ccb *
965targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
966{
967 union ccb *ccb;
968 int ccb_len;
969
970 ccb_len = targccblen(type);
971 MALLOC(ccb, union ccb *, ccb_len, M_TARG, M_WAITOK);
972 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
973
974 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
975 ccb->ccb_h.func_code = type;
976 ccb->ccb_h.cbfcnp = targdone;
977 ccb->ccb_h.targ_descr = targgetdescr(softc);
978 return (ccb);
979}
980
981static void
982targfreeccb(struct targ_softc *softc, union ccb *ccb)
983{
984 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
985 ccb->ccb_h.targ_descr));
986 FREE(ccb->ccb_h.targ_descr, M_TARG);
987
988 switch (ccb->ccb_h.func_code) {
989 case XPT_ACCEPT_TARGET_IO:
990 case XPT_IMMED_NOTIFY:
991 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
992 FREE(ccb, M_TARG);
993 break;
994 default:
995 /* Send back CCB if we got it from the periph */
996 if (XPT_FC_IS_QUEUED(ccb)) {
997 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
998 ("returning queued ccb %p\n", ccb));
999 xpt_release_ccb(ccb);
1000 } else {
1001 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1002 ("freeing ccb %p\n", ccb));
1003 FREE(ccb, M_TARG);
1004 }
1005 break;
1006 }
1007}
1008
1009static struct targ_cmd_descr *
1010targgetdescr(struct targ_softc *softc)
1011{
1012 struct targ_cmd_descr *descr;
1013
1014 MALLOC(descr, struct targ_cmd_descr *, sizeof(*descr), M_TARG,
1015 M_WAITOK);
1016 descr->mapinfo.num_bufs_used = 0;
1017 return (descr);
1018}
1019
1020static void
1021targinit(void)
1022{
1023 mtx_init(&targ_mtx, "targ global", NULL, MTX_DEF);
1024 EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
1025}
1026
1027static void
1028targclone(void *arg, char *name, int namelen, struct cdev **dev)
1029{
1030 int u;
1031
1032 if (*dev != NULL)
1033 return;
1034 if (dev_stdclone(name, NULL, "targ", &u) != 1)
1035 return;
1036 *dev = make_dev(&targ_cdevsw, unit2minor(u), UID_ROOT, GID_WHEEL,
1037 0600, "targ%d", u);
| 32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/conf.h>
37#include <sys/malloc.h>
38#include <sys/poll.h>
39#include <sys/vnode.h>
40#include <sys/lock.h>
41#include <sys/mutex.h>
42#include <sys/devicestat.h>
43
44#include <cam/cam.h>
45#include <cam/cam_ccb.h>
46#include <cam/cam_periph.h>
47#include <cam/cam_xpt_periph.h>
48#include <cam/scsi/scsi_targetio.h>
49
50/* Transaction information attached to each CCB sent by the user */
51struct targ_cmd_descr {
52 struct cam_periph_map_info mapinfo;
53 TAILQ_ENTRY(targ_cmd_descr) tqe;
54 union ccb *user_ccb;
55 int priority;
56 int func_code;
57};
58
59/* Offset into the private CCB area for storing our descriptor */
60#define targ_descr periph_priv.entries[1].ptr
61
62TAILQ_HEAD(descr_queue, targ_cmd_descr);
63
64typedef enum {
65 TARG_STATE_RESV = 0x00, /* Invalid state */
66 TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */
67 TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */
68} targ_state;
69
70/* Per-instance device software context */
71struct targ_softc {
72 /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
73 struct ccb_queue pending_ccb_queue;
74
75 /* Command descriptors awaiting CTIO resources from the XPT */
76 struct descr_queue work_queue;
77
78 /* Command descriptors that have been aborted back to the user. */
79 struct descr_queue abort_queue;
80
81 /*
82 * Queue of CCBs that have been copied out to userland, but our
83 * userland daemon has not yet seen.
84 */
85 struct ccb_queue user_ccb_queue;
86
87 struct cam_periph *periph;
88 struct cam_path *path;
89 targ_state state;
90 struct selinfo read_select;
91 struct devstat device_stats;
92 struct mtx mtx;
93};
94
95static d_open_t targopen;
96static d_close_t targclose;
97static d_read_t targread;
98static d_write_t targwrite;
99static d_ioctl_t targioctl;
100static d_poll_t targpoll;
101static d_kqfilter_t targkqfilter;
102static void targreadfiltdetach(struct knote *kn);
103static int targreadfilt(struct knote *kn, long hint);
104static struct filterops targread_filtops =
105 { 1, NULL, targreadfiltdetach, targreadfilt };
106
107static struct cdevsw targ_cdevsw = {
108 .d_version = D_VERSION,
109 .d_flags = D_NEEDGIANT,
110 .d_open = targopen,
111 .d_close = targclose,
112 .d_read = targread,
113 .d_write = targwrite,
114 .d_ioctl = targioctl,
115 .d_poll = targpoll,
116 .d_name = "targ",
117 .d_kqfilter = targkqfilter
118};
119
120static cam_status targendislun(struct cam_path *path, int enable,
121 int grp6_len, int grp7_len);
122static cam_status targenable(struct targ_softc *softc,
123 struct cam_path *path,
124 int grp6_len, int grp7_len);
125static cam_status targdisable(struct targ_softc *softc);
126static periph_ctor_t targctor;
127static periph_dtor_t targdtor;
128static periph_start_t targstart;
129static int targusermerge(struct targ_softc *softc,
130 struct targ_cmd_descr *descr,
131 union ccb *ccb);
132static int targsendccb(struct targ_softc *softc, union ccb *ccb,
133 struct targ_cmd_descr *descr);
134static void targdone(struct cam_periph *periph,
135 union ccb *done_ccb);
136static int targreturnccb(struct targ_softc *softc,
137 union ccb *ccb);
138static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type,
139 int priority);
140static void targfreeccb(struct targ_softc *softc, union ccb *ccb);
141static struct targ_cmd_descr *
142 targgetdescr(struct targ_softc *softc);
143static periph_init_t targinit;
144static void targclone(void *arg, char *name, int namelen,
145 struct cdev **dev);
146static void targasync(void *callback_arg, u_int32_t code,
147 struct cam_path *path, void *arg);
148static void abort_all_pending(struct targ_softc *softc);
149static void notify_user(struct targ_softc *softc);
150static int targcamstatus(cam_status status);
151static size_t targccblen(xpt_opcode func_code);
152
153static struct periph_driver targdriver =
154{
155 targinit, "targ",
156 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
157};
158PERIPHDRIVER_DECLARE(targ, targdriver);
159
160static struct mtx targ_mtx;
161#define TARG_LOCK(softc) mtx_lock(&(softc)->mtx)
162#define TARG_UNLOCK(softc) mtx_unlock(&(softc)->mtx)
163
164static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
165
166/* Create softc and initialize it. Only one proc can open each targ device. */
167static int
168targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
169{
170 struct targ_softc *softc;
171
172 mtx_lock(&targ_mtx);
173 if (dev->si_drv1 != 0) {
174 mtx_unlock(&targ_mtx);
175 return (EBUSY);
176 }
177
178 /* Mark device busy before any potentially blocking operations */
179 dev->si_drv1 = (void *)~0;
180 mtx_unlock(&targ_mtx);
181
182 /* Create the targ device, allocate its softc, initialize it */
183 if ((dev->si_flags & SI_NAMED) == 0) {
184 make_dev(&targ_cdevsw, minor(dev), UID_ROOT, GID_WHEEL, 0600,
185 "targ%d", dev2unit(dev));
186 }
187 MALLOC(softc, struct targ_softc *, sizeof(*softc), M_TARG,
188 M_WAITOK | M_ZERO);
189 dev->si_drv1 = softc;
190 softc->state = TARG_STATE_OPENED;
191 softc->periph = NULL;
192 softc->path = NULL;
193 mtx_init(&softc->mtx, devtoname(dev), "targ cdev", MTX_DEF);
194
195 TAILQ_INIT(&softc->pending_ccb_queue);
196 TAILQ_INIT(&softc->work_queue);
197 TAILQ_INIT(&softc->abort_queue);
198 TAILQ_INIT(&softc->user_ccb_queue);
199 knlist_init(&softc->read_select.si_note, &softc->mtx);
200
201 return (0);
202}
203
204/* Disable LUN if enabled and teardown softc */
205static int
206targclose(struct cdev *dev, int flag, int fmt, struct thread *td)
207{
208 struct targ_softc *softc;
209 int error;
210
211 softc = (struct targ_softc *)dev->si_drv1;
212 TARG_LOCK(softc);
213 error = targdisable(softc);
214 if (error == CAM_REQ_CMP) {
215 dev->si_drv1 = 0;
216 mtx_lock(&targ_mtx);
217 if (softc->periph != NULL) {
218 cam_periph_invalidate(softc->periph);
219 softc->periph = NULL;
220 }
221 mtx_unlock(&targ_mtx);
222 TARG_UNLOCK(softc);
223 mtx_destroy(&softc->mtx);
224 destroy_dev(dev);
225 FREE(softc, M_TARG);
226 } else {
227 TARG_UNLOCK(softc);
228 }
229 return (error);
230}
231
232/* Enable/disable LUNs, set debugging level */
233static int
234targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
235{
236 struct targ_softc *softc;
237 cam_status status;
238
239 softc = (struct targ_softc *)dev->si_drv1;
240
241 switch (cmd) {
242 case TARGIOCENABLE:
243 {
244 struct ioc_enable_lun *new_lun;
245 struct cam_path *path;
246
247 new_lun = (struct ioc_enable_lun *)addr;
248 status = xpt_create_path(&path, /*periph*/NULL,
249 new_lun->path_id,
250 new_lun->target_id,
251 new_lun->lun_id);
252 if (status != CAM_REQ_CMP) {
253 printf("Couldn't create path, status %#x\n", status);
254 break;
255 }
256 TARG_LOCK(softc);
257 status = targenable(softc, path, new_lun->grp6_len,
258 new_lun->grp7_len);
259 TARG_UNLOCK(softc);
260 xpt_free_path(path);
261 break;
262 }
263 case TARGIOCDISABLE:
264 TARG_LOCK(softc);
265 status = targdisable(softc);
266 TARG_UNLOCK(softc);
267 break;
268 case TARGIOCDEBUG:
269 {
270#ifdef CAMDEBUG
271 struct ccb_debug cdbg;
272
273 bzero(&cdbg, sizeof cdbg);
274 if (*((int *)addr) != 0)
275 cdbg.flags = CAM_DEBUG_PERIPH;
276 else
277 cdbg.flags = CAM_DEBUG_NONE;
278 xpt_setup_ccb(&cdbg.ccb_h, softc->path, /*priority*/0);
279 cdbg.ccb_h.func_code = XPT_DEBUG;
280 cdbg.ccb_h.cbfcnp = targdone;
281
282 /* If no periph available, disallow debugging changes */
283 TARG_LOCK(softc);
284 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
285 status = CAM_DEV_NOT_THERE;
286 TARG_UNLOCK(softc);
287 break;
288 }
289 xpt_action((union ccb *)&cdbg);
290 TARG_UNLOCK(softc);
291 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
292#else
293 status = CAM_FUNC_NOTAVAIL;
294#endif
295 break;
296 }
297 default:
298 status = CAM_PROVIDE_FAIL;
299 break;
300 }
301
302 return (targcamstatus(status));
303}
304
305/* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
306static int
307targpoll(struct cdev *dev, int poll_events, struct thread *td)
308{
309 struct targ_softc *softc;
310 int revents;
311
312 softc = (struct targ_softc *)dev->si_drv1;
313
314 /* Poll for write() is always ok. */
315 revents = poll_events & (POLLOUT | POLLWRNORM);
316 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
317 /* Poll for read() depends on user and abort queues. */
318 TARG_LOCK(softc);
319 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
320 !TAILQ_EMPTY(&softc->abort_queue)) {
321 revents |= poll_events & (POLLIN | POLLRDNORM);
322 }
323 /* Only sleep if the user didn't poll for write. */
324 if (revents == 0)
325 selrecord(td, &softc->read_select);
326 TARG_UNLOCK(softc);
327 }
328
329 return (revents);
330}
331
332static int
333targkqfilter(struct cdev *dev, struct knote *kn)
334{
335 struct targ_softc *softc;
336
337 softc = (struct targ_softc *)dev->si_drv1;
338 kn->kn_hook = (caddr_t)softc;
339 kn->kn_fop = &targread_filtops;
340 knlist_add(&softc->read_select.si_note, kn, 0);
341 return (0);
342}
343
344static void
345targreadfiltdetach(struct knote *kn)
346{
347 struct targ_softc *softc;
348
349 softc = (struct targ_softc *)kn->kn_hook;
350 knlist_remove(&softc->read_select.si_note, kn, 0);
351}
352
353/* Notify the user's kqueue when the user queue or abort queue gets a CCB */
354static int
355targreadfilt(struct knote *kn, long hint)
356{
357 struct targ_softc *softc;
358 int retval;
359
360 softc = (struct targ_softc *)kn->kn_hook;
361 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
362 !TAILQ_EMPTY(&softc->abort_queue);
363 return (retval);
364}
365
366/* Send the HBA the enable/disable message */
367static cam_status
368targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
369{
370 struct ccb_en_lun en_ccb;
371 cam_status status;
372
373 /* Tell the lun to begin answering selects */
374 xpt_setup_ccb(&en_ccb.ccb_h, path, /*priority*/1);
375 en_ccb.ccb_h.func_code = XPT_EN_LUN;
376 /* Don't need support for any vendor specific commands */
377 en_ccb.grp6_len = grp6_len;
378 en_ccb.grp7_len = grp7_len;
379 en_ccb.enable = enable ? 1 : 0;
380 xpt_action((union ccb *)&en_ccb);
381 status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
382 if (status != CAM_REQ_CMP) {
383 xpt_print_path(path);
384 printf("%sable lun CCB rejected, status %#x\n",
385 enable ? "en" : "dis", status);
386 }
387 return (status);
388}
389
390/* Enable target mode on a LUN, given its path */
391static cam_status
392targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
393 int grp7_len)
394{
395 struct cam_periph *periph;
396 struct ccb_pathinq cpi;
397 cam_status status;
398
399 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
400 return (CAM_LUN_ALRDY_ENA);
401
402 /* Make sure SIM supports target mode */
403 xpt_setup_ccb(&cpi.ccb_h, path, /*priority*/1);
404 cpi.ccb_h.func_code = XPT_PATH_INQ;
405 xpt_action((union ccb *)&cpi);
406 status = cpi.ccb_h.status & CAM_STATUS_MASK;
407 if (status != CAM_REQ_CMP) {
408 printf("pathinq failed, status %#x\n", status);
409 goto enable_fail;
410 }
411 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
412 printf("controller does not support target mode\n");
413 status = CAM_FUNC_NOTAVAIL;
414 goto enable_fail;
415 }
416
417 /* Destroy any periph on our path if it is disabled */
418 mtx_lock(&targ_mtx);
419 periph = cam_periph_find(path, "targ");
420 if (periph != NULL) {
421 struct targ_softc *del_softc;
422
423 del_softc = (struct targ_softc *)periph->softc;
424 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
425 cam_periph_invalidate(del_softc->periph);
426 del_softc->periph = NULL;
427 } else {
428 printf("Requested path still in use by targ%d\n",
429 periph->unit_number);
430 mtx_unlock(&targ_mtx);
431 status = CAM_LUN_ALRDY_ENA;
432 goto enable_fail;
433 }
434 }
435
436 /* Create a periph instance attached to this path */
437 status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
438 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
439 mtx_unlock(&targ_mtx);
440 if (status != CAM_REQ_CMP) {
441 printf("cam_periph_alloc failed, status %#x\n", status);
442 goto enable_fail;
443 }
444
445 /* Ensure that the periph now exists. */
446 if (cam_periph_find(path, "targ") == NULL) {
447 panic("targenable: succeeded but no periph?");
448 /* NOTREACHED */
449 }
450
451 /* Send the enable lun message */
452 status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
453 if (status != CAM_REQ_CMP) {
454 printf("enable lun failed, status %#x\n", status);
455 goto enable_fail;
456 }
457 softc->state |= TARG_STATE_LUN_ENABLED;
458
459enable_fail:
460 return (status);
461}
462
463/* Disable this softc's target instance if enabled */
464static cam_status
465targdisable(struct targ_softc *softc)
466{
467 cam_status status;
468
469 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
470 return (CAM_REQ_CMP);
471
472 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
473
474 /* Abort any ccbs pending on the controller */
475 abort_all_pending(softc);
476
477 /* Disable this lun */
478 status = targendislun(softc->path, /*enable*/0,
479 /*grp6_len*/0, /*grp7_len*/0);
480 if (status == CAM_REQ_CMP)
481 softc->state &= ~TARG_STATE_LUN_ENABLED;
482 else
483 printf("Disable lun failed, status %#x\n", status);
484
485 return (status);
486}
487
488/* Initialize a periph (called from cam_periph_alloc) */
489static cam_status
490targctor(struct cam_periph *periph, void *arg)
491{
492 struct targ_softc *softc;
493
494 /* Store pointer to softc for periph-driven routines */
495 softc = (struct targ_softc *)arg;
496 periph->softc = softc;
497 softc->periph = periph;
498 softc->path = periph->path;
499 return (CAM_REQ_CMP);
500}
501
502static void
503targdtor(struct cam_periph *periph)
504{
505 struct targ_softc *softc;
506 struct ccb_hdr *ccb_h;
507 struct targ_cmd_descr *descr;
508
509 softc = (struct targ_softc *)periph->softc;
510
511 /*
512 * targdisable() aborts CCBs back to the user and leaves them
513 * on user_ccb_queue and abort_queue in case the user is still
514 * interested in them. We free them now.
515 */
516 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
517 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
518 targfreeccb(softc, (union ccb *)ccb_h);
519 }
520 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
521 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
522 FREE(descr, M_TARG);
523 }
524
525 softc->periph = NULL;
526 softc->path = NULL;
527 periph->softc = NULL;
528}
529
530/* Receive CCBs from user mode proc and send them to the HBA */
531static int
532targwrite(struct cdev *dev, struct uio *uio, int ioflag)
533{
534 union ccb *user_ccb;
535 struct targ_softc *softc;
536 struct targ_cmd_descr *descr;
537 int write_len, error;
538 int func_code, priority;
539
540 softc = (struct targ_softc *)dev->si_drv1;
541 write_len = error = 0;
542 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
543 ("write - uio_resid %d\n", uio->uio_resid));
544 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
545 union ccb *ccb;
546
547 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
548 if (error != 0) {
549 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
550 ("write - uiomove failed (%d)\n", error));
551 break;
552 }
553 priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
554 if (priority == -1) {
555 error = EINVAL;
556 break;
557 }
558 func_code = fuword32(&user_ccb->ccb_h.func_code);
559 switch (func_code) {
560 case XPT_ACCEPT_TARGET_IO:
561 case XPT_IMMED_NOTIFY:
562 ccb = targgetccb(softc, func_code, priority);
563 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
564 descr->user_ccb = user_ccb;
565 descr->func_code = func_code;
566 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
567 ("Sent ATIO/INOT (%p)\n", user_ccb));
568 xpt_action(ccb);
569 TARG_LOCK(softc);
570 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
571 &ccb->ccb_h,
572 periph_links.tqe);
573 TARG_UNLOCK(softc);
574 break;
575 default:
576 if ((func_code & XPT_FC_QUEUED) != 0) {
577 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
578 ("Sending queued ccb %#x (%p)\n",
579 func_code, user_ccb));
580 descr = targgetdescr(softc);
581 descr->user_ccb = user_ccb;
582 descr->priority = priority;
583 descr->func_code = func_code;
584 TARG_LOCK(softc);
585 TAILQ_INSERT_TAIL(&softc->work_queue,
586 descr, tqe);
587 TARG_UNLOCK(softc);
588 xpt_schedule(softc->periph, priority);
589 } else {
590 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
591 ("Sending inline ccb %#x (%p)\n",
592 func_code, user_ccb));
593 ccb = targgetccb(softc, func_code, priority);
594 descr = (struct targ_cmd_descr *)
595 ccb->ccb_h.targ_descr;
596 descr->user_ccb = user_ccb;
597 descr->priority = priority;
598 descr->func_code = func_code;
599 if (targusermerge(softc, descr, ccb) != EFAULT)
600 targsendccb(softc, ccb, descr);
601 targreturnccb(softc, ccb);
602 }
603 break;
604 }
605 write_len += sizeof(user_ccb);
606 }
607
608 /*
609 * If we've successfully taken in some amount of
610 * data, return success for that data first. If
611 * an error is persistent, it will be reported
612 * on the next write.
613 */
614 if (error != 0 && write_len == 0)
615 return (error);
616 if (write_len == 0 && uio->uio_resid != 0)
617 return (ENOSPC);
618 return (0);
619}
620
621/* Process requests (descrs) via the periph-supplied CCBs */
622static void
623targstart(struct cam_periph *periph, union ccb *start_ccb)
624{
625 struct targ_softc *softc;
626 struct targ_cmd_descr *descr, *next_descr;
627 int error;
628
629 softc = (struct targ_softc *)periph->softc;
630 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
631
632 TARG_LOCK(softc);
633 descr = TAILQ_FIRST(&softc->work_queue);
634 if (descr == NULL) {
635 TARG_UNLOCK(softc);
636 xpt_release_ccb(start_ccb);
637 } else {
638 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
639 next_descr = TAILQ_FIRST(&softc->work_queue);
640 TARG_UNLOCK(softc);
641
642 /* Initiate a transaction using the descr and supplied CCB */
643 error = targusermerge(softc, descr, start_ccb);
644 if (error == 0)
645 error = targsendccb(softc, start_ccb, descr);
646 if (error != 0) {
647 xpt_print_path(periph->path);
648 printf("targsendccb failed, err %d\n", error);
649 xpt_release_ccb(start_ccb);
650 suword(&descr->user_ccb->ccb_h.status,
651 CAM_REQ_CMP_ERR);
652 TARG_LOCK(softc);
653 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
654 TARG_UNLOCK(softc);
655 notify_user(softc);
656 }
657
658 /* If we have more work to do, stay scheduled */
659 if (next_descr != NULL)
660 xpt_schedule(periph, next_descr->priority);
661 }
662}
663
664static int
665targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
666 union ccb *ccb)
667{
668 struct ccb_hdr *u_ccbh, *k_ccbh;
669 size_t ccb_len;
670 int error;
671
672 u_ccbh = &descr->user_ccb->ccb_h;
673 k_ccbh = &ccb->ccb_h;
674
675 /*
676 * There are some fields in the CCB header that need to be
677 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
678 */
679 xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
680 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
681 k_ccbh->func_code = descr->func_code;
682 k_ccbh->flags = fuword32(&u_ccbh->flags);
683 k_ccbh->timeout = fuword32(&u_ccbh->timeout);
684 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
685 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
686 if (error != 0) {
687 k_ccbh->status = CAM_REQ_CMP_ERR;
688 return (error);
689 }
690
691 /* Translate usermode abort_ccb pointer to its kernel counterpart */
692 if (k_ccbh->func_code == XPT_ABORT) {
693 struct ccb_abort *cab;
694 struct ccb_hdr *ccb_h;
695
696 cab = (struct ccb_abort *)ccb;
697 TARG_LOCK(softc);
698 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
699 periph_links.tqe) {
700 struct targ_cmd_descr *ab_descr;
701
702 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
703 if (ab_descr->user_ccb == cab->abort_ccb) {
704 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
705 ("Changing abort for %p to %p\n",
706 cab->abort_ccb, ccb_h));
707 cab->abort_ccb = (union ccb *)ccb_h;
708 break;
709 }
710 }
711 TARG_UNLOCK(softc);
712 /* CCB not found, set appropriate status */
713 if (ccb_h == NULL) {
714 k_ccbh->status = CAM_PATH_INVALID;
715 error = ESRCH;
716 }
717 }
718
719 return (error);
720}
721
722/* Build and send a kernel CCB formed from descr->user_ccb */
723static int
724targsendccb(struct targ_softc *softc, union ccb *ccb,
725 struct targ_cmd_descr *descr)
726{
727 struct cam_periph_map_info *mapinfo;
728 struct ccb_hdr *ccb_h;
729 int error;
730
731 ccb_h = &ccb->ccb_h;
732 mapinfo = &descr->mapinfo;
733 mapinfo->num_bufs_used = 0;
734
735 /*
736 * There's no way for the user to have a completion
737 * function, so we put our own completion function in here.
738 * We also stash in a reference to our descriptor so targreturnccb()
739 * can find our mapping info.
740 */
741 ccb_h->cbfcnp = targdone;
742 ccb_h->targ_descr = descr;
743
744 /*
745 * We only attempt to map the user memory into kernel space
746 * if they haven't passed in a physical memory pointer,
747 * and if there is actually an I/O operation to perform.
748 * Right now cam_periph_mapmem() only supports SCSI and device
749 * match CCBs. For the SCSI CCBs, we only pass the CCB in if
750 * there's actually data to map. cam_periph_mapmem() will do the
751 * right thing, even if there isn't data to map, but since CCBs
752 * without data are a reasonably common occurance (e.g. test unit
753 * ready), it will save a few cycles if we check for it here.
754 */
755 if (((ccb_h->flags & CAM_DATA_PHYS) == 0)
756 && (((ccb_h->func_code == XPT_CONT_TARGET_IO)
757 && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE))
758 || (ccb_h->func_code == XPT_DEV_MATCH))) {
759
760 error = cam_periph_mapmem(ccb, mapinfo);
761
762 /*
763 * cam_periph_mapmem returned an error, we can't continue.
764 * Return the error to the user.
765 */
766 if (error) {
767 ccb_h->status = CAM_REQ_CMP_ERR;
768 mapinfo->num_bufs_used = 0;
769 return (error);
770 }
771 }
772
773 /*
774 * Once queued on the pending CCB list, this CCB will be protected
775 * by our error recovery handler.
776 */
777 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
778 if (XPT_FC_IS_QUEUED(ccb)) {
779 TARG_LOCK(softc);
780 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
781 periph_links.tqe);
782 TARG_UNLOCK(softc);
783 }
784 xpt_action(ccb);
785
786 return (0);
787}
788
789/* Completion routine for CCBs (called at splsoftcam) */
790static void
791targdone(struct cam_periph *periph, union ccb *done_ccb)
792{
793 struct targ_softc *softc;
794 cam_status status;
795
796 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
797 softc = (struct targ_softc *)periph->softc;
798 TARG_LOCK(softc);
799 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
800 periph_links.tqe);
801 status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
802
803 /* If we're no longer enabled, throw away CCB */
804 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
805 targfreeccb(softc, done_ccb);
806 TARG_UNLOCK(softc);
807 return;
808 }
809 /* abort_all_pending() waits for pending queue to be empty */
810 if (TAILQ_EMPTY(&softc->pending_ccb_queue))
811 wakeup(&softc->pending_ccb_queue);
812
813 switch (done_ccb->ccb_h.func_code) {
814 /* All FC_*_QUEUED CCBs go back to userland */
815 case XPT_IMMED_NOTIFY:
816 case XPT_ACCEPT_TARGET_IO:
817 case XPT_CONT_TARGET_IO:
818 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
819 periph_links.tqe);
820 TARG_UNLOCK(softc);
821 notify_user(softc);
822 break;
823 default:
824 panic("targdone: impossible xpt opcode %#x",
825 done_ccb->ccb_h.func_code);
826 /* NOTREACHED */
827 }
828}
829
830/* Return CCBs to the user from the user queue and abort queue */
831static int
832targread(struct cdev *dev, struct uio *uio, int ioflag)
833{
834 struct descr_queue *abort_queue;
835 struct targ_cmd_descr *user_descr;
836 struct targ_softc *softc;
837 struct ccb_queue *user_queue;
838 struct ccb_hdr *ccb_h;
839 union ccb *user_ccb;
840 int read_len, error;
841
842 error = 0;
843 read_len = 0;
844 softc = (struct targ_softc *)dev->si_drv1;
845 user_queue = &softc->user_ccb_queue;
846 abort_queue = &softc->abort_queue;
847 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
848
849 /* If no data is available, wait or return immediately */
850 TARG_LOCK(softc);
851 ccb_h = TAILQ_FIRST(user_queue);
852 user_descr = TAILQ_FIRST(abort_queue);
853 while (ccb_h == NULL && user_descr == NULL) {
854 if ((ioflag & IO_NDELAY) == 0) {
855 error = msleep(user_queue, &softc->mtx,
856 PRIBIO | PCATCH, "targrd", 0);
857 ccb_h = TAILQ_FIRST(user_queue);
858 user_descr = TAILQ_FIRST(abort_queue);
859 if (error != 0) {
860 if (error == ERESTART) {
861 continue;
862 } else {
863 TARG_UNLOCK(softc);
864 goto read_fail;
865 }
866 }
867 } else {
868 TARG_UNLOCK(softc);
869 return (EAGAIN);
870 }
871 }
872
873 /* Data is available so fill the user's buffer */
874 while (ccb_h != NULL) {
875 struct targ_cmd_descr *descr;
876
877 if (uio->uio_resid < sizeof(user_ccb))
878 break;
879 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
880 TARG_UNLOCK(softc);
881 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
882 user_ccb = descr->user_ccb;
883 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
884 ("targread ccb %p (%p)\n", ccb_h, user_ccb));
885 error = targreturnccb(softc, (union ccb *)ccb_h);
886 if (error != 0)
887 goto read_fail;
888 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
889 if (error != 0)
890 goto read_fail;
891 read_len += sizeof(user_ccb);
892
893 TARG_LOCK(softc);
894 ccb_h = TAILQ_FIRST(user_queue);
895 }
896
897 /* Flush out any aborted descriptors */
898 while (user_descr != NULL) {
899 if (uio->uio_resid < sizeof(user_ccb))
900 break;
901 TAILQ_REMOVE(abort_queue, user_descr, tqe);
902 TARG_UNLOCK(softc);
903 user_ccb = user_descr->user_ccb;
904 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
905 ("targread aborted descr %p (%p)\n",
906 user_descr, user_ccb));
907 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
908 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
909 if (error != 0)
910 goto read_fail;
911 read_len += sizeof(user_ccb);
912
913 TARG_LOCK(softc);
914 user_descr = TAILQ_FIRST(abort_queue);
915 }
916 TARG_UNLOCK(softc);
917
918 /*
919 * If we've successfully read some amount of data, don't report an
920 * error. If the error is persistent, it will be reported on the
921 * next read().
922 */
923 if (read_len == 0 && uio->uio_resid != 0)
924 error = ENOSPC;
925
926read_fail:
927 return (error);
928}
929
930/* Copy completed ccb back to the user */
931static int
932targreturnccb(struct targ_softc *softc, union ccb *ccb)
933{
934 struct targ_cmd_descr *descr;
935 struct ccb_hdr *u_ccbh;
936 size_t ccb_len;
937 int error;
938
939 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
940 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
941 u_ccbh = &descr->user_ccb->ccb_h;
942
943 /* Copy out the central portion of the ccb_hdr */
944 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
945 offsetof(struct ccb_hdr, periph_priv) -
946 offsetof(struct ccb_hdr, retry_count));
947
948 /* Copy out the rest of the ccb (after the ccb_hdr) */
949 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
950 if (descr->mapinfo.num_bufs_used != 0)
951 cam_periph_unmapmem(ccb, &descr->mapinfo);
952 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
953 if (error != 0) {
954 xpt_print_path(softc->path);
955 printf("targreturnccb - CCB copyout failed (%d)\n",
956 error);
957 }
958 /* Free CCB or send back to devq. */
959 targfreeccb(softc, ccb);
960
961 return (error);
962}
963
964static union ccb *
965targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
966{
967 union ccb *ccb;
968 int ccb_len;
969
970 ccb_len = targccblen(type);
971 MALLOC(ccb, union ccb *, ccb_len, M_TARG, M_WAITOK);
972 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
973
974 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
975 ccb->ccb_h.func_code = type;
976 ccb->ccb_h.cbfcnp = targdone;
977 ccb->ccb_h.targ_descr = targgetdescr(softc);
978 return (ccb);
979}
980
981static void
982targfreeccb(struct targ_softc *softc, union ccb *ccb)
983{
984 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
985 ccb->ccb_h.targ_descr));
986 FREE(ccb->ccb_h.targ_descr, M_TARG);
987
988 switch (ccb->ccb_h.func_code) {
989 case XPT_ACCEPT_TARGET_IO:
990 case XPT_IMMED_NOTIFY:
991 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
992 FREE(ccb, M_TARG);
993 break;
994 default:
995 /* Send back CCB if we got it from the periph */
996 if (XPT_FC_IS_QUEUED(ccb)) {
997 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
998 ("returning queued ccb %p\n", ccb));
999 xpt_release_ccb(ccb);
1000 } else {
1001 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1002 ("freeing ccb %p\n", ccb));
1003 FREE(ccb, M_TARG);
1004 }
1005 break;
1006 }
1007}
1008
1009static struct targ_cmd_descr *
1010targgetdescr(struct targ_softc *softc)
1011{
1012 struct targ_cmd_descr *descr;
1013
1014 MALLOC(descr, struct targ_cmd_descr *, sizeof(*descr), M_TARG,
1015 M_WAITOK);
1016 descr->mapinfo.num_bufs_used = 0;
1017 return (descr);
1018}
1019
1020static void
1021targinit(void)
1022{
1023 mtx_init(&targ_mtx, "targ global", NULL, MTX_DEF);
1024 EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
1025}
1026
1027static void
1028targclone(void *arg, char *name, int namelen, struct cdev **dev)
1029{
1030 int u;
1031
1032 if (*dev != NULL)
1033 return;
1034 if (dev_stdclone(name, NULL, "targ", &u) != 1)
1035 return;
1036 *dev = make_dev(&targ_cdevsw, unit2minor(u), UID_ROOT, GID_WHEEL,
1037 0600, "targ%d", u);
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