2 * Generic SCSI Target Kernel Mode Driver
4 * Copyright (c) 2002 Nate Lawson.
5 * Copyright (c) 1998, 1999, 2001, 2002 Justin T. Gibbs.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions, and the following disclaimer,
13 * without modification, immediately at the beginning of the file.
14 * 2. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
38 #include <sys/malloc.h>
40 #include <sys/vnode.h>
42 #include <sys/mutex.h>
43 #include <sys/devicestat.h>
45 /* Includes to support callout */
46 #include <sys/types.h>
47 #include <sys/systm.h>
50 #include <cam/cam_ccb.h>
51 #include <cam/cam_periph.h>
52 #include <cam/cam_xpt_periph.h>
53 #include <cam/cam_sim.h>
54 #include <cam/scsi/scsi_targetio.h>
57 /* Transaction information attached to each CCB sent by the user */
58 struct targ_cmd_descr {
59 struct cam_periph_map_info mapinfo;
60 TAILQ_ENTRY(targ_cmd_descr) tqe;
66 /* Offset into the private CCB area for storing our descriptor */
67 #define targ_descr periph_priv.entries[1].ptr
69 TAILQ_HEAD(descr_queue, targ_cmd_descr);
72 TARG_STATE_RESV = 0x00, /* Invalid state */
73 TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */
74 TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */
77 /* Per-instance device software context */
79 /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */
80 struct ccb_queue pending_ccb_queue;
82 /* Command descriptors awaiting CTIO resources from the XPT */
83 struct descr_queue work_queue;
85 /* Command descriptors that have been aborted back to the user. */
86 struct descr_queue abort_queue;
89 * Queue of CCBs that have been copied out to userland, but our
90 * userland daemon has not yet seen.
92 struct ccb_queue user_ccb_queue;
94 struct cam_periph *periph;
95 struct cam_path *path;
97 struct selinfo read_select;
98 struct devstat device_stats;
99 struct callout destroy_dev_callout;
100 struct mtx destroy_mtx;
103 static d_open_t targopen;
104 static d_close_t targclose;
105 static d_read_t targread;
106 static d_write_t targwrite;
107 static d_ioctl_t targioctl;
108 static d_poll_t targpoll;
109 static d_kqfilter_t targkqfilter;
110 static void targreadfiltdetach(struct knote *kn);
111 static int targreadfilt(struct knote *kn, long hint);
112 static struct filterops targread_filtops = {
114 .f_detach = targreadfiltdetach,
115 .f_event = targreadfilt,
118 static struct cdevsw targ_cdevsw = {
119 .d_version = D_VERSION,
120 .d_flags = D_NEEDGIANT,
122 .d_close = targclose,
124 .d_write = targwrite,
125 .d_ioctl = targioctl,
128 .d_kqfilter = targkqfilter
131 static cam_status targendislun(struct cam_path *path, int enable,
132 int grp6_len, int grp7_len);
133 static cam_status targenable(struct targ_softc *softc,
134 struct cam_path *path,
135 int grp6_len, int grp7_len);
136 static cam_status targdisable(struct targ_softc *softc);
137 static periph_ctor_t targctor;
138 static periph_dtor_t targdtor;
139 static periph_start_t targstart;
140 static int targusermerge(struct targ_softc *softc,
141 struct targ_cmd_descr *descr,
143 static int targsendccb(struct targ_softc *softc, union ccb *ccb,
144 struct targ_cmd_descr *descr);
145 static void targdone(struct cam_periph *periph,
146 union ccb *done_ccb);
147 static int targreturnccb(struct targ_softc *softc,
149 static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type,
151 static void targfreeccb(struct targ_softc *softc, union ccb *ccb);
152 static struct targ_cmd_descr *
153 targgetdescr(struct targ_softc *softc);
154 static periph_init_t targinit;
155 static void targclone(void *arg, struct ucred *cred, char *name,
156 int namelen, struct cdev **dev);
157 static void targasync(void *callback_arg, u_int32_t code,
158 struct cam_path *path, void *arg);
159 static void abort_all_pending(struct targ_softc *softc);
160 static void notify_user(struct targ_softc *softc);
161 static int targcamstatus(cam_status status);
162 static size_t targccblen(xpt_opcode func_code);
163 static void targdestroy(void *);
165 static struct periph_driver targdriver =
168 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0
170 PERIPHDRIVER_DECLARE(targ, targdriver);
172 static MALLOC_DEFINE(M_TARG, "TARG", "TARG data");
175 * Create softc and initialize it. Only one proc can open each targ device.
176 * There is no locking here because a periph doesn't get created until an
177 * ioctl is issued to do so, and that can't happen until this method returns.
180 targopen(struct cdev *dev, int flags, int fmt, struct thread *td)
182 struct targ_softc *softc;
184 if (dev->si_drv1 != 0) {
188 /* Mark device busy before any potentially blocking operations */
189 dev->si_drv1 = (void *)~0;
191 /* Create the targ device, allocate its softc, initialize it */
192 if ((dev->si_flags & SI_NAMED) == 0) {
193 make_dev(&targ_cdevsw, dev2unit(dev), UID_ROOT, GID_WHEEL, 0600,
194 "targ%d", dev2unit(dev));
196 softc = malloc(sizeof(*softc), M_TARG,
198 dev->si_drv1 = softc;
199 softc->state = TARG_STATE_OPENED;
200 softc->periph = NULL;
203 TAILQ_INIT(&softc->pending_ccb_queue);
204 TAILQ_INIT(&softc->work_queue);
205 TAILQ_INIT(&softc->abort_queue);
206 TAILQ_INIT(&softc->user_ccb_queue);
207 knlist_init_mtx(&softc->read_select.si_note, NULL);
212 /* Disable LUN if enabled and teardown softc */
214 targclose(struct cdev *dev, int flag, int fmt, struct thread *td)
216 struct targ_softc *softc;
217 struct cam_periph *periph;
220 softc = (struct targ_softc *)dev->si_drv1;
221 mtx_init(&softc->destroy_mtx, "targ_destroy", "SCSI Target dev destroy", MTX_DEF);
222 callout_init_mtx(&softc->destroy_dev_callout, &softc->destroy_mtx, CALLOUT_RETURNUNLOCKED);
223 if (softc->periph == NULL) {
228 printf("%s: destroying non-enabled target\n", __func__);
229 mtx_lock(&softc->destroy_mtx);
230 callout_reset(&softc->destroy_dev_callout, hz / 2,
231 (void *)targdestroy, (void *)dev);
232 mtx_unlock(&softc->destroy_mtx);
237 * Acquire a hold on the periph so that it doesn't go away before
238 * we are ready at the end of the function.
240 periph = softc->periph;
241 cam_periph_acquire(periph);
242 cam_periph_lock(periph);
243 error = targdisable(softc);
244 if (softc->periph != NULL) {
245 cam_periph_invalidate(softc->periph);
246 softc->periph = NULL;
248 cam_periph_unlock(periph);
249 cam_periph_release(periph);
256 printf("%s: close finished error(%d)\n", __func__, error);
257 mtx_lock(&softc->destroy_mtx);
258 callout_reset(&softc->destroy_dev_callout, hz / 2,
259 (void *)targdestroy, (void *)dev);
260 mtx_unlock(&softc->destroy_mtx);
264 /* Enable/disable LUNs, set debugging level */
266 targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
268 struct targ_softc *softc;
271 softc = (struct targ_softc *)dev->si_drv1;
276 struct ioc_enable_lun *new_lun;
277 struct cam_path *path;
280 new_lun = (struct ioc_enable_lun *)addr;
281 status = xpt_create_path_unlocked(&path, /*periph*/NULL,
285 if (status != CAM_REQ_CMP) {
286 printf("Couldn't create path, status %#x\n", status);
289 sim = xpt_path_sim(path);
291 status = targenable(softc, path, new_lun->grp6_len,
294 mtx_unlock(sim->mtx);
298 if (softc->periph == NULL) {
299 status = CAM_DEV_NOT_THERE;
302 cam_periph_lock(softc->periph);
303 status = targdisable(softc);
304 cam_periph_unlock(softc->periph);
308 struct ccb_debug cdbg;
310 /* If no periph available, disallow debugging changes */
311 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
312 status = CAM_DEV_NOT_THERE;
315 bzero(&cdbg, sizeof cdbg);
316 if (*((int *)addr) != 0)
317 cdbg.flags = CAM_DEBUG_PERIPH;
319 cdbg.flags = CAM_DEBUG_NONE;
320 cam_periph_lock(softc->periph);
321 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
322 cdbg.ccb_h.func_code = XPT_DEBUG;
323 cdbg.ccb_h.cbfcnp = targdone;
325 xpt_action((union ccb *)&cdbg);
326 cam_periph_unlock(softc->periph);
327 status = cdbg.ccb_h.status & CAM_STATUS_MASK;
331 status = CAM_PROVIDE_FAIL;
335 return (targcamstatus(status));
338 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */
340 targpoll(struct cdev *dev, int poll_events, struct thread *td)
342 struct targ_softc *softc;
345 softc = (struct targ_softc *)dev->si_drv1;
347 /* Poll for write() is always ok. */
348 revents = poll_events & (POLLOUT | POLLWRNORM);
349 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) {
350 /* Poll for read() depends on user and abort queues. */
351 cam_periph_lock(softc->periph);
352 if (!TAILQ_EMPTY(&softc->user_ccb_queue) ||
353 !TAILQ_EMPTY(&softc->abort_queue)) {
354 revents |= poll_events & (POLLIN | POLLRDNORM);
356 cam_periph_unlock(softc->periph);
357 /* Only sleep if the user didn't poll for write. */
359 selrecord(td, &softc->read_select);
366 targkqfilter(struct cdev *dev, struct knote *kn)
368 struct targ_softc *softc;
370 softc = (struct targ_softc *)dev->si_drv1;
371 kn->kn_hook = (caddr_t)softc;
372 kn->kn_fop = &targread_filtops;
373 knlist_add(&softc->read_select.si_note, kn, 0);
378 targreadfiltdetach(struct knote *kn)
380 struct targ_softc *softc;
382 softc = (struct targ_softc *)kn->kn_hook;
383 knlist_remove(&softc->read_select.si_note, kn, 0);
386 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */
388 targreadfilt(struct knote *kn, long hint)
390 struct targ_softc *softc;
393 softc = (struct targ_softc *)kn->kn_hook;
394 cam_periph_lock(softc->periph);
395 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) ||
396 !TAILQ_EMPTY(&softc->abort_queue);
397 cam_periph_unlock(softc->periph);
401 /* Send the HBA the enable/disable message */
403 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len)
405 struct ccb_en_lun en_ccb;
408 /* Tell the lun to begin answering selects */
409 xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL);
410 en_ccb.ccb_h.func_code = XPT_EN_LUN;
411 /* Don't need support for any vendor specific commands */
412 en_ccb.grp6_len = grp6_len;
413 en_ccb.grp7_len = grp7_len;
414 en_ccb.enable = enable ? 1 : 0;
415 xpt_action((union ccb *)&en_ccb);
416 status = en_ccb.ccb_h.status & CAM_STATUS_MASK;
417 if (status != CAM_REQ_CMP) {
418 xpt_print(path, "%sable lun CCB rejected, status %#x\n",
419 enable ? "en" : "dis", status);
424 /* Enable target mode on a LUN, given its path */
426 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len,
429 struct cam_periph *periph;
430 struct ccb_pathinq cpi;
433 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0)
434 return (CAM_LUN_ALRDY_ENA);
436 /* Make sure SIM supports target mode */
437 xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL);
438 cpi.ccb_h.func_code = XPT_PATH_INQ;
439 xpt_action((union ccb *)&cpi);
440 status = cpi.ccb_h.status & CAM_STATUS_MASK;
441 if (status != CAM_REQ_CMP) {
442 printf("pathinq failed, status %#x\n", status);
445 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
446 printf("controller does not support target mode\n");
447 status = CAM_FUNC_NOTAVAIL;
451 /* Destroy any periph on our path if it is disabled */
452 periph = cam_periph_find(path, "targ");
453 if (periph != NULL) {
454 struct targ_softc *del_softc;
456 del_softc = (struct targ_softc *)periph->softc;
457 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) {
458 cam_periph_invalidate(del_softc->periph);
459 del_softc->periph = NULL;
461 printf("Requested path still in use by targ%d\n",
462 periph->unit_number);
463 status = CAM_LUN_ALRDY_ENA;
468 /* Create a periph instance attached to this path */
469 status = cam_periph_alloc(targctor, NULL, targdtor, targstart,
470 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc);
471 if (status != CAM_REQ_CMP) {
472 printf("cam_periph_alloc failed, status %#x\n", status);
476 /* Ensure that the periph now exists. */
477 if (cam_periph_find(path, "targ") == NULL) {
478 panic("targenable: succeeded but no periph?");
482 /* Send the enable lun message */
483 status = targendislun(path, /*enable*/1, grp6_len, grp7_len);
484 if (status != CAM_REQ_CMP) {
485 printf("enable lun failed, status %#x\n", status);
488 softc->state |= TARG_STATE_LUN_ENABLED;
494 /* Disable this softc's target instance if enabled */
496 targdisable(struct targ_softc *softc)
500 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0)
501 return (CAM_REQ_CMP);
503 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n"));
505 /* Abort any ccbs pending on the controller */
506 abort_all_pending(softc);
508 /* Disable this lun */
509 status = targendislun(softc->path, /*enable*/0,
510 /*grp6_len*/0, /*grp7_len*/0);
511 if (status == CAM_REQ_CMP)
512 softc->state &= ~TARG_STATE_LUN_ENABLED;
514 printf("Disable lun failed, status %#x\n", status);
519 /* Initialize a periph (called from cam_periph_alloc) */
521 targctor(struct cam_periph *periph, void *arg)
523 struct targ_softc *softc;
525 /* Store pointer to softc for periph-driven routines */
526 softc = (struct targ_softc *)arg;
527 periph->softc = softc;
528 softc->periph = periph;
529 softc->path = periph->path;
530 return (CAM_REQ_CMP);
534 targdtor(struct cam_periph *periph)
536 struct targ_softc *softc;
537 struct ccb_hdr *ccb_h;
538 struct targ_cmd_descr *descr;
540 softc = (struct targ_softc *)periph->softc;
543 * targdisable() aborts CCBs back to the user and leaves them
544 * on user_ccb_queue and abort_queue in case the user is still
545 * interested in them. We free them now.
547 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) {
548 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe);
549 targfreeccb(softc, (union ccb *)ccb_h);
551 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) {
552 TAILQ_REMOVE(&softc->abort_queue, descr, tqe);
556 softc->periph = NULL;
558 periph->softc = NULL;
561 /* Receive CCBs from user mode proc and send them to the HBA */
563 targwrite(struct cdev *dev, struct uio *uio, int ioflag)
566 struct targ_softc *softc;
567 struct targ_cmd_descr *descr;
568 int write_len, error;
569 int func_code, priority;
571 softc = (struct targ_softc *)dev->si_drv1;
572 write_len = error = 0;
573 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
574 ("write - uio_resid %zd\n", uio->uio_resid));
575 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) {
578 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
580 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
581 ("write - uiomove failed (%d)\n", error));
584 priority = fuword32(&user_ccb->ccb_h.pinfo.priority);
585 if (priority == CAM_PRIORITY_NONE) {
589 func_code = fuword32(&user_ccb->ccb_h.func_code);
591 case XPT_ACCEPT_TARGET_IO:
592 case XPT_IMMED_NOTIFY:
593 cam_periph_lock(softc->periph);
594 ccb = targgetccb(softc, func_code, priority);
595 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
596 descr->user_ccb = user_ccb;
597 descr->func_code = func_code;
598 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
599 ("Sent ATIO/INOT (%p)\n", user_ccb));
601 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue,
604 cam_periph_unlock(softc->periph);
607 cam_periph_lock(softc->periph);
608 if ((func_code & XPT_FC_QUEUED) != 0) {
609 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
610 ("Sending queued ccb %#x (%p)\n",
611 func_code, user_ccb));
612 descr = targgetdescr(softc);
613 descr->user_ccb = user_ccb;
614 descr->priority = priority;
615 descr->func_code = func_code;
616 TAILQ_INSERT_TAIL(&softc->work_queue,
618 xpt_schedule(softc->periph, priority);
620 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
621 ("Sending inline ccb %#x (%p)\n",
622 func_code, user_ccb));
623 ccb = targgetccb(softc, func_code, priority);
624 descr = (struct targ_cmd_descr *)
625 ccb->ccb_h.targ_descr;
626 descr->user_ccb = user_ccb;
627 descr->priority = priority;
628 descr->func_code = func_code;
629 if (targusermerge(softc, descr, ccb) != EFAULT)
630 targsendccb(softc, ccb, descr);
631 targreturnccb(softc, ccb);
633 cam_periph_unlock(softc->periph);
636 write_len += sizeof(user_ccb);
640 * If we've successfully taken in some amount of
641 * data, return success for that data first. If
642 * an error is persistent, it will be reported
645 if (error != 0 && write_len == 0)
647 if (write_len == 0 && uio->uio_resid != 0)
652 /* Process requests (descrs) via the periph-supplied CCBs */
654 targstart(struct cam_periph *periph, union ccb *start_ccb)
656 struct targ_softc *softc;
657 struct targ_cmd_descr *descr, *next_descr;
660 softc = (struct targ_softc *)periph->softc;
661 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb));
663 descr = TAILQ_FIRST(&softc->work_queue);
665 xpt_release_ccb(start_ccb);
667 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
668 next_descr = TAILQ_FIRST(&softc->work_queue);
670 /* Initiate a transaction using the descr and supplied CCB */
671 error = targusermerge(softc, descr, start_ccb);
673 error = targsendccb(softc, start_ccb, descr);
675 xpt_print(periph->path,
676 "targsendccb failed, err %d\n", error);
677 xpt_release_ccb(start_ccb);
678 suword(&descr->user_ccb->ccb_h.status,
680 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
684 /* If we have more work to do, stay scheduled */
685 if (next_descr != NULL)
686 xpt_schedule(periph, next_descr->priority);
691 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr,
694 struct ccb_hdr *u_ccbh, *k_ccbh;
698 u_ccbh = &descr->user_ccb->ccb_h;
699 k_ccbh = &ccb->ccb_h;
702 * There are some fields in the CCB header that need to be
703 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb)
705 xpt_setup_ccb(k_ccbh, softc->path, descr->priority);
706 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count);
707 k_ccbh->func_code = descr->func_code;
708 k_ccbh->flags = fuword32(&u_ccbh->flags);
709 k_ccbh->timeout = fuword32(&u_ccbh->timeout);
710 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr);
711 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len);
713 k_ccbh->status = CAM_REQ_CMP_ERR;
717 /* Translate usermode abort_ccb pointer to its kernel counterpart */
718 if (k_ccbh->func_code == XPT_ABORT) {
719 struct ccb_abort *cab;
720 struct ccb_hdr *ccb_h;
722 cab = (struct ccb_abort *)ccb;
723 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue,
725 struct targ_cmd_descr *ab_descr;
727 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
728 if (ab_descr->user_ccb == cab->abort_ccb) {
729 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
730 ("Changing abort for %p to %p\n",
731 cab->abort_ccb, ccb_h));
732 cab->abort_ccb = (union ccb *)ccb_h;
736 /* CCB not found, set appropriate status */
738 k_ccbh->status = CAM_PATH_INVALID;
746 /* Build and send a kernel CCB formed from descr->user_ccb */
748 targsendccb(struct targ_softc *softc, union ccb *ccb,
749 struct targ_cmd_descr *descr)
751 struct cam_periph_map_info *mapinfo;
752 struct ccb_hdr *ccb_h;
756 mapinfo = &descr->mapinfo;
757 mapinfo->num_bufs_used = 0;
760 * There's no way for the user to have a completion
761 * function, so we put our own completion function in here.
762 * We also stash in a reference to our descriptor so targreturnccb()
763 * can find our mapping info.
765 ccb_h->cbfcnp = targdone;
766 ccb_h->targ_descr = descr;
768 if ((ccb_h->func_code == XPT_CONT_TARGET_IO) ||
769 (ccb_h->func_code == XPT_DEV_MATCH)) {
771 error = cam_periph_mapmem(ccb, mapinfo);
774 * cam_periph_mapmem returned an error, we can't continue.
775 * Return the error to the user.
778 ccb_h->status = CAM_REQ_CMP_ERR;
779 mapinfo->num_bufs_used = 0;
785 * Once queued on the pending CCB list, this CCB will be protected
786 * by our error recovery handler.
788 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb));
789 if (XPT_FC_IS_QUEUED(ccb)) {
790 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h,
798 /* Completion routine for CCBs (called at splsoftcam) */
800 targdone(struct cam_periph *periph, union ccb *done_ccb)
802 struct targ_softc *softc;
805 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb));
806 softc = (struct targ_softc *)periph->softc;
807 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h,
809 status = done_ccb->ccb_h.status & CAM_STATUS_MASK;
811 /* If we're no longer enabled, throw away CCB */
812 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) {
813 targfreeccb(softc, done_ccb);
816 /* abort_all_pending() waits for pending queue to be empty */
817 if (TAILQ_EMPTY(&softc->pending_ccb_queue))
818 wakeup(&softc->pending_ccb_queue);
820 switch (done_ccb->ccb_h.func_code) {
821 /* All FC_*_QUEUED CCBs go back to userland */
822 case XPT_IMMED_NOTIFY:
823 case XPT_ACCEPT_TARGET_IO:
824 case XPT_CONT_TARGET_IO:
825 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h,
827 cam_periph_unlock(softc->periph);
829 cam_periph_lock(softc->periph);
832 panic("targdone: impossible xpt opcode %#x",
833 done_ccb->ccb_h.func_code);
838 /* Return CCBs to the user from the user queue and abort queue */
840 targread(struct cdev *dev, struct uio *uio, int ioflag)
842 struct descr_queue *abort_queue;
843 struct targ_cmd_descr *user_descr;
844 struct targ_softc *softc;
845 struct ccb_queue *user_queue;
846 struct ccb_hdr *ccb_h;
852 softc = (struct targ_softc *)dev->si_drv1;
853 user_queue = &softc->user_ccb_queue;
854 abort_queue = &softc->abort_queue;
855 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n"));
857 /* If no data is available, wait or return immediately */
858 cam_periph_lock(softc->periph);
859 ccb_h = TAILQ_FIRST(user_queue);
860 user_descr = TAILQ_FIRST(abort_queue);
861 while (ccb_h == NULL && user_descr == NULL) {
862 if ((ioflag & IO_NDELAY) == 0) {
863 error = msleep(user_queue, softc->periph->sim->mtx,
864 PRIBIO | PCATCH, "targrd", 0);
865 ccb_h = TAILQ_FIRST(user_queue);
866 user_descr = TAILQ_FIRST(abort_queue);
868 if (error == ERESTART) {
875 cam_periph_unlock(softc->periph);
880 /* Data is available so fill the user's buffer */
881 while (ccb_h != NULL) {
882 struct targ_cmd_descr *descr;
884 if (uio->uio_resid < sizeof(user_ccb))
886 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe);
887 descr = (struct targ_cmd_descr *)ccb_h->targ_descr;
888 user_ccb = descr->user_ccb;
889 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
890 ("targread ccb %p (%p)\n", ccb_h, user_ccb));
891 error = targreturnccb(softc, (union ccb *)ccb_h);
894 cam_periph_unlock(softc->periph);
895 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
896 cam_periph_lock(softc->periph);
899 read_len += sizeof(user_ccb);
901 ccb_h = TAILQ_FIRST(user_queue);
904 /* Flush out any aborted descriptors */
905 while (user_descr != NULL) {
906 if (uio->uio_resid < sizeof(user_ccb))
908 TAILQ_REMOVE(abort_queue, user_descr, tqe);
909 user_ccb = user_descr->user_ccb;
910 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
911 ("targread aborted descr %p (%p)\n",
912 user_descr, user_ccb));
913 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED);
914 cam_periph_unlock(softc->periph);
915 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio);
916 cam_periph_lock(softc->periph);
919 read_len += sizeof(user_ccb);
921 user_descr = TAILQ_FIRST(abort_queue);
925 * If we've successfully read some amount of data, don't report an
926 * error. If the error is persistent, it will be reported on the
929 if (read_len == 0 && uio->uio_resid != 0)
933 cam_periph_unlock(softc->periph);
937 /* Copy completed ccb back to the user */
939 targreturnccb(struct targ_softc *softc, union ccb *ccb)
941 struct targ_cmd_descr *descr;
942 struct ccb_hdr *u_ccbh;
946 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb));
947 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr;
948 u_ccbh = &descr->user_ccb->ccb_h;
950 /* Copy out the central portion of the ccb_hdr */
951 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count,
952 offsetof(struct ccb_hdr, periph_priv) -
953 offsetof(struct ccb_hdr, retry_count));
955 /* Copy out the rest of the ccb (after the ccb_hdr) */
956 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr);
957 if (descr->mapinfo.num_bufs_used != 0)
958 cam_periph_unmapmem(ccb, &descr->mapinfo);
959 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len);
961 xpt_print(softc->path,
962 "targreturnccb - CCB copyout failed (%d)\n", error);
964 /* Free CCB or send back to devq. */
965 targfreeccb(softc, ccb);
971 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority)
976 ccb_len = targccblen(type);
977 ccb = malloc(ccb_len, M_TARG, M_NOWAIT);
978 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb));
982 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority);
983 ccb->ccb_h.func_code = type;
984 ccb->ccb_h.cbfcnp = targdone;
985 ccb->ccb_h.targ_descr = targgetdescr(softc);
986 if (ccb->ccb_h.targ_descr == NULL) {
994 targfreeccb(struct targ_softc *softc, union ccb *ccb)
996 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n",
997 ccb->ccb_h.targ_descr));
998 free(ccb->ccb_h.targ_descr, M_TARG);
1000 switch (ccb->ccb_h.func_code) {
1001 case XPT_ACCEPT_TARGET_IO:
1002 case XPT_IMMED_NOTIFY:
1003 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb));
1007 /* Send back CCB if we got it from the periph */
1008 if (XPT_FC_IS_QUEUED(ccb)) {
1009 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1010 ("returning queued ccb %p\n", ccb));
1011 xpt_release_ccb(ccb);
1013 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH,
1014 ("freeing ccb %p\n", ccb));
1021 static struct targ_cmd_descr *
1022 targgetdescr(struct targ_softc *softc)
1024 struct targ_cmd_descr *descr;
1026 descr = malloc(sizeof(*descr), M_TARG,
1029 descr->mapinfo.num_bufs_used = 0;
1037 EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000);
1041 targclone(void *arg, struct ucred *cred, char *name, int namelen,
1048 if (dev_stdclone(name, NULL, "targ", &u) != 1)
1050 *dev = make_dev(&targ_cdevsw, u, UID_ROOT, GID_WHEEL,
1053 (*dev)->si_flags |= SI_CHEAPCLONE;
1057 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
1059 /* All events are handled in usermode by INOTs */
1060 panic("targasync() called, should be an INOT instead");
1063 /* Cancel all pending requests and CCBs awaiting work. */
1065 abort_all_pending(struct targ_softc *softc)
1067 struct targ_cmd_descr *descr;
1068 struct ccb_abort cab;
1069 struct ccb_hdr *ccb_h;
1070 struct cam_sim *sim;
1072 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n"));
1074 /* First abort the descriptors awaiting resources */
1075 while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) {
1076 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1077 ("Aborting descr from workq %p\n", descr));
1078 TAILQ_REMOVE(&softc->work_queue, descr, tqe);
1079 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe);
1083 * Then abort all pending CCBs.
1084 * targdone() will return the aborted CCB via user_ccb_queue
1086 xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL);
1087 cab.ccb_h.func_code = XPT_ABORT;
1088 cab.ccb_h.status = CAM_REQ_CMP_ERR;
1089 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) {
1090 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH,
1091 ("Aborting pending CCB %p\n", ccb_h));
1092 cab.abort_ccb = (union ccb *)ccb_h;
1093 xpt_action((union ccb *)&cab);
1094 if (cab.ccb_h.status != CAM_REQ_CMP) {
1095 xpt_print(cab.ccb_h.path,
1096 "Unable to abort CCB, status %#x\n",
1101 /* If we aborted at least one pending CCB ok, wait for it. */
1102 if (cab.ccb_h.status == CAM_REQ_CMP) {
1103 sim = xpt_path_sim(softc->path);
1104 msleep(&softc->pending_ccb_queue, sim->mtx,
1105 PRIBIO | PCATCH, "tgabrt", 0);
1108 /* If we aborted anything from the work queue, wakeup user. */
1109 if (!TAILQ_EMPTY(&softc->user_ccb_queue)
1110 || !TAILQ_EMPTY(&softc->abort_queue)) {
1111 cam_periph_unlock(softc->periph);
1113 cam_periph_lock(softc->periph);
1117 /* Notify the user that data is ready */
1119 notify_user(struct targ_softc *softc)
1122 * Notify users sleeping via poll(), kqueue(), and
1125 selwakeuppri(&softc->read_select, PRIBIO);
1126 KNOTE_UNLOCKED(&softc->read_select.si_note, 0);
1127 wakeup(&softc->user_ccb_queue);
1130 /* Convert CAM status to errno values */
1132 targcamstatus(cam_status status)
1134 switch (status & CAM_STATUS_MASK) {
1135 case CAM_REQ_CMP: /* CCB request completed without error */
1137 case CAM_REQ_INPROG: /* CCB request is in progress */
1138 return (EINPROGRESS);
1139 case CAM_REQ_CMP_ERR: /* CCB request completed with an error */
1141 case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */
1143 case CAM_FUNC_NOTAVAIL: /* The requested function is not available */
1145 case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */
1146 return (EADDRINUSE);
1147 case CAM_PATH_INVALID: /* Supplied Path ID is invalid */
1148 case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */
1150 case CAM_REQ_ABORTED: /* CCB request aborted by the host */
1152 case CAM_CMD_TIMEOUT: /* Command timeout */
1154 case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */
1156 case CAM_REQ_INVALID: /* CCB request was invalid */
1158 case CAM_RESRC_UNAVAIL: /* Resource Unavailable */
1160 case CAM_BUSY: /* CAM subsystem is busy */
1161 case CAM_UA_ABORT: /* Unable to abort CCB request */
1169 targccblen(xpt_opcode func_code)
1173 /* Codes we expect to see as a target */
1174 switch (func_code) {
1175 case XPT_CONT_TARGET_IO:
1177 len = sizeof(struct ccb_scsiio);
1179 case XPT_ACCEPT_TARGET_IO:
1180 len = sizeof(struct ccb_accept_tio);
1182 case XPT_IMMED_NOTIFY:
1183 len = sizeof(struct ccb_immed_notify);
1186 len = sizeof(struct ccb_relsim);
1189 len = sizeof(struct ccb_pathinq);
1192 len = sizeof(struct ccb_debug);
1195 len = sizeof(struct ccb_abort);
1198 len = sizeof(struct ccb_en_lun);
1201 len = sizeof(union ccb);
1209 * work around to destroy targ device
1210 * outside of targclose
1213 targdestroy(void *dev)
1215 struct cdev *device = (struct cdev *)dev;
1216 struct targ_softc *softc = (struct targ_softc *)device->si_drv1;
1219 callout_stop(&softc->destroy_dev_callout);
1222 mtx_unlock(&softc->destroy_mtx);
1223 mtx_destroy(&softc->destroy_mtx);
1224 free(softc, M_TARG);
1225 device->si_drv1 = 0;
1226 destroy_dev(device);
1227 printf("%s: destroyed dev\n", __func__);