1/*-
2 * Implementation of SCSI Processor Target Peripheral driver for CAM.
3 *
4 * Copyright (c) 1998 Justin T. Gibbs.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions

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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_pt.c 164906 2006-12-05 07:45:28Z mjacob $");
31
32#include <sys/param.h>
33#include <sys/queue.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/types.h>
37#include <sys/bio.h>
38#include <sys/devicestat.h>

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114 TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
115};
116
117PERIPHDRIVER_DECLARE(pt, ptdriver);
118
119
120static struct cdevsw pt_cdevsw = {
121 .d_version = D_VERSION,
122 .d_flags = D_NEEDGIANT,
123 .d_open = ptopen,
124 .d_close = ptclose,
125 .d_read = physread,
126 .d_write = physwrite,
127 .d_ioctl = ptioctl,
128 .d_strategy = ptstrategy,
129 .d_name = "pt",
130};
131
132#ifndef SCSI_PT_DEFAULT_TIMEOUT
133#define SCSI_PT_DEFAULT_TIMEOUT 60
134#endif
135
136static int
137ptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
138{
139 struct cam_periph *periph;
140 struct pt_softc *softc;
141 int unit;
142 int error;
143 int s;
144
145 unit = minor(dev);
146 periph = (struct cam_periph *)dev->si_drv1;
147 if (periph == NULL)
148 return (ENXIO);
149
150 softc = (struct pt_softc *)periph->softc;
151
152 s = splsoftcam();
153 if (softc->flags & PT_FLAG_DEVICE_INVALID) {
154 splx(s);
155 return(ENXIO);
156 }
157
158 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
159 ("ptopen: dev=%s (unit %d)\n", devtoname(dev), unit));
160
161 if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) {
162 splx(s);
163 return (error); /* error code from tsleep */
164 }
165
166 splx(s);
167
168 if ((softc->flags & PT_FLAG_OPEN) == 0) {
169 if (cam_periph_acquire(periph) != CAM_REQ_CMP)
170 error = ENXIO;
171 else
172 softc->flags |= PT_FLAG_OPEN;
173 } else
174 error = EBUSY;
175
176 cam_periph_unlock(periph);
177 return (error);
178}
179
180static int
181ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
182{
183 struct cam_periph *periph;
184 struct pt_softc *softc;
185 int error;
186
187 periph = (struct cam_periph *)dev->si_drv1;
188 if (periph == NULL)
189 return (ENXIO);
190
191 softc = (struct pt_softc *)periph->softc;
192
193 if ((error = cam_periph_lock(periph, PRIBIO)) != 0)
194 return (error); /* error code from tsleep */
195
196 softc->flags &= ~PT_FLAG_OPEN;
197 cam_periph_unlock(periph);
198 cam_periph_release(periph);
199 return (0);
200}
201
202/*
203 * Actually translate the requested transfer into one the physical driver
204 * can understand. The transfer is described by a buf and will include
205 * only one physical transfer.
206 */
207static void
208ptstrategy(struct bio *bp)
209{
210 struct cam_periph *periph;
211 struct pt_softc *softc;
212 int s;
213
214 periph = (struct cam_periph *)bp->bio_dev->si_drv1;
215 bp->bio_resid = bp->bio_bcount;
216 if (periph == NULL) {
217 biofinish(bp, NULL, ENXIO);
218 return;
219 }
220 softc = (struct pt_softc *)periph->softc;
221
222 /*
223 * Mask interrupts so that the pack cannot be invalidated until
224 * after we are in the queue. Otherwise, we might not properly
225 * clean up one of the buffers.
226 */
227 s = splbio();
228
229 /*
230 * If the device has been made invalid, error out
231 */
232 if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
233 splx(s);
234 biofinish(bp, NULL, ENXIO);
235 return;
236 }
237
238 /*
239 * Place it in the queue of disk activities for this disk
240 */
241 bioq_insert_tail(&softc->bio_queue, bp);
242
243 splx(s);
244
245 /*
246 * Schedule ourselves for performing the work.
247 */
248 xpt_schedule(periph, /* XXX priority */1);
249
250 return;
251}
252
253static void
254ptinit(void)
255{
256 cam_status status;

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347 xpt_announce_periph(periph, NULL);
348
349 return(CAM_REQ_CMP);
350}
351
352static void
353ptoninvalidate(struct cam_periph *periph)
354{
355 int s;
356 struct pt_softc *softc;
357 struct ccb_setasync csa;
358
359 softc = (struct pt_softc *)periph->softc;
360
361 /*
362 * De-register any async callbacks.
363 */
364 xpt_setup_ccb(&csa.ccb_h, periph->path,
365 /* priority */ 5);
366 csa.ccb_h.func_code = XPT_SASYNC_CB;
367 csa.event_enable = 0;
368 csa.callback = ptasync;
369 csa.callback_arg = periph;
370 xpt_action((union ccb *)&csa);
371
372 softc->flags |= PT_FLAG_DEVICE_INVALID;
373
374 /*
375 * Although the oninvalidate() routines are always called at
376 * splsoftcam, we need to be at splbio() here to keep the buffer
377 * queue from being modified while we traverse it.
378 */
379 s = splbio();
380
381 /*
382 * Return all queued I/O with ENXIO.
383 * XXX Handle any transactions queued to the card
384 * with XPT_ABORT_CCB.
385 */
386 bioq_flush(&softc->bio_queue, NULL, ENXIO);
387
388 splx(s);
389
390 xpt_print(periph->path, "lost device\n");
391}
392
393static void
394ptdtor(struct cam_periph *periph)
395{
396 struct pt_softc *softc;
397

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440 "due to status 0x%x\n", status);
441 break;
442 }
443 case AC_SENT_BDR:
444 case AC_BUS_RESET:
445 {
446 struct pt_softc *softc;
447 struct ccb_hdr *ccbh;
448 int s;
449
450 softc = (struct pt_softc *)periph->softc;
451 s = splsoftcam();
452 /*
453 * Don't fail on the expected unit attention
454 * that will occur.
455 */
456 softc->flags |= PT_FLAG_RETRY_UA;
457 LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
458 ccbh->ccb_state |= PT_CCB_RETRY_UA;
459 splx(s);
460 }
461 /* FALLTHROUGH */
462 default:
463 cam_periph_async(periph, code, path, arg);
464 break;
465 }
466}
467
468static void
469ptstart(struct cam_periph *periph, union ccb *start_ccb)
470{
471 struct pt_softc *softc;
472 struct bio *bp;
473 int s;
474
475 softc = (struct pt_softc *)periph->softc;
476
477 /*
478 * See if there is a buf with work for us to do..
479 */
480 s = splbio();
481 bp = bioq_first(&softc->bio_queue);
482 if (periph->immediate_priority <= periph->pinfo.priority) {
483 CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
484 ("queuing for immediate ccb\n"));
485 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
486 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
487 periph_links.sle);
488 periph->immediate_priority = CAM_PRIORITY_NONE;
489 splx(s);
490 wakeup(&periph->ccb_list);
491 } else if (bp == NULL) {
492 splx(s);
493 xpt_release_ccb(start_ccb);
494 } else {
495 int oldspl;
496
497 bioq_remove(&softc->bio_queue, bp);
498
499 devstat_start_transaction_bio(softc->device_stats, bp);
500
501 scsi_send_receive(&start_ccb->csio,
502 /*retries*/4,
503 ptdone,
504 MSG_SIMPLE_Q_TAG,

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510 /*timeout*/softc->io_timeout);
511
512 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
513
514 /*
515 * Block out any asyncronous callbacks
516 * while we touch the pending ccb list.
517 */
518 oldspl = splcam();
519 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
520 periph_links.le);
521 splx(oldspl);
522
523 start_ccb->ccb_h.ccb_bp = bp;
524 bp = bioq_first(&softc->bio_queue);
525 splx(s);
526
527 xpt_action(start_ccb);
528
529 if (bp != NULL) {
530 /* Have more work to do, so ensure we stay scheduled */
531 xpt_schedule(periph, /* XXX priority */1);
532 }
533 }

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541
542 softc = (struct pt_softc *)periph->softc;
543 csio = &done_ccb->csio;
544 switch (csio->ccb_h.ccb_state) {
545 case PT_CCB_BUFFER_IO:
546 case PT_CCB_BUFFER_IO_UA:
547 {
548 struct bio *bp;
549 int oldspl;
550
551 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
552 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
553 int error;
554 int s;
555 int sf;
556
557 if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
558 sf = SF_RETRY_UA;
559 else
560 sf = 0;
561
562 error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
563 if (error == ERESTART) {
564 /*
565 * A retry was scheuled, so
566 * just return.
567 */
568 return;
569 }
570 if (error != 0) {
571 s = splbio();
572
573 if (error == ENXIO) {
574 /*
575 * Catastrophic error. Mark our device
576 * as invalid.
577 */
578 xpt_print(periph->path,
579 "Invalidating device\n");
580 softc->flags |= PT_FLAG_DEVICE_INVALID;
581 }
582
583 /*
584 * return all queued I/O with EIO, so that
585 * the client can retry these I/Os in the
586 * proper order should it attempt to recover.
587 */
588 bioq_flush(&softc->bio_queue, NULL, EIO);
589 splx(s);
590 bp->bio_error = error;
591 bp->bio_resid = bp->bio_bcount;
592 bp->bio_flags |= BIO_ERROR;
593 } else {
594 bp->bio_resid = csio->resid;
595 bp->bio_error = 0;
596 if (bp->bio_resid != 0) {
597 /* Short transfer ??? */

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609 if (bp->bio_resid != 0)
610 bp->bio_flags |= BIO_ERROR;
611 }
612
613 /*
614 * Block out any asyncronous callbacks
615 * while we touch the pending ccb list.
616 */
617 oldspl = splcam();
618 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
619 splx(oldspl);
620
621 biofinish(bp, softc->device_stats, 0);
622 break;
623 }
624 case PT_CCB_WAITING:
625 /* Caller will release the CCB */
626 wakeup(&done_ccb->ccb_h.cbfcnp);
627 return;

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642 &softc->saved_ccb));
643}
644
645static int
646ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
647{
648 struct cam_periph *periph;
649 struct pt_softc *softc;
650 int error;
651
652 periph = (struct cam_periph *)dev->si_drv1;
653 if (periph == NULL)
654 return(ENXIO);
655
656 softc = (struct pt_softc *)periph->softc;
657
658 if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) {
659 return (error); /* error code from tsleep */
660 }
661
662 switch(cmd) {
663 case PTIOCGETTIMEOUT:
664 if (softc->io_timeout >= 1000)
665 *(int *)addr = softc->io_timeout / 1000;
666 else
667 *(int *)addr = 0;
668 break;
669 case PTIOCSETTIMEOUT:
670 {
671 int s;
672
673 if (*(int *)addr < 1) {
674 error = EINVAL;
675 break;
676 }
677
678 s = splsoftcam();
679 softc->io_timeout = *(int *)addr * 1000;
680 splx(s);
681
682 break;
683 }
684 default:
685 error = cam_periph_ioctl(periph, cmd, addr, pterror);
686 break;
687 }
688
689 cam_periph_unlock(periph);
690
691 return(error);

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