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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 $");
30__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_pt.c 168752 2007-04-15 08:49:19Z scottl $");
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,
122 .d_flags = 0,
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;
141 int error = 0;
142
145 unit = minor(dev);
143 periph = (struct cam_periph *)dev->si_drv1;
147 if (periph == NULL)
144 if (cam_periph_acquire(periph) != CAM_REQ_CMP)
145 return (ENXIO);
146
147 softc = (struct pt_softc *)periph->softc;
148
152 s = splsoftcam();
149 cam_periph_lock(periph);
150 if (softc->flags & PT_FLAG_DEVICE_INVALID) {
154 splx(s);
151 cam_periph_unlock(periph);
152 cam_periph_release(periph);
153 return(ENXIO);
154 }
155
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 */
156 if ((softc->flags & PT_FLAG_OPEN) == 0)
157 softc->flags |= PT_FLAG_OPEN;
158 else {
159 error = EBUSY;
160 cam_periph_release(periph);
161 }
162
166 splx(s);
163 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
164 ("ptopen: dev=%s\n", devtoname(dev)));
165
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
166 cam_periph_unlock(periph);
167 return (error);
168}
169
170static int
171ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
172{
173 struct cam_periph *periph;
174 struct pt_softc *softc;
185 int error;
175
176 periph = (struct cam_periph *)dev->si_drv1;
177 if (periph == NULL)
178 return (ENXIO);
179
180 softc = (struct pt_softc *)periph->softc;
181
193 if ((error = cam_periph_lock(periph, PRIBIO)) != 0)
194 return (error); /* error code from tsleep */
182 cam_periph_lock(periph);
183
184 softc->flags &= ~PT_FLAG_OPEN;
185 cam_periph_unlock(periph);
186 cam_periph_release(periph);
187 return (0);
188}
189
190/*
191 * Actually translate the requested transfer into one the physical driver
192 * can understand. The transfer is described by a buf and will include
193 * only one physical transfer.
194 */
195static void
196ptstrategy(struct bio *bp)
197{
198 struct cam_periph *periph;
199 struct pt_softc *softc;
212 int s;
200
201 periph = (struct cam_periph *)bp->bio_dev->si_drv1;
202 bp->bio_resid = bp->bio_bcount;
203 if (periph == NULL) {
204 biofinish(bp, NULL, ENXIO);
205 return;
206 }
207 cam_periph_lock(periph);
208 softc = (struct pt_softc *)periph->softc;
209
210 /*
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 /*
211 * If the device has been made invalid, error out
212 */
213 if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
233 splx(s);
214 cam_periph_unlock(periph);
215 biofinish(bp, NULL, ENXIO);
216 return;
217 }
218
219 /*
220 * Place it in the queue of disk activities for this disk
221 */
222 bioq_insert_tail(&softc->bio_queue, bp);
223
243 splx(s);
244
224 /*
225 * Schedule ourselves for performing the work.
226 */
227 xpt_schedule(periph, /* XXX priority */1);
228 cam_periph_unlock(periph);
229
230 return;
231}
232
233static void
234ptinit(void)
235{
236 cam_status status;

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327 xpt_announce_periph(periph, NULL);
328
329 return(CAM_REQ_CMP);
330}
331
332static void
333ptoninvalidate(struct cam_periph *periph)
334{
355 int s;
335 struct pt_softc *softc;
336 struct ccb_setasync csa;
337
338 softc = (struct pt_softc *)periph->softc;
339
340 /*
341 * De-register any async callbacks.
342 */
343 xpt_setup_ccb(&csa.ccb_h, periph->path,
344 /* priority */ 5);
345 csa.ccb_h.func_code = XPT_SASYNC_CB;
346 csa.event_enable = 0;
347 csa.callback = ptasync;
348 csa.callback_arg = periph;
349 xpt_action((union ccb *)&csa);
350
351 softc->flags |= PT_FLAG_DEVICE_INVALID;
352
353 /*
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 /*
354 * Return all queued I/O with ENXIO.
355 * XXX Handle any transactions queued to the card
356 * with XPT_ABORT_CCB.
357 */
358 bioq_flush(&softc->bio_queue, NULL, ENXIO);
359
388 splx(s);
389
360 xpt_print(periph->path, "lost device\n");
361}
362
363static void
364ptdtor(struct cam_periph *periph)
365{
366 struct pt_softc *softc;
367

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410 "due to status 0x%x\n", status);
411 break;
412 }
413 case AC_SENT_BDR:
414 case AC_BUS_RESET:
415 {
416 struct pt_softc *softc;
417 struct ccb_hdr *ccbh;
448 int s;
418
419 softc = (struct pt_softc *)periph->softc;
451 s = splsoftcam();
420 /*
421 * Don't fail on the expected unit attention
422 * that will occur.
423 */
424 softc->flags |= PT_FLAG_RETRY_UA;
425 LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
426 ccbh->ccb_state |= PT_CCB_RETRY_UA;
459 splx(s);
427 }
428 /* FALLTHROUGH */
429 default:
430 cam_periph_async(periph, code, path, arg);
431 break;
432 }
433}
434
435static void
436ptstart(struct cam_periph *periph, union ccb *start_ccb)
437{
438 struct pt_softc *softc;
439 struct bio *bp;
473 int s;
440
441 softc = (struct pt_softc *)periph->softc;
442
443 /*
444 * See if there is a buf with work for us to do..
445 */
480 s = splbio();
446 bp = bioq_first(&softc->bio_queue);
447 if (periph->immediate_priority <= periph->pinfo.priority) {
448 CAM_DEBUG_PRINT(CAM_DEBUG_SUBTRACE,
449 ("queuing for immediate ccb\n"));
450 start_ccb->ccb_h.ccb_state = PT_CCB_WAITING;
451 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
452 periph_links.sle);
453 periph->immediate_priority = CAM_PRIORITY_NONE;
489 splx(s);
454 wakeup(&periph->ccb_list);
455 } else if (bp == NULL) {
492 splx(s);
456 xpt_release_ccb(start_ccb);
457 } else {
495 int oldspl;
496
458 bioq_remove(&softc->bio_queue, bp);
459
460 devstat_start_transaction_bio(softc->device_stats, bp);
461
462 scsi_send_receive(&start_ccb->csio,
463 /*retries*/4,
464 ptdone,
465 MSG_SIMPLE_Q_TAG,

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471 /*timeout*/softc->io_timeout);
472
473 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
474
475 /*
476 * Block out any asyncronous callbacks
477 * while we touch the pending ccb list.
478 */
518 oldspl = splcam();
479 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
480 periph_links.le);
521 splx(oldspl);
481
482 start_ccb->ccb_h.ccb_bp = bp;
483 bp = bioq_first(&softc->bio_queue);
525 splx(s);
484
485 xpt_action(start_ccb);
486
487 if (bp != NULL) {
488 /* Have more work to do, so ensure we stay scheduled */
489 xpt_schedule(periph, /* XXX priority */1);
490 }
491 }

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499
500 softc = (struct pt_softc *)periph->softc;
501 csio = &done_ccb->csio;
502 switch (csio->ccb_h.ccb_state) {
503 case PT_CCB_BUFFER_IO:
504 case PT_CCB_BUFFER_IO_UA:
505 {
506 struct bio *bp;
549 int oldspl;
507
508 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
509 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
510 int error;
554 int s;
511 int sf;
512
513 if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
514 sf = SF_RETRY_UA;
515 else
516 sf = 0;
517
518 error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
519 if (error == ERESTART) {
520 /*
521 * A retry was scheuled, so
522 * just return.
523 */
524 return;
525 }
526 if (error != 0) {
571 s = splbio();
572
527 if (error == ENXIO) {
528 /*
529 * Catastrophic error. Mark our device
530 * as invalid.
531 */
532 xpt_print(periph->path,
533 "Invalidating device\n");
534 softc->flags |= PT_FLAG_DEVICE_INVALID;
535 }
536
537 /*
538 * return all queued I/O with EIO, so that
539 * the client can retry these I/Os in the
540 * proper order should it attempt to recover.
541 */
542 bioq_flush(&softc->bio_queue, NULL, EIO);
589 splx(s);
543 bp->bio_error = error;
544 bp->bio_resid = bp->bio_bcount;
545 bp->bio_flags |= BIO_ERROR;
546 } else {
547 bp->bio_resid = csio->resid;
548 bp->bio_error = 0;
549 if (bp->bio_resid != 0) {
550 /* Short transfer ??? */

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562 if (bp->bio_resid != 0)
563 bp->bio_flags |= BIO_ERROR;
564 }
565
566 /*
567 * Block out any asyncronous callbacks
568 * while we touch the pending ccb list.
569 */
617 oldspl = splcam();
570 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
619 splx(oldspl);
571
572 biofinish(bp, softc->device_stats, 0);
573 break;
574 }
575 case PT_CCB_WAITING:
576 /* Caller will release the CCB */
577 wakeup(&done_ccb->ccb_h.cbfcnp);
578 return;

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593 &softc->saved_ccb));
594}
595
596static int
597ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
598{
599 struct cam_periph *periph;
600 struct pt_softc *softc;
650 int error;
601 int error = 0;
602
603 periph = (struct cam_periph *)dev->si_drv1;
604 if (periph == NULL)
605 return(ENXIO);
606
607 softc = (struct pt_softc *)periph->softc;
608
658 if ((error = cam_periph_lock(periph, PRIBIO|PCATCH)) != 0) {
659 return (error); /* error code from tsleep */
660 }
609 cam_periph_lock(periph);
610
611 switch(cmd) {
612 case PTIOCGETTIMEOUT:
613 if (softc->io_timeout >= 1000)
614 *(int *)addr = softc->io_timeout / 1000;
615 else
616 *(int *)addr = 0;
617 break;
618 case PTIOCSETTIMEOUT:
670 {
671 int s;
672
619 if (*(int *)addr < 1) {
620 error = EINVAL;
621 break;
622 }
623
678 s = splsoftcam();
624 softc->io_timeout = *(int *)addr * 1000;
680 splx(s);
625
626 break;
683 }
627 default:
628 error = cam_periph_ioctl(periph, cmd, addr, pterror);
629 break;
630 }
631
632 cam_periph_unlock(periph);
633
634 return(error);

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