FreeBSD/Linux Kernel Cross Reference
sys/cam/scsi/scsi_pt.c
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
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification, immediately at the beginning of the file.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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: releng/10.1/sys/cam/scsi/scsi_pt.c 260387 2014-01-07 01:51:48Z 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>
39 #include <sys/malloc.h>
40 #include <sys/conf.h>
41 #include <sys/ptio.h>
42
43 #include <cam/cam.h>
44 #include <cam/cam_ccb.h>
45 #include <cam/cam_periph.h>
46 #include <cam/cam_xpt_periph.h>
47 #include <cam/cam_debug.h>
48
49 #include <cam/scsi/scsi_all.h>
50 #include <cam/scsi/scsi_message.h>
51 #include <cam/scsi/scsi_pt.h>
52
53 #include "opt_pt.h"
54
55 typedef enum {
56 PT_STATE_PROBE,
57 PT_STATE_NORMAL
58 } pt_state;
59
60 typedef enum {
61 PT_FLAG_NONE = 0x00,
62 PT_FLAG_OPEN = 0x01,
63 PT_FLAG_DEVICE_INVALID = 0x02,
64 PT_FLAG_RETRY_UA = 0x04
65 } pt_flags;
66
67 typedef enum {
68 PT_CCB_BUFFER_IO = 0x01,
69 PT_CCB_RETRY_UA = 0x04,
70 PT_CCB_BUFFER_IO_UA = PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
71 } pt_ccb_state;
72
73 /* Offsets into our private area for storing information */
74 #define ccb_state ppriv_field0
75 #define ccb_bp ppriv_ptr1
76
77 struct pt_softc {
78 struct bio_queue_head bio_queue;
79 struct devstat *device_stats;
80 LIST_HEAD(, ccb_hdr) pending_ccbs;
81 pt_state state;
82 pt_flags flags;
83 union ccb saved_ccb;
84 int io_timeout;
85 struct cdev *dev;
86 };
87
88 static d_open_t ptopen;
89 static d_close_t ptclose;
90 static d_strategy_t ptstrategy;
91 static periph_init_t ptinit;
92 static void ptasync(void *callback_arg, u_int32_t code,
93 struct cam_path *path, void *arg);
94 static periph_ctor_t ptctor;
95 static periph_oninv_t ptoninvalidate;
96 static periph_dtor_t ptdtor;
97 static periph_start_t ptstart;
98 static void ptdone(struct cam_periph *periph,
99 union ccb *done_ccb);
100 static d_ioctl_t ptioctl;
101 static int pterror(union ccb *ccb, u_int32_t cam_flags,
102 u_int32_t sense_flags);
103
104 void scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
105 void (*cbfcnp)(struct cam_periph *, union ccb *),
106 u_int tag_action, int readop, u_int byte2,
107 u_int32_t xfer_len, u_int8_t *data_ptr,
108 u_int8_t sense_len, u_int32_t timeout);
109
110 static struct periph_driver ptdriver =
111 {
112 ptinit, "pt",
113 TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
114 };
115
116 PERIPHDRIVER_DECLARE(pt, ptdriver);
117
118
119 static struct cdevsw pt_cdevsw = {
120 .d_version = D_VERSION,
121 .d_flags = 0,
122 .d_open = ptopen,
123 .d_close = ptclose,
124 .d_read = physread,
125 .d_write = physwrite,
126 .d_ioctl = ptioctl,
127 .d_strategy = ptstrategy,
128 .d_name = "pt",
129 };
130
131 #ifndef SCSI_PT_DEFAULT_TIMEOUT
132 #define SCSI_PT_DEFAULT_TIMEOUT 60
133 #endif
134
135 static int
136 ptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
137 {
138 struct cam_periph *periph;
139 struct pt_softc *softc;
140 int error = 0;
141
142 periph = (struct cam_periph *)dev->si_drv1;
143 if (cam_periph_acquire(periph) != CAM_REQ_CMP)
144 return (ENXIO);
145
146 softc = (struct pt_softc *)periph->softc;
147
148 cam_periph_lock(periph);
149 if (softc->flags & PT_FLAG_DEVICE_INVALID) {
150 cam_periph_release_locked(periph);
151 cam_periph_unlock(periph);
152 return(ENXIO);
153 }
154
155 if ((softc->flags & PT_FLAG_OPEN) == 0)
156 softc->flags |= PT_FLAG_OPEN;
157 else {
158 error = EBUSY;
159 cam_periph_release(periph);
160 }
161
162 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
163 ("ptopen: dev=%s\n", devtoname(dev)));
164
165 cam_periph_unlock(periph);
166 return (error);
167 }
168
169 static int
170 ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
171 {
172 struct cam_periph *periph;
173 struct pt_softc *softc;
174
175 periph = (struct cam_periph *)dev->si_drv1;
176 if (periph == NULL)
177 return (ENXIO);
178
179 softc = (struct pt_softc *)periph->softc;
180
181 cam_periph_lock(periph);
182
183 softc->flags &= ~PT_FLAG_OPEN;
184 cam_periph_release_locked(periph);
185 cam_periph_unlock(periph);
186 return (0);
187 }
188
189 /*
190 * Actually translate the requested transfer into one the physical driver
191 * can understand. The transfer is described by a buf and will include
192 * only one physical transfer.
193 */
194 static void
195 ptstrategy(struct bio *bp)
196 {
197 struct cam_periph *periph;
198 struct pt_softc *softc;
199
200 periph = (struct cam_periph *)bp->bio_dev->si_drv1;
201 bp->bio_resid = bp->bio_bcount;
202 if (periph == NULL) {
203 biofinish(bp, NULL, ENXIO);
204 return;
205 }
206 cam_periph_lock(periph);
207 softc = (struct pt_softc *)periph->softc;
208
209 /*
210 * If the device has been made invalid, error out
211 */
212 if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
213 cam_periph_unlock(periph);
214 biofinish(bp, NULL, ENXIO);
215 return;
216 }
217
218 /*
219 * Place it in the queue of disk activities for this disk
220 */
221 bioq_insert_tail(&softc->bio_queue, bp);
222
223 /*
224 * Schedule ourselves for performing the work.
225 */
226 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
227 cam_periph_unlock(periph);
228
229 return;
230 }
231
232 static void
233 ptinit(void)
234 {
235 cam_status status;
236
237 /*
238 * Install a global async callback. This callback will
239 * receive async callbacks like "new device found".
240 */
241 status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
242
243 if (status != CAM_REQ_CMP) {
244 printf("pt: Failed to attach master async callback "
245 "due to status 0x%x!\n", status);
246 }
247 }
248
249 static cam_status
250 ptctor(struct cam_periph *periph, void *arg)
251 {
252 struct pt_softc *softc;
253 struct ccb_getdev *cgd;
254 struct ccb_pathinq cpi;
255
256 cgd = (struct ccb_getdev *)arg;
257 if (cgd == NULL) {
258 printf("ptregister: no getdev CCB, can't register device\n");
259 return(CAM_REQ_CMP_ERR);
260 }
261
262 softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);
263
264 if (softc == NULL) {
265 printf("daregister: Unable to probe new device. "
266 "Unable to allocate softc\n");
267 return(CAM_REQ_CMP_ERR);
268 }
269
270 bzero(softc, sizeof(*softc));
271 LIST_INIT(&softc->pending_ccbs);
272 softc->state = PT_STATE_NORMAL;
273 bioq_init(&softc->bio_queue);
274
275 softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
276
277 periph->softc = softc;
278
279 bzero(&cpi, sizeof(cpi));
280 xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
281 cpi.ccb_h.func_code = XPT_PATH_INQ;
282 xpt_action((union ccb *)&cpi);
283
284 cam_periph_unlock(periph);
285 softc->device_stats = devstat_new_entry("pt",
286 periph->unit_number, 0,
287 DEVSTAT_NO_BLOCKSIZE,
288 SID_TYPE(&cgd->inq_data) |
289 XPORT_DEVSTAT_TYPE(cpi.transport),
290 DEVSTAT_PRIORITY_OTHER);
291
292 softc->dev = make_dev(&pt_cdevsw, periph->unit_number, UID_ROOT,
293 GID_OPERATOR, 0600, "%s%d", periph->periph_name,
294 periph->unit_number);
295 cam_periph_lock(periph);
296 softc->dev->si_drv1 = periph;
297
298 /*
299 * Add async callbacks for bus reset and
300 * bus device reset calls. I don't bother
301 * checking if this fails as, in most cases,
302 * the system will function just fine without
303 * them and the only alternative would be to
304 * not attach the device on failure.
305 */
306 xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
307 ptasync, periph, periph->path);
308
309 /* Tell the user we've attached to the device */
310 xpt_announce_periph(periph, NULL);
311
312 return(CAM_REQ_CMP);
313 }
314
315 static void
316 ptoninvalidate(struct cam_periph *periph)
317 {
318 struct pt_softc *softc;
319
320 softc = (struct pt_softc *)periph->softc;
321
322 /*
323 * De-register any async callbacks.
324 */
325 xpt_register_async(0, ptasync, periph, periph->path);
326
327 softc->flags |= PT_FLAG_DEVICE_INVALID;
328
329 /*
330 * Return all queued I/O with ENXIO.
331 * XXX Handle any transactions queued to the card
332 * with XPT_ABORT_CCB.
333 */
334 bioq_flush(&softc->bio_queue, NULL, ENXIO);
335 }
336
337 static void
338 ptdtor(struct cam_periph *periph)
339 {
340 struct pt_softc *softc;
341
342 softc = (struct pt_softc *)periph->softc;
343
344 devstat_remove_entry(softc->device_stats);
345 cam_periph_unlock(periph);
346 destroy_dev(softc->dev);
347 cam_periph_lock(periph);
348 free(softc, M_DEVBUF);
349 }
350
351 static void
352 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
353 {
354 struct cam_periph *periph;
355
356 periph = (struct cam_periph *)callback_arg;
357 switch (code) {
358 case AC_FOUND_DEVICE:
359 {
360 struct ccb_getdev *cgd;
361 cam_status status;
362
363 cgd = (struct ccb_getdev *)arg;
364 if (cgd == NULL)
365 break;
366
367 if (cgd->protocol != PROTO_SCSI)
368 break;
369
370 if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
371 break;
372
373 /*
374 * Allocate a peripheral instance for
375 * this device and start the probe
376 * process.
377 */
378 status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
379 ptstart, "pt", CAM_PERIPH_BIO,
380 path, ptasync,
381 AC_FOUND_DEVICE, cgd);
382
383 if (status != CAM_REQ_CMP
384 && status != CAM_REQ_INPROG)
385 printf("ptasync: Unable to attach to new device "
386 "due to status 0x%x\n", status);
387 break;
388 }
389 case AC_SENT_BDR:
390 case AC_BUS_RESET:
391 {
392 struct pt_softc *softc;
393 struct ccb_hdr *ccbh;
394
395 softc = (struct pt_softc *)periph->softc;
396 /*
397 * Don't fail on the expected unit attention
398 * that will occur.
399 */
400 softc->flags |= PT_FLAG_RETRY_UA;
401 LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
402 ccbh->ccb_state |= PT_CCB_RETRY_UA;
403 }
404 /* FALLTHROUGH */
405 default:
406 cam_periph_async(periph, code, path, arg);
407 break;
408 }
409 }
410
411 static void
412 ptstart(struct cam_periph *periph, union ccb *start_ccb)
413 {
414 struct pt_softc *softc;
415 struct bio *bp;
416
417 softc = (struct pt_softc *)periph->softc;
418
419 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptstart\n"));
420
421 /*
422 * See if there is a buf with work for us to do..
423 */
424 bp = bioq_first(&softc->bio_queue);
425 if (bp == NULL) {
426 xpt_release_ccb(start_ccb);
427 } else {
428 bioq_remove(&softc->bio_queue, bp);
429
430 devstat_start_transaction_bio(softc->device_stats, bp);
431
432 scsi_send_receive(&start_ccb->csio,
433 /*retries*/4,
434 ptdone,
435 MSG_SIMPLE_Q_TAG,
436 bp->bio_cmd == BIO_READ,
437 /*byte2*/0,
438 bp->bio_bcount,
439 bp->bio_data,
440 /*sense_len*/SSD_FULL_SIZE,
441 /*timeout*/softc->io_timeout);
442
443 start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
444
445 /*
446 * Block out any asynchronous callbacks
447 * while we touch the pending ccb list.
448 */
449 LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
450 periph_links.le);
451
452 start_ccb->ccb_h.ccb_bp = bp;
453 bp = bioq_first(&softc->bio_queue);
454
455 xpt_action(start_ccb);
456
457 if (bp != NULL) {
458 /* Have more work to do, so ensure we stay scheduled */
459 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
460 }
461 }
462 }
463
464 static void
465 ptdone(struct cam_periph *periph, union ccb *done_ccb)
466 {
467 struct pt_softc *softc;
468 struct ccb_scsiio *csio;
469
470 softc = (struct pt_softc *)periph->softc;
471
472 CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptdone\n"));
473
474 csio = &done_ccb->csio;
475 switch (csio->ccb_h.ccb_state) {
476 case PT_CCB_BUFFER_IO:
477 case PT_CCB_BUFFER_IO_UA:
478 {
479 struct bio *bp;
480
481 bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
482 if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
483 int error;
484 int sf;
485
486 if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
487 sf = SF_RETRY_UA;
488 else
489 sf = 0;
490
491 error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
492 if (error == ERESTART) {
493 /*
494 * A retry was scheuled, so
495 * just return.
496 */
497 return;
498 }
499 if (error != 0) {
500 if (error == ENXIO) {
501 /*
502 * Catastrophic error. Mark our device
503 * as invalid.
504 */
505 xpt_print(periph->path,
506 "Invalidating device\n");
507 softc->flags |= PT_FLAG_DEVICE_INVALID;
508 }
509
510 /*
511 * return all queued I/O with EIO, so that
512 * the client can retry these I/Os in the
513 * proper order should it attempt to recover.
514 */
515 bioq_flush(&softc->bio_queue, NULL, EIO);
516 bp->bio_error = error;
517 bp->bio_resid = bp->bio_bcount;
518 bp->bio_flags |= BIO_ERROR;
519 } else {
520 bp->bio_resid = csio->resid;
521 bp->bio_error = 0;
522 if (bp->bio_resid != 0) {
523 /* Short transfer ??? */
524 bp->bio_flags |= BIO_ERROR;
525 }
526 }
527 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
528 cam_release_devq(done_ccb->ccb_h.path,
529 /*relsim_flags*/0,
530 /*reduction*/0,
531 /*timeout*/0,
532 /*getcount_only*/0);
533 } else {
534 bp->bio_resid = csio->resid;
535 if (bp->bio_resid != 0)
536 bp->bio_flags |= BIO_ERROR;
537 }
538
539 /*
540 * Block out any asynchronous callbacks
541 * while we touch the pending ccb list.
542 */
543 LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
544
545 biofinish(bp, softc->device_stats, 0);
546 break;
547 }
548 }
549 xpt_release_ccb(done_ccb);
550 }
551
552 static int
553 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
554 {
555 struct pt_softc *softc;
556 struct cam_periph *periph;
557
558 periph = xpt_path_periph(ccb->ccb_h.path);
559 softc = (struct pt_softc *)periph->softc;
560
561 return(cam_periph_error(ccb, cam_flags, sense_flags,
562 &softc->saved_ccb));
563 }
564
565 static int
566 ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
567 {
568 struct cam_periph *periph;
569 struct pt_softc *softc;
570 int error = 0;
571
572 periph = (struct cam_periph *)dev->si_drv1;
573 if (periph == NULL)
574 return(ENXIO);
575
576 softc = (struct pt_softc *)periph->softc;
577
578 cam_periph_lock(periph);
579
580 switch(cmd) {
581 case PTIOCGETTIMEOUT:
582 if (softc->io_timeout >= 1000)
583 *(int *)addr = softc->io_timeout / 1000;
584 else
585 *(int *)addr = 0;
586 break;
587 case PTIOCSETTIMEOUT:
588 if (*(int *)addr < 1) {
589 error = EINVAL;
590 break;
591 }
592
593 softc->io_timeout = *(int *)addr * 1000;
594
595 break;
596 default:
597 error = cam_periph_ioctl(periph, cmd, addr, pterror);
598 break;
599 }
600
601 cam_periph_unlock(periph);
602
603 return(error);
604 }
605
606 void
607 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
608 void (*cbfcnp)(struct cam_periph *, union ccb *),
609 u_int tag_action, int readop, u_int byte2,
610 u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
611 u_int32_t timeout)
612 {
613 struct scsi_send_receive *scsi_cmd;
614
615 scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
616 scsi_cmd->opcode = readop ? RECEIVE : SEND;
617 scsi_cmd->byte2 = byte2;
618 scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
619 scsi_cmd->control = 0;
620
621 cam_fill_csio(csio,
622 retries,
623 cbfcnp,
624 /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
625 tag_action,
626 data_ptr,
627 xfer_len,
628 sense_len,
629 sizeof(*scsi_cmd),
630 timeout);
631 }
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