xref: /freebsd/sys/cam/scsi/scsi_pt.c (revision 77a1348b3c1cfe8547be49a121b56299a1e18b69) 
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Implementation of SCSI Processor Target Peripheral driver for CAM.
5  *
6  * Copyright (c) 1998 Justin T. Gibbs.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions, and the following disclaimer,
14  *    without modification, immediately at the beginning of the file.
15  * 2. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
29  */
30 
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33 
34 #include <sys/param.h>
35 #include <sys/queue.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/types.h>
39 #include <sys/bio.h>
40 #include <sys/devicestat.h>
41 #include <sys/malloc.h>
42 #include <sys/conf.h>
43 #include <sys/ptio.h>
44 
45 #include <cam/cam.h>
46 #include <cam/cam_ccb.h>
47 #include <cam/cam_periph.h>
48 #include <cam/cam_xpt_periph.h>
49 #include <cam/cam_debug.h>
50 
51 #include <cam/scsi/scsi_all.h>
52 #include <cam/scsi/scsi_message.h>
53 #include <cam/scsi/scsi_pt.h>
54 
55 #include "opt_pt.h"
56 
57 typedef enum {
58 	PT_STATE_PROBE,
59 	PT_STATE_NORMAL
60 } pt_state;
61 
62 typedef enum {
63 	PT_FLAG_NONE		= 0x00,
64 	PT_FLAG_OPEN		= 0x01,
65 	PT_FLAG_DEVICE_INVALID	= 0x02,
66 	PT_FLAG_RETRY_UA	= 0x04
67 } pt_flags;
68 
69 typedef enum {
70 	PT_CCB_BUFFER_IO	= 0x01,
71 	PT_CCB_RETRY_UA		= 0x04,
72 	PT_CCB_BUFFER_IO_UA	= PT_CCB_BUFFER_IO|PT_CCB_RETRY_UA
73 } pt_ccb_state;
74 
75 /* Offsets into our private area for storing information */
76 #define ccb_state	ppriv_field0
77 #define ccb_bp		ppriv_ptr1
78 
79 struct pt_softc {
80 	struct	 bio_queue_head bio_queue;
81 	struct	 devstat *device_stats;
82 	LIST_HEAD(, ccb_hdr) pending_ccbs;
83 	pt_state state;
84 	pt_flags flags;
85 	union	 ccb saved_ccb;
86 	int	 io_timeout;
87 	struct cdev *dev;
88 };
89 
90 static	d_open_t	ptopen;
91 static	d_close_t	ptclose;
92 static	d_strategy_t	ptstrategy;
93 static	periph_init_t	ptinit;
94 static	void		ptasync(void *callback_arg, u_int32_t code,
95 				struct cam_path *path, void *arg);
96 static	periph_ctor_t	ptctor;
97 static	periph_oninv_t	ptoninvalidate;
98 static	periph_dtor_t	ptdtor;
99 static	periph_start_t	ptstart;
100 static	void		ptdone(struct cam_periph *periph,
101 			       union ccb *done_ccb);
102 static	d_ioctl_t	ptioctl;
103 static  int		pterror(union ccb *ccb, u_int32_t cam_flags,
104 				u_int32_t sense_flags);
105 
106 void	scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
107 			  void (*cbfcnp)(struct cam_periph *, union ccb *),
108 			  u_int tag_action, int readop, u_int byte2,
109 			  u_int32_t xfer_len, u_int8_t *data_ptr,
110 			  u_int8_t sense_len, u_int32_t timeout);
111 
112 static struct periph_driver ptdriver =
113 {
114 	ptinit, "pt",
115 	TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
116 };
117 
118 PERIPHDRIVER_DECLARE(pt, ptdriver);
119 
120 
121 static struct cdevsw pt_cdevsw = {
122 	.d_version =	D_VERSION,
123 	.d_flags =	0,
124 	.d_open =	ptopen,
125 	.d_close =	ptclose,
126 	.d_read =	physread,
127 	.d_write =	physwrite,
128 	.d_ioctl =	ptioctl,
129 	.d_strategy =	ptstrategy,
130 	.d_name =	"pt",
131 };
132 
133 #ifndef SCSI_PT_DEFAULT_TIMEOUT
134 #define SCSI_PT_DEFAULT_TIMEOUT		60
135 #endif
136 
137 static int
138 ptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
139 {
140 	struct cam_periph *periph;
141 	struct pt_softc *softc;
142 	int error = 0;
143 
144 	periph = (struct cam_periph *)dev->si_drv1;
145 	if (cam_periph_acquire(periph) != 0)
146 		return (ENXIO);
147 
148 	softc = (struct pt_softc *)periph->softc;
149 
150 	cam_periph_lock(periph);
151 	if (softc->flags & PT_FLAG_DEVICE_INVALID) {
152 		cam_periph_release_locked(periph);
153 		cam_periph_unlock(periph);
154 		return(ENXIO);
155 	}
156 
157 	if ((softc->flags & PT_FLAG_OPEN) == 0)
158 		softc->flags |= PT_FLAG_OPEN;
159 	else {
160 		error = EBUSY;
161 		cam_periph_release(periph);
162 	}
163 
164 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
165 	    ("ptopen: dev=%s\n", devtoname(dev)));
166 
167 	cam_periph_unlock(periph);
168 	return (error);
169 }
170 
171 static int
172 ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
173 {
174 	struct	cam_periph *periph;
175 	struct	pt_softc *softc;
176 
177 	periph = (struct cam_periph *)dev->si_drv1;
178 	softc = (struct pt_softc *)periph->softc;
179 
180 	cam_periph_lock(periph);
181 
182 	softc->flags &= ~PT_FLAG_OPEN;
183 	cam_periph_release_locked(periph);
184 	cam_periph_unlock(periph);
185 	return (0);
186 }
187 
188 /*
189  * Actually translate the requested transfer into one the physical driver
190  * can understand.  The transfer is described by a buf and will include
191  * only one physical transfer.
192  */
193 static void
194 ptstrategy(struct bio *bp)
195 {
196 	struct cam_periph *periph;
197 	struct pt_softc *softc;
198 
199 	periph = (struct cam_periph *)bp->bio_dev->si_drv1;
200 	bp->bio_resid = bp->bio_bcount;
201 	if (periph == NULL) {
202 		biofinish(bp, NULL, ENXIO);
203 		return;
204 	}
205 	cam_periph_lock(periph);
206 	softc = (struct pt_softc *)periph->softc;
207 
208 	/*
209 	 * If the device has been made invalid, error out
210 	 */
211 	if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
212 		cam_periph_unlock(periph);
213 		biofinish(bp, NULL, ENXIO);
214 		return;
215 	}
216 
217 	/*
218 	 * Place it in the queue of disk activities for this disk
219 	 */
220 	bioq_insert_tail(&softc->bio_queue, bp);
221 
222 	/*
223 	 * Schedule ourselves for performing the work.
224 	 */
225 	xpt_schedule(periph, CAM_PRIORITY_NORMAL);
226 	cam_periph_unlock(periph);
227 
228 	return;
229 }
230 
231 static void
232 ptinit(void)
233 {
234 	cam_status status;
235 
236 	/*
237 	 * Install a global async callback.  This callback will
238 	 * receive async callbacks like "new device found".
239 	 */
240 	status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
241 
242 	if (status != CAM_REQ_CMP) {
243 		printf("pt: Failed to attach master async callback "
244 		       "due to status 0x%x!\n", status);
245 	}
246 }
247 
248 static cam_status
249 ptctor(struct cam_periph *periph, void *arg)
250 {
251 	struct pt_softc *softc;
252 	struct ccb_getdev *cgd;
253 	struct ccb_pathinq cpi;
254 	struct make_dev_args args;
255 	int error;
256 
257 	cgd = (struct ccb_getdev *)arg;
258 	if (cgd == NULL) {
259 		printf("ptregister: no getdev CCB, can't register device\n");
260 		return(CAM_REQ_CMP_ERR);
261 	}
262 
263 	softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);
264 
265 	if (softc == NULL) {
266 		printf("daregister: Unable to probe new device. "
267 		       "Unable to allocate softc\n");
268 		return(CAM_REQ_CMP_ERR);
269 	}
270 
271 	bzero(softc, sizeof(*softc));
272 	LIST_INIT(&softc->pending_ccbs);
273 	softc->state = PT_STATE_NORMAL;
274 	bioq_init(&softc->bio_queue);
275 
276 	softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
277 
278 	periph->softc = softc;
279 
280 	xpt_path_inq(&cpi, periph->path);
281 
282 	cam_periph_unlock(periph);
283 
284 	make_dev_args_init(&args);
285 	args.mda_devsw = &pt_cdevsw;
286 	args.mda_unit = periph->unit_number;
287 	args.mda_uid = UID_ROOT;
288 	args.mda_gid = GID_OPERATOR;
289 	args.mda_mode = 0600;
290 	args.mda_si_drv1 = periph;
291 	error = make_dev_s(&args, &softc->dev, "%s%d", periph->periph_name,
292 	    periph->unit_number);
293 	if (error != 0) {
294 		cam_periph_lock(periph);
295 		return (CAM_REQ_CMP_ERR);
296 	}
297 
298 	softc->device_stats = devstat_new_entry("pt",
299 			  periph->unit_number, 0,
300 			  DEVSTAT_NO_BLOCKSIZE,
301 			  SID_TYPE(&cgd->inq_data) |
302 			  XPORT_DEVSTAT_TYPE(cpi.transport),
303 			  DEVSTAT_PRIORITY_OTHER);
304 
305 	cam_periph_lock(periph);
306 
307 	/*
308 	 * Add async callbacks for bus reset and
309 	 * bus device reset calls.  I don't bother
310 	 * checking if this fails as, in most cases,
311 	 * the system will function just fine without
312 	 * them and the only alternative would be to
313 	 * not attach the device on failure.
314 	 */
315 	xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
316 			   ptasync, periph, periph->path);
317 
318 	/* Tell the user we've attached to the device */
319 	xpt_announce_periph(periph, NULL);
320 
321 	return(CAM_REQ_CMP);
322 }
323 
324 static void
325 ptoninvalidate(struct cam_periph *periph)
326 {
327 	struct pt_softc *softc;
328 
329 	softc = (struct pt_softc *)periph->softc;
330 
331 	/*
332 	 * De-register any async callbacks.
333 	 */
334 	xpt_register_async(0, ptasync, periph, periph->path);
335 
336 	softc->flags |= PT_FLAG_DEVICE_INVALID;
337 
338 	/*
339 	 * Return all queued I/O with ENXIO.
340 	 * XXX Handle any transactions queued to the card
341 	 *     with XPT_ABORT_CCB.
342 	 */
343 	bioq_flush(&softc->bio_queue, NULL, ENXIO);
344 }
345 
346 static void
347 ptdtor(struct cam_periph *periph)
348 {
349 	struct pt_softc *softc;
350 
351 	softc = (struct pt_softc *)periph->softc;
352 
353 	devstat_remove_entry(softc->device_stats);
354 	cam_periph_unlock(periph);
355 	destroy_dev(softc->dev);
356 	cam_periph_lock(periph);
357 	free(softc, M_DEVBUF);
358 }
359 
360 static void
361 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
362 {
363 	struct cam_periph *periph;
364 
365 	periph = (struct cam_periph *)callback_arg;
366 	switch (code) {
367 	case AC_FOUND_DEVICE:
368 	{
369 		struct ccb_getdev *cgd;
370 		cam_status status;
371 
372 		cgd = (struct ccb_getdev *)arg;
373 		if (cgd == NULL)
374 			break;
375 
376 		if (cgd->protocol != PROTO_SCSI)
377 			break;
378 		if (SID_QUAL(&cgd->inq_data) != SID_QUAL_LU_CONNECTED)
379 			break;
380 		if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
381 			break;
382 
383 		/*
384 		 * Allocate a peripheral instance for
385 		 * this device and start the probe
386 		 * process.
387 		 */
388 		status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
389 					  ptstart, "pt", CAM_PERIPH_BIO,
390 					  path, ptasync,
391 					  AC_FOUND_DEVICE, cgd);
392 
393 		if (status != CAM_REQ_CMP
394 		 && status != CAM_REQ_INPROG)
395 			printf("ptasync: Unable to attach to new device "
396 				"due to status 0x%x\n", status);
397 		break;
398 	}
399 	case AC_SENT_BDR:
400 	case AC_BUS_RESET:
401 	{
402 		struct pt_softc *softc;
403 		struct ccb_hdr *ccbh;
404 
405 		softc = (struct pt_softc *)periph->softc;
406 		/*
407 		 * Don't fail on the expected unit attention
408 		 * that will occur.
409 		 */
410 		softc->flags |= PT_FLAG_RETRY_UA;
411 		LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
412 			ccbh->ccb_state |= PT_CCB_RETRY_UA;
413 	}
414 	/* FALLTHROUGH */
415 	default:
416 		cam_periph_async(periph, code, path, arg);
417 		break;
418 	}
419 }
420 
421 static void
422 ptstart(struct cam_periph *periph, union ccb *start_ccb)
423 {
424 	struct pt_softc *softc;
425 	struct bio *bp;
426 
427 	softc = (struct pt_softc *)periph->softc;
428 
429 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptstart\n"));
430 
431 	/*
432 	 * See if there is a buf with work for us to do..
433 	 */
434 	bp = bioq_first(&softc->bio_queue);
435 	if (bp == NULL) {
436 		xpt_release_ccb(start_ccb);
437 	} else {
438 		bioq_remove(&softc->bio_queue, bp);
439 
440 		devstat_start_transaction_bio(softc->device_stats, bp);
441 
442 		scsi_send_receive(&start_ccb->csio,
443 				  /*retries*/4,
444 				  ptdone,
445 				  MSG_SIMPLE_Q_TAG,
446 				  bp->bio_cmd == BIO_READ,
447 				  /*byte2*/0,
448 				  bp->bio_bcount,
449 				  bp->bio_data,
450 				  /*sense_len*/SSD_FULL_SIZE,
451 				  /*timeout*/softc->io_timeout);
452 
453 		start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
454 
455 		/*
456 		 * Block out any asynchronous callbacks
457 		 * while we touch the pending ccb list.
458 		 */
459 		LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
460 				 periph_links.le);
461 
462 		start_ccb->ccb_h.ccb_bp = bp;
463 		bp = bioq_first(&softc->bio_queue);
464 
465 		xpt_action(start_ccb);
466 
467 		if (bp != NULL) {
468 			/* Have more work to do, so ensure we stay scheduled */
469 			xpt_schedule(periph, CAM_PRIORITY_NORMAL);
470 		}
471 	}
472 }
473 
474 static void
475 ptdone(struct cam_periph *periph, union ccb *done_ccb)
476 {
477 	struct pt_softc *softc;
478 	struct ccb_scsiio *csio;
479 
480 	softc = (struct pt_softc *)periph->softc;
481 
482 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptdone\n"));
483 
484 	csio = &done_ccb->csio;
485 	switch (csio->ccb_h.ccb_state) {
486 	case PT_CCB_BUFFER_IO:
487 	case PT_CCB_BUFFER_IO_UA:
488 	{
489 		struct bio *bp;
490 
491 		bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
492 		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
493 			int error;
494 			int sf;
495 
496 			if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
497 				sf = SF_RETRY_UA;
498 			else
499 				sf = 0;
500 
501 			error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
502 			if (error == ERESTART) {
503 				/*
504 				 * A retry was scheuled, so
505 				 * just return.
506 				 */
507 				return;
508 			}
509 			if (error != 0) {
510 				if (error == ENXIO) {
511 					/*
512 					 * Catastrophic error.  Mark our device
513 					 * as invalid.
514 					 */
515 					xpt_print(periph->path,
516 					    "Invalidating device\n");
517 					softc->flags |= PT_FLAG_DEVICE_INVALID;
518 				}
519 
520 				/*
521 				 * return all queued I/O with EIO, so that
522 				 * the client can retry these I/Os in the
523 				 * proper order should it attempt to recover.
524 				 */
525 				bioq_flush(&softc->bio_queue, NULL, EIO);
526 				bp->bio_error = error;
527 				bp->bio_resid = bp->bio_bcount;
528 				bp->bio_flags |= BIO_ERROR;
529 			} else {
530 				bp->bio_resid = csio->resid;
531 				bp->bio_error = 0;
532 				if (bp->bio_resid != 0) {
533 					/* Short transfer ??? */
534 					bp->bio_flags |= BIO_ERROR;
535 				}
536 			}
537 			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
538 				cam_release_devq(done_ccb->ccb_h.path,
539 						 /*relsim_flags*/0,
540 						 /*reduction*/0,
541 						 /*timeout*/0,
542 						 /*getcount_only*/0);
543 		} else {
544 			bp->bio_resid = csio->resid;
545 			if (bp->bio_resid != 0)
546 				bp->bio_flags |= BIO_ERROR;
547 		}
548 
549 		/*
550 		 * Block out any asynchronous callbacks
551 		 * while we touch the pending ccb list.
552 		 */
553 		LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
554 
555 		biofinish(bp, softc->device_stats, 0);
556 		break;
557 	}
558 	}
559 	xpt_release_ccb(done_ccb);
560 }
561 
562 static int
563 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
564 {
565 	struct pt_softc	  *softc;
566 	struct cam_periph *periph;
567 
568 	periph = xpt_path_periph(ccb->ccb_h.path);
569 	softc = (struct pt_softc *)periph->softc;
570 
571 	return(cam_periph_error(ccb, cam_flags, sense_flags));
572 }
573 
574 static int
575 ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
576 {
577 	struct cam_periph *periph;
578 	struct pt_softc *softc;
579 	int error = 0;
580 
581 	periph = (struct cam_periph *)dev->si_drv1;
582 	softc = (struct pt_softc *)periph->softc;
583 
584 	cam_periph_lock(periph);
585 
586 	switch(cmd) {
587 	case PTIOCGETTIMEOUT:
588 		if (softc->io_timeout >= 1000)
589 			*(int *)addr = softc->io_timeout / 1000;
590 		else
591 			*(int *)addr = 0;
592 		break;
593 	case PTIOCSETTIMEOUT:
594 		if (*(int *)addr < 1) {
595 			error = EINVAL;
596 			break;
597 		}
598 
599 		softc->io_timeout = *(int *)addr * 1000;
600 
601 		break;
602 	default:
603 		error = cam_periph_ioctl(periph, cmd, addr, pterror);
604 		break;
605 	}
606 
607 	cam_periph_unlock(periph);
608 
609 	return(error);
610 }
611 
612 void
613 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
614 		  void (*cbfcnp)(struct cam_periph *, union ccb *),
615 		  u_int tag_action, int readop, u_int byte2,
616 		  u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
617 		  u_int32_t timeout)
618 {
619 	struct scsi_send_receive *scsi_cmd;
620 
621 	scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
622 	scsi_cmd->opcode = readop ? RECEIVE : SEND;
623 	scsi_cmd->byte2 = byte2;
624 	scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
625 	scsi_cmd->control = 0;
626 
627 	cam_fill_csio(csio,
628 		      retries,
629 		      cbfcnp,
630 		      /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
631 		      tag_action,
632 		      data_ptr,
633 		      xfer_len,
634 		      sense_len,
635 		      sizeof(*scsi_cmd),
636 		      timeout);
637 }
638