xref: /freebsd/sys/cam/scsi/scsi_pt.c (revision 7cc42f6d) 
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 static struct cdevsw pt_cdevsw = {
121 	.d_version =	D_VERSION,
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 
136 static int
137 ptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
138 {
139 	struct cam_periph *periph;
140 	struct pt_softc *softc;
141 	int error = 0;
142 
143 	periph = (struct cam_periph *)dev->si_drv1;
144 	if (cam_periph_acquire(periph) != 0)
145 		return (ENXIO);
146 
147 	softc = (struct pt_softc *)periph->softc;
148 
149 	cam_periph_lock(periph);
150 	if (softc->flags & PT_FLAG_DEVICE_INVALID) {
151 		cam_periph_release_locked(periph);
152 		cam_periph_unlock(periph);
153 		return(ENXIO);
154 	}
155 
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 
163 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE,
164 	    ("ptopen: dev=%s\n", devtoname(dev)));
165 
166 	cam_periph_unlock(periph);
167 	return (error);
168 }
169 
170 static int
171 ptclose(struct cdev *dev, int flag, int fmt, struct thread *td)
172 {
173 	struct	cam_periph *periph;
174 	struct	pt_softc *softc;
175 
176 	periph = (struct cam_periph *)dev->si_drv1;
177 	softc = (struct pt_softc *)periph->softc;
178 
179 	cam_periph_lock(periph);
180 
181 	softc->flags &= ~PT_FLAG_OPEN;
182 	cam_periph_release_locked(periph);
183 	cam_periph_unlock(periph);
184 	return (0);
185 }
186 
187 /*
188  * Actually translate the requested transfer into one the physical driver
189  * can understand.  The transfer is described by a buf and will include
190  * only one physical transfer.
191  */
192 static void
193 ptstrategy(struct bio *bp)
194 {
195 	struct cam_periph *periph;
196 	struct pt_softc *softc;
197 
198 	periph = (struct cam_periph *)bp->bio_dev->si_drv1;
199 	bp->bio_resid = bp->bio_bcount;
200 	if (periph == NULL) {
201 		biofinish(bp, NULL, ENXIO);
202 		return;
203 	}
204 	cam_periph_lock(periph);
205 	softc = (struct pt_softc *)periph->softc;
206 
207 	/*
208 	 * If the device has been made invalid, error out
209 	 */
210 	if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
211 		cam_periph_unlock(periph);
212 		biofinish(bp, NULL, ENXIO);
213 		return;
214 	}
215 
216 	/*
217 	 * Place it in the queue of disk activities for this disk
218 	 */
219 	bioq_insert_tail(&softc->bio_queue, bp);
220 
221 	/*
222 	 * Schedule ourselves for performing the work.
223 	 */
224 	xpt_schedule(periph, CAM_PRIORITY_NORMAL);
225 	cam_periph_unlock(periph);
226 
227 	return;
228 }
229 
230 static void
231 ptinit(void)
232 {
233 	cam_status status;
234 
235 	/*
236 	 * Install a global async callback.  This callback will
237 	 * receive async callbacks like "new device found".
238 	 */
239 	status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
240 
241 	if (status != CAM_REQ_CMP) {
242 		printf("pt: Failed to attach master async callback "
243 		       "due to status 0x%x!\n", status);
244 	}
245 }
246 
247 static cam_status
248 ptctor(struct cam_periph *periph, void *arg)
249 {
250 	struct pt_softc *softc;
251 	struct ccb_getdev *cgd;
252 	struct ccb_pathinq cpi;
253 	struct make_dev_args args;
254 	int error;
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 	xpt_path_inq(&cpi, periph->path);
280 
281 	cam_periph_unlock(periph);
282 
283 	make_dev_args_init(&args);
284 	args.mda_devsw = &pt_cdevsw;
285 	args.mda_unit = periph->unit_number;
286 	args.mda_uid = UID_ROOT;
287 	args.mda_gid = GID_OPERATOR;
288 	args.mda_mode = 0600;
289 	args.mda_si_drv1 = periph;
290 	error = make_dev_s(&args, &softc->dev, "%s%d", periph->periph_name,
291 	    periph->unit_number);
292 	if (error != 0) {
293 		cam_periph_lock(periph);
294 		return (CAM_REQ_CMP_ERR);
295 	}
296 
297 	softc->device_stats = devstat_new_entry("pt",
298 			  periph->unit_number, 0,
299 			  DEVSTAT_NO_BLOCKSIZE,
300 			  SID_TYPE(&cgd->inq_data) |
301 			  XPORT_DEVSTAT_TYPE(cpi.transport),
302 			  DEVSTAT_PRIORITY_OTHER);
303 
304 	cam_periph_lock(periph);
305 
306 	/*
307 	 * Add async callbacks for bus reset and
308 	 * bus device reset calls.  I don't bother
309 	 * checking if this fails as, in most cases,
310 	 * the system will function just fine without
311 	 * them and the only alternative would be to
312 	 * not attach the device on failure.
313 	 */
314 	xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
315 			   ptasync, periph, periph->path);
316 
317 	/* Tell the user we've attached to the device */
318 	xpt_announce_periph(periph, NULL);
319 
320 	return(CAM_REQ_CMP);
321 }
322 
323 static void
324 ptoninvalidate(struct cam_periph *periph)
325 {
326 	struct pt_softc *softc;
327 
328 	softc = (struct pt_softc *)periph->softc;
329 
330 	/*
331 	 * De-register any async callbacks.
332 	 */
333 	xpt_register_async(0, ptasync, periph, periph->path);
334 
335 	softc->flags |= PT_FLAG_DEVICE_INVALID;
336 
337 	/*
338 	 * Return all queued I/O with ENXIO.
339 	 * XXX Handle any transactions queued to the card
340 	 *     with XPT_ABORT_CCB.
341 	 */
342 	bioq_flush(&softc->bio_queue, NULL, ENXIO);
343 }
344 
345 static void
346 ptdtor(struct cam_periph *periph)
347 {
348 	struct pt_softc *softc;
349 
350 	softc = (struct pt_softc *)periph->softc;
351 
352 	devstat_remove_entry(softc->device_stats);
353 	cam_periph_unlock(periph);
354 	destroy_dev(softc->dev);
355 	cam_periph_lock(periph);
356 	free(softc, M_DEVBUF);
357 }
358 
359 static void
360 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
361 {
362 	struct cam_periph *periph;
363 
364 	periph = (struct cam_periph *)callback_arg;
365 	switch (code) {
366 	case AC_FOUND_DEVICE:
367 	{
368 		struct ccb_getdev *cgd;
369 		cam_status status;
370 
371 		cgd = (struct ccb_getdev *)arg;
372 		if (cgd == NULL)
373 			break;
374 
375 		if (cgd->protocol != PROTO_SCSI)
376 			break;
377 		if (SID_QUAL(&cgd->inq_data) != SID_QUAL_LU_CONNECTED)
378 			break;
379 		if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
380 			break;
381 
382 		/*
383 		 * Allocate a peripheral instance for
384 		 * this device and start the probe
385 		 * process.
386 		 */
387 		status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
388 					  ptstart, "pt", CAM_PERIPH_BIO,
389 					  path, ptasync,
390 					  AC_FOUND_DEVICE, cgd);
391 
392 		if (status != CAM_REQ_CMP
393 		 && status != CAM_REQ_INPROG)
394 			printf("ptasync: Unable to attach to new device "
395 				"due to status 0x%x\n", status);
396 		break;
397 	}
398 	case AC_SENT_BDR:
399 	case AC_BUS_RESET:
400 	{
401 		struct pt_softc *softc;
402 		struct ccb_hdr *ccbh;
403 
404 		softc = (struct pt_softc *)periph->softc;
405 		/*
406 		 * Don't fail on the expected unit attention
407 		 * that will occur.
408 		 */
409 		softc->flags |= PT_FLAG_RETRY_UA;
410 		LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
411 			ccbh->ccb_state |= PT_CCB_RETRY_UA;
412 	}
413 	/* FALLTHROUGH */
414 	default:
415 		cam_periph_async(periph, code, path, arg);
416 		break;
417 	}
418 }
419 
420 static void
421 ptstart(struct cam_periph *periph, union ccb *start_ccb)
422 {
423 	struct pt_softc *softc;
424 	struct bio *bp;
425 
426 	softc = (struct pt_softc *)periph->softc;
427 
428 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptstart\n"));
429 
430 	/*
431 	 * See if there is a buf with work for us to do..
432 	 */
433 	bp = bioq_first(&softc->bio_queue);
434 	if (bp == NULL) {
435 		xpt_release_ccb(start_ccb);
436 	} else {
437 		bioq_remove(&softc->bio_queue, bp);
438 
439 		devstat_start_transaction_bio(softc->device_stats, bp);
440 
441 		scsi_send_receive(&start_ccb->csio,
442 				  /*retries*/4,
443 				  ptdone,
444 				  MSG_SIMPLE_Q_TAG,
445 				  bp->bio_cmd == BIO_READ,
446 				  /*byte2*/0,
447 				  bp->bio_bcount,
448 				  bp->bio_data,
449 				  /*sense_len*/SSD_FULL_SIZE,
450 				  /*timeout*/softc->io_timeout);
451 
452 		start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
453 
454 		/*
455 		 * Block out any asynchronous callbacks
456 		 * while we touch the pending ccb list.
457 		 */
458 		LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
459 				 periph_links.le);
460 
461 		start_ccb->ccb_h.ccb_bp = bp;
462 		bp = bioq_first(&softc->bio_queue);
463 
464 		xpt_action(start_ccb);
465 
466 		if (bp != NULL) {
467 			/* Have more work to do, so ensure we stay scheduled */
468 			xpt_schedule(periph, CAM_PRIORITY_NORMAL);
469 		}
470 	}
471 }
472 
473 static void
474 ptdone(struct cam_periph *periph, union ccb *done_ccb)
475 {
476 	struct pt_softc *softc;
477 	struct ccb_scsiio *csio;
478 
479 	softc = (struct pt_softc *)periph->softc;
480 
481 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptdone\n"));
482 
483 	csio = &done_ccb->csio;
484 	switch (csio->ccb_h.ccb_state) {
485 	case PT_CCB_BUFFER_IO:
486 	case PT_CCB_BUFFER_IO_UA:
487 	{
488 		struct bio *bp;
489 
490 		bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
491 		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
492 			int error;
493 			int sf;
494 
495 			if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
496 				sf = SF_RETRY_UA;
497 			else
498 				sf = 0;
499 
500 			error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
501 			if (error == ERESTART) {
502 				/*
503 				 * A retry was scheuled, so
504 				 * just return.
505 				 */
506 				return;
507 			}
508 			if (error != 0) {
509 				if (error == ENXIO) {
510 					/*
511 					 * Catastrophic error.  Mark our device
512 					 * as invalid.
513 					 */
514 					xpt_print(periph->path,
515 					    "Invalidating device\n");
516 					softc->flags |= PT_FLAG_DEVICE_INVALID;
517 				}
518 
519 				/*
520 				 * return all queued I/O with EIO, so that
521 				 * the client can retry these I/Os in the
522 				 * proper order should it attempt to recover.
523 				 */
524 				bioq_flush(&softc->bio_queue, NULL, EIO);
525 				bp->bio_error = error;
526 				bp->bio_resid = bp->bio_bcount;
527 				bp->bio_flags |= BIO_ERROR;
528 			} else {
529 				bp->bio_resid = csio->resid;
530 				bp->bio_error = 0;
531 				if (bp->bio_resid != 0) {
532 					/* Short transfer ??? */
533 					bp->bio_flags |= BIO_ERROR;
534 				}
535 			}
536 			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
537 				cam_release_devq(done_ccb->ccb_h.path,
538 						 /*relsim_flags*/0,
539 						 /*reduction*/0,
540 						 /*timeout*/0,
541 						 /*getcount_only*/0);
542 		} else {
543 			bp->bio_resid = csio->resid;
544 			if (bp->bio_resid != 0)
545 				bp->bio_flags |= BIO_ERROR;
546 		}
547 
548 		/*
549 		 * Block out any asynchronous callbacks
550 		 * while we touch the pending ccb list.
551 		 */
552 		LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
553 
554 		biofinish(bp, softc->device_stats, 0);
555 		break;
556 	}
557 	}
558 	xpt_release_ccb(done_ccb);
559 }
560 
561 static int
562 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
563 {
564 	struct pt_softc	  *softc;
565 	struct cam_periph *periph;
566 
567 	periph = xpt_path_periph(ccb->ccb_h.path);
568 	softc = (struct pt_softc *)periph->softc;
569 
570 	return(cam_periph_error(ccb, cam_flags, sense_flags));
571 }
572 
573 static int
574 ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
575 {
576 	struct cam_periph *periph;
577 	struct pt_softc *softc;
578 	int error = 0;
579 
580 	periph = (struct cam_periph *)dev->si_drv1;
581 	softc = (struct pt_softc *)periph->softc;
582 
583 	cam_periph_lock(periph);
584 
585 	switch(cmd) {
586 	case PTIOCGETTIMEOUT:
587 		if (softc->io_timeout >= 1000)
588 			*(int *)addr = softc->io_timeout / 1000;
589 		else
590 			*(int *)addr = 0;
591 		break;
592 	case PTIOCSETTIMEOUT:
593 		if (*(int *)addr < 1) {
594 			error = EINVAL;
595 			break;
596 		}
597 
598 		softc->io_timeout = *(int *)addr * 1000;
599 
600 		break;
601 	default:
602 		error = cam_periph_ioctl(periph, cmd, addr, pterror);
603 		break;
604 	}
605 
606 	cam_periph_unlock(periph);
607 
608 	return(error);
609 }
610 
611 void
612 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
613 		  void (*cbfcnp)(struct cam_periph *, union ccb *),
614 		  u_int tag_action, int readop, u_int byte2,
615 		  u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
616 		  u_int32_t timeout)
617 {
618 	struct scsi_send_receive *scsi_cmd;
619 
620 	scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
621 	scsi_cmd->opcode = readop ? RECEIVE : SEND;
622 	scsi_cmd->byte2 = byte2;
623 	scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
624 	scsi_cmd->control = 0;
625 
626 	cam_fill_csio(csio,
627 		      retries,
628 		      cbfcnp,
629 		      /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
630 		      tag_action,
631 		      data_ptr,
632 		      xfer_len,
633 		      sense_len,
634 		      sizeof(*scsi_cmd),
635 		      timeout);
636 }
637