xref: /freebsd/sys/cam/scsi/scsi_pt.c (revision f7c32ed617858bcd22f8d1b03199099d50125721) 
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 	int	 io_timeout;
86 	struct cdev *dev;
87 };
88 
89 static	d_open_t	ptopen;
90 static	d_close_t	ptclose;
91 static	d_strategy_t	ptstrategy;
92 static	periph_init_t	ptinit;
93 static	void		ptasync(void *callback_arg, u_int32_t code,
94 				struct cam_path *path, void *arg);
95 static	periph_ctor_t	ptctor;
96 static	periph_oninv_t	ptoninvalidate;
97 static	periph_dtor_t	ptdtor;
98 static	periph_start_t	ptstart;
99 static	void		ptdone(struct cam_periph *periph,
100 			       union ccb *done_ccb);
101 static	d_ioctl_t	ptioctl;
102 static  int		pterror(union ccb *ccb, u_int32_t cam_flags,
103 				u_int32_t sense_flags);
104 
105 void	scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
106 			  void (*cbfcnp)(struct cam_periph *, union ccb *),
107 			  u_int tag_action, int readop, u_int byte2,
108 			  u_int32_t xfer_len, u_int8_t *data_ptr,
109 			  u_int8_t sense_len, u_int32_t timeout);
110 
111 static struct periph_driver ptdriver =
112 {
113 	ptinit, "pt",
114 	TAILQ_HEAD_INITIALIZER(ptdriver.units), /* generation */ 0
115 };
116 
117 PERIPHDRIVER_DECLARE(pt, ptdriver);
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) != 0)
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 	softc = (struct pt_softc *)periph->softc;
177 
178 	cam_periph_lock(periph);
179 
180 	softc->flags &= ~PT_FLAG_OPEN;
181 	cam_periph_release_locked(periph);
182 	cam_periph_unlock(periph);
183 	return (0);
184 }
185 
186 /*
187  * Actually translate the requested transfer into one the physical driver
188  * can understand.  The transfer is described by a buf and will include
189  * only one physical transfer.
190  */
191 static void
192 ptstrategy(struct bio *bp)
193 {
194 	struct cam_periph *periph;
195 	struct pt_softc *softc;
196 
197 	periph = (struct cam_periph *)bp->bio_dev->si_drv1;
198 	bp->bio_resid = bp->bio_bcount;
199 	if (periph == NULL) {
200 		biofinish(bp, NULL, ENXIO);
201 		return;
202 	}
203 	cam_periph_lock(periph);
204 	softc = (struct pt_softc *)periph->softc;
205 
206 	/*
207 	 * If the device has been made invalid, error out
208 	 */
209 	if ((softc->flags & PT_FLAG_DEVICE_INVALID)) {
210 		cam_periph_unlock(periph);
211 		biofinish(bp, NULL, ENXIO);
212 		return;
213 	}
214 
215 	/*
216 	 * Place it in the queue of disk activities for this disk
217 	 */
218 	bioq_insert_tail(&softc->bio_queue, bp);
219 
220 	/*
221 	 * Schedule ourselves for performing the work.
222 	 */
223 	xpt_schedule(periph, CAM_PRIORITY_NORMAL);
224 	cam_periph_unlock(periph);
225 
226 	return;
227 }
228 
229 static void
230 ptinit(void)
231 {
232 	cam_status status;
233 
234 	/*
235 	 * Install a global async callback.  This callback will
236 	 * receive async callbacks like "new device found".
237 	 */
238 	status = xpt_register_async(AC_FOUND_DEVICE, ptasync, NULL, NULL);
239 
240 	if (status != CAM_REQ_CMP) {
241 		printf("pt: Failed to attach master async callback "
242 		       "due to status 0x%x!\n", status);
243 	}
244 }
245 
246 static cam_status
247 ptctor(struct cam_periph *periph, void *arg)
248 {
249 	struct pt_softc *softc;
250 	struct ccb_getdev *cgd;
251 	struct ccb_pathinq cpi;
252 	struct make_dev_args args;
253 	int error;
254 
255 	cgd = (struct ccb_getdev *)arg;
256 	if (cgd == NULL) {
257 		printf("ptregister: no getdev CCB, can't register device\n");
258 		return(CAM_REQ_CMP_ERR);
259 	}
260 
261 	softc = (struct pt_softc *)malloc(sizeof(*softc),M_DEVBUF,M_NOWAIT);
262 
263 	if (softc == NULL) {
264 		printf("daregister: Unable to probe new device. "
265 		       "Unable to allocate softc\n");
266 		return(CAM_REQ_CMP_ERR);
267 	}
268 
269 	bzero(softc, sizeof(*softc));
270 	LIST_INIT(&softc->pending_ccbs);
271 	softc->state = PT_STATE_NORMAL;
272 	bioq_init(&softc->bio_queue);
273 
274 	softc->io_timeout = SCSI_PT_DEFAULT_TIMEOUT * 1000;
275 
276 	periph->softc = softc;
277 
278 	xpt_path_inq(&cpi, periph->path);
279 
280 	cam_periph_unlock(periph);
281 
282 	make_dev_args_init(&args);
283 	args.mda_devsw = &pt_cdevsw;
284 	args.mda_unit = periph->unit_number;
285 	args.mda_uid = UID_ROOT;
286 	args.mda_gid = GID_OPERATOR;
287 	args.mda_mode = 0600;
288 	args.mda_si_drv1 = periph;
289 	error = make_dev_s(&args, &softc->dev, "%s%d", periph->periph_name,
290 	    periph->unit_number);
291 	if (error != 0) {
292 		cam_periph_lock(periph);
293 		return (CAM_REQ_CMP_ERR);
294 	}
295 
296 	softc->device_stats = devstat_new_entry("pt",
297 			  periph->unit_number, 0,
298 			  DEVSTAT_NO_BLOCKSIZE,
299 			  SID_TYPE(&cgd->inq_data) |
300 			  XPORT_DEVSTAT_TYPE(cpi.transport),
301 			  DEVSTAT_PRIORITY_OTHER);
302 
303 	cam_periph_lock(periph);
304 
305 	/*
306 	 * Add async callbacks for bus reset and
307 	 * bus device reset calls.  I don't bother
308 	 * checking if this fails as, in most cases,
309 	 * the system will function just fine without
310 	 * them and the only alternative would be to
311 	 * not attach the device on failure.
312 	 */
313 	xpt_register_async(AC_SENT_BDR | AC_BUS_RESET | AC_LOST_DEVICE,
314 			   ptasync, periph, periph->path);
315 
316 	/* Tell the user we've attached to the device */
317 	xpt_announce_periph(periph, NULL);
318 
319 	return(CAM_REQ_CMP);
320 }
321 
322 static void
323 ptoninvalidate(struct cam_periph *periph)
324 {
325 	struct pt_softc *softc;
326 
327 	softc = (struct pt_softc *)periph->softc;
328 
329 	/*
330 	 * De-register any async callbacks.
331 	 */
332 	xpt_register_async(0, ptasync, periph, periph->path);
333 
334 	softc->flags |= PT_FLAG_DEVICE_INVALID;
335 
336 	/*
337 	 * Return all queued I/O with ENXIO.
338 	 * XXX Handle any transactions queued to the card
339 	 *     with XPT_ABORT_CCB.
340 	 */
341 	bioq_flush(&softc->bio_queue, NULL, ENXIO);
342 }
343 
344 static void
345 ptdtor(struct cam_periph *periph)
346 {
347 	struct pt_softc *softc;
348 
349 	softc = (struct pt_softc *)periph->softc;
350 
351 	devstat_remove_entry(softc->device_stats);
352 	cam_periph_unlock(periph);
353 	destroy_dev(softc->dev);
354 	cam_periph_lock(periph);
355 	free(softc, M_DEVBUF);
356 }
357 
358 static void
359 ptasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg)
360 {
361 	struct cam_periph *periph;
362 
363 	periph = (struct cam_periph *)callback_arg;
364 	switch (code) {
365 	case AC_FOUND_DEVICE:
366 	{
367 		struct ccb_getdev *cgd;
368 		cam_status status;
369 
370 		cgd = (struct ccb_getdev *)arg;
371 		if (cgd == NULL)
372 			break;
373 
374 		if (cgd->protocol != PROTO_SCSI)
375 			break;
376 		if (SID_QUAL(&cgd->inq_data) != SID_QUAL_LU_CONNECTED)
377 			break;
378 		if (SID_TYPE(&cgd->inq_data) != T_PROCESSOR)
379 			break;
380 
381 		/*
382 		 * Allocate a peripheral instance for
383 		 * this device and start the probe
384 		 * process.
385 		 */
386 		status = cam_periph_alloc(ptctor, ptoninvalidate, ptdtor,
387 					  ptstart, "pt", CAM_PERIPH_BIO,
388 					  path, ptasync,
389 					  AC_FOUND_DEVICE, cgd);
390 
391 		if (status != CAM_REQ_CMP
392 		 && status != CAM_REQ_INPROG)
393 			printf("ptasync: Unable to attach to new device "
394 				"due to status 0x%x\n", status);
395 		break;
396 	}
397 	case AC_SENT_BDR:
398 	case AC_BUS_RESET:
399 	{
400 		struct pt_softc *softc;
401 		struct ccb_hdr *ccbh;
402 
403 		softc = (struct pt_softc *)periph->softc;
404 		/*
405 		 * Don't fail on the expected unit attention
406 		 * that will occur.
407 		 */
408 		softc->flags |= PT_FLAG_RETRY_UA;
409 		LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
410 			ccbh->ccb_state |= PT_CCB_RETRY_UA;
411 	}
412 	/* FALLTHROUGH */
413 	default:
414 		cam_periph_async(periph, code, path, arg);
415 		break;
416 	}
417 }
418 
419 static void
420 ptstart(struct cam_periph *periph, union ccb *start_ccb)
421 {
422 	struct pt_softc *softc;
423 	struct bio *bp;
424 
425 	softc = (struct pt_softc *)periph->softc;
426 
427 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptstart\n"));
428 
429 	/*
430 	 * See if there is a buf with work for us to do..
431 	 */
432 	bp = bioq_first(&softc->bio_queue);
433 	if (bp == NULL) {
434 		xpt_release_ccb(start_ccb);
435 	} else {
436 		bioq_remove(&softc->bio_queue, bp);
437 
438 		devstat_start_transaction_bio(softc->device_stats, bp);
439 
440 		scsi_send_receive(&start_ccb->csio,
441 				  /*retries*/4,
442 				  ptdone,
443 				  MSG_SIMPLE_Q_TAG,
444 				  bp->bio_cmd == BIO_READ,
445 				  /*byte2*/0,
446 				  bp->bio_bcount,
447 				  bp->bio_data,
448 				  /*sense_len*/SSD_FULL_SIZE,
449 				  /*timeout*/softc->io_timeout);
450 
451 		start_ccb->ccb_h.ccb_state = PT_CCB_BUFFER_IO_UA;
452 
453 		/*
454 		 * Block out any asynchronous callbacks
455 		 * while we touch the pending ccb list.
456 		 */
457 		LIST_INSERT_HEAD(&softc->pending_ccbs, &start_ccb->ccb_h,
458 				 periph_links.le);
459 
460 		start_ccb->ccb_h.ccb_bp = bp;
461 		bp = bioq_first(&softc->bio_queue);
462 
463 		xpt_action(start_ccb);
464 
465 		if (bp != NULL) {
466 			/* Have more work to do, so ensure we stay scheduled */
467 			xpt_schedule(periph, CAM_PRIORITY_NORMAL);
468 		}
469 	}
470 }
471 
472 static void
473 ptdone(struct cam_periph *periph, union ccb *done_ccb)
474 {
475 	struct pt_softc *softc;
476 	struct ccb_scsiio *csio;
477 
478 	softc = (struct pt_softc *)periph->softc;
479 
480 	CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("ptdone\n"));
481 
482 	csio = &done_ccb->csio;
483 	switch (csio->ccb_h.ccb_state) {
484 	case PT_CCB_BUFFER_IO:
485 	case PT_CCB_BUFFER_IO_UA:
486 	{
487 		struct bio *bp;
488 
489 		bp = (struct bio *)done_ccb->ccb_h.ccb_bp;
490 		if ((done_ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
491 			int error;
492 			int sf;
493 
494 			if ((csio->ccb_h.ccb_state & PT_CCB_RETRY_UA) != 0)
495 				sf = SF_RETRY_UA;
496 			else
497 				sf = 0;
498 
499 			error = pterror(done_ccb, CAM_RETRY_SELTO, sf);
500 			if (error == ERESTART) {
501 				/*
502 				 * A retry was scheuled, so
503 				 * just return.
504 				 */
505 				return;
506 			}
507 			if (error != 0) {
508 				if (error == ENXIO) {
509 					/*
510 					 * Catastrophic error.  Mark our device
511 					 * as invalid.
512 					 */
513 					xpt_print(periph->path,
514 					    "Invalidating device\n");
515 					softc->flags |= PT_FLAG_DEVICE_INVALID;
516 				}
517 
518 				/*
519 				 * return all queued I/O with EIO, so that
520 				 * the client can retry these I/Os in the
521 				 * proper order should it attempt to recover.
522 				 */
523 				bioq_flush(&softc->bio_queue, NULL, EIO);
524 				bp->bio_error = error;
525 				bp->bio_resid = bp->bio_bcount;
526 				bp->bio_flags |= BIO_ERROR;
527 			} else {
528 				bp->bio_resid = csio->resid;
529 				bp->bio_error = 0;
530 				if (bp->bio_resid != 0) {
531 					/* Short transfer ??? */
532 					bp->bio_flags |= BIO_ERROR;
533 				}
534 			}
535 			if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0)
536 				cam_release_devq(done_ccb->ccb_h.path,
537 						 /*relsim_flags*/0,
538 						 /*reduction*/0,
539 						 /*timeout*/0,
540 						 /*getcount_only*/0);
541 		} else {
542 			bp->bio_resid = csio->resid;
543 			if (bp->bio_resid != 0)
544 				bp->bio_flags |= BIO_ERROR;
545 		}
546 
547 		/*
548 		 * Block out any asynchronous callbacks
549 		 * while we touch the pending ccb list.
550 		 */
551 		LIST_REMOVE(&done_ccb->ccb_h, periph_links.le);
552 
553 		biofinish(bp, softc->device_stats, 0);
554 		break;
555 	}
556 	}
557 	xpt_release_ccb(done_ccb);
558 }
559 
560 static int
561 pterror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
562 {
563 	struct pt_softc	  *softc;
564 	struct cam_periph *periph;
565 
566 	periph = xpt_path_periph(ccb->ccb_h.path);
567 	softc = (struct pt_softc *)periph->softc;
568 
569 	return(cam_periph_error(ccb, cam_flags, sense_flags));
570 }
571 
572 static int
573 ptioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
574 {
575 	struct cam_periph *periph;
576 	struct pt_softc *softc;
577 	int error = 0;
578 
579 	periph = (struct cam_periph *)dev->si_drv1;
580 	softc = (struct pt_softc *)periph->softc;
581 
582 	cam_periph_lock(periph);
583 
584 	switch(cmd) {
585 	case PTIOCGETTIMEOUT:
586 		if (softc->io_timeout >= 1000)
587 			*(int *)addr = softc->io_timeout / 1000;
588 		else
589 			*(int *)addr = 0;
590 		break;
591 	case PTIOCSETTIMEOUT:
592 		if (*(int *)addr < 1) {
593 			error = EINVAL;
594 			break;
595 		}
596 
597 		softc->io_timeout = *(int *)addr * 1000;
598 
599 		break;
600 	default:
601 		error = cam_periph_ioctl(periph, cmd, addr, pterror);
602 		break;
603 	}
604 
605 	cam_periph_unlock(periph);
606 
607 	return(error);
608 }
609 
610 void
611 scsi_send_receive(struct ccb_scsiio *csio, u_int32_t retries,
612 		  void (*cbfcnp)(struct cam_periph *, union ccb *),
613 		  u_int tag_action, int readop, u_int byte2,
614 		  u_int32_t xfer_len, u_int8_t *data_ptr, u_int8_t sense_len,
615 		  u_int32_t timeout)
616 {
617 	struct scsi_send_receive *scsi_cmd;
618 
619 	scsi_cmd = (struct scsi_send_receive *)&csio->cdb_io.cdb_bytes;
620 	scsi_cmd->opcode = readop ? RECEIVE : SEND;
621 	scsi_cmd->byte2 = byte2;
622 	scsi_ulto3b(xfer_len, scsi_cmd->xfer_len);
623 	scsi_cmd->control = 0;
624 
625 	cam_fill_csio(csio,
626 		      retries,
627 		      cbfcnp,
628 		      /*flags*/readop ? CAM_DIR_IN : CAM_DIR_OUT,
629 		      tag_action,
630 		      data_ptr,
631 		      xfer_len,
632 		      sense_len,
633 		      sizeof(*scsi_cmd),
634 		      timeout);
635 }
636