xref: /dragonfly/sys/bus/cam/scsi/scsi_pass.c (revision 70705abf) 
1 /*
2  * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs.
3  * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions, and the following disclaimer,
11  *    without modification, immediately at the beginning of the file.
12  * 2. The name of the author may not be used to endorse or promote products
13  *    derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
19  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD: src/sys/cam/scsi/scsi_pass.c,v 1.19 2000/01/17 06:27:37 mjacob Exp $
28  * $DragonFly: src/sys/bus/cam/scsi/scsi_pass.c,v 1.23 2007/11/18 17:53:01 pavalos Exp $
29  */
30 
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/kernel.h>
34 #include <sys/types.h>
35 #include <sys/buf.h>
36 #include <sys/malloc.h>
37 #include <sys/fcntl.h>
38 #include <sys/stat.h>
39 #include <sys/conf.h>
40 #include <sys/errno.h>
41 #include <sys/devicestat.h>
42 #include <sys/buf2.h>
43 #include <sys/thread2.h>
44 
45 #include "../cam.h"
46 #include "../cam_ccb.h"
47 #include "../cam_extend.h"
48 #include "../cam_periph.h"
49 #include "../cam_queue.h"
50 #include "../cam_xpt_periph.h"
51 #include "../cam_debug.h"
52 
53 #include "scsi_all.h"
54 #include "scsi_message.h"
55 #include "scsi_da.h"
56 #include "scsi_pass.h"
57 
58 typedef enum {
59 	PASS_FLAG_OPEN			= 0x01,
60 	PASS_FLAG_LOCKED		= 0x02,
61 	PASS_FLAG_INVALID		= 0x04
62 } pass_flags;
63 
64 typedef enum {
65 	PASS_STATE_NORMAL
66 } pass_state;
67 
68 typedef enum {
69 	PASS_CCB_BUFFER_IO,
70 	PASS_CCB_WAITING
71 } pass_ccb_types;
72 
73 #define ccb_type	ppriv_field0
74 #define ccb_bio		ppriv_ptr1
75 
76 struct pass_softc {
77 	pass_state	state;
78 	pass_flags	flags;
79 	u_int8_t	pd_type;
80 	union ccb	saved_ccb;
81 	struct devstat	device_stats;
82 };
83 
84 #define PASS_CDEV_MAJOR 31
85 
86 static	d_open_t	passopen;
87 static	d_close_t	passclose;
88 static	d_ioctl_t	passioctl;
89 
90 static	periph_init_t	passinit;
91 static	periph_ctor_t	passregister;
92 static	periph_oninv_t	passoninvalidate;
93 static	periph_dtor_t	passcleanup;
94 static	periph_start_t	passstart;
95 static	void		passasync(void *callback_arg, u_int32_t code,
96 				  struct cam_path *path, void *arg);
97 static	void		passdone(struct cam_periph *periph,
98 				 union ccb *done_ccb);
99 static	int		passerror(union ccb *ccb, u_int32_t cam_flags,
100 				  u_int32_t sense_flags);
101 static 	int		passsendccb(struct cam_periph *periph, union ccb *ccb,
102 				    union ccb *inccb);
103 
104 static struct periph_driver passdriver =
105 {
106 	passinit, "pass",
107 	TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0
108 };
109 
110 PERIPHDRIVER_DECLARE(pass, passdriver);
111 
112 static struct dev_ops pass_ops = {
113 	{ "pass", PASS_CDEV_MAJOR, 0 },
114 	.d_open =	passopen,
115 	.d_close =	passclose,
116 	.d_read =	noread,
117 	.d_write =	nowrite,
118 	.d_ioctl =	passioctl,
119 	.d_strategy =	nostrategy,
120 };
121 
122 static struct extend_array *passperiphs;
123 
124 static void
125 passinit(void)
126 {
127 	cam_status status;
128 	struct cam_path *path;
129 
130 	/*
131 	 * Create our extend array for storing the devices we attach to.
132 	 */
133 	passperiphs = cam_extend_new();
134 	if (passperiphs == NULL) {
135 		kprintf("passm: Failed to alloc extend array!\n");
136 		return;
137 	}
138 
139 	/*
140 	 * Install a global async callback.  This callback will
141 	 * receive async callbacks like "new device found".
142 	 */
143 	status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
144 				 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
145 
146 	if (status == CAM_REQ_CMP) {
147 		struct ccb_setasync csa;
148 
149                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
150                 csa.ccb_h.func_code = XPT_SASYNC_CB;
151                 csa.event_enable = AC_FOUND_DEVICE;
152                 csa.callback = passasync;
153                 csa.callback_arg = NULL;
154                 xpt_action((union ccb *)&csa);
155 		status = csa.ccb_h.status;
156                 xpt_free_path(path);
157         }
158 
159 	if (status != CAM_REQ_CMP) {
160 		kprintf("pass: Failed to attach master async callback "
161 		       "due to status 0x%x!\n", status);
162 	}
163 
164 }
165 
166 static void
167 passoninvalidate(struct cam_periph *periph)
168 {
169 	struct pass_softc *softc;
170 	struct ccb_setasync csa;
171 
172 	softc = (struct pass_softc *)periph->softc;
173 
174 	/*
175 	 * De-register any async callbacks.
176 	 */
177 	xpt_setup_ccb(&csa.ccb_h, periph->path,
178 		      /* priority */ 5);
179 	csa.ccb_h.func_code = XPT_SASYNC_CB;
180 	csa.event_enable = 0;
181 	csa.callback = passasync;
182 	csa.callback_arg = periph;
183 	xpt_action((union ccb *)&csa);
184 
185 	softc->flags |= PASS_FLAG_INVALID;
186 
187 	if (bootverbose) {
188 		xpt_print_path(periph->path);
189 		kprintf("lost device\n");
190 	}
191 
192 }
193 
194 static void
195 passcleanup(struct cam_periph *periph)
196 {
197 	struct pass_softc *softc;
198 
199 	softc = (struct pass_softc *)periph->softc;
200 
201 	devstat_remove_entry(&softc->device_stats);
202 
203 	cam_extend_release(passperiphs, periph->unit_number);
204 
205 	if (bootverbose) {
206 		xpt_print_path(periph->path);
207 		kprintf("removing device entry\n");
208 	}
209 	dev_ops_remove(&pass_ops, -1, periph->unit_number);
210 	kfree(softc, M_DEVBUF);
211 }
212 
213 static void
214 passasync(void *callback_arg, u_int32_t code,
215 	  struct cam_path *path, void *arg)
216 {
217 	struct cam_periph *periph;
218 
219 	periph = (struct cam_periph *)callback_arg;
220 
221 	switch (code) {
222 	case AC_FOUND_DEVICE:
223 	{
224 		struct ccb_getdev *cgd;
225 		cam_status status;
226 
227 		cgd = (struct ccb_getdev *)arg;
228 
229 		/*
230 		 * Allocate a peripheral instance for
231 		 * this device and start the probe
232 		 * process.
233 		 */
234 		status = cam_periph_alloc(passregister, passoninvalidate,
235 					  passcleanup, passstart, "pass",
236 					  CAM_PERIPH_BIO, cgd->ccb_h.path,
237 					  passasync, AC_FOUND_DEVICE, cgd);
238 
239 		if (status != CAM_REQ_CMP
240 		 && status != CAM_REQ_INPROG) {
241 			const struct cam_status_entry *entry;
242 
243 			entry = cam_fetch_status_entry(status);
244 
245 			kprintf("passasync: Unable to attach new device "
246 				"due to status %#x: %s\n", status, entry ?
247 				entry->status_text : "Unknown");
248 		}
249 
250 		break;
251 	}
252 	default:
253 		cam_periph_async(periph, code, path, arg);
254 		break;
255 	}
256 }
257 
258 static cam_status
259 passregister(struct cam_periph *periph, void *arg)
260 {
261 	struct pass_softc *softc;
262 	struct ccb_setasync csa;
263 	struct ccb_getdev *cgd;
264 	int    no_tags;
265 
266 	cgd = (struct ccb_getdev *)arg;
267 	if (periph == NULL) {
268 		kprintf("passregister: periph was NULL!!\n");
269 		return(CAM_REQ_CMP_ERR);
270 	}
271 
272 	if (cgd == NULL) {
273 		kprintf("passregister: no getdev CCB, can't register device\n");
274 		return(CAM_REQ_CMP_ERR);
275 	}
276 
277 	softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
278 	softc->state = PASS_STATE_NORMAL;
279 	softc->pd_type = SID_TYPE(&cgd->inq_data);
280 
281 	periph->softc = softc;
282 	cam_extend_set(passperiphs, periph->unit_number, periph);
283 
284 	/*
285 	 * We pass in 0 for a blocksize, since we don't
286 	 * know what the blocksize of this device is, if
287 	 * it even has a blocksize.
288 	 */
289 	no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
290 	devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, 0,
291 			  DEVSTAT_NO_BLOCKSIZE
292 			  | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0),
293 			  softc->pd_type |
294 			  DEVSTAT_TYPE_IF_SCSI |
295 			  DEVSTAT_TYPE_PASS,
296 			  DEVSTAT_PRIORITY_PASS);
297 
298 	/* Register the device */
299 	dev_ops_add(&pass_ops, -1, periph->unit_number);
300 	make_dev(&pass_ops, periph->unit_number, UID_ROOT,
301 		  GID_OPERATOR, 0600, "%s%d", periph->periph_name,
302 		  periph->unit_number);
303 
304 	/*
305 	 * Add an async callback so that we get
306 	 * notified if this device goes away.
307 	 */
308 	xpt_setup_ccb(&csa.ccb_h, periph->path, /* priority */ 5);
309 	csa.ccb_h.func_code = XPT_SASYNC_CB;
310 	csa.event_enable = AC_LOST_DEVICE;
311 	csa.callback = passasync;
312 	csa.callback_arg = periph;
313 	xpt_action((union ccb *)&csa);
314 
315 	if (bootverbose)
316 		xpt_announce_periph(periph, NULL);
317 
318 	return(CAM_REQ_CMP);
319 }
320 
321 static int
322 passopen(struct dev_open_args *ap)
323 {
324 	cdev_t dev = ap->a_head.a_dev;
325 	struct cam_periph *periph;
326 	struct pass_softc *softc;
327 	int unit, error;
328 
329 	error = 0; /* default to no error */
330 
331 	/* unit = dkunit(dev); */
332 	/* XXX KDM fix this */
333 	unit = minor(dev) & 0xff;
334 
335 	periph = cam_extend_get(passperiphs, unit);
336 
337 	if (periph == NULL)
338 		return (ENXIO);
339 
340 	softc = (struct pass_softc *)periph->softc;
341 
342 	crit_enter();
343 	if (softc->flags & PASS_FLAG_INVALID) {
344 		crit_exit();
345 		return(ENXIO);
346 	}
347 
348 	/*
349 	 * Don't allow access when we're running at a high securelvel.
350 	 */
351 	if (securelevel > 1) {
352 		crit_exit();
353 		return(EPERM);
354 	}
355 
356 	/*
357 	 * Only allow read-write access.
358 	 */
359 	if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0)) {
360 		crit_exit();
361 		return(EPERM);
362 	}
363 
364 	/*
365 	 * We don't allow nonblocking access.
366 	 */
367 	if ((ap->a_oflags & O_NONBLOCK) != 0) {
368 		xpt_print_path(periph->path);
369 		kprintf("can't do nonblocking accesss\n");
370 		crit_exit();
371 		return(EINVAL);
372 	}
373 
374 	if ((error = cam_periph_lock(periph, PCATCH)) != 0) {
375 		crit_exit();
376 		return (error);
377 	}
378 
379 	crit_exit();
380 
381 	if ((softc->flags & PASS_FLAG_OPEN) == 0) {
382 		if (cam_periph_acquire(periph) != CAM_REQ_CMP)
383 			return(ENXIO);
384 		softc->flags |= PASS_FLAG_OPEN;
385 	}
386 
387 	cam_periph_unlock(periph);
388 
389 	return (error);
390 }
391 
392 static int
393 passclose(struct dev_close_args *ap)
394 {
395 	cdev_t dev = ap->a_head.a_dev;
396 	struct 	cam_periph *periph;
397 	struct	pass_softc *softc;
398 	int	unit, error;
399 
400 	/* unit = dkunit(dev); */
401 	/* XXX KDM fix this */
402 	unit = minor(dev) & 0xff;
403 
404 	periph = cam_extend_get(passperiphs, unit);
405 	if (periph == NULL)
406 		return (ENXIO);
407 
408 	softc = (struct pass_softc *)periph->softc;
409 
410 	if ((error = cam_periph_lock(periph, 0)) != 0)
411 		return (error);
412 
413 	softc->flags &= ~PASS_FLAG_OPEN;
414 
415 	cam_periph_unlock(periph);
416 	cam_periph_release(periph);
417 
418 	return (0);
419 }
420 
421 static void
422 passstart(struct cam_periph *periph, union ccb *start_ccb)
423 {
424 	struct pass_softc *softc;
425 
426 	softc = (struct pass_softc *)periph->softc;
427 
428 	switch (softc->state) {
429 	case PASS_STATE_NORMAL:
430 		crit_enter();
431 		start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING;
432 		SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
433 				  periph_links.sle);
434 		periph->immediate_priority = CAM_PRIORITY_NONE;
435 		crit_exit();
436 		wakeup(&periph->ccb_list);
437 		break;
438 	}
439 }
440 
441 static void
442 passdone(struct cam_periph *periph, union ccb *done_ccb)
443 {
444 	struct pass_softc *softc;
445 	struct ccb_scsiio *csio;
446 
447 	softc = (struct pass_softc *)periph->softc;
448 	csio = &done_ccb->csio;
449 	switch (csio->ccb_h.ccb_type) {
450 	case PASS_CCB_WAITING:
451 		/* Caller will release the CCB */
452 		wakeup(&done_ccb->ccb_h.cbfcnp);
453 		return;
454 	}
455 	xpt_release_ccb(done_ccb);
456 }
457 
458 static int
459 passioctl(struct dev_ioctl_args *ap)
460 {
461 	cdev_t dev = ap->a_head.a_dev;
462 	caddr_t addr = ap->a_data;
463 	struct 	cam_periph *periph;
464 	struct	pass_softc *softc;
465 	u_int8_t unit;
466 	int      error;
467 
468 
469 	/* unit = dkunit(dev); */
470 	/* XXX KDM fix this */
471 	unit = minor(dev) & 0xff;
472 
473 	periph = cam_extend_get(passperiphs, unit);
474 
475 	if (periph == NULL)
476 		return(ENXIO);
477 
478 	softc = (struct pass_softc *)periph->softc;
479 
480 	error = 0;
481 
482 	switch (ap->a_cmd) {
483 
484 	case CAMIOCOMMAND:
485 	{
486 		union ccb *inccb;
487 		union ccb *ccb;
488 		int ccb_malloced;
489 
490 		inccb = (union ccb *)addr;
491 
492 		/*
493 		 * Some CCB types, like scan bus and scan lun can only go
494 		 * through the transport layer device.
495 		 */
496 		if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) {
497 			xpt_print_path(periph->path);
498 			kprintf("CCB function code %#x is restricted to the "
499 			       "XPT device\n", inccb->ccb_h.func_code);
500 			error = ENODEV;
501 			break;
502 		}
503 
504 		/*
505 		 * Non-immediate CCBs need a CCB from the per-device pool
506 		 * of CCBs, which is scheduled by the transport layer.
507 		 * Immediate CCBs and user-supplied CCBs should just be
508 		 * malloced.
509 		 */
510 		if ((inccb->ccb_h.func_code & XPT_FC_QUEUED)
511 		 && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) {
512 			ccb = cam_periph_getccb(periph,
513 						inccb->ccb_h.pinfo.priority);
514 			ccb_malloced = 0;
515 		} else {
516 			ccb = xpt_alloc_ccb();
517 
518 			if (ccb != NULL)
519 				xpt_setup_ccb(&ccb->ccb_h, periph->path,
520 					      inccb->ccb_h.pinfo.priority);
521 			ccb_malloced = 1;
522 		}
523 
524 		if (ccb == NULL) {
525 			xpt_print_path(periph->path);
526 			kprintf("unable to allocate CCB\n");
527 			error = ENOMEM;
528 			break;
529 		}
530 
531 		error = passsendccb(periph, ccb, inccb);
532 
533 		if (ccb_malloced)
534 			xpt_free_ccb(ccb);
535 		else
536 			xpt_release_ccb(ccb);
537 
538 		break;
539 	}
540 	default:
541 		error = cam_periph_ioctl(periph, ap->a_cmd, addr, passerror);
542 		break;
543 	}
544 
545 	return(error);
546 }
547 
548 /*
549  * Generally, "ccb" should be the CCB supplied by the kernel.  "inccb"
550  * should be the CCB that is copied in from the user.
551  */
552 static int
553 passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb)
554 {
555 	struct pass_softc *softc;
556 	struct cam_periph_map_info mapinfo;
557 	int error, need_unmap;
558 
559 	softc = (struct pass_softc *)periph->softc;
560 
561 	need_unmap = 0;
562 
563 	/*
564 	 * There are some fields in the CCB header that need to be
565 	 * preserved, the rest we get from the user.
566 	 */
567 	xpt_merge_ccb(ccb, inccb);
568 
569 	/*
570 	 * There's no way for the user to have a completion
571 	 * function, so we put our own completion function in here.
572 	 */
573 	ccb->ccb_h.cbfcnp = passdone;
574 
575 	/*
576 	 * We only attempt to map the user memory into kernel space
577 	 * if they haven't passed in a physical memory pointer,
578 	 * and if there is actually an I/O operation to perform.
579 	 * Right now cam_periph_mapmem() only supports SCSI and device
580 	 * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
581 	 * there's actually data to map.  cam_periph_mapmem() will do the
582 	 * right thing, even if there isn't data to map, but since CCBs
583 	 * without data are a reasonably common occurance (e.g. test unit
584 	 * ready), it will save a few cycles if we check for it here.
585 	 */
586 	if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0)
587 	 && (((ccb->ccb_h.func_code == XPT_SCSI_IO)
588 	    && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE))
589 	  || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) {
590 
591 		bzero(&mapinfo, sizeof(mapinfo));
592 
593 		error = cam_periph_mapmem(ccb, &mapinfo);
594 
595 		/*
596 		 * cam_periph_mapmem returned an error, we can't continue.
597 		 * Return the error to the user.
598 		 */
599 		if (error)
600 			return(error);
601 
602 		/*
603 		 * We successfully mapped the memory in, so we need to
604 		 * unmap it when the transaction is done.
605 		 */
606 		need_unmap = 1;
607 	}
608 
609 	/*
610 	 * If the user wants us to perform any error recovery, then honor
611 	 * that request.  Otherwise, it's up to the user to perform any
612 	 * error recovery.
613 	 */
614 	error = cam_periph_runccb(ccb,
615 				  (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ?
616 				  passerror : NULL,
617 				  /* cam_flags */ CAM_RETRY_SELTO,
618 				  /* sense_flags */SF_RETRY_UA,
619 				  &softc->device_stats);
620 
621 	if (need_unmap != 0)
622 		cam_periph_unmapmem(ccb, &mapinfo);
623 
624 	ccb->ccb_h.cbfcnp = NULL;
625 	ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv;
626 	bcopy(ccb, inccb, sizeof(union ccb));
627 
628 	return(error);
629 }
630 
631 static int
632 passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
633 {
634 	struct cam_periph *periph;
635 	struct pass_softc *softc;
636 
637 	periph = xpt_path_periph(ccb->ccb_h.path);
638 	softc = (struct pass_softc *)periph->softc;
639 
640 	return(cam_periph_error(ccb, cam_flags, sense_flags,
641 				 &softc->saved_ccb));
642 }
643