xref: /dragonfly/sys/bus/cam/scsi/scsi_pass.c (revision 32c20b8b) 
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 1.27 2008/05/18 20:30:20 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 #include "../cam_sim.h"
53 
54 #include "scsi_all.h"
55 #include "scsi_message.h"
56 #include "scsi_da.h"
57 #include "scsi_pass.h"
58 
59 typedef enum {
60 	PASS_FLAG_OPEN			= 0x01,
61 	PASS_FLAG_LOCKED		= 0x02,
62 	PASS_FLAG_INVALID		= 0x04
63 } pass_flags;
64 
65 typedef enum {
66 	PASS_STATE_NORMAL
67 } pass_state;
68 
69 typedef enum {
70 	PASS_CCB_BUFFER_IO,
71 	PASS_CCB_WAITING
72 } pass_ccb_types;
73 
74 #define ccb_type	ppriv_field0
75 #define ccb_bio		ppriv_ptr1
76 
77 struct pass_softc {
78 	pass_state	state;
79 	pass_flags	flags;
80 	u_int8_t	pd_type;
81 	union ccb	saved_ccb;
82 	struct devstat	device_stats;
83 };
84 
85 #define PASS_CDEV_MAJOR 31
86 
87 static	d_open_t	passopen;
88 static	d_close_t	passclose;
89 static	d_ioctl_t	passioctl;
90 
91 static	periph_init_t	passinit;
92 static	periph_ctor_t	passregister;
93 static	periph_oninv_t	passoninvalidate;
94 static	periph_dtor_t	passcleanup;
95 static	periph_start_t	passstart;
96 static	void		passasync(void *callback_arg, u_int32_t code,
97 				  struct cam_path *path, void *arg);
98 static	void		passdone(struct cam_periph *periph,
99 				 union ccb *done_ccb);
100 static	int		passerror(union ccb *ccb, u_int32_t cam_flags,
101 				  u_int32_t sense_flags);
102 static 	int		passsendccb(struct cam_periph *periph, union ccb *ccb,
103 				    union ccb *inccb);
104 
105 static struct periph_driver passdriver =
106 {
107 	passinit, "pass",
108 	TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0
109 };
110 
111 PERIPHDRIVER_DECLARE(pass, passdriver);
112 
113 static struct dev_ops pass_ops = {
114 	{ "pass", PASS_CDEV_MAJOR, 0 },
115 	.d_open =	passopen,
116 	.d_close =	passclose,
117 	.d_read =	noread,
118 	.d_write =	nowrite,
119 	.d_ioctl =	passioctl,
120 	.d_strategy =	nostrategy,
121 };
122 
123 static struct extend_array *passperiphs;
124 
125 static void
126 passinit(void)
127 {
128 	cam_status status;
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_register_async(AC_FOUND_DEVICE, passasync, NULL, NULL);
144 
145 	if (status != CAM_REQ_CMP) {
146 		kprintf("pass: Failed to attach master async callback "
147 		       "due to status 0x%x!\n", status);
148 	}
149 
150 }
151 
152 static void
153 passoninvalidate(struct cam_periph *periph)
154 {
155 	struct pass_softc *softc;
156 
157 	softc = (struct pass_softc *)periph->softc;
158 
159 	/*
160 	 * De-register any async callbacks.
161 	 */
162 	xpt_register_async(0, passasync, periph, periph->path);
163 
164 	softc->flags |= PASS_FLAG_INVALID;
165 
166 	if (bootverbose) {
167 		xpt_print(periph->path, "lost device\n");
168 	}
169 
170 }
171 
172 static void
173 passcleanup(struct cam_periph *periph)
174 {
175 	struct pass_softc *softc;
176 
177 	softc = (struct pass_softc *)periph->softc;
178 
179 	devstat_remove_entry(&softc->device_stats);
180 
181 	cam_extend_release(passperiphs, periph->unit_number);
182 
183 	if (bootverbose) {
184 		xpt_print(periph->path, "removing device entry\n");
185 	}
186 	dev_ops_remove_minor(&pass_ops, periph->unit_number);
187 	kfree(softc, M_DEVBUF);
188 }
189 
190 static void
191 passasync(void *callback_arg, u_int32_t code,
192 	  struct cam_path *path, void *arg)
193 {
194 	struct cam_periph *periph;
195 	struct cam_sim *sim;
196 
197 	periph = (struct cam_periph *)callback_arg;
198 
199 	switch (code) {
200 	case AC_FOUND_DEVICE:
201 	{
202 		struct ccb_getdev *cgd;
203 		cam_status status;
204 
205 		cgd = (struct ccb_getdev *)arg;
206 		if (cgd == NULL)
207 			break;
208 
209 		/*
210 		 * Don't complain if a valid peripheral is already attached.
211 		 */
212 		periph = cam_periph_find(cgd->ccb_h.path, "pass");
213 		if (periph && (periph->flags & CAM_PERIPH_INVALID) == 0)
214 			break;
215 
216 		/*
217 		 * Allocate a peripheral instance for
218 		 * this device and start the probe
219 		 * process.
220 		 */
221 		sim = xpt_path_sim(cgd->ccb_h.path);
222 		status = cam_periph_alloc(passregister, passoninvalidate,
223 					  passcleanup, passstart, "pass",
224 					  CAM_PERIPH_BIO, cgd->ccb_h.path,
225 					  passasync, AC_FOUND_DEVICE, cgd);
226 
227 		if (status != CAM_REQ_CMP && status != CAM_REQ_INPROG) {
228 			const struct cam_status_entry *entry;
229 
230 			entry = cam_fetch_status_entry(status);
231 
232 			kprintf("passasync: Unable to attach new device "
233 				"due to status %#x: %s\n", status, entry ?
234 				entry->status_text : "Unknown");
235 		}
236 
237 		break;
238 	}
239 	default:
240 		cam_periph_async(periph, code, path, arg);
241 		break;
242 	}
243 }
244 
245 static cam_status
246 passregister(struct cam_periph *periph, void *arg)
247 {
248 	struct pass_softc *softc;
249 	struct ccb_getdev *cgd;
250 	int    no_tags;
251 
252 	cgd = (struct ccb_getdev *)arg;
253 	if (periph == NULL) {
254 		kprintf("passregister: periph was NULL!!\n");
255 		return(CAM_REQ_CMP_ERR);
256 	}
257 
258 	if (cgd == NULL) {
259 		kprintf("passregister: no getdev CCB, can't register device\n");
260 		return(CAM_REQ_CMP_ERR);
261 	}
262 
263 	softc = kmalloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
264 	softc->state = PASS_STATE_NORMAL;
265 	softc->pd_type = SID_TYPE(&cgd->inq_data);
266 
267 	periph->softc = softc;
268 	cam_extend_set(passperiphs, periph->unit_number, periph);
269 
270 	/*
271 	 * We pass in 0 for a blocksize, since we don't
272 	 * know what the blocksize of this device is, if
273 	 * it even has a blocksize.
274 	 */
275 	CAM_SIM_UNLOCK(periph->sim);
276 	no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0;
277 	devstat_add_entry(&softc->device_stats, "pass", periph->unit_number, 0,
278 			  DEVSTAT_NO_BLOCKSIZE
279 			  | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0),
280 			  softc->pd_type |
281 			  DEVSTAT_TYPE_IF_SCSI |
282 			  DEVSTAT_TYPE_PASS,
283 			  DEVSTAT_PRIORITY_PASS);
284 
285 	/* Register the device */
286 	make_dev(&pass_ops, periph->unit_number, UID_ROOT,
287 		  GID_OPERATOR, 0600, "%s%d", periph->periph_name,
288 		  periph->unit_number);
289 	CAM_SIM_LOCK(periph->sim);
290 	/*
291 	 * Add an async callback so that we get
292 	 * notified if this device goes away.
293 	 */
294 	xpt_register_async(AC_LOST_DEVICE, passasync, periph, periph->path);
295 
296 	if (bootverbose)
297 		xpt_announce_periph(periph, NULL);
298 
299 	return(CAM_REQ_CMP);
300 }
301 
302 static int
303 passopen(struct dev_open_args *ap)
304 {
305 	cdev_t dev = ap->a_head.a_dev;
306 	struct cam_periph *periph;
307 	struct pass_softc *softc;
308 	int unit, error;
309 
310 	error = 0; /* default to no error */
311 
312 	/* unit = dkunit(dev); */
313 	/* XXX KDM fix this */
314 	unit = minor(dev) & 0xff;
315 
316 	periph = cam_extend_get(passperiphs, unit);
317 
318 	if (cam_periph_acquire(periph) != CAM_REQ_CMP)
319 		return (ENXIO);
320 
321 	cam_periph_lock(periph);
322 
323 	softc = (struct pass_softc *)periph->softc;
324 
325 	if (softc->flags & PASS_FLAG_INVALID) {
326 		cam_periph_unlock(periph);
327 		cam_periph_release(periph);
328 		return(ENXIO);
329 	}
330 
331 	/*
332 	 * Don't allow access when we're running at a high securelevel.
333 	 */
334 	if (securelevel > 1) {
335 		cam_periph_unlock(periph);
336 		cam_periph_release(periph);
337 		return(EPERM);
338 	}
339 
340 	/*
341 	 * Only allow read-write access.
342 	 */
343 	if (((ap->a_oflags & FWRITE) == 0) || ((ap->a_oflags & FREAD) == 0)) {
344 		cam_periph_unlock(periph);
345 		cam_periph_release(periph);
346 		return(EPERM);
347 	}
348 
349 	/*
350 	 * We don't allow nonblocking access.
351 	 */
352 	if ((ap->a_oflags & O_NONBLOCK) != 0) {
353 		xpt_print(periph->path, "can't do nonblocking access\n");
354 		cam_periph_unlock(periph);
355 		cam_periph_release(periph);
356 		return(EINVAL);
357 	}
358 
359 	if ((softc->flags & PASS_FLAG_OPEN) == 0) {
360 		softc->flags |= PASS_FLAG_OPEN;
361 	} else {
362 		/* Device closes aren't symmertical, so fix up the refcount */
363 		cam_periph_release(periph);
364 	}
365 
366 	cam_periph_unlock(periph);
367 
368 	return (error);
369 }
370 
371 static int
372 passclose(struct dev_close_args *ap)
373 {
374 	cdev_t dev = ap->a_head.a_dev;
375 	struct 	cam_periph *periph;
376 	struct	pass_softc *softc;
377 	int	unit;
378 
379 	/* unit = dkunit(dev); */
380 	/* XXX KDM fix this */
381 	unit = minor(dev) & 0xff;
382 
383 	periph = cam_extend_get(passperiphs, unit);
384 	if (periph == NULL)
385 		return (ENXIO);
386 
387 	cam_periph_lock(periph);
388 
389 	softc = (struct pass_softc *)periph->softc;
390 	softc->flags &= ~PASS_FLAG_OPEN;
391 
392 	cam_periph_unlock(periph);
393 	cam_periph_release(periph);
394 
395 	return (0);
396 }
397 
398 static void
399 passstart(struct cam_periph *periph, union ccb *start_ccb)
400 {
401 	struct pass_softc *softc;
402 
403 	softc = (struct pass_softc *)periph->softc;
404 
405 	switch (softc->state) {
406 	case PASS_STATE_NORMAL:
407 		start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING;
408 		SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
409 				  periph_links.sle);
410 		periph->immediate_priority = CAM_PRIORITY_NONE;
411 		wakeup(&periph->ccb_list);
412 		break;
413 	}
414 }
415 
416 static void
417 passdone(struct cam_periph *periph, union ccb *done_ccb)
418 {
419 	struct pass_softc *softc;
420 	struct ccb_scsiio *csio;
421 
422 	softc = (struct pass_softc *)periph->softc;
423 	csio = &done_ccb->csio;
424 	switch (csio->ccb_h.ccb_type) {
425 	case PASS_CCB_WAITING:
426 		/* Caller will release the CCB */
427 		wakeup(&done_ccb->ccb_h.cbfcnp);
428 		return;
429 	}
430 	xpt_release_ccb(done_ccb);
431 }
432 
433 static int
434 passioctl(struct dev_ioctl_args *ap)
435 {
436 	cdev_t dev = ap->a_head.a_dev;
437 	caddr_t addr = ap->a_data;
438 	struct 	cam_periph *periph;
439 	struct	pass_softc *softc;
440 	u_int8_t unit;
441 	int      error;
442 
443 
444 	/* unit = dkunit(dev); */
445 	/* XXX KDM fix this */
446 	unit = minor(dev) & 0xff;
447 
448 	periph = cam_extend_get(passperiphs, unit);
449 
450 	if (periph == NULL)
451 		return(ENXIO);
452 
453 	cam_periph_lock(periph);
454 	softc = (struct pass_softc *)periph->softc;
455 
456 	error = 0;
457 
458 	switch (ap->a_cmd) {
459 
460 	case CAMIOCOMMAND:
461 	{
462 		union ccb *inccb;
463 		union ccb *ccb;
464 		int ccb_malloced;
465 
466 		inccb = (union ccb *)addr;
467 
468 		/*
469 		 * Some CCB types, like scan bus and scan lun can only go
470 		 * through the transport layer device.
471 		 */
472 		if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) {
473 			xpt_print(periph->path, "CCB function code %#x is "
474 			    "restricted to the XPT device\n",
475 			    inccb->ccb_h.func_code);
476 			error = ENODEV;
477 			break;
478 		}
479 
480 		/*
481 		 * Non-immediate CCBs need a CCB from the per-device pool
482 		 * of CCBs, which is scheduled by the transport layer.
483 		 * Immediate CCBs and user-supplied CCBs should just be
484 		 * malloced.
485 		 */
486 		if ((inccb->ccb_h.func_code & XPT_FC_QUEUED)
487 		 && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) {
488 			ccb = cam_periph_getccb(periph,
489 						inccb->ccb_h.pinfo.priority);
490 			ccb_malloced = 0;
491 		} else {
492 			ccb = xpt_alloc_ccb();
493 
494 			if (ccb != NULL)
495 				xpt_setup_ccb(&ccb->ccb_h, periph->path,
496 					      inccb->ccb_h.pinfo.priority);
497 			ccb_malloced = 1;
498 		}
499 
500 		if (ccb == NULL) {
501 			xpt_print(periph->path, "unable to allocate CCB\n");
502 			error = ENOMEM;
503 			break;
504 		}
505 
506 		error = passsendccb(periph, ccb, inccb);
507 
508 		if (ccb_malloced)
509 			xpt_free_ccb(ccb);
510 		else
511 			xpt_release_ccb(ccb);
512 
513 		break;
514 	}
515 	default:
516 		error = cam_periph_ioctl(periph, ap->a_cmd, addr, passerror);
517 		break;
518 	}
519 
520 	cam_periph_unlock(periph);
521 	return(error);
522 }
523 
524 /*
525  * Generally, "ccb" should be the CCB supplied by the kernel.  "inccb"
526  * should be the CCB that is copied in from the user.
527  */
528 static int
529 passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb)
530 {
531 	struct pass_softc *softc;
532 	struct cam_periph_map_info mapinfo;
533 	int error, need_unmap;
534 
535 	softc = (struct pass_softc *)periph->softc;
536 
537 	need_unmap = 0;
538 
539 	/*
540 	 * There are some fields in the CCB header that need to be
541 	 * preserved, the rest we get from the user.
542 	 */
543 	xpt_merge_ccb(ccb, inccb);
544 
545 	/*
546 	 * There's no way for the user to have a completion
547 	 * function, so we put our own completion function in here.
548 	 */
549 	ccb->ccb_h.cbfcnp = passdone;
550 
551 	/*
552 	 * We only attempt to map the user memory into kernel space
553 	 * if they haven't passed in a physical memory pointer,
554 	 * and if there is actually an I/O operation to perform.
555 	 * Right now cam_periph_mapmem() only supports SCSI and device
556 	 * match CCBs.  For the SCSI CCBs, we only pass the CCB in if
557 	 * there's actually data to map.  cam_periph_mapmem() will do the
558 	 * right thing, even if there isn't data to map, but since CCBs
559 	 * without data are a reasonably common occurance (e.g. test unit
560 	 * ready), it will save a few cycles if we check for it here.
561 	 */
562 	if (((ccb->ccb_h.flags & CAM_DATA_PHYS) == 0)
563 	 && (((ccb->ccb_h.func_code == XPT_SCSI_IO)
564 	    && ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE))
565 	  || (ccb->ccb_h.func_code == XPT_DEV_MATCH))) {
566 
567 		bzero(&mapinfo, sizeof(mapinfo));
568 
569 		/*
570 		 * cam_periph_mapmem calls into proc and vm functions that can
571 		 * sleep as well as trigger I/O, so we can't hold the lock.
572 		 * Dropping it here is reasonably safe.
573 		 */
574 		cam_periph_unlock(periph);
575 		error = cam_periph_mapmem(ccb, &mapinfo);
576 		cam_periph_lock(periph);
577 
578 		/*
579 		 * cam_periph_mapmem returned an error, we can't continue.
580 		 * Return the error to the user.
581 		 */
582 		if (error)
583 			return(error);
584 
585 		/*
586 		 * We successfully mapped the memory in, so we need to
587 		 * unmap it when the transaction is done.
588 		 */
589 		need_unmap = 1;
590 	}
591 
592 	/*
593 	 * If the user wants us to perform any error recovery, then honor
594 	 * that request.  Otherwise, it's up to the user to perform any
595 	 * error recovery.
596 	 */
597 	error = cam_periph_runccb(ccb,
598 				  (ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ?
599 				  passerror : NULL,
600 				  /* cam_flags */ CAM_RETRY_SELTO,
601 				  /* sense_flags */SF_RETRY_UA,
602 				  &softc->device_stats);
603 
604 	if (need_unmap != 0)
605 		cam_periph_unmapmem(ccb, &mapinfo);
606 
607 	ccb->ccb_h.cbfcnp = NULL;
608 	ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv;
609 	bcopy(ccb, inccb, sizeof(union ccb));
610 
611 	return(error);
612 }
613 
614 static int
615 passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
616 {
617 	struct cam_periph *periph;
618 	struct pass_softc *softc;
619 
620 	periph = xpt_path_periph(ccb->ccb_h.path);
621 	softc = (struct pass_softc *)periph->softc;
622 
623 	return(cam_periph_error(ccb, cam_flags, sense_flags,
624 				 &softc->saved_ccb));
625 }
626