1 /* @(#)scsi-sgi.c	1.38 09/11/28 Copyright 1997 J. Schilling */
2 #ifndef lint
3 static	char __sccsid[] =
4 	"@(#)scsi-sgi.c	1.38 09/11/28 Copyright 1997 J. Schilling";
5 #endif
6 /*
7  *	Interface for the SGI generic SCSI implementation.
8  *
9  *	First Hacky implementation
10  *	(needed libds, did not support bus scanning and had no error checking)
11  *	from "Frank van Beek" <frank@neogeo.nl>
12  *
13  *	Actual implementation supports all scg features.
14  *
15  *	Warning: you may change this source, but if you do that
16  *	you need to change the _scg_version and _scg_auth* string below.
17  *	You may not return "schily" for an SCG_AUTHOR request anymore.
18  *	Choose your name instead of "schily" and make clear that the version
19  *	string is related to a modified source.
20  *
21  *	Copyright (c) 1997 J. Schilling
22  */
23 /*
24  * The contents of this file are subject to the terms of the
25  * Common Development and Distribution License, Version 1.0 only
26  * (the "License").  You may not use this file except in compliance
27  * with the License.
28  *
29  * See the file CDDL.Schily.txt in this distribution for details.
30  * A copy of the CDDL is also available via the Internet at
31  * http://www.opensource.org/licenses/cddl1.txt
32  *
33  * The following exceptions apply:
34  * CDDL �3.6 needs to be replaced by: "You may create a Larger Work by
35  * combining Covered Software with other code if all other code is governed by
36  * the terms of a license that is OSI approved (see www.opensource.org) and
37  * you may distribute the Larger Work as a single product. In such a case,
38  * You must make sure the requirements of this License are fulfilled for
39  * the Covered Software."
40  *
41  * When distributing Covered Code, include this CDDL HEADER in each
42  * file and include the License file CDDL.Schily.txt from this distribution.
43  */
44 
45 #include <dslib.h>
46 
47 /*
48  *	Warning: you may change this source, but if you do that
49  *	you need to change the _scg_version and _scg_auth* string below.
50  *	You may not return "schily" for an SCG_AUTHOR request anymore.
51  *	Choose your name instead of "schily" and make clear that the version
52  *	string is related to a modified source.
53  */
54 LOCAL	char	_scg_trans_version[] = "scsi-sgi.c-1.38";	/* The version for this transport*/
55 
56 #ifdef	USE_DSLIB
57 
58 struct dsreq	*dsp = 0;
59 #define	MAX_SCG		1	/* Max # of SCSI controllers */
60 
61 #else
62 
63 #define	MAX_SCG		16	/* Max # of SCSI controllers */
64 #define	MAX_TGT		16
65 #define	MAX_LUN		8
66 
67 struct scg_local {
68 	short	scgfiles[MAX_SCG][MAX_TGT][MAX_LUN];
69 };
70 #define	scglocal(p)	((struct scg_local *)((p)->local))
71 
72 #endif
73 
74 #define	MAX_DMA_SGI	(256*1024)	/* Check if this is not too big */
75 
76 
77 #ifndef	USE_DSLIB
78 LOCAL	int	scg_sendreq	__PR((SCSI *scgp, struct scg_cmd *sp, struct dsreq *dsp));
79 #endif
80 
81 
82 /*
83  * Return version information for the low level SCSI transport code.
84  * This has been introduced to make it easier to trace down problems
85  * in applications.
86  */
87 LOCAL char *
scgo_version(scgp,what)88 scgo_version(scgp, what)
89 	SCSI	*scgp;
90 	int	what;
91 {
92 	if (scgp != (SCSI *)0) {
93 		switch (what) {
94 
95 		case SCG_VERSION:
96 			return (_scg_trans_version);
97 		/*
98 		 * If you changed this source, you are not allowed to
99 		 * return "schily" for the SCG_AUTHOR request.
100 		 */
101 		case SCG_AUTHOR:
102 			return (_scg_auth_schily);
103 		case SCG_SCCS_ID:
104 			return (__sccsid);
105 		}
106 	}
107 	return ((char *)0);
108 }
109 
110 LOCAL int
scgo_help(scgp,f)111 scgo_help(scgp, f)
112 	SCSI	*scgp;
113 	FILE	*f;
114 {
115 	__scg_help(f, "DS", "Generic SCSI",
116 		"", "bus,target,lun", "1,2,0", TRUE, FALSE);
117 	return (0);
118 }
119 
120 LOCAL int
scgo_open(scgp,device)121 scgo_open(scgp, device)
122 	SCSI	*scgp;
123 	char	*device;
124 {
125 		int	busno	= scg_scsibus(scgp);
126 		int	tgt	= scg_target(scgp);
127 		int	tlun	= scg_lun(scgp);
128 	register int	f;
129 	register int	b;
130 	register int	t;
131 	register int	l;
132 	register int	nopen = 0;
133 	char		devname[64];
134 
135 	if (busno >= MAX_SCG || tgt >= MAX_TGT || tlun >= MAX_LUN) {
136 		errno = EINVAL;
137 		if (scgp->errstr)
138 			js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
139 				"Illegal value for busno, target or lun '%d,%d,%d'",
140 				busno, tgt, tlun);
141 		return (-1);
142 	}
143 
144 	if ((device != NULL && *device != '\0') || (busno == -2 && tgt == -2)) {
145 		errno = EINVAL;
146 		if (scgp->errstr)
147 			js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
148 				"Open by 'devname' not supported on this OS");
149 		return (-1);
150 	}
151 
152 	if (scgp->local == NULL) {
153 		scgp->local = malloc(sizeof (struct scg_local));
154 		if (scgp->local == NULL)
155 			return (0);
156 
157 		for (b = 0; b < MAX_SCG; b++) {
158 			for (t = 0; t < MAX_TGT; t++) {
159 				for (l = 0; l < MAX_LUN; l++)
160 					scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
161 			}
162 		}
163 	}
164 
165 	if (busno >= 0 && tgt >= 0 && tlun >= 0) {
166 
167 		js_snprintf(devname, sizeof (devname),
168 				"/dev/scsi/sc%dd%dl%d", busno, tgt, tlun);
169 #ifdef	USE_DSLIB
170 		dsp = dsopen(devname, O_RDWR);
171 		if (dsp == 0)
172 			return (-1);
173 #else
174 		f = open(devname, O_RDWR);
175 		if (f < 0) {
176 			if (scgp->errstr)
177 				js_snprintf(scgp->errstr, SCSI_ERRSTR_SIZE,
178 					"Cannot open '%s'",
179 					devname);
180 			return (-1);
181 		}
182 		scglocal(scgp)->scgfiles[busno][tgt][tlun] = f;
183 #endif
184 		return (1);
185 	} else {
186 #ifdef	USE_DSLIB
187 		return (-1);
188 #else
189 		for (b = 0; b < MAX_SCG; b++) {
190 			for (t = 0; t < MAX_TGT; t++) {
191 /*				for (l = 0; l < MAX_LUN; l++) {*/
192 				for (l = 0; l < 1; l++) {
193 					js_snprintf(devname, sizeof (devname),
194 							"/dev/scsi/sc%dd%dl%d", b, t, l);
195 					f = open(devname, O_RDWR);
196 					if (f >= 0) {
197 						scglocal(scgp)->scgfiles[b][t][l] = (short)f;
198 						nopen++;
199 					}
200 				}
201 			}
202 		}
203 #endif
204 	}
205 	return (nopen);
206 }
207 
208 LOCAL int
scgo_close(scgp)209 scgo_close(scgp)
210 	SCSI	*scgp;
211 {
212 #ifndef	USE_DSLIB
213 	register int	f;
214 	register int	b;
215 	register int	t;
216 	register int	l;
217 
218 	if (scgp->local == NULL)
219 		return (-1);
220 
221 	for (b = 0; b < MAX_SCG; b++) {
222 		for (t = 0; t < MAX_TGT; t++) {
223 			for (l = 0; l < MAX_LUN; l++) {
224 				f = scglocal(scgp)->scgfiles[b][t][l];
225 				if (f >= 0)
226 					close(f);
227 				scglocal(scgp)->scgfiles[b][t][l] = (short)-1;
228 			}
229 		}
230 	}
231 #else
232 	dsclose(dsp);
233 #endif
234 	return (0);
235 }
236 
237 LOCAL long
scgo_maxdma(scgp,amt)238 scgo_maxdma(scgp, amt)
239 	SCSI	*scgp;
240 	long	amt;
241 {
242 	return (MAX_DMA_SGI);
243 }
244 
245 LOCAL void *
scgo_getbuf(scgp,amt)246 scgo_getbuf(scgp, amt)
247 	SCSI	*scgp;
248 	long	amt;
249 {
250 	if (scgp->debug > 0) {
251 		js_fprintf((FILE *)scgp->errfile,
252 				"scgo_getbuf: %ld bytes\n", amt);
253 	}
254 	scgp->bufbase = valloc((size_t)(amt));
255 	return (scgp->bufbase);
256 }
257 
258 LOCAL void
scgo_freebuf(scgp)259 scgo_freebuf(scgp)
260 	SCSI	*scgp;
261 {
262 	if (scgp->bufbase)
263 		free(scgp->bufbase);
264 	scgp->bufbase = NULL;
265 }
266 
267 LOCAL int
scgo_numbus(scgp)268 scgo_numbus(scgp)
269 	SCSI	*scgp;
270 {
271 	return (MAX_SCG);
272 }
273 
274 LOCAL BOOL
scgo_havebus(scgp,busno)275 scgo_havebus(scgp, busno)
276 	SCSI	*scgp;
277 	int	busno;
278 {
279 	register int	t;
280 	register int	l;
281 
282 	if (busno < 0 || busno >= MAX_SCG)
283 		return (FALSE);
284 
285 	if (scgp->local == NULL)
286 		return (FALSE);
287 
288 	for (t = 0; t < MAX_TGT; t++) {
289 		for (l = 0; l < MAX_LUN; l++)
290 			if (scglocal(scgp)->scgfiles[busno][t][l] >= 0)
291 				return (TRUE);
292 	}
293 	return (FALSE);
294 }
295 
296 LOCAL int
scgo_fileno(scgp,busno,tgt,tlun)297 scgo_fileno(scgp, busno, tgt, tlun)
298 	SCSI	*scgp;
299 	int	busno;
300 	int	tgt;
301 	int	tlun;
302 {
303 #ifdef	USE_DSLIB
304 	if (dsp == NULL)
305 		return (-1);
306 	return (getfd(dsp));
307 #else
308 	if (busno < 0 || busno >= MAX_SCG ||
309 	    tgt < 0 || tgt >= MAX_TGT ||
310 	    tlun < 0 || tlun >= MAX_LUN)
311 		return (-1);
312 
313 	if (scgp->local == NULL)
314 		return (-1);
315 
316 	return ((int)scglocal(scgp)->scgfiles[busno][tgt][tlun]);
317 #endif
318 }
319 
320 LOCAL int
scgo_initiator_id(scgp)321 scgo_initiator_id(scgp)
322 	SCSI	*scgp;
323 {
324 	return (-1);
325 }
326 
327 LOCAL int
scgo_isatapi(scgp)328 scgo_isatapi(scgp)
329 	SCSI	*scgp;
330 {
331 	return (FALSE);
332 }
333 
334 LOCAL int
scgo_reset(scgp,what)335 scgo_reset(scgp, what)
336 	SCSI	*scgp;
337 	int	what;
338 {
339 	/*
340 	 * Do we have a SCSI reset on SGI?
341 	 */
342 #ifdef	DS_RESET
343 	if (what == SCG_RESET_NOP)
344 		return (0);
345 	if (what != SCG_RESET_BUS) {
346 		errno = EINVAL;
347 		return (-1);
348 	}
349 	/*
350 	 * XXX Does this reset TGT or BUS ???
351 	 */
352 	return (ioctl(scgp->fd, DS_RESET, 0));
353 #else
354 	return (-1);
355 #endif
356 }
357 
358 #ifndef	USE_DSLIB
359 LOCAL int
scg_sendreq(scgp,sp,dsp)360 scg_sendreq(scgp, sp, dsp)
361 	SCSI		*scgp;
362 	struct scg_cmd	*sp;
363 	struct dsreq	*dsp;
364 {
365 	int	ret;
366 	int	retries = 4;
367 	Uchar	status;
368 
369 /*	if ((sp->flags & SCG_CMD_RETRY) == 0)*/
370 /*		retries = 0;*/
371 
372 	while (--retries > 0) {
373 		ret = ioctl(scgp->fd, DS_ENTER, dsp);
374 		if (ret < 0)  {
375 			RET(dsp) = DSRT_DEVSCSI;
376 			return (-1);
377 		}
378 		/*
379 		 * SGI implementattion botch!!!
380 		 * If a target does not select the bus,
381 		 * the return code is DSRT_TIMEOUT
382 		 */
383 		if (RET(dsp) == DSRT_TIMEOUT) {
384 			struct timeval to;
385 
386 			to.tv_sec = TIME(dsp)/1000;
387 			to.tv_usec = TIME(dsp)%1000;
388 			__scg_times(scgp);
389 
390 			if (sp->cdb.g0_cdb.cmd == SC_TEST_UNIT_READY &&
391 			    (scgp->cmdstop->tv_sec < to.tv_sec ||
392 			    (scgp->cmdstop->tv_sec == to.tv_sec &&
393 				scgp->cmdstop->tv_usec < to.tv_usec))) {
394 
395 				RET(dsp) = DSRT_NOSEL;
396 				return (-1);
397 			}
398 		}
399 		if (RET(dsp) == DSRT_NOSEL)
400 			continue;		/* retry noselect 3X */
401 
402 		status = STATUS(dsp);
403 		switch (status) {
404 
405 		case 0x08:		/*  BUSY */
406 		case 0x18:		/*  RESERV CONFLICT */
407 			if (retries > 0)
408 				sleep(2);
409 			continue;
410 		case 0x00:		/*  GOOD */
411 		case 0x02:		/*  CHECK CONDITION */
412 		case 0x10:		/*  INTERM/GOOD */
413 		default:
414 			return (status);
415 		}
416 	}
417 	return (-1);	/* failed retry limit */
418 }
419 #endif
420 
421 LOCAL int
scgo_send(scgp)422 scgo_send(scgp)
423 	SCSI		*scgp;
424 {
425 	struct scg_cmd	*sp = scgp->scmd;
426 	int	ret;
427 	int flags;
428 #ifndef	USE_DSLIB
429 	struct dsreq	ds;
430 	struct dsreq	*dsp = &ds;
431 
432 	dsp->ds_iovbuf = 0;
433 	dsp->ds_iovlen = 0;
434 #endif
435 
436 	if (scgp->fd < 0) {
437 		sp->error = SCG_FATAL;
438 		return (0);
439 	}
440 
441 	flags = DSRQ_SENSE;
442 	if (sp->flags & SCG_RECV_DATA)
443 		flags |= DSRQ_READ;
444 	else if (sp->size > 0)
445 		flags |= DSRQ_WRITE;
446 
447 	dsp->ds_flags	= flags;
448 	dsp->ds_link	= 0;
449 	dsp->ds_synch	= 0;
450 	dsp->ds_ret  	= 0;
451 
452 	DATABUF(dsp) 	= sp->addr;
453 	DATALEN(dsp)	= sp->size;
454 	CMDBUF(dsp)	= (void *) &sp->cdb;
455 	CMDLEN(dsp)	= sp->cdb_len;
456 	SENSEBUF(dsp)	= (caddr_t)sp->u_sense.cmd_sense;
457 	SENSELEN(dsp)	= sizeof (sp->u_sense.cmd_sense);
458 	TIME(dsp)	= (sp->timeout * 1000) + 100;
459 
460 	errno		= 0;
461 	sp->ux_errno	= 0;
462 	sp->sense_count	= 0;
463 
464 #ifdef	USE_DSLIB
465 	ret = doscsireq(scgp->fd, dsp);
466 #else
467 	ret = scg_sendreq(scgp, sp, dsp);
468 #endif
469 
470 	if (RET(dsp) != DSRT_DEVSCSI)
471 		ret = 0;
472 
473 	if (RET(dsp)) {
474 		if (RET(dsp) == DSRT_SHORT) {
475 			sp->resid = DATALEN(dsp)- DATASENT(dsp);
476 		} else if (errno) {
477 			sp->ux_errno = errno;
478 		} else {
479 			sp->ux_errno = EIO;
480 		}
481 
482 		sp->u_scb.cmd_scb[0] = STATUS(dsp);
483 
484 		sp->sense_count = SENSESENT(dsp);
485 		if (sp->sense_count > SCG_MAX_SENSE)
486 			sp->sense_count = SCG_MAX_SENSE;
487 
488 	}
489 	switch (RET(dsp)) {
490 
491 	default:
492 		sp->error = SCG_RETRYABLE;	break;
493 
494 	case 0:			/* OK					*/
495 	case DSRT_SHORT:	/* not implemented			 */
496 		sp->error = SCG_NO_ERROR;	break;
497 
498 	case DSRT_UNIMPL:	/* not implemented			*/
499 	case DSRT_REVCODE:	/* software obsolete must recompile 	*/
500 	case DSRT_NOSEL:
501 		sp->u_scb.cmd_scb[0] = 0;
502 		sp->error = SCG_FATAL;		break;
503 
504 	case DSRT_TIMEOUT:
505 		sp->u_scb.cmd_scb[0] = 0;
506 		sp->error = SCG_TIMEOUT;	break;
507 	}
508 	return (ret);
509 }
510