1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 1990, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 #include <sys/param.h>
26 #include <sys/modctl.h>
27 #include <sys/modhash.h>
28 #include <sys/open.h>
29 #include <sys/conf.h>
30 #include <sys/errno.h>
31 #include <sys/sysmacros.h>
32 #include <sys/kmem.h>
33 #include <sys/cmn_err.h>
34 #include <sys/stat.h>
35 #include <sys/mode.h>
36 #include <sys/pathname.h>
37 #include <sys/vnode.h>
38 #include <sys/ddi_impldefs.h>
39 #include <sys/ddi_implfuncs.h>
40 #include <sys/esunddi.h>
41 #include <sys/sunddi.h>
42 #include <sys/sunndi.h>
43 #include <sys/systeminfo.h>
44 #include <sys/hwconf.h>
45 #include <sys/file.h>
46 #include <sys/varargs.h>
47 #include <sys/thread.h>
48 #include <sys/cred.h>
49 #include <sys/autoconf.h>
50 #include <sys/kobj.h>
51 #include <sys/consdev.h>
52 #include <sys/systm.h>
53 #include <sys/debug.h>
54 #include <sys/atomic.h>
55
56 extern struct dev_ops nodev_ops;
57 extern struct dev_ops mod_nodev_ops;
58
59 struct mod_noload {
60 struct mod_noload *mn_next;
61 char *mn_name;
62 };
63
64 /*
65 * Function prototypes
66 */
67 static int init_stubs(struct modctl *, struct mod_modinfo *);
68 static int nm_hash(const char *);
69 static void make_syscallname(const char *, int);
70 static void hwc_hash_init();
71 static void hwc_hash(struct hwc_spec *, major_t);
72 static void hwc_unhash(struct hwc_spec *);
73
74 int
major_valid(major_t major)75 major_valid(major_t major)
76 {
77 return (major != DDI_MAJOR_T_NONE && major < devcnt);
78 }
79
80 int
driver_installed(major_t major)81 driver_installed(major_t major)
82 {
83 return (major_valid(major) && devnamesp[major].dn_name != NULL);
84 }
85
86 int
driver_active(major_t major)87 driver_active(major_t major)
88 {
89 return (driver_installed(major) && !(devnamesp[major].dn_flags &
90 (DN_DRIVER_REMOVED|DN_DRIVER_INACTIVE)));
91 }
92
93 struct dev_ops *
mod_hold_dev_by_major(major_t major)94 mod_hold_dev_by_major(major_t major)
95 {
96 struct dev_ops **devopspp, *ops;
97 int loaded;
98 char *drvname;
99
100 if (!driver_active(major))
101 return (NULL);
102
103 LOCK_DEV_OPS(&(devnamesp[major].dn_lock));
104 devopspp = &devopsp[major];
105 loaded = 1;
106 while (loaded && !CB_DRV_INSTALLED(*devopspp)) {
107 UNLOCK_DEV_OPS(&(devnamesp[major].dn_lock));
108 drvname = mod_major_to_name(major);
109 if (drvname == NULL)
110 return (NULL);
111 loaded = (modload("drv", drvname) != -1);
112 LOCK_DEV_OPS(&(devnamesp[major].dn_lock));
113 }
114 if (loaded) {
115 INCR_DEV_OPS_REF(*devopspp);
116 ops = *devopspp;
117 } else {
118 ops = NULL;
119 }
120 UNLOCK_DEV_OPS(&(devnamesp[major].dn_lock));
121 return (ops);
122 }
123
124 #ifdef DEBUG_RELE
125 static int mod_rele_pause = DEBUG_RELE;
126 #endif /* DEBUG_RELE */
127
128 void
mod_rele_dev_by_major(major_t major)129 mod_rele_dev_by_major(major_t major)
130 {
131 struct dev_ops *ops;
132 struct devnames *dnp;
133
134 if (!driver_active(major))
135 return;
136
137 dnp = &devnamesp[major];
138 LOCK_DEV_OPS(&dnp->dn_lock);
139 ops = devopsp[major];
140 ASSERT(CB_DRV_INSTALLED(ops));
141
142 #ifdef DEBUG_RELE
143 if (!DEV_OPS_HELD(ops)) {
144 char *s;
145 static char *msg = "mod_rele_dev_by_major: unheld driver!";
146
147 printf("mod_rele_dev_by_major: Major dev <%u>, name <%s>\n",
148 (uint_t)major,
149 (s = mod_major_to_name(major)) ? s : "unknown");
150 if (mod_rele_pause)
151 debug_enter(msg);
152 else
153 printf("%s\n", msg);
154 UNLOCK_DEV_OPS(&dnp->dn_lock);
155 return; /* XXX: Note changed behavior */
156 }
157
158 #endif /* DEBUG_RELE */
159
160 if (!DEV_OPS_HELD(ops)) {
161 cmn_err(CE_PANIC,
162 "mod_rele_dev_by_major: Unheld driver: major number <%u>",
163 (uint_t)major);
164 }
165 DECR_DEV_OPS_REF(ops);
166 UNLOCK_DEV_OPS(&dnp->dn_lock);
167 }
168
169 struct dev_ops *
mod_hold_dev_by_devi(dev_info_t * devi)170 mod_hold_dev_by_devi(dev_info_t *devi)
171 {
172 major_t major;
173 char *name;
174
175 name = ddi_get_name(devi);
176 if ((major = mod_name_to_major(name)) == DDI_MAJOR_T_NONE)
177 return (NULL);
178 return (mod_hold_dev_by_major(major));
179 }
180
181 void
mod_rele_dev_by_devi(dev_info_t * devi)182 mod_rele_dev_by_devi(dev_info_t *devi)
183 {
184 major_t major;
185 char *name;
186
187 name = ddi_get_name(devi);
188 if ((major = mod_name_to_major(name)) == DDI_MAJOR_T_NONE)
189 return;
190 mod_rele_dev_by_major(major);
191 }
192
193 int
nomod_zero()194 nomod_zero()
195 {
196 return (0);
197 }
198
199 int
nomod_minus_one()200 nomod_minus_one()
201 {
202 return (-1);
203 }
204
205 int
nomod_einval()206 nomod_einval()
207 {
208 return (EINVAL);
209 }
210
211 void
nomod_void()212 nomod_void()
213 {
214 /* nothing */
215 }
216
217 /*
218 * Install all the stubs for a module.
219 * Return zero if there were no errors or an errno value.
220 */
221 int
install_stubs_by_name(struct modctl * modp,const char * name)222 install_stubs_by_name(struct modctl *modp, const char *name)
223 {
224 char *p;
225 const char *filenamep, *iter;
226 char namebuf[MODMAXNAMELEN + 12];
227 struct mod_modinfo *mp;
228
229 iter = name;
230 filenamep = name;
231
232 while (*iter) {
233 if (*iter++ == '/')
234 filenamep = iter;
235 }
236
237 /*
238 * Concatenate "name" with "_modname" then look up this symbol
239 * in the kernel. If not found, we're done.
240 * If found, then find the "mod" info structure and call init_stubs().
241 */
242 p = namebuf;
243
244 while (*filenamep && *filenamep != '.')
245 *p++ = *filenamep++;
246
247 (void) strcpy(p, "_modinfo");
248
249 if ((mp = (struct mod_modinfo *)modgetsymvalue(namebuf, 1)) != 0)
250 return (init_stubs(modp, mp));
251 else
252 return (0);
253 }
254
255 static int
init_stubs(struct modctl * modp,struct mod_modinfo * mp)256 init_stubs(struct modctl *modp, struct mod_modinfo *mp)
257 {
258 struct mod_stub_info *sp;
259 int i;
260 ulong_t offset;
261 uintptr_t funcadr;
262 char *funcname;
263
264 modp->mod_modinfo = mp;
265
266 /*
267 * Fill in all stubs for this module. We can't be lazy, since
268 * some calls could come in from interrupt level, and we
269 * can't modlookup then (symbols may be paged out).
270 */
271 sp = mp->modm_stubs;
272 for (i = 0; sp->mods_func_adr; i++, sp++) {
273 funcname = modgetsymname(sp->mods_stub_adr, &offset);
274 if (funcname == NULL) {
275 printf("init_stubs: couldn't find symbol "
276 "in module %s\n", mp->modm_module_name);
277 return (EFAULT);
278 }
279 funcadr = kobj_lookup(modp->mod_mp, funcname);
280
281 if (kobj_addrcheck(modp->mod_mp, (caddr_t)funcadr)) {
282 printf("%s:%s() not defined properly\n",
283 mp->modm_module_name, funcname);
284 return (EFAULT);
285 }
286 sp->mods_func_adr = funcadr;
287 }
288 mp->mp = modp;
289 return (0);
290 }
291
292 /*
293 * modp->mod_modinfo has to be checked in these functions before
294 * mod_stub_info is accessed because it's not guranteed that all
295 * modules define mod_stub_info structures.
296 */
297 void
install_stubs(struct modctl * modp)298 install_stubs(struct modctl *modp)
299 {
300 struct mod_stub_info *stub;
301
302 if (modp->mod_modinfo) {
303 membar_producer();
304 for (stub = modp->mod_modinfo->modm_stubs;
305 stub->mods_func_adr; stub++) {
306 stub->mods_flag |= MODS_INSTALLED;
307 }
308 membar_producer();
309 }
310 }
311
312 void
uninstall_stubs(struct modctl * modp)313 uninstall_stubs(struct modctl *modp)
314 {
315 struct mod_stub_info *stub;
316
317 if (modp->mod_modinfo) {
318 membar_producer();
319 for (stub = modp->mod_modinfo->modm_stubs;
320 stub->mods_func_adr; stub++) {
321 stub->mods_flag &= ~MODS_INSTALLED;
322 }
323 membar_producer();
324 }
325 }
326
327 void
reset_stubs(struct modctl * modp)328 reset_stubs(struct modctl *modp)
329 {
330 struct mod_stub_info *stub;
331
332 if (modp->mod_modinfo) {
333 for (stub = modp->mod_modinfo->modm_stubs;
334 stub->mods_func_adr; stub++) {
335 if (stub->mods_flag & (MODS_WEAK | MODS_NOUNLOAD))
336 stub->mods_func_adr =
337 (uintptr_t)stub->mods_errfcn;
338 else
339 stub->mods_func_adr =
340 (uintptr_t)mod_hold_stub;
341 }
342 modp->mod_modinfo->mp = NULL;
343 }
344 }
345
346 struct modctl *
mod_getctl(struct modlinkage * modlp)347 mod_getctl(struct modlinkage *modlp)
348 {
349 struct modctl *modp;
350
351 mutex_enter(&mod_lock);
352 modp = &modules;
353 do {
354 if (modp->mod_linkage == modlp) {
355 mutex_exit(&mod_lock);
356 return (modp);
357 }
358 } while ((modp = modp->mod_next) != &modules);
359 mutex_exit(&mod_lock);
360 return (NULL);
361 }
362
363
364 /*
365 * Attach driver.conf info to devnames for a driver
366 */
367 struct par_list *
impl_make_parlist(major_t major)368 impl_make_parlist(major_t major)
369 {
370 int err;
371 struct par_list *pl = NULL, *tmp;
372 ddi_prop_t *props = NULL;
373 char *confname, *drvname;
374 struct devnames *dnp;
375
376 dnp = &devnamesp[major];
377
378 ASSERT(mutex_owned(&dnp->dn_lock));
379
380 /*
381 * If .conf file already parsed or driver removed, just return.
382 * May return NULL.
383 */
384 if (dnp->dn_flags & (DN_CONF_PARSED | DN_DRIVER_REMOVED))
385 return (dnp->dn_pl);
386
387 drvname = mod_major_to_name(major);
388 if (drvname == NULL)
389 return (NULL);
390
391 confname = kmem_alloc(MAXNAMELEN, KM_SLEEP);
392 (void) snprintf(confname, MAXNAMELEN, "drv/%s.conf", drvname);
393 err = hwc_parse(confname, &pl, &props);
394 kmem_free(confname, MAXNAMELEN);
395 if (err) /* file doesn't exist */
396 return (NULL);
397
398 /*
399 * If there are global properties, reference it from dnp.
400 */
401 if (props)
402 dnp->dn_global_prop_ptr = i_ddi_prop_list_create(props);
403
404 /*
405 * Hash specs to be looked up by nexus drivers
406 */
407 tmp = pl;
408 while (tmp) {
409 (void) hwc_hash(tmp->par_specs, major);
410 tmp = tmp->par_next;
411 }
412
413 if (!i_ddi_io_initialized()) {
414 if (i_ddi_prop_search(DDI_DEV_T_ANY, DDI_FORCEATTACH,
415 DDI_PROP_TYPE_INT, &props))
416 dnp->dn_flags |= DN_FORCE_ATTACH;
417 if (i_ddi_prop_search(DDI_DEV_T_ANY, DDI_OPEN_RETURNS_EINTR,
418 DDI_PROP_TYPE_INT, &props))
419 dnp->dn_flags |= DN_OPEN_RETURNS_EINTR;
420 if (i_ddi_prop_search(DDI_DEV_T_ANY, "scsi-size-clean",
421 DDI_PROP_TYPE_INT, &props))
422 dnp->dn_flags |= DN_SCSI_SIZE_CLEAN;
423 }
424
425 if (i_ddi_prop_search(DDI_DEV_T_ANY, DDI_VHCI_CLASS,
426 DDI_PROP_TYPE_STRING, &props))
427 dnp->dn_flags |= DN_PHCI_DRIVER;
428
429 if (i_ddi_prop_search(DDI_DEV_T_ANY, DDI_DEVID_REGISTRANT,
430 DDI_PROP_TYPE_INT, &props)) {
431 dnp->dn_flags |= DN_DEVID_REGISTRANT;
432 }
433
434 dnp->dn_flags |= DN_CONF_PARSED;
435 dnp->dn_pl = pl;
436 return (pl);
437 }
438
439 /*
440 * Destroy driver.conf info in devnames array for a driver
441 */
442 int
impl_free_parlist(major_t major)443 impl_free_parlist(major_t major)
444 {
445 struct par_list *pl;
446 struct devnames *dnp = &devnamesp[major];
447
448 /*
449 * Unref driver global property list. Don't destroy it
450 * because some instances may still be referencing it.
451 * The property list will be freed when the last ref
452 * goes away.
453 */
454 if (dnp->dn_global_prop_ptr) {
455 i_ddi_prop_list_rele(dnp->dn_global_prop_ptr, dnp);
456 dnp->dn_global_prop_ptr = NULL;
457 }
458
459 /*
460 * remove specs from hash table
461 */
462 for (pl = dnp->dn_pl; pl; pl = pl->par_next)
463 hwc_unhash(pl->par_specs);
464
465 impl_delete_par_list(dnp->dn_pl);
466 dnp->dn_pl = NULL;
467 dnp->dn_flags &= ~DN_CONF_PARSED;
468 return (0);
469 }
470
471 struct bind *mb_hashtab[MOD_BIND_HASHSIZE];
472 struct bind *sb_hashtab[MOD_BIND_HASHSIZE];
473
474 static int
nm_hash(const char * name)475 nm_hash(const char *name)
476 {
477 char c;
478 int hash = 0;
479
480 for (c = *name++; c; c = *name++)
481 hash ^= c;
482
483 return (hash & MOD_BIND_HASHMASK);
484 }
485
486 void
clear_binding_hash(struct bind ** bhash)487 clear_binding_hash(struct bind **bhash)
488 {
489 int i;
490 struct bind *bp, *bp1;
491
492 for (i = 0; i < MOD_BIND_HASHSIZE; i++) {
493 bp = bhash[i];
494 while (bp != NULL) {
495 kmem_free(bp->b_name, strlen(bp->b_name) + 1);
496 if (bp->b_bind_name) {
497 kmem_free(bp->b_bind_name,
498 strlen(bp->b_bind_name) + 1);
499 }
500 bp1 = bp;
501 bp = bp->b_next;
502 kmem_free(bp1, sizeof (struct bind));
503 }
504 bhash[i] = NULL;
505 }
506 }
507
508 /* Find an mbind by name match (caller can ask for deleted match) */
509 static struct bind *
find_mbind(const char * name,struct bind ** hashtab,int deleted)510 find_mbind(const char *name, struct bind **hashtab, int deleted)
511 {
512 struct bind *mb;
513
514 for (mb = hashtab[nm_hash(name)]; mb; mb = mb->b_next) {
515 if (deleted && (mb->b_num >= 0))
516 continue; /* skip active */
517 if (!deleted && (mb->b_num < 0))
518 continue; /* skip deleted */
519
520 /* return if name matches */
521 if (strcmp(name, mb->b_name) == 0) {
522 break;
523 }
524 }
525 return (mb);
526 }
527
528 /*
529 * Create an entry for the given (name, major, bind_name) tuple in the
530 * hash table supplied. Reject the attempt to do so if 'name' is already
531 * in the hash table.
532 *
533 * Does not provide synchronization, so use only during boot or with
534 * externally provided locking.
535 */
536 int
make_mbind(char * name,int num,char * bind_name,struct bind ** hashtab)537 make_mbind(char *name, int num, char *bind_name, struct bind **hashtab)
538 {
539 struct bind *mb;
540 struct bind **pmb;
541
542 ASSERT(hashtab != NULL);
543 ASSERT(num >= 0);
544
545 /* Fail if the key being added is already established */
546 if (find_mbind(name, hashtab, 0) != NULL)
547 return (-1);
548
549 /* Allocate new mbind */
550 mb = kmem_zalloc(sizeof (struct bind), KM_SLEEP);
551 mb->b_name = i_ddi_strdup(name, KM_SLEEP);
552 mb->b_num = num;
553 if (bind_name != NULL)
554 mb->b_bind_name = i_ddi_strdup(bind_name, KM_SLEEP);
555
556 /* Insert at head of hash */
557 pmb = &hashtab[nm_hash(name)];
558 mb->b_next = *pmb;
559 *pmb = mb;
560 return (0);
561 }
562
563 /*
564 * Delete a binding from a binding-hash. Since there is no locking we
565 * delete an mbind by making its b_num negative. We also support find_mbind
566 * of deleted entries, so we still need deleted items on the list.
567 */
568 void
delete_mbind(const char * name,struct bind ** hashtab)569 delete_mbind(const char *name, struct bind **hashtab)
570 {
571 struct bind *mb;
572
573 for (mb = hashtab[nm_hash(name)]; mb; mb = mb->b_next) {
574 if ((mb->b_num >= 0) && (strcmp(name, mb->b_name) == 0)) {
575 /* delete by making b_num negative */
576 if (moddebug & MODDEBUG_BINDING) {
577 cmn_err(CE_CONT, "mbind: %s %d deleted\n",
578 name, mb->b_num);
579 }
580 mb->b_num = -mb->b_num;
581 break;
582 }
583 }
584 }
585
586 /*
587 * Delete all items in an mbind associated with specified num.
588 * An example would be rem_drv deleting all aliases associated with a
589 * driver major number.
590 */
591 void
purge_mbind(int num,struct bind ** hashtab)592 purge_mbind(int num, struct bind **hashtab)
593 {
594 int i;
595 struct bind *mb;
596
597 /* search all hash lists for items that associated with 'num' */
598 for (i = 0; i < MOD_BIND_HASHSIZE; i++) {
599 for (mb = hashtab[i]; mb; mb = mb->b_next) {
600 if (mb->b_num == num) {
601 if (moddebug & MODDEBUG_BINDING)
602 cmn_err(CE_CONT,
603 "mbind: %s %d purged\n",
604 mb->b_name, num);
605 /* purge by changing the sign */
606 mb->b_num = -num;
607 }
608 }
609 }
610 }
611
612 major_t
mod_name_to_major(const char * name)613 mod_name_to_major(const char *name)
614 {
615 struct bind *mbind;
616 major_t maj;
617
618 /* Search for non-deleted match. */
619 if ((mbind = find_mbind(name, mb_hashtab, 0)) != NULL) {
620 if (moddebug & MODDEBUG_BINDING) {
621 if (find_mbind(name, mb_hashtab, 1))
622 cmn_err(CE_CONT,
623 "'%s' has deleted match too\n", name);
624 }
625 return ((major_t)mbind->b_num);
626 }
627
628 /*
629 * Search for deleted match: We may find that we have dependencies
630 * on drivers that have been deleted (but the old driver may still
631 * be bound to a node). These callers should be converted to use
632 * ddi_driver_major(i.e. devi_major).
633 */
634 if (moddebug & MODDEBUG_BINDING) {
635 if ((mbind = find_mbind(name, mb_hashtab, 1)) != NULL) {
636 maj = (major_t)(-(mbind->b_num));
637 cmn_err(CE_CONT, "Reference to deleted alias '%s' %d\n",
638 name, maj);
639 }
640 }
641
642 return (DDI_MAJOR_T_NONE);
643 }
644
645 char *
mod_major_to_name(major_t major)646 mod_major_to_name(major_t major)
647 {
648 if (!driver_installed(major))
649 return (NULL);
650 return ((&devnamesp[major])->dn_name);
651 }
652
653 /*
654 * Set up the devnames array. Error check for duplicate entries.
655 */
656 void
init_devnamesp(int size)657 init_devnamesp(int size)
658 {
659 int hshndx;
660 struct bind *bp;
661 static char dupwarn[] =
662 "!Device entry \"%s %d\" conflicts with previous entry \"%s %d\" "
663 "in /etc/name_to_major.";
664 static char badmaj[] = "The major number %u is invalid.";
665
666 ASSERT(size <= L_MAXMAJ32 && size > 0);
667
668 /*
669 * Allocate the devnames array. All mutexes and cv's will be
670 * automagically initialized.
671 */
672 devnamesp = kobj_zalloc(size * sizeof (struct devnames), KM_SLEEP);
673
674 /*
675 * Stick the contents of mb_hashtab into the devnames array. Warn if
676 * two hash entries correspond to the same major number, or if a
677 * major number is out of range.
678 */
679 for (hshndx = 0; hshndx < MOD_BIND_HASHSIZE; hshndx++) {
680 for (bp = mb_hashtab[hshndx]; bp; bp = bp->b_next) {
681 if (make_devname(bp->b_name,
682 (major_t)bp->b_num, 0) != 0) {
683 /*
684 * If there is not an entry at b_num already,
685 * then this must be a bad major number.
686 */
687 char *nm = mod_major_to_name(bp->b_num);
688 if (nm == NULL) {
689 cmn_err(CE_WARN, badmaj,
690 (uint_t)bp->b_num);
691 } else {
692 cmn_err(CE_WARN, dupwarn, bp->b_name,
693 bp->b_num, nm, bp->b_num);
694 }
695 }
696 }
697 }
698
699 /* Initialize hash table for hwc_spec's */
700 hwc_hash_init();
701 }
702
703 int
make_devname(const char * name,major_t major,int dn_flags)704 make_devname(const char *name, major_t major, int dn_flags)
705 {
706 struct devnames *dnp;
707 char *copy;
708
709 /*
710 * Until on-disk support for major nums > 14 bits arrives, fail
711 * any major numbers that are too big.
712 */
713 if (major > L_MAXMAJ32)
714 return (EINVAL);
715
716 dnp = &devnamesp[major];
717 LOCK_DEV_OPS(&dnp->dn_lock);
718 if (dnp->dn_name) {
719 if (strcmp(dnp->dn_name, name) != 0) {
720 /* Another driver already here */
721 UNLOCK_DEV_OPS(&dnp->dn_lock);
722 return (EINVAL);
723 }
724 /* Adding back a removed driver */
725 dnp->dn_flags &= ~DN_DRIVER_REMOVED;
726 dnp->dn_flags |= dn_flags;
727 UNLOCK_DEV_OPS(&dnp->dn_lock);
728 return (0);
729 }
730
731 /*
732 * Check if flag is taken by getudev()
733 */
734 if (dnp->dn_flags & DN_TAKEN_GETUDEV) {
735 UNLOCK_DEV_OPS(&dnp->dn_lock);
736 return (EINVAL);
737 }
738
739 copy = kmem_alloc(strlen(name) + 1, KM_SLEEP);
740 (void) strcpy(copy, name);
741
742 /* Make sure string is copied before setting dn_name */
743 membar_producer();
744 dnp->dn_name = copy;
745 dnp->dn_flags = dn_flags;
746 UNLOCK_DEV_OPS(&dnp->dn_lock);
747 return (0);
748 }
749
750 /*
751 * Set up the syscallnames array.
752 */
753 void
init_syscallnames(int size)754 init_syscallnames(int size)
755 {
756 int hshndx;
757 struct bind *bp;
758
759 syscallnames = kobj_zalloc(size * sizeof (char *), KM_SLEEP);
760
761 for (hshndx = 0; hshndx < MOD_BIND_HASHSIZE; hshndx++) {
762 for (bp = sb_hashtab[hshndx]; bp; bp = bp->b_next) {
763 if (bp->b_num < 0 || bp->b_num >= size) {
764 cmn_err(CE_WARN,
765 "!Couldn't add system call \"%s %d\". "
766 "Value out of range (0..%d) in "
767 "/etc/name_to_sysnum.",
768 bp->b_name, bp->b_num, size - 1);
769 continue;
770 }
771 make_syscallname(bp->b_name, bp->b_num);
772 }
773 }
774 }
775
776 static void
make_syscallname(const char * name,int sysno)777 make_syscallname(const char *name, int sysno)
778 {
779 char **cp = &syscallnames[sysno];
780
781 if (*cp != NULL) {
782 cmn_err(CE_WARN, "!Couldn't add system call \"%s %d\". "
783 "It conflicts with \"%s %d\" in /etc/name_to_sysnum.",
784 name, sysno, *cp, sysno);
785 return;
786 }
787 *cp = kmem_alloc(strlen(name) + 1, KM_SLEEP);
788 (void) strcpy(*cp, name);
789 }
790
791 /*
792 * Given a system call name, get its number.
793 */
794 int
mod_getsysnum(const char * name)795 mod_getsysnum(const char *name)
796 {
797 struct bind *mbind;
798
799 if ((mbind = find_mbind(name, sb_hashtab, 0)) != NULL)
800 return (mbind->b_num);
801
802 return (-1);
803 }
804
805 /*
806 * Given a system call number, get the system call name.
807 */
808 char *
mod_getsysname(int sysnum)809 mod_getsysname(int sysnum)
810 {
811 return (syscallnames[sysnum]);
812 }
813
814 /*
815 * Find the name of the module containing the specified pc.
816 * Returns the name on success, "<unknown>" on failure.
817 * No mod_lock locking is required because things are never deleted from
818 * the &modules list.
819 */
820 char *
mod_containing_pc(caddr_t pc)821 mod_containing_pc(caddr_t pc)
822 {
823 struct modctl *mcp = &modules;
824
825 do {
826 if (mcp->mod_mp != NULL &&
827 (size_t)pc - (size_t)mcp->mod_text < mcp->mod_text_size)
828 return (mcp->mod_modname);
829 } while ((mcp = mcp->mod_next) != &modules);
830 return ("<unknown>");
831 }
832
833 /*
834 * Hash tables for hwc_spec
835 *
836 * The purpose of these hash tables are to allow the framework to discover
837 * all possible .conf children for a given nexus. There are two hash tables.
838 * One is hashed based on parent name, the on the class name. Each
839 * driver.conf file translates to a list of hwc_spec's. Adding and
840 * removing the entire list is an atomic operation, protected by
841 * the hwc_hash_lock.
842 *
843 * What we get from all the hashing is the function hwc_get_child_spec().
844 */
845 #define HWC_SPEC_HASHSIZE (1 << 6) /* 64 */
846
847 static mod_hash_t *hwc_par_hash; /* hash by parent name */
848 static mod_hash_t *hwc_class_hash; /* hash by class name */
849 static kmutex_t hwc_hash_lock; /* lock protecting hwc hashes */
850
851 /*
852 * Initialize hash tables for parent and class specs
853 */
854 static void
hwc_hash_init()855 hwc_hash_init()
856 {
857 hwc_par_hash = mod_hash_create_strhash("hwc parent spec hash",
858 HWC_SPEC_HASHSIZE, mod_hash_null_valdtor);
859 hwc_class_hash = mod_hash_create_strhash("hwc class spec hash",
860 HWC_SPEC_HASHSIZE, mod_hash_null_valdtor);
861 }
862
863 /*
864 * Insert a spec into hash table. hwc_hash_lock must be held
865 */
866 static void
hwc_hash_insert(struct hwc_spec * spec,const char * name,mod_hash_t * hash)867 hwc_hash_insert(struct hwc_spec *spec, const char *name, mod_hash_t *hash)
868 {
869 mod_hash_key_t key;
870 struct hwc_spec *entry = NULL;
871
872 ASSERT(name != NULL);
873
874 if (mod_hash_find(hash, (mod_hash_key_t)name,
875 (mod_hash_val_t)&entry) != 0) {
876 /* Name doesn't exist, insert a new key */
877 key = kmem_alloc(strlen(name) + 1, KM_SLEEP);
878 (void) strcpy((char *)key, name);
879 if (mod_hash_insert(hash, key, (mod_hash_val_t)spec) != 0) {
880 kmem_free(key, strlen(name) + 1);
881 cmn_err(CE_WARN, "hwc hash state inconsistent");
882 }
883 return;
884 }
885
886 /*
887 * Name is already present, append spec to the list.
888 * This is the case when driver.conf specifies multiple
889 * nodes under a single parent or class.
890 */
891 while (entry->hwc_hash_next)
892 entry = entry->hwc_hash_next;
893 entry->hwc_hash_next = spec;
894 }
895
896 /*
897 * Remove a spec entry from spec hash table, the spec itself is
898 * destroyed external to this function.
899 */
900 static void
hwc_hash_remove(struct hwc_spec * spec,const char * name,mod_hash_t * hash)901 hwc_hash_remove(struct hwc_spec *spec, const char *name, mod_hash_t *hash)
902 {
903 char *key;
904 struct hwc_spec *entry;
905
906 ASSERT(name != NULL);
907
908 if (mod_hash_find(hash, (mod_hash_key_t)name,
909 (mod_hash_val_t)&entry) != 0) {
910 return; /* name not found in hash */
911 }
912
913 /*
914 * If the head is the spec to be removed, either destroy the
915 * entry or replace it with the remaining list.
916 */
917 if (entry == spec) {
918 if (spec->hwc_hash_next == NULL) {
919 (void) mod_hash_destroy(hash, (mod_hash_key_t)name);
920 return;
921 }
922 key = kmem_alloc(strlen(name) + 1, KM_SLEEP);
923 (void) strcpy(key, name);
924 (void) mod_hash_replace(hash, (mod_hash_key_t)key,
925 (mod_hash_val_t)spec->hwc_hash_next);
926 spec->hwc_hash_next = NULL;
927 return;
928 }
929
930 /*
931 * If the head is not the one, look for the spec in the
932 * hwc_hash_next linkage.
933 */
934 while (entry->hwc_hash_next && (entry->hwc_hash_next != spec))
935 entry = entry->hwc_hash_next;
936
937 if (entry->hwc_hash_next) {
938 entry->hwc_hash_next = spec->hwc_hash_next;
939 spec->hwc_hash_next = NULL;
940 }
941 }
942
943 /*
944 * Hash a list of specs based on either parent name or class name
945 */
946 static void
hwc_hash(struct hwc_spec * spec_list,major_t major)947 hwc_hash(struct hwc_spec *spec_list, major_t major)
948 {
949 struct hwc_spec *spec = spec_list;
950
951 mutex_enter(&hwc_hash_lock);
952 while (spec) {
953 /* Put driver major here so parent can find it */
954 spec->hwc_major = major;
955
956 if (spec->hwc_parent_name != NULL) {
957 hwc_hash_insert(spec, spec->hwc_parent_name,
958 hwc_par_hash);
959 } else if (spec->hwc_class_name != NULL) {
960 hwc_hash_insert(spec, spec->hwc_class_name,
961 hwc_class_hash);
962 } else {
963 cmn_err(CE_WARN,
964 "hwc_hash: No class or parent specified");
965 }
966 spec = spec->hwc_next;
967 }
968 mutex_exit(&hwc_hash_lock);
969 }
970
971 /*
972 * Remove a list of specs from hash tables. Don't destroy the specs yet.
973 */
974 static void
hwc_unhash(struct hwc_spec * spec_list)975 hwc_unhash(struct hwc_spec *spec_list)
976 {
977 struct hwc_spec *spec = spec_list;
978
979 mutex_enter(&hwc_hash_lock);
980 while (spec) {
981 if (spec->hwc_parent_name != NULL) {
982 hwc_hash_remove(spec, spec->hwc_parent_name,
983 hwc_par_hash);
984 } else if (spec->hwc_class_name != NULL) {
985 hwc_hash_remove(spec, spec->hwc_class_name,
986 hwc_class_hash);
987 } else {
988 cmn_err(CE_WARN,
989 "hwc_unhash: No class or parent specified");
990 }
991 spec = spec->hwc_next;
992 }
993 mutex_exit(&hwc_hash_lock);
994 }
995
996 /*
997 * Make a copy of specs in a hash entry and add to the end of listp.
998 * Called by nexus to locate a list of child specs.
999 *
1000 * entry is a list of hwc_spec chained together with hwc_hash_next.
1001 * listp points to list chained together with hwc_next.
1002 */
1003 static void
hwc_spec_add(struct hwc_spec ** listp,struct hwc_spec * entry,major_t match_major)1004 hwc_spec_add(struct hwc_spec **listp, struct hwc_spec *entry,
1005 major_t match_major)
1006 {
1007 /* Find the tail of the list */
1008 while (*listp)
1009 listp = &(*listp)->hwc_next;
1010
1011 while (entry) {
1012 struct hwc_spec *spec;
1013
1014 if ((match_major != DDI_MAJOR_T_NONE) &&
1015 (match_major != entry->hwc_major)) {
1016 entry = entry->hwc_hash_next;
1017 continue;
1018 }
1019
1020 /*
1021 * Allocate spec and copy the content of entry.
1022 * No need to copy class/parent name since caller
1023 * already knows the parent dip.
1024 */
1025 spec = kmem_zalloc(sizeof (*spec), KM_SLEEP);
1026 spec->hwc_devi_name = i_ddi_strdup(
1027 entry->hwc_devi_name, KM_SLEEP);
1028 spec->hwc_major = entry->hwc_major;
1029 spec->hwc_devi_sys_prop_ptr = i_ddi_prop_list_dup(
1030 entry->hwc_devi_sys_prop_ptr, KM_SLEEP);
1031
1032 *listp = spec;
1033 listp = &spec->hwc_next;
1034 entry = entry->hwc_hash_next;
1035 }
1036 }
1037
1038 /*
1039 * Given a dip, find the list of child .conf specs from most specific
1040 * (parent pathname) to least specific (class name).
1041 *
1042 * This function allows top-down loading to be implemented without
1043 * changing the format of driver.conf file.
1044 */
1045 struct hwc_spec *
hwc_get_child_spec(dev_info_t * dip,major_t match_major)1046 hwc_get_child_spec(dev_info_t *dip, major_t match_major)
1047 {
1048 extern char *i_ddi_parname(dev_info_t *, char *);
1049 extern int i_ddi_get_exported_classes(dev_info_t *, char ***);
1050 extern void i_ddi_free_exported_classes(char **, int);
1051
1052 int i, nclass;
1053 char **classes;
1054 struct hwc_spec *list = NULL;
1055 mod_hash_val_t val;
1056 char *parname, *parname_buf;
1057 char *deviname, *deviname_buf;
1058 char *pathname, *pathname_buf;
1059 char *bindname;
1060 char *drvname;
1061
1062 pathname_buf = kmem_alloc(3 * MAXPATHLEN, KM_SLEEP);
1063 deviname_buf = pathname_buf + MAXPATHLEN;
1064 parname_buf = pathname_buf + (2 * MAXPATHLEN);
1065
1066 mutex_enter(&hwc_hash_lock);
1067
1068 /*
1069 * Lookup based on full path.
1070 * In the case of root node, ddi_pathname would return
1071 * null string so just skip calling it.
1072 * As the pathname always begins with /, no simpler
1073 * name can duplicate it.
1074 */
1075 pathname = (dip == ddi_root_node()) ? "/" :
1076 ddi_pathname(dip, pathname_buf);
1077 ASSERT(pathname != NULL);
1078 ASSERT(*pathname == '/');
1079
1080 if (mod_hash_find(hwc_par_hash, (mod_hash_key_t)pathname, &val) == 0) {
1081 hwc_spec_add(&list, (struct hwc_spec *)val, match_major);
1082 }
1083
1084 /*
1085 * Lookup nodename@address.
1086 * Note deviname cannot match pathname.
1087 */
1088 deviname = ddi_deviname(dip, deviname_buf);
1089 if (*deviname != '\0') {
1090 /*
1091 * Skip leading / returned by ddi_deviname.
1092 */
1093 ASSERT(*deviname == '/');
1094 deviname++;
1095 if ((*deviname != '\0') && (mod_hash_find(hwc_par_hash,
1096 (mod_hash_key_t)deviname, &val) == 0))
1097 hwc_spec_add(&list,
1098 (struct hwc_spec *)val, match_major);
1099 }
1100
1101 /*
1102 * Lookup bindingname@address.
1103 * Take care not to perform duplicate lookups.
1104 */
1105 parname = i_ddi_parname(dip, parname_buf);
1106 if (*parname != '\0') {
1107 ASSERT(*parname != '/');
1108 if ((strcmp(parname, deviname) != 0) &&
1109 (mod_hash_find(hwc_par_hash,
1110 (mod_hash_key_t)parname, &val) == 0)) {
1111 hwc_spec_add(&list,
1112 (struct hwc_spec *)val, match_major);
1113 }
1114 }
1115
1116 /*
1117 * Lookup driver binding name
1118 */
1119 bindname = ddi_binding_name(dip);
1120 ASSERT(*bindname != '/');
1121 if ((strcmp(bindname, parname) != 0) &&
1122 (strcmp(bindname, deviname) != 0) &&
1123 (mod_hash_find(hwc_par_hash, (mod_hash_key_t)bindname, &val) == 0))
1124 hwc_spec_add(&list, (struct hwc_spec *)val, match_major);
1125
1126 /*
1127 * Lookup driver name
1128 */
1129 drvname = (char *)ddi_driver_name(dip);
1130 ASSERT(*drvname != '/');
1131 if ((strcmp(drvname, bindname) != 0) &&
1132 (strcmp(drvname, parname) != 0) &&
1133 (strcmp(drvname, deviname) != 0) &&
1134 (mod_hash_find(hwc_par_hash, (mod_hash_key_t)drvname, &val) == 0))
1135 hwc_spec_add(&list, (struct hwc_spec *)val, match_major);
1136
1137 kmem_free(pathname_buf, 3 * MAXPATHLEN);
1138
1139 /*
1140 * Lookup classes exported by this node and lookup the
1141 * class hash table for all .conf specs
1142 */
1143 nclass = i_ddi_get_exported_classes(dip, &classes);
1144 for (i = 0; i < nclass; i++) {
1145 if (mod_hash_find(hwc_class_hash, (mod_hash_key_t)classes[i],
1146 &val) == 0)
1147 hwc_spec_add(&list, (struct hwc_spec *)val,
1148 match_major);
1149 }
1150 i_ddi_free_exported_classes(classes, nclass);
1151
1152 mutex_exit(&hwc_hash_lock);
1153 return (list);
1154 }
1155