1/*-
2 * Copyright (c) 1999-2002 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 1999-2002 Poul-Henning Kamp
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
|
28__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 130585 2004-06-16 09:47:26Z phk $");
| 28__FBSDID("$FreeBSD: head/sys/kern/kern_conf.c 130640 2004-06-17 17:16:53Z phk $");
|
29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/bio.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36#include <sys/sysctl.h>
37#include <sys/module.h>
38#include <sys/malloc.h>
39#include <sys/conf.h>
40#include <sys/vnode.h>
41#include <sys/queue.h>
42#include <sys/poll.h>
43#include <sys/ctype.h>
44#include <sys/tty.h>
45#include <machine/stdarg.h>
46
47static MALLOC_DEFINE(M_DEVT, "struct cdev *", "struct cdev *storage");
48
49/* Built at compile time from sys/conf/majors */
50extern unsigned char reserved_majors[256];
51
52/*
53 * This is the number of hash-buckets. Experiements with 'real-life'
| 29
30#include <sys/param.h>
31#include <sys/kernel.h>
32#include <sys/systm.h>
33#include <sys/bio.h>
34#include <sys/lock.h>
35#include <sys/mutex.h>
36#include <sys/sysctl.h>
37#include <sys/module.h>
38#include <sys/malloc.h>
39#include <sys/conf.h>
40#include <sys/vnode.h>
41#include <sys/queue.h>
42#include <sys/poll.h>
43#include <sys/ctype.h>
44#include <sys/tty.h>
45#include <machine/stdarg.h>
46
47static MALLOC_DEFINE(M_DEVT, "struct cdev *", "struct cdev *storage");
48
49/* Built at compile time from sys/conf/majors */
50extern unsigned char reserved_majors[256];
51
52/*
53 * This is the number of hash-buckets. Experiements with 'real-life'
|
54 * udev_t's show that a prime halfway between two powers of two works
| 54 * dev_t's show that a prime halfway between two powers of two works
|
55 * best.
56 */
57#define DEVT_HASH 83
58
59/* The number of struct cdev *'s we can create before malloc(9) kick in. */
60#define DEVT_STASH 50
61
62static struct cdev devt_stash[DEVT_STASH];
63
64static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
65
66static LIST_HEAD(, cdev) dev_free;
67
68static int free_devt;
69SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
70
71static struct mtx devmtx;
72static void freedev(struct cdev *dev);
| 55 * best.
56 */
57#define DEVT_HASH 83
58
59/* The number of struct cdev *'s we can create before malloc(9) kick in. */
60#define DEVT_STASH 50
61
62static struct cdev devt_stash[DEVT_STASH];
63
64static LIST_HEAD(, cdev) dev_hash[DEVT_HASH];
65
66static LIST_HEAD(, cdev) dev_free;
67
68static int free_devt;
69SYSCTL_INT(_debug, OID_AUTO, free_devt, CTLFLAG_RW, &free_devt, 0, "");
70
71static struct mtx devmtx;
72static void freedev(struct cdev *dev);
|
| 73static struct cdev *newdev(int x, int y);
|
73
| 74
|
| 75
|
74static void
75devlock(void)
76{
77 if (!mtx_initialized(&devmtx))
78 mtx_init(&devmtx, "struct cdev *", NULL, MTX_DEF);
79 mtx_lock(&devmtx);
80}
81
82static void
83devunlock(void)
84{
85 mtx_unlock(&devmtx);
86}
87
88void
89dev_ref(struct cdev *dev)
90{
91 devlock();
92 dev->si_refcount++;
93 devunlock();
94}
95
96void
97dev_rel(struct cdev *dev)
98{
99 devlock();
100 dev->si_refcount--;
101 KASSERT(dev->si_refcount >= 0,
102 ("dev_rel(%s) gave negative count", devtoname(dev)));
103 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
104 LIST_REMOVE(dev, si_list);
105 freedev(dev);
106 }
107 devunlock();
108}
109
110void
111cdevsw_ref(struct cdevsw *csw)
112{
113 devlock();
114 csw->d_refcount++;
115 devunlock();
116}
117
118void
119cdevsw_rel(struct cdevsw *csw)
120{
121 devlock();
122 csw->d_refcount--;
123 KASSERT(csw->d_refcount >= 0,
124 ("cdevsw_vrel(%s) gave negative count", csw->d_name));
125 devunlock();
126}
127
| 76static void
77devlock(void)
78{
79 if (!mtx_initialized(&devmtx))
80 mtx_init(&devmtx, "struct cdev *", NULL, MTX_DEF);
81 mtx_lock(&devmtx);
82}
83
84static void
85devunlock(void)
86{
87 mtx_unlock(&devmtx);
88}
89
90void
91dev_ref(struct cdev *dev)
92{
93 devlock();
94 dev->si_refcount++;
95 devunlock();
96}
97
98void
99dev_rel(struct cdev *dev)
100{
101 devlock();
102 dev->si_refcount--;
103 KASSERT(dev->si_refcount >= 0,
104 ("dev_rel(%s) gave negative count", devtoname(dev)));
105 if (dev->si_devsw == NULL && dev->si_refcount == 0) {
106 LIST_REMOVE(dev, si_list);
107 freedev(dev);
108 }
109 devunlock();
110}
111
112void
113cdevsw_ref(struct cdevsw *csw)
114{
115 devlock();
116 csw->d_refcount++;
117 devunlock();
118}
119
120void
121cdevsw_rel(struct cdevsw *csw)
122{
123 devlock();
124 csw->d_refcount--;
125 KASSERT(csw->d_refcount >= 0,
126 ("cdevsw_vrel(%s) gave negative count", csw->d_name));
127 devunlock();
128}
129
|
128static struct cdev *makedev(int x, int y);
129
| |
130int
131nullop(void)
132{
133
134 return (0);
135}
136
137int
138eopnotsupp(void)
139{
140
141 return (EOPNOTSUPP);
142}
143
144static int
145enxio(void)
146{
147 return (ENXIO);
148}
149
150static int
151enodev(void)
152{
153 return (ENODEV);
154}
155
156/* Define a dead_cdevsw for use when devices leave unexpectedly. */
157
158#define dead_open (d_open_t *)enxio
159#define dead_close (d_close_t *)enxio
160#define dead_read (d_read_t *)enxio
161#define dead_write (d_write_t *)enxio
162#define dead_ioctl (d_ioctl_t *)enxio
163#define dead_poll (d_poll_t *)enodev
164#define dead_mmap (d_mmap_t *)enodev
165
166static void
167dead_strategy(struct bio *bp)
168{
169
170 biofinish(bp, NULL, ENXIO);
171}
172
173#define dead_dump (dumper_t *)enxio
174#define dead_kqfilter (d_kqfilter_t *)enxio
175
176static struct cdevsw dead_cdevsw = {
177 .d_version = D_VERSION,
178 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
179 .d_open = dead_open,
180 .d_close = dead_close,
181 .d_read = dead_read,
182 .d_write = dead_write,
183 .d_ioctl = dead_ioctl,
184 .d_poll = dead_poll,
185 .d_mmap = dead_mmap,
186 .d_strategy = dead_strategy,
187 .d_name = "dead",
188 .d_maj = 255,
189 .d_dump = dead_dump,
190 .d_kqfilter = dead_kqfilter
191};
192
193/* Default methods if driver does not specify method */
194
195#define null_open (d_open_t *)nullop
196#define null_close (d_close_t *)nullop
197#define no_read (d_read_t *)enodev
198#define no_write (d_write_t *)enodev
199#define no_ioctl (d_ioctl_t *)enodev
200#define no_mmap (d_mmap_t *)enodev
201
202static int
203no_kqfilter(struct cdev *dev __unused, struct knote *kn __unused)
204{
205
206 return (1);
207}
208
209static void
210no_strategy(struct bio *bp)
211{
212
213 biofinish(bp, NULL, ENODEV);
214}
215
216static int
217no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
218{
219 /*
220 * Return true for read/write. If the user asked for something
221 * special, return POLLNVAL, so that clients have a way of
222 * determining reliably whether or not the extended
223 * functionality is present without hard-coding knowledge
224 * of specific filesystem implementations.
225 * Stay in sync with vop_nopoll().
226 */
227 if (events & ~POLLSTANDARD)
228 return (POLLNVAL);
229
230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
231}
232
233#define no_dump (dumper_t *)enodev
234
235struct cdevsw *
236devsw(struct cdev *dev)
237{
238 if (dev->si_devsw != NULL)
239 return (dev->si_devsw);
240 return (&dead_cdevsw);
241}
242
243/*
244 * struct cdev *and u_dev_t primitives
245 */
246
247int
248major(struct cdev *x)
249{
| 130int
131nullop(void)
132{
133
134 return (0);
135}
136
137int
138eopnotsupp(void)
139{
140
141 return (EOPNOTSUPP);
142}
143
144static int
145enxio(void)
146{
147 return (ENXIO);
148}
149
150static int
151enodev(void)
152{
153 return (ENODEV);
154}
155
156/* Define a dead_cdevsw for use when devices leave unexpectedly. */
157
158#define dead_open (d_open_t *)enxio
159#define dead_close (d_close_t *)enxio
160#define dead_read (d_read_t *)enxio
161#define dead_write (d_write_t *)enxio
162#define dead_ioctl (d_ioctl_t *)enxio
163#define dead_poll (d_poll_t *)enodev
164#define dead_mmap (d_mmap_t *)enodev
165
166static void
167dead_strategy(struct bio *bp)
168{
169
170 biofinish(bp, NULL, ENXIO);
171}
172
173#define dead_dump (dumper_t *)enxio
174#define dead_kqfilter (d_kqfilter_t *)enxio
175
176static struct cdevsw dead_cdevsw = {
177 .d_version = D_VERSION,
178 .d_flags = D_NEEDGIANT, /* XXX: does dead_strategy need this ? */
179 .d_open = dead_open,
180 .d_close = dead_close,
181 .d_read = dead_read,
182 .d_write = dead_write,
183 .d_ioctl = dead_ioctl,
184 .d_poll = dead_poll,
185 .d_mmap = dead_mmap,
186 .d_strategy = dead_strategy,
187 .d_name = "dead",
188 .d_maj = 255,
189 .d_dump = dead_dump,
190 .d_kqfilter = dead_kqfilter
191};
192
193/* Default methods if driver does not specify method */
194
195#define null_open (d_open_t *)nullop
196#define null_close (d_close_t *)nullop
197#define no_read (d_read_t *)enodev
198#define no_write (d_write_t *)enodev
199#define no_ioctl (d_ioctl_t *)enodev
200#define no_mmap (d_mmap_t *)enodev
201
202static int
203no_kqfilter(struct cdev *dev __unused, struct knote *kn __unused)
204{
205
206 return (1);
207}
208
209static void
210no_strategy(struct bio *bp)
211{
212
213 biofinish(bp, NULL, ENODEV);
214}
215
216static int
217no_poll(struct cdev *dev __unused, int events, struct thread *td __unused)
218{
219 /*
220 * Return true for read/write. If the user asked for something
221 * special, return POLLNVAL, so that clients have a way of
222 * determining reliably whether or not the extended
223 * functionality is present without hard-coding knowledge
224 * of specific filesystem implementations.
225 * Stay in sync with vop_nopoll().
226 */
227 if (events & ~POLLSTANDARD)
228 return (POLLNVAL);
229
230 return (events & (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM));
231}
232
233#define no_dump (dumper_t *)enodev
234
235struct cdevsw *
236devsw(struct cdev *dev)
237{
238 if (dev->si_devsw != NULL)
239 return (dev->si_devsw);
240 return (&dead_cdevsw);
241}
242
243/*
244 * struct cdev *and u_dev_t primitives
245 */
246
247int
248major(struct cdev *x)
249{
|
250 if (x == NODEV)
251 return NOUDEV;
| 250 if (x == NULL)
251 return NODEV;
|
252 return((x->si_udev >> 8) & 0xff);
253}
254
255int
256minor(struct cdev *x)
257{
| 252 return((x->si_udev >> 8) & 0xff);
253}
254
255int
256minor(struct cdev *x)
257{
|
258 if (x == NODEV)
259 return NOUDEV;
| 258 if (x == NULL)
259 return NODEV;
|
260 return(x->si_udev & 0xffff00ff);
261}
262
263int
264dev2unit(struct cdev *x)
265{
266 int i;
267
| 260 return(x->si_udev & 0xffff00ff);
261}
262
263int
264dev2unit(struct cdev *x)
265{
266 int i;
267
|
268 if (x == NODEV)
269 return NOUDEV;
| 268 if (x == NULL)
269 return NODEV;
|
270 i = minor(x);
271 return ((i & 0xff) | (i >> 8));
272}
273
274int
275unit2minor(int unit)
276{
277
278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
279 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
280}
281
282static struct cdev *
283allocdev(void)
284{
285 static int stashed;
286 struct cdev *si;
287
288 if (LIST_FIRST(&dev_free)) {
289 si = LIST_FIRST(&dev_free);
290 LIST_REMOVE(si, si_hash);
291 } else if (stashed >= DEVT_STASH) {
292 MALLOC(si, struct cdev *, sizeof(*si), M_DEVT,
293 M_USE_RESERVE | M_ZERO | M_WAITOK);
294 } else {
295 si = devt_stash + stashed++;
296 bzero(si, sizeof *si);
297 si->si_flags |= SI_STASHED;
298 }
299 si->__si_namebuf[0] = '\0';
300 si->si_name = si->__si_namebuf;
301 LIST_INIT(&si->si_children);
302 TAILQ_INIT(&si->si_snapshots);
303 return (si);
304}
305
306static struct cdev *
| 270 i = minor(x);
271 return ((i & 0xff) | (i >> 8));
272}
273
274int
275unit2minor(int unit)
276{
277
278 KASSERT(unit <= 0xffffff, ("Invalid unit (%d) in unit2minor", unit));
279 return ((unit & 0xff) | ((unit << 8) & ~0xffff));
280}
281
282static struct cdev *
283allocdev(void)
284{
285 static int stashed;
286 struct cdev *si;
287
288 if (LIST_FIRST(&dev_free)) {
289 si = LIST_FIRST(&dev_free);
290 LIST_REMOVE(si, si_hash);
291 } else if (stashed >= DEVT_STASH) {
292 MALLOC(si, struct cdev *, sizeof(*si), M_DEVT,
293 M_USE_RESERVE | M_ZERO | M_WAITOK);
294 } else {
295 si = devt_stash + stashed++;
296 bzero(si, sizeof *si);
297 si->si_flags |= SI_STASHED;
298 }
299 si->__si_namebuf[0] = '\0';
300 si->si_name = si->__si_namebuf;
301 LIST_INIT(&si->si_children);
302 TAILQ_INIT(&si->si_snapshots);
303 return (si);
304}
305
306static struct cdev *
|
307makedev(int x, int y)
| 307newdev(int x, int y)
|
308{
309 struct cdev *si;
| 308{
309 struct cdev *si;
|
310 udev_t udev;
| 310 dev_t udev;
|
311 int hash;
312
| 311 int hash;
312
|
313 if (x == umajor(NOUDEV) && y == uminor(NOUDEV))
314 panic("makedev of NOUDEV");
| 313 if (x == umajor(NODEV) && y == uminor(NODEV))
314 panic("newdev of NODEV");
|
315 udev = (x << 8) | y;
316 hash = udev % DEVT_HASH;
317 LIST_FOREACH(si, &dev_hash[hash], si_hash) {
318 if (si->si_udev == udev)
319 return (si);
320 }
321 si = allocdev();
322 si->si_udev = udev;
323 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
324 return (si);
325}
326
327static void
328freedev(struct cdev *dev)
329{
330
331 if (dev->si_flags & SI_STASHED) {
332 bzero(dev, sizeof(*dev));
333 dev->si_flags |= SI_STASHED;
334 LIST_INSERT_HEAD(&dev_free, dev, si_hash);
335 } else {
336 FREE(dev, M_DEVT);
337 }
338}
339
| 315 udev = (x << 8) | y;
316 hash = udev % DEVT_HASH;
317 LIST_FOREACH(si, &dev_hash[hash], si_hash) {
318 if (si->si_udev == udev)
319 return (si);
320 }
321 si = allocdev();
322 si->si_udev = udev;
323 LIST_INSERT_HEAD(&dev_hash[hash], si, si_hash);
324 return (si);
325}
326
327static void
328freedev(struct cdev *dev)
329{
330
331 if (dev->si_flags & SI_STASHED) {
332 bzero(dev, sizeof(*dev));
333 dev->si_flags |= SI_STASHED;
334 LIST_INSERT_HEAD(&dev_free, dev, si_hash);
335 } else {
336 FREE(dev, M_DEVT);
337 }
338}
339
|
340udev_t
| 340dev_t
|
341dev2udev(struct cdev *x)
342{
| 341dev2udev(struct cdev *x)
342{
|
343 if (x == NODEV)
344 return (NOUDEV);
| 343 if (x == NULL)
344 return (NODEV);
|
345 return (x->si_udev);
346}
347
348struct cdev *
| 345 return (x->si_udev);
346}
347
348struct cdev *
|
349udev2dev(udev_t udev)
| 349findcdev(dev_t udev)
|
350{
351 struct cdev *si;
352 int hash;
353
| 350{
351 struct cdev *si;
352 int hash;
353
|
354 if (udev == NOUDEV)
355 return (NODEV);
| 354 if (udev == NODEV)
355 return (NULL);
|
356 hash = udev % DEVT_HASH;
357 LIST_FOREACH(si, &dev_hash[hash], si_hash) {
358 if (si->si_udev == udev)
359 return (si);
360 }
| 356 hash = udev % DEVT_HASH;
357 LIST_FOREACH(si, &dev_hash[hash], si_hash) {
358 if (si->si_udev == udev)
359 return (si);
360 }
|
361 return (NODEV);
| 361 return (NULL);
|
362}
363
364int
| 362}
363
364int
|
365uminor(udev_t dev)
| 365uminor(dev_t dev)
|
366{
367 return (dev & 0xffff00ff);
368}
369
370int
| 366{
367 return (dev & 0xffff00ff);
368}
369
370int
|
371umajor(udev_t dev)
| 371umajor(dev_t dev)
|
372{
373 return ((dev & 0xff00) >> 8);
374}
375
| 372{
373 return ((dev & 0xff00) >> 8);
374}
375
|
376udev_t
377makeudev(int x, int y)
378{
379 return ((x << 8) | y);
380}
381
| |
382static void
383find_major(struct cdevsw *devsw)
384{
385 int i;
386
387 for (i = NUMCDEVSW - 1; i > 0; i--)
388 if (reserved_majors[i] != i)
389 break;
390 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name));
391 devsw->d_maj = i;
392 reserved_majors[i] = i;
393 devsw->d_flags |= D_ALLOCMAJ;
394}
395
396static void
397fini_cdevsw(struct cdevsw *devsw)
398{
399 if (devsw->d_flags & D_ALLOCMAJ) {
400 reserved_majors[devsw->d_maj] = 0;
401 devsw->d_maj = MAJOR_AUTO;
402 devsw->d_flags &= ~D_ALLOCMAJ;
403 } else if (devsw->d_maj == 0)
404 devsw->d_maj = 256;
405 devsw->d_flags &= ~D_INIT;
406}
407
408static void
409prep_cdevsw(struct cdevsw *devsw)
410{
411
412 devlock();
413
414 if (devsw->d_version != D_VERSION_00) {
415 printf(
416 "WARNING: Device driver \"%s\" has wrong version %s\n",
417 devsw->d_name, "and is disabled. Recompile KLD module.");
418 devsw->d_open = dead_open;
419 devsw->d_close = dead_close;
420 devsw->d_read = dead_read;
421 devsw->d_write = dead_write;
422 devsw->d_ioctl = dead_ioctl;
423 devsw->d_poll = dead_poll;
424 devsw->d_mmap = dead_mmap;
425 devsw->d_strategy = dead_strategy;
426 devsw->d_dump = dead_dump;
427 devsw->d_kqfilter = dead_kqfilter;
428 }
429
430 if (devsw->d_flags & D_TTY) {
431 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl;
432 if (devsw->d_read == NULL) devsw->d_read = ttyread;
433 if (devsw->d_write == NULL) devsw->d_write = ttywrite;
434 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
435 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
436 }
437
438 if (devsw->d_open == NULL) devsw->d_open = null_open;
439 if (devsw->d_close == NULL) devsw->d_close = null_close;
440 if (devsw->d_read == NULL) devsw->d_read = no_read;
441 if (devsw->d_write == NULL) devsw->d_write = no_write;
442 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl;
443 if (devsw->d_poll == NULL) devsw->d_poll = no_poll;
444 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap;
445 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy;
446 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
447 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter;
448
449 LIST_INIT(&devsw->d_devs);
450
451 devsw->d_flags |= D_INIT;
452
453 if (devsw->d_maj == MAJOR_AUTO) {
454 find_major(devsw);
455 } else {
456 if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */
457 devsw->d_maj = 0;
458 KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256,
459 ("Invalid major (%d) in make_dev", devsw->d_maj));
460 if (reserved_majors[devsw->d_maj] != devsw->d_maj) {
461 printf("WARNING: driver \"%s\" used %s %d\n",
462 devsw->d_name, "unreserved major device number",
463 devsw->d_maj);
464 reserved_majors[devsw->d_maj] = devsw->d_maj;
465 }
466 }
467 devunlock();
468}
469
470struct cdev *
471make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
472{
473 struct cdev *dev;
474 va_list ap;
475 int i;
476
477 KASSERT((minornr & ~0xffff00ff) == 0,
478 ("Invalid minor (0x%x) in make_dev", minornr));
479
480 if (!(devsw->d_flags & D_INIT))
481 prep_cdevsw(devsw);
| 376static void
377find_major(struct cdevsw *devsw)
378{
379 int i;
380
381 for (i = NUMCDEVSW - 1; i > 0; i--)
382 if (reserved_majors[i] != i)
383 break;
384 KASSERT(i > 0, ("Out of major numbers (%s)", devsw->d_name));
385 devsw->d_maj = i;
386 reserved_majors[i] = i;
387 devsw->d_flags |= D_ALLOCMAJ;
388}
389
390static void
391fini_cdevsw(struct cdevsw *devsw)
392{
393 if (devsw->d_flags & D_ALLOCMAJ) {
394 reserved_majors[devsw->d_maj] = 0;
395 devsw->d_maj = MAJOR_AUTO;
396 devsw->d_flags &= ~D_ALLOCMAJ;
397 } else if (devsw->d_maj == 0)
398 devsw->d_maj = 256;
399 devsw->d_flags &= ~D_INIT;
400}
401
402static void
403prep_cdevsw(struct cdevsw *devsw)
404{
405
406 devlock();
407
408 if (devsw->d_version != D_VERSION_00) {
409 printf(
410 "WARNING: Device driver \"%s\" has wrong version %s\n",
411 devsw->d_name, "and is disabled. Recompile KLD module.");
412 devsw->d_open = dead_open;
413 devsw->d_close = dead_close;
414 devsw->d_read = dead_read;
415 devsw->d_write = dead_write;
416 devsw->d_ioctl = dead_ioctl;
417 devsw->d_poll = dead_poll;
418 devsw->d_mmap = dead_mmap;
419 devsw->d_strategy = dead_strategy;
420 devsw->d_dump = dead_dump;
421 devsw->d_kqfilter = dead_kqfilter;
422 }
423
424 if (devsw->d_flags & D_TTY) {
425 if (devsw->d_ioctl == NULL) devsw->d_ioctl = ttyioctl;
426 if (devsw->d_read == NULL) devsw->d_read = ttyread;
427 if (devsw->d_write == NULL) devsw->d_write = ttywrite;
428 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = ttykqfilter;
429 if (devsw->d_poll == NULL) devsw->d_poll = ttypoll;
430 }
431
432 if (devsw->d_open == NULL) devsw->d_open = null_open;
433 if (devsw->d_close == NULL) devsw->d_close = null_close;
434 if (devsw->d_read == NULL) devsw->d_read = no_read;
435 if (devsw->d_write == NULL) devsw->d_write = no_write;
436 if (devsw->d_ioctl == NULL) devsw->d_ioctl = no_ioctl;
437 if (devsw->d_poll == NULL) devsw->d_poll = no_poll;
438 if (devsw->d_mmap == NULL) devsw->d_mmap = no_mmap;
439 if (devsw->d_strategy == NULL) devsw->d_strategy = no_strategy;
440 if (devsw->d_dump == NULL) devsw->d_dump = no_dump;
441 if (devsw->d_kqfilter == NULL) devsw->d_kqfilter = no_kqfilter;
442
443 LIST_INIT(&devsw->d_devs);
444
445 devsw->d_flags |= D_INIT;
446
447 if (devsw->d_maj == MAJOR_AUTO) {
448 find_major(devsw);
449 } else {
450 if (devsw->d_maj == 256) /* XXX: tty_cons.c is magic */
451 devsw->d_maj = 0;
452 KASSERT(devsw->d_maj >= 0 && devsw->d_maj < 256,
453 ("Invalid major (%d) in make_dev", devsw->d_maj));
454 if (reserved_majors[devsw->d_maj] != devsw->d_maj) {
455 printf("WARNING: driver \"%s\" used %s %d\n",
456 devsw->d_name, "unreserved major device number",
457 devsw->d_maj);
458 reserved_majors[devsw->d_maj] = devsw->d_maj;
459 }
460 }
461 devunlock();
462}
463
464struct cdev *
465make_dev(struct cdevsw *devsw, int minornr, uid_t uid, gid_t gid, int perms, const char *fmt, ...)
466{
467 struct cdev *dev;
468 va_list ap;
469 int i;
470
471 KASSERT((minornr & ~0xffff00ff) == 0,
472 ("Invalid minor (0x%x) in make_dev", minornr));
473
474 if (!(devsw->d_flags & D_INIT))
475 prep_cdevsw(devsw);
|
482 dev = makedev(devsw->d_maj, minornr);
| 476 dev = newdev(devsw->d_maj, minornr);
|
483 if (dev->si_flags & SI_CHEAPCLONE &&
484 dev->si_flags & SI_NAMED &&
485 dev->si_devsw == devsw) {
486 /*
487 * This is allowed as it removes races and generally
488 * simplifies cloning devices.
489 * XXX: still ??
490 */
491 return (dev);
492 }
493 devlock();
494 KASSERT(!(dev->si_flags & SI_NAMED),
495 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)",
496 devsw->d_name, major(dev), minor(dev), devtoname(dev)));
497
498 va_start(ap, fmt);
499 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
500 if (i > (sizeof dev->__si_namebuf - 1)) {
501 printf("WARNING: Device name truncated! (%s)",
502 dev->__si_namebuf);
503 }
504 va_end(ap);
505 dev->si_devsw = devsw;
506 dev->si_uid = uid;
507 dev->si_gid = gid;
508 dev->si_mode = perms;
509 dev->si_flags |= SI_NAMED;
510
511 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list);
512 devfs_create(dev);
513 devunlock();
514 return (dev);
515}
516
517int
518dev_named(struct cdev *pdev, const char *name)
519{
520 struct cdev *cdev;
521
522 if (strcmp(devtoname(pdev), name) == 0)
523 return (1);
524 LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
525 if (strcmp(devtoname(cdev), name) == 0)
526 return (1);
527 return (0);
528}
529
530void
531dev_depends(struct cdev *pdev, struct cdev *cdev)
532{
533
534 devlock();
535 cdev->si_parent = pdev;
536 cdev->si_flags |= SI_CHILD;
537 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
538 devunlock();
539}
540
541struct cdev *
542make_dev_alias(struct cdev *pdev, const char *fmt, ...)
543{
544 struct cdev *dev;
545 va_list ap;
546 int i;
547
548 dev = allocdev();
549 devlock();
550 dev->si_flags |= SI_ALIAS;
551 dev->si_flags |= SI_NAMED;
552 va_start(ap, fmt);
553 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
554 if (i > (sizeof dev->__si_namebuf - 1)) {
555 printf("WARNING: Device name truncated! (%s)",
556 dev->__si_namebuf);
557 }
558 va_end(ap);
559
560 devfs_create(dev);
561 devunlock();
562 dev_depends(pdev, dev);
563 return (dev);
564}
565
566static void
567idestroy_dev(struct cdev *dev)
568{
569 if (!(dev->si_flags & SI_NAMED)) {
570 printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
571 major(dev), minor(dev));
572 panic("don't do that");
573 }
574
575 devfs_destroy(dev);
576
577 /* Remove name marking */
578 dev->si_flags &= ~SI_NAMED;
579
580 /* If we are a child, remove us from the parents list */
581 if (dev->si_flags & SI_CHILD) {
582 LIST_REMOVE(dev, si_siblings);
583 dev->si_flags &= ~SI_CHILD;
584 }
585
586 /* Kill our children */
587 while (!LIST_EMPTY(&dev->si_children))
588 idestroy_dev(LIST_FIRST(&dev->si_children));
589
590 /* Remove from clone list */
591 if (dev->si_flags & SI_CLONELIST) {
592 LIST_REMOVE(dev, si_clone);
593 dev->si_flags &= ~SI_CLONELIST;
594 }
595
596 if (!(dev->si_flags & SI_ALIAS)) {
597 /* Remove from cdevsw list */
598 LIST_REMOVE(dev, si_list);
599
600 /* If cdevsw has no struct cdev *'s, clean it */
601 if (LIST_EMPTY(&dev->si_devsw->d_devs))
602 fini_cdevsw(dev->si_devsw);
603
604 LIST_REMOVE(dev, si_hash);
605 }
606 dev->si_drv1 = 0;
607 dev->si_drv2 = 0;
608 dev->si_devsw = NULL;
609 bzero(&dev->__si_u, sizeof(dev->__si_u));
610 dev->si_flags &= ~SI_ALIAS;
611 if (dev->si_refcount > 0) {
612 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
613 } else {
614 freedev(dev);
615 }
616}
617
618void
619destroy_dev(struct cdev *dev)
620{
621
622 devlock();
623 idestroy_dev(dev);
624 devunlock();
625}
626
627const char *
628devtoname(struct cdev *dev)
629{
630 char *p;
631 int mynor;
632
633 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
634 p = dev->si_name;
635 if (devsw(dev))
636 sprintf(p, "#%s/", devsw(dev)->d_name);
637 else
638 sprintf(p, "#%d/", major(dev));
639 p += strlen(p);
640 mynor = minor(dev);
641 if (mynor < 0 || mynor > 255)
642 sprintf(p, "%#x", (u_int)mynor);
643 else
644 sprintf(p, "%d", mynor);
645 }
646 return (dev->si_name);
647}
648
649int
650dev_stdclone(char *name, char **namep, const char *stem, int *unit)
651{
652 int u, i;
653
654 i = strlen(stem);
655 if (bcmp(stem, name, i) != 0)
656 return (0);
657 if (!isdigit(name[i]))
658 return (0);
659 u = 0;
660 if (name[i] == '0' && isdigit(name[i+1]))
661 return (0);
662 while (isdigit(name[i])) {
663 u *= 10;
664 u += name[i++] - '0';
665 }
666 if (u > 0xffffff)
667 return (0);
668 *unit = u;
669 if (namep)
670 *namep = &name[i];
671 if (name[i])
672 return (2);
673 return (1);
674}
675
676/*
677 * Helper functions for cloning device drivers.
678 *
679 * The objective here is to make it unnecessary for the device drivers to
680 * use rman or similar to manage their unit number space. Due to the way
681 * we do "on-demand" devices, using rman or other "private" methods
682 * will be very tricky to lock down properly once we lock down this file.
683 *
684 * Instead we give the drivers these routines which puts the struct cdev *'s that
685 * are to be managed on their own list, and gives the driver the ability
686 * to ask for the first free unit number or a given specified unit number.
687 *
688 * In addition these routines support paired devices (pty, nmdm and similar)
689 * by respecting a number of "flag" bits in the minor number.
690 *
691 */
692
693struct clonedevs {
694 LIST_HEAD(,cdev) head;
695};
696
697void
698clone_setup(struct clonedevs **cdp)
699{
700
701 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
702 LIST_INIT(&(*cdp)->head);
703}
704
705int
706clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra)
707{
708 struct clonedevs *cd;
709 struct cdev *dev, *dl, *de;
710 int unit, low, u;
711
712 KASSERT(*cdp != NULL,
713 ("clone_setup() not called in driver \"%s\"", csw->d_name));
714 KASSERT(!(extra & CLONE_UNITMASK),
715 ("Illegal extra bits (0x%x) in clone_create", extra));
716 KASSERT(*up <= CLONE_UNITMASK,
717 ("Too high unit (0x%x) in clone_create", *up));
718
719 if (csw->d_maj == MAJOR_AUTO)
720 find_major(csw);
721
722 /*
723 * Search the list for a lot of things in one go:
724 * A preexisting match is returned immediately.
725 * The lowest free unit number if we are passed -1, and the place
726 * in the list where we should insert that new element.
727 * The place to insert a specified unit number, if applicable
728 * the end of the list.
729 */
730 unit = *up;
731 low = extra;
732 de = dl = NULL;
733 cd = *cdp;
734 LIST_FOREACH(dev, &cd->head, si_clone) {
735 u = dev2unit(dev);
736 if (u == (unit | extra)) {
737 *dp = dev;
738 return (0);
739 }
740 if (unit == -1 && u == low) {
741 low++;
742 de = dev;
743 continue;
744 }
745 if (u > (unit | extra)) {
746 dl = dev;
747 break;
748 }
749 de = dev;
750 }
751 if (unit == -1)
752 unit = low & CLONE_UNITMASK;
| 477 if (dev->si_flags & SI_CHEAPCLONE &&
478 dev->si_flags & SI_NAMED &&
479 dev->si_devsw == devsw) {
480 /*
481 * This is allowed as it removes races and generally
482 * simplifies cloning devices.
483 * XXX: still ??
484 */
485 return (dev);
486 }
487 devlock();
488 KASSERT(!(dev->si_flags & SI_NAMED),
489 ("make_dev() by driver %s on pre-existing device (maj=%d, min=%d, name=%s)",
490 devsw->d_name, major(dev), minor(dev), devtoname(dev)));
491
492 va_start(ap, fmt);
493 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
494 if (i > (sizeof dev->__si_namebuf - 1)) {
495 printf("WARNING: Device name truncated! (%s)",
496 dev->__si_namebuf);
497 }
498 va_end(ap);
499 dev->si_devsw = devsw;
500 dev->si_uid = uid;
501 dev->si_gid = gid;
502 dev->si_mode = perms;
503 dev->si_flags |= SI_NAMED;
504
505 LIST_INSERT_HEAD(&devsw->d_devs, dev, si_list);
506 devfs_create(dev);
507 devunlock();
508 return (dev);
509}
510
511int
512dev_named(struct cdev *pdev, const char *name)
513{
514 struct cdev *cdev;
515
516 if (strcmp(devtoname(pdev), name) == 0)
517 return (1);
518 LIST_FOREACH(cdev, &pdev->si_children, si_siblings)
519 if (strcmp(devtoname(cdev), name) == 0)
520 return (1);
521 return (0);
522}
523
524void
525dev_depends(struct cdev *pdev, struct cdev *cdev)
526{
527
528 devlock();
529 cdev->si_parent = pdev;
530 cdev->si_flags |= SI_CHILD;
531 LIST_INSERT_HEAD(&pdev->si_children, cdev, si_siblings);
532 devunlock();
533}
534
535struct cdev *
536make_dev_alias(struct cdev *pdev, const char *fmt, ...)
537{
538 struct cdev *dev;
539 va_list ap;
540 int i;
541
542 dev = allocdev();
543 devlock();
544 dev->si_flags |= SI_ALIAS;
545 dev->si_flags |= SI_NAMED;
546 va_start(ap, fmt);
547 i = vsnrprintf(dev->__si_namebuf, sizeof dev->__si_namebuf, 32, fmt, ap);
548 if (i > (sizeof dev->__si_namebuf - 1)) {
549 printf("WARNING: Device name truncated! (%s)",
550 dev->__si_namebuf);
551 }
552 va_end(ap);
553
554 devfs_create(dev);
555 devunlock();
556 dev_depends(pdev, dev);
557 return (dev);
558}
559
560static void
561idestroy_dev(struct cdev *dev)
562{
563 if (!(dev->si_flags & SI_NAMED)) {
564 printf( "WARNING: Driver mistake: destroy_dev on %d/%d\n",
565 major(dev), minor(dev));
566 panic("don't do that");
567 }
568
569 devfs_destroy(dev);
570
571 /* Remove name marking */
572 dev->si_flags &= ~SI_NAMED;
573
574 /* If we are a child, remove us from the parents list */
575 if (dev->si_flags & SI_CHILD) {
576 LIST_REMOVE(dev, si_siblings);
577 dev->si_flags &= ~SI_CHILD;
578 }
579
580 /* Kill our children */
581 while (!LIST_EMPTY(&dev->si_children))
582 idestroy_dev(LIST_FIRST(&dev->si_children));
583
584 /* Remove from clone list */
585 if (dev->si_flags & SI_CLONELIST) {
586 LIST_REMOVE(dev, si_clone);
587 dev->si_flags &= ~SI_CLONELIST;
588 }
589
590 if (!(dev->si_flags & SI_ALIAS)) {
591 /* Remove from cdevsw list */
592 LIST_REMOVE(dev, si_list);
593
594 /* If cdevsw has no struct cdev *'s, clean it */
595 if (LIST_EMPTY(&dev->si_devsw->d_devs))
596 fini_cdevsw(dev->si_devsw);
597
598 LIST_REMOVE(dev, si_hash);
599 }
600 dev->si_drv1 = 0;
601 dev->si_drv2 = 0;
602 dev->si_devsw = NULL;
603 bzero(&dev->__si_u, sizeof(dev->__si_u));
604 dev->si_flags &= ~SI_ALIAS;
605 if (dev->si_refcount > 0) {
606 LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
607 } else {
608 freedev(dev);
609 }
610}
611
612void
613destroy_dev(struct cdev *dev)
614{
615
616 devlock();
617 idestroy_dev(dev);
618 devunlock();
619}
620
621const char *
622devtoname(struct cdev *dev)
623{
624 char *p;
625 int mynor;
626
627 if (dev->si_name[0] == '#' || dev->si_name[0] == '\0') {
628 p = dev->si_name;
629 if (devsw(dev))
630 sprintf(p, "#%s/", devsw(dev)->d_name);
631 else
632 sprintf(p, "#%d/", major(dev));
633 p += strlen(p);
634 mynor = minor(dev);
635 if (mynor < 0 || mynor > 255)
636 sprintf(p, "%#x", (u_int)mynor);
637 else
638 sprintf(p, "%d", mynor);
639 }
640 return (dev->si_name);
641}
642
643int
644dev_stdclone(char *name, char **namep, const char *stem, int *unit)
645{
646 int u, i;
647
648 i = strlen(stem);
649 if (bcmp(stem, name, i) != 0)
650 return (0);
651 if (!isdigit(name[i]))
652 return (0);
653 u = 0;
654 if (name[i] == '0' && isdigit(name[i+1]))
655 return (0);
656 while (isdigit(name[i])) {
657 u *= 10;
658 u += name[i++] - '0';
659 }
660 if (u > 0xffffff)
661 return (0);
662 *unit = u;
663 if (namep)
664 *namep = &name[i];
665 if (name[i])
666 return (2);
667 return (1);
668}
669
670/*
671 * Helper functions for cloning device drivers.
672 *
673 * The objective here is to make it unnecessary for the device drivers to
674 * use rman or similar to manage their unit number space. Due to the way
675 * we do "on-demand" devices, using rman or other "private" methods
676 * will be very tricky to lock down properly once we lock down this file.
677 *
678 * Instead we give the drivers these routines which puts the struct cdev *'s that
679 * are to be managed on their own list, and gives the driver the ability
680 * to ask for the first free unit number or a given specified unit number.
681 *
682 * In addition these routines support paired devices (pty, nmdm and similar)
683 * by respecting a number of "flag" bits in the minor number.
684 *
685 */
686
687struct clonedevs {
688 LIST_HEAD(,cdev) head;
689};
690
691void
692clone_setup(struct clonedevs **cdp)
693{
694
695 *cdp = malloc(sizeof **cdp, M_DEVBUF, M_WAITOK | M_ZERO);
696 LIST_INIT(&(*cdp)->head);
697}
698
699int
700clone_create(struct clonedevs **cdp, struct cdevsw *csw, int *up, struct cdev **dp, u_int extra)
701{
702 struct clonedevs *cd;
703 struct cdev *dev, *dl, *de;
704 int unit, low, u;
705
706 KASSERT(*cdp != NULL,
707 ("clone_setup() not called in driver \"%s\"", csw->d_name));
708 KASSERT(!(extra & CLONE_UNITMASK),
709 ("Illegal extra bits (0x%x) in clone_create", extra));
710 KASSERT(*up <= CLONE_UNITMASK,
711 ("Too high unit (0x%x) in clone_create", *up));
712
713 if (csw->d_maj == MAJOR_AUTO)
714 find_major(csw);
715
716 /*
717 * Search the list for a lot of things in one go:
718 * A preexisting match is returned immediately.
719 * The lowest free unit number if we are passed -1, and the place
720 * in the list where we should insert that new element.
721 * The place to insert a specified unit number, if applicable
722 * the end of the list.
723 */
724 unit = *up;
725 low = extra;
726 de = dl = NULL;
727 cd = *cdp;
728 LIST_FOREACH(dev, &cd->head, si_clone) {
729 u = dev2unit(dev);
730 if (u == (unit | extra)) {
731 *dp = dev;
732 return (0);
733 }
734 if (unit == -1 && u == low) {
735 low++;
736 de = dev;
737 continue;
738 }
739 if (u > (unit | extra)) {
740 dl = dev;
741 break;
742 }
743 de = dev;
744 }
745 if (unit == -1)
746 unit = low & CLONE_UNITMASK;
|
753 dev = makedev(csw->d_maj, unit2minor(unit | extra));
| 747 dev = newdev(csw->d_maj, unit2minor(unit | extra));
|
754 KASSERT(!(dev->si_flags & SI_CLONELIST),
755 ("Dev %p should not be on clonelist", dev));
756 if (dl != NULL)
757 LIST_INSERT_BEFORE(dl, dev, si_clone);
758 else if (de != NULL)
759 LIST_INSERT_AFTER(de, dev, si_clone);
760 else
761 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
762 dev->si_flags |= SI_CLONELIST;
763 *up = unit;
764 return (1);
765}
766
767/*
768 * Kill everything still on the list. The driver should already have
769 * disposed of any softc hung of the struct cdev *'s at this time.
770 */
771void
772clone_cleanup(struct clonedevs **cdp)
773{
774 struct cdev *dev, *tdev;
775 struct clonedevs *cd;
776
777 cd = *cdp;
778 if (cd == NULL)
779 return;
780 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
781 KASSERT(dev->si_flags & SI_NAMED,
782 ("Driver has goofed in cloning underways udev %x", dev->si_udev));
783 destroy_dev(dev);
784 }
785 free(cd, M_DEVBUF);
786 *cdp = NULL;
787}
788
789/*
790 * Helper sysctl for devname(3). We're given a {u}struct cdev *and return
791 * the name, if any, registered by the device driver.
792 */
793static int
794sysctl_devname(SYSCTL_HANDLER_ARGS)
795{
796 int error;
| 748 KASSERT(!(dev->si_flags & SI_CLONELIST),
749 ("Dev %p should not be on clonelist", dev));
750 if (dl != NULL)
751 LIST_INSERT_BEFORE(dl, dev, si_clone);
752 else if (de != NULL)
753 LIST_INSERT_AFTER(de, dev, si_clone);
754 else
755 LIST_INSERT_HEAD(&cd->head, dev, si_clone);
756 dev->si_flags |= SI_CLONELIST;
757 *up = unit;
758 return (1);
759}
760
761/*
762 * Kill everything still on the list. The driver should already have
763 * disposed of any softc hung of the struct cdev *'s at this time.
764 */
765void
766clone_cleanup(struct clonedevs **cdp)
767{
768 struct cdev *dev, *tdev;
769 struct clonedevs *cd;
770
771 cd = *cdp;
772 if (cd == NULL)
773 return;
774 LIST_FOREACH_SAFE(dev, &cd->head, si_clone, tdev) {
775 KASSERT(dev->si_flags & SI_NAMED,
776 ("Driver has goofed in cloning underways udev %x", dev->si_udev));
777 destroy_dev(dev);
778 }
779 free(cd, M_DEVBUF);
780 *cdp = NULL;
781}
782
783/*
784 * Helper sysctl for devname(3). We're given a {u}struct cdev *and return
785 * the name, if any, registered by the device driver.
786 */
787static int
788sysctl_devname(SYSCTL_HANDLER_ARGS)
789{
790 int error;
|
797 udev_t ud;
| 791 dev_t ud;
|
798 struct cdev *dev;
799
800 error = SYSCTL_IN(req, &ud, sizeof (ud));
801 if (error)
802 return (error);
| 792 struct cdev *dev;
793
794 error = SYSCTL_IN(req, &ud, sizeof (ud));
795 if (error)
796 return (error);
|
803 if (ud == NOUDEV)
| 797 if (ud == NODEV)
|
804 return(EINVAL);
| 798 return(EINVAL);
|
805 dev = udev2dev(ud);
806 if (dev == NODEV)
| 799 dev = findcdev(ud);
800 if (dev == NULL)
|
807 error = ENOENT;
808 else
809 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
810 return (error);
811}
812
813SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
814 NULL, 0, sysctl_devname, "", "devname(3) handler");
| 801 error = ENOENT;
802 else
803 error = SYSCTL_OUT(req, dev->si_name, strlen(dev->si_name) + 1);
804 return (error);
805}
806
807SYSCTL_PROC(_kern, OID_AUTO, devname, CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_ANYBODY,
808 NULL, 0, sysctl_devname, "", "devname(3) handler");
|