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 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27
28 /*
29 * evtchn.c
30 *
31 * Driver for receiving and demuxing event-channel signals.
32 *
33 * Copyright (c) 2004-2005, K A Fraser
34 * Multi-process extensions Copyright (c) 2004, Steven Smith
35 *
36 * This file may be distributed separately from the Linux kernel, or
37 * incorporated into other software packages, subject to the following license:
38 *
39 * Permission is hereby granted, free of charge, to any person obtaining a copy
40 * of this source file (the "Software"), to deal in the Software without
41 * restriction, including without limitation the rights to use, copy, modify,
42 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
43 * and to permit persons to whom the Software is furnished to do so, subject to
44 * the following conditions:
45 *
46 * The above copyright notice and this permission notice shall be included in
47 * all copies or substantial portions of the Software.
48 *
49 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
50 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
51 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
52 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
53 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
54 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
55 * IN THE SOFTWARE.
56 */
57
58 #include <sys/types.h>
59 #include <sys/hypervisor.h>
60 #include <sys/machsystm.h>
61 #include <sys/mutex.h>
62 #include <sys/evtchn_impl.h>
63 #include <sys/ddi_impldefs.h>
64 #include <sys/avintr.h>
65 #include <sys/cpuvar.h>
66 #include <sys/smp_impldefs.h>
67 #include <sys/archsystm.h>
68 #include <sys/sysmacros.h>
69 #include <sys/fcntl.h>
70 #include <sys/open.h>
71 #include <sys/stat.h>
72 #include <sys/psm.h>
73 #include <sys/cpu.h>
74 #include <sys/cmn_err.h>
75 #include <sys/xen_errno.h>
76 #include <sys/policy.h>
77 #include <xen/sys/evtchn.h>
78
79 /* Some handy macros */
80 #define EVTCHNDRV_MINOR2INST(minor) ((int)(minor))
81 #define EVTCHNDRV_DEFAULT_NCLONES 256
82 #define EVTCHNDRV_INST2SOFTS(inst) \
83 (ddi_get_soft_state(evtchndrv_statep, (inst)))
84
85 /* Soft state data structure for evtchn driver */
86 struct evtsoftdata {
87 dev_info_t *dip;
88 /* Notification ring, accessed via /dev/xen/evtchn. */
89 #define EVTCHN_RING_SIZE (PAGESIZE / sizeof (evtchn_port_t))
90 #define EVTCHN_RING_MASK(_i) ((_i) & (EVTCHN_RING_SIZE - 1))
91 evtchn_port_t *ring;
92 unsigned int ring_cons, ring_prod, ring_overflow;
93
94 kcondvar_t evtchn_wait; /* Processes wait on this when ring is empty. */
95 kmutex_t evtchn_lock;
96 struct pollhead evtchn_pollhead;
97
98 pid_t pid; /* last pid to bind to this event channel. */
99 processorid_t cpu; /* cpu thread/evtchn is bound to */
100 };
101
102 static void *evtchndrv_statep;
103 int evtchndrv_nclones = EVTCHNDRV_DEFAULT_NCLONES;
104 static int *evtchndrv_clone_tab;
105 static dev_info_t *evtchndrv_dip;
106 static kmutex_t evtchndrv_clone_tab_mutex;
107
108 static int evtchndrv_detach(dev_info_t *, ddi_detach_cmd_t);
109
110 /* Who's bound to each port? */
111 static struct evtsoftdata *port_user[NR_EVENT_CHANNELS];
112 static kmutex_t port_user_lock;
113
114 void
115 evtchn_device_upcall()
116 {
117 struct evtsoftdata *ep;
118 int port;
119
120 /*
121 * This is quite gross, we had to leave the evtchn that led to this
122 * invocation in a per-cpu mailbox, retrieve it now.
123 * We do this because the interface doesn't offer us a way to pass
124 * a dynamic argument up through the generic interrupt service layer.
125 * The mailbox is safe since we either run with interrupts disabled or
126 * non-preemptable till we reach here.
127 */
128 port = CPU->cpu_m.mcpu_ec_mbox;
129 ASSERT(port != 0);
130 CPU->cpu_m.mcpu_ec_mbox = 0;
131 ec_clear_evtchn(port);
132 mutex_enter(&port_user_lock);
133
134 if ((ep = port_user[port]) != NULL) {
135 mutex_enter(&ep->evtchn_lock);
136 if ((ep->ring_prod - ep->ring_cons) < EVTCHN_RING_SIZE) {
137 ep->ring[EVTCHN_RING_MASK(ep->ring_prod)] = port;
138 /*
139 * Wake up reader when ring goes non-empty
140 */
141 if (ep->ring_cons == ep->ring_prod++) {
142 cv_signal(&ep->evtchn_wait);
143 mutex_exit(&ep->evtchn_lock);
144 pollwakeup(&ep->evtchn_pollhead,
145 POLLIN | POLLRDNORM);
146 goto done;
147 }
148 } else {
149 ep->ring_overflow = 1;
150 }
151 mutex_exit(&ep->evtchn_lock);
152 }
153
154 done:
155 mutex_exit(&port_user_lock);
156 }
157
158 /* ARGSUSED */
159 static int
160 evtchndrv_read(dev_t dev, struct uio *uio, cred_t *cr)
161 {
162 int rc = 0;
163 ssize_t count;
164 unsigned int c, p, bytes1 = 0, bytes2 = 0;
165 struct evtsoftdata *ep;
166 minor_t minor = getminor(dev);
167
168 if (secpolicy_xvm_control(cr))
169 return (EPERM);
170
171 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
172
173 /* Whole number of ports. */
174 count = uio->uio_resid;
175 count &= ~(sizeof (evtchn_port_t) - 1);
176
177 if (count == 0)
178 return (0);
179
180 if (count > PAGESIZE)
181 count = PAGESIZE;
182
183 mutex_enter(&ep->evtchn_lock);
184 for (;;) {
185 if (ep->ring_overflow) {
186 rc = EFBIG;
187 goto done;
188 }
189
190 if ((c = ep->ring_cons) != (p = ep->ring_prod))
191 break;
192
193 if (uio->uio_fmode & O_NONBLOCK) {
194 rc = EAGAIN;
195 goto done;
196 }
197
198 if (cv_wait_sig(&ep->evtchn_wait, &ep->evtchn_lock) == 0) {
199 rc = EINTR;
200 goto done;
201 }
202 }
203
204 /* Byte lengths of two chunks. Chunk split (if any) is at ring wrap. */
205 if (((c ^ p) & EVTCHN_RING_SIZE) != 0) {
206 bytes1 = (EVTCHN_RING_SIZE - EVTCHN_RING_MASK(c)) *
207 sizeof (evtchn_port_t);
208 bytes2 = EVTCHN_RING_MASK(p) * sizeof (evtchn_port_t);
209 } else {
210 bytes1 = (p - c) * sizeof (evtchn_port_t);
211 bytes2 = 0;
212 }
213
214 /* Truncate chunks according to caller's maximum byte count. */
215 if (bytes1 > count) {
216 bytes1 = count;
217 bytes2 = 0;
218 } else if ((bytes1 + bytes2) > count) {
219 bytes2 = count - bytes1;
220 }
221
222 if (uiomove(&ep->ring[EVTCHN_RING_MASK(c)], bytes1, UIO_READ, uio) ||
223 ((bytes2 != 0) && uiomove(&ep->ring[0], bytes2, UIO_READ, uio))) {
224 rc = EFAULT;
225 goto done;
226 }
227
228 ep->ring_cons += (bytes1 + bytes2) / sizeof (evtchn_port_t);
229 done:
230 mutex_exit(&ep->evtchn_lock);
231 return (rc);
232 }
233
234 /* ARGSUSED */
235 static int
236 evtchndrv_write(dev_t dev, struct uio *uio, cred_t *cr)
237 {
238 int rc, i;
239 ssize_t count;
240 evtchn_port_t *kbuf;
241 struct evtsoftdata *ep;
242 ulong_t flags;
243 minor_t minor = getminor(dev);
244 evtchn_port_t sbuf[32];
245
246 if (secpolicy_xvm_control(cr))
247 return (EPERM);
248
249 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
250
251
252 /* Whole number of ports. */
253 count = uio->uio_resid;
254 count &= ~(sizeof (evtchn_port_t) - 1);
255
256 if (count == 0)
257 return (0);
258
259 if (count > PAGESIZE)
260 count = PAGESIZE;
261
262 if (count <= sizeof (sbuf))
263 kbuf = sbuf;
264 else
265 kbuf = kmem_alloc(PAGESIZE, KM_SLEEP);
266 if ((rc = uiomove(kbuf, count, UIO_WRITE, uio)) != 0)
267 goto out;
268
269 mutex_enter(&port_user_lock);
270 for (i = 0; i < (count / sizeof (evtchn_port_t)); i++)
271 if ((kbuf[i] < NR_EVENT_CHANNELS) &&
272 (port_user[kbuf[i]] == ep)) {
273 flags = intr_clear();
274 ec_unmask_evtchn(kbuf[i]);
275 intr_restore(flags);
276 }
277 mutex_exit(&port_user_lock);
278
279 out:
280 if (kbuf != sbuf)
281 kmem_free(kbuf, PAGESIZE);
282 return (rc);
283 }
284
285 static void
286 evtchn_bind_to_user(struct evtsoftdata *u, int port)
287 {
288 ulong_t flags;
289
290 /*
291 * save away the PID of the last process to bind to this event channel.
292 * Useful for debugging.
293 */
294 u->pid = ddi_get_pid();
295
296 mutex_enter(&port_user_lock);
297 ASSERT(port_user[port] == NULL);
298 port_user[port] = u;
299 ec_irq_add_evtchn(ec_dev_irq, port);
300 flags = intr_clear();
301 ec_unmask_evtchn(port);
302 intr_restore(flags);
303 mutex_exit(&port_user_lock);
304 }
305
306 static void
307 evtchndrv_close_evtchn(int port)
308 {
309 struct evtsoftdata *ep;
310
311 ASSERT(MUTEX_HELD(&port_user_lock));
312 ep = port_user[port];
313 ASSERT(ep != NULL);
314 (void) ec_mask_evtchn(port);
315 /*
316 * It is possible the event is in transit to us.
317 * If it is already in the ring buffer, then a client may
318 * get a spurious event notification on the next read of
319 * of the evtchn device. Clients will need to be able to
320 * handle getting a spurious event notification.
321 */
322 port_user[port] = NULL;
323 /*
324 * The event is masked and should stay so, clean it up.
325 */
326 ec_irq_rm_evtchn(ec_dev_irq, port);
327 }
328
329 /* ARGSUSED */
330 static int
331 evtchndrv_ioctl(dev_t dev, int cmd, intptr_t data, int flag, cred_t *cr,
332 int *rvalp)
333 {
334 int err = 0;
335 struct evtsoftdata *ep;
336 minor_t minor = getminor(dev);
337
338 if (secpolicy_xvm_control(cr))
339 return (EPERM);
340
341 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
342
343 *rvalp = 0;
344
345 switch (cmd) {
346 case IOCTL_EVTCHN_BIND_VIRQ: {
347 struct ioctl_evtchn_bind_virq bind;
348
349 if (copyin((void *)data, &bind, sizeof (bind))) {
350 err = EFAULT;
351 break;
352 }
353
354 if ((err = xen_bind_virq(bind.virq, 0, rvalp)) != 0)
355 break;
356
357 evtchn_bind_to_user(ep, *rvalp);
358 break;
359 }
360
361 case IOCTL_EVTCHN_BIND_INTERDOMAIN: {
362 struct ioctl_evtchn_bind_interdomain bind;
363
364 if (copyin((void *)data, &bind, sizeof (bind))) {
365 err = EFAULT;
366 break;
367 }
368
369 if ((err = xen_bind_interdomain(bind.remote_domain,
370 bind.remote_port, rvalp)) != 0)
371 break;
372
373 ec_bind_vcpu(*rvalp, 0);
374 evtchn_bind_to_user(ep, *rvalp);
375 break;
376 }
377
378 case IOCTL_EVTCHN_BIND_UNBOUND_PORT: {
379 struct ioctl_evtchn_bind_unbound_port bind;
380
381 if (copyin((void *)data, &bind, sizeof (bind))) {
382 err = EFAULT;
383 break;
384 }
385
386 if ((err = xen_alloc_unbound_evtchn(bind.remote_domain,
387 rvalp)) != 0)
388 break;
389
390 evtchn_bind_to_user(ep, *rvalp);
391 break;
392 }
393
394 case IOCTL_EVTCHN_UNBIND: {
395 struct ioctl_evtchn_unbind unbind;
396
397 if (copyin((void *)data, &unbind, sizeof (unbind))) {
398 err = EFAULT;
399 break;
400 }
401
402 if (unbind.port >= NR_EVENT_CHANNELS) {
403 err = EFAULT;
404 break;
405 }
406
407 mutex_enter(&port_user_lock);
408
409 if (port_user[unbind.port] != ep) {
410 mutex_exit(&port_user_lock);
411 err = ENOTCONN;
412 break;
413 }
414
415 evtchndrv_close_evtchn(unbind.port);
416 mutex_exit(&port_user_lock);
417 break;
418 }
419
420 case IOCTL_EVTCHN_NOTIFY: {
421 struct ioctl_evtchn_notify notify;
422
423 if (copyin((void *)data, ¬ify, sizeof (notify))) {
424 err = EFAULT;
425 break;
426 }
427
428 if (notify.port >= NR_EVENT_CHANNELS) {
429 err = EINVAL;
430 } else if (port_user[notify.port] != ep) {
431 err = ENOTCONN;
432 } else {
433 ec_notify_via_evtchn(notify.port);
434 }
435 break;
436 }
437
438 default:
439 err = ENOSYS;
440 }
441
442 return (err);
443 }
444
445 static int
446 evtchndrv_poll(dev_t dev, short ev, int anyyet, short *revp, pollhead_t **phpp)
447 {
448 struct evtsoftdata *ep;
449 minor_t minor = getminor(dev);
450 short mask = 0;
451
452 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
453 *phpp = (struct pollhead *)NULL;
454
455 if (ev & POLLOUT)
456 mask |= POLLOUT;
457 if (ep->ring_overflow)
458 mask |= POLLERR;
459 if (ev & (POLLIN | POLLRDNORM)) {
460 mutex_enter(&ep->evtchn_lock);
461 if (ep->ring_cons != ep->ring_prod)
462 mask |= (POLLIN | POLLRDNORM) & ev;
463 else
464 if (mask == 0 && !anyyet)
465 *phpp = &ep->evtchn_pollhead;
466 mutex_exit(&ep->evtchn_lock);
467 }
468 *revp = mask;
469 return (0);
470 }
471
472
473 /* ARGSUSED */
474 static int
475 evtchndrv_open(dev_t *devp, int flag, int otyp, cred_t *credp)
476 {
477 struct evtsoftdata *ep;
478 minor_t minor = getminor(*devp);
479
480 if (otyp == OTYP_BLK)
481 return (ENXIO);
482
483 /*
484 * only allow open on minor = 0 - the clone device
485 */
486 if (minor != 0)
487 return (ENXIO);
488
489 /*
490 * find a free slot and grab it
491 */
492 mutex_enter(&evtchndrv_clone_tab_mutex);
493 for (minor = 1; minor < evtchndrv_nclones; minor++) {
494 if (evtchndrv_clone_tab[minor] == 0) {
495 evtchndrv_clone_tab[minor] = 1;
496 break;
497 }
498 }
499 mutex_exit(&evtchndrv_clone_tab_mutex);
500 if (minor == evtchndrv_nclones)
501 return (EAGAIN);
502
503 /* Allocate softstate structure */
504 if (ddi_soft_state_zalloc(evtchndrv_statep,
505 EVTCHNDRV_MINOR2INST(minor)) != DDI_SUCCESS) {
506 mutex_enter(&evtchndrv_clone_tab_mutex);
507 evtchndrv_clone_tab[minor] = 0;
508 mutex_exit(&evtchndrv_clone_tab_mutex);
509 return (EAGAIN);
510 }
511 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
512
513 /* ... and init it */
514 ep->dip = evtchndrv_dip;
515
516 cv_init(&ep->evtchn_wait, NULL, CV_DEFAULT, NULL);
517 mutex_init(&ep->evtchn_lock, NULL, MUTEX_DEFAULT, NULL);
518
519 ep->ring = kmem_alloc(PAGESIZE, KM_SLEEP);
520
521 /* clone driver */
522 *devp = makedevice(getmajor(*devp), minor);
523
524 return (0);
525 }
526
527 /* ARGSUSED */
528 static int
529 evtchndrv_close(dev_t dev, int flag, int otyp, struct cred *credp)
530 {
531 struct evtsoftdata *ep;
532 minor_t minor = getminor(dev);
533 int i;
534
535 ep = EVTCHNDRV_INST2SOFTS(EVTCHNDRV_MINOR2INST(minor));
536 if (ep == NULL)
537 return (ENXIO);
538
539 mutex_enter(&port_user_lock);
540
541
542 for (i = 0; i < NR_EVENT_CHANNELS; i++) {
543 if (port_user[i] != ep)
544 continue;
545
546 evtchndrv_close_evtchn(i);
547 }
548
549 mutex_exit(&port_user_lock);
550
551 kmem_free(ep->ring, PAGESIZE);
552 ddi_soft_state_free(evtchndrv_statep, EVTCHNDRV_MINOR2INST(minor));
553
554 /*
555 * free clone tab slot
556 */
557 mutex_enter(&evtchndrv_clone_tab_mutex);
558 evtchndrv_clone_tab[minor] = 0;
559 mutex_exit(&evtchndrv_clone_tab_mutex);
560
561 return (0);
562 }
563
564 /* ARGSUSED */
565 static int
566 evtchndrv_info(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **result)
567 {
568 dev_t dev = (dev_t)arg;
569 minor_t minor = getminor(dev);
570 int retval;
571
572 switch (cmd) {
573 case DDI_INFO_DEVT2DEVINFO:
574 if (minor != 0 || evtchndrv_dip == NULL) {
575 *result = (void *)NULL;
576 retval = DDI_FAILURE;
577 } else {
578 *result = (void *)evtchndrv_dip;
579 retval = DDI_SUCCESS;
580 }
581 break;
582 case DDI_INFO_DEVT2INSTANCE:
583 *result = (void *)0;
584 retval = DDI_SUCCESS;
585 break;
586 default:
587 retval = DDI_FAILURE;
588 }
589 return (retval);
590 }
591
592
593 static int
594 evtchndrv_attach(dev_info_t *dip, ddi_attach_cmd_t cmd)
595 {
596 int error;
597 int unit = ddi_get_instance(dip);
598
599
600 switch (cmd) {
601 case DDI_ATTACH:
602 break;
603 case DDI_RESUME:
604 return (DDI_SUCCESS);
605 default:
606 cmn_err(CE_WARN, "evtchn_attach: unknown cmd 0x%x\n", cmd);
607 return (DDI_FAILURE);
608 }
609
610 /* DDI_ATTACH */
611
612 /*
613 * only one instance - but we clone using the open routine
614 */
615 if (ddi_get_instance(dip) > 0)
616 return (DDI_FAILURE);
617
618 mutex_init(&evtchndrv_clone_tab_mutex, NULL, MUTEX_DRIVER,
619 NULL);
620
621 error = ddi_create_minor_node(dip, "evtchn", S_IFCHR, unit,
622 DDI_PSEUDO, NULL);
623 if (error != DDI_SUCCESS)
624 goto fail;
625
626 /*
627 * save dip for getinfo
628 */
629 evtchndrv_dip = dip;
630 ddi_report_dev(dip);
631
632 mutex_init(&port_user_lock, NULL, MUTEX_DRIVER, NULL);
633 (void) memset(port_user, 0, sizeof (port_user));
634
635 ec_dev_irq = ec_dev_alloc_irq();
636 (void) add_avintr(NULL, IPL_EVTCHN, (avfunc)evtchn_device_upcall,
637 "evtchn_driver", ec_dev_irq, NULL, NULL, NULL, dip);
638
639 return (DDI_SUCCESS);
640
641 fail:
642 (void) evtchndrv_detach(dip, DDI_DETACH);
643 return (error);
644 }
645
646 /*ARGSUSED*/
647 static int
648 evtchndrv_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
649 {
650 /*
651 * Don't allow detach for now.
652 */
653 return (DDI_FAILURE);
654 }
655
656 /* Solaris driver framework */
657
658 static struct cb_ops evtchndrv_cb_ops = {
659 evtchndrv_open, /* cb_open */
660 evtchndrv_close, /* cb_close */
661 nodev, /* cb_strategy */
662 nodev, /* cb_print */
663 nodev, /* cb_dump */
664 evtchndrv_read, /* cb_read */
665 evtchndrv_write, /* cb_write */
666 evtchndrv_ioctl, /* cb_ioctl */
667 nodev, /* cb_devmap */
668 nodev, /* cb_mmap */
669 nodev, /* cb_segmap */
670 evtchndrv_poll, /* cb_chpoll */
671 ddi_prop_op, /* cb_prop_op */
672 0, /* cb_stream */
673 D_NEW | D_MP | D_64BIT /* cb_flag */
674 };
675
676 static struct dev_ops evtchndrv_dev_ops = {
677 DEVO_REV, /* devo_rev */
678 0, /* devo_refcnt */
679 evtchndrv_info, /* devo_getinfo */
680 nulldev, /* devo_identify */
681 nulldev, /* devo_probe */
682 evtchndrv_attach, /* devo_attach */
683 evtchndrv_detach, /* devo_detach */
684 nodev, /* devo_reset */
685 &evtchndrv_cb_ops, /* devo_cb_ops */
686 NULL, /* devo_bus_ops */
687 NULL, /* power */
688 ddi_quiesce_not_needed, /* devo_quiesce */
689 };
690
691 static struct modldrv modldrv = {
692 &mod_driverops, /* Type of module. This one is a driver */
693 "Evtchn driver", /* Name of the module. */
694 &evtchndrv_dev_ops /* driver ops */
695 };
696
697 static struct modlinkage modlinkage = {
698 MODREV_1,
699 &modldrv,
700 NULL
701 };
702
703 int
704 _init(void)
705 {
706 int err;
707
708 err = ddi_soft_state_init(&evtchndrv_statep,
709 sizeof (struct evtsoftdata), 1);
710 if (err)
711 return (err);
712
713 err = mod_install(&modlinkage);
714 if (err)
715 ddi_soft_state_fini(&evtchndrv_statep);
716 else
717 evtchndrv_clone_tab = kmem_zalloc(
718 sizeof (int) * evtchndrv_nclones, KM_SLEEP);
719 return (err);
720 }
721
722 int
723 _fini(void)
724 {
725 int e;
726
727 e = mod_remove(&modlinkage);
728 if (e)
729 return (e);
730
731 ddi_soft_state_fini(&evtchndrv_statep);
732
733 return (0);
734 }
735
736 int
737 _info(struct modinfo *modinfop)
738 {
739 return (mod_info(&modlinkage, modinfop));
740 }