| 1 | /* $NetBSD: kern_drvctl.c,v 1.41 2015/12/07 20:01:43 christos Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2004 |
| 5 | * Matthias Drochner. All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions, and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 26 | * SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | __KERNEL_RCSID(0, "$NetBSD: kern_drvctl.c,v 1.41 2015/12/07 20:01:43 christos Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/systm.h> |
| 34 | #include <sys/kernel.h> |
| 35 | #include <sys/conf.h> |
| 36 | #include <sys/device.h> |
| 37 | #include <sys/event.h> |
| 38 | #include <sys/kmem.h> |
| 39 | #include <sys/ioctl.h> |
| 40 | #include <sys/fcntl.h> |
| 41 | #include <sys/file.h> |
| 42 | #include <sys/filedesc.h> |
| 43 | #include <sys/select.h> |
| 44 | #include <sys/poll.h> |
| 45 | #include <sys/drvctlio.h> |
| 46 | #include <sys/devmon.h> |
| 47 | #include <sys/stat.h> |
| 48 | #include <sys/kauth.h> |
| 49 | #include <sys/lwp.h> |
| 50 | #include <sys/module.h> |
| 51 | |
| 52 | #include "ioconf.h" |
| 53 | |
| 54 | struct drvctl_event { |
| 55 | TAILQ_ENTRY(drvctl_event) dce_link; |
| 56 | prop_dictionary_t dce_event; |
| 57 | }; |
| 58 | |
| 59 | TAILQ_HEAD(drvctl_queue, drvctl_event); |
| 60 | |
| 61 | static struct drvctl_queue drvctl_eventq; /* FIFO */ |
| 62 | static kcondvar_t drvctl_cond; |
| 63 | static kmutex_t drvctl_lock; |
| 64 | static int drvctl_nopen = 0, drvctl_eventcnt = 0; |
| 65 | static struct selinfo drvctl_rdsel; |
| 66 | |
| 67 | #define DRVCTL_EVENTQ_DEPTH 64 /* arbitrary queue limit */ |
| 68 | |
| 69 | dev_type_open(drvctlopen); |
| 70 | |
| 71 | const struct cdevsw drvctl_cdevsw = { |
| 72 | .d_open = drvctlopen, |
| 73 | .d_close = nullclose, |
| 74 | .d_read = nullread, |
| 75 | .d_write = nullwrite, |
| 76 | .d_ioctl = noioctl, |
| 77 | .d_stop = nostop, |
| 78 | .d_tty = notty, |
| 79 | .d_poll = nopoll, |
| 80 | .d_mmap = nommap, |
| 81 | .d_kqfilter = nokqfilter, |
| 82 | .d_discard = nodiscard, |
| 83 | .d_flag = D_OTHER |
| 84 | }; |
| 85 | |
| 86 | static int drvctl_read(struct file *, off_t *, struct uio *, |
| 87 | kauth_cred_t, int); |
| 88 | static int drvctl_write(struct file *, off_t *, struct uio *, |
| 89 | kauth_cred_t, int); |
| 90 | static int drvctl_ioctl(struct file *, u_long, void *); |
| 91 | static int drvctl_poll(struct file *, int); |
| 92 | static int drvctl_stat(struct file *, struct stat *); |
| 93 | static int drvctl_close(struct file *); |
| 94 | |
| 95 | static const struct fileops drvctl_fileops = { |
| 96 | .fo_read = drvctl_read, |
| 97 | .fo_write = drvctl_write, |
| 98 | .fo_ioctl = drvctl_ioctl, |
| 99 | .fo_fcntl = fnullop_fcntl, |
| 100 | .fo_poll = drvctl_poll, |
| 101 | .fo_stat = drvctl_stat, |
| 102 | .fo_close = drvctl_close, |
| 103 | .fo_kqfilter = fnullop_kqfilter, |
| 104 | .fo_restart = fnullop_restart, |
| 105 | }; |
| 106 | |
| 107 | #define MAXLOCATORS 100 |
| 108 | |
| 109 | extern int (*devmon_insert_vec)(const char *, prop_dictionary_t); |
| 110 | static int (*saved_insert_vec)(const char *, prop_dictionary_t) = NULL; |
| 111 | |
| 112 | static int drvctl_command(struct lwp *, struct plistref *, u_long, int); |
| 113 | static int drvctl_getevent(struct lwp *, struct plistref *, u_long, int); |
| 114 | |
| 115 | void |
| 116 | drvctl_init(void) |
| 117 | { |
| 118 | TAILQ_INIT(&drvctl_eventq); |
| 119 | mutex_init(&drvctl_lock, MUTEX_DEFAULT, IPL_NONE); |
| 120 | cv_init(&drvctl_cond, "devmon" ); |
| 121 | selinit(&drvctl_rdsel); |
| 122 | } |
| 123 | |
| 124 | void |
| 125 | drvctl_fini(void) |
| 126 | { |
| 127 | |
| 128 | seldestroy(&drvctl_rdsel); |
| 129 | cv_destroy(&drvctl_cond); |
| 130 | mutex_destroy(&drvctl_lock); |
| 131 | } |
| 132 | |
| 133 | int |
| 134 | devmon_insert(const char *event, prop_dictionary_t ev) |
| 135 | { |
| 136 | struct drvctl_event *dce, *odce; |
| 137 | |
| 138 | mutex_enter(&drvctl_lock); |
| 139 | |
| 140 | if (drvctl_nopen == 0) { |
| 141 | prop_object_release(ev); |
| 142 | mutex_exit(&drvctl_lock); |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | /* Fill in mandatory member */ |
| 147 | if (!prop_dictionary_set_cstring_nocopy(ev, "event" , event)) { |
| 148 | prop_object_release(ev); |
| 149 | mutex_exit(&drvctl_lock); |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | dce = kmem_alloc(sizeof(*dce), KM_SLEEP); |
| 154 | if (dce == NULL) { |
| 155 | prop_object_release(ev); |
| 156 | mutex_exit(&drvctl_lock); |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | dce->dce_event = ev; |
| 161 | |
| 162 | if (drvctl_eventcnt == DRVCTL_EVENTQ_DEPTH) { |
| 163 | odce = TAILQ_FIRST(&drvctl_eventq); |
| 164 | TAILQ_REMOVE(&drvctl_eventq, odce, dce_link); |
| 165 | prop_object_release(odce->dce_event); |
| 166 | kmem_free(odce, sizeof(*odce)); |
| 167 | --drvctl_eventcnt; |
| 168 | } |
| 169 | |
| 170 | TAILQ_INSERT_TAIL(&drvctl_eventq, dce, dce_link); |
| 171 | ++drvctl_eventcnt; |
| 172 | cv_broadcast(&drvctl_cond); |
| 173 | selnotify(&drvctl_rdsel, 0, 0); |
| 174 | |
| 175 | mutex_exit(&drvctl_lock); |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | int |
| 180 | drvctlopen(dev_t dev, int flags, int mode, struct lwp *l) |
| 181 | { |
| 182 | struct file *fp; |
| 183 | int fd; |
| 184 | int ret; |
| 185 | |
| 186 | ret = fd_allocfile(&fp, &fd); |
| 187 | if (ret) |
| 188 | return ret; |
| 189 | |
| 190 | /* XXX setup context */ |
| 191 | mutex_enter(&drvctl_lock); |
| 192 | ret = fd_clone(fp, fd, flags, &drvctl_fileops, /* context */NULL); |
| 193 | ++drvctl_nopen; |
| 194 | mutex_exit(&drvctl_lock); |
| 195 | |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | static int |
| 200 | pmdevbyname(u_long cmd, struct devpmargs *a) |
| 201 | { |
| 202 | device_t d; |
| 203 | |
| 204 | if ((d = device_find_by_xname(a->devname)) == NULL) |
| 205 | return ENXIO; |
| 206 | |
| 207 | switch (cmd) { |
| 208 | case DRVSUSPENDDEV: |
| 209 | return pmf_device_recursive_suspend(d, PMF_Q_DRVCTL) ? 0 : EBUSY; |
| 210 | case DRVRESUMEDEV: |
| 211 | if (a->flags & DEVPM_F_SUBTREE) { |
| 212 | return pmf_device_subtree_resume(d, PMF_Q_DRVCTL) |
| 213 | ? 0 : EBUSY; |
| 214 | } else { |
| 215 | return pmf_device_recursive_resume(d, PMF_Q_DRVCTL) |
| 216 | ? 0 : EBUSY; |
| 217 | } |
| 218 | default: |
| 219 | return EPASSTHROUGH; |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | static int |
| 224 | listdevbyname(struct devlistargs *l) |
| 225 | { |
| 226 | device_t d, child; |
| 227 | deviter_t di; |
| 228 | int cnt = 0, idx, error = 0; |
| 229 | |
| 230 | if (*l->l_devname == '\0') |
| 231 | d = NULL; |
| 232 | else if (memchr(l->l_devname, 0, sizeof(l->l_devname)) == NULL) |
| 233 | return EINVAL; |
| 234 | else if ((d = device_find_by_xname(l->l_devname)) == NULL) |
| 235 | return ENXIO; |
| 236 | |
| 237 | for (child = deviter_first(&di, 0); child != NULL; |
| 238 | child = deviter_next(&di)) { |
| 239 | if (device_parent(child) != d) |
| 240 | continue; |
| 241 | idx = cnt++; |
| 242 | if (l->l_childname == NULL || idx >= l->l_children) |
| 243 | continue; |
| 244 | error = copyoutstr(device_xname(child), l->l_childname[idx], |
| 245 | sizeof(l->l_childname[idx]), NULL); |
| 246 | if (error != 0) |
| 247 | break; |
| 248 | } |
| 249 | deviter_release(&di); |
| 250 | |
| 251 | l->l_children = cnt; |
| 252 | return error; |
| 253 | } |
| 254 | |
| 255 | static int |
| 256 | detachdevbyname(const char *devname) |
| 257 | { |
| 258 | device_t d; |
| 259 | |
| 260 | if ((d = device_find_by_xname(devname)) == NULL) |
| 261 | return ENXIO; |
| 262 | |
| 263 | #ifndef XXXFULLRISK |
| 264 | /* |
| 265 | * If the parent cannot be notified, it might keep |
| 266 | * pointers to the detached device. |
| 267 | * There might be a private notification mechanism, |
| 268 | * but better play it safe here. |
| 269 | */ |
| 270 | if (d->dv_parent && !d->dv_parent->dv_cfattach->ca_childdetached) |
| 271 | return ENOTSUP; |
| 272 | #endif |
| 273 | return config_detach(d, 0); |
| 274 | } |
| 275 | |
| 276 | static int |
| 277 | rescanbus(const char *busname, const char *ifattr, |
| 278 | int numlocators, const int *locators) |
| 279 | { |
| 280 | int i, rc; |
| 281 | device_t d; |
| 282 | const struct cfiattrdata * const *ap; |
| 283 | |
| 284 | /* XXX there should be a way to get limits and defaults (per device) |
| 285 | from config generated data */ |
| 286 | int locs[MAXLOCATORS]; |
| 287 | for (i = 0; i < MAXLOCATORS; i++) |
| 288 | locs[i] = -1; |
| 289 | |
| 290 | for (i = 0; i < numlocators;i++) |
| 291 | locs[i] = locators[i]; |
| 292 | |
| 293 | if ((d = device_find_by_xname(busname)) == NULL) |
| 294 | return ENXIO; |
| 295 | |
| 296 | /* |
| 297 | * must support rescan, and must have something |
| 298 | * to attach to |
| 299 | */ |
| 300 | if (!d->dv_cfattach->ca_rescan || |
| 301 | !d->dv_cfdriver->cd_attrs) |
| 302 | return ENODEV; |
| 303 | |
| 304 | /* allow to omit attribute if there is exactly one */ |
| 305 | if (!ifattr) { |
| 306 | if (d->dv_cfdriver->cd_attrs[1]) |
| 307 | return EINVAL; |
| 308 | ifattr = d->dv_cfdriver->cd_attrs[0]->ci_name; |
| 309 | } else { |
| 310 | /* check for valid attribute passed */ |
| 311 | for (ap = d->dv_cfdriver->cd_attrs; *ap; ap++) |
| 312 | if (!strcmp((*ap)->ci_name, ifattr)) |
| 313 | break; |
| 314 | if (!*ap) |
| 315 | return EINVAL; |
| 316 | } |
| 317 | |
| 318 | rc = (*d->dv_cfattach->ca_rescan)(d, ifattr, locs); |
| 319 | config_deferred(NULL); |
| 320 | return rc; |
| 321 | } |
| 322 | |
| 323 | static int |
| 324 | drvctl_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, |
| 325 | int flags) |
| 326 | { |
| 327 | return ENODEV; |
| 328 | } |
| 329 | |
| 330 | static int |
| 331 | drvctl_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, |
| 332 | int flags) |
| 333 | { |
| 334 | return ENODEV; |
| 335 | } |
| 336 | |
| 337 | static int |
| 338 | drvctl_ioctl(struct file *fp, u_long cmd, void *data) |
| 339 | { |
| 340 | int res; |
| 341 | char *ifattr; |
| 342 | int *locs; |
| 343 | size_t locs_sz = 0; /* XXXgcc */ |
| 344 | |
| 345 | switch (cmd) { |
| 346 | case DRVSUSPENDDEV: |
| 347 | case DRVRESUMEDEV: |
| 348 | #define d ((struct devpmargs *)data) |
| 349 | res = pmdevbyname(cmd, d); |
| 350 | #undef d |
| 351 | break; |
| 352 | case DRVLISTDEV: |
| 353 | res = listdevbyname((struct devlistargs *)data); |
| 354 | break; |
| 355 | case DRVDETACHDEV: |
| 356 | #define d ((struct devdetachargs *)data) |
| 357 | res = detachdevbyname(d->devname); |
| 358 | #undef d |
| 359 | break; |
| 360 | case DRVRESCANBUS: |
| 361 | #define d ((struct devrescanargs *)data) |
| 362 | d->busname[sizeof(d->busname) - 1] = '\0'; |
| 363 | |
| 364 | /* XXX better copyin? */ |
| 365 | if (d->ifattr[0]) { |
| 366 | d->ifattr[sizeof(d->ifattr) - 1] = '\0'; |
| 367 | ifattr = d->ifattr; |
| 368 | } else |
| 369 | ifattr = 0; |
| 370 | |
| 371 | if (d->numlocators) { |
| 372 | if (d->numlocators > MAXLOCATORS) |
| 373 | return EINVAL; |
| 374 | locs_sz = d->numlocators * sizeof(int); |
| 375 | locs = kmem_alloc(locs_sz, KM_SLEEP); |
| 376 | res = copyin(d->locators, locs, locs_sz); |
| 377 | if (res) { |
| 378 | kmem_free(locs, locs_sz); |
| 379 | return res; |
| 380 | } |
| 381 | } else |
| 382 | locs = NULL; |
| 383 | res = rescanbus(d->busname, ifattr, d->numlocators, locs); |
| 384 | if (locs) |
| 385 | kmem_free(locs, locs_sz); |
| 386 | #undef d |
| 387 | break; |
| 388 | case DRVCTLCOMMAND: |
| 389 | res = drvctl_command(curlwp, (struct plistref *)data, cmd, |
| 390 | fp->f_flag); |
| 391 | break; |
| 392 | case DRVGETEVENT: |
| 393 | res = drvctl_getevent(curlwp, (struct plistref *)data, cmd, |
| 394 | fp->f_flag); |
| 395 | break; |
| 396 | default: |
| 397 | return EPASSTHROUGH; |
| 398 | } |
| 399 | return res; |
| 400 | } |
| 401 | |
| 402 | static int |
| 403 | drvctl_stat(struct file *fp, struct stat *st) |
| 404 | { |
| 405 | (void)memset(st, 0, sizeof(*st)); |
| 406 | st->st_uid = kauth_cred_geteuid(fp->f_cred); |
| 407 | st->st_gid = kauth_cred_getegid(fp->f_cred); |
| 408 | return 0; |
| 409 | } |
| 410 | |
| 411 | static int |
| 412 | drvctl_poll(struct file *fp, int events) |
| 413 | { |
| 414 | int revents = 0; |
| 415 | |
| 416 | if (!TAILQ_EMPTY(&drvctl_eventq)) |
| 417 | revents |= events & (POLLIN | POLLRDNORM); |
| 418 | else |
| 419 | selrecord(curlwp, &drvctl_rdsel); |
| 420 | |
| 421 | return revents; |
| 422 | } |
| 423 | |
| 424 | static int |
| 425 | drvctl_close(struct file *fp) |
| 426 | { |
| 427 | struct drvctl_event *dce; |
| 428 | |
| 429 | /* XXX free context */ |
| 430 | mutex_enter(&drvctl_lock); |
| 431 | KASSERT(drvctl_nopen > 0); |
| 432 | --drvctl_nopen; |
| 433 | if (drvctl_nopen == 0) { |
| 434 | /* flush queue */ |
| 435 | while ((dce = TAILQ_FIRST(&drvctl_eventq)) != NULL) { |
| 436 | TAILQ_REMOVE(&drvctl_eventq, dce, dce_link); |
| 437 | KASSERT(drvctl_eventcnt > 0); |
| 438 | --drvctl_eventcnt; |
| 439 | prop_object_release(dce->dce_event); |
| 440 | kmem_free(dce, sizeof(*dce)); |
| 441 | } |
| 442 | } |
| 443 | mutex_exit(&drvctl_lock); |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | |
| 448 | void |
| 449 | drvctlattach(int arg __unused) |
| 450 | { |
| 451 | } |
| 452 | |
| 453 | /***************************************************************************** |
| 454 | * Driver control command processing engine |
| 455 | *****************************************************************************/ |
| 456 | |
| 457 | static int |
| 458 | drvctl_command_get_properties(struct lwp *l, |
| 459 | prop_dictionary_t command_dict, |
| 460 | prop_dictionary_t results_dict) |
| 461 | { |
| 462 | prop_dictionary_t args_dict; |
| 463 | prop_string_t devname_string; |
| 464 | device_t dev; |
| 465 | deviter_t di; |
| 466 | |
| 467 | args_dict = prop_dictionary_get(command_dict, "drvctl-arguments" ); |
| 468 | if (args_dict == NULL) |
| 469 | return EINVAL; |
| 470 | |
| 471 | devname_string = prop_dictionary_get(args_dict, "device-name" ); |
| 472 | if (devname_string == NULL) |
| 473 | return EINVAL; |
| 474 | |
| 475 | for (dev = deviter_first(&di, 0); dev != NULL; |
| 476 | dev = deviter_next(&di)) { |
| 477 | if (prop_string_equals_cstring(devname_string, |
| 478 | device_xname(dev))) { |
| 479 | prop_dictionary_set(results_dict, "drvctl-result-data" , |
| 480 | device_properties(dev)); |
| 481 | break; |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | deviter_release(&di); |
| 486 | |
| 487 | if (dev == NULL) |
| 488 | return ESRCH; |
| 489 | |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | struct drvctl_command_desc { |
| 494 | const char *dcd_name; /* command name */ |
| 495 | int (*dcd_func)(struct lwp *, /* handler function */ |
| 496 | prop_dictionary_t, |
| 497 | prop_dictionary_t); |
| 498 | int dcd_rw; /* read or write required */ |
| 499 | }; |
| 500 | |
| 501 | static const struct drvctl_command_desc drvctl_command_table[] = { |
| 502 | { .dcd_name = "get-properties" , |
| 503 | .dcd_func = drvctl_command_get_properties, |
| 504 | .dcd_rw = FREAD, |
| 505 | }, |
| 506 | |
| 507 | { .dcd_name = NULL } |
| 508 | }; |
| 509 | |
| 510 | static int |
| 511 | drvctl_command(struct lwp *l, struct plistref *pref, u_long ioctl_cmd, |
| 512 | int fflag) |
| 513 | { |
| 514 | prop_dictionary_t command_dict, results_dict; |
| 515 | prop_string_t command_string; |
| 516 | const struct drvctl_command_desc *dcd; |
| 517 | int error; |
| 518 | |
| 519 | error = prop_dictionary_copyin_ioctl(pref, ioctl_cmd, &command_dict); |
| 520 | if (error) |
| 521 | return error; |
| 522 | |
| 523 | results_dict = prop_dictionary_create(); |
| 524 | if (results_dict == NULL) { |
| 525 | prop_object_release(command_dict); |
| 526 | return ENOMEM; |
| 527 | } |
| 528 | |
| 529 | command_string = prop_dictionary_get(command_dict, "drvctl-command" ); |
| 530 | if (command_string == NULL) { |
| 531 | error = EINVAL; |
| 532 | goto out; |
| 533 | } |
| 534 | |
| 535 | for (dcd = drvctl_command_table; dcd->dcd_name != NULL; dcd++) { |
| 536 | if (prop_string_equals_cstring(command_string, |
| 537 | dcd->dcd_name)) |
| 538 | break; |
| 539 | } |
| 540 | |
| 541 | if (dcd->dcd_name == NULL) { |
| 542 | error = EINVAL; |
| 543 | goto out; |
| 544 | } |
| 545 | |
| 546 | if ((fflag & dcd->dcd_rw) == 0) { |
| 547 | error = EPERM; |
| 548 | goto out; |
| 549 | } |
| 550 | |
| 551 | error = (*dcd->dcd_func)(l, command_dict, results_dict); |
| 552 | |
| 553 | prop_dictionary_set_int32(results_dict, "drvctl-error" , error); |
| 554 | |
| 555 | error = prop_dictionary_copyout_ioctl(pref, ioctl_cmd, results_dict); |
| 556 | out: |
| 557 | prop_object_release(command_dict); |
| 558 | prop_object_release(results_dict); |
| 559 | return error; |
| 560 | } |
| 561 | |
| 562 | static int |
| 563 | drvctl_getevent(struct lwp *l, struct plistref *pref, u_long ioctl_cmd, |
| 564 | int fflag) |
| 565 | { |
| 566 | struct drvctl_event *dce; |
| 567 | int ret; |
| 568 | |
| 569 | if ((fflag & (FREAD|FWRITE)) != (FREAD|FWRITE)) |
| 570 | return EPERM; |
| 571 | |
| 572 | mutex_enter(&drvctl_lock); |
| 573 | while ((dce = TAILQ_FIRST(&drvctl_eventq)) == NULL) { |
| 574 | if (fflag & O_NONBLOCK) { |
| 575 | mutex_exit(&drvctl_lock); |
| 576 | return EWOULDBLOCK; |
| 577 | } |
| 578 | |
| 579 | ret = cv_wait_sig(&drvctl_cond, &drvctl_lock); |
| 580 | if (ret) { |
| 581 | mutex_exit(&drvctl_lock); |
| 582 | return ret; |
| 583 | } |
| 584 | } |
| 585 | TAILQ_REMOVE(&drvctl_eventq, dce, dce_link); |
| 586 | KASSERT(drvctl_eventcnt > 0); |
| 587 | --drvctl_eventcnt; |
| 588 | mutex_exit(&drvctl_lock); |
| 589 | |
| 590 | ret = prop_dictionary_copyout_ioctl(pref, ioctl_cmd, dce->dce_event); |
| 591 | |
| 592 | prop_object_release(dce->dce_event); |
| 593 | kmem_free(dce, sizeof(*dce)); |
| 594 | |
| 595 | return ret; |
| 596 | } |
| 597 | |
| 598 | /* |
| 599 | * Module glue |
| 600 | */ |
| 601 | |
| 602 | MODULE(MODULE_CLASS_DRIVER, drvctl, NULL); |
| 603 | |
| 604 | int |
| 605 | drvctl_modcmd(modcmd_t cmd, void *arg) |
| 606 | { |
| 607 | int error; |
| 608 | #ifdef _MODULE |
| 609 | int bmajor, cmajor; |
| 610 | #endif |
| 611 | |
| 612 | error = 0; |
| 613 | switch (cmd) { |
| 614 | case MODULE_CMD_INIT: |
| 615 | drvctl_init(); |
| 616 | |
| 617 | mutex_enter(&drvctl_lock); |
| 618 | #ifdef _MODULE |
| 619 | bmajor = cmajor = -1; |
| 620 | error = devsw_attach("drvctl" , NULL, &bmajor, |
| 621 | &drvctl_cdevsw, &cmajor); |
| 622 | #endif |
| 623 | if (error == 0) { |
| 624 | KASSERT(saved_insert_vec == NULL); |
| 625 | saved_insert_vec = devmon_insert_vec; |
| 626 | devmon_insert_vec = devmon_insert; |
| 627 | } |
| 628 | |
| 629 | mutex_exit(&drvctl_lock); |
| 630 | break; |
| 631 | |
| 632 | case MODULE_CMD_FINI: |
| 633 | mutex_enter(&drvctl_lock); |
| 634 | if (drvctl_nopen != 0 || drvctl_eventcnt != 0 ) { |
| 635 | mutex_exit(&drvctl_lock); |
| 636 | return EBUSY; |
| 637 | } |
| 638 | KASSERT(saved_insert_vec != NULL); |
| 639 | devmon_insert_vec = saved_insert_vec; |
| 640 | saved_insert_vec = NULL; |
| 641 | #ifdef _MODULE |
| 642 | error = devsw_detach(NULL, &drvctl_cdevsw); |
| 643 | if (error != 0) { |
| 644 | saved_insert_vec = devmon_insert_vec; |
| 645 | devmon_insert_vec = devmon_insert; |
| 646 | } |
| 647 | #endif |
| 648 | mutex_exit(&drvctl_lock); |
| 649 | if (error == 0) |
| 650 | drvctl_fini(); |
| 651 | |
| 652 | break; |
| 653 | default: |
| 654 | error = ENOTTY; |
| 655 | break; |
| 656 | } |
| 657 | |
| 658 | return error; |
| 659 | } |
| 660 | |