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Merge commit '008b34be09d7b9c3e7a18d3ce9ef8b5c4f4ff8b8'
[unleashed.git] / kernel / fs / dev / sdev_comm.c
blobb70803df4b399320d8e00a08212a774a936e5d12
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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25
26 /*
27 * routines to invoke user level name lookup services
28 */
29
30 #include <sys/types.h>
31 #include <sys/param.h>
32 #include <sys/t_lock.h>
33 #include <sys/systm.h>
34 #include <sys/sysmacros.h>
35 #include <sys/user.h>
36 #include <sys/time.h>
37 #include <sys/vfs.h>
38 #include <sys/vnode.h>
39 #include <sys/file.h>
40 #include <sys/fcntl.h>
41 #include <sys/flock.h>
42 #include <sys/kmem.h>
43 #include <sys/uio.h>
44 #include <sys/errno.h>
45 #include <sys/stat.h>
46 #include <sys/cred.h>
47 #include <sys/dirent.h>
48 #include <sys/pathname.h>
49 #include <sys/cmn_err.h>
50 #include <sys/debug.h>
51 #include <sys/mode.h>
52 #include <sys/policy.h>
53 #include <sys/disp.h>
54 #include <sys/door.h>
55 #include <sys/fs_subr.h>
56 #include <sys/mount.h>
57 #include <sys/fs/snode.h>
58 #include <sys/fs/dv_node.h>
59 #include <sys/fs/sdev_impl.h>
60 #include <sys/sunndi.h>
61 #include <sys/sunddi.h>
62 #include <sys/sunmdi.h>
63 #include <sys/conf.h>
64 #include <sys/modctl.h>
65 #include <sys/ddi.h>
66
67 /* default timeout to wait for devfsadm response in seconds */
68 #define DEV_DEVFSADM_STARTUP (1 * 60)
69 #define DEV_NODE_WAIT_TIMEOUT (5 * 60)
70
71 /* atomic bitset for devfsadm status */
72 volatile uint_t devfsadm_state;
73
74 static kmutex_t devfsadm_lock;
75 static kcondvar_t devfsadm_cv;
76
77 static int dev_node_wait_timeout = DEV_NODE_WAIT_TIMEOUT;
78 static int dev_devfsadm_startup = DEV_DEVFSADM_STARTUP;
79
80 /*
81 * Door used to communicate with devfsadmd
82 */
83 static door_handle_t sdev_upcall_door = NULL; /* Door for upcalls */
84 static char *sdev_door_upcall_filename = NULL;
85 static int sdev_upcall_door_revoked = 0;
86 static int sdev_door_upcall_filename_size;
87
88 static int sdev_devfsadm_revoked(void);
89 static int sdev_ki_call_devfsadmd(sdev_door_arg_t *, sdev_door_res_t *);
90
91 void
92 sdev_devfsadm_lockinit(void)
93 {
94 mutex_init(&devfsadm_lock, NULL, MUTEX_DEFAULT, NULL);
95 cv_init(&devfsadm_cv, NULL, CV_DEFAULT, NULL);
96 }
97
98 void
99 sdev_devfsadm_lockdestroy(void)
100 {
101 mutex_destroy(&devfsadm_lock);
102 cv_destroy(&devfsadm_cv);
103 }
104
105 /*
106 * Wait for node to be created
107 */
108 int
109 sdev_wait4lookup(struct sdev_node *dv, int cmd)
110 {
111 clock_t expire;
112 clock_t rv;
113 clock_t wakeup = drv_usectohz(2 * 1000000);
114 int rval = ENOENT;
115 int is_lookup = (cmd == SDEV_LOOKUP);
116
117 ASSERT(cmd == SDEV_LOOKUP || cmd == SDEV_READDIR);
118 ASSERT(MUTEX_HELD(&dv->sdev_lookup_lock));
119
120 /* tick value at which wait expires */
121 expire = ddi_get_lbolt() +
122 drv_usectohz(dev_node_wait_timeout * 1000000);
123
124 sdcmn_err6(("wait4lookup %s %s, %ld %d\n",
125 is_lookup ? "lookup" : "readdir",
126 dv->sdev_name, expire - ddi_get_lbolt(), dv->sdev_state));
127
128 if (SDEV_IS_LGWAITING(dv)) {
129 /* devfsadm nodes */
130 while (DEVNAME_DEVFSADM_IS_RUNNING(devfsadm_state) &&
131 !sdev_devfsadm_revoked()) {
132 /* wait 2 sec and check devfsadm completion */
133 rv = cv_reltimedwait_sig(&dv->sdev_lookup_cv,
134 &dv->sdev_lookup_lock, wakeup, TR_CLOCK_TICK);
135
136 if (is_lookup && (rv > 0)) {
137 /* was this node constructed ? */
138 if (dv->sdev_state == SDEV_READY) {
139 rval = 0;
140 }
141 sdcmn_err6(("%s: wait done, %screated %d\n",
142 dv->sdev_name, rval ? "not " : "",
143 dv->sdev_state));
144 break;
145 } else if (rv == 0) {
146 /* interrupted */
147 sdcmn_err6(("%s: wait interrupted\n",
148 dv->sdev_name));
149 break;
150 } else if ((rv == -1) &&
151 (ddi_get_lbolt() >= expire)) {
152 sdcmn_err6(("%s: wait time is up\n",
153 dv->sdev_name));
154 break;
155 }
156 sdcmn_err6(("%s: wait "
157 "rv %ld state 0x%x expire %ld\n",
158 dv->sdev_name, rv, devfsadm_state,
159 expire - ddi_get_lbolt()));
160 }
161 } else {
162 /*
163 * for the nodes created by
164 * devname_lookup_func callback
165 * or plug-in modules
166 */
167 while (SDEV_IS_LOOKUP(dv) || SDEV_IS_READDIR(dv)) {
168 cv_wait(&dv->sdev_lookup_cv, &dv->sdev_lookup_lock);
169 }
170 rval = 0;
171 }
172
173 sdcmn_err6(("wait4lookup unblocking %s state 0x%x %d\n",
174 dv->sdev_name, devfsadm_state, dv->sdev_state));
175
176 if (is_lookup) {
177 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP);
178 } else {
179 SDEV_UNBLOCK_OTHERS(dv, SDEV_READDIR);
180 }
181
182 return (rval);
183 }
184
185 void
186 sdev_unblock_others(struct sdev_node *dv, uint_t cmd)
187 {
188 ASSERT(MUTEX_HELD(&dv->sdev_lookup_lock));
189
190 SDEV_CLEAR_LOOKUP_FLAGS(dv, cmd);
191 if (SDEV_IS_LGWAITING(dv)) {
192 SDEV_CLEAR_LOOKUP_FLAGS(dv, SDEV_LGWAITING);
193 }
194 cv_broadcast(&dv->sdev_lookup_cv);
195 }
196
197 /*
198 * In the case devfsadmd is down, it is re-started by syseventd
199 * upon receiving an event subscribed to by devfsadmd.
200 */
201 static int
202 sdev_start_devfsadmd()
203 {
204 int se_err = 0;
205 sysevent_t *ev;
206 sysevent_id_t eid;
207
208 ev = sysevent_alloc(EC_DEVFS, ESC_DEVFS_START, EP_DDI, SE_SLEEP);
209 ASSERT(ev);
210 if ((se_err = log_sysevent(ev, SE_SLEEP, &eid)) != 0) {
211 switch (se_err) {
212 case SE_NO_TRANSPORT:
213 cmn_err(CE_WARN, "unable to start devfsadm - "
214 "syseventd may not be responding\n");
215 break;
216 default:
217 cmn_err(CE_WARN, "unable to start devfsadm - "
218 "sysevent error %d\n", se_err);
219 break;
220 }
221 }
222
223 sysevent_free(ev);
224 return (se_err);
225 }
226
227 static int
228 sdev_open_upcall_door()
229 {
230 int error;
231 clock_t rv;
232 clock_t expire;
233
234 ASSERT(sdev_upcall_door == NULL);
235
236 /* timeout expires this many ticks in the future */
237 expire = ddi_get_lbolt() + drv_usectohz(dev_devfsadm_startup * 1000000);
238
239 if (sdev_door_upcall_filename == NULL) {
240 if ((error = sdev_start_devfsadmd()) != 0) {
241 return (error);
242 }
243
244 /* wait for devfsadmd start */
245 mutex_enter(&devfsadm_lock);
246 while (sdev_door_upcall_filename == NULL) {
247 sdcmn_err6(("waiting for dev_door creation, %ld\n",
248 expire - ddi_get_lbolt()));
249 rv = cv_timedwait_sig(&devfsadm_cv, &devfsadm_lock,
250 expire);
251 sdcmn_err6(("dev_door wait rv %ld\n", rv));
252 if (rv <= 0) {
253 sdcmn_err6(("devfsadmd startup error\n"));
254 mutex_exit(&devfsadm_lock);
255 return (EBADF);
256 }
257 }
258 sdcmn_err6(("devfsadmd is ready\n"));
259 mutex_exit(&devfsadm_lock);
260 }
261
262 if ((error = door_ki_open(sdev_door_upcall_filename,
263 &sdev_upcall_door)) != 0) {
264 sdcmn_err6(("upcall_lookup: door open error %d\n",
265 error));
266 return (error);
267 }
268
269 return (0);
270 }
271
272 static void
273 sdev_release_door()
274 {
275 if (sdev_upcall_door) {
276 door_ki_rele(sdev_upcall_door);
277 sdev_upcall_door = NULL;
278 }
279 if (sdev_door_upcall_filename) {
280 kmem_free(sdev_door_upcall_filename,
281 sdev_door_upcall_filename_size);
282 sdev_door_upcall_filename = NULL;
283 }
284 }
285
286 static int
287 sdev_ki_call_devfsadmd(sdev_door_arg_t *argp, sdev_door_res_t *resultp)
288 {
289 door_arg_t darg, save_arg;
290 int error;
291 int retry;
292
293 if (((sdev_upcall_door == NULL) &&
294 ((error = sdev_open_upcall_door()) != 0)) ||
295 sdev_devfsadm_revoked()) {
296 sdcmn_err6(("call_devfsadm: upcall lookup error\n"));
297 return (error);
298 }
299
300 ASSERT(argp);
301 darg.data_ptr = (char *)argp;
302 darg.data_size = sizeof (struct sdev_door_arg);
303 darg.desc_ptr = NULL;
304 darg.desc_num = 0;
305 darg.rbuf = (char *)(resultp);
306 darg.rsize = sizeof (struct sdev_door_res);
307
308 ASSERT(sdev_upcall_door);
309 save_arg = darg;
310 for (retry = 0; ; retry++) {
311 sdcmn_err6(("call devfsadm: upcall lookup, retry %d\n", retry));
312 if ((error = door_ki_upcall_limited(sdev_upcall_door, &darg,
313 NULL, SIZE_MAX, 0)) == 0) {
314 sdcmn_err6(("call devfsadm: upcall lookup ok\n"));
315 break;
316 }
317
318 /*
319 * handle door call errors
320 */
321 if (sdev_devfsadm_revoked()) {
322 sdcmn_err6(("upcall lookup door revoked, "
323 "error %d\n", error));
324 return (error);
325 }
326
327 switch (error) {
328 case EINTR:
329 /* return error here? */
330 sdcmn_err6(("sdev_ki_call_devfsadm: EINTR\n"));
331 ddi_sleep(1);
332 break;
333 case EAGAIN:
334 sdcmn_err6(("sdev_ki_call_devfsadm: EAGAIN\n"));
335 ddi_sleep(2);
336 break;
337 case EBADF:
338 if (retry > 4) {
339 sdcmn_err6(("sdev_ki_call_devfsadm: EBADF\n"));
340 return (EBADF);
341 }
342 sdcmn_err6((
343 "sdev_ki_call_devfsadm: EBADF, re-binding\n"));
344 sdev_release_door();
345 ddi_sleep(retry);
346 error = sdev_open_upcall_door();
347 if (error != 0) {
348 sdcmn_err6(("sdev_ki_call_devfsadm: "
349 "EBADF lookup error %d\n", error));
350 if (!sdev_devfsadm_revoked())
351 cmn_err(CE_NOTE,
352 "?unable to invoke devfsadm - "
353 "please run manually\n");
354 return (EBADF);
355 }
356 break;
357 case EINVAL:
358 default:
359 cmn_err(CE_CONT,
360 "?sdev: door_ki_upcall unexpected result %d\n",
361 error);
362 return (error);
363 }
364
365 darg = save_arg;
366 }
367
368 if (!error) {
369 ASSERT((struct sdev_door_res *)(intptr_t)darg.rbuf == resultp);
370 if (resultp->devfsadm_error != 0) {
371 sdcmn_err6(("sdev_ki_call_devfsadmd: result %d\n",
372 resultp->devfsadm_error));
373 error = resultp->devfsadm_error;
374 }
375 } else {
376 sdcmn_err6(("sdev_ki_call_devfsadmd with error %d\n", error));
377 }
378
379 return (error);
380 }
381
382 static int
383 sdev_devfsadm_revoked(void)
384 {
385 struct door_info info;
386 int rv;
387 extern int sys_shutdown;
388
389 if (sys_shutdown) {
390 sdcmn_err6(("dev: shutdown observed\n"));
391 return (1);
392 }
393
394 if (sdev_upcall_door && !sdev_upcall_door_revoked) {
395 rv = door_ki_info(sdev_upcall_door, &info);
396 if ((rv == 0) && info.di_attributes & DOOR_REVOKED) {
397 sdcmn_err6(("lookup door: revoked\n"));
398 sdev_upcall_door_revoked = 1;
399 }
400 }
401
402 return (sdev_upcall_door_revoked);
403 }
404
405 /*ARGSUSED*/
406 static void
407 sdev_config_all_thread(struct sdev_node *dv)
408 {
409 int32_t error = 0;
410 sdev_door_arg_t *argp;
411 sdev_door_res_t result;
412
413 argp = kmem_zalloc(sizeof (sdev_door_arg_t), KM_SLEEP);
414 argp->devfsadm_cmd = DEVFSADMD_RUN_ALL;
415
416 error = sdev_ki_call_devfsadmd(argp, &result);
417 if (!error) {
418 sdcmn_err6(("devfsadm result error: %d\n",
419 result.devfsadm_error));
420 if (!result.devfsadm_error) {
421 DEVNAME_DEVFSADM_SET_RUN(devfsadm_state);
422 } else {
423 DEVNAME_DEVFSADM_SET_STOP(devfsadm_state);
424 }
425 } else {
426 DEVNAME_DEVFSADM_SET_STOP(devfsadm_state);
427 }
428
429 kmem_free(argp, sizeof (sdev_door_arg_t));
430 done:
431 sdcmn_err6(("sdev_config_all_thread: stopping, devfsadm state 0x%x\n",
432 devfsadm_state));
433 thread_exit();
434 }
435
436 /*
437 * launch an asynchronous thread to do the devfsadm dev_config_all
438 */
439 /*ARGSUSED*/
440 void
441 sdev_devfsadmd_thread(struct sdev_node *ddv, struct sdev_node *dv,
442 struct cred *cred)
443 {
444 ASSERT(i_ddi_io_initialized());
445 DEVNAME_DEVFSADM_SET_RUNNING(devfsadm_state);
446 (void) thread_create(NULL, 0, sdev_config_all_thread, dv, 0,
447 &p0, TS_RUN, MINCLSYSPRI);
448 }
449
450 int
451 devname_filename_register(char *name)
452 {
453 int error = 0;
454 char *strbuf;
455 char *namep;
456 int n;
457
458 strbuf = kmem_zalloc(MOD_MAXPATH, KM_SLEEP);
459
460 if (copyinstr(name, strbuf, MOD_MAXPATH, 0)) {
461 sdcmn_err6(("error copyin \n"));
462 error = EFAULT;
463 } else {
464 sdcmn_err6(("file %s is registering\n", strbuf));
465 /* handling the daemon re-start situations */
466 n = strlen(strbuf) + 1;
467 namep = i_ddi_strdup(strbuf, KM_SLEEP);
468 mutex_enter(&devfsadm_lock);
469 sdev_release_door();
470 sdev_door_upcall_filename_size = n;
471 sdev_door_upcall_filename = namep;
472 sdcmn_err6(("size %d file name %s\n",
473 sdev_door_upcall_filename_size,
474 sdev_door_upcall_filename));
475 cv_broadcast(&devfsadm_cv);
476 mutex_exit(&devfsadm_lock);
477 }
478
479 kmem_free(strbuf, MOD_MAXPATH);
480 return (error);
481 }
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