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--- old/usr/src/uts/common/io/cons.c
+++ new/usr/src/uts/common/io/cons.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 1982, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 * Copyright 2015, Joyent, Inc. All rights reserved.
25 25 */
26 26
27 27 /*
28 28 * Indirect console driver for Sun.
29 29 *
30 30 * Redirects all I/O to the device designated as the underlying "hardware"
31 31 * console, as given by the value of rconsvp. The implementation assumes that
32 32 * rconsvp denotes a STREAMS device; the assumption is justified since
33 33 * consoles must be capable of effecting tty semantics.
34 34 *
35 35 * rconsvp is set in autoconf.c:consconfig(), based on information obtained
36 36 * from the EEPROM.
37 37 *
38 38 * XXX: The driver still needs to be converted to use ANSI C consistently
39 39 * throughout.
40 40 */
41 41
42 42 #include <sys/types.h>
43 43 #include <sys/open.h>
44 44 #include <sys/param.h>
45 45 #include <sys/systm.h>
46 46 #include <sys/signal.h>
47 47 #include <sys/cred.h>
48 48 #include <sys/user.h>
49 49 #include <sys/proc.h>
50 50 #include <sys/disp.h>
51 51 #include <sys/file.h>
52 52 #include <sys/taskq.h>
53 53 #include <sys/log.h>
54 54 #include <sys/vnode.h>
55 55 #include <sys/uio.h>
56 56 #include <sys/stat.h>
57 57 #include <sys/limits.h>
58 58
59 59 #include <sys/console.h>
60 60 #include <sys/consdev.h>
61 61
62 62 #include <sys/stream.h>
63 63 #include <sys/strsubr.h>
64 64 #include <sys/poll.h>
65 65
66 66 #include <sys/debug.h>
67 67
68 68 #include <sys/conf.h>
69 69 #include <sys/ddi.h>
70 70 #include <sys/sunddi.h>
71 71 #include <sys/vt.h>
72 72
73 73 static int cnopen(dev_t *, int, int, struct cred *);
74 74 static int cnclose(dev_t, int, int, struct cred *);
75 75 static int cnread(dev_t, struct uio *, struct cred *);
76 76 static int cnwrite(dev_t, struct uio *, struct cred *);
77 77 static int cnioctl(dev_t, int, intptr_t, int, struct cred *, int *);
78 78 static int cnpoll(dev_t, short, int, short *, struct pollhead **);
79 79 static int cn_info(dev_info_t *, ddi_info_cmd_t, void *, void **);
80 80 static int cn_attach(dev_info_t *, ddi_attach_cmd_t);
81 81 static int cn_detach(dev_info_t *, ddi_detach_cmd_t);
82 82
83 83 static dev_info_t *cn_dip; /* private copy of devinfo pointer */
84 84
85 85 static struct cb_ops cn_cb_ops = {
86 86
87 87 cnopen, /* open */
88 88 cnclose, /* close */
89 89 nodev, /* strategy */
90 90 nodev, /* print */
91 91 nodev, /* dump */
92 92 cnread, /* read */
93 93 cnwrite, /* write */
94 94 cnioctl, /* ioctl */
95 95 nodev, /* devmap */
96 96 nodev, /* mmap */
97 97 nodev, /* segmap */
98 98 cnpoll, /* poll */
99 99 ddi_prop_op, /* cb_prop_op */
100 100 0, /* streamtab */
101 101 D_NEW | D_MP /* Driver compatibility flag */
102 102
103 103 };
104 104
105 105 static struct dev_ops cn_ops = {
106 106
107 107 DEVO_REV, /* devo_rev, */
108 108 0, /* refcnt */
109 109 cn_info, /* info */
110 110 nulldev, /* identify */
111 111 nulldev, /* probe */
112 112 cn_attach, /* attach */
113 113 cn_detach, /* detach */
114 114 nodev, /* reset */
115 115 &cn_cb_ops, /* driver operations */
116 116 (struct bus_ops *)0, /* bus operations */
117 117 NULL, /* power */
118 118 ddi_quiesce_not_needed, /* quiesce */
119 119
120 120 };
121 121
122 122 /*
123 123 * Global variables associated with the console device:
124 124 *
125 125 * XXX: There are too many of these!
126 126 * moved to space.c to become resident in the kernel so that cons
127 127 * can be loadable.
128 128 */
129 129
130 130 extern dev_t rconsdev; /* "hardware" console */
131 131 extern vnode_t *rconsvp; /* pointer to vnode for that device */
132 132
133 133 /*
134 134 * XXX: consulted in prsubr.c, for /proc entry point for obtaining ps info.
135 135 */
136 136 extern dev_t uconsdev; /* What the user thinks is the console device */
137 137
138 138 /*
139 139 * Private driver state:
140 140 */
141 141
142 142 /*
143 143 * The underlying console device potentially can be opened through (at least)
144 144 * two paths: through this driver and through the underlying device's driver.
145 145 * To ensure that reference counts are meaningful and therefore that close
146 146 * routines are called at the right time, it's important to make sure that
147 147 * rconsvp's s_count field (i.e., the count on the underlying device) never
148 148 * has a contribution of more than one through this driver, regardless of how
149 149 * many times this driver's been opened. rconsopen keeps track of the
150 150 * necessary information to ensure this property.
151 151 */
152 152 static uint_t rconsopen;
153 153
154 154
155 155 #include <sys/types.h>
156 156 #include <sys/conf.h>
157 157 #include <sys/param.h>
158 158 #include <sys/systm.h>
159 159 #include <sys/errno.h>
160 160 #include <sys/modctl.h>
161 161
162 162
163 163 extern int nodev(), nulldev();
164 164 extern int dseekneg_flag;
165 165 extern struct mod_ops mod_driverops;
166 166 extern struct dev_ops cn_ops;
167 167
168 168 /*
169 169 * Module linkage information for the kernel.
170 170 */
171 171
172 172 static struct modldrv modldrv = {
173 173 &mod_driverops, /* Type of module. This one is a pseudo driver */
174 174 "Console redirection driver",
175 175 &cn_ops, /* driver ops */
176 176 };
177 177
178 178 static struct modlinkage modlinkage = {
179 179 MODREV_1,
180 180 &modldrv,
181 181 NULL
182 182 };
183 183
184 184 int
185 185 _init(void)
186 186 {
187 187 return (mod_install(&modlinkage));
188 188 }
189 189
190 190 int
191 191 _fini(void)
192 192 {
193 193 return (EBUSY);
194 194 }
195 195
196 196 int
197 197 _info(struct modinfo *modinfop)
198 198 {
199 199 return (mod_info(&modlinkage, modinfop));
200 200 }
201 201
202 202 /*
203 203 * DDI glue routines
204 204 */
205 205 static int
206 206 cn_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
207 207 {
208 208 if (cmd != DDI_ATTACH)
209 209 return (DDI_FAILURE);
210 210
211 211 if (ddi_create_minor_node(devi, "syscon", S_IFCHR,
212 212 0, DDI_PSEUDO, NULL) == DDI_FAILURE) {
213 213 return (DDI_FAILURE);
214 214 }
215 215 if (ddi_create_minor_node(devi, "systty", S_IFCHR,
216 216 0, DDI_PSEUDO, NULL) == DDI_FAILURE) {
217 217 ddi_remove_minor_node(devi, NULL);
218 218 return (DDI_FAILURE);
219 219 }
220 220 if (ddi_create_minor_node(devi, "console", S_IFCHR,
221 221 0, DDI_PSEUDO, NULL) == DDI_FAILURE) {
222 222 ddi_remove_minor_node(devi, NULL);
223 223 return (DDI_FAILURE);
224 224 }
225 225
226 226 cn_dip = devi;
227 227 return (DDI_SUCCESS);
228 228 }
229 229
230 230 static int
231 231 cn_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
232 232 {
233 233 if (cmd != DDI_DETACH)
234 234 return (DDI_FAILURE);
235 235 ddi_remove_minor_node(devi, NULL);
236 236 uconsdev = NODEV;
237 237 return (DDI_SUCCESS);
238 238 }
239 239
240 240 /* ARGSUSED */
241 241 static int
242 242 cn_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
243 243 {
244 244 int error = DDI_FAILURE;
245 245
246 246 switch (infocmd) {
247 247 case DDI_INFO_DEVT2DEVINFO:
248 248 if (getminor((dev_t)arg) == 0 && cn_dip != NULL) {
249 249 *result = (void *) cn_dip;
250 250 error = DDI_SUCCESS;
251 251 }
252 252 break;
253 253
254 254 case DDI_INFO_DEVT2INSTANCE:
255 255 if (getminor((dev_t)arg) == 0) {
256 256 *result = (void *)0;
257 257 error = DDI_SUCCESS;
258 258 }
259 259 break;
260 260
261 261 default:
262 262 break;
263 263 }
264 264
265 265 return (error);
266 266 }
267 267
268 268 /*
269 269 * XXX Caution: before allowing more than 256 minor devices on the
270 270 * console, make sure you understand the 'compatibility' hack
271 271 * in ufs_iget() that translates old dev_t's to new dev_t's.
272 272 * See bugid 1098104 for the sordid details.
273 273 */
274 274
275 275 /* ARGSUSED */
276 276 static int
277 277 cnopen(dev_t *dev, int flag, int state, struct cred *cred)
278 278 {
279 279 int err;
280 280 static int been_here;
281 281 vnode_t *vp = rconsvp;
282 282
283 283 ASSERT(cred != NULL);
284 284
285 285 if (rconsvp == NULL)
286 286 return (0);
287 287
288 288 /*
289 289 * Enable virtual console I/O for console logging if needed.
290 290 */
291 291 if (vsconsvp != NULL && vsconsvp->v_stream == NULL) {
292 292 if (VOP_OPEN(&vsconsvp, FREAD | FWRITE, cred, NULL) != 0) {
293 293 cmn_err(CE_WARN, "cnopen: failed to open vsconsvp "
294 294 "for virtual console logging");
295 295 }
296 296 }
297 297
298 298 /*
299 299 * XXX: Clean up inactive PIDs from previous opens if any.
300 300 * These would have been created as a result of an I_SETSIG
301 301 * issued against console. This is a workaround, and
302 302 * console driver must be correctly redesigned not to need
303 303 * this hook.
304 304 */
305 305 if (vp->v_stream) {
306 306 str_cn_clean(vp);
307 307 }
308 308
309 309 /*
310 310 * XXX: Set hook to tell /proc about underlying console. (There's
311 311 * gotta be a better way...)
312 312 */
313 313 if (state != OTYP_CHR || getminor(*dev) != 0)
314 314 return (ENXIO);
315 315 if (been_here == 0) {
316 316 uconsdev = *dev;
317 317 been_here = 1;
318 318 if (vn_open("/dev/console", UIO_SYSSPACE, FWRITE | FNOCTTY,
319 319 0, &console_vnode, 0, 0) == 0)
320 320 console_taskq = taskq_create("console_taskq",
321 321 1, maxclsyspri - 1, LOG_LOWAT / LOG_MSGSIZE,
322 322 LOG_HIWAT / LOG_MSGSIZE, TASKQ_PREPOPULATE);
323 323 }
324 324
325 325 if ((err = VOP_OPEN(&vp, flag, cred, NULL)) != 0)
326 326 return (err);
327 327
328 328 /*
329 329 * The underlying driver is not allowed to have cloned itself
330 330 * for this open.
331 331 */
332 332 if (vp != rconsvp) {
333 333 /*
334 334 * It might happen that someone set rconsvp to NULL
335 335 * whilst we were in the middle of the open.
336 336 */
337 337 if (rconsvp == NULL) {
338 338 (void) VOP_CLOSE(vp, flag, 1, (offset_t)0, cred, NULL);
339 339 return (0);
340 340 }
341 341 cmn_err(CE_PANIC, "cnopen: cloned open");
342 342 }
343 343
344 344 rconsopen++;
345 345
346 346 return (0);
347 347 }
348 348
349 349 /* ARGSUSED */
350 350 static int
351 351 cnclose(dev_t dev, int flag, int state, struct cred *cred)
352 352 {
353 353 int err = 0;
354 354 vnode_t *vp;
355 355
356 356 /*
357 357 * Since this is the _last_ close, it's our last chance to close the
358 358 * underlying device. (Note that if someone else has the underlying
359 359 * hardware console device open, we won't get here, since spec_close
360 360 * will see s_count > 1.)
361 361 */
362 362 if (state != OTYP_CHR)
363 363 return (ENXIO);
364 364
365 365 if (rconsvp == NULL)
366 366 return (0);
367 367
368 368 while ((rconsopen != 0) && ((vp = rconsvp) != NULL)) {
369 369 err = VOP_CLOSE(vp, flag, 1, (offset_t)0, cred, NULL);
370 370 if (!err) {
371 371 rconsopen--;
372 372 }
373 373 }
374 374 return (err);
375 375 }
376 376
377 377 /* ARGSUSED */
378 378 static int
379 379 cnread(dev_t dev, struct uio *uio, struct cred *cred)
380 380 {
381 381 kcondvar_t sleep_forever;
382 382 kmutex_t sleep_forever_mutex;
383 383
384 384 if (rconsvp == NULL) {
385 385 /*
386 386 * Go to sleep forever. This seems like the least
387 387 * harmful thing to do if there's no console.
388 388 * EOF might be better if we're ending up single-user
389 389 * mode.
390 390 */
391 391 cv_init(&sleep_forever, NULL, CV_DRIVER, NULL);
392 392 mutex_init(&sleep_forever_mutex, NULL, MUTEX_DRIVER, NULL);
393 393 mutex_enter(&sleep_forever_mutex);
394 394 (void) cv_wait_sig(&sleep_forever, &sleep_forever_mutex);
395 395 mutex_exit(&sleep_forever_mutex);
396 396 return (EIO);
397 397 }
398 398
399 399 if (rconsvp->v_stream != NULL)
400 400 return (strread(rconsvp, uio, cred));
401 401 else
402 402 return (cdev_read(rconsdev, uio, cred));
403 403 }
404 404
405 405 /* ARGSUSED */
406 406 static int
407 407 cnwrite(dev_t dev, struct uio *uio, struct cred *cred)
408 408 {
409 409 if (rconsvp == NULL) {
410 410 uio->uio_resid = 0;
411 411 return (0);
412 412 }
413 413
414 414 /*
415 415 * Output to virtual console for logging if enabled.
416 416 */
417 417 if (vsconsvp != NULL && vsconsvp->v_stream != NULL) {
418 418 struiod_t uiod;
419 419 struct iovec buf[IOV_MAX_STACK];
420 420 int iovlen = 0;
421 421
422 422 if (uio->uio_iovcnt > IOV_MAX_STACK) {
423 423 iovlen = uio->uio_iovcnt * sizeof (iovec_t);
424 424 uiod.d_iov = kmem_alloc(iovlen, KM_SLEEP);
425 425 } else {
426 426 uiod.d_iov = buf;
427 427 }
428 428
429 429 /*
430 430 * strwrite modifies uio so need to make copy.
431 431 */
432 432 (void) uiodup(uio, &uiod.d_uio, uiod.d_iov, uio->uio_iovcnt);
433 433
434 434 (void) strwrite(vsconsvp, &uiod.d_uio, cred);
435 435 if (iovlen != 0)
436 436 kmem_free(uiod.d_iov, iovlen);
437 437 }
438 438
439 439 if (rconsvp->v_stream != NULL)
440 440 return (strwrite(rconsvp, uio, cred));
441 441 else
442 442 return (cdev_write(rconsdev, uio, cred));
443 443 }
444 444
445 445 /* ARGSUSED */
446 446 static int
447 447 cnprivateioc(dev_t dev, int cmd, intptr_t arg, int flag, struct cred *cred,
448 448 int *rvalp)
449 449 {
450 450
451 451 /* currently we only support one ioctl */
452 452 if (cmd != CONS_GETTERM)
453 453 return (EINVAL);
454 454
455 455 /* Confirm iwscn is immediate target of cn redirection */
456 456 if (rconsvp != wsconsvp)
457 457 return (ENODEV);
458 458
459 459 /*
460 460 * If the redirection client is not wc, it should return
461 461 * error upon receiving the CONS_GETTERM ioctl.
462 462 *
463 463 * if it is wc, we know that the target supports the CONS_GETTERM
464 464 * ioctl, which very conviently has the exact same data
465 465 * format as this ioctl... so let's just pass it on.
466 466 */
467 467 return (cdev_ioctl(rconsdev, CONS_GETTERM, arg, flag, cred, rvalp));
468 468 }
469 469
470 470 /* ARGSUSED */
471 471 static int
472 472 cnioctl(dev_t dev, int cmd, intptr_t arg, int flag, struct cred *cred,
473 473 int *rvalp)
474 474 {
475 475 if (rconsvp == NULL)
476 476 return (0);
477 477
478 478 /*
479 479 * In wc, VT_SET_CONSUSER which comes from minor node 0
480 480 * has two sources -- either /dev/console or /dev/vt/0 .
481 481 * We need a way to differentiate them, so here we
482 482 * change VT_SET_CONSUSER to a private VT_RESET_CONSUSER
483 483 * ioctl.
484 484 */
485 485 if (cmd == VT_SET_CONSUSER)
486 486 cmd = VT_RESET_CONSUSER;
487 487
488 488 if ((cmd & _CNIOC_MASK) == _CNIOC)
489 489 return (cnprivateioc(dev, cmd, arg, flag, cred, rvalp));
490 490
491 491 if (rconsvp->v_stream != NULL)
492 492 return (strioctl(rconsvp, cmd, arg, flag, U_TO_K,
493 493 cred, rvalp));
494 494
495 495 return (cdev_ioctl(rconsdev, cmd, arg, flag, cred, rvalp));
496 496 }
497 497
498 498 /* ARGSUSED */
499 499 static int
500 500 cnpoll(dev_t dev, short events, int anyyet, short *reventsp,
501 501 struct pollhead **phpp)
502 502 {
503 503 if (rconsvp == NULL)
504 504 return (nochpoll(dev, events, anyyet, reventsp, phpp));
505 505
506 506 if (rconsvp->v_stream != NULL)
507 507 return (strpoll(rconsvp->v_stream, events, anyyet, reventsp,
508 508 phpp));
509 509 else
510 510 return (cdev_poll(rconsdev, events, anyyet, reventsp, phpp));
511 511 }
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