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 * Copyright 2017 Joyent, Inc. 26 */ 27 28 29 /* 30 * srn Provide apm-like interfaces to Xorg 31 */ 32 33 #include <sys/types.h> 34 #include <sys/errno.h> 35 #include <sys/modctl.h> 36 #include <sys/conf.h> /* driver flags and functions */ 37 #include <sys/open.h> /* OTYP_CHR definition */ 38 #include <sys/stat.h> /* S_IFCHR definition */ 39 #include <sys/pathname.h> /* name -> dev_info xlation */ 40 #include <sys/kmem.h> /* memory alloc stuff */ 41 #include <sys/debug.h> 42 #include <sys/pm.h> 43 #include <sys/ddi.h> 44 #include <sys/sunddi.h> 45 #include <sys/epm.h> 46 #include <sys/vfs.h> 47 #include <sys/mode.h> 48 #include <sys/mkdev.h> 49 #include <sys/promif.h> 50 #include <sys/consdev.h> 51 #include <sys/ddi_impldefs.h> 52 #include <sys/poll.h> 53 #include <sys/note.h> 54 #include <sys/taskq.h> 55 #include <sys/policy.h> 56 #include <sys/srn.h> 57 58 /* 59 * Minor number is instance<<8 + clone minor from range 1-255; 60 * But only one will be allocated 61 */ 62 #define SRN_MINOR_TO_CLONE(minor) ((minor) & (SRN_MAX_CLONE - 1)) 63 #define SU 0x002 64 #define SG 0x004 65 66 extern kmutex_t srn_clone_lock; /* protects srn_clones array */ 67 extern kcondvar_t srn_clones_cv[SRN_MAX_CLONE]; 68 extern uint_t srn_poll_cnt[SRN_MAX_CLONE]; 69 70 /* 71 * The soft state of the srn driver. Since there will only be 72 * one of these, just reference it through a static struct. 73 */ 74 static struct srnstate { 75 dev_info_t *srn_dip; /* ptr to our dev_info node */ 76 int srn_instance; /* for ddi_get_instance() */ 77 uchar_t srn_clones[SRN_MAX_CLONE]; /* unique opens */ 78 struct cred *srn_cred[SRN_MAX_CLONE]; /* cred for each open */ 79 int srn_type[SRN_MAX_CLONE]; /* type of handshake */ 80 int srn_delivered[SRN_MAX_CLONE]; 81 srn_event_info_t srn_pending[SRN_MAX_CLONE]; 82 int srn_fault[SRN_MAX_CLONE]; 83 } srn = { NULL, -1}; 84 typedef struct srnstate *srn_state_t; 85 86 kcondvar_t srn_clones_cv[SRN_MAX_CLONE]; 87 uint_t srn_poll_cnt[SRN_MAX_CLONE]; /* count of events for poll */ 88 int srn_apm_count; 89 int srn_autosx_count; 90 /* Number of seconds to wait for clients to ack a poll */ 91 int srn_timeout = 10; 92 93 struct pollhead srn_pollhead[SRN_MAX_CLONE]; 94 95 static int srn_open(dev_t *, int, int, cred_t *); 96 static int srn_close(dev_t, int, int, cred_t *); 97 static int srn_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 98 static int srn_chpoll(dev_t, short, int, short *, struct pollhead **); 99 100 static struct cb_ops srn_cb_ops = { 101 srn_open, /* open */ 102 srn_close, /* close */ 103 nodev, /* strategy */ 104 nodev, /* print */ 105 nodev, /* dump */ 106 nodev, /* read */ 107 nodev, /* write */ 108 srn_ioctl, /* ioctl */ 109 nodev, /* devmap */ 110 nodev, /* mmap */ 111 nodev, /* segmap */ 112 srn_chpoll, /* poll */ 113 ddi_prop_op, /* prop_op */ 114 NULL, /* streamtab */ 115 D_NEW | D_MP /* driver compatibility flag */ 116 }; 117 118 static int srn_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, 119 void **result); 120 static int srn_attach(dev_info_t *dip, ddi_attach_cmd_t cmd); 121 static int srn_detach(dev_info_t *dip, ddi_detach_cmd_t cmd); 122 static void srn_notify(int type, int event); 123 124 static struct dev_ops srn_ops = { 125 DEVO_REV, /* devo_rev */ 126 0, /* refcnt */ 127 srn_getinfo, /* info */ 128 nulldev, /* identify */ 129 nulldev, /* probe */ 130 srn_attach, /* attach */ 131 srn_detach, /* detach */ 132 nodev, /* reset */ 133 &srn_cb_ops, /* driver operations */ 134 NULL, /* bus operations */ 135 NULL, /* power */ 136 ddi_quiesce_not_needed, /* quiesce */ 137 }; 138 139 static struct modldrv modldrv = { 140 &mod_driverops, 141 "srn driver", 142 &srn_ops 143 }; 144 145 static struct modlinkage modlinkage = { 146 MODREV_1, &modldrv, 0 147 }; 148 149 /* Local functions */ 150 151 int 152 _init(void) 153 { 154 return (mod_install(&modlinkage)); 155 } 156 157 int 158 _fini(void) 159 { 160 return (mod_remove(&modlinkage)); 161 } 162 163 int 164 _info(struct modinfo *modinfop) 165 { 166 return (mod_info(&modlinkage, modinfop)); 167 } 168 169 static int 170 srn_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 171 { 172 int i; 173 extern void (*srn_signal)(int, int); 174 175 switch (cmd) { 176 177 case DDI_ATTACH: 178 if (srn.srn_instance != -1) /* Only allow one instance */ 179 return (DDI_FAILURE); 180 srn.srn_instance = ddi_get_instance(dip); 181 if (ddi_create_minor_node(dip, "srn", S_IFCHR, 182 (srn.srn_instance << 8) + 0, DDI_PSEUDO, 0) 183 != DDI_SUCCESS) { 184 return (DDI_FAILURE); 185 } 186 srn.srn_dip = dip; /* srn_init and getinfo depend on it */ 187 188 for (i = 0; i < SRN_MAX_CLONE; i++) 189 cv_init(&srn_clones_cv[i], NULL, CV_DEFAULT, NULL); 190 191 srn.srn_instance = ddi_get_instance(dip); 192 mutex_enter(&srn_clone_lock); 193 srn_signal = srn_notify; 194 mutex_exit(&srn_clone_lock); 195 ddi_report_dev(dip); 196 return (DDI_SUCCESS); 197 198 default: 199 return (DDI_FAILURE); 200 } 201 } 202 203 /* ARGSUSED */ 204 static int 205 srn_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 206 { 207 int i; 208 extern int srn_inuse; 209 extern void (*srn_signal)(int, int); 210 211 switch (cmd) { 212 case DDI_DETACH: 213 214 mutex_enter(&srn_clone_lock); 215 while (srn_inuse) { 216 mutex_exit(&srn_clone_lock); 217 delay(1); 218 mutex_enter(&srn_clone_lock); 219 } 220 srn_signal = NULL; 221 mutex_exit(&srn_clone_lock); 222 223 for (i = 0; i < SRN_MAX_CLONE; i++) 224 cv_destroy(&srn_clones_cv[i]); 225 226 ddi_remove_minor_node(dip, NULL); 227 srn.srn_instance = -1; 228 return (DDI_SUCCESS); 229 230 default: 231 return (DDI_FAILURE); 232 } 233 } 234 235 236 #ifdef DEBUG 237 char *srn_cmd_string; 238 int srn_cmd; 239 #endif 240 241 /* 242 * Returns true if permission granted by credentials 243 * XXX 244 */ 245 static int 246 srn_perms(int perm, cred_t *cr) 247 { 248 if ((perm & SU) && secpolicy_power_mgmt(cr) == 0) /* privileged? */ 249 return (1); 250 if ((perm & SG) && (crgetgid(cr) == 0)) /* group 0 is ok */ 251 return (1); 252 return (0); 253 } 254 255 static int 256 srn_chpoll(dev_t dev, short events, int anyyet, short *reventsp, 257 struct pollhead **phpp) 258 { 259 extern struct pollhead srn_pollhead[]; 260 int clone; 261 262 clone = SRN_MINOR_TO_CLONE(getminor(dev)); 263 if ((events & (POLLIN | POLLRDNORM)) && srn_poll_cnt[clone]) { 264 *reventsp |= (POLLIN | POLLRDNORM); 265 } else { 266 *reventsp = 0; 267 } 268 269 if ((*reventsp == 0 && !anyyet) || (events & POLLET)) { 270 *phpp = &srn_pollhead[clone]; 271 } 272 return (0); 273 } 274 275 /*ARGSUSED*/ 276 static int 277 srn_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 278 { 279 dev_t dev; 280 int instance; 281 282 switch (infocmd) { 283 case DDI_INFO_DEVT2DEVINFO: 284 if (srn.srn_instance == -1) 285 return (DDI_FAILURE); 286 *result = srn.srn_dip; 287 return (DDI_SUCCESS); 288 289 case DDI_INFO_DEVT2INSTANCE: 290 dev = (dev_t)arg; 291 instance = getminor(dev) >> 8; 292 *result = (void *)(uintptr_t)instance; 293 return (DDI_SUCCESS); 294 295 default: 296 return (DDI_FAILURE); 297 } 298 } 299 300 301 /*ARGSUSED1*/ 302 static int 303 srn_open(dev_t *devp, int flag, int otyp, cred_t *cr) 304 { 305 int clone; 306 307 if (otyp != OTYP_CHR) 308 return (EINVAL); 309 310 mutex_enter(&srn_clone_lock); 311 for (clone = 1; clone < SRN_MAX_CLONE - 1; clone++) 312 if (!srn.srn_clones[clone]) 313 break; 314 315 if (clone == SRN_MAX_CLONE) { 316 mutex_exit(&srn_clone_lock); 317 return (ENXIO); 318 } 319 srn.srn_cred[clone] = cr; 320 ASSERT(srn_apm_count >= 0); 321 srn_apm_count++; 322 srn.srn_type[clone] = SRN_TYPE_APM; 323 crhold(cr); 324 325 *devp = makedevice(getmajor(*devp), (srn.srn_instance << 8) + 326 clone); 327 srn.srn_clones[clone] = 1; 328 srn.srn_cred[clone] = cr; 329 crhold(cr); 330 mutex_exit(&srn_clone_lock); 331 PMD(PMD_SX, ("srn open OK\n")) 332 return (0); 333 } 334 335 /*ARGSUSED1*/ 336 static int 337 srn_close(dev_t dev, int flag, int otyp, cred_t *cr) 338 { 339 int clone; 340 341 if (otyp != OTYP_CHR) 342 return (EINVAL); 343 344 clone = SRN_MINOR_TO_CLONE(getminor(dev)); 345 PMD(PMD_SX, ("srn_close: minor %x, clone %x\n", getminor(dev), 346 clone)) 347 mutex_enter(&srn_clone_lock); 348 crfree(srn.srn_cred[clone]); 349 srn.srn_cred[clone] = 0; 350 srn_poll_cnt[clone] = 0; 351 srn.srn_fault[clone] = 0; 352 if (srn.srn_pending[clone].ae_type || srn.srn_delivered[clone]) { 353 srn.srn_pending[clone].ae_type = 0; 354 srn.srn_delivered[clone] = 0; 355 cv_signal(&srn_clones_cv[clone]); 356 } 357 switch (srn.srn_type[clone]) { 358 case SRN_TYPE_AUTOSX: 359 ASSERT(srn_autosx_count); 360 srn_autosx_count--; 361 break; 362 case SRN_TYPE_APM: 363 ASSERT(srn_apm_count); 364 srn_apm_count--; 365 break; 366 default: 367 ASSERT(0); 368 return (EINVAL); 369 } 370 srn.srn_clones[clone] = 0; 371 mutex_exit(&srn_clone_lock); 372 return (0); 373 } 374 375 /*ARGSUSED*/ 376 static int 377 srn_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *cr, int *rval_p) 378 { 379 int clone = SRN_MINOR_TO_CLONE(getminor(dev)); 380 381 PMD(PMD_SX, ("ioctl: %x: begin\n", cmd)) 382 383 switch (cmd) { 384 case SRN_IOC_NEXTEVENT: 385 case SRN_IOC_SUSPEND: 386 case SRN_IOC_RESUME: 387 case SRN_IOC_AUTOSX: 388 break; 389 default: 390 return (ENOTTY); 391 } 392 393 if (!srn_perms(SU | SG, srn.srn_cred[clone])) { 394 return (EPERM); 395 } 396 switch (cmd) { 397 case SRN_IOC_AUTOSX: 398 PMD(PMD_SX, ("SRN_IOC_AUTOSX entered\n")) 399 mutex_enter(&srn_clone_lock); 400 if (!srn.srn_clones[clone]) { 401 PMD(PMD_SX, (" ioctl !srn_clones--EINVAL\n")) 402 mutex_exit(&srn_clone_lock); 403 return (EINVAL); 404 } 405 if (srn.srn_pending[clone].ae_type) { 406 PMD(PMD_SX, ("AUTOSX while pending--EBUSY\n")) 407 mutex_exit(&srn_clone_lock); 408 return (EBUSY); 409 } 410 if (srn.srn_type[clone] == SRN_TYPE_AUTOSX) { 411 PMD(PMD_SX, ("AUTOSX already--EBUSY\n")) 412 mutex_exit(&srn_clone_lock); 413 return (EBUSY); 414 } 415 ASSERT(srn.srn_type[clone] == SRN_TYPE_APM); 416 srn.srn_type[clone] = SRN_TYPE_AUTOSX; 417 srn.srn_fault[clone] = 0; 418 srn_apm_count--; 419 ASSERT(srn_apm_count >= 0); 420 ASSERT(srn_autosx_count >= 0); 421 srn_autosx_count++; 422 mutex_exit(&srn_clone_lock); 423 PMD(PMD_SX, ("SRN_IOC_AUTOSX returns success\n")) 424 return (0); 425 426 case SRN_IOC_NEXTEVENT: 427 /* 428 * return the next suspend or resume event; there should 429 * be one, cause we only get called if we've signalled a 430 * poll data completion 431 * then wake up the kernel thread sleeping for the delivery 432 */ 433 PMD(PMD_SX, ("SRN_IOC_NEXTEVENT entered\n")) 434 if (srn.srn_fault[clone]) { 435 PMD(PMD_SX, ("SRN_IOC_NEXTEVENT clone %d fault " 436 "cleared\n", clone)) 437 srn.srn_fault[clone] = 0; 438 } 439 mutex_enter(&srn_clone_lock); 440 if (srn_poll_cnt[clone] == 0) { 441 mutex_exit(&srn_clone_lock); 442 PMD(PMD_SX, ("SRN_IOC_NEXTEVENT clone %d " 443 "EWOULDBLOCK\n", clone)) 444 return (EWOULDBLOCK); 445 } 446 ASSERT(srn.srn_pending[clone].ae_type); 447 if (ddi_copyout(&srn.srn_pending[clone], (void *)arg, 448 sizeof (srn_event_info_t), mode) != 0) { 449 mutex_exit(&srn_clone_lock); 450 PMD(PMD_SX, ("SRN_IOC_NEXTEVENT clone %d EFAULT\n", 451 clone)) 452 return (EFAULT); 453 } 454 if (srn.srn_type[clone] == SRN_TYPE_APM) 455 srn.srn_delivered[clone] = 456 srn.srn_pending[clone].ae_type; 457 PMD(PMD_SX, ("SRN_IOC_NEXTEVENT clone %d delivered %x\n", 458 clone, srn.srn_pending[clone].ae_type)) 459 srn_poll_cnt[clone] = 0; 460 mutex_exit(&srn_clone_lock); 461 return (0); 462 463 case SRN_IOC_SUSPEND: 464 /* ack suspend */ 465 PMD(PMD_SX, ("SRN_IOC_SUSPEND entered clone %d\n", clone)) 466 if (srn.srn_fault[clone]) { 467 PMD(PMD_SX, ("SRN_IOC_SUSPEND clone %d fault " 468 "cleared\n", clone)) 469 srn.srn_fault[clone] = 0; 470 } 471 mutex_enter(&srn_clone_lock); 472 if (srn.srn_delivered[clone] != SRN_SUSPEND_REQ) { 473 mutex_exit(&srn_clone_lock); 474 PMD(PMD_SX, ("SRN_IOC_SUSPEND EINVAL\n")) 475 return (EINVAL); 476 } 477 srn.srn_delivered[clone] = 0; 478 srn.srn_pending[clone].ae_type = 0; 479 /* notify the kernel suspend thread to continue */ 480 PMD(PMD_SX, ("SRN_IOC_SUSPEND clone %d ok\n", clone)) 481 cv_signal(&srn_clones_cv[clone]); 482 mutex_exit(&srn_clone_lock); 483 return (0); 484 485 case SRN_IOC_RESUME: 486 /* ack resume */ 487 PMD(PMD_SX, ("SRN_IOC_RESUME entered clone %d\n", clone)) 488 if (srn.srn_fault[clone]) { 489 PMD(PMD_SX, ("SRN_IOC_RESUME clone %d fault " 490 "cleared\n", clone)) 491 srn.srn_fault[clone] = 0; 492 } 493 mutex_enter(&srn_clone_lock); 494 if (srn.srn_delivered[clone] != SRN_NORMAL_RESUME) { 495 mutex_exit(&srn_clone_lock); 496 PMD(PMD_SX, ("SRN_IOC_RESUME EINVAL\n")) 497 return (EINVAL); 498 } 499 srn.srn_delivered[clone] = 0; 500 srn.srn_pending[clone].ae_type = 0; 501 /* notify the kernel resume thread to continue */ 502 PMD(PMD_SX, ("SRN_IOC_RESUME ok for clone %d\n", clone)) 503 cv_signal(&srn_clones_cv[clone]); 504 mutex_exit(&srn_clone_lock); 505 return (0); 506 507 default: 508 PMD(PMD_SX, ("srn_ioctl unknown cmd EINVAL\n")) 509 return (EINVAL); 510 } 511 } 512 /* 513 * A very simple handshake with the srn driver, 514 * only one outstanding event at a time. 515 * The OS delivers the event and depending on type, 516 * either blocks waiting for the ack, or drives on 517 */ 518 void 519 srn_notify(int type, int event) 520 { 521 int clone, count; 522 PMD(PMD_SX, ("srn_notify entered with type %d, event 0x%x\n", 523 type, event)); 524 ASSERT(mutex_owned(&srn_clone_lock)); 525 switch (type) { 526 case SRN_TYPE_APM: 527 if (srn_apm_count == 0) { 528 PMD(PMD_SX, ("no apm types\n")) 529 return; 530 } 531 count = srn_apm_count; 532 break; 533 case SRN_TYPE_AUTOSX: 534 if (srn_autosx_count == 0) { 535 PMD(PMD_SX, ("no autosx types\n")) 536 return; 537 } 538 count = srn_autosx_count; 539 break; 540 default: 541 ASSERT(0); 542 break; 543 } 544 ASSERT(count > 0); 545 PMD(PMD_SX, ("count %d\n", count)) 546 for (clone = 0; clone < SRN_MAX_CLONE; clone++) { 547 if (srn.srn_type[clone] == type) { 548 #ifdef DEBUG 549 if (type == SRN_TYPE_APM && !srn.srn_fault[clone]) { 550 ASSERT(srn.srn_pending[clone].ae_type == 0); 551 ASSERT(srn_poll_cnt[clone] == 0); 552 ASSERT(srn.srn_delivered[clone] == 0); 553 } 554 #endif 555 srn.srn_pending[clone].ae_type = event; 556 srn_poll_cnt[clone] = 1; 557 PMD(PMD_SX, ("pollwake %d\n", clone)) 558 pollwakeup(&srn_pollhead[clone], (POLLRDNORM | POLLIN)); 559 count--; 560 if (count == 0) 561 break; 562 } 563 } 564 if (type == SRN_TYPE_AUTOSX) { /* we don't wait */ 565 PMD(PMD_SX, ("Not waiting for AUTOSX ack\n")) 566 return; 567 } 568 ASSERT(type == SRN_TYPE_APM); 569 /* otherwise wait for acks */ 570 restart: 571 /* 572 * We wait until all of the pending events are cleared. 573 * We have to start over every time we do a cv_wait because 574 * we give up the mutex and can be re-entered 575 */ 576 for (clone = 1; clone < SRN_MAX_CLONE; clone++) { 577 if (srn.srn_clones[clone] == 0 || 578 srn.srn_type[clone] != SRN_TYPE_APM) 579 continue; 580 if (srn.srn_pending[clone].ae_type && !srn.srn_fault[clone]) { 581 PMD(PMD_SX, ("srn_notify waiting for ack for clone %d, " 582 "event %x\n", clone, event)) 583 if (cv_timedwait(&srn_clones_cv[clone], 584 &srn_clone_lock, ddi_get_lbolt() + 585 drv_usectohz(srn_timeout * 1000000)) == -1) { 586 /* 587 * Client didn't respond, mark it as faulted 588 * and continue as if a regular signal. 589 */ 590 PMD(PMD_SX, ("srn_notify: clone %d did not " 591 "ack event %x\n", clone, event)) 592 cmn_err(CE_WARN, "srn_notify: clone %d did " 593 "not ack event %x\n", clone, event); 594 srn.srn_fault[clone] = 1; 595 } 596 goto restart; 597 } 598 } 599 PMD(PMD_SX, ("srn_notify done with %x\n", event)) 600 } 601