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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * sun4v domain services PRI driver 30 */ 31 32 #include <sys/types.h> 33 #include <sys/file.h> 34 #include <sys/errno.h> 35 #include <sys/open.h> 36 #include <sys/cred.h> 37 #include <sys/uio.h> 38 #include <sys/stat.h> 39 #include <sys/ksynch.h> 40 #include <sys/modctl.h> 41 #include <sys/conf.h> 42 #include <sys/devops.h> 43 #include <sys/debug.h> 44 #include <sys/cmn_err.h> 45 #include <sys/ddi.h> 46 #include <sys/sunddi.h> 47 #include <sys/ds.h> 48 49 #include <sys/ds_pri.h> 50 51 static uint_t ds_pri_debug = 0; 52 #define DS_PRI_DBG if (ds_pri_debug) printf 53 54 #define DS_PRI_NAME "ds_pri" 55 56 #define TEST_HARNESS 57 #ifdef TEST_HARNESS 58 #define DS_PRI_MAX_PRI_SIZE (64 * 1024) 59 60 #define DSIOC_TEST_REG 97 61 #define DSIOC_TEST_UNREG 98 62 #define DSIOC_TEST_DATA 99 63 64 struct ds_pri_test_data { 65 size_t size; 66 void *data; 67 }; 68 69 struct ds_pri_test_data32 { 70 size32_t size; 71 caddr32_t data; 72 }; 73 #endif /* TEST_HARNESS */ 74 75 typedef enum { 76 DS_PRI_REQUEST = 0, 77 DS_PRI_DATA = 1, 78 DS_PRI_UPDATE = 2 79 } ds_pri_msg_type_t; 80 81 typedef struct { 82 struct { 83 uint64_t seq_num; 84 uint64_t type; 85 } hdr; 86 uint8_t data[1]; 87 } ds_pri_msg_t; 88 89 /* The following are bit field flags */ 90 /* No service implies no PRI and no outstanding request */ 91 typedef enum { 92 DS_PRI_NO_SERVICE = 0x0, 93 DS_PRI_HAS_SERVICE = 0x1, 94 DS_PRI_REQUESTED = 0x2, 95 DS_PRI_HAS_PRI = 0x4 96 } ds_pri_flags_t; 97 98 struct ds_pri_state { 99 dev_info_t *dip; 100 int instance; 101 102 kmutex_t lock; 103 kcondvar_t cv; 104 105 /* PRI/DS */ 106 ds_pri_flags_t state; 107 uint64_t gencount; 108 ds_svc_hdl_t ds_pri_handle; 109 void *ds_pri; 110 size_t ds_pri_len; 111 uint64_t req_id; 112 uint64_t last_req_id; 113 int num_opens; 114 }; 115 116 typedef struct ds_pri_state ds_pri_state_t; 117 118 static void *ds_pri_statep; 119 120 static void request_pri(ds_pri_state_t *sp); 121 122 static int ds_pri_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 123 static int ds_pri_attach(dev_info_t *, ddi_attach_cmd_t); 124 static int ds_pri_detach(dev_info_t *, ddi_detach_cmd_t); 125 static int ds_pri_open(dev_t *, int, int, cred_t *); 126 static int ds_pri_close(dev_t, int, int, cred_t *); 127 static int ds_pri_read(dev_t, struct uio *, cred_t *); 128 static int ds_pri_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 129 130 /* 131 * DS Callbacks 132 */ 133 static void ds_pri_reg_handler(ds_cb_arg_t, ds_ver_t *, ds_svc_hdl_t); 134 static void ds_pri_unreg_handler(ds_cb_arg_t arg); 135 static void ds_pri_data_handler(ds_cb_arg_t arg, void *buf, size_t buflen); 136 137 /* 138 * PRI DS capability registration 139 */ 140 141 static ds_ver_t ds_pri_ver_1_0 = { 1, 0 }; 142 143 static ds_capability_t ds_pri_cap = { 144 "pri", 145 &ds_pri_ver_1_0, 146 1 147 }; 148 149 /* 150 * PRI DS Client callback vector 151 */ 152 static ds_clnt_ops_t ds_pri_ops = { 153 ds_pri_reg_handler, /* ds_reg_cb */ 154 ds_pri_unreg_handler, /* ds_unreg_cb */ 155 ds_pri_data_handler, /* ds_data_cb */ 156 NULL /* cb_arg */ 157 }; 158 159 /* 160 * DS PRI driver Ops Vector 161 */ 162 static struct cb_ops ds_pri_cb_ops = { 163 ds_pri_open, /* cb_open */ 164 ds_pri_close, /* cb_close */ 165 nodev, /* cb_strategy */ 166 nodev, /* cb_print */ 167 nodev, /* cb_dump */ 168 ds_pri_read, /* cb_read */ 169 nodev, /* cb_write */ 170 ds_pri_ioctl, /* cb_ioctl */ 171 nodev, /* cb_devmap */ 172 nodev, /* cb_mmap */ 173 nodev, /* cb_segmap */ 174 nochpoll, /* cb_chpoll */ 175 ddi_prop_op, /* cb_prop_op */ 176 (struct streamtab *)NULL, /* cb_str */ 177 D_MP | D_64BIT, /* cb_flag */ 178 CB_REV, /* cb_rev */ 179 nodev, /* cb_aread */ 180 nodev /* cb_awrite */ 181 }; 182 183 static struct dev_ops ds_pri_dev_ops = { 184 DEVO_REV, /* devo_rev */ 185 0, /* devo_refcnt */ 186 ds_pri_getinfo, /* devo_getinfo */ 187 nulldev, /* devo_identify */ 188 nulldev, /* devo_probe */ 189 ds_pri_attach, /* devo_attach */ 190 ds_pri_detach, /* devo_detach */ 191 nodev, /* devo_reset */ 192 &ds_pri_cb_ops, /* devo_cb_ops */ 193 (struct bus_ops *)NULL, /* devo_bus_ops */ 194 nulldev /* devo_power */ 195 }; 196 197 static struct modldrv modldrv = { 198 &mod_driverops, 199 "Domain Services PRI Driver 1.0", 200 &ds_pri_dev_ops 201 }; 202 203 static struct modlinkage modlinkage = { 204 MODREV_1, 205 (void *)&modldrv, 206 NULL 207 }; 208 209 210 int 211 _init(void) 212 { 213 int retval; 214 215 retval = ddi_soft_state_init(&ds_pri_statep, 216 sizeof (ds_pri_state_t), 0); 217 if (retval != 0) 218 return (retval); 219 220 retval = mod_install(&modlinkage); 221 if (retval != 0) { 222 ddi_soft_state_fini(&ds_pri_statep); 223 return (retval); 224 } 225 226 return (retval); 227 } 228 229 230 int 231 _info(struct modinfo *modinfop) 232 { 233 return (mod_info(&modlinkage, modinfop)); 234 } 235 236 237 int 238 _fini(void) 239 { 240 int retval; 241 242 if ((retval = mod_remove(&modlinkage)) != 0) 243 return (retval); 244 245 ddi_soft_state_fini(&ds_pri_statep); 246 247 return (retval); 248 } 249 250 251 /*ARGSUSED*/ 252 static int 253 ds_pri_getinfo(dev_info_t *dip, ddi_info_cmd_t cmd, void *arg, void **resultp) 254 { 255 ds_pri_state_t *sp; 256 int retval = DDI_FAILURE; 257 258 ASSERT(resultp != NULL); 259 260 switch (cmd) { 261 case DDI_INFO_DEVT2DEVINFO: 262 sp = ddi_get_soft_state(ds_pri_statep, getminor((dev_t)arg)); 263 if (sp != NULL) { 264 *resultp = sp->dip; 265 retval = DDI_SUCCESS; 266 } else 267 *resultp = NULL; 268 break; 269 270 case DDI_INFO_DEVT2INSTANCE: 271 *resultp = (void *)(uintptr_t)getminor((dev_t)arg); 272 retval = DDI_SUCCESS; 273 break; 274 275 default: 276 break; 277 } 278 279 return (retval); 280 } 281 282 283 static int 284 ds_pri_attach(dev_info_t *dip, ddi_attach_cmd_t cmd) 285 { 286 int instance; 287 ds_pri_state_t *sp; 288 int rv; 289 290 switch (cmd) { 291 case DDI_ATTACH: 292 break; 293 294 case DDI_RESUME: 295 return (DDI_SUCCESS); 296 297 default: 298 return (DDI_FAILURE); 299 } 300 301 instance = ddi_get_instance(dip); 302 303 if (ddi_soft_state_zalloc(ds_pri_statep, instance) != 304 DDI_SUCCESS) { 305 cmn_err(CE_WARN, "%s@%d: Unable to allocate state", 306 DS_PRI_NAME, instance); 307 return (DDI_FAILURE); 308 } 309 sp = ddi_get_soft_state(ds_pri_statep, instance); 310 311 mutex_init(&sp->lock, NULL, MUTEX_DEFAULT, NULL); 312 cv_init(&sp->cv, NULL, CV_DEFAULT, NULL); 313 314 if (ddi_create_minor_node(dip, DS_PRI_NAME, S_IFCHR, instance, 315 DDI_PSEUDO, 0) != DDI_SUCCESS) { 316 cmn_err(CE_WARN, "%s@%d: Unable to create minor node", 317 DS_PRI_NAME, instance); 318 goto fail; 319 } 320 321 if (ds_pri_ops.cb_arg != NULL) 322 goto fail; 323 ds_pri_ops.cb_arg = dip; 324 325 sp->state = DS_PRI_NO_SERVICE; 326 327 /* Until the service registers the handle is invalid */ 328 sp->ds_pri_handle = DS_INVALID_HDL; 329 330 sp->ds_pri = NULL; 331 sp->ds_pri_len = 0; 332 sp->req_id = 0; 333 sp->num_opens = 0; 334 335 if ((rv = ds_cap_init(&ds_pri_cap, &ds_pri_ops)) != 0) { 336 cmn_err(CE_NOTE, "ds_cap_init failed: %d", rv); 337 goto fail; 338 } 339 340 ddi_report_dev(dip); 341 342 return (DDI_SUCCESS); 343 344 fail: 345 ddi_remove_minor_node(dip, NULL); 346 cv_destroy(&sp->cv); 347 mutex_destroy(&sp->lock); 348 ddi_soft_state_free(ds_pri_statep, instance); 349 return (DDI_FAILURE); 350 351 } 352 353 354 /*ARGSUSED*/ 355 static int 356 ds_pri_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 357 { 358 ds_pri_state_t *sp; 359 int instance; 360 int rv; 361 362 instance = ddi_get_instance(dip); 363 sp = ddi_get_soft_state(ds_pri_statep, instance); 364 365 switch (cmd) { 366 case DDI_DETACH: 367 break; 368 369 case DDI_SUSPEND: 370 return (DDI_SUCCESS); 371 372 default: 373 return (DDI_FAILURE); 374 } 375 376 /* This really shouldn't fail - but check anyway */ 377 if ((rv = ds_cap_fini(&ds_pri_cap)) != 0) { 378 cmn_err(CE_WARN, "ds_cap_fini failed: %d", rv); 379 } 380 381 if (sp != NULL && sp->ds_pri_len != 0) 382 kmem_free(sp->ds_pri, sp->ds_pri_len); 383 384 ddi_remove_minor_node(dip, NULL); 385 cv_destroy(&sp->cv); 386 mutex_destroy(&sp->lock); 387 ddi_soft_state_free(ds_pri_statep, instance); 388 389 return (DDI_SUCCESS); 390 } 391 392 393 /*ARGSUSED*/ 394 static int 395 ds_pri_open(dev_t *devp, int flag, int otyp, cred_t *credp) 396 { 397 ds_pri_state_t *sp; 398 int instance; 399 400 if (otyp != OTYP_CHR) 401 return (EINVAL); 402 403 instance = getminor(*devp); 404 sp = ddi_get_soft_state(ds_pri_statep, instance); 405 if (sp == NULL) 406 return (ENXIO); 407 408 mutex_enter(&sp->lock); 409 410 /* 411 * If we're here and the state is DS_PRI_NO_SERVICE then this 412 * means that ds hasn't yet called the registration callback. 413 * Wait here and the callback will signal us when it has completed 414 * its work. 415 */ 416 if (sp->state == DS_PRI_NO_SERVICE) { 417 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 418 mutex_exit(&sp->lock); 419 return (EINTR); 420 } 421 } 422 423 sp->num_opens++; 424 425 mutex_exit(&sp->lock); 426 427 /* 428 * On open we dont fetch the PRI even if we have a valid service 429 * handle. PRI fetch is essentially lazy and on-demand. 430 */ 431 432 DS_PRI_DBG("ds_pri_open: state = 0x%x\n", sp->state); 433 434 return (0); 435 } 436 437 438 /*ARGSUSED*/ 439 static int 440 ds_pri_close(dev_t dev, int flag, int otyp, cred_t *credp) 441 { 442 int instance; 443 ds_pri_state_t *sp; 444 445 if (otyp != OTYP_CHR) 446 return (EINVAL); 447 448 DS_PRI_DBG("ds_pri_close\n"); 449 450 instance = getminor(dev); 451 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 452 return (ENXIO); 453 454 mutex_enter(&sp->lock); 455 if (!(sp->state & DS_PRI_HAS_SERVICE)) { 456 mutex_exit(&sp->lock); 457 return (0); 458 } 459 460 if (--sp->num_opens > 0) { 461 mutex_exit(&sp->lock); 462 return (0); 463 } 464 465 /* If we have an old PRI - remove it */ 466 if (sp->state & DS_PRI_HAS_PRI) { 467 if (sp->ds_pri != NULL && sp->ds_pri_len > 0) { 468 /* 469 * remove the old data if we have an 470 * outstanding request 471 */ 472 kmem_free(sp->ds_pri, sp->ds_pri_len); 473 sp->ds_pri_len = 0; 474 sp->ds_pri = NULL; 475 } 476 sp->state &= ~DS_PRI_HAS_PRI; 477 } 478 sp->state &= ~DS_PRI_REQUESTED; 479 mutex_exit(&sp->lock); 480 return (0); 481 } 482 483 484 /*ARGSUSED*/ 485 static int 486 ds_pri_read(dev_t dev, struct uio *uiop, cred_t *credp) 487 { 488 ds_pri_state_t *sp; 489 int instance; 490 size_t len; 491 int retval; 492 caddr_t tmpbufp; 493 494 instance = getminor(dev); 495 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 496 return (ENXIO); 497 498 len = uiop->uio_resid; 499 500 if (len == 0) 501 return (0); 502 503 mutex_enter(&sp->lock); 504 505 DS_PRI_DBG("ds_pri_read: state = 0x%x\n", sp->state); 506 507 /* block or bail if there is no current PRI */ 508 if (!(sp->state & DS_PRI_HAS_PRI)) { 509 DS_PRI_DBG("ds_pri_read: no PRI held\n"); 510 511 if (uiop->uio_fmode & (FNDELAY | FNONBLOCK)) { 512 mutex_exit(&sp->lock); 513 return (EAGAIN); 514 } 515 516 while (!(sp->state & DS_PRI_HAS_PRI)) { 517 DS_PRI_DBG("ds_pri_read: state = 0x%x\n", sp->state); 518 request_pri(sp); 519 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 520 mutex_exit(&sp->lock); 521 return (EINTR); 522 } 523 } 524 } 525 526 if (uiop->uio_offset < 0 || uiop->uio_offset > sp->ds_pri_len) { 527 mutex_exit(&sp->lock); 528 return (EINVAL); 529 } 530 531 if (len > (sp->ds_pri_len - uiop->uio_offset)) 532 len = sp->ds_pri_len - uiop->uio_offset; 533 534 /* already checked that offset < ds_pri_len above */ 535 if (len == 0) { 536 mutex_exit(&sp->lock); 537 return (0); 538 } 539 540 /* 541 * We're supposed to move the data out to userland, but 542 * that can suspend because of page faults etc., and meanwhile 543 * other parts of this driver want to update the PRI buffer ... 544 * we could hold the data buffer locked with a flag etc., 545 * but that's still a lock ... a simpler mechanism - if not quite 546 * as performance efficient is to simply clone here the part of 547 * the buffer we care about and then the original can be released 548 * for further updates while the uiomove continues. 549 */ 550 551 tmpbufp = kmem_alloc(len, KM_SLEEP); 552 bcopy(((caddr_t)sp->ds_pri) + uiop->uio_offset, tmpbufp, len); 553 mutex_exit(&sp->lock); 554 555 retval = uiomove(tmpbufp, len, UIO_READ, uiop); 556 557 kmem_free(tmpbufp, len); 558 559 return (retval); 560 } 561 562 563 /*ARGSUSED*/ 564 static int 565 ds_pri_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 566 int *rvalp) 567 { 568 ds_pri_state_t *sp; 569 int instance; 570 571 instance = getminor(dev); 572 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 573 return (ENXIO); 574 575 switch (cmd) { 576 case DSPRI_GETINFO: { 577 struct dspri_info info; 578 579 if (!(mode & FREAD)) 580 return (EACCES); 581 582 /* 583 * We are not guaranteed that ddi_copyout(9F) will read 584 * atomically anything larger than a byte. Therefore we 585 * must duplicate the size before copying it out to the user. 586 */ 587 mutex_enter(&sp->lock); 588 589 loop:; 590 if (sp->state & DS_PRI_HAS_PRI) { 591 /* If we have a PRI simply return the info */ 592 info.size = sp->ds_pri_len; 593 info.token = sp->gencount; 594 } else 595 if (!(sp->state & DS_PRI_HAS_SERVICE)) { 596 /* If we have no service return a nil response */ 597 info.size = 0; 598 info.token = 0; 599 } else { 600 request_pri(sp); 601 /* wait for something & check again */ 602 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 603 mutex_exit(&sp->lock); 604 return (EINTR); 605 } 606 goto loop; 607 } 608 DS_PRI_DBG("ds_pri_ioctl: DSPRI_GETINFO sz=0x%lx tok=0x%lx\n", 609 info.size, info.token); 610 mutex_exit(&sp->lock); 611 612 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode) != 0) 613 return (EFAULT); 614 break; 615 } 616 617 case DSPRI_WAIT: { 618 uint64_t gencount; 619 620 if (ddi_copyin((void *)arg, &gencount, sizeof (gencount), 621 mode) != 0) 622 return (EFAULT); 623 624 mutex_enter(&sp->lock); 625 626 DS_PRI_DBG("ds_pri_ioctl: DSPRI_WAIT gen=0x%lx sp->gen=0x%lx\n", 627 gencount, sp->gencount); 628 629 while ((sp->state & DS_PRI_HAS_PRI) == 0 || 630 gencount == sp->gencount) { 631 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 632 mutex_exit(&sp->lock); 633 return (EINTR); 634 } 635 } 636 mutex_exit(&sp->lock); 637 break; 638 } 639 640 default: 641 return (ENOTTY); 642 } 643 return (0); 644 } 645 646 647 /* assumes sp->lock is held when called */ 648 static void 649 request_pri(ds_pri_state_t *sp) 650 { 651 ds_pri_msg_t reqmsg; 652 653 ASSERT(MUTEX_HELD(&sp->lock)); 654 655 /* If a request is already pending we're done */ 656 if (!(sp->state & DS_PRI_HAS_SERVICE)) 657 return; 658 if (sp->state & DS_PRI_REQUESTED) 659 return; 660 661 /* If we have an old PRI - remove it */ 662 if (sp->state & DS_PRI_HAS_PRI) { 663 ASSERT(sp->ds_pri_len != 0); 664 ASSERT(sp->ds_pri != NULL); 665 666 /* remove the old data if we have an outstanding request */ 667 kmem_free(sp->ds_pri, sp->ds_pri_len); 668 sp->ds_pri_len = 0; 669 sp->ds_pri = NULL; 670 sp->state &= ~DS_PRI_HAS_PRI; 671 } else { 672 ASSERT(sp->ds_pri == NULL); 673 ASSERT(sp->ds_pri_len == 0); 674 } 675 676 reqmsg.hdr.seq_num = ++(sp->req_id); 677 reqmsg.hdr.type = DS_PRI_REQUEST; 678 679 DS_PRI_DBG("request_pri: request id 0x%lx\n", sp->req_id); 680 681 /* 682 * Request consists of header only. 683 * We don't care about fail status for ds_send; 684 * if it does fail we will get an unregister callback 685 * from the DS framework and we handle the state change 686 * there. 687 */ 688 (void) ds_cap_send(sp->ds_pri_handle, &reqmsg, sizeof (reqmsg.hdr)); 689 690 sp->state |= DS_PRI_REQUESTED; 691 sp->last_req_id = sp->req_id; 692 } 693 694 /* 695 * DS Callbacks 696 */ 697 /*ARGSUSED*/ 698 static void 699 ds_pri_reg_handler(ds_cb_arg_t arg, ds_ver_t *ver, ds_svc_hdl_t hdl) 700 { 701 dev_info_t *dip = arg; 702 ds_pri_state_t *sp; 703 int instance; 704 705 instance = ddi_get_instance(dip); 706 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 707 return; 708 709 DS_PRI_DBG("ds_pri_reg_handler: registering handle 0x%lx for version " 710 "0x%x:0x%x\n", (uint64_t)hdl, ver->major, ver->minor); 711 712 /* When the domain service comes up automatically req the pri */ 713 mutex_enter(&sp->lock); 714 715 ASSERT(sp->ds_pri_handle == DS_INVALID_HDL); 716 sp->ds_pri_handle = hdl; 717 718 ASSERT(sp->state == DS_PRI_NO_SERVICE); 719 ASSERT(sp->ds_pri == NULL); 720 ASSERT(sp->ds_pri_len == 0); 721 722 /* have service, but no PRI */ 723 sp->state |= DS_PRI_HAS_SERVICE; 724 725 /* 726 * Cannot request a PRI here, because the reg handler cannot 727 * do a DS send operation - we take care of this later. 728 */ 729 730 /* Wake up anyone waiting in open() */ 731 cv_broadcast(&sp->cv); 732 733 mutex_exit(&sp->lock); 734 } 735 736 737 static void 738 ds_pri_unreg_handler(ds_cb_arg_t arg) 739 { 740 dev_info_t *dip = arg; 741 ds_pri_state_t *sp; 742 int instance; 743 744 instance = ddi_get_instance(dip); 745 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 746 return; 747 748 DS_PRI_DBG("ds_pri_unreg_handler: un-registering ds_pri service\n"); 749 750 mutex_enter(&sp->lock); 751 752 /* Once the service goes - if we have a PRI at hand free it up */ 753 if (sp->ds_pri_len != 0) { 754 kmem_free(sp->ds_pri, sp->ds_pri_len); 755 sp->ds_pri_len = 0; 756 sp->ds_pri = NULL; 757 } 758 sp->ds_pri_handle = DS_INVALID_HDL; 759 sp->state = DS_PRI_NO_SERVICE; 760 761 mutex_exit(&sp->lock); 762 } 763 764 765 static void 766 ds_pri_data_handler(ds_cb_arg_t arg, void *buf, size_t buflen) 767 { 768 dev_info_t *dip = arg; 769 ds_pri_state_t *sp; 770 int instance; 771 void *data; 772 ds_pri_msg_t *msgp; 773 size_t pri_size; 774 775 msgp = (ds_pri_msg_t *)buf; 776 777 /* make sure the header is at least valid */ 778 if (buflen < sizeof (msgp->hdr)) 779 return; 780 781 DS_PRI_DBG("ds_pri_data_handler: msg buf len 0x%lx : type 0x%lx, " 782 "seqn 0x%lx\n", buflen, msgp->hdr.type, msgp->hdr.seq_num); 783 784 instance = ddi_get_instance(dip); 785 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 786 return; 787 788 mutex_enter(&sp->lock); 789 790 ASSERT(sp->state & DS_PRI_HAS_SERVICE); 791 792 switch (msgp->hdr.type) { 793 case DS_PRI_DATA: /* in response to a request from us */ 794 break; 795 case DS_PRI_UPDATE: /* aynch notification */ 796 /* our default response to this is to request the PRI */ 797 /* simply issue a request for the new PRI */ 798 request_pri(sp); 799 goto done; 800 default: /* ignore garbage or unknown message types */ 801 goto done; 802 } 803 804 /* 805 * If there is no pending PRI request, then we've received a 806 * bogus data message ... so ignore it. 807 */ 808 809 if (!(sp->state & DS_PRI_REQUESTED)) { 810 cmn_err(CE_WARN, "Received DS pri data without request"); 811 goto done; 812 } 813 814 /* response to a request therefore old PRI must be gone */ 815 ASSERT(!(sp->state & DS_PRI_HAS_PRI)); 816 ASSERT(sp->ds_pri_len == 0); 817 ASSERT(sp->ds_pri == NULL); 818 819 /* response seq_num should match our request seq_num */ 820 if (msgp->hdr.seq_num != sp->last_req_id) { 821 cmn_err(CE_WARN, "Received DS pri data out of sequence with " 822 "request"); 823 goto done; 824 } 825 826 pri_size = buflen - sizeof (msgp->hdr); 827 data = kmem_alloc(pri_size, KM_SLEEP); 828 sp->ds_pri = data; 829 sp->ds_pri_len = pri_size; 830 bcopy(msgp->data, data, sp->ds_pri_len); 831 sp->state &= ~DS_PRI_REQUESTED; 832 sp->state |= DS_PRI_HAS_PRI; 833 834 sp->gencount++; 835 cv_broadcast(&sp->cv); 836 837 done:; 838 mutex_exit(&sp->lock); 839 } 840