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 /* 28 * sun4v domain services PRI driver 29 */ 30 31 #include <sys/types.h> 32 #include <sys/file.h> 33 #include <sys/errno.h> 34 #include <sys/open.h> 35 #include <sys/cred.h> 36 #include <sys/uio.h> 37 #include <sys/stat.h> 38 #include <sys/ksynch.h> 39 #include <sys/modctl.h> 40 #include <sys/conf.h> 41 #include <sys/devops.h> 42 #include <sys/debug.h> 43 #include <sys/cmn_err.h> 44 #include <sys/ddi.h> 45 #include <sys/sunddi.h> 46 #include <sys/ds.h> 47 48 #include <sys/ds_pri.h> 49 50 static uint_t ds_pri_debug = 0; 51 #define DS_PRI_DBG if (ds_pri_debug) printf 52 53 #define DS_PRI_NAME "ds_pri" 54 55 #define TEST_HARNESS 56 #ifdef TEST_HARNESS 57 #define DS_PRI_MAX_PRI_SIZE (64 * 1024) 58 59 #define DSIOC_TEST_REG 97 60 #define DSIOC_TEST_UNREG 98 61 #define DSIOC_TEST_DATA 99 62 63 struct ds_pri_test_data { 64 size_t size; 65 void *data; 66 }; 67 68 struct ds_pri_test_data32 { 69 size32_t size; 70 caddr32_t data; 71 }; 72 #endif /* TEST_HARNESS */ 73 74 typedef enum { 75 DS_PRI_REQUEST = 0, 76 DS_PRI_DATA = 1, 77 DS_PRI_UPDATE = 2 78 } ds_pri_msg_type_t; 79 80 typedef struct { 81 struct { 82 uint64_t seq_num; 83 uint64_t type; 84 } hdr; 85 uint8_t data[1]; 86 } ds_pri_msg_t; 87 88 /* The following are bit field flags */ 89 /* No service implies no PRI and no outstanding request */ 90 typedef enum { 91 DS_PRI_NO_SERVICE = 0x0, 92 DS_PRI_HAS_SERVICE = 0x1, 93 DS_PRI_REQUESTED = 0x2, 94 DS_PRI_HAS_PRI = 0x4 95 } ds_pri_flags_t; 96 97 struct ds_pri_state { 98 dev_info_t *dip; 99 int instance; 100 101 kmutex_t lock; 102 kcondvar_t cv; 103 104 /* PRI/DS */ 105 ds_pri_flags_t state; 106 uint64_t gencount; 107 ds_svc_hdl_t ds_pri_handle; 108 void *ds_pri; 109 size_t ds_pri_len; 110 uint64_t req_id; 111 uint64_t last_req_id; 112 int num_opens; 113 }; 114 115 typedef struct ds_pri_state ds_pri_state_t; 116 117 static void *ds_pri_statep; 118 119 static void request_pri(ds_pri_state_t *sp); 120 121 static int ds_pri_getinfo(dev_info_t *, ddi_info_cmd_t, void *, void **); 122 static int ds_pri_attach(dev_info_t *, ddi_attach_cmd_t); 123 static int ds_pri_detach(dev_info_t *, ddi_detach_cmd_t); 124 static int ds_pri_open(dev_t *, int, int, cred_t *); 125 static int ds_pri_close(dev_t, int, int, cred_t *); 126 static int ds_pri_read(dev_t, struct uio *, cred_t *); 127 static int ds_pri_ioctl(dev_t, int, intptr_t, int, cred_t *, int *); 128 129 /* 130 * DS Callbacks 131 */ 132 static void ds_pri_reg_handler(ds_cb_arg_t, ds_ver_t *, ds_svc_hdl_t); 133 static void ds_pri_unreg_handler(ds_cb_arg_t arg); 134 static void ds_pri_data_handler(ds_cb_arg_t arg, void *buf, size_t buflen); 135 136 /* 137 * PRI DS capability registration 138 */ 139 140 static ds_ver_t ds_pri_ver_1_0 = { 1, 0 }; 141 142 static ds_capability_t ds_pri_cap = { 143 "pri", 144 &ds_pri_ver_1_0, 145 1 146 }; 147 148 /* 149 * PRI DS Client callback vector 150 */ 151 static ds_clnt_ops_t ds_pri_ops = { 152 ds_pri_reg_handler, /* ds_reg_cb */ 153 ds_pri_unreg_handler, /* ds_unreg_cb */ 154 ds_pri_data_handler, /* ds_data_cb */ 155 NULL /* cb_arg */ 156 }; 157 158 /* 159 * DS PRI driver Ops Vector 160 */ 161 static struct cb_ops ds_pri_cb_ops = { 162 ds_pri_open, /* cb_open */ 163 ds_pri_close, /* cb_close */ 164 nodev, /* cb_strategy */ 165 nodev, /* cb_print */ 166 nodev, /* cb_dump */ 167 ds_pri_read, /* cb_read */ 168 nodev, /* cb_write */ 169 ds_pri_ioctl, /* cb_ioctl */ 170 nodev, /* cb_devmap */ 171 nodev, /* cb_mmap */ 172 nodev, /* cb_segmap */ 173 nochpoll, /* cb_chpoll */ 174 ddi_prop_op, /* cb_prop_op */ 175 (struct streamtab *)NULL, /* cb_str */ 176 D_MP | D_64BIT, /* cb_flag */ 177 CB_REV, /* cb_rev */ 178 nodev, /* cb_aread */ 179 nodev /* cb_awrite */ 180 }; 181 182 static struct dev_ops ds_pri_dev_ops = { 183 DEVO_REV, /* devo_rev */ 184 0, /* devo_refcnt */ 185 ds_pri_getinfo, /* devo_getinfo */ 186 nulldev, /* devo_identify */ 187 nulldev, /* devo_probe */ 188 ds_pri_attach, /* devo_attach */ 189 ds_pri_detach, /* devo_detach */ 190 nodev, /* devo_reset */ 191 &ds_pri_cb_ops, /* devo_cb_ops */ 192 (struct bus_ops *)NULL, /* devo_bus_ops */ 193 nulldev, /* devo_power */ 194 ddi_quiesce_not_needed, /* devo_quiesce */ 195 }; 196 197 static struct modldrv modldrv = { 198 &mod_driverops, 199 "Domain Services PRI Driver", 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 ds_pri_ops.cb_arg = NULL; 385 386 ddi_remove_minor_node(dip, NULL); 387 cv_destroy(&sp->cv); 388 mutex_destroy(&sp->lock); 389 ddi_soft_state_free(ds_pri_statep, instance); 390 391 return (DDI_SUCCESS); 392 } 393 394 395 /*ARGSUSED*/ 396 static int 397 ds_pri_open(dev_t *devp, int flag, int otyp, cred_t *credp) 398 { 399 ds_pri_state_t *sp; 400 int instance; 401 402 if (otyp != OTYP_CHR) 403 return (EINVAL); 404 405 instance = getminor(*devp); 406 sp = ddi_get_soft_state(ds_pri_statep, instance); 407 if (sp == NULL) 408 return (ENXIO); 409 410 mutex_enter(&sp->lock); 411 412 /* 413 * If we're here and the state is DS_PRI_NO_SERVICE then this 414 * means that ds hasn't yet called the registration callback. 415 * A while loop is necessary as we might have been woken up 416 * prematurely, e.g., due to a debugger or "pstack" etc. 417 * Wait here and the callback will signal us when it has completed 418 * its work. 419 */ 420 while (sp->state == DS_PRI_NO_SERVICE) { 421 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 422 mutex_exit(&sp->lock); 423 return (EINTR); 424 } 425 } 426 427 sp->num_opens++; 428 mutex_exit(&sp->lock); 429 430 /* 431 * On open we dont fetch the PRI even if we have a valid service 432 * handle. PRI fetch is essentially lazy and on-demand. 433 */ 434 435 DS_PRI_DBG("ds_pri_open: state = 0x%x\n", sp->state); 436 437 return (0); 438 } 439 440 441 /*ARGSUSED*/ 442 static int 443 ds_pri_close(dev_t dev, int flag, int otyp, cred_t *credp) 444 { 445 int instance; 446 ds_pri_state_t *sp; 447 448 if (otyp != OTYP_CHR) 449 return (EINVAL); 450 451 DS_PRI_DBG("ds_pri_close\n"); 452 453 instance = getminor(dev); 454 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 455 return (ENXIO); 456 457 mutex_enter(&sp->lock); 458 if (!(sp->state & DS_PRI_HAS_SERVICE)) { 459 mutex_exit(&sp->lock); 460 return (0); 461 } 462 463 if (--sp->num_opens > 0) { 464 mutex_exit(&sp->lock); 465 return (0); 466 } 467 468 /* If we have an old PRI - remove it */ 469 if (sp->state & DS_PRI_HAS_PRI) { 470 if (sp->ds_pri != NULL && sp->ds_pri_len > 0) { 471 /* 472 * remove the old data if we have an 473 * outstanding request 474 */ 475 kmem_free(sp->ds_pri, sp->ds_pri_len); 476 sp->ds_pri_len = 0; 477 sp->ds_pri = NULL; 478 } 479 sp->state &= ~DS_PRI_HAS_PRI; 480 } 481 sp->state &= ~DS_PRI_REQUESTED; 482 mutex_exit(&sp->lock); 483 return (0); 484 } 485 486 487 /*ARGSUSED*/ 488 static int 489 ds_pri_read(dev_t dev, struct uio *uiop, cred_t *credp) 490 { 491 ds_pri_state_t *sp; 492 int instance; 493 size_t len; 494 int retval; 495 caddr_t tmpbufp; 496 offset_t off = uiop->uio_offset; 497 498 instance = getminor(dev); 499 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 500 return (ENXIO); 501 502 len = uiop->uio_resid; 503 504 if (len == 0) 505 return (0); 506 507 mutex_enter(&sp->lock); 508 509 DS_PRI_DBG("ds_pri_read: state = 0x%x\n", sp->state); 510 511 /* block or bail if there is no current PRI */ 512 if (!(sp->state & DS_PRI_HAS_PRI)) { 513 DS_PRI_DBG("ds_pri_read: no PRI held\n"); 514 515 if (uiop->uio_fmode & (FNDELAY | FNONBLOCK)) { 516 mutex_exit(&sp->lock); 517 return (EAGAIN); 518 } 519 520 while (!(sp->state & DS_PRI_HAS_PRI)) { 521 DS_PRI_DBG("ds_pri_read: state = 0x%x\n", sp->state); 522 request_pri(sp); 523 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 524 mutex_exit(&sp->lock); 525 return (EINTR); 526 } 527 } 528 } 529 530 if (len > sp->ds_pri_len) 531 len = sp->ds_pri_len; 532 533 if (len == 0) { 534 mutex_exit(&sp->lock); 535 return (0); 536 } 537 538 /* 539 * We're supposed to move the data out to userland, but 540 * that can suspend because of page faults etc., and meanwhile 541 * other parts of this driver want to update the PRI buffer ... 542 * we could hold the data buffer locked with a flag etc., 543 * but that's still a lock ... a simpler mechanism - if not quite 544 * as performance efficient is to simply clone here the part of 545 * the buffer we care about and then the original can be released 546 * for further updates while the uiomove continues. 547 */ 548 549 tmpbufp = kmem_alloc(len, KM_SLEEP); 550 bcopy(((caddr_t)sp->ds_pri), tmpbufp, len); 551 mutex_exit(&sp->lock); 552 553 retval = uiomove(tmpbufp, len, UIO_READ, uiop); 554 555 kmem_free(tmpbufp, len); 556 557 /* 558 * restore uio_offset after uiomove since the driver 559 * does not support the concept of position. 560 */ 561 uiop->uio_offset = off; 562 563 return (retval); 564 } 565 566 567 /*ARGSUSED*/ 568 static int 569 ds_pri_ioctl(dev_t dev, int cmd, intptr_t arg, int mode, cred_t *credp, 570 int *rvalp) 571 { 572 ds_pri_state_t *sp; 573 int instance; 574 575 instance = getminor(dev); 576 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 577 return (ENXIO); 578 579 switch (cmd) { 580 case DSPRI_GETINFO: { 581 struct dspri_info info; 582 583 if (!(mode & FREAD)) 584 return (EACCES); 585 586 /* 587 * We are not guaranteed that ddi_copyout(9F) will read 588 * atomically anything larger than a byte. Therefore we 589 * must duplicate the size before copying it out to the user. 590 */ 591 mutex_enter(&sp->lock); 592 593 loop:; 594 if (sp->state & DS_PRI_HAS_PRI) { 595 /* If we have a PRI simply return the info */ 596 info.size = sp->ds_pri_len; 597 info.token = sp->gencount; 598 } else 599 if (!(sp->state & DS_PRI_HAS_SERVICE)) { 600 /* If we have no service return a nil response */ 601 info.size = 0; 602 info.token = 0; 603 } else { 604 request_pri(sp); 605 /* wait for something & check again */ 606 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 607 mutex_exit(&sp->lock); 608 return (EINTR); 609 } 610 goto loop; 611 } 612 DS_PRI_DBG("ds_pri_ioctl: DSPRI_GETINFO sz=0x%lx tok=0x%lx\n", 613 info.size, info.token); 614 mutex_exit(&sp->lock); 615 616 if (ddi_copyout(&info, (void *)arg, sizeof (info), mode) != 0) 617 return (EFAULT); 618 break; 619 } 620 621 case DSPRI_WAIT: { 622 uint64_t gencount; 623 624 if (ddi_copyin((void *)arg, &gencount, sizeof (gencount), 625 mode) != 0) 626 return (EFAULT); 627 628 mutex_enter(&sp->lock); 629 630 DS_PRI_DBG("ds_pri_ioctl: DSPRI_WAIT gen=0x%lx sp->gen=0x%lx\n", 631 gencount, sp->gencount); 632 633 while ((sp->state & DS_PRI_HAS_PRI) == 0 || 634 gencount == sp->gencount) { 635 if ((sp->state & DS_PRI_HAS_PRI) == 0) 636 request_pri(sp); 637 if (cv_wait_sig(&sp->cv, &sp->lock) == 0) { 638 mutex_exit(&sp->lock); 639 return (EINTR); 640 } 641 } 642 mutex_exit(&sp->lock); 643 break; 644 } 645 646 default: 647 return (ENOTTY); 648 } 649 return (0); 650 } 651 652 653 /* assumes sp->lock is held when called */ 654 static void 655 request_pri(ds_pri_state_t *sp) 656 { 657 ds_pri_msg_t reqmsg; 658 659 ASSERT(MUTEX_HELD(&sp->lock)); 660 661 /* If a request is already pending we're done */ 662 if (!(sp->state & DS_PRI_HAS_SERVICE)) 663 return; 664 if (sp->state & DS_PRI_REQUESTED) 665 return; 666 667 /* If we have an old PRI - remove it */ 668 if (sp->state & DS_PRI_HAS_PRI) { 669 ASSERT(sp->ds_pri_len != 0); 670 ASSERT(sp->ds_pri != NULL); 671 672 /* remove the old data if we have an outstanding request */ 673 kmem_free(sp->ds_pri, sp->ds_pri_len); 674 sp->ds_pri_len = 0; 675 sp->ds_pri = NULL; 676 sp->state &= ~DS_PRI_HAS_PRI; 677 } else { 678 ASSERT(sp->ds_pri == NULL); 679 ASSERT(sp->ds_pri_len == 0); 680 } 681 682 reqmsg.hdr.seq_num = ++(sp->req_id); 683 reqmsg.hdr.type = DS_PRI_REQUEST; 684 685 DS_PRI_DBG("request_pri: request id 0x%lx\n", sp->req_id); 686 687 /* 688 * Request consists of header only. 689 * We don't care about fail status for ds_send; 690 * if it does fail we will get an unregister callback 691 * from the DS framework and we handle the state change 692 * there. 693 */ 694 (void) ds_cap_send(sp->ds_pri_handle, &reqmsg, sizeof (reqmsg.hdr)); 695 696 sp->state |= DS_PRI_REQUESTED; 697 sp->last_req_id = sp->req_id; 698 } 699 700 /* 701 * DS Callbacks 702 */ 703 /*ARGSUSED*/ 704 static void 705 ds_pri_reg_handler(ds_cb_arg_t arg, ds_ver_t *ver, ds_svc_hdl_t hdl) 706 { 707 dev_info_t *dip = arg; 708 ds_pri_state_t *sp; 709 int instance; 710 711 instance = ddi_get_instance(dip); 712 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 713 return; 714 715 DS_PRI_DBG("ds_pri_reg_handler: registering handle 0x%lx for version " 716 "0x%x:0x%x\n", (uint64_t)hdl, ver->major, ver->minor); 717 718 /* When the domain service comes up automatically req the pri */ 719 mutex_enter(&sp->lock); 720 721 ASSERT(sp->ds_pri_handle == DS_INVALID_HDL); 722 sp->ds_pri_handle = hdl; 723 724 ASSERT(sp->state == DS_PRI_NO_SERVICE); 725 ASSERT(sp->ds_pri == NULL); 726 ASSERT(sp->ds_pri_len == 0); 727 728 /* have service, but no PRI */ 729 sp->state |= DS_PRI_HAS_SERVICE; 730 731 /* 732 * Cannot request a PRI here, because the reg handler cannot 733 * do a DS send operation - we take care of this later. 734 */ 735 736 /* Wake up anyone waiting in open() */ 737 cv_broadcast(&sp->cv); 738 739 mutex_exit(&sp->lock); 740 } 741 742 743 static void 744 ds_pri_unreg_handler(ds_cb_arg_t arg) 745 { 746 dev_info_t *dip = arg; 747 ds_pri_state_t *sp; 748 int instance; 749 750 instance = ddi_get_instance(dip); 751 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 752 return; 753 754 DS_PRI_DBG("ds_pri_unreg_handler: un-registering ds_pri service\n"); 755 756 mutex_enter(&sp->lock); 757 758 /* Once the service goes - if we have a PRI at hand free it up */ 759 if (sp->ds_pri_len != 0) { 760 kmem_free(sp->ds_pri, sp->ds_pri_len); 761 sp->ds_pri_len = 0; 762 sp->ds_pri = NULL; 763 } 764 sp->ds_pri_handle = DS_INVALID_HDL; 765 sp->state = DS_PRI_NO_SERVICE; 766 767 mutex_exit(&sp->lock); 768 } 769 770 771 static void 772 ds_pri_data_handler(ds_cb_arg_t arg, void *buf, size_t buflen) 773 { 774 dev_info_t *dip = arg; 775 ds_pri_state_t *sp; 776 int instance; 777 void *data; 778 ds_pri_msg_t *msgp; 779 size_t pri_size; 780 781 msgp = (ds_pri_msg_t *)buf; 782 783 /* make sure the header is at least valid */ 784 if (buflen < sizeof (msgp->hdr)) 785 return; 786 787 DS_PRI_DBG("ds_pri_data_handler: msg buf len 0x%lx : type 0x%lx, " 788 "seqn 0x%lx\n", buflen, msgp->hdr.type, msgp->hdr.seq_num); 789 790 instance = ddi_get_instance(dip); 791 if ((sp = ddi_get_soft_state(ds_pri_statep, instance)) == NULL) 792 return; 793 794 mutex_enter(&sp->lock); 795 796 ASSERT(sp->state & DS_PRI_HAS_SERVICE); 797 798 switch (msgp->hdr.type) { 799 case DS_PRI_DATA: /* in response to a request from us */ 800 break; 801 case DS_PRI_UPDATE: /* aynch notification */ 802 /* our default response to this is to request the PRI */ 803 /* simply issue a request for the new PRI */ 804 request_pri(sp); 805 goto done; 806 default: /* ignore garbage or unknown message types */ 807 goto done; 808 } 809 810 /* 811 * If there is no pending PRI request, then we've received a 812 * bogus data message ... so ignore it. 813 */ 814 815 if (!(sp->state & DS_PRI_REQUESTED)) { 816 cmn_err(CE_WARN, "Received DS pri data without request"); 817 goto done; 818 } 819 820 /* response to a request therefore old PRI must be gone */ 821 ASSERT(!(sp->state & DS_PRI_HAS_PRI)); 822 ASSERT(sp->ds_pri_len == 0); 823 ASSERT(sp->ds_pri == NULL); 824 825 /* response seq_num should match our request seq_num */ 826 if (msgp->hdr.seq_num != sp->last_req_id) { 827 cmn_err(CE_WARN, "Received DS pri data out of sequence with " 828 "request"); 829 goto done; 830 } 831 832 pri_size = buflen - sizeof (msgp->hdr); 833 data = kmem_alloc(pri_size, KM_SLEEP); 834 sp->ds_pri = data; 835 sp->ds_pri_len = pri_size; 836 bcopy(msgp->data, data, sp->ds_pri_len); 837 sp->state &= ~DS_PRI_REQUESTED; 838 sp->state |= DS_PRI_HAS_PRI; 839 840 sp->gencount++; 841 cv_broadcast(&sp->cv); 842 843 done:; 844 mutex_exit(&sp->lock); 845 } 846