1 /* $NetBSD: acpi_pci_link.c,v 1.11 2007/12/16 23:11:08 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: acpi_pci_link.c,v 1.11 2007/12/16 23:11:08 jmcneill Exp $"); 31 32 #include "opt_acpi.h" 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/queue.h> 37 #include <sys/reboot.h> 38 39 #include <dev/acpi/acpica.h> 40 #include <dev/acpi/acpireg.h> 41 #include <dev/acpi/acpivar.h> 42 43 #include <dev/pci/pcireg.h> 44 #include <dev/pci/pcivar.h> 45 46 #define NUM_ISA_INTERRUPTS 16 47 #define NUM_ACPI_INTERRUPTS 256 48 49 #define PCI_INVALID_IRQ 255 50 #define PCI_INTERRUPT_VALID(x) ((x) != PCI_INVALID_IRQ && (x) != 0) 51 52 #define ACPI_SERIAL_BEGIN(x) 53 #define ACPI_SERIAL_END(x) 54 55 /* 56 * An ACPI PCI link device may contain multiple links. Each link has its 57 * own ACPI resource. _PRT entries specify which link is being used via 58 * the Source Index. 59 * 60 * XXX: A note about Source Indices and DPFs: Currently we assume that 61 * the DPF start and end tags are not counted towards the index that 62 * Source Index corresponds to. Also, we assume that when DPFs are in use 63 * they various sets overlap in terms of Indices. Here's an example 64 * resource list indicating these assumptions: 65 * 66 * Resource Index 67 * -------- ----- 68 * I/O Port 0 69 * Start DPF - 70 * IRQ 1 71 * MemIO 2 72 * Start DPF - 73 * IRQ 1 74 * MemIO 2 75 * End DPF - 76 * DMA Channel 3 77 * 78 * The XXX is because I'm not sure if this is a valid assumption to make. 79 */ 80 81 /* States during DPF processing. */ 82 #define DPF_OUTSIDE 0 83 #define DPF_FIRST 1 84 #define DPF_IGNORE 2 85 86 struct link; 87 88 struct acpi_pci_link_softc { 89 int pl_num_links; 90 int pl_crs_bad; 91 struct link *pl_links; 92 char pl_name[32]; 93 ACPI_HANDLE pl_handle; 94 void *pl_powerhook; 95 TAILQ_ENTRY(acpi_pci_link_softc) pl_list; 96 }; 97 98 static TAILQ_HEAD(, acpi_pci_link_softc) acpi_pci_linkdevs = 99 TAILQ_HEAD_INITIALIZER(acpi_pci_linkdevs); 100 101 102 struct link { 103 struct acpi_pci_link_softc *l_sc; 104 uint8_t l_bios_irq; 105 uint8_t l_irq; 106 uint8_t l_trig; 107 uint8_t l_pol; 108 uint8_t l_initial_irq; 109 int l_res_index; 110 int l_num_irqs; 111 int *l_irqs; 112 int l_references; 113 int l_dev_count; 114 pcitag_t *l_devices; 115 int l_routed:1; 116 int l_isa_irq:1; 117 ACPI_RESOURCE l_prs_template; 118 }; 119 120 struct link_count_request { 121 int in_dpf; 122 int count; 123 }; 124 125 struct link_res_request { 126 struct acpi_pci_link_softc *sc; 127 int in_dpf; 128 int res_index; 129 int link_index; 130 }; 131 132 MALLOC_DEFINE(M_PCI_LINK, "pci_link", "ACPI PCI Link structures"); 133 134 static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS]; 135 static int pci_link_bios_isa_irqs; 136 137 static ACPI_STATUS acpi_count_irq_resources(ACPI_RESOURCE *, void *); 138 static ACPI_STATUS link_add_crs(ACPI_RESOURCE *, void *); 139 static ACPI_STATUS link_add_prs(ACPI_RESOURCE *, void *); 140 static int link_valid_irq(struct link *, int); 141 static void acpi_pci_link_dump(struct acpi_pci_link_softc *); 142 static int acpi_pci_link_attach(struct acpi_pci_link_softc *); 143 static uint8_t acpi_pci_link_search_irq(struct acpi_pci_link_softc *, int, int, 144 int); 145 static void acpi_pci_link_resume(int, void *); 146 static struct link *acpi_pci_link_lookup(struct acpi_pci_link_softc *, int); 147 static ACPI_STATUS acpi_pci_link_srs(struct acpi_pci_link_softc *, 148 ACPI_BUFFER *); 149 static ACPI_STATUS acpi_AppendBufferResource(ACPI_BUFFER *, ACPI_RESOURCE *); 150 151 static ACPI_STATUS 152 acpi_count_irq_resources(ACPI_RESOURCE *res, void *context) 153 { 154 struct link_count_request *req; 155 156 req = (struct link_count_request *)context; 157 switch (res->Type) { 158 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 159 switch (req->in_dpf) { 160 case DPF_OUTSIDE: 161 /* We've started the first DPF. */ 162 req->in_dpf = DPF_FIRST; 163 break; 164 case DPF_FIRST: 165 /* We've started the second DPF. */ 166 req->in_dpf = DPF_IGNORE; 167 break; 168 } 169 break; 170 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 171 /* We are finished with DPF parsing. */ 172 KASSERT(req->in_dpf != DPF_OUTSIDE); 173 req->in_dpf = DPF_OUTSIDE; 174 break; 175 case ACPI_RESOURCE_TYPE_IRQ: 176 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 177 /* 178 * Don't count resources if we are in a DPF set that we are 179 * ignoring. 180 */ 181 if (req->in_dpf != DPF_IGNORE) 182 req->count++; 183 } 184 return (AE_OK); 185 } 186 187 static ACPI_STATUS 188 link_add_crs(ACPI_RESOURCE *res, void *context) 189 { 190 struct link_res_request *req; 191 struct link *link; 192 193 req = (struct link_res_request *)context; 194 switch (res->Type) { 195 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 196 switch (req->in_dpf) { 197 case DPF_OUTSIDE: 198 /* We've started the first DPF. */ 199 req->in_dpf = DPF_FIRST; 200 break; 201 case DPF_FIRST: 202 /* We've started the second DPF. */ 203 panic( 204 "%s: Multiple dependent functions within a current resource", 205 __func__); 206 break; 207 } 208 break; 209 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 210 /* We are finished with DPF parsing. */ 211 KASSERT(req->in_dpf != DPF_OUTSIDE); 212 req->in_dpf = DPF_OUTSIDE; 213 break; 214 case ACPI_RESOURCE_TYPE_IRQ: 215 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 216 KASSERT(req->link_index < req->sc->pl_num_links); 217 link = &req->sc->pl_links[req->link_index]; 218 link->l_res_index = req->res_index; 219 req->link_index++; 220 req->res_index++; 221 222 /* 223 * Only use the current value if there's one IRQ. Some 224 * systems return multiple IRQs (which is nonsense for _CRS) 225 * when the link hasn't been programmed. 226 */ 227 if (res->Type == ACPI_RESOURCE_TYPE_IRQ) { 228 if (res->Data.Irq.InterruptCount == 1) { 229 link->l_irq = res->Data.Irq.Interrupts[0]; 230 link->l_trig = res->Data.Irq.Triggering; 231 link->l_pol = res->Data.Irq.Polarity; 232 } 233 } else if (res->Data.ExtendedIrq.InterruptCount == 1) { 234 link->l_irq = res->Data.ExtendedIrq.Interrupts[0]; 235 link->l_trig = res->Data.ExtendedIrq.Triggering; 236 link->l_pol = res->Data.ExtendedIrq.Polarity; 237 } 238 239 /* 240 * An IRQ of zero means that the link isn't routed. 241 */ 242 if (link->l_irq == 0) 243 link->l_irq = PCI_INVALID_IRQ; 244 break; 245 default: 246 req->res_index++; 247 } 248 return (AE_OK); 249 } 250 251 /* 252 * Populate the set of possible IRQs for each device. 253 */ 254 static ACPI_STATUS 255 link_add_prs(ACPI_RESOURCE *res, void *context) 256 { 257 struct link_res_request *req; 258 struct link *link; 259 UINT8 *irqs = NULL; 260 UINT32 *ext_irqs = NULL; 261 int i, is_ext_irq = 1; 262 263 req = (struct link_res_request *)context; 264 switch (res->Type) { 265 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 266 switch (req->in_dpf) { 267 case DPF_OUTSIDE: 268 /* We've started the first DPF. */ 269 req->in_dpf = DPF_FIRST; 270 break; 271 case DPF_FIRST: 272 /* We've started the second DPF. */ 273 req->in_dpf = DPF_IGNORE; 274 break; 275 } 276 break; 277 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 278 /* We are finished with DPF parsing. */ 279 KASSERT(req->in_dpf != DPF_OUTSIDE); 280 req->in_dpf = DPF_OUTSIDE; 281 break; 282 case ACPI_RESOURCE_TYPE_IRQ: 283 is_ext_irq = 0; 284 /* fall through */ 285 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 286 /* 287 * Don't parse resources if we are in a DPF set that we are 288 * ignoring. 289 */ 290 if (req->in_dpf == DPF_IGNORE) 291 break; 292 293 KASSERT(req->link_index < req->sc->pl_num_links); 294 link = &req->sc->pl_links[req->link_index]; 295 if (link->l_res_index == -1) { 296 KASSERT(req->sc->pl_crs_bad); 297 link->l_res_index = req->res_index; 298 } 299 req->link_index++; 300 req->res_index++; 301 302 /* 303 * Stash a copy of the resource for later use when 304 * doing _SRS. 305 * 306 * Note that in theory res->Length may exceed the size 307 * of ACPI_RESOURCE, due to variable length lists in 308 * subtypes. However, all uses of l_prs_template only 309 * rely on lists lengths of zero or one, for which 310 * sizeof(ACPI_RESOURCE) is sufficient space anyway. 311 * We cannot read longer than Length bytes, in case we 312 * read off the end of mapped memory. So we read 313 * whichever length is shortest, Length or 314 * sizeof(ACPI_RESOURCE). 315 */ 316 KASSERT(res->Length >= ACPI_RS_SIZE_MIN); 317 318 memset(&link->l_prs_template, 0, sizeof(link->l_prs_template)); 319 memcpy(&link->l_prs_template, res, 320 MIN(res->Length, sizeof(link->l_prs_template))); 321 322 if (is_ext_irq) { 323 link->l_num_irqs = 324 res->Data.ExtendedIrq.InterruptCount; 325 link->l_trig = res->Data.ExtendedIrq.Triggering; 326 link->l_pol = res->Data.ExtendedIrq.Polarity; 327 ext_irqs = res->Data.ExtendedIrq.Interrupts; 328 } else { 329 link->l_num_irqs = res->Data.Irq.InterruptCount; 330 link->l_trig = res->Data.Irq.Triggering; 331 link->l_pol = res->Data.Irq.Polarity; 332 irqs = res->Data.Irq.Interrupts; 333 } 334 if (link->l_num_irqs == 0) 335 break; 336 337 /* 338 * Save a list of the valid IRQs. Also, if all of the 339 * valid IRQs are ISA IRQs, then mark this link as 340 * routed via an ISA interrupt. 341 */ 342 link->l_isa_irq = TRUE; 343 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, 344 M_PCI_LINK, M_WAITOK | M_ZERO); 345 for (i = 0; i < link->l_num_irqs; i++) { 346 if (is_ext_irq) { 347 link->l_irqs[i] = ext_irqs[i]; 348 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS) 349 link->l_isa_irq = FALSE; 350 } else { 351 link->l_irqs[i] = irqs[i]; 352 if (irqs[i] >= NUM_ISA_INTERRUPTS) 353 link->l_isa_irq = FALSE; 354 } 355 } 356 break; 357 default: 358 if (req->in_dpf == DPF_IGNORE) 359 break; 360 if (req->sc->pl_crs_bad) 361 aprint_normal("%s: Warning: possible resource %d " 362 "will be lost during _SRS\n", req->sc->pl_name, 363 req->res_index); 364 req->res_index++; 365 } 366 return (AE_OK); 367 } 368 369 static int 370 link_valid_irq(struct link *link, int irq) 371 { 372 int i; 373 374 /* Invalid interrupts are never valid. */ 375 if (!PCI_INTERRUPT_VALID(irq)) 376 return (FALSE); 377 378 /* Any interrupt in the list of possible interrupts is valid. */ 379 for (i = 0; i < link->l_num_irqs; i++) 380 if (link->l_irqs[i] == irq) 381 return (TRUE); 382 383 /* 384 * For links routed via an ISA interrupt, if the SCI is routed via 385 * an ISA interrupt, the SCI is always treated as a valid IRQ. 386 */ 387 if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq && 388 irq < NUM_ISA_INTERRUPTS) 389 return (TRUE); 390 391 /* If the interrupt wasn't found in the list it is not valid. */ 392 return (FALSE); 393 } 394 395 void 396 acpi_pci_link_state(void) 397 { 398 struct acpi_pci_link_softc *sc; 399 400 TAILQ_FOREACH(sc, &acpi_pci_linkdevs, pl_list) { 401 acpi_pci_link_dump(sc); 402 } 403 } 404 405 static void 406 acpi_pci_link_dump(struct acpi_pci_link_softc *sc) 407 { 408 struct link *link; 409 int i, j; 410 411 printf("Link Device %s:\n", sc->pl_name); 412 printf("Index IRQ Rtd Ref IRQs\n"); 413 for (i = 0; i < sc->pl_num_links; i++) { 414 link = &sc->pl_links[i]; 415 printf("%5d %3d %c %3d ", i, link->l_irq, 416 link->l_routed ? 'Y' : 'N', link->l_references); 417 if (link->l_num_irqs == 0) 418 printf(" none"); 419 else for (j = 0; j < link->l_num_irqs; j++) 420 printf(" %d", link->l_irqs[j]); 421 printf(" polarity %u trigger %u\n", link->l_pol, link->l_trig); 422 } 423 printf("\n"); 424 } 425 426 static int 427 acpi_pci_link_attach(struct acpi_pci_link_softc *sc) 428 { 429 struct link_count_request creq; 430 struct link_res_request rreq; 431 ACPI_STATUS status; 432 int i; 433 434 ACPI_SERIAL_BEGIN(pci_link); 435 436 /* 437 * Count the number of current resources so we know how big of 438 * a link array to allocate. On some systems, _CRS is broken, 439 * so for those systems try to derive the count from _PRS instead. 440 */ 441 creq.in_dpf = DPF_OUTSIDE; 442 creq.count = 0; 443 status = AcpiWalkResources(sc->pl_handle, "_CRS", 444 acpi_count_irq_resources, &creq); 445 sc->pl_crs_bad = ACPI_FAILURE(status); 446 if (sc->pl_crs_bad) { 447 creq.in_dpf = DPF_OUTSIDE; 448 creq.count = 0; 449 status = AcpiWalkResources(sc->pl_handle, "_PRS", 450 acpi_count_irq_resources, &creq); 451 if (ACPI_FAILURE(status)) { 452 aprint_error("%s: Unable to parse _CRS or _PRS: %s\n", 453 sc->pl_name, AcpiFormatException(status)); 454 ACPI_SERIAL_END(pci_link); 455 return (ENXIO); 456 } 457 } 458 sc->pl_num_links = creq.count; 459 if (creq.count == 0) { 460 ACPI_SERIAL_END(pci_link); 461 return (0); 462 } 463 sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links, 464 M_PCI_LINK, M_WAITOK | M_ZERO); 465 466 /* Initialize the child links. */ 467 for (i = 0; i < sc->pl_num_links; i++) { 468 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 469 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ; 470 sc->pl_links[i].l_sc = sc; 471 sc->pl_links[i].l_isa_irq = FALSE; 472 sc->pl_links[i].l_res_index = -1; 473 sc->pl_links[i].l_dev_count = 0; 474 sc->pl_links[i].l_devices = NULL; 475 } 476 477 /* Try to read the current settings from _CRS if it is valid. */ 478 if (!sc->pl_crs_bad) { 479 rreq.in_dpf = DPF_OUTSIDE; 480 rreq.link_index = 0; 481 rreq.res_index = 0; 482 rreq.sc = sc; 483 status = AcpiWalkResources(sc->pl_handle, "_CRS", 484 link_add_crs, &rreq); 485 if (ACPI_FAILURE(status)) { 486 aprint_error("%s: Unable to parse _CRS: %s\n", 487 sc->pl_name, AcpiFormatException(status)); 488 goto fail; 489 } 490 } 491 492 /* 493 * Try to read the possible settings from _PRS. Note that if the 494 * _CRS is toast, we depend on having a working _PRS. However, if 495 * _CRS works, then it is ok for _PRS to be missing. 496 */ 497 rreq.in_dpf = DPF_OUTSIDE; 498 rreq.link_index = 0; 499 rreq.res_index = 0; 500 rreq.sc = sc; 501 status = AcpiWalkResources(sc->pl_handle, "_PRS", 502 link_add_prs, &rreq); 503 if (ACPI_FAILURE(status) && 504 (status != AE_NOT_FOUND || sc->pl_crs_bad)) { 505 aprint_error("%s: Unable to parse _PRS: %s\n", 506 sc->pl_name, AcpiFormatException(status)); 507 goto fail; 508 } 509 if (boothowto & AB_VERBOSE) { 510 aprint_normal("%s: Links after initial probe:\n", sc->pl_name); 511 acpi_pci_link_dump(sc); 512 } 513 514 /* Verify initial IRQs if we have _PRS. */ 515 if (status != AE_NOT_FOUND) 516 for (i = 0; i < sc->pl_num_links; i++) 517 if (!link_valid_irq(&sc->pl_links[i], 518 sc->pl_links[i].l_irq)) 519 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 520 if (boothowto & AB_VERBOSE) { 521 printf("%s: Links after initial validation:\n", sc->pl_name); 522 acpi_pci_link_dump(sc); 523 } 524 525 /* Save initial IRQs. */ 526 for (i = 0; i < sc->pl_num_links; i++) 527 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; 528 529 /* 530 * Try to disable this link. If successful, set the current IRQ to 531 * zero and flags to indicate this link is not routed. If we can't 532 * run _DIS (i.e., the method doesn't exist), assume the initial 533 * IRQ was routed by the BIOS. 534 */ 535 #if 0 /* XXX causes spontaneaous resets on some systems. Disabled for now. */ 536 if (ACPI_SUCCESS(AcpiEvaluateObject(sc->pl_handle, "_DIS", NULL, 537 NULL))) 538 for (i = 0; i < sc->pl_num_links; i++) 539 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 540 else 541 #endif 542 for (i = 0; i < sc->pl_num_links; i++) 543 if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) 544 sc->pl_links[i].l_routed = TRUE; 545 if (boothowto & AB_VERBOSE) { 546 printf("%s: Links after disable:\n", sc->pl_name); 547 acpi_pci_link_dump(sc); 548 } 549 ACPI_SERIAL_END(pci_link); 550 return (0); 551 fail: 552 ACPI_SERIAL_END(pci_link); 553 for (i = 0; i < sc->pl_num_links; i++) { 554 if (sc->pl_links[i].l_irqs != NULL) 555 free(sc->pl_links[i].l_irqs, M_PCI_LINK); 556 if (sc->pl_links[i].l_devices != NULL) 557 free(sc->pl_links[i].l_devices, M_PCI_LINK); 558 } 559 free(sc->pl_links, M_PCI_LINK); 560 return (ENXIO); 561 } 562 563 static void 564 acpi_pci_link_add_functions(struct acpi_pci_link_softc *sc, struct link *link, 565 int bus, int device, int pin) 566 { 567 uint32_t value; 568 uint8_t func, maxfunc, ipin; 569 pcitag_t tag; 570 571 tag = pci_make_tag(acpi_softc->sc_pc, bus, device, 0); 572 /* See if we have a valid device at function 0. */ 573 value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_BHLC_REG); 574 if (PCI_HDRTYPE_TYPE(value) > PCI_HDRTYPE_PCB) 575 return; 576 if (PCI_HDRTYPE_MULTIFN(value)) 577 maxfunc = 7; 578 else 579 maxfunc = 0; 580 581 /* Scan all possible functions at this device. */ 582 for (func = 0; func <= maxfunc; func++) { 583 tag = pci_make_tag(acpi_softc->sc_pc, bus, device, func); 584 value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_ID_REG); 585 if (PCI_VENDOR(value) == 0xffff) 586 continue; 587 value = pci_conf_read(acpi_softc->sc_pc, tag, 588 PCI_INTERRUPT_REG); 589 ipin = PCI_INTERRUPT_PIN(value); 590 /* 591 * See if it uses the pin in question. Note that the passed 592 * in pin uses 0 for A, .. 3 for D whereas the intpin 593 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 594 */ 595 if (ipin != pin + 1) 596 continue; 597 598 link->l_devices = realloc(link->l_devices, 599 sizeof(pcitag_t) * (link->l_dev_count + 1), 600 M_PCI_LINK, M_WAITOK); 601 link->l_devices[link->l_dev_count] = tag; 602 ++link->l_dev_count; 603 } 604 } 605 606 static uint8_t 607 acpi_pci_link_search_irq(struct acpi_pci_link_softc *sc, int bus, int device, 608 int pin) 609 { 610 uint32_t value; 611 uint8_t func, maxfunc, ipin, iline; 612 pcitag_t tag; 613 614 tag = pci_make_tag(acpi_softc->sc_pc, bus, device, 0); 615 /* See if we have a valid device at function 0. */ 616 value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_BHLC_REG); 617 if (PCI_HDRTYPE_TYPE(value) > PCI_HDRTYPE_PCB) 618 return (PCI_INVALID_IRQ); 619 if (PCI_HDRTYPE_MULTIFN(value)) 620 maxfunc = 7; 621 else 622 maxfunc = 0; 623 624 /* Scan all possible functions at this device. */ 625 for (func = 0; func <= maxfunc; func++) { 626 tag = pci_make_tag(acpi_softc->sc_pc, bus, device, func); 627 value = pci_conf_read(acpi_softc->sc_pc, tag, PCI_ID_REG); 628 if (PCI_VENDOR(value) == 0xffff) 629 continue; 630 value = pci_conf_read(acpi_softc->sc_pc, tag, 631 PCI_INTERRUPT_REG); 632 ipin = PCI_INTERRUPT_PIN(value); 633 iline = PCI_INTERRUPT_LINE(value); 634 635 /* 636 * See if it uses the pin in question. Note that the passed 637 * in pin uses 0 for A, .. 3 for D whereas the intpin 638 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 639 */ 640 if (ipin != pin + 1) 641 continue; 642 aprint_verbose( 643 "%s: ACPI: Found matching pin for %d.%d.INT%c" 644 " at func %d: %d\n", 645 sc->pl_name, bus, device, pin + 'A', func, iline); 646 if (PCI_INTERRUPT_VALID(iline)) 647 return (iline); 648 } 649 return (PCI_INVALID_IRQ); 650 } 651 652 /* 653 * Find the link structure that corresponds to the resource index passed in 654 * via 'source_index'. 655 */ 656 static struct link * 657 acpi_pci_link_lookup(struct acpi_pci_link_softc *sc, int source_index) 658 { 659 int i; 660 661 for (i = 0; i < sc->pl_num_links; i++) 662 if (sc->pl_links[i].l_res_index == source_index) 663 return (&sc->pl_links[i]); 664 return (NULL); 665 } 666 667 void 668 acpi_pci_link_add_reference(void *v, int index, int bus, int slot, int pin) 669 { 670 struct acpi_pci_link_softc *sc = v; 671 struct link *link; 672 uint8_t bios_irq; 673 674 /* Bump the reference count. */ 675 ACPI_SERIAL_BEGIN(pci_link); 676 link = acpi_pci_link_lookup(sc, index); 677 if (link == NULL) { 678 printf("%s: apparently invalid index %d\n", sc->pl_name, index); 679 ACPI_SERIAL_END(pci_link); 680 return; 681 } 682 link->l_references++; 683 acpi_pci_link_add_functions(sc, link, bus, slot, pin); 684 if (link->l_routed) 685 pci_link_interrupt_weights[link->l_irq]++; 686 687 /* 688 * The BIOS only routes interrupts via ISA IRQs using the ATPICs 689 * (8259As). Thus, if this link is routed via an ISA IRQ, go 690 * look to see if the BIOS routed an IRQ for this link at the 691 * indicated (bus, slot, pin). If so, we prefer that IRQ for 692 * this link and add that IRQ to our list of known-good IRQs. 693 * This provides a good work-around for link devices whose _CRS 694 * method is either broken or bogus. We only use the value 695 * returned by _CRS if we can't find a valid IRQ via this method 696 * in fact. 697 * 698 * If this link is not routed via an ISA IRQ (because we are using 699 * APIC for example), then don't bother looking up the BIOS IRQ 700 * as if we find one it won't be valid anyway. 701 */ 702 if (!link->l_isa_irq) { 703 ACPI_SERIAL_END(pci_link); 704 return; 705 } 706 707 /* Try to find a BIOS IRQ setting from any matching devices. */ 708 bios_irq = acpi_pci_link_search_irq(sc, bus, slot, pin); 709 if (!PCI_INTERRUPT_VALID(bios_irq)) { 710 ACPI_SERIAL_END(pci_link); 711 return; 712 } 713 714 /* Validate the BIOS IRQ. */ 715 if (!link_valid_irq(link, bios_irq)) { 716 printf("%s: BIOS IRQ %u for %d.%d.INT%c is invalid\n", 717 sc->pl_name, bios_irq, (int)bus, slot, pin + 'A'); 718 } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { 719 link->l_bios_irq = bios_irq; 720 if (bios_irq < NUM_ISA_INTERRUPTS) 721 pci_link_bios_isa_irqs |= (1 << bios_irq); 722 if (bios_irq != link->l_initial_irq && 723 PCI_INTERRUPT_VALID(link->l_initial_irq)) 724 printf( 725 "%s: BIOS IRQ %u does not match initial IRQ %u\n", 726 sc->pl_name, bios_irq, link->l_initial_irq); 727 } else if (bios_irq != link->l_bios_irq) 728 printf( 729 "%s: BIOS IRQ %u for %d.%d.INT%c does not match " 730 "previous BIOS IRQ %u\n", 731 sc->pl_name, bios_irq, (int)bus, slot, pin + 'A', 732 link->l_bios_irq); 733 ACPI_SERIAL_END(pci_link); 734 } 735 736 static ACPI_STATUS 737 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 738 { 739 ACPI_RESOURCE *resource, *end, newres, *resptr; 740 ACPI_BUFFER crsbuf; 741 ACPI_STATUS status; 742 struct link *link; 743 int i, in_dpf; 744 745 /* Fetch the _CRS. */ 746 crsbuf.Pointer = NULL; 747 crsbuf.Length = ACPI_ALLOCATE_BUFFER; 748 status = AcpiGetCurrentResources(sc->pl_handle, &crsbuf); 749 if (ACPI_SUCCESS(status) && crsbuf.Pointer == NULL) 750 status = AE_NO_MEMORY; 751 if (ACPI_FAILURE(status)) { 752 aprint_verbose("%s: Unable to fetch current resources: %s\n", 753 sc->pl_name, AcpiFormatException(status)); 754 return (status); 755 } 756 757 /* Fill in IRQ resources via link structures. */ 758 srsbuf->Pointer = NULL; 759 link = sc->pl_links; 760 i = 0; 761 in_dpf = DPF_OUTSIDE; 762 resource = (ACPI_RESOURCE *)crsbuf.Pointer; 763 end = (ACPI_RESOURCE *)((char *)crsbuf.Pointer + crsbuf.Length); 764 for (;;) { 765 switch (resource->Type) { 766 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 767 switch (in_dpf) { 768 case DPF_OUTSIDE: 769 /* We've started the first DPF. */ 770 in_dpf = DPF_FIRST; 771 break; 772 case DPF_FIRST: 773 /* We've started the second DPF. */ 774 panic( 775 "%s: Multiple dependent functions within a current resource", 776 __func__); 777 break; 778 } 779 resptr = NULL; 780 break; 781 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 782 /* We are finished with DPF parsing. */ 783 KASSERT(in_dpf != DPF_OUTSIDE); 784 in_dpf = DPF_OUTSIDE; 785 resptr = NULL; 786 break; 787 case ACPI_RESOURCE_TYPE_IRQ: 788 newres = link->l_prs_template; 789 resptr = &newres; 790 resptr->Data.Irq.InterruptCount = 1; 791 if (PCI_INTERRUPT_VALID(link->l_irq)) { 792 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS); 793 resptr->Data.Irq.Interrupts[0] = link->l_irq; 794 resptr->Data.Irq.Triggering = link->l_trig; 795 resptr->Data.Irq.Polarity = link->l_pol; 796 } else 797 resptr->Data.Irq.Interrupts[0] = 0; 798 link++; 799 i++; 800 break; 801 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 802 newres = link->l_prs_template; 803 resptr = &newres; 804 resptr->Data.ExtendedIrq.InterruptCount = 1; 805 if (PCI_INTERRUPT_VALID(link->l_irq)) { 806 resptr->Data.ExtendedIrq.Interrupts[0] = 807 link->l_irq; 808 resptr->Data.ExtendedIrq.Triggering = 809 link->l_trig; 810 resptr->Data.ExtendedIrq.Polarity = link->l_pol; 811 } else 812 resptr->Data.ExtendedIrq.Interrupts[0] = 0; 813 link++; 814 i++; 815 break; 816 default: 817 resptr = resource; 818 } 819 if (resptr != NULL) { 820 status = acpi_AppendBufferResource(srsbuf, resptr); 821 if (ACPI_FAILURE(status)) { 822 printf("%s: Unable to build resources: %s\n", 823 sc->pl_name, AcpiFormatException(status)); 824 if (srsbuf->Pointer != NULL) 825 AcpiOsFree(srsbuf->Pointer); 826 AcpiOsFree(crsbuf.Pointer); 827 return (status); 828 } 829 } 830 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 831 break; 832 resource = ACPI_NEXT_RESOURCE(resource); 833 if (resource >= end) 834 break; 835 } 836 AcpiOsFree(crsbuf.Pointer); 837 return (AE_OK); 838 } 839 840 static ACPI_STATUS 841 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, 842 ACPI_BUFFER *srsbuf) 843 { 844 ACPI_RESOURCE newres; 845 ACPI_STATUS status; 846 struct link *link; 847 int i; 848 849 /* Start off with an empty buffer. */ 850 srsbuf->Pointer = NULL; 851 link = sc->pl_links; 852 for (i = 0; i < sc->pl_num_links; i++) { 853 854 /* Add a new IRQ resource from each link. */ 855 link = &sc->pl_links[i]; 856 newres = link->l_prs_template; 857 if (newres.Type == ACPI_RESOURCE_TYPE_IRQ) { 858 859 /* Build an IRQ resource. */ 860 newres.Data.Irq.InterruptCount = 1; 861 if (PCI_INTERRUPT_VALID(link->l_irq)) { 862 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS); 863 newres.Data.Irq.Interrupts[0] = link->l_irq; 864 newres.Data.Irq.Triggering = link->l_trig; 865 newres.Data.Irq.Polarity = link->l_pol; 866 } else 867 newres.Data.Irq.Interrupts[0] = 0; 868 } else { 869 870 /* Build an ExtIRQ resuorce. */ 871 newres.Data.ExtendedIrq.InterruptCount = 1; 872 if (PCI_INTERRUPT_VALID(link->l_irq)) { 873 newres.Data.ExtendedIrq.Interrupts[0] = 874 link->l_irq; 875 newres.Data.ExtendedIrq.Triggering = 876 link->l_trig; 877 newres.Data.ExtendedIrq.Polarity = 878 link->l_pol; 879 } else { 880 newres.Data.ExtendedIrq.Interrupts[0] = 0; 881 } 882 } 883 884 /* Add the new resource to the end of the _SRS buffer. */ 885 status = acpi_AppendBufferResource(srsbuf, &newres); 886 if (ACPI_FAILURE(status)) { 887 printf("%s: Unable to build resources: %s\n", 888 sc->pl_name, AcpiFormatException(status)); 889 if (srsbuf->Pointer != NULL) 890 AcpiOsFree(srsbuf->Pointer); 891 return (status); 892 } 893 } 894 return (AE_OK); 895 } 896 897 static ACPI_STATUS 898 acpi_pci_link_srs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 899 { 900 ACPI_STATUS status; 901 902 if (sc->pl_crs_bad) 903 status = acpi_pci_link_srs_from_links(sc, srsbuf); 904 else 905 status = acpi_pci_link_srs_from_crs(sc, srsbuf); 906 907 /* Write out new resources via _SRS. */ 908 return AcpiSetCurrentResources(sc->pl_handle, srsbuf); 909 } 910 911 static ACPI_STATUS 912 acpi_pci_link_route_irqs(struct acpi_pci_link_softc *sc, int *irq, int *pol, 913 int *trig) 914 { 915 ACPI_RESOURCE *resource, *end; 916 ACPI_BUFFER srsbuf; 917 ACPI_STATUS status; 918 struct link *link; 919 int i, is_ext = 0; 920 921 status = acpi_pci_link_srs(sc, &srsbuf); 922 if (ACPI_FAILURE(status)) { 923 printf("%s: _SRS failed: %s\n", 924 sc->pl_name, AcpiFormatException(status)); 925 return (status); 926 } 927 /* 928 * Perform acpi_config_intr() on each IRQ resource if it was just 929 * routed for the first time. 930 */ 931 link = sc->pl_links; 932 i = 0; 933 resource = (ACPI_RESOURCE *)srsbuf.Pointer; 934 end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); 935 for (;;) { 936 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 937 break; 938 switch (resource->Type) { 939 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 940 is_ext = 1; 941 /* FALLTHROUGH */ 942 case ACPI_RESOURCE_TYPE_IRQ: 943 /* 944 * Only configure the interrupt and update the 945 * weights if this link has a valid IRQ and was 946 * previously unrouted. 947 */ 948 if (!link->l_routed && 949 PCI_INTERRUPT_VALID(link->l_irq)) { 950 *trig = is_ext ? 951 resource->Data.ExtendedIrq.Triggering : 952 resource->Data.Irq.Triggering; 953 *pol = is_ext ? 954 resource->Data.ExtendedIrq.Polarity : 955 resource->Data.Irq.Polarity; 956 *irq = is_ext ? 957 resource->Data.ExtendedIrq.Interrupts[0] : 958 resource->Data.Irq.Interrupts[0]; 959 link->l_routed = TRUE; 960 pci_link_interrupt_weights[link->l_irq] += 961 link->l_references; 962 } 963 link++; 964 i++; 965 break; 966 } 967 resource = ACPI_NEXT_RESOURCE(resource); 968 if (resource >= end) 969 break; 970 } 971 AcpiOsFree(srsbuf.Pointer); 972 return (AE_OK); 973 } 974 975 static void 976 acpi_pci_link_resume(int why, void *arg) 977 { 978 struct acpi_pci_link_softc *sc = arg; 979 ACPI_BUFFER srsbuf; 980 981 switch (why) { 982 case PWR_RESUME: 983 ACPI_SERIAL_BEGIN(pci_link); 984 if (ACPI_SUCCESS(acpi_pci_link_srs(sc, &srsbuf))) 985 AcpiOsFree(srsbuf.Pointer); 986 ACPI_SERIAL_END(pci_link); 987 default: 988 break; 989 } 990 } 991 992 /* 993 * Pick an IRQ to use for this unrouted link. 994 */ 995 static uint8_t 996 acpi_pci_link_choose_irq(struct acpi_pci_link_softc *sc, struct link *link) 997 { 998 u_int8_t best_irq, pos_irq; 999 int best_weight, pos_weight, i; 1000 1001 KASSERT(!link->l_routed); 1002 KASSERT(!PCI_INTERRUPT_VALID(link->l_irq)); 1003 1004 /* 1005 * If we have a valid BIOS IRQ, use that. We trust what the BIOS 1006 * says it routed over what _CRS says the link thinks is routed. 1007 */ 1008 if (PCI_INTERRUPT_VALID(link->l_bios_irq)) 1009 return (link->l_bios_irq); 1010 1011 /* 1012 * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, 1013 * then use that. 1014 */ 1015 if (PCI_INTERRUPT_VALID(link->l_initial_irq)) 1016 return (link->l_initial_irq); 1017 1018 /* 1019 * Ok, we have no useful hints, so we have to pick from the 1020 * possible IRQs. For ISA IRQs we only use interrupts that 1021 * have already been used by the BIOS. 1022 */ 1023 best_irq = PCI_INVALID_IRQ; 1024 best_weight = INT_MAX; 1025 for (i = 0; i < link->l_num_irqs; i++) { 1026 pos_irq = link->l_irqs[i]; 1027 if (pos_irq < NUM_ISA_INTERRUPTS && 1028 (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) 1029 continue; 1030 pos_weight = pci_link_interrupt_weights[pos_irq]; 1031 if (pos_weight < best_weight) { 1032 best_weight = pos_weight; 1033 best_irq = pos_irq; 1034 } 1035 } 1036 1037 /* 1038 * If this is an ISA IRQ, try using the SCI if it is also an ISA 1039 * interrupt as a fallback. 1040 */ 1041 if (link->l_isa_irq && !PCI_INTERRUPT_VALID(best_irq)) { 1042 pos_irq = AcpiGbl_FADT.SciInterrupt; 1043 pos_weight = pci_link_interrupt_weights[pos_irq]; 1044 if (pos_weight < best_weight) { 1045 best_weight = pos_weight; 1046 best_irq = pos_irq; 1047 } 1048 } 1049 1050 if (PCI_INTERRUPT_VALID(best_irq)) { 1051 aprint_verbose("%s: Picked IRQ %u with weight %d\n", 1052 sc->pl_name, best_irq, best_weight); 1053 } else 1054 printf("%s: Unable to choose an IRQ\n", sc->pl_name); 1055 return (best_irq); 1056 } 1057 1058 int 1059 acpi_pci_link_route_interrupt(void *v, int index, int *irq, int *pol, int *trig) 1060 { 1061 struct acpi_pci_link_softc *sc = v; 1062 struct link *link; 1063 int i; 1064 pcireg_t reg; 1065 1066 ACPI_SERIAL_BEGIN(pci_link); 1067 link = acpi_pci_link_lookup(sc, index); 1068 if (link == NULL) 1069 panic("%s: apparently invalid index %d", __func__, index); 1070 1071 /* 1072 * If this link device is already routed to an interrupt, just return 1073 * the interrupt it is routed to. 1074 */ 1075 if (link->l_routed) { 1076 KASSERT(PCI_INTERRUPT_VALID(link->l_irq)); 1077 ACPI_SERIAL_END(pci_link); 1078 *irq = link->l_irq; 1079 *pol = link->l_pol; 1080 *trig = link->l_trig; 1081 return (link->l_irq); 1082 } 1083 1084 /* Choose an IRQ if we need one. */ 1085 if (PCI_INTERRUPT_VALID(link->l_irq)) { 1086 *irq = link->l_irq; 1087 *pol = link->l_pol; 1088 *trig = link->l_trig; 1089 goto done; 1090 } 1091 1092 link->l_irq = acpi_pci_link_choose_irq(sc, link); 1093 1094 /* 1095 * Try to route the interrupt we picked. If it fails, then 1096 * assume the interrupt is not routed. 1097 */ 1098 if (!PCI_INTERRUPT_VALID(link->l_irq)) 1099 goto done; 1100 1101 acpi_pci_link_route_irqs(sc, irq, pol, trig); 1102 if (!link->l_routed) { 1103 link->l_irq = PCI_INVALID_IRQ; 1104 goto done; 1105 } 1106 1107 link->l_pol = *pol; 1108 link->l_trig = *trig; 1109 for (i = 0; i < link->l_dev_count; ++i) { 1110 reg = pci_conf_read(acpi_softc->sc_pc, link->l_devices[i], 1111 PCI_INTERRUPT_REG); 1112 reg &= ~(PCI_INTERRUPT_LINE_MASK << PCI_INTERRUPT_LINE_SHIFT); 1113 reg |= link->l_irq << PCI_INTERRUPT_LINE_SHIFT; 1114 pci_conf_write(acpi_softc->sc_pc, link->l_devices[i], 1115 PCI_INTERRUPT_REG, reg); 1116 } 1117 1118 done: 1119 ACPI_SERIAL_END(pci_link); 1120 1121 return (link->l_irq); 1122 } 1123 1124 /* 1125 * This is gross, but we abuse the identify routine to perform one-time 1126 * SYSINIT() style initialization for the driver. 1127 */ 1128 static void 1129 acpi_pci_link_init(struct acpi_pci_link_softc *sc) 1130 { 1131 ACPI_BUFFER buf; 1132 char acpipcilinkname[] = "acpi_pci_link"; 1133 1134 /* 1135 * If the SCI is an ISA IRQ, add it to the bitmask of known good 1136 * ISA IRQs. 1137 * 1138 * XXX: If we are using the APIC, the SCI might have been 1139 * rerouted to an APIC pin in which case this is invalid. However, 1140 * if we are using the APIC, we also shouldn't be having any PCI 1141 * interrupts routed via ISA IRQs, so this is probably ok. 1142 */ 1143 if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS) 1144 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt); 1145 1146 sc->pl_powerhook = powerhook_establish(acpipcilinkname, 1147 acpi_pci_link_resume, sc); 1148 if (sc->pl_powerhook == NULL) 1149 aprint_normal("can't establish powerhook\n"); 1150 1151 buf.Length = sizeof (sc->pl_name); 1152 buf.Pointer = sc->pl_name; 1153 1154 if (ACPI_FAILURE(AcpiGetName(sc->pl_handle, ACPI_SINGLE_NAME, &buf))) 1155 snprintf(sc->pl_name, sizeof (sc->pl_name), "%s", 1156 "ACPI link device"); 1157 1158 acpi_pci_link_attach(sc); 1159 } 1160 1161 void * 1162 acpi_pci_link_devbyhandle(ACPI_HANDLE handle) 1163 { 1164 struct acpi_pci_link_softc *sc; 1165 1166 TAILQ_FOREACH(sc, &acpi_pci_linkdevs, pl_list) { 1167 if (sc->pl_handle == handle) 1168 return sc; 1169 } 1170 1171 sc = malloc(sizeof (*sc), M_PCI_LINK, M_NOWAIT|M_ZERO); 1172 if (sc == NULL) 1173 return NULL; 1174 1175 sc->pl_handle = handle; 1176 1177 acpi_pci_link_init(sc); 1178 1179 TAILQ_INSERT_TAIL(&acpi_pci_linkdevs, sc, pl_list); 1180 1181 return (void *)sc; 1182 } 1183 1184 ACPI_HANDLE 1185 acpi_pci_link_handle(void *v) 1186 { 1187 struct acpi_pci_link_softc *sc = v; 1188 1189 return sc->pl_handle; 1190 } 1191 1192 char * 1193 acpi_pci_link_name(void *v) 1194 { 1195 struct acpi_pci_link_softc *sc = v; 1196 1197 return sc->pl_name; 1198 } 1199 1200 1201 /* 1202 * Append an ACPI_RESOURCE to an ACPI_BUFFER. 1203 * 1204 * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER 1205 * provided to contain it. If the ACPI_BUFFER is empty, allocate a sensible 1206 * backing block. If the ACPI_RESOURCE is NULL, return an empty set of 1207 * resources. 1208 */ 1209 #define ACPI_INITIAL_RESOURCE_BUFFER_SIZE 512 1210 1211 static ACPI_STATUS 1212 acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res) 1213 { 1214 ACPI_RESOURCE *rp; 1215 void *newp; 1216 1217 /* Initialise the buffer if necessary. */ 1218 if (buf->Pointer == NULL) { 1219 buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE; 1220 if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL) 1221 return (AE_NO_MEMORY); 1222 rp = (ACPI_RESOURCE *)buf->Pointer; 1223 rp->Type = ACPI_RESOURCE_TYPE_END_TAG; 1224 rp->Length = 0; 1225 } 1226 1227 if (res == NULL) 1228 return (AE_OK); 1229 1230 /* 1231 * Scan the current buffer looking for the terminator. 1232 * This will either find the terminator or hit the end 1233 * of the buffer and return an error. 1234 */ 1235 rp = (ACPI_RESOURCE *)buf->Pointer; 1236 for (;;) { 1237 /* Range check, don't go outside the buffer */ 1238 if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + 1239 buf->Length)) 1240 return (AE_BAD_PARAMETER); 1241 if (rp->Type == ACPI_RESOURCE_TYPE_END_TAG || rp->Length == 0) 1242 break; 1243 rp = ACPI_NEXT_RESOURCE(rp); 1244 } 1245 1246 /* 1247 * Check the size of the buffer and expand if required. 1248 * 1249 * Required size is: 1250 * size of existing resources before terminator + 1251 * size of new resource and header + 1252 * size of terminator. 1253 * 1254 * Note that this loop should really only run once, unless 1255 * for some reason we are stuffing a *really* huge resource. 1256 */ 1257 while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 1258 res->Length + ACPI_RS_SIZE_NO_DATA + 1259 ACPI_RS_SIZE_MIN) >= buf->Length) { 1260 if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL) 1261 return (AE_NO_MEMORY); 1262 memcpy(newp, buf->Pointer, buf->Length); 1263 rp = (ACPI_RESOURCE *)((u_int8_t *)newp + 1264 ((u_int8_t *)rp - (u_int8_t *)buf->Pointer)); 1265 AcpiOsFree(buf->Pointer); 1266 buf->Pointer = newp; 1267 buf->Length += buf->Length; 1268 } 1269 1270 /* Insert the new resource. */ 1271 memcpy(rp, res, res->Length + ACPI_RS_SIZE_NO_DATA); 1272 1273 /* And add the terminator. */ 1274 rp = ACPI_NEXT_RESOURCE(rp); 1275 rp->Type = ACPI_RESOURCE_TYPE_END_TAG; 1276 rp->Length = 0; 1277 1278 return (AE_OK); 1279 } 1280