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sys/dev/acpica/acpi_pci_link.c
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1 /*- 2 * Copyright (c) 2002 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_acpi.h" 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/limits.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 38 #include <contrib/dev/acpica/include/acpi.h> 39 40 #include <dev/acpica/acpivar.h> 41 #include <dev/acpica/acpi_pcibvar.h> 42 43 #include <machine/pci_cfgreg.h> 44 #include <dev/pci/pcireg.h> 45 #include <dev/pci/pcivar.h> 46 #include "pcib_if.h" 47 48 /* Hooks for the ACPI CA debugging infrastructure. */ 49 #define _COMPONENT ACPI_BUS 50 ACPI_MODULE_NAME("PCI_LINK") 51 52 ACPI_SERIAL_DECL(pci_link, "ACPI PCI link"); 53 54 #define NUM_ISA_INTERRUPTS 16 55 #define NUM_ACPI_INTERRUPTS 256 56 57 /* 58 * An ACPI PCI link device may contain multiple links. Each link has its 59 * own ACPI resource. _PRT entries specify which link is being used via 60 * the Source Index. 61 * 62 * XXX: A note about Source Indices and DPFs: Currently we assume that 63 * the DPF start and end tags are not counted towards the index that 64 * Source Index corresponds to. Also, we assume that when DPFs are in use 65 * they various sets overlap in terms of Indices. Here's an example 66 * resource list indicating these assumptions: 67 * 68 * Resource Index 69 * -------- ----- 70 * I/O Port 0 71 * Start DPF - 72 * IRQ 1 73 * MemIO 2 74 * Start DPF - 75 * IRQ 1 76 * MemIO 2 77 * End DPF - 78 * DMA Channel 3 79 * 80 * The XXX is because I'm not sure if this is a valid assumption to make. 81 */ 82 83 /* States during DPF processing. */ 84 #define DPF_OUTSIDE 0 85 #define DPF_FIRST 1 86 #define DPF_IGNORE 2 87 88 struct link; 89 90 struct acpi_pci_link_softc { 91 int pl_num_links; 92 int pl_crs_bad; 93 struct link *pl_links; 94 device_t pl_dev; 95 }; 96 97 struct link { 98 struct acpi_pci_link_softc *l_sc; 99 uint8_t l_bios_irq; 100 uint8_t l_irq; 101 uint8_t l_initial_irq; 102 UINT32 l_crs_type; 103 int l_res_index; 104 int l_num_irqs; 105 int *l_irqs; 106 int l_references; 107 int l_routed:1; 108 int l_isa_irq:1; 109 ACPI_RESOURCE l_prs_template; 110 }; 111 112 struct link_count_request { 113 int in_dpf; 114 int count; 115 }; 116 117 struct link_res_request { 118 struct acpi_pci_link_softc *sc; 119 int in_dpf; 120 int res_index; 121 int link_index; 122 }; 123 124 static MALLOC_DEFINE(M_PCI_LINK, "pci_link", "ACPI PCI Link structures"); 125 126 static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS]; 127 static int pci_link_bios_isa_irqs; 128 129 static char *pci_link_ids[] = { "PNP0C0F", NULL }; 130 131 /* 132 * Fetch the short name associated with an ACPI handle and save it in the 133 * passed in buffer. 134 */ 135 static ACPI_STATUS 136 acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen) 137 { 138 ACPI_BUFFER buf; 139 140 buf.Length = buflen; 141 buf.Pointer = buffer; 142 return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf)); 143 } 144 145 static int 146 acpi_pci_link_probe(device_t dev) 147 { 148 char descr[28], name[12]; 149 int rv; 150 151 /* 152 * We explicitly do not check _STA since not all systems set it to 153 * sensible values. 154 */ 155 if (acpi_disabled("pci_link")) 156 return (ENXIO); 157 rv = ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids, NULL); 158 if (rv > 0) 159 return (rv); 160 161 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), name, 162 sizeof(name)))) { 163 snprintf(descr, sizeof(descr), "ACPI PCI Link %s", name); 164 device_set_desc_copy(dev, descr); 165 } else 166 device_set_desc(dev, "ACPI PCI Link"); 167 device_quiet(dev); 168 return (rv); 169 } 170 171 static ACPI_STATUS 172 acpi_count_irq_resources(ACPI_RESOURCE *res, void *context) 173 { 174 struct link_count_request *req; 175 176 req = (struct link_count_request *)context; 177 switch (res->Type) { 178 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 179 switch (req->in_dpf) { 180 case DPF_OUTSIDE: 181 /* We've started the first DPF. */ 182 req->in_dpf = DPF_FIRST; 183 break; 184 case DPF_FIRST: 185 /* We've started the second DPF. */ 186 req->in_dpf = DPF_IGNORE; 187 break; 188 } 189 break; 190 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 191 /* We are finished with DPF parsing. */ 192 KASSERT(req->in_dpf != DPF_OUTSIDE, 193 ("%s: end dpf when not parsing a dpf", __func__)); 194 req->in_dpf = DPF_OUTSIDE; 195 break; 196 case ACPI_RESOURCE_TYPE_IRQ: 197 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 198 /* 199 * Don't count resources if we are in a DPF set that we are 200 * ignoring. 201 */ 202 if (req->in_dpf != DPF_IGNORE) 203 req->count++; 204 } 205 return (AE_OK); 206 } 207 208 static ACPI_STATUS 209 link_add_crs(ACPI_RESOURCE *res, void *context) 210 { 211 struct link_res_request *req; 212 struct link *link; 213 214 ACPI_SERIAL_ASSERT(pci_link); 215 req = (struct link_res_request *)context; 216 switch (res->Type) { 217 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 218 switch (req->in_dpf) { 219 case DPF_OUTSIDE: 220 /* We've started the first DPF. */ 221 req->in_dpf = DPF_FIRST; 222 break; 223 case DPF_FIRST: 224 /* We've started the second DPF. */ 225 panic( 226 "%s: Multiple dependent functions within a current resource", 227 __func__); 228 break; 229 } 230 break; 231 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 232 /* We are finished with DPF parsing. */ 233 KASSERT(req->in_dpf != DPF_OUTSIDE, 234 ("%s: end dpf when not parsing a dpf", __func__)); 235 req->in_dpf = DPF_OUTSIDE; 236 break; 237 case ACPI_RESOURCE_TYPE_IRQ: 238 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 239 KASSERT(req->link_index < req->sc->pl_num_links, 240 ("%s: array boundary violation", __func__)); 241 link = &req->sc->pl_links[req->link_index]; 242 link->l_res_index = req->res_index; 243 link->l_crs_type = res->Type; 244 req->link_index++; 245 req->res_index++; 246 247 /* 248 * Only use the current value if there's one IRQ. Some 249 * systems return multiple IRQs (which is nonsense for _CRS) 250 * when the link hasn't been programmed. 251 */ 252 if (res->Type == ACPI_RESOURCE_TYPE_IRQ) { 253 if (res->Data.Irq.InterruptCount == 1) 254 link->l_irq = res->Data.Irq.Interrupts[0]; 255 } else if (res->Data.ExtendedIrq.InterruptCount == 1) 256 link->l_irq = res->Data.ExtendedIrq.Interrupts[0]; 257 258 /* 259 * An IRQ of zero means that the link isn't routed. 260 */ 261 if (link->l_irq == 0) 262 link->l_irq = PCI_INVALID_IRQ; 263 break; 264 default: 265 req->res_index++; 266 } 267 return (AE_OK); 268 } 269 270 /* 271 * Populate the set of possible IRQs for each device. 272 */ 273 static ACPI_STATUS 274 link_add_prs(ACPI_RESOURCE *res, void *context) 275 { 276 ACPI_RESOURCE *tmp; 277 struct link_res_request *req; 278 struct link *link; 279 UINT8 *irqs = NULL; 280 UINT32 *ext_irqs = NULL; 281 int i, is_ext_irq = 1; 282 283 ACPI_SERIAL_ASSERT(pci_link); 284 req = (struct link_res_request *)context; 285 switch (res->Type) { 286 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 287 switch (req->in_dpf) { 288 case DPF_OUTSIDE: 289 /* We've started the first DPF. */ 290 req->in_dpf = DPF_FIRST; 291 break; 292 case DPF_FIRST: 293 /* We've started the second DPF. */ 294 req->in_dpf = DPF_IGNORE; 295 break; 296 } 297 break; 298 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 299 /* We are finished with DPF parsing. */ 300 KASSERT(req->in_dpf != DPF_OUTSIDE, 301 ("%s: end dpf when not parsing a dpf", __func__)); 302 req->in_dpf = DPF_OUTSIDE; 303 break; 304 case ACPI_RESOURCE_TYPE_IRQ: 305 is_ext_irq = 0; 306 /* fall through */ 307 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 308 /* 309 * Don't parse resources if we are in a DPF set that we are 310 * ignoring. 311 */ 312 if (req->in_dpf == DPF_IGNORE) 313 break; 314 315 KASSERT(req->link_index < req->sc->pl_num_links, 316 ("%s: array boundary violation", __func__)); 317 link = &req->sc->pl_links[req->link_index]; 318 if (link->l_res_index == -1) { 319 KASSERT(req->sc->pl_crs_bad, 320 ("res_index should be set")); 321 link->l_res_index = req->res_index; 322 } 323 req->link_index++; 324 req->res_index++; 325 326 /* 327 * Stash a copy of the resource for later use when doing 328 * _SRS. 329 */ 330 tmp = &link->l_prs_template; 331 if (is_ext_irq) { 332 bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.ExtendedIrq)); 333 334 /* 335 * XXX acpi_AppendBufferResource() cannot handle 336 * optional data. 337 */ 338 bzero(&tmp->Data.ExtendedIrq.ResourceSource, 339 sizeof(tmp->Data.ExtendedIrq.ResourceSource)); 340 tmp->Length = ACPI_RS_SIZE(tmp->Data.ExtendedIrq); 341 342 link->l_num_irqs = 343 res->Data.ExtendedIrq.InterruptCount; 344 ext_irqs = res->Data.ExtendedIrq.Interrupts; 345 } else { 346 bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.Irq)); 347 link->l_num_irqs = res->Data.Irq.InterruptCount; 348 irqs = res->Data.Irq.Interrupts; 349 } 350 if (link->l_num_irqs == 0) 351 break; 352 353 /* 354 * Save a list of the valid IRQs. Also, if all of the 355 * valid IRQs are ISA IRQs, then mark this link as 356 * routed via an ISA interrupt. 357 */ 358 link->l_isa_irq = TRUE; 359 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, 360 M_PCI_LINK, M_WAITOK | M_ZERO); 361 for (i = 0; i < link->l_num_irqs; i++) { 362 if (is_ext_irq) { 363 link->l_irqs[i] = ext_irqs[i]; 364 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS) 365 link->l_isa_irq = FALSE; 366 } else { 367 link->l_irqs[i] = irqs[i]; 368 if (irqs[i] >= NUM_ISA_INTERRUPTS) 369 link->l_isa_irq = FALSE; 370 } 371 } 372 373 /* 374 * If this is not an ISA IRQ but _CRS used a non-extended 375 * IRQ descriptor, don't use _CRS as a template for _SRS. 376 */ 377 if (!req->sc->pl_crs_bad && !link->l_isa_irq && 378 link->l_crs_type == ACPI_RESOURCE_TYPE_IRQ) 379 req->sc->pl_crs_bad = TRUE; 380 break; 381 default: 382 if (req->in_dpf == DPF_IGNORE) 383 break; 384 if (req->sc->pl_crs_bad) 385 device_printf(req->sc->pl_dev, 386 "Warning: possible resource %d will be lost during _SRS\n", 387 req->res_index); 388 req->res_index++; 389 } 390 return (AE_OK); 391 } 392 393 static int 394 link_valid_irq(struct link *link, int irq) 395 { 396 int i; 397 398 ACPI_SERIAL_ASSERT(pci_link); 399 400 /* Invalid interrupts are never valid. */ 401 if (!PCI_INTERRUPT_VALID(irq)) 402 return (FALSE); 403 404 /* Any interrupt in the list of possible interrupts is valid. */ 405 for (i = 0; i < link->l_num_irqs; i++) 406 if (link->l_irqs[i] == irq) 407 return (TRUE); 408 409 /* 410 * For links routed via an ISA interrupt, if the SCI is routed via 411 * an ISA interrupt, the SCI is always treated as a valid IRQ. 412 */ 413 if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq && 414 irq < NUM_ISA_INTERRUPTS) 415 return (TRUE); 416 417 /* If the interrupt wasn't found in the list it is not valid. */ 418 return (FALSE); 419 } 420 421 static void 422 acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag) 423 { 424 struct link *link; 425 char buf[16]; 426 int i, j; 427 428 ACPI_SERIAL_ASSERT(pci_link); 429 if (header) { 430 snprintf(buf, sizeof(buf), "%s:", 431 device_get_nameunit(sc->pl_dev)); 432 printf("%-16.16s Index IRQ Rtd Ref IRQs\n", buf); 433 } 434 for (i = 0; i < sc->pl_num_links; i++) { 435 link = &sc->pl_links[i]; 436 printf(" %-14.14s %5d %3d %c %3d ", i == 0 ? tag : "", i, 437 link->l_irq, link->l_routed ? 'Y' : 'N', 438 link->l_references); 439 if (link->l_num_irqs == 0) 440 printf(" none"); 441 else for (j = 0; j < link->l_num_irqs; j++) 442 printf(" %d", link->l_irqs[j]); 443 printf("\n"); 444 } 445 } 446 447 static int 448 acpi_pci_link_attach(device_t dev) 449 { 450 struct acpi_pci_link_softc *sc; 451 struct link_count_request creq; 452 struct link_res_request rreq; 453 ACPI_STATUS status; 454 int i; 455 456 sc = device_get_softc(dev); 457 sc->pl_dev = dev; 458 ACPI_SERIAL_BEGIN(pci_link); 459 460 /* 461 * Count the number of current resources so we know how big of 462 * a link array to allocate. On some systems, _CRS is broken, 463 * so for those systems try to derive the count from _PRS instead. 464 */ 465 creq.in_dpf = DPF_OUTSIDE; 466 creq.count = 0; 467 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 468 acpi_count_irq_resources, &creq); 469 sc->pl_crs_bad = ACPI_FAILURE(status); 470 if (sc->pl_crs_bad) { 471 creq.in_dpf = DPF_OUTSIDE; 472 creq.count = 0; 473 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 474 acpi_count_irq_resources, &creq); 475 if (ACPI_FAILURE(status)) { 476 device_printf(dev, 477 "Unable to parse _CRS or _PRS: %s\n", 478 AcpiFormatException(status)); 479 ACPI_SERIAL_END(pci_link); 480 return (ENXIO); 481 } 482 } 483 sc->pl_num_links = creq.count; 484 if (creq.count == 0) { 485 ACPI_SERIAL_END(pci_link); 486 return (0); 487 } 488 sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links, 489 M_PCI_LINK, M_WAITOK | M_ZERO); 490 491 /* Initialize the child links. */ 492 for (i = 0; i < sc->pl_num_links; i++) { 493 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 494 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ; 495 sc->pl_links[i].l_sc = sc; 496 sc->pl_links[i].l_isa_irq = FALSE; 497 sc->pl_links[i].l_res_index = -1; 498 } 499 500 /* Try to read the current settings from _CRS if it is valid. */ 501 if (!sc->pl_crs_bad) { 502 rreq.in_dpf = DPF_OUTSIDE; 503 rreq.link_index = 0; 504 rreq.res_index = 0; 505 rreq.sc = sc; 506 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 507 link_add_crs, &rreq); 508 if (ACPI_FAILURE(status)) { 509 device_printf(dev, "Unable to parse _CRS: %s\n", 510 AcpiFormatException(status)); 511 goto fail; 512 } 513 } 514 515 /* 516 * Try to read the possible settings from _PRS. Note that if the 517 * _CRS is toast, we depend on having a working _PRS. However, if 518 * _CRS works, then it is ok for _PRS to be missing. 519 */ 520 rreq.in_dpf = DPF_OUTSIDE; 521 rreq.link_index = 0; 522 rreq.res_index = 0; 523 rreq.sc = sc; 524 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 525 link_add_prs, &rreq); 526 if (ACPI_FAILURE(status) && 527 (status != AE_NOT_FOUND || sc->pl_crs_bad)) { 528 device_printf(dev, "Unable to parse _PRS: %s\n", 529 AcpiFormatException(status)); 530 goto fail; 531 } 532 if (bootverbose) 533 acpi_pci_link_dump(sc, 1, "Initial Probe"); 534 535 /* Verify initial IRQs if we have _PRS. */ 536 if (status != AE_NOT_FOUND) 537 for (i = 0; i < sc->pl_num_links; i++) 538 if (!link_valid_irq(&sc->pl_links[i], 539 sc->pl_links[i].l_irq)) 540 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 541 if (bootverbose) 542 acpi_pci_link_dump(sc, 0, "Validation"); 543 544 /* Save initial IRQs. */ 545 for (i = 0; i < sc->pl_num_links; i++) 546 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; 547 548 /* 549 * Try to disable this link. If successful, set the current IRQ to 550 * zero and flags to indicate this link is not routed. If we can't 551 * run _DIS (i.e., the method doesn't exist), assume the initial 552 * IRQ was routed by the BIOS. 553 */ 554 if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, 555 NULL))) 556 for (i = 0; i < sc->pl_num_links; i++) 557 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 558 else 559 for (i = 0; i < sc->pl_num_links; i++) 560 if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) 561 sc->pl_links[i].l_routed = TRUE; 562 if (bootverbose) 563 acpi_pci_link_dump(sc, 0, "After Disable"); 564 ACPI_SERIAL_END(pci_link); 565 return (0); 566 fail: 567 ACPI_SERIAL_END(pci_link); 568 for (i = 0; i < sc->pl_num_links; i++) 569 if (sc->pl_links[i].l_irqs != NULL) 570 free(sc->pl_links[i].l_irqs, M_PCI_LINK); 571 free(sc->pl_links, M_PCI_LINK); 572 return (ENXIO); 573 } 574 575 /* XXX: Note that this is identical to pci_pir_search_irq(). */ 576 static uint8_t 577 acpi_pci_link_search_irq(int bus, int device, int pin) 578 { 579 uint32_t value; 580 uint8_t func, maxfunc; 581 582 /* See if we have a valid device at function 0. */ 583 value = pci_cfgregread(bus, device, 0, PCIR_VENDOR, 2); 584 if (value == PCIV_INVALID) 585 return (PCI_INVALID_IRQ); 586 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 587 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 588 return (PCI_INVALID_IRQ); 589 if (value & PCIM_MFDEV) 590 maxfunc = PCI_FUNCMAX; 591 else 592 maxfunc = 0; 593 594 /* Scan all possible functions at this device. */ 595 for (func = 0; func <= maxfunc; func++) { 596 value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2); 597 if (value == PCIV_INVALID) 598 continue; 599 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 600 601 /* 602 * See if it uses the pin in question. Note that the passed 603 * in pin uses 0 for A, .. 3 for D whereas the intpin 604 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 605 */ 606 if (value != pin + 1) 607 continue; 608 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 609 if (bootverbose) 610 printf( 611 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n", 612 bus, device, pin + 'A', func, value); 613 if (value != PCI_INVALID_IRQ) 614 return (value); 615 } 616 return (PCI_INVALID_IRQ); 617 } 618 619 /* 620 * Find the link structure that corresponds to the resource index passed in 621 * via 'source_index'. 622 */ 623 static struct link * 624 acpi_pci_link_lookup(device_t dev, int source_index) 625 { 626 struct acpi_pci_link_softc *sc; 627 int i; 628 629 ACPI_SERIAL_ASSERT(pci_link); 630 sc = device_get_softc(dev); 631 for (i = 0; i < sc->pl_num_links; i++) 632 if (sc->pl_links[i].l_res_index == source_index) 633 return (&sc->pl_links[i]); 634 return (NULL); 635 } 636 637 void 638 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot, 639 int pin) 640 { 641 struct link *link; 642 uint8_t bios_irq; 643 uintptr_t bus; 644 645 /* 646 * Look up the PCI bus for the specified PCI bridge device. Note 647 * that the PCI bridge device might not have any children yet. 648 * However, looking up its bus number doesn't require a valid child 649 * device, so we just pass NULL. 650 */ 651 if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) { 652 device_printf(pcib, "Unable to read PCI bus number"); 653 panic("PCI bridge without a bus number"); 654 } 655 656 /* Bump the reference count. */ 657 ACPI_SERIAL_BEGIN(pci_link); 658 link = acpi_pci_link_lookup(dev, index); 659 if (link == NULL) { 660 device_printf(dev, "apparently invalid index %d\n", index); 661 ACPI_SERIAL_END(pci_link); 662 return; 663 } 664 link->l_references++; 665 if (link->l_routed) 666 pci_link_interrupt_weights[link->l_irq]++; 667 668 /* 669 * The BIOS only routes interrupts via ISA IRQs using the ATPICs 670 * (8259As). Thus, if this link is routed via an ISA IRQ, go 671 * look to see if the BIOS routed an IRQ for this link at the 672 * indicated (bus, slot, pin). If so, we prefer that IRQ for 673 * this link and add that IRQ to our list of known-good IRQs. 674 * This provides a good work-around for link devices whose _CRS 675 * method is either broken or bogus. We only use the value 676 * returned by _CRS if we can't find a valid IRQ via this method 677 * in fact. 678 * 679 * If this link is not routed via an ISA IRQ (because we are using 680 * APIC for example), then don't bother looking up the BIOS IRQ 681 * as if we find one it won't be valid anyway. 682 */ 683 if (!link->l_isa_irq) { 684 ACPI_SERIAL_END(pci_link); 685 return; 686 } 687 688 /* Try to find a BIOS IRQ setting from any matching devices. */ 689 bios_irq = acpi_pci_link_search_irq(bus, slot, pin); 690 if (!PCI_INTERRUPT_VALID(bios_irq)) { 691 ACPI_SERIAL_END(pci_link); 692 return; 693 } 694 695 /* Validate the BIOS IRQ. */ 696 if (!link_valid_irq(link, bios_irq)) { 697 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n", 698 bios_irq, (int)bus, slot, pin + 'A'); 699 } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { 700 link->l_bios_irq = bios_irq; 701 if (bios_irq < NUM_ISA_INTERRUPTS) 702 pci_link_bios_isa_irqs |= (1 << bios_irq); 703 if (bios_irq != link->l_initial_irq && 704 PCI_INTERRUPT_VALID(link->l_initial_irq)) 705 device_printf(dev, 706 "BIOS IRQ %u does not match initial IRQ %u\n", 707 bios_irq, link->l_initial_irq); 708 } else if (bios_irq != link->l_bios_irq) 709 device_printf(dev, 710 "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n", 711 bios_irq, (int)bus, slot, pin + 'A', 712 link->l_bios_irq); 713 ACPI_SERIAL_END(pci_link); 714 } 715 716 static ACPI_STATUS 717 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 718 { 719 ACPI_RESOURCE *end, *res; 720 ACPI_STATUS status; 721 struct link *link; 722 int i __diagused, in_dpf; 723 724 /* Fetch the _CRS. */ 725 ACPI_SERIAL_ASSERT(pci_link); 726 srsbuf->Pointer = NULL; 727 srsbuf->Length = ACPI_ALLOCATE_BUFFER; 728 status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), srsbuf); 729 if (ACPI_SUCCESS(status) && srsbuf->Pointer == NULL) 730 status = AE_NO_MEMORY; 731 if (ACPI_FAILURE(status)) { 732 if (bootverbose) 733 device_printf(sc->pl_dev, 734 "Unable to fetch current resources: %s\n", 735 AcpiFormatException(status)); 736 return (status); 737 } 738 739 /* Fill in IRQ resources via link structures. */ 740 link = sc->pl_links; 741 i = 0; 742 in_dpf = DPF_OUTSIDE; 743 res = (ACPI_RESOURCE *)srsbuf->Pointer; 744 end = (ACPI_RESOURCE *)((char *)srsbuf->Pointer + srsbuf->Length); 745 for (;;) { 746 switch (res->Type) { 747 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 748 switch (in_dpf) { 749 case DPF_OUTSIDE: 750 /* We've started the first DPF. */ 751 in_dpf = DPF_FIRST; 752 break; 753 case DPF_FIRST: 754 /* We've started the second DPF. */ 755 panic( 756 "%s: Multiple dependent functions within a current resource", 757 __func__); 758 break; 759 } 760 break; 761 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 762 /* We are finished with DPF parsing. */ 763 KASSERT(in_dpf != DPF_OUTSIDE, 764 ("%s: end dpf when not parsing a dpf", __func__)); 765 in_dpf = DPF_OUTSIDE; 766 break; 767 case ACPI_RESOURCE_TYPE_IRQ: 768 MPASS(i < sc->pl_num_links); 769 res->Data.Irq.InterruptCount = 1; 770 if (PCI_INTERRUPT_VALID(link->l_irq)) { 771 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 772 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 773 __func__, link->l_irq)); 774 res->Data.Irq.Interrupts[0] = link->l_irq; 775 } else 776 res->Data.Irq.Interrupts[0] = 0; 777 link++; 778 i++; 779 break; 780 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 781 MPASS(i < sc->pl_num_links); 782 res->Data.ExtendedIrq.InterruptCount = 1; 783 if (PCI_INTERRUPT_VALID(link->l_irq)) 784 res->Data.ExtendedIrq.Interrupts[0] = 785 link->l_irq; 786 else 787 res->Data.ExtendedIrq.Interrupts[0] = 0; 788 link++; 789 i++; 790 break; 791 } 792 if (res->Type == ACPI_RESOURCE_TYPE_END_TAG) 793 break; 794 res = ACPI_NEXT_RESOURCE(res); 795 if (res >= end) 796 break; 797 } 798 return (AE_OK); 799 } 800 801 static ACPI_STATUS 802 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, 803 ACPI_BUFFER *srsbuf) 804 { 805 ACPI_RESOURCE newres; 806 ACPI_STATUS status; 807 struct link *link; 808 int i; 809 810 /* Start off with an empty buffer. */ 811 srsbuf->Pointer = NULL; 812 link = sc->pl_links; 813 for (i = 0; i < sc->pl_num_links; i++) { 814 /* Add a new IRQ resource from each link. */ 815 link = &sc->pl_links[i]; 816 if (link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ) { 817 /* Build an IRQ resource. */ 818 bcopy(&link->l_prs_template, &newres, 819 ACPI_RS_SIZE(newres.Data.Irq)); 820 newres.Data.Irq.InterruptCount = 1; 821 if (PCI_INTERRUPT_VALID(link->l_irq)) { 822 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 823 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 824 __func__, link->l_irq)); 825 newres.Data.Irq.Interrupts[0] = link->l_irq; 826 } else 827 newres.Data.Irq.Interrupts[0] = 0; 828 } else { 829 /* Build an ExtIRQ resuorce. */ 830 bcopy(&link->l_prs_template, &newres, 831 ACPI_RS_SIZE(newres.Data.ExtendedIrq)); 832 newres.Data.ExtendedIrq.InterruptCount = 1; 833 if (PCI_INTERRUPT_VALID(link->l_irq)) 834 newres.Data.ExtendedIrq.Interrupts[0] = 835 link->l_irq; 836 else 837 newres.Data.ExtendedIrq.Interrupts[0] = 0; 838 } 839 840 /* Add the new resource to the end of the _SRS buffer. */ 841 status = acpi_AppendBufferResource(srsbuf, &newres); 842 if (ACPI_FAILURE(status)) { 843 device_printf(sc->pl_dev, 844 "Unable to build resources: %s\n", 845 AcpiFormatException(status)); 846 if (srsbuf->Pointer != NULL) { 847 AcpiOsFree(srsbuf->Pointer); 848 srsbuf->Pointer = NULL; 849 } 850 return (status); 851 } 852 } 853 return (AE_OK); 854 } 855 856 static ACPI_STATUS 857 acpi_pci_link_route_irqs(device_t dev) 858 { 859 struct acpi_pci_link_softc *sc; 860 ACPI_RESOURCE *resource, *end; 861 ACPI_BUFFER srsbuf; 862 ACPI_STATUS status; 863 struct link *link; 864 int i __diagused; 865 866 ACPI_SERIAL_ASSERT(pci_link); 867 sc = device_get_softc(dev); 868 if (sc->pl_crs_bad) 869 status = acpi_pci_link_srs_from_links(sc, &srsbuf); 870 else 871 status = acpi_pci_link_srs_from_crs(sc, &srsbuf); 872 if (ACPI_FAILURE(status)) 873 return (status); 874 875 /* Write out new resources via _SRS. */ 876 status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf); 877 if (ACPI_FAILURE(status)) { 878 device_printf(dev, "Unable to route IRQs: %s\n", 879 AcpiFormatException(status)); 880 AcpiOsFree(srsbuf.Pointer); 881 return (status); 882 } 883 884 /* 885 * Perform acpi_config_intr() on each IRQ resource if it was just 886 * routed for the first time. 887 */ 888 link = sc->pl_links; 889 i = 0; 890 resource = (ACPI_RESOURCE *)srsbuf.Pointer; 891 end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); 892 for (;;) { 893 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 894 break; 895 switch (resource->Type) { 896 case ACPI_RESOURCE_TYPE_IRQ: 897 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 898 MPASS(i < sc->pl_num_links); 899 900 /* 901 * Only configure the interrupt and update the 902 * weights if this link has a valid IRQ and was 903 * previously unrouted. 904 */ 905 if (!link->l_routed && 906 PCI_INTERRUPT_VALID(link->l_irq)) { 907 link->l_routed = TRUE; 908 acpi_config_intr(dev, resource); 909 pci_link_interrupt_weights[link->l_irq] += 910 link->l_references; 911 } 912 link++; 913 i++; 914 break; 915 } 916 resource = ACPI_NEXT_RESOURCE(resource); 917 if (resource >= end) 918 break; 919 } 920 AcpiOsFree(srsbuf.Pointer); 921 return (AE_OK); 922 } 923 924 static int 925 acpi_pci_link_resume(device_t dev) 926 { 927 struct acpi_pci_link_softc *sc; 928 ACPI_STATUS status; 929 int i, routed; 930 931 /* 932 * If all of our links are routed, then restore the link via _SRS, 933 * otherwise, disable the link via _DIS. 934 */ 935 ACPI_SERIAL_BEGIN(pci_link); 936 sc = device_get_softc(dev); 937 routed = 0; 938 for (i = 0; i < sc->pl_num_links; i++) 939 if (sc->pl_links[i].l_routed) 940 routed++; 941 if (routed == sc->pl_num_links) 942 status = acpi_pci_link_route_irqs(dev); 943 else { 944 AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL); 945 status = AE_OK; 946 } 947 ACPI_SERIAL_END(pci_link); 948 if (ACPI_FAILURE(status)) 949 return (ENXIO); 950 else 951 return (0); 952 } 953 954 /* 955 * Pick an IRQ to use for this unrouted link. 956 */ 957 static uint8_t 958 acpi_pci_link_choose_irq(device_t dev, struct link *link) 959 { 960 char tunable_buffer[64], link_name[5]; 961 u_int8_t best_irq, pos_irq; 962 int best_weight, pos_weight, i; 963 964 KASSERT(!link->l_routed, ("%s: link already routed", __func__)); 965 KASSERT(!PCI_INTERRUPT_VALID(link->l_irq), 966 ("%s: link already has an IRQ", __func__)); 967 968 /* Check for a tunable override. */ 969 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name, 970 sizeof(link_name)))) { 971 snprintf(tunable_buffer, sizeof(tunable_buffer), 972 "hw.pci.link.%s.%d.irq", link_name, link->l_res_index); 973 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 974 if (!link_valid_irq(link, i)) 975 device_printf(dev, 976 "Warning, IRQ %d is not listed as valid\n", 977 i); 978 return (i); 979 } 980 snprintf(tunable_buffer, sizeof(tunable_buffer), 981 "hw.pci.link.%s.irq", link_name); 982 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 983 if (!link_valid_irq(link, i)) 984 device_printf(dev, 985 "Warning, IRQ %d is not listed as valid\n", 986 i); 987 return (i); 988 } 989 } 990 991 /* 992 * If we have a valid BIOS IRQ, use that. We trust what the BIOS 993 * says it routed over what _CRS says the link thinks is routed. 994 */ 995 if (PCI_INTERRUPT_VALID(link->l_bios_irq)) 996 return (link->l_bios_irq); 997 998 /* 999 * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, 1000 * then use that. 1001 */ 1002 if (PCI_INTERRUPT_VALID(link->l_initial_irq)) 1003 return (link->l_initial_irq); 1004 1005 /* 1006 * Ok, we have no useful hints, so we have to pick from the 1007 * possible IRQs. For ISA IRQs we only use interrupts that 1008 * have already been used by the BIOS. 1009 */ 1010 best_irq = PCI_INVALID_IRQ; 1011 best_weight = INT_MAX; 1012 for (i = 0; i < link->l_num_irqs; i++) { 1013 pos_irq = link->l_irqs[i]; 1014 if (pos_irq < NUM_ISA_INTERRUPTS && 1015 (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) 1016 continue; 1017 pos_weight = pci_link_interrupt_weights[pos_irq]; 1018 if (pos_weight < best_weight) { 1019 best_weight = pos_weight; 1020 best_irq = pos_irq; 1021 } 1022 } 1023 1024 /* 1025 * If this is an ISA IRQ, try using the SCI if it is also an ISA 1026 * interrupt as a fallback. 1027 */ 1028 if (link->l_isa_irq) { 1029 pos_irq = AcpiGbl_FADT.SciInterrupt; 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 if (PCI_INTERRUPT_VALID(best_irq)) { 1038 if (bootverbose) 1039 device_printf(dev, "Picked IRQ %u with weight %d\n", 1040 best_irq, best_weight); 1041 } else 1042 device_printf(dev, "Unable to choose an IRQ\n"); 1043 return (best_irq); 1044 } 1045 1046 int 1047 acpi_pci_link_route_interrupt(device_t dev, int index) 1048 { 1049 struct link *link; 1050 1051 if (acpi_disabled("pci_link")) 1052 return (PCI_INVALID_IRQ); 1053 1054 ACPI_SERIAL_BEGIN(pci_link); 1055 link = acpi_pci_link_lookup(dev, index); 1056 if (link == NULL) 1057 panic("%s: apparently invalid index %d", __func__, index); 1058 1059 /* 1060 * If this link device is already routed to an interrupt, just return 1061 * the interrupt it is routed to. 1062 */ 1063 if (link->l_routed) { 1064 KASSERT(PCI_INTERRUPT_VALID(link->l_irq), 1065 ("%s: link is routed but has an invalid IRQ", __func__)); 1066 ACPI_SERIAL_END(pci_link); 1067 return (link->l_irq); 1068 } 1069 1070 /* Choose an IRQ if we need one. */ 1071 if (!PCI_INTERRUPT_VALID(link->l_irq)) { 1072 link->l_irq = acpi_pci_link_choose_irq(dev, link); 1073 1074 /* 1075 * Try to route the interrupt we picked. If it fails, then 1076 * assume the interrupt is not routed. 1077 */ 1078 if (PCI_INTERRUPT_VALID(link->l_irq)) { 1079 acpi_pci_link_route_irqs(dev); 1080 if (!link->l_routed) 1081 link->l_irq = PCI_INVALID_IRQ; 1082 } 1083 } 1084 ACPI_SERIAL_END(pci_link); 1085 1086 return (link->l_irq); 1087 } 1088 1089 /* 1090 * This is gross, but we abuse the identify routine to perform one-time 1091 * SYSINIT() style initialization for the driver. 1092 */ 1093 static void 1094 acpi_pci_link_identify(driver_t *driver, device_t parent) 1095 { 1096 1097 /* 1098 * If the SCI is an ISA IRQ, add it to the bitmask of known good 1099 * ISA IRQs. 1100 * 1101 * XXX: If we are using the APIC, the SCI might have been 1102 * rerouted to an APIC pin in which case this is invalid. However, 1103 * if we are using the APIC, we also shouldn't be having any PCI 1104 * interrupts routed via ISA IRQs, so this is probably ok. 1105 */ 1106 if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS) 1107 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt); 1108 } 1109 1110 static device_method_t acpi_pci_link_methods[] = { 1111 /* Device interface */ 1112 DEVMETHOD(device_identify, acpi_pci_link_identify), 1113 DEVMETHOD(device_probe, acpi_pci_link_probe), 1114 DEVMETHOD(device_attach, acpi_pci_link_attach), 1115 DEVMETHOD(device_resume, acpi_pci_link_resume), 1116 1117 DEVMETHOD_END 1118 }; 1119 1120 static driver_t acpi_pci_link_driver = { 1121 "pci_link", 1122 acpi_pci_link_methods, 1123 sizeof(struct acpi_pci_link_softc), 1124 }; 1125 1126 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, 0, 0); 1127 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);
Cache object: 4f6f3608835dc3e53125138203e3b16c
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