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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: releng/9.1/sys/dev/acpica/acpi_pci_link.c 214849 2010-11-05 20:24:26Z jkim $"); 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 int l_res_index; 103 int l_num_irqs; 104 int *l_irqs; 105 int l_references; 106 int l_routed:1; 107 int l_isa_irq:1; 108 ACPI_RESOURCE l_prs_template; 109 }; 110 111 struct link_count_request { 112 int in_dpf; 113 int count; 114 }; 115 116 struct link_res_request { 117 struct acpi_pci_link_softc *sc; 118 int in_dpf; 119 int res_index; 120 int link_index; 121 }; 122 123 MALLOC_DEFINE(M_PCI_LINK, "pci_link", "ACPI PCI Link structures"); 124 125 static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS]; 126 static int pci_link_bios_isa_irqs; 127 128 static char *pci_link_ids[] = { "PNP0C0F", NULL }; 129 130 /* 131 * Fetch the short name associated with an ACPI handle and save it in the 132 * passed in buffer. 133 */ 134 static ACPI_STATUS 135 acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen) 136 { 137 ACPI_BUFFER buf; 138 139 buf.Length = buflen; 140 buf.Pointer = buffer; 141 return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf)); 142 } 143 144 static int 145 acpi_pci_link_probe(device_t dev) 146 { 147 char descr[28], name[12]; 148 149 /* 150 * We explicitly do not check _STA since not all systems set it to 151 * sensible values. 152 */ 153 if (acpi_disabled("pci_link") || 154 ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids) == NULL) 155 return (ENXIO); 156 157 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), name, 158 sizeof(name)))) { 159 snprintf(descr, sizeof(descr), "ACPI PCI Link %s", name); 160 device_set_desc_copy(dev, descr); 161 } else 162 device_set_desc(dev, "ACPI PCI Link"); 163 device_quiet(dev); 164 return (0); 165 } 166 167 static ACPI_STATUS 168 acpi_count_irq_resources(ACPI_RESOURCE *res, void *context) 169 { 170 struct link_count_request *req; 171 172 req = (struct link_count_request *)context; 173 switch (res->Type) { 174 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 175 switch (req->in_dpf) { 176 case DPF_OUTSIDE: 177 /* We've started the first DPF. */ 178 req->in_dpf = DPF_FIRST; 179 break; 180 case DPF_FIRST: 181 /* We've started the second DPF. */ 182 req->in_dpf = DPF_IGNORE; 183 break; 184 } 185 break; 186 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 187 /* We are finished with DPF parsing. */ 188 KASSERT(req->in_dpf != DPF_OUTSIDE, 189 ("%s: end dpf when not parsing a dpf", __func__)); 190 req->in_dpf = DPF_OUTSIDE; 191 break; 192 case ACPI_RESOURCE_TYPE_IRQ: 193 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 194 /* 195 * Don't count resources if we are in a DPF set that we are 196 * ignoring. 197 */ 198 if (req->in_dpf != DPF_IGNORE) 199 req->count++; 200 } 201 return (AE_OK); 202 } 203 204 static ACPI_STATUS 205 link_add_crs(ACPI_RESOURCE *res, void *context) 206 { 207 struct link_res_request *req; 208 struct link *link; 209 210 ACPI_SERIAL_ASSERT(pci_link); 211 req = (struct link_res_request *)context; 212 switch (res->Type) { 213 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 214 switch (req->in_dpf) { 215 case DPF_OUTSIDE: 216 /* We've started the first DPF. */ 217 req->in_dpf = DPF_FIRST; 218 break; 219 case DPF_FIRST: 220 /* We've started the second DPF. */ 221 panic( 222 "%s: Multiple dependent functions within a current resource", 223 __func__); 224 break; 225 } 226 break; 227 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 228 /* We are finished with DPF parsing. */ 229 KASSERT(req->in_dpf != DPF_OUTSIDE, 230 ("%s: end dpf when not parsing a dpf", __func__)); 231 req->in_dpf = DPF_OUTSIDE; 232 break; 233 case ACPI_RESOURCE_TYPE_IRQ: 234 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 235 KASSERT(req->link_index < req->sc->pl_num_links, 236 ("%s: array boundary violation", __func__)); 237 link = &req->sc->pl_links[req->link_index]; 238 link->l_res_index = req->res_index; 239 req->link_index++; 240 req->res_index++; 241 242 /* 243 * Only use the current value if there's one IRQ. Some 244 * systems return multiple IRQs (which is nonsense for _CRS) 245 * when the link hasn't been programmed. 246 */ 247 if (res->Type == ACPI_RESOURCE_TYPE_IRQ) { 248 if (res->Data.Irq.InterruptCount == 1) 249 link->l_irq = res->Data.Irq.Interrupts[0]; 250 } else if (res->Data.ExtendedIrq.InterruptCount == 1) 251 link->l_irq = res->Data.ExtendedIrq.Interrupts[0]; 252 253 /* 254 * An IRQ of zero means that the link isn't routed. 255 */ 256 if (link->l_irq == 0) 257 link->l_irq = PCI_INVALID_IRQ; 258 break; 259 default: 260 req->res_index++; 261 } 262 return (AE_OK); 263 } 264 265 /* 266 * Populate the set of possible IRQs for each device. 267 */ 268 static ACPI_STATUS 269 link_add_prs(ACPI_RESOURCE *res, void *context) 270 { 271 ACPI_RESOURCE *tmp; 272 struct link_res_request *req; 273 struct link *link; 274 UINT8 *irqs = NULL; 275 UINT32 *ext_irqs = NULL; 276 int i, is_ext_irq = 1; 277 278 ACPI_SERIAL_ASSERT(pci_link); 279 req = (struct link_res_request *)context; 280 switch (res->Type) { 281 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 282 switch (req->in_dpf) { 283 case DPF_OUTSIDE: 284 /* We've started the first DPF. */ 285 req->in_dpf = DPF_FIRST; 286 break; 287 case DPF_FIRST: 288 /* We've started the second DPF. */ 289 req->in_dpf = DPF_IGNORE; 290 break; 291 } 292 break; 293 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 294 /* We are finished with DPF parsing. */ 295 KASSERT(req->in_dpf != DPF_OUTSIDE, 296 ("%s: end dpf when not parsing a dpf", __func__)); 297 req->in_dpf = DPF_OUTSIDE; 298 break; 299 case ACPI_RESOURCE_TYPE_IRQ: 300 is_ext_irq = 0; 301 /* fall through */ 302 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 303 /* 304 * Don't parse resources if we are in a DPF set that we are 305 * ignoring. 306 */ 307 if (req->in_dpf == DPF_IGNORE) 308 break; 309 310 KASSERT(req->link_index < req->sc->pl_num_links, 311 ("%s: array boundary violation", __func__)); 312 link = &req->sc->pl_links[req->link_index]; 313 if (link->l_res_index == -1) { 314 KASSERT(req->sc->pl_crs_bad, 315 ("res_index should be set")); 316 link->l_res_index = req->res_index; 317 } 318 req->link_index++; 319 req->res_index++; 320 321 /* 322 * Stash a copy of the resource for later use when doing 323 * _SRS. 324 */ 325 tmp = &link->l_prs_template; 326 if (is_ext_irq) { 327 bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.ExtendedIrq)); 328 329 /* 330 * XXX acpi_AppendBufferResource() cannot handle 331 * optional data. 332 */ 333 bzero(&tmp->Data.ExtendedIrq.ResourceSource, 334 sizeof(tmp->Data.ExtendedIrq.ResourceSource)); 335 tmp->Length = ACPI_RS_SIZE(tmp->Data.ExtendedIrq); 336 337 link->l_num_irqs = 338 res->Data.ExtendedIrq.InterruptCount; 339 ext_irqs = res->Data.ExtendedIrq.Interrupts; 340 } else { 341 bcopy(res, tmp, ACPI_RS_SIZE(tmp->Data.Irq)); 342 link->l_num_irqs = res->Data.Irq.InterruptCount; 343 irqs = res->Data.Irq.Interrupts; 344 } 345 if (link->l_num_irqs == 0) 346 break; 347 348 /* 349 * Save a list of the valid IRQs. Also, if all of the 350 * valid IRQs are ISA IRQs, then mark this link as 351 * routed via an ISA interrupt. 352 */ 353 link->l_isa_irq = TRUE; 354 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, 355 M_PCI_LINK, M_WAITOK | M_ZERO); 356 for (i = 0; i < link->l_num_irqs; i++) { 357 if (is_ext_irq) { 358 link->l_irqs[i] = ext_irqs[i]; 359 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS) 360 link->l_isa_irq = FALSE; 361 } else { 362 link->l_irqs[i] = irqs[i]; 363 if (irqs[i] >= NUM_ISA_INTERRUPTS) 364 link->l_isa_irq = FALSE; 365 } 366 } 367 break; 368 default: 369 if (req->in_dpf == DPF_IGNORE) 370 break; 371 if (req->sc->pl_crs_bad) 372 device_printf(req->sc->pl_dev, 373 "Warning: possible resource %d will be lost during _SRS\n", 374 req->res_index); 375 req->res_index++; 376 } 377 return (AE_OK); 378 } 379 380 static int 381 link_valid_irq(struct link *link, int irq) 382 { 383 int i; 384 385 ACPI_SERIAL_ASSERT(pci_link); 386 387 /* Invalid interrupts are never valid. */ 388 if (!PCI_INTERRUPT_VALID(irq)) 389 return (FALSE); 390 391 /* Any interrupt in the list of possible interrupts is valid. */ 392 for (i = 0; i < link->l_num_irqs; i++) 393 if (link->l_irqs[i] == irq) 394 return (TRUE); 395 396 /* 397 * For links routed via an ISA interrupt, if the SCI is routed via 398 * an ISA interrupt, the SCI is always treated as a valid IRQ. 399 */ 400 if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq && 401 irq < NUM_ISA_INTERRUPTS) 402 return (TRUE); 403 404 /* If the interrupt wasn't found in the list it is not valid. */ 405 return (FALSE); 406 } 407 408 static void 409 acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag) 410 { 411 struct link *link; 412 char buf[16]; 413 int i, j; 414 415 ACPI_SERIAL_ASSERT(pci_link); 416 if (header) { 417 snprintf(buf, sizeof(buf), "%s:", 418 device_get_nameunit(sc->pl_dev)); 419 printf("%-16.16s Index IRQ Rtd Ref IRQs\n", buf); 420 } 421 for (i = 0; i < sc->pl_num_links; i++) { 422 link = &sc->pl_links[i]; 423 printf(" %-14.14s %5d %3d %c %3d ", i == 0 ? tag : "", i, 424 link->l_irq, link->l_routed ? 'Y' : 'N', 425 link->l_references); 426 if (link->l_num_irqs == 0) 427 printf(" none"); 428 else for (j = 0; j < link->l_num_irqs; j++) 429 printf(" %d", link->l_irqs[j]); 430 printf("\n"); 431 } 432 } 433 434 static int 435 acpi_pci_link_attach(device_t dev) 436 { 437 struct acpi_pci_link_softc *sc; 438 struct link_count_request creq; 439 struct link_res_request rreq; 440 ACPI_STATUS status; 441 int i; 442 443 sc = device_get_softc(dev); 444 sc->pl_dev = dev; 445 ACPI_SERIAL_BEGIN(pci_link); 446 447 /* 448 * Count the number of current resources so we know how big of 449 * a link array to allocate. On some systems, _CRS is broken, 450 * so for those systems try to derive the count from _PRS instead. 451 */ 452 creq.in_dpf = DPF_OUTSIDE; 453 creq.count = 0; 454 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 455 acpi_count_irq_resources, &creq); 456 sc->pl_crs_bad = ACPI_FAILURE(status); 457 if (sc->pl_crs_bad) { 458 creq.in_dpf = DPF_OUTSIDE; 459 creq.count = 0; 460 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 461 acpi_count_irq_resources, &creq); 462 if (ACPI_FAILURE(status)) { 463 device_printf(dev, 464 "Unable to parse _CRS or _PRS: %s\n", 465 AcpiFormatException(status)); 466 ACPI_SERIAL_END(pci_link); 467 return (ENXIO); 468 } 469 } 470 sc->pl_num_links = creq.count; 471 if (creq.count == 0) { 472 ACPI_SERIAL_END(pci_link); 473 return (0); 474 } 475 sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links, 476 M_PCI_LINK, M_WAITOK | M_ZERO); 477 478 /* Initialize the child links. */ 479 for (i = 0; i < sc->pl_num_links; i++) { 480 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 481 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ; 482 sc->pl_links[i].l_sc = sc; 483 sc->pl_links[i].l_isa_irq = FALSE; 484 sc->pl_links[i].l_res_index = -1; 485 } 486 487 /* Try to read the current settings from _CRS if it is valid. */ 488 if (!sc->pl_crs_bad) { 489 rreq.in_dpf = DPF_OUTSIDE; 490 rreq.link_index = 0; 491 rreq.res_index = 0; 492 rreq.sc = sc; 493 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 494 link_add_crs, &rreq); 495 if (ACPI_FAILURE(status)) { 496 device_printf(dev, "Unable to parse _CRS: %s\n", 497 AcpiFormatException(status)); 498 goto fail; 499 } 500 } 501 502 /* 503 * Try to read the possible settings from _PRS. Note that if the 504 * _CRS is toast, we depend on having a working _PRS. However, if 505 * _CRS works, then it is ok for _PRS to be missing. 506 */ 507 rreq.in_dpf = DPF_OUTSIDE; 508 rreq.link_index = 0; 509 rreq.res_index = 0; 510 rreq.sc = sc; 511 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 512 link_add_prs, &rreq); 513 if (ACPI_FAILURE(status) && 514 (status != AE_NOT_FOUND || sc->pl_crs_bad)) { 515 device_printf(dev, "Unable to parse _PRS: %s\n", 516 AcpiFormatException(status)); 517 goto fail; 518 } 519 if (bootverbose) 520 acpi_pci_link_dump(sc, 1, "Initial Probe"); 521 522 /* Verify initial IRQs if we have _PRS. */ 523 if (status != AE_NOT_FOUND) 524 for (i = 0; i < sc->pl_num_links; i++) 525 if (!link_valid_irq(&sc->pl_links[i], 526 sc->pl_links[i].l_irq)) 527 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 528 if (bootverbose) 529 acpi_pci_link_dump(sc, 0, "Validation"); 530 531 /* Save initial IRQs. */ 532 for (i = 0; i < sc->pl_num_links; i++) 533 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; 534 535 /* 536 * Try to disable this link. If successful, set the current IRQ to 537 * zero and flags to indicate this link is not routed. If we can't 538 * run _DIS (i.e., the method doesn't exist), assume the initial 539 * IRQ was routed by the BIOS. 540 */ 541 if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, 542 NULL))) 543 for (i = 0; i < sc->pl_num_links; i++) 544 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 545 else 546 for (i = 0; i < sc->pl_num_links; i++) 547 if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) 548 sc->pl_links[i].l_routed = TRUE; 549 if (bootverbose) 550 acpi_pci_link_dump(sc, 0, "After Disable"); 551 ACPI_SERIAL_END(pci_link); 552 return (0); 553 fail: 554 ACPI_SERIAL_END(pci_link); 555 for (i = 0; i < sc->pl_num_links; i++) 556 if (sc->pl_links[i].l_irqs != NULL) 557 free(sc->pl_links[i].l_irqs, M_PCI_LINK); 558 free(sc->pl_links, M_PCI_LINK); 559 return (ENXIO); 560 } 561 562 /* XXX: Note that this is identical to pci_pir_search_irq(). */ 563 static uint8_t 564 acpi_pci_link_search_irq(int bus, int device, int pin) 565 { 566 uint32_t value; 567 uint8_t func, maxfunc; 568 569 /* See if we have a valid device at function 0. */ 570 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 571 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 572 return (PCI_INVALID_IRQ); 573 if (value & PCIM_MFDEV) 574 maxfunc = PCI_FUNCMAX; 575 else 576 maxfunc = 0; 577 578 /* Scan all possible functions at this device. */ 579 for (func = 0; func <= maxfunc; func++) { 580 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 581 if (value == 0xffffffff) 582 continue; 583 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 584 585 /* 586 * See if it uses the pin in question. Note that the passed 587 * in pin uses 0 for A, .. 3 for D whereas the intpin 588 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 589 */ 590 if (value != pin + 1) 591 continue; 592 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 593 if (bootverbose) 594 printf( 595 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n", 596 bus, device, pin + 'A', func, value); 597 if (value != PCI_INVALID_IRQ) 598 return (value); 599 } 600 return (PCI_INVALID_IRQ); 601 } 602 603 /* 604 * Find the link structure that corresponds to the resource index passed in 605 * via 'source_index'. 606 */ 607 static struct link * 608 acpi_pci_link_lookup(device_t dev, int source_index) 609 { 610 struct acpi_pci_link_softc *sc; 611 int i; 612 613 ACPI_SERIAL_ASSERT(pci_link); 614 sc = device_get_softc(dev); 615 for (i = 0; i < sc->pl_num_links; i++) 616 if (sc->pl_links[i].l_res_index == source_index) 617 return (&sc->pl_links[i]); 618 return (NULL); 619 } 620 621 void 622 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot, 623 int pin) 624 { 625 struct link *link; 626 uint8_t bios_irq; 627 uintptr_t bus; 628 629 /* 630 * Look up the PCI bus for the specified PCI bridge device. Note 631 * that the PCI bridge device might not have any children yet. 632 * However, looking up its bus number doesn't require a valid child 633 * device, so we just pass NULL. 634 */ 635 if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) { 636 device_printf(pcib, "Unable to read PCI bus number"); 637 panic("PCI bridge without a bus number"); 638 } 639 640 /* Bump the reference count. */ 641 ACPI_SERIAL_BEGIN(pci_link); 642 link = acpi_pci_link_lookup(dev, index); 643 if (link == NULL) { 644 device_printf(dev, "apparently invalid index %d\n", index); 645 ACPI_SERIAL_END(pci_link); 646 return; 647 } 648 link->l_references++; 649 if (link->l_routed) 650 pci_link_interrupt_weights[link->l_irq]++; 651 652 /* 653 * The BIOS only routes interrupts via ISA IRQs using the ATPICs 654 * (8259As). Thus, if this link is routed via an ISA IRQ, go 655 * look to see if the BIOS routed an IRQ for this link at the 656 * indicated (bus, slot, pin). If so, we prefer that IRQ for 657 * this link and add that IRQ to our list of known-good IRQs. 658 * This provides a good work-around for link devices whose _CRS 659 * method is either broken or bogus. We only use the value 660 * returned by _CRS if we can't find a valid IRQ via this method 661 * in fact. 662 * 663 * If this link is not routed via an ISA IRQ (because we are using 664 * APIC for example), then don't bother looking up the BIOS IRQ 665 * as if we find one it won't be valid anyway. 666 */ 667 if (!link->l_isa_irq) { 668 ACPI_SERIAL_END(pci_link); 669 return; 670 } 671 672 /* Try to find a BIOS IRQ setting from any matching devices. */ 673 bios_irq = acpi_pci_link_search_irq(bus, slot, pin); 674 if (!PCI_INTERRUPT_VALID(bios_irq)) { 675 ACPI_SERIAL_END(pci_link); 676 return; 677 } 678 679 /* Validate the BIOS IRQ. */ 680 if (!link_valid_irq(link, bios_irq)) { 681 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n", 682 bios_irq, (int)bus, slot, pin + 'A'); 683 } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { 684 link->l_bios_irq = bios_irq; 685 if (bios_irq < NUM_ISA_INTERRUPTS) 686 pci_link_bios_isa_irqs |= (1 << bios_irq); 687 if (bios_irq != link->l_initial_irq && 688 PCI_INTERRUPT_VALID(link->l_initial_irq)) 689 device_printf(dev, 690 "BIOS IRQ %u does not match initial IRQ %u\n", 691 bios_irq, link->l_initial_irq); 692 } else if (bios_irq != link->l_bios_irq) 693 device_printf(dev, 694 "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n", 695 bios_irq, (int)bus, slot, pin + 'A', 696 link->l_bios_irq); 697 ACPI_SERIAL_END(pci_link); 698 } 699 700 static ACPI_STATUS 701 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 702 { 703 ACPI_RESOURCE *end, *res; 704 ACPI_STATUS status; 705 struct link *link; 706 int i, in_dpf; 707 708 /* Fetch the _CRS. */ 709 ACPI_SERIAL_ASSERT(pci_link); 710 srsbuf->Pointer = NULL; 711 srsbuf->Length = ACPI_ALLOCATE_BUFFER; 712 status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), srsbuf); 713 if (ACPI_SUCCESS(status) && srsbuf->Pointer == NULL) 714 status = AE_NO_MEMORY; 715 if (ACPI_FAILURE(status)) { 716 if (bootverbose) 717 device_printf(sc->pl_dev, 718 "Unable to fetch current resources: %s\n", 719 AcpiFormatException(status)); 720 return (status); 721 } 722 723 /* Fill in IRQ resources via link structures. */ 724 link = sc->pl_links; 725 i = 0; 726 in_dpf = DPF_OUTSIDE; 727 res = (ACPI_RESOURCE *)srsbuf->Pointer; 728 end = (ACPI_RESOURCE *)((char *)srsbuf->Pointer + srsbuf->Length); 729 for (;;) { 730 switch (res->Type) { 731 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 732 switch (in_dpf) { 733 case DPF_OUTSIDE: 734 /* We've started the first DPF. */ 735 in_dpf = DPF_FIRST; 736 break; 737 case DPF_FIRST: 738 /* We've started the second DPF. */ 739 panic( 740 "%s: Multiple dependent functions within a current resource", 741 __func__); 742 break; 743 } 744 break; 745 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 746 /* We are finished with DPF parsing. */ 747 KASSERT(in_dpf != DPF_OUTSIDE, 748 ("%s: end dpf when not parsing a dpf", __func__)); 749 in_dpf = DPF_OUTSIDE; 750 break; 751 case ACPI_RESOURCE_TYPE_IRQ: 752 MPASS(i < sc->pl_num_links); 753 res->Data.Irq.InterruptCount = 1; 754 if (PCI_INTERRUPT_VALID(link->l_irq)) { 755 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 756 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 757 __func__, link->l_irq)); 758 res->Data.Irq.Interrupts[0] = link->l_irq; 759 } else 760 res->Data.Irq.Interrupts[0] = 0; 761 link++; 762 i++; 763 break; 764 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 765 MPASS(i < sc->pl_num_links); 766 res->Data.ExtendedIrq.InterruptCount = 1; 767 if (PCI_INTERRUPT_VALID(link->l_irq)) 768 res->Data.ExtendedIrq.Interrupts[0] = 769 link->l_irq; 770 else 771 res->Data.ExtendedIrq.Interrupts[0] = 0; 772 link++; 773 i++; 774 break; 775 } 776 if (res->Type == ACPI_RESOURCE_TYPE_END_TAG) 777 break; 778 res = ACPI_NEXT_RESOURCE(res); 779 if (res >= end) 780 break; 781 } 782 return (AE_OK); 783 } 784 785 static ACPI_STATUS 786 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, 787 ACPI_BUFFER *srsbuf) 788 { 789 ACPI_RESOURCE newres; 790 ACPI_STATUS status; 791 struct link *link; 792 int i; 793 794 /* Start off with an empty buffer. */ 795 srsbuf->Pointer = NULL; 796 link = sc->pl_links; 797 for (i = 0; i < sc->pl_num_links; i++) { 798 799 /* Add a new IRQ resource from each link. */ 800 link = &sc->pl_links[i]; 801 if (link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ) { 802 803 /* Build an IRQ resource. */ 804 bcopy(&link->l_prs_template, &newres, 805 ACPI_RS_SIZE(newres.Data.Irq)); 806 newres.Data.Irq.InterruptCount = 1; 807 if (PCI_INTERRUPT_VALID(link->l_irq)) { 808 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 809 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 810 __func__, link->l_irq)); 811 newres.Data.Irq.Interrupts[0] = link->l_irq; 812 } else 813 newres.Data.Irq.Interrupts[0] = 0; 814 } else { 815 816 /* Build an ExtIRQ resuorce. */ 817 bcopy(&link->l_prs_template, &newres, 818 ACPI_RS_SIZE(newres.Data.ExtendedIrq)); 819 newres.Data.ExtendedIrq.InterruptCount = 1; 820 if (PCI_INTERRUPT_VALID(link->l_irq)) 821 newres.Data.ExtendedIrq.Interrupts[0] = 822 link->l_irq; 823 else 824 newres.Data.ExtendedIrq.Interrupts[0] = 0; 825 } 826 827 /* Add the new resource to the end of the _SRS buffer. */ 828 status = acpi_AppendBufferResource(srsbuf, &newres); 829 if (ACPI_FAILURE(status)) { 830 device_printf(sc->pl_dev, 831 "Unable to build resources: %s\n", 832 AcpiFormatException(status)); 833 if (srsbuf->Pointer != NULL) 834 AcpiOsFree(srsbuf->Pointer); 835 return (status); 836 } 837 } 838 return (AE_OK); 839 } 840 841 static ACPI_STATUS 842 acpi_pci_link_route_irqs(device_t dev) 843 { 844 struct acpi_pci_link_softc *sc; 845 ACPI_RESOURCE *resource, *end; 846 ACPI_BUFFER srsbuf; 847 ACPI_STATUS status; 848 struct link *link; 849 int i; 850 851 ACPI_SERIAL_ASSERT(pci_link); 852 sc = device_get_softc(dev); 853 if (sc->pl_crs_bad) 854 status = acpi_pci_link_srs_from_links(sc, &srsbuf); 855 else 856 status = acpi_pci_link_srs_from_crs(sc, &srsbuf); 857 858 /* Write out new resources via _SRS. */ 859 status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf); 860 if (ACPI_FAILURE(status)) { 861 device_printf(dev, "Unable to route IRQs: %s\n", 862 AcpiFormatException(status)); 863 AcpiOsFree(srsbuf.Pointer); 864 return (status); 865 } 866 867 /* 868 * Perform acpi_config_intr() on each IRQ resource if it was just 869 * routed for the first time. 870 */ 871 link = sc->pl_links; 872 i = 0; 873 resource = (ACPI_RESOURCE *)srsbuf.Pointer; 874 end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); 875 for (;;) { 876 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 877 break; 878 switch (resource->Type) { 879 case ACPI_RESOURCE_TYPE_IRQ: 880 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 881 MPASS(i < sc->pl_num_links); 882 883 /* 884 * Only configure the interrupt and update the 885 * weights if this link has a valid IRQ and was 886 * previously unrouted. 887 */ 888 if (!link->l_routed && 889 PCI_INTERRUPT_VALID(link->l_irq)) { 890 link->l_routed = TRUE; 891 acpi_config_intr(dev, resource); 892 pci_link_interrupt_weights[link->l_irq] += 893 link->l_references; 894 } 895 link++; 896 i++; 897 break; 898 } 899 resource = ACPI_NEXT_RESOURCE(resource); 900 if (resource >= end) 901 break; 902 } 903 AcpiOsFree(srsbuf.Pointer); 904 return (AE_OK); 905 } 906 907 static int 908 acpi_pci_link_resume(device_t dev) 909 { 910 struct acpi_pci_link_softc *sc; 911 ACPI_STATUS status; 912 int i, routed; 913 914 /* 915 * If all of our links are routed, then restore the link via _SRS, 916 * otherwise, disable the link via _DIS. 917 */ 918 ACPI_SERIAL_BEGIN(pci_link); 919 sc = device_get_softc(dev); 920 routed = 0; 921 for (i = 0; i < sc->pl_num_links; i++) 922 if (sc->pl_links[i].l_routed) 923 routed++; 924 if (routed == sc->pl_num_links) 925 status = acpi_pci_link_route_irqs(dev); 926 else { 927 AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL); 928 status = AE_OK; 929 } 930 ACPI_SERIAL_END(pci_link); 931 if (ACPI_FAILURE(status)) 932 return (ENXIO); 933 else 934 return (0); 935 } 936 937 /* 938 * Pick an IRQ to use for this unrouted link. 939 */ 940 static uint8_t 941 acpi_pci_link_choose_irq(device_t dev, struct link *link) 942 { 943 char tunable_buffer[64], link_name[5]; 944 u_int8_t best_irq, pos_irq; 945 int best_weight, pos_weight, i; 946 947 KASSERT(!link->l_routed, ("%s: link already routed", __func__)); 948 KASSERT(!PCI_INTERRUPT_VALID(link->l_irq), 949 ("%s: link already has an IRQ", __func__)); 950 951 /* Check for a tunable override. */ 952 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name, 953 sizeof(link_name)))) { 954 snprintf(tunable_buffer, sizeof(tunable_buffer), 955 "hw.pci.link.%s.%d.irq", link_name, link->l_res_index); 956 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 957 if (!link_valid_irq(link, i)) 958 device_printf(dev, 959 "Warning, IRQ %d is not listed as valid\n", 960 i); 961 return (i); 962 } 963 snprintf(tunable_buffer, sizeof(tunable_buffer), 964 "hw.pci.link.%s.irq", link_name); 965 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 966 if (!link_valid_irq(link, i)) 967 device_printf(dev, 968 "Warning, IRQ %d is not listed as valid\n", 969 i); 970 return (i); 971 } 972 } 973 974 /* 975 * If we have a valid BIOS IRQ, use that. We trust what the BIOS 976 * says it routed over what _CRS says the link thinks is routed. 977 */ 978 if (PCI_INTERRUPT_VALID(link->l_bios_irq)) 979 return (link->l_bios_irq); 980 981 /* 982 * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, 983 * then use that. 984 */ 985 if (PCI_INTERRUPT_VALID(link->l_initial_irq)) 986 return (link->l_initial_irq); 987 988 /* 989 * Ok, we have no useful hints, so we have to pick from the 990 * possible IRQs. For ISA IRQs we only use interrupts that 991 * have already been used by the BIOS. 992 */ 993 best_irq = PCI_INVALID_IRQ; 994 best_weight = INT_MAX; 995 for (i = 0; i < link->l_num_irqs; i++) { 996 pos_irq = link->l_irqs[i]; 997 if (pos_irq < NUM_ISA_INTERRUPTS && 998 (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) 999 continue; 1000 pos_weight = pci_link_interrupt_weights[pos_irq]; 1001 if (pos_weight < best_weight) { 1002 best_weight = pos_weight; 1003 best_irq = pos_irq; 1004 } 1005 } 1006 1007 /* 1008 * If this is an ISA IRQ, try using the SCI if it is also an ISA 1009 * interrupt as a fallback. 1010 */ 1011 if (link->l_isa_irq) { 1012 pos_irq = AcpiGbl_FADT.SciInterrupt; 1013 pos_weight = pci_link_interrupt_weights[pos_irq]; 1014 if (pos_weight < best_weight) { 1015 best_weight = pos_weight; 1016 best_irq = pos_irq; 1017 } 1018 } 1019 1020 if (PCI_INTERRUPT_VALID(best_irq)) { 1021 if (bootverbose) 1022 device_printf(dev, "Picked IRQ %u with weight %d\n", 1023 best_irq, best_weight); 1024 } else 1025 device_printf(dev, "Unable to choose an IRQ\n"); 1026 return (best_irq); 1027 } 1028 1029 int 1030 acpi_pci_link_route_interrupt(device_t dev, int index) 1031 { 1032 struct link *link; 1033 1034 if (acpi_disabled("pci_link")) 1035 return (PCI_INVALID_IRQ); 1036 1037 ACPI_SERIAL_BEGIN(pci_link); 1038 link = acpi_pci_link_lookup(dev, index); 1039 if (link == NULL) 1040 panic("%s: apparently invalid index %d", __func__, index); 1041 1042 /* 1043 * If this link device is already routed to an interrupt, just return 1044 * the interrupt it is routed to. 1045 */ 1046 if (link->l_routed) { 1047 KASSERT(PCI_INTERRUPT_VALID(link->l_irq), 1048 ("%s: link is routed but has an invalid IRQ", __func__)); 1049 ACPI_SERIAL_END(pci_link); 1050 return (link->l_irq); 1051 } 1052 1053 /* Choose an IRQ if we need one. */ 1054 if (!PCI_INTERRUPT_VALID(link->l_irq)) { 1055 link->l_irq = acpi_pci_link_choose_irq(dev, link); 1056 1057 /* 1058 * Try to route the interrupt we picked. If it fails, then 1059 * assume the interrupt is not routed. 1060 */ 1061 if (PCI_INTERRUPT_VALID(link->l_irq)) { 1062 acpi_pci_link_route_irqs(dev); 1063 if (!link->l_routed) 1064 link->l_irq = PCI_INVALID_IRQ; 1065 } 1066 } 1067 ACPI_SERIAL_END(pci_link); 1068 1069 return (link->l_irq); 1070 } 1071 1072 /* 1073 * This is gross, but we abuse the identify routine to perform one-time 1074 * SYSINIT() style initialization for the driver. 1075 */ 1076 static void 1077 acpi_pci_link_identify(driver_t *driver, device_t parent) 1078 { 1079 1080 /* 1081 * If the SCI is an ISA IRQ, add it to the bitmask of known good 1082 * ISA IRQs. 1083 * 1084 * XXX: If we are using the APIC, the SCI might have been 1085 * rerouted to an APIC pin in which case this is invalid. However, 1086 * if we are using the APIC, we also shouldn't be having any PCI 1087 * interrupts routed via ISA IRQs, so this is probably ok. 1088 */ 1089 if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS) 1090 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt); 1091 } 1092 1093 static device_method_t acpi_pci_link_methods[] = { 1094 /* Device interface */ 1095 DEVMETHOD(device_identify, acpi_pci_link_identify), 1096 DEVMETHOD(device_probe, acpi_pci_link_probe), 1097 DEVMETHOD(device_attach, acpi_pci_link_attach), 1098 DEVMETHOD(device_resume, acpi_pci_link_resume), 1099 1100 {0, 0} 1101 }; 1102 1103 static driver_t acpi_pci_link_driver = { 1104 "pci_link", 1105 acpi_pci_link_methods, 1106 sizeof(struct acpi_pci_link_softc), 1107 }; 1108 1109 static devclass_t pci_link_devclass; 1110 1111 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass, 0, 1112 0); 1113 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);
Cache object: cba57688e0efcf6fc94579b987956de2
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