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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/8.1/sys/dev/acpica/acpi_pci_link.c 193530 2009-06-05 18:44:36Z 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 struct link_res_request *req; 272 struct link *link; 273 UINT8 *irqs = NULL; 274 UINT32 *ext_irqs = NULL; 275 int i, is_ext_irq = 1; 276 277 ACPI_SERIAL_ASSERT(pci_link); 278 req = (struct link_res_request *)context; 279 switch (res->Type) { 280 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 281 switch (req->in_dpf) { 282 case DPF_OUTSIDE: 283 /* We've started the first DPF. */ 284 req->in_dpf = DPF_FIRST; 285 break; 286 case DPF_FIRST: 287 /* We've started the second DPF. */ 288 req->in_dpf = DPF_IGNORE; 289 break; 290 } 291 break; 292 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 293 /* We are finished with DPF parsing. */ 294 KASSERT(req->in_dpf != DPF_OUTSIDE, 295 ("%s: end dpf when not parsing a dpf", __func__)); 296 req->in_dpf = DPF_OUTSIDE; 297 break; 298 case ACPI_RESOURCE_TYPE_IRQ: 299 is_ext_irq = 0; 300 /* fall through */ 301 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 302 /* 303 * Don't parse resources if we are in a DPF set that we are 304 * ignoring. 305 */ 306 if (req->in_dpf == DPF_IGNORE) 307 break; 308 309 KASSERT(req->link_index < req->sc->pl_num_links, 310 ("%s: array boundary violation", __func__)); 311 link = &req->sc->pl_links[req->link_index]; 312 if (link->l_res_index == -1) { 313 KASSERT(req->sc->pl_crs_bad, 314 ("res_index should be set")); 315 link->l_res_index = req->res_index; 316 } 317 req->link_index++; 318 req->res_index++; 319 320 /* 321 * Stash a copy of the resource for later use when doing 322 * _SRS. 323 */ 324 bcopy(res, &link->l_prs_template, sizeof(ACPI_RESOURCE)); 325 if (is_ext_irq) { 326 link->l_num_irqs = 327 res->Data.ExtendedIrq.InterruptCount; 328 ext_irqs = res->Data.ExtendedIrq.Interrupts; 329 } else { 330 link->l_num_irqs = res->Data.Irq.InterruptCount; 331 irqs = res->Data.Irq.Interrupts; 332 } 333 if (link->l_num_irqs == 0) 334 break; 335 336 /* 337 * Save a list of the valid IRQs. Also, if all of the 338 * valid IRQs are ISA IRQs, then mark this link as 339 * routed via an ISA interrupt. 340 */ 341 link->l_isa_irq = TRUE; 342 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, 343 M_PCI_LINK, M_WAITOK | M_ZERO); 344 for (i = 0; i < link->l_num_irqs; i++) { 345 if (is_ext_irq) { 346 link->l_irqs[i] = ext_irqs[i]; 347 if (ext_irqs[i] >= NUM_ISA_INTERRUPTS) 348 link->l_isa_irq = FALSE; 349 } else { 350 link->l_irqs[i] = irqs[i]; 351 if (irqs[i] >= NUM_ISA_INTERRUPTS) 352 link->l_isa_irq = FALSE; 353 } 354 } 355 break; 356 default: 357 if (req->in_dpf == DPF_IGNORE) 358 break; 359 if (req->sc->pl_crs_bad) 360 device_printf(req->sc->pl_dev, 361 "Warning: possible resource %d will be lost during _SRS\n", 362 req->res_index); 363 req->res_index++; 364 } 365 return (AE_OK); 366 } 367 368 static int 369 link_valid_irq(struct link *link, int irq) 370 { 371 int i; 372 373 ACPI_SERIAL_ASSERT(pci_link); 374 375 /* Invalid interrupts are never valid. */ 376 if (!PCI_INTERRUPT_VALID(irq)) 377 return (FALSE); 378 379 /* Any interrupt in the list of possible interrupts is valid. */ 380 for (i = 0; i < link->l_num_irqs; i++) 381 if (link->l_irqs[i] == irq) 382 return (TRUE); 383 384 /* 385 * For links routed via an ISA interrupt, if the SCI is routed via 386 * an ISA interrupt, the SCI is always treated as a valid IRQ. 387 */ 388 if (link->l_isa_irq && AcpiGbl_FADT.SciInterrupt == irq && 389 irq < NUM_ISA_INTERRUPTS) 390 return (TRUE); 391 392 /* If the interrupt wasn't found in the list it is not valid. */ 393 return (FALSE); 394 } 395 396 static void 397 acpi_pci_link_dump(struct acpi_pci_link_softc *sc, int header, const char *tag) 398 { 399 struct link *link; 400 char buf[16]; 401 int i, j; 402 403 ACPI_SERIAL_ASSERT(pci_link); 404 if (header) { 405 snprintf(buf, sizeof(buf), "%s:", 406 device_get_nameunit(sc->pl_dev)); 407 printf("%-16.16s Index IRQ Rtd Ref IRQs\n", buf); 408 } 409 for (i = 0; i < sc->pl_num_links; i++) { 410 link = &sc->pl_links[i]; 411 printf(" %-14.14s %5d %3d %c %3d ", i == 0 ? tag : "", i, 412 link->l_irq, link->l_routed ? 'Y' : 'N', 413 link->l_references); 414 if (link->l_num_irqs == 0) 415 printf(" none"); 416 else for (j = 0; j < link->l_num_irqs; j++) 417 printf(" %d", link->l_irqs[j]); 418 printf("\n"); 419 } 420 } 421 422 static int 423 acpi_pci_link_attach(device_t dev) 424 { 425 struct acpi_pci_link_softc *sc; 426 struct link_count_request creq; 427 struct link_res_request rreq; 428 ACPI_STATUS status; 429 int i; 430 431 sc = device_get_softc(dev); 432 sc->pl_dev = dev; 433 ACPI_SERIAL_BEGIN(pci_link); 434 435 /* 436 * Count the number of current resources so we know how big of 437 * a link array to allocate. On some systems, _CRS is broken, 438 * so for those systems try to derive the count from _PRS instead. 439 */ 440 creq.in_dpf = DPF_OUTSIDE; 441 creq.count = 0; 442 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 443 acpi_count_irq_resources, &creq); 444 sc->pl_crs_bad = ACPI_FAILURE(status); 445 if (sc->pl_crs_bad) { 446 creq.in_dpf = DPF_OUTSIDE; 447 creq.count = 0; 448 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 449 acpi_count_irq_resources, &creq); 450 if (ACPI_FAILURE(status)) { 451 device_printf(dev, 452 "Unable to parse _CRS or _PRS: %s\n", 453 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 } 474 475 /* Try to read the current settings from _CRS if it is valid. */ 476 if (!sc->pl_crs_bad) { 477 rreq.in_dpf = DPF_OUTSIDE; 478 rreq.link_index = 0; 479 rreq.res_index = 0; 480 rreq.sc = sc; 481 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 482 link_add_crs, &rreq); 483 if (ACPI_FAILURE(status)) { 484 device_printf(dev, "Unable to parse _CRS: %s\n", 485 AcpiFormatException(status)); 486 goto fail; 487 } 488 } 489 490 /* 491 * Try to read the possible settings from _PRS. Note that if the 492 * _CRS is toast, we depend on having a working _PRS. However, if 493 * _CRS works, then it is ok for _PRS to be missing. 494 */ 495 rreq.in_dpf = DPF_OUTSIDE; 496 rreq.link_index = 0; 497 rreq.res_index = 0; 498 rreq.sc = sc; 499 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 500 link_add_prs, &rreq); 501 if (ACPI_FAILURE(status) && 502 (status != AE_NOT_FOUND || sc->pl_crs_bad)) { 503 device_printf(dev, "Unable to parse _PRS: %s\n", 504 AcpiFormatException(status)); 505 goto fail; 506 } 507 if (bootverbose) 508 acpi_pci_link_dump(sc, 1, "Initial Probe"); 509 510 /* Verify initial IRQs if we have _PRS. */ 511 if (status != AE_NOT_FOUND) 512 for (i = 0; i < sc->pl_num_links; i++) 513 if (!link_valid_irq(&sc->pl_links[i], 514 sc->pl_links[i].l_irq)) 515 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 516 if (bootverbose) 517 acpi_pci_link_dump(sc, 0, "Validation"); 518 519 /* Save initial IRQs. */ 520 for (i = 0; i < sc->pl_num_links; i++) 521 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; 522 523 /* 524 * Try to disable this link. If successful, set the current IRQ to 525 * zero and flags to indicate this link is not routed. If we can't 526 * run _DIS (i.e., the method doesn't exist), assume the initial 527 * IRQ was routed by the BIOS. 528 */ 529 if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, 530 NULL))) 531 for (i = 0; i < sc->pl_num_links; i++) 532 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 533 else 534 for (i = 0; i < sc->pl_num_links; i++) 535 if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) 536 sc->pl_links[i].l_routed = TRUE; 537 if (bootverbose) 538 acpi_pci_link_dump(sc, 0, "After Disable"); 539 ACPI_SERIAL_END(pci_link); 540 return (0); 541 fail: 542 ACPI_SERIAL_END(pci_link); 543 for (i = 0; i < sc->pl_num_links; i++) 544 if (sc->pl_links[i].l_irqs != NULL) 545 free(sc->pl_links[i].l_irqs, M_PCI_LINK); 546 free(sc->pl_links, M_PCI_LINK); 547 return (ENXIO); 548 } 549 550 /* XXX: Note that this is identical to pci_pir_search_irq(). */ 551 static uint8_t 552 acpi_pci_link_search_irq(int bus, int device, int pin) 553 { 554 uint32_t value; 555 uint8_t func, maxfunc; 556 557 /* See if we have a valid device at function 0. */ 558 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 559 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 560 return (PCI_INVALID_IRQ); 561 if (value & PCIM_MFDEV) 562 maxfunc = PCI_FUNCMAX; 563 else 564 maxfunc = 0; 565 566 /* Scan all possible functions at this device. */ 567 for (func = 0; func <= maxfunc; func++) { 568 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 569 if (value == 0xffffffff) 570 continue; 571 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 572 573 /* 574 * See if it uses the pin in question. Note that the passed 575 * in pin uses 0 for A, .. 3 for D whereas the intpin 576 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 577 */ 578 if (value != pin + 1) 579 continue; 580 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 581 if (bootverbose) 582 printf( 583 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n", 584 bus, device, pin + 'A', func, value); 585 if (value != PCI_INVALID_IRQ) 586 return (value); 587 } 588 return (PCI_INVALID_IRQ); 589 } 590 591 /* 592 * Find the link structure that corresponds to the resource index passed in 593 * via 'source_index'. 594 */ 595 static struct link * 596 acpi_pci_link_lookup(device_t dev, int source_index) 597 { 598 struct acpi_pci_link_softc *sc; 599 int i; 600 601 ACPI_SERIAL_ASSERT(pci_link); 602 sc = device_get_softc(dev); 603 for (i = 0; i < sc->pl_num_links; i++) 604 if (sc->pl_links[i].l_res_index == source_index) 605 return (&sc->pl_links[i]); 606 return (NULL); 607 } 608 609 void 610 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot, 611 int pin) 612 { 613 struct link *link; 614 uint8_t bios_irq; 615 uintptr_t bus; 616 617 /* 618 * Look up the PCI bus for the specified PCI bridge device. Note 619 * that the PCI bridge device might not have any children yet. 620 * However, looking up its bus number doesn't require a valid child 621 * device, so we just pass NULL. 622 */ 623 if (BUS_READ_IVAR(pcib, NULL, PCIB_IVAR_BUS, &bus) != 0) { 624 device_printf(pcib, "Unable to read PCI bus number"); 625 panic("PCI bridge without a bus number"); 626 } 627 628 /* Bump the reference count. */ 629 ACPI_SERIAL_BEGIN(pci_link); 630 link = acpi_pci_link_lookup(dev, index); 631 if (link == NULL) { 632 device_printf(dev, "apparently invalid index %d\n", index); 633 ACPI_SERIAL_END(pci_link); 634 return; 635 } 636 link->l_references++; 637 if (link->l_routed) 638 pci_link_interrupt_weights[link->l_irq]++; 639 640 /* 641 * The BIOS only routes interrupts via ISA IRQs using the ATPICs 642 * (8259As). Thus, if this link is routed via an ISA IRQ, go 643 * look to see if the BIOS routed an IRQ for this link at the 644 * indicated (bus, slot, pin). If so, we prefer that IRQ for 645 * this link and add that IRQ to our list of known-good IRQs. 646 * This provides a good work-around for link devices whose _CRS 647 * method is either broken or bogus. We only use the value 648 * returned by _CRS if we can't find a valid IRQ via this method 649 * in fact. 650 * 651 * If this link is not routed via an ISA IRQ (because we are using 652 * APIC for example), then don't bother looking up the BIOS IRQ 653 * as if we find one it won't be valid anyway. 654 */ 655 if (!link->l_isa_irq) { 656 ACPI_SERIAL_END(pci_link); 657 return; 658 } 659 660 /* Try to find a BIOS IRQ setting from any matching devices. */ 661 bios_irq = acpi_pci_link_search_irq(bus, slot, pin); 662 if (!PCI_INTERRUPT_VALID(bios_irq)) { 663 ACPI_SERIAL_END(pci_link); 664 return; 665 } 666 667 /* Validate the BIOS IRQ. */ 668 if (!link_valid_irq(link, bios_irq)) { 669 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n", 670 bios_irq, (int)bus, slot, pin + 'A'); 671 } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { 672 link->l_bios_irq = bios_irq; 673 if (bios_irq < NUM_ISA_INTERRUPTS) 674 pci_link_bios_isa_irqs |= (1 << bios_irq); 675 if (bios_irq != link->l_initial_irq && 676 PCI_INTERRUPT_VALID(link->l_initial_irq)) 677 device_printf(dev, 678 "BIOS IRQ %u does not match initial IRQ %u\n", 679 bios_irq, link->l_initial_irq); 680 } else if (bios_irq != link->l_bios_irq) 681 device_printf(dev, 682 "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n", 683 bios_irq, (int)bus, slot, pin + 'A', 684 link->l_bios_irq); 685 ACPI_SERIAL_END(pci_link); 686 } 687 688 static ACPI_STATUS 689 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 690 { 691 ACPI_RESOURCE *resource, *end, newres, *resptr; 692 ACPI_BUFFER crsbuf; 693 ACPI_STATUS status; 694 struct link *link; 695 int i, in_dpf; 696 697 /* Fetch the _CRS. */ 698 ACPI_SERIAL_ASSERT(pci_link); 699 crsbuf.Pointer = NULL; 700 crsbuf.Length = ACPI_ALLOCATE_BUFFER; 701 status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), &crsbuf); 702 if (ACPI_SUCCESS(status) && crsbuf.Pointer == NULL) 703 status = AE_NO_MEMORY; 704 if (ACPI_FAILURE(status)) { 705 if (bootverbose) 706 device_printf(sc->pl_dev, 707 "Unable to fetch current resources: %s\n", 708 AcpiFormatException(status)); 709 return (status); 710 } 711 712 /* Fill in IRQ resources via link structures. */ 713 srsbuf->Pointer = NULL; 714 link = sc->pl_links; 715 i = 0; 716 in_dpf = DPF_OUTSIDE; 717 resource = (ACPI_RESOURCE *)crsbuf.Pointer; 718 end = (ACPI_RESOURCE *)((char *)crsbuf.Pointer + crsbuf.Length); 719 for (;;) { 720 switch (resource->Type) { 721 case ACPI_RESOURCE_TYPE_START_DEPENDENT: 722 switch (in_dpf) { 723 case DPF_OUTSIDE: 724 /* We've started the first DPF. */ 725 in_dpf = DPF_FIRST; 726 break; 727 case DPF_FIRST: 728 /* We've started the second DPF. */ 729 panic( 730 "%s: Multiple dependent functions within a current resource", 731 __func__); 732 break; 733 } 734 resptr = NULL; 735 break; 736 case ACPI_RESOURCE_TYPE_END_DEPENDENT: 737 /* We are finished with DPF parsing. */ 738 KASSERT(in_dpf != DPF_OUTSIDE, 739 ("%s: end dpf when not parsing a dpf", __func__)); 740 in_dpf = DPF_OUTSIDE; 741 resptr = NULL; 742 break; 743 case ACPI_RESOURCE_TYPE_IRQ: 744 MPASS(i < sc->pl_num_links); 745 MPASS(link->l_prs_template.Type == ACPI_RESOURCE_TYPE_IRQ); 746 newres = link->l_prs_template; 747 resptr = &newres; 748 resptr->Data.Irq.InterruptCount = 1; 749 if (PCI_INTERRUPT_VALID(link->l_irq)) { 750 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 751 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 752 __func__, link->l_irq)); 753 resptr->Data.Irq.Interrupts[0] = link->l_irq; 754 } else 755 resptr->Data.Irq.Interrupts[0] = 0; 756 link++; 757 i++; 758 break; 759 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 760 MPASS(i < sc->pl_num_links); 761 MPASS(link->l_prs_template.Type == ACPI_RESOURCE_TYPE_EXTENDED_IRQ); 762 newres = link->l_prs_template; 763 resptr = &newres; 764 resptr->Data.ExtendedIrq.InterruptCount = 1; 765 if (PCI_INTERRUPT_VALID(link->l_irq)) 766 resptr->Data.ExtendedIrq.Interrupts[0] = 767 link->l_irq; 768 else 769 resptr->Data.ExtendedIrq.Interrupts[0] = 0; 770 link++; 771 i++; 772 break; 773 default: 774 resptr = resource; 775 } 776 if (resptr != NULL) { 777 status = acpi_AppendBufferResource(srsbuf, resptr); 778 if (ACPI_FAILURE(status)) { 779 device_printf(sc->pl_dev, 780 "Unable to build resources: %s\n", 781 AcpiFormatException(status)); 782 if (srsbuf->Pointer != NULL) 783 AcpiOsFree(srsbuf->Pointer); 784 AcpiOsFree(crsbuf.Pointer); 785 return (status); 786 } 787 } 788 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 789 break; 790 resource = ACPI_NEXT_RESOURCE(resource); 791 if (resource >= end) 792 break; 793 } 794 AcpiOsFree(crsbuf.Pointer); 795 return (AE_OK); 796 } 797 798 static ACPI_STATUS 799 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, 800 ACPI_BUFFER *srsbuf) 801 { 802 ACPI_RESOURCE newres; 803 ACPI_STATUS status; 804 struct link *link; 805 int i; 806 807 /* Start off with an empty buffer. */ 808 srsbuf->Pointer = NULL; 809 link = sc->pl_links; 810 for (i = 0; i < sc->pl_num_links; i++) { 811 812 /* Add a new IRQ resource from each link. */ 813 link = &sc->pl_links[i]; 814 newres = link->l_prs_template; 815 if (newres.Type == ACPI_RESOURCE_TYPE_IRQ) { 816 817 /* Build an IRQ resource. */ 818 newres.Data.Irq.InterruptCount = 1; 819 if (PCI_INTERRUPT_VALID(link->l_irq)) { 820 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 821 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 822 __func__, link->l_irq)); 823 newres.Data.Irq.Interrupts[0] = link->l_irq; 824 } else 825 newres.Data.Irq.Interrupts[0] = 0; 826 } else { 827 828 /* Build an ExtIRQ resuorce. */ 829 newres.Data.ExtendedIrq.InterruptCount = 1; 830 if (PCI_INTERRUPT_VALID(link->l_irq)) 831 newres.Data.ExtendedIrq.Interrupts[0] = 832 link->l_irq; 833 else 834 newres.Data.ExtendedIrq.Interrupts[0] = 0; 835 } 836 837 /* Add the new resource to the end of the _SRS buffer. */ 838 status = acpi_AppendBufferResource(srsbuf, &newres); 839 if (ACPI_FAILURE(status)) { 840 device_printf(sc->pl_dev, 841 "Unable to build resources: %s\n", 842 AcpiFormatException(status)); 843 if (srsbuf->Pointer != NULL) 844 AcpiOsFree(srsbuf->Pointer); 845 return (status); 846 } 847 } 848 return (AE_OK); 849 } 850 851 static ACPI_STATUS 852 acpi_pci_link_route_irqs(device_t dev) 853 { 854 struct acpi_pci_link_softc *sc; 855 ACPI_RESOURCE *resource, *end; 856 ACPI_BUFFER srsbuf; 857 ACPI_STATUS status; 858 struct link *link; 859 int i; 860 861 ACPI_SERIAL_ASSERT(pci_link); 862 sc = device_get_softc(dev); 863 if (sc->pl_crs_bad) 864 status = acpi_pci_link_srs_from_links(sc, &srsbuf); 865 else 866 status = acpi_pci_link_srs_from_crs(sc, &srsbuf); 867 868 /* Write out new resources via _SRS. */ 869 status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf); 870 if (ACPI_FAILURE(status)) { 871 device_printf(dev, "Unable to route IRQs: %s\n", 872 AcpiFormatException(status)); 873 AcpiOsFree(srsbuf.Pointer); 874 return (status); 875 } 876 877 /* 878 * Perform acpi_config_intr() on each IRQ resource if it was just 879 * routed for the first time. 880 */ 881 link = sc->pl_links; 882 i = 0; 883 resource = (ACPI_RESOURCE *)srsbuf.Pointer; 884 end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); 885 for (;;) { 886 if (resource->Type == ACPI_RESOURCE_TYPE_END_TAG) 887 break; 888 switch (resource->Type) { 889 case ACPI_RESOURCE_TYPE_IRQ: 890 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: 891 MPASS(i < sc->pl_num_links); 892 893 /* 894 * Only configure the interrupt and update the 895 * weights if this link has a valid IRQ and was 896 * previously unrouted. 897 */ 898 if (!link->l_routed && 899 PCI_INTERRUPT_VALID(link->l_irq)) { 900 link->l_routed = TRUE; 901 acpi_config_intr(dev, resource); 902 pci_link_interrupt_weights[link->l_irq] += 903 link->l_references; 904 } 905 link++; 906 i++; 907 break; 908 } 909 resource = ACPI_NEXT_RESOURCE(resource); 910 if (resource >= end) 911 break; 912 } 913 AcpiOsFree(srsbuf.Pointer); 914 return (AE_OK); 915 } 916 917 static int 918 acpi_pci_link_resume(device_t dev) 919 { 920 struct acpi_pci_link_softc *sc; 921 ACPI_STATUS status; 922 int i, routed; 923 924 /* 925 * If all of our links are routed, then restore the link via _SRS, 926 * otherwise, disable the link via _DIS. 927 */ 928 ACPI_SERIAL_BEGIN(pci_link); 929 sc = device_get_softc(dev); 930 routed = 0; 931 for (i = 0; i < sc->pl_num_links; i++) 932 if (sc->pl_links[i].l_routed) 933 routed++; 934 if (routed == sc->pl_num_links) 935 status = acpi_pci_link_route_irqs(dev); 936 else { 937 AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, NULL); 938 status = AE_OK; 939 } 940 ACPI_SERIAL_END(pci_link); 941 if (ACPI_FAILURE(status)) 942 return (ENXIO); 943 else 944 return (0); 945 } 946 947 /* 948 * Pick an IRQ to use for this unrouted link. 949 */ 950 static uint8_t 951 acpi_pci_link_choose_irq(device_t dev, struct link *link) 952 { 953 char tunable_buffer[64], link_name[5]; 954 u_int8_t best_irq, pos_irq; 955 int best_weight, pos_weight, i; 956 957 KASSERT(!link->l_routed, ("%s: link already routed", __func__)); 958 KASSERT(!PCI_INTERRUPT_VALID(link->l_irq), 959 ("%s: link already has an IRQ", __func__)); 960 961 /* Check for a tunable override. */ 962 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name, 963 sizeof(link_name)))) { 964 snprintf(tunable_buffer, sizeof(tunable_buffer), 965 "hw.pci.link.%s.%d.irq", link_name, link->l_res_index); 966 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 967 if (!link_valid_irq(link, i)) 968 device_printf(dev, 969 "Warning, IRQ %d is not listed as valid\n", 970 i); 971 return (i); 972 } 973 snprintf(tunable_buffer, sizeof(tunable_buffer), 974 "hw.pci.link.%s.irq", link_name); 975 if (getenv_int(tunable_buffer, &i) && PCI_INTERRUPT_VALID(i)) { 976 if (!link_valid_irq(link, i)) 977 device_printf(dev, 978 "Warning, IRQ %d is not listed as valid\n", 979 i); 980 return (i); 981 } 982 } 983 984 /* 985 * If we have a valid BIOS IRQ, use that. We trust what the BIOS 986 * says it routed over what _CRS says the link thinks is routed. 987 */ 988 if (PCI_INTERRUPT_VALID(link->l_bios_irq)) 989 return (link->l_bios_irq); 990 991 /* 992 * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, 993 * then use that. 994 */ 995 if (PCI_INTERRUPT_VALID(link->l_initial_irq)) 996 return (link->l_initial_irq); 997 998 /* 999 * Ok, we have no useful hints, so we have to pick from the 1000 * possible IRQs. For ISA IRQs we only use interrupts that 1001 * have already been used by the BIOS. 1002 */ 1003 best_irq = PCI_INVALID_IRQ; 1004 best_weight = INT_MAX; 1005 for (i = 0; i < link->l_num_irqs; i++) { 1006 pos_irq = link->l_irqs[i]; 1007 if (pos_irq < NUM_ISA_INTERRUPTS && 1008 (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) 1009 continue; 1010 pos_weight = pci_link_interrupt_weights[pos_irq]; 1011 if (pos_weight < best_weight) { 1012 best_weight = pos_weight; 1013 best_irq = pos_irq; 1014 } 1015 } 1016 1017 /* 1018 * If this is an ISA IRQ, try using the SCI if it is also an ISA 1019 * interrupt as a fallback. 1020 */ 1021 if (link->l_isa_irq) { 1022 pos_irq = AcpiGbl_FADT.SciInterrupt; 1023 pos_weight = pci_link_interrupt_weights[pos_irq]; 1024 if (pos_weight < best_weight) { 1025 best_weight = pos_weight; 1026 best_irq = pos_irq; 1027 } 1028 } 1029 1030 if (PCI_INTERRUPT_VALID(best_irq)) { 1031 if (bootverbose) 1032 device_printf(dev, "Picked IRQ %u with weight %d\n", 1033 best_irq, best_weight); 1034 } else 1035 device_printf(dev, "Unable to choose an IRQ\n"); 1036 return (best_irq); 1037 } 1038 1039 int 1040 acpi_pci_link_route_interrupt(device_t dev, int index) 1041 { 1042 struct link *link; 1043 1044 if (acpi_disabled("pci_link")) 1045 return (PCI_INVALID_IRQ); 1046 1047 ACPI_SERIAL_BEGIN(pci_link); 1048 link = acpi_pci_link_lookup(dev, index); 1049 if (link == NULL) 1050 panic("%s: apparently invalid index %d", __func__, index); 1051 1052 /* 1053 * If this link device is already routed to an interrupt, just return 1054 * the interrupt it is routed to. 1055 */ 1056 if (link->l_routed) { 1057 KASSERT(PCI_INTERRUPT_VALID(link->l_irq), 1058 ("%s: link is routed but has an invalid IRQ", __func__)); 1059 ACPI_SERIAL_END(pci_link); 1060 return (link->l_irq); 1061 } 1062 1063 /* Choose an IRQ if we need one. */ 1064 if (!PCI_INTERRUPT_VALID(link->l_irq)) { 1065 link->l_irq = acpi_pci_link_choose_irq(dev, link); 1066 1067 /* 1068 * Try to route the interrupt we picked. If it fails, then 1069 * assume the interrupt is not routed. 1070 */ 1071 if (PCI_INTERRUPT_VALID(link->l_irq)) { 1072 acpi_pci_link_route_irqs(dev); 1073 if (!link->l_routed) 1074 link->l_irq = PCI_INVALID_IRQ; 1075 } 1076 } 1077 ACPI_SERIAL_END(pci_link); 1078 1079 return (link->l_irq); 1080 } 1081 1082 /* 1083 * This is gross, but we abuse the identify routine to perform one-time 1084 * SYSINIT() style initialization for the driver. 1085 */ 1086 static void 1087 acpi_pci_link_identify(driver_t *driver, device_t parent) 1088 { 1089 1090 /* 1091 * If the SCI is an ISA IRQ, add it to the bitmask of known good 1092 * ISA IRQs. 1093 * 1094 * XXX: If we are using the APIC, the SCI might have been 1095 * rerouted to an APIC pin in which case this is invalid. However, 1096 * if we are using the APIC, we also shouldn't be having any PCI 1097 * interrupts routed via ISA IRQs, so this is probably ok. 1098 */ 1099 if (AcpiGbl_FADT.SciInterrupt < NUM_ISA_INTERRUPTS) 1100 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT.SciInterrupt); 1101 } 1102 1103 static device_method_t acpi_pci_link_methods[] = { 1104 /* Device interface */ 1105 DEVMETHOD(device_identify, acpi_pci_link_identify), 1106 DEVMETHOD(device_probe, acpi_pci_link_probe), 1107 DEVMETHOD(device_attach, acpi_pci_link_attach), 1108 DEVMETHOD(device_resume, acpi_pci_link_resume), 1109 1110 {0, 0} 1111 }; 1112 1113 static driver_t acpi_pci_link_driver = { 1114 "pci_link", 1115 acpi_pci_link_methods, 1116 sizeof(struct acpi_pci_link_softc), 1117 }; 1118 1119 static devclass_t pci_link_devclass; 1120 1121 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass, 0, 1122 0); 1123 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1);
Cache object: 325726ab468ca5b43a669b56869d21c1
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