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 "acpi.h" 39 #include <dev/acpica/acpivar.h> 40 #include <dev/acpica/acpi_pcibvar.h> 41 42 #include <machine/pci_cfgreg.h> 43 #include <dev/pci/pcireg.h> 44 #include <dev/pci/pcivar.h> 45 #include "pcib_if.h" 46 47 /* Hooks for the ACPI CA debugging infrastructure. */ 48 #define _COMPONENT ACPI_BUS 49 ACPI_MODULE_NAME("PCI_LINK") 50 51 ACPI_SERIAL_DECL(pci_link, "ACPI PCI link"); 52 53 #define NUM_ISA_INTERRUPTS 16 54 #define NUM_ACPI_INTERRUPTS 256 55 56 /* 57 * An ACPI PCI link device may contain multiple links. Each link has its 58 * own ACPI resource. _PRT entries specify which link is being used via 59 * the Source Index. 60 * 61 * XXX: A note about Source Indices and DPFs: Currently we assume that 62 * the DPF start and end tags are not counted towards the index that 63 * Source Index corresponds to. Also, we assume that when DPFs are in use 64 * they various sets overlap in terms of Indices. Here's an example 65 * resource list indicating these assumptions: 66 * 67 * Resource Index 68 * -------- ----- 69 * I/O Port 0 70 * Start DPF - 71 * IRQ 1 72 * MemIO 2 73 * Start DPF - 74 * IRQ 1 75 * MemIO 2 76 * End DPF - 77 * DMA Channel 3 78 * 79 * The XXX is because I'm not sure if this is a valid assumption to make. 80 */ 81 82 /* States during DPF processing. */ 83 #define DPF_OUTSIDE 0 84 #define DPF_FIRST 1 85 #define DPF_IGNORE 2 86 87 struct link; 88 89 struct acpi_pci_link_softc { 90 int pl_num_links; 91 int pl_crs_bad; 92 struct link *pl_links; 93 device_t pl_dev; 94 }; 95 96 struct link { 97 struct acpi_pci_link_softc *l_sc; 98 uint8_t l_bios_irq; 99 uint8_t l_irq; 100 uint8_t l_initial_irq; 101 int l_res_index; 102 int l_num_irqs; 103 int *l_irqs; 104 int l_references; 105 int l_routed:1; 106 int l_isa_irq:1; 107 ACPI_RESOURCE l_prs_template; 108 }; 109 110 struct link_count_request { 111 int in_dpf; 112 int count; 113 }; 114 115 struct link_res_request { 116 struct acpi_pci_link_softc *sc; 117 int in_dpf; 118 int res_index; 119 int link_index; 120 }; 121 122 MALLOC_DEFINE(M_PCI_LINK, "PCI Link", "ACPI PCI Link structures"); 123 124 static int pci_link_interrupt_weights[NUM_ACPI_INTERRUPTS]; 125 static int pci_link_bios_isa_irqs; 126 127 static char *pci_link_ids[] = { "PNP0C0F", NULL }; 128 129 /* 130 * Fetch the short name associated with an ACPI handle and save it in the 131 * passed in buffer. 132 */ 133 static ACPI_STATUS 134 acpi_short_name(ACPI_HANDLE handle, char *buffer, size_t buflen) 135 { 136 ACPI_BUFFER buf; 137 138 buf.Length = buflen; 139 buf.Pointer = buffer; 140 return (AcpiGetName(handle, ACPI_SINGLE_NAME, &buf)); 141 } 142 143 static int 144 acpi_pci_link_probe(device_t dev) 145 { 146 char descr[28], name[12]; 147 148 /* 149 * We explicitly do not check _STA since not all systems set it to 150 * sensible values. 151 */ 152 if (acpi_disabled("pci_link") || 153 ACPI_ID_PROBE(device_get_parent(dev), dev, pci_link_ids) == NULL) 154 return (ENXIO); 155 156 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), name, 157 sizeof(name)))) { 158 snprintf(descr, sizeof(descr), "ACPI PCI Link %s", name); 159 device_set_desc_copy(dev, descr); 160 } else 161 device_set_desc(dev, "ACPI PCI Link"); 162 return (0); 163 } 164 165 static ACPI_STATUS 166 acpi_count_irq_resources(ACPI_RESOURCE *res, void *context) 167 { 168 struct link_count_request *req; 169 170 req = (struct link_count_request *)context; 171 switch (res->Id) { 172 case ACPI_RSTYPE_START_DPF: 173 switch (req->in_dpf) { 174 case DPF_OUTSIDE: 175 /* We've started the first DPF. */ 176 req->in_dpf = DPF_FIRST; 177 break; 178 case DPF_FIRST: 179 /* We've started the second DPF. */ 180 req->in_dpf = DPF_IGNORE; 181 break; 182 } 183 break; 184 case ACPI_RSTYPE_END_DPF: 185 /* We are finished with DPF parsing. */ 186 KASSERT(req->in_dpf != DPF_OUTSIDE, 187 ("%s: end dpf when not parsing a dpf", __func__)); 188 req->in_dpf = DPF_OUTSIDE; 189 break; 190 case ACPI_RSTYPE_IRQ: 191 case ACPI_RSTYPE_EXT_IRQ: 192 /* 193 * Don't count resources if we are in a DPF set that we are 194 * ignoring. 195 */ 196 if (req->in_dpf != DPF_IGNORE) 197 req->count++; 198 } 199 return (AE_OK); 200 } 201 202 static ACPI_STATUS 203 link_add_crs(ACPI_RESOURCE *res, void *context) 204 { 205 struct link_res_request *req; 206 struct link *link; 207 208 ACPI_SERIAL_ASSERT(pci_link); 209 req = (struct link_res_request *)context; 210 switch (res->Id) { 211 case ACPI_RSTYPE_START_DPF: 212 switch (req->in_dpf) { 213 case DPF_OUTSIDE: 214 /* We've started the first DPF. */ 215 req->in_dpf = DPF_FIRST; 216 break; 217 case DPF_FIRST: 218 /* We've started the second DPF. */ 219 panic( 220 "%s: Multiple dependent functions within a current resource", 221 __func__); 222 break; 223 } 224 break; 225 case ACPI_RSTYPE_END_DPF: 226 /* We are finished with DPF parsing. */ 227 KASSERT(req->in_dpf != DPF_OUTSIDE, 228 ("%s: end dpf when not parsing a dpf", __func__)); 229 req->in_dpf = DPF_OUTSIDE; 230 break; 231 case ACPI_RSTYPE_IRQ: 232 case ACPI_RSTYPE_EXT_IRQ: 233 KASSERT(req->link_index < req->sc->pl_num_links, 234 ("%s: array boundary violation", __func__)); 235 link = &req->sc->pl_links[req->link_index]; 236 link->l_res_index = req->res_index; 237 req->link_index++; 238 req->res_index++; 239 240 /* 241 * Only use the current value if there's one IRQ. Some 242 * systems return multiple IRQs (which is nonsense for _CRS) 243 * when the link hasn't been programmed. 244 */ 245 if (res->Id == ACPI_RSTYPE_IRQ) { 246 if (res->Data.Irq.NumberOfInterrupts == 1) 247 link->l_irq = res->Data.Irq.Interrupts[0]; 248 } else if (res->Data.ExtendedIrq.NumberOfInterrupts == 1) 249 link->l_irq = res->Data.ExtendedIrq.Interrupts[0]; 250 251 /* 252 * An IRQ of zero means that the link isn't routed. 253 */ 254 if (link->l_irq == 0) 255 link->l_irq = PCI_INVALID_IRQ; 256 break; 257 default: 258 req->res_index++; 259 } 260 return (AE_OK); 261 } 262 263 /* 264 * Populate the set of possible IRQs for each device. 265 */ 266 static ACPI_STATUS 267 link_add_prs(ACPI_RESOURCE *res, void *context) 268 { 269 struct link_res_request *req; 270 struct link *link; 271 UINT32 *irqs; 272 int i; 273 274 ACPI_SERIAL_ASSERT(pci_link); 275 req = (struct link_res_request *)context; 276 switch (res->Id) { 277 case ACPI_RSTYPE_START_DPF: 278 switch (req->in_dpf) { 279 case DPF_OUTSIDE: 280 /* We've started the first DPF. */ 281 req->in_dpf = DPF_FIRST; 282 break; 283 case DPF_FIRST: 284 /* We've started the second DPF. */ 285 req->in_dpf = DPF_IGNORE; 286 break; 287 } 288 break; 289 case ACPI_RSTYPE_END_DPF: 290 /* We are finished with DPF parsing. */ 291 KASSERT(req->in_dpf != DPF_OUTSIDE, 292 ("%s: end dpf when not parsing a dpf", __func__)); 293 req->in_dpf = DPF_OUTSIDE; 294 break; 295 case ACPI_RSTYPE_IRQ: 296 case ACPI_RSTYPE_EXT_IRQ: 297 /* 298 * Don't parse resources if we are in a DPF set that we are 299 * ignoring. 300 */ 301 if (req->in_dpf == DPF_IGNORE) 302 break; 303 304 KASSERT(req->link_index < req->sc->pl_num_links, 305 ("%s: array boundary violation", __func__)); 306 link = &req->sc->pl_links[req->link_index]; 307 if (link->l_res_index == -1) { 308 KASSERT(req->sc->pl_crs_bad, 309 ("res_index should be set")); 310 link->l_res_index = req->res_index; 311 } 312 req->link_index++; 313 req->res_index++; 314 315 /* 316 * Stash a copy of the resource for later use when doing 317 * _SRS. 318 */ 319 bcopy(res, &link->l_prs_template, sizeof(ACPI_RESOURCE)); 320 if (res->Id == ACPI_RSTYPE_IRQ) { 321 link->l_num_irqs = res->Data.Irq.NumberOfInterrupts; 322 irqs = res->Data.Irq.Interrupts; 323 } else { 324 link->l_num_irqs = 325 res->Data.ExtendedIrq.NumberOfInterrupts; 326 irqs = res->Data.ExtendedIrq.Interrupts; 327 } 328 if (link->l_num_irqs == 0) 329 break; 330 331 /* 332 * Save a list of the valid IRQs. Also, if all of the 333 * valid IRQs are ISA IRQs, then mark this link as 334 * routed via an ISA interrupt. 335 */ 336 link->l_isa_irq = TRUE; 337 link->l_irqs = malloc(sizeof(int) * link->l_num_irqs, 338 M_PCI_LINK, M_WAITOK | M_ZERO); 339 for (i = 0; i < link->l_num_irqs; i++) { 340 link->l_irqs[i] = irqs[i]; 341 if (irqs[i] >= NUM_ISA_INTERRUPTS) 342 link->l_isa_irq = FALSE; 343 } 344 break; 345 default: 346 if (req->in_dpf == DPF_IGNORE) 347 break; 348 if (req->sc->pl_crs_bad) 349 device_printf(req->sc->pl_dev, 350 "Warning: possible resource %d will be lost during _SRS\n", 351 req->res_index); 352 req->res_index++; 353 } 354 return (AE_OK); 355 } 356 357 static int 358 link_valid_irq(struct link *link, int irq) 359 { 360 int i; 361 362 ACPI_SERIAL_ASSERT(pci_link); 363 364 /* Invalid interrupts are never valid. */ 365 if (!PCI_INTERRUPT_VALID(irq)) 366 return (FALSE); 367 368 /* Any interrupt in the list of possible interrupts is valid. */ 369 for (i = 0; i < link->l_num_irqs; i++) 370 if (link->l_irqs[i] == irq) 371 return (TRUE); 372 373 /* 374 * For links routed via an ISA interrupt, if the SCI is routed via 375 * an ISA interrupt, the SCI is always treated as a valid IRQ. 376 */ 377 if (link->l_isa_irq && AcpiGbl_FADT->SciInt == irq && 378 irq < NUM_ISA_INTERRUPTS) 379 return (TRUE); 380 381 /* If the interrupt wasn't found in the list it is not valid. */ 382 return (FALSE); 383 } 384 385 static void 386 acpi_pci_link_dump(struct acpi_pci_link_softc *sc) 387 { 388 struct link *link; 389 int i, j; 390 391 ACPI_SERIAL_ASSERT(pci_link); 392 printf("Index IRQ Rtd Ref IRQs\n"); 393 for (i = 0; i < sc->pl_num_links; i++) { 394 link = &sc->pl_links[i]; 395 printf("%5d %3d %c %3d ", i, link->l_irq, 396 link->l_routed ? 'Y' : 'N', link->l_references); 397 if (link->l_num_irqs == 0) 398 printf(" none"); 399 else for (j = 0; j < link->l_num_irqs; j++) 400 printf(" %d", link->l_irqs[j]); 401 printf("\n"); 402 } 403 } 404 405 static int 406 acpi_pci_link_attach(device_t dev) 407 { 408 struct acpi_pci_link_softc *sc; 409 struct link_count_request creq; 410 struct link_res_request rreq; 411 ACPI_STATUS status; 412 int i; 413 414 sc = device_get_softc(dev); 415 sc->pl_dev = dev; 416 ACPI_SERIAL_BEGIN(pci_link); 417 418 /* 419 * Count the number of current resources so we know how big of 420 * a link array to allocate. On some systems, _CRS is broken, 421 * so for those systems try to derive the count from _PRS instead. 422 */ 423 creq.in_dpf = DPF_OUTSIDE; 424 creq.count = 0; 425 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 426 acpi_count_irq_resources, &creq); 427 sc->pl_crs_bad = ACPI_FAILURE(status); 428 if (sc->pl_crs_bad) { 429 creq.in_dpf = DPF_OUTSIDE; 430 creq.count = 0; 431 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 432 acpi_count_irq_resources, &creq); 433 if (ACPI_FAILURE(status)) { 434 device_printf(dev, 435 "Unable to parse _CRS or _PRS: %s\n", 436 AcpiFormatException(status)); 437 ACPI_SERIAL_END(pci_link); 438 return (ENXIO); 439 } 440 } 441 sc->pl_num_links = creq.count; 442 if (creq.count == 0) 443 return (0); 444 sc->pl_links = malloc(sizeof(struct link) * sc->pl_num_links, 445 M_PCI_LINK, M_WAITOK | M_ZERO); 446 447 /* Initialize the child links. */ 448 for (i = 0; i < sc->pl_num_links; i++) { 449 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 450 sc->pl_links[i].l_bios_irq = PCI_INVALID_IRQ; 451 sc->pl_links[i].l_sc = sc; 452 sc->pl_links[i].l_isa_irq = FALSE; 453 sc->pl_links[i].l_res_index = -1; 454 } 455 456 /* Try to read the current settings from _CRS if it is valid. */ 457 if (!sc->pl_crs_bad) { 458 rreq.in_dpf = DPF_OUTSIDE; 459 rreq.link_index = 0; 460 rreq.res_index = 0; 461 rreq.sc = sc; 462 status = AcpiWalkResources(acpi_get_handle(dev), "_CRS", 463 link_add_crs, &rreq); 464 if (ACPI_FAILURE(status)) { 465 device_printf(dev, "Unable to parse _CRS: %s\n", 466 AcpiFormatException(status)); 467 goto fail; 468 } 469 } 470 471 /* 472 * Try to read the possible settings from _PRS. Note that if the 473 * _CRS is toast, we depend on having a working _PRS. However, if 474 * _CRS works, then it is ok for _PRS to be missing. 475 */ 476 rreq.in_dpf = DPF_OUTSIDE; 477 rreq.link_index = 0; 478 rreq.res_index = 0; 479 rreq.sc = sc; 480 status = AcpiWalkResources(acpi_get_handle(dev), "_PRS", 481 link_add_prs, &rreq); 482 if (ACPI_FAILURE(status) && 483 (status != AE_NOT_FOUND || sc->pl_crs_bad)) { 484 device_printf(dev, "Unable to parse _PRS: %s\n", 485 AcpiFormatException(status)); 486 goto fail; 487 } 488 if (bootverbose) { 489 device_printf(dev, "Links after initial probe:\n"); 490 acpi_pci_link_dump(sc); 491 } 492 493 /* Verify initial IRQs if we have _PRS. */ 494 if (status != AE_NOT_FOUND) 495 for (i = 0; i < sc->pl_num_links; i++) 496 if (!link_valid_irq(&sc->pl_links[i], 497 sc->pl_links[i].l_irq)) 498 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 499 if (bootverbose) { 500 device_printf(dev, "Links after initial validation:\n"); 501 acpi_pci_link_dump(sc); 502 } 503 504 /* Save initial IRQs. */ 505 for (i = 0; i < sc->pl_num_links; i++) 506 sc->pl_links[i].l_initial_irq = sc->pl_links[i].l_irq; 507 508 /* 509 * Try to disable this link. If successful, set the current IRQ to 510 * zero and flags to indicate this link is not routed. If we can't 511 * run _DIS (i.e., the method doesn't exist), assume the initial 512 * IRQ was routed by the BIOS. 513 */ 514 if (ACPI_SUCCESS(AcpiEvaluateObject(acpi_get_handle(dev), "_DIS", NULL, 515 NULL))) 516 for (i = 0; i < sc->pl_num_links; i++) 517 sc->pl_links[i].l_irq = PCI_INVALID_IRQ; 518 else 519 for (i = 0; i < sc->pl_num_links; i++) 520 if (PCI_INTERRUPT_VALID(sc->pl_links[i].l_irq)) 521 sc->pl_links[i].l_routed = TRUE; 522 if (bootverbose) { 523 device_printf(dev, "Links after disable:\n"); 524 acpi_pci_link_dump(sc); 525 } 526 ACPI_SERIAL_END(pci_link); 527 return (0); 528 fail: 529 ACPI_SERIAL_END(pci_link); 530 for (i = 0; i < sc->pl_num_links; i++) 531 if (sc->pl_links[i].l_irqs != NULL) 532 free(sc->pl_links[i].l_irqs, M_PCI_LINK); 533 free(sc->pl_links, M_PCI_LINK); 534 return (ENXIO); 535 } 536 537 /* XXX: Note that this is identical to pci_pir_search_irq(). */ 538 static uint8_t 539 acpi_pci_link_search_irq(int bus, int device, int pin) 540 { 541 uint32_t value; 542 uint8_t func, maxfunc; 543 544 /* See if we have a valid device at function 0. */ 545 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); 546 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) 547 return (PCI_INVALID_IRQ); 548 if (value & PCIM_MFDEV) 549 maxfunc = PCI_FUNCMAX; 550 else 551 maxfunc = 0; 552 553 /* Scan all possible functions at this device. */ 554 for (func = 0; func <= maxfunc; func++) { 555 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); 556 if (value == 0xffffffff) 557 continue; 558 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); 559 560 /* 561 * See if it uses the pin in question. Note that the passed 562 * in pin uses 0 for A, .. 3 for D whereas the intpin 563 * register uses 0 for no interrupt, 1 for A, .. 4 for D. 564 */ 565 if (value != pin + 1) 566 continue; 567 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); 568 if (bootverbose) 569 printf( 570 "ACPI: Found matching pin for %d.%d.INT%c at func %d: %d\n", 571 bus, device, pin + 'A', func, value); 572 if (value != PCI_INVALID_IRQ) 573 return (value); 574 } 575 return (PCI_INVALID_IRQ); 576 } 577 578 /* 579 * Find the link structure that corresponds to the resource index passed in 580 * via 'source_index'. 581 */ 582 static struct link * 583 acpi_pci_link_lookup(device_t dev, int source_index) 584 { 585 struct acpi_pci_link_softc *sc; 586 int i; 587 588 ACPI_SERIAL_ASSERT(pci_link); 589 sc = device_get_softc(dev); 590 for (i = 0; i < sc->pl_num_links; i++) 591 if (sc->pl_links[i].l_res_index == source_index) 592 return (&sc->pl_links[i]); 593 return (NULL); 594 } 595 596 void 597 acpi_pci_link_add_reference(device_t dev, int index, device_t pcib, int slot, 598 int pin) 599 { 600 struct link *link; 601 uint8_t bios_irq; 602 603 /* Bump the reference count. */ 604 ACPI_SERIAL_BEGIN(pci_link); 605 link = acpi_pci_link_lookup(dev, index); 606 if (link == NULL) 607 panic("%s: apparently invalid index %d", __func__, index); 608 link->l_references++; 609 if (link->l_routed) 610 pci_link_interrupt_weights[link->l_irq]++; 611 612 /* Try to find a BIOS IRQ setting from any matching devices. */ 613 bios_irq = acpi_pci_link_search_irq(pcib_get_bus(pcib), slot, pin); 614 if (!PCI_INTERRUPT_VALID(bios_irq)) { 615 ACPI_SERIAL_END(pci_link); 616 return; 617 } 618 619 /* Validate the BIOS IRQ. */ 620 if (!link_valid_irq(link, bios_irq)) { 621 device_printf(dev, "BIOS IRQ %u for %d.%d.INT%c is invalid\n", 622 bios_irq, pcib_get_bus(pcib), slot, pin + 'A'); 623 } else if (!PCI_INTERRUPT_VALID(link->l_bios_irq)) { 624 link->l_bios_irq = bios_irq; 625 if (bios_irq < NUM_ISA_INTERRUPTS) 626 pci_link_bios_isa_irqs |= (1 << bios_irq); 627 if (bios_irq != link->l_initial_irq && 628 PCI_INTERRUPT_VALID(link->l_initial_irq)) 629 device_printf(dev, 630 "BIOS IRQ %u does not match initial IRQ %u\n", 631 bios_irq, link->l_initial_irq); 632 } else if (bios_irq != link->l_bios_irq) 633 device_printf(dev, 634 "BIOS IRQ %u for %d.%d.INT%c does not match previous BIOS IRQ %u\n", 635 bios_irq, pcib_get_bus(pcib), slot, pin + 'A', 636 link->l_bios_irq); 637 ACPI_SERIAL_END(pci_link); 638 } 639 640 static ACPI_STATUS 641 acpi_pci_link_srs_from_crs(struct acpi_pci_link_softc *sc, ACPI_BUFFER *srsbuf) 642 { 643 ACPI_RESOURCE *resource, *end, newres, *resptr; 644 ACPI_BUFFER crsbuf; 645 ACPI_STATUS status; 646 struct link *link; 647 int i, in_dpf; 648 649 /* Fetch the _CRS. */ 650 ACPI_SERIAL_ASSERT(pci_link); 651 crsbuf.Pointer = NULL; 652 crsbuf.Length = ACPI_ALLOCATE_BUFFER; 653 status = AcpiGetCurrentResources(acpi_get_handle(sc->pl_dev), &crsbuf); 654 if (ACPI_SUCCESS(status) && crsbuf.Pointer == NULL) 655 status = AE_NO_MEMORY; 656 if (ACPI_FAILURE(status)) { 657 if (bootverbose) 658 device_printf(sc->pl_dev, 659 "Unable to fetch current resources: %s\n", 660 AcpiFormatException(status)); 661 return (status); 662 } 663 664 /* Fill in IRQ resources via link structures. */ 665 srsbuf->Pointer = NULL; 666 link = sc->pl_links; 667 i = 0; 668 in_dpf = DPF_OUTSIDE; 669 resource = (ACPI_RESOURCE *)crsbuf.Pointer; 670 end = (ACPI_RESOURCE *)((char *)crsbuf.Pointer + crsbuf.Length); 671 for (;;) { 672 switch (resource->Id) { 673 case ACPI_RSTYPE_START_DPF: 674 switch (in_dpf) { 675 case DPF_OUTSIDE: 676 /* We've started the first DPF. */ 677 in_dpf = DPF_FIRST; 678 break; 679 case DPF_FIRST: 680 /* We've started the second DPF. */ 681 panic( 682 "%s: Multiple dependent functions within a current resource", 683 __func__); 684 break; 685 } 686 resptr = NULL; 687 break; 688 case ACPI_RSTYPE_END_DPF: 689 /* We are finished with DPF parsing. */ 690 KASSERT(in_dpf != DPF_OUTSIDE, 691 ("%s: end dpf when not parsing a dpf", __func__)); 692 in_dpf = DPF_OUTSIDE; 693 resptr = NULL; 694 break; 695 case ACPI_RSTYPE_IRQ: 696 MPASS(i < sc->pl_num_links); 697 MPASS(link->l_prs_template.Id == ACPI_RSTYPE_IRQ); 698 newres = link->l_prs_template; 699 resptr = &newres; 700 resptr->Data.Irq.NumberOfInterrupts = 1; 701 if (PCI_INTERRUPT_VALID(link->l_irq)) { 702 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 703 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 704 __func__, link->l_irq)); 705 resptr->Data.Irq.Interrupts[0] = link->l_irq; 706 } else 707 resptr->Data.Irq.Interrupts[0] = 0; 708 link++; 709 i++; 710 break; 711 case ACPI_RSTYPE_EXT_IRQ: 712 MPASS(i < sc->pl_num_links); 713 MPASS(link->l_prs_template.Id == ACPI_RSTYPE_EXT_IRQ); 714 newres = link->l_prs_template; 715 resptr = &newres; 716 resptr->Data.ExtendedIrq.NumberOfInterrupts = 1; 717 if (PCI_INTERRUPT_VALID(link->l_irq)) 718 resptr->Data.ExtendedIrq.Interrupts[0] = 719 link->l_irq; 720 else 721 resptr->Data.ExtendedIrq.Interrupts[0] = 0; 722 link++; 723 i++; 724 break; 725 default: 726 resptr = resource; 727 } 728 if (resptr != NULL) { 729 status = acpi_AppendBufferResource(srsbuf, resptr); 730 if (ACPI_FAILURE(status)) { 731 device_printf(sc->pl_dev, 732 "Unable to build resources: %s\n", 733 AcpiFormatException(status)); 734 if (srsbuf->Pointer != NULL) 735 AcpiOsFree(srsbuf->Pointer); 736 AcpiOsFree(crsbuf.Pointer); 737 return (status); 738 } 739 } 740 if (resource->Id == ACPI_RSTYPE_END_TAG) 741 break; 742 resource = ACPI_NEXT_RESOURCE(resource); 743 if (resource >= end) 744 break; 745 } 746 AcpiOsFree(crsbuf.Pointer); 747 return (AE_OK); 748 } 749 750 static ACPI_STATUS 751 acpi_pci_link_srs_from_links(struct acpi_pci_link_softc *sc, 752 ACPI_BUFFER *srsbuf) 753 { 754 ACPI_RESOURCE newres; 755 ACPI_STATUS status; 756 struct link *link; 757 int i; 758 759 /* Start off with an empty buffer. */ 760 srsbuf->Pointer = NULL; 761 link = sc->pl_links; 762 for (i = 0; i < sc->pl_num_links; i++) { 763 764 /* Add a new IRQ resource from each link. */ 765 link = &sc->pl_links[i]; 766 newres = link->l_prs_template; 767 if (newres.Id == ACPI_RSTYPE_IRQ) { 768 769 /* Build an IRQ resource. */ 770 newres.Data.Irq.NumberOfInterrupts = 1; 771 if (PCI_INTERRUPT_VALID(link->l_irq)) { 772 KASSERT(link->l_irq < NUM_ISA_INTERRUPTS, 773 ("%s: can't put non-ISA IRQ %d in legacy IRQ resource type", 774 __func__, link->l_irq)); 775 newres.Data.Irq.Interrupts[0] = link->l_irq; 776 } else 777 newres.Data.Irq.Interrupts[0] = 0; 778 } else { 779 780 /* Build an ExtIRQ resuorce. */ 781 newres.Data.ExtendedIrq.NumberOfInterrupts = 1; 782 if (PCI_INTERRUPT_VALID(link->l_irq)) 783 newres.Data.ExtendedIrq.Interrupts[0] = 784 link->l_irq; 785 else 786 newres.Data.ExtendedIrq.Interrupts[0] = 0; 787 } 788 789 /* Add the new resource to the end of the _SRS buffer. */ 790 status = acpi_AppendBufferResource(srsbuf, &newres); 791 if (ACPI_FAILURE(status)) { 792 device_printf(sc->pl_dev, 793 "Unable to build resources: %s\n", 794 AcpiFormatException(status)); 795 if (srsbuf->Pointer != NULL) 796 AcpiOsFree(srsbuf->Pointer); 797 return (status); 798 } 799 } 800 return (AE_OK); 801 } 802 803 static ACPI_STATUS 804 acpi_pci_link_route_irqs(device_t dev) 805 { 806 struct acpi_pci_link_softc *sc; 807 ACPI_RESOURCE *resource, *end; 808 ACPI_BUFFER srsbuf; 809 ACPI_STATUS status; 810 struct link *link; 811 int i; 812 813 ACPI_SERIAL_ASSERT(pci_link); 814 sc = device_get_softc(dev); 815 if (sc->pl_crs_bad) 816 status = acpi_pci_link_srs_from_links(sc, &srsbuf); 817 else 818 status = acpi_pci_link_srs_from_crs(sc, &srsbuf); 819 820 /* Write out new resources via _SRS. */ 821 status = AcpiSetCurrentResources(acpi_get_handle(dev), &srsbuf); 822 if (ACPI_FAILURE(status)) { 823 device_printf(dev, "Unable to route IRQs: %s\n", 824 AcpiFormatException(status)); 825 AcpiOsFree(srsbuf.Pointer); 826 return (status); 827 } 828 829 /* 830 * Perform acpi_config_intr() on each IRQ resource if it was just 831 * routed for the first time. 832 */ 833 link = sc->pl_links; 834 i = 0; 835 resource = (ACPI_RESOURCE *)srsbuf.Pointer; 836 end = (ACPI_RESOURCE *)((char *)srsbuf.Pointer + srsbuf.Length); 837 for (;;) { 838 if (resource->Id == ACPI_RSTYPE_END_TAG) 839 break; 840 switch (resource->Id) { 841 case ACPI_RSTYPE_IRQ: 842 case ACPI_RSTYPE_EXT_IRQ: 843 MPASS(i < sc->pl_num_links); 844 845 /* 846 * Only configure the interrupt and update the 847 * weights if this link has a valid IRQ and was 848 * previously unrouted. 849 */ 850 if (!link->l_routed && 851 PCI_INTERRUPT_VALID(link->l_irq)) { 852 link->l_routed = TRUE; 853 acpi_config_intr(dev, resource); 854 pci_link_interrupt_weights[link->l_irq] += 855 link->l_references; 856 } 857 link++; 858 i++; 859 break; 860 } 861 resource = ACPI_NEXT_RESOURCE(resource); 862 if (resource >= end) 863 break; 864 } 865 AcpiOsFree(srsbuf.Pointer); 866 return (AE_OK); 867 } 868 869 static int 870 acpi_pci_link_resume(device_t dev) 871 { 872 ACPI_STATUS status; 873 874 ACPI_SERIAL_BEGIN(pci_link); 875 status = acpi_pci_link_route_irqs(dev); 876 ACPI_SERIAL_END(pci_link); 877 if (ACPI_FAILURE(status)) 878 return (ENXIO); 879 else 880 return (0); 881 } 882 883 /* 884 * Pick an IRQ to use for this unrouted link. 885 */ 886 static uint8_t 887 acpi_pci_link_choose_irq(device_t dev, struct link *link) 888 { 889 char tunable_buffer[64], link_name[5]; 890 u_int8_t best_irq, pos_irq; 891 int best_weight, pos_weight, i; 892 893 KASSERT(!link->l_routed, ("%s: link already routed", __func__)); 894 KASSERT(!PCI_INTERRUPT_VALID(link->l_irq), 895 ("%s: link already has an IRQ", __func__)); 896 897 /* Check for a tunable override and use it if it is valid. */ 898 if (ACPI_SUCCESS(acpi_short_name(acpi_get_handle(dev), link_name, 899 sizeof(link_name)))) { 900 snprintf(tunable_buffer, sizeof(tunable_buffer), 901 "hw.pci.link.%s.%d.irq", link_name, link->l_res_index); 902 if (getenv_int(tunable_buffer, &i) && 903 PCI_INTERRUPT_VALID(i) && link_valid_irq(link, i)) 904 return (i); 905 snprintf(tunable_buffer, sizeof(tunable_buffer), 906 "hw.pci.link.%s.irq", link_name); 907 if (getenv_int(tunable_buffer, &i) && 908 PCI_INTERRUPT_VALID(i) && link_valid_irq(link, i)) 909 return (i); 910 } 911 912 /* 913 * If we have a valid BIOS IRQ, use that. We trust what the BIOS 914 * says it routed over what _CRS says the link thinks is routed. 915 */ 916 if (PCI_INTERRUPT_VALID(link->l_bios_irq)) 917 return (link->l_bios_irq); 918 919 /* 920 * If we don't have a BIOS IRQ but do have a valid IRQ from _CRS, 921 * then use that. 922 */ 923 if (PCI_INTERRUPT_VALID(link->l_initial_irq)) 924 return (link->l_initial_irq); 925 926 /* 927 * Ok, we have no useful hints, so we have to pick from the 928 * possible IRQs. For ISA IRQs we only use interrupts that 929 * have already been used by the BIOS. 930 */ 931 best_irq = PCI_INVALID_IRQ; 932 best_weight = INT_MAX; 933 for (i = 0; i < link->l_num_irqs; i++) { 934 pos_irq = link->l_irqs[i]; 935 if (pos_irq < NUM_ISA_INTERRUPTS && 936 (pci_link_bios_isa_irqs & 1 << pos_irq) == 0) 937 continue; 938 pos_weight = pci_link_interrupt_weights[pos_irq]; 939 if (pos_weight < best_weight) { 940 best_weight = pos_weight; 941 best_irq = pos_irq; 942 } 943 } 944 945 /* 946 * If this is an ISA IRQ, try using the SCI if it is also an ISA 947 * interrupt as a fallback. 948 */ 949 if (link->l_isa_irq) { 950 pos_irq = AcpiGbl_FADT->SciInt; 951 pos_weight = pci_link_interrupt_weights[pos_irq]; 952 if (pos_weight < best_weight) { 953 best_weight = pos_weight; 954 best_irq = pos_irq; 955 } 956 } 957 958 if (bootverbose) { 959 if (PCI_INTERRUPT_VALID(best_irq)) 960 device_printf(dev, "Picked IRQ %u with weight %d\n", 961 best_irq, best_weight); 962 } else 963 device_printf(dev, "Unable to choose an IRQ\n"); 964 return (best_irq); 965 } 966 967 int 968 acpi_pci_link_route_interrupt(device_t dev, int index) 969 { 970 struct link *link; 971 972 ACPI_SERIAL_BEGIN(pci_link); 973 link = acpi_pci_link_lookup(dev, index); 974 if (link == NULL) 975 panic("%s: apparently invalid index %d", __func__, index); 976 977 /* 978 * If this link device is already routed to an interrupt, just return 979 * the interrupt it is routed to. 980 */ 981 if (link->l_routed) { 982 KASSERT(PCI_INTERRUPT_VALID(link->l_irq), 983 ("%s: link is routed but has an invalid IRQ", __func__)); 984 ACPI_SERIAL_END(pci_link); 985 return (link->l_irq); 986 } 987 988 /* Choose an IRQ if we need one. */ 989 if (!PCI_INTERRUPT_VALID(link->l_irq)) { 990 link->l_irq = acpi_pci_link_choose_irq(dev, link); 991 992 /* 993 * Try to route the interrupt we picked. If it fails, then 994 * assume the interrupt is not routed. 995 */ 996 if (PCI_INTERRUPT_VALID(link->l_irq)) { 997 acpi_pci_link_route_irqs(dev); 998 if (!link->l_routed) 999 link->l_irq = PCI_INVALID_IRQ; 1000 } 1001 } 1002 ACPI_SERIAL_END(pci_link); 1003 1004 return (link->l_irq); 1005 } 1006 1007 /* 1008 * This is gross, but we abuse the identify routine to perform one-time 1009 * SYSINIT() style initialization for the driver. 1010 */ 1011 static void 1012 acpi_pci_link_identify(driver_t *driver, device_t parent) 1013 { 1014 1015 /* 1016 * If the SCI is an ISA IRQ, add it to the bitmask of known good 1017 * ISA IRQs. 1018 * 1019 * XXX: If we are using the APIC, the SCI might have been 1020 * rerouted to an APIC pin in which case this is invalid. However, 1021 * if we are using the APIC, we also shouldn't be having any PCI 1022 * interrupts routed via ISA IRQs, so this is probably ok. 1023 */ 1024 if (AcpiGbl_FADT->SciInt < NUM_ISA_INTERRUPTS) 1025 pci_link_bios_isa_irqs |= (1 << AcpiGbl_FADT->SciInt); 1026 } 1027 1028 static device_method_t acpi_pci_link_methods[] = { 1029 /* Device interface */ 1030 DEVMETHOD(device_identify, acpi_pci_link_identify), 1031 DEVMETHOD(device_probe, acpi_pci_link_probe), 1032 DEVMETHOD(device_attach, acpi_pci_link_attach), 1033 DEVMETHOD(device_resume, acpi_pci_link_resume), 1034 1035 {0, 0} 1036 }; 1037 1038 static driver_t acpi_pci_link_driver = { 1039 "pci_link", 1040 acpi_pci_link_methods, 1041 sizeof(struct acpi_pci_link_softc), 1042 }; 1043 1044 static devclass_t pci_link_devclass; 1045 1046 DRIVER_MODULE(acpi_pci_link, acpi, acpi_pci_link_driver, pci_link_devclass, 0, 1047 0); 1048 MODULE_DEPEND(acpi_pci_link, acpi, 1, 1, 1); 1049