| 1 | /*- |
| 2 | * Copyright (c) 1997, Stefan Esser <se@freebsd.org> |
| 3 | * Copyright (c) 2000, Michael Smith <msmith@freebsd.org> |
| 4 | * Copyright (c) 2000, BSDi |
| 5 | * Copyright (c) 2004, John Baldwin <jhb@FreeBSD.org> |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice unmodified, this list of conditions, and the following |
| 13 | * disclaimer. |
| 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer in the |
| 16 | * documentation and/or other materials provided with the distribution. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 28 | * |
| 29 | * $FreeBSD: src/sys/i386/pci/pci_pir.c,v 1.120.2.1.4.1 2009/04/15 03:14:26 kensmith Exp $ |
| 30 | */ |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/systm.h> |
| 34 | #include <sys/bus.h> |
| 35 | #include <sys/kernel.h> |
| 36 | #include <sys/malloc.h> |
| 37 | #include <sys/module.h> |
| 38 | #include <sys/sysctl.h> |
| 39 | #include <sys/machintr.h> |
| 40 | #include <vm/vm.h> |
| 41 | #include <vm/pmap.h> |
| 42 | #include <vm/vm_param.h> |
| 43 | #include <machine/md_var.h> |
| 44 | #include <bus/pci/pcivar.h> |
| 45 | #include <bus/pci/pcireg.h> |
| 46 | #include "pci_cfgreg.h" |
| 47 | #include <machine/segments.h> |
| 48 | #include <machine/pc/bios.h> |
| 49 | |
| 50 | #define NUM_ISA_INTERRUPTS 16 |
| 51 | |
| 52 | /* |
| 53 | * A link device. Loosely based on the ACPI PCI link device. This doesn't |
| 54 | * try to support priorities for different ISA interrupts. |
| 55 | */ |
| 56 | struct pci_link { |
| 57 | TAILQ_ENTRY(pci_link) pl_links; |
| 58 | uint8_t pl_id; |
| 59 | uint8_t pl_irq; |
| 60 | uint16_t pl_irqmask; |
| 61 | int pl_references; |
| 62 | int pl_routed; |
| 63 | }; |
| 64 | |
| 65 | struct pci_link_lookup { |
| 66 | struct pci_link **pci_link_ptr; |
| 67 | int bus; |
| 68 | int device; |
| 69 | int pin; |
| 70 | }; |
| 71 | |
| 72 | struct pci_dev_lookup { |
| 73 | uint8_t link; |
| 74 | int bus; |
| 75 | int device; |
| 76 | int pin; |
| 77 | }; |
| 78 | |
| 79 | typedef void pir_entry_handler(struct PIR_entry *entry, |
| 80 | struct PIR_intpin* intpin, void *arg); |
| 81 | |
| 82 | static void pci_print_irqmask(u_int16_t irqs); |
| 83 | static int pci_pir_biosroute(int bus, int device, int func, int pin, |
| 84 | int irq); |
| 85 | static int pci_pir_choose_irq(struct pci_link *pci_link, int irqmask); |
| 86 | static void pci_pir_create_links(struct PIR_entry *entry, |
| 87 | struct PIR_intpin *intpin, void *arg); |
| 88 | static void pci_pir_dump_links(void); |
| 89 | static struct pci_link *pci_pir_find_link(uint8_t link_id); |
| 90 | static void pci_pir_find_link_handler(struct PIR_entry *entry, |
| 91 | struct PIR_intpin *intpin, void *arg); |
| 92 | static void pci_pir_initial_irqs(struct PIR_entry *entry, |
| 93 | struct PIR_intpin *intpin, void *arg); |
| 94 | static void pci_pir_parse(void); |
| 95 | static uint8_t pci_pir_search_irq(int bus, int device, int pin); |
| 96 | static int pci_pir_valid_irq(struct pci_link *pci_link, int irq); |
| 97 | static void pci_pir_walk_table(pir_entry_handler *handler, void *arg); |
| 98 | |
| 99 | static MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures"); |
| 100 | |
| 101 | static struct PIR_table *pci_route_table; |
| 102 | static device_t pir_device; |
| 103 | static int pci_route_count, pir_bios_irqs, pir_parsed; |
| 104 | static TAILQ_HEAD(, pci_link) pci_links; |
| 105 | static int pir_interrupt_weight[NUM_ISA_INTERRUPTS]; |
| 106 | |
| 107 | /* sysctl vars */ |
| 108 | SYSCTL_DECL(_hw_pci); |
| 109 | |
| 110 | /* XXX this likely should live in a header file */ |
| 111 | /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */ |
| 112 | #define PCI_IRQ_OVERRIDE_MASK 0xdef8 |
| 113 | |
| 114 | static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK; |
| 115 | TUNABLE_INT("hw.pci.irq_override_mask", &pci_irq_override_mask); |
| 116 | SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RD, |
| 117 | &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK, |
| 118 | "Mask of allowed irqs to try to route when it has no good clue about\n" |
| 119 | "which irqs it should use."); |
| 120 | |
| 121 | /* |
| 122 | * Look for the interrupt routing table. |
| 123 | * |
| 124 | * We use PCI BIOS's PIR table if it's available. $PIR is the standard way |
| 125 | * to do this. Sadly, some machines are not standards conforming and have |
| 126 | * _PIR instead. We shrug and cope by looking for both. |
| 127 | */ |
| 128 | void |
| 129 | pci_pir_open(void) |
| 130 | { |
| 131 | struct PIR_table *pt; |
| 132 | uint32_t sigaddr; |
| 133 | int i; |
| 134 | uint8_t ck, *cv; |
| 135 | |
| 136 | /* Don't try if we've already found a table. */ |
| 137 | if (pci_route_table != NULL) |
| 138 | return; |
| 139 | |
| 140 | /* Look for $PIR and then _PIR. */ |
| 141 | sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0); |
| 142 | if (sigaddr == 0) |
| 143 | sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0); |
| 144 | if (sigaddr == 0) |
| 145 | return; |
| 146 | |
| 147 | /* If we found something, check the checksum and length. */ |
| 148 | /* XXX - Use pmap_mapdev()? */ |
| 149 | pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); |
| 150 | if (pt->pt_header.ph_length <= sizeof(struct PIR_header)) |
| 151 | return; |
| 152 | for (cv = (u_int8_t *)pt, ck = 0, i = 0; |
| 153 | i < (pt->pt_header.ph_length); i++) |
| 154 | ck += cv[i]; |
| 155 | if (ck != 0) { |
| 156 | kprintf("$PIR: checksum failed!\n"); |
| 157 | return; |
| 158 | } |
| 159 | |
| 160 | /* Ok, we've got a valid table. */ |
| 161 | pci_route_table = pt; |
| 162 | pci_route_count = (pt->pt_header.ph_length - |
| 163 | sizeof(struct PIR_header)) / |
| 164 | sizeof(struct PIR_entry); |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Find the pci_link structure for a given link ID. |
| 169 | */ |
| 170 | static struct pci_link * |
| 171 | pci_pir_find_link(uint8_t link_id) |
| 172 | { |
| 173 | struct pci_link *pci_link; |
| 174 | |
| 175 | TAILQ_FOREACH(pci_link, &pci_links, pl_links) { |
| 176 | if (pci_link->pl_id == link_id) |
| 177 | return (pci_link); |
| 178 | } |
| 179 | return (NULL); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Find the link device associated with a PCI device in the table. |
| 184 | */ |
| 185 | static void |
| 186 | pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin, |
| 187 | void *arg) |
| 188 | { |
| 189 | struct pci_link_lookup *lookup; |
| 190 | |
| 191 | lookup = (struct pci_link_lookup *)arg; |
| 192 | if (entry->pe_bus == lookup->bus && |
| 193 | entry->pe_device == lookup->device && |
| 194 | intpin - entry->pe_intpin == lookup->pin) |
| 195 | *lookup->pci_link_ptr = pci_pir_find_link(intpin->link); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Check to see if a possible IRQ setting is valid. |
| 200 | */ |
| 201 | static int |
| 202 | pci_pir_valid_irq(struct pci_link *pci_link, int irq) |
| 203 | { |
| 204 | |
| 205 | if (!PCI_INTERRUPT_VALID(irq)) |
| 206 | return (0); |
| 207 | return (pci_link->pl_irqmask & (1 << irq)); |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * Walk the $PIR executing the worker function for each valid intpin entry |
| 212 | * in the table. The handler is passed a pointer to both the entry and |
| 213 | * the intpin in the entry. |
| 214 | */ |
| 215 | static void |
| 216 | pci_pir_walk_table(pir_entry_handler *handler, void *arg) |
| 217 | { |
| 218 | struct PIR_entry *entry; |
| 219 | struct PIR_intpin *intpin; |
| 220 | int i, pin; |
| 221 | |
| 222 | entry = &pci_route_table->pt_entry[0]; |
| 223 | for (i = 0; i < pci_route_count; i++, entry++) { |
| 224 | intpin = &entry->pe_intpin[0]; |
| 225 | for (pin = 0; pin < 4; pin++, intpin++) |
| 226 | if (intpin->link != 0) |
| 227 | handler(entry, intpin, arg); |
| 228 | } |
| 229 | } |
| 230 | |
| 231 | static void |
| 232 | pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin, |
| 233 | void *arg) |
| 234 | { |
| 235 | struct pci_link *pci_link; |
| 236 | |
| 237 | pci_link = pci_pir_find_link(intpin->link); |
| 238 | if (pci_link != NULL) { |
| 239 | pci_link->pl_references++; |
| 240 | if (intpin->irqs != pci_link->pl_irqmask) { |
| 241 | if (bootverbose) |
| 242 | kprintf( |
| 243 | "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n", |
| 244 | entry->pe_bus, entry->pe_device, |
| 245 | (intpin - entry->pe_intpin) + 'A', |
| 246 | pci_link->pl_id); |
| 247 | pci_link->pl_irqmask &= intpin->irqs; |
| 248 | } |
| 249 | } else { |
| 250 | pci_link = kmalloc(sizeof(struct pci_link), M_PIR, M_WAITOK); |
| 251 | pci_link->pl_id = intpin->link; |
| 252 | pci_link->pl_irqmask = intpin->irqs; |
| 253 | pci_link->pl_irq = PCI_INVALID_IRQ; |
| 254 | pci_link->pl_references = 1; |
| 255 | pci_link->pl_routed = 0; |
| 256 | TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links); |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | /* |
| 261 | * Look to see if any of the function on the PCI device at bus/device have |
| 262 | * an interrupt routed to intpin 'pin' by the BIOS. |
| 263 | */ |
| 264 | static uint8_t |
| 265 | pci_pir_search_irq(int bus, int device, int pin) |
| 266 | { |
| 267 | uint32_t value; |
| 268 | uint8_t func, maxfunc; |
| 269 | |
| 270 | /* See if we have a valid device at function 0. */ |
| 271 | value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1); |
| 272 | if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE) |
| 273 | return (PCI_INVALID_IRQ); |
| 274 | if (value & PCIM_MFDEV) |
| 275 | maxfunc = PCI_FUNCMAX; |
| 276 | else |
| 277 | maxfunc = 0; |
| 278 | |
| 279 | /* Scan all possible functions at this device. */ |
| 280 | for (func = 0; func <= maxfunc; func++) { |
| 281 | value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4); |
| 282 | if (value == 0xffffffff) |
| 283 | continue; |
| 284 | value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1); |
| 285 | |
| 286 | /* |
| 287 | * See if it uses the pin in question. Note that the passed |
| 288 | * in pin uses 0 for A, .. 3 for D whereas the intpin |
| 289 | * register uses 0 for no interrupt, 1 for A, .. 4 for D. |
| 290 | */ |
| 291 | if (value != pin + 1) |
| 292 | continue; |
| 293 | value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1); |
| 294 | if (bootverbose) |
| 295 | kprintf( |
| 296 | "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n", |
| 297 | bus, device, pin + 'A', func, value); |
| 298 | if (value != PCI_INVALID_IRQ) |
| 299 | return (value); |
| 300 | } |
| 301 | return (PCI_INVALID_IRQ); |
| 302 | } |
| 303 | |
| 304 | /* |
| 305 | * Try to initialize IRQ based on this device's IRQ. |
| 306 | */ |
| 307 | static void |
| 308 | pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin, |
| 309 | void *arg) |
| 310 | { |
| 311 | struct pci_link *pci_link; |
| 312 | uint8_t irq, pin; |
| 313 | |
| 314 | pin = intpin - entry->pe_intpin; |
| 315 | pci_link = pci_pir_find_link(intpin->link); |
| 316 | irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin); |
| 317 | if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq) |
| 318 | return; |
| 319 | |
| 320 | /* Don't trust any BIOS IRQs greater than 15. */ |
| 321 | if (irq >= NUM_ISA_INTERRUPTS) { |
| 322 | kprintf( |
| 323 | "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", |
| 324 | irq, entry->pe_bus, entry->pe_device, pin + 'A', |
| 325 | pci_link->pl_id); |
| 326 | return; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * If we don't have an IRQ for this link yet, then we trust the |
| 331 | * BIOS, even if it seems invalid from the $PIR entries. |
| 332 | */ |
| 333 | if (pci_link->pl_irq == PCI_INVALID_IRQ) { |
| 334 | if (!pci_pir_valid_irq(pci_link, irq)) |
| 335 | kprintf( |
| 336 | "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n", |
| 337 | irq, entry->pe_bus, entry->pe_device, pin + 'A', |
| 338 | pci_link->pl_id); |
| 339 | pci_link->pl_irq = irq; |
| 340 | pci_link->pl_routed = 1; |
| 341 | return; |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * We have an IRQ and it doesn't match the current IRQ for this |
| 346 | * link. If the new IRQ is invalid, then warn about it and ignore |
| 347 | * it. If the old IRQ is invalid and the new IRQ is valid, then |
| 348 | * prefer the new IRQ instead. If both IRQs are valid, then just |
| 349 | * use the first one. Note that if we ever get into this situation |
| 350 | * we are having to guess which setting the BIOS actually routed. |
| 351 | * Perhaps we should just give up instead. |
| 352 | */ |
| 353 | if (!pci_pir_valid_irq(pci_link, irq)) { |
| 354 | kprintf( |
| 355 | "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n", |
| 356 | irq, entry->pe_bus, entry->pe_device, pin + 'A', |
| 357 | pci_link->pl_id); |
| 358 | } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) { |
| 359 | kprintf( |
| 360 | "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n", |
| 361 | irq, entry->pe_bus, entry->pe_device, pin + 'A', |
| 362 | pci_link->pl_id, pci_link->pl_irq); |
| 363 | pci_link->pl_irq = irq; |
| 364 | pci_link->pl_routed = 1; |
| 365 | } else |
| 366 | kprintf( |
| 367 | "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n", |
| 368 | irq, entry->pe_bus, entry->pe_device, pin + 'A', |
| 369 | pci_link->pl_id, pci_link->pl_irq); |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Parse $PIR to enumerate link devices and attempt to determine their |
| 374 | * initial state. This could perhaps be cleaner if we had drivers for the |
| 375 | * various interrupt routers as they could read the initial IRQ for each |
| 376 | * link. |
| 377 | */ |
| 378 | static void |
| 379 | pci_pir_parse(void) |
| 380 | { |
| 381 | char tunable_buffer[64]; |
| 382 | struct pci_link *pci_link; |
| 383 | int i, irq; |
| 384 | |
| 385 | /* Only parse once. */ |
| 386 | if (pir_parsed) |
| 387 | return; |
| 388 | pir_parsed = 1; |
| 389 | |
| 390 | /* Enumerate link devices. */ |
| 391 | TAILQ_INIT(&pci_links); |
| 392 | pci_pir_walk_table(pci_pir_create_links, NULL); |
| 393 | if (bootverbose) { |
| 394 | kprintf("$PIR: Links after initial probe:\n"); |
| 395 | pci_pir_dump_links(); |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * Check to see if the BIOS has already routed any of the links by |
| 400 | * checking each device connected to each link to see if it has a |
| 401 | * valid IRQ. |
| 402 | */ |
| 403 | pci_pir_walk_table(pci_pir_initial_irqs, NULL); |
| 404 | if (bootverbose) { |
| 405 | kprintf("$PIR: Links after initial IRQ discovery:\n"); |
| 406 | pci_pir_dump_links(); |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Allow the user to override the IRQ for a given link device. We |
| 411 | * allow invalid IRQs to be specified but warn about them. An IRQ |
| 412 | * of 255 or 0 clears any preset IRQ. |
| 413 | */ |
| 414 | i = 0; |
| 415 | TAILQ_FOREACH(pci_link, &pci_links, pl_links) { |
| 416 | ksnprintf(tunable_buffer, sizeof(tunable_buffer), |
| 417 | "hw.pci.link.%#x.irq", pci_link->pl_id); |
| 418 | if (kgetenv_int(tunable_buffer, &irq) == 0) |
| 419 | continue; |
| 420 | if (irq == 0) |
| 421 | irq = PCI_INVALID_IRQ; |
| 422 | if (irq != PCI_INVALID_IRQ && |
| 423 | !pci_pir_valid_irq(pci_link, irq) && bootverbose) |
| 424 | kprintf( |
| 425 | "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n", |
| 426 | irq, pci_link->pl_id); |
| 427 | pci_link->pl_routed = 0; |
| 428 | pci_link->pl_irq = irq; |
| 429 | i = 1; |
| 430 | } |
| 431 | if (bootverbose && i) { |
| 432 | kprintf("$PIR: Links after tunable overrides:\n"); |
| 433 | pci_pir_dump_links(); |
| 434 | } |
| 435 | |
| 436 | /* |
| 437 | * Build initial interrupt weights as well as bitmap of "known-good" |
| 438 | * IRQs that the BIOS has already used for PCI link devices. |
| 439 | */ |
| 440 | TAILQ_FOREACH(pci_link, &pci_links, pl_links) { |
| 441 | if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) |
| 442 | continue; |
| 443 | pir_bios_irqs |= 1 << pci_link->pl_irq; |
| 444 | pir_interrupt_weight[pci_link->pl_irq] += |
| 445 | pci_link->pl_references; |
| 446 | } |
| 447 | if (bootverbose) { |
| 448 | kprintf("$PIR: IRQs used by BIOS: "); |
| 449 | pci_print_irqmask(pir_bios_irqs); |
| 450 | kprintf("\n"); |
| 451 | kprintf("$PIR: Interrupt Weights:\n[ "); |
| 452 | for (i = 0; i < NUM_ISA_INTERRUPTS; i++) |
| 453 | kprintf(" %3d", i); |
| 454 | kprintf(" ]\n[ "); |
| 455 | for (i = 0; i < NUM_ISA_INTERRUPTS; i++) |
| 456 | kprintf(" %3d", pir_interrupt_weight[i]); |
| 457 | kprintf(" ]\n"); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | /* |
| 462 | * Use the PCI BIOS to route an interrupt for a given device. |
| 463 | * |
| 464 | * Input: |
| 465 | * AX = PCIBIOS_ROUTE_INTERRUPT |
| 466 | * BH = bus |
| 467 | * BL = device [7:3] / function [2:0] |
| 468 | * CH = IRQ |
| 469 | * CL = Interrupt Pin (0x0A = A, ... 0x0D = D) |
| 470 | */ |
| 471 | static int |
| 472 | pci_pir_biosroute(int bus, int device, int func, int pin, int irq) |
| 473 | { |
| 474 | struct bios_regs args; |
| 475 | |
| 476 | args.eax = PCIBIOS_ROUTE_INTERRUPT; |
| 477 | args.ebx = (bus << 8) | (device << 3) | func; |
| 478 | args.ecx = (irq << 8) | (0xa + pin); |
| 479 | return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL))); |
| 480 | } |
| 481 | |
| 482 | |
| 483 | /* |
| 484 | * Route a PCI interrupt using a link device from the $PIR. |
| 485 | */ |
| 486 | int |
| 487 | pci_pir_route_interrupt(int bus, int device, int func, int pin) |
| 488 | { |
| 489 | struct pci_link_lookup lookup; |
| 490 | struct pci_link *pci_link; |
| 491 | int error, irq; |
| 492 | |
| 493 | if (pci_route_table == NULL) |
| 494 | return (PCI_INVALID_IRQ); |
| 495 | |
| 496 | /* Lookup link device for this PCI device/pin. */ |
| 497 | pci_link = NULL; |
| 498 | lookup.bus = bus; |
| 499 | lookup.device = device; |
| 500 | lookup.pin = pin - 1; |
| 501 | lookup.pci_link_ptr = &pci_link; |
| 502 | pci_pir_walk_table(pci_pir_find_link_handler, &lookup); |
| 503 | if (pci_link == NULL) { |
| 504 | kprintf("$PIR: No matching entry for %d.%d.INT%c\n", bus, |
| 505 | device, pin - 1 + 'A'); |
| 506 | return (PCI_INVALID_IRQ); |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Pick a new interrupt if we don't have one already. We look |
| 511 | * for an interrupt from several different sets. First, if |
| 512 | * this link only has one valid IRQ, use that. Second, we |
| 513 | * check the set of PCI only interrupts from the $PIR. Third, |
| 514 | * we check the set of known-good interrupts that the BIOS has |
| 515 | * already used. Lastly, we check the "all possible valid |
| 516 | * IRQs" set. |
| 517 | */ |
| 518 | if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { |
| 519 | if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask)) |
| 520 | irq = ffs(pci_link->pl_irqmask) - 1; |
| 521 | else |
| 522 | irq = pci_pir_choose_irq(pci_link, |
| 523 | pci_route_table->pt_header.ph_pci_irqs); |
| 524 | if (!PCI_INTERRUPT_VALID(irq)) |
| 525 | irq = pci_pir_choose_irq(pci_link, pir_bios_irqs); |
| 526 | if (!PCI_INTERRUPT_VALID(irq)) |
| 527 | irq = pci_pir_choose_irq(pci_link, |
| 528 | pci_irq_override_mask); |
| 529 | if (!PCI_INTERRUPT_VALID(irq)) { |
| 530 | if (bootverbose) |
| 531 | kprintf( |
| 532 | "$PIR: Failed to route interrupt for %d:%d INT%c\n", |
| 533 | bus, device, pin - 1 + 'A'); |
| 534 | return (PCI_INVALID_IRQ); |
| 535 | } |
| 536 | pci_link->pl_irq = irq; |
| 537 | } |
| 538 | |
| 539 | /* Ask the BIOS to route this IRQ if we haven't done so already. */ |
| 540 | if (!pci_link->pl_routed) { |
| 541 | if (machintr_legacy_intr_find(pci_link->pl_irq, |
| 542 | INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW) < 0) { |
| 543 | kprintf("$PIR: can't find irq %d\n", pci_link->pl_irq); |
| 544 | return PCI_INVALID_IRQ; |
| 545 | } |
| 546 | |
| 547 | error = pci_pir_biosroute(bus, device, func, pin - 1, |
| 548 | pci_link->pl_irq); |
| 549 | |
| 550 | /* Ignore errors when routing a unique interrupt. */ |
| 551 | if (error && !powerof2(pci_link->pl_irqmask)) { |
| 552 | kprintf("$PIR: ROUTE_INTERRUPT failed.\n"); |
| 553 | return (PCI_INVALID_IRQ); |
| 554 | } |
| 555 | pci_link->pl_routed = 1; |
| 556 | |
| 557 | /* Ensure the interrupt is set to level/low trigger. */ |
| 558 | KASSERT(pir_device != NULL, ("missing pir device")); |
| 559 | BUS_CONFIG_INTR(pir_device, pir_device, pci_link->pl_irq, |
| 560 | INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); |
| 561 | } |
| 562 | if (bootverbose) |
| 563 | kprintf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device, |
| 564 | pin - 1 + 'A', pci_link->pl_irq); |
| 565 | return (pci_link->pl_irq); |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Try to pick an interrupt for the specified link from the interrupts |
| 570 | * set in the mask. |
| 571 | */ |
| 572 | static int |
| 573 | pci_pir_choose_irq(struct pci_link *pci_link, int irqmask) |
| 574 | { |
| 575 | int i, irq, realmask; |
| 576 | |
| 577 | /* XXX: Need to have a #define of known bad IRQs to also mask out? */ |
| 578 | realmask = pci_link->pl_irqmask & irqmask; |
| 579 | if (realmask == 0) |
| 580 | return (PCI_INVALID_IRQ); |
| 581 | |
| 582 | /* Find IRQ with lowest weight. */ |
| 583 | irq = PCI_INVALID_IRQ; |
| 584 | for (i = 0; i < NUM_ISA_INTERRUPTS; i++) { |
| 585 | if (!(realmask & 1 << i)) |
| 586 | continue; |
| 587 | if (irq == PCI_INVALID_IRQ || |
| 588 | pir_interrupt_weight[i] < pir_interrupt_weight[irq]) |
| 589 | irq = i; |
| 590 | } |
| 591 | if (bootverbose && PCI_INTERRUPT_VALID(irq)) { |
| 592 | kprintf("$PIR: Found IRQ %d for link %#x from ", irq, |
| 593 | pci_link->pl_id); |
| 594 | pci_print_irqmask(realmask); |
| 595 | kprintf("\n"); |
| 596 | } |
| 597 | return (irq); |
| 598 | } |
| 599 | |
| 600 | static void |
| 601 | pci_print_irqmask(u_int16_t irqs) |
| 602 | { |
| 603 | int i, first; |
| 604 | |
| 605 | if (irqs == 0) { |
| 606 | kprintf("none"); |
| 607 | return; |
| 608 | } |
| 609 | first = 1; |
| 610 | for (i = 0; i < 16; i++, irqs >>= 1) |
| 611 | if (irqs & 1) { |
| 612 | if (!first) |
| 613 | kprintf(" "); |
| 614 | else |
| 615 | first = 0; |
| 616 | kprintf("%d", i); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* |
| 621 | * Display link devices. |
| 622 | */ |
| 623 | static void |
| 624 | pci_pir_dump_links(void) |
| 625 | { |
| 626 | struct pci_link *pci_link; |
| 627 | |
| 628 | kprintf("Link IRQ Rtd Ref IRQs\n"); |
| 629 | TAILQ_FOREACH(pci_link, &pci_links, pl_links) { |
| 630 | kprintf("%#4x %3d %c %3d ", pci_link->pl_id, |
| 631 | pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N', |
| 632 | pci_link->pl_references); |
| 633 | pci_print_irqmask(pci_link->pl_irqmask); |
| 634 | kprintf("\n"); |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * See if any interrupts for a given PCI bus are routed in the PIR. Don't |
| 640 | * even bother looking if the BIOS doesn't support routing anyways. If we |
| 641 | * are probing a PCI-PCI bridge, then require_parse will be true and we should |
| 642 | * only succeed if a host-PCI bridge has already attached and parsed the PIR. |
| 643 | */ |
| 644 | int |
| 645 | pci_pir_probe(int bus, int require_parse) |
| 646 | { |
| 647 | int i; |
| 648 | if (pci_route_table == NULL || (require_parse && !pir_parsed)) |
| 649 | return (0); |
| 650 | for (i = 0; i < pci_route_count; i++) |
| 651 | if (pci_route_table->pt_entry[i].pe_bus == bus) |
| 652 | return (1); |
| 653 | return (0); |
| 654 | } |
| 655 | |
| 656 | /* |
| 657 | * The driver for the new-bus psuedo device pir0 for the $PIR table. |
| 658 | */ |
| 659 | |
| 660 | static int |
| 661 | pir_probe(device_t dev) |
| 662 | { |
| 663 | char buf[64]; |
| 664 | |
| 665 | ksnprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries", |
| 666 | pci_route_count); |
| 667 | device_set_desc_copy(dev, buf); |
| 668 | return (0); |
| 669 | } |
| 670 | |
| 671 | static int |
| 672 | pir_attach(device_t dev) |
| 673 | { |
| 674 | |
| 675 | pci_pir_parse(); |
| 676 | KASSERT(pir_device == NULL, ("Multiple pir devices")); |
| 677 | pir_device = dev; |
| 678 | return (0); |
| 679 | } |
| 680 | |
| 681 | static void |
| 682 | pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin, |
| 683 | void *arg) |
| 684 | { |
| 685 | struct pci_dev_lookup *pd; |
| 686 | |
| 687 | pd = (struct pci_dev_lookup *)arg; |
| 688 | if (intpin->link != pd->link || pd->bus != -1) |
| 689 | return; |
| 690 | pd->bus = entry->pe_bus; |
| 691 | pd->device = entry->pe_device; |
| 692 | pd->pin = intpin - entry->pe_intpin; |
| 693 | } |
| 694 | |
| 695 | static int |
| 696 | pir_resume(device_t dev) |
| 697 | { |
| 698 | struct pci_dev_lookup pd; |
| 699 | struct pci_link *pci_link; |
| 700 | int error; |
| 701 | |
| 702 | /* Ask the BIOS to re-route each link that was already routed. */ |
| 703 | TAILQ_FOREACH(pci_link, &pci_links, pl_links) { |
| 704 | if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) { |
| 705 | KASSERT(!pci_link->pl_routed, |
| 706 | ("link %#x is routed but has invalid PCI IRQ", |
| 707 | pci_link->pl_id)); |
| 708 | continue; |
| 709 | } |
| 710 | if (pci_link->pl_routed) { |
| 711 | pd.bus = -1; |
| 712 | pd.link = pci_link->pl_id; |
| 713 | pci_pir_walk_table(pir_resume_find_device, &pd); |
| 714 | KASSERT(pd.bus != -1, |
| 715 | ("did not find matching entry for link %#x in the $PIR table", |
| 716 | pci_link->pl_id)); |
| 717 | if (bootverbose) |
| 718 | device_printf(dev, |
| 719 | "Using %d.%d.INT%c to route link %#x to IRQ %d\n", |
| 720 | pd.bus, pd.device, pd.pin + 'A', |
| 721 | pci_link->pl_id, pci_link->pl_irq); |
| 722 | error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin, |
| 723 | pci_link->pl_irq); |
| 724 | if (error) |
| 725 | device_printf(dev, |
| 726 | "ROUTE_INTERRUPT on resume for link %#x failed.\n", |
| 727 | pci_link->pl_id); |
| 728 | } |
| 729 | } |
| 730 | return (0); |
| 731 | } |
| 732 | |
| 733 | static device_method_t pir_methods[] = { |
| 734 | /* Device interface */ |
| 735 | DEVMETHOD(device_probe, pir_probe), |
| 736 | DEVMETHOD(device_attach, pir_attach), |
| 737 | DEVMETHOD(device_resume, pir_resume), |
| 738 | |
| 739 | { 0, 0 } |
| 740 | }; |
| 741 | |
| 742 | static driver_t pir_driver = { |
| 743 | "pir", |
| 744 | pir_methods, |
| 745 | 1, |
| 746 | }; |
| 747 | |
| 748 | static devclass_t pir_devclass; |
| 749 | |
| 750 | DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, NULL, NULL); |