FreeBSD/Linux Kernel Cross Reference
sys/i386/pci/pci_pir.c
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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/bus.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/sysctl.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 <dev/pci/pcivar.h>
45 #include <dev/pci/pcireg.h>
46 #include <machine/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 void pci_pir_print_intpin(struct PIR_entry *entry,
96 struct PIR_intpin *intpin, void *arg);
97 static void pci_pir_print_table(void);
98 static uint8_t pci_pir_search_irq(int bus, int device, int pin);
99 static int pci_pir_valid_irq(struct pci_link *pci_link, int irq);
100 static void pci_pir_walk_table(pir_entry_handler *handler, void *arg);
101
102 MALLOC_DEFINE(M_PIR, "$PIR", "$PIR structures");
103
104 static struct PIR_table *pci_route_table;
105 static device_t pir_device;
106 static int pci_route_count, pir_bios_irqs, pir_parsed;
107 static TAILQ_HEAD(, pci_link) pci_links;
108 static int pir_interrupt_weight[NUM_ISA_INTERRUPTS];
109
110 /* sysctl vars */
111 SYSCTL_DECL(_hw_pci);
112
113 #ifdef PC98
114 /* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */
115 #define PCI_IRQ_OVERRIDE_MASK 0x3e68
116 #else
117 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */
118 #define PCI_IRQ_OVERRIDE_MASK 0xdef8
119 #endif
120
121 static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK;
122 TUNABLE_INT("hw.pci.irq_override_mask", &pci_irq_override_mask);
123 SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN,
124 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK,
125 "Mask of allowed irqs to try to route when it has no good clue about\n"
126 "which irqs it should use.");
127
128 /*
129 * Look for the interrupt routing table.
130 *
131 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way
132 * to do this. Sadly, some machines are not standards conforming and have
133 * _PIR instead. We shrug and cope by looking for both.
134 */
135 void
136 pci_pir_open(void)
137 {
138 struct PIR_table *pt;
139 uint32_t sigaddr;
140 int i;
141 uint8_t ck, *cv;
142
143 /* Don't try if we've already found a table. */
144 if (pci_route_table != NULL)
145 return;
146
147 /* Look for $PIR and then _PIR. */
148 sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0);
149 if (sigaddr == 0)
150 sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0);
151 if (sigaddr == 0)
152 return;
153
154 /* If we found something, check the checksum and length. */
155 /* XXX - Use pmap_mapdev()? */
156 pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
157 if (pt->pt_header.ph_length <= sizeof(struct PIR_header))
158 return;
159 for (cv = (u_int8_t *)pt, ck = 0, i = 0;
160 i < (pt->pt_header.ph_length); i++)
161 ck += cv[i];
162 if (ck != 0)
163 return;
164
165 /* Ok, we've got a valid table. */
166 pci_route_table = pt;
167 pci_route_count = (pt->pt_header.ph_length -
168 sizeof(struct PIR_header)) /
169 sizeof(struct PIR_entry);
170 if (bootverbose) {
171 printf("Found $PIR table, %d entries at %p\n",
172 pci_route_count, pci_route_table);
173 pci_pir_print_table();
174 }
175 }
176
177 /*
178 * Find the pci_link structure for a given link ID.
179 */
180 static struct pci_link *
181 pci_pir_find_link(uint8_t link_id)
182 {
183 struct pci_link *pci_link;
184
185 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
186 if (pci_link->pl_id == link_id)
187 return (pci_link);
188 }
189 return (NULL);
190 }
191
192 /*
193 * Find the link device associated with a PCI device in the table.
194 */
195 static void
196 pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin,
197 void *arg)
198 {
199 struct pci_link_lookup *lookup;
200
201 lookup = (struct pci_link_lookup *)arg;
202 if (entry->pe_bus == lookup->bus &&
203 entry->pe_device == lookup->device &&
204 intpin - entry->pe_intpin == lookup->pin)
205 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link);
206 }
207
208 /*
209 * Check to see if a possible IRQ setting is valid.
210 */
211 static int
212 pci_pir_valid_irq(struct pci_link *pci_link, int irq)
213 {
214
215 if (!PCI_INTERRUPT_VALID(irq))
216 return (0);
217 return (pci_link->pl_irqmask & (1 << irq));
218 }
219
220 /*
221 * Walk the $PIR executing the worker function for each valid intpin entry
222 * in the table. The handler is passed a pointer to both the entry and
223 * the intpin in the entry.
224 */
225 static void
226 pci_pir_walk_table(pir_entry_handler *handler, void *arg)
227 {
228 struct PIR_entry *entry;
229 struct PIR_intpin *intpin;
230 int i, pin;
231
232 entry = &pci_route_table->pt_entry[0];
233 for (i = 0; i < pci_route_count; i++, entry++) {
234 intpin = &entry->pe_intpin[0];
235 for (pin = 0; pin < 4; pin++, intpin++)
236 if (intpin->link != 0)
237 handler(entry, intpin, arg);
238 }
239 }
240
241 static void
242 pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin,
243 void *arg)
244 {
245 struct pci_link *pci_link;
246
247 pci_link = pci_pir_find_link(intpin->link);
248 if (pci_link != NULL) {
249 pci_link->pl_references++;
250 if (intpin->irqs != pci_link->pl_irqmask) {
251 if (bootverbose)
252 printf(
253 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n",
254 entry->pe_bus, entry->pe_device,
255 (intpin - entry->pe_intpin) + 'A',
256 pci_link->pl_id);
257 pci_link->pl_irqmask &= intpin->irqs;
258 }
259 } else {
260 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK);
261 pci_link->pl_id = intpin->link;
262 pci_link->pl_irqmask = intpin->irqs;
263 pci_link->pl_irq = PCI_INVALID_IRQ;
264 pci_link->pl_references = 1;
265 pci_link->pl_routed = 0;
266 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links);
267 }
268 }
269
270 /*
271 * Look to see if any of the function on the PCI device at bus/device have
272 * an interrupt routed to intpin 'pin' by the BIOS.
273 */
274 static uint8_t
275 pci_pir_search_irq(int bus, int device, int pin)
276 {
277 uint32_t value;
278 uint8_t func, maxfunc;
279
280 /* See if we have a valid device at function 0. */
281 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
282 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
283 return (PCI_INVALID_IRQ);
284 if (value & PCIM_MFDEV)
285 maxfunc = PCI_FUNCMAX;
286 else
287 maxfunc = 0;
288
289 /* Scan all possible functions at this device. */
290 for (func = 0; func <= maxfunc; func++) {
291 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
292 if (value == 0xffffffff)
293 continue;
294 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
295
296 /*
297 * See if it uses the pin in question. Note that the passed
298 * in pin uses 0 for A, .. 3 for D whereas the intpin
299 * register uses 0 for no interrupt, 1 for A, .. 4 for D.
300 */
301 if (value != pin + 1)
302 continue;
303 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
304 if (bootverbose)
305 printf(
306 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n",
307 bus, device, pin + 'A', func, value);
308 if (value != PCI_INVALID_IRQ)
309 return (value);
310 }
311 return (PCI_INVALID_IRQ);
312 }
313
314 /*
315 * Try to initialize IRQ based on this device's IRQ.
316 */
317 static void
318 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin,
319 void *arg)
320 {
321 struct pci_link *pci_link;
322 uint8_t irq, pin;
323
324 pin = intpin - entry->pe_intpin;
325 pci_link = pci_pir_find_link(intpin->link);
326 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin);
327 if (irq == PCI_INVALID_IRQ)
328 return;
329 if (pci_pir_valid_irq(pci_link, irq)) {
330 if (pci_link->pl_irq == PCI_INVALID_IRQ) {
331 pci_link->pl_irq = irq;
332 pci_link->pl_routed = 1;
333 } else if (pci_link->pl_irq != irq)
334 printf(
335 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n",
336 irq, entry->pe_bus, entry->pe_device, pin + 'A',
337 pci_link->pl_id, pci_link->pl_irq);
338 } else
339 printf(
340 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n",
341 irq, entry->pe_bus, entry->pe_device, pin + 'A',
342 pci_link->pl_id);
343 }
344
345 /*
346 * Parse $PIR to enumerate link devices and attempt to determine their
347 * initial state. This could perhaps be cleaner if we had drivers for the
348 * various interrupt routers as they could read the initial IRQ for each
349 * link.
350 */
351 static void
352 pci_pir_parse(void)
353 {
354 char tunable_buffer[64];
355 struct pci_link *pci_link;
356 int i, irq;
357
358 /* Only parse once. */
359 if (pir_parsed)
360 return;
361 pir_parsed = 1;
362
363 /* Enumerate link devices. */
364 TAILQ_INIT(&pci_links);
365 pci_pir_walk_table(pci_pir_create_links, NULL);
366 if (bootverbose) {
367 printf("$PIR: Links after initial probe:\n");
368 pci_pir_dump_links();
369 }
370
371 /* Check for unique IRQ masks. */
372 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
373 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask))
374 pci_link->pl_irq = ffs(pci_link->pl_irqmask) - 1;
375 }
376
377 /*
378 * Check to see if the BIOS has already routed any of the links by
379 * checking each device connected to each link to see if it has a
380 * valid IRQ.
381 */
382 pci_pir_walk_table(pci_pir_initial_irqs, NULL);
383 if (bootverbose) {
384 printf("$PIR: Links after initial IRQ discovery:\n");
385 pci_pir_dump_links();
386 }
387
388 /*
389 * Allow the user to override the IRQ for a given link device as
390 * long as the override is valid or is 255 or 0 to clear a preset
391 * IRQ.
392 */
393 i = 0;
394 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
395 snprintf(tunable_buffer, sizeof(tunable_buffer),
396 "hw.pci.link.%#x.irq", pci_link->pl_id);
397 if (getenv_int(tunable_buffer, &irq) == 0)
398 continue;
399 if (irq == 0)
400 irq = PCI_INVALID_IRQ;
401 if (irq == PCI_INVALID_IRQ ||
402 pci_pir_valid_irq(pci_link, irq)) {
403 pci_link->pl_routed = 0;
404 pci_link->pl_irq = irq;
405 i = 1;
406 }
407 }
408 if (bootverbose && i) {
409 printf("$PIR: Links after tunable overrides:\n");
410 pci_pir_dump_links();
411 }
412
413 /*
414 * Build initial interrupt weights as well as bitmap of "known-good"
415 * IRQs that the BIOS has already used for PCI link devices.
416 */
417 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
418 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq))
419 continue;
420 pir_bios_irqs |= 1 << pci_link->pl_irq;
421 pir_interrupt_weight[pci_link->pl_irq] +=
422 pci_link->pl_references;
423 }
424 if (bootverbose) {
425 printf("$PIR: IRQs used by BIOS: ");
426 pci_print_irqmask(pir_bios_irqs);
427 printf("\n");
428 printf("$PIR: Interrupt Weights:\n[ ");
429 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
430 printf(" %3d", i);
431 printf(" ]\n[ ");
432 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
433 printf(" %3d", pir_interrupt_weight[i]);
434 printf(" ]\n");
435 }
436 }
437
438 /*
439 * Use the PCI BIOS to route an interrupt for a given device.
440 *
441 * Input:
442 * AX = PCIBIOS_ROUTE_INTERRUPT
443 * BH = bus
444 * BL = device [7:3] / function [2:0]
445 * CH = IRQ
446 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D)
447 */
448 static int
449 pci_pir_biosroute(int bus, int device, int func, int pin, int irq)
450 {
451 struct bios_regs args;
452
453 args.eax = PCIBIOS_ROUTE_INTERRUPT;
454 args.ebx = (bus << 8) | (device << 3) | func;
455 args.ecx = (irq << 8) | (0xa + pin);
456 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)));
457 }
458
459
460 /*
461 * Route a PCI interrupt using a link device from the $PIR.
462 */
463 int
464 pci_pir_route_interrupt(int bus, int device, int func, int pin)
465 {
466 struct pci_link_lookup lookup;
467 struct pci_link *pci_link;
468 int error, irq;
469
470 if (pci_route_table == NULL)
471 return (PCI_INVALID_IRQ);
472
473 /* Lookup link device for this PCI device/pin. */
474 pci_link = NULL;
475 lookup.bus = bus;
476 lookup.device = device;
477 lookup.pin = pin - 1;
478 lookup.pci_link_ptr = &pci_link;
479 pci_pir_walk_table(pci_pir_find_link_handler, &lookup);
480 if (pci_link == NULL) {
481 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus,
482 device, pin - 1 + 'A');
483 return (PCI_INVALID_IRQ);
484 }
485
486 /*
487 * Pick a new interrupt if we don't have one already. We look for
488 * an interrupt from several different sets. First, we check the
489 * set of PCI only interrupts from the $PIR. Second, we check the
490 * set of known-good interrupts that the BIOS has already used.
491 * Lastly, we check the "all possible valid IRQs" set.
492 */
493 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
494 irq = pci_pir_choose_irq(pci_link,
495 pci_route_table->pt_header.ph_pci_irqs);
496 if (!PCI_INTERRUPT_VALID(irq))
497 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs);
498 if (!PCI_INTERRUPT_VALID(irq))
499 irq = pci_pir_choose_irq(pci_link,
500 pci_irq_override_mask);
501 if (!PCI_INTERRUPT_VALID(irq)) {
502 if (bootverbose)
503 printf(
504 "$PIR: Failed to route interrupt for %d:%d INT%c\n",
505 bus, device, pin - 1 + 'A');
506 return (PCI_INVALID_IRQ);
507 }
508 pci_link->pl_irq = irq;
509 }
510
511 /* Ask the BIOS to route this IRQ if we haven't done so already. */
512 if (!pci_link->pl_routed) {
513 error = pci_pir_biosroute(bus, device, func, pin - 1,
514 pci_link->pl_irq);
515
516 /* Ignore errors when routing a unique interrupt. */
517 if (error && !powerof2(pci_link->pl_irqmask)) {
518 printf("$PIR: ROUTE_INTERRUPT failed.\n");
519 return (PCI_INVALID_IRQ);
520 }
521 pci_link->pl_routed = 1;
522
523 /* Ensure the interrupt is set to level/low trigger. */
524 KASSERT(pir_device != NULL, ("missing pir device"));
525 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq,
526 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
527 }
528 if (bootverbose)
529 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device,
530 pin - 1 + 'A', pci_link->pl_irq);
531 return (pci_link->pl_irq);
532 }
533
534 /*
535 * Try to pick an interrupt for the specified link from the interrupts
536 * set in the mask.
537 */
538 static int
539 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask)
540 {
541 int i, irq, realmask;
542
543 /* XXX: Need to have a #define of known bad IRQs to also mask out? */
544 realmask = pci_link->pl_irqmask & irqmask;
545 if (realmask == 0)
546 return (PCI_INVALID_IRQ);
547
548 /* Find IRQ with lowest weight. */
549 irq = PCI_INVALID_IRQ;
550 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) {
551 if (!(realmask & 1 << i))
552 continue;
553 if (irq == PCI_INVALID_IRQ ||
554 pir_interrupt_weight[i] < pir_interrupt_weight[irq])
555 irq = i;
556 }
557 if (bootverbose && PCI_INTERRUPT_VALID(irq)) {
558 printf("$PIR: Found IRQ %d for link %#x from ", irq,
559 pci_link->pl_id);
560 pci_print_irqmask(realmask);
561 printf("\n");
562 }
563 return (irq);
564 }
565
566 static void
567 pci_print_irqmask(u_int16_t irqs)
568 {
569 int i, first;
570
571 if (irqs == 0) {
572 printf("none");
573 return;
574 }
575 first = 1;
576 for (i = 0; i < 16; i++, irqs >>= 1)
577 if (irqs & 1) {
578 if (!first)
579 printf(" ");
580 else
581 first = 0;
582 printf("%d", i);
583 }
584 }
585
586 /*
587 * Dump the contents of a single intpin entry to the console.
588 */
589 static void
590 pci_pir_print_intpin(struct PIR_entry *entry, struct PIR_intpin *intpin,
591 void *arg)
592 {
593
594 if (entry->pe_slot == 0)
595 printf("embedded ");
596 else
597 printf("slot %-3d ", entry->pe_slot);
598 printf(" %3d %3d %c 0x%02x ", entry->pe_bus, entry->pe_device,
599 intpin - entry->pe_intpin + 'A', intpin->link);
600 pci_print_irqmask(intpin->irqs);
601 printf("\n");
602 }
603
604 /*
605 * Dump the contents of a PCI BIOS Interrupt Routing Table to the console.
606 */
607 static void
608 pci_pir_print_table(void)
609 {
610
611 printf("PCI-Only Interrupts: ");
612 pci_print_irqmask(pci_route_table->pt_header.ph_pci_irqs);
613 printf("\nLocation Bus Device Pin Link IRQs\n");
614 pci_pir_walk_table(pci_pir_print_intpin, NULL);
615 }
616
617 /*
618 * Display link devices.
619 */
620 static void
621 pci_pir_dump_links(void)
622 {
623 struct pci_link *pci_link;
624
625 printf("Link IRQ Rtd Ref IRQs\n");
626 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
627 printf("%#4x %3d %c %3d ", pci_link->pl_id,
628 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N',
629 pci_link->pl_references);
630 pci_print_irqmask(pci_link->pl_irqmask);
631 printf("\n");
632 }
633 }
634
635 /*
636 * See if any interrupts for a given PCI bus are routed in the PIR. Don't
637 * even bother looking if the BIOS doesn't support routing anyways. If we
638 * are probing a PCI-PCI bridge, then require_parse will be true and we should
639 * only succeed if a host-PCI bridge has already attached and parsed the PIR.
640 */
641 int
642 pci_pir_probe(int bus, int require_parse)
643 {
644 int i;
645
646 if (pci_route_table == NULL || (require_parse && !pir_parsed))
647 return (0);
648 for (i = 0; i < pci_route_count; i++)
649 if (pci_route_table->pt_entry[i].pe_bus == bus)
650 return (1);
651 return (0);
652 }
653
654 /*
655 * The driver for the new-bus psuedo device pir0 for the $PIR table.
656 */
657
658 static int
659 pir_probe(device_t dev)
660 {
661 char buf[64];
662
663 snprintf(buf, sizeof(buf), "PCI Interrupt Routing Table: %d Entries",
664 pci_route_count);
665 device_set_desc_copy(dev, buf);
666 return (0);
667 }
668
669 static int
670 pir_attach(device_t dev)
671 {
672
673 pci_pir_parse();
674 KASSERT(pir_device == NULL, ("Multiple pir devices"));
675 pir_device = dev;
676 return (0);
677 }
678
679 static void
680 pir_resume_find_device(struct PIR_entry *entry, struct PIR_intpin *intpin,
681 void *arg)
682 {
683 struct pci_dev_lookup *pd;
684
685 pd = (struct pci_dev_lookup *)arg;
686 if (intpin->link != pd->link || pd->bus != -1)
687 return;
688 pd->bus = entry->pe_bus;
689 pd->device = entry->pe_device;
690 pd->pin = intpin - entry->pe_intpin;
691 }
692
693 static int
694 pir_resume(device_t dev)
695 {
696 struct pci_dev_lookup pd;
697 struct pci_link *pci_link;
698 int error;
699
700 /* Ask the BIOS to re-route each link that was already routed. */
701 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
702 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
703 KASSERT(!pci_link->pl_routed,
704 ("link %#x is routed but has invalid PCI IRQ",
705 pci_link->pl_id));
706 continue;
707 }
708 if (pci_link->pl_routed) {
709 pd.bus = -1;
710 pd.link = pci_link->pl_id;
711 pci_pir_walk_table(pir_resume_find_device, &pd);
712 KASSERT(pd.bus != -1,
713 ("did not find matching entry for link %#x in the $PIR table",
714 pci_link->pl_id));
715 if (bootverbose)
716 device_printf(dev,
717 "Using %d.%d.INT%c to route link %#x to IRQ %d\n",
718 pd.bus, pd.device, pd.pin + 'A',
719 pci_link->pl_id, pci_link->pl_irq);
720 error = pci_pir_biosroute(pd.bus, pd.device, 0, pd.pin,
721 pci_link->pl_irq);
722 if (error)
723 device_printf(dev,
724 "ROUTE_INTERRUPT on resume for link %#x failed.\n",
725 pci_link->pl_id);
726 }
727 }
728 return (0);
729 }
730
731 static device_method_t pir_methods[] = {
732 /* Device interface */
733 DEVMETHOD(device_probe, pir_probe),
734 DEVMETHOD(device_attach, pir_attach),
735 DEVMETHOD(device_resume, pir_resume),
736
737 { 0, 0 }
738 };
739
740 static driver_t pir_driver = {
741 "pir",
742 pir_methods,
743 1,
744 };
745
746 static devclass_t pir_devclass;
747
748 DRIVER_MODULE(pir, legacy, pir_driver, pir_devclass, 0, 0);
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