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: releng/6.3/sys/i386/pci/pci_pir.c 164454 2006-11-20 22:47:00Z jhb $");
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 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 #ifdef PC98
111 /* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */
112 #define PCI_IRQ_OVERRIDE_MASK 0x3e68
113 #else
114 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */
115 #define PCI_IRQ_OVERRIDE_MASK 0xdef8
116 #endif
117
118 static uint32_t pci_irq_override_mask = PCI_IRQ_OVERRIDE_MASK;
119 TUNABLE_INT("hw.pci.irq_override_mask", &pci_irq_override_mask);
120 SYSCTL_INT(_hw_pci, OID_AUTO, irq_override_mask, CTLFLAG_RDTUN,
121 &pci_irq_override_mask, PCI_IRQ_OVERRIDE_MASK,
122 "Mask of allowed irqs to try to route when it has no good clue about\n"
123 "which irqs it should use.");
124
125 /*
126 * Look for the interrupt routing table.
127 *
128 * We use PCI BIOS's PIR table if it's available. $PIR is the standard way
129 * to do this. Sadly, some machines are not standards conforming and have
130 * _PIR instead. We shrug and cope by looking for both.
131 */
132 void
133 pci_pir_open(void)
134 {
135 struct PIR_table *pt;
136 uint32_t sigaddr;
137 int i;
138 uint8_t ck, *cv;
139
140 /* Don't try if we've already found a table. */
141 if (pci_route_table != NULL)
142 return;
143
144 /* Look for $PIR and then _PIR. */
145 sigaddr = bios_sigsearch(0, "$PIR", 4, 16, 0);
146 if (sigaddr == 0)
147 sigaddr = bios_sigsearch(0, "_PIR", 4, 16, 0);
148 if (sigaddr == 0)
149 return;
150
151 /* If we found something, check the checksum and length. */
152 /* XXX - Use pmap_mapdev()? */
153 pt = (struct PIR_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr);
154 if (pt->pt_header.ph_length <= sizeof(struct PIR_header))
155 return;
156 for (cv = (u_int8_t *)pt, ck = 0, i = 0;
157 i < (pt->pt_header.ph_length); i++)
158 ck += cv[i];
159 if (ck != 0)
160 return;
161
162 /* Ok, we've got a valid table. */
163 pci_route_table = pt;
164 pci_route_count = (pt->pt_header.ph_length -
165 sizeof(struct PIR_header)) /
166 sizeof(struct PIR_entry);
167 }
168
169 /*
170 * Find the pci_link structure for a given link ID.
171 */
172 static struct pci_link *
173 pci_pir_find_link(uint8_t link_id)
174 {
175 struct pci_link *pci_link;
176
177 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
178 if (pci_link->pl_id == link_id)
179 return (pci_link);
180 }
181 return (NULL);
182 }
183
184 /*
185 * Find the link device associated with a PCI device in the table.
186 */
187 static void
188 pci_pir_find_link_handler(struct PIR_entry *entry, struct PIR_intpin *intpin,
189 void *arg)
190 {
191 struct pci_link_lookup *lookup;
192
193 lookup = (struct pci_link_lookup *)arg;
194 if (entry->pe_bus == lookup->bus &&
195 entry->pe_device == lookup->device &&
196 intpin - entry->pe_intpin == lookup->pin)
197 *lookup->pci_link_ptr = pci_pir_find_link(intpin->link);
198 }
199
200 /*
201 * Check to see if a possible IRQ setting is valid.
202 */
203 static int
204 pci_pir_valid_irq(struct pci_link *pci_link, int irq)
205 {
206
207 if (!PCI_INTERRUPT_VALID(irq))
208 return (0);
209 return (pci_link->pl_irqmask & (1 << irq));
210 }
211
212 /*
213 * Walk the $PIR executing the worker function for each valid intpin entry
214 * in the table. The handler is passed a pointer to both the entry and
215 * the intpin in the entry.
216 */
217 static void
218 pci_pir_walk_table(pir_entry_handler *handler, void *arg)
219 {
220 struct PIR_entry *entry;
221 struct PIR_intpin *intpin;
222 int i, pin;
223
224 entry = &pci_route_table->pt_entry[0];
225 for (i = 0; i < pci_route_count; i++, entry++) {
226 intpin = &entry->pe_intpin[0];
227 for (pin = 0; pin < 4; pin++, intpin++)
228 if (intpin->link != 0)
229 handler(entry, intpin, arg);
230 }
231 }
232
233 static void
234 pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin,
235 void *arg)
236 {
237 struct pci_link *pci_link;
238
239 pci_link = pci_pir_find_link(intpin->link);
240 if (pci_link != NULL) {
241 pci_link->pl_references++;
242 if (intpin->irqs != pci_link->pl_irqmask) {
243 if (bootverbose)
244 printf(
245 "$PIR: Entry %d.%d.INT%c has different mask for link %#x, merging\n",
246 entry->pe_bus, entry->pe_device,
247 (intpin - entry->pe_intpin) + 'A',
248 pci_link->pl_id);
249 pci_link->pl_irqmask &= intpin->irqs;
250 }
251 } else {
252 pci_link = malloc(sizeof(struct pci_link), M_PIR, M_WAITOK);
253 pci_link->pl_id = intpin->link;
254 pci_link->pl_irqmask = intpin->irqs;
255 pci_link->pl_irq = PCI_INVALID_IRQ;
256 pci_link->pl_references = 1;
257 pci_link->pl_routed = 0;
258 TAILQ_INSERT_TAIL(&pci_links, pci_link, pl_links);
259 }
260 }
261
262 /*
263 * Look to see if any of the function on the PCI device at bus/device have
264 * an interrupt routed to intpin 'pin' by the BIOS.
265 */
266 static uint8_t
267 pci_pir_search_irq(int bus, int device, int pin)
268 {
269 uint32_t value;
270 uint8_t func, maxfunc;
271
272 /* See if we have a valid device at function 0. */
273 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
274 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
275 return (PCI_INVALID_IRQ);
276 if (value & PCIM_MFDEV)
277 maxfunc = PCI_FUNCMAX;
278 else
279 maxfunc = 0;
280
281 /* Scan all possible functions at this device. */
282 for (func = 0; func <= maxfunc; func++) {
283 value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
284 if (value == 0xffffffff)
285 continue;
286 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
287
288 /*
289 * See if it uses the pin in question. Note that the passed
290 * in pin uses 0 for A, .. 3 for D whereas the intpin
291 * register uses 0 for no interrupt, 1 for A, .. 4 for D.
292 */
293 if (value != pin + 1)
294 continue;
295 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
296 if (bootverbose)
297 printf(
298 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n",
299 bus, device, pin + 'A', func, value);
300 if (value != PCI_INVALID_IRQ)
301 return (value);
302 }
303 return (PCI_INVALID_IRQ);
304 }
305
306 /*
307 * Try to initialize IRQ based on this device's IRQ.
308 */
309 static void
310 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin,
311 void *arg)
312 {
313 struct pci_link *pci_link;
314 uint8_t irq, pin;
315
316 pin = intpin - entry->pe_intpin;
317 pci_link = pci_pir_find_link(intpin->link);
318 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin);
319 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq)
320 return;
321
322 /* Don't trust any BIOS IRQs greater than 15. */
323 if (irq >= NUM_ISA_INTERRUPTS) {
324 printf(
325 "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
326 irq, entry->pe_bus, entry->pe_device, pin + 'A',
327 pci_link->pl_id);
328 return;
329 }
330
331 /*
332 * If we don't have an IRQ for this link yet, then we trust the
333 * BIOS, even if it seems invalid from the $PIR entries.
334 */
335 if (pci_link->pl_irq == PCI_INVALID_IRQ) {
336 if (!pci_pir_valid_irq(pci_link, irq))
337 printf(
338 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
339 irq, entry->pe_bus, entry->pe_device, pin + 'A',
340 pci_link->pl_id);
341 pci_link->pl_irq = irq;
342 pci_link->pl_routed = 1;
343 return;
344 }
345
346 /*
347 * We have an IRQ and it doesn't match the current IRQ for this
348 * link. If the new IRQ is invalid, then warn about it and ignore
349 * it. If the old IRQ is invalid and the new IRQ is valid, then
350 * prefer the new IRQ instead. If both IRQs are valid, then just
351 * use the first one. Note that if we ever get into this situation
352 * we are having to guess which setting the BIOS actually routed.
353 * Perhaps we should just give up instead.
354 */
355 if (!pci_pir_valid_irq(pci_link, irq)) {
356 printf(
357 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n",
358 irq, entry->pe_bus, entry->pe_device, pin + 'A',
359 pci_link->pl_id);
360 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) {
361 printf(
362 "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n",
363 irq, entry->pe_bus, entry->pe_device, pin + 'A',
364 pci_link->pl_id, pci_link->pl_irq);
365 pci_link->pl_irq = irq;
366 pci_link->pl_routed = 1;
367 } else
368 printf(
369 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n",
370 irq, entry->pe_bus, entry->pe_device, pin + 'A',
371 pci_link->pl_id, pci_link->pl_irq);
372 }
373
374 /*
375 * Parse $PIR to enumerate link devices and attempt to determine their
376 * initial state. This could perhaps be cleaner if we had drivers for the
377 * various interrupt routers as they could read the initial IRQ for each
378 * link.
379 */
380 static void
381 pci_pir_parse(void)
382 {
383 char tunable_buffer[64];
384 struct pci_link *pci_link;
385 int i, irq;
386
387 /* Only parse once. */
388 if (pir_parsed)
389 return;
390 pir_parsed = 1;
391
392 /* Enumerate link devices. */
393 TAILQ_INIT(&pci_links);
394 pci_pir_walk_table(pci_pir_create_links, NULL);
395 if (bootverbose) {
396 printf("$PIR: Links after initial probe:\n");
397 pci_pir_dump_links();
398 }
399
400 /* Check for unique IRQ masks. */
401 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
402 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask))
403 pci_link->pl_irq = ffs(pci_link->pl_irqmask) - 1;
404 }
405
406 /*
407 * Check to see if the BIOS has already routed any of the links by
408 * checking each device connected to each link to see if it has a
409 * valid IRQ.
410 */
411 pci_pir_walk_table(pci_pir_initial_irqs, NULL);
412 if (bootverbose) {
413 printf("$PIR: Links after initial IRQ discovery:\n");
414 pci_pir_dump_links();
415 }
416
417 /*
418 * Allow the user to override the IRQ for a given link device. We
419 * allow invalid IRQs to be specified but warn about them. An IRQ
420 * of 255 or 0 clears any preset IRQ.
421 */
422 i = 0;
423 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
424 snprintf(tunable_buffer, sizeof(tunable_buffer),
425 "hw.pci.link.%#x.irq", pci_link->pl_id);
426 if (getenv_int(tunable_buffer, &irq) == 0)
427 continue;
428 if (irq == 0)
429 irq = PCI_INVALID_IRQ;
430 if (irq != PCI_INVALID_IRQ &&
431 !pci_pir_valid_irq(pci_link, irq) && bootverbose)
432 printf(
433 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n",
434 irq, pci_link->pl_id);
435 pci_link->pl_routed = 0;
436 pci_link->pl_irq = irq;
437 i = 1;
438 }
439 if (bootverbose && i) {
440 printf("$PIR: Links after tunable overrides:\n");
441 pci_pir_dump_links();
442 }
443
444 /*
445 * Build initial interrupt weights as well as bitmap of "known-good"
446 * IRQs that the BIOS has already used for PCI link devices.
447 */
448 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
449 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq))
450 continue;
451 pir_bios_irqs |= 1 << pci_link->pl_irq;
452 pir_interrupt_weight[pci_link->pl_irq] +=
453 pci_link->pl_references;
454 }
455 if (bootverbose) {
456 printf("$PIR: IRQs used by BIOS: ");
457 pci_print_irqmask(pir_bios_irqs);
458 printf("\n");
459 printf("$PIR: Interrupt Weights:\n[ ");
460 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
461 printf(" %3d", i);
462 printf(" ]\n[ ");
463 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
464 printf(" %3d", pir_interrupt_weight[i]);
465 printf(" ]\n");
466 }
467 }
468
469 /*
470 * Use the PCI BIOS to route an interrupt for a given device.
471 *
472 * Input:
473 * AX = PCIBIOS_ROUTE_INTERRUPT
474 * BH = bus
475 * BL = device [7:3] / function [2:0]
476 * CH = IRQ
477 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D)
478 */
479 static int
480 pci_pir_biosroute(int bus, int device, int func, int pin, int irq)
481 {
482 struct bios_regs args;
483
484 args.eax = PCIBIOS_ROUTE_INTERRUPT;
485 args.ebx = (bus << 8) | (device << 3) | func;
486 args.ecx = (irq << 8) | (0xa + pin);
487 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)));
488 }
489
490
491 /*
492 * Route a PCI interrupt using a link device from the $PIR.
493 */
494 int
495 pci_pir_route_interrupt(int bus, int device, int func, int pin)
496 {
497 struct pci_link_lookup lookup;
498 struct pci_link *pci_link;
499 int error, irq;
500
501 if (pci_route_table == NULL)
502 return (PCI_INVALID_IRQ);
503
504 /* Lookup link device for this PCI device/pin. */
505 pci_link = NULL;
506 lookup.bus = bus;
507 lookup.device = device;
508 lookup.pin = pin - 1;
509 lookup.pci_link_ptr = &pci_link;
510 pci_pir_walk_table(pci_pir_find_link_handler, &lookup);
511 if (pci_link == NULL) {
512 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus,
513 device, pin - 1 + 'A');
514 return (PCI_INVALID_IRQ);
515 }
516
517 /*
518 * Pick a new interrupt if we don't have one already. We look for
519 * an interrupt from several different sets. First, we check the
520 * set of PCI only interrupts from the $PIR. Second, we check the
521 * set of known-good interrupts that the BIOS has already used.
522 * Lastly, we check the "all possible valid IRQs" set.
523 */
524 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
525 irq = pci_pir_choose_irq(pci_link,
526 pci_route_table->pt_header.ph_pci_irqs);
527 if (!PCI_INTERRUPT_VALID(irq))
528 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs);
529 if (!PCI_INTERRUPT_VALID(irq))
530 irq = pci_pir_choose_irq(pci_link,
531 pci_irq_override_mask);
532 if (!PCI_INTERRUPT_VALID(irq)) {
533 if (bootverbose)
534 printf(
535 "$PIR: Failed to route interrupt for %d:%d INT%c\n",
536 bus, device, pin - 1 + 'A');
537 return (PCI_INVALID_IRQ);
538 }
539 pci_link->pl_irq = irq;
540 }
541
542 /* Ask the BIOS to route this IRQ if we haven't done so already. */
543 if (!pci_link->pl_routed) {
544 error = pci_pir_biosroute(bus, device, func, pin - 1,
545 pci_link->pl_irq);
546
547 /* Ignore errors when routing a unique interrupt. */
548 if (error && !powerof2(pci_link->pl_irqmask)) {
549 printf("$PIR: ROUTE_INTERRUPT failed.\n");
550 return (PCI_INVALID_IRQ);
551 }
552 pci_link->pl_routed = 1;
553
554 /* Ensure the interrupt is set to level/low trigger. */
555 KASSERT(pir_device != NULL, ("missing pir device"));
556 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq,
557 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
558 }
559 if (bootverbose)
560 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device,
561 pin - 1 + 'A', pci_link->pl_irq);
562 return (pci_link->pl_irq);
563 }
564
565 /*
566 * Try to pick an interrupt for the specified link from the interrupts
567 * set in the mask.
568 */
569 static int
570 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask)
571 {
572 int i, irq, realmask;
573
574 /* XXX: Need to have a #define of known bad IRQs to also mask out? */
575 realmask = pci_link->pl_irqmask & irqmask;
576 if (realmask == 0)
577 return (PCI_INVALID_IRQ);
578
579 /* Find IRQ with lowest weight. */
580 irq = PCI_INVALID_IRQ;
581 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) {
582 if (!(realmask & 1 << i))
583 continue;
584 if (irq == PCI_INVALID_IRQ ||
585 pir_interrupt_weight[i] < pir_interrupt_weight[irq])
586 irq = i;
587 }
588 if (bootverbose && PCI_INTERRUPT_VALID(irq)) {
589 printf("$PIR: Found IRQ %d for link %#x from ", irq,
590 pci_link->pl_id);
591 pci_print_irqmask(realmask);
592 printf("\n");
593 }
594 return (irq);
595 }
596
597 static void
598 pci_print_irqmask(u_int16_t irqs)
599 {
600 int i, first;
601
602 if (irqs == 0) {
603 printf("none");
604 return;
605 }
606 first = 1;
607 for (i = 0; i < 16; i++, irqs >>= 1)
608 if (irqs & 1) {
609 if (!first)
610 printf(" ");
611 else
612 first = 0;
613 printf("%d", i);
614 }
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);
Cache object: d0c9aad484132a3a43c50de79ef834be
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