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 * All rights reserved.
6 * Copyright (c) 2004, John Baldwin <jhb@FreeBSD.org>
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 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 #ifdef PC98
112 /* IRQs 3, 5, 7, 9, 10, 11, 12, 13 */
113 #define PCI_IRQ_OVERRIDE_MASK 0x3e68
114 #else
115 /* IRQs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15 */
116 #define PCI_IRQ_OVERRIDE_MASK 0xdef8
117 #endif
118
119 static uint32_t 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 functions on the PCI device at bus/device
264 * have 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_VENDOR, 2);
274 if (value == PCIV_INVALID)
275 return (PCI_INVALID_IRQ);
276 value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
277 if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
278 return (PCI_INVALID_IRQ);
279 if (value & PCIM_MFDEV)
280 maxfunc = PCI_FUNCMAX;
281 else
282 maxfunc = 0;
283
284 /* Scan all possible functions at this device. */
285 for (func = 0; func <= maxfunc; func++) {
286 value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2);
287 if (value == PCIV_INVALID)
288 continue;
289 value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);
290
291 /*
292 * See if it uses the pin in question. Note that the passed
293 * in pin uses 0 for A, .. 3 for D whereas the intpin
294 * register uses 0 for no interrupt, 1 for A, .. 4 for D.
295 */
296 if (value != pin + 1)
297 continue;
298 value = pci_cfgregread(bus, device, func, PCIR_INTLINE, 1);
299 if (bootverbose)
300 printf(
301 "$PIR: Found matching pin for %d.%d.INT%c at func %d: %d\n",
302 bus, device, pin + 'A', func, value);
303 if (value != PCI_INVALID_IRQ)
304 return (value);
305 }
306 return (PCI_INVALID_IRQ);
307 }
308
309 /*
310 * Try to initialize IRQ based on this device's IRQ.
311 */
312 static void
313 pci_pir_initial_irqs(struct PIR_entry *entry, struct PIR_intpin *intpin,
314 void *arg)
315 {
316 struct pci_link *pci_link;
317 uint8_t irq, pin;
318
319 pin = intpin - entry->pe_intpin;
320 pci_link = pci_pir_find_link(intpin->link);
321 irq = pci_pir_search_irq(entry->pe_bus, entry->pe_device, pin);
322 if (irq == PCI_INVALID_IRQ || irq == pci_link->pl_irq)
323 return;
324
325 /* Don't trust any BIOS IRQs greater than 15. */
326 if (irq >= NUM_ISA_INTERRUPTS) {
327 printf(
328 "$PIR: Ignoring invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
329 irq, entry->pe_bus, entry->pe_device, pin + 'A',
330 pci_link->pl_id);
331 return;
332 }
333
334 /*
335 * If we don't have an IRQ for this link yet, then we trust the
336 * BIOS, even if it seems invalid from the $PIR entries.
337 */
338 if (pci_link->pl_irq == PCI_INVALID_IRQ) {
339 if (!pci_pir_valid_irq(pci_link, irq))
340 printf(
341 "$PIR: Using invalid BIOS IRQ %d from %d.%d.INT%c for link %#x\n",
342 irq, entry->pe_bus, entry->pe_device, pin + 'A',
343 pci_link->pl_id);
344 pci_link->pl_irq = irq;
345 pci_link->pl_routed = 1;
346 return;
347 }
348
349 /*
350 * We have an IRQ and it doesn't match the current IRQ for this
351 * link. If the new IRQ is invalid, then warn about it and ignore
352 * it. If the old IRQ is invalid and the new IRQ is valid, then
353 * prefer the new IRQ instead. If both IRQs are valid, then just
354 * use the first one. Note that if we ever get into this situation
355 * we are having to guess which setting the BIOS actually routed.
356 * Perhaps we should just give up instead.
357 */
358 if (!pci_pir_valid_irq(pci_link, irq)) {
359 printf(
360 "$PIR: BIOS IRQ %d for %d.%d.INT%c is not valid for link %#x\n",
361 irq, entry->pe_bus, entry->pe_device, pin + 'A',
362 pci_link->pl_id);
363 } else if (!pci_pir_valid_irq(pci_link, pci_link->pl_irq)) {
364 printf(
365 "$PIR: Preferring valid BIOS IRQ %d from %d.%d.INT%c for link %#x to IRQ %d\n",
366 irq, entry->pe_bus, entry->pe_device, pin + 'A',
367 pci_link->pl_id, pci_link->pl_irq);
368 pci_link->pl_irq = irq;
369 pci_link->pl_routed = 1;
370 } else
371 printf(
372 "$PIR: BIOS IRQ %d for %d.%d.INT%c does not match link %#x irq %d\n",
373 irq, entry->pe_bus, entry->pe_device, pin + 'A',
374 pci_link->pl_id, pci_link->pl_irq);
375 }
376
377 /*
378 * Parse $PIR to enumerate link devices and attempt to determine their
379 * initial state. This could perhaps be cleaner if we had drivers for the
380 * various interrupt routers as they could read the initial IRQ for each
381 * link.
382 */
383 static void
384 pci_pir_parse(void)
385 {
386 char tunable_buffer[64];
387 struct pci_link *pci_link;
388 int i, irq;
389
390 /* Only parse once. */
391 if (pir_parsed)
392 return;
393 pir_parsed = 1;
394
395 /* Enumerate link devices. */
396 TAILQ_INIT(&pci_links);
397 pci_pir_walk_table(pci_pir_create_links, NULL);
398 if (bootverbose) {
399 printf("$PIR: Links after initial probe:\n");
400 pci_pir_dump_links();
401 }
402
403 /*
404 * Check to see if the BIOS has already routed any of the links by
405 * checking each device connected to each link to see if it has a
406 * valid IRQ.
407 */
408 pci_pir_walk_table(pci_pir_initial_irqs, NULL);
409 if (bootverbose) {
410 printf("$PIR: Links after initial IRQ discovery:\n");
411 pci_pir_dump_links();
412 }
413
414 /*
415 * Allow the user to override the IRQ for a given link device. We
416 * allow invalid IRQs to be specified but warn about them. An IRQ
417 * of 255 or 0 clears any preset IRQ.
418 */
419 i = 0;
420 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
421 snprintf(tunable_buffer, sizeof(tunable_buffer),
422 "hw.pci.link.%#x.irq", pci_link->pl_id);
423 if (getenv_int(tunable_buffer, &irq) == 0)
424 continue;
425 if (irq == 0)
426 irq = PCI_INVALID_IRQ;
427 if (irq != PCI_INVALID_IRQ &&
428 !pci_pir_valid_irq(pci_link, irq) && bootverbose)
429 printf(
430 "$PIR: Warning, IRQ %d for link %#x is not listed as valid\n",
431 irq, pci_link->pl_id);
432 pci_link->pl_routed = 0;
433 pci_link->pl_irq = irq;
434 i = 1;
435 }
436 if (bootverbose && i) {
437 printf("$PIR: Links after tunable overrides:\n");
438 pci_pir_dump_links();
439 }
440
441 /*
442 * Build initial interrupt weights as well as bitmap of "known-good"
443 * IRQs that the BIOS has already used for PCI link devices.
444 */
445 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
446 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq))
447 continue;
448 pir_bios_irqs |= 1 << pci_link->pl_irq;
449 pir_interrupt_weight[pci_link->pl_irq] +=
450 pci_link->pl_references;
451 }
452 if (bootverbose) {
453 printf("$PIR: IRQs used by BIOS: ");
454 pci_print_irqmask(pir_bios_irqs);
455 printf("\n");
456 printf("$PIR: Interrupt Weights:\n[ ");
457 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
458 printf(" %3d", i);
459 printf(" ]\n[ ");
460 for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
461 printf(" %3d", pir_interrupt_weight[i]);
462 printf(" ]\n");
463 }
464 }
465
466 /*
467 * Use the PCI BIOS to route an interrupt for a given device.
468 *
469 * Input:
470 * AX = PCIBIOS_ROUTE_INTERRUPT
471 * BH = bus
472 * BL = device [7:3] / function [2:0]
473 * CH = IRQ
474 * CL = Interrupt Pin (0x0A = A, ... 0x0D = D)
475 */
476 static int
477 pci_pir_biosroute(int bus, int device, int func, int pin, int irq)
478 {
479 struct bios_regs args;
480
481 args.eax = PCIBIOS_ROUTE_INTERRUPT;
482 args.ebx = (bus << 8) | (device << 3) | func;
483 args.ecx = (irq << 8) | (0xa + pin);
484 return (bios32(&args, PCIbios.ventry, GSEL(GCODE_SEL, SEL_KPL)));
485 }
486
487
488 /*
489 * Route a PCI interrupt using a link device from the $PIR.
490 */
491 int
492 pci_pir_route_interrupt(int bus, int device, int func, int pin)
493 {
494 struct pci_link_lookup lookup;
495 struct pci_link *pci_link;
496 int error, irq;
497
498 if (pci_route_table == NULL)
499 return (PCI_INVALID_IRQ);
500
501 /* Lookup link device for this PCI device/pin. */
502 pci_link = NULL;
503 lookup.bus = bus;
504 lookup.device = device;
505 lookup.pin = pin - 1;
506 lookup.pci_link_ptr = &pci_link;
507 pci_pir_walk_table(pci_pir_find_link_handler, &lookup);
508 if (pci_link == NULL) {
509 printf("$PIR: No matching entry for %d.%d.INT%c\n", bus,
510 device, pin - 1 + 'A');
511 return (PCI_INVALID_IRQ);
512 }
513
514 /*
515 * Pick a new interrupt if we don't have one already. We look
516 * for an interrupt from several different sets. First, if
517 * this link only has one valid IRQ, use that. Second, we
518 * check the set of PCI only interrupts from the $PIR. Third,
519 * we check the set of known-good interrupts that the BIOS has
520 * already used. Lastly, we check the "all possible valid
521 * IRQs" set.
522 */
523 if (!PCI_INTERRUPT_VALID(pci_link->pl_irq)) {
524 if (pci_link->pl_irqmask != 0 && powerof2(pci_link->pl_irqmask))
525 irq = ffs(pci_link->pl_irqmask) - 1;
526 else
527 irq = pci_pir_choose_irq(pci_link,
528 pci_route_table->pt_header.ph_pci_irqs);
529 if (!PCI_INTERRUPT_VALID(irq))
530 irq = pci_pir_choose_irq(pci_link, pir_bios_irqs);
531 if (!PCI_INTERRUPT_VALID(irq))
532 irq = pci_pir_choose_irq(pci_link,
533 pci_irq_override_mask);
534 if (!PCI_INTERRUPT_VALID(irq)) {
535 if (bootverbose)
536 printf(
537 "$PIR: Failed to route interrupt for %d:%d INT%c\n",
538 bus, device, pin - 1 + 'A');
539 return (PCI_INVALID_IRQ);
540 }
541 pci_link->pl_irq = irq;
542 }
543
544 /* Ask the BIOS to route this IRQ if we haven't done so already. */
545 if (!pci_link->pl_routed) {
546 error = pci_pir_biosroute(bus, device, func, pin - 1,
547 pci_link->pl_irq);
548
549 /* Ignore errors when routing a unique interrupt. */
550 if (error && !powerof2(pci_link->pl_irqmask)) {
551 printf("$PIR: ROUTE_INTERRUPT failed.\n");
552 return (PCI_INVALID_IRQ);
553 }
554 pci_link->pl_routed = 1;
555
556 /* Ensure the interrupt is set to level/low trigger. */
557 KASSERT(pir_device != NULL, ("missing pir device"));
558 BUS_CONFIG_INTR(pir_device, pci_link->pl_irq,
559 INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
560 }
561 if (bootverbose)
562 printf("$PIR: %d:%d INT%c routed to irq %d\n", bus, device,
563 pin - 1 + 'A', pci_link->pl_irq);
564 return (pci_link->pl_irq);
565 }
566
567 /*
568 * Try to pick an interrupt for the specified link from the interrupts
569 * set in the mask.
570 */
571 static int
572 pci_pir_choose_irq(struct pci_link *pci_link, int irqmask)
573 {
574 int i, irq, realmask;
575
576 /* XXX: Need to have a #define of known bad IRQs to also mask out? */
577 realmask = pci_link->pl_irqmask & irqmask;
578 if (realmask == 0)
579 return (PCI_INVALID_IRQ);
580
581 /* Find IRQ with lowest weight. */
582 irq = PCI_INVALID_IRQ;
583 for (i = 0; i < NUM_ISA_INTERRUPTS; i++) {
584 if (!(realmask & 1 << i))
585 continue;
586 if (irq == PCI_INVALID_IRQ ||
587 pir_interrupt_weight[i] < pir_interrupt_weight[irq])
588 irq = i;
589 }
590 if (bootverbose && PCI_INTERRUPT_VALID(irq)) {
591 printf("$PIR: Found IRQ %d for link %#x from ", irq,
592 pci_link->pl_id);
593 pci_print_irqmask(realmask);
594 printf("\n");
595 }
596 return (irq);
597 }
598
599 static void
600 pci_print_irqmask(u_int16_t irqs)
601 {
602 int i, first;
603
604 if (irqs == 0) {
605 printf("none");
606 return;
607 }
608 first = 1;
609 for (i = 0; i < 16; i++, irqs >>= 1)
610 if (irqs & 1) {
611 if (!first)
612 printf(" ");
613 else
614 first = 0;
615 printf("%d", i);
616 }
617 }
618
619 /*
620 * Display link devices.
621 */
622 static void
623 pci_pir_dump_links(void)
624 {
625 struct pci_link *pci_link;
626
627 printf("Link IRQ Rtd Ref IRQs\n");
628 TAILQ_FOREACH(pci_link, &pci_links, pl_links) {
629 printf("%#4x %3d %c %3d ", pci_link->pl_id,
630 pci_link->pl_irq, pci_link->pl_routed ? 'Y' : 'N',
631 pci_link->pl_references);
632 pci_print_irqmask(pci_link->pl_irqmask);
633 printf("\n");
634 }
635 }
636
637 /*
638 * See if any interrupts for a given PCI bus are routed in the PIR. Don't
639 * even bother looking if the BIOS doesn't support routing anyways. If we
640 * are probing a PCI-PCI bridge, then require_parse will be true and we should
641 * only succeed if a host-PCI bridge has already attached and parsed the PIR.
642 */
643 int
644 pci_pir_probe(int bus, int require_parse)
645 {
646 int i;
647
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 pseudo device pir0 for the $PIR table.
658 */
659
660 static int
661 pir_probe(device_t dev)
662 {
663 char buf[64];
664
665 snprintf(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, 0, 0);
Cache object: 184d6a8a49a455e6569f4001d17eaae5
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