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