1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 *
25 * pci_resource.c -- routines to retrieve available bus resources from
26 * the MP Spec. Table and Hotplug Resource Table
27 */
28
29 #include <sys/types.h>
30 #include <sys/memlist.h>
31 #include <sys/pci_impl.h>
32 #include <sys/systm.h>
33 #include <sys/cmn_err.h>
34 #include <sys/acpi/acpi.h>
35 #include <sys/acpica.h>
36 #include "mps_table.h"
37 #include "pcihrt.h"
38
39 extern int pci_boot_debug;
40 extern int pci_bios_maxbus;
41 #define dprintf if (pci_boot_debug) printf
42
43 static int tbl_init = 0;
44 static uchar_t *mps_extp = NULL;
45 static uchar_t *mps_ext_endp = NULL;
46 static struct php_entry *hrt_hpep;
47 static int hrt_entry_cnt = 0;
48 static int acpi_cb_cnt = 0;
49
50 static void mps_probe(void);
51 static void acpi_pci_probe(void);
52 static int mps_find_bus_res(int, int, struct memlist **);
53 static void hrt_probe(void);
54 static int hrt_find_bus_res(int, int, struct memlist **);
55 static int acpi_find_bus_res(int, int, struct memlist **);
56 static uchar_t *find_sig(uchar_t *cp, int len, char *sig);
57 static int checksum(unsigned char *cp, int len);
58 static ACPI_STATUS acpi_wr_cb(ACPI_RESOURCE *rp, void *context);
59 void bus_res_fini(void);
60 static void acpi_trim_bus_ranges(void);
61
62 struct memlist *acpi_io_res[256];
63 struct memlist *acpi_mem_res[256];
64 struct memlist *acpi_pmem_res[256];
65 struct memlist *acpi_bus_res[256];
66
67 /*
68 * -1 = attempt ACPI resource discovery
69 * 0 = don't attempt ACPI resource discovery
70 * 1 = ACPI resource discovery successful
71 */
72 volatile int acpi_resource_discovery = -1;
73
74 struct memlist *
75 find_bus_res(int bus, int type)
76 {
77 struct memlist *res = NULL;
78
79 if (tbl_init == 0) {
80 tbl_init = 1;
81 acpi_pci_probe();
82 hrt_probe();
83 mps_probe();
84 }
85
86 if (acpi_find_bus_res(bus, type, &res) > 0)
87 return (res);
88
89 if (hrt_find_bus_res(bus, type, &res) > 0)
90 return (res);
91
92 (void) mps_find_bus_res(bus, type, &res);
93 return (res);
94 }
95
96
97 static void
98 acpi_pci_probe(void)
99 {
100 ACPI_HANDLE ah;
101 dev_info_t *dip;
102 int bus;
103
104 if (acpi_resource_discovery == 0)
105 return;
106
107 for (bus = 0; bus <= pci_bios_maxbus; bus++) {
108 /* if no dip or no ACPI handle, no resources to discover */
109 dip = pci_bus_res[bus].dip;
110 if ((dip == NULL) ||
111 (ACPI_FAILURE(acpica_get_handle(dip, &ah))))
112 continue;
113
114 (void) AcpiWalkResources(ah, "_CRS", acpi_wr_cb,
115 (void *)(uintptr_t)bus);
116 }
117
118 if (acpi_cb_cnt > 0) {
119 acpi_resource_discovery = 1;
120 acpi_trim_bus_ranges();
121 }
122 }
123
124 /*
125 * Trim overlapping bus ranges in acpi_bus_res[]
126 * Some BIOSes report root-bridges with bus ranges that
127 * overlap, for example:"0..255" and "8..255". Lower-numbered
128 * ranges are trimmed by upper-numbered ranges (so "0..255" would
129 * be trimmed to "0..7", in the example).
130 */
131 static void
132 acpi_trim_bus_ranges()
133 {
134 struct memlist *ranges, *current;
135 int bus;
136
137 ranges = NULL;
138
139 /*
140 * Assumptions:
141 * - there exists at most 1 bus range entry for each bus number
142 * - there are no (broken) ranges that start at the same bus number
143 */
144 for (bus = 0; bus < 256; bus++) {
145 struct memlist *prev, *orig, *new;
146 /* skip buses with no range entry */
147 if ((orig = acpi_bus_res[bus]) == NULL)
148 continue;
149
150 /*
151 * create copy of existing range and overload
152 * 'prev' pointer to link existing to new copy
153 */
154 new = memlist_alloc();
155 new->ml_address = orig->ml_address;
156 new->ml_size = orig->ml_size;
157 new->ml_prev = orig;
158
159 /* sorted insertion of 'new' into ranges list */
160 for (current = ranges, prev = NULL; current != NULL;
161 prev = current, current = current->ml_next)
162 if (new->ml_address < current->ml_address)
163 break;
164
165 if (prev == NULL) {
166 /* place at beginning of (possibly) empty list */
167 new->ml_next = ranges;
168 ranges = new;
169 } else {
170 /* place in list (possibly at end) */
171 new->ml_next = current;
172 prev->ml_next = new;
173 }
174 }
175
176 /* scan the list, perform trimming */
177 current = ranges;
178 while (current != NULL) {
179 struct memlist *next = current->ml_next;
180
181 /* done when no range above current */
182 if (next == NULL)
183 break;
184
185 /*
186 * trim size in original range element
187 * (current->ml_prev points to the original range)
188 */
189 if ((current->ml_address + current->ml_size) > next->ml_address)
190 current->ml_prev->ml_size =
191 next->ml_address - current->ml_address;
192
193 current = next;
194 }
195
196 /* discard the list */
197 memlist_free_all(&ranges); /* OK if ranges == NULL */
198 }
199
200 static int
201 acpi_find_bus_res(int bus, int type, struct memlist **res)
202 {
203
204 switch (type) {
205 case IO_TYPE:
206 *res = acpi_io_res[bus];
207 break;
208 case MEM_TYPE:
209 *res = acpi_mem_res[bus];
210 break;
211 case PREFETCH_TYPE:
212 *res = acpi_pmem_res[bus];
213 break;
214 case BUSRANGE_TYPE:
215 *res = acpi_bus_res[bus];
216 break;
217 default:
218 *res = NULL;
219 break;
220 }
221
222 /* memlist_count() treats NULL head as zero-length */
223 return (memlist_count(*res));
224 }
225
226 void
227 bus_res_fini(void)
228 {
229 int bus;
230
231 for (bus = 0; bus <= pci_bios_maxbus; bus++) {
232 memlist_free_all(&acpi_io_res[bus]);
233 memlist_free_all(&acpi_mem_res[bus]);
234 memlist_free_all(&acpi_pmem_res[bus]);
235 memlist_free_all(&acpi_bus_res[bus]);
236 }
237 }
238
239
240 struct memlist **
241 rlistpp(UINT8 t, UINT8 flags, int bus)
242 {
243 switch (t) {
244
245 case ACPI_MEMORY_RANGE:
246 /* is this really the best we've got? */
247 if (((flags >> 1) & 0x3) == ACPI_PREFETCHABLE_MEMORY)
248 return (&acpi_pmem_res[bus]);
249 else
250 return (&acpi_mem_res[bus]);
251
252 case ACPI_IO_RANGE: return &acpi_io_res[bus];
253 case ACPI_BUS_NUMBER_RANGE: return &acpi_bus_res[bus];
254 }
255 return ((struct memlist **)NULL);
256 }
257
258
259 ACPI_STATUS
260 acpi_wr_cb(ACPI_RESOURCE *rp, void *context)
261 {
262 int bus = (intptr_t)context;
263
264 /* ignore consumed resources */
265 if (rp->Data.Address.ProducerConsumer == 1)
266 return (AE_OK);
267
268 switch (rp->Type) {
269 case ACPI_RESOURCE_TYPE_IRQ:
270 /* never expect to see a PCI bus produce an Interrupt */
271 dprintf("%s\n", "IRQ");
272 break;
273
274 case ACPI_RESOURCE_TYPE_DMA:
275 /* never expect to see a PCI bus produce DMA */
276 dprintf("%s\n", "DMA");
277 break;
278
279 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
280 dprintf("%s\n", "START_DEPENDENT");
281 break;
282
283 case ACPI_RESOURCE_TYPE_END_DEPENDENT:
284 dprintf("%s\n", "END_DEPENDENT");
285 break;
286
287 case ACPI_RESOURCE_TYPE_IO:
288 if (rp->Data.Io.AddressLength == 0)
289 break;
290 acpi_cb_cnt++;
291 memlist_insert(&acpi_io_res[bus], rp->Data.Io.Minimum,
292 rp->Data.Io.AddressLength);
293 break;
294
295 case ACPI_RESOURCE_TYPE_FIXED_IO:
296 /* only expect to see this as a consumer */
297 dprintf("%s\n", "FIXED_IO");
298 break;
299
300 case ACPI_RESOURCE_TYPE_VENDOR:
301 dprintf("%s\n", "VENDOR");
302 break;
303
304 case ACPI_RESOURCE_TYPE_END_TAG:
305 dprintf("%s\n", "END_TAG");
306 break;
307
308 case ACPI_RESOURCE_TYPE_MEMORY24:
309 /* only expect to see this as a consumer */
310 dprintf("%s\n", "MEMORY24");
311 break;
312
313 case ACPI_RESOURCE_TYPE_MEMORY32:
314 /* only expect to see this as a consumer */
315 dprintf("%s\n", "MEMORY32");
316 break;
317
318 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
319 /* only expect to see this as a consumer */
320 dprintf("%s\n", "FIXED_MEMORY32");
321 break;
322
323 case ACPI_RESOURCE_TYPE_ADDRESS16:
324 if (rp->Data.Address16.AddressLength == 0)
325 break;
326 acpi_cb_cnt++;
327 memlist_insert(rlistpp(rp->Data.Address16.ResourceType,
328 rp->Data.Address16.Info.TypeSpecific, bus),
329 rp->Data.Address16.Minimum,
330 rp->Data.Address16.AddressLength);
331 break;
332
333 case ACPI_RESOURCE_TYPE_ADDRESS32:
334 if (rp->Data.Address32.AddressLength == 0)
335 break;
336 acpi_cb_cnt++;
337 memlist_insert(rlistpp(rp->Data.Address32.ResourceType,
338 rp->Data.Address32.Info.TypeSpecific, bus),
339 rp->Data.Address32.Minimum,
340 rp->Data.Address32.AddressLength);
341 break;
342
343 case ACPI_RESOURCE_TYPE_ADDRESS64:
344 /*
345 * We comment out this block because we currently cannot deal with
346 * PCI 64-bit addresses. Will revisit this when we add PCI 64-bit MMIO
347 * support.
348 */
349 #if 0
350 if (rp->Data.Address64.AddressLength == 0)
351 break;
352 acpi_cb_cnt++;
353 memlist_insert(rlistpp(rp->Data.Address64.ResourceType,
354 rp->Data.Address64.Info.TypeSpecific, bus),
355 rp->Data.Address64.Minimum,
356 rp->Data.Address64.AddressLength);
357 #endif
358 break;
359
360 case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
361 #if 0 /* Will revisit this when we add PCI 64-bit MMIO support */
362 if (rp->Data.ExtAddress64.AddressLength == 0)
363 break;
364 acpi_cb_cnt++;
365 memlist_insert(rlistpp(rp->Data.ExtAddress64.ResourceType,
366 rp->Data.ExtAddress64.Info.TypeSpecific, bus),
367 rp->Data.ExtAddress64.Minimum,
368 rp->Data.ExtAddress64.AddressLength);
369 #endif
370 break;
371
372 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
373 /* never expect to see a PCI bus produce an Interrupt */
374 dprintf("%s\n", "EXTENDED_IRQ");
375 break;
376
377 case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
378 /* never expect to see a PCI bus produce an GAS */
379 dprintf("%s\n", "GENERIC_REGISTER");
380 break;
381 }
382
383 return (AE_OK);
384 }
385
386 static void
387 mps_probe()
388 {
389 uchar_t *extp;
390 struct mps_fps_hdr *fpp = NULL;
391 struct mps_ct_hdr *ctp;
392 uintptr_t ebda_start, base_end;
393 ushort_t ebda_seg, base_size, ext_len, base_len, base_end_seg;
394
395 base_size = *((ushort_t *)(0x413));
396 ebda_seg = *((ushort_t *)(0x40e));
397 ebda_start = ((uint32_t)ebda_seg) << 4;
398 if (ebda_seg != 0) {
399 fpp = (struct mps_fps_hdr *)find_sig(
400 (uchar_t *)ebda_start, 1024, "_MP_");
401 }
402 if (fpp == NULL) {
403 base_end_seg = (base_size > 512) ? 0x9FC0 : 0x7FC0;
404 if (base_end_seg != ebda_seg) {
405 base_end = ((uintptr_t)base_end_seg) << 4;
406 fpp = (struct mps_fps_hdr *)find_sig(
407 (uchar_t *)base_end, 1024, "_MP_");
408 }
409 }
410 if (fpp == NULL) {
411 fpp = (struct mps_fps_hdr *)find_sig(
412 (uchar_t *)0xF0000, 0x10000, "_MP_");
413 }
414
415 if (fpp == NULL) {
416 dprintf("MP Spec table doesn't exist");
417 return;
418 } else {
419 dprintf("Found MP Floating Pointer Structure at %p\n",
420 (void *)fpp);
421 }
422
423 if (checksum((uchar_t *)fpp, fpp->fps_len * 16) != 0) {
424 dprintf("MP Floating Pointer Structure checksum error");
425 return;
426 }
427
428 ctp = (struct mps_ct_hdr *)(uintptr_t)fpp->fps_mpct_paddr;
429 if (ctp->ct_sig != 0x504d4350) { /* check "PCMP" signature */
430 dprintf("MP Configuration Table signature is wrong");
431 return;
432 }
433
434 base_len = ctp->ct_len;
435 if (checksum((uchar_t *)ctp, base_len) != 0) {
436 dprintf("MP Configuration Table checksum error");
437 return;
438 }
439 if (ctp->ct_spec_rev != 4) { /* not MPSpec rev 1.4 */
440 dprintf("MP Spec 1.1 found - extended table doesn't exist");
441 return;
442 }
443 if ((ext_len = ctp->ct_ext_tbl_len) == 0) {
444 dprintf("MP Spec 1.4 found - extended table doesn't exist");
445 return;
446 }
447 extp = (uchar_t *)ctp + base_len;
448 if (((checksum(extp, ext_len) + ctp->ct_ext_cksum) & 0xFF) != 0) {
449 dprintf("MP Extended Table checksum error");
450 return;
451 }
452 mps_extp = extp;
453 mps_ext_endp = mps_extp + ext_len;
454 }
455
456
457 static int
458 mps_find_bus_res(int bus, int type, struct memlist **res)
459 {
460 struct sasm *sasmp;
461 uchar_t *extp;
462 int res_cnt;
463
464 if (mps_extp == NULL)
465 return (0);
466 extp = mps_extp;
467 res_cnt = 0;
468 while (extp < mps_ext_endp) {
469 switch (*extp) {
470 case SYS_AS_MAPPING:
471 sasmp = (struct sasm *)extp;
472 if (((int)sasmp->sasm_as_type) == type &&
473 ((int)sasmp->sasm_bus_id) == bus) {
474 if (sasmp->sasm_as_base_hi != 0 ||
475 sasmp->sasm_as_len_hi != 0) {
476 printf("64 bits address space\n");
477 extp += SYS_AS_MAPPING_SIZE;
478 break;
479 }
480 memlist_insert(res,
481 (uint64_t)sasmp->sasm_as_base,
482 sasmp->sasm_as_len);
483 res_cnt++;
484 }
485 extp += SYS_AS_MAPPING_SIZE;
486 break;
487 case BUS_HIERARCHY_DESC:
488 extp += BUS_HIERARCHY_DESC_SIZE;
489 break;
490 case COMP_BUS_AS_MODIFIER:
491 extp += COMP_BUS_AS_MODIFIER_SIZE;
492 break;
493 default:
494 cmn_err(CE_WARN, "Unknown descriptor type %d"
495 " in BIOS Multiprocessor Spec table.",
496 *extp);
497 while (*res) {
498 struct memlist *tmp = *res;
499 *res = tmp->ml_next;
500 memlist_free(tmp);
501 }
502 return (0);
503 }
504 }
505 return (res_cnt);
506 }
507
508 static void
509 hrt_probe()
510 {
511 struct hrt_hdr *hrtp;
512
513 dprintf("search PCI Hot-Plug Resource Table starting at 0xF0000\n");
514 if ((hrtp = (struct hrt_hdr *)find_sig((uchar_t *)0xF0000,
515 0x10000, "$HRT")) == NULL) {
516 dprintf("NO PCI Hot-Plug Resource Table");
517 return;
518 }
519 dprintf("Found PCI Hot-Plug Resource Table at %p\n", (void *)hrtp);
520 if (hrtp->hrt_ver != 1) {
521 dprintf("PCI Hot-Plug Resource Table version no. <> 1\n");
522 return;
523 }
524 hrt_entry_cnt = (int)hrtp->hrt_entry_cnt;
525 dprintf("No. of PCI hot-plug slot entries = 0x%x\n", hrt_entry_cnt);
526 hrt_hpep = (struct php_entry *)(hrtp + 1);
527 }
528
529 static int
530 hrt_find_bus_res(int bus, int type, struct memlist **res)
531 {
532 int res_cnt, i;
533 struct php_entry *hpep;
534
535 if (hrt_hpep == NULL || hrt_entry_cnt == 0)
536 return (0);
537 hpep = hrt_hpep;
538 res_cnt = 0;
539 for (i = 0; i < hrt_entry_cnt; i++, hpep++) {
540 if (hpep->php_pri_bus != bus)
541 continue;
542 if (type == IO_TYPE) {
543 if (hpep->php_io_start == 0 || hpep->php_io_size == 0)
544 continue;
545 memlist_insert(res, (uint64_t)hpep->php_io_start,
546 (uint64_t)hpep->php_io_size);
547 res_cnt++;
548 } else if (type == MEM_TYPE) {
549 if (hpep->php_mem_start == 0 || hpep->php_mem_size == 0)
550 continue;
551 memlist_insert(res,
552 (uint64_t)(((int)hpep->php_mem_start) << 16),
553 (uint64_t)(((int)hpep->php_mem_size) << 16));
554 res_cnt++;
555 } else if (type == PREFETCH_TYPE) {
556 if (hpep->php_pfmem_start == 0 ||
557 hpep->php_pfmem_size == 0)
558 continue;
559 memlist_insert(res,
560 (uint64_t)(((int)hpep->php_pfmem_start) << 16),
561 (uint64_t)(((int)hpep->php_pfmem_size) << 16));
562 res_cnt++;
563 }
564 }
565 return (res_cnt);
566 }
567
568 static uchar_t *
569 find_sig(uchar_t *cp, int len, char *sig)
570 {
571 long i;
572
573 /* Search for the "_MP_" or "$HRT" signature */
574 for (i = 0; i < len; i += 16) {
575 if (cp[0] == sig[0] && cp[1] == sig[1] &&
576 cp[2] == sig[2] && cp[3] == sig[3])
577 return (cp);
578 cp += 16;
579 }
580 return (NULL);
581 }
582
583 static int
584 checksum(unsigned char *cp, int len)
585 {
586 int i;
587 unsigned int cksum;
588
589 for (i = cksum = 0; i < len; i++)
590 cksum += (unsigned int) *cp++;
591
592 return ((int)(cksum & 0xFF));
593 }
594
595 #ifdef UNUSED_BUS_HIERARY_INFO
596
597 /*
598 * At this point, the bus hierarchy entries do not appear to
599 * provide anything we can't find out from PCI config space.
600 * The only interesting bit is the ISA bus number, which we
601 * don't care.
602 */
603 int
604 mps_find_parent_bus(int bus)
605 {
606 struct sasm *sasmp;
607 uchar_t *extp;
608
609 if (mps_extp == NULL)
610 return (-1);
611
612 extp = mps_extp;
613 while (extp < mps_ext_endp) {
614 bhdp = (struct bhd *)extp;
615 switch (*extp) {
616 case SYS_AS_MAPPING:
617 extp += SYS_AS_MAPPING_SIZE;
618 break;
619 case BUS_HIERARCHY_DESC:
620 if (bhdp->bhd_bus_id == bus)
621 return (bhdp->bhd_parent);
622 extp += BUS_HIERARCHY_DESC_SIZE;
623 break;
624 case COMP_BUS_AS_MODIFIER:
625 extp += COMP_BUS_AS_MODIFIER_SIZE;
626 break;
627 default:
628 cmn_err(CE_WARN, "Unknown descriptor type %d"
629 " in BIOS Multiprocessor Spec table.",
630 *extp);
631 return (-1);
632 }
633 }
634 return (-1);
635 }
636
637 int
638 hrt_find_bus_range(int bus)
639 {
640 int i, max_bus, sub_bus;
641 struct php_entry *hpep;
642
643 if (hrt_hpep == NULL || hrt_entry_cnt == 0) {
644 return (-1);
645 }
646 hpep = hrt_hpep;
647 max_bus = -1;
648 for (i = 0; i < hrt_entry_cnt; i++, hpep++) {
649 if (hpep->php_pri_bus != bus)
650 continue;
651 sub_bus = (int)hpep->php_subord_bus;
652 if (sub_bus > max_bus)
653 max_bus = sub_bus;
654 }
655 return (max_bus);
656 }
657
658 #endif /* UNUSED_BUS_HIERARY_INFO */