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1/*
2 * acpi.c - Architecture-Specific Low-Level ACPI Support
3 *
4 * Copyright (C) 1999 VA Linux Systems
5 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
6 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Copyright (C) 2000 Intel Corp.
9 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
10 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
11 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
12 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
13 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
14 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
15 *
16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation; either version 2 of the License, or
21 * (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be useful,
24 * but WITHOUT ANY WARRANTY; without even the implied warranty of
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 * GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public License
29 * along with this program; if not, write to the Free Software
30 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 *
32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/kernel.h>
38#include <linux/sched.h>
39#include <linux/smp.h>
40#include <linux/string.h>
41#include <linux/types.h>
42#include <linux/irq.h>
43#include <linux/acpi.h>
44#include <linux/efi.h>
45#include <linux/mmzone.h>
46#include <linux/nodemask.h>
47#include <linux/slab.h>
48#include <acpi/processor.h>
49#include <asm/io.h>
50#include <asm/iosapic.h>
51#include <asm/machvec.h>
52#include <asm/page.h>
53#include <asm/system.h>
54#include <asm/numa.h>
55#include <asm/sal.h>
56#include <asm/cyclone.h>
57#include <asm/xen/hypervisor.h>
58
59#define BAD_MADT_ENTRY(entry, end) ( \
60 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
61 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
62
63#define PREFIX "ACPI: "
64
65u32 acpi_rsdt_forced;
66unsigned int acpi_cpei_override;
67unsigned int acpi_cpei_phys_cpuid;
68
69unsigned long acpi_wakeup_address = 0;
70
71#ifdef CONFIG_IA64_GENERIC
72static unsigned long __init acpi_find_rsdp(void)
73{
74 unsigned long rsdp_phys = 0;
75
76 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
77 rsdp_phys = efi.acpi20;
78 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
79 printk(KERN_WARNING PREFIX
80 "v1.0/r0.71 tables no longer supported\n");
81 return rsdp_phys;
82}
83
84const char __init *
85acpi_get_sysname(void)
86{
87 unsigned long rsdp_phys;
88 struct acpi_table_rsdp *rsdp;
89 struct acpi_table_xsdt *xsdt;
90 struct acpi_table_header *hdr;
91#ifdef CONFIG_DMAR
92 u64 i, nentries;
93#endif
94
95 rsdp_phys = acpi_find_rsdp();
96 if (!rsdp_phys) {
97 printk(KERN_ERR
98 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
99 return "dig";
100 }
101
102 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
103 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
104 printk(KERN_ERR
105 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
106 return "dig";
107 }
108
109 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
110 hdr = &xsdt->header;
111 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
112 printk(KERN_ERR
113 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
114 return "dig";
115 }
116
117 if (!strcmp(hdr->oem_id, "HP")) {
118 return "hpzx1";
119 } else if (!strcmp(hdr->oem_id, "SGI")) {
120 if (!strcmp(hdr->oem_table_id + 4, "UV"))
121 return "uv";
122 else
123 return "sn2";
124 } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
125 return "xen";
126 }
127
128#ifdef CONFIG_DMAR
129 /* Look for Intel IOMMU */
130 nentries = (hdr->length - sizeof(*hdr)) /
131 sizeof(xsdt->table_offset_entry[0]);
132 for (i = 0; i < nentries; i++) {
133 hdr = __va(xsdt->table_offset_entry[i]);
134 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
135 sizeof(ACPI_SIG_DMAR) - 1) == 0)
136 return "dig_vtd";
137 }
138#endif
139
140 return "dig";
141}
142#endif /* CONFIG_IA64_GENERIC */
143
144#define ACPI_MAX_PLATFORM_INTERRUPTS 256
145
146/* Array to record platform interrupt vectors for generic interrupt routing. */
147int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
148 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
149};
150
151enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
152
153/*
154 * Interrupt routing API for device drivers. Provides interrupt vector for
155 * a generic platform event. Currently only CPEI is implemented.
156 */
157int acpi_request_vector(u32 int_type)
158{
159 int vector = -1;
160
161 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
162 /* corrected platform error interrupt */
163 vector = platform_intr_list[int_type];
164 } else
165 printk(KERN_ERR
166 "acpi_request_vector(): invalid interrupt type\n");
167 return vector;
168}
169
170char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
171{
172 return __va(phys_addr);
173}
174
175void __init __acpi_unmap_table(char *map, unsigned long size)
176{
177}
178
179/* --------------------------------------------------------------------------
180 Boot-time Table Parsing
181 -------------------------------------------------------------------------- */
182
183static int available_cpus __initdata;
184struct acpi_table_madt *acpi_madt __initdata;
185static u8 has_8259;
186
187static int __init
188acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
189 const unsigned long end)
190{
191 struct acpi_madt_local_apic_override *lapic;
192
193 lapic = (struct acpi_madt_local_apic_override *)header;
194
195 if (BAD_MADT_ENTRY(lapic, end))
196 return -EINVAL;
197
198 if (lapic->address) {
199 iounmap(ipi_base_addr);
200 ipi_base_addr = ioremap(lapic->address, 0);
201 }
202 return 0;
203}
204
205static int __init
206acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
207{
208 struct acpi_madt_local_sapic *lsapic;
209
210 lsapic = (struct acpi_madt_local_sapic *)header;
211
212 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
213
214 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
215#ifdef CONFIG_SMP
216 smp_boot_data.cpu_phys_id[available_cpus] =
217 (lsapic->id << 8) | lsapic->eid;
218#endif
219 ++available_cpus;
220 }
221
222 total_cpus++;
223 return 0;
224}
225
226static int __init
227acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
228{
229 struct acpi_madt_local_apic_nmi *lacpi_nmi;
230
231 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
232
233 if (BAD_MADT_ENTRY(lacpi_nmi, end))
234 return -EINVAL;
235
236 /* TBD: Support lapic_nmi entries */
237 return 0;
238}
239
240static int __init
241acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
242{
243 struct acpi_madt_io_sapic *iosapic;
244
245 iosapic = (struct acpi_madt_io_sapic *)header;
246
247 if (BAD_MADT_ENTRY(iosapic, end))
248 return -EINVAL;
249
250 return iosapic_init(iosapic->address, iosapic->global_irq_base);
251}
252
253static unsigned int __initdata acpi_madt_rev;
254
255static int __init
256acpi_parse_plat_int_src(struct acpi_subtable_header * header,
257 const unsigned long end)
258{
259 struct acpi_madt_interrupt_source *plintsrc;
260 int vector;
261
262 plintsrc = (struct acpi_madt_interrupt_source *)header;
263
264 if (BAD_MADT_ENTRY(plintsrc, end))
265 return -EINVAL;
266
267 /*
268 * Get vector assignment for this interrupt, set attributes,
269 * and program the IOSAPIC routing table.
270 */
271 vector = iosapic_register_platform_intr(plintsrc->type,
272 plintsrc->global_irq,
273 plintsrc->io_sapic_vector,
274 plintsrc->eid,
275 plintsrc->id,
276 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
277 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
278 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
279 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
280 ACPI_MADT_TRIGGER_EDGE) ?
281 IOSAPIC_EDGE : IOSAPIC_LEVEL);
282
283 platform_intr_list[plintsrc->type] = vector;
284 if (acpi_madt_rev > 1) {
285 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
286 }
287
288 /*
289 * Save the physical id, so we can check when its being removed
290 */
291 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
292
293 return 0;
294}
295
296#ifdef CONFIG_HOTPLUG_CPU
297unsigned int can_cpei_retarget(void)
298{
299 extern int cpe_vector;
300 extern unsigned int force_cpei_retarget;
301
302 /*
303 * Only if CPEI is supported and the override flag
304 * is present, otherwise return that its re-targettable
305 * if we are in polling mode.
306 */
307 if (cpe_vector > 0) {
308 if (acpi_cpei_override || force_cpei_retarget)
309 return 1;
310 else
311 return 0;
312 }
313 return 1;
314}
315
316unsigned int is_cpu_cpei_target(unsigned int cpu)
317{
318 unsigned int logical_id;
319
320 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
321
322 if (logical_id == cpu)
323 return 1;
324 else
325 return 0;
326}
327
328void set_cpei_target_cpu(unsigned int cpu)
329{
330 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
331}
332#endif
333
334unsigned int get_cpei_target_cpu(void)
335{
336 return acpi_cpei_phys_cpuid;
337}
338
339static int __init
340acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
341 const unsigned long end)
342{
343 struct acpi_madt_interrupt_override *p;
344
345 p = (struct acpi_madt_interrupt_override *)header;
346
347 if (BAD_MADT_ENTRY(p, end))
348 return -EINVAL;
349
350 iosapic_override_isa_irq(p->source_irq, p->global_irq,
351 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
352 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
353 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
354 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
355 ACPI_MADT_TRIGGER_EDGE) ?
356 IOSAPIC_EDGE : IOSAPIC_LEVEL);
357 return 0;
358}
359
360static int __init
361acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
362{
363 struct acpi_madt_nmi_source *nmi_src;
364
365 nmi_src = (struct acpi_madt_nmi_source *)header;
366
367 if (BAD_MADT_ENTRY(nmi_src, end))
368 return -EINVAL;
369
370 /* TBD: Support nimsrc entries */
371 return 0;
372}
373
374static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
375{
376 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
377
378 /*
379 * Unfortunately ITC_DRIFT is not yet part of the
380 * official SAL spec, so the ITC_DRIFT bit is not
381 * set by the BIOS on this hardware.
382 */
383 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
384
385 cyclone_setup();
386 }
387}
388
389static int __init acpi_parse_madt(struct acpi_table_header *table)
390{
391 if (!table)
392 return -EINVAL;
393
394 acpi_madt = (struct acpi_table_madt *)table;
395
396 acpi_madt_rev = acpi_madt->header.revision;
397
398 /* remember the value for reference after free_initmem() */
399#ifdef CONFIG_ITANIUM
400 has_8259 = 1; /* Firmware on old Itanium systems is broken */
401#else
402 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
403#endif
404 iosapic_system_init(has_8259);
405
406 /* Get base address of IPI Message Block */
407
408 if (acpi_madt->address)
409 ipi_base_addr = ioremap(acpi_madt->address, 0);
410
411 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
412
413 acpi_madt_oem_check(acpi_madt->header.oem_id,
414 acpi_madt->header.oem_table_id);
415
416 return 0;
417}
418
419#ifdef CONFIG_ACPI_NUMA
420
421#undef SLIT_DEBUG
422
423#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
424
425static int __initdata srat_num_cpus; /* number of cpus */
426static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
427#define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
428#define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
429static struct acpi_table_slit __initdata *slit_table;
430cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
431
432static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
433{
434 int pxm;
435
436 pxm = pa->proximity_domain_lo;
437 if (ia64_platform_is("sn2"))
438 pxm += pa->proximity_domain_hi[0] << 8;
439 return pxm;
440}
441
442static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
443{
444 int pxm;
445
446 pxm = ma->proximity_domain;
447 if (!ia64_platform_is("sn2"))
448 pxm &= 0xff;
449
450 return pxm;
451}
452
453/*
454 * ACPI 2.0 SLIT (System Locality Information Table)
455 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
456 */
457void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
458{
459 u32 len;
460
461 len = sizeof(struct acpi_table_header) + 8
462 + slit->locality_count * slit->locality_count;
463 if (slit->header.length != len) {
464 printk(KERN_ERR
465 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
466 len, slit->header.length);
467 return;
468 }
469 slit_table = slit;
470}
471
472void __init
473acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
474{
475 int pxm;
476
477 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
478 return;
479
480 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
481 printk_once(KERN_WARNING
482 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
483 ARRAY_SIZE(node_cpuid));
484 return;
485 }
486 pxm = get_processor_proximity_domain(pa);
487
488 /* record this node in proximity bitmap */
489 pxm_bit_set(pxm);
490
491 node_cpuid[srat_num_cpus].phys_id =
492 (pa->apic_id << 8) | (pa->local_sapic_eid);
493 /* nid should be overridden as logical node id later */
494 node_cpuid[srat_num_cpus].nid = pxm;
495 cpu_set(srat_num_cpus, early_cpu_possible_map);
496 srat_num_cpus++;
497}
498
499void __init
500acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
501{
502 unsigned long paddr, size;
503 int pxm;
504 struct node_memblk_s *p, *q, *pend;
505
506 pxm = get_memory_proximity_domain(ma);
507
508 /* fill node memory chunk structure */
509 paddr = ma->base_address;
510 size = ma->length;
511
512 /* Ignore disabled entries */
513 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
514 return;
515
516 /* record this node in proximity bitmap */
517 pxm_bit_set(pxm);
518
519 /* Insertion sort based on base address */
520 pend = &node_memblk[num_node_memblks];
521 for (p = &node_memblk[0]; p < pend; p++) {
522 if (paddr < p->start_paddr)
523 break;
524 }
525 if (p < pend) {
526 for (q = pend - 1; q >= p; q--)
527 *(q + 1) = *q;
528 }
529 p->start_paddr = paddr;
530 p->size = size;
531 p->nid = pxm;
532 num_node_memblks++;
533}
534
535void __init acpi_numa_arch_fixup(void)
536{
537 int i, j, node_from, node_to;
538
539 /* If there's no SRAT, fix the phys_id and mark node 0 online */
540 if (srat_num_cpus == 0) {
541 node_set_online(0);
542 node_cpuid[0].phys_id = hard_smp_processor_id();
543 return;
544 }
545
546 /*
547 * MCD - This can probably be dropped now. No need for pxm ID to node ID
548 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
549 */
550 nodes_clear(node_online_map);
551 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
552 if (pxm_bit_test(i)) {
553 int nid = acpi_map_pxm_to_node(i);
554 node_set_online(nid);
555 }
556 }
557
558 /* set logical node id in memory chunk structure */
559 for (i = 0; i < num_node_memblks; i++)
560 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
561
562 /* assign memory bank numbers for each chunk on each node */
563 for_each_online_node(i) {
564 int bank;
565
566 bank = 0;
567 for (j = 0; j < num_node_memblks; j++)
568 if (node_memblk[j].nid == i)
569 node_memblk[j].bank = bank++;
570 }
571
572 /* set logical node id in cpu structure */
573 for_each_possible_early_cpu(i)
574 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
575
576 printk(KERN_INFO "Number of logical nodes in system = %d\n",
577 num_online_nodes());
578 printk(KERN_INFO "Number of memory chunks in system = %d\n",
579 num_node_memblks);
580
581 if (!slit_table) {
582 for (i = 0; i < MAX_NUMNODES; i++)
583 for (j = 0; j < MAX_NUMNODES; j++)
584 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
585 REMOTE_DISTANCE;
586 return;
587 }
588
589 memset(numa_slit, -1, sizeof(numa_slit));
590 for (i = 0; i < slit_table->locality_count; i++) {
591 if (!pxm_bit_test(i))
592 continue;
593 node_from = pxm_to_node(i);
594 for (j = 0; j < slit_table->locality_count; j++) {
595 if (!pxm_bit_test(j))
596 continue;
597 node_to = pxm_to_node(j);
598 node_distance(node_from, node_to) =
599 slit_table->entry[i * slit_table->locality_count + j];
600 }
601 }
602
603#ifdef SLIT_DEBUG
604 printk("ACPI 2.0 SLIT locality table:\n");
605 for_each_online_node(i) {
606 for_each_online_node(j)
607 printk("%03d ", node_distance(i, j));
608 printk("\n");
609 }
610#endif
611}
612#endif /* CONFIG_ACPI_NUMA */
613
614/*
615 * success: return IRQ number (>=0)
616 * failure: return < 0
617 */
618int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
619{
620 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
621 return gsi;
622
623 if (has_8259 && gsi < 16)
624 return isa_irq_to_vector(gsi);
625
626 return iosapic_register_intr(gsi,
627 (polarity ==
628 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
629 IOSAPIC_POL_LOW,
630 (triggering ==
631 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
632 IOSAPIC_LEVEL);
633}
634
635void acpi_unregister_gsi(u32 gsi)
636{
637 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
638 return;
639
640 if (has_8259 && gsi < 16)
641 return;
642
643 iosapic_unregister_intr(gsi);
644}
645
646static int __init acpi_parse_fadt(struct acpi_table_header *table)
647{
648 struct acpi_table_header *fadt_header;
649 struct acpi_table_fadt *fadt;
650
651 if (!table)
652 return -EINVAL;
653
654 fadt_header = (struct acpi_table_header *)table;
655 if (fadt_header->revision != 3)
656 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
657
658 fadt = (struct acpi_table_fadt *)fadt_header;
659
660 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
661 ACPI_ACTIVE_LOW);
662 return 0;
663}
664
665int __init early_acpi_boot_init(void)
666{
667 int ret;
668
669 /*
670 * do a partial walk of MADT to determine how many CPUs
671 * we have including offline CPUs
672 */
673 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
674 printk(KERN_ERR PREFIX "Can't find MADT\n");
675 return 0;
676 }
677
678 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
679 acpi_parse_lsapic, NR_CPUS);
680 if (ret < 1)
681 printk(KERN_ERR PREFIX
682 "Error parsing MADT - no LAPIC entries\n");
683
684#ifdef CONFIG_SMP
685 if (available_cpus == 0) {
686 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
687 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
688 smp_boot_data.cpu_phys_id[available_cpus] =
689 hard_smp_processor_id();
690 available_cpus = 1; /* We've got at least one of these, no? */
691 }
692 smp_boot_data.cpu_count = available_cpus;
693#endif
694 /* Make boot-up look pretty */
695 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
696 total_cpus);
697
698 return 0;
699}
700
701int __init acpi_boot_init(void)
702{
703
704 /*
705 * MADT
706 * ----
707 * Parse the Multiple APIC Description Table (MADT), if exists.
708 * Note that this table provides platform SMP configuration
709 * information -- the successor to MPS tables.
710 */
711
712 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
713 printk(KERN_ERR PREFIX "Can't find MADT\n");
714 goto skip_madt;
715 }
716
717 /* Local APIC */
718
719 if (acpi_table_parse_madt
720 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
721 printk(KERN_ERR PREFIX
722 "Error parsing LAPIC address override entry\n");
723
724 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
725 < 0)
726 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
727
728 /* I/O APIC */
729
730 if (acpi_table_parse_madt
731 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
732 if (!ia64_platform_is("sn2"))
733 printk(KERN_ERR PREFIX
734 "Error parsing MADT - no IOSAPIC entries\n");
735 }
736
737 /* System-Level Interrupt Routing */
738
739 if (acpi_table_parse_madt
740 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
741 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
742 printk(KERN_ERR PREFIX
743 "Error parsing platform interrupt source entry\n");
744
745 if (acpi_table_parse_madt
746 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
747 printk(KERN_ERR PREFIX
748 "Error parsing interrupt source overrides entry\n");
749
750 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
751 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
752 skip_madt:
753
754 /*
755 * FADT says whether a legacy keyboard controller is present.
756 * The FADT also contains an SCI_INT line, by which the system
757 * gets interrupts such as power and sleep buttons. If it's not
758 * on a Legacy interrupt, it needs to be setup.
759 */
760 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
761 printk(KERN_ERR PREFIX "Can't find FADT\n");
762
763#ifdef CONFIG_ACPI_NUMA
764#ifdef CONFIG_SMP
765 if (srat_num_cpus == 0) {
766 int cpu, i = 1;
767 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
768 if (smp_boot_data.cpu_phys_id[cpu] !=
769 hard_smp_processor_id())
770 node_cpuid[i++].phys_id =
771 smp_boot_data.cpu_phys_id[cpu];
772 }
773#endif
774 build_cpu_to_node_map();
775#endif
776 return 0;
777}
778
779int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
780{
781 int tmp;
782
783 if (has_8259 && gsi < 16)
784 *irq = isa_irq_to_vector(gsi);
785 else {
786 tmp = gsi_to_irq(gsi);
787 if (tmp == -1)
788 return -1;
789 *irq = tmp;
790 }
791 return 0;
792}
793
794int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
795{
796 if (isa_irq >= 16)
797 return -1;
798 *gsi = isa_irq;
799 return 0;
800}
801
802/*
803 * ACPI based hotplug CPU support
804 */
805#ifdef CONFIG_ACPI_HOTPLUG_CPU
806static __cpuinit
807int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
808{
809#ifdef CONFIG_ACPI_NUMA
810 int pxm_id;
811 int nid;
812
813 pxm_id = acpi_get_pxm(handle);
814 /*
815 * We don't have cpu-only-node hotadd. But if the system equips
816 * SRAT table, pxm is already found and node is ready.
817 * So, just pxm_to_nid(pxm) is OK.
818 * This code here is for the system which doesn't have full SRAT
819 * table for possible cpus.
820 */
821 nid = acpi_map_pxm_to_node(pxm_id);
822 node_cpuid[cpu].phys_id = physid;
823 node_cpuid[cpu].nid = nid;
824#endif
825 return (0);
826}
827
828int additional_cpus __initdata = -1;
829
830static __init int setup_additional_cpus(char *s)
831{
832 if (s)
833 additional_cpus = simple_strtol(s, NULL, 0);
834
835 return 0;
836}
837
838early_param("additional_cpus", setup_additional_cpus);
839
840/*
841 * cpu_possible_map should be static, it cannot change as CPUs
842 * are onlined, or offlined. The reason is per-cpu data-structures
843 * are allocated by some modules at init time, and dont expect to
844 * do this dynamically on cpu arrival/departure.
845 * cpu_present_map on the other hand can change dynamically.
846 * In case when cpu_hotplug is not compiled, then we resort to current
847 * behaviour, which is cpu_possible == cpu_present.
848 * - Ashok Raj
849 *
850 * Three ways to find out the number of additional hotplug CPUs:
851 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
852 * - The user can overwrite it with additional_cpus=NUM
853 * - Otherwise don't reserve additional CPUs.
854 */
855__init void prefill_possible_map(void)
856{
857 int i;
858 int possible, disabled_cpus;
859
860 disabled_cpus = total_cpus - available_cpus;
861
862 if (additional_cpus == -1) {
863 if (disabled_cpus > 0)
864 additional_cpus = disabled_cpus;
865 else
866 additional_cpus = 0;
867 }
868
869 possible = available_cpus + additional_cpus;
870
871 if (possible > nr_cpu_ids)
872 possible = nr_cpu_ids;
873
874 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
875 possible, max((possible - available_cpus), 0));
876
877 for (i = 0; i < possible; i++)
878 set_cpu_possible(i, true);
879}
880
881static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
882{
883 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
884 union acpi_object *obj;
885 struct acpi_madt_local_sapic *lsapic;
886 cpumask_t tmp_map;
887 int cpu, physid;
888
889 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
890 return -EINVAL;
891
892 if (!buffer.length || !buffer.pointer)
893 return -EINVAL;
894
895 obj = buffer.pointer;
896 if (obj->type != ACPI_TYPE_BUFFER)
897 {
898 kfree(buffer.pointer);
899 return -EINVAL;
900 }
901
902 lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
903
904 if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
905 (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
906 kfree(buffer.pointer);
907 return -EINVAL;
908 }
909
910 physid = ((lsapic->id << 8) | (lsapic->eid));
911
912 kfree(buffer.pointer);
913 buffer.length = ACPI_ALLOCATE_BUFFER;
914 buffer.pointer = NULL;
915
916 cpumask_complement(&tmp_map, cpu_present_mask);
917 cpu = cpumask_first(&tmp_map);
918 if (cpu >= nr_cpu_ids)
919 return -EINVAL;
920
921 acpi_map_cpu2node(handle, cpu, physid);
922
923 cpu_set(cpu, cpu_present_map);
924 ia64_cpu_to_sapicid[cpu] = physid;
925
926 acpi_processor_set_pdc(handle);
927
928 *pcpu = cpu;
929 return (0);
930}
931
932/* wrapper to silence section mismatch warning */
933int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
934{
935 return _acpi_map_lsapic(handle, pcpu);
936}
937EXPORT_SYMBOL(acpi_map_lsapic);
938
939int acpi_unmap_lsapic(int cpu)
940{
941 ia64_cpu_to_sapicid[cpu] = -1;
942 cpu_clear(cpu, cpu_present_map);
943
944#ifdef CONFIG_ACPI_NUMA
945 /* NUMA specific cleanup's */
946#endif
947
948 return (0);
949}
950
951EXPORT_SYMBOL(acpi_unmap_lsapic);
952#endif /* CONFIG_ACPI_HOTPLUG_CPU */
953
954#ifdef CONFIG_ACPI_NUMA
955static acpi_status __devinit
956acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
957{
958 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
959 union acpi_object *obj;
960 struct acpi_madt_io_sapic *iosapic;
961 unsigned int gsi_base;
962 int pxm, node;
963
964 /* Only care about objects w/ a method that returns the MADT */
965 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
966 return AE_OK;
967
968 if (!buffer.length || !buffer.pointer)
969 return AE_OK;
970
971 obj = buffer.pointer;
972 if (obj->type != ACPI_TYPE_BUFFER ||
973 obj->buffer.length < sizeof(*iosapic)) {
974 kfree(buffer.pointer);
975 return AE_OK;
976 }
977
978 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
979
980 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
981 kfree(buffer.pointer);
982 return AE_OK;
983 }
984
985 gsi_base = iosapic->global_irq_base;
986
987 kfree(buffer.pointer);
988
989 /*
990 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
991 * us which node to associate this with.
992 */
993 pxm = acpi_get_pxm(handle);
994 if (pxm < 0)
995 return AE_OK;
996
997 node = pxm_to_node(pxm);
998
999 if (node >= MAX_NUMNODES || !node_online(node) ||
1000 cpumask_empty(cpumask_of_node(node)))
1001 return AE_OK;
1002
1003 /* We know a gsi to node mapping! */
1004 map_iosapic_to_node(gsi_base, node);
1005 return AE_OK;
1006}
1007
1008static int __init
1009acpi_map_iosapics (void)
1010{
1011 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1012 return 0;
1013}
1014
1015fs_initcall(acpi_map_iosapics);
1016#endif /* CONFIG_ACPI_NUMA */
1017
1018int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1019{
1020 int err;
1021
1022 if ((err = iosapic_init(phys_addr, gsi_base)))
1023 return err;
1024
1025#ifdef CONFIG_ACPI_NUMA
1026 acpi_map_iosapic(handle, 0, NULL, NULL);
1027#endif /* CONFIG_ACPI_NUMA */
1028
1029 return 0;
1030}
1031
1032EXPORT_SYMBOL(acpi_register_ioapic);
1033
1034int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1035{
1036 return iosapic_remove(gsi_base);
1037}
1038
1039EXPORT_SYMBOL(acpi_unregister_ioapic);
1040
1041/*
1042 * acpi_suspend_lowlevel() - save kernel state and suspend.
1043 *
1044 * TBD when when IA64 starts to support suspend...
1045 */
1046int acpi_suspend_lowlevel(void) { return 0; }