c4784494970e5ed0ebf54d67bffbbedf5c31783a
[linux-3.10.git] / arch / ia64 / kernel / acpi.c
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 <asm/io.h>
48 #include <asm/iosapic.h>
49 #include <asm/machvec.h>
50 #include <asm/page.h>
51 #include <asm/system.h>
52 #include <asm/numa.h>
53 #include <asm/sal.h>
54 #include <asm/cyclone.h>
55
56 #define BAD_MADT_ENTRY(entry, end) (                                        \
57                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
58                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
59
60 #define PREFIX                  "ACPI: "
61
62 void (*pm_idle) (void);
63 EXPORT_SYMBOL(pm_idle);
64 void (*pm_power_off) (void);
65 EXPORT_SYMBOL(pm_power_off);
66
67 unsigned int acpi_cpei_override;
68 unsigned int acpi_cpei_phys_cpuid;
69
70 const char *acpi_get_sysname(void)
71 {
72 #ifdef CONFIG_IA64_GENERIC
73         unsigned long rsdp_phys;
74         struct acpi_table_rsdp *rsdp;
75         struct acpi_table_xsdt *xsdt;
76         struct acpi_table_header *hdr;
77
78         rsdp_phys = acpi_find_rsdp();
79         if (!rsdp_phys) {
80                 printk(KERN_ERR
81                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
82                 return "dig";
83         }
84
85         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
86         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
87                 printk(KERN_ERR
88                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
89                 return "dig";
90         }
91
92         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
93         hdr = &xsdt->header;
94         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
95                 printk(KERN_ERR
96                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
97                 return "dig";
98         }
99
100         if (!strcmp(hdr->oem_id, "HP")) {
101                 return "hpzx1";
102         } else if (!strcmp(hdr->oem_id, "SGI")) {
103                 return "sn2";
104         }
105
106         return "dig";
107 #else
108 # if defined (CONFIG_IA64_HP_SIM)
109         return "hpsim";
110 # elif defined (CONFIG_IA64_HP_ZX1)
111         return "hpzx1";
112 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
113         return "hpzx1_swiotlb";
114 # elif defined (CONFIG_IA64_SGI_SN2)
115         return "sn2";
116 # elif defined (CONFIG_IA64_DIG)
117         return "dig";
118 # else
119 #       error Unknown platform.  Fix acpi.c.
120 # endif
121 #endif
122 }
123
124 #ifdef CONFIG_ACPI
125
126 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
127
128 /* Array to record platform interrupt vectors for generic interrupt routing. */
129 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
130         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
131 };
132
133 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
134
135 /*
136  * Interrupt routing API for device drivers.  Provides interrupt vector for
137  * a generic platform event.  Currently only CPEI is implemented.
138  */
139 int acpi_request_vector(u32 int_type)
140 {
141         int vector = -1;
142
143         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
144                 /* corrected platform error interrupt */
145                 vector = platform_intr_list[int_type];
146         } else
147                 printk(KERN_ERR
148                        "acpi_request_vector(): invalid interrupt type\n");
149         return vector;
150 }
151
152 char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
153 {
154         return __va(phys_addr);
155 }
156
157 /* --------------------------------------------------------------------------
158                             Boot-time Table Parsing
159    -------------------------------------------------------------------------- */
160
161 static int total_cpus __initdata;
162 static int available_cpus __initdata;
163 struct acpi_table_madt *acpi_madt __initdata;
164 static u8 has_8259;
165
166 static int __init
167 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
168                           const unsigned long end)
169 {
170         struct acpi_madt_local_apic_override *lapic;
171
172         lapic = (struct acpi_madt_local_apic_override *)header;
173
174         if (BAD_MADT_ENTRY(lapic, end))
175                 return -EINVAL;
176
177         if (lapic->address) {
178                 iounmap(ipi_base_addr);
179                 ipi_base_addr = ioremap(lapic->address, 0);
180         }
181         return 0;
182 }
183
184 static int __init
185 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
186 {
187         struct acpi_madt_local_sapic *lsapic;
188
189         lsapic = (struct acpi_madt_local_sapic *)header;
190
191         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
192
193         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
194 #ifdef CONFIG_SMP
195                 smp_boot_data.cpu_phys_id[available_cpus] =
196                     (lsapic->id << 8) | lsapic->eid;
197 #endif
198                 ++available_cpus;
199         }
200
201         total_cpus++;
202         return 0;
203 }
204
205 static int __init
206 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
207 {
208         struct acpi_madt_local_apic_nmi *lacpi_nmi;
209
210         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
211
212         if (BAD_MADT_ENTRY(lacpi_nmi, end))
213                 return -EINVAL;
214
215         /* TBD: Support lapic_nmi entries */
216         return 0;
217 }
218
219 static int __init
220 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
221 {
222         struct acpi_madt_io_sapic *iosapic;
223
224         iosapic = (struct acpi_madt_io_sapic *)header;
225
226         if (BAD_MADT_ENTRY(iosapic, end))
227                 return -EINVAL;
228
229         return iosapic_init(iosapic->address, iosapic->global_irq_base);
230 }
231
232 static unsigned int __initdata acpi_madt_rev;
233
234 static int __init
235 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
236                         const unsigned long end)
237 {
238         struct acpi_madt_interrupt_source *plintsrc;
239         int vector;
240
241         plintsrc = (struct acpi_madt_interrupt_source *)header;
242
243         if (BAD_MADT_ENTRY(plintsrc, end))
244                 return -EINVAL;
245
246         /*
247          * Get vector assignment for this interrupt, set attributes,
248          * and program the IOSAPIC routing table.
249          */
250         vector = iosapic_register_platform_intr(plintsrc->type,
251                                                 plintsrc->global_irq,
252                                                 plintsrc->io_sapic_vector,
253                                                 plintsrc->eid,
254                                                 plintsrc->id,
255                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
256                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
257                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
258                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
259                                                  ACPI_MADT_TRIGGER_EDGE) ?
260                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
261
262         platform_intr_list[plintsrc->type] = vector;
263         if (acpi_madt_rev > 1) {
264                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
265         }
266
267         /*
268          * Save the physical id, so we can check when its being removed
269          */
270         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
271
272         return 0;
273 }
274
275 #ifdef CONFIG_HOTPLUG_CPU
276 unsigned int can_cpei_retarget(void)
277 {
278         extern int cpe_vector;
279         extern unsigned int force_cpei_retarget;
280
281         /*
282          * Only if CPEI is supported and the override flag
283          * is present, otherwise return that its re-targettable
284          * if we are in polling mode.
285          */
286         if (cpe_vector > 0) {
287                 if (acpi_cpei_override || force_cpei_retarget)
288                         return 1;
289                 else
290                         return 0;
291         }
292         return 1;
293 }
294
295 unsigned int is_cpu_cpei_target(unsigned int cpu)
296 {
297         unsigned int logical_id;
298
299         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
300
301         if (logical_id == cpu)
302                 return 1;
303         else
304                 return 0;
305 }
306
307 void set_cpei_target_cpu(unsigned int cpu)
308 {
309         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
310 }
311 #endif
312
313 unsigned int get_cpei_target_cpu(void)
314 {
315         return acpi_cpei_phys_cpuid;
316 }
317
318 static int __init
319 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
320                        const unsigned long end)
321 {
322         struct acpi_madt_interrupt_override *p;
323
324         p = (struct acpi_madt_interrupt_override *)header;
325
326         if (BAD_MADT_ENTRY(p, end))
327                 return -EINVAL;
328
329         iosapic_override_isa_irq(p->source_irq, p->global_irq,
330                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
331                                   ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
332                                  IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
333                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
334                                  ACPI_MADT_TRIGGER_EDGE) ?
335                                  IOSAPIC_EDGE : IOSAPIC_LEVEL);
336         return 0;
337 }
338
339 static int __init
340 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
341 {
342         struct acpi_madt_nmi_source *nmi_src;
343
344         nmi_src = (struct acpi_madt_nmi_source *)header;
345
346         if (BAD_MADT_ENTRY(nmi_src, end))
347                 return -EINVAL;
348
349         /* TBD: Support nimsrc entries */
350         return 0;
351 }
352
353 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
354 {
355         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
356
357                 /*
358                  * Unfortunately ITC_DRIFT is not yet part of the
359                  * official SAL spec, so the ITC_DRIFT bit is not
360                  * set by the BIOS on this hardware.
361                  */
362                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
363
364                 cyclone_setup();
365         }
366 }
367
368 static int __init acpi_parse_madt(struct acpi_table_header *table)
369 {
370         if (!table)
371                 return -EINVAL;
372
373         acpi_madt = (struct acpi_table_madt *)table;
374
375         acpi_madt_rev = acpi_madt->header.revision;
376
377         /* remember the value for reference after free_initmem() */
378 #ifdef CONFIG_ITANIUM
379         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
380 #else
381         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
382 #endif
383         iosapic_system_init(has_8259);
384
385         /* Get base address of IPI Message Block */
386
387         if (acpi_madt->address)
388                 ipi_base_addr = ioremap(acpi_madt->address, 0);
389
390         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
391
392         acpi_madt_oem_check(acpi_madt->header.oem_id,
393                             acpi_madt->header.oem_table_id);
394
395         return 0;
396 }
397
398 #ifdef CONFIG_ACPI_NUMA
399
400 #undef SLIT_DEBUG
401
402 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
403
404 static int __initdata srat_num_cpus;    /* number of cpus */
405 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
406 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
407 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
408 static struct acpi_table_slit __initdata *slit_table;
409
410 static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
411 {
412         int pxm;
413
414         pxm = pa->proximity_domain_lo;
415         if (ia64_platform_is("sn2"))
416                 pxm += pa->proximity_domain_hi[0] << 8;
417         return pxm;
418 }
419
420 static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
421 {
422         int pxm;
423
424         pxm = ma->proximity_domain;
425         if (!ia64_platform_is("sn2"))
426                 pxm &= 0xff;
427
428         return pxm;
429 }
430
431 /*
432  * ACPI 2.0 SLIT (System Locality Information Table)
433  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
434  */
435 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
436 {
437         u32 len;
438
439         len = sizeof(struct acpi_table_header) + 8
440             + slit->locality_count * slit->locality_count;
441         if (slit->header.length != len) {
442                 printk(KERN_ERR
443                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
444                        len, slit->header.length);
445                 memset(numa_slit, 10, sizeof(numa_slit));
446                 return;
447         }
448         slit_table = slit;
449 }
450
451 void __init
452 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
453 {
454         int pxm;
455
456         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
457                 return;
458
459         pxm = get_processor_proximity_domain(pa);
460
461         /* record this node in proximity bitmap */
462         pxm_bit_set(pxm);
463
464         node_cpuid[srat_num_cpus].phys_id =
465             (pa->apic_id << 8) | (pa->local_sapic_eid);
466         /* nid should be overridden as logical node id later */
467         node_cpuid[srat_num_cpus].nid = pxm;
468         srat_num_cpus++;
469 }
470
471 void __init
472 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
473 {
474         unsigned long paddr, size;
475         int pxm;
476         struct node_memblk_s *p, *q, *pend;
477
478         pxm = get_memory_proximity_domain(ma);
479
480         /* fill node memory chunk structure */
481         paddr = ma->base_address;
482         size = ma->length;
483
484         /* Ignore disabled entries */
485         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
486                 return;
487
488         /* record this node in proximity bitmap */
489         pxm_bit_set(pxm);
490
491         /* Insertion sort based on base address */
492         pend = &node_memblk[num_node_memblks];
493         for (p = &node_memblk[0]; p < pend; p++) {
494                 if (paddr < p->start_paddr)
495                         break;
496         }
497         if (p < pend) {
498                 for (q = pend - 1; q >= p; q--)
499                         *(q + 1) = *q;
500         }
501         p->start_paddr = paddr;
502         p->size = size;
503         p->nid = pxm;
504         num_node_memblks++;
505 }
506
507 void __init acpi_numa_arch_fixup(void)
508 {
509         int i, j, node_from, node_to;
510
511         /* If there's no SRAT, fix the phys_id and mark node 0 online */
512         if (srat_num_cpus == 0) {
513                 node_set_online(0);
514                 node_cpuid[0].phys_id = hard_smp_processor_id();
515                 return;
516         }
517
518         /*
519          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
520          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
521          */
522         nodes_clear(node_online_map);
523         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
524                 if (pxm_bit_test(i)) {
525                         int nid = acpi_map_pxm_to_node(i);
526                         node_set_online(nid);
527                 }
528         }
529
530         /* set logical node id in memory chunk structure */
531         for (i = 0; i < num_node_memblks; i++)
532                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
533
534         /* assign memory bank numbers for each chunk on each node */
535         for_each_online_node(i) {
536                 int bank;
537
538                 bank = 0;
539                 for (j = 0; j < num_node_memblks; j++)
540                         if (node_memblk[j].nid == i)
541                                 node_memblk[j].bank = bank++;
542         }
543
544         /* set logical node id in cpu structure */
545         for (i = 0; i < srat_num_cpus; i++)
546                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
547
548         printk(KERN_INFO "Number of logical nodes in system = %d\n",
549                num_online_nodes());
550         printk(KERN_INFO "Number of memory chunks in system = %d\n",
551                num_node_memblks);
552
553         if (!slit_table)
554                 return;
555         memset(numa_slit, -1, sizeof(numa_slit));
556         for (i = 0; i < slit_table->locality_count; i++) {
557                 if (!pxm_bit_test(i))
558                         continue;
559                 node_from = pxm_to_node(i);
560                 for (j = 0; j < slit_table->locality_count; j++) {
561                         if (!pxm_bit_test(j))
562                                 continue;
563                         node_to = pxm_to_node(j);
564                         node_distance(node_from, node_to) =
565                             slit_table->entry[i * slit_table->locality_count + j];
566                 }
567         }
568
569 #ifdef SLIT_DEBUG
570         printk("ACPI 2.0 SLIT locality table:\n");
571         for_each_online_node(i) {
572                 for_each_online_node(j)
573                     printk("%03d ", node_distance(i, j));
574                 printk("\n");
575         }
576 #endif
577 }
578 #endif                          /* CONFIG_ACPI_NUMA */
579
580 /*
581  * success: return IRQ number (>=0)
582  * failure: return < 0
583  */
584 int acpi_register_gsi(u32 gsi, int triggering, int polarity)
585 {
586         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
587                 return gsi;
588
589         if (has_8259 && gsi < 16)
590                 return isa_irq_to_vector(gsi);
591
592         return iosapic_register_intr(gsi,
593                                      (polarity ==
594                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
595                                      IOSAPIC_POL_LOW,
596                                      (triggering ==
597                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
598                                      IOSAPIC_LEVEL);
599 }
600
601 EXPORT_SYMBOL(acpi_register_gsi);
602
603 void acpi_unregister_gsi(u32 gsi)
604 {
605         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
606                 return;
607
608         iosapic_unregister_intr(gsi);
609 }
610
611 EXPORT_SYMBOL(acpi_unregister_gsi);
612
613 static int __init acpi_parse_fadt(struct acpi_table_header *table)
614 {
615         struct acpi_table_header *fadt_header;
616         struct acpi_table_fadt *fadt;
617
618         if (!table)
619                 return -EINVAL;
620
621         fadt_header = (struct acpi_table_header *)table;
622         if (fadt_header->revision != 3)
623                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
624
625         fadt = (struct acpi_table_fadt *)fadt_header;
626
627         acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
628         return 0;
629 }
630
631 unsigned long __init acpi_find_rsdp(void)
632 {
633         unsigned long rsdp_phys = 0;
634
635         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
636                 rsdp_phys = efi.acpi20;
637         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
638                 printk(KERN_WARNING PREFIX
639                        "v1.0/r0.71 tables no longer supported\n");
640         return rsdp_phys;
641 }
642
643 int __init acpi_boot_init(void)
644 {
645
646         /*
647          * MADT
648          * ----
649          * Parse the Multiple APIC Description Table (MADT), if exists.
650          * Note that this table provides platform SMP configuration
651          * information -- the successor to MPS tables.
652          */
653
654         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
655                 printk(KERN_ERR PREFIX "Can't find MADT\n");
656                 goto skip_madt;
657         }
658
659         /* Local APIC */
660
661         if (acpi_table_parse_madt
662             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
663                 printk(KERN_ERR PREFIX
664                        "Error parsing LAPIC address override entry\n");
665
666         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
667             < 1)
668                 printk(KERN_ERR PREFIX
669                        "Error parsing MADT - no LAPIC entries\n");
670
671         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
672             < 0)
673                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
674
675         /* I/O APIC */
676
677         if (acpi_table_parse_madt
678             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1)
679                 printk(KERN_ERR PREFIX
680                        "Error parsing MADT - no IOSAPIC entries\n");
681
682         /* System-Level Interrupt Routing */
683
684         if (acpi_table_parse_madt
685             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
686              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
687                 printk(KERN_ERR PREFIX
688                        "Error parsing platform interrupt source entry\n");
689
690         if (acpi_table_parse_madt
691             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
692                 printk(KERN_ERR PREFIX
693                        "Error parsing interrupt source overrides entry\n");
694
695         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
696                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
697       skip_madt:
698
699         /*
700          * FADT says whether a legacy keyboard controller is present.
701          * The FADT also contains an SCI_INT line, by which the system
702          * gets interrupts such as power and sleep buttons.  If it's not
703          * on a Legacy interrupt, it needs to be setup.
704          */
705         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
706                 printk(KERN_ERR PREFIX "Can't find FADT\n");
707
708 #ifdef CONFIG_SMP
709         if (available_cpus == 0) {
710                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
711                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
712                 smp_boot_data.cpu_phys_id[available_cpus] =
713                     hard_smp_processor_id();
714                 available_cpus = 1;     /* We've got at least one of these, no? */
715         }
716         smp_boot_data.cpu_count = available_cpus;
717
718         smp_build_cpu_map();
719 # ifdef CONFIG_ACPI_NUMA
720         if (srat_num_cpus == 0) {
721                 int cpu, i = 1;
722                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
723                         if (smp_boot_data.cpu_phys_id[cpu] !=
724                             hard_smp_processor_id())
725                                 node_cpuid[i++].phys_id =
726                                     smp_boot_data.cpu_phys_id[cpu];
727         }
728 # endif
729 #endif
730 #ifdef CONFIG_ACPI_NUMA
731         build_cpu_to_node_map();
732 #endif
733         /* Make boot-up look pretty */
734         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
735                total_cpus);
736         return 0;
737 }
738
739 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
740 {
741         int vector;
742
743         if (has_8259 && gsi < 16)
744                 *irq = isa_irq_to_vector(gsi);
745         else {
746                 vector = gsi_to_vector(gsi);
747                 if (vector == -1)
748                         return -1;
749
750                 *irq = vector;
751         }
752         return 0;
753 }
754
755 /*
756  *  ACPI based hotplug CPU support
757  */
758 #ifdef CONFIG_ACPI_HOTPLUG_CPU
759 static
760 int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
761 {
762 #ifdef CONFIG_ACPI_NUMA
763         int pxm_id;
764         int nid;
765
766         pxm_id = acpi_get_pxm(handle);
767         /*
768          * We don't have cpu-only-node hotadd. But if the system equips
769          * SRAT table, pxm is already found and node is ready.
770          * So, just pxm_to_nid(pxm) is OK.
771          * This code here is for the system which doesn't have full SRAT
772          * table for possible cpus.
773          */
774         nid = acpi_map_pxm_to_node(pxm_id);
775         node_cpuid[cpu].phys_id = physid;
776         node_cpuid[cpu].nid = nid;
777 #endif
778         return (0);
779 }
780
781 int additional_cpus __initdata = -1;
782
783 static __init int setup_additional_cpus(char *s)
784 {
785         if (s)
786                 additional_cpus = simple_strtol(s, NULL, 0);
787
788         return 0;
789 }
790
791 early_param("additional_cpus", setup_additional_cpus);
792
793 /*
794  * cpu_possible_map should be static, it cannot change as CPUs
795  * are onlined, or offlined. The reason is per-cpu data-structures
796  * are allocated by some modules at init time, and dont expect to
797  * do this dynamically on cpu arrival/departure.
798  * cpu_present_map on the other hand can change dynamically.
799  * In case when cpu_hotplug is not compiled, then we resort to current
800  * behaviour, which is cpu_possible == cpu_present.
801  * - Ashok Raj
802  *
803  * Three ways to find out the number of additional hotplug CPUs:
804  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
805  * - The user can overwrite it with additional_cpus=NUM
806  * - Otherwise don't reserve additional CPUs.
807  */
808 __init void prefill_possible_map(void)
809 {
810         int i;
811         int possible, disabled_cpus;
812
813         disabled_cpus = total_cpus - available_cpus;
814
815         if (additional_cpus == -1) {
816                 if (disabled_cpus > 0)
817                         additional_cpus = disabled_cpus;
818                 else
819                         additional_cpus = 0;
820         }
821
822         possible = available_cpus + additional_cpus;
823
824         if (possible > NR_CPUS)
825                 possible = NR_CPUS;
826
827         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
828                 possible, max((possible - available_cpus), 0));
829
830         for (i = 0; i < possible; i++)
831                 cpu_set(i, cpu_possible_map);
832 }
833
834 int acpi_map_lsapic(acpi_handle handle, int *pcpu)
835 {
836         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
837         union acpi_object *obj;
838         struct acpi_madt_local_sapic *lsapic;
839         cpumask_t tmp_map;
840         long physid;
841         int cpu;
842
843         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
844                 return -EINVAL;
845
846         if (!buffer.length || !buffer.pointer)
847                 return -EINVAL;
848
849         obj = buffer.pointer;
850         if (obj->type != ACPI_TYPE_BUFFER)
851         {
852                 kfree(buffer.pointer);
853                 return -EINVAL;
854         }
855
856         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
857
858         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
859             (!lsapic->lapic_flags & ACPI_MADT_ENABLED)) {
860                 kfree(buffer.pointer);
861                 return -EINVAL;
862         }
863
864         physid = ((lsapic->id << 8) | (lsapic->eid));
865
866         kfree(buffer.pointer);
867         buffer.length = ACPI_ALLOCATE_BUFFER;
868         buffer.pointer = NULL;
869
870         cpus_complement(tmp_map, cpu_present_map);
871         cpu = first_cpu(tmp_map);
872         if (cpu >= NR_CPUS)
873                 return -EINVAL;
874
875         acpi_map_cpu2node(handle, cpu, physid);
876
877         cpu_set(cpu, cpu_present_map);
878         ia64_cpu_to_sapicid[cpu] = physid;
879
880         *pcpu = cpu;
881         return (0);
882 }
883
884 EXPORT_SYMBOL(acpi_map_lsapic);
885
886 int acpi_unmap_lsapic(int cpu)
887 {
888         ia64_cpu_to_sapicid[cpu] = -1;
889         cpu_clear(cpu, cpu_present_map);
890
891 #ifdef CONFIG_ACPI_NUMA
892         /* NUMA specific cleanup's */
893 #endif
894
895         return (0);
896 }
897
898 EXPORT_SYMBOL(acpi_unmap_lsapic);
899 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
900
901 #ifdef CONFIG_ACPI_NUMA
902 static acpi_status __devinit
903 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
904 {
905         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
906         union acpi_object *obj;
907         struct acpi_madt_io_sapic *iosapic;
908         unsigned int gsi_base;
909         int pxm, node;
910
911         /* Only care about objects w/ a method that returns the MADT */
912         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
913                 return AE_OK;
914
915         if (!buffer.length || !buffer.pointer)
916                 return AE_OK;
917
918         obj = buffer.pointer;
919         if (obj->type != ACPI_TYPE_BUFFER ||
920             obj->buffer.length < sizeof(*iosapic)) {
921                 kfree(buffer.pointer);
922                 return AE_OK;
923         }
924
925         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
926
927         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
928                 kfree(buffer.pointer);
929                 return AE_OK;
930         }
931
932         gsi_base = iosapic->global_irq_base;
933
934         kfree(buffer.pointer);
935
936         /*
937          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
938          * us which node to associate this with.
939          */
940         pxm = acpi_get_pxm(handle);
941         if (pxm < 0)
942                 return AE_OK;
943
944         node = pxm_to_node(pxm);
945
946         if (node >= MAX_NUMNODES || !node_online(node) ||
947             cpus_empty(node_to_cpumask(node)))
948                 return AE_OK;
949
950         /* We know a gsi to node mapping! */
951         map_iosapic_to_node(gsi_base, node);
952         return AE_OK;
953 }
954
955 static int __init
956 acpi_map_iosapics (void)
957 {
958         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
959         return 0;
960 }
961
962 fs_initcall(acpi_map_iosapics);
963 #endif                          /* CONFIG_ACPI_NUMA */
964
965 int acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
966 {
967         int err;
968
969         if ((err = iosapic_init(phys_addr, gsi_base)))
970                 return err;
971
972 #ifdef CONFIG_ACPI_NUMA
973         acpi_map_iosapic(handle, 0, NULL, NULL);
974 #endif                          /* CONFIG_ACPI_NUMA */
975
976         return 0;
977 }
978
979 EXPORT_SYMBOL(acpi_register_ioapic);
980
981 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
982 {
983         return iosapic_remove(gsi_base);
984 }
985
986 EXPORT_SYMBOL(acpi_unregister_ioapic);
987
988 #endif                          /* CONFIG_ACPI */