Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm...
[linux-2.6.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 <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/numa.h>
54 #include <asm/sal.h>
55 #include <asm/cyclone.h>
56 #include <asm/xen/hypervisor.h>
57
58 #define BAD_MADT_ENTRY(entry, end) (                                        \
59                 (!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
60                 ((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
61
62 #define PREFIX                  "ACPI: "
63
64 u32 acpi_rsdt_forced;
65 unsigned int acpi_cpei_override;
66 unsigned int acpi_cpei_phys_cpuid;
67
68 unsigned long acpi_wakeup_address = 0;
69
70 #ifdef CONFIG_IA64_GENERIC
71 static unsigned long __init acpi_find_rsdp(void)
72 {
73         unsigned long rsdp_phys = 0;
74
75         if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
76                 rsdp_phys = efi.acpi20;
77         else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
78                 printk(KERN_WARNING PREFIX
79                        "v1.0/r0.71 tables no longer supported\n");
80         return rsdp_phys;
81 }
82
83 const char __init *
84 acpi_get_sysname(void)
85 {
86         unsigned long rsdp_phys;
87         struct acpi_table_rsdp *rsdp;
88         struct acpi_table_xsdt *xsdt;
89         struct acpi_table_header *hdr;
90 #ifdef CONFIG_INTEL_IOMMU
91         u64 i, nentries;
92 #endif
93
94         rsdp_phys = acpi_find_rsdp();
95         if (!rsdp_phys) {
96                 printk(KERN_ERR
97                        "ACPI 2.0 RSDP not found, default to \"dig\"\n");
98                 return "dig";
99         }
100
101         rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
102         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
103                 printk(KERN_ERR
104                        "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
105                 return "dig";
106         }
107
108         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
109         hdr = &xsdt->header;
110         if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
111                 printk(KERN_ERR
112                        "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
113                 return "dig";
114         }
115
116         if (!strcmp(hdr->oem_id, "HP")) {
117                 return "hpzx1";
118         } else if (!strcmp(hdr->oem_id, "SGI")) {
119                 if (!strcmp(hdr->oem_table_id + 4, "UV"))
120                         return "uv";
121                 else
122                         return "sn2";
123         } else if (xen_pv_domain() && !strcmp(hdr->oem_id, "XEN")) {
124                 return "xen";
125         }
126
127 #ifdef CONFIG_INTEL_IOMMU
128         /* Look for Intel IOMMU */
129         nentries = (hdr->length - sizeof(*hdr)) /
130                          sizeof(xsdt->table_offset_entry[0]);
131         for (i = 0; i < nentries; i++) {
132                 hdr = __va(xsdt->table_offset_entry[i]);
133                 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
134                         sizeof(ACPI_SIG_DMAR) - 1) == 0)
135                         return "dig_vtd";
136         }
137 #endif
138
139         return "dig";
140 }
141 #endif /* CONFIG_IA64_GENERIC */
142
143 #define ACPI_MAX_PLATFORM_INTERRUPTS    256
144
145 /* Array to record platform interrupt vectors for generic interrupt routing. */
146 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
147         [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
148 };
149
150 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
151
152 /*
153  * Interrupt routing API for device drivers.  Provides interrupt vector for
154  * a generic platform event.  Currently only CPEI is implemented.
155  */
156 int acpi_request_vector(u32 int_type)
157 {
158         int vector = -1;
159
160         if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
161                 /* corrected platform error interrupt */
162                 vector = platform_intr_list[int_type];
163         } else
164                 printk(KERN_ERR
165                        "acpi_request_vector(): invalid interrupt type\n");
166         return vector;
167 }
168
169 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
170 {
171         return __va(phys_addr);
172 }
173
174 void __init __acpi_unmap_table(char *map, unsigned long size)
175 {
176 }
177
178 /* --------------------------------------------------------------------------
179                             Boot-time Table Parsing
180    -------------------------------------------------------------------------- */
181
182 static int available_cpus __initdata;
183 struct acpi_table_madt *acpi_madt __initdata;
184 static u8 has_8259;
185
186 static int __init
187 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
188                           const unsigned long end)
189 {
190         struct acpi_madt_local_apic_override *lapic;
191
192         lapic = (struct acpi_madt_local_apic_override *)header;
193
194         if (BAD_MADT_ENTRY(lapic, end))
195                 return -EINVAL;
196
197         if (lapic->address) {
198                 iounmap(ipi_base_addr);
199                 ipi_base_addr = ioremap(lapic->address, 0);
200         }
201         return 0;
202 }
203
204 static int __init
205 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
206 {
207         struct acpi_madt_local_sapic *lsapic;
208
209         lsapic = (struct acpi_madt_local_sapic *)header;
210
211         /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
212
213         if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
214 #ifdef CONFIG_SMP
215                 smp_boot_data.cpu_phys_id[available_cpus] =
216                     (lsapic->id << 8) | lsapic->eid;
217 #endif
218                 ++available_cpus;
219         }
220
221         total_cpus++;
222         return 0;
223 }
224
225 static int __init
226 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
227 {
228         struct acpi_madt_local_apic_nmi *lacpi_nmi;
229
230         lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
231
232         if (BAD_MADT_ENTRY(lacpi_nmi, end))
233                 return -EINVAL;
234
235         /* TBD: Support lapic_nmi entries */
236         return 0;
237 }
238
239 static int __init
240 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
241 {
242         struct acpi_madt_io_sapic *iosapic;
243
244         iosapic = (struct acpi_madt_io_sapic *)header;
245
246         if (BAD_MADT_ENTRY(iosapic, end))
247                 return -EINVAL;
248
249         return iosapic_init(iosapic->address, iosapic->global_irq_base);
250 }
251
252 static unsigned int __initdata acpi_madt_rev;
253
254 static int __init
255 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
256                         const unsigned long end)
257 {
258         struct acpi_madt_interrupt_source *plintsrc;
259         int vector;
260
261         plintsrc = (struct acpi_madt_interrupt_source *)header;
262
263         if (BAD_MADT_ENTRY(plintsrc, end))
264                 return -EINVAL;
265
266         /*
267          * Get vector assignment for this interrupt, set attributes,
268          * and program the IOSAPIC routing table.
269          */
270         vector = iosapic_register_platform_intr(plintsrc->type,
271                                                 plintsrc->global_irq,
272                                                 plintsrc->io_sapic_vector,
273                                                 plintsrc->eid,
274                                                 plintsrc->id,
275                                                 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
276                                                  ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
277                                                 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
278                                                 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
279                                                  ACPI_MADT_TRIGGER_EDGE) ?
280                                                 IOSAPIC_EDGE : IOSAPIC_LEVEL);
281
282         platform_intr_list[plintsrc->type] = vector;
283         if (acpi_madt_rev > 1) {
284                 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
285         }
286
287         /*
288          * Save the physical id, so we can check when its being removed
289          */
290         acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
291
292         return 0;
293 }
294
295 #ifdef CONFIG_HOTPLUG_CPU
296 unsigned int can_cpei_retarget(void)
297 {
298         extern int cpe_vector;
299         extern unsigned int force_cpei_retarget;
300
301         /*
302          * Only if CPEI is supported and the override flag
303          * is present, otherwise return that its re-targettable
304          * if we are in polling mode.
305          */
306         if (cpe_vector > 0) {
307                 if (acpi_cpei_override || force_cpei_retarget)
308                         return 1;
309                 else
310                         return 0;
311         }
312         return 1;
313 }
314
315 unsigned int is_cpu_cpei_target(unsigned int cpu)
316 {
317         unsigned int logical_id;
318
319         logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
320
321         if (logical_id == cpu)
322                 return 1;
323         else
324                 return 0;
325 }
326
327 void set_cpei_target_cpu(unsigned int cpu)
328 {
329         acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
330 }
331 #endif
332
333 unsigned int get_cpei_target_cpu(void)
334 {
335         return acpi_cpei_phys_cpuid;
336 }
337
338 static int __init
339 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
340                        const unsigned long end)
341 {
342         struct acpi_madt_interrupt_override *p;
343
344         p = (struct acpi_madt_interrupt_override *)header;
345
346         if (BAD_MADT_ENTRY(p, end))
347                 return -EINVAL;
348
349         iosapic_override_isa_irq(p->source_irq, p->global_irq,
350                                  ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
351                                   ACPI_MADT_POLARITY_ACTIVE_LOW) ?
352                                  IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
353                                  ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
354                                  ACPI_MADT_TRIGGER_LEVEL) ?
355                                  IOSAPIC_LEVEL : IOSAPIC_EDGE);
356         return 0;
357 }
358
359 static int __init
360 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
361 {
362         struct acpi_madt_nmi_source *nmi_src;
363
364         nmi_src = (struct acpi_madt_nmi_source *)header;
365
366         if (BAD_MADT_ENTRY(nmi_src, end))
367                 return -EINVAL;
368
369         /* TBD: Support nimsrc entries */
370         return 0;
371 }
372
373 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
374 {
375         if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
376
377                 /*
378                  * Unfortunately ITC_DRIFT is not yet part of the
379                  * official SAL spec, so the ITC_DRIFT bit is not
380                  * set by the BIOS on this hardware.
381                  */
382                 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
383
384                 cyclone_setup();
385         }
386 }
387
388 static int __init acpi_parse_madt(struct acpi_table_header *table)
389 {
390         if (!table)
391                 return -EINVAL;
392
393         acpi_madt = (struct acpi_table_madt *)table;
394
395         acpi_madt_rev = acpi_madt->header.revision;
396
397         /* remember the value for reference after free_initmem() */
398 #ifdef CONFIG_ITANIUM
399         has_8259 = 1;           /* Firmware on old Itanium systems is broken */
400 #else
401         has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
402 #endif
403         iosapic_system_init(has_8259);
404
405         /* Get base address of IPI Message Block */
406
407         if (acpi_madt->address)
408                 ipi_base_addr = ioremap(acpi_madt->address, 0);
409
410         printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
411
412         acpi_madt_oem_check(acpi_madt->header.oem_id,
413                             acpi_madt->header.oem_table_id);
414
415         return 0;
416 }
417
418 #ifdef CONFIG_ACPI_NUMA
419
420 #undef SLIT_DEBUG
421
422 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
423
424 static int __initdata srat_num_cpus;    /* number of cpus */
425 static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
426 #define pxm_bit_set(bit)        (set_bit(bit,(void *)pxm_flag))
427 #define pxm_bit_test(bit)       (test_bit(bit,(void *)pxm_flag))
428 static struct acpi_table_slit __initdata *slit_table;
429 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
430
431 static int __init
432 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") || acpi_srat_revision >= 2)
438                 pxm += pa->proximity_domain_hi[0] << 8;
439         return pxm;
440 }
441
442 static int __init
443 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
444 {
445         int pxm;
446
447         pxm = ma->proximity_domain;
448         if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
449                 pxm &= 0xff;
450
451         return pxm;
452 }
453
454 /*
455  * ACPI 2.0 SLIT (System Locality Information Table)
456  * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
457  */
458 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
459 {
460         u32 len;
461
462         len = sizeof(struct acpi_table_header) + 8
463             + slit->locality_count * slit->locality_count;
464         if (slit->header.length != len) {
465                 printk(KERN_ERR
466                        "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
467                        len, slit->header.length);
468                 return;
469         }
470         slit_table = slit;
471 }
472
473 void __init
474 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
475 {
476         int pxm;
477
478         if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
479                 return;
480
481         if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
482                 printk_once(KERN_WARNING
483                             "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
484                             ARRAY_SIZE(node_cpuid));
485                 return;
486         }
487         pxm = get_processor_proximity_domain(pa);
488
489         /* record this node in proximity bitmap */
490         pxm_bit_set(pxm);
491
492         node_cpuid[srat_num_cpus].phys_id =
493             (pa->apic_id << 8) | (pa->local_sapic_eid);
494         /* nid should be overridden as logical node id later */
495         node_cpuid[srat_num_cpus].nid = pxm;
496         cpu_set(srat_num_cpus, early_cpu_possible_map);
497         srat_num_cpus++;
498 }
499
500 void __init
501 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
502 {
503         unsigned long paddr, size;
504         int pxm;
505         struct node_memblk_s *p, *q, *pend;
506
507         pxm = get_memory_proximity_domain(ma);
508
509         /* fill node memory chunk structure */
510         paddr = ma->base_address;
511         size = ma->length;
512
513         /* Ignore disabled entries */
514         if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
515                 return;
516
517         /* record this node in proximity bitmap */
518         pxm_bit_set(pxm);
519
520         /* Insertion sort based on base address */
521         pend = &node_memblk[num_node_memblks];
522         for (p = &node_memblk[0]; p < pend; p++) {
523                 if (paddr < p->start_paddr)
524                         break;
525         }
526         if (p < pend) {
527                 for (q = pend - 1; q >= p; q--)
528                         *(q + 1) = *q;
529         }
530         p->start_paddr = paddr;
531         p->size = size;
532         p->nid = pxm;
533         num_node_memblks++;
534 }
535
536 void __init acpi_numa_arch_fixup(void)
537 {
538         int i, j, node_from, node_to;
539
540         /* If there's no SRAT, fix the phys_id and mark node 0 online */
541         if (srat_num_cpus == 0) {
542                 node_set_online(0);
543                 node_cpuid[0].phys_id = hard_smp_processor_id();
544                 return;
545         }
546
547         /*
548          * MCD - This can probably be dropped now.  No need for pxm ID to node ID
549          * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
550          */
551         nodes_clear(node_online_map);
552         for (i = 0; i < MAX_PXM_DOMAINS; i++) {
553                 if (pxm_bit_test(i)) {
554                         int nid = acpi_map_pxm_to_node(i);
555                         node_set_online(nid);
556                 }
557         }
558
559         /* set logical node id in memory chunk structure */
560         for (i = 0; i < num_node_memblks; i++)
561                 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
562
563         /* assign memory bank numbers for each chunk on each node */
564         for_each_online_node(i) {
565                 int bank;
566
567                 bank = 0;
568                 for (j = 0; j < num_node_memblks; j++)
569                         if (node_memblk[j].nid == i)
570                                 node_memblk[j].bank = bank++;
571         }
572
573         /* set logical node id in cpu structure */
574         for_each_possible_early_cpu(i)
575                 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
576
577         printk(KERN_INFO "Number of logical nodes in system = %d\n",
578                num_online_nodes());
579         printk(KERN_INFO "Number of memory chunks in system = %d\n",
580                num_node_memblks);
581
582         if (!slit_table) {
583                 for (i = 0; i < MAX_NUMNODES; i++)
584                         for (j = 0; j < MAX_NUMNODES; j++)
585                                 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
586                                                         REMOTE_DISTANCE;
587                 return;
588         }
589
590         memset(numa_slit, -1, sizeof(numa_slit));
591         for (i = 0; i < slit_table->locality_count; i++) {
592                 if (!pxm_bit_test(i))
593                         continue;
594                 node_from = pxm_to_node(i);
595                 for (j = 0; j < slit_table->locality_count; j++) {
596                         if (!pxm_bit_test(j))
597                                 continue;
598                         node_to = pxm_to_node(j);
599                         node_distance(node_from, node_to) =
600                             slit_table->entry[i * slit_table->locality_count + j];
601                 }
602         }
603
604 #ifdef SLIT_DEBUG
605         printk("ACPI 2.0 SLIT locality table:\n");
606         for_each_online_node(i) {
607                 for_each_online_node(j)
608                     printk("%03d ", node_distance(i, j));
609                 printk("\n");
610         }
611 #endif
612 }
613 #endif                          /* CONFIG_ACPI_NUMA */
614
615 /*
616  * success: return IRQ number (>=0)
617  * failure: return < 0
618  */
619 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
620 {
621         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
622                 return gsi;
623
624         if (has_8259 && gsi < 16)
625                 return isa_irq_to_vector(gsi);
626
627         return iosapic_register_intr(gsi,
628                                      (polarity ==
629                                       ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
630                                      IOSAPIC_POL_LOW,
631                                      (triggering ==
632                                       ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
633                                      IOSAPIC_LEVEL);
634 }
635
636 void acpi_unregister_gsi(u32 gsi)
637 {
638         if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
639                 return;
640
641         if (has_8259 && gsi < 16)
642                 return;
643
644         iosapic_unregister_intr(gsi);
645 }
646
647 static int __init acpi_parse_fadt(struct acpi_table_header *table)
648 {
649         struct acpi_table_header *fadt_header;
650         struct acpi_table_fadt *fadt;
651
652         if (!table)
653                 return -EINVAL;
654
655         fadt_header = (struct acpi_table_header *)table;
656         if (fadt_header->revision != 3)
657                 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
658
659         fadt = (struct acpi_table_fadt *)fadt_header;
660
661         acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
662                                  ACPI_ACTIVE_LOW);
663         return 0;
664 }
665
666 int __init early_acpi_boot_init(void)
667 {
668         int ret;
669
670         /*
671          * do a partial walk of MADT to determine how many CPUs
672          * we have including offline CPUs
673          */
674         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
675                 printk(KERN_ERR PREFIX "Can't find MADT\n");
676                 return 0;
677         }
678
679         ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
680                 acpi_parse_lsapic, NR_CPUS);
681         if (ret < 1)
682                 printk(KERN_ERR PREFIX
683                        "Error parsing MADT - no LAPIC entries\n");
684
685 #ifdef CONFIG_SMP
686         if (available_cpus == 0) {
687                 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
688                 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
689                 smp_boot_data.cpu_phys_id[available_cpus] =
690                     hard_smp_processor_id();
691                 available_cpus = 1;     /* We've got at least one of these, no? */
692         }
693         smp_boot_data.cpu_count = available_cpus;
694 #endif
695         /* Make boot-up look pretty */
696         printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
697                total_cpus);
698
699         return 0;
700 }
701
702 int __init acpi_boot_init(void)
703 {
704
705         /*
706          * MADT
707          * ----
708          * Parse the Multiple APIC Description Table (MADT), if exists.
709          * Note that this table provides platform SMP configuration
710          * information -- the successor to MPS tables.
711          */
712
713         if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
714                 printk(KERN_ERR PREFIX "Can't find MADT\n");
715                 goto skip_madt;
716         }
717
718         /* Local APIC */
719
720         if (acpi_table_parse_madt
721             (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
722                 printk(KERN_ERR PREFIX
723                        "Error parsing LAPIC address override entry\n");
724
725         if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
726             < 0)
727                 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
728
729         /* I/O APIC */
730
731         if (acpi_table_parse_madt
732             (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
733                 if (!ia64_platform_is("sn2"))
734                         printk(KERN_ERR PREFIX
735                                "Error parsing MADT - no IOSAPIC entries\n");
736         }
737
738         /* System-Level Interrupt Routing */
739
740         if (acpi_table_parse_madt
741             (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
742              ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
743                 printk(KERN_ERR PREFIX
744                        "Error parsing platform interrupt source entry\n");
745
746         if (acpi_table_parse_madt
747             (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
748                 printk(KERN_ERR PREFIX
749                        "Error parsing interrupt source overrides entry\n");
750
751         if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
752                 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
753       skip_madt:
754
755         /*
756          * FADT says whether a legacy keyboard controller is present.
757          * The FADT also contains an SCI_INT line, by which the system
758          * gets interrupts such as power and sleep buttons.  If it's not
759          * on a Legacy interrupt, it needs to be setup.
760          */
761         if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
762                 printk(KERN_ERR PREFIX "Can't find FADT\n");
763
764 #ifdef CONFIG_ACPI_NUMA
765 #ifdef CONFIG_SMP
766         if (srat_num_cpus == 0) {
767                 int cpu, i = 1;
768                 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
769                         if (smp_boot_data.cpu_phys_id[cpu] !=
770                             hard_smp_processor_id())
771                                 node_cpuid[i++].phys_id =
772                                     smp_boot_data.cpu_phys_id[cpu];
773         }
774 #endif
775         build_cpu_to_node_map();
776 #endif
777         return 0;
778 }
779
780 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
781 {
782         int tmp;
783
784         if (has_8259 && gsi < 16)
785                 *irq = isa_irq_to_vector(gsi);
786         else {
787                 tmp = gsi_to_irq(gsi);
788                 if (tmp == -1)
789                         return -1;
790                 *irq = tmp;
791         }
792         return 0;
793 }
794
795 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
796 {
797         if (isa_irq >= 16)
798                 return -1;
799         *gsi = isa_irq;
800         return 0;
801 }
802
803 /*
804  *  ACPI based hotplug CPU support
805  */
806 #ifdef CONFIG_ACPI_HOTPLUG_CPU
807 static __cpuinit
808 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
809 {
810 #ifdef CONFIG_ACPI_NUMA
811         int pxm_id;
812         int nid;
813
814         pxm_id = acpi_get_pxm(handle);
815         /*
816          * We don't have cpu-only-node hotadd. But if the system equips
817          * SRAT table, pxm is already found and node is ready.
818          * So, just pxm_to_nid(pxm) is OK.
819          * This code here is for the system which doesn't have full SRAT
820          * table for possible cpus.
821          */
822         nid = acpi_map_pxm_to_node(pxm_id);
823         node_cpuid[cpu].phys_id = physid;
824         node_cpuid[cpu].nid = nid;
825 #endif
826         return (0);
827 }
828
829 int additional_cpus __initdata = -1;
830
831 static __init int setup_additional_cpus(char *s)
832 {
833         if (s)
834                 additional_cpus = simple_strtol(s, NULL, 0);
835
836         return 0;
837 }
838
839 early_param("additional_cpus", setup_additional_cpus);
840
841 /*
842  * cpu_possible_map should be static, it cannot change as CPUs
843  * are onlined, or offlined. The reason is per-cpu data-structures
844  * are allocated by some modules at init time, and dont expect to
845  * do this dynamically on cpu arrival/departure.
846  * cpu_present_map on the other hand can change dynamically.
847  * In case when cpu_hotplug is not compiled, then we resort to current
848  * behaviour, which is cpu_possible == cpu_present.
849  * - Ashok Raj
850  *
851  * Three ways to find out the number of additional hotplug CPUs:
852  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
853  * - The user can overwrite it with additional_cpus=NUM
854  * - Otherwise don't reserve additional CPUs.
855  */
856 __init void prefill_possible_map(void)
857 {
858         int i;
859         int possible, disabled_cpus;
860
861         disabled_cpus = total_cpus - available_cpus;
862
863         if (additional_cpus == -1) {
864                 if (disabled_cpus > 0)
865                         additional_cpus = disabled_cpus;
866                 else
867                         additional_cpus = 0;
868         }
869
870         possible = available_cpus + additional_cpus;
871
872         if (possible > nr_cpu_ids)
873                 possible = nr_cpu_ids;
874
875         printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
876                 possible, max((possible - available_cpus), 0));
877
878         for (i = 0; i < possible; i++)
879                 set_cpu_possible(i, true);
880 }
881
882 static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu)
883 {
884         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
885         union acpi_object *obj;
886         struct acpi_madt_local_sapic *lsapic;
887         cpumask_t tmp_map;
888         int cpu, physid;
889
890         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
891                 return -EINVAL;
892
893         if (!buffer.length || !buffer.pointer)
894                 return -EINVAL;
895
896         obj = buffer.pointer;
897         if (obj->type != ACPI_TYPE_BUFFER)
898         {
899                 kfree(buffer.pointer);
900                 return -EINVAL;
901         }
902
903         lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
904
905         if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
906             (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
907                 kfree(buffer.pointer);
908                 return -EINVAL;
909         }
910
911         physid = ((lsapic->id << 8) | (lsapic->eid));
912
913         kfree(buffer.pointer);
914         buffer.length = ACPI_ALLOCATE_BUFFER;
915         buffer.pointer = NULL;
916
917         cpumask_complement(&tmp_map, cpu_present_mask);
918         cpu = cpumask_first(&tmp_map);
919         if (cpu >= nr_cpu_ids)
920                 return -EINVAL;
921
922         acpi_map_cpu2node(handle, cpu, physid);
923
924         cpu_set(cpu, cpu_present_map);
925         ia64_cpu_to_sapicid[cpu] = physid;
926
927         acpi_processor_set_pdc(handle);
928
929         *pcpu = cpu;
930         return (0);
931 }
932
933 /* wrapper to silence section mismatch warning */
934 int __ref acpi_map_lsapic(acpi_handle handle, int *pcpu)
935 {
936         return _acpi_map_lsapic(handle, pcpu);
937 }
938 EXPORT_SYMBOL(acpi_map_lsapic);
939
940 int acpi_unmap_lsapic(int cpu)
941 {
942         ia64_cpu_to_sapicid[cpu] = -1;
943         cpu_clear(cpu, cpu_present_map);
944
945 #ifdef CONFIG_ACPI_NUMA
946         /* NUMA specific cleanup's */
947 #endif
948
949         return (0);
950 }
951
952 EXPORT_SYMBOL(acpi_unmap_lsapic);
953 #endif                          /* CONFIG_ACPI_HOTPLUG_CPU */
954
955 #ifdef CONFIG_ACPI_NUMA
956 static acpi_status __devinit
957 acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
958 {
959         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
960         union acpi_object *obj;
961         struct acpi_madt_io_sapic *iosapic;
962         unsigned int gsi_base;
963         int pxm, node;
964
965         /* Only care about objects w/ a method that returns the MADT */
966         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
967                 return AE_OK;
968
969         if (!buffer.length || !buffer.pointer)
970                 return AE_OK;
971
972         obj = buffer.pointer;
973         if (obj->type != ACPI_TYPE_BUFFER ||
974             obj->buffer.length < sizeof(*iosapic)) {
975                 kfree(buffer.pointer);
976                 return AE_OK;
977         }
978
979         iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
980
981         if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
982                 kfree(buffer.pointer);
983                 return AE_OK;
984         }
985
986         gsi_base = iosapic->global_irq_base;
987
988         kfree(buffer.pointer);
989
990         /*
991          * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
992          * us which node to associate this with.
993          */
994         pxm = acpi_get_pxm(handle);
995         if (pxm < 0)
996                 return AE_OK;
997
998         node = pxm_to_node(pxm);
999
1000         if (node >= MAX_NUMNODES || !node_online(node) ||
1001             cpumask_empty(cpumask_of_node(node)))
1002                 return AE_OK;
1003
1004         /* We know a gsi to node mapping! */
1005         map_iosapic_to_node(gsi_base, node);
1006         return AE_OK;
1007 }
1008
1009 static int __init
1010 acpi_map_iosapics (void)
1011 {
1012         acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
1013         return 0;
1014 }
1015
1016 fs_initcall(acpi_map_iosapics);
1017 #endif                          /* CONFIG_ACPI_NUMA */
1018
1019 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
1020 {
1021         int err;
1022
1023         if ((err = iosapic_init(phys_addr, gsi_base)))
1024                 return err;
1025
1026 #ifdef CONFIG_ACPI_NUMA
1027         acpi_map_iosapic(handle, 0, NULL, NULL);
1028 #endif                          /* CONFIG_ACPI_NUMA */
1029
1030         return 0;
1031 }
1032
1033 EXPORT_SYMBOL(acpi_register_ioapic);
1034
1035 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
1036 {
1037         return iosapic_remove(gsi_base);
1038 }
1039
1040 EXPORT_SYMBOL(acpi_unregister_ioapic);
1041
1042 /*
1043  * acpi_suspend_lowlevel() - save kernel state and suspend.
1044  *
1045  * TBD when when IA64 starts to support suspend...
1046  */
1047 int acpi_suspend_lowlevel(void) { return 0; }