arm64: dts: Revert "specify console via command line"
[linux/fpc-iii.git] / arch / ia64 / kernel / acpi.c
bloba5636524af7693a5f7900c3e92f87a31d9e0323c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * acpi.c - Architecture-Specific Low-Level ACPI Support
5 * Copyright (C) 1999 VA Linux Systems
6 * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
7 * Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 * Copyright (C) 2000 Intel Corp.
10 * Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
11 * Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
12 * Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
13 * Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
14 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
15 * Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/smp.h>
23 #include <linux/string.h>
24 #include <linux/types.h>
25 #include <linux/irq.h>
26 #include <linux/acpi.h>
27 #include <linux/efi.h>
28 #include <linux/mmzone.h>
29 #include <linux/nodemask.h>
30 #include <linux/slab.h>
31 #include <acpi/processor.h>
32 #include <asm/io.h>
33 #include <asm/iosapic.h>
34 #include <asm/page.h>
35 #include <asm/numa.h>
36 #include <asm/sal.h>
37 #include <asm/cyclone.h>
39 #define PREFIX "ACPI: "
41 int acpi_lapic;
42 unsigned int acpi_cpei_override;
43 unsigned int acpi_cpei_phys_cpuid;
45 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
47 /* Array to record platform interrupt vectors for generic interrupt routing. */
48 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
49 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
52 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
55 * Interrupt routing API for device drivers. Provides interrupt vector for
56 * a generic platform event. Currently only CPEI is implemented.
58 int acpi_request_vector(u32 int_type)
60 int vector = -1;
62 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
63 /* corrected platform error interrupt */
64 vector = platform_intr_list[int_type];
65 } else
66 printk(KERN_ERR
67 "acpi_request_vector(): invalid interrupt type\n");
68 return vector;
71 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
73 return __va(phys);
76 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
80 /* --------------------------------------------------------------------------
81 Boot-time Table Parsing
82 -------------------------------------------------------------------------- */
84 static int available_cpus __initdata;
85 struct acpi_table_madt *acpi_madt __initdata;
86 static u8 has_8259;
88 static int __init
89 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
90 const unsigned long end)
92 struct acpi_madt_local_apic_override *lapic;
94 lapic = (struct acpi_madt_local_apic_override *)header;
96 if (BAD_MADT_ENTRY(lapic, end))
97 return -EINVAL;
99 if (lapic->address) {
100 iounmap(ipi_base_addr);
101 ipi_base_addr = ioremap(lapic->address, 0);
103 return 0;
106 static int __init
107 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
109 struct acpi_madt_local_sapic *lsapic;
111 lsapic = (struct acpi_madt_local_sapic *)header;
113 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
115 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
116 #ifdef CONFIG_SMP
117 smp_boot_data.cpu_phys_id[available_cpus] =
118 (lsapic->id << 8) | lsapic->eid;
119 #endif
120 ++available_cpus;
123 total_cpus++;
124 return 0;
127 static int __init
128 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
130 struct acpi_madt_local_apic_nmi *lacpi_nmi;
132 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
134 if (BAD_MADT_ENTRY(lacpi_nmi, end))
135 return -EINVAL;
137 /* TBD: Support lapic_nmi entries */
138 return 0;
141 static int __init
142 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
144 struct acpi_madt_io_sapic *iosapic;
146 iosapic = (struct acpi_madt_io_sapic *)header;
148 if (BAD_MADT_ENTRY(iosapic, end))
149 return -EINVAL;
151 return iosapic_init(iosapic->address, iosapic->global_irq_base);
154 static unsigned int __initdata acpi_madt_rev;
156 static int __init
157 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
158 const unsigned long end)
160 struct acpi_madt_interrupt_source *plintsrc;
161 int vector;
163 plintsrc = (struct acpi_madt_interrupt_source *)header;
165 if (BAD_MADT_ENTRY(plintsrc, end))
166 return -EINVAL;
169 * Get vector assignment for this interrupt, set attributes,
170 * and program the IOSAPIC routing table.
172 vector = iosapic_register_platform_intr(plintsrc->type,
173 plintsrc->global_irq,
174 plintsrc->io_sapic_vector,
175 plintsrc->eid,
176 plintsrc->id,
177 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
178 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
179 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
180 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
181 ACPI_MADT_TRIGGER_EDGE) ?
182 IOSAPIC_EDGE : IOSAPIC_LEVEL);
184 platform_intr_list[plintsrc->type] = vector;
185 if (acpi_madt_rev > 1) {
186 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
190 * Save the physical id, so we can check when its being removed
192 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
194 return 0;
197 #ifdef CONFIG_HOTPLUG_CPU
198 unsigned int can_cpei_retarget(void)
200 extern int cpe_vector;
201 extern unsigned int force_cpei_retarget;
204 * Only if CPEI is supported and the override flag
205 * is present, otherwise return that its re-targettable
206 * if we are in polling mode.
208 if (cpe_vector > 0) {
209 if (acpi_cpei_override || force_cpei_retarget)
210 return 1;
211 else
212 return 0;
214 return 1;
217 unsigned int is_cpu_cpei_target(unsigned int cpu)
219 unsigned int logical_id;
221 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
223 if (logical_id == cpu)
224 return 1;
225 else
226 return 0;
229 void set_cpei_target_cpu(unsigned int cpu)
231 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
233 #endif
235 unsigned int get_cpei_target_cpu(void)
237 return acpi_cpei_phys_cpuid;
240 static int __init
241 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
242 const unsigned long end)
244 struct acpi_madt_interrupt_override *p;
246 p = (struct acpi_madt_interrupt_override *)header;
248 if (BAD_MADT_ENTRY(p, end))
249 return -EINVAL;
251 iosapic_override_isa_irq(p->source_irq, p->global_irq,
252 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
253 ACPI_MADT_POLARITY_ACTIVE_LOW) ?
254 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
255 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
256 ACPI_MADT_TRIGGER_LEVEL) ?
257 IOSAPIC_LEVEL : IOSAPIC_EDGE);
258 return 0;
261 static int __init
262 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
264 struct acpi_madt_nmi_source *nmi_src;
266 nmi_src = (struct acpi_madt_nmi_source *)header;
268 if (BAD_MADT_ENTRY(nmi_src, end))
269 return -EINVAL;
271 /* TBD: Support nimsrc entries */
272 return 0;
275 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
277 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
280 * Unfortunately ITC_DRIFT is not yet part of the
281 * official SAL spec, so the ITC_DRIFT bit is not
282 * set by the BIOS on this hardware.
284 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
286 cyclone_setup();
290 static int __init acpi_parse_madt(struct acpi_table_header *table)
292 acpi_madt = (struct acpi_table_madt *)table;
294 acpi_madt_rev = acpi_madt->header.revision;
296 /* remember the value for reference after free_initmem() */
297 #ifdef CONFIG_ITANIUM
298 has_8259 = 1; /* Firmware on old Itanium systems is broken */
299 #else
300 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
301 #endif
302 iosapic_system_init(has_8259);
304 /* Get base address of IPI Message Block */
306 if (acpi_madt->address)
307 ipi_base_addr = ioremap(acpi_madt->address, 0);
309 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
311 acpi_madt_oem_check(acpi_madt->header.oem_id,
312 acpi_madt->header.oem_table_id);
314 return 0;
317 #ifdef CONFIG_ACPI_NUMA
319 #undef SLIT_DEBUG
321 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
323 static int __initdata srat_num_cpus; /* number of cpus */
324 static u32 pxm_flag[PXM_FLAG_LEN];
325 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
326 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
327 static struct acpi_table_slit __initdata *slit_table;
328 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
330 static int __init
331 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
333 int pxm;
335 pxm = pa->proximity_domain_lo;
336 if (acpi_srat_revision >= 2)
337 pxm += pa->proximity_domain_hi[0] << 8;
338 return pxm;
341 static int __init
342 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
344 int pxm;
346 pxm = ma->proximity_domain;
347 if (acpi_srat_revision <= 1)
348 pxm &= 0xff;
350 return pxm;
354 * ACPI 2.0 SLIT (System Locality Information Table)
355 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
357 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
359 u32 len;
361 len = sizeof(struct acpi_table_header) + 8
362 + slit->locality_count * slit->locality_count;
363 if (slit->header.length != len) {
364 printk(KERN_ERR
365 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
366 len, slit->header.length);
367 return;
369 slit_table = slit;
372 void __init
373 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
375 int pxm;
377 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
378 return;
380 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
381 printk_once(KERN_WARNING
382 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
383 ARRAY_SIZE(node_cpuid));
384 return;
386 pxm = get_processor_proximity_domain(pa);
388 /* record this node in proximity bitmap */
389 pxm_bit_set(pxm);
391 node_cpuid[srat_num_cpus].phys_id =
392 (pa->apic_id << 8) | (pa->local_sapic_eid);
393 /* nid should be overridden as logical node id later */
394 node_cpuid[srat_num_cpus].nid = pxm;
395 cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
396 srat_num_cpus++;
399 int __init
400 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
402 unsigned long paddr, size;
403 int pxm;
404 struct node_memblk_s *p, *q, *pend;
406 pxm = get_memory_proximity_domain(ma);
408 /* fill node memory chunk structure */
409 paddr = ma->base_address;
410 size = ma->length;
412 /* Ignore disabled entries */
413 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
414 return -1;
416 if (num_node_memblks >= NR_NODE_MEMBLKS) {
417 pr_err("NUMA: too many memblk ranges\n");
418 return -EINVAL;
421 /* record this node in proximity bitmap */
422 pxm_bit_set(pxm);
424 /* Insertion sort based on base address */
425 pend = &node_memblk[num_node_memblks];
426 for (p = &node_memblk[0]; p < pend; p++) {
427 if (paddr < p->start_paddr)
428 break;
430 if (p < pend) {
431 for (q = pend - 1; q >= p; q--)
432 *(q + 1) = *q;
434 p->start_paddr = paddr;
435 p->size = size;
436 p->nid = pxm;
437 num_node_memblks++;
438 return 0;
441 void __init acpi_numa_fixup(void)
443 int i, j, node_from, node_to;
445 /* If there's no SRAT, fix the phys_id and mark node 0 online */
446 if (srat_num_cpus == 0) {
447 node_set_online(0);
448 node_cpuid[0].phys_id = hard_smp_processor_id();
449 return;
453 * MCD - This can probably be dropped now. No need for pxm ID to node ID
454 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
456 nodes_clear(node_online_map);
457 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
458 if (pxm_bit_test(i)) {
459 int nid = acpi_map_pxm_to_node(i);
460 node_set_online(nid);
464 /* set logical node id in memory chunk structure */
465 for (i = 0; i < num_node_memblks; i++)
466 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
468 /* assign memory bank numbers for each chunk on each node */
469 for_each_online_node(i) {
470 int bank;
472 bank = 0;
473 for (j = 0; j < num_node_memblks; j++)
474 if (node_memblk[j].nid == i)
475 node_memblk[j].bank = bank++;
478 /* set logical node id in cpu structure */
479 for_each_possible_early_cpu(i)
480 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
482 printk(KERN_INFO "Number of logical nodes in system = %d\n",
483 num_online_nodes());
484 printk(KERN_INFO "Number of memory chunks in system = %d\n",
485 num_node_memblks);
487 if (!slit_table) {
488 for (i = 0; i < MAX_NUMNODES; i++)
489 for (j = 0; j < MAX_NUMNODES; j++)
490 slit_distance(i, j) = i == j ?
491 LOCAL_DISTANCE : REMOTE_DISTANCE;
492 return;
495 memset(numa_slit, -1, sizeof(numa_slit));
496 for (i = 0; i < slit_table->locality_count; i++) {
497 if (!pxm_bit_test(i))
498 continue;
499 node_from = pxm_to_node(i);
500 for (j = 0; j < slit_table->locality_count; j++) {
501 if (!pxm_bit_test(j))
502 continue;
503 node_to = pxm_to_node(j);
504 slit_distance(node_from, node_to) =
505 slit_table->entry[i * slit_table->locality_count + j];
509 #ifdef SLIT_DEBUG
510 printk("ACPI 2.0 SLIT locality table:\n");
511 for_each_online_node(i) {
512 for_each_online_node(j)
513 printk("%03d ", node_distance(i, j));
514 printk("\n");
516 #endif
518 #endif /* CONFIG_ACPI_NUMA */
521 * success: return IRQ number (>=0)
522 * failure: return < 0
524 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
526 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
527 return gsi;
529 if (has_8259 && gsi < 16)
530 return isa_irq_to_vector(gsi);
532 return iosapic_register_intr(gsi,
533 (polarity ==
534 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
535 IOSAPIC_POL_LOW,
536 (triggering ==
537 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
538 IOSAPIC_LEVEL);
540 EXPORT_SYMBOL_GPL(acpi_register_gsi);
542 void acpi_unregister_gsi(u32 gsi)
544 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
545 return;
547 if (has_8259 && gsi < 16)
548 return;
550 iosapic_unregister_intr(gsi);
552 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
554 static int __init acpi_parse_fadt(struct acpi_table_header *table)
556 struct acpi_table_header *fadt_header;
557 struct acpi_table_fadt *fadt;
559 fadt_header = (struct acpi_table_header *)table;
560 if (fadt_header->revision != 3)
561 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
563 fadt = (struct acpi_table_fadt *)fadt_header;
565 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
566 ACPI_ACTIVE_LOW);
567 return 0;
570 int __init early_acpi_boot_init(void)
572 int ret;
575 * do a partial walk of MADT to determine how many CPUs
576 * we have including offline CPUs
578 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
579 printk(KERN_ERR PREFIX "Can't find MADT\n");
580 return 0;
583 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
584 acpi_parse_lsapic, NR_CPUS);
585 if (ret < 1)
586 printk(KERN_ERR PREFIX
587 "Error parsing MADT - no LAPIC entries\n");
588 else
589 acpi_lapic = 1;
591 #ifdef CONFIG_SMP
592 if (available_cpus == 0) {
593 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
594 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
595 smp_boot_data.cpu_phys_id[available_cpus] =
596 hard_smp_processor_id();
597 available_cpus = 1; /* We've got at least one of these, no? */
599 smp_boot_data.cpu_count = available_cpus;
600 #endif
601 /* Make boot-up look pretty */
602 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
603 total_cpus);
605 return 0;
608 int __init acpi_boot_init(void)
612 * MADT
613 * ----
614 * Parse the Multiple APIC Description Table (MADT), if exists.
615 * Note that this table provides platform SMP configuration
616 * information -- the successor to MPS tables.
619 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
620 printk(KERN_ERR PREFIX "Can't find MADT\n");
621 goto skip_madt;
624 /* Local APIC */
626 if (acpi_table_parse_madt
627 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
628 printk(KERN_ERR PREFIX
629 "Error parsing LAPIC address override entry\n");
631 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
632 < 0)
633 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
635 /* I/O APIC */
637 if (acpi_table_parse_madt
638 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
639 printk(KERN_ERR PREFIX
640 "Error parsing MADT - no IOSAPIC entries\n");
643 /* System-Level Interrupt Routing */
645 if (acpi_table_parse_madt
646 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
647 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
648 printk(KERN_ERR PREFIX
649 "Error parsing platform interrupt source entry\n");
651 if (acpi_table_parse_madt
652 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
653 printk(KERN_ERR PREFIX
654 "Error parsing interrupt source overrides entry\n");
656 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
657 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
658 skip_madt:
661 * FADT says whether a legacy keyboard controller is present.
662 * The FADT also contains an SCI_INT line, by which the system
663 * gets interrupts such as power and sleep buttons. If it's not
664 * on a Legacy interrupt, it needs to be setup.
666 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
667 printk(KERN_ERR PREFIX "Can't find FADT\n");
669 #ifdef CONFIG_ACPI_NUMA
670 #ifdef CONFIG_SMP
671 if (srat_num_cpus == 0) {
672 int cpu, i = 1;
673 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
674 if (smp_boot_data.cpu_phys_id[cpu] !=
675 hard_smp_processor_id())
676 node_cpuid[i++].phys_id =
677 smp_boot_data.cpu_phys_id[cpu];
679 #endif
680 build_cpu_to_node_map();
681 #endif
682 return 0;
685 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
687 int tmp;
689 if (has_8259 && gsi < 16)
690 *irq = isa_irq_to_vector(gsi);
691 else {
692 tmp = gsi_to_irq(gsi);
693 if (tmp == -1)
694 return -1;
695 *irq = tmp;
697 return 0;
700 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
702 if (isa_irq >= 16)
703 return -1;
704 *gsi = isa_irq;
705 return 0;
709 * ACPI based hotplug CPU support
711 #ifdef CONFIG_ACPI_HOTPLUG_CPU
712 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
714 #ifdef CONFIG_ACPI_NUMA
716 * We don't have cpu-only-node hotadd. But if the system equips
717 * SRAT table, pxm is already found and node is ready.
718 * So, just pxm_to_nid(pxm) is OK.
719 * This code here is for the system which doesn't have full SRAT
720 * table for possible cpus.
722 node_cpuid[cpu].phys_id = physid;
723 node_cpuid[cpu].nid = acpi_get_node(handle);
724 #endif
725 return 0;
728 int additional_cpus __initdata = -1;
730 static __init int setup_additional_cpus(char *s)
732 if (s)
733 additional_cpus = simple_strtol(s, NULL, 0);
735 return 0;
738 early_param("additional_cpus", setup_additional_cpus);
741 * cpu_possible_mask should be static, it cannot change as CPUs
742 * are onlined, or offlined. The reason is per-cpu data-structures
743 * are allocated by some modules at init time, and dont expect to
744 * do this dynamically on cpu arrival/departure.
745 * cpu_present_mask on the other hand can change dynamically.
746 * In case when cpu_hotplug is not compiled, then we resort to current
747 * behaviour, which is cpu_possible == cpu_present.
748 * - Ashok Raj
750 * Three ways to find out the number of additional hotplug CPUs:
751 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
752 * - The user can overwrite it with additional_cpus=NUM
753 * - Otherwise don't reserve additional CPUs.
755 __init void prefill_possible_map(void)
757 int i;
758 int possible, disabled_cpus;
760 disabled_cpus = total_cpus - available_cpus;
762 if (additional_cpus == -1) {
763 if (disabled_cpus > 0)
764 additional_cpus = disabled_cpus;
765 else
766 additional_cpus = 0;
769 possible = available_cpus + additional_cpus;
771 if (possible > nr_cpu_ids)
772 possible = nr_cpu_ids;
774 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
775 possible, max((possible - available_cpus), 0));
777 for (i = 0; i < possible; i++)
778 set_cpu_possible(i, true);
781 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
783 cpumask_t tmp_map;
784 int cpu;
786 cpumask_complement(&tmp_map, cpu_present_mask);
787 cpu = cpumask_first(&tmp_map);
788 if (cpu >= nr_cpu_ids)
789 return -EINVAL;
791 acpi_map_cpu2node(handle, cpu, physid);
793 set_cpu_present(cpu, true);
794 ia64_cpu_to_sapicid[cpu] = physid;
796 acpi_processor_set_pdc(handle);
798 *pcpu = cpu;
799 return (0);
802 /* wrapper to silence section mismatch warning */
803 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
804 int *pcpu)
806 return _acpi_map_lsapic(handle, physid, pcpu);
808 EXPORT_SYMBOL(acpi_map_cpu);
810 int acpi_unmap_cpu(int cpu)
812 ia64_cpu_to_sapicid[cpu] = -1;
813 set_cpu_present(cpu, false);
815 #ifdef CONFIG_ACPI_NUMA
816 /* NUMA specific cleanup's */
817 #endif
819 return (0);
821 EXPORT_SYMBOL(acpi_unmap_cpu);
822 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
824 #ifdef CONFIG_ACPI_NUMA
825 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
826 void *context, void **ret)
828 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
829 union acpi_object *obj;
830 struct acpi_madt_io_sapic *iosapic;
831 unsigned int gsi_base;
832 int node;
834 /* Only care about objects w/ a method that returns the MADT */
835 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
836 return AE_OK;
838 if (!buffer.length || !buffer.pointer)
839 return AE_OK;
841 obj = buffer.pointer;
842 if (obj->type != ACPI_TYPE_BUFFER ||
843 obj->buffer.length < sizeof(*iosapic)) {
844 kfree(buffer.pointer);
845 return AE_OK;
848 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
850 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
851 kfree(buffer.pointer);
852 return AE_OK;
855 gsi_base = iosapic->global_irq_base;
857 kfree(buffer.pointer);
859 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
860 node = acpi_get_node(handle);
861 if (node == NUMA_NO_NODE || !node_online(node) ||
862 cpumask_empty(cpumask_of_node(node)))
863 return AE_OK;
865 /* We know a gsi to node mapping! */
866 map_iosapic_to_node(gsi_base, node);
867 return AE_OK;
870 static int __init
871 acpi_map_iosapics (void)
873 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
874 return 0;
877 fs_initcall(acpi_map_iosapics);
878 #endif /* CONFIG_ACPI_NUMA */
880 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
882 int err;
884 if ((err = iosapic_init(phys_addr, gsi_base)))
885 return err;
887 #ifdef CONFIG_ACPI_NUMA
888 acpi_map_iosapic(handle, 0, NULL, NULL);
889 #endif /* CONFIG_ACPI_NUMA */
891 return 0;
894 EXPORT_SYMBOL(acpi_register_ioapic);
896 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
898 return iosapic_remove(gsi_base);
901 EXPORT_SYMBOL(acpi_unregister_ioapic);
904 * acpi_suspend_lowlevel() - save kernel state and suspend.
906 * TBD when when IA64 starts to support suspend...
908 int acpi_suspend_lowlevel(void) { return 0; }