1 // SPDX-License-Identifier: GPL-2.0-or-later
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>
33 #include <asm/iosapic.h>
34 #include <asm/machvec.h>
38 #include <asm/cyclone.h>
40 #define PREFIX "ACPI: "
43 unsigned int acpi_cpei_override;
44 unsigned int acpi_cpei_phys_cpuid;
46 unsigned long acpi_wakeup_address = 0;
48 #ifdef CONFIG_IA64_GENERIC
49 static unsigned long __init acpi_find_rsdp(void)
51 unsigned long rsdp_phys = 0;
53 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
54 rsdp_phys = efi.acpi20;
55 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
56 printk(KERN_WARNING PREFIX
57 "v1.0/r0.71 tables no longer supported\n");
62 acpi_get_sysname(void)
64 unsigned long rsdp_phys;
65 struct acpi_table_rsdp *rsdp;
66 struct acpi_table_xsdt *xsdt;
67 struct acpi_table_header *hdr;
68 #ifdef CONFIG_INTEL_IOMMU
72 rsdp_phys = acpi_find_rsdp();
75 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
79 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
80 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
82 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
86 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
88 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
90 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
94 if (!strcmp(hdr->oem_id, "HP")) {
96 } else if (!strcmp(hdr->oem_id, "SGI")) {
97 if (!strcmp(hdr->oem_table_id + 4, "UV"))
103 #ifdef CONFIG_INTEL_IOMMU
104 /* Look for Intel IOMMU */
105 nentries = (hdr->length - sizeof(*hdr)) /
106 sizeof(xsdt->table_offset_entry[0]);
107 for (i = 0; i < nentries; i++) {
108 hdr = __va(xsdt->table_offset_entry[i]);
109 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
110 sizeof(ACPI_SIG_DMAR) - 1) == 0)
117 #endif /* CONFIG_IA64_GENERIC */
119 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
121 /* Array to record platform interrupt vectors for generic interrupt routing. */
122 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
123 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
126 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
129 * Interrupt routing API for device drivers. Provides interrupt vector for
130 * a generic platform event. Currently only CPEI is implemented.
132 int acpi_request_vector(u32 int_type)
136 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
137 /* corrected platform error interrupt */
138 vector = platform_intr_list[int_type];
141 "acpi_request_vector(): invalid interrupt type\n");
145 void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
150 void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
154 /* --------------------------------------------------------------------------
155 Boot-time Table Parsing
156 -------------------------------------------------------------------------- */
158 static int available_cpus __initdata;
159 struct acpi_table_madt *acpi_madt __initdata;
163 acpi_parse_lapic_addr_ovr(union acpi_subtable_headers * header,
164 const unsigned long end)
166 struct acpi_madt_local_apic_override *lapic;
168 lapic = (struct acpi_madt_local_apic_override *)header;
170 if (BAD_MADT_ENTRY(lapic, end))
173 if (lapic->address) {
174 iounmap(ipi_base_addr);
175 ipi_base_addr = ioremap(lapic->address, 0);
181 acpi_parse_lsapic(union acpi_subtable_headers *header, const unsigned long end)
183 struct acpi_madt_local_sapic *lsapic;
185 lsapic = (struct acpi_madt_local_sapic *)header;
187 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
189 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
191 smp_boot_data.cpu_phys_id[available_cpus] =
192 (lsapic->id << 8) | lsapic->eid;
202 acpi_parse_lapic_nmi(union acpi_subtable_headers * header, const unsigned long end)
204 struct acpi_madt_local_apic_nmi *lacpi_nmi;
206 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
208 if (BAD_MADT_ENTRY(lacpi_nmi, end))
211 /* TBD: Support lapic_nmi entries */
216 acpi_parse_iosapic(union acpi_subtable_headers * header, const unsigned long end)
218 struct acpi_madt_io_sapic *iosapic;
220 iosapic = (struct acpi_madt_io_sapic *)header;
222 if (BAD_MADT_ENTRY(iosapic, end))
225 return iosapic_init(iosapic->address, iosapic->global_irq_base);
228 static unsigned int __initdata acpi_madt_rev;
231 acpi_parse_plat_int_src(union acpi_subtable_headers * header,
232 const unsigned long end)
234 struct acpi_madt_interrupt_source *plintsrc;
237 plintsrc = (struct acpi_madt_interrupt_source *)header;
239 if (BAD_MADT_ENTRY(plintsrc, end))
243 * Get vector assignment for this interrupt, set attributes,
244 * and program the IOSAPIC routing table.
246 vector = iosapic_register_platform_intr(plintsrc->type,
247 plintsrc->global_irq,
248 plintsrc->io_sapic_vector,
251 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
252 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
253 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
254 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
255 ACPI_MADT_TRIGGER_EDGE) ?
256 IOSAPIC_EDGE : IOSAPIC_LEVEL);
258 platform_intr_list[plintsrc->type] = vector;
259 if (acpi_madt_rev > 1) {
260 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
264 * Save the physical id, so we can check when its being removed
266 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
271 #ifdef CONFIG_HOTPLUG_CPU
272 unsigned int can_cpei_retarget(void)
274 extern int cpe_vector;
275 extern unsigned int force_cpei_retarget;
278 * Only if CPEI is supported and the override flag
279 * is present, otherwise return that its re-targettable
280 * if we are in polling mode.
282 if (cpe_vector > 0) {
283 if (acpi_cpei_override || force_cpei_retarget)
291 unsigned int is_cpu_cpei_target(unsigned int cpu)
293 unsigned int logical_id;
295 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
297 if (logical_id == cpu)
303 void set_cpei_target_cpu(unsigned int cpu)
305 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
309 unsigned int get_cpei_target_cpu(void)
311 return acpi_cpei_phys_cpuid;
315 acpi_parse_int_src_ovr(union acpi_subtable_headers * header,
316 const unsigned long end)
318 struct acpi_madt_interrupt_override *p;
320 p = (struct acpi_madt_interrupt_override *)header;
322 if (BAD_MADT_ENTRY(p, end))
325 iosapic_override_isa_irq(p->source_irq, p->global_irq,
326 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
327 ACPI_MADT_POLARITY_ACTIVE_LOW) ?
328 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
329 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
330 ACPI_MADT_TRIGGER_LEVEL) ?
331 IOSAPIC_LEVEL : IOSAPIC_EDGE);
336 acpi_parse_nmi_src(union acpi_subtable_headers * header, const unsigned long end)
338 struct acpi_madt_nmi_source *nmi_src;
340 nmi_src = (struct acpi_madt_nmi_source *)header;
342 if (BAD_MADT_ENTRY(nmi_src, end))
345 /* TBD: Support nimsrc entries */
349 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
351 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
354 * Unfortunately ITC_DRIFT is not yet part of the
355 * official SAL spec, so the ITC_DRIFT bit is not
356 * set by the BIOS on this hardware.
358 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
364 static int __init acpi_parse_madt(struct acpi_table_header *table)
366 acpi_madt = (struct acpi_table_madt *)table;
368 acpi_madt_rev = acpi_madt->header.revision;
370 /* remember the value for reference after free_initmem() */
371 #ifdef CONFIG_ITANIUM
372 has_8259 = 1; /* Firmware on old Itanium systems is broken */
374 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
376 iosapic_system_init(has_8259);
378 /* Get base address of IPI Message Block */
380 if (acpi_madt->address)
381 ipi_base_addr = ioremap(acpi_madt->address, 0);
383 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
385 acpi_madt_oem_check(acpi_madt->header.oem_id,
386 acpi_madt->header.oem_table_id);
391 #ifdef CONFIG_ACPI_NUMA
395 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
397 static int __initdata srat_num_cpus; /* number of cpus */
398 static u32 pxm_flag[PXM_FLAG_LEN];
399 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
400 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
401 static struct acpi_table_slit __initdata *slit_table;
402 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
405 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
409 pxm = pa->proximity_domain_lo;
410 if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
411 pxm += pa->proximity_domain_hi[0] << 8;
416 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
420 pxm = ma->proximity_domain;
421 if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
428 * ACPI 2.0 SLIT (System Locality Information Table)
429 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
431 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
435 len = sizeof(struct acpi_table_header) + 8
436 + slit->locality_count * slit->locality_count;
437 if (slit->header.length != len) {
439 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
440 len, slit->header.length);
447 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
451 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
454 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
455 printk_once(KERN_WARNING
456 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
457 ARRAY_SIZE(node_cpuid));
460 pxm = get_processor_proximity_domain(pa);
462 /* record this node in proximity bitmap */
465 node_cpuid[srat_num_cpus].phys_id =
466 (pa->apic_id << 8) | (pa->local_sapic_eid);
467 /* nid should be overridden as logical node id later */
468 node_cpuid[srat_num_cpus].nid = pxm;
469 cpumask_set_cpu(srat_num_cpus, &early_cpu_possible_map);
474 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
476 unsigned long paddr, size;
478 struct node_memblk_s *p, *q, *pend;
480 pxm = get_memory_proximity_domain(ma);
482 /* fill node memory chunk structure */
483 paddr = ma->base_address;
486 /* Ignore disabled entries */
487 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
490 if (num_node_memblks >= NR_NODE_MEMBLKS) {
491 pr_err("NUMA: too many memblk ranges\n");
495 /* record this node in proximity bitmap */
498 /* Insertion sort based on base address */
499 pend = &node_memblk[num_node_memblks];
500 for (p = &node_memblk[0]; p < pend; p++) {
501 if (paddr < p->start_paddr)
505 for (q = pend - 1; q >= p; q--)
508 p->start_paddr = paddr;
515 void __init acpi_numa_fixup(void)
517 int i, j, node_from, node_to;
519 /* If there's no SRAT, fix the phys_id and mark node 0 online */
520 if (srat_num_cpus == 0) {
522 node_cpuid[0].phys_id = hard_smp_processor_id();
527 * MCD - This can probably be dropped now. No need for pxm ID to node ID
528 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
530 nodes_clear(node_online_map);
531 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
532 if (pxm_bit_test(i)) {
533 int nid = acpi_map_pxm_to_node(i);
534 node_set_online(nid);
538 /* set logical node id in memory chunk structure */
539 for (i = 0; i < num_node_memblks; i++)
540 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
542 /* assign memory bank numbers for each chunk on each node */
543 for_each_online_node(i) {
547 for (j = 0; j < num_node_memblks; j++)
548 if (node_memblk[j].nid == i)
549 node_memblk[j].bank = bank++;
552 /* set logical node id in cpu structure */
553 for_each_possible_early_cpu(i)
554 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
556 printk(KERN_INFO "Number of logical nodes in system = %d\n",
558 printk(KERN_INFO "Number of memory chunks in system = %d\n",
562 for (i = 0; i < MAX_NUMNODES; i++)
563 for (j = 0; j < MAX_NUMNODES; j++)
564 slit_distance(i, j) = i == j ?
565 LOCAL_DISTANCE : REMOTE_DISTANCE;
569 memset(numa_slit, -1, sizeof(numa_slit));
570 for (i = 0; i < slit_table->locality_count; i++) {
571 if (!pxm_bit_test(i))
573 node_from = pxm_to_node(i);
574 for (j = 0; j < slit_table->locality_count; j++) {
575 if (!pxm_bit_test(j))
577 node_to = pxm_to_node(j);
578 slit_distance(node_from, node_to) =
579 slit_table->entry[i * slit_table->locality_count + j];
584 printk("ACPI 2.0 SLIT locality table:\n");
585 for_each_online_node(i) {
586 for_each_online_node(j)
587 printk("%03d ", node_distance(i, j));
592 #endif /* CONFIG_ACPI_NUMA */
595 * success: return IRQ number (>=0)
596 * failure: return < 0
598 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
600 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
603 if (has_8259 && gsi < 16)
604 return isa_irq_to_vector(gsi);
606 return iosapic_register_intr(gsi,
608 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
611 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
614 EXPORT_SYMBOL_GPL(acpi_register_gsi);
616 void acpi_unregister_gsi(u32 gsi)
618 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
621 if (has_8259 && gsi < 16)
624 iosapic_unregister_intr(gsi);
626 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
628 static int __init acpi_parse_fadt(struct acpi_table_header *table)
630 struct acpi_table_header *fadt_header;
631 struct acpi_table_fadt *fadt;
633 fadt_header = (struct acpi_table_header *)table;
634 if (fadt_header->revision != 3)
635 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
637 fadt = (struct acpi_table_fadt *)fadt_header;
639 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
644 int __init early_acpi_boot_init(void)
649 * do a partial walk of MADT to determine how many CPUs
650 * we have including offline CPUs
652 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
653 printk(KERN_ERR PREFIX "Can't find MADT\n");
657 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
658 acpi_parse_lsapic, NR_CPUS);
660 printk(KERN_ERR PREFIX
661 "Error parsing MADT - no LAPIC entries\n");
666 if (available_cpus == 0) {
667 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
668 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
669 smp_boot_data.cpu_phys_id[available_cpus] =
670 hard_smp_processor_id();
671 available_cpus = 1; /* We've got at least one of these, no? */
673 smp_boot_data.cpu_count = available_cpus;
675 /* Make boot-up look pretty */
676 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
682 int __init acpi_boot_init(void)
688 * Parse the Multiple APIC Description Table (MADT), if exists.
689 * Note that this table provides platform SMP configuration
690 * information -- the successor to MPS tables.
693 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
694 printk(KERN_ERR PREFIX "Can't find MADT\n");
700 if (acpi_table_parse_madt
701 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
702 printk(KERN_ERR PREFIX
703 "Error parsing LAPIC address override entry\n");
705 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
707 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
711 if (acpi_table_parse_madt
712 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
713 if (!ia64_platform_is("sn2"))
714 printk(KERN_ERR PREFIX
715 "Error parsing MADT - no IOSAPIC entries\n");
718 /* System-Level Interrupt Routing */
720 if (acpi_table_parse_madt
721 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
722 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
723 printk(KERN_ERR PREFIX
724 "Error parsing platform interrupt source entry\n");
726 if (acpi_table_parse_madt
727 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
728 printk(KERN_ERR PREFIX
729 "Error parsing interrupt source overrides entry\n");
731 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
732 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
736 * FADT says whether a legacy keyboard controller is present.
737 * The FADT also contains an SCI_INT line, by which the system
738 * gets interrupts such as power and sleep buttons. If it's not
739 * on a Legacy interrupt, it needs to be setup.
741 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
742 printk(KERN_ERR PREFIX "Can't find FADT\n");
744 #ifdef CONFIG_ACPI_NUMA
746 if (srat_num_cpus == 0) {
748 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
749 if (smp_boot_data.cpu_phys_id[cpu] !=
750 hard_smp_processor_id())
751 node_cpuid[i++].phys_id =
752 smp_boot_data.cpu_phys_id[cpu];
755 build_cpu_to_node_map();
760 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
764 if (has_8259 && gsi < 16)
765 *irq = isa_irq_to_vector(gsi);
767 tmp = gsi_to_irq(gsi);
775 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
784 * ACPI based hotplug CPU support
786 #ifdef CONFIG_ACPI_HOTPLUG_CPU
787 int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
789 #ifdef CONFIG_ACPI_NUMA
791 * We don't have cpu-only-node hotadd. But if the system equips
792 * SRAT table, pxm is already found and node is ready.
793 * So, just pxm_to_nid(pxm) is OK.
794 * This code here is for the system which doesn't have full SRAT
795 * table for possible cpus.
797 node_cpuid[cpu].phys_id = physid;
798 node_cpuid[cpu].nid = acpi_get_node(handle);
803 int additional_cpus __initdata = -1;
805 static __init int setup_additional_cpus(char *s)
808 additional_cpus = simple_strtol(s, NULL, 0);
813 early_param("additional_cpus", setup_additional_cpus);
816 * cpu_possible_mask should be static, it cannot change as CPUs
817 * are onlined, or offlined. The reason is per-cpu data-structures
818 * are allocated by some modules at init time, and dont expect to
819 * do this dynamically on cpu arrival/departure.
820 * cpu_present_mask on the other hand can change dynamically.
821 * In case when cpu_hotplug is not compiled, then we resort to current
822 * behaviour, which is cpu_possible == cpu_present.
825 * Three ways to find out the number of additional hotplug CPUs:
826 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
827 * - The user can overwrite it with additional_cpus=NUM
828 * - Otherwise don't reserve additional CPUs.
830 __init void prefill_possible_map(void)
833 int possible, disabled_cpus;
835 disabled_cpus = total_cpus - available_cpus;
837 if (additional_cpus == -1) {
838 if (disabled_cpus > 0)
839 additional_cpus = disabled_cpus;
844 possible = available_cpus + additional_cpus;
846 if (possible > nr_cpu_ids)
847 possible = nr_cpu_ids;
849 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
850 possible, max((possible - available_cpus), 0));
852 for (i = 0; i < possible; i++)
853 set_cpu_possible(i, true);
856 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
861 cpumask_complement(&tmp_map, cpu_present_mask);
862 cpu = cpumask_first(&tmp_map);
863 if (cpu >= nr_cpu_ids)
866 acpi_map_cpu2node(handle, cpu, physid);
868 set_cpu_present(cpu, true);
869 ia64_cpu_to_sapicid[cpu] = physid;
871 acpi_processor_set_pdc(handle);
877 /* wrapper to silence section mismatch warning */
878 int __ref acpi_map_cpu(acpi_handle handle, phys_cpuid_t physid, u32 acpi_id,
881 return _acpi_map_lsapic(handle, physid, pcpu);
883 EXPORT_SYMBOL(acpi_map_cpu);
885 int acpi_unmap_cpu(int cpu)
887 ia64_cpu_to_sapicid[cpu] = -1;
888 set_cpu_present(cpu, false);
890 #ifdef CONFIG_ACPI_NUMA
891 /* NUMA specific cleanup's */
896 EXPORT_SYMBOL(acpi_unmap_cpu);
897 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
899 #ifdef CONFIG_ACPI_NUMA
900 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
901 void *context, void **ret)
903 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
904 union acpi_object *obj;
905 struct acpi_madt_io_sapic *iosapic;
906 unsigned int gsi_base;
909 /* Only care about objects w/ a method that returns the MADT */
910 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
913 if (!buffer.length || !buffer.pointer)
916 obj = buffer.pointer;
917 if (obj->type != ACPI_TYPE_BUFFER ||
918 obj->buffer.length < sizeof(*iosapic)) {
919 kfree(buffer.pointer);
923 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
925 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
926 kfree(buffer.pointer);
930 gsi_base = iosapic->global_irq_base;
932 kfree(buffer.pointer);
934 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
935 node = acpi_get_node(handle);
936 if (node == NUMA_NO_NODE || !node_online(node) ||
937 cpumask_empty(cpumask_of_node(node)))
940 /* We know a gsi to node mapping! */
941 map_iosapic_to_node(gsi_base, node);
946 acpi_map_iosapics (void)
948 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
952 fs_initcall(acpi_map_iosapics);
953 #endif /* CONFIG_ACPI_NUMA */
955 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
959 if ((err = iosapic_init(phys_addr, gsi_base)))
962 #ifdef CONFIG_ACPI_NUMA
963 acpi_map_iosapic(handle, 0, NULL, NULL);
964 #endif /* CONFIG_ACPI_NUMA */
969 EXPORT_SYMBOL(acpi_register_ioapic);
971 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
973 return iosapic_remove(gsi_base);
976 EXPORT_SYMBOL(acpi_unregister_ioapic);
979 * acpi_suspend_lowlevel() - save kernel state and suspend.
981 * TBD when when IA64 starts to support suspend...
983 int acpi_suspend_lowlevel(void) { return 0; }