2 * acpi.c - Architecture-Specific Low-Level ACPI Support
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>
16 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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
32 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
50 #include <asm/iosapic.h>
51 #include <asm/machvec.h>
55 #include <asm/cyclone.h>
57 #define PREFIX "ACPI: "
59 unsigned int acpi_cpei_override;
60 unsigned int acpi_cpei_phys_cpuid;
62 unsigned long acpi_wakeup_address = 0;
64 #ifdef CONFIG_IA64_GENERIC
65 static unsigned long __init acpi_find_rsdp(void)
67 unsigned long rsdp_phys = 0;
69 if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
70 rsdp_phys = efi.acpi20;
71 else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
72 printk(KERN_WARNING PREFIX
73 "v1.0/r0.71 tables no longer supported\n");
78 acpi_get_sysname(void)
80 unsigned long rsdp_phys;
81 struct acpi_table_rsdp *rsdp;
82 struct acpi_table_xsdt *xsdt;
83 struct acpi_table_header *hdr;
84 #ifdef CONFIG_INTEL_IOMMU
88 rsdp_phys = acpi_find_rsdp();
91 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
95 rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
96 if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
98 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
102 xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
104 if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
106 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
110 if (!strcmp(hdr->oem_id, "HP")) {
112 } else if (!strcmp(hdr->oem_id, "SGI")) {
113 if (!strcmp(hdr->oem_table_id + 4, "UV"))
119 #ifdef CONFIG_INTEL_IOMMU
120 /* Look for Intel IOMMU */
121 nentries = (hdr->length - sizeof(*hdr)) /
122 sizeof(xsdt->table_offset_entry[0]);
123 for (i = 0; i < nentries; i++) {
124 hdr = __va(xsdt->table_offset_entry[i]);
125 if (strncmp(hdr->signature, ACPI_SIG_DMAR,
126 sizeof(ACPI_SIG_DMAR) - 1) == 0)
133 #endif /* CONFIG_IA64_GENERIC */
135 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
137 /* Array to record platform interrupt vectors for generic interrupt routing. */
138 int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
139 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
142 enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
145 * Interrupt routing API for device drivers. Provides interrupt vector for
146 * a generic platform event. Currently only CPEI is implemented.
148 int acpi_request_vector(u32 int_type)
152 if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
153 /* corrected platform error interrupt */
154 vector = platform_intr_list[int_type];
157 "acpi_request_vector(): invalid interrupt type\n");
161 char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
163 return __va(phys_addr);
166 void __init __acpi_unmap_table(char *map, unsigned long size)
170 /* --------------------------------------------------------------------------
171 Boot-time Table Parsing
172 -------------------------------------------------------------------------- */
174 static int available_cpus __initdata;
175 struct acpi_table_madt *acpi_madt __initdata;
179 acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
180 const unsigned long end)
182 struct acpi_madt_local_apic_override *lapic;
184 lapic = (struct acpi_madt_local_apic_override *)header;
186 if (BAD_MADT_ENTRY(lapic, end))
189 if (lapic->address) {
190 iounmap(ipi_base_addr);
191 ipi_base_addr = ioremap(lapic->address, 0);
197 acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
199 struct acpi_madt_local_sapic *lsapic;
201 lsapic = (struct acpi_madt_local_sapic *)header;
203 /*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
205 if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
207 smp_boot_data.cpu_phys_id[available_cpus] =
208 (lsapic->id << 8) | lsapic->eid;
218 acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
220 struct acpi_madt_local_apic_nmi *lacpi_nmi;
222 lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
224 if (BAD_MADT_ENTRY(lacpi_nmi, end))
227 /* TBD: Support lapic_nmi entries */
232 acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
234 struct acpi_madt_io_sapic *iosapic;
236 iosapic = (struct acpi_madt_io_sapic *)header;
238 if (BAD_MADT_ENTRY(iosapic, end))
241 return iosapic_init(iosapic->address, iosapic->global_irq_base);
244 static unsigned int __initdata acpi_madt_rev;
247 acpi_parse_plat_int_src(struct acpi_subtable_header * header,
248 const unsigned long end)
250 struct acpi_madt_interrupt_source *plintsrc;
253 plintsrc = (struct acpi_madt_interrupt_source *)header;
255 if (BAD_MADT_ENTRY(plintsrc, end))
259 * Get vector assignment for this interrupt, set attributes,
260 * and program the IOSAPIC routing table.
262 vector = iosapic_register_platform_intr(plintsrc->type,
263 plintsrc->global_irq,
264 plintsrc->io_sapic_vector,
267 ((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
268 ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
269 IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
270 ((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
271 ACPI_MADT_TRIGGER_EDGE) ?
272 IOSAPIC_EDGE : IOSAPIC_LEVEL);
274 platform_intr_list[plintsrc->type] = vector;
275 if (acpi_madt_rev > 1) {
276 acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
280 * Save the physical id, so we can check when its being removed
282 acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
287 #ifdef CONFIG_HOTPLUG_CPU
288 unsigned int can_cpei_retarget(void)
290 extern int cpe_vector;
291 extern unsigned int force_cpei_retarget;
294 * Only if CPEI is supported and the override flag
295 * is present, otherwise return that its re-targettable
296 * if we are in polling mode.
298 if (cpe_vector > 0) {
299 if (acpi_cpei_override || force_cpei_retarget)
307 unsigned int is_cpu_cpei_target(unsigned int cpu)
309 unsigned int logical_id;
311 logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
313 if (logical_id == cpu)
319 void set_cpei_target_cpu(unsigned int cpu)
321 acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
325 unsigned int get_cpei_target_cpu(void)
327 return acpi_cpei_phys_cpuid;
331 acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
332 const unsigned long end)
334 struct acpi_madt_interrupt_override *p;
336 p = (struct acpi_madt_interrupt_override *)header;
338 if (BAD_MADT_ENTRY(p, end))
341 iosapic_override_isa_irq(p->source_irq, p->global_irq,
342 ((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
343 ACPI_MADT_POLARITY_ACTIVE_LOW) ?
344 IOSAPIC_POL_LOW : IOSAPIC_POL_HIGH,
345 ((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
346 ACPI_MADT_TRIGGER_LEVEL) ?
347 IOSAPIC_LEVEL : IOSAPIC_EDGE);
352 acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
354 struct acpi_madt_nmi_source *nmi_src;
356 nmi_src = (struct acpi_madt_nmi_source *)header;
358 if (BAD_MADT_ENTRY(nmi_src, end))
361 /* TBD: Support nimsrc entries */
365 static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
367 if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
370 * Unfortunately ITC_DRIFT is not yet part of the
371 * official SAL spec, so the ITC_DRIFT bit is not
372 * set by the BIOS on this hardware.
374 sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
380 static int __init acpi_parse_madt(struct acpi_table_header *table)
385 acpi_madt = (struct acpi_table_madt *)table;
387 acpi_madt_rev = acpi_madt->header.revision;
389 /* remember the value for reference after free_initmem() */
390 #ifdef CONFIG_ITANIUM
391 has_8259 = 1; /* Firmware on old Itanium systems is broken */
393 has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
395 iosapic_system_init(has_8259);
397 /* Get base address of IPI Message Block */
399 if (acpi_madt->address)
400 ipi_base_addr = ioremap(acpi_madt->address, 0);
402 printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
404 acpi_madt_oem_check(acpi_madt->header.oem_id,
405 acpi_madt->header.oem_table_id);
410 #ifdef CONFIG_ACPI_NUMA
414 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
416 static int __initdata srat_num_cpus; /* number of cpus */
417 static u32 pxm_flag[PXM_FLAG_LEN];
418 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
419 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
420 static struct acpi_table_slit __initdata *slit_table;
421 cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
424 get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
428 pxm = pa->proximity_domain_lo;
429 if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
430 pxm += pa->proximity_domain_hi[0] << 8;
435 get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
439 pxm = ma->proximity_domain;
440 if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
447 * ACPI 2.0 SLIT (System Locality Information Table)
448 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
450 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
454 len = sizeof(struct acpi_table_header) + 8
455 + slit->locality_count * slit->locality_count;
456 if (slit->header.length != len) {
458 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
459 len, slit->header.length);
466 acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
470 if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
473 if (srat_num_cpus >= ARRAY_SIZE(node_cpuid)) {
474 printk_once(KERN_WARNING
475 "node_cpuid[%ld] is too small, may not be able to use all cpus\n",
476 ARRAY_SIZE(node_cpuid));
479 pxm = get_processor_proximity_domain(pa);
481 /* record this node in proximity bitmap */
484 node_cpuid[srat_num_cpus].phys_id =
485 (pa->apic_id << 8) | (pa->local_sapic_eid);
486 /* nid should be overridden as logical node id later */
487 node_cpuid[srat_num_cpus].nid = pxm;
488 cpu_set(srat_num_cpus, early_cpu_possible_map);
493 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
495 unsigned long paddr, size;
497 struct node_memblk_s *p, *q, *pend;
499 pxm = get_memory_proximity_domain(ma);
501 /* fill node memory chunk structure */
502 paddr = ma->base_address;
505 /* Ignore disabled entries */
506 if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
509 /* record this node in proximity bitmap */
512 /* Insertion sort based on base address */
513 pend = &node_memblk[num_node_memblks];
514 for (p = &node_memblk[0]; p < pend; p++) {
515 if (paddr < p->start_paddr)
519 for (q = pend - 1; q >= p; q--)
522 p->start_paddr = paddr;
529 void __init acpi_numa_arch_fixup(void)
531 int i, j, node_from, node_to;
533 /* If there's no SRAT, fix the phys_id and mark node 0 online */
534 if (srat_num_cpus == 0) {
536 node_cpuid[0].phys_id = hard_smp_processor_id();
541 * MCD - This can probably be dropped now. No need for pxm ID to node ID
542 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
544 nodes_clear(node_online_map);
545 for (i = 0; i < MAX_PXM_DOMAINS; i++) {
546 if (pxm_bit_test(i)) {
547 int nid = acpi_map_pxm_to_node(i);
548 node_set_online(nid);
552 /* set logical node id in memory chunk structure */
553 for (i = 0; i < num_node_memblks; i++)
554 node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
556 /* assign memory bank numbers for each chunk on each node */
557 for_each_online_node(i) {
561 for (j = 0; j < num_node_memblks; j++)
562 if (node_memblk[j].nid == i)
563 node_memblk[j].bank = bank++;
566 /* set logical node id in cpu structure */
567 for_each_possible_early_cpu(i)
568 node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
570 printk(KERN_INFO "Number of logical nodes in system = %d\n",
572 printk(KERN_INFO "Number of memory chunks in system = %d\n",
576 for (i = 0; i < MAX_NUMNODES; i++)
577 for (j = 0; j < MAX_NUMNODES; j++)
578 node_distance(i, j) = i == j ? LOCAL_DISTANCE :
583 memset(numa_slit, -1, sizeof(numa_slit));
584 for (i = 0; i < slit_table->locality_count; i++) {
585 if (!pxm_bit_test(i))
587 node_from = pxm_to_node(i);
588 for (j = 0; j < slit_table->locality_count; j++) {
589 if (!pxm_bit_test(j))
591 node_to = pxm_to_node(j);
592 node_distance(node_from, node_to) =
593 slit_table->entry[i * slit_table->locality_count + j];
598 printk("ACPI 2.0 SLIT locality table:\n");
599 for_each_online_node(i) {
600 for_each_online_node(j)
601 printk("%03d ", node_distance(i, j));
606 #endif /* CONFIG_ACPI_NUMA */
609 * success: return IRQ number (>=0)
610 * failure: return < 0
612 int acpi_register_gsi(struct device *dev, u32 gsi, int triggering, int polarity)
614 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
617 if (has_8259 && gsi < 16)
618 return isa_irq_to_vector(gsi);
620 return iosapic_register_intr(gsi,
622 ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
625 ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
628 EXPORT_SYMBOL_GPL(acpi_register_gsi);
630 void acpi_unregister_gsi(u32 gsi)
632 if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
635 if (has_8259 && gsi < 16)
638 iosapic_unregister_intr(gsi);
640 EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
642 static int __init acpi_parse_fadt(struct acpi_table_header *table)
644 struct acpi_table_header *fadt_header;
645 struct acpi_table_fadt *fadt;
650 fadt_header = (struct acpi_table_header *)table;
651 if (fadt_header->revision != 3)
652 return -ENODEV; /* Only deal with ACPI 2.0 FADT */
654 fadt = (struct acpi_table_fadt *)fadt_header;
656 acpi_register_gsi(NULL, fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE,
661 int __init early_acpi_boot_init(void)
666 * do a partial walk of MADT to determine how many CPUs
667 * we have including offline CPUs
669 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
670 printk(KERN_ERR PREFIX "Can't find MADT\n");
674 ret = acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC,
675 acpi_parse_lsapic, NR_CPUS);
677 printk(KERN_ERR PREFIX
678 "Error parsing MADT - no LAPIC entries\n");
681 if (available_cpus == 0) {
682 printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
683 printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
684 smp_boot_data.cpu_phys_id[available_cpus] =
685 hard_smp_processor_id();
686 available_cpus = 1; /* We've got at least one of these, no? */
688 smp_boot_data.cpu_count = available_cpus;
690 /* Make boot-up look pretty */
691 printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
697 int __init acpi_boot_init(void)
703 * Parse the Multiple APIC Description Table (MADT), if exists.
704 * Note that this table provides platform SMP configuration
705 * information -- the successor to MPS tables.
708 if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
709 printk(KERN_ERR PREFIX "Can't find MADT\n");
715 if (acpi_table_parse_madt
716 (ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
717 printk(KERN_ERR PREFIX
718 "Error parsing LAPIC address override entry\n");
720 if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
722 printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
726 if (acpi_table_parse_madt
727 (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
728 if (!ia64_platform_is("sn2"))
729 printk(KERN_ERR PREFIX
730 "Error parsing MADT - no IOSAPIC entries\n");
733 /* System-Level Interrupt Routing */
735 if (acpi_table_parse_madt
736 (ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
737 ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
738 printk(KERN_ERR PREFIX
739 "Error parsing platform interrupt source entry\n");
741 if (acpi_table_parse_madt
742 (ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
743 printk(KERN_ERR PREFIX
744 "Error parsing interrupt source overrides entry\n");
746 if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
747 printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
751 * FADT says whether a legacy keyboard controller is present.
752 * The FADT also contains an SCI_INT line, by which the system
753 * gets interrupts such as power and sleep buttons. If it's not
754 * on a Legacy interrupt, it needs to be setup.
756 if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
757 printk(KERN_ERR PREFIX "Can't find FADT\n");
759 #ifdef CONFIG_ACPI_NUMA
761 if (srat_num_cpus == 0) {
763 for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
764 if (smp_boot_data.cpu_phys_id[cpu] !=
765 hard_smp_processor_id())
766 node_cpuid[i++].phys_id =
767 smp_boot_data.cpu_phys_id[cpu];
770 build_cpu_to_node_map();
775 int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
779 if (has_8259 && gsi < 16)
780 *irq = isa_irq_to_vector(gsi);
782 tmp = gsi_to_irq(gsi);
790 int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi)
799 * ACPI based hotplug CPU support
801 #ifdef CONFIG_ACPI_HOTPLUG_CPU
802 static int acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
804 #ifdef CONFIG_ACPI_NUMA
806 * We don't have cpu-only-node hotadd. But if the system equips
807 * SRAT table, pxm is already found and node is ready.
808 * So, just pxm_to_nid(pxm) is OK.
809 * This code here is for the system which doesn't have full SRAT
810 * table for possible cpus.
812 node_cpuid[cpu].phys_id = physid;
813 node_cpuid[cpu].nid = acpi_get_node(handle);
818 int additional_cpus __initdata = -1;
820 static __init int setup_additional_cpus(char *s)
823 additional_cpus = simple_strtol(s, NULL, 0);
828 early_param("additional_cpus", setup_additional_cpus);
831 * cpu_possible_mask should be static, it cannot change as CPUs
832 * are onlined, or offlined. The reason is per-cpu data-structures
833 * are allocated by some modules at init time, and dont expect to
834 * do this dynamically on cpu arrival/departure.
835 * cpu_present_mask on the other hand can change dynamically.
836 * In case when cpu_hotplug is not compiled, then we resort to current
837 * behaviour, which is cpu_possible == cpu_present.
840 * Three ways to find out the number of additional hotplug CPUs:
841 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
842 * - The user can overwrite it with additional_cpus=NUM
843 * - Otherwise don't reserve additional CPUs.
845 __init void prefill_possible_map(void)
848 int possible, disabled_cpus;
850 disabled_cpus = total_cpus - available_cpus;
852 if (additional_cpus == -1) {
853 if (disabled_cpus > 0)
854 additional_cpus = disabled_cpus;
859 possible = available_cpus + additional_cpus;
861 if (possible > nr_cpu_ids)
862 possible = nr_cpu_ids;
864 printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
865 possible, max((possible - available_cpus), 0));
867 for (i = 0; i < possible; i++)
868 set_cpu_possible(i, true);
871 static int _acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
876 cpumask_complement(&tmp_map, cpu_present_mask);
877 cpu = cpumask_first(&tmp_map);
878 if (cpu >= nr_cpu_ids)
881 acpi_map_cpu2node(handle, cpu, physid);
883 set_cpu_present(cpu, true);
884 ia64_cpu_to_sapicid[cpu] = physid;
886 acpi_processor_set_pdc(handle);
892 /* wrapper to silence section mismatch warning */
893 int __ref acpi_map_lsapic(acpi_handle handle, int physid, int *pcpu)
895 return _acpi_map_lsapic(handle, physid, pcpu);
897 EXPORT_SYMBOL(acpi_map_lsapic);
899 int acpi_unmap_lsapic(int cpu)
901 ia64_cpu_to_sapicid[cpu] = -1;
902 set_cpu_present(cpu, false);
904 #ifdef CONFIG_ACPI_NUMA
905 /* NUMA specific cleanup's */
911 EXPORT_SYMBOL(acpi_unmap_lsapic);
912 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
914 #ifdef CONFIG_ACPI_NUMA
915 static acpi_status acpi_map_iosapic(acpi_handle handle, u32 depth,
916 void *context, void **ret)
918 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
919 union acpi_object *obj;
920 struct acpi_madt_io_sapic *iosapic;
921 unsigned int gsi_base;
924 /* Only care about objects w/ a method that returns the MADT */
925 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
928 if (!buffer.length || !buffer.pointer)
931 obj = buffer.pointer;
932 if (obj->type != ACPI_TYPE_BUFFER ||
933 obj->buffer.length < sizeof(*iosapic)) {
934 kfree(buffer.pointer);
938 iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
940 if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
941 kfree(buffer.pointer);
945 gsi_base = iosapic->global_irq_base;
947 kfree(buffer.pointer);
949 /* OK, it's an IOSAPIC MADT entry; associate it with a node */
950 node = acpi_get_node(handle);
951 if (node == NUMA_NO_NODE || !node_online(node) ||
952 cpumask_empty(cpumask_of_node(node)))
955 /* We know a gsi to node mapping! */
956 map_iosapic_to_node(gsi_base, node);
961 acpi_map_iosapics (void)
963 acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
967 fs_initcall(acpi_map_iosapics);
968 #endif /* CONFIG_ACPI_NUMA */
970 int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
974 if ((err = iosapic_init(phys_addr, gsi_base)))
977 #ifdef CONFIG_ACPI_NUMA
978 acpi_map_iosapic(handle, 0, NULL, NULL);
979 #endif /* CONFIG_ACPI_NUMA */
984 EXPORT_SYMBOL(acpi_register_ioapic);
986 int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
988 return iosapic_remove(gsi_base);
991 EXPORT_SYMBOL(acpi_unregister_ioapic);
994 * acpi_suspend_lowlevel() - save kernel state and suspend.
996 * TBD when when IA64 starts to support suspend...
998 int acpi_suspend_lowlevel(void) { return 0; }