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/config.h>
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/kernel.h>
39 #include <linux/sched.h>
40 #include <linux/smp.h>
41 #include <linux/string.h>
42 #include <linux/types.h>
43 #include <linux/irq.h>
44 #include <linux/acpi.h>
45 #include <linux/efi.h>
46 #include <linux/mmzone.h>
47 #include <linux/nodemask.h>
49 #include <asm/iosapic.h>
50 #include <asm/machvec.h>
52 #include <asm/system.h>
55 #include <asm/cyclone.h>
57 #define BAD_MADT_ENTRY(entry, end) ( \
58 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
59 ((acpi_table_entry_header *)entry)->length != sizeof(*entry))
61 #define PREFIX "ACPI: "
63 void (*pm_idle
) (void);
64 EXPORT_SYMBOL(pm_idle
);
65 void (*pm_power_off
) (void);
66 EXPORT_SYMBOL(pm_power_off
);
68 unsigned char acpi_kbd_controller_present
= 1;
69 unsigned char acpi_legacy_devices
;
71 unsigned int acpi_cpei_override
;
72 unsigned int acpi_cpei_phys_cpuid
;
74 #define MAX_SAPICS 256
75 u16 ia64_acpiid_to_sapicid
[MAX_SAPICS
] = {[0 ... MAX_SAPICS
- 1] = -1 };
77 EXPORT_SYMBOL(ia64_acpiid_to_sapicid
);
79 const char *acpi_get_sysname(void)
81 #ifdef CONFIG_IA64_GENERIC
82 unsigned long rsdp_phys
;
83 struct acpi20_table_rsdp
*rsdp
;
84 struct acpi_table_xsdt
*xsdt
;
85 struct acpi_table_header
*hdr
;
87 rsdp_phys
= acpi_find_rsdp();
90 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
94 rsdp
= (struct acpi20_table_rsdp
*)__va(rsdp_phys
);
95 if (strncmp(rsdp
->signature
, RSDP_SIG
, sizeof(RSDP_SIG
) - 1)) {
97 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
101 xsdt
= (struct acpi_table_xsdt
*)__va(rsdp
->xsdt_address
);
103 if (strncmp(hdr
->signature
, XSDT_SIG
, sizeof(XSDT_SIG
) - 1)) {
105 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
109 if (!strcmp(hdr
->oem_id
, "HP")) {
111 } else if (!strcmp(hdr
->oem_id
, "SGI")) {
117 # if defined (CONFIG_IA64_HP_SIM)
119 # elif defined (CONFIG_IA64_HP_ZX1)
121 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
122 return "hpzx1_swiotlb";
123 # elif defined (CONFIG_IA64_SGI_SN2)
125 # elif defined (CONFIG_IA64_DIG)
128 # error Unknown platform. Fix acpi.c.
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 *__acpi_map_table(unsigned long phys_addr
, unsigned long size
)
163 return __va(phys_addr
);
166 /* --------------------------------------------------------------------------
167 Boot-time Table Parsing
168 -------------------------------------------------------------------------- */
170 static int total_cpus __initdata
;
171 static int available_cpus __initdata
;
172 struct acpi_table_madt
*acpi_madt __initdata
;
176 acpi_parse_lapic_addr_ovr(acpi_table_entry_header
* header
,
177 const unsigned long end
)
179 struct acpi_table_lapic_addr_ovr
*lapic
;
181 lapic
= (struct acpi_table_lapic_addr_ovr
*)header
;
183 if (BAD_MADT_ENTRY(lapic
, end
))
186 if (lapic
->address
) {
187 iounmap(ipi_base_addr
);
188 ipi_base_addr
= ioremap(lapic
->address
, 0);
194 acpi_parse_lsapic(acpi_table_entry_header
* header
, const unsigned long end
)
196 struct acpi_table_lsapic
*lsapic
;
198 lsapic
= (struct acpi_table_lsapic
*)header
;
200 if (BAD_MADT_ENTRY(lsapic
, end
))
203 if (lsapic
->flags
.enabled
) {
205 smp_boot_data
.cpu_phys_id
[available_cpus
] =
206 (lsapic
->id
<< 8) | lsapic
->eid
;
208 ia64_acpiid_to_sapicid
[lsapic
->acpi_id
] =
209 (lsapic
->id
<< 8) | lsapic
->eid
;
218 acpi_parse_lapic_nmi(acpi_table_entry_header
* header
, const unsigned long end
)
220 struct acpi_table_lapic_nmi
*lacpi_nmi
;
222 lacpi_nmi
= (struct acpi_table_lapic_nmi
*)header
;
224 if (BAD_MADT_ENTRY(lacpi_nmi
, end
))
227 /* TBD: Support lapic_nmi entries */
232 acpi_parse_iosapic(acpi_table_entry_header
* header
, const unsigned long end
)
234 struct acpi_table_iosapic
*iosapic
;
236 iosapic
= (struct acpi_table_iosapic
*)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(acpi_table_entry_header
* header
,
248 const unsigned long end
)
250 struct acpi_table_plat_int_src
*plintsrc
;
253 plintsrc
= (struct acpi_table_plat_int_src
*)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
->iosapic_vector
,
267 (plintsrc
->flags
.polarity
==
268 1) ? IOSAPIC_POL_HIGH
:
270 (plintsrc
->flags
.trigger
==
274 platform_intr_list
[plintsrc
->type
] = vector
;
275 if (acpi_madt_rev
> 1) {
276 acpi_cpei_override
= plintsrc
->plint_flags
.cpei_override_flag
;
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(acpi_table_entry_header
* header
,
332 const unsigned long end
)
334 struct acpi_table_int_src_ovr
*p
;
336 p
= (struct acpi_table_int_src_ovr
*)header
;
338 if (BAD_MADT_ENTRY(p
, end
))
341 iosapic_override_isa_irq(p
->bus_irq
, p
->global_irq
,
342 (p
->flags
.polarity
==
343 1) ? IOSAPIC_POL_HIGH
: IOSAPIC_POL_LOW
,
345 1) ? IOSAPIC_EDGE
: IOSAPIC_LEVEL
);
350 acpi_parse_nmi_src(acpi_table_entry_header
* header
, const unsigned long end
)
352 struct acpi_table_nmi_src
*nmi_src
;
354 nmi_src
= (struct acpi_table_nmi_src
*)header
;
356 if (BAD_MADT_ENTRY(nmi_src
, end
))
359 /* TBD: Support nimsrc entries */
363 static void __init
acpi_madt_oem_check(char *oem_id
, char *oem_table_id
)
365 if (!strncmp(oem_id
, "IBM", 3) && (!strncmp(oem_table_id
, "SERMOW", 6))) {
368 * Unfortunately ITC_DRIFT is not yet part of the
369 * official SAL spec, so the ITC_DRIFT bit is not
370 * set by the BIOS on this hardware.
372 sal_platform_features
|= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT
;
378 static int __init
acpi_parse_madt(unsigned long phys_addr
, unsigned long size
)
380 if (!phys_addr
|| !size
)
383 acpi_madt
= (struct acpi_table_madt
*)__va(phys_addr
);
385 acpi_madt_rev
= acpi_madt
->header
.revision
;
387 /* remember the value for reference after free_initmem() */
388 #ifdef CONFIG_ITANIUM
389 has_8259
= 1; /* Firmware on old Itanium systems is broken */
391 has_8259
= acpi_madt
->flags
.pcat_compat
;
393 iosapic_system_init(has_8259
);
395 /* Get base address of IPI Message Block */
397 if (acpi_madt
->lapic_address
)
398 ipi_base_addr
= ioremap(acpi_madt
->lapic_address
, 0);
400 printk(KERN_INFO PREFIX
"Local APIC address %p\n", ipi_base_addr
);
402 acpi_madt_oem_check(acpi_madt
->header
.oem_id
,
403 acpi_madt
->header
.oem_table_id
);
408 #ifdef CONFIG_ACPI_NUMA
412 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
414 static int __initdata srat_num_cpus
; /* number of cpus */
415 static u32 __devinitdata pxm_flag
[PXM_FLAG_LEN
];
416 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
417 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
418 static struct acpi_table_slit __initdata
*slit_table
;
420 static int get_processor_proximity_domain(struct acpi_table_processor_affinity
*pa
)
424 pxm
= pa
->proximity_domain
;
425 if (ia64_platform_is("sn2"))
426 pxm
+= pa
->reserved
[0] << 8;
430 static int get_memory_proximity_domain(struct acpi_table_memory_affinity
*ma
)
434 pxm
= ma
->proximity_domain
;
435 if (ia64_platform_is("sn2"))
436 pxm
+= ma
->reserved1
[0] << 8;
441 * ACPI 2.0 SLIT (System Locality Information Table)
442 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
444 void __init
acpi_numa_slit_init(struct acpi_table_slit
*slit
)
448 len
= sizeof(struct acpi_table_header
) + 8
449 + slit
->localities
* slit
->localities
;
450 if (slit
->header
.length
!= len
) {
452 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
453 len
, slit
->header
.length
);
454 memset(numa_slit
, 10, sizeof(numa_slit
));
461 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity
*pa
)
465 if (!pa
->flags
.enabled
)
468 pxm
= get_processor_proximity_domain(pa
);
470 /* record this node in proximity bitmap */
473 node_cpuid
[srat_num_cpus
].phys_id
=
474 (pa
->apic_id
<< 8) | (pa
->lsapic_eid
);
475 /* nid should be overridden as logical node id later */
476 node_cpuid
[srat_num_cpus
].nid
= pxm
;
481 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity
*ma
)
483 unsigned long paddr
, size
;
485 struct node_memblk_s
*p
, *q
, *pend
;
487 pxm
= get_memory_proximity_domain(ma
);
489 /* fill node memory chunk structure */
490 paddr
= ma
->base_addr_hi
;
491 paddr
= (paddr
<< 32) | ma
->base_addr_lo
;
492 size
= ma
->length_hi
;
493 size
= (size
<< 32) | ma
->length_lo
;
495 /* Ignore disabled entries */
496 if (!ma
->flags
.enabled
)
499 /* record this node in proximity bitmap */
502 /* Insertion sort based on base address */
503 pend
= &node_memblk
[num_node_memblks
];
504 for (p
= &node_memblk
[0]; p
< pend
; p
++) {
505 if (paddr
< p
->start_paddr
)
509 for (q
= pend
- 1; q
>= p
; q
--)
512 p
->start_paddr
= paddr
;
518 void __init
acpi_numa_arch_fixup(void)
520 int i
, j
, node_from
, node_to
;
522 /* If there's no SRAT, fix the phys_id and mark node 0 online */
523 if (srat_num_cpus
== 0) {
525 node_cpuid
[0].phys_id
= hard_smp_processor_id();
530 * MCD - This can probably be dropped now. No need for pxm ID to node ID
531 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
533 nodes_clear(node_online_map
);
534 for (i
= 0; i
< MAX_PXM_DOMAINS
; i
++) {
535 if (pxm_bit_test(i
)) {
536 int nid
= acpi_map_pxm_to_node(i
);
537 node_set_online(nid
);
541 /* set logical node id in memory chunk structure */
542 for (i
= 0; i
< num_node_memblks
; i
++)
543 node_memblk
[i
].nid
= pxm_to_node(node_memblk
[i
].nid
);
545 /* assign memory bank numbers for each chunk on each node */
546 for_each_online_node(i
) {
550 for (j
= 0; j
< num_node_memblks
; j
++)
551 if (node_memblk
[j
].nid
== i
)
552 node_memblk
[j
].bank
= bank
++;
555 /* set logical node id in cpu structure */
556 for (i
= 0; i
< srat_num_cpus
; i
++)
557 node_cpuid
[i
].nid
= pxm_to_node(node_cpuid
[i
].nid
);
559 printk(KERN_INFO
"Number of logical nodes in system = %d\n",
561 printk(KERN_INFO
"Number of memory chunks in system = %d\n",
566 memset(numa_slit
, -1, sizeof(numa_slit
));
567 for (i
= 0; i
< slit_table
->localities
; i
++) {
568 if (!pxm_bit_test(i
))
570 node_from
= pxm_to_node(i
);
571 for (j
= 0; j
< slit_table
->localities
; j
++) {
572 if (!pxm_bit_test(j
))
574 node_to
= pxm_to_node(j
);
575 node_distance(node_from
, node_to
) =
576 slit_table
->entry
[i
* slit_table
->localities
+ j
];
581 printk("ACPI 2.0 SLIT locality table:\n");
582 for_each_online_node(i
) {
583 for_each_online_node(j
)
584 printk("%03d ", node_distance(i
, j
));
589 #endif /* CONFIG_ACPI_NUMA */
592 * success: return IRQ number (>=0)
593 * failure: return < 0
595 int acpi_register_gsi(u32 gsi
, int triggering
, int polarity
)
597 if (has_8259
&& gsi
< 16)
598 return isa_irq_to_vector(gsi
);
600 return iosapic_register_intr(gsi
,
602 ACPI_ACTIVE_HIGH
) ? IOSAPIC_POL_HIGH
:
605 ACPI_EDGE_SENSITIVE
) ? IOSAPIC_EDGE
:
609 EXPORT_SYMBOL(acpi_register_gsi
);
611 void acpi_unregister_gsi(u32 gsi
)
613 iosapic_unregister_intr(gsi
);
616 EXPORT_SYMBOL(acpi_unregister_gsi
);
618 static int __init
acpi_parse_fadt(unsigned long phys_addr
, unsigned long size
)
620 struct acpi_table_header
*fadt_header
;
621 struct fadt_descriptor
*fadt
;
623 if (!phys_addr
|| !size
)
626 fadt_header
= (struct acpi_table_header
*)__va(phys_addr
);
627 if (fadt_header
->revision
!= 3)
628 return -ENODEV
; /* Only deal with ACPI 2.0 FADT */
630 fadt
= (struct fadt_descriptor
*)fadt_header
;
632 if (!(fadt
->iapc_boot_arch
& BAF_8042_KEYBOARD_CONTROLLER
))
633 acpi_kbd_controller_present
= 0;
635 if (fadt
->iapc_boot_arch
& BAF_LEGACY_DEVICES
)
636 acpi_legacy_devices
= 1;
638 acpi_register_gsi(fadt
->sci_int
, ACPI_LEVEL_SENSITIVE
, ACPI_ACTIVE_LOW
);
642 unsigned long __init
acpi_find_rsdp(void)
644 unsigned long rsdp_phys
= 0;
646 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
647 rsdp_phys
= efi
.acpi20
;
648 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
649 printk(KERN_WARNING PREFIX
650 "v1.0/r0.71 tables no longer supported\n");
654 int __init
acpi_boot_init(void)
660 * Parse the Multiple APIC Description Table (MADT), if exists.
661 * Note that this table provides platform SMP configuration
662 * information -- the successor to MPS tables.
665 if (acpi_table_parse(ACPI_APIC
, acpi_parse_madt
) < 1) {
666 printk(KERN_ERR PREFIX
"Can't find MADT\n");
672 if (acpi_table_parse_madt
673 (ACPI_MADT_LAPIC_ADDR_OVR
, acpi_parse_lapic_addr_ovr
, 0) < 0)
674 printk(KERN_ERR PREFIX
675 "Error parsing LAPIC address override entry\n");
677 if (acpi_table_parse_madt(ACPI_MADT_LSAPIC
, acpi_parse_lsapic
, NR_CPUS
)
679 printk(KERN_ERR PREFIX
680 "Error parsing MADT - no LAPIC entries\n");
682 if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI
, acpi_parse_lapic_nmi
, 0)
684 printk(KERN_ERR PREFIX
"Error parsing LAPIC NMI entry\n");
688 if (acpi_table_parse_madt
689 (ACPI_MADT_IOSAPIC
, acpi_parse_iosapic
, NR_IOSAPICS
) < 1)
690 printk(KERN_ERR PREFIX
691 "Error parsing MADT - no IOSAPIC entries\n");
693 /* System-Level Interrupt Routing */
695 if (acpi_table_parse_madt
696 (ACPI_MADT_PLAT_INT_SRC
, acpi_parse_plat_int_src
,
697 ACPI_MAX_PLATFORM_INTERRUPTS
) < 0)
698 printk(KERN_ERR PREFIX
699 "Error parsing platform interrupt source entry\n");
701 if (acpi_table_parse_madt
702 (ACPI_MADT_INT_SRC_OVR
, acpi_parse_int_src_ovr
, 0) < 0)
703 printk(KERN_ERR PREFIX
704 "Error parsing interrupt source overrides entry\n");
706 if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC
, acpi_parse_nmi_src
, 0) < 0)
707 printk(KERN_ERR PREFIX
"Error parsing NMI SRC entry\n");
711 * FADT says whether a legacy keyboard controller is present.
712 * The FADT also contains an SCI_INT line, by which the system
713 * gets interrupts such as power and sleep buttons. If it's not
714 * on a Legacy interrupt, it needs to be setup.
716 if (acpi_table_parse(ACPI_FADT
, acpi_parse_fadt
) < 1)
717 printk(KERN_ERR PREFIX
"Can't find FADT\n");
720 if (available_cpus
== 0) {
721 printk(KERN_INFO
"ACPI: Found 0 CPUS; assuming 1\n");
722 printk(KERN_INFO
"CPU 0 (0x%04x)", hard_smp_processor_id());
723 smp_boot_data
.cpu_phys_id
[available_cpus
] =
724 hard_smp_processor_id();
725 available_cpus
= 1; /* We've got at least one of these, no? */
727 smp_boot_data
.cpu_count
= available_cpus
;
730 # ifdef CONFIG_ACPI_NUMA
731 if (srat_num_cpus
== 0) {
733 for (cpu
= 0; cpu
< smp_boot_data
.cpu_count
; cpu
++)
734 if (smp_boot_data
.cpu_phys_id
[cpu
] !=
735 hard_smp_processor_id())
736 node_cpuid
[i
++].phys_id
=
737 smp_boot_data
.cpu_phys_id
[cpu
];
741 #ifdef CONFIG_ACPI_NUMA
742 build_cpu_to_node_map();
744 /* Make boot-up look pretty */
745 printk(KERN_INFO
"%d CPUs available, %d CPUs total\n", available_cpus
,
750 int acpi_gsi_to_irq(u32 gsi
, unsigned int *irq
)
754 if (has_8259
&& gsi
< 16)
755 *irq
= isa_irq_to_vector(gsi
);
757 vector
= gsi_to_vector(gsi
);
767 * ACPI based hotplug CPU support
769 #ifdef CONFIG_ACPI_HOTPLUG_CPU
771 int acpi_map_cpu2node(acpi_handle handle
, int cpu
, long physid
)
773 #ifdef CONFIG_ACPI_NUMA
776 pxm_id
= acpi_get_pxm(handle
);
779 * Assuming that the container driver would have set the proximity
780 * domain and would have initialized pxm_to_node(pxm_id) && pxm_flag
782 node_cpuid
[cpu
].nid
= (pxm_id
< 0) ? 0 : pxm_to_node(pxm_id
);
784 node_cpuid
[cpu
].phys_id
= physid
;
789 int additional_cpus __initdata
= -1;
791 static __init
int setup_additional_cpus(char *s
)
794 additional_cpus
= simple_strtol(s
, NULL
, 0);
799 early_param("additional_cpus", setup_additional_cpus
);
802 * cpu_possible_map should be static, it cannot change as cpu's
803 * are onlined, or offlined. The reason is per-cpu data-structures
804 * are allocated by some modules at init time, and dont expect to
805 * do this dynamically on cpu arrival/departure.
806 * cpu_present_map on the other hand can change dynamically.
807 * In case when cpu_hotplug is not compiled, then we resort to current
808 * behaviour, which is cpu_possible == cpu_present.
811 * Three ways to find out the number of additional hotplug CPUs:
812 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
813 * - The user can overwrite it with additional_cpus=NUM
814 * - Otherwise don't reserve additional CPUs.
816 __init
void prefill_possible_map(void)
819 int possible
, disabled_cpus
;
821 disabled_cpus
= total_cpus
- available_cpus
;
823 if (additional_cpus
== -1) {
824 if (disabled_cpus
> 0)
825 additional_cpus
= disabled_cpus
;
830 possible
= available_cpus
+ additional_cpus
;
832 if (possible
> NR_CPUS
)
835 printk(KERN_INFO
"SMP: Allowing %d CPUs, %d hotplug CPUs\n",
836 possible
, max((possible
- available_cpus
), 0));
838 for (i
= 0; i
< possible
; i
++)
839 cpu_set(i
, cpu_possible_map
);
842 int acpi_map_lsapic(acpi_handle handle
, int *pcpu
)
844 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
845 union acpi_object
*obj
;
846 struct acpi_table_lsapic
*lsapic
;
851 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
854 if (!buffer
.length
|| !buffer
.pointer
)
857 obj
= buffer
.pointer
;
858 if (obj
->type
!= ACPI_TYPE_BUFFER
||
859 obj
->buffer
.length
< sizeof(*lsapic
)) {
860 acpi_os_free(buffer
.pointer
);
864 lsapic
= (struct acpi_table_lsapic
*)obj
->buffer
.pointer
;
866 if ((lsapic
->header
.type
!= ACPI_MADT_LSAPIC
) ||
867 (!lsapic
->flags
.enabled
)) {
868 acpi_os_free(buffer
.pointer
);
872 physid
= ((lsapic
->id
<< 8) | (lsapic
->eid
));
874 acpi_os_free(buffer
.pointer
);
875 buffer
.length
= ACPI_ALLOCATE_BUFFER
;
876 buffer
.pointer
= NULL
;
878 cpus_complement(tmp_map
, cpu_present_map
);
879 cpu
= first_cpu(tmp_map
);
883 acpi_map_cpu2node(handle
, cpu
, physid
);
885 cpu_set(cpu
, cpu_present_map
);
886 ia64_cpu_to_sapicid
[cpu
] = physid
;
887 ia64_acpiid_to_sapicid
[lsapic
->acpi_id
] = ia64_cpu_to_sapicid
[cpu
];
893 EXPORT_SYMBOL(acpi_map_lsapic
);
895 int acpi_unmap_lsapic(int cpu
)
899 for (i
= 0; i
< MAX_SAPICS
; i
++) {
900 if (ia64_acpiid_to_sapicid
[i
] == ia64_cpu_to_sapicid
[cpu
]) {
901 ia64_acpiid_to_sapicid
[i
] = -1;
905 ia64_cpu_to_sapicid
[cpu
] = -1;
906 cpu_clear(cpu
, cpu_present_map
);
908 #ifdef CONFIG_ACPI_NUMA
909 /* NUMA specific cleanup's */
915 EXPORT_SYMBOL(acpi_unmap_lsapic
);
916 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
918 #ifdef CONFIG_ACPI_NUMA
919 static acpi_status __devinit
920 acpi_map_iosapic(acpi_handle handle
, u32 depth
, void *context
, void **ret
)
922 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
923 union acpi_object
*obj
;
924 struct acpi_table_iosapic
*iosapic
;
925 unsigned int gsi_base
;
928 /* Only care about objects w/ a method that returns the MADT */
929 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
932 if (!buffer
.length
|| !buffer
.pointer
)
935 obj
= buffer
.pointer
;
936 if (obj
->type
!= ACPI_TYPE_BUFFER
||
937 obj
->buffer
.length
< sizeof(*iosapic
)) {
938 acpi_os_free(buffer
.pointer
);
942 iosapic
= (struct acpi_table_iosapic
*)obj
->buffer
.pointer
;
944 if (iosapic
->header
.type
!= ACPI_MADT_IOSAPIC
) {
945 acpi_os_free(buffer
.pointer
);
949 gsi_base
= iosapic
->global_irq_base
;
951 acpi_os_free(buffer
.pointer
);
954 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
955 * us which node to associate this with.
957 pxm
= acpi_get_pxm(handle
);
961 node
= pxm_to_node(pxm
);
963 if (node
>= MAX_NUMNODES
|| !node_online(node
) ||
964 cpus_empty(node_to_cpumask(node
)))
967 /* We know a gsi to node mapping! */
968 map_iosapic_to_node(gsi_base
, node
);
973 acpi_map_iosapics (void)
975 acpi_get_devices(NULL
, acpi_map_iosapic
, NULL
, NULL
);
979 fs_initcall(acpi_map_iosapics
);
980 #endif /* CONFIG_ACPI_NUMA */
982 int acpi_register_ioapic(acpi_handle handle
, u64 phys_addr
, u32 gsi_base
)
986 if ((err
= iosapic_init(phys_addr
, gsi_base
)))
989 #ifdef CONFIG_ACPI_NUMA
990 acpi_map_iosapic(handle
, 0, NULL
, NULL
);
991 #endif /* CONFIG_ACPI_NUMA */
996 EXPORT_SYMBOL(acpi_register_ioapic
);
998 int acpi_unregister_ioapic(acpi_handle handle
, u32 gsi_base
)
1000 return iosapic_remove(gsi_base
);
1003 EXPORT_SYMBOL(acpi_unregister_ioapic
);
1005 #endif /* CONFIG_ACPI */