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>
48 #include <asm/iosapic.h>
49 #include <asm/machvec.h>
51 #include <asm/system.h>
54 #include <asm/cyclone.h>
56 #define BAD_MADT_ENTRY(entry, end) ( \
57 (!entry) || (unsigned long)entry + sizeof(*entry) > end || \
58 ((acpi_table_entry_header *)entry)->length < sizeof(*entry))
60 #define PREFIX "ACPI: "
62 void (*pm_idle
) (void);
63 EXPORT_SYMBOL(pm_idle
);
64 void (*pm_power_off
) (void);
65 EXPORT_SYMBOL(pm_power_off
);
67 unsigned int acpi_cpei_override
;
68 unsigned int acpi_cpei_phys_cpuid
;
70 #define MAX_SAPICS 256
71 u16 ia64_acpiid_to_sapicid
[MAX_SAPICS
] = {[0 ... MAX_SAPICS
- 1] = -1 };
73 EXPORT_SYMBOL(ia64_acpiid_to_sapicid
);
75 const char *acpi_get_sysname(void)
77 #ifdef CONFIG_IA64_GENERIC
78 unsigned long rsdp_phys
;
79 struct acpi_table_rsdp
*rsdp
;
80 struct acpi_table_xsdt
*xsdt
;
81 struct acpi_table_header
*hdr
;
83 rsdp_phys
= acpi_find_rsdp();
86 "ACPI 2.0 RSDP not found, default to \"dig\"\n");
90 rsdp
= (struct acpi_table_rsdp
*)__va(rsdp_phys
);
91 if (strncmp(rsdp
->signature
, ACPI_SIG_RSDP
, sizeof(ACPI_SIG_RSDP
) - 1)) {
93 "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
97 xsdt
= (struct acpi_table_xsdt
*)__va(rsdp
->xsdt_address
);
99 if (strncmp(hdr
->signature
, ACPI_SIG_XSDT
, sizeof(ACPI_SIG_XSDT
) - 1)) {
101 "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
105 if (!strcmp(hdr
->oem_id
, "HP")) {
107 } else if (!strcmp(hdr
->oem_id
, "SGI")) {
113 # if defined (CONFIG_IA64_HP_SIM)
115 # elif defined (CONFIG_IA64_HP_ZX1)
117 # elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
118 return "hpzx1_swiotlb";
119 # elif defined (CONFIG_IA64_SGI_SN2)
121 # elif defined (CONFIG_IA64_DIG)
124 # error Unknown platform. Fix acpi.c.
131 #define ACPI_MAX_PLATFORM_INTERRUPTS 256
133 /* Array to record platform interrupt vectors for generic interrupt routing. */
134 int platform_intr_list
[ACPI_MAX_PLATFORM_INTERRUPTS
] = {
135 [0 ... ACPI_MAX_PLATFORM_INTERRUPTS
- 1] = -1
138 enum acpi_irq_model_id acpi_irq_model
= ACPI_IRQ_MODEL_IOSAPIC
;
141 * Interrupt routing API for device drivers. Provides interrupt vector for
142 * a generic platform event. Currently only CPEI is implemented.
144 int acpi_request_vector(u32 int_type
)
148 if (int_type
< ACPI_MAX_PLATFORM_INTERRUPTS
) {
149 /* corrected platform error interrupt */
150 vector
= platform_intr_list
[int_type
];
153 "acpi_request_vector(): invalid interrupt type\n");
157 char *__acpi_map_table(unsigned long phys_addr
, unsigned long size
)
159 return __va(phys_addr
);
162 /* --------------------------------------------------------------------------
163 Boot-time Table Parsing
164 -------------------------------------------------------------------------- */
166 static int total_cpus __initdata
;
167 static int available_cpus __initdata
;
168 struct acpi_table_madt
*acpi_madt __initdata
;
172 acpi_parse_lapic_addr_ovr(acpi_table_entry_header
* header
,
173 const unsigned long end
)
175 struct acpi_table_lapic_addr_ovr
*lapic
;
177 lapic
= (struct acpi_table_lapic_addr_ovr
*)header
;
179 if (BAD_MADT_ENTRY(lapic
, end
))
182 if (lapic
->address
) {
183 iounmap(ipi_base_addr
);
184 ipi_base_addr
= ioremap(lapic
->address
, 0);
190 acpi_parse_lsapic(acpi_table_entry_header
* header
, const unsigned long end
)
192 struct acpi_table_lsapic
*lsapic
;
194 lsapic
= (struct acpi_table_lsapic
*)header
;
196 if (BAD_MADT_ENTRY(lsapic
, end
))
199 if (lsapic
->flags
.enabled
) {
201 smp_boot_data
.cpu_phys_id
[available_cpus
] =
202 (lsapic
->id
<< 8) | lsapic
->eid
;
204 ia64_acpiid_to_sapicid
[lsapic
->acpi_id
] =
205 (lsapic
->id
<< 8) | lsapic
->eid
;
214 acpi_parse_lapic_nmi(acpi_table_entry_header
* header
, const unsigned long end
)
216 struct acpi_table_lapic_nmi
*lacpi_nmi
;
218 lacpi_nmi
= (struct acpi_table_lapic_nmi
*)header
;
220 if (BAD_MADT_ENTRY(lacpi_nmi
, end
))
223 /* TBD: Support lapic_nmi entries */
228 acpi_parse_iosapic(acpi_table_entry_header
* header
, const unsigned long end
)
230 struct acpi_table_iosapic
*iosapic
;
232 iosapic
= (struct acpi_table_iosapic
*)header
;
234 if (BAD_MADT_ENTRY(iosapic
, end
))
237 return iosapic_init(iosapic
->address
, iosapic
->global_irq_base
);
240 static unsigned int __initdata acpi_madt_rev
;
243 acpi_parse_plat_int_src(acpi_table_entry_header
* header
,
244 const unsigned long end
)
246 struct acpi_table_plat_int_src
*plintsrc
;
249 plintsrc
= (struct acpi_table_plat_int_src
*)header
;
251 if (BAD_MADT_ENTRY(plintsrc
, end
))
255 * Get vector assignment for this interrupt, set attributes,
256 * and program the IOSAPIC routing table.
258 vector
= iosapic_register_platform_intr(plintsrc
->type
,
259 plintsrc
->global_irq
,
260 plintsrc
->iosapic_vector
,
263 (plintsrc
->flags
.polarity
==
264 1) ? IOSAPIC_POL_HIGH
:
266 (plintsrc
->flags
.trigger
==
270 platform_intr_list
[plintsrc
->type
] = vector
;
271 if (acpi_madt_rev
> 1) {
272 acpi_cpei_override
= plintsrc
->plint_flags
.cpei_override_flag
;
276 * Save the physical id, so we can check when its being removed
278 acpi_cpei_phys_cpuid
= ((plintsrc
->id
<< 8) | (plintsrc
->eid
)) & 0xffff;
283 #ifdef CONFIG_HOTPLUG_CPU
284 unsigned int can_cpei_retarget(void)
286 extern int cpe_vector
;
287 extern unsigned int force_cpei_retarget
;
290 * Only if CPEI is supported and the override flag
291 * is present, otherwise return that its re-targettable
292 * if we are in polling mode.
294 if (cpe_vector
> 0) {
295 if (acpi_cpei_override
|| force_cpei_retarget
)
303 unsigned int is_cpu_cpei_target(unsigned int cpu
)
305 unsigned int logical_id
;
307 logical_id
= cpu_logical_id(acpi_cpei_phys_cpuid
);
309 if (logical_id
== cpu
)
315 void set_cpei_target_cpu(unsigned int cpu
)
317 acpi_cpei_phys_cpuid
= cpu_physical_id(cpu
);
321 unsigned int get_cpei_target_cpu(void)
323 return acpi_cpei_phys_cpuid
;
327 acpi_parse_int_src_ovr(acpi_table_entry_header
* header
,
328 const unsigned long end
)
330 struct acpi_table_int_src_ovr
*p
;
332 p
= (struct acpi_table_int_src_ovr
*)header
;
334 if (BAD_MADT_ENTRY(p
, end
))
337 iosapic_override_isa_irq(p
->bus_irq
, p
->global_irq
,
338 (p
->flags
.polarity
==
339 1) ? IOSAPIC_POL_HIGH
: IOSAPIC_POL_LOW
,
341 1) ? IOSAPIC_EDGE
: IOSAPIC_LEVEL
);
346 acpi_parse_nmi_src(acpi_table_entry_header
* header
, const unsigned long end
)
348 struct acpi_table_nmi_src
*nmi_src
;
350 nmi_src
= (struct acpi_table_nmi_src
*)header
;
352 if (BAD_MADT_ENTRY(nmi_src
, end
))
355 /* TBD: Support nimsrc entries */
359 static void __init
acpi_madt_oem_check(char *oem_id
, char *oem_table_id
)
361 if (!strncmp(oem_id
, "IBM", 3) && (!strncmp(oem_table_id
, "SERMOW", 6))) {
364 * Unfortunately ITC_DRIFT is not yet part of the
365 * official SAL spec, so the ITC_DRIFT bit is not
366 * set by the BIOS on this hardware.
368 sal_platform_features
|= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT
;
374 static int __init
acpi_parse_madt(unsigned long phys_addr
, unsigned long size
)
376 if (!phys_addr
|| !size
)
379 acpi_madt
= (struct acpi_table_madt
*)__va(phys_addr
);
381 acpi_madt_rev
= acpi_madt
->header
.revision
;
383 /* remember the value for reference after free_initmem() */
384 #ifdef CONFIG_ITANIUM
385 has_8259
= 1; /* Firmware on old Itanium systems is broken */
387 has_8259
= acpi_madt
->flags
.pcat_compat
;
389 iosapic_system_init(has_8259
);
391 /* Get base address of IPI Message Block */
393 if (acpi_madt
->lapic_address
)
394 ipi_base_addr
= ioremap(acpi_madt
->lapic_address
, 0);
396 printk(KERN_INFO PREFIX
"Local APIC address %p\n", ipi_base_addr
);
398 acpi_madt_oem_check(acpi_madt
->header
.oem_id
,
399 acpi_madt
->header
.oem_table_id
);
404 #ifdef CONFIG_ACPI_NUMA
408 #define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
410 static int __initdata srat_num_cpus
; /* number of cpus */
411 static u32 __devinitdata pxm_flag
[PXM_FLAG_LEN
];
412 #define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
413 #define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
414 static struct acpi_table_slit __initdata
*slit_table
;
416 static int get_processor_proximity_domain(struct acpi_table_processor_affinity
*pa
)
420 pxm
= pa
->proximity_domain
;
421 if (ia64_platform_is("sn2"))
422 pxm
+= pa
->reserved
[0] << 8;
426 static int get_memory_proximity_domain(struct acpi_table_memory_affinity
*ma
)
430 pxm
= ma
->proximity_domain
;
431 if (ia64_platform_is("sn2"))
432 pxm
+= ma
->reserved1
[0] << 8;
437 * ACPI 2.0 SLIT (System Locality Information Table)
438 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
440 void __init
acpi_numa_slit_init(struct acpi_table_slit
*slit
)
444 len
= sizeof(struct acpi_table_header
) + 8
445 + slit
->localities
* slit
->localities
;
446 if (slit
->header
.length
!= len
) {
448 "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
449 len
, slit
->header
.length
);
450 memset(numa_slit
, 10, sizeof(numa_slit
));
457 acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity
*pa
)
461 if (!pa
->flags
.enabled
)
464 pxm
= get_processor_proximity_domain(pa
);
466 /* record this node in proximity bitmap */
469 node_cpuid
[srat_num_cpus
].phys_id
=
470 (pa
->apic_id
<< 8) | (pa
->lsapic_eid
);
471 /* nid should be overridden as logical node id later */
472 node_cpuid
[srat_num_cpus
].nid
= pxm
;
477 acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity
*ma
)
479 unsigned long paddr
, size
;
481 struct node_memblk_s
*p
, *q
, *pend
;
483 pxm
= get_memory_proximity_domain(ma
);
485 /* fill node memory chunk structure */
486 paddr
= ma
->base_addr_hi
;
487 paddr
= (paddr
<< 32) | ma
->base_addr_lo
;
488 size
= ma
->length_hi
;
489 size
= (size
<< 32) | ma
->length_lo
;
491 /* Ignore disabled entries */
492 if (!ma
->flags
.enabled
)
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
;
514 void __init
acpi_numa_arch_fixup(void)
516 int i
, j
, node_from
, node_to
;
518 /* If there's no SRAT, fix the phys_id and mark node 0 online */
519 if (srat_num_cpus
== 0) {
521 node_cpuid
[0].phys_id
= hard_smp_processor_id();
526 * MCD - This can probably be dropped now. No need for pxm ID to node ID
527 * mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
529 nodes_clear(node_online_map
);
530 for (i
= 0; i
< MAX_PXM_DOMAINS
; i
++) {
531 if (pxm_bit_test(i
)) {
532 int nid
= acpi_map_pxm_to_node(i
);
533 node_set_online(nid
);
537 /* set logical node id in memory chunk structure */
538 for (i
= 0; i
< num_node_memblks
; i
++)
539 node_memblk
[i
].nid
= pxm_to_node(node_memblk
[i
].nid
);
541 /* assign memory bank numbers for each chunk on each node */
542 for_each_online_node(i
) {
546 for (j
= 0; j
< num_node_memblks
; j
++)
547 if (node_memblk
[j
].nid
== i
)
548 node_memblk
[j
].bank
= bank
++;
551 /* set logical node id in cpu structure */
552 for (i
= 0; i
< srat_num_cpus
; i
++)
553 node_cpuid
[i
].nid
= pxm_to_node(node_cpuid
[i
].nid
);
555 printk(KERN_INFO
"Number of logical nodes in system = %d\n",
557 printk(KERN_INFO
"Number of memory chunks in system = %d\n",
562 memset(numa_slit
, -1, sizeof(numa_slit
));
563 for (i
= 0; i
< slit_table
->localities
; i
++) {
564 if (!pxm_bit_test(i
))
566 node_from
= pxm_to_node(i
);
567 for (j
= 0; j
< slit_table
->localities
; j
++) {
568 if (!pxm_bit_test(j
))
570 node_to
= pxm_to_node(j
);
571 node_distance(node_from
, node_to
) =
572 slit_table
->entry
[i
* slit_table
->localities
+ j
];
577 printk("ACPI 2.0 SLIT locality table:\n");
578 for_each_online_node(i
) {
579 for_each_online_node(j
)
580 printk("%03d ", node_distance(i
, j
));
585 #endif /* CONFIG_ACPI_NUMA */
588 * success: return IRQ number (>=0)
589 * failure: return < 0
591 int acpi_register_gsi(u32 gsi
, int triggering
, int polarity
)
593 if (acpi_irq_model
== ACPI_IRQ_MODEL_PLATFORM
)
596 if (has_8259
&& gsi
< 16)
597 return isa_irq_to_vector(gsi
);
599 return iosapic_register_intr(gsi
,
601 ACPI_ACTIVE_HIGH
) ? IOSAPIC_POL_HIGH
:
604 ACPI_EDGE_SENSITIVE
) ? IOSAPIC_EDGE
:
608 EXPORT_SYMBOL(acpi_register_gsi
);
610 void acpi_unregister_gsi(u32 gsi
)
612 iosapic_unregister_intr(gsi
);
615 EXPORT_SYMBOL(acpi_unregister_gsi
);
617 static int __init
acpi_parse_fadt(unsigned long phys_addr
, unsigned long size
)
619 struct acpi_table_header
*fadt_header
;
620 struct acpi_table_fadt
*fadt
;
622 if (!phys_addr
|| !size
)
625 fadt_header
= (struct acpi_table_header
*)__va(phys_addr
);
626 if (fadt_header
->revision
!= 3)
627 return -ENODEV
; /* Only deal with ACPI 2.0 FADT */
629 fadt
= (struct acpi_table_fadt
*)fadt_header
;
631 acpi_register_gsi(fadt
->sci_interrupt
, ACPI_LEVEL_SENSITIVE
, ACPI_ACTIVE_LOW
);
635 unsigned long __init
acpi_find_rsdp(void)
637 unsigned long rsdp_phys
= 0;
639 if (efi
.acpi20
!= EFI_INVALID_TABLE_ADDR
)
640 rsdp_phys
= efi
.acpi20
;
641 else if (efi
.acpi
!= EFI_INVALID_TABLE_ADDR
)
642 printk(KERN_WARNING PREFIX
643 "v1.0/r0.71 tables no longer supported\n");
647 int __init
acpi_boot_init(void)
653 * Parse the Multiple APIC Description Table (MADT), if exists.
654 * Note that this table provides platform SMP configuration
655 * information -- the successor to MPS tables.
658 if (acpi_table_parse(ACPI_APIC
, acpi_parse_madt
) < 1) {
659 printk(KERN_ERR PREFIX
"Can't find MADT\n");
665 if (acpi_table_parse_madt
666 (ACPI_MADT_LAPIC_ADDR_OVR
, acpi_parse_lapic_addr_ovr
, 0) < 0)
667 printk(KERN_ERR PREFIX
668 "Error parsing LAPIC address override entry\n");
670 if (acpi_table_parse_madt(ACPI_MADT_LSAPIC
, acpi_parse_lsapic
, NR_CPUS
)
672 printk(KERN_ERR PREFIX
673 "Error parsing MADT - no LAPIC entries\n");
675 if (acpi_table_parse_madt(ACPI_MADT_LAPIC_NMI
, acpi_parse_lapic_nmi
, 0)
677 printk(KERN_ERR PREFIX
"Error parsing LAPIC NMI entry\n");
681 if (acpi_table_parse_madt
682 (ACPI_MADT_IOSAPIC
, acpi_parse_iosapic
, NR_IOSAPICS
) < 1)
683 printk(KERN_ERR PREFIX
684 "Error parsing MADT - no IOSAPIC entries\n");
686 /* System-Level Interrupt Routing */
688 if (acpi_table_parse_madt
689 (ACPI_MADT_PLAT_INT_SRC
, acpi_parse_plat_int_src
,
690 ACPI_MAX_PLATFORM_INTERRUPTS
) < 0)
691 printk(KERN_ERR PREFIX
692 "Error parsing platform interrupt source entry\n");
694 if (acpi_table_parse_madt
695 (ACPI_MADT_INT_SRC_OVR
, acpi_parse_int_src_ovr
, 0) < 0)
696 printk(KERN_ERR PREFIX
697 "Error parsing interrupt source overrides entry\n");
699 if (acpi_table_parse_madt(ACPI_MADT_NMI_SRC
, acpi_parse_nmi_src
, 0) < 0)
700 printk(KERN_ERR PREFIX
"Error parsing NMI SRC entry\n");
704 * FADT says whether a legacy keyboard controller is present.
705 * The FADT also contains an SCI_INT line, by which the system
706 * gets interrupts such as power and sleep buttons. If it's not
707 * on a Legacy interrupt, it needs to be setup.
709 if (acpi_table_parse(ACPI_FADT
, acpi_parse_fadt
) < 1)
710 printk(KERN_ERR PREFIX
"Can't find FADT\n");
713 if (available_cpus
== 0) {
714 printk(KERN_INFO
"ACPI: Found 0 CPUS; assuming 1\n");
715 printk(KERN_INFO
"CPU 0 (0x%04x)", hard_smp_processor_id());
716 smp_boot_data
.cpu_phys_id
[available_cpus
] =
717 hard_smp_processor_id();
718 available_cpus
= 1; /* We've got at least one of these, no? */
720 smp_boot_data
.cpu_count
= available_cpus
;
723 # ifdef CONFIG_ACPI_NUMA
724 if (srat_num_cpus
== 0) {
726 for (cpu
= 0; cpu
< smp_boot_data
.cpu_count
; cpu
++)
727 if (smp_boot_data
.cpu_phys_id
[cpu
] !=
728 hard_smp_processor_id())
729 node_cpuid
[i
++].phys_id
=
730 smp_boot_data
.cpu_phys_id
[cpu
];
734 #ifdef CONFIG_ACPI_NUMA
735 build_cpu_to_node_map();
737 /* Make boot-up look pretty */
738 printk(KERN_INFO
"%d CPUs available, %d CPUs total\n", available_cpus
,
743 int acpi_gsi_to_irq(u32 gsi
, unsigned int *irq
)
747 if (has_8259
&& gsi
< 16)
748 *irq
= isa_irq_to_vector(gsi
);
750 vector
= gsi_to_vector(gsi
);
760 * ACPI based hotplug CPU support
762 #ifdef CONFIG_ACPI_HOTPLUG_CPU
764 int acpi_map_cpu2node(acpi_handle handle
, int cpu
, long physid
)
766 #ifdef CONFIG_ACPI_NUMA
770 pxm_id
= acpi_get_pxm(handle
);
772 * We don't have cpu-only-node hotadd. But if the system equips
773 * SRAT table, pxm is already found and node is ready.
774 * So, just pxm_to_nid(pxm) is OK.
775 * This code here is for the system which doesn't have full SRAT
776 * table for possible cpus.
778 nid
= acpi_map_pxm_to_node(pxm_id
);
779 node_cpuid
[cpu
].phys_id
= physid
;
780 node_cpuid
[cpu
].nid
= nid
;
785 int additional_cpus __initdata
= -1;
787 static __init
int setup_additional_cpus(char *s
)
790 additional_cpus
= simple_strtol(s
, NULL
, 0);
795 early_param("additional_cpus", setup_additional_cpus
);
798 * cpu_possible_map should be static, it cannot change as cpu's
799 * are onlined, or offlined. The reason is per-cpu data-structures
800 * are allocated by some modules at init time, and dont expect to
801 * do this dynamically on cpu arrival/departure.
802 * cpu_present_map on the other hand can change dynamically.
803 * In case when cpu_hotplug is not compiled, then we resort to current
804 * behaviour, which is cpu_possible == cpu_present.
807 * Three ways to find out the number of additional hotplug CPUs:
808 * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
809 * - The user can overwrite it with additional_cpus=NUM
810 * - Otherwise don't reserve additional CPUs.
812 __init
void prefill_possible_map(void)
815 int possible
, disabled_cpus
;
817 disabled_cpus
= total_cpus
- available_cpus
;
819 if (additional_cpus
== -1) {
820 if (disabled_cpus
> 0)
821 additional_cpus
= disabled_cpus
;
826 possible
= available_cpus
+ additional_cpus
;
828 if (possible
> NR_CPUS
)
831 printk(KERN_INFO
"SMP: Allowing %d CPUs, %d hotplug CPUs\n",
832 possible
, max((possible
- available_cpus
), 0));
834 for (i
= 0; i
< possible
; i
++)
835 cpu_set(i
, cpu_possible_map
);
838 int acpi_map_lsapic(acpi_handle handle
, int *pcpu
)
840 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
841 union acpi_object
*obj
;
842 struct acpi_table_lsapic
*lsapic
;
847 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_MAT", NULL
, &buffer
)))
850 if (!buffer
.length
|| !buffer
.pointer
)
853 obj
= buffer
.pointer
;
854 if (obj
->type
!= ACPI_TYPE_BUFFER
||
855 obj
->buffer
.length
< sizeof(*lsapic
)) {
856 kfree(buffer
.pointer
);
860 lsapic
= (struct acpi_table_lsapic
*)obj
->buffer
.pointer
;
862 if ((lsapic
->header
.type
!= ACPI_MADT_LSAPIC
) ||
863 (!lsapic
->flags
.enabled
)) {
864 kfree(buffer
.pointer
);
868 physid
= ((lsapic
->id
<< 8) | (lsapic
->eid
));
870 kfree(buffer
.pointer
);
871 buffer
.length
= ACPI_ALLOCATE_BUFFER
;
872 buffer
.pointer
= NULL
;
874 cpus_complement(tmp_map
, cpu_present_map
);
875 cpu
= first_cpu(tmp_map
);
879 acpi_map_cpu2node(handle
, cpu
, physid
);
881 cpu_set(cpu
, cpu_present_map
);
882 ia64_cpu_to_sapicid
[cpu
] = physid
;
883 ia64_acpiid_to_sapicid
[lsapic
->acpi_id
] = ia64_cpu_to_sapicid
[cpu
];
889 EXPORT_SYMBOL(acpi_map_lsapic
);
891 int acpi_unmap_lsapic(int cpu
)
895 for (i
= 0; i
< MAX_SAPICS
; i
++) {
896 if (ia64_acpiid_to_sapicid
[i
] == ia64_cpu_to_sapicid
[cpu
]) {
897 ia64_acpiid_to_sapicid
[i
] = -1;
901 ia64_cpu_to_sapicid
[cpu
] = -1;
902 cpu_clear(cpu
, cpu_present_map
);
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 __devinit
916 acpi_map_iosapic(acpi_handle handle
, u32 depth
, void *context
, void **ret
)
918 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
919 union acpi_object
*obj
;
920 struct acpi_table_iosapic
*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_table_iosapic
*)obj
->buffer
.pointer
;
940 if (iosapic
->header
.type
!= ACPI_MADT_IOSAPIC
) {
941 kfree(buffer
.pointer
);
945 gsi_base
= iosapic
->global_irq_base
;
947 kfree(buffer
.pointer
);
950 * OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
951 * us which node to associate this with.
953 pxm
= acpi_get_pxm(handle
);
957 node
= pxm_to_node(pxm
);
959 if (node
>= MAX_NUMNODES
|| !node_online(node
) ||
960 cpus_empty(node_to_cpumask(node
)))
963 /* We know a gsi to node mapping! */
964 map_iosapic_to_node(gsi_base
, node
);
969 acpi_map_iosapics (void)
971 acpi_get_devices(NULL
, acpi_map_iosapic
, NULL
, NULL
);
975 fs_initcall(acpi_map_iosapics
);
976 #endif /* CONFIG_ACPI_NUMA */
978 int acpi_register_ioapic(acpi_handle handle
, u64 phys_addr
, u32 gsi_base
)
982 if ((err
= iosapic_init(phys_addr
, gsi_base
)))
985 #ifdef CONFIG_ACPI_NUMA
986 acpi_map_iosapic(handle
, 0, NULL
, NULL
);
987 #endif /* CONFIG_ACPI_NUMA */
992 EXPORT_SYMBOL(acpi_register_ioapic
);
994 int acpi_unregister_ioapic(acpi_handle handle
, u32 gsi_base
)
996 return iosapic_remove(gsi_base
);
999 EXPORT_SYMBOL(acpi_unregister_ioapic
);
1001 #endif /* CONFIG_ACPI */