x86: use cpumask function for present, possible, and online cpus
[linux-3.10.git] / arch / x86 / kernel / genapic_64.c
1 /*
2  * Copyright 2004 James Cleverdon, IBM.
3  * Subject to the GNU Public License, v.2
4  *
5  * Generic APIC sub-arch probe layer.
6  *
7  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
9  * James Cleverdon.
10  */
11 #include <linux/threads.h>
12 #include <linux/cpumask.h>
13 #include <linux/string.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/ctype.h>
17 #include <linux/init.h>
18 #include <linux/hardirq.h>
19
20 #include <asm/smp.h>
21 #include <asm/ipi.h>
22 #include <asm/genapic.h>
23
24 #ifdef CONFIG_ACPI
25 #include <acpi/acpi_bus.h>
26 #endif
27
28 DEFINE_PER_CPU(int, x2apic_extra_bits);
29
30 struct genapic __read_mostly *genapic = &apic_flat;
31
32 static enum uv_system_type uv_system_type;
33
34 /*
35  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
36  */
37 void __init setup_apic_routing(void)
38 {
39         if (uv_system_type == UV_NON_UNIQUE_APIC)
40                 genapic = &apic_x2apic_uv_x;
41         else
42 #ifdef CONFIG_ACPI
43         /*
44          * Quirk: some x86_64 machines can only use physical APIC mode
45          * regardless of how many processors are present (x86_64 ES7000
46          * is an example).
47          */
48         if (acpi_gbl_FADT.header.revision > FADT2_REVISION_ID &&
49                         (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL))
50                 genapic = &apic_physflat;
51         else
52 #endif
53
54         if (num_possible_cpus() <= 8)
55                 genapic = &apic_flat;
56         else
57                 genapic = &apic_physflat;
58
59         printk(KERN_INFO "Setting APIC routing to %s\n", genapic->name);
60 }
61
62 /* Same for both flat and physical. */
63
64 void send_IPI_self(int vector)
65 {
66         __send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
67 }
68
69 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
70 {
71         if (!strcmp(oem_id, "SGI")) {
72                 if (!strcmp(oem_table_id, "UVL"))
73                         uv_system_type = UV_LEGACY_APIC;
74                 else if (!strcmp(oem_table_id, "UVX"))
75                         uv_system_type = UV_X2APIC;
76                 else if (!strcmp(oem_table_id, "UVH"))
77                         uv_system_type = UV_NON_UNIQUE_APIC;
78         }
79         return 0;
80 }
81
82 unsigned int read_apic_id(void)
83 {
84         unsigned int id;
85
86         WARN_ON(preemptible());
87         id = apic_read(APIC_ID);
88         if (uv_system_type >= UV_X2APIC)
89                 id  |= __get_cpu_var(x2apic_extra_bits);
90         return id;
91 }
92
93 enum uv_system_type get_uv_system_type(void)
94 {
95         return uv_system_type;
96 }
97
98 int is_uv_system(void)
99 {
100         return uv_system_type != UV_NONE;
101 }