c4cbd3080c1c36e0c798d10a4652427fa4e09603
[linux-2.6.git] / arch / x86 / kernel / apic / probe_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 #include <linux/dmar.h>
20
21 #include <asm/smp.h>
22 #include <asm/apic.h>
23 #include <asm/ipi.h>
24 #include <asm/setup.h>
25
26 extern struct apic apic_flat;
27 extern struct apic apic_physflat;
28 extern struct apic apic_x2xpic_uv_x;
29 extern struct apic apic_x2apic_phys;
30 extern struct apic apic_x2apic_cluster;
31
32 struct apic __read_mostly *apic = &apic_flat;
33 EXPORT_SYMBOL_GPL(apic);
34
35 static struct apic *apic_probe[] __initdata = {
36 #ifdef CONFIG_X86_UV
37         &apic_x2apic_uv_x,
38 #endif
39 #ifdef CONFIG_X86_X2APIC
40         &apic_x2apic_phys,
41         &apic_x2apic_cluster,
42 #endif
43         &apic_physflat,
44         NULL,
45 };
46
47 static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
48 {
49         return hard_smp_processor_id() >> index_msb;
50 }
51
52 /*
53  * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode.
54  */
55 void __init default_setup_apic_routing(void)
56 {
57 #ifdef CONFIG_X86_X2APIC
58         if (x2apic_mode
59 #ifdef CONFIG_X86_UV
60                        && apic != &apic_x2apic_uv_x
61 #endif
62                        ) {
63                 if (x2apic_phys)
64                         apic = &apic_x2apic_phys;
65                 else
66                         apic = &apic_x2apic_cluster;
67         }
68 #endif
69
70         if (apic == &apic_flat) {
71                 switch (boot_cpu_data.x86_vendor) {
72                 case X86_VENDOR_INTEL:
73                         if (num_processors > 8)
74                                 apic = &apic_physflat;
75                         break;
76                 case X86_VENDOR_AMD:
77                         if (max_physical_apicid >= 8)
78                                 apic = &apic_physflat;
79                 }
80         }
81
82         printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
83
84         if (is_vsmp_box()) {
85                 /* need to update phys_pkg_id */
86                 apic->phys_pkg_id = apicid_phys_pkg_id;
87         }
88
89         /*
90          * Now that apic routing model is selected, configure the
91          * fault handling for intr remapping.
92          */
93         if (intr_remapping_enabled)
94                 enable_drhd_fault_handling();
95 }
96
97 /* Same for both flat and physical. */
98
99 void apic_send_IPI_self(int vector)
100 {
101         __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
102 }
103
104 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
105 {
106         int i;
107
108         for (i = 0; apic_probe[i]; ++i) {
109                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
110                         apic = apic_probe[i];
111                         printk(KERN_INFO "Setting APIC routing to %s.\n",
112                                 apic->name);
113                         return 1;
114                 }
115         }
116         return 0;
117 }