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
apicid_phys_pkg_id(int initial_apic_id,int index_msb)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 */
default_setup_apic_routing(void)55 void __init default_setup_apic_routing(void)
56 {
57
58 enable_IR_x2apic();
59
60 #ifdef CONFIG_X86_X2APIC
61 if (x2apic_mode
62 #ifdef CONFIG_X86_UV
63 && apic != &apic_x2apic_uv_x
64 #endif
65 ) {
66 if (x2apic_phys)
67 apic = &apic_x2apic_phys;
68 else
69 apic = &apic_x2apic_cluster;
70 }
71 #endif
72
73 if (apic == &apic_flat && num_possible_cpus() > 8)
74 apic = &apic_physflat;
75
76 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name);
77
78 if (is_vsmp_box()) {
79 /* need to update phys_pkg_id */
80 apic->phys_pkg_id = apicid_phys_pkg_id;
81 }
82 }
83
84 /* Same for both flat and physical. */
85
apic_send_IPI_self(int vector)86 void apic_send_IPI_self(int vector)
87 {
88 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL);
89 }
90
default_acpi_madt_oem_check(char * oem_id,char * oem_table_id)91 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
92 {
93 int i;
94
95 for (i = 0; apic_probe[i]; ++i) {
96 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
97 apic = apic_probe[i];
98 printk(KERN_INFO "Setting APIC routing to %s.\n",
99 apic->name);
100 return 1;
101 }
102 }
103 return 0;
104 }
105