Merge branch 'irq/sparseirq' into cpus4096
[linux-2.6] / arch / x86 / mach-generic / probe.c
1 /*
2  * Copyright 2003 Andi Kleen, SuSE Labs.
3  * Subject to the GNU Public License, v.2
4  *
5  * Generic x86 APIC driver probe layer.
6  */
7 #include <linux/threads.h>
8 #include <linux/cpumask.h>
9 #include <linux/string.h>
10 #include <linux/kernel.h>
11 #include <linux/ctype.h>
12 #include <linux/init.h>
13 #include <linux/errno.h>
14 #include <asm/fixmap.h>
15 #include <asm/mpspec.h>
16 #include <asm/apicdef.h>
17 #include <asm/genapic.h>
18 #include <asm/setup.h>
19
20 extern struct genapic apic_numaq;
21 extern struct genapic apic_summit;
22 extern struct genapic apic_bigsmp;
23 extern struct genapic apic_es7000;
24 extern struct genapic apic_default;
25
26 struct genapic *genapic = &apic_default;
27
28 static struct genapic *apic_probe[] __initdata = {
29 #ifdef CONFIG_X86_NUMAQ
30         &apic_numaq,
31 #endif
32 #ifdef CONFIG_X86_SUMMIT
33         &apic_summit,
34 #endif
35 #ifdef CONFIG_X86_BIGSMP
36         &apic_bigsmp,
37 #endif
38 #ifdef CONFIG_X86_ES7000
39         &apic_es7000,
40 #endif
41         &apic_default,  /* must be last */
42         NULL,
43 };
44
45 static int cmdline_apic __initdata;
46 static int __init parse_apic(char *arg)
47 {
48         int i;
49
50         if (!arg)
51                 return -EINVAL;
52
53         for (i = 0; apic_probe[i]; i++) {
54                 if (!strcmp(apic_probe[i]->name, arg)) {
55                         genapic = apic_probe[i];
56                         cmdline_apic = 1;
57                         return 0;
58                 }
59         }
60
61         if (x86_quirks->update_genapic)
62                 x86_quirks->update_genapic();
63
64         /* Parsed again by __setup for debug/verbose */
65         return 0;
66 }
67 early_param("apic", parse_apic);
68
69 void __init generic_bigsmp_probe(void)
70 {
71 #ifdef CONFIG_X86_BIGSMP
72         /*
73          * This routine is used to switch to bigsmp mode when
74          * - There is no apic= option specified by the user
75          * - generic_apic_probe() has chosen apic_default as the sub_arch
76          * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
77          */
78
79         if (!cmdline_apic && genapic == &apic_default) {
80                 if (apic_bigsmp.probe()) {
81                         genapic = &apic_bigsmp;
82                         if (x86_quirks->update_genapic)
83                                 x86_quirks->update_genapic();
84                         printk(KERN_INFO "Overriding APIC driver with %s\n",
85                                genapic->name);
86                 }
87         }
88 #endif
89 }
90
91 void __init generic_apic_probe(void)
92 {
93         if (!cmdline_apic) {
94                 int i;
95                 for (i = 0; apic_probe[i]; i++) {
96                         if (apic_probe[i]->probe()) {
97                                 genapic = apic_probe[i];
98                                 break;
99                         }
100                 }
101                 /* Not visible without early console */
102                 if (!apic_probe[i])
103                         panic("Didn't find an APIC driver");
104
105                 if (x86_quirks->update_genapic)
106                         x86_quirks->update_genapic();
107         }
108         printk(KERN_INFO "Using APIC driver %s\n", genapic->name);
109 }
110
111 /* These functions can switch the APIC even after the initial ->probe() */
112
113 int __init mps_oem_check(struct mp_config_table *mpc, char *oem,
114                                  char *productid)
115 {
116         int i;
117         for (i = 0; apic_probe[i]; ++i) {
118                 if (apic_probe[i]->mps_oem_check(mpc, oem, productid)) {
119                         if (!cmdline_apic) {
120                                 genapic = apic_probe[i];
121                                 if (x86_quirks->update_genapic)
122                                         x86_quirks->update_genapic();
123                                 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
124                                        genapic->name);
125                         }
126                         return 1;
127                 }
128         }
129         return 0;
130 }
131
132 int __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
133 {
134         int i;
135         for (i = 0; apic_probe[i]; ++i) {
136                 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) {
137                         if (!cmdline_apic) {
138                                 genapic = apic_probe[i];
139                                 if (x86_quirks->update_genapic)
140                                         x86_quirks->update_genapic();
141                                 printk(KERN_INFO "Switched to APIC driver `%s'.\n",
142                                        genapic->name);
143                         }
144                         return 1;
145                 }
146         }
147         return 0;
148 }
149
150 int hard_smp_processor_id(void)
151 {
152         return genapic->get_apic_id(*(unsigned long *)(APIC_BASE+APIC_ID));
153 }