Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild...
[linux-2.6] / arch / x86 / kernel / cpu / mcheck / k7.c
1 /*
2  * Athlon specific Machine Check Exception Reporting
3  * (C) Copyright 2002 Dave Jones <davej@redhat.com>
4  */
5 #include <linux/interrupt.h>
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/init.h>
9 #include <linux/smp.h>
10
11 #include <asm/processor.h>
12 #include <asm/system.h>
13 #include <asm/msr.h>
14
15 #include "mce.h"
16
17 /* Machine Check Handler For AMD Athlon/Duron: */
18 static void k7_machine_check(struct pt_regs *regs, long error_code)
19 {
20         u32 alow, ahigh, high, low;
21         u32 mcgstl, mcgsth;
22         int recover = 1;
23         int i;
24
25         rdmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
26         if (mcgstl & (1<<0))    /* Recoverable ? */
27                 recover = 0;
28
29         printk(KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
30                 smp_processor_id(), mcgsth, mcgstl);
31
32         for (i = 1; i < nr_mce_banks; i++) {
33                 rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high);
34                 if (high & (1<<31)) {
35                         char misc[20];
36                         char addr[24];
37
38                         misc[0] = '\0';
39                         addr[0] = '\0';
40
41                         if (high & (1<<29))
42                                 recover |= 1;
43                         if (high & (1<<25))
44                                 recover |= 2;
45                         high &= ~(1<<31);
46
47                         if (high & (1<<27)) {
48                                 rdmsr(MSR_IA32_MC0_MISC+i*4, alow, ahigh);
49                                 snprintf(misc, 20, "[%08x%08x]", ahigh, alow);
50                         }
51                         if (high & (1<<26)) {
52                                 rdmsr(MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
53                                 snprintf(addr, 24, " at %08x%08x", ahigh, alow);
54                         }
55
56                         printk(KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
57                                 smp_processor_id(), i, high, low, misc, addr);
58
59                         /* Clear it: */
60                         wrmsr(MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
61                         /* Serialize: */
62                         wmb();
63                         add_taint(TAINT_MACHINE_CHECK);
64                 }
65         }
66
67         if (recover & 2)
68                 panic("CPU context corrupt");
69         if (recover & 1)
70                 panic("Unable to continue");
71
72         printk(KERN_EMERG "Attempting to continue.\n");
73
74         mcgstl &= ~(1<<2);
75         wrmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
76 }
77
78
79 /* AMD K7 machine check is Intel like: */
80 void amd_mcheck_init(struct cpuinfo_x86 *c)
81 {
82         u32 l, h;
83         int i;
84
85         if (!cpu_has(c, X86_FEATURE_MCE))
86                 return;
87
88         machine_check_vector = k7_machine_check;
89         /* Make sure the vector pointer is visible before we enable MCEs: */
90         wmb();
91
92         printk(KERN_INFO "Intel machine check architecture supported.\n");
93
94         rdmsr(MSR_IA32_MCG_CAP, l, h);
95         if (l & (1<<8)) /* Control register present ? */
96                 wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
97         nr_mce_banks = l & 0xff;
98
99         /*
100          * Clear status for MC index 0 separately, we don't touch CTL,
101          * as some K7 Athlons cause spurious MCEs when its enabled:
102          */
103         if (boot_cpu_data.x86 == 6) {
104                 wrmsr(MSR_IA32_MC0_STATUS, 0x0, 0x0);
105                 i = 1;
106         } else
107                 i = 0;
108
109         for (; i < nr_mce_banks; i++) {
110                 wrmsr(MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
111                 wrmsr(MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
112         }
113
114         set_in_cr4(X86_CR4_MCE);
115         printk(KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
116                 smp_processor_id());
117 }