Merge branch 'for-2.6.31' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[pandora-kernel.git] / 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/mce.h>
14 #include <asm/msr.h>
15
16 /* Machine Check Handler For AMD Athlon/Duron: */
17 static void k7_machine_check(struct pt_regs *regs, long error_code)
18 {
19         u32 alow, ahigh, high, low;
20         u32 mcgstl, mcgsth;
21         int recover = 1;
22         int i;
23
24         rdmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
25         if (mcgstl & (1<<0))    /* Recoverable ? */
26                 recover = 0;
27
28         printk(KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
29                 smp_processor_id(), mcgsth, mcgstl);
30
31         for (i = 1; i < nr_mce_banks; i++) {
32                 rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high);
33                 if (high & (1<<31)) {
34                         char misc[20];
35                         char addr[24];
36
37                         misc[0] = '\0';
38                         addr[0] = '\0';
39
40                         if (high & (1<<29))
41                                 recover |= 1;
42                         if (high & (1<<25))
43                                 recover |= 2;
44                         high &= ~(1<<31);
45
46                         if (high & (1<<27)) {
47                                 rdmsr(MSR_IA32_MC0_MISC+i*4, alow, ahigh);
48                                 snprintf(misc, 20, "[%08x%08x]", ahigh, alow);
49                         }
50                         if (high & (1<<26)) {
51                                 rdmsr(MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
52                                 snprintf(addr, 24, " at %08x%08x", ahigh, alow);
53                         }
54
55                         printk(KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
56                                 smp_processor_id(), i, high, low, misc, addr);
57
58                         /* Clear it: */
59                         wrmsr(MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
60                         /* Serialize: */
61                         wmb();
62                         add_taint(TAINT_MACHINE_CHECK);
63                 }
64         }
65
66         if (recover & 2)
67                 panic("CPU context corrupt");
68         if (recover & 1)
69                 panic("Unable to continue");
70
71         printk(KERN_EMERG "Attempting to continue.\n");
72
73         mcgstl &= ~(1<<2);
74         wrmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
75 }
76
77
78 /* AMD K7 machine check is Intel like: */
79 void amd_mcheck_init(struct cpuinfo_x86 *c)
80 {
81         u32 l, h;
82         int i;
83
84         if (!cpu_has(c, X86_FEATURE_MCE))
85                 return;
86
87         machine_check_vector = k7_machine_check;
88         /* Make sure the vector pointer is visible before we enable MCEs: */
89         wmb();
90
91         printk(KERN_INFO "Intel machine check architecture supported.\n");
92
93         rdmsr(MSR_IA32_MCG_CAP, l, h);
94         if (l & (1<<8)) /* Control register present ? */
95                 wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
96         nr_mce_banks = l & 0xff;
97
98         /*
99          * Clear status for MC index 0 separately, we don't touch CTL,
100          * as some K7 Athlons cause spurious MCEs when its enabled:
101          */
102         if (boot_cpu_data.x86 == 6) {
103                 wrmsr(MSR_IA32_MC0_STATUS, 0x0, 0x0);
104                 i = 1;
105         } else
106                 i = 0;
107
108         for (; i < nr_mce_banks; i++) {
109                 wrmsr(MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
110                 wrmsr(MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
111         }
112
113         set_in_cr4(X86_CR4_MCE);
114         printk(KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
115                 smp_processor_id());
116 }