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