Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Non Fatal Machine Check Exception Reporting | |
3 | * | |
4 | * (C) Copyright 2002 Dave Jones. <davej@codemonkey.org.uk> | |
5 | * | |
6 | * This file contains routines to check for non-fatal MCEs every 15s | |
7 | * | |
8 | */ | |
9 | ||
10 | #include <linux/init.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/jiffies.h> | |
1da177e4 LT |
14 | #include <linux/workqueue.h> |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/smp.h> | |
17 | #include <linux/module.h> | |
18 | ||
19 | #include <asm/processor.h> | |
20 | #include <asm/system.h> | |
21 | #include <asm/msr.h> | |
22 | ||
23 | #include "mce.h" | |
24 | ||
25 | static int firstbank; | |
26 | ||
27 | #define MCE_RATE 15*HZ /* timer rate is 15s */ | |
28 | ||
29 | static void mce_checkregs (void *info) | |
30 | { | |
31 | u32 low, high; | |
32 | int i; | |
33 | ||
34 | for (i=firstbank; i<nr_mce_banks; i++) { | |
35 | rdmsr (MSR_IA32_MC0_STATUS+i*4, low, high); | |
36 | ||
37 | if (high & (1<<31)) { | |
38 | printk(KERN_INFO "MCE: The hardware reports a non " | |
39 | "fatal, correctable incident occurred on " | |
40 | "CPU %d.\n", | |
41 | smp_processor_id()); | |
42 | printk (KERN_INFO "Bank %d: %08x%08x\n", i, high, low); | |
43 | ||
44 | /* Scrub the error so we don't pick it up in MCE_RATE seconds time. */ | |
45 | wrmsr (MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL); | |
46 | ||
47 | /* Serialize */ | |
48 | wmb(); | |
49 | add_taint(TAINT_MACHINE_CHECK); | |
50 | } | |
51 | } | |
52 | } | |
53 | ||
c4028958 DH |
54 | static void mce_work_fn(struct work_struct *work); |
55 | static DECLARE_DELAYED_WORK(mce_work, mce_work_fn); | |
1da177e4 | 56 | |
c4028958 | 57 | static void mce_work_fn(struct work_struct *work) |
1da177e4 LT |
58 | { |
59 | on_each_cpu(mce_checkregs, NULL, 1, 1); | |
60 | schedule_delayed_work(&mce_work, MCE_RATE); | |
61 | } | |
62 | ||
63 | static int __init init_nonfatal_mce_checker(void) | |
64 | { | |
65 | struct cpuinfo_x86 *c = &boot_cpu_data; | |
66 | ||
67 | /* Check for MCE support */ | |
68 | if (!cpu_has(c, X86_FEATURE_MCE)) | |
69 | return -ENODEV; | |
70 | ||
71 | /* Check for PPro style MCA */ | |
72 | if (!cpu_has(c, X86_FEATURE_MCA)) | |
73 | return -ENODEV; | |
74 | ||
75 | /* Some Athlons misbehave when we frob bank 0 */ | |
76 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
77 | boot_cpu_data.x86 == 6) | |
78 | firstbank = 1; | |
79 | else | |
80 | firstbank = 0; | |
81 | ||
82 | /* | |
83 | * Check for non-fatal errors every MCE_RATE s | |
84 | */ | |
85 | schedule_delayed_work(&mce_work, MCE_RATE); | |
86 | printk(KERN_INFO "Machine check exception polling timer started.\n"); | |
87 | return 0; | |
88 | } | |
89 | module_init(init_nonfatal_mce_checker); | |
90 | ||
91 | MODULE_LICENSE("GPL"); |