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>
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
54 static void mce_work_fn(struct work_struct *work);
55 static DECLARE_DELAYED_WORK(mce_work, mce_work_fn);
56
57 static void mce_work_fn(struct work_struct *work)
58 {
59 on_each_cpu(mce_checkregs, NULL, 1, 1);
60 schedule_delayed_work(&mce_work, round_jiffies_relative(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, round_jiffies_relative(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");
92
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