projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Non Fatal Machine Check Exception Reporting | |
| 3 | * | |
| f4432c5c | 4 | * (C) Copyright 2002 Dave Jones. <davej@redhat.com> |
| 1da177e4 LT |
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 | ||
| 714a9ac2 | 19 | #include <asm/processor.h> |
| 1da177e4 LT |
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 | ||
| 714a9ac2 | 29 | static void mce_checkregs(void *info) |
| 1da177e4 LT |
30 | { |
| 31 | u32 low, high; | |
| 32 | int i; | |
| 33 | ||
| 714a9ac2 PC |
34 | for (i = firstbank; i < nr_mce_banks; i++) { |
| 35 | rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high); | |
| 1da177e4 LT |
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()); | |
| 714a9ac2 | 42 | printk(KERN_INFO "Bank %d: %08x%08x\n", i, high, low); |
| 1da177e4 | 43 | |
| 714a9ac2 PC |
44 | /* |
| 45 | * Scrub the error so we don't pick it up in MCE_RATE | |
| 46 | * seconds time. | |
| 47 | */ | |
| 48 | wrmsr(MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL); | |
| 1da177e4 LT |
49 | |
| 50 | /* Serialize */ | |
| 51 | wmb(); | |
| 52 | add_taint(TAINT_MACHINE_CHECK); | |
| 53 | } | |
| 54 | } | |
| 55 | } | |
| 56 | ||
| c4028958 DH |
57 | static void mce_work_fn(struct work_struct *work); |
| 58 | static DECLARE_DELAYED_WORK(mce_work, mce_work_fn); | |
| 1da177e4 | 59 | |
| c4028958 | 60 | static void mce_work_fn(struct work_struct *work) |
| 714a9ac2 | 61 | { |
| 15c8b6c1 | 62 | on_each_cpu(mce_checkregs, NULL, 1); |
| 22293e58 | 63 | schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE)); |
| 714a9ac2 | 64 | } |
| 1da177e4 LT |
65 | |
| 66 | static int __init init_nonfatal_mce_checker(void) | |
| 67 | { | |
| 68 | struct cpuinfo_x86 *c = &boot_cpu_data; | |
| 69 | ||
| 70 | /* Check for MCE support */ | |
| 71 | if (!cpu_has(c, X86_FEATURE_MCE)) | |
| 72 | return -ENODEV; | |
| 73 | ||
| 74 | /* Check for PPro style MCA */ | |
| 75 | if (!cpu_has(c, X86_FEATURE_MCA)) | |
| 76 | return -ENODEV; | |
| 77 | ||
| 78 | /* Some Athlons misbehave when we frob bank 0 */ | |
| 79 | if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD && | |
| 80 | boot_cpu_data.x86 == 6) | |
| 81 | firstbank = 1; | |
| 82 | else | |
| 83 | firstbank = 0; | |
| 84 | ||
| 85 | /* | |
| 86 | * Check for non-fatal errors every MCE_RATE s | |
| 87 | */ | |
| 22293e58 | 88 | schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE)); |
| 1da177e4 LT |
89 | printk(KERN_INFO "Machine check exception polling timer started.\n"); |
| 90 | return 0; | |
| 91 | } | |
| 92 | module_init(init_nonfatal_mce_checker); | |
| 93 | ||
| 94 | MODULE_LICENSE("GPL"); |