x86, mce: clean up mce_64.c
This file has been modified many times along the years, by multiple authors, so the general style and structure has diverged in a number of areas making this file hard to read. So fix the coding style match that of the rest of the x86 arch code. [ Impact: cleanup ] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Ingo Molnar
H. Peter Anvin
parent
13503fa913
commit
e9eee03e99
1 changed files with 156 additions and 105 deletions
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@ -1,46 +1,47 @@
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/*
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* Machine check handler.
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*
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* K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs.
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* Rest from unknown author(s).
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* 2004 Andi Kleen. Rewrote most of it.
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* Copyright 2008 Intel Corporation
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* Author: Andi Kleen
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/smp_lock.h>
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#include <linux/string.h>
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#include <linux/rcupdate.h>
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#include <linux/kallsyms.h>
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#include <linux/sysdev.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
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#include <linux/percpu.h>
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#include <linux/poll.h>
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#include <linux/thread_info.h>
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#include <linux/ctype.h>
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#include <linux/kmod.h>
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#include <linux/kdebug.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/capability.h>
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#include <linux/miscdevice.h>
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#include <linux/ratelimit.h>
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#include <asm/processor.h>
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#include <asm/msr.h>
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#include <asm/mce.h>
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#include <asm/uaccess.h>
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#include <asm/smp.h>
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#include <asm/idle.h>
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#include <linux/kallsyms.h>
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#include <linux/rcupdate.h>
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#include <linux/smp_lock.h>
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#include <linux/kobject.h>
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#include <linux/kdebug.h>
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#include <linux/kernel.h>
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#include <linux/percpu.h>
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#include <linux/string.h>
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#include <linux/sysdev.h>
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#include <linux/ctype.h>
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#include <linux/sched.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/poll.h>
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#include <linux/cpu.h>
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#include <linux/fs.h>
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#define MISC_MCELOG_MINOR 227
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#include <asm/processor.h>
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#include <asm/uaccess.h>
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#include <asm/idle.h>
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#include <asm/mce.h>
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#include <asm/msr.h>
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#include <asm/smp.h>
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#define MISC_MCELOG_MINOR 227
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atomic_t mce_entry;
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static int mce_dont_init;
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static int mce_dont_init;
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/*
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* Tolerant levels:
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@ -49,16 +50,16 @@ static int mce_dont_init;
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* 2: SIGBUS or log uncorrected errors (if possible), log corrected errors
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* 3: never panic or SIGBUS, log all errors (for testing only)
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*/
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static int tolerant = 1;
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static int banks;
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static u64 *bank;
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static unsigned long notify_user;
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static int rip_msr;
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static int mce_bootlog = -1;
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static atomic_t mce_events;
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static int tolerant = 1;
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static int banks;
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static u64 *bank;
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static unsigned long notify_user;
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static int rip_msr;
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static int mce_bootlog = -1;
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static atomic_t mce_events;
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static char trigger[128];
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static char *trigger_argv[2] = { trigger, NULL };
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static char trigger[128];
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static char *trigger_argv[2] = { trigger, NULL };
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static DECLARE_WAIT_QUEUE_HEAD(mce_wait);
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@ -89,19 +90,23 @@ static struct mce_log mcelog = {
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void mce_log(struct mce *mce)
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{
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unsigned next, entry;
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atomic_inc(&mce_events);
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mce->finished = 0;
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wmb();
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for (;;) {
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entry = rcu_dereference(mcelog.next);
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for (;;) {
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/* When the buffer fills up discard new entries. Assume
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that the earlier errors are the more interesting. */
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/*
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* When the buffer fills up discard new entries.
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* Assume that the earlier errors are the more
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* interesting ones:
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*/
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if (entry >= MCE_LOG_LEN) {
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set_bit(MCE_OVERFLOW, (unsigned long *)&mcelog.flags);
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return;
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}
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/* Old left over entry. Skip. */
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/* Old left over entry. Skip: */
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if (mcelog.entry[entry].finished) {
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entry++;
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continue;
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@ -264,12 +269,12 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
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* implies that most kernel services cannot be safely used. Don't even
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* think about putting a printk in there!
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*/
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void do_machine_check(struct pt_regs * regs, long error_code)
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void do_machine_check(struct pt_regs *regs, long error_code)
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{
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struct mce m, panicm;
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int panicm_found = 0;
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u64 mcestart = 0;
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int i;
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int panicm_found = 0;
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/*
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* If no_way_out gets set, there is no safe way to recover from this
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* MCE. If tolerant is cranked up, we'll try anyway.
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@ -293,6 +298,7 @@ void do_machine_check(struct pt_regs * regs, long error_code)
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mce_setup(&m);
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rdmsrl(MSR_IA32_MCG_STATUS, m.mcgstatus);
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/* if the restart IP is not valid, we're done for */
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if (!(m.mcgstatus & MCG_STATUS_RIPV))
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no_way_out = 1;
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@ -356,23 +362,29 @@ void do_machine_check(struct pt_regs * regs, long error_code)
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mce_get_rip(&m, regs);
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mce_log(&m);
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/* Did this bank cause the exception? */
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/* Assume that the bank with uncorrectable errors did it,
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and that there is only a single one. */
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if ((m.status & MCI_STATUS_UC) && (m.status & MCI_STATUS_EN)) {
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/*
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* Did this bank cause the exception?
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*
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* Assume that the bank with uncorrectable errors did it,
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* and that there is only a single one:
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*/
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if ((m.status & MCI_STATUS_UC) &&
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(m.status & MCI_STATUS_EN)) {
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panicm = m;
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panicm_found = 1;
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}
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}
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/* If we didn't find an uncorrectable error, pick
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the last one (shouldn't happen, just being safe). */
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/*
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* If we didn't find an uncorrectable error, pick
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* the last one (shouldn't happen, just being safe).
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*/
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if (!panicm_found)
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panicm = m;
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/*
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* If we have decided that we just CAN'T continue, and the user
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* has not set tolerant to an insane level, give up and die.
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* has not set tolerant to an insane level, give up and die.
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*/
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if (no_way_out && tolerant < 3)
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mce_panic("Machine check", &panicm, mcestart);
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@ -451,10 +463,9 @@ void mce_log_therm_throt_event(__u64 status)
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* poller finds an MCE, poll 2x faster. When the poller finds no more
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* errors, poll 2x slower (up to check_interval seconds).
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*/
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static int check_interval = 5 * 60; /* 5 minutes */
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static DEFINE_PER_CPU(int, next_interval); /* in jiffies */
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static void mcheck_timer(unsigned long);
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static DEFINE_PER_CPU(struct timer_list, mce_timer);
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static void mcheck_timer(unsigned long data)
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@ -464,9 +475,10 @@ static void mcheck_timer(unsigned long data)
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WARN_ON(smp_processor_id() != data);
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if (mce_available(¤t_cpu_data))
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if (mce_available(¤t_cpu_data)) {
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machine_check_poll(MCP_TIMESTAMP,
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&__get_cpu_var(mce_poll_banks));
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}
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/*
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* Alert userspace if needed. If we logged an MCE, reduce the
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@ -501,6 +513,7 @@ int mce_notify_user(void)
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static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
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clear_thread_flag(TIF_MCE_NOTIFY);
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if (test_and_clear_bit(0, ¬ify_user)) {
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wake_up_interruptible(&mce_wait);
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@ -520,9 +533,10 @@ int mce_notify_user(void)
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return 0;
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}
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/* see if the idle task needs to notify userspace */
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/* see if the idle task needs to notify userspace: */
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static int
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mce_idle_callback(struct notifier_block *nfb, unsigned long action, void *junk)
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mce_idle_callback(struct notifier_block *nfb, unsigned long action,
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void *unused)
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{
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/* IDLE_END should be safe - interrupts are back on */
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if (action == IDLE_END && test_thread_flag(TIF_MCE_NOTIFY))
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@ -532,7 +546,7 @@ mce_idle_callback(struct notifier_block *nfb, unsigned long action, void *junk)
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}
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static struct notifier_block mce_idle_notifier = {
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.notifier_call = mce_idle_callback,
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.notifier_call = mce_idle_callback,
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};
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static __init int periodic_mcheck_init(void)
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@ -547,8 +561,8 @@ __initcall(periodic_mcheck_init);
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*/
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static int mce_cap_init(void)
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{
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u64 cap;
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unsigned b;
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u64 cap;
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rdmsrl(MSR_IA32_MCG_CAP, cap);
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b = cap & 0xff;
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@ -578,9 +592,9 @@ static int mce_cap_init(void)
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static void mce_init(void *dummy)
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{
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mce_banks_t all_banks;
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u64 cap;
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int i;
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mce_banks_t all_banks;
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/*
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* Log the machine checks left over from the previous reset.
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@ -605,14 +619,21 @@ static void mce_cpu_quirks(struct cpuinfo_x86 *c)
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{
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/* This should be disabled by the BIOS, but isn't always */
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if (c->x86_vendor == X86_VENDOR_AMD) {
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if (c->x86 == 15 && banks > 4)
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/* disable GART TBL walk error reporting, which trips off
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incorrectly with the IOMMU & 3ware & Cerberus. */
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if (c->x86 == 15 && banks > 4) {
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/*
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* disable GART TBL walk error reporting, which
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* trips off incorrectly with the IOMMU & 3ware
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* & Cerberus:
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*/
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clear_bit(10, (unsigned long *)&bank[4]);
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if(c->x86 <= 17 && mce_bootlog < 0)
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/* Lots of broken BIOS around that don't clear them
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by default and leave crap in there. Don't log. */
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}
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if (c->x86 <= 17 && mce_bootlog < 0) {
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/*
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* Lots of broken BIOS around that don't clear them
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* by default and leave crap in there. Don't log:
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*/
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mce_bootlog = 0;
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}
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}
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}
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@ -646,7 +667,7 @@ static void mce_init_timer(void)
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/*
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* Called for each booted CPU to set up machine checks.
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* Must be called with preempt off.
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* Must be called with preempt off:
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*/
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void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
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{
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@ -669,8 +690,8 @@ void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
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*/
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static DEFINE_SPINLOCK(mce_state_lock);
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static int open_count; /* #times opened */
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static int open_exclu; /* already open exclusive? */
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static int open_count; /* #times opened */
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static int open_exclu; /* already open exclusive? */
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static int mce_open(struct inode *inode, struct file *file)
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{
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@ -680,6 +701,7 @@ static int mce_open(struct inode *inode, struct file *file)
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if (open_exclu || (open_count && (file->f_flags & O_EXCL))) {
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spin_unlock(&mce_state_lock);
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unlock_kernel();
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return -EBUSY;
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}
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@ -712,13 +734,14 @@ static void collect_tscs(void *data)
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rdtscll(cpu_tsc[smp_processor_id()]);
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}
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static DEFINE_MUTEX(mce_read_mutex);
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static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
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loff_t *off)
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{
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unsigned long *cpu_tsc;
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static DEFINE_MUTEX(mce_read_mutex);
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unsigned prev, next;
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char __user *buf = ubuf;
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unsigned long *cpu_tsc;
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unsigned prev, next;
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int i, err;
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cpu_tsc = kmalloc(nr_cpu_ids * sizeof(long), GFP_KERNEL);
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@ -732,6 +755,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
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if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
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mutex_unlock(&mce_read_mutex);
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kfree(cpu_tsc);
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return -EINVAL;
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}
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@ -770,6 +794,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
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* synchronize.
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*/
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on_each_cpu(collect_tscs, cpu_tsc, 1);
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for (i = next; i < MCE_LOG_LEN; i++) {
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if (mcelog.entry[i].finished &&
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mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) {
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@ -782,6 +807,7 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
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}
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mutex_unlock(&mce_read_mutex);
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kfree(cpu_tsc);
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return err ? -EFAULT : buf - ubuf;
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}
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@ -799,6 +825,7 @@ static long mce_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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switch (cmd) {
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case MCE_GET_RECORD_LEN:
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return put_user(sizeof(struct mce), p);
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@ -810,6 +837,7 @@ static long mce_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
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do {
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flags = mcelog.flags;
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} while (cmpxchg(&mcelog.flags, flags, 0) != flags);
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return put_user(flags, p);
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}
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default:
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@ -818,11 +846,11 @@ static long mce_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
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}
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static const struct file_operations mce_chrdev_ops = {
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.open = mce_open,
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.release = mce_release,
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.read = mce_read,
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.poll = mce_poll,
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.unlocked_ioctl = mce_ioctl,
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.open = mce_open,
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.release = mce_release,
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.read = mce_read,
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.poll = mce_poll,
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.unlocked_ioctl = mce_ioctl,
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};
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static struct miscdevice mce_log_device = {
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@ -891,13 +919,16 @@ static int mce_shutdown(struct sys_device *dev)
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return mce_disable();
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}
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/* On resume clear all MCE state. Don't want to see leftovers from the BIOS.
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Only one CPU is active at this time, the others get readded later using
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CPU hotplug. */
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/*
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* On resume clear all MCE state. Don't want to see leftovers from the BIOS.
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* Only one CPU is active at this time, the others get re-added later using
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* CPU hotplug:
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*/
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static int mce_resume(struct sys_device *dev)
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{
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mce_init(NULL);
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mce_cpu_features(¤t_cpu_data);
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return 0;
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}
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@ -916,14 +947,16 @@ static void mce_restart(void)
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}
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static struct sysdev_class mce_sysclass = {
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.suspend = mce_suspend,
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.shutdown = mce_shutdown,
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.resume = mce_resume,
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.name = "machinecheck",
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.suspend = mce_suspend,
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.shutdown = mce_shutdown,
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.resume = mce_resume,
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.name = "machinecheck",
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};
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DEFINE_PER_CPU(struct sys_device, device_mce);
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void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu) __cpuinitdata;
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__cpuinitdata
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void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu);
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/* Why are there no generic functions for this? */
|
||||
#define ACCESSOR(name, var, start) \
|
||||
|
|
@ -937,9 +970,12 @@ void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu) __cpuinit
|
|||
const char *buf, size_t siz) { \
|
||||
char *end; \
|
||||
unsigned long new = simple_strtoul(buf, &end, 0); \
|
||||
if (end == buf) return -EINVAL; \
|
||||
\
|
||||
if (end == buf) \
|
||||
return -EINVAL; \
|
||||
var = new; \
|
||||
start; \
|
||||
\
|
||||
return end-buf; \
|
||||
} \
|
||||
static SYSDEV_ATTR(name, 0644, show_ ## name, set_ ## name);
|
||||
|
|
@ -950,6 +986,7 @@ static ssize_t show_bank(struct sys_device *s, struct sysdev_attribute *attr,
|
|||
char *buf)
|
||||
{
|
||||
u64 b = bank[attr - bank_attrs];
|
||||
|
||||
return sprintf(buf, "%llx\n", b);
|
||||
}
|
||||
|
||||
|
|
@ -958,15 +995,18 @@ static ssize_t set_bank(struct sys_device *s, struct sysdev_attribute *attr,
|
|||
{
|
||||
char *end;
|
||||
u64 new = simple_strtoull(buf, &end, 0);
|
||||
|
||||
if (end == buf)
|
||||
return -EINVAL;
|
||||
|
||||
bank[attr - bank_attrs] = new;
|
||||
mce_restart();
|
||||
|
||||
return end-buf;
|
||||
}
|
||||
|
||||
static ssize_t show_trigger(struct sys_device *s, struct sysdev_attribute *attr,
|
||||
char *buf)
|
||||
static ssize_t
|
||||
show_trigger(struct sys_device *s, struct sysdev_attribute *attr, char *buf)
|
||||
{
|
||||
strcpy(buf, trigger);
|
||||
strcat(buf, "\n");
|
||||
|
|
@ -974,21 +1014,27 @@ static ssize_t show_trigger(struct sys_device *s, struct sysdev_attribute *attr,
|
|||
}
|
||||
|
||||
static ssize_t set_trigger(struct sys_device *s, struct sysdev_attribute *attr,
|
||||
const char *buf,size_t siz)
|
||||
const char *buf, size_t siz)
|
||||
{
|
||||
char *p;
|
||||
int len;
|
||||
|
||||
strncpy(trigger, buf, sizeof(trigger));
|
||||
trigger[sizeof(trigger)-1] = 0;
|
||||
len = strlen(trigger);
|
||||
p = strchr(trigger, '\n');
|
||||
if (*p) *p = 0;
|
||||
|
||||
if (*p)
|
||||
*p = 0;
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static SYSDEV_ATTR(trigger, 0644, show_trigger, set_trigger);
|
||||
static SYSDEV_INT_ATTR(tolerant, 0644, tolerant);
|
||||
ACCESSOR(check_interval,check_interval,mce_restart())
|
||||
|
||||
ACCESSOR(check_interval, check_interval, mce_restart())
|
||||
|
||||
static struct sysdev_attribute *mce_attributes[] = {
|
||||
&attr_tolerant.attr, &attr_check_interval, &attr_trigger,
|
||||
NULL
|
||||
|
|
@ -996,7 +1042,7 @@ static struct sysdev_attribute *mce_attributes[] = {
|
|||
|
||||
static cpumask_var_t mce_device_initialized;
|
||||
|
||||
/* Per cpu sysdev init. All of the cpus still share the same ctl bank */
|
||||
/* Per cpu sysdev init. All of the cpus still share the same ctrl bank: */
|
||||
static __cpuinit int mce_create_device(unsigned int cpu)
|
||||
{
|
||||
int err;
|
||||
|
|
@ -1006,15 +1052,15 @@ static __cpuinit int mce_create_device(unsigned int cpu)
|
|||
return -EIO;
|
||||
|
||||
memset(&per_cpu(device_mce, cpu).kobj, 0, sizeof(struct kobject));
|
||||
per_cpu(device_mce,cpu).id = cpu;
|
||||
per_cpu(device_mce,cpu).cls = &mce_sysclass;
|
||||
per_cpu(device_mce, cpu).id = cpu;
|
||||
per_cpu(device_mce, cpu).cls = &mce_sysclass;
|
||||
|
||||
err = sysdev_register(&per_cpu(device_mce,cpu));
|
||||
err = sysdev_register(&per_cpu(device_mce, cpu));
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
for (i = 0; mce_attributes[i]; i++) {
|
||||
err = sysdev_create_file(&per_cpu(device_mce,cpu),
|
||||
err = sysdev_create_file(&per_cpu(device_mce, cpu),
|
||||
mce_attributes[i]);
|
||||
if (err)
|
||||
goto error;
|
||||
|
|
@ -1035,10 +1081,10 @@ static __cpuinit int mce_create_device(unsigned int cpu)
|
|||
}
|
||||
error:
|
||||
while (--i >= 0) {
|
||||
sysdev_remove_file(&per_cpu(device_mce,cpu),
|
||||
sysdev_remove_file(&per_cpu(device_mce, cpu),
|
||||
mce_attributes[i]);
|
||||
}
|
||||
sysdev_unregister(&per_cpu(device_mce,cpu));
|
||||
sysdev_unregister(&per_cpu(device_mce, cpu));
|
||||
|
||||
return err;
|
||||
}
|
||||
|
|
@ -1051,12 +1097,12 @@ static __cpuinit void mce_remove_device(unsigned int cpu)
|
|||
return;
|
||||
|
||||
for (i = 0; mce_attributes[i]; i++)
|
||||
sysdev_remove_file(&per_cpu(device_mce,cpu),
|
||||
sysdev_remove_file(&per_cpu(device_mce, cpu),
|
||||
mce_attributes[i]);
|
||||
for (i = 0; i < banks; i++)
|
||||
sysdev_remove_file(&per_cpu(device_mce, cpu),
|
||||
&bank_attrs[i]);
|
||||
sysdev_unregister(&per_cpu(device_mce,cpu));
|
||||
sysdev_unregister(&per_cpu(device_mce, cpu));
|
||||
cpumask_clear_cpu(cpu, mce_device_initialized);
|
||||
}
|
||||
|
||||
|
|
@ -1076,11 +1122,12 @@ static void mce_disable_cpu(void *h)
|
|||
|
||||
static void mce_reenable_cpu(void *h)
|
||||
{
|
||||
int i;
|
||||
unsigned long action = *(unsigned long *)h;
|
||||
int i;
|
||||
|
||||
if (!mce_available(¤t_cpu_data))
|
||||
return;
|
||||
|
||||
if (!(action & CPU_TASKS_FROZEN))
|
||||
cmci_reenable();
|
||||
for (i = 0; i < banks; i++)
|
||||
|
|
@ -1088,8 +1135,8 @@ static void mce_reenable_cpu(void *h)
|
|||
}
|
||||
|
||||
/* Get notified when a cpu comes on/off. Be hotplug friendly. */
|
||||
static int __cpuinit mce_cpu_callback(struct notifier_block *nfb,
|
||||
unsigned long action, void *hcpu)
|
||||
static int __cpuinit
|
||||
mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
|
||||
{
|
||||
unsigned int cpu = (unsigned long)hcpu;
|
||||
struct timer_list *t = &per_cpu(mce_timer, cpu);
|
||||
|
|
@ -1142,12 +1189,14 @@ static __init int mce_init_banks(void)
|
|||
|
||||
for (i = 0; i < banks; i++) {
|
||||
struct sysdev_attribute *a = &bank_attrs[i];
|
||||
a->attr.name = kasprintf(GFP_KERNEL, "bank%d", i);
|
||||
|
||||
a->attr.name = kasprintf(GFP_KERNEL, "bank%d", i);
|
||||
if (!a->attr.name)
|
||||
goto nomem;
|
||||
a->attr.mode = 0644;
|
||||
a->show = show_bank;
|
||||
a->store = set_bank;
|
||||
|
||||
a->attr.mode = 0644;
|
||||
a->show = show_bank;
|
||||
a->store = set_bank;
|
||||
}
|
||||
return 0;
|
||||
|
||||
|
|
@ -1156,6 +1205,7 @@ static __init int mce_init_banks(void)
|
|||
kfree(bank_attrs[i].attr.name);
|
||||
kfree(bank_attrs);
|
||||
bank_attrs = NULL;
|
||||
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
|
|
@ -1185,6 +1235,7 @@ static __init int mce_init_device(void)
|
|||
|
||||
register_hotcpu_notifier(&mce_cpu_notifier);
|
||||
misc_register(&mce_log_device);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue