Release 4.11 arch/x86/kernel/cpu/mcheck/mce.c

/*
 * Machine check handler.
 *
 * K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs.
 * Rest from unknown author(s).
 * 2004 Andi Kleen. Rewrote most of it.
 * Copyright 2008 Intel Corporation
 * Author: Andi Kleen
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/thread_info.h>
#include <linux/capability.h>
#include <linux/miscdevice.h>
#include <linux/ratelimit.h>
#include <linux/kallsyms.h>
#include <linux/rcupdate.h>
#include <linux/kobject.h>
#include <linux/uaccess.h>
#include <linux/kdebug.h>
#include <linux/kernel.h>
#include <linux/percpu.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/sched.h>
#include <linux/sysfs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/poll.h>
#include <linux/nmi.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/debugfs.h>
#include <linux/irq_work.h>
#include <linux/export.h>
#include <linux/jump_label.h>

#include <asm/intel-family.h>
#include <asm/processor.h>
#include <asm/traps.h>
#include <asm/tlbflush.h>
#include <asm/mce.h>
#include <asm/msr.h>

#include "mce-internal.h"

static DEFINE_MUTEX(mce_chrdev_read_mutex);


static int mce_chrdev_open_count;	
/* #times opened */


#define mce_log_get_idx_check(p) \
({ \
        RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held() && \
                         !lockdep_is_held(&mce_chrdev_read_mutex), \
                         "suspicious mce_log_get_idx_check() usage"); \
        smp_load_acquire(&(p)); \
})


#define CREATE_TRACE_POINTS
#include <trace/events/mce.h>


#define SPINUNIT		100	
/* 100ns */

DEFINE_PER_CPU(unsigned, mce_exception_count);


struct mce_bank *mce_banks __read_mostly;

struct mce_vendor_flags mce_flags __read_mostly;


struct mca_config mca_cfg __read_mostly = {
	.bootlog  = -1,
	/*
         * Tolerant levels:
         * 0: always panic on uncorrected errors, log corrected errors
         * 1: panic or SIGBUS on uncorrected errors, log corrected errors
         * 2: SIGBUS or log uncorrected errors (if possible), log corr. errors
         * 3: never panic or SIGBUS, log all errors (for testing only)
         */
	.tolerant = 1,
	.monarch_timeout = -1
};

/* User mode helper program triggered by machine check event */

static unsigned long		mce_need_notify;

static char			mce_helper[128];

static char			*mce_helper_argv[2] = { mce_helper, NULL };

static DECLARE_WAIT_QUEUE_HEAD(mce_chrdev_wait);

static DEFINE_PER_CPU(struct mce, mces_seen);

static int			cpu_missing;

/*
 * MCA banks polled by the period polling timer for corrected events.
 * With Intel CMCI, this only has MCA banks which do not support CMCI (if any).
 */
DEFINE_PER_CPU(mce_banks_t, mce_poll_banks) = {
	[0 ... BITS_TO_LONGS(MAX_NR_BANKS)-1] = ~0UL
};

/*
 * MCA banks controlled through firmware first for corrected errors.
 * This is a global list of banks for which we won't enable CMCI and we
 * won't poll. Firmware controls these banks and is responsible for
 * reporting corrected errors through GHES. Uncorrected/recoverable
 * errors are still notified through a machine check.
 */

mce_banks_t mce_banks_ce_disabled;


static struct work_struct mce_work;

static struct irq_work mce_irq_work;


static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs);

/*
 * CPU/chipset specific EDAC code can register a notifier call here to print
 * MCE errors in a human-readable form.
 */

BLOCKING_NOTIFIER_HEAD(x86_mce_decoder_chain);

/* Do initial initialization of a struct mce */


void mce_setup(struct mce *m)
{
	memset(m, 0, sizeof(struct mce));
	m->cpu = m->extcpu = smp_processor_id();
	/* We hope get_seconds stays lockless */
	m->time = get_seconds();
	m->cpuvendor = boot_cpu_data.x86_vendor;
	m->cpuid = cpuid_eax(1);
	m->socketid = cpu_data(m->extcpu).phys_proc_id;
	m->apicid = cpu_data(m->extcpu).initial_apicid;
	rdmsrl(MSR_IA32_MCG_CAP, m->mcgcap);

	if (this_cpu_has(X86_FEATURE_INTEL_PPIN))
		rdmsrl(MSR_PPIN, m->ppin);
}

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DEFINE_PER_CPU(struct mce, injectm);

EXPORT_PER_CPU_SYMBOL_GPL(injectm);

/*
 * Lockless MCE logging infrastructure.
 * This avoids deadlocks on printk locks without having to break locks. Also
 * separate MCEs from kernel messages to avoid bogus bug reports.
 */


static struct mce_log mcelog = {
	.signature	= MCE_LOG_SIGNATURE,
	.len		= MCE_LOG_LEN,
	.recordlen	= sizeof(struct mce),
};



void mce_log(struct mce *mce)
{
	unsigned next, entry;

	/* Emit the trace record: */
	trace_mce_record(mce);

	if (!mce_gen_pool_add(mce))
		irq_work_queue(&mce_irq_work);

	wmb();
	for (;;) {
		entry = mce_log_get_idx_check(mcelog.next);
		for (;;) {

			/*
                         * When the buffer fills up discard new entries.
                         * Assume that the earlier errors are the more
                         * interesting ones:
                         */
			if (entry >= MCE_LOG_LEN) {
				set_bit(MCE_OVERFLOW,
					(unsigned long *)&mcelog.flags);
				return;
			}
			/* Old left over entry. Skip: */
			if (mcelog.entry[entry].finished) {
				entry++;
				continue;
			}
			break;
		}
		smp_rmb();
		next = entry + 1;
		if (cmpxchg(&mcelog.next, entry, next) == entry)
			break;
	}
	memcpy(mcelog.entry + entry, mce, sizeof(struct mce));
	wmb();
	mcelog.entry[entry].finished = 1;
	wmb();

	set_bit(0, &mce_need_notify);
}

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10
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1
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7
4.05%
2
11.76%
Zwane Mwaikambo
5
2.89%
1
5.88%
Borislav Petkov
5
2.89%
2
11.76%
Jeremy Fitzhardinge
5
2.89%
1
5.88%
Mike Waychison
4
2.31%
1
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Dipankar Sarma
2
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1
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Tim Hockin
2
1.16%
1
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Ingo Molnar
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void mce_inject_log(struct mce *m)
{
	mutex_lock(&mce_chrdev_read_mutex);
	mce_log(m);
	mutex_unlock(&mce_chrdev_read_mutex);
}
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EXPORT_SYMBOL_GPL(mce_inject_log);


static struct notifier_block mce_srao_nb;


static atomic_t num_notifiers;



void mce_register_decode_chain(struct notifier_block *nb)
{
	atomic_inc(&num_notifiers);

	WARN_ON(nb->priority > MCE_PRIO_LOWEST && nb->priority < MCE_PRIO_EDAC);

	blocking_notifier_chain_register(&x86_mce_decoder_chain, nb);
}
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EXPORT_SYMBOL_GPL(mce_register_decode_chain);



void mce_unregister_decode_chain(struct notifier_block *nb)
{
	atomic_dec(&num_notifiers);

	blocking_notifier_chain_unregister(&x86_mce_decoder_chain, nb);
}
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EXPORT_SYMBOL_GPL(mce_unregister_decode_chain);



static inline u32 ctl_reg(int bank)
{
	return MSR_IA32_MCx_CTL(bank);
}

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static inline u32 status_reg(int bank)
{
	return MSR_IA32_MCx_STATUS(bank);
}

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static inline u32 addr_reg(int bank)
{
	return MSR_IA32_MCx_ADDR(bank);
}

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static inline u32 misc_reg(int bank)
{
	return MSR_IA32_MCx_MISC(bank);
}

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static inline u32 smca_ctl_reg(int bank)
{
	return MSR_AMD64_SMCA_MCx_CTL(bank);
}

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static inline u32 smca_status_reg(int bank)
{
	return MSR_AMD64_SMCA_MCx_STATUS(bank);
}

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static inline u32 smca_addr_reg(int bank)
{
	return MSR_AMD64_SMCA_MCx_ADDR(bank);
}

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static inline u32 smca_misc_reg(int bank)
{
	return MSR_AMD64_SMCA_MCx_MISC(bank);
}

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struct mca_msr_regs msr_ops = {
	.ctl	= ctl_reg,
	.status	= status_reg,
	.addr	= addr_reg,
	.misc	= misc_reg
};



static void __print_mce(struct mce *m)
{
	pr_emerg(HW_ERR "CPU %d: Machine Check%s: %Lx Bank %d: %016Lx\n",
		 m->extcpu,
		 (m->mcgstatus & MCG_STATUS_MCIP ? " Exception" : ""),
		 m->mcgstatus, m->bank, m->status);

	if (m->ip) {
		pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ",
			!(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
			m->cs, m->ip);

		if (m->cs == __KERNEL_CS)
			print_symbol("{%s}", m->ip);
		pr_cont("\n");
	}

	pr_emerg(HW_ERR "TSC %llx ", m->tsc);
	if (m->addr)
		pr_cont("ADDR %llx ", m->addr);
	if (m->misc)
		pr_cont("MISC %llx ", m->misc);

	if (mce_flags.smca) {
		if (m->synd)
			pr_cont("SYND %llx ", m->synd);
		if (m->ipid)
			pr_cont("IPID %llx ", m->ipid);
	}

	pr_cont("\n");
	/*
         * Note this output is parsed by external tools and old fields
         * should not be changed.
         */
	pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n",
		m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid,
		cpu_data(m->extcpu).microcode);
}

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16
7.24%
2
11.76%
Andrew Morton
14
6.33%
1
5.88%
Ingo Molnar
8
3.62%
1
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H. Peter Anvin
6
2.71%
2
11.76%
Huang Ying
4
1.81%
1
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static void print_mce(struct mce *m)
{
	__print_mce(m);
	pr_emerg_ratelimited(HW_ERR "Run the above through 'mcelog --ascii'\n");
}

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#define PANIC_TIMEOUT 5 
/* 5 seconds */


static atomic_t mce_panicked;


static int fake_panic;

static atomic_t mce_fake_panicked;

/* Panic in progress. Enable interrupts and wait for final IPI */


static void wait_for_panic(void)
{
	long timeout = PANIC_TIMEOUT*USEC_PER_SEC;

	preempt_disable();
	local_irq_enable();
	while (timeout-- > 0)
		udelay(1);
	if (panic_timeout == 0)
		panic_timeout = mca_cfg.panic_timeout;
	panic("Panicing machine check CPU died");
}

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static void mce_panic(const char *msg, struct mce *final, char *exp)
{
	int apei_err = 0;
	struct llist_node *pending;
	struct mce_evt_llist *l;

	if (!fake_panic) {
		/*
                 * Make sure only one CPU runs in machine check panic
                 */
		if (atomic_inc_return(&mce_panicked) > 1)
			wait_for_panic();
		barrier();

		bust_spinlocks(1);
		console_verbose();
	} else {
		/* Don't log too much for fake panic */
		if (atomic_inc_return(&mce_fake_panicked) > 1)
			return;
	}
	pending = mce_gen_pool_prepare_records();
	/* First print corrected ones that are still unlogged */
	llist_for_each_entry(l, pending, llnode) {
		struct mce *m = &l->mce;
		if (!(m->status & MCI_STATUS_UC)) {
			print_mce(m);
			if (!apei_err)
				apei_err = apei_write_mce(m);
		}
	}
	/* Now print uncorrected but with the final one last */
	llist_for_each_entry(l, pending, llnode) {
		struct mce *m = &l->mce;
		if (!(m->status & MCI_STATUS_UC))
			continue;
		if (!final || mce_cmp(m, final)) {
			print_mce(m);
			if (!apei_err)
				apei_err = apei_write_mce(m);
		}
	}
	if (final) {
		print_mce(final);
		if (!apei_err)
			apei_err = apei_write_mce(final);
	}
	if (cpu_missing)
		pr_emerg(HW_ERR "Some CPUs didn't answer in synchronization\n");
	if (exp)
		pr_emerg(HW_ERR "Machine check: %s\n", exp);
	if (!fake_panic) {
		if (panic_timeout == 0)
			panic_timeout = mca_cfg.panic_timeout;
		panic(msg);
	} else
		pr_emerg(HW_ERR "Fake kernel panic: %s\n", msg);
}

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13.57%
1
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14
5.00%
1
5.56%
Borislav Petkov
6
2.14%
3
16.67%
Andrew Lutomirski
1
0.36%
1
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280
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/* Support code for software error injection */



static int msr_to_offset(u32 msr)
{
	unsigned bank = __this_cpu_read(injectm.bank);

	if (msr == mca_cfg.rip_msr)
		return offsetof(struct mce, ip);
	if (msr == msr_ops.status(bank))
		return offsetof(struct mce, status);
	if (msr == msr_ops.addr(bank))
		return offsetof(struct mce, addr);
	if (msr == msr_ops.misc(bank))
		return offsetof(struct mce, misc);
	if (msr == MSR_IA32_MCG_STATUS)
		return offsetof(struct mce, mcgstatus);
	return -1;
}

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2
1.74%
1
20.00%
Tejun Heo
1
0.87%
1
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/* MSR access wrappers used for error injection */


static u64 mce_rdmsrl(u32 msr)
{
	u64 v;

	if (__this_cpu_read(injectm.finished)) {
		int offset = msr_to_offset(msr);

		if (offset < 0)
			return 0;
		return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset);
	}

	if (rdmsrl_safe(msr, &v)) {
		WARN_ONCE(1, "mce: Unable to read MSR 0x%x!\n", msr);
		/*
                 * Return zero in case the access faulted. This should
                 * not happen normally but can happen if the CPU does
                 * something weird, or if the code is buggy.
                 */
		v = 0;
	}

	return v;
}

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21.35%
1
16.67%
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2
2.25%
1
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Christoph Lameter
2
2.25%
1
16.67%
Borislav Petkov
1
1.12%
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static void mce_wrmsrl(u32 msr, u64 v)
{
	if (__this_cpu_read(injectm.finished)) {
		int offset = msr_to_offset(msr);

		if (offset >= 0)
			*(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v;
		return;
	}
	wrmsrl(msr, v);
}

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2
3.03%
1
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/*
 * Collect all global (w.r.t. this processor) status about this machine
 * check into our "mce" struct so that we can use it later to assess
 * the severity of the problem as we read per-bank specific details.
 */


static inline void mce_gather_info(struct mce *m, struct pt_regs *regs)
{
	mce_setup(m);

	m->mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
	if (regs) {
		/*
                 * Get the address of the instruction at the time of
                 * the machine check error.
                 */
		if (m->mcgstatus & (MCG_STATUS_RIPV|MCG_STATUS_EIPV)) {
			m->ip = regs->ip;
			m->cs = regs->cs;

			/*
                         * When in VM86 mode make the cs look like ring 3
                         * always. This is a lie, but it's better than passing
                         * the additional vm86 bit around everywhere.
                         */
			if (v8086_mode(regs))
				m->cs |= 3;
		}
		/* Use accurate RIP reporting if available. */
		if (mca_cfg.rip_msr)
			m->ip = mce_rdmsrl(mca_cfg.rip_msr);
	}
}

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int mce_available(struct cpuinfo_x86 *c)
{
	if (mca_cfg.disabled)
		return 0;
	return cpu_has(c, X86_FEATURE_MCE) && cpu_has(c, X86_FEATURE_MCA);
}

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static void mce_schedule_work(void)
{
	if (!mce_gen_pool_empty())
		schedule_work(&mce_work);
}

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static void mce_irq_work_cb(struct irq_work *entry)
{
	mce_notify_irq();
	mce_schedule_work();
}

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static void mce_report_event(struct pt_regs *regs)
{
	if (regs->flags & (X86_VM_MASK|X86_EFLAGS_IF)) {
		mce_notify_irq();
		/*
                 * Triggering the work queue here is just an insurance
                 * policy in case the syscall exit notify handler
                 * doesn't run soon enough or ends up running on the
                 * wrong CPU (can happen when audit sleeps)
                 */
		mce_schedule_work();
		return;
	}

	irq_work_queue(&mce_irq_work);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
35
89.74%
3
60.00%
Hidetoshi Seto
3
7.69%
1
20.00%
Christoph Lameter
1
2.56%
1
20.00%
Total
39
100.00%
5
100.00%

/*
 * Check if the address reported by the CPU is in a format we can parse.
 * It would be possible to add code for most other cases, but all would
 * be somewhat complicated (e.g. segment offset would require an instruction
 * parser). So only support physical addresses up to page granuality for now.
 */


static int mce_usable_address(struct mce *m)
{
	if (!(m->status & MCI_STATUS_MISCV) || !(m->status & MCI_STATUS_ADDRV))
		return 0;

	/* Checks after this one are Intel-specific: */
	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
		return 1;

	if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT)
		return 0;
	if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS)
		return 0;
	return 1;
}

Contributors
Person
Tokens
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CommitProp
Borislav Petkov
77
100.00%
1
100.00%
Total
77
100.00%
1
100.00%



static int srao_decode_notifier(struct notifier_block *nb, unsigned long val,
				void *data)
{
	struct mce *mce = (struct mce *)data;
	unsigned long pfn;

	if (!mce)
		return NOTIFY_DONE;

	if (mce_usable_address(mce) && (mce->severity == MCE_AO_SEVERITY)) {
		pfn = mce->addr >> PAGE_SHIFT;
		memory_failure(pfn, MCE_VECTOR, 0);
	}

	return NOTIFY_OK;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Gong
73
91.25%
1
25.00%
Andi Kleen
3
3.75%
1
25.00%
Borislav Petkov
3
3.75%
1
25.00%
Hidetoshi Seto
1
1.25%
1
25.00%
Total
80
100.00%
4
100.00%


static struct notifier_block mce_srao_nb = {
	.notifier_call	= srao_decode_notifier,
	.priority	= MCE_PRIO_SRAO,
};



static int mce_default_notifier(struct notifier_block *nb, unsigned long val,
				void *data)
{
	struct mce *m = (struct mce *)data;

	if (!m)
		return NOTIFY_DONE;

	/*
         * Run the default notifier if we have only the SRAO
         * notifier and us registered.
         */
	if (atomic_read(&num_notifiers) > 2)
		return NOTIFY_DONE;

	/* Don't print when mcelog is running */
	if (mce_chrdev_open_count > 0)
		return NOTIFY_DONE;

	__print_mce(m);

	return NOTIFY_DONE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
61
85.92%
1
50.00%
Andi Kleen
10
14.08%
1
50.00%
Total
71
100.00%
2
100.00%


static struct notifier_block mce_default_nb = {
	.notifier_call	= mce_default_notifier,
	/* lowest prio, we want it to run last. */
	.priority	= MCE_PRIO_LOWEST,
};

/*
 * Read ADDR and MISC registers.
 */


static void mce_read_aux(struct mce *m, int i)
{
	if (m->status & MCI_STATUS_MISCV)
		m->misc = mce_rdmsrl(msr_ops.misc(i));

	if (m->status & MCI_STATUS_ADDRV) {
		m->addr = mce_rdmsrl(msr_ops.addr(i));

		/*
                 * Mask the reported address by the reported granularity.
                 */
		if (mca_cfg.ser && (m->status & MCI_STATUS_MISCV)) {
			u8 shift = MCI_MISC_ADDR_LSB(m->misc);
			m->addr >>= shift;
			m->addr <<= shift;
		}

		/*
                 * Extract [55:<lsb>] where lsb is the least significant
                 * *valid* bit of the address bits.
                 */
		if (mce_flags.smca) {
			u8 lsb = (m->addr >> 56) & 0x3f;

			m->addr &= GENMASK_ULL(55, lsb);
		}
	}

	if (mce_flags.smca) {
		m->ipid = mce_rdmsrl(MSR_AMD64_SMCA_MCx_IPID(i));

		if (m->status & MCI_STATUS_SYNDV)
			m->synd = mce_rdmsrl(MSR_AMD64_SMCA_MCx_SYND(i));
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tony Luck
90
52.33%
1
16.67%
Yazen Ghannam
79
45.93%
4
66.67%
Borislav Petkov
3
1.74%
1
16.67%
Total
172
100.00%
6
100.00%



static bool memory_error(struct mce *m)
{
	struct cpuinfo_x86 *c = &boot_cpu_data;

	if (c->x86_vendor == X86_VENDOR_AMD) {
		/* ErrCodeExt[20:16] */
		u8 xec = (m->status >> 16) & 0x1f;

		return (xec == 0x0 || xec == 0x8);
	} else if (c->x86_vendor == X86_VENDOR_INTEL) {
		/*
                 * Intel SDM Volume 3B - 15.9.2 Compound Error Codes
                 *
                 * Bit 7 of the MCACOD field of IA32_MCi_STATUS is used for
                 * indicating a memory error. Bit 8 is used for indicating a
                 * cache hierarchy error. The combination of bit 2 and bit 3
                 * is used for indicating a `generic' cache hierarchy error
                 * But we can't just blindly check the above bits, because if
                 * bit 11 is set, then it is a bus/interconnect error - and
                 * either way the above bits just gives more detail on what
                 * bus/interconnect error happened. Note that bit 12 can be
                 * ignored, as it's the "filter" bit.
                 */
		return (m->status & 0xef80) == BIT(7) ||
		       (m->status & 0xef00) == BIT(8) ||
		       (m->status & 0xeffc) == 0xc;
	}

	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Yucong
83
78.30%
1
50.00%
Borislav Petkov
23
21.70%
1
50.00%
Total
106
100.00%
2
100.00%

DEFINE_PER_CPU(unsigned, mce_poll_count);

/*
 * Poll for corrected events or events that happened before reset.
 * Those are just logged through /dev/mcelog.
 *
 * This is executed in standard interrupt context.
 *
 * Note: spec recommends to panic for fatal unsignalled
 * errors here. However this would be quite problematic --
 * we would need to reimplement the Monarch handling and
 * it would mess up the exclusion between exception handler
 * and poll hander -- * so we skip this for now.
 * These cases should not happen anyways, or only when the CPU
 * is already totally * confused. In this case it's likely it will
 * not fully execute the machine check handler either.
 */


bool machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
{
	bool error_seen = false;
	struct mce m;
	int severity;
	int i;

	this_cpu_inc(mce_poll_count);

	mce_gather_info(&m, NULL);

	if (flags & MCP_TIMESTAMP)
		m.tsc = rdtsc();

	for (i = 0; i < mca_cfg.banks; i++) {
		if (!mce_banks[i].ctl || !test_bit(i, *b))
			continue;

		m.misc = 0;
		m.addr = 0;
		m.bank = i;

		barrier();
		m.status = mce_rdmsrl(msr_ops.status(i));
		if (!(m.status & MCI_STATUS_VAL))
			continue;

		/*
                 * Uncorrected or signalled events are handled by the exception
                 * handler when it is enabled, so don't process those here.
                 *
                 * TBD do the same check for MCI_STATUS_EN here?
                 */
		if (!(flags & MCP_UC) &&
		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
			continue;

		error_seen = true;

		mce_read_aux(&m, i);

		severity = mce_severity(&m, mca_cfg.tolerant, NULL, false);

		if (severity == MCE_DEFERRED_SEVERITY && memory_error(&m))
			if (m.status & MCI_STATUS_ADDRV)
				m.severity = severity;

		/*
                 * Don't get the IP here because it's unlikely to
                 * have anything to do with the actual error location.
                 */
		if (!(flags & MCP_DONTLOG) && !mca_cfg.dont_log_ce)
			mce_log(&m);
		else if (mce_usable_address(&m)) {
			/*
                         * Although we skipped logging this, we still want
                         * to take action. Add to the pool so the registered
                         * notifiers will see it.
                         */
			if (!mce_gen_pool_add(&m))
				mce_schedule_work();
		}

		/*
                 * Clear state for this bank.
                 */
		mce_wrmsrl(msr_ops.status(i), 0);
	}

	/*
         * Don't clear MCG_STATUS here because it's only defined for
         * exceptions.
         */

	sync_core();

	return error_seen;
}
Contributors
Person
Tokens
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Commits
CommitProp
Andi Kleen
167
58.80%
9
39.13%
Chen Yucong
41
14.44%
1
4.35%
Borislav Petkov
33
11.62%
6
26.09%
Tony Luck
27
9.51%
2
8.70%
Yazen Ghannam
6
2.11%
1
4.35%
Hidetoshi Seto
5
1.76%
2
8.70%
Chen Gong
4
1.41%
1
4.35%
Alex Shi
1
0.35%
1
4.35%
Total
284
100.00%
23
100.00%


EXPORT_SYMBOL_GPL(machine_check_poll);

/*
 * Do a quick check if any of the events requires a panic.
 * This decides if we keep the events around or clear them.
 */


static int mce_no_way_out(struct mce *m, char **msg, unsigned long *validp,
			  struct pt_regs *regs)
{
	int i, ret = 0;
	char *tmp;

	for (i = 0; i < mca_cfg.banks; i++) {
		m->status = mce_rdmsrl(msr_ops.status(i));
		if (m->status & MCI_STATUS_VAL) {
			__set_bit(i, validp);
			if (quirk_no_way_out)
				quirk_no_way_out(i, m, regs);
		}

		if (mce_severity(m, mca_cfg.tolerant, &tmp, true) >= MCE_PANIC_SEVERITY) {
			*msg = tmp;
			ret = 1;
		}
	}
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
60
46.15%
3
33.33%
Tony Luck
48
36.92%
2
22.22%
Borislav Petkov
17
13.08%
2
22.22%
Yazen Ghannam
3
2.31%
1
11.11%
Chen Yucong
2
1.54%
1
11.11%
Total
130
100.00%
9
100.00%

/*
 * Variable to establish order between CPUs while scanning.
 * Each CPU spins initially until executing is equal its number.
 */

static atomic_t mce_executing;

/*
 * Defines order of CPUs on entry. First CPU becomes Monarch.
 */

static atomic_t mce_callin;

/*
 * Check if a timeout waiting for other CPUs happened.
 */


static int mce_timed_out(u64 *t, const char *msg)
{
	/*
         * The others already did panic for some reason.
         * Bail out like in a timeout.
         * rmb() to tell the compiler that system_state
         * might have been modified by someone else.
         */
	rmb();
	if (atomic_read(&mce_panicked))
		wait_for_panic();
	if (!mca_cfg.monarch_timeout)
		goto out;
	if ((s64)*t < SPINUNIT) {
		if (mca_cfg.tolerant <= 1)
			mce_panic(msg, NULL, NULL);
		cpu_missing = 1;
		return 1;
	}
	*t -= SPINUNIT;
out:
	touch_nmi_watchdog();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
77
86.52%
1
16.67%
Borislav Petkov
6
6.74%
4
66.67%
Andrew Lutomirski
6
6.74%
1
16.67%
Total
89
100.00%
6
100.00%

/*
 * The Monarch's reign.  The Monarch is the CPU who entered
 * the machine check handler first. It waits for the others to
 * raise the exception too and then grades them. When any
 * error is fatal panic. Only then let the others continue.
 *
 * The other CPUs entering the MCE handler will be controlled by the
 * Monarch. They are called Subjects.
 *
 * This way we prevent any potential data corruption in a unrecoverable case
 * and also makes sure always all CPU's errors are examined.
 *
 * Also this detects the case of a machine check event coming from outer
 * space (not detected by any CPUs) In this case some external agent wants
 * us to shut down, so panic too.
 *
 * The other CPUs might still decide to panic if the handler happens
 * in a unrecoverable place, but in this case the system is in a semi-stable
 * state and won't corrupt anything by itself. It's ok to let the others
 * continue for a bit first.
 *
 * All the spin loops have timeouts; when a timeout happens a CPU
 * typically elects itself to be Monarch.
 */


static void mce_reign(void)
{
	int cpu;
	struct mce *m = NULL;
	int global_worst = 0;
	char *msg = NULL;
	char *nmsg = NULL;

	/*
         * This CPU is the Monarch and the other CPUs have run
         * through their handlers.
         * Grade the severity of the errors of all the CPUs.
         */
	for_each_possible_cpu(cpu) {
		int severity = mce_severity(&per_cpu(mces_seen, cpu),
					    mca_cfg.tolerant,
					    &nmsg, true);
		if (severity > global_worst) {
			msg = nmsg;
			global_worst = severity;
			m = &per_cpu(mces_seen, cpu);
		}
	}

	/*
         * Cannot recover? Panic here then.
         * This dumps all the mces in the log buffer and stops the
         * other CPUs.
         */
	if (m && global_worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3)
		mce_panic("Fatal machine check", m, msg);

	/*
         * For UC somewhere we let the CPU who detects it handle it.
         * Also must let continue the others, otherwise the handling
         * CPU could deadlock on a lock.
         */

	/*
         * No machine check event found. Must be some external
         * source or one CPU is hung. Panic.
         */
	if (global_worst <= MCE_KEEP_SEVERITY && mca_cfg.tolerant < 3)
		mce_panic("Fatal machine check from unknown source", NULL, NULL);

	/*
         * Now clear all the mces_seen so that they don't reappear on
         * the next mce.
         */
	for_each_possible_cpu(cpu)
		memset(&per_cpu(mces_seen, cpu), 0, sizeof(struct mce));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
149
91.98%
1
20.00%
Borislav Petkov
6
3.70%
1
20.00%
Hidetoshi Seto
3
1.85%
1
20.00%
Chen Yucong
2
1.23%
1
20.00%
Derek Che
2
1.23%
1
20.00%
Total
162
100.00%
5
100.00%


static atomic_t global_nwo;

/*
 * Start of Monarch synchronization. This waits until all CPUs have
 * entered the exception handler and then determines if any of them
 * saw a fatal event that requires panic. Then it executes them
 * in the entry order.
 * TBD double check parallel CPU hotunplug
 */


static int mce_start(int *no_way_out)
{
	int order;
	int cpus = num_online_cpus();
	u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC;

	if (!timeout)
		return -1;

	atomic_add(*no_way_out, &global_nwo);
	/*
         * Rely on the implied barrier below, such that global_nwo
         * is updated before mce_callin.
         */
	order = atomic_inc_return(&mce_callin);

	/*
         * Wait for everyone.
         */
	while (atomic_read(&mce_callin) != cpus) {
		if (mce_timed_out(&timeout,
				  "Timeout: Not all CPUs entered broadcast exception handler")) {
			atomic_set(&global_nwo, 0);
			return -1;
		}
		ndelay(SPINUNIT);
	}

	/*
         * mce_callin should be read before global_nwo
         */
	smp_rmb();

	if (order == 1) {
		/*
                 * Monarch: Starts executing now, the others wait.
                 */
		atomic_set(&mce_executing, 1);
	} else {
		/*
                 * Subject: Now start the scanning loop one by one in
                 * the original callin order.
                 * This way when there are any shared banks it will be
                 * only seen by one CPU before cleared, avoiding duplicates.
                 */
		while (atomic_read(&mce_executing) < order) {
			if (mce_timed_out(&timeout,
					  "Timeout: Subject CPUs unable to finish machine check processing")) {
				atomic_set(&global_nwo, 0);
				return -1;
			}
			ndelay(SPINUNIT);
		}
	}

	/*
         * Cache the global no_way_out state.
         */
	*no_way_out = atomic_read(&global_nwo);

	return order;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
138
77.09%
1
14.29%
Hidetoshi Seto
22
12.29%
1
14.29%
Huang Ying
11
6.15%
1
14.29%
Andrew Lutomirski
4
2.23%
1
14.29%
Borislav Petkov
3
1.68%
2
28.57%
Davidlohr Bueso A
1
0.56%
1
14.29%
Total
179
100.00%
7
100.00%

/*
 * Synchronize between CPUs after main scanning loop.
 * This invokes the bulk of the Monarch processing.
 */


static int mce_end(int order)
{
	int ret = -1;
	u64 timeout = (u64)mca_cfg.monarch_timeout * NSEC_PER_USEC;

	if (!timeout)
		goto reset;
	if (order < 0)
		goto reset;

	/*
         * Allow others to run.
         */
	atomic_inc(&mce_executing);

	if (order == 1) {
		/* CHECKME: Can this race with a parallel hotplug? */
		int cpus = num_online_cpus();

		/*
                 * Monarch: Wait for everyone to go through their scanning
                 * loops.
                 */
		while (atomic_read(&mce_executing) <= cpus) {
			if (mce_timed_out(&timeout,
					  "Timeout: Monarch CPU unable to finish machine check processing"))
				goto reset;
			ndelay(SPINUNIT);
		}

		mce_reign();
		barrier();
		ret = 0;
	} else {
		/*
                 * Subject: Wait for Monarch to finish.
                 */
		while (atomic_read(&mce_executing) != 0) {
			if (mce_timed_out(&timeout,
					  "Timeout: Monarch CPU did not finish machine check processing"))
				goto reset;
			ndelay(SPINUNIT);
		}

		/*
                 * Don't reset anything. That's done by the Monarch.
                 */
		return 0;
	}

	/*
         * Reset all global state.
         */
reset:
	atomic_set(&global_nwo, 0);
	atomic_set(&mce_callin, 0);
	barrier();

	/*
         * Let others run again.
         */
	atomic_set(&mce_executing, 0);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
173
96.65%
1
33.33%
Andrew Lutomirski
4
2.23%
1
33.33%
Borislav Petkov
2
1.12%
1
33.33%
Total
179
100.00%
3
100.00%



static void mce_clear_state(unsigned long *toclear)
{
	int i;

	for (i = 0; i < mca_cfg.banks; i++) {
		if (test_bit(i, toclear))
			mce_wrmsrl(msr_ops.status(i), 0);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
47
90.38%
3
60.00%
Yazen Ghannam
3
5.77%
1
20.00%
Borislav Petkov
2
3.85%
1
20.00%
Total
52
100.00%
5
100.00%



static int do_memory_failure(struct mce *m)
{
	int flags = MF_ACTION_REQUIRED;
	int ret;

	pr_err("Uncorrected hardware memory error in user-access at %llx", m->addr);
	if (!(m->mcgstatus & MCG_STATUS_RIPV))
		flags |= MF_MUST_KILL;
	ret = memory_failure(m->addr >> PAGE_SHIFT, MCE_VECTOR, flags);
	if (ret)
		pr_err("Memory error not recovered");
	return ret;
}

Contributors
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Tony Luck
70
100.00%
1
100.00%
Total
70
100.00%
1
100.00%

/*
 * The actual machine check handler. This only handles real
 * exceptions when something got corrupted coming in through int 18.
 *
 * This is executed in NMI context not subject to normal locking rules. This
 * implies that most kernel services cannot be safely used. Don't even
 * think about putting a printk in there!
 *
 * On Intel systems this is entered on all CPUs in parallel through
 * MCE broadcast. However some CPUs might be broken beyond repair,
 * so be always careful when synchronizing with others.
 */


void do_machine_check(struct pt_regs *regs, long error_code)
{
	struct mca_config *cfg = &mca_cfg;
	struct mce m, *final;
	int i;
	int worst = 0;
	int severity;

	/*
         * Establish sequential order between the CPUs entering the machine
         * check handler.
         */
	int order = -1;
	/*
         * If no_way_out gets set, there is no safe way to recover from this
         * MCE.  If mca_cfg.tolerant is cranked up, we'll try anyway.
         */
	int no_way_out = 0;
	/*
         * If kill_it gets set, there might be a way to recover from this
         * error.
         */
	int kill_it = 0;
	DECLARE_BITMAP(toclear, MAX_NR_BANKS);
	DECLARE_BITMAP(valid_banks, MAX_NR_BANKS);
	char *msg = "Unknown";

	/*
         * MCEs are always local on AMD. Same is determined by MCG_STATUS_LMCES
         * on Intel.
         */
	int lmce = 1;

	/* If this CPU is offline, just bail out. */
	if (cpu_is_offline(smp_processor_id())) {
		u64 mcgstatus;

		mcgstatus = mce_rdmsrl(MSR_IA32_MCG_STATUS);
		if (mcgstatus & MCG_STATUS_RIPV) {
			mce_wrmsrl(MSR_IA32_MCG_STATUS, 0);
			return;
		}
	}

	ist_enter(regs);

	this_cpu_inc(mce_exception_count);

	if (!cfg->banks)
		goto out;

	mce_gather_info(&m, regs);
	m.tsc = rdtsc();

	final = this_cpu_ptr(&mces_seen);
	*final = m;

	memset(valid_banks, 0, sizeof(valid_banks));
	no_way_out = mce_no_way_out(&m, &msg, valid_banks, regs);

	barrier();

	/*
         * When no restart IP might need to kill or panic.
         * Assume the worst for now, but if we find the
         * severity is MCE_AR_SEVERITY we have other options.
         */
	if (!(m.mcgstatus & MCG_STATUS_RIPV))
		kill_it = 1;

	/*
         * Check if this MCE is signaled to only this logical processor,
         * on Intel only.
         */
	if (m.cpuvendor == X86_VENDOR_INTEL)
		lmce = m.mcgstatus & MCG_STATUS_LMCES;

	/*
         * Go through all banks in exclusion of the other CPUs. This way we
         * don't report duplicated events on shared banks because the first one
         * to see it will clear it. If this is a Local MCE, then no need to
         * perform rendezvous.
         */
	if (!lmce)
		order = mce_start(&no_way_out);

	for (i = 0; i < cfg->banks; i++) {
		__clear_bit(i, toclear);
		if (!test_bit(i, valid_banks))
			continue;
		if (!mce_banks[i].ctl)
			continue;

		m.misc = 0;
		m.addr = 0;
		m.bank = i;

		m.status = mce_rdmsrl(msr_ops.status(i));
		if ((m.status & MCI_STATUS_VAL) == 0)
			continue;

		/*
                 * Non uncorrected or non signaled errors are handled by
                 * machine_check_poll. Leave them alone, unless this panics.
                 */
		if (!(m.status & (cfg->ser ? MCI_STATUS_S : MCI_STATUS_UC)) &&
			!no_way_out)
			continue;

		/*
                 * Set taint even when machine check was not enabled.
                 */
		add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);

		severity = mce_severity(&m, cfg->tolerant, NULL, true);

		/*
                 * When machine check was for corrected/deferred handler don't
                 * touch, unless we're panicing.
                 */
		if ((severity == MCE_KEEP_SEVERITY ||
		     severity == MCE_UCNA_SEVERITY) && !no_way_out)
			continue;
		__set_bit(i, toclear);
		if (severity == MCE_NO_SEVERITY) {
			/*
                         * Machine check event was not enabled. Clear, but
                         * ignore.
                         */
			continue;
		}

		mce_read_aux(&m, i);

		/* assuming valid severity level != 0 */
		m.severity = severity;

		mce_log(&m);

		if (severity > worst) {
			*final = m;
			worst = severity;
		}
	}

	/* mce_clear_state will clear *final, save locally for use later */
	m = *final;

	if (!no_way_out)
		mce_clear_state(toclear);

	/*
         * Do most of the synchronization with other CPUs.
         * When there's any problem use only local no_way_out state.
         */
	if (!lmce) {
		if (mce_end(order) < 0)
			no_way_out = worst >= MCE_PANIC_SEVERITY;
	} else {
		/*
                 * Local MCE skipped calling mce_reign()
                 * If we found a fatal error, we need to panic here.
                 */
		 if (worst >= MCE_PANIC_SEVERITY && mca_cfg.tolerant < 3)
			mce_panic("Machine check from unknown source",
				NULL, NULL);
	}

	/*
         * If tolerant is at an insane level we drop requests to kill
         * processes and continue even when there is no way out.
         */
	if (cfg->tolerant == 3)
		kill_it = 0;
	else if (no_way_out)
		mce_panic("Fatal machine check on current CPU", &m, msg);

	if (worst > 0)
		mce_report_event(regs);
	mce_wrmsrl(MSR_IA32_MCG_STATUS, 0);
out:
	sync_core();

	if (worst != MCE_AR_SEVERITY && !kill_it)
		goto out_ist;

	/* Fault was in user mode and we need to take some action */
	if ((m.cs & 3) == 3) {
		ist_begin_non_atomic(regs);
		local_irq_enable();

		if (kill_it || do_memory_failure(&m))
			force_sig(SIGBUS, current);
		local_irq_disable();
		ist_end_non_atomic();
	} else {
		if (!fixup_exception(regs, X86_TRAP_MC))
			mce_panic("Failed kernel mode recovery", &m, NULL);
	}

out_ist:
	ist_exit(regs);
}
Contributors
Person
Tokens
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CommitProp
Andi Kleen
319
48.33%
22
46.81%
Tony Luck
140
21.21%
6
12.77%
Ashok Raj
81
12.27%
2
4.26%
Borislav Petkov
27
4.09%
3
6.38%
Yazen Ghannam
23
3.48%
2
4.26%
Hidetoshi Seto
16
2.42%
3
6.38%
Tim Hockin
16
2.42%
1
2.13%
Andrew Lutomirski
10
1.52%
1
2.13%
Chen Yucong
9
1.36%
1
2.13%
Chen Gong
6
0.91%
1
2.13%
Ingo Molnar
4
0.61%
1
2.13%
Andrew Morton
4
0.61%
1
2.13%
Christoph Lameter
2
0.30%
1
2.13%
Rusty Russell
2
0.30%
1
2.13%
Alex Shi
1
0.15%
1
2.13%
Total
660
100.00%
47
100.00%


EXPORT_SYMBOL_GPL(do_machine_check);

#ifndef CONFIG_MEMORY_FAILURE


int memory_failure(unsigned long pfn, int vector, int flags)
{
	/* mce_severity() should not hand us an ACTION_REQUIRED error */
	BUG_ON(flags & MF_ACTION_REQUIRED);
	pr_err("Uncorrected memory error in page 0x%lx ignored\n"
	       "Rebuild kernel with CONFIG_MEMORY_FAILURE=y for smarter handling\n",
	       pfn);

	return 0;
}
Contributors
Person
Tokens
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CommitProp
Tony Luck
20
58.82%
2
50.00%
Andi Kleen
13
38.24%
1
25.00%
Joe Perches
1
2.94%
1
25.00%
Total
34
100.00%
4
100.00%

#endif

/*
 * Periodic polling timer for "silent" machine check errors.  If the
 * poller finds an MCE, poll 2x faster.  When the poller finds no more
 * errors, poll 2x slower (up to check_interval seconds).
 */

static unsigned long check_interval = INITIAL_CHECK_INTERVAL;

static DEFINE_PER_CPU(unsigned long, mce_next_interval); /* in jiffies */
static DEFINE_PER_CPU(struct timer_list, mce_timer);



static unsigned long mce_adjust_timer_default(unsigned long interval)
{
	return interval;
}

Contributors
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Chen Gong
14
100.00%
1
100.00%
Total
14
100.00%
1
100.00%


static unsigned long (*mce_adjust_timer)(unsigned long interval) = mce_adjust_timer_default;



static void __start_timer(struct timer_list *t, unsigned long interval)
{
	unsigned long when = jiffies + interval;
	unsigned long flags;

	local_irq_save(flags);

	if (!timer_pending(t) || time_before(when, t->expires))
		mod_timer(t, round_jiffies(when));

	local_irq_restore(flags);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Borislav Petkov
47
73.44%
1
25.00%
Chen Gong
13
20.31%
1
25.00%
Thomas Gleixner
4
6.25%
2
50.00%
Total
64
100.00%
4
100.00%



static void mce_timer_fn(unsigned long data)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);
	int cpu = smp_processor_id();
	unsigned long iv;

	WARN_ON(cpu != data);

	iv = __this_cpu_read(mce_next_interval);

	if (mce_available(this_cpu_ptr(&cpu_info))) {
		machine_check_poll(0, this_cpu_ptr(&mce_poll_banks));

		if (mce_intel_cmci_poll()) {
			iv = mce_adjust_timer(iv);
			goto done;
		}
	}

	/*
         * Alert userspace if needed. If we logged an MCE, reduce the polling
         * interval, otherwise increase the polling interval.
         */
	if (mce_notify_irq())
		iv = max(iv / 2, (unsigned long) HZ/100);
	else
		iv = min(iv * 2, round_jiffies_relative(check_interval * HZ));

done:
	__this_cpu_write(mce_next_interval, iv);
	__start_timer(t, iv);
}

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CommitProp
Andi Kleen
45
31.69%
7
31.82%
Borislav Petkov
32
22.54%
2
9.09%
Tim Hockin
22
15.49%
2
9.09%
Thomas Gleixner
21
14.79%
2
9.09%
Chen Gong
6
4.23%
3
13.64%
Christoph Lameter
5
3.52%
1
4.55%
Venkatesh Pallipadi
3
2.11%
1
4.55%
Tejun Heo
3
2.11%
1
4.55%
Zwane Mwaikambo
3
2.11%
1
4.55%
Hidetoshi Seto
1
0.70%
1
4.55%
Ingo Molnar
1
0.70%
1
4.55%
Total
142
100.00%
22
100.00%

/*
 * Ensure that the timer is firing in @interval from now.
 */


void mce_timer_kick(unsigned long interval)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);
	unsigned long iv = __this_cpu_read(mce_next_interval);

	__start_timer(t, interval);

	if (interval < iv)
		__this_cpu_write(mce_next_interval, interval);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Gong
45
91.84%
1
25.00%
Christoph Lameter
2
4.08%
1
25.00%
Thomas Gleixner
1
2.04%
1
25.00%
Borislav Petkov
1
2.04%
1
25.00%
Total
49
100.00%
4
100.00%

/* Must not be called in IRQ context where del_timer_sync() can deadlock */


static void mce_timer_delete_all(void)
{
	int cpu;

	for_each_online_cpu(cpu)
		del_timer_sync(&per_cpu(mce_timer, cpu));
}

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Hidetoshi Seto
26
100.00%
1
100.00%
Total
26
100.00%
1
100.00%



static void mce_do_trigger(struct work_struct *work)
{
	call_usermodehelper(mce_helper, mce_helper_argv, NULL, UMH_NO_WAIT);
}

Contributors
Person
Tokens
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CommitProp
Andi Kleen
20
90.91%
1
50.00%
Hidetoshi Seto
2
9.09%
1
50.00%
Total
22
100.00%
2
100.00%

static DECLARE_WORK(mce_trigger_work, mce_do_trigger);

/*
 * Notify the user(s) about new machine check events.
 * Can be called from interrupt context, but not from machine check/NMI
 * context.
 */


int mce_notify_irq(void)
{
	/* Not more than two messages every minute */
	static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);

	if (test_and_clear_bit(0, &mce_need_notify)) {
		/* wake processes polling /dev/mcelog */
		wake_up_interruptible(&mce_chrdev_wait);

		if (mce_helper[0])
			schedule_work(&mce_trigger_work);

		if (__ratelimit(&ratelimit))
			pr_info(HW_ERR "Machine check events logged\n");

		return 1;
	}
	return 0;
}
Contributors
Person
Tokens
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CommitProp
Tim Hockin
35
48.61%
2
20.00%
Andi Kleen
21
29.17%
4
40.00%
Zwane Mwaikambo
10
13.89%
1
10.00%
Hidetoshi Seto
4
5.56%
2
20.00%
Huang Ying
2
2.78%
1
10.00%
Total
72
100.00%
10
100.00%


EXPORT_SYMBOL_GPL(mce_notify_irq);



static int __mcheck_cpu_mce_banks_init(void)
{
	int i;
	u8 num_banks = mca_cfg.banks;

	mce_banks = kzalloc(num_banks * sizeof(struct mce_bank), GFP_KERNEL);
	if (!mce_banks)
		return -ENOMEM;

	for (i = 0; i < num_banks; i++) {
		struct mce_bank *b = &mce_banks[i];

		b->ctl = -1ULL;
		b->init = 1;
	}
	return 0;
}

Contributors
Person
Tokens
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CommitProp
Andi Kleen
73
86.90%
4
57.14%
Borislav Petkov
9
10.71%
1
14.29%
Hidetoshi Seto
1
1.19%
1
14.29%
Ingo Molnar
1
1.19%
1
14.29%
Total
84
100.00%
7
100.00%

/*
 * Initialize Machine Checks for a CPU.
 */


static int __mcheck_cpu_cap_init(void)
{
	unsigned b;
	u64 cap;

	rdmsrl(MSR_IA32_MCG_CAP, cap);

	b = cap & MCG_BANKCNT_MASK;
	if (!mca_cfg.banks)
		pr_info("CPU supports %d MCE banks\n", b);

	if (b > MAX_NR_BANKS) {
		pr_warn("Using only %u machine check banks out of %u\n",
			MAX_NR_BANKS, b);
		b = MAX_NR_BANKS;
	}

	/* Don't support asymmetric configurations today */
	WARN_ON(mca_cfg.banks != 0 && b != mca_cfg.banks);
	mca_cfg.banks = b;

	if (!mce_banks) {
		int err = __mcheck_cpu_mce_banks_init();

		if (err)
			return err;
	}

	/* Use accurate RIP reporting if available. */
	if ((cap & MCG_EXT_P) && MCG_EXT_CNT(cap) >= 9)
		mca_cfg.rip_msr = MSR_IA32_MCG_EIP;

	if (cap & MCG_SER_P)
		mca_cfg.ser = true;

	return 0;
}

Contributors
Person
Tokens
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CommitProp
Andi Kleen
100
70.92%
7
38.89%
Borislav Petkov
15
10.64%
4
22.22%
Ingo Molnar
8
5.67%
2
11.11%
Roland Dreier
5
3.55%
1
5.56%
Thomas Gleixner
5
3.55%
1
5.56%
Joe Perches
4
2.84%
1
5.56%
Daniel Rahn
3
2.13%
1
5.56%
Hidetoshi Seto
1
0.71%
1
5.56%
Total
141
100.00%
18
100.00%



static void __mcheck_cpu_init_generic(void)
{
	enum mcp_flags m_fl = 0;
	mce_banks_t all_banks;
	u64 cap;

	if (!mca_cfg.bootlog)
		m_fl = MCP_DONTLOG;

	/*
         * Log the machine checks left over from the previous reset.
         */
	bitmap_fill(all_banks, MAX_NR_BANKS);
	machine_check_poll(MCP_UC | m_fl, &all_banks);

	cr4_set_bits(X86_CR4_MCE);

	rdmsrl(MSR_IA32_MCG_CAP, cap);
	if (cap & MCG_CTL_P)
		wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
}

Contributors
Person
Tokens
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CommitProp
Andi Kleen
52
68.42%
6
54.55%
Borislav Petkov
19
25.00%
2
18.18%
Ingo Molnar
3
3.95%
1
9.09%
Andrew Lutomirski
1
1.32%
1
9.09%
Aravind Gopalakrishnan
1
1.32%
1
9.09%
Total
76
100.00%
11
100.00%



static void __mcheck_cpu_init_clear_banks(void)
{
	int i;

	for (i = 0; i < mca_cfg.banks; i++) {
		struct mce_bank *b = &mce_banks[i];

		if (!b->init)
			continue;
		wrmsrl(msr_ops.ctl(i), b->ctl);
		wrmsrl(msr_ops.status(i), 0);
	}
}

Contributors
Person
Tokens
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Commits
CommitProp
Andi Kleen
49
67.12%
5
55.56%
Aravind Gopalakrishnan
10
13.70%
1
11.11%
Yazen Ghannam
6
8.22%
1
11.11%
Venkatesh Pallipadi
6
8.22%
1
11.11%
Borislav Petkov
2
2.74%
1
11.11%
Total
73
100.00%
9
100.00%

/*
 * During IFU recovery Sandy Bridge -EP4S processors set the RIPV and
 * EIPV bits in MCG_STATUS to zero on the affected logical processor (SDM
 * Vol 3B Table 15-20). But this confuses both the code that determines
 * whether the machine check occurred in kernel or user mode, and also
 * the severity assessment code. Pretend that EIPV was set, and take the
 * ip/cs values from the pt_regs that mce_gather_info() ignored earlier.
 */


static void quirk_sandybridge_ifu(int bank, struct mce *m, struct pt_regs *regs)
{
	if (bank != 0)
		return;
	if ((m->mcgstatus & (MCG_STATUS_EIPV|MCG_STATUS_RIPV)) != 0)
		return;
	if ((m->status & (MCI_STATUS_OVER|MCI_STATUS_UC|
		          MCI_STATUS_EN|MCI_STATUS_MISCV|MCI_STATUS_ADDRV|
			  MCI_STATUS_PCC|MCI_STATUS_S|MCI_STATUS_AR|
			  MCACOD)) !=
			 (MCI_STATUS_UC|MCI_STATUS_EN|
			  MCI_STATUS_MISCV|MCI_STATUS_ADDRV|MCI_STATUS_S|
			  MCI_STATUS_AR|MCACOD_INSTR))
		return;

	m->mcgstatus |= MCG_STATUS_EIPV;
	m->ip = regs->ip;
	m->cs = regs->cs;
}

Contributors
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Tony Luck
110
100.00%
1
100.00%
Total
110
100.00%
1
100.00%

/* Add per CPU specific workarounds here */


static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
{
	struct mca_config *cfg = &mca_cfg;

	if (c->x86_vendor == X86_VENDOR_UNKNOWN) {
		pr_info("unknown CPU type - not enabling MCE support\n");
		return -EOPNOTSUPP;
	}

	/* This should be disabled by the BIOS, but isn't always */
	if (c->x86_vendor == X86_VENDOR_AMD) {
		if (c->x86 == 15 && cfg->banks > 4) {
			/*
                         * disable GART TBL walk error reporting, which
                         * trips off incorrectly with the IOMMU & 3ware
                         * & Cerberus:
                         */
			clear_bit(10, (unsigned long *)&mce_banks[4].ctl);
		}
		if (c->x86 < 17 && cfg->bootlog < 0) {
			/*
                         * Lots of broken BIOS around that don't clear them
                         * by default and leave crap in there. Don't log:
                         */
			cfg->bootlog = 0;
		}
		/*
                 * Various K7s with broken bank 0 around. Always disable
                 * by default.
                 */
		if (c->x86 == 6 && cfg->banks > 0)
			mce_banks[0].ctl = 0;

		/*
                 * overflow_recov is supported for F15h Models 00h-0fh
                 * even though we don't have a CPUID bit for it.
                 */
		if (c->x86 == 0x15 && c->x86_model <= 0xf)
			mce_flags.overflow_recov = 1;

		/*
                 * Turn off MC4_MISC thresholding banks on those models since
                 * they're not supported there.
                 */
		if (c->x86 == 0x15 &&
		    (c->x86_model >= 0x10 && c->x86_model <= 0x1f)) {
			int i;
			u64 hwcr;
			bool need_toggle;
			u32 msrs[] = {
				0x00000413, /* MC4_MISC0 */
				0xc0000408, /* MC4_MISC1 */
			};

			rdmsrl(MSR_K7_HWCR, hwcr);

			/* McStatusWrEn has to be set */
			need_toggle = !(hwcr & BIT(18));

			if (need_toggle)
				wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));

			/* Clear CntP bit safely */
			for (i = 0; i < ARRAY_SIZE(msrs); i++)
				msr_clear_bit(msrs[i], 62);

			/* restore old settings */
			if (need_toggle)
				wrmsrl(MSR_K7_HWCR, hwcr);
		}
	}

	if (c->x86_vendor == X86_VENDOR_INTEL) {
		/*
                 * SDM documents that on family 6 bank 0 should not be written
                 * because it aliases to another special BIOS controlled
                 * register.
                 * But it's not aliased anymore on model 0x1a+
                 * Don't ignore bank 0 completely because there could be a
                 * valid event later, merely don't write CTL0.
                 */

		if (c->x86 == 6 && c->x86_model < 0x1A && cfg->banks > 0)
			mce_banks[0].init = 0;

		/*
                 * All newer Intel systems support MCE broadcasting. Enable
                 * synchronization with a one second timeout.
                 */
		if ((c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xe)) &&
			cfg->monarch_timeout < 0)
			cfg->monarch_timeout = USEC_PER_SEC;

		/*
                 * There are also broken BIOSes on some Pentium M and
                 * earlier systems:
                 */
		if (c->x86 == 6 && c->x86_model <= 13 && cfg->bootlog < 0)
			cfg->bootlog = 0;

		if (c->x86 == 6 && c->x86_model == 45)
			quirk_no_way_out = quirk_sandybridge_ifu;
	}
	if (cfg->monarch_timeout < 0)
		cfg->monarch_timeout = 0;
	if (cfg->bootlog != 0)
		cfg->panic_timeout = 30;

	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
Borislav Petkov
161
37.70%
6
25.00%
Andi Kleen
160
37.47%
9
37.50%
Ingo Molnar
30
7.03%
2
8.33%
Aravind Gopalakrishnan
22
5.15%
2
8.33%
Bartlomiej Zolnierkiewicz
19
4.45%
1
4.17%
Tony Luck
18
4.22%
1
4.17%
Jan Beulich
14
3.28%
1
4.17%
Jesse Larrew
2
0.47%
1
4.17%
Joe Perches
1
0.23%
1
4.17%
Total
427
100.00%
24
100.00%



static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
{
	if (c->x86 != 5)
		return 0;

	switch (c->x86_vendor) {
	case X86_VENDOR_INTEL:
		intel_p5_mcheck_init(c);
		return 1;
		break;
	case X86_VENDOR_CENTAUR:
		winchip_mcheck_init(c);
		return 1;
		break;
	default:
		return 0;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
43
70.49%
1
25.00%
Hidetoshi Seto
13
21.31%
1
25.00%
Borislav Petkov
5
8.20%
2
50.00%
Total
61
100.00%
4
100.00%



static void __mcheck_cpu_init_vendor(struct cpuinfo_x86 *c)
{
	switch (c->x86_vendor) {
	case X86_VENDOR_INTEL:
		mce_intel_feature_init(c);
		mce_adjust_timer = cmci_intel_adjust_timer;
		break;

	case X86_VENDOR_AMD: {
		mce_flags.overflow_recov = !!cpu_has(c, X86_FEATURE_OVERFLOW_RECOV);
		mce_flags.succor	 = !!cpu_has(c, X86_FEATURE_SUCCOR);
		mce_flags.smca		 = !!cpu_has(c, X86_FEATURE_SMCA);

		/*
                 * Install proper ops for Scalable MCA enabled processors
                 */
		if (mce_flags.smca) {
			msr_ops.ctl	= smca_ctl_reg;
			msr_ops.status	= smca_status_reg;
			msr_ops.addr	= smca_addr_reg;
			msr_ops.misc	= smca_misc_reg;
		}
		mce_amd_feature_init(c);

		break;
		}

	default:
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yazen Ghannam
45
38.46%
2
18.18%
Aravind Gopalakrishnan
34
29.06%
4
36.36%
Zwane Mwaikambo
29
24.79%
1
9.09%
Jacob Shin
4
3.42%
1
9.09%
Chen Gong
3
2.56%
1
9.09%
Borislav Petkov
2
1.71%
2
18.18%
Total
117
100.00%
11
100.00%



static void __mcheck_cpu_clear_vendor(struct cpuinfo_x86 *c)
{
	switch (c->x86_vendor) {
	case X86_VENDOR_INTEL:
		mce_intel_feature_clear(c);
		break;
	default:
		break;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ashok Raj
30
100.00%
1
100.00%
Total
30
100.00%
1
100.00%



static void mce_start_timer(struct timer_list *t)
{
	unsigned long iv = check_interval * HZ;

	if (mca_cfg.ignore_ce || !iv)
		return;

	this_cpu_write(mce_next_interval, iv);
	__start_timer(t, iv);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
21
48.84%
2
22.22%
Thomas Gleixner
15
34.88%
4
44.44%
Borislav Petkov
6
13.95%
2
22.22%
Hidetoshi Seto
1
2.33%
1
11.11%
Total
43
100.00%
9
100.00%



static void __mcheck_cpu_setup_timer(void)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);
	unsigned int cpu = smp_processor_id();

	setup_pinned_timer(t, mce_timer_fn, cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
35
100.00%
1
100.00%
Total
35
100.00%
1
100.00%



static void __mcheck_cpu_init_timer(void)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);
	unsigned int cpu = smp_processor_id();

	setup_pinned_timer(t, mce_timer_fn, cpu);
	mce_start_timer(t);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Thomas Gleixner
38
95.00%
2
66.67%
Christoph Lameter
2
5.00%
1
33.33%
Total
40
100.00%
3
100.00%

/* Handle unconfigured int18 (should never happen) */


static void unexpected_machine_check(struct pt_regs *regs, long error_code)
{
	pr_err("CPU#%d: Unexpected int18 (Machine Check)\n",
	       smp_processor_id());
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
20
90.91%
1
50.00%
Joe Perches
2
9.09%
1
50.00%
Total
22
100.00%
2
100.00%

/* Call the installed machine check handler for this CPU setup. */

void (*machine_check_vector)(struct pt_regs *, long error_code) =
						unexpected_machine_check;

/*
 * Called for each booted CPU to set up machine checks.
 * Must be called with preempt off:
 */


void mcheck_cpu_init(struct cpuinfo_x86 *c)
{
	if (mca_cfg.disabled)
		return;

	if (__mcheck_cpu_ancient_init(c))
		return;

	if (!mce_available(c))
		return;

	if (__mcheck_cpu_cap_init() < 0 || __mcheck_cpu_apply_quirks(c) < 0) {
		mca_cfg.disabled = true;
		return;
	}

	if (mce_gen_pool_init()) {
		mca_cfg.disabled = true;
		pr_emerg("Couldn't allocate MCE records pool!\n");
		return;
	}

	machine_check_vector = do_machine_check;

	__mcheck_cpu_init_generic();
	__mcheck_cpu_init_vendor(c);
	__mcheck_cpu_init_clear_banks();
	__mcheck_cpu_setup_timer();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
43
45.74%
6
40.00%
Chen Gong
19
20.21%
1
6.67%
Borislav Petkov
13
13.83%
2
13.33%
Ingo Molnar
6
6.38%
1
6.67%
Zwane Mwaikambo
4
4.26%
1
6.67%
Hidetoshi Seto
4
4.26%
1
6.67%
Aravind Gopalakrishnan
3
3.19%
1
6.67%
Thomas Gleixner
1
1.06%
1
6.67%
Sebastian Andrzej Siewior
1
1.06%
1
6.67%
Total
94
100.00%
15
100.00%

/*
 * Called for each booted CPU to clear some machine checks opt-ins
 */


void mcheck_cpu_clear(struct cpuinfo_x86 *c)
{
	if (mca_cfg.disabled)
		return;

	if (!mce_available(c))
		return;

	/*
         * Possibly to clear general settings generic to x86
         * __mcheck_cpu_clear_generic(c);
         */
	__mcheck_cpu_clear_vendor(c);

}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ashok Raj
26
81.25%
1
25.00%
Andi Kleen
3
9.38%
2
50.00%
Hidetoshi Seto
3
9.38%
1
25.00%
Total
32
100.00%
4
100.00%

/*
 * mce_chrdev: Character device /dev/mcelog to read and clear the MCE log.
 */

static DEFINE_SPINLOCK(mce_chrdev_state_lock);

static int mce_chrdev_open_exclu;	
/* already open exclusive? */



static int mce_chrdev_open(struct inode *inode, struct file *file)
{
	spin_lock(&mce_chrdev_state_lock);

	if (mce_chrdev_open_exclu ||
	    (mce_chrdev_open_count && (file->f_flags & O_EXCL))) {
		spin_unlock(&mce_chrdev_state_lock);

		return -EBUSY;
	}

	if (file->f_flags & O_EXCL)
		mce_chrdev_open_exclu = 1;
	mce_chrdev_open_count++;

	spin_unlock(&mce_chrdev_state_lock);

	return nonseekable_open(inode, file);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tim Hockin
71
89.87%
2
66.67%
Hidetoshi Seto
8
10.13%
1
33.33%
Total
79
100.00%
3
100.00%



static int mce_chrdev_release(struct inode *inode, struct file *file)
{
	spin_lock(&mce_chrdev_state_lock);

	mce_chrdev_open_count--;
	mce_chrdev_open_exclu = 0;

	spin_unlock(&mce_chrdev_state_lock);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tim Hockin
33
86.84%
1
50.00%
Hidetoshi Seto
5
13.16%
1
50.00%
Total
38
100.00%
2
100.00%



static void collect_tscs(void *data)
{
	unsigned long *cpu_tsc = (unsigned long *)data;

	cpu_tsc[smp_processor_id()] = rdtsc();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
27
87.10%
3
50.00%
Andrew Lutomirski
3
9.68%
2
33.33%
Dave Jones
1
3.23%
1
16.67%
Total
31
100.00%
6
100.00%


static int mce_apei_read_done;

/* Collect MCE record of previous boot in persistent storage via APEI ERST. */


static int __mce_read_apei(char __user **ubuf, size_t usize)
{
	int rc;
	u64 record_id;
	struct mce m;

	if (usize < sizeof(struct mce))
		return -EINVAL;

	rc = apei_read_mce(&m, &record_id);
	/* Error or no more MCE record */
	if (rc <= 0) {
		mce_apei_read_done = 1;
		/*
                 * When ERST is disabled, mce_chrdev_read() should return
                 * "no record" instead of "no device."
                 */
		if (rc == -ENODEV)
			return 0;
		return rc;
	}
	rc = -EFAULT;
	if (copy_to_user(*ubuf, &m, sizeof(struct mce)))
		return rc;
	/*
         * In fact, we should have cleared the record after that has
         * been flushed to the disk or sent to network in
         * /sbin/mcelog, but we have no interface to support that now,
         * so just clear it to avoid duplication.
         */
	rc = apei_clear_mce(record_id);
	if (rc) {
		mce_apei_read_done = 1;
		return rc;
	}
	*ubuf += sizeof(struct mce);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
124
91.85%
1
50.00%
Naoya Horiguchi
11
8.15%
1
50.00%
Total
135
100.00%
2
100.00%



static ssize_t mce_chrdev_read(struct file *filp, char __user *ubuf,
				size_t usize, loff_t *off)
{
	char __user *buf = ubuf;
	unsigned long *cpu_tsc;
	unsigned prev, next;
	int i, err;

	cpu_tsc = kmalloc(nr_cpu_ids * sizeof(long), GFP_KERNEL);
	if (!cpu_tsc)
		return -ENOMEM;

	mutex_lock(&mce_chrdev_read_mutex);

	if (!mce_apei_read_done) {
		err = __mce_read_apei(&buf, usize);
		if (err || buf != ubuf)
			goto out;
	}

	next = mce_log_get_idx_check(mcelog.next);

	/* Only supports full reads right now */
	err = -EINVAL;
	if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce))
		goto out;

	err = 0;
	prev = 0;
	do {
		for (i = prev; i < next; i++) {
			unsigned long start = jiffies;
			struct mce *m = &mcelog.entry[i];

			while (!m->finished) {
				if (time_after_eq(jiffies, start + 2)) {
					memset(m, 0, sizeof(*m));
					goto timeout;
				}
				cpu_relax();
			}
			smp_rmb();
			err |= copy_to_user(buf, m, sizeof(*m));
			buf += sizeof(*m);
timeout:
			;
		}

		memset(mcelog.entry + prev, 0,
		       (next - prev) * sizeof(struct mce));
		prev = next;
		next = cmpxchg(&mcelog.next, prev, 0);
	} while (next != prev);

	synchronize_sched();

	/*
         * Collect entries that were still getting written before the
         * synchronize.
         */
	on_each_cpu(collect_tscs, cpu_tsc, 1);

	for (i = next; i < MCE_LOG_LEN; i++) {
		struct mce *m = &mcelog.entry[i];

		if (m->finished && m->tsc < cpu_tsc[m->cpu]) {
			err |= copy_to_user(buf, m, sizeof(*m));
			smp_rmb();
			buf += sizeof(*m);
			memset(m, 0, sizeof(*m));
		}
	}

	if (err)
		err = -EFAULT;

out:
	mutex_unlock(&mce_chrdev_read_mutex);
	kfree(cpu_tsc);

	return err ? err : buf - ubuf;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
277
64.42%
6
31.58%
Huang Ying
84
19.53%
2
10.53%
Hidetoshi Seto
46
10.70%
2
10.53%
Ingo Molnar
7
1.63%
1
5.26%
Joshua Wise
7
1.63%
1
5.26%
Daniel Walker
2
0.47%
1
5.26%
Dipankar Sarma
2
0.47%
1
5.26%
Mike Travis
1
0.23%
1
5.26%
Al Viro
1
0.23%
1
5.26%
Borislav Petkov
1
0.23%
1
5.26%
Thomas Gleixner
1
0.23%
1
5.26%
Paul E. McKenney
1
0.23%
1
5.26%
Total
430
100.00%
19
100.00%



static unsigned int mce_chrdev_poll(struct file *file, poll_table *wait)
{
	poll_wait(file, &mce_chrdev_wait, wait);
	if (READ_ONCE(mcelog.next))
		return POLLIN | POLLRDNORM;
	if (!mce_apei_read_done && apei_check_mce())
		return POLLIN | POLLRDNORM;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tim Hockin
40
71.43%
1
25.00%
Huang Ying
13
23.21%
1
25.00%
Hidetoshi Seto
2
3.57%
1
25.00%
Paul E. McKenney
1
1.79%
1
25.00%
Total
56
100.00%
4
100.00%



static long mce_chrdev_ioctl(struct file *f, unsigned int cmd,
				unsigned long arg)
{
	int __user *p = (int __user *)arg;

	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;

	switch (cmd) {
	case MCE_GET_RECORD_LEN:
		return put_user(sizeof(struct mce), p);
	case MCE_GET_LOG_LEN:
		return put_user(MCE_LOG_LEN, p);
	case MCE_GETCLEAR_FLAGS: {
		unsigned flags;

		do {
			flags = mcelog.flags;
		} while (cmpxchg(&mcelog.flags, flags, 0) != flags);

		return put_user(flags, p);
	}
	default:
		return -ENOTTY;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
105
86.07%
4
57.14%
Al Viro
15
12.30%
1
14.29%
Nikanth Karthikesan
1
0.82%
1
14.29%
Hidetoshi Seto
1
0.82%
1
14.29%
Total
122
100.00%
7
100.00%


static ssize_t (*mce_write)(struct file *filp, const char __user *ubuf,
			    size_t usize, loff_t *off);



void register_mce_write_callback(ssize_t (*fn)(struct file *filp,
			     const char __user *ubuf,
			     size_t usize, loff_t *off))
{
	mce_write = fn;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Tony Luck
34
100.00%
1
100.00%
Total
34
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(register_mce_write_callback);



static ssize_t mce_chrdev_write(struct file *filp, const char __user *ubuf,
				size_t usize, loff_t *off)
{
	if (mce_write)
		return mce_write(filp, ubuf, usize, off);
	else
		return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tony Luck
44
97.78%
1
50.00%
Paul E. McKenney
1
2.22%
1
50.00%
Total
45
100.00%
2
100.00%


static const struct file_operations mce_chrdev_ops = {
	.open			= mce_chrdev_open,
	.release		= mce_chrdev_release,
	.read			= mce_chrdev_read,
	.write			= mce_chrdev_write,
	.poll			= mce_chrdev_poll,
	.unlocked_ioctl		= mce_chrdev_ioctl,
	.llseek			= no_llseek,
};


static struct miscdevice mce_chrdev_device = {
	MISC_MCELOG_MINOR,
	"mcelog",
	&mce_chrdev_ops,
};



static void __mce_disable_bank(void *arg)
{
	int bank = *((int *)arg);
	__clear_bit(bank, this_cpu_ptr(mce_poll_banks));
	cmci_disable_bank(bank);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Naveen N. Rao
36
97.30%
1
50.00%
Christoph Lameter
1
2.70%
1
50.00%
Total
37
100.00%
2
100.00%



void mce_disable_bank(int bank)
{
	if (bank >= mca_cfg.banks) {
		pr_warn(FW_BUG
			"Ignoring request to disable invalid MCA bank %d.\n",
			bank);
		return;
	}
	set_bit(bank, mce_banks_ce_disabled);
	on_each_cpu(__mce_disable_bank, &bank, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Naveen N. Rao
44
100.00%
1
100.00%
Total
44
100.00%
1
100.00%

/*
 * mce=off Disables machine check
 * mce=no_cmci Disables CMCI
 * mce=no_lmce Disables LMCE
 * mce=dont_log_ce Clears corrected events silently, no log created for CEs.
 * mce=ignore_ce Disables polling and CMCI, corrected events are not cleared.
 * mce=TOLERANCELEVEL[,monarchtimeout] (number, see above)
 *      monarchtimeout is how long to wait for other CPUs on machine
 *      check, or 0 to not wait
 * mce=bootlog Log MCEs from before booting. Disabled by default on AMD.
 * mce=nobootlog Don't log MCEs from before booting.
 * mce=bios_cmci_threshold Don't program the CMCI threshold
 * mce=recovery force enable memcpy_mcsafe()
 */


static int __init mcheck_enable(char *str)
{
	struct mca_config *cfg = &mca_cfg;

	if (*str == 0) {
		enable_p5_mce();
		return 1;
	}
	if (*str == '=')
		str++;
	if (!strcmp(str, "off"))
		cfg->disabled = true;
	else if (!strcmp(str, "no_cmci"))
		cfg->cmci_disabled = true;
	else if (!strcmp(str, "no_lmce"))
		cfg->lmce_disabled = true;
	else if (!strcmp(str, "dont_log_ce"))
		cfg->dont_log_ce = true;
	else if (!strcmp(str, "ignore_ce"))
		cfg->ignore_ce = true;
	else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog"))
		cfg->bootlog = (str[0] == 'b');
	else if (!strcmp(str, "bios_cmci_threshold"))
		cfg->bios_cmci_threshold = true;
	else if (!strcmp(str, "recovery"))
		cfg->recovery = true;
	else if (isdigit(str[0])) {
		if (get_option(&str, &cfg->tolerant) == 2)
			get_option(&str, &(cfg->monarch_timeout));
	} else {
		pr_info("mce argument %s ignored. Please use /sys\n", str);
		return 0;
	}
	return 1;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
111
44.22%
8
38.10%
Hidetoshi Seto
55
21.91%
2
9.52%
Borislav Petkov
38
15.14%
4
19.05%
Tony Luck
17
6.77%
1
4.76%
Naveen N. Rao
13
5.18%
1
4.76%
Ashok Raj
7
2.79%
1
4.76%
Bartlomiej Zolnierkiewicz
5
1.99%
1
4.76%
Xie XiuQi
3
1.20%
1
4.76%
Joe Perches
1
0.40%
1
4.76%
Hirofumi Ogawa
1
0.40%
1
4.76%
Total
251
100.00%
21
100.00%

__setup("mce", mcheck_enable);



int __init mcheck_init(void)
{
	mcheck_intel_therm_init();
	mce_register_decode_chain(&mce_srao_nb);
	mce_register_decode_chain(&mce_default_nb);
	mcheck_vendor_init_severity();

	INIT_WORK(&mce_work, mce_gen_pool_process);
	init_irq_work(&mce_irq_work, mce_irq_work_cb);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Gong
21
46.67%
2
28.57%
Borislav Petkov
18
40.00%
3
42.86%
Aravind Gopalakrishnan
3
6.67%
1
14.29%
Yong Wang
3
6.67%
1
14.29%
Total
45
100.00%
7
100.00%

/*
 * mce_syscore: PM support
 */

/*
 * Disable machine checks on suspend and shutdown. We can't really handle
 * them later.
 */


static void mce_disable_error_reporting(void)
{
	int i;

	for (i = 0; i < mca_cfg.banks; i++) {
		struct mce_bank *b = &mce_banks[i];

		if (b->init)
			wrmsrl(msr_ops.ctl(i), 0);
	}
	return;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
49
84.48%
4
50.00%
Yazen Ghannam
3
5.17%
1
12.50%
Ashok Raj
3
5.17%
1
12.50%
Borislav Petkov
3
5.17%
2
25.00%
Total
58
100.00%
8
100.00%



static void vendor_disable_error_reporting(void)
{
	/*
         * Don't clear on Intel CPUs. Some of these MSRs are socket-wide.
         * Disabling them for just a single offlined CPU is bad, since it will
         * inhibit reporting for all shared resources on the socket like the
         * last level cache (LLC), the integrated memory controller (iMC), etc.
         */
	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
		return;

	mce_disable_error_reporting();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ashok Raj
20
95.24%
1
50.00%
Andi Kleen
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%



static int mce_syscore_suspend(void)
{
	vendor_disable_error_reporting();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
8
57.14%
1
25.00%
Ashok Raj
4
28.57%
1
25.00%
Rafael J. Wysocki
1
7.14%
1
25.00%
Hidetoshi Seto
1
7.14%
1
25.00%
Total
14
100.00%
4
100.00%



static void mce_syscore_shutdown(void)
{
	vendor_disable_error_reporting();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
6
54.55%
1
25.00%
Rafael J. Wysocki
3
27.27%
1
25.00%
Hidetoshi Seto
1
9.09%
1
25.00%
Ashok Raj
1
9.09%
1
25.00%
Total
11
100.00%
4
100.00%

/*
 * On resume clear all MCE state. Don't want to see leftovers from the BIOS.
 * Only one CPU is active at this time, the others get re-added later using
 * CPU hotplug:
 */


static void mce_syscore_resume(void)
{
	__mcheck_cpu_init_generic();
	__mcheck_cpu_init_vendor(raw_cpu_ptr(&cpu_info));
	__mcheck_cpu_init_clear_banks();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
10
43.48%
2
22.22%
Aravind Gopalakrishnan
3
13.04%
1
11.11%
Tejun Heo
3
13.04%
1
11.11%
Borislav Petkov
2
8.70%
1
11.11%
Rafael J. Wysocki
2
8.70%
1
11.11%
Thomas Gleixner
1
4.35%
1
11.11%
Hidetoshi Seto
1
4.35%
1
11.11%
Christoph Lameter
1
4.35%
1
11.11%
Total
23
100.00%
9
100.00%


static struct syscore_ops mce_syscore_ops = {
	.suspend	= mce_syscore_suspend,
	.shutdown	= mce_syscore_shutdown,
	.resume		= mce_syscore_resume,
};

/*
 * mce_device: Sysfs support
 */



static void mce_cpu_restart(void *data)
{
	if (!mce_available(raw_cpu_ptr(&cpu_info)))
		return;
	__mcheck_cpu_init_generic();
	__mcheck_cpu_init_clear_banks();
	__mcheck_cpu_init_timer();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
20
62.50%
3
33.33%
Tejun Heo
3
9.38%
1
11.11%
Aravind Gopalakrishnan
3
9.38%
1
11.11%
Hidetoshi Seto
2
6.25%
1
11.11%
Borislav Petkov
2
6.25%
1
11.11%
Christoph Lameter
1
3.12%
1
11.11%
Thomas Gleixner
1
3.12%
1
11.11%
Total
32
100.00%
9
100.00%

/* Reinit MCEs after user configuration changes */


static void mce_restart(void)
{
	mce_timer_delete_all();
	on_each_cpu(mce_cpu_restart, NULL, 1);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
16
80.00%
3
60.00%
Hidetoshi Seto
3
15.00%
1
20.00%
Venkatesh Pallipadi
1
5.00%
1
20.00%
Total
20
100.00%
5
100.00%

/* Toggle features for corrected errors */


static void mce_disable_cmci(void *data)
{
	if (!mce_available(raw_cpu_ptr(&cpu_info)))
		return;
	cmci_clear();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidetoshi Seto
22
84.62%
2
50.00%
Tejun Heo
3
11.54%
1
25.00%
Christoph Lameter
1
3.85%
1
25.00%
Total
26
100.00%
4
100.00%



static void mce_enable_ce(void *all)
{
	if (!mce_available(raw_cpu_ptr(&cpu_info)))
		return;
	cmci_reenable();
	cmci_recheck();
	if (all)
		__mcheck_cpu_init_timer();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidetoshi Seto
31
86.11%
1
25.00%
Tejun Heo
3
8.33%
1
25.00%
Christoph Lameter
1
2.78%
1
25.00%
Borislav Petkov
1
2.78%
1
25.00%
Total
36
100.00%
4
100.00%


static struct bus_type mce_subsys = {
	.name		= "machinecheck",
	.dev_name	= "machinecheck",
};

DEFINE_PER_CPU(struct device *, mce_device);



static inline struct mce_bank *attr_to_bank(struct device_attribute *attr)
{
	return container_of(attr, struct mce_bank, attr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
23
92.00%
3
60.00%
David Shaohua Li
1
4.00%
1
20.00%
Kay Sievers
1
4.00%
1
20.00%
Total
25
100.00%
5
100.00%



static ssize_t show_bank(struct device *s, struct device_attribute *attr,
			 char *buf)
{
	return sprintf(buf, "%llx\n", attr_to_bank(attr)->ctl);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
30
85.71%
4
57.14%
Kay Sievers
2
5.71%
1
14.29%
David Shaohua Li
2
5.71%
1
14.29%
H. Peter Anvin
1
2.86%
1
14.29%
Total
35
100.00%
7
100.00%



static ssize_t set_bank(struct device *s, struct device_attribute *attr,
			const char *buf, size_t size)
{
	u64 new;

	if (kstrtou64(buf, 0, &new) < 0)
		return -EINVAL;

	attr_to_bank(attr)->ctl = new;
	mce_restart();

	return size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
47
78.33%
2
40.00%
Hidetoshi Seto
10
16.67%
1
20.00%
Kay Sievers
2
3.33%
1
20.00%
Daniel Walter
1
1.67%
1
20.00%
Total
60
100.00%
5
100.00%


static ssize_t

show_trigger(struct device *s, struct device_attribute *attr, char *buf)
{
	strcpy(buf, mce_helper);
	strcat(buf, "\n");
	return strlen(mce_helper) + 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
38
90.48%
2
50.00%
Kay Sievers
2
4.76%
1
25.00%
Hidetoshi Seto
2
4.76%
1
25.00%
Total
42
100.00%
4
100.00%



static ssize_t set_trigger(struct device *s, struct device_attribute *attr,
				const char *buf, size_t siz)
{
	char *p;

	strncpy(mce_helper, buf, sizeof(mce_helper));
	mce_helper[sizeof(mce_helper)-1] = 0;
	p = strchr(mce_helper, '\n');

	if (p)
		*p = 0;

	return strlen(mce_helper) + !!p;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
62
77.50%
2
33.33%
Jan Beulich
8
10.00%
1
16.67%
Hidetoshi Seto
5
6.25%
1
16.67%
David Shaohua Li
3
3.75%
1
16.67%
Kay Sievers
2
2.50%
1
16.67%
Total
80
100.00%
6
100.00%



static ssize_t set_ignore_ce(struct device *s,
			     struct device_attribute *attr,
			     const char *buf, size_t size)
{
	u64 new;

	if (kstrtou64(buf, 0, &new) < 0)
		return -EINVAL;

	if (mca_cfg.ignore_ce ^ !!new) {
		if (new) {
			/* disable ce features */
			mce_timer_delete_all();
			on_each_cpu(mce_disable_cmci, NULL, 1);
			mca_cfg.ignore_ce = true;
		} else {
			/* enable ce features */
			mca_cfg.ignore_ce = false;
			on_each_cpu(mce_enable_ce, (void *)1, 1);
		}
	}
	return size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidetoshi Seto
94
87.04%
2
40.00%
Borislav Petkov
11
10.19%
1
20.00%
Kay Sievers
2
1.85%
1
20.00%
Daniel Walter
1
0.93%
1
20.00%
Total
108
100.00%
5
100.00%



static ssize_t set_cmci_disabled(struct device *s,
				 struct device_attribute *attr,
				 const char *buf, size_t size)
{
	u64 new;

	if (kstrtou64(buf, 0, &new) < 0)
		return -EINVAL;

	if (mca_cfg.cmci_disabled ^ !!new) {
		if (new) {
			/* disable cmci */
			on_each_cpu(mce_disable_cmci, NULL, 1);
			mca_cfg.cmci_disabled = true;
		} else {
			/* enable cmci */
			mca_cfg.cmci_disabled = false;
			on_each_cpu(mce_enable_ce, NULL, 1);
		}
	}
	return size;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Hidetoshi Seto
87
86.14%
2
40.00%
Borislav Petkov
11
10.89%
1
20.00%
Kay Sievers
2
1.98%
1
20.00%
Daniel Walter
1
0.99%
1
20.00%
Total
101
100.00%
5
100.00%



static ssize_t store_int_with_restart(struct device *s,
				      struct device_attribute *attr,
				      const char *buf, size_t size)
{
	ssize_t ret = device_store_int(s, attr, buf, size);
	mce_restart();
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
41
93.18%
1
50.00%
Kay Sievers
3
6.82%
1
50.00%
Total
44
100.00%
2
100.00%

static DEVICE_ATTR(trigger, 0644, show_trigger, set_trigger);
static DEVICE_INT_ATTR(tolerant, 0644, mca_cfg.tolerant);
static DEVICE_INT_ATTR(monarch_timeout, 0644, mca_cfg.monarch_timeout);
static DEVICE_BOOL_ATTR(dont_log_ce, 0644, mca_cfg.dont_log_ce);


static struct dev_ext_attribute dev_attr_check_interval = {
	__ATTR(check_interval, 0644, device_show_int, store_int_with_restart),
	&check_interval
};


static struct dev_ext_attribute dev_attr_ignore_ce = {
	__ATTR(ignore_ce, 0644, device_show_bool, set_ignore_ce),
	&mca_cfg.ignore_ce
};


static struct dev_ext_attribute dev_attr_cmci_disabled = {
	__ATTR(cmci_disabled, 0644, device_show_bool, set_cmci_disabled),
	&mca_cfg.cmci_disabled
};


static struct device_attribute *mce_device_attrs[] = {
	&dev_attr_tolerant.attr,
	&dev_attr_check_interval.attr,
	&dev_attr_trigger,
	&dev_attr_monarch_timeout.attr,
	&dev_attr_dont_log_ce.attr,
	&dev_attr_ignore_ce.attr,
	&dev_attr_cmci_disabled.attr,
	NULL
};


static cpumask_var_t mce_device_initialized;



static void mce_device_release(struct device *dev)
{
	kfree(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Greg Kroah-Hartman
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

/* Per cpu device init. All of the cpus still share the same ctrl bank: */


static int mce_device_create(unsigned int cpu)
{
	struct device *dev;
	int err;
	int i, j;

	if (!mce_available(&boot_cpu_data))
		return -EIO;

	dev = per_cpu(mce_device, cpu);
	if (dev)
		return 0;

	dev = kzalloc(sizeof *dev, GFP_KERNEL);
	if (!dev)
		return -ENOMEM;
	dev->id  = cpu;
	dev->bus = &mce_subsys;
	dev->release = &mce_device_release;

	err = device_register(dev);
	if (err) {
		put_device(dev);
		return err;
	}

	for (i = 0; mce_device_attrs[i]; i++) {
		err = device_create_file(dev, mce_device_attrs[i]);
		if (err)
			goto error;
	}
	for (j = 0; j < mca_cfg.banks; j++) {
		err = device_create_file(dev, &mce_banks[j].attr);
		if (err)
			goto error2;
	}
	cpumask_set_cpu(cpu, mce_device_initialized);
	per_cpu(mce_device, cpu) = dev;

	return 0;
error2:
	while (--j >= 0)
		device_remove_file(dev, &mce_banks[j].attr);
error:
	while (--i >= 0)
		device_remove_file(dev, mce_device_attrs[i]);

	device_unregister(dev);

	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
102
40.00%
7
35.00%
Akinobu Mita
36
14.12%
1
5.00%
Greg Kroah-Hartman
31
12.16%
2
10.00%
Kay Sievers
24
9.41%
1
5.00%
David Shaohua Li
17
6.67%
1
5.00%
Sebastian Andrzej Siewior
16
6.27%
1
5.00%
Hidetoshi Seto
13
5.10%
2
10.00%
Levente Kurusa
7
2.75%
1
5.00%
Andreas Herrmann
6
2.35%
2
10.00%
Borislav Petkov
2
0.78%
1
5.00%
Rusty Russell
1
0.39%
1
5.00%
Total
255
100.00%
20
100.00%



static void mce_device_remove(unsigned int cpu)
{
	struct device *dev = per_cpu(mce_device, cpu);
	int i;

	if (!cpumask_test_cpu(cpu, mce_device_initialized))
		return;

	for (i = 0; mce_device_attrs[i]; i++)
		device_remove_file(dev, mce_device_attrs[i]);

	for (i = 0; i < mca_cfg.banks; i++)
		device_remove_file(dev, &mce_banks[i].attr);

	device_unregister(dev);
	cpumask_clear_cpu(cpu, mce_device_initialized);
	per_cpu(mce_device, cpu) = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
42
38.53%
4
33.33%
David Shaohua Li
17
15.60%
1
8.33%
Kay Sievers
14
12.84%
1
8.33%
Andreas Herrmann
14
12.84%
1
8.33%
Greg Kroah-Hartman
13
11.93%
2
16.67%
Hidetoshi Seto
5
4.59%
1
8.33%
Rusty Russell
2
1.83%
1
8.33%
Borislav Petkov
2
1.83%
1
8.33%
Total
109
100.00%
12
100.00%

/* Make sure there are no machine checks on offlined CPUs. */


static void mce_disable_cpu(void)
{
	if (!mce_available(raw_cpu_ptr(&cpu_info)))
		return;

	if (!cpuhp_tasks_frozen)
		cmci_clear();

	vendor_disable_error_reporting();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
25
78.12%
2
33.33%
Tejun Heo
3
9.38%
1
16.67%
Ashok Raj
2
6.25%
1
16.67%
Sebastian Andrzej Siewior
1
3.12%
1
16.67%
Christoph Lameter
1
3.12%
1
16.67%
Total
32
100.00%
6
100.00%



static void mce_reenable_cpu(void)
{
	int i;

	if (!mce_available(raw_cpu_ptr(&cpu_info)))
		return;

	if (!cpuhp_tasks_frozen)
		cmci_reenable();
	for (i = 0; i < mca_cfg.banks; i++) {
		struct mce_bank *b = &mce_banks[i];

		if (b->init)
			wrmsrl(msr_ops.ctl(i), b->ctl);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
67
83.75%
5
45.45%
Tejun Heo
3
3.75%
1
9.09%
Ingo Molnar
3
3.75%
1
9.09%
Yazen Ghannam
3
3.75%
1
9.09%
Borislav Petkov
2
2.50%
1
9.09%
Christoph Lameter
1
1.25%
1
9.09%
Sebastian Andrzej Siewior
1
1.25%
1
9.09%
Total
80
100.00%
11
100.00%



static int mce_cpu_dead(unsigned int cpu)
{
	mce_intel_hcpu_update(cpu);

	/* intentionally ignoring frozen here */
	if (!cpuhp_tasks_frozen)
		cmci_rediscover();
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
19
70.37%
2
66.67%
Andi Kleen
8
29.63%
1
33.33%
Total
27
100.00%
3
100.00%



static int mce_cpu_online(unsigned int cpu)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);
	int ret;

	mce_device_create(cpu);

	ret = mce_threshold_create_device(cpu);
	if (ret) {
		mce_device_remove(cpu);
		return ret;
	}
	mce_reenable_cpu();
	mce_start_timer(t);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
25
40.98%
3
30.00%
Andi Kleen
23
37.70%
3
30.00%
Rafael J. Wysocki
7
11.48%
1
10.00%
Borislav Petkov
2
3.28%
1
10.00%
Kay Sievers
2
3.28%
1
10.00%
Thomas Gleixner
2
3.28%
1
10.00%
Total
61
100.00%
10
100.00%



static int mce_cpu_pre_down(unsigned int cpu)
{
	struct timer_list *t = this_cpu_ptr(&mce_timer);

	mce_disable_cpu();
	del_timer_sync(t);
	mce_threshold_remove_device(cpu);
	mce_device_remove(cpu);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sebastian Andrzej Siewior
20
47.62%
2
28.57%
Andi Kleen
10
23.81%
2
28.57%
Thomas Gleixner
6
14.29%
2
28.57%
Chen Gong
6
14.29%
1
14.29%
Total
42
100.00%
7
100.00%



static __init void mce_init_banks(void)
{
	int i;

	for (i = 0; i < mca_cfg.banks; i++) {
		struct mce_bank *b = &mce_banks[i];
		struct device_attribute *a = &b->attr;

		sysfs_attr_init(&a->attr);
		a->attr.name	= b->attrname;
		snprintf(b->attrname, ATTR_LEN, "bank%d", i);

		a->attr.mode	= 0644;
		a->show		= show_bank;
		a->store	= set_bank;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
90
89.11%
2
40.00%
Eric W. Biedermann
8
7.92%
1
20.00%
Borislav Petkov
2
1.98%
1
20.00%
Kay Sievers
1
0.99%
1
20.00%
Total
101
100.00%
5
100.00%



static __init int mcheck_init_device(void)
{
	enum cpuhp_state hp_online;
	int err;

	if (!mce_available(&boot_cpu_data)) {
		err = -EIO;
		goto err_out;
	}

	if (!zalloc_cpumask_var(&mce_device_initialized, GFP_KERNEL)) {
		err = -ENOMEM;
		goto err_out;
	}

	mce_init_banks();

	err = subsys_system_register(&mce_subsys, NULL);
	if (err)
		goto err_out_mem;

	err = cpuhp_setup_state(CPUHP_X86_MCE_DEAD, "x86/mce:dead", NULL,
				mce_cpu_dead);
	if (err)
		goto err_out_mem;

	err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "x86/mce:online",
				mce_cpu_online, mce_cpu_pre_down);
	if (err < 0)
		goto err_out_online;
	hp_online = err;

	register_syscore_ops(&mce_syscore_ops);

	/* register character device /dev/mcelog */
	err = misc_register(&mce_chrdev_device);
	if (err)
		goto err_register;

	return 0;

err_register:
	unregister_syscore_ops(&mce_syscore_ops);
	cpuhp_remove_state(hp_online);

err_out_online:
	cpuhp_remove_state(CPUHP_X86_MCE_DEAD);

err_out_mem:
	free_cpumask_var(mce_device_initialized);

err_out:
	pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err);

	return err;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mathieu Souchaud
76
40.86%
1
7.69%
Andi Kleen
40
21.51%
4
30.77%
Sebastian Andrzej Siewior
37
19.89%
2
15.38%
Akinobu Mita
14
7.53%
1
7.69%
Rusty Russell
6
3.23%
1
7.69%
Rafael J. Wysocki
6
3.23%
1
7.69%
Kay Sievers
5
2.69%
1
7.69%
Yinghai Lu
1
0.54%
1
7.69%
Borislav Petkov
1
0.54%
1
7.69%
Total
186
100.00%
13
100.00%


device_initcall_sync(mcheck_init_device);

/*
 * Old style boot options parsing. Only for compatibility.
 */


static int __init mcheck_disable(char *str)
{
	mca_cfg.disabled = true;
	return 1;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ingo Molnar
15
75.00%
1
33.33%
Borislav Petkov
4
20.00%
1
33.33%
Andi Kleen
1
5.00%
1
33.33%
Total
20
100.00%
3
100.00%

__setup("nomce", mcheck_disable);

#ifdef CONFIG_DEBUG_FS


struct dentry *mce_get_debugfs_dir(void)
{
	static struct dentry *dmce;

	if (!dmce)
		dmce = debugfs_create_dir("mce", NULL);

	return dmce;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
22
68.75%
1
50.00%
Ingo Molnar
10
31.25%
1
50.00%
Total
32
100.00%
2
100.00%



static void mce_reset(void)
{
	cpu_missing = 0;
	atomic_set(&mce_fake_panicked, 0);
	atomic_set(&mce_executing, 0);
	atomic_set(&mce_callin, 0);
	atomic_set(&global_nwo, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
28
63.64%
1
25.00%
Ingo Molnar
15
34.09%
2
50.00%
Borislav Petkov
1
2.27%
1
25.00%
Total
44
100.00%
4
100.00%



static int fake_panic_get(void *data, u64 *val)
{
	*val = fake_panic;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
13
59.09%
1
50.00%
Ingo Molnar
9
40.91%
1
50.00%
Total
22
100.00%
2
100.00%



static int fake_panic_set(void *data, u64 val)
{
	mce_reset();
	fake_panic = val;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
21
91.30%
1
50.00%
Ingo Molnar
2
8.70%
1
50.00%
Total
23
100.00%
2
100.00%

DEFINE_SIMPLE_ATTRIBUTE(fake_panic_fops, fake_panic_get,
			fake_panic_set, "%llu\n");



static int __init mcheck_debugfs_init(void)
{
	struct dentry *dmce, *ffake_panic;

	dmce = mce_get_debugfs_dir();
	if (!dmce)
		return -ENOMEM;
	ffake_panic = debugfs_create_file("fake_panic", 0444, dmce, NULL,
					  &fake_panic_fops);
	if (!ffake_panic)
		return -ENOMEM;

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Huang Ying
47
79.66%
1
33.33%
Ingo Molnar
11
18.64%
1
33.33%
Borislav Petkov
1
1.69%
1
33.33%
Total
59
100.00%
3
100.00%

#else


static int __init mcheck_debugfs_init(void) { return -EINVAL; }
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Gong
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%

#endif


DEFINE_STATIC_KEY_FALSE(mcsafe_key);

EXPORT_SYMBOL_GPL(mcsafe_key);



static int __init mcheck_late_init(void)
{
	if (mca_cfg.recovery)
		static_branch_inc(&mcsafe_key);

	mcheck_debugfs_init();

	/*
         * Flush out everything that has been logged during early boot, now that
         * everything has been initialized (workqueues, decoders, ...).
         */
	mce_schedule_work();

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Chen Gong
19
61.29%
1
50.00%
Tony Luck
12
38.71%
1
50.00%
Total
31
100.00%
2
100.00%


late_initcall(mcheck_late_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
4351
44.09%
73
26.35%
Borislav Petkov
911
9.23%
32
11.55%
Tony Luck
767
7.77%
13
4.69%
Hidetoshi Seto
698
7.07%
23
8.30%
Huang Ying
480
4.86%
6
2.17%
Yazen Ghannam
372
3.77%
8
2.89%
Chen Gong
310
3.14%
7
2.53%
Tim Hockin
254
2.57%
4
1.44%
Ingo Molnar
193
1.96%
7
2.53%
Ashok Raj
175
1.77%
5
1.81%
Sebastian Andrzej Siewior
155
1.57%
5
1.81%
Chen Yucong
137
1.39%
2
0.72%
Thomas Gleixner
101
1.02%
8
2.89%
Kay Sievers
99
1.00%
2
0.72%
Naveen N. Rao
98
0.99%
3
1.08%
Aravind Gopalakrishnan
84
0.85%
7
2.53%
Mathieu Souchaud
76
0.77%
1
0.36%
Greg Kroah-Hartman
67
0.68%
2
0.72%
Akinobu Mita
56
0.57%
2
0.72%
Zwane Mwaikambo
51
0.52%
2
0.72%
David Shaohua Li
45
0.46%
1
0.36%
Rafael J. Wysocki
41
0.42%
2
0.72%
Andrew Lutomirski
35
0.35%
5
1.81%
Tejun Heo
31
0.31%
4
1.44%
Christoph Lameter
24
0.24%
1
0.36%
Bartlomiej Zolnierkiewicz
24
0.24%
2
0.72%
Andreas Herrmann
22
0.22%
2
0.72%
Jan Beulich
22
0.22%
2
0.72%
Andrew Morton
18
0.18%
2
0.72%
Al Viro
16
0.16%
1
0.36%
Joe Perches
16
0.16%
1
0.36%
Rusty Russell
12
0.12%
2
0.72%
Naoya Horiguchi
11
0.11%
1
0.36%
Venkatesh Pallipadi
10
0.10%
2
0.72%
Paul E. McKenney
9
0.09%
4
1.44%
Eric W. Biedermann
8
0.08%
1
0.36%
Levente Kurusa
7
0.07%
1
0.36%
Arnd Bergmann
7
0.07%
2
0.72%
Joshua Wise
7
0.07%
1
0.36%
H. Peter Anvin
7
0.07%
2
0.72%
Jeremy Fitzhardinge
5
0.05%
1
0.36%
Roland Dreier
5
0.05%
1
0.36%
Mike Waychison
4
0.04%
1
0.36%
Jacob Shin
4
0.04%
1
0.36%
Dipankar Sarma
4
0.04%
1
0.36%
Yong Wang
3
0.03%
1
0.36%
Xie XiuQi
3
0.03%
1
0.36%
Daniel Rahn
3
0.03%
1
0.36%
Vishal Verma
3
0.03%
1
0.36%
Daniel Walter
3
0.03%
1
0.36%
Paul Gortmaker
3
0.03%
1
0.36%
Randy Dunlap
2
0.02%
1
0.36%
Jesse Larrew
2
0.02%
1
0.36%
Alex Shi
2
0.02%
1
0.36%
Yinghai Lu
2
0.02%
2
0.72%
Derek Che
2
0.02%
1
0.36%
Daniel Walker
2
0.02%
1
0.36%
Nikanth Karthikesan
2
0.02%
1
0.36%
Dave Jones
1
0.01%
1
0.36%
Adrian Bunk
1
0.01%
1
0.36%
Davidlohr Bueso A
1
0.01%
1
0.36%
Hirofumi Ogawa
1
0.01%
1
0.36%
Liu Jinsong
1
0.01%
1
0.36%
Mike Travis
1
0.01%
1
0.36%
Linus Torvalds
1
0.01%
1
0.36%
Total
9868
100.00%
277
100.00%
Directory: arch/x86/kernel/cpu/mcheck

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