/*
* 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
*/
-
-#include <linux/init.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
+#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/smp_lock.h>
+#include <linux/kobject.h>
+#include <linux/kdebug.h>
+#include <linux/kernel.h>
+#include <linux/percpu.h>
#include <linux/string.h>
-#include <linux/rcupdate.h>
-#include <linux/kallsyms.h>
#include <linux/sysdev.h>
-#include <linux/miscdevice.h>
-#include <linux/fs.h>
-#include <linux/capability.h>
-#include <linux/cpu.h>
-#include <linux/percpu.h>
-#include <linux/poll.h>
-#include <linux/thread_info.h>
#include <linux/ctype.h>
-#include <linux/kmod.h>
-#include <linux/kdebug.h>
-#include <linux/kobject.h>
+#include <linux/sched.h>
#include <linux/sysfs.h>
-#include <linux/ratelimit.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <linux/poll.h>
+#include <linux/cpu.h>
+#include <linux/fs.h>
+
#include <asm/processor.h>
-#include <asm/msr.h>
-#include <asm/mce.h>
#include <asm/uaccess.h>
-#include <asm/smp.h>
#include <asm/idle.h>
+#include <asm/mce.h>
+#include <asm/msr.h>
+#include <asm/smp.h>
-#define MISC_MCELOG_MINOR 227
+#define MISC_MCELOG_MINOR 227
atomic_t mce_entry;
-static int mce_dont_init;
+static int mce_dont_init;
/*
* Tolerant levels:
* 2: SIGBUS or log uncorrected errors (if possible), log corrected errors
* 3: never panic or SIGBUS, log all errors (for testing only)
*/
-static int tolerant = 1;
-static int banks;
-static u64 *bank;
-static unsigned long notify_user;
-static int rip_msr;
-static int mce_bootlog = -1;
-static atomic_t mce_events;
+static int tolerant = 1;
+static int banks;
+static u64 *bank;
+static unsigned long notify_user;
+static int rip_msr;
+static int mce_bootlog = -1;
+static atomic_t mce_events;
-static char trigger[128];
-static char *trigger_argv[2] = { trigger, NULL };
+static char trigger[128];
+static char *trigger_argv[2] = { trigger, NULL };
static DECLARE_WAIT_QUEUE_HEAD(mce_wait);
void mce_log(struct mce *mce)
{
unsigned next, entry;
+
atomic_inc(&mce_events);
mce->finished = 0;
wmb();
for (;;) {
entry = rcu_dereference(mcelog.next);
for (;;) {
- /* When the buffer fills up discard new entries. Assume
- that the earlier errors are the more interesting. */
+ /*
+ * 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. */
+ /* Old left over entry. Skip: */
if (mcelog.entry[entry].finished) {
entry++;
continue;
* implies that most kernel services cannot be safely used. Don't even
* think about putting a printk in there!
*/
-void do_machine_check(struct pt_regs * regs, long error_code)
+void do_machine_check(struct pt_regs *regs, long error_code)
{
struct mce m, panicm;
+ int panicm_found = 0;
u64 mcestart = 0;
int i;
- int panicm_found = 0;
/*
* If no_way_out gets set, there is no safe way to recover from this
* MCE. If tolerant is cranked up, we'll try anyway.
mce_setup(&m);
rdmsrl(MSR_IA32_MCG_STATUS, m.mcgstatus);
+
/* if the restart IP is not valid, we're done for */
if (!(m.mcgstatus & MCG_STATUS_RIPV))
no_way_out = 1;
mce_get_rip(&m, regs);
mce_log(&m);
- /* Did this bank cause the exception? */
- /* Assume that the bank with uncorrectable errors did it,
- and that there is only a single one. */
- if ((m.status & MCI_STATUS_UC) && (m.status & MCI_STATUS_EN)) {
+ /*
+ * Did this bank cause the exception?
+ *
+ * Assume that the bank with uncorrectable errors did it,
+ * and that there is only a single one:
+ */
+ if ((m.status & MCI_STATUS_UC) &&
+ (m.status & MCI_STATUS_EN)) {
panicm = m;
panicm_found = 1;
}
}
- /* If we didn't find an uncorrectable error, pick
- the last one (shouldn't happen, just being safe). */
+ /*
+ * If we didn't find an uncorrectable error, pick
+ * the last one (shouldn't happen, just being safe).
+ */
if (!panicm_found)
panicm = m;
/*
* If we have decided that we just CAN'T continue, and the user
- * has not set tolerant to an insane level, give up and die.
+ * has not set tolerant to an insane level, give up and die.
*/
if (no_way_out && tolerant < 3)
mce_panic("Machine check", &panicm, mcestart);
* poller finds an MCE, poll 2x faster. When the poller finds no more
* errors, poll 2x slower (up to check_interval seconds).
*/
-
static int check_interval = 5 * 60; /* 5 minutes */
+
static DEFINE_PER_CPU(int, next_interval); /* in jiffies */
-static void mcheck_timer(unsigned long);
static DEFINE_PER_CPU(struct timer_list, mce_timer);
static void mcheck_timer(unsigned long data)
WARN_ON(smp_processor_id() != data);
- if (mce_available(¤t_cpu_data))
+ if (mce_available(¤t_cpu_data)) {
machine_check_poll(MCP_TIMESTAMP,
&__get_cpu_var(mce_poll_banks));
+ }
/*
* Alert userspace if needed. If we logged an MCE, reduce the
static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
clear_thread_flag(TIF_MCE_NOTIFY);
+
if (test_and_clear_bit(0, ¬ify_user)) {
wake_up_interruptible(&mce_wait);
return 0;
}
-/* see if the idle task needs to notify userspace */
+/* see if the idle task needs to notify userspace: */
static int
-mce_idle_callback(struct notifier_block *nfb, unsigned long action, void *junk)
+mce_idle_callback(struct notifier_block *nfb, unsigned long action,
+ void *unused)
{
/* IDLE_END should be safe - interrupts are back on */
if (action == IDLE_END && test_thread_flag(TIF_MCE_NOTIFY))
}
static struct notifier_block mce_idle_notifier = {
- .notifier_call = mce_idle_callback,
+ .notifier_call = mce_idle_callback,
};
static __init int periodic_mcheck_init(void)
*/
static int mce_cap_init(void)
{
- u64 cap;
unsigned b;
+ u64 cap;
rdmsrl(MSR_IA32_MCG_CAP, cap);
b = cap & 0xff;
static void mce_init(void *dummy)
{
+ mce_banks_t all_banks;
u64 cap;
int i;
- mce_banks_t all_banks;
/*
* Log the machine checks left over from the previous reset.
{
/* This should be disabled by the BIOS, but isn't always */
if (c->x86_vendor == X86_VENDOR_AMD) {
- if (c->x86 == 15 && banks > 4)
- /* disable GART TBL walk error reporting, which trips off
- incorrectly with the IOMMU & 3ware & Cerberus. */
+ if (c->x86 == 15 && banks > 4) {
+ /*
+ * disable GART TBL walk error reporting, which
+ * trips off incorrectly with the IOMMU & 3ware
+ * & Cerberus:
+ */
clear_bit(10, (unsigned long *)&bank[4]);
- if(c->x86 <= 17 && mce_bootlog < 0)
- /* Lots of broken BIOS around that don't clear them
- by default and leave crap in there. Don't log. */
+ }
+ if (c->x86 <= 17 && mce_bootlog < 0) {
+ /*
+ * Lots of broken BIOS around that don't clear them
+ * by default and leave crap in there. Don't log:
+ */
mce_bootlog = 0;
+ }
}
}
/*
* Called for each booted CPU to set up machine checks.
- * Must be called with preempt off.
+ * Must be called with preempt off:
*/
void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
{
*/
static DEFINE_SPINLOCK(mce_state_lock);
-static int open_count; /* #times opened */
-static int open_exclu; /* already open exclusive? */
+static int open_count; /* #times opened */
+static int open_exclu; /* already open exclusive? */
static int mce_open(struct inode *inode, struct file *file)
{
if (open_exclu || (open_count && (file->f_flags & O_EXCL))) {
spin_unlock(&mce_state_lock);
unlock_kernel();
+
return -EBUSY;
}
rdtscll(cpu_tsc[smp_processor_id()]);
}
+static DEFINE_MUTEX(mce_read_mutex);
+
static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
loff_t *off)
{
+ char __user *buf = ubuf;
unsigned long *cpu_tsc;
- static DEFINE_MUTEX(mce_read_mutex);
unsigned prev, next;
- char __user *buf = ubuf;
int i, err;
cpu_tsc = kmalloc(nr_cpu_ids * sizeof(long), GFP_KERNEL);
if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
mutex_unlock(&mce_read_mutex);
kfree(cpu_tsc);
+
return -EINVAL;
}
* synchronize.
*/
on_each_cpu(collect_tscs, cpu_tsc, 1);
+
for (i = next; i < MCE_LOG_LEN; i++) {
if (mcelog.entry[i].finished &&
mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) {
}
mutex_unlock(&mce_read_mutex);
kfree(cpu_tsc);
+
return err ? -EFAULT : buf - ubuf;
}
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
+
switch (cmd) {
case MCE_GET_RECORD_LEN:
return put_user(sizeof(struct mce), p);
do {
flags = mcelog.flags;
} while (cmpxchg(&mcelog.flags, flags, 0) != flags);
+
return put_user(flags, p);
}
default:
}
static const struct file_operations mce_chrdev_ops = {
- .open = mce_open,
- .release = mce_release,
- .read = mce_read,
- .poll = mce_poll,
- .unlocked_ioctl = mce_ioctl,
+ .open = mce_open,
+ .release = mce_release,
+ .read = mce_read,
+ .poll = mce_poll,
+ .unlocked_ioctl = mce_ioctl,
};
static struct miscdevice mce_log_device = {
return mce_disable();
}
-/* 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 readded later using
- CPU hotplug. */
+/*
+ * 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 int mce_resume(struct sys_device *dev)
{
mce_init(NULL);
mce_cpu_features(¤t_cpu_data);
+
return 0;
}
}
static struct sysdev_class mce_sysclass = {
- .suspend = mce_suspend,
- .shutdown = mce_shutdown,
- .resume = mce_resume,
- .name = "machinecheck",
+ .suspend = mce_suspend,
+ .shutdown = mce_shutdown,
+ .resume = mce_resume,
+ .name = "machinecheck",
};
DEFINE_PER_CPU(struct sys_device, device_mce);
-void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu) __cpuinitdata;
+
+__cpuinitdata
+void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu);
/* Why are there no generic functions for this? */
#define ACCESSOR(name, var, start) \
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);
char *buf)
{
u64 b = bank[attr - bank_attrs];
+
return sprintf(buf, "%llx\n", b);
}
{
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");
}
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
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;
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;
}
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;
}
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);
}
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++)
}
/* 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);
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;
kfree(bank_attrs[i].attr.name);
kfree(bank_attrs);
bank_attrs = NULL;
+
return -ENOMEM;
}
register_hotcpu_notifier(&mce_cpu_notifier);
misc_register(&mce_log_device);
+
return err;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff