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-rw-r--r--arch/x86/kernel/cpu/mcheck/mce_64.c164
1 files changed, 86 insertions, 78 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce_64.c b/arch/x86/kernel/cpu/mcheck/mce_64.c
index 07bbfe7aa7f7..b9f802e35209 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_64.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_64.c
@@ -1,8 +1,8 @@
/*
* Machine check handler.
* K8 parts Copyright 2002,2003 Andi Kleen, SuSE Labs.
- * Rest from unknown author(s).
- * 2004 Andi Kleen. Rewrote most of it.
+ * Rest from unknown author(s).
+ * 2004 Andi Kleen. Rewrote most of it.
*/
#include <linux/init.h>
@@ -23,7 +23,7 @@
#include <linux/ctype.h>
#include <linux/kmod.h>
#include <linux/kdebug.h>
-#include <asm/processor.h>
+#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/mce.h>
#include <asm/uaccess.h>
@@ -63,10 +63,10 @@ static DECLARE_WAIT_QUEUE_HEAD(mce_wait);
* separate MCEs from kernel messages to avoid bogus bug reports.
*/
-struct mce_log mcelog = {
+struct mce_log mcelog = {
MCE_LOG_SIGNATURE,
MCE_LOG_LEN,
-};
+};
void mce_log(struct mce *mce)
{
@@ -111,42 +111,42 @@ static void print_mce(struct mce *m)
"CPU %d: Machine Check Exception: %16Lx Bank %d: %016Lx\n",
m->cpu, m->mcgstatus, m->bank, m->status);
if (m->rip) {
- printk(KERN_EMERG
- "RIP%s %02x:<%016Lx> ",
+ printk(KERN_EMERG "RIP%s %02x:<%016Lx> ",
!(m->mcgstatus & MCG_STATUS_EIPV) ? " !INEXACT!" : "",
m->cs, m->rip);
if (m->cs == __KERNEL_CS)
print_symbol("{%s}", m->rip);
printk("\n");
}
- printk(KERN_EMERG "TSC %Lx ", m->tsc);
+ printk(KERN_EMERG "TSC %Lx ", m->tsc);
if (m->addr)
printk("ADDR %Lx ", m->addr);
if (m->misc)
- printk("MISC %Lx ", m->misc);
+ printk("MISC %Lx ", m->misc);
printk("\n");
printk(KERN_EMERG "This is not a software problem!\n");
- printk(KERN_EMERG
- "Run through mcelog --ascii to decode and contact your hardware vendor\n");
+ printk(KERN_EMERG "Run through mcelog --ascii to decode "
+ "and contact your hardware vendor\n");
}
static void mce_panic(char *msg, struct mce *backup, unsigned long start)
-{
+{
int i;
oops_begin();
for (i = 0; i < MCE_LOG_LEN; i++) {
unsigned long tsc = mcelog.entry[i].tsc;
+
if (time_before(tsc, start))
continue;
- print_mce(&mcelog.entry[i]);
+ print_mce(&mcelog.entry[i]);
if (backup && mcelog.entry[i].tsc == backup->tsc)
backup = NULL;
}
if (backup)
print_mce(backup);
panic(msg);
-}
+}
static int mce_available(struct cpuinfo_x86 *c)
{
@@ -170,10 +170,9 @@ static inline void mce_get_rip(struct mce *m, struct pt_regs *regs)
}
}
-/*
+/*
* The actual machine check handler
*/
-
void do_machine_check(struct pt_regs * regs, long error_code)
{
struct mce m, panicm;
@@ -194,7 +193,8 @@ void do_machine_check(struct pt_regs * regs, long error_code)
atomic_inc(&mce_entry);
if (regs)
- notify_die(DIE_NMI, "machine check", regs, error_code, 18, SIGKILL);
+ notify_die(DIE_NMI, "machine check", regs, error_code, 18,
+ SIGKILL);
if (!banks)
goto out2;
@@ -204,15 +204,15 @@ void do_machine_check(struct pt_regs * regs, long error_code)
/* if the restart IP is not valid, we're done for */
if (!(m.mcgstatus & MCG_STATUS_RIPV))
no_way_out = 1;
-
+
rdtscll(mcestart);
barrier();
for (i = 0; i < banks; i++) {
if (!bank[i])
continue;
-
- m.misc = 0;
+
+ m.misc = 0;
m.addr = 0;
m.bank = i;
m.tsc = 0;
@@ -372,7 +372,7 @@ static void mcheck_timer(struct work_struct *work)
if (mce_notify_user()) {
next_interval = max(next_interval/2, HZ/100);
} else {
- next_interval = min(next_interval*2,
+ next_interval = min(next_interval * 2,
(int)round_jiffies_relative(check_interval*HZ));
}
@@ -423,18 +423,18 @@ static struct notifier_block mce_idle_notifier = {
};
static __init int periodic_mcheck_init(void)
-{
+{
next_interval = check_interval * HZ;
if (next_interval)
schedule_delayed_work(&mcheck_work,
round_jiffies_relative(next_interval));
idle_notifier_register(&mce_idle_notifier);
return 0;
-}
+}
__initcall(periodic_mcheck_init);
-/*
+/*
* Initialize Machine Checks for a CPU.
*/
static void mce_init(void *dummy)
@@ -444,9 +444,9 @@ static void mce_init(void *dummy)
rdmsrl(MSR_IA32_MCG_CAP, cap);
banks = cap & 0xff;
- if (banks > NR_BANKS) {
+ if (banks > NR_BANKS) {
printk(KERN_INFO "MCE: warning: using only %d banks\n", banks);
- banks = NR_BANKS;
+ banks = NR_BANKS;
}
/* Use accurate RIP reporting if available. */
if ((cap & (1<<9)) && ((cap >> 16) & 0xff) >= 9)
@@ -464,15 +464,15 @@ static void mce_init(void *dummy)
for (i = 0; i < banks; i++) {
wrmsrl(MSR_IA32_MC0_CTL+4*i, bank[i]);
wrmsrl(MSR_IA32_MC0_STATUS+4*i, 0);
- }
+ }
}
/* Add per CPU specific workarounds here */
static void __cpuinit mce_cpu_quirks(struct cpuinfo_x86 *c)
-{
+{
/* This should be disabled by the BIOS, but isn't always */
if (c->x86_vendor == X86_VENDOR_AMD && c->x86 == 15) {
- /* disable GART TBL walk error reporting, which trips off
+ /* disable GART TBL walk error reporting, which trips off
incorrectly with the IOMMU & 3ware & Cerberus. */
clear_bit(10, &bank[4]);
/* Lots of broken BIOS around that don't clear them
@@ -480,7 +480,7 @@ static void __cpuinit mce_cpu_quirks(struct cpuinfo_x86 *c)
mce_bootlog = 0;
}
-}
+}
static void __cpuinit mce_cpu_features(struct cpuinfo_x86 *c)
{
@@ -496,15 +496,15 @@ static void __cpuinit mce_cpu_features(struct cpuinfo_x86 *c)
}
}
-/*
+/*
* 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 cpumask_t mce_cpus = CPU_MASK_NONE;
- mce_cpu_quirks(c);
+ mce_cpu_quirks(c);
if (mce_dont_init ||
cpu_test_and_set(smp_processor_id(), mce_cpus) ||
@@ -553,13 +553,15 @@ static int mce_release(struct inode *inode, struct file *file)
return 0;
}
-static void collect_tscs(void *data)
-{
+static void collect_tscs(void *data)
+{
unsigned long *cpu_tsc = (unsigned long *)data;
+
rdtscll(cpu_tsc[smp_processor_id()]);
-}
+}
-static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff_t *off)
+static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize,
+ loff_t *off)
{
unsigned long *cpu_tsc;
static DECLARE_MUTEX(mce_read_sem);
@@ -571,19 +573,20 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff
if (!cpu_tsc)
return -ENOMEM;
- down(&mce_read_sem);
+ down(&mce_read_sem);
next = rcu_dereference(mcelog.next);
/* Only supports full reads right now */
- if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
+ if (*off != 0 || usize < MCE_LOG_LEN*sizeof(struct mce)) {
up(&mce_read_sem);
kfree(cpu_tsc);
return -EINVAL;
}
err = 0;
- for (i = 0; i < next; i++) {
+ for (i = 0; i < next; i++) {
unsigned long start = jiffies;
+
while (!mcelog.entry[i].finished) {
if (time_after_eq(jiffies, start + 2)) {
memset(mcelog.entry + i,0, sizeof(struct mce));
@@ -593,31 +596,34 @@ static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff
}
smp_rmb();
err |= copy_to_user(buf, mcelog.entry + i, sizeof(struct mce));
- buf += sizeof(struct mce);
+ buf += sizeof(struct mce);
timeout:
;
- }
+ }
memset(mcelog.entry, 0, next * sizeof(struct mce));
mcelog.next = 0;
synchronize_sched();
- /* Collect entries that were still getting written before the synchronize. */
-
+ /*
+ * Collect entries that were still getting written before the
+ * synchronize.
+ */
on_each_cpu(collect_tscs, cpu_tsc, 1, 1);
- for (i = next; i < MCE_LOG_LEN; i++) {
- if (mcelog.entry[i].finished &&
- mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) {
- err |= copy_to_user(buf, mcelog.entry+i, sizeof(struct mce));
+ for (i = next; i < MCE_LOG_LEN; i++) {
+ if (mcelog.entry[i].finished &&
+ mcelog.entry[i].tsc < cpu_tsc[mcelog.entry[i].cpu]) {
+ err |= copy_to_user(buf, mcelog.entry+i,
+ sizeof(struct mce));
smp_rmb();
buf += sizeof(struct mce);
memset(&mcelog.entry[i], 0, sizeof(struct mce));
}
- }
+ }
up(&mce_read_sem);
kfree(cpu_tsc);
- return err ? -EFAULT : buf - ubuf;
+ return err ? -EFAULT : buf - ubuf;
}
static unsigned int mce_poll(struct file *file, poll_table *wait)
@@ -628,26 +634,29 @@ static unsigned int mce_poll(struct file *file, poll_table *wait)
return 0;
}
-static int mce_ioctl(struct inode *i, struct file *f,unsigned int cmd, unsigned long arg)
+static int mce_ioctl(struct inode *i, struct file *f,unsigned int cmd,
+ unsigned long arg)
{
int __user *p = (int __user *)arg;
+
if (!capable(CAP_SYS_ADMIN))
- return -EPERM;
+ return -EPERM;
switch (cmd) {
- case MCE_GET_RECORD_LEN:
+ case MCE_GET_RECORD_LEN:
return put_user(sizeof(struct mce), p);
case MCE_GET_LOG_LEN:
- return put_user(MCE_LOG_LEN, p);
+ return put_user(MCE_LOG_LEN, p);
case MCE_GETCLEAR_FLAGS: {
unsigned flags;
- do {
+
+ do {
flags = mcelog.flags;
- } while (cmpxchg(&mcelog.flags, flags, 0) != flags);
- return put_user(flags, p);
+ } while (cmpxchg(&mcelog.flags, flags, 0) != flags);
+ return put_user(flags, p);
}
default:
- return -ENOTTY;
- }
+ return -ENOTTY;
+ }
}
static const struct file_operations mce_chrdev_ops = {
@@ -678,10 +687,9 @@ void __init restart_mce(void)
set_in_cr4(X86_CR4_MCE);
}
-/*
- * Old style boot options parsing. Only for compatibility.
+/*
+ * Old style boot options parsing. Only for compatibility.
*/
-
static int __init mcheck_disable(char *str)
{
mce_dont_init = 1;
@@ -702,16 +710,16 @@ static int __init mcheck_enable(char *str)
else if (isdigit(str[0]))
get_option(&str, &tolerant);
else
- printk("mce= argument %s ignored. Please use /sys", str);
+ printk("mce= argument %s ignored. Please use /sys", str);
return 1;
}
__setup("nomce", mcheck_disable);
__setup("mce=", mcheck_enable);
-/*
+/*
* Sysfs support
- */
+ */
/* 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
@@ -723,12 +731,12 @@ static int mce_resume(struct sys_device *dev)
}
/* Reinit MCEs after user configuration changes */
-static void mce_restart(void)
-{
+static void mce_restart(void)
+{
if (next_interval)
cancel_delayed_work(&mcheck_work);
/* Timer race is harmless here */
- on_each_cpu(mce_init, NULL, 1, 1);
+ on_each_cpu(mce_init, NULL, 1, 1);
next_interval = check_interval * HZ;
if (next_interval)
schedule_delayed_work(&mcheck_work,
@@ -744,17 +752,17 @@ DEFINE_PER_CPU(struct sys_device, device_mce);
/* Why are there no generic functions for this? */
#define ACCESSOR(name, var, start) \
- static ssize_t show_ ## name(struct sys_device *s, char *buf) { \
- return sprintf(buf, "%lx\n", (unsigned long)var); \
- } \
+ static ssize_t show_ ## name(struct sys_device *s, char *buf) { \
+ return sprintf(buf, "%lx\n", (unsigned long)var); \
+ } \
static ssize_t set_ ## name(struct sys_device *s,const char *buf,size_t siz) { \
- char *end; \
- unsigned long new = simple_strtoul(buf, &end, 0); \
- if (end == buf) return -EINVAL; \
- var = new; \
- start; \
- return end-buf; \
- } \
+ char *end; \
+ unsigned long new = simple_strtoul(buf, &end, 0); \
+ if (end == buf) return -EINVAL; \
+ var = new; \
+ start; \
+ return end-buf; \
+ } \
static SYSDEV_ATTR(name, 0644, show_ ## name, set_ ## name);
/* TBD should generate these dynamically based on number of available banks */
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-30 02:14:30 +0000