#include <linux/sysdev.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
+#include <linux/cpu.h>
+#include <linux/percpu.h>
+#include <linux/ctype.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/mce.h>
static unsigned long bank[NR_BANKS] = { [0 ... NR_BANKS-1] = ~0UL };
static unsigned long console_logged;
static int notify_user;
+static int rip_msr;
+static int mce_bootlog;
/*
* Lockless MCE logging infrastructure.
smp_wmb();
for (;;) {
entry = rcu_dereference(mcelog.next);
- /* When the buffer fills up discard new entries. Assume
- that the earlier errors are the more interesting. */
- if (entry >= MCE_LOG_LEN) {
- set_bit(MCE_OVERFLOW, &mcelog.flags);
- return;
+ for (;;) {
+ /* When the buffer fills up discard new entries. Assume
+ that the earlier errors are the more interesting. */
+ if (entry >= MCE_LOG_LEN) {
+ set_bit(MCE_OVERFLOW, &mcelog.flags);
+ return;
+ }
+ /* Old left over entry. Skip. */
+ if (mcelog.entry[entry].finished) {
+ entry++;
+ continue;
+ }
}
- /* Old left over entry. Skip. */
- if (mcelog.entry[entry].finished)
- continue;
smp_rmb();
next = entry + 1;
if (cmpxchg(&mcelog.next, entry, next) == entry)
test_bit(X86_FEATURE_MCA, &c->x86_capability);
}
+static inline void mce_get_rip(struct mce *m, struct pt_regs *regs)
+{
+ if (regs && (m->mcgstatus & MCG_STATUS_RIPV)) {
+ m->rip = regs->rip;
+ m->cs = regs->cs;
+ } else {
+ m->rip = 0;
+ m->cs = 0;
+ }
+ if (rip_msr) {
+ /* Assume the RIP in the MSR is exact. Is this true? */
+ m->mcgstatus |= MCG_STATUS_EIPV;
+ rdmsrl(rip_msr, m->rip);
+ m->cs = 0;
+ }
+}
+
/*
* The actual machine check handler
*/
if (m.status & MCI_STATUS_ADDRV)
rdmsrl(MSR_IA32_MC0_ADDR + i*4, m.addr);
- if (regs && (m.mcgstatus & MCG_STATUS_RIPV)) {
- m.rip = regs->rip;
- m.cs = regs->cs;
- } else {
- m.rip = 0;
- m.cs = 0;
- }
-
- if (error_code != -1)
+ mce_get_rip(&m, regs);
+ if (error_code >= 0)
rdtscll(m.tsc);
wrmsrl(MSR_IA32_MC0_STATUS + i*4, 0);
- mce_log(&m);
+ if (error_code != -2)
+ mce_log(&m);
/* Did this bank cause the exception? */
/* Assume that the bank with uncorrectable errors did it,
printk(KERN_INFO "MCE: warning: using only %d banks\n", banks);
banks = NR_BANKS;
}
+ /* Use accurate RIP reporting if available. */
+ if ((cap & (1<<9)) && ((cap >> 16) & 0xff) >= 9)
+ rip_msr = MSR_IA32_MCG_EIP;
/* Log the machine checks left over from the previous reset.
This also clears all registers */
- do_machine_check(NULL, -1);
+ do_machine_check(NULL, mce_bootlog ? -1 : -2);
set_in_cr4(X86_CR4_MCE);
}
/* Add per CPU specific workarounds here */
-static void __init mce_cpu_quirks(struct cpuinfo_x86 *c)
+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) {
}
}
-static void __init mce_cpu_features(struct cpuinfo_x86 *c)
+static void __cpuinit mce_cpu_features(struct cpuinfo_x86 *c)
{
switch (c->x86_vendor) {
case X86_VENDOR_INTEL:
* Called for each booted CPU to set up machine checks.
* Must be called with preempt off.
*/
-void __init mcheck_init(struct cpuinfo_x86 *c)
+void __cpuinit mcheck_init(struct cpuinfo_x86 *c)
{
static cpumask_t mce_cpus __initdata = CPU_MASK_NONE;
static ssize_t mce_read(struct file *filp, char __user *ubuf, size_t usize, loff_t *off)
{
- unsigned long cpu_tsc[NR_CPUS];
+ unsigned long *cpu_tsc;
static DECLARE_MUTEX(mce_read_sem);
unsigned next;
char __user *buf = ubuf;
int i, err;
+ cpu_tsc = kmalloc(NR_CPUS * sizeof(long), GFP_KERNEL);
+ if (!cpu_tsc)
+ return -ENOMEM;
+
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)) {
up(&mce_read_sem);
+ kfree(cpu_tsc);
return -EINVAL;
}
err = 0;
- for (i = 0; i < next; i++) {
- if (!mcelog.entry[i].finished)
- continue;
+ for (i = 0; i < next; i++) {
+ unsigned long start = jiffies;
+ while (!mcelog.entry[i].finished) {
+ if (!time_before(jiffies, start + 2)) {
+ memset(mcelog.entry + i,0, sizeof(struct mce));
+ continue;
+ }
+ cpu_relax();
+ }
smp_rmb();
err |= copy_to_user(buf, mcelog.entry + i, sizeof(struct mce));
buf += sizeof(struct mce);
memset(mcelog.entry, 0, next * sizeof(struct mce));
mcelog.next = 0;
- synchronize_kernel();
+ synchronize_sched();
/* Collect entries that were still getting written before the synchronize. */
}
}
up(&mce_read_sem);
+ kfree(cpu_tsc);
return err ? -EFAULT : buf - ubuf;
}
}
/* mce=off disables machine check. Note you can reenable it later
- using sysfs */
+ using sysfs.
+ mce=TOLERANCELEVEL (number, see above)
+ mce=bootlog Log MCEs from before booting. Disabled by default to work
+ around buggy BIOS that leave bogus MCEs. */
static int __init mcheck_enable(char *str)
{
+ if (*str == '=')
+ str++;
if (!strcmp(str, "off"))
mce_dont_init = 1;
+ else if (!strcmp(str, "bootlog"))
+ mce_bootlog = 1;
+ else if (isdigit(str[0]))
+ get_option(&str, &tolerant);
else
printk("mce= argument %s ignored. Please use /sys", str);
return 0;
* Sysfs support
*/
-/* On resume clear all MCE state. Don't want to see leftovers from the BIOS. */
+/* 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. */
static int mce_resume(struct sys_device *dev)
{
- on_each_cpu(mce_init, NULL, 1, 1);
+ mce_init(NULL);
return 0;
}
set_kset_name("machinecheck"),
};
-static struct sys_device device_mce = {
- .id = 0,
- .cls = &mce_sysclass,
-};
+static DEFINE_PER_CPU(struct sys_device, device_mce);
/* Why are there no generic functions for this? */
#define ACCESSOR(name, var, start) \
ACCESSOR(tolerant,tolerant,)
ACCESSOR(check_interval,check_interval,mce_restart())
+/* Per cpu sysdev init. All of the cpus still share the same ctl bank */
+static __cpuinit int mce_create_device(unsigned int cpu)
+{
+ int err;
+ if (!mce_available(&cpu_data[cpu]))
+ return -EIO;
+
+ per_cpu(device_mce,cpu).id = cpu;
+ per_cpu(device_mce,cpu).cls = &mce_sysclass;
+
+ err = sysdev_register(&per_cpu(device_mce,cpu));
+
+ if (!err) {
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank0ctl);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank1ctl);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank2ctl);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank3ctl);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank4ctl);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_tolerant);
+ sysdev_create_file(&per_cpu(device_mce,cpu), &attr_check_interval);
+ }
+ return err;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static __cpuinit void mce_remove_device(unsigned int cpu)
+{
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank0ctl);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank1ctl);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank2ctl);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank3ctl);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank4ctl);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_tolerant);
+ sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_check_interval);
+ sysdev_unregister(&per_cpu(device_mce,cpu));
+}
+#endif
+
+/* Get notified when a cpu comes on/off. Be hotplug friendly. */
+static __cpuinit int
+mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ mce_create_device(cpu);
+ break;
+#ifdef CONFIG_HOTPLUG_CPU
+ case CPU_DEAD:
+ mce_remove_device(cpu);
+ break;
+#endif
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block mce_cpu_notifier = {
+ .notifier_call = mce_cpu_callback,
+};
+
static __init int mce_init_device(void)
{
int err;
+ int i = 0;
+
if (!mce_available(&boot_cpu_data))
return -EIO;
err = sysdev_class_register(&mce_sysclass);
- if (!err)
- err = sysdev_register(&device_mce);
- if (!err) {
- /* could create per CPU objects, but it is not worth it. */
- sysdev_create_file(&device_mce, &attr_bank0ctl);
- sysdev_create_file(&device_mce, &attr_bank1ctl);
- sysdev_create_file(&device_mce, &attr_bank2ctl);
- sysdev_create_file(&device_mce, &attr_bank3ctl);
- sysdev_create_file(&device_mce, &attr_bank4ctl);
- sysdev_create_file(&device_mce, &attr_tolerant);
- sysdev_create_file(&device_mce, &attr_check_interval);
- }
-
+
+ for_each_online_cpu(i) {
+ mce_create_device(i);
+ }
+
+ register_cpu_notifier(&mce_cpu_notifier);
misc_register(&mce_log_device);
return err;
-
}
+
device_initcall(mce_init_device);
git.openpandora.org / pandora-kernel.git / blobdiff