/* Caller must hold the lock on cmci_discover_lock */
static void __cmci_disable_bank(int bank)
{
u64 val;
if (!test_bit(bank, __get_cpu_var(mce_banks_owned)))
return;
rdmsrl(MSR_IA32_MCx_CTL2(bank), val);
val &= ~MCI_CTL2_CMCI_EN;
wrmsrl(MSR_IA32_MCx_CTL2(bank), val);
__clear_bit(bank, __get_cpu_var(mce_banks_owned));
}
static void cmci_storm_disable_banks(void)
{
unsigned long flags, *owned;
int bank;
u64 val;
raw_spin_lock_irqsave(&cmci_discover_lock, flags);
owned = this_cpu_ptr(mce_banks_owned);
for_each_set_bit(bank, owned, MAX_NR_BANKS) {
rdmsrl(MSR_IA32_MCx_CTL2(bank), val);
val &= ~MCI_CTL2_CMCI_EN;
wrmsrl(MSR_IA32_MCx_CTL2(bank), val);
}
static void cmci_toggle_interrupt_mode(bool on)
{
unsigned long flags, *owned;
int bank;
u64 val;
raw_spin_lock_irqsave(&cmci_discover_lock, flags);
owned = this_cpu_ptr(mce_banks_owned);
for_each_set_bit(bank, owned, MAX_NR_BANKS) {
rdmsrl(MSR_IA32_MCx_CTL2(bank), val);
if (on)
val |= MCI_CTL2_CMCI_EN;
else
val &= ~MCI_CTL2_CMCI_EN;
wrmsrl(MSR_IA32_MCx_CTL2(bank), val);
}
/*
* Enable CMCI (Corrected Machine Check Interrupt) for available MCE banks
* on this CPU. Use the algorithm recommended in the SDM to discover shared
* banks.
*/
static void cmci_discover(int banks, int boot)
{
unsigned long *owned = (void *)&__get_cpu_var(mce_banks_owned);
unsigned long flags;
int hdr = 0;
int i;
spin_lock_irqsave(&cmci_discover_lock, flags);
for (i = 0; i < banks; i++) {
u64 val;
if (test_bit(i, owned))
continue;
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
/* Already owned by someone else? */
if (val & CMCI_EN) {
if (test_and_clear_bit(i, owned) || boot)
print_update("SHD", &hdr, i);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
continue;
}
val |= CMCI_EN | CMCI_THRESHOLD;
wrmsrl(MSR_IA32_MCx_CTL2(i), val);
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
/* Did the enable bit stick? -- the bank supports CMCI */
if (val & CMCI_EN) {
if (!test_and_set_bit(i, owned) || boot)
print_update("CMCI", &hdr, i);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
} else {
WARN_ON(!test_bit(i, __get_cpu_var(mce_poll_banks)));
}
}
spin_unlock_irqrestore(&cmci_discover_lock, flags);
if (hdr)
printk(KERN_CONT "\n");
}
/*
* Disable CMCI on this CPU for all banks it owns when it goes down.
* This allows other CPUs to claim the banks on rediscovery.
*/
void cmci_clear(void)
{
unsigned long flags;
int i;
int banks;
u64 val;
if (!cmci_supported(&banks))
return;
spin_lock_irqsave(&cmci_discover_lock, flags);
for (i = 0; i < banks; i++) {
if (!test_bit(i, __get_cpu_var(mce_banks_owned)))
continue;
/* Disable CMCI */
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
val &= ~(CMCI_EN|CMCI_THRESHOLD_MASK);
wrmsrl(MSR_IA32_MCx_CTL2(i), val);
__clear_bit(i, __get_cpu_var(mce_banks_owned));
}
spin_unlock_irqrestore(&cmci_discover_lock, flags);
}
/*
* Enable CMCI (Corrected Machine Check Interrupt) for available MCE banks
* on this CPU. Use the algorithm recommended in the SDM to discover shared
* banks.
*/
static void cmci_discover(int banks)
{
unsigned long *owned = (void *)&__get_cpu_var(mce_banks_owned);
unsigned long flags;
int i;
int bios_wrong_thresh = 0;
raw_spin_lock_irqsave(&cmci_discover_lock, flags);
for (i = 0; i < banks; i++) {
u64 val;
int bios_zero_thresh = 0;
if (test_bit(i, owned))
continue;
/* Skip banks in firmware first mode */
if (test_bit(i, mce_banks_ce_disabled))
continue;
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
/* Already owned by someone else? */
if (val & MCI_CTL2_CMCI_EN) {
clear_bit(i, owned);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
continue;
}
if (!mca_cfg.bios_cmci_threshold) {
val &= ~MCI_CTL2_CMCI_THRESHOLD_MASK;
val |= CMCI_THRESHOLD;
} else if (!(val & MCI_CTL2_CMCI_THRESHOLD_MASK)) {
/*
* If bios_cmci_threshold boot option was specified
* but the threshold is zero, we'll try to initialize
* it to 1.
*/
bios_zero_thresh = 1;
val |= CMCI_THRESHOLD;
}
val |= MCI_CTL2_CMCI_EN;
wrmsrl(MSR_IA32_MCx_CTL2(i), val);
rdmsrl(MSR_IA32_MCx_CTL2(i), val);
/* Did the enable bit stick? -- the bank supports CMCI */
if (val & MCI_CTL2_CMCI_EN) {
set_bit(i, owned);
__clear_bit(i, __get_cpu_var(mce_poll_banks));
/*
* We are able to set thresholds for some banks that
* had a threshold of 0. This means the BIOS has not
* set the thresholds properly or does not work with
* this boot option. Note down now and report later.
*/
if (mca_cfg.bios_cmci_threshold && bios_zero_thresh &&
(val & MCI_CTL2_CMCI_THRESHOLD_MASK))
bios_wrong_thresh = 1;
} else {
WARN_ON(!test_bit(i, __get_cpu_var(mce_poll_banks)));
}
}
raw_spin_unlock_irqrestore(&cmci_discover_lock, flags);
if (mca_cfg.bios_cmci_threshold && bios_wrong_thresh) {
pr_info_once(
"bios_cmci_threshold: Some banks do not have valid thresholds set\n");
pr_info_once(
"bios_cmci_threshold: Make sure your BIOS supports this boot option\n");
}
}