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x86/mce: Carve out bank scanning code

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Carve out the scan loop into a separate function.

No functional changes.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20180622095428.626-6-bp@alien8.de
This commit is contained in:
Borislav Petkov 2018-06-22 11:54:26 +02:00 committed by Thomas Gleixner
parent 45deca7d96
commit f35565e398
1 changed files with 71 additions and 63 deletions
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134
arch/x86/kernel/cpu/mcheck/mce.c
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@ -1132,6 +1132,76 @@ static bool __mc_check_crashing_cpu(int cpu)
return false;
}
static void __mc_scan_banks(struct mce *m, struct mce *final,
unsigned long *toclear, unsigned long *valid_banks,
int no_way_out, int *worst)
{
struct mca_config *cfg = &mca_cfg;
int severity, i;
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;
}
/*
* The actual machine check handler. This only handles real
* exceptions when something got corrupted coming in through int 18.
@ -1153,8 +1223,6 @@ void do_machine_check(struct pt_regs *regs, long error_code)
char *msg = "Unknown";
struct mce m, *final;
int worst = 0;
int severity;
int i;
/*
* Establish sequential order between the CPUs entering the machine
@ -1227,67 +1295,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
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;
__mc_scan_banks(&m, final, toclear, valid_banks, no_way_out, &worst);
if (!no_way_out)
mce_clear_state(toclear);