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x86/mce/amd: Make threshold bank setting hotplug robust

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Handle the cases when the CPU goes offline before the bank
setting/reading happens.

 [ bp: Write commit message. ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200403161943.1458-8-bp@alien8.de
This commit is contained in:
Thomas Gleixner 2020-03-31 13:16:44 +02:00 committed by Borislav Petkov
parent f26d2580a7
commit a037f3ca0e
1 changed files with 11 additions and 3 deletions
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14
arch/x86/kernel/cpu/mce/amd.c
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@ -386,6 +386,10 @@ static void threshold_restart_bank(void *_tr)
struct thresh_restart *tr = _tr;
u32 hi, lo;
/* sysfs write might race against an offline operation */
if (this_cpu_read(threshold_banks))
return;
rdmsr(tr->b->address, lo, hi);
if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
@ -1085,7 +1089,8 @@ store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
memset(&tr, 0, sizeof(tr));
tr.b = b;
smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
return -ENODEV;
return size;
}
@ -1109,7 +1114,8 @@ store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
b->threshold_limit = new;
tr.b = b;
smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1);
if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
return -ENODEV;
return size;
}
@ -1118,7 +1124,9 @@ static ssize_t show_error_count(struct threshold_block *b, char *buf)
{
u32 lo, hi;
rdmsr_on_cpu(b->cpu, b->address, &lo, &hi);
/* CPU might be offline by now */
if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi))
return -ENODEV;
return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
(THRESHOLD_MAX - b->threshold_limit)));