Generally, MCA information for an error is gathered on the CPU that
reported the error. In this case, CPU-specific information from the
running CPU will be correct.
However, this will be incorrect if the MCA information is gathered while
running on a CPU that didn't report the error. One example is creating
an MCA record using mce_setup() for errors reported from ACPI.
Split mce_setup() so that there is a helper function to gather global,
i.e. not CPU-specific, information and another helper for CPU-specific
information.
Don't set the CPU number in either helper function. This will be set
appropriately for each call site of the helpers.
Leave mce_setup() defined as-is for the common case when running on the
reporting CPU.
Get MCG_CAP in the global helper even though the register is per-CPU.
This value is not already cached per-CPU like other values. And it does
not assist with any per-CPU decoding or handling.
Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
---
arch/x86/kernel/cpu/mce/core.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 1642018dd6c9..7e86086aa19c 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -115,20 +115,31 @@ static struct irq_work mce_irq_work;
*/
BLOCKING_NOTIFIER_HEAD(x86_mce_decoder_chain);
+void mce_setup_global(struct mce *m)
+{
+ memset(m, 0, sizeof(struct mce));
+
+ m->cpuid = cpuid_eax(1);
+ m->cpuvendor = boot_cpu_data.x86_vendor;
+ m->mcgcap = __rdmsr(MSR_IA32_MCG_CAP);
+ /* need the internal __ version to avoid deadlocks */
+ m->time = __ktime_get_real_seconds();
+}
+
+void mce_setup_per_cpu(struct mce *m)
+{
+ m->apicid = cpu_data(m->extcpu).topo.initial_apicid;
+ m->microcode = cpu_data(m->extcpu).microcode;
+ m->ppin = cpu_data(m->extcpu).ppin;
+ m->socketid = cpu_data(m->extcpu).topo.pkg_id;
+}
+
/* Do initial initialization of a struct mce */
void mce_setup(struct mce *m)
{
- memset(m, 0, sizeof(struct mce));
+ mce_setup_global(m);
m->cpu = m->extcpu = smp_processor_id();
- /* need the internal __ version to avoid deadlocks */
- m->time = __ktime_get_real_seconds();
- m->cpuvendor = boot_cpu_data.x86_vendor;
- m->cpuid = cpuid_eax(1);
- m->socketid = cpu_data(m->extcpu).topo.pkg_id;
- m->apicid = cpu_data(m->extcpu).topo.initial_apicid;
- m->mcgcap = __rdmsr(MSR_IA32_MCG_CAP);
- m->ppin = cpu_data(m->extcpu).ppin;
- m->microcode = boot_cpu_data.microcode;
+ mce_setup_per_cpu(m);
}
DEFINE_PER_CPU(struct mce, injectm);
--
2.34.1
