linux-kernel - [PATCH 3/3] x86/mce: Use mce_prep_record() helpers for apei_smca_report_x86

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Date: Tue, 21 May 2024 07:54:34 -0500
From: Yazen Ghannam <yazen.ghannam@....com>
To: <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <tony.luck@...el.com>, <x86@...nel.org>,
	<avadhut.naik@....com>, <john.allen@....com>, Yazen Ghannam
	<yazen.ghannam@....com>
Subject: [PATCH 3/3] x86/mce: Use mce_prep_record() helpers for apei_smca_report_x86_error()

Current AMD systems can report MCA errors using the ACPI Boot Error
Record Table (BERT). The BERT entries for MCA errors will be an x86
Common Platform Error Record (CPER) with an MSR register context that
matches the MCAX/SMCA register space.

However, the BERT will not necessarily be processed on the CPU that
reported the MCA errors. Therefore, the correct CPU number needs to be
determined and the information saved in struct mce.

The CPU number is determined by searching all possible CPUs for a Local
APIC ID matching the value in the x86 CPER.

Use the newly defined mce_prep_record_*() helpers to get the correct
data.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/apei.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/apei.c b/arch/x86/kernel/cpu/mce/apei.c
index 8f509c8a4e98..0cbadfaf2400 100644
--- a/arch/x86/kernel/cpu/mce/apei.c
+++ b/arch/x86/kernel/cpu/mce/apei.c
@@ -97,20 +97,17 @@ int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id)
 	if (ctx_info->reg_arr_size < 48)
 		return -EINVAL;

-	mce_prep_record(&m);
-
-	m.extcpu = -1;
-	m.socketid = -1;
-
 	for_each_possible_cpu(cpu) {
-		if (cpu_data(cpu).topo.initial_apicid == lapic_id) {
-			m.extcpu = cpu;
-			m.socketid = cpu_data(m.extcpu).topo.pkg_id;
+		if (cpu_data(cpu).topo.initial_apicid == lapic_id)
 			break;
-		}
 	}

-	m.apicid = lapic_id;
+	if (!cpu_possible(cpu))
+		return -EINVAL;
+
+	mce_prep_record_common(&m);
+	mce_prep_record_per_cpu(cpu, &m);
+
 	m.bank = (ctx_info->msr_addr >> 4) & 0xFF;
 	m.status = *i_mce;
 	m.addr = *(i_mce + 1);
-- 
2.34.1