linux-kernel - [RFC PATCH 3/9] ACPI: APEI: ERST: Emit the mce

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Date:   Sat, 16 Sep 2023 21:03:10 +0800
From:   Shuai Xue <xueshuai@...ux.alibaba.com>
To:     keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
        rafael@...nel.org, lenb@...nel.org, james.morse@....com,
        bp@...en8.de, tglx@...utronix.de, mingo@...hat.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        ardb@...nel.org, robert.moore@...el.com
Cc:     linux-hardening@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
        linux-efi@...r.kernel.org, acpica-devel@...ts.linuxfoundation.org,
        xueshuai@...ux.alibaba.com, baolin.wang@...ux.alibaba.com
Subject: [RFC PATCH 3/9] ACPI: APEI: ERST: Emit the mce_record tracepoint

After /dev/mcelog character device deprecated by commit 5de97c9f6d85
("x86/mce: Factor out and deprecate the /dev/mcelog driver"), the
serialized hardware error log, a.k.a MCE record, of previous boot in
persistent storage is not collected via APEI ERST.

Emit the mce_record tracepoint so that it can consumed by the new
generation rasdaemon.

Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
---
 drivers/acpi/apei/erst.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index 528ac5eb4871..f789e3df73a9 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -26,6 +26,8 @@
 #include <linux/vmalloc.h>
 #include <linux/mm.h> /* kvfree() */
 #include <acpi/apei.h>
+/* only define CREATE_TRACE_POINTS once */
+#include <trace/events/mce.h>
 
 #include "apei-internal.h"
 
@@ -1063,8 +1065,10 @@ static ssize_t erst_reader(struct pstore_record *record)
 		record->compressed = true;
 	} else if (guid_equal(&rcd->sec_hdr.section_type, &CPER_SECTION_TYPE_DMESG))
 		record->type = PSTORE_TYPE_DMESG;
-	else if (guid_equal(&rcd->sec_hdr.section_type, &CPER_SECTION_TYPE_MCE))
+	else if (guid_equal(&rcd->sec_hdr.section_type, &CPER_SECTION_TYPE_MCE)) {
+		trace_mce_record((struct mce *)rcd->data);
 		record->type = PSTORE_TYPE_MCE;
+	}
 	else
 		record->type = PSTORE_TYPE_MAX;
 
-- 
2.41.0