linux-hardening - [RFC PATCH 7/9] ACPI: APEI: ESRT: kick ghes_report_chain notifier to report serialized memory errors

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Message-Id: <20230916130316.65815-8-xueshuai@linux.alibaba.com>
Date:   Sat, 16 Sep 2023 21:03:14 +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 7/9] ACPI: APEI: ESRT: kick ghes_report_chain notifier to report serialized memory errors

Introduce a new pstore_record type, PSTORE_TYPE_CPER_MEM, so that
serialized memory errors can be retrieved and saved as a file in pstore
file system. While the serialized errors is retrieved from ERST
backend, kick ghes_report_chain notifier.

Signed-off-by: Shuai Xue <xueshuai@...ux.alibaba.com>
---
 drivers/acpi/apei/erst.c | 5 +++++
 fs/pstore/platform.c     | 1 +
 include/linux/pstore.h   | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index f789e3df73a9..665b8f93dab3 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -26,6 +26,7 @@
 #include <linux/vmalloc.h>
 #include <linux/mm.h> /* kvfree() */
 #include <acpi/apei.h>
+#include <acpi/ghes.h>
 /* only define CREATE_TRACE_POINTS once */
 #include <trace/events/mce.h>
 
@@ -1068,6 +1069,10 @@ static ssize_t erst_reader(struct pstore_record *record)
 	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 if (guid_equal(&rcd->sec_hdr.section_type, &CPER_SEC_PLATFORM_MEM)) {
+		record->type = PSTORE_TYPE_CPER_MEM;
+		arch_apei_report_mem_error(0x2, (struct cper_sec_mem_err *)rcd->data);
+		atomic_notifier_call_chain(&ghes_report_chain, 0x2, rcd->data);
 	}
 	else
 		record->type = PSTORE_TYPE_MAX;
diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index e5bca9a004cc..4e63ac8be755 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -51,6 +51,7 @@ static const char * const pstore_type_names[] = {
 	"powerpc-common",
 	"pmsg",
 	"powerpc-opal",
+	"cper-mem",
 };
 
 static int pstore_new_entry;
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index ad44b3baf10e..d18ecaacd1b5 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -40,6 +40,9 @@ enum pstore_type_id {
 	PSTORE_TYPE_PMSG	= 7,
 	PSTORE_TYPE_PPC_OPAL	= 8,
 
+	/* APEI section */
+	PSTORE_TYPE_CPER_MEM		= 9,
+
 	/* End of the list */
 	PSTORE_TYPE_MAX
 };
-- 
2.41.0