linux-hardening - [RFC PATCH v2 7/9] ACPI: APEI: ESRT: kick ghes_report_chain notifier to report serialized memory errors

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Date: Mon, 25 Sep 2023 15:44:24 +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 v2 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 82f57aaf89ad..786d46c767ee 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>
 #ifdef CONFIG_X86_MCE
 /* only define CREATE_TRACE_POINTS once */
 #include <trace/events/mce.h>
@@ -1072,6 +1073,10 @@ static ssize_t erst_reader(struct pstore_record *record)
 		trace_mce_record((struct mce *)rcd->data);
 #endif
 		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