linux-kernel - [PATCH v2 2/2] cper,edac,efi: Memory Error Record: bank group/address and chip id

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Date:   Wed, 19 Aug 2020 09:35:44 -0500
From:   Alex Kluver <alex.kluver@....com>
To:     linux-edac@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     ardb@...nel.org, mchehab@...nel.org, bp@...en8.de,
        russ.anderson@....com, dimitri.sivanich@....com,
        kluveralex@...il.com, Alex Kluver <alex.kluver@....com>
Subject: [PATCH v2 2/2] cper,edac,efi: Memory Error Record: bank group/address and chip id

Updates to the UEFI 2.8 Memory Error Record allow splitting the bank field
into bank address and bank group, and using the last 3 bits of the extended
field as a chip identifier.

When needed, print correct version of bank field, bank group, and chip
identification

Based on UEFI 2.8 Table 299. Memory Error Record

Reviewed-by: Steve Wahl <steve.wahl@....com>
Reviewed-by: Kyle Meyer <kyle.meyer@....com>
Reviewed-by: Russ Anderson <russ.anderson@....com>
Signed-off-by: Alex Kluver <alex.kluver@....com>
---

v1 -> v2:
   * Add static inline cper_get_mem_extension() to make it
    more readable, as suggested by Borislav Petkov.

   * Add second patch for bank field, bank group, and chip id.

---
 drivers/edac/ghes_edac.c    | 9 +++++++++
 drivers/firmware/efi/cper.c | 9 +++++++++
 include/linux/cper.h        | 8 ++++++++
 3 files changed, 26 insertions(+)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 98fcdaf72a09..31eb72b67265 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -337,6 +337,12 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 		p += sprintf(p, "rank:%d ", mem_err->rank);
 	if (mem_err->validation_bits & CPER_MEM_VALID_BANK)
 		p += sprintf(p, "bank:%d ", mem_err->bank);
+	if (mem_err->validation_bits & CPER_MEM_VALID_BANK_GROUP)
+		p += sprintf(p, "bank_group:%d ",
+			     mem_err->bank >> CPER_MEM_BANK_GROUP_SHIFT);
+	if (mem_err->validation_bits & CPER_MEM_VALID_BANK_ADDRESS)
+		p += sprintf(p, "bank_address:%d ",
+			     mem_err->bank & CPER_MEM_BANK_ADDRESS_MASK);
 	if (mem_err->validation_bits & (CPER_MEM_VALID_ROW | CPER_MEM_VALID_ROW_EXT)) {
 		u32 row = mem_err->row;
 
@@ -362,6 +368,9 @@ void ghes_edac_report_mem_error(int sev, struct cper_sec_mem_err *mem_err)
 		if (index >= 0)
 			e->top_layer = index;
 	}
+	if (mem_err->validation_bits & CPER_MEM_VALID_CHIP_ID)
+		p += sprintf(p, "chipID: %d ",
+			     mem_err->extended >> CPER_MEM_CHIP_ID_SHIFT);
 	if (p > e->location)
 		*(p - 1) = '\0';
 
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index a60acd17bcaa..e15d484b6a5a 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -232,6 +232,12 @@ static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
 		n += scnprintf(msg + n, len - n, "rank: %d ", mem->rank);
 	if (mem->validation_bits & CPER_MEM_VALID_BANK)
 		n += scnprintf(msg + n, len - n, "bank: %d ", mem->bank);
+	if (mem->validation_bits & CPER_MEM_VALID_BANK_GROUP)
+		n += scnprintf(msg + n, len - n, "bank_group: %d ",
+			       mem->bank >> CPER_MEM_BANK_GROUP_SHIFT);
+	if (mem->validation_bits & CPER_MEM_VALID_BANK_ADDRESS)
+		n += scnprintf(msg + n, len - n, "bank_address: %d ",
+			       mem->bank & CPER_MEM_BANK_ADDRESS_MASK);
 	if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
 		n += scnprintf(msg + n, len - n, "device: %d ", mem->device);
 	if (mem->validation_bits & (CPER_MEM_VALID_ROW | CPER_MEM_VALID_ROW_EXT)) {
@@ -254,6 +260,9 @@ static int cper_mem_err_location(struct cper_mem_err_compact *mem, char *msg)
 	if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID)
 		scnprintf(msg + n, len - n, "target_id: 0x%016llx ",
 			  mem->target_id);
+	if (mem->validation_bits & CPER_MEM_VALID_CHIP_ID)
+		scnprintf(msg + n, len - n, "chip_id: %d ",
+			  mem->extended >> CPER_MEM_CHIP_ID_SHIFT);
 
 	msg[n] = '\0';
 	return n;
diff --git a/include/linux/cper.h b/include/linux/cper.h
index bd2d8a77a784..6a511a1078ca 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -231,10 +231,18 @@ enum {
 #define CPER_MEM_VALID_CARD_HANDLE		0x10000
 #define CPER_MEM_VALID_MODULE_HANDLE		0x20000
 #define CPER_MEM_VALID_ROW_EXT			0x40000
+#define CPER_MEM_VALID_BANK_GROUP		0x80000
+#define CPER_MEM_VALID_BANK_ADDRESS		0x100000
+#define CPER_MEM_VALID_CHIP_ID			0x200000
 
 #define CPER_MEM_EXT_ROW_MASK			0x3
 #define CPER_MEM_EXT_ROW_SHIFT			16
 
+#define CPER_MEM_BANK_ADDRESS_MASK		0xff
+#define CPER_MEM_BANK_GROUP_SHIFT		8
+
+#define CPER_MEM_CHIP_ID_SHIFT			5
+
 #define CPER_PCIE_VALID_PORT_TYPE		0x0001
 #define CPER_PCIE_VALID_VERSION			0x0002
 #define CPER_PCIE_VALID_COMMAND_STATUS		0x0004
-- 
2.26.2