[PATCH] efi: cper: Add support for printing Firmware Error Record Reference

[Punit Agrawal]

While debugging a boot failure, the following unknown error record was
seen in the boot logs.

    <...>
    BERT: Error records from previous boot:
    [Hardware Error]: event severity: fatal
    [Hardware Error]:  Error 0, type: fatal
    [Hardware Error]:   section type: unknown, 81212a96-09ed-4996-9471-8d729c8e69ed
    [Hardware Error]:   section length: 0x290
    [Hardware Error]:   00000000: 00000001 00000000 00000000 00020002  ................
    [Hardware Error]:   00000010: 00020002 0000001f 00000320 00000000  ........ .......
    [Hardware Error]:   00000020: 00000000 00000000 00000000 00000000  ................
    [Hardware Error]:   00000030: 00000000 00000000 00000000 00000000  ................
    <...>

On further investigation, it was found that the error record with
UUID (81212a96-09ed-4996-9471-8d729c8e69ed) has been defined in the
UEFI Specification at least since v2.4 and has recently had additional
fields defined in v2.7 Section N.2.10 Firmware Error Record Reference.

Add support for parsing and printing the defined fields to give users
a chance to figure out what's went wrong.

Signed-off-by: Punit Agrawal <punit1.agrawal@xxxxxxxxxxxxx>
Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Cc: linux-efi@xxxxxxxxxxxxxxx
---

Hi,

I ran into this while debugging a boot failure on an end product
device. Parsing known record types can help the user narrow down the
investigation quickly to the failing components - firmware error in
this case.

It would be good to support the record types specified in the
standard.

Feedback welcome.

Thanks,
Punit
---
 drivers/firmware/efi/cper.c | 49 +++++++++++++++++++++++++++++++++++++
 include/linux/cper.h        | 11 +++++++++
 2 files changed, 60 insertions(+)

diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index 9d2512913d25..153b95257e23 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -407,6 +407,46 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	}
 }
 
+static const char * const fw_err_rec_type_strs[] = {
+	"IPF SAL Error Record",
+	"SOC Firmware Error Record Type1 (Legacy CrashLog Support)",
+	"SOC Firmware Error Record Type2",
+};
+
+static void cper_print_fw_err(const char *pfx,
+			      struct acpi_hest_generic_data *gdata,
+			      const struct cper_sec_fw_err_rec_ref *fw_err)
+{
+	void *buf = acpi_hest_get_payload(gdata);
+	u32 offset, length = gdata->error_data_length;
+
+	printk("%s""Firmware Error Record Type: %s\n", pfx,
+	       fw_err->record_type < ARRAY_SIZE(fw_err_rec_type_strs) ?
+	       fw_err_rec_type_strs[fw_err->record_type] : "unknown");
+
+	/* Record Type based on UEFI 2.7 */
+	if (fw_err->revision == 0)
+		printk("%s""Record Identifier: %08llx\n", pfx,
+		       fw_err->record_identifier);
+	else if (fw_err->revision == 2)
+		printk("%s""Record Identifier: %pUl\n", pfx,
+		       &fw_err->record_identifier_guid);
+
+	if (fw_err->revision == 0)
+		offset = offsetof(struct cper_sec_fw_err_rec_ref,
+				  record_identifier_guid);
+	else if (fw_err->revision == 1)
+		offset = offsetof(struct cper_sec_fw_err_rec_ref,
+				  record_identifier);
+	else
+		offset = sizeof(*fw_err);
+
+	buf += offset;
+	length -= offset;
+
+	print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, buf, length, true);
+}
+
 static void cper_print_tstamp(const char *pfx,
 				   struct acpi_hest_generic_data_v300 *gdata)
 {
@@ -494,6 +534,15 @@ cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata
 		else
 			goto err_section_too_small;
 #endif
+	} else if (guid_equal(sec_type, &CPER_SEC_FW_ERR_REC_REF)) {
+		struct cper_sec_fw_err_rec_ref *fw_err = acpi_hest_get_payload(gdata);
+
+		printk("%ssection_type: Firmware Error Record Reference\n",
+		       newpfx);
+		if (gdata->error_data_length >= sizeof(*fw_err))
+			cper_print_fw_err(newpfx, gdata, fw_err);
+		else
+			goto err_section_too_small;
 	} else {
 		const void *err = acpi_hest_get_payload(gdata);
 
diff --git a/include/linux/cper.h b/include/linux/cper.h
index 4f005d95ce88..5cb57e69df70 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -521,6 +521,17 @@ struct cper_sec_pcie {
 	u8	aer_info[96];
 };
 
+/* Firmware Error Record Reference, UEFI v2.7 sec N.2.10  */
+struct cper_sec_fw_err_rec_ref {
+	u8 record_type;
+	union {
+		u8 revision;
+		u8 reserved[7];
+	};
+	u64 record_identifier;
+	guid_t record_identifier_guid;
+};
+
 /* Reset to default packing */
 #pragma pack()
 
-- 
2.26.2