linux-kernel - [PATCH 06/17] efi: Decode UEFI-defined IA32/X64 Error Structure GUIDs

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Date:   Fri,  4 May 2018 07:59:52 +0200
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     linux-efi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Yazen Ghannam <yazen.ghannam@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 06/17] efi: Decode UEFI-defined IA32/X64 Error Structure GUIDs

From: Yazen Ghannam <yazen.ghannam@....com>

For easier handling, match the known IA32/X64 error structure GUIDs to
enums.

Also, print out the name of the matching Error Structure Type.

Only print the GUID for unknown types.

GUIDs taken from UEFI 2.7 section N.2.4.2.1 IA32/X64 Processor Error
Information Structure.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
---
 drivers/firmware/efi/cper-x86.c | 47 +++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c
index e0633a103fcf..5438097b93ac 100644
--- a/drivers/firmware/efi/cper-x86.c
+++ b/drivers/firmware/efi/cper-x86.c
@@ -11,17 +11,53 @@
 #define VALID_CPUID_INFO		BIT_ULL(1)
 #define VALID_PROC_ERR_INFO_NUM(bits)	(((bits) & GENMASK_ULL(7, 2)) >> 2)
 
+#define INFO_ERR_STRUCT_TYPE_CACHE					\
+	GUID_INIT(0xA55701F5, 0xE3EF, 0x43DE, 0xAC, 0x72, 0x24, 0x9B,	\
+		  0x57, 0x3F, 0xAD, 0x2C)
+#define INFO_ERR_STRUCT_TYPE_TLB					\
+	GUID_INIT(0xFC06B535, 0x5E1F, 0x4562, 0x9F, 0x25, 0x0A, 0x3B,	\
+		  0x9A, 0xDB, 0x63, 0xC3)
+#define INFO_ERR_STRUCT_TYPE_BUS					\
+	GUID_INIT(0x1CF3F8B3, 0xC5B1, 0x49a2, 0xAA, 0x59, 0x5E, 0xEF,	\
+		  0x92, 0xFF, 0xA6, 0x3C)
+#define INFO_ERR_STRUCT_TYPE_MS						\
+	GUID_INIT(0x48AB7F57, 0xDC34, 0x4f6c, 0xA7, 0xD3, 0xB0, 0xB5,	\
+		  0xB0, 0xA7, 0x43, 0x14)
+
 #define INFO_VALID_CHECK_INFO		BIT_ULL(0)
 #define INFO_VALID_TARGET_ID		BIT_ULL(1)
 #define INFO_VALID_REQUESTOR_ID		BIT_ULL(2)
 #define INFO_VALID_RESPONDER_ID		BIT_ULL(3)
 #define INFO_VALID_IP			BIT_ULL(4)
 
+enum err_types {
+	ERR_TYPE_CACHE = 0,
+	ERR_TYPE_TLB,
+	ERR_TYPE_BUS,
+	ERR_TYPE_MS,
+	N_ERR_TYPES
+};
+
+static enum err_types cper_get_err_type(const guid_t *err_type)
+{
+	if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_CACHE))
+		return ERR_TYPE_CACHE;
+	else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_TLB))
+		return ERR_TYPE_TLB;
+	else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_BUS))
+		return ERR_TYPE_BUS;
+	else if (guid_equal(err_type, &INFO_ERR_STRUCT_TYPE_MS))
+		return ERR_TYPE_MS;
+	else
+		return N_ERR_TYPES;
+}
+
 void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc)
 {
 	int i;
 	struct cper_ia_err_info *err_info;
 	char newpfx[64];
+	u8 err_type;
 
 	if (proc->validation_bits & VALID_LAPIC_ID)
 		printk("%sLocal APIC_ID: 0x%llx\n", pfx, proc->lapic_id);
@@ -38,8 +74,15 @@ void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc)
 	for (i = 0; i < VALID_PROC_ERR_INFO_NUM(proc->validation_bits); i++) {
 		printk("%sError Information Structure %d:\n", pfx, i);
 
-		printk("%sError Structure Type: %pUl\n", newpfx,
-		       &err_info->err_type);
+		err_type = cper_get_err_type(&err_info->err_type);
+		printk("%sError Structure Type: %s\n", newpfx,
+		       err_type < ARRAY_SIZE(cper_proc_error_type_strs) ?
+		       cper_proc_error_type_strs[err_type] : "unknown");
+
+		if (err_type >= N_ERR_TYPES) {
+			printk("%sError Structure Type: %pUl\n", newpfx,
+			       &err_info->err_type);
+		}
 
 		if (err_info->validation_bits & INFO_VALID_CHECK_INFO) {
 			printk("%sCheck Information: 0x%016llx\n", newpfx,
-- 
2.17.0