efi: Decode IA32/X64 Processor Error Section

Recognize the IA32/X64 Processor Error Section.

Do the section decoding in a new "cper-x86.c" file and add this to the
Makefile depending on a new "UEFI_CPER_X86" config option.

Print the Local APIC ID and CPUID info from the Processor Error Record.

The "Processor Error Info" and "Processor Context" fields will be
decoded in following patches.

Based on UEFI 2.7 Table 252. Processor Error Record.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20180504060003.19618-5-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

5 files changed, 41 insertions, 0 deletions

diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
index 3098410abad8..781a4a337557 100644
--- a/drivers/firmware/efi/Kconfig
+++ b/drivers/firmware/efi/Kconfig
@@ -174,6 +174,11 @@ config UEFI_CPER_ARM
         depends on UEFI_CPER && ( ARM || ARM64 )
         default y
 
+config UEFI_CPER_X86
+        bool
+        depends on UEFI_CPER && X86
+        default y
+
 config EFI_DEV_PATH_PARSER
         bool
         depends on ACPI
diff --git a/drivers/firmware/efi/Makefile b/drivers/firmware/efi/Makefile
index cb805374f4bc..5f9f5039de50 100644
--- a/drivers/firmware/efi/Makefile
+++ b/drivers/firmware/efi/Makefile
@@ -31,3 +31,4 @@ obj-$(CONFIG_ARM)			+= $(arm-obj-y)
 obj-$(CONFIG_ARM64)                     += $(arm-obj-y)
 obj-$(CONFIG_EFI_CAPSULE_LOADER)        += capsule-loader.o
 obj-$(CONFIG_UEFI_CPER_ARM)             += cper-arm.o
+obj-$(CONFIG_UEFI_CPER_X86)             += cper-x86.o
diff --git a/drivers/firmware/efi/cper-x86.c b/drivers/firmware/efi/cper-x86.c
new file mode 100644
index 000000000000..863f0cd2a0ff
--- /dev/null
+++ b/drivers/firmware/efi/cper-x86.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018, Advanced Micro Devices, Inc.
+
+#include <linux/cper.h>
+
+/*
+ * We don't need a "CPER_IA" prefix since these are all locally defined.
+ * This will save us a lot of line space.
+ */
+#define VALID_LAPIC_ID                  BIT_ULL(0)
+#define VALID_CPUID_INFO                BIT_ULL(1)
+
+void cper_print_proc_ia(const char *pfx, const struct cper_sec_proc_ia *proc)
+{
+        if (proc->validation_bits & VALID_LAPIC_ID)
+                printk("%sLocal APIC_ID: 0x%llx\n", pfx, proc->lapic_id);
+
+        if (proc->validation_bits & VALID_CPUID_INFO) {
+                printk("%sCPUID Info:\n", pfx);
+                print_hex_dump(pfx, "", DUMP_PREFIX_OFFSET, 16, 4, proc->cpuid,
+                               sizeof(proc->cpuid), 0);
+        }
+}
diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
index ab21f1614007..3bf0dca378a6 100644
--- a/drivers/firmware/efi/cper.c
+++ b/drivers/firmware/efi/cper.c
@@ -468,6 +468,16 @@ cper_estatus_print_section(const char *pfx, struct acpi_hest_generic_data *gdata
                 else
                         goto err_section_too_small;
 #endif
+#if defined(CONFIG_UEFI_CPER_X86)
+        } else if (guid_equal(sec_type, &CPER_SEC_PROC_IA)) {
+                struct cper_sec_proc_ia *ia_err = acpi_hest_get_payload(gdata);
+
+                printk("%ssection_type: IA32/X64 processor error\n", newpfx);
+                if (gdata->error_data_length >= sizeof(*ia_err))
+                        cper_print_proc_ia(newpfx, ia_err);
+                else
+                        goto err_section_too_small;
+#endif
         } else {
                 const void *err = acpi_hest_get_payload(gdata);
 
diff --git a/include/linux/cper.h b/include/linux/cper.h
index 4b5f8459b403..9c703a0abe6e 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -551,5 +551,7 @@ const char *cper_mem_err_unpack(struct trace_seq *,
                                 struct cper_mem_err_compact *);
 void cper_print_proc_arm(const char *pfx,
                          const struct cper_sec_proc_arm *proc);
+void cper_print_proc_ia(const char *pfx,
+                        const struct cper_sec_proc_ia *proc);
 
 #endif