core/mce: add support for decoding and handling machine checks

This provides an initial facility to decode machine checks into
human readable strings, plus a minimum amount of metadata that
a handler has to understand in order to deal with the machine
check.

For now this is only used by skiboot to make MCE reporting nicer,
and an ERAT flush recovery attempt which is more about code
coverage than really being helpful.

  ***********************************************
  Fatal MCE at 00000000300c9c0c   .memcmp+0x3c  MSR 9000000000141002
  Cause: instruction fetch TLB multi-hit error
  Effective address: 0x00000000300c9c0c
  ...

The intention is to subsequently provide an OPAL API with this
information that will enable an OS to implement a machine
independent OPAL machine check driver.

The code and data tables are derived from Linux code that I wrote,
so relicensing is okay.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/include/ras.h b/include/ras.h
new file mode 100644
index 0000000..d0faaee
--- /dev/null
+++ b/include/ras.h
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: Apache-2.0
+/* Copyright 2020 IBM Corp. */
+
+#ifndef __RAS_H
+#define __RAS_H
+
+#include <compiler.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <errno.h>
+#include <bitutils.h>
+#include <types.h>
+
+#include <ccan/container_of/container_of.h>
+#include <ccan/list/list.h>
+#include <ccan/short_types/short_types.h>
+#include <ccan/build_assert/build_assert.h>
+#include <ccan/array_size/array_size.h>
+#include <ccan/endian/endian.h>
+#include <ccan/str/str.h>
+
+#include <processor.h>
+
+#define MCE_NO_ERROR			0x0001
+#define MCE_UNKNOWN			0x0002
+#define MCE_INSNFETCH			0x0004
+#define MCE_LOADSTORE			0x0008
+#define MCE_TABLE_WALK			0x0010
+#define MCE_IMPRECISE			0x0020
+#define MCE_MEMORY_ERROR		0x0040
+#define MCE_SLB_ERROR			0x0080
+#define MCE_ERAT_ERROR			0x0100
+#define MCE_TLB_ERROR			0x0200
+#define MCE_TLBIE_ERROR			0x0400
+#define MCE_INVOLVED_EA			0x0800
+#define MCE_INVOLVED_PA			0x1000
+
+void decode_mce(uint64_t srr0, uint64_t srr1,
+		uint32_t dsisr, uint64_t dar,
+		uint64_t *type, const char **error_str,
+		uint64_t *address);
+
+#endif /* __RAS_H */