ELOG: Add support for flash based event log

This is based around the SMBIOS event log specification but
expanded with OEM event types to support more specific and
relevant system events.

It requires flash storage and a minimum 4K block (or flash block
size) that should be allocated in the FMAP.

A copy of the event log is maintained in memory for convenience
and speed and the in-memory copy is written to flash at specific
points.

The log is automatically shunk when it reaches a configurable
full threshold in order to not get stuck with a full log that
needs OS help to clear.

ELOG implements the specification published here:
http://code.google.com/p/firmware-event-log/wiki/FirmwareEventLogDesign

And is similar to what we use in other firmware at Google.
This implementation does not support double-buffered flash
regions.  This is done because speed is valued over the log
reliability and it keeps the code simpler for the first version.

This is a large commit and by itself it just provides a new
driver that is made available to coreboot.  Without additional
patches it is not very useful, but the end result is an event
log that will contain entries like this:

171 | 2012-06-23 16:02:55 | System boot | 285
172 | 2012-06-23 16:02:55 | EC Event | Power Button
173 | 2012-06-23 16:02:55 | SUS Power Fail
174 | 2012-06-23 16:02:55 | System Reset
175 | 2012-06-23 16:02:55 | ACPI Wake | S5

Change-Id: I985524c67f525c8a268eccbd856c1a4c2a426889
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1311
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 119 insertions, 0 deletions

diff --git a/src/include/elog.h b/src/include/elog.h
new file mode 100644
index 0000000000..c6599a249c
--- /dev/null
+++ b/src/include/elog.h
@@ -0,0 +1,119 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
+ */
+
+#ifndef ELOG_H_
+#define ELOG_H_
+
+#if CONFIG_ELOG
+
+/* SMI command code for GSMI event logging */
+#define ELOG_GSMI_APM_CNT                 0xEF
+
+#define MAX_EVENT_SIZE                    0x7F
+
+/* End of log */
+#define ELOG_TYPE_EOL                     0xFF
+
+/*
+ * Standard SMBIOS event log types below 0x80
+ */
+#define ELOG_TYPE_UNDEFINED_EVENT         0x00
+#define ELOG_TYPE_SINGLE_BIT_ECC_MEM_ERR  0x01
+#define ELOG_TYPE_MULTI_BIT_ECC_MEM_ERR   0x02
+#define ELOG_TYPE_MEM_PARITY_ERR          0x03
+#define ELOG_TYPE_BUS_TIMEOUT             0x04
+#define ELOG_TYPE_IO_CHECK                0x05
+#define ELOG_TYPE_SW_NMI                  0x06
+#define ELOG_TYPE_POST_MEM_RESIZE         0x07
+#define ELOG_TYPE_POST_ERR                0x08
+#define ELOG_TYPE_PCI_PERR                0x09
+#define ELOG_TYPE_PCI_SERR                0x0A
+#define ELOG_TYPE_CPU_FAIL                0x0B
+#define ELOG_TYPE_EISA_TIMEOUT            0x0C
+#define ELOG_TYPE_CORRECTABLE_MEMLOG_DIS  0x0D
+#define ELOG_TYPE_LOG_DISABLED            0x0E
+#define ELOG_TYPE_UNDEFINED_EVENT2        0x0F
+#define ELOG_TYPE_SYS_LIMIT_EXCEED        0x10
+#define ELOG_TYPE_ASYNC_HW_TIMER_EXPIRED  0x11
+#define ELOG_TYPE_SYS_CONFIG_INFO         0x12
+#define ELOG_TYPE_HDD_INFO                0x13
+#define ELOG_TYPE_SYS_RECONFIG            0x14
+#define ELOG_TYPE_CPU_ERROR               0x15
+#define ELOG_TYPE_LOG_CLEAR               0x16
+#define ELOG_TYPE_BOOT                    0x17
+
+/*
+ * Extended defined OEM event types start at 0x80
+ */
+
+/* OS/kernel events */
+#define ELOG_TYPE_OS_EVENT                0x81
+
+/* Last event from coreboot */
+#define ELOG_TYPE_OS_BOOT                 0x90
+
+/* Embedded controller event */
+#define ELOG_TYPE_EC_EVENT                0x91
+
+/* Power */
+#define ELOG_TYPE_POWER_FAIL              0x92
+#define ELOG_TYPE_SUS_POWER_FAIL          0x93
+#define ELOG_TYPE_PWROK_FAIL              0x94
+#define ELOG_TYPE_SYS_PWROK_FAIL          0x95
+#define ELOG_TYPE_POWER_ON                0x96
+#define ELOG_TYPE_POWER_BUTTON            0x97
+#define ELOG_TYPE_POWER_BUTTON_OVERRIDE   0x98
+
+/* Reset */
+#define ELOG_TYPE_RESET_BUTTON            0x99
+#define ELOG_TYPE_SYSTEM_RESET            0x9a
+#define ELOG_TYPE_RTC_RESET               0x9b
+#define ELOG_TYPE_TCO_RESET               0x9c
+
+/* Sleep/Wake */
+#define ELOG_TYPE_ACPI_ENTER              0x9d
+#define ELOG_TYPE_ACPI_WAKE               0x9e
+#define ELOG_TYPE_WAKE_SOURCE             0x9f
+#define  ELOG_WAKE_SOURCE_PCIE             0x00
+#define  ELOG_WAKE_SOURCE_PME              0x01
+#define  ELOG_WAKE_SOURCE_PME_INTERNAL     0x02
+#define  ELOG_WAKE_SOURCE_RTC              0x03
+#define  ELOG_WAKE_SOURCE_GPIO             0x04
+#define  ELOG_WAKE_SOURCE_SMBUS            0x05
+struct elog_event_data_wake {
+	u8 source;
+	u32 instance;
+} __attribute__ ((packed));
+
+/* Chrome OS related events */
+#define ELOG_TYPE_CROS_DEVELOPER_MODE     0xa0
+#define ELOG_TYPE_CROS_RECOVERY_MODE      0xa1
+
+extern int elog_init(void);
+extern int elog_clear(void);
+extern void elog_add_event_raw(u8 event_type, void *data, u8 data_size);
+extern void elog_add_event(u8 event_type);
+extern void elog_add_event_byte(u8 event_type, u8 data);
+extern void elog_add_event_word(u8 event_type, u16 data);
+extern void elog_add_event_dword(u8 event_type, u32 data);
+extern void elog_add_event_wake(u8 source, u32 instance);
+
+#endif /* !CONFIG_ELOG */
+
+#endif /* ELOG_H_ */