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There was always exactly one elog descriptor declared and initialized, but its
contents were being accessed through a pointer that was passed back and forth
between functions instead of being accessed directly. This made the code more
verbose than it needed to be and harder to follow. To address this the
descriptor type was eliminated, its contents were turned into individual
global variables, and various functions were adjusted to no longer take the
descriptor as an argument.
Similarly, the code was more verbose and complicated than it needed to be
because of several wrapper functions which wrapped a single line of code which
called an underlying function with particular arguments and were only used
once. This makes it harder to tell what the code is doing because the call to
the real function you may already be familiar with is obscured behind a
new function you've never seen before. It also adds one more text to the file
as a whole while providing at best a marginal benefit. Those functions were
removed and their callers now call their contents directly.
Built and booted on Link. Ran mosys eventlog list. Cleared the event log
and ran mosys eventlog list again. Added 2000 events and ran mosys eventlog
list. Cleared the log again and ran mosys eventlog list.
Change-Id: I4f5f6b9f4f508548077b7f5a92f4322db99e01ca
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/49310
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/4245
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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The elog driver's design was a bit more elaborate than it really needed to be
since it no longer had to keep track of multiple copies of the log in flash
and also in memory. This change streamlines it by removing unnecessary
compartmentalization of some bits of code, and some variables which tracked
the last entry added which were never used.
Built and booted on Link. Ran mosys eventlog list. Added 2000 events to
the event log and ran mosys eventlog list again. Cleared the log by echoing 1
into /sys/firmware/gsmi/clear_eventlog and ran mosys eventlog list.
Change-Id: I7d4cdebf2f5b1f6bb1fc70e65eca18f71b124b18
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/49309
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/4244
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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The event log driver keeps two copies of the event log in memory, one to
take the place of the historically memory mapped image of flash which is now
read and written manually, and one originally intended to be an in memory
cache of flash. Since both are now just copies in memory, there's no value in
having them both and keeping them in sync.
Built and booted on Link. Ran mosys eventlog list. Added 2000 events to
the log and ran mosys eventlog list again. Cleared the log by echoing a 1 into
/sys/firmware/gsmi/clear_eventlog and ran mosys eventlog list again.
Change-Id: Ibed62a10c78884849726aa15ec795ab2914afc35
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/49306
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/4241
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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The header is at the start of the log. There's no reason to either keep a
seperate pointer to it, or to keep a copy of it in some other bit of memory.
Built and booted on Link and used 'mosys eventlog list' to list the
contents of the log. Ran
for x in $(seq 1 2000); do
cat elog.event.kernel_clean > /sys/firmware/gsmi/append_to_eventlog;
done
And ran mosys eventlog list again to verify that the log had been shrunk
correctly.
Change-Id: I2afcd52c0ce5bbb662ac56f2895cdbea28d5c2ce
Signed-off-by: Gabe Black <gabeblack@google.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/49304
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Commit-Queue: Gabe Black <gabeblack@chromium.org>
Tested-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/4239
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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If the event log is stored in flash that is not memory
mapped then it must use the SPI controller to read from
the flash device instead of relying on memory accesses.
In addition a new CBMEM ID is added to keep an resident
copy of the ELOG around if needed. The use of CBMEM for
this is guarded by a new CONFIG_ELOG_CBMEM config option.
This CBMEM buffer is created and filled late in the process
when the SMBIOS table is being created because CBMEM is
not functional when ELOG is first initialized.
The downside to using CBMEM is that events added via the
SMI handler at runtime are not reflected in the CBMEM copy
because I don't want to let the SMM handler write to memory
outside the TSEG region.
In reality the only time we add runtime events is at kernel
shutdown so the impact is limited.
Test:
1) Test with CONFIG_ELOG_CBMEM enabled to ensure the event
log is operational and SMBIOS points to address in CBMEM.
The test should involve at least on reboot to ensure that the
kernel is able to write events as well.
> mosys -l smbios info log | grep ^address
address | 0xacedd000
> mosys eventlog list
0 | 2012-10-10 14:02:46 | Log area cleared | 4096
1 | 2012-10-10 14:02:46 | System boot | 478
2 | 2012-10-10 14:02:46 | System Reset
3 | 2012-10-10 14:03:33 | Kernel Event | Clean Shutdown
4 | 2012-10-10 14:03:34 | System boot | 479
5 | 2012-10-10 14:03:34 | System Reset
2) Test with CONFIG_ELOG_CBMEM disabled to ensure the event
log is operational and SMBIOS points to memory mapped flash.
The test should involve at least on reboot to ensure that the
kernel is able to write events as well.
> mosys -l smbios info log | grep ^address
address | 0xffbf0000
> mosys eventlog list
0 | 2012-10-10 14:33:17 | Log area cleared | 4096
1 | 2012-10-10 14:33:18 | System boot | 480
2 | 2012-10-10 14:33:18 | System Reset
3 | 2012-10-10 14:33:35 | Kernel Event | Clean Shutdown
4 | 2012-10-10 14:33:36 | System boot | 481
5 | 2012-10-10 14:33:36 | System Reset
Change-Id: I87755d5291ce209c1e647792227c433dc966615d
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1776
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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This standared SMBIOS 0able describes the location and format
of the event log to the OS and applications. In this case the
pointer is a 32bit physical address pointer to the log in
memory mapped flash.
Look for SMBIOS type15 entry with 'dmidecode -t 15'
Handle 0x0004, DMI type 15, 23 bytes
System Event Log
Area Length: 4095 bytes
Header Start Offset: 0x0000
Header Length: 8 bytes
Data Start Offset: 0x0008
Access Method: Memory-mapped physical 32-bit address
Access Address: 0xFFB6F000
Status: Valid, Not Full
Change Token: 0x00000000
Header Format: OEM-specific
Supported Log Type Descriptors: 0
Change-Id: I1e7729e604000f197e26e69991a2867e869197a6
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: http://review.coreboot.org/1314
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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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>
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