** Changed in: linux (Ubuntu Zesty)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1706141
Title:
[ARM64] config EDAC_GHES=y depends on EDAC_MM_EDAC=y
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Zesty:
Fix Committed
Bug description:
[Impact]
In configs Zesty and Artful, EDAC_MM_EDAC is set to =m, this disables
EDAC_GHES. Customers using RAS on ARM64 may want this functionality.
According to RAS expert at QTI. EDAC_GHES is essential for ARMv8.0
Server systems, as it enables firmware-first error handling of memory
and CPU errors. Due to a lack of standard RAS architecture (or machine
check architecture equivalent) on ARMv8.0 systems, APEI/GHES is the
only mechanism available for reporting hardware errors (e.g. memory
and CPU errors). This enables reporting of hardware errors, and also
helps enable memory fault recovery mechanisms to extend the life of
the system by offlining pages when recoverable uncorrected errors are
encountered. Note that other ARM vendors will be going in this
direction for hardware error handling.
[Test]
Test kernel available in
https://launchpad.net/~centriq-team/+archive/ubuntu/lp1706141
Boot the kernel and check dmesg for the following:
$ dmesg | grep -i -E "edac|hest|ghes"
[ 0.000000] ACPI: HEST 0x0000000009160000 000288 (v01 QCOM QDF2400
00000001 INTL 20150515)
[ 0.620278] HEST: Table parsing has been initialized.
[ 4.178298] EDAC MC: Ver: 3.0.0
[ 5.664499] ghes_edac: This EDAC driver relies on BIOS to enumerate memory
and get error reports.
[ 5.673371] ghes_edac: Unfortunately, not all BIOSes reflect the memory
layout correctly.
[ 5.681542] ghes_edac: So, the end result of using this driver varies from
vendor to vendor.
[ 5.689972] ghes_edac: If you find incorrect reports, please contact your
hardware vendor
[ 5.698142] ghes_edac: to correct its BIOS.
[ 5.702320] ghes_edac: This system has 12 DIMM sockets.
[ 5.707717] EDAC MC0: Giving out device to module ghes_edac.c controller
ghes_edac: DEV ghes (INTERRUPT)
[ 5.717264] EDAC MC1: Giving out device to module ghes_edac.c controller
ghes_edac: DEV ghes (INTERRUPT)
[ 5.726806] EDAC MC2: Giving out device to module ghes_edac.c controller
ghes_edac: DEV ghes (INTERRUPT)
[ 5.736344] EDAC MC3: Giving out device to module ghes_edac.c controller
ghes_edac: DEV ghes (INTERRUPT)
[ 5.745883] EDAC MC4: Giving out device to module ghes_edac.c controller
ghes_edac: DEV ghes (INTERRUPT)
[ 5.755469] GHES: APEI firmware first mode is enabled by APEI bit and WHEA
_OSC.
[Fix]
1. Apply RAS patch series submitted for SRU in Bug #1696570
2. Set config option EDAC_MM_EDAC=y for ARM64, this will automatically set
EDAC_GHES=y
3. Remove edac_core from
debian.master/abi/<ver>/arm64/generic.modules
[Regression Potential]
The config change is limited to ARM64 architecture, and does not impact any
other architecture. Potential for regressions is low.
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