# git rev-parse -q --verify 90a9b102eddf6a3f987d15f4454e26a2532c1c98^{commit}
90a9b102eddf6a3f987d15f4454e26a2532c1c98
already have revision, skipping fetch
# git checkout -q -f -B kisskb 90a9b102eddf6a3f987d15f4454e26a2532c1c98
# git clean -qxdf
# < git log -1
# commit 90a9b102eddf6a3f987d15f4454e26a2532c1c98
# Author: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
# Date:   Thu Aug 20 11:48:44 2020 +0530
# 
#     powerpc/pseries: Do not initiate shutdown when system is running on UPS
#     
#     As per PAPR we have to look for both EPOW sensor value and event
#     modifier to identify the type of event and take appropriate action.
#     
#     In LoPAPR v1.1 section 10.2.2 includes table 136 "EPOW Action Codes":
#     
#       SYSTEM_SHUTDOWN 3
#     
#       The system must be shut down. An EPOW-aware OS logs the EPOW error
#       log information, then schedules the system to be shut down to begin
#       after an OS defined delay internal (default is 10 minutes.)
#     
#     Then in section 10.3.2.2.8 there is table 146 "Platform Event Log
#     Format, Version 6, EPOW Section", which includes the "EPOW Event
#     Modifier":
#     
#       For EPOW sensor value = 3
#       0x01 = Normal system shutdown with no additional delay
#       0x02 = Loss of utility power, system is running on UPS/Battery
#       0x03 = Loss of system critical functions, system should be shutdown
#       0x04 = Ambient temperature too high
#       All other values = reserved
#     
#     We have a user space tool (rtas_errd) on LPAR to monitor for
#     EPOW_SHUTDOWN_ON_UPS. Once it gets an event it initiates shutdown
#     after predefined time. It also starts monitoring for any new EPOW
#     events. If it receives "Power restored" event before predefined time
#     it will cancel the shutdown. Otherwise after predefined time it will
#     shutdown the system.
#     
#     Commit 79872e35469b ("powerpc/pseries: All events of
#     EPOW_SYSTEM_SHUTDOWN must initiate shutdown") changed our handling of
#     the "on UPS/Battery" case, to immediately shutdown the system. This
#     breaks existing setups that rely on the userspace tool to delay
#     shutdown and let the system run on the UPS.
#     
#     Fixes: 79872e35469b ("powerpc/pseries: All events of EPOW_SYSTEM_SHUTDOWN must initiate shutdown")
#     Cc: stable@vger.kernel.org # v4.0+
#     Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
#     [mpe: Massage change log and add PAPR references]
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://lore.kernel.org/r/20200820061844.306460-1-hegdevasant@linux.vnet.ibm.com
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version
# < git log --format=%s --max-count=1 90a9b102eddf6a3f987d15f4454e26a2532c1c98
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# < make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  help
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  olddefconfig
# make -s -j 80 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc4.9 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-4.9.4-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_pseries_defconfig_powerpc-gcc4.9
# Build took: 0:03:00.361666