# git rev-parse -q --verify 13a83eac373c49c0a081cbcd137e79210fe78acd^{commit}
13a83eac373c49c0a081cbcd137e79210fe78acd
already have revision, skipping fetch
# git checkout -q -f -B kisskb 13a83eac373c49c0a081cbcd137e79210fe78acd
# git clean -qxdf
# < git log -1
# commit 13a83eac373c49c0a081cbcd137e79210fe78acd
# Author: Michael Neuling <mikey@neuling.org>
# Date:   Wed Apr 11 13:37:58 2018 +1000
# 
#     powerpc/eeh: Fix enabling bridge MMIO windows
#     
#     On boot we save the configuration space of PCIe bridges. We do this so
#     when we get an EEH event and everything gets reset that we can restore
#     them.
#     
#     Unfortunately we save this state before we've enabled the MMIO space
#     on the bridges. Hence if we have to reset the bridge when we come back
#     MMIO is not enabled and we end up taking an PE freeze when the driver
#     starts accessing again.
#     
#     This patch forces the memory/MMIO and bus mastering on when restoring
#     bridges on EEH. Ideally we'd do this correctly by saving the
#     configuration space writes later, but that will have to come later in
#     a larger EEH rewrite. For now we have this simple fix.
#     
#     The original bug can be triggered on a boston machine by doing:
#       echo 0x8000000000000000 > /sys/kernel/debug/powerpc/PCI0001/err_injct_outbound
#     On boston, this PHB has a PCIe switch on it.  Without this patch,
#     you'll see two EEH events, 1 expected and 1 the failure we are fixing
#     here. The second EEH event causes the anything under the PHB to
#     disappear (i.e. the i40e eth).
#     
#     With this patch, only 1 EEH event occurs and devices properly recover.
#     
#     Fixes: 652defed4875 ("powerpc/eeh: Check PCIe link after reset")
#     Cc: stable@vger.kernel.org # v3.11+
#     Reported-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
#     Signed-off-by: Michael Neuling <mikey@neuling.org>
#     Acked-by: Russell Currey <ruscur@russell.cc>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
# < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version
# < git log --format=%s --max-count=1 13a83eac373c49c0a081cbcd137e79210fe78acd
# < make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_TM_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  ppc64_defconfig
# Added to kconfig CONFIG_PPC_TRANSACTIONAL_MEM=n
# yes \n | make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_TM_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  oldconfig
yes: standard output: Broken pipe
yes: write error
# make -s -j 40 ARCH=powerpc O=/kisskb/build/powerpc-fixes_ppc64_defconfig+NO_TM_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_ppc64_defconfig+NO_TM_powerpc-5.3
# Build took: 0:01:14.948168