# git rev-parse -q --verify 1e072bee33d09c62a975faab919a5be92d9538ab^{commit}
1e072bee33d09c62a975faab919a5be92d9538ab
already have revision, skipping fetch
# git checkout -q -f -B kisskb 1e072bee33d09c62a975faab919a5be92d9538ab
# git clean -qxdf
# < git log -1
# commit 1e072bee33d09c62a975faab919a5be92d9538ab
# Author: Alistair Popple <alistair@popple.id.au>
# Date:   Tue Apr 17 19:11:28 2018 +1000
# 
#     powerpc/powernv/npu: Do a PID GPU TLB flush when invalidating a large address range
#     
#     The NPU has a limited number of address translation shootdown (ATSD)
#     registers and the GPU has limited bandwidth to process ATSDs. This can
#     result in contention of ATSD registers leading to soft lockups on some
#     threads, particularly when invalidating a large address range in
#     pnv_npu2_mn_invalidate_range().
#     
#     At some threshold it becomes more efficient to flush the entire GPU
#     TLB for the given MM context (PID) than individually flushing each
#     address in the range. This patch will result in ranges greater than
#     2MB being converted from 32+ ATSDs into a single ATSD which will flush
#     the TLB for the given PID on each GPU.
#     
#     Fixes: 1ab66d1fbada ("powerpc/powernv: Introduce address translation services for Nvlink2")
#     Cc: stable@vger.kernel.org # v4.12+
#     Signed-off-by: Alistair Popple <alistair@popple.id.au>
#     Acked-by: Balbir Singh <bsingharora@gmail.com>
#     Tested-by: Balbir Singh <bsingharora@gmail.com>
#     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 1e072bee33d09c62a975faab919a5be92d9538ab
# < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+POWERNV=n_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  pseries_defconfig
# Added to kconfig CONFIG_PPC_POWERNV=n
# yes \n | make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+POWERNV=n_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 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_pseries_defconfig+POWERNV=n_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_pseries_defconfig+POWERNV=n_powerpc-5.3
# Build took: 0:02:21.516145