# git rev-parse -q --verify d0cf9b561ca97d5245bb9e0c4774b7fadd897d67^{commit}
d0cf9b561ca97d5245bb9e0c4774b7fadd897d67
already have revision, skipping fetch
# git checkout -q -f -B kisskb d0cf9b561ca97d5245bb9e0c4774b7fadd897d67
# git clean -qxdf
# < git log -1
# commit d0cf9b561ca97d5245bb9e0c4774b7fadd897d67
# 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 d0cf9b561ca97d5245bb9e0c4774b7fadd897d67
# < make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  40x/ep405_defconfig
# make -s -j 10 ARCH=powerpc O=/kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-  
arch/powerpc/boot/ep405.dtb: Warning (pci_bridge): /plb/pci@ec000000: missing bus-range for PCI bridge
arch/powerpc/boot/ep405.dtb: Warning (pci_device_bus_num): Failed prerequisite 'pci_bridge'
INFO: Uncompressed kernel (size 0x504120) overlaps the address of the wrapper(0x400000)
INFO: Fixing the link_address of wrapper to (0x600000)
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_40x_ep405_defconfig_powerpc-5.3
# Build took: 0:01:09.480682