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d0cf9b561c
kernel_optimize_test/arch/powerpc
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Alistair Popple d0cf9b561c 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: 1ab66d1fba ("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>
2018-04-24 09:46:57 +10:00
..
boot powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
configs
crypto
include powerpc/powernv/npu: Prevent overwriting of pnv_npu2_init_contex() callback parameters 2018-04-24 09:46:57 +10:00
kernel powerpc/kvm: Fix lockups when running KVM guests on Power8 2018-04-19 16:22:20 +10:00
kvm powerpc fixes for 4.17 #2 2018-04-15 11:57:12 -07:00
lib powerpc/lib: Fix off-by-one in alternate feature patching 2018-04-17 00:37:48 +10:00
math-emu
mm powerpc/mm: Flush cache on memory hot(un)plug 2018-04-24 09:46:56 +10:00
net
oprofile
perf powerpc updates for 4.17 2018-04-07 12:08:19 -07:00
platforms powerpc/powernv/npu: Do a PID GPU TLB flush when invalidating a large address range 2018-04-24 09:46:57 +10:00
purgatory
sysdev powerpc/xive: Fix trying to "push" an already active pool VP 2018-04-19 00:49:45 +10:00
tools
xmon Merge branch 'topic/paca' into next 2018-03-31 09:09:36 +11:00
Kconfig kexec_file: make use of purgatory optional 2018-04-13 17:10:27 -07:00
Kconfig.debug
Makefile powerpc/64s: Add POWER9 CPU type selection 2018-04-01 22:15:32 +10:00
Makefile.postlink