diff options
| author |   Madhavan Srinivasan <maddy@linux.vnet.ibm.com> | 2017-07-11 16:27:49 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-07-11 22:19:36 +1000 |
| commit | 20dd4c624d25156d5ec3345bbb690b98175ef879 (patch) | |
| tree | 8e72695d0d3e3c5198851d4779f6dc1cbfaa9343 /arch | |
| parent | powerpc/asm: Mark cr0 as clobbered in mftb() (diff) | |
| download | wireguard-linux-20dd4c624d25156d5ec3345bbb690b98175ef879.tar.xz wireguard-linux-20dd4c624d25156d5ec3345bbb690b98175ef879.zip | |
powerpc/perf: Fix SDAR_MODE value for continous sampling on Power9
In case of continous sampling (non-marked), the code currently
sets MMCRA[SDAR_MODE] to 0b01 (Update on TLB miss) for Power9 DD1.
On DD2 and later it copies the sdar_mode value from the event code,
which for most events is 0b00 (No updates).
However we must set a non-zero value for SDAR_MODE when doing
continuous sampling, so honor the event code, unless it's zero, in
which case we use use 0b01 (Update on TLB miss).
Fixes: 78b4416aa249 ("powerpc/perf: Handle sdar_mode for marked event in power9")
Cc: stable@vger.kernel.org # v4.11+
Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/perf/isa207-common.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/powerpc/perf/isa207-common.c b/arch/powerpc/perf/isa207-common.c index 8125160be7bc..3f3aa9a7063a 100644 --- a/arch/powerpc/perf/isa207-common.c +++ b/arch/powerpc/perf/isa207-common.c @@ -90,13 +90,15 @@ static void mmcra_sdar_mode(u64 event, unsigned long *mmcra) * MMCRA[SDAR_MODE] will be set to 0b01 * For rest * MMCRA[SDAR_MODE] will be set from event code. + * If sdar_mode from event is zero, default to 0b01. Hardware + * requires that we set a non-zero value. */ if (cpu_has_feature(CPU_FTR_ARCH_300)) { if (is_event_marked(event) || (*mmcra & MMCRA_SAMPLE_ENABLE)) *mmcra &= MMCRA_SDAR_MODE_NO_UPDATES; - else if (!cpu_has_feature(CPU_FTR_POWER9_DD1)) + else if (!cpu_has_feature(CPU_FTR_POWER9_DD1) && p9_SDAR_MODE(event)) *mmcra |= p9_SDAR_MODE(event) << MMCRA_SDAR_MODE_SHIFT; - else if (cpu_has_feature(CPU_FTR_POWER9_DD1)) + else *mmcra |= MMCRA_SDAR_MODE_TLB; } else *mmcra |= MMCRA_SDAR_MODE_TLB; |