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| author |   Anju T Sudhakar <anju@linux.vnet.ibm.com> | 2020-03-13 11:22:38 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-04-03 00:09:58 +1100 |
| commit | 4bdd39460b5f57d4f165c4a05b22e66eb3a490ae (patch) | |
| tree | 9bb3acae471d388348459679d43adafbbac7e938 /arch/powerpc | |
| parent | powerpc/perf: Implement a global lock to avoid races between trace, core and thread imc events. (diff) | |
| download | wireguard-linux-4bdd39460b5f57d4f165c4a05b22e66eb3a490ae.tar.xz wireguard-linux-4bdd39460b5f57d4f165c4a05b22e66eb3a490ae.zip | |
powerpc/powernv: Re-enable imc trace-mode in kernel
commit <249fad734a25> ""powerpc/perf: Disable trace_imc pmu"
disables IMC(In-Memory Collection) trace-mode in kernel, since frequent
mode switching between accumulation mode and trace mode via the spr LDBAR
in the hardware can trigger a checkstop(system crash).
Patch to re-enable imc-trace mode in kernel.
The previous patch(1/2) in this series will address the mode switching issue
by implementing a global lock, and will restrict the usage of
accumulation and trace-mode at a time.
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200313055238.8656-2-anju@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-imc.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c index 968b9a4d1cd9..7824cc364bc4 100644 --- a/arch/powerpc/platforms/powernv/opal-imc.c +++ b/arch/powerpc/platforms/powernv/opal-imc.c @@ -268,14 +268,7 @@ static int opal_imc_counters_probe(struct platform_device *pdev) domain = IMC_DOMAIN_THREAD; break; case IMC_TYPE_TRACE: - /* - * FIXME. Using trace_imc events to monitor application - * or KVM thread performance can cause a checkstop - * (system crash). - * Disable it for now. - */ - pr_info_once("IMC: disabling trace_imc PMU\n"); - domain = -1; + domain = IMC_DOMAIN_TRACE; break; default: pr_warn("IMC Unknown Device type \n"); |