From 4bdd39460b5f57d4f165c4a05b22e66eb3a490ae Mon Sep 17 00:00:00 2001 From: Anju T Sudhakar Date: Fri, 13 Mar 2020 11:22:38 +0530 Subject: 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200313055238.8656-2-anju@linux.vnet.ibm.com --- arch/powerpc/platforms/powernv/opal-imc.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) (limited to 'arch/powerpc') 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"); -- cgit v1.2.3