Hi guys,
On 2020-05-28 14:16, Sai Prakash Ranjan wrote:
Hi folks,
I was trying to enable SMMU translation for coresight TMC ETR component via "iommus" property on SC7180 SoC. And on enabling the trace, I observe random softlockups everytime. For enabling trace, I just select ETR as the sink and ETM as the source via sysfs and immediately start seeing lockups. I have looked from the hardware point of view and there is no errata as such and it works fine on downstream kernel which is very old - 4.14 kernel. This is reproducible even with KASAN disabled as well. Also I have dumped other CPU stacks as well during softlockup via adding dump_stack in ipi_cpu_stop and and no interesting logs there as other cpus are idle.
As an update, this turned out to be due to firmware misconfiguration.
Thanks, Sai