Le 11/02/2018 à 18:10, Vaibhav Jain a écrit :
Thanks for reviewing the patch Christophe,
christophe lombard <clomb...@linux.vnet.ibm.com> writes:
+bool cxl_enable_psltrace = true;
+module_param_named(enable_psltrace, cxl_enable_psltrace, bool, 0600);
+MODULE_PARM_DESC(enable_psltrace, "Set PSL traces on probe. default: on");
+
I am not too agree to add a new parameter. This can cause doubts.
PSL team has confirmed that enabling traces has no impact.
Do you see any reason to disable the traces ?
Traces on PSL follow a 'set and fetch' model. So once the trace buffer for
a specific array is full it will stop and switch to 'FIN' state and at
that point we need to fetch the trace-data and reinit the array to
re-arm it.
There might be some circumstances where this model may lead to confusion
specifically when AFU developers assume that the trace arrays are
already armed and dont re-arm it causing miss of trace data.
So this module param is a compromise to keep the old behaviour of traces
array intact where in the arming/disarming of the trace arrays is
controlled completely by userspace tooling and not by cxl.
and about P8 ? This new parameter is only useful for P9. It will be
confusing.
