Le 24/11/2017 à 14:02, Benjamin Herrenschmidt a écrit :

On Fri, 2017-11-24 at 11:14 +0100, christophe lombard wrote:

quoted

To my knowledge, there is no property (or similar), somewhere, that
indicating that the TIDR is supported or not.
For the time being, if I am not wrong, the only check we have, is
this condition in the function set_thread_tidr(struct task_struct *t):

         if (!cpu_has_feature(CPU_FTR_ARCH_300))
                 return -EINVAL;


Christophe

Then we need to fix that

Ben.

You are right. We will insert a checking in the cxl driver to allow
updating the TIDR if a P9 is present. This will be in the patch V2.
Thanks

Christophe