[RFC PATCH] powerpc/papr_scm: Implement scm async flush

[Aneesh Kumar K.V]

On 12/1/20 6:17 PM, Pankaj Gupta wrote:
>> Tha patch implements SCM async-flush hcall and sets the
>> ND_REGION_ASYNC capability when the platform device tree
>> has "ibm,async-flush-required" set.
> 
> So, you are reusing the existing ND_REGION_ASYNC flag for the
> hypercall based async flush with device tree discovery?
> 
> Out of curiosity, does virtio based flush work in ppc? Was just thinking
> if we can reuse virtio based flush present in virtio-pmem? Or anything
> else we are trying to achieve here?
> 


Not with PAPR based pmem driver papr_scm.ko. The devices there are 
considered platform device and we use hypercalls to configure the 
device. On similar fashion we are now using hypercall to flush the host 
based caches.

-aneesh