[PATCH v3] powerpc/papr_scm: Implement support for H_SCM_FLUSH hcall

Michael Ellerman ellerman at au1.ibm.com
Wed Mar 31 21:20:36 AEDT 2021


"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> writes:
> Shivaprasad G Bhat <sbhat at linux.ibm.com> writes:
>
>> Add support for ND_REGION_ASYNC capability if the device tree
>> indicates 'ibm,hcall-flush-required' property in the NVDIMM node.
>> Flush is done by issuing H_SCM_FLUSH hcall to the hypervisor.
>>
>> If the flush request failed, the hypervisor is expected to
>> to reflect the problem in the subsequent nvdimm H_SCM_HEALTH call.
>>
>> This patch prevents mmap of namespaces with MAP_SYNC flag if the
>> nvdimm requires an explicit flush[1].
>>
>> References:
>> [1] https://github.com/avocado-framework-tests/avocado-misc-tests/blob/master/memory/ndctl.py.data/map_sync.c
>
>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

Do we need an ack from nvdimm folks on this?

Or is it entirely powerpc internal (seems like it from the diffstat)?

cheers


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