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From: Michael Ellerman <ellerman@au1.ibm.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
	Shivaprasad G Bhat <sbhat@linux.ibm.com>,
	sbhat@linux.vnet.ibm.com, linuxppc-dev@lists.ozlabs.org,
	kvm-ppc@vger.kernel.org, linux-nvdimm@lists.01.org
Cc: vaibhav@linux.ibm.com, linux-doc@vger.kernel.org
Subject: Re: [PATCH v3] powerpc/papr_scm: Implement support for H_SCM_FLUSH hcall
Date: Wed, 31 Mar 2021 21:20:36 +1100
Message-ID: <87zgyjwrnv.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <87mtul6xzj.fsf@linux.ibm.com>

"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes:
> Shivaprasad G Bhat <sbhat@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@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

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-29 17:36 Shivaprasad G Bhat
2021-03-30  4:56 ` Aneesh Kumar K.V
2021-03-31 10:20   ` Michael Ellerman [this message]
2021-04-05  3:47     ` Aneesh Kumar K.V
2021-04-13 14:13 ` Vaibhav Jain
2021-04-14  5:20   ` Aneesh Kumar K.V
2021-04-14  9:21     ` Vaibhav Jain
2021-04-19  3:59 ` Michael Ellerman

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