From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
Shivaprasad G Bhat <sbhat@linux.ibm.com>
Cc: ellerman@au1.ibm.com, linuxppc-dev@lists.ozlabs.org,
kvm-ppc@vger.kernel.org, linux-nvdimm <linux-nvdimm@lists.01.org>
Subject: Re: [RFC PATCH] powerpc/papr_scm: Implement scm async flush
Date: Tue, 1 Dec 2020 18:27:36 +0530 [thread overview]
Message-ID: <20035bbc-a1e0-82fd-105d-999e1afff029@linux.ibm.com> (raw)
In-Reply-To: <CAM9Jb+iPV470063QYq145znYW8CmqjNgdL=q6=3JXUJJt+z5gw@mail.gmail.com>
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
next prev parent reply other threads:[~2020-12-01 13:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 12:18 [RFC PATCH] powerpc/papr_scm: Implement scm async flush Shivaprasad G Bhat
2020-12-01 12:47 ` Pankaj Gupta
2020-12-01 12:57 ` Aneesh Kumar K.V [this message]
2020-12-01 13:02 ` Pankaj Gupta
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