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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, linux-nvdimm <linux-nvdimm@lists.01.org>,
	linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.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
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WARNING: multiple messages have this Message-ID (diff)
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

WARNING: multiple messages have this Message-ID (diff)
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, linux-nvdimm <linux-nvdimm@lists.01.org>,
	linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org
Subject: Re: [RFC PATCH] powerpc/papr_scm: Implement scm async flush
Date: Tue, 01 Dec 2020 13:09:36 +0000	[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

  reply	other threads:[~2020-12-01 12:57 UTC|newest]

Thread overview: 12+ 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 12:18 ` Shivaprasad G Bhat
2020-12-01 12:18 ` Shivaprasad G Bhat
2020-12-01 12:47 ` Pankaj Gupta
2020-12-01 12:47   ` Pankaj Gupta
2020-12-01 12:47   ` Pankaj Gupta
2020-12-01 12:57   ` Aneesh Kumar K.V [this message]
2020-12-01 13:09     ` Aneesh Kumar K.V
2020-12-01 12:57     ` Aneesh Kumar K.V
2020-12-01 13:02     ` Pankaj Gupta
2020-12-01 13:02       ` Pankaj Gupta
2020-12-01 13:02       ` Pankaj Gupta

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