Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   "Alim Akhtar" <alim.akhtar@samsung.com>
To:     "'Avi Shchislowski'" <Avi.Shchislowski@wdc.com>,
        "'Bart Van Assche'" <bvanassche@acm.org>,
        <daejun7.park@samsung.com>, "'Avri Altman'" <Avri.Altman@wdc.com>,
        <jejb@linux.ibm.com>, <martin.petersen@oracle.com>,
        <asutoshd@codeaurora.org>, <beanhuo@micron.com>,
        <stanley.chu@mediatek.com>, <cang@codeaurora.org>,
        <tomas.winkler@intel.com>
Cc:     <linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        "'Sang-yoon Oh'" <sangyoon.oh@samsung.com>,
        "'Sung-Jun Park'" <sungjun07.park@samsung.com>,
        "'yongmyung lee'" <ymhungry.lee@samsung.com>,
        "'Jinyoung CHOI'" <j-young.choi@samsung.com>,
        "'Adel Choi'" <adel.choi@samsung.com>,
        "'BoRam Shin'" <boram.shin@samsung.com>
In-Reply-To: <SN6PR04MB3872FBE1EAE3578BFD2601189A7F0@SN6PR04MB3872.namprd04.prod.outlook.com>
Subject: RE: [PATCH v6 0/5] scsi: ufs: Add Host Performance Booster Support
Date:   Thu, 16 Jul 2020 22:15:17 +0530
Message-ID: <001301d65b90$8012c3e0$80384ba0$@samsung.com>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Thread-Index: AQNTAwbo7R95v2Jv+B+oDyvdEhuZkAJ3qsxbAEskZzgCs8hfhQGhYIDUpdhZ7/A=
Content-Language: en-in
Content-Type: text/plain; charset="utf-8"
CMS-TYPE: 105P
References: <CGME20200713103423epcms2p8442ee7cc22395e4a4cedf224f95c45e8@epcms2p8>
        <963815509.21594636682161.JavaMail.epsvc@epcpadp2>
        <SN6PR04MB38720C3D8FC176C3C7FB51B89A7E0@SN6PR04MB3872.namprd04.prod.outlook.com>
        <4174fcf4-73ec-8e3f-90a5-1e7584e3e2d0@acm.org>
        <SN6PR04MB3872FBE1EAE3578BFD2601189A7F0@SN6PR04MB3872.namprd04.prod.outlook.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Hi Avi,

> -----Original Message-----
> From: Avi Shchislowski <Avi.Shchislowski=40wdc.com>
> Sent: 16 July 2020 15:31
> To: Bart Van Assche <bvanassche=40acm.org>; daejun7.park=40samsung.com; A=
vri
> Altman <Avri.Altman=40wdc.com>; jejb=40linux.ibm.com;
> martin.petersen=40oracle.com; asutoshd=40codeaurora.org;
> beanhuo=40micron.com; stanley.chu=40mediatek.com; cang=40codeaurora.org;
> tomas.winkler=40intel.com; ALIM AKHTAR <alim.akhtar=40samsung.com>
> Cc: linux-scsi=40vger.kernel.org; linux-kernel=40vger.kernel.org; Sang-yo=
on Oh
> <sangyoon.oh=40samsung.com>; Sung-Jun Park
> <sungjun07.park=40samsung.com>; yongmyung lee
> <ymhungry.lee=40samsung.com>; Jinyoung CHOI <j-young.choi=40samsung.com>;
> Adel Choi <adel.choi=40samsung.com>; BoRam Shin
> <boram.shin=40samsung.com>
> Subject: RE: =5BPATCH v6 0/5=5D scsi: ufs: Add Host Performance Booster S=
upport
>=20
>=20
>=20
> > -----Original Message-----
> > From: Bart Van Assche <bvanassche=40acm.org>
> > Sent: Thursday, July 16, 2020 4:42 AM
> > To: Avi Shchislowski <Avi.Shchislowski=40wdc.com>;
> > daejun7.park=40samsung.com; Avri Altman <Avri.Altman=40wdc.com>;
> > jejb=40linux.ibm.com; martin.petersen=40oracle.com;
> > asutoshd=40codeaurora.org; beanhuo=40micron.com;
> stanley.chu=40mediatek.com;
> > cang=40codeaurora.org; tomas.winkler=40intel.com; ALIM AKHTAR
> > <alim.akhtar=40samsung.com>
> > Cc: linux-scsi=40vger.kernel.org; linux-kernel=40vger.kernel.org;
> > Sang-yoon Oh <sangyoon.oh=40samsung.com>; Sung-Jun Park
> > <sungjun07.park=40samsung.com>; yongmyung lee
> > <ymhungry.lee=40samsung.com>; Jinyoung CHOI <j-
> young.choi=40samsung.com>;
> > Adel Choi <adel.choi=40samsung.com>; BoRam Shin
> <boram.shin=40samsung.com>
> > Subject: Re: =5BPATCH v6 0/5=5D scsi: ufs: Add Host Performance Booster
> > Support
> >
> > CAUTION: This email originated from outside of Western Digital. Do not
> > click on links or open attachments unless you recognize the sender and
> > know that the content is safe.
> >
> >
> > On 2020-07-15 11:34, Avi Shchislowski wrote:
> > > My name is Avi Shchislowski, I am managing the WDC's Linux Host R&D
> > > team
> > in which Avri is a member of.
> > > As the review process of HPB is progressing very constructively, we
> > > are getting
> > more and more requests from OEMs, Inquiring about HPB in general, and
> > host control mode in particular.
> > >
> > > Their main concern is that HPB will make it to 5.9 merge window, but
> > > the host
> > control mode patches will not.
> > > Thus, because of recent Google's GKI, the next Android LTS might not
> > > include
> > HPB with host control mode.
> > >
> > > Aside of those requests, initial host control mode testing are
> > > showing
> > promising prospective with respect of performance gain.
> > >
> > > What would be, in your opinion, the best policy that host control
> > > mode is
> > included in next Android LTS?
> >
> > Hi Avi,
> >
> > Are you perhaps referring to the HPB patch series that has already been
> posted?
> > Although I'm not sure of this, I think that the SCSI maintainer
> > expects more
> > Reviewed-by: and Tested-by: tags. Has anyone from WDC already taken
> > the time to review and/or test this patch series?
> >
> > Thanks,
> >
> > Bart.
>=20
> Yes, I am referring to the current proposal which I am replying to:
> =5BPATCH v6 0/5=5D scsi: ufs: Add Host Performance Booster Support This p=
roposal
> does not contains host mode, hence our customers concern.
> What would be, in your opinion, the best policy that host control mode is
> included in next Android LTS  assuming it will be based on kernel v5.9 ?
>=20
This series has nothing to do with Host mode control, this series is target=
ed for device mode control. General consensus here is to land this series a=
s it is (unless someone has more review comments) and lets add/enhance what=
ever need to be done for adding Host mode controls as well as other HPB2.0 =
related changes.

> Thanks,
> Avi