linux-kernel - RE: [PATCH v6 0/5] scsi: ufs: Add Host Performance Booster Support

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Date:   Thu, 16 Jul 2020 22:15:17 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Avi Shchislowski'" <Avi.Shchislowski@....com>,
        "'Bart Van Assche'" <bvanassche@....org>,
        <daejun7.park@...sung.com>, "'Avri Altman'" <Avri.Altman@....com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <asutoshd@...eaurora.org>, <beanhuo@...ron.com>,
        <stanley.chu@...iatek.com>, <cang@...eaurora.org>,
        <tomas.winkler@...el.com>
Cc:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "'Sang-yoon Oh'" <sangyoon.oh@...sung.com>,
        "'Sung-Jun Park'" <sungjun07.park@...sung.com>,
        "'yongmyung lee'" <ymhungry.lee@...sung.com>,
        "'Jinyoung CHOI'" <j-young.choi@...sung.com>,
        "'Adel Choi'" <adel.choi@...sung.com>,
        "'BoRam Shin'" <boram.shin@...sung.com>
Subject: RE: [PATCH v6 0/5] scsi: ufs: Add Host Performance Booster Support

Hi Avi,

> -----Original Message-----
> From: Avi Shchislowski <Avi.Shchislowski@....com>
> Sent: 16 July 2020 15:31
> To: Bart Van Assche <bvanassche@....org>; daejun7.park@...sung.com; Avri
> Altman <Avri.Altman@....com>; jejb@...ux.ibm.com;
> martin.petersen@...cle.com; asutoshd@...eaurora.org;
> beanhuo@...ron.com; stanley.chu@...iatek.com; cang@...eaurora.org;
> tomas.winkler@...el.com; ALIM AKHTAR <alim.akhtar@...sung.com>
> Cc: linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org; Sang-yoon Oh
> <sangyoon.oh@...sung.com>; Sung-Jun Park
> <sungjun07.park@...sung.com>; yongmyung lee
> <ymhungry.lee@...sung.com>; Jinyoung CHOI <j-young.choi@...sung.com>;
> Adel Choi <adel.choi@...sung.com>; BoRam Shin
> <boram.shin@...sung.com>
> Subject: RE: [PATCH v6 0/5] scsi: ufs: Add Host Performance Booster Support
> 
> 
> 
> > -----Original Message-----
> > From: Bart Van Assche <bvanassche@....org>
> > Sent: Thursday, July 16, 2020 4:42 AM
> > To: Avi Shchislowski <Avi.Shchislowski@....com>;
> > daejun7.park@...sung.com; Avri Altman <Avri.Altman@....com>;
> > jejb@...ux.ibm.com; martin.petersen@...cle.com;
> > asutoshd@...eaurora.org; beanhuo@...ron.com;
> stanley.chu@...iatek.com;
> > cang@...eaurora.org; tomas.winkler@...el.com; ALIM AKHTAR
> > <alim.akhtar@...sung.com>
> > Cc: linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org;
> > Sang-yoon Oh <sangyoon.oh@...sung.com>; Sung-Jun Park
> > <sungjun07.park@...sung.com>; yongmyung lee
> > <ymhungry.lee@...sung.com>; Jinyoung CHOI <j-
> young.choi@...sung.com>;
> > Adel Choi <adel.choi@...sung.com>; BoRam Shin
> <boram.shin@...sung.com>
> > Subject: Re: [PATCH v6 0/5] 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.
> 
> Yes, I am referring to the current proposal which I am replying to:
> [PATCH v6 0/5] scsi: ufs: Add Host Performance Booster Support This proposal
> 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 ?
> 
This series has nothing to do with Host mode control, this series is targeted for device mode control. General consensus here is to land this series as it is (unless someone has more review comments) and lets add/enhance whatever need to be done for adding Host mode controls as well as other HPB2.0 related changes.

> Thanks,
> Avi