linux-kernel - RE: [PATCH v7 00/11] Add Host control mode to HPB

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Date:   Mon, 05 Apr 2021 18:29:23 +0900
From:   Daejun Park <daejun7.park@...sung.com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        Avri Altman <avri.altman@....com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        JinHwan Park <jh.i.park@...sung.com>
Subject: RE: [PATCH v7 00/11] Add Host control mode to HPB

> The HPB spec defines 2 control modes - device control mode and host
> control mode. In oppose to device control mode, in which the host obey
> to whatever recommendation received from the device - In host control
> mode, the host uses its own algorithms to decide which regions should
> be activated or inactivated.
>  
> We kept the host managed heuristic simple and concise.
>  
> Aside from adding a by-spec functionality, host control mode entails
> some further potential benefits: makes the hpb logic transparent and
> readable, while allow tuning / scaling its various parameters, and
> utilize system-wide info to optimize HPB potential.
>  
> This series is based on Samsung's V32 device-control HPB2.0 driver
>  
> This version was tested on Galaxy S20, and Xiaomi Mi10 pro.
> Your meticulous review and testing is mostly welcome and appreciated.
>  
> Thanks,
> Avri
>  
>  
> Avri Altman (11):
>   scsi: ufshpb: Cache HPB Control mode on init
>   scsi: ufshpb: Add host control mode support to rsp_upiu
>   scsi: ufshpb: Transform set_dirty to iterate_rgn
>   scsi: ufshpb: Add reads counter
>   scsi: ufshpb: Make eviction depends on region's reads
>   scsi: ufshpb: Region inactivation in host mode
>   scsi: ufshpb: Add hpb dev reset response
>   scsi: ufshpb: Add "Cold" regions timer
>   scsi: ufshpb: Limit the number of inflight map requests
>   scsi: ufshpb: Add support for host control mode
>   scsi: ufshpb: Make host mode parameters configurable
>  
>  Documentation/ABI/testing/sysfs-driver-ufs |  84 ++-
>  drivers/scsi/ufs/ufshcd.h                  |   2 +
>  drivers/scsi/ufs/ufshpb.c                  | 568 ++++++++++++++++++++-
>  drivers/scsi/ufs/ufshpb.h                  |  44 ++
>  4 files changed, 663 insertions(+), 35 deletions(-)
>  

The patches in this series look good to me.

Reviewed-by: Daejun Park <daejun7.park@...sung.com>