linux-kernel - RE: [RFC PATCH v2 3/5] scsi: ufs: Introduce HPB module

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Message-ID: <SN6PR04MB46405EC52240E00F5D634E2AFC9A0@SN6PR04MB4640.namprd04.prod.outlook.com>
Date:   Wed, 17 Jun 2020 08:07:40 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...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: [RFC PATCH v2 3/5] scsi: ufs: Introduce HPB module

 
> 
> This is a patch for the HPB module.
> The HPB module queries UFS for device information during initialization.
> We added the export symbol to two functions in ufshcd.c to initialize
> the HPB module.
> 
> The HPB module can be loaded or built-in as needed.
> The mininum size of the memory pool used in the HPB module is
Typo minimum

> implemented
> as a module parameter, so that it can be configurable by the user.
> 
> To gurantee a minimum memory pool size of 4MB:
> $ insmod ufshpb.ko ufshpb_host_map_kbytes=4096
You are going through a lot of troubles to make it a loadable module.
What are, in your opinion, the pros and cons of this design decision?