linux-kernel - RE: [PATCH v32 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Mon, 19 Apr 2021 07:19:10 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "bvanassche@....org" <bvanassche@....org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        JinHwan Park <jh.i.park@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        Dukhyun Kwon <d_hyun.kwon@...sung.com>,
        Keoseong Park <keosung.park@...sung.com>,
        Jaemyung Lee <jaemyung.lee@...sung.com>,
        Jieon Seol <jieon.seol@...sung.com>
Subject: RE: [PATCH v32 4/4] scsi: ufs: Add HPB 2.0 support

Hi,
>         if (dev_info->wspecversion >= UFS_DEV_HPB_SUPPORT_VERSION &&
>             (b_ufs_feature_sup & UFS_DEV_HPB_SUPPORT)) {
> -               dev_info->hpb_enabled = true;
> +               bool hpb_en = false;
> +
>                 ufshpb_get_dev_info(hba, desc_buf);
> +
> +               if (!ufshpb_is_legacy(hba))
> +                       err = ufshcd_query_flag_retry(hba,
> +                                                     UPIU_QUERY_OPCODE_READ_FLAG,
> +                                                     QUERY_FLAG_IDN_HPB_EN, 0,
> +                                                     &hpb_en);
> +
> +               if (ufshpb_is_legacy(hba) || (!err && hpb_en))
> +                       dev_info->hpb_enabled = true;
>         }
I think there is a confusion concerning fHPBEn flag.
The spec say: "If host wants to enable HPB, host set the fHPBEn flag as ‘1’."
And its default value is '0'.
So upon successful init, we should set this flag and not read it.

I wouldn't rush to fix it however, before we see what Martin/Greg are planning for this feature.
Thanks,
Avri