linux-kernel - RE: [PATCH v24 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Wed, 24 Feb 2021 09:52:43 +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>,
        SEUNGUK SHIN <seunguk.shin@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        BoRam Shin <boram.shin@...sung.com>
Subject: RE: [PATCH v24 4/4] scsi: ufs: Add HPB 2.0 support


>         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);
> +
> +               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))
If is_legacy you shouldn't send fHPBen in the first place, not ignoring its failure.
Also, using a Boolean is limiting you to HPB2.0 vs. HPB1.0.
What would you do in new flags/attributes/descriptors that HPB3.0 will introduce?

> +                       dev_info->hpb_enabled = true;
>         }