linux-kernel - RE: [PATCH v22 4/4] scsi: ufs: Add HPB 2.0 support

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Date:   Wed, 24 Feb 2021 08:11:18 +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>,
        Javier Gonzalez <javier.gonz@...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>,
        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 v22 4/4] scsi: ufs: Add HPB 2.0 support


> +       copied = ufshpb_fill_ppn_from_page(hpb, srgn->mctx, srgn_offset,
> +                                          pre_req->wb.len - offset,
> +                                          &addr[offset]);
> +
> +       if (copied < 0)
> +               goto mctx_error;
> +
> +       offset += copied;
> +       srgn_offset += offset;
This seems wrong.
How come the region offset is affected from the offset inside the pages?

> +
> +       if (srgn_offset == hpb->entries_per_srgn) {
> +               srgn_offset = 0;
> +
> +               if (++srgn_idx == hpb->srgns_per_rgn) {
> +                       srgn_idx = 0;
> +                       rgn_idx++;
> +               }
> +       }
> +
> +       if (offset < pre_req->wb.len)
> +               goto next_offset;
If the 512k resides in a single subregion, and span across pages, fill_ppn should take care of that.
If the 512k spans across subregion regions, than it spans across 2 subregions at most,
and maybe you can use it.