linux-kernel - RE: [PATCH v22 3/4] scsi: ufs: Prepare HPB read for cached sub-region

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Date:   Tue, 23 Feb 2021 13:49:16 +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 3/4] scsi: ufs: Prepare HPB read for cached sub-region


> +static int ufshpb_fill_ppn_from_page(struct ufshpb_lu *hpb,
> +                                    struct ufshpb_map_ctx *mctx, int pos,
> +                                    int len, u64 *ppn_buf)
> +{
> +       struct page *page;
> +       int index, offset;
> +       int copied;
> +
> +       index = pos / (PAGE_SIZE / HPB_ENTRY_SIZE);
> +       offset = pos % (PAGE_SIZE / HPB_ENTRY_SIZE);
Maybe cache hpb->entries_per_page in ufshpb_lu_parameter_init as well?

> +
> +       if ((offset + len) <= (PAGE_SIZE / HPB_ENTRY_SIZE))
> +               copied = len;
> +       else
> +               copied = (PAGE_SIZE / HPB_ENTRY_SIZE) - offset;
> +
> +       page = mctx->m_page[index];
> +       if (unlikely(!page)) {
> +               dev_err(&hpb->sdev_ufs_lu->sdev_dev,
> +                       "error. cannot find page in mctx\n");
> +               return -ENOMEM;
> +       }
> +
> +       memcpy(ppn_buf, page_address(page) + (offset * HPB_ENTRY_SIZE),
> +              copied * HPB_ENTRY_SIZE);
> +
> +       return copied;
> +}