linux-kernel - RE: [RFC PATCH 5/5] scsi: ufs: Prepare HPB read for cached sub-region

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Date:   Sat, 6 Jun 2020 18:38:54 +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 5/5] scsi: ufs: Prepare HPB read for cached sub-region


> +static bool ufshpb_test_ppn_dirty(struct ufshpb_lu *hpb, int rgn_idx,
> +                                  int srgn_idx, int srgn_offset, int cnt)


> +
> +       for (i = 0; i < bit_len; i++) {
> +               if (test_bit(srgn_offset + i, srgn->mctx->ppn_dirty))
Maybe use a mask or hweight instead of testing bit by bit?

> +static void
> +ufshpb_set_hpb_read_to_upiu(struct ufshpb_lu *hpb, struct ufshcd_lrb
> *lrbp,
> +                                 u32 lpn, u64 ppn,  unsigned int transfer_len)
> +{
> +       unsigned char *cdb = lrbp->ucd_req_ptr->sc.cdb;
> +
> +       cdb[0] = UFSHPB_READ;
> +
> +       put_unaligned_be32(lpn, &cdb[2]);
Is this needed? The lba is already occupying bytes 2..5

> +       put_unaligned_be64(ppn, &cdb[6]);
> +       cdb[14] = transfer_len;
> +}
> +

Thanks,
Avri