linux-kernel - RE: [PATCH v1 1/2] scsi: ufs: Add L2P entry swap quirk for Micron UFS in HPB READ command

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Message-ID: <DM6PR04MB6575F7580C428373EAAA33B4FCF29@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Thu, 5 Aug 2021 06:34:22 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <huobean@...il.com>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v1 1/2] scsi: ufs: Add L2P entry swap quirk for Micron UFS
 in HPB READ command

> From: Bean Huo <beanhuo@...ron.com>
> 
> For the Micron UFS, L2P entry need to be swapped in HPB READ command
> before sending HPB READ command to the UFS device. Add this quirk
> UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ to fix this
> inconsistency.
> 
> Fixes: 2fff76f87542 ("scsi: ufs: ufshpb: Prepare HPB read for cached sub-
> region")
Not really needed - the patch is fine.

> Signed-off-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Avri Altman <avri.altman@....com>

> ---
>  drivers/scsi/ufs/ufs_quirks.h |  6 ++++++
>  drivers/scsi/ufs/ufshcd.c     |  3 ++-
>  drivers/scsi/ufs/ufshpb.c     | 15 ++++++++++-----
>  3 files changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufs_quirks.h b/drivers/scsi/ufs/ufs_quirks.h
> index 07f559ac5883..35ec9ea79869 100644
> --- a/drivers/scsi/ufs/ufs_quirks.h
> +++ b/drivers/scsi/ufs/ufs_quirks.h
> @@ -116,4 +116,10 @@ struct ufs_dev_fix {
>   */
>  #define UFS_DEVICE_QUIRK_DELAY_AFTER_LPM        (1 << 11)
> 
> +/*
> + * Some UFS devices require L2P entry should be swapped before being sent to
> the
> + * UFS device for HPB READ command.
> + */
> +#define UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ (1 << 12)
> +
>  #endif /* UFS_QUIRKS_H_ */
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 47a5085f16a9..c3a14d3b0030 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -199,7 +199,8 @@ ufs_get_desired_pm_lvl_for_dev_link_state(enum
> ufs_dev_pwr_mode dev_state,
>  static struct ufs_dev_fix ufs_fixups[] = {
>         /* UFS cards deviations table */
>         UFS_FIX(UFS_VENDOR_MICRON, UFS_ANY_MODEL,
> -               UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
> +               UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
> +               UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ),
>         UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
>                 UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM |
>                 UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE |
> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index 54e8e019bdbe..d0eb14be47a3 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -323,15 +323,19 @@ ufshpb_get_pos_from_lpn(struct ufshpb_lu *hpb,
> unsigned long lpn, int *rgn_idx,
>  }
> 
>  static void
> -ufshpb_set_hpb_read_to_upiu(struct ufshpb_lu *hpb, struct ufshcd_lrb *lrbp,
> -                           u32 lpn, __be64 ppn, u8 transfer_len, int read_id)
> +ufshpb_set_hpb_read_to_upiu(struct ufs_hba *hba, struct ufshpb_lu *hpb,
> +                           struct ufshcd_lrb *lrbp, u32 lpn, __be64 ppn,
> +                           u8 transfer_len, int read_id)
>  {
>         unsigned char *cdb = lrbp->cmd->cmnd;
> -
> +       __be64 ppn_tmp = ppn;
>         cdb[0] = UFSHPB_READ;
> 
> +       if (hba->dev_quirks &
> UFS_DEVICE_QUIRK_SWAP_L2P_ENTRY_FOR_HPB_READ)
> +               ppn_tmp = swab64(ppn);
> +
>         /* ppn value is stored as big-endian in the host memory */
> -       memcpy(&cdb[6], &ppn, sizeof(__be64));
> +       memcpy(&cdb[6], &ppn_tmp, sizeof(__be64));
>         cdb[14] = transfer_len;
>         cdb[15] = read_id;
> 
> @@ -689,7 +693,8 @@ int ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb
> *lrbp)
>                 }
>         }
> 
> -       ufshpb_set_hpb_read_to_upiu(hpb, lrbp, lpn, ppn, transfer_len, read_id);
> +       ufshpb_set_hpb_read_to_upiu(hba, hpb, lrbp, lpn, ppn, transfer_len,
> +                                   read_id);
> 
>         hpb->stats.hit_cnt++;
>         return 0;
> --
> 2.25.1