linux-kernel - Re: [PATCH v3 8/8] scsi: ufs: Use UFS device indicated maximum LU number

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Message-ID: <CAGOxZ53rxMZRXU7tFF2yuAHmgXDp4Ho21y5_+BgV55D=Y-SzkA@mail.gmail.com>
Date:   Sun, 19 Jan 2020 07:40:47 +0530
From:   Alim Akhtar <alim.akhtar@...il.com>
To:     Bean Huo <huobean@...il.com>
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>, asutoshd@...eaurora.org,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        "Bean Huo (beanhuo)" <beanhuo@...ron.com>,
        Bart Van Assche <bvanassche@....org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Can Guo <cang@...eaurora.org>, linux-scsi@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 8/8] scsi: ufs: Use UFS device indicated maximum LU number

On Sun, Jan 19, 2020 at 5:45 AM Bean Huo <huobean@...il.com> wrote:
>
> From: Bean Huo <beanhuo@...ron.com>
>
> According to Jedec standard UFS 3.0 and UFS 2.1 Spec, Maximum number
> of logical units supported by the UFS device is indicated by parameter
> bMaxNumberLU in Geometry Descriptor. This patch is to delete current
> hard code macro definition of UFS_UPIU_MAX_GENERAL_LUN, and switch to
> use device indicated number instead.
>
> Reviewed-by: Asutosh Das <asutoshd@...eaurora.org>
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
> ---
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>

>  drivers/scsi/ufs/ufs-sysfs.c |  2 +-
>  drivers/scsi/ufs/ufs.h       | 12 +++++++++---
>  drivers/scsi/ufs/ufshcd.c    |  4 ++--
>  3 files changed, 12 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index 720be3f64be7..dbdf8b01abed 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -713,7 +713,7 @@ static ssize_t _pname##_show(struct device *dev,                    \
>         struct scsi_device *sdev = to_scsi_device(dev);                 \
>         struct ufs_hba *hba = shost_priv(sdev->host);                   \
>         u8 lun = ufshcd_scsi_to_upiu_lun(sdev->lun);                    \
> -       if (!ufs_is_valid_unit_desc_lun(lun))                           \
> +       if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun))           \
>                 return -EINVAL;                                         \
>         return ufs_sysfs_read_desc_param(hba, QUERY_DESC_IDN_##_duname, \
>                 lun, _duname##_DESC_PARAM##_puname, buf, _size);        \
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index c982bcc94662..dde2eb02f76f 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -63,7 +63,6 @@
>  #define UFS_UPIU_MAX_UNIT_NUM_ID       0x7F
>  #define UFS_MAX_LUNS           (SCSI_W_LUN_BASE + UFS_UPIU_MAX_UNIT_NUM_ID)
>  #define UFS_UPIU_WLUN_ID       (1 << 7)
> -#define UFS_UPIU_MAX_GENERAL_LUN       8
>
>  /* Well known logical unit id in LUN field of UPIU */
>  enum {
> @@ -539,12 +538,19 @@ struct ufs_dev_info {
>
>  /**
>   * ufs_is_valid_unit_desc_lun - checks if the given LUN has a unit descriptor
> + * @dev_info: pointer of instance of struct ufs_dev_info
>   * @lun: LU number to check
>   * @return: true if the lun has a matching unit descriptor, false otherwise
>   */
> -static inline bool ufs_is_valid_unit_desc_lun(u8 lun)
> +static inline bool ufs_is_valid_unit_desc_lun(struct ufs_dev_info *dev_info,
> +               u8 lun)
>  {
> -       return lun == UFS_UPIU_RPMB_WLUN || (lun < UFS_UPIU_MAX_GENERAL_LUN);
> +       if (!dev_info || !dev_info->max_lu_supported) {
> +               pr_err("Max General LU supported by UFS isn't initilized\n");
> +               return false;
> +       }
> +
> +       return lun == UFS_UPIU_RPMB_WLUN || (lun < dev_info->max_lu_supported);
>  }
>
>  #endif /* End of Header */
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index dd10558f4d01..bf714221455e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3270,7 +3270,7 @@ static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba,
>          * Unit descriptors are only available for general purpose LUs (LUN id
>          * from 0 to 7) and RPMB Well known LU.
>          */
> -       if (!ufs_is_valid_unit_desc_lun(lun))
> +       if (!ufs_is_valid_unit_desc_lun(&hba->dev_info, lun))
>                 return -EOPNOTSUPP;
>
>         return ufshcd_read_desc_param(hba, QUERY_DESC_IDN_UNIT, lun,
> @@ -4525,7 +4525,7 @@ static int ufshcd_get_lu_wp(struct ufs_hba *hba,
>          * protected so skip reading bLUWriteProtect parameter for
>          * it. For other W-LUs, UNIT DESCRIPTOR is not available.
>          */
> -       else if (lun >= UFS_UPIU_MAX_GENERAL_LUN)
> +       else if (lun >= hba->dev_info.max_lu_supported)
>                 ret = -ENOTSUPP;
>         else
>                 ret = ufshcd_read_unit_desc_param(hba,
> --
> 2.17.1
>


-- 
Regards,
Alim