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SubjectRe: [PATCH 3/3] scsi: ufs: use UFS device indicated maximum LU number
On 2020-01-10 10:36, Bean Huo wrote:
> From: Bean Huo <beanhuo@micron.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.
>
> Signed-off-by: Bean Huo <beanhuo@micron.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 5ca7ea4f223e..810eeca0de63 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 {
> @@ -548,12 +547,19 @@ struct ufs_dev_desc {
>
> /**
> * 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 a297fe55e36a..c6ea5d88222d 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3286,7 +3286,7 @@ 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,
> @@ -4540,7 +4540,7 @@ 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,

Looks good to me.
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>

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