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SubjectRe: [PATCH v2] scsi: ufs: Disable WriteBooster capability in non-supported UFS device
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On 6/24/2020 12:41 AM, Stanley Chu wrote:
> If UFS device is not qualified to enter the detection of WriteBooster
> probing by disallowed UFS version or device quirks, then WriteBooster
> capability in host shall be disabled to prevent any WriteBooster
> operations in the future.
>
> Fixes: 3d17b9b5ab11 ("scsi: ufs: Add write booster feature support")
> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
> ---
> drivers/scsi/ufs/ufshcd.c | 35 +++++++++++++++++++----------------
> 1 file changed, 19 insertions(+), 16 deletions(-)
>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>


> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index f173ad1bd79f..c62bd47beeaa 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -6847,21 +6847,31 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
>
> static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
> {
> + struct ufs_dev_info *dev_info = &hba->dev_info;
> u8 lun;
> u32 d_lu_wb_buf_alloc;
>
> if (!ufshcd_is_wb_allowed(hba))
> return;
> + /*
> + * Probe WB only for UFS-2.2 and UFS-3.1 (and later) devices or
> + * UFS devices with quirk UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES
> + * enabled
> + */
> + if (!(dev_info->wspecversion >= 0x310 ||
> + dev_info->wspecversion == 0x220 ||
> + (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES)))
> + goto wb_disabled;
>
> if (hba->desc_size[QUERY_DESC_IDN_DEVICE] <
> DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP + 4)
> goto wb_disabled;
>
> - hba->dev_info.d_ext_ufs_feature_sup =
> + dev_info->d_ext_ufs_feature_sup =
> get_unaligned_be32(desc_buf +
> DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
>
> - if (!(hba->dev_info.d_ext_ufs_feature_sup & UFS_DEV_WRITE_BOOSTER_SUP))
> + if (!(dev_info->d_ext_ufs_feature_sup & UFS_DEV_WRITE_BOOSTER_SUP))
> goto wb_disabled;
>
> /*
> @@ -6870,17 +6880,17 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
> * a max of 1 lun would have wb buffer configured.
> * Now only shared buffer mode is supported.
> */
> - hba->dev_info.b_wb_buffer_type =
> + dev_info->b_wb_buffer_type =
> desc_buf[DEVICE_DESC_PARAM_WB_TYPE];
>
> - hba->dev_info.b_presrv_uspc_en =
> + dev_info->b_presrv_uspc_en =
> desc_buf[DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN];
>
> - if (hba->dev_info.b_wb_buffer_type == WB_BUF_MODE_SHARED) {
> - hba->dev_info.d_wb_alloc_units =
> + if (dev_info->b_wb_buffer_type == WB_BUF_MODE_SHARED) {
> + dev_info->d_wb_alloc_units =
> get_unaligned_be32(desc_buf +
> DEVICE_DESC_PARAM_WB_SHARED_ALLOC_UNITS);
> - if (!hba->dev_info.d_wb_alloc_units)
> + if (!dev_info->d_wb_alloc_units)
> goto wb_disabled;
> } else {
> for (lun = 0; lun < UFS_UPIU_MAX_WB_LUN_ID; lun++) {
> @@ -6891,7 +6901,7 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
> (u8 *)&d_lu_wb_buf_alloc,
> sizeof(d_lu_wb_buf_alloc));
> if (d_lu_wb_buf_alloc) {
> - hba->dev_info.wb_dedicated_lu = lun;
> + dev_info->wb_dedicated_lu = lun;
> break;
> }
> }
> @@ -6977,14 +6987,7 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
>
> ufs_fixup_device_setup(hba);
>
> - /*
> - * Probe WB only for UFS-3.1 devices or UFS devices with quirk
> - * UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES enabled
> - */
> - if (dev_info->wspecversion >= 0x310 ||
> - dev_info->wspecversion == 0x220 ||
> - (hba->dev_quirks & UFS_DEVICE_QUIRK_SUPPORT_EXTENDED_FEATURES))
> - ufshcd_wb_probe(hba, desc_buf);
> + ufshcd_wb_probe(hba, desc_buf);
>
> /*
> * ufshcd_read_string_desc returns size of the string
>


--
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Linux Foundation Collaborative Project

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