Commit a7f1e69d authored by Stanley Chu's avatar Stanley Chu Committed by Martin K. Petersen
Browse files

scsi: ufs: Disable WriteBooster capability for non-supported UFS devices 

If a UFS device is not qualified to use WriteBooster, either due to wrong
UFS version or device-specific quirks, then the capability in host shall be
disabled to prevent any WriteBooster operations in the future.

Link: https://lore.kernel.org/r/20200625030430.25048-1-stanley.chu@mediatek.com


Fixes: 3d17b9b5 ("scsi: ufs: Add write booster feature support")
Tested-by: default avatarSteev Klimaszewski <steev@kali.org>
Reviewed-by: default avatarAvri Altman <avri.altman@wdc.com>
Reviewed-by: default avatarBean Huo <beanhuo@micron.com>
Signed-off-by: default avatarStanley Chu <stanley.chu@mediatek.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 37d09067

drivers/scsi/ufs/ufshcd.c

+19 −16
Original line number Diff line number Diff line
@@ -6846,21 +6846,31 @@ out: 


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;



	/*
@@ -6869,17 +6879,17 @@ 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++) {
@@ -6890,7 +6900,7 @@ 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;

			}

		}
@@ -6976,13 +6986,6 @@ 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);



	/*

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