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scsi: ufs: Add checking lifetime attribute for WriteBooster

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Because WB performs writes in SLC mode, it is not possible to use
WriteBooster indefinitely. Vendors can set a lifetime limit in the device.
If the lifetime exceeds this limit, the device ican disable the WB feature.

The feature is defined in the "bWriteBoosterBufferLifeTimeEst (IDN = 1E)"
attribute.

With lifetime exceeding the limit value, the current driver continuously
performs the following query:

	- Write Flag: WB_ENABLE / DISABLE
	- Read attr: Available Buffer Size
	- Read attr: Current Buffer Size

This patch recognizes that WriteBooster is no longer supported by the
device, and prevents unnecessary queries.

Link: https://lore.kernel.org/r/1891546521.01643252701746.JavaMail.epsvc@epcpadp3
Reviewed-by: Asutosh Das <quic_asutoshd@quicinc.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Jinyoung Choi <j-young.choi@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Jinyoung Choi 2022-01-27 12:00:25 +09:00 committed by Martin K. Petersen
parent 0790797aca
commit f681d1078d
2 changed files with 58 additions and 0 deletions
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6
drivers/scsi/ufs/ufs.h
View file

@ -43,6 +43,12 @@
/* WriteBooster buffer is available only for the logical unit from 0 to 7 */
#define UFS_UPIU_MAX_WB_LUN_ID 8
/*
* WriteBooster buffer lifetime has a limit setted by vendor.
* If it is over the limit, WriteBooster feature will be disabled.
*/
#define UFS_WB_EXCEED_LIFETIME 0x0B
/* Well known logical unit id in LUN field of UPIU */
enum {
UFS_UPIU_REPORT_LUNS_WLUN = 0x81,

52
drivers/scsi/ufs/ufshcd.c
View file

@ -5778,6 +5778,47 @@ static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
return false;
}
static void ufshcd_wb_force_disable(struct ufs_hba *hba)
{
if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
ufshcd_wb_toggle_flush(hba, false);
ufshcd_wb_toggle_flush_during_h8(hba, false);
ufshcd_wb_toggle(hba, false);
hba->caps &= ~UFSHCD_CAP_WB_EN;
dev_info(hba->dev, "%s: WB force disabled\n", __func__);
}
static bool ufshcd_is_wb_buf_lifetime_available(struct ufs_hba *hba)
{
u32 lifetime;
int ret;
u8 index;
index = ufshcd_wb_get_query_index(hba);
ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR,
QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST,
index, 0, &lifetime);
if (ret) {
dev_err(hba->dev,
"%s: bWriteBoosterBufferLifeTimeEst read failed %d\n",
__func__, ret);
return false;
}
if (lifetime == UFS_WB_EXCEED_LIFETIME) {
dev_err(hba->dev, "%s: WB buf lifetime is exhausted 0x%02X\n",
__func__, lifetime);
return false;
}
dev_dbg(hba->dev, "%s: WB buf lifetime is 0x%02X\n",
__func__, lifetime);
return true;
}
static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
{
int ret;
@ -5786,6 +5827,12 @@ static bool ufshcd_wb_need_flush(struct ufs_hba *hba)
if (!ufshcd_is_wb_allowed(hba))
return false;
if (!ufshcd_is_wb_buf_lifetime_available(hba)) {
ufshcd_wb_force_disable(hba);
return false;
}
/*
* The ufs device needs the vcc to be ON to flush.
* With user-space reduction enabled, it's enough to enable flush
@ -7486,6 +7533,7 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
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
@ -7537,6 +7585,10 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, u8 *desc_buf)
if (!d_lu_wb_buf_alloc)
goto wb_disabled;
}
if (!ufshcd_is_wb_buf_lifetime_available(hba))
goto wb_disabled;
return;
wb_disabled: