linux-kernel - [PATCH v2 3/4] scsi: ufs: customize flush threshold for WriteBooster

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Message-ID: <20200509093716.21010-4-stanley.chu@mediatek.com>
Date:   Sat, 9 May 2020 17:37:15 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     <linux-scsi@...r.kernel.org>, <martin.petersen@...cle.com>,
        <avri.altman@....com>, <alim.akhtar@...sung.com>,
        <jejb@...ux.ibm.com>, <asutoshd@...eaurora.org>
CC:     <beanhuo@...ron.com>, <cang@...eaurora.org>,
        <matthias.bgg@...il.com>, <bvanassche@....org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kuohong.wang@...iatek.com>,
        <peter.wang@...iatek.com>, <chun-hung.wu@...iatek.com>,
        <andy.teng@...iatek.com>, Stanley Chu <stanley.chu@...iatek.com>
Subject: [PATCH v2 3/4] scsi: ufs: customize flush threshold for WriteBooster

Allow flush threshold for WriteBooster to be customizable by
vendors. To achieve this, make the value as a variable in struct
ufs_hba_variant_params.

Besides, use macro UFS_WB_BUF_REMAIN_PERCENT() instead to provide
more flexible usage of WriteBooster available buffer values.

Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
---
 drivers/scsi/ufs/ufs.h    | 5 +----
 drivers/scsi/ufs/ufshcd.c | 7 ++++---
 drivers/scsi/ufs/ufshcd.h | 1 +
 3 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index b3135344ab3f..fadba3a3bbcd 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -478,10 +478,7 @@ enum ufs_dev_pwr_mode {
 	UFS_POWERDOWN_PWR_MODE	= 3,
 };
 
-enum ufs_dev_wb_buf_avail_size {
-	UFS_WB_10_PERCENT_BUF_REMAIN = 0x1,
-	UFS_WB_40_PERCENT_BUF_REMAIN = 0x4,
-};
+#define UFS_WB_BUF_REMAIN_PERCENT(val) ((val) / 10)
 
 /**
  * struct utp_cmd_rsp - Response UPIU structure
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index cdacbe6378a1..aca50ed39844 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5301,8 +5301,8 @@ static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
 			 cur_buf);
 		return false;
 	}
-	/* Let it continue to flush when >60% full */
-	if (avail_buf < UFS_WB_40_PERCENT_BUF_REMAIN)
+	/* Let it continue to flush when available buffer exceeds threshold */
+	if (avail_buf < hba->vps->wb_flush_threshold)
 		return true;
 
 	return false;
@@ -5336,7 +5336,7 @@ static bool ufshcd_wb_keep_vcc_on(struct ufs_hba *hba)
 	}
 
 	if (!hba->dev_info.b_presrv_uspc_en) {
-		if (avail_buf <= UFS_WB_10_PERCENT_BUF_REMAIN)
+		if (avail_buf <= UFS_WB_BUF_REMAIN_PERCENT(10))
 			return true;
 		return false;
 	}
@@ -7462,6 +7462,7 @@ static const struct attribute_group *ufshcd_driver_groups[] = {
 
 static struct ufs_hba_variant_params ufs_hba_vps = {
 	.hba_enable_delay_us		= 1000,
+	.wb_flush_threshold		= UFS_WB_BUF_REMAIN_PERCENT(40),
 	.devfreq_profile.polling_ms	= 100,
 	.devfreq_profile.target		= ufshcd_devfreq_target,
 	.devfreq_profile.get_dev_status	= ufshcd_devfreq_get_dev_status,
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index f7bdf52ba8b0..e3dfb48e669e 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -570,6 +570,7 @@ struct ufs_hba_variant_params {
 	struct devfreq_dev_profile devfreq_profile;
 	struct devfreq_simple_ondemand_data ondemand_data;
 	u16 hba_enable_delay_us;
+	u32 wb_flush_threshold;
 };
 
 /**
-- 
2.18.0