Message-Id: <20250407085143.173-1-tanghuan@vivo.com>
Date: Mon,  7 Apr 2025 16:51:43 +0800
From: Huan Tang <tanghuan@...o.com>
To: alim.akhtar@...sung.com,
	avri.altman@....com,
	bvanassche@....org,
	James.Bottomley@...senPartnership.com,
	martin.petersen@...cle.com,
	beanhuo@...ron.com,
	luhongfei@...o.com,
	quic_cang@...cinc.com,
	keosung.park@...sung.com,
	viro@...iv.linux.org.uk,
	quic_mnaresh@...cinc.com,
	peter.wang@...iatek.com,
	manivannan.sadhasivam@...aro.org,
	quic_nguyenb@...cinc.com,
	linux@...ssschuh.net,
	ebiggers@...gle.com,
	minwoo.im@...sung.com,
	linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org
Cc: opensource.kernel@...o.com,
	Huan Tang <tanghuan@...o.com>
Subject: [PATCH v9] ufs: core: Add WB buffer resize support

Follow JESD220G, support WB buffer resize feature through sysfs;
Query bit0 of ext_wb_sup to determine whether the device supports
WB resize;Query wb_resize_hint and wb_resize_status to get the
device's resize hint and resize status; Set wb_resize_enable to
enable resize operation. To achieve this goals, four sysfs nodes
have been added:
	1. ext_wb_sup
	2. wb_resize_enable
	3. wb_resize_hint
	4. wb_resize_status
The detailed definition of the four nodes can be found in the sysfs
documentation.

Changelog
===
v8 - > v9:
	1.Add "ext_wb_sup" node
	2.Fix some coding errors,for example: "gerneral" -> "general"
	3.Add a check bit0 of ext_wb_sup
	4.Following Bean's advice: use enum in ufshcd_wb_set_resize_en

v7 - > v8:
	1.Optimized the description in the sysfs-driver-ufs file
	2.Replace uppercase with lowercase, for example: "KEEP" -> "keep"
	3.Fix coding style issues with switch/case statements
 
v6 - > v7:
	1.Use "xxxx_to_string" for string convert
	2.Use uppercase characters, for example: "keep" -> "KEEP"
	3.Resize enable mode support "IDLE"

v5 - > v6:
	1.Fix mistake: obtain the return value of "sysfs_emit"

v4 - > v5:
	1.For the three new attributes: use words in sysfs instead of numbers

v3 - > v4:
	1.modify three attributes name and description in document
	2.add enum wb_resize_en in ufs.h
	3.modify function name and parameters in ufs-sysfs.c, ufshcd.h, ufshcd.c

v2 - > v3:
	Remove needless code:
	drivers/ufs/core/ufs-sysfs.c:441:2:
	index =	ufshcd_wb_get_query_index(hba)

v1 - > v2:
	Remove unused variable "u8 index",
	drivers/ufs/core/ufs-sysfs.c:419:12: warning: variable 'index'
	set but not used.

v1
	https://lore.kernel.org/all/20241025085924.4855-1-tanghuan@vivo.com/
v2
	https://lore.kernel.org/all/20241026004423.135-1-tanghuan@vivo.com/
v3
	https://lore.kernel.org/all/20241028135205.188-1-tanghuan@vivo.com/
v4
	https://lore.kernel.org/all/20241101093318.825-1-tanghuan@vivo.com/
v5
	https://lore.kernel.org/all/20241104134612.178-1-tanghuan@vivo.com/
v6
	https://lore.kernel.org/all/20241104142437.234-1-tanghuan@vivo.com/
v7
	https://lore.kernel.org/all/20250402014536.162-1-tanghuan@vivo.com/
v8
	https://lore.kernel.org/all/20250402075710.224-1-tanghuan@vivo.com/

Signed-off-by: Huan Tang <tanghuan@...o.com>
Signed-off-by: Lu Hongfei <luhongfei@...o.com>
---
 Documentation/ABI/testing/sysfs-driver-ufs |  59 +++++++++
 drivers/ufs/core/ufs-sysfs.c               | 144 +++++++++++++++++++++
 drivers/ufs/core/ufshcd.c                  |  18 +++
 include/ufs/ufs.h                          |  34 ++++-
 include/ufs/ufshcd.h                       |   1 +
 5 files changed, 255 insertions(+), 1 deletion(-)

diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index ae0191295d29..ea9d6186cefd 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1604,3 +1604,62 @@ Description:
 		prevent the UFS from frequently performing clock gating/ungating.
 
 		The attribute is read/write.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/device_descriptor/ext_wb_sup
+What:		/sys/bus/platform/devices/*.ufs/device_descriptor/ext_wb_sup
+Date:		April 2025
+Contact:	Huan Tang <tanghuan@...o.com>
+Description:
+		This file shows extended WriteBooster features supported by
+		the device.
+
+		The file is read only.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/wb_resize_enable
+What:		/sys/bus/platform/devices/*.ufs/wb_resize_enable
+Date:		April 2025
+Contact:	Huan Tang <tanghuan@...o.com>
+Description:
+		The host can enable the WriteBooster buffer resize by setting this
+		attribute.
+
+		========  ======================================
+		idle      There is no resize operation
+		decrease  Decrease WriteBooster buffer size
+		increase  Increase WriteBooster buffer size
+		========  ======================================
+
+		The file is write only.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/attributes/wb_resize_hint
+What:		/sys/bus/platform/devices/*.ufs/attributes/wb_resize_hint
+Date:		April 2025
+Contact:	Huan Tang <tanghuan@...o.com>
+Description:
+		wb_resize_hint indicates hint information about which type of resize
+		for WriteBooster buffer is recommended by the device.
+
+		=========  ======================================
+		keep       Recommend keep the buffer size
+		decrease   Recommend to decrease the buffer size
+		increase   Recommend to increase the buffer size
+		=========  ======================================
+
+		The file is read only.
+
+What:		/sys/bus/platform/drivers/ufshcd/*/attributes/wb_resize_status
+What:		/sys/bus/platform/devices/*.ufs/attributes/wb_resize_status
+Date:		April 2025
+Contact:	Huan Tang <tanghuan@...o.com>
+Description:
+		The host can check the resize operation status of the WriteBooster
+		buffer by reading this attribute.
+
+		================  ========================================
+		idle              Resize operation is not issued
+		in_progress       Resize operation in progress
+		complete_success  Resize operation completed successfully
+		general_fail      Resize operation general failure
+		================  ========================================
+
+		The file is read only.
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index 90b5ab60f5ae..71e8454d07d1 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -57,6 +57,36 @@ static const char *ufs_hs_gear_to_string(enum ufs_hs_gear_tag gear)
 	}
 }
 
+static const char *ufs_wb_resize_hint_to_string(enum wb_resize_hint hint)
+{
+	switch (hint) {
+	case WB_RESIZE_HINT_KEEP:
+		return "keep";
+	case WB_RESIZE_HINT_DECREASE:
+		return "decrease";
+	case WB_RESIZE_HINT_INCREASE:
+		return "increase";
+	default:
+		return "unknown";
+	}
+}
+
+static const char *ufs_wb_resize_status_to_string(enum wb_resize_status status)
+{
+	switch (status) {
+	case WB_RESIZE_STATUS_IDLE:
+		return "idle";
+	case WB_RESIZE_STATUS_IN_PROGRESS:
+		return "in_progress";
+	case WB_RESIZE_STATUS_COMPLETE_SUCCESS:
+		return "complete_success";
+	case WB_RESIZE_STATUS_GENERAL_FAIL:
+		return "general_fail";
+	default:
+		return "unknown";
+	}
+}
+
 static const char *ufshcd_uic_link_state_to_string(
 			enum uic_link_state state)
 {
@@ -411,6 +441,44 @@ static ssize_t wb_flush_threshold_store(struct device *dev,
 	return count;
 }
 
+static const char * const wb_resize_en_mode[] = {
+	[WB_RESIZE_EN_IDLE]		= "idle",
+	[WB_RESIZE_EN_DECREASE]		= "decrease",
+	[WB_RESIZE_EN_INCREASE]		= "increase",
+};
+
+static ssize_t wb_resize_enable_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int mode;
+	ssize_t res;
+
+	if (!ufshcd_is_wb_allowed(hba) || !hba->dev_info.wb_enabled
+		|| !hba->dev_info.b_presrv_uspc_en
+		|| !(hba->dev_info.ext_wb_sup & UFS_DEV_WB_BUF_RESIZE))
+		return -EOPNOTSUPP;
+
+	mode = sysfs_match_string(wb_resize_en_mode, buf);
+	if (mode < 0)
+		return -EINVAL;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		res = -EBUSY;
+		goto out;
+	}
+
+	ufshcd_rpm_get_sync(hba);
+	res = ufshcd_wb_set_resize_en(hba, mode);
+	ufshcd_rpm_put_sync(hba);
+
+out:
+	up(&hba->host_sem);
+	return res < 0 ? res : count;
+}
+
 /**
  * pm_qos_enable_show - sysfs handler to show pm qos enable value
  * @dev: device associated with the UFS controller
@@ -476,6 +544,7 @@ static DEVICE_ATTR_RW(auto_hibern8);
 static DEVICE_ATTR_RW(wb_on);
 static DEVICE_ATTR_RW(enable_wb_buf_flush);
 static DEVICE_ATTR_RW(wb_flush_threshold);
+static DEVICE_ATTR_WO(wb_resize_enable);
 static DEVICE_ATTR_RW(rtc_update_ms);
 static DEVICE_ATTR_RW(pm_qos_enable);
 static DEVICE_ATTR_RO(critical_health);
@@ -491,6 +560,7 @@ static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
 	&dev_attr_wb_on.attr,
 	&dev_attr_enable_wb_buf_flush.attr,
 	&dev_attr_wb_flush_threshold.attr,
+	&dev_attr_wb_resize_enable.attr,
 	&dev_attr_rtc_update_ms.attr,
 	&dev_attr_pm_qos_enable.attr,
 	&dev_attr_critical_health.attr,
@@ -991,6 +1061,7 @@ UFS_DEVICE_DESC_PARAM(device_version, _DEV_VER, 2);
 UFS_DEVICE_DESC_PARAM(number_of_secure_wpa, _NUM_SEC_WPA, 1);
 UFS_DEVICE_DESC_PARAM(psa_max_data_size, _PSA_MAX_DATA, 4);
 UFS_DEVICE_DESC_PARAM(psa_state_timeout, _PSA_TMT, 1);
+UFS_DEVICE_DESC_PARAM(ext_wb_sup, _EXT_WB_SUP, 2);
 UFS_DEVICE_DESC_PARAM(ext_feature_sup, _EXT_UFS_FEATURE_SUP, 4);
 UFS_DEVICE_DESC_PARAM(wb_presv_us_en, _WB_PRESRV_USRSPC_EN, 1);
 UFS_DEVICE_DESC_PARAM(wb_type, _WB_TYPE, 1);
@@ -1023,6 +1094,7 @@ static struct attribute *ufs_sysfs_device_descriptor[] = {
 	&dev_attr_number_of_secure_wpa.attr,
 	&dev_attr_psa_max_data_size.attr,
 	&dev_attr_psa_state_timeout.attr,
+	&dev_attr_ext_wb_sup.attr,
 	&dev_attr_ext_feature_sup.attr,
 	&dev_attr_wb_presv_us_en.attr,
 	&dev_attr_wb_type.attr,
@@ -1495,6 +1567,76 @@ static inline bool ufshcd_is_wb_attrs(enum attr_idn idn)
 		idn <= QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE;
 }
 
+static int wb_read_resize_attrs(struct ufs_hba *hba,
+			enum attr_idn idn, u32 *attr_val)
+{
+	u8 index = 0;
+	int ret;
+
+	if (!ufshcd_is_wb_allowed(hba) || !hba->dev_info.wb_enabled
+		|| !hba->dev_info.b_presrv_uspc_en
+		|| !(hba->dev_info.ext_wb_sup & UFS_DEV_WB_BUF_RESIZE))
+		return -EOPNOTSUPP;
+
+	down(&hba->host_sem);
+	if (!ufshcd_is_user_access_allowed(hba)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	index = ufshcd_wb_get_query_index(hba);
+	ufshcd_rpm_get_sync(hba);
+	ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+			idn, index, 0, attr_val);
+	ufshcd_rpm_put_sync(hba);
+	if (ret)
+		ret = -EINVAL;
+
+out:
+	up(&hba->host_sem);
+	return ret;
+}
+
+static ssize_t wb_resize_hint_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+	u32 value;
+
+	ret = wb_read_resize_attrs(hba,
+			QUERY_ATTR_IDN_WB_BUF_RESIZE_HINT, &value);
+	if (ret)
+		goto out;
+
+	ret = sysfs_emit(buf, "%s\n", ufs_wb_resize_hint_to_string(value));
+
+out:
+	return ret;
+}
+
+static DEVICE_ATTR_RO(wb_resize_hint);
+
+static ssize_t wb_resize_status_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct ufs_hba *hba = dev_get_drvdata(dev);
+	int ret;
+	u32 value;
+
+	ret = wb_read_resize_attrs(hba,
+			QUERY_ATTR_IDN_WB_BUF_RESIZE_STATUS, &value);
+	if (ret)
+		goto out;
+
+	ret = sysfs_emit(buf, "%s\n", ufs_wb_resize_status_to_string(value));
+
+out:
+	return ret;
+}
+
+static DEVICE_ATTR_RO(wb_resize_status);
+
 #define UFS_ATTRIBUTE(_name, _uname)					\
 static ssize_t _name##_show(struct device *dev,				\
 	struct device_attribute *attr, char *buf)			\
@@ -1568,6 +1710,8 @@ static struct attribute *ufs_sysfs_attributes[] = {
 	&dev_attr_wb_avail_buf.attr,
 	&dev_attr_wb_life_time_est.attr,
 	&dev_attr_wb_cur_buf.attr,
+	&dev_attr_wb_resize_hint.attr,
+	&dev_attr_wb_resize_status.attr,
 	NULL,
 };
 
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 83b092cbb864..a73838062ddf 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -6068,6 +6068,21 @@ int ufshcd_wb_toggle_buf_flush(struct ufs_hba *hba, bool enable)
 	return ret;
 }
 
+int ufshcd_wb_set_resize_en(struct ufs_hba *hba, enum wb_resize_en en_mode)
+{
+	int ret;
+	u8 index;
+
+	index = ufshcd_wb_get_query_index(hba);
+	ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+				QUERY_ATTR_IDN_WB_BUF_RESIZE_EN, index, 0, &en_mode);
+	if (ret)
+		dev_err(hba->dev, "%s: Enable WB buf resize operation failed %d\n",
+			__func__, ret);
+
+	return ret;
+}
+
 static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
 						u32 avail_buf)
 {
@@ -8067,6 +8082,9 @@ static void ufshcd_wb_probe(struct ufs_hba *hba, const u8 *desc_buf)
 	 */
 	dev_info->wb_buffer_type = desc_buf[DEVICE_DESC_PARAM_WB_TYPE];
 
+	dev_info->ext_wb_sup =  get_unaligned_be16(desc_buf +
+						DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP);
+
 	dev_info->b_presrv_uspc_en =
 		desc_buf[DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN];
 
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 8a24ed59ec46..9dc8b872b24d 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -180,7 +180,10 @@ enum attr_idn {
 	QUERY_ATTR_IDN_AVAIL_WB_BUFF_SIZE       = 0x1D,
 	QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST    = 0x1E,
 	QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE        = 0x1F,
-	QUERY_ATTR_IDN_TIMESTAMP		= 0x30
+	QUERY_ATTR_IDN_TIMESTAMP		= 0x30,
+	QUERY_ATTR_IDN_WB_BUF_RESIZE_HINT	= 0x3C,
+	QUERY_ATTR_IDN_WB_BUF_RESIZE_EN		= 0x3D,
+	QUERY_ATTR_IDN_WB_BUF_RESIZE_STATUS	= 0x3E,
 };
 
 /* Descriptor idn for Query requests */
@@ -289,6 +292,7 @@ enum device_desc_param {
 	DEVICE_DESC_PARAM_PRDCT_REV		= 0x2A,
 	DEVICE_DESC_PARAM_HPB_VER		= 0x40,
 	DEVICE_DESC_PARAM_HPB_CONTROL		= 0x42,
+	DEVICE_DESC_PARAM_EXT_WB_SUP		= 0x4D,
 	DEVICE_DESC_PARAM_EXT_UFS_FEATURE_SUP	= 0x4F,
 	DEVICE_DESC_PARAM_WB_PRESRV_USRSPC_EN	= 0x53,
 	DEVICE_DESC_PARAM_WB_TYPE		= 0x54,
@@ -383,6 +387,11 @@ enum {
 	UFSHCD_AMP		= 3,
 };
 
+/*  Possible values for wExtendedWriteBoosterSupport */
+enum {
+	UFS_DEV_WB_BUF_RESIZE	= BIT(0),
+};
+
 /* Possible values for dExtendedUFSFeaturesSupport */
 enum {
 	UFS_DEV_HIGH_TEMP_NOTIF		= BIT(4),
@@ -454,6 +463,28 @@ enum ufs_ref_clk_freq {
 	REF_CLK_FREQ_INVAL	= -1,
 };
 
+/* bWriteBoosterBufferResizeEn attribute */
+enum wb_resize_en {
+	WB_RESIZE_EN_IDLE	= 0,
+	WB_RESIZE_EN_DECREASE	= 1,
+	WB_RESIZE_EN_INCREASE	= 2,
+};
+
+/* bWriteBoosterBufferResizeHint attribute */
+enum wb_resize_hint {
+	WB_RESIZE_HINT_KEEP	= 0,
+	WB_RESIZE_HINT_DECREASE	= 1,
+	WB_RESIZE_HINT_INCREASE	= 2,
+};
+
+/* bWriteBoosterBufferResizeStatus attribute */
+enum wb_resize_status {
+	WB_RESIZE_STATUS_IDLE	           = 0,
+	WB_RESIZE_STATUS_IN_PROGRESS       = 1,
+	WB_RESIZE_STATUS_COMPLETE_SUCCESS  = 2,
+	WB_RESIZE_STATUS_GENERAL_FAIL      = 3,
+};
+
 /* Query response result code */
 enum {
 	QUERY_RESULT_SUCCESS                    = 0x00,
@@ -578,6 +609,7 @@ struct ufs_dev_info {
 	bool    wb_buf_flush_enabled;
 	u8	wb_dedicated_lu;
 	u8      wb_buffer_type;
+	u16	ext_wb_sup;
 
 	bool	b_rpm_dev_flush_capable;
 	u8	b_presrv_uspc_en;
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index f56050ce9445..722307182630 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -1471,6 +1471,7 @@ int ufshcd_advanced_rpmb_req_handler(struct ufs_hba *hba, struct utp_upiu_req *r
 				     struct scatterlist *sg_list, enum dma_data_direction dir);
 int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
 int ufshcd_wb_toggle_buf_flush(struct ufs_hba *hba, bool enable);
+int ufshcd_wb_set_resize_en(struct ufs_hba *hba, enum wb_resize_en en_mode);
 int ufshcd_suspend_prepare(struct device *dev);
 int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm);
 void ufshcd_resume_complete(struct device *dev);
-- 
2.39.0

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