linux-kernel - [PATCH] ufs: core: Add support for qTimestamp attribute

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Message-Id: <1678036587-26927-1-git-send-email-Arthur.Simchaev@wdc.com>
Date:   Sun,  5 Mar 2023 19:16:27 +0200
From:   Arthur Simchaev <Arthur.Simchaev@....com>
To:     martin.petersen@...cle.com
Cc:     avri.altman@....com, Avi.Shchislowski@....com, beanhuo@...ron.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        bvanassche@....org, Arthur Simchaev <Arthur.Simchaev@....com>
Subject: [PATCH] ufs: core: Add support for qTimestamp attribute

The new qTimestamp attribute was added to UFS 4.0 spec, in order to
synchronize timestamp between device logs and the host.The spec recommend
to send this attribute upon device power-on Reset/HW reset or when
switching to Active state (using SSU command). Due to this attribute,
the attribute's max value was extended to 8 bytes. As a result,
the new definition of struct utp_upiu_query_v4_0 was added.

Signed-off-by: Arthur Simchaev <Arthur.Simchaev@....com>
---
 drivers/ufs/core/ufshcd.c        | 37 +++++++++++++++++++++++++++++++++++++
 include/uapi/scsi/scsi_bsg_ufs.h | 25 +++++++++++++++++++++++++
 include/ufs/ufs.h                |  1 +
 3 files changed, 63 insertions(+)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 629442c..48ef2e3 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -8378,6 +8378,40 @@ static int ufshcd_device_params_init(struct ufs_hba *hba)
 	return ret;
 }
 
+static void ufshcd_set_timestamp_attr(struct ufs_hba *hba)
+{
+	int err;
+	struct ufs_query_req *request = NULL;
+	struct ufs_dev_info *dev_info = &hba->dev_info;
+	struct utp_upiu_query_v4_0 *upiu_data;
+
+	if (dev_info->wspecversion < 0x400)
+		return;
+
+	ufshcd_hold(hba, false);
+
+	mutex_lock(&hba->dev_cmd.lock);
+
+	ufshcd_init_query(hba, &request, 0,
+			  UPIU_QUERY_OPCODE_WRITE_ATTR,
+			  QUERY_ATTR_IDN_TIMESTAMP, 0, 0);
+
+	request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
+
+	upiu_data = (struct utp_upiu_query_v4_0 *)&request->upiu_req;
+
+	put_unaligned_be64(ktime_get_real_ns(), &upiu_data->osf3);
+
+	err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
+
+	if (err)
+		dev_err(hba->dev, "%s: failed to set timestamp %d\n",
+			__func__, err);
+
+	mutex_unlock(&hba->dev_cmd.lock);
+	ufshcd_release(hba);
+}
+
 /**
  * ufshcd_add_lus - probe and add UFS logical units
  * @hba: per-adapter instance
@@ -8547,6 +8581,8 @@ static int ufshcd_device_init(struct ufs_hba *hba, bool init_dev_params)
 	ufshcd_set_ufs_dev_active(hba);
 	ufshcd_force_reset_auto_bkops(hba);
 
+	ufshcd_set_timestamp_attr(hba);
+
 	/* Gear up to HS gear if supported */
 	if (hba->max_pwr_info.is_valid) {
 		/*
@@ -9566,6 +9602,7 @@ static int __ufshcd_wl_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
 		ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
 		if (ret)
 			goto set_old_link_state;
+		ufshcd_set_timestamp_attr(hba);
 	}
 
 	if (ufshcd_keep_autobkops_enabled_except_suspend(hba))
diff --git a/include/uapi/scsi/scsi_bsg_ufs.h b/include/uapi/scsi/scsi_bsg_ufs.h
index 2801b65..fd3f9e5e 100644
--- a/include/uapi/scsi/scsi_bsg_ufs.h
+++ b/include/uapi/scsi/scsi_bsg_ufs.h
@@ -71,6 +71,31 @@ struct utp_upiu_query {
 };
 
 /**
+ * struct utp_upiu_query_v4_0 - upiu request buffer structure for
+ * query request >= UFS 4.0 spec.
+ * @opcode: command to perform B-0
+ * @idn: a value that indicates the particular type of data B-1
+ * @index: Index to further identify data B-2
+ * @selector: Index to further identify data B-3
+ * @osf4: spec field B-5
+ * @osf5: spec field B 6,7
+ * @osf6: spec field DW 8,9
+ * @osf7: spec field DW 10,11
+ */
+struct utp_upiu_query_v4_0 {
+	__u8 opcode;
+	__u8 idn;
+	__u8 index;
+	__u8 selector;
+	__u8 osf3;
+	__u8 osf4;
+	__be16 osf5;
+	__be32 osf6;
+	__be32 osf7;
+	__be32 reserved;
+};
+
+/**
  * struct utp_upiu_cmd - Command UPIU structure
  * @data_transfer_len: Data Transfer Length DW-3
  * @cdb: Command Descriptor Block CDB DW-4 to DW-7
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
index 4e8d624..198cb39 100644
--- a/include/ufs/ufs.h
+++ b/include/ufs/ufs.h
@@ -170,6 +170,7 @@ enum attr_idn {
 	QUERY_ATTR_IDN_WB_BUFF_LIFE_TIME_EST    = 0x1E,
 	QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE        = 0x1F,
 	QUERY_ATTR_IDN_EXT_IID_EN		= 0x2A,
+	QUERY_ATTR_IDN_TIMESTAMP		= 0x30
 };
 
 /* Descriptor idn for Query requests */
-- 
2.7.4