[PATCH] ufs: core: Add support for qTimestamp attribute

[Arthur Simchaev <Arthur.Simchaev@wdc.com>]

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@wdc.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