linux-kernel - [PATCH 6/7] scsi: ufs: Enable writing config descriptor

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Date:   Tue, 29 May 2018 11:17:39 -0700
From:   Evan Green <evgreen@...omium.org>
To:     Vinayak Holikatti <vinholikatti@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanislav Nijnikov <stanislav.nijnikov@....com>,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org
Cc:     Gwendal Grignou <gwendal@...omium.org>,
        Evan Green <evgreen@...omium.org>
Subject: [PATCH 6/7] scsi: ufs: Enable writing config descriptor

This change enables writing to fields of the config descriptor
via sysfs. It can be used to provision an unprovisioned UFS
device, or reprovision an unlocked device.

Signed-off-by: Evan Green <evgreen@...omium.org>
---
 drivers/scsi/ufs/ufs-sysfs.c | 64 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 61 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index 623c56074572..54e9f3bca9db 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -252,6 +252,31 @@ static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
 	return ret;
 }
 
+static ssize_t ufs_sysfs_write_desc_param(struct ufs_hba *hba,
+				  enum desc_idn desc_id,
+				  u8 desc_index,
+				  u8 param_offset,
+				  const char *buf,
+				  ssize_t buf_size,
+				  u8 width)
+{
+	int ret;
+	unsigned long long value;
+
+	if (kstrtoull(buf, 0, &value))
+		return -EINVAL;
+
+	/* Convert to big endian, and send only the appropriate width. */
+	value = cpu_to_be64(value);
+	ret = ufshcd_rw_desc_param(hba, UPIU_QUERY_OPCODE_WRITE_DESC, desc_id,
+				desc_index, param_offset,
+				(u8 *)&value + 8 - width, width);
+	if (ret)
+		return -EINVAL;
+
+	return buf_size;
+}
+
 #define UFS_DESC_PARAM(_name, _puname, _duname, _size)			\
 static ssize_t _name##_show(struct device *dev,				\
 	struct device_attribute *attr, char *buf)			\
@@ -357,8 +382,25 @@ static ssize_t cfg_unit_store(struct device *dev,
 	return count;
 }
 
-#define UFS_CONFIG_DESC_PARAM(_name, _uname, _size)			\
-	UFS_DESC_PARAM(cfg_##_name, _uname, CONFIGURATION, _size)
+#define UFS_CONFIG_DESC_PARAM(_name, _puname, _size)			\
+static ssize_t cfg_##_name##_show(struct device *dev,			\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	return ufs_sysfs_read_desc_param(hba,				\
+		QUERY_DESC_IDN_CONFIGURATION, 0,			\
+		CONFIGURATION_DESC_PARAM##_puname, buf, _size);		\
+}									\
+static ssize_t cfg_##_name##_store(struct device *dev,			\
+		struct device_attribute *attr, const char *buf,		\
+		size_t count)						\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	return ufs_sysfs_write_desc_param(hba,				\
+		QUERY_DESC_IDN_CONFIGURATION, 0,			\
+		CONFIGURATION_DESC_PARAM##_puname, buf, count, _size);	\
+}									\
+static DEVICE_ATTR_RW(cfg_##_name)
 
 #define UFS_CONFIG_UNIT_DESC_PARAM(_name, _uname, _size)		\
 static ssize_t unit_##_name##_show(struct device *dev,			\
@@ -375,7 +417,23 @@ static ssize_t unit_##_name##_show(struct device *dev,			\
 	return ufs_sysfs_read_desc_param(hba,				\
 		QUERY_DESC_IDN_CONFIGURATION, 0, offset, buf, _size);	\
 }									\
-static DEVICE_ATTR_RO(unit_##_name)
+static ssize_t unit_##_name##_store(struct device *dev,			\
+		struct device_attribute *attr, const char *buf,		\
+		size_t count)						\
+{									\
+	struct ufs_hba *hba = dev_get_drvdata(dev);			\
+	size_t offset = CONFIGURATION_DESC_PARAM_UNIT0 +		\
+		(hba->sysfs_config_unit *				\
+		 CONFIGURATION_UNIT_DESC_SIZE) +			\
+		 CONFIGURATION_UNIT_DESC_PARAM_##_uname;		\
+	if (offset + _size > hba->desc_size.conf_desc) {		\
+		return -EINVAL;						\
+	}								\
+	return ufs_sysfs_write_desc_param(hba,				\
+		QUERY_DESC_IDN_CONFIGURATION, 0, offset, buf, count,	\
+		_size);							\
+}									\
+static DEVICE_ATTR_RW(unit_##_name)
 
 UFS_CONFIG_DESC_PARAM(number_of_luns, _NUM_LU, 1);
 UFS_CONFIG_DESC_PARAM(boot_enable, _BOOT_ENBL, 1);
-- 
2.13.5