Expands sysfs boot_lun attribute to be writable. Necessary to enable
proper support for LUN switching on some UFS devices.
Signed-off-by: Nia Espera <a5b6@xxxxxxxxxx>
---
drivers/scsi/ufs/ufs-sysfs.c | 67 +++++++++++++++++++++++++++++++++++-
1 file changed, 66 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index 5c405ff7b6ea..7bf5d6c3d0ec 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -1047,6 +1047,71 @@ static inline bool ufshcd_is_wb_attrs(enum attr_idn idn)
idn <= QUERY_ATTR_IDN_CURR_WB_BUFF_SIZE;
}
+static ssize_t boot_lun_enabled_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ u32 slot;
+ int ret;
+ u8 index = 0;
+
+ down(&hba->host_sem);
+ if (!ufshcd_is_user_access_allowed(hba)) {
+ up(&hba->host_sem);
+ return -EBUSY;
+ }
+ if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN_BOOT_LU_EN))
+ index = ufshcd_wb_get_query_index(hba);
+ ufshcd_rpm_get_sync(hba);
+
+ ret = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_BOOT_LU_EN, index, 0, &slot);
+
+ ufshcd_rpm_put_sync(hba);
+ if (ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = sysfs_emit(buf, "0x%08X\n", slot);
+out:
+ up(&hba->host_sem);
+ return ret;
+}
+
+static ssize_t boot_lun_enabled_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+ u32 slot;
+ int ret;
+ u8 index = 0;
+
+ if (kstrtouint(buf, 0, &slot) < 0)
+ return -EINVAL;
+
+ down(&hba->host_sem);
+ if (!ufshcd_is_user_access_allowed(hba)) {
+ up(&hba->host_sem);
+ return -EBUSY;
+ }
+ if (ufshcd_is_wb_attrs(QUERY_ATTR_IDN_BOOT_LU_EN))
+ index = ufshcd_wb_get_query_index(hba);
+ ufshcd_rpm_get_sync(hba);
+
+ ret = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+ QUERY_ATTR_IDN_BOOT_LU_EN, index, 0, &slot);
+ ufshcd_rpm_put_sync(hba);
+ if (ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+out:
+ up(&hba->host_sem);
+ return ret ? ret : count;
+}
+
#define UFS_ATTRIBUTE(_name, _uname) \
static ssize_t _name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
@@ -1077,8 +1142,8 @@ out: \
return ret; \
} \
static DEVICE_ATTR_RO(_name)
+static DEVICE_ATTR_RW(boot_lun_enabled);
-UFS_ATTRIBUTE(boot_lun_enabled, _BOOT_LU_EN);
UFS_ATTRIBUTE(max_data_size_hpb_single_cmd, _MAX_HPB_SINGLE_CMD);
UFS_ATTRIBUTE(current_power_mode, _POWER_MODE);
UFS_ATTRIBUTE(active_icc_level, _ACTIVE_ICC_LVL);
--
2.36.1
