[PATCH 5/6] scsi: ufs: ufs-sysfs: Expose UFS power info

Can Guo
2023-09-11T06:02:06Z

Having UFS power info available in sysfs makes it easier to tell the state
of the link during runtime considering we have a bounch of power saving
features and various combinations for backward compatiblity.

Signed-off-by: Can Guo <quic_cang@quicinc.com>
---
drivers/ufs/core/ufs-sysfs.c | 71 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)

diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index c959064..53af490 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -628,6 +628,76 @@ static const struct attribute_group ufs_sysfs_monitor_group = {
.attrs = ufs_sysfs_monitor_attrs,
};

+static ssize_t gear_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%u\n", hba->pwr_info.gear_rx);
+}
+
+static ssize_t lane_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%u\n", hba->pwr_info.lane_rx);
+}
+
+static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%u\n", hba->pwr_info.pwr_rx);
+}
+
+static ssize_t rate_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%u\n", hba->pwr_info.hs_rate);
+}
+
+static ssize_t dev_pm_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", hba->curr_dev_pwr_mode);
+}
+
+static ssize_t link_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", hba->uic_link_state);
+}
+
+static DEVICE_ATTR_RO(gear);
+static DEVICE_ATTR_RO(lane);
+static DEVICE_ATTR_RO(mode);
+static DEVICE_ATTR_RO(rate);
+static DEVICE_ATTR_RO(dev_pm);
+static DEVICE_ATTR_RO(link_state);
+
+static struct attribute *ufs_power_info_attrs[] = {
+ &dev_attr_gear.attr,
+ &dev_attr_lane.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_rate.attr,
+ &dev_attr_dev_pm.attr,
+ &dev_attr_link_state.attr,
+ NULL
+};
+
+static const struct attribute_group ufs_sysfs_power_info_group = {
+ .name = "power_info",
+ .attrs = ufs_power_info_attrs,
+};
+
static ssize_t ufs_sysfs_read_desc_param(struct ufs_hba *hba,
enum desc_idn desc_id,
u8 desc_index,
@@ -1233,6 +1303,7 @@ static const struct attribute_group *ufs_sysfs_groups[] = {
&ufs_sysfs_default_group,
&ufs_sysfs_capabilities_group,
&ufs_sysfs_monitor_group,
+ &ufs_sysfs_power_info_group,
&ufs_sysfs_device_descriptor_group,
&ufs_sysfs_interconnect_descriptor_group,
&ufs_sysfs_geometry_descriptor_group,
--
2.7.4