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Message-Id: <1698745992-5699-1-git-send-email-quic_cang@quicinc.com>
Date: Tue, 31 Oct 2023 02:53:04 -0700
From: Can Guo <quic_cang@...cinc.com>
To: quic_cang@...cinc.com, bvanassche@....org, mani@...nel.org,
stanley.chu@...iatek.com, adrian.hunter@...el.com,
beanhuo@...ron.com, avri.altman@....com, junwoo80.lee@...sung.com,
martin.petersen@...cle.com
Cc: linux-scsi@...r.kernel.org, Alim Akhtar <alim.akhtar@...sung.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
Lu Hongfei <luhongfei@...o.com>,
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2] scsi: ufs: ufs-sysfs: Expose UFS power info
Having UFS power info available in sysfs makes it easier to tell the state
of the link during runtime considering we have a bunch of power saving
features and various combinations for backward compatibility.
Signed-off-by: Can Guo <quic_cang@...cinc.com>
---
v1 -> v2:
1. Incorporated comments from Bart, Nitin and Mani.
2. Added explanations for gear/lane/rate/dev_pm/link_status in Documentation/ABI/testing/sysfs-driver-ufs
---
Documentation/ABI/testing/sysfs-driver-ufs | 88 ++++++++++++++++++++++++++++++
drivers/ufs/core/ufs-sysfs.c | 71 ++++++++++++++++++++++++
2 files changed, 159 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 0c7efaf..dd2cbac 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1223,6 +1223,94 @@ Description: This file shows the total latency (in micro seconds) of write
The file is read only.
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/lane
+What: /sys/bus/platform/devices/*.ufs/power_info/lane
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows how many lanes are enabled on the UFS link,
+ i.e., an output 2 means UFS link is operating with 2 lanes.
+
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/mode
+What: /sys/bus/platform/devices/*.ufs/power_info/mode
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows the UniPro power mode of UFS link:
+ == ====================================================
+ 1 FAST_MODE
+ 2 SLOW_MODE
+ 4 FASTAUTO_MODE
+ 5 SLOWAUTO_MODE
+ == ====================================================
+
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/rate
+What: /sys/bus/platform/devices/*.ufs/power_info/rate
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows the speed rate of UFS link:
+ == ====================================================
+ 0 Indicates that the gear is in PWM mode
+ 1 HS_MODE_A - High Speed Rate A
+ 2 HS_MODE_B - High Speed Rate B
+ == ====================================================
+
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/gear
+What: /sys/bus/platform/devices/*.ufs/power_info/gear
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows the gear of UFS link. 'rate' indicates whether
+ the gear is in PWM mode or High-Speed mode.
+ == ====================================================
+ 1 PWM_GEAR1
+ 2 PWM_GEAR2
+ 3 PWM_GEAR3
+ 4 PWM_GEAR4
+ 5 PWM_GEAR5
+ 6 PWM_GEAR6
+ 7 PWM_GEAR7
+ == ====================================================
+ 1 HS_GEAR1
+ 2 HS_GEAR2
+ 3 HS_GEAR3
+ 4 HS_GEAR4
+ 5 HS_GEAR5
+ == ====================================================
+
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/dev_pm
+What: /sys/bus/platform/devices/*.ufs/power_info/dev_pm
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows the UFS device power mode:
+ == ====================================================
+ 1 ACTIVE_PWR_MODE
+ 2 SLEEP_PWR_MODE
+ 3 POWERDOWN_PWR_MODE
+ 4 DEEPSLEEP_PWR_MODE
+ == ====================================================
+
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/power_info/link_state
+What: /sys/bus/platform/devices/*.ufs/power_info/link_state
+Date: September 2023
+Contact: Can Guo <quic_cang@...cinc.com>
+Description: This file shows the state of UFS link:
+ == ====================================================
+ 0 UIC_LINK_OFF_STATE
+ 1 UIC_LINK_ACTIVE_STATE
+ 2 UIC_LINK_HIBERN8_STATE
+ 3 UIC_LINK_BROKEN_STATE
+ == ====================================================
+
+ The file is read only.
+
What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/wb_presv_us_en
What: /sys/bus/platform/devices/*.ufs/device_descriptor/wb_presv_us_en
Date: June 2020
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
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