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Message-Id: <1698811243-5024-1-git-send-email-quic_cang@quicinc.com>
Date: Tue, 31 Oct 2023 21:00:34 -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 v3] 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>
---
v2 -> v3:
1. For mode/gear/rate/dev_pm/link_status, print texts instead of numbers
2. Removed number<->text explanations for mode/rate/gear/dev_pm/link_status in Documentation/ABI/testing/sysfs-driver-ufs
v1 -> v2:
1. Incorporated comments from Bart, Nitin and Mani.
2. Added explanations for lane/mode/rate/gear/dev_pm/link_status in Documentation/ABI/testing/sysfs-driver-ufs
---
Documentation/ABI/testing/sysfs-driver-ufs | 49 ++++++++++++
drivers/ufs/core/ufs-sysfs.c | 120 +++++++++++++++++++++++++++++
include/ufs/unipro.h | 4 +-
3 files changed, 171 insertions(+), 2 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 0c7efaf..b73067b 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -1223,6 +1223,55 @@ 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 PA power mode of UFS.
+
+ 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.
+
+ 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.
+
+ 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.
+
+ 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.
+
+ 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..b8b5dd1 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -7,9 +7,56 @@
#include <asm/unaligned.h>
#include <ufs/ufs.h>
+#include <ufs/unipro.h>
#include "ufs-sysfs.h"
#include "ufshcd-priv.h"
+static const char *ufshcd_ufs_pa_pwr_mode_to_string(enum ufs_pa_pwr_mode mode)
+{
+ switch (mode) {
+ case FAST_MODE: return "FAST_MODE";
+ case SLOW_MODE: return "SLOW_MODE";
+ case FASTAUTO_MODE: return "FASTAUTO_MODE";
+ case SLOWAUTO_MODE: return "SLOWAUTO_MODE";
+ default: return "UNKNOWN";
+ }
+}
+
+static const char *ufshcd_ufs_hs_gear_rate_to_string(enum ufs_hs_gear_rate rate)
+{
+ switch (rate) {
+ case PA_HS_MODE_A: return "HS_RATE_A";
+ case PA_HS_MODE_B: return "HS_RATE_B";
+ default: return "UNKNOWN";
+ }
+}
+
+static const char *ufshcd_ufs_pwm_gear_to_string(enum ufs_pwm_gear_tag gear)
+{
+ switch (gear) {
+ case UFS_PWM_G1: return "PWM_GEAR1";
+ case UFS_PWM_G2: return "PWM_GEAR2";
+ case UFS_PWM_G3: return "PWM_GEAR3";
+ case UFS_PWM_G4: return "PWM_GEAR4";
+ case UFS_PWM_G5: return "PWM_GEAR5";
+ case UFS_PWM_G6: return "PWM_GEAR6";
+ case UFS_PWM_G7: return "PWM_GEAR7";
+ default: return "UNKNOWN";
+ }
+}
+
+static const char *ufshcd_ufs_hs_gear_to_string(enum ufs_hs_gear_tag gear)
+{
+ switch (gear) {
+ case UFS_HS_G1: return "HS_GEAR1";
+ case UFS_HS_G2: return "HS_GEAR2";
+ case UFS_HS_G3: return "HS_GEAR3";
+ case UFS_HS_G4: return "HS_GEAR4";
+ case UFS_HS_G5: return "HS_GEAR5";
+ default: return "UNKNOWN";
+ }
+}
+
static const char *ufshcd_uic_link_state_to_string(
enum uic_link_state state)
{
@@ -628,6 +675,78 @@ static const struct attribute_group ufs_sysfs_monitor_group = {
.attrs = ufs_sysfs_monitor_attrs,
};
+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, "%s\n", ufshcd_ufs_pa_pwr_mode_to_string(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, "%s\n", ufshcd_ufs_hs_gear_rate_to_string(hba->pwr_info.hs_rate));
+}
+
+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, "%s\n", hba->pwr_info.hs_rate ?
+ ufshcd_ufs_hs_gear_to_string(hba->pwr_info.gear_rx) :
+ ufshcd_ufs_pwm_gear_to_string(hba->pwr_info.gear_rx));
+}
+
+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, "%s\n", ufshcd_ufs_dev_pwr_mode_to_string(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, "%s\n", ufshcd_uic_link_state_to_string(hba->uic_link_state));
+}
+
+static DEVICE_ATTR_RO(lane);
+static DEVICE_ATTR_RO(mode);
+static DEVICE_ATTR_RO(rate);
+static DEVICE_ATTR_RO(gear);
+static DEVICE_ATTR_RO(dev_pm);
+static DEVICE_ATTR_RO(link_state);
+
+static struct attribute *ufs_power_info_attrs[] = {
+ &dev_attr_lane.attr,
+ &dev_attr_mode.attr,
+ &dev_attr_rate.attr,
+ &dev_attr_gear.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 +1352,7 @@ 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,
diff --git a/include/ufs/unipro.h b/include/ufs/unipro.h
index 256eb3a..360e124 100644
--- a/include/ufs/unipro.h
+++ b/include/ufs/unipro.h
@@ -193,7 +193,7 @@
#define DME_LocalAFC0ReqTimeOutVal 0xD043
/* PA power modes */
-enum {
+enum ufs_pa_pwr_mode {
FAST_MODE = 1,
SLOW_MODE = 2,
FASTAUTO_MODE = 4,
@@ -205,7 +205,7 @@ enum {
#define PWRMODE_RX_OFFSET 4
/* PA TX/RX Frequency Series */
-enum {
+enum ufs_hs_gear_rate {
PA_HS_MODE_A = 1,
PA_HS_MODE_B = 2,
};
--
2.7.4
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