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authorStanislav Nijnikov <stanislav.nijnikov@wdc.com>2018-03-01 12:48:06 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2018-03-21 21:21:25 -0400
commit114c1aa210494a02c26aa33f793e5b641df01989 (patch)
treed9b9faa8e0e970b33bf4f10a0c4c5349680dad99
parent61c187e46ebb27f51b52bd0eb68b7f534a300184 (diff)
downloadlinux-114c1aa210494a02c26aa33f793e5b641df01989.tar.bz2
scsi: ufs: sysfs: reworking of the rpm_lvl and spm_lvl entries
Read from these files will return the integer value of the chosen power management level now. Separate entries were added to show the target UFS device and UIC link states. The description of the possible power managements levels was added to the ABI file. The on-write behaviour of these entries wasn't changed. [mkp: typo] Signed-off-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
-rw-r--r--Documentation/ABI/testing/sysfs-driver-ufs67
-rw-r--r--drivers/scsi/ufs/ufs-sysfs.c92
2 files changed, 114 insertions, 45 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
index 07f1c2f8dbfc..83735f79e572 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -802,3 +802,70 @@ Description: This file shows the The amount of physical memory needed
the particular logical unit. The full information about
the attribute could be found at UFS specifications 2.1.
The file is read only.
+
+
+What: /sys/bus/platform/drivers/ufshcd/*/rpm_lvl
+Date: September 2014
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry could be used to set or show the UFS device
+ runtime power management level. The current driver
+ implementation supports 6 levels with next target states:
+ 0 - an UFS device will stay active, an UIC link will
+ stay active
+ 1 - an UFS device will stay active, an UIC link will
+ hibernate
+ 2 - an UFS device will moved to sleep, an UIC link will
+ stay active
+ 3 - an UFS device will moved to sleep, an UIC link will
+ hibernate
+ 4 - an UFS device will be powered off, an UIC link will
+ hibernate
+ 5 - an UFS device will be powered off, an UIC link will
+ be powered off
+
+What: /sys/bus/platform/drivers/ufshcd/*/rpm_target_dev_state
+Date: February 2018
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry shows the target power mode of an UFS device
+ for the chosen runtime power management level.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/rpm_target_link_state
+Date: February 2018
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry shows the target state of an UFS UIC link
+ for the chosen runtime power management level.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/spm_lvl
+Date: September 2014
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry could be used to set or show the UFS device
+ system power management level. The current driver
+ implementation supports 6 levels with next target states:
+ 0 - an UFS device will stay active, an UIC link will
+ stay active
+ 1 - an UFS device will stay active, an UIC link will
+ hibernate
+ 2 - an UFS device will moved to sleep, an UIC link will
+ stay active
+ 3 - an UFS device will moved to sleep, an UIC link will
+ hibernate
+ 4 - an UFS device will be powered off, an UIC link will
+ hibernate
+ 5 - an UFS device will be powered off, an UIC link will
+ be powered off
+
+What: /sys/bus/platform/drivers/ufshcd/*/spm_target_dev_state
+Date: February 2018
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry shows the target power mode of an UFS device
+ for the chosen system power management level.
+ The file is read only.
+
+What: /sys/bus/platform/drivers/ufshcd/*/spm_target_link_state
+Date: February 2018
+Contact: Subhash Jadavani <subhashj@codeaurora.org>
+Description: This entry shows the target state of an UFS UIC link
+ for the chosen system power management level.
+ The file is read only.
diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
index cd7174d2d225..4ff9e0b7eba1 100644
--- a/drivers/scsi/ufs/ufs-sysfs.c
+++ b/drivers/scsi/ufs/ufs-sysfs.c
@@ -57,29 +57,8 @@ static ssize_t rpm_lvl_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
- int curr_len;
- u8 lvl;
-
- curr_len = snprintf(buf, PAGE_SIZE,
- "\nCurrent Runtime PM level [%d] => dev_state [%s] link_state [%s]\n",
- hba->rpm_lvl,
- ufschd_ufs_dev_pwr_mode_to_string(
- ufs_pm_lvl_states[hba->rpm_lvl].dev_state),
- ufschd_uic_link_state_to_string(
- ufs_pm_lvl_states[hba->rpm_lvl].link_state));
-
- curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
- "\nAll available Runtime PM levels info:\n");
- for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
- curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
- "\tRuntime PM level [%d] => dev_state [%s] link_state [%s]\n",
- lvl,
- ufschd_ufs_dev_pwr_mode_to_string(
- ufs_pm_lvl_states[lvl].dev_state),
- ufschd_uic_link_state_to_string(
- ufs_pm_lvl_states[lvl].link_state));
-
- return curr_len;
+
+ return sprintf(buf, "%d\n", hba->rpm_lvl);
}
static ssize_t rpm_lvl_store(struct device *dev,
@@ -88,33 +67,30 @@ static ssize_t rpm_lvl_store(struct device *dev,
return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, true);
}
+static ssize_t rpm_target_dev_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[hba->rpm_lvl].dev_state));
+}
+
+static ssize_t rpm_target_link_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[hba->rpm_lvl].link_state));
+}
+
static ssize_t spm_lvl_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
- int curr_len;
- u8 lvl;
-
- curr_len = snprintf(buf, PAGE_SIZE,
- "\nCurrent System PM level [%d] => dev_state [%s] link_state [%s]\n",
- hba->spm_lvl,
- ufschd_ufs_dev_pwr_mode_to_string(
- ufs_pm_lvl_states[hba->spm_lvl].dev_state),
- ufschd_uic_link_state_to_string(
- ufs_pm_lvl_states[hba->spm_lvl].link_state));
- curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
- "\nAll available System PM levels info:\n");
- for (lvl = UFS_PM_LVL_0; lvl < UFS_PM_LVL_MAX; lvl++)
- curr_len += snprintf((buf + curr_len), (PAGE_SIZE - curr_len),
- "\tSystem PM level [%d] => dev_state [%s] link_state [%s]\n",
- lvl,
- ufschd_ufs_dev_pwr_mode_to_string(
- ufs_pm_lvl_states[lvl].dev_state),
- ufschd_uic_link_state_to_string(
- ufs_pm_lvl_states[lvl].link_state));
-
- return curr_len;
+ return sprintf(buf, "%d\n", hba->spm_lvl);
}
static ssize_t spm_lvl_store(struct device *dev,
@@ -123,12 +99,38 @@ static ssize_t spm_lvl_store(struct device *dev,
return ufs_sysfs_pm_lvl_store(dev, attr, buf, count, false);
}
+static ssize_t spm_target_dev_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ufschd_ufs_dev_pwr_mode_to_string(
+ ufs_pm_lvl_states[hba->spm_lvl].dev_state));
+}
+
+static ssize_t spm_target_link_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", ufschd_uic_link_state_to_string(
+ ufs_pm_lvl_states[hba->spm_lvl].link_state));
+}
+
static DEVICE_ATTR_RW(rpm_lvl);
+static DEVICE_ATTR_RO(rpm_target_dev_state);
+static DEVICE_ATTR_RO(rpm_target_link_state);
static DEVICE_ATTR_RW(spm_lvl);
+static DEVICE_ATTR_RO(spm_target_dev_state);
+static DEVICE_ATTR_RO(spm_target_link_state);
static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
&dev_attr_rpm_lvl.attr,
+ &dev_attr_rpm_target_dev_state.attr,
+ &dev_attr_rpm_target_link_state.attr,
&dev_attr_spm_lvl.attr,
+ &dev_attr_spm_target_dev_state.attr,
+ &dev_attr_spm_target_link_state.attr,
NULL
};