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scsi: ufs: provide sysfs attribute to select the PM level 

This patch provides the sysfs attribute to choose the power management
level for UFS runtime and system suspend.

Reviewed-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
subhashj@codeaurora.org 2016-12-22 18:41:00 -08:00 committed by Martin K. Petersen
parent fcb0c4b08a
commit 09690d5a6a
2 changed files with 146 additions and 0 deletions
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144
drivers/scsi/ufs/ufshcd.c
View File

@ -686,6 +686,28 @@ static inline int ufshcd_is_hba_active(struct ufs_hba *hba)
return (ufshcd_readl(hba, REG_CONTROLLER_ENABLE) & 0x1) ? 0 : 1;
}
static const char *ufschd_uic_link_state_to_string(
enum uic_link_state state)
{
switch (state) {
case UIC_LINK_OFF_STATE: return "OFF";
case UIC_LINK_ACTIVE_STATE: return "ACTIVE";
case UIC_LINK_HIBERN8_STATE: return "HIBERN8";
default: return "UNKNOWN";
}
}
static const char *ufschd_ufs_dev_pwr_mode_to_string(
enum ufs_dev_pwr_mode state)
{
switch (state) {
case UFS_ACTIVE_PWR_MODE: return "ACTIVE";
case UFS_SLEEP_PWR_MODE: return "SLEEP";
case UFS_POWERDOWN_PWR_MODE: return "POWERDOWN";
default: return "UNKNOWN";
}
}
u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba)
{
/* HCI version 1.0 and 1.1 supports UniPro 1.41 */
@ -6709,6 +6731,127 @@ int ufshcd_runtime_idle(struct ufs_hba *hba)
}
EXPORT_SYMBOL(ufshcd_runtime_idle);
static inline ssize_t ufshcd_pm_lvl_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count,
bool rpm)
{
struct ufs_hba *hba = dev_get_drvdata(dev);
unsigned long flags, value;
if (kstrtoul(buf, 0, &value))
return -EINVAL;
if ((value < UFS_PM_LVL_0) || (value >= UFS_PM_LVL_MAX))
return -EINVAL;
spin_lock_irqsave(hba->host->host_lock, flags);
if (rpm)
hba->rpm_lvl = value;
else
hba->spm_lvl = value;
spin_unlock_irqrestore(hba->host->host_lock, flags);
return count;
}
static ssize_t ufshcd_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;
}
static ssize_t ufshcd_rpm_lvl_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return ufshcd_pm_lvl_store(dev, attr, buf, count, true);
}
static void ufshcd_add_rpm_lvl_sysfs_nodes(struct ufs_hba *hba)
{
hba->rpm_lvl_attr.show = ufshcd_rpm_lvl_show;
hba->rpm_lvl_attr.store = ufshcd_rpm_lvl_store;
sysfs_attr_init(&hba->rpm_lvl_attr.attr);
hba->rpm_lvl_attr.attr.name = "rpm_lvl";
hba->rpm_lvl_attr.attr.mode = 0644;
if (device_create_file(hba->dev, &hba->rpm_lvl_attr))
dev_err(hba->dev, "Failed to create sysfs for rpm_lvl\n");
}
static ssize_t ufshcd_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;
}
static ssize_t ufshcd_spm_lvl_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
return ufshcd_pm_lvl_store(dev, attr, buf, count, false);
}
static void ufshcd_add_spm_lvl_sysfs_nodes(struct ufs_hba *hba)
{
hba->spm_lvl_attr.show = ufshcd_spm_lvl_show;
hba->spm_lvl_attr.store = ufshcd_spm_lvl_store;
sysfs_attr_init(&hba->spm_lvl_attr.attr);
hba->spm_lvl_attr.attr.name = "spm_lvl";
hba->spm_lvl_attr.attr.mode = 0644;
if (device_create_file(hba->dev, &hba->spm_lvl_attr))
dev_err(hba->dev, "Failed to create sysfs for spm_lvl\n");
}
static inline void ufshcd_add_sysfs_nodes(struct ufs_hba *hba)
{
ufshcd_add_rpm_lvl_sysfs_nodes(hba);
ufshcd_add_spm_lvl_sysfs_nodes(hba);
}
/**
* ufshcd_shutdown - shutdown routine
* @hba: per adapter instance
@ -7133,6 +7276,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
ufshcd_set_ufs_dev_active(hba);
async_schedule(ufshcd_async_scan, hba);
ufshcd_add_sysfs_nodes(hba);
return 0;

2
drivers/scsi/ufs/ufshcd.h
View File

@ -435,6 +435,8 @@ struct ufs_hba {
enum ufs_pm_level rpm_lvl;
/* Desired UFS power management level during system PM */
enum ufs_pm_level spm_lvl;
struct device_attribute rpm_lvl_attr;
struct device_attribute spm_lvl_attr;
int pm_op_in_progress;
struct ufshcd_lrb *lrb;