Commit 09690d5a authored by Subhash Jadavani's avatar Subhash Jadavani Committed by Martin K. Petersen
Browse files

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: default avatarSujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent fcb0c4b0

drivers/scsi/ufs/ufshcd.c

+144 −0
Original line number Diff line number Diff line
@@ -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;

drivers/scsi/ufs/ufshcd.h

+2 −0
Original line number Diff line number Diff line
@@ -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;