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Commit 59ba60c7 authored by Subhash Jadavani's avatar Subhash Jadavani Committed by David Keitel
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.

Change-Id: I5beedadff1ac3a1ac1f8d36ab88fc3b2ecb75e88
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent e318d1fa

drivers/scsi/ufs/ufshcd.c

+122 −0
Original line number Diff line number Diff line
@@ -6222,6 +6222,127 @@ 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 = S_IRUGO | S_IWUSR;

	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 = S_IRUGO | S_IWUSR;

	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
@@ -6671,6 +6792,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) 
	async_schedule(ufshcd_async_scan, hba);



	UFSDBG_ADD_DEBUGFS(hba)

	ufshcd_add_sysfs_nodes(hba);



	return 0;

drivers/scsi/ufs/ufshcd.h

+2 −0
Original line number Diff line number Diff line
@@ -475,6 +475,8 @@ 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;