linux_kernel/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

/*
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Rafał Miłecki <zajec5@gmail.com>
 *          Alex Deucher <alexdeucher@gmail.com>
 */
#include <drm/drmP.h>
#include "amdgpu.h"
#include "amdgpu_drv.h"
#include "amdgpu_pm.h"
#include "amdgpu_dpm.h"
#include "atom.h"
#include <linux/power_supply.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>

#include "amd_powerplay.h"

static int amdgpu_debugfs_pm_init(struct amdgpu_device *adev);

void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev)
{
	if (adev->pp_enabled)
		/* TODO */
		return;

	if (adev->pm.dpm_enabled) {
		mutex_lock(&adev->pm.mutex);
		if (power_supply_is_system_supplied() > 0)
			adev->pm.dpm.ac_power = true;
		else
			adev->pm.dpm.ac_power = false;
		if (adev->pm.funcs->enable_bapm)
			amdgpu_dpm_enable_bapm(adev, adev->pm.dpm.ac_power);
		mutex_unlock(&adev->pm.mutex);
	}
}

static ssize_t amdgpu_get_dpm_state(struct device *dev,
				    struct device_attribute *attr,
				    char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	enum amd_pm_state_type pm;

	if (adev->pp_enabled) {
		pm = amdgpu_dpm_get_current_power_state(adev);
	} else
		pm = adev->pm.dpm.user_state;

	return snprintf(buf, PAGE_SIZE, "%s\n",
			(pm == POWER_STATE_TYPE_BATTERY) ? "battery" :
			(pm == POWER_STATE_TYPE_BALANCED) ? "balanced" : "performance");
}

static ssize_t amdgpu_set_dpm_state(struct device *dev,
				    struct device_attribute *attr,
				    const char *buf,
				    size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	enum amd_pm_state_type  state;

	if (strncmp("battery", buf, strlen("battery")) == 0)
		state = POWER_STATE_TYPE_BATTERY;
	else if (strncmp("balanced", buf, strlen("balanced")) == 0)
		state = POWER_STATE_TYPE_BALANCED;
	else if (strncmp("performance", buf, strlen("performance")) == 0)
		state = POWER_STATE_TYPE_PERFORMANCE;
	else {
		count = -EINVAL;
		goto fail;
	}

	if (adev->pp_enabled) {
		amdgpu_dpm_dispatch_task(adev, AMD_PP_EVENT_ENABLE_USER_STATE, &state, NULL);
	} else {
		mutex_lock(&adev->pm.mutex);
		adev->pm.dpm.user_state = state;
		mutex_unlock(&adev->pm.mutex);

		/* Can't set dpm state when the card is off */
		if (!(adev->flags & AMD_IS_PX) ||
		    (ddev->switch_power_state == DRM_SWITCH_POWER_ON))
			amdgpu_pm_compute_clocks(adev);
	}
fail:
	return count;
}

static ssize_t amdgpu_get_dpm_forced_performance_level(struct device *dev,
						struct device_attribute *attr,
								char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;

	if (adev->pp_enabled) {
		enum amd_dpm_forced_level level;

		level = amdgpu_dpm_get_performance_level(adev);
		return snprintf(buf, PAGE_SIZE, "%s\n",
				(level == AMD_DPM_FORCED_LEVEL_AUTO) ? "auto" :
				(level == AMD_DPM_FORCED_LEVEL_LOW) ? "low" :
				(level == AMD_DPM_FORCED_LEVEL_HIGH) ? "high" :
				(level == AMD_DPM_FORCED_LEVEL_MANUAL) ? "manual" : "unknown");
	} else {
		enum amdgpu_dpm_forced_level level;

		level = adev->pm.dpm.forced_level;
		return snprintf(buf, PAGE_SIZE, "%s\n",
				(level == AMDGPU_DPM_FORCED_LEVEL_AUTO) ? "auto" :
				(level == AMDGPU_DPM_FORCED_LEVEL_LOW) ? "low" : "high");
	}
}

static ssize_t amdgpu_set_dpm_forced_performance_level(struct device *dev,
						       struct device_attribute *attr,
						       const char *buf,
						       size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	enum amdgpu_dpm_forced_level level;
	int ret = 0;

	if (strncmp("low", buf, strlen("low")) == 0) {
		level = AMDGPU_DPM_FORCED_LEVEL_LOW;
	} else if (strncmp("high", buf, strlen("high")) == 0) {
		level = AMDGPU_DPM_FORCED_LEVEL_HIGH;
	} else if (strncmp("auto", buf, strlen("auto")) == 0) {
		level = AMDGPU_DPM_FORCED_LEVEL_AUTO;
	} else if (strncmp("manual", buf, strlen("manual")) == 0) {
		level = AMDGPU_DPM_FORCED_LEVEL_MANUAL;
	} else {
		count = -EINVAL;
		goto fail;
	}

	if (adev->pp_enabled)
		amdgpu_dpm_force_performance_level(adev, level);
	else {
		mutex_lock(&adev->pm.mutex);
		if (adev->pm.dpm.thermal_active) {
			count = -EINVAL;
			goto fail;
		}
		ret = amdgpu_dpm_force_performance_level(adev, level);
		if (ret)
			count = -EINVAL;
		else
			adev->pm.dpm.forced_level = level;
		mutex_unlock(&adev->pm.mutex);
	}
fail:
	mutex_unlock(&adev->pm.mutex);

	return count;
}

static ssize_t amdgpu_get_pp_num_states(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	struct pp_states_info data;
	int i, buf_len;

	if (adev->pp_enabled)
		amdgpu_dpm_get_pp_num_states(adev, &data);

	buf_len = snprintf(buf, PAGE_SIZE, "states: %d\n", data.nums);
	for (i = 0; i < data.nums; i++)
		buf_len += snprintf(buf + buf_len, PAGE_SIZE, "%d %s\n", i,
				(data.states[i] == POWER_STATE_TYPE_INTERNAL_BOOT) ? "boot" :
				(data.states[i] == POWER_STATE_TYPE_BATTERY) ? "battery" :
				(data.states[i] == POWER_STATE_TYPE_BALANCED) ? "balanced" :
				(data.states[i] == POWER_STATE_TYPE_PERFORMANCE) ? "performance" : "default");

	return buf_len;
}

static ssize_t amdgpu_get_pp_cur_state(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	struct pp_states_info data;
	enum amd_pm_state_type pm = 0;
	int i = 0;

	if (adev->pp_enabled) {

		pm = amdgpu_dpm_get_current_power_state(adev);
		amdgpu_dpm_get_pp_num_states(adev, &data);

		for (i = 0; i < data.nums; i++) {
			if (pm == data.states[i])
				break;
		}

		if (i == data.nums)
			i = -EINVAL;
	}

	return snprintf(buf, PAGE_SIZE, "%d\n", i);
}

static ssize_t amdgpu_get_pp_force_state(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	struct pp_states_info data;
	enum amd_pm_state_type pm = 0;
	int i;

	if (adev->pp_force_state_enabled && adev->pp_enabled) {
		pm = amdgpu_dpm_get_current_power_state(adev);
		amdgpu_dpm_get_pp_num_states(adev, &data);

		for (i = 0; i < data.nums; i++) {
			if (pm == data.states[i])
				break;
		}

		if (i == data.nums)
			i = -EINVAL;

		return snprintf(buf, PAGE_SIZE, "%d\n", i);

	} else
		return snprintf(buf, PAGE_SIZE, "\n");
}

static ssize_t amdgpu_set_pp_force_state(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	enum amd_pm_state_type state = 0;
	long idx;
	int ret;

	if (strlen(buf) == 1)
		adev->pp_force_state_enabled = false;
	else {
		ret = kstrtol(buf, 0, &idx);

		if (ret) {
			count = -EINVAL;
			goto fail;
		}

		if (adev->pp_enabled) {
			struct pp_states_info data;
			amdgpu_dpm_get_pp_num_states(adev, &data);
			state = data.states[idx];
			/* only set user selected power states */
			if (state != POWER_STATE_TYPE_INTERNAL_BOOT &&
				state != POWER_STATE_TYPE_DEFAULT) {
				amdgpu_dpm_dispatch_task(adev,
						AMD_PP_EVENT_ENABLE_USER_STATE, &state, NULL);
				adev->pp_force_state_enabled = true;
			}
		}
	}
fail:
	return count;
}

static ssize_t amdgpu_get_pp_table(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	char *table = NULL;
	int size, i;

	if (adev->pp_enabled)
		size = amdgpu_dpm_get_pp_table(adev, &table);
	else
		return 0;

	if (size >= PAGE_SIZE)
		size = PAGE_SIZE - 1;

	for (i = 0; i < size; i++) {
		sprintf(buf + i, "%02x", table[i]);
	}
	sprintf(buf + i, "\n");

	return size;
}

static ssize_t amdgpu_set_pp_table(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;

	if (adev->pp_enabled)
		amdgpu_dpm_set_pp_table(adev, buf, count);

	return count;
}

static ssize_t amdgpu_get_pp_dpm_sclk(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	ssize_t size = 0;

	if (adev->pp_enabled)
		size = amdgpu_dpm_print_clock_levels(adev, PP_SCLK, buf);

	return size;
}

static ssize_t amdgpu_set_pp_dpm_sclk(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	int ret;
	long level;

	ret = kstrtol(buf, 0, &level);

	if (ret) {
		count = -EINVAL;
		goto fail;
	}

	if (adev->pp_enabled)
		amdgpu_dpm_force_clock_level(adev, PP_SCLK, level);
fail:
	return count;
}

static ssize_t amdgpu_get_pp_dpm_mclk(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	ssize_t size = 0;

	if (adev->pp_enabled)
		size = amdgpu_dpm_print_clock_levels(adev, PP_MCLK, buf);

	return size;
}

static ssize_t amdgpu_set_pp_dpm_mclk(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	int ret;
	long level;

	ret = kstrtol(buf, 0, &level);

	if (ret) {
		count = -EINVAL;
		goto fail;
	}

	if (adev->pp_enabled)
		amdgpu_dpm_force_clock_level(adev, PP_MCLK, level);
fail:
	return count;
}

static ssize_t amdgpu_get_pp_dpm_pcie(struct device *dev,
		struct device_attribute *attr,
		char *buf)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	ssize_t size = 0;

	if (adev->pp_enabled)
		size = amdgpu_dpm_print_clock_levels(adev, PP_PCIE, buf);

	return size;
}

static ssize_t amdgpu_set_pp_dpm_pcie(struct device *dev,
		struct device_attribute *attr,
		const char *buf,
		size_t count)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct amdgpu_device *adev = ddev->dev_private;
	int ret;
	long level;

	ret = kstrtol(buf, 0, &level);

	if (ret) {
		count = -EINVAL;
		goto fail;
	}

	if (adev->pp_enabled)
		amdgpu_dpm_force_clock_level(adev, PP_PCIE, level);
fail:
	return count;
}

static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, amdgpu_get_dpm_state, amdgpu_set_dpm_state);
static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR,
		   amdgpu_get_dpm_forced_performance_level,
		   amdgpu_set_dpm_forced_performance_level);
static DEVICE_ATTR(pp_num_states, S_IRUGO, amdgpu_get_pp_num_states, NULL);
static DEVICE_ATTR(pp_cur_state, S_IRUGO, amdgpu_get_pp_cur_state, NULL);
static DEVICE_ATTR(pp_force_state, S_IRUGO | S_IWUSR,
		amdgpu_get_pp_force_state,
		amdgpu_set_pp_force_state);
static DEVICE_ATTR(pp_table, S_IRUGO | S_IWUSR,
		amdgpu_get_pp_table,
		amdgpu_set_pp_table);
static DEVICE_ATTR(pp_dpm_sclk, S_IRUGO | S_IWUSR,
		amdgpu_get_pp_dpm_sclk,
		amdgpu_set_pp_dpm_sclk);
static DEVICE_ATTR(pp_dpm_mclk, S_IRUGO | S_IWUSR,
		amdgpu_get_pp_dpm_mclk,
		amdgpu_set_pp_dpm_mclk);
static DEVICE_ATTR(pp_dpm_pcie, S_IRUGO | S_IWUSR,
		amdgpu_get_pp_dpm_pcie,
		amdgpu_set_pp_dpm_pcie);

static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
				      struct device_attribute *attr,
				      char *buf)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	int temp;

	if (!adev->pp_enabled && !adev->pm.funcs->get_temperature)
		temp = 0;
	else
		temp = amdgpu_dpm_get_temperature(adev);

	return snprintf(buf, PAGE_SIZE, "%d\n", temp);
}

static ssize_t amdgpu_hwmon_show_temp_thresh(struct device *dev,
					     struct device_attribute *attr,
					     char *buf)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	int hyst = to_sensor_dev_attr(attr)->index;
	int temp;

	if (hyst)
		temp = adev->pm.dpm.thermal.min_temp;
	else
		temp = adev->pm.dpm.thermal.max_temp;

	return snprintf(buf, PAGE_SIZE, "%d\n", temp);
}

static ssize_t amdgpu_hwmon_get_pwm1_enable(struct device *dev,
					    struct device_attribute *attr,
					    char *buf)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	u32 pwm_mode = 0;

	if (!adev->pp_enabled && !adev->pm.funcs->get_fan_control_mode)
		return -EINVAL;

	pwm_mode = amdgpu_dpm_get_fan_control_mode(adev);

	/* never 0 (full-speed), fuse or smc-controlled always */
	return sprintf(buf, "%i\n", pwm_mode == FDO_PWM_MODE_STATIC ? 1 : 2);
}

static ssize_t amdgpu_hwmon_set_pwm1_enable(struct device *dev,
					    struct device_attribute *attr,
					    const char *buf,
					    size_t count)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	int err;
	int value;

	if (!adev->pp_enabled && !adev->pm.funcs->set_fan_control_mode)
		return -EINVAL;

	err = kstrtoint(buf, 10, &value);
	if (err)
		return err;

	switch (value) {
	case 1: /* manual, percent-based */
		amdgpu_dpm_set_fan_control_mode(adev, FDO_PWM_MODE_STATIC);
		break;
	default: /* disable */
		amdgpu_dpm_set_fan_control_mode(adev, 0);
		break;
	}

	return count;
}

static ssize_t amdgpu_hwmon_get_pwm1_min(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	return sprintf(buf, "%i\n", 0);
}

static ssize_t amdgpu_hwmon_get_pwm1_max(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	return sprintf(buf, "%i\n", 255);
}

static ssize_t amdgpu_hwmon_set_pwm1(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	int err;
	u32 value;

	err = kstrtou32(buf, 10, &value);
	if (err)
		return err;

	value = (value * 100) / 255;

	err = amdgpu_dpm_set_fan_speed_percent(adev, value);
	if (err)
		return err;

	return count;
}

static ssize_t amdgpu_hwmon_get_pwm1(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	int err;
	u32 speed;

	err = amdgpu_dpm_get_fan_speed_percent(adev, &speed);
	if (err)
		return err;

	speed = (speed * 255) / 100;

	return sprintf(buf, "%i\n", speed);
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, amdgpu_hwmon_show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, amdgpu_hwmon_show_temp_thresh, NULL, 1);
static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, amdgpu_hwmon_get_pwm1, amdgpu_hwmon_set_pwm1, 0);
static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, amdgpu_hwmon_get_pwm1_enable, amdgpu_hwmon_set_pwm1_enable, 0);
static SENSOR_DEVICE_ATTR(pwm1_min, S_IRUGO, amdgpu_hwmon_get_pwm1_min, NULL, 0);
static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO, amdgpu_hwmon_get_pwm1_max, NULL, 0);

static struct attribute *hwmon_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
	&sensor_dev_attr_pwm1_min.dev_attr.attr,
	&sensor_dev_attr_pwm1_max.dev_attr.attr,
	NULL
};

static umode_t hwmon_attributes_visible(struct kobject *kobj,
					struct attribute *attr, int index)
{
	struct device *dev = kobj_to_dev(kobj);
	struct amdgpu_device *adev = dev_get_drvdata(dev);
	umode_t effective_mode = attr->mode;

	/* Skip limit attributes if DPM is not enabled */
	if (!adev->pm.dpm_enabled &&
	    (attr == &sensor_dev_attr_temp1_crit.dev_attr.attr ||
	     attr == &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_max.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_min.dev_attr.attr))
		return 0;

	if (adev->pp_enabled)
		return effective_mode;

	/* Skip fan attributes if fan is not present */
	if (adev->pm.no_fan &&
	    (attr == &sensor_dev_attr_pwm1.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_max.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_min.dev_attr.attr))
		return 0;

	/* mask fan attributes if we have no bindings for this asic to expose */
	if ((!adev->pm.funcs->get_fan_speed_percent &&
	     attr == &sensor_dev_attr_pwm1.dev_attr.attr) || /* can't query fan */
	    (!adev->pm.funcs->get_fan_control_mode &&
	     attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr)) /* can't query state */
		effective_mode &= ~S_IRUGO;

	if ((!adev->pm.funcs->set_fan_speed_percent &&
	     attr == &sensor_dev_attr_pwm1.dev_attr.attr) || /* can't manage fan */
	    (!adev->pm.funcs->set_fan_control_mode &&
	     attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr)) /* can't manage state */
		effective_mode &= ~S_IWUSR;

	/* hide max/min values if we can't both query and manage the fan */
	if ((!adev->pm.funcs->set_fan_speed_percent &&
	     !adev->pm.funcs->get_fan_speed_percent) &&
	    (attr == &sensor_dev_attr_pwm1_max.dev_attr.attr ||
	     attr == &sensor_dev_attr_pwm1_min.dev_attr.attr))
		return 0;

	return effective_mode;
}

static const struct attribute_group hwmon_attrgroup = {
	.attrs = hwmon_attributes,
	.is_visible = hwmon_attributes_visible,
};

static const struct attribute_group *hwmon_groups[] = {
	&hwmon_attrgroup,
	NULL
};

void amdgpu_dpm_thermal_work_handler(struct work_struct *work)
{
	struct amdgpu_device *adev =
		container_of(work, struct amdgpu_device,
			     pm.dpm.thermal.work);
	/* switch to the thermal state */
	enum amd_pm_state_type dpm_state = POWER_STATE_TYPE_INTERNAL_THERMAL;

	if (!adev->pm.dpm_enabled)
		return;

	if (adev->pm.funcs->get_temperature) {
		int temp = amdgpu_dpm_get_temperature(adev);

		if (temp < adev->pm.dpm.thermal.min_temp)
			/* switch back the user state */
			dpm_state = adev->pm.dpm.user_state;
	} else {
		if (adev->pm.dpm.thermal.high_to_low)
			/* switch back the user state */
			dpm_state = adev->pm.dpm.user_state;
	}
	mutex_lock(&adev->pm.mutex);
	if (dpm_state == POWER_STATE_TYPE_INTERNAL_THERMAL)
		adev->pm.dpm.thermal_active = true;
	else
		adev->pm.dpm.thermal_active = false;
	adev->pm.dpm.state = dpm_state;
	mutex_unlock(&adev->pm.mutex);

	amdgpu_pm_compute_clocks(adev);
}

static struct amdgpu_ps *amdgpu_dpm_pick_power_state(struct amdgpu_device *adev,
						     enum amd_pm_state_type dpm_state)
{
	int i;
	struct amdgpu_ps *ps;
	u32 ui_class;
	bool single_display = (adev->pm.dpm.new_active_crtc_count < 2) ?
		true : false;

	/* check if the vblank period is too short to adjust the mclk */
	if (single_display && adev->pm.funcs->vblank_too_short) {
		if (amdgpu_dpm_vblank_too_short(adev))
			single_display = false;
	}

	/* certain older asics have a separare 3D performance state,
	 * so try that first if the user selected performance
	 */
	if (dpm_state == POWER_STATE_TYPE_PERFORMANCE)
		dpm_state = POWER_STATE_TYPE_INTERNAL_3DPERF;
	/* balanced states don't exist at the moment */
	if (dpm_state == POWER_STATE_TYPE_BALANCED)
		dpm_state = POWER_STATE_TYPE_PERFORMANCE;

restart_search:
	/* Pick the best power state based on current conditions */
	for (i = 0; i < adev->pm.dpm.num_ps; i++) {
		ps = &adev->pm.dpm.ps[i];
		ui_class = ps->class & ATOM_PPLIB_CLASSIFICATION_UI_MASK;
		switch (dpm_state) {
		/* user states */
		case POWER_STATE_TYPE_BATTERY:
			if (ui_class == ATOM_PPLIB_CLASSIFICATION_UI_BATTERY) {
				if (ps->caps & ATOM_PPLIB_SINGLE_DISPLAY_ONLY) {
					if (single_display)
						return ps;
				} else
					return ps;
			}
			break;
		case POWER_STATE_TYPE_BALANCED:
			if (ui_class == ATOM_PPLIB_CLASSIFICATION_UI_BALANCED) {
				if (ps->caps & ATOM_PPLIB_SINGLE_DISPLAY_ONLY) {
					if (single_display)
						return ps;
				} else
					return ps;
			}
			break;
		case POWER_STATE_TYPE_PERFORMANCE:
			if (ui_class == ATOM_PPLIB_CLASSIFICATION_UI_PERFORMANCE) {
				if (ps->caps & ATOM_PPLIB_SINGLE_DISPLAY_ONLY) {
					if (single_display)
						return ps;
				} else
					return ps;
			}
			break;
		/* internal states */
		case POWER_STATE_TYPE_INTERNAL_UVD:
			if (adev->pm.dpm.uvd_ps)
				return adev->pm.dpm.uvd_ps;
			else
				break;
		case POWER_STATE_TYPE_INTERNAL_UVD_SD:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_SDSTATE)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_UVD_HD:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_HDSTATE)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_UVD_HD2:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_HD2STATE)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_UVD_MVC:
			if (ps->class2 & ATOM_PPLIB_CLASSIFICATION2_MVC)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_BOOT:
			return adev->pm.dpm.boot_ps;
		case POWER_STATE_TYPE_INTERNAL_THERMAL:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_THERMAL)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_ACPI:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_ACPI)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_ULV:
			if (ps->class2 & ATOM_PPLIB_CLASSIFICATION2_ULV)
				return ps;
			break;
		case POWER_STATE_TYPE_INTERNAL_3DPERF:
			if (ps->class & ATOM_PPLIB_CLASSIFICATION_3DPERFORMANCE)
				return ps;
			break;
		default:
			break;
		}
	}
	/* use a fallback state if we didn't match */
	switch (dpm_state) {
	case POWER_STATE_TYPE_INTERNAL_UVD_SD:
		dpm_state = POWER_STATE_TYPE_INTERNAL_UVD_HD;
		goto restart_search;
	case POWER_STATE_TYPE_INTERNAL_UVD_HD:
	case POWER_STATE_TYPE_INTERNAL_UVD_HD2:
	case POWER_STATE_TYPE_INTERNAL_UVD_MVC:
		if (adev->pm.dpm.uvd_ps) {
			return adev->pm.dpm.uvd_ps;
		} else {
			dpm_state = POWER_STATE_TYPE_PERFORMANCE;
			goto restart_search;
		}
	case POWER_STATE_TYPE_INTERNAL_THERMAL:
		dpm_state = POWER_STATE_TYPE_INTERNAL_ACPI;
		goto restart_search;
	case POWER_STATE_TYPE_INTERNAL_ACPI:
		dpm_state = POWER_STATE_TYPE_BATTERY;
		goto restart_search;
	case POWER_STATE_TYPE_BATTERY:
	case POWER_STATE_TYPE_BALANCED:
	case POWER_STATE_TYPE_INTERNAL_3DPERF:
		dpm_state = POWER_STATE_TYPE_PERFORMANCE;
		goto restart_search;
	default:
		break;
	}

	return NULL;
}

static void amdgpu_dpm_change_power_state_locked(struct amdgpu_device *adev)
{
	int i;
	struct amdgpu_ps *ps;
	enum amd_pm_state_type dpm_state;
	int ret;

	/* if dpm init failed */
	if (!adev->pm.dpm_enabled)
		return;

	if (adev->pm.dpm.user_state != adev->pm.dpm.state) {
		/* add other state override checks here */
		if ((!adev->pm.dpm.thermal_active) &&
		    (!adev->pm.dpm.uvd_active))
			adev->pm.dpm.state = adev->pm.dpm.user_state;
	}
	dpm_state = adev->pm.dpm.state;

	ps = amdgpu_dpm_pick_power_state(adev, dpm_state);
	if (ps)
		adev->pm.dpm.requested_ps = ps;
	else
		return;

	/* no need to reprogram if nothing changed unless we are on BTC+ */
	if (adev->pm.dpm.current_ps == adev->pm.dpm.requested_ps) {
		/* vce just modifies an existing state so force a change */
		if (ps->vce_active != adev->pm.dpm.vce_active)
			goto force;
		if (adev->flags & AMD_IS_APU) {
			/* for APUs if the num crtcs changed but state is the same,
			 * all we need to do is update the display configuration.
			 */
			if (adev->pm.dpm.new_active_crtcs != adev->pm.dpm.current_active_crtcs) {
				/* update display watermarks based on new power state */
				amdgpu_display_bandwidth_update(adev);
				/* update displays */
				amdgpu_dpm_display_configuration_changed(adev);
				adev->pm.dpm.current_active_crtcs = adev->pm.dpm.new_active_crtcs;
				adev->pm.dpm.current_active_crtc_count = adev->pm.dpm.new_active_crtc_count;
			}
			return;
		} else {
			/* for BTC+ if the num crtcs hasn't changed and state is the same,
			 * nothing to do, if the num crtcs is > 1 and state is the same,
			 * update display configuration.
			 */
			if (adev->pm.dpm.new_active_crtcs ==
			    adev->pm.dpm.current_active_crtcs) {
				return;
			} else if ((adev->pm.dpm.current_active_crtc_count > 1) &&
				   (adev->pm.dpm.new_active_crtc_count > 1)) {
				/* update display watermarks based on new power state */
				amdgpu_display_bandwidth_update(adev);
				/* update displays */
				amdgpu_dpm_display_configuration_changed(adev);
				adev->pm.dpm.current_active_crtcs = adev->pm.dpm.new_active_crtcs;
				adev->pm.dpm.current_active_crtc_count = adev->pm.dpm.new_active_crtc_count;
				return;
			}
		}
	}

force:
	if (amdgpu_dpm == 1) {
		printk("switching from power state:\n");
		amdgpu_dpm_print_power_state(adev, adev->pm.dpm.current_ps);
		printk("switching to power state:\n");
		amdgpu_dpm_print_power_state(adev, adev->pm.dpm.requested_ps);
	}

	/* update whether vce is active */
	ps->vce_active = adev->pm.dpm.vce_active;

	ret = amdgpu_dpm_pre_set_power_state(adev);
	if (ret)
		return;

	/* update display watermarks based on new power state */
	amdgpu_display_bandwidth_update(adev);
	/* update displays */
	amdgpu_dpm_display_configuration_changed(adev);

	adev->pm.dpm.current_active_crtcs = adev->pm.dpm.new_active_crtcs;
	adev->pm.dpm.current_active_crtc_count = adev->pm.dpm.new_active_crtc_count;

	/* wait for the rings to drain */
	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
		struct amdgpu_ring *ring = adev->rings[i];
		if (ring && ring->ready)
			amdgpu_fence_wait_empty(ring);
	}

	/* program the new power state */
	amdgpu_dpm_set_power_state(adev);

	/* update current power state */
	adev->pm.dpm.current_ps = adev->pm.dpm.requested_ps;

	amdgpu_dpm_post_set_power_state(adev);

	if (adev->pm.funcs->force_performance_level) {
		if (adev->pm.dpm.thermal_active) {
			enum amdgpu_dpm_forced_level level = adev->pm.dpm.forced_level;
			/* force low perf level for thermal */
			amdgpu_dpm_force_performance_level(adev, AMDGPU_DPM_FORCED_LEVEL_LOW);
			/* save the user's level */
			adev->pm.dpm.forced_level = level;
		} else {
			/* otherwise, user selected level */
			amdgpu_dpm_force_performance_level(adev, adev->pm.dpm.forced_level);
		}
	}
}

void amdgpu_dpm_enable_uvd(struct amdgpu_device *adev, bool enable)
{
	if (adev->pp_enabled)
		amdgpu_dpm_powergate_uvd(adev, !enable);
	else {
		if (adev->pm.funcs->powergate_uvd) {
			mutex_lock(&adev->pm.mutex);
			/* enable/disable UVD */
			amdgpu_dpm_powergate_uvd(adev, !enable);
			mutex_unlock(&adev->pm.mutex);
		} else {
			if (enable) {
				mutex_lock(&adev->pm.mutex);
				adev->pm.dpm.uvd_active = true;
				adev->pm.dpm.state = POWER_STATE_TYPE_INTERNAL_UVD;
				mutex_unlock(&adev->pm.mutex);
			} else {
				mutex_lock(&adev->pm.mutex);
				adev->pm.dpm.uvd_active = false;
				mutex_unlock(&adev->pm.mutex);
			}
			amdgpu_pm_compute_clocks(adev);
		}

	}
}

void amdgpu_dpm_enable_vce(struct amdgpu_device *adev, bool enable)
{
	if (adev->pp_enabled)
		amdgpu_dpm_powergate_vce(adev, !enable);
	else {
		if (adev->pm.funcs->powergate_vce) {
			mutex_lock(&adev->pm.mutex);
			amdgpu_dpm_powergate_vce(adev, !enable);
			mutex_unlock(&adev->pm.mutex);
		} else {
			if (enable) {
				mutex_lock(&adev->pm.mutex);
				adev->pm.dpm.vce_active = true;
				/* XXX select vce level based on ring/task */
				adev->pm.dpm.vce_level = AMDGPU_VCE_LEVEL_AC_ALL;
				mutex_unlock(&adev->pm.mutex);
			} else {
				mutex_lock(&adev->pm.mutex);
				adev->pm.dpm.vce_active = false;
				mutex_unlock(&adev->pm.mutex);
			}
			amdgpu_pm_compute_clocks(adev);
		}
	}
}

void amdgpu_pm_print_power_states(struct amdgpu_device *adev)
{
	int i;

	if (adev->pp_enabled)
		/* TO DO */
		return;

	for (i = 0; i < adev->pm.dpm.num_ps; i++)
		amdgpu_dpm_print_power_state(adev, &adev->pm.dpm.ps[i]);

}

int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
{
	int ret;

	if (adev->pm.sysfs_initialized)
		return 0;

	if (!adev->pp_enabled) {
		if (adev->pm.funcs->get_temperature == NULL)
			return 0;
	}

	adev->pm.int_hwmon_dev = hwmon_device_register_with_groups(adev->dev,
								   DRIVER_NAME, adev,
								   hwmon_groups);
	if (IS_ERR(adev->pm.int_hwmon_dev)) {
		ret = PTR_ERR(adev->pm.int_hwmon_dev);
		dev_err(adev->dev,
			"Unable to register hwmon device: %d\n", ret);
		return ret;
	}

	ret = device_create_file(adev->dev, &dev_attr_power_dpm_state);
	if (ret) {
		DRM_ERROR("failed to create device file for dpm state\n");
		return ret;
	}
	ret = device_create_file(adev->dev, &dev_attr_power_dpm_force_performance_level);
	if (ret) {
		DRM_ERROR("failed to create device file for dpm state\n");
		return ret;
	}

	if (adev->pp_enabled) {
		ret = device_create_file(adev->dev, &dev_attr_pp_num_states);
		if (ret) {
			DRM_ERROR("failed to create device file pp_num_states\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_cur_state);
		if (ret) {
			DRM_ERROR("failed to create device file pp_cur_state\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_force_state);
		if (ret) {
			DRM_ERROR("failed to create device file pp_force_state\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_table);
		if (ret) {
			DRM_ERROR("failed to create device file pp_table\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_dpm_sclk);
		if (ret) {
			DRM_ERROR("failed to create device file pp_dpm_sclk\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_dpm_mclk);
		if (ret) {
			DRM_ERROR("failed to create device file pp_dpm_mclk\n");
			return ret;
		}
		ret = device_create_file(adev->dev, &dev_attr_pp_dpm_pcie);
		if (ret) {
			DRM_ERROR("failed to create device file pp_dpm_pcie\n");
			return ret;
		}
	}
	ret = amdgpu_debugfs_pm_init(adev);
	if (ret) {
		DRM_ERROR("Failed to register debugfs file for dpm!\n");
		return ret;
	}

	adev->pm.sysfs_initialized = true;

	return 0;
}

void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
{
	if (adev->pm.int_hwmon_dev)
		hwmon_device_unregister(adev->pm.int_hwmon_dev);
	device_remove_file(adev->dev, &dev_attr_power_dpm_state);
	device_remove_file(adev->dev, &dev_attr_power_dpm_force_performance_level);
	if (adev->pp_enabled) {
		device_remove_file(adev->dev, &dev_attr_pp_num_states);
		device_remove_file(adev->dev, &dev_attr_pp_cur_state);
		device_remove_file(adev->dev, &dev_attr_pp_force_state);
		device_remove_file(adev->dev, &dev_attr_pp_table);
		device_remove_file(adev->dev, &dev_attr_pp_dpm_sclk);
		device_remove_file(adev->dev, &dev_attr_pp_dpm_mclk);
		device_remove_file(adev->dev, &dev_attr_pp_dpm_pcie);
	}
}

void amdgpu_pm_compute_clocks(struct amdgpu_device *adev)
{
	struct drm_device *ddev = adev->ddev;
	struct drm_crtc *crtc;
	struct amdgpu_crtc *amdgpu_crtc;

	if (!adev->pm.dpm_enabled)
		return;

	if (adev->pp_enabled) {
		int i = 0;

		amdgpu_display_bandwidth_update(adev);
		for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
			struct amdgpu_ring *ring = adev->rings[i];
			if (ring && ring->ready)
				amdgpu_fence_wait_empty(ring);
		}

		amdgpu_dpm_dispatch_task(adev, AMD_PP_EVENT_DISPLAY_CONFIG_CHANGE, NULL, NULL);
	} else {
		mutex_lock(&adev->pm.mutex);
		adev->pm.dpm.new_active_crtcs = 0;
		adev->pm.dpm.new_active_crtc_count = 0;
		if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
			list_for_each_entry(crtc,
					    &ddev->mode_config.crtc_list, head) {
				amdgpu_crtc = to_amdgpu_crtc(crtc);
				if (crtc->enabled) {
					adev->pm.dpm.new_active_crtcs |= (1 << amdgpu_crtc->crtc_id);
					adev->pm.dpm.new_active_crtc_count++;
				}
			}
		}
		/* update battery/ac status */
		if (power_supply_is_system_supplied() > 0)
			adev->pm.dpm.ac_power = true;
		else
			adev->pm.dpm.ac_power = false;

		amdgpu_dpm_change_power_state_locked(adev);

		mutex_unlock(&adev->pm.mutex);
	}
}

/*
 * Debugfs info
 */
#if defined(CONFIG_DEBUG_FS)

static int amdgpu_debugfs_pm_info(struct seq_file *m, void *data)
{
	struct drm_info_node *node = (struct drm_info_node *) m->private;
	struct drm_device *dev = node->minor->dev;
	struct amdgpu_device *adev = dev->dev_private;

	if (!adev->pm.dpm_enabled) {
		seq_printf(m, "dpm not enabled\n");
		return 0;
	}
	if (adev->pp_enabled) {
		amdgpu_dpm_debugfs_print_current_performance_level(adev, m);
	} else {
		mutex_lock(&adev->pm.mutex);
		if (adev->pm.funcs->debugfs_print_current_performance_level)
			amdgpu_dpm_debugfs_print_current_performance_level(adev, m);
		else
			seq_printf(m, "Debugfs support not implemented for this asic\n");
		mutex_unlock(&adev->pm.mutex);
	}

	return 0;
}

static struct drm_info_list amdgpu_pm_info_list[] = {
	{"amdgpu_pm_info", amdgpu_debugfs_pm_info, 0, NULL},
};
#endif

static int amdgpu_debugfs_pm_init(struct amdgpu_device *adev)
{
#if defined(CONFIG_DEBUG_FS)
	return amdgpu_debugfs_add_files(adev, amdgpu_pm_info_list, ARRAY_SIZE(amdgpu_pm_info_list));
#else
	return 0;
#endif
}