drm/radeon/dpm: add infrastructure to force performance levels
This allows you to force specific power levels within a power
state. Due to hardware restrictions between generations, the
interface is limited to the following 3 selections:
auto: all levels enabled
low: forced to the lowest power level
high: forced to the highest power level
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index aaafb93..2557e8b 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -468,9 +468,57 @@
return count;
}
+static ssize_t radeon_get_dpm_forced_performance_level(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
+ struct radeon_device *rdev = ddev->dev_private;
+ enum radeon_dpm_forced_level level = rdev->pm.dpm.forced_level;
+
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ (level == RADEON_DPM_FORCED_LEVEL_AUTO) ? "auto" :
+ (level == RADEON_DPM_FORCED_LEVEL_LOW) ? "low" : "high");
+}
+
+static ssize_t radeon_set_dpm_forced_performance_level(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
+ struct radeon_device *rdev = ddev->dev_private;
+ enum radeon_dpm_forced_level level;
+ int ret = 0;
+
+ mutex_lock(&rdev->pm.mutex);
+ if (strncmp("low", buf, strlen("low")) == 0) {
+ level = RADEON_DPM_FORCED_LEVEL_LOW;
+ } else if (strncmp("high", buf, strlen("high")) == 0) {
+ level = RADEON_DPM_FORCED_LEVEL_HIGH;
+ } else if (strncmp("auto", buf, strlen("auto")) == 0) {
+ level = RADEON_DPM_FORCED_LEVEL_AUTO;
+ } else {
+ mutex_unlock(&rdev->pm.mutex);
+ count = -EINVAL;
+ goto fail;
+ }
+ if (rdev->asic->dpm.force_performance_level) {
+ ret = radeon_dpm_force_performance_level(rdev, level);
+ if (ret)
+ count = -EINVAL;
+ }
+ mutex_unlock(&rdev->pm.mutex);
+fail:
+ return count;
+}
+
static DEVICE_ATTR(power_profile, S_IRUGO | S_IWUSR, radeon_get_pm_profile, radeon_set_pm_profile);
static DEVICE_ATTR(power_method, S_IRUGO | S_IWUSR, radeon_get_pm_method, radeon_set_pm_method);
static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, radeon_get_dpm_state, radeon_set_dpm_state);
+static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR,
+ radeon_get_dpm_forced_performance_level,
+ radeon_set_dpm_forced_performance_level);
static ssize_t radeon_hwmon_show_temp(struct device *dev,
struct device_attribute *attr,
@@ -1066,6 +1114,9 @@
ret = device_create_file(rdev->dev, &dev_attr_power_dpm_state);
if (ret)
DRM_ERROR("failed to create device file for dpm state\n");
+ ret = device_create_file(rdev->dev, &dev_attr_power_dpm_force_performance_level);
+ if (ret)
+ DRM_ERROR("failed to create device file for dpm state\n");
/* XXX: these are noops for dpm but are here for backwards compat */
ret = device_create_file(rdev->dev, &dev_attr_power_profile);
if (ret)
@@ -1170,6 +1221,7 @@
mutex_unlock(&rdev->pm.mutex);
device_remove_file(rdev->dev, &dev_attr_power_dpm_state);
+ device_remove_file(rdev->dev, &dev_attr_power_dpm_force_performance_level);
/* XXX backwards compat */
device_remove_file(rdev->dev, &dev_attr_power_profile);
device_remove_file(rdev->dev, &dev_attr_power_method);