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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>
This commit is contained in:
Alex Deucher 2013-07-02 18:38:02 -04:00
parent 67d5ced503
commit 70d01a5ee2
2 changed files with 62 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/radeon/radeon.h
View File

@ -1335,6 +1335,12 @@ enum radeon_pcie_gen {
RADEON_PCIE_GEN_INVALID = 0xffff
};
enum radeon_dpm_forced_level {
RADEON_DPM_FORCED_LEVEL_AUTO = 0,
RADEON_DPM_FORCED_LEVEL_LOW = 1,
RADEON_DPM_FORCED_LEVEL_HIGH = 2,
};
struct radeon_dpm {
struct radeon_ps *ps;
/* number of valid power states */
@ -1374,6 +1380,8 @@ struct radeon_dpm {
bool uvd_active;
/* thermal handling */
struct radeon_dpm_thermal thermal;
/* forced levels */
enum radeon_dpm_forced_level forced_level;
};
void radeon_dpm_enable_power_state(struct radeon_device *rdev,
@ -1669,6 +1677,7 @@ struct radeon_asic {
u32 (*get_mclk)(struct radeon_device *rdev, bool low);
void (*print_power_state)(struct radeon_device *rdev, struct radeon_ps *ps);
void (*debugfs_print_current_performance_level)(struct radeon_device *rdev, struct seq_file *m);
int (*force_performance_level)(struct radeon_device *rdev, enum radeon_dpm_forced_level level);
} dpm;
/* pageflipping */
struct {
@ -2436,6 +2445,7 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
#define radeon_dpm_get_mclk(rdev, l) rdev->asic->dpm.get_mclk((rdev), (l))
#define radeon_dpm_print_power_state(rdev, ps) rdev->asic->dpm.print_power_state((rdev), (ps))
#define radeon_dpm_debugfs_print_current_performance_level(rdev, m) rdev->asic->dpm.debugfs_print_current_performance_level((rdev), (m))
#define radeon_dpm_force_performance_level(rdev, l) rdev->asic->dpm.force_performance_level((rdev), (l))
/* Common functions */
/* AGP */

52
drivers/gpu/drm/radeon/radeon_pm.c
View File

@ -468,9 +468,57 @@ fail:
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,
@ -1064,6 +1112,9 @@ static int radeon_pm_init_dpm(struct radeon_device *rdev)
if (rdev->pm.num_power_states > 1) {
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 */
@ -1170,6 +1221,7 @@ static void radeon_pm_fini_dpm(struct radeon_device *rdev)
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);