This adds what should be a stable interface to read GPU
load from userspace.
(v2): Fix comments and name of file per recommendations.
Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 47 ++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 113edffb5960..49138ac2be24 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -918,6 +918,43 @@ static ssize_t amdgpu_set_pp_power_profile_mode(struct device *dev,
return -EINVAL;
}
+/**
+ * DOC: busy_percent
+ *
+ * The firmware computes a percentage of load based on the activity
+ * level in the IP cores.
+ */
+static ssize_t amdgpu_get_busy_percent(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct drm_device *ddev = dev_get_drvdata(dev);
+ struct amdgpu_device *adev = ddev->dev_private;
+ int r, value, size = sizeof(value);
+
+ /* sanity check PP is enabled */
+ if (!(adev->powerplay.pp_funcs &&
+ adev->powerplay.pp_funcs->read_sensor))
+ return -EINVAL;
+
+ /* read the IP busy sensor */
+ r = amdgpu_dpm_read_sensor(adev, AMDGPU_PP_SENSOR_GPU_LOAD,
+ (void *)&value, &size);
+ if (r)
+ return r;
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", value);
+}
+
+static ssize_t amdgpu_set_busy_percent(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ return -EINVAL;
+}
+
+
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,
@@ -951,6 +988,8 @@ static DEVICE_ATTR(pp_power_profile_mode, S_IRUGO | S_IWUSR,
static DEVICE_ATTR(pp_od_clk_voltage, S_IRUGO | S_IWUSR,
amdgpu_get_pp_od_clk_voltage,
amdgpu_set_pp_od_clk_voltage);
+static DEVICE_ATTR(gpu_busy_percent, S_IRUGO | S_IWUSR,
+ amdgpu_get_busy_percent, amdgpu_set_busy_percent);
static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
struct device_attribute *attr,
@@ -1854,6 +1893,13 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
"pp_od_clk_voltage\n");
return ret;
}
+ ret = device_create_file(adev->dev,
+ &dev_attr_gpu_busy_percent);
+ if (ret) {
+ DRM_ERROR("failed to create device file "
+ "gpu_busy_level\n");
+ return ret;
+ }
ret = amdgpu_debugfs_pm_init(adev);
if (ret) {
DRM_ERROR("Failed to register debugfs file for dpm!\n");
@@ -1889,6 +1935,7 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
&dev_attr_pp_power_profile_mode);
device_remove_file(adev->dev,
&dev_attr_pp_od_clk_voltage);
+ device_remove_file(adev->dev, &dev_attr_gpu_busy_percent);
}
void amdgpu_pm_compute_clocks(struct amdgpu_device *adev)
--
2.14.4
