Commit b374d82d authored by Tom St Denis's avatar Tom St Denis Committed by Alex Deucher
Browse files

drm/amd/amdgpu: Add a GPU_LOAD entry to sysfs (v3) 



This adds what should be a stable interface to read GPU
load from userspace.

(v2): Fix comments and name of file per recommendations.
(v3): Add chapter to amdgpu.rst as well.

Signed-off-by: default avatarTom St Denis <tom.stdenis@amd.com>
Acked-by: default avatarSlava Abramov <slava.abramov@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent a315f232

Documentation/gpu/amdgpu.rst

+5 −0
Original line number Diff line number Diff line
@@ -115,3 +115,8 @@ pp_power_profile_mode 
.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

   :doc: pp_power_profile_mode



busy_percent

~~~~~~~~~~~~



.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

   :doc: busy_percent

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

+40 −0
Original line number Diff line number Diff line
@@ -918,6 +918,36 @@ static ssize_t amdgpu_set_pp_power_profile_mode(struct device *dev, 
	return -EINVAL;

}



/**

 * DOC: busy_percent

 *

 * The amdgpu driver provides a sysfs API for reading how busy the GPU

 * is as a percentage.  The file gpu_busy_percent is used for this.

 * The SMU firmware computes a percentage of load based on the

 * aggregate 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 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 +981,8 @@ 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,

		amdgpu_get_busy_percent, NULL);



static ssize_t amdgpu_hwmon_show_temp(struct device *dev,

				      struct device_attribute *attr,
@@ -1854,6 +1886,13 @@ 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 +1928,7 @@ 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)