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

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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: Tom St Denis <tom.stdenis@amd.com>
Acked-by: Slava Abramov <slava.abramov@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tom St Denis 2018-06-20 07:55:39 -04:00 committed by Alex Deucher
parent a315f232f4
commit b374d82dca
2 changed files with 45 additions and 0 deletions
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5
Documentation/gpu/amdgpu.rst
View File

@ -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

40
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
View File

@ -918,6 +918,36 @@ fail:
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)