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From 59766c824785eb6236991fc9396ca44236d44e75 Mon Sep 17 00:00:00 2001
From: Tom St Denis <tom.stdenis@amd.com>
Date: Wed, 20 Jun 2018 07:55:39 -0400
Subject: [PATCH 4749/5725] 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: 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>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 40 ++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index bc2dd4f9..dbc8300 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -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,
@@ -1853,6 +1885,13 @@ 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");
@@ -1888,6 +1927,7 @@ 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)
--
2.7.4
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