drm/amd/pm: Add sysfs attribute to get pm metrics

Add sysfs attribute to read power management metrics. A snapshot is
captured to the buffer when the attribute is read.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index ca2ece24e1e07bf97fc4a66e3baf25f0ea5acd13..e1497296afee2716ffb6491569b87312a5c96642 100644 (file)
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -1799,6 +1799,44 @@ static ssize_t amdgpu_set_apu_thermal_cap(struct device *dev,
        return count;
 }
 
+static int amdgpu_pm_metrics_attr_update(struct amdgpu_device *adev,
+                                        struct amdgpu_device_attr *attr,
+                                        uint32_t mask,
+                                        enum amdgpu_device_attr_states *states)
+{
+       if (amdgpu_dpm_get_pm_metrics(adev, NULL, 0) == -EOPNOTSUPP)
+               *states = ATTR_STATE_UNSUPPORTED;
+
+       return 0;
+}
+
+static ssize_t amdgpu_get_pm_metrics(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+       struct drm_device *ddev = dev_get_drvdata(dev);
+       struct amdgpu_device *adev = drm_to_adev(ddev);
+       ssize_t size = 0;
+       int ret;
+
+       if (amdgpu_in_reset(adev))
+               return -EPERM;
+       if (adev->in_suspend && !adev->in_runpm)
+               return -EPERM;
+
+       ret = pm_runtime_get_sync(ddev->dev);
+       if (ret < 0) {
+               pm_runtime_put_autosuspend(ddev->dev);
+               return ret;
+       }
+
+       size = amdgpu_dpm_get_pm_metrics(adev, buf, PAGE_SIZE);
+
+       pm_runtime_mark_last_busy(ddev->dev);
+       pm_runtime_put_autosuspend(ddev->dev);
+
+       return size;
+}
+
 /**
  * DOC: gpu_metrics
  *
@@ -2096,6 +2134,8 @@ static struct amdgpu_device_attr amdgpu_device_attrs[] = {
        AMDGPU_DEVICE_ATTR_RW(smartshift_bias,                          ATTR_FLAG_BASIC,
                              .attr_update = ss_bias_attr_update),
        AMDGPU_DEVICE_ATTR_RW(xgmi_plpd_policy,                         ATTR_FLAG_BASIC),
+       AMDGPU_DEVICE_ATTR_RO(pm_metrics,                               ATTR_FLAG_BASIC,
+                             .attr_update = amdgpu_pm_metrics_attr_update),
 };
 
 static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_attr *attr,