Add sysfs attribute to read power management log. A snapshot is
captured to the buffer when the attribute is read.
Signed-off-by: Lijo Lazar <lijo.lazar@xxxxxxx>
---
v2: Pass PAGE_SIZE as the max size of input buffer
drivers/gpu/drm/amd/pm/amdgpu_pm.c | 40 ++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
index 4c65a2fac028..5a1d21c52672 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
@@ -1794,6 +1794,44 @@ static ssize_t amdgpu_set_apu_thermal_cap(struct device *dev,
return count;
}
+static int amdgpu_pmlog_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_log(adev, NULL, 0) == -EOPNOTSUPP)
+ *states = ATTR_STATE_UNSUPPORTED;
+
+ return 0;
+}
+
+static ssize_t amdgpu_get_pmlog(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_log(adev, buf, PAGE_SIZE);
+
+ pm_runtime_mark_last_busy(ddev->dev);
+ pm_runtime_put_autosuspend(ddev->dev);
+
+ return size;
+}
+
/**
* DOC: gpu_metrics
*
@@ -2091,6 +2129,8 @@ 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(pmlog, ATTR_FLAG_BASIC,
+ .attr_update = amdgpu_pmlog_attr_update),
};
static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_attr *attr,
--
2.25.1
