drm/amd/pm: add xgmi_plpd_policy sysfs node for user to change plpd policy

Add xgmi_plpd_policy sysfs node for users to check and select xgmi
per-link power down policy:
  - arg 0: disallow plpd
  - arg 1: default policy
  - arg 2: optimized policy

v2: split from smu v13.0.6 code and miscellaneous updates
v3: add usage comments around set/get functions

Signed-off-by: Le Ma <[email protected]>
Reviewed-by: Asad Kamal <[email protected]>
Reviewed-by: Lijo Lazar <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 43 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
index 078aaaa53162..9a157fe4cbc7 100644
--- a/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
+++ b/drivers/gpu/drm/amd/pm/amdgpu_dpm.c
@@ -365,6 +365,49 @@ int amdgpu_dpm_allow_xgmi_power_down(struct amdgpu_device *adev, bool en)
 	return ret;
 }
 
+int amdgpu_dpm_get_xgmi_plpd_mode(struct amdgpu_device *adev, char **mode_desc)
+{
+	struct smu_context *smu = adev->powerplay.pp_handle;
+	int mode = XGMI_PLPD_NONE;
+
+	if (is_support_sw_smu(adev)) {
+		mode = smu->plpd_mode;
+		if (mode_desc == NULL)
+			return mode;
+		switch (smu->plpd_mode) {
+		case XGMI_PLPD_DISALLOW:
+			*mode_desc = "disallow";
+			break;
+		case XGMI_PLPD_DEFAULT:
+			*mode_desc = "default";
+			break;
+		case XGMI_PLPD_OPTIMIZED:
+			*mode_desc = "optimized";
+			break;
+		case XGMI_PLPD_NONE:
+		default:
+			*mode_desc = "none";
+			break;
+		}
+	}
+
+	return mode;
+}
+
+int amdgpu_dpm_set_xgmi_plpd_mode(struct amdgpu_device *adev, int mode)
+{
+	struct smu_context *smu = adev->powerplay.pp_handle;
+	int ret = -EOPNOTSUPP;
+
+	if (is_support_sw_smu(adev)) {
+		mutex_lock(&adev->pm.mutex);
+		ret = smu_set_xgmi_plpd_mode(smu, mode);
+		mutex_unlock(&adev->pm.mutex);
+	}
+
+	return ret;
+}
+
 int amdgpu_dpm_enable_mgpu_fan_boost(struct amdgpu_device *adev)
 {
 	void *pp_handle = adev->powerplay.pp_handle;