drm/amd/powerplay: add golden dpm table to backup default DPM table (v2)

Backup default DPM table into golden dpm table.

v2: fix dpm_context and golden_dpm_context kfree two times issue.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/inc/amdgpu_smu.h

@@ -201,8 +201,9 @@ struct smu_table_context
 };
 
 struct smu_dpm_context {
-	void *dpm_context;
 	uint32_t dpm_context_size;
+	void *dpm_context;
+	void *golden_dpm_context;
 };
 
 struct smu_power_context {

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -272,7 +272,9 @@ static int smu_v11_0_fini_dpm_context(struct smu_context *smu)
 		return -EINVAL;
 
 	kfree(smu_dpm->dpm_context);
+	kfree(smu_dpm->golden_dpm_context);
 	smu_dpm->dpm_context = NULL;
+	smu_dpm->golden_dpm_context = NULL;
 	smu_dpm->dpm_context_size = 0;
 
 	return 0;

drivers/gpu/drm/amd/powerplay/vega20_ppt.c

@@ -136,11 +136,22 @@ static int vega20_allocate_dpm_context(struct smu_context *smu)
 {
 	struct smu_dpm_context *smu_dpm = &smu->smu_dpm;
 
+	if (smu_dpm->dpm_context)
+		return -EINVAL;
+
 	smu_dpm->dpm_context = kzalloc(sizeof(struct vega20_dpm_table),
 				       GFP_KERNEL);
 	if (!smu_dpm->dpm_context)
 		return -ENOMEM;
 
+	if (smu_dpm->golden_dpm_context)
+		return -EINVAL;
+
+	smu_dpm->golden_dpm_context = kzalloc(sizeof(struct vega20_dpm_table),
+					      GFP_KERNEL);
+	if (!smu_dpm->golden_dpm_context)
+		return -ENOMEM;
+
 	smu_dpm->dpm_context_size = sizeof(struct vega20_dpm_table);
 
 	return 0;
@@ -610,6 +621,9 @@ static int vega20_set_default_dpm_table(struct smu_context *smu)
 	}
 	vega20_init_single_dpm_state(&(single_dpm_table->dpm_state));
 
+	memcpy(smu_dpm->golden_dpm_context, dpm_table,
+	       sizeof(struct vega20_dpm_table));
+
 	return 0;
 }