drm/amd/powerplay: add interface to allocate memory pool (v2)

This patch adds interface to allocate memory pool for smu.
This memory pool will be used for SMC use and msg SetSystemVirtualDramAddr and
DramLogSetDramAddr can notify it changed.

v2: add detailed info to describe this function
Signed-off-by: Huang Rui <ray.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -216,6 +216,21 @@ static int smu_smc_table_hw_init(struct smu_context *smu)
 	return ret;
 }
 
+/**
+ * smu_alloc_memory_pool - allocate memory pool in the system memory
+ *
+ * @smu: amdgpu_device pointer
+ *
+ * This memory pool will be used for SMC use and msg SetSystemVirtualDramAddr
+ * and DramLogSetDramAddr can notify it changed.
+ *
+ * Returns 0 on success, error on failure.
+ */
+static int smu_alloc_memory_pool(struct smu_context *smu)
+{
+	return 0;
+}
+
 static int smu_hw_init(void *handle)
 {
 	int ret;
@@ -243,6 +258,10 @@ static int smu_hw_init(void *handle)
 	if (ret)
 		goto failed;
 
+	ret = smu_alloc_memory_pool(smu);
+	if (ret)
+		goto failed;
+
 	mutex_unlock(&smu->mutex);
 
 	pr_info("SMU is initialized successfully!\n");