drm/amd/powerplay: revise reading/writing pptable on Polaris10

Change the way we store pptables in the driver to better
facilitate eventual runtime updates for debugging.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c

@@ -2560,6 +2560,13 @@ int polaris10_reset_asic_tasks(struct pp_hwmgr *hwmgr)
 
 int polaris10_hwmgr_backend_fini(struct pp_hwmgr *hwmgr)
 {
+	struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
+
+	if (data->soft_pp_table) {
+		kfree(data->soft_pp_table);
+		data->soft_pp_table = NULL;
+	}
+
 	return phm_hwmgr_backend_fini(hwmgr);
 }
 
@@ -4750,18 +4757,34 @@ static int polaris10_get_pp_table(struct pp_hwmgr *hwmgr, char **table)
 {
 	struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
 
-	*table = (char *)&data->smc_state_table;
+	if (!data->soft_pp_table) {
+		data->soft_pp_table = kzalloc(hwmgr->soft_pp_table_size, GFP_KERNEL);
+		if (!data->soft_pp_table)
+			return -ENOMEM;
+		memcpy(data->soft_pp_table, hwmgr->soft_pp_table,
+				hwmgr->soft_pp_table_size);
+	}
 
-	return sizeof(struct SMU74_Discrete_DpmTable);
+	*table = (char *)&data->soft_pp_table;
+
+	return hwmgr->soft_pp_table_size;
 }
 
 static int polaris10_set_pp_table(struct pp_hwmgr *hwmgr, const char *buf, size_t size)
 {
 	struct polaris10_hwmgr *data = (struct polaris10_hwmgr *)(hwmgr->backend);
 
-	void *table = (void *)&data->smc_state_table;
+	if (!data->soft_pp_table) {
+		data->soft_pp_table = kzalloc(hwmgr->soft_pp_table_size, GFP_KERNEL);
+		if (!data->soft_pp_table)
+			return -ENOMEM;
+	}
+
+	memcpy(data->soft_pp_table, buf, size);
+
+	hwmgr->soft_pp_table = data->soft_pp_table;
 
-	memcpy(table, buf, size);
+	/* TODO: re-init powerplay to implement modified pptable */
 
 	return 0;
 }

drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.h

@@ -309,6 +309,9 @@ struct polaris10_hwmgr {
 	uint32_t                           up_hyst;
 	uint32_t disable_dpm_mask;
 	bool apply_optimized_settings;
+
+	/* soft pptable for re-uploading into smu */
+	void *soft_pp_table;
 };
 
 /* To convert to Q8.8 format for firmware */