drm/amdgpu: Set the default value about gds vmid0 size

For sriov, when first run windows guest, then run linux guest, the gds
vmid0 size will be reset to 0 by windows guest. So if the value has been
reset to 0, then set the value to the default value in linux guest.

v2:
Fixed value instead of reading mmGDS_VMID0_SIZE.

v3:
Set the default value of the switch.
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -4904,7 +4904,20 @@ static void gfx_v9_0_set_rlc_funcs(struct amdgpu_device *adev)
 static void gfx_v9_0_set_gds_init(struct amdgpu_device *adev)
 {
 	/* init asci gds info */
-	adev->gds.mem.total_size = RREG32_SOC15(GC, 0, mmGDS_VMID0_SIZE);
+	switch (adev->asic_type) {
+	case CHIP_VEGA10:
+	case CHIP_VEGA12:
+	case CHIP_VEGA20:
+		adev->gds.mem.total_size = 0x10000;
+		break;
+	case CHIP_RAVEN:
+		adev->gds.mem.total_size = 0x1000;
+		break;
+	default:
+		adev->gds.mem.total_size = 0x10000;
+		break;
+	}
+
 	adev->gds.gws.total_size = 64;
 	adev->gds.oa.total_size = 16;