CONFIG_DRM_TTM (not configurable)

modulename: ttm.ko

configname: CONFIG_DRM_TTM

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Direct Rendering Manager
└─>Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
└─>DRM_TTM
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
GPU memory management subsystem for devices with multiple
GPU memory types. Will be enabled automatically if a device driver
uses it.

source code:
drivers/gpu/drm//ttm/